A refrigeration machine

Abstract

The utility model discloses a refrigerating machine, the refrigerating machine includes compressor and expander, and the compressor includes cylinder seat, and the expander includes push -and -go subassembly and cold finger, and the cold finger is fixedly connected with the cylinder seat of compressor, and the compression cavity of cylinder seat is communicated with the inner chamber of cold finger through the air hole, and push -and -go subassembly is located in the inner chamber of cold finger, and the one end of push -and -go subassembly near compressor is connected with first auxiliary magnetic steel, and the one side of the main magnetic steel of mobile subassembly near expander is equipped with second auxiliary magnetic steel, and the main magnetic steel and second auxiliary magnetic steel are arranged in series along the axial direction to form first magnetic spring, and second auxiliary magnetic steel and first auxiliary magnetic steel are arranged to be opposite along the radial direction to form second magnetic spring. The refrigerating machine adopts compressor and expander integrated layout, introduces magnetic spring technology, and the magnetic spring of expander and compressor is mutually embedded, under satisfying performance and reliability requirement, makes the volume and weight of complete machine further reduce, and the structure is simpler, thereby realizes light weight low -cost design.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration technology, specifically relating to a linear Stirling refrigeration machine. Background Technology

[0002] Linear Stirling refrigerators are widely used in civilian and military equipment such as infrared thermal imagers, infrared forward-looking and night vision devices, missile guidance systems, and space applications. The linear compressor, as the core component of the Stirling refrigerator, is the power source that maintains the normal flow of the working fluid. Currently, with increasingly complex systems and more compact internal spaces, the requirements for the size and weight of the refrigerators are becoming increasingly stringent. Therefore, the miniaturization and lightweight design of refrigerators has become a key focus and challenge in the development of cooled infrared detector technology.

[0003] Currently, integrated or separate Stirling refrigerators typically use mechanical springs to provide axial stiffness to ensure that the refrigerator can operate stably under various working conditions. When mechanical springs are used for support, the limited reciprocating stroke of the springs will occupy axial space, increasing the axial dimension of the refrigerator and making it difficult to further miniaturize the refrigerator design. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a refrigeration machine.

[0005] The technical solution of this utility model is implemented as follows: This utility model discloses a refrigeration machine, including a compressor and an expander. The compressor includes a cylinder seat, a stator assembly, and a mover assembly. The expander includes a pushing assembly and a cold finger. The cold finger is fixedly connected to the cylinder seat of the compressor. The compression chamber of the cylinder seat communicates with the inner cavity of the cold finger through a vent hole. The pushing assembly is located inside the inner cavity of the cold finger. A first auxiliary magnet is connected to one end of the pushing assembly near the compressor. A second auxiliary magnet is provided on the side of the main magnet of the mover assembly near the expander. The main magnet and the second auxiliary magnet are arranged side by side along the axial direction to form a first magnetic spring. The second auxiliary magnet and the first auxiliary magnet are arranged radially inward and outward relative to each other to form a second magnetic spring.

[0006] Furthermore, the stator assembly includes a stator frame, a stator coil, and an external soft magnet. The stator coil and the external soft magnet are both fixed on the stator frame. The stator frame is fixedly connected to the cylinder seat. The first end of the stator frame is fixedly connected to the cylinder seat, and the second end of the stator frame is fixedly connected to the end cover.

[0007] Furthermore, the mover assembly also includes a compression piston and a magnet frame. The main magnet is fixed on the magnet frame, the magnet frame is connected to the compression piston, the compression piston slides and seals with the compression chamber of the cylinder seat, the magnet frame is located inside the stator frame, and a gap is provided between the outer wall of the magnet frame and the inner wall of the stator frame.

[0008] Furthermore, an internal soft magnet is fixed on the cylinder seat.

[0009] Furthermore, the second auxiliary magnet is spaced apart outside the first auxiliary magnet, and the second auxiliary magnet and the first auxiliary magnet are centered on the same axis.

[0010] Furthermore, the main magnet, the first auxiliary magnet, and the second auxiliary magnet are all radially magnetized, and the magnetization directions are consistent.

[0011] Furthermore, a third auxiliary magnet is provided on the side of the main magnet away from the expander, and the main magnet and the third auxiliary magnet are arranged side by side along the axial direction to form a third magnetic spring.

[0012] Furthermore, the main magnet, the first auxiliary magnet, the second auxiliary magnet, and the third auxiliary magnet are all radially magnetized, and the magnetization directions are consistent.

[0013] Furthermore, the second auxiliary magnet and the third auxiliary magnet are respectively fixed on the stator frame of the stator assembly.

