A heat dissipation design method and structure for a space camera electrical stand-alone system

Abstract

The present invention relates to the field of spacecraft thermal control technology, and specifically provides a heat dissipation design method and structure for a space camera electric unit system. The electric units on the space camera are grouped according to the operating temperature and the operating mode, and the electric units in the same group are arranged on the same heat collecting plate. A compensation heating circuit is uniformly designed on each heat collecting plate to ensure that each electric unit on the heat collecting plate is always in the best working state. Compared with the heat dissipation of a single unit, it can greatly save thermal control resources such as temperature measurement circuits and heating circuits, and reduce the complexity of the thermal control system. A layered multi-channel heat pipe adapter block is designed to conduct heat between the heat pipe of the heat collecting plate and the heat pipe of the radiation heat dissipation plate, and a combined heat collecting plate and a layered multi-channel heat pipe adapter block are used to realize the heat dissipation design of a multi-electric unit system with different operating temperatures and different temperature control accuracy requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of spacecraft thermal control, and specifically provides a heat dissipation design method and structure for a space camera electrical stand-alone system. Background Art

[0002] With the development of space remote sensing technology, the requirements for the functions and performance of space cameras are getting higher and higher. The complexity of camera functions has led to an increase in the number of electrical units (i.e., electronic units) installed on the camera, which in turn has led to an increase in the power consumption of the unit and the total power consumption. Due to the strict restrictions on the size and weight of space cameras, the integration of single motor components and the power density of the unit have become higher. In order to better adapt to mission requirements, the working modes of space cameras, such as working conditions and working hours, are gradually no longer restricted. Working conditions need to be available at any time, and the working time requirements can be set arbitrarily. In addition, the diversity of camera functions allows each electrical unit to work asynchronously, and there is no fixed rule for the working time of each electrical unit, which leads to a great change in the thermal load of the camera during working and non-working periods. It is not easy to dissipate heat quickly and effectively during work, and high-power thermal compensation is required to ensure the storage temperature during non-working.

[0003] Resolution is the main performance indicator of space cameras, which is related to the camera aperture. The requirement for high resolution increases the size of the camera, which further increases the weight limit of large-aperture space cameras and the requirements for the rationality of the overall layout. Cables are used to connect the electrical units of space cameras and between the electrical units and the imaging focal plane of the camera. In order to reduce the length and weight of the cables, the electrical units are no longer installed separately in the satellite payload cabin, which is insulated and cooled by the satellite cabin. Instead, the electrical units related to the camera functions are installed on the main structure of the camera. In order not to affect the temperature of the main structure of the camera and the performance and reliability of the electrical units, they need to be thermally designed separately.

[0004] Due to the complex thermal environment of the space orbit, frequent changes in the satellite's in-orbit attitude, and limited non-sunlit effective heat dissipation surfaces, compared to the high-precision temperature control of the optical structure and focal plane components of space cameras, the operating temperature range of single electric machines is relatively wide. Therefore, it is necessary to design temperature-sensitive components such as the focal plane in the optimal heat dissipation position. However, single electric machine components are usually installed at a distance from the heat dissipation surface, and the heat consumption of high-power density single electric machines is difficult to dissipate quickly.

[0005] At present, for electric units with low power consumption and short-term operation, phase change materials are usually installed in the box to increase the heat capacity so that the operating temperature does not exceed the maximum acceptable temperature of the electric box. This method is limited by factors such as the power consumption, working time and working temperature range of the electric unit, and is not suitable for electric units with high power density and long-term operation. For electric units with high power density and long-term operation, heat is mainly transferred from the heat source to the mounting surface or side wall of the electric box by installing a heat conductive plate on the top or bottom of the electronic device, and the heat conductive plate is connected to the mounting surface or side wall of the electric box by heat conduction, and an external heat pipe is installed on the mounting surface or side wall of the electric box, which is connected to the radiation heat sink installed on the non-sun-exposed surface of the camera through the heat pipe. The efficient heat transfer capacity of the heat pipe is used to achieve rapid heat dissipation to the cold black space, but this design requires a large heat dissipation surface area, which will result in a large demand for heat compensation and high compensation power consumption during non-working periods.

