Electric food warmer

Abstract

The utility model provides an electric food warmer which comprises an inner pot, an outer shell and a heating device, the inner pot is arranged in the outer shell, and an assembly space is formed between the pot bottom of the inner pot and the outer shell; the heating device comprises a PTC heating assembly, a graphite heat conduction piece and a fixing assembly, one face of the graphite heat conduction piece is attached to the bottom of the inner pot, the other face of the graphite heat conduction piece is attached to the PTC heating assembly, and the heating device is fixedly arranged at the bottom of the inner pot through the fixing assembly. The PTC heating assembly can achieve accurate temperature control, when the temperature of the PTC heating assembly rises to a certain degree, power can be automatically turned down, the automatic temperature control effect is achieved, a temperature controller is not needed, and the overall size of the electric food warmer is reduced; the graphite heat conduction piece is adopted as a heat conduction medium and has elastic extrusion allowance, so that the two side faces of the graphite heat conduction piece can be completely attached to the PTC heating assembly and the pot bottom of the inner pot respectively, and the heating effect of the heating device on the pot bottom of the inner pot is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of small household appliances, in particular to an electric hot pot. Background Art

[0002] An electric frying pan is a kitchen cooking appliance that can be used for cooking operations such as stir-frying, frying, and boiling to meet different cooking needs, which makes the electric frying pan one of the indispensable equipment in the kitchen.

[0003] The existing electric frying pan mainly includes an outer shell and a pot body, and a heating element and related electronic devices are arranged between the outer shell and the pot body. Usually, the heating element is an electric heating tube, which is fixed to the bottom wall of the pot body by welding or clamping. Usually, the electric heating tube needs to be equipped with a thermostat to control the temperature of the electric heating tube. On the one hand, this will cause the space between the outer shell and the pot body to be large, resulting in the height between the bottom of the pot and the bottom wall of the bottom shell of the pot body being too high. On the other hand, when the thermostat controls the temperature, the temperature fluctuation is large, usually around 20 degrees, which is not conducive to precise temperature control. Utility Model Content

[0004] In view of this, it is necessary to provide an electric hot pot to address the above problems, so as to reduce the size of the electric hot pot and improve the temperature control accuracy.

[0005] The utility model provides an electric hot pot, comprising: an inner pot; an outer shell, wherein the inner pot is arranged in the outer shell, and an assembly space is provided between the pot bottom of the inner pot and the outer shell; and a heating device, wherein the heating device comprises a PTC heating component, a graphite heat conductive member and a fixing component, wherein one side of the graphite heat conductive member is in contact with the pot bottom of the inner pot, and the other side is in contact with the PTC heating component, and the fixing component fixes the heating device to the pot bottom of the inner pot.

[0006] In the above-mentioned electric hot pot, the PTC heating component heats the inner pot through the graphite heat conductor. When the temperature of the PTC heating component rises to a certain level, the resistance value of the positive temperature coefficient thermistor material will increase sharply, limiting the flow of current, achieving the effect of automatic temperature control, and the temperature fluctuation of the PTC heating component is small, realizing precise temperature control; and, because the graphite heat conductor is soft, elastic and easy to cut, when the PTC heating component and the graphite heat conductor are fixed to the bottom of the inner pot through the fixing component, the graphite heat conductor has an elastic extrusion margin, so that the two sides of the graphite heat conductor can be respectively fitted between the PTC heating component and the bottom of the inner pot, thereby ensuring the heating effect of the heating device on the bottom of the inner pot, so that the bottom of the inner pot is heated evenly.

[0007] In one of the embodiments, the PTC heating component includes a PTC heating element and a sleeve, the PTC heating element is installed in the sleeve, and the outer surface of the sleeve is in contact with the graphite heat conductive element.

[0008] With such arrangement, the envelope is used to support and protect the PTC heating element, and can also transfer the heat generated by the PTC heating element to the graphite heat conductive element more evenly.

[0009] In one embodiment, there are multiple PTC heating elements, and the envelope includes a heat conducting plate and multiple accommodating cavities arranged side by side on the heat conducting plate, and each of the PTC heating elements is installed in one of the accommodating cavities.

[0010] With such an arrangement, each PTC heating element is separately installed in a containing cavity without affecting each other, thereby being able to improve the safety of the use of the heating device.

