JP2564386Y2 - Shut-off valve device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shut-off valve device incorporated in a gas meter, for example, to shut off gas flow in the event of an earthquake, gas leak, or other emergency.

[0002]

2. Description of the Related Art A seismic sensor for detecting an earthquake and a gas leak alarm for detecting a gas leak are known. In addition, a safety device that combines these seismic devices and gas leak alarms with a shut-off valve device and activates the shut-off valve device in the event of a shock or when a gas leak occurs to cut off the gas flow has also been put into practical use. Have been.

FIG. 10 shows a conventional shut-off valve device.
1 is a gas meter case, and 2 is a gas inlet. A casing 5 that partitions the primary side 3 and the secondary side 4 is provided inside the case 1, and a communication port 8 having a valve seat 7 is provided in a partition wall 6 at an upper portion of the casing 5. A self-holding solenoid 11 is provided on a lower partition wall 9 of the casing 5 via a mounting plate 10.

The self-holding solenoid 11 includes a coil 13 surrounding the plunger 12 via a pipe 13a, a magnet 15 having a yoke 14 provided on the outer periphery of the coil 13 and a core piece 15a provided on the bottom of the yoke 14. It is composed of

[0005] A valve body 16 facing the communication port 8 is attached to the tip of the plunger 12, and the valve body 16 is urged toward the valve seat 7 by a spring 17. When the coil 13 of the self-holding solenoid 11 is not energized, the plunger 12 overcomes the spring 17 and is attracted to the core piece 15a, and the valve body 16 is separated from the valve seat 7 and is in an open state. When a reverse magnetic field is applied by instantaneous energization, the valve body 16 is pressed against the valve seat 7 by the restoring force of the spring 17 to maintain the valve closed state.

The upper partition wall 6 of the casing 5
Are provided with bosses 18, 18 protruding toward the secondary side 4 side.
A support plate 19 is provided between the bosses 18. The support plate 19 is provided with a return shaft 20a urged upward by a spring 20 so as to be vertically movable. The lower end surface of the return shaft 20a is at the tip end surface of the plunger 12, and the upper end surface is the case 1 And the return operation button 20b provided on the front panel.

Therefore, an abnormality detector such as a seismic sensor or a gas leak alarm detects the abnormality and detects the abnormality.
By applying a reverse magnetic field to the communication port 8 of the gas meter.
Can be closed by the valve element 16 to shut off the gas flow.

In order to separate the valve element 16 from the valve seat 7 and return to the valve-open state, the return operation button 20b is pushed in, the return shaft 20a is pushed down against the restoring force of the spring 20, and the return shaft 20a is returned. The plunger 12 is pushed down against the restoring force of the spring 17 by the
By adsorbing the lower end surface of the core piece 15a to the core piece 15a,
The valve body 16 is kept in the open state.

[0009]

However, in the shut-off valve device configured as described above, when returning from the closed state to the open state, the return operation button 20b is pushed in, and the plunger 12 is directly moved by the return shaft 20a. Push down the valve body 16
Is separated from the valve seat 7, and the lower end surface of the plunger 12 is attracted to the core piece 15a.

Therefore, at the same time when the valve element 16 is separated from the valve seat 7, the gas on the primary side 3 is
Flows to In other words, since gas flows during the return operation of the valve element 16, there is a problem that self-damage cannot be prevented if it is assumed that the return is stopped by the return shaft 20a.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to allow a gas to flow from a primary side to a secondary side during a return operation of returning from a valve closing state to a valve opening state. It is another object of the present invention to provide a shut-off valve device that allows gas to flow after returning to a valve-open state.

[0012]

According to the present invention, in order to achieve the above-mentioned object, a first aspect of the present invention is a valve element which can be freely moved toward and away from a valve seat, and biases the valve element in a valve closing direction. The first spring includes a self-holding solenoid having a plunger connected to the valve body and holding the valve body in an open state against the restoring force of the first spring. A support portion that movably supports the plunger in the axial direction, a second spring that biases the entire self-holding solenoid in a direction in which a valve element is separated from a valve seat,
When the valve body in the closed state provided to face the self-holding solenoid is returned to the open state, the entire self-holding solenoid is advanced against the restoring force of the second spring, and the self-holding is performed. And a return operation part for separating the valve body from the valve seat against the first spring by adsorbing the plunger on the core piece of the solenoid.

