Opposed linear compressor supported by double end plate springs

Abstract

The utility model discloses an opposed linear compressor supported by double end plate springs, which comprises a main frame part, two stator parts, a rotor part and a compressor shell, the number of the stator parts is two, and the two stator parts are symmetrically arranged on two sides of the main frame part and are used for reducing the vibration of the compressor; and the mover part and the stator part are respectively connected through fastening screws. The utility model solves the problems of insufficient non-contact clearance sealing reliability and shorter service life of the existing high-power single-side plate spring supported free piston type linear compressor, overlong length and overlarge volume of an opposed linear compressor and the like, and is particularly suitable for high-power high-cooling-capacity refrigerators.

Description

Technical Field

[0001] This utility model relates to the field of linear compressor technology in refrigeration and cryogenic engineering, specifically to an opposed linear compressor supported by double-end plate springs. Background Technology

[0002] Free-reciprocating linear compressors are widely used in infrared detection, aerospace, cryogenic medicine, and national defense due to their advantages such as high power density, high efficiency, high cleanliness, and high reliability. However, lifespan remains a major bottleneck limiting their use (for example, spaceborne cryogenic compressors require an MTBF of tens of thousands of hours or more). Friction and wear caused by moving parts in the compressor, as well as working fluid contamination and gas path blockage caused by abrasive debris, are important factors affecting their lifespan and performance. Therefore, non-contact gap sealing, that is, strictly ensuring the gap sealing requirements between the piston and cylinder to avoid mutual contact and friction, is an important guarantee for the long lifespan of free-reciprocating linear compressors.

[0003] Free-piston linear compressors use leaf springs to support the piston, providing axial stiffness to maintain the piston's reciprocating motion and radial stiffness to maintain the sealing clearance between the piston and cylinder. Most existing compressors use a single-sided leaf spring support structure. However, a single-sided leaf spring support is similar to a single cantilever structure. In addition to the radial force, the weight of the mover and the unbalanced force caused by uneven magnetic fields also exert a torque on the fixed point between the mover and the leaf spring. When the mover mass is large or the radial force generated by other factors is large, the supporting effect of the leaf spring assembly on the other free end of the mover is greatly weakened. When it is insufficient to balance the radial force, the free end will produce a large radial offset, contacting the cylinder wall and generating friction, thus affecting the performance and lifespan of the refrigeration unit. Utility Model Content

[0004] The purpose of this utility model is to provide a double-end leaf spring support structure, that is, leaf springs are used to support both ends of the mover, which further increases the radial support stiffness of the leaf spring assembly, makes up for the deficiency of single-sided support, and improves the reliability of non-contact gap sealing; at the same time, the compression chamber is set between the two leaf spring assemblies, which reduces the axial dimension of the compressor; the double-end leaf springs adopt a design with different diameters, making the compressor more compact as a whole; and the opposing type reduces the vibration of the compressor.

[0005] The technical solution of this utility model is as follows:

[0006] A opposed linear compressor supported by double-end leaf springs, the linear compressor adopting an opposed design, including a main frame component 100, two stator components 200, a mover component 300, an inflation end cover 403, a sealing plug 406, a sealing end cover 404, and a compressor housing 405. Two stator components 200 are symmetrically mounted on both sides of the main frame component 100 with pins at one end. O-rings 501 are provided on their inner sides, and they are sealed by laser welding on their outer sides. The inflation end cap 403 and sealing end cap 404 are respectively mounted on the other ends of the two stator components 200 and sealed by laser welding. The sealing plug 406 is installed inside the inflation hole of the inflation end cap 403. The compressor housing 405 is connected to the compressor by laser welding. The screw holes at both ends of the mover component 300 are aligned with the screw holes at both ends of the stator component 200 and connected by the left leaf spring component fastening screw 402 and the right leaf spring component fastening screw 401, respectively. Adjustment ensures that the coaxiality of the compression piston 303 and the cylinder reaches its optimal level.

