Cooking utensil and pot-free detection method

Abstract

The invention provides a cooking utensil and a pot-free detection method, and relates to the technical field of household appliances. The cooking utensil comprises a shell, a circuit board is arranged in the shell, and the shell is provided with a mounting opening; the panel is arranged at the mounting opening, and the panel is provided with a heating area; the furnace plate assembly is arranged in the shell; the stove plate assembly comprises a stove plate main body and a heating piece, and the heating piece is connected with the stove plate main body; the heating piece corresponds to the heating area and is electrically connected with the circuit board; the induction polar plate is arranged on one side, close to the panel, of the furnace plate main body; an oscillating circuit is integrated on the circuit board, and the induction polar plate is electrically connected with the circuit board. The detection mode is not only suitable for rapid detection of conductive metal cookware, but also can rapidly and effectively identify non-conductive non-metal cookware, so that the user experience is improved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a cooking utensil and a method for detecting a pot-less cooking utensil. Background Art

[0002] Cooking utensils are widely used in people's daily lives to cook food. Take the electric ceramic stove as an example. The electric ceramic stove includes a heating element and a panel. The heating element is located under the panel. The heat generated by the heating element can heat the pots placed on the panel. Since the surface temperature of the panel is as high as about 600℃ when the electric ceramic stove is heated, if the electric ceramic stove is started for heating when the pot is not placed on the panel, it is easy to cause power consumption due to no-burning, and even cause safety hazards.

[0003] Therefore, the electric ceramic stove needs to be equipped with a pot detection function. In the related art, the principle of the inductive touch switch is used, that is, when the conductive metal pot is close to the induction coil, the induction capacitance formed by the metal pot and the ground is connected in parallel with the induction capacitance formed by the induction coil and the ground, so that the total induction capacitance increases. After the detection circuit detects the change in the induction capacitance value, it can identify whether there is a pot on the panel or not.

[0004] However, the above detection method can only detect conductive metal cookware, and cannot well identify and detect non-metallic cookware that is not conductive. Summary of the invention

[0005] The present application provides a cooking utensil and a pot-free detection method, which is not only suitable for the rapid detection of conductive metal cookware, but also can quickly and effectively identify non-conductive non-metallic cookware, thereby improving the detection accuracy of the cookware and enhancing the user experience.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] In a first aspect, the present application provides a cooking utensil, comprising: a shell, a circuit board is arranged in the shell, and the shell has an installation opening; a panel, the panel is arranged at the installation opening, and the panel is provided with a heating zone; a stove plate assembly, the stove plate assembly is arranged in the shell; the stove plate assembly comprises a stove plate body and a heating element, and the heating element is connected to the stove plate body; the heating element is arranged corresponding to the heating zone, and the heating element is electrically connected to the circuit board; an induction plate, the induction plate is arranged on a side of the stove plate body close to the panel; the circuit board is provided with an oscillation circuit, and the induction plate is electrically connected to the circuit board.

[0008] The cooking utensil provided by the present application is electrically connected to the circuit board by setting the induction plate. When the induction plate is energized, a capacitor is formed and a stable electrostatic field is formed around it. Any object approaching or entering this electric field will affect the capacitance value of the capacitor and cause the change of the amplitude of the oscillation circuit. Therefore, the present application can effectively determine whether there is a pot on the identification panel according to the change of the amplitude of the oscillation circuit. The detection method of the present application is not only applicable to conductive metal pots, but also can quickly and effectively identify non-conductive non-metallic pots, thereby improving the detection accuracy of pots of different materials and improving the user experience.

[0009] In a possible implementation, the sensing plate includes an insulating substrate and a conductive layer, the conductive layer is disposed on at least one side of the insulating substrate, and the conductive layer is electrically connected to the circuit board.

[0010] Thus, by including an insulating substrate, the insulating substrate helps to separate the conductive layers and prevent short circuits between the conductive layers, thereby ensuring the normal operation of the capacitor. By providing a conductive layer, an electric field can be formed when power is applied, and when current passes through the capacitor, this electric field can help store energy, that is, realize the charging and discharging process of the capacitor, thereby helping to meet the needs of different capacitors.

[0011] In a possible implementation, the conductive layer includes a first conductive layer and a second conductive layer, and the first conductive layer and the second conductive layer are respectively disposed on opposite sides of the insulating substrate; the first conductive layer and the second conductive layer are respectively electrically connected to the circuit board.

[0012] In this way, on the one hand, this structure enables the double-layer capacitor to charge and discharge in a short time and provide high power output; on the other hand, the double-layer structure can provide a larger surface area, which helps to increase the charge storage capacity and thus increase the capacitance of the capacitor; on the other hand, the double-layer capacitor has a good charging and discharging speed and can be charged and discharged quickly. In addition, the double-layer capacitor has good voltage stability and can maintain a relatively stable output voltage.

[0013] In a possible implementation manner, a distance between the first conductive layer and the second conductive layer is h, where 1 mm≤h≤2 mm.

[0014] In this way, a reasonable distance is created between the first conductive layer and the second conductive layer. On the one hand, the capacity of the capacitor can be effectively increased, and the performance of the capacitor can be optimized so that it can store more charge. On the other hand, it helps to maintain a stable operating voltage of the capacitor, avoiding the problem of excessive electric field strength due to being too close or weakened electric field strength due to being too far, thereby protecting the capacitor from damage and increasing its service life. On the other hand, it helps to optimize the charge and discharge characteristics of the capacitor so that it can maintain stable performance during rapid charge and discharge. On the other hand, by controlling the distance between the first conductive layer and the second conductive layer, the risk of internal short circuit in the capacitor can be reduced, thereby improving its safety.

