Linear compressor

By designing the interlaced first and second radial support components in the linear compressor, the problems of high cost and complexity of the radial support of the mover are solved, and frictionless operation between the piston and the cylinder in an oil-free environment is achieved, reducing system complexity and cost.

CN222863577UActive Publication Date: 2025-05-13RUINA INTELLIGENT EQUIP CO LTD
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Patent Information

Application Number
CN202421247767.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-03
Publication Date
2025-05-13
Estimated Expiration
2034-06-03

AI Technical Summary

Technical Problem

The existing linear compressors have high cost and complexity in terms of radial support of the mover, especially in oil-free environments, which are difficult to achieve frictionless operation between the piston and the cylinder.

Method used

A linear compressor is designed, which adopts a first radial support assembly and a second radial support assembly to be arranged intertwined with each other, and is connected to the piston through the moving shaft through which the radial displacement limit of the moving shaft is achieved, thereby providing radial support to the motor rotor.

Benefits of technology

The frictionless operation between the piston and the cylinder is achieved in an oil-free environment, reducing the system complexity and cost, and ensuring the matching clearance between the piston and the cylinder.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a linear compressor which comprises a shell, an air cylinder, a motor stator and a motor rotor are arranged in the shell, a piston is arranged in the air cylinder in a sliding mode, and a first radial supporting assembly and a second radial supporting assembly are arranged in the motor stator at intervals. The first radial supporting assembly and the second radial supporting assembly are arranged in a staggered mode, a moving shaft is connected to the motor rotor and penetrates through the first radial supporting assembly and the second radial supporting assembly to be connected with the piston, and the first radial supporting assembly and the second radial supporting assembly enable the moving shaft to move in the axial direction of the moving shaft. And the piston slides back and forth in the air cylinder. According to the linear compressor, the radial displacement of the moving shaft is limited through the first radial supporting assembly and the second radial supporting assembly, so that the radial supporting effect on the motor rotor is achieved, the fit clearance between the piston and the air cylinder can be effectively guaranteed, friction between the piston and the air cylinder is avoided in the oil-free environment, installation is convenient, and cost is reduced.
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Description

Technical Field

[0001] The utility model belongs to the technical field of linear compressors, and in particular relates to a linear compressor. Background Art

[0002] At present, linear compressors have always faced the problem of radial support for the mover. Among them, conventional technology uses leaf springs to provide radial support for the mover, but the processing and material costs of leaf springs are too high, making them difficult to use in large quantities. In linear compressors using column springs, column springs cannot provide sufficient radial support. Generally, compression pistons are used to provide radial support, but they must be operated in an environment with lubricating oil. The oil system has oil circuits and oil pumps, which increases the complexity of the system. In addition, the lubricating oil will enter the circulation system with the compressed medium, causing the performance of the circulation system to deteriorate.

[0003] Therefore, it is urgent to design a linear compressor to solve the problem of radial support of the mover in the prior art mentioned above, which leads to increased costs. Utility Model Content

[0004] In order to solve the technical problem of increased cost caused by radial support of the mover in the prior art mentioned in the background technology, a linear compressor is provided to solve the above problem.

[0005] To achieve the above purpose, the specific technical solution of the linear compressor of the utility model is as follows:

[0006] A linear compressor includes a shell, a cylinder, a motor stator and a motor mover are arranged in the shell, a piston is slidably arranged in the cylinder, a first radial support assembly and a second radial support assembly are arranged in the motor stator at intervals, the first radial support assembly and the second radial support assembly are arranged alternately, a moving shaft is connected to the motor mover, the moving shaft passes through the first radial support assembly and the second radial support assembly and is connected to the piston, the first radial support assembly and the second radial support assembly enable the moving shaft to move along the axial direction of the moving shaft so that the piston slides back and forth in the cylinder.

[0007] Furthermore, the first radial support assembly and the second radial support assembly are arranged perpendicular to each other.

[0008] Furthermore, cylinders are arranged at both ends of the shell, a piston is slidably arranged in each cylinder, and both ends of the movable shaft are connected to a piston respectively.

[0009] Furthermore, the first radial support assembly includes a first mounting frame, on which a first axle and a second axle are spaced apart, a first support wheel is rotatably arranged on the first axle, a second support wheel is rotatably arranged on the second axle, and a movable shaft is slidably arranged between the first support wheel and the second support wheel.

