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CN-121977231-A - Thermocouple type accidental flameout re-burning gas stove and control method

CN121977231ACN 121977231 ACN121977231 ACN 121977231ACN-121977231-A

Abstract

The invention discloses a thermocouple type accidental flameout and reburning gas stove and a control method, wherein the thermocouple type accidental flameout and reburning gas stove comprises a thermocouple, a signal detection module, a counting module, a control module, a pulse ignition module and an electromagnetic valve, wherein the thermocouple is used for detecting the flame state of a gas stove burner and outputting an electromotive force signal corresponding to the flame temperature, the signal detection module is electrically connected with the thermocouple, amplifies, filters and compares the electromotive force signal with a threshold value, identifies a flameout critical state and outputs a flameout trigger signal, the counting module is electrically connected with the control module and is used for accumulating the number of times of reburning trigger, the control module is electrically connected with each functional module respectively, and after receiving the flameout trigger signal, an ignition command is sent to the pulse ignition module in a preset flameout window period and the electromagnetic valve is controlled to be opened and closed according to the accumulated number of times of reburning trigger. The invention can realize accurate flameout and re-combustion control, reduce power consumption, prolong endurance, ensure safety and convenience and adapt to mass production upgrading of the existing kitchen range.

Inventors

  • WANG MENGJUN
  • DING TIEYONG
  • LIANG ZHIBO
  • SHEN QI

Assignees

  • 浙江帅康电气股份有限公司

Dates

Publication Date
20260505
Application Date
20260304

Claims (10)

  1. 1. The thermocouple type accidental flameout re-burning gas stove is characterized by comprising a thermocouple, a signal detection module, a counting module, a control module, a pulse ignition module and an electromagnetic valve; the thermocouple is used for detecting the flame state of the burner of the gas stove and outputting an electromotive force signal corresponding to the flame temperature; The signal detection module is electrically connected with the thermocouple and is used for amplifying, filtering and threshold comparison processing of an electromotive force signal output by the thermocouple, identifying a flameout critical state corresponding to the electromotive force signal and outputting a flameout trigger signal; the counting module is electrically connected with the control module and is used for accumulating the number of times of re-combustion triggering; The control module is respectively and electrically connected with the signal detection module, the counting module, the pulse ignition module and the electromagnetic valve, and is used for receiving the flameout trigger signal, sending an ignition instruction to the pulse ignition module in a preset flameout window period and controlling the on-off of the electromagnetic valve according to the accumulated number of times of the re-ignition trigger of the counting module.
  2. 2. The thermocouple type accidental flameout and re-ignition gas stove according to claim 1, wherein the signal detection module comprises a two-stage in-phase amplification circuit, and the total amplification factor of the two-stage in-phase amplification circuit is 500-1000 times.
  3. 3. The thermocouple type accidental flameout and re-ignition gas stove according to claim 1, wherein the signal detection module comprises a comparator circuit, an inverting input end of the comparator circuit is electrically connected with a signal output end of the thermocouple, and a non-inverting input end of the comparator circuit is connected with a reference voltage of 0.5-1.0V.
  4. 4. The thermocouple type accidental flameout afterburning gas range according to claim 1 further comprising a timing module electrically connected with the control module, said timing module for outputting a timing status signal to the control module, said control module enabling afterburning control logic only when the timing function is activated.
  5. 5. The gas cooker of claim 4, wherein the gas cooker comprises at least two burner heads, each burner head is correspondingly provided with an independent thermocouple, a signal detection module, a pulse ignition module, an electromagnetic valve and a timing module, and each timing module is independently in communication connection with the control module.
  6. 6. The thermocouple type accidental flameout and re-combustion control method is characterized by comprising the following steps of: s1, monitoring an electromotive force signal output by a thermocouple corresponding to a burner of a gas stove in real time; S2, when the electromotive force signal is identified to be reduced to a preset flameout critical threshold, judging that the flameout is accidental, and starting flameout window period timing with preset duration; s3, in the flameout window period, sending an ignition instruction to a pulse ignition module to trigger reburning, and accumulating the number of times of reburning triggering; s4, whether the re-combustion is successful is identified, if the re-combustion is successful, the normal monitoring state is recovered, if the re-combustion is unsuccessful, whether the accumulated re-combustion triggering times reach the preset maximum re-combustion times is judged, if yes, the gas electromagnetic valve is closed, and if not, the step S3 is returned to trigger the re-combustion again.
  7. 7. The method for controlling accidental flameout and afterburning by a thermocouple according to claim 6, wherein in step S2, the flameout critical threshold is 2mV, and the output electromotive force of the thermocouple during normal combustion is 5 v-10 mV.
  8. 8. The method for controlling accidental flameout and afterburning by a thermocouple according to claim 6, wherein in step S4, the criterion of success of afterburning is that the electromotive force signal output by the thermocouple is recovered to a normal combustion interval of 5-10 mV, and the stable maintaining time is not less than 30 seconds.
  9. 9. The method for controlling accidental flameout and afterburning by using a thermocouple according to claim 8, wherein the accumulated number of times of afterburning triggering is automatically cleared after afterburning is successful and stable combustion condition is satisfied.
  10. 10. The method for controlling accidental flameout and re-ignition by a thermocouple according to claim 6, wherein the method for controlling accidental flameout and re-ignition by a thermocouple according to claim 6 further comprises a pre-judging step before the step S1, wherein the timing function activation state of the gas cooker is obtained, the re-ignition control logic of the steps S1 to S4 is executed only when the timing function is in the activation state, and the gas electromagnetic valve is directly closed after the accidental flameout is identified if the timing function is not activated.

