A portable graphene heating plate

Abstract

The utility model provides a kind of portable graphene heating plate, including the composite heat insulating plate and film substrate that are sequentially laminated from bottom to top, the upper end surface of the film substrate is coated with heating paint layer, the upper surface of the heating paint layer is equipped with positive electrode and negative electrode, and the upper surface of the heating paint layer is covered with PI adhesive tape layer except electrode contact area, the heating plate is divided into heating zone and heat preservation zone from inside to outside, the upper surface of the film substrate is respectively punched into shape with several deep notches and several shallow notches in the heating zone and heat preservation zone, the heating paint layer is respectively shaped with deep concave line and shallow concave line corresponding to each deep notch and shallow notch, the positive electrode annularly covers on the heating zone, the lower surface of the positive electrode is equipped with long projection matched with deep concave line position, the negative electrode annularly covers on the heat preservation zone, the lower surface of the negative electrode is equipped with short projection matched with shallow concave line position. The utility model relates to the technical field of graphene heating plate.

Description

Technical Field

[0001] This utility model relates to the field of graphene heating plate technology, and in particular to a portable graphene heating plate. Background Technology

[0002] In recent years, with the development of portable electric heating technology, graphene heating plates have been increasingly used in tourism and camping scenarios due to their lightweight and high thermal conductivity. Existing technology, patent announcement number CN209767841U, proposes a portable graphene heating plate that enhances heat concentration by setting a groove structure on the film substrate, achieving a maximum temperature of 115℃ when powered by a 5V power bank, thus meeting both heating and steaming needs. While this solution improves upon traditional electric stoves or gas stoves in terms of portability and thermal efficiency, it still has significant limitations.

[0003] The inventors' in-depth analysis revealed that existing graphene heating plates, due to their uniform groove design, suffer from insufficient heat distribution uniformity and faster heat dissipation at the edges. At the same time, the limited contact area between the planar electrodes and the grooves makes it difficult to further raise the core area temperature to the 150°C threshold required for efficient steaming and cooking under low voltage. In addition, the single temperature zone structure of the entire plate cannot meet the needs of complex scenarios that require both high-temperature heating (such as boiling water) and low-temperature heat preservation (such as food warming), thus limiting the user experience.

[0004] Therefore, the inventors urgently need a portable graphene heating plate to achieve the coordinated operation of 150°C high-temperature steaming and edge insulation under a 5V portable power supply, so as to completely solve the problems of insufficient upper temperature limit and unbalanced heat field distribution in the existing technology. Utility Model Content

[0005] To address the shortcomings of the existing technology, this utility model provides a portable graphene heating plate, which aims to solve the problems of insufficient upper temperature limit (unable to reach 150℃), uneven heat distribution, and inability to achieve zoned temperature control caused by the uniform groove design and planar electrode structure of the existing graphene heating plate.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a portable graphene heating plate, comprising a composite heat insulation plate and a membrane substrate stacked sequentially from bottom to top. The upper surface of the membrane substrate is coated with a heating coating layer. The upper surface of the heating coating layer is provided with a positive electrode and a negative electrode, and the upper surface of the heating coating layer, except for the electrode contact area, is covered with a PI tape layer. The heating plate is divided into a heating zone and a heat preservation zone from the inside out. The upper surface of the membrane substrate is stamped with a plurality of deep grooves and a plurality of shallow grooves in the heating zone and the heat preservation zone, respectively. The heating coating layer is formed with deep grooves and shallow grooves corresponding to each deep groove and shallow groove, respectively. The positive electrode is annularly covered on the heating zone, and the lower surface of the positive electrode is provided with long protrusions matching the positions of the deep grooves. The negative electrode is annularly covered on the heat preservation zone, and the lower surface of the negative electrode is provided with short protrusions matching the positions of the shallow grooves.

[0007] Based on the above, the beneficial effects of a portable graphene heating plate are that it solves the problems of insufficient upper temperature limit (unable to reach 150℃), uneven heat distribution, and inability to achieve zoned temperature control caused by the uniform groove design and planar electrode structure of existing graphene heating plates; mainly reflected in:

[0008] 1. This utility model achieves a differentiated heat conduction path between the heating zone and the insulation zone by forming deep and shallow grooves on the membrane substrate through stamping. This solves the problem of inability to control temperature in different zones.

