Stove

Abstract

The utility model provides a kitchen range, relates to the technical field of overflow protection and dry burning prevention of electric appliances, and can accurately detect whether liquid overflows from a pot heated on the kitchen range or not. The kitchen range comprises an overflow detection device. The overflow detection device comprises a processor, at least one detection electrode group and a reference capacitor. And the first electrode, the second electrode and a medium between the first electrode and the second electrode in the detection electrode group form equivalent capacitance. The processor is configured to charge and discharge the reference capacitor and the detection electrode group according to a preset frequency to obtain the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor; and obtaining the capacitance value of the equivalent capacitor according to the charging and discharging characteristics of the reference capacitor, the charging and discharging characteristics of the equivalent capacitor and the capacitance value of the reference capacitor. And under the condition that the variable quantity of the capacitance value of the equivalent capacitor corresponding to the at least one detection electrode group exceeds a preset range, the fuel gas conveying valve is controlled to be closed or partially closed.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow protection and dry burning prevention of electrical appliances, in particular to a stove. Background Art

[0002] In people's daily life, we cannot do without the use of stoves. When the pot is heated on the stove for too long, the liquid in the pot may overflow due to violent boiling, increasing safety hazards.

[0003] In order to detect liquid overflow in time, the prior art often uses a temperature sensor disposed at a stove head to measure the temperature of the liquid in the pot, and when it is determined that the liquid has reached boiling, the fire of the stove is controlled to be turned off.

[0004] However, since cooking pots are made of different materials and have different heating curves, using a temperature sensor to detect overflow may result in a detection lag, resulting in a large error in overflow detection. Utility Model Content

[0005] The embodiment of the utility model provides a stove, which can accurately detect whether a pot heated on the stove overflows liquid.

[0006] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0007] The stove provided in the present application comprises a stove base, a stove head, a gas delivery pipeline, a gas delivery valve and an overflow detection device. The stove head is arranged on the stove base, and the gas delivery pipeline is connected to the stove head. The gas delivery valve is arranged in the gas delivery pipeline. The overflow detection device comprises a processor connected to the gas delivery valve, at least one detection electrode group and a reference capacitor. The detection electrode group is connected to the processor. The detection electrode group is arranged on a side of the stove base away from the stove head, and the detection electrode group comprises a first electrode and a second electrode arranged oppositely, the orthographic projection of the first electrode on the stove base is located outside the orthographic projection of the stove head on the stove base, and the orthographic projection of the second electrode on the stove base is located on a side of the orthographic projection of the first electrode on the stove base away from the orthographic projection of the stove head on the stove base. The capacitance value of the reference capacitor is a known value, and both ends of the reference capacitor are electrically connected to the processor. Among them, the first electrode, the second electrode in the detection electrode group and the medium between the first electrode and the second electrode form an equivalent capacitor. The processor is configured to charge and discharge the reference capacitor and the detection electrode group according to a preset frequency, obtain the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor, and obtain the capacitance value of the equivalent capacitor according to the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor and the capacitance value of the reference capacitor. When the change in the capacitance value of the equivalent capacitor corresponding to at least one detection electrode group exceeds a preset range, the gas delivery valve is controlled to be closed or partially closed.

[0008] The detection electrode group is arranged on the side of the stove base away from the stove head, and the first electrode, the second electrode and the medium between the first electrode and the second electrode form an equivalent capacitor. The processor charges and discharges the reference capacitor and the detection electrode group according to the preset frequency to obtain the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor, and obtains the capacitance value of the equivalent capacitor according to the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor and the capacitance value of the reference capacitor. The capacitance value is basically unchanged under normal circumstances, and when the pot is heated on the stove head, once the liquid inside the pot boils and overflows, the overflowed liquid falls between the first electrode and the second electrode, which will cause the medium of the equivalent capacitor formed between the first electrode and the second electrode to change, thereby causing the charge and discharge characteristics and capacitance value of the equivalent capacitor to change. Once the change in the capacitance value of the equivalent capacitor exceeds the preset range, it means that the liquid in the pot has overflowed. At this time, the processor controls the gas delivery valve to close to prevent potential dangers and ensure the safety of the user. And. Since the devices used are all conventional electronic devices, accurate overflow detection can be achieved at low cost.

[0009] As a possible implementation, the overflow detection device includes a detection electrode group. The first electrode of the detection electrode group is annular, and the orthographic projection of the first electrode on the stove base surrounds the orthographic projection of the stove head on the stove base. The second electrode of the detection electrode group is annular, and the orthographic projection of the second electrode on the stove base surrounds the orthographic projection of the first electrode on the stove base.

[0010] As a possible implementation, the overflow detection device includes a plurality of detection electrode groups. The first electrodes of the plurality of detection electrode groups are arranged in a ring shape and are arranged at intervals, and the orthographic projections of the plurality of first electrodes on the stove base surround the orthographic projections of the stove head on the stove base. The second electrodes of the plurality of detection electrode groups are arranged in a ring shape and are arranged at intervals, and the orthographic projections of the plurality of second electrodes on the stove base surround the orthographic projections of the plurality of first electrodes on the stove base.

