TWI708032B - Gas rapid ignition system of gas furnace - Google Patents

Abstract

The present invention provides gas rapid ignition system of a gas furnace. The system mainly includes a thermocouple, a gas valve, a main control unit, a low-voltage high-current circuit, and a fire detection circuit. The main control unit is electrically connected to the low-voltage high-current circuit and the fire detection circuit, and the main control unit can control the low-voltage high-current circuit to supply the gas valve when receiving the ignition trigger signal, and also can adjust the output of the low-voltage high-current circuit according to the feedback provided by the fire detection circuit, so that when the thermocouple supply current rises, the circuit supply current is correspondingly reduced.

Description

Gas stove rapid ignition system

The invention relates to a quick ignition system, in particular to a gas furnace quick ignition system.

In the current ignition method of gas stove, the user needs to keep pressing the gas ignition switch to keep the flame burning for 3 seconds, and then wait for the temperature of the thermocouple to come up. The power supply current output by the thermocouple is enough to reach the predetermined suction valve current value to make the single coil The gas solenoid valve sucks the valve, so the user must keep pressing the gas ignition switch with his hand for more than 3 seconds to achieve the current that the single-coil gas solenoid valve can suck the valve, and there is any looseness in the middle, the single-coil gas solenoid The valve will not open and the ignition will fail.

Therefore, in order to realize that the gas solenoid valve can still work immediately after letting go, some companies use the higher-cost dual-coil gas solenoid valve, that is, set up a set of secondary coils on the gas solenoid valve, and supply 100mA current to the gas solenoid valve by setting a DC3V battery. The auxiliary coil of the dual-coil gas solenoid valve is maintained by the auxiliary coil to maintain the starting state of the dual-coil gas solenoid valve. After 3 seconds, the battery power is disconnected and the auxiliary coil stops working. At this time, the thermocouple has generated a sufficiently high suction valve current. Maintain the normal operation of the dual-coil gas solenoid valve. However, by setting a DC3V battery to supply 100mA current, 0.3W power is required, which is quite power-consuming.

Therefore, the present invention overcomes the situation that the single-coil gas solenoid valve needs to be manually pressed for a long time during ignition, and the double-coil gas solenoid valve has a complicated structure design and high cost, and a DC3V battery is required to supply 100mA current, which causes energy waste and other problems. . The technical scheme of the present invention is to provide a rapid ignition system for a gas stove, which is structured in a gas stove and includes a thermocouple, a gas solenoid valve, and a main Control unit, low voltage high current circuit, and fire storage detection circuit; the output end of the thermocouple is connected to the input end of the gas solenoid valve, and the thermocouple can be heated to output a thermocouple power supply current to the gas solenoid valve; the low pressure The output terminal of the high-current loop is connected to the input terminal of the gas solenoid valve, the low-voltage high-current loop can be controlled to output a loop of power supply current to the gas solenoid valve; the fire storage detection loop is electrically connected to the output terminal of the thermocouple ; Wherein, the main control unit is electrically connected to the low-voltage high-current circuit and the fire storage detection circuit, and the main control unit can control the low-voltage high-current circuit to output the circuit power supply current to the circuit when receiving the ignition trigger signal The gas solenoid valve makes the gas solenoid valve perform a pre-suction valve, and adjusts the output of the low-voltage high-current circuit according to the state of the thermocouple power supply current detected by the fire storage detection circuit, so that when the thermocouple power supply current rises Correspondingly reduce the power supply current of this loop.

In a preferred embodiment, the gas solenoid valve is a single coil solenoid valve.

In a preferred embodiment, the output voltage of the low-voltage high-current loop is 30 mV and the maximum output current is 200 mA.

In a preferred embodiment, the gas stove rapid ignition system further comprises: an opening and closing control circuit; wherein the opening and closing control circuit is electrically connected between the input end of the gas solenoid valve and the main control unit, and the opening and closing control The circuit configuration is used to forcibly open and close the gas solenoid valve.

