Linear compressor and linear stirling refrigerator

Abstract

The utility model belongs to compressor technical field, concretely provides a linear compressor, including stator subassembly, cylinder, rotor subassembly, stator subassembly includes stator framework and respectively the coil, first magnetic ring, second magnetic ring of setting in stator framework outside, first magnetic ring and second magnetic ring are arranged respectively in coil both sides along the axial direction, cylinder is located in stator framework, rotor subassembly includes rotor framework, piston, first permanent magnet and third magnetic ring, piston one end swing splices in cylinder, the other end is connected with rotor framework, first permanent magnet and third magnetic ring all install on rotor framework, and first permanent magnet and third magnetic ring swing setting between stator framework inner wall and cylinder, third magnetic ring is arranged between first magnetic ring and second magnetic ring along the axial direction. Linear compressor adopts rotor framework as the moving part, utilizes the interaction between magnetic ring pair to replace plate spring and drive piston reciprocating motion relative to cylinder, reduces the axial dimension of compressor.

Description

Technical Field

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

[0002] With the development of technology, linear Stirling refrigerators are increasingly widely used in civilian and military equipment such as infrared thermal imagers, infrared forward-looking and night vision systems, missile guidance, and space applications. The linear compressor is the core component of a linear Stirling refrigerator, directly affecting the overall performance of the machine. As technology advances, the dimensional requirements for refrigerators are becoming increasingly stringent. Conventional compressors use leaf springs as the mechanical stiffness source for moving parts. The leaf springs move together with the moving part, utilizing the spring's rebound force to ensure the spring's return. Therefore, the design must allow for space for the leaf spring's movement, preventing further compression of the compressor's axial length. Utility Model Content

[0003] The purpose of this invention is to overcome the problem that the existing technology uses leaf springs as the source of mechanical stiffness for moving parts in compressors, which cannot meet the requirements for miniaturizing refrigeration machines.

[0004] Therefore, this utility model provides a linear compressor, including a stator assembly, a cylinder, and a mover assembly; the stator assembly includes a stator frame and a coil, a first magnetic ring, and a second magnetic ring respectively sleeved outside the stator frame; the first magnetic ring and the second magnetic ring are respectively disposed on both sides of the coil along the axial direction; the cylinder is located inside the stator frame; the mover assembly includes a mover frame, a piston, a first permanent magnet, and a third magnetic ring; one end of the piston is movably inserted into the cylinder, and the other end is connected to the mover frame; the first permanent magnet and the third magnetic ring are both mounted on the mover frame, and the first permanent magnet and the third magnetic ring are movably disposed between the inner wall of the stator frame and the cylinder; the third magnetic ring is disposed axially between the first magnetic ring and the second magnetic ring.

[0005] Specifically, the first magnetic ring, the second magnetic ring, and the third magnetic ring are all axially magnetized and have the same magnetization direction; the first permanent magnet is radially magnetized.

[0006] Specifically, the aforementioned mover assembly also includes a second permanent magnet; the second permanent magnet is mounted on the mover frame, and the first permanent magnet and the second permanent magnet are respectively arranged on both sides of the third magnetic ring along the axial direction.

[0007] Specifically, the second permanent magnet is radially magnetized.

[0008] Specifically, in the initial state, the first magnetic ring and the second magnetic ring are symmetrically arranged on both sides of the axial direction of the third magnetic ring.

[0009] Specifically, the first magnetic ring and the second magnetic ring mentioned above have the same size.

[0010] Specifically, in the initial state, the third magnetic ring is located radially between the inner wall of the stator frame and the coil.

[0011] Specifically, the cylinder outer sleeve is provided with an inner soft magnet; the first permanent magnet and the third magnetic ring are movably disposed between the inner wall of the stator frame and the inner soft magnet.

[0012] Specifically, the stator assembly also includes an outer soft magnet; the outer soft magnet is wrapped around the coil.

[0013] Specifically, both the first magnetic ring and the second magnetic ring are sleeved on the outer soft magnet.

[0014] Specifically, the linear compressor also includes a base; the cylinder is mounted on the base.

[0015] Specifically, the linear compressor also includes an end cover; one end of the stator frame is connected to the end face of the base, and the other end is connected to the end cover; an internal cavity is formed between the stator frame, the base, and the end cover.

[0016] Specifically, the stator frame is covered with an outer shell; one end of the outer shell is fixedly connected to the base, and the other end is fixedly connected to the end cover.