[0007] Further, the main frame component 100 includes a main frame A101 and an air outlet 102, which are sealed together by vacuum brazing; the stator component 200 includes a cylinder coil frame component, an inner soft magnet 203, a left outer soft magnet 204, a right outer soft magnet 205, a coil 206, and an upper outer soft magnet 207. The cylinder coil frame component includes a main frame B201 and a coil frame 202, which are sealed together by laser welding. The annularly wound coil 206 is surrounded between the left outer soft magnet 204, the right outer soft magnet 205, and the upper outer soft magnet 207, and an excitation magnetic field is formed by passing alternating current through it; the mover component 300 mainly includes a left plate spring component, a right plate spring component, a permanent magnet component, and a compression piston. 303, the left leaf spring component includes a left leaf spring 304, a left leaf spring inner spacer 306, and a left leaf spring outer spacer 305, with the left leaf spring inner spacer 306 and left leaf spring outer spacer 305 sandwiched between two left leaf springs 304. The right leaf spring component includes a right leaf spring 307, a right leaf spring inner spacer 309, and a right leaf spring outer spacer 308, with the right leaf spring inner spacer 309 and right leaf spring outer spacer 308 sandwiched between two right leaf springs 307. All components are connected by laser welding. The permanent magnet component includes a moving magnet frame 301 and a magnet tile 302, which are connected by adhesive. The two ends of the compression piston 303 are connected to the permanent magnet component and the right leaf spring component by screws, respectively.

[0008] Furthermore, the main frame A101 has a through hole that communicates with the air outlet of the stator component 200 along the axial direction, and an air outlet that is connected to the air outlet nozzle 102. It also has a groove for installing a two-core connector and a hole for filling thermal grease on the radially outer side. It has pin positioning holes on both sides along the axial direction to ensure that the air outlet of the stator component is aligned with the air outlet of the main frame A.

[0009] Furthermore, the main frame B201 has radially opened air outlets that communicate with the compression chamber, and axially opened through holes that connect the inner and outer back pressure chambers, so as to avoid pressure imbalance in the inner back pressure chamber caused by gas leakage, temperature rise, etc., which could lead to vibration and other problems.

[0010] Furthermore, the compression piston 303 is stepped and installed between the two leaf spring components, forming an annular compression chamber with the cylinder. Both ends are positioned to ensure optimal coaxiality between the outer surface of the compression piston 303 and the inner surface of the cylinder. It should be noted that the surface of the compression piston 303 can be coated or uncoated. After fine grinding, the single-sided gap between it and the cylinder can be maintained between 5μm and 25μm to ensure a good gap sealing effect.

[0011] Furthermore, the left outer soft magnet 204, right outer soft magnet 205, and upper outer soft magnet 207 are all provided with grooves of different lengths along the axial direction to cut off the eddy current path and reduce eddy current loss; the inner soft magnet is provided with grooves of different lengths along the axial direction, but a certain distance is left from both ends of the axial direction to prevent the magnetic field attraction from being too strong and causing deformation, thereby causing contact and friction with the inner wall of the moving magnet frame 301; the inner soft magnet 203 has an O-ring anti-collision ring mounting groove at one end near the moving magnet frame component to ensure that the maximum stroke of the mover is less than or equal to the design value. In this embodiment, the outer soft magnet surrounds the coil in a C-shape.

[0012] Preferably, the profiles of the left leaf spring 304 and the right leaf spring 307, while meeting the stiffness requirements, adopt concentric Archimedean spirals. At the beginning and end positions of the profiles, the transition between adjacent profiles is handled by rounding corners to reduce local stress concentration in the leaf springs. When the left and right leaf spring components at both ends of the moving part are installed, the leaf spring profiles are ensured to rotate in opposite directions to reduce possible torsion during movement.

[0013] The assembly method of the opposed linear compressor supported by double-end leaf springs includes the following steps:

[0014] Prepare suitable solder, make it into a single ring-shaped solder slightly larger than the diameter of the air outlet 102, and place it at the weld seam between the main frame A101 and the air outlet. Use vacuum brazing to seal the connection. After welding, clean and check the airtightness.

