Cylinder self-adjusting device of linear compressor
By opening air float holes on the cylinder circumference of the linear compressor, the cylinder position is automatically adjusted by using the air buoyancy formed by the air film, the processing difficulties and friction problems caused by the small gap between the piston and cylinder are solved, and higher energy efficiency and longer service life are achieved.
Patent Information
- Application Number
- CN202421300926.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-06-07
AI Technical Summary
The extremely small gap between the piston and the cylinder in a linear compressor leads to difficult processing, increased costs, and friction problems, resulting in short life and low energy efficiency.
A linear compressor cylinder self-regulating device is designed. By opening a gas floating hole on the circumference of the cylinder, gas enters between the cylinder and the piston through the air floating hole, forming a uniform air film. The air buoyancy formed by the air film automatically adjusts the position of the cylinder to ensure that the piston and the cylinder are coaxial.
It reduces the accuracy and cost of piston and cylinder assembly, ensures coaxial operation of piston and cylinder, reduces friction damping, and improves the energy efficiency and service life of the entire machine.
Smart Images
Figure CN222936898U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of linear compressors, and particularly relates to a linear compressor cylinder self-adjusting device. Background Art
[0002] A linear compressor is driven by a linear motor. The piston assembly is driven by the linear motor to operate in the cylinder, and a clearance seal form is adopted between the piston and the cylinder. To improve energy efficiency, the clearance size at the clearance seal is usually extremely small, generally controlled at about 0.01 mm. Since the assembly accuracy of the whole machine is generally in millimeters, on the one hand, the extremely small clearance makes the processing extremely difficult. On the other hand, during the assembly process of the cylinder and the piston, there are extremely high requirements for the process and assembly method. Moreover, there is also a friction problem between the piston and the cylinder, resulting in a short lifespan and low energy efficiency of the linear compressor.
[0003] Therefore, it is urgent to design a linear compressor cylinder self-adjusting device to solve the problems mentioned above, that is, the extremely small clearance between the piston and the cylinder leads to difficult processing, increased costs, and the existing friction problem, resulting in a short lifespan and low energy efficiency of the linear compressor. Content of the Utility Model
[0004] To solve the technical problems mentioned in the background art, that is, the extremely small clearance between the piston and the cylinder leads to difficult processing, increased costs, and the existing friction problem, resulting in a short lifespan and low energy efficiency of the linear compressor, a linear compressor cylinder self-adjusting device is provided to solve the above problems.
[0005] To achieve the above purpose, the specific technical solution of the linear compressor cylinder self-adjusting device of the utility model is as follows:
[0006] A linear compressor cylinder self-adjusting device, characterized in that it includes a housing. A first chamber is arranged inside the housing. A cylinder is movably arranged in the first chamber. A piston is arranged inside the cylinder. The piston reciprocates along the axial direction of the cylinder. Air floating holes are formed on the circumferential surface of the cylinder. Gas enters between the cylinder and the piston through the air floating holes, and a uniform air film is formed between the cylinder and the piston. The air buoyancy formed by the air film enables the cylinder to automatically adjust its position so that the piston and the cylinder are coaxial.
[0007] Furthermore, the cylinder automatically adjusts its position in the radial direction of the first chamber inside the first chamber.
[0008] Furthermore, a second chamber and an air floating channel are also arranged inside the housing. An exhaust valve plate is arranged between the second chamber and the first chamber. One end of the air floating channel is communicated with the first chamber, and the other end of the air floating channel is communicated with the second chamber. Gas sequentially enters between the cylinder and the piston through the air floating channel and the air floating holes, so as to form a uniform air film between the cylinder and the piston.
[0009] Further, exhaust holes are provided on the exhaust valve plate, and exhaust valves are arranged at the exhaust holes. The exhaust valves open or close the exhaust holes to connect or cut off the second chamber and the first chamber.
[0010] Further, it further includes a third chamber and a linear motor. The third chamber is arranged on the side of the first chamber away from the second chamber. The piston is connected to the linear motor in the third chamber, and the linear motor drives the piston to reciprocate in the cylinder.
