CN110686551A

CN110686551A - Thermal switch

Info

Publication number: CN110686551A
Application number: CN201910957387.2A
Authority: CN
Inventors: 陈琦; 于小龙
Original assignee: SHENZHEN AEROSPACE DONGFANGHONG DEVELOPMENT CO LTD
Current assignee: SHENZHEN AEROSPACE DONGFANGHONG DEVELOPMENT CO LTD
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-01-14

Abstract

The invention provides a thermal switch, which comprises a shell assembly and a thermal switch main body installed in the shell assembly, wherein the shell assembly comprises an upper end face, a heat insulation structure and a substrate, the heat insulation structure is arranged between the substrate and the upper end face to separate the heat conduction of the substrate and the upper end face, the thermal switch main body comprises a temperature sensitive driver, a ratchet and pawl mechanism, a driving column and a flexible heat conducting cable, the temperature sensitive driver is connected with the driving column through the ratchet and pawl mechanism, and the driving column is connected with the substrate through the flexible heat conducting cable. The invention has the beneficial effects that: the structure of the thermal switch is simplified, no power consumption is caused, no circuit requirement is required, and an effective thermal control means is provided for the spacecraft with violent thermal environment change.

Description

Thermal switch

Technical Field

The invention relates to a switch, in particular to a thermal switch.

Background

With the development of the spacecraft towards the large-scale track maneuver orbital transfer, multi-working mode and microminiaturization, the spacecraft puts forward higher requirements on a thermal control system. A thermal switch is a thermal control device capable of making and breaking a thermal connection between two components, which can automatically make or break a heat transfer path as needed. The thermal switch technology has an important role in solving the difficult problem of spacecraft thermal control design which needs frequent maneuvering or drastic external environment change, can passively control the temperature of electronic equipment, reduces the requirements on power and control circuits and software, and has important significance in optimizing the thermal control of the spacecraft.

The existing thermal switch has various working principles and a generally complex structure.

Disclosure of Invention

To solve the problems in the prior art, the present invention provides a thermal switch.

The invention provides a thermal switch comprising a housing assembly and a thermal switch body mounted within the housing assembly, the housing assembly includes an upper end face, a thermal insulation structure disposed between the substrate and the upper end face to separate thermal conduction from the substrate and the upper end face, the thermal switch main body comprises a temperature sensitive driver, a ratchet wheel and pawl mechanism, a driving column and a flexible heat conducting cable, the temperature sensitive driver is connected with the driving column through the ratchet wheel and pawl mechanism, the driving column is connected with the substrate through the flexible heat conducting cable, the driving column and the substrate are a moving pair, the temperature sensitive driver drives the driving column to reciprocate between a first position and a second position through a ratchet wheel and pawl mechanism, the first position is that the driving column is not in contact with the upper end face, and the second position is that the driving column is in contact with the upper end face.

As a further development of the invention, the temperature-sensitive actuator is connected in a thermally conductive manner to the substrate.

As a further improvement of the invention, the temperature sensitive driver mainly comprises a bimetallic strip, a corrugated pipe or an elastic element filled with liquid, is sensitive to temperature and can deform when the temperature changes so as to generate driving force.

As a further improvement of the present invention, the ratchet-pawl mechanism comprises a ratchet wheel connected to the temperature sensitive driver and a pawl connected to the drive column.

As a further improvement of the invention, the pawl is perpendicular to the moving axis of the driving column, and the pawl is in sliding fit with the tooth surface of the ratchet wheel.

As a further improvement of the invention, the substrate is mounted on a heat source side.

As a further improvement of the invention, at least one flexible heat conducting cable is arranged, and the flexible heat conducting cable is mainly formed by laminating multiple layers of high heat conducting graphite films.

As a further improvement of the invention, the base is provided with a guide groove, and the driving column is arranged in the guide groove.

The invention has the beneficial effects that: through the scheme, the structure of the thermal switch is simplified, no power consumption is caused, no circuit requirement is required, and an effective thermal control means is provided for the spacecraft with violent thermal environment change.

Drawings

Fig. 1 is an open schematic of a thermal switch of the present invention.

Fig. 2 is a schematic diagram of the closing of a thermal switch of the present invention.

Detailed Description

The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.

As shown in fig. 1 to 2, a thermal switch comprises a housing assembly and a thermal switch main body mounted in the housing assembly, wherein the housing assembly comprises an upper end face 3, a heat insulation structure 2 and a substrate 1, the heat insulation structure 2 is arranged between the substrate 1 and the upper end face 3 to separate heat conduction of the substrate 1 and the upper end face 2, the thermal switch main body comprises a temperature sensitive driver, a ratchet and pawl mechanism, a driving column 6 and a flexible heat conducting cable 7, the temperature sensitive driver is connected with the driving column 6 through the ratchet and pawl mechanism, the driving column 6 is connected with the substrate 1 through the flexible heat conducting cable 7, the driving column 6 and the substrate 1 are a moving pair, the temperature sensitive driver drives the driving column 6 to reciprocate between a first position and a second position through the ratchet and pawl mechanism, the first position is that the upper surface of the driving column 6 is not in contact with the upper end face 3, the second position is where the upper surface of the drive stud 6 is in contact with the upper end face 3.

