EP4352417A1

EP4352417A1 - Cooktop and panel assembly with overflow detection

Info

Publication number: EP4352417A1
Application number: EP22729632.4A
Authority: EP
Inventors: Tingting ZHU; Li Fang; Jinhua Wu; Weiwei Miao
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2021-06-11
Filing date: 2022-05-19
Publication date: 2024-04-17
Also published as: WO2022258339A1; CN216203550U

Abstract

Embodiments of the present utility model relate to a cooktop and a panel assembly with overflow detection. The cooktop includes: a panel assembly; a burner disposed on the panel assembly; and an overflow sensor, configured to detect an overflow state of a cooking utensil, where the overflow sensor is concealed below the panel assembly. In this way, the overflow sensor is not exposed above the panel assembly, so that the panel assembly is relatively flat and easy to clean, and the overflow sensor can be better protected, thereby prolonging the service life of the overflow sensor.

Description

COOKTOP AND PANEL ASSEMBLY WITH OVERFLOW DETECTION

TECHNICAL FIELD

Embodiments of the utility model relate to the field of cooktops, and in particular, to a cooktop and a panel assembly with overflow detection.

BACKGROUND

The Chinese patent No. CN106969387CN discloses a cooktop, including a burner, an electronic control gas valve, a temperature sensor, a controller, and a cooking program built in the controller. A gas inlet and a gas supply pipe of the electronic control gas valve are in communication with each other, and a gas outlet of the electronic control gas valve is communicated with a gas inlet of the burner. The temperature sensor and the cooktop are configured to detect the temperature of the cookware. The cooking program is configured with a time-related specified value of a cookware temperature and a time. The controller controls the electronic control gas valve according to the specified value and a measured value of the cookware temperature in the cooking program, and adjusts the power of the burner, so that the measured value of the cookware temperature reaches the specified value until the cooking program is executed, and cooking is completed.

SUMMARY

An objective of the present utility model is to provide an improved cooktop and panel assembly with overflow detection for improving user experience.

An aspect of the embodiments of the present utility model provides a cooktop with overflow detection, including: a panel assembly; a burner disposed on the panel assembly; and an overflow sensor, configured to detect an overflow state of a cooking utensil, where the overflow sensor is concealed below the panel assembly.

First, the present application provides a cooktop with overflow detection. When an overflow occurs and a fluid flows to a panel assembly, gas supply is controlled in time to prevent continuous fluid spilling, which both reduces food waste and reduces possibility of the cooktop being difficult to clean due to fluid spilling.

Besides, an overflow sensor is concealed below the panel assembly, so that the overflow sensor is not exposed above the panel assembly. In this way, the panel assembly is relatively flat and easy to clean, and the overflow sensor can be better protected, thereby prolonging the service life of the overflow sensor.

In a possible implementation, the panel assembly includes a fluid pan. The fluid pan is located below the burner and disposed around the burner. The overflow sensor is concealed below the fluid pan. Therefore, not only the panel assembly is easy to clean, but also it is possible to integrate the overflow sensor with the fluid pan, which facilitates assembly of the cooktop.

In a possible implementation, the panel assembly includes a metal panel main body, and the overflow sensor is concealed below the metal panel main body. Therefore, not only the panel assembly is easy to clean, but also it is possible to integrate the overflow sensor with the panel assembly, which facilitates assembly of the cooktop.

In a possible implementation, there are a plurality of overflow sensors, and the overflow sensors are arranged in an annular array around a center of the burner. A plurality of detection points may be formed around the burner by setting the overflow sensors at different positions, and overflows from different directions can be detected, which enables the overflow sensor to quickly detect the overflow state of the cooking utensil.

In a possible implementation, the plurality of overflow sensors are evenly distributed around the center of the burner. Therefore, regardless of which direction the fluid overflows from the cooking utensil, the overflow sensor can detect the overflow, which enables the overflow sensor to quickly and accurately detect the overflow state of the cooking utensil.

In a possible implementation, a determining unit includes a human body detection unit, and the human body detection unit is configured to detect whether there is a person around the cooktop. The overflow sensor does not work when the human body detection unit detects that there is a person around the cooktop, and the overflow sensor starts working when the human body detection unit detects that no person is around the cooktop. Therefore, when there is a person around the cooktop, the power can be freely controlled and the overflow sensor does not work, which can not only reduce energy consumption, but also not affect cooking. When there is no person around the cooktop, the cooking status cannot be monitored, and the overflow sensor works to reduce the trouble caused by the overflow, thereby improving the user experience.

