Electric heating panel and electric heating system

Abstract

The present invention provides an electric heating panel and an electric heating system. The electric heating panel comprise a panel body. The panel body comprises, successively arranged, a bottom layer, a thermal insulation layer, a self-regulating heating body, a conductive shielding layer, an insulating layer and a surface layer, the surface layer being an A-grade flame-retardant material layer and being constituted by a metal plate, and the bottom layer being an A-grade flame-retardant material layer. The electric heating panel provided in the present invention is particularly suitable for wall heating renovation or ceiling heating renovation, not only allows for convenient construction, but also has an excellent flame-retardant effect, is less prone to deformation such as hollowing after long-time use, and fundamentally solves the problem that overlarge leakage current results in the tripping of leakage protectors.

Description

An electric heating panel and electric heating system Technical Field

[0001] This application relates to the field of electric heating technology, specifically to an electric heating panel and an electric heating system. Background Technology

[0002] With societal development, people have increasingly higher demands for the comfort of their living environment, with indoor temperature control being a crucial aspect. To meet this need, various heating devices have emerged, among which electric wall heating panels are a new type of heating method that has gained popularity in recent years. Compared to traditional air conditioning heating, they offer advantages such as faster heating, higher heating comfort, and no drafts in the room. Compared to retrofitted underfloor heating, they eliminate the need to replace flooring, are easier to install, and provide faster heating, making them a promising option for the market.

[0003] Traditional electric wall heating panels typically consist of a panel body and a frame surrounding the panel body. The panel body includes a bottom layer, a heating film, and a surface layer. The surface layer is usually made of materials such as wood, cotton cloth, or plastic. These products often fail to meet flame retardant standards, making them highly susceptible to overheating and causing significant safety hazards. Furthermore, the wall panels are prone to hollowing and deformation, insufficient insulation, or even the absence of an insulation layer and grounding electrode, leading to excessive leakage current and tripping of the circuit breaker.

[0004] In the existing technology, some solutions have been proposed, such as using materials with higher fire resistance (such as epoxy board, jute and other B1-level flame retardant materials) to replace the wood panel surface, or adding reinforcing ribs on the back of the bottom layer for support, in order to prevent the wall panel from hollowing and deforming.

[0005] However, in practical applications, many problems still exist:

[0006] 1) Although existing fireproof materials can improve the fire resistance of wall heating systems to some extent, they still cannot meet the requirements of Class A flame retardancy.

[0007] 2) Although the existing reinforcing rib structure can reduce the occurrence of hollowing, after long-term use, the thermal expansion and contraction of the finishing material may still cause hollowing.

[0008] 3) The existing structure cannot fundamentally solve the problem of leakage current of distributed capacitors, and leakage protection tripping may still occur;

[0009] 4) The existing structure lacks a reliable grounding device, which does not meet the requirements of the 3C standard;

[0010] 5) The existing structure uses a high-power heating system, which poses a safety problem of local overheating and potential fire. Summary of the Invention

[0011] Purpose of the invention: In order to overcome the shortcomings of the existing technology, an electric heating plate and electric heating system with good flame retardant effect and not easily deformed after long-term use are provided. The electric heating plate is very suitable for wall heating renovation or ceiling heating renovation.

[0012] Technical solution: To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0013] An electric heating panel includes a panel body, which comprises a bottom layer, an insulation layer, a self-regulating heating element, a conductive shielding layer, an insulating layer, and a surface layer arranged sequentially. The surface layer is a Class A flame-retardant material layer and is made of a metal plate, the metal plate having a porous structure inside. The bottom layer is a Class A flame-retardant material layer.

[0014] By applying the above solutions, not only does the electric heating board have excellent flame-retardant properties, but it is also less prone to deformation such as hollowing after long-term use. At the same time, it fundamentally solves the problem of leakage current tripping due to excessive leakage current.

[0015] In some specific embodiments, the power density of the self-regulating heating element is 100 W / m². 2 ~1500W / m 2 And the PTC intensity of the self-limiting heating element is: R 50 / R 20 A value greater than or equal to 1 ensures that the electric heating plate not only has good heating effect but also has self-limiting temperature characteristics, making it safer.

[0016] Preferably, the power density of the self-regulating heating element is 200 W / m³. 2 ~800W / m 2 The PTC strength: R 50 / R 20 Greater than or equal to 2.5. And the PTC strength: R 80 / R 20 Greater than or equal to 8.

[0017] In some specific embodiments, the self-regulating heating element is a self-regulating heating film or a self-regulating ceramic heating element.

[0018] In this invention, the Class A flame-retardant material refers to the Class A non-combustible building material as specified in the Chinese national standard GB8624-2012.

[0019] In this invention, the "self-limiting temperature heating element" refers to a heating element whose resistance increases with temperature. After reaching a certain temperature, the resistance becomes so high that it almost blocks the current, thereby achieving the effect of automatic temperature limiting.

