Refrigerator

Abstract

The application provides a refrigerating machine, which comprises a shell, a compression unit, an expansion unit and a damping unit, the shell has a cavity, the compression unit and the damping unit are located in the cavity, the compression unit is connected with the shell, the expansion unit is partially located in the cavity and is in communication with the compression unit. The damping unit is sleeved on the compression unit, the damping unit is partially located in the compression unit, and the damping unit is used for damping the compression unit. The refrigerating machine has a compact structure, and the size and mass of the refrigerating machine are small.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and more particularly to a refrigeration machine. Background Technology

[0002] Miniature cryogenic refrigerators are mainly used to cool cryogenic optoelectronic or superconducting electronic devices to around -200°C to maintain the necessary low-temperature working environment for their normal operation. They are an indispensable core device for infrared detection systems and superconducting cryogenic electronic systems.

[0003] Currently, the mainstream technology used in infrared detection is the miniature linear compressor Stirling refrigerator system. One end of the compressor in this system is connected to an expander, and the combined action of the compressor and expander achieves a refrigeration cycle of compression, heat release, expansion, and heat absorption. A vibration damper is installed at the other end of the compressor to eliminate vibrations from the miniature linear compressor Stirling refrigerator.

[0004] However, the addition of vibration dampers at the ends results in a larger structural size for the micro cryogenic refrigerator, which is not conducive to its miniaturization. Summary of the Invention

[0005] This application provides a refrigeration machine with a relatively compact structure.

[0006] The refrigeration unit provided in this application includes a housing, a compression unit, an expansion unit, and a vibration damping unit. The housing has a cavity, the compression unit and the vibration damping unit are located in the cavity, the compression unit is connected to the housing, and the expansion unit is partially located in the cavity and communicates with the compression unit.

[0007] The vibration damping unit is mounted on the compression unit, with part of the vibration damping unit located inside the compression unit. The vibration damping unit is used to reduce vibration for the entire refrigeration unit.

[0008] In one possible implementation, the refrigeration unit provided in this application is coaxially arranged with the vibration damping unit and the compression unit. The compression unit includes a first stator and a first coil located inside the first stator. The vibration damping unit includes a second coil located inside the first stator and outside the first coil.

[0009] In one possible implementation, the refrigeration unit provided in this application further includes an isolation cylinder, a cylinder, and a first mover. The first stator is sleeved on the isolation cylinder. The first end of the isolation cylinder in the extending direction abuts against the inner wall of the first end of the housing, and the second end of the isolation cylinder in the extending direction abuts against the inner wall of the second end of the housing, so as to divide the cavity into a first chamber and a second chamber, with the first chamber surrounding the periphery of the second chamber.

[0010] The first stator, the first coil, and the vibration damping unit are located in the first chamber, and the cylinder and the first mover are located in the second chamber. The first mover includes a piston and a first magnet. The piston includes a first insertion part and a connecting part connected to the first insertion part. The first insertion part is located inside the cylinder and reciprocates along the axial direction of the cylinder. The connecting part is located outside the cylinder, and the first magnet is sleeved on the connecting part.

[0011] In one possible implementation, the refrigeration unit provided in this application further includes a second stator, which is sleeved on the cylinder and located between the cylinder and the first magnet. The cylinder is connected to the inner wall of the housing.

[0012] In one possible implementation, the refrigeration unit provided in this application further includes a second mover, which includes a second mover body and a second magnet. The second mover body is sleeved on the first stator, and the second magnet is located inside the second mover body. Both ends of the first stator are connected to leaf springs, which are connected by a first connector, and / or the leaf springs are connected to the housing by the first connector.

[0013] In one possible implementation, the refrigeration unit provided in this application also includes a circuit board, which is sleeved on the first end of the isolation cylinder. The isolation cylinder is located between the circuit board and the expansion unit. The compression unit and the vibration damping unit are both electrically connected to the circuit board. The circuit board is provided with an output interface, which is located outside the housing.

[0014] In one possible implementation, the refrigeration unit provided in this application further includes two leaf springs and a first connecting member. The two leaf springs are provided with through holes, and the first connecting member is connected to the leaf springs through the through holes.

