JT throttling refrigeration system driven by superconducting direct-current linear compressor

Abstract

The utility model relates to the technical field of mechanical refrigeration, and provides a JT throttling refrigeration system driven by a superconducting direct-current linear compressor, which comprises a precooling refrigerator, a cold head and a compressor shell, the superconducting linear motor and the compression unit are both arranged in the compressor shell; the heat exchanger is used for pre-cooling the high-pressure incoming flow gas by utilizing the backflow cold gas; the throttling valve penetrates through the heat exchanger and communicates with the high-pressure end of the compression unit; one end of the evaporator is connected with the throttle valve, and the other end of the evaporator penetrates through the heat exchanger and is connected with the low-pressure end of the compression unit; the vacuum cover is used for vacuum heat insulation and heat radiation shielding; the superconducting linear motor, the compression unit, the cold head, the heat exchanger, the throttling valve and the evaporator are all located in the vacuum cover. The superconducting linear motor is adopted for driving, high current capacity is achieved, Joule heat loss is eliminated, and therefore higher compression efficiency is obtained, the whole machine is miniaturized, low in power consumption and high in reliability, and the output performance of the compression unit is improved.

Description

Technical Field

[0001] This utility model relates to the field of mechanical refrigeration technology, and in particular to a JT throttling refrigeration system driven by a superconducting DC linear compressor. Background Technology

[0002] A pre-cooling refrigerator is a type of refrigeration equipment that adds a pre-cooling stage to the refrigeration cycle. It typically uses a lower-temperature fluid or refrigeration system to initially cool the object being cooled or the refrigerant, and then further reduces the temperature through the main refrigeration system to achieve a lower refrigeration temperature or improve refrigeration efficiency.

[0003] like Figure 1 As shown, this is a liquid helium temperature-range pre-cooling refrigerator in the prior art. Pre-cooling is provided by a two-stage pre-cooler A01. The helium working fluid is compressed by the compressor to form a high-pressure gas. The high-pressure gas is cooled by the returning low-pressure gas as it flows through three-stage counter-current indirect heat exchangers A09, A10, and A11. Then, as it flows through two-stage pre-cooling heat exchangers A12 and A13, it is cooled to the corresponding pre-cooling temperature by the pre-cooler cold heads A14 and A15. Subsequently, it is cooled by the expansion valve A17 to produce a cooling effect and is reduced to a low pressure. The low-pressure gas absorbs heat load through the cold head heat exchanger A18 to provide cooling capacity, and finally returns to the compressor via the low-pressure side of the three-stage counter-current indirect heat exchangers A11, A10, and A09.

[0004] The compressor is generally a linear compressor. A linear compressor includes a linear drive mechanism A02, a cylinder A04, and a piston A05. The linear drive mechanism A02 drives the connecting rod A03 and the piston A05 to reciprocate within the cylinder A04. The intake valve plate A06 and the exhaust valve plate A07 alternately open and close to form a unidirectional flow of gas.

[0005] However, because the compressor operates at ambient temperature, the cold head of the precooler and the heat exchanger of the JT throttling refrigeration unit operate in a vacuum low-temperature environment, installed inside the vacuum enclosure A08. The compressor is connected to the JT throttling component via piping, resulting in low compressor efficiency. Utility Model Content

[0006] This invention provides a JT throttling refrigeration system driven by a superconducting DC linear compressor, which solves the problem of low compressor efficiency in the prior art, achieves high current capability, and eliminates Joule heat loss, thereby obtaining higher compression efficiency.

