JP2014214806A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve which achieves valve portions thereof, of high sealability, even when it is used as a multi-way valve.SOLUTION: A spool valve portion is composed of: a region between a first port P1 and a second port P2 of an inner peripheral face of a valve sleeve 310; and an outer peripheral face of a spool 320. A first poppet valve portion PV1 is composed of: a first seat surface 333b of a first valve seat member 330; and an end portion 325 at the tip side of the spool 320. A second poppet valve portion PV2 is composed of: a second seat surface 312 of a valve sleeve 310; and a step surface 326 of the spool 320. A third poppet valve portion PV3 is composed of: a third seat surface 233 of a center post 230; and an end portion 327 at the rear end side of the spool 320. The first valve seat member 330 is expandable and contractible in the moving direction of the spool 320.

Description

  The present invention relates to a solenoid valve capable of controlling fluid pressure.

  Conventionally, a solenoid valve provided with a spool valve is known (see Patent Document 1). Such a solenoid valve has an advantage that a plurality of ports can be opened and closed at once by a spool reciprocally moved by the solenoid. Therefore, it is widely used as a multi-way valve. However, the spool valve has a disadvantage that the sealing performance is inferior to that of the poppet valve. Accordingly, when a multi-way valve requires a valve portion that requires sealing performance, it is difficult to obtain satisfactory quality with the solenoid valve provided with the spool valve according to the conventional example.

JP 2009-63022 A

  An object of the present invention is to provide a solenoid valve capable of realizing a valve portion with high sealing performance even when used as a multi-way valve.

  The present invention employs the following means in order to solve the above problems.

That is, the solenoid valve of the present invention is
A solenoid valve having a cylindrical spool that reciprocally moves in the valve sleeve by a solenoid;
The valve sleeve has three through-holes penetrating from the hollow interior to the side surface, and the openings to the side surfaces of these three through-holes are in order from the front end side to the solenoid on the rear end side. The first port, the second port, and the third port are used as fluid inlets and outlets, respectively, and the opening that opens at the end on the tip side in the hollow interior is used as the fourth port as the fluid inlet and outlet.
In the solenoid valve in which the spool valve portion is configured by the region between the first port and the second port in the inner peripheral surface of the valve sleeve and the outer peripheral surface of the spool,
A cylindrical first valve seat member provided on the tip side of the hollow inside of the valve sleeve and provided to be able to maintain a close contact with the inner peripheral surface of the valve sleeve; A first poppet valve portion is constituted by the first seat surface in the one valve seat member and the end portion on the front end side of the spool that can be seated and separated from the first seat surface,
A second seating surface formed of a stepped surface facing the rear end side provided in a region between the second port and the third port on the inner peripheral surface of the valve sleeve, and seated on the second seating surface And the second poppet valve portion is configured by a stepped surface that is provided so as to be separable and that is provided on the outer peripheral surface of the spool and faces the front end side,
A cylindrical second valve seat member provided on the rear end side of the hollow inside of the valve sleeve from the spool and provided so as to be able to maintain a close contact with the inner peripheral surface of the valve sleeve; A third poppet valve portion is configured by the third seat surface in the second valve seat member and the end portion on the rear end side of the spool that can be seated and separated from the third seat surface,
The first valve seat member is configured to be extendable and contractible in the moving direction of the spool.

  According to the solenoid valve of the present invention, since it has four ports, it can be used as a multi-way valve. And since three places were made into poppet valve parts among four valve parts, the sealing performance of these valve parts can be improved. In addition, since the first valve seat member can be expanded and contracted in the moving direction of the spool, it is possible to close both the first poppet valve portion and the second poppet valve portion at the same time while maintaining high sealing performance. .

The first valve seat member is
A bellows portion that can be expanded and contracted in the moving direction of the spool;
An outer peripheral surface portion provided on the rear end side of the bellows portion and slidably provided on an inner peripheral surface of the valve sleeve; and a valve seat portion having a first seat surface on the rear end side. It is characterized by providing.

  Thereby, the state which contact | adhered with respect to the internal peripheral surface of a valve sleeve can be maintained, enabling a 1st valve-seat member to shrink | contract in the moving direction of a spool.