[0015] The circuit board has at least one connection hole, and a first connector is provided in a one-to-one correspondence with the connection hole. The end of the first connector facing the circuit board has a threaded hole, and a second connector passes through the housing and the connection hole in sequence and connects to the threaded hole.

[0016] In one possible implementation, the refrigerator provided in this application has a housing including a body and a cover on the body. The cover has a mounting hole that communicates with a cylinder, and an airflow channel is formed between the mounting hole and the cylinder. An expansion unit is mounted on the mounting hole and is coaxially arranged with the cylinder.

[0017] In one possible implementation, the refrigeration unit provided in this application includes a housing and an exhaust device. The housing is partially inserted into a mounting hole and has a receiving cavity inside. The extending direction of the receiving cavity is consistent with the axial direction of the cylinder. The receiving cavity is connected to the airflow channel. The exhaust device is located inside the receiving cavity and reciprocates along the extending direction of the receiving cavity.

[0018] In one possible implementation, the refrigerator provided in this application has a housing comprising a second insertion part, an abutment part, and an extension part connected in sequence. The receiving cavity extends from the second insertion part and the abutment part to the extension part in sequence. The second insertion part is inserted into the mounting hole, the abutment part abuts against the outer surface of the housing cover, the first end of the discharge device is located in the airflow channel, the first end of the discharge device is connected to the end of the second insertion part by an elastic member, and the second end of the discharge device is located in the receiving cavity corresponding to the extension part.

[0019] The refrigerator provided in this application comprises a housing, a compression unit, an expansion unit, and a vibration damping unit. The housing has a cavity within it, and the compression unit and vibration damping unit are located within the cavity. The compression unit is connected to the housing, and the expansion unit is partially located within the cavity and communicates with the compression unit. The vibration damping unit is fitted onto the compression unit, with a portion of the damping unit located within the compression unit. The vibration damping unit is used to dampen vibrations in the entire refrigerator. By placing the vibration damping unit within the housing, and by sharing some structure and magnetic circuitry with the compression unit, the refrigerator's structure becomes more compact, its size smaller, and its weight lighter, which is beneficial for miniaturization and weight reduction. The vibration damping unit employs active vibration damping technology, which can eliminate or reduce high-frequency vibrations generated by the compression and expansion units, resulting in better vibration damping performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the refrigeration unit provided in the embodiments of this application;

[0022] Figure 2 A schematic diagram of the rear structure of the refrigerator provided in an embodiment of this application;

[0023] Figure 3 for Figure 1 AA section view in the middle;

[0024] Figure 4 for Figure 3 A magnified view of a section at point B in the middle.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100 - Housing;

[0027] 110 - Cavity; 111 - First chamber; 112 - Second chamber; 120 - Shell; 130 - Shell cover; 131 - Mounting hole;

[0028] 200-expansion unit;

[0029] 210 - Outer shell; 211 - Receiving cavity; 212 - Second insertion part; 213 - Abutting part; 214 - Extension part; 220 - Discharge device; 230 - Elastic element;

[0030] 300-compression unit;

[0031] 310-First stator; 311-Annular groove; 320-First coil; 330-Isolation cylinder; 340-Cylinder; 350-First mover; 351-Piston; 352-First magnet; 360-Second stator; 3511-First insertion part; 3512-Connecting part;

[0032] 400-Vibration damping unit;

[0033] 410 - Second coil; 420 - Second mover; 430 - Leaf spring; 421 - Second mover body; 422 - Second magnet; 431 - First leaf spring; 432 - Second leaf spring; 440 - First connector; 441 - Nut; 442 - Threaded hole; 443 - Second connector;

[0034] 500 - Circuit Board;

[0035] 510 - Output interface; 520 - Flexible flat cable; 530 - Connection hole. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0040] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or display that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or display.

