Stirling refrigerator

Abstract

This application relates to the technical field of refrigeration equipment, and discloses a Stirling refrigerator, which includes a Stirling refrigerator cold head device. The Stirling refrigerator cold head device includes a first housing with a hollow interior forming a compression chamber, and a piston head is arranged in the compression chamber. The Stirling refrigerator further includes a double-rotor linear compression device for compressing a first working medium. The double-rotor linear compression device includes: a second housing fixedly connected to the first housing and having a first channel coaxially arranged with the compression chamber inside; a first rotor assembly arranged in the first channel and defining an expansion chamber with the first housing; a second rotor assembly arranged inside the first rotor assembly, one end fixedly connected to the first rotor assembly, and the other end connected to the piston head through a connecting rod. In the Stirling refrigerator provided by the embodiments of the present disclosure, by controlling the different driving forces and motion phases of the first rotor assembly and the second rotor assembly, the motion phase and displacement of the first rotor assembly can be made different from the motion phase and displacement of the piston head.

Description

Technical Field

[0001] This application relates to the technical field of refrigeration equipment, for example, to a Stirling refrigerator. Background Art

[0002] With the development of military, medical, and aerospace technologies, cryogenic cooling equipment has made great progress. Due to different usage requirements, there are various types of Stirling refrigerators, mainly including rotary integral types, linear split types, and linear integral types, etc. However, the existing rotary integral Stirling refrigerators are large in size and have large vibrations. To reduce vibrations, additional weights are added; while the linear split Stirling refrigerator is divided into a compressor and an expander, which are connected by a pipeline in the middle. Since the linear compressor is separated from the cold head, the vibration is reduced to some extent, but the expansion piston of the expander can only be in a passive driving state, reducing the overall efficiency of the machine. If the expansion piston of the expander is also actively driven, another compressor drive will be added. Although the linear integral Stirling refrigerator cancels the middle connecting pipeline, making the compressor and the cold head integrally connected, the vibration increases to some extent, but the efficiency is improved. However, there is also the problem that the expansion piston cannot be actively driven. Summary of the Invention

[0003] To provide a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important elements or delineate the scope of protection of these embodiments. Instead, it serves as a preface to the subsequent detailed description.

[0004] Embodiments of the present disclosure provide a Stirling refrigerator to reduce the noise and vibration of the Stirling refrigerator while actively driving and controlling the operating displacement, phase, and the movement displacement and phase of the piston head of the double-rotor linear compression device.

[0005] In some embodiments, the Stirling refrigerator includes a Stirling refrigerator cold head device, which includes a first housing with a hollow interior forming a compression chamber. A piston head is provided in the compression chamber. The Stirling refrigerator further includes a double-rotor linear compression device for compressing the first working medium. The double-rotor linear compression device includes: a second housing fixedly connected to the first housing and having a first channel coaxially arranged with the compression chamber inside; a first rotor assembly disposed in the first channel and defining an expansion chamber with the first housing, configured to move in the axial direction of the expansion chamber towards the first housing under the action of a driving force; a second rotor assembly disposed inside the first rotor assembly, fixedly connected to the first rotor assembly at one end and connected to the piston head through a connecting rod at the other end, configured to synchronously drive the piston head to move in the compression chamber towards the first housing under the action of a driving force to compress the first working medium.

[0006] In some embodiments, the double-rotor linear compression device further includes: a stator assembly fixedly disposed on the second housing, forming a clearance seal with the first rotor assembly, and configured to drive the first rotor assembly to reciprocate axially along the axis of the expansion chamber.

[0007] In some embodiments, the stator assembly includes: a stator skeleton configured as a cylindrical structure; a stator magnetic induction coil disposed inside the stator skeleton; wherein, the first rotor assembly is provided with a magnetic member that interacts with the stator magnetic induction coil.

[0008] In some embodiments, the first rotor assembly includes: a permanent magnet having a hollow interior forming a second channel, configured to move axially along the axis of the expansion chamber under the drive of the stator assembly; a first resonant spring, one end of which is fixedly connected to the second housing and the other end of which is fixedly connected to the permanent magnet.

[0009] In some embodiments, the second rotor assembly includes: a rotor skeleton disposed inside the second channel and configured as a cylindrical structure, wherein the connecting rod passes through the permanent magnet to connect the rotor skeleton and the piston head; a rotor magnetic induction coil disposed inside the rotor skeleton and electrically connected to an external drive module; a second resonant spring, one end of which is fixedly connected to the permanent magnet and the other end of which is fixedly connected to the rotor skeleton.

