CN110242980A - A thermocouple solenoid valve instantaneous suction type single-needle sensor pulse ignition controller for gas cooker - Google Patents

Abstract

A thermocouple solenoid valve instant suction type single-needle sensing pulse ignition controller for gas cookers, including a DC power supply, an ignition switch, an ignition module, a thermocouple solenoid valve, a constant current source module, a single-needle sensing module, and a first extension time switch circuit, the second delay switch circuit, the third delay switch circuit, the first short time delay switch circuit and the second short time delay switch circuit, and the first charging capacitor, the second charging capacitor and the third charging capacitor Capacitor: the input end of the first delay circuit is connected to the negative pole of the DC power supply, the first output end is connected to the input end of the constant current source module; the second output end is connected to the input end of the ignition module through a diode. The input end of the third delay switch circuit is connected to one end of the ignition switch through the third charging capacitor, and the output end of the third delay switch circuit is connected to the second input end of the constant current source module.

Description

A thermocouple solenoid valve instantaneous suction type single-needle sensor pulse ignition controller for gas cooker

technical field

The invention relates to the technical field of safety protection for ignition control of gas cookers, in particular, a common single-coil thermocouple solenoid valve can be used to open the valve in zero seconds, and the method of combining an ignition needle and an induction needle to achieve the pulse ignition control of instant ignition and stop ignition device.

Background technique

At present, the vast majority of safe household gas cookers with flameout protection on the market in our country use thermocouple solenoid valve type safety flameout protection devices, and the supporting pulse ignition controllers for this purpose can be divided into two categories: one is ordinary Type pulse ignition controller, the other is single or double coil instantaneous suction type (zero second valve opening) pulse ignition controller.

The so-called ordinary pulse ignition controller is only responsible for ignition in the gas cooker, and has no other additional functions. When using the gas cooker, the user first presses the on switch to ignite the fire and cannot let go immediately. It needs to be pressed for a few seconds to wait for the thermocouple to turn on. The probe is heated by the fire and the electromagnetic valve can only be released after the solenoid valve is attracted, otherwise the gas cooker cannot be ignited normally.

While the instantaneous suction type pulse ignition controller is ignited, the pulse ignition controller first supplies power to the secondary coil of the thermocouple solenoid valve for 6-15 seconds, so that the thermocouple solenoid valve is instantly sucked in (called zero-second valve opening). There are two types of ignition controllers, one is to press the switch to ignite and the stove is ignited before letting go, and the other is to press the switch to ignite and let go. The ignition time is basically synchronized with the pull-in time of the thermocouple solenoid valve, usually 8 seconds Left and right (claim delay igniter).

At present, this kind of instantaneous suction pulse ignition controller on the market adopts a double-coil solenoid valve, while the delayed opening valve generally adopts a timing power supply control method composed of a resistor and a capacitor transistor with a simple structure. Although the structure is simple, once a certain triode is damaged, it will bring serious consequences, that is, the solenoid valve will be closed for a long time, and it will not have the function of safety protection, which is extremely dangerous. Moreover, the delayed ignition controller on the market is ignited for about 8 seconds no matter whether it is ignited or not, which not only wastes electricity but also makes the user dissatisfied, thinking that the fire is still ignited after being ignited.

Contents of the invention

In order to solve the above problems, the present invention proposes a single-coil (double-coil) thermocouple solenoid valve single-needle flame sensing technology instantaneous suction type gas cooker pulse ignition controller, through the protection of the delay switch circuit connected in series, to overcome the A certain triode in the delay circuit is damaged and the solenoid valve is closed for a long time, which greatly improves the safety of the pulse ignition controller. Moreover, the present invention also adopts the single-pin sensing technology that combines the ignition pin and the induction, and realizes the function that the delay ignition controller ignites and then stops ignition. This saves electricity and improves the overall ignition effect of the cooker.

In order to achieve the above object, the technical solution adopted by the present invention is: a single-coil (double-coil) thermocouple solenoid valve instantaneous suction type single-needle sensing gas cooker pulse ignition controller, including a DC power supply, an ignition switch, an ignition module, Constant current source module, thermocouple solenoid valve, induction module, first delay switch circuit, second and third delay switch circuits, see Figure 3. The input end of the first delay switch circuit is connected to the negative pole of the DC power supply, and the output end is connected to the input end of the constant current source module, the second output end of the first delay switch circuit is connected to the input end of the ignition module through a diode, and the first input end of the second delay switch circuit is connected to the output end of the constant current source module, The output end of the second delay switch circuit is connected to the input end of the thermocouple solenoid valve, and the other end of the thermocouple solenoid valve is connected to the positive pole of the DC power supply. The input terminal of the third delay switch circuit is connected to the ignition switch through the third charging capacitor, and the output terminal of the third delay switch circuit is connected to the second input terminal of the constant current source module.

