A heat retaining appliance

Abstract

This utility model relates to the technical field of heat preservation appliances, and more particularly to a heat preservation appliance, including a food basin, a heating element connected to the food basin, a first temperature detector connected to the food basin, a second temperature detector connected to the heating element, and a control device. The first temperature detector, the second temperature detector, and the humidity detector capture the changes in the actual temperature and humidity of the food to be kept warm in the heat preservation appliance in real time. The control device precisely controls the operation of the heating element and the humidification device, ensuring that different types of food maintain their taste within the optimal eating temperature range, while dynamically replenishing the food with moisture through steam. At the same time, by detecting the temperature of the heating element, corresponding heating safety thresholds are set according to different types of food to prevent the food from losing moisture and burning due to prolonged exposure to high temperatures during the heat preservation process.

Description

Technical Field

[0001] This utility model relates to the technical field of heat preservation appliances, and in particular to a heat preservation appliance. Background Technology

[0002] In hotels, restaurants, and similar establishments, food warmers are commonly used to hold and keep food warm. Traditional food warmers often use a single, fixed temperature setting or limited adjustable settings, making it impossible to precisely set the temperature for different foods. Furthermore, during prolonged heating and warming, the surface moisture of the food evaporates rapidly, causing the food to lose its optimal texture and flavor. For example, rice becomes dry, hard, and lumpy; fried foods lose their crispness and become soggy and greasy; and porridge loses a lot of moisture, becoming thick and burnt, significantly reducing the user experience.

[0003] In addition, most food warmers have heating elements such as heating wires and heating tubes installed at the bottom of the oven to heat and keep the food inside at a single fixed temperature. However, when the food is kept warm continuously, the surface temperature of the heating elements is prone to overheating. The food inside the oven is continuously heated in a localized and excessively high temperature, which makes it very easy for the food to burn at the bottom. This further damages the original taste and flavor of the food and further reduces the user experience.

[0004] This utility model was proposed in response to the shortcomings of the existing technology. Utility Model Content

[0005] This utility model addresses the shortcomings of the traditional insulated food stoves mentioned above by proposing an insulated appliance.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A heat-insulating appliance, comprising:

[0008] A food bowl, used to hold food;

[0009] A heating element, which is connected to the food bowl and used to heat the food bowl;

[0010] A first temperature detector is connected to the food bowl and is used to detect the temperature of the food bowl;

[0011] A second temperature detector is connected to the heating element and is used to detect the temperature of the heating element;

[0012] The control device includes a heating element, a first temperature detector, and a second temperature detector, which are electrically connected to the control device.

[0013] In the heat preservation appliance described above, the first temperature detector and the heating element are respectively disposed at the lower part of the food bowl and respectively in contact with the bottom of the food bowl, and the heating element is provided with a clearance opening for the first temperature detector to pass through.

[0014] In one of the heat preservation appliances described above, the bottom of the heating element is provided with a first mounting cavity for mounting a second temperature detector.

[0015] The heat preservation appliance described above further includes a humidity detector and a humidification device respectively disposed on one side of the food basin. The humidity detector and the humidification device are located above the heating element. The humidity detector is used to detect the humidity inside the food basin. The output end of the humidification device is connected to the inside of the food basin. The humidity detector and the humidification device are electrically connected to the control device.

[0016] The heat preservation appliance described above further includes an overload protector connected to the heating element, the overload protector being electrically connected to the control device, and a second mounting cavity for mounting the overload protector being provided at the bottom of the heating element.

[0017] As described above, a heat preservation appliance has a receiving cavity inside, in which the food bowl and the heating element are arranged vertically. The bottom of the heating element has a first mounting part and a support part located on one side of the first mounting part. The bottom of the receiving cavity has a second mounting part corresponding to the first mounting part, and the support part abuts against the bottom of the receiving cavity.

[0018] As described above, in a heat preservation appliance, a warning label module is provided on the side of the heating element facing the food bowl.

[0019] The heat preservation appliance described above also includes a furnace body assembly and a furnace cover connected to the furnace body assembly. The food bowl is disposed inside the furnace body assembly and is covered by the furnace cover on the upper part of the food bowl. The furnace cover can be opened or closed relative to the furnace body assembly.

