Heating assembly and vegetable warming device

Abstract

The utility model relates to a heating assembly and a dish warming device, the heating assembly comprises a heating film, a panel and a heat insulation layer, the heating film comprises a first insulation layer, a heating layer and a second insulation layer, the heating layer comprises a graphene layer and a conductive layer, and the heating film is arranged between the panel and the heat insulation layer; the graphene layer is arranged on the conductive layer; the graphene layer is composed of graphene channels with two ends, and the graphene channels are continuously and uniformly arranged. The heating assembly and the dish warming device have the advantages that under the condition that the same heat is output, the resistance wire is of a winding type, the center temperature is very high, the graphene layer is used for heating in a face mode, heat conduction is fast and uniform, the temperature is far lower than that of the resistance wire, larger power density can be achieved, and the heating efficiency is improved. And higher heating rate and effective output power are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of food warming devices, in particular to a heating component and a food warming device. Background Art

[0002] The food warming device is a heating appliance that heats a panel through a heating mechanism, and the panel transfers heat to the food placed on the panel, thereby solving the need for keeping the food warm.

[0003] In the prior art, the heating component of the food warming device generally adopts a resistance wire heater, which is composed of a resistance wire and an insulating material, and the insulating material surrounds the outside of the resistance wire. The resistance wire is a winding type. After the heating starts, the center temperature is high and the peripheral temperature is low, and the temperature is extremely uneven. The high temperature in the center of the resistance wire will affect the insulating material. The insulating material will age and fail rapidly at high temperatures, which will lead to leakage, thus limiting the overall temperature of the resistance wire from being too high. Therefore, the maximum power density of the resistance wire heater cannot be too high at present, so the heating rate and effective output power of the food warming device using this heating technology are low. Utility Model Content

[0004] An object of the present application is to provide a heating component and a food warming device that can improve the heating rate and effective output power.

[0005] The technical solution adopted in the present application is: a heating film, including a heating film, a panel and at least one thermal insulation layer, the heating film is arranged between the panel and the thermal insulation layer, the heating film includes a first insulating layer, a heating layer and a second insulating layer from top to bottom, the heating layer includes a graphene layer and a conductive layer; the graphene layer is composed of a graphene channel, the graphene channel has two ends, and the graphene channels between the two ends are continuously and evenly arranged; the graphene layer is arranged on the conductive layer.

[0006] Compared with the prior art, the advantage of the present application is that the heating of the graphene layer is surface heating, and the heat conduction is fast and uniform. When the same amount of heat is output, the temperature of the graphene heating body is much lower than the temperature of the resistance wire, so a greater power density can be achieved, and a faster heating rate and effective output power are realized; the graphene channel can be designed into different patterns to achieve different impedances to meet the needs of different heating powers, and the continuous and uniform arrangement can achieve uniform heating of the entire surface without local overheating. It can be evenly arranged in the heating area, which can make the heating effect of the food warming device better and output higher effective power; while carrying the graphene layer, the conductive layer can also enable the entire pattern to achieve more reliable electrical conduction, prevent breakage and failure, and is also more conducive to processing.

[0007] In some embodiments of the present application, the duty cycle of the graphene layer is 25%-75%. By controlling the duty cycle, the impedance of the heating film can be controlled within a reasonable range to avoid local overheating, and is suitable for various shapes, especially special shapes.

[0008] In some embodiments of the present application, the conductive layer cooperates with the graphene layer; the conductive layer adopts a metal film. The metal film has high strength, good conductivity, strong processability, and is easy to process.

[0009] Furthermore, a first connection layer is provided between the first insulating layer and the graphene layer, and the first insulating layer and the graphene layer are connected through the first connection layer; a second connection layer is provided between the conductive layer and the second insulating layer, and the conductive layer and the second insulating layer are connected through the second connection layer. This structure can seal and insulate the graphene layer, and prevent problems such as oxidation and scratching of the heating component.

[0010] Furthermore, the first connection layer uses vacuum thermosetting adhesive; the second connection layer uses vacuum thermosetting adhesive; the first insulation layer uses PI film; the second insulation layer uses PI film. Vacuum thermosetting adhesive can achieve the purpose of curing, exhausting air, sealing and high strength after curing; the use of PI film can achieve sealing, prevent oxidation and scratching of the heating component, and is flexible and has high adhesion.