[0011] As a possible implementation, the stove also includes a third electrode and a grounding system, the third electrode is arranged on a side of the stove base away from the stove head, the orthographic projection of the third electrode on the stove base is located on a side where the orthographic projection of the detection electrode group on the stove base is away from the orthographic projection of the stove head on the stove base, or the orthographic projection of the third electrode on the stove base is located on a side where the orthographic projection of the detection electrode group on the stove base is close to the orthographic projection of the stove head on the stove base, and the third electrode is electrically connected to the grounding system.

[0012] As a possible implementation, the overflow detection device also includes a plurality of resistor groups, the resistor group includes a first resistor and a second resistor. The processor includes a plurality of pin groups, the pin group includes a first pin and a second pin. A detection electrode group, a resistor group and a pin group are connected correspondingly, and in the correspondingly connected detection electrode group, resistor group and pin group, the first electrode is electrically connected to the first end of the first resistor, and the second end of the first resistor is electrically connected to the first pin of the processor. The second electrode is electrically connected to the first end of the second resistor, and the second end of the second resistor is electrically connected to the second pin of the processor. The processor also includes a third pin and a fourth pin, the first pole of the reference capacitor is electrically connected to the third pin of the processor, and the second pole of the reference capacitor is electrically connected to the fourth pin of the processor.

[0013] As a possible implementation, the first electrode is disposed on a side of the stove base away from the stove head through adhesive. The second electrode is disposed on a side of the stove base away from the stove head through adhesive.

[0014] As a possible implementation manner, the width of the first electrode is 10-15 mm, and the width of the second electrode is 10-15 mm.

[0015] As a possible implementation manner, the distance between the first electrode and the second electrode is 3-7 mm.

[0016] As a possible implementation manner, the thickness of the stove base is less than or equal to 6 mm.

[0017] As a possible implementation manner, the first electrode and the second electrode are arranged on one side of the printed circuit board, and a mesh metal wire is arranged on the other side of the printed circuit board.

[0018] As a possible implementation manner, a metal structural part is provided on the stove head, and the gas delivery valve is a metal valve.

[0019] As a possible implementation, the overflow detection device is provided with a heat insulating casing.

[0020] As a possible implementation, the stove also includes an explosion-proof membrane arranged on a side surface of the stove base away from the stove head, the explosion-proof membrane has a hollow area, and the hollow area corresponds to the detection electrode group and the first interval between the first electrode and the second electrode of the detection electrode group. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0022] Figure 1 A schematic diagram of a stove provided in an embodiment of the present application;

[0023] Figure 2 A side view of a stove provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the composition of an overflow detection device provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the back structure of a stove provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of the back structure of another stove provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the back structure of another stove provided in an embodiment of the present application;

[0028] Figure 7a A schematic diagram of the back structure of another stove provided in an embodiment of the present application;

[0029] Figure 7b A schematic diagram of the back structure of another stove provided in an embodiment of the present application;

[0030] Figure 8A schematic diagram of the internal connection of an overflow detection device provided in an embodiment of the present application;

[0031] Fig. 9 A schematic diagram of the internal connection of another overflow detection device provided in an embodiment of the present application;

[0032] Fig.10 Another internal connection diagram of an overflow detection device is provided for an embodiment of the present application;

[0033] Fig.11 Another internal connection diagram of an overflow detection device is provided for an embodiment of the present application;

[0034] Fig.12 A side view of another stove provided in an embodiment of the present application;

[0035] Fig.13 A side view of another stove provided in an embodiment of the present application;

[0036] Fig.14 A partial structural schematic diagram of an overflow detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The embodiments of the utility model are described in detail below with reference to the accompanying drawings.

[0038] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] In the present application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, ab, ac, bc or abc, where a, b and c can be single or multiple. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. In addition, in the embodiments of the present application, the words "first", "second" and the like do not limit the quantity and execution order.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0042] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0043] In people's daily life, the use of stoves is indispensable. For example, Figure 1 As shown, the stove includes a stove base 1, a stove head 2, a gas delivery pipeline 3, and a gas delivery valve 4. The gas delivery pipeline 3 is usually provided with a gas delivery valve 4, and the opening and closing of the gas delivery valve 4 can control whether gas fuels such as artificial coal gas, liquefied petroleum gas, and natural gas are output to the stove head 2.

[0044] Combination Figure 1 The stove is also provided with a switch knob 5, which can control the ignition and shutoff of the stove 2 and the size of the flame generated on the stove 2. For example, when the switch knob 5 is turned to the ON position, that is, the ON state, the stove 2 is ignited. When the switch knob 5 is turned to the OFF position, that is, the OFF state, the stove 2 is shut off. When the switch knob 5 is gradually rotated from the ON position to the other side of the OFF position, the opening degree of the gas delivery valve 4 is also continuously increased, the volume of gas fuels such as artificial coal gas, liquefied petroleum gas, and natural gas passing through the gas delivery pipeline 3 is also increasing, and the flame generated on the stove 2 is also gradually getting bigger.

