Highly reliable cryogenic refrigerator micro-vibration insulation system

Abstract

The application relates to a high-reliability cryocooler micro-vibration insulation system and belongs to the technical field of satellites; a support Dewar is installed on the upper surface of a cold finger flange; a coupling substrate is placed on the top of the support Dewar; the top end of a support column is connected with the coupling substrate, and the bottom end is connected with the cold finger flange; a pyrotechnic cutter and a conductive sensor are arranged on the support column; a detector Dewar cover is installed on the coupling substrate; a splicing substrate is installed on the coupling substrate; a detector device is installed on the splicing substrate; a cryocooler cold head extends into the inner cavity of the support Dewar from the bottom of the cold finger flange; a flexible cold chain is arranged on the top of the cryocooler cold head and is connected with the coupling substrate; a vacuum pump is in communication with the detector Dewar; a water cooler is in communication with the cold finger flange; the application can not only guarantee that the launch section effectively supports the detector assembly but also guarantee that the support end and the detector assembly are physically isolated during the in-orbit period, so that the micro-vibration generated by the cryocooler during in-orbit work is insulated from the detector.

Description

Technical Field

[0001] This invention belongs to the field of satellite technology and relates to a highly reliable micro-vibration insulation system for a refrigerator. Background Technology

[0002] With the development of space infrared remote sensing applications, the demand for large-scale, high-resolution cooled infrared detectors is becoming increasingly widespread. One characteristic is their large array size and geometric dimensions, which increases the cooling capacity required by the refrigerator. Currently, cooled infrared detector assemblies mainly consist of spliced ​​detector components coupled to the refrigerator's cold head via a flexible cold chain. This flexible cold chain transfers the cooling capacity of the refrigerator's cold head to the back of the detector assembly. The refrigerator typically consists of a cold head and a compressor. Both the cold head and the compressor generate micro-vibrations during the cooling process and gas compression, respectively. If these micro-vibrations are not controlled within an effective range, they will directly affect the detector's imaging quality. Previously, cooled detector assemblies were assembled by directly fixing the detector coupling substrate to the coupling flange of the refrigerator's cold head. To ensure the mechanical requirements of the detector assembly during rocket launch, the entire assembly was rigidly connected. However, during the on-orbit imaging phase of the remote sensing camera, the micro-vibrations generated by the refrigerator itself are directly transmitted to the detector components through the rigid support, affecting the imaging quality. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a highly reliable micro-vibration insulation system for a cryo-machine. This system can ensure that the transmitting section effectively supports the detector assembly and also ensures that the support end is physically isolated from the detector assembly during on-orbit operation. This ensures that the micro-vibrations generated by the cryo-machine during on-orbit operation are insulated from the detector, thus significantly improving the reliability of the entire assembly.

[0004] The solution of the present invention is:

[0005] A highly reliable micro-vibration insulation system for a refrigerator includes a detector Dewar, a detector device, a splicing substrate, a coupling substrate, a flame cutter, a conductive sensor, a support column, a cold finger flange, a refrigerator connecting pipe, a compressor, a flexible cold chain, a support Dewar, a refrigerator cold head, a vacuum pump, and a water chiller.

[0006] The components are as follows: a cold finger flange is placed horizontally; a support Dewar is installed on the upper surface of the cold finger flange; a coupling substrate is placed horizontally on top of the support Dewar; a support column is located inside the support Dewar, with its top end connected to the coupling substrate and its bottom end connected to the cold finger flange; a pyrotechnic cutter and a conductive sensor are mounted on the support column; a detector Dewar cover is mounted on the upper surface of the coupling substrate; a splicing substrate is installed on the upper surface of the coupling substrate and located inside the detector Dewar; detector devices are mounted on the upper surface of the splicing substrate; the head of the chiller cold head extends from the bottom of the cold finger flange into the inner cavity of the support Dewar; a flexible cold chain is located on top of the chiller cold head, with its top connected to the coupling substrate; one end of the chiller connecting pipe is connected to the tail end of the chiller cold head, and the other end of the chiller connecting pipe is connected to the compressor; a vacuum pump is connected to the detector Dewar; and a water chiller is connected to the cold finger flange.

[0007] In the aforementioned high-reliability micro-vibration insulation system for a refrigerator, the detector device is bonded to the splicing substrate; the splicing substrate is bonded to the coupling substrate; and the bottom of the detector Dewar is screwed and sealed to the coupling substrate.

[0008] In the aforementioned high-reliability micro-vibration insulation system for a refrigerator, the top end of the flexible cold chain is screwed to the coupling substrate, and the bottom end of the flexible cold chain is screwed to the cold head of the refrigerator, thereby achieving thermal conductivity between the refrigeration system and the detector device.

[0009] In the aforementioned high-reliability micro-vibration insulation system for a refrigerator, a support column is used to support the coupling substrate during the launch phase.