In a preferred embodiment, the gas stove rapid ignition system further includes: a temperature detection circuit and an air-fire sensor, the temperature detection circuit is electrically connected to the air-fire sensor and the main control unit At the same time, the temperature detection circuit can feed back the status of the air-burning sensor to the main control unit, and when the status of the air-burning sensor is abnormal, the main control unit forces the gas solenoid through the opening and closing control circuit. The valve shuts off the magnetic valve.

The beneficial effects of the present invention are at least that the gas stove rapid ignition system of the present invention is electrically connected to the low-voltage and high-current circuit and the fire-storage detection circuit through the main control unit, and the main control unit can control the low-voltage and high-current when receiving the ignition trigger signal The loop output loop power supply current is supplied to the gas solenoid valve to make the gas solenoid valve pre-suction valve, and based on the thermocouple power supply current detected by the fire storage detection circuit To adjust the output of the low-voltage and high-current loop, so that when the thermocouple power supply current rises, the loop power supply current is correspondingly reduced. Thereby, the present invention overcomes the need to manually press for a long time when the single-coil gas solenoid valve is ignited, while the double-coil gas solenoid valve has a complicated structure design and high cost, and requires a DC3V battery to supply 100mA current, which causes energy waste and other problems. situation.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings about the present invention. However, the provided drawings are only for reference and description, and are not used to limit the present invention.

100: Gas stove

101: burner

102: Ignition switch

1: Thermocouple

2: Gas solenoid valve

3: Low voltage and high current loop

4: Fire storage detection circuit

5: Main control unit

6: Open and close control loop

7: Temperature detection circuit

8: Empty burning sensor

Fig. 1 schematically illustrates the gas stove of the present invention.

Fig. 2 schematically illustrates the architecture of the gas stove rapid ignition system of the present invention.

Fig. 3 schematically illustrates the relationship between the loop power supply current of the present invention and the thermocouple power supply current.

The following are specific examples to illustrate the disclosed embodiments of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

Please refer to FIGS. 1, 2 and 3, the gas stove rapid ignition system provided by the embodiment of the present invention is constructed in a gas stove 100. It should be noted that the gas stove 100 shown in FIG. 1 is a two-burner stove with two burners 101, but it can also be a three-burner stove with three burners, it can also be a built-in stove or a countertop stove, or it can be A gas stove with a touch-sensitive ignition switch or a knob-type ignition switch 102 can be Appropriate changes are made according to actual design requirements, and there is no restriction. Of course, the gas stove 100 also includes other units or components, which will not be repeated here.

The following is a further example to illustrate the specific detailed features of this embodiment and the interaction between the units or circuits. It is particularly emphasized that the detailed features described below are only for the convenience of those skilled in the art. To easily understand the content of the present invention, the specific implementation method is not limited to this.

The gas stove rapid ignition system provided by the embodiment of the present invention basically includes a thermocouple 1, a gas solenoid valve 2, a low-voltage high-current circuit 3, a fire storage detection circuit 4, and a main control unit 5. In addition, the gas furnace quick ignition system provided by the embodiment of the present invention may further include an opening and closing control circuit 6, a temperature detection circuit 7, and an air-burning sensor 8.

The output end of the thermocouple 1 is connected to the input end of the gas solenoid valve 2 and the other end is grounded. The gas solenoid valve 2 of this example is a single coil gas solenoid valve. In addition, the thermocouple 1 can be arranged near the burner 101 (burner) of the gas stove 100. When the burner 101 of the gas stove 100 is ignited, the thermocouple 1 can be heated and output a thermocouple power supply current to the gas solenoid valve 2. And after the thermocouple 1 is heated by flame combustion for about 3 seconds, the thermocouple power supply current output by the thermocouple 1 is enough to reach the predetermined suction current value.

The output end of the low-voltage high-current loop 3 is connected to the input end of the gas solenoid valve 2. In addition, the low-voltage and high-current loop 3 can be controlled to output a loop of power supply current to the gas solenoid valve 2. Furthermore, the low-voltage and large-current loop 3 is also called a low-voltage and large-current source (power source), which can generate a low-voltage and large current and supply it to the gas solenoid valve 2. In practice, the low-voltage high-current loop 3 is mainly composed of a step-down circuit and a rectifier circuit, which can be various step-down and rectifier circuits, and its type is not limited here. In this embodiment, the output voltage of the low-voltage high-current loop 3 is 30 mV, and the maximum output current is 200 mA. In other words, the low-voltage and high-current circuit 3 can provide a large current to the gas solenoid valve 2 at a relatively low voltage as a 0-second pre-suction valve, and the power of the pre-suction valve is only 6mW, which is different from the previous 0-second pre-suction valve. The suction valve needs a DC3V battery to supply 100mA current to the gas solenoid valve for pre-suction valve, so 0.3W is required The power is quite power-hungry.

