A space-grade multi-source high-capacity ultra-low vibration refrigerator device

Abstract

This invention discloses an aerospace-grade multi-source, high-capacity, ultra-low-vibration refrigerator device, relating to the field of refrigerators. It includes a refrigerator, a vibration isolation unlocking device, a vibration feedback sensor, an active vibration reduction control circuit, a heat collection plate, a flexible cold chain, a low-temperature heat pipe, and a low-leakage cold finger protection structure. The refrigerator is mounted on one side of the heat collection plate, thermally conductively integrated with it. The flexible heat pipe is installed on the other side of the heat collection plate to transfer heat from the refrigerator to the outside. The vibration feedback sensor is installed at the vibration source end of the refrigerator to monitor the vibration signal. The active vibration reduction control circuit is connected to multiple driving refrigerators and vibration feedback sensors. It collects vibration signals from the vibration feedback sensors and drives the opposing motors within each refrigerator to achieve active vibration reduction from multiple sources. This invention has a very high degree of integration, achieving active and passive vibration reduction, heat dissipation, temperature equalization, and cold capacity transfer within a limited space, and realizing mechanical isolation between high-vibration, high-heat components and high-precision loads.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to an aerospace-grade multi-vibration-source, high-capacity, ultra-low-vibration refrigeration device. Background Technology

[0002] Mechanical cooling technology is commonly used in optical remote sensing payloads to reduce background noise. However, aerospace-grade high-capacity refrigerators often generate significant vibrations, severely impacting image quality. In existing technologies, to ensure a small heat transfer temperature difference, the refrigerator is typically placed close to the imaging focal plane. This increases the difficulty of vibration suppression and heat dissipation, and the dispersed nature of the refrigerators makes layout challenging, resulting in long paths for heat dissipation and cryogenic links. Vibration suppression for refrigerators typically employs active and passive vibration absorption technologies, with vibration absorbers positioned at the compressor end or using partial vibration isolation within the compressor body. This approach has low integration, and a single vibration reduction method cannot cover the entire frequency band. Summary of the Invention

[0003] The purpose of this invention is to provide an aerospace-grade multi-source, high-capacity, ultra-low-vibration refrigerator device to solve the problems existing in the prior art. It enables active and passive vibration reduction, heat dissipation, temperature equalization, and cold energy transfer within a limited space, achieving mechanical isolation between high-vibration, high-heat components and high-precision loads, thus resolving the contradiction between high cold capacity and low vibration requirements in cryogenic optical remote sensing technology. The vibration isolation unlocking device integrates the locking device and the vibration isolator into one unit, reducing integration difficulty. Simultaneously, the locking device solves the problem of vibration isolators being unable to withstand large amplitude vibrations during launch. The active and passive vibration reduction achieved by the multi-source active vibration isolation device can work together to broaden the vibration reduction bandwidth and achieve full-band vibration suppression.

[0004] To achieve the above objectives, the present invention provides the following solution: an aerospace-grade multi-source, high-capacity, ultra-low vibration refrigeration and heat transfer device, comprising a refrigerator, a vibration isolation unlocking device, a vibration feedback sensor, a multi-source active vibration reduction control circuit, an integrated heat collection plate, a flexible cold chain, a low-temperature heat pipe, and a low-leakage cold finger protection structure; the refrigerator is installed on one side of the integrated heat collection plate, with complete thermal conductivity between them; the hot ends of the multiple flexible cold chains are installed on the other side of the integrated heat collection plate, transferring the heat generated by the refrigerator to the external heat dissipation plate for dissipation into space; the vibration feedback sensor is installed at the vibration source end of the refrigerator; the flexible cold chain is installed at the cold finger end of the refrigerator; the upper end of the vibration isolation unlocking device is connected to the integrated heat collection plate; the cold end of the low-temperature heat pipe is connected to the flexible cold chain; the multi-source active vibration reduction control circuit, by collecting data from the vibration feedback sensor, drives the opposed motor of the refrigerator to achieve active vibration suppression; and the low-leakage cold finger protection structure is installed on the outside of the cold finger of the refrigerator.