[0020] In this invention, the "R" 50 "R" refers to the resistance value at 50℃. 80"R" refers to the resistance value at 80℃. 20 "" refers to the resistance value at 20℃.

[0021] In some specific embodiments, the thickness of the electric heating plate is 5-20 mm, and the density of the electric heating plate is less than or equal to 1000 kg / m³. 3 This design makes the electric heating panel thin and lightweight, making it ideal for wall heating or ceiling heating renovations.

[0022] In some specific embodiments, the metal plate includes a first layer, a core layer, and a second layer arranged sequentially. The core layer has the porous structure, or the porous structure is formed between the core layer and the first and / or second layers. Preferably, the core layer is a honeycomb core layer or a core layer formed by stamping a metal sheet into a textured structure. The thicknesses of the first and second layers are 0.1~2mm, and the thickness of the core layer is 1~25mm. More preferably, the thickness of the metal plate is 3~15mm, and the pore size of the honeycomb core layer is 2~8mm. Specific thicknesses of the metal plate include 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, etc.

[0023] In some specific embodiments, the conductive shielding layer includes a conductive shielding body layer and a resin layer selectively composited with the conductive shielding body layer, wherein the resin layer is bonded to the heating element.

[0024] The conductive shielding body layer is selected from one or more of aluminum, copper, iron, nickel, zinc, alloys, or graphite, carbon nanotubes, graphene, and carbon black, and the thickness of the conductive shielding layer is 0.5~80μm.

[0025] In some specific embodiments, the bottom layer is made of metal plate, glass plate, stone crystal plate, calcium silicate plate, rock wool plate or ceramic plate, with a thickness of 0.2~5mm.

[0026] In some specific embodiments, the insulation layer is a polyurethane insulation board, XPS insulation board, CR foam, XPE insulation cotton, nanoporous membrane, vacuum insulation board or aerogel, and the thermal conductivity of the insulation layer is 0.005~0.1W / (m·K).

[0027] In some specific embodiments, the electric heating plate further includes a frame disposed around the periphery of the plate body, the frame being a metal frame.

[0028] The second technical solution adopted by the present invention is: an electric heating board, including a board body, the board body including a bottom layer, a top layer and a heating element disposed between the bottom layer and the top layer, the top layer being a Class A flame retardant material layer and composed of a metal plate or a non-metal plate;

[0029] The non-metallic plate is a glass plate, a stone crystal plate, a calcium silicate plate, a rock wool plate, or a ceramic plate;

[0030] When the surface layer is made of a metal plate, the plate body also includes a conductive shielding layer disposed between the surface layer and the heating element.

[0031] Furthermore, the metal plate is made of aluminum, iron, stainless steel, galvanized steel, copper, nickel, tin, or an alloy.

[0032] According to some embodiments of the present invention, the surface layer has a porous structure inside.

[0033] In some specific embodiments, the thickness of the surface layer is 0.5-30 mm, preferably 2-30 mm, and more preferably 3-15 mm.

[0034] Further, the surface layer includes a first layer, a core layer, and a second layer stacked sequentially, wherein the core layer has the pore structure, or the core layer forms the pore structure with the first layer and / or the second layer; preferably, the thickness of the first layer and the second layer are 0.1~2mm, and the thickness of the core layer is 1~25mm; more preferably, the thickness of the first layer is greater than or equal to 0.5mm and less than or equal to 2mm, the thickness of the second layer is greater than 0.1mm and less than or equal to 2mm, and the thickness of the core layer is greater than or equal to 3mm and less than or equal to 10mm.

[0035] In some specific embodiments, the first layer, the core layer, and the second layer are all made of metal. The core layer is a honeycomb core layer or a core layer formed by stamping a metal sheet into a concave-convex structure. Preferably, the materials of the first layer, the core layer, and the second layer are independently selected from aluminum, iron, stainless steel, and galvanized steel, respectively.

[0036] Specifically, the surface layer is a honeycomb metal plate or a three-dimensional metal plate, such as a honeycomb aluminum plate, a honeycomb iron plate, a honeycomb stainless steel plate, a honeycomb galvanized steel plate, or an aluminum three-dimensional plate.

[0037] In some specific embodiments, the conductive shielding layer includes a conductive shielding body layer and a resin layer selectively composited with the conductive shielding body layer. The conductive shielding body layer is selected from one or more of aluminum, copper, iron, nickel, zinc, alloys, or graphite, carbon nanotubes, graphene, and carbon black. The thickness of the conductive shielding layer is 0.1~100μm. Preferably, the thickness of the conductive shielding layer is 0.5~80μm.

[0038] In some specific embodiments, the conductive shielding layer includes a conductive shielding body layer and a resin layer composite with the conductive shielding body layer. The resin layer is bonded to the heating element, and the resin layer may be, for example, acrylic resin or polyurethane resin.

[0039] For example, the conductive shielding layer can be made of aluminum foil tape.

