JPH08128555A - Solenoid valve - Google Patents

Abstract

PURPOSE: To provide a solenoid valve by which a valve element can be pressed onto a valve seat part with proper force so as to be surely locked while an excessive load is damped. CONSTITUTION: A lock member mechanism 5, by which a valve element 3 reciprocated by means of a solenoid 4 is forcibly pressed onto a valve seat 8 so as to be locked, is arranged, while an elastic member 15, by which the valve element 3 is pressed onto the valve seat 8 so as to be locked, is arranged in the lock mechanism 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, for example, and more particularly to a valve body forcibly locking mechanism.

[0002]

2. Description of the Related Art As a conventional solenoid valve of this type, there is one shown in FIG.

That is, a hollow valve body 100 and a valve body 101 movably provided inside the valve body 100.
And The valve body 101 can come into contact with a valve seat portion 102 inside the valve body 100, and is reciprocally driven by an electromagnetic actuator 103 having a solenoid.

[0004]

However, in the above-mentioned prior art, when an excessive negative pressure is applied from the lower portion of the valve body 101 even when the solenoid 0N is opened or closed, etc. In the case where it was necessary to urgently seal the valve body 101, the sealing was impossible.

In particular, when the valve is closed by no electromagnetic force, the spring 104 causes the valve body 101 to move the valve seat 101.
Although it is held down by 2, the pressing force is weak, so that the valve element 101 may be separated from the valve seat portion 102 due to vibration or the like, and the sealing performance may be deteriorated.

In order to solve such a problem, the load of the spring 104 may be increased, but the spring 1
The load of 04 is determined by the balance with the driving force of the electromagnetic actuator 103, and is naturally limited by the performance of the electromagnetic actuator.

Therefore, it is conceivable to insert a lock member separately from the outside of the valve body to forcibly lock the valve body 101. However, if the lock member is simply locked, an excessive external force acts on the lock member. , The external force is direct valve body 10
1 is transmitted to the valve body 101, and an excessive load is applied to the sealing surfaces of the valve body 101 and the valve seat 102, resulting in a decrease in durability.

In order to obtain the pressing force required for locking,
Accurate dimensional control such as the length of the lock member and the height of the valve body was required, which made the production cumbersome.

The present invention has been made to solve the above-mentioned problems of the prior art. The object of the present invention is to press the valve body against the valve seat portion with an appropriate force while absorbing an excessive load. An object of the present invention is to provide a solenoid valve that can be reliably locked.

[0010]

In order to achieve the above object, according to the present invention, a hollow valve body, a valve seat portion provided in the valve body, and a valve seat portion are provided. In a solenoid valve including a valve body that is movable toward and away from the valve body and an electromagnetic actuator that drives the valve body, a lock mechanism that forcibly presses and locks the valve body against a valve seat is provided. In addition, an elastic member that presses the valve body against the valve seat by a spring force to enable locking is provided.

The locking mechanism includes a rod that abuts the valve body,
It consists of a lock rod protruding outside the valve body,
The elastic member is interposed between the rod and the lock rod.

The lock mechanism includes a first lock member movable toward and away from the valve body, and presses and urges the valve body against the valve seat portion via the first lock member. First urging means, a second lock member provided on the opposite side of the valve body of the first lock member and movably assembled to the first lock member, and the second lock member. Second urging the locking member in a direction away from the first locking member
Urging means, and when the second lock member moves in a direction away from the valve body, the second lock member engages with each other between the first lock member and the second lock member. Move the first lock member and the second lock member integrally,
When the second lock member moves in a direction approaching the valve body, an engaging portion is provided that allows the first lock member and the second lock member to move independently.

The lock mechanism includes a lock member that can be inserted into and retracted from the outside of the valve body, and an insertion end portion of which can abut the valve body, and a biasing means that presses and biases the lock member against the valve seat. And a support member having a spring force that pushes back the insertion end portion of the lock member to a state in which it is separated from the valve body by a predetermined distance against the biasing force of the biasing means.