[0009] 2. This utility model increases the current contact area and local current density in the heating zone by embedding long protrusions into deep grooves on the lower surface of the positive electrode, thereby achieving a stable output at a high temperature of 150℃ and solving the problem of insufficient upper temperature limit.

[0010] 3. This utility model uses a positive electrode with a wave-shaped closed-loop structure to cover the heating area and align the wave crests with the deep concave texture, which optimizes the uniform distribution of current in the heating area and achieves uniform heat diffusion in the heating area, thus solving the problem of uneven heat distribution.

[0011] Furthermore, the depth of the deep groove is greater than the depth of the shallow groove, and the opening width of the deep groove is less than the opening width of the shallow groove. Both the deep groove and the shallow groove have a U-shaped cross-section.

[0012] Based on the above, the beneficial effect of the deeper groove being greater than the shallower groove is that the depth difference allows the deep concave texture of the heating zone to form a more significant heat accumulation cavity, achieving a higher heat concentration in the heating zone than in the insulation zone, directly supporting the requirements of zoned temperature control; the beneficial effect of the deeper groove having a smaller opening width than the shallower groove is that the width difference limits the lateral heat diffusion range of the heating zone, achieving vertical strengthening of the core thermal field of the heating zone and a smooth transition of the thermal field of the insulation zone, solving the problem of excessively rapid heat dissipation at the edges.

[0013] Furthermore, the height of the long protrusion is greater than the depth of the deep concave pattern, the height of the short protrusion is equal to the depth of the shallow concave pattern, and the bottom of the long protrusion and the short protrusion has a curved surface structure.

[0014] Based on the above, the beneficial effect of the height of the long bump being greater than the depth of the deep groove is that the height difference allows the long bump to generate continuous contact pressure when pressed into the deep groove, achieving close physical contact between the positive electrode and the heating coating layer in the heating zone, directly improving the local current conduction efficiency. The beneficial effect of the height of the short bump being equal to the depth of the shallow groove is that the height matching allows the short bump to completely fill the shallow groove space, achieving full-surface contact between the negative electrode and the heating coating layer in the insulation zone, ensuring stable current transmission in the edge area. The beneficial effect of the curved bottom of the long and short bumps is that the curved bottom can eliminate stress concentration points at the edges, realizing the transformation from line contact between the bump and the sidewall of the groove to surface contact, avoiding damage to the coating structure under thermal expansion at 150℃.

[0015] Furthermore, the positive electrode has a wavy closed-loop structure, and the peak of the positive electrode is aligned with the deep concave texture, while the negative electrode has a circular ring structure.

[0016] Based on the above, the beneficial effects of the wavy closed-loop structure of the positive electrode are that it eliminates the endpoints of the current path by eliminating the current path, realizing a continuous ring-shaped current field distribution in the heating zone, and solving the problem of heat attenuation at the end of the traditional straight electrode; the beneficial effect of aligning the peak position of the positive electrode with the position of the deep concave texture is that the current density peak area covers the core of the deep concave texture heat source by aligning the positions, realizing the optimal spatial matching of heat generation and accumulation, and directly improving the high-temperature stability at 150℃; the beneficial effect of the circular ring structure of the negative electrode is that it realizes the equidistant current input in the entire circumference of the heat preservation zone, ensuring the uniformity of edge temperature.

[0017] Furthermore, the density of the heating zone of the composite insulation board is greater than the density of the insulation zone.

[0018] Based on the above, the beneficial effect of the density of the heating zone corresponding to the composite insulation board being greater than that of the insulation zone is that the heating zone obtains higher mechanical strength support through the density gradient, realizing the resistance to deformation during steaming and pressure, and ensuring structural integrity under high temperature conditions of 150℃; the beneficial effect of the density of the insulation zone corresponding to the composite insulation board being less than that of the heating zone corresponding to the composite insulation board is that the low-density area forms a porous heat-insulating microstructure, which effectively blocks the heat loss from the insulation zone to the environment.

[0019] Furthermore, the PI tape layer has breathable micropores on the surface of the heating zone.

[0020] Based on the above, the beneficial effect of having breathable micropores on the surface of the PI tape layer in the heating zone is that the micropore structure runs through the thickness direction of the PI tape layer, realizing a directional escape channel for water vapor in the deep grooves, and avoiding coating peeling caused by steam accumulation under the cooking conditions.

[0021] Furthermore, the heating coating layer comprises a graphene and carbon nanotube composite material.