[0041] Miniature cryogenic refrigerators are primarily used to cool cryogenic optoelectronic or superconducting electronic devices to around -200°C, maintaining the necessary low-temperature operating environment for their normal operation. They are indispensable core components of infrared detection systems and superconducting cryogenic electronic systems. Stirling refrigerators offer advantages such as high efficiency, rapid cooling, small size, light weight, low power consumption, and high reliability, making them widely used in infrared detectors and cryogenic superconducting fields.

[0042] Currently, the mainstream technology used in infrared detection is the miniature linear compressor Stirling refrigerator system. One end of the compressor in this system is connected to an expander, and the combined action of the compressor and expander achieves a refrigeration cycle of compression, heat release, expansion, and heat absorption. A vibration damper is installed at the other end of the compressor to eliminate vibrations from the miniature linear compressor Stirling refrigerator.

[0043] However, the addition of vibration dampers at the ends results in a larger structural size and mass for the miniature linear compressor Stirling refrigerator, which is detrimental to its miniaturization and weight reduction. Furthermore, vibration dampers typically employ passive damping to eliminate compressor vibration, or use flexible connections between the miniature linear compressor Stirling refrigerator and the external environment to block the vibration transmission path. However, this passive damping method can only eliminate low-to-medium frequency vibrations in the miniature linear compressor Stirling refrigerator, and cannot eliminate high-frequency vibrations.

[0044] Based on this, the present application provides a refrigeration machine with a relatively compact structure, small size and light weight.

[0045] Figure 1 This is a schematic diagram of the structure of the refrigeration unit provided in the embodiments of this application; Figure 2 A schematic diagram of the rear structure of the refrigerator provided in an embodiment of this application; Figure 3 for Figure 1 Sectional view AA in the diagram. (Refer to...) Figures 1 to 3 As shown, the refrigerator provided in this application embodiment includes a housing 100, an expansion unit 200, a compression unit 300, and a vibration damping unit 400. The housing 100 has a cavity 110. The compression unit 300 and the vibration damping unit 400 are located in the cavity 110. The compression unit 300 is connected to the housing 100. The expansion unit 200 is partially located in the cavity 110 and communicates with the compression unit 300.

[0046] The vibration damping unit 400 is mounted on the compression unit 300, and part of the vibration damping unit 400 is located inside the compression unit 300. The vibration damping unit 400 is used to dampen the vibration of the refrigeration unit.

[0047] To achieve a simpler, more aesthetically pleasing overall appearance and a more compact structure, the compression unit 300 and vibration damping unit 400 are housed within the casing 100. The expansion unit 200 is partially located within the casing 100, with the portion outside the casing connected to external equipment for cooling. The compression unit 300 increases the pressure of the low-pressure working gas to a high-pressure working gas. The motor of the compression unit 300 drives the actuator to compress the working gas, providing power to the expansion unit 200 and outputting compressed working gas to it. The expansion unit 200 utilizes the mechanical work output during the expansion and depressurization of the compressed working gas, consuming the internal energy of the working gas itself, thereby significantly reducing its temperature and achieving the purpose of cooling.

[0048] The vibration damping unit 400 is mounted on the compression unit 300, and the vibration damping unit 400 and the compression unit 300 share some structures and magnetic circuits, thereby simplifying the structure of the refrigeration unit. As a result, the refrigeration unit has a more compact structure, smaller size and weight, which is beneficial for the miniaturization and weight reduction of the refrigeration unit. The vibration damping unit 400 adopts an active vibration damping method, which can eliminate or reduce the high-frequency vibration generated by the compression unit 300 and the expansion unit 200, resulting in better vibration damping effect of the refrigeration unit.

[0049] It should be understood that the refrigeration unit may also include a heat exchange unit located outside the cavity 110 and covered by the expansion unit 200. In specific implementation, the heat exchange unit may be a heat exchanger made of copper. The heat exchange unit can increase the heat capacity of the refrigeration unit, thereby making the refrigeration temperature of the refrigeration unit more uniform. In specific implementation, it can be set according to the usage requirements of the refrigeration unit. This embodiment does not limit it in this way.

