CN201425328Y - Gas stove overheating and empty burning prevention device - Google Patents

Abstract

The utility model discloses a device for preventing overheating and empty burning of a gas stove, which is characterized in that it comprises a temperature sensor for detecting the temperature of the bottom of the pot, a temperature sensor control circuit, a single-chip microprocessor, and a main electromagnetic valve installed on the main gas pipeline. And the main solenoid valve control circuit. In addition to the traditional low-temperature flameout protection function, the utility model adds intelligent high-temperature protection, which has a sensitive perception of the temperature of the pot, so as to meet the effect of most pots to prevent empty burning, so that It can effectively prevent the occurrence of fire accidents caused by abnormal high temperature such as empty cooking, and protect family property and life safety throughout the process. It has high precision, simple and stable system, and relatively low cost, meeting people's needs for safe use of gas stoves.

Description

Gas stove overheating and empty burning prevention device

technical field

The utility model relates to a gas stove overheating anti-air burning device based on the intelligent control of a single-chip microprocessor.

Background technique

Gas stoves are very popular in households. At present, most of the gas stoves produced on the market use mechanical methods to control the gas, and mainly to overcome the midway shutdown. It is difficult to guarantee the safety of users.

Contents of the invention

In order to overcome the above-mentioned defects, the utility model provides a device for preventing overheating and empty burning of gas stoves. In addition to the traditional low-temperature flameout protection function, the device and method have added intelligent high-temperature protection to meet the requirements of most cookers to prevent air-burning. The effect of burning, and high precision, simple and stable system.

The technical scheme that the utility model adopts in order to solve its technical problem is:

A device for preventing overheating and empty burning of a gas stove, comprising a temperature sensor for detecting the temperature of the bottom of the pot, a temperature sensor control circuit, a single-chip microprocessor, a main solenoid valve installed on the main gas pipeline, and a main solenoid valve control circuit, the The single-chip microprocessor controls the temperature sensor control circuit to control the temperature sensor to detect the temperature at the bottom of the pot, and the temperature sensor control circuit transmits the collected temperature data to the single-chip microprocessor for program analysis and processing. The single-chip microprocessor performs overheat discrimination on the processed data, and the single-chip microprocessor controls the opening and closing of the main solenoid valve through the main solenoid valve control circuit.

A flameout protection device is provided, and the flameout protection device is mainly composed of a thermocouple, a self-priming valve installed on the gas branch pipeline and a thermocouple control circuit. The thermocouple detects that the gas stove is on fire and transmits the detection data to the single-chip microcomputer The microprocessor performs analysis and processing, and the single-chip microprocessor controls the opening and closing of the self-priming valve through the thermocouple control circuit. A thermocouple is a component that can convert temperature into voltage. It uses the change of thermal power to detect the ignition of the gas stove, sends the detection result to the single-chip microprocessor, and opens the self-priming valve and the main solenoid valve to make the gas flow. When an abnormal situation occurs, close the main solenoid valve in time to ensure safety.

An alarm is provided, and the alarm can send out a warning sound, and the alarm is controlled by the microprocessor of the single-chip microcomputer.

A boosting unit is provided, and the boosting unit is composed of several dry batteries and a boosting circuit that boosts the voltage of the dry batteries and supplies the single-chip microprocessor and related devices to work. The boost unit boosts the voltage of two 1.5V dry batteries to 5V for use by single-chip microprocessors and related devices.

The single-chip microprocessor is provided with a database for extracting data.

Described one-chip microcomputer microprocessor is provided with the timer for timing it.

The beneficial effects of the utility model are: in addition to the traditional low-temperature flameout protection function, the utility model adds intelligent high-temperature protection, which has a sensitive perception of the temperature of the pot, so as to meet the effect of most pots to prevent empty burning. In this way, it can effectively prevent the occurrence of fire accidents caused by abnormal high temperatures such as empty cooking, and protect family property and personal safety throughout the process. It has high precision, simple and stable system, and relatively low cost, meeting people's needs for safe use of gas stoves. .

