CN116951480A - Flameout protection circuit of gas appliance and gas appliance - Google Patents

Abstract

The invention discloses a flameout protection circuit of a gas appliance and the gas appliance, which comprise a current detection module, a control module, a driving module and a switching module, wherein the current detection module is used for detecting whether a working current exists in a hot-face igniter or not and sending a detection result to the control module, the control module sends a valve closing signal to the driving module when the detection result is that the working current does not exist, the driving module responds to the valve closing signal to drive the switching module to be disconnected, an electromagnetic valve is closed, the gas input to a burner is stopped, the gas leakage is avoided, the flameout protection function is realized, the problem that the protection function is invalid or the gas appliance is unstable in use due to the adoption of a flame induction needle is avoided, and the use safety and stability of the gas appliance are improved.

Description

Flameout protection circuit of gas appliance and gas appliance

Technical Field

The invention relates to the field of gas appliances, in particular to a flameout protection circuit of a gas appliance and the gas appliance.

Background

The gas appliance is an appliance which is used by people in daily life and adopts natural gas, liquefied gas and the like as fuel, such as a gas water heater, a gas stove, a gas oven and the like.

When the gas appliance works, heat is generated by burning fuel and is used for heating. In order to ensure safety in use, flameout protection devices, such as flame sensing needles, are often installed in existing general household gas appliances, which are typically located near the central combustion zone. In the working process of the gas appliance, if the flame sensing needle cannot sense flame, the controller is informed to close the electromagnetic valve, so that gas leakage is avoided. However, in the case of commercial appliances, the power is high and the service time is long, so that the temperature of the central combustion zone is very high, and the flame sensing needle is easily burnt out, so that the flame sensing needle loses the flameout protection function. Meanwhile, as the central combustion area is a negative oxygen area, combustion flame tends to be unstable, so that the induction information of the induction needle is inaccurate, and further, the flameout protection device is caused to malfunction to influence the normal use of the kitchen range, and the use process is unstable.

Disclosure of Invention

One of the technical problems to be solved by the invention is to provide a flameout protection circuit of a gas appliance, which can provide flameout protection function for the gas appliance and improve the use safety and stability of the gas appliance.

The second technical problem to be solved by the invention is to provide a gas appliance which has the flameout protection function and is safe and stable to use.

The first technical problem is solved by the following technical scheme:

a flameout protection circuit of a gas appliance comprises a current detection module, a control module, a driving module and a switch module;

the current detection module is respectively connected with a hot-face igniter of the gas appliance and the control module, and is used for detecting whether working current exists in the hot-face igniter or not and sending a detection result to the control module;

the control module is connected with the driving module, and the driving module is connected with the control end of the switch module;

the first end of the electromagnetic valve of the gas appliance is connected with a power supply, the second end of the electromagnetic valve is connected with the first end of the switch module, and the second end of the switch module is grounded;

and when the detection result shows that no working current exists, the control module sends a valve closing signal to the driving module, the driving module responds to the valve closing signal to drive the switch module to be disconnected, and the electromagnetic valve is closed to stop inputting fuel gas to the combustor.

The invention provides a flameout protection circuit of a gas appliance, which comprises a current detection module, a control module, a driving module and a switching module, wherein the current detection module is respectively connected with a hot-face igniter and the control module of the gas appliance and is used for detecting whether the hot-face igniter has working current or not and sending a detection result to the control module, the control module is connected with the driving module, the driving module is connected with a control end of the switching module, a first end of an electromagnetic valve of the gas appliance is connected with a power supply, a second end of the electromagnetic valve is connected with a first end of the switching module, the second end of the switching module is grounded, the control module sends a valve closing signal to the driving module when the detection result shows that the working current does not exist, the driving module responds to the valve closing signal to drive the switching module to be disconnected, the electromagnetic valve is closed, and gas is stopped from being input to a burner. According to the invention, the working current of the hot-face igniter is detected by the current detection module, when the working current does not exist in the hot-face igniter, the flameout of the gas appliance is indicated, the control module sends the valve closing signal to the driving module, the driving module responds to the valve closing signal to drive the switching module to be disconnected, the electromagnetic valve is closed, the gas input to the burner is stopped, the gas leakage is avoided, the flameout protection function is realized, the problem that the protection function is invalid or the gas appliance is unstable in use due to the adoption of the flame induction needle is avoided, and the use safety and stability of the gas appliance are improved.

In one embodiment, the current detection module comprises a current transformer, a rectifying unit, a voltage stabilizing and filtering unit and a voltage dividing unit;

the input end of the current transformer is connected in a power supply loop of the hot-face igniter, and the output end of the current transformer is connected with the input end of the rectifying unit;

the output end of the rectifying unit is connected with the input end of the voltage stabilizing and filtering unit;

the output end of the voltage stabilizing filter unit is respectively connected with the first end of the voltage dividing unit and the control module;

the second end of the voltage dividing unit is grounded.

In one embodiment, the control module comprises a first control chip and a second control chip, the first control chip and the second control chip are in communication connection, the driving module comprises a first driving unit and a second driving unit, and the switching module comprises a first switching unit and a second switching unit;

the current detection module is respectively connected with the first control chip and the second control chip;

the first control chip is connected with the first driving unit, and the second control chip is connected with the second driving unit;

The first end of the first switch unit is connected with the second end of the electromagnetic valve, the second end of the first switch unit is connected with the first end of the second switch unit, and the second end of the second switch unit is grounded;

the control end of the first switch unit is connected with the first driving unit, and the control end of the second switch unit is connected with the second driving unit;

when the detection result shows that working current exists, the first control chip sends a first valve opening signal to the first driving unit, the first driving unit responds to the first valve opening signal to drive the first switching unit to be conducted, and the first control chip sends a first feedback signal to the second control chip after sending the first valve opening signal;

and the second control chip sends a second valve opening signal to the second driving unit after the detection result shows that working current exists and the first feedback signal is received, the second driving unit responds to the second valve opening signal to drive the second switching unit to be conducted, and the electromagnetic valve is opened.