[0050] Figure 4 for Figure 3 A magnified view of a section at point B. (Refer to...) Figures 1 to 4 As shown, in one optional implementation, the vibration damping unit 400 and the compression unit 300 are coaxially arranged. The compression unit 300 includes a first stator 310 and a first coil 320 located inside the first stator 310. The vibration damping unit 400 includes a second coil 410 located inside the first stator 310 and outside the first coil 320.

[0051] Most of the components in the housing 100, expansion unit 200, compression unit 300, and vibration damping unit 400 are rotating parts, and the expansion unit 200, compression unit 300, and vibration damping unit 400 are coaxially designed, meaning that the central axes of the rotating components in the expansion unit 200, compression unit 300, and vibration damping unit 400 coincide. In the following description of the embodiments, unless otherwise specified, the central axis refers to the central axis of the expansion unit 200.

[0052] To fix the first coil 320 and the second coil 410, a plurality of annular grooves 311 are provided in the first stator 310. The first coil 320 and the second coil 410 are sequentially fitted into different annular grooves 311 of the first stator 310. In this way, the first coil 320 and the second coil 410 can share the first stator 310, and the vibration damping unit 400 does not need to be provided with an additional stator for fixing the second coil 410. The vibration damping unit 400 and the compression unit 300 can share part of the magnetic circuit, and the structure of the vibration damping unit 400 and the compression unit 300 is simplified. As a result, the refrigerator can achieve a more compact structure and a lighter weight.

[0053] Reference Figures 1 to 4As shown, in some embodiments, the compression unit 300 further includes an isolation cylinder 330, a cylinder 340, and a first mover 350. The first stator 310 is sleeved on the isolation cylinder 330. The first end of the isolation cylinder 330 in the extending direction abuts against the inner wall of the first end of the housing 100, and the second end of the isolation cylinder 330 in the extending direction abuts against the inner wall of the second end of the housing 100, so as to divide the cavity 110 into a first chamber 111 and a second chamber 112. The first chamber 111 surrounds the periphery of the second chamber 112.

[0054] The first stator 310, the first coil 320, and the vibration damping unit 400 are located in the first chamber 111, and the cylinder 340 and the first mover 350 are located in the second chamber 112. The first mover 350 includes a piston 351 and a first magnet 352. The piston 351 includes a first insertion part 3511 and a connecting part 3512 connected to the first insertion part 3511. The first insertion part 3511 is partially located inside the cylinder 340 and reciprocates along the axial direction of the cylinder 340. The connecting part 3512 is located outside the cylinder 340, and the first magnet 352 is sleeved on the connecting part 3512.

[0055] It is understandable that the direction of the expansion unit 200 away from the housing 100 is the front end of the refrigerator, and correspondingly, the opposite direction is the rear end of the refrigerator. The isolation cylinder 330 is a cylindrical part with an opening at one end. The opening direction of the isolation cylinder 330 is consistent with the front end direction of the refrigerator, and the opening of the isolation cylinder 330 has an extension edge that abuts against the inner wall of the front end housing 100 of the refrigerator. The other end of the isolation cylinder 330 abuts against the inner wall of the rear end housing 100 of the refrigerator. In this way, the isolation cylinder 330 can divide the cavity 110 of the housing 100 into two parts, namely the second chamber 112. The chamber inside the isolation cylinder 330 is the one where the outer side wall of the isolation cylinder 330 and the inner side wall of the housing 100 meet. The enclosed portion is the second chamber 112. The first chamber 111 and the second chamber 112 are isolated from each other. The first stator 310, the first coil 320 and the vibration damping unit 400 are located in the first chamber 111, and the cylinder 340 and the first mover 350 are located in the second chamber 112. In this way, the isolation cylinder 330 can place the first coil 320 and the first stator 310 outside the compression unit 300, so as to realize the purpose of the compression unit 300 and the vibration damping unit 400 sharing the first stator 310, thereby making the structure of the refrigerator more compact and the weight lighter.