[0014]

According to the present invention, the valve element is pressed against the valve seat portion and locked by the spring force of the elastic member of the lock mechanism. Even if an excessive external load is applied to the valve element, it is buffered by the expansion and contraction of the elastic member, and the excessive load does not act on the valve seat portion.

In the lock mechanism according to the third aspect, when a load is applied to the second lock member from the outside, the second lock member resists the urging force of the second urging means. Moves to the valve body side. Since the first lock member is biased toward the valve body by the biasing force of the first biasing means, it moves to the valve body side like the first lock member. Then, when the stroke exceeds a certain value, the first lock member comes into contact with the valve body, and the valve body is pressed against the valve seat portion to seal.
Since this pressing force is determined by the biasing force of the first biasing means, it can be set regardless of the external force pushing the second lock member.

Further, even if the stroke amount of the external force pushing the second lock member is excessive, if the first lock member comes into contact with the spacer, even if the second lock member makes a stroke thereafter, the first lock member is stroked. The lock member is immovable and pushes the valve body only by the load of the second spring.

By installing the first and second lock members as described above, it becomes possible to press and fix the valve body to the valve seat portion to seal the valve body when necessary, and particularly, the first lock member and the second lock member. Since the members are separated and the valve body is pressed by the second biasing means, the pressing force of the valve body can be alleviated and the stroke tolerance of the second lock member from the outside can be absorbed.

Further, in the case of the lock mechanism according to the fourth aspect, when an external force is applied to the support member to push the support member against the spring force of the support member, the lock member pushed back by the support member is urged by the biasing means. Is pushed inside the valve body, and the valve body is pressed against the valve seat by the insertion end of the lock member.
This pressing force is determined only by the urging force of the urging means regardless of the external force, and an excessive load is not applied between the contact portion between the valve body and the valve seat.

When the external force is removed, the spring force of the support member pushes the lock member back against the biasing force of the biasing means, and the insertion end of the lock member is separated from the valve body by a predetermined distance.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

In FIG. 1 showing a solenoid valve according to a first embodiment of the present invention, reference numeral 1 denotes the entire solenoid valve as a solenoid valve, and generally, a hollow body 2 as a valve body.
And a valve seat portion 8 provided in the body 2 and the valve seat portion 8
A plunger 3 as a valve body 3 which can be brought into and out of contact with the solenoid 3 and a solenoid portion 4 as an electromagnetic actuator for driving the plunger 3 which is assembled to the body 2.
And a lock bar 5 that locks the plunger 3 by pressing it against the valve seat portion 8.

First and second flow paths 6 and 7 are provided inside the body 2, and the valve seat portion 8 is provided at the opening of the first flow path 6 inside the body 2.

The solenoid portion 4 is integrally assembled with the body 2, and includes a center post 11 as a fixed iron core arranged to face the valve seat portion 8 and a coil 12 arranged so as to surround the center post 11. By exciting the coil 12, the plunger 3 is electromagnetically attracted to the end surface of the center post 11. An upper plate 41 is provided on the outer end surface side of the center post 11, and a lower plate 42 is provided at a position facing the upper plate 41 with the coil 12 in between. The upper plate 41 and the lower plate 42 are connected by a yoke portion (not shown) to form a magnetic path.

A plunger spring 13 for urging the plunger 3 against the valve seat portion 8 is interposed between the plunger 3 and the center post 11. The plunger spring 1
It is always closed by the spring force of 3.

On the other hand, when the valve is opened, as shown in FIG. 1B, the plunger 3 is electromagnetically attracted against the spring force of the plunger spring 13 to separate it from the valve seat 8.