[0020] The furnace cover or the furnace body assembly is provided with a cover opening sensor electrically connected to the control device, which detects whether the furnace cover is open or closed.

[0021] The heat preservation appliance described above also includes a pot detection switch, which is electrically connected to the control device and detects the placement of the food bowl.

[0022] The heat preservation appliance described above further includes an external operation panel, which is electrically connected to the control device. The operation panel is provided with several function buttons and a display screen.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This invention provides a heat preservation appliance, which includes a first temperature detector, a second temperature detector, a humidity detector, a heating element, and a humidification device electrically connected to a control device. The first temperature detector, the second temperature detector, and the humidity detector capture the changes in the actual temperature and humidity of the food to be kept warm in the heat preservation appliance in real time. The control device precisely controls the operation of the heating element and the humidification device, ensuring that different types of food maintain their taste within the optimal eating temperature range, while dynamically replenishing the food with moisture through steam. At the same time, by detecting the temperature of the heating element, corresponding heating safety thresholds are set according to different types of food to prevent the food from losing moisture and burning due to prolonged exposure to high temperatures during the heat preservation process.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the closed lid of the heat preservation appliance of this utility model;

[0027] Figure 2 This is a rear perspective view of the heat preservation appliance of this utility model;

[0028] Figure 3 This is a schematic diagram of the open lid of the heat preservation appliance of this utility model;

[0029] Figure 4 for Figure 1 Sectional view A-A in the middle;

[0030] Figure 5 for Figure 1 The B-B section view in the diagram;

[0031] Figure 6 This is a schematic diagram of the top of the heating element of this utility model;

[0032] Figure 7 This is a bottom schematic diagram of the heating element of this utility model. Detailed Implementation

[0033] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0034] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0035] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0036] Example 1:

[0037] like Figure 1As shown in Figure 7, this utility model provides a heat preservation appliance, which can be configured as a household or commercial heat preservation stove. This utility model does not specifically limit the specific type of appliance. Specifically, the heat preservation appliance includes a food bowl 3, a heating element 4, a first temperature detector 61, a second temperature detector 62, and a control device 1. The food bowl 3 is used to hold food. The heating element 4 is connected to the food bowl 3 and used to heat the food bowl 3. The first temperature detector 61 is connected to the food bowl 3 and used to detect the temperature of the food bowl 3. The second temperature detector 62 is connected to the heating element 4 and used to detect the temperature of the heating element 4. The heating element 4, the first temperature detector 61, and the second temperature detector 62 are electrically connected to the control device 1. In practical applications, the first temperature detector 61 can detect the temperature of the food bowl 3 in real time and transmit the measured temperature to the control device 1. The real-time temperature value of the food bowl 3 is sent to the control device 1 to trigger the control device 1 to control the operation of the heating element 4, thereby adjusting the real-time temperature of the food bowl 3 to the preset heat preservation temperature range. This achieves the food heat preservation function of the heat preservation appliance, which is conducive to the precise control of heating and constant temperature preservation, ensuring that different foods maintain their taste within the optimal eating temperature range and optimizing the user's eating experience. Furthermore, during the heat preservation process, the heat preservation appliance can also detect the temperature of the heating element 4 in real time through the second temperature detector 62, and send the measured real-time temperature value of the heating element 4 to the control device 1 to trigger the control device 1 to further control the operation of the heating element 4, thereby maintaining the temperature of the heating element 4 within a preset safety threshold range. This prevents the food from losing moisture and burning due to prolonged high temperature during the heat preservation process, further optimizing the user's eating experience.

