Graphene heating module and preparation method

Abstract

The invention discloses a graphene heating module and a preparation method, the graphene heating module comprises a body, a graphene heating sheet is arranged in a pipeline of the body, the graphene heating sheet divides an inner cavity of the pipeline into a micro-channel for fluid to pass through, the width of the micro-channel in the direction of the cross section of the pipeline, namely the width of the micro-channel is 0.1-3mm, and the thickness of the micro-channel is 0.1-3mm. An electrode is arranged on the graphene heating sheet; the preparation method comprises the following steps: S1, laying fiber cloth on a substrate, and coating the fiber cloth with an insulating heat-conducting material; s2, curling the substrate to enable the substrate to drive the fiber cloth to be curled into a multilayer structure stacked in the radial direction; s3, a substrate is fixed, and the substrate and the fiber cloth form a curled graphene heating sheet after the insulation heat conduction material is cured; and S4, the substrate is disassembled, and the graphene heating sheet is arranged in the pipeline. According to the graphene heating module and the preparation method provided by the invention, the heating efficiency of the fluid medium can be improved by improving the arrangement position of the graphene heating sheet in the fluid medium.

Description

Technical Field

[0001] The present invention relates to the technical field of graphene heating equipment, and in particular to a graphene heating module and a preparation method thereof. Background Art

[0002] At present, the heating elements used for heating the flowing medium are generally resistance wire heating and electromagnetic heating. Among them, the principle of resistance wire heating is simple, the cost is low, and the popularity rate is high. However, the energy conversion efficiency of resistance wire heating is relatively low, and the heating speed is slow, and the temperature control accuracy is poor. In addition, resistance wire heating equipment has certain safety hazards. For example, the electric heating coil may produce open flames, which poses a fire hazard and the risk of high temperature burns. Electromagnetic heating uses an alternating magnetic field to induce eddy currents in the conductor to generate heat, and has a higher energy conversion efficiency, but the equipment cost of electromagnetic heating is high and the technical complexity is high.

[0003] With the development of graphene technology, the application of graphene heating sheets in the heating field is becoming more and more extensive. However, the existing application of graphene heating sheets in various heating equipment still adopts the structure and layout of resistance wire heating, for example, using graphene heating tubes or graphene heating plates to heat fluids. The contact interface area between the heating element and the load size is small, and the heat conduction path is long; as a result, the heat generated inside the heating element needs to be transferred to the surface of the heating element first and cannot be directly transferred to the load. The heat received on the load surface needs to be transferred to the inside of the load through a longer heat conduction path. This leads to problems such as low heating efficiency and uneven temperature inside and outside the load. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to at least a certain extent: to provide a graphene heating module and a preparation method, which can improve the heating efficiency of the fluid medium by improving the arrangement position of the graphene heating sheet in the fluid medium.

[0005] To this end, one purpose of the present invention is to propose a graphene heating module, which includes a main body with a pipe inside, a graphene heating plate is arranged in the pipe, and the graphene heating plate divides the inner cavity of the pipe into one or more microchannels for fluid to pass through, the microchannel extends axially and is connected to the inlet and outlet at both ends of the pipe, the width of the microchannel along the cross-sectional direction of the pipe is 0.1mm~3mm, and the graphene heating plate is limited in the pipe along the axial direction. Too small microchannel width will reduce the fluidity of the fluid, and easily cause heat accumulation in local positions and cause local high temperature; while too large microchannel width reduces the heating efficiency, so the microchannel width is set in the range of 0.1mm~3mm to obtain the best heating efficiency and ensure the fluidity of the fluid.

[0006] According to an example of the present invention, the thickness of the graphene heating sheet is 0.05mm~2mm. The thickness of the graphene heating sheet is the total thickness of the electrode, fiber cloth, continuous graphene film and insulating heat-conducting layer; the graphene heating sheet with a smaller thickness not only occupies less space in the pipeline and has less resistance to water flow, but also heats the water flowing in the microchannel in a surface heating manner, and has high heating efficiency.

[0007] According to an example of the present invention, the graphene heating sheet is a sheet structure, and there are multiple graphene heating sheets, which are arranged in parallel and spaced along the cross-sectional direction of the pipeline, and a microchannel is formed between any two adjacent graphene heating sheets, and pipe joints connected to the inlet and the outlet are respectively provided at both ends of the body. Multiple sheet-like graphene heating sheets can form a number of mutually parallel microchannels after being stacked in sequence along the thickness direction, so that the contact area is increased when the water in the pipeline passes through each microchannel, thereby improving the heating efficiency.

[0008] According to an example of the present invention, the graphene heating sheet is curled into a stacked multilayer structure along the cross-sectional direction of the pipeline, and a microchannel is formed between any two adjacent layers in the graphene heating sheet, and pipe joints connected to the inlet and the outlet are respectively provided at both ends of the body. The curled graphene heating sheet can separate the inner cavity of the pipeline into curled microchannels in the pipeline. When the fluid passes through the microchannel axially, not only is the contact area with the graphene heating sheet large, the heating efficiency is high, and the axially extending microchannel has a small resistance to the flow of the fluid.

[0009] According to an example of the present invention, the graphene heating sheet includes a graphene functionalized fiber cloth and an electrode for connecting an external power supply, the electrode is electrically connected to the graphene functionalized fiber cloth, the graphene functionalized fiber cloth includes a flexible fiber cloth, a continuous graphene film and an insulating heat-conducting layer, the continuous graphene film is attached to the fiber cloth in a graphene growth manner, and the insulating heat-conducting layer is coated on the fiber cloth and covers the continuous graphene film. The flexible fiber cloth can be conveniently curled so that the entire graphene heating sheet is curled into a roll that can be loaded into a pipeline.

