Tube pump system and method for controlling the tube pump system

The present invention relates to a tube pump system and a control method thereof.

Conventionally, a tube pump has been known in which a flexible tube is intermittently crushed by a plurality of rollers to pump a liquid in the tube. Since the tube pump intermittently pumps the liquid, pulsation (operation in which the flow rate is repeatedly increased or decreased) occurs in the pumped liquid.

As a device for suppressing the pulsation of the liquid pumped by the pump, a damper that suppresses the pulsation of the liquid guided to the liquid chamber by maintaining the pressure balance between the air chamber and the liquid chamber provided inside is known. (See, for example, Patent Document 1).

<p><patcit num="1"><text>Japanese Unexamined Patent Publication No. 2000-205201</text></patcit></p>

<p>By providing the damper disclosed in Patent Document 1 in the flow path on the downstream side of the tube pump, the pulsation of the liquid can be suppressed.</p><p>However, since the damper disclosed in Patent Document 1 has a structure provided with a liquid chamber for accommodating a certain amount of liquid, it has a space (so-called dead volume) in which a liquid that does not flow into the liquid chamber is held. Therefore, germs and the like may be generated in the liquid staying in this space, and the purity of the liquid may not be properly maintained. Further, since the damper disclosed in Patent Document 1 requires a relatively complicated and large volume provided with an air chamber and a liquid chamber, the entire apparatus becomes complicated and large.</p><p>Furthermore, in the tube pump, when the tube crushed by the roller returns to its original shape, a phenomenon occurs in which a liquid is drawn from the flow path on the downstream side to the tube pump side, and this phenomenon causes pulsation. I got the finding. By suppressing or extinguishing this phenomenon, the pulsation of the liquid can be further suppressed.</p><p>The present invention has been made in view of such circumstances, and provides a tube pump system capable of suppressing or extinguishing the pulsation of a liquid without complicating or increasing the size of the apparatus and a control method thereof. The purpose is to do.</p>

