Miniature lightweight linear compressor and refrigerating machine thereof

Abstract

The application discloses a micro lightweight linear compressor and a refrigerating machine thereof, which comprises a cylinder seat, the cylinder seat comprising a cylinder shell and a cylinder body arranged on the cylinder shell, an integrated end cover, a stator assembly, the stator assembly being arranged between the cylinder shell and the integrated end cover, an inner portion of the stator assembly being provided with a rotor assembly, the rotor assembly comprising a magnetic steel framework and a piston outwardly protruding from one side of the magnetic steel framework, the piston being slidingly arranged in the inner portion of the cylinder body, a plurality of magnetic steels being arranged on the magnetic steel framework, the magnetic steel framework and the piston being integrally arranged, a sealing cover plate being fixedly connected with a mounting shaft body, and the mounting shaft body being connected with an inner magnetic yoke. The application utilizes the cooperation of the cylinder seat, the integrated end cover, the stator assembly, the rotor assembly and the leaf spring, so that the piston compression area can be flexibly designed under the condition that the external volume is unchanged, the required stroke of the piston can be flexibly adjusted, and thus the size adjustability of the compressor is improved under the same swept volume.

Description

Technical Field

[0001] This invention relates to the field of compressors, and particularly to a miniature lightweight linear compressor and its refrigeration unit. Background Technology

[0002] Infrared detectors are core components of infrared detection, infrared night vision, and infrared guidance devices. Split-type cryogenic refrigerators provide a low-temperature environment for the detector chip, reducing noise and improving image quality. They are a core component of infrared detectors. Linear Stirling refrigerators consist of a linear compressor, an expander, and connecting pipes. Currently, the structure of linear compressors is relatively fixed, typically composed of high-precision machined parts such as cylinder blocks, stator frames, and magnet frames with similar structures.

[0003] However, due to the fixed structure of existing assembly methods, the size of the compressor is also determined when the scavenging volume of the compressor is fixed, making it difficult to further reduce the size. This has become a bottleneck problem for the miniaturization of refrigeration machines. At the same time, linear compressors have extremely high requirements for the dimensional accuracy of each part, especially the inner wall surface of the cylinder seat that needs to be fitted with the piston clearance. The tolerance requirement is usually within 10μm. However, the inner wall of the cylinder seat has a small diameter and a long hole, which makes it difficult to process and increases the cost accordingly. Summary of the Invention

[0004] The purpose of this invention is to provide a miniature lightweight linear compressor and its refrigeration unit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a miniature lightweight linear compressor, comprising:

[0006] Cylinder housing, the cylinder housing including a cylinder shell and a cylinder body disposed on the cylinder shell;

[0007] Integrated end cap;

[0008] The stator assembly and the mover assembly are disposed between the cylinder housing and the integrated end cap. The mover assembly is disposed inside the stator assembly (3). The mover assembly includes a magnet frame and a piston that protrudes outward from the side of the magnet frame near the cylinder seat. The piston is slidably disposed inside the cylinder body. The magnet frame is provided with magnets.

[0009] Preferably, the magnetic steel frame and the piston are integrated into one unit.

[0010] Preferably, the integrated end cap includes a sealing cover plate, a mounting shaft, and an inner magnetic yoke, wherein the sealing cover plate is fixedly connected to the mounting shaft, and the mounting shaft is connected to the inner magnetic yoke.

[0011] Preferably, the magnetic steel frame has an installation cavity, the installation shaft is slidably sleeved in the installation cavity, and the inner magnetic yoke is sleeved on the outside of the installation shaft.

[0012] Preferably, the inner wall of the magnet frame is provided with an installation groove, and the magnet is installed in the installation groove.

[0013] Preferably, the stator assembly includes a stator frame, a coil is sleeved on the outside of the stator frame, an outer magnetic yoke is sleeved on the outside of the coil, and an annular groove corresponding to the coil is formed on the outside of the stator frame.

