JPH10300078A - Gas shut-off device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a forced extinguishment of a burner by a simple configuration. SOLUTION: During combustion at a burner, a coil 21a is electrically energized through a thermo-couple 10. In this case, as a pan bottom temperature is increased to cause a temperature of a thermo-sensitive ferrite to reach a Curie point, an oscillating plate is oscillated to cause a valve closing magnet 41 to approach near a magnet safety valve. Due to this fact, a magnetic field indicated by an arrow (b) is produced at each of an iron core 21b and an attracted piece 23 by magnetic force of a valve closing magnet 41, a magnetic force at one of contact surfaces between the iron core 21b and the attracted piece 23 is eliminated, the attracting force by an electro-magnet 21 is decreased lower than an energization force of a pressing spring and the attracted piece 23 is separated away from it, so that the burner is forcedly extinguished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shut-off device, and more particularly to a gas shut-off device having a magnet safety valve.

[0002]

2. Description of the Related Art Conventionally, a so-called magnet safety valve has been used for a gas-burning device such as a gas stove, a gas cooker, or a small water heater, in which a gas supply path is kept open by energizing a thermocouple as a safety device. Is provided.
The magnet safety valve is configured to be energized by a thermoelectromotive force generated by a thermocouple provided near the burner being heated by combustion heat, and to maintain an open state of the gas supply path with a magnetic force generated by the energization. When the burner is extinguished due to poor ignition or misfiring, the gas supply path is reliably closed to prevent the raw gas from continuing to flow.

[0003] It is also desired to not only prevent the raw gas from flowing out when the burner is extinguished, but also to forcibly extinguish the fire when an abnormality is detected or the timer is operated during the burner burning. There is known an apparatus equipped with a so-called tempura fire prevention sensor that shuts off the gas supply when the temperature exceeds a predetermined temperature and extinguishes the burner. As a configuration for forcibly shutting off the gas supply in this way, it is desirable to use the above-described magnet safety valve in order to prevent the structure from becoming complicated, and to cut off the current path from the thermocouple to the magnet safety valve. A method of closing the valve has been considered.

[0004]

However, the thermoelectromotive force generated by the thermocouple is very small, especially when the burner burn amount is the minimum, and even with such thermoelectromotive force, the magnetic force for holding the magnet safety valve open can be obtained. As described above, the circuit resistance of the closed circuit between the thermocouple and the exciting coil is configured to be very small at about 50 mΩ. Therefore, if a contact for interrupting the current path is provided in such a circuit, the influence of the contact resistance will be great, and the ignition performance and the throttling performance of the thermal power will deteriorate, and the reliability will increase due to the increase in the contact resistance due to aging. However, there was a problem such as a decrease. Therefore, in order to constitute such a forced fire extinguishing device for a burner, there is a problem that a controller and a dry battery are required because the generated thermoelectromotive force of the thermocouple cannot hold the magnet safety valve, thereby increasing costs. An object of the present invention is to solve the above problems and to forcibly extinguish a burner with a simple configuration.

[0005]

According to a first aspect of the present invention, there is provided a gas shut-off device, comprising: a thermoelectric generator for generating a thermoelectromotive force by being heated by combustion heat of a burner; A coil forming a closed circuit with a power generating element, a valve element provided in a fuel gas supply path to the burner, and constantly urged in a valve closing direction, and a coil generated by energizing the coil from the thermoelectric element. In a gas shut-off device comprising an electromagnet for holding the valve body in an open state against a biasing force in a valve closing direction by a magnetic force, the valve body is canceled by canceling a magnetic force generated by the electromagnet by a permanent magnet. The gist of the invention is to provide a forced fire extinguishing means for forcibly extinguishing the burner by closing the valve.

According to a second aspect of the present invention, there is provided a gas shut-off device according to the first aspect, wherein the permanent magnet is provided so as to be accessible to the electromagnet, and the forced fire extinguishing means is provided. The gist is to cancel the magnetic force generated by the electromagnet by bringing the permanent magnet close to the electromagnet.

According to a third aspect of the present invention, there is provided a gas shut-off device according to the first aspect, wherein the permanent magnet is provided at a position for canceling a magnetic force generated by the electromagnet. At a position, a shutter for reducing the influence of a magnetic field from the permanent magnet to the electromagnet is movably provided, and the forced fire extinguishing means cancels the magnetic force generated in the electromagnet by moving the shutter and removing it from the predetermined position. That is the gist.

