Oil-free compressor

Abstract

The oil-free compressor comprises a compressor cylinder body, a compression mechanism, a driving mechanism, an eccentric wheel mechanism and a balance mechanism, the compressor cylinder body is provided with a compression cavity, the compression mechanism is slidably connected into the compression cavity, the driving mechanism comprises a driving shaft, the driving shaft is rotatably connected to the compressor cylinder body, and the eccentric wheel mechanism is connected to the driving shaft; the balance mechanism is connected to the driving shaft, and the gravity center of the balance mechanism and the gravity center of the eccentric wheel mechanism are symmetrically arranged relative to the driving shaft, so that it is guaranteed that dynamic balance is achieved in the rotating process of the rotating shaft; and therefore, the rotating shaft is prevented from driving the oilless compressor to shake in the rotating process.

Description

Technical Field

[0001] The present application belongs to the technical field of compressors, and more specifically, relates to an oil-free compressor. Background Art

[0002] In medical treatment, firefighting, high-altitude marches and combat, oxygen cylinders are required for oxygen supply. At present, the oxygen storage pressure of oxygen cylinders is mostly 15MPa. Without changing the equipment, increasing the oxygen storage pressure of oxygen cylinders can store more oxygen, extend the oxygen supply time, and make life support more reliable, which is of great significance. Usually, an oxygen compressor is used to pressurize the oxygen cylinder.

[0003] At present, in gas compressors, such as reciprocating piston compressors, a crank-connecting rod mechanism is usually used to drive the piston to perform reciprocating motion to achieve gas compression. However, since the crank-connecting rod mechanism has a complex structure and is difficult to manufacture, and since a bearing is required to connect the crank and the piston of the crank-connecting rod mechanism, the bearing requires grease lubrication, and it is difficult to achieve the purpose of oil-free operation. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an oil-free compressor to solve the technical problem in the prior art that the compressor must be oil-free when compressing oxygen.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide an oil-free compressor including a compressor cylinder, a compression mechanism, a driving mechanism, and an eccentric wheel mechanism, wherein the compressor cylinder is provided with a compression chamber, the compression mechanism is slidably connected in the compression chamber, a driving shaft is rotatably connected to the compressor cylinder, the eccentric wheel mechanism is connected to the driving shaft and is rotatably connected to the compression mechanism, and the eccentric wheel mechanism is used to drive the compression mechanism to slide in the compression chamber, wherein:

[0006] A sealing component is provided between the compression mechanism and the compression chamber;

[0007] The compression mechanism is provided with a limit block, and the limit block is used to limit the movement of the first bearing in the eccentric wheel mechanism along the axial direction of the drive shaft;

[0008] A guide bearing is provided in the compression chamber, and the compression mechanism is slidably connected in the guide bearing;

[0009] A balancing mechanism is provided on the driving shaft, and the center of gravity of the balancing mechanism and the center of gravity of the eccentric wheel mechanism are symmetrically arranged with respect to the driving shaft.

[0010] Optionally, the sealing assembly comprises:

[0011] A Variseal seal ring is disposed between the compression mechanism and the compression chamber.

[0012] Optionally, the sealing assembly further comprises:

[0013] A back pressure ring abutting against the Variseal sealing ring;

[0014] A first gasket and a first wear-resistant ring are both arranged on a side of the Variseal sealing ring away from the back pressure ring, and the first gasket is located between the first wear-resistant ring and the Variseal sealing ring;

[0015] The second gasket and the second wear-resistant ring are both arranged on the side of the back pressure ring away from the Variseal sealing ring, and are spaced apart from the back pressure ring along the axial direction of the compression mechanism, and the second gasket is located between the back pressure ring and the second wear-resistant ring.

[0016] Optionally, a slot is provided on the limit block, and the eccentric wheel mechanism includes a first bearing, and an outer ring of the first bearing is clamped in the slot.

[0017] Optionally, the compression mechanism comprises a push rod, and the push rod is slidably connected in the guide bearing;

[0018] The push rod is provided with a first guide surface, and the guide bearing is provided with a second guide surface for matching with the first guide surface.