In one embodiment, the first switching unit includes a first electronic switching tube, and the second switching unit includes a second electronic switching tube;

The first end of the first electronic switching tube is connected with the second end of the electromagnetic valve, the second end of the first electronic switching tube is connected with the first end of the second electronic switching tube, and the second end of the second electronic switching tube is grounded;

the control end of the first electronic switching tube is connected with the first driving unit, and the control end of the second electronic switching tube is connected with the second driving unit.

In one embodiment, the first valve opening signal is a pulse signal, and the first driving unit includes an inverter subunit, a rectifier subunit, a voltage stabilizing filter subunit and a voltage dividing subunit;

the first end of the inversion subunit is connected with a power supply, the second end of the inversion subunit is grounded, the input end of the inversion subunit is connected with the first control chip and is used for receiving a first valve opening signal output by the first control chip, the output end of the inversion subunit is connected with the input end of the rectifier subunit, and the inversion subunit is used for converting direct current of the power supply into alternating current under the control of the first valve opening signal;

the output end of the rectifying subunit is connected with the input end of the voltage stabilizing filtering subunit;

The output end of the voltage stabilizing filter subunit is respectively connected with the control end of the first switch unit and the first end of the voltage dividing subunit;

the second end of the voltage dividing subunit is grounded.

In one embodiment, the inverting subunit includes a first resistor, a third electronic switching tube, and a first capacitor;

the first end of the first resistor is connected with a power supply, and the second end of the first resistor is connected with the first end of the third electronic switch tube;

the second end of the third electronic switching tube is grounded, and the control end of the third electronic switching tube is connected with the first control chip and is used for receiving the first valve opening signal or the first valve closing signal;

the first end of the first capacitor is connected with the first end of the third electronic switch tube, and the second end of the first capacitor is connected with the input end of the rectifier subunit.

In one embodiment, the rectifying sub-unit comprises a first unidirectional diode and a second unidirectional diode;

the anode of the first unidirectional diode is connected with the output end of the inversion subunit, and the cathode of the first unidirectional diode is connected with the input end of the voltage stabilizing and filtering subunit;

And the anode of the second unidirectional diode is grounded, and the cathode of the second unidirectional diode is connected with the output end of the inverter subunit.

In one embodiment, the voltage stabilizing filter subunit comprises a second capacitor and a second resistor, and the voltage dividing subunit comprises a third resistor;

the first end of the second capacitor is connected with the output end of the rectifying subunit, and the second end of the second capacitor is grounded;

the first end of the second resistor is connected with the first end of the second capacitor, and the second end of the second resistor is connected with the control end of the first switch unit;

the first end of the third resistor is connected with the control end of the first switch unit, and the second end of the third resistor is grounded.

In one embodiment, the flameout protection circuit of the gas appliance further comprises a conduction detection module, wherein the input end of the conduction detection module is connected to the first end of the switch module, the output end of the conduction detection module is connected with the control module, and the conduction detection module is used for detecting whether the switch module is conducted or not;

before the control module sends a valve opening signal to the driving module, if the control module receives a conduction signal fed back by the conduction detection module, the control module controls the gas appliance to be shut down.

The second technical problem is solved by the following technical scheme:

the gas appliance comprises an electromagnetic valve, a hot-surface igniter, a burner and a flameout protection circuit of the gas appliance, wherein the flameout protection circuit is provided by any embodiment of the invention;

the electromagnetic valve is connected with the burner through a pipeline;

the hot-face igniter is connected with a power supply and is arranged at the air outlet of the combustor.

The invention provides a gas appliance, which comprises an electromagnetic valve, a hot-surface igniter, a burner and a gas appliance flameout protection circuit, wherein the electromagnetic valve is connected with the burner through a pipeline, the hot-surface igniter is connected with a power supply, and the hot-surface igniter is arranged at an air outlet of the burner. In the flameout protection circuit of the combustion appliance, the current detection module detects the working current of the hot-face igniter, when the working current does not exist in the hot-face igniter, the flameout of the combustion appliance is indicated, the control module sends a valve closing signal to the driving module, the driving module responds to the valve closing signal to drive the switching module to be disconnected, the electromagnetic valve is closed, the input of the fuel gas to the combustion appliance is stopped, the fuel gas leakage is avoided, the flameout protection function is realized, the problem that the protection function is invalid or the combustion appliance is unstable due to the adoption of the flame induction needle is avoided, the use safety is good, and the use stability is good.

In one embodiment, the electromagnetic valve is a three-way electromagnetic valve and comprises an air inlet valve, a first air outlet valve and a second air outlet valve, and the gas appliance comprises a first burner, a second burner, a first hot-face igniter and a second hot-face igniter;

the air inlet valve is connected with the main fuel gas pipeline through a pipeline, the first air outlet valve is connected with the first burner through a pipeline, and the second air outlet valve is connected with the second burner through a pipeline;

the first hot-surface igniter is arranged at the air outlet of the first burner, and the second hot-surface igniter is arranged at the air outlet of the second burner;

the gas appliance comprises two gas appliance flameout protection circuits which are respectively used for controlling the first gas outlet valve and the second gas outlet valve.

Drawings

The invention is described in further detail below with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a flameout protection circuit for a gas appliance according to the present invention;

fig. 2 is a circuit diagram of a current detection module according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a flameout protection circuit of a gas appliance according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a first control chip according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a second control chip according to an embodiment of the present invention;

fig. 6 is a circuit diagram of a driving module and a switching module according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a combustion apparatus according to an embodiment of the present invention.

Description of the reference numerals:

110. a current detection module; 120. a control module; 130. a driving module; 140. a switch module; 111. a current transformer; 112. a rectifying unit; 113. a voltage stabilizing and filtering unit; 114. a voltage dividing unit; 131. a first driving unit; 132. a second driving unit; 141. a first switching unit; 142. a second switching unit; 1311. an inverter subunit; 1312. a commutator unit; 1313. a voltage stabilizing filtering subunit; 1314. a voltage dividing subunit; 150. a conduction detection module; 10. a three-way electromagnetic valve; 21. a first burner; 22. a second burner; 31. a first hot-side igniter; 32. a second hot-side igniter; 40. a power control board; 50. a combustion chamber; 60. a pressure stabilizing valve; 70. a touch control panel; 81. a temperature sensor; 82. a cross flow fan; 83. a kick temperature controller; 84. an external power source; 91. a rear heating tube; 92. a rear fan; 93. an indicator light; 94. and a gate switch.

