Electric heating film

Abstract

The utility model relates to the field of electric heating films, and discloses an electric heating film which comprises an electric heating film body, the electric heating film body is composed of two polyimide films, a black film body, a plurality of heating bodies, a plurality of connecting wires and a wire group, the black film body is fixed on the bottom surface of the polyimide film on the black film body, and the heating bodies are fixed on the bottom surface of the polyimide film on the black film body. The plurality of heating bodies are fixed between the two polyimide films, the top surfaces of the heating bodies are adhered to the bottom surface of the black film body, the plurality of heating bodies are electrically connected, the connecting wire is electrically connected between the plurality of heating bodies, and the lead group is electrically connected to the heating bodies. According to the utility model, the self-temperature-limiting characteristic of the electric heating film body enables the electric heating film body to automatically adjust the power according to the temperature of the electric heating film body, when the temperature of the electric heating film rises to a certain degree, the resistance of the electric heating film is increased along with the rising of the temperature, and the power is reduced when the resistance is increased, thereby reducing the heating amount; and overheating caused by continuous infinite temperature rise is prevented.

Description

Technical Field

[0001] This utility model relates to the technical field of electric heating films, specifically an electric heating film. Background Technology

[0002] With the continuous advancement of materials science, novel conductive materials have been developed and applied to electric heating films. For example, materials such as carbon nanotubes and graphene possess excellent electrical conductivity and thermal stability. These materials can generate high amounts of heat at relatively low voltages and maintain stable performance during prolonged heating, without rapidly aging or degrading due to rising temperatures.

[0003] Chinese Patent No. CN219802610U discloses an electric heating film comprising a lower insulating layer, an upper insulating layer, a heating wire located between the lower and upper insulating layers, a frame located at the edge of the lower insulating layer, and a slot with an upward opening on the upper side of the frame. The lower edge of the upper insulating layer is provided with a plate that engages with the slot. Multiple first limiting blocks and multiple second limiting blocks are located on the lower side of the upper insulating layer, and adjacent first limiting blocks and second limiting blocks fix the heating wire between the lower and upper insulating layers.

[0004] In the above scheme, multiple first and second limiting blocks can fix the heating wire between the lower and upper insulating layers, preventing the adjacent heating wires from shifting due to heating. However, it has the following disadvantages: the heating wire of this electric heating film cannot flexibly adjust its temperature according to its own temperature, which makes the surface temperature of the electric heating film prone to being too high or too low, thereby reducing the effectiveness of the electric heating film. Utility Model Content

[0005] The purpose of this invention is to provide an electric heating film that solves the problem that the heating wire of the electric heating film cannot flexibly adjust its temperature according to its own temperature, resulting in the surface temperature of the electric heating film being too high or too low.

[0006] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: an electric heating film, comprising an electric heating film body, wherein the electric heating film body is composed of two polyimide films, a black film body, a plurality of heating elements, a plurality of connecting wires, and a wire assembly. The black film body is fixed to the bottom surface of the upper polyimide film, the plurality of heating elements are all fixed between the two polyimide films, the top surface of the heating element is adhered to the bottom surface of the black film body, the plurality of heating elements are electrically connected to each other, the connecting wires are electrically connected between the plurality of heating elements, and the wire assembly is electrically connected to the heating elements. Stable temperature control also helps to improve the stability of the entire heating system and reduce the adverse effects on other related equipment or the environment caused by temperature fluctuations.

[0007] Preferably, the outer wall of the conductor assembly is fixed with a protective sleeve. The protective sleeve can protect the conductor assembly from damage by external mechanical forces. During the installation and use of the electric heating film body, the conductor assembly may be subjected to mechanical forces such as pulling, squeezing, and friction. The protective sleeve can act as a buffer layer to absorb these mechanical forces and prevent the insulation layer of the conductor assembly from being scratched, worn, or the conductor assembly from being broken.

[0008] Preferably, a silicone block is pressed onto the right side of the polyimide film, and the protective sleeve penetrates the silicone block. During the use of the electric heating film body, vibration or external impact may occur. As an elastic material, the silicone block can play a buffering and shock-absorbing role at the connection. It can absorb and disperse these vibration and impact energies, preventing the wire group at the connection from loosening or breaking due to vibration, thereby ensuring the stability and electrical performance of the connection.

