A non-contact dry-burn prevention control method for an electrically controlled gas stove

Abstract

The application relates to a non-contact dry burning prevention control method of an electrically-controlled gas stove, the gas stove comprising a burner, a thermocouple sensing needle, a controller and a valve assembly, the valve assembly being used for providing gas to the burner and being used for cutting off or opening the gas supply of the burner, the thermocouple sensing needle being electrically connected with the controller through a wire, the thermocouple sensing needle being used for sensing the thermal electromotive force when the burner of the burner is combusted and transmitting the sensed thermal electromotive force to the controller through the wire, taking the average value of the thermal electromotive force input in a previous period of time as A, taking the average value of the thermal electromotive force input in a later period of time as B, taking a preset value as C, and when B>=A+C, the controller instructs the valve assembly to cut off the gas supply. The application compares the thermal electromotive force of the thermocouple sensing needle before and after, so as to judge whether the current dry burning condition exists, and the gas is cut off in time.

Description

Technical Field

[0001] This invention relates to a non-contact anti-dry-burning control method for an electrically controlled gas stove. Background Technology

[0002] Current gas stove anti-dry-burning technology uses contact-type NTC thermostats to sense temperature. When a certain temperature value is reached, the control panel closes the valve, thus shutting off the gas stove and preventing fire accidents caused by over-combustion. Its shortcomings are as follows: 1. Limited application scenarios: Current NTC thermistor temperature sensing is contact-type, therefore, it is installed in the center of the burner, in contact with the bottom of the cooking appliance. Consequently, the flame in the burner's central ring cannot be directed towards the center. 2. High cost: NTC anti-dry-burning thermostats require high manufacturing precision and need to be used in high-temperature environments. Most of the thermistors used in current NTC anti-dry-burning thermostats need to be imported. 3. The control method uses a fixed temperature value as the basis for judgment, which cannot fully encompass the dynamic complexity of combustion, resulting in instability and occasional misjudgments. Therefore, further improvements are necessary. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned problems and provide a non-contact anti-dry-burning control method for electric gas stoves, which solves the problem of limited application scenarios and reduces production costs.

[0004] To achieve the above objectives, the present invention provides a non-contact anti-dry-burning control method for an electric gas stove. The gas stove includes a burner head, a thermocouple induction needle, a controller, and a valve assembly. The valve assembly is used to supply gas to the burner head and to cut off or open the gas supply to the burner head. The thermocouple induction needle is electrically connected to the controller via a wire. The thermocouple induction needle is used to sense the thermoelectric potential of the burner head during combustion and transmits the sensed thermoelectric potential to the controller via the wire. The average value of the thermoelectric potential input over a previous period is taken as A, the average value of the thermoelectric potential input over a subsequent period is taken as B, and a preset value is taken as C. When B≥A+C, the controller instructs the valve assembly to cut off the gas supply.

[0005] In one or more embodiments, the burner head is provided with a central flame cap and an outer ring flame cap, and the thermocouple induction needle is located near the central flame cap where the flame burns to one side.

[0006] In one or more embodiments, the gas stove is provided with a touch control panel, the touch control panel is provided with a display screen, the worktable of the gas stove has a window corresponding to the touch control panel, and the touch control panel is electrically connected to the controller.

[0007] In one or more embodiments, the controller and touch control panel are located on the front side inside the gas stove.

[0008] In one or more embodiments, a stove rack is provided on the worktable of the gas stove at the position corresponding to the burner head. The stove rack is used to support cooking utensils and prevent the thermocouple induction needle from contacting the cooking utensils.

[0009] Compared with the prior art, the advantages of this invention are: by collecting the thermoelectric potential of the thermocouple sensing needle and comparing it before and after, it can determine whether there is dry burning and cut off the gas source in time to solve the safety hazard; and by adopting a non-contact method, it does not come into contact with the cooking pot, thus making full use of the center flame, reducing production costs, fully accommodating the dynamic complexity of combustion, and reducing misjudgment. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a gas stove employing a non-contact anti-dry-burning control method according to an embodiment of the present invention;

[0011] Figure 2 This is a schematic diagram of the structure in which the thermocouple induction needle is located inside the central flame cap according to an embodiment of the present invention. Detailed Implementation