<p>In order to solve the above problems, the tube pump of the present invention employs the following means.</p><p>The tube pump system according to one aspect of the present invention includes a housing portion having an inner peripheral surface formed in an arc shape around an axis, a tube arranged along the inner peripheral surface and having flexibility, and the above-mentioned tube pump system. A pair of roller portions that are housed in the accommodating portion and rotate around the axis while the tube is crushed from the contact position around the axis to the separated position, and each of the pair of roller portions is around the axis. The control unit includes a pair of drive units that rotate in the same direction, and a control unit that controls each of the pair of drive units so that the liquid flowing from one end of the tube is discharged from the other end of the tube. Controls each of the pair of drive units so that after one of the pair of roller portions passes through the separation position, the angular velocity of the pair of roller portions toward the other separation position is gradually reduced.</p><p>When one of the pair of rollers passes through the separation position and then the other of the pair of rollers is rotated at a constant angular velocity, the distance from the position where the other of the pair of rollers crushes the tube to the separation position gradually decreases. do. Therefore, as the other of the pair of roller portions approaches the separation position, the pressure of the liquid on the upstream side of the separation position increases, and the flow rate of the liquid discharged from the other end of the tube gradually increases accordingly. Therefore, in the tube pump system according to one aspect of the present invention, after one of the pair of roller portions passes through the separated position, the angular velocity of the pair of roller portions toward the other separated position is gradually reduced. Therefore, it is possible to offset the increase in the pressure of the liquid on the upstream side due to the other of the pair of roller portions approaching the separated position and the decrease in the pressure of the liquid due to the decrease in the angular velocity of the other of the pair of roller portions. Therefore, the fluctuation of the flow rate of the liquid discharged from the other end of the tube can be suppressed or eliminated, and the pulsation of the liquid can be suppressed or eliminated.</p><p>In the tube pump system according to one aspect of the present invention, a pipe having flexibility and maintaining the pressure of the liquid flowing inside at a first predetermined pressure higher than the atmospheric pressure is connected to the other end of the tube. In the control unit, when one of the pair of roller portions passes through the separation position, the pressure of the liquid in the tube blocked by the contact with the pair of roller portions is the first predetermined pressure. Each of the pair of drive units may be controlled so as to rise to a second predetermined pressure having a predetermined pressure difference.</p><p>According to the tube pump system according to this configuration, the static pressure of the liquid inside the pipe is maintained higher than the atmospheric pressure, so if the static pressure of the liquid in the pipe further rises due to the pulsation of the liquid, the pipe Is elastically deformed and the pulsation of the liquid is suppressed.</p><p>Further, in the tube pump according to this configuration, after one of the pair of roller portions passes through the separation position, the liquid inside the tube communicates between the upstream side and the downstream side of the separation position, so that the liquid inside the tube communicates with each other. If there is a difference in the pressure of the liquid on the side and the downstream side, the flow rate of the liquid discharged from the other end of the tube will fluctuate. Therefore, in the tube pump system according to this configuration, when one of the pair of roller portions passes through the separated position, the pressure of the liquid in the tube blocked by the contact with the pair of roller portions is defined as the first predetermined pressure. Raise to the second predetermined pressure of the pressure difference. Therefore, when one of the pair of roller portions passes through the separation position and the tube crushed by the roller portion returns to its original shape, the pressure of the liquid on the downstream side of the separation position and the pressure of the liquid on the upstream side of the separation position are applied. The pressure difference is reduced to a predetermined pressure difference. As a result, when one of the pair of roller portions passes through the separated position, the flow rate of the liquid fluctuates at the separated position and the pulsation of the liquid is suppressed as compared with the case where the pressure difference is larger than the predetermined pressure difference. Will be done.</p><p>In the tube pump system according to one aspect of the present invention, the control unit temporarily adjusts the angular velocity of one of the pair of roller units when one of the pair of roller units releases the crushed state of the tube. It may be increased to.</p><p>By doing so, when one of the pair of roller portions releases the crushed state of the tube, one of the pair of roller portions temporarily discharges the liquid toward the downstream side of the separated position. Can be enhanced to. Therefore, it is possible to prevent the high-pressure liquid on the downstream side of the separation position from being drawn toward the low-pressure fluid on the upstream side of the separation position and causing pulsation of the liquid.</p><p>The tube pump system according to one aspect of the present invention includes a flow meter that measures the flow rate of the liquid discharged from the tube, and the control unit sets the flow rate of the liquid measured by the flow meter as a target flow rate. Each of the pair of drive units may be controlled.</p><p>By doing so, it is possible to control each of the pair of drive units so that the flow rate of the liquid measured by the flow meter becomes the target flow rate while suppressing the occurrence of pulsation of the liquid.</p><p>In the tube pump system according to one aspect of the present invention, the first predetermined pressure may be 20 kPaG or more and 250 kPaG or less.</p><p>By doing so, the first predetermined pressure of the liquid flowing through the pipe becomes sufficiently higher than the atmospheric pressure, and the pulsation of the liquid is suppressed from being transmitted further downstream from the pipe.</p><p>The control method of the tube pump system according to one aspect of the present invention includes an accommodating portion having an inner peripheral surface formed in an arc shape around the axis, and a tube arranged along the inner peripheral surface and having flexibility. A pair of roller portions that are housed in the accommodating portion and rotate around the axis while the tube is crushed from a contact position around the axis to a separated position, and each of the pair of roller portions. A method for controlling a tube pump system including a pair of drive units that rotate in the same direction around the axis, and the pair of drive units so that the liquid flowing from one end of the tube is discharged from the other end of the tube. The control step comprises a control step for controlling each of the above, and the control step gradually reduces the angular velocity of the pair of roller portions toward the other separated position after one of the pair of roller portions has passed through the separated position. Each of the pair of drive units is controlled.</p><p>According to the control method of the tube pump system according to one aspect of the present invention, in order to gradually reduce the angular velocity of the pair of roller portions toward the other separated position after one of the pair of roller portions has passed through the separated position, the pair It is possible to offset the increase in the pressure of the liquid on the upstream side due to the other of the roller portions approaching the separated position and the decrease in the pressure of the liquid due to the decrease in the angular velocity of the other of the pair of roller portions. Therefore, the fluctuation of the flow rate of the liquid discharged from the other end of the tube can be suppressed or eliminated, and the pulsation of the liquid can be suppressed or eliminated.</p><p>In the control method of the tube pump system according to one aspect of the present invention, a pipe having flexibility and maintaining the pressure of the liquid flowing inside at a first predetermined pressure higher than the atmospheric pressure is provided at the other end of the tube. In the control step, when one of the pair of roller portions passes through the separation position, the pressure of the liquid in the tube blocked by the contact with the pair of roller portions is the first. 1 Each of the pair of drive units may be controlled so as to rise to a second predetermined pressure of a predetermined pressure and a predetermined pressure difference.</p><p>According to the control method of the tube pump system according to this configuration, the static pressure of the liquid inside the pipe is maintained higher than the atmospheric pressure, so that when the static pressure of the liquid in the pipe further rises due to the pulsation of the liquid. The piping is elastically deformed and the pulsation of the liquid is suppressed.</p><p>Further, according to the control method of the tube pump system according to the present configuration, when one of the pair of roller portions passes through the separated position, the pressure of the liquid in the tube blocked by the contact with the pair of roller portions is the highest. 1 The pressure rises to the second predetermined pressure, which is the difference between the predetermined pressure and the predetermined pressure. Therefore, when one of the pair of roller portions passes through the separation position and the tube crushed by the roller portion returns to its original shape, the pressure of the liquid on the downstream side of the separation position and the pressure of the liquid on the upstream side of the separation position are applied. The pressure difference is reduced to a predetermined pressure difference. As a result, when one of the pair of roller portions passes through the separated position, the flow rate of the liquid fluctuates at the separated position and the pulsation of the liquid is suppressed as compared with the case where the pressure difference is larger than the predetermined pressure difference. Will be done.</p><p>In the control method of the tube pump system according to one aspect of the present invention, in the control step, when one of the pair of roller portions releases the crushed state of the tube, the angular velocity of one of the pair of roller portions is released. May be temporarily increased.</p><p>By doing so, when one of the pair of roller portions releases the crushed state of the tube, one of the pair of roller portions temporarily discharges the liquid toward the downstream side of the separated position. Can be enhanced to. Therefore, it is possible to prevent the high-pressure liquid on the downstream side of the separation position from being drawn toward the low-pressure fluid on the upstream side of the separation position and causing pulsation of the liquid.</p><p>In the control method of the tube pump system according to one aspect of the present invention, a measurement step of measuring the flow rate of the liquid flowing inside the pipe is provided, and in the control step, the flow rate of the liquid measured by the measurement step is the target flow rate. Each of the pair of drive units may be controlled so as to be.</p><p>By doing so, it is possible to control each of the pair of drive units so that the flow rate of the liquid measured by the flow meter becomes the target flow rate while suppressing the occurrence of pulsation of the liquid.</p><p>In the control method of the tube pump system according to one aspect of the present invention, the first predetermined pressure may be 20 kPaG or more and 250 kPaG or less.</p><p>By doing so, the first predetermined pressure of the liquid flowing through the pipe becomes sufficiently higher than the atmospheric pressure, and the pulsation of the liquid is suppressed from being transmitted further downstream from the pipe.</p>

<p>An object of the present invention is to provide a tube pump system and a control method thereof capable of suppressing or extinguishing the pulsation of a liquid without complicating or increasing the size of the device.</p>

<figref num="1">It is a block diagram which shows the flow rate control apparatus which concerns on one Embodiment of this invention.</figref><figref num="2">It is a front view of the tube pump shown in FIG.</figref><figref num="3">FIG. 2 is a vertical cross-sectional view taken along the line II of the tube pump shown in FIG.</figref><figref num="4">It is an exploded perspective view of the tube pump shown in FIG.</figref><figref num="5">FIG. 3 is a vertical cross-sectional view showing a structure in which the first driving portion shown in FIG. 3 transmits a driving force to the first roller portion.</figref><figref num="6">It is a vertical cross-sectional view which shows the structure which the 2nd drive part shown in FIG. 3 transmits a driving force to a 2nd roller part.</figref><figref num="7">It is a top view which shows the tube pump in the state which the tube is closed.</figref><figref num="8">It is a top view which shows the tube pump in the state where a tube starts to open.</figref><figref num="9">It is a top view which shows the tube pump with the tube open.</figref><figref num="10">It is a figure which shows the tube pump in the state which the 2nd roller part reached the separated position.</figref><figref num="11">It is a partially enlarged view of the tube pump shown in FIG. 7.</figref><figref num="12">It is a partially enlarged view of the tube pump shown in FIG.</figref><figref num="13">It is a partially enlarged view of the tube pump shown in FIG.</figref><figref num="14">It is a partially enlarged view of the tube pump shown in FIG.</figref><figref num="15">FIG. 11 is a cross-sectional view taken along the line II-II of the tube shown in FIG.</figref><figref num="16">FIG. 12 is a cross-sectional view taken along the line III-III of the tube shown in FIG.</figref><figref num="17">FIG. 6 is a cross-sectional view taken along the line IV-IV of the tube shown in FIG.</figref><figref num="18">It is a VV arrow cross-sectional view of the tube shown in FIG.</figref><figref num="19">It is a graph which shows the angular velocity of the 1st roller part and the 2nd roller part with respect to the rotation angle of the 1st roller part.</figref><figref num="20">It is a graph which shows the comparative example of the angular velocity of the 1st roller part and the 2nd roller part with respect to the rotation angle of the 1st roller part.</figref><figref num="21">It is a graph which shows the flow rate of the liquid measured by the flow meter of the tube pump system of this embodiment.</figref><figref num="22">It is a graph which shows the flow rate of the liquid measured by the flow meter of a tube pump system.</figref>

Hereinafter, an embodiment of the tube pump system and the control method thereof according to the present invention will be described with reference to the drawings.

