Solenoid for electromagnetic valve

[Technical Field to which the Invention Affiliates] The present invention relates to a solenoid valve that simplifies the configuration and assembly of an energizing system.

PROBLEM TO BE SOLVED: To provide a valve portion having a valve body for switching a flow path by contacting and separating from a valve seat in a valve body, and a solenoid for driving the valve body in a direction of contacting and separating from the valve seat. In a solenoid valve provided with a portion, an energizing terminal for energizing the solenoid portion is usually led out from between yokes provided on the outside of the coil in the solenoid portion. Therefore, a means for electrically insulating the energizing terminal of the solenoid part and leading it out to the outside is required, and it takes time and effort to assemble that part, and in particular, the solenoid valve is formed to be waterproof and drip-proof. In this case, it is necessary to consider a special means for the liquidtightness of the lead-out portion of the energizing terminal in the solenoid portion, and there is a problem that the structure is complicated and it takes time and effort to assemble.

[0003] [Problems to be Solved by the Invention] A technical problem of the present invention is to provide an electromagnetic valve which simplifies the configuration and assembly of an energization system to a solenoid unit and, as a result, improves the assembling property. .. A more specific technical problem of the present invention is to provide a solenoid valve in which the insulation of the solenoid portion and its energizing system can be easily ensured. Another technical object of the present invention is to provide an electromagnetic valve in which the insulating structure of the current-carrying system to the solenoid portion is simplified by effectively utilizing the electrical insulation property of the valve body made of synthetic resin. Another technical object of the present invention is to provide a solenoid valve capable of easily ensuring waterproofness and drip-proofness of a solenoid portion and its energizing system.

[Means for Solving the Problems] The solenoid valve of the present invention for solving the above problems includes a valve portion including a valve body for switching a flow path by contacting and separating from a valve seat in the valve body. With a solenoid unit that drives the valve body in the direction of contact and separation with respect to the valve seat<u style="single">, With the terminal housing that energizes the solenoid part</u>The solenoid valve provided with the above-mentioned valve body is made of an electrically insulating synthetic resin, and the energizing terminal constituting the energizing system of the solenoid portion is provided.<u style="single">Protruding from the joint surface with the valve body in the solenoid part,</u>On the joint surface with the solenoid part in the valve body<u style="single">Along with opening a terminal insertion hole, an opening communicating from the outside to the terminal insertion hole is provided on the side surface of the valve body, and the energizing terminal of the solenoid portion is provided in the terminal insertion hole to a position facing the opening.</u>In the inserted state, fix the solenoid part and the valve part.<u style="single">、</u>On the terminal housing attached to the valve and / or solenoid<u style="single">, A contact terminal to be inserted through the opening is provided by attaching the terminal housing, and the contact terminal is connected to the valve portion and / or the solenoid portion.</u>By installing the terminal housing<u style="single">, Configured to be electrically connected to the energizing terminal inserted in the terminal insertion hole</u>It is characterized by that.

[0005] In a preferred embodiment of the solenoid valve of the present invention, the terminal block constituting the base of the terminal block is fixed to the solenoid section, and the board assembly placed on the terminal block is connected to the current-carrying terminal. Contact terminals, electronic components for energization circuits, and connectors for connecting to external power supplies are provided, and further, contact terminals for connecting to energization terminals provided on the board assembly are provided.<u style="single">the above</u>Inserted through the opening<u style="single">、</u>It is formed by a pair of elastic contacts that elastically sandwich the energizing terminal in the terminal insertion hole.

[0006] In the solenoid valve having the above configuration, the valve body is formed of an electrically insulating synthetic resin, and the solenoid part and the valve part are fixed in a state where the energizing terminal to the solenoid part is inserted into the terminal insertion hole in the valve body. Then, the contact terminal provided on the external terminal housing or the like is brought into contact with the energizing terminal in the terminal insertion hole, and more preferably, the contact terminal is formed by a pair of elastic contacts to form a terminal of the valve body. By inserting through an opening that communicates with the insertion hole and forming the energizing terminal so as to elastically sandwich it in the terminal insertion hole, the configuration and assembly of the energizing system to the solenoid part is simplified, and the above-mentioned electrical insulation property is provided. By effectively utilizing the valve body made of synthetic resin, a part of it has a function as a housing for the connection part of the energizing terminal and the contact terminal, thereby significantly simplifying the insulating structure of the energizing system of the valve body and making electricity. Insulation can be easily ensured.