  As described above, according to the present invention, a valve portion with high sealing performance can be realized even when used as a multi-way valve.

FIG. 1 is a schematic cross-sectional view of a solenoid valve according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a solenoid valve according to an embodiment of the present invention. FIG. 3 is an explanatory view of the spool according to the embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

(Example)
A solenoid valve according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic cross-sectional view of a solenoid valve according to an embodiment of the present invention, showing a state where a solenoid is energized. FIG. 2 is a schematic cross-sectional view of the solenoid valve according to the embodiment of the present invention, and shows a state in which the solenoid is not energized. FIG. 3 is an explanatory view of the spool according to the embodiment of the present invention. In FIG. 3, a part of the external view of the spool is shown at the center, the XX cross-sectional view is shown on the left side, and the YY cross-sectional view (corresponding to the Y1Y1 cross-sectional view in FIG. 1) is shown on the right side.

<Overall configuration of solenoid valve>
With reference to FIG. 1, the whole structure of the solenoid valve 100 which concerns on the Example of this invention is demonstrated. The solenoid valve 100 includes a solenoid unit 200 that functions as an actuator for reciprocation, and a valve unit 300 that functions as a multi-way valve controlled by the solenoid unit 200. In the following description, the end side (the left side in FIGS. 1 to 3) on the side where the valve unit 300 is provided is the tip side, and the opposite side (the side on which the solenoid unit 200 is provided) is the rear side. It is called the end side.

The solenoid unit 200 is magnetized on the magnetic attraction surface 231 of the center post 230 by forming a magnetic circuit by the bobbin 211, the coil 212 wound around the bobbin 211 and generating a magnetic field by energization, and the magnetic field generated by the coil 212. And a plunger 220 to be sucked automatically. The plunger 220 is provided with a slit 221 on the outer peripheral surface in order to suppress the resistance of the fluid received when the plunger 220 reciprocates. A rod 240 that reciprocates together with the plunger 220 is provided on the distal end side of the plunger 220. The rod 240 is disposed so that the tip side thereof reaches the inside of the valve unit 300 through the insertion hole 232 of the cylindrical center post 230.

  The solenoid unit 200 also includes a pair of plates 251 and 252 and a case 253 each made of a magnetic member in order to form the above magnetic circuit. The solenoid unit 200 also includes a bearing 260 made of a nonmagnetic member on the outer peripheral surface side of the center post 230 and the plunger 220. Furthermore, a connector portion 270 that is integrally provided with a plate 252 is also provided on the rear end side of the solenoid portion 200. The connector portion 270 is provided with a terminal 271 that is electrically connected to the coil 212. The annular gap between the connector portion 270 and the case 253 is sealed with an O-ring O1. Further, the solenoid unit 200 is provided with a spring 280 that urges the plunger 220 in a direction in which the plunger 220 is pulled away from the center post 230.

<Valve part>
The valve unit 300 will be described in detail. The valve unit 300 includes a valve sleeve 310 and a cylindrical spool 320 configured to reciprocate within the valve sleeve 310.

  The valve sleeve 310 has three through holes that penetrate from the hollow interior to the side surface. And the opening part to the side surface side in these three through-holes is used as the 1st port P1, the 2nd port P2, and the 3rd port P3 which become an entrance / exit of a fluid in order toward the back end side from the front end side. . Moreover, the opening part opened to the edge part of the front end side in hollow interior is used as 4th port P4 used as the entrance / exit of a fluid.

  The spool 320 is fixed to the rod 240, and is configured to reciprocate together with the rod 240. The rod 240 is fixed by an adapter 322 fixed inside the spool 320. The adapter 322 includes a cylindrical portion 322a that is fitted to the outer periphery of the rod 240, and three claw portions 322b that protrude from the cylindrical portion 322a (see FIG. 3). These three claw portions 322 b are configured to fit on the inner peripheral surface of the spool 320. With such a configuration, the rod 240 and the spool 320 are fixed via the adapter 322. Further, since these three claw portions 322b are provided at intervals in the circumferential direction, a flow path from the front end side to the rear end side is secured on the inner peripheral surface side of the cylindrical spool 320. Is done.

