TW202242315A - Gas rapid ignition control system of gas furnace - Google Patents

Abstract

The present invention provides a gas rapid ignition control system of a gas furnace. The system mainly includes a thermocouple, a gas valve, a main control circuit, a switch circuit, a low-voltage and high-current circuit, a fire detection circuit, a power supply unit, and a knob switch. The switch circuit is electrically connected between the thermocouple and the gas valve. The low-voltage and high-current circuit is electrically connected to the gas valve. The main control circuit is electrically connected to the switch circuit and the low-voltage and high-current circuit. The knob switch is electrically connected between the main control circuit and the power supply unit. The knob switch can be pressed to cause the power supply unit to supply power, so that the main control circuit controls the switch circuit from the off state to the on state, and controls the low-voltage high-current circuit to supply power to the gas valve in a predetermined power supply time and to stop supplying power after the predetermined power supply time, and forces the switch circuit from the on state to the off state after the cut-off time.

Description

Gas Furnace Rapid Ignition Control System

The invention relates to a rapid ignition control system, in particular to a rapid ignition control system for a gas furnace.

At present, the existing gas furnace ignition method requires the user to continuously press the gas ignition switch to make the flame burn for 3 seconds, and wait for the temperature of the thermocouple to rise, so that the power supply current output by the thermocouple is sufficient to reach the predetermined suction valve current value so that the single coil The gas solenoid valve sucks the valve, so the user must keep pressing the gas ignition switch for more than 3 seconds to achieve the current that enables the single-coil gas solenoid valve to suck the valve. If there is any loosening in the middle, the single-coil gas solenoid The valve would not open and the ignition would fail.

Therefore, in order to realize that the gas solenoid valve can still work immediately after letting go, some operators use a double-coil gas solenoid valve with high cost, that is, install an additional set of secondary coils on the gas solenoid valve, and supply 100mA current to the gas solenoid valve by setting a DC3V battery. The secondary coil of the double-coil gas solenoid valve is maintained by the secondary coil in the starting state of the double-coil gas solenoid valve. After 3 seconds, the battery power is disconnected, and the secondary coil stops working. At this time, the thermocouple has generated enough suction valve current to maintain The normal operation of the double coil gas solenoid valve. However, by setting the DC3V battery to supply 100mA current, it requires 0.3W of power, which is quite power consuming. Moreover, the structural design of the double-coil gas solenoid valve is complex and costly.

In view of this, the inventor has been engaged in the development and design of related products for many years, and felt that the above-mentioned defects can be improved, so he devoted himself to research and combined with the application of theories, and finally proposed an invention with a reasonable design and effective improvement of the above-mentioned defects.

The technical problem to be solved by the present invention is to provide a rapid ignition control system for a gas furnace in view of the shortcomings of the existing gas furnace ignition methods.

In order to solve the above-mentioned technical problems, the present invention provides a quick ignition control system for a gas furnace, which is based on a gas furnace and includes: a thermocouple, a single-coil solenoid valve, a main control circuit, a switch circuit, a low-voltage high-current circuit, and a fire storage detection system. loop, power supply unit, and knob press switch; the switch circuit is electrically connected between the output end of the thermocouple and the input end of the single-coil solenoid valve; the output end of the low-voltage high-current loop is electrically connected to the single-coil electromagnetic valve The input end of the valve; the fire storage detection circuit is electrically connected to the output end of the thermocouple; the main control circuit is electrically connected to the switch circuit, the low-voltage high-current circuit, and the fire storage detection circuit, and the knob is pressed The switch is electrically connected between the main control circuit and the power supply unit, and pressing the knob presses the switch to supply power to the power supply unit, so that the main control circuit controls the switch circuit to form an open state from an open state to an on state, and controls the The low-voltage high-current circuit outputs a circuit power supply current to maintain a predetermined power supply time to supply to the single-coil solenoid valve to make the single-coil solenoid valve perform a pre-suction valve and stop supplying the circuit power supply current to the single-coil solenoid valve after the predetermined power supply time , and control the switch circuit from the on state to the off state after a forced fire off time.

In a preferred embodiment, the output voltage of the low-voltage high-current loop is 30mV and the output current of the loop is 130mA.

In a preferred embodiment, the switch circuit is one of a relay switch and a semiconductor switch.