The second output terminal of the second delay switch circuit is connected to the sensing module through a diode, and one end of the sensing module is connected to the negative pole of the power supply. When the cooker is ignited and the ignition pin senses the flame, the sensing module immediately outputs a low potential to make Q31 (or Q32 ) is turned on to output a high potential so that the Q29 (or Q30) triode is cut off and the ignition is stopped.

The thermocouple solenoid valve is powered by the first delay switch circuit, the second delay switch circuit, the third delay switch circuit and the constant current source module in series. It has triple protection functions, which greatly improves the safety of the circuit.

The sensing pin and the ignition pin share a sensing mode, and a piezoresistor is used for isolation.

Beneficial effects: the constant current source circuit is used to supply power to the thermocouple solenoid valve, which overcomes the problem that the single-coil thermocouple solenoid valve cannot be used in the instantaneous suction ignition controller, and the cost of the single-coil thermocouple solenoid valve is lower, and the structure Also simple and reliable. The constant current source module composed of two triodes and two resistors is cheaper than ordinary constant current diodes, and one of the resistors is a variable adjustable resistor, and the output current can be easily adjusted by changing the resistance value of the resistor. By connecting two delay switch circuits in series, and the constant current source module between the two delay switch circuits and the third delay circuit connected in series with it, when one or two delay switch circuits are damaged and fail, this can also be guaranteed. The pulse ignition controller closes the electromagnetic valve within a safe time, so that the pulse ignition controller of the gas cooker can be pulled in instantly and has triple safety protection, which greatly improves the safety. The way to supply power to the delay switch circuit after charging the capacitor through the short-time delay switch circuit makes the delay ignition and suction valve time unchanged regardless of the ignition switch being turned on for a short time or normally closed. The stability of the pulse ignition controller is improved. The delay time of the second and third delay switch circuits is designed to be a few seconds longer than that of the first delay switch circuit to ensure that the thermocouple solenoid valve is still closed when the ignition module is ignited, ensuring the instant suction effect . The varistor device is used to effectively isolate the path between the induction signal and the shell ground, and the high voltage can be conducted to the shell ground through the breakdown varistor to form a high-voltage circuit. The varistor is more expensive than other gas discharge tubes and gap isolation. Lower, better reliability and durability. The combination of ignition needle and induction needle is adopted, and the function of ignition and stop ignition can be realized without changing the stove, saving electricity, better ignition effect, and more satisfied users.

Description of drawings

Fig. 1 is a schematic circuit diagram of a pulse ignition controller of a traditional double-coil thermocouple solenoid valve instantaneous suction type gas cooker.

Fig. 2 is a schematic diagram of a pulse ignition controller for an instant-ignition gas cooker whose ignition and suction valves are time-synchronized.

Fig. 3 is the pulse point of the gas cooker with single-coil (double-coil) thermocouple solenoid valve instantaneous suction type single-needle sensing technology of the present invention

Schematic block diagram of the fire controller circuit.

Fig. 4 is the gas cooker pulse of single-coil (double-coil) thermocouple solenoid valve instantaneous suction type single-needle sensing technology in the embodiment

Circuit diagram of ignition controller

Detailed ways

As shown in Figure 1, it is a circuit block diagram of a traditional double-coil thermocouple solenoid valve instantaneous suction type gas cooker pulse ignition controller. The delayed valve opening is controlled by a delay switch circuit composed of resistors, capacitors and triodes. Although the method and structure are simple, as long as one triode is damaged in the delay switch circuit, the solenoid valve will be sucked in for a long time and cannot be used for safety protection.

As shown in Fig. 2, it is a block diagram of a delayed ignition pulse ignition controller circuit, which also has unsafe factors. Simultaneously when the cooking range is ignited, still igniting not only wastes electricity, the user is also dissatisfied.

As shown in Figure 3, the single-coil (or double-coil) thermocouple solenoid valve instantaneous suction type single-needle sensing technology pulse ignition controller includes a DC power supply, an ignition switch, an ignition module, a thermocouple solenoid valve, a constant current source module, Induction module, first delay switch circuit, second delay switch circuit, third delay switch circuit, first short delay switch circuit and second short delay switch circuit, first charging capacitor C3, second charging capacitor C7 and the third charging capacitor C1, wherein the first input end of the first delay switch circuit is connected to the negative pole of the DC power supply, the first output end of the first delay switch circuit is connected to the first input end of the constant current source module, and the first delay The second output end of the time switch circuit is connected to the input end of the ignition module through a diode, the first input end of the second delay switch circuit is connected to the output end of the constant current source module, and the first output end of the second delay switch circuit is connected to the thermoelectric The input terminal of the couple solenoid valve and the output terminal of the thermocouple solenoid valve are connected to the positive pole of the DC power supply, and the second output terminal of the second delay switch circuit is connected to the sensing module through a diode. One end of the sensing module is connected to the negative pole, and the other end is connected to the positive pole of the power supply through a diode, resistors R69 and Q33.