In a possible implementation, the cooktop further includes a gas valve for adjusting a flow rate of gas supplied to the burner and a position sensor disposed on a knob of the gas valve and configured to detect whether a position of the knob of the gas valve changes. The overflow sensor does not work when the position sensor detects that the position of the knob of the gas valve changes within a specific period of time, and the overflow sensor starts working when the position sensor detects that the position of the knob of the gas valve does not change within a specific period of time. Therefore, during overflow detection, there may be man-made interference sometimes. The man-made interference most likely comes from artificially adjusting the power of the cooktop. The position sensor can detect whether the power of the cooktop has been adjusted artificially, so as to improve the accuracy of the overflow detection and further improve the user experience.

When the position of the knob of the gas valve changes within a specific period of time, it is determined that there is a person around the cooktop, and the overflow sensor is controlled not to work. The user can adjust the power as needed to obtain an expected cooking effect. When the position of the knob of the gas valve does not change within a specific period of time, it is determined that there is no person around the cooktop, and the overflow sensor is controlled to work, to reduce the occurrence of the overflow.

In a possible implementation, the overflow sensor includes a temperature sensor, and the temperature sensor is configured to detect a temperature change of the panel assembly to determine whether an overflow occurs.

In a possible implementation, the cooktop further includes a gas valve for adjusting a flow rate of gas supplied to the burner and a controller electrically connected to the gas valve and the overflow sensor, where the controller controls the gas valve to decrease power or switch off the gas valve when the overflow sensor detects an overflow. By using this structure, the temperature of the fluid in the cooking utensil can be reduced by the gas valve by decreasing the power or switching off the gas valve, which may quickly prevent the continuous occurrence of the overflow, and reduce the waste caused by the overflow and the impact on the cooktop.

In a possible implementation, the overflow sensor includes a temperature probe, where the temperature probe abuts against a lower surface of the panel assembly. The temperature probe is in contact with the panel assembly, and the temperature probe is seamlessly attached to the lower surface of the panel assembly, which can quickly and accurately measure the temperature change of the panel assembly, quickly determine whether there is an overflow, and improve the user experience.

In a possible implementation, the cooktop further includes an elastic structure member disposed around the overflow sensor, where the overflow sensor cooperates with the elastic structure member and is subject to an elastic force of the elastic structure member, and under the elastic force, the overflow sensor has a tendency to repel the panel assembly. In this way, the overflow sensor may be in close contact with the panel assembly, thereby improving the reliability and accuracy of overflow detection. In a possible implementation, the cooktop further includes a mounting bracket located below the panel assembly and used for mounting the overflow sensor, where the mounting bracket is provided with a plurality of mounting holes corresponding to the overflow sensor, and the overflow sensor passes through the mounting hole and abuts against the lower surface of the panel assembly. The overflow sensor is mounted on the panel assembly by using the mounting bracket, which facilitates mounting.

In a possible implementation, the cooktop further includes an elastic structure member disposed around the overflow sensor, where under an elastic force, the overflow sensor is movable along the mounting hole. In this way, the overflow sensor can move freely within a specific stroke under the elastic force of the elastic structure member.

In a possible implementation, the cooktop further includes an adjustment assembly for adjusting a distance between the overflow sensor and the panel assembly, so that the distance between the overflow sensor and the panel assembly can be adjusted by the adjustment assembly. In a later use process, if the overflow sensor is not attached to the panel assembly or the distance between the overflow sensor and the panel assembly is excessively large, the overflow sensor may be attached to the panel assembly through adjustment of the adjustment assembly, facilitating subsequent maintenance of the cooktop.

In a possible implementation, the cooktop further includes a mounting bracket located below the panel assembly and used for mounting the overflow sensor, where the adjustment assembly includes a threaded structure disposed on a lower surface of the panel assembly and a screw matching the threaded structure, and the screw is movable in the threaded structure to adjust the distance between the overflow sensor and the panel assembly. In this way, the distance between the overflow sensor and the panel assembly may be adjusted through matching between the screw and the threaded structure, facilitating subsequent adjustment of the distance between the overflow sensor and the panel assembly.