[0010] According to an example of the present invention, the fiber cloth is a woven structure of one or more of plain, twill, satin, and mesh; the insulating thermal conductive layer is formed by curing the insulating thermal conductive material coated on the fiber cloth. The fiber cloth with a woven structure has a number of small holes, which can allow the insulating thermal conductive material to penetrate through the small holes to both sides of the fiber cloth after coating the insulating thermal conductive material, completely covering both sides of the fiber cloth, and forming an insulating thermal conductive layer after curing the insulating thermal conductive material, so that the continuous graphene film grown on the fiber cloth is located in the insulating thermal conductive layer.

[0011] According to an example of the present invention, the insulating thermally conductive material is one or more of resin, silica gel, and polysilazane.

[0012] According to an example of the present invention, a gasket is provided on the graphene heating sheet, and the gasket is arranged between two adjacent layers of the curled graphene heating sheet. The gasket can control the width of the microchannel between the two adjacent layers during the curling of the graphene heating sheet, so that the width of the microchannel remains consistent during the axial extension process.

[0013] According to an example of the present invention, the body is a tubular structure, at least one of the two pipe joints is detachably connected to the body, and the graphene heating sheet is axially limited between the two pipe joints. The disassembly of the pipe joint facilitates the loading and unloading of the graphene heating sheet, and the pipe joint can be connected to an external fluid pipeline.

[0014] To this end, the second object of the present invention is to provide a method for preparing the above-mentioned graphene heating module, characterized in that: the preparation method comprises the following steps S1, laying a fiber cloth with a continuous graphene film on a substrate, attaching one end of an electrode to the fiber cloth and electrically connecting it to the continuous graphene film, and then coating an insulating thermal conductive material on the fiber cloth and completely covering the continuous graphene film to obtain a graphene heating sheet with a substrate; S2, curling the substrate so that the substrate drives the graphene heating sheet to curl into a multi-layer structure stacked in the radial direction and matching the size of the pipeline; S3, fixing the substrate, and curing the insulating thermal conductive material after curing time t1 to obtain a formed curled graphene heating sheet, wherein t1 is 4 to 15 hours; S4. Disassemble the substrate and install the graphene heating sheet into the pipeline.

[0015] In the preparation method, the fiber cloth is curled synchronously during the process of combining the insulating thermally conductive material with the fiber cloth to form the glass fiber reinforced plastic. Therefore, a curled graphene heating sheet can be obtained after the insulating thermally conductive material is cured.

[0016] According to an example of the present invention, after step S1 and before step S2, the gasket is attached to a preset position of the fiber cloth, and in step S2, the gasket is clamped between two adjacent layers of the curled substrate. The gasket can be used to make the distance between the two adjacent layers after curling consistent with the thickness of the gasket during the curling of the substrate, and the curled graphene heating sheet with different microchannel widths can be obtained by selecting gaskets of different thicknesses.

[0017] The above technical solution has the following advantages or beneficial effects: firstly, the graphene heating sheet in the pipeline can divide the inner cavity of the pipeline into one or more microchannels, so that the contact area is increased, and because the graphene heating sheet heats the water flow it contacts in a surface heating manner, the overall heating efficiency is high; secondly, the graphene heating sheet in the pipeline is in a curled shape, so that the curled graphene heating sheet can divide the inner cavity of the pipeline into microchannels with a curled cross section, and when the fluid passes through the microchannel along the axial direction, it not only contacts the graphene heating sheet, but also The contact area is large, the heating efficiency is high, and the resistance to fluid flow is small; secondly, the fiber cloth in the graphene heating sheet is multi-layered, thereby improving the heating efficiency of the graphene heating sheet; secondly, the two adjacent layers in the curled graphene heating sheet are separated by a gasket, and the gasket fixes the width of the microchannel between the two layers; finally, in the process of combining the fiber cloth and the insulating thermal conductive material to form the graphene heating sheet, the fiber cloth is curled into the required roll shape, and at this time, the curled graphene heating sheet can be obtained after the insulating thermal conductive material is cured.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a graphene heating module in which the graphene heating sheet of the present invention adopts a curled structure.

[0020] Figure 2 for Figure 1 Section view along the “AA” direction.

[0021] Figure 3 for Figure 2 A partial enlarged schematic diagram of the "B" area in the middle.

[0022] Figure 4 for Figure 2 Schematic diagram of the three-dimensional structure.

[0023] Figure 5 for Figure 4 Schematic diagram of the flattened structure of the graphene heating sheet.

[0024] Figure 6 Schematic diagram of the internal structure of the graphene heating plate in the thickness direction.

[0025] Figure 7 for Figure 1 Block diagram of the graphene heating module preparation method.

[0026] Figure 8 It is a structural schematic diagram of a graphene heating module in which the graphene heating sheet of the present invention adopts a multi-sheet structure.

[0027] Fig. 9 for Figure 8 Schematic diagram of the internal structure of the graphene heating module.

[0028] Fig.10 for Figure 8 Block diagram of the graphene heating module preparation method.