[0011] Further, it further includes a limit ring. The limit ring is fixedly sleeved in the first chamber. A first boss is arranged in the first chamber. One end of the cylinder abuts against the first boss, and the other end of the cylinder abuts against the limit ring.
[0012] Further, there are multiple rows of air floating holes, and the multiple rows of air floating holes are evenly arranged along the circumferential direction of the cylinder.
[0013] Further, the air floating hole is a T-shaped hole.
[0014] Further, it further includes a first seal and a second seal. First annular grooves and second annular grooves are spaced apart on the outer peripheral surface of the cylinder. The first seal is arranged in the first annular groove, and the second seal is arranged in the second annular groove. One end of the air floating channel connected to the first chamber is arranged between the first seal and the second seal.
[0015] Further, the inner diameter of the first chamber is larger than the outer diameter of the cylinder.
[0016] The linear compressor cylinder self-adjusting device of the present utility model has the following advantages:
[0017] By arranging a cylinder in the first chamber, air floating holes are provided on the circumferential surface of the cylinder, a piston is movably arranged in the cylinder, the piston reciprocates along the axial direction of the cylinder, air floating holes are provided on the circumferential surface of the cylinder, gas enters between the cylinder and the piston through the air floating holes, a uniform air film is formed between the cylinder and the piston, and the air buoyancy formed by the air film enables the cylinder to automatically adjust its position to make the piston and the cylinder coaxial. When assembling the piston and the cylinder, only after installing the cylinder, the piston needs to be inserted into the cylinder, which reduces the assembly precision of the piston and the cylinder, reduces the cost. At the same time, by setting the air floating holes, not only the coaxial operation of the piston and the cylinder is ensured, but also the friction damping between the piston and the cylinder is reduced, and the whole machine energy efficiency is improved. Description of the Drawings
[0018] Figure 1 is a schematic structural diagram of the linear compressor cylinder self-adjusting device of the present utility model;
[0019] Figure 2 is a schematic cross-sectional structural diagram of the linear compressor cylinder self-adjusting device of the present utility model Figure 1 ;
[0020] Figure 3 Schematic cross-sectional structure of the cylinder self-adjusting device of the linear compressor of the present utility model Figure 2 ;
[0021] Figure 4 is Figure 3 an enlarged schematic structure diagram of A in
[0022] Figure 5 Partial cross-sectional structure schematic of the cylinder self-adjusting device of the linear compressor of the present utility model Figure 1 ;
[0023] Figure 6 Partial cross-sectional structure schematic of the cylinder self-adjusting device of the linear compressor of the present utility model Figure 2 .
[0024] Explanation of the marks in the figure:
[0025] 1. Housing; 11. First chamber; 12. Second chamber; 121. First boss; 122. Aerostatic chamber; 123. Compression chamber; 13. Third chamber; 14. Aerostatic channel; 15. Exhaust port; 16. Return air port; 2. Exhaust valve plate; 21. Exhaust hole; 3. Cylinder; 31. Aerostatic hole; 4. Piston; 41. Second boss; 5. Limiting ring; 6. First seal; 7. Second seal; 8. Exhaust valve; 9. Linear motor; 100. First position; 101. Second position; 102. Third position; 103. Fourth position; 104. Fifth position. Specific embodiments
[0026] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0027] Those skilled in the art can understand that although some of the embodiments herein include certain features included in other embodiments but not other features, the combination of the features of different embodiments means that it is within the scope of the present utility model and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.
[0028] The following refers to the attached Figure 1 to the attached Figure 6 to describe the cylinder self-adjusting device of the linear compressor of the present utility model.
[0029] AsFigures 1 to 3 As shown in the figure, the linear compressor cylinder self-adjusting device in the present utility model includes a housing 1. A first chamber 11 is provided inside the housing 1. A cylinder 3 is movably arranged in the first chamber 11. A piston 4 is arranged inside the cylinder 3. The piston 4 reciprocates along the axial direction of the cylinder 3. Air floating holes 31 are formed on the circumferential surface of the cylinder 3. Gas enters between the cylinder 3 and the piston 4 through the air floating holes 31, and a uniform air film is formed between the cylinder 3 and the piston 4. The air buoyancy force formed by the air film enables the cylinder 3 to automatically adjust its position so that the piston 4 and the cylinder 3 are coaxial.