In a possible implementation, the cooktop further includes a mounting bracket located below the panel assembly and used for mounting the overflow sensor, where the mounting bracket is provided with a plurality of mounting holes corresponding to the overflow sensors, the overflow sensors pass through the mounting holes, and the adjustment assembly includes threaded structures respectively correspondingly disposed in the overflow sensor and the mounting hole. In this way, the distance between the overflow sensor and the panel assembly may be adjusted with the help of the threaded structure, facilitating subsequent adjustment of the distance between the overflow sensor and the panel assembly.

The present application further provides a panel assembly of a cooktop with overflow detection, including an overflow sensor, where the overflow sensor is configured to detect an overflow state of a cooking utensil, and the overflow sensor is concealed below the panel assembly.

An overflow sensor is concealed below the panel assembly, so that the overflow sensor is not exposed above the panel assembly. In this way, the panel assembly is relatively flat and easy to clean, and the overflow sensor can be better protected, thereby prolonging the service life of the overflow sensor.

In a possible implementation, the panel assembly includes a fluid pan and a metal panel main body disposed around the fluid pan, and the overflow sensor is concealed below the fluid pan and/or the metal panel main body, which facilitates the assembly of the overflow sensor.

In a possible implementation, the cooktop further includes an elastic structure member disposed around the overflow sensor, where the overflow sensor cooperates with the elastic structure member and is subject to an elastic force of the elastic structure member, and under the elastic force, the overflow sensor abuts below the panel assembly. The temperature probe is in contact with the panel assembly, and the temperature probe is seamlessly attached to the lower surface of the panel assembly, which can quickly and accurately measure the temperature change of the panel assembly, quickly determine whether there is an overflow, and improve the user experience.

Finally, the present application further provides a cooktop including the panel assembly as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is partial schematic diagram of a cooktop according to an embodiment of the present utility model;

FIG. 2 is partial schematic diagram of a cooktop according to another embodiment of the present utility model;

FIG. 3 is partial schematic diagram from another perspective according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of FIG. 3 from another perspective;

FIG. 5 is a partial schematic diagram from another perspective according to another embodiment of the present utility model; FIG. 6 is a partial schematic structural diagram of an overflow sensor and a casing pipe in FIG. 5;

FIG. 7 is a principle diagram of an electric appliance according to an embodiment of the present utility model; and

FIG. 8 is a flowchart of control according to an embodiment of the present utility model.

Reference numerals: Cooktop 1 Burner 20 Overflow sensor 30 Temperature probe 31 Panel assembly 40 Panel main body 41 Fluid pan 42 Knob 60 Mounting bracket 50 Mounting hole 51 Elastic structure Adjustment assembly member 52 53

Gas valve 70 Controller 80 Determining unit 90 Screw 54 Screw hole 55 Casing pipe 56 Overflow trigger switch 43

DETAILED DESCRIPTION

For a further understanding of the objectives, structures, features and functions of the present invention, a detailed description is made below in cooperation with embodiments.

Referring to FIG. 1 and FIG. 2, a cooktop 1 includes a panel assembly 40 and a burner 20 and a knob 60 of a gas valve that are disposed on the panel assembly 40. The burner 20 has an inner ring and an outer ring, and when the burner 20 burns, an inner ring flame and an outer ring flame are formed respectively. The gas valve 70 is a plug valve, and a user manually adjusts the knob 60 of the gas valve 70 to adjust a flow rate of gas supplied to the burner 20.

The cooktop 1 further includes an overflow sensor 30 configured to detect an overflow state of a cooking utensil, and the overflow sensor 30 is concealed below the panel assembly 40. That is, the overflow sensor 30 is disposed on a side of the panel assembly 40 facing the interior of the cooktop 1. The overflow sensor 30 is not exposed to the user when the user is cooking, which not only makes the panel assembly 40 look flat, easy to clean, and more aesthetic, but also makes the overflow sensor 30 be better protected, thereby prolonging the service life of the overflow sensor 30.

The panel assembly 40 includes a panel main body 41 and a fluid pan 42. The fluid pan 42 is located below the burner 20 and disposed around the burner. The fluid pan 42 is configured to receive a fluid spilled from the cooking utensil.