[0015] In a possible implementation manner, the conductive layer is disposed on one side of the insulating substrate, and the circuit board is provided with a ground terminal; the conductive layer and the ground terminal form a loop.

[0016] This helps to achieve low-cost detection functions.

[0017] In a possible implementation manner, an orthographic projection of the conductive layer in the thickness direction is located within the range of the insulating substrate; wherein an outer edge of the conductive layer is spaced apart from an inner edge of the insulating substrate.

[0018] In this way, a wider insulating substrate can provide more space for the conductive layer, helping to increase the effective area of ​​the electrode; in addition, a narrower conductive layer can reduce the current density, thereby helping to reduce the risk of local overheating, and help ensure good contact between the conductive layer and the insulating substrate, thereby reducing contact resistance and avoiding performance degradation due to poor contact.

[0019] In a possible implementation, the sensing electrode further includes a protective layer, wherein the protective layer covers a surface of the conductive layer; and the protective layer has pin holes for exposing the conductive layer.

[0020] This helps prevent the first conductive layer and the second conductive layer from directly contacting and conducting each other, thereby avoiding the risk of short circuit of the conductive layer to the greatest extent and improving the safety performance of the sensing plate.

[0021] This helps prevent the two conductive layers from directly contacting and conducting each other, thereby minimizing the risk of short circuiting the conductive layers and improving the safety performance of the sensing plate.

[0022] In a possible implementation, the cooking appliance further includes a mounting bracket, wherein the mounting bracket is disposed on the stove plate body, and the induction plate is disposed on a side of the mounting bracket facing the panel.

[0023] In this way, the induction plate is fixed on the furnace plate body through the mounting bracket, which helps to improve the assembly stability of the induction plate and further ensure the normal operation of the induction plate.

[0024] In this way, the induction plate is fixed on the furnace plate body through the mounting bracket, which helps to improve the assembly stability of the induction plate and further ensure the normal operation of the induction plate.

[0025] In a possible implementation, a positioning groove is provided on a side of the mounting bracket facing the panel, and the sensing electrode is arranged in the positioning groove; the positioning groove is provided with a positioning notch, and the sensing electrode has a protrusion, the protrusion is opposite to the positioning notch, and the protrusion at least partially protrudes out of the positioning groove; the protrusion abuts against the positioning notch.

[0026] This helps to further improve the assembly stability of the sensing plate and the mounting bracket, thereby ensuring the normal operation of the sensing plate.

[0027] In a possible implementation, the cooking appliance includes an elastic member, a partial structure of which is disposed between the stove plate assembly and the mounting bracket, and the elastic member is configured to apply a force toward the panel to the mounting bracket so that the induction plate abuts against the panel.

[0028] In this way, the elastic member can provide a force for the mounting bracket to abut against the panel, so that the induction plate can be close to the panel, thereby maximizing the accuracy of the induction plate in detecting whether there is a cookware on the panel.

[0029] In a possible implementation, a fixing column is provided at the bottom of the shell, a first mounting portion is provided on the furnace plate body, a second mounting portion is provided on the mounting bracket, the first mounting portion and the second mounting portion correspond to the fixing column, and the fixing column can be passed through the first mounting portion to be connected to the second mounting portion; the elastic member is located between the first mounting portion and the second mounting portion, and is sleeved on the fixing column.

[0030] In this way, the fixing column can be used to provide a guide for a part of the structure of the elastic member, so as to reduce the possibility of distortion of the elastic member during deformation along the thickness direction of the shell. In addition, it helps to improve the assembly stability and assembly strength of the shell, the furnace plate body and the mounting bracket.

[0031] In a second aspect, the present application provides a method for detecting a pot-free state, the method comprising: powering on the cooking appliance and putting it in a standby state; detecting changes in the amplitude of an oscillation circuit through a detection circuit; determining whether the amplitude of the oscillation circuit exceeds a preset range; if the amplitude of the oscillation circuit exceeds the preset range, determining that a pot is placed on the panel, and issuing an unlocking instruction to the heating element to unlock the heating function of the heating element; if the amplitude of the oscillation circuit is within the preset range, determining that no pot is placed on the panel, and the cooking appliance remains in a standby state.

[0032] In this way, the induction plate is electrically connected to the oscillation circuit, and the change in the amplitude of the oscillation circuit is used to determine whether there is a cookware on the identification panel. This is not only suitable for conductive metal cookware, but also for non-conductive non-metallic cookware, which can be quickly and effectively identified, thereby improving the detection accuracy of cookware of different materials and enhancing user experience.

[0033] In a possible implementation, after determining that a pot is placed on the panel and issuing an unlocking instruction to the heating element, the method further includes: starting the heating element according to a user instruction; when the cooking utensil is in a heating state, determining whether the pot is located in a heating zone of the panel; if the pot is moved out of the heating zone of the panel, the cooking utensil is in a pause state and the heating element is controlled to stop heating; if the pot is moved into the heating zone of the panel, the cooking utensil resumes the heating state.

[0034] This will help improve the intelligence of cooking appliances, enhance user experience, and reduce energy consumption due to idle burning and even the possibility of safety hazards.

[0035] In a possible implementation, after the cooking appliance is in the pause state, the method further includes: if it is detected that the pot has moved into the heating zone of the panel, the pause state of the cooking appliance ends and the heating element is controlled to continue heating.