In a preferred embodiment, the power supply unit is a replaceable battery pack.

In a preferred embodiment, the main control circuit is further configured to detect the power of the power supply unit, and when detecting that the power of the power supply unit is weak, control a prompt to electrically connect the main control circuit The unit prompts a weak current message.

In a preferred embodiment, the prompt unit is one or a combination of a display screen, an LED light and a buzzer.

In a preferred embodiment, the switch circuit has a first switch and a second switch connected to each other, and are respectively electrically connected to the main control circuit.

In a preferred embodiment, the first switch is a relay switch, and the second switch is a semiconductor switch, and the switch circuit is formed from an open state to an open state by first making the second switch into an open state, and then making the second switch into an open state. The first switch forms an open state.

In a preferred embodiment, the rapid ignition control system of the gas furnace further includes: an on-off control loop. Wherein, the on-off control loop is electrically connected between the single-coil solenoid valve and the main control circuit, and the on-off control loop is configured to forcibly open and close the single-coil solenoid valve.

In a preferred embodiment, the gas furnace rapid ignition control system further includes: a temperature detection circuit. Wherein, the temperature detection circuit is electrically connected to the main control circuit, and the temperature detection circuit can feed back the detected temperature to the main control circuit, and when abnormal temperature is detected, the main control circuit will Force the single-coil solenoid valve to demagnetize and close the valve.

The beneficial effect of the present invention lies at least in that the rapid ignition control system of the gas furnace provided by the present invention is electrically connected between the output terminal of the thermocouple and the input terminal of the single-coil solenoid valve through the switch circuit, and the main control circuit is electrically connected with the switch circuit and The low-voltage high-current circuit, and the knob press switch is electrically connected between the main control circuit and the power supply unit, and the power supply unit is powered by pressing the knob press switch, so that the main control circuit controls the switch circuit from an open state to an open state, and Control the low-voltage high-current loop to output a loop power supply current to maintain a predetermined power supply time to supply to the single-coil solenoid valve to make the single-coil solenoid valve perform pre-suction valve and stop supplying the loop power supply current to the single-coil solenoid valve after the predetermined power supply time, and After a forced fire-off time, the control switch circuit is changed from the open state to the open state. Thereby, the present invention can achieve a 0-second pre-suction valve, and stop supplying current to the single-coil solenoid valve after a predetermined power supply time, so as to ensure that the thermocouple power supply current generated by the thermocouple can stably reach the predetermined suction valve current value, To stabilize the suction valve, and the main control circuit is configured to control the switch circuit from the open state to the open circuit state after the forced fire-off time, so as to perform forced fire-off, so that possible safety problems can be avoided in advance.

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

The following is an illustration of the disclosed embodiments of the present invention through specific specific examples, and 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 modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as "first" and "second" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are mainly used to distinguish one element from another. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

Please refer to FIGS. 1 and 2 , the present invention provides a rapid ignition control system for a gas furnace, which is based on a gas furnace 100 . It should be noted that the gas stove 100 shown in Fig. 1 is a two-port stove with two burners 101, but it can also be a three-port stove with three burners, or it can be a built-in stove or a countertop stove, depending on the actual design Appropriate changes according to needs, without limitation. Of course, the gas furnace 100 also includes other units or elements, which will not be described in detail here.

The specific detailed features of this embodiment and the interaction between each unit or circuit will be further illustrated below. It is emphasized again that the detailed features described below are only for the convenience of those skilled in the art. It is easy to understand the content of the present invention, and its specific implementation method is not limited thereto.

The rapid ignition control system of the gas furnace provided by the embodiment of the present invention basically includes a thermocouple 1, a single-coil solenoid valve 2, a main control circuit 3, a switch circuit 4, a low-voltage high-current circuit 5, a fire storage detection circuit 6, and a power supply Unit 7, and knob press switch 8. In addition, the gas furnace rapid ignition control system provided by the embodiment of the present invention may further include an on-off control circuit 9 , a temperature detection circuit 11 , and a prompt unit 12 .

