Novel high-temperature graphene heating plate

Abstract

The utility model relates to the technical field of graphene heating plates, and discloses a novel high-temperature graphene heating plate, which comprises a main body comprising an upper shell structure, a graphene heating plate electric heating core arranged at the bottom of the upper shell structure, and a reflective thermal insulation layer arranged above the graphene heating plate electric heating core and positioned in an inner cavity of the upper shell structure; the elastic electrode pressing sheets are arranged on the two sides of the upper portion of the graphene heating plate electric heating core, and the tops of the elastic electrode pressing sheets are connected with electrode wires. According to the utility model, the structure of the radiation window is adopted, temperature-resistant and wave-transparent materials are selected, and the infrared characteristic of graphene can be effectively exerted.

Description

Technical Field

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

[0002] Currently, planar thin-film surface heating plates have gained attention due to their advantages such as uniform thermal field, small size, and flexible heterogeneous structure. Their composition includes a heat-resistant substrate, electrodes, high-temperature electrothermal ink, and an insulating layer. These heating plates typically operate at temperatures below 300℃ and have a service life of less than 5000 hours. While sacrificing service life, the maximum temperature can reach 500℃, resulting in a drastically shortened lifespan.

[0003] Among these products, graphene is a representative material with significant infrared radiation characteristics. However, due to its low effective operating temperature, short lifespan when exposed to air, and the fact that its surface is covered by an insulating layer, the infrared characteristics of the electrothermal heating material itself are limited. Therefore, it cannot meet the requirements of devices in the full temperature range for consumer appliances and industrial equipment, nor can it maximize the advantages of electrothermal infrared irradiation devices.

[0004] For example, existing products include a microcrystalline coated electric heating plate, a ceramic insulating coating (optional), electrode silver paste strips, and power cords. The microcrystalline coated electric heating plate consists of a microcrystalline plate and a graphene conductive coating cured on the surface of the microcrystalline plate. The electrode silver paste strips are cured on the outer edges of the graphene conductive coating on both sides, and the ceramic insulating coating is cured on the graphene conductive coating. The power cords are connected to the electrode silver paste strips on both sides, and it can be used when powered on.

[0005] However, existing products still have the following problems:

[0006] 1. Existing technologies, as described in the background section above, have low operating temperatures and short lifespans;

[0007] 2. Existing products of this type have an insulating layer covering the graphene surface, which limits the expression of infrared properties;

[0008] 3. The electrode materials used in existing technologies have limited lifespans, and matching them with the thermal expansion coefficients of graphene elastic layers presents significant challenges. These factors all affect the lifespan and corresponding infrared performance of existing graphene heating plates. Utility Model Content

[0009] The purpose of this invention is to solve the problems existing in the prior art by proposing a novel high-temperature graphene heating plate.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A novel high-temperature graphene heating plate includes:

[0012] The main body includes an upper shell structure, a graphene heating plate heating core disposed at the bottom of the upper shell structure, and a reflective heat insulation layer disposed above the graphene heating plate heating core and located in the inner cavity of the upper shell structure.

[0013] Elastic electrode plates are set on both sides above the heating core of the graphene heating plate, and electrode wires are connected to the top of the elastic electrode plates.

[0014] Preferably, the electrode wire passes through the upper housing structure and connects to a wire connector mounted on the top of the upper housing structure.

[0015] Preferably, the graphene heating plate heating element includes a radiation window and a graphene carbon film layer disposed on top of the radiation window, and the elastic electrode pressure plate is disposed on the graphene carbon film layer.

[0016] Preferably, the upper shell structure is made of ceramic.

[0017] Preferably, the connection between the graphene heating plate heating core and the upper shell structure is sealed by firing with ceramic slurry.

[0018] Preferably, the reflective heat insulation layer is made of stainless steel plate with a lens for infrared reflection, and it is fixed in the inner cavity of the upper shell structure in an embedded form.

[0019] Preferably, a thermocouple is installed inside the reflective heat insulation layer to monitor the temperature of the graphene heating plate heating core.

[0020] Preferably, the elastic electrode pressure plate is a metal spring.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This invention firstly adopts a radiation window structure and selects temperature-resistant and wave-transparent materials, which can effectively utilize the infrared properties of graphene.

[0023] In addition, the graphene heating plate uses a radiation window and a sealed upper shell structure to form a vacuum / inert gas heating space, which can exert infrared characteristics and effectively improve the temperature and service life of the graphene planar heating plate, making the structure robust.