  And the front end side of the spool 320 is comprised by the 1st large diameter part 323 with a larger outer diameter compared with the center part. Further, the rear end side of the spool 320 is constituted by a second large diameter portion 324 having an outer diameter larger than that of the first large diameter portion 323.

  An annular projecting portion 311 projecting toward the inner peripheral surface is provided in a region between the first port P1 and the second port P2 in the inner peripheral surface of the valve sleeve 310. The inner diameter of the annular protrusion 311 is designed to be equal to the outer diameter of the first large diameter part 323. When the spool 320 reciprocates, the outer peripheral surface of the first large diameter portion 323 is configured to slide on the inner peripheral surface of the annular projecting portion 311. Further, the first large diameter portion 323 is provided with a notch 323a in a part of the circumferential direction in the vicinity of the step with the central portion. With the above configuration, the spool valve portion SV is configured by the annular protrusion 311 on the inner peripheral surface of the valve sleeve 310 and the outer peripheral surface of the first large diameter portion 323 in the spool 320.

  A cylindrical metal first valve seat member 330 is provided in the hollow interior of the valve sleeve 310 on the tip side of the spool 320. The first valve seat member 330 includes a bellows portion 331, an annular support portion 332 provided integrally on the front end side of the bellows portion 331, and an annular shape provided integrally on the rear end side of the bellows portion 331. And a valve seat portion 333.

  The support portion 332 is fixed in a state where the outer peripheral surface thereof is in close contact with the inner peripheral surface of the valve sleeve 310. Further, the inner side of the inner peripheral surface 332a of the support portion 332 forms a flow path, and the opening portion serves as the above-described fourth port P4. The valve seat portion 333 has an outer peripheral surface portion 333 a on the rear end side thereof slidably provided on the inner peripheral surface of the valve sleeve 310. Moreover, the valve seat part 333 has the 1st seat surface 333b in the rear-end side. The first seat surface 333b is configured by a tapered surface whose diameter increases toward the rear end. The end portion 325 on the front end side of the spool 320 is configured to be seated and separated from the first seat surface 333b. The first poppet valve portion PV1 is configured by the first seat surface 333b and the end portion 325 on the front end side of the spool 320.

  In a region between the second port P2 and the third port P3 on the inner peripheral surface of the valve sleeve 310, a second seat surface 312 configured by a stepped surface facing the rear end side is provided. Further, as described above, the rear end side of the spool 320 is configured by the second large diameter portion 324 having a larger outer diameter than the center portion. Thus, a stepped surface 326 is formed on the outer peripheral surface of the spool 320 so as to face the front end side. The step surface 326 is configured to be able to be seated and separated from the second seat surface 312. The second poppet valve portion PV2 is configured by the second seat surface 312 and the step surface 326 of the spool 320.

  The cylindrical center post 230 described above is provided in the hollow interior of the valve sleeve 310 on the rear end side of the spool 320. The center post 230 is fixed in close contact with the inner peripheral surface of the valve sleeve 310. A third seat surface 233 is formed on the tip side of the center post 230. That is, the center post 230 plays a role as a second valve seat member. In addition, the 3rd seat surface 233 is comprised by the taper surface which expands as it goes to the front end side. An end 327 on the rear end side of the spool 320 is configured to be seated and separated from the third seat surface 233. The third poppet valve portion PV3 is configured by the third seat surface 233 and the end portion 327 on the rear end side of the spool 320.

  Note that O-rings O2, O3, O4, and O5 are mounted on the outer peripheral surface of the valve sleeve 310 to suppress fluid leakage to each flow path when the solenoid valve 100 is mounted at a predetermined mounting location. ing.

<Description of solenoid valve operation>
The operation of the solenoid valve will be described. Various usage modes are possible for the four ports described above. Here, a case where the first port P1 and the third port P3 are used as input ports, the second port P2 is used as an output port, and the fourth port P4 is used as a drain port will be described as an example.

  In a state where the coil 212 in the solenoid unit 200 is energized, the plunger 220 is magnetically attracted to the magnetic attracting surface 231 of the center post 230. Thereby, the rod 240 and the spool 320 move together with the plunger 220 to the front end side against the urging force of the spring 280 (see FIG. 1).