The fire storage detection circuit 4 is electrically connected to the output end of the thermocouple 1. In addition, when the low-voltage and large-current output circuit 3 supplies current to the gas solenoid valve 2 to suck the valve, the fire storage detection circuit 4 will detect the state of the supply current of the thermocouple 1 being supplied to the gas solenoid valve 2. Knowing circuit 4 detects that thermocouple 1 can generate current by itself, and the supply current of thermocouple 1 rises to the predetermined suction current value, so that the main control unit 5 knows that there is no need to continuously supply current through the low-voltage high-current loop 3 , So that the gas solenoid valve 2 can continuously suck the valve through the thermocouple 1 that has been on fire.

The main control unit 5 may include, for example, a microprocessor (MCU), or a digital signal processor (DSP) and other control chips and driving circuits, but it is not limited to this. The main control unit 5 is electrically connected to the low-voltage and high-current circuit 3 and the fire storage detection circuit 4, and the main control unit 5 can be used to control the low-voltage and high-current circuit 3 to output a large current of 200mA to supply the gas solenoid valve when an ignition trigger signal is received 2. To make the gas solenoid valve 2 suck the valve in 0 seconds, and adjust the output of the low-voltage high-current circuit 3 according to the state of the thermocouple power supply current detected by the fire storage detection circuit 4 to increase the power supply current of the thermocouple 1 Correspondingly, the output of the power supply current of the high current loop 3 is reduced (as shown in Figure 3).

The opening and closing control circuit 6 is electrically connected between the input end of the gas solenoid valve 2 and the main control unit 5. The opening and closing control circuit 6 performs a forced opening and closing operation on the gas solenoid valve 2. When the main control unit 5 finds any abnormality (empty burning abnormality or circuit abnormality, etc.), this circuit can be used to force the gas solenoid valve 2 to be magnetically shut off to terminate the gas combustion service, thereby improving the safety of the gas stove. In practice, the opening and closing control loop 6 can be mainly composed of an electromagnetic switch and a driving circuit. When the electromagnetic switch is driven to form a ground, the gas solenoid valve 2 is forcibly shut off and closed.

The temperature detecting circuit 7 is electrically connected between the air-burning sensor 8 and the main control unit 5. The temperature detection circuit 7 can feed back the state of the air-burning sensor 8 to the main control unit 5. When the state of the air-burning sensor 8 is abnormal, the main control unit 5 forces the gas solenoid valve 2 to be turned off through the opening and closing control circuit 6. The magnetic shut-off valve can improve the safety of the gas stove. In this embodiment, the empty burn sensor 8 can be used NTC thermistor, that is, the thermistor with negative temperature coefficient, the higher the temperature, the lower the resistance value. When the temperature exceeds the over-temperature point and grounding is formed, the state is abnormal. In addition, the number of the air-burning sensor 8 is not limited, and can be appropriately installed in the gas stove 100, for example, it can be installed in the vicinity of the head 101 of the gas stove 100 to contact the pot.

When the gas stove 100 is in use, the user operates the ignition switch 102 of the gas stove 100 to generate an ignition trigger signal to the main control unit 5. At this time, the main control unit 5 controls the low-voltage high-current loop 3 to output a large current of 200mA to supply the gas solenoid valve 2. The gas solenoid valve 2 is sucked for 0 seconds in advance, so that the gas solenoid valve 2 is kept open, so that the gas flows into the burner 101 of the gas stove 100 through the gas solenoid valve 2 for combustion, and at the same time, the fire detection The detection unit 4 will detect the status of the thermocouple power supply current. When it is detected that the thermocouple 1 is heated by the flame of the head 101 of the gas stove 100 to generate the thermocouple power supply current, the low-voltage high-current circuit 3 does not need to supply such If the current is large, the main control unit 5 can correspondingly reduce the output current of the low-voltage high-current circuit 3. After about 3 seconds, the thermocouple supply current will rise sharply to reach the predetermined suction current value, and the main control unit 5 can make the low-voltage high-current circuit The power provided by 3 drops immediately, so that the gas solenoid valve 2 can continuously suck the valve through the thermocouple 1 that has been on fire, so that the gas solenoid valve 2 continues to remain open.