[0006] For electric units that are far from the heat dissipation surface, heat transfer needs to be carried out through multiple heat pipes, and there are a large number of heat pipes and adapter blocks. When designing the heat dissipation of multiple electric units, it is necessary to consider thermal control resources such as the number of heat pipes, the number of compensation heating circuits, the number of temperature measurement circuits, the compensation power consumption and the weight of the whole machine, and also to consider the impact of gravity on the start-up of heat pipes when on the ground. These factors will make the arrangement of electric units, the direction of heat pipes, and the position of heat dissipation surfaces more complicated, which is not conducive to structural design, heat transfer of heat pipes and installation implementation.

[0007] Therefore, there is an urgent need for a heat dissipation design solution that can effectively manage the heat generated by high-power density, long-term working electrical units, effectively balance the heat dissipation requirements during working and the thermal compensation requirements during non-working periods, and ensure that the space camera system has high stability and reliability under various working conditions. Summary of the invention

[0008] In order to solve the above problems, the present invention provides a method and structure for heat dissipation design of a large-aperture space camera electric single-unit system. By classifying the electric single units on the space camera, the electric single units with similar operating temperature ranges and different operating modes are installed on the same heat collecting plate for unified temperature control, thereby reducing the demand for thermal control resources for independent heat dissipation design of each electric single unit. The combined heat collecting plate and layered heat pipe adapter design improve the compactness of the structure, effectively reduce the number of heat pipes and heat pipe adapter blocks in the multi-electric single-unit system, and reduce the overall weight of the space camera. The combined heat collecting plate and layered multi-channel heat pipe adapter block realize the overall arrangement design of the heat pipes, reducing the design complexity of the heat pipe startup that needs to be taken into account when arranging the heat pipes.

[0009] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0010] The heat dissipation design method of the space camera electric stand-alone system provided by the present invention comprises:

[0011] S1: grouping the electric units on the space camera according to the working temperature and working mode, so that the working temperature ranges of the electric units in the same group have an intersection, the width of the working temperature range of the electric units in the same group is within a preset range, and the same group includes both the electric units in the long-term working mode and the electric units in the short-term working mode;

[0012] S2: The same group of electric units are arranged on the same heat collecting plate, heat pipes are arranged on the heat collecting plate, and the heat pipes are used to dissipate heat from the heat collecting plate;

[0013] S3: A layered multi-channel heat pipe adapter block is designed according to the number of collector plates and the number of heat pipes connected to each collector plate. The layered multi-channel heat pipe adapter block includes multiple mounting layers. The heat pipes of the same collector plate are mounted in the same mounting layer. The mounting layer for connecting the heat pipes of two collector plates is the mounting layer for connecting the heat pipes of the radiant heat sink.

[0014] Preferably, in S2, the design number of heat pipes on each heat collecting plate is set according to the maximum heat dissipation power consumption requirement of each heat collecting plate and the thermal conductivity rate of a single heat pipe.

[0015] Preferably, a heat insulation plate is provided between the installation layers corresponding to different heat collecting plates on the layered multi-channel heat pipe adapter block.

[0016] Preferably, the heat source inside the electric unit is thermally connected to the installation surface of the electric box through a heat conducting plate, and the heat is dissipated through the installation surface of the electric box, and the installation surface of the electric box is connected to the front side of the heat collecting plate.

[0017] Preferably, a compensating heating circuit is provided on the side of the collector plate close to the heat pipe, and the compensating heating circuit performs temperature compensation on the collector plate according to the collector plate temperature measured by the temperature measuring element, so that the collector plate temperature is maintained within the intersection range of the operating temperature range of the powered unit.

