KR100447571B1 - Apparatus for Shutoff of Gas Leakage - Google Patents

Abstract

According to the present invention, when a gas leaks from a gas appliance or a gas pipe, the gas leak is automatically detected and notified to the user, and at the same time, the user does not properly recognize the gas leak by blocking the gas supply to the gas appliance. A new gas leak shutoff device that ignores gas leak warnings and prevents gas leaks from occurring even when gas appliances are used.

In the present invention, a gas leakage blocking device for automatically detecting the gas leakage by detecting the gas leakage, is installed in the gas inlet pipe and opened or closed by an electrical signal to allow or block the gas inlet to the gas inlet pipe A shutoff valve; A decompression unit into which the gas supplied through the shutoff valve is introduced; A diaphragm that expands or contracts with the pressure of the gas introduced into the decompression unit; A motion transmission shaft that performs forward or reverse motion in association with expansion or contraction of the diaphragm; By controlling the supply to the shut-off valve by turning on / off in conjunction with the movement of the exercise transmission shaft, when the exercise transmission shaft is in the maximum forward movement position is turned off to cut off the power supply to the shutoff valve and the exercise transmission shaft A shut-off valve operation switch which is turned on when the movement is performed in the reverse direction and permits energization to the shut-off valve; By controlling on / off in conjunction with the movement of the exercise transmission shaft to control the supply of electricity to the shut-off valve operation switch, when the movement transmission shaft is in the forward movement is turned on to allow the energization to the shut-off valve operation switch, the switch A balance switch which is turned off when the movement transmission shaft moves in the reverse direction while the hold mechanism is turned off, and blocks the energization of the shutoff valve operation switch; A switch hold mechanism which is turned on when the operation switch of the gas appliance is operated for the first time or when the operation switch is operated in the direction of increasing the gas consumption of the gas appliance to maintain the on state of the balance switch; A gas leakage display device electrically connected in parallel with the balance switch to display a gas leakage fact; Due to the leakage of gas, the diaphragm contracts due to a decrease in the gas pressure in the decompression unit, and accordingly, the movement transfer shaft moves in the reverse direction, so that the balance switch is turned off to block the energization to the shutoff valve, thereby automatically shutting off the shutoff valve. At the same time, a gas leakage blocking device is provided which displays a gas leakage fact by operating a gas leakage display device.

Description

Apparatus for Shutoff of Gas Leakage}

The present invention relates to a gas leakage blocking device and a method for automatically shutting off a gas supply when a gas leaks while the gas appliance is not used or is in use, and specifically, a gas leak according to a supply pressure of a gas using a constant pressure regulator. The present invention relates to a power-saving gas leakage blocking device using a pressure regulator that can cut off the gas supply quickly and determine the amount of electricity consumed to maintain the device.

In using gas appliances such as gas stoves and gas boilers, the most important thing is safety against gas leakage. If a gas is leaked from the gas appliance itself or a pipe supplying gas to the gas appliance, a user may ignite the gas appliance or use another fire, which may cause serious accidents due to the explosion of the leaked gas.

In order to prevent an accident due to such a gas leak, a gas leak detector has been developed that detects a gas leak and alerts the user, but such a conventional gas leak detector detects a gas leak by a chemical method. The function is only to warn the user of the gas leakage, so if the user does not recognize or ignore the gas leakage warning, the risk of an accident due to gas leakage still exists.

The present invention overcomes the limitations of the conventional gas leak detector, and automatically detects and informs the user of the gas leak when the gas leaks from the gas appliance or the gas pipe, and simultaneously cuts off the gas supply to the gas appliance. It is an object of the present invention to provide a new gas leakage blocking device that prevents an accident caused by a gas leak even if a user does not properly recognize a gas leak or ignores a gas leak warning and uses a gas appliance.

1 is a schematic diagram illustrating a mechanical structure of an embodiment of a gas leakage blocking device according to the present invention.

2 is a circuit diagram for explaining the electrical configuration of the gas leakage blocking device according to the present invention.