Detailed Description

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.

The invention provides a flameout protection circuit of a gas appliance, which comprises a current detection module, a control module, a driving module and a switch module;

the current detection module is respectively connected with a hot-face igniter of the gas appliance and the control module, and is used for detecting whether the hot-face igniter has working current or not and sending a detection result to the control module;

the control module is connected with the driving module, and the driving module is connected with the control end of the switch module;

the first end of the electromagnetic valve of the gas appliance is connected with a power supply, the second end of the electromagnetic valve is connected with the first end of the switch module, and the second end of the switch module is grounded;

and when the detection result shows that the working current does not exist, the control module sends a valve closing signal to the driving module, the driving module responds to the valve closing signal to drive the switching module to be disconnected, the electromagnetic valve is closed, and the input of fuel gas to the burner is stopped.

The current detection module may be connected to a loop where the hot-face igniter is located, and may detect whether the hot-face igniter has an operating current in a current sampling manner or an induction manner.

A hot-face igniter is an ignition device that includes a semi-conductive ceramic body having terminals to which a high-voltage alternating current is applied, the current flowing through the ceramic body causing the body to heat and warm up, thereby providing an ignition source for the combustion gas to ignite the combustion gas. In the normal working process, the hot-face igniter always has working current.

The electromagnetic valve is an electrically controlled valve, the air inlet end of the electromagnetic valve is connected with the main fuel gas pipeline through a pipeline, and the air outlet end of the electromagnetic valve is connected with the burner through a pipeline.

The burner is a device for spraying and mixing combustion of fuel gas and air in a certain mode, and a hot-face igniter is usually arranged at an air outlet of the burner.

When the gas appliance works, the hot-face igniter works, the current detection module detects working current and feeds the detection result back to the control module, the control module sends a valve opening signal to the driving module, and the driving module responds to the valve opening signal to drive the switching module to be conducted, so that the electromagnetic valve is opened, and gas and air enter the combustor and are ignited by the hot-face igniter. When the circuit where the hot-face igniter is located has an open-circuit fault, at the moment, no current is arranged on the hot-face igniter, the temperature of the hot-face igniter is insufficient to ignite fuel gas, the current detection module cannot detect working current and feeds the detection result back to the control module, the control module sends a valve closing signal to the driving module, the driving module responds to the valve closing signal to drive the switching module to open, the electromagnetic valve is closed, fuel gas is stopped being input into the combustor, and fuel gas leakage is avoided.

It should be noted that, the gas appliance in the embodiment of the present invention may be a gas water heater, a gas stove, a gas oven, etc., and the embodiment of the present invention is not limited herein.

The invention provides a flameout protection circuit of a gas appliance, which comprises a current detection module, a control module, a driving module and a switching module, wherein the current detection module is respectively connected with a hot-face igniter and the control module of the gas appliance and is used for detecting whether the hot-face igniter has working current or not and sending a detection result to the control module, the control module is connected with the driving module, the driving module is connected with a control end of the switching module, a first end of an electromagnetic valve of the gas appliance is connected with a power supply, a second end of the electromagnetic valve is connected with a first end of the switching module, the second end of the switching module is grounded, the control module sends a valve closing signal to the driving module when the detection result shows that the working current does not exist, the driving module responds to the valve closing signal to drive the switching module to be disconnected, the electromagnetic valve is closed, and gas is stopped from being input to a burner. According to the invention, the working current of the hot-face igniter is detected by the current detection module, when the working current does not exist in the hot-face igniter, the flameout of the gas appliance is indicated, the control module sends the valve closing signal to the driving module, the driving module responds to the valve closing signal to drive the switching module to be disconnected, the electromagnetic valve is closed, the gas input to the burner is stopped, the gas leakage is avoided, the flameout protection function is realized, the problem that the protection function is invalid or the gas appliance is unstable in use due to the adoption of the flame induction needle is avoided, and the use safety and stability of the gas appliance are improved.

The flameout protection circuit for a gas appliance according to the present invention will be described by way of example with reference to the following embodiments, which are illustrative, not restrictive, of the present invention.

Fig. 1 is a schematic structural diagram of a flameout protection circuit for a gas appliance, which is provided by the present invention, as shown in fig. 1, and includes a current detection module 110, a control module 120, a driving module 130, and a switch module 140.

The current detection module 110 is respectively connected with a hot-face igniter of the gas appliance and the control module 120, and is used for detecting whether the hot-face igniter has working current or not and sending a detection result to the control module. The detection result may be fed back to the control module 120 in the form of a level signal, for example, a high level signal is fed back to the control module 120 when the hot side igniter has an operating current, and a low level signal is fed back to the control module 120 when the hot side igniter has no operating current. The current detection module 110 may be connected to a loop where the hot-face igniter is located, and may detect whether the hot-face igniter has an operating current in a current sampling manner or an induction manner.

The control module 120 is connected to the driving module 130, and the driving module 130 is connected to the control end of the switching module 140. The driving module 130 is used for driving and controlling the on-off of the switch module 140 under the control of the control module 120.

The first end of the solenoid valve of the gas appliance is connected to the power supply VCC, the second end of the solenoid valve is connected to the first end of the switch module 140, and the second end of the switch module 140 is grounded. The power source VCC may be an external power source, or may be a power source output by a power source module inside the gas appliance, which is not limited herein.

Under normal conditions, when the gas appliance is started, the hot-face igniter obtains working current. The current detection module 110 detects the operating current and feeds back the detection result to the control module 120. The control module 120 sends a valve opening signal to the drive module 130. Illustratively, in an embodiment of the present invention, in order to preheat the hot side igniter to a temperature sufficient to ignite the gas, the control module 120 sends a valve opening signal to the drive module 130 after a delay of a period of time (e.g., 7 seconds). The driving module 130 sends a turn-on control signal to the control end of the switch module 140 in response to the valve opening signal, and drives the switch module 140 to be turned on, so that a loop where the electromagnetic valve is located is turned on, the electromagnetic valve is opened, and fuel gas and air enter the burner and are ignited by the hot-face igniter.

