JP2003278929A - Directional selector valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a directional selector valve capable of adjusting each valve opening degree of a valve element as a valve component by a simple means. <P>SOLUTION: Valve chests 2 provided in a valve body 1 are provided facing each other in the driving direction of the valve component, and have a pair of valve seats 5 and 7 to close a flow passage when abutted on the valve component 3. The valve component 3 in the valve chest 2 comprises a first valve element 10 in contact with one valve seat 5 and a second valve element 11 in contact with the other valve seat 7, and the first and second valve elements 10 and 11 are formed of elastic materials having moduli of elasticity different from each other. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional control valve for switching a fluid passage, and more particularly to a directional control valve characterized by the structure of a valve member in a valve chamber.

[0002]

2. Description of the Related Art A directional control valve having a valve member for switching a flow path between a plurality of ports in a valve chamber of a valve body has been generally known. In this type of switching valve, a pair of valve seats facing each other are provided in the valve chamber, and a pair of valve bodies provided on both sides of the valve member facing each other are corresponding valve seats by driving the valve members. The one in which the flow path is switched by contacting with or separating from is advantageous in that the structure is simple and the size can be reduced. However, for example, in order to make the amount of fluid flowing between the ports the same regardless of the difference in the pressure contact force of the valve body with respect to the valve seat, it is necessary to make the valve opening degrees of the valve bodies almost equal. , Opening of each valve body, such as when it is necessary to make the degree of opening of each valve body different in order to make the amount of fluid flowing through a certain port larger than that of other ports to make the fluid flow faster When it is necessary to adjust the degree (stroke), it is not possible to adjust the opening degree of each valve body conveniently by changing the design of only the valve member. Therefore, adjustment of the opening degree of each valve body
It is conceivable that the adjustment is performed by a completely different mechanical element, but the configuration of the entire switching valve may be very complicated.

[0003]

SUMMARY OF THE INVENTION A technical object of the present invention is to provide a directional control valve capable of adjusting the degree of opening of each valve element of a valve member by a simple means.

[0004]

In order to solve the above problems, a directional control valve according to the present invention comprises a valve body, a plurality of ports provided in the valve body, and a valve chamber provided in the valve body. And a valve member disposed in the valve chamber and switching the flow path between the plurality of ports by driving, the valve chambers facing each other in the driving direction of the valve member. A first valve body that is provided and that closes the flow path by abutting the valve member, the valve member contacting one valve seat, and a second valve member contacting the other valve seat.
A valve body, and the first and second valve bodies are formed of elastic bodies having elastic coefficients different from each other.

In the directional control valve having the above structure, the first and second valve bodies of the valve member have different elastic coefficients, so that the mutual deformation amounts when the valve bodies are pressed against the valve seat are changed. The distance between each valve body and the corresponding valve seat can be adjusted when the first and second valve bodies are opened. Therefore, the degree of opening of each valve element can be reliably adjusted by a very simple means of forming the first and second valve elements with elastic bodies having different elastic coefficients.

In the present invention, the valve member may be formed by integrally forming the first and second valve bodies. In this case, the valve member may be the first valve member.
Alternatively, it is preferable that either one of the second valve bodies is embedded in the other valve body.

Further, in the present invention, the valve member has a valve opening force that causes the distance between the valve member and the corresponding valve seat at the time of opening the first and second valve bodies to act on both valve bodies. The opening degree can be adjusted so that they are substantially the same as each other regardless of the difference of
Due to the difference in elasticity between the first valve body and the second valve body, the distance between the corresponding valve seats at the time of opening each valve is made different, and the opening degrees are adjusted to be different from each other. Can also be

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the directional control valve of the present invention.
A valve body 1, an input port P provided on the valve body 1 and connected to a supply source of compressed fluid, an output port A connected to an actuator such as an air cylinder, and an exhaust port R exhausted to the outside. And three ports, a valve chamber 2 provided in the valve body 1, and a valve chamber 2 disposed in the valve body 2.
The valve member 3 that switches the flow paths between these ports by driving is provided.

A solenoid 20 for driving the valve member 3 by a movable iron core 22 driven by energizing a coil 21 is attached to the valve body 1.
In FIG. 1, the solenoid 20 includes a movable iron core 22 that can be driven in the vertical direction, a bobbin 23 that is arranged on the outer peripheral side of the movable iron core 22, and around which the coil 21 is wound.
A magnetic case 24 provided around the coil 21, a magnetic plate 25 arranged on the opening side of the magnetic case 22 of the coil 21, and a spring seat 22a attached to the tip side of the movable iron core 22. When the coil 21 is energized, the movable iron core is attracted to the upper end as shown in the right half of FIG. 1 when it has a return spring 26 provided between it and the magnetic plate 25. When it is driven and is in a non-energized state, the drive is released and the elastic force of the return spring 26 pushes it downward to return it to its original position.

