JPH0526365A - Gas cut-off valve device - Google Patents

Abstract

PURPOSE:To integrate a cut-off operation mechanism section with a restoration actuating mechanism section so as to be made small in size in a gas cut-off valve device to be housed in a gas meter. CONSTITUTION:A device is provided with a stationary valve seat 21, a valve body 22 which is freely brought into contact therewith and is also freely separated therefrom while being faced to the stationary valve seat 21, and with a plunger 23 which includes a hollow section 23A and an axial direction through hole 23B communicated with the hollow section, wherein the valve body 22 is fitted onto the tip end of the hollow section via a backing plate 24. The device is also provided with a hollow section 23A, a restoring bar 34 which is inserted through the axial direction through hole 23B while being furnished with a hook section 34A at one end and with a handle 4B at the other end, and is provided with a bobbin 29 on which an electromagnetic coil 30 is wound. Furthermore, the device consists of a stationary iron core 28 which is housed in the hollow section of the bobbin 29 together with the plunger 23, an iron piece 31 surrounding the outer circumference of the plunger, a permanent magnet 32 surrounding the iron piece 31 again, a yoke 27, a coil spring 26, and of a restoring spring 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shutoff valve device attached to a gas meter or the like for shutting off the flow of gas in the event of an emergency such as a gas leak.

[0002]

2. Description of the Related Art FIG. 10 is a cross-sectional view of a conventional gas cutoff valve device. Then, a plunger 3 which is moved by the magnetic flux thereof is a valve element 3 attached to the tip of the plunger 2, a coil spring 4 for urging the valve element 3 in a valve closing direction, and a valve element 5 facing the valve element 3. Fixed valve seat, 6 is a movable valve seat on the inner circumference of the fixed valve seat 5, 7
Is an O-ring as a sealing material that keeps the fixed valve seat 5 and the movable valve seat 6 airtight, and constitutes an shutoff operation mechanism of the gas shutoff valve device. On the other hand, 8 is an inner cylinder, 9 is a inside of the inner cylinder 8 and has a return button 10 at one end and the other end is connected to the bottom surface of the movable valve seat 6, and 11 is a return rod in the backward direction. Return spring to urge, 12 is a return button 1
A detachable cap that covers 0 and constitutes a return operation mechanism. Reference numeral 13 is a partition wall forming a gas flow path.

In the gas cutoff valve device shown in FIG. 10 in the open state, a cutoff signal is input to the solenoid coil 1A of the self-holding solenoid 1 in case of an emergency such as gas leak. As a result, an electric current flows through the solenoid coil 1A, and the magnetic flux generated at this time causes the plunger 2 to descend and the valve body 3 to abut on the fixed valve seat 5 and the movable valve seat 6 to close the valve. When the emergency situation such as gas leak is recovered, the shutoff signal disappears, and the magnetic flux pushing down the valve body 3 disappears. Then, when the cap 12 is removed and the return button 10 is pushed in, the other end of the return rod 9 pushes up the movable valve seat 6 and the valve body 3 moves to the plunger 2
Is lifted and its upper end surface is attracted to the permanent magnet 1B, and the valve is opened.

[0004]

In the structure described above, the shut-off operation mechanism portion including the valve body and the return operation mechanism portion including the movable valve seat are separate bodies, and the operation directions thereof are on the same axis. Therefore, its axial length becomes large. Therefore, there is also a problem that the mounting position is limited due to the structure of the gas meter.

The object of the present invention is to solve the above-mentioned problems.
An object of the present invention is to provide a miniaturized gas cutoff valve device by integrating a shutoff operation mechanism portion and a return operation mechanism portion.