[0030] By arranging a cylinder 3 in the first chamber 11, air floating holes 31 are formed on the circumferential surface of the cylinder 3. A piston 4 is movably arranged inside the cylinder 3. The piston 4 reciprocates along the axial direction of the cylinder 3. Air floating holes 31 are formed on the circumferential surface of the cylinder 3. Gas enters between the cylinder 3 and the piston 4 through the air floating holes 31, and a uniform air film is formed between the cylinder 3 and the piston 4. The air buoyancy force formed by the air film enables the cylinder 3 to automatically adjust its position so that the piston 4 and the cylinder 3 are coaxial. When the piston 4 and the cylinder 3 are assembled, only after the cylinder 3 is installed, the piston 4 needs to be inserted into the cylinder 3, which reduces the assembly precision of the piston 4 and the cylinder 3 and reduces the cost. At the same time, by arranging the air floating holes 31, not only the coaxial operation of the piston 4 and the cylinder 3 is ensured, but also the friction damping between the piston 4 and the cylinder 3 is reduced, improving the overall energy efficiency of the machine. In this embodiment, multiple cylinders 3 can be arranged to cooperate with a single piston 4 to run, which can ensure the coaxiality of each cylinder 3 and the piston 4, and the length of the clearance seal between the piston 4 and the cylinder 3 can be adjusted arbitrarily. Compared with the prior art, in which the length of the clearance seal between the piston 4 and the cylinder 3 is too long, resulting in difficult processing and increased costs, the linear compressor cylinder self-adjusting device provided in this embodiment reduces the processing difficulty and processing cost. In this embodiment, the cylinder 3 automatically adjusts its position in the radial direction of the first chamber 11 in the first chamber 11.
[0031] Further, as Figures 2 to 5 shown, a second chamber 12 and an air floating channel 14 are also provided inside the housing 1. An exhaust valve plate 2 is arranged between the second chamber 12 and the first chamber 11. One end of the air floating channel 14 is communicated with the first chamber 11, and the other end of the air floating channel 14 is communicated with the second chamber 12. Gas sequentially enters between the cylinder 3 and the piston 4 through the air floating channel 14 and the air floating holes 31, so as to form a uniform air film between the cylinder 3 and the piston 4. Exhaust holes 21 are formed on the exhaust valve plate 2. An exhaust valve 8 is arranged at the exhaust holes 21. The exhaust valve 8 opens or closes the exhaust holes 21 to communicate or cut off the second chamber 12 and the first chamber 11. In this embodiment, the exhaust valve 8 is a one-way valve, and gas can only flow from the first chamber 11 into the second chamber 12 and cannot flow from the second chamber 12 into the first chamber 11.
[0032] Further, as Figures 2 to 5As shown in the figure, the linear compressor cylinder self-adjusting device in the present utility model further includes a third chamber 13 and a linear motor 9. The third chamber 13 is arranged on the side of the first chamber 11 away from the second chamber 12. The piston 4 is connected to the linear motor 9 in the third chamber 13, and the linear motor 9 drives the piston 4 to reciprocate in the cylinder 3. In this embodiment, the linear motor 9 includes a first yoke, a second yoke, a permanent magnet and a coil. The specific structure of the linear motor 9 is prior art and will not be elaborated here.
