Expansion type thermal switch based on paper-cut structure

Abstract

The invention belongs to the technical field of thermal switches, and particularly relates to an expansion type thermal switch based on a paper-cut structure, which comprises a thermal expansion paper-cut structure, the thermal expansion paper-cut structure is a central symmetry structure, two ends of the thermal expansion paper-cut structure are fixedly connected through a fixing plate, and the top end of the thermal expansion paper-cut structure is fixedly connected with the bottom end of a fixed heat source; the negative thermal expansion paper-cut structure is of a central symmetry structure, the two ends of the negative thermal expansion paper-cut structure are fixedly connected through a fixing plate, and the bottom end of the negative thermal expansion paper-cut structure is fixedly connected with the top end of the fixed cold source; the thermal expansion paper-cut structure and the negative thermal expansion paper-cut structure are horizontally arranged in parallel, a first gap is reserved between the bottom end of the thermal expansion paper-cut structure and the top end of the fixed cold source, and a second gap is reserved between the top end of the negative thermal expansion paper-cut structure and the bottom end of the fixed heat source. The invention has the advantages of larger thermal stroke, extremely small contact thermal resistance, larger switch ratio and long service life in overheat and overcold space environments.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of thermal switches, and particularly relates to an expansion type thermal switch based on a paper-cut structure. BACKGROUND

[0002] A thermal switch is an important component widely used in the field of aerospace control systems to control temperature changes. Its function is to open or close when the ambient temperature is too high or too low to protect the internal circuit from overheating damage or overcooling failure. According to the working principle of the thermal switch, it can be divided into: piezoelectric brake type thermal switch, memory alloy thermal switch, reciprocating contact thermal switch, and one-way micro-expansion type thermal switch.

[0003] The piezoelectric brake type thermal switch has a complex internal circuit, many high-voltage components, and generates vibration, and needs to be manually operated or maintained. The memory alloy thermal switch has a short service life and is prone to misalignment and other changes. The reciprocating contact thermal switch has a complex structure and large contact thermal resistance, and can only passively keep warm when overcooling. The one-way micro-expansion type thermal switch has a large switching ratio and small thermal resistance, but requires a large temperature difference to close the switch and has a small thermal travel, and can only passively keep warm when overcooling.

[0004] Therefore, it is necessary to design an expansion type thermal switch based on a paper-cut structure to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide an expansion type thermal switch based on a paper-cut structure, which has the advantages of large thermal travel, small contact thermal resistance, large switching ratio, and long service life in the overheat and overcooling environment in space.

[0006] To achieve the above purpose, the present application provides the following scheme: an expansion type thermal switch based on a paper-cut structure, comprising a thermal expansion paper-cut structure, which is a center-symmetric structure, both ends of the thermal expansion paper-cut structure are fixedly connected through a fixed plate, and the top end of the thermal expansion paper-cut structure is fixedly connected with the bottom end of a fixed heat source; a negative thermal expansion paper-cut structure, which is a center-symmetric structure, both ends of the negative thermal expansion paper-cut structure are fixedly connected through the fixed plate, and the bottom end of the negative thermal expansion paper-cut structure is fixedly connected with the top end of a fixed cold source; The thermal expansion paper-cut structure and the negative thermal expansion paper-cut structure are arranged horizontally and in parallel, a first gap is left between the bottom end of the thermal expansion paper-cut structure and the top end of the fixed cold source, and a second gap is left between the top end of the negative thermal expansion paper-cut structure and the bottom end of the fixed heat source.

[0007] Preferably, the thermal expansion paper-cut structure comprises two third skeletons arranged in an upper and lower interval, one end of each of the third skeletons is fixedly connected with one end of a second skeleton through a first connecting part, the other end of the second skeleton is fixedly connected with one end of a first skeleton through a second connecting part, and the other end of the first skeleton is fixedly connected with a fixed heat source side wall through the fixed plate.