[0010] Furthermore, the first support wheel and the second support wheel are both U-shaped groove wheels, and the movable shaft is slidably arranged in the clamping space formed by the U-shaped groove of the first support wheel and the U-shaped groove of the second support wheel.

[0011] Furthermore, the second radial support assembly includes a second mounting frame, on which a third axle and a fourth axle are spaced apart, a third support wheel is rotatably arranged on the third axle, a fourth support wheel is rotatably arranged on the fourth axle, and a movable shaft is slidably arranged between the third support wheel and the fourth support wheel.

[0012] Furthermore, the axes of the first support wheel and the second support wheel are arranged in parallel, the axes of the third support wheel and the fourth support wheel are arranged in parallel, the axes of the first support wheel and the third support wheel are perpendicular to each other, and the axes of the second support wheel and the fourth support wheel are perpendicular to each other.

[0013] Furthermore, the motor stator comprises an outer stator and an inner stator, the inner stator is sleeved in the outer stator, an annular gap is formed between the outer stator and the inner stator, and the motor mover is slidably arranged in the annular gap.

[0014] Furthermore, it also includes a connecting plate, one end of which is fixed to the first radial support assembly, and the other end of the connecting plate is connected to the motor stator.

[0015] Furthermore, it also includes a magnetic steel frame, one end of the magnetic steel frame is connected to the motor mover, and the other end of the magnetic steel frame is connected to the moving shaft.

[0016] The linear compressor of the utility model has the following advantages:

[0017] A cylinder, a motor stator and a motor mover are arranged in a shell, a piston is slidably arranged in the cylinder, a first radial support assembly and a second radial support assembly are arranged in the motor stator at intervals, the first radial support assembly and the second radial support assembly are arranged alternately, a movable shaft is connected to the motor mover, the movable shaft passes through the first radial support assembly and the second radial support assembly and is connected to the piston, the first radial support assembly and the second radial support assembly enable the movable shaft to move along the axial direction of the movable shaft, so that the piston can reciprocate in the cylinder, and the radial displacement of the movable shaft is limited by the first radial support assembly and the second radial support assembly, thereby playing a radial supporting role for the motor mover, which can effectively ensure the matching clearance between the piston and the cylinder, and realize friction-free piston and cylinder in an oil-free environment, and has a simple structure, convenient installation, and reduced cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the linear compressor of the utility model;

[0019] Figure 2 The cross-sectional structure of the linear compressor of the utility model is shown in FIG. Figure 1 ;

[0020] Figure 3 The cross-sectional structure of the linear compressor of the utility model is shown in FIG. Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the structure of the radial support structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the magnetic steel frame and the connecting plate of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the connecting plate of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the magnetic steel skeleton of the utility model.

[0025] Description of the markings in the figure:

[0026] 1. Shell; 11. Cylinder; 12. Motor stator; 121. Outer stator; 122. Inner stator; 13. Motor mover; 14. Coil; 2. First radial support assembly; 21. First mounting frame; 22. First wheel axle; 23. Second wheel axle; 24. First support wheel; 25. Second support wheel; 3. Second radial support assembly; 31. Second mounting frame; 32. Third wheel axle; 33. Fourth wheel axle; 34. Third support wheel; 35. Fourth support wheel; 4. Moving shaft; 5. Piston; 6. Connecting plate; 61. Through hole; 62. Plug-in portion; 7. Magnetic steel skeleton. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0028] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0029] Please refer to the attached Figure 1 To Attachment Figure 7 The linear compressor of the present invention is described.

[0030] like Figures 1 to 3 As shown, the linear compressor in the utility model comprises a housing 1, in which a cylinder 11, a motor stator 12 and a motor mover 13 are arranged, a piston 5 is slidably arranged in the cylinder 11, a first radial support assembly 2 and a second radial support assembly 3 are arranged in the motor stator 12 at intervals, the first radial support assembly 2 and the second radial support assembly 3 are arranged alternately, a moving shaft 4 is connected to the motor mover 13, the moving shaft 4 passes through the first radial support assembly 2 and the second radial support assembly 3 and is connected to the piston 5, and the first radial support assembly 2 and the second radial support assembly 3 make the moving shaft 4 move along the axial direction of the moving shaft 4, so that the piston 5 reciprocates in the cylinder 11. In this embodiment, the first radial support assembly 2 and the second radial support assembly 3 are arranged perpendicular to each other. In other embodiments, the first radial support assembly 2 and the second radial support assembly 3 can also be arranged at an angle of 45°, 90° or other angles to each other, as long as the moving shaft 4 can be moved along the axial direction of the moving shaft 4.