As a result, the stepped surface 326 of the spool 320 is seated on the second seat surface 312 provided on the inner peripheral surface of the valve sleeve 310. That is, the second poppet valve portion PV2 is in a closed state.

  Further, the end portion 325 on the front end side of the spool 320 is in a state of being seated on the first seat surface 333 b of the valve seat portion 333 in the first valve seat member 330. That is, the first poppet valve portion PV1 is also closed. At this time, since the first valve seat member 330 is pushed to the front end side by the end portion 325 on the front end side of the spool 320, the bellows portion 331 is in a compressed state.

  Further, the end portion 327 on the rear end side of the spool 320 is in a state of being separated from the third seating surface 233 of the center post 230. That is, the third poppet valve portion PV3 is in a state where the valve is opened.

  Further, the end portion of the first large diameter portion 323 of the spool 320 on the distal end side of the notch portion 323 a moves to the distal end side from the annular projecting portion 311 provided in the valve sleeve 310. As a result, the spool valve portion SV is in the open state.

  As described above, the flow path from the first port P1 as the input port to the second port P2 as the output port is opened, and the flow path from the first port P1 to the fourth port P4 as the drain port is blocked. . Further, the flow path from the third port P3 that is the input port to the second port P2 that is the output port is blocked, and the flow path that extends from the third port P3 to the fourth port P4 that is the drain port is opened. Therefore, the pressure (control pressure) of the fluid discharged from the second port P2 becomes the pressure of the fluid sent from the first port P1. In addition, the fluid sent from the 3rd port P3 is discharged | emitted from the 4th port P4 which is a drain port.

  In a state where the coil 212 in the solenoid unit 200 is not energized, the plunger 220 moves in a direction away from the magnetic adsorption surface 231 of the center post 230 by the biasing force of the spring 280. Thereby, the rod 240 and the spool 320 move to the rear end side together with the plunger 220 by the biasing force of the spring 280 (see FIG. 2).

  As a result, the end portion 325 on the front end side of the spool 320 is in a state of being separated from the first seat surface 333 b of the valve seat portion 333 in the first valve seat member 330. That is, the first poppet valve portion PV1 is in the open state. At this time, in the first valve seat member 330, since the pressing force from the end portion 325 on the front end side in the spool 320 is lost, the bellows portion 331 is extended to the original state.

  Further, the step surface 326 in the spool 320 is in a state of being separated from the second seat surface 312 provided on the inner peripheral surface of the valve sleeve 310. That is, the second poppet valve portion PV2 is in a state where the valve is opened.

  Further, the end portion 327 on the rear end side of the spool 320 is in a state of being seated on the third seating surface 233 of the center post 230. That is, the third poppet valve portion PV3 is in a closed state.

  Further, the first large diameter portion 323 of the spool 320 is in close contact with the inner peripheral surface of the annular projecting portion 311 over the entire circumference. Thereby, spool valve part SV will be in the state where the valve closed.

From the above, the flow path from the first port P1 as the input port to the second port P2 as the output port is blocked, and the flow path from the first port P1 to the fourth port P4 as the drain port is opened. . Further, the flow path from the third port P3 that is the input port to the second port P2 that is the output port is opened, and the flow path that extends from the third port P3 to the fourth port P4 that is the drain port is blocked. Therefore, the pressure (control pressure) of the fluid discharged from the second port P2 becomes the pressure of the fluid sent from the third port P3. In addition, the fluid sent from the 1st port P1 is discharged | emitted from the 4th port P4 which is a drain port.

<Excellent point of solenoid valve according to this embodiment>
Since the solenoid valve 100 according to the present embodiment includes four ports, it can be used as a multi-way valve. And since three places were made into poppet valve parts among four valve parts, the sealing performance of these valve parts can be improved. That is, generally, the poppet valve has higher sealing performance than the spool valve, and can improve the sealing performance of the first poppet valve portion PV1, the second poppet valve portion PV2, and the third poppet valve portion PV3.