In the gas shut-off device according to the first aspect of the present invention, the thermoelectric element is heated during combustion of the burner to generate a thermoelectromotive force, and the coil forms a closed circuit with the thermoelectric element. The magnetic force generated in the electromagnet when energized causes the valve element provided in the fuel gas supply path to the burner to be kept open against the urging force in the valve closing direction. With such a configuration, when the flame of the burner is extinguished due to a misfire or the like, the generated thermoelectromotive force of the thermoelectric generator decreases, the magnetic force generated by the electromagnet decreases, and the magnetic force for holding the valve open is reduced. When the pressure falls below the urging force, the valve body is closed and the gas is shut off. In addition, the permanent magnet cancels out the magnetic force generated by the electromagnet to reduce the valve holding force of the valve body, and lowers the urging force in the valve closing direction, thereby closing the valve body and forcibly extinguishing the burner. be able to. The expression of canceling the magnetic force is not limited to completely reducing the magnetic force to zero, but means weakening the magnetic force to such an extent that the valve-opening holding force of the valve body falls below the urging force in the valve closing direction.

In the gas shut-off device according to the second aspect of the present invention having the above-described structure, the permanent magnet is provided so as to be accessible to the electromagnet. Therefore, by bringing the permanent magnet close to the electromagnet, the magnetic force of the electromagnet cancels out the magnetic force generated by the electromagnet, reduces the valve holding force of the valve body, closes the valve body, and forcibly extinguishes the burner. it can.

In the gas interrupting device according to the third aspect of the present invention, the permanent magnet is provided at a position where the magnetic force generated by the electromagnet is canceled, and the influence of the magnetic field from the permanent magnet to the electromagnet is reduced at a predetermined position. The movable shutter is provided. Therefore, by moving the shutter and removing it from the predetermined position, the magnetic force generated by the electromagnet is canceled by the magnetic force of the permanent magnet, the valve holding force of the valve is reduced, the valve is closed, and the burner is forcibly forced. Can extinguish fire.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the gas shut-off device of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a gas shut-off device incorporated in a gas stove as one embodiment of the present invention. The gas shut-off device includes a thermocouple 10 that is arranged near a flame hole of a burner 1 and generates a thermoelectromotive force when heated, a magnet safety valve 20 incorporated in an aluminum blinker main body 2, And a temperature sensor 30 projecting upward through the center.

The magnet safety valve 20 constitutes an extinguishing safety device that shuts off gas supply when the extinguishment occurs during the combustion of the burner 1. As shown in FIG. 2, a coil is mounted on a U-shaped iron core 21b. Electromagnet 2 wound with 21a
1, a resin case 22 for housing the electromagnet 21, a suction piece 23 slidably provided in the case 22, and a valve 25 fixed to the suction piece 23 by a penetrating shaft 24 penetrating the case 22. , And a pressing spring 26 that urges the valve body 25 in the valve closing direction.

The coil 21a forms a closed circuit with the thermocouple 10. When the burner 1 burns, the coil 21a
, A magnetic force is generated in the iron core 21b.

When the burner 1 is not burning, the valve body 25 is pressed by the pressing spring 26 to a position where the gas flow path to the burner 1 is closed. Here, when the ignition operation is performed by the push operation of the ignition button 3, the valve body 25 is pushed by the spindle 4 that slides in conjunction with the ignition button 3 to a position where the suction piece 23 comes into contact with the iron core 21 b, thereby forcibly. The valve is opened. Therefore, gas is supplied to the burner 1, and at the same time, the burner 1 is ignited to start combustion. When the thermocouple 10 is heated by the combustion heat of the burner 1 to generate a thermoelectromotive force, the thermocouple 10 is energized to the coil 21a and
A magnetic force is generated in 1b, and the attraction piece 23 is attracted and held in a state of contact with the iron core 21b. Thereafter, when the hand is released from the ignition button 3, the spindle 4 returns to a state where the valve body 25 can be closed.
Is held by suction and the valve body 25 is kept in the valve-open state, so that combustion continues. Here, when the disappearance occurs,
Due to the decrease in the thermoelectromotive force of the thermocouple 10, the power supply to the coil 21a decreases, and the magnetic force generated by the iron core 21b decreases.
The suction force by b is smaller than the urging force of the spring 26, the suction piece 23 is detached, the valve body 25 is pressed to the valve closing position, and the gas flow path to the burner 1 is shut off. Therefore, it is possible to prevent the raw gas from continuing to flow after the occurrence of the disappearance.