[0019] Optionally, the balancing mechanism comprises:

[0020] A counterweight block is connected to the driving shaft.

[0021] Optionally, the compressor cylinder body is symmetrically arranged about the drive shaft.

[0022] The oil-free compressor provided by the present application has the following beneficial effects: compared with the prior art, the oil-free compressor of the present application comprises a compressor cylinder, a compression mechanism, a sealing mechanism, an eccentric wheel mechanism, and a balancing mechanism, wherein the compressor cylinder is provided with a compression chamber, the compression mechanism is slidably connected in the compression chamber, and a sealing mechanism is provided between the compression mechanism and the compression chamber, the sealing mechanism comprises a universal seal ring, the eccentric wheel mechanism and the compression mechanism are separately arranged, the compression mechanism is used to compress the air in the compression chamber, and by arranging the sealing mechanism between the compression mechanism and the compression chamber and by arranging the eccentric wheel mechanism and the compression mechanism separately, the grease of the driving mechanism is prevented from entering or contaminating the compression chamber, thereby achieving oil-free compression of gas;

[0023] At the same time, by arranging a guide bearing in the compression chamber, the guide bearing is made of self-lubricating metal material or non-metallic material, so that no lubricating grease is required between the eccentric mechanism and the guide bearing, further ensuring that the lubricating grease will not enter or contaminate the compression chamber, ensuring oil-free compression of the gas;

[0024] A drive shaft is provided on the compressor cylinder body, and an eccentric wheel mechanism is connected to the drive shaft and is rotatably connected to the compression mechanism. The eccentric wheel mechanism is used to drive the compression mechanism to slide in the compression chamber. The balancing mechanism is connected to the drive shaft, and the center of gravity of the balancing mechanism and the center of gravity of the eccentric wheel mechanism are symmetrically arranged about the drive shaft, thereby ensuring that the rotating shaft achieves dynamic balance during rotation, thereby preventing the rotating shaft from causing the compressor to vibrate during rotation, so as to ensure the stability and reliability of the gas compression operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A schematic diagram of the structure of an oil-free compressor provided in an embodiment of the present application;

[0027] Figure 2 Schematic diagram of the internal structure of the oil-free compressor provided in the embodiment of the present application Figure 1 ;

[0028] Figure 3 Schematic diagram of the internal structure of the oil-free compressor provided in the embodiment of the present application Figure 2 ;

[0029] Figure 4 Schematic diagram of the internal structure of the oil-free compressor provided in the embodiment of the present application Figure 3 ;

[0030] Figure 5 for Figure 2 A magnified view of the structure of the middle A section;

[0031] Figure 6 for Figure 3 A magnified view of the structure of the middle B section;

[0032] Figure 7 A schematic structural diagram of an oil-free compressor provided in another embodiment of the present application.

[0033] Among them, the reference numerals in the figure are:

[0034] 10. Compressor cylinder block; 11. Compression chamber; 111. Limiting groove; 12. Cylinder head; 121. Air inlet; 122. Exhaust port; 13. Air inlet pipe; 14. Air inlet valve; 15. Exhaust pipe; 16. Exhaust valve; 17. Cylinder liner; 171. First limiting ring; 172. Second limiting ring; 18. Bushing; 19. Guide bearing;

[0035] 20. Compression mechanism; 21. Pull ring; 211. Accommodation chamber; 22. Piston; 23. Push rod; 24. Limit block; 241. Retaining edge; 242. Slot;

[0036] 30. driving mechanism; 31. driving shaft; 32. second bearing; 33. driving motor; 34. driving pulley; 35. driven pulley; 36. driving belt;

[0037] 40. eccentric wheel mechanism; 41. eccentric wheel; 42. first bearing; 43. retaining ring;

[0038] 50. balancing mechanism; 51. first counterweight; 52. second counterweight;

[0039] 60. Sealing mechanism; 61. Panseal seal; 62. Back pressure ring; 63. First gasket; 64. First wear-resistant ring; 65. Second gasket; 66. Second wear-resistant ring. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] Please also read Figures 1 to 6, the oil-free compressor provided in the embodiment of the present application is now described.