[0013]

According to the first aspect, when the self-holding solenoid is advanced by the return operation portion against the restoring force of the second spring, the core piece of the self-holding solenoid is attracted to the plunger of the valve body in the closed state. When the return operation of the return operation portion is released, the self-holding solenoid retreats together with the plunger by the restoring force of the second spring, and separates the valve body from the valve seat to hold the valve open.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 5 show a first embodiment,
FIG. 5 shows the entire fluidic flow meter.
Is the case. The case 21 includes a case body 22 having a rectangular box shape, and a lid (not shown) for closing an opening of the case body 22.

A gas inlet 2 is provided at a lower portion of the case body 22.
4 and a gas outlet 25 are provided side by side, and a display window (not shown) is provided at the upper part. A fluidic element 27 and a shut-off valve 28 described below are provided at a lower portion inside the case 21.

The fluidic element 27 will be described. Reference numeral 33 denotes a flow path main body formed by die casting or the like, and a flow path 34 is formed. This flow path 34
Is partitioned by a partition wall 34 a, an upstream channel 35 communicates with the gas inlet 24, and a downstream channel 36 communicates with the gas outlet 25.

A valve body 37 having a communication port 34a is provided in the flow path body 33 located in the middle of the upstream side flow path 35, and the valve body 38 of the shut-off valve 28 faces the valve seat 37. . That is, when the pressure switch and the seismic sensor (not shown) detect abnormality,
4 can be cut off.

Referring to FIG. 1, the shut-off valve 28 will be described.
Is provided integrally with a cylindrical support portion 29. The flange 30 of the self-holding solenoid 11 is fitted into the support portion 29, and the self-holding solenoid 11 is movably supported along the axial direction of the plunger 12.

An annular groove 30a is formed on the outer peripheral surface of the flange 30, and a first O-ring 30b for sealing between the annular groove 30a and the inner peripheral surface of the support portion 29 is mounted. A through hole 31 into which the pipe 13a of the self-holding solenoid 11 is inserted is formed in the center of the flange 30, and an annular groove 31a is formed in the inner peripheral surface thereof.

A second O-ring 31b for sealing between the base 30 and the pipe 13a is mounted in the annular groove 31a. Further, the base 30 is provided with mounting bosses 31c, 31c.
1c and 31c include a yoke 1 of a self-holding solenoid 11
Attachment pieces 32, 32 formed by cutting and raising portions of 4, 14
Are fixed by bolts 32a, 32a. That is, the self-holding solenoid 11 is integrally fixed to the base 30 and is movable in the axial direction of the plunger 12 with respect to the support portion 29.

Plunger 1 of self-holding solenoid 11
A valve body 38 is attached to the distal end of the valve body 2, and a first spring 40 for urging the valve body 38 in the valve closing direction is interposed between the rear surface of the valve body 38 and the base 30.

Further, between the outer peripheral edge of the base 30 and the flow path main body 33, a second spring for urging the self-holding solenoid 11 in a retreating direction, that is, a direction in which the valve body 38 is separated from the valve seat 37. 41 are provided. And
The amount of movement of the self-holding solenoid 11 in the retreating direction is regulated by a ring-shaped stopper 42 provided on the inner peripheral surface of the support portion 39.

A mounting hole 45 is formed in the case 21 facing the end surface of the yoke 14 of the self-holding solenoid 11, and a return operation portion 46 is provided in the mounting hole 45. That is, reference numeral 47 denotes an operation case, which is screwed into the mounting hole 45 and fixed. Operation case 4
An operation button 48 is rotatably supported in the inside of the housing 7 and is urged in a backward direction by a return spring 49.

The self-holding solenoid 11 can be moved forward against the second spring 41 by pushing the operation button 48 with a finger or the like. Is covered with a cap 50 which is screwed and fixed.

The shut-off valve device configured as described above is shown in FIG.
As shown in the figure, the coil 13 of the self-holding solenoid 11
In a non-energized state, the plunger 12 is connected to the first spring 4.
It overcomes zero and is attracted by the attraction force of the magnet 15, the plunger 12 retreats, and the valve body 38 is separated from the valve seat 37 and held in the valve-open state.