Hereinafter, the tube pump system 700 according to the embodiment of the present invention will be described with reference to the drawings.

The tube pump system 700 of the present embodiment is a device that pumps liquid from the inflow end 701 to the outflow end 702 and controls the flow rate of the liquid pumped by the tube pump 100.

As shown in FIG. 1, in the tube pump system 700 of the present embodiment, the tube pump 100 that pumps the liquid, the pipe 200 that conveys the liquid from the tube pump 100 to the needle valve 500, and the pressure of the liquid flowing through the pipe 200. A pressure sensor 300 that detects the pressure of the liquid, a flow meter 400 that measures the flow rate of the liquid flowing through the pipe 200, a needle valve 500 that adjusts the pressure of the liquid flowing through the pipe 200 located on the upstream side, and a tube pump 100. A control unit 600 for controlling the discharge amount of the discharged liquid is provided.

Hereinafter, each configuration included in the tube pump system 700 of the present embodiment will be described.

The tube pump 100 is a device that pumps a liquid from the inflow end 701 to the outflow end 702. The tube pump 100 pumps a liquid by repeating an operation of moving a roller in a state where a flexible tube is crushed by a roller. The liquid discharged from the tube pump 100 to the pipe 200 passes through the flow meter 400 and the needle valve 500 and reaches the outflow end 702.

Details of the tube pump 100 will be described later.

The pipe 200 is a pipe for transporting a liquid from the tube pump 100 to the needle valve 500. The pipe 200 is formed of a flexible resin material (for example, silicone resin) that is elastically deformed by the pressure of the liquid pumped by the tube pump 100. By adjusting the opening degree of the needle valve 500, which will be described later, the pipe 200 can maintain the pressure of the liquid flowing inside at the first predetermined pressure Pr1 which is higher than the atmospheric pressure.

It is desirable that the flow path length L of the pipe 200 is, for example, about 1000 mm.

The pressure sensor 300 is a device that detects the pressure of the liquid flowing inside the pipe 200. The pressure sensor 300 is arranged on the upstream side of the flow meter 400 in the pipe 200 for guiding the liquid from the tube pump 100 to the needle valve 500. The pressure sensor 300 transmits the detected pressure to the control unit 600.

The flow meter 400 is a device that measures the flow rate of the liquid flowing inside the pipe 200. The flow meter 400 is arranged on the downstream side of the pressure sensor 300 in the pipe 200 for guiding the liquid from the tube pump 100 to the needle valve 500. The flow meter 400 transmits the measured flow rate to the control unit 600.

The needle valve 500 is a device that adjusts the flow rate of the fluid flowing from the pipe 200 to the outflow end 702 by adjusting the insertion amount of the needle-shaped valve body (not shown) into the valve hole (not shown). .. The needle valve 500 forms a region in the flow path that guides the liquid from the tube pump 100 to the outflow end 702, where the flow path cross section is the smallest.

The reason why the flow path cross section of the needle valve 500 is minimized is that the piping resistance of the needle valve 500 is the highest in the flow path for guiding the liquid from the tube pump 100 to the outflow end 702. Therefore, the static pressure of the liquid in the pipe 200 on the upstream side of the needle valve 500 is maintained in a high state. In the present embodiment, the opening degree of the needle valve 500 is adjusted so that the pressure of the liquid flowing inside the pipe 200 becomes the first predetermined pressure Pr1 higher than the atmospheric pressure.

Here, it is desirable that the first predetermined pressure Pr1 is set to any value in the range of 20 kPaG or more and 250 kPaG or less. In particular, it is desirable to set it to any value in the range of 90 kPaG or more and 110 kPaG or less. Here, G means gauge pressure.

The reason why the pipe 200, which maintains the static pressure of the liquid inside the pipe 200, is made of a flexible resin material is that it elastically deforms when the static pressure inside the pipe 200 is further increased by the pulsation of the liquid. This is to suppress the transmission of the pulsation of the liquid to the downstream side.

In this way, by arranging the pipe 200 formed of the flexible resin material on the upstream side of the needle valve 500 having the highest pipe resistance in the flow path for guiding the liquid from the tube pump 100 to the outflow end 702, the tube pump The pulsation of the liquid pumped from 100 can be suppressed.

The control unit 600 controls each of the first drive unit 50 and the second drive unit 60, which will be described later, so that the liquid flowing from one end of the flexible tube 101 included in the tube pump 100 is discharged from the other end of the tube 101. It is a device.

The control unit 600 controls each of the first drive unit 50 and the second drive unit 60 so that the pressure transmitted from the pressure sensor 300 matches the first predetermined pressure Pr1. Further, the control unit 600 controls each of the first drive unit 50 and the second drive unit 60 so that the flow rate measured by the flow meter 400 becomes a predetermined target flow rate. The detailed control method of the first drive unit 50 and the second drive unit 60 by the control unit 600 will be described later.

Next, the tube pump 100 included in the tube pump system 700 will be described.

In the tube pump 100 of the present embodiment shown in FIG. 2, the first roller portion 10 (first contact member) and the second roller portion 20 (second contact member) are aligned in the same direction around the axis X1 (first axis). It is a device that discharges the fluid in the tube 101 flowing in from the inflow side end 101a to the outflow side end 101b by rotating. A pipe 200 is connected to the outflow side end 101b.

Note that FIG. 2 shows the tube pump 100 with the cover 83 shown in FIG. 3 removed.

As shown in the front view of FIG. 2, the tube pump 100 has an axis X1 along the inner peripheral surface 82b of the recess 82a of the roller accommodating portion 82 accommodating the first roller portion 10 and the second roller portion 20. The tube 101 is arranged in an arc shape. As shown in FIG. 2, the first roller portion 10 and the second roller portion 20 housed in the roller accommodating portion 82 rotate counterclockwise while in contact with the tube 101 (direction indicated by an arrow in FIG. 2). Rotate around the axis X1 along.