  Here, in this embodiment, when the coil 212 in the solenoid unit 200 is energized, the flow path from the first port P1 to the second port P2 is opened. At this time, the first poppet valve portion PV1 and the second poppet valve portion PV2 are in a closed state. Therefore, when the control pressure discharged from the second port P2 as the output port is set to the pressure of the fluid sent from the first port P1 as the input port, the poppet valve is used for the accuracy of the pressure control. Can be made equivalent to

  Here, since the first valve seat member 330 can expand and contract in the moving direction of the spool 320, both the first poppet valve portion PV1 and the second poppet valve portion PV2 are closed at the same time while maintaining a high sealing property. It becomes possible. This point will be briefly described. If the first valve seat member 330 is not configured to be extendable / contractable, it is technically difficult to simultaneously close both the first poppet valve portion PV1 and the second poppet valve portion PV2. That is, in order to simultaneously close both valves, the distance from the end 325 of the spool 320 to the stepped surface 326 of the spool 320 and the distance from the first seating surface 333b to the second seating surface 312. If they are not equal, high sealing performance cannot be obtained. Therefore, high dimensional accuracy is required. On the other hand, in the present embodiment, the first valve seat member 330 can be expanded and contracted, so that high dimensional accuracy is not required.

(Other)
In the solenoid valve 100 shown in the above embodiment, if the third seating surface 233 can be configured to expand and contract in the moving direction of the spool 320, the spool valve portion can be a poppet valve portion.

DESCRIPTION OF SYMBOLS 100 Solenoid valve 200 Solenoid part 211 Bobbin 212 Coil 220 Plunger 221 Slit 230 Center post 231 Magnetic adsorption surface 232 Insertion hole 233 3rd seat surface 240 Rod 251, 252, Plate 253 Case 260 Bearing 270 Connector part 271 Terminal 280 Spring 300 Valve part 310 Valve sleeve 311 Annular protrusion 312 Second seat surface 320 Spool 321 Inner peripheral surface 322 Projection 323 First large diameter portion 323a Notch 324 Second large diameter portion 325 End portion 326 Step surface 327 End portion 330 First valve seat member 331 Bellows portion 332 Support portion 332a Inner peripheral surface 333 Valve seat portion 333a Outer peripheral surface portion 333b First seat surface P1 First port P2 Second port P3 Third port P4 Fourth port PV1 First poppet The valve unit PV2 second poppet valve PV3 third poppet valve SV spool valve portion

Claims (2)

A solenoid valve having a cylindrical spool that reciprocally moves in the valve sleeve by a solenoid;
The valve sleeve has three through-holes penetrating from the hollow interior to the side surface, and the openings to the side surfaces of these three through-holes are in order from the front end side to the solenoid on the rear end side. The first port, the second port, and the third port are used as fluid inlets and outlets, respectively, and the opening that opens at the end on the tip side in the hollow interior is used as the fourth port as the fluid inlet and outlet.
In the solenoid valve in which the spool valve portion is configured by the region between the first port and the second port in the inner peripheral surface of the valve sleeve and the outer peripheral surface of the spool,
A cylindrical first valve seat member provided on the tip side of the hollow inside of the valve sleeve and provided to be able to maintain a close contact with the inner peripheral surface of the valve sleeve; A first poppet valve portion is constituted by the first seat surface in the one valve seat member and the end portion on the front end side of the spool that can be seated and separated from the first seat surface,
A second seating surface formed of a stepped surface facing the rear end side provided in a region between the second port and the third port on the inner peripheral surface of the valve sleeve, and seated on the second seating surface And the second poppet valve portion is configured by a stepped surface that is provided so as to be separable and that is provided on the outer peripheral surface of the spool and faces the front end side,
A cylindrical second valve seat member provided on the rear end side of the hollow inside of the valve sleeve from the spool and provided so as to be able to maintain a close contact with the inner peripheral surface of the valve sleeve; A third poppet valve portion is configured by the third seat surface in the second valve seat member and the end portion on the rear end side of the spool that can be seated and separated from the third seat surface,
The first valve seat member is configured to be extendable and contractible in the moving direction of the spool. The first valve seat member is
A bellows portion that can be expanded and contracted in the moving direction of the spool;
An outer peripheral surface portion provided on the rear end side of the bellows portion and slidably provided on an inner peripheral surface of the valve sleeve; and a valve seat portion having a first seat surface on the rear end side. The solenoid valve according to claim 1, further comprising:

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