JPH0227742Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) This invention relates to a shutoff valve device that is combined with a gas meter and shuts off gas flow in the event of an earthquake, gas leak, or other emergency.

[Technical background of the invention and its problems]

Earthquake sensors that detect earthquakes and gas leak alarms that detect gas leaks are known. In addition, a safety device has been put into practical use that combines the above-mentioned earthquake sensor or gas leak alarm with a shutoff valve device and operates the shutoff valve device to shut off the gas flow when an earthquake is felt or a gas leak occurs. There is.

However, a shutoff valve device incorporated in a conventional gas meter or the like is constructed as shown in FIG. 4. That is, 101 is a case body of the gas meter, 102 is a gas inlet, and 103 is a communication port communicating with the valve chamber. And inlet 1
Partition wall 104 that partitions 02 and the flow port 103
A flow port 106 having a valve seat 105 is provided. Furthermore, a self-holding solenoid 107 is provided in the case body 101 facing the flow port 106.
is provided. This self-holding solenoid 1
07 is a coil 10 surrounding the plunger 108
9. Yoke 11 provided on the outer periphery of this coil 109
0 and a magnet 111 provided at the bottom of this yoke 110. A valve body 112 facing the flow port 106 is attached to the tip of the plunger 108.
2 is urged toward the valve seat 105 by a spring 113. When the coil 109 of the self-holding solenoid 107 is not energized, the plunger 108 overcomes the spring 113 and is attracted to the magnet 111, and the valve body 112 is separated from the valve seat 105 and is in the open state, but the coil 109 When a reverse magnetic field is applied by momentarily energizing, spring 1
The restoring force of 13 presses the valve body 112 against the valve seat 105 to maintain the valve closed state.

On the other hand, a return operation mechanism 114 for manually returning the valve body 112 to the open state is provided at the front part of the case body 101 facing the communication port 106.
is provided. This return operation mechanism 114 has a cylindrical body 116 attached to a mounting hole 115 drilled in the case body 101, and is inserted into this cylindrical body 116 so that its tip protrudes to the communication port 106 and has an end extending outward from the case body 101. A push rod 118 is provided which has a return button 117 projecting into it. And this push rod 118
is urged in the backward direction by a return spring 119 inserted into the cylindrical body 116. Further, the return button 117 is covered by a cap 120 that is removably screwed onto the cylindrical body 116.

Therefore, when the abnormal condition is resolved and you want to use the gas appliance again, loosen and remove the cap 120, press the return button 117 with your finger, and push the push rod 118 against the restoring force of the return spring 119. When advanced, the valve body 112 retreats against the restoring force of the spring 109, and when the plunger 108 comes into contact with the magnet 111, it is held by the attraction force of the magnet 111. In other words, the valve body 112 is held apart from the valve seat 105, and when the return button 117 is released, the restoring force of the return spring 119 causes the push rod 1 to be released.
Even if the valve 18 returns to its original state, the valve remains open.

In this manner, in the conventional shutoff valve device, by pressing the return button 117, the valve body 112 is directly pressed and held in the open state, and the self-holding solenoid 107 is automatically activated again in the event of an abnormality. However, if the return button 117 is kept depressed, the push rod 118 restricts the movement of the valve body 112. Therefore, a foreign object was put inside the cap 120 as a prank, and the cap 120 was inserted into the cylindrical body 11.
6, the return button 117 remains depressed, and the valve body 112 can be held in a restrained state by the push rod 118. Therefore, even if an abnormality detector such as a flow rate sensor or a seismic sensor detects an abnormality and a reverse magnetic field is applied to the self-holding solenoid 107, the plunger 108 does not move and remains locked in the open state. and is extremely dangerous.

[Purpose of invention]

This idea was created with the above-mentioned circumstances in mind, and its purpose is to automatically shut off the flow path when the return button is pressed repeatedly, improving safety. The purpose of the present invention is to provide a shutoff valve device that can be used.

[Summary of the idea]

In order to achieve the above object, this invention provides a movable valve seat on the push rod that moves forward when the return button is pressed, and during the return operation, the movable valve seat is pressed against the valve body to close the flow path. The structure is such that the flow passage does not open unless the push rod is held in place and the push rod is retracted.

[Example of idea]