[0029] Wherein, 100, body; 101, pipeline; 200, graphene heating sheet; 300, pipe joint; 1. Fiber cloth; 2. Continuous graphene film; 3. Insulating thermal conductive layer; 4. Gasket; 5. Substrate. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] The graphene heating module and the preparation method according to the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] The present invention provides a graphene heating module, as shown in the figure, which includes a body 100, the body 100 has a pipe 101 for fluid to pass through, and a graphene heating plate 200 is arranged in the pipe 101. The graphene heating plate 200 divides the inner cavity of the pipe 101 into one or more microchannels for fluid to pass through. The microchannels extend axially and are connected to the inlet and outlet at both ends of the pipe 101. The width of the microchannel along the cross-sectional direction of the pipe 101, that is, the width of the microchannel, is 0.1mm~3mm, and the graphene heating plate 200 is limited in the pipe 101 along the axial direction. It should be understood that the graphene heating plate 200 in this embodiment is electrically connected to an external power supply through an electrode.

[0033] Based on one of the preferred examples of the graphene heating sheet 200 in the above embodiment: the graphene heating sheet 200 is a flat sheet structure, a plurality of graphene heating sheets 200 are arranged in sequence and parallel to each other along the thickness direction, the plurality of graphene heating sheets 200 are fixed to each other, so that a microchannel is formed between any two adjacent graphene heating sheets 200, each graphene heating sheet 200 is electrically connected to each other, the plurality of graphene heating sheets 200 are installed into the pipeline 101 along the axial direction of the pipeline 101, and the electrode sheets on the graphene heating sheet 200 are electrically connected to the external power supply through the mounting holes on the side wall of the pipeline 101, and the mounting holes are provided with insulating glue for blocking the mounting holes. Preferably, as the number of graphene heating sheets 200 increases, the number of microchannels also increases, and each microchannel can be connected or separated along the cross-sectional direction of the pipeline, and both ends of each microchannel extending along the axial direction of the pipeline 101 are connected to the inlet and outlet at both ends of the pipeline 101.

[0034] Based on the second preferred example of the graphene heating sheet 200 in the above embodiment: the graphene heating sheet 200 is a multi-layer structure that is curled into a stacked structure along the cross-sectional direction of the pipeline 101, and a microchannel is formed between any two adjacent layers in the graphene heating sheet 200, and the two ends of the body 100 are respectively provided with pipe joints 300 connected to the inlet and the outlet. The graphene heating sheet 200 in this embodiment is curled into a stacked multi-layer structure along the cross-sectional direction, which means that the sheet-like graphene heating sheet 200 is continuously curled upward or downward along one edge of itself in the thickness direction to form a curled shape with a spiral line in the cross section, and the curled graphene heating sheet 200 is divided into multiple layers along the radial direction of the pipeline cross section, and a microchannel for fluid to flow through is formed between two adjacent layers, and the microchannel between any two adjacent layers extends along the cross-sectional direction of the pipeline and is connected to each other to form a rolled structure, and the two ends of the microchannel extending along the axial direction of the pipeline 101 are connected to the inlet and outlet at both ends of the pipeline 101.

[0035] In the above embodiment, the graphene heating sheet 200 needs to be powered on to convert electrical energy into heat energy. In order to enable an external power source to provide electrical energy to the graphene heating sheet 200, specifically, the electrode sheet extends through the tube wall of the body 100 to the outside of the pipeline 101, thereby being electrically connected to the external power source. At the same time, in order to electrically isolate the electrode from the fluid in the pipeline 101, a mounting through hole for the electrode to pass through is provided on the tube wall of the body 100, and an insulating glue for sealing the mounting through hole is provided in the mounting through hole, thereby isolating the electrode sheet from the fluid inside the pipeline 101.

[0036] Preferably, if Figure 1 , Figure 2 and Figure 4As shown, the body 100 is a tubular structure, with a pipe 101 inside the body 100, an inlet and an outlet at both ends, and pipe joints 300 are respectively provided on the inlet and the outlet, at least one of the two pipe joints 300 is detachably connected to the body 100, so that the graphene heating sheet 200 can be inserted into the pipe 101 axially through the inlet or the outlet after curling, and the pipe joint 300 is fixedly connected to the end of the body 100, so that the graphene heating sheet 200 is limited between the two pipe joints 300 along the axial direction.

[0037] Based on the preferred embodiment of the graphene heating sheet 200, as shown in FIG. Figure 6 As shown, the graphene heating plate 200 includes a graphene functionalized fiber cloth and an electrode for connecting to an external power source, the electrode is electrically connected to the graphene functionalized fiber cloth, the graphene functionalized fiber cloth includes a flexible fiber cloth 1, a continuous graphene film 2 and an insulating thermal conductive layer 3, the continuous graphene film 2 is attached to the fiber cloth 1 in the form of graphene growth, and the insulating thermal conductive layer 3 is coated on the fiber cloth 1 and covers the continuous graphene film 2.

[0038] The continuous graphene film 2 in the above embodiment refers to a continuous single-layer or multi-layer graphene film layer grown on the surface of the substrate by chemical vapor deposition, epitaxial growth, scanning electromagnetic induction ultrafast growth, etc. The thickness of the continuous graphene film 2 is between a few nanometers and tens of nanometers, and because graphene is formed in a growth manner, the layered graphene film grown on the substrate is continuous, so it is called a continuous graphene film 2, also known as a continuous graphene film with nanometer-level thickness. Preferably, the preparation method disclosed in Publication No. CN113840801A is used to form a continuous graphene film with nanometer-level thickness on the surface of the substrate. This continuous graphene film with nanometer-level thickness is different from the graphene slurry layer formed by the existing thick film coating process. The graphene slurry layer is mostly millimeter-level thick. And because the graphene slurry layer is first formed into a slurry by mixing graphene powder with a solvent and then coating the slurry on a substrate, although the graphene slurry layer also has a layered structure, it is thicker and is not a continuous graphene film.