[0045] Exemplary, combined Figure 1When the user is cooking, he rotates the switch knob 5 on the stove to the on state and places the pot to be cooked on the stove head 2. At this time, the gas delivery valve 4 is converted from a closed state to an open state, so that gas fuels such as artificial gas, liquefied petroleum gas, and natural gas can be delivered to the stove head 2 through the output port of the gas delivery pipeline 3, and ignited by the ignition nozzle on the stove head 2. The stove head 2 is successfully ignited and a flame is generated.

[0046] After the stove 2 is ignited successfully, the gas delivery valve 4 remains in an open state, and gas fuels such as artificial coal gas, liquefied petroleum gas, and natural gas need to be continuously output to the stove 2 through the output port of the gas delivery pipeline 3 to ensure that the flame on the stove 2 has sufficient fuel supply. When the gas delivery valve 4 is opened more, the supply of gas fuels such as artificial coal gas, liquefied petroleum gas, and natural gas is greater, and the firepower is stronger. When the gas delivery valve 4 is closed more, the supply of gas fuels such as artificial coal gas, liquefied petroleum gas, and natural gas is less, and the firepower is weaker.

[0047] When the user finishes cooking, he turns the switch knob 5 on the cooker to the off state. The gas delivery valve 4 is switched from the open state to the closed state, blocking the delivery of gas fuels such as artificial gas, liquefied petroleum gas, and natural gas to the output port of the gas delivery pipeline 3, and the flame on the cooker head 2 is extinguished.

[0048] During the entire process of heating the pot, the liquid in the pot will gradually approach the boiling point as the heating time increases, and eventually reach the boiling point. Generally speaking, when the liquid in the pot reaches the boiling point, the switch knob can be turned to the OFF position to turn off the fire, but the user may forget to turn off the switch knob, causing the liquid in the pot to continue to boil. In this case, it is very likely to cause the liquid in the pot to overflow, and the liquid in the pot will overflow onto the stove base and contaminate the stove base. When the liquid overflow continues for a long time and the user still does not turn off the switch knob, the liquid in the pot may be burned dry, which is very likely to cause damage to the pot. As the amount of liquid overflowing on the stove base increases, the safety risks also increase greatly.

[0049] Therefore, whether the stove can accurately detect whether the pot heated on the stove is overflowing with liquid and automatically adjust the firepower when liquid overflows has become an important criterion for measuring whether the stove is intelligent.

[0050] At present, the method of setting a temperature sensor at the stove head of the stove to detect the overflow of the heating pot is generally adopted. The temperature sensor collects the temperature of the pot and judges the state of the liquid inside the pot according to the collected temperature, judging whether the liquid inside the pot is in a boiling state, and adjusting the size of the stove fire.

[0051] However, the temperature sensor is set on the stove, which will inevitably be affected by the flame of the stove, and its accuracy is questionable. In addition, due to the different materials of the pots heated on the stove, their heating curves are also different. For example, the casserole has a nonlinear and irregular change because the material of the casserole has the property of heat storage. When the temperature sensor determines that the liquid in the casserole has reached a boiling state and then turns to low heat, it is likely that overflow has occurred.

[0052] In view of this, the present application provides a stove, exemplarily as Figure 2 As shown, Figure 2 A side view of a stove provided in an embodiment of the present application. Figure 2 and Figure 1 The stove provided in the present application has an overflow detection device 6 in addition to the traditional stove base 1, stove head 2, gas delivery pipeline 3, gas delivery valve 4 and switch knob 5.

[0053] The stove head 2 is arranged on the stove base 1, and the gas delivery pipeline 3 is connected to the stove head 2. The gas delivery valve 4 is arranged in the gas delivery pipeline 3. The overflow detection device 6 is a core device for realizing overflow detection of the heating pot on the stove head 2.

[0054] For example, Figure 3 As shown, Figure 3 The components of the overflow detection device are shown. Figure 3 The overflow detection device includes a processor 61 connected to the gas delivery valve, at least one detection electrode group 62 and a reference capacitor 63. The detection electrode group 62 is connected to the processor 61, and the reference capacitor 63 is connected to the processor 61.

[0055] Reference Figure 4 , Figure 4 The back structure of a stove provided by an embodiment of the present application is shown. The detection electrode group 62 is arranged on the side of the stove base 1 away from the stove head 2, that is, the detection electrode group 62 is arranged on the back of the stove. The detection electrode group 62 includes a first electrode 621 and a second electrode 622 arranged opposite to each other, the orthographic projection of the first electrode 621 on the stove base 1 is located outside the orthographic projection of the stove head 2 on the stove base 1, and the orthographic projection of the second electrode 622 on the stove base 1 is located on the side of the orthographic projection of the first electrode 621 on the stove base 1 away from the orthographic projection of the stove head 2 on the stove base 1.

