Dual-gas source gas control system with anti-gas source misconnection and control circuit thereof

A dual-gas source gas control system with anti-gas source misconnection and a control circuit thereof belonging to the gas combustion technical field are provided. The disclosure solves unreasonable design and other problems in the related art. The dual-gas source gas control system with anti-gas source misconnection and the control circuit thereof includes a power-on circuit, connected in series with an external power supply and an igniter switch to form a loop, including a self-locking switch triode connected in series with the external power supply and a self-locking amplifying triode connected to a base electrode of the self-locking switch triode; an MCU control circuit, including an MCU control chip, wherein the power-on circuit is connected to a power input pin of the MCU control chip, one pin on the MCU control chip is configured to detect whether the power-on circuit is connected.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serial no. 201910175998.1, filed on Mar. 8, 2019. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to a gas combustion technical field, and in particular, relates to a dual-gas source gas control system with anti-gas source misconnection and a control circuit thereof.

Description of Related Art

With the diversification of energy in the global market, many countries are using both natural gas and liquefied petroleum gas. According to the difference between the calorific values and the pressure during use of these two types of gas: liquefied petroleum gas is a high calorific value gas, and the pressure during use is high, and natural gas is a low calorific value gas, and the pressure is low during use. Gas appliances that match two different energy sources are thus provided. In order to integrate resources and meet market demand, gas appliances are designed as dual gas control systems that can use natural gas as well as liquefied petroleum gas.

The operating principle of the existing dual gas source gas control system is provided as follows. After high calorific value gas is introduced into a high calorific value gas voltage regulator valve, the gas passes through a high calorific value gas voltage regulator valve for voltage stabilizing and enters a switch control valve. A knob of a switch control valve is pressed, so that the gas is inputted into a gas path conversion device from the switch control valve. At this moment, the gas path in the gas path conversion device is manually set as a high calorific value gas path. After passing through the high calorific value gas path inside the gas path conversion device, the gas is inputted to a high calorific value gas lighter first. The igniter is pressed, the high calorific value gas in the high calorific value gas lighter is ignited by an igniter needle, and the high calorific value gas burns a nearby thermocouple after being burned. The thermocouple continues to supply power to a solenoid valve in the switch control valve. After the solenoid valve in the switch control valve begins to function, the gas path leading to a high calorific value gas nozzle mouth in the switch control valve is opened. The knob of the switch control valve is rotated, and the gas is inputted into the high calorific value gas nozzle mouth in the gas path conversion device and is directly inputted into the main burner after passing though the high calorific value gas nozzle mouth. The high calorific value gas outputted from the burner of the main burner is ignited by pilot flame on the high calorific value gas lighter. The gas appliance begins to work normally at this moment. After low calorific value gas is introduced into a low calorific value gas voltage regulator valve, the gas passes through a low calorific value gas voltage regulator valve for voltage stabilizing and enters a switch control valve. A knob of a switch control valve is pressed, so that the gas is inputted into a gas path conversion device from the switch control valve. At this moment, the gas path in the gas path conversion device is manually set as a low calorific value gas path. After passing through the low calorific value gas path in the gas path conversion device, the gas is inputted to a low calorific value gas lighter first. The igniter is pressed, the low calorific value gas in the low calorific value gas lighter is ignited by an igniter needle, and the low calorific value gas burns a nearby thermocouple after being burned. The thermocouple continues to supply power to a solenoid valve in the switch control valve. After the solenoid valve in the switch control valve begins to function, the gas path leading to a low calorific value gas nozzle mouth in the switch control valve is opened. The knob of the switch control valve is rotated, and the gas is inputted into the low calorific value gas nozzle mouth in the gas path conversion device and is directly inputted into the main burner after passing though the low calorific value nozzle mouth. The low calorific value gas outputted from the burner of the main burner is ignited by pilot flame on the low calorific value gas lighter, and the gas appliance begins to work normally at this moment.

Since manual operation is required by gas connection and gas path configuration of a gas path conversion device, misconnection may happen. Since the calorific values and pressures of the two types of gas are different during use, when high calorific value gas enters the wrong gas operating channel, the risk of presence of a high flame appears, and safety and property of a user may thereby be threatened.

SUMMARY

A purpose of the disclosure is to provide a reasonably-designed control circuit for solving the problems of which high calorific value gas is misconnected to a low calorific value voltage regulator valve and enters a low calorific value gas lighter, and a solenoid valve in a switch control valve cannot be automatically closed instantly when the high calorific value gas simultaneously enters a first main gas nozzle mouth and a second main gas nozzle mouth in terms of the foregoing problems.

Another purpose of the disclosure is to provide a reasonably-designed dual-gas source gas control system with anti-gas source misconnection offering high degree of safety and security in terms of the foregoing problems.

Still another purpose of the disclosure is to provide another reasonably-designed dual-gas source gas control system with anti-gas source misconnection offering safety and security in terms of the foregoing problems.

To accomplish the foregoing purposes, the following technical solutions are adopted by the disclosure. A control circuit provided by the disclosure includes a power-on circuit, connected in series with an external power supply and an igniter switch to form a loop, including a self-locking switch triode connected in series with the external power supply and a self-locking amplifying triode connected to a base electrode of the self-locking switch triode; an MCU control circuit, including an MCU control chip, wherein the power-on circuit is connected to a power input pin of the MCU control chip, one pin on the MCU control chip is configured to detect whether the power-on circuit is connected, another pin on the MCU control chip is connected to a base electrode of the self-locking amplifying triode in the power-on circuit to be configured to send a driving signal to drive the self-locking amplification triode in the power-on circuit to be turned on when the power-on circuit is detected to be connected, so that the self-locking switch triode and the self-locking amplifying triode are turned on to form self-locking and maintain a power-on state; a pulse ignition circuit, including an oscillating loop powered by the power-on circuit, wherein the oscillating loop generates an inducted ignition high voltage and discharges to an outside through an external low calorific value gas ignition needle and a high calorific value gas ignition needle connected thereto, and one pin on the MCU control chip sends a control signal to control magnitude of an oscillating voltage of the oscillating loop; a gas misconnection flame detection circuit, including a comparator powered by the power-on circuit and configured for receiving a flame signal sent from an external flame sensor, wherein a voltage signal generated by the flame sensor is transmitted to one input pin of the comparator, the flame signal is outputted from an output pin of the comparator to a base electrode of a detection amplifying triode connected to the comparator, the flame signal passing through the detection amplifying triode is transmitted onto the MCU control chip through an input pin on the MCU control chip that is connected to the detection amplification triode and that is configured for receiving the flame signal, the flame sensor generates a negative voltage signal to the input pin configured for receiving the flame signal on the comparator when a high calorific value gas is misconnected to a low calorific value gas lighter, the output pin configured for outputting the flame signal on the comparator outputs a high electrical level to the base electrode of the detection amplifying triode, the detection amplifying triode transmits the amplified flame signal to the input pin configured for receiving the flame signal on the MCU control chip, after an output pin on the MCU control chip that is configured for sending a driving signal for driving a gas path to be cut off receives the flame signal indicating misconnection, the output pin sends the driving signal configured for driving the gas path to be cut off to an external corresponding gas path on/off control device, and a cutting off operation of a first solenoid valve in a switch control valve is controlled by the gas path on/off control device. The flame signal transmitted by the external flame sensor connected thereto is detected through the gas misconnection flame detection circuit and the signal is sent to the MCU control circuit. A driving signal configured for driving the gas path to be cut off to an external corresponding gas path on/off control device is sent from the MCU control circuit. In this way, when the high calorific value gas is misconnected to the low calorific value voltage regulator valve, enters the low calorific value gas lighter, and simultaneously enters the first main gas nozzle mouth and the second main gas nozzle mouth, safety and security are provided.

In the control circuit, the output pin on the MCU control chip configured for transmitting the driving signal for driving the gas path to be cut off is disposed on a wire of opposite polarity to the output pin in two wires connected an external thermocouple parallel circuit and the external first solenoid valve. The thermocouple parallel circuit is formed by a connection between an anode of a low calorific value gas thermocouple and an anode of a high calorific value gas thermocouple and a connection between a cathode of the low calorific value gas thermocouple and a cathode of the high calorific value gas thermocouple. When the input pin of the MCU control chip connected to the gas misconnection flame detection circuit detects that the high calorific value gas is misconnected to the low calorific value gas lighter, the output pin on the MCU control chip outputs a voltage of polarity opposite to an output voltage of the thermocouple parallel circuit, so that current balancing is instantly and forcibly performed to a thermoelectric potential generated by the fired low calorific value gas thermocouple or the voltage is set to zero. The thermoelectric potential which keeps the first solenoid valve on the switch control valve to be closed is lost, and the first solenoid valve is not closed to prevent external gas from entering the gas path of the system through the switch control valve. When the high calorific value gas is misconnected to the low calorific value voltage regulator valve, the first solenoid valve on the switch control valve may be set not to be closed to prevent external gas from entering, so that the purpose of safety, prevention, and control is achieved.

In the control circuit, a pair of anode and cathode power output pins configured for transmitting the driving signal for driving the gas path to be cut off on the MCU control chip is electrically connected to the external low calorific value gas lighter and a second solenoid valve in an on/off valve on a low calorific value ignition gas path between output ends corresponding to the low calorific value gas lighter on a gas path conversion valve through a motor control driver chip. When the input pin connected to the gas misconnection flame detection circuit on the MCU control chip detects that the high calorific value gas is misconnected to the low calorific value gas lighter, the pair of anode and cathode power output pins transmits the driving signal for driving the gas path to be cut off, so that the second solenoid valve which is being closed on the on/off valve is detached instantly to close the low calorific value ignition gas path.