[0015] 1. The inner hole of the main frame B201 is precision ground to ensure that the coaxiality is no greater than 0.005mm and the surface roughness is no greater than 0.2μm. With the assistance of the tooling, the inner soft magnet 203 is installed and connected to the main frame B by laser welding, and the anti-collision ring 502 is placed in the O-ring groove. With the assistance of the positioning tooling, the main frame B201 and the coil frame 202 are sealed and connected by laser welding. The weld is checked to ensure good sealing and that the coaxiality between the inner wall of the coil frame 202 and the inner wall of the cylinder is no greater than 0.01mm. Glue is applied to the inner surfaces of the left outer soft magnet 204 and the right outer soft magnet 205 and installed in the motor slot. After the glue dries, the coil 206 is wound with a winding machine with the assistance of the tooling. During the winding process, attention should be paid to applying epoxy resin glue to play an insulating and heat-conducting role. Pay attention to whether it is conductive with the metal shell. After winding according to the design requirements, the resistance is measured and recorded. Glue is applied to the inner sides of both ends of the upper outer soft magnet and installed on the outside of the motor slot to surround the coil and form a magnetic circuit.

[0016] The annular magnetizing material is cut into several pieces and magnetized radially in a parallel magnetizing manner until the design requirements are met. With the aid of the tooling, after applying glue to the inside of the magnetic tile 302, it is installed on the outside of the moving magnetic frame 301. Pay attention to the flatness of the magnetic tile. After forming the annular permanent magnet component, clean and dry it. The baking temperature should not exceed 120℃. When using the tooling, ensure that the moving magnetic frame 301 does not deform.

[0017] With the aid of the tooling, the two left leaf springs 304, the outer spacer 305, and the inner spacer 306 are laser-welded into a left leaf spring component as required, and the two right leaf springs 307, the outer spacer 308, and the inner spacer 309 are laser-welded into a right leaf spring component.

[0018] 1. The surface of the stepped compression piston 303 shall be finely ground as required to ensure that the coaxiality is not greater than 0.005mm and the surface roughness is not greater than 0.2μm. If a wear-resistant layer needs to be sprayed, fine grinding shall be performed after spraying. With the assistance of the positioning fixture, one end of the compression piston is connected to the permanent magnet component by the glue screw 310 to ensure that the coaxiality between the inner wall of the moving magnet frame 301 and the surface of the compression piston 303 is not greater than 0.01mm. The left leaf spring component is connected to the permanent magnet component by the glue screw 311 to ensure that the perpendicularity between the surface of the leaf spring and the surface of the compression piston 303 is not greater than 0.01mm.

[0019] Insert the moving part without the right leaf spring into the assembled stator part from one end, and apply AC power to adjust it to minimize the working current and achieve optimal coaxiality between the surface of the compression piston 303 and the inner wall of the cylinder. Fix the outer ring of the left leaf spring with the glued left leaf spring part fastening screw 402, install the right leaf spring part fastening washer 313, connect the compression piston 303 to the right leaf spring part with the glued screw 312, and fix the outer ring of the right leaf spring with the glued right leaf spring part fastening screw 401.

[0020] Insert positioning pins at both ends of the main frame component 100, in step... O-rings 501 are installed on the stator component 200 and mover component 300 assembly and screwed into the main frame component 100, ensuring that the air holes are aligned and the sealing ring is not damaged. Laser welding is used to seal the connection and the weld is checked to ensure good sealing performance. The same operation is performed to complete the installation on the other end. After assembling the compressor component with the compressor sealing test fixture, the test and run-in are carried out, and the experimental data is recorded and the pass rate is checked.