The lock rod 5 is inserted from the outer end surface of the center post 11 through a through hole 14 penetrating the center axis of the center post 11. The tip of the lock rod 5 is provided with a buffer spring 15 as an elastic member. Plunger 3
Is in contact with The buffer spring 15 is inserted into a recess 16 provided in the plunger 3 and is in contact with the tip of the lock rod 5 via a shim 17. The lock mechanism is configured by the lock bar 5, the shim 17, and the buffer spring 15. The shim 17 is provided for the purpose of preventing the magnetic flux from becoming infinite.

Further, the outer opening of the through hole 14 is enlarged in diameter to form a large diameter hole portion 18, and the lock rod 5 is provided with a piston portion 19 which is slidably contacted with the inner circumference of the large diameter hole portion 18. There is. A seal member 2 such as an X ring is provided on the outer circumference of the piston portion 19.
A zero is provided to ensure the seal. Further, the piston portion 19 also functions as a stopper for preventing the piston from coming off.
The upper plate 41 that closes the large-diameter hole 18 is engaged with the upper plate 41 to prevent the large-diameter hole 18 from coming off. On the other hand, one end of the lock rod 5 projects outward from the end surface of the upper plate 41 by a predetermined dimension.

Further, a lock rod return spring 22 is interposed between the inner end surface of the piston portion 19 and the step portion 21 of the large diameter hole portion 18, and the piston portion 19 is fixed to the upper plate 4.
1 is pressed and urged.

In this way, the buffer spring 15 is arranged between the plunger 3 and the shim 17, and the buffer spring 15
The shim 17 prevents the plunger 3 and the lock rod 5 from directly contacting each other. As a result, the valve pressing force of the lock rod 5 is attenuated when locked.

In the solenoid valve having the above construction, FIG.
When the valve is opened as shown in Fig. 1 or when the valve is closed as shown in Fig. 1 (a), an excessive negative pressure is applied from the lower part of the plunger 3 or vibration is large. When it becomes necessary to seal 3, the plunger 3 is pressed against the valve seat 8 and locked by pushing in the protruding end of the lock rod 5, as shown in FIG.

In the present embodiment, the buffer spring 15 is arranged between the plunger 3 and the shim 17 so that the plunger 3 and the lock rod 5 do not come into direct contact with each other by the buffer spring 15 and the shim 17. So lock stick 5
Even if an excessive external load acts on the buffer spring 15
It is buffered by expansion and contraction, and an excessive lock load does not act on the plunger 3.

Further, since it is considered that the shock-absorbing spring 15 has a small load displacement within the dimensional tolerance range of the parts, the dimensional tolerances of the length of the lock rod 5, the height of the plunger 3 and the thickness of the shim 17 are sufficiently large. Can be absorbed,
Forcibly, the dimensional tolerance of parts can be expanded to facilitate manufacturing.

The amount of pushing is the maximum stroke until the lower end surface of the piston portion 19 comes into contact with the step portion 21, but it may be pushed up by the maximum stroke, or may be pushed to an intermediate position where it does not come into contact with the step portion 21. You may

The positional relationship between the shim 17 and the plunger 3 in the locked position may be set so that the shim 17 does not come into contact with the plunger 3 or may come into contact with the plunger 3. . Even if the shim 17 finally comes into contact with the plunger 3, an excessive load does not act on the plunger 3 because the external load is buffered by the buffer spring 15 in the middle thereof.

FIG. 3 shows variations of shim shapes.

FIG. 3A shows an example of the flat shim 17.

Shims 171 and 172 shown in FIGS.
Is a cross-sectional hat shape, and is an example in which they are arranged in mutually opposite directions.

FIGS. 4 (a) and 4 (b) show the buffer spring 15
Is omitted, and an elastic material shim 173 having a slight thickness or a thin elastic material shim 174 is used as the elastic member.
This is an example in which the external force is buffered by the elasticity of the shims 173 and 174 themselves.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention. Hereinafter, the same components as those in the first embodiment will be designated by the same reference numerals to describe the present embodiment.