[0014] Furthermore, the second auxiliary magnet is fixed on the first auxiliary magnet support frame, and the third auxiliary magnet is fixed on the second auxiliary magnet support frame. The first auxiliary magnet support frame and the second auxiliary magnet support frame are respectively fixed on the inner wall of the stator frame.

[0015] Furthermore, the pushing assembly includes a cold accumulator and a plug. The cold accumulator is slidably sealed to the cold finger and divides the inner cavity of the cold finger into a cold cavity and a hot cavity. The compression cavity of the cylinder seat is connected to the hot cavity of the cold finger through a vent hole. The plug is fixedly connected to one end of the cold accumulator and located in the hot cavity of the cold finger. The first auxiliary magnet is fixed to the plug.

[0016] Furthermore, the outer wall of the cold accumulator is provided with a self-lubricating layer.

[0017] Furthermore, the axis of the accumulator is on the same straight line as the axis of the compression piston.

[0018] This utility model has at least the following beneficial effects: This utility model proposes a miniature lightweight linear Stirling refrigerator. The refrigerator adopts an integrated layout of compressor and expander, introduces magnetic spring technology, and the magnetic springs of expander and compressor are interlocked, realizing full integration of refrigerator. While meeting performance and reliability requirements, the overall size and weight of the machine are further reduced, the structure is simpler, and thus a lightweight and low-cost design is achieved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the refrigeration machine provided in an embodiment of the present utility model.

[0021] In the attached diagram, 1 is the cold finger, 2 is the accumulator shell, 3 is the self-lubricating layer, 4 is the wire mesh, 5 is the plug, 6 is the first auxiliary magnet, 7 is the second auxiliary magnet, 8 is the main magnet, 9 is the outer soft magnet, 10 is the stator coil, 11 is the third auxiliary magnet, 12 is the cylinder seat, 13 is the stator frame, 14 is the magnet frame, 15 is the compression piston, 16 is the end cap, 17 is the vent hole, 18 is the inner soft magnet, 19 is the first auxiliary magnet support frame, and 20 is the second auxiliary magnet support frame. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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 this utility model.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this utility model, unless otherwise stated, "a plurality of" or "several" means two or more.

[0025] See Figure 1This utility model provides a linear Stirling refrigerator, including a compressor and an expander. The compressor includes a cylinder base 12, a stator assembly, and a mover assembly. The expander includes a pusher assembly and a cooling finger 1. The cooling finger 1 of the expander is fixedly connected to the cylinder base 12 of the compressor. The compression chamber of the cylinder base 12 communicates with the inner cavity of the cooling finger 1 through a vent hole 17. The pusher assembly is located inside the inner cavity of the cooling finger 1. A first auxiliary magnet 6 is connected to the end of the pusher assembly near the compressor. A second auxiliary magnet 7 is provided on the side of the main magnet 8 of the mover assembly near the expander. The main magnet 8 and the second auxiliary magnet 7 are arranged side by side along the axial direction to form a first magnetic spring. The second auxiliary magnet 7 and the first auxiliary magnet 6 are arranged radially inward and outward to form a second magnetic spring. The first magnetic spring restricts the movement of the main magnet towards the expander.

[0026] The first auxiliary magnet 6 and the second auxiliary magnet 7 form the axial spring force of the pushing assembly, which continuously pushes the assembly to maintain stable axial reciprocating motion.

[0027] In some embodiments, the second auxiliary magnet 7 is spaced apart from the first auxiliary magnet 6, with the second auxiliary magnet and the first auxiliary magnet centered on the same axis. There is a radial gap between the second auxiliary magnet 7 and the first auxiliary magnet 6. The main magnet 8, the first auxiliary magnet 6, and the second auxiliary magnet 7 are all radially magnetized, and the magnetization directions are consistent.

[0028] In other embodiments, a third auxiliary magnet 11 is provided on the side of the main magnet 8 away from the expander, and the main magnet 8 and the third auxiliary magnet 11 are arranged side by side along the axial direction to form a third magnetic spring. The third magnetic spring restricts the movement of the main magnet away from the expander.

[0029] In a preferred embodiment, the present invention restricts the axial movement of the main magnet by means of the cooperation of the first magnetic spring and the third magnetic spring, so that the main magnet 8, the second auxiliary magnet 7 and the third auxiliary magnet 11 form the motor axial spring force, and maintain the stable axial reciprocating motion of the compression piston 15.