[0040] In some specific embodiments, the plate body further includes an insulating layer disposed between the surface layer and the conductive shielding layer.

[0041] In some specific embodiments, the insulating layer is independently selected from polyester film, polyimide film, silicone rubber or natural vulcanized / semi-vulcanized rubber film, epoxy board, mica board, tetrafluoroethylene / vinylidene fluoride film, polyethylene film, polypropylene film or polyvinyl chloride film.

[0042] In some specific embodiments, the bonding between the insulating layer and the conductive shielding layer, between the conductive shielding layer and the heating element, and between the insulating layer and the surface layer are respectively selected from one or more of the following four methods: bonding with non-curing adhesives, bonding with thermally conductive materials, bonding with fully cured resins, and physical pressing. Further, the non-curing adhesive is an acrylic resin adhesive, a silicone adhesive, or a polyurethane adhesive; the fully cured resin is a conventional cross-linked resin such as epoxy resin, acrylic resin, polyurethane resin, polyurea resin, fluorocarbon resin, polyester resin, vinyl ester resin, or alkyd resin; and the thermally conductive material is thermally conductive silicone grease.

[0043] In some specific embodiments, the bottom layer is a Class A flame-retardant material layer.

[0044] Preferably, the bottom layer is made of metal plate, glass plate, crystalline silicate plate, calcium silicate plate, rock wool plate, or ceramic plate, with a thickness of 0.1~10mm. This provides excellent flame retardancy and improves the strength of the electric heating plate.

[0045] More preferably, the thickness of the bottom layer is 0.5~5mm. Even more preferably, the thickness of the bottom layer is 0.5~3mm.

[0046] In some specific embodiments, the power density of the heating element is 100 W / m². 2 ~1500W / m 2 The voltage range is 12~380V; the heating element is a constant power heating film, resistance wire, or self-regulating heating element. Preferably, the heating element is a self-regulating heating element.

[0047] Furthermore, the power density is 150 W / m². 2 ~1000W / m 2 Furthermore, the power density is 200 W / m³. 2 ~800W / m 2 .

[0048] Preferably, the self-regulating heating element is a self-regulating heating film or a self-regulating ceramic heating element, and the PTC intensity of the self-regulating heating element is: R 50 (Resistance at 50℃) / R 20 Greater than or equal to 1; more preferably, the PTC intensity is R 50 / R 20 R is greater than or equal to 2.5 80 / R 20 It is greater than or equal to 8.

[0049] Furthermore, the heating element includes a first encapsulation insulating layer, a second encapsulation insulating layer, and a carbon film and a patterned metal electrode layer encapsulated between the first and second encapsulation insulating layers. The metal electrode layer is a patterned aluminum foil, copper foil, nickel-chromium alloy sheet, or stainless steel sheet, prepared by etching, die-cutting, or screen-printed conductive silver or conductive copper electrodes. The carbon film is a conductive film formed directly by CVD deposition of one or more of carbon nanotubes, conductive carbon black, graphene, graphite, or chopped carbon fiber powder; or a conductive film formed by melt blending with polymers and other additives, including phase change materials; or a conductive film formed by dispersing and blending with polymer solutions, phase change materials, leveling agents, defoamers, etc., and then coating or printing and drying; or a conductive film prepared by dispersing with synthetic or natural fibers using a "papermaking" process. Carbon nanotubes are preferred as the carbon film.

[0050] In some specific embodiments, the plate body further includes a heat insulation layer disposed between the heating element and the bottom layer, wherein the thermal conductivity of the heat insulation layer is less than or equal to 0.1 W / (m·K); further, the thermal conductivity is 0.005~0.1 W / (m·K), which can effectively prevent heat loss.

[0051] The insulation layer is a polyurethane insulation board, XPS insulation board, CR foam, XPE insulation cotton, nanoporous membrane, vacuum insulation board, or aerogel.

[0052] In some embodiments, the electric heating plate also includes a plug electrically connected to the heating element.

[0053] In some specific embodiments, the electric heating plate further includes a frame disposed around the periphery of the plate body, the frame being a metal frame or an inorganic non-metallic frame. The frame is made of materials such as aluminum alloy, stainless steel, galvanized steel, copper, iron, nickel, tin, etc. The plate body and the frame are fixed together using screws or clips.

[0054] In some specific embodiments, the metal frame is selected with a thickness of 5~50mm, a width of 5~25mm, and a length of 0.5~3.2m, and a transverse metal strip is added every 100±10cm along the length direction for support.

[0055] In some specific embodiments, the frame is a metal frame, and a grounding post is provided on the frame for reliable grounding. When multiple electric heating panels are installed, at least one electric heating panel has a grounding post on its frame, and the frames of adjacent electric heating panels are connected by a metal sheet to ensure the reliability of the grounding of each electric heating panel.

[0056] In some other embodiments, the bottom layer or the top layer is a metal component, and a grounding post is provided on the inner surface of the bottom layer or the top layer to ensure reliable grounding.