[0036] In this way, after the pot is moved out of the panel to put the cooking utensil into a paused state, when the user moves the pot into the heating area of ​​the panel again, the amplitude of the oscillation circuit exceeds the preset range, and the circuit board can issue an unlocking instruction to the heating element, at which time the user can start the heating element to continue heating.

[0037] The cooking utensil and the method for detecting a pot without a pot provided by the present application are electrically connected to the oscillating circuit by setting the induction plate. After the induction plate is energized, a capacitor is formed and a stable electrostatic field is formed around it. Any object approaching or entering this electric field will affect the capacitance value of the capacitor and cause the change of the amplitude of the oscillating circuit. Therefore, the present application can effectively judge whether there is a pot on the identification panel according to the change of the amplitude of the oscillating circuit. The detection method of the present application is not only suitable for the rapid detection of conductive metal pots, but also can quickly and effectively identify non-conductive non-metallic pots, thereby improving the detection accuracy of pots of different materials and improving the user experience.

[0038] The structure of the present application and its other application objects and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 A schematic diagram of the three-dimensional structure of a cooking utensil provided in an embodiment of the present application;

[0041] Figure 2 A front view of a cooking utensil provided by an embodiment of the present application;

[0042] Figure 3 A cross-sectional view of a cooking utensil provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the internal structure of a cooking utensil provided in an embodiment of the present application;

[0044] Figure 5 An exploded schematic diagram of a cooking utensil provided in an embodiment of the present application;

[0045] Figure 6 A schematic diagram of the structure of a cooking plate assembly, a mounting bracket and an induction plate of a cooking appliance provided in an embodiment of the present application;

[0046] Figure 7 A schematic diagram of the structure of the sensing plate provided in the embodiment of the present application;

[0047] Figure 8 for Figure 7 A partial enlarged schematic diagram of part I;

[0048] Fig. 9An exploded schematic diagram of the induction plate provided in an embodiment of the present application;

[0049] Fig.10 A cross-sectional view of the sensing plate provided in an embodiment of the present application;

[0050] Fig.11 A top view provided for an embodiment of the present application;

[0051] Fig.12 A schematic diagram of the structure of the mounting bracket provided in the embodiment of the present application;

[0052] Fig.13 A schematic diagram of the assembly structure of the mounting bracket and the furnace plate assembly provided in an embodiment of the present application;

[0053] Fig.14 for Fig.13 A partial enlarged schematic diagram of part II;

[0054] Fig.15 A schematic diagram of the induction detection principle of the induction plate provided in an embodiment of the present application;

[0055] Fig.16 A control logic diagram of a method for detecting a pot-free environment provided in an embodiment of the present application;

[0056] Fig.17 A schematic flow chart of the no-pot detection method provided in an embodiment of the present application.

[0057] Description of reference numerals:

[0058] 100-cooking utensils;

[0059] 110-housing; 111-installation opening; 112-fixing column;

[0060] 120- panel; 121- heating zone; 130- stove assembly;

[0061] 131- furnace plate body; 132- heating element; 133- first mounting portion;

[0062] 140-circuit board; 150-sensing plate; 151-insulating substrate;

[0063] 152-first conductive layer; 153-second conductive layer; 154-protective layer;

[0064] 155-pin hole; 156-protrusion; 160-mounting bracket;

[0065] 161 - positioning groove; 162 - positioning notch; 163 - second mounting portion;

[0066] 170-elastic member; 171-first elastic member; 172-second elastic member;

[0067] 180-Thermal limiter. DETAILED DESCRIPTION

[0068] Some of the current electric ceramic stove products do not have a pot-free detection function, and dry burning is very likely to occur during use, posing a great safety hazard; some products are equipped with an induction pot-free detection function, which achieves pot-free detection through an induction coil without a closed loop.

[0069] The current principle of no-pot detection is: there is an inductive capacitance between any conductive objects. An inductive coil and the earth can form an inductive capacitance. When the surrounding environment remains unchanged, the inductive capacitance value is a fixed small value. When a metal object approaches the inductive coil, the inductive capacitance formed by the metal object and the earth is connected in parallel with the inductive capacitance formed by the inductive coil and the earth, which will increase the total inductive capacitance value. After the detection circuit detects that the inductive capacitance value on the inductive path has changed, it can identify and determine whether there is a pot on the panel. However, the above detection method can only detect conductive metal pots, and cannot well identify and detect non-metallic pots that cannot conduct electricity.

[0070] Based on the above technical problems, the embodiments of the present application provide a cooking utensil and a method for detecting a pot-free pot. By setting an induction plate to be electrically connected to an oscillating circuit, a capacitor is formed after the induction plate is energized, and a stable electrostatic field is formed around it. Any object approaching or entering this electric field will affect the capacitance value of the capacitor and cause a change in the amplitude of the oscillating circuit. Therefore, the present application can effectively determine whether there is a pot on the identification panel based on the change in the amplitude of the oscillating circuit. Moreover, the detection method of the present application is not only suitable for the rapid detection of conductive metal pots, but also can quickly and effectively identify non-conductive non-metallic pots, thereby improving the detection accuracy of pots of different materials and improving the user experience.

[0071] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0072] The present application embodiment provides a cooking utensil 100, which includes but is not limited to an induction cooker and an electric ceramic cooker. In the present embodiment, the electric ceramic cooker is mainly used as an example of the cooking utensil 100. The pot is placed on the electric ceramic cooker, and the electric ceramic cooker is used to cook the food in the pot.