When the circuit where the hot-face igniter is located has an open-circuit fault in the working process of the gas appliance, at the moment, no current is applied to the hot-face igniter, the temperature of the hot-face igniter is insufficient for igniting the gas, the current detection module 110 cannot detect the working current, and the detection result is fed back to the control module 120. The control module 120 sends a valve closing signal to the drive module 130. The driving module 130 responds to the valve closing signal to send a disconnection control signal to the control end of the switch module 140, the switch module 140 is driven to be disconnected, the loop where the electromagnetic valve is located is disconnected, the electromagnetic valve is closed, the input of fuel gas to the burner is stopped, the fuel gas is prevented from leaking, and flameout protection is achieved.

Fig. 2 is a circuit diagram of a current detection module according to an embodiment of the present invention, where, as shown in fig. 2, the current detection module includes a current transformer 111, a rectifying unit 112, a voltage stabilizing filtering unit 113, and a voltage dividing unit 114.

The input end of the current transformer 111 is connected in a power supply loop of the hot-face igniter, and the output end of the current transformer 111 is connected with the input end of the rectifying unit 112. The current transformer 111 is composed of a closed core and windings. The primary winding has few turns, and is connected in series in the power supply loop of the hot-face igniter, and the secondary winding has more turns and is connected with the input end of the rectifying unit 112. The current transformer 111 collects high-voltage ac in the power supply loop of the hot-face igniter and converts it into low-voltage ac.

An output terminal of the rectifying unit 112 is connected to an input terminal of the voltage stabilizing and filtering unit 113. The rectifying unit 112 rectifies the low-voltage alternating current to convert it into direct current.

The output end of the voltage stabilizing filter unit 113 is respectively connected with the first end of the voltage dividing unit 114 and the control module 120, and the second end of the voltage dividing unit 114 is grounded. The voltage stabilizing and filtering unit 113 is used for stabilizing and filtering the direct current output by the rectifying unit 112, so as to improve the accuracy of the detection result fed back by the current detection module. The voltage dividing unit 114 is used for dividing voltage, so as to avoid damage to the control module caused by overhigh voltage of the electric signal of the detection result fed back by the current detection module.

In some embodiments of the present invention, as shown in fig. 2, the rectifying unit 112 includes a rectifying chip DB, and a rectifying circuit is integrated in the rectifying chip DB, and the rectifying circuit may be a half-bridge rectifying circuit or a full-bridge rectifying circuit.

In some embodiments of the present invention, as shown in fig. 2, the voltage stabilizing filter unit 113 includes capacitors C1 and C2 and a resistor R1, wherein first ends of the capacitors C1 and C2 are connected to an positive output terminal of the rectifying chip DB, a negative output terminal of the rectifying chip DB is grounded, and second ends of the capacitors C1 and C2 are grounded. The first end of the resistor R1 is connected with the first ends of the capacitors C1 and C2, and the second end of the resistor R1 is used for outputting a detection result.

In some embodiments of the present invention, the voltage dividing unit 114 includes a voltage dividing resistor R2, a first end of the voltage dividing resistor R2 is connected to a second end of the resistor R1, and a second end of the voltage dividing resistor R2 is grounded.

In some embodiments of the present invention, the current detection module further includes a current limiting resistor R3, wherein a first end of the current limiting resistor R3 is connected to a second end of the resistor R1, and a second end of the current limiting resistor R3 is connected to the control module for outputting the detection result HGQ-X1. The current limiting resistor R3 is used for limiting current, and damage to the control module caused by overlarge current of the electric signal of the detection result fed back by the current detection module is avoided.

Fig. 3 is a schematic structural diagram of a flameout protection circuit of a gas appliance according to an embodiment of the present invention, as shown in fig. 3, and in an exemplary embodiment of the present invention, a control module 120 includes a first control chip U1 and a second control chip U2, the first control chip U1 and the second control chip U2 are communicatively connected, a driving module 130 includes a first driving unit 131 and a second driving unit, and a switching module 140 includes a first switching unit 141 and a second switching unit 142.

The current detection module 110 is connected to the first control chip U1 and the second control chip U2, respectively. As shown in fig. 2 and 3, the output end of the current detection module outputs the same detection results HGQ-X1 and HGQ-X through a current limiting resistor R3 and a current limiting resistor R4, respectively, wherein a second end of the current limiting resistor R3 is connected to the first control chip U1, and a second end of the current limiting resistor R4 is connected to the second control chip U2.

The first control chip U1 is connected to the first driving unit 131, and the second control chip U2 is connected to the second driving unit.

The first end of the first switching unit 141 is connected to the second end of the solenoid valve, the second end of the first switching unit 141 is connected to the first end of the second switching unit 142, and the second end of the second switching unit 142 is grounded.

The control end of the first switching unit 141 is connected to the first driving unit 131, and the control end of the second switching unit 142 is connected to the second driving unit.

Under normal conditions, when the gas appliance is started, the hot-face igniter obtains working current. The current detection module 110 detects the operation current and feeds back the detection result to the first control chip U1 and the second control chip U2. The first control chip U1 transmits a first valve-opening signal to the first driving unit 131, and the first driving unit 131 transmits a turn-on control signal to the first switching unit 141 in response to the first valve-opening signal, driving the first switching unit 141 to be turned on. After sending the first valve opening signal, the first control chip U1 sends a first feedback signal to the second control chip U2. The second control chip U2 sends a second valve opening signal to the second driving unit after the detection result shows that the working current exists and the first feedback signal is received, the second driving unit responds to the second valve opening signal and sends a conduction control signal to the second switching unit 142, the second switching unit 142 is driven to be conducted, a loop where the electromagnetic valve is located is conducted, the electromagnetic valve is opened, fuel gas and air enter the combustor, and the fuel gas and air are ignited by the hot-face igniter. The invention controls the opening and closing of the electromagnetic valve through the first switch unit 141 and the second control unit 142, the current detection module 110 outputs two paths of detection results to the first control chip U1 and the second control chip U2 respectively, and when the two paths of detection results are all working currents of the hot-face igniter, the valve opening signal is sent to the driving module 130 to drive the first switch unit 141 and the second control unit 142 to be conducted, so that a loop where the electromagnetic valve is located is conducted, the electromagnetic valve is opened, the situation that misconduction possibly occurs in single-path control (for example, a single control chip is adopted, and the fault of the control chip possibly leads to the wrong conduction of the switch module and the electromagnetic valve) is avoided, and the stability of the gas appliance is improved.