[0018] A heat dissipation structure of a space camera electrical stand-alone system, comprising:

[0019] A first heat collecting plate, which is used to connect: an electric unit having an intersection of operating temperature intervals, a width of the operating temperature interval being greater than a preset threshold, and a heat pipe;

[0020] A second heat collecting plate, which is used to connect: an electric unit having an intersection of operating temperature intervals, a width of the operating temperature interval being less than a preset threshold, and a heat pipe;

[0021] Furthermore, the first heat collecting plate and the second heat collecting plate both include a single electric unit in a long-term working mode and a single electric unit in a short-term working mode;

[0022] A layered multi-channel heat pipe adapter block comprises, in sequence, a mounting layer for connecting heat pipes of a first heat collecting plate, a mounting layer for connecting heat pipes of a first radiation heat dissipation plate, a mounting layer for connecting heat pipes of a second heat collecting plate and a mounting layer for connecting heat pipes of a second radiation heat dissipation plate; the mounting layer for connecting heat pipes of the first heat collecting plate and the mounting layer for connecting heat pipes of the first radiation heat dissipation plate are thermally conductively connected; the mounting layer for connecting heat pipes of the second heat collecting plate and the mounting layer for connecting heat pipes of the second radiation heat dissipation plate are thermally conductively connected; the mounting layer for connecting heat pipes of the first radiation heat dissipation plate and the mounting layer for connecting heat pipes of the second heat collecting plate are thermally insulatedly connected.

[0023] Preferably, the first heat collecting plate and the second heat collecting plate are connected in a thermally insulated manner.

[0024] Preferably, the first heat collecting plate is vertically arranged on the second heat collecting plate.

[0025] Preferably, the mounting layer between the first heat collecting plate connected to the heat pipe and the mounting layer between the first radiation heat dissipation plate heat pipe is made of aluminum alloy material; the mounting layer between the first radiation heat dissipation plate heat pipe and the mounting layer between the second heat collecting plate connected to the heat pipe is made of polyimide material.

[0026] Preferably, a compensating heating circuit is provided on both the first heat collecting plate and the second heat collecting plate.

[0027] Compared with the prior art, the invention can achieve the following beneficial effects:

[0028] The present invention is suitable for the long-distance heat dissipation design of a high-power density electric unit system of a large-aperture space camera. Each electric unit is classified according to the operating temperature and the operating mode to ensure that the optimal operating temperature of the electric unit on each heat collecting plate and the requirement for temperature stability are relatively close. By designing only one compensating heating circuit on the heat collecting plate, synchronous temperature control of multiple electric units can be achieved, thereby avoiding the need for independently designing a thermal control system for each electric unit in the prior art, reducing the number of compensating heating circuits and temperature measuring circuits for the space camera, and saving thermal control resources. In addition, long-term working electric units and short-term working electric units are designed on each heat collecting plate. When the number of electric units working on the heat collecting plate is small, the on-orbit temperature of the space camera is lower than the minimum operating temperature. At this time, the heat generated by the long-term working electric unit during operation can provide a basic temperature for the heat collecting plate, thereby reducing the temperature compensation demand for the heat collecting plate and reducing the energy consumption of the compensating heating circuit.

[0029] In addition, during the classification of electric units, the power consumption of each electric unit can be comprehensively considered to balance the total power consumption of electric units on different collector plates.

[0030] Compared with the existing design of heat pipe transfer for long-distance heat dissipation of a single electric box, the present invention improves the compactness of the structure through the combined heat collecting plate and layered multi-channel heat pipe transfer design, effectively reduces the number of heat pipes and heat pipe transfer blocks in the multi-electric stand-alone system, and reduces the overall weight of the space camera. The combined heat collecting plate and layered multi-channel heat pipe transfer block can be used to centrally and neatly arrange the heat pipes in the multi-electric stand-alone system, avoiding the cross-disordered heat pipe directions.

[0031] The influence of factors such as gravity on the start-up of heat pipes on the complexity of heat pipe arrangement during ground tests is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0033] Figure 1 Schematic diagram of the heat dissipation structure of a space camera electrical stand-alone system provided according to an embodiment of the present invention.

[0034] Reference numerals include:

[0035] A first heat collecting plate 1, a second heat collecting plate 2, a pressing plate 3, a heat pipe 4, and a layered multi-channel heat pipe adapter block 5. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the invention clearer, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the invention and do not constitute a limitation to the invention. Similar components in different embodiments use associated similar component numbers. In the following embodiments, many detailed descriptions are to enable the invention to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other components, materials, and methods. In some cases, some operations related to the invention are not shown or described in the specification, in order to avoid the core part of the invention being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to form various implementation methods. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary sequence, unless otherwise specified that a certain sequence must be followed.

