High-pressure delivery device.

The invention relates to a high-pressure conveying device for viscous to highly viscous media, with a driven by an electric motor via a Exzenterorgan piston pump, said apparatus being connected to a stationary or mobile, a follower piston which surrounds the reservoir.

A device of this kind is known industry with the label "Reichert HD Fettabschmiergerät"._-They support directly from 55-kg containers with a barrel diameter of 385 or 400 mm. Other devices with electric motor-driven piston pump, which, in contrast, by a small, attached to a grease gun and thus differ along with this portable storage container, are known from DE-PS 1,001,553, DE-AS 1,016,989 and DE-AS 1017 865. the drive by an electric motor is of the device to pneumatically driven devices the advantage of being independent of a compressed air source. Production from the reservoir out to the piston pump is preparing but in larger, ie stationary or mobile reservoirs considerable technical difficulties, since it is not enough, the disposed in the reservoir following piston, as in the hand-held devices to charge by a coil spring. Also, the lifting of the follower piston out of the reservoir, for which a lifting of the entire conveyor including its drive is required due, so it provide a high amount of force outside of the reservoir arranged for pneumatic conveyors, ie so-called barrel pumps, known lifting cylinder, by which also the is loaded follower piston to feed the medium of the pump.

The invention has for its object to find a high-pressure conveying device of the aforementioned type, which overcomes the mentioned difficulties due to a simple and inexpensive to produce and therefore compact and lightweight construction, and also improved feed characteristics and increased reliability.

The solution of this problem is due to the characterizing features of claim 1.

The promotion by means of the inventive device is thus at least two stages by the combined action between a feed screw and a piston pump, and the medium can be reliably pump from the reservoir out. An essential constructive advantage is that the feed screw and the eccentric for driving the piston pump with the same and a high speed can be driven, so that a direct clutch, that is, without the interposition of a reduction gear, the electric motor is possible, with correspondingly low weight of the Device. As the feed screw extends to the bottom of the reservoir, the high-pressure conveying device can be fixedly mounted relative to the reservoir, in contrast to devices that are lowered together with the follower piston and require management of von.der device outgoing pressure line of this movement device allows.

Due to the invention will be constructive, that the follower piston surrounds the feed screw the enclosing conveyor tube and slides on this in accordance with the consumption of media. In advantageous further development of the invention the area of ​​the reservoir is above the follower piston hermetically sealed by a lid and said cam also drives an air pump, which pressure line leads into this space, so that the follower piston is pressure-loaded and additionally helps to promote. In this way, particularly high viscosity media can promote, such as grease at low temperatures.

In a further advantageous embodiment of the invention, a handle is provided at the end of a direction away from the device or its delivery unit flexible pressure line through which the pumped fluid, such as grease, a sealant, an adhesive or the like. to the desired site of application, for example a grease nipple, is led, and that the handle carries a control member for changing the speed of the electric motor as well as an electrical switch for the circuit of a provided on the pressure line electromagnet, which operates a valve that and between the pressure suction line of the high-pressure pump is arranged. In this way, the pressure in the pressure line can be released after each use of the medium, so that renewed use with from zero can be done to the required point of use for the controlled pressure of the medium. This is a sudden emergence with a remaining after stopping high pressure and damage, for example to a grease nipple, avoided.

In order to prevent the electric motor from being overloaded by excessive pressure development in the pressure line or that due to high pressure at the application site, damage occurs, for example, if a grease nipple is blocked, in a further embodiment of the high pressure conveying device between the pressure and suction pipe of the high-pressure pump a pressure relief valve. Since both said valves, ie the valve for complete depressurization and the valve for excess pressure relief in the suction line open into it, do not lose any part of the medium, and there is no pollution of the environment, such as in the grease gun according to the US Patent 4,062,425, and no additional collecting container required 'as used according to DE-OS 3,214,917 to a grease gun. Furthermore, the handle is no shut-off valve to a continued flow of medium is required.