[0033] Furthermore, as Figures 2 to 5 shown in the figure, the linear compressor cylinder self-adjusting device in the present utility model further includes a limiting ring 5. The limiting ring 5 is fixedly sleeved in the first chamber 11. A first boss 121 is arranged in the first chamber 11. One end of the cylinder 3 abuts against the first boss 121, and the other end of the cylinder 3 abuts against the limiting ring 5. Through the first boss 121 and the limiting ring 5, axial limiting of the cylinder 3 is carried out to ensure that the cylinder 3 will not move in the axial direction, and the cylinder 3 automatically adjusts its position in the radial direction of the first chamber 11. In this embodiment, the inner diameter of the first chamber 11 is larger than the outer diameter of the cylinder 3, so that the cylinder 3 can move radially in its radial direction, facilitating the real-time adjustment of the position of the cylinder 3, making the cylinder 3 and the piston 4 always coaxial, and avoiding friction between the cylinder 3 and the piston 4 during the movement of the piston 4 in the cylinder 3 due to non-coaxiality between the cylinder 3 and the piston 4.
[0034] Furthermore, as Figures 2 to 5 shown in the figure, there are multiple rows of air-floating holes 31, and the multiple rows of air-floating holes 31 are evenly arranged along the circumferential direction of the cylinder 3. Each row of air-floating holes 31 includes multiple air-floating holes 31. In this embodiment, the cylinder 3 and the piston 4 divide the first chamber 11 into an air-floating chamber 122 and a compression chamber 123. The cylinder 3 and the inner wall of the first chamber 11 form the air-floating chamber 122, and the piston 4 and the inner wall of the cylinder 3 and the exhaust valve plate 2 form the compression chamber 123. The gas in the first chamber 11 enters the air-floating chamber 122 through the air-floating channel 14, and the gas in the air-floating chamber 122 enters the gap between the cylinder 3 and the piston 4 through the air-floating holes 31 to adjust the position of the cylinder 3 in the first chamber 11, making the cylinder 3 and the piston 4 coaxial, ensuring the uniformity of the gap between the cylinder 3 and the piston 4, and reducing the friction force when the piston 4 slides in the cylinder 3. In this embodiment, the air-floating holes 31 are T-shaped holes. Setting the air-floating holes 31 as T-shaped holes facilitates the gas in the air-floating chamber 122 to enter the gap between the cylinder 3 and the piston 4 through the air-floating holes 31.
[0035] A compression chamber 123 is formed among a piston 4, a cylinder 3 and an exhaust valve plate 2. Driven by a linear motor 9, when the piston 4 moves towards the exhaust valve plate 2, the gas in the compression chamber 123 is compressed. When the gas in the compression chamber 123 reaches a predetermined pressure, the high-pressure gas in the compression chamber 123 will push open the exhaust valve plate 2, and the high-pressure gas in the compression chamber 123 is discharged into the second chamber 12 through an exhaust hole 21. Most of the high-pressure gas in the second chamber 12 is discharged to the outside through an exhaust port 15, and a small part of the high-pressure gas in the second chamber 12 sequentially enters the air bearing chamber 122 through an air bearing channel 14. Since the piston 4 continuously moves towards the exhaust valve plate 2 and continuously compresses the air in the compression chamber 123, high-pressure gas continuously enters the air bearing chamber 122 through the air bearing channel 14. The air in the air bearing chamber 122 enters the gap between the cylinder 3 and the piston 4 through an air bearing hole 31, continuously adjusts the position of the cylinder 3 in its radial direction, makes the cylinder 3 and the piston 4 coaxial, ensures that the gap between the cylinder 3 and the piston 4 is uniform, and reduces the friction between the piston 4 and the cylinder 3 during the movement of the piston 4 in the cylinder 3. This not only improves the service life of the linear compressor but also improves the energy efficiency of the linear compressor.
