JPH08326938A - Umbrella valve - Google Patents

Abstract

PURPOSE: To give relief function to an umbrella valve so as to dispense with a relief valve in particular by forming a recessed part allowing movement of an umbrella shaped part and relief passages communicating across a partition wall at this time, when pressure over a fixed value acts in the direction of pressing the umbrella shaped part of an umbrella valve body on the partition wall side having communicating holes. CONSTITUTION: When back pressure P' lower than a fixed value is applied to an umbrella valve body 20, an umbrella shaped part 21 is pressed to the surface of a partition wall 12 so as to obstruct back flow. Meanwhile, when positive pressure P is applied to the back of the umbrella shaped part 21 through communicating holes 16 and relief grooves 15, the umbrella shaped part 21 is elastically deformed so as to open a flow passage. When back pressure over the fixed value is applied to the umbrella valve body 20, a thick wall part 22 on the center part of the valve body 20 is pressed to the position sinking in a tapered recessed part 13, the umbrella shaped part 21 is elastically deformed along a tapered inner wall 13a, and the end parts of the relief grooves 15 covered with the part 21 are opened. Consequently a relief passage by the relief grooves 15 and the communicating holes 16 is communicated, so as to allow fluid to pass through.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an umbrella valve having a function of a relief valve.

[0002]

2. Description of the Related Art Umbrella valves in which an umbrella-shaped portion and a shaft column at the center of the umbrella-shaped portion are integrally formed from an elastic material are widely used as a small, lightweight and inexpensive check valve (one-way valve). The partition wall of the flow path in which the umbrella valve body is mounted is provided with a shaft column support hole through which the shaft column is inserted and supported, and a circulation hole closed by the umbrella-shaped portion. In this umbrella valve, when a fluid pressure (positive pressure) acts on the umbrella-shaped portion through the circulation hole, the umbrella-shaped portion is deformed to separate from the partition wall and open the circulation hole to allow a fluid flow. Conversely, when a fluid pressure (reverse pressure) is applied to the umbrella-shaped portion in the direction of being pressed against the partition wall, the umbrella-shaped portion enhances the adhesion force with the partition wall and blocks the fluid flow.

The above-described backflow preventing function is maintained regardless of the magnitude of the fluid pressure acting on the umbrella-shaped portion in the direction of being pressed against the partition wall. This function is an essential function as an umbrella valve in one aspect, but even if the back pressure becomes extremely large, a backflow preventing function works unless the umbrella-shaped portion is broken. Therefore, when the back pressure may be significantly large, it is necessary to provide a relief valve in parallel with the umbrella valve that opens when the back pressure exceeds a certain value.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide the umbrella valve itself with a relief function so that it is not necessary to separately provide a relief valve for releasing the back pressure.

[0005]

SUMMARY OF THE INVENTION The present invention provides an umbrella valve body made of an elastic material, which has an umbrella-shaped portion and a shaft column integrally formed with a shaft portion of the umbrella-shaped portion; and a shaft column of the umbrella valve body. In a umbrella valve provided with a support hole for supporting a flow path and a partition hole for blocking a flow path, the flow path being closed by the umbrella-shaped portion; A recess that allows the central portion of the umbrella-shaped portion to move in the same direction when a certain pressure is applied; and a relief passage that communicates the front and rear of the partition wall when the umbrella-shaped portion moves into the recess. It is characterized by that. According to this umbrella valve, the action as a check valve is obtained in the normal state when the back pressure is less than a certain value, while when the back pressure exceeds the certain value,
Since the umbrella-shaped portion moves into the concave portion and opens the relief passage, a relief action is obtained.

The relief passage can be composed of, for example, a relief groove bored in the inner surface of the recess and a communication hole communicating with the relief groove. The movement of the umbrella-shaped portion into the concave portion is performed by at least causing the shaft column to slide with respect to the shaft column supporting hole of the partition wall by back pressure of a certain level or more, or causing the shaft column to buckle. Can be made.