[0012] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0013] Please refer to Figure 1-2 This application provides a non-contact anti-dry-burning control method for an electrically controlled gas stove. The gas stove includes a burner 1, a thermocouple induction needle 2, a controller 3, and a valve assembly. The valve assembly is used to supply gas to the burner 1 and to cut off or open the gas supply to the burner. The thermocouple induction needle 2 is electrically connected to the controller 3 through a wire 21. The thermocouple induction needle 2 is used to sense the thermoelectric potential of the burner 1 during combustion and transmits the sensed thermoelectric potential to the controller 3 through the wire 21. The average value of the thermoelectric potential input in the previous period is A, the average value of the thermoelectric potential input in the next period is B, and the preset value is C. When B≥A+C, the controller 3 instructs the valve assembly to cut off the gas supply. This solution uses a non-contact anti-dry-burning control. The controller compares the average value of the thermoelectric potential generated by the thermocouple sensing needle with the average value of a certain time period before and after. Compared with the traditional NTC contact type, it has lower production cost, higher accuracy, and less possibility of misjudgment. It can also make full use of the central ring fire for concentrated heating, which is unmatched by NTC contact type temperature sensors.

[0014] The burner head 1 is equipped with a central burner cap 4 and an outer ring burner cap 5. Thermocouple sensing needle 2 is located near the central burner cap, so that the flame burns to one side, allowing the thermocouple sensing needle to record the optimal thermoelectric potential data, further improving the safety of the gas stove.

[0015] The gas stove is equipped with a touch control panel 6, which has a display screen 7. The display screen can show information such as firepower and time for user reference. The worktable 8 of the gas stove has a window corresponding to the touch control panel 6. The touch control panel 6 is electrically connected to the controller 3 so that the user can control the operation of the gas stove by touch.

[0016] The controller 3 and the touch control panel 6 are located on the front side inside the gas stove, thus keeping them away from the burner head. This reduces the impact of heat radiation from the burner head on the lifespan of the controller and the touch control panel, and improves the service life of the gas stove.

[0017] The worktable 8 of the gas stove is provided with a stove rack 9 at the position corresponding to the burner 1. The stove rack 9 is used to support cooking utensils and prevent the thermocouple induction needle 2 from contacting the cooking utensils, so as to avoid the cooking utensils affecting the thermoelectric potential recorded by the thermocouple induction needle after contact with the thermocouple induction needle.

[0018] The above description is only a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present invention should be included in the scope of protection set forth in the claims.

Claims

1. A non-contact anti-dry-burning control method for an electrically controlled gas stove, characterized in that: The gas stove includes a burner (1), a thermocouple induction needle (2), a controller (3), and a valve assembly. The valve assembly is used to supply gas to the burner (1) and to cut off or open the gas supply to the burner. The thermocouple induction needle (2) is electrically connected to the controller (3) through a wire (21). The thermocouple induction needle (2) is used to sense the thermoelectric potential of the burner when it is burning and to transmit the sensed thermoelectric potential to the controller (3) through the wire (21). The average value of the thermoelectric potential input in the previous period is A, the average value of the thermoelectric potential input in the next period is B, and the preset value is C. When B≥A+C, the controller (3) instructs the valve assembly to cut off the gas supply.

2. The non-contact anti-dry-burning control method for an electrically controlled gas stove according to claim 1, characterized in that: The burner head (1) is provided with a central flame cap (4) and an outer ring flame cap (5), and the thermocouple induction needle (2) is located near the central flame cap where the flame burns to one side.

3. The non-contact anti-dry-burning control method for an electrically controlled gas stove according to claim 1, characterized in that: The gas stove is equipped with a touch control panel (6), which has a display screen (7). The worktable (8) of the gas stove has a window corresponding to the touch control panel (6). The touch control panel (6) is electrically connected to the controller (3).

4. The non-contact anti-dry-burning control method for an electrically controlled gas stove according to claim 3, characterized in that: The controller (3) and the touch control panel (6) are located on the front side inside the gas stove.

5. The non-contact anti-dry-burning control method for an electrically controlled gas stove according to claim 1, characterized in that: The gas stove workbench (8) is provided with a stove rack (9) at the position corresponding to the burner head (1). The stove rack (9) is used to support cooking utensils and prevent the thermocouple induction needle (2) from contacting the cooking utensils.

Images