[0057] In some other embodiments, both the bottom layer and the top layer are metal components, and a grounding post is provided on the inner surface of at least one of the bottom layer and the top layer to ensure reliable grounding.

[0058] In some specific embodiments, on one side of the frame, a protrusion is provided and on the other side, a recess is provided. When multiple electric heating panels are installed, the protrusion is inserted into the recess to prevent the frames of two adjacent electric heating panels from separating when thermally expanding and contracting.

[0059] In some embodiments, the surface layer is a metal plate, and one side of the opposite sides of the surface layer has a protrusion and the other side has a recess. When multiple electric heating plates are installed, the protrusion of one of the two adjacent electric heating plates is inserted into the recess of the other electric heating plate.

[0060] In other embodiments, the surface layer is a metal plate, the surface layer includes a surface body and a folded portion integrally formed along the circumference of the surface body on the side edge of the surface body, and a receiving cavity is formed between the surface body and the folded portion.

[0061] In some specific embodiments, the bottom layer, the heating element, and the conductive shielding layer constitute a prefabricated heating element, which is fixed to the surface layer by one or more of the following methods: bonding with non-curing adhesive, bonding with thermally conductive material, bonding with fully cured resin, and physical pressing.

[0062] In some specific embodiments, the heating element and the bottom layer are fixed together by an adhesive, or the heating element and the bottom layer are fixed together by a frame.

[0063] In some specific embodiments, the heat insulation layer is also part of the pre-heated element; the insulating layer is also part of the pre-heated element.

[0064] In some specific embodiments, the thickness of the electric heating plate is 5-20 mm, and the density of the electric heating plate is less than or equal to 1000 kg / m³. 3 .

[0065] The third technical solution adopted by the present invention is: an electric heating system containing the electric heating plate described above.

[0066] The electric heating system includes multiple electric heating panels, a controller, and a conductive component for connecting the electric heating panels and the controller.

[0067] The conductive component includes a connecting wire electrically connected to the controller and multiple interfaces provided on the connecting wire that can mate with the plug of the electric heating plate.

[0068] When in use, connect the power supply and control the heating temperature through the controller to keep the surface temperature between 30 and 60°C to achieve heating.

[0069] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0070] The electric heating board provided by this invention is particularly suitable for wall heating renovation or ceiling heating renovation. It is not only easy to install, but also has excellent flame retardant effect. It is not easy to form hollows or other deformations after long-term use, and it also fundamentally solves the problem of leakage current tripping.

[0071] The electric heating plate provided by this invention not only meets the market demand for electric heating plates with high flame retardant performance, but also does not easily form hollows or other deformations after long-term use, thereby improving the service life, user experience, stability, and reliability of the electric heating plate, and meeting the market demand for efficient, safe, and stable electric heating plates. Attached Figure Description

[0072] Figure 1 is a full sectional view of the electric heating plate of Example 1;

[0073] Figure 2 is a schematic diagram of the heating element of the electric heating plate in Example 1;

[0074] Figure 3 is a schematic diagram of the structure of the electric heating plate installed on the wall in Example 1;

[0075] Figure 4 is a wiring diagram of the electric heating plate in Example 1;

[0076] Figure 5 is a schematic diagram of the connecting lines and interfaces in Figure 4;

[0077] Figure 6 is a schematic diagram of the plug in Figure 4;

[0078] Figure 7 is a rear view of the electric heating plate of Example 1;

[0079] Figure 8 is a schematic diagram of the structure of the electric heating plate installed on the ceiling in Example 1;

[0080] Figure 9 is a full sectional view of the electric heating plate of Example 2;

[0081] Figure 10 is a schematic diagram of the surface layer installation state of the electric heating plate in Example 3;

[0082] Figure 11 is a schematic diagram of the surface layer of the electric heating plate in Example 4;

[0083] Figure 12 is a schematic diagram of the honeycomb panel structure used for the surface layer of the electric heating plate in Example 4;

[0084] Figure 13 is a schematic diagram of the installation structure of the electric heating plate in Example 4;

[0085] In the diagram: 100, electric heating panel; 200, wall; 300, mounting bracket; 400, ceiling;

[0086] 1. Bottom layer; 2. Insulation layer; 3. Heating element; 31. First insulating encapsulation layer; 32. Second insulating encapsulation layer; 33. Carbon film; 34. Electrode; 4. Conductive shielding layer; 5. Frame; 6. Insulation layer; 7. Top layer; 71. Top body; 72. Folding part; 8. Connecting wire; 9. Plug; 10. Terminal; 11. Interface; 12. Protrusion; 13. Recess; 14. Groove; 15. Connector. Detailed Implementation

[0087] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Example 1

[0088] Referring to Figures 1-2, the electric heating plate 100 provided in this embodiment includes a plate body and a frame 5 surrounding the plate body. The plate body includes a bottom layer 1, a heat insulation layer 2, a heating element 3, a conductive shielding layer 4, an insulating layer 6, and a surface layer 7 arranged sequentially.