As shown in fig. 1 to 2, the temperature-sensitive driver is thermally connected to the substrate 1.

As shown in fig. 1 to 2, the temperature sensitive actuator is mainly composed of a bimetal, a bellows, or an elastic element filled with liquid, is sensitive to temperature, and deforms when the temperature changes to generate a driving force.

As shown in fig. 1 to 2, the ratchet-pawl mechanism comprises a ratchet wheel 4 and a pawl 5, wherein the ratchet wheel 4 is connected with the temperature sensitive driver, and the pawl 5 is connected with the driving column 6.

As shown in fig. 1 to 2, the pawl 5 is perpendicular to the moving axis of the driving column 6, and the pawl 5 is in sliding fit with the tooth surface of the ratchet 4. The temperature sensitive driver drives the ratchet 4 to rotate. The ratchet 4 constrains the movement of the drive column 6 via the pawl 5. The pawl 5 is a fixed projection of the drive post 6. The pawl 5 is placed on a tooth of the ratchet wheel 4 and can slide on the tooth surface, and the position of the tooth surface is restricted by the movement of the ratchet wheel 4.

As shown in fig. 1 to 2, the substrate 1 is mounted on a heat source side and conducts heat well with a heat source.

As shown in fig. 1 to 2, a plurality of flexible heat conducting cables 7 are arranged between the lower surface of the driving column 6 and the base 1, and each flexible heat conducting cable 7 is formed by laminating a plurality of layers of high heat conducting graphite films, so that the heat conducting capability is good.

As shown in fig. 1 to 2, the base 1 is provided with a guide groove 8, and the driving column 6 is disposed inside the guide groove 8 and moves up and down along the guide groove 8.

According to the thermal switch provided by the invention, the ratchet wheel 4 rotates clockwise and anticlockwise to control the driving column 6 to reciprocate. When the temperature sensitive driver is heated and deformed, the ratchet wheel 4 rotates anticlockwise, the driving column 6 moves upwards and is fully contacted with the upper end face 3, a good heat conduction channel is generated between the upper end face 3 and the substrate 1, and heat flow at the substrate 1 can be conducted to the upper end face 3. When the temperature of the temperature sensitive driver is reduced, the ratchet wheel 4 rotates clockwise, the driving column 6 moves downwards to be separated from the upper end face 3, and a heat conduction channel between the upper end face 3 and the substrate 1 is cut off.

The thermal switch provided by the invention is a novel thermal switch, the ratchet wheel 4 is driven to rotate by the temperature sensitive driver, and the movement of the driving column 6 is further controlled, so that the on-off of a heat conduction path of the device is controlled, the thermal switch has the advantages of simple structure, no power consumption and no circuit requirement, and an effective thermal control means is provided for a spacecraft with violent thermal environment change.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A thermal switch, characterized by: comprising a housing assembly and a thermal switch body mounted within the housing assembly, the housing assembly comprising an upper end face, a thermal insulation structure and a substrate, the heat insulation structure is arranged between the substrate and the upper end face to separate the heat conduction of the substrate and the upper end face, the thermal switch main body comprises a temperature sensitive driver, a ratchet wheel and pawl mechanism, a driving column and a flexible heat conducting cable, the temperature sensitive driver is connected with the driving column through the ratchet wheel and pawl mechanism, the driving column is connected with the substrate through the flexible heat conducting cable, the driving column and the substrate are a moving pair, the temperature sensitive driver drives the driving column to reciprocate between a first position and a second position through a ratchet wheel and pawl mechanism, the first position is that the driving column is not in contact with the upper end face, and the second position is that the driving column is in contact with the upper end face.

2. The thermal switch of claim 1, wherein: the temperature sensitive driver is in thermally conductive connection with the substrate.

3. The thermal switch of claim 2, wherein: the temperature sensitive driver mainly comprises a bimetallic strip, a corrugated pipe or an elastic element filled with liquid, is sensitive to temperature, and can deform when the temperature changes so as to generate driving force.

4. The thermal switch of claim 1, wherein: the ratchet wheel and pawl mechanism comprises a ratchet wheel and a pawl, the ratchet wheel is connected with the temperature sensitive driver, and the pawl is connected with the driving column.

5. The thermal switch of claim 4, wherein: the pawl is perpendicular to the moving axis of the driving column, and the pawl is in sliding fit with the tooth surface of the ratchet wheel.

6. The thermal switch of claim 1, wherein: the substrate is mounted at a heat source end.

7. The thermal switch of claim 1, wherein: at least one flexible heat conducting cable is arranged, and the flexible heat conducting cables are mainly formed by laminating a plurality of layers of high-heat-conducting graphite films.

8. The thermal switch of claim 1, wherein: the base is provided with a guide groove, and the driving column is arranged in the guide groove.