[0039] The fiber cloth 1 in the above embodiment is one or more of glass fiber, quartz fiber, ceramic fiber, basalt fiber, mica fiber, and BN fiber.

[0040] Furthermore, the fiber cloth 1 is a woven structure of one or more types such as plain, twill, satin, and mesh. The fiber cloth 1 having the woven structure has a plurality of small holes. The fiber cloth 1 is coated with an insulating thermally conductive material, and the insulating thermally conductive material forms an insulating thermally conductive layer 3 after solidification. The insulating thermally conductive material is combined with the fiber cloth 1 and solidified to form a glass fiber reinforced plastic. The glass fiber reinforced plastic is a sheet-like structure, and the portion of the glass fiber reinforced plastic that is coated outside the continuous graphene film 2 serves as the insulating thermally conductive layer 3. In this embodiment, since the fiber cloth 1 is a woven structure with small holes, such as a mesh-like woven structure, the liquid insulating thermally conductive material can penetrate through the small holes on the fiber cloth 1 when coated on the fiber cloth 1, so that the upper and lower surfaces of the entire fiber cloth 1 are coated with the insulating thermally conductive material. After the insulating thermally conductive material is solidified, the continuous graphene film 2 on the fiber cloth 1 can be completely coated in the insulating thermally conductive layer 3.

[0041] In order to improve the heating power of the single-sheet graphene heating sheet 200, the improvement of this embodiment is that: there are multiple fiber cloths 1 in the graphene heating sheet 200, and the multiple fiber cloths 1 are stacked in the thickness direction, and the continuous graphene films 2 on any two adjacent fiber cloths 1 are arranged at intervals. Specifically, there is a partition formed by curing the resin between any two adjacent fiber cloths 1.

[0042] Further, the fiber cloth 1 is divided into a graphene fiber cloth with a continuous graphene film 2 grown thereon and a glass fiber cloth without a continuous graphene film 2 grown thereon, and the multilayer fiber cloth 1 in the graphene heating sheet 200 includes two glass fiber cloths and at least one graphene fiber cloth located between the two glass fiber cloths. Furthermore, when there are at least two graphene fiber cloths, a glass fiber cloth is provided between any two adjacent graphene fiber cloths, and the glass fiber cloth and the graphene fiber cloth are alternately provided along the thickness direction.

[0043] In the second preferred example of the above-mentioned graphene heating sheet 200, since the graphene heating sheet 200 is curled into a multi-layer structure radially stacked along the pipeline 101, a microchannel is formed between the inner layer and the outer layer of any two adjacent layers in the graphene heating sheet 200. In order to maintain the width of the microchannel, the improvement of this embodiment is that: a gasket 4 is provided on the graphene heating sheet 200, and the gasket 4 is arranged between two adjacent layers in the curled graphene heating sheet 200, and is used to limit the microchannel width d1 between two adjacent layers in the graphene heating sheet 200. In this embodiment, the thickness of the gasket 4 is fixed, and the gasket 4 is attached to the upper end surface of the graphene heating sheet 200. When one side of the graphene heating sheet 200 is curled upward, the lower end surface of the graphene heating sheet 200 is curled to the position of the gasket 4 and then abuts against the gasket 4, thereby clamping the gasket 4 between two adjacent layers in the graphene heating sheet 200. Finally, the microchannel width d1 between the two adjacent layers of the curled graphene heating sheet 200 at the position of the gasket 4 matches the thickness of the gasket 4.

[0044] Preferably, the thickness of the gasket 4 is 0.1 mm to 3 mm. Specifically, the thickness of the gasket 4 is any one of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm. Preferably, the gasket 4 is made of a heat-resistant material with good thermal conductivity, and specifically, the gasket 4 is a stainless steel gasket 4.

[0045] Preferably, the thickness of the graphene heating sheet 200 is 0.05 mm to 2 mm. Specifically, the thickness of the graphene heating sheet 200 is 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0046] Further, the gasket 4 is multiple, one side of the multiple gaskets 4 is bonded to the graphene heating sheet 200 or one side of the gasket 4 is attached to the insulating thermally conductive material during the curing process of the insulating thermally conductive material, and the gasket 4 is fixedly connected to the graphene heating sheet 200 as the insulating thermally conductive material is cured. It should be understood that the specific pasting positions of the multiple gaskets 4 can be calculated in advance by the diameter of the pipe 101, the thickness of the graphene heating sheet 200, and the number of turns of the graphene heating sheet 200. The positions of the gaskets 4 can be obtained by simple calculation, so they are not listed one by one in this embodiment.

[0047] It should be understood that in one of the preferred examples of the graphene heating sheet 200, as Figure 8and Fig. 9 As shown, after a plurality of sheet-like graphene heating sheets 200 are stacked in sequence along their thickness direction, a microchannel can be formed between any two adjacent graphene heating sheets 200. The arrangement of the plurality of graphene heating sheets 200 is along the cross-sectional direction of the pipeline, and the microchannel formed thereby extends axially and connects the inlet and outlet located at both ends of the pipeline. In order to maintain the microchannel width d2 between any two adjacent graphene heating sheets 200, that is, to ensure that the microchannel width d2 is constant, the improvement of this embodiment is that: one or more gaskets 4 are provided between any two adjacent graphene heating sheets 200. In this embodiment, the thickness of the gasket 4 is fixed. When the gasket 4 is fixed between two adjacent graphene heating sheets 200, the microchannel width d2 can be kept consistent with the thickness of the gasket 4.