[0036] When the piston 4 moves away from the exhaust valve plate 2, the compression chamber 123 enters the intake stage. At this time, the gas pressure in the compression chamber 123 is lower than the gas pressure in the air bearing chamber 122, and the air in the air bearing chamber 122 enters the gap between the cylinder 3 and the piston 4 through the air bearing hole 31, continuously adjusts the position of the cylinder 3 in its radial direction, makes the cylinder 3 and the piston 4 coaxial, ensures that the gap between the cylinder 3 and the piston 4 is uniform, and reduces the friction between the piston 4 and the cylinder 3 during the movement of the piston 4 in the cylinder 3. During the reciprocating movement of the piston 4 in the cylinder 3, high-pressure gas is stored in the air bearing chamber 122. The high-pressure gas forms an air bearing effect through the air bearing hole 31, thereby forming a uniform air film in the sealing gap. The gas buoyancy prompts the cylinder 3 to perform a radial displacement, self-adjusts the gap between the cylinder 3 and the piston 4, ensures that the cylinder 3 and the piston 4 are always in a coaxial running state, and at the same time reduces the friction between the piston 4 and the cylinder 3 during the process of the piston 4 in the cylinder 3. This not only improves the service life of the linear compressor but also improves the energy efficiency of the linear compressor. In this embodiment, the direction of gas flow is Figure 3 the direction indicated by the arrow in the figure.
[0037] Further, as Figures 2 to 6As shown in the figure, the linear compressor cylinder self-adjusting device in the present utility model further includes a first seal 6 and a second seal 7. First annular grooves and second annular grooves are spaced apart on the outer peripheral surface of the cylinder 3. The first seal 6 is arranged in the first annular groove, and the second seal 7 is arranged in the second annular groove. One end of the air floating channel 14 connected to the first chamber 11 is arranged between the first seal 6 and the second seal 7. In this embodiment, the first seal 6 has a first position 100, a second position 101, and a third position 102 in the first annular groove, and the second seal 7 has a fourth position 103 and a fifth position 104 in the second annular groove. When the first seal 6 is in the first position 100, the first seal 6 is at the bottom wall of the first annular groove. When the first seal 6 is in the second position 101, the first seal 6 is at the upper right of the first annular groove and abuts against the inner wall of the first chamber 11. When the first seal 6 is in the third position 102, the first seal 6 is at the upper left of the first annular groove and abuts against the inner wall of the first chamber 11. When the second seal 7 is in the fourth position 103, the second seal 7 is at the bottom wall of the second annular groove. When the second seal 7 is in the fifth position 104, the second seal 7 is at the upper left of the second annular groove and abuts against the inner wall of the first chamber 11.
[0038] Specifically, when the linear compressor is not working, the piston 4 does not move relative to the cylinder 3. The first seal 6 is in the first position 100, that is, the first seal 6 is at the bottom wall of the first annular groove, and the second seal 7 is in the fourth position 103, that is, the second seal 7 is at the bottom wall of the second annular groove.
[0039] When the linear compressor is working, under the drive of the linear motor 9, when the piston 4 moves in the direction close to the exhaust valve plate 2, the gas in the compression chamber 123 is compressed. When the pressure of the compressed gas is greater than the gas pressure in the air floating chamber 122, at this time, the first seal 6 expands and moves to the second position 101 under the action of the pressure difference. At the same time, under the action of the pressure difference, the second seal 7 expands and moves to the fifth position 104 to prevent the high-pressure gas in the air floating chamber 122 from leaking to the third chamber 13. When the gas in the compression chamber 123 reaches the predetermined pressure, the exhaust valve 8 opens, and the compressed gas enters the second chamber 12 and enters the air floating chamber 122 through the air floating channel 14. The gas in the air floating chamber 122 enters the gap between the piston 4 and the cylinder 3 through the air floating holes 31.
[0040] When the linear compressor is working, under the drive of the linear motor 9, when the piston 4 moves in the direction away from the exhaust valve plate 2, the compression chamber 123 enters the suction stage. At this time, the gas pressure in the compression chamber 123 is lower than the gas pressure in the air floating chamber 122. Under the action of the pressure difference, the first seal 6 moves to the third position 102, and the second seal 7 still remains in the fifth position 104 to prevent the gas in the air floating chamber 122 from leaking to the compression chamber 123 and the third chamber 13.
[0041] During the entire movement cycle, high-pressure gas is stored in the air-bearing cavity 122. The high-pressure gas forms an air-bearing effect through the air-bearing holes 31, thereby forming a uniform air film at the gap between the cylinder 3 and the piston 4. The gas buoyancy causes the cylinder 3 to perform a radial displacement, self-adjusting the gap between the cylinder 3 and the piston 4 to ensure that the cylinder 3 and the piston 4 are always in a coaxial running state.