<Brief description of the main parts of the drawing>

1 Thermal protection element 2 Leak detection switch

3 hold switch 4 reset switch

5 Balance switch 6 Shutoff valve operation switch

7 Shutoff valve 8 Hold coil

9 Gas leak display device 10 Main body

11 Diaphragm 12 Pressure Reducing Part

13 Movement transmission shaft 40 Gas inflow control valve

In order to achieve the above object, in the present invention, a gas leakage blocking device for detecting a gas leak and automatically shut off the gas inflow, which is installed in the gas inlet pipe and opened or closed by an electrical signal to the gas inlet pipe. A shutoff valve that permits or blocks gas inflow; A decompression unit into which the gas supplied through the shutoff valve is introduced; A diaphragm that expands or contracts with the pressure of the gas introduced into the decompression unit; A motion transmission shaft that performs forward or reverse motion in association with expansion or contraction of the diaphragm; By controlling the supply to the shut-off valve by turning on / off in conjunction with the movement of the exercise transmission shaft, when the exercise transmission shaft is in the maximum forward movement position is turned off to cut off the power supply to the shutoff valve and the exercise transmission shaft A shut-off valve operation switch which is turned on when the movement is performed in the reverse direction and permits energization to the shut-off valve; By controlling on / off in conjunction with the movement of the exercise transmission shaft to control the supply of electricity to the shut-off valve operation switch, when the movement transmission shaft is in the forward movement is turned on to allow the energization to the shut-off valve operation switch, the switch A balance switch which is turned off when the movement transmission shaft moves in the reverse direction while the hold mechanism is turned off, and blocks the energization of the shutoff valve operation switch; A switch hold mechanism which is turned on when the operation switch of the gas appliance is operated for the first time and when the operation switch is operated in the direction of increasing the gas consumption of the gas appliance to maintain the on state of the balance switch; A gas leakage display device electrically connected in parallel with the balance switch to display a gas leakage fact; Due to the leakage of gas, the diaphragm contracts due to a decrease in the gas pressure in the decompression unit, and accordingly, the movement transfer shaft moves in the reverse direction, so that the balance switch is turned off to block the energization to the shutoff valve, thereby automatically shutting off the shutoff valve. At the same time, a gas leakage blocking device is provided which displays a gas leakage fact by operating a gas leakage display device.

In the present invention as a specific embodiment of the gas leakage blocking device the movement transmission axis moves vertically; The shutoff valve operation switch is a contact that is released when the movement transmission shaft is raised to the highest point, and is in contact with each other when the movement transmission shaft is lowered, and the contact in conjunction with the movement of the movement transmission shaft There is provided a gas leakage shutoff device comprising an operation bar for contacting or releasing contact.

In addition, as an embodiment of the present invention, the balance switch, when the upper contact of the fixed position and the movement transmission shaft is raised to rise together to come in contact with each other and the upper contact is turned on in the off state of the switch hold mechanism When the motion transfer shaft is lowered down is provided with a gas leakage blocking device characterized in that the lower contact is configured to be lowered off to come off the contact with the upper contact.

In a specific embodiment of the present invention, the switch holding mechanism is a hold switch which is turned on when the operation switch of the gas appliance is operated for the first time or when the operation switch is operated in the direction of increasing the gas consumption of the gas appliance, and the hold switch. When it is turned on, it is energized to perform the function of the electromagnet, and it is comprised by the hold coil which applies a force so that the contact of the said balance switch may be mutually pulled, and maintains the said ON state of the said balance switch.

In the present invention, a compression spring may be further provided on one side of the diaphragm to apply a force to contract the diaphragm by reducing the gas pressure of the decompression unit.

In addition, in the present invention, the decompression unit may be further provided with a gas flow rate control valve for controlling the amount of gas flowing through the inlet by controlling the opening degree of the inlet in conjunction with the movement of the diaphragm.

As another embodiment of the present invention, the gas inlet flow control valve is provided with a parabolic tapered tip portion for reducing or expanding the inlet by entering or retracting, and one end is connected to the diaphragm There may be composed of an intermediate for advancing or retracting the valve body in accordance with the movement of the diaphragm.