[0022] Furthermore, the positive and negative electrodes are connected to a portable power supply via wires.

[0023] Furthermore, the operating temperature of the heating zone is higher than that of the insulation zone.

[0024] To more clearly illustrate the above-mentioned features of this utility model and the objectives it aims to achieve, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1 This is an exploded view of the present invention.

[0026] Figure 2 This is a top view schematic diagram of the installation of the positive and negative electrodes of this utility model;

[0027] Figure 3 : This is a schematic diagram of the PI tape layer of this utility model.

[0028] Explanation of reference numerals: 1-Heating zone, 2-Insulation zone, 3-Composite insulation board, 4-Membrane substrate, 41-Deep groove, 42-Shallow groove, 5-Heating coating layer, 51-Deep groove, 52-Shallow groove, 6-Positive electrode, 61-Long protrusion, 7-Negative electrode, 71-Short protrusion, 8-PI tape layer, 81-Breathable micropores. Detailed Implementation

[0029] like Figures 1-3As shown, a portable graphene heating plate includes a composite heat insulation plate 3 and a membrane substrate 4 stacked sequentially from bottom to top. The upper surface of the membrane substrate 4 is coated with a heating coating layer 5. The upper surface of the heating coating layer 5 is provided with a positive electrode 6 and a negative electrode 7, and the upper surface of the heating coating layer 5, except for the electrode contact area, is covered with a PI tape layer 8. The heating plate is divided into a heating zone 1 and a heat preservation zone 2 from the inside out. The upper surface of the membrane substrate 4 is stamped with a plurality of deep grooves 41 and a plurality of shallow grooves 42 in the heating zone 1 and the heat preservation zone 2, respectively. The heating coating layer 5 is formed with deep grooves 51 and shallow grooves 52 corresponding to each deep groove 41 and shallow groove 42, respectively. The positive electrode 6 is annularly covered on the heating zone 1, and the lower surface of the positive electrode 6 is provided with long protrusions 61 that match the position of the deep grooves 51. The negative electrode 7 is annularly covered on the heat preservation zone 2, and the lower surface of the negative electrode 7 is provided with short protrusions 71 that match the position of the shallow grooves 52.

[0030] In this embodiment, the depth of the deep groove 41 is greater than the depth of the shallow groove 42, and the opening width of the deep groove 41 is less than the opening width of the shallow groove 42. The cross-sections of the deep groove 41 and the shallow groove 42 are both U-shaped structures. The depth of the deep groove 41 is 0.5-1.0 mm and the opening width is 1-2 mm. The depth of the shallow groove 42 is 0.2-0.4 mm and the opening width is 2-3 mm.

[0031] In this embodiment, the height of the long protrusion 61 is greater than the depth of the deep concave texture 51, the height of the short protrusion 71 is equal to the depth of the shallow concave texture 52, and the bottom of the long protrusion 61 and the short protrusion 71 is a curved surface structure.

[0032] In this embodiment, the positive electrode 6 has a wavy closed-loop structure, and the peak of the positive electrode 6 is aligned with the position of the deep groove 51. The negative electrode 7 has a circular ring structure.

[0033] In this embodiment, the density of the heating zone 1 of the composite heat insulation board 3 is greater than the density of the insulation zone 2. The density of the central area of ​​the heating zone 1 of the composite heat insulation board 3 is 200-300 kg / m³, and the density of the edge area of ​​the insulation zone 2 of the composite heat insulation board 3 is 80-150 kg / m³.

[0034] In this embodiment, the PI tape layer 8 has breathable micropores 81 on the surface of the heating zone 1. The pore diameter of the breathable micropores 81 is 0.1-0.5 mm and the pore density is 12 pores / cm².

[0035] In this embodiment, the heating coating layer 5 comprises a composite material of graphene and carbon nanotubes.

[0036] In this embodiment, the positive electrode 6 and the negative electrode 7 are connected to a portable power source via wires. The portable power source is a 5V power bank. After being powered on, the center temperature of the heating zone 1 reaches 150±5℃, and the temperature of the heat preservation zone 2 is maintained at 80-100℃.

[0037] In this embodiment, the operating temperature of the heating zone 1 is higher than that of the heat preservation zone 2.