[0031] A cylinder 11, a motor stator 12 and a motor mover 13 are arranged in a shell 1, a piston 5 is slidably arranged in the cylinder 11, a first radial support assembly 2 and a second radial support assembly 3 are arranged in the motor stator 12 at intervals, the first radial support assembly 2 and the second radial support assembly 3 are arranged alternately, a movable shaft 4 is connected to the motor mover 13, the movable shaft 4 passes through the first radial support assembly 2 and the second radial support assembly 3 and is connected to the piston 5, the first radial support assembly 2 and the second radial support assembly 3 make the movable shaft 4 move along the axial direction of the movable shaft 4, so that the piston 5 reciprocates in the cylinder 11, and the radial displacement of the movable shaft 4 is limited by the first radial support assembly 2 and the second radial support assembly 3, so as to play a radial supporting role for the motor mover 13, which can effectively ensure the matching clearance between the piston 5 and the cylinder 11, and realize that the piston 5 and the cylinder 11 are frictionless in an oil-free environment, and the structure is simple, the installation is convenient, and the cost is reduced.

[0032] like Figures 2 to 4As shown, the first radial support assembly 2 includes a first mounting frame 21, on which a first wheel axle 22 and a second wheel axle 23 are arranged at intervals, a first support wheel 24 is rotatably arranged on the first wheel axle 22, a second support wheel 25 is rotatably arranged on the second wheel axle 23, and a moving shaft 4 is slidably arranged between the first support wheel 24 and the second support wheel 25. By arranging the first support wheel 24 and the second support wheel 25, the moving shaft 4 is between the first support wheel 24 and the second support wheel 25, and during the movement of the moving shaft 4 along its axial direction, the first support wheel 24 rotates on the first wheel axle 22, and the second support wheel 25 rotates on the second wheel axle 23. By arranging the moving shaft 4 between the first support wheel 24 and the second support wheel 25, on the one hand, arranging the first support wheel 24 and the second support wheel 25 facilitates the movement of the moving shaft 4, thereby reducing friction, and on the other hand, the first support wheel 24 and the second support wheel 25 can clamp the moving shaft 4 to ensure that the moving shaft 4 moves along its axial direction. In this embodiment, the first support wheel 24 and the second support wheel 25 are both U-shaped groove wheels, and the movable shaft 4 is slidably disposed in the clamping space formed by the U-shaped groove of the first support wheel 24 and the U-shaped groove of the second support wheel 25.

[0033] like Figures 2 to 4 As shown, the second radial support assembly 3 includes a second mounting frame 31, on which a third wheel shaft 32 and a fourth wheel shaft 33 are arranged at intervals, a third support wheel 34 is rotatably arranged on the third wheel shaft 32, a fourth support wheel 35 is rotatably arranged on the fourth wheel shaft 33, and the moving shaft 4 is slidably arranged between the third support wheel 34 and the fourth support wheel 35. By arranging the third support wheel 34 and the fourth support wheel 35, the moving shaft 4 is between the third support wheel 34 and the fourth support wheel 35, and during the movement of the moving shaft 4 along its axial direction, the third support wheel 34 rotates on the third wheel shaft 32, and the fourth support wheel 35 rotates on the fourth wheel shaft 33. By arranging the moving shaft 4 between the third support wheel 34 and the fourth support wheel 35, on the one hand, arranging the third support wheel 34 and the fourth support wheel 35 facilitates the movement of the moving shaft 4, reduces friction, and on the other hand, the third support wheel 34 and the fourth support wheel 35 can clamp the moving shaft 4 to ensure that the moving shaft 4 moves along its axial direction. In this embodiment, the third support wheel 34 and the fourth support wheel 35 are both U-groove wheels, and the movable shaft 4 is slidably disposed in the clamping space formed by the U-groove of the third support wheel 34 and the U-groove of the fourth support wheel 35.