Hereinafter, a detailed configuration and an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a schematic cross-sectional view showing an example of a specific mechanical configuration of an embodiment of a gas leakage blocking device according to the present invention, Figure 2 is an electrical system for an embodiment of the gas leakage blocking device according to the present invention A circuit diagram is shown.

As shown in FIG. 1, the gas leakage blocking device includes a main body 10 having a diaphragm 11 formed therein and a pressure reducing unit 12 formed below the diaphragm 11. have. The decompression unit 12 is formed with an inlet 21 through which the gas flows in through the gas inlet pipe 23 and an outlet 22 through which the gas to be used flows out. The gas introduced through the gas inlet pipe 23 and the inlet 21 is filled in the decompression unit 12, and then flows out through the outlet 22, and the gas flowing out through the outlet 22 is the gas outlet tube 24. Is consumed as it is transported to a gas appliance, for example, a domestic gas range or the like, and ignited. In the normal state in which there is no gas leakage, the gas inflow amount flowing through the inlet port 21 and the gas outflow amount flowing out through the outlet port 22 are equal to each other and are balanced.

Between the gas inlet pipe 23 and the inlet 21 is provided with a shutoff valve (7) for blocking the inflow of gas, blocking the gas flowing into the inlet (21) if necessary through the configuration and operation described below do. As the shutoff valve 7, an electrically operated solenoid valve may be used. However, it is not necessarily limited thereto.

In addition, the inlet 21 is provided with a gas inlet flow control valve 40, the configuration and operation relationship of the gas inlet flow control valve 40 will be described later.

The diaphragm 11 expands or contracts in conjunction with the pressure of the gas introduced into the decompression unit 12. The diaphragm 11 is provided with an exercise transmission shaft 13 which moves in synchronization with the movement of the diaphragm 11 to the opposite side of the decompression unit 12. When the diaphragm 11 moves according to the pressure of the decompression unit 12, the exercise transmission shaft 13 moves in conjunction with the movement of the diaphragm 11. . In the present specification, the pressure of the decompression unit 12 is increased so that the movement direction of the movement transmission shaft 13 when the diaphragm 11 expands is referred to as a "forward" movement, and conversely, the pressure of the decompression unit 12 decreases. Thus, the movement direction of the motion transmission shaft 13 when the diaphragm 11 contracts is referred to as "reverse" motion.

In addition, the state in which the diaphragm 11 expands in the present specification refers to a state in which the diaphragm 11 moves in a direction opposite to the pressure reducing part 12 due to an increase in the pressure of the pressure reducing part 12, and the diaphragm 11. This contracting state refers to a state in which the pressure in the decompression unit 12 decreases and the diaphragm 11 moves in the direction of the decompression unit 12.

In the case of the embodiment shown in Figure 1, the movement transmission axis 13 is installed vertically, the movement transmission axis 13 also moves up and down linearly in accordance with the vertical movement of the diaphragm (11). In addition, the side of the diaphragm 11 is provided with a movement transmission shaft 13 is provided with a compression spring 14 for applying a compression spring force toward the decompression unit 12. In the embodiment of FIG. 1, the upward movement of the exercise transmission shaft 13 corresponds to the "forward movement", and the downward movement corresponds to the "reverse movement".