In application of the inventive high-pressure conveying device for the grease supply to the grease nipple of the lubrication point, it may happen that, due to a blocked grease nipple despite the high lubrication pressure no grease is supplied to the lubrication point, without that this can be noticed. The recycling promotion via the pressure relief valve in the suction pipe into it, created the false impression that the grease had come to the lubrication point. In order to avoid this disadvantage may preferably be in the pressure line of the high-pressure feed apparatus comprising means for flow detection can be provided, having a flow channel of a nonmagnetic casing of the device against the force of a spring is displaceably guided bluff body and a display body in parallel in a recess provided on the outer side of the housing and the flow passage extending guide is arranged, wherein the display body is magnetically coupled to the storage body by a partition through which is located between the guide and the flow channel. The display body of its furnishings is preferably guided in a housing groove steel ball, so that it can be followed by rolling with a low resistance to movement of the bluff body.

Further advantageous embodiments of the invention, such. As the easily producible and space-saving arrangement of these valves, a vent valve, the associated connecting channels, a check valve, the port hole for the flexible pressure pipe and the cylinder bore of the high pressure piston pump in a common block of material, with parallel or vertically extending channel bores, the following description of an embodiment of the invention can be taken with reference to the drawings.

Show it:<ul><li>1 is a partially broken away sectional view of the high-pressure conveying device,</li><li>2 is a side view of a handle at the end of _, flexible pressure line of the device,</li><li>3 shows a cross section along the line III-III of Figure 1, but with a different position of the piston,</li><li>4 shows a cross section along the line IV-IV of Figure 4,</li><li>5 shows an axial section through a flow indicator,</li><li>6 shows an axial section through the housing of the device of Figure 5,</li><li>7 shows a cross section through the housing taken along the line VII-VII of Figure 6 and</li><li>8 shows a plan view of part of the housing of the device of Figure 5 in the guide for the display body.</li></ul>

An essential feature of a device of its kind is the promotion of a stationary container 1 out through the drive of a conveyor device by means of an electric motor 2. The stationary or mobile storage container 1 is a cylindrical metal containers, as for the storage and transportation of the medium 3 with standardized known dimensions. The device thus has the advantage that a refilling device in one of the own tank is not required as with lubricating hand presses.

The conveying means, that is the pumping unit 4 with associated electric motor 2 is mounted on a cover which is mounted above the storage container 1, either directly to this or to a storage container 1 enclosing the pressure vessel. 6

Through the lid 5 and a cooperating with the reservoir 1 follower piston 7 extending therethrough to the vessel bottom 8 a rigid delivery tube 9, in the lower portion of a feed screw 10 is included. The feed screw sucks the medium 3 through lateral openings 11 at the free end of the conveying tube 9 in this in and upwards to the suction line 12 of the piston pump 13. Between the helically extending conveying passage 14 and the inner surface of the conveyor tube 9 is a sufficient play 15 is provided to the to limit delivery pressure of the feed screw on, for example, about 1 bar, and to prevent an overload of the electric motor 2 or a heating of the medium.

The follower piston 7 by means of a guide sleeve 16, in which a sealing ring 17 is included, performed on the conveying tube 9 and touches with its outer peripheral seal 18, the inner surface of the reservoir, so that its substantially complete emptying is ensured.

The follower piston 7 rests on the medium 3 and followed by the resulting due to the promotion of vacuum. In order to enable problem free pumping of highly viscous media, the electric motor 2 drives in addition to the piston pump 13 and the feed screw 10, an air pump 20 to the air via an indicated by dashed lines line 21 through the cover 5 into the container space 22 above the follower plate 7 passes and this loaded with pressure. Already an excess pressure of only 0.1 bar produced on the follower plate, a force of more than 50 kp. It is understood that the cover 5 is firmly and tightly attached to the pressure vessel for this purpose, such as the seal 23 and the partially visible, reaching under the edge bead 24 screw 25 show from the several available.