[0021] After connecting the coil wiring to the two-core connector, fix it to the corresponding slot in the main frame component 100; install the sealing ring 503 in the O-shaped grooves of the inflation end cover 403 and the sealing end cover 404, and use laser welding to seal the inflation end cover 403 and the sealing end cover 404 to the compressor, checking the weld to ensure good sealing; use laser welding to connect the compressor housing 405 to the compressor; after welding the connecting pipe, configure a pneumatic expander or pulse tube refrigerator, install the sealing plug 406, and after filling the refrigerator with a certain pressure of working fluid, check the airtightness to ensure that the leakage rate of the working fluid is not greater than .

[0022] This utility model has the following features:

[0023] (1) Leaf springs are used to support both ends of the mover, which further increases the radial support stiffness of the leaf spring assembly, makes up for the deficiency of single-sided support, and improves the reliability of non-contact gap sealing.

[0024] (2) The compression chamber is located between the two leaf spring groups, which reduces the axial dimension of the compressor. The double-end leaf springs are designed with different diameters, making the compressor more compact. The opposing type reduces the vibration of the compressor.

[0025] (3) The main frame is provided with a through hole that is connected to the air outlet of the stator component along the axial direction, and an air outlet that is connected to the air outlet nozzle. A groove for installing a two-core connector and a hole for filling thermal grease are also provided on the radial outer side. Pin positioning holes are provided on both sides of the axial direction to ensure that the air outlet of the stator component is aligned with the air outlet of the main frame A.

[0026] (4) The main frame is radially provided with an air outlet that communicates with the compression chamber, and axially provided with evenly distributed through holes that connect the inner and outer back pressure chambers, so as to avoid pressure imbalance in the inner back pressure chamber due to gas leakage, temperature rise, etc., which may cause vibration and other problems.

[0027] (5) The compression piston is stepped and installed between two leaf spring components, forming an annular compression chamber with the cylinder. Both ends are positioned to ensure that the coaxiality between the outer surface of the compression piston and the inner surface of the cylinder reaches the best. It should be noted that the surface of the compression piston can be sprayed or not sprayed. After fine grinding, the single-sided gap between the piston and the cylinder can be maintained between 5μm and 25μm.

[0028] (6) The left outer soft magnet, right outer soft magnet, and upper outer soft magnet are all provided with grooves of different lengths along the axial direction to cut off the eddy current path and reduce eddy current loss; the inner soft magnet is provided with grooves of different lengths along the axial direction, but a certain distance is left from both ends of the axial direction to prevent the magnetic field attraction from being too strong and causing deformation, and friction with the inner wall of the moving magnet frame; the end of the inner soft magnet near the moving magnet frame component is provided with an O-ring anti-collision ring mounting groove to ensure that the maximum stroke of the mover is less than or equal to the design value. It should be noted that the way the outer soft magnet surrounds the coil includes, but is not limited to, C-shaped, Redlich type, etc.

[0029] (7) The profiles of the left and right leaf springs, while meeting the stiffness requirements, include, but are not limited to, concentric or eccentric Archimedean spirals, involutes, etc., and the transition between adjacent profiles is handled by rounding at the beginning and end of the profiles to reduce local stress concentration of the leaf springs; when the left and right leaf spring components at both ends of the moving part are installed, the leaf spring profiles should be rotated in opposite directions to reduce the possible torsion during the movement;

[0030] (8) A detailed assembly method for a opposed linear compressor supported by double-end plate springs is provided.

[0031] The advantages of this utility model, in light of existing technology, are:

[0032] This invention addresses the shortcomings and technical problems of single-sided leaf spring support structures in non-contact gap sealing of free-piston linear compressors, providing a double-end leaf spring supported opposed-type linear compressor, particularly suitable for high-power, high-capacity refrigeration units. The double-end leaf spring support structure further increases the radial support stiffness of the leaf spring assembly, compensating for the deficiencies of single-sided support and improving the reliability of non-contact gap sealing. Through compact design, the axial length and volume of the compressor are reduced, and the opposed-type configuration reduces compressor vibration. Attached Figure Description

[0033] Figure 1 This is an exploded view of the components of the double-end plate spring-supported compressor of this utility model;