[0038] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, the meaning of "multiple" is two or more.

[0039] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0041] In one embodiment of the present invention, a heat dissipation design method for a space camera electric stand-alone system is provided, which is particularly suitable for long-distance heat dissipation of a high-power density electric stand-alone system. The specific design process is as follows:

[0042] S1: For a space camera, a plurality of electric units are arranged on its main structure. The heat source inside each electric unit is connected to the mounting surface of an electric box outside the electric unit through a heat conducting plate. The heat source inside the electric unit is conducted to the mounting surface of the electric box through the heat conducting plate, and the heat is dissipated through the mounting surface of the electric box.

[0043] In order to realize the centralized heat dissipation of each electric unit without affecting the working performance of each electric unit, in the embodiment of the present invention, multiple heat collecting panels are designed, and each electric unit is grouped. Each group of electric units is set on the same heat collecting panel, and the centralized heat dissipation of a group of electric units is realized through one heat collecting panel. Only one compensation heating circuit is designed at the cold end of each heat collecting panel (i.e., the local area on the heat collecting panel close to the heat pipe outlet) to realize the synchronous temperature control of multiple electric units, avoiding the need to independently design a thermal control system for each electric unit in the prior art, reducing the number of compensation heating circuits and temperature measurement circuits for the space camera, and saving thermal control resources. Specifically, the electric units are grouped according to the two dimensions of the working temperature and working mode of each electric unit. The purpose of grouping is to ensure that each electric unit on each heat collecting panel has a similar working temperature range and different working modes. The similar working temperature range can ensure that each electric unit on each heat collecting panel is in a better working temperature environment, and ensure that each electric unit has better working performance; different working modes can use the heat consumption of the electric unit in the long-term working mode to reduce the thermal compensation power consumption required by the entire heat collecting panel when the temperature is low. It can be understood that in the embodiment of the present invention, the electric units with intersecting working temperature ranges are divided into a group. The working temperature range means that the electric unit can work normally within the temperature range and has a good working effect. Under normal circumstances, the rated working temperature range can be directly referred to. In addition, the working temperature range of most electric units is relatively wide, and they can usually work normally within the range of -30℃~+50℃. However, some electric units involve imaging performance. Such electric units are limited by imaging quality and have high requirements for temperature stability and temperature rise. Usually, the working temperature is required to be no more than 15℃, or the temperature rise is less than 10℃. In order to further group the electric units with intersecting working temperature ranges, the electric units with low temperature requirements are designed on one heat collecting board, and the electric units with high temperature control accuracy requirements are designed on one heat collecting board. The embodiment of the present invention further limits the width of the working temperature range. The width of the working temperature range can directly reflect the sensitivity of the electric unit to temperature changes. A preset range can be set, and the electric units with intersecting working temperature ranges and the width of the working temperature range within the preset range are set as one group. Generally, when there are few electric units and no special temperature requirements, designing two collectors can meet the needs. Therefore, it is necessary to divide the electric units into two groups, corresponding to two preset intervals, which can be expressed as: and ,in, d is the preset threshold, usually set to 10. If the width of the operating temperature range is small, it is considered that the electric unit has high requirements for temperature rise and temperature stability; when the width of the operating temperature range of the electric unit is If the width of the operating temperature range is large, it is considered that the electric unit is not sensitive to temperature rise.

[0044] In addition, during the grouping process, it is necessary to ensure that each group includes both electric units in long-term working mode and electric units in short-term working mode. The electric units in long-term working mode can provide a basic temperature for all electric units on the entire collector through the heat generated during operation. It is understandable that when the number of electric units working on the collector is small, the on-orbit temperature of the space camera is lower than the minimum operating temperature. At this time, not only is heat dissipation not required, but temperature compensation is also required through a compensation heating circuit, especially for temperature-sensitive electric units. In this process, the electric units in long-term working mode can provide a basic temperature for all electric units on the entire collector, reducing the thermal compensation power consumption of the entire collector.