During cooking, when an overflow occurs, a size of an overflow region where a fluid flows out is different due to different sizes of the cooking utensils. The overflow region may be the fluid pan 42, or may be the panel main body 41, or may be the fluid pan 42 and the panel main body 41. The overflow sensor 30 is disposed within the scope of the overflow region, that is, the overflow sensor 30 is disposed on the fluid pan 42 and/or the panel main body 41.

In a possible embodiment, as shown in FIG. 1, the overflow sensor 30 may be concealed below the fluid pan 42, that is, the overflow sensor 30 is concealed on a side of the fluid pan 42 facing the interior of the cooktop 1. The overflow sensor 30 is represented in a dashed line. The overflow sensor 30 and the fluid pan 42 can be integrated together, which facilitates assembly and improves production efficiency.

In another possible embodiment, as shown in FIG. 2, the panel assembly 40 includes a metal panel main body 41, the overflow sensor 30 is concealed below the metal panel main body 41, that is, the overflow sensor 30 is concealed on a side of the metal panel main body 41 facing the interior of the cooktop 1. The overflow sensor 30 is represented in a dashed line. The overflow sensor 30 and the metal panel main body 41 can be integrated together, which facilitates assembly and improves production efficiency.

As shown in FIG. 1 and FIG. 2, there are a plurality of or N overflow sensors 30, and the plurality of overflow sensors 30 are arranged in an annular array around a center of the burner 20. By setting a plurality of sensors, regardless of which direction a fluid of the cooking utensil first overflows from, the overflow can be quickly detected, reducing the possibility of continuous fluid flow.

In a preferred embodiment, the plurality of overflow sensors 30 are evenly distributed around the center of the burner 20, that is, the plurality of overflow sensors 30 are distributed at an equal central angle, which is more conducive to accurately and quickly detecting an overflow state and further improves the user experience.

In an embodiment, a quantity of overflow sensors 30 is greater than or equal to 3. The quantity of overflow sensors 30 may also be 4, and are symmetrically disposed around the burner 20.

As shown in FIG. 3 to FIG. 5, the overflow sensor 30 includes a temperature probe 31, where the temperature probe 31 abuts against a lower surface of the panel assembly 40, that is, the temperature probe 31 abuts below the panel main body 41 and/or the fluid pan 42. During cooking, the temperature probe 31 is seamlessly attached to the lower surface of the panel assembly 40.

The cooktop 1 further includes an elastic structure member 52 disposed around the overflow sensor 30, and the elastic structure member 52 is connected to the overflow sensor 30. The elastic structure member 52 may be a spring piece, an elastic sheet, or the like. The overflow sensor 30 cooperates with the elastic structure member 52 and is subject to an elastic force of the elastic structure member 52, and under the elastic force, the overflow sensor 30 has a tendency to repel the panel assembly 40, so that the overflow sensor 30 is closely attached to the panel assembly 40.

The cooktop 1 further includes a mounting bracket 50 located below the panel assembly 40 and used for mounting the overflow sensor 30. The mounting bracket 50 is fixed on the lower surface of the panel assembly 40, and the mounting bracket 50 is fixed to the panel main body 41 and/or the fluid pan 42 by using a glue, a snap, or a screw.

As shown in FIG. 3 to FIG. 5, the mounting bracket 50 is provided with a plurality of mounting holes 51 corresponding to the plurality of overflow sensors 30, and the overflow sensors 30 abut against the panel assembly 40 through the mounting holes 51. The overflow sensor 30 can move with movement of the elastic structure member 52 within a specific range, and under an elastic force of a spring, the overflow sensor 30 is movable in a vertical direction along the mounting hole 51.

During the use of the cooktop 1, when there is a gap between the overflow sensor 30 and the panel assembly 40 or the panel assembly is not flat, under the elastic force of the elastic structure member 52, the overflow sensor 30 moves toward a direction of the panel assembly 40, so that the overflow sensor 30 is closely attached to the panel assembly 40. Therefore, regardless of whether the panel assembly 40 is flat, the overflow sensor 30 can be closely attached to the panel assembly 40.

As shown in FIG. 4 to FIG. 6, the cooktop 1 further includes an adjustment assembly 53 for adjusting a distance between the overflow sensor 30 and the panel assembly 40. During the use of the cooktop 1, if the overflow sensor 30 is not attached to the panel assembly 40 due to the elasticity of the elastic structure member 52 being weakened or other failures, the adjustment assembly 53 can be adjusted to shorten the distance between the overflow sensor 30 and the panel assembly 40, so that the overflow sensor 30 is closely attached to the panel assembly 40, which facilitates after-sales detection and maintenance.