[0010] In some embodiments, the first resonant spring is a leaf spring or a flexible spring.

[0011] In some embodiments, the cold head device of the Stirling refrigerator further includes a hot end heat exchanger, a regenerator, and a cold end heat exchanger connected in sequence, wherein the hot end heat exchanger is disposed in the compression chamber and at an end far from the second housing.

[0012] In some embodiments, the hot end heat exchanger is a shell-and-tube heat exchanger, and a flow channel for a second working fluid is provided inside, and the second working fluid can perform heat exchange with the first working fluid.

[0013] In some embodiments, the regenerator is filled with a porous medium, and the porous medium is a stainless steel wire mesh, stainless steel fibers, or lead shots.

[0014] In some embodiments, the cold head device of the Stirling refrigerator further includes: a third housing sleeved outside the first housing, and jointly defining a third channel with the first housing, wherein the third channel is communicated with the expansion chamber.

[0015] The Stirling refrigerator provided by the embodiments of the present disclosure can achieve the following technical effects:

[0016] The first mover assembly and the first housing define an expansion chamber. Under the action of a driving force, it moves along the axial direction of the expansion chamber towards the first housing, compressing the first working medium to achieve the active movement of the first mover assembly. While the second mover assembly moves towards the first housing in the compression chamber under the action of the driving force, synchronously driving the piston head to move in the first channel, compressing the first working medium to achieve the active movement of the piston head. By controlling the differences in the driving forces and the magnitudes of the movement phases of the first mover assembly and the second mover assembly, the movement displacements and phases of the first mover assembly and the movement displacements and phases of the piston head can be made different. Compared with the existing Stirling refrigerators, the noise and vibration are reduced while the refrigeration efficiency of the refrigerator is improved.

[0017] The above general description and the following description are only exemplary and explanatory and are not intended to limit the present application. Brief Description of the Drawings

[0018] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0019] Figure 1 is a schematic structural diagram of a Stirling refrigerator provided by an embodiment of the present disclosure;

[0020] Figure 2 is an enlarged schematic view of part A of a Figure 1 provided by an embodiment of the present disclosure;

[0021] Figure 3 is an enlarged schematic view of part B of a Figure 1 provided by an embodiment of the present disclosure.

[0022] Reference Numerals:

[0023] 100, Stirling refrigerator cold head device;

[0024] 110, first housing; 120, compression chamber; 130, piston head;

[0025] 140, connecting rod; 150, hot end heat exchanger; 160, regenerator;

[0026] 170, cold end heat exchanger; 180, third housing; 190, third channel;

[0027] 200, double mover linear compression device;

[0028] 210, second housing; 211, first channel;

[0029] 220, first mover assembly; 221, expansion chamber; 222, second channel;

[0030] 223. Permanent magnet; 224. First resonant spring;

[0031] 230. Second mover assembly; 231. Mover skeleton; 233. Second resonant spring;

[0032] 240. Stator assembly; 241. Stator skeleton. Detailed implementation mode

[0033] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be elaborated in detail below with reference to the accompanying drawings. The attached drawings are only for reference and explanation purposes and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0034] In the embodiments of the present disclosure, terms such as "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0035] In the embodiments of the present disclosure, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0036] In addition, the terms "arrange", "connect", "fix" should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0037] Unless otherwise specified, the term "plural" means two or more.

[0038] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0039] The term "and / or" is a description of the association relationship of an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0040] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0041] Figure 1 is a schematic structural diagram of a Stirling refrigerator provided by an embodiment of the present disclosure; Figure 2 is one provided by an embodiment of the present disclosure Figure 1 Schematic enlarged view of part A of