[0056] The capacitance value of the reference capacitor 63 is a known value, and both ends of the reference capacitor 63 are electrically connected to the processor 61. The first electrode 621, the second electrode 622 in the detection electrode group 62 and the medium between the first electrode 621 and the second electrode 622 form an equivalent capacitor. The processor 61 is configured to charge and discharge the reference capacitor 63 and the detection electrode group 62 at a preset frequency, obtain the charge and discharge characteristics of the reference capacitor 63, and the charge and discharge characteristics of the equivalent capacitor, and obtain the capacitance value of the equivalent capacitor according to the charge and discharge characteristics of the reference capacitor 63 and the charge and discharge characteristics of the equivalent capacitor, and the capacitance value of the reference capacitor 63. When the change in the capacitance value of the equivalent capacitor corresponding to at least one detection electrode group 62 exceeds a preset range, the gas delivery valve 4 is controlled to be closed or partially closed.

[0057] The detection electrode group is arranged on the side of the stove base away from the stove head, and the first electrode, the second electrode and the medium between the first electrode and the second electrode form an equivalent capacitor. The processor charges and discharges the reference capacitor and the detection electrode group according to the preset frequency to obtain the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor, and obtains the capacitance value of the equivalent capacitor according to the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor and the capacitance value of the reference capacitor. The capacitance value is basically unchanged under normal circumstances, but when the pot is heated on the stove head, once the liquid inside the pot boils and overflows, the overflowed liquid falls between the first electrode and the second electrode, which will cause the medium of the equivalent capacitor formed between the first electrode and the second electrode to change, thereby causing the charge and discharge characteristics and capacitance value of the equivalent capacitor to change. Once the change in the capacitance value of the equivalent capacitor exceeds the preset range, it means that the liquid in the pot has overflowed. At this time, the processor controls the gas delivery valve to close or partially close, blocking the delivery of gas or reducing the firepower to prevent potential dangers and ensure the safety of users. And. Since the devices used are all conventional electronic devices, accurate overflow detection can be achieved at a low cost.

[0058] It should be noted that the equivalent capacitance will change according to the difference in the medium between the first electrode and the second electrode. For example, when the stove base is made of glass, the capacitance medium of the equivalent capacitance formed between the first electrode and the second electrode includes glass, and the dielectric constant of glass is 5 to 10. When liquid, such as water, overflows from the pot, the capacitance medium of the equivalent capacitance formed between the first electrode and the second electrode includes glass and water. The dielectric of water at different temperatures is also different. For example, the dielectric constant of water at 80°C is 60.9, and the dielectric constant of water at 20°C is 80.2. These will cause differences in the charging and discharging characteristics and capacitance values ​​of the equivalent capacitance.

[0059] In some embodiments, Figure 4As shown, the overflow detection device includes a detection electrode group. The first electrode 621 of the detection electrode group is annular, and the orthographic projection of the first electrode 621 on the stove base 1 surrounds the orthographic projection of the stove head 2 on the stove base 1. The second electrode 622 of the detection electrode group is annular, and the orthographic projection of the second electrode 622 on the stove base 1 surrounds the orthographic projection of the first electrode 621 on the stove base 1.

[0060] Since the first electrode 621 is annular, the second electrode 622 is annular, and the orthographic projection of the first electrode 621 on the stove base 1 surrounds the orthographic projection of the stove head 2 on the stove base 1, and the orthographic projection of the second electrode 622 on the stove base 1 surrounds the orthographic projection of the first electrode 621 on the stove base 1, the processor charges and discharges the reference capacitor and the detection electrode group according to the preset frequency, and can calculate the capacitance value of the equivalent capacitance in the entire annular area between the first electrode 621 and the second electrode 622 through the known capacitance value of the reference capacitor. When the overflowed liquid falls into any position in the annular area, the capacitance value of the equivalent capacitance will change. Once the change in the capacitance value of the equivalent capacitance exceeds the preset range, the processor will control the gas delivery valve to close. Therefore, the setting of "encircling" the first electrode and the second electrode on the back of the stove base can more comprehensively and accurately detect the overflow.

[0061] For example, Figure 5 As shown, the first electrode and the second electrode can also be arranged in a "non-enclosed" manner on the back of the stove base (which is also equivalent to the surrounding arrangement described below), and the present application does not impose any restrictions on this. However, it should be noted that no matter whether the first electrode and the second electrode can be arranged in a "non-enclosed" manner or a "enclosed" manner on the back of the stove base, the positional relationship between the first electrode, the second electrode and the stove head is the same.

[0062] It should be noted that "the orthographic projection of the first electrode 621 on the stove base 1 surrounds the orthographic projection of the stove head 2 on the stove base 1. The second electrode 622 of the detection electrode group is annular, and the orthographic projection of the second electrode 622 on the stove base 1 surrounds the orthographic projection of the first electrode 621 on the stove base 1", which means that there is a certain distance between the orthographic projection of the first electrode on the stove base and the orthographic projection of the stove head on the stove base, and there is a certain distance between the second electrode and the first electrode. For example, the distance between the second electrode and the first electrode is Figure 4 The white ring area between the first electrode 621 and the second electrode 622 is shown.