An embodiment of this invention will be described below based on the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a case body of a gas meter, which is composed of a lower case 2 and an upper case 3. A metering chamber 4 is provided inside the lower case 2, and a valve chamber 5 is provided inside the upper case 3. Further, an inlet 6 is provided on one side of the upper part of the upper case 3, and an outlet 7 is provided on the other side. Further, a partition wall 8 is provided at the upper part of the valve chamber 5, and an electronic component chamber 9 is provided which is isolated from the valve chamber 5 by the partition wall 8. Therefore, this electronic component chamber 9 is closed at the front, upper and lower surfaces, and both side surfaces except for the back surface, and an opening 10 is provided at the back surface. A lid plate 1 is inserted into this opening 10 through a packing 11.
2 is removably attached by mounting screws 13. Further, on the inlet 6 side of the electronic component chamber 9, a support wall 14 protruding from the front wall and a cylindrical body 15 are provided integrally with the support wall 14. Then, the through hole 1 is left at the bottom of the cylinder 15, leaving the flange 15a.
5b is drilled. Furthermore, a movable valve seat 16 is inserted into the cylindrical body 15 so as to be movable in the axial direction. This movable valve seat 16 has a cylindrical shape, and an annular groove 16a is provided on its outer peripheral surface.
A sealing material 17a made of an O-ring is inserted into this annular groove 16a. In addition, this movable valve seat 1
A flat packing 17b is interposed between the end face of 6 and the flange 15a. A fluid flow path 18 is provided inside the movable valve seat 16. Further, a mounting seat 20 is provided on the support wall 14 and the inner wall of the upper case 3, and a blocking device 21 for blocking the flow path 18 is provided on the mounting seat 20. This shutoff device 21 consists of a self-holding solenoid 22 as a holding mechanism fixed to a mounting seat 20, a valve body 24 fixed to a plunger 23 of this solenoid 22 and facing the flow passage 18, and a movable valve seat for this valve body 24. It is composed of a spring 25 that biases in 16 directions. This self-holding solenoid 22 is
Coil 26, yoke 2 surrounding this coil 26
7 and the magnet 2 provided at the bottom of the yoke 27
It consists of 8. When the coil 26 of the self-holding solenoid 22 is not energized, the plunger 23 overcomes the spring 25 and is attracted to the magnet 28, and the valve body 24 is separated from the movable valve seat 16 and is in the open state. When the valve is momentarily energized to apply a reverse magnetic field, the restoring force of the spring 25 presses the valve body 24 against the movable valve seat 16 to maintain the valve closed state.

On the other hand, a return operation mechanism 29 for manually returning the valve body 24 to the open state is provided at the front portion of the upper case 3 facing the flow path 18. This return operation mechanism 29 has a cylindrical body 31 attached to a mounting opening 30 protruding from the upper case 3.
It is inserted into this cylindrical body 31 and its tip is connected to the movable valve seat 16, and the upper case 3 is inserted at the end.
A push rod 33 is provided having a return button 32 projecting outwardly therefrom. This push rod 33 is urged in the backward direction by a return spring 34 inserted into the cylinder 31. Further, the return button 32 is covered by a cap 35 that is removably screwed onto the cylindrical body 31. and the length of the push rod 33;
That is, the stroke pushes the valve body 24 in the closed state through the movable valve seat 16 against the restoring force of the spring 25, and the plunger 23 pushes the magnet 28.
The length is set so that the valve is attracted to the valve and held in the open state. Moreover, the outer circumferential surface of the movable valve seat 16 is sealed to the inner circumferential surface of the cylindrical body 15 by a sealing material 17, and during the return operation, the push rod 33 is advanced to push the valve body 24 in the valve opening direction. During the pushing process and in the pushed-in and held state, the tip of the movable valve seat 16 is in pressure contact with the valve body 24, so the flow passage 18 is closed.
That is, after the valve body 24 is returned to its original position by the movable valve seat 16, the return button 32 is released and the push rod 33 is released by the restoring force of the return spring 34.
and the flow path 1 unless the movable valve seat 16 is returned.
8 is designed to prevent it from opening, and a foreign object such as a stone was put inside the cap 35 as a prank, and the return button 32 was pressed.
Even if the operator continues to press , the flow path 18 is blocked by the movable valve seat 16.
Further, a partition wall 8 is provided approximately in the center of the electronic component chamber 9.
A printed circuit board storage section 36 is provided integrally with this. This printed circuit board storage section 36 is located in the upper case 3.
Guide members 37, 37 provided along the front and back direction of
A printed circuit board 38 is supported between the guide members 37 and 37 so as to be insertable and removable from the opening 10 side. Various electronic components (not shown) are mounted on this printed circuit board 38 to constitute a control circuit 39. Further, the printed circuit board 38 is fixedly held by a holding plate 41 attached to the opening edge of the opening 10 with mounting screws 40, 40. Furthermore, a reed switch 42 is attached between the lower part of the printed circuit board 38 and the partition wall 8. on the other hand,
The valve chamber 5 has a known large armrest 43 and a small armrest 4.
A crank mechanism 45 consisting of 4 is provided. The armrest 44 is close to the lower surface of the partition wall 8, and a magnet 47 is fixed to the upper surface of the armrest 44 by a holder 46. Therefore, this magnet 47 is moved only once by the rotation movement of the small armrest 44 to the reed switch 42.
The reed switch 42 is configured to be turned on by magnetic force when facing the reed switch 42, and constitutes a flow rate sensor 48 that detects an abnormal flow rate by counting the pulses.