[0011] In some embodiments of the present application, electrode transition layers are provided at both ends of the graphene channel; electrode holes are provided on the first insulating layer, and the electrode holes are opposite to the electrode transition layers. The electrode holes are used to electrically connect the wires to the electrode transition layers, which facilitates reliable connection with external circuits, and its reliability is much higher than the effect of direct bonding of the wires to the graphene channel.

[0012] In some embodiments of the present application, the heat insulation layer is provided with at least two layers; the heat insulation layer is a composite material layer of nano-silicon dioxide aerogel and panel fiber material. The heat insulation layer can bring better heat insulation effect in a limited space, so that the temperature of the bottom shell of the food warming device can be reduced to a safe area, which is convenient for improving the user's experience.

[0013] A food warming device comprises the above-mentioned heating assembly and an insulating shell, wherein a heat insulating layer is arranged between the heating film and the insulating shell. Through optimized configuration, the requirements of the upper surface temperature warming the food and the lower surface temperature not being hot to the touch are achieved in a relatively small space, and the overall heat insulation effect and protection are good.

[0014] In some embodiments of the present application, at least two heating components are provided.

[0015] Furthermore, it also includes a controller, which can independently control the heating of each heating component, and the controller is electrically connected to the heating component.

[0016] Furthermore, it also includes a temperature sensor, which is used to sense the heating temperature of the heating component, and the temperature sensor is electrically connected to the controller.

[0017] In some embodiments of the present application, a gap is provided between the heat insulating layer and the insulating shell for air flow. The design of the gap allows air insulation between the heat insulating layer and the insulating shell, further improving the heat insulation performance.

[0018] In some embodiments of the present application, the bottom of the insulating housing is provided with feet. The design of the feet facilitates fixing to the desktop and at the same time raises the bottom surface of the insulating housing, so that there is space for airflow between the insulating bottom shell and the desktop, which is beneficial to the heat dissipation of the housing.

[0019] In some embodiments of the present application, the insulating housing is provided with exhaust holes, which can improve the internal heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the utility model embodiment 1 Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of the utility model embodiment 1 Figure 2 ;

[0022] Figure 3 It is a schematic diagram of the layered structure of Example 1 of the utility model;

[0023] Figure 4 It is a schematic structural diagram of the electrode transition layer of Example 1 of the utility model;

[0024] Figure 5 It is a top view of the heating film and the metal tape attached to each other in Example 2 of the utility model;

[0025] Figure 6 It is a structural schematic diagram of Embodiment 2 of the present utility model;

[0026] Figure 7 It is a structural schematic diagram of Embodiment 3 of the present utility model;

[0027] Figure 8 It is a wiring diagram of the controller of Embodiment 3 of the present utility model;

[0028] Fig. 9 It is a schematic diagram of the structure of Example 3 of the utility model without the panel.

[0029] In the figure: 1. panel; 2. heat-conducting layer; 3. heating film; 4. metal tape; 5. heat-insulating layer; 6. first insulating layer; 7. graphene layer; 8. conductive layer; 9. second insulating layer; 10. first connecting layer; 11. second connecting layer; 13. insulating shell; 14. gap; 15. ground pin; 16. power cord; 17. electrode transition layer; 18. electrode hole; 19. controller; 20. temperature sensor. DETAILED DESCRIPTION

[0030] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0031] Embodiment 1:

[0032] This embodiment provides a heating film 3, such as Figure 1 , Figure 2 As shown, the heating film 3 includes a first insulating layer 6, a graphene layer 7 and a second insulating layer 9 from top to bottom. The graphene layer 7 is composed of a graphene channel, which has two ends and is continuously and evenly arranged; the duty cycle is 25% (the specific ratio is set according to the actual heating demand). The design of the first insulating layer 6 and the second insulating layer 9 ensures sealing while preventing leakage and protecting the graphene layer 7 from oxidation and scratches. The graphene channel can be designed into different patterns to achieve different impedances to meet the needs of different heating powers. The continuous and uniform arrangement can achieve uniform heating of the entire surface without local overheating. It can be evenly arranged in the heating area, which can make the heating effect of the warm food device better and output higher effective power. The duty cycle refers to the ratio of the area of ​​the graphene channel to the area of ​​the entire heating film 3. By controlling the duty cycle, the impedance of the heating film can be controlled within a reasonable range to achieve different power density requirements. It is also suitable for various shapes, especially special shapes.

