Radiation-resistant and high-temperature-resistant heater and fixing structure
Through the laminated structure of polyimide insulated wires and electric heating circuits, combined with protection and position adjustment mechanisms, the radiation resistance problem of polyimide film electric heaters outside the spacecraft cabin is solved, and convenient maintenance and position adjustment are achieved.
Patent Information
- Application Number
- CN202422757551.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-11-12
AI Technical Summary
Existing polyimide film electric heaters cannot be used in the high-irradiation environment outside the spacecraft cabin, and the existing fixed structure is not easy to maintain.
The laminated structure of polyimide insulated wires and electric heating circuits is adopted, combined with protection, position adjustment and anti-falling mechanisms to improve radiation resistance and facilitate maintenance.
It achieves radiation resistance in the spacecraft extravehicular environment, extends service life, and facilitates position adjustment and maintenance.
Smart Images
Figure CN223391460U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of polyimide electric heaters, in particular to a radiation-resistant and high-temperature-resistant heater and a fixing structure. Background Art
[0002] Polyimide type electric heater is an electric heater that uses polyimide material as the insulation layer and base material. Polyimide is a high-performance polymer with excellent thermal stability, insulation and chemical resistance, and has been widely used in electric heaters.
[0003] The insulation layer of existing polyimide flexible film heaters is composed of a composite of polyimide film and adhesive, and the adhesive is mostly epoxy resin or acrylic system. Polyimide film electric heaters can only be used in the spacecraft cabin environment with a total radiation dose of no more than 1.0x107rad (SI). However, the total radiation dose in the spacecraft extravehicular environment reaches 1.0x1010rad (SI). Therefore, existing polyimide film electric heaters cannot be used in the spacecraft extravehicular environment.
[0004] At the same time, the fixing structure of the thin film heater in the prior art is mostly to fix the film itself, for example, using adhesives to fix the heater on the object to be heated, without considering the subsequent maintenance of the heater and other operations. Furthermore, the use of chemical bonding methods such as adhesives to fix the heater will affect the subsequent inspection and maintenance of the heater by maintenance personnel, and thus this application is proposed. Utility Model Content
[0005] The purpose of the present utility model is to provide a radiation-resistant and high-temperature-resistant heater and a fixing structure thereof, so as to solve the problems raised in the above-mentioned background technology.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a radiation-resistant and high-temperature-resistant heater, comprising an insulating layer and a heating layer, a connecting wire is installed between the insulating layer and the heating layer, the connecting wire is a polyimide insulated wire, the insulating layer comprises liquid polyimide, the heating layer comprises an electric heating circuit, the electric heating circuit is arranged through an arrangement shape, and the polyimide insulated wire, liquid polyimide and the electric heating circuit form a heater through a laminated structure.
[0007] Furthermore, the laminated structure includes a top layer, a middle layer and a bottom layer, the top layer and the bottom layer are both liquid polyimide, and the middle layer is an electric heating circuit and a polyimide insulated wire.
[0008] Furthermore, the arrangement shapes include an S-shaped arrangement for adapting to simple heating requirements, a double S-shaped arrangement for adapting to large-scale uniform heating requirements, and a U-shaped arrangement.
[0009] A radiation-resistant and high-temperature resistant heater fixing structure uses the above-mentioned radiation-resistant and high-temperature resistant heater. The fixing structure includes a heater body and a protective mechanism wrapped on the outer wall of the heater body. The protective mechanism is connected to a position adjustment mechanism, and the heating position of the heater body is adjusted by fixing the position adjustment mechanism. The position adjustment mechanism is equipped with an anti-falling mechanism for preventing the protective mechanism from falling off the position adjustment mechanism. The position adjustment mechanism is equipped with a contact adjustment mechanism for adjusting the distance between the heater body and the heated object.