[0005] The present invention has the following beneficial effects:

[0006] The purpose of this invention is to provide an aerospace-grade multi-source, high-capacity, ultra-low-vibration refrigerator device to address the problems of existing technologies. It enables active and passive vibration reduction, heat dissipation, temperature equalization, and cold energy transfer within a limited space, achieving mechanical isolation between high-vibration, high-heat components and high-precision loads. This resolves the contradiction between the high cold capacity and low vibration requirements of cryogenic optical remote sensing technology. The vibration isolation unlocking device integrates the locking device and the vibration isolator into one unit, reducing integration difficulty. The locking device also solves the problem of vibration isolators being unable to withstand large amplitude vibrations during launch. Active and passive vibration reduction can serve as backups for each other, broadening the vibration reduction bandwidth and achieving full-band vibration suppression. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 A schematic diagram of the structure of the aerospace-grade multi-source large-capacity ultra-low vibration refrigeration unit provided by the present invention;

[0009] Figure 2 This is a schematic diagram of the flexible cold chain used in this invention;

[0010] Figure 3 A schematic diagram of the installation interfaces for the main chiller and vibration isolation unlocking components of the integrated solar collector;

[0011] Figure 4 A schematic diagram of the installation interface for the integrated heat collector plate, flexible heat pipe, and internal heat pipe.

[0012] Figure 5 This is a schematic diagram of a non-contact limiting protective cover for the cold finger of a refrigeration unit.

[0013] Figure 6 A schematic diagram of the low-leakage cold finger protection structure for a refrigeration unit;

[0014] Figure 7 This is a schematic diagram of the vibration isolation unlocking device;

[0015] Figure 8 A schematic diagram showing the location of the locking mechanism of the vibration isolation unlocking device;

[0016] Figure 9 This is a schematic diagram of a low-temperature heat pipe structure;

[0017] Figure 10 The block diagram of the multi-source active vibration reduction control circuit provided by the present invention.

[0018] Figure 11 The schematic diagram of the multi-source active vibration reduction control circuit algorithm provided by the present invention.

[0019] In the picture:

[0020] 1-Refrigeration unit, 2-Vibration isolation unlocking device, 3-Vibration feedback sensor, 4-Heat collector plate, 5-Flexible cold chain, 6-Low temperature heat pipe, 7-Low heat leakage cold finger protection structure, 8-Drive input port. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other. To achieve the above objectives, this invention adopts the following technical solution.

[0022] 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.

[0023] like Figure 1As shown, this embodiment provides an aerospace-grade multi-source, high-capacity, ultra-low vibration refrigerator device, including a refrigerator 1, a vibration isolation unlocking device 2, a vibration feedback sensor 3, a multi-source active vibration reduction control circuit, an integrated heat collection plate 4, a flexible cold chain 5, a low-temperature heat pipe 6, and a low-leakage cold finger protection structure 7. Multiple refrigerators 1 are installed on one side of the integrated heat collection plate 4, with complete thermal conductivity between them. One side 5-2 of the flexible cold chain is installed on one side of the cold finger 1-2 of the refrigerator, and the other side 5-1 is installed on one end 6-1 of the low-temperature heat pipe 6. The refrigerator 1 includes a compressor 1-1, a cold finger 1-2, and an air reservoir 1-3. The compressor 1-1 has a drive input port 8 at its end. The vibration feedback sensor 3 is installed at the end of the compressor 1-1 to monitor the vibration signal of the vibration source. The flexible cold chain 5 is installed at the end of the cold finger 1-2 of the refrigerator to transfer cold energy to the interior of the load and isolate vibration transmission. The cold end of the low-temperature heat pipe 6 is connected to the flexible cold chain 5, and the hot end of the low-temperature heat pipe 6 is connected to the device requiring cooling. The vibration isolation unlocking device 2 is connected to the integrated heat collection plate 4 at its upper end and to the external mounting base at its lower end. During the active launch phase, the vibration isolation unlocking device 2 is locked. Before the refrigerator 1 starts operating, the unlocking command is sent only through the vibration isolator 2-1 of the vibration isolation unlocking device 2. The low-heat leakage cold finger protection structure 7 is installed outside the refrigerator's cold finger 1-2 to protect it from vibration during launch. The multi-source active vibration reduction control circuit collects data from the vibration feedback sensor 3, performs analysis and calculation at the control core, and generates control signals. The output signal from the control drive module drives the opposing motor of the refrigerator 1 through the refrigerator's drive input port 8 to actively suppress vibration. The vibration feedback sensor 3 and the refrigerator's drive input port 8 are connected to the multi-source active vibration reduction control circuit. The flexible cold chain 5 is installed at the end of the refrigerator's cold finger 1-2, and the upper end of the vibration isolation unlocking device 2 is connected to the integrated heat collection plate 4. A locking mechanism is installed inside the vibration isolation unlocking device 2.