In the front view of FIG. 2, the contact position Po1 indicates a position around the axis X1 in which the first roller portion 10 and the second roller portion 20 switch from the state of being separated from the tube 101 to the state of being in contact with the tube 101. Further, the separation position Po2 indicates a position around the axis X1 in which the first roller portion 10 and the second roller portion 20 switch from the state of being in contact with the tube 101 to the state of being separated from the tube 101. The broken line shown in FIG. 2 indicates the first roller portion 10 and the second roller portion 20 arranged at the contact position Po1 and the separation position Po2.

The first roller portion 10 and the second roller portion 20 rotate independently around the axis X1 in a state where the tube 101 is crushed between the inner peripheral surface 82b and the tube 101 from the contact position Po1 to the separation position Po2. ..

As shown in the vertical sectional view of FIG. 3 and the exploded perspective view of FIG. 4, the tube pump 100 of the present embodiment has the first roller portion 10 and the second roller portion 20 that rotate around the axis X1 while being in contact with the tube 101. The drive shaft 30 (shaft member) arranged on the axis X1 and connected to the first roller portion 10, the drive cylinder (cylinder member) 40 connected to the second roller portion 20, and the drive shaft 30. It includes a first drive unit 50 that transmits the driving force, a second drive unit 60, and a transmission mechanism 70 (transmission unit) that transmits the drive force of the second drive unit 60 to the drive cylinder 40.

The first roller portion 10 is a first roller support that is connected to a first roller 11 that rotates around an axis parallel to the axis X1 while in contact with the tube 101 and a drive shaft 30 that rotates integrally around the axis X1. It has a member 12 and a first roller shaft 13 whose both ends are supported by the first roller support member 12 and to which the first roller 11 is rotatably attached.

The second roller portion 20 is connected to a second roller 21 that rotates around an axis parallel to the axis X1 while in contact with the tube 101, and a second roller support that is connected to a drive cylinder 40 so as to rotate integrally around the axis X1. It has a member 22 and a second roller shaft 23 whose both ends are supported by the second roller support member 22 and to which the second roller 21 is rotatably attached.

As shown in FIG. 3, the first drive unit 50 and the second drive unit 60 are housed inside the casing (accommodating member) 80. Inside the casing 80, a gear accommodating portion 81 for accommodating the transmission mechanism 70 and a support member 90 for supporting the first drive portion 50 and the second drive portion 60 are attached. Further, a roller accommodating portion 82 for accommodating the first roller portion 10 and the second roller portion 20 is attached to the upper portion of the casing 80.

The roller accommodating portion 82 has a recess 82a accommodating the first roller portion 10 and the second roller portion 20. The recess 82a is provided with an inner peripheral surface 82b formed in an arc shape around the axis X1.

As shown in FIG. 3, the tube 101 is arranged in an arc shape around the axis X1 along the inner peripheral surface 82b.

The support member 90 is formed with a first through hole 91 extending along the axis X1 and a second through hole 92 extending along the axis X2. The first drive unit 50 is attached to the support member 90 by a fastening bolt (not shown) with the first drive shaft 51 inserted in the first through hole 91 formed in the support member 90. Similarly, the second drive unit 60 is attached to the support member 90 by a fastening bolt (not shown) with the second drive shaft 61 inserted in the second through hole 92 formed in the support member 90. In this way, each of the first drive unit 50 and the second drive unit 60 is attached to the support member 90, which is an integrally formed member.

Here, a structure in which the first driving unit 50 transmits the driving force to the first roller unit 10 will be described with reference to FIG. In FIG. 5, the portion shown by the solid line is a portion constituting the structure for transmitting the driving force of the first driving unit 50 to the first roller unit 10.

As shown in FIG. 5, the first drive unit 50 has a first drive shaft 51 arranged on the axis X1 and connected to the drive shaft 30. The first drive shaft 51 is attached to the lower end of the drive shaft 30 with a pin 51a extending in a direction orthogonal to the axis X1 inserted. The drive shaft 30 is fixed by the pin 51a so as not to rotate relative to the first drive shaft 51 about the axis X1. Therefore, when the first drive unit 50 rotates the first drive shaft 51 around the axis X1, the driving force of the first drive shaft 51 is transmitted to the drive shaft 30, and the drive shaft 30 rotates around the axis X1.

The first drive unit 50 decelerates the rotation of the first drive shaft 51, the first electric motor 52, and the rotation shaft (not shown) rotated by the first electric motor 52, and transmits the rotation to the first drive shaft 51. It has one speed reducer 53 and. The first drive unit 50 rotates the first drive shaft 51 around the axis X1 by transmitting the drive force of the first electric motor 52 to the first drive shaft 51.

A position detecting member 51b that rotates around the axis X1 together with the first drive shaft 51 is attached to the first drive shaft 51. In the position detection member 51b, a slit (not shown) for detecting the rotational position of the first roller portion 10 around the axis X1 is formed in the outer peripheral edge portion formed in an annular shape in the circumferential direction around the axis X1. There is.

As shown in FIG. 5, the position detection sensor 54 is arranged so as to sandwich the upper surface and the lower surface of the outer peripheral edge portion of the position detection member 51b. The position detection sensor 54 is a sensor in which a light emitting element is arranged on one of the upper surface side and the lower surface side and a light receiving element is arranged on the other of the upper surface side and the lower surface side. The position detection sensor 54 detects with the light receiving element that the light emitted by the light emitting element passes through the slit as the position detection member 51b rotates around the axis X1, so that the first roller portion 10 rotates around the axis X1. It detects the rotation position indicating which position of the throat is located and transmits it to the control unit 600.

The lower end of the drive shaft 30 is connected to the first drive shaft 51, and the upper end thereof is inserted into an insertion hole formed in the cover 83. A third bearing member 33 that rotatably supports the tip of the first drive shaft 51 around the axis X1 is inserted in the insertion hole of the cover 83.

Further, the drive shaft 30 is formed by a cylindrical first bearing member 31 inserted along the outer peripheral surface and a cylindrical second bearing member 32 formed independently of the first bearing member 31. It is rotatably supported around the axis X1 on the inner peripheral side of 40.

As described above, in the drive shaft 30, the outer peripheral surface on the lower end side is supported by the first bearing member 31, the outer peripheral surface in the central portion is supported by the second bearing member 32, and the outer peripheral surface on the distal end side is the third bearing member 33. Is supported by. Therefore, the drive shaft 30 smoothly rotates around the axis X1 while the central axis is held on the axis X1.