[0006]

In order to achieve the above object, the present invention has a fixed valve seat, a valve body which is provided to face the fixed valve seat and which can be connected and separated, and a plunger which supports the valve body. A coil spring for urging the valve body in the valve closing direction, a permanent magnet device for urging the valve body in the valve opening direction against the coil spring, and a magnetic flux for canceling the magnetic flux of the permanent magnet device. The plunger has a hollow portion and an axial through hole communicating with the hollow portion. The return rod having a hook portion at one end of the hollow portion and the axial through hole has a hook portion inside the hollow portion. And a return spring for urging the return rod in the valve opening direction. Further, in such a structure, the permanent magnet device for urging the valve element in the valve opening direction has an iron piece surrounding the outer periphery of the plunger, a permanent magnet further surrounding the iron piece, a yoke surrounding the permanent magnet, and the plunger. A fixed iron core arranged opposite to the end face is provided, and the electromagnet device that acts to cancel the magnetic flux of the permanent magnet device includes an electromagnetic coil wound around a bobbin arranged around the plunger. Furthermore, the valve body is supported by the plunger via the receiving plate.

As another structure, a fixed valve seat, a valve body provided facing the fixed valve seat, which can be freely contacted and separated, a plunger for supporting the valve body, and the valve body in a valve closing direction. A coil spring for urging, a permanent magnet device for urging the valve body in the valve opening direction against the coil spring, and an electromagnet device for canceling the magnetic flux of the permanent magnet device are provided. It is assumed that a return rod having an adsorption portion for adsorbing the plunger at its end and a return spring for urging the return rod in the valve opening direction are provided. Further, in such a configuration, the attraction portion of the return rod is integrally formed with the fixed iron core of the electromagnet device.

[0008]

According to the above-mentioned structure, the return rod of the return operation mechanism is housed and integrated in the plunger forming the cutoff operation mechanism portion. According to another structure, the cutoff operation mechanism portion is provided. Since the plunger and the return rod of the return operation mechanism portion are integrated by the suction portion of the return rod, the entire apparatus can be downsized. Therefore, when it is mounted on the gas meter, the mounting position is less restricted.

[0009]

1 is a cross-sectional view of a gas cutoff valve device according to an embodiment of the present invention, in which a fixed valve seat 2 provided on a partition wall 20 is shown.
The valve body 22 which comes into contact with and separates from the No. 1 is connected to the tip of the hollow portion 23A of the plunger 23 having the hollow portion 23A and the axial through hole 23B communicating with the hollow portion 23A via the receiving metal 24. The receiving plate 24 and the mounting plate 25 provided on the partition wall 20
A coil spring 26 for urging the valve element 22 in the valve closing direction is fitted between and, and a yoke 27 is fixed to the mounting plate 25. A bobbin 29 surrounding the fixed iron core 28 and the plunger 23, which abuts the tip of the axial through hole 23B of the plunger 23, is housed inside the yoke 27, and an electromagnetic coil 30 is wound around the bobbin 29. The plunger 23 is projected downward from the mounting plate 25. Inside the yoke 27, an iron piece 31 surrounding the plunger 23 and a permanent magnet 32 surrounding the iron piece 31 are further housed together with a spacer 33. The hollow portion 23A of the plunger 23 and the axial through hole 2
A return rod 34 is inserted through 3B, a hook portion 34A is provided at one end thereof, and a knob portion 34B is provided at the other end thereof. A return spring 35 is fitted into the return rod 34 of the knob portion 34B in a compressed state, and a cap 36 is put on this portion. In such a state, the movable distance L of the hook portion 34A is larger than the stroke distance 1 of the valve body 22, and the shutoff operation mechanism portion and the return operation mechanism portion are integrated.

The operation of the gas cutoff valve device will be described below.
When a cutoff signal is input to the electromagnetic coil 30, a magnetic flux is generated, which circulates to the fixed iron core 28-plunger 23-iron piece 31-permanent magnet 32-yoke 27-fixed iron core 28 to cancel the magnetic flux circulated by the permanent magnet 32. As a result, the suction force of the fixed iron core 28 is lost. Therefore, the plunger 23 is lowered by the spring force of the coil spring 26, and the valve body 22 comes into contact with the fixed valve seat 21 to close the valve. This state is shown in FIG. Next, when the cutoff signal disappears, the return operation is performed. When the knob portion 34B is grasped with a finger and pulled up, the plunger 23 is attracted to the fixed iron core 28 which is attracted by the magnetic flux from the permanent magnet 32. The valve is opened. This state is shown in FIG. Then the knob 34B
When the finger holding is released, the return rod 34 returns to the state of FIG. 1 by the spring force of the return spring 35.