Fig. 4 is a schematic diagram of a first control chip provided in an embodiment of the present invention, fig. 5 is a schematic diagram of a second control chip provided in an embodiment of the present invention, fig. 6 is a circuit diagram of a driving module and a switching module provided in an embodiment of the present invention, as shown in fig. 6, the driving module includes two first driving units and one second driving unit, and the switching module 140 includes two first switching units 1411, 1412 and one second switching unit 142. The first switching units 1411, 1412 and the second switching unit 142 are connected in series in a circuit in which the solenoid valve DCF is located. The input end of one first driving unit is connected with the first control chip U1 and is used for receiving a valve opening signal or a valve closing signal DCF-X1 output by the first control chip U1, the input end of the other first driving unit is connected with the second control chip U2 and is used for receiving a valve opening signal or a valve closing signal DCF-X2 output by the second control chip U2, and the input end of the second driving unit is connected with the second control chip U2 and is used for receiving a valve opening signal or a valve closing signal DCF-X3 output by the second control chip U2. The model of the first control chip U1 is M86ED02AN, and the model of the second control chip U2 is SC92F7546. According to the embodiment of the invention, the two first driving units are respectively connected with the first driving chip and the second driving chip, so that misleading possibly occurring in single-way control is avoided, and the stability of the gas appliance is improved.

Illustratively, in some embodiments of the present invention, the first switching unit 1411 includes a first electronic switching tube Q1, the first switching unit 1412 includes an electronic switching tube Q2, and the second switching unit 142 includes a second electronic switching tube Q3. The electronic switching transistors Q1, Q2 and Q3 may be field effect transistors or triodes, and embodiments of the present invention are not limited herein.

The first end of the first electronic switching tube Q1 is connected with the second end of the electromagnetic valve DCF, the second end of the first electronic switching tube Q1 is connected with the first end of the electronic switching tube Q2, the second end of the electronic switching tube Q2 is connected with the first end of the second electronic switching tube Q3, and the second end of the second electronic switching tube Q3 is grounded.

The control end of the first electronic switching tube Q1 is connected with the first driving unit, the control end of the electronic switching tube Q2 is connected with the first driving unit, and the control end of the second electronic switching tube Q3 is connected with the second driving unit.

In some embodiments of the present invention, the first valve-opening signal received by the first driving unit is a pulse signal, and the first valve-closing signal may be at a zero level. By way of example, the first driving unit in the present invention will be exemplarily described by taking one of the first driving units as an example. As shown in fig. 6, the first driving unit includes an inverter subunit 1311, a rectifier subunit 1312, a voltage stabilizing filter subunit 1313, and a voltage dividing subunit 1314.

The first end of the inverter subunit 1311 is connected to the power supply VCC, the second end of the inverter subunit 1311 is grounded, the input end of the inverter subunit 1311 is connected to the first control chip U1, and is configured to receive a first valve opening signal DCF-X1 output by the first control chip U1, the output end of the inverter subunit 1311 is connected to the input end of the rectifier subunit 1312, and the inverter subunit 1311 is configured to convert direct current of the power supply VCC into alternating current under the control of the first valve opening signal DCF-X1.

An output of the rectifying sub-unit 1312 is connected to an input of the voltage stabilizing filter sub-unit 1313. The output terminal of the voltage stabilizing filter subunit 1313 is connected to the control terminal of the first switch unit 1411 and the first terminal of the voltage dividing subunit 1314, respectively, and the second terminal of the voltage dividing subunit 1314 is grounded. The rectifying subunit 1312 is configured to rectify the ac power output from the inverting subunit 1311, and convert the ac power into dc power. The voltage stabilizing and filtering subunit 1313 is configured to perform voltage stabilizing and filtering processing on the dc power output by the rectifying subunit 1312, so as to improve stability of the electrical signal received by the control unit of the first switch unit 1411. The voltage divider subunit 1314 is configured to divide voltage to avoid the damage of the first switch unit 1411 caused by the excessive voltage of the control terminal of the first switch unit 1411.

In some embodiments of the present invention, as shown in fig. 6, the inverter sub-unit 1311 includes a first resistor R5, a third electronic switching tube Q4, and a first capacitor C3.

The first end of the first resistor R5 is connected to the power VCC, and the second end of the first resistor R5 is connected to the first end of the third electronic switching tube Q4. The second end of the third electronic switching tube Q4 is grounded, and the control end of the third electronic switching tube Q4 is connected with the first control chip U1 through a current limiting resistor R6 and is used for receiving a first valve opening signal or a first valve closing signal DCF-X1. Illustratively, the control terminal and the second terminal of the third electronic switching tube Q4 are connected through a voltage dividing resistor R7. The first end of the first capacitor C3 is connected to the first end of the third electronic switching tube Q4 through the current limiting resistor R8, and the second end of the first capacitor C3 is connected to the input end of the rectifying subunit 1312.

The first valve-opening signal DCF-X1 is a pulse signal, the third electronic switching tube Q4 is turned on in a positive half cycle of the pulse signal, the power source VCC charges the first capacitor C3, and the third electronic switching tube Q4 is turned off in a negative half cycle of the pulse signal, and the first capacitor C3 discharges, thereby converting the direct current of the power source VCC into the alternating current.

In some embodiments of the present invention, as shown in fig. 6, the rectifying sub-unit 1312 includes a first unidirectional diode D1 and a second unidirectional diode D2. The anode of the first unidirectional diode D1 is connected to the output terminal of the inverter subunit 1311 (i.e., the second terminal of the first capacitor C3), and the cathode of the first unidirectional diode D1 is connected to the input terminal of the voltage stabilizing filter subunit 1313. The anode of the second unidirectional diode D2 is grounded, and the cathode of the second unidirectional diode D2 is connected to the output terminal of the inverter sub-unit 1311. The first unidirectional diode D1 and the second unidirectional diode D2 constitute a half-bridge rectifier circuit.