[0033] The heating of the graphene layer 7 is surface heating, and the heat conduction is fast and uniform. Under the condition of outputting the same amount of heat, the temperature of graphene heating is much lower than the temperature of the resistance wire, so a greater power density can be achieved, realizing a faster heating rate and effective output power.

[0034] In order to conduct electricity reliably, Figure 3 , Figure 4 As shown, electrode transition layers 17 are provided at both ends of the graphene channel, and a wire (not shown in the figure) is provided on the electrode transition layer 17, and one end of the wire (not shown in the figure) is connected to the electrode transition layer 17; an electrode hole 18 is provided on the first insulating layer 6, and the electrode hole 18 is directly opposite to the electrode transition layer 17, and the electrode hole 18 is used for the wire to pass through. The electrode transition layer 17 is electrically connected to the outside world through the wire, and after being electrically connected to the outside world, the graphene layer 7 generates heat.

[0035] In order to improve the strength of the graphene layer 7, a conductive layer 8 is provided on the graphene layer 7, the graphene layer 7 and the conductive layer 8 are in contact, and the conductive layer 8 is used to carry the graphene layer 7 to prevent the graphene layer 7 from breaking; the conductive layer 8 cooperates with the graphene layer 7, and it is difficult to realize the pattern on the single graphene layer 7, which is easy to break and fall off, etc., while the graphene layer 7 is carried on the conductive layer 8, which can realize a refined pattern and is not easy to break and fail. The shape of the conductive layer 8 is the same as that of the graphene layer 7, which reduces the cost; the graphene layer 7 and the conductive layer 8 form a composite structure, that is, the graphene layer 7 is composited on the conductive layer 8; the conductive layer 8 uses a metal film to ensure that the graphene layer 7 is always conductive, and there will be no fault of the graphene layer 7 breaking and not conducting. The graphene layer 7 is attached to the conductive layer 8, and the metal film is aluminum foil, nickel-chromium aluminum foil or stainless steel foil. The conductive layer 8 is protected by the first insulating layer 6 and the second insulating layer 9, and can not be oxidized or scratched.

[0036] During processing, graphene is first coated on the conductive layer 8, and then cut together to form a graphene channel. This makes it difficult for the graphene layer 7 to break. At the same time, the conductive layer 8 and the graphene channel have a good fit and are easy to process. The impedance of the heating film can be easily adjusted to achieve different heating powers. The specific pattern formed by the graphene channel can be designed according to actual needs.

[0037] In order to improve the connection strength, a first connecting layer 10 is provided between the first insulating layer 6 and the graphene layer 7, and the first insulating layer 6 and the graphene layer 7 are connected through the first connecting layer 10; a second connecting layer 11 is provided between the conductive layer 8 and the second insulating layer 9, and the conductive layer 8 and the second insulating layer 9 are connected through the second connecting layer 11; the first connecting layer 10 adopts vacuum thermosetting adhesive; the second connecting layer 11 adopts vacuum thermosetting adhesive; the first insulating layer 6 adopts PI film, which is translucent, so that the graphene layer 7 can be observed; the second insulating layer 9 adopts PI film, which is translucent, so that the conductive layer 8 can be observed.

[0038] Embodiment 2:

[0039] This embodiment provides a heating component, such as Figure 6 As shown, from top to bottom, it includes a panel 1, a heat-conducting layer 2, a heating film 3 described in Example 1, and a heat-insulating layer 5. The heat-conducting layer 2 is arranged between the panel 1 and the heating film 3, and a metal tape 4 is arranged between the heating film 3 and the heat-insulating layer 5. In this embodiment, the upper and lower surfaces of the heat-conducting layer 2 are respectively in contact with the bottom surface of the panel 1 and the top surface of the heating film 3, and the upper and lower surfaces of the metal tape 4 are respectively in contact with the bottom surface of the heating film 3 and the top surface of the heat-insulating layer 5. The panel 1 is made of glass.