[0008] Preferably, the two first connecting parts located on the same side of the two third skeletons are arranged close to each other, the first connecting part comprises a third hinge and a fourth hinge, the two ends of the third hinge are fixedly connected with the third skeleton and the second skeleton respectively, the two ends of the fourth hinge are fixedly connected with the third skeleton and the second skeleton respectively, and the two fourth hinges are located between the two third hinges.

[0009] Preferably, the two second connecting parts are arranged away from each other, the second connecting part comprises a first hinge and a second hinge, the two ends of the first hinge are fixedly connected with the second skeleton and the first skeleton respectively, the two ends of the second hinge are fixedly connected with the second skeleton and the first skeleton respectively, and the two second hinges are located between the two first hinges.

[0010] Preferably, the third skeleton and the second skeleton located on the upper side are fixedly connected with the bottom end of the fixed heat source, the top end of the first skeleton is fixedly connected with the bottom end of the fixed heat source, the third skeleton and the second skeleton located on the lower side leave the first gap between the top end of the fixed cold source, and the bottom end of the first skeleton leaves the first gap between the top end of the fixed cold source.

[0011] Preferably, the negative thermal expansion paper-cut structure comprises two sixth skeletons arranged in an upper and lower interval, one end of each of the sixth skeletons is fixedly connected with one end of a fifth skeleton through a third connecting part, the other end of the fifth skeleton is fixedly connected with one end of a fourth skeleton through a fourth connecting part, and the other end of the fourth skeleton is fixedly connected with a fixed cold source side wall through the fixed plate.

[0012] Preferably, the two third connecting parts located on the same side of the two sixth skeletons are arranged close to each other, the third connecting part comprises a seventh hinge and an eighth hinge, the two ends of the seventh hinge are fixedly connected with the sixth skeleton and the fifth skeleton respectively, the two ends of the eighth hinge are fixedly connected with the sixth skeleton and the fifth skeleton respectively, and the two eighth hinges are located between the two seventh hinges.

[0013] Preferably, the two fourth connecting parts are arranged away from each other, the fourth connecting part comprises a fifth hinge and a sixth hinge, the fifth hinge is fixedly connected with the fifth framework and the fourth framework at two ends respectively, the sixth hinge is fixedly connected with the fifth framework and the fourth framework at two ends respectively, and the two sixth hinges are located between the two fifth hinges.

[0014] Preferably, the lower sixth framework and the fifth framework are fixedly connected with the top end of the fixed cold source, the bottom end of the fourth framework is fixedly connected with the top end of the fixed cold source, the upper sixth framework and the fifth framework are left with the second gap between the bottom end of the fixed hot source, and the top end of the fourth framework is left with the second gap between the bottom end of the fixed hot source.

[0015] Preferably, the first gap is 9mm-9.5mm, and the second gap is 9mm-9.5mm.

[0016] Compared with the prior art, the application has the following advantages and technical effects: The expansion type thermal switch based on the paper-cut structure has the advantages of large thermal travel, extremely small contact thermal resistance, large switch ratio and long service life when operating in the space overheat and supercooling environment. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor based on these drawings: Figure 1 The whole structure of the present application is shown Figure 1 ; Figure 2 The whole structure of the present application is shown Figure 2 ; Figure 3 The thermal expansion paper-cut structure of the present application is shown Figure 4 The partial enlarged view of A in Figure 3 ; Figure 5 The partial enlarged view of B in Figure 3 ; Figure 6 The negative thermal expansion paper-cut structure of the present application is shown Figure 7 The partial enlarged view of C in Figure 6 ; Figure 8 The partial enlarged view of D in Figure 6 ;