[0034] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the double-end plate spring supported compressor of this utility model;

[0035] Figure 3 This is a schematic cross-sectional view of the main frame component in this utility model;

[0036] Figure 4 This is a schematic cross-sectional view of the cylinder coil frame component in this utility model;

[0037] Figure 5 This is a schematic cross-sectional view of the moving part in this utility model;

[0038] Figure 6 This is a schematic diagram of the internal soft magnetic component structure in this utility model;

[0039] In the picture:

[0040] 100 - Main frame component, 200 - Stator component, 300 - Mover component;

[0041] 101-Main unit frame A, 102-Air outlet,

[0042] 201-Main frame B, 202-Coil frame, 203-Inner soft magnet, 204-Left outer soft magnet, 205-Right outer soft magnet, 206-Coil, 207-Upper outer soft magnet.

[0043] 301-Moving magnetic frame, 302-Magnetic tile, 303-Compression piston, 304-Left leaf spring, 305-Left leaf spring outer spacer, 306-Left leaf spring inner spacer, 307-Right leaf spring, 308-Right leaf spring outer spacer, 309-Right leaf spring inner spacer;

[0044] 401-Right leaf spring assembly fastening screw, 402-Left leaf spring assembly fastening screw, 403-Inflation end cap, 404-Sealing end cap, 405-Compressor housing, 406-Sealing plug;

[0045] 501 - O-ring seal, 502 - anti-collision ring, 503 - sealing ring. Detailed Implementation

[0046] To make the purpose, content, and advantages of this utility model clearer, the specific structure and working principle of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] like Figure 1 and Figure 2As shown, a opposed linear compressor supported by double-end leaf springs is disclosed. The linear compressor adopts an opposed design to reduce compressor vibration. It includes a main frame component 100, two stator components 200, a mover component 300, an inlet end cover 403, a sealing plug 406, a sealing end cover 404, and a compressor housing 405. Two stator components 200 are symmetrically mounted on both sides of the main frame component 100 with pins at one end. O-rings 501 are provided on their inner sides, and they are sealed by laser welding on their outer sides. The inflation end cap 403 and sealing end cap 404 are respectively mounted on the other ends of the two stator components 200 and sealed by laser welding. The sealing plug 406 is installed inside the inflation hole of the inflation end cap 403. The compressor housing 405 is connected to the compressor by laser welding. The screw holes at both ends of the mover component 300 are aligned with the screw holes at both ends of the stator component 200 and connected by the left leaf spring component fastening screw 402 and the right leaf spring component fastening screw 401, respectively. Adjustment ensures that the coaxiality of the compression piston 303 and the cylinder reaches its optimal level.

[0048] like Figure 2 As shown, the main frame component 100 includes a main frame A101 and an air outlet 102, which are sealed together by vacuum brazing; the stator component 200 mainly includes a cylinder coil frame component, an inner soft magnet 203, a left outer soft magnet 204, a right outer soft magnet 205, a coil 206, and an upper outer soft magnet 207. The cylinder coil frame component includes a main frame B201 and a coil frame 202, which are sealed together by laser welding. The annularly wound coil 206 is surrounded between the left outer soft magnet 204, the right outer soft magnet 205, and the upper outer soft magnet 207, and an excitation magnetic field is formed by passing alternating current through it; the mover component 300 mainly includes a left leaf spring component, a right leaf spring component, a permanent magnet component, and a compression piston. 303, the left leaf spring component includes a left leaf spring 304, a left leaf spring inner spacer 306, and a left leaf spring outer spacer 305, with the left leaf spring inner spacer 306 and left leaf spring outer spacer 305 sandwiched between two left leaf springs 304. The right leaf spring component includes a right leaf spring 307, a right leaf spring inner spacer 309, and a right leaf spring outer spacer 308, with the right leaf spring inner spacer 309 and right leaf spring outer spacer 308 sandwiched between two right leaf springs 307. All components are connected by laser welding. The permanent magnet component includes a moving magnet frame 301 and a magnet tile 302, which are connected by adhesive. The two ends of the compression piston 303 are connected to the permanent magnet component and the right leaf spring component by screws, respectively.