In an embodiment, as shown in FIG. 4, an end of the elastic structure member 52 is connected to the overflow sensor 30, and an other end is connected to the panel assembly 40 which is close to the mounting hole 51. Under the action of the elastic force, the overflow sensor 30 is movable vertically along the mounting hole 51. The adjustment assembly 53 includes a threaded structure and a screw 54 matching the threaded structure that are disposed on the lower surface of the panel assembly 40. The mounting bracket 50 is provided with a screw hole 55 through which the screw 54 passes. The screw 54 passes through the screw hole 55 and matches the threaded structure, not only the mounting bracket 50 can be fixed to the panel assembly 40, but also the distance between the overflow sensor 30 and the panel assembly 40 can be adjusted through the vertically movement of the screw 54, so that the overflow sensor 30 can be re attached to the panel assembly 40.

In another embodiment, as shown in FIG. 5 and FIG. 6, the overflow sensor 30 is configured within an external threaded casing pipe 56 that is located in the mounting hole 51. An end of the elastic structure member 52 is connected to the external threaded casing pipe 56, and an other end is connected to the overflow sensor 30. Under the elastic force of the elastic structure member 52, the overflow sensor 30 is movable vertically within a specific range along the casing pipe 56. The mounting hole 51 on the mounting bracket 50 has an internal threaded structure matching an external threaded structure of the casing pipe 56. Through matching between the mounting hole 51 and the threaded structure of the casing pipe 56, not only the casing pipe 56 can be mounted to the mounting bracket 50, but also the casing pipe 56 can be movable vertically along the mounting hole 51. The distance between the overflow sensor 30 and the panel assembly 40 can be adjusted through the movement of the casing pipe 56, so that the overflow sensor 30 can be re-attached to the panel assembly 40.

The overflow sensor 30 is a temperature sensor, and the temperature sensor is configured to detect a temperature change of the panel assembly 40 to determine whether an overflow occurs. N temperature measurement points are set on the panel assembly 40, and a corresponding temperature sensor is configured for each temperature measurement point to detect temperature changes. A quantity of temperature measurement points corresponds to a quantity of overflow sensors 30, and N is greater than or equal to 3.

As shown in FIG. 7, the cooktop 1 further includes a controller 80, and the controller 80 is electrically connected to the overflow sensor 30 and the gas valve 70. The controller 80 is configured to receive temperature values of the N temperature measurement points of the panel assembly 40 detected by the temperature sensor, and calculate a temperature difference of a temperature change of each temperature measurement point.

The controller 80 is configured such that: a temperature difference threshold is pre-stored in the controller 80, the received temperature difference of the temperature measurement point is compared with the temperature difference threshold, and a quantity n of the temperature measurement points whose temperature differences exceed the temperature difference threshold is calculated. The controller 80 sends out different indication information according to a value of the quantity n to adjust gas output of the burner 20.

When the overflow occurs, the temperature change of the panel assembly 40 is relatively obvious, there is a temperature measurement point whose temperature difference exceeds the temperature difference threshold, and it may be accurately determined whether the overflow occurs, to avoid the continuous overflow.

As shown in FIG. 7, the cooktop 1 further includes a determining unit 90 configured to determine whether there is a person around the cooktop 1. The determining unit 90 is electrically connected to the controller 80 and is configured to send detected information to the controller 80.

The determining unit 90 may include a human body detection unit, and the human body detection unit is configured to detect whether there is a person around the cooktop 1.

The human body detection unit includes an infrared temperature sensor. The overflow sensor 30 does not work when the human body detection unit detects that there is a person around the cooktop 1, and the overflow sensor 30 starts working when the human body detection unit detects that no person is around the cooktop 1.

The determining unit 90 may further include a position sensor disposed on the knob 60 of the gas valve 70, and the position sensor is configured to detect whether a position of the knob 60 of the gas valve 70 changes within a specific period of time to determine whether there is a person around the cooktop 1. When the position of the knob 60 of the gas valve 70 changes within a specific period of time, it is determined that there is a person around the cooktop 1, and the overflow sensor 30 does not work. When the position of the knob 60 of the gas valve 70 does not change within a specific period of time, it is determined that there is no person around the cooktop 1, and the overflow sensor 30 starts working. The position sensor includes a resistor or an encoder.