[0038] Optionally, the control device 1 is equipped with a PWM adjustment module. Based on the real-time temperatures of the food bowl 3 and the heating element 4 measured by the first temperature detector 61 and the second temperature detector 62, the PWM adjustment module controls the heating element 4 to heat the food bowl 3 at different output powers, thereby adjusting the temperature of the food bowl 3 to a preset heat preservation temperature range and the temperature of the heating element 4 to a preset safety threshold range. For example, when the heat preservation device is in the heating stage, the PWM adjustment module can control the heating element 4 to operate at its rated power to heat the food bowl 3 at full power, thereby achieving rapid heating; when the heat preservation device is in the constant temperature heat preservation stage, the PWM adjustment module can control the heating element 4 to operate at half power to achieve the desired temperature for the food. The constant temperature insulation prevents food from burning due to continuous high-temperature heating. In addition, during the constant temperature process, the heating element 4 operates at a lower power, which reduces energy consumption and safety hazards while maintaining the temperature of the food. This can significantly reduce operating costs for long-term use of commercial insulation equipment. Furthermore, during the insulation process, the temperature of the heating element 4 can be monitored in real time by the second temperature detector 62. If the temperature of the heating element 4 is detected to be below or within the preset safety threshold range, the heating element 4 can continue to operate. If the temperature of the heating element 4 is detected to be above the upper limit of the preset safety threshold range, the control device 1 controls the heating element 4 to stop operating. Once the temperature of the heating element 4 returns to the preset safety threshold range, the heating element 4 can be controlled to continue operating.

[0039] Furthermore, such as Figure 4 As shown, the first temperature detector 61 and the heating element 4 are respectively located at the lower part of the food bowl 3 and are in contact with the bottom of the food bowl 3. The heating element 4 has a clearance opening 400 for the first temperature detector 61 to pass through. In this embodiment, the heating element 4 is heat-conducting as a whole. The heating element 4 is located at the lower part of the food bowl 3, and the top surface of the heating element 4 is in close contact with the bottom surface of the food bowl 3. It conducts heat to the food in the inner cavity of the food bowl 3 through the bottom of the food bowl 3, which helps to improve the heat conduction efficiency and thus improve the heating and heat preservation effect. On the other hand, the first temperature detector 61 is located at the lower part of the food bowl 3. The first temperature detector 61 is fixedly installed in the heat preservation device and passes through the heating element 4 to contact the bottom of the food bowl 3, so as to accurately monitor the temperature of the food bowl 3 and prevent the food from sticking to the bottom. In order to protect the first temperature detector 61 and improve the accuracy of the first temperature detector 61 in measuring the temperature of the food bowl 3, the heating element 4 has the clearance opening 400. The inner diameter of the clearance opening 400 is larger than the outer diameter of the probe of the first temperature detector 61.

[0040] Furthermore, such as Figure 4 and Figure 7As shown, the bottom of the heating element 4 is provided with a first mounting cavity 401 for mounting a second temperature detector 62. The second temperature detector 62 is installed in the first mounting cavity 401. In this embodiment, the temperature of the heating element 4 is accurately detected by the second temperature detector 62. In order to reduce the volume occupied by the heating element 4, the bottom of the heating element 4 is provided with an extension 406. The first mounting cavity 401 is located in the extension 406, and the bottom of the first mounting cavity 401 extends outward. The second temperature detector 62 is inserted into the first mounting cavity 401 to facilitate accurate detection of the real-time temperature of the heating element 4. The second temperature detector 62 extends at least partially outside the first mounting cavity 401 and is electrically connected to the control device 1, which is beneficial to the safe use of the second temperature detector 62.

[0041] In some alternative embodiments, to ensure the safe operation of the heat preservation appliance, the heat preservation appliance further includes an overload protector 41 connected to the heating element 4. The overload protector 41 is electrically connected to the control device 1. The bottom of the heating element 4 is provided with a second mounting cavity 402 for installing the overload protector 41. In this embodiment, the overload protector 41 is inserted into the second mounting cavity 402, and the overload protector 41 extends at least partially outside the second mounting cavity 402 and is electrically connected to the control device 1. In practical applications, when the second temperature detector 62 detects that the temperature of the heating element 4 exceeds the limit (e.g., exceeding 200°C), it will trigger the overload protector 41, which will trigger the control device 1 to forcibly cut off the power. After the heating element 4 cools down, the user can manually restart the heat preservation appliance. Optionally, the overload protector 41 can be set as a snap-action temperature controller in the prior art. This embodiment does not make specific limitations.

[0042] Further, optionally, to simplify the structure of heating element 4, such as Figure 4 As shown, the extension 406 is located on one side of the clearance opening 400, the second mounting cavity 402 is located inside the extension 406, and the second mounting cavity 402 is located on one side of the first mounting cavity 401. The first mounting cavity 401 and the second mounting cavity 402 are separated by the extension 406 body.