[0011] In one embodiment, two adjacent accommodating cavities are spaced apart from each other.

[0012] This arrangement can avoid excessive temperature in some areas of the envelope or graphite heat conductor, causing local overheating of the bottom of the inner pot and affecting the cooking effect or causing safety hazards; at the same time, it can improve the utilization rate of the heat generated by each PTC heating element.

[0013] In one embodiment, the plurality of PTC heating elements are divided into a plurality of groups of heating circuits with different resistance values.

[0014] With such an arrangement, a plurality of PTC heating elements can provide a plurality of different levels of constant temperature, so that a plurality of groups of heating circuits with different resistance values ​​can be configured to provide different predetermined temperatures when turned on.

[0015] In one embodiment, there are four PTC heaters, the two middle PTC heaters form a group, the two PTC heaters on both sides form another group, and the resistance value of the heating circuit composed of the two middle PTC heaters is greater than the resistance value of the two PTC heaters on both sides.

[0016] With such an arrangement, it is possible to select, according to the required temperature, to have only the two middle PTC heaters work, only the two side PTC heaters work, or all four PTC heaters work, so as to meet cooking requirements at different temperatures and expand the application range of the electric hot pot.

[0017] In one embodiment, there are multiple fixing components, one of which is located at the center of the bottom of the inner pot, and the other fixing components are evenly spaced along the circumference of the bottom of the inner pot.

[0018] With such an arrangement, multiple fixing components can improve the stability and reliability of the connection between the PTC heating component, the graphite heat conductive component and the bottom of the inner pot, and ensure that each part between the PTC heating component, the graphite heat conductive component and the bottom of the inner pot can fit tightly, thereby improving the heat conduction efficiency among the three.

[0019] In one of the embodiments, the fixing assembly includes a bolt and a nut, one end of the bolt is welded to the bottom of the inner pot, and passes through the graphite heat conductor and the PTC heating assembly in sequence, and is then fixed by the nut.

[0020] With such arrangement, the bolts and nuts have a simple structure, the production and assembly process are simple and convenient, the cost is low, and the stability and reliability of the connection between the three can be guaranteed.

[0021] In one of the embodiments, the graphite heat conductive member is in the form of a sheet, and the area of ​​the upper surface of the graphite heat conductive member is substantially equal to the area of ​​the bottom of the inner pot.

[0022] With such an arrangement, the two sides of the sheet-like graphite heat conductor can better fit the bottom of the inner pot and the PTC heating component to improve the heat transfer efficiency.

[0023] In one of the embodiments, a heat insulating sheet is further included, and the heat insulating sheet is arranged between the PTC heating component and the bottom wall of the shell.

[0024] With such arrangement, the heat insulation sheet can reduce the downward conduction of heat generated by the PTC heating component during operation, thereby preventing the bottom wall temperature of the housing from being too high, thereby affecting the user experience or damaging the desktop or countertop. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional schematic diagram of the electric hot pot provided in the utility model;

[0026] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0027] Figure 3 for Figure 1 Schematic diagram of the explosion of the medium electric hot pot;

[0028] Figure 4 for Figure 1 Schematic diagram of the explosion of the electric hot pot from another perspective;

[0029] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure of the middle envelope;

[0030] Figure 6 for Figure 1 Installation diagram of the inner pot and heating device.

[0031] Figure numerals: 10, inner pot; 20, outer shell; 30, heating device; 31, PTC heating component; 311, PTC heating element; 312, envelope; 3121, heat conducting plate; 3122, accommodating cavity; 32, graphite heat conducting part; 33, fixing component; 331, bolt; 332, nut; 40, assembly space; 50, thermal insulation sheet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0035] An electric hot pot is a kitchen cooking utensil that can be used for cooking operations such as stir-frying, frying, and boiling to meet different cooking needs, which makes the electric hot pot one of the indispensable equipment in the kitchen. The existing electric hot pot mainly includes an outer shell and a pot body, with a heating element and related electronic devices provided between the outer shell and the pot body. Usually, the heating element is an electric heating tube, which is fixed to the bottom wall of the pot body by welding or clamping. Usually, the electrical tube needs to be equipped with a thermostat to control the temperature of the electric heating tube. On the one hand, this will cause the space between the outer shell and the pot body to be large, resulting in the height between the bottom of the pot and the bottom wall of the bottom shell of the pot body being too high. On the other hand, the temperature control of the thermostat is that the temperature fluctuation is large, usually around 20 degrees, which is not conducive to precise temperature control.