[0024] Meanwhile, the electrode of this utility model adopts a metal spring, and the ceramic structure and graphene are effectively contacted by the metal spring through the designed fixing structure. It can be used as soon as it is powered on, and the cost is significantly reduced compared to silver paste. Moreover, the existing silver paste strip cannot withstand high temperatures greater than 600°C. Attached Figure Description

[0025] Figure 1 This is a front view of a novel high-temperature graphene heating plate proposed in this utility model.

[0026] In the figure: 1. Upper shell structure; 2. Reflective heat insulation layer; 3. Elastic electrode pressure plate; 4. Electrode wire; 5. Radiation window; 6. Graphene carbon film layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Reference Figure 1 A novel high-temperature graphene heating plate includes:

[0029] The main body includes an upper shell structure 1, a graphene heating plate heating core disposed at the bottom of the upper shell structure 1, and a reflective heat insulation layer 2 disposed above the graphene heating plate heating core and located in the inner cavity of the upper shell structure 1.

[0030] The elastic electrode pressing plate 3 is set on both sides above the heating core of the graphene heating plate, and the top of the elastic electrode pressing plate 3 is connected to the electrode wire 4, which is made of nickel.

[0031] In this embodiment, the electrode wire 4 passes through the upper housing structure 1 and connects to the wire connector mounted on the top of the upper housing structure 1.

[0032] In this embodiment, the graphene heating plate heating core includes a radiation window 5 and a graphene carbon film layer 6 disposed on top of the radiation window 5, and the elastic electrode pressure plate 3 is disposed on the graphene carbon film layer 6.

[0033] In this embodiment, the upper shell structure 1 is made of a ceramic layer composite high-temperature heat-insulating cotton layer, which can effectively insulate heat and increase the energy of the radiation window.

[0034] In this embodiment, the reflective heat insulation layer 2 is made of high-temperature resistant mirror stainless steel, close to the heating core of the graphene heating plate, and is used for infrared reflection. It is fixed in the inner cavity of the upper shell structure 1 in an embedded form.

[0035] In this embodiment, a thermocouple is installed inside the reflective heat insulation layer 2 to monitor the temperature of the graphene heating plate heating core.

[0036] In this embodiment, the elastic electrode pressure plate 3 is a metal spring, and the embedded structure mechanically fixes the mirror stainless steel plate and effectively isolates it from the elastic electrode pressure plate 3 to avoid circuit abnormalities.

[0037] Compared to existing technologies, this heating plate adopts a structure with a radiation window 5 and uses heat-resistant and wave-transparent materials. In this embodiment, quartz glass is used, which can effectively utilize the infrared properties of graphene.

[0038] In addition, the graphene heating plate uses a radiation window 5 and an upper shell structure 1 in a sealed combination to form a vacuum / inert gas heating space, which can exert infrared characteristics and effectively improve the temperature and service life of the graphene planar heating plate, making the structure robust.

[0039] Meanwhile, the electrode of this utility model adopts a metal spring made of nickel. The ceramic structure and graphene are effectively contacted by the metal spring through a designed fixing structure. It can be used as soon as it is powered on. The cost is significantly reduced compared to silver paste. Moreover, the existing silver paste tape cannot withstand high temperatures above 600°C, which this product can solve.

[0040] This product can achieve:

[0041] 1. Raise the temperature of the graphene planar heating plate to over 600℃; This function is achieved by improving the chemical stability of the heating element components through structural sealing, thus preventing oxidation, and allowing for greater power input to raise the temperature.

[0042] 2. Increase the lifespan of graphene planar heating plates to over 20,000 hours; this is achieved by sealing the structure to improve the chemical stability of the heating element components and prevent oxidation, allowing for greater power input to raise the temperature.

[0043] 3. Fill the gap in the market for high-temperature, long-life planar graphene heating plates.

[0044] In addition, in this embodiment, the connection between the graphene heating plate heating core and the upper shell structure 1 is sealed by firing with ceramic slurry. That is, the two parts are sintered by gap fitting control and glue sintering sealing: the upper part is pre-fired (the infrared reflective stainless steel plate is embedded and fired together during the pre-fired process), after the firing is completed, the bottom graphene heating plate and elastic electrode pressing sheet 3 are embedded into the upper shell structure 1 in a vacuum environment, and at the same time, ceramic slurry is covered at the connection between the graphene heating plate and the ceramic structure. Then, it is placed in a mold in a vacuum environment for final firing to form a blank. Finally, the outer surface of the ceramic wrapping is brushed with colored glaze and fired again to seal.