[0045] As a preferred embodiment, the power consumption of each electric unit can also be referred to in the grouping process. The power consumption of all electric units on each solar collector should be balanced. It is necessary to avoid concentrating electric units with long-term working mode and high power consumption on one solar collector, which will lead to difficulty in heat dissipation of the solar collector. In other words, it is necessary to avoid concentrating electric units with short-term working mode and low power consumption on one solar collector, which will lead to high thermal compensation requirements for the solar collector.

[0046] S2: After the electric units are grouped and designed, they need to be installed on the same collector. The installation principle is: the electric units with high power consumption are designed at the cold end of the collector (or the near end of the heat pipe). The cold end is the end of the collector connected to the heat pipe, which is used to transfer and dissipate the heat on the collector. Preferably, the electric units are sorted according to their power consumption, and they are installed in order from the cold end of the collector to the hot end of the collector (or the far end of the heat pipe).

[0047] For the concentrated heat on the heat collecting plate, the embodiment of the present invention adopts heat pipes for long-distance transmission. Specifically, multiple heat pipe installation holes are designed on the heat collecting plate, and the heat pipes are installed in the heat collecting plate. It should be noted that the outlet directions of the heat pipe installation holes on the heat collecting plate should be the same, so that the heat pipes can be arranged in an orderly manner. The design of the number of heat pipes needs to set the number of heat pipes on each heat collecting plate according to the maximum heat dissipation power consumption requirement of all electrical units on each heat collecting plate and the heat transfer capacity of a single heat pipe. It should be noted that the maximum heat dissipation power consumption requirement is not the sum of the power consumption of all electrical units on each heat collecting plate, but the maximum total power consumption of the electrical units working on the heat collecting plate during the working period, that is, there may be a situation where not all electrical units work at the same time during the entire working period, so the maximum heat dissipation power consumption requirement is not equal to the sum of the power consumption of all electrical units at this time.

[0048] In addition, since the electric units on each collector are grouped according to S1, the operating temperature of each collector may not be the same, so different collectors are connected in an insulating manner. Collectors with different operating temperatures are installed in an insulated manner, which reduces the temperature change caused by heat exchange between the collectors. The installation of electric units with high power consumption at the cold end of the collector is conducive to the rapid heat dissipation of high power density units. If there are collectors with the same operating temperature, the collectors with the same operating temperature can also be connected by heat conduction.

[0049] A compensating heating circuit needs to be set for each collector plate. The compensating heating circuit performs timely heating according to the temperature of the collector plate or the electric unit on the collector plate, so as to increase the temperature of the collector plate, so that each electric unit is under the best working temperature condition or ensures that the environment of each electric unit is evenly distributed below the minimum temperature it can adapt to, so as to avoid the temperature being too low on track, which affects the performance and service life of the device. Since the present invention concentrates multiple electric units on a collector plate for temperature control, it is only necessary to set a compensating heating circuit at the cold end of the collector plate. In the existing design, it is necessary to arrange a compensating heating circuit on each unit or collector plate. The present invention greatly reduces the design requirements of the compensating heating circuit. The compensating heating circuit can adopt a controllable heating plate, etc., which can be specifically set on the back of the collector plate (i.e., the non-electric unit installation surface) or the end surface of the collector plate where the heat pipe is installed.

[0050] The compensation heating circuit needs to make thermal compensation judgments based on the temperature of the solar collector. In the prior art, a temperature measuring element is usually designed and installed on each electrical unit. However, the embodiment of the present invention requires at least one temperature measuring element to be installed on each solar collector, thereby reducing the number of temperature measuring circuits and compensation circuits for the entire machine.

