JPH11182693A - Fluid shutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the effect of reducing back pressure during opening movement, by use of a simple structure with a small number of part items without providing an auxiliary valve mechanism. SOLUTION: A valve element 6 is constructed of elastic members. A plurality of joint legs 9 are integrally projected from the valve element 6 and are inserted into a joint hole 10 in a pressure holding plate 3 moved back and forth by an electric actuator, so that the joint legs 9 are deformably attached to the pressure holding plate 3. In a closed state, the valve element 6 is pressed against a valve seat 4 by the pressure holding plate 3; when the closed state is released with the pressure holding plate 3 moved backward, the valve element 6 leaves the valve seat 4 while being deformed to form a microclearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid shutoff valve used for gas equipment such as a gas meter, water supply piping equipment, air conditioning equipment and the like.

[0002]

2. Description of the Related Art A conventional fluid shut-off valve is, for example, disclosed in Japanese Patent Application Laid-Open No. 1-176876, in which the main flow is shut off at the center of a valve body in order to reduce the back pressure when the shut-off is opened. A sub-flow path smaller than the path is provided, and a sub-valve mechanism that opens the sub-flow path earlier than the main flow path during the opening operation is provided.

[0003]

However, such a sub-valve mechanism requires a double shut-off mechanism at the valve body, and the sub-valve has a smaller adhesion effect due to back pressure than the valve body. Since a unique biasing load was required, the number of parts was large and the structure was complicated. In addition, there is a problem that the blocking property of the main flow path is deteriorated by providing the sub-valve portion.

An object of the present invention is to provide a fluid shut-off valve which can obtain a back pressure reducing effect at the time of opening operation with a simple structure having a small number of parts without providing a sub-valve mechanism.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a fluid shut-off valve for moving a valve body 6 forward by a drive of an electric actuator such as a motor or a solenoid so as to press against a valve seat 4 to shut off a flow path 1. 6 being made of an elastic member;
The valve body 6 is deformably mounted on the pressing and holding plate 3 which is moved forward and backward by the electric actuator, and in the shut-off state, the valve body 6 is pressed by the pressing and holding plate 3 and pressed against the valve seat 4, and is pressed. 3 is characterized in that the valve element 6 is separated from the valve seat 4 while deforming when the valve 3 is retracted and opened.

When the valve element is structured as described above, the valve element 6 is deformed at the time of opening and closing, and a part thereof is separated from the valve seat 4 first, so that the back pressure is released from the minute gap.

To mount the valve element 6 on the pressing and holding plate 3 so that the valve element 6 can be deformed, various structures are conceivable. Then, it is structurally simple to insert the joint feet 9 into the joint holes 10 of the pressing and holding plate 3 and mount the valve element 6 to the pressing and holding plate 3.

In this case, it is preferable that each joint leg 9 is provided with a flange 9a for restricting removal from the joint hole 10. In addition, the length of some joint feet 9 is made different from the length of other joint feet 9, or the position of some joint feet 9 is line-symmetric and rotationally symmetric with respect to the position of other joint feet 9. If the position is not asymmetric, the valve body 6 can be easily deformed.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, the fluid shut-off valve is provided at a position where an inflow side 1a and an outflow side 1b intersect at right angles in the middle of a gas flow path 1, and a circular pressure holding plate 3 in a valve chamber 2 is provided.
An electric actuator (not shown) such as a motor or a solenoid moves forward and backward from the outside of the valve chamber 2 so that the outflow side 1b
The valve port 5 of the valve seat 4 provided in the opening is opened and closed by a circular plate-shaped valve element 6 attached to the front surface of the pressing and holding plate 3.

In order to convert the forward / reverse rotation of the electric actuator into forward / backward movement of the pressing / holding plate 3, a lead shaft 7 rotated by the electric actuator is connected to a cylindrical body projecting from the center of the pressing / holding plate 3. 8 and lead shaft 7
And the female thread of the tubular body 8 are screwed together.

FIGS. 2 and 3 show a mounting structure of the valve body 6 to the pressing and holding plate 3. FIG. The valve body 6 is made of an elastic member such as rubber, and has a plurality of joint legs 9 integrally projecting from the back surface thereof. Each joining leg 9 is integrally provided with a flange 9a. The valve body 6 is mounted on the pressing and holding plate 3 by inserting the connecting feet 9 into the same number of connecting holes 10 provided in the pressing and holding plate 3.

For the insertion, a flange 9a of each joint foot 9
Is forcibly penetrated through the joint hole 10 and is positioned on the back side of the pressing and holding plate 3, so that the joint foot 9 is prevented from being pulled out of the joining hole 10. 3
, And can be deformed while forming a gap with the front surface.