Description

Thermocouple type accidental flameout re-burning gas stove and control method Technical Field The invention relates to the technical field of safety control of gas cookers, in particular to a thermocouple type accidental flameout re-burning gas cooker and a control method. Background The gas stove is used as a household core cooking appliance, the use safety of the gas stove is always the core key point of industry research and development, and accidental flameout is one of the most common potential safety hazards in the use process of the gas stove. At present, the protection technology for unexpected flameout of a gas stove in the industry mainly surrounds flameout state detection, fault alarm and gas passage cutting-off and unfolding. The prior art CN106979539A discloses a gas stove and an accidental flameout detection and alarm device thereof, and the key scheme is that whether a gas rotary valve is in a valve opening state is judged through a valve rod rotation angle detector, meanwhile, the temperature of a stove head is sensed through a temperature sensing thermocouple and a corresponding electromotive force signal is output, when the gas rotary valve is judged to be in the valve opening state and the stove head is flameout, an accidental flameout signal is generated, and then a voice alarm and a lamplight prompt are triggered, or a pulse igniter, a gas main valve and a branch valve are closed through a switch assembly. The core logic of the scheme is the passive safety protection of flameout detection-alarm-valve closing, and a thermocouple is only used as a detection element of flameout state for fault identification and risk cutoff. The prior art CN106969384A discloses a gas stove integrating multiple voice reminding functions, wherein the core detection logic of an accidental flameout detection and alarm device is consistent with that of CN106979539A, accidental flameout events are detected and identified through valve rod state detection and thermocouple electromotive force monitoring, voice alarm and valve closing actions are triggered, and the functions of WIFI remote alarm, synchronous prompt of a fault indicator lamp and the like are expanded. The scheme still follows the basic protection logic of 'fault notification + risk shutdown', and no technical design is made for combustion state recovery after unexpected flameout. In addition, the existing technical scheme capable of realizing the flameout and re-burning functions mostly adopts an ion induction needle detection scheme. The scheme judges the flameout state through the current loop formed by monitoring the flame in real time, can realize the reburning control, but needs to continuously supply power to maintain the detection loop, has high static power consumption, seriously shortens the battery endurance of the battery-powered gas stove, increases the use cost and maintenance frequency of a user, and meanwhile, the ion induction needle scheme needs to additionally add an induction needle and a matched isolation and detection circuit, has high hardware transformation cost and is not beneficial to the large-scale popularization of products. In the prior art, the thermocouple is only used for triggering the electromagnetic valve to close after flameout, and the mv-level gradual-change electromotive force signal output in the flameout process is difficult to accurately identify by a common circuit, so that the technical prejudice that the thermocouple cannot be applied to the accurate control scene of flameout and reburning exists in the industry is caused, an accidental flameout and reburning control scheme based on the thermocouple is not developed all the time, and the technical problems of cooking interruption and food waste caused by untimely processing of a user after accidental flameout cannot be solved, and the existing reburning scheme is high in power consumption and high in cost are solved. Therefore, there is a need in the art to develop a technical solution that has low power consumption, low cost and high reliability, and can realize accurate re-ignition control after accidental flameout, so as to fill the functional gap in the prior art and solve the technical defects. Disclosure of Invention The invention aims to solve the technical problem of providing a thermocouple type accidental flameout and re-ignition gas stove and a control method thereof, which can realize accurate flameout and re-ignition control by taking a thermocouple as a core, reduce power consumption, prolong endurance, ensure safety and convenience and adapt to mass production upgrading of the existing stove. In order to solve the technical problems, the first aspect of the invention discloses a thermocouple type accidental flameout reburning gas stove, which comprises a thermocouple, a signal detection module, a counting module, a control module, a pulse ignition module and an electromagnetic valve; the thermocouple is used for detecting the flame state of