[0007] This utility model provides a JT throttling refrigeration system driven by a superconducting DC linear compressor, comprising:

[0008] Pre-cooling refrigeration unit, equipped with a cold head;

[0009] The compressor housing is in contact with the cold head;

[0010] Both the superconducting linear motor and the compression unit are located inside the compressor housing, and the compression unit outputs high-pressure gas working fluid under the drive of the superconducting linear motor; wherein, the coil of the superconducting linear motor is made of superconducting material;

[0011] A heat exchanger is used to precool high-pressure incoming gas using reflux cold gas;

[0012] A throttle valve passes through the heat exchanger and is connected to the high-pressure end of the compression unit;

[0013] An evaporator, one end of which is connected to the throttling valve, and the other end of which passes through the heat exchanger and is connected to the low-pressure end of the compression unit;

[0014] The vacuum enclosure is used for vacuum insulation and shielding of thermal radiation; and the superconducting linear motor, the compression unit, the cold head, the heat exchanger, the throttling valve and the evaporator are all located inside the vacuum enclosure.

[0015] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor is provided, wherein the superconducting linear motor includes:

[0016] A superconducting coil, made of superconducting material, can reciprocate linearly when an alternating voltage is applied.

[0017] Permanent magnets are used to provide a continuous and stable magnetic field;

[0018] A yoke, connected to the permanent magnet, is used to guide magnetic lines of force to form a closed loop;

[0019] A coil support is used to connect the superconducting coil and the compression unit so that the compression unit reciprocates linearly with the superconducting coil.

[0020] According to the JT throttling refrigeration system driven by a superconducting DC linear compressor provided by this utility model, the superconducting linear motor further includes:

[0021] The leaf spring assembly has its outer ring connected to the fixed end and its center connected to the piston of the compression unit. The leaf spring assembly is used to provide support for the compression unit to perform oscillating linear motion in the axial direction.

[0022] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor is provided, wherein the compression unit includes:

[0023] The piston is connected to both the coil support and the leaf spring assembly;

[0024] The cylinder provides space for compressing and throttling the working fluid during the reciprocating motion of the piston;

[0025] An intake valve and an exhaust valve are disposed on the cylinder, and the intake valve and the exhaust valve alternately open and close based on the gas pressure difference between the cylinder and the inlet and outlet pipelines; the high-pressure gas discharged by the exhaust valve passes through the heat exchanger and is connected to one end of the throttle valve, and the gas returning from the intake valve passes through the heat exchanger and is connected to one end of the evaporator.

[0026] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor further includes:

[0027] A flexible cold chain is provided between the cold head and the compressor housing.

[0028] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor is provided, wherein the pre-cooling refrigeration unit adopts a two-stage or multi-stage cold head refrigeration method, and the refrigeration temperature of the final stage cold head is lower than the temperature required for the normal operation of the superconducting coil.

[0029] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor is provided, wherein the superconducting linear motors are used in pairs and arranged back to back in a straight line, and the two superconducting linear motors are driven by the same voltage and move in opposite directions.

[0030] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor is provided, wherein the heat exchanger adopts a coaxial spiral sleeve structure.

[0031] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor is provided, wherein the evaporator adopts a slit type, spiral tube type, needle rib type or porous filling type evaporator.

[0032] According to the present invention, a JT throttling refrigeration system driven by a superconducting DC linear compressor is provided, wherein the vacuum shroud adopts a vacuum multi-layer shell structure.

[0033] The JT throttling refrigeration system driven by the superconducting DC linear compressor provided by this utility model improves the system efficiency of the refrigeration machine by arranging the compression unit at low temperature, thereby increasing the working fluid density and reducing the compression work. It adopts a superconducting linear motor drive to achieve high current capability and eliminate Joule heat loss, thereby obtaining higher compression efficiency. At the same time, the whole machine has the advantages of miniaturization, low power consumption and high reliability, which improves the system efficiency of the refrigeration machine. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in this utility model 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 utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the JT throttling refrigeration system in the prior art.

[0036] Figure 2 This is a schematic diagram of the structure of the JT throttling refrigeration system driven by the superconducting DC linear compressor provided by this utility model.

[0037] Figure label:

[0038] 1. Pre-cooling refrigeration unit; 2. Cold head; 3. Compressor housing; 4. Superconducting linear motor; 41. Superconducting coil; 42. Permanent magnet; 43. Yoke; 44. Coil support; 45. Leaf spring assembly; 5. Compression unit; 51. Piston; 52. Cylinder; 53. Inlet valve; 54. Exhaust valve; 6. Heat exchanger; 7. Throttling valve; 8. Evaporator; 9. Vacuum enclosure; 10. Flexible cold chain. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0040] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] The following is combined with Figure 2 This invention describes a JT throttling refrigeration system driven by a superconducting DC linear compressor.