One side of the main body 10 is provided with a switch unit 30. The switch unit 30 has a shutoff valve operating switch 6 for controlling the operation of the shutoff valve 7 in association with the pressure of the pressure reducing unit 12, the movement of the diaphragm 11, and the movement of the movement transmission shaft 13. ) And a balance switch 5 are formed. In the embodiment shown in Figure 1, the switch unit 30 is mounted on the upper portion of the main body 10, the movement transmission shaft 13 is penetrated into the case 31 of the switch unit 30 It is inserted. The shut-off valve operation switch 6 for controlling the operation of the shut-off valve 7 is mounted on the case 31 of the switch unit 30 to be turned on / off by the movement of the exercise transmission shaft 13. In the embodiment shown in Fig. 1, the shut-off valve actuation switch 6 is the operating bar 32 mounted on the top of the movement transmission shaft 13 and the contact 33 in contact with each other by the operating bar 32 ) The right end of the operating bar 32 is hinged so that when the movement transmission shaft 13 is raised to the highest point, the left end of the operating bar 32 is pushed up to release the contact of the contact 33 and turn off. When the motion transmission shaft 13 is lowered, the left end of the operation bar 32 is lowered, and the contacts 33 are configured to be turned on by contacting each other. However, the above configuration is only one configuration example of the shutoff valve operation switch 6, and may be configured in the reverse direction. For example, it has a micro switch that is turned off when pressed and turned on when it is not pressed, and when the movement transmission shaft 13 is raised by hinged the center of the operation bar, one side is pushed up to press the micro switch to the other side. When the exercise transmission shaft 13 is lowered, one side may be lowered and the other side may be lifted again so as not to press the micro switch. In this way, the mechanical configuration of the shut-off valve operation switch 6 is not necessarily limited to those illustrated above, there may be various modifications.

The important point in the apparatus of the present invention is, as will be described later, by the forward movement of the movement transfer shaft 13 when the diaphragm 11 expands due to the gas pressure of the decompression unit 12, the movement transfer shaft 13 ) Reaches the maximum forward movement position (in the embodiment of FIG. 1, when the movement transmission shaft 13 has risen to the highest point), the shutoff valve operation switch 6 is turned off, and the gas pressure of the decompression unit 12 is reduced. This decrease is such that the shutoff valve operation switch 6 is configured to be turned on by the reverse movement of the movement transmission shaft 13 when the diaphragm 11 contracts. According to the on / off state of the shutoff valve operation switch 6, the energization state to the shutoff valve 7 is connected / disconnected so that the shutoff valve 7 is opened / closed.

The balance switch 5 controls the supply of electricity to the shut-off valve actuation switch 6 by turning on / off in conjunction with the movement of the movement transmission shaft 13. In the embodiment shown in FIG. 1, the balance switch 5 includes a magnetic iron piece 16 and an insulating sleeve 17 placed thereon, and a lower contact 18 and an upper contact 19 provided on the insulating sleeve 17. It is composed of The upper contact 19 is formed under the upper insulating plate 20. The magnetic iron piece 16, the insulating sleeve 17 and the lower contact 18 moves together with the movement of the movement transfer shaft 13 to contact the upper contact 19 to turn on the balance switch 5. That is, when the exercise transmission shaft 13 is raised, the lower contact point 18 also increases in contact with the upper end contact point 19 and turns on the balance switch 5 in contact with the upper contact point 19. On the contrary, when the movement transmission shaft 13 is lowered, the lower contact 18 is also lowered in conjunction with the motion transfer shaft 13 and the balance switch 5 is turned off by being separated from the upper contact 19. When the balance switch 5 is turned on, energization to the shutoff valve operation switch 6 is permitted.

However, the above configuration is only one configuration example of the balance switch 5, and may be configured differently from the above. The important point in the apparatus of the present invention is that, as described later, the balance switch 5 by the forward movement of the movement transfer shaft 13 when the diaphragm 11 expands due to the gas pressure of the decompression unit 12. Is turned on, and the balance switch 5 is turned off by the reverse movement of the movement transmission shaft 13 when the diaphragm 11 contracts due to the decrease in the gas pressure of the pressure reducing unit 12, The specific mechanical configuration of the balance switch 5 having such a configuration can be modified in various ways.

On the other hand, as will be described later in the present invention, the lower contact 18 and the upper contact, even if the movement transmission axis 13 moves in a direction in which the lower contact 18 and the upper contact 19 are separated from each other. It is necessary to maintain the contact state of (19) to maintain the on state of the balance switch (5), for which a switch hold mechanism is provided. In the embodiment shown in FIG. 1, the switch holding mechanism is composed of a hold coil 8 provided on the upper insulating plate 20 and a hold switch 3 for controlling the power supply of the hold coil 8. . When the hold switch 3 is turned on to supply power to the hold coil 8, the hold coil 8 functions as an electromagnet to generate a magnetic force, and the magnetic force acts as a tensile force against the magnetic iron piece 16. Regardless of the movement of the exercise transmission shaft 13, the contact state of the lower contact 18 and the upper contact 19 is maintained so that the balance switch 6 can be kept on. As a specific embodiment, a silver contact having a circular frame shape may be used as the lower contact 18. The hold switch 3 is preferably mounted in combination with the operation switch of the gas appliance to operate in conjunction with the operation switch operation of the gas appliance to burn the gas.