[0051] S3: In order to constrain the arrangement and routing of heat pipes and reduce the number of heat pipes and heat pipe adapter blocks used, it is also necessary to design a layered multi-channel heat pipe adapter block according to the number of heat collecting plates and the number of heat pipes connected to each heat collecting plate. The layered multi-channel heat pipe adapter block is composed of a plurality of parallel partitions and fillers constituting mounting holes between the parallel partitions. The partitions and the fillers constituting the mounting holes constitute a plurality of mounting layers, and each mounting layer is provided with a plurality of mounting holes for mounting heat pipes arranged in parallel. The heat pipes connected to the same heat collecting plate are installed in the same mounting layer, and the heat pipes connected to different heat collecting plates are arranged at intervals in different mounting layers. Specifically, a mounting layer for connecting heat pipes to a radiant heat dissipation plate is designed between the mounting layers for connecting heat pipes to two heat collecting plates. The heat on the heat collecting plate is transferred to the layered multi-channel heat pipe adapter block through the heat pipes connected thereto. The heat pipes connected to the heat collecting plate are connected to the heat pipes connected to the radiant heat dissipation plate through the layered multi-channel heat pipe adapter block, and then the heat is transferred to the radiant heat dissipation plate side for heat dissipation through the heat pipes connected to the radiant heat dissipation plate. Since the operating temperature ranges and temperature control accuracy between different collectors may be different, it is necessary to set a heat insulation board between the installation layers corresponding to the collectors with different operating temperature ranges and temperature control accuracy, that is, the partitions used to separate different collectors on the layered multi-channel heat pipe adapter block are made of insulation materials, and the heat pipes connected to the insulation boards with different operating temperature ranges and temperature control accuracy are insulated at the transfer position to avoid heat crosstalk between different collectors at the layered multi-channel heat pipe adapter block. In addition, if the operating temperature ranges and temperature control accuracy of the two collectors are almost the same, it is not necessary to set a heat insulation board for insulation.

[0052] Based on the above space camera electrical stand-alone system heat dissipation design method, please refer to Figure 1The embodiment of the present invention also provides a heat dissipation structure of a space camera electric stand-alone system, specifically comprising: a combined heat collecting plate, a heat pipe 4 and a layered multi-channel heat pipe adapter block 5. The combined heat collecting plate comprises a first heat collecting plate 1 and a second heat collecting plate 2. The first heat collecting plate 1 is mounted on the heat collecting plate 2. In order to improve the compactness and integration of the structure, the first heat collecting plate 1 can be vertically mounted on the second heat collecting plate 2, so that the first heat collecting plate 1 and the second heat collecting plate 2 can share the same layered multi-channel heat pipe adapter block 5. The first heat collecting plate 1 and the second heat collecting plate 2 are connected by heat insulation. The first heat collecting plate 1 and the second heat collecting plate 2 are both provided with mounting holes for the heat pipe 4, and a pressing plate 3 is reserved at the corresponding position of the mounting hole. The pressing plate 3 is coplanar with the heat collecting plate, and the heat pipe 4 is fixed in the mounting hole by the pressing plate 3. The heat pipe 4 is thermally connected to the first heat collecting plate 1 (the second heat collecting plate 2) and the pressing plate 3. The heat pipe 4 is a cylindrical structure with good thermal conductivity. According to the measured diameter sizes at both ends of the heat pipe 4, the mounting holes of the heat pipe 4 on the first heat collecting plate 1, the second heat collecting plate 2, and the layered multi-channel heat pipe adapter block 5 are processed with high precision so that the gap between the mounting hole and the heat pipe 4 is 0.1~0.2mm, which is used to fill the thermal conductive filler to reduce the contact thermal resistance without causing deformation or even damage to the heat pipe 4.

[0053] The electric units on the space camera are grouped according to the above-mentioned heat dissipation design method of the electric unit system of the space camera, and are fixed on the plane where the heat pipe 4 is installed. The combined heat collecting plate is installed on the main structure of the camera and is heat insulated from the main structure of the camera. Specifically, the electric units on the first heat collecting plate 1 meet the following conditions: the working temperature ranges of the electric units on it have an intersection, the width of the working temperature range is greater than the preset threshold, and it includes both the electric units in the long-term working mode and the electric units in the short-term working mode; the electric units on the second heat collecting plate 2 meet the following conditions: the working temperature ranges of the electric units on it have an intersection, the width of the working temperature range is less than the preset threshold, and it includes both the electric units in the long-term working mode and the electric units in the short-term working mode.