[0042] This utility model provides a JT throttling refrigeration system driven by a superconducting DC linear compressor, including a pre-cooling refrigeration unit 1, a cold head 2, a compressor housing 3, a superconducting linear motor 4, a compression unit 5, a heat exchanger 6, a throttling valve 7, an evaporator 8, and a vacuum shroud 9.

[0043] The precooling refrigerator 1 can be a small low-temperature refrigerator such as a GM type refrigerator, a Stirling refrigerator, or a pulse tube refrigerator. The precooling refrigerator 1 has a cold head 2, and the compressor housing 3 is in contact with the cold head 2 so as to precool the compressor housing 3 through the cold head 2.

[0044] A superconducting linear motor 4 and a compression unit 5 constitute a superconducting DC linear compressor. Both the superconducting linear motor 4 and the compression unit 5 are sealed inside the compressor housing 3, which is filled with a refrigerant gas at a certain pressure, while the outside is a vacuum environment. The coil of the superconducting linear motor 4 is made of superconducting material, which has excellent superconducting properties and can drive the compression unit 5 to stably output high-pressure refrigerant gas.

[0045] Heat exchanger 6 utilizes the principle of heat exchange, precooling the high-pressure incoming gas using reflux cold gas. The high-pressure gas pipeline of heat exchanger 6 is connected to the inlet end of throttle valve 4. Throttling valve 7 passes through heat exchanger 6 and is connected to the high-pressure end of compression unit 5; small holes are opened on the metal plate of throttle valve 7, and when the high-pressure gas working fluid passes through the small holes, it will expand, producing a cooling effect.

[0046] One end of the evaporator 8 is connected to the throttle valve 7, and the other end of the evaporator 8 passes through the heat exchanger 6 and is connected to the low-pressure end of the compression unit 5. The evaporator 8 is a heat exchanger used to absorb heat from the target load. The evaporator 8 can absorb external heat to achieve the purpose of refrigeration.

[0047] The vacuum enclosure 9 is used for vacuum insulation and shielding of thermal radiation; and the superconducting linear motor 4, compression unit 5, cold head 2, heat exchanger 6, throttle valve 7 and evaporator 8 are all located inside the vacuum enclosure 9, minimizing the interference of the external environment on the system operation.

[0048] In actual operation, the JT throttling refrigeration system driven by the superconducting DC linear compressor provided in this embodiment first starts the pre-cooling refrigerator 1 to pre-cool the superconducting linear motor 4. Once the temperature drops to the optimal operating temperature of the superconducting linear motor 4, the superconducting linear motor 4 is started. At this time, the gas is compressed into high-pressure gas under the action of the compression unit 5, and then discharged to the throttling valve 7. The throttling valve 7 throttles and cools the high-pressure gas, producing a cooling effect, and the gas pressure drops to low pressure. The low-pressure gas passes through the evaporator 8, providing cooling capacity by absorbing heat load. Afterwards, the low-pressure gas flows through the low-pressure side of the heat exchanger 6 and finally returns to the compression unit 5. During this process, the high-pressure gas is further cooled by the returning low-pressure side gas as it flows through the heat exchanger 6.

[0049] Compared to traditional refrigeration systems, in this embodiment of the invention, the superconducting linear motor 4 and the compression unit 5 are arranged at low temperatures, which effectively increases the working fluid density, reduces energy loss during compression, and lowers the compression work, thereby improving the efficiency of the refrigeration system.

[0050] The superconducting linear motor 4-drive system achieves high current capability and eliminates Joule heat loss, resulting in higher compression efficiency. At the same time, the whole machine has the advantages of miniaturization, low power consumption, and high reliability, which improves the system efficiency of the refrigeration unit.