[0010] Furthermore, the protective mechanism includes a first protective cover and a second protective cover, and a accommodating cavity is formed by merging the first protective cover and the second protective cover, the heater body is installed in the accommodating cavity, the first protective cover is provided with an annular groove, the second protective cover is fixedly connected with an annular block inserted in the annular groove, the outer walls of the first protective cover and the second protective cover are provided with edge grooves, and the outer walls of the first protective cover and the second protective cover are installed with thermochromic films.
[0011] Furthermore, the position adjustment mechanism includes a first track, a second track and an additional track with a T-shaped internal sliding channel, the top outer wall and the bottom outer wall of the first protective cover and the second protective cover are fixedly connected with an L-shaped block, and the L-shaped block is spliced into a T-shaped block by merging the first protective cover and the second protective cover, and the T-shaped block is inserted into the sliding channel of the first track, the second track and the additional track, and the outer wall of one end of the first track and the outer wall of one end of the additional track are fixedly connected with a connecting block, and the outer wall of the other end of the second track and the outer wall of the other end of the additional track are provided with a connecting groove, and the first track, the second track and the additional track are connected by the connecting block and the connecting groove, and a number of through grooves are provided on the outer walls of the first track, the second track and the additional track, one of the through grooves is provided with a limiting pin, and a circular groove is provided on the L-shaped block, and the limiting pin is inserted into the circular groove through the through groove to complete the fixed limitation of the heater body.
[0012] Furthermore, the anti-falling mechanism includes a vertical rod installed on the top outer wall of the first rail and the second rail near the rail opening, a fixing plate is fixedly connected to the top outer wall of the vertical rod, an ear plate is sleeved on the vertical rod, a shielding plate is fixedly connected to the ear plate, and a spring is installed between the fixing plate and the ear plate and surrounds the vertical rod.
[0013] Furthermore, mounting blocks are installed on the outer walls of the first track, the second track and the additional track, and mounting grooves are provided on the mounting blocks. An insert block is fixedly connected to the outer wall on one side of the mounting block, and a slot is provided on the outer wall on the other side of the mounting block.
[0014] Compared with the prior art, the beneficial effects of the present invention are:
[0015] The radiation-resistant and high-temperature-resistant heater and its fixing structure, through the provided insulating layer, can increase the total radiation dose resistance of the electric heater to a level that can meet the requirements of the spacecraft extravehicular use environment. The provided protective mechanism can provide a protective effect for the heater body to extend the service life of the heater body. The provided position adjustment mechanism can make the heating position of the heater body adjustable, and the disassembly and assembly are convenient, making it easy for subsequent maintenance personnel to perform quick repairs. The provided contact adjustment mechanism can adjust the distance between the heater body and the heated object, which is convenient for heating parts with different degrees of protrusion. The provided anti-falling mechanism can prevent the heater body from falling off from the position adjustment mechanism, making it easy to use.
[0016] At the same time, by setting two L-shaped blocks to form a T-shaped block, it can move in the sliding channels of the first track, the second track and the added track, and then the position of the protective mechanism and the heater body can be changed. Changing the position is simple and fast, and easy to use. When changing the position, just pull out the limit pin from the circular groove and the through groove. After the position is changed, insert the limit pin from the circular groove into the corresponding through groove to complete the position fixation. By setting the added track in conjunction with the connecting block and the connecting groove, the length of the position adjustment mechanism can be adjusted according to actual needs, which is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0018] Figure 2 This is a schematic diagram of the explosion structure of the protection mechanism of the utility model;
[0019] Figure 3 This is a schematic diagram of the first track structure of the present utility model;
[0020] Figure 4 This is a schematic diagram of the second track structure of the present utility model;
[0021] Figure 5 This is a schematic diagram of the added track structure of the utility model;
[0022] Figure 6 This is a schematic diagram of the heater structure of the present utility model;
[0023] Figure 7 It is a schematic diagram of the laminated structure of the present utility model.