In the example shown in the figure, there are four connecting feet 9, which are arranged at 90-degree intervals in line symmetry and rotational symmetry, and the length L of some of the connecting feet 9 is determined by the deformation of the valve body 6 itself. Is longer than the lengths of the other connecting feet 9 to facilitate the operation.

In the above structure, the pressing and holding plate 3
Is advanced toward the valve seat 4 and the valve body 6 is pressed against the valve seat 4, the valve port 5 is closed, and the gas flow path 1 is cut off between the inflow side 1 a and the outflow side 1 b. . At this time,
The entire back surface of the valve body 6 and the front surface of the pressing and holding plate 3 are in close contact with each other, and a back pressure of fluid acts on the pressing and holding plate 3.

In order to perform the opening operation by retracting the pressing and holding plate 3 from such an interrupted state, usually a thrust several times as large as the interrupting operation is required. Simultaneously with the retreat of the plate 3, the valve body 6 is released from the pressing by the pressing and holding plate 3, and the length L
Is longer than the lengths of the other connecting feet 9, the valve body 6 is deformed while forming a gap between the valve body 6 and the front surface of the pressing and holding plate 3.

Due to this deformation, a minute gap is formed between the front surface of the valve element 6 and the valve seat 4, and the back pressure acting on the pressing and holding plate 3 is reduced by the minute gap. For this reason, the pressure holding plate 3
The opening operation of the valve port 5 can be performed with a small propulsive force (retreat force).

In the above example, the four connecting feet 9 are arranged in line symmetry and rotational symmetry, and the length L of some of the connecting feet 9 is made longer than the length of the other connecting feet 9. Thereby, the deformation of the valve body 6 is easily performed.
Deformation of the valve element 6 can be easily performed even when the positions of some of the connecting feet 9 are asymmetrical positions that are not line-symmetric and rotationally symmetric with respect to the positions of the other connecting feet 9. Also, the number of the joint feet 9
Naturally, the number is not limited to four.

[0019]

As described above, according to the present invention, the valve body is deformed while forming a gap between the valve body and the front surface of the pressure holding plate when the valve is shut off and opened. And the back pressure acting on the valve element and the pressure holding plate is reduced by this minute gap. It can be carried out.

According to the second aspect of the present invention, the mounting of the valve element to the pressing and holding plate can be easily performed by the joint feet integrally projecting from the valve element.

According to the third aspect of the present invention, the flange of the joint foot of the valve body is forcibly penetrated into the joint hole of the press holding plate and is positioned on the back side of the press holding plate, thereby holding the press. The valve element can be easily held on the plate.

According to the fourth aspect of the present invention, the length of a part of the joint foot is made different from the length of the other joint foot,
The valve body can be easily deformed.

According to the fifth aspect of the present invention, the position of some of the joint feet is asymmetrical with respect to the position of the other joint feet so as not to be line-symmetric and rotationally symmetric, thereby facilitating the valve body. Can be deformed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a relationship between a valve body and a pressure holding plate.

FIG. 3 is a rear view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas flow path 1a Inflow side of gas flow path 1b Outflow side of gas flow path 2 Valve chamber 3 Press holding plate 4 Valve seat 5 Valve port 6 Valve body 7 Lead shaft 8 Cylindrical body 9 Joint foot 9a Flange 10 Joint hole

Claims (5)

[Claims] 1. A fluid shut-off valve for moving a valve body forward by a drive of an electric actuator such as a motor or a solenoid to press against a valve seat to shut off a flow path, wherein the valve body is constituted by an elastic member. The body is deformably mounted on a pressing and holding plate that is moved forward and backward by the electric actuator, and in a shut-off state, the valve body is pressed by the pressing and holding plate and pressed against the valve seat, thereby retreating the pressing and holding plate. The fluid shut-off valve is characterized in that the valve body is deformed and separates from the valve seat at the time of shut-off and opening. 2. A method according to claim 1, wherein a plurality of joint feet are integrally formed on said valve body, and said joint feet are inserted into joint holes of said pressing and holding plate to mount said valve body on said pressing and holding plate. The fluid shut-off valve according to claim 1, characterized in that: 3. The fluid shut-off valve according to claim 2, wherein each of the connecting feet is provided with a flange for restricting withdrawal from the connecting hole. 4. The fluid shut-off valve according to claim 3, wherein the length of some of the connecting feet is different from the length of the other connecting feet. 5. The method according to claim 2, wherein the positions of some of the joint feet are asymmetrical positions that do not become line-symmetric and rotationally symmetric with respect to the positions of the other joint feet. The fluid shut-off valve according to any of the preceding claims.