JP2016142473A - Gas type heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas type heater having two safety functions, i.e. prevention of no-water burning and prevention of increasing in temperature even if a liquid heater device is kept under no power supply.SOLUTION: Even if no-power supply state occurs, a float switch is operated under utilization of electromotive current of a thermocouple, a lack of amount of water in a liquid tank and a sloshing phenomenon are detected and a switch OFF signal can be set in respect to a solenoid valve for supplying gas, so that prevention of non-water burning and anti-sloshing countermeasure can be attained. Further, since this is a safety device in which a bi-metal thermo or liquid expansion type high-cut thermo is utilized together, when a temperature in the tank exceeds a predetermined threshold temperature and abnormally increases, the gas solenoid valve is closed to prevent the temperature from being increased more than that above and the gas passage is shut off. Since two-stage type or side-by-side arrangement double mechanism is applied, it is possible to improve safety characteristic.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas-type heating device that heats a liquid. More specifically, even when the device is in a no-power state, it detects whether the liquid tank is empty and abnormally heats up. The present invention relates to a gas-type heating device having two or more safety functions for preventing (overheating prevention).

  The purpose of the safety device of the gas heating equipment is to prevent gas leakage that automatically stops the gas when the flame goes out, to prevent electric leakage that automatically shuts off the electricity when it leaks due to a short circuit, etc. CO emission prevention that stops gas automatically, abnormal heating of the airframe and heated object, overheating prevention that automatically stops gas when the airframe falls, residual unburned gas, abnormal pressure, overcurrent, freezing in severe winter, etc. There is equipment damage prevention. As a device for preventing overheating, there are a heating prevention device, an air blow prevention device, and an air blow safety device, and there is also a safety device that automatically stops gas when it falls.

  The method used in the heat-prevention device is a bimetal that cuts off gas by sticking together two types of metal plates with significantly different coefficients of thermal expansion and turning on / off electrical contacts using mechanical deformation due to temperature changes. Generally, a switch, a temperature fuse that melts an alloy having a low melting temperature with an abnormal rise in ambient temperature, senses heat generated by the device due to overcurrent, and shuts off the gas. Further, the air blow prevention device uses a thermistor that keeps the temperature constant by increasing the resistance as the temperature rises, and shuts off the gas when an abnormally high temperature is detected. Patent Document 1 below shows an example in which a bimetal heating prevention sensor is attached to a cooking gas burner.

  As a typical example of a safety device against emptying, the water level (water level) in the liquid tank is detected by a water volume sensor provided in the liquid tank, and the gas valve is opened if the water level does not reach the set level. However, there is a float switch that controls the gas valve to close when it falls below a set value due to water shortage.

  Such a safety device is not only used during normal use but also when an earthquake occurs and the supply of electricity is interrupted, and the gas heating device is turned off. It is very important that this is done reliably.

JP-A-10-281457

  Conventionally, safety measures using a heat-preventing device using a extinguishing safety device and a bimetal (or liquid expansion) thermo were possible even when the gas equipment was turned off. That is, when a thermocouple (thermocouple) is attached to the burner, the thermoelectromotive force will continue to be generated unless the flame of the gas burner goes out, so even if the power supply to the gas equipment is interrupted, the bimetal to be connected This is because the power supply to the thermo can be secured. It is possible to switch the electrical contacts to the ON / OFF state according to the temperature by using a bimetal that is bonded to metal plates having different coefficients of thermal expansion and uses mechanical deformation due to a temperature change. For example, when the temperature rises too much, it is possible to prevent heating by setting it to OFF and shutting off the gas passage. On the other hand, when the gas burner goes off, the thermoelectromotive force in the thermocouple disappears and the solenoid valve for supplying gas is not energized. As a result, the gas supply is stopped without opening the safety valve, and the thermocouple goes off and functions as a safety device.