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the specific flow chart of the utility model preventing overheating empty burning process;

Fig. 3 is a schematic diagram of some circuits of the utility model (including a thermocouple control circuit, a temperature sensor control circuit, a main solenoid valve control circuit and a switch signal circuit).

Detailed ways

Embodiment: A device for preventing overheating and empty burning of a gas stove, including a temperature sensor for detecting the temperature of the bottom of the pot, a temperature sensor control circuit, a single-chip microprocessor, a main solenoid valve installed on the main gas pipeline, and a main solenoid valve control circuit , the single-chip microprocessor controls the temperature sensor control circuit to control the temperature sensor to detect the temperature at the bottom of the pot, and the temperature sensor control circuit transmits the collected temperature data to the single-chip microprocessor for program analysis and processing, the single-chip microprocessor performs overheating discrimination on the processed data, and the single-chip microprocessor controls the opening and closing of the main solenoid valve through the main solenoid valve control circuit.

A flameout protection device is provided, and the flameout protection device is mainly composed of a thermocouple, a self-priming valve installed on the gas branch pipeline and a thermocouple control circuit. The thermocouple detects that the gas stove is on fire and transmits the detection data to the single-chip microcomputer The microprocessor performs analysis and processing, and the single-chip microprocessor controls the opening and closing of the self-priming valve through the thermocouple control circuit. A thermocouple is a component that can convert temperature into voltage. It uses the change of thermal power to detect the ignition of the gas stove, sends the detection result to the single-chip microprocessor, and opens the self-priming valve and the main solenoid valve to make the gas flow. When an abnormal situation occurs, close the main solenoid valve in time to ensure safety.

An alarm is provided, and the alarm can send out a warning sound, and the alarm is controlled by the microprocessor of the single-chip microcomputer.

A boosting unit is provided, and the boosting unit is composed of several dry batteries and a boosting circuit that boosts the voltage of the dry batteries and supplies the single-chip microprocessor and related devices to work. The boost unit boosts the voltage of two 1.5V dry batteries to 5V for use by single-chip microprocessors and related devices.

The single-chip microprocessor is provided with a database for extracting data.

Described one-chip microcomputer microprocessor is provided with the timer for timing it.

The specific flow of the utility model to prevent overheating and empty burning is shown in Figure 2: when starting up each time, first initialize and wait, then detect the fault, if there is a fault, the alarm buzzer will alarm, and the main solenoid valve will be closed; if there is no fault, the balance time will be calculated , after the balance time is over, the temperature will be collected in a timely manner, and sent to the single-chip microprocessor for program analysis and processing; after the processing is completed, overheat detection will be carried out. If it is higher than the overheating temperature point, wait for 1 minute to judge again. If it is still higher than the overheating temperature point Then close the main solenoid valve; if it is lower than the overheating curve, the overheating curve will be judged, and the temperature rising slope (ΔYY) collected for a fixed time will be compared with the set standard temperature rising slope (ΔY). If ΔYY is higher than ΔY, wait for 1 minute and try again. Judging, if ΔYY is still higher than ΔY, then close the main solenoid valve, and if ΔYY is lower than ΔY, then return to fault detection.

The principle diagram of the thermocouple control circuit, temperature sensor control circuit, main solenoid valve control circuit and switch signal circuit of the gas stove overheating and empty burning prevention device described in the utility model is shown in Figure 3:

The thermocouple control circuit is composed of operational amplifier U2 and a series of components. The thermocouple converts the temperature into a voltage, amplifies the weak voltage and sends it to the microcontroller for processing, and opens the self-priming valve and the main solenoid valve to make the gas flow. When an abnormal situation occurs, close the main solenoid valve in time to ensure safety.