[0010] In the aforementioned high-reliability micro-vibration insulation system for a refrigeration unit, the working process of the micro-vibration insulation system is divided into three stages: the ground testing stage, the pre-launch stage, and the orbit insertion stage.

[0011] In the aforementioned high-reliability micro-vibration insulation system for a refrigeration unit, the operation process of the micro-vibration insulation system during the ground testing phase is as follows:

[0012] The support Dewar is installed between the coupling substrate and the cold finger flange, serving as an auxiliary support for the ground and providing the necessary vacuum conditions for ground cooling of the detector. A vacuum pump is used to evacuate the detector Dewar connection to provide the vacuum conditions required for ground cooling testing. The water chiller is connected to the cold finger flange of the chiller to dissipate heat from the chiller's cold head. The compressor is powered on, and the temperature of the detector device is adjusted through the chiller connecting pipes and the chiller's cold head. When the detector device reaches the predetermined operating temperature, the functional and performance tests of the detector's ground status can be performed.

[0013] In the aforementioned high-reliability micro-vibration insulation system for a refrigerator, the operation process of the micro-vibration insulation system during the pre-launch stage is as follows:

[0014] Remove the support Dewar. At this point, the coupling substrate is connected to the cold finger flange via a support column; the coupling substrate is connected to the refrigeration unit cold head via a flexible cold chain.

[0015] In the aforementioned high-reliability micro-vibration insulation system for a refrigeration unit, the operation process of the micro-vibration insulation system during the track insertion phase is as follows:

[0016] When the pyrotechnic cutter is powered on, it cuts the support column; at this time, the connection relationship of the micro-vibration insulation system is only that the coupling substrate and the cold head of the refrigerator are connected by a flexible cold chain, so as to achieve effective insulation of the transmission of micro-vibration of the refrigerator.

[0017] In the aforementioned high-reliability micro-vibration insulation system for a refrigeration unit, the conductive sensor is used to monitor whether the support column is cut by a pyrotechnic cutter.

[0018] In the aforementioned high-reliability micro-vibration insulation system for a refrigeration unit, the conductive sensor is energized when the support column is not cut off, and de-energized when the support column is cut off.

[0019] The advantages of this invention compared to the prior art are:

[0020] (1) The present invention can realize remote control of micro-vibration insulation when the cooled detector assembly is working on the track, thereby improving the on-track imaging quality of the detector.

[0021] (2) The present invention simultaneously meets the power-up requirements of the detector under normal temperature and pressure environment on the ground and under vacuum environment in orbit, and is simple to operate, improving the reliability of the detector components.

[0022] (3) The present invention adjusts the temperature of the detector device by means of the chiller connecting pipe, compressor and chiller cold head, while cooling the chiller cold head by means of water chiller and cold finger flange, thereby improving the heat dissipation capacity of the system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the ground testing phase of the micro-vibration insulation system of the present invention;

[0024] Figure 2 This is a schematic diagram of the track insertion stage of the micro-vibration insulation system of the present invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the embodiments.

[0026] This invention provides a highly reliable micro-vibration insulation system for a cryostat, which can ensure that the transmitting section effectively supports the detector assembly and also ensure physical isolation between the support end and the detector assembly during on-orbit operation. This ensures that the micro-vibrations generated by the cryostat during on-orbit operation are insulated from the detector, significantly improving the reliability of the entire assembly.

[0027] High-reliability refrigeration unit micro-vibration insulation system, such as Figure 1 As shown, it specifically includes detector Dewar 1, detector device 2, splicing substrate 3, coupling substrate 4, flame cutter 5, conductive sensor 6, support column 7, cold finger flange 8, refrigeration unit connecting pipe 9, compressor 10, flexible cold chain 11, support Dewar 12, refrigeration unit cold head 13, vacuum pump 14, and water chiller 15.

[0028] The components are as follows: a cold-finger flange 8 is placed horizontally; a support dewar 12 is installed on the upper surface of the cold-finger flange 8; a coupling substrate 4 is placed horizontally on top of the support dewar 12; a support column 7 is located inside the support dewar 12, with its top end connected to the coupling substrate 4 and its bottom end connected to the cold-finger flange 8; a pyrotechnic cutter 5 and a conductive sensor 6 are mounted on the support column 7; a detector dewar 1 is mounted on the upper surface of the coupling substrate 4; and a splicing substrate 3 is installed on the upper surface of the coupling substrate 4 and located at the detector... Inside the Dewar 1; the detector device 2 is mounted on the upper surface of the splicing substrate 3; the head end of the refrigerator cold head 13 extends from the bottom of the cold finger flange 8 into the inner cavity supporting the Dewar 12; the flexible cold chain 11 is set on the top of the refrigerator cold head 13, and the top of the flexible cold chain 11 is connected to the coupling substrate 4; one end of the refrigerator connecting pipe 9 is connected to the tail end of the refrigerator cold head 13, and the other end of the refrigerator connecting pipe 9 is connected to the compressor 10; the vacuum pump 14 is connected to the detector Dewar 1; the water chiller 15 is connected to the cold finger flange 8.