[0030] The main magnet 8, the second auxiliary magnet 7, and the third auxiliary magnet 11 have coincident (i.e., coaxial) axes and are arranged sequentially along the axial direction (such as adjacent to each other), with adjacent surfaces maintaining a certain axial gap, forming a "parallel axial" spatial relationship.

[0031] In some embodiments, the outer diameter of the main magnet 8 is greater than or equal to the outer diameter of the second auxiliary magnet 7 and the outer diameter of the third auxiliary magnet 11, and the inner diameter of the main magnet 8 is smaller than the inner diameter of the second auxiliary magnet 7 and the inner diameter of the third auxiliary magnet 11.

[0032] In some embodiments, the second auxiliary magnet 7 and the third auxiliary magnet 11 have the same outer diameter. The second auxiliary magnet 7 and the third auxiliary magnet 11 have the same inner diameter.

[0033] In some embodiments, the second auxiliary magnet 7 and the third auxiliary magnet 11 have the same axial length.

[0034] In some embodiments, the axial length of the first auxiliary magnet 6 is less than the axial length of the second auxiliary magnet 7. The outer diameter of the first auxiliary magnet 6 is less than the inner diameter of the second auxiliary magnet 7.

[0035] In some embodiments, the main magnet 8, the first auxiliary magnet 6, the second auxiliary magnet 7, and the third auxiliary magnet 11 are in a ring shape. The main magnet 8, the first auxiliary magnet 6, the second auxiliary magnet 7, and the third auxiliary magnet 11 can be complete ring magnets or can be composed of multiple magnet segments spliced ​​together.

[0036] In a preferred embodiment, the main magnet 8, the first auxiliary magnet 6, the second auxiliary magnet 7, and the third auxiliary magnet 11 each comprise multiple tile-shaped magnets, which are arranged in a ring (i.e., multiple tile-shaped magnets are arranged along the circumference to form a ring structure). In one embodiment, the main magnet 8, the first auxiliary magnet 6, the second auxiliary magnet 7, and the third auxiliary magnet 11 are each composed of 6 tile-shaped magnets.

[0037] In some embodiments, the main magnet 8, the first auxiliary magnet 6, the second auxiliary magnet 7, and the third auxiliary magnet 11 are all radially magnetized in the same direction. This radial magnetization, along with the consistent magnetization direction, creates an axial magnetic spring effect between the main magnet 8, the second auxiliary magnet 7, and the third auxiliary magnet 11. This ensures stable reciprocating operation of the main magnet and the compression piston, while also reducing the risk of compressor collisions in long-stroke or high-overload applications. As the distance between the main magnet 8 and the second or third auxiliary magnet 7 or 11 increases dramatically, the risk of cylinder collision is effectively reduced. Simultaneously, with the second auxiliary magnet 7 fixed and the first auxiliary magnet 6 reciprocating under aerodynamic force, the interaction of their magnetic fields creates a stable axial restoring force, ensuring stable operation of the pushing assembly.

[0038] In some embodiments, the second auxiliary magnet 7 and the third auxiliary magnet 11 are respectively fixed on the stator frame 13 of the stator assembly. In a preferred embodiment, the second auxiliary magnet 7 is fixed to the first end of the inner wall of the stator frame 13, and the third auxiliary magnet 11 is fixed to the second end of the inner wall of the stator frame 13. The second auxiliary magnet 7, the third auxiliary magnet 11 and the main magnet 8 are axially spaced.

[0039] In some embodiments, the second auxiliary magnet 7 is fixed to the first auxiliary magnet support frame 19, and the third auxiliary magnet 11 is fixed to the second auxiliary magnet support frame 20. The first auxiliary magnet support frame 19 and the second auxiliary magnet support frame 20 are respectively fixed to the inner wall of the stator frame 13. Specifically, the second auxiliary magnet support frame 20 is fixed to one end of the inner wall of the stator frame 13, and the second auxiliary magnet support frame 20 is fixed to the other end of the inner wall of the stator frame 13.

[0040] In some embodiments, the first end of the stator frame 13 is fixedly connected to the cylinder seat 12, and the second end of the stator frame 13 is fixedly connected to the end cover 16.

[0041] In some embodiments, the mover assembly includes a main magnet 8, a compression piston 15, and a magnet frame 14. The main magnet 8 is fixed to the magnet frame 14, and the magnet frame 14 is connected to the compression piston 15. The compression piston 15 is slidably sealed to the compression chamber of the cylinder seat 12. The stator assembly includes a stator frame 13, a stator coil 10, and an outer soft magnet 9. The stator coil 10 and the outer soft magnet 9 are both fixed to the stator frame 13. The stator frame 13 is fixedly connected to the cylinder seat 12. The magnet frame 14 is located inside the stator frame 13, and a gap is provided between the outer wall of the magnet frame 14 and the inner wall of the stator frame 13. An inner soft magnet 18 is fixed on the cylinder seat 12.