In this embodiment, the buffer spring 15 is omitted, and the shim 17A is held in contact with the plunger 3 so that the opening end of the recess 16 is closed.

Further, the lock mechanism 50 includes the center post 1
Large-diameter hole portion 18A having no step portion 21 formed in 1A
Lock rod 5 having a piston portion 19A that slidably contacts the inner circumference of the lock rod 5
1 and shim 17A on the plunger 3 connected by the piston portion 19A via the spring 23 which is an elastic member.
And a rod 52 that abuts via.

The piston portion 19A has a piston recess 19B which opens on the side of the plunger 3 on the central axis. On the other hand, the rear end of the rod 52 has a radially outward flange portion 52A.
However, the rod 52 is held by the lock rod 51 by being inserted into the piston concave portion 19B and being locked to the locking portion 19C provided at the opening end thereof.

The spring 23 is inserted in the piston recess 19B, one end of which abuts on the rear end surface of the rod 52 and the other end of which abuts on the bottom surface of the piston recess 19B, and the flange 52A of the rod 52 is formed. It is pressed and urged so as to come into contact with the locking portion 19C.

As described above, in this embodiment, the rod 52 is brought into contact with the shim 17A, and only the spring 23 receives the load on the valve seat portion 8. Further, by reducing the spring constant of the spring 23, the load on the valve seat portion 8 can be suppressed as much as possible even if the stroke of the lock rod 51 increases. As a result, the valve pressing force of the lock member 50 is attenuated when locked.

Further, since it is considered that the spring 23 has a small load displacement within the dimensional tolerance range of the parts, the length of the lock rod 51, the height of the plunger 3, the shim 1
It is possible to absorb variations in the stroke of the lock rod 51 caused by dimensional tolerances such as the thickness of 7A and dimensional tolerances of the mounting portion of the solenoid portion 4, and forcibly, the dimensional tolerances of the parts can be expanded to facilitate manufacture.

Since the other structure and operation are the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

(Third Embodiment) Next, a third embodiment of the present invention will be described.

In FIG. 1 showing a solenoid valve according to a third embodiment of the present invention, reference numeral 301 denotes the solenoid valve as a solenoid valve as a whole, which is generally a hollow body 302 and a movable body 302. A plunger 303 as a valve body provided, a solenoid portion 304 as an actuator assembled to the body 302, and a body 30.
2, a lock mechanism 305 which is inserted into the body 302 through the solenoid 304 and locks the plunger 303 in this embodiment. The body 302 and the solenoid portion 304 constitute the valve body of the present invention.

Inside the body 302, the first and second flow paths 30 are provided.
6, 307 are provided, and a valve seat portion 308 with which the plunger 303 abuts is provided in an opening portion inside the body 302 of one of the first flow paths 306.

The solenoid portion 304 is integrally assembled with the body 302, and has a center post 311 as a fixed iron core arranged to face the valve seat portion 308, and a coil 31 arranged so as to surround the center post 311.
2 and electromagnetically attracts the plunger 303 to the end surface of the center post 311 by exciting the coil 312. An upper plate 341 is provided on the outer end surface side of the center post 311 and a lower plate 342 is provided at a position facing the upper plate 341 with a coil 312 therebetween. The upper plate 341 and the lower plate 342 are connected by a yoke portion (not shown) to form a magnetic path.

A plunger spring 313 for biasing the plunger 303 against the valve seat 308 is interposed between the plunger 303 and the center post 311 and is closed by the spring force of the plunger spring 313. On the other hand, when the valve is opened, the plunger spring 31
The plunger 303 is electromagnetically attracted and separated from the valve seat portion 308 against the spring force of No. 3. One end of the plunger spring 313 comes into contact with the plunger 303 via a spacer 314 for opening a predetermined space between the center post 311 and the plunger 303 during electromagnetic attraction. A recess 316 is formed on the end surface of the plunger 303 on the side opposite to the valve seat portion.