Here, as shown in FIG. 4, the first bearing member 31 and the second bearing member 32 are arranged in a state of being separated from each other in the axis X1 direction so as to extend around the axis X1 on the inner peripheral surface of the drive cylinder 40. This is because the endless annular protrusion 40a is formed.

The first roller support member 12 of the first roller portion 10 is connected to the tip end side of the drive shaft 30 so as to rotate integrally around the axis X1.

As described above, the driving force for the first drive unit 50 to rotate the first drive shaft 51 around the axis X1 is transmitted from the first drive shaft 51 to the first roller unit 10 via the drive shaft 30.

As shown in FIG. 5, the lower end of the drive shaft 30 is supported by the upper surface of the thrust bearing 35 formed in an annular shape, and the lower surface of the thrust bearing 35 is supported by the support member 90. Therefore, when a thrust force directed downward along the axis X1 is applied to the drive shaft 30, the thrust force is not transmitted to the first speed reducer 53 and the first electric motor 52, and the thrust bearing 35 does not transmit the thrust force. Be supported.

Therefore, when a thrust force directed downward along the axis X1 is applied to the drive shaft 30, the thrust force suppresses the impact on the first speed reducer 53 and the first electric motor 52.

Next, a structure in which the second driving unit 60 transmits the driving force to the first roller unit 10 will be described with reference to FIG. In FIG. 6, the portion shown by the solid line is a portion constituting the structure for transmitting the driving force of the second driving unit 60 to the second roller unit 20. The structure shown in FIG. 6 includes a second roller unit 20, a drive cylinder 40, a second drive unit 60, and a transmission mechanism 70.

In the transmission mechanism 70 shown in FIG. 6, the driving force of the first gear portion 71 rotating around the axis X2 (second axis) parallel to the axis X1 and the driving force of the second drive shaft 61 are transmitted from the first gear portion 71. It has a second gear portion 72. The transmission mechanism 70 transmits the driving force around the axis X2 of the second drive shaft 61 to the outer peripheral surface of the drive cylinder 40 to rotate the drive cylinder 40 around the axis X1.

As shown in FIG. 6, the second drive unit 60 includes a second drive shaft 61 arranged on the axis X2, a second electric motor 62, and a rotation shaft (not shown) rotated by the second electric motor 62. It has a second speed reducer 63 that slows down the rotation and transmits it to the second drive shaft 61. The second drive unit 60 rotates the second drive shaft 61 around the axis X2 by transmitting the drive force of the second electric motor 62 to the second drive shaft 61.

The second drive shaft 61 is inserted into an insertion hole formed in the center of the first gear portion 71 formed in a cylindrical shape around the axis X2. The first gear portion 71 is fixed to the second drive shaft 61 by fastening the fixing screw 71a with the second drive shaft 61 inserted and abutting the tip of the fixing screw 71a against the second drive shaft 61. To. In this way, the first gear portion 71 is connected to the second drive shaft 61 and rotates around the axis X2 together with the second drive shaft 61.

The first gear 71b formed around the axis X2 of the first gear portion 71 is engaged with the second gear 72b formed around the axis X1 of the second gear portion 72. Therefore, the driving force due to the rotation of the first gear portion 71 around the axis X2 is transmitted as the driving force for rotating the second gear portion 72 around the axis X1.

The first gear portion 71 is formed with a position detecting member 71c that rotates around the axis X1 together with the second drive shaft 61. The position detection member 71c has a slit (not shown) formed on the outer peripheral edge formed in an annular shape to detect the rotational position of the second roller portion 20 around the axis X1 in the circumferential direction around the axis X2. There is.

As shown in FIG. 6, the position detection sensor 64 is arranged so as to sandwich the upper surface and the lower surface of the outer peripheral edge portion of the position detection member 71c. The position detection sensor 64 is a sensor in which a light emitting element is arranged on one of the upper surface side and the lower surface side and a light receiving element is arranged on the other of the upper surface side and the lower surface side. In the position detection sensor 64, the second roller portion 20 rotates around the axis X1 by detecting with the light receiving element that the light emitted by the light emitting element passes through the slit as the position detection member 71c rotates around the axis X2. It detects the rotation position indicating which position of the throat is located and transmits it to the control unit 600.

The drive cylinder 40 is inserted into an insertion hole formed in the center of the second gear portion 72 formed in a cylindrical shape around the axis X1. The insertion hole is a hole having an inner peripheral surface connected to the outer peripheral surface of the drive cylinder 40.

The second gear portion 72 is fixed to the drive cylinder 40 by fastening the fixing screw 72a with the drive cylinder 40 inserted and abutting the tip of the fixing screw 72a against the drive cylinder 40. In this way, the second gear portion 72 is connected to the drive cylinder 40 and rotates around the axis X1 together with the drive cylinder 40.

As shown in FIG. 6, the drive cylinder 40 is arranged with the first bearing member 31 and the second bearing member 32 sandwiched on the outer peripheral side of the drive shaft 30. Therefore, the drive cylinder 40 can rotate around the axis X1 independently of the drive shaft 30. The drive shaft 30 rotates around the axis X1 by the driving force of the first drive unit 50, and the drive cylinder 40 rotates around the axis X1 by the drive force of the second drive unit 60 in a state independent of the drive shaft 30.

The second roller support member 22 of the second roller portion 20 is connected to the tip end side of the drive cylinder 40 so as to rotate integrally around the axis X1.

As described above, the driving force for the second drive unit 60 to rotate the second drive shaft 61 around the axis X2 is transmitted to the outer peripheral surface of the drive cylinder 40 by the transmission mechanism 70, and is transmitted from the drive cylinder 40 to the second roller unit 20. Is transmitted to.

Next, the liquid discharge executed by the tube pump system 700 of the present embodiment will be described with reference to the drawings.

As shown in FIG. 1, the tube pump system 700 of the present embodiment detects the pressure of the liquid discharged from the tube pump 100 to the pipe 200 by the pressure sensor 300 and transmits it to the control unit 600. Further, the tube pump system 700 measures the flow rate of the liquid flowing through the pipe 200 with a flow meter and transmits it to the control unit 600. The control unit 600 controls the angular velocity around the axis X1 of the first roller unit 10 and the second roller unit 20 so that the flow rate of the liquid flowing through the pipe 200 matches the target flow rate. Further, the operator of the tube pump system 700 adjusts the opening degree of the needle valve 500 so that the pressure detected by the pressure sensor 300 matches the first predetermined pressure Pr1.