[0045] An oil-free compressor comprises a compressor cylinder 10, a compression mechanism 20, a driving mechanism 30, an eccentric wheel mechanism 40, and a balancing mechanism 50.

[0046] Specifically, a compression chamber 11 and a cylinder head 12 are provided on the compressor cylinder body 10 , and the compression mechanism 20 is slidably connected in the compression chamber 11 .

[0047] The compression chamber 11 penetrates the compressor cylinder body 10 along the length direction of the compressor cylinder body 10. The cylinder head 12 is connected to the compressor cylinder body 10 by bolts to seal the compression chamber 11. The cylinder head 12 is provided with an air inlet 121 and an air outlet 122, and the air inlet 121 and the air outlet 122 are both connected to the compression chamber 11. The air inlet 121 is connected to an air inlet pipe 13, and an air inlet valve 14 is provided between the air inlet pipe 13 and the air inlet 121. The other end of the air inlet pipe 13 is connected to an air source for providing an air source, such as oxygen, into the compression chamber 11. The exhaust port 122 is connected to an exhaust pipe 15, and an exhaust valve 16 is provided between the exhaust pipe 15 and the exhaust port 122. The other end of the exhaust pipe 15 is connected to an oxygen compression tank.

[0048] When the compression mechanism 20 compresses the oxygen in the compression chamber 11, the intake valve 14 closes the intake port 121, and the exhaust valve 16 is opened after the oxygen in the compression chamber 11 is compressed, so that the exhaust valve 16 opens the exhaust port 122, and then the oxygen enters the oxygen compression tank through the exhaust pipe 15. Under the action of the oxygen pressure in the gas source, the intake valve 14 opens the intake port 121, and the oxygen pushes the compression mechanism 20 back to the initial position to facilitate the next compression of oxygen. At this time, the exhaust valve 16 closes the exhaust port 122.

[0049] The driving mechanism 30 includes a driving shaft 31, and the driving shaft 31 is rotatably connected to the compressor cylinder 10 through a second bearing 32. The eccentric wheel mechanism 40 is connected to the driving shaft 31 and is rotatably connected to the compression mechanism 20, and is used to drive the compression mechanism 20 to slide in the compression chamber 11. The balancing mechanism 50 is connected to the driving shaft 31, and the center of gravity of the balancing mechanism 50 and the center of gravity of the eccentric wheel mechanism 40 are symmetrically arranged about the driving shaft 31.

[0050] Compared with the prior art, the oil-free compressor of the present application includes a compressor cylinder 10, a compression mechanism 20, a sealing mechanism 60, a driving mechanism 30, an eccentric wheel mechanism 40, and a balancing mechanism 50, wherein the compressor cylinder 10 is provided with a compression chamber 11, the compression mechanism 20 is slidably connected in the compression chamber 11, and a sealing mechanism 60 is provided between the compression mechanism 20 and the compression chamber 11, and the sealing mechanism 60 includes a universal seal 61, the eccentric wheel mechanism 40 and the compression mechanism 20 are separately arranged, and the compression mechanism 20 is driven by the driving mechanism 30 to compress air in the compression chamber 11, and the sealing mechanism 60 is provided between the compression mechanism 20 and the compression chamber 11 and the eccentric wheel mechanism 40 and the compression mechanism 20 are separately arranged to prevent the grease of the driving mechanism 30 from entering or contaminating the compression chamber 11, thereby achieving oil-free compression of oxygen.

[0051] At the same time, by arranging a guide bearing 19 in the compression chamber 11, the guide bearing 19 adopts a self-lubricating metal material or a self-lubricating non-metallic material, so that no lubricating grease is required between the eccentric mechanism and the guide bearing 19, further ensuring that the lubricating grease will not enter or contaminate the compression chamber 11, thereby ensuring oil-free compression of oxygen.

[0052] The driving mechanism 30 includes a driving shaft 31, which is rotatably connected to the compressor cylinder body 10. The eccentric wheel mechanism 40 is connected to the driving shaft 31 and is rotatably connected to the compression mechanism 20, and is used to drive the compression mechanism 20 to slide in the compression chamber 11. The balancing mechanism 50 is connected to the driving shaft 31, and the center of gravity of the balancing mechanism 50 and the center of gravity of the eccentric wheel mechanism 40 are symmetrically arranged about the driving shaft 31, thereby ensuring that the rotating shaft achieves dynamic balance during the rotation process, thereby preventing the rotating shaft from causing the compressor to vibrate during the rotation process, so as to ensure the stability and reliability of the oxygen compression operation.