[0007] Further, in the solenoid valve of the present invention, a magnetic cover provided on the outside of the coil in the solenoid portion is formed so as to form an outer shell of the solenoid portion and to enclose it in a liquid-tight manner, and the magnetic cover is formed. The valve body can be liquid-tightly fixed to the open end side of the solenoid valve, and the contact terminal connected to the energization terminal can be liquid-tightly inserted into the opening of the valve body. It is possible to easily ensure the waterproofness and drip-proofness of the system.

[Embodiment of the Invention] FIGS. 1 to 8 show a first embodiment of a solenoid valve according to the present invention, and the solenoid valve is generally a valve constituting a 3-port valve. A part 1 and a solenoid part 2 for driving the part 1 are provided, and a terminal housing 3 for energizing the solenoid part 2 is provided along the outside thereof.

[0009] The valve body 10 in the valve portion 1 is formed of an electrically insulating synthetic resin, and has a valve chamber 11 internally which an input port P, an output port A, and an discharge port R communicate with each other. The valve chamber 11 is formed by a valve hole opened on the outer end surface of the valve body 10 opposite to the joint surface 10a with the solenoid portion 2, and is opened on the side surface of the valve body 10 in the valve chamber 11. The input port P and the output port A are sequentially communicated with the inner surface of the valve hole provided in the valve body 10 from the opening side of the valve hole, and the discharge port R is a discharge provided on the inner inner surface of the valve hole. It is opened in the valve seat 16. Then, the valve chamber 11 is selectively contacted with the valve seat body 12 provided with the supply valve seat 15 communicating with the input port P via the flow path 14, and the supply valve seat 15 and the discharge valve seat 16. The poppet valve body 20 to be separated is accommodated, and the valve hole opening is closed by the holding plate 19.

[0010] The valve seat body 12 is provided so that the flow path 14 is opened around the valve seat body at a position communicating with the input port P, and the presser plate 19 side is provided from the portion where the flow path 14 is provided. The diameter is reduced and fitted into the tubular valve seat body receiving portion 19a of the holding plate 19, and the other end of the flow path 14 is opened in the supply valve seat 15 facing the poppet valve body 20 to open the valve chamber. Sealing members 13a and 13b are arranged on both sides of the flow path 14 between the inner surface and the inner surface of the 11 to seal the seal members 13a and 13b. ing. The space between the valve seat body 12 and the holding plate 19 is opened to the outside by the vent 19b. The range of movement of the valve seat body 12 toward the poppet valve body 20 side is limited by the stopper portion 21 formed in the valve chamber 11, and the stopper portion 21 is discharged by energizing the solenoid portion 2. The supply valve seat 15 is provided at a position where the supply valve seat 15 is stopped close to the poppet valve body 20 at the contact position with the 16.

[0011] Further, the valve seat body 12 has a first fluid pressure action in which the fluid pressure flowing from the input port P acts on the flow path 14 to press the valve seat body 12 in the direction of the poppet valve body 20. A surface 17 is provided, and a second fluid pressure acting surface 18 that presses the valve seat body 12 in the opposite direction is provided. The effective fluid pressure action area of the first fluid pressure action surface 17 is set to be larger than the effective fluid pressure action area of the second fluid pressure action surface 18, but this area difference is set to the valve seat body 12. A small-diameter portion to be fitted and inserted into the valve seat body receiving portion 19a of the presser plate 19 is provided, and the portion of the small-diameter portion facing the flow path 14 is formed as a second fluid pressure acting surface 18. .. Although the embodiment in which the valve seat body 12 is moved in the axial direction of the valve hole has been described here, it goes without saying that the valve seat body may be provided in a fixed manner.

[0012] On the other hand, the poppet valve body 20 is arranged between the supply valve seat 15 and the discharge valve seat 16 in the valve chamber 11, and the valve seats 15 are arranged by energizing or releasing the solenoid portion 2. , 16 are opened and closed, and the poppet valve body 20 is opened and closed by the solenoid unit 2. Therefore, the poppet valve body 20 has a pair of pushes integrated with a cover 20a attached to the outer peripheral portion thereof. A rod 20b is provided, and these push rods 20b are led out to the solenoid portion 2 side from a hole provided in the valve body 10 at a position straddling the discharge valve seat 16 (see FIG. 2), and the tip thereof is a movable iron core of the solenoid portion 2. It is in contact with 33.

[0013] Further, a poppet spring 25 for pressing the poppet valve body 20 toward the discharge valve seat 16 is interposed between the periphery of the supply valve seat 15 and the poppet valve body 20 in the valve seat body 12. There is. The urging force of the poppet spring 25 does not exceed the urging force generated in the valve seat body 12 due to the area difference between the first and second fluid pressure acting surfaces 17 and 18 in the valve seat body 12.