The lock mechanism 305 is a retainer 317 as a first lock member that is movable in a direction to move toward and away from the plunger 303, and presses the plunger 303 against the valve seat portion 308 via this retainer 317. A first spring 318 as a first urging means for urging, and a lock rod 319 as a second lock member which is provided on the side opposite to the plunger of the retainer 317 and is movably assembled to the retainer 317. , This lock stick 31
And a second spring 320 as a second urging unit that urges 9 in a direction away from the retainer 317.

Further, between the retainer 317 and the lock rod 319, when the lock rod 319 moves in the direction away from the plunger 303, they are engaged with each other so that the retainer 317 and the lock rod 319 are integrally moved to lock. Stick 3
An engaging portion 321 is provided to allow the retainer 317 and the lock rod 319 to move independently of each other when the plunger 19 moves toward the plunger 303.

The center post 311 is formed with a through hole 322 penetrating from the outside to the inside along the central axis thereof. The through hole 322 has a stepped structure that is enlarged in three steps from the outer end surface side of the center post 311. The through hole 322 has a lock rod guide portion 323 for guiding the lock rod 319 open to the outer end surface of the center post 311 and a retainer 317. The central retainer guide portion 324 for guiding and the plunger 3
It is configured by a spring guide portion 325 which is open to the 03 side and into which the above-mentioned plunger spring 313 and the first spring 318 are inserted.

The retainer 317 has a hollow hole 326 inside.
An annular spring seat 327 that engages with one end of the first spring 318 is projectingly formed on the outer periphery of the plunger-side opening end of the cylindrical member. The spring seat 327 faces the annular step portion 328 at the inner end of the spring guide portion 325 formed on the center post 311 with a predetermined distance therebetween, and the first spring 318 described above and the spring seat 327 and the step portion. It is interposed in a compressed state with 328. The first spring 318 has a smaller diameter than the plunger spring 313, and has an inner circumference of the plunger spring 313 and a retainer 317.
It is inserted in an annular space with the outer circumference.

Further, the plunger 303 of the retainer 317
The plunger side end of the lock rod 319 is slidably inserted into the opening end opposite to the opening end, and the inward annular convex portion 3 constituting the engaging portion 321 with the lock rod 319 is slidably inserted inside the opening end.
29 is formed, and at the lower end of the lock rod 319, an outward annular protrusion 330 that engages with the end surface of the inward annular protrusion 329 on the plunger side is formed.

The lock rod 319 is inserted into the lock rod guide portion 323 of the center post 311 from the outside, and a disk-shaped spring retainer 331 is provided at the outer end portion thereof. The spring retainer 331 and the upper plate 341 are provided.
The second spring 320 is interposed in the compressed state. And in the free state, this second spring 3
The lock rod 319 is urged in the direction of coming out of the valve body by the spring force of 20, and the retainer 3 is urged through the engaging portion 321.
The end portion of the non-plunger side 17 is abutted against the stepped portion 332 at the rear end of the retainer guide portion 324 to position and hold it.

The sliding surface between the lock rod 319 and the lock rod guide portion 323 is sealed by a seal member 333 such as an X ring.

When a load is applied to the lock rod 319 from the outside, the lock rod 319 resists the second spring 320.
Moves downward toward the plunger 303 side. The retainer 317 locks the lock rod 31 by the first spring 318.
Since it is pressed against the lower end of 9, it moves downward like the lock bar 319. Then, when the stroke exceeds a certain value, the lower end of the retainer 317 pushes the plunger 303 via the spacer 314 to move the plunger 303 to the valve seat portion 30.
8 will be pressed and sealed.

Since this pressing force is determined by the set load and spring constant of the first spring 318, it can be set regardless of the external force for pressing the lock rod 319.

Even if the stroke amount of the external force pushing the lock rod 319 is excessive, if the lower end of the retainer 317 hits the spacer 314, the retainer 317 remains stationary even if the lock rod 319 makes a stroke thereafter. Plunger 303 only by the load of spring 318
Will be pressed.