[0043] In other alternative embodiments, since the food bowl 3 needs to bear the weight of different foods, and the heating element 4 is located at the bottom of the food bowl 3, in order to improve the structural stability and support of the food bowl 3 and the heating element 4, such as Figure 5As shown, the heat preservation appliance has a receiving cavity 8. The food bowl 3 and the heating element 4 are arranged vertically within the receiving cavity 8. The bottom of the heating element 4 has a first mounting part 403 and a support part 404 located on one side of the first mounting part 403. The bottom of the receiving cavity 8 has a second mounting part 81 corresponding to the first mounting part 403. The support part 404 abuts against the bottom of the receiving cavity 8. In this embodiment, the heating element 4 is detachably installed in the receiving cavity 8 through the first mounting part 403. The first mounting part 403 and the second mounting part 81 can be configured as a plug-in structure, a screw connection structure, etc., and this utility model does not make specific limitations. Furthermore, the heating element 4 can abut against the bottom of the receiving cavity 8 through the support part 404, which helps to improve the structural strength and support force of the heating element 4, thereby improving the stability of the food bowl 3.

[0044] Alternatively, multiple support portions 404 may be provided and spaced apart at the bottom of the heating element 4 to further enhance the structural strength and support of the heating element 4.

[0045] In other alternative embodiments, to mitigate safety risks associated with the use of insulation appliances and ensure user safety, such as... Figure 6 As shown, a warning label module 405 is provided on the side of the heating element 4 facing the food bowl 3. The warning label module 405 includes at least a high temperature warning label, a "Do Not Add Water" warning label, and a "Do Not Touch at High Temperature" label. In practical applications, the warning label module 405 faces the bottom of the food bowl 3. When the user opens the insulated appliance and removes the food bowl 3, the warning label module 405 can be seen directly. The warning label module 405 reminds the user of the precautions for using the insulated appliance, thereby avoiding injury or accidents when the user uses the insulated appliance.

[0046] In other alternative embodiments, such as Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the heat preservation appliance also includes a furnace body assembly 22 and a furnace cover 21 connected to the furnace body assembly 22. The food bowl 3 is disposed inside the furnace body assembly 22, and the furnace cover 21 covers the upper part of the food bowl 3. The furnace cover 21 can be opened or closed relative to the furnace body assembly 22. In practical applications, the user can manually open and close the furnace cover 21 to facilitate operations such as food heat preservation, food retrieval, and adding food midway. In this embodiment, the furnace cover 21 and the furnace body assembly 22 can be rotatably connected by a hinge structure to realize the heat preservation appliance. It has an opening and closing function; furthermore, the furnace cover 21 or the furnace body assembly 22 is provided with an opening sensor electrically connected to the control device 1. The opening sensor detects whether the furnace cover 21 is open or closed, and sends an opening signal and a closing signal corresponding to the opening or closing of the furnace cover 21 to the control device 11, respectively. In practical applications, in order to further improve user safety, the control device 1 is configured to activate the heating element 4 and other actuators only when the closing signal is detected.

[0047] Further optionally, the receiving cavity 8 is disposed within the furnace body assembly 22 and is used to receive the food bowl 3 and the heating element 4. The control device 1 is disposed within the furnace body assembly 22 and is located below the receiving cavity 8. The first temperature detector 61, the second temperature detector 62 and the overload protector 41 pass through the bottom of the receiving cavity 8 and are electrically connected to the control device 1.

[0048] In some alternative embodiments, the oven lid 21 is provided with a transparent window, through which the user can observe the inner cavity of the food bowl 3, which is beneficial for the user to observe the heat preservation and quantity of the food.

[0049] In some alternative embodiments, the heat preservation appliance also includes a pot detection switch disposed on the food bowl 3. The pot detection switch is electrically connected to the control device 1 and detects the placement of the food bowl 3. In practical applications, the pot detection switch detects whether the food bowl 3 is placed in place. When the food bowl 3 is placed in place, the pot detection switch can send a signal to the control device 1 indicating that the food bowl 3 is in place. The control device 1 is configured to activate the heat preservation appliance or the heating element 4 and other actuators only when it detects the signal indicating that the food bowl 3 is in place. Otherwise, if the control device 1 determines that the food bowl 3 is not placed in place, it cannot activate the heating element 4 to prevent the heating element from burning dry, thereby protecting the heat preservation appliance and further improving user safety. Optionally, the pot detection switch can be set as a micro switch or a photoelectric sensor, which is not specifically limited in this embodiment.