[0017] This invention also provides a linear Stirling refrigerator, which employs any of the linear compressors described above.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] The linear compressor provided by this utility model uses a moving frame as the moving part. It uses the interaction between magnetic ring pairs to replace the leaf spring to drive the piston to reciprocate relative to the cylinder, compressing the gas to the expander side and driving the expander to move, thereby achieving refrigeration and reducing the axial dimension of the compressor.

[0020] The present invention will be further described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a linear compressor in one implementation method.

[0022] Figure 2 This is a comparison diagram of the axial forces generated by the interaction of the magnetic rings.

[0023] Explanation of reference numerals in the attached drawings: 1. End cap; 2. Stator frame; 3. First magnetic ring; 4. Coil; 5. Second magnetic ring; 6. Outer soft magnet; 7. Cylinder; 8. Compression chamber; 9. Airflow channel; 10. Inner soft magnet; 11. Base; 12. Mover frame; 13. Piston; 14. First permanent magnet; 15. Third magnetic ring; 16. Second permanent magnet; 17. Outer shell;

[0024] A. Traditional electromagnetic stiffness; B. Electromagnetic stiffness of this utility model. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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" means two or more.

[0028] Reference Figure 1This utility model provides a linear compressor, including a stator assembly, a cylinder 7, and a mover assembly. The stator assembly includes a stator frame 2 and coils 4, a first magnetic ring 3, and a second magnetic ring 5 respectively sleeved outside the stator frame 2. The first magnetic ring 3 and the second magnetic ring 5 are respectively arranged on both sides of the coil 4 along the axial direction. The cylinder 7 is located inside the stator frame 2. The mover assembly includes a mover frame 12, a piston 13, a first permanent magnet 14, and a third magnetic ring 15. One end of the piston 13 is movably inserted into the cylinder 7, and the other end is connected to the mover frame 12. The first permanent magnet 14 and the third magnetic ring 15 are both mounted on the mover frame 12, and the first permanent magnet 14 and the third magnetic ring 15 are movably arranged between the inner wall of the stator frame 2 and the cylinder 7. The third magnetic ring 15 is arranged axially between the first magnetic ring 3 and the second magnetic ring 5, and the third magnetic ring 15, the first magnetic ring 3, and the second magnetic ring 5 are arranged coaxially. Preferably, in the initial state, the first magnetic ring 3 and the second magnetic ring 5 are symmetrically arranged on both sides of the third magnetic ring 15, so that the force on the mover assembly is more uniform. In the initial state, the third magnetic ring 15 corresponds to the position of the coil 4, that is, in the radial direction, the third magnetic ring 15 is located between the inner wall of the stator frame 2 and the coil 4.

[0029] When the coil 4 is energized with alternating current, it generates a magnetic field. The first permanent magnet 14 is subjected to force, which drives the piston 13 and the third magnetic ring 15 to move together via the mover frame 12. At this time, the third magnetic ring 15, located in the middle, interacts with the first magnetic ring 3 and the second magnetic ring 5 to generate axial force. When the mover assembly moves to one side, the first magnetic ring 3 and the second magnetic ring 5 interact with the third magnetic ring 15 to generate axial force in the opposite direction, thus replacing the function of the leaf spring. Through the above reciprocating motion, the chamber between the piston 13 and the cylinder 7 will expand and compress, thereby driving the expander to move and achieving refrigeration.

[0030] Specifically, the first magnetic ring 3, the second magnetic ring 5, and the third magnetic ring 15 are all axially magnetized and have the same magnetization direction. The first magnetic ring 3 and the second magnetic ring 5 have the same size, so that the third magnetic ring 15 is subjected to uniform force on both sides of the axial direction during the movement. The first permanent magnet 14 is radially magnetized.

[0031] Traditional electromagnetic springs use magnetic rings on both sides of the rotor to generate axial stiffness through the repulsive force between the rings. The magnetic rings in this linear compressor differ from the traditional principle of repulsion between rings and attraction between rings. The magnetic ring pair (first magnetic ring 3, second magnetic ring 5, and third magnetic ring 15) that generates axial force are magnetized in the same axial direction. This arrangement produces the same negative stiffness as traditional electromagnetic springs. Furthermore, as... Figure 2As shown, in the traditional method, the axial stiffness continuously changes with the movement of the magnetic ring, while the compressor's frequency remains constant during actual operation. This results in a performance loss for the traditional variable stiffness magnetic ring, and when the stiffness variation is large, it cannot match the thermodynamic characteristics of the entire machine. In contrast, the linear compressor provided by this invention produces stiffness close to a straight line, meaning that the stiffness of the refrigeration unit remains consistent regardless of the position of the rotor, thus perfectly matching the thermodynamics of the entire machine.