However, when the coil 13 is momentarily energized to apply a reverse magnetic field, the plunger 12 moves forward due to the restoring force of the first spring 40, as shown in FIG.
The valve 8 comes into contact with the valve seat 37 to close the valve and maintain this state.

In order to return the valve body 38 to the valve open state, as shown in FIG.
When the yoke 14 of the self-holding solenoid 11 is pushed by 8, the whole self-holding solenoid 11 moves forward.

That is, when the entire self-holding solenoid 11 is advanced while compressing the second spring 41,
The core piece 15a contacts the end surface of the plunger 12.
Therefore, the plunger 12 is attracted to the core piece 15a by the attraction force of the magnet 15, and the entire self-holding solenoid 11 moves forward,
The valve body 38 is pressed against the valve seat 37. Therefore, no gas leaks from between the valve seat 37 and the valve body 38 during the return operation.

Next, when the finger is released from the operation button 48 of the return operation section 46, the operation button 48
And self-holding solenoid 11
The whole is retracted by the restoring force of the second spring 41.

At this time, the plunger 12 is attached to the core piece 1
Due to the magnetic attraction to the valve 5a, the valve body 38 is retracted together with the self-holding solenoid 11, is separated from the valve seat 37, and is held in an open state.

Further, as shown in FIG.
Is pressed by a finger and the self-initiating act of fixing the return button 48 during the return is assumed, the yoke 14 of the self-holding solenoid 11 → the core piece 15a → the plunger 1
2 and a magnetic circuit, when a reverse magnetic field similar to the cutoff signal is applied to the coil 14, the magnet 15 and the plunger 12 are separated, and the valve body 38 is pressed against the valve seat 37. Therefore, self-harm can be prevented.

FIGS. 6 to 9 show a second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. An opening 51 is provided in a part of the mounting plate 10 facing the valve seat 37. The opening 51 is closed by a base 52, and the base 52 and the mounting plate 10 are sealed by a first O-ring 53a.

At the base 52, mounting bosses 53, 53 serving as support portions are provided so as to protrude, and support columns 54, 54 are screwed to the mounting bosses 53, 53. Also, the base 52
The central part of the pipe 13a of the self-holding solenoid 11
Is formed, and an annular groove 55a is formed in the inner peripheral surface thereof. And this annular groove 55
A is provided with a second O-ring 56 for sealing between the base 52 and the pipe 13a.

Further, fitting holes 58, 58 of mounting pieces 57, 57 formed by cutting and raising a part of the yokes 14, 14 of the self-holding solenoid 11 are movable in the support columns 54, 54 in the axial direction. Is fitted. That is, the self-holding solenoid 11 is movable with respect to the base 52 in the axial direction of the plunger 12.

Plunger 1 of self-holding solenoid 11
A valve body 38 is attached to the distal end of the valve body 2, and a first spring 59 for urging the valve body 38 in the valve closing direction is interposed between the rear surface of the valve body 38 and the base 52.

Further, the base 52 and the mounting pieces 57,
The second springs 60, 60 are fitted to the mounting boss 53 and the support column 54 between the valve springs 57 and bias the self-holding solenoid 11 in the backward direction, that is, in the direction in which the valve body 38 is separated from the valve seat 37. Is provided.

The amount of movement of the self-holding solenoid 11 in the retreating direction is regulated by a stopper 61 formed of a washer fixed to the head of the support columns 54, 54, and the upper surface of the base 52 and the lower surface of the yoke 14 are fixed. An interval g slightly larger than the opening / closing stroke of the valve body 38 is formed therebetween.

The shut-off valve device configured as described above has a first
As shown in FIG. 6, when the coil 13 of the self-holding solenoid 11 is not energized,
2 overcomes the first spring 59 and the magnet 15
The plunger 12 retreats and the valve body 38 is separated from the valve seat 37 and is held in an open state by the suction force of the core piece 15a.

However, when the coil 13 is instantaneously energized to apply a reverse magnetic field, the plunger 12 moves forward by the restoring force of the first spring 59 and the valve body 3 as shown in FIG.
The valve 8 comes into contact with the valve seat 37 to close the valve and maintain this state.

In order to return the valve body 38 to the valve open state, as shown in FIG.
When the yoke 14 of the self-holding solenoid 11 is pushed by 8, the whole self-holding solenoid 11 moves forward.