[0089] The surface layer 7 uses honeycomb aluminum panels, which not only achieve Class A flame retardant performance but also enhance the stability and sound insulation of the heating panel, and solve problems such as hollowing and deformation. This improves the service life of the heating panel and the user experience, meeting the market demand for high-quality, stable, and reliable heating panels.

[0090] If a honeycomb aluminum panel with a thickness of 5mm and a pore size of 5mm is used, specifically if the honeycomb aluminum panel includes a first layer, a honeycomb core layer and a second layer arranged in sequence, the thickness of the first layer is 0.6mm and the thickness of the second layer is 0.4mm, the honeycomb aluminum panel has sufficient strength.

[0091] The bottom layer 1 also uses Class A flame-retardant materials, such as aluminum plates with a thickness of 1mm; the frame 5 uses an aluminum frame, specifically an aluminum frame with a thickness of 15mm, a width of 10mm, a length of 1m, and a height of 2m, and an additional horizontal aluminum strip is added every 100cm along the length direction for support.

[0092] The heating element 3 is placed between the honeycomb aluminum plate and the bottom aluminum plate 1, and is fixed around the perimeter with a metal aluminum frame. This effectively solves the problem that existing electric heating panels cannot achieve Class A flame retardancy, greatly improves the safety of the electric heating panel, and meets the market demand for electric heating panels with high flame retardancy performance.

[0093] Setting a conductive shielding layer 4 between the honeycomb aluminum plate and the heating element 3 can effectively solve the leakage current problem caused by the metal surface layer and prevent the leakage current from being too large and tripping the leakage protection circuit breaker.

[0094] If the conductive shielding layer 4 is made of aluminum foil, the thickness is 0.05 mm; if the insulating layer 6 is made of PET film, adhesives are used to bond the surface layer 7 and the insulating layer 6, the conductive shielding layer 4 and the insulating layer 6, and the conductive shielding layer 4 and the heating element 3. The adhesive can be a non-curing adhesive, such as acrylic resin adhesive, silicone adhesive, or polyurethane adhesive.

[0095] The heating element 3 can be a commercially available planar heating film, such as a constant power heating film or a self-regulating heating film. The self-regulating heating film can avoid localized overheating caused by overheating of the covering, and its PTC strength is: R 50 (Resistance at 50℃) / R 20 Greater than or equal to 1, R 80 / R 20 Greater than or equal to 8.

[0096] Referring to Figure 2, the heating element 3 includes a first insulating encapsulation layer 31, a second insulating encapsulation layer 32, a carbon film 33 encapsulated between the first and second insulating encapsulation layers 31 and 32, and a patterned metal electrode layer 34. The carbon film 33 and the electrode layer 34 are in contact. The electrode layer 34 is formed by etching, die-cutting, or other processes using a metal sheet, such as a copper electrode layer. The carbon film 33 can be one or more of carbon nanotubes, carbon black, graphene, graphite, or chopped carbon fiber powder, dispersed, blended with a film-forming polymer, and then coated or printed. Carbon nanotubes are preferred to ensure the thermal efficiency of the heating element 3.

[0097] The heating power density of the heating element 3 is 200 W / m³. 2 ~800W / m 2 Specifically, such as 450 W / m 2 Or 700 W / m 2 The operating voltage is AC220V, and the heating element 3 has a size of 1m×2m and a thickness of 0.2mm.

[0098] The insulation layer 2 can be made of insulation material with a thermal conductivity of 0.005~0.1W / (m·K). If polyurethane insulation board is used, it also has a B1-level flame retardant effect.

[0099] The electric heating plate also includes a plug 9 that is electrically connected to the heating element 3, which can be referred to as the female end.

[0100] In this example, the thickness of the electric heating plate is 10mm, and its density is 618kg / m³. 3 .

[0101] Referring to Figure 3, the electric heating plate 100 is installed on the wall 200 through the fixing bracket 300 and used as an electric heating wall panel to prepare an electric heating system and realize room heating.

[0102] Referring to Figures 4-6, the electric heating system includes multiple electric heating panels, a controller, and a conductive component for connecting the electric heating panels and the controller. The conductive component includes a connecting wire 8 that is electrically connected to the controller and multiple interfaces 11 (called male terminals) on the connecting wire that can mate with the plugs 9 of the electric heating panels. The setting of male and female terminals can reduce the number of wires between the controller and the electric heating panels.

[0103] In this example, as shown in Figure 7, terminal blocks 10 are respectively provided on the inner surface of the surface layer 7 of multiple electric heating panels. The terminal blocks 10 are studs that extend out of the bottom layer 1. A grounding post is also provided on the frame of the first electric heating panel. The terminal blocks 10 are connected to the grounding wire and the grounding wire is fixed. Specifically, the grounding wire is fixed to the grounding post 10 by using a nut. The frames of multiple electric heating panels are connected by metal sheets. The grounding post 10 is in contact with the wall to provide reliable grounding and meet the requirements of the 3C standard.