The tube pump system 700 shown in FIG. 1 transmits a control signal for controlling the first drive unit 50 and the second drive unit 60 of the tube pump 100 from the control unit 600 to the tube pump 100.

The tube pump 100 may be configured as a device in which the control unit 600 is incorporated. In this case, the control unit 600 incorporated inside the tube pump 100 generates a control signal for controlling the first drive unit 50 and the second drive unit 60, and sends the control signal to the first drive unit 50 and the second drive unit 60. introduce.

In the example shown in FIGS. 7 to 18, a liquid without pulsation (a liquid without fluctuation of the flow rate) flows in from the inflow side end 101a of the tube 101 and flows out without pulsation. This is an example of discharging from the side end portion 101b.

FIG. 7-10 is a plan view showing the tube pump 100, and shows how the second roller portion 20 approaches the separation position Po2 in chronological order. 11-14 are partially enlarged views of the vicinity of the second roller 21 of the tube pump 100 shown in FIGS. 7-10, respectively. 15-18 are vertical cross-sectional views of the tubes 101 shown in FIGS. 11-14, respectively.

FIG. 7 is a plan view showing the tube pump 100 with the tube 101 closed. The state in which the tube 101 is closed means a state in which the second roller 21 of the second roller portion 20 crushes the tube 101 as shown in FIGS. 11 and 15. At this point, the cross-sectional area of the flow path of the tube 101 shown in FIG. 15 becomes 0.

FIG. 8 is a plan view showing the tube pump 100 in a state where the tube 101 starts to open. The state in which the tube 101 starts to open means a state in which the second roller 21 of the second roller portion 20 starts to release the crushed state of the tube 101 as shown in FIGS. 12 and 16. At this point, the cross-sectional area of the flow path of the tube 101 shown in FIG. 16 is a value larger than 0.

FIG. 9 is a plan view showing the tube pump 100 with the tube 101 open. The state in which the tube 101 is open means a state in which the state in which the second roller 21 of the second roller portion 20 crushes the tube 101 is released as shown in FIGS. 13 and 17. At this point, the cross-sectional area of the flow path of the tube 101 shown in FIG. 17 is the same as the cross-sectional area of the flow path in the state where the second roller 21 does not contact.

FIG. 10 is a plan view showing the tube pump 100 in a state where the second roller portion 20 reaches the separation position Po2. The state in which the second roller portion 20 reaches the separation position Po2 means a state in which the deformation of the tube 101 by the second roller portion 20 is released as shown in FIGS. 14 and 18. At this point, the flow path cross section of the tube 101 shown in FIG. 18 is the same as the flow path cross section of the tube 101 shown in FIG. This means that after the second roller portion 20 reaches the position shown in FIG. 9, the deformation of the tube 101 is gradually released, but the cross-sectional area of the flow path of the tube 101 does not change.

FIG. 19 is a graph showing the angular velocities (rad / s) of the first roller portion 10 and the second roller portion 20 with respect to the rotation angle Ra (°) of the first roller portion 10. Here, the rotation angle Ra of the first roller portion 10 means an angle around the axis X1 with each position shown in FIG. 7 as 0 °, 90 °, 180 °, and 270 °.

The control unit 600 shown in FIG. 1 is first driven so that when the second roller unit 20 passes through the separation position Po2, the first roller unit 10 and the second roller unit 20 rotate at the angular velocity shown in FIG. A control signal for controlling the unit 50 and the second drive unit 60 is transmitted to the tube pump 100.

Next, with reference to FIG. 19, a method of controlling the tube pump 100 by the control unit 600 when the second roller unit 20 passes through the separation position Po2 will be described. In the following, the control method of the first roller unit 10 will be described, but since the control method of the second roller unit 20 is also the same, the duplicate description below will be omitted.

As shown in FIG. 7, the separation position Po2 exists in the range where the rotation angle Ra around the axis X1 is larger than 270 ° and smaller than 360 ° (0 °). In the following, the operation performed by the tube pump 100 from the rotation angle of 0 ° to 360 ° will be described.

As shown in FIG. 7, the rotation angle Ra1 corresponds to a state in which the tube 101 is closed due to contact with the second roller portion 20. Further, the rotation angle Ra2 corresponds to a state in which the tube 101 in contact with the second roller portion 20 starts to open, as shown in FIG. Further, the rotation angle Ra3 corresponds to the state in which the tube 101 is opened, as shown in FIG. Further, as shown in FIG. 10, the rotation angle Ra4 corresponds to a state in which the second roller portion 20 reaches the separation position Po2.

The rotation angle Ra5 corresponds to a state in which the tube 101 is closed due to contact with the first roller portion 10. Further, the rotation angle Ra6 corresponds to a state in which the tube 101 in contact with the first roller portion 10 starts to open. Further, the rotation angle Ra7 corresponds to the state in which the tube 101 is open. Further, the rotation angle Ra8 corresponds to a state in which the first roller portion 10 reaches the separation position Po2.

The control unit 600 keeps the first roller unit 10 at the angular velocity V1 from the rotation angle 0 ° to the rotation angle Ra1, and increases the first roller unit 10 from the angular velocity V1 to the angular velocity V4 at the rotation angle Ra1. Here, the angular velocity V4 can be any angular velocity larger than the angular velocity V1 so that the flow rate measured by the flow meter 400 does not fluctuate (pulsation) according to the characteristics of each part of the tube pump 100. For example, the control unit 600 sets the angular velocity V4 to be proportional to the first predetermined pressure Pr1 detected by the pressure sensor 300. Thereby, the pressure of the liquid blocked inside the tube 101 can be matched with the first predetermined pressure Pr1 of the liquid of the pipe 200.

Further, for example, the control unit 600 sets the angular velocity V4 to be constant without being proportional to the first predetermined pressure Pr1, and sets the range of the rotation angle from the rotation angle Ra1 to the rotation angle Ra3 to be proportional to the first predetermined pressure Pr1. You may. In this case, the rotation angle Ra3 may be increased without changing the rotation angle Ra1, or the rotation angle Ra1 may be decreased without changing the rotation angle Ra3. Further, the rotation angle Ra1 may be decreased and the rotation angle Ra3 may be increased. Thereby, the pressure of the liquid blocked inside the tube 101 can be matched with the first predetermined pressure Pr1 of the liquid of the pipe 200.

The reason why the control unit 600 increases the angular velocity of the first roller unit 10 from the rotation angle Ra1 is to reduce the angle difference around the axis X1 between the first roller unit 10 and the second roller unit 20.