Next, the structure of the gas inflow amount control valve 40 is demonstrated. The gas inflow amount control valve 40 is provided in the pressure reducing unit 12 to control the opening degree of the inlet port 21 in association with the movement of the diaphragm 11. The gas inflow control valve 40 has a valve body 41 having a parabolic tapered tip portion and one end thereof is connected to the diaphragm 11 so that the valve body (10) moves according to the movement of the diaphragm 11. It consists of the intermediate body 42 which advances and retracts 41). When a large amount of gas is suddenly discharged through the outlet 22 and the diaphragm 11 contracts, the intermediate body 42 retracts the valve body 41 in association with the large amount of the inlet 21 to open more. When the amount of gas flowing out through the outlet 22 decreases, the intermediate body 42 advances the valve body 41 according to the shrinkage reduction degree of the diaphragm 11. By reducing the opening degree of the to reduce the amount of gas flowing in. In particular, in the present invention, the front / rear distance can be amplified by configuring the tip of the valve body 41 in a parabolic shape, and the operation sensitivity is uniform at all positions of the valve body 41.

In FIG. 1, reference numeral 15 denotes an air hole, and when the diaphragm 11 expands due to the pressure of the pressure reducing part 12, the air is discharged so that the diaphragm 11 can be smoothly expanded. Although not shown in the drawing, the outer surface of the main body 10 is provided with an overheat prevention device 1, a leak inspection switch 2, an initialization switch 4, and a gas leakage display device 9, which will be described later. It may be. Of course, the overheat protection device 1, the leak inspection switch 2, the initialization switch 4, the gas leak display device 9 is not necessarily provided in the main body 10, and separately used gas, inlet pipe, outlet pipe It may be provided in the back, etc., there is no particular limitation on the position to be provided.

Next, an electric circuit configuration in the apparatus of the present invention will be described with reference to FIG.

In the circuit diagram of Fig. 2, member No. 1 is an overheat protection element 1, which automatically cuts off power when the apparatus of the present invention is overheated. As the overheat prevention element 1, a fixed bimetal for preventing overheating may be used, and the overheat prevention element 1 is always kept at about 75 ° C. or lower so that power is supplied to the circuit. The member No. 2 is a leak inspection switch 2, and is composed of a transfer switch which can be switched to two positions a and b. It is used to initialize the apparatus of the present invention and check whether the gas leaks before using the gas appliance. Reference numeral 4 is an initialization switch 4, which is used together with the leak inspection switch 2 to initialize the apparatus of the present invention and to confirm gas leakage before using the gas appliance. A return push switch is used as the initialization switch 4.

The reference numeral 3 controls the operation of the hold coil 8 as the hold switch 3, in the embodiment shown in the figure as described above by operating the hold coil 8 in the on state of the hold switch 3 The balance switch 5 is kept in an on state. The hold switch 3 is interlocked with the operation switch of the gas appliance, and when the gas appliance operation switch is operated for the first time to ignite the gas, and when the gas appliance operation switch is operated in the direction of increasing the gas consumption, the hold switch ( 3) turns on, and turns off when the gas appliance operation switch is operated in the direction of reducing the gas consumption, and when the operation of the gas appliance operation switch is stopped. The balance switch 5 is connected in series with the shutoff valve operation switch 6 to control the power supply to the shutoff valve operation switch 6. As the hold switch 3, a hold push switch coupled to an operation switch of a gas appliance may be used, and in some cases, a proximity switch may be used.

