JPH0547631U - Control valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the retention of high fluid pressure without increasing the size of the actuator and to improve the durability. A protrusion 12 is provided in the contact surface between the valve seat 8 and the elastic member 11 provided on the valve body 3 so as to partially increase the surface pressure so as to surround the opening of the flow passage 9. . The protrusion may be provided on the valve seat 8 side or the elastic member 11 side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control valve used for various hydraulic / pneumatic control, for example.

[0002]

[Prior Art]

 A conventional control valve of this type is shown in FIG. That is, this control valve is a solenoid valve, and a valve body 102 is reciprocally inserted into the inner circumference of a cylindrical coil 101 of the solenoid valve 100, and the end face of the valve body 102 is made of rubber or the like. The elastic member 103 is provided. The spring force of the spring 105 provided between the valve body 102 and the center post 104 as a fixed core provided coaxially with the valve body 102 causes the valve seat 106 provided in the valve box to move. They are in contact with each other and are separated from the valve seat 106 by utilizing the electromagnetic attraction force of the solenoid to open and close the flow path 107 opening to the valve seat 106.

Then, in order to maintain a high fluid pressure, as shown in FIG. 5, the pressing force P of the valve body 102 against the valve seat 106, that is, the spring force of the spring 105 is increased, and the elastic member 103 and the valve seat are closed. For example, the surface pressure with 106 is increased, or the contact area between the valve seat 106 and the elastic member 103 of the valve body 102 is reduced.

[0004]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, when the pressing force P for maintaining a high fluid pressure, that is, the spring force of the spring 105 is increased, the solenoid as the actuator is actuated as the spring force of the spring 105 increases. The attraction force must also be increased, and the solenoid used as an actuator will become larger.

Further, when the contact area between the valve seat 106 and the elastic member 103 of the valve body 102 is reduced, the cross-sectional area of the valve seat 106 becomes smaller as shown in FIG. There is a problem that the stability of 102 is reduced and the durability of the contact portion of the elastic member 103 with the valve seat 106 is reduced due to wear or abrasion.

The present invention was made in order to solve the above-mentioned problems of the prior art. The purpose of the present invention is to improve the retention of high fluid pressure without increasing the size of the actuator and to improve the durability. It is to provide a control valve capable of improving the property.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, a control valve that opens and closes a flow path opening to a valve seat by contacting and separating an elastic member such as rubber provided on the end surface of the valve body with the valve seat. In the contact surface between the valve seat and the elastic member, a protrusion is provided so as to partially increase the surface pressure so as to surround the flow path opening.

The protrusion may be provided on the valve seat side or the elastic member side of the contact surface between the valve seat and the elastic member.

[0009]

[Action]

 In the control valve having the above-described configuration, the protrusion is provided so as to surround the flow passage opening in the contact surface between the valve seat and the elastic member such as rubber on the end face of the valve body. The surface pressure increases by the amount. Further, since the elastic member and the valve seat are held in contact with each other in the region where the protrusion is not provided, the stability of the valve body is not impaired and the elastic member is prevented from being worn out or worn away as in the conventional case. Therefore, the retention of high fluid pressure is improved and the durability is improved.

Further, for the same control pressure, the actuator for moving the valve body can be downsized.

[0011]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 and 2 showing a control valve according to an embodiment of the present invention, reference numeral 1 denotes the entire solenoid valve as a control valve, which is a solenoid 2 as a schematic actuator and is reciprocally driven by the solenoid 2. A plunger 3 as a valve body and a valve box 4 integrally assembled with the solenoid 2 are mounted in the holes of the mating mounting member 14.

The solenoid 2 includes a coil 5 formed into a tubular shape, and a center post 6 that is inserted and fixed to the inner periphery of the hollow hole 51 of the coil 5 from one end face side to a midway portion thereof. An opening at the other end of the hollow hole 51 is continuously connected to a drain port 7 which is provided in the valve box 4 so as to penetrate in the radial direction. A valve seat 8 provided in the valve box 4 is arranged to face the end surface of the center post 6, and the plunger 3 is reciprocally inserted between the center post 6 and the valve seat 8.

A channel 9 is opened in the valve seat 8, and the valve is opened and closed by opening and closing the opening of the channel 9 by the plunger 3.

Further, the plunger 3 side of the center post 9 has a U-shaped cross section that opens toward the plunger 3 side, and a spring 10 is inserted therein, and one end of the spring 10 closes the center post 6. The end face and the other end contact the end face of the plunger 2, respectively, and urge the plunger 3 toward the valve seat 8 side.

On the other hand, the plunger 3 is composed of a large-diameter portion 31 and a small-diameter portion 32, the outer periphery of the large-diameter portion 31 is slidably inserted into the inner periphery of the hollow hole 51 of the coil 5, and the end face of the small-diameter portion 32 is inserted. An elastic member 11 having a rectangular cross section, such as rubber, is coupled to the rubber.

Further, a step portion 12 as a protrusion is provided around the entire circumference so as to surround the opening of the flow path 9 opened to the valve seat 8. The step portion 12 is from the opening end of the flow path 9 to the outside in the radial direction of the air, has a small height, the corner portions are substantially right angles, and the end surface of the step portion 12 is a plane and annular.

When the solenoid valve 1 is in the free state, the plunger 3 is pressed against the valve seat 8 by the spring force of the spring 10 interposed between the center post 6 and the plunger 3, and is kept closed. When the elastic member 11 is pressed against the valve seat 8 in this manner, the contact area is reduced by the step portion 12, so that the surface pressure is increased and the elastic member 11 is contracted according to the surface pressure. The portion 11 is in contact with the end surface of the valve seat 8 other than the stepped portion 12.