[0034] like Figure 2 and Figure 3As shown, the first radial support assembly 2 and the second radial support assembly 3 are arranged perpendicular to each other. Specifically, the first mounting frame 21 and the second mounting frame 31 are arranged perpendicular to each other. The first mounting frame 21 and the second mounting frame 31 are both fixedly arranged in the motor stator 12. One end of the moving shaft 4 is slidably arranged between the first support wheel 24 and the second support wheel 25 of the first mounting frame 21, and the other end of the moving shaft 4 is slidably arranged between the third support wheel 34 and the fourth support wheel 35 of the second mounting frame 31. One end of the moving shaft 4 is supported by the first support wheel 24 and the second support wheel 25, and the other end of the moving shaft 4 is supported by the third support wheel 34 and the fourth support wheel 35, so as to ensure that the moving shaft 4 can always move along the axial direction of the moving shaft 4 during the moving process, so that the pistons 5 at both ends of the moving shaft 4 can reciprocate in the corresponding cylinders 11. In this embodiment, the axes of the first support wheel 24 and the second support wheel 25 are arranged in parallel, the axes of the third support wheel 34 and the fourth support wheel 35 are arranged in parallel, the axes of the first support wheel 24 and the third support wheel 34 are perpendicular to each other, and the axes of the second support wheel 25 and the fourth support wheel 35 are perpendicular to each other.

[0035] like Figure 2 and Figure 3 As shown, the motor stator 12 includes an outer stator 121 and an inner stator 122, the inner stator 122 is sleeved in the outer stator 121, an annular gap is formed between the outer stator 121 and the inner stator 122, and the motor mover 13 is slidably arranged in the annular gap. The outer stator 121 and the inner stator 122 are both annular structures, and a receiving groove is provided on the outer stator 121, and the coil 14 is arranged in the receiving groove of the outer stator 121. In this embodiment, the outer stator 121 and the cross section are C-shaped structures, and the coil 14 is wound in the outer stator 121 to form an annular coil 14. After the coil 14 is energized, the motor mover 13 performs linear motion along the axial direction of the annular inner stator 122, thereby driving the moving shaft 4 connected to the motor mover 13 to perform linear motion along its axial direction, thereby causing the piston 5 connected to the moving shaft 4 to perform reciprocating motion in the cylinder 11. In this embodiment, the motor mover 13 is a permanent magnet, and the outer stator 121 and the inner stator 122 are both yoke irons.

[0036] like Figure 5 and Figure 6 As shown, the linear compressor in the utility model further includes a connecting plate 6, two connecting plates 6 are provided, and the two connecting plates 6 are respectively provided on both sides of the motor stator 12, one end of one connecting plate 6 is fixed to the first radial support assembly 2, and the other end is connected to one side of the motor stator 12. One end of the other connecting plate 6 is fixed to the second radial support structure 3, and the other end is connected to the other side of the motor stator 12.

[0037] Specifically, the two connecting plates 6 are respectively arranged on the sides of the outer stator 121 and the inner stator 122. In order to ensure stable connection, the connecting plates 6 are circular connecting plates 6. The two connecting plates 6 are respectively connected to the sides of the outer stator 121 and the inner stator 122. The two connecting plates 6 have the same structure. The middle parts of the two connecting plates 6 are raised to form a plug-in portion 62. The plug-in portion 62 of one connecting plate 6 is plug-connected inside the inner stator 122 and connected to the first radial support assembly 2 inside the inner stator 122. The plug-in portion 62 of the other connecting plate 6 is plug-connected inside the inner stator 122 and connected to the second radial support assembly 3 inside the inner stator 122. That is, the plug-in portion 62 of one connecting plate 6 is fixedly connected to the first mounting frame 21, and the plug-in portion 62 of the other connecting plate 6 is fixedly connected to the second mounting frame 31, thereby realizing the fixed connection between the first radial support assembly 2 and the first radial support assembly 3.

[0038] like Figure 5 and Figure 7 As shown, the linear compressor in the utility model further includes a magnetic steel skeleton 7, one end of which is connected to the motor mover 13, and the other end of which is connected to the moving shaft 4. In order to connect the motor mover 13 to the magnetic steel skeleton 7, a through hole 61 is provided on the connecting plate 6, and the magnetic steel skeleton 7 is connected to the motor mover 13 through the through hole 61, and the middle part of the magnetic steel skeleton 7 is connected to the moving shaft 4, thereby connecting the motor mover 13, the moving shaft 4 and the piston 5. In this embodiment, there are also two magnetic steel skeletons 7, and the two magnetic steel skeletons 7 are respectively arranged on both sides of the motor mover 13, and the middle parts of the two magnetic steel skeletons 7 are respectively connected to the two ends of the moving shaft 4.