[0056] An annular groove is provided on the connecting part 3512, and the first magnet 352 is sleeved in the annular groove. There is a gap between the first magnet 352 and the inner wall of the isolation cylinder 330. The cylinder 340 is fixed on the housing 100, and there is a gap between the first insertion part 3511 and the inner wall of the cylinder 340. When the refrigerator is working, an alternating current is passed through the first coil 320, thereby generating an alternating magnetic field. The alternating magnetic field drives the first magnet 352 to reciprocate along the central axis. Under the drive of the first magnet 352, the piston 351 can reciprocate relative to the cylinder 340 along the central axis. The gas working medium in the cylinder 340 reciprocates under the push of the piston 351. Alternating pressure fluctuations are generated in the compression cavity formed by the first insertion part 3511, the inner wall of the cylinder 340, and the housing 100. The gas working medium is compressed and releases heat in the compression unit 300 and expands and absorbs heat in the expansion unit 200, thereby realizing the refrigeration cycle of compression, heat release, expansion, and heat absorption. The working gas can be helium or other refrigeration gases, and this embodiment does not limit this.

[0057] Reference Figures 1 to 4 As shown, as an optional implementation, the compression unit 300 further includes a second stator 360, which is sleeved on the cylinder 340 and located between the cylinder 340 and the first magnet 352. The cylinder 340 is connected to the inner wall of the housing 100.

[0058] Specifically, the second stator 360 is located within the second chamber 112 and between the cylinder 340 and the connecting portion 3512. A gap exists between the connecting portion 3512 and the second stator 360, and a gap also exists between the connecting portion 3512 and the inner wall of the isolation cylinder 330, allowing the piston 351 to reciprocate relative to the second stator 360 and the cylinder 340 along the central axis. The second stator 360 is located on the side of the first magnet 352 closer to the central axis, and the first stator 310 is located on the side of the first magnet 352 furthest from the central axis. When the refrigerator is operating, an alternating current flows through the first coil 320, generating an alternating magnetic field within the first stator 310, the second stator 360, and the first magnet 352. This drives the first magnet 352 to reciprocate along the central axis, thereby causing the piston 351 to reciprocate along the central axis to compress the gaseous working fluid. The cylinder 340 is abutted against the inner wall of the housing 100 on the side near the front end of the refrigerator, and the second stator 360 is abutted against the side of the cylinder 340 near the rear end of the refrigerator, thereby fixing the cylinder 340 and the second stator 360 to the housing 100. The first magnet 352 can be a permanent magnet.

[0059] Reference Figures 1 to 4As shown, as an optional implementation, the vibration damping unit 400 further includes a second mover 420, which includes a second mover body 421 and a second magnet 422. The second mover body 421 is sleeved on the first stator 310, and the second magnet 422 is located inside the second mover body 421. Both ends of the first stator 310 are connected to leaf springs 430, which are connected by a first connector 440, and / or the leaf springs 430 are connected to the housing 100 by the first connector 440.

[0060] Specifically, the first coil 320 and the second coil 410 are sequentially sleeved in the annular groove 311 of the first stator 310, and the second mover body 421 is sleeved on the first stator 310. The second magnet 422 is located on the side of the second mover body 421 closer to the central axis, and the first coil 320 is located on the side of the first stator 310 closer to the central axis, while the second mover 420 is located on the side of the first stator 310 furthest from the central axis. When the refrigerator is working, an alternating current flows through the second coil 410, thereby generating an alternating magnetic field. The alternating magnetic field drives the second magnet 422 to reciprocate along the central axis, thereby driving the second mover body 421 to reciprocate along the central axis. The direction of movement of the second mover 420 is opposite to the direction of movement of the first mover 350, so as to eliminate or reduce the vibration of the compression unit 300, thereby achieving the purpose of vibration reduction of the refrigerator. Both ends of the first stator 310 are connected to leaf springs 430. The first stator 310, the first coil 320, the second coil 410, and the second mover 420 form a mass block, and the leaf springs 430 are springs. Thus, the mass block and the springs form a vibration damping system to eliminate or reduce the vibration of the compression unit 300 and the expansion unit 200. In specific implementations, depending on the power of the refrigerator, the resonant frequency of the leaf spring 430 is designed to be the same as or close to the resonant frequency of the compression unit 300. This reduces the energy consumed by the vibration damping unit 400 to actively eliminate or reduce the vibration of the refrigerator, thereby making the refrigerator more energy-efficient. The second magnet 422 can be a permanent magnet.