According to another aspect of the present invention, the partition wall that closes the flow path, the shaft support hole, the recess having the shaft support hole as a center, and the relief groove formed on the inner surface of the recess. A communication hole communicating with the relief groove is formed, and the umbrella valve body is provided with a shaft column supported by the shaft column supporting hole of the partition wall and an umbrella-shaped portion having a diameter larger than the recess. The tip of the umbrella-shaped portion of the umbrella valve body is elastically contacted with the partition wall outside the recess to allow the fluid flow in the direction of deforming the umbrella-shaped portion through the communication hole and prevent the opposite fluid flow. When a certain amount of pressure is applied to the umbrella-shaped portion in the direction of pressing the umbrella-shaped portion toward the partition wall, the central portion of the umbrella-shaped portion is allowed to move into the recess, and the partition wall is provided through the relief groove and the communication hole. It is characterized by connecting the front and back of.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to illustrated embodiments. A partition 12 arranged in the flow path 11 so as to block the flow path is provided with a tapered recess 13, a shaft support hole 14, a relief groove 15, and a communication hole 16. The tapered recessed portion 13 has a tapered inner wall 13a whose diameter is gradually reduced from the front surface side (upper side in the drawing) of the partition wall 12 to the inner portion,
The partition wall 12 has a bottom wall 13b parallel to the surface of the partition wall 12, and a shaft support hole 14 is formed at the center thereof. The relief groove 15 is formed on the tapered inner wall 13 a along the inclination thereof, and the upper end portion thereof reaches the surface of the partition wall 12. In the illustrated example, four relief grooves 15 are formed at 90 ° intervals. One end of the communication hole 16 communicates with an intermediate portion of the relief groove 15, and the other end of the communication hole 16 has the partition wall 1.
There is an opening on the back side of 2. The relief groove 15 and the communication hole 16 are forward flow channels that flow from the back surface side to the front surface side of the partition wall 12 and, at the same time, when the back pressure exceeds a certain value, the fluid flows from the front surface side to the back surface side. It is also a relief passage.

The umbrella valve body 20 is made of an elastic material such as rubber, and has an umbrella-shaped portion 21 and a thick portion 22 at the center thereof.
The shaft pillar 23 extending from the center of the thick portion 22 and the retaining projection 24 formed on the shaft pillar 23 are integrally provided. The diameter of the umbrella-shaped portion 21 is sufficiently larger than the diameter of the tapered recessed portion 13 and the diameter of the circumscribed circle at the tip of the relief groove 15.

At the time of assembly, the shaft column 23 of the umbrella valve body 20 is inserted into the shaft column support hole 14 from the tapered recess 13 side and pulled from the back surface of the partition wall 12. Then, the retaining projections 24 are deformed and enter the shaft support holes 14, and eventually project to the back surface of the partition wall 12 to return to the original shape and are retained.
A tapered surface 14 a is formed at the entrance of the shaft support hole 14 to facilitate the deformation of the retaining projection 24. FIG. 1 shows this assembled state, and the tip end portion of the umbrella-shaped portion 21 covers the tapered concave portion 13 and the relief groove 15. At this time,
When the back pressure P ′ smaller than a certain value acts on the umbrella valve body 20, the umbrella-shaped portion 21 is simply pressed against the surface of the partition wall 12 to prevent the back flow. On the other hand, when the positive pressure P acts on the back surface of the umbrella-shaped portion 21 via the communication hole 16 and the relief groove 15, the umbrella-shaped portion 21 elastically deforms to open the flow path. That is,
Flow a normal flow. At this time, the retaining protrusion 2 of the shaft column 23
4 engages with the end of the shaft support hole 14 to prevent the thick portion 22 from moving. The above is the function of the normal check valve (one-way valve) of the umbrella valve. The back pressure P ′ is a fluid pressure acting on the umbrella valve body 20 from the front surface side of the partition wall 12, and the positive pressure P is the back pressure side of the partition wall 12 via the communication hole 16 and the relief groove 15 from the umbrella valve body. The fluid pressure acting on 20.