As shown in FIG. 8, the controller 80 is further configured such that:

When a quantity n=N, temperatures of all temperature measurement points have changed. When the determining unit 90 determines that there is a person around the cooktop 1, the controller 80 sends out indication information to control the gas valve 70 not to act; and when the determining unit 90 determines that no person is around the cooktop 1, the controller 80 sends out indication information to control the gas valve 70 to decrease power or switch off the gas valve 70.

When a quantity n=0, there is no temperature change at the temperature measurement points, and the controller 80 sends out indication information to control the gas valve 70 not to act.

When quantity N > n > 0, the controller 80 sends out indication information to control the gas valve 70 to decrease power or switch off the gas valve 70.

Therefore, when no temperature difference of the temperature measurement point exceeds the temperature difference threshold, it is determined that no overflow occurs, and the gas valve 70 does not act. When the temperature differences of not all the temperature measurement points exceed the temperature difference threshold, regardless of whether there is a person around the cooktop 1, it is determined that an overflow occurs, and the gas valve 70 is controlled to decrease power or the gas valve 70 is switched off. When the temperature differences of all the temperature measurement points exceed the threshold, if there is a person around the cooktop 1, the cooktop 1 may be operated artificially, for example, the power is artificially increased, and it is necessary to make corresponding instructions depending on whether there is a person is around the cooktop 1.

This may not only ensure the cooking effect, but also reduce the occurrence of an overflow, so that the home appliance system is more intelligent, thereby bringing greater convenience to users, better maintaining the home environment, and improving the user experience.

The cooktop 1 further includes an overflow trigger switch disposed on the panel assembly 40. The overflow trigger switch is electrically connected to the controller 80. The overflow trigger switch includes a button or a touch key.

The controller 80 is further configured such that: when the overflow trigger switch is triggered and the quantity n>0, the controller 80 sends out indication information to control the gas valve 70 to decrease power or switch off the gas valve 70.

Therefore, when the user needs to leave the kitchen or has no time to take care of the cooktop 1 even if the user is in the kitchen, the user needs to only turn on the overflow trigger switch. When a temperature difference of a temperature measurement point exceeds the temperature difference threshold, an overflow state is determined, and the gas valve 70 is controlled to decrease power or the gas valve 70 is switched off, to better improve the user experience.

Various embodiments illustrated with reference to FIG. 1 to FIG. 8 may be combined with each other in any given manner to realize the advantage of the present utility model. In addition, the present utility model is not limited to the shown embodiments. Usually, apart from the shown means, other means can also be used as long as the means can also achieve the same effect.

Claims

CLAIMS What is claimed is:

1. A cooktop (1) with overflow detection, comprising: a panel assembly (40); a burner (20) disposed on the panel assembly (40); an overflow sensor (30), configured to detect an overflow state of a cooking utensil; and characterized in that the overflow sensor (30) is concealed below the panel assembly (40).

2. The cooktop (1) according to claim 1, characterized in that the panel assembly (40) comprises a fluid pan (42); the fluid pan (42) is located below the burner (20) and is disposed around the burner (20); and the overflow sensor (30) is concealed below the fluid pan (42).

3. The cooktop (1) according to claim 1, characterized in that the panel assembly (40) comprises a metal panel main body, and the overflow sensor (30) is concealed below the metal panel main body.

4. The cooktop (1) according to claim 1, characterized in that there are a plurality of overflow sensors (30), and the overflow sensors (30) are arranged in an annular array around a center of the burner (20).

5. The cooktop (3) according to claim 1, characterized in that the plurality of overflow sensors (30) are evenly distributed around the center of the burner (20).

6. The cooktop (1) according to claim 1, characterized by further comprising a determining unit (90), wherein the determining unit (90) is configured to determine whether there is a person around the cooktop (1); the overflow sensor (30) does not work when the determining unit (90) detects that there is a person around the cooktop (1), and the overflow sensor (30) starts working when the determining unit (90) detects that no person is around the cooktop (1).