[0050] In other alternative embodiments, such as Figure 1As shown, the heat preservation appliance also includes an external operation panel 7, which is electrically connected to the control device 1. The operation panel 7 has several function buttons 71 and a display screen 72. In practical applications, users can control the operation of the heat preservation appliance through the function buttons 71. The operation panel 7 can send different selection operation signals from the user to the control device 1. The control device 1 can respond to the user's selection operation signals to control the operation of the heat preservation appliance and control the display screen 72 to display the corresponding operating status, etc., which helps users to intuitively understand the operating status of the heat preservation appliance and to operate the heat preservation appliance according to their needs. In addition, the display screen 72 can also display the temperature of the food bowl 3 measured in real time by the first temperature detector 61, which helps users to independently input and adjust the heat preservation temperature of the food. Optionally, the several function buttons 71 may include at least a power button, a menu selection button, a heat preservation start button, and a timer function button 71, etc. This utility model does not make specific limitations.

[0051] Example 2:

[0052] Based on the above-described embodiment one, this utility model also provides another optional implementation of the heat preservation device, such as... Figure 2 and Figure 5 As shown, the heat preservation appliance also includes a humidity detector 63 and a humidifying device 5 respectively disposed on one side of the food basin 3. The humidity detector 63 and the humidifying device 5 are located above the heating element 4. The humidity detector 63 is used to detect the humidity inside the food basin 3. The output end of the humidifying device 5 is connected to the inside of the food basin 3. The humidity detector 63 and the humidifying device 5 are electrically connected to the control device 1 respectively.

[0053] Since the heating element 4 heats the food from the bottom of the food bowl 3, in order to improve the uniformity of heating, the food bowl 3 is equipped with a humidification device 5 and a humidity detector 63 near the top. The humidification device 5 inputs steam or water vapor into the inner cavity of the food bowl 3, which can make the food heat evenly and replenish moisture during the heat preservation process, thereby maintaining the best taste of the food and further optimizing the user's eating experience. Furthermore, the humidity detector 63 detects the humidity value of the inner cavity of the food bowl 3 in real time to reflect the real-time humidity of the food. In practical applications, the humidity detector 63 can send the real-time humidity value of the food to the control device 1, and the PWM adjustment module can control the start and stop of the humidification device 5 to adjust the humidity of the food to the preset heat preservation humidity range. For example, when the humidity detector 63 detects that the real-time humidity of the food is lower than the lower limit of the preset heat preservation humidity range, the control device 1 can trigger the humidification device 5 to start; when the humidity detector 63 detects that the real-time humidity of the food is within the preset heat preservation humidity range or higher than the upper limit of the preset heat preservation humidity range, the control device 1 can trigger the humidification device 5 to turn off, thereby precisely adjusting the humidity of the inner cavity of the food basin 3, so as to replenish the food with moisture in time; optionally, the humidification device 5 can be set as a humidifier with a water tank S in the prior art. The water tank S can be set outside the furnace body assembly 22, the humidifier is set in the water tank S, and the output end of the humidifier is connected to the inner cavity of the food basin 3. During the heat preservation process, after the humidifier inputs water vapor into the inner cavity of the food basin 3, the water vapor can be heated in the inner cavity of the food basin 3 to form steam.

[0054] In this invention, the environmental changes of the food to be kept warm in the heat preservation device can be captured in real time by the first temperature detector 61, the second temperature detector 62, and the humidity detector 63. These environmental changes include the actual temperature and humidity changes of the food to be kept warm. The control device 1 accurately drives the heating element 4 and the humidification device 5 based on the PWM algorithm, which not only ensures that different types of food maintain their taste within the optimal eating temperature range, but also dynamically replenishes the moisture of the food with steam. At the same time, by detecting the temperature of the heating element 4, the corresponding heating safety threshold is set according to different types of food to prevent the food from losing water and burning due to prolonged high temperature during the heat preservation process.

[0055] Optionally, the humidification device 5 and the humidity detector 63 are located inside the oven body assembly 22 and respectively on opposite sides of the food basin 3, so as to facilitate the humidity detector 63 to accurately measure the real-time humidity of the food, improve the reliability of the real-time humidity data, and further improve the accuracy of humidification control.

