JPH10103542A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve capable of preventing any deformation and inclination of its valve element and leakage of fluid. SOLUTION: The check valve 1 is provided with, among a valve main body 2 having a valve storing chamber 9, the first route 11 opened to the valve storing chamber 9, the second route 14 opened to the valve storing chamber 9 and facing to the first route and the second route, the third route 17 opened to the valve storing chamber 9 along the direction which crosses the opening directions of those routes, and valve element 18 stored in the valve storing chamber 9 sand made of rubber-like elastic body. The valve element 18 is moved in the direction to either one of the first or the second route and the opening end of the first or second route can be so designed to be selectively closed. The valve element 18 is provided, in its inside, with a reinforcing member 21 having its rigidity higher than that of a rubber-like elastic body and by means of this reinforcing member, the rigidity of the valve element itself is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve applied to a fluid control device, and more particularly to a structure of a valve body for switching a flow path of a fluid.

[0002]

2. Description of the Related Art As a check valve used in a hydraulic or pneumatic type fluid control device, a check valve having the structure shown in FIG. 2 is conventionally known. The check valve 1 shown in FIG. 2 has a box-shaped valve body 2. A recess 3 is formed in the valve body 2, and a valve seat 4 and a valve guide 5 are housed in the recess 3.

The valve seat 4 is fitted to the end of the recess 3 via an O-ring 4b. The valve guide 5 includes a seal portion 6,
A hollow cylindrical guide 7 connected to the seal 6 is provided. The seal portion 6 is fitted to the open end of the concave portion 3 via an O-ring 6b. The seal portion 6 includes a support ring 8
And is held by the valve body 2 through the seal portion 6.
Faces the valve seat 4. The guide portion 7 is interposed between the seal portion 6 and the valve seat 4, and the tip of the guide portion 7 on the opposite side to the seal portion 6 is in contact with the valve seat 4.

[0004] Therefore, the valve seat 4, the seal portion 6 and the guide portion 7 of the valve guide 5 cooperate with each other to form a hollow valve accommodating chamber 9. Located inside.

[0005] The valve seat 4 has a communication hole 4 a opened to the valve accommodating chamber 9. The communication hole 4 a communicates with a communication port 10 opened in the peripheral wall of the valve body 2. These communication holes 4a
The communication port 10 cooperates with each other to form a first passage 11 connected to the valve chamber 9. A seat portion 12 is formed on a surface of the valve seat 4 facing the valve chamber 9. The seat 12 protrudes slightly from the surface of the valve seat 4 facing the valve chamber 9. The seat 12 has a ring shape coaxially surrounding the open end of the first communication passage 11. No.

[0006] The seal portion 6 of the valve guide 5 has a communication hole 6 a opened in the valve accommodating chamber 9. The communication hole 6a constitutes a second passage 14 that communicates with the valve housing 9. The open end of the second passage 14 to the valve storage chamber 9 faces the open end of the first passage 7 to the valve storage chamber 9. Then, a fluid such as oil or air flows through the first and second passages 11 and 14 at a predetermined pressure.
It is designed to flow into.

A seat 15 is formed on the surface of the seal 6 facing the valve chamber 9. The seat portion 15 is slightly protruded from a surface of the seal portion 6 facing the valve housing 9,
The seat portion 15 has a ring shape so as to coaxially surround the open end of the second passage 14.

The guide portion 7 of the valve guide 5 has a communication hole 7 a opened in the valve housing 9. The communication hole 7 a communicates with a communication port 16 opened in the peripheral wall of the valve body 2.
The communication hole 7 a and the communication port 16 cooperate with each other to form a third passage 17 connected to the valve housing 9. The open end of the third passage 17 to the valve housing 9 is located between the open ends of the first and second passages 11 and 14 to the valve housing 9. Is opened in a direction substantially orthogonal to the first and second passages 11 and 14.

A valve body 18 is housed in the valve housing chamber 9. The valve body 18 is made of a flexible rubber-like elastic body, and has a disk shape having a diameter larger than the outer diameter of the seat portions 12 and 15. The valve element 18 has a first seal surface 18a in contact with the seat portion 12, and a second seal surface 18b in contact with the seat portion 15.