As shown in FIGS. 7 and 8, at the rotation angles Ra1 and Ra2, a part of the tube 101 is crushed and closed by contact with the first roller portion 10 and the second roller portion 20. There is. Therefore, when the angle difference between the first roller portion 10 and the second roller portion 20 around the axis X1 decreases, the internal volume of the closed tube 101 decreases, and the pressure of the liquid existing inside increases.

In the control unit 600, the pressure difference between the liquid pressure in the tube 101 and the first predetermined pressure Pr1 which is the pressure of the liquid in the pipe 200 at the rotation angle Ra2 at which the tube 101 starts to open becomes the predetermined pressure difference. 2 The first drive unit 50 and the second drive unit 60 are controlled so as to rise to the predetermined pressure Pr2.

Here, it is desirable that the predetermined pressure difference is within 0.2 times the first predetermined pressure Pr1. That is, it is desirable that the second predetermined pressure Pr2 satisfies the following conditional expression (1).

0.8 Pr1 Pr2 1.2 Pr1 (1)

The control unit 600 raises the pressure of the liquid in the tube 101 so that the second predetermined pressure Pr2 satisfies the conditional expression (1). As a result, when the tube 101 starts to open, the pressure difference between the liquids on the upstream side and the liquid on the downstream side at the position where the tube 101 starts to open becomes small. Therefore, it is possible to suppress a problem that liquid flows in and out between the upstream side and the downstream side of the position where the tube 101 starts to open, which causes pulsation.

The control unit 600 maintains the angular velocity V4 until the rotation angle Ra3 is reached even after the angular velocity of the first roller unit 10 passes through the rotation angle Ra2 in which the tube 101 starts to open. This is because the cross-sectional area of the flow path of the tube 101 increases until the rotation angle Ra3, in which the tube 101 is open even after passing through the rotation angle Ra2, is reached. The control unit 600 has an angular velocity of the second roller unit 20 so that liquid does not flow in and out between the upstream side and the downstream side of the position where the tube 101 opens when the cross-sectional area of the flow path of the tube 101 increases. The angular velocity of the first roller portion 10 is maintained at a higher speed than that of the first roller portion 10.

The control unit 600 decelerates the first roller unit 10 from the angular velocity V4 to the angular velocity V2 after passing through the rotation angle Ra3 in which the tube 101 is in the open state. As shown in FIG. 19, the angular velocity V2 is higher than the angular velocity V1.

In the example shown in FIG. 19, the angular velocity of the first roller portion 10 is gradually decreased from the angular velocity V4 to the angular velocity V2 with a constant gradient, but other embodiments may be used. For example, when the first roller section 10 and the second roller section 20 are rotated at a constant speed around the axis X1, the waveform of the time-series change in the flow rate measured by the flow meter 400 is measured in advance, and the time-series change in the flow rate is changed. The angular velocity may be reduced from the angular velocity V4 to the angular velocity V2 so that the waveform is the reverse of the waveform. By doing so, the first roller portion 10 has an angular velocity V4 so as to cancel the time-series change in the flow rate when the first roller portion 10 and the second roller portion 20 are rotated at a constant speed around the axis X1. Can be decelerated to an angular velocity of V2.

After reaching the rotation angle Ra4, the control unit 600 gradually reduces the first roller unit 10 from the angular velocity V2 to the angular velocity V1 until the rotation angle Ra5 is reached. That is, the control unit 600 of the first drive unit 50 and the second drive unit 60 gradually reduces the angular velocity of the first roller unit 10 toward the separation position Po2 after the second roller unit 20 has passed the separation position Po2. Control each one.

Here, the angular velocity V2 can be any angular velocity larger than the angular velocity V1 so that the flow rate measured by the flow meter 400 does not fluctuate (pulsation) according to the characteristics of each part of the tube pump 100. For example, the control unit 600 sets the angular velocity V2 to be proportional to the first predetermined pressure Pr1 detected by the pressure sensor 300. Thereby, the pressure of the liquid in the tube 101 can be matched with the first predetermined pressure Pr1 of the liquid in the pipe 200.

After the first roller unit 10 passes the rotation angle Ra5, the control unit 600 increases the first roller unit 10 from the angular velocity V1 to the angular velocity V3 at a constant acceleration until the first roller unit 10 reaches the rotation angle Ra6. Here, the rotation angle Ra6 corresponds to a state in which the first roller portion 10 releases the crushed state of the tube 101 and the tube 101 begins to open. Therefore, the control unit 600 temporarily increases the angular velocity of the first roller unit 10 when the first roller unit 10 releases the crushed state of the tube 101. By doing so, when the first roller portion 10 releases the crushed state of the tube 101, the first roller portion 10 temporarily discharges the liquid toward the downstream side of the separation position Po2. Can be enhanced to.

This is done so that when the tube 101 changes from the state where the flow path cross section shown in FIG. 15 is 0 to the state where the flow path cross section shown in FIG. 16 is larger than 0, the first roller portion 10 and the tube 101 This is because the internal volume of the tube 101 blocked by the second roller portion 20 gradually increases. As the volume inside the tube 101 increases, the flow rate of the liquid discharged from the tube pump 100 decreases. As described above, by temporarily increasing the discharge force of the first roller portion 10, it is possible to suppress the decrease in the flow rate of the liquid discharged from the tube pump 100 and the occurrence of pulsation of the liquid.

Here, the angular velocity V3 can be any angular velocity larger than the angular velocity V1 so that the flow rate measured by the flow meter 400 does not fluctuate (pulsation) according to the characteristics of each part of the tube pump 100. For example, the control unit 600 sets the angular velocity V3 to be proportional to the first predetermined pressure Pr1 detected by the pressure sensor 300. Thereby, the pressure of the liquid in the tube 101 can be matched with the first predetermined pressure Pr1 of the liquid in the pipe 200.

Temporarily increasing the discharge force of the first roller portion 10 is particularly effective when the first predetermined pressure Pr1, which is the pressure of the liquid flowing inside the pipe 200, is relatively low (for example, 90 kPa or less). This is because when the first predetermined pressure Pr1 is relatively low, the pressure fluctuation due to the decrease in the flow rate of the liquid discharged from the tube pump 100 becomes relatively large with respect to the first predetermined pressure Pr1.

Next, the flow rate of the liquid controlled by the tube pump system 700 of the present embodiment will be described in comparison with a comparative example.