(Fourth Embodiment) FIGS. 7 to 9 show a fourth embodiment of the present invention.

In FIG. 7 and FIG. 8, reference numeral 1 denotes the whole solenoid valve, which is roughly a hollow body 402, a plunger 403 as a valve body movably provided in the body 402, and an assembly to the body 402. The solenoid 404 as an actuator and the outside of the body 402, in this embodiment the solenoid 404, is used to
02, and a lock rod 405 for locking the plunger 403. Body 40 above
2 and the solenoid 404 form the valve body of the present invention.

Inside the body 402, the first and second flow paths 40 are provided.
6, 407 are provided, and a valve seat 408 with which the plunger 403 abuts is provided at the opening of the one first flow passage 406 inside the body 402. A seal member 434 such as rubber is baked on the contact portion between the plunger 403 and the valve seat 408.

The solenoid 404 is integrally assembled to the body 402, and has a center post 411 as a fixed iron core arranged to face the valve seat 408 and a coil 412 arranged so as to surround the center post 411. Then, by exciting the coil 412, the plunger 403 is electromagnetically attracted to the end surface of the center post 411. An upper plate 441 is provided on the outer end surface side of the center post 411, and a lower plate 442 is provided at a position facing the upper plate 441 with a coil 412 in between. The upper plate 441 and the lower plate 442 are connected by a yoke portion (not shown) to form a magnetic path.

A plunger spring 413 for biasing the plunger 403 against the valve seat 408 is interposed between the plunger 403 and the center post 411, and is closed by the spring force of the plunger spring 413.
On the other hand, when the valve is opened, the plunger 403 is electromagnetically attracted against the spring force of the plunger spring 413 and the valve seat 40
It is designed to be separated from 8.

The lock rod 405 passes through the center hole of the center post 411 through a guide hole 414 which penetrates the center axis of the center post 411.
11 is inserted from the outer end surface. Guide hole 414
Has a stepped structure in which the outer opening and the inner opening are both expanded in diameter to form first and second large diameter hole portions 415 and 416. On the other hand, the lock rod 405 is a rod-shaped member in which a large-diameter piston portion 417 is provided in the middle, and the first large-diameter hole portion 41 in which the piston portion 417 is located in the outer opening portion.
5 is slidably inserted in the inner circumference. An elastic seal member 418 such as an X ring is provided on the outer circumference of the piston portion 417 of the lock rod 405 to ensure airtightness. An end portion 419 of the lock rod 405 in the insertion direction has a small diameter and protrudes through a guide hole 414 into a second large-diameter hole portion 416 that opens to the inner end surface of the center post 411 so as to face the plunger 403. On the other hand, the protruding end 421 on the opposite side of the lock rod 405 also has the same small diameter as the end 419 in the insertion direction and protrudes outward from the central hole 422 formed in the upper plate 441.

Between the piston portion 417 inserted into the first large diameter hole portion 415 and the upper plate 441, a pressing spring 423 as a biasing means for pressing the lock rod 405 against the valve seat 408 is provided. It is inserted in a compressed state.

Further, in the present invention, the coil spring which constitutes the supporting means for pushing back the insertion end portion 419 of the lock rod 405 to the state separated from the plunger 403 by a predetermined distance against the biasing spring force of the pressing spring 423. 424 and a spring retainer 425 are provided.
Further, a spring retainer 425 is provided on the upper end of the lock rod 405.
A pin 426 that is slidable in the axial direction is provided with the inner circumference of the as a guide. The pin 426 and the lock rod 405 are fixed and integrated with a screw or the like.

Spring retainer 425 and upper plate 4
The movement of the pin 426 is determined by the set distance of 41.