When the pressure of the fluid flowing from the first and second passages 11 and 14 into the valve chamber 9 is received, the valve body 18 is guided by the inner surface of the guide portion 7 while the valve seat 4 is being guided. Alternatively, it can be moved in any direction of the seal portion 6. The moving direction of the valve element 18 is selectively determined by the magnitude of the pressure of the fluid flowing from the first passage 11 or the second passage 14 into the valve housing 9.

That is, when the pressure P1 of the fluid flowing through the first passage 11 is higher than the pressure P2 of the fluid flowing through the second passage 14, the pressure P1 applied to the valve 18 overcomes P2, and this valve 18 Are forcibly moved toward the seal portion 6 of the valve guide 5 as shown in FIG. By this movement, the second sealing surface 18b of the valve body 18
Is seated on the seat portion 15, and the second passage 14 and the valve accommodating chamber 9 are seated.
Communication with is interrupted. Therefore, the first passage 11 and the third passage 17 are communicated with each other via the valve housing 9, and the fluid in the first passage 11 is guided to the third passage 17.

On the other hand, the pressure P 2 of the fluid flowing through the second passage 14 is changed to the pressure P 1 of the fluid flowing through the first passage 11.
If the pressure becomes larger than P1, the pressure P2 applied to the valve element 18 becomes P1.
And the valve element 18 is forcibly moved toward the valve seat 4. This movement causes the second sealing surface 18 of the valve element 18 to move.
b is separated from the seat portion 15 and the valve body 18
The first sealing surface 18a of the
The communication between the passage 11 and the valve housing chamber 9 is cut off. Therefore, the second passage 14 and the third passage 17 are communicated with each other via the valve housing 9, and the fluid in the second passage 14 is supplied to the third passage 1.
It is led to 7.

Since the valve element 18 is made of a soft rubber-like elastic body, the valve element 18 is connected to the seat portion 12 of the valve seat 4 as shown in FIGS. Valve guide 5
When seated on the seat portion 15, the valve element 18 is curved in an arc shape by receiving the fluid pressure P1 or P2.

[0014]

However, as shown in FIGS. 2A to 2C, the first passage 11 and the third passage 11 are changed from the state of communication between the second passage 14 and the third passage 17. When switching to the communication state with the passage 17 of the
As shown by an arrow in FIG. 2B, it is moved from the valve seat 4 toward the seal portion 6 of the valve guide 5.

At this time, since the valve element 18 is surrounded by the guide portion 7 of the valve guide 5, the movement in the direction perpendicular to the moving direction is restricted by the guide portion 7. After detaching from the seat portion 12 of the valve seat 4, the valve element 18 once returns to its original shape with a decrease in the pressure P2, and also bends in the opposite direction with an increase in the pressure P1 while sealingly deforming. 6 is seated on the seat portion 15.

In the course of the series of movements of the valve element 18, when the valve element 18 is seated on the seat portion 15,
Is curved in an arc shape under the pressure P1 of the fluid,
As shown in FIG. 3, the valve element 18 is
2 can be inclined obliquely. As a result, a gap is formed between the second sealing surface 18b of the valve element 18 and the seat portion 15, and it becomes impossible to completely shut off the open end of the second passage 14.

Therefore, there is a problem that the fluid leaks to the second passage 14 and the flow path of the fluid cannot be completely switched. The present invention has been made in view of such circumstances, and provides a check valve capable of preventing deformation and inclination of the valve element when the valve element is seated and eliminating fluid leakage. Aim.

[0018]

In order to achieve the above object, the invention described in claim 1 provides a valve main body having a valve accommodating chamber; a first passage opened to the valve accommodating chamber; A second opening that opens into the valve chamber and faces the first passage;
A third passage opened in the valve accommodating chamber between the first passage and the second passage along a direction intersecting an opening direction of the passage; and the valve accommodating; A valve body housed in the chamber and formed of a rubber-like elastic body, and moved by receiving the pressure of the fluid flowing into the valve housing chamber from the first and second passages. Moving the valve body in one of the first and second passages according to the magnitude of the pressure of the fluid flowing into the storage chamber, and closing the open end of the first or second passage with the valve body; Accordingly, it is assumed that the check valve selectively switches communication between the first passage and the third passage or between the second passage and the third passage.