The electric motor 2, which is only partially visible in Figure 1 corresponds to a commercial, intended for example for hand drills version with electrically continuously controllable speed. It is with its shaft 26 coaxial with the feed screw 10 and its drive shaft 27 and thus coaxially mounted to the circular cylindrical Before storage container 1 at the top of a drive housing 28 which in turn is attached to the lid. 5 The motor shaft 26 extends binein into the drive housing 28 and is connected there via a coupling sleeve 30 with a short eccentric shaft 31, which connects to the drive shaft 27 of the feed screw, for example via a threaded pin 32 which is screwed coaxially in the drive shaft 27th The drive shaft 27 extends through a bore with a seal 33 in the bottom 34 of the drive housing 28th

At two diametrically opposed, axially parallel outer Gehäuseabflachungen 36.37 a housing block 38 and on the other hand, the air pump 20 is on the one hand fastened flat against. The rod-shaped high-pressure piston 40 of the piston pump 13 and the piston rod 41 of the executed as a piston pump air pump 20 extend perpendicular to these Gehäuseabflachun^Gs 36.37 in from the actuator housing 28 out into the cylinder 42 inside the housing block, or in the cylinder 50 of the air pump 20th Your drive is shared by a back on opposite longitudinal sides by the eccentric 44 of the eccentric shaft 31 and forth movement 0-shaped cam ring 45 are tightened. The cam ring 45 moves on both sides by its rigid connection to the high pressure piston 40 and the piston rod 41 guided linearly within the Antriebsgehäuscs 28 back and forth, while the eccentric angles thereto reciprocates with him enclosing annular ball bearing 46 in the cam ring.

The sealing of the high pressure piston 40 is effected by a rod seal 48, which is sunk used on the side of the housing block, which bears against the Gehäuseabflachung 36th The piston 49 of the air pump 20, however, has only a gap seal to the cylinder 50 and a relatively short stroke, so that the air pressure generated remains low and does not require massive construction of the pressure vessel. 6

The control of the entry and outlet of the air pump 20 takes place through the check valves 51 and 52nd

The formed from a solid metal block housing block 38 has a plurality of vertically extending to its cuboid disposed outer surfaces of holes that form flow channels for the medium, and receiving openings for different valves. The cylinder bore 42 of the high-pressure pump 13 opens into the pressure line bore 54 of larger diameter, in which the pump check valve are enclosed with the spherical closing body 55 and the valve spring 56th In the outer end of the pressure line bore 54 of the connection nipple 57 leading to the handle 58 the flexible pressure conduit 53 is screwed. The suction line 12 of the high-pressure pump is parallel to the cylinder bore 42 and the pressure line bore 54 under these to the vertical conveying tube 9, passing through a base part 59 of the drive housing 28. This base part 59 continues downwards in a neck portion 60^- continuing, in which the vertical feed pipe 9 is screwed and which in turn inserted into the lid 5 of the pressure vessel: is screwed. Top of the neck portion is 60 over in a bell-shaped space 61, in which the transition from the larger cross-section conveyor tube 9 takes place valveless to the suction line 12th

A right angle branching off link 62 of the suction line 12 opens into the bore 42 and continues upwards in a vent line 63 with a manually operable vent valve 64 continues. In addition, the suction pipe 12 is extended beyond the branching connector 62, and up to a direction perpendicular to their plane intersecting the pressure line hole and the connecting lines 66,67 are located between the suction pipe 12 and the pressure line bore 54 für.die return of a medium from a pressure relief valve 68 in the connecting line 67 and a pressure relief valve 69 in the connecting line 66, as best shown in the Fig.4. For a rectangular course of these interconnections 66.67 they are each prepared by two intersecting bores, which are closed to the outside by a threaded pin 65th The mounting holes 54,70,₇₁ for pumping non-return valve (55,56), the Druckentla-, stungsventil 68 and the pressure relief valve 69 are located in a common horizontal plane. Their closure body is formed in each case by a ball by a spring, respectively. a plunger 72 are held in pressure relief valve 68 in closed position. The plunger 72 is movable through a side of the housing block 38 fixed electromagnet 73 against the pressure of a not shown, combined with the solenoid spring. The activation of electromagnet 73, which is only partially visible in the drawings, and thus the closing of the pressure relief valve 68 is effected by means of provided at the handle 58 switching means 75th