In some embodiments of the present invention, as shown in fig. 6, the voltage stabilizing filter subunit 1313 includes a second capacitor C4 and a second resistor R9, and the voltage dividing subunit 1314 includes a third resistor R10. Wherein, a first end of the second capacitor C4 is connected to an output end of the rectifying subunit 1312 (i.e. a cathode of the first unidirectional diode D1), and a second end of the second capacitor C4 is grounded. The first end of the second resistor R9 is connected to the first end of the second capacitor C4, and the second end of the second resistor R9 is connected to the control end of the first switching unit 1411 (i.e., the control end of the first electronic switching tube Q1). A first end of the third resistor R10 is connected to the control end of the first switching unit 1411, and a second end of the third resistor R10 is grounded.

The circuit structures of the two first driving units are identical, and the circuit structure of the other first driving unit is not described herein again.

For example, the second valve opening signal or the second valve closing signal received by the second driving unit is a high level signal and a low level signal, as shown in fig. 6, and the control end of the second electronic switching tube Q3 is connected to the second control chip U2 through the current limiting resistor R11. The control end and the second end of the second electronic switching tube Q3 are also connected through a voltage dividing resistor R12. When the control end of the second electronic switching tube Q3 receives the high-level signal sent by the second control chip U2, the second electronic switching tube Q3 is turned on, and when the control end of the second electronic switching tube Q3 receives the low-level signal sent by the second control chip U2, the second electronic switching tube Q3 is turned off.

According to the embodiment of the invention, the on-off of the switch module is controlled by two different valve opening signals together, so that misleading caused by the occurrence of a fault of one of the signals is avoided, and the stability of the gas appliance is improved.

IN some embodiments of the present invention, as shown IN fig. 6, the flameout protection circuit for a gas appliance further includes a conduction detection module 150, an input end of the conduction detection module 150 is connected to a first end of the switch module, an output end of the conduction detection module 150 is connected to the control module, and the conduction detection module is configured to detect whether the switch module is turned on or not, and feed back a detection result DCF-X-IN to the control module, so that the control module confirms the on/off condition of the switch module 140.

For example, in the starting process of the gas appliance, before the control module sends the valve opening signal to the driving module, if the control module receives the conduction signal fed back by the conduction detection module 150, which indicates that the switching module is short-circuited, the gas appliance is controlled to be turned off, so that gas leakage is avoided.

Illustratively, as shown in FIG. 6, the turn-on detection module 150 includes a resistor R13, a resistor R14, and a resistor R15. The first end of the resistor R13 is connected to the first end of the first electronic switching tube Q1, the second end of the resistor R13 is connected to the first end of the resistor R14, and the second end of the resistor R14 is connected to the second control chip U2, so as to feed back a feedback signal DCF-X-IN indicating the on-off condition of the switching module 140 to the second control chip U2. The first end of the resistor R15 is connected with the second end of the resistor R13, the second end of the resistor R15 is grounded, and the resistor R15 plays a role in voltage division. Illustratively, in an embodiment of the present invention, the conduction detection module 150 further includes a unidirectional diode D3, a first end of the solenoid valve DCF is connected to a cathode of the unidirectional diode D3, and a second end of the solenoid valve DCF is connected to an anode of the unidirectional diode D3. The unidirectional diode D3 is configured to release the reverse electromotive force in the solenoid valve DCF at the instant of power failure and disconnection of the solenoid valve DCF, so as to avoid damage to the solenoid valve DCF due to excessive directional electromotive force.

The invention also provides a gas appliance, which comprises an electromagnetic valve, a hot-surface igniter, a burner and the flameout protection circuit of the gas appliance provided by any embodiment. The electromagnetic valve is connected with the burner through a pipeline, the hot-face igniter is connected with the power supply, and the hot-face igniter is arranged at the air outlet of the burner. The specific structure and working principle of the flameout protection circuit of the gas appliance are described in detail in the foregoing embodiments, and the embodiments of the present invention are not described herein again.

The invention provides a gas appliance, which comprises an electromagnetic valve, a hot-surface igniter, a burner and a flameout protection circuit of the gas appliance, wherein the flameout protection circuit is provided by any embodiment. The electromagnetic valve is connected with the burner through a pipeline, the hot-face igniter is connected with the power supply, and the hot-face igniter is arranged at the air outlet of the burner. When the hot-face igniter does not have working current, the invention indicates that the gas appliance is flameout, the flameout protection circuit of the gas appliance controls the electromagnetic valve to be closed, and the gas is stopped to be input into the burner, so that the gas leakage is avoided, the flameout protection function is realized, the problem that the protection function is invalid or the gas appliance is unstable to use due to the adoption of the flame induction needle is avoided, and the use safety and stability of the gas appliance are high.

Fig. 7 is a schematic structural diagram of a combustion apparatus according to an embodiment of the present invention, which is a gas oven, and as shown in fig. 7, the combustion apparatus includes a three-way electromagnetic valve 10, a first burner 21, a second burner 22, a first hot-face igniter 31, a second hot-face igniter 32, and a power control board 40. The three-way electromagnetic valve 10 includes an intake valve, a first exhaust valve, and a second exhaust valve. Wherein the first burner 21, the second burner 22, the first hot-face igniter 31 and the second hot-face igniter 32 are disposed within the combustion chamber 50.

The air inlet valve is connected with the main fuel gas pipeline through a pipeline and is used for controlling whether fuel gas is input into the three-way electromagnetic valve 10. The first gas outlet valve is connected to the first burner 21 through a pipe for controlling whether the gas is inputted to the first burner 21. The second gas outlet valve is connected to the second burner 22 by a pipe for controlling whether the gas is input to the second burner. The first hot-side igniter 31 is disposed at the air outlet of the first burner 21, and the second hot-side igniter 32 is disposed at the air outlet of the second burner 22.