[0073] Reference Figures 1 to 6 As shown, the cooking device 100 may include a housing 110 and a panel 120. The housing 110 has a mounting opening 111, and the panel 120 is disposed at the mounting opening 111. The panel 120 is used to carry the pot. Figure 1 As shown, a heating area 121 may be provided on the panel 120 , and when the user places the cookware on the heating area 121 , the cookware may be heated.

[0074] In the embodiment of the present application, the material of the shell 110 can be polypropylene (PP), polybutylene terephthalate (PBT), polyester resin (PET), nylon 6 (PA6), nylon 66 (PA66) or polyphenylene sulfide (PPS) with a temperature resistance greater than 125 degrees, or the material of the shell 110 can be PP, PBT, PET, PA6, PA66 or PPS plus glass fiber.

[0075] In the embodiment of the present application, the panel 120 can be made of a high temperature resistant non-metallic material, such as a borosilicate glass panel, a ceramic panel, and a microcrystalline glass panel. This embodiment does not limit this, and the specific material can be selected according to actual needs.

[0076] Reference Figures 3 to 6 As shown, a circuit board 140, a stove plate assembly 130 and an induction plate 150 are provided in the shell 110. The stove plate assembly 130 may include a stove plate body 131 and a heating element 132. The heating element 132 is connected to the stove plate body 131. The heating element 132 is arranged corresponding to the heating zone 121, and the heating element 132 is electrically connected to the circuit board 140.

[0077] In the embodiment of the present application, when the cooking utensil 100 is an induction cooker, the heating element 132 is a coil disk; when the cooking utensil 100 is an electric ceramic stove, the heating element 132 is an electric ceramic disk. In the present embodiment, the heating element 132 is mainly described as an electric ceramic disk.

[0078] In the embodiment of the present application, the connection mode between the heating element 132 and the stove plate body 131 is not limited. Exemplarily, the stove plate body 131 may include a bottom wall and a side wall connected to each other. The heating element 132 may be arranged on the bottom wall of the stove plate body 131. The side wall of the stove plate body 131 may be surrounded to form a closed annular structure to form a receiving cavity with the bottom wall. In this way, it is helpful to improve the protection of the heating element 132. This embodiment does not limit this.

[0079] In the embodiment of the present application, the heating element 132 is arranged to correspond to the heating zone 121. In this way, when the cookware is placed in the heating zone 121, the circuit board 140 can control the heating element 132 to start heating. The heating element 132 can heat the cookware so that the heat can be concentrated on the cookware, thereby avoiding energy consumption caused by heat loss.

[0080] In the embodiment of the present application, the induction plate 150 can be arranged on a side of the stove plate body 131 close to the panel 120. There is no limitation on the assembly method between the induction plate 150 and the stove plate body 131, and it can be arranged according to actual needs. In addition, the induction plate 150 is arranged on a side close to the panel 120, so that when the pot is placed in the heating zone 121, the distance between the induction plate 150 and the pot is close, which helps to reduce the interference between the induction plate 150 and the pot, and further helps to improve the detection accuracy of the pot.

[0081] Among them, in order to solve the problem that the detection method in the related art can only detect conductive metal cookware, and cannot identify and detect non-metallic cookware that cannot conduct electricity well. In the embodiment of the present application, the circuit board 140 can be integrated with an oscillation circuit, and the induction plate 150 is electrically connected to the circuit board 140. In this way, the induction plate 150 forms a capacitor after being energized, and forms a stable electrostatic field around it. Any object approaching or entering this electric field will affect the capacitance value of the capacitor and cause the change of the amplitude of the oscillation circuit. Therefore, the present application can effectively determine whether there is a cookware on the identification panel 120 according to the change of the amplitude of the oscillation circuit. Moreover, the detection method of the present application is not only applicable to conductive metal cookware, but also can quickly and effectively identify non-conductive non-metallic cookware, thereby improving the detection accuracy of cookware of different materials and improving user experience.

[0082] It should be noted that the reason for this setting is that Fig.15 As shown, the working principle of the present application is: the induction plate 150 forms a capacitor after being energized. When the whole machine is in the state and the surrounding environment remains unchanged, its capacitance value remains fixed. This fixed capacitance value corresponds to a certain amplitude of the oscillation circuit. At the same time, an electrostatic field is formed around the capacitor. Any object entering the range of this electric field will affect this electric field, thereby changing this capacitance. The change in capacitance eventually leads to a change in the amplitude of the oscillation circuit. Among them, since the change in capacitance is small, it is difficult to detect this change, while the change in the oscillation circuit can be amplified. Therefore, the change in the amplitude of the oscillation circuit is detected by the detection circuit to determine whether there is a pot on the identification panel 120 and give an indication and feedback signal through the output circuit.

[0083] It should be noted that the oscillating circuit is integrated on the circuit board 140, is a part of the circuit board 140, and belongs to the detection system. It is understandable that the detection system of this embodiment can include various electronic components such as resistors, capacitors, diodes, etc.

[0084] In one possible implementation, referring to Figures 7 to 9As shown, the sensing plate 150 may include an insulating substrate 151 and a conductive layer. The conductive layer is disposed on at least one side of the insulating substrate 151 , and the conductive layer is electrically connected to the circuit board 140 .

[0085] In the embodiment of the present application, the number and location of the conductive layer are not limited. For example, the conductive layer can be provided only on one side of the insulating substrate 151; or, the conductive layer can be provided on two opposite sides of the insulating substrate 151. This embodiment does not limit this.