In addition, when the gas stove 100 is in use, when the main control unit 5 finds any abnormality (empty burning abnormality or circuit abnormality, etc.), the gas solenoid valve 2 can be forcibly shut off and closed through the opening and closing control circuit 6 to terminate the gas combustion service, thereby improving The safety of the gas stove.

In summary, the gas stove rapid ignition system of the present invention is electrically connected to the low-voltage high-current circuit 3 and the fire storage detection circuit 4 through the main control unit 5, and the main control unit 5 can control the low voltage when the ignition trigger signal is received. The high-current loop 3 outputs the power supply current to the gas solenoid valve 2 so that the gas solenoid valve 2 performs the pre-suction valve, and adjusts the low-voltage large-current loop 3 according to the state of the thermocouple power supply current detected by the fire storage detection loop 4 Output so that when the thermocouple power supply current rises, the loop power supply current is reduced correspondingly. Thereby, the present invention overcomes the need for a long time when the single coil gas solenoid valve is ignited In addition, the double-coil gas solenoid valve has a complicated structure design and a high cost, and requires a DC3V battery to supply 100mA current, which causes energy waste and other problems.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of patent protection of the present invention. Therefore, all equivalent changes made by using the description and schematic contents of the present invention are included in the protection of the rights of the present invention. Within the scope, together to Chen Ming.

1: Thermocouple

2: Gas solenoid valve

3: Low voltage and high current loop

4: Fire storage detection circuit

5: Main control unit

6: Open and close control loop

7: Temperature detection circuit

8: Empty burning sensor

Claims (4)

A gas stove rapid ignition system, which is structured in a gas stove, includes: a thermocouple, a gas solenoid valve, a main control unit, a low-voltage high-current circuit, and a fire storage detection circuit; the output end of the thermocouple is connected to the gas solenoid valve At the input end, the thermocouple can be heated to output a thermocouple supply current to the gas solenoid valve; the output end of the low-voltage high-current loop is connected to the input end of the gas solenoid valve, and the low-voltage large-current loop can be controlled to output a loop Supply current to the gas solenoid valve; the fire storage detection circuit is electrically connected to the output end of the thermocouple, and can be used to detect the status of the thermocouple power supply current and feed it back to the main control unit; wherein the main control unit is electrically connected The low-voltage high-current circuit and the fire-storage detection circuit are sexually connected, and the main control unit can control the low-voltage high-current circuit to output the circuit power supply current to the gas solenoid valve when the ignition trigger signal is received, so that the gas solenoid valve Perform a pre-suction valve; wherein, when the main control unit receives the ignition trigger signal, it controls the output voltage of the low-voltage high-current loop to be 30mV, and the loop power supply current output is 200mA, and according to the thermocouple power supply current The rise correspondingly dynamically reduces the power supply current of the loop. As described in item 1 of the scope of patent application, the gas stove rapid ignition system, wherein the gas solenoid valve is a single coil solenoid valve. For example, the gas stove rapid ignition system described in item 1 of the scope of patent application further includes: an opening and closing control circuit; wherein the opening and closing control circuit is electrically connected between the input end of the gas solenoid valve and the main control unit, and the opening and closing control The circuit configuration is used to forcibly open and close the gas solenoid valve. For example, the gas stove rapid ignition system described in item 3 of the scope of patent application further includes: a temperature detection circuit and an air-burning sensor, the temperature detecting circuit is electrically connected to the air-burning sensor and the main control unit At the same time, the temperature detection circuit can feed back the status of the air-burning sensor to the main control unit, and when the status of the air-burning sensor is abnormal, the main control unit forces the gas solenoid through the opening and closing control circuit. The valve shuts off the magnetic valve.

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