[0042] Combined with Figure 1 , Figure 2 As shown, the embodiments of the present disclosure provide a Stirling refrigerator, including a Stirling refrigerator cold head device 100 and a double-rotor linear compression device 200. The Stirling refrigerator cold head device 100 includes a first housing 110 with a hollow interior forming a compression chamber 120, and a piston head 130 is provided in the compression chamber 120. The double-rotor linear compression device 200 is used to compress the first working medium, and includes a second housing 210, a first rotor assembly 220 and a second rotor assembly 230. The second housing 210 is fixedly connected to the first housing 110, and a first channel 211 coaxial with the compression chamber 120 is provided inside. The first rotor assembly 220 is arranged in the first channel 211, and a second channel 222 is defined inside it, and an expansion chamber 221 is defined with the first housing 110, and is configured to move in the axial direction of the expansion chamber 221 towards the first housing 110 under the action of a driving force. The second rotor assembly 230 is arranged inside the first rotor assembly 220, one end is fixedly connected to the first rotor assembly 220, and the other end is connected to the piston head 130 through a connecting rod, and is configured to move in the second channel 222 inside the first rotor assembly 220 towards the first housing 110 under the action of a driving force, synchronously driving the piston head 130 to move in the compression chamber 120 to compress the first working medium.

[0043] The Stirling refrigerator includes a Stirling refrigerator cold head device 100 and a double-rotor linear compression device 200. The Stirling refrigerator cold head device 100 includes a first housing 110 with a hollow interior to form a first channel 211. A second channel 222 is defined inside the first rotor assembly 220. A piston head 130 is disposed in the compression chamber 120 and filled with a first working fluid. When the piston head 130 reciprocates axially along the compression chamber 120 driven by the second rotor assembly 230, the first working fluid is compressed or expanded. When the first working fluid is compressed, heat can be generated.

[0044] Optionally, the double-rotor linear compression device 200 includes a second housing 210 with a first channel 211 disposed coaxially with the compression chamber 120 inside. The first rotor assembly 220 and the first housing 110 define an expansion chamber 221 and can reciprocate axially along the expansion chamber 221, that is, the first rotor assembly 220 can move axially along the first channel 211 toward the first housing 110 under the action of a driving force to compress the first working fluid.

[0045] Optionally, the second rotor assembly 230 is disposed inside the first rotor assembly 220, fixed to the first rotor assembly 220 at one end, and connected to the piston head 130 through a connecting rod at the other end. The second rotor assembly 230 can move toward the first housing 110 in the second channel 222 under the action of a driving force and synchronously drive the piston head 130 to move in the compression chamber 120, thereby compressing the first working fluid inside the compression chamber 120 to enable it to generate work capacity.

[0046] Optionally, by controlling the different magnitudes of the driving forces of the first rotor assembly 220 and the second rotor assembly 230, the movement phase of the second rotor assembly 230 can be controlled to lag behind the movement phase of the first rotor assembly 220, that is, the movement phase of the piston head 130 can be controlled to lag behind the movement phase of the first rotor assembly 220, so that the movement phase of the first working fluid in the compression chamber 120 can lag behind the movement phase of the first working fluid in the expansion chamber 221, thereby improving the refrigeration performance of the Stirling refrigerator. In addition, adopting the double-rotor linear compression device 200 can also reduce the noise and vibration of the Stirling refrigerator.

[0047] Optionally, the first working fluid is helium.

[0048] With the Stirling refrigerator provided by the embodiments of the present disclosure, an expansion chamber 221 is defined between the first mover assembly 220 and the first housing 110. Under the action of a driving force, it moves along the axis of the expansion chamber 221 towards the first housing 110, compressing the first working fluid to achieve the active movement of the first mover assembly 220. And the second mover assembly 230 moves towards the first housing 110 in the compression chamber 120 under the action of a driving force, synchronously driving the piston head 130 to move in the compression chamber 120, compressing the first working fluid to achieve the active movement of the piston head 130; By controlling the different magnitudes of the driving forces of the first mover assembly 220 and the second mover assembly 230, the movement phases of the first mover assembly 220 and the piston head 130 can be made different. Compared with the existing Stirling refrigerators, the noise and vibration are reduced while the refrigeration efficiency of the refrigerator is improved.

[0049] In some embodiments, the double-mover linear compression device 200 further includes a stator assembly 240. The stator assembly 240 is fixedly arranged on the second housing 210, forms a clearance seal with the first mover assembly 220, and is configured to drive the first mover assembly 220 to reciprocate along the axis of the expansion chamber 221.

[0050] The stator assembly 240 is fixedly arranged on the second housing 210 and can drive the first mover assembly 220 to reciprocate along the axis of the expansion chamber 221. A clearance seal is formed between the stator assembly 240 and the first mover assembly 220, which can make the reciprocating movement of the first mover assembly 220 more stable.

