Electric heater
By setting insulating layers and reinforcing layers on the upper and lower sides of the electric heating alloy layer and using a combination of polyimide and acrylic film layers, the temperature resistance and pressure resistance problems of the electric heater in ultra-low temperature environments are solved, and the insulation and corrosion resistance of the electric heater are improved.
Patent Information
- Application Number
- CN202422739830.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-11-11
AI Technical Summary
Existing electric heaters have poor temperature resistance and pressure resistance in ultra-low temperature environments, and are prone to local burning or breakdown due to insulation layer failure.
An upper insulating layer and a lower insulating layer are arranged on the upper and lower sides of the electric heating alloy layer, and an upper reinforcement layer is laid on the upper insulating layer and a lower reinforcement layer is laid under the lower insulating layer. The reinforcement layer is composed of a polyimide material and a multi-layer acrylic film layer. The polyimide material has insulating, corrosion-resistant and antioxidant properties. The acrylic film layer is elastic and fills the cable protrusions to maintain the insulation performance.
The pressure resistance and temperature resistance of the electric heater are improved, the heat influence at the connection between the cable and the electric heating alloy layer is avoided, and normal operation is ensured in ultra-low temperature environment.
Smart Images
Figure CN223348809U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electric heaters, in particular to an electric heater. Background Art
[0002] Electric heaters are often used in the temperature control and heating systems of medical equipment. The heat resistance of electric heaters directly determines whether the temperature control and heating systems of medical equipment can operate normally in special environments, such as liquid helium ultra-low temperature environments. The insulation capacity of electric heaters under transient high voltage directly affects their temperature rise rate under operating conditions. The higher the upper power density limit that the electric heater can withstand, the faster the temperature rises. The electric heating alloy layer on existing electric heaters is connected to the external power supply through a cable. An insulating layer is provided on the outside of the electric heating alloy layer. When the cable is energized at high voltage, the heat affects the dielectric strength of the insulating layer, resulting in poor voltage resistance and a slow temperature rise rate. Due to material and structural limitations, existing electric heaters have poor heat resistance and cannot operate in ultra-low temperature environments. When the electric heater is energized in ultra-low temperature and high pressure environments, defects such as failure of the surface insulation layer and insufficient insulation strength at the connection between the cable and the electric heating alloy layer may cause partial burning or breakdown of the electric heater. Utility Model Content
[0003] The problem to be solved by the utility model is how to improve the temperature resistance and pressure resistance of the electric heater.
[0004] To this end, the utility model provides an electric heater, including an upper reinforcement layer, an upper insulating layer, a cable, an electric heating alloy layer, a lower insulating layer and a lower reinforcement layer, the upper insulating layer and the lower insulating layer are respectively covered on the upper and lower sides of the electric heating alloy layer and wrap the electric heating alloy layer, one end of the cable is inserted between the upper insulating layer and the electric heating alloy layer and is electrically connected to the electric heating alloy layer, the upper reinforcement layer is covered on the upper surface of the upper insulating layer, and the lower reinforcement layer is covered on the lower surface of the lower insulating layer, the upper reinforcement layer includes a first polyimide layer and a multi-layer acrylic film layer stacked in sequence, the first polyimide layer is located on the side away from the upper insulating layer, the multi-layer acrylic film layer is located on the side close to the upper insulating layer, and the lower reinforcement layer is made of the first polyimide.
[0005] Optionally, the upper insulating layer is made of a second polyimide.
[0006] Optionally, the lower insulating layer is made of a second polyimide.
[0007] Optionally, the high temperature resistance of the first polyimide is weaker than that of the second polyimide.
[0008] Optionally, the cable is a Teflon cable.
[0009] Optionally, the multi-layer acrylic film layer is twenty-eight to thirty-two layers.
[0010] Optionally, the cable is connected to the electrothermal alloy layer by resistance welding.
[0011] Optionally, the positions of the upper reinforcement layer and the lower reinforcement layer only correspond to the connection positions of the cable and the electrothermal alloy layer.
[0012] Optionally, the first polyimide layer and the multi-layer acrylic film layer are connected by hot pressing.