A gas flame is reduced until being put out without burning the low calorific value gas thermocouple, such that the low calorific value gas thermocouple cannot continuously supply power to the first solenoid valve in the switch control valve. The first solenoid valve in the switch control valve which does not receive power supply is not closed to prevent external gas from entering the gas path in the system through the switch control valve. When the high calorific value gas is misconnected to the low calorific value voltage regulator valve, a switching off signal is outputted to the second solenoid valve on the on/off valve connected to the MCU control circuit through the MCU control circuit, so that the second solenoid valve in a closed state is instantly opened. The flame of the low calorific value gas lighter may thus be extinguished since no low calorific value gas is continuously supplied. The thermocouple no longer generates a thermoelectric potential since no flame is sensed and thus may not provide electricity energy to the first solenoid valve connected thereto on the switch control valve. In this way, the first solenoid valve is not closed to prevent external gas from entering the gas path.

The control circuit further includes a boost circuit connected to the power-on circuit and including a boost chip and an inductor. A power output pin of the boost chip transmits a boosted voltage to any one or a plurality of the MCU control circuit, the pulse ignition circuit and the gas misconnection flame detection circuit. Arrangement of the booster circuit improves the voltage supply capability to other circuits in the control circuit.

In the control circuit, an alarm circuit including a buzzer and an alarm amplifying triode is also included, and a base electrode of the alarm amplifying triode receives an alarm signal sent from an output pin on the MCU control chip. Arrangement of the alarm circuit enables a user to obtain alarm information immediately, and total gas paths may be closed through a knob on the switch control valve through manual operation.

In the control circuit, an electronically controlled conversion valve control circuit is also provided and includes a first valve driving chip configured for driving a main gas channel switching solenoid valve in an external electronically controlled gas path conversion valve, and a second valve driving chip configured for controlling and driving an ignition gas channel switching solenoid valve in the external electronically controlled gas path conversion valve. The first valve driving chip and the second valve driving chip respectively receive valve control information sent from the MCU control chip. Two pins in the MCU control chip are respectively connected in series with a low calorific value voltage regulator switching switch in an external low calorific value voltage regulator valve and a high calorific value voltage regulator switching switch in a high calorific value voltage regulator valve. When receiving information on the low calorific value voltage regulator switching switch or the high calorific value voltage regulator switching switch being in a closed state, the MCU control chip sends the corresponding valve control information to the first valve driving chip and the second valve driving chip.

A dual-gas source gas control system with anti-gas source misconnection includes a low calorific value voltage regulator valve and a high calorific value voltage regulator valve. An input end and an output end of the low calorific value voltage regulator valve are respectively connected to a low calorific value gas path configured for transmitting a low calorific gas source, and an input end and an output end of the high calorific value voltage regulator valve are respectively connected to a high calorific value gas path configured for transmitting a high calorific gas source. A switch control valve acts as a master switch configured for controlling a gas path to be cut off, is provided with a first solenoid valve configured for controlling the switch control valve to be turned on or turned off, and includes two input ends, wherein one of the input ends is connected to the low calorific value voltage regulator valve through the low calorific value gas path, and the other one of the input ends is connected the high calorific value voltage regulator valve through the high calorific value gas path, and further includes two output ends respectively connected to a main gas path and an ignition gas path one by one. A gas path conversion valve includes two input ends, wherein one of the input ends is connected to the output end of the switch control valve communicating with the main gas path, and the other one of the input ends is connected to the output end of the switch control valve communicating with the ignition gas path, and further includes four output ends, wherein the four output ends are respectively communicated with a low calorific value ignition gas path leading to a low calorific value gas ignition device, a high calorific value ignition gas path leading to a high calorific value gas ignition device, and a first main gas nozzle mouth and a second main gas nozzle mouth leading to a main burner one by one, further including a high calorific value gas internal path, a low calorific value gas internal path, and a knob or a switch configured for switching between the high calorific value gas internal path and the low calorific value gas internal path, wherein the low calorific value gas internal path is respectively communicated with low calorific value ignition gas path, the first main gas nozzle mouth, and a second main gas nozzle mouth, and the high calorific value gas internal path is respectively communicated with the high calorific value ignition gas path and the first main gas nozzle mouth. The main burner, wherein an input end thereof are disposed corresponding to the first main gas nozzle mouth and the second main gas nozzle mouth on the gas path conversion valve, so that gas emitted from the first main gas nozzle mouth and the second main gas nozzle mouth directly enters the input end of the main burner, and a burner opening required by high calorific value gas and low calorific value gas to burn normally is disposed at an outer side of the main burner. The low calorific value gas ignition device includes a low calorific value gas lighter near the burner opening required for burning of the low calorific value gas on the main burner and a low calorific value gas ignition needle and a low calorific value gas thermocouple disposed adjacent to the low calorific value gas lighter, wherein the low calorific value gas lighter is connected to a corresponding output end on the gas path conversion valve through the low calorific value ignition gas path. The high calorific value gas ignition device includes a high calorific value gas lighter near the burner opening required for burning of the high calorific value gas on the main burner and a high calorific value gas ignition needle and a high calorific value gas thermocouple disposed adjacent to the high calorific value gas lighter, wherein the high calorific value gas lighter is connected to a corresponding output end on the gas path conversion valve through the high calorific value ignition gas path; an igniter, electrically connected to the low calorific value gas ignition needle and the high calorific value gas ignition needle respectively. The system further includes a flame sensor disposed at one side near the low calorific value gas thermocouple and away from the low calorific value gas lighter, and configured for detecting a flame signal. The igniter is provided with a power supply and an error-proof control circuit electrically connected thereto, the error-proof control circuit is the control circuit electrically connected to the flame sensor, after an igniter switch on the igniter is pressed, electricity is transmitted to the connected control circuit, and the control circuit begins to function and receive the flame signal sent from the flame sensor; wherein an anode of the low calorific value gas thermocouple is connected to an anode of the high calorific value gas thermocouple, a cathode of the low calorific value gas thermocouple and a cathode of the high calorific value gas thermocouple are connected to form a thermocouple parallel circuit, an anode and a cathode of the thermocouple parallel circuit are electrically connected to an anode and a cathode of the first solenoid valve respectively one by one, one output end of the control circuit is disposed on one wire of opposite polarity to the output end in two wires connecting the thermocouple parallel circuit and the first solenoid valve, when the control circuit detects the flame signal from the flame sensor indicating that the high calorific value gas is misconnected to the low calorific value gas lighter, the output end outputs a voltage of opposite polarity to an output voltage outputted by the thermocouple parallel circuit, so that current balancing is instantly and forcibly performed to a thermoelectric potential generated by the fired low calorific value gas thermocouple or the voltage is set to zero, the first solenoid valve in the switch control valve without receiving power supply is not closed to prevent external gas from entering the gas path in the system through the switch control valve. When the high calorific value gas is misconnected to the low calorific value voltage regulator valve, a voltage of opposite polarity to an output voltage of the thermocouple parallel circuit is outputted through the control circuit, so that current balancing is instantly and forcibly performed to a thermoelectric potential generated by the fired low calorific value gas thermocouple or the voltage is set to zero to prevent external gas from entering.

In the dual-gas source gas control system with anti-gas source misconnection, an over voltage protection device is disposed on the low calorific value ignition gas path between the output ends corresponding to the low calorific value gas lighter on the low calorific value gas lighter and the gas path conversion valve. When the high calorific value gas is mistakenly introduced to the low calorific value gas lighter after passing through the high calorific value voltage regulator valve, or when the low calorific value gas is mistakenly passes through the high calorific value gas voltage regulator valve and is introduced to the low calorific value gas lighter, since the pressure of the gas in the low calorific value ignition gas path exceeds a pressure preset by the over voltage protection device, the over voltage protection device automatically closes the gas path at this moment.

In the dual-gas source gas control system with anti-gas source misconnection, the gas path conversion valve is a manual gas path conversion valve and includes a valve body, wherein an outer periphery of the valve body is provided with an internally-communicated low calorific value gas lighter outlet, a high calorific value gas lighter outlet, a gas lighter gas path inlet, and a main inlet; a spool is provided and is disposed in the valve body, a connection groove is disposed on an outer periphery of the spool, the spool rotates so that the connection groove is communicated with the low calorific value gas lighter outlet and the gas lighter gas path inlet or is communicated with the high calorific value gas lighter outlet and the gas lighter gas path inlet; a valve seat is provided and is disposed on an upper end of the valve body, a valve rod is slidably inserted into the valve seat, an upper end of the valve rod exposes out of the valve seat, a lower end of the valve rod is loosely connected to the other end of a connection rotation shaft with one end disposed on the spool, the connection rotation shaft is sleeved with a reset spring for resetting the valve rod after operation. The gas path conversion valve further includes a double gas nozzle communicated with the main inlet and disposed at an lower end of the valve body, a circle-shaped barrier is protruded at an inner side of the double gas nozzle, at least one in-circle nozzle mouth merely for the low calorific value gas to be emitted is provided in the circle-shaped barrier on the double gas nozzle, at least one outer nozzle mouth for the low calorific value gas or the high calorific value gas to be emitted is disposed between an outer periphery of the double gas nozzle and the circle-shaped barrier, the first main gas nozzle mouth is the outer nozzle mouth, and the second main gas nozzle mouth is the in-circle nozzle mouth, an inner gas transfer chamber for merely the low calorific value gas to enter and an outer gas transfer chamber surrounding an outer periphery of the inner gas transfer chamber for the low calorific value gas or the high calorific value gas to enter are respectively formed when the double gas nozzle and the valve body are connected, the inner gas transfer chamber is communicated with the in-circle nozzle mouth, and the outer gas transfer chamber is communicated with the outer nozzle mouth; a spool through hole assembly is disposed on the spool, two ends of the spool through hole assembly are respectively communicated with the inner gas transfer chamber and a low gas transfer channel communicated with the main inlet and disposed on the valve body in a sealed manner, and the low calorific value gas is introduced in or the high calorific value gas is prevented from entering the inner gas transfer chamber through rotation of the spool, so that an effective gas-intake cross-sectional area corresponding to requirement from the high and low calorific value gas on the double gas nozzle is adjusted.