Since the internal resistance of the single-coil thermocouple solenoid valve is very small, which is milliohm level (about 20mΩ), it can be used to supply power to the solenoid valve by introducing a constant current source module, which overcomes the problem that the single-coil thermocouple solenoid valve cannot be used for instantaneous suction pulse ignition The difficulty of the controller reduces the cost of using the thermocouple solenoid valve. Although the single-coil thermocouple solenoid valve is used as an example in the embodiment, the circuit can also be applied to the double-coil thermocouple solenoid valve.

Furthermore, the constant current source module is composed of two resistors and two triodes, which is lower in cost than ordinary diode constant current power supplies, and one of the resistors can be an adjustable resistor, so that the adjustable resistance value can control the output current of the constant current source module. Size, the output current constant range of the constant current source module of this circuit is between 160-220mA. When the dry battery is at 3V or drops to 2.1V, its output current is basically constant between 160-220mA, which can make the single-coil thermocouple The solenoid valve is reliably closed. Since this circuit adopts the power supply method of three circuits in series to the solenoid valve, when one or two circuits fail, the valve can still be closed in the safe time, which greatly improves the safety. Finally, after the ignition needle senses the flame, the comparator in the induction module reverses and outputs the control signal, so that the Q29 in the ignition module stops oscillating, and the ignition module stops ignition. It not only saves electric energy but also has a particularly good effect. The induction module adopts the single-pin sensing technology that combines the ignition pin and the sensing pin. Not only does the cooker need no modification, but also adopts the varistor isolation technology, which is more cost-effective than other isolation structures such as discharge tubes and gap isolation. Low, better reliability and durability.

The constant current source module consists of at least two triodes and two resistors, and is used to supply power to the thermocouple solenoid valve.

One of the resistors is a variable resistor, which is used to control the output current of the constant current source module.

The current of the constant current source module is set between 160-220mA, which is used for single-coil thermocouple solenoid valves. When the current is adjusted to about 100mA, it can be used for double-coil thermocouple solenoid valves.

The delay time of the first short-time delay switch circuit and the second short-time delay switch circuit is 0.4-1 second.

The delay time of the first delay switch circuit is 8±2 seconds, and the second delay time and the third delay time are 10-15 seconds.

The sensing module consists of at least one comparator, two diodes, four resistors and four capacitors.

The sensing module is used to isolate the flame signal to the ground path and enable the high voltage to have a loop. The piezoresistor is used, which is low in cost and high in reliability, and is superior to gas discharge tubes and other methods.

The schematic diagram of the igniter in the figure shows two sets of independent ignition induction circuits, so the working principle of the switch K2 is the same as that of K1, and will not be described again.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (3)

1. a kind of thermocouple solenoid valve wink suction type single needle senses gas cooker pulse igniting controller, which is characterized in that including straight Galvanic electricity source, ignition switch, ignition module, thermocouple solenoid valve, constant current source module, single needle sensing induction module, the first delay are opened Delay switch circuit and when the second short time-delay, open in short-term for powered-down road, the second delay switch circuit, third delay switch circuit, first Powered-down road and the first charging capacitor, the second charging capacitor and third charging capacitor: wherein the input terminal of the first delay circuit connects DC power cathode is connect, the first output end connects the input terminal of constant current source module；Second output terminal passes through diode connection point fire The input terminal of module；

The output end of the input terminal connection constant current source module of second delay switch circuit, the first output of the second delay switch circuit End connection thermocouple solenoid valve input terminal, the anode of the other end connection DC power supply of thermocouple solenoid valve, the second delay switch The second output terminal of circuit connects induction module by diode, and the induction module other end connects DC power cathode；

The input terminal of third delay switch circuit is connected to one end of ignition switch, third delay switch by third charging capacitor Second input terminal of the output end connection constant current source module of circuit.

2. gas cooker pulse igniting controller according to claim 1, which is characterized in that thermocouple solenoid valve is by first Delay switch circuit, the second delay switch circuit, third delay switch circuit and the power supply of constant-current source block coupled in series.

3. gas cooker pulse igniting controller according to claim 1, which is characterized in that inductive needle and igniting needle share The inductive mode of a piece needle, and use varistor and be isolated.