[0056] Optionally, the furnace body assembly 22 includes a first bracket for mounting the humidification device 5, a second bracket for mounting the humidity detector 63, and a furnace body disposed between the first and second brackets. The first and second brackets are respectively connected between the outer shell of the furnace body assembly 22 and the furnace body. The receiving cavity 8 is disposed within the furnace body. The food basin 3 is hung between the first and second brackets. The tops of the first and second brackets communicate with the inner cavity of the food basin 3, so that the output end of the humidification device 5 can deliver water vapor to the inner cavity of the food basin 3, and the sensing end of the humidity detector 63 can accurately detect the humidity inside the food basin 3, thereby detecting the humidity of the food.

[0057] Further optionally, in order to further improve user safety and prevent users from being burned, the control device 1 may also be configured to activate the humidity detector 63 and the humidifier 5 only after detecting the closing signal of the cover.

[0058] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A heat-insulating appliance, characterized in that, include: Food bowl (3), which is used to hold food; A heating element (4) is connected to the food bowl (3) and is used to heat the food bowl (3); A first temperature detector (61) is connected to the food bowl (3) and is used to detect the temperature of the food bowl (3); A second temperature detector (62) is connected to the heating element (4) and is used to detect the temperature of the heating element (4); The control device (1) is electrically connected to the heating element (4), the first temperature detector (61), and the second temperature detector (62).

2. The heat preservation appliance as described in claim 1, characterized in that, The first temperature detector (61) and the heating element (4) are respectively located at the bottom of the food bowl (3) and respectively in contact with the bottom of the food bowl (3). The heating element (4) is provided with a clearance opening (400) for the first temperature detector (61) to pass through.

3. A heat-insulating appliance as described in claim 1, characterized in that, The bottom of the heating element (4) is provided with a first mounting cavity (401) for mounting a second temperature detector (62).

4. A heat-insulating appliance as described in claim 1, characterized in that, It also includes a humidity detector (63) and a humidifier (5) respectively located on one side of the food bowl (3). The humidity detector (63) and the humidifier (5) are located above the heating element (4). The humidity detector (63) is used to detect the humidity inside the food bowl (3). The output end of the humidifier (5) is connected to the inside of the food bowl (3). The humidity detector (63) and the humidifier (5) are electrically connected to the control device (1).

5. A heat-insulating appliance as described in claim 1, characterized in that, It also includes an overload protector (41) connected to the heating element (4), the overload protector (41) being electrically connected to the control device (1), and a second mounting cavity (402) for mounting the overload protector (41) being provided at the bottom of the heating element (4).

6. A heat-insulating appliance as described in claim 1, characterized in that, The heat preservation appliance has a receiving cavity (8). The food bowl (3) and the heating element (4) are arranged vertically in the receiving cavity (8). The heating element (4) has a first mounting part (403) at the bottom and a support part (404) located on one side of the first mounting part (403). The receiving cavity (8) has a second mounting part at the bottom corresponding to the first mounting part (403). The support part (404) abuts against the bottom of the receiving cavity (8).

7. A heat-insulating appliance as described in claim 1, characterized in that, The heating element (4) has a warning sign module (405) on the side facing the food bowl (3).

8. A heat-insulating appliance as described in claim 1, characterized in that, It also includes a furnace body assembly (22) and a furnace cover (21) connected to the furnace body assembly (22). The food bowl (3) is located inside the furnace body assembly (22) and is covered by the furnace cover (21) on the upper part of the food bowl (3). The furnace cover (21) can be opened or closed relative to the furnace body assembly (22). The furnace cover (21) or the furnace body assembly (22) is provided with an opening sensor that is electrically connected to the control device (1) to detect whether the furnace cover (21) is open or closed.

9. A heat-insulating appliance as described in claim 1, characterized in that, It also includes a pot detection switch located on the food basin (3), which is electrically connected to the control device (1) and detects the placement of the food basin (3) through the pot detection switch.

10. A heat-insulating appliance as described in claim 1, characterized in that, The heat preservation appliance also includes an external operation panel (7), which is electrically connected to the control device (1). The operation panel (7) has several function buttons (71) and a display screen (72).

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