[0061] The leaf spring 430 includes a first leaf spring 431 and a second leaf spring 432. Both the first leaf spring 431 and the second leaf spring 432 have through holes. A first connecting member 440 passes through the through holes of the first leaf spring 431 and the second leaf spring 432 to connect them. The diameter of the first connecting member 440 near the tail end of the refrigerator is larger than the inner diameter of the through hole. The first connecting member 440 passes through the through hole of the first leaf spring 431 so that the first leaf spring 431 abuts against the first connecting member 440. The first connecting member 440 near the front end of the refrigerator has external threads. The first connecting member 440 passes through the through hole of the second leaf spring 432. The first leaf spring 431 and the second leaf spring 432 are fixedly connected to the first connecting member 440 through the engagement of the external threads and the nut 441. The side of the first connecting member 440 near the tail end of the refrigerator is threadedly connected to the housing 100 to fix the leaf spring 430 to the housing 100.

[0062] The leaf spring 430 can be a ring leaf spring, and the first connecting member 440 can be a stud, bolt, or other fastening connecting member. This embodiment does not limit this.

[0063] Reference Figures 1 to 4 As shown, in some embodiments, the refrigeration unit further includes a circuit board 500, which is sleeved on the first end of the isolation cylinder 330. The isolation cylinder 330 is located between the circuit board 500 and the expansion unit 200. The compression unit 300 and the vibration damping unit 400 are both electrically connected to the circuit board 500, that is, the circuit board 500 is shared by the compression unit 300 and the vibration damping unit 400. The circuit board 500 is provided with an output interface 510, and part of the output interface 510 is located outside the housing 100.

[0064] The circuit board 500 is fitted onto the side of the isolation cylinder 330 near the tail end of the refrigerator, and the circuit board 500 abuts against the inner wall of the housing 100 near the tail end of the refrigerator. This makes the refrigerator structure more compact and lighter, while also reducing the electromagnetic radiation emitted by the motor drive pulses. The circuit board 500 has an output interface 510 reserved on the outside of the housing. The flexible flat cable 520 is electrically connected to the circuit board 500 through the output interface 510, thereby realizing the driving and control of the compression unit 300 and the vibration damping unit 400.

[0065] Reference Figures 1 to 4 As shown, in one optional implementation, the circuit board 500 has at least one connection hole 530, and the first connector 440 is provided in a one-to-one correspondence with the connection hole 530. The end of the first connector 440 facing the circuit board 500 has a threaded hole 442, and the second connector 443 passes through the housing 100 and the connection hole 530 in sequence and is connected to the threaded hole 442.

[0066] To secure the circuit board 500 to the housing 100, the circuit board 500 has at least one connection hole 530. A first connector 440 is fixedly connected to the circuit board 500 and the housing 100 via a second connector 443. In specific implementations, different numbers of connection holes 530 can be provided on the circuit board 500 according to different requirements of the refrigerator. Correspondingly, the number of first connectors 440 is the same as the number of connection holes 530, so that the circuit board 500 can be stably and reliably fixed to the housing 100. The first connector 440 also includes a threaded hole 442. The first connector 440 has a threaded hole 442 on the side near the tail end of the refrigerator. The second connector 443 passes through the housing 100, the connection hole 530, and connects to the threaded hole 442 in sequence to fix the circuit board 500 and the leaf spring 430 to the housing 100. The second connector can be a bolt, stud, or screw; this embodiment does not limit this.

[0067] Reference Figures 1 to 4 As shown, in some embodiments, the housing 100 includes a housing body 120 and a housing cover 130 covering the housing body 120. The housing cover 130 has a mounting hole 131 that communicates with the cylinder 340. An airflow channel is formed between the mounting hole 131 and the cylinder 340. The expansion unit 200 is mounted on the mounting hole 131 and is coaxially arranged with the cylinder 340.