The valve chamber 2 is provided with a pair of valve seats which face each other in the driving direction of the valve member 3 and close the flow passage by the contact of the valve member 3. That is, the first valve seat 5 on the valve chamber 2 side of the flow passage 4 that connects the input port P and the output port A, and the valve chamber 2 of the flow passage 6 that connects the discharge port A and the output port R. The second valve seat 7 of the side portion is provided, respectively. The first valve seat 5 is provided at the tip portion of the protrusion 8a of the valve seat member 8 having the protrusion 8a in which the flow passage 4 is provided at the center, and the passage 4 of the tip portion is provided. The peripheral edge of the opening functions as a valve seat. The tip portion of the protruding portion 8a is formed in a gentle curved surface shape, and when it contacts the valve member 2, the valve member 2
The channel 4 can be surely closed. The valve seat member 8 is supported in the valve body 1 by a bush 9. On the other hand, the second valve seat 7 is provided integrally with the valve body 1 and is provided so as to project at the peripheral portion of the opening of the flow passage 6 on the valve chamber 2 side.

As shown in FIGS. 2 and 3, the valve member 3 is integrally formed of a first valve body 10 that contacts the first valve seat 5 and a second valve seat 11 that contacts the second valve seat. Has been done. These first and second valve bodies 10 and 11 are held in the valve chamber 2 by a holding member 13, as shown in FIG.
This holding member 13 is used for the movable iron core 2 of the solenoid 20.
2 and a cylindrical container for accommodating the first and second valve bodies 10 and 11 which is disposed on the proximal end side of the rod 14 and which penetrates and opens in the driving direction of the valve member 3. Part 1
5 and 5 are integrally provided. In addition, this body portion 15
In the peripheral edge of the side where the second valve body 11 is accommodated in, the stopper portion 17 is provided so as not to interfere with the second valve body 11 and serves to prevent the valve member 3 from slipping out of the container portion 15. Is projected.

The first valve body 10 has a cylindrical base portion 10a which is in contact with the support plate 12 side, a truncated cone-shaped valve portion 10b whose tip is in contact with the first valve seat 5, and the valve of the base portion 10a. The portion 10b and the recessed portion 10c provided on the opposite end surface are integrally provided. On the other hand, the second valve body 11 has the recess 10
c has a shape conforming to c, is embedded in the recess 10c, and the end surface exposed to the outside is flush with the end surface of the first valve body 10 (the upper end side of the valve member in FIG. 1). ) Is formed.

Between the base portion 10a of the first valve body 10 and the valve seat member 8, it also serves to hold the holding members 13 of the first and second valve bodies 10 and 11 in the body portion 15. A return spring 18 for returning the valve member 3 is provided. Therefore, the valve member 3 corresponds to the holding member 1
The rods 14, 14 of No. 3 are pushed downward by the pressing force of the return spring 26 acting on the movable iron core 22 to press the first valve seat by the first valve body 10, and the movable iron core 22 is moved upward by energization. When driven, the second valve body 11 presses the second valve seat 7 by the urging force of the return spring 18 and the fluid pressure.

The first valve body 10 and the second valve body 11 are also provided.
Are formed of elastic bodies having elastic coefficients different from each other, and the distance a between each corresponding valve seat and each valve opening is a.
And b so that they are substantially equal to each other irrespective of the difference in valve opening force acting on both valve bodies.
Each opening degree of the valve bodies 10 and 11 is adjusted. That is,
In addition to the pressing force by the movable iron core 22, the valve member 3 is
Fluid pressure due to the fluid flowing through the flow paths 4 and 6 and external force due to the biasing force of the return spring 26 of the solenoid 20 and the return spring 18 of the valve member 3 act, but in consideration of the action relationship of these forces, The valve members 3 as a whole are adjusted so that the distances a and b are substantially equal by the balance of the elastic deformation amounts of the valve bodies 10 and 11, respectively.
The aperture ratios of 0 and 11 are made substantially equal.
For example, in the case where the upward external force acts on the valve member 3 more than the downward direction and the opening degree of the first valve body 10 tends to be larger than that of the second valve body 11, the first valve body 10 By using the second valve body 11 having a smaller elastic coefficient than the second valve body 11 to reduce the deformation amount of the second valve body 11,
By adjusting the stroke of 11, it is possible to make each opening degree to the same degree.

The directional control valve having the above-mentioned structure is the valve member 3
By adjusting the first and second valve bodies 10 and 11 having different elastic coefficients from each other, the mutual deformation amount when each valve body 10 and 11 is pressed by the corresponding valve seat 5 and 7 is adjusted. Therefore, the first and second valve bodies 1 are
The respective distances a and b between the valve seats 0 and 11 and the valve seats 5 and 7 at the time of valve opening can be adjusted, and thus the opening degrees of the valve bodies 10 and 11 can be adjusted. Therefore, the opening degree of each valve element can be reliably adjusted by an extremely simple means of forming the first and second valve elements 10 and 11 with elastic bodies having different elastic coefficients.