In the dual-gas source gas control system with anti-gas source misconnection, wherein the spool through hole assembly includes a first spool hole axially disposed near an end of the double gas nozzle on the spool, the first spool hole is communicated with the inner gas transfer chamber in a sealed manner, a second spool hole communicating with the first spool hole is disposed at an outer side of the spool, the second spool hole is communicated with the low gas transfer channel in a sealed manner; the spool is tapered, the spool matches a size and a shape of a space in the valve body accommodating the spool, a low calorific value gas limitation groove and a high calorific value gas limitation groove are disposed in the valve seat in a high and low manner and in a misaligned arrangement, a boss is disposed on the valve rod, the valve rod downwardly moves so that the valve rod passes the connection rotation shaft to drive the spool to rotate to switch the ignition device gas paths between the high and low calorific value gas, the boss is engaged in a corresponding limitation groove so that the valve rod is positioned; the connection groove has a sector structure with an angle of 180 degrees, the low calorific value gas lighter outlet and the gas lighter gas path inlet are located on a same center line, a center line of the high calorific value gas lighter outlet and a center line of the low calorific value gas lighter outlet are in a same plane; a damper regulation structure for regulating gas intake in a gas main tube is disposed between an outer end of the double gas nozzle and the gas main tube connected to an outer portion of the main burner, and one end of the damper regulation structure is connected to an outer end of the valve rod.

In the dual-gas source gas control system with anti-gas source misconnection, wherein a first connection short tube is disposed between the circle-shaped barrier and the valve body in a sealed manner for transferring the low calorific value gas; the double gas nozzle and the circle-shaped barrier are integrally connected in one piece; the damper regulation structure includes a second connection short tube disposed between the main burner and the external gas main tube in a sealed manner, a first damper for air to enter is disposed at one side of the second connection short tube, a rotation barrel having a size and a shape matched with that of the second connection short tube is disposed at an outer periphery of the second connection short tube, a second damper corresponding to the first damper is disposed on the rotation barrel, a damper linking rod capable of driving the rotation barrel and the valve rod to simultaneously rotate is disposed between the rotation barrel and the valve rod; at least a pair of axial limitation ribs for limiting the rotation barrel to move in an axial direction of the second connection short tube protrudes from an outer side of the second connection short tube; connection between the damper linking rod and the rotation barrel and connection between the damper linking rod and the valve rod are detachable; a knob is disposed at an outer end of the valve rod, and the knob is connected to the damper linking rod.

In the dual-gas source gas control system with anti-gas source misconnection, wherein the gas path conversion valve is an electronically controlled gas path conversion valve and includes a main gas channel switching solenoid valve respectively communicated with one input end communicating with the main gas path, one output end communicating with the first main gas nozzle mouth, and one output end communicating with the second main gas nozzle mouth, whether gas introduced from the input end is simultaneously introduced to the two output ends or is only introduced to one output end communicating with the first main gas nozzle mouth is determined according to a gas calorific value, an ignition gas channel switching solenoid valve is further provided and is communicated with one input end communicating with the ignition gas path, one output end communicating with the low calorific value ignition gas path, and one output end communicating with the high calorific value ignition gas path, whether gas introduced from the input end is introduced to one output end communicating with the low calorific value ignition gas path or is introduced to one output end communicating with the high calorific value ignition gas path is determined according to a gas calorific value; each of the low calorific value voltage regulator valve and the high calorific value voltage regulator valve is a switch voltage regulator valve for switching, the low calorific value voltage regulator valve includes a low calorific value voltage regulator switching switch, and the high calorific value voltage regulator valve includes a high calorific value voltage regulator switching switch.

Another dual-gas source gas control system with anti-gas source misconnection includes a low calorific value voltage regulator valve and a high calorific value voltage regulator valve. An input end and an output end of the low calorific value voltage regulator valve are respectively connected to a low calorific value gas path configured for transmitting a low calorific gas source, and an input end and an output end of the high calorific value voltage regulator valve are respectively connected to a high calorific value gas path configured for transmitting a high calorific gas source; a switch control valve, acting as a master switch configured for controlling a gas path to be cut off, provided with a first solenoid valve configured for controlling the switch control valve to be turned on or turned off, including two input ends, wherein one of the input ends is connected to the low calorific value voltage regulator valve through the low calorific value gas path, and the other one of the input ends is connected the high calorific value voltage regulator valve through the high calorific value gas path, and further includes two output ends, respectively connected to a main gas path and an ignition gas path one by one. A gas path conversion valve includes two input ends, wherein one of the input ends is connected to the output end of the switch control valve communicating with the main gas path, and the other one of the input ends is connected to the output end of the switch control valve communicating with the ignition gas path, and further includes four output ends, wherein the four output ends are respectively communicated with a low calorific value ignition gas path leading to a low calorific value gas ignition device, a high calorific value ignition gas path leading to a high calorific value gas ignition device, and a first main gas nozzle mouth and a second main gas nozzle mouth leading to a main burner one by one, and further includes a high calorific value gas internal path, a low calorific value gas internal path and a knob or a switch configured for switching between the high calorific value gas internal path and the low calorific value gas internal path, wherein the low calorific value gas internal path is respectively communicated with low calorific value ignition gas path, the first main gas nozzle mouth, and a second main gas nozzle mouth, and the high calorific value gas internal path is respectively communicated with the high calorific value ignition gas path and the first main gas nozzle mouth. The main burner, wherein an input end thereof are disposed corresponding to the first main gas nozzle mouth and the second main gas nozzle mouth on the gas path conversion valve, so that gas emitted from the first main gas nozzle mouth and the second main gas nozzle mouth directly enters the input end of the main burner, and a burner opening required by high calorific value gas and low calorific value gas to burn normally is disposed at an outer side of the main burner. The low calorific value gas ignition device, including a low calorific value gas lighter near the burner opening required for burning of the low calorific value gas on the main burner, a low calorific value gas ignition needle and a low calorific value gas thermocouple disposed adjacent to the low calorific value gas lighter, wherein the low calorific value gas lighter is connected to a corresponding output end on the gas path conversion valve through the low calorific value ignition gas path; the high calorific value gas ignition device includes a high calorific value gas lighter near the burner opening required for burning of the high calorific value gas on the main burner and a high calorific value gas ignition needle and a high calorific value gas thermocouple disposed adjacent to the high calorific value gas lighter, wherein the high calorific value gas lighter is connected to a corresponding output end on the gas path conversion valve through the high calorific value ignition gas path. An igniter is electrically connected to the low calorific value gas ignition needle and the high calorific value gas ignition needle respectively. The system further includes a flame sensor disposed at one side near the low calorific value gas thermocouple and away from the low calorific value gas lighter, and configured for detecting a flame signal; wherein the igniter further includes a power supply and an error-proof control circuit electrically connected thereto, the error-proof control circuit is the control circuit electrically connected to the flame sensor, after an igniter switch on the igniter is pressed, electricity provided by the power supply is transmitted to the connected control circuit, and the control circuit begins to function and receive the flame signal sent from the flame sensor; wherein an anode of the low calorific value gas thermocouple is connected to an anode of the high calorific value gas thermocouple, a cathode of the low calorific value gas thermocouple and a cathode of the high calorific value gas thermocouple are connected to form a thermocouple parallel circuit, an anode and a cathode of the thermocouple parallel circuit are electrically connected to an anode and a cathode of the first solenoid valve respectively one by one, the low calorific value gas thermocouple generates an electric potential after being burned by ignited gas, so as to continuously supply power to the first solenoid valve in the switch control valve, so that the first solenoid valve stays in a closed state and the gas path is in a turned on state; an on/off valve disposed on the low calorific value ignition gas path between output ends corresponding to the low calorific value gas lighter on the low calorific value gas lighter and the gas path conversion valve, including a second solenoid valve configured for controlling connection and cutting off of the low calorific value ignition gas path, wherein an anode and a cathode of the second solenoid valve are electrically connected to an anode output level and a cathode output level on the control circuit one by one, when the control circuit detects the flame signal from the flame sensor indicating that the high calorific value gas is misconnected to the low calorific value gas lighter, electrical levels outputted from the anode output level and the cathode output level are both zero, the second solenoid valve on the on/off valve is not closed to prevent gas in the low calorific value ignition gas path from entering the low calorific value gas lighter, a gas flame is reduced until being put out without burning the low calorific value gas thermocouple, such that the low calorific value gas thermocouple cannot continuously supply power to the first solenoid valve in the switch control valve, and the first solenoid valve in the switch control valve without receiving power supply on the switch control valve is not closed to prevent external gas from entering the gas path in the system through the switch control valve.

In the another dual-gas source gas control system with anti-gas source misconnection, wherein an over voltage protection device is disposed on the low calorific value ignition gas path between the output ends corresponding to the low calorific value gas lighter on the low calorific value gas lighter and the gas path conversion valve. When the high calorific value gas is mistakenly introduced to the low calorific value gas lighter after passing through the high calorific value voltage regulator valve, or when the low calorific value gas is mistakenly passes through the high calorific value gas voltage regulator valve and is introduced to the low calorific value gas lighter, since the pressure of the gas in the low calorific value ignition gas path exceeds a pressure preset by the over voltage protection device, the over voltage protection device automatically closes the gas path at this moment.