[0086] In the embodiment of the present application, the materials of the insulating substrate 151 and the conductive layer are not limited. For example, the insulating substrate 151 can be made of ceramic, glass, polyethylene, polypropylene and other materials; the conductive layer can be made of conductive polymer, activated carbon, metal oxide and other materials. This embodiment does not limit this.

[0087] In the embodiment of the present application, there is no limitation on the electrical connection method between the conductive layer and the oscillating circuit. For example, the conductive layer and the oscillating circuit may be electrically connected via a wire; or, the conductive layer and the oscillating circuit may be wirelessly connected. This embodiment does not limit this, and the connection may be made according to actual conditions.

[0088] Thus, by including the insulating substrate 151, the insulating substrate 151 helps to separate the conductive layers and prevent short circuits between the conductive layers, thereby ensuring the normal operation of the capacitor. By providing the conductive layer, an electric field can be formed when power is turned on. When current passes through the capacitor, this electric field can help store energy, that is, realize the charging and discharging process of the capacitor, thereby helping to meet the needs of different capacitors.

[0089] In one possible implementation, referring to Figure 8 and Fig. 9 As shown, the conductive layer may include a first conductive layer 152 and a second conductive layer 153 , which are respectively disposed on opposite sides of the insulating substrate 151 ; the first conductive layer 152 and the second conductive layer 153 are respectively electrically connected to the circuit board 140 .

[0090] In this way, the capacitor is a double-layer capacitor. On the one hand, this structure enables the double-layer capacitor to be charged and discharged in a short time, providing high power output; on the other hand, the double-layer structure can provide a larger surface area, which helps to increase the charge storage capacity and thus increase the capacitance of the capacitor; on yet another hand, the double-layer capacitor has a good charging and discharging speed and can be charged and discharged quickly. In addition, the double-layer capacitor has good voltage stability and can maintain a relatively stable output voltage.

[0091] In addition, in this embodiment, the first conductive layer 152 and the second conductive layer 153 are electrically connected to the circuit board 140 respectively, which helps to maintain a stable oscillation state to the greatest extent, thereby outputting a continuous and stable signal.

[0092] In one possible implementation, referring to Figure 8 As shown, the spacing between the first conductive layer 152 and the second conductive layer 153 can be h, where 1 mm ≤ h ≤ 2 mm. For example, h can be set to 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.8 mm, 2 mm or any value between 1 mm and 2 mm according to actual needs.

[0093] Thus, if the spacing h between the first conductive layer 152 and the second conductive layer 153 is less than 1 mm, the electric field strength between them will increase accordingly. If the electric field strength exceeds the maximum bearing capacity of the insulating substrate 151, the insulation of the insulating substrate 151 may be destroyed, resulting in breakdown. In this case, the bound charges may break away from the constraints of atoms or molecules and participate in the conduction, thereby destroying the insulation performance of the capacitor, causing the capacitor to fail to work properly, affecting the service life and stability of the capacitor. If the spacing h between the first conductive layer 152 and the second conductive layer 153 is greater than 2 mm, the electric field strength between them will weaken, resulting in a decrease in the ability of the capacitor to store charge and a decrease in the capacitance value.

[0094] Therefore, in the embodiment of the present application, the spacing h between the first conductive layer 152 and the second conductive layer 153 is limited to between 1mm and 2mm, so that there is a reasonable distance between the first conductive layer 152 and the second conductive layer 153. In this way, on the one hand, the capacity of the capacitor can be effectively increased, the performance of the capacitor can be optimized, and it can store more charge; on the other hand, it helps to maintain the stable working voltage of the capacitor, avoid the problem of too high electric field strength due to too close distance or too far distance causing the electric field strength to weaken, thereby protecting the capacitor from damage and increasing its service life; on the other hand, it helps to optimize the charging and discharging characteristics of the capacitor, so that it can maintain stable performance during rapid charging and discharging; on the other hand, by controlling the spacing between the first conductive layer 152 and the second conductive layer 153, the risk of internal short circuit of the capacitor can be reduced, thereby improving its safety.

[0095] In one possible implementation, referring to Fig.10 As shown, a conductive layer may be provided on one side of the insulating substrate 151, and a ground terminal may be provided on the circuit board 140, so that the conductive layer and the ground terminal form a loop.

[0096] Thus, in this embodiment, the double-sided conductive layer is reduced to a single-sided conductive layer, and the ground terminal of the circuit board 140 can be used as one of the conductive layers, which can also enable the sensing plate 150 to form a capacitor after being energized. In addition, it helps to achieve a low-cost detection function.

[0097] In one possible implementation, referring to Figure 8 and Fig.10 As shown, the orthographic projection of the conductive layer in the thickness direction is located within the range of the insulating substrate 151. Exemplarily, in this embodiment, the conductive layer and the insulating substrate 151 can be annular structures, that is, the ring width of the conductive layer is narrower than the ring width of the insulating substrate 151.

[0098] There may be a gap between the outer edge of the conductive layer and the inner edge of the insulating substrate 151. In this embodiment, there is no limitation on the gap between the outer edge of the conductive layer and the inner edge of the insulating substrate 151, and it can be set according to actual needs. In addition, there is no limitation on the size, shape, etc. of the conductive layer and the insulating substrate 151.

[0099] With this design, the wider insulating substrate 151 can provide more space for the conductive layer, helping to increase the effective area of ​​the electrode; in addition, the narrower conductive layer can reduce the current density, thereby helping to reduce the risk of local overheating, and help ensure good contact between the conductive layer and the insulating substrate 151, thereby reducing contact resistance and avoiding performance degradation due to poor contact.