[0051] In some feasible embodiments of this utility model, the superconducting linear motor 4 includes a superconducting coil 41, a permanent magnet 42, a yoke 43, and a coil support 44. The superconducting coil 41 is the moving part of the superconducting linear motor 4, made of superconducting material, and can move linearly reciprocally after an AC voltage is applied. The superconducting coil is wound with other superconducting wires such as MgB2, Bi2223, or YBCO, and operates at a temperature below 30K. These superconducting wires have zero resistance characteristics at the above operating temperature. Compared with traditional coils, this not only improves motor efficiency but also reduces additional heat dissipation requirements, helping to maintain a low-temperature environment inside the system and further reducing the overall energy consumption of the system. At the same time, as a linear reciprocating motion component, the superconducting coil 41 can generate a strong magnetic field under the drive of AC voltage, which interacts with the magnetic field of the permanent magnet 42 to provide a stable and strong driving force for the compression unit 5, ensuring the efficient operation of the system.

[0052] The permanent magnet 42 provides a continuous and stable magnetic field, serving as the excitation component of the superconducting linear motor 4. It is typically made of permanent magnet materials such as praseodymium iron boron, neodymium iron boron, and cobalt iron. These materials possess high remanence and high coercivity, enabling them to generate a stable and powerful magnetic field. This stable excitation magnetic field makes the operation of the superconducting linear motor 4 smoother, reducing vibration and noise during operation and improving the motor's reliability and stability. Furthermore, the permanent magnet 42 eliminates the need for an additional excitation power supply, reducing system complexity and energy consumption.

[0053] The yoke 43 is connected to the permanent magnet 42 to guide the magnetic field lines to form a closed loop. By rationally designing the shape and material of the yoke 43, the magnetic circuit distribution can be optimized, leakage flux can be reduced, and the efficiency of the magnetic circuit can be improved. The efficient magnetic circuit enables the magnetic field of the superconducting linear motor 4 to be fully utilized, enhances the interaction force between the superconducting coil 41 and the permanent magnet 42, and further improves the performance of the motor.

[0054] The coil support 44 is used to connect the superconducting coil 41 and the compression unit 5 so that the compression unit 5 moves linearly back and forth with the superconducting coil 41. This enables the compression unit 5 to respond more accurately to the movement of the superconducting coil 41 and improves the compression performance and stability of the compression unit 5.

[0055] In some feasible embodiments of this utility model, the superconducting linear motor 4 further includes a leaf spring assembly 45, with the outer ring connected to the fixed end and the center connected to the compression unit 5. The leaf spring assembly 45 provides support for the compression unit 5 to perform oscillating linear motion in the axial direction. The leaf spring assembly 45 has good elastic recovery characteristics and can provide stable axial support force when the compression unit 5 performs oscillating linear motion. When the superconducting coil 41 drives the compression unit 5 to move, the leaf spring assembly 45 buffers and offsets part of the impact force and vibration during the movement through its own elastic deformation, ensuring that the compression unit 5 always moves linearly along the predetermined axial trajectory. This not only effectively improves the stability of the compression unit 5's movement but also enables it to respond more accurately to the movement commands of the superconducting coil 41, thereby enhancing the stability and reliability of the entire superconducting linear motor 4 and reducing energy loss and mechanical failures caused by movement deviations.

[0056] In some feasible embodiments of this utility model, the compression unit 5 includes a piston 51, a cylinder 52, an intake valve 53, and an exhaust valve 54.

[0057] Piston 51 is connected to coil support 44 and center-connected to leaf spring assembly 45, achieving precise and stable reciprocating motion. Cylinder 52 provides space for compressing and throttling the working fluid during the reciprocating motion of piston 51, and piston 51 is slidably disposed inside cylinder 52; this maximizes the compression ratio of the working stroke when piston 51 compresses gas inside cylinder 52, reducing efficiency loss caused by clearance volume.