[0032] In one embodiment, the mover assembly further includes a second permanent magnet 16; the second permanent magnet 16 is mounted on the mover frame 12, such as... Figure 1 As shown, the first permanent magnet 14 and the second permanent magnet 16 are respectively arranged on both sides of the third magnetic ring 15 along the axial direction, so that the force at both ends of the third magnetic ring 15 is uniform. The first permanent magnet 14 and the second permanent magnet 16 can be made of magnetic steel.

[0033] Furthermore, the second permanent magnet 16 is radially magnetized, and the first permanent magnet 14 and the second permanent magnet 16 preferably have the same size.

[0034] In an optimized embodiment, the cylinder 7 is fitted with an inner soft magnet 10 to optimize the magnetic circuit and improve motor efficiency; the first permanent magnet 14 and the third magnetic ring 15 are movably disposed between the inner wall of the stator frame 2 and the inner soft magnet 10.

[0035] To achieve efficient electromagnetic energy conversion, optimize the magnetic circuit, improve electromagnetic efficiency, and reduce energy loss, the stator assembly also includes an outer soft magnet 6; the outer soft magnet 6 wraps around the coil 4. Optionally, the first magnetic ring 3 and the second magnetic ring 5 are sleeved on the outer soft magnet 6.

[0036] In a more detailed embodiment, the linear compressor further includes a base 11; the cylinder 7 is disposed on the base 11. The base 11 may be integrally formed with the cylinder 7 to constitute a cylinder 7 seat.

[0037] Furthermore, the linear compressor also includes an end cover 1; one end of the stator frame 2 is connected to the end face of the base 11, and the other end is connected to the end cover 1; an internal chamber is formed between the stator frame 2, the base 11, and the end cover 1. The internal chamber is filled with refrigerant, and the rotor assembly and cylinder 7 are located within the internal chamber. Optionally, the end cover 1 and the end face of the stator frame 2 are fixed together by welding.

[0038] In one embodiment, the stator frame 2 is covered by an outer shell 17; one end of the outer shell 17 is fixedly connected to the base 11, and the other end is fixedly connected to the end cover 1. The coil 4, the first magnetic ring 3, the second magnetic ring 5, and the outer soft magnet 6 are all located inside the outer shell 17, forming a complete compressor through the enclosure of the outer shell 17 and the end cover 1.

[0039] Furthermore, the cylinder 7 is provided with a compression chamber 8; the piston 13 reciprocates within the compression chamber 8; the base 11 is provided with an airflow channel 9 connecting the compression chamber 8 to the outside. When the piston 13 reciprocates, expansion and compression occur within the compression chamber 8, driving gas to flow through the airflow channel 9 and thus driving the expander.

[0040] This invention also provides a linear Stirling refrigerator that uses a linear compressor as described above.

[0041] Example 1:

[0042] This embodiment provides a linear compressor, including a stator assembly, a cylinder 7 assembly, a mover assembly, an end cover 1, and a housing 17;

[0043] The stator assembly includes a stator frame 2, an outer soft magnet 6, a coil 4, a first magnetic ring 3, and a second magnetic ring 5. The coil 4 is sleeved on the outside of the stator frame 2, the outer soft magnet 6 is wrapped around the coil 4, the first magnetic ring 3 and the second magnetic ring 5 are sleeved on the outer soft magnet 6, and the first magnetic ring 3 and the second magnetic ring 5 are respectively arranged on both sides of the coil 4 along the axial direction.

[0044] The cylinder 7 assembly includes a base 11 and a cylinder 7 disposed on the base 11. The cylinder 7 and the base 11 are integrally formed. The cylinder 7 is located inside the stator frame 2, and the cylinder 7 is covered with an inner soft magnet 10. The cylinder 7 is provided with a compression chamber 8. The base 11 is provided with an airflow channel 9 that connects the compression chamber 8 with the outside.

[0045] The mover assembly includes a mover frame 12, a piston 13, a first permanent magnet 14, a second permanent magnet 16, and a third magnetic ring 15. One end of the piston 13 is movably inserted into the compression chamber 8 of the cylinder 7, and the other end is connected to the mover frame 12. The first permanent magnet 14, the third magnetic ring 15, and the second permanent magnet 16 are sequentially mounted on the mover frame 12 along the axial direction, and the first permanent magnet 14, the second permanent magnet 16, and the third magnetic ring 15 are movably disposed between the inner wall of the stator frame 2 and the inner soft magnet 10. In the initial state, the third magnetic ring 15 corresponds to the position of the coil 4, that is, in the radial direction, the third magnetic ring 15 is located between the inner wall of the stator frame 2 and the coil 4, and the first permanent magnet 14, the second permanent magnet 16, and the third magnetic ring 15 are located in the axial direction between the first magnetic ring 3 and the second magnetic ring 5.