As is clearly shown in FIGS. 1 to 3 and 7, the solenoid portion 2 fits and fixes the fixed iron core 32 into one end of the bobbin 30 around which the coil 31 is wound, and is attached to the fixed iron core 32. A magnetic cover 34 that slidably fits the movable iron core 33 that is attracted to the coil 31 and surrounds the coil 31 to form an outer shell of the solenoid portion 2 and a magnetic field located between the magnetic cover 34 and the movable iron core 33. A magnetic path is formed around the coil 31 by the plate 35. The fixed core 32 and the movable core 33 have an oval or elliptical cross section so that magnetic attraction can be efficiently generated, and the central holes of the bobbin 30 and the magnetic plate 35 are also formed accordingly. It is formed in a similar shape.

[0015] The magnetic cover 34 is formed so as to form an outer shell of the solenoid portion 2 by deep drawing of a magnetic material (iron plate) to cover the entire solenoid portion 2, and here, a terminal housing 3 is provided on the side surface. The mounting hole 36 is provided, but by eliminating this and fixing the terminal housing with an adhesive or other means that does not impede the liquidtightness of the magnetic cover 34, the waterproofness and drip-proof property of the solenoid portion 2 are ensured. be able to. Further, the bobbin 30 is provided with a pair of energizing terminals 40 constituting an energizing system for the solenoid portion 2 (FIG. 7), and the notch portion of the magnetic plate 35 is provided with the energizing terminals 40 facing the open end side of the magnetic cover 34. It is projected through.

[0016] Further, a ring 37 made of synthetic resin is fitted on the outer end side of the movable iron core 33, and a return spring 38 of the movable iron core is contracted between the ring 37 and the magnetic plate 35. The ring 37 also has a function as a stopper for stopping the movable iron core 33 immediately before the movable iron core 33 is attracted to the fixed iron core 32. In the figure, 39 indicates a sealing material.

[0017] Here, the operation of the valve portion 1 will be briefly described. In the non-energized state of the solenoid valve 2 of the solenoid valve, as shown in the left half of FIG. 1, the poppet valve body 20 opens the discharge valve seat 16, the output port A communicates with the discharge port R, and the atmosphere. It is in an open state. On the other hand, the supply valve seat 15 is closed by the poppet valve body 20. In this case, the air pressure flowing from the input port P into the flow path 14 of the valve seat body 12 acts on the first and second fluid pressure acting surfaces 17 and 18, but on the first fluid pressure acting surface 17. Since the area is larger than the area of the second fluid pressure acting surface 18, the valve seat body 12 is displaced in the direction of contact with the stopper portion 21 in the valve body 10, and the supply valve seat 15 energizes the solenoid portion 2. It is located close to the position of the poppet valve body 20 at the time, and is closed by the poppet valve body 20 at that position.

When the solenoid unit 2 is energized in this state, as shown in the right half of FIG. 1, the movable iron core 33 is attracted to the fixed iron core 32 to open the supply valve seat 15 and at the same time close the discharge valve seat 16. , The supply valve seat 15 is displaced in advance to a position close to the poppet valve body 20 when energized, and the movable iron core 33 only needs to be sucked by a small stroke, so that the suction force acting on the movable iron core 33 becomes large, or A small solenoid can generate the suction force required for valve opening, and the supply valve seat 15 can be easily opened.

[0019] When the supply valve seat 15 is opened in this way, compressed air flows into the chamber on the secondary side of the valve seat through the supply valve seat 15, so that the valve seat body 12 becomes the second fluid pressure acting surface 18 The fluid pressure acting on the poppet valve body 20 moves away from the poppet valve body 20, whereby the poppet valve body 20 is separated from the supply valve seat 15 and its opening amount is further increased, that is, it is opened so that a large flow rate can be obtained. To speak. Next, when the energization of the solenoid unit 2 is released, the movable iron core 33 is restored by the urging force of the return spring 38 to close the supply valve seat 15 and at the same time open the discharge valve seat 16. As a result, the valve seat body 12 moves to the poppet valve body 20 side due to the fluid pressure of the flow path 14 and comes into contact with the stopper 21, so that the movable iron core 33 is prepared for valve opening with a small stroke.

As is clearly shown in FIGS. 4 to 6, the valve body 10 formed of the electrically insulating synthetic resin protrudes from the bobbin 30 of the solenoid portion 2 on the joint surface 10a with the solenoid portion 2. A terminal insertion hole 45 for receiving the energizing terminal 40 is opened, and the solenoid portion 2 and the valve portion 1 are fixed in a state where the energizing terminal 40 is inserted into the terminal insertion hole 45. As illustrated in FIG. 1, it is desirable to press the fastening portion 34b formed by making a cut 34a in the magnetic cover 34 into the recess 46 provided in the valve body 10 to fix both of them. Other optional means can be used. Further, when fixing the solenoid portion and the valve portion 1, by interposing a seal member 47 between them, the solenoid portion 2 is formed in a liquid-tight state except for the portion of the mounting hole 36 of the terminal housing 3. can do.