[0014] Preferably, the outer magnetic yoke includes multiple arc blocks, and adjacent arc blocks are interlocked with each other.

[0015] Preferably, leaf springs are fixedly sleeved on both sides of the magnetic steel frame, and the outer ring of the leaf springs is fixedly engaged with the stator assembly by a positioning rod.

[0016] Preferably, it also includes a plurality of internal bolts, which pass through the integrated end cap, stator assembly and cylinder housing in sequence to fix the three together.

[0017] Another object of the present invention is to provide a refrigeration machine comprising the above-described miniature lightweight linear compressor.

[0018] The technical effects and advantages of this invention are as follows:

[0019] (1) The compressor piston of the present invention protrudes outward from the side of the magnet frame near the cylinder seat. Both the piston and the cylinder are located outside the magnet frame and do not need to pass through the middle of the stator assembly and the magnet frame, thereby reducing the length of the cylinder and the piston. The length and diameter of the cylinder and the piston can be flexibly adjusted. This structure allows for flexible design of the piston compression area without changing the external volume, and also allows for flexible adjustment of the piston stroke. Thus, under the same scavenging volume, the adjustability of the compressor size is improved. Furthermore, the reduction in the length of the cylinder and the piston reduces the processing difficulty.

[0020] (2) The present invention fixes the inner soft magnet on the end cover, and its size is not limited by the size of the piston and cylinder. Without increasing the axial length, the radial size of the linear motor is reduced, thereby realizing the miniaturization and lightweighting of the compressor.

[0021] (3) The present invention utilizes the setting method of the moving part assembly to integrate the magnet frame, piston and magnet into one piece in the structure, eliminating the intermediate assembly link. Its form and position tolerance can be guaranteed in the machining section, which can simplify the alignment and debugging process between the piston and cylinder and improve the assembly efficiency of the compressor. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the internal structure of the front of the present invention.

[0024] Figure 3 This is a schematic diagram of the overall structure of the sealing cover plate of the present invention.

[0025] Figure 4 This is a schematic diagram of the internal structure of the magnet frame of the present invention.

[0026] Figure 5 This is a schematic diagram of the internal structure of the stator frame of the present invention.

[0027] Figure 6 For the present invention Figure 2 Enlarged structural diagram at point A in the middle.

[0028] Figure 7 This is a schematic diagram of the overall structure of the arc block of the present invention.

[0029] In the diagram: 1. Cylinder seat; 11. Cylinder housing; 12. Cylinder body; 13. Exhaust port; 14. Cylinder chamber; 2. Integrated end cap; 21. Sealing cover plate; 22. Mounting shaft; 23. Inner magnetic yoke; 24. Movable chamber; 3. Stator assembly; 31. Stator frame; 32. Outer magnetic yoke; 321. Arc block; 322. Arc groove; 323. Locking block; 324. Locking slot; 33. Coil; 34. Annular groove; 35. Connecting chamber; 36. Air storage chamber; 41. Magnet frame; 42. Piston; 43. Magnet; 44. Mounting chamber; 5. Leaf spring; 51. Positioning rod; 6. Inner bolt. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides, for example Figure 1-7 The miniature lightweight linear compressor shown includes:

[0032] The cylinder base 1 includes a cylinder housing 11 and a cylinder body 12 mounted on the cylinder housing 11. The cylinder body 12 protrudes outward from both sides of the middle portion of the cylinder housing 11. An exhaust port 13 is provided on the cylinder housing 11. Cylinder chambers 14 are provided on both sides of the cylinder housing 11. The space inside the cylinder body 12 forms a compression chamber. The bore depth of the cylinder body 12 is shortened, retaining only the clearance fit length with the piston 42, reducing the difficulty of machining.

[0033] Two integrated end caps 2, each including a sealing cover plate 21, with a mounting shaft 22 fixedly connected to one side of the sealing cover plate 21. The mounting shaft 22 and the sealing cover plate 21 can be integrally set. An inner magnetic yoke 23 is provided at one end of the outer wall of the mounting shaft 22.