In the above embodiment, the first valve body 10 is used.
Due to the difference in elasticity between the second valve body 11 and the second valve body 11, the distances between the corresponding valve seats at the time of opening each valve are substantially the same regardless of the difference in the valve opening force acting on both valve bodies. The degree of opening of each of the first and second valve bodies is adjusted so as to be approximately the same. However, the present invention is not limited to this, and the difference in elasticity causes the distance between each valve opening and the corresponding valve seat to change. A difference may be generated and each opening degree of the first and second valve bodies may be adjusted. For example, when it is desired to exhaust the gas quickly, the fluid pressure acting on the entire valve member 3 and the urging force of the return springs 18 and 26 are taken into consideration, and the second valve body is more elastic than the elastic coefficient of the first valve body 10. When the elastic coefficient of 11 is reduced, the soft first valve body 10 is elastically pressed against the first valve seat 5 at a deeper position, so that the opening degree on the second valve body side can be made larger than that on the first valve body side. It is possible to adjust the aperture according to the application.

Further, in the above-mentioned embodiment, the valve member 3 is formed by embedding the second valve body 11 in the recess 10C of the first valve body 10 and integrally forming it as a whole.
The first valve body may be embedded in the valve body 11. Further, the valve member 3 includes a first valve body 10 and a second valve body 11
Does not have to be a structure in which one is buried in a recess formed in the other, and the first and second valve bodies have different elastic coefficients, such as those in which members having appropriate shapes as valve bodies are simply joined together. As long as it is formed of an elastic body, it can be formed by any means.

Further, in the above embodiment, the valve member 3
Although the driving is performed by the movable iron core 22 of the solenoid 20, any driving means using various fluid pressure devices or a manual handle can be used.

[0019]

As described in detail above, according to the directional control valve of the present invention, each valve element has a valve seat by making the first and second valve elements of the valve member have different elastic coefficients. It is possible to adjust the mutual deformation amount when they are pressed against each other, whereby the distance between each valve body and the corresponding valve seat can be adjusted when the first and second valve bodies are opened. Therefore, the first
Also, the degree of opening of each valve element can be reliably adjusted by a very simple means of forming the second valve element with an elastic body having a different elastic coefficient.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a directional control valve of the present invention. However, the left half shows the time when the coil is not energized, and the right half shows the time when the coil is energized.

FIG. 2 is a perspective view of a valve member.

FIG. 3 is a sectional view of the same.

FIG. 4 is a perspective view showing a state where the valve body is held by a holding member.

[Explanation of symbols]

1 valve body 2 valve chambers 3 valve members 5 First valve seat 7 Second valve seat 10 First valve body 11 Second valve body 13 Holding member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takumi Matsumoto             4-2-2 Kinnodai, Taniwahara Village, Tsukuba-gun, Ibaraki Prefecture             SMC Corporation Tsukuba Technology Center F term (reference) 3H067 AA02 CC04 CC10 DD05 DD12                       DD32 EA32 EA39 FF17                 3H106 DA08 DA23 DB02 DB12 DB23                       DB32 DC02 DC18 DD03 EE48                       GB10 GB11 HH05

Claims (5)

[Claims] 1. A valve body, a plurality of ports provided in the valve body, a valve chamber provided in the valve body, a valve chamber provided in the valve chamber, and a flow between the plurality of ports when driven. In a directional control valve having a valve member for switching a passage, the valve chambers are provided so as to face each other in a driving direction of the valve member, and a pair of valve seats that close the flow passage by abutting the valve member. And the valve member has a first valve body that is in contact with one valve seat and a second valve body that is in contact with the other valve seat, and these first and second valve bodies are A directional control valve, which is formed of elastic bodies having mutually different elastic coefficients. 2. The directional control valve according to claim 1, wherein the valve member is formed by integrally forming a first valve element and a second valve element. 3. The directional control valve according to claim 2, wherein the valve member is constructed by embedding one of the first and second valve bodies in the other valve body. What has been done. 4. The directional control valve according to any one of claims 1 to 3, wherein the valve member has a distance between a corresponding valve seat of each of the first and second valve bodies when opening the valve, The degree of opening is adjusted so that they are almost the same regardless of the difference in the valve opening force acting on both valve bodies. 5. The directional control valve according to claim 1, wherein the valve member has a corresponding valve seat when each valve is opened due to a difference in elasticity between the first valve body and the second valve body. It is adjusted so that the distance between the and is different, and the apertures are different from each other.