[0018] Among them, 1. Fixed plate; 2. Connecting spring; 3. Thermal expansion paper-cutting structure; 301. First frame; 302. Second frame; 303. Third frame; 304. First hinge; 305. Second hinge; 306. Third hinge; 307. Fourth hinge; 4. Fixed heat source; 5. Fixed cold source; 6. Negative thermal expansion paper-cutting structure; 601. Fourth frame; 602. Fifth frame; 603. Sixth frame; 604. Fifth hinge; 605. Sixth hinge; 606. Seventh hinge; 607. Eighth hinge. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figures 1 to 8 As shown, the present invention provides an expansion-type thermal switch based on a paper-cut structure, including... The thermal expansion paper-cutting structure 3 is a centrally symmetrical structure. The two ends of the thermal expansion paper-cutting structure 3 are fixedly connected by the fixing plate 1. The top end of the thermal expansion paper-cutting structure 3 is fixedly connected to the bottom end of the fixed heat source 4. The negative thermal expansion paper-cutting structure 6 is a centrally symmetrical structure. The two ends of the negative thermal expansion paper-cutting structure 6 are fixedly connected by the fixing plate 1, and the bottom end of the negative thermal expansion paper-cutting structure 6 is fixedly connected to the top end of the fixed cold source 5. The thermal expansion paper-cutting structure 3 and the negative thermal expansion paper-cutting structure 6 are set horizontally parallel to each other. A first gap is left between the bottom of the thermal expansion paper-cutting structure 3 and the top of the fixed cold source 5, and a second gap is left between the top of the negative thermal expansion paper-cutting structure 6 and the bottom of the fixed heat source 4.

[0022] The fixed heat source 4 and the fixed cold source 5 are made of low-temperature, high thermal conductivity materials, which enable efficient heat transfer when in contact.

[0023] Both the thermal expansion paper-cutting structure 3 and the negative thermal expansion paper-cutting structure 6 have their outer surfaces covered with a 0.3mm thin copper sheet.

[0024] The first and second gaps can maintain thermal insulation.

[0025] The lower surface of the thermal expansion paper-cutting structure 3 and the upper surface of the negative thermal expansion paper-cutting structure 6 are coated with a coating with low emissivity.

[0026] Both ends of the thermal expansion paper-cutting structure 3 and both ends of the negative thermal expansion paper-cutting structure 6 are connected to the fixed plate 1 by connecting spring 2. The connecting spring 2 is a conical spring. Both the fixed plate 1 and the connecting spring 2 are made of high temperature resistant and low thermal conductivity material.

[0027] The scheme is further optimized. The thermal expansion paper-cutting structure 3 includes two third skeletons 303 arranged at intervals. The two ends of the third skeleton 303 are respectively fixedly connected to one end of the second skeleton 302 through the first connecting part. The other end of the second skeleton 302 is fixedly connected to one end of the first skeleton 301 through the second connecting part. The other end of the first skeleton 301 is fixedly connected to the side wall of the fixed heat source 4 through the fixing plate 1.

[0028] In a further optimized design, two first connecting parts located on the same side of the two third frames 303 are arranged close to each other. The first connecting part includes a third hinge 306 and a fourth hinge 307. The two ends of the third hinge 306 are fixedly connected to the third frame 303 and the second frame 302 respectively. The two ends of the fourth hinge 307 are fixedly connected to the third frame 303 and the second frame 302 respectively. The two fourth hinges 307 are located between the two third hinges 306.

[0029] In a further optimized design, the two second connecting parts are positioned far apart from each other. Each second connecting part includes a first hinge 304 and a second hinge 305. The two ends of the first hinge 304 are fixedly connected to the second frame 302 and the first frame 301, respectively. The two ends of the second hinge 305 are fixedly connected to the second frame 302 and the first frame 301, respectively. The two second hinges 305 are located between the two first hinges 304.

[0030] In a further optimized design, the upper third frame 303 and the second frame 302 are fixedly connected to the bottom of the fixed heat source 4, the top of the first frame 301 is fixedly connected to the bottom of the fixed heat source 4, and a first gap is left between the lower third frame 303 and the second frame 302 and the top of the fixed cold source 5, and a first gap is left between the bottom of the first frame 301 and the top of the fixed cold source 5.

[0031] The second hinge 305 and the third hinge 306 are made of materials with a high coefficient of thermal expansion, the first hinge 304 and the fourth hinge 307 are made of materials with a low coefficient of thermal expansion, and the first skeleton 301, the second skeleton 302 and the third skeleton 303 are made of materials with high thermal conductivity at low temperature.