FIG. 20 is a graph showing a comparative example of the angular velocities (rad / s) of the first roller section 10 and the second roller section 20 with respect to the rotation angle Ra (°) of the first roller section 10. In the comparative example, the control unit 600 decelerates the first roller unit 10 from the angular velocity V4 to the angular velocity V1 after passing through the rotation angle Ra3 in which the tube 101 is in the open state. Further, in the comparative example, the control unit 600 maintains the angular velocity V1 until the first roller unit 10 reaches the rotation angle Ra3.

FIG. 21 is a graph showing the flow rate of the liquid measured by the flow meter 400 of the tube pump system 700 of the present embodiment. FIG. 22 is a graph showing the flow rate of the liquid measured by the flow meter 400 of the tube pump system of the comparative example.

As shown in FIG. 22, in the tube pump system of the comparative example, periodic pulsations having an amplitude of about 2 ml / min occur at intervals of about 3 seconds with respect to the flow rate of the liquid measured by the flow meter 400. During the period when the flow rate is decreasing, the first roller portion 10 passes through the rotation angle Ra3 and the tube 101 is opened, and the liquid discharged from the tube pump 100 as the internal volume of the tube 101 increases. It is presumed that the flow rate is decreasing. Further, during the period when the flow rate is increasing, as the first roller portion 10 approaches the separation position Po2, the distance between the position where the first roller portion 10 crushes the tube 101 and the separation position Po2 becomes shorter, and the first roller It is presumed that the pressure of the liquid on the downstream side of the part 10 is increasing. As described above, in the comparative example, the flow rate of the liquid measured by the flow meter 400 fluctuates after the first roller portion 10 and the second roller portion 20 pass through the separation position Po2, and the flow rate fluctuates periodically. (Pulsation) is occurring.

On the other hand, as shown in FIG. 21, in the tube pump system 700 of the present embodiment, periodic pulsation does not occur in the flow rate of the liquid measured by the flow meter 400. This means that even if the first roller portion 10 passes through the rotation angle Ra3 and the tube 101 is opened, the angular velocity of the first roller portion 10 is reduced only to an angular velocity V2 higher than the angular velocity V1, and the tube 101 It is presumed that this is because the decrease in the amount of liquid discharged from the tube pump 100 due to the increase in the internal volume of the tube pump 100 is suppressed. In addition, it is presumed that the increase in the pressure of the liquid on the downstream side of the first roller section 10 is suppressed by gradually reducing the angular velocity of the first roller section 10 as the first roller section 10 approaches the separation position Po2. Will be done.

The operation and effect of the tube pump system 700 of the present embodiment described above will be described.

According to the tube pump system 700 of the present embodiment, after one of the first roller portion 10 and the second roller portion 20 passes through the separation position Po2, the other separation position Po2 of the first roller portion 10 and the second roller portion 20 In order to gradually reduce the angular velocity toward, the pressure of the liquid on the upstream side increases as the other of the first roller section 10 and the second roller section 20 approaches the separation position Po2, and the first roller section 10 and the second roller section 20 On the other hand, the decrease in liquid pressure due to the decrease in angular velocity can be offset. Therefore, the fluctuation of the flow rate of the liquid discharged from the outflow side end portion 101b of the tube 101 can be suppressed or eliminated, and the pulsation of the liquid can be suppressed or eliminated.

Further, according to the tube pump system 700 of the present embodiment, when one of the first roller portion 10 and the second roller portion 20 passes through the separated position Po2, the first roller portion 10 and the second roller portion 20 are connected to each other. The pressure of the liquid in the tube 101 blocked by the contact rises to the first predetermined pressure Pr1 and the second predetermined pressure Pr2 having a predetermined pressure difference. Therefore, when one of the first roller section 10 and the second roller section 20 passes through the separation position Po2 and the tube 101 crushed by the first roller section 10 and the second roller section 20 returns to its original shape, the separation position is reached. The pressure difference between the pressure of the liquid on the downstream side of Po2 and the pressure of the liquid on the upstream side of the separation position Po2 becomes small and becomes a predetermined pressure difference. As a result, when one of the first roller portion 10 and the second roller portion 20 passes through the separation position Po2, the flow rate of the liquid fluctuates at the separation position Po2 as compared with the case where this pressure difference is larger than the predetermined pressure difference. The pulsation of the liquid is suppressed.

Further, the tube pump system 700 of the present embodiment includes a flow meter 400 that measures the flow rate of the liquid flowing inside the pipe 200, and the control unit 600 uses the flow rate of the liquid measured by the flow meter 400 as the target flow rate. In this way, each of the first drive unit 50 and the second drive unit 60 is controlled.

By doing so, each of the first drive unit 50 and the second drive unit 60 is controlled so that the flow rate of the liquid measured by the flow meter 400 becomes the target flow rate while suppressing the occurrence of pulsation of the liquid. can do.

In the tube pump system 700 of the present embodiment, it is desirable to adjust the opening degree of the needle valve 500 so that the first predetermined pressure Pr1 is 20 kPaG or more and 250 kPaG or less.

By doing so, the first predetermined pressure Pr1 of the liquid flowing through the pipe 200 becomes sufficiently higher than the atmospheric pressure, and the pulsation of the liquid is suppressed from being transmitted further downstream from the pipe 200.

[Other Embodiments] In the above description, the tube pump system 700 is provided with a needle valve 500 that minimizes the cross-sectional area of the flow path in the flow path that guides the liquid from the tube pump 100 to the outflow end 702. It may be the aspect of. For example, an orifice or the like that minimizes the cross-sectional area of the flow path may be provided in place of the needle valve 500 in the flow path that guides the liquid from the tube pump 100 to the outflow end 702.

Further, in the above description, in the tube pump system 700, the control unit 600 controls the tube pump 100 so that the flow rate of the liquid measured by the flow meter 400 becomes the target flow rate, but it is another embodiment. You may. For example, the flow rate measured by the flow meter 400 may not be controlled by the tube pump 100, or the flow meter 400 may not be provided.

Ten 1st roller part

20 2nd roller part

30 Drive shaft (shaft member)

40 Drive cylinder (cylinder member)

50 1st drive unit

60 2nd drive unit

70 Transmission mechanism (transmission unit)

80 Casing (accommodation member)

81 Gear housing

82 Roller housing

82a recess

82b Inner circumference

83 cover

90 Support member

100 Tube pump

101 tube

101a Inflow side end

101b Outflow side end

200 Piping

300 Pressure sensor

400 Flowmeter

500 Needle valve

600 Control unit

700 700 Tube pump system

701 Inflow end

702 Outflow end

Po1 contact position

Po2 separation position

X1 axis (1st axis)

X2 axis (second axis)