[0048] Preferably, the thickness of the gasket 4 is 0.1 mm to 3 mm. Specifically, the thickness of the gasket 4 is any one of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, and 3 mm. Preferably, the gasket 4 is made of a heat-resistant material with good thermal conductivity, and specifically, the gasket 4 is a stainless steel gasket 4.

[0049] Preferably, the thickness of the graphene heating sheet 200 is 0.05 mm to 2 mm. Specifically, the thickness of the graphene heating sheet 200 is 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm.

[0050] Preferably, in the above embodiment, since the graphene heating sheet 200 is a plurality of graphene heating sheets 200 having a sheet structure and stacked in sequence along the thickness direction, Figure 8 and Fig. 9 As shown, the body 100 is a square structure, and the inside of the body 100 has a square pipe 101, and each graphene heating sheet 200 is stacked in sequence along the width direction of the body 100, and a microchannel of constant width is formed between any two adjacent graphene heating sheets 200 through a gasket 4. It should be understood that the multiple graphene heating sheets 200 in this embodiment can be stacked and fixed in the thickness direction and then placed in the body 100 together, or each graphene heating sheet 200 can be placed in the body 100 in sequence.

[0051] Based on the fact that the graphene heating sheet 200 in the above embodiment adopts the graphene heating module of the second preferred example, the present invention provides a method for preparing the graphene heating module in the above embodiment, such as Figure 7 As shown, the preparation method comprises the following steps: S1, laying the fiber cloth 1 with the continuous graphene film 2 on the substrate 5, attaching one end of the electrode to the fiber cloth 1 and electrically connecting it to the continuous graphene film 2, and then coating the fiber cloth 1 with an insulating thermal conductive material and completely covering the continuous graphene film 2 to obtain a graphene heating sheet 200 with the substrate 5; S2, curling the substrate 5, so that the substrate 5 drives the graphene heating sheet 200 to curl into a multi-layer structure stacked in the radial direction, and the outer contour of the curled graphene heating sheet 200 matches the size of the pipe 101, so that the manufactured graphene heating sheet 200 can be placed in the corresponding pipe 101; S3, fixing the substrate 5, and curing the insulating thermal conductive material after curing time t1 to obtain a formed curled graphene heating sheet 200, wherein t1 is 4 to 15 hours; S4, dismantle the substrate 5 and install the graphene heating plate 200 into the pipe 101.

[0052] Based on the preference of the above-mentioned insulating thermally conductive material, the insulating thermally conductive material includes but is not limited to one or more of resin, silicone, and polysilazane. Furthermore, when selecting materials such as resin or silicone as the insulating thermally conductive material, due to the process requirements of curing the insulating thermally conductive material, the resin or silicone contains a curing agent. Therefore, in step S1 of the above-mentioned preparation method, it is necessary to first mix the curing agent with the corresponding insulating thermally conductive material before using the insulating thermally conductive material for coating. Specifically, if the insulating thermally conductive material is a resin, the curing agent can use a commercially available conventional curing agent for achieving resin curing, which includes but is not limited to polyetheramine curing agent, ethylenediamine, hexamethylenediamine, diethylenetriamine, cyclohexylamine, and metaphenylenediamine; if the insulating thermally conductive material is silicone, the corresponding curing agent is XR-500. The usage ratio of the curing agent to the resin or silicone is 1 part of the curing agent to 1 to 5 parts of the resin or silicone.

[0053] In the above embodiment, the graphene heating sheet 200 needs to be curled, and for this purpose, a large piece of quartz fiber cloth with a plain weave structure and a continuous graphene film 2 is cut into a size of 1000mm*100mm using a laser cutting machine. The selected substrate 5 is slightly larger than the size of the above quartz fiber cloth 1, and the substrate 5 is preferably 1100mm*150mm.

[0054] The resin contains a curing agent in the following steps: epoxy resin and ethylenediamine are selected, and the epoxy resin and ethylenediamine are mixed in a ratio of 4:1 and stirred evenly. For example, the epoxy resin is 160 grams, the ethylenediamine is 40 grams, and the total is 200 grams.

[0055] In the above embodiment, the electrode is preferably a 1200mm*10mm copper foil tape, and the copper foil tape is brushed with silver paste within the 1000mm size of the quartz fiber cloth 1. The copper foil tape brushed with silver paste is applied to both sides of the fiber cloth and pressed tightly, and then placed in an oven and baked at 75°C for 30 minutes, so that the copper foil tape is fixedly connected to the quartz fiber cloth 1, and the copper foil tape is electrically connected to the continuous graphene film 2 on the quartz fiber cloth 1.

[0056] Preferably, in the above step S4, the substrate 5 needs to be disassembled so that the substrate 5 is detached from the graphene heating plate 200. In order to facilitate the smooth detachment of the substrate 5 from the graphene heating plate 200, a release agent, such as methylethoxysilane release agent, can be applied on both sides of the substrate 5 before the above step S1, and left to stand for 5 minutes. The release agent allows the graphene heating plate 200 to be better detached from the substrate 5 in step S5.