[0042] Further, as Figures 1 to 3 shown, an exhaust port 15 and a return air port 16 are further provided on the housing 1. The exhaust port 15 is communicated with the second chamber 12, and the return air port 16 is communicated with the third chamber 13. Both the exhaust port 15 and the return air port 16 are communicated with the outside. The exhaust port 15 discharges the air inside the housing 1, and the return air port 16 is used to continuously supplement the outside air into the housing 1.
[0043] Further, as Figure 3 shown, when the piston 4 moves in the cylinder 3, in order to limit the movement of the piston 4, a second boss 41 is provided on the piston 4. The second boss 41 abuts against or separates from the end of the limit ring 5 away from the cylinder 3 to limit the movement stroke of the piston 4.
[0044] The working principle of the linear compressor cylinder self-adjusting device in the present utility model is as follows;
[0045] When the linear compressor is not working, the piston 4 does not move relative to the cylinder 3. The first seal 6 is in the first position 100, that is, the first seal 6 is at the bottom wall of the first annular groove. The second seal 7 is in the fourth position 103, that is, the second seal 7 is at the bottom wall of the second annular groove. There is no gas flow between the first chamber 11, the second chamber 12 and the third chamber 13.
[0046] When the linear compressor is operating, driven by the linear motor 9, when the piston 4 moves towards the exhaust valve plate 2, the gas in the compression chamber 123 is compressed. When the pressure of the compressed gas is greater than the pressure of the gas in the air bearing chamber 122, at this time, under the action of the pressure difference, the first seal 6 expands and moves to the second position 101. At the same time, under the action of the pressure difference, the second seal 7 expands and moves to the fifth position 104 to prevent the high-pressure gas in the air bearing chamber 122 from leaking into the third chamber 13. When the gas in the compression chamber 123 reaches the predetermined pressure, the high-pressure gas in the compression chamber 123 will push open the exhaust valve plate 2, and the high-pressure gas in the compression chamber 123 is discharged into the second chamber 12 through the exhaust hole 21. Most of the high-pressure gas in the second chamber 12 is discharged to the outside through the exhaust port 15, and a small part of the high-pressure gas in the second chamber 12 sequentially enters the air bearing chamber 122 through the air bearing channel 14. Since the piston 4 continuously moves towards the exhaust valve plate 2 and continuously compresses the air in the compression chamber 123, continuous high-pressure gas enters the air bearing chamber 122 through the air bearing channel 14. The air in the air bearing chamber 122 enters the gap between the cylinder 3 and the piston 4 through the air bearing hole 31, continuously adjusting the position of the cylinder 3 in its radial direction, making the cylinder 3 and the piston 4 coaxial, ensuring that the gap between the cylinder 3 and the piston 4 is uniform, and reducing the friction between the piston 4 and the cylinder 3 during the movement of the cylinder 3 within the piston 4. This not only improves the service life of the linear compressor but also improves the energy efficiency of the linear compressor.
[0047] When the linear compressor is operating, driven by the linear motor 9, when the piston 4 moves away from the exhaust valve plate 2, the compression chamber 123 enters the suction stage. At this time, the gas pressure in the compression chamber 123 is lower than the gas pressure in the air bearing chamber 122. Under the action of the pressure difference, the first seal 6 moves to the third position 102, and the second seal 7 still remains at the fifth position 105 to prevent the gas in the air bearing chamber 122 from leaking into the compression chamber 123 and the third chamber 13. At this time, the gas pressure in the compression chamber 123 is lower than the gas pressure in the air bearing chamber 122, and the air in the air bearing chamber 122 enters the gap between the cylinder 3 and the piston 4 through the air bearing hole 31, continuously adjusting the position of the cylinder 3 in the radial direction, making the cylinder 3 and the piston 4 coaxial, ensuring that the gap between the cylinder 3 and the piston 4 is uniform, and reducing the friction between the piston 4 and the cylinder 3 during the movement of the cylinder 3 within the piston 4. During the reciprocating movement of the piston 4 within the cylinder 3, high-pressure gas is stored in the air bearing chamber 122. The high-pressure gas forms an air bearing effect through the air bearing hole 31, thereby forming a uniform air film within the sealing gap. The gas buoyancy causes the cylinder 3 to perform a radial displacement, self-adjusting the gap between the cylinder 3 and the piston 4, ensuring that the cylinder 3 and the piston 4 are always in a coaxial operating state, and at the same time reducing the friction between the piston 4 and the cylinder 3 during the process. This not only improves the service life of the linear compressor but also improves the energy efficiency of the linear compressor.