  In this way, even when the gas equipment is in a non-powered state, the combustion of the gas can generate a thermoelectromotive force in the thermocouple to prevent abnormal heating by the bimetal thermometer. If so, the flame will continue to burn, and gas ignition may continue unless the bimetal thermo detects an abnormal temperature rise. This becomes empty when the water level in the liquid tank is insufficient, which is extremely dangerous. In addition, if the liquid level in the liquid tank fluctuates abnormally (sloshing) due to the effect of shaking during an earthquake, the liquid may overflow from the liquid tank. It is necessary to stop the gas supply to extinguish the fire.

  The present invention has been made in view of the above problems, and even when the liquid heating apparatus is in a non-powered state, the gas-type heating having two or more safety functions combined with prevention of emptying and overheating is provided. It is intended to provide equipment.

  In order to solve the above-described problems, a gas heating apparatus provided with the safety device of the present invention includes a thermocouple that senses the extinction of a flame of a gas burner, and a thermocouple that is electrically connected in series to the thermocouple. A float switch for detecting whether the amount of liquid in the liquid tank exceeds a predetermined level and whether the liquid surface is abnormally vibrated, and the float switch is electrically connected in series, and the liquid in the liquid tank A bimetal thermometer that detects whether the temperature rises abnormally beyond a predetermined threshold temperature, and when the heating device is in a non-power supply state where no power is supplied during combustion, the electromotive force of the thermocouple is The float switch is supplied to the bimetal thermometer, and the float switch determines whether the amount of liquid in the liquid tank is below a predetermined level or whether the liquid level in the liquid tank is abnormally vibrating. If there is at least one, a control signal for closing the plug of the gas burner is output to prevent emptying, and the control signal for closing the plug of the gas burner is not output in the liquid tank by the bimetal thermo. When the liquid is detected to exceed a predetermined threshold temperature, the bimetal thermo outputs a control signal for closing the plug of the gas burner in order to prevent an abnormal temperature rise of the liquid, and the gas burner temporarily When closed, the gas burner is not automatically returned for re-ignition.

  In order to solve the above-described problems, a gas heating apparatus provided with the safety device of the present invention includes a thermocouple that senses the extinction of a flame of a gas burner, and a thermocouple that is electrically connected in series to the thermocouple. The float switch for detecting whether the amount of liquid in the liquid tank exceeds a predetermined level and whether the liquid level is abnormally oscillating, the thermocouple and the float switch are movable with no power source and are electrically independent And a liquid expansion type high-cut thermometer that detects whether the liquid in the liquid tank is in an abnormal temperature rise state exceeding a predetermined threshold temperature with no power supply, and is directly connected to the solenoid valve unit, and the combustion of the heating device In the case of no power supply during which no power is supplied, the electromotive force of the thermocouple is supplied to the float switch, and the float switch is configured so that the amount of liquid in the liquid tank is below a predetermined level. If there is at least one of the liquid level in the liquid tank or abnormally vibrating, a control signal for closing the plug of the gas burner is output in order to prevent emptying, and the float switch When the liquid swelling high-cut thermoelectrically independent from the liquid tank detects that the liquid in the liquid tank exceeds a predetermined threshold temperature, the liquid swelling high-cut thermo prevents abnormal temperature rise of the liquid. Therefore, a control signal for closing the plug of the gas burner is output, and once the gas burner is closed, automatic return for reignition of the gas burner is not performed.

  The safety device for a gas heating device according to claim 1 of the present invention is such that the thermocouple is electrically connected to the float switch in series, and therefore, even if the gas heating device is powered off, The electric current is transmitted to the float switch and further to the bimetal thermoelectrically joined in series. Since the contact point used for the float switch operates normally even if it is a weak current, it is possible to reliably detect the shortage of the liquid amount in the tank even if the power source is in a no-power state. For this reason, when the amount of liquid in the tank does not exceed the predetermined value, it is determined that the water level is insufficient, and control is performed so as not to ignite the gas.