FIG. 4 is a sectional view of a gas cutoff valve device according to a second embodiment of the present invention. The same parts as those of the first embodiment shown in FIG. 1 are designated by the same reference numerals. The difference between the second embodiment and the first embodiment is the shape of the return rod 34.
That is, the return rod 34 has the knob portion 34B at the other end and the attraction portion 34C made of a magnetic material at the one end. In the state where the return rod 34 is assembled, the attracting portion 34C is assembled so as to be located between the lower surface of the fixed iron core 28 of the electromagnet device and the upper surface of the plunger 23. As a result, the hollow portion 23A (see FIG. 1) provided in the plunger 23 becomes unnecessary.

When the shutoff signal is input to the electromagnetic coil 30 in the gas shutoff valve device in the valve open state shown in FIG. 4, a magnetic flux is generated in the electromagnet device, which generates a fixed iron core 28-adsorption part 34C-plunger 23-iron piece 31-permanent magnet. 32-Yoke 27-Fixed iron core 2 by canceling the magnetic flux circulating to the fixed iron core 28
8. The attraction force between the attraction portion 34C and the plunger 23 disappears, and the attraction force of the return spring 35 causes the attraction portion 34C.
Remains in close contact with the fixed iron core 28, and only the plunger 23 is lowered by the spring force of the coil spring 26 to close the valve (FIG. 5). Next, as shown in FIG. 6, when the knob portion 34C is pushed in the direction of the arrow P with a flat hand, the magnetic flux from the permanent magnet 32 is absorbed by the permanent magnet 32--the yoke 27--the return rod 34--.
Adsorption part 34C-plunger 23-iron piece 31-permanent magnet 3
2, and the suction portion 34C is sucked onto the upper surface of the plunger 23. If the attraction force and the restoring force of the return spring 35 are set to be larger than the force of the coil spring 26 for urging the valve body 22, the plunger 23 is moved to the attraction portion 24C when the finger pressing the knob portion 34B is released. While adsorbed, the valve returns to the open position as shown in FIG. In order to increase the attraction force when the return rod 34 is pushed, the return rod 34 and the attraction portion 34C are made of a magnetic material having a high magnetic permeability.

FIG. 7 is a sectional view of a gas cutoff valve device according to a third embodiment of the present invention. The same parts as those of the first embodiment shown in FIG. 1 and the second embodiment shown in FIG. The code is attached. The third embodiment differs from the second embodiment in that the fixed iron core of the electromagnet device and the suction portion 34D of the return rod are integrated and the thickness thereof is increased. That is, the thickness dimension of the suction portion 34D is obtained by adding the thickness dimension of the fixed iron core 28 to the thickness dimension of the suction portion 34C in FIG.
The suction portion 34D has the function of the fixed iron core 28.

The operation of the gas cutoff valve device having no fixed iron core will be described. When a cutoff signal is input to the electromagnetic coil 30, a magnetic flux is generated, and this magnetic flux attracts the magnet 34D-plunger 23-iron piece 31-permanent magnet 32. -Yoke 27-Adsorption portion 34D by canceling the magnetic flux circulating to the adsorption portion 34D
The attraction force between D and the plunger 23 disappears, and the attraction force of the return spring 35 causes the attraction portion 34D to remain in close contact with the yoke 27, so that only the plunger 23 descends due to the spring force of the coil spring 26 to close the valve. (Fig. 8). Next, as shown in FIG. 9, when the knob portion 34D is pushed in the direction of the arrow Q with the open hand, the magnetic flux from the permanent magnet 32 is absorbed by the permanent magnet 32--yoke 27--return rod 34--adsorption portion 34D--.
It circulates to the plunger 23-iron piece 31-permanent magnet 32,
The suction portion 34D is sucked onto the upper surface of the plunger 23. If the attraction force and the restoring force of the return spring 35 are set to be larger than the force of the coil spring 26 for urging the valve body 22, the plunger 23 is moved to the attraction portion 34D when the finger pressing the knob portion 34B is released. Figure 7 while adsorbed
Return to the valve open position as shown in.