[0009] Preferably, the heating element is composed of electrodes and a heating black film (hybrid material). The heating element can change the intermolecular gaps as the temperature changes, thereby changing the resistance and achieving the purpose of self-limiting temperature.

[0010] Preferably, the insulation resistance of the electric heating film body is above 500 MΩ-km.

[0011] Preferably, the allowable heat resistance temperature of the electric heating film body is: a maximum of 65°C and a maximum surface temperature of 85°C. The self-limiting temperature can prevent the electric heating film body from becoming too hot or too cold, and can keep the temperature within a certain range, thus avoiding these safety risks.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] First, the self-limiting temperature characteristic of the electric heating film allows it to automatically adjust its power according to its own temperature. When the temperature of the electric heating film rises to a certain level, its resistance will increase with the increase in temperature. According to the power formula P = U² / R (where P is power, U is voltage, and R is resistance), the power will decrease when the resistance increases, thereby reducing heat generation and preventing the temperature from continuing to rise indefinitely and causing overheating. At the same time, since the self-limiting temperature electric heating film can automatically adjust its power according to the temperature, it will reduce the power when the set temperature is reached, reducing unnecessary energy consumption. In actual use, the ambient temperature is constantly changing. The self-limiting temperature function allows the heating power of the electric heating film to dynamically adapt to the changes in ambient temperature, without having to continuously heat at maximum power, thereby saving energy.

[0014] Second, the protective sleeve isolates the conductor assembly from the external environment, preventing short circuits caused by contact with other conductive objects. In the operating environment of the electric heating film, various metal components or other conductive materials may exist. If the conductor assembly is directly exposed, it is easily exposed to these substances, which can disrupt the normal operation of the circuit, leading to equipment malfunctions or even safety accidents such as electric shock and fire. Silicone blocks fill the gaps at the conductor connections, preventing moisture from entering. Water is a good conductor; if it enters the connection, it may cause a short circuit and corrosion of metal components. Silicone blocks have excellent sealing properties and can effectively block moisture intrusion. The self-regulating temperature of the electric heating film helps reduce thermal stress caused by temperature changes in the film and its related components. When the temperature fluctuates frequently and significantly, the material expands and contracts continuously, leading to internal stress. Over time, this can cause fatigue and damage. Maintaining the temperature within a certain range reduces this thermal stress, thereby extending the service life of the electric heating film and related equipment. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the utility model;

[0016] Figure 2 This is an exploded schematic diagram of a utility model.

[0017] Figure 3 This is a top view schematic diagram of the utility model.

[0018] In the diagram: 1. Electric heating film body; 101. Polyimide film; 102. Black film body; 103. Heating element; 104. Connecting wire; 105. Wire assembly; 2. Protective sleeve; 3. Silicone block. Detailed Implementation

[0019] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] like Figures 1-3 As shown, an electric heating film includes an electric heating film body 1, characterized in that the electric heating film body 1 is composed of two polyimide films 101, a black film body 102, a plurality of heating elements 103, a plurality of connecting wires 104, and a wire assembly 105. The black film body 102 is fixed to the bottom surface of the upper polyimide film 101, the plurality of heating elements 103 are all fixed between the two polyimide films 101, the top surface of the heating elements 103 is adhered to the bottom surface of the black film body 102, the plurality of heating elements 103 are electrically connected to each other, the connecting wires 104 are electrically connected between the plurality of heating elements 103, and the wire assembly 105 is electrically connected to the heating elements 103. The wire assembly 105 is a two-core high-temperature resistant power wire.

[0021] During use, the self-regulating temperature characteristic of the electric heating film body 1 allows it to automatically adjust its power according to its own temperature. When the temperature of the electric heating film rises to a certain level, its resistance increases with the temperature. According to the power formula P = U² / R (where P is power, U is voltage, and R is resistance), the power decreases when the resistance increases, thereby reducing heat generation and preventing the temperature from continuing to rise indefinitely and causing overheating. Simultaneously, because the self-regulating temperature electric heating film body 1 can automatically adjust its power according to the temperature, it will reduce the power after reaching the set temperature, reducing unnecessary energy consumption. In actual use, the ambient temperature is constantly changing; the self-regulating temperature function allows the heating power of the electric heating film body 1 to dynamically adapt to changes in the ambient temperature, eliminating the need for continuous maximum power heating, thus saving energy. Stable temperature control also helps improve the stability of the entire heating system, reducing the adverse effects of temperature fluctuations on other related equipment or the environment.