  In addition, even if an ON signal indicating that the water level has been reached is output from the float switch due to malfunction or the like even though it has not reached the predetermined water level, the temperature inside the tank exceeds the predetermined threshold temperature due to the bimetal thermometer and is abnormal. When the temperature is increased, the gas solenoid valve is closed to block the gas passage so that the temperature is not further increased. When using a two-stage safety mechanism with no power supply, the float switch is used for safety during normal use, and the second-stage safety measures are taken using a bimetal thermometer for emergency use when an abnormal situation occurs. Can also be realized.

A safety device for a gas heating device according to claim 2 of the present invention is a liquid expansion type high-cut thermo that can be operated with no power supply as a component independent of the float switch, instead of the bimetal thermo of claim 1. use.
Therefore, even if either one of the float switch or the liquid expansion type high cut thermo fails, the remaining one closes the gas valve, so that a double safety device is constructed.
Of course, in addition to the bimetal thermo of claim 1, the liquid-expanded bimetal thermo of claim 2 may be further provided as a component to form a triple safety device.

  In addition, since the float switch according to claims 1 and 2 outputs a switch OFF signal even in the case of a sloshing phenomenon in which the liquid level in the tank is abnormally swung, an unexpected situation such as an earthquake has occurred. At that time, even if the gas supply company does not stop the gas supply or before it stops, the safety device itself of the gas heating device of the present invention can quickly close the gas plug and shut off the gas supply. It is effective as a safety device.

BRIEF DESCRIPTION OF THE DRAWINGS It is the gas type heating apparatus which is one Embodiment of this invention, and the block diagram and circuit diagram provided with the safety device using a bimetal thermo are shown. BRIEF DESCRIPTION OF THE DRAWINGS The block diagram and circuit diagram provided with the safety device which is a gas-type heating apparatus which is one Embodiment of this invention, and uses a liquid expansion type high cut thermostat are shown. It is a flowchart which shows the operation | movement procedure of the safety device which uses a bimetal thermo. It is a flowchart which shows the operation | movement procedure of the safety device which uses a liquid expansion type high cut thermo.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing the entire gas heating device of the present embodiment. The electrical configuration of the safety device is shown in the lower part of the figure.

  Reference numeral 6 in FIG. 1 denotes a liquid tank. Liquid such as water or oil is stored in the liquid tank (in the present embodiment, the liquid is assumed to be water unless otherwise specified, but may be oil, for example). The float switch 3 detects the water level in the tank. The float switch 3 includes a magnet in a floating body (for example, a ball float) that follows up and down the liquid level, and a magnetically operated reed switch enclosed in a glass tube. The reed switch is fixed at the liquid level to be detected, and the reed switch is turned ON / OFF by the vertical movement of the ball float according to the water level. When the reed switch is ON (the ball float moves up), a signal that the specified water level has been reached is output. On the other hand, if it is located below the liquid level detected by the ball float, the specified water level has not been reached and an OFF signal is output.

  When the water level in the tank is kept constant, the water valve connected to the ball float is opened and closed by utilizing the fact that the position of the ball float that floats on the water surface due to buoyancy moves according to the water level.

Below the liquid tank 6, gas combustion means (for example, a gas burner) 7 for heating water in the liquid tank is disposed. Reference numeral 9 denotes a spark rod (ignition rod) that discharges to working gas in the vicinity of the flame opening of the gas burner 7 to generate a spark and ignite it. Instead of the spark rod 9, a piezoelectric ignition method may be used. A gas is ignited by impacting the piezoelectric body with a hammer by the force of a spring and generating a spark spark with the generated high voltage. For example, when the dial type ignition handle 13 is turned to force the gas valve to open by human power, and at the same time, a spark is ejected from the piezoelectric element, gas flows to the gas burner 7 and ignites.
1 is an electromagnetic valve unit (solenoid valve), and 2 is a thermocouple (thermocouple). When the thermocouple 2 is warmed by the flame of the gas burner 7, the thermocouple 2 detects ignition. The heated thermocouple 2 generates a thermoelectromotive force, and if a weak thermal current is passed through the electromagnet in the electromagnetic valve unit 1 to be connected using this, an electromagnetic force is generated. This electromagnetic force functions as an action of opening the gas valve in the manner of an electromagnet, and gas is continuously supplied.