[0057] The release agent is an existing commercially available product, including but not limited to R-9520 release agent, TM-003 release agent, methyl silicone oil, methylphenyl silicone oil, methylchlorosilane, methylethoxysilane, etc.

[0058] In the above step S2, after the substrate 5 is rolled up and the graphene heating sheet 200 is rolled up into a radially stacked multi-layer structure, the substrate 5 is fixed so that the substrate 5 maintains the current rolled state. Specifically, the rolled substrate 5 is tightly wrapped with a fixing tape so that the substrate 5 maintains the rolled state.

[0059] The curing time t1 in the above step S3 is preferably 12 hours.

[0060] After step S1 and before step S2 , the gasket 4 is attached to a preset position of the quartz fiber cloth 1 , and in step S2 , the gasket 4 is clamped between two adjacent curled layers of the substrate 5 .

[0061] There are multiple fiber cloths 1 in the graphene heating plate 200. In step S1, the first fiber cloth 1 is first laid on the substrate 5, and then the resin containing the curing agent is coated on the first fiber cloth 1. The remaining fiber cloths 1 are laid on the first fiber cloth 1 in sequence, and the resin is coated on the previous fiber cloth 1 before any fiber cloth 1 is laid.

[0062] Preferably, the fiber cloth 1 includes a graphene fiber cloth with a continuous graphene film 2 grown on the fiber cloth in a graphene growth manner, and a glass fiber cloth without a continuous graphene film 2. There are three of the above-mentioned fiber cloths 1, and the three fiber cloths 1 are two glass fiber cloths and one graphene fiber cloth. The glass fiber cloth is first placed on the substrate 5, and a resin after curing agent is applied to form a uniform resin layer, and then the graphene fiber cloth is laid, and then the resin layer is applied on the graphene fiber cloth, and finally the second glass fiber cloth is laid to form a three-layer structure. In this embodiment, when multiple gaskets 4 need to be placed, the gaskets 4 are placed on the top layer of the glass fiber cloth at intervals after the second glass fiber cloth is laid, and finally the substrate 5 and the fiber cloth on the substrate 5 are curled into a roll.

[0063] In the above step S4, the substrate 5 and the graphene heating sheet 200 are first disassembled, and then the graphene heating sheet 200 is cut and polished to make the edge of the graphene heating sheet 200 flat, and then the cut and polished graphene heating sheet 200 sample is placed in the corresponding pipe 101, and then a hole is punched on the pipe wall of the pipe 101 at the position corresponding to the electrode sheet of the graphene heating sheet 200, so that the electrode sheet of the graphene heating sheet 200 extends out of the hole, and the pore between the hole and the electrode sheet is sealed with a silicone material, and finally the pipe joint 300 is fixed to both ends of the pipe 101. When the fluid is water, the pipe joints 300 at both ends of this graphene heating module of this embodiment can be connected to an ordinary water pipe, and the two pipe joints 300 serve as interfaces for water inlet and outlet. The external power supply can be a 220V voltage of the mains. After providing a 200V voltage to the graphene heating sheet 200, the water in the pipe 101 can be heated, and hot water flows out of the pipe joint 300 serving as the water outlet.

[0064] Based on the graphene heating sheet 200 in the above embodiment using one of the preferred examples of the graphene heating module, the present invention provides a method for preparing the graphene heating module in the above embodiment, such as Fig.10 As shown, the preparation method comprises the following steps: Q1. Lay the fiber cloth 1 with the continuous graphene film 2 on the substrate 5, attach one end of the electrode to the fiber cloth 1 and electrically connect it to the continuous graphene film 2, and then coat the fiber cloth 1 with an insulating thermal conductive material and completely cover the continuous graphene film 2 to obtain a graphene heating sheet 200 with the substrate 5; Q2, after the curing time t2, the insulating thermal conductive material is cured to obtain a formed curled graphene heating sheet 200, wherein t2 is 4 to 15 hours; Q3. Disassemble the substrate 5, and then stack the obtained multiple graphene heating sheets 200 along the thickness direction and install them into the square pipe 101.

[0065] Based on the preference of the above-mentioned insulating thermally conductive material, the insulating thermally conductive material includes but is not limited to one or more of resin, silicone, and polysilazane. Furthermore, when selecting materials such as resin or silicone as the insulating thermally conductive material, due to the process requirements of curing the insulating thermally conductive material, the resin or silicone contains a curing agent. Therefore, in step Q1 of the above-mentioned preparation method, it is necessary to first mix the curing agent with the corresponding insulating thermally conductive material before coating with the insulating thermally conductive material. Specifically, if the insulating thermally conductive material is a resin, the curing agent can use a commercially available conventional curing agent for achieving resin curing, which includes but is not limited to polyetheramine curing agent, ethylenediamine, hexamethylenediamine, diethylenetriamine, cyclohexylamine, and metaphenylenediamine; if the insulating thermally conductive material is silicone, the corresponding curing agent is XR-500. The usage ratio of the curing agent to the resin or silicone is 1 part of the curing agent to 1 to 5 parts of the resin or silicone.

[0066] In the above embodiment, a large piece of quartz fiber cloth 1 with a plain weave structure and a continuous graphene film 2 is cut into 10 pieces of fiber cloth with a size of 100 mm*100 mm using a laser cutting machine.