[0053] In one embodiment of the application, the balancing mechanism 50 includes a first counterweight 51 and a second counterweight 52 .

[0054] The first counterweight 51 and the second counterweight 52 are both fixedly connected to the drive shaft 31 by bolts, and the first counterweight 51 and the second counterweight 52 are spaced apart along the axial direction of the drive shaft 31, and the centers of gravity of the first counterweight 51 and the second counterweight 52 are both located on the same side of the drive shaft 31, and the line between the centers of gravity of the first counterweight 51 and the centers of gravity of the second counterweight 52 is parallel to the axial direction of the drive shaft 31. The eccentric wheel mechanism 40 is located between the first counterweight 51 and the second counterweight 52.

[0055] Since the center of gravity of the balancing mechanism 50 and the center of gravity of the eccentric wheel mechanism 40 are symmetrically arranged about the drive shaft 31, the drive shaft 31 can achieve dynamic balance when rotating, thereby preventing the drive shaft 31 from causing the oil-free compressor to vibrate when rotating.

[0056] Preferably, in the present application, the first counterweight block 51 and the second counterweight block 52 are both fan-shaped structures.

[0057] In one embodiment of the present application, the eccentric mechanism 40 includes an eccentric 41 and a first bearing 42 .

[0058] The eccentric wheel 41 is eccentrically connected to the driving shaft 31 . The inner ring of the first bearing 42 is sleeved on the eccentric wheel 41 , and the outer ring of the first bearing 42 is installed in the compression mechanism 20 .

[0059] Specifically, the compression mechanism 20 includes a pull ring 21 , a piston 22 and a push rod 23 .

[0060] The pull ring 21 is provided with a receiving chamber 211, and the first bearing 42 is installed in the receiving chamber 211, and the two ends of the first bearing 42 along the extension direction of the compression chamber 11 are respectively abutted against the two side walls of the receiving chamber 211 along the extension direction of the compression chamber 11. The piston 22 is slidably connected in the compression chamber 11. The push rod 23 is connected to the pull ring 21 by bolts and is located on the outside of the pull ring 21, and is used to abut against the piston 22 to drive the piston 22 to compress gas, such as compressed oxygen.

[0061] When the drive shaft 31 rotates, it rotates in the accommodating chamber 211 through the eccentric wheel 41. The eccentric wheel 41 drives the first bearing 42 to drive the pull ring 21 to drive the push rod 23 to slide in the compression chamber 11 along the extension direction of the compression chamber 11. When the compression chamber 11 compresses oxygen, the push rod 23 abuts against the piston 22 and drives the piston 22 to slide in the compression chamber 11 to compress oxygen. After the compression of oxygen is completed, the push rod 23 is driven away from the piston 22 by the drive shaft 31 and the eccentric wheel 41. At this time, under the action of the air source pressure, oxygen enters the compression chamber 11 from the air inlet 121 and pushes the piston 22 rod back to the initial position to facilitate the next oxygen compression.

[0062] In one embodiment of the present application, the compression mechanism 20 further includes a limit block 24 , wherein the limit block 24 and the push rod 23 are respectively connected to the inner and outer sides of the pull ring 21 through the same bolt.

[0063] Specifically, the limit block 24 is installed in the accommodating cavity 211 and is disposed on the side wall where the first bearing 42 abuts against the pull ring 21. The limit block 24 is provided with a slot 242, and the outer wall of the first bearing 42 is engaged in the slot 242.

[0064] The limit block 24 is provided with two ribs 241, which extend radially along the first bearing 42, and are spaced apart along the axial direction of the first bearing 42 to form a slot 242. The outer ring of the first bearing 42 is clamped in the slot 242, and the two axial ends of the outer ring of the first bearing 42 are respectively abutted against the two ribs 241 to prevent the first bearing 42 from falling off the limit block 24.