[0022] like Figures 1-3 As shown, a protective sleeve 2 is fixed to the outer wall of the conductor assembly 105, and a silicone block 3 is pressed onto the right side of the polyimide film 101, with the protective sleeve 2 penetrating the silicone block 3.

[0023] During use, the protective sleeve 2 isolates the wire assembly 105 from the external environment, preventing short circuits caused by contact with other conductive objects. In the environment where the electric heating film body 1 is used, there may be various metal parts or other conductive materials. If the wire assembly 105 is directly exposed, it is easy to come into contact with these materials. Once contact occurs, it will disrupt the normal operation of the circuit, leading to equipment failure or even safety accidents such as electric shock or fire. At the same time, the protective sleeve 2 can protect the wire assembly 105 from damage by external mechanical forces. During the installation and use of the electric heating film body 1, the wire assembly 105 may be subjected to mechanical forces such as pulling, squeezing, and friction. The protective sleeve 2 can act as a buffer layer to absorb these mechanical forces and prevent the insulation layer of the wire assembly 105 from being scratched, worn, or the wire assembly 105 from being broken. The silicone block 3 can fill the gaps at the connection of the wire assembly 105 to prevent moisture from entering the connection. Water is a good conductor of electricity, and if it enters the connection, it may cause a short circuit and corrosion of the metal parts. The silicone block 3 has good sealing performance and can effectively block the intrusion of moisture. At the same time, during the use of the electric heating film body 1, vibration or external impact may occur. As an elastic material, the silicone block 3 can play a role in buffering and shock absorption at the connection. It can absorb and disperse these vibration and impact energies, preventing the wire assembly 105 at the connection from loosening or breaking due to vibration, thereby ensuring the stability and electrical performance of the connection.

[0024] like Figures 1-3As shown, the heating element 103 is composed of electrodes and a heating black film (mixed material). The insulation resistance of the electric heating film body 1 is above 500 MΩ-km. The allowable heat resistance temperature of the electric heating film body 1 is: a maximum maintenance temperature of 65°C and a maximum surface temperature of 85°C.

[0025] During use, the heating element 103 can change the intermolecular gaps with temperature changes, thereby altering the resistance and achieving self-regulating temperature control. The self-regulating temperature control of the electric heating film body 1 helps reduce thermal stress caused by temperature changes in the electric heating film body 1 and its related components. When the temperature fluctuates frequently and significantly, the material will continuously expand and contract, leading to internal stress. Over time, this can cause fatigue and damage to the material. Maintaining the temperature within a certain range reduces this thermal stress, thus extending the service life of the electric heating film body 1 and its related equipment. Simultaneously, self-regulating temperature control prevents the electric heating film body 1 from becoming too hot or too cold, keeping the temperature within a certain range and avoiding these safety risks.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An electric heating film, comprising an electric heating film body (1), characterized in that, The electric heating film body (1) is composed of two polyimide films (101), a black film body (102), several heating elements (103), several connecting wires (104), and a wire group (105). The black film body (102) is fixed on the bottom surface of the upper polyimide film (101). Several heating elements (103) are fixed between the two polyimide films (101). The top surface of the heating element (103) is bonded to the bottom surface of the black film body (102). Several heating elements (103) are electrically connected to each other. The connecting wires (104) are electrically connected between several heating elements (103). The wire group (105) is electrically connected to the heating elements (103).

2. The electric heating film according to claim 1, characterized in that: The outer wall of the conductor assembly (105) is fixed with a protective sleeve (2).

3. The electric heating film according to claim 2, characterized in that: A silicone block (3) is fixed to the right side of the polyimide film (101), and the protective sleeve (2) penetrates the silicone block (3).

4. The electric heating film according to claim 1, characterized in that: The heating element (103) consists of electrodes and a heating black film.

5. The electric heating film according to claim 1, characterized in that: The insulation resistance of the electric heating film body (1) is above 500 MΩ-km.

6. The electric heating film according to claim 5, characterized in that: The allowable heat resistance temperature of the electric heating film body (1) is: a maximum of 65 ºC and a maximum surface temperature of 85 ºC.

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