[0029] Among them, the detector device 2 is bonded to the splicing substrate 3; the splicing substrate 3 is bonded to the coupling substrate 4; and the bottom end of the detector Dewar 1 is screwed and sealed to the coupling substrate 4.

[0030] The top end of the flexible cold chain 11 is screwed to the coupling substrate 4, and the bottom end of the flexible cold chain 11 is screwed to the cold head 13 of the refrigeration unit, thereby realizing thermal conductivity between the refrigeration system and the detector device 2.

[0031] The present invention uses support columns 7 to support the coupling substrate 4 during the launch phase.

[0032] The operation of the micro-vibration insulation system is divided into three stages: the ground testing stage, the pre-launch stage, and the orbit insertion stage.

[0033] like Figure 1 As shown, the working process of the micro-vibration insulation system during the ground testing phase is as follows:

[0034] The support Dewar 12 is installed between the coupling substrate 4 and the cold finger flange 8, which serves as an auxiliary support for the ground and also provides the necessary vacuum conditions for ground cooling of the detector. The detector Dewar 1 is connected to the vacuum pump 14 to perform vacuum treatment, providing the vacuum conditions required for ground cooling test. The water chiller 15 is connected to the cold finger flange 8 of the chiller to dissipate heat from the chiller cold head 13. The compressor 10 is powered on, and the temperature of the detector device 2 is adjusted through the chiller connecting pipe 9 and the chiller cold head 13. When the detector device 2 reaches the predetermined operating temperature, the functional and performance tests of the detector ground status can be performed.

[0035] like Figure 2 As shown, the working process of the micro-vibration insulation system in the pre-launch stage is as follows:

[0036] Remove the support Dewar 12. At this time, the coupling substrate 4 is connected to the cold finger flange 8 through the support column 7; the coupling substrate 4 is connected to the refrigeration unit cold head 13 through the flexible cold chain 11.

[0037] like Figure 2 As shown, the working process of the micro-vibration insulation system during the track insertion phase is as follows:

[0038] When the pyrotechnic cutter 5 is powered on, it cuts the support column 7. At this time, the connection relationship of the micro-vibration insulation system is only that the coupling substrate 4 and the cold head 13 of the refrigerator are connected by the flexible cold chain 11, so as to achieve effective insulation of the transmission of micro-vibration of the refrigerator.

[0039] The conductive sensor 6 is used to monitor whether the support column 7 has been cut by the pyrotechnic cutter 5. When the support column 7 has not been cut, the conductive sensor 6 is energized; when the support column 7 has been cut, the conductive sensor 6 is de-energized.

[0040] Example

[0041] In this embodiment, the detector Dewar assembly is a spliced ​​infrared detector Dewar assembly. During ground testing, the coupling substrate 4 of this assembly is rigidly connected to the rear optical system of the infrared camera. Simultaneously, the detector Dewar 1, detector device 2, splicing substrate 3, and coupling substrate 4 also maintain a rigid connection. The back of the coupling substrate 4 is rigidly connected sequentially to the supporting Dewar 12, four insulating support columns distributed circumferentially along the axial direction of the chiller cold head 13, and one end of the flexible cold chain 11. The cold finger flange 8 is rigidly connected to the supporting Dewar 12 and the insulating support columns. The back of the cold finger flange 8 is connected to the infrared camera floor via a vibration absorber. The rear optical system of the infrared camera is rigidly connected to the camera base plate. The vacuum pump 14 is connected to the detector Dewar 1, and the water chiller 15 is connected to the cold finger flange 8 of the chiller to establish the ground testing state.

[0042] When entering launch mode, there is no need to maintain ground vacuum and heat dissipation; that is, the Dewar 12 support is removed, and ground testing equipment such as the vacuum pump 14 and water cooler 15 are taken out. At this time, the four insulating support columns can still provide support and ensure the mechanical performance requirements of the detector components.

[0043] When the satellite successfully enters orbit, the controller activates the pyrotechnic cutter 5 on the insulating support column, disconnecting the insulating support column, and the conductivity sensor 6 indicates that it is disconnected. At this time, the component status is as follows: Figure 2 As shown, the detector assembly and the refrigerator are connected only by a flexible cold chain 11, with no rigid connection between them. This achieves effective insulation against micro-vibrations of the refrigerator.

[0044] This invention enables remote control of micro-vibration insulation for cooled detector components during on-orbit operation, thereby improving the on-orbit imaging quality of the detector.