[0063] In some embodiments, the overflow detection device includes a plurality of detection electrode groups. Figure 6As shown, the first electrodes 621 of the plurality of detection electrode groups are arranged in a ring shape and are spaced apart, and the orthographic projections of the plurality of first electrodes 621 on the cooker base 1 surround the orthographic projections of the cooker head 2 on the cooker base 1. The second electrodes 622 of the plurality of detection electrode groups are arranged in a ring shape and are spaced apart, and the orthographic projections of the plurality of second electrodes on the cooker base 1 surround the orthographic projections of the plurality of first electrodes 621 on the cooker base 1.

[0064] Reference Figure 6 , Figure 6 Only two detection electrode groups, the first detection electrode group and the second detection electrode group, are used as examples for illustration. In practical applications, there may be more detection electrode groups. The first detection electrode group includes a first electrode 621-a and a second electrode 622-a. The second detection electrode group includes a first electrode 621-b and a second electrode 622-b. The first electrode 621-a in the first detection electrode group and the second electrode 622-a in the first detection electrode group are arranged in a ring shape and spaced apart. The first electrode 621-b in the second detection electrode group and the second electrode 622-b in the second detection electrode group are arranged in a ring shape and spaced apart.

[0065] It should be noted that “the orthographic projections of the multiple first electrodes 621 on the stove base 1 surround the orthographic projection of the stove head 2 on the stove base 1. The second electrodes 622 of the multiple detection electrode groups are arranged in a ring shape and are set at intervals, and the orthographic projections of the multiple second electrodes on the stove base 1 surround the orthographic projections of the multiple first electrodes 621 on the stove base 1”, which means that there is a certain interval between the orthographic projection of the first electrode 621 on the stove base 1 and the orthographic projection of the stove head 2 on the stove base 1, and there is a certain interval between the second electrode and the first electrode.

[0066] As a possible implementation, combining Figure 7a and Figure 7b As shown, the stove further includes a third electrode 623 and a grounding system. The third electrode 623 is disposed on a side of the stove base 1 away from the stove head 2. The orthographic projection of the third electrode 623 on the stove base 1 is located on a side of the orthographic projection of the detection electrode group on the stove base 1 away from the orthographic projection of the stove head 2 on the stove base 1. Figure 7a Or the orthographic projection of the third electrode 623 on the stove base 1 is located on the side where the orthographic projection of the detection electrode group on the stove base 1 is close to the orthographic projection of the stove head 2 on the stove base 1, as shown in FIG. Figure 7b The third electrode 623 is electrically connected to the grounding system. In the application, the installation position of the third electrode can be determined according to the actual effect, that is, according to the accuracy of overflow detection and the effect of preventing dry burning.

[0067] The orthographic projection of the third electrode 623 on the stove base 1 is located on the side of the orthographic projection of the detection electrode group on the stove base 1 away from the orthographic projection of the stove head 2 on the stove base 1, which means that there is a certain interval between the third electrode 623 and the detection electrode group, such as Figure 7b The third electrode 623 is shown as a white circle area between the third electrode 623 and the second electrode 622. The third electrode 623 is electrically connected to the grounding system of the cooker to shield the influence of electromagnetic interference, thereby improving the accuracy of the overflow detection device for detecting the overflow of liquid in the pot, and is suitable for the cooker to be set in a scene with large electromagnetic interference.

[0068] For example, when there is only one detection electrode group, the internal connection diagram of the overflow detection device is as follows: Figure 8 As shown. The overflow detection device also includes a resistor group 7, and the resistor group 7 includes a first resistor 71 and a second resistor 72. The processor 61 includes a pin group 610, and the pin group 610 includes a first pin 61-1 and a second pin 61-2. The processor 61 also includes a third pin 61-3 and a fourth pin 61-4, and the first electrode of the reference capacitor 63 is electrically connected to the third pin 61-3 of the processor 61, and the second electrode of the reference capacitor 63 is electrically connected to the fourth pin 61-4 of the processor 61. The first electrode 621 is electrically connected to the first end of the first resistor 71, and the second end of the first resistor 71 is electrically connected to the first pin 61-1 of the processor 61. The second electrode 622 is electrically connected to the first end of the second resistor 72, and the second end of the second resistor 72 is electrically connected to the second pin 61-2 of the processor 61.

[0069] As a possible implementation, the overflow detection device further includes a plurality of resistor groups, the resistor groups include a first resistor and a second resistor. The processor includes a plurality of pin groups, the pin groups include a first pin and a second pin. A detection electrode group, a resistor group and a pin group are connected correspondingly.

[0070] For example, when there are multiple detection electrode groups, the internal connection diagram of the overflow detection device is as follows: Fig. 9 shown. Fig. 9 As for Figure 6 The following is an example of setting two detection electrode groups. Figure 6 and Fig. 9 The first detection electrode group includes a first electrode 621-a and a second electrode 622-a. The second detection electrode group includes a first electrode 621-b and a second electrode 622-b.