[0100] In one possible implementation, referring to Figure 8 and Fig. 9 As shown, the sensing plate 150 may further include a protective layer 154 , which covers the surface of the conductive layer; the protective layer 154 has pin holes 155 for exposing the conductive layer.

[0101] In the embodiment of the present application, there is no limitation on the location, quantity and size of the protective layer 154. Figure 7 As shown, the protective layer 154 may include two protective layers, and the two protective layers 154 respectively cover the surfaces of the first conductive layer 152 and the second conductive layer 153. It is understood that the protective layer 154 is a protective layer 154 made of insulating material.

[0102] In this way, the surfaces of the first conductive layer 152 and the second conductive layer 153 are both covered with the protective layer 154. On the one hand, it helps to prevent the first conductive layer 152 and the second conductive layer 153 from directly contacting and conducting each other, thereby avoiding the risk of short circuit of the conductive layer to the greatest extent and improving the safety performance of the sensing electrode 150; on the other hand, the protective layer 154 serves as an additional protection to protect the internal structure of the capacitor and helps to prevent external factors from directly contacting the conductive layer, thereby further ensuring the normal operation of the sensing electrode 150 and extending the service life of the sensing electrode 150.

[0103] In addition, refer to Fig.11 As shown, by providing pin holes 155 on the protection layer 154 , the conductive layer can be welded with leads through the pin holes 155 , thereby leading out and connecting with the circuit board 140 .

[0104] In one possible implementation, referring to Figure 12 to Figure 14 As shown, the cooking appliance 100 may further include a mounting bracket 160, which is disposed on the stove body 131, and the induction plate 150 is disposed on a side of the mounting bracket 160 facing the panel 120. In this way, the induction plate 150 is fixed to the stove body 131 through the mounting bracket 160, which helps to improve the assembly stability of the induction plate 150, thereby ensuring the normal operation of the induction plate 150.

[0105] In this embodiment, the sensing plate 150 and the mounting bracket 160 can be arranged concentrically. It can be understood that the concentric arrangement means that the sensing plate 150 and the mounting bracket 160 have the same center, but the radius can be different. In this way, when the pot is placed on the heating area 121 on the panel 120 opposite to the heating element 132, the sensing plate 150 can accurately sense whether the pot is placed in the heating area 121, with higher sensitivity, which helps to ensure the detection accuracy.

[0106] In one possible implementation, referring to Fig.12 As shown, the mounting bracket 160 may be provided with a positioning groove 161 on one side facing the panel 120, and the sensing plate 150 is disposed in the positioning groove 161. The positioning groove 161 may be provided with a positioning notch 162, and the sensing plate 150 may have a protrusion 156 (see Figure 5 and Figure 6 As shown in FIG. 1 , the protrusion 156 is opposite to the positioning notch 162 , and the protrusion 156 at least partially protrudes out of the positioning groove 161 ; the protrusion 156 is embedded in the positioning notch 162 .

[0107] In the embodiment of the present application, the size of the positioning groove 161 is not limited and can be set according to actual needs. In addition, the location and number of the positioning notch 162 and the protrusion 156 are not limited and can be set according to actual needs.

[0108] In this way, during installation, the protrusion 156 is embedded in the positioning notch 162 to achieve the assembly of the sensing plate 150 and the mounting bracket 160, which helps to further improve the assembly stability of the sensing plate 150 and the mounting bracket 160, thereby ensuring the normal operation of the sensing plate 150.

[0109] In one possible implementation, referring to Figure 5 and Figure 6 As shown, the cooking appliance 100 may include an elastic member 170 , a portion of which is disposed between the stove plate assembly 130 and the mounting bracket 160 , and the elastic member 170 is configured to apply a force toward the panel 120 to the mounting bracket 160 so that the induction plate 150 abuts against the panel 120 .

[0110] In the embodiment of the present application, the elastic member 170 may include a first elastic member 171. Along the thickness direction of the shell 110, the first elastic member 171 may be located between the stove plate assembly 130 and the mounting bracket 160. The first elastic member 171 applies a force toward the panel 120 to the mounting bracket 160 so that the mounting bracket 160 abuts against the panel 120.

[0111] In this way, under the elastic force of the first elastic member 171, the mounting bracket 160 can be provided with a force to abut against the panel 120, so that the sensing plate 150 can be close to the panel 120, thereby maximizing the accuracy of the sensing plate 150 in detecting whether there is a cookware on the panel 120.

[0112] In order to further ensure that the induction plate 150 can be close to the panel 120, in the embodiment of the present application, the elastic member 170 may also include a second elastic member 172. Along the thickness direction of the shell 110, the second elastic member 172 may be located between the stove plate assembly 130 and the bottom wall of the shell 110 to provide a force on the stove plate assembly 130 toward the panel 120.

[0113] Specifically, one end of the second elastic member 172 can abut against the housing 110, and the other end can abut against the stove plate body 131. After the cooking utensil 100 is installed, the second elastic member 172 generates elastic deformation under the action of the stove plate assembly 130 and the housing 110. Correspondingly, the second elastic member 172 can apply a reaction force to the stove plate assembly 130 and the housing 110, so that the heating element 132 of the stove plate assembly 130 can be close to the panel 120, thereby maintaining the heating efficiency of the cooking utensil 100. In addition, the second elastic member 172 provides a force on the stove plate assembly 130 toward the panel 120, so that when the stove plate assembly 130 is close to the panel 120, the induction plate 150 on the stove plate assembly 130 can also be driven to move synchronously, so that the induction plate 150 can be close to the panel 120, thereby improving the accuracy of detecting whether there is a pot on the panel 120.