[0024] In the figure: 1. Heater body; 2. Protection mechanism; 201. First protective cover; 202. Annular groove; 203. Annular block; 204. Second protective cover; 205. Thermochromic film; 206. Edge groove; 3. Position adjustment mechanism; 301. L-shaped block; 302. First track; 303. Through groove; 304. Connecting block; 305. Connecting groove; 306. Second track; 307. Limit pin; 308. Add track; 4. Anti-falling mechanism; 401. Vertical rod; 402. Fixing plate; 403. Spring; 404. Ear plate; 405. Shielding plate; 5. Contact adjustment mechanism; 501. Mounting block; 502. Insert block; 503. Slot; 504. Mounting groove; 6. Polyimide insulated wire; 7. Electric heating circuit; 8. Liquid polyimide. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0026] In the process of heating components in aerospace and other fields, heaters and their fixing structures are needed. The heater and its fixing structure provided by the present invention are specifically used to cope with multi-point heating and heating operations with adjustable contact spacing. In the process of using this heater and its fixing structure for heating operations, it is necessary to power the components in the heater and its fixing structure that require power to operate in advance, so as to ensure the normal operation of the heating.
[0027] like Figure 6-Figure 7 As shown, the utility model provides a technical solution: a radiation-resistant and high-temperature-resistant heater, comprising an insulating layer and a heating layer, a connecting wire is installed between the insulating layer and the heating layer, the connecting wire is a polyimide insulated wire 6, the insulating layer comprises liquid polyimide 8, the heating layer comprises an electric heating circuit 7, the electric heating circuit 7 is arranged through an arrangement shape, and the polyimide insulated wire 6, the liquid polyimide 8 and the electric heating circuit 7 form a heater through a laminated structure.
[0028] As shown in FIG7 , the laminated structure includes a top layer, a middle layer and a bottom layer. The top layer and the bottom layer are both liquid polyimide 8 , and the middle layer is an electric heating circuit 7 and a polyimide insulated wire 6 .
[0029] It should be noted that the manufacturing process of the heater is:
[0030] Step 1: Liquid polyimide is coated on the heating metal foil through screen printing process;
[0031] Step 2: Dry in a vacuum or air-blast oven in seven stages:
[0032] 80℃ / 20min, 120℃ / 30min, 180℃ / 30min, 200℃ / 10min, 220℃ / 20min, 250℃ / 30min, 280℃ / 20min;
[0033] Step 3: Design the heating circuit pattern according to the heating area and power requirements, and obtain a complete heating circuit through etching process;
[0034] Step 4: Coating liquid polyimide on the heating metal foil through screen printing process;
[0035] Step 5: Dry in a vacuum or air-blast oven in seven stages:
[0036] 80℃ / 20min, 120℃ / 30min, 180℃ / 30min, 200℃ / 10min, 220℃ / 20min, 250℃ / 30min, 280℃ / 20min;
[0037] Step 6: Solder the lead wires and the heating circuit pads using soldering or resistance welding.
[0038] Through the insulating layer, the total radiation dose resistance of the electric heater is increased to 1.0x1010rad (SI), the relative change rate of the resistance value is no more than ±2%, and under a DC voltage of 500V, the insulation resistance is no less than 100M, which can meet the requirements of the spacecraft extravehicular use environment. In a vacuum better than 1X10-3Pa, the heater is heated to 260℃±5℃ and operated for 20 hours. There is no blistering, delamination or obvious discoloration on the appearance of the heater, and the relative change of the resistance value is no more than ±2%. Under a DC voltage of 500V, the insulation resistance is no less than 100M, which can meet the requirements of the spacecraft extravehicular use environment.
[0039] The layout shapes include S-shaped layout for adapting to simple heating needs, double S-shaped layout for large-scale uniform heating needs, and U-shaped layout.