[0049] like Figure 3As shown, the main frame A101 has a through hole that communicates with the air outlet of the stator component 200 along the axial direction, and an air outlet that is connected to the air outlet nozzle 102. It also has a groove for installing a two-core connector and a hole for filling thermal grease on the radially outer side. It has pin positioning holes on both sides along the axial direction to ensure that the air outlet of the stator component is aligned with the air outlet of the main frame A.

[0050] like Figure 4 As shown, the main frame B201 has a radially open air outlet that communicates with the compression chamber, and an axially open through hole that connects the inner and outer back pressure chambers, so as to avoid pressure imbalance in the inner back pressure chamber caused by gas leakage, temperature rise, etc., which could lead to vibration and other problems.

[0051] like Figure 5 As shown, the compression piston 303 is stepped and installed between two leaf spring components, forming an annular compression chamber with the cylinder. Both ends are positioned to ensure optimal coaxiality between the outer surface of the compression piston 303 and the inner surface of the cylinder. It should be noted that the surface of the compression piston 303 can be coated or uncoated. After fine grinding, the single-sided gap between it and the cylinder can be maintained between 5μm and 25μm to ensure a good gap sealing effect.

[0052] The left outer soft magnet 204, right outer soft magnet 205, and upper outer soft magnet 207 are all provided with grooves of different lengths along the axial direction to cut off the eddy current path and reduce eddy current loss; for example Figure 6 As shown, the inner soft magnet has grooves of different lengths cut along the axial direction, but a certain distance is left from both ends of the axial direction to prevent excessive magnetic attraction from causing deformation and thus contact and friction with the inner wall of the moving magnet frame 301; the inner soft magnet 203 has an O-ring anti-collision ring mounting groove at one end near the moving magnet frame component to ensure that the maximum stroke of the mover is less than or equal to the design value. In this embodiment, the outer soft magnet surrounds the coil in a C-shape.

[0053] In this embodiment, the left leaf spring 304 and the right leaf spring 307 adopt concentric Archimedean spirals to meet the stiffness requirements. At the beginning and end positions of the profiles, the transition between the two adjacent profiles is handled by rounding the corners to reduce the local stress concentration of the leaf springs. When the left and right leaf spring components at both ends of the moving part are installed, the leaf spring profiles are ensured to rotate in opposite directions to reduce the torsion that may occur during the movement.

Claims

1. A double-sided spring supported opposed linear compressor comprising a main frame part (100), a stator part (200), a mover part (300) and a compressor housing (405), characterized in that, The stator component (200) is two, two stator component (200) symmetry installation in the two sides of the main frame component (100), for reducing the vibration of the compressor; the screw hole of the mover component (300) is aligned with the screw hole of the stator component (200), and is connected with each other by fastening screw.

2. The dual-end plate spring supported opposed linear compressor of claim 1, wherein: It also includes the inflation end cover (403), sealing plug (406), sealing end cover (404) and compressor shell (405), the inner side of the stator component (200) is provided with O type sealing ring (501), its outer side is connected by welding sealing; The inflation end cover (403) and the sealing end cover (404) are installed at the other end of the two stator components (200) respectively, and are connected by welding sealing; The sealing plug (406) is installed in the inflation hole of the inflation end cover (403); The compressor shell (405) is connected with the compressor by laser welding; The screw holes of the left and right ends of the mover component (300) are aligned with the screw holes of the left and right ends of the stator component (200), and are connected by the left plate spring component fastening screw (402) and the right plate spring component fastening screw (401) respectively, and the coaxiality of the compression piston (303) and the cylinder is ensured by debugging.