[0034] The stator assembly 3 and the mover assembly are provided. The stator assembly 3 is disposed between the cylinder housing 11 and the sealing cover plate 21. The mover assembly is disposed inside the stator assembly 3. The mover assembly includes a magnet frame 41 and a piston 42. The piston 42 protrudes outward from the side of the magnet frame 41 near the cylinder seat 1 and is slidably disposed inside the cylinder body 12. The magnet frame 41 and the piston 42 are preferably integrated, eliminating the intermediate assembly process (when the piston 42 and the magnet frame 41 are fixed by screws or welding in the traditional way, additional tooling is required). Their dimensional and positional tolerances can be guaranteed in the machining stage, which simplifies the machining process. The alignment and adjustment process between piston 42 and cylinder 12 improves the compressor assembly efficiency. One or more magnets 43 are set inside the magnet frame 41. When a sinusoidal voltage is provided to the coil 33, the electromagnetic force excites the magnets 43 to drive the magnet frame 41 and piston 42 to perform periodic reciprocating motion in the axial direction. This causes the piston 42 to repeatedly compress the gas in the compression chamber inside the cylinder 12. This structure allows for flexible design of the piston 42 compression area without changing the external volume, and also allows for flexible adjustment of the required stroke of the piston 42. Thus, under the same scavenging volume, the adjustability of the compressor size is improved.

[0035] Specifically, the stator assembly 3 includes a stator frame 31, a coil 33 is sleeved on the outside of the stator frame 31, an outer magnetic yoke 32 is sleeved on the outside of the coil 33, the outer magnetic yoke 32 is slidably engaged with the inside of the stator frame 31, air storage chambers 36 are opened at both ends of the stator frame 31, a connecting chamber 35 matching the magnet frame 41 is opened inside the stator frame 31, an annular groove 34 is opened on the outside of the stator frame 31, and the coil 33 is sleeved inside the annular groove 34.

[0036] Furthermore, the outer magnetic yoke 32 includes multiple arc blocks 321 arranged in a ring array. The arc blocks 321 have arc grooves 322 that match the coil 33 inside. A locking block 323 is symmetrically fixedly connected to one side of the arc block 321, and a locking slot 324 that matches the locking block 323 is symmetrically opened on the other side of the arc block 321. Two adjacent arc blocks 321 are slidably engaged with the locking block 323 and the locking slot 324.

[0037] Furthermore, the magnetic steel frame 41 has an installation chamber 44 inside, and the inner wall of the installation chamber 44 has multiple installation grooves. Multiple magnets 43 are fixedly sleeved in the inner cavity of the installation grooves. The outer wall of the installation shaft 22 is slidably sleeved with the inner cavity of the installation chamber 44. A leaf spring 5 is fixedly sleeved on the magnetic steel frame 41.

[0038] Furthermore, leaf springs 5 ​​are fixedly sleeved on both sides of the magnetic steel frame 41, and the center of gravity of the mover assembly is located between the two leaf springs 5, which can further improve the stability of the radial support and improve the reliability of the compressor. The two corresponding leaf springs 5 ​​are located at both ends of the stator frame 31, and both ends of the stator frame 31 are provided with connecting grooves that match the leaf springs 5. Multiple positioning rods 51 that lock the leaf springs 5 ​​are fixedly connected in a ring array on one side of the sealing cover plate 21 and both sides of the cylinder housing 11. The positioning rods 51 can improve the stability of the leaf springs 5 ​​during installation and use. The outer wall of the leaf spring 5 is located in the inner cavity of the connecting groove, and the outer wall of the positioning rod 51 slides through and sleeves with the leaf spring 5. Multiple positioning grooves are provided on one side of the inner wall of the connecting groove, and the outer wall of the positioning rod 51 slides and engages with the positioning groove.