[0021] On the other hand, the terminal housing 3 is fixed to the solenoid portion 2 by a mounting hole 36 provided on the side surface of the magnetic cover 34. The terminal block 3 is fixed by providing an elastically deformable protrusion 50a on the synthetic resin terminal block 50 constituting the base thereof and press-fitting the protrusion 50a into the mounting hole 36, and fixing the terminal block 50. The board assembly 51 is placed on the board, and the connector cover 60 is attached on the board assembly 51. The board assembly 51 is used for various energization circuits including a contact terminal 53 extending to the energization terminal 40 in the terminal insertion hole 45 and electrically connected to the energization terminal 45 on the printed circuit board 52, and an energization indicator lamp 55. It is provided with an electronic component 54 and an energizing pin 56 for a connector connected to an external power supply. The terminal housing 3 does not necessarily have to be attached to the solenoid portion 2, and can be attached to the valve body 10 of the valve portion 1 or both of the valve body 10 and the solenoid portion 2.

The contact terminal 53 connected to the energization terminal 40 is inserted into the terminal insertion hole 45 in the valve body 10 through an opening 48 communicating from the outside of the valve body, and the energization terminal 40 in the terminal insertion hole 45. It is formed by a pair of elastic contacts that extend to the part of and elastically sandwich the energizing terminal 40 (see FIG. 6). Further, the energizing pin 56 for the connector is fixed to the substrate 52 and arranged so as to extend into the connector connection port 60a of the connector cover 60.

[0023] Further, the connector cover 60 basically covers the entire board assembly 51 on which various electronic components 54 for energization circuits and the like are mounted, and a protrusion 50b provided on the terminal block 50 is locked into a locking hole. Although it is attached by locking it to 60c (see Fig. 3), the entire terminal housing 3 can be formed liquid-tightly if necessary. The connector cover 60 is not only provided with the connector connection port 60a for receiving the energization pin 56, but is also provided with a light-transmitting lamp window 60b so as to be located outside the energization display lamp 55.

[0024] The energizing pin 56 can be projected in an arbitrary direction and extended into the connector connection port 60a provided therein so as to be suitable for the usage mode of the solenoid valve. For example, FIGS. 1 to 6 In the substrate assembly 51 of the embodiment shown in FIG. 8, the energizing pin 56 is projected in a direction orthogonal to the side surface of the solenoid valve, and the connector connection port 60a in the connector cover 60 is provided in that direction. Further, as in the substrate assembly 51A shown in FIG. 11, the energizing pin 56A may be provided so as to project upward from the substrate 52, and the connector connection port 60a of the connector cover 60 may be provided in that direction. Any means can be used to fix the energizing pins 56 and 56A to the substrate 52. Further, as in the board assembly 51B shown in FIG. 10, the lead wire 58 for energization can be directly led out from the connector cover 60 without providing the energizing pin and the connector connection port. In the figure, 62 shows a bolt hole for fixing the solenoid valve.

FIG. 11 shows the appearance of the embodiment provided with the substrate assembly 51A shown in FIG. 9, but the connector cover 60 in the figure is not depicted. Since the configurations other than the above in FIG. 11 are the same as those in the examples of FIGS. 1 to 7 described above, the same or corresponding parts as in the case of the embodiment are designated by the same reference numerals and the description thereof will be described. Omit.

[0026] Further, FIG. 12 shows the configuration of an embodiment in which the solenoid valve according to the present invention is a waterproof / drip-proof type. Basically, the piston plate is not provided with the terminal housing 3 in the above embodiment. The solenoid valve is directly attached to the solenoid valve mounting body 70 such as a sub-plate or a sub-plate, and at that time, the fluid flow path and the energization system that flow in and out of the solenoid valve mounting body 70 are connected to the solenoid valve mounting body. A terminal on the valve body 10 is provided on the side surface of the valve body in which the input port P, the output port A, and the discharge port R in the above embodiment are arranged in a row so that the solenoid valve can be mounted on the 70 at the same time on the joint surface. An opening 48 is provided through which the contact terminal 53A for contacting the energizing terminal 40 in the insertion hole 45 is inserted.