When the plunger 403 is locked, as shown in FIG. 9 (a), the spring retainer 425 is
When an external force is applied to the upper end of the coil spring 425 against the spring force of the coil spring 425, the plunger 403 is pushed against the valve seat 408 by the insertion end 419 of the lock rod 405 that has been pushed back by the spring force of the coil spring 425. Is pressed.

This pressing force is determined only by the spring force of the pressing spring 423 regardless of the external force, and an excessive load is not applied between the contact portion between the plunger 403 and the valve seat 408. When the external force is removed, the spring force of the coil spring 424 pushes the lock rod 405 back against the spring force of the pressing spring 423, and the insertion end 419 of the lock rod 405 is separated from the plunger 403 by a predetermined distance.

As described above, the elastic seal member 418 is mounted on the sliding portion of the lock rod 405, the pressing spring 423 is mounted between the mounting portion step and the upper plate 441, and the lock rod protruding from the solenoid is projected. Edge 4
21 and the pin 426, the coil spring 424 and the spring retainer 425 were installed.

As a result, the airtightness of the inside of the solenoid can be secured, and the durability can be improved without applying an excessive external force to the plunger 403. Furthermore, when the external force is removed, the lock bar 405 can return to the predetermined position.

Further, by incorporating the sleeve 427 in the center post 411 as the return stopper of the lock rod 405, the coil spring 424 and the pressing spring 4 are provided.
Not only in the 23 well-balanced places, but also in the initial lock rod 40
It becomes possible to determine the setting position of 5.

[0076]

The present invention has the above-described structure and operation. When the load for pressing the valve body becomes excessive, it can be buffered by the buffer means, so that the valve seat portion is worn and the seal is defective. It is possible to improve durability without fear of causing

Further, it is possible to absorb the dimensional error of the lock member and the valve body and the like, which facilitates the manufacture.

Further, by installing the first and second lock members, the valve body can be pressed and fixed to the valve seat portion and sealed when necessary.

Particularly, since the first lock member and the second lock member are separated and the valve body is pressed by the second biasing means, the pressing force of the valve body is reduced and the second external force is applied. The stroke tolerance of the lock member can be absorbed.

Further, by providing a supporting member having a spring force that pushes back the insertion end portion of the lock member to a state in which it is separated from the valve body by a predetermined distance against the biasing force of the biasing means,
Since the pressing force of the valve body is determined only by the urging force of the urging means regardless of the external force, it is possible to prevent an excessive load from being applied between the valve body and the valve seat, and to improve the durability.

[Brief description of drawings]

FIG. 1 (a) is an overall vertical cross-sectional view of a solenoid valve according to a first embodiment of the present invention in a closed state, and FIG. 1 (b) is a partial cross-sectional view of the valve open state.

2 is an overall vertical cross-sectional view of the solenoid valve of FIG. 1 in a locked state.

3 (a), (b), and (c) are cross-sectional views of essential parts showing various variations of shim shapes.

FIG. 4 (a) is a cross-sectional view of a solenoid valve showing an example in which the shim itself is provided with spring elasticity, and FIG. 4 (b) is a cross-sectional view of a main part of a locked state of the thin shim example. is there.

5 (a) is an overall vertical cross-sectional view of a solenoid valve according to a second embodiment of the present invention, and FIG. 5 (b) is a cross-sectional view of essential parts in a locked state.

6 (a) is an overall vertical cross-sectional view of a solenoid valve according to a third embodiment of the present invention, and FIG. 6 (b) is a cross-sectional view of essential parts in a locked state.

7 (a) is an overall longitudinal sectional view of a solenoid valve in a locked state according to a fourth embodiment of the present invention, and FIG. 7 (b) is a top view of FIG. 7 (a).

FIG. 8 is an enlarged view of a main part of FIG. 7 (a).

9 (a) is a diagram showing the locked state of FIG. 7 (a), and FIG. 9 (b) is a vertical cross section of the solenoid valve of FIG. 7 (a) fitted with a sleeve as a lock rod return stopper. It is a figure.