[0065] In one embodiment of the present application, a retaining ring 43 is provided on the eccentric wheel 41 to further fix the first bearing 42 on the eccentric wheel 41 .

[0066] In one embodiment of the present application, a cylinder liner 17 is provided in the compression chamber 11, a bushing 18 is provided in the cylinder liner 17, the length of the bushing 18 is smaller than the length of the cylinder liner 17, a portion of the piston 22 is slidably connected in the cylinder liner 17, and another portion is slidably connected in the bushing 18.

[0067] Specifically, a limiting groove 111 is provided in the compression chamber 11, and a first limiting ring 171 is convexly provided on the outer wall of the cylinder sleeve 17 on the side close to the cylinder head 12. The first limiting ring 171 is clamped in the limiting groove 111, and the side of the cylinder sleeve 17 close to the cylinder head 12 abuts against the cylinder head 12. A second limiting ring 172 is convexly provided on the inner wall of the cylinder sleeve 17. The length of the bushing 18 is less than the length between the end of the cylinder sleeve 17 close to the cylinder head 12 and the second limiting ring 172, and the end of the bushing 18 close to the cylinder head 12 abuts against the cylinder head 12.

[0068] Part of the piston 22 is slidably connected to the cylinder sleeve 17, and the other part is slidably connected to the bushing 18. The outer wall of the piston 22 abuts and slidably fits with the bushing 18 and the inner wall of the second stop ring 172. By arranging the cylinder sleeve 17 and the bushing 18 in the compression chamber 11, during processing, it is only necessary to ensure the matching accuracy between the piston 22 and the bushing 18.

[0069] A sealing mechanism 60 is provided between the piston 22 and the cylinder sleeve 17. The sealing mechanism 60 can be provided on the cylinder sleeve 17, and of course, the sealing mechanism 60 can also be provided on the piston 22.

[0070] The following description will be made by taking the sealing mechanism 60 disposed on the cylinder sleeve 17 as an example.

[0071] Specifically, the bushing 18 is spaced apart from the second stop ring 172 at one end away from the cylinder head 12, and the sealing mechanism 60 is disposed between the bushing 18 and the second stop ring 172. The sealing mechanism 60 includes a Variseal seal ring 61 and a back pressure ring 62, wherein the Variseal seal ring 61 is located between the bushing 18 and the back pressure ring 62.

[0072] A first gasket 63 and a first wear-resistant ring 64 are further provided between the bushing 18 and the second limiting ring 172. The first gasket 63 is located between the first wear-resistant ring 64 and the Variseal seal 61, and the first wear-resistant ring 64 is located between the first gasket 63 and the bushing 18. A second gasket 65 and a second wear-resistant ring 66 are provided in sequence on the other side of the second limiting ring 172.

[0073] In another embodiment of the present application, the sealing mechanism 60 is disposed on the piston 22 .

[0074] Specifically, the sealing mechanism 60 is sleeved on the piston 22, and the sealing mechanism 60 includes a Variseal seal ring 61 and a back pressure ring 62, wherein the Variseal seal ring 61 is located between the bushing 18 and the back pressure ring 62. The piston 22 is also provided with a first gasket 63 and a first wear-resistant ring 64, the first gasket 63 and the first wear-resistant ring 64 are located between the bushing 18 and the second stop ring 172, the first gasket 63 is located between the first wear-resistant ring 64 and the Variseal seal ring 61, and the first wear-resistant ring 64 is located between the first gasket 63 and the bushing 18. A second gasket 65 and a second wear-resistant ring 66 are sequentially provided on the other side of the piston 22 located on the second stop ring 172.

[0075] In one embodiment of the present application, a guide bearing 19 is further provided in the compression chamber 11, and the ejector rod 23 is slidably connected in the guide bearing 19. It should be noted that the guide bearing 19 is made of self-lubricating material, for example, the guide bearing 19 is made of polytetrafluoroethylene composite material.