[0068] Specifically, the housing 120 and the cover 130 covering the housing 120 together form a cavity 110 to accommodate the compression unit 300 and the vibration damping unit 400. The cover 130 can be a rotating component with a through hole in the center, that is, the cover 130 has a mounting hole 131 in the center, which communicates with the cylinder 340 so that an airflow channel is formed between the mounting hole 131 and the inner wall of the cylinder 340, which is used to provide an airflow channel for the gaseous working fluid to flow from the compression unit 300 to the expansion unit 200. The mounting hole 131, the inner wall of the cylinder 340, the piston 351 and the expansion unit 200 form a compression chamber. The expansion unit 200 communicates with the compression chamber. The piston 351 reciprocates along the central axis to generate alternating pressure. Under the action of alternating pressure, the gaseous working fluid is compressed and releases heat in the compression chamber. The expansion unit 200 and the cylinder 340 share the same central axis. Driven by the cylinder 340, the expansion unit 200 reciprocates along the central axis to allow the gaseous working medium to expand and absorb heat in the expansion unit 200, thereby achieving a refrigeration cycle. Thus, the compression unit 300 can provide power for the expansion unit 200 to expand and absorb heat.

[0069] Reference Figures 1 to 4As shown, in one optional embodiment, the expansion unit 200 includes a housing 210 and an exhaustor 220. The housing 210 is partially inserted into the mounting hole 131. The housing 210 has a receiving cavity 211. The extending direction of the receiving cavity 211 is consistent with the axial direction of the cylinder 340. The receiving cavity 211 is in communication with the airflow channel. The exhaustor 220 is located in the receiving cavity 211 and reciprocates along the extending direction of the receiving cavity 211.

[0070] The cavity formed by the receiving chamber 211 and the discharge device 220 near the front end of the refrigerator is the expansion chamber. The heat exchange unit is installed on the outer shell 210 near the front end of the refrigerator. The gaseous working fluid expands and absorbs heat in the expansion chamber to generate cooling energy. The refrigerator transfers the cooling energy to external equipment through the heat exchange unit to cool the external equipment. There is a gap between the discharge device 220 and the outer shell 210, and the discharge device 220 reciprocates along the central axis in the receiving chamber 211.

[0071] When the refrigerator is working, an alternating current flows through the first coil 320, thereby generating an alternating magnetic field. The alternating magnetic field drives the first magnet 352 to reciprocate along the central axis. Driven by the first magnet 352, the piston 351 reciprocates along the central axis. The gaseous working fluid is compressed and releases heat in the compression chamber, generating alternating pressure fluctuations in the compression chamber, which in turn drives the discharge device 220 to reciprocate along the central axis. The gaseous working fluid expands and absorbs heat in the expansion chamber. Thus, the refrigerator completes the refrigeration cycle of compression, heat release, expansion, and heat absorption.

[0072] Continue to refer to Figures 1 to 4 As shown, in some embodiments, the outer casing 210 includes a second insertion portion 212, an abutment portion 213, and an extension portion 214 connected in sequence. The receiving cavity 211 extends from the second insertion portion 212 and the abutment portion 213 to the extension portion 214 in sequence. The second insertion portion 212 is inserted into the mounting hole 131, and the abutment portion 213 abuts against the outer surface of the casing 130. The first end of the discharge device 220 is located in the airflow channel. The first end of the discharge device 220 is connected to the end of the second insertion portion 212 through an elastic member 230. The second end of the discharge device 220 is located in the receiving cavity 211 corresponding to the extension portion 214.

[0073] To form a closed chamber, the second insertion part 212 is inserted into the mounting hole 131, and the abutment part 213 abuts against the outer surface of the cover 130, making it difficult for the gaseous working medium to leak from the cover 130 and the outer shell 210. Thus, the isolation cylinder 330, the cover 130, and the outer shell 210 together form a closed chamber to provide a closed space for the gaseous working medium to be compressed and expanded.