Reference numeral 9 denotes a gas leakage display device 9 that warns the user that gas is leaking. In a specific embodiment of the gas leak detection apparatus according to the present invention, the gas leak display device 9 is composed of a lamp that visually informs the gas leakage by lighting, or a voice alarm that informs the gas leakage by voice It can be configured, and the lamp and the voice alarm can be used at the same time. In addition, any device capable of informing a user of a gas leak may be used as the gas leak display device 9.

Next will be described the correlation of the configuration through the specific operation of the gas leakage blocking device according to the present invention.

First, the process of initializing the apparatus of the present invention will be described with reference to FIG. When the power is applied, the overheat protection element 1 is kept at a normal temperature (75 ° C or less). At this time, the pressure reduction part 12 is not filled with gas. Therefore, the diaphragm 11 is in the normal state, and as a result, since the movement transmission shaft 13 is also in the lowered state, the contact valves 33 are in contact with each other, so that the shutoff valve operation switch 6 is in the on state. .

The leak check switch 2 is switched to terminal b for initialization of the device, and the reset switch 4 is turned on for a predetermined short time. For this purpose, the initialization switch 4 is preferably composed of a return push switch. To reset, push this return push switch for about 1 to 2 seconds. Since the shutoff valve operation switch 6 is in the on state, while the reset switch 4 is pressed and turned on, power is supplied to the shutoff valve 7 so that the shutoff valve 7 is opened so that the gas through the inlet 21 is opened. Is introduced into the decompression unit 12. As gas flows into the depressurization unit 12, the pressure in the depressurization unit 12 rises and the diaphragm 11 expands. As a result, the exercise transmission shaft 13 moves upward by moving forward, stops after rising to the highest position. As the movement transmission shaft 13 performs forward movement, the balance switch 5 is turned on, and the movement transmission shaft 13 is brought to the maximum forward movement position, and the shutoff valve operation switch 6 is turned off. That is, in the embodiment of FIG. 1, as the exercise transmission shaft 13 rises, the lower contact 18 also rises and comes into contact with the upper contact 19 so that the balance switch 5 is turned on and the operating bar ( By the hinge action of 32, the contact of the contact 33 is released, and the shutoff valve operation switch 6 is turned off. Since the shutoff valve operation switch 6 is turned off and the power is not supplied, the shutoff valve 7 is closed again to shut off the gas inlet pipe 23 so that no more gas is introduced.

After the above initializing operation is completed, the leak test switch 2 is switched to the terminal a. Even when the leak test switch 2 is switched to the terminal a, the shutoff valve 7 is closed due to the OFF state of the shutoff valve operation switch 6, so that gas is no longer introduced.

If the gas leaks from the gas appliance, the pipe, etc. in the state in which the initializing operation is completed, the gas pressure of the decompression unit 12 is lowered due to the gas leak, and accordingly the diaphragm 11 is caused by the elastic force of the compression spring 14. This contraction causes the motion transfer shaft 13 to perform reverse motion. That is, the exercise transmission shaft 13 is lowered in FIG. The balance switch 5 is turned off by the backward movement of the movement transmission shaft 13 in a state where the hold switch 3 is not turned on. That is, as the movement transmission shaft 13 descends in FIG. 1, the lower and upper contacts 18 and 19 of the balance switch 5 are separated from each other, and the balance switch 5 is turned off. As a result, the gas leakage indicator 9 is operated to inform the user that gas is leaking, and due to the operation of the gas leakage indicator 9, sufficient power is not supplied to the shutoff valve 7. The shutoff valve 7 is closed without operation, thereby preventing further gas from flowing through the inlet 21. The user can recognize the gas leak through the operation of the gas leak display device 9 and can take appropriate measures.

However, at this time, even if the user ignores the operation of the gas leakage display device 9 and uses the gas appliance, the balance switch 5 is already turned off and the power is not supplied to the shutoff valve 7 so that it is shut off. Since the valve 7 is not opened, no gas is introduced into the inlet 21, and accordingly, the gas appliance cannot be used. That is, the gas appliance can not be used at all in the state of gas leakage. Therefore, even if the user is not aware of the gas leak, the use of the gas appliance in the state of continuous gas leakage can be prevented at the source, so that the explosion caused by the use of the gas appliance in the gas leakage state can be prevented in advance. It is safe to be.