[0104] With the electric heating panel set up above, after the power is turned on and the controller is turned on to make the heating element 3 work, the temperature of the honeycomb aluminum panel surface can be maintained at 30~60℃ to achieve room heating.

[0105] As shown in Figure 8, the electric heating panel 100 can also be installed on the ceiling 400 for use as a top heating system. The electric heating panel 100 is installed on the ceiling 400 using a mounting bracket 300. If applied to a room with a suspended ceiling, it can be integrated with the existing ceiling to form a unified whole, without occupying indoor space and improving the utilization rate of indoor space. Furthermore, it is easy to install and can reduce installation costs.

[0106] Whether the electric heating panel is installed on the wall or the ceiling, in actual use, convection modules can be installed on one or more edges of the electric heating panel. The convection modules can be cross-flow fans, and can be arranged in one or multiple pieces. They can make hot air circulate in the room, improve the heating effect, and also increase the function of the heating equipment to meet people's growing needs. Example 2

[0107] Referring to Figure 9, the electric heating plate 100 provided in this embodiment differs from that in embodiment 1 in that: the surface layer 7 is made of calcium silicate board, and the conductive shielding layer 4 and the insulating layer 6 are omitted. Instead, the calcium silicate board is attached to the heating element 3.

[0108] This electric heating board can be widely used in building heating, building materials and electromagnetic shielding. Example 3

[0109] The electric heating plate provided in this embodiment has a structure that is basically the same as that in embodiment 1. The difference is that the bottom layer, the insulation layer, the heating element, the conductive shielding layer and the insulation layer constitute a prefabricated heating element, and the heating element and the insulation layer, as well as the insulation layer and the bottom layer, are fixed together by an adhesive, such as epoxy resin.

[0110] The surface layer 7 is bonded to the pre-fabricated heating element using an adhesive such as epoxy resin.

[0111] Referring to Figure 10, the surface layer 7 is made of honeycomb aluminum panel, and on the opposite sides of the surface layer 7, one side has a protrusion 12 and the other side has a recess 13. When multiple electric heating panels are installed, the protrusion 12 of one of the two adjacent electric heating panels is inserted into the recess 13 of the other electric heating panel. In this way, only the surface layer of the electric heating panel can be seen from the front, and other structures cannot be seen, which is more beautiful and more in line with the aesthetics of modern people.

[0112] The selection of the bottom layer, insulation layer, heating element, conductive shielding layer, and insulating layer in this example can be the same as in Example 1. Example 4

[0113] The electric heating plate provided in this embodiment is basically the same as that in embodiment 3, except that: referring to Figure 11, the surface layer 7 includes a surface body 71 and a folded portion 72 integrally formed along the circumference of the surface body 71 on the side edge of the surface body 71, and a receiving cavity is formed between the surface body 71 and the folded portion 72, and a pre-made heating element is disposed in the receiving cavity.

[0114] The surface layer 7 can be made from a single piece of honeycomb aluminum panel, as shown in Figure 12. For example, grooves 14 can be made at a certain distance from the edge of each side of the honeycomb aluminum panel, and then each side can be folded along the grooves 14 to form a folded part 72.

[0115] When multiple electric heating panels are installed, as shown in Figure 13, the folded portions 72 of the surface layer 7 of two adjacent electric heating panels are fitted together and then connected by connectors 15. For example, a concave fastener is used to fasten them together. In this way, only the surface layer of the electric heating panel can be seen from the front, and other structures cannot be seen, which is more aesthetically pleasing. Example 5

[0116] The electric heating plate provided in this embodiment is basically the same as that in embodiment 4, except that: the surface layer 7 is made of aluminum three-dimensional plate, which includes a first layer, a core layer and a second layer stacked in sequence. The core layer is formed by stamping a metal sheet into a concave-convex structure, and its cross-section is wavy.

[0117] In summary, the embodiments described above have the following advantages:

[0118] 1) By placing the heating element between the metal surface layer and the metal bottom layer, and fixing it with a metal frame around the perimeter, the problem of existing electric heating panels being unable to achieve Class A flame retardancy is effectively solved, the safety performance of the electric heating panels is improved, the market demand for electric heating panels with high flame retardancy is met, and the use of a self-limiting heating element further improves the safe use of the electric heating panels.

[0119] 2) The surface layer uses honeycomb metal panels or three-dimensional metal panels, which effectively avoids hollow areas, improves the product's service life and user experience, and meets the market's demand for high-quality, stable and reliable electric heating panels.

[0120] 3) Adding a conductive shielding layer between the metal surface layer and the heating element effectively solves the problem of excessive leakage current of distributed capacitance tripping the leakage protection circuit breaker, improves the stability and reliability of the electric heating board, and meets the market demand for efficient, safe and stable electric heating boards.