[0042] In some embodiments, the main magnet 8 is fixed to the outer wall of the magnet frame 14.

[0043] In some embodiments, the stator coil 10 and the outer soft magnet 9 are both fixed on the outer wall of the stator frame 13.

[0044] The compression piston 15 extends from the second end of the compression chamber of the cylinder seat 12 into the compression chamber of the cylinder seat 12 and slides into the compression chamber of the cylinder seat 12. The first end of the compression chamber of the cylinder seat 12 is connected to the inner cavity of the cold finger 1 through the vent hole 17.

[0045] In some embodiments, the outer wall of the compression piston 15 is provided with a self-lubricating coating, and the compression piston 15 achieves a dynamic sealing effect with the cylinder cavity. The self-lubricating coating on the surface of the compression piston 15 achieves a dynamic sealing effect with the cylinder bore during movement.

[0046] In some embodiments, the pushing assembly includes a cold accumulator and a plug 5. The cold accumulator is slidably sealed to the cold finger 1 and divides the inner cavity of the cold finger 1 into a cold cavity and a hot cavity. The compression cavity of the cylinder seat 12 is connected to the hot cavity of the cold finger 1 through a vent hole 17. The plug 5 is fixedly connected to one end of the cold accumulator and located in the hot cavity of the cold finger 1. The first auxiliary magnet 6 is fixed on the plug 5.

[0047] In some embodiments, the cold storage unit includes a cold storage housing 2 and a wire mesh 4 filled inside the cold storage housing 2.

[0048] In some embodiments, the cylinder seat 12 includes a base and a cylinder. The cold finger 1 of the expander is fixedly connected to the base of the cylinder seat 12. A portion of the cylinder of the cylinder seat 12 extends into the hot cavity of the cold finger 1. The cold finger 1 is provided with a through hole for the cylinder of the cylinder seat 12 to extend into. Of course, this invention is not limited to the above embodiments. The cylinder of the cylinder seat 12 may not extend into the hot cavity of the cold finger 1; the compression chamber of the cylinder and the hot cavity of the cold finger 1 can be connected through a vent hole 17. An inner soft magnet 18 is sleeved on the outer wall of the cylinder.

[0049] In some embodiments, the outer wall of the cold accumulator is provided with a self-lubricating layer 3.

[0050] Preferably, a self-lubricating layer 3 is provided at both ends of the outer wall of the cold accumulator. The self-lubricating material at both ends of the cold accumulator can reduce the friction between the cold accumulator shell 2 and the cold finger 1 while achieving dynamic sealing, so as to realize the stable and reliable operation of the refrigeration machine.

[0051] In some embodiments, the axis of the cold accumulator is on the same straight line as the axis of the compression piston 15.

[0052] In some embodiments, the centerlines of the accumulator, the compression piston 15, and the vent 17 are located on the same straight line. This alignment allows for a more direct flow path of gas between the compression chamber of the cylinder, the hot chamber of the cold finger 1, and the vent, reducing airflow detours and resistance. It also ensures more uniform gas flow through the accumulator, facilitating thorough heat exchange with the medium within the accumulator and improving heat exchange efficiency. Finally, this alignment helps to ensure a uniform distribution of gas pressure on the piston, reducing uneven loading during piston movement, minimizing mechanical wear, and guaranteeing the stability and reliability of the compression process.

[0053] In some embodiments, the cylinder base 12, stator frame 13, magnet frame 14, first magnet support frame, second magnet support frame, end cap 16, plug 5, and cold finger 1 are all made of non-magnetic materials. The purpose is to eliminate the interference of external structures on the magnetic field, ensure that the magnetic field characteristics, repulsive force and energy efficiency of core magnetic components such as magnets and magnetic springs are not affected, and ensure the stability and effectiveness of the magnetic circuit design.

[0054] This utility model relates to a miniature, lightweight linear Stirling refrigerator, such as... Figure 1As shown, the refrigeration unit adopts a monolithic structure, and the compressor is driven by a moving magnet linear motor. The second auxiliary magnet 7 is first glued to the first magnet support frame. The second auxiliary magnet 7 and the first magnet support frame are then fixed to one end of the stator frame 13. The stator frame 13 is then fixed to the cylinder seat 12. Next, the compression piston 15 and the magnet frame 14 are placed in the cylinder. The third auxiliary magnet 11 and the second magnet support frame are then fixed to the other end of the stator frame 13. Finally, the end cover 16 and the stator frame 13 are fixed to complete the assembly of the compressor section.