7. The cooktop (1) according to claim 1, characterized by further comprising a gas valve (70) for adjusting a flow rate of gas supplied to the burner (20) and a position sensor disposed on a knob (60) of the gas valve (70) and configured to detect whether a position of the knob (60) of the gas valve (70) changes, wherein the overflow sensor (30) does not work when the position sensor detects that the position of the knob (60) of the gas valve (70) changes within a specific period of time, and the overflow sensor (30) starts working when the position sensor detects that the position of the knob (60) of the gas valve (70) does not change within a specific period of time.

8. The cooktop (1) according to claim 1, characterized in that the overflow sensor (30) comprises a temperature sensor, and the temperature sensor is configured to detect a temperature change of the panel assembly (40) to determine whether an overflow occurs.

9. The cooktop (1) according to claim 1, characterized by further comprising a gas valve (70) for adjusting a flow rate of gas supplied to the burner (20) and a controller electrically connected to the gas valve (70) and the overflow sensor (30), wherein the controller controls the gas valve (70) to decrease power or switch off the gas valve (70) when the overflow sensor (30) detects an overflow.

10. The cooktop (1) according to claim 1, characterized in that the overflow sensor (30) comprises a temperature probe (31), wherein the temperature probe (31) abuts against a lower surface of the panel assembly (40).

11. The cooktop (1) according to claim 1 or 10, characterized by further comprising an elastic structure member (52) disposed around the overflow sensor (30), wherein the overflow sensor (30) cooperates with the elastic structure member (52) and is subject to an elastic force of the elastic structure member (52), and under the elastic force, the overflow sensor (30) has a tendency to repel the panel assembly (40).

12. The cooktop (1) according to claim 1 or 10, characterized by further comprising a mounting bracket (50) located below the panel assembly (40) and used for mounting the overflow sensor (30), wherein the mounting bracket (50) is provided with a plurality of mounting holes (51) corresponding to the overflow sensors (30), and the overflow sensors (30) pass through the mounting holes (51) and abut against the lower surface of the panel assembly (40).

13. The cooktop (11) according to claim 1, characterized by further comprising an elastic structure member (52) disposed around the overflow sensor (30), wherein under an elastic force, the overflow sensor (30) is movable along the mounting hole (51).

14. The cooktop (1) according to claim 1, characterized by further comprising an adjustment assembly (53) for adjusting a distance between the overflow sensor (30) and the panel assembly (40).

15. The cooktop (13) according to claim 1, characterized by further comprising a mounting bracket (50) located below the panel assembly (40) and used for mounting the overflow sensor (30), wherein the adjustment assembly (53) comprises a threaded structure disposed on a lower surface of the panel assembly (40) and a screw matching the threaded structure, and the screw is movable in the threaded structure to adjust the distance between the overflow sensor (30) and the panel assembly (40).

16. The cooktop (13) according to claim 1, characterized by further comprising a mounting bracket (50) located below the panel assembly (40) and used for mounting the overflow sensor (30), wherein the mounting bracket (50) is provided with a plurality of mounting holes (51) corresponding to the overflow sensor (30), the overflow sensor (30) passes through the mounting hole (51), and the adjustment assembly (53) comprises threaded structures respectively correspondingly disposed in the overflow sensor (30) and the mounting hole (51).

17. A panel assembly (40) of a cooktop (1) with overflow detection, characterized by comprising an overflow sensor (30), wherein the overflow sensor is configured to detect an overflow state of a cooking utensil, and the overflow sensor (30) is concealed below the panel assembly (40).

18. The panel assembly (40) according to claim 17, characterized in that the panel assembly (40) comprises a fluid pan (42) and a metal panel main body disposed around the fluid pan (42), and the overflow sensor (30) is concealed below the fluid pan (42) and/or the metal panel main body.

19. The panel assembly (40) according to claim 17, characterized in that the overflow sensor (30) comprises a temperature sensor, and the temperature sensor is configured to detect a temperature change of the panel assembly (40) to determine whether an overflow occurs.

20. The panel assembly (40) according to claim 17, characterized in that an elastic structure member (52) disposed around the overflow sensor (30), wherein the overflow sensor (30) cooperates with the elastic structure member (52) and is subject to an elastic force of the elastic structure member (52), and under the elastic force, the overflow sensor (30) abuts below the panel assembly (40).

21. A cooktop (1), characterized by comprising the panel assembly (40) according to any one of claims 17 to 20.