[0114] For example, the first elastic member 171 and the second elastic member 172 in this embodiment can be springs, which is not limited in this embodiment. In addition, the number and distribution of the first elastic member 171 and the second elastic member 172 are not limited and can be set according to actual needs.

[0115] In one possible implementation, referring to Figure 5 As shown, a fixing column 112 may be provided at the bottom of the shell 110, a first mounting portion 133 may be provided on the furnace plate main body 131, and a second mounting portion 163 may be provided on the mounting bracket 160. The first mounting portion 133 and the second mounting portion 163 correspond to the fixing column 112, and the fixing column 112 may be passed through the first mounting portion 133 to be connected with the second mounting portion 163; the second elastic member 172 is located between the first mounting portion 133 and the second mounting portion 163, and is sleeved on the fixing column 112.

[0116] In this way, the fixing column 112 can be used to provide a guide for a part of the structure of the elastic member 170, so as to reduce the possibility of distortion of the second elastic member 172 during deformation along the thickness direction of the shell. In addition, it helps to improve the assembly stability and assembly strength of the shell 110, the furnace plate body 131 and the mounting bracket 160.

[0117] For example, the specific structure of the first mounting portion 133 and the second mounting portion 163 is not limited. For example, the first mounting portion 133 and the second mounting portion 163 can be mounting holes respectively, which is not limited in this embodiment and can be set according to actual needs. In addition, the number of the fixing column 112, the first mounting portion 133 and the second mounting portion 163 is not limited.

[0118] In one possible implementation, referring to Figure 3As shown, a temperature limiter 180 may be provided on the furnace plate body 131, wherein the temperature limiter 180 mainly controls the heating temperature through a temperature sensor and a control circuit. When the temperature of the heating element 132 exceeds a set value, the temperature sensor sends a signal to the control circuit, and the control circuit transmits the signal to the power cord to turn on the power, and the heating element 132 restarts heating.

[0119] The present application also provides a method for detecting a potless product. Fig.16 and Fig.17 As shown, the method is as follows:

[0120] S100, power on the cooking appliance and put it in standby mode;

[0121] S200, detecting a change in the amplitude of the oscillation circuit through a detection circuit;

[0122] S300, determining whether the amplitude of the oscillation circuit exceeds a preset range;

[0123] S400: If the amplitude of the oscillation circuit exceeds a preset range, it is determined that a pot is placed on the panel, and an unlocking instruction is issued to the heating element to enable the heating element to unlock the heating function.

[0124] S500: If the amplitude of the oscillation circuit is within a preset range, it is determined that no pot is placed on the panel, and the cooking appliance remains in a standby state.

[0125] Thus, in this embodiment, the sensing plate 150 is electrically connected to the oscillation circuit, and the change in the amplitude of the oscillation circuit is used to determine whether there is a cookware on the identification panel 120. The above detection method is not only applicable to conductive metal cookware, but also can quickly and effectively identify non-conductive non-metallic cookware, thereby improving the detection accuracy of cookware of different materials and improving user experience.

[0126] In a possible implementation, after determining that a pot is placed on the panel and issuing an unlocking instruction to the heating element, the method may also include: starting the heating element according to a user instruction; when the cooking utensil is in a heating state, determining whether the pot is located in a heating zone of the panel; if the pot is moved out of the heating zone of the panel, the cooking utensil is in a pause state and the heating element is controlled to stop heating; if the pot is moved into the heating zone of the panel, the cooking utensil resumes the heating state.

[0127] This is conducive to improving the intelligence of the cooking appliance 100, enhancing the user experience, and reducing the possibility of energy consumption due to empty burning and even causing safety hazards.

[0128] In a possible implementation, after the cooking appliance is in the pause state, the method may further include: if it is detected that the pot has moved into the heating zone of the panel, the pause state of the cooking appliance ends and the heating element is controlled to continue heating.

[0129] In this way, after the pot is moved out of the panel 120 to put the cooking appliance 100 into a pause state, when the user moves the pot into the heating zone 121 of the panel 120 again, the amplitude of the oscillation circuit exceeds the preset range, and the circuit board 140 can issue an unlocking instruction to the heating element 132. At this time, the user can start the heating element 132 to continue heating.

[0130] The detailed steps of the no-pot detection method of the present application embodiment are as follows: Fig.16 As shown, the product enters the standby state after being powered on, and the detection unit starts working. When it is detected that there is no pot on the panel, the product remains in the standby state; when it is detected that there is a pot on the panel, the program unlocks the heating function, and the heating can also be started manually; during the operation of the product, if it is detected that the pot on the panel is moved out, the program enters the pause state and stops heating; when the product is in the pause state, if it is detected that the pot on the panel is moved in, the program ends the pause state and continues heating.

[0131] The cooking utensil and the method for detecting a pot without a pot provided by the present application are electrically connected to the oscillating circuit by setting the induction plate. After the induction plate is energized, a capacitor is formed and a stable electrostatic field is formed around it. Any object approaching or entering this electric field will affect the capacitance value of the capacitor and cause the change of the amplitude of the oscillating circuit. Therefore, the present application can effectively judge whether there is a pot on the identification panel according to the change of the amplitude of the oscillating circuit. The detection method of the present application is not only applicable to conductive metal pots, but also can quickly and effectively identify non-conductive non-metallic pots, thereby improving the detection accuracy of pots of different materials and improving the user experience.