The temperature sensor senses the temperature at the bottom of the pot, and one end is connected to the AD port of the microcontroller microprocessor, which can convert the collected temperature into digital quantities for processing and analysis by the microcontroller microprocessor. This part is composed of R16 pull-up, R17, R18 pull-down and C4 (the resistance of R17 is much smaller than that of R18). During overheat detection, when it is higher than the overheating temperature point, a partial modification will be made after waiting for 1 minute, and R18 will be used as a pull-down adjustment to prevent misjudgment.

The main solenoid valve control circuit (Note: 3V is the power supply voltage, 3V1 is the input voltage of the boost chip, and 5V is the output voltage after boosting), when the mechanical knob switch of the cooker is pressed down, the power supply is divided into two circuits through the switch: one of them is charged to E5 , so that Q5 is turned on; the base voltage of Q7 is negatively biased to ground by R13 and Q5 to make Q7 turn on, and 3V supplies power to the boost unit through Q7, and after the voltage rises to 5V, it supplies power to the single-chip microprocessor (U1); Immediately after the initialization of U1 is completed, a continuous pulse signal is sent at pin 18. The pulse signal provides a high level to the base of Q4 through E2, Q2, R6, Q1, and E4, so that Q4 is turned on to maintain the negative bias of the base of Q7. Make Q7 in the long-pass state to realize the maintenance of power supply when starting up. E5 cuts off Q5 and stops working due to the completion of charging; the first function of E3 in the circuit is to prolong the conduction time of Q1 by charging the capacitor E3; the second is to cooperate with E2 to prevent malfunction due to interference. The other way is sent to the base of Q6, so that Q6 is turned on and the pin 9 of U1 is set to low level, which is used as switch reset control (low level is power-on state; high level is power-off). After the start-up is completed, pin 7 of U1 outputs a high level to turn on the main solenoid valve to ignite. After the ignition is successful, pin 17 of U1 outputs a low level to turn on Q3 to keep the main solenoid valve open. When a fault is detected, pin 17 of U1 sets a high voltage. Make Q3 cut off, close the main solenoid valve, and cut off the gas source. This circuit can effectively prevent the system from being disturbed by instantaneous discharges such as lightning strikes.

Claims (6)

1, a kind of overheating air-burn preventing device of gas stove, it is characterized in that: comprise the temperature sensor that is used to detect the pan bottom temp, the temperature sensor control circuit, singlechip microprocessor, be installed on main solenoid valve and main solenoid valve control circuit on the gas trunk line, described singlechip microprocessor is controlled described temperature sensor control circuit and is controlled the temperature that described temperature sensor detects the pan bottom, described temperature sensor control circuit passes to described singlechip microprocessor with the temperature data that collects and carries out formula analysis and processing, described singlechip microprocessor is carried out overheated distinguishing to the data after handling, and described singlechip microprocessor is controlled the keying of described main solenoid valve by the main solenoid valve control circuit.

2, overheating air-burn preventing device of gas stove according to claim 1; it is characterized in that: be provided with flame-out protection device; described flame-out protection device mainly is made up of thermocouple, the self-priming valve and the thermocouple control circuit that are installed on the gas subtube; described thermocouple detects gas-cooker and to fight and detections data are passed to described singlechip microprocessor analyze and handle, and described singlechip microprocessor is controlled the keying of self-priming valve by described thermocouple control circuit.

3, overheating air-burn preventing device of gas stove according to claim 1 is characterized in that: be provided with alarm, described alarm can send caution sound, and described alarm is controlled by described singlechip microprocessor.

4, overheating air-burn preventing device of gas stove according to claim 1, it is characterized in that: be provided with boosting unit, described boosting unit also constitutes for the booster circuit of singlechip microprocessor and relevant apparatus work by some dry cells with the dry cell boost in voltage.

5, overheating air-burn preventing device of gas stove according to claim 1 is characterized in that: described singlechip microprocessor is provided with the data bank of the data of extracting for it.

6, overheating air-burn preventing device of gas stove according to claim 1 is characterized in that: described singlechip microprocessor is provided with the timer to its timing.

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