[0040] It should be noted that the S-shaped layout is formed by a continuous electric heating wire, presenting one or more "S"-shaped curve designs. The S-shaped layout is relatively simple and is suitable for heating smaller heating areas or simple-shaped surfaces. It can effectively disperse heat, but there may be local temperature differences in certain areas. The double S-shaped layout contains two or more electric heating wires configured in an "S" shape, usually presenting two opposite "S"-shaped structures, forming an "8"-shaped or double "S"-shaped staggered arrangement. The double S-shaped layout can distribute heat more effectively by increasing the number of electric heating wires and staggering their arrangement, while reducing overheating and cold spots in certain specific areas and improving overall temperature uniformity. The meandering arrangement is also called a ring or closed coil arrangement. The meandering arrangement can provide more uniform heat distribution, reduce hot spots and cold spots, and keep the temperature of the heated surface relatively consistent. The three arrangements of the electric heating circuit 7 can be selected according to the actual use scenario of the heater, and one of them can be used as the electric heating circuit 7 of the heater.
[0041] like Figure 1-Figure 5 As shown, a radiation-resistant and high-temperature-resistant heater fixing structure includes a heater body 1 and a protective mechanism 2 wrapped around the outer wall of the heater body 1. The protective mechanism 2 is connected to a position adjustment mechanism 3, and the heating position of the heater body 1 is adjusted by fixing the position adjustment mechanism 3. The position adjustment mechanism 3 is equipped with an anti-falling mechanism 4 for preventing the protective mechanism 2 from falling off the position adjustment mechanism 3, and the position adjustment mechanism 3 is equipped with a contact adjustment mechanism 5 for adjusting the distance between the heater body 1 and the heated object.
[0042] It should be noted that, through the protection mechanism 2 provided, a protection effect is provided for the heater body 1 to extend the service life of the heater body 1; through the position adjustment mechanism 3 provided, the heating position of the heater body 1 can be adjusted, and it is convenient to disassemble and assemble, and easy for subsequent maintenance personnel to perform quick repairs; through the contact adjustment mechanism 5 provided, the distance between the heater body 1 and the heated object can be adjusted, which is convenient for heating parts with different degrees of protrusion; through the anti-falling mechanism 4 provided, the heater body 1 is not easy to fall off from the position adjustment mechanism 3, and is easy to use.
[0043] like Figure 2 As shown, the protective mechanism 2 includes a first protective cover 201 and a second protective cover 204. A receiving cavity is formed by merging the first protective cover 201 and the second protective cover 204. The heater body 1 is installed in the receiving cavity. An annular groove 202 is provided on the first protective cover 201. An annular block 203 inserted into the annular groove 202 is fixedly connected to the second protective cover 204. An edge groove 206 is provided on the outer walls of the first protective cover 201 and the second protective cover 204. A thermochromic film 205 is installed on the outer walls of the first protective cover 201 and the second protective cover 204.
[0044] It should be noted that when the protective mechanism 2 needs to be used, the first protective cover 201 and the second protective cover 204 are provided to provide all-round protection for the heater body 1. At the same time, the contact surface with the heater body 1 can be made of heat-conducting material, such as copper. The annular groove 202 is provided to cooperate with the annular block 203, so that the first protective cover 201 and the second protective cover 204 are more tightly sealed when combined, which is convenient for use. The edge groove 206 is provided to add another fixing method, and the protective mechanism 2 is installed together with the heater body 1 on the heating part by gluing double-sided tape. The thermochromic film 205 is provided to facilitate the staff to observe the heating part of the heater body 1, which is conducive to more accurate finding of the heating part and alignment with the heated part.