In the another dual-gas source gas control system with anti-gas source misconnection, wherein the gas path conversion valve is a manual gas path conversion valve and includes a valve body, an outer periphery of the valve body is provided with an internally-communicated low calorific value gas lighter outlet, a high calorific value gas lighter outlet, a gas lighter gas path inlet, and a main inlet; a spool is provided and is disposed in the valve body, a connection groove is disposed on an outer periphery thereof, the spool rotates so that the connection groove is communicated with the low calorific value gas lighter outlet and the gas lighter gas path inlet or is communicated with the high calorific value gas lighter outlet and the gas lighter gas path inlet; a valve seat is provided and is disposed on an upper end of the valve body, a valve rod is slidably inserted into the valve seat, an upper end of the valve rod exposes out of the valve seat, a lower end of the valve rod is loosely connected to the other end of a connection rotation shaft with one end disposed on the spool, the connection rotation shaft is sleeved with a reset spring for resetting the valve rod after operation. The gas path conversion valve further includes a double gas nozzle communicated with the main inlet and disposed at an lower end of the valve body, a circle-shaped barrier is protruded at an inner side of the double gas nozzle, at least one in-circle nozzle mouth for the low calorific value gas to be emitted is provided in the circle-shaped barrier on the double gas nozzle, at least one outer nozzle mouth for the low calorific value gas or the high calorific value gas to be emitted is disposed between an outer periphery of the double gas nozzle and the circle-shaped barrier, the first main gas nozzle mouth is the outer nozzle mouth), and the second main gas nozzle mouth is the in-circle nozzle mouth, an inner gas transfer chamber for merely the low calorific value gas to enter and an outer gas transfer chamber surrounding an outer periphery of the inner gas transfer chamber for the low calorific value gas or the high calorific value gas to enter are respectively formed when the double gas nozzle and the valve body are connected, the inner gas transfer chamber is communicated with the in-circle nozzle mouth, and the outer gas transfer chamber is communicated with the outer nozzle mouth; a spool through hole assembly is disposed on the spool, two ends of the spool through hole assembly are respectively communicated with the inner gas transfer chamber and a low gas transfer channel connected to the main inlet and disposed on the valve body in a sealed manner, and the low calorific value gas is introduced in or the high calorific value gas is prevented from entering the inner gas transfer chamber through rotation of the spool, so that an effective gas-intake cross-sectional area corresponding to requirement from the high and low calorific value gas on the double gas nozzle is adjusted.

In the another dual-gas source gas control system with anti-gas source misconnection, wherein the spool through hole assembly includes a first spool hole axially disposed near an end of the double gas nozzle on the spool, the first spool hole is communicated with the inner gas transfer chamber in a sealed manner, a second spool hole communicated with the first spool hole is disposed at an outer side of the spool, the second spool hole is communicated with the low gas transfer channel in a sealed manner; the spool is tapered, the spool matches a size and a shape of a space in the valve body accommodating the spool, a low calorific value gas limitation groove and a high calorific value gas limitation groove are disposed in the valve seat in a high and low manner and in a misaligned arrangement, a boss is disposed on the valve rod, the valve rod downwardly moves so that the valve rod passes the connection rotation shaft to drive the spool to rotate to switch the ignition device gas paths between the high and low calorific value gas, the boss is engaged in a corresponding limitation groove so that the valve rod is positioned; the connection groove has a sector structure with an angle of 180 degrees, the low calorific value gas lighter outlet and the gas lighter gas path inlet are located on a same center line, a center line of the high calorific value gas lighter outlet and a center line of the low calorific value gas lighter outlet are in a same plane; a damper regulation structure is disposed between an outer end of the double gas nozzle and a gas main tube connected to an outer portion of the main burner for regulating gas intake in the gas main tube, and one end of the damper regulation structure is connected to an outer end of the valve rod.

In the another dual-gas source gas control system with anti-gas source misconnection, wherein a first connection short tube is disposed between the circle-shaped barrier and the valve body in a sealed manner for transferring the low calorific value gas; the double gas nozzle and the circle-shaped barrier are integrally connected in one piece; the damper regulation structure includes a second connection short tube disposed between the main burner and the external gas main tube in a sealed manner, a first damper for air to enter is disposed at one side of the second connection short tube, a rotation barrel having a size and a shape matched with that of the second connection short tube is disposed at an outer periphery of the second connection short tube, a second damper corresponding to the first damper is disposed on the rotation barrel, a damper linking rod capable of driving the rotation barrel and the valve rod to simultaneously rotate is disposed between the rotation barrel and the valve rod; at least a pair of axial limitation ribs for limiting the rotation barrel to move in an axial direction of the second connection short tube protrudes from an outer side of the second connection short tube; connection between the damper linking rod and the rotation barrel and connection between the damper linking rod and the valve rod are detachable; a knob is disposed at an outer end of the valve rod, and the knob is connected to the damper linking rods.

In the another dual-gas source gas control system with anti-gas source misconnection, wherein the gas path conversion valve is an electronically controlled gas path conversion valve and includes a main gas channel switching solenoid valve respectively communicated with one input end communicating with the main gas path, one output end communicating with the first main gas nozzle mouth, and one output end communicating with the second main gas nozzle mouth, whether gas introduced from the input end is simultaneously introduced to the two output ends or is only introduced to one output end communicating with the first main gas nozzle mouth is determined according to a gas calorific value, an ignition gas channel switching solenoid valve is further provided and is communicated with one input end communicating with the ignition gas path, one output end communicating with the low calorific value ignition gas path, and one output end communicating with the high calorific value ignition gas path, whether gas introduced from the input end is introduced to one output end communicating with the low calorific value ignition gas path or is introduced to one output end communicating with the high calorific value ignition gas path is determined according to a gas calorific value; each of the low calorific value voltage regulator valve and the high calorific value voltage regulator valve is a switch voltage regulator valve for switching, the low calorific value voltage regulator valve includes a low calorific value voltage regulator switching switch, and the high calorific value voltage regulator valve includes a high calorific value voltage regulator switching switch.

Compared to the related art, advantages of the dual-gas source gas control system with anti-gas source misconnection and the control circuit thereof lie in that: when the high calorific value gas is misconnected to the low calorific value voltage regulator valve, a voltage of opposite polarity to an output voltage of the thermocouple parallel circuit is outputted through the control circuit, so that current balancing is instantly and forcibly performed to a thermoelectric potential generated by the fired low calorific value gas thermocouple or the voltage is set to zero, alternatively, the second solenoid valve which is being closed on the on/off valve is controlled to be detached through the control circuit, so that the total gas paths are closed. An over voltage protection device is provided, so when the high calorific value gas is mistakenly introduced to the low calorific value gas lighter after passing through the high calorific value voltage regulator valve, or when the low calorific value gas is mistakenly passes through the high calorific value gas voltage regulator valve and is introduced to the low calorific value gas lighter, since the pressure of the gas in the low calorific value ignition gas path exceeds a pressure preset by the over voltage protection device, the over voltage protection device automatically closes the gas path at this moment, and safety, protection, and control are achieved.

In the drawings, low calorific value voltage regulator valve101, high calorific value voltage regulator valve102, low calorific value gas path103, high calorific value gas path104, switch control valve105, first solenoid valve106, main burner107, main gas path108, first main gas nozzle mouth108a, second main gas nozzle mouth108b, ignition gas path109, low calorific value ignition gas path109a, high calorific value ignition gas path109b, low calorific value gas lighter111, low calorific value gas ignition needle112, low calorific value gas thermocouple113, high calorific value gas lighter114, high calorific value gas ignition needle115, high calorific value gas thermocouple116, igniter117, flame sensor118, a power supply119, igniter switch120, an over voltage protection device121, on/off valve122, second solenoid valve123, error-proof control circuit200, power-on circuit201, boost circuit202, alarm circuit203, first valve driving chip204, second valve driving chip205, gas path conversion valve3, valve body31, low calorific value gas lighter outlet3101, high calorific value gas lighter outlet3102, gas lighter gas path inlet3103, main inlet3104, low gas transfer channel3105, a spool32, connection groove3201, first spool hole3202, second spool hole3203, valve seat33, valve rod34, reset spring36, double gas nozzle37, circle-shaped barrier3701, in-circle nozzle mouth3702, outer nozzle mouth3703, inner gas transfer chamber38, outer gas transfer chamber39, first connection short tube310, second connection short tube31101, first damper31102, rotation barrel31103, second damper31104, damper linking rod31105, axial limitation rib31106, knob312, main gas channel switching solenoid valve401, ignition gas channel switching solenoid valve402.

DESCRIPTION OF THE EMBODIMENTS

The disclosure is described in detail in combination with the drawings and through the embodiments as follows. The following embodiments are explanations of the disclosure, and the disclosure is not limited to the following embodiments.

Manual operation is required by gas connection and selection of a gas path conversion valve3. The following types of misconnection leading to security risks may thereby exist. In the first misconnection type, high calorific value gas is misconnected to a low calorific value voltage regulator valve101, mistakenly enters a low calorific value lighter111, and then enters a first main gas nozzle mouth108aand a second main gas nozzle mouth108bin a main gas path108. In the second misconnection type, the high calorific value gas is connected to a high calorific value voltage regulator valve102, mistakenly enters the low calorific value lighter111, and then enters the first main gas nozzle mouth108aand the second main gas nozzle mouth108bin the main gas path108. In the third misconnection type, low calorific value gas is misconnected to the high calorific value voltage regulator valve102, enters the low calorific value lighter111, and then enters the first main gas nozzle mouth108aand the second main gas nozzle mouth108bin the main gas path108.