[0032] The scheme is further optimized. The negative thermal expansion paper-cutting structure 6 includes two sixth skeletons 603 arranged at intervals. The two ends of the sixth skeleton 603 are respectively fixedly connected to one end of the fifth skeleton 602 through the third connecting part. The other end of the fifth skeleton 602 is fixedly connected to one end of the fourth skeleton 601 through the fourth connecting part. The other end of the fourth skeleton 601 is fixedly connected to the side wall of the fixed cold source 5 through the fixing plate 1.

[0033] In a further optimized design, two third connecting parts located on the same side of the two sixth frames 603 are arranged close to each other. The third connecting parts include a seventh hinge 606 and an eighth hinge 607. The two ends of the seventh hinge 606 are fixedly connected to the sixth frame 603 and the fifth frame 602 respectively, and the two ends of the eighth hinge 607 are fixedly connected to the sixth frame 603 and the fifth frame 602 respectively. The two eighth hinges 607 are located between the two seventh hinges 606.

[0034] In a further optimized design, the two fourth connecting parts are positioned far apart from each other. The fourth connecting parts include a fifth hinge 604 and a sixth hinge 605. The two ends of the fifth hinge 604 are fixedly connected to the fifth frame 602 and the fourth frame 601, respectively. The two ends of the sixth hinge 605 are fixedly connected to the fifth frame 602 and the fourth frame 601, respectively. The two sixth hinges 605 are located between the two fifth hinges 604.

[0035] In a further optimized design, the sixth frame 603 and the fifth frame 602 located below are fixedly connected to the top of the fixed cold source 5, the bottom of the fourth frame 601 is fixedly connected to the top of the fixed cold source 5, a second gap is left between the sixth frame 603 and the fifth frame 602 located above and the bottom of the fixed heat source 4, and a second gap is left between the top of the fourth frame 601 and the bottom of the fixed heat source 4.

[0036] The design was further optimized, with the first gap being 9mm-9.5mm and the second gap being 9mm-9.5mm.

[0037] The sixth hinge 605 and the seventh hinge 606 are made of materials with low thermal expansion coefficients, the fifth hinge 604 and the eighth hinge 607 are made of materials with high thermal expansion coefficients, and the fourth skeleton 601, the fifth skeleton 602 and the sixth skeleton 603 are made of materials with low temperature and high thermal conductivity.

[0038] The working process of this invention is as follows: When the fixed heat source 4 is above a certain set temperature, the thermal expansion paper-cutting structure 3 will expand until it comes into contact with the fixed cold source 5, thus closing the switch to dissipate heat until it falls below a certain temperature, at which point the switch closes and maintains a constant temperature. When the fixed cold source 5 is below a certain set temperature, the negative thermal expansion paper-cutting structure 6 will expand until it comes into contact with the fixed heat source 4, thus closing the switch to restore heat until it rises above a certain temperature, at which point the switch closes and maintains the temperature.

[0039] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0040] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope of the present invention.

Claims

1. An expansion-type thermal switch based on a paper-cut structure, characterized in that, include The thermal expansion paper-cutting structure (3) is a centrally symmetrical structure. The two ends of the thermal expansion paper-cutting structure (3) are fixedly connected by a fixing plate (1). The top end of the thermal expansion paper-cutting structure (3) is fixedly connected to the bottom end of a fixed heat source (4). The negative thermal expansion paper-cutting structure (6) is a centrally symmetrical structure. The two ends of the negative thermal expansion paper-cutting structure (6) are fixedly connected by the fixing plate (1). The bottom end of the negative thermal expansion paper-cutting structure (6) is fixedly connected to the top end of the fixed cold source (5). The thermal expansion paper-cutting structure (3) and the negative thermal expansion paper-cutting structure (6) are arranged horizontally and parallel to each other. A first gap is left between the bottom end of the thermal expansion paper-cutting structure (3) and the top end of the fixed cold source (5), and a second gap is left between the top end of the negative thermal expansion paper-cutting structure (6) and the bottom end of the fixed heat source (4).