At this time, if the height of the step portion 12 is too low, the end surface of the valve seat 8 approaches a flat surface, and immediately when the elastic member 11 contacts the step portion 12, the end surface of the valve seat 8 other than the step portion 12 is immediately contacted. Since they come into contact with each other, the actual contact area is not reduced, and the surface pressure cannot be increased. On the contrary, if it is too high, the contact portion between the elastic member 11 and the step portion 12 becomes fatigued or the durability is deteriorated due to abrasion or the like. Further, if the diameter of the step portion 12 is too large with respect to the diameter D of the flow passage 9 opening to the valve seat 8, the actual contact area is not reduced and the surface pressure cannot be increased.

Therefore, when an experiment was conducted to determine an appropriate dimension of the step portion 12, as shown in FIG. 2B, the value was about 0.01 mm to 0.05 mm for the height A of the step portion 12. The maximum diameter B is 1.5 times or less the diameter D of the flow passage 9 of the valve seat 8, and the diameter C of the valve seat 8 is about twice or more the diameter D 1 of the flow passage 9.

On the other hand, when the coil 5 is energized, the center post 6 is excited, and the plunger 3 moves by being magnetically attracted to the center post 6 side against the spring force of the spring 10 interposed between the center post 6 and the plunger 3. Then, the plunger 3 is separated from the valve seat 8 and opened.

In the control valve having the above structure, the opening of the flow passage 9 of the valve seat 8 is surrounded by the contact surface between the valve seat 8 and the elastic member 11 such as rubber provided on the end surface of the plunger 3. Since the step portion 12 is provided, the contact area is reduced by the step portion 12 to increase the surface pressure, and the elastic member 11 is held on the end surface of the valve seat 8 other than the step portion 12, so that the stability of the plunger 3 is improved. Is not spoiled, and the elastic member 11 is prevented from sagging or wearing as in the conventional case. Therefore, retention of high fluid pressure is improved and durability is improved.

Further, for the same control pressure, a small amount of current is passed through the solenoid 2 as an actuator, so that the solenoid 2 as an actuator can be downsized.

FIG. 3 shows another embodiment of the present invention. In the above-described embodiment, the protrusion is the stepped portion 12, but in this embodiment, the stepped portion 12 is the protrusion 13 having a shape with an angle E. Since other configurations and operations are the same as those in the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.

In each of the above embodiments, the protrusion is provided on the valve seat 8 side as an example, but it may be provided on the elastic member 11 side or both, and the shape of the protrusion is also different. Instead of the stepped portion 12 or the like, a continuous or discontinuous projection may be provided so as to simply surround the opening of the flow path 9, and various embodiments can be implemented without departing from the gist of the present invention. ..

Further, the actuator using the solenoid 2 as the actuator for driving the valve element has been described as an example, but the means for driving the valve element is not limited to the solenoid, and other fluid pressure such as hydraulic pressure is used. The same applies to those that do.

[0026]

[Effect of the device]

 The present invention has the above-described configuration and operation, and projects the flow path opening to the valve seat in the contact surface between the valve seat and the elastic member such as rubber provided on the end surface of the valve body so as to surround the opening. Since the protrusion is provided, the contact area is reduced due to the protrusion, the surface pressure is increased, and since the elastic member and the valve seat are held on the surface other than the protrusion, the stability of the valve body is not impaired and the Elimination of wear or the like of the elastic member is eliminated. Therefore, the retention of high fluid pressure can be improved and the durability can be improved.

Further, for the same control pressure, the actuator for moving the valve body can be downsized.

[Submission date] August 12, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction content]

In each of the above embodiments, the protrusion is provided on the valve seat 8 side as an example, but it may be provided on the elastic member 11 side or on both sides, and the shape of the protrusion is also different. Instead of the stepped portion 12 or the like, an annual ring-shaped protrusion may be provided so as to simply surround the opening of the flow path 9, and it can be implemented in various modes without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 (a) is a longitudinal sectional view of a main part showing a valve body and a valve seat of a control valve according to an embodiment of the present invention, and FIG. 1 (b) is the same view.
It is a longitudinal cross-sectional view showing the dimensions of the stepped portion of the valve seat of (a).
(c) is a top view of the same figure (b).

FIG. 2 is an overall vertical cross-sectional view in which the control valve of FIG. 1 is applied to a solenoid valve.

FIG. 3 is a longitudinal cross-sectional view of essential parts showing a protrusion provided on a valve seat of a control valve according to another embodiment of the present invention.

FIG. 4 is an overall vertical sectional view in which a conventional control valve is applied to a solenoid valve.

5 (a) is a pressing force P of the valve body of FIG. 4 against the valve seat.
4B is a vertical cross-sectional view of an essential part showing a state in which the valve seat of FIG. 4 is made small in diameter.

[Explanation of symbols]

 1 Solenoid valve 2 Solenoid 3 Plunger (valve body) 31 Large diameter part 32 Small diameter part 4 Valve box 5 Coil 51 Hollow hole 6 Center post 7 Drain port 8 Valve seat 9 Flow path 10 Spring 11 Elastic member 12 Stepped part (projection) 13 protrusion 14 mating member

Claims (3)

[Scope of utility model registration request] 1. A control valve for opening and closing a flow path opening to a valve seat by bringing an elastic member such as rubber provided on an end surface of a valve body into and out of contact with the valve seat, wherein the valve seat and the elastic member are connected to each other. A control valve characterized in that a protrusion that partially enhances the surface pressure is provided in the contact surface so as to surround the flow path opening. 2. The control valve according to claim 1, wherein the protrusion is provided on the valve seat side of the contact surface between the valve seat and the elastic member. 3. The control valve according to claim 1, wherein the protrusion is provided on the elastic member side of the contact surface between the valve seat and the elastic member.