[0058] Intake valve 53 and exhaust valve 54 are mounted on cylinder 52. Both valves open and close alternately based on the gas pressure difference between the cylinder 52 and the inlet / outlet pipes, achieving unidirectional flow of the working gas. This effectively prevents gas backflow and leakage, ensuring orderly gas flow within the system and optimizing the gas heat exchange process within heat exchanger 6. The high-pressure gas discharged from exhaust valve 54 passes through heat exchanger 6 and connects to one end of throttle valve 7. The gas returning from intake valve 53 passes through heat exchanger 6 and connects to one end of evaporator 8.

[0059] In some feasible embodiments of this invention, a flexible cold chain 10 is also included. The flexible cold chain 10 is disposed between the cold head 2 and the compressor housing 3, and serves for heat transfer and vibration damping. The flexible cold chain 10 provides elastic coupling for the cold head 2. Compared with traditional heat transfer methods, the flexible cold chain 10 can effectively reduce energy loss during heat transfer, ensuring that the cooling capacity generated by the cold head 2 can be utilized to the maximum extent, and quickly reducing the temperature of the compressor housing 3. This not only helps maintain the low-temperature operating environment of the superconducting linear motor 4 and improves the motor's operating efficiency, but also indirectly improves the cooling performance of the entire refrigeration system, enabling the system to reach the required cooling temperature in a shorter time, providing users with more efficient cooling services.

[0060] In some feasible embodiments of this utility model, the pre-cooling refrigerator 1 adopts a two-stage or multi-stage cold head cooling method, and the cooling temperature of the final stage cold head 2 is lower than the temperature required for the normal operation of the superconducting coil 41. For example... Figure 1 As shown, the pre-cooling refrigerator 1 includes a primary cold head and a secondary cold head. Both the primary and secondary cold heads are installed inside the vacuum chamber 9. The cooling temperature of the secondary cold head is below 30K.

[0061] In some feasible embodiments of this utility model, superconducting linear motors are used in pairs, arranged back-to-back in a straight line, and the two superconducting linear motors are driven by the same voltage and move in opposite directions. This can reduce the vibration caused by the movement. On the one hand, it ensures that the internal components of the system can work in a stable environment and avoid problems such as component displacement and loose connection caused by vibration, thereby ensuring the stability and reliability of the system operation. On the other hand, reducing vibration also helps to reduce noise generation, so that the refrigeration system can operate in a quieter environment and meet the application scenarios with high noise control requirements.

[0062] In some feasible embodiments of this utility model, the heat exchanger 6 adopts a coaxial spiral sleeve structure, which utilizes the countercurrent flow of hot and cold gases to accelerate cooling and make full use of the low-temperature cold energy returned after throttling. The heat exchanger 6 can also adopt other types of heat exchangers, as long as they can achieve a good heat exchange effect.

[0063] In some feasible embodiments of this utility model, the evaporator 8 is a slit type, spiral tube type, needle rib type or porous filling type evaporator, or other types of evaporators may also be used.

[0064] In some feasible embodiments of this utility model, the vacuum cover 9 adopts a vacuum multi-layer shell structure, which can bridge the functions of vacuum insulation and shielding thermal radiation.

[0065] Therefore, the JT throttling refrigeration system driven by the superconducting DC linear compressor provided by this utility model has its driving unit for the working fluid circulation of the throttling system arranged at a low temperature, which increases the working fluid density, reduces the compression work, and thus improves the system efficiency of the refrigeration machine. The use of a superconducting linear motor 4 achieves high current capability while eliminating Joule heat loss, resulting in higher compression efficiency. The entire unit also boasts advantages such as miniaturization, low power consumption, and high reliability.

[0066] In summary, the JT throttling refrigeration system driven by the superconducting DC linear compressor provided by this utility model has the characteristics of fast cooling speed, high cooling capacity, simple system structure, good reliability, and high system efficiency.