For stepless change in the speed of the electric motor 20 and thus the regulation of the conveying speed in the conduit 54 during application or delivery of the medium to a point of use, the Schalteirrichtung is carried out 75 as a sliding switch that is pressed into the handlebar 76th also is for the area regulating the slide switch a dial 77 available. The electrical cable 78 connects to the electric motor 2 and to the electromagnet 73rd

The handle 58 shown as an exemplary embodiment is carried out for the supply of lubricant to a lubricating nipple and has for this purpose a supply pipe 79 with a Ankupplungsmuffe 80. For this application the particular through the pressure relief valve 69 maximum pressure is for example 400 bar, although not produced by the apparatus higher pressures could become.

The example in the pressure line 53 disposed means for flow detection has a circular cylindrical housing block 4 '. In the coaxially enclosed in it hole 6 'is an elongated bluff body 3'geführt, the 5'angrenzt in the longitudinal direction at a 6'eingeschlossene also in this bore a helical spring. To enable, despite the leadership of the bluff body 3 'in this hole 6'eine flow through the device, the bluff body 3'eine other outer cross-sectional shape as the flow channel of the device forming bore 6t For example, this cross-sectional shape of the bluff body 3'quadratisch, with a diagonal dimension, so that the storage body is guided 6'verschiebbar 3'an its four longitudinal edges in the hole equal to the bore diameter. It is understood that between this diagonal dimension and the bore diameter a sufficient tolerance Mass is present in order to ensure a sliding guide. The edge of the bluff body 3 'are preferably flattened or rounded. On the upstream side of the bluff body this 3'liegt in its initial position under the pressure of the coil spring 5 'to a hole paragraph 7'an on which the bore diameter 6'ihren slightly reduced, for example, from 6 to 5 mm.

At the two ends of the housing block connecting thread for connecting sleeves 8 4 'are', 9 'of tubing a grease gun provided, on the side of Schraubenfeder5' on the housing block, a connection piece is available 10 'with an external thread, onto which the coupling sleeve is 9'aufgeschraubt , The flow channel 11 'of this connecting sleeve 9'hat a smaller diameter than the coil spring 5', so that the screwed connection sleeve 4'einschliesst the coil spring 5'unter bias in the housing block.

As best seen in the Figure 6 to 8, the housing block has 4 'over a limited part of its length a parallel to the longitudinal axis of the housing block 4'verlaufende flattening 12', which forms 4'eine secant in cross section to the circumference of the housing block. Between this flat portion 12 'and the inner surface of the housing block 4'aufgescho surrounded sleeve 1', which at least in the region of the flattened portion 12 'is transparent, there is a cavity 13' for receiving a display body 2 '. The message body consists for example of a steel ball 2 ', and for keeping the display movement of steel ball 2'befindet in the flattening of a longitudinal groove 14', the bottom only by a relatively thin partition 15'von blocks the ram body 3'einschliessenden hole 6 ' is isolated. This intermediate wall 15'besteht, as is the entire housing block 4 ', made of a nonmagnetic material such as aluminum, and through them the bluff body 3' and the display body are 2'magnetisch coupled with each other by the dam body 3 'and / or the consist indicator body 2'aus magnetized material. Preferably, the bluff body is 3'aus a permanent magnet and the indicator body 2'aus a steel ball. For a clear indication of the position of the display body of the bottom of the longitudinal groove 14'mit a color, such as red 2 'is provided, which contrasts with the color of the display body, and the flat 12; adjacent to the longitudinal groove, is preferably colored differently to the color of the longitudinal groove 14:<ul><li>When the flow through the device is the storage body 3 'is pressed by the dynamic pressure of the flow against the coil spring 5' and displaced against its spring force corresponding to the flow velocity. Here, the lubricant flows outside of the bluff body 2'entlang. The magnetic coupling of the display body leads 2'um the same way from a position change that occurs by its design as a ball with little resistance. Thus, the flow through the device is easy to see, and it is ensured that a lubrication point is actually supplied with grease.</li></ul>

Thus, the flow display takes place even at low flow rates, the coil spring has a conical shape 5'vorzugsweise, ie progressive characteristic.