[0074] In order to limit the displacement of the discharge device 220 when it reciprocates along the central axis, an elastic element 230 is provided at the end of the second insertion part 211. The side of the discharge device 220 near the tail end of the refrigerator is connected to the second insertion part 211 through the elastic element 230. Thus, when the discharge device 220 moves along the central axis toward the tail end of the refrigerator, the displacement of the discharge device 220 in the direction of the tail end of the refrigerator along the central axis is limited due to the tension of the elastic element 230.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A refrigeration machine, characterized in that, The device includes a housing, a compression unit, an expansion unit, and a vibration damping unit. The housing has a cavity, and the compression unit and the vibration damping unit are located within the cavity. The compression unit is connected to the housing, and the expansion unit is partially located within the cavity and communicates with the compression unit. The vibration damping unit is sleeved on the compression unit, and the vibration damping unit is partially located inside the compression unit. The vibration damping unit is used to dampen the vibration of the compression unit. The vibration damping unit is coaxially arranged with the compression unit. The compression unit includes a first stator and a first coil located inside the first stator. The vibration damping unit includes a second coil located inside the first stator and outside the first coil. The compression unit further includes an isolation cylinder, a cylinder, and a first moving part. The first stator is sleeved on the isolation cylinder. The first end of the isolation cylinder in the extending direction abuts against the inner wall of the first end of the housing, and the second end of the isolation cylinder in the extending direction abuts against the inner wall of the second end of the housing, so as to divide the cavity into a first chamber and a second chamber. The first chamber surrounds the periphery of the second chamber. The first stator, the first coil, and the vibration damping unit are located in the first chamber, and the cylinder and the first mover are located in the second chamber. The first mover includes a piston and a first magnet. The piston includes a first insertion part and a connecting part connected to the first insertion part. The first insertion part is located inside the cylinder and reciprocates along the axial direction of the cylinder. The connecting part is located outside the cylinder. The first magnet is sleeved on the connecting part and connected to the connecting part.

2. The refrigeration machine according to claim 1, characterized in that, The compression unit further includes a second stator, which is sleeved on the cylinder and located between the cylinder and the first magnet. The cylinder is connected to the inner wall of the housing.

3. The refrigeration machine according to claim 2, characterized in that, The vibration damping unit further includes a second mover, which includes a second mover body and a second magnet. The second mover body is sleeved on the first stator, and the second magnet is located inside the second mover body. Both ends of the first stator are connected to leaf springs, which are connected by a first connector, and / or the leaf springs are connected to the housing by the first connector.

4. The refrigeration machine according to claim 3, characterized in that, It also includes a circuit board, which is sleeved on the first end of the isolation cylinder. The isolation cylinder is located between the circuit board and the expansion unit. The compression unit and the vibration damping unit are both electrically connected to the circuit board. The circuit board is provided with an output interface, which is located outside the housing.

5. The refrigeration machine according to claim 4, characterized in that, The circuit board has at least one connection hole, and the first connector is provided in a one-to-one correspondence with the connection hole. The end of the first connector facing the circuit board has a threaded hole, and the second connector passes through the housing and the connection hole in sequence and connects to the threaded hole.

6. The refrigeration machine according to any one of claims 1-4, characterized in that, The housing includes a body and a cover on the body. The cover has a mounting hole that communicates with the cylinder and forms an airflow channel between the mounting hole and the cylinder. The expansion unit is mounted on the mounting hole and is coaxially arranged with the cylinder.

7. The refrigeration machine according to claim 6, characterized in that, The expansion unit includes a housing and an exhaust device. The housing is partially inserted into the mounting hole. The housing has a receiving cavity inside. The extending direction of the receiving cavity is consistent with the axial direction of the cylinder. The receiving cavity is connected to the airflow channel. The exhaust device is located inside the receiving cavity and reciprocates along the extending direction of the receiving cavity.

8. The refrigeration machine according to claim 7, characterized in that, The outer casing includes a second insertion part, an abutment part, and an extension part connected in sequence. The receiving cavity extends from the second insertion part and the abutment part to the extension part in sequence. The second insertion part is inserted into the mounting hole. The abutment part abuts against the outer surface of the casing cover. The first end of the discharge device is located in the airflow channel. The first end of the discharge device is connected to the end of the second insertion part by an elastic element. The second end of the discharge device is located in the receiving cavity corresponding to the extension part.

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