[0067] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "method," "specific method," or "some methods," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or method is included in at least one embodiment or method of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or method. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or methods. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or methods described in this specification, as well as the features of different embodiments or methods.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A superconducting DC linear compressor driven JT throttling refrigeration system, characterized in that, The application relates to a pre-cooling refrigerator (1) comprising: a cold head (2); a compressor shell (3) in contact with the cold head (2); a superconducting linear motor (4) and a compression unit (5) both arranged in the interior of the compressor shell (3), and the compression unit (5) outputs high-pressure gas working medium under the driving of the superconducting linear motor (4); wherein the coil of the superconducting linear motor (4) is made of superconducting material; a heat exchanger (6) for pre-cooling high-pressure inflow gas by using backflow cold gas; a throttle valve (7) penetrating through the heat exchanger (6) and being in communication with the high-pressure end of the compression unit (5); an evaporator (8) for providing and transferring cold quantity for a target heat source, one end of the evaporator (8) being connected with the throttle valve (7), and the other end of the evaporator (8) penetrating through the heat exchanger (6) and being connected with the low-pressure end of the compression unit (5); a vacuum cover (9) for vacuum heat insulation and shielding thermal radiation; and the superconducting linear motor (4), the compression unit (5), the cold head (2), the heat exchanger (6), the throttle valve (7) and the evaporator (8) are all located in the vacuum cover (9).

2. The superconducting linear compressor driven JT throttling refrigeration system of claim 1, wherein, The superconducting linear motor (4) comprises: a superconducting coil (41) made of superconducting material and capable of linear reciprocating motion after an alternating voltage is applied; a permanent magnet (42) for providing a continuous and stable magnetic field; a yoke (43) connected with the permanent magnet (42) and used for guiding magnetic lines to form a closed loop; a coil support (44) for connecting the superconducting coil (41) and the compression unit (5) so that the compression unit (5) linearly reciprocates with the superconducting coil (41).

3. The superconducting linear compressor driven JT throttling refrigeration system of claim 2, wherein, The superconducting linear motor (4) further comprises: a leaf spring group (45) with an outer ring connected with a fixed end and a center connected with the compression unit (5), and the leaf spring group (45) is used for providing support for the oscillating linear motion of the compression unit (5) in the axial direction.

4. The superconducting linear compressor driven JT throttling refrigeration system of claim 3, wherein, The compression unit (5) comprises: a piston (51) connected with the coil support (44) and the center of the leaf spring group (45); a cylinder (52) for providing a space for compressing and throttling working medium in the reciprocating motion of the piston (51); an air inlet valve (53) and an air outlet valve (54) arranged on the cylinder (52), and the air inlet valve (53) and the air outlet valve (54) are both opened and closed alternately based on the pressure difference of the gas in the cylinder (52) and the gas in the inlet and outlet pipelines; the high-pressure gas discharged by the air outlet valve (54) penetrates through the heat exchanger (6) and is connected with one end of the throttle valve (7), and the backflow gas of the air inlet valve (53) penetrates through the heat exchanger (6) and is connected with one end of the evaporator (8).

5. The superconducting DC linear compressor driven JT throttling refrigeration system according to any of claims 1-4, characterized in that, Further comprising: a flexible cold chain (10) arranged between the cold head (2) and the compressor shell (3).

6. The superconducting linear compressor driven JT throttling refrigeration system of claim 2, wherein, The pre-cooling refrigerator (1) adopts a refrigeration mode of two-stage or multi-stage cold heads, and the refrigeration temperature of the last-stage cold head (2) is lower than the temperature required for the normal operation of the superconducting coil (41).

7. The superconducting linear compressor driven JT throttling refrigeration system of claim 5, wherein, The superconducting linear motor (4) is arranged in pairs back to back in a straight line, and the two superconducting linear motors are driven by the same voltage and have opposite directions of motion.

8. The superconducting linear compressor driven JT throttling refrigeration system of claim 5, wherein, The heat exchanger (6) adopts a coaxial spiral sleeve structure.

9. The superconducting linear compressor driven JT throttling refrigeration system of claim 5, wherein, The evaporator (8) adopts a slit type, a spiral tube type, a needle rib type or a porous filling type evaporator.

10. The superconducting linear compressor driven JT throttling refrigeration system of claim 5, wherein, The vacuum cover (9) adopts a vacuum multilayer shell structure.

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