[0071] The resistor group 7 includes a first resistor group 7a and a second resistor group 7b. The first resistor group 7a includes a first resistor 71 and a second resistor 72. The second resistor group 7b includes a third resistor 73 and a fourth resistor 74. The pin group 610 of the processor 61 includes a first pin group 610a and a second pin group 610b. The first pin group 610a includes a first pin 61-1 and a second pin 61-2. The second pin group 610b includes a fifth pin 61-5 and a sixth pin 61-6.

[0072] The processor 61 further includes a third pin 61 - 3 and a fourth pin 61 - 4 . The first electrode of the reference capacitor 63 is electrically connected to the third pin 61 - 3 of the processor 61 , and the second electrode of the reference capacitor 63 is electrically connected to the fourth pin 61 - 4 of the processor 61 .

[0073] The first electrode 621-a in the first detection electrode group is electrically connected to the first end of the first resistor 71 in the first resistor group 7a, and the second end of the first resistor 71 is electrically connected to the first pin 61-1 in the first pin group 610a of the processor 61. The second electrode 622-a in the first detection electrode group is electrically connected to the first end of the second resistor 72 in the first resistor group 7a, and the second end of the second resistor 72 is electrically connected to the second pin 61-2 in the first pin group 610a of the processor 61.

[0074] Similarly, the first electrode 621-b in the second detection electrode group is electrically connected to the first end of the third resistor 73 in the second resistor group 7b, and the second end of the third resistor 73 is electrically connected to the fifth pin 61-5 in the second pin group 610b of the processor 61. The second electrode 622-b in the second detection electrode group is electrically connected to the first end of the fourth resistor 74 in the second resistor group 7b, and the second end of the fourth resistor 74 is electrically connected to the sixth pin 61-6 in the second pin group 610b of the processor 61.

[0075] When there are multiple detection electrode groups, the processor charges and discharges the reference capacitor and the detection electrode group at a preset frequency. Specifically, each branch where each detection electrode group is located is charged and discharged in turn at an extremely fast frequency. Since each branch where each detection electrode group is located corresponds to a pin group, the processor can obtain equivalent capacitance values ​​corresponding to multiple detection electrode groups, which represent the equivalent capacitance between each detection electrode group.

[0076] Reference Figure 6 and Fig. 9For example, when the overflowed liquid falls on the area corresponding to the first electrode 621-a and the second electrode 622-a of the first detection electrode group, the capacitance value of the equivalent capacitance of the first detection electrode group detected by the first pin group 610-a of the processor will change, and the change in the capacitance value of the equivalent capacitance exceeds the preset range. Similarly, when the overflowed liquid falls on the area corresponding to the first electrode 621-b and the second electrode 622-b of the second detection electrode group, the capacitance value of the equivalent capacitance of the second detection electrode group detected by the second pin group 610-b of the processor will change, and the change in the capacitance value of the equivalent capacitance exceeds the preset range.

[0077] In order to enable the processor to charge and discharge the first electrode, the second electrode and the reference capacitor according to a preset frequency, the processor is also connected to a crystal oscillator circuit, which provides a clock for the processor. Fig.10 As shown, the crystal oscillator circuit 64 includes a crystal oscillator 641 and a first capacitor 642. The first pin 641-1 of the crystal oscillator 641 is electrically connected to the first electrode of the first capacitor 642, and the second electrode of the first capacitor 642 is grounded GND. The first pin 641-1 of the crystal oscillator 641 is also electrically connected to the seventh pin 61-7 of the processor 61, the second pin 641-2 of the crystal oscillator 641 is grounded GND, the third pin 641-3 of the crystal oscillator 641 is grounded GND, and the fourth pin 641-4 of the crystal oscillator 641 is grounded GND. As a possible implementation, the crystal oscillator 641 is a passive crystal oscillator.

[0078] In some embodiments, Fig.11 As shown, the processor 61 further includes an eighth pin 61-8, a ninth pin 61-9, a tenth pin 61-10, an eleventh pin 61-11 and a twelfth pin 61-12. The eighth pin 61-8 of the processor 61 is connected to the ground GND. The ninth pin 61-9 of the processor 61 is electrically connected to the first electrode of the second capacitor 65, and the second electrode of the second capacitor 65 is connected to the ground GND. The tenth pin 61-10 of the processor 61 is electrically connected to the first electrode of the third capacitor 66, and the second electrode of the third capacitor 66 is connected to the ground GND.

[0079] The eleventh pin 61-11 of the processor 61 is grounded GND. The ninth pin 21-9 of the processor 61 is grounded GND. The twelfth pin 61-12 of the processor 61 is connected to the first voltage terminal VCC, and is also electrically connected to the first electrode of the fourth capacitor 67, and the second electrode of the fourth capacitor 67 is grounded. The first voltage terminal VCC provides power for the processor 61 to ensure the normal operation of the processor 61.