[0013] Optionally, the upper reinforcement layer, the upper insulation layer, the electrothermal alloy layer, the lower insulation layer and the lower reinforcement layer are connected in sequence by hot pressing.
[0014] Compared with the prior art, the electric heater of the present invention has the following advantages:
[0015] The utility model arranges an upper insulating layer and a lower insulating layer on the upper and lower sides of the electric heating alloy layer respectively, and the upper insulating layer and the lower insulating layer can wrap the electric heating alloy layer in the middle to provide insulation for the electric heating alloy layer, and lays an upper reinforcing layer on the upper insulating layer, and lays a lower reinforcing layer on the lower surface of the lower insulating layer to enhance the material thickness on the upper and lower surfaces of the electric heating alloy layer, and the upper reinforcing layer and the lower reinforcing layer both contain a first polyimide material, which has insulation, corrosion resistance, and oxidation resistance, and can improve the insulation withstand voltage strength of the upper and lower surface materials of the electric heating alloy layer, improve the withstand voltage performance of the electric heater, and avoid the influence of heat generated at the connection between the cable and the electric heating alloy layer on the electric heater, and the upper reinforcing layer also contains The multi-layer acrylic film layer is located below the first polyimide layer formed by the first polyimide, and the multi-layer acrylic film layer is connected to the upper insulating layer. Since the cable is connected to the electric heating alloy layer and is located between the electric heating alloy layer and the upper insulating layer, the cable will cause the upper insulating layer to bulge. The change in the shape of the upper insulating layer will affect the insulation performance. A multi-layer acrylic film is arranged between the upper insulating layer and the first polyimide layer. The acrylic film is elastic and can fill the bulge caused by the cable to prevent the first polyimide layer from being deformed, thereby avoiding affecting the insulation performance of the first polyimide layer. In addition, both polyimide and acrylic acid can be used in ultra-low temperature environments, thereby improving the temperature resistance of the electric heater. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is one of the structural diagrams of the electric heater according to an embodiment of the present utility model;
[0017] Figure 2 This is the second structural diagram of the electric heater according to the embodiment of the present utility model;
[0018] Figure 3 This is a structural schematic diagram of the upper reinforcement layer described in an embodiment of the present utility model.
[0019] Description of reference numerals:
[0020] 1-upper reinforcing layer; 11-first polyimide layer; 12-acrylic film layer; 2-upper insulating layer; 3-cable; 4-electric heating alloy layer; 5-lower insulating layer; 6-lower reinforcing layer. DETAILED DESCRIPTION
[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0022] It should be noted that in the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “top”, “bottom”, “front”, “back”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as limiting the scope of protection of the present invention.
[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.
[0024] Furthermore, although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It should be understood that numerous modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described herein may be combined in ways not described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other embodiments.
[0025] To solve the above problems, Figures 1 to 3As shown, the utility model provides an electric heater, comprising an upper reinforcing layer 1, an upper insulating layer 2, a cable 3, an electric heating alloy layer 4, a lower insulating layer 5 and a lower reinforcing layer 6, wherein the upper insulating layer 2 and the lower insulating layer 5 are respectively covered on the upper and lower sides of the electric heating alloy layer 4 and wrap the electric heating alloy layer 4, one end of the cable 3 is inserted between the upper insulating layer 2 and the electric heating alloy layer 4 and is electrically connected to the electric heating alloy layer 4, the upper reinforcing layer 1 is covered on the upper surface of the upper insulating layer 2, and the lower reinforcing layer 6 is covered on the lower surface of the lower insulating layer 5, the upper reinforcing layer 1 comprises a first polyimide layer 11 and a multilayer acrylic film layer 12 stacked in sequence, the first polyimide layer 11 is located on the side away from the upper insulating layer 2, and the multilayer acrylic film layer 12 is located on the side close to the upper insulating layer 2, and the lower reinforcing layer 6 is made of a first polyimide.