[0054] The heat pipes 4 installed on the first heat collecting plate 1 and the second heat collecting plate 2 are arranged on the same side and are integrated to extend in the same direction. The heat pipes 4 are used to transmit the heat of the large-aperture space camera high-power density electric single-machine system over a long distance. The heat pipes 4 installed on the first heat collecting plate 1 and the second heat collecting plate 2 are connected and heat-conducted with the heat pipes of the radiation heat dissipation plate through the layered multi-channel heat pipe adapter block 5. Specifically, the layered multi-channel heat pipe adapter block 5 adopts a layered structure to reduce the number of heat pipe adapter blocks in the multi-electric single-machine system, simplify the design and reduce the weight of the whole machine. The layered multi-channel heat pipe adapter block 5 includes 5 layers of parallel partition plates, and a layer of heat pipe mounting holes is formed between two adjacent layers of partition plates. The heat pipes 4 of the same heat collecting plate are uniformly installed in a layer of heat pipe mounting holes, and the heat pipes 4 of different heat collecting plates are installed in different layers of heat pipe mounting holes at intervals. Correspondingly, between the heat pipe mounting holes of the two layers of heat collecting plates is a layer of mounting holes for the adapter heat pipes on the side of the radiation heat dissipation plate. It can be understood that the layered multi-channel heat pipe adapter block includes, from top to bottom, the installation layer of the heat pipe 4 connected to the first heat collecting plate 1, the installation layer of the heat pipe of the first radiation heat sink, the installation layer of the heat pipe 4 connected to the second heat collecting plate 2, and the installation layer of the heat pipe of the second radiation heat sink. Between the installation layer of the heat pipe 4 connected to the first heat collecting plate 1 and the installation layer of the heat pipe of the first radiation heat sink, and between the installation layer of the heat pipe 4 connected to the second heat collecting plate 2 and the installation layer of the heat pipe of the second radiation heat sink, they are all made of aluminum alloy and other materials with good thermal conductivity; between the installation layer of the heat pipe of the first radiation heat sink and the installation layer of the heat pipe 4 connected to the second heat collecting plate 2 is an insulation plate made of insulation materials such as polyimide, which is used to isolate the heat exchange between the first heat collecting plate 1 and the second heat collecting plate 2 with different working temperatures on the heat dissipation path.

[0055] In addition, a compensating heating circuit is provided at one end of the first heat collecting plate 1 and the second heat collecting plate 2 close to the heat pipe 4 installed thereon, so as to perform temperature compensation on the electric units installed on the first heat collecting plate 1 and the second heat collecting plate 2 to prevent the temperature of the electric units thereon from being lower than the minimum operating temperature.

[0056] The heat dissipation design method and structure of the electric stand-alone system of the space camera provided in the embodiment of the present invention realizes the unified thermal control of multiple electric stand-als, reduces the number of compensation heating circuits and temperature measurement circuits of the entire electric stand-alone system, and saves thermal control resources. The combined heat collecting plate and the layered multi-channel heat pipe adapter block 5 realize the long-distance heat dissipation of the high-power density electric stand-alone system, improves the compactness of the structure, effectively reduces the number of heat pipes and heat pipe adapter blocks of the multi-electric stand-alone system, and reduces the weight of the whole space camera. In addition, the heat pipes 4 between the combined heat collecting plate and the layered multi-channel heat pipe adapter block 5 are arranged neatly and concentratedly, which is conducive to taking into account the design complexity of the ground test heat pipe startup, and can ensure that the space camera has good working performance. The heat dissipation structure designed and prepared according to the heat dissipation design method of the electric stand-alone system of the space camera of the present invention has been proven by on-orbit application. The actual operating temperature of each electric stand-alone is basically consistent with the design, which proves the feasibility of the present invention.

[0057] In short, the above description is only a preferred embodiment of this specification and is not intended to limit the protection scope of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

[0058] The systems, devices, modules or units described in one or more of the above embodiments may be implemented by a computer chip or entity, or by a product having a certain function. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0059] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0060] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0061] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A method for heat dissipation design of a space camera electrical stand-alone system, characterized in that: include: S1: grouping the electric units on the space camera according to the working temperature and working mode, so that the working temperature ranges of the electric units in the same group have an intersection, the width of the working temperature range of the electric units in the same group is within a preset range, and the same group includes both the electric units in the long-term working mode and the electric units in the short-term working mode; S2: The same group of electric units are arranged on the same heat collecting plate, heat pipes are arranged on the heat collecting plate, heat is dissipated by the heat pipes, and the heat collecting plate is installed on the main structure of the space camera; S3: Design a layered multi-channel heat pipe adapter block according to the number of collector plates and the number of heat pipes connected to each collector plate. The layered multi-channel heat pipe adapter block includes multiple mounting layers. Heat pipes of the same collector plate are mounted in the same mounting layer. The mounting layer for connecting heat pipes of two collector plates is the mounting layer for connecting heat pipes of radiant heat dissipation plates.