[0036] In addition, the heating element is connected to the bottom wall of the pot body by welding or clamping. Due to other factors such as the flatness of the heating element and the bottom wall of the pot body or the welding quality, the heating element and the bottom wall of the pot body may not fit together or only partially fit together, resulting in uneven heating of the bottom wall of the pot body and a significant reduction in heating power.

[0037] In order to solve the above problems, Figures 1 to 6 As shown, the present application provides an electric hot pot to reduce the size of the electric hot pot and improve the temperature control accuracy.

[0038] Specifically, Figure 1 to Figure 2 As shown, the electric hot pot includes an inner pot 10, an outer shell 20 and a heating device 30, wherein: the inner pot 10 is arranged in the outer shell 20, and an assembly space 40 is provided between the bottom of the inner pot 10 and the outer shell 20; the heating device 30 includes a PTC heating component 31, a graphite heat conductive member 32 and a fixing component 33, one side of the graphite heat conductive member 32 is in contact with the bottom of the inner pot 10, and the other side is in contact with the PTC heating component 31, and the fixing component 33 fixes the heating device 30 to the bottom of the inner pot 10.

[0039] In the electric hot pot provided by the utility model, the PTC heating component 31 includes a positive temperature coefficient thermistor material. Based on the characteristics of the positive temperature coefficient thermistor material, when current passes through the PTC heating component 31, the PTC heating component 31 will heat up, thereby heating the inner pot 10 and the food placed in the inner pot 10; when the temperature of the food in the inner pot 10 is low, the PTC heating component 31 will automatically adjust to the maximum power, quickly convert electrical energy into thermal energy, and heat up quickly, thereby ensuring cooking efficiency; when the temperature of the PTC heating component 31 rises to a certain level, the resistance value of the positive temperature coefficient thermistor material will increase sharply, thereby limiting the flow of current, automatically reducing the power, and achieving the effect of automatic temperature control, and the temperature amplitude of the PTC heating component 31 fluctuates less, usually around 3°C, thereby achieving precise temperature control; the heating device 30 does not need to add an additional thermostat, which can reduce the number of parts. Since the thickness of the PTC heating component 31 is relatively thin, it can avoid occupying too much space between the bottom of the inner pot 10 and the outer shell 20, thereby reducing the overall size of the electric hot pot.

[0040] In addition, the heat generated by the PTC heating component 31 is transferred to the graphite heat conductive member 32, and then the bottom of the inner pot 10 is heated by the graphite heat conductive member 32. Since the thermal resistance of graphite is low, the use of the graphite heat conductive member 32 as the heat conductive medium can ensure the heat conduction effect; since the graphite heat conductive member 32 is soft, elastic and easy to cut, when the PTC heating component 31 and the graphite heat conductive member 32 are fixed to the bottom of the inner pot 10 through the fixing component 33, the graphite heat conductive member 32 has an elastic extrusion margin, so that the two side surfaces of the graphite heat conductive member 32 can be completely fitted with the PTC heating component 31 and the bottom of the inner pot 10 respectively, thereby ensuring the heating effect of the heating device 30 on the bottom of the inner pot 10, and the graphite heat conductive member 32 can be cut according to the shape of the bottom of the inner pot 10, which is convenient for production and processing, and ensures that the bottom of the inner pot 10 is heated evenly.

[0041] The electric hot pot may be an electric frying pan, an electric boiling pot, an electric hot pot, or the like, which heats the food in the inner pot 10 through a heating device 30 between the inner pot 10 and the outer shell 20, and the embodiment of the utility model does not make any specific restrictions here.

[0042] like Figure 3 to Figure 4 As shown, the bottom of the inner pot 10 can be set to a regular or irregular shape such as a circle or a rectangle, and the shape of the graphite heat conductor 32 is the same as the shape of the bottom of the inner pot 10 to ensure that the heating device 30 can heat the bottom of the inner pot 10 evenly to prevent the inner pot 10 from being locally overheated and affecting the cooking effect or causing safety hazards.