The temperature sensor 30 constitutes a tempura fire prevention device for forcibly extinguishing the burner 1 when the temperature at the bottom of the pot reaches a predetermined temperature. As shown in FIG. Cylindrical pillar 31 erected on
An outer case is formed by a cylindrical holder 32 provided to be able to slide up and down at the upper part of the column 31, and a heat-sensitive cap 33 fixed on the upper surface of the holder 32 and abutting on the bottom of the pan when the pan is placed. Inside the heat-sensitive cap 33, the temperature-sensitive ferrite 3 which changes from a ferromagnetic material to a paramagnetic material when it reaches the Curie point (250 ° C. in this embodiment) is reached.
4 are provided. Further, inside the holder 32, a cylindrical yoke 36 holding an attracting magnet 35 for attracting to the temperature-sensitive ferrite 34 at an upper end, and an operating shaft 37 connected to a lower portion of the yoke 36 are provided. A swing plate 4 that swings in conjunction with the vertical movement of the operating shaft 37 is provided below the operating shaft 37.
0 is provided, and a valve closing magnet 41 which is a permanent magnet for forcibly closing the magnet safety valve 20 is fixedly provided at the other end of the swing plate 40. The operating shaft 37 is the lower flange 3
When the temperature of the temperature-sensitive ferrite 34 is a ferromagnetic material before reaching the Curie point, the attracting magnet 35 is attracted and activated by a return spring 39 provided between the stationary plate 8 and the fixed plate 5. The shaft 37 is at the upper limit position together with the yoke 36 against the urging of the return spring 39. When the temperature of the temperature-sensitive ferrite 34 reaches the Curie point and becomes a paramagnetic material, the urging force of the return spring 39 exceeds. As a result, the attracting magnet 35 separates from the temperature-sensitive ferrite 34, and the operating shaft 37 drops together with the yoke 36. In conjunction with the drop of the operating shaft 37, the swing plate 40
Swings, causing the valve closing magnet 41 to approach the vicinity of the magnet safety valve 20.

Next, the valve closing operation of the magnet safety valve 20 by the valve closing magnet 41 will be described. As shown in FIG. 4, during the combustion of the burner 1, electricity is supplied to the coil 21a from the thermocouple 10, and a magnetic field as indicated by an arrow a is generated in the iron core 21b and the adsorption piece 23. Here, when the pot bottom temperature rises and the temperature of the temperature-sensitive ferrite 34 reaches the Curie point, the swing plate 40 swings by the above-described operation, and the valve closing magnet 41 approaches the vicinity of the magnet safety valve 20. Therefore Figure 5
As shown in FIG.
A magnetic field as shown by an arrow b is generated in the suction piece 23 and the iron core 2
The magnetic force of one of the contact surfaces of the contact piece 1b and the suction piece 23 is canceled out, and the suction force of the iron core 21b is suppressed, and the suction piece 23 is separated below the urging force of the spring 26, so that the valve body 25 is pressed to the valve closing position. As a result, the gas flow path to the burner 1 is shut off and the fire is forcibly extinguished.

As described above, according to the gas shut-off device of this embodiment, the valve closing magnet 41 is brought close to the iron core 21b, and the magnetic force generated by the iron core 21b is canceled by the magnetic force generated by the valve closing magnet 41. With this configuration, it is not necessary to provide a contact in a closed circuit formed by the thermocouple 10 and the coil 21a, so that the burner 1 can be forcibly extinguished by closing the valve body 25 without increasing electrical resistance.