As shown inFIG. 11, a control circuit provided by the disclosure includes a power-on circuit201, connected in series with an external power supply119and an igniter switch120to form a loop. A self-locking switch triode T1connected in series with the external power supply119and a self-locking amplifying triode Q1connected to a base electrode of the self-locking switch triode T1are included. On an MCU control circuit, one pin on an MCU control chip U2is configured to detect whether the power-on circuit201is connected, and another pin on the MCU control chip is connected to a base electrode of the self-locking amplifying triode Q1in the power-on circuit201. Preferably, the control circuit further includes a boost circuit202connected to the power-on circuit201and including a boost chip U1and an inductor L1. A power output pin of the boost chip U1transmit a boosted voltage to any one or a plurality of the MCU control circuit, a pulse ignition circuit, and a gas misconnection flame detection circuit. The operating principle is that when an igniter switch120is pressed, a switch S1is switched off, and power is turned on. The power supply119herein is battery powered. An anode BAT+ of the battery reaches a front end of a boost circuit b of the AP point through the switch S1and D1. C3, L1, D2, U1, R17, R18, and C18form a boost voltage VCC1, and a boosted voltage powers the MCU control chip U2through R16, that is, passing through a VCC end. MCU control chip U2is powered on, after a signal Lswicth of pin1becomes a high electrical level, a 13thpin sends a high electrical level signal powerlatch to a b electrode of pin1of Q1through R3to drive Q1to be turned on. After Q1is turned on, pin3becomes a low potential from a high potential, and T1gate G passes through R2and becomes a low potential. T1is turned on, a battery voltage BAT+ reaches the boost circuit b through T1, the circuit is activated to form activation and perform self-locking. R3, C1, R4, Q1, R2, R1, and T1form a self-locking circuit. Arrangement of the booster circuit202improves the voltage supply capability to other circuits in the control circuit. Besides, J1inFIG. 11is the connection terminal of the power-on circuit201and the MCU control circuit.

As shown inFIG. 14, when a gas path conversion valve3is manually operated, the MCU control circuit includes the MCU control chip U2. Pins of the MCU control chip U2are introduced as follows. Pin1is a Lswitch IO input pin and may be used to detect whether a system is powered on. Pin2is configured for LfireIN floating and does not provide any other functions. Pin3is an L IO input pin and may be used to determine whether gas is misconnected. Pin4is a LightHV IO output pin and is configured to control activation and termination of electronic pulse ignition. Pin5is an AD input pin and is configured to detect battery power when a system is powered on. Pin6P53SCL and pin7P52SDA are MCU burning signal pins. Pin8VCC and pin9GND are MCU anode and cathode power supply pins. Pin10Mag− and pin11Mag+ are IO output pins and are configured to control close/open of a second solenoid valve123on the on/off valve122. Pin12is an MCU power-on reset pin Reset. Pin13PowerLatch is an IO output pin and controls power-on self-locking and powering off of a system. Pin14BUZZER is an IO output pin and controls activation/termination of a buzzer. Pin15PWML is an IO output pin and controls turning off of a first solenoid valve106on a switch control valve105. Pin16is floating and does not provide any other functions. In addition, JP1inFIG. 14is a program burning port and thus may be used to read a control code in the MCU control chip U2and may also be used to write a new control code into the MCU control chip U2.

As shown inFIG. 17, when the gas path conversion valve3is electrically controlled, the MCU control circuit includes the MCU control chip U2. Pins of the MCU control chip U2are introduced as follows. Pin1is a Lswitch IO input pin and may be used to detect whether a system is powered on. Pin2detects whether a switch S2is connected. Pin3is an L IO input pin and may be used to determine whether gas is misconnected. Pin4is a LightHV IO output pin and is configured to control activation and termination of electronic pulse ignition. Pin5is an AD input pin and is configured to detect battery power when a system is powered on. Pin6LPMag+ and pin7LPMag− control close/open of a lighter solenoid valve. Pin8P53SCL and pin9P52SDA are MCU burning signal pins. Pin10VCC and pin11GND are MCU anode and cathode power supply pins. Pin12NGMag− and pin13NGMag+ are IO output pins and are configured to control close/open of a master lighter solenoid valve. Pin14is an MCU power-on reset pin Reset. Pin15Mag+ and pin16Mag− are IO output pins and are configured to control close/open of the on/off valve. Pin17PowerLatch is an IO output pin and controls power-on self-locking and powering off of a system. Pin18BUZZER is an IO output pin and controls activation/termination of a buzzer. Pin19PWML is an IO output pin and controls turning off of a solenoid valve in a switch control valve. Pin20detects whether a switch S3is connected. In addition, JP1inFIG. 17is a program burning port and thus may be used to read a control code in the MCU control chip U2and may also be used to write a new control code into the MCU control chip U2.

As shown inFIG. 12, a pulse ignition circuit includes an oscillating loop powered by the power-on circuit201, and preferably powered by the boost circuit202. The oscillating loop generates an inducted ignition high pressure and discharges to an outside through an external low calorific value gas ignition needle112and a high calorific value gas ignition needle115connected thereto. One pin on the MCU control chip U2sends a control signal to control magnitude of an oscillating voltage of the oscillating loop. A gas misconnection flame detection circuit includes a comparator IC2powered by the power-on circuit201, and preferably powered by the boost circuit202, and is configured for receiving a flame signal sent from an external flame sensor118. The comparator IC2is a chip having a model number of LM393. A voltage signal generated by the flame sensor118is transmitted to one input pin of the comparator IC2. The flame signal is outputted from an output pin of the comparator IC2to a base electrode of a detection amplifying triode Q3connected to the comparator IC2. The flame signal passing through the detection amplifying triode Q3is transmitted onto the MCU control chip U2through an input pin on the MCU control chip U2that is connected to the detection amplification triode Q3and that is configured for receiving the flame signal. When a high calorific value gas is misconnected to a low calorific value gas lighter111, the flame sensor118generates a negative voltage signal to the input pin configured for receiving the flame signal on the comparator IC2. The output pin configured for outputting the flame signal on the comparator IC2outputs a high electrical level to the base electrode of the detection amplifying triode Q3. The detection amplifying triode Q3transmits the amplified flame signal to the input pin configured for receiving the flame signal on the MCU control chip U2. After an output pin on the MCU control chipU2that is configured for sending a driving signal for driving a gas path to be cut off receives the flame signal indicating misconnection, the output pin sends the driving signal configured for driving the gas path to be cut off to an external corresponding gas path on/off control device. A cutting off operation of a first solenoid valve106in a switch control valve105is controlled by the gas path on/off control device. The operating principle is that the switch S1in the power-on circuit201is switched off, and the battery voltage BAT+ in the power-on circuit201passes through the switch S1and the diode D1and reaches the AP point. A voltage AP passes through Q6, C11, R29, DB1, D5, D6, C12, T2, R33, and R28and forms an oscillating loop. After the MCU control chip U2detects that a 1stpin has a high potential, a 4thpin transmits a high potential signal LightHV to detect that Q4is turned on to GND. A resistor R25and GND form a loop, the oscillating voltage rises, and a voltage of the oscillating voltage also increases after the oscillating voltage passes through the 1stpin of a transformer DB1and D5to charge a capacitor C12. When a charging voltage rises to a set voltage value, D6discharges GND instantly. After voltages across two ends of C12are discharged, charging and discharging begin again, and such cycle is performed sequentially. Pins1and3of a transformer T2form an alternating voltage, and pins2and4of the transformer T2generate the inducted ignition high pressure. Discharging to the outside is performed through X1and X2discharging needles, and the X1and X2herein are a low calorific value gas ignition needle112and a high calorific value gas ignition needle115. Gas is ignited. After gas is ignited, the flame burns a thermocouple. After the thermocouple generates a thermoelectric potential to maintain the solenoid valve of the switch control valve to be closed, the S1switch is released. When the first pin on the MCU control chip U2detects that the Lswitch becomes a low-level signal, the 4thpin on the MCU control chip U2outputs a LightHV low level signal. When Q4ends, an oscillating voltage of the oscillating circuit reduces, and X1and X2stop discharging and igniting. After flame combustion on a lighter device is stabilized, if a flame sensor Xa1, the Xa1provided herein is the flame sensor118, is burned by the flame, a 6thpin of IC2passes the induction pin Xa1and the ion flame and is connected to GND through R23, R30, and R32and generates a negative pressure. A 7thpin of IC2outputs a high-level signal Lfir to drive Q3to be turned on, and then the signal L becomes a high potential. When detecting that the signal L is of high potential, a 3rd pin on the MCU control chip U2determines that gas is misconnected. IC2, C10, R21, R22, R23, D4, C13, R30, R31, C14, R32, and Xa1form a flame detection circuit. Note that when the flame sensor Xa1senses fire, it means that misconnection is present, and if no fire is sensed, it means that there is no misconnection.

The control circuit detects the flame signal transmitted by the external flame sensor Xa1connected thereto through the gas misconnection flame detection circuit and sends the signal to the MCU control circuit. A driving signal configured for driving the gas path to be cut off to an external corresponding gas path on/off control device is sent from the MCU control circuit. In this way, when the high calorific value gas is misconnected to the low calorific value voltage regulator valve101, enters the low calorific value gas lighter, the low calorific value gas ignition needle112, the low calorific value gas thermocouple113, the high calorific value gas lighter114, the high calorific value gas ignition needle115, and high calorific value gas, and simultaneously enters the first main gas nozzle mouth108aand the second main gas nozzle mouth108b, the gas path is closed in time and safety and security are thus provided.