[0039] Furthermore, an annular groove is provided at one end of the outer wall of the mounting shaft 22, and multiple limiting grooves are provided on the inner wall of the annular groove. Multiple binding blocks are fixedly connected to the inner wall of the inner magnetic yoke 23. The outer wall of the binding block is slidably engaged with the inner cavity of the limiting groove. Adhesive is applied to both the inside of the inner magnetic yoke 23 and the outside of the binding blocks to improve the stability of the inner magnetic yoke 23 installation. A movable chamber 24 is provided on one side of the sealing cover plate 21. The inner magnetic yoke 23 is fixed on the sealing cover plate 21. Its size is not limited by the size of the piston 42 and the cylinder housing 11. The radial dimension of the linear motor is reduced without increasing the axial length, thereby achieving miniaturization and lightweighting of the compressor.

[0040] Specifically, it also includes multiple inner bolts 6, which pass through the integrated end cover 2, stator assembly 3 and cylinder housing 11 in sequence to fix and assemble the three. The inner bolts 6 can fix the integrated end cover 2, stator assembly 3 and cylinder housing 1. By removing the inner bolts 6, it can be disassembled and maintained.

[0041] This embodiment provides a refrigeration unit, which includes the aforementioned miniature lightweight linear compressor.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A miniature lightweight linear compressor, characterized in that, include: Cylinder seat (1), the cylinder seat (1) includes cylinder housing (11) and cylinder body (12) disposed on cylinder housing (11); An integrated end cap (2) includes a mounting shaft (22) and an inner magnetic yoke (23), wherein the mounting shaft (22) is connected to the inner magnetic yoke (23). The stator assembly (3) and the mover assembly are provided. The stator assembly (3) is located between the cylinder housing (11) and the integrated end cap (2). The mover assembly is located inside the stator assembly (3). The mover assembly includes a magnet frame (41) and a piston (42) that protrudes outward from the side of the magnet frame near the cylinder seat (1). The piston (42) is slidably located inside the cylinder body (12). The magnet frame (41) is provided with magnets (43). The piston (42) and the cylinder body (12) are both located outside the magnet frame (41) and do not need to pass through the middle of the stator assembly (3) and the magnet frame (41). The magnet frame (41) has an installation chamber (44). The installation shaft (22) is slidably sleeved in the installation chamber (44). The inner magnetic yoke (23) is sleeved outside the installation shaft (22).

2. The miniature lightweight linear compressor according to claim 1, characterized in that, The magnetic steel frame (41) and piston (42) are integrated.

3. A miniature lightweight linear compressor according to claim 1, characterized in that, The integrated end cap (2) also includes a sealing cover plate (21), which is fixedly connected to the mounting shaft (22).

4. A miniature lightweight linear compressor according to claim 1, characterized in that, The inner wall of the magnetic steel frame (41) is provided with an installation groove, and the magnet (43) is installed in the installation groove.

5. A miniature lightweight linear compressor according to claim 1, characterized in that, The stator assembly (3) includes a stator frame (31), a coil (33) is sleeved on the outside of the stator frame (31), an outer magnetic yoke (32) is sleeved on the outside of the coil (33), and an annular groove (34) corresponding to the coil (33) is opened on the outside of the stator frame (31).

6. A miniature lightweight linear compressor according to claim 5, characterized in that, The outer magnetic yoke (32) includes multiple arc blocks (321), and adjacent arc blocks (321) are interlocked with each other.

7. A miniature lightweight linear compressor according to claim 4, characterized in that, Both sides of the magnetic steel frame (41) are fixedly sleeved with leaf springs (5), and the outer ring of the leaf springs (5) is fixedly engaged with the stator assembly (3) by positioning rods (51).

8. A miniature lightweight linear compressor according to claim 1, characterized in that, It also includes multiple inner bolts (6), which pass through the integrated end cap (2), stator assembly (3) and cylinder housing (11) in sequence to fix the three together.

9. A refrigeration machine, characterized in that, The refrigeration unit includes a miniature lightweight linear compressor as described in any one of claims 1-8.

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