2. The expansion-type thermal switch based on a paper-cut structure according to claim 1, characterized in that, The thermal expansion paper-cutting structure (3) includes two third skeletons (303) spaced apart vertically. The two ends of the third skeleton (303) are respectively fixedly connected to one end of the second skeleton (302) through the first connecting part. The other end of the second skeleton (302) is fixedly connected to one end of the first skeleton (301) through the second connecting part. The other end of the first skeleton (301) is fixedly connected to the side wall of the fixed heat source (4) through the fixed plate (1).

3. The expansion-type thermal switch based on a paper-cut structure according to claim 2, characterized in that, Two first connecting parts located on the same side of the two third frames (303) are arranged close to each other. The first connecting part includes a third hinge (306) and a fourth hinge (307). The two ends of the third hinge (306) are fixedly connected to the third frame (303) and the second frame (302) respectively. The two ends of the fourth hinge (307) are fixedly connected to the third frame (303) and the second frame (302) respectively. The two fourth hinges (307) are located between the two third hinges (306).

4. The expansion-type thermal switch based on a paper-cut structure according to claim 2, characterized in that, The two second connecting parts are disposed far apart from each other. The second connecting parts include a first hinge (304) and a second hinge (305). The two ends of the first hinge (304) are fixedly connected to the second frame (302) and the first frame (301) respectively. The two ends of the second hinge (305) are fixedly connected to the second frame (302) and the first frame (301) respectively. The two second hinges (305) are located between the two first hinges (304).

5. The expansion-type thermal switch based on a paper-cut structure according to claim 2, characterized in that, The upper third frame (303) and the second frame (302) are fixedly connected to the bottom of the fixed heat source (4), the top of the first frame (301) is fixedly connected to the bottom of the fixed heat source (4), the lower third frame (303) and the second frame (302) are left with the first gap between them and the top of the fixed cold source (5), and the bottom of the first frame (301) is left with the first gap between it and the top of the fixed cold source (5).

6. The expansion-type thermal switch based on a paper-cut structure according to claim 1, characterized in that, The negative thermal expansion paper-cutting structure (6) includes two sixth skeletons (603) arranged at intervals. The two ends of the sixth skeleton (603) are respectively fixedly connected to one end of the fifth skeleton (602) through the third connecting part. The other end of the fifth skeleton (602) is fixedly connected to one end of the fourth skeleton (601) through the fourth connecting part. The other end of the fourth skeleton (601) is fixedly connected to the side wall of the fixed cold source (5) through the fixing plate (1).

7. The expansion-type thermal switch based on a paper-cut structure according to claim 6, characterized in that, Two third connecting parts located on the same side of the two sixth frames (603) are arranged close to each other. The third connecting parts include a seventh hinge (606) and an eighth hinge (607). The two ends of the seventh hinge (606) are fixedly connected to the sixth frame (603) and the fifth frame (602) respectively. The two ends of the eighth hinge (607) are fixedly connected to the sixth frame (603) and the fifth frame (602) respectively. The two eighth hinges (607) are located between the two seventh hinges (606).

8. The expansion-type thermal switch based on a paper-cut structure according to claim 6, characterized in that, The two fourth connecting parts are disposed far apart from each other. The fourth connecting parts include a fifth hinge (604) and a sixth hinge (605). The two ends of the fifth hinge (604) are fixedly connected to the fifth frame (602) and the fourth frame (601) respectively. The two ends of the sixth hinge (605) are fixedly connected to the fifth frame (602) and the fourth frame (601) respectively. The two sixth hinges (605) are located between the two fifth hinges (604).

9. The expansion-type thermal switch based on a paper-cut structure according to claim 6, characterized in that, The sixth frame (603) and the fifth frame (602) located below are fixedly connected to the top of the fixed cold source (5), the bottom of the fourth frame (601) is fixedly connected to the top of the fixed cold source (5), the sixth frame (603) and the fifth frame (602) located above are left with a second gap between them and the bottom of the fixed heat source (4), and the top of the fourth frame (601) is left with a second gap between it and the bottom of the fixed heat source (4).

10. The expansion-type thermal switch based on a paper-cut structure according to claim 1, characterized in that, The first gap is 9mm-9.5mm; the second gap is 9mm-9.5mm.

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