Specifically, as shown inFIG. 15, one output pin on the MCU control chip U2configured for transmitting the driving signal for driving the gas path to be cut off is disposed on a wire of opposite polarity to the output pin in two wires connected an external thermocouple parallel circuit and the external first solenoid valve106. The thermocouple parallel circuit is formed by a connection between an anode of a low calorific value gas thermocouple113and an anode of a high calorific value gas thermocouple116and a connection between a cathode of the low calorific value gas thermocouple113and a cathode of the high calorific value gas thermocouple116. When the input pin of the MCU control chipU2connected to the gas misconnection flame detection circuit detects that the high calorific value gas is misconnected to the low calorific value gas lighter111, the output pin on the MCU control chip U2outputs a voltage of polarity opposite to an output voltage of the thermocouple parallel circuit. In this way, current balancing is instantly and forcibly performed to a thermoelectric potential generated by the fired low calorific value gas thermocouple113or the voltage is set to zero. As such, the thermoelectric potential which keeps the first solenoid valve106on the switch control valve105to be closed is lost, and the first solenoid valve106is not closed to prevent external gas from entering. The operating principle is that when the MCU control chip U2detects that gas is misconnected, a 15thpin of the MCU control chip U2outputs a high-level signal PWML to turn on Q2through R6. A direct voltage AP flows to the thermocouple and a negative voltage end through R5and Q2, the a negative voltage generated by the thermocouple is offset to zero by the direct voltage AP, the first solenoid valve106in the switch control valve105has no voltage and thus is not closed, such that the gas path is not connected. When the high calorific value gas is misconnected to the low calorific value voltage regulator valve101, a voltage signal of opposite polarity to the thermocouple connected to the MCU control circuit is outputted through the MCU control circuit. In this way, current balancing is instantly and forcibly performed to a thermoelectric potential generated by the thermocouple or the voltage is set to zero. The thermoelectric potential which keeps the first solenoid valve106on the switch control valve105to be closed is lost to prevent external gas from entering the gas path of the system through the switch control valve105to achieve safety, prevention, and control.

Further, as shown inFIG. 16, a pair of anode and cathode power output pins configured for transmitting the driving signal for driving the gas path to be cut off on the MCU control chip U2is electrically connected to the external low calorific value gas lighter111and a second solenoid valve123in an on/off valve122on a low calorific value ignition gas path109abetween output ends corresponding to the low calorific value gas lighter111on a gas path conversion valve3through a motor control driver chip. When the input pin connected to the gas misconnection flame detection circuit on the MCU control chip U2detects that the high calorific value gas is misconnected to the low calorific value gas lighter111, the pair of anode and cathode power output pins transmits the driving signal for driving the gas path to be cut off, so that the second solenoid valve123on the on/off valve122is not closed to close the low calorific value ignition gas path109a. A gas flame is reduced until being put out without burning the low calorific value gas thermocouple113, such that the low calorific value gas thermocouple113cannot continuously supply power to the first solenoid valve106in the switch control valve105. The first solenoid valve106in the switch control valve105does not receive power supply is not closed to prevent external gas from entering the gas path in the system through the switch control valve105. The operating principle is that when the MCU control chip U2detects that gas is misconnected, a 10thpin Mag− and a 11thpin Mag+ of the MCU control chip U2send a valve off signal through R26and R27to control IC3to drive the on/off valve to be switched off, a gas channel is cut off, and the flame is put out. When the high calorific value gas is misconnected to the low calorific value voltage regulator valve101, a switching off signal is outputted to the second solenoid valve123on the on/off valve122connected to the MCU control circuit through the MCU control circuit, so that the second solenoid valve123in a closed state is instantly opened. The flame of the low calorific value gas lighter111may thus be extinguished since no low calorific value gas is continuously supplied. The thermocouple no longer generates a thermoelectric potential since no flame is sensed and thus may not provide electricity energy to the first solenoid valve106connected thereto on the switch control valve105. In this way, the first solenoid valve106is not closed to prevent external gas from entering the gas path in the system through the switch control valve105. When the high calorific value gas is misconnected to the low calorific value voltage regulator valve101, a switching off signal is outputted to the second solenoid valve123on the on/off valve122connected to the MCU control circuit through the MCU control circuit, so that the second solenoid valve123in the closed state is instantly opened. The flame of the low calorific value gas lighter111may thus be extinguished since no low calorific value gas is continuously supplied. The thermocouple no longer generates a thermoelectric potential since no flame is sensed and thus may not provide electricity energy to the first solenoid valve106connected thereto on the switch control valve105. In this way, the first solenoid valve106is not closed to prevent external gas from entering.

As shown inFIG. 13, an alarm circuit203including a buzzer and an alarm amplifying triode is also included. A base electrode of the alarm amplifying triode receives an alarm signal sent from an output pin on the MCU control chip U2. During operation, when an output signal BUZZER of the MCU control chip U2is of high potential, the signal passes R11and drives Q5to be turned on, a buzzer BK1passes Q5to the ground to form a loop, and a sound sounds. When the signal is of low electrical level, Q5is turned off, the loop of the buzzer BK1is switched off, and the sound stops. R11, C5, Q5, R19, and BK1form a buzzer driving control circuit. Arrangement of the alarm circuit203enables a user to obtain alarm information immediately, and total gas paths may be closed through a knob on the switch control valve105through manual operation.

As shown inFIG. 18, an electronically controlled conversion valve control circuit is also provided and includes a first valve driving chip204configured for driving a main gas channel switching solenoid valve401in an external electronically controlled gas path conversion valve and a second valve driving chip205configured for controlling and driving an ignition gas channel switching solenoid valve402in the external electronically controlled gas path conversion valve. The first valve driving chip204and the second valve driving chip205respectively receive valve control information sent from the MCU control chip. Two pins in the MCU control chip are respectively connected in series with a low calorific value voltage regulator switching switch S2in an external low calorific value voltage regulator valve101and a high calorific value voltage regulator switching switch S3in a high calorific value voltage regulator valve102. When receiving information on the low calorific value voltage regulator switching switch S2or the high calorific value voltage regulator switching switch S3being in a closed state, the MCU control chip sends the corresponding valve control information to the first valve driving chip204and the second valve driving chip205. Specifically, when a gas tube is connected to a mouth of the high calorific value gas voltage regulator valve102or the low calorific value gas voltage regulator valve, the low calorific value voltage regulator switching switch S2or the high calorific value voltage regulator switching switch S3is switched off. When a 2ndpin or a 20th pin of the MCU control chip detects that the signal LPswitch or NGswitch is changed to a low electrical level, the 6th, 7th, 12th, and 13thpins of the MCU control chip output control signals LPMag+, LPMag−, NGMag+, and NGMag− to control closing of the main gas channel switching solenoid valve401and the ignition gas channel switching solenoid valve402.

As shown inFIG. 1toFIG. 5, a dual-gas source gas control system with anti-gas source misconnection provided by the disclosure includes a low calorific value voltage regulator valve101and a high calorific value voltage regulator valve102. An input end and an output end of the low calorific value voltage regulator valve101are respectively communicated with a low calorific value gas path103configured for transmitting a low calorific gas source, and an input end and an output end of the high calorific value voltage regulator valve102are respectively communicated with a high calorific value gas path104configured for transmitting a high calorific gas source. A switch control valve105acting as a master switch configured for controlling a gas path to be cut off is provided and is provided with a first solenoid valve106configured for controlling the switch control valve105to be turned on or turned off. Two input ends are provided, wherein one input end is connected to the low calorific value voltage regulator valve101through the low calorific value gas path103, and the other input end is connected the high calorific value voltage regulator valve102through the high calorific value gas path. Two output ends are further provided and are respectively communicated with a main gas path108and an ignition gas path109one by one. A gas path conversion valve3includes two input ends, wherein one input end is connected to an output end communicating with the main gas path108on the switch control valve105, and the other input end is connected to an output end communicating with the ignition gas path109on the switch control valve105. Four output ends are further provided, wherein the four output ends are respectively communicated with a low calorific value ignition gas path109aleading to a low calorific value gas ignition device, a high calorific value ignition gas path109bleading to a high calorific value gas ignition device, and a first main gas nozzle mouth108aand a second main gas nozzle mouth108bleading to a main burner107one by one. A high calorific value gas internal path, a low calorific value gas internal path, and a knob or a switch configured for switching between the high calorific value gas internal path and the low calorific value gas internal path are further provided. The low calorific value gas internal path is respectively communicated with low calorific value ignition gas path109a, the first main gas nozzle mouth108aand a second main gas nozzle mouth108b, and the high calorific value gas internal path is respectively communicated with the high calorific value ignition gas path109band the first main gas nozzle mouth108a. The main burner107is provided, wherein an input end thereof are disposed corresponding to the first main gas nozzle mouth108aand the second main gas nozzle mouth108bon the gas path conversion valve3, so that gas emitted from the first main gas nozzle mouth108aand the second main gas nozzle mouth108bdirectly enters an input end of the main burner107, and a burner opening required by high calorific value gas and low calorific value gas to burn normally is disposed at an outer side. The low calorific value gas ignition device is provided and includes a low calorific value gas lighter111near the burner opening required for burning of the low calorific value gas on the main burner107and a low calorific value gas ignition needle112and a low calorific value gas thermocouple113disposed nearby. The low calorific value gas lighter111is connected to a corresponding output end on the gas path conversion valve3through the low calorific value ignition gas path109a. The high calorific value gas ignition device is provided and includes a high calorific value gas lighter114near the burner opening required for burning of the high calorific value gas on the main burner107and a high calorific value gas ignition needle115and a high calorific value gas thermocouple116disposed nearby. The high calorific value gas lighter114is connected to a corresponding output end on the gas path conversion valve3through the high calorific value ignition gas path109b. An igniter117is provided and is electrically connected to the low calorific value gas ignition needle112and the high calorific value gas ignition needle115respectively. Further, the system also includes a flame sensor118disposed at one side near the low calorific value gas thermocouple113and away from the low calorific value gas lighter111and is configured for detecting a flame signal. The igniter117is provided with a power supply119and an error-proof control circuit200electrically connected thereto. The error-proof control circuit200is the control circuit electrically connected to the flame sensor118. After an igniter switch120on the igniter117is pressed, electricity is transmitted to the connected control circuit, and the control circuit begins to function and receive the flame signal sent from the flame sensor118. An anode of the low calorific value gas thermocouple113is connected to an anode of the high calorific value gas thermocouple116, a cathode of the low calorific value gas thermocouple113and a cathode of the high calorific value gas thermocouple116are connected to form a thermocouple parallel circuit, and an anode and a cathode of the thermocouple parallel circuit are electrically connected to an anode and a cathode of the first solenoid valve106respectively one by one. One output end of the control circuit is disposed on one wire of opposite polarity to the output end in two wires connecting the thermocouple parallel circuit and the first solenoid valve106. When the control circuit detects the flame signal from the flame sensor118indicating that the high calorific value gas is misconnected to the low calorific value gas lighter111, the output end outputs a voltage of opposite polarity to an output voltage outputted by the thermocouple parallel circuit, so that current balancing is instantly and forcibly performed to a thermoelectric potential generated by the fired low calorific value gas thermocouple113or the voltage is set to zero. The first solenoid valve106which does not receive power supply on the switch control valve105is not closed to prevent external gas from entering the gas path in the system through the switch control valve105. When the high calorific value gas is misconnected to the low calorific value voltage regulator valve101, a voltage of opposite polarity to an output voltage of the thermocouple parallel circuit is outputted through the control circuit, so that current balancing is instantly and forcibly performed to a thermoelectric potential generated by the fired low calorific value gas thermocouple113or the voltage is set to zero to prevent external gas from entering.