The position of the valve-closing magnet 41 approaching the iron core 21b may be any position at which the effect of detaching the attraction piece 23 can be obtained. For example, it may be near the attraction piece 23 as shown in FIG. . In order to reduce the magnetic flux leakage due to the valve closing magnet 41, the shape of the iron core may be H-shaped as shown in FIG. 7, and the shape of the valve closing magnet may be U-shaped as shown in FIG. It may be. Further, as shown in FIG. 9, a plurality of valve closing magnets may be used. In this embodiment, the position of the valve closing magnet 41 is changed. However, the present invention is not limited to this. For example, as shown in FIG. A body shutter 50 may be provided, and the magnetic force generated by the iron core 21b may be canceled by moving the shutter 50. Further, the configuration may be such that the direction of the magnetic field is changed by reversing the valve closing magnet 41.

The embodiments of the present invention have been described above.
The present invention is not limited to these embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. For example, the present invention is not limited to a gas shut-off device for a gas stove, but may be applied to any gas-fired device provided with a magnet safety valve that keeps the valve open by energization from a thermocouple. Further, in the present embodiment, the configuration has been described in which the burner is extinguished based on the detected temperature.However, by automatically extinguishing the fire in conjunction with a timer or a vibration sensor, a timer extinguishing device or an earthquake extinguishing device may be configured, An automatic fire extinguisher that extinguishes fire at a desired timing can be arbitrarily configured.

[0020]

As described in detail above, claim 1 of the present invention
According to the gas shut-off device described above, the burner is closed by closing the valve body without increasing the resistance of the closed circuit formed by the thermoelectric generator and the coil by a simple configuration in which the magnetic force generated by the electromagnet is canceled by the permanent magnet. Fire can be forcibly extinguished. Further, since the permanent magnet uses magnetic force, there is no need to use a dry cell or a controller for the fire extinguishing operation.

Further, according to the gas shut-off device of the second aspect of the present invention, the burner can be forcibly extinguished by a simple structure such as bringing the permanent magnet close to the electromagnet.

Further, according to the gas shut-off device of the third aspect of the present invention, it is possible to forcibly extinguish the burner by a simple structure in which the shutter is moved and removed from a predetermined position.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a gas shut-off device incorporated in a gas stove as one embodiment.

FIG. 2 is a schematic configuration diagram of a magnet safety valve.

FIG. 3 is a schematic configuration diagram of a temperature sensor.

FIG. 4 is an explanatory diagram showing a relationship between a thermocouple and an electromagnet.

FIG. 5 is an explanatory diagram showing a valve closing operation by a valve closing magnet.

FIG. 6 is an explanatory view of an electromagnet and a valve closing magnet as another example.

FIG. 7 is an explanatory diagram of an electromagnet and a valve closing magnet as another example.

FIG. 8 is an explanatory diagram of an electromagnet and a valve closing magnet as another example.

FIG. 9 is an explanatory diagram of an electromagnet and a valve closing magnet as another example.

FIG. 10 is an explanatory view of an electromagnet and a valve closing magnet as another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Burner, 10 ... Thermocouple, 20 ... Magnet safety valve, 21 ... Electromagnet, 21a ... Coil, 23 ... Attraction piece, 25 ... Valve element, 30 ... Temperature sensor, 37 ... Operating shaft, 40 ... Rocking plate, 41 ... Valve closing magnet.

Claims (3)

[Claims] 1. A thermoelectric generator that generates a thermoelectromotive force by being heated by combustion heat of a burner, a coil that forms a closed circuit with the thermoelectric generator, and a fuel gas supply path to the burner. The valve body is biased in the normally closed direction, and the magnetic force generated by energizing the coil from the thermoelectric generator holds the valve body in the open state against the biasing force in the valve closing direction. A gas shut-off device provided with an electromagnet that performs a forced fire extinguishing means for canceling a magnetic force generated by the electromagnet with a permanent magnet to close the valve body and forcibly extinguish the burner. Gas shut-off device. 2. The apparatus according to claim 1, wherein the permanent magnet is provided so as to be accessible to the electromagnet, and the forced extinguishing means cancels the magnetic force generated by the electromagnet by bringing the permanent magnet close to the electromagnet. The gas shut-off device according to claim 1. 3. The forced fire extinguishing method, wherein the permanent magnet is provided at a position where the magnetic force generated by the electromagnet is canceled, and a shutter for reducing the influence of a magnetic field from the permanent magnet to the electromagnet is provided at a predetermined position. 2. The gas shut-off device according to claim 1, wherein the means cancels a magnetic force generated in the electromagnet by moving the shutter and removing the shutter from the predetermined position.