[0024] like Figure 3 , Figure 4 The integrated heat collection plate 4 shown is made of lightweight, high thermal conductivity, and high strength material. Internally, uniform heat pipes 4-6 are pre-embedded in the main heat transfer path, eliminating the need for reinforcing ribs and lightweight design in the heat-conducting areas. The main interfaces on one side of the refrigeration unit 1 include the refrigeration unit compressor mounting interface 4-2, the cold finger mounting interface 4-3, the air plenum mounting interface 4-4, and the vibration isolation unlocking device mounting interface 4-1. The main interface on the heat dissipation side is the flexible cold chain 5 hot end mounting interface 4-5.

[0025] The refrigeration unit 1 and the vibration isolation unlocking device 2 are installed on one side of the integrated heat collection plate 4. The heat dissipation surfaces of the compressor 1-1, cold finger 1-2, and air duct 1-3 are in good thermal contact with the heat collection plate 4. The refrigeration unit includes the compressor 1-1, cold finger 1-2, air duct 1-3, and drive input port 8. A flexible cold chain 5 is installed on the upper end of the cold finger 1-2, and the lower end of the cold finger 1-2 is installed on the integrated heat collection plate 4, ensuring thermal contact.

[0026] like Figure 2 As shown, the two ends 5-1 and 5-2 of the flexible cold chain 5 are rigid sections, and the middle section 5-3 is a flexible section. It can be made of a low-stiffness, high-thermal-conductivity material, preferably graphene cold chain material. A low-temperature heat pipe 6 or other high-efficiency heat transfer element is used to connect to the rear end of the flexible cold chain 5 to transfer cooling. The flexible cold chain 5 and the low-temperature heat pipe 6 can be combined into a flexible transmission link, using a flexible heat pipe or other heat transfer element.

[0027] The low-heat-leakage cold finger protection structure 7 can be configured as a non-contact limiting cold finger protection cover. The inner surface of the cover needs to be polished to reduce radiative heat leakage. Alternatively, a cup-shaped epoxy fiberglass thin-walled support structure can be selected to ensure the reliability of the cold finger through ultra-low heat leakage and high strength. Figure 5 , Figure 6 Two implementation forms of the low-heat-leakage cold finger protection structure are provided. The refrigeration unit uses a non-contact limiting cold finger protection cover 7-1, the inner surface of which needs to be polished to reduce radiative heat leakage. The cup-shaped epoxy fiberglass thin-walled support structure 7-2 ensures the reliability of the cold finger through ultra-low heat leakage and high strength.

[0028] According to such Figure 7 , Figure 8 The vibration isolation unlocking device 2 shown includes a base 2-2, a vibration isolator 2-1, an upper base 2-3, a limit switch 2-4, and a locking mechanism 2-5. The locking mechanism 2-5 is installed inside the base 2-2 and connects the base 2-2 and the upper base 2-3 via screws. When the upper base 2-3 is launched, the locking mechanism 2-5 locks, and the base 2-2 and the upper base 2-3 are in contact. Before the refrigerator 1 operates, the vibration isolation unlocking device unlocks, and the vibration isolation unlocking base 2-2 and the upper base 2-3 are separated by the vibration isolator 2-1, which serves as a vibration isolation device. Two vibration isolators 2-1 form a group, and the stiffness of the device in each direction can be adjusted according to the layout and design stiffness. The base 2-2, vibration isolator 2-1, upper base 2-3, limit switch 2-4, and locking mechanism 2-5 are integrated into one unit, and the stiffness of the device in each direction can be adjusted according to the layout and design stiffness.

[0029] like Figure 9 The low-temperature heat pipe 6 shown has its cold end 6-1 connected to one end 5-1 of the flexible cold chain, and its hot end 6-2 connected to the detector focal plane. The type of low-temperature heat pipe can be changed according to the actual temperature difference and heat transfer capacity requirements.

[0030] The active vibration reduction control circuit is directly connected to the drive input port 8 of multiple refrigerators 1 and the vibration feedback sensor 3. It includes three module functions: vibration acquisition, control core and drive output. The vibration acquisition unit realizes the acquisition of vibration signals at the end of each vibration source. The control core performs calculations on the acquired vibration signals and generates corresponding control signals to control the drive output module. The drive output module drives the opposing motor inside the corresponding vibration source refrigerator, which can play a role in active comprehensive suppression of multiple vibration sources.

[0031] Specifically, such as Figure 10 As shown, the active vibration reduction control circuit includes a vibration acquisition module, a control core module, and a drive output module. The vibration acquisition module collects vibration signals from the end of each vibration source. The control core module performs calculations on the collected vibration signals and generates corresponding control signals to control the drive output module. The drive output module drives the opposing motor inside the corresponding vibration source refrigerator. The multi-source active vibration isolation device collects data from the vibration feedback sensor 3, performs analysis and calculations in the control core module, and generates control signals. The drive module outputs drive signals through the refrigerator's drive input port 8 to drive the opposing motor of the refrigerator, thus achieving active vibration suppression.