Specifically, an over voltage protection device121is disposed on the low calorific value ignition gas path109abetween the output ends corresponding to the low calorific value gas lighter111on the low calorific value gas lighter111and the gas path conversion valve3. When the high calorific value gas is mistakenly introduced to the low calorific value gas lighter111after passing through the high calorific value voltage regulator valve102, or when the low calorific value gas is mistakenly passes through the high calorific value gas voltage regulator valve102and is introduced to the low calorific value gas lighter111, since the pressure of the gas in the low calorific value ignition gas path109aexceeds a pressure preset by the over voltage protection device121, the over voltage protection device121automatically closes the gas path at this moment, so no gas enters the low calorific value gas lighter111, and the system does not function.

As shown inFIG. 20toFIG. 30, when the gas path conversion valve3is a manual gas path conversion valve, a structure thereof includes a valve body31, a spool32and a valve seat33. An outer periphery of the valve body31is provided with an internally-communicated low calorific value gas lighter outlet3101, a high calorific value gas lighter outlet3102, a gas lighter gas path inlet3103, and a main inlet3104. The spool32is provided and is disposed in the valve body31, and a connection groove3201is disposed on an outer periphery thereof. The spool32rotates so that the connection groove3201is communicated with the low calorific value gas lighter outlet3101and the gas lighter gas path inlet3103or is communicated with the high calorific value gas lighter outlet3102and the gas lighter gas path inlet3103. The valve seat33is provided and is disposed on an upper end of the valve body31. A valve rod34is slidably inserted into the valve seat33, and an upper end of the valve rod34exposes out of the valve seat33. A lower end of the valve rod34is loosely connected to the other end of a connection rotation shaft having an end disposed on the spool32. The connection rotation shaft is sleeved with a reset spring for resetting the valve rod34after operation. The gas path conversion valve3further includes a double gas nozzle37communicated with the main inlet3104and disposed at a lower end of the valve body31. A circle-shaped barrier3701is protruded at an inner side of the double gas nozzle37, and at least one in-circle nozzle mouth3702for the low calorific value gas to be emitted is provided in the circle-shaped barrier3701on the double gas nozzle37. At least one outer nozzle mouth3703for the low calorific value gas or the high calorific value gas to be emitted is disposed between an outer periphery of the double gas nozzle37and the circle-shaped barrier3701. An inner gas transfer chamber38for merely the low calorific value gas to enter and an outer gas transfer chamber39surrounding an outer periphery thereof for the low calorific value gas and the high calorific value gas to enter are respectively formed when the double gas nozzle37and the valve body31are connected. The inner gas transfer chamber38is communicated with the in-circle nozzle mouth3702, and the outer gas transfer chamber39is communicated with the outer nozzle mouth3703. A spool through hole assembly is disposed on the spool32, and two ends of the spool through hole assembly are respectively communicated with the inner gas transfer chamber38and a low gas transfer channel3105communicated with the main inlet3104and disposed on the valve body31in a sealed manner. The low calorific value gas is introduced in or the high calorific value gas is prevented from entering the inner gas transfer chamber38through rotation of the spool32, so that an effective gas-intake cross-sectional area corresponding to requirement from the high and low calorific value gas on the double gas nozzle37is adjusted. Through the spool through hole assembly on the spool32, the low calorific value gas from the main inlet3104is introduced into the inner gas transfer chamber38, or the high calorific value gas from the main inlet3104is blocked outside the inner gas transfer chamber38. In this way, the function achieved by a lower valve rod provided in the BACKGROUND section is accomplished, requirement for processing accuracy is lowered, the number of components is decreased, installation is performed easily, and a simple structure is provided so that mass production may be easily achieved.

Specifically, the spool through hole assembly herein includes a first spool hole3202axially disposed near the end of the double gas nozzle37on the spool32. The first spool hole3202is communicated with the inner gas transfer chamber38in a sealed manner. A second spool hole3203communicated with the first spool hole3202is disposed at an outer side of the spool32, and the second spool hole3203is communicated with the low gas transfer channel3105in a sealed manner. A simple structure is thereby provided, and manufacturing may be conveniently performed. A first connection short tube310is disposed between the circle-shaped barrier3701and the valve body31herein in a sealed manner for transferring the low calorific value gas, so that transfer spaces of the inner gas transfer chamber38and the outer gas transfer chamber39are further increased. The double gas nozzle37and the circle-shaped barrier3701are integrally connected in one piece, so that operation may be performed more intensively. Further, a damper regulation structure is disposed between an outer end of the double gas nozzle37and a gas main tube b connected to an outer portion of the main burner107for regulating gas intake in the gas main tube b, and one end of the damper regulation structure is connected to an outer end of the valve rod34. In this way, in the damper regulation structure, when the valve rod34rotates for regulation, gas intake in the gas main tube b is controlled at the same time, and the demand for diverse flame colors from some products and users is satisfied as well. The damper regulation structure includes a second connection short tube31101disposed between the main burner107and the external gas main tube b in a sealed manner. A first damper31102for air to enter is disposed at one side of the second connection short tube31101, and a rotation barrel having a size and a shape matched with that of the second connection short tube31101is disposed at an outer periphery of the second connection short tube31101. A second damper31104corresponding to the first damper31102is disposed on the rotation barrel31103, and a damper linking rod31105capable of driving the rotation barrel31103and the valve rod34to simultaneously rotate is disposed between the rotation barrel31103and the valve rod34. At least a pair of axial limitation ribs31106for limiting the rotation barrel31103to move in an axial direction of the second connection short tube31101protrudes from an outer side of the second connection short tube31101, accuracy of control of air intake is further improved. Connection between the damper linking rod31105and the rotation barrel31103and connection between the damper linking rod31105and the valve rod34are detachable, so that installation and maintenance may be conveniently performed. A knob312is disposed at an outer end of the valve rod34, the knob312is connected to the damper linking rod31105, and arrangement of the knob312facilitate rotation and regulation performed by the valve rod34.

Further, the spool32is tapered, and the spool32matches a size and a shape of a space in the valve body31accommodating the spool32A low calorific value gas limitation groove and a high calorific value gas limitation groove are disposed in the valve seat33in a high and low manner and in a misaligned arrangement. A boss is disposed on the valve rod34, the valve rod34downwardly moves so that the valve rod34passes the connection rotation shaft to drive the spool32to rotate to switch the ignition device gas paths between the high and low calorific value gas. The boss is engaged in a corresponding limitation groove so that the valve rod34is positioned. A pressure limiting throttle13is disposed between the low calorific value gas lighter outlet3101and the external low calorific value gas ignition device c. The main function of the pressure limiting throttle13is to share part of the work of a dual-gas source gas lighting protection device. According to the principle of existence of a voltage difference between the high calorific value gas and the low calorific value gas, when operation is performed incorrectly, part of protection performed by the dual-gas source gas lighting protection device formed by the low calorific value gas ignition device c and the high calorific value gas ignition device d is transferred to the pressure limiting throttle13. In this way, design accuracy and manufacturing accuracy of the dual-gas source gas lighting protection device may be considerably reduced, and mass production may thereby be easily and conveniently performed. Theory and practice are thereby combined, and a perfect product is delivered to a customer. The connection groove3201herein has a sector structure with an angle of 180 degrees. The low calorific value gas lighter outlet3101and the gas lighter gas path inlet3103are located on a same center line, and a center line of the high calorific value gas lighter outlet3102and a center line of the low calorific value gas lighter outlet3101are in a same plane.

The operating principle of the manual gas path converter is that: The valve rod34is pressed and abuts against the connection rotation shaft, and the valve rod34then drives the connection rotation shaft connected to the spool32to rotate simultaneously. When the connection groove3201on the spool32is communicated with the low calorific value gas lighter outlet3101and the gas lighter gas path inlet3103, the second spool hole3203on the spool32is communicated with the low gas transfer channel3105. At this moment, one part of the low calorific value gas in the main inlet3104enters the inner gas transfer chamber38along the low gas transfer channel3105the second spool hole3203, and the first spool hole3202sequentially, passes through inner gas transfer chamber38, and is finally transmitted to the external gas main tube b from the in-circle nozzle mouth3702on the double gas nozzle37. At the same time, the other part of the low calorific value gas in the main inlet3104passes through the main inlet3104and directly enters the outer gas transfer chamber39, passes through the outer gas transfer chamber39, and is finally transmitted to the external gas main tube b from the outer nozzle mouth3703on the double gas nozzle37. In addition, the damper regulation structure which simultaneously rotates with the valve rod34is adjusted to be in an air intake inlet state required by the low calorific value gas. When the connection groove3201on the spool32is communicated with the high calorific value gas lighter outlet3102and the gas lighter gas path inlet3103, the second spool hole3203on the spool32is not communicated with the low gas transfer channel3105. The high calorific value gas in the main inlet3104passes through the main inlet3104and directly enters the outer gas transfer chamber39, passes through the outer gas transfer chamber39, and is finally transmitted to the external gas main tube b from the outer nozzle mouth3703on the double gas nozzle37. In addition, the damper regulation structure which simultaneously rotates with the valve rod34is adjusted to be in the air intake inlet state required by the high calorific value gas.