  When the flame of the gas burner 7 is extinguished, the thermocouple 2 is not heated, so the thermoelectromotive force is lost. Accordingly, the electromagnetic force in the electromagnetic valve unit 1 disappears, so that the gas valve opened by the electromagnet force returns to the position where the gas supply port is closed, and the gas passages of both the main burner and the pilot burner are blocked.

  4 is a bimetal thermo that shuts off gas and electricity when the temperature rises above a certain level and prevents the temperature from rising further. The bimetal thermo 4 automatically switches the ON / OFF of the switch depending on the temperature by sticking metal plates having different thermal expansion coefficients and utilizing the property that the bending method changes depending on the temperature change. Therefore, when the temperature becomes higher than the setting, the switch is turned off, and the device functions as an excessive rise prevention device that avoids heating until the temperature becomes abnormally high. If the liquid tank 6 is sealed, the internal pressure becomes high, which is dangerous. If the liquid in the liquid tank 6 is oil, the oil will ignite if it is continuously heated. It is.

  As described above, even if the gas heating device is turned off for some reason, the gas supply does not always stop immediately, and if the flame is burned, the thermocouple 2 closes the gas valve of the electromagnetic valve unit 1. Since no control signal is output, gas combustion continues. In this case, the water in the liquid tank 6 gradually evaporates, and the liquid tank 6 becomes empty unless water corresponding to the amount of evaporation is supplied. Certainly, if gas combustion continues in a state where water is not supplied and the water level is low, the temperature of the liquid tank 6 becomes high. Therefore, it can be expected to prevent the bimetal thermo 4 from being heated to an abnormally high temperature. That is, in the case of the conventional bimetal thermo method, the liquid tank 6 is ignited even when the water level is insufficient, and the gas is shut off after rising to a predetermined threshold temperature (a liquid expansion type high-cut thermo thermometer described later). The same applies to the method).

  However, until the control signal for closing the gas valve is output from the bimetal thermo 4, the ignition is continued due to insufficient water level, so that it is in an empty state or near an empty state. If this is repeated many times, the damage to the liquid tank 6 increases and thermal deformation occurs. For example, a liquid tank used in a high-efficiency device is only blown for about 10 seconds, so that the heat exchange portion is damaged, and deformation and stress cracking occur. Therefore, even if the bimetal thermo 4 is installed, it must be essentially avoided from being in an empty state. In other words, in order to protect the liquid tank, it is necessary to shut off the gas before ignition.

Therefore, the safety device for the gas heating device according to the present invention includes the thermocouple 2 and the bimetal thermo 4 (or the liquid expansion bimetal thermo 5), the float switch 3, and the solenoid valve unit 1, and the empty air is generated by the float switch 3. It has a double safety structure that prevents overheating and prevents overheating with the bimetal thermo 4 (liquid expansion bimetal 5). When the solenoid valve unit 1 receives an ON signal from the float switch 3, it determines that the water supply has reached the specified water level and opens the gas plug (heating starts), but the water level is insufficient and the float switch turns on. If no signal is output (the circuit remains open), the gas plug remains closed. For example, if the water level is insufficient, even if you try to force ignition manually (for example, piezoelectric spark), the thermocouple generates heat and generates electromotive force, but the float switch does not send an ON signal. The solenoid valve coil is not activated and the gas plug remains closed. Naturally, when the ignition switch is released, combustion cannot be maintained and combustion is impossible.
After ignition, the contact point used for the float switch 3 operates with a weak current, so it is sufficient if there is a thermoelectromotive force from the thermocouple 2, and if there is no power supply due to an earthquake during heating However, it is possible to reliably prevent airing. In this way, it is possible to provide a double safety device at a low cost with a simple configuration.
If an AC power source or a battery is used, if the water level is below the specified level even before ignition, an OFF signal is input to the control circuit, etc., and the control circuit is interlocked so that ignition cannot be performed. Development based on this structure is also possible, such as outputting an ON signal when the water level is reached and releasing the interlock.