[0043] Preferably, the thermal conductivity of the graphite heat conductive member 32 is 700w / (mk) to 1300w / (mk). For example, 700w / (mk), 800w / (mk), 900w / (mk) ... 1200w / (mk), 1300w / (mk) and any other value within the range of 700w / (mk) to 1300w / (mk). Compared with heat conductive sheets made of copper, aluminum and other materials, the thermal conductivity of the graphite heat conductive member 32 is higher, thereby ensuring the heat conductive effect of the graphite heat conductive member 32 and improving the heating effect of the heating device 30 on the bottom of the inner pot 10.

[0044] In addition, the specific gravity of the graphite heat conductive member 32 is 0.85 g / cm 3 Up to 1.9g / cm 3 For example, 0.85g / cm 3 , 0.86g / cm 3 ……0.9g / cm 3 , 1g / cm 3 ……1.9g / cm 3 Equal to 0.85g / cm 3 Up to 1.9g / cm 3Compared with heat conducting sheets made of copper, aluminum and other materials, the graphite heat conducting member 32 has a smaller specific gravity. In the case of the same volume, the graphite heat conducting member 32 is lighter, thereby reducing the overall weight of the heating device 30 and the electric hot pot, making it more convenient for users to use.

[0045] Furthermore, in order to better improve the heat transfer efficiency of the graphite heat conductor 32, the area of ​​the upper surface of the graphite heat conductor 32 is substantially equal to the area of ​​the bottom of the inner pot 10. The graphite heat conductor 32 is formed into a sheet so that the two sides of the graphite heat conductor can better fit the bottom of the inner pot 10 and the PTC heating component 31, which is conducive to improving the heat transfer efficiency. The area of ​​the upper surface of the graphite heat conductor 32 is limited to be substantially equal to the area of ​​the bottom of the inner pot 10. On the one hand, it is prevented that the upper surface of the graphite heat conductor 32 is too small than the area of ​​the bottom of the inner pot, and the inner pot 10 is not heated evenly, and the middle is heated quickly and the edge is heated slowly. On the other hand, it can also prevent the graphite heat conductor 32 from being larger than the bottom of the inner pot 10, causing the graphite heat conductor 32 to leak out of the bottom of the inner pot 10. The heat waste, thereby ensuring that the bottom of the inner pot 10 is heated evenly and improving the heat transfer efficiency. It is worth mentioning that the “substantially equal” in which the area of ​​the upper surface of the graphite heat conductor 32 is substantially equal to the area of ​​the bottom of the inner pot 10 can be understood as being equal within the range of normal process error or measurement error.

[0046] like Figures 2 to 3 As shown, the PTC heating component 31 includes a PTC heating element 311 and a sleeve 312. The PTC heating element 311 is installed in the sleeve 312, and the outer surface of the sleeve 312 is in contact with the graphite heat conductive member 32. The heat generated by the PTC heating element 311 is transferred to the sleeve 312, and is transferred to the graphite heat conductive member 32 through the sleeve 312. The PTC heating element 311 is installed in the sleeve 312, and can be in contact with the inner surface of the sleeve 312 to ensure the heat conduction efficiency between the PTC heating element 311 and the sleeve 312. The outer surface of the sleeve 312 is in contact with the graphite heat conductive member 32 to ensure the heat conduction efficiency between the sleeve 312 and the graphite heat conductive member 32. The sleeve 312 is used to support and protect the PTC heating element 311, and can also transfer the heat generated by the PTC heating element 311 to the graphite heat conductive member 32 more evenly.

[0047] The envelope 312 may be made of a metal material with good thermal conductivity, such as aluminum, and the PTC heating element 311 may be encapsulated in the envelope 312 by a high-temperature resistant polyimide film.

[0048] like Figure 3 and Figure 5As shown, there are multiple PTC heating elements 311, and the envelope 312 includes a heat conducting plate 3121 and multiple accommodating cavities 3122 arranged side by side on the heat conducting plate 3121, and each PTC heating element 311 is installed in a accommodating cavity 3122. Each PTC heating element 311 is installed in a accommodating cavity 3122 separately, without affecting each other, so as to improve the safety of the use of the heating device 30 and avoid the safety hazard caused by the excessive temperature of the PTC heating element 311. Among them, the shape of the heat conducting plate 3121 is the same as the shape of the graphite heat conducting element 32, so as to ensure that the PTC heating component 31 can heat the graphite heat conducting element 32 evenly, and prevent the graphite heat conducting element 32 and the inner pot 10 from being locally overheated, which affects the cooking effect or brings safety hazards.