[0039] The working process of the linear compressor in the utility model is as follows:

[0040] The motor mover 13 is placed in the annular gap formed by the inner stator 122 and the outer stator 121. After the coil 14 is energized, the motor mover 13 drives the magnetic steel skeleton 7 to move, and then drives the moving shaft 4 connected to the magnetic steel skeleton 7 to move, and then drives the piston 5 connected to the two ends of the moving shaft 4 to move in the corresponding cylinder 11. The moving shaft 4 can only move along its axial direction under the limitation of the first radial support assembly 2 and the second radial support assembly 3. The piston 5 and the cylinder 11 are parallel to or coincide with the axis of the moving shaft 4, and the piston 5 is relatively fixed to the moving shaft 4, and the cylinder 11 is relatively fixed to the radial support structure 2, so that the piston 5 always keeps moving in the same direction as the cylinder 11, and there is no radial displacement of the piston 5, and there is no contact friction between the piston 5 and the cylinder 11, so that the piston 5 and the cylinder 11 do not need to be lubricated with lubricating oil, and the condition of oil-free operation is achieved.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A linear compressor, characterized in that: It includes a shell, in which a cylinder, a motor stator and a motor mover are arranged, a piston is slidably arranged in the cylinder, a first radial support assembly and a second radial support assembly are arranged in the motor stator at intervals, the first radial support assembly and the second radial support assembly are staggered with each other, a moving shaft is connected to the motor mover, the moving shaft passes through the first radial support assembly and the second radial support assembly and is connected to the piston, the first radial support assembly and the second radial support assembly enable the moving shaft to move along the axial direction of the moving shaft so that the piston slides back and forth in the cylinder.

2. The linear compressor according to claim 1, characterized in that: The first radial support assembly and the second radial support assembly are arranged perpendicular to each other.

3. The linear compressor according to claim 1, characterized in that: Cylinders are arranged at both ends of the shell, a piston is slidably arranged in each cylinder, and both ends of the moving shaft are connected with a piston respectively.

4. The linear compressor according to claim 1, characterized in that: The first radial support assembly includes a first mounting frame, on which a first axle and a second axle are spaced apart, a first support wheel is rotatably disposed on the first axle, a second support wheel is rotatably disposed on the second axle, and a movable shaft is slidably disposed between the first support wheel and the second support wheel.

5. The linear compressor according to claim 4, characterized in that: The first supporting wheel and the second supporting wheel are both U-shaped groove wheels, and the movable shaft is slidably arranged in a clamping space formed by the U-shaped groove of the first supporting wheel and the U-shaped groove of the second supporting wheel.

6. The linear compressor according to claim 4, characterized in that: The second radial support assembly includes a second mounting frame, on which a third axle and a fourth axle are spaced apart, a third support wheel is rotatably arranged on the third axle, a fourth support wheel is rotatably arranged on the fourth axle, and a movable shaft is slidably arranged between the third support wheel and the fourth support wheel.

7. The linear compressor according to claim 6, characterized in that: The axes of the first support wheel and the second support wheel are arranged in parallel, the axes of the third support wheel and the fourth support wheel are arranged in parallel, the axes of the first support wheel and the third support wheel are perpendicular to each other, and the axes of the second support wheel and the fourth support wheel are perpendicular to each other.

8. The linear compressor according to claim 1, characterized in that: The motor stator comprises an outer stator and an inner stator. The inner stator is sleeved in the outer stator. An annular gap is formed between the outer stator and the inner stator. The motor mover is slidably arranged in the annular gap.

9. The linear compressor according to claim 1, characterized in that: It also includes a connecting plate, one end of which is fixed to the first radial support assembly, and the other end of the connecting plate is connected to the motor stator.

10. The linear compressor according to claim 1, characterized in that It also includes a magnetic steel frame, one end of which is connected to the motor mover, and the other end of which is connected to the moving shaft.