[0121] 4) The electric heating panel can be installed flexibly and is not limited by location. It can be installed on the wall or the ceiling. In addition, the electric heating panel is thin and lightweight, making it easy to install.

[0122] 5) The heating element, insulation layer and bottom layer are fixed to form a prefabricated heating element. The structure of the surface layer is then optimized so that when the electric heating panel is installed, only the surface layer of the electric heating panel can be seen from the front, and other structures cannot be seen. This is more beautiful and more in line with the aesthetics of modern people.

[0123] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0124] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

Claims

1. An electric heating panel, comprising a panel body, characterized in that: The plate body includes a bottom layer, a heat insulation layer, a self-limiting heating element, a conductive shielding layer, an insulating layer, and a top layer arranged in sequence. The top layer is a Class A flame-retardant material layer and is made of a metal plate. The metal plate has a porous structure inside. The bottom layer is a Class A flame-retardant material layer.

2. The electric heating plate according to claim 1, characterized in that: The power density of the self-regulating heating element is 100W / m². 2 ~1500W / m 2 And the PTC intensity of the self-limiting heating element is: R 50 / R 20 Greater than or equal to 1; preferably, the power density of the self-limiting heating element is 200 W / m³. 2 ~800W / m 2 The PTC strength is: R 50 / R 20 ≥2.5; and / or, the self-regulating heating element is a self-regulating heating film or a self-regulating ceramic heating element.

3. The electric heating plate according to claim 1, characterized in that: The thickness of the electric heating plate is 5-20mm, and the density of the electric heating plate is less than or equal to 1000kg / m³. 3 .

4. The electric heating plate according to any one of claims 1 to 3, characterized in that: The metal plate includes a first layer, a core layer, and a second layer arranged sequentially. The core layer has the hole structure, or the hole structure is formed between the core layer and the first layer and / or the second layer. Preferably, the core layer is a honeycomb core layer or a core layer formed by stamping a metal sheet into a concave-convex structure. The thicknesses of the first layer and the second layer are 0.1~2mm, and the thickness of the core layer is 1~25mm. More preferably, the thickness of the metal plate is 3~15mm, and the pore size of the honeycomb core layer is 2~8mm.

5. The electric heating plate according to any one of claims 1 to 3, characterized in that: The conductive shielding layer includes a conductive shielding body layer and a resin layer selectively bonded to the conductive shielding body layer, wherein the resin layer is bonded to the heating element. The conductive shielding body layer is selected from one or more of aluminum, copper, iron, nickel, zinc, alloys, or graphite, carbon nanotubes, graphene, and carbon black, and the thickness of the conductive shielding layer is 3~80μm; and / or, The bottom layer is made of metal plate, glass plate, crystalline silicate plate, calcium silicate plate, rock wool plate, or ceramic plate, with a thickness of 0.5~5mm; and / or, The insulation layer is a polyurethane insulation board, XPS insulation board, CR foam, XPE insulation cotton, nanoporous membrane, vacuum insulation board, or aerogel, and the thermal conductivity of the insulation layer is 0.005~0.1 W / (m·K); and / or, The electric heating panel also includes a frame disposed around the periphery of the panel body, the frame being a metal frame.

6. An electric heating panel, comprising a panel body, the panel body comprising a bottom layer, a top layer, and a heating element disposed between the bottom layer and the top layer, characterized in that: The surface layer is a Class A flame-retardant material layer and is composed of a metal plate or a non-metal plate; The non-metallic plate is a glass plate, a stone crystal plate, a calcium silicate plate, a rock wool plate, or a ceramic plate; When the surface layer is made of a metal plate, the plate body also includes a conductive shielding layer disposed between the surface layer and the heating element.

7. The electric heating plate according to claim 6, characterized in that: The surface layer has a porous structure; and / or the thickness of the surface layer is 0.5~30mm; and / or the heating element is a self-regulating heating element.

8. The electric heating plate according to claim 7, characterized in that: The thickness of the surface layer is 2~30mm; The surface layer comprises a first layer, a core layer, and a second layer stacked sequentially. The core layer has the pore structure, or the pore structure is formed between the core layer and the first layer and / or the second layer. Preferably, the thickness of the first layer and the second layer is 0.1~2mm, and the thickness of the core layer is 1~25mm. More preferably, the thickness of the first layer is greater than or equal to 0.5mm and less than or equal to 2mm, the thickness of the second layer is greater than 0.1mm and less than or equal to 2mm, and the thickness of the core layer is greater than or equal to 3mm and less than or equal to 10mm.

9. The electric heating plate according to claim 8, characterized in that: The first layer, the core layer, and the second layer are all made of metal. The core layer is a honeycomb core layer or a core layer formed by stamping a metal sheet into a concave-convex structure. Preferably, the materials of the first layer, the core layer, and the second layer are independently selected from aluminum, iron, stainless steel, and galvanized steel, respectively.