[0067] The resin contains a curing agent in the following steps: epoxy resin and ethylenediamine are selected, and the epoxy resin and ethylenediamine are mixed in a ratio of 4:1 and stirred evenly. For example, the epoxy resin is 160 grams, the ethylenediamine is 40 grams, and the total is 200 grams.

[0068] In the above embodiment, the electrode is preferably a 120mm*10mm copper foil tape. The copper foil tape brushed with silver paste is applied to both sides of the quartz fiber cloth 1 and pressed tightly, and then placed in an oven and baked at 75°C for 30 minutes, so that the copper foil tape is fixedly connected to the quartz fiber cloth 1, and the copper foil tape is electrically connected to the continuous graphene film 2 on the quartz fiber cloth 1.

[0069] Preferably, in the above step Q3, the substrate 5 needs to be disassembled so that the substrate 5 is detached from the graphene heating plate 200. In order to facilitate the smooth detachment of the substrate 5 from the graphene heating plate 200, a release agent, such as methylethoxysilane release agent, can be applied on both sides of the substrate 5 before the above step Q1, and left to stand for 5 minutes. The release agent allows the graphene heating plate 200 to be better detached from the substrate 5 in step Q3.

[0070] The release agent is an existing commercially available product, including but not limited to R-9520 release agent, TM-003 release agent, methyl silicone oil, methylphenyl silicone oil, methylchlorosilane, methylethoxysilane, etc.

[0071] The curing time t2 in the above step Q2 is preferably 12 hours.

[0072] After step Q1 and before step Q2, the gasket 4 is attached to a preset position of the fiber cloth 1, that is, multiple gaskets 4 are evenly distributed on the fiber cloth, so that when multiple graphene heating plates 200 are stacked on each other in step Q3, the gasket 4 can be clamped between two adjacent graphene heating plates 200.

[0073] There are multiple fiber cloths 1. In step Q1, the first fiber cloth 1 is first laid on the substrate 5, and then the resin containing the curing agent is coated on the first fiber cloth 1. The remaining fiber cloths 1 are laid on the first fiber cloth 1 in sequence, and the resin is coated on the previous fiber cloth 1 before any fiber cloth 1 is laid.

[0074] Preferably, the fiber cloth 1 includes a graphene fiber cloth with a continuous graphene film 2 grown on the fiber cloth by graphene growth, and a glass fiber cloth without a continuous graphene film 2. There are three of the above fiber cloths 1, and the three fiber cloths 1 are two glass fiber cloths and one graphene fiber cloth. The glass fiber cloth is first placed on the substrate 5, and a resin after curing agent is applied to form a uniform resin layer, and then the graphene fiber cloth is laid, and then the resin layer is applied on the graphene fiber cloth, and finally the second glass fiber cloth is laid to form a three-layer structure. In this embodiment, when multiple gaskets 4 need to be placed, the gaskets 4 are placed on the top layer of the glass fiber cloth at intervals after the second glass fiber cloth is laid.

[0075] In the above step Q3, the substrate 5 and the graphene heating sheet 200 are first disassembled, and then the graphene heating sheet 200 is cut and polished to make the edge of the graphene heating sheet 200 flat, and then the cut and polished graphene heating sheet 200 sample is placed in the corresponding square pipe 101, and then a hole is punched on the pipe wall of the pipe 101 at the position corresponding to the electrode of the graphene heating sheet 200, so that one end of the electrode of the graphene heating sheet 200 extends out of the hole, and the gap between the hole and the electrode is sealed with a silicone material. Fig. 9 As shown, circular holes are punched on one side of the upper and lower ends of the square box pipe 101 parallel to the direction of the graphene heating plate 200 to fix the water inlet pipe and the water outlet pipe at both ends. When the fluid is water, the water inlet and water outlet interfaces can be used to put in and discharge water. The external power supply can be a 220V voltage of the mains. After providing a 220V voltage to the graphene heating plate 200, the water in the pipe 101 can be heated, and hot water flows out from the pipe joint 300 serving as the water outlet.

[0076] Based on the second preferred example of the graphene heating sheet in the above embodiment, the graphene heating sheet 200 is a multilayer structure curled into a stacked structure along the cross-sectional direction of the pipeline 101. A total of 5 graphene heating sheets 200 are selected, and the thicknesses of the selected graphene heating sheets are 0.05mm, 0.1mm, 0.2mm, 0.5mm, 1mm, and 2mm, respectively, and the resistance is 30.8Ω. Then, graphene heating modules with different microchannel widths are sequentially formed according to the preparation process; different graphene heating modules are placed under the same test conditions, that is, the test voltage is 220v and the rated power is 1500w, and the heating effect of the graphene heating module of this embodiment on water in a pipeline of the same size and shape is tested; the comparative example selected is a quick-heating faucet purchased from the market at the same power (SUPOR / Supor model 270147-01-CP), and the voltage regulator is adjusted to make it also reach 1500W power, and the initial water temperature is 15°C, and the water temperature heating effect at the same flow rate is tested:

[0077] Through the above comparative experiments, it is found that the heating effect of the microchannel width d1 of the graphene heating sheet 200 in the above embodiment is set to 0.1mm, 0.25mm, 0.5mm, 1mm and 2mm, which is greater than that of the SUPOR / Supor model 270147-01-CP instant hot water faucet in Comparative Example 1; however, when the microchannel width d1 of the graphene heating sheet 200 reaches 3mm, its heating effect is equivalent to that of the SUPOR / Supor model 270147-01-CP, see Comparative Example 1 and Example 6; in addition, when the microchannel width d1 of the graphene heating sheet 200 is less than 0.1mm, see Comparative Example 2, because the microchannel width d1 is too small, the water flow is not smooth at the same flow rate, and the effect is not obvious. If the water flow rate is to be guaranteed, the water pressure will be too high, and the internal part of the heater will be damaged. If the water does not pass through in time to take away the heat, the local temperature will rise, which will also cause internal damage to the heater.