  Although the float switch 3 can be operated with a minute current, the contact portion is made of a contact material such as gold, rhodium, or indium so that the contact operation is good and the contact failure due to rust is less likely to occur. It is preferable to prevent deterioration as much as possible by using a gas injected. In order to reduce the resistance value, the diameter of the relay wire may be increased.

  Further, at the time of an earthquake, the shaking of the ground is transmitted to the liquid tank 6, and the sloshing phenomenon that the liquid level in the tank swings abnormally is generated. A large sloshing will cause the liquid to overflow from the liquid tank 6, so that it is expected to ignite, particularly when the liquid is oil, which will be a very dangerous situation. Therefore, the float switch 3 of this embodiment outputs an OFF signal to the electromagnetic valve unit 1 even when it detects that the liquid level has been shaken and sloshing has occurred. As a result, when an unexpected situation such as an earthquake occurs, even if the gas supply company does not stop the gas supply, the safety device itself of the gas heating device of the present invention can quickly close the gas stopper. Safety measures can be taken.

  As described above, in the gas heating apparatus according to the present invention, even when there is no power supply, the float switch 3 can detect water level shortage and sloshing in the liquid tank 6 to prevent emptying, but the float switch 3 breaks down. It may not work properly. In spite of not reaching the predetermined water level, an ON signal is output, and ignition is started and combustion is continued. Furthermore, although it is not a malfunction of the float switch, if the liquid in the tank contains oil, the switch may be fixed to the ON contact due to the stickiness of the oil. In this case as well, an erroneous detection is made that a specified amount of water is stored in the liquid tank 6 even though there is actually no water, and an ignition state occurs and airing occurs.

Therefore, the bimetal thermo 4 as a second safety device functions. Even if the gas heating device is turned off, the bimetal thermo 4 can be operated by the electromotive current of the thermocouple 2 that is electrically connected in series. Therefore, the bimetal thermo 4 can detect an abnormal state in which the inside of the tank is heated to an abnormally high temperature and switch it to the switch OFF to prevent the gas-type heating device from excessively rising. Since the float switch 3 and the bimetal thermo 4 are connected in series, the gas valve is controlled to be closed when at least one switch is turned off.
Therefore, the safety device of the gas type heating device according to the present invention can realize the improvement of safety by the two-stage safety mechanism even in the non-powered state.

Next, a second embodiment shown in FIG. 2 will be described. In the first embodiment described above, the lack of the water level in the liquid tank 6 cannot be correctly detected due to a malfunction of the float switch 3, or it is not a malfunction of the float switch, but is stuck to the ON contact and gas combustion continues. It was the structure which avoids the situation where it becomes extremely high temperature by using the bimetal thermo 4. In the second embodiment, instead of the bimetal thermo 4, a liquid expansion type high-cut thermo 5 that is movable without a power source is used. Of course, in addition to the bimetal thermo 4, a liquid expansion type high cut thermo can be provided to form a triple safety device.
In the gas heating device according to the second embodiment, the gas valve is forcibly opened while the ignition button 10 is being pressed, and the spark is ignited by the spark rod 9 ignited by the voltage of the dry battery 14. It is structured.

  The liquid expansion type high-cut thermo 5 encloses a liquid having a high coefficient of thermal expansion in the heat sensitive part, and uses the liquid expansion in the heat sensitive tube (sensor) to open and close the electrical contact through a capillary tube (fine conduit) by a snap action. Is. The function of the liquid expansion type high-cut thermo 5 in the safety device of the gas heating device is the same as that of the bimetal shown in the first embodiment. However, as shown in the circuit diagram in the lower part of the figure, the liquid expansion is movable with no power supply. In the case of the type high cut thermo 5, the thermocouple 2 and the bimetal are electrically independent. That is, there is a difference in that there are two systems, a gas shut-off system via the float switch 3 and a gas shut-off system via the liquid expansion high-cut thermo 5, and the liquid expansion high-cut thermo is Operates without being influenced by the electromotive force because it is movable with no power source.