On the other hand, when there is no gas leak in the state in which the initialization operation is completed, the user operates the gas mechanism and the gas in the decompression unit 12 is discharged to the outlet 22, and at the same time, the switch hold mechanism operates to balance The on state of the switch 5 is maintained. That is, when the user operates the gas mechanism operation switch (not shown) to operate the gas mechanism, the hold switch 3 is turned on, and power is supplied to the hold coil 8 so that the switch holding mechanism is operated. By operating such a switch holding mechanism, the balance switch 5 is kept in an on state.

Specifically, the power supply hold coil 8 in FIG. 1 functions as an electromagnet to generate a magnetic force, thereby applying a tensile force to the magnetic iron piece 16 to maintain a contact state between the lower contact 18 and the upper contact 19. The on state of the balance switch 5 is maintained. Therefore, even if the gas is discharged to the outlet 22 and the motion transmission shaft 13 is lowered, the balance switch 5 is kept in the on state. On the other hand, when the movement transmission shaft 13 is lowered, the contacts 33 come into contact with each other, and the shutoff valve operation switch 6 is turned on. Since the switch holding mechanism is operated and the balance switch 5 is on, when the shutoff valve operation switch 6 is turned on, energization to the shutoff valve 7 is allowed, so that the shutoff valve 7 is opened and gas is introduced. The user can continue to use the gas appliance. If the user stops the operation of the gas appliance operation switch after adjusting the fire power of the gas appliance to the desired degree, the hold switch 3 is turned off, but the balance switch 5 and the shutoff valve operation switch 6 are already on. Therefore, the open state of the shutoff valve 7 is maintained so that the gas supply is continued, so that the user can continue to use the gas appliance.

If the gas leaks anywhere during use of the gas appliance, the gas outflow amount becomes larger than the gas inflow amount, so that the pressure of the decompression unit 12 is reduced and the diaphragm 11 contracts due to the elastic force of the compression spring 14. The balance switch 5 is thus turned off (in this case the hold switch 3 is off). Since the balance switch 5 is in the off state, the gas leakage display device 9 is turned on, and the shutoff valve 7 is not supplied with sufficient power so that the inflow of gas is blocked by closing the shutoff valve 7. Therefore, if an unintended gas leak occurs during the use of the gas appliance, the gas leakage indicator 9 is notified to the user of the gas leak and the shutoff valve 7 is automatically closed to further inflow of gas. It is automatically blocked.

When the user stops the outflow of the gas through the outlet pipe when the user finishes using the gas appliance, the pressure in the decompression unit 12 is increased so that the movement transmission shaft 13 rises to the maximum forward movement position, that is, the maximum. As the contact point 33 is released and turned off by the bar 32, the power supply to the shutoff valve 7 is stopped, and the shutoff valve 7 is closed to block the inflow of gas.

According to the device of the present invention, since the balance switch 5 is in an on state when a normal gas appliance is used, power is not consumed by the gas leakage display device 9, thereby reducing power consumption.

In the embodiments of the present invention described above, specific examples and mechanical configurations of the switches are not necessarily limited to the above, and as long as the functions described above can be exerted, appropriate elements may be selected and used as design matters.

The gas leakage blocking device of the present invention can be applied not only to domestic gas appliances such as gas stoves, but also to industrial gas appliances.

According to the gas leakage shutoff device of the present invention, when a gas leak is detected, the shutoff valve is automatically operated to shut off the gas supply and shut off the gas supply by any method until there is no further gas leakage. Since the shutoff valve being opened cannot be opened, even if the user does not recognize or ignore the gas leak and operates the gas appliance, the gas leak does not occur.

In the above described the configuration and features of the present invention based on the embodiment according to the present invention, the present invention is not limited to this and can be changed freely according to the technical idea of the present invention.