The valve element is characterized in that a reinforcing member having a higher rigidity than the rubber-like elastic element is provided inside the valve element. According to this configuration, since the rigidity of the valve body itself is increased by the presence of the reinforcing member, when the valve body is seated on the open end of the first or second passage, the valve body receives the pressure of the fluid and receives the pressure of the fluid. This also makes it difficult for the valve body to be deformed, and can prevent the valve body from tilting with respect to the open end of the first or second passage.
Therefore, the opening end of the first or second passage can be reliably blocked, and leakage of the fluid can be prevented.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIG. In this embodiment, since the basic configuration of the check valve is the same as the above-described conventional one,
Here, only the differences from the above-described conventional check valve 1 will be described, and the same components as those of the conventional check valve 1 will be denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1, inside the valve body 18,
The reinforcing member 21 is integrally embedded. Reinforcing member 2
1 is made of a material having much higher rigidity than a rubber-like elastic body such as a metal plate. The presence of the reinforcing member 21 increases the rigidity of the valve element 18 and makes it difficult for the valve element 18 itself to be deformed even when it receives the fluid pressure P1 or P2.

According to such a configuration, the rigidity of the valve element 18 is increased, so that even when the valve element 18 is pressed against the seat portion 15 or 12 by the fluid pressure P1 or P2, the valve element 18 is not , And it is difficult to deform into a bow shape as in the related art.

For this reason, the valve element 18 is provided with the seat portion 15 or 1
2 can be prevented from being inclined, and the first or second sealing surface 18a, 18b of the valve
Contact with no gap. Therefore, the open end of the first passage 11 or the second passage 14 can be completely blocked,
Fluid leakage to the first passage 11 or the second passage 14 can be reliably prevented. In the above embodiment, a metal plate is used as a reinforcing member. However, the present invention is not limited to this, and may be made of a synthetic resin according to the pressure of a fluid to be handled.

[0024]

According to the present invention described in detail above, since the rigidity of the valve body itself is increased, even when the valve body is seated at the open end of the first or second passage, the valve body is not , And it is difficult to deform into a bow shape as in the related art. Therefore, the inclination of the valve body can be prevented, the opening end of the first or second passage can be completely shut off, the leakage of the fluid can be eliminated, and the switching of the fluid flow path can be reliably performed. it can.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a check valve showing a state where a valve body closes an open end of a second passage in an embodiment of the present invention. (B) is a sectional view of the check valve, showing a state where the valve body closes the open end of the first passage.

FIG. 2A shows a conventional check valve in which a valve element is a first check valve;
Sectional drawing which shows the state which closed the opening end of the passage of FIG. (B)
FIG. 4 is a cross-sectional view of the check valve showing a state in which the valve body has returned to its original shape. (C) is sectional drawing of the check valve which shows the state which the valve body closed the opening end of the 2nd passage.

FIG. 3 is a cross-sectional view of the check valve showing a state where the valve body is tilted.

[Explanation of symbols]

 2 ... valve body 9 ... valve accommodating chamber 11 ... first passage 14 ... second passage 17 ... third passage 18 ... valve body 21 ... reinforcing member

Claims (1)

[Claims] A valve body having a valve storage chamber; a first passage opened in the valve storage chamber; a second passage opened in the valve storage chamber and facing the first passage; Between the first passage and the second passage, a third passage opened in the valve accommodating chamber along a direction intersecting the opening direction of these passages; and a third passage accommodated in the valve accommodating chamber; The first and second rubber members are made of a rubber-like elastic material.
A valve body that is moved by receiving the pressure of the fluid flowing into the valve storage chamber from the passage of the valve. And the valve body closes the open end of the first or second passage, whereby the first passage and the third passage or the second passage and the second passage are closed. 3. The check valve according to claim 3, wherein the valve body is provided with a reinforcing member having a higher rigidity than the rubber elastic body. valve.