FIG. 10 is an overall vertical sectional view of a conventional solenoid valve.

[Explanation of symbols]

 1 Solenoid Valve 2 Body (Valve Main Body) 3 Plunger (Valve Body) 4 Solenoid Part 41 Upper Plate 42 Lower Plate 5 Lock Rod (Lock Member) 6 First Flow Path 7 Second Flow Path 8 Valve Seat 11, 11A Center Post 12 coil 13 1st spring 14 through hole 15 buffer spring (elastic member) 16 recessed part 17,171,172,173,174 shim 18,18A large diameter hole part 19,19A piston part 19B piston recessed part 19C locking part 20 seal Member 21 Stepped portion 22 Lock rod return spring 23 Spring (elastic member) 50 Lock member 51 Lock rod 52 Rod 52A Flange portion 301 Solenoid valve 302 Body (valve body) 303 Plunger (valve body) 304 Solenoid 341 Upper plate 342 Lower plate 305 Lock bar (lock member) 306 First flow path 307 Second flow path 308 Valve seat portion 311 Center post 312 Coil 313 Plunger spring 314 Spacer 315 Retainer 316 Recess 317 Retainer (first lock member) 318 First spring 319 Lock bar (second lock member) 320 Second spring 321 Engagement part 322 Through hole 323 Lock bar guide part 324 Retainer guide part 325 Spring guide part 326 Hollow hole 327 Spring seat 328 Step part 329 Inward annular convex part 330 Outward annular protrusion 331 Spring retainer 332 Step 333 Seal member 401 Solenoid valve 402 Body (valve body) 403 Plunger (valve body) 404 Solenoid 441 Upper plate 442 Lower plate 405 Lock bar (lock member) 406 First flow path 407 Second flow path 408 Valve seat 411 Center post 412 Coil 413 Plunger spring 414 Guide hole 415 First large diameter hole portion 416 Second large diameter hole portion 417 Piston portion 418 Seal member 419 Inserting end 421 Projecting end 422 Central hole 423 Pressing spring (biasing means) 424 Coil spring 425 Spring retainer 426 Pin 427 Sleeve

Claims (4)

[Claims] 1. A hollow internal valve body, a valve seat portion provided inside the valve body, a valve body provided so as to be movable toward and away from the valve seat portion, and an electromagnetic actuator for driving the valve body. When,
In the solenoid valve provided with, a lock mechanism for forcibly pressing and locking the valve body against the valve seat is provided, and the lock mechanism is provided with an elastic member for pressing the valve body against the valve seat by a spring force to enable locking Solenoid valve characterized by 2. The lock mechanism comprises a rod that abuts against the valve body and a lock rod that projects to the outside of the valve body, and the elastic member is interposed between the rod and the lock rod. The solenoid valve according to claim 1, wherein: 3. A lock mechanism comprising: a first lock member that is movable in a direction of approaching and separating from a valve body, and the valve body that presses the valve body against the valve seat portion via the first lock member. A first urging means for urging, and a first urging means provided on the side of the first lock member opposite to the valve body,
A second lock member that is mounted so as to be relatively movable with respect to the lock member, and second biasing means that biases the second lock member in a direction away from the first lock member, Between the first lock member and the second lock member, when the second lock member moves in the direction away from the valve body, they engage with each other and the first lock member and the second lock member. An engaging portion is provided which moves the members integrally and allows the first lock member and the second lock member to move independently when the second lock member moves in a direction approaching the valve body. The solenoid valve according to claim 1, wherein the solenoid valve is provided. 4. A lock mechanism comprising: a lock member that is inserted into and retracted from the outside of the valve body and an insertion end portion of which can abut against the valve body; A biasing means and a supporting member having a spring force that pushes the insertion end of the lock member back to a state in which it is separated from the valve body by a predetermined distance against the biasing force of the biasing means. The solenoid valve according to claim 1.