That is, when the entire self-holding solenoid 11 is advanced while compressing the second springs 60, 60, the core piece 15 a comes into contact with the end face of the plunger 12.

Therefore, the plunger 12 is attracted to the core piece 15a by the attraction force of the magnet 15, and the whole body of the self-holding solenoid 11 is advanced to press the valve body 38 against the valve seat 37. Therefore, no gas leaks from between the valve seat 37 and the valve body 38 during the return operation.

Next, when the finger is released from the operation button 48 of the return operation section 46, the operation button 48
And self-holding solenoid 11
The whole is retracted by the restoring force of the second springs 60,60.

At this time, the plunger 12 is attached to the core piece 1
Due to the magnetic attraction to the valve 5a, the valve body 38 is retracted together with the self-holding solenoid 11, is separated from the valve seat 37, and is held in an open state.

Also, as shown in FIG.
Is pressed by a finger and the self-initiating act of fixing the return button 48 during the return is assumed, the yoke 14 of the self-holding solenoid 11 → the core piece 15a → the plunger 1
2 and a magnetic circuit, when a reverse magnetic field similar to the cutoff signal is applied to the coil 14, the magnet 15 and the plunger 12 are separated, and the valve body 38 is pressed against the valve seat 37. Therefore, self-harm can be prevented.

[0046]

As described above, according to the first aspect of the present invention, the self-holding solenoid is provided with a supporting portion for movably supporting the entire self-holding solenoid along the axial direction of the plunger. A second spring is provided for urging the entire valve body in a direction away from the valve seat, and the second spring is provided to return the valve body in a closed state provided to face a self-holding solenoid to a valve-open state. The self-holding solenoid is moved forward as a whole against the restoring force of the spring, and the plunger is attracted to the core piece of the self-holding solenoid to separate the valve body from the valve seat against the first spring. I did it.

Therefore, during the return operation of returning from the valve closing state to the valve opening state, the gas can be circulated after returning to the valve opening state without flowing gas from the primary side to the secondary side. is there.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view of a shut-off valve device in an open state according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the shut-off valve device of the embodiment in a closed state.

FIG. 3 is a vertical side view of the shut-off valve device during a return operation of the embodiment.

FIG. 4 is a vertical cross-sectional side view of the shut-off valve device of the embodiment when fixed during a return operation.

FIG. 5 is a partially cutaway front view of the gas meter incorporating the shut-off valve of the embodiment.

FIG. 6 is a longitudinal sectional side view of a shut-off valve device in a valve open state according to a second embodiment of the present invention.

FIG. 7 is a vertical sectional side view of the shut-off valve device of the embodiment in a closed state.

FIG. 8 is a vertical side view of the shut-off valve device at the time of a return operation of the embodiment.

FIG. 9 is a vertical cross-sectional side view of the shut-off valve device of the embodiment when fixed during the return operation.

FIG. 10 is a vertical side view of a conventional shut-off valve device.

[Explanation of symbols]

3 ... primary side, 4 ... secondary side, 11 ... self-holding solenoid, 12 ... plunger, 15 ... magnet, 15a ... core piece, 37 ... valve seat, 38 ... valve body, 40 ... first spring, 41 ... 2nd spring, 46 ... return operation part.

Continuation of the front page (72) Inventor Shigehiro Kobayashi 1-3-2 Shimura, Itabashi-ku, Tokyo Inside Kinmon Manufacturing Co., Ltd. (56) References (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A valve seat provided at a communication port that communicates between a primary side and a secondary side, a valve body that can be freely moved toward and away from the valve seat, and biases the valve body in a valve closing direction. A shut-off valve device comprising: a first spring; and a self-holding solenoid having a plunger connected to the valve body and holding the valve body in an open state against a restoring force of the first spring. A support for movably supporting the entire holding solenoid along the axial direction of the plunger, a second spring for urging the entire self-holding solenoid in a direction in which a valve element is separated from a valve seat; When returning the valve body in the closed state provided to the holding type solenoid to the open state, the entire self-holding solenoid is advanced against the restoring force of the second spring, and the self-holding solenoid is Plunger adsorbed on the core piece And a return operation section for separating the valve body from the valve seat against the first spring.