The gas appliance comprises two flameout protection circuits of the gas appliance according to any of the previous embodiments, for controlling the first gas outlet valve and the second gas outlet valve, respectively. Both gas appliance flameout protection circuits are integrated into power control board 40. The power control board 40 is connected to the first hot side igniter 31 and the second hot side igniter 32, and is used for supplying power to the first hot side igniter 31 and the second hot side igniter 32, and collecting working current of the first hot side igniter 31 and the second hot side igniter 32. The power control board 40 supplies power to the air inlet valve, the first air outlet valve and the second air outlet valve, and the air inlet valve, the first air outlet valve and the second air outlet valve respectively.

Illustratively, as shown in fig. 7, the gas appliance further includes an on-line pressure stabilizing valve 60 disposed between the three-way electromagnetic valve and the main gas line, for stabilizing the gas pressure entering the three-way electromagnetic valve 10, and avoiding unstable combustion.

Illustratively, as shown in FIG. 7, the gas appliance further includes a touch control panel 70, the touch control panel 70 being coupled to the power control panel 40 for receiving user interaction data. For example, a user may set a heating time, a heating gear, a heating temperature, control one or both burners to operate, etc. through a touch control panel.

Illustratively, as shown in fig. 7, a temperature sensor 81, for example, a thermistor NTC, is further disposed in the combustion chamber 50 of the gas appliance, and the temperature sensor 81 is connected to the power control board 40 for acquiring the temperature in the combustion chamber 50.

Illustratively, as shown in fig. 7, the gas appliance further includes a cross flow fan 82, one end of the cross flow fan 82 is connected to the power control board 40, and the other end is connected to an external power supply 84 through a snap-action thermostat 83. The power control board 40 is connected to an external power supply 84 through a snap-action thermostat 83. The cross-flow fan 82 is used for heat dissipation of the whole machine.

Illustratively, when the burner is powered up to enter the standby state, the touch control board 70 selects a required functional gear mode (such as the second burner 22 is operated), after the heating temperature is set, a start key is pressed, the second hot-face igniter 32 is powered on to start operating and heating, and after a preset time (for example, 7 seconds), the power control board 40 is powered on to signal the three-way electromagnetic valve 10 to control the second air outlet valve to be opened. The fuel gas enters the second burner 22 and is ignited by a second hot-face igniter 32. When the temperature reaches the set heating temperature, the temperature sensor 81 feeds back a signal to the power control board 40, cuts off the working current of the second hot-face igniter 32, and simultaneously controls the second air outlet valve to be closed, and the second burner 22 stops heating. When the temperature drops, the temperature sensor 81 feeds back a signal to the power control board 40, and controls the second hot-face igniter 32 to be electrified, and the second air outlet valve is opened, so that ignition is started again. The circulation is performed in this way, so that the purpose of stable temperature control is achieved. When abnormal high temperature occurs, the circuit of the whole machine is automatically cut off when the kick temperature controller 83 detects the abnormal temperature, and the whole machine stops ventilation at the moment, so that the safety and the reliability of the whole machine are ensured.

Illustratively, as shown in fig. 7, a rear heat generating pipe 91 and a rear blower 92 are further provided inside the combustion chamber 50. The rear heat pipe 91 and the rear fan 92 are provided on the inner wall of the combustion chamber 50. Rear heat pipe 91 and rear blower 92 are connected to power control board 40, and power control board 40 is used to supply power to rear heat pipe 91 and rear blower 92. The rear heating tube 91 can be an electric heating tube, can be used for selecting a low-temperature heat preservation function and a dough fermentation function, and is matched with the rear fan 92 to accelerate heat diffusion in the combustion chamber 50, so that the temperature in the combustion chamber 50 is controlled between 45 ℃ and 70 ℃.

The outer wall of the complete machine is provided with an indicator lamp 93, and the indicator lamp 93 is connected to the loops of the first burner 21, the second burner 22, the cross-flow fan 82, and the like, and is used for indicating whether the complete machine works normally.

Illustratively, the gas appliance also includes a door control switch 94, the door control switch 94 being connected to the power control board 40. During the operation of the blower 92 after the start, if the door of the burner is opened, the door control switch 94 can feed back a signal to cut off the operation of the blower 92, so as to avoid the internal hot air from being blown out and injuring the user.

In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims (11)

1. The flameout protection circuit of the gas appliance is characterized by comprising a current detection module (110), a control module (120), a driving module (130) and a switch module (140);

the current detection module (110) is respectively connected with a hot-face igniter of the gas appliance and the control module (120) and is used for detecting whether working current exists in the hot-face igniter or not and sending a detection result to the control module (120);

the control module (120) is connected with the driving module (130), and the driving module (130) is connected with the control end of the switch module (140);

a first end of a solenoid valve of the gas appliance is connected with a power supply, a second end of the solenoid valve is connected with a first end of the switch module (140), and a second end of the switch module (140) is grounded;

and when the detection result shows that no working current exists, the control module (120) sends a valve closing signal to the driving module (130), the driving module (130) responds to the valve closing signal to drive the switch module (140) to be disconnected, and the electromagnetic valve is closed to stop inputting fuel gas to the combustor.

2. The gas appliance flameout protection circuit according to claim 1, wherein the current detection module (110) includes a current transformer (111), a rectifying unit (112), a voltage stabilizing filter unit (113), and a voltage dividing unit (114);

The input end of the current transformer (111) is connected in a power supply loop of the hot-face igniter, and the output end of the current transformer (111) is connected with the input end of the rectifying unit (112);

the output end of the rectifying unit (112) is connected with the input end of the voltage stabilizing and filtering unit (113);

the output end of the voltage stabilizing filter unit (113) is respectively connected with the first end of the voltage dividing unit (114) and the control module (120);

the second end of the voltage dividing unit (114) is grounded.