[0045] like Figure 2-Figure 5 As shown, the position adjustment mechanism 3 includes a first track 302, a second track 306 and an additional track 308 with a T-shaped internal sliding channel. The top outer wall and the bottom outer wall of the first protective cover 201 and the second protective cover 204 are fixedly connected with an L-shaped block 301. The L-shaped block 301 is spliced into a T-shaped block by merging the first protective cover 201 and the second protective cover 204. The T-shaped block is inserted into the sliding channels of the first track 302, the second track 306 and the additional track 308. The outer wall of one end of the first track 302 and the outer wall of one end of the additional track 308 are fixedly connected with a connecting Block 304, the outer wall of the other end of the second track 306 and the outer wall of the other end of the added track 308 are all provided with a connecting groove 305, and the first track 302, the second track 306 and the added track 308 are connected by the connecting block 304 and the connecting groove 305. A plurality of through grooves 303 are provided on the outer walls of the first track 302, the second track 306 and the added track 308, and a limiting pin 307 is provided on one of the through grooves 303. A circular groove is provided on the L-shaped block 301, and the limiting pin 307 is inserted into the circular groove through the through groove 303 to complete the fixed limit of the heater body 1.
[0046] It should be noted that by setting two L-shaped blocks 301 to form a T-shaped block, it can move in the sliding channels of the first track 302, the second track 306 and the additional track 308, thereby changing the position of the protection mechanism 2 and the heater body 1. Changing the position is simple and fast, and easy to use. When changing the position, just pull out the limit pin 307 from the circular groove and the through groove 303. After the position is changed, the limit pin 307 is inserted from the circular groove into the corresponding through groove 303 to complete the position fixation. By setting the additional track 308 in conjunction with the connecting block 304 and the connecting groove 305, the length of the position adjustment mechanism 3 can be adjusted according to actual needs, which is convenient for use. At the same time, multiple protection mechanisms 2 can be added to one position adjustment mechanism 3 to match the heater body 1.
[0047] like Figure 3 As shown, the anti-falling mechanism 4 includes a vertical rod 401 installed on the top outer wall of the first rail 302 and the second rail 306 near the rail mouth, a fixing plate 402 is fixedly connected to the top outer wall of the vertical rod 401, an ear plate 404 is sleeved on the vertical rod 401, a shielding plate 405 is fixedly connected to the ear plate 404, and a spring 403 is installed between the fixing plate 402 and the ear plate 404 and surrounds the vertical rod 401.
[0048] It should be noted that when the anti-falling mechanism 4 needs to be used, by pulling the shielding plate 405 and compressing the spring 403 until it completely leaks out from the track mouth of the first track 302 and the second track 306, the protective mechanism 2 and the heater body 1 can be removed from the anti-falling mechanism 4, which is convenient for use. Otherwise, it can be reset and installed.
[0049] like Figure 3-Figure 5 As shown, mounting blocks 501 are installed on the outer walls of the first track 302, the second track 306 and the additional track 308, and mounting slots 504 are provided on the mounting blocks 501. An insert block 502 is fixedly connected to the outer wall on one side of the mounting block 501, and a slot 503 is provided on the outer wall on the other side of the mounting block 501.
[0050] It should be noted that, by setting the mounting block 501, the plug block 502 and the slot 503, the number of mounting blocks 501 can be increased or decreased according to the spacing requirements, so that the spacing between the heater body 1 and the heated object can be adjusted so that heating parts with different protrusion heights can be used. By setting the mounting groove 504 in combination with the fixing bolts, the positions of the first track 302, the second track 306 and the added track 308 can be fixed.
[0051] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is limited by the accompanying embodiments and their equivalents.
Claims
1. A radiation-resistant and high-temperature-resistant heater, comprising an insulating layer and a heating layer, characterized in that: A connecting wire is installed between the insulating layer and the heating layer, the connecting wire is a polyimide insulated wire (6), the insulating layer includes liquid polyimide (8), the heating layer includes an electric heating circuit (7), the electric heating circuit (7) is arranged in a circuit shape, and the polyimide insulated wire (6), the liquid polyimide (8) and the electric heating circuit (7) form a heater through a laminated structure.
2. The radiation-resistant and high-temperature-resistant heater according to claim 1, characterized in that: The laminated structure comprises a top layer, a middle layer and a bottom layer, the top layer and the bottom layer are both liquid polyimide (8), and the middle layer is an electric heating circuit (7) and a polyimide insulated wire (6).