  By configuring the liquid expansion type high-cut thermo 5 independently, an independent gas shut-off path that is not interlocked with the float switch 3 is secured.

  Further, the reset button 12 of the reset switch unit 11 is connected to the liquid expansion type high cut thermo 5.

  When the bimetal thermo 4 or the liquid expansion type high cut thermo 5 which is an excessive rise prevention device is operated and the gas is shut off, there are two types of recovery, a manual reset and an automatic reset. Even if either the bimetal thermo 4 or the liquid expansion type high cut thermo 5 is used, or even when the liquid expansion type high cut thermo is added to the bimetal thermo 4, the automatic reset is not performed. In the case of the safety device using the bimetal shown in the first embodiment, the cock (instrument plug) of the electromagnetic valve unit 1 is manually returned to start again, and the liquid expansion type high-cut thermo 5 shown in the second embodiment is used. In the case of the safety device to be used, after the reset button 12 in the reset switch unit 11 is pushed, the cock is manually returned to operate again. Thus, a secondary disaster can be avoided by performing a recombustion after confirming the state by performing a manual reset.

The operation procedure of the safety device for the gas heating device is shown in the flowcharts of FIGS. FIG. 3 shows the procedure when the bimetal thermo is used.
It is assumed that the ignition is started and the power is turned off during normal combustion. A water level check by the float switch 3 is executed at predetermined time intervals (step S10). If the water level is lower than a preset water level (for example, 1/2 of the liquid tank 6), it is determined that the water supply is shut off or water supply is insufficient, and a float switch OFF signal is output, and the solenoid valve unit 1 closes the gas valve (step S12). , S15). In the normal state in which power is supplied, water supply is performed by a temperature / pressure valve when it is determined that water supply is required due to evaporation or the like. However, since there is no power supply, even if it is determined in step S10 that the water level is insufficient. The heating power adjustment of the gas burner 7 and the water supply adjustment into the liquid tank 6 are not performed.

  Next, the float switch 3 checks whether the liquid level is abnormally swung (step S11). When it is determined that there is sloshing, a float switch OFF signal is output (step S12), the solenoid valve unit 1 closes the gas valve (step S15), and extinguishes the gas burner 7 (step S12), as in the case of insufficient water supply. S16). When it is determined that there is no sloshing, it is further detected by the bimetal thermo 4 whether the water in the liquid tank 6 is heated to a higher temperature than the set value (step S13). The bimetal thermo 4 outputs a switch OFF signal when the temperature exceeds a preset temperature (step S14). In response, the solenoid valve unit 1 closes the gas valve and extinguishes the gas burner 7 (steps S15 and S16).

  If the temperature does not rise abnormally in step S13, the process returns to step S10 and the above-described procedure is repeated to perform a two-stage safety measure linked with the float switch 3 and the bimetal thermo 4.

  FIG. 4 shows the procedure when the liquid expansion type high cut thermo 5 is used. A water level check (step S20) by the float switch 3 and an abnormal temperature rise check (step S25) by the liquid expansion type high cut thermo 5 are executed in parallel at predetermined time intervals. If the water level is lower than the preset water level (for example, 1/2 of the liquid tank 6), it is determined that the water supply is shut off or the water supply is insufficient, and a float switch OFF signal is output (step S22). Close (step S23). If the set water level is satisfied, the float switch 3 further checks whether the liquid level is abnormally swung (step S21). When it is determined that there is sloshing, a funnel switch OFF signal is output, the solenoid valve unit 1 closes the gas valve (step S23), and extinguishes the gas burner 7 (step S24). If it is determined in step S21 that there is no sloshing, the process returns to step S20.