[0026] In this embodiment, an upper insulating layer 2 and a lower insulating layer 5 are respectively provided on the upper and lower sides of the electric heating alloy layer 4, and the upper insulating layer 2 and the lower insulating layer 5 can wrap the electric heating alloy layer 4 in the middle to provide insulation for the electric heating alloy layer 4, and an upper reinforcing layer 1 is laid on the upper insulating layer 2, and a lower reinforcing layer 6 is laid on the lower surface of the lower insulating layer 5 to enhance the material thickness on the upper and lower surfaces of the electric heating alloy layer 4, and the upper reinforcing layer 1 and the lower reinforcing layer 6 both contain a first polyimide material, which has insulation, corrosion resistance, and oxidation resistance. It can improve the insulation withstand voltage strength of the upper and lower surface materials of the electric heating alloy layer 4, improve the withstand voltage performance of the electric heater, and avoid the influence of heat generated at the connection between the cable 3 and the electric heating alloy layer 4 on the electric heater. The upper reinforcing layer 1 also includes It includes a multi-layer acrylic film layer 12, which is located below the first polyimide layer 11 formed by the first polyimide. The multi-layer acrylic film layer is connected to the upper insulating layer 2. Since the cable 3 is connected to the electric heating alloy layer 4 and is located between the electric heating alloy layer 4 and the upper insulating layer 2, the cable 3 will cause the upper insulating layer 2 to bulge. The change in the shape of the upper insulating layer 2 will affect the insulation performance. A multi-layer acrylic film is arranged between the upper insulating layer 2 and the first polyimide layer 11. The acrylic film is elastic and can fill the bulge caused by the cable 3 to prevent the first polyimide layer 11 from being deformed, thereby avoiding affecting the insulation performance of the first polyimide layer 11. Both polyimide and acrylic acid can be used in ultra-low temperature environments, thereby improving the temperature resistance of the electric heater.
[0027] Optionally, the upper insulating layer 2 is made of a second polyimide.
[0028] In this embodiment, the upper insulating layer 2 is made of a second polyimide material, which has insulation, voltage resistance, temperature resistance, corrosion resistance, and oxidation resistance, thereby ensuring that the electrothermal alloy layer 4 is in electrical insulation and protecting the electrothermal alloy layer 4.
[0029] Optionally, the lower insulating layer 5 is made of a second polyimide.
[0030] In this embodiment, the lower insulating layer 5 is made of a second polyimide material, which has insulation, voltage resistance, temperature resistance, corrosion resistance, and oxidation resistance, which can ensure that the electric heating alloy layer 4 is in electrical insulation and protect the electric heating alloy layer 4.
[0031] Optionally, the high temperature resistance of the first polyimide is weaker than that of the second polyimide.
[0032] In this embodiment, polyimide can be made of different materials and in different ways. Different polyimides have different properties. The high-temperature resistance of the first polyimide is weaker than that of the second polyimide. For example, the first polyimide used to make the reinforcement layer can withstand an upper high temperature of 150 degrees, and the second polyimide used to make the insulation layer can withstand an upper high temperature of 250 degrees. This arrangement can make the upper insulation layer 2 and the lower insulation layer 5 close to the electric heating alloy layer 4 have better heat resistance, and the upper reinforcement layer 1 and the lower reinforcement layer 6 away from the electric heating alloy layer 4 have inferior heat resistance. The overall structure is more reasonable and avoids waste of resources.
[0033] Optionally, the cable 3 is a Teflon cable.
[0034] In this embodiment, the cable 3 is set as a Teflon cable. Teflon, namely polytetrafluoroethylene, has a high temperature resistance property and is not affected by the heat generated by the cable 3.
[0035] Optionally, the multi-layer acrylic film layer 12 has twenty-eight to thirty-two layers.
[0036] In this embodiment, by setting the number of layers of the multi-layer acrylic film 12 to twenty-eight to thirty-two layers, and most preferably thirty layers, the bulge caused by the cable 3 on the upper insulating layer 2 can be completely filled, avoiding the bulge on the surface of the upper reinforcement layer 1 caused by the cable 3. At the same time, the electric heater will not be too thick, affecting normal use.
[0037] Optionally, the cable 3 and the electrothermal alloy layer 4 are connected by resistance welding.
[0038] In this embodiment, the cable 3 and the electrothermal alloy layer 4 are connected by resistance welding. Resistance welding utilizes the resistance heat generated by the current as a heat source to locally heat the cable 3 and the electrothermal alloy, while simultaneously applying pressure to weld. No filler metal is required, and deformation of the weld is minimal, making it suitable for use in electric heaters.