[0080] As a possible implementation, Fig.12As shown, the overflow detection device 6 is connected to the stove base 1 by an adhesive 7. Specifically, the first electrode is arranged on the side of the stove base 1 away from the stove head 2 by the adhesive 7. The second electrode is arranged on the side of the stove base 1 away from the stove head 2 by the adhesive 7. The overflow detection device 6 is connected to the stove base 1 by the adhesive 7, so that there is no air gap between the first electrode, the second electrode and the stove base 1, which is conducive to reducing the consistency difference of the distance between the first electrode, the second electrode and the stove base 1. The air gap and consistency difference will affect the consistency of the detection, resulting in poor consistency of the detection, and even cause false triggering.

[0081] In some embodiments, the thickness of the stove base is less than or equal to 6 mm. If the thickness of the stove base exceeds 6 mm, the detected signal amplitude will be too small, resulting in a decrease in the signal-to-noise ratio, which will affect the normal determination of the system.

[0082] As a possible implementation method, the overflow detection device should be kept at a distance of more than 10 cm from the ignition and high-frequency working parts of the stove to prevent the electromagnetic radiation generated by the ignition and high-frequency working parts from affecting the normal operation of the overflow detection device. If this requirement cannot be met, a metal shielding component should be installed near the overflow detection device, or a metal shielding layer such as aluminum foil should be attached to the surface of the overflow detection device to shield the interference signal.

[0083] For example, Fig.13 As shown, a metal structure 21 is provided on the stove head 2, and the gas delivery valve 4 is a metal valve. The provision of the metal structure 21 and the replacement of the gas delivery valve 4 with a metal valve can reduce the influence of electromagnetic radiation on the accuracy of the overflow detection device.

[0084] As a possible implementation, the width of the first electrode is 10-15 mm, and the width of the second electrode is 10-15 mm. Exemplarily, the width of the first electrode is 10 mm, and the width of the second electrode is 10 mm. Exemplarily, the width of the first electrode is 15 mm, and the width of the second electrode is 15 mm. Exemplarily, the width of the first electrode is 12 mm, and the width of the second electrode is 12 mm. If the width of the first electrode and / or the second electrode is too small, the induced capacitance will be reduced, affecting the detection accuracy. If it is too large, it will occupy too much area and the cost will be high.

[0085] As a possible implementation, the distance between the first electrode and the second electrode is 3-7 mm. Exemplarily, the distance between the first electrode and the second electrode is 3 mm. Exemplarily, the distance between the first electrode and the second electrode is 7 mm. Exemplarily, the distance between the first electrode and the second electrode is 5 mm. When the distance between the first electrode and the second electrode is too small, the overflowed liquid may fall outside the interval of the two electrode envelopes, affecting the detection accuracy. When the distance between the first electrode and the second electrode is too large, the detected capacitance change will be too small, resulting in a reduced signal-to-noise ratio, prone to false triggering, and a larger detection error.

[0086] As a possible implementation, for example, Fig.14 As shown, the first electrode and the second electrode are arranged on one side of the printed circuit board 8, and a mesh metal wire 81 is arranged on the other side of the printed circuit board 8. When the cooker is used in a scene with a lot of metal, the arrangement of the mesh metal wire 81 can reduce the influence of metal interference on the accuracy of the overflow detection device.

[0087] As a possible implementation method, the overflow detection device is provided with a heat-insulating shell. The setting of the heat-insulating shell can isolate the high temperature generated by the stove burner when it is working, and avoid failure of the processor and the detection electrode group. In some embodiments, the heat-insulating shell made of heat-insulating material is to control the temperature inside the overflow detection device at 80°C or below to improve the accuracy and consistency of detection. If the 80°C requirement cannot be met, it is necessary to additionally set up a temperature sensor to detect the temperature inside the overflow detection device. The temperature sensor is connected to the processor for temperature compensation for the overflow detection device. The processor in the overflow detection device adjusts the threshold and sensitivity of the capacitance detection according to the current temperature to realize the detection function.

[0088] As a possible implementation, the stove also includes an explosion-proof membrane arranged on the surface of one side of the stove base away from the stove head, and the explosion-proof membrane has a hollowed-out area, and the hollowed-out area corresponds to the detection electrode group and the area where the first interval between the first electrode and the second electrode of the detection electrode group is located. The explosion-proof membrane contains metal substances, which will shield the signals of the electrodes and cannot achieve normal detection, so the explosion-proof membrane is not attached to the area corresponding to the overflow detection device. In addition, since the detection electrode group is attached to the stove base by flexible glue (adhesive glue), the flexible glue can also play an explosion-proof role and does not affect the explosion-proof function and performance of the product. The explosion-proof membrane chooses whether to be grounded according to the actual effect in the application. As a possible implementation, the explosion-proof membrane is connected to the grounding system of the stove.