Furthermore, a mounting portion 49 facing the opening 10 is provided on the outflow port 7 side of the electronic component chamber 9 . A known vibration sensor 50 is removably attached to this attachment portion 49 with an attachment screw 51. Further, a mounting hole 52 is bored in the partition wall 8 in front of the outlet 7 so as to communicate with the valve chamber 5. And this mounting hole 52
A pressure sensor 5 detects the gas pressure in the valve chamber 8.
3 is inserted from the bottom. In addition, 54 is an LED that notifies when the shut-off device 21 shuts off.
It is.

The flow rate sensor 48, the seismic sensor 50, and the pressure sensor 53 are electrically connected to the control circuit 39 by a traffic light (not shown), and the control circuit 39 is configured to control the cutoff device 21. has been done.

Next, the operation of the gas meter with a shutoff device configured as described above will be explained. First, in normal use, the coil 26 of the self-holding solenoid 22 of the disconnection device 21 is in a non-energized state, so the plunger 23 overcomes the restoring force of the spring 25 and is attracted to the magnet 28.
Therefore, the valve body 24 is separated from the movable valve seat 16 and is in an open state, and gas flows through the inlet 6 and the flow path 1.
8, the gas flows in the order of valve chamber 8, metering chamber 4 and outlet 7, and the flow rate of this gas is controlled by a settlement mechanism (not shown).
will be instructed.

In this way, in normal use, when any of the abnormality detectors among the flow rate sensor 48, seismic sensor 50, and pressure sensor 53 detects an abnormality, the output signal is sent as an activation signal to the shutoff device 21 via the control circuit 39. is input. That is, when the coil 26 of the self-holding solenoid 22 is instantaneously energized and a reverse magnetic field is applied, the attraction of the magnet 28 is released. Therefore, the plunger 23 protrudes due to the restoring force of the spring 25, and the valve body 24 comes into pressure contact with the movable valve seat 16 to close the valve. And spring 2
The restoring force of 5 holds the valve in the closed state, and the inlet 6
Gas that is about to flow into the gas meter is blocked, and gas leakage in abnormal situations can be prevented.

In addition, when the abnormal condition is resolved and you want to use the gas appliance again, loosen the cap 35 and remove it.
Press the return button 32 with your finger. and,
The push rod 3 resists the restoring force of the return spring 34.
3 is pushed in, and the valve body 24 is pushed in against the restoring force of the spring 25 by the movable valve seat 16 provided at the tip thereof. By pushing the push rod 33, the plunger 23 is connected to the magnet 28.
When the valve body 24 comes into contact with the movable valve seat 16, it is held by the attraction force of the magnet 28, and the valve body 24 is held in a state separated from the movable valve seat 16, that is, in an open state.
When you release your finger from the return button 32, the push rod 33 returns to its original state due to the restoring force of the return spring 34, and in this state, the cap 35 is returned to the cylindrical body 3.
1, the return operation is completed.

In addition, when performing maintenance and inspection of various electronic components and abnormality detectors provided in the electronic component chamber 9, the lid 12 on the back of the electronic component chamber 9 is removed and the opening 1 is removed.
This can be done by opening 0.
That is, the lid body 12 is removed by loosening the mounting screws 13, and the holding plate 41 is removed by loosening the mounting screws 40, 40. As a result, the shutoff device 2
1. The seismic sensor 50 can be removed to the rear, and the printed circuit board 38 is attached to the guide members 37, 37.
It can be pulled out backwards along the

Note that in the above embodiment, the movable valve seat 16
Although the sealing material 17a is provided to seal the space between the movable valve seat 16 and the cylinder body 15, the sealing material 17a is not necessary if the movable valve seat 16 is made of a material that has a sealing effect.

[Effect of idea]

As explained above, according to this invention, a movable valve seat is provided on the push rod that moves forward when the return button is pressed, and the movable valve seat blocks the flow path, unless the push rod is moved back together with the return button. This is because the flow path is configured so that it does not open. Therefore, even if you keep pressing the reset button inadvertently, the fluid flow path will be completely blocked, improving safety and making it possible to close the flow port in the event of an abnormality such as a gas leak or an earthquake. It has the effect of being able to block it.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention.
The figure is a rear view of a gas meter with a shutoff valve device, FIG. 2 is a cross-sectional plan view, FIG. 3 is a vertical cross-sectional view of a self-holding solenoid, and FIG. 4 is a cross-sectional plan view of a conventional shut-off valve device. 15... Cylindrical body, 16... Movable valve seat, 17... Seal material, 18... Flow path, 22... Self-holding solenoid (holding mechanism), 24... Valve body, 25...
Spring, 33...Putshiyurotsudo.

Claims (1)

[Scope of utility model registration request] a cylindrical body constituting a fluid flow path; a movable valve seat inserted into the cylindrical body and movable back and forth in the axial direction; A valve body that opens and closes the flow passage, a spring that biases the valve body in the valve opening direction, a holding mechanism that holds the valve body in the open state against the restoring force of the spring, and the movable valve seat. A shutoff valve device comprising: a push rod which is connected to the valve body and can move forward and backward to press a movable valve seat against the valve body to keep the flow passage closed during a return operation of the valve body.