[0040] Panel 1 is used for outermost protection, which can prevent the intrusion of soup, etc., is easy to clean, and has good texture; the heat-conducting layer 2 can conduct heat evenly; the heating film 3 is used for heating; the metal tape 4 is used to fix the heating film 3, which is resistant to high temperature and has good insulation performance, and is arranged on the bottom surface of the heating film 3. The air at the bottom will be blocked by the metal tape 4 when it rises due to heat and cannot contact the heating film 3, protecting the heating film 3 from moisture and corrosion, and at the same time can use the heat at the bottom of the heating film 3 for heating and insulation; the thermal insulation layer 5 can reduce heat loss and prevent the bottom from overheating.

[0041] In order to ensure reliable heat conduction, the heat conducting layer 2 adopts heat conducting adhesive, which is easy to fill and can fix the panel 1 and the heating film 3; the metal tape 4 adopts aluminum film tape, which has good thermal conductivity and fits well with the heating film 3; the heat insulating layer 5 adopts nano-silicon dioxide aerogel and panel fiber material composite, and has good heat insulating effect.

[0042] In order to ensure the heat conduction effect, the projection of the heat conducting layer 2 on the horizontal plane completely covers the projection of the heating film 3 on the horizontal plane, the area of ​​the heat conducting layer 2 is not less than the area of ​​the heating film 3, and the heating film 3 can be completely attached to the heat conducting layer 2 to ensure the heat conduction effect; the projection of the edge of the heat conducting layer 2 on the horizontal plane exceeds the projection of the heating film 3 on the horizontal plane, the area of ​​the heat conducting layer 2 is larger than the area of ​​the heating film 3, and the heat emitted by the heating film 3 can diffuse to the entire heat conducting layer 2. The large area of ​​the heat conducting layer 2 also makes the external heating area large, which can expand the heating range as much as possible under the premise of ensuring the cost.

[0043] In order to ensure the thermal conductivity, Figure 5 As shown, the duty cycle is 35%; the projection of the metal tape 4 on the horizontal plane completely covers the projection of the heating film 3 on the horizontal plane, the area of ​​the metal tape 4 is not less than the area of ​​the heating film 3, and the heating film 3 can be completely attached to the metal tape 4 to ensure the heat conduction effect; the projection of the edge of the metal tape 4 on the horizontal plane exceeds the projection of the heating film 3 on the horizontal plane, the area of ​​the metal tape 4 is larger than the area of ​​the heating film 3, and the heat emitted by the heating film 3 can be diffused to the entire metal tape 4, and the large area of ​​the metal tape 4 also makes the external heating and heat preservation area of ​​the heating film 3 large, and at the same time, the metal tape 4 has a good fixing effect on the heating film 3.

[0044] In order to facilitate heat transfer, the edge of the metal tape 4 is in contact with the thermal conductive layer 2, so that the heat of the metal tape 4 can be transferred to the thermal conductive layer 2, and the heat generated by the bottom of the heating film 3 can also act on the thermal conductive layer 2, so that the overall thermal conductivity effect is better; the side of the heating film 3 is in contact with the metal tape 4, so that the upper and lower surfaces of the heating film 3 are respectively fixed by the thermal conductive layer 2 and the metal tape 4, and the side of the heating film 3 is fixed by the metal tape 4, so that the heating film 3 can be completely fixed.

[0045] Embodiment 3:

[0046] A heating component provided in this embodiment is obtained by removing the heat-conducting layer 2 on the basis of Embodiment 2, wherein the top surface of the heating film 3 is in contact with the panel 1, and the edge of the metal tape 4 is in contact with the panel 1, and the heat of the heating film 3 is directly transferred to the panel 1; the remaining technical features are the same as those in Embodiment 2.

[0047] Embodiment 4:

[0048] This embodiment provides a food warming device, such as Figure 7 , Figure 8 , Fig. 9 As shown, it includes a heating component and an insulating shell 13 described in Example 2 or Example 3, the panel 1 is connected to the insulating shell 13, and the heat insulation layer 5 is arranged between the panel 1 and the insulating shell 13. The insulating shell 13 is used to install and fix the heating component, improve the safety of use, and is convenient for placing on a desktop for use.

[0049] In order to increase the heating area, at least two heating components are provided. In this embodiment, three heating components are provided.

[0050] It also includes a controller 19, which can individually control the heating of each heating component. The controller 19 is electrically connected to the power line 16 and the graphene layer 7, respectively. The controller 19 is connected to the electrode transition layer 17 through a wire, and then electrically connected to the graphene layer 7. The controller 19 can control each heating component individually to achieve different heating temperatures in multiple heating areas to meet the requirements of different dishes for different heating temperatures. In this embodiment, the controller 19 is individually connected to the positive and negative electrodes of each heating component. Of course, the controller 19 can share a wire connection with the negative electrode of each heating component, which does not affect the individual control of the controller 19 over each heating component.