[0045] This invention simultaneously meets the power-up requirements of the detector under both normal temperature and pressure conditions on the ground and under vacuum conditions in orbit, and is simple to operate, improving the reliability of the detector components.

[0046] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A highly reliable micro-vibration insulation system for a refrigeration unit, characterized in that: It includes detector Dewar (1), detector device (2), splicing substrate (3), coupling substrate (4), fire cutter (5), conductive sensor (6), support column (7), cold finger flange (8), refrigeration unit connecting pipe (9), compressor (10), flexible cold chain (11), support Dewar (12), refrigeration unit cold head (13), vacuum pump (14) and water chiller (15). The cold finger flange (8) is placed horizontally; the support dewar (12) is installed on the upper surface of the cold finger flange (8); the coupling substrate (4) is placed horizontally on top of the support dewar (12); the support column (7) is set in the inner cavity of the support dewar (12), and the top end of the support column (7) is connected to the coupling substrate (4), and the bottom end of the support column (7) is connected to the cold finger flange (8); the pyrotechnic cutter (5) and the conductive sensor (6) are set on the support column (7); the detector dewar (1) is covered on the upper surface of the coupling substrate (4); the splicing substrate (3) is installed on the upper surface of the coupling substrate (4) and is located on the detector. Inside the Dewar (1) cavity; the detector device (2) is mounted on the upper surface of the splicing substrate (3); the head of the refrigerator cold head (13) extends from the bottom of the cold finger flange (8) into the cavity supporting the Dewar (12); the flexible cold chain (11) is set on the top of the refrigerator cold head (13), and the top of the flexible cold chain (11) is connected to the coupling substrate (4); one end of the refrigerator connecting pipe (9) is connected to the tail end of the refrigerator cold head (13), and the other end of the refrigerator connecting pipe (9) is connected to the compressor (10); the vacuum pump (14) is connected to the detector Dewar (1); the water chiller (15) is connected to the cold finger flange (8); The operation of the micro-vibration insulation system is divided into three stages: the ground testing stage, the pre-launch stage, and the orbit insertion stage. The working process of the micro-vibration insulation system during the ground testing phase is as follows: The support Dewar (12) is installed between the coupling substrate (4) and the cold finger flange (8) to provide ground auxiliary support and also to provide the necessary vacuum conditions for ground cooling of the detector. The detector Dewar (1) is connected to the vacuum pump (14) for vacuuming to provide the vacuum conditions required for ground cooling test. The water chiller (15) is connected to the cold finger flange (8) of the chiller to dissipate heat from the chiller cold head (13). The compressor (10) is powered on and the temperature of the detector device (2) is adjusted through the chiller connecting pipe (9) and the chiller cold head (13). When the detector device (2) reaches the predetermined working temperature, the functional and performance tests of the detector ground status can be performed. The working process of the micro-vibration insulation system in the pre-launch phase is as follows: Remove the support Dewar (12). At this time, the coupling substrate (4) is connected to the cold finger flange (8) through the support column (7); the coupling substrate (4) is connected to the refrigeration unit cold head (13) through the flexible cold chain (11). The working process of the micro-vibration insulation system during the orbit insertion phase is as follows: When the pyrotechnic cutter (5) is powered on, the pyrotechnic cutter (5) cuts the support column (7); at this time, the connection relationship of the micro-vibration insulation system is only that the coupling substrate (4) and the cold head (13) of the refrigerator are connected by a flexible cold chain (11) to achieve effective insulation of the micro-vibration transmission of the refrigerator.

2. The high-reliability micro-vibration insulation system for a refrigeration unit according to claim 1, characterized in that: The detector device (2) is bonded to the splicing substrate (3); the splicing substrate (3) is bonded to the coupling substrate (4); the bottom of the detector Dewar (1) is screwed to the coupling substrate (4) for sealing.

3. The high-reliability micro-vibration insulation system for a refrigeration unit according to claim 1, characterized in that: The top end of the flexible cold chain (11) is screwed to the coupling substrate (4), and the bottom end of the flexible cold chain (11) is screwed to the cold head (13) of the refrigerator, so as to realize the thermal conduction between the refrigeration system and the detector device (2).

4. The high-reliability micro-vibration insulation system for a refrigeration unit according to claim 1, characterized in that: The support column (7) provides support for the coupling substrate (4) during the launch phase.

5. The high-reliability micro-vibration insulation system for a refrigeration unit according to claim 1, characterized in that: The conductive sensor (6) is used to monitor whether the support column (7) is cut by the pyrotechnic cutter (5).

6. The high-reliability micro-vibration insulation system for a refrigeration unit according to claim 5, characterized in that: When the support column (7) is not cut off, the conductive sensor (6) is energized; when the support column (7) is cut off, the conductive sensor (6) is de-energized.

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