Claims (6)

Gas leakage blocking device that detects gas leakage and automatically blocks gas inflow, A shutoff valve (7) installed in the gas inlet pipe (23) and open or closed by an electrical signal to allow or block the gas inlet into the gas inlet pipe (23); A pressure reducing unit 12 into which the gas supplied through the shutoff valve 7 flows; A diaphragm 11 which expands or contracts in association with the pressure of the gas introduced into the decompression unit 12; An exercise transmission shaft 13 for forward or backward movement in association with the expansion or contraction of the diaphragm 11; By controlling on / off the movement of the exercise transmission shaft 13 to control the electricity supply to the shut-off valve (7), when the exercise transmission shaft (13) is in the maximum forward movement position is turned off the shutoff valve ( 7) a shut-off valve operation switch 6 which cuts the power supply to the power supply and is turned on when the movement transmission shaft 13 moves in the reverse direction, and permits the power supply to the shut-off valve 7; By controlling the supply of the shutoff valve operation switch 6 by turning on / off in conjunction with the movement of the movement transmission shaft 13, the movement transmission shaft 13 is turned on when the movement is forward, and the shutoff valve operates. A balance switch 5 which permits energization to the switch 6 and turns off when the movement transmission shaft 13 moves in the reverse direction while the switch holding mechanism is turned off, and cuts off electricity to the shutoff valve operation switch 6. )Wow; A switch holding mechanism which is turned on when the operation switch of the gas appliance is operated for the first time and when the operation switch is operated in the direction of increasing the gas consumption of the gas appliance to maintain the on state of the balance switch 5; A gas leak display device (9) electrically connected in parallel with the balance switch (5) to indicate a gas leak fact; Due to the leakage of gas, the diaphragm 11 contracts due to a decrease in the gas pressure in the decompression unit 12. As a result, the movement transmission shaft 13 moves in the reverse direction, so that the balance switch 5 is turned off to shut off the valve. (7) A gas leak cutoff device, characterized in that the shutoff valve (7) is cut off automatically by energizing the gas and the gas leak display device (9) is operated to display the gas leak. The motion transmission axis (13) according to claim 1, wherein the motion transmission axis (13) moves vertically; The shut-off valve operation switch 6 has an operating bar 32 hinged by one side of the shutoff valve operating switch 13 and the movement bar when the movement transmission shaft 13 is raised to the highest point. (32) is lifted off the contact is turned off and when the movement transmission shaft 13 is lowered, the operation bar 32 is characterized by consisting of a contact 33 which is to come back and come in contact with each other Leak Shutoff. The method according to claim 1 or 2, The balance switch 5 is turned on when the upper contact 19 and the movement transmission shaft 13 in a fixed position are raised together to be in contact with the upper contact 19, and the switch hold mechanism is turned off. Gas leakage blocking device, characterized in that consisting of a lower contact (18) is lowered together when the movement transmission shaft (13) in the state is lowered to come off the contact with the upper contact (19). 4. The switch holding mechanism according to claim 3, wherein the switch holding mechanism comprises a hold switch (3) which is turned on when the operation switch of the gas appliance is operated for the first time or when the operation switch is operated in the direction of increasing the gas consumption of the gas appliance. When the switch 3 is turned on, it is energized to hold the contact 18 and 19 of the balance switch 5 to pull each other by exerting the function of the electromagnet to hold the balance switch 5 on. Gas leakage blocking device, characterized in that consisting of a coil (8). The method of claim 1 or 2, wherein the pressure reducing part 12 controls the amount of gas flowing through the inlet port 21 by controlling the opening degree of the inlet port 21 in conjunction with the movement of the diaphragm (11). Gas leakage blocking device further comprises a gas inlet flow control valve (40). 6. The gas flow rate control valve (40) according to claim 5, wherein the gas inflow control valve (40) includes a valve body (41) for reducing or expanding the inlet port (21) by entering or retracting by having a tapered tip portion. The gas leakage blocking device, characterized in that consisting of an intermediate body 42, one end portion is connected to the ram (11) to advance or retract the valve body (41) in accordance with the movement of the diaphragm (11).