As shown inFIG. 19, when the gas path conversion valve3is an electronically controlled gas path conversion valve, a structure thereof includes a main gas channel switching solenoid valve401respectively communicated with one input end communicating with the main gas path108, one output end communicating with the first main gas nozzle mouth108a, and one output end communicating with the second main gas nozzle mouth108b. Whether gas introduced from the input end is simultaneously introduced to the two output ends or is only introduced to one output end communicating with the first main gas nozzle mouth108ais determined according to a gas calorific value. An ignition gas channel switching solenoid valve402is further provided and is communicated with one input end communicating with the ignition gas path109, one output end communicating with the low calorific value ignition gas path109a, and one output end communicating with the high calorific value ignition gas path109b. Whether gas introduced from the input end is introduced to one output end communicating with the low calorific value ignition gas path109aor is introduced to one output end communicating with the high calorific value ignition gas path109bis determined according to a gas calorific value. Each of the low calorific value voltage regulator valve101and the high calorific value voltage regulator valve102is a switch voltage regulator valve for switching. The low calorific value voltage regulator valve101includes a low calorific value voltage regulator switching switch S2, and the high calorific value voltage regulator valve102includes a high calorific value voltage regulator switching switch S3. In this way, the gas path conversion valve3may automatically achieve gas path conversion according to whether the low calorific value voltage regulator switching switch S2or the high calorific value voltage regulator switching switch S3is switched off. Gas path conversion is not required to be manually performed through manually rotating the knob312on the gas path conversion valve312when the system is installed, so that automation is improved, user may enjoy a convenient using experience, and errors caused by manual operation are also greatly reduced.

As shown inFIG. 6toFIG. 10, another dual-gas source gas control system with anti-gas source misconnection provided by the disclosure includes a low calorific value voltage regulator valve101and a high calorific value voltage regulator valve102. An input end and an output end of the low calorific value voltage regulator valve101are respectively communicated with a low calorific value gas path103configured for transmitting a low calorific gas source, and an input end and an output end of the high calorific value voltage regulator valve102are respectively communicated with a high calorific value gas path104configured for transmitting a high calorific gas source. A switch control valve105acting as a master switch configured for controlling a gas path to be cut off is provided and is provided with a first solenoid valve106configured for controlling the switch control valve105to be turned on or turned off. Two input ends are provided, wherein one input end is connected to the low calorific value voltage regulator valve101through the low calorific value gas path103, and the other input end is connected the high calorific value voltage regulator valve102through the high calorific value gas path. Two output ends are further provided and are respectively communicated with a main gas path108and an ignition gas path109one by one. A gas path conversion valve3includes two input ends are provided, wherein one input end is connected to an output end communicating with the main gas path108on the switch control valve105, and the other input end is connected to an output end communicating with the ignition gas path109on the switch control valve105. Four output ends are further provided, wherein the four output ends are respectively communicated with a low calorific value ignition gas path109aleading to a low calorific value gas ignition device, a high calorific value ignition gas path109bleading to a high calorific value gas ignition device, and a first main gas nozzle mouth108aand a second main gas nozzle mouth108bleading to a main burner107one by one. A high calorific value gas internal path, a low calorific value gas internal path, and a knob or a switch configured for switching between the high calorific value gas internal path and the low calorific value gas internal path are further provided. The low calorific value gas internal path is respectively communicated with low calorific value ignition gas path109a, the first main gas nozzle mouth108a, and a second main gas nozzle mouth108b, and the high calorific value gas internal path is respectively communicated with the high calorific value ignition gas path109band the first main gas nozzle mouth108a. The main burner107is provided, wherein an input end thereof are disposed corresponding to the first main gas nozzle mouth108aand the second main gas nozzle mouth108bon the gas path conversion valve3, so that gas emitted from the first main gas nozzle mouth108aand the second main gas nozzle mouth108bdirectly enters an input end of the main burner107, and a burner required by high calorific value gas and low calorific value gas to burn normally is disposed at an outer side. The low calorific value gas ignition device is provided and includes a low calorific value gas lighter111near the burner required for burning of the low calorific value gas on the main burner107and a low calorific value gas ignition needle112and a low calorific value gas thermocouple113disposed nearby. The low calorific value gas lighter111is connected to a corresponding output end on the gas path conversion valve3through the low calorific value ignition gas path109a. The high calorific value gas ignition device is provided and includes a high calorific value gas lighter114near the burner required for burning of the high calorific value gas on the main burner107and a high calorific value gas ignition needle115and a high calorific value gas thermocouple116disposed nearby. The high calorific value gas lighter114is connected to a corresponding output end on the gas path conversion valve3through the high calorific value ignition gas path109b. An igniter117is provided and is electrically connected to the low calorific value gas ignition needle112and the high calorific value gas ignition needle115respectively. Further, the system also includes a flame sensor118disposed at one side near the low calorific value gas thermocouple113and away from the low calorific value gas lighter111and is configured for detecting a flame signal. The igniter117further includes a power supply119and an error-proof control circuit200electrically connected thereto. The error-proof control circuit200is the control circuit according to any one of claims1to6. The control circuit is electrically connected to the flame sensor118. After an igniter switch120on the igniter117is pressed, electricity provided by the power supply119is transmitted to the connected control circuit, and the control circuit begins to function and receive the flame signal sent from the flame sensor118. An anode of the low calorific value gas thermocouple113is connected to an anode of the high calorific value gas thermocouple116, a cathode of the low calorific value gas thermocouple113and a cathode of the high calorific value gas thermocouple116are connected to form a thermocouple parallel circuit, and an anode and a cathode of the thermocouple parallel circuit are electrically connected to an anode and a cathode of the first solenoid valve106respectively one by one. The low calorific value gas thermocouple113generates an electric potential after being burned by ignited gas, so as to continuously supply power to the first solenoid valve106in the switch control valve105, so that the first solenoid valve106stays in a closed state and the gas path continues to be turned on. An on/off valve122is disposed on the low calorific value ignition gas path109abetween output ends corresponding to the low calorific value gas lighter111on the low calorific value gas lighter111and the gas path conversion valve3and includes a second solenoid valve123configured for controlling connection and cutting off of the low calorific value ignition gas path109a. An anode and a cathode of the second solenoid valve123are electrically connected to an anode output level and a cathode output level on the control circuit one by one. When the control circuit detects the flame signal from the flame sensor118indicating that the high calorific value gas is misconnected to the low calorific value gas lighter111, electrical levels outputted from the anode output level and the cathode output level are both zero. The second solenoid valve123on the on/off valve122is not closed to prevent gas in the low calorific value ignition gas path109afrom entering the low calorific value gas lighter111. A gas flame is reduced until being put out without burning the low calorific value gas thermocouple113, such that the low calorific value gas thermocouple113cannot continuously supply power to the first solenoid valve106in the switch control valve105. The first solenoid valve106which does not receive power supply on the switch control valve105is not closed to prevent external gas from entering the gas path in the system through the switch control valve105.

Specifically, an over voltage protection device121is disposed on the low calorific value ignition gas path109abetween the output ends corresponding to the low calorific value gas lighter111on the low calorific value gas lighter111and the gas path conversion valve3. When the high calorific value gas is mistakenly introduced to the low calorific value gas lighter111after passing through the high calorific value voltage regulator valve102, or when the low calorific value gas is mistakenly passes through the high calorific value gas voltage regulator valve102and is introduced to the low calorific value gas lighter111, since the pressure of the gas in the low calorific value ignition gas path109aexceeds a pressure preset by the over voltage protection device121, the over voltage protection device121automatically closes the gas path at this moment, so no gas enters the low calorific value gas lighter111, and the system does not function.

Further, the gas path conversion valve3herein may be a manual gas path conversion valve and may also be an electronically controlled gas path conversion valve. The specific structure is identical to the gas path conversion valve3in a dual-gas source gas control system with anti-gas source misconnection provided by the disclosure. When the gas path conversion valve3is an electronically controlled gas path conversion valve, each of the low calorific value voltage regulator valve101and the high calorific value voltage regulator valve102is required to be a switch voltage regulator valve for switching. That is, the low calorific value voltage regulator valve101is required to include a low calorific value voltage regulator switching switch S2, and the high calorific value voltage regulator valve102is required to include a high calorific value voltage regulator switching switch S3.

The specific embodiments described herein are merely illustrative of the spirit of the disclosure. A person of ordinary skill in the art may make various modifications or additions to the described specific embodiments or make replacement in a similar manner, but such modification should not depart from the spirit of the disclosure or go beyond the scope defined by the appended claims.

The following technical terms are used in the specification most of the time, including: the low calorific value voltage regulator valve101, the high calorific value voltage regulator valve102, the low calorific value gas path103, the high calorific value gas path104, the switch control valve105, the first solenoid valve106, the main burner107, the main gas path108, the first main gas nozzle mouth108a, the second main gas nozzle mouth108b, the ignition gas path109, the low calorific value ignition gas path109a, the high calorific value ignition gas path109b, the low calorific value gas lighter111, the low calorific value gas ignition needle112, the low calorific value gas thermocouple113, the high calorific value gas lighter114, the high calorific value gas ignition needle115, the high calorific value gas thermocouple116, the igniter117, the flame sensor118, the power supply119, the igniter switch120, the over voltage protection device121, the on/off valve122, the second solenoid valve123, the error-proof control circuit200, the power-on circuit201, the boost circuit202, the alarm circuit203, and the gas path conversion valve3. Other technical terms may also be used. These technical terms are used only to conveniently describe and explain the nature of the disclosure, and interpretation of the terms as any additional limitation is contrary to the spirit of the disclosure.