[0032] Specifically, such as Figure 11 The active vibration damping control circuit shown consists of a microprocessor, external hardware circuitry, a compressor, and a vibration sensor. The microprocessor generates a PWM wave, acquires vibration signals, and outputs a signal y(n) based on a reference signal x(n) using an adaptive vibration damping algorithm. The PWM output from the microprocessor is filtered by an H-bridge and then used to control the compressor to ensure normal operation. The generated vibrations are acquired by the vibration sensor, amplified, filtered, and conditioned, and then returned to the microprocessor as an error signal e(n). Vibration damping is achieved by one of the motors. After the adaptive vibration damping algorithm, the desired damping signal is equal in magnitude but opposite in direction to the compressor's vibration signal, thus counteracting the original vibration of the refrigeration unit.

[0033] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An aerospace-grade multi-source, high-capacity, ultra-low-vibration refrigeration unit, characterized in that: The system includes a refrigerator, a vibration isolation unlocking device, a vibration feedback sensor, a multi-source active vibration reduction control circuit, an integrated heat collection plate, a flexible cold chain, a low-temperature heat pipe, and a low-leakage cold finger protection structure. The refrigerator is installed on one side of the integrated heat collection plate, with complete thermal conductivity between them. Multiple flexible cold chain hot ends are installed on the other side of the integrated heat collection plate, transferring the heat generated by the refrigerator to the external heat dissipation plate for dissipation into space. The vibration feedback sensor is installed at the vibration source end of the refrigerator, and the flexible cold chain is installed at the cold finger end of the refrigerator. The upper end of the vibration isolation unlocking device is connected to the integrated heat collection plate, and the cold end of the low-temperature heat pipe is connected to the flexible cold chain. The multi-source active vibration reduction control circuit actively suppresses vibration by collecting data from the vibration feedback sensor and driving the opposing motor of the refrigerator. The low-leakage cold finger protection structure is installed on the outside of the refrigerator's cold finger.

2. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 1, characterized in that: The heat collection plate is made of lightweight, high thermal conductivity, and high strength material. A uniform heat pipe is pre-embedded in the heat transfer path inside. The interface on the side of the heat collection plate where the refrigeration machine is installed includes the refrigeration machine compressor installation interface, the cold finger installation interface, the air storage installation interface, and the vibration isolation unlocking device installation interface. The interface on the heat dissipation surface of the heat collection plate is the flexible heat pipe hot end installation interface.

3. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 1, characterized in that: The refrigeration unit includes a compressor, a cold finger, an air storage compartment, and a drive input port. A flexible cold chain is installed on the upper end of the cold finger, and the lower end of the cold finger is installed on an integrated heat dissipation plate for heat conduction contact. An active vibration damping control circuit is connected to the drive input port of the refrigeration unit.

4. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 1, characterized in that: The low-heat-leakage cold finger protection structure adopts a non-contact limiting cold finger protection cover.

5. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 1, characterized in that: The low heat leakage cold finger protection structure adopts a cup-shaped epoxy fiberglass thin-walled support structure.

6. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 1, characterized in that: The vibration isolation unlocking device includes a base, a vibration isolator, an upper base, a limit switch, and a locking mechanism. The locking mechanism is installed inside the base and connects the base and the upper base with screws. When launching, the vibration isolation unlocking device locks, and the base and the upper base are in contact.

7. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 6, characterized in that: Before the refrigeration unit starts working, the vibration isolation unlocking device is unlocked, and the base and the upper base are separated by the vibration isolator, which plays a role in vibration isolation.

8. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 1, characterized in that: The flexible cold chain has fixed ends and a flexible section in the middle, and uses low-temperature heat pipes to connect to the rear end of the flexible cold chain to transmit cold energy.

9. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 1, characterized in that: The active vibration reduction control circuit includes a vibration acquisition module, a control core module, and a drive output module. The vibration acquisition module acquires vibration signals from the end of each vibration source. The control core module performs calculations on the acquired vibration signals and generates corresponding control signals to control the drive output module. The drive output module drives the opposing motor inside the corresponding vibration source refrigerator.

10. The aerospace-grade multi-source high-capacity ultra-low vibration refrigerator device according to claim 6, characterized in that: The vibration isolators are used in pairs.

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