  On the other hand, when the liquid expansion type high-cut thermo 5 detects an abnormal temperature rise, a switch OFF signal is output (step S26). In response, the solenoid valve unit 1 closes the gas valve (step S27) and extinguishes the gas burner 7 (step S28). If no abnormal temperature rise is detected, the process returns to step S25.

  Even during ignition, ignition operation is possible only when the switch ON signal is output from the float switch 3 and the bimetal thermo 4 (or the liquid expansion type high cut thermo 5), and there is no ON signal or the OFF signal If so, it is controlled so that it cannot be ignited.

  The safety device shown in the first embodiment and the second embodiment can perform a safety measure for turning off, preventing airing, and preventing abnormal temperature rise even if the gas heating device is turned off. If the water level is insufficient, the gas can be shut off before ignition. After ignition, gas is shut off when the temperature in the liquid tank becomes abnormally high due to the bimetal thermostat, and safety can be improved by a double or more safety mechanism.

1 Solenoid valve unit 2 Thermocouple (thermocouple)
DESCRIPTION OF SYMBOLS 3 Float switch 4 Bimetal thermo 5 Liquid expansion type high cut thermo 6 Liquid tank 7 Gas burner 9 Spark rod 10 Ignition button 11 Reset switch unit 12 Reset button 13 Dial type ignition handle 14 Dry cell

Claims (2)

A gas heating device provided with a safety device, wherein the safety device is
With a thermocouple that senses the disappearance of a gas burner flame,
A float switch that is electrically connected in series with the thermocouple and detects whether the amount of liquid in the liquid tank exceeds a predetermined level and whether the liquid level is abnormally vibrated,
A bimetal thermo that is electrically connected in series with the float switch and detects whether the liquid in the liquid tank is in an abnormal temperature rise state exceeding a predetermined threshold temperature;
With
Even when the heating device is in a no-power state where power is not supplied during combustion, the electromotive force of the thermocouple is supplied to the float switch and the bimetal thermo,
The float switch is a plug of the gas burner to prevent emptying if there is at least one of the amount of liquid in the liquid tank being below a predetermined level or the liquid level in the liquid tank being abnormally vibrated. Output a control signal to close
When the control signal for closing the plug of the gas burner is not output, the bimetal thermo detects that the liquid in the liquid tank has exceeded a predetermined threshold temperature. Output a control signal to close the gas burner plug to prevent
The gas heating apparatus according to claim 1, wherein once the gas burner is closed, automatic return for reignition of the gas burner is not performed. A gas heating device provided with a safety device, wherein the safety device is
With a thermocouple that senses the disappearance of a gas burner flame,
A float switch that is electrically connected in series with the thermocouple and detects whether the amount of liquid in the liquid tank exceeds a predetermined level and whether the liquid level is abnormally vibrated,
Whether the thermocouple and the float switch are electrically independent, directly connected to the solenoid valve unit, and whether the liquid in the liquid tank is in an abnormal temperature rise state exceeding a predetermined threshold temperature without power supply Liquid swelling type high cut thermo to detect,
With
During the combustion of the heating device, when a non-power supply state where no power is supplied, the electromotive force of the thermocouple is supplied to the float switch,
The float switch is a plug of the gas burner to prevent emptying if there is at least one of the amount of liquid in the liquid tank being below a predetermined level or the liquid level in the liquid tank being abnormally vibrated. Output a control signal to close
When the liquid swelling high-cut thermo that is movable with no power supply and electrically independent of the float switch detects that the liquid in the liquid tank exceeds a predetermined threshold temperature, the liquid swelling high-cut thermo is Output a control signal to close the gas burner plug in order to prevent abnormal temperature rise of the liquid,
The gas heating apparatus according to claim 1, wherein once the gas burner is closed, automatic return for reignition of the gas burner is not performed.

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