[0089] In the several embodiments provided in the present application, it should be understood that the units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0090] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A cooking appliance, characterized in that: include: Cooker base; Cooking stove; Set on the stove base: A gas delivery pipeline connected to the stove; A gas delivery valve, arranged in the gas delivery pipeline; Overflow detection device, comprising: a processor connected to the gas delivery valve; at least one detection electrode group, the detection electrode group being connected to the processor; the detection electrode group being arranged on a side of the stove base away from the stove head, the detection electrode group comprising a first electrode and a second electrode arranged opposite to each other, the orthographic projection of the first electrode on the stove base being located outside the orthographic projection of the stove head on the stove base, and the orthographic projection of the second electrode on the stove base being located on a side of the orthographic projection of the first electrode on the stove base away from the orthographic projection of the stove head on the stove base; A reference capacitor, wherein the capacitance of the reference capacitor is a known value, and both ends of the reference capacitor are electrically connected to the processor; Wherein, the first electrode, the second electrode in the detection electrode group and the medium between the first electrode and the second electrode form an equivalent capacitor; The processor is configured to: charge and discharge the reference capacitor and the detection electrode group at a preset frequency to obtain the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor, and obtain the capacitance value of the equivalent capacitor based on the charge and discharge characteristics of the reference capacitor and the charge and discharge characteristics of the equivalent capacitor, as well as the capacitance value of the reference capacitor; and control the gas delivery valve to be closed or partially closed when the change in the capacitance value of the equivalent capacitor corresponding to at least one detection electrode group exceeds a preset range.

2. The cooker according to claim 1, characterized in that: The overflow detection device includes a detection electrode group; The first electrode of the detection electrode group is in a ring shape, and the orthographic projection of the first electrode on the stove base surrounds the orthographic projection of the stove head on the stove base; The second electrode of the detection electrode group is in a ring shape, and the orthographic projection of the second electrode on the cooker base surrounds the orthographic projection of the first electrode on the cooker base.

3. The cooker according to claim 1, characterized in that: The overflow detection device includes a plurality of detection electrode groups; The first electrodes of the plurality of detection electrode groups are arranged in a ring shape and are spaced apart, and the orthographic projections of the plurality of first electrodes on the stove base surround the orthographic projection of the stove head on the stove base; The second electrodes of the plurality of detection electrode groups are arranged in a ring shape and are disposed at intervals, and the orthographic projections of the plurality of second electrodes on the cooker base surround the orthographic projections of the plurality of first electrodes on the cooker base.

4. The cooker according to any one of claims 1 to 3, characterized in that: The cooker further comprises a third electrode and a grounding system. The third electrode is arranged on a side of the stove base away from the stove head, and the orthographic projection of the third electrode on the stove base is located on a side where the orthographic projection of the detection electrode group on the stove base is away from the orthographic projection of the stove head on the stove base, or the orthographic projection of the third electrode on the stove base is located on a side where the orthographic projection of the detection electrode group on the stove base is close to the orthographic projection of the stove head on the stove base; The third electrode is electrically connected to the grounding system.

5. The cooker according to claim 1, characterized in that: The overflow detection device further comprises a plurality of resistor groups, wherein the resistor groups comprise a first resistor and a second resistor; The processor comprises a plurality of pin groups, wherein the pin groups comprise a first pin and a second pin; One of the detection electrode groups, one of the resistor groups and one of the pin groups are connected correspondingly, and among the correspondingly connected detection electrode groups, the resistor groups and the pin groups, The first electrode is electrically connected to a first end of the first resistor, and a second end of the first resistor is electrically connected to a first pin of the processor; The second electrode is electrically connected to a first end of the second resistor, and a second end of the second resistor is electrically connected to a second pin of the processor; The processor further includes a third pin and a fourth pin, the first electrode of the reference capacitor is electrically connected to the third pin of the processor, and the second electrode of the reference capacitor is electrically connected to the fourth pin of the processor.

6. The cooker according to any one of claims 1 to 3, characterized in that: The first electrode is arranged on a side of the stove base away from the stove head by adhesive; The second electrode is arranged on a side of the stove base away from the stove head by adhesive.

7. The cooker according to any one of claims 1 to 3, characterized in that: The width of the first electrode is 10-15 mm, and the width of the second electrode is 10-15 mm.

8. The cooker according to any one of claims 1 to 3, characterized in that: The distance between the first electrode and the second electrode is 3-7 mm.

9. The cooker according to any one of claims 1 to 3, characterized in that: The thickness of the stove base is less than or equal to 6 mm.

10. The cooker according to any one of claims 1 to 3, characterized in that: The first electrode and the second electrode are arranged on one side of a printed circuit board, and a mesh metal line is arranged on the other side of the printed circuit board.

11. The cooker according to any one of claims 1 to 3, characterized in that: The stove head is provided with a metal structural part, and the gas delivery valve is a metal valve.

12. The cooker according to any one of claims 1 to 3, characterized in that: The overflow detection device is provided with a heat insulating housing.

13. The cooker according to any one of claims 1 to 3, characterized in that: The stove also includes an explosion-proof membrane arranged on a side surface of the stove base away from the stove head, the explosion-proof membrane has a hollow area, and the hollow area corresponds to the detection electrode group and the first interval between the first electrode and the second electrode of the detection electrode group.

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