3. The dual-end plate spring supported opposed linear compressor of claim 2, wherein: The main frame component (100) includes main frame A (101) and gas outlet nozzle (102), which are sealingly connected by vacuum brazing; The stator component (200) includes cylinder coil support component, inner soft magnetic (203), left outer soft magnetic (204), right outer soft magnetic (205), coil (206) and upper outer soft magnetic (207), the cylinder coil support component includes main frame B (201) and coil support (202), which are sealingly connected by laser welding, the annularly wound coil (206) is surrounded between the left outer soft magnetic (204), the right outer soft magnetic (205) and the upper outer soft magnetic (207), and the alternating current is passed to form excitation magnetic field; The mover component (300) mainly includes left plate spring component, right plate spring component, permanent magnet component and compression piston (303), the left plate spring component includes left plate spring (304), left plate spring inner spacer (306) and left plate spring outer spacer (305), the left plate spring inner spacer (306) and the left plate spring outer spacer (305) are clamped between the two left plate springs (304), the right plate spring component includes right plate spring (307), right plate spring inner spacer (309) and right plate spring outer spacer (308), the right plate spring inner spacer (309) and the right plate spring outer spacer (308) are clamped between the two right plate springs (307), which are connected by laser welding, the permanent magnet component includes dynamic magnetic frame (301) and magnetic tile (302), which are connected by adhesive, and the compression piston (303) is connected with the permanent magnet component and the right plate spring component by screws at both ends.

4. The dual-end plate spring supported opposed linear compressor of claim 3, wherein, The main frame A (101) is provided with a through hole communicated with the gas outlet hole of the stator component (200) in the axial direction, a gas outlet hole connected with the gas outlet nozzle (102), a slot for installing a two-core connector and a hole for pouring and sealing a heat-conducting grease, and a pin positioning hole provided on both sides of the axial direction to ensure the alignment of the stator component and the gas outlet hole of the main frame A.

5. The dual-end plate spring supported opposed linear compressor of claim 3, wherein, The main frame B (201) is provided with a gas outlet hole communicated with the compression cavity in the radial direction, and a through hole communicated with the inner and outer back pressure cavities in the axial direction to avoid the pressure imbalance of the inner back pressure cavity due to gas leakage, temperature rise and the like, thereby avoiding the vibration problem.

6. The dual-end plate spring supported opposed linear compressor of claim 3, wherein, The compression piston (303) is in a stepped shape and is installed in the middle of the two plate spring components to form an annular compression cavity with the cylinder, and the coaxiality of the outer surface of the compression piston (303) and the inner surface of the cylinder is ensured to be optimal through the positioning faces at both ends.

7. The dual-end plate spring supported opposed linear compressor of claim 6, wherein, The surface of the compression piston (303) is sprayed or not sprayed, and the single-sided gap between the compression piston (303) and the cylinder after fine grinding can be maintained between 5 μm and 25 μm to ensure the gap sealing effect.

8. The dual-end plate spring supported opposed linear compressor of claim 3, wherein, The left outer soft magnet (204), the right outer soft magnet (205) and the upper outer soft magnet (207) are all provided with different length slits in the axial direction to cut off the eddy current path and reduce the eddy current loss.

9. The dual-end plate spring supported opposed linear compressor of claim 7, wherein, The slits of the inner soft magnet (203) are away from both ends of the axial direction to prevent the deformation caused by the excessive magnetic attraction force, thereby preventing the friction caused by the contact with the inner wall of the moving magnet frame (301); the end of the inner soft magnet (203) close to the moving magnet frame component is provided with an O-shaped anti-collision ring installation slot to ensure that the maximum stroke of the moving element is less than or equal to the design value; and the outer soft magnet surrounds the coil in a C-shaped manner.

10. The double-end plate spring supported opposed linear compressor of any of claims 1-9, wherein, The left plate spring (304) and the right plate spring (307) adopt a concentric Archimedes spiral line, and the connection transition between the adjacent two lines at the starting and ending positions of the line is treated in a rounded corner manner to reduce the local stress concentration of the plate spring. The left plate spring component and the right plate spring component at both ends of the moving element component are installed to ensure that the plate spring line directions are opposite to each other to weaken the possible twisting during the movement.

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