[0132] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0133] In the description of the present application, it should be understood that the terms "including" and "having" and any variations thereof used herein are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0134] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, and it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cooking utensil, characterized in that: include: A housing (110), wherein a circuit board (140) is arranged inside the housing (110), and the housing (110) has a mounting opening (111); A panel (120), the panel (120) being arranged at the installation opening (111), and the panel (120) being provided with a heating area (121); A stove plate assembly (130), the stove plate assembly (130) being arranged in the housing (110); the stove plate assembly (130) comprising a stove plate body (131) and a heating element (132), the heating element (132) being connected to the stove plate body (131); the heating element (132) being arranged corresponding to the heating zone (121), and the heating element (132) being electrically connected to the circuit board (140); An induction plate (150), the induction plate (150) being arranged on a side of the stove plate main body (131) close to the panel (120); an oscillation circuit is integrated on the circuit board (140), and the induction plate (150) is electrically connected to the circuit board.

2. The cooking device according to claim 1, characterized in that: The induction electrode (150) comprises an insulating substrate (151) and a conductive layer, the conductive layer being provided on at least one side of the insulating substrate (151), and the conductive layer being electrically connected to the circuit board.

3. The cooking device according to claim 2, characterized in that: The conductive layer comprises a first conductive layer (152) and a second conductive layer (153); the first conductive layer (152) and the second conductive layer (153) are respectively arranged on opposite sides of the insulating substrate (151); the first conductive layer (152) and the second conductive layer (153) are respectively electrically connected to the circuit board.

4. The cooking device according to claim 3, characterized in that: The distance between the first conductive layer (152) and the second conductive layer (153) is h, wherein 1 mm≤h≤2 mm.

5. The cooking device according to claim 2, characterized in that: The conductive layer is provided on one side of the insulating substrate (151), the circuit board (140) is provided with a ground terminal, and the conductive layer and the ground terminal form a loop.

6. The cooking utensil according to any one of claims 2 to 5, characterized in that: The orthographic projection of the conductive layer in the thickness direction is located within the range of the insulating substrate (151); Wherein, there is a distance between the outer edge of the conductive layer and the inner edge of the insulating substrate (151).

7. The cooking utensil according to any one of claims 2 to 5, characterized in that: The sensing electrode (150) further comprises a protective layer (154), wherein the protective layer (154) covers the surface of the conductive layer; the protective layer (154) has pin holes (155) for exposing the conductive layer.

8. The cooking utensil according to any one of claims 1 to 5, characterized in that: The cooking appliance further comprises a mounting bracket (160), wherein the mounting bracket (160) is arranged on the stove plate main body (131), and the induction electrode plate (150) is arranged on a side of the mounting bracket (160) facing the panel (120).

9. The cooking device according to claim 8, characterized in that: A positioning groove (161) is provided on one side of the mounting bracket (160) facing the panel (120), and the sensing electrode (150) is arranged in the positioning groove (161); the positioning groove (161) is provided with a positioning notch (162); the sensing electrode (150) has a protruding portion (156), the protruding portion (156) is opposite to the positioning notch (162), and the protruding portion (156) at least partially protrudes out of the positioning groove (161); the protruding portion (156) is embedded in the positioning notch (162).

10. The cooking appliance according to claim 8, characterized in that The cooking appliance comprises an elastic member (170), a part of the structure of the elastic member (170) being arranged between the stove plate assembly (130) and the mounting bracket (160), and the elastic member (170) being configured to apply a force toward the panel (120) to the mounting bracket (160) so as to make the induction plate (150) abut against the panel (120).

11. The cooking device according to claim 10, characterized in that: A fixing column (112) is provided at the bottom of the shell (110), a first mounting portion (133) is provided on the furnace plate body (131), a second mounting portion (163) is provided on the mounting bracket (160), the first mounting portion (133) and the second mounting portion (163) correspond to the fixing column (112), and the fixing column (112) can be passed through the first mounting portion (133) to be connected to the second mounting portion (163); The elastic member (170) is located between the first mounting portion (133) and the second mounting portion (163), and is sleeved on the fixing column (112).

12. A method for detecting a non-pot, characterized in that: Applied to the cooking appliance according to any one of claims 1 to 11, the method comprising: Powering on the cooking appliance and placing it in a standby state; detecting a change in the amplitude of the oscillation circuit by means of a detection circuit; Determining whether the amplitude of the oscillation circuit exceeds a preset range; If the amplitude of the oscillation circuit exceeds a preset range, it is determined that a pot is placed on the panel, and an unlocking instruction is issued to the heating element so that the heating element unlocks the heating function; If the amplitude of the oscillation circuit is within the preset range, it is determined that no pot is placed on the panel, and the cooking utensil remains in a standby state.

13. The method for detecting a pan-free state according to claim 12, characterized in that: After determining that a cookware is placed on the panel and issuing an unlocking instruction to the heating element, the method further includes: Start the heating element according to the user's instruction; When the cooking utensil is in a heating state, determining whether the pot is located within the heating zone of the panel; If the pot is moved out of the heating area of ​​the panel, the cooking utensil is in a pause state and the heating element is controlled to stop heating; If the pot is moved into the heating zone of the panel, the cooking utensil resumes the heating state.

14. The method for detecting a pan-free state according to claim 13, characterized in that: After the cooking appliance is in a pause state, the method further comprises: If it is detected that the pot moves into the heating zone of the panel, the pause state of the cooking utensil ends and the heating element is controlled to continue heating.

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