[0027] The contact terminal 53A is provided on the solenoid valve mounting body 70, and the energization system thereof is provided with a contact terminal 53A corresponding to the substrate assembly 51 or the like in the above embodiment, if necessary. The structure of the contact terminal 53A itself is not substantially different from that of the above embodiment. Further, in this embodiment, the solenoid valve is a waterproof / drip-proof type as described above, but for that purpose, the terminal housing 3 is attached to the magnetic cover 34 constituting the outer shell of the solenoid portion 2 as in the above embodiment. The solenoid portion 2 is liquid-tightly encapsulated by the magnetic cover 34 without providing the mounting hole 36 of the above, and when the solenoid portion 2 and the valve portion 1 are fixed, a seal member 47 is interposed between them. The sealing member 47 also seals the periphery of the energizing terminal 40, and the sealing member 65 also seals the periphery of the insertion opening 48 of the contact terminal 53A provided in the valve body 10. Therefore, the solenoid valve itself is maintained in a liquidtight state.

[0028] In the solenoid valve having the above configuration, the solenoid unit 2 is formed with the valve body 10 made of an electrically insulating synthetic resin and the energizing terminal 40 for the solenoid unit 2 is inserted into the terminal insertion hole 45 in the valve body. And the valve portion 1, and the contact terminals 53, 53A provided in the external terminal housing 3 or the like are inserted through the opening 48 communicating with the terminal insertion hole 45 of the valve body 10 to enter the terminal insertion hole 45. Since it is brought into contact with the energizing terminal 40 of the above, the configuration and assembly of the energizing system to the solenoid unit 2 can be simplified, and the valve body 10 made of the electrically insulating synthetic resin can be effectively used. It is possible to provide a part of the function as a housing for the connection part of the energization terminal 40 and the contact terminals 53, 53A, thereby remarkably simplifying the insulation structure of the energization system of the valve body 10 and easily ensuring the electrical insulation. it can.

[0029] Further, in the solenoid valve, as in the embodiment shown in FIG. 12, the valve body 10 is provided on the open end side of the magnetic cover 34 which constitutes the outer shell of the solenoid portion 2 and tightly encloses the outer shell. By fixing it liquid-tightly and inserting the contact terminals 53, 53A connected to the energizing terminal 40 into the opening 48 of the valve body in a liquid-tight manner, the solenoid part 2 and its energizing system can be easily waterproofed and drip-proof. Can be secured.

[Effect of the Invention] According to the solenoid valve of the present invention described in detail above, the electrical insulation of the valve body made of synthetic resin is effectively utilized to configure and assemble the current-carrying system to the solenoid portion. It is possible to provide a solenoid valve which is simplified, as a result, the assembling property is improved, and the insulation of the solenoid portion and its energizing system can be easily secured, and further, the solenoid portion and its energizing system are waterproofed. -It is possible to obtain a solenoid valve whose drip-proof property can be easily ensured.

BRIEF DESCRIPTION OF THE DRAWINGS [Fig. 1] An embodiment of a solenoid valve according to the present invention is shown in a side cross section in which the left half of the valve portion and the solenoid portion is shown in the non-energized state of the solenoid portion and the right half is shown in the energized state. It is a figure.

FIG. 2 is a vertical cross-sectional view of the above embodiment.

FIG. 3 is a partial plan sectional view of the above embodiment.

FIG. 4 is a cross-sectional view of a main part at a position different from that of FIG. 1 of the above embodiment (position indicated by the arrow AA in FIG. 5).

FIG. 5 is a partial vertical cross-sectional view at a position different from that of FIG. 2 of the above embodiment.

FIG. 6 is a partial plan sectional view at a position different from that of FIG. 3 of the above embodiment (the position indicated by the BB arrow in FIG. 5).

FIG. 7 is an exploded perspective view showing a configuration of a solenoid unit in the above embodiment.

FIG. 8 is a side view showing a configuration of a board assembly and a terminal block cover in the above embodiment.

FIG. 9 is a side view showing the configurations of other board assemblies and terminal block covers that can be used in the above embodiment.

FIG. 10 is a side view showing the configuration of still another board assembly and terminal block cover that can be used in the above embodiment.

11 is an exploded perspective view of the solenoid valve of the present invention using the substrate assembly and terminal block cover of FIG. 9. FIG.

FIG. 12 is a cross-sectional view of another embodiment of the present invention made waterproof.

[Description of code] 1 Valve part 2 Solenoid part 3 Terminal housing 10 Valve body 10a Joint surface 20 Poppet valve body 31 Coil 34 Magnetic cover 40 Energizing terminal 45 Terminal insertion hole 47 Sealing member 48 Opening 50 Terminal block 51,51A, 51B Board Assembly 52 Board 53,53A Contact terminal 56,56A Energizing pin 65 Sealing member