[0051] In some embodiments, the stator assembly 240 includes a stator skeleton 241 and a stator magnetic induction coil. The stator skeleton 241 is configured as a cylindrical structure. The stator magnetic induction coil is arranged inside the cylindrical structure of the stator skeleton 241. Among them, the first mover assembly 220 is provided with a magnetic member that interacts with the stator magnetic induction coil.

[0052] After passing an electric current through the stator magnetic induction coil, an alternating current will be generated, and then an alternating magnetic field will be generated, forming a magnetic circuit in the stator assembly 240. The stator assembly 240 is arranged outside the first mover assembly 220, and the first mover assembly 220 is provided with a magnetic member. When the magnetic circuit attracts the magnetic member, it drives the first mover assembly 220 to move towards the first housing 110. The magnetic member can cut the magnetic circuit. When the magnetic circuit repels the magnetic member, it drives the first mover assembly 220 to move away from the first housing 110. Through the arrangement of the stator magnetic induction coil and the magnetic member, the first mover assembly 220 can be driven to make a linear reciprocating movement in the expansion chamber 221.

[0053] In some embodiments, the first mover assembly 220 includes a permanent magnet 223 and a first resonant spring 224. The permanent magnet 223 has a hollow interior to form a second channel 222. The second channel 222 is coaxially disposed with the first channel 211 and is configured to move axially along the expansion chamber 221 under the drive of the stator assembly 240. One end of the first resonant spring 224 is fixedly connected to the second housing 210, and the other end is fixedly connected to the permanent magnet 223.

[0054] The first mover assembly 220 includes a permanent magnet 223 with a hollow interior forming a second channel 222. The permanent magnet 223 can serve as a magnetic member that interacts with the stator magnetic induction coil, facilitating the drive of the first mover assembly 220 by the stator assembly 240. The permanent magnet 223 has a hollow interior forming a second channel 222. Optionally, the second channel 222 is coaxially disposed with the compression chamber 120. In this way, the coaxiality of the first mover assembly 220, the second mover assembly 230, and the piston head 130 can be improved.

[0055] Optionally, one end of the first resonant spring 224 is fixedly connected to the second housing 210, and the other end is fixedly connected to the permanent magnet 223. In this way, on the one hand, the first resonant spring 224 can provide a certain supporting effect on the hollow permanent magnet, keeping the permanent magnet stable; on the other hand, when the first mover assembly 220 is driven by the stator assembly 240 to move reciprocally, under the action of the first resonant spring 224, the radial wobbling of the first mover assembly 220 in the first channel 211 is reduced, thereby preventing the radial displacement of the first mover assembly 220 in the first channel 211 and ensuring the gap seal between the first mover assembly 220 and the stator assembly 240.

[0056] In some embodiments, the second mover assembly 230 includes a mover skeleton 231, a mover magnetic induction coil, and a second resonant spring 233. The mover skeleton 231 is disposed in the second channel 222 and is configured as a cylindrical structure. Among them, the connecting rod 140 passes through the permanent magnet 223 to connect the mover skeleton 231 and the piston head 130. The mover magnetic induction coil is disposed inside the cylindrical structure of the mover skeleton 231 and is electrically connected to an external drive module. One end of the second resonant spring 233 is fixedly connected to the permanent magnet 223, and the other end is fixedly connected to the mover skeleton 231.

[0057] The second mover assembly 230 includes a mover skeleton 231 with a cylindrical structure and a mover magnetic induction coil disposed inside it. Among them, the mover magnetic induction coil is electrically connected to an external drive module. In this way, when an alternating current is applied to the external drive module, an alternating current will be generated, and then an alternating magnetic field will be generated to form a magnetic circuit. The mover skeleton 231 is disposed outside the mover magnetic induction coil and can cut the magnetic circuit, so that the second mover assembly 230 makes a linear reciprocating motion relative to the first mover assembly in the second channel 222, and then drives the compression head 130 to make a linear reciprocating motion in the compression chamber 120, so that the first working fluid in the compression chamber expands or is compressed.

[0058] Optionally, one end of the second resonance spring 233 is fixedly connected to the permanent magnet 223, and the other end is fixedly connected to the mover skeleton 231. In this way, on the one hand, the second resonance spring 233 can exert a certain supporting effect on the mover skeleton 231 with a cylindrical structure to keep the mover skeleton 231 stable; on the other hand, when the second mover assembly 220 makes a reciprocating motion, under the action of the second resonance spring 233, the radial sway of the second mover assembly 230 in the second channel 222 is reduced, and further the radial displacement of the second mover assembly 230 in the second channel 222 is reduced.