[0078] Based on one of the preferred examples of the graphene heating sheet in the above embodiment, the graphene heating sheet 200 is a sheet structure, and 10 graphene heating sheets 200 with thicknesses of 0.05 mm, 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, and 2 mm and a resistance of 300 Ω are selected. After 10 graphene heating sheets 200 of the same thickness are connected in parallel, the resistance is 30 Ω, and then graphene heating modules with different microchannel widths are formed according to the preparation process; different graphene heating modules are placed under the same test conditions, that is, the test voltage is 220 V and the rated power is 1500 W, and the flow rate and heating efficiency under different microchannel widths d2 are tested by adjusting the microchannel spacing between adjacent graphene heating sheets 200:

[0079] It should be noted here that in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0080] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0081] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0085] For those skilled in the art, various changes and modifications will undoubtedly be obvious after reading the above description. Therefore, the attached claims should be regarded as covering all changes and modifications to the true intent and scope of the present invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to still be within the intent and scope of the present invention.

Claims

1. A graphene heating module, characterized in that: The invention comprises a body (100) having a pipeline inside, wherein a graphene heating plate (200) is arranged inside the pipeline (101), wherein the graphene heating plate (200) divides the inner cavity of the pipeline (101) into one or more microchannels for fluid to pass through, wherein the microchannels extend axially and are connected to an inlet and an outlet at both ends of the pipeline (101), wherein the width of the microchannels along the cross-sectional direction of the pipeline (101) is 0.1 mm to 3 mm, and the graphene heating plate (200) is axially limited inside the pipeline (101).

2. The graphene heating module according to claim 1, characterized in that: The graphene heating sheet (200) has a thickness of 0.05 mm to 2 mm.

3. The graphene heating module according to claim 1, characterized in that: The graphene heating sheet (200) is a sheet-like structure. There are a plurality of graphene heating sheets (200), and the plurality of graphene heating sheets (200) are arranged in parallel and at intervals along the cross-sectional direction of the pipeline (101). A microchannel is formed between any two adjacent graphene heating sheets (200). Pipe joints (300) communicating with an inlet and an outlet are respectively provided at both ends of the body (100).

4. The graphene heating module according to claim 1, characterized in that: The graphene heating sheet (200) is curled into a stacked multilayer structure along the cross-sectional direction of the pipeline (101), and a microchannel is formed between any two adjacent layers in the graphene heating sheet (200). Both ends of the body (100) are respectively provided with pipe joints (300) connected to an inlet and an outlet.

5. The graphene heating module according to claim 3 or 4, characterized in that: The graphene heating sheet (200) comprises a graphene functionalized fiber cloth and an electrode for connecting to an external power source, the electrode being electrically connected to the graphene functionalized fiber cloth, the graphene functionalized fiber cloth comprising a flexible fiber cloth (1), a continuous graphene film (2) and an insulating heat-conducting layer (3), the continuous graphene film (2) being attached to the fiber cloth (1) in a graphene growth manner, and the insulating heat-conducting layer (3) being coated on the fiber cloth (1) and covering the continuous graphene film (2).

6. The graphene heating module according to claim 5, characterized in that: The fiber cloth (1) is a woven structure of one or more types including plain, twill, satin and grid; The insulating heat-conducting layer (3) is formed by curing the insulating heat-conducting material coated on the fiber cloth (1).

7. The graphene heating module according to claim 6, characterized in that: The insulating heat-conducting material is one or more of resin, silica gel and polysilazane.

8. The graphene heating module according to claim 3 or 4, characterized in that: A gasket (4) is provided on the graphene heating sheet (200), and the gasket is arranged between two adjacent layers of the curled graphene heating sheet (200).

9. The graphene heating module according to claim 4, characterized in that: The body (100) is a tubular structure, at least one of the two pipe joints (300) is detachably connected to the body (100), and the graphene heating plate (200) is axially limited between the two pipe joints (300).

10. A method for preparing the graphene heating module according to claim 5, characterized in that: The preparation method comprises the following steps S1, laying a fiber cloth (1) with a continuous graphene film (2) on a substrate (5), attaching one end of an electrode to the fiber cloth (1) and electrically connecting the electrode to the continuous graphene film (2), and then coating an insulating thermal conductive material on the fiber cloth (1) and completely covering the continuous graphene film (2) to obtain a graphene heating sheet (200) with a substrate (5); S2, curling the substrate (5) so that the substrate (5) drives the graphene heating sheet (200) to curl into a multi-layer structure stacked in a radial direction and matching the size of the pipeline (101); S3, fixing the substrate (5), and curing the insulating thermal conductive material after a curing time t1 to obtain a formed curled graphene heating sheet (200), wherein t1 is 4 to 15 hours; S4, disassembling the substrate (5) and installing the graphene heating plate (200) into the pipe (101).

11. The preparation process according to claim 10, characterized in that: After step S1 and before step S2, the gasket (4) is attached to a preset position of the fiber cloth (1), and in step S2, the gasket (4) is clamped between two adjacent curled layers of the base sheet (5).

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