2. The method for heat dissipation design of a space camera electrical stand-alone system as claimed in claim 1, characterized in that: In S2, the design number of heat pipes on each heat collecting plate is set according to the maximum heat dissipation power consumption requirement of each heat collecting plate and the heat conductivity rate of a single heat pipe.

3. The method for heat dissipation design of a space camera electrical stand-alone system as claimed in claim 1, characterized in that: A heat insulation plate is provided between the installation layers corresponding to different heat collecting plates on the layered multi-channel heat pipe adapter block.

4. The method for heat dissipation design of a space camera electrical stand-alone system as claimed in claim 1, characterized in that: The heat source inside the electric unit is thermally connected to the installation surface of the electric box through the heat conduction plate, and the heat is dissipated through the installation surface of the electric box. The installation surface of the electric box is connected to the front side of the heat collecting plate.

5. The method for heat dissipation design of a space camera electrical stand-alone system as claimed in claim 4, characterized in that: A compensating heating circuit is arranged on the side of the collector plate close to the heat pipe. The compensating heating circuit performs temperature compensation on the collector plate according to the collector plate temperature measured by the temperature measuring element, so that the collector plate temperature is maintained within the intersection range of the operating temperature range of the powered unit.

6. A heat dissipation structure of a space camera electrical stand-alone system, characterized in that: include: A first heat collecting plate, which is used to connect: an electric unit having an intersection of operating temperature intervals, a width of the operating temperature interval being greater than a preset threshold, and a heat pipe; A second heat collecting plate, which is used to connect: an electric unit having an intersection of operating temperature intervals, a width of the operating temperature interval being smaller than the preset threshold, and a heat pipe; Furthermore, the first heat collecting plate and the second heat collecting plate both include a single electric unit in a long-term working mode and a single electric unit in a short-term working mode, and the first heat collecting plate is installed and the second heat collecting plate is installed on the main structure of the space camera; A layered multi-channel heat pipe adapter block, which sequentially includes a mounting layer for connecting the heat pipes of the first heat collecting plate, a mounting layer for connecting the heat pipes of the first radiation heat dissipation plate, a mounting layer for connecting the heat pipes of the second heat collecting plate, and a mounting layer for connecting the heat pipes of the second radiation heat dissipation plate; the mounting layer for connecting the heat pipes of the first heat collecting plate and the mounting layer for connecting the heat pipes of the first radiation heat dissipation plate are thermally conductively connected; the mounting layer for connecting the heat pipes of the second heat collecting plate and the mounting layer for connecting the heat pipes of the second radiation heat dissipation plate are thermally conductively connected; and the mounting layer for connecting the heat pipes of the first radiation heat dissipation plate and the mounting layer for connecting the heat pipes of the second heat collecting plate are thermally insulatedly connected.

7. The heat dissipation structure of the space camera electric stand-alone system as claimed in claim 6, characterized in that: The first heat collecting plate and the second heat collecting plate are thermally insulated and connected.

8. The heat dissipation structure of the space camera electric stand-alone system as claimed in claim 7, characterized in that: The first heat collecting plate is vertically arranged on the second heat collecting plate.

9. The heat dissipation structure of the space camera electric stand-alone system as claimed in claim 6, characterized in that: The mounting layer between the first heat collecting plate and the heat pipe is made of aluminum alloy; the mounting layer between the first heat collecting plate and the heat pipe is made of polyimide.

10. The heat dissipation structure of the space camera electric stand-alone system as claimed in claim 6, characterized in that: A compensating heating circuit is provided on both the first heat collecting plate and the second heat collecting plate.

Images