[0049] like Figure 5 As shown, two adjacent accommodating cavities 3122 are arranged at intervals, which can prevent the distance between two adjacent PTC heating elements 311 from being too close, resulting in excessive temperature in some areas of the envelope 312 or the graphite heat conductive member 32, causing local overheating of the bottom of the inner pot 10 and affecting the cooking effect or causing safety hazards. In addition, the spacing of two adjacent PTC heating elements 311 can improve the utilization rate of the heat generated by each PTC heating element 311, improve the safety of the use of the heating device 30, and at the same time reduce the number of PTC heating elements 311, thereby reducing production and use costs.

[0050] Furthermore, the plurality of PTC heating elements 311 are divided into a plurality of groups of heating circuits with different resistance values. By setting a plurality of PTC heating elements 311, a plurality of constant temperatures at different levels can be provided, so that the plurality of heating circuits with different resistance values ​​can be configured to provide different predetermined temperatures when turned on, and the user can select a suitable cooking temperature level as required.

[0051] In the illustrated embodiment, there are four PTC heaters 311, the middle two PTC heaters 311 form a group, the two PTC heaters 311 on both sides form another group, and the resistance value of the heating circuit composed of the middle two PTC heaters 311 is greater than the resistance value of the two PTC heaters 311 on both sides. The predetermined temperature provided by the heating circuit where the middle two PTC heaters 311 are located when turned on is greater than the predetermined temperature provided by the heating circuit where the two PTC heaters 311 on both sides are located when turned on. The user can choose to work only the middle two PTC heaters 311, only the two PTC heaters 311 on both sides, or all four PTC heaters 311 according to the required temperature, so as to meet the cooking requirements of different temperatures and expand the scope of application of the electric hot pot. The middle two PTC heaters 311 are set as a group, and the two PTC heaters 311 on both sides are set as a group to ensure the uniformity of the heating device 30 heating the bottom of the inner pot 10, and avoid the temperature of the bottom of the inner pot 10 being too high on one side, which affects the cooking effect or brings safety hazards.

[0052] Of course, in other embodiments, the number of the PTC heater 311 may be one, two, three, five, six or more. When there are three PTC heaters 311, the middle PTC heater 311 may be a group, the two PTC heaters 311 on both sides may be another group, and the resistance value of the heating circuit of the middle PTC heater 311 may be greater than the resistance value of the two PTC heaters 311 on both sides. When there are six PTC heaters 311, the middle two PTC heaters 311 may be a first group, the two PTC heaters 311 adjacent to the middle two PTC heaters 311 may be a second group, the two PTC heaters 311 on both sides may be a third group, and the resistance values ​​of the three groups of heating circuits may be different.

[0053] like Figure 4 and Figure 6 As shown, there are multiple fixing components 33, one of which is located at the center of the bottom of the inner pot 10, and the other fixing components 33 are evenly spaced along the circumference of the bottom of the inner pot 10. Multiple fixing components 33 can improve the stability and reliability of the connection between the PTC heating component 31, the graphite heat conductive part 32 and the bottom of the inner pot 10, wherein the fixing component 33 located at the center of the bottom of the inner pot 10 can ensure that the centers of the PTC heating component 31, the graphite heat conductive part 32 and the bottom of the inner pot 10 can fit tightly, and the fixing components 33 arranged along the circumference of the bottom of the inner pot 10 can ensure that the peripheries of the PTC heating component 31, the graphite heat conductive part 32 and the bottom of the inner pot 10 can also fit tightly, so as to ensure that each part between the PTC heating component 31, the graphite heat conductive part 32 and the bottom of the inner pot 10 can fit tightly, and there is basically no gap, thereby improving the heat conduction efficiency between the three.

[0054] The number of the fixing components 33 is preferably four or five, so as to ensure the stability and reliability of the connection between the PTC heating component 31, the graphite heat conductive part 32 and the bottom of the inner pot 10, and avoid assembly difficulties caused by too many fixing components 33. Of course, the number of the fixing components 33 can also be one, two, three or more, while ensuring the stable and reliable connection between the PTC heating component 31, the graphite heat conductive part 32 and the bottom of the inner pot 10, and the utility model does not make specific restrictions here.