[0015]

According to the present invention, the valve body in the closed state can be returned to the open state by a simple manual operation, and the shut-off operation mechanism portion and the return operation mechanism portion are integrated so that the size is small. It is possible to realize cost reduction and cost reduction, and there is an advantage that the storage location is not limited by the structure of the stored gas meter.

[Brief description of drawings]

FIG. 1 is a sectional view of a gas cutoff valve device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a closed state (shutoff state) of the gas shutoff valve device shown in FIG.

FIG. 3 is a cross-sectional view of the gas cutoff valve device shown in FIG. 1 when it returns to an open state.

FIG. 4 is a sectional view of a gas cutoff valve device according to a second embodiment of the present invention.

5 is a cross-sectional view showing a closed state of the gas cutoff valve device shown in FIG.

FIG. 6 is a cross-sectional view showing a state in which the knob portion of the gas cutoff valve device in the state shown in FIG. 5 is pushed in the P arrow direction.

FIG. 7 is a sectional view of a gas cutoff valve device according to a third embodiment of the present invention.

8 is a sectional view showing a closed state of the gas cutoff valve device shown in FIG. 7.

9 is a cross-sectional view showing a state where the knob portion of the gas cutoff valve device in the state shown in FIG. 8 is pushed in the direction of arrow Q. FIG.

FIG. 10 is a sectional view of a conventional gas cutoff valve device.

[Explanation of symbols]

21 Fixed valve seat 22 valve body 23 Plunger 23A hollow part 23B Axial through hole 24 Money 26 coil spring 27 York 28 Fixed iron core 29 bobbins 30 electromagnetic coil 31 Iron pieces 32 permanent magnet 34 Return bar 34A Hook part 34B knob part 34C adsorption part 34D adsorption part 35 Return spring

Claims (6)

[Claims] Claims: 1. A fixed valve seat, a valve body provided facing the fixed valve seat, which is freely movable, a plunger for supporting the valve body, and a coil for urging the valve body in a valve closing direction. The plunger includes a spring, a permanent magnet device that biases the valve body in the valve opening direction against the coil spring, and an electromagnet device that acts to cancel the magnetic flux of the permanent magnet device. And a return rod having an axial through hole communicating with this and having a hook portion at one end in the hollow portion and the axial through hole, such that the hook portion is inserted into the hollow portion, and the return rod is A gas cutoff valve device, comprising a return spring for urging in a valve opening direction. 2. A permanent magnet device for urging a valve element in a valve opening direction according to claim 1, wherein an iron piece surrounding the outer periphery of the plunger, a permanent magnet further surrounding the iron piece, and a permanent magnet surrounding the permanent magnet. A gas cutoff valve device comprising: a yoke; and a fixed iron core arranged to face the end face of the plunger. 3. The electromagnet device according to claim 2, wherein the electromagnet device that acts to cancel the magnetic flux of the permanent magnet device comprises an electromagnetic coil wound around a bobbin arranged around the plunger. Gas shutoff valve device. 4. The gas cutoff valve device according to claim 1, 2 or 3, wherein the valve element is supported by the plunger through a receiving member. 5. A fixed valve seat, a valve body which is provided facing the fixed valve seat and can be separated from and attached to the fixed valve seat, a plunger for supporting the valve body, and a coil for urging the valve body in a valve closing direction. The plunger includes a spring, a permanent magnet device that biases the valve body in the valve opening direction against the coil spring, and an electromagnet device that acts to cancel the magnetic flux of the permanent magnet device. A return rod having an adsorption portion for adsorbing
A gas cutoff valve device comprising a return spring for urging the return rod in the valve opening direction. 6. The gas cutoff valve device according to claim 5, wherein the adsorption portion of the return rod is formed integrally with the fixed iron core of the electromagnet device.