3. The radiation-resistant and high-temperature-resistant heater according to claim 1, characterized in that: The arrangement shapes include an S-shaped arrangement for adapting to simple heating requirements, a double S-shaped arrangement for adapting to large-scale uniform heating requirements, and a U-shaped arrangement.
4. A fixing structure for a radiation-resistant and high-temperature-resistant heater, using a radiation-resistant and high-temperature-resistant heater according to any one of claims 1 to 3, characterized in that: The fixed structure comprises a heater body (1) and a protective mechanism (2) wrapped around the outer wall of the heater body (1); the protective mechanism (2) is connected to a position adjustment mechanism (3); the heating position of the heater body (1) is adjusted by fixing the position adjustment mechanism (3); the position adjustment mechanism (3) is equipped with an anti-falling mechanism (4) for preventing the protective mechanism (2) from falling off the position adjustment mechanism (3); and the position adjustment mechanism (3) is equipped with a contact adjustment mechanism (5) for adjusting the distance between the heater body (1) and the heated object.
5. The fixing structure of the radiation-resistant and high-temperature-resistant heater according to claim 4, characterized in that: The protective mechanism (2) comprises a first protective cover (201) and a second protective cover (204); a housing cavity is formed by merging the first protective cover (201) and the second protective cover (204); the heater body (1) is installed in the housing cavity; an annular groove (202) is provided on the first protective cover (201); an annular block (203) is fixedly connected to the second protective cover (204) and inserted into the annular groove (202); an edge groove (206) is provided on the outer walls of the first protective cover (201) and the second protective cover (204); and a thermochromic film (205) is installed on the outer walls of the first protective cover (201) and the second protective cover (204).
6. The fixing structure of a radiation-resistant and high-temperature-resistant heater according to claim 4, characterized in that: The position adjustment mechanism (3) comprises a first track (302), a second track (306) and an additional track (308) with a T-shaped internal sliding channel; the top outer wall and the bottom outer wall of the first protective cover (201) and the second protective cover (204) are fixedly connected with an L-shaped block (301); the L-shaped block (301) is spliced into a T-shaped block by merging the first protective cover (201) and the second protective cover (204); the T-shaped block is inserted into the sliding channels of the first track (302), the second track (306) and the additional track (308); the outer wall of one end of the first track (302) and the outer wall of one end of the additional track (308) are fixedly connected with the connecting block (301); 4), the outer wall of the other end of the second track (306) and the outer wall of the other end of the additional track (308) are both provided with a connecting groove (305), the first track (302), the second track (306) and the additional track (308) are connected by the connecting block (304) and the connecting groove (305), a plurality of through grooves (303) are provided on the outer walls of the first track (302), the second track (306) and the additional track (308), one of the through grooves (303) is provided with a limiting pin (307), a circular groove is provided on the L-shaped block (301), and the limiting pin (307) is inserted into the circular groove through the through groove (303) to complete the fixed limit of the heater body (1).
7. The fixing structure of a radiation-resistant and high-temperature-resistant heater according to claim 4, characterized in that: The anti-fall mechanism (4) comprises a vertical rod (401) installed on the top outer wall of the first track (302) and the second track (306) near the track opening; a fixing plate (402) is fixedly connected to the top outer wall of the vertical rod (401); a lug plate (404) is sleeved on the vertical rod (401); a shielding plate (405) is fixedly connected to the lug plate (404); and a spring (403) surrounding the vertical rod (401) is installed between the fixing plate (402) and the lug plate (404).
8. The fixing structure of a radiation-resistant and high-temperature-resistant heater according to claim 6, characterized in that: The outer walls of the first track (302), the second track (306) and the additional track (308) are all equipped with mounting blocks (501), the mounting blocks (501) are provided with mounting grooves (504), one side of the outer wall of the mounting block (501) is fixedly connected with an insert block (502), and the other side of the outer wall of the mounting block (501) is provided with a slot (503).