[0048] During the entire motion cycle, high-pressure gas is stored in the air-bearing cavity 122. The high-pressure gas forms an air-bearing effect through the air-bearing holes 31, thereby forming a uniform air film at the gap between the cylinder 3 and the piston 4. The gas buoyancy forces the cylinder 3 to perform a radial displacement, self-adjusting the gap between the cylinder 3 and the piston 4 to ensure that the cylinder 3 and the piston 4 are always in a coaxial running state.
[0049] Obviously, the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill 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 enumerate all the embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A linear compressor cylinder self-adjusting device, characterized in that: The utility model comprises a shell, a first chamber is arranged in the shell, a cylinder is movably arranged in the first chamber, a piston is arranged in the cylinder, the piston reciprocates along the axis direction of the cylinder, air flotation holes are opened on the circumference of the cylinder, gas enters between the cylinder and the piston through the air flotation holes, and a uniform air film is formed between the cylinder and the piston. The air flotation force formed by the air film enables the cylinder to automatically adjust its position so that the piston and the cylinder are coaxial.
2. The linear compressor cylinder self-adjusting device according to claim 1, characterized in that: The cylinder automatically adjusts its position in the first chamber along the radial direction of the first chamber.
3. The linear compressor cylinder self-adjusting device according to claim 1, characterized in that: A second chamber and an air flotation channel are also provided in the shell, an exhaust valve plate is provided between the second chamber and the first chamber, one end of the air flotation channel is connected to the first chamber, and the other end of the air flotation channel is connected to the second chamber, and the gas enters between the cylinder and the piston through the air flotation channel and the air flotation hole in turn to form a uniform air film between the cylinder and the piston.
4. The linear compressor cylinder self-adjusting device according to claim 3, characterized in that: An exhaust hole is provided on the exhaust valve plate, and an exhaust valve is arranged at the exhaust hole. The exhaust valve opens or closes the exhaust hole to connect or isolate the second chamber from the first chamber.
5. The linear compressor cylinder self-adjusting device according to claim 3, characterized in that: It also includes a third chamber and a linear motor. The third chamber is arranged on a side of the first chamber away from the second chamber. The piston is connected to the linear motor in the third chamber. The linear motor drives the piston to reciprocate in the cylinder.
6. The linear compressor cylinder self-adjusting device according to claim 1, characterized in that: It also includes a limiting ring, which is fixedly sleeved in the first chamber. A first boss is arranged in the first chamber. One end of the cylinder abuts against the first boss, and the other end of the cylinder abuts against the limiting ring.
7. The linear compressor cylinder self-adjusting device according to claim 1, characterized in that: The air flotation holes are arranged in multiple rows, and the multiple air flotation holes are evenly arranged along the circumferential direction of the cylinder.
8. The linear compressor cylinder self-adjusting device according to claim 1, characterized in that: The air flotation hole is a T-shaped hole.
9. The linear compressor cylinder self-adjusting device according to claim 1, characterized in that: It also includes a first seal and a second seal. A first annular groove and a second annular groove are spaced apart on the outer circumferential surface of the cylinder. The first seal is arranged in the first annular groove, and the second seal is arranged in the second annular groove. The end of the flotation channel connected to the first chamber is arranged between the first seal and the second seal.
10. The linear compressor cylinder self-adjusting device according to claim 1, characterized in that: The inner diameter of the first chamber is larger than the outer diameter of the cylinder.