The thermocouple 1 can be arranged near the burner head 101 (burner) of the gas furnace 100. When the burner head 101 of the gas furnace 100 is ignited, the thermocouple 1 can be heated and output a thermocouple power supply current. In addition, the switch circuit 4 is electrically connected between the output terminal of the thermocouple 1 and the input terminal of the single-coil solenoid valve 2. When the switch circuit 4 is in the open state, the thermocouple power supply current output by the thermocouple 1 can be supplied to the single-coil solenoid valve. valve 2. In this embodiment, the switch circuit 4 may be or may include a relay switch or a semiconductor switch. Moreover, low-impedance transmission can be achieved by using a relay switch or a semiconductor switch in combination with low-impedance wiring connected in series with the thermocouple 1 .

The output end of the low-voltage high-current circuit 5 is connected to the input end of the single-coil solenoid valve 2 . Moreover, the low-voltage high-current loop 5 can be controlled to output a loop supply current to the single-coil solenoid valve 2 . Furthermore, the low-voltage high-current loop 5 is called a low-voltage high-current source (power source), which can generate a low-voltage high-current supply to the single-coil solenoid valve 2 . In practice, the low-voltage high-current loop 5 is mainly composed of a step-down circuit and a rectification circuit, which can be various step-down and rectification circuits, and its type is not limited here. In this embodiment, the output voltage of the low-voltage high-current loop 5 is 30mV, and the maximum output current is 130mA. That is to say, the low-voltage high-current circuit 5 can provide a large current supply to the single-coil 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 3.9mW, which is different from the previous 0-second pre-suction valve. The second pre-suction valve needs DC3V battery to supply 100mA current to the solenoid valve for pre-suction valve, so it needs 0.3W power, which is quite power-consuming.

The main control circuit 3 may include control chips such as a microprocessor (MCU) or a digital signal processor (DSP), and a driving circuit, etc., but is not limited thereto. The main control circuit 3 is electrically connected to the switch circuit 4 , the low-voltage high-current circuit 5 , and the fire detection circuit 6 , and the knob press switch 8 is electrically connected between the main control circuit 3 and the power supply unit 7 . And, press the knob and switch 8 to make the power supply unit 7 supply power to the main control circuit 3, so that the main control circuit 3 controls the low-voltage high-current circuit 5 to output a large current of 130 mA for 8 seconds (predetermined power supply time) to supply to the single-coil solenoid valve 2 , so that the single-coil solenoid valve 2 performs a pre-suction valve, and the supply to the single-coil solenoid valve 2 is stopped after 8 seconds, and after the thermocouple 1 is heated by flame combustion for about 4 seconds (predetermined waiting time), the thermoelectric output of the thermocouple 1 The power supply current of the couple just reaches the predetermined suction valve current value, so it is set to stop the low-voltage high-current circuit 5 from supplying current to the single-coil solenoid valve 2 after 8 seconds, so as to ensure that the thermocouple power supply current output by the thermocouple 1 can reach the predetermined suction current stably. valve current value.

In this embodiment, the power supply unit 7 can be a replaceable battery pack. Moreover, the main control circuit 3 is further configured to detect the power of the power supply unit 7, and when it detects that the power of the power supply unit 7 is weak, it controls an electrically connected prompt unit 12 of the main control circuit 3 to prompt a The weak current message reminds the user to replace the power supply unit 7 in time. In this embodiment, the prompt unit 12 can be one or a combination of a display screen, an LED light, or a buzzer, and reminds the user to replace the power supply unit 7 in time by means of words, lights, or prompt sounds.

Moreover, if the user cannot replace the power supply unit 7 in time, so that the power supply unit 7 is out of power, or when the knob press switch 8 fails, the switch circuit 4 is formed into an open circuit state, so that the thermocouple supply current output by the thermocouple 1 It cannot be supplied to the single-coil solenoid valve 2 via wiring, so that the single-coil solenoid valve 2 is magnetically closed and the gas combustion service is terminated, thereby improving the safety of the gas stove.

In order to enhance safety, the main control circuit 3 is further configured to control the switch circuit 4 from the on-state to the off-circuit state after a forced fire-off time. At this time, the thermocouple power supply current generated by the thermocouple 1 cannot be supplied to the unit through wiring. The coil solenoid valve 2 makes the single-coil solenoid valve 2 turn off and close the valve to stop the gas combustion service, so as to further improve the safety of the gas stove. Further, the main control circuit 3 is configured to control the switch circuit 4 from the open state to the disconnected state after 30 minutes (forced fire-off time), so as to perform forced fire-off, so as to avoid possible safety problems in advance.