[0055] The first auxiliary magnet 6 is fixed to the plug 5. After the wire mesh 4 is filled into the cold accumulator shell 2, self-lubricating material is bonded or sprayed onto both ends of the outer wall of the cold accumulator shell 2. The gap between the material and the cold finger 1 is maintained at a certain value to achieve a dynamic sealing effect. Finally, the plug 5 is connected to the cold accumulator shell 2 to complete the assembly of the pushing assembly. After the pushing assembly is assembled, it is placed into the cold finger 1. Finally, the cold finger 1 is fixed to the cylinder seat 12 to complete the assembly of the refrigeration unit.

[0056] After AC current is applied to the coil, the main magnet 8 drives the compression piston 15 to reciprocate within the cylinder seat 12. The working fluid is compressed in the compression chamber and enters the expander through the vent 17. The pushing assembly reciprocates under the action of aerodynamic force. The working fluid completes heat exchange in the accumulator and finally expands at the cold end to achieve refrigeration. During the operation of the refrigeration unit, the main magnet 8, the second auxiliary magnet 7, and the third auxiliary magnet 11 form an axial spring force to maintain the stable axial reciprocating motion of the compression piston 15. The first auxiliary magnet 6 and the second auxiliary magnet 7 form an axial spring force to continuously maintain the stable axial reciprocating motion of the pushing assembly.

[0057] This invention proposes a miniaturized and lightweight linear Stirling refrigerator. The refrigerator achieves a miniaturized and lightweight design by employing magnetic spring technology and coupling the magnetic springs of the compressor and expander.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A refrigeration machine, comprising a compressor and an expander, wherein the compressor includes a cylinder base, a stator assembly, and a rotor assembly, and the expander includes a pusher assembly and a cooling finger, characterized in that: The cold finger is fixedly connected to the cylinder seat of the compressor. The compression chamber of the cylinder seat is connected to the inner cavity of the cold finger through a vent hole. The pushing assembly is located inside the inner cavity of the cold finger. A first auxiliary magnet is connected to one end of the pushing assembly near the compressor. A second auxiliary magnet is provided on the side of the main magnet of the moving assembly near the expander. The main magnet and the second auxiliary magnet are arranged side by side along the axial direction to form a first magnetic spring. The second auxiliary magnet and the first auxiliary magnet are arranged radially inward and outward relative to each other to form a second magnetic spring.

2. The refrigeration machine as described in claim 1, characterized in that: The second auxiliary magnet is spaced apart outside the first auxiliary magnet, and the second auxiliary magnet and the first auxiliary magnet are centered on the same axis.

3. The refrigeration machine as described in claim 1, characterized in that: The main magnet, the first auxiliary magnet, and the second auxiliary magnet are all radially magnetized, and the magnetization directions are consistent.

4. The refrigeration machine as described in claim 1, characterized in that: A third auxiliary magnet is provided on the side of the main magnet away from the expander, and the main magnet and the third auxiliary magnet are arranged side by side along the axial direction to form a third magnetic spring.

5. The refrigeration machine as described in claim 4, characterized in that: The main magnet, the first auxiliary magnet, the second auxiliary magnet, and the third auxiliary magnet are all radially magnetized, and the magnetization direction is consistent.

6. The refrigeration machine as described in claim 4, characterized in that: The second auxiliary magnet and the third auxiliary magnet are respectively fixed on the stator frame of the stator assembly.

7. The refrigeration machine as described in claim 6, characterized in that: The second auxiliary magnet is fixed on the first auxiliary magnet support frame, and the third auxiliary magnet is fixed on the second auxiliary magnet support frame. The first auxiliary magnet support frame and the second auxiliary magnet support frame are respectively fixed on the inner wall of the stator frame.

8. The refrigeration machine as described in claim 1, characterized in that: The pushing assembly includes a cold accumulator and a plug. The cold accumulator is slidably sealed to the cold finger and divides the inner cavity of the cold finger into a cold cavity and a hot cavity. The compression cavity of the cylinder seat is connected to the hot cavity of the cold finger through a vent hole. The plug is fixedly connected to one end of the cold accumulator and located in the hot cavity of the cold finger. The first auxiliary magnet is fixed to the plug.

9. The refrigeration machine as described in claim 8, characterized in that: The outer wall of the cold accumulator is equipped with a self-lubricating layer.

10. The refrigeration machine as described in claim 8, characterized in that: The axis of the accumulator is on the same straight line as the axis of the compression piston.

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