[0051] It also includes a temperature sensor 20, which is used to sense the heating temperature of the heating component, and the temperature sensor 20 is electrically connected to the controller 19. The temperature sensor 20 is arranged on the heating film 3 to facilitate temperature monitoring, so that the heating temperature is more accurate.

[0052] In order to improve the heat insulation performance, a gap 14 is provided between the heat insulation layer 5 and the insulating shell 13. The design of the gap 14 allows air insulation between the heat insulation layer 5 and the insulating shell 13, thereby improving the heat insulation performance.

[0053] In order to facilitate fixation, the bottom of the insulating housing 13 is provided with a foot 15. The design of the foot 15 facilitates fixation to the desktop and at the same time raises the bottom surface of the insulating housing 13, so that there is a gap between the bottom surface of the insulating housing 13 and the desktop, providing air insulation, which can reduce the impact of the food warming device on the desktop and allow air circulation for heat dissipation.

[0054] In order to facilitate heat dissipation, an exhaust hole (not shown in the figure) is provided on the insulating shell 13, and the exhaust hole (not shown in the figure) is used to balance the internal and external air pressure of the food warming device.

[0055] The power supply line 16 is also included, and the power supply line 16 is used to connect to the outside world for power supply.

[0056] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A heating component, characterized in that: The invention comprises a heating film (3), a panel (1) and at least one thermal insulation layer (5), wherein the heating film (3) is arranged between the panel (1) and the thermal insulation layer (5), the heating film (3) comprises, from top to bottom, a first insulating layer (6), a heating layer and a second insulating layer (9), the heating layer comprises a graphene layer (7) and a conductive layer (8); the graphene layer (7) is composed of graphene channels, the graphene channels have two ends, and the graphene channels between the two ends are continuously and evenly arranged; the graphene layer (7) is arranged on the conductive layer (8).

2. A heating assembly according to claim 1, characterized in that: The heat insulation layer (5) is a composite material layer of nano silicon dioxide aerogel and panel fiber material.

3. A heating assembly according to claim 1, characterized in that: Electrode transition layers (17) are provided at both ends of the graphene channel; an electrode hole (18) is provided on the first insulating layer (6), the electrode hole (18) is directly opposite to the electrode transition layer (17), and the electrode hole (18) is used for electrically connecting a wire to the electrode transition layer (17).

4. A heating assembly according to claim 1, characterized in that: The duty cycle of the graphene layer (7) is 25%-75%.

5. A heating assembly according to claim 1, characterized in that: The conductive layer (8) is made of a metal film.

6. A heating assembly according to claim 5, characterized in that: A first connecting layer (10) is provided between the first insulating layer (6) and the graphene layer (7), and the first insulating layer (6) and the graphene layer (7) are connected via the first connecting layer (10); a second connecting layer (11) is provided between the conductive layer (8) and the second insulating layer (9), and the conductive layer (8) and the second insulating layer (9) are connected via the second connecting layer (11).

7. A heating assembly according to claim 6, characterized in that: The first connection layer (10) is made of vacuum thermosetting adhesive; the second connection layer (11) is made of vacuum thermosetting adhesive; the first insulation layer (6) is made of PI film; and the second insulation layer (9) is made of PI film.

8. A food warming device, characterized in that: It comprises a heating component and an insulating shell (13) as claimed in any one of claims 1 to 7, wherein a heat insulating layer (5) is arranged between the heating film (3) and the insulating shell (13).

9. A food warming device according to claim 8, characterized in that: A gap (14) for airflow is provided between the heat insulation layer (5) and the insulating shell (13); a foot (15) is provided at the bottom of the insulating shell (13); and an exhaust hole is provided on the insulating shell (13).

10. The food warming device according to claim 8, characterized in that: The heating components are provided with at least two; the controller (19) is also included, and the controller (19) can control the heating of each heating component individually, and the controller (19) is electrically connected to the heating component; and the temperature sensor (20) is also included, and the temperature sensor (20) is used to sense the heating temperature of the heating component, and the temperature sensor (20) is electrically connected to the controller (19).

Images