[0039] Alternatively, as Figure 2 As shown, the positions of the upper reinforcement layer 1 and the lower reinforcement layer 6 only correspond to the connection positions of the cable 3 and the electrothermal alloy layer 4 .
[0040] In this embodiment, by setting the area of the upper reinforcement layer 1 and the lower reinforcement layer 6 to only cover the connection between the electric heating alloy layer 4 and the cable 3, it can not only play the role of reinforcement and improve the pressure resistance of the electric heater, but also save materials and avoid waste.
[0041] Optionally, the first polyimide layer 11 and the multi-layer acrylic film layer 12 are connected by hot pressing.
[0042] In this embodiment, the first polyimide layer 11 is connected to the multi-layer acrylic film layer 12 by heat pressing. The heat pressing connection relies on the adsorption force and chemical reaction between molecules to connect the materials, which is stable and firm, and does not require the use of any harmful gases and electromagnetic equipment during the connection process.
[0043] Optionally, the upper reinforcement layer 1 , the upper insulation layer 2 , the electrothermal alloy layer 4 , the lower insulation layer 5 and the lower reinforcement layer 6 are connected in sequence by hot pressing.
[0044] In this embodiment, the upper reinforcement layer 1, the upper insulating layer 2, the electrothermal alloy layer 4, the lower insulating layer 5 and the lower reinforcement layer 6 are connected in sequence by hot pressing. The hot pressing connection relies on the adsorption force and chemical reaction between molecules to connect the materials, which is stable and firm. In addition, no harmful gases or electromagnetic equipment are required during the connection process, which reduces the impact on the electrothermal alloy layer 4.
[0045] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.
Claims
1. An electric heater, characterized in that: The invention comprises an upper reinforcing layer (1), an upper insulating layer (2), a cable (3), an electrothermal alloy layer (4), a lower insulating layer (5) and a lower reinforcing layer (6), wherein the upper insulating layer (2) and the lower insulating layer (5) are respectively covered on the upper and lower sides of the electrothermal alloy layer (4) and wrap the electrothermal alloy layer (4), one end of the cable (3) is inserted between the upper insulating layer (2) and the electrothermal alloy layer (4) and is electrically connected to the electrothermal alloy layer (4), and the upper reinforcing layer (1) is covered on the lower insulating layer (2) and the lower insulating layer (5). The lower reinforcing layer (6) is covered on the upper surface of the upper insulating layer (2) and on the lower surface of the lower insulating layer (5); the upper reinforcing layer (1) comprises a first polyimide layer (11) and a multilayer acrylic film layer (12) stacked in sequence; the first polyimide layer (11) is located on a side away from the upper insulating layer (2); the multilayer acrylic film layer (12) is located on a side close to the upper insulating layer (2); and the lower reinforcing layer (6) is made of the first polyimide.
2. The electric heater according to claim 1, characterized in that The upper insulating layer (2) is made of a second polyimide.
3. The electric heater according to claim 1, characterized in that The lower insulating layer (5) is made of a second polyimide.
4. The electric heater according to claim 2, characterized in that The high temperature resistance of the first polyimide is weaker than that of the second polyimide.
5. The electric heater according to claim 1, characterized in that The cable (3) is a Teflon cable.
6. The electric heater according to claim 1, characterized in that The multi-layer acrylic film layer (12) has twenty-eight to thirty-two layers.
7. The electric heater according to claim 1, characterized in that The cable (3) and the electrothermal alloy layer (4) are connected by resistance welding.
8. The electric heater according to claim 1, characterized in that The positions of the upper reinforcing layer (1) and the lower reinforcing layer (6) only correspond to the connection positions of the cable (3) and the electrothermal alloy layer (4).
9. The electric heater according to claim 1, characterized in that The first polyimide layer (11) and the multi-layer acrylic film layer (12) are connected by hot pressing.
10. The electric heater according to claim 1, characterized in that The upper reinforcement layer (1), the upper insulation layer (2), the electric heating alloy layer (4), the lower insulation layer (5) and the lower reinforcement layer (6) are connected in sequence by hot pressing.