[0045] It can also reserve exhaust holes (not shown in the figure), maintenance holes (for replenishing argon gas) (not shown in the figure), and thermocouple holes (with reserved thermocouple positions inside, allowing for precise temperature control during the use of the heating plate, and playing a better role in some scenarios requiring precise temperature control) (not shown in the figure), while the graphene carbon film layer 6 uses an electrode structure to fix the lead wires.

[0046] Of course, in another embodiment, the graphene heating plate heating core can be connected to the upper shell structure 1 by a vertical through bolt, and the connection between the graphene heating plate heating core and the upper shell structure 1 can be sealed by an expanding adhesive, as long as a seal can be achieved.

[0047] Graphene heating principle: Graphene, being virtually defect-free, possesses a perfect Dirac cone band structure, enabling it to effectively convert energy into infrared radiation. When an electric current is applied, the virtually defect-free graphene exhibits excellent conductivity and extremely high carrier mobility. When current is input, free electrons move rapidly under the influence of the electric field. These electrons collide and scatter with carbon atoms. The energy generated in this process is partly released directly as infrared radiation and partly released as heat to raise the temperature of the graphene heating element, thus being released as thermal radiation.

[0048] Furthermore, graphene, being virtually defect-free, has strong carbon-carbon covalent bonds with small carbon atoms, resulting in high sound velocity for phonons and a high thermal conductivity. When energized, it can rapidly and uniformly raise the temperature of the heating element, assisting the graphene heating element in releasing energy more quickly. Within the same structure, for the device of this invention, this translates to rapidly reaching a higher target temperature.

[0049] Working principle: After the electrode wire 4 is energized, the graphene carbon film layer 6 begins to excite free electrons to collide and scatter with carbon atoms, generating energy. Part of this energy is released directly in the form of infrared radiation, and part of it provides the temperature of the graphene heating element as thermal energy, which is then released in the form of thermal radiation. Thus, radiation and heat are sensed in the radiation window 5 and applied to relevant scenarios.

[0050] During this process, the reflective heat insulation layer 2 reflects infrared radiation in that direction, thereby enhancing the radiation intensity and heat of the unidirectional radiation window 5 and reducing energy loss in the other direction. The upper shell structure 1 also has corresponding heat preservation and insulation functions, simultaneously enhancing the energy of the radiation window.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel high temperature graphene heating plate characterized by: The utility model relates to a graphene heating plate, which comprises a main body, an elastic electrode pressing sheet and an electrode lead wire. The electrode lead wire passes through the upper shell structure and is connected with a lead wire connecting seat installed on the top of the upper shell structure. The graphene heating plate electric heating core comprises a radiation window and a graphene carbon film layer arranged on the top of the radiation window, and the elastic electrode pressing sheet is arranged on the graphene carbon film layer.

2. A novel high temperature graphene heating plate according to claim 1, characterized in that: The upper shell structure is made of ceramic structure.

3. A novel high temperature graphene heating plate according to claim 1, characterized in that: The connecting part of the graphene heating plate electric heating core and the upper shell structure is sealed by ceramic slurry firing.

4. A novel high temperature graphene heating plate according to claim 1, characterized in that: The graphene heating plate electric heating core and the upper shell structure are connected by a vertical penetrating bolt, and the connecting part of the graphene heating plate electric heating core and the upper shell structure is sealed by expansion glue.

5. A novel high temperature graphene heating plate according to claim 4, characterized in that: The reflective heat insulation layer is made of a mirror stainless steel plate for infrared reflection and is fixed in the inner cavity of the upper shell structure in an embedded form.

6. A novel high temperature graphene heating plate according to claim 1, characterized in that: A thermocouple is installed in the reflective heat insulation layer for monitoring the temperature of the graphene heating plate electric heating core.

7. A novel high temperature graphene heating plate according to claim 1 characterized by: The elastic electrode pressing sheet is made of a metal reed.

8. A novel high temperature graphene heating plate according to claim 7, characterized by: ​ 9. A novel high temperature graphene heating plate according to claim 1 characterized by: ​

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