[0038] In summary, the specific embodiments of this utility model are as follows:

[0039] When the portable power supply is connected to the positive electrode 6 and the negative electrode 7 through the wires, the current is injected into the deep groove 51 of the heating zone 1 from the long protrusion 61 on the lower surface of the positive electrode 6. The long protrusion 61 is pressed into the groove because its height is greater than the depth of the deep groove 51, so that the current is concentrated on the heating coating layer 5 at the bottom of the deep groove 51, forming a high heat density area in the center of the heating zone 1. At the same time, the positive electrode 6 with the wave-shaped closed-loop structure is aligned with the deep groove 51 through the wave crest, ensuring that the current evenly covers all the deep grooves 51 along the closed-loop path, generating a continuous high temperature field.

[0040] The current is conducted laterally through the heating coating layer 5 to the insulation zone 2, and is received by the short protrusion 71 on the lower surface of the negative electrode 7. The short protrusion 71 is attached to the surface of the shallow groove 52 with a height equal to the depth of the shallow groove 52, so that the current is evenly diffused to the heating coating layer 5 of the insulation zone 2. The composite heat insulation board 3 supports the high temperature load through the high-density area corresponding to the heating zone 1, and the low-density area corresponding to the insulation zone 2 suppresses the heat dissipation. The breathable micropores 81 of the PI tape layer 8 discharge the steam generated in the deep groove 51. Finally, the temperature of the heating zone 1 rises to 150℃, and the insulation zone 2 is maintained at 80-100℃, realizing zoned temperature control.

[0041] The above description is only the optimal solution embodiment of this utility model and is not intended to limit this utility model. Various modifications or substitutions made by those skilled in the art to this utility model without departing from the essence and protection scope of this utility model should also be within the protection scope of this utility model.

Claims

1. A portable graphene heating plate, characterized in that: The device comprises a composite heat insulation plate (3) and a membrane substrate (4) stacked sequentially from bottom to top. The upper surface of the membrane substrate (4) is coated with a heating coating layer (5). The upper surface of the heating coating layer (5) is provided with a positive electrode (6) and a negative electrode (7). The upper surface of the heating coating layer (5), except for the electrode contact area, is covered with a PI tape layer (8). The heating plate is divided into a heating zone (1) and a heat preservation zone (2) from the inside out. The upper surface of the membrane substrate (4) has several deep grooves stamped into the heating zone (1) and the heat preservation zone (2), respectively. 41) and several shallow grooves (42), the heating coating layer (5) is formed with deep grooves (51) and shallow grooves (52) respectively corresponding to each deep groove (41) and shallow groove (42), the positive electrode (6) is circumferentially covered on the heating area (1), the lower surface of the positive electrode (6) is provided with long protrusions (61) matching the position of the deep grooves (51), the negative electrode (7) is circumferentially covered on the heat preservation area (2), the lower surface of the negative electrode (7) is provided with short protrusions (71) matching the position of the shallow grooves (52).

2. The portable graphene heating plate according to claim 1, characterized in that: The depth of the deep groove (41) is greater than the depth of the shallow groove (42), and the opening width of the deep groove (41) is less than the opening width of the shallow groove (42). The cross-sections of the deep groove (41) and the shallow groove (42) are both U-shaped structures.

3. A portable graphene heating plate according to claim 1, characterized in that: The height of the long protrusion (61) is greater than the depth of the deep concave pattern (51), and the height of the short protrusion (71) is equal to the depth of the shallow concave pattern (52). The bottom of the long protrusion (61) and the short protrusion (71) are curved surfaces.

4. A portable graphene heating plate according to claim 1, characterized in that: The positive electrode (6) has a wave-shaped closed-loop structure, and the peak position of the positive electrode (6) is aligned with the position of the deep groove (51). The negative electrode (7) has a circular ring structure.

5. A portable graphene heating plate according to claim 1, characterized in that: The density of the heating zone (1) of the composite insulation board (3) is greater than the density of the insulation zone (2).

6. A portable graphene heating plate according to claim 1, characterized in that: The PI tape layer (8) has breathable micropores (81) on the surface of the heating zone (1).

7. A portable graphene heating plate according to claim 1, characterized in that: The heating coating layer (5) comprises a graphene and carbon nanotube composite material.

8. A portable graphene heating plate according to claim 1, characterized in that: The positive electrode (6) and negative electrode (7) are connected to a portable power supply via wires.

9. A portable graphene heating plate according to claim 1, characterized in that: The operating temperature of the heating zone (1) is higher than that of the insulation zone (2).

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