[0076] Specifically, in the present application, the guide bearing 19 is fixed to the end of the compression chamber 11 away from the cylinder head 12 by bolts, and the push rod 23 is partially slidably connected in the guide bearing 19. A first guide surface is provided on the outer wall of the push rod 23, and the first guide surface is arranged parallel to the axial direction of the push rod 23. A second guide surface for cooperating with the first guide surface is provided in the guide bearing 19, and the second guide plane is arranged parallel to the axial direction of the guide bearing. The first guide surface and the second guide surface are slidably matched to prevent the pull ring 21 from tilting when driving the push rod 23 to slide relative to the guide bearing 19.

[0077] In one embodiment of the present application, the compressor cylinder 10 is symmetrically arranged about the drive shaft 31 .

[0078] Specifically, in the present application, the number of compressor cylinders 10 is two, the two compressor cylinders 10 are symmetrically arranged about the drive shaft 31, and the two compressor cylinders 10 are fixedly connected by bolts.

[0079] By providing two compressor cylinders 10, it is convenient to process the two compressor cylinders 10 separately. At the same time, by providing two compressor cylinders 10, it is also convenient to install the cam mechanism and the compression mechanism 20.

[0080] In another embodiment of the present application, the driving mechanism 30 also includes a driving motor 33, a driving belt 36 wheel 34, a driven pulley 35 and a driving belt 36. The driving motor 33 and the oil-free compressor are connected to the same base. The driving belt 36 wheel 34 is connected to the rotating shaft of the driving motor 33, and the driven pulley 35 is connected to the driving shaft 31. The driving belt 36 wheel 34 drives the driven pulley 35 through the driving belt 36 to drive the driving shaft 31 to rotate, so that the oil-free compressor compresses oxygen.

[0081] See also Figure 7 In another embodiment of the present application, along the axial direction of the driving shaft 31, a plurality of the oil-free compressors are sequentially connected in series on the driving shaft 31.

[0082] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An oil-free compressor, comprising a compressor cylinder, a compression mechanism, a driving mechanism, and an eccentric wheel mechanism, wherein the compressor cylinder is provided with a compression chamber, the compression mechanism is slidably connected in the compression chamber, the compressor cylinder is rotatably connected with a driving shaft, the eccentric wheel mechanism is connected to the driving shaft and is rotatably connected to the compression mechanism, the eccentric wheel mechanism is used to drive the compression mechanism to slide in the compression chamber, and is characterized in that: A sealing component is provided between the compression mechanism and the compression chamber; The compression mechanism is provided with a limit block, and the limit block is used to limit the movement of the first bearing in the eccentric wheel mechanism along the axial direction of the drive shaft; A guide bearing is provided in the compression chamber, and the compression mechanism is slidably connected in the guide bearing; A balancing mechanism is provided on the driving shaft, and the center of gravity of the balancing mechanism and the center of gravity of the eccentric wheel mechanism are symmetrically arranged with respect to the driving shaft.

2. The oil-free compressor according to claim 1, characterized in that: The sealing assembly comprises: A Variseal seal ring is disposed between the compression mechanism and the compression chamber.

3. The oil-free compressor according to claim 2, characterized in that: The sealing assembly further comprises: A back pressure ring abutting against the Variseal sealing ring; A first gasket and a first wear-resistant ring are both arranged on a side of the Variseal sealing ring away from the back pressure ring, and the first gasket is located between the first wear-resistant ring and the Variseal sealing ring; The second gasket and the second wear-resistant ring are both arranged on the side of the back pressure ring away from the Variseal sealing ring, and are spaced apart from the back pressure ring along the axial direction of the compression mechanism, and the second gasket is located between the back pressure ring and the second wear-resistant ring.

4. The oil-free compressor according to claim 1 or 3, characterized in that: The limit block is provided with a slot, and the eccentric wheel mechanism comprises a first bearing, and the outer ring of the first bearing is clamped in the slot.

5. The oil-free compressor according to claim 1, characterized in that: The compression mechanism includes a push rod, and the push rod is slidably connected in the guide bearing; The push rod is provided with a first guide surface, and the guide bearing is provided with a second guide surface for matching with the first guide surface.

6. The oil-free compressor according to claim 1, characterized in that: The balancing mechanism comprises: A counterweight block is connected to the driving shaft.

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