3. The gas appliance flameout protection circuit according to claim 1 or 2, wherein the control module (120) comprises a first control chip (U1) and a second control chip (U1), the first control chip (U1) and the second control chip (U2) being communicatively connected, the drive module (130) comprises a first drive unit (131) and a second drive unit (132), the switch module (140) comprises a first switch unit (141) and a second switch unit (142);

the current detection module (110) is respectively connected with the first control chip (U1) and the second control chip (U2);

the first control chip (U1) is connected with the first driving unit (131), and the second control chip (U2) is connected with the second driving unit (132);

A first end of the first switch unit (141) is connected with a second end of the electromagnetic valve, a second end of the first switch unit (141) is connected with a first end of the second switch unit (142), and a second end of the second switch unit (142) is grounded;

the control end of the first switch unit (141) is connected with the first driving unit (131), and the control end of the second switch unit (142) is connected with the second driving unit (132);

when the detection result is that working current exists, the first control chip (U1) sends a first valve opening signal to the first driving unit (131), the first driving unit (131) responds to the first valve opening signal to drive the first switching unit (141) to be conducted, and the first control chip (U1) sends a first feedback signal to the second control chip (U2) after sending the first valve opening signal;

and the second control chip (U2) sends a second valve opening signal to the second driving unit (132) after the detection result shows that working current exists and the first feedback signal is received, the second driving unit (132) responds to the second valve opening signal to drive the second switching unit (142) to be conducted, and the electromagnetic valve is opened.

4. A gas appliance flameout protection circuit according to claim 3, characterized in that the first switching unit (141) comprises a first electronic switching tube (Q1) and the second switching unit comprises a second electronic switching tube (Q3);

the first end of the first electronic switching tube (Q1) is connected with the second end of the electromagnetic valve, the second end of the first electronic switching tube (Q1) is connected with the first end of the second electronic switching tube (Q3), and the second end of the second electronic switching tube (Q3) is grounded;

the control end of the first electronic switching tube (Q1) is connected with the first driving unit (131), and the control end of the second electronic switching tube (Q3) is connected with the second driving unit (132).

5. A gas appliance flameout protection circuit according to claim 3, wherein the first valve opening signal is a pulse signal, and the first driving unit (131) includes an inverter subunit (1311), a rectifier subunit (1312), a voltage stabilizing filter subunit (1313) and a voltage dividing subunit (1314);

the first end of the inverter subunit (1311) is connected with a power supply, the second end of the inverter subunit (1311) is grounded, the input end of the inverter subunit (1311) is connected with the first control chip (U1) and is used for receiving a first valve opening signal output by the first control chip (U1), the output end of the inverter subunit (1311) is connected with the input end of the rectifier subunit (1312), and the inverter subunit (1311) is used for converting direct current of the power supply into alternating current under the control of the first valve opening signal;

The output end of the rectifying subunit (1312) is connected with the input end of the voltage stabilizing and filtering subunit (1313);

the output end of the voltage stabilizing filter subunit (1313) is respectively connected with the control end of the first switch unit (141) and the first end of the voltage dividing subunit (1314);

the second end of the voltage dividing subunit (1314) is grounded.

6. The gas appliance flameout protection circuit according to claim 5, characterized in that the inverter subunit (1311) comprises a first resistor (R5), a third electronic switching tube (Q4) and a first capacitor (C3);

a first end of the first resistor (R5) is connected with a power supply, and a second end of the first resistor (R5) is connected with a first end of the third electronic switch tube (Q4);

the second end of the third electronic switching tube (Q4) is grounded, and the control end of the third electronic switching tube (Q4) is connected with the first control chip (U1) and is used for receiving the first valve opening signal or the first valve closing signal;

the first end of the first capacitor (C3) is connected with the first end of the third electronic switch tube (Q4), and the second end of the first capacitor (C3) is connected with the input end of the rectifier subunit (1312).

7. The gas appliance flameout protection circuit according to claim 5, characterized in that the rectifying sub-unit (1312) comprises a first unidirectional diode (D1) and a second unidirectional diode (D2);

The anode of the first unidirectional diode (D1) is connected with the output end of the inversion subunit (1311), and the cathode of the first unidirectional diode (D1) is connected with the input end of the voltage stabilizing and filtering subunit (1313);

the anode of the second unidirectional diode (D2) is grounded, and the cathode of the second unidirectional diode (D2) is connected with the output end of the inverter subunit (1311).

8. The gas appliance flameout protection circuit according to claim 5, wherein the voltage stabilizing filter subunit (1313) comprises a second capacitor (C4) and a second resistor (R9), and the voltage dividing subunit (1314) comprises a third resistor (R10);

a first end of the second capacitor (C4) is connected with the output end of the rectifying subunit (1312), and a second end of the second capacitor (C4) is grounded;

a first end of the second resistor (R9) is connected with a first end of the second capacitor (C4), and a second end of the second resistor (R9) is connected with a control end of the first switch unit (141);

the first end of the third resistor (R10) is connected with the control end of the first switch unit (141), and the second end of the third resistor (R10) is grounded.

9. The flameout protection circuit of a gas appliance according to any one of claims 1, 2, 4-8, further comprising a conduction detection module (150), wherein an input end of the conduction detection module (150) is connected to a first end of the switch module (140), an output end of the conduction detection module (150) is connected to the control module (120), and the conduction detection module (150) is configured to detect whether the switch module (140) is turned on;

Before the control module (120) sends a valve opening signal to the driving module (130), if the control module (120) receives a conduction signal fed back by the conduction detection module (150), the gas appliance is controlled to be turned off.

10. A gas appliance, which is characterized by comprising an electromagnetic valve, a hot-face igniter, a burner and a flameout protection circuit of the gas appliance according to any one of claims 1-9;

the electromagnetic valve is connected with the burner through a pipeline;

the hot-face igniter is connected with a power supply and is arranged at the air outlet of the combustor.

11. The gas appliance according to claim 10, wherein the solenoid valve is a three-way solenoid valve (10) comprising an inlet valve, a first outlet valve and a second outlet valve, the gas appliance comprising a first burner (21), a second burner (22), a first hot-face igniter (31) and a second hot-face igniter (32);

the air inlet valve is connected with the main fuel gas pipeline through a pipeline, the first air outlet valve is connected with the first burner (21) through a pipeline, and the second air outlet valve is connected with the second burner (22) through a pipeline;

the first hot-face igniter (31) is arranged at the air outlet of the first combustor (21), and the second hot-face igniter (32) is arranged at the air outlet of the second combustor (22);

The gas appliance comprises two gas appliance flameout protection circuits which are respectively used for controlling the first gas outlet valve and the second gas outlet valve.