[0055] In the illustrated embodiment, the fixing assembly 33 includes a bolt 331 and a nut 332. One end of the bolt 331 is welded to the bottom of the inner pot 10, and passes through the graphite heat conductive member 32 and the PTC heating assembly 31 in sequence, and is fixed by the nut 332. When the nut 332 is threadedly connected to the bolt 331, the PTC heating assembly 31 and the graphite heat conductive member 32 can be pressed and fixed toward the bottom of the inner pot 10. The bolt 331 and the nut 332 have a simple structure, a simple and convenient production and assembly process, a low cost, and can ensure the stability and reliability of the connection between the three.

[0056] Of course, in other embodiments, while ensuring that the PTC heating component 31, the graphite heat conductor 32 and the bottom of the inner pot 10 are stably and reliably connected, the fixing component 33 can also be fixedly connected by other means such as snap-in, plug-in, welding, etc.

[0057] like Figure 1 to Figure 2 As shown, the electric hot pot also includes a heat insulating sheet 50, which is arranged between the PTC heating component 31 and the bottom wall of the housing 20. The heat insulating sheet 50 can isolate the PTC heating component 31 and the bottom wall of the housing 20, reduce the heat generated by the PTC heating component 31 during operation and conduct downward, and prevent the bottom wall temperature of the housing 20 from being too high, which affects the user experience or damages the desktop or countertop.

[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An electric hot pot, characterized in that: include: Inner pot (10); An outer shell (20), the inner pot (10) being arranged in the outer shell (20), and an assembly space (40) being provided between the bottom of the inner pot (10) and the outer shell (20); and A heating device (30), the heating device (30) comprising a PTC heating component (31), a graphite heat conductive component (32) and a fixing component (33), one side of the graphite heat conductive component (32) being in contact with the bottom of the inner pot (10), and the other side of the graphite heat conductive component (32) being in contact with the PTC heating component (31), and the fixing component (33) fixing the heating device (30) to the bottom of the inner pot (10).

2. The electric hot pot according to claim 1, characterized in that: The PTC heating component (31) comprises a PTC heating element (311) and a sleeve (312); the PTC heating element (311) is installed in the sleeve (312); and the outer surface of the sleeve (312) is in contact with the graphite heat conducting element (32).

3. The electric hot pot according to claim 2, characterized in that: There are a plurality of PTC heating elements (311), and the envelope (312) comprises a heat conducting plate (3121) and a plurality of accommodating cavities (3122) arranged side by side on the heat conducting plate (3121), and each of the PTC heating elements (311) is installed in one of the accommodating cavities (3122).

4. The electric hot pot according to claim 3, characterized in that: The two adjacent accommodating cavities (3122) are arranged at intervals.

5. The electric hot pot according to claim 3, characterized in that: The plurality of PTC heating elements (311) are divided into a plurality of groups of heating circuits having different resistance values.

6. The electric hot pot according to claim 5, characterized in that: There are four PTC heaters (311), the two middle PTC heaters (311) form a group, and the two PTC heaters (311) on both sides form another group, and the resistance value of the heating circuit formed by the two middle PTC heaters (311) is greater than the resistance value of the two PTC heaters (311) on both sides.

7. The electric hot pot according to claim 1, characterized in that: There are a plurality of fixing components (33), one of which is located at the center of the bottom of the inner pot (10), and the other fixing components (33) are evenly spaced along the circumference of the bottom of the inner pot (10).

8. The electric hot pot according to claim 1, characterized in that: The fixing assembly (33) comprises a bolt (331) and a nut (332); one end of the bolt (331) is welded to the bottom of the inner pot (10), and passes through the graphite heat conducting member (32) and the PTC heating assembly (31) in sequence before being fixed by the nut (332).

9. The electric hot pot according to claim 1, characterized in that: The graphite heat conducting member (32) is in the form of a sheet, and the area of ​​the upper surface of the graphite heat conducting member (32) is substantially equal to the area of ​​the bottom of the inner pot (10).

10. The electric hot pot according to claim 1, characterized in that: It also includes a heat insulation sheet (50), which is arranged between the PTC heating component (31) and the bottom wall of the housing (20).

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