On the other hand, when the counter pressure PP exceeding a certain value acts on the umbrella valve body 20, the thick portion 22 at the center thereof falls into the tapered recess 13 as shown in FIG. In this embodiment, the movement of the thick portion 22 causes the shaft column 23 to move in the shaft column support hole 14 when the counter pressure becomes larger than the movement resistance force of the umbrella valve body 20 due to the elasticity of the umbrella-shaped portion 21. Caused by sliding. Then, the umbrella-shaped portion 21 has the tapered inner wall 1
3a elastically deforms, and the end of the relief groove 15 covered by the umbrella-shaped portion 21 opens. Then, the relief groove 15 and the relief passage formed by the communication hole 16 communicate with each other, and the partition wall 1
The fluid flows from the front surface side of 2 to the back surface side. Therefore, the partition wall 1
It is possible to eliminate the risk of the surface pressure of 2 exceeding a certain value. When the back pressure becomes equal to or less than a certain value, the state of FIG. 1 is restored.

In the above embodiment, the thick wall portion 22 is depressed (moved) into the tapered recess 13 due to the movement of the shaft column 23 in the shaft column support hole 14. However, the shaft column 23 should be thin. Accordingly, the same movement can be caused by the buckling of the shaft column 23.

Further, in the above embodiments, the relief groove 15 and the communication hole 16 are provided with a relief passage, but the relief passage may be provided independently of the communication hole 16. For example, even if the relief passage 17 is provided at the position shown by the chain line in FIG. 1 and the relief groove 15 is abolished, the same effect can be obtained.

[0014]

As described above, the umbrella valve of the present invention has the function of a check valve up to a certain back pressure and acts as a relief valve when the back pressure exceeds a certain value, so that it is a special relief valve. There is an advantage that a relief action can be obtained without providing the above. Further, the umbrella valve of the present invention is also simple in that it can be implemented by using the conventional valve body itself and changing only the partition shape.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an assembled state showing an embodiment of an umbrella valve according to the present invention.

FIG. 2 is a cross-sectional view of the umbrella valve of FIG. 1 in a state where a relief action is generated by back pressure.

FIG. 3 is a cross-sectional view showing a state before assembly of the umbrella valve of FIG.

[Explanation of symbols]

 11 Flow Path 12 Partition 13 Tapered Recess 14 Shaft Support Hole 15 Relief Groove 16 Communication Hole 20 Umbrella Valve Body 21 Umbrella Part 22 Thick Part 23 Shaft Column 24 Detent Protrusion

Claims (5)

[Claims] 1. An umbrella valve body made of an elastic material, comprising an umbrella-shaped portion and a shaft pillar integrally formed with a shaft portion of the umbrella-shaped portion; and a shaft for supporting the shaft pillar of the umbrella valve body. An umbrella valve provided with a partition wall that blocks a flow path and has a column support hole and a flow hole that is closed by the umbrella-shaped portion, wherein the partition wall further has a fixed direction in which the umbrella-shaped portion is pressed toward the partition wall. When the above pressure acts, a concave portion that allows the central portion of the umbrella-shaped portion to move in the same direction; and a relief passage that communicates the front and rear of the partition wall when the umbrella-shaped portion moves into the concave portion; Umbrella valve characterized by doing. 2. The umbrella valve according to claim 1, wherein the relief passage includes a relief groove formed in an inner surface of the recess and the communication hole communicating with the relief groove. 3. The umbrella valve according to claim 1, wherein the movement of the umbrella-shaped portion into the recess is caused by the shaft column sliding with respect to the shaft hole of the partition wall. 4. The umbrella valve according to claim 1 or 2, wherein the movement of the umbrella-shaped portion into the recess is caused by buckling of the shaft column. 5. A partition wall that closes the flow path, a shaft column support hole, and a recess having the shaft column support hole as a center.
A relief groove formed on the inner surface of the concave portion; a communication hole communicating with the relief groove; and a shaft column supported by the shaft column supporting hole of the partition wall in the umbrella valve body, and a larger diameter than the concave portion. An umbrella-shaped part is provided, and the tip of the umbrella-shaped part of the umbrella valve body is always elastically contacted with the partition wall outside the recess to allow the fluid flow in the direction of deforming the umbrella-shaped part through the communication hole. When the pressure above a certain level acts on the umbrella-shaped portion in the direction of pressing the umbrella-shaped portion toward the partition wall, the central portion of the umbrella-shaped portion is prevented from moving into the recess. An umbrella valve characterized by allowing the front and rear of a partition wall to communicate with each other through a relief groove and a communication hole.