[0059] In some embodiments, the first resonance spring 224 is a leaf spring or a flexible spring. Optionally, the first resonance spring 224 is a leaf spring. In this way, the axial elastic support of the first mover assembly 220 can be ensured.

[0060] Optionally, for the motion of the first mover assembly 220 and the second mover assembly 230, their motion phases conform to the following formula:

[0061] where x is the displacement of the mover, α is the motor specific thrust coefficient, I is the current, i is the imaginary unit, Z m is the mechanical impedance, A is the mover cross-sectional area, Z a is the gas impedance faced by the front of the mover, Z b is the gas impedance faced by the back of the mover. In actual use, it can be calculated according to the actual mechanical impedance and gas impedance. By calculating and adjusting, the displacement of the first mover assembly 220 and the second mover assembly 230 can be obtained, so that the motion of the second mover lags behind the first mover by exactly 90° in phase, thus satisfying the relationship that the motion phase of the first working fluid in the compression chamber 120 lags behind the motion phase of the first working fluid in the expansion chamber 221 by 90°, and improving the overall efficiency of the Stirling refrigerator.

[0062] In some embodiments, the cold head device 100 of the Stirling refrigerator further includes a hot end heat exchanger 150, a regenerator 160, and a cold end heat exchanger 170 that are connected in sequence. Among them, the hot end heat exchanger 150 is disposed in the compression chamber 120 and at a position away from the end of the second housing 210.

[0063] Optionally, after the first working fluid is compressed by the piston head 130 in the compression chamber 120 to generate heat, it is pushed into the hot end heat exchanger 150. After undergoing an exothermic process, it is pushed into the regenerator 160 to continue cooling, and then is pushed into the cold end heat exchanger 170 to transfer the cold quantity contained therein to the place where cold quantity is required in the outside world, thereby achieving the purpose of refrigeration.

[0064] In some embodiments, the hot end heat exchanger 150 is a shell-and-tube heat exchanger, and a fluid passage for the second working fluid is provided inside, and the second working fluid can perform heat exchange with the first working fluid.

[0065] Optionally, a fluid passage is provided in the hot end heat exchanger 150, and the second working fluid flows in the fluid passage. After the first working fluid is compressed by the piston head 130 in the compression chamber 120 to generate heat, it is pushed into the hot end heat exchanger 150 to transfer the heat to the second working fluid in the hot end heat exchanger 150. Preferably, the second working fluid is water, and the water flows in the fluid passage to take away the heat of the first working fluid. After the first working fluid and the second working fluid perform heat exchange, it is pushed into the regenerator 160. In the regenerator 160, the temperature of the first working fluid continues to decrease. Then it is pushed into the cold end heat exchanger 170 to transfer the cold quantity therein to the place where cold quantity is required in the outside world, thereby achieving the purpose of refrigeration. Optionally, the cold end heat exchanger 170 is provided with a cold end head for transferring cold quantity to the outside.

[0066] In some embodiments, the inside of the regenerator 160 is filled with a porous medium, and the porous medium is a stainless steel wire mesh, stainless steel fiber, or lead shot.

[0067] Figure 3 is an enlarged schematic view of part B provided by an embodiment of the present disclosure. Figure 1 of.

[0068] Combined with Figure 1 , Figure 3 As shown, in some embodiments, the cold head device 100 of the Stirling refrigerator further includes a third housing 180. The third housing 180 is sleeved outside the first housing 110, and together with the first housing 110, a third channel 190 is defined, wherein the third channel 190 is communicated with the expansion chamber 221. In this way, after the first working fluid releases cold quantity in the cold end heat exchanger, it can flow back into the expansion chamber 221 through the third channel 190, so as to work in a reciprocating cycle.

[0069] In the embodiments of the present disclosure, the first working fluid in the expansion chamber 221 moves with the alternating motion of the first mover assembly 220, and the first working fluid in the compression chamber 120 can move with the alternating motion of the second mover assembly 230. By controlling the difference in the magnitudes of the driving forces of the first mover assembly 220 and the second mover assembly 230, the motion of the second mover assembly 230 lags behind that of the first mover assembly 220, and further, the motion phase of the first working fluid in the compression chamber 120 lags behind the motion phase of the first working fluid in the expansion chamber 221, thereby improving the refrigeration performance of the Stirling refrigerator.