In addition, the on-off control circuit 9 is electrically connected between the single-coil solenoid valve 2 and the main control circuit 3 . The opening and closing control circuit 9 is used to directly perform forced opening and closing actions on the single coil solenoid valve 2 . When the main control circuit 3 finds any abnormality (abnormality of empty burning or circuit abnormality, etc.), this circuit can be used to force the single-coil solenoid valve 2 to be magnetically closed and the valve is closed to terminate the gas combustion service. In practice, the opening and closing control circuit 9 can be mainly composed of an electromagnetic switch and a driving circuit. When the electromagnetic switch is driven to form a ground, the single-coil electromagnetic valve 2 is forced to be closed.

The temperature detection circuit 11 is electrically connected to the main control circuit 3 . The temperature detection circuit 11 can feed back the detected temperature to the main control circuit 3. When an abnormal temperature is detected, the main control circuit 3 will forcibly turn off the magnetism of the single-coil solenoid valve 2 and close the valve through the opening and closing control circuit 9 to stop the gas Burning service. In this embodiment, the temperature detection circuit 11 may include an NTC thermistor, that is, a thermistor with a negative temperature coefficient. The higher the temperature, the lower the resistance value. Abnormal temperature. The number of the thermistors is not limited, and can be properly arranged in the gas stove 100 , for example, it can be arranged near the skull 101 of the gas stove 100 for contacting the pot.

In addition, in another embodiment, as shown in FIG. 3 , the switch circuit 4 has a connected first switch 41 and a second switch 42, which are electrically connected to the main control circuit 3 respectively. Therefore, only when the first switch 41 The thermocouple power supply current generated by the thermocouple 1 can be supplied to the single-coil solenoid valve 2 when both the second switch 42 and the second switch 42 are turned on, so as to perform the action of the suction valve. In this embodiment, the first switch 41 is a mechanical relay switch, and the second switch 42 is an electronic semiconductor switch, and in the main control circuit 3, the switch circuit 4 is to be formed into an off state from the on state, is First make the second switch 42 quickly form an open circuit state, and then make the first switch 41 form an open circuit state, so as to prevent the first switch 41 (mechanical relay switch) from generating sparks when the switch is switched, thereby improving the overall circuit stability.

When the gas stove 100 is in use, the user operates the knob of the gas stove 100 to press the switch 8, so that the power supply unit 7 supplies power to the main control circuit 3, and the main control circuit 3 controls the low-voltage high-current circuit 5 to output a large current of 130 mA to the single coil Solenoid valve 2, to carry out 0 second suction valve to single-coil solenoid valve 2 in advance, thereby keep single-coil solenoid valve 2 open state, make gas flow into burner head 101 of gas stove 100 through single-coil solenoid valve 2 and burn, in At the same time, the fire detection circuit 6 will detect the state of the thermocouple 1. When it is detected that the thermocouple 1 is heated by the flame of the head 101 of the gas furnace 100 to generate current, the current generated by the thermocouple 1 can be passed through the switch circuit. 4 supply to the single-coil solenoid valve 2, and stop the low-voltage high-current loop 5 from supplying current to the single-coil solenoid valve 2 after 8 seconds, so as to ensure that the current generated by the thermocouple 1 can stably reach the predetermined suction valve current value, so that the single-coil The coil solenoid valve 2 can continuously suck the valve through the ignited thermocouple 1, so that the single coil solenoid valve 2 continues to be kept open.

Based on the above, the gas furnace quick ignition control system provided by the present invention is electrically connected between the output end of the thermocouple 1 and the input end of the single coil solenoid valve 2 through the switch circuit 4, and the main control circuit 3 is electrically connected to the switch circuit 4 and the low-voltage high-current circuit 5, and the knob press switch 8 is electrically connected between the main control circuit 3 and the power supply unit 7, and the power supply unit 7 is powered by pressing the knob press switch 8, so that the main control circuit 3 controls the switch circuit 4. Form a circuit state from an open circuit state, and control the low-voltage high-current circuit 5 to output a circuit power supply current to maintain a predetermined power supply time to supply to the single-coil solenoid valve 2, so that the single-coil solenoid valve 2 performs a pre-suction valve, and at this predetermined power supply Stop supplying the loop power supply current to the single-coil solenoid valve 2 after a certain time, and control the switch circuit 4 from the on-state to the off-circuit state after a forced fire-off time. Thereby, the present invention can achieve a 0-second pre-suction valve, and stop supplying current to the single-coil solenoid valve after a predetermined power supply time, so as to ensure that the thermocouple power supply current generated by the thermocouple can stably reach the predetermined suction valve current value, To stabilize the suction valve, and the main control circuit is configured to control the switch circuit from the open state to the open circuit state after the forced fire-off time, so as to perform forced fire-off, so that possible safety problems can be avoided in advance.