10. The electric heating plate according to claim 6, characterized in that: The conductive shielding layer includes a conductive shielding body layer and a resin layer selectively bonded to the conductive shielding body layer, wherein the resin layer is bonded to the heating element. The conductive shielding body layer is selected from one or more of aluminum, copper, iron, nickel, zinc, alloys, or graphite, carbon nanotubes, graphene, and carbon black, and the thickness of the conductive shielding layer is 0.1~100um. The resin layer is made of acrylic resin or polyurethane resin.

11. The electric heating plate according to claim 10, characterized in that: The plate body further includes an insulating layer disposed between the surface layer and the conductive shielding layer; preferably, the insulating layer is independently selected from polyester film, polyimide film, silicone rubber film, natural vulcanized rubber film, semi-vulcanized rubber film, epoxy board, mica board, tetrafluoroethylene film, vinylidene fluoride film, polyethylene film, polypropylene film or polyvinyl chloride film.

12. The electric heating plate according to claim 11, characterized in that: The insulating layer and the conductive shielding layer, the conductive shielding layer and the heating element, and the insulating layer and the surface layer are fixed by one or more of the following four methods: non-curing adhesive bonding, thermally conductive material bonding, fully cured resin bonding, and physical pressing.

13. The electric heating plate according to claim 6, characterized in that: The bottom layer is a Class A flame-retardant material layer, which may be made of metal plate, glass plate, crystalline silicate plate, calcium silicate board, rock wool board, or ceramic plate, with a thickness of 0.1~10mm; and / or, The power density of the heating element is 100 W / m² 2 ~1500W / m 2 Voltage range 12~380V; and / or, The heating element is a constant power heating film, a resistance wire, a self-regulating heating film, or a self-regulating ceramic heating element; preferably, the heating element is a self-regulating heating film or a self-regulating ceramic heating element, and the PTC intensity of the self-regulating heating element is R. 50 / R 20 Greater than or equal to 1; and / or, The plate body further includes a thermal insulation layer disposed between the heating element and the bottom layer, the thermal conductivity of the thermal insulation layer being less than or equal to 0.1 W / (m·K); the thermal insulation layer is a polyurethane insulation board, XPS insulation board, CR foam, XPE insulation cotton, nanoporous membrane, vacuum insulation board, or aerogel; and / or, The electric heating panel further includes a frame disposed around the periphery of the panel body, the frame being a metal frame or an inorganic non-metallic frame; and / or, The electric heating plate also includes a plug electrically connected to the heating element; and / or, The thickness of the electric heating plate is 5-20mm, and the density of the electric heating plate is less than or equal to 1000kg / m³. 3 .

14. The electric heating plate according to claim 6, characterized in that: The electric heating board also includes a frame disposed around the board body. The frame is a metal frame, and a grounding post is disposed on the frame for reliable grounding.

15. The electric heating plate according to claim 6, characterized in that: The bottom layer or top layer is a metal component, and a grounding post is provided on the inner surface of the bottom layer or top layer for reliable grounding; Alternatively, both the bottom layer and the top layer are metal components, and a grounding post is provided on the inner surface of at least one of the bottom layer and the top layer to ensure reliable grounding.

16. The electric heating plate according to claim 6, characterized in that: The surface layer is a metal plate. On one side of the opposite sides of the surface layer, there is a protrusion and a recess. When multiple electric heating plates are installed, the protrusion of one of the two adjacent electric heating plates is inserted into the recess of the other electric heating plate.

17. The electric heating plate according to claim 6, characterized in that: The surface layer is a metal plate, and the surface layer includes a surface body and a folded portion integrally formed along the circumference of the surface body on the side edge of the surface body, and a receiving cavity is formed between the surface body and the folded portion.

18. The electric heating plate according to claim 16 or 17, characterized in that: The bottom layer, the heating element, and the conductive shielding layer are fixed together to form a prefabricated heating element. The prefabricated heating element is fixed to the surface layer by one or more of the following methods: non-curing adhesive bonding, thermally conductive material bonding, fully cured resin bonding, and physical pressing.

19. The electric heating plate according to claim 18, characterized in that: The heating element and the bottom layer, and the heating element and the conductive shielding layer, are respectively fixed together with adhesives, or the bottom layer, the heating element, and the conductive shielding layer are fixed together with a frame; and / or, The electric heating panel further includes a heat insulation layer disposed between the heating element and the bottom layer, the heat insulation layer also being part of the prefabricated heating element; and / or The electric heating plate also includes an insulating layer that is bonded to the conductive shielding layer, and the insulating layer is located between the conductive shielding layer and the surface layer, and the insulating layer is also part of the prefabricated heating element.

20. The use of an electric heating panel according to any one of claims 1 to 19 in wall heating renovation or ceiling heating renovation.

21. An electric heating system, characterized in that: The electric heating plate comprising any one of claims 1 to 20.

22. The electric heating system according to claim 21, characterized in that: The electric heating system includes multiple electric heating panels, a controller, and a conductive component for connecting the electric heating panels and the controller.

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