[0070] The above description and the drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A Stirling refrigerator, comprising a Stirling refrigerator cold head device (100), which includes a first housing (110) with a hollow interior forming a compression chamber (120), and a piston head (130) is arranged in the compression chamber (120), characterized in that, The Stirling refrigerator further includes a double-rotor linear compression device (200) for compressing the first working fluid. The double-rotor linear compression device (200) includes: A second housing (210) fixedly connected to the first housing (110) and having a first channel (211) coaxially arranged with the compression chamber (120) therein; A first rotor assembly (220) disposed in the first channel (211) and defining an expansion chamber (221) between it and the first housing (110). It is configured to move along the axial direction of the expansion chamber (221) towards the first housing (110) under the action of a driving force to compress the first working fluid, so as to realize the active movement of the first rotor assembly. A second channel (222) is defined inside the first rotor assembly (220); A second rotor assembly (230) disposed in the second channel inside the first rotor assembly (220). One end is fixedly connected to the first rotor assembly (220), and the other end is connected to the piston head (130) through a connecting rod (140). It is configured to synchronously drive the piston head (130) to move in the compression chamber (120) towards the first housing (110) inside the first rotor assembly (220) under the action of a driving force, so as to compress the first working fluid, so as to realize the active movement of the piston head (130).

2. The Stirling refrigerator according to claim 1, wherein The double-rotor linear compression device (200) further includes: A stator assembly (240) fixedly arranged on the second housing (210), forming a clearance seal with the first rotor assembly (220), and configured to drive the first rotor assembly (220) to reciprocate along the axial direction of the expansion chamber (221).

3. The Stirling refrigerator according to claim 2, characterized in that, The stator assembly (240) includes: A stator skeleton (241) constructed as a cylindrical structure; A stator magnetic induction coil disposed inside the stator skeleton (241); Wherein, the first rotor assembly (220) is provided with a magnetic member interacting with the stator magnetic induction coil.

4. The Stirling refrigerator according to claim 3, wherein The first rotor assembly (220) includes: A permanent magnet (223) with a hollow interior forming a second channel (222), configured to move along the axial direction of the expansion chamber (221) under the drive of the stator assembly (240); A first resonant spring (224) with one end fixedly connected to the second housing (210) and the other end fixedly connected to the permanent magnet (223); Wherein, the second channel (222) is coaxially arranged with the first channel (211), and the second channel (222) is coaxially arranged with the compression chamber (120).

5. The Stirling refrigerator according to claim 4, characterized in that, The second rotor assembly (230) includes: A rotor skeleton (231) disposed in the second channel (222), constructed as a cylindrical structure. Wherein, the connecting rod (140) passes through the permanent magnet (223) to connect the rotor skeleton (231) and the piston head (130); A rotor magnetic induction coil disposed inside the rotor skeleton (231) and electrically connected to an external drive module; The second resonant spring (233) has one end fixedly connected to the permanent magnet (223) and the other end fixedly connected to the mover skeleton (231).

6. The Stirling cryocooler according to claim 4, wherein the first resonant spring (224) is a leaf spring or a flexible spring.

7. The Stirling refrigerator according to claim 1, characterized in that, The cold head device (100) of the Stirling cryocooler further includes a hot end heat exchanger (150), a regenerator (160), and a cold end heat exchanger (170) connected in sequence. Among them, the hot end heat exchanger (150) is disposed in the compression chamber (120) and at an end away from the second housing (210).

8. The Stirling cryocooler according to claim 7, wherein the hot end heat exchanger (150) is a shell-and-tube heat exchanger, and a fluid passage for the second working fluid is provided inside, and the second working fluid can exchange heat with the first working fluid.

9. The Stirling cryocooler according to claim 7, wherein the regenerator (160) is filled with a porous medium, and the porous medium is stainless steel wire mesh, stainless steel fiber, and lead shot.

10. The Stirling refrigerator according to claim 7, characterized in that, The cold head device (100) of the Stirling cryocooler further includes: A third housing (180) sleeved outside the first housing (110) and jointly defining a third channel (190) with the first housing (110), wherein the third channel (190) is communicated with the expansion chamber (221).

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