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

100: gas stove 101: Stove head 1: Thermocouple 2: Single coil solenoid valve 3: Main control circuit 4: switch circuit 41: First switch 42: Second switch 5: Low voltage and high current circuit 6: Fire storage detection circuit 7: Power supply unit 8: Knob push switch 9: Open and close control loop 11: Temperature detection circuit 12: Prompt unit

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

Fig. 2 schematically shows a framework of the gas furnace rapid ignition control system of the present invention.

Fig. 3 schematically shows another architecture of the gas furnace rapid ignition control system of the present invention.

1: Thermocouple

2: Single coil solenoid valve

3: Main control circuit

4: switch circuit

5: Low voltage and high current circuit

6: Fire storage detection circuit

7: Power supply unit

8: Knob push switch

9: Open and close control loop

11: Temperature detection circuit

12: Prompt unit

Claims (10)

A rapid ignition control system for a gas furnace, based on a gas furnace, including: a thermocouple, a single-coil solenoid valve, a main control circuit, a switch circuit, a low-voltage high-current circuit, a fire detection circuit, a power supply unit, and a knob press switch ; The switch circuit is electrically connected between the output end of the thermocouple and the input end of the single-coil solenoid valve; the output end of the low-voltage high-current circuit is electrically connected to the input end of the single-coil solenoid valve; The circuit is electrically connected to the output end of the thermocouple; the main control circuit is electrically connected to the switch circuit, the low-voltage high-current circuit, and the fire detection circuit, and the knob press switch is electrically connected to the main control circuit and the Between the power supply units, and press the knob to press the switch to supply power to the power supply unit, so that the main control circuit controls the switch circuit from the open circuit state to the open state, and controls the low-voltage high-current circuit to output a circuit supply current to maintain A predetermined power supply time is supplied to the single coil solenoid valve to make the single coil solenoid valve perform a pre-suction valve and stop supplying the loop power supply current to the single coil solenoid valve after the predetermined power supply time, and control after a forced fire-off time The switch circuit is changed from an on state to an off state. The gas furnace rapid ignition control system as described in Claim 1, wherein the output voltage of the low-voltage high-current loop is 30mV and the output current of the loop is 130mA. The gas furnace rapid ignition control system as described in Claim 1, wherein the switch circuit is one of a relay switch and a semiconductor switch. The gas furnace rapid ignition control system as described in claim 1, wherein the power supply unit is a replaceable battery pack. The gas furnace rapid ignition control system as described in claim 4, wherein the main control circuit is further configured to detect the power of the power supply unit, and when it detects that the power of the power supply unit is weak, control a power supply The prompt unit connected to the main control circuit prompts a weak current message. The quick ignition control system of the gas furnace as described in claim 5, wherein the prompt unit is one or a combination of a display screen, an LED light and a buzzer. The quick ignition control system for a gas furnace as described in Claim 1, wherein the switch circuit has a first switch and a second switch connected to each other, which are respectively electrically connected to the main control circuit. The gas furnace rapid ignition control system as described in claim 7, wherein the first switch is a relay, and the second switch is a semiconductor switch, and the switch circuit is formed from an open state to an open state, firstly making the first switch The second switch is in an off state, and then the first switch is in an off state. The gas furnace rapid ignition control system as described in claim 1 further includes: an open-close control loop; wherein, the open-close control loop is electrically connected between the single-coil solenoid valve and the main control circuit, and the open-close control loop is configured for This single-coil solenoid valve is forced to open and close. The gas furnace rapid ignition control system as described in claim item 9 further includes: a temperature detection circuit; wherein, the temperature detection circuit is electrically connected to the main control circuit, and the temperature detection circuit can feed back the detected temperature to The main control circuit, and when an abnormal temperature is detected, the main control circuit forces the single-coil solenoid valve to switch off and close the valve through the opening and closing control loop.

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