[0046] The first magnetic ring 3, the second magnetic ring 5, and the third magnetic ring 15 are all axially magnetized and have the same magnetization direction. The first magnetic ring 3 and the second magnetic ring 5 have the same size. The first permanent magnet 14 and the second permanent magnet 16 are both radially magnetized, and the first permanent magnet 14 and the second permanent magnet 16 are magnets of the same size.

[0047] One end of the stator frame 2 is connected to the end face of the base 11, and the other end is connected to the end cover 1; an internal cavity is formed between the stator frame 2, the base 11, and the end cover 1; the internal cavity is filled with refrigerant, and the mover assembly and cylinder 7 are located in the internal cavity;

[0048] The outer casing 17 is fitted outside the stator frame 2; one end of the outer casing 17 is fixedly connected to the base 11, and the other end is fixedly connected to the end cover 1. The coil 4, the first magnetic ring 3, the second magnetic ring 5, and the outer soft magnet 6 are all located inside the outer casing 17.

[0049] When coil 4 is energized with alternating current, it generates a magnetic field. The first permanent magnet 14 and the second permanent magnet 16 are subjected to force, which drives the piston 13, the mover frame 12, and the third magnetic ring 15 to move together. When the mover assembly moves to one side, the first magnetic ring 3 and the second magnetic ring 5 interact with the third magnetic ring 15 respectively, generating axial forces in opposite directions, thus replacing the function of the leaf spring and achieving reciprocating motion. Through the above reciprocating motion, expansion and compression occur in the compression chamber 8 of the piston 13 and the cylinder 7, driving the gas to flow through the airflow channel 9 and thus driving the expander.

[0050] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. A linear compressor, characterized in that: The system includes a stator assembly, a cylinder (7), and a mover assembly. The stator assembly includes a stator frame (2) and coils (4), a first magnetic ring (3), and a second magnetic ring (5) respectively sleeved outside the stator frame (2). The first magnetic ring (3) and the second magnetic ring (5) are respectively arranged on both sides of the coil (4) along the axial direction. The cylinder (7) is located inside the stator frame (2). The mover assembly includes a mover frame (12), a piston (13), a first permanent magnet (14), and a third magnetic ring (15). One end of the piston (13) is movably inserted into the cylinder (7), and the other end is connected to the mover frame (12). The first permanent magnet (14) and the third magnetic ring (15) are both installed on the mover frame (12), and the first permanent magnet (14) and the third magnetic ring (15) are movably arranged between the inner wall of the stator frame (2) and the cylinder (7). The third magnetic ring (15) is arranged axially between the first magnetic ring (3) and the second magnetic ring (5).

2. The linear compressor as described in claim 1, characterized in that: The first magnetic ring (3), the second magnetic ring (5), and the third magnetic ring (15) are all axially magnetized and have the same magnetization direction; the first permanent magnet (14) is radially magnetized.

3. The linear compressor as described in claim 1, characterized in that: The mover assembly also includes a second permanent magnet (16); the second permanent magnet (16) is mounted on the mover frame (12), and the first permanent magnet (14) and the second permanent magnet (16) are respectively arranged on both sides of the third magnetic ring (15) along the axial direction.

4. The linear compressor as described in claim 3, characterized in that: The second permanent magnet (16) is radially magnetized.

5. The linear compressor as described in claim 1, characterized in that: In the initial state, the first magnetic ring (3) and the second magnetic ring (5) are symmetrically arranged on both sides of the axial direction of the third magnetic ring (15).

6. The linear compressor as described in claim 5, characterized in that: The first magnetic ring (3) and the second magnetic ring (5) have the same size.

7. The linear compressor as described in claim 1, characterized in that: In the initial state, the third magnetic ring (15) is located radially between the inner wall of the stator frame (2) and the coil (4).

8. The linear compressor as described in claim 1, characterized in that: The stator assembly also includes an outer soft magnet (6); the outer soft magnet (6) is wrapped around the coil (4).

9. The linear compressor as described in claim 8, characterized in that: The first magnetic ring (3) and the second magnetic ring (5) are both sleeved on the outer soft magnet (6).

10. A linear Stirling refrigerator, characterized in that: The linear compressor described in any one of claims 1-9 is employed.

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