A labyrinth piston for a compressor

Abstract

A labyrinth piston for a compressor relates to the technical field of compressors and includes a cylinder head, a valve plate, a cylinder block, and a casing arranged in sequence from top to bottom. A cylinder sleeve penetrating the cylinder block is inserted at the top of the cylinder block, an upper port of the cylinder sleeve abuts against the valve plate, and a piston body is provided inside the cylinder sleeve for vertical reciprocating movement. The piston body includes an upper piston body, a lower piston body, and a piston body arranged in sequence from top to bottom. The upper piston body, the lower piston body, and the piston body are detachably connected. A plurality of labyrinth grooves are provided axially on the outer wall of the piston body. A plurality of detachably arranged support rings are circumferentially inserted on the outer walls of the upper piston body and the piston body. Circular holes are provided on the tops of the upper piston body and the lower piston body. An installation groove and a fixing groove are provided on the bottom of the lower piston body and the top of the piston body. A filter plate and a fixing ring are provided between the lower piston body and the piston body. The present invention solves the problem of abnormal wear of the cylinder wall and key sealing parts of the labyrinth groove of the existing labyrinth piston.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, in particular to a labyrinth piston for a compressor. Background Art

[0002] The labyrinth piston for compressors features a specially designed piston structure, featuring a series of annular grooves (labyrinth grooves) machined into the piston's flanks, creating a tortuous sealing path. Its core principle is to utilize the multiple expansions, throttling effects, and eddy current dissipation of gas as it passes through the labyrinth grooves to significantly reduce leakage while avoiding the friction and wear associated with traditional piston ring contact seals. This system relies on gas dynamics to prevent leakage and reduce mechanical friction between the piston and cylinder wall. It is primarily used in the transportation of gases containing particulates.

[0003] Labyrinth pistons are typically equipped with dedicated support rings. These rings consist of two to four curved lobes and are mounted on the top and bottom of the piston, away from the labyrinth grooves. Dedicated mounting grooves are located on the piston's outer wall to secure the rings and maintain contact with the cylinder wall. These rings are made from self-lubricating, low-thermal-expansion non-metallic materials, such as polytetrafluoroethylene (PTFE)-filled materials, graphite composites, and ceramic coatings. These materials release lubricants or form a lubricating layer on the contact surface during friction, effectively reducing friction and wear. Self-lubricating materials have limited sealing performance under high differential pressures (they can be squeezed and deformed under these conditions, leading to seal failure). Therefore, the support rings' primary function is limited to radial support and guidance of the piston, while the labyrinth groove structure provides airtightness. This combined design offers advantages such as oil-free lubrication, low overall wear, and long service life, while completely eliminating the risk of lubricant contamination of the medium.

[0004] The existing labyrinth piston gradually exposed its shortcomings during use, mainly in the following aspects:

[0005] Labyrinth compressors are primarily used for compressing and conveying gases containing dust or particulate impurities. During operation, solid particles in the medium are carried by the airflow into the labyrinth grooves and deposited there. As the operating time increases and the particle accumulation in the labyrinth grooves reaches a critical value, the high-speed reciprocating motion of the pistons causes these particles to become abrasives, which not only intensifies scratches on the cylinder walls but also causes abnormal wear of key sealing areas in the labyrinth grooves. This wear significantly reduces sealing effectiveness, increases gas leakage, and irreversibly increases the piston clearance, seriously affecting the operating efficiency and service life of the compressor. This wear problem is particularly prominent in conditions with high dust concentrations or those containing hard particles.

[0006] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0007] In response to the defects in the existing technology, the technical problem to be solved by the present invention is to provide a labyrinth piston for a compressor, which can effectively block solid particles in the medium from entering the labyrinth groove, avoiding abnormal wear of the cylinder wall and the labyrinth groove section due to particle accumulation, and significantly improving the service life of the equipment.

[0008] In order to solve the above problems, the present invention provides the following technical solutions:

[0009] A labyrinth piston for a compressor comprises a cylinder head, a valve plate, a cylinder block and a casing arranged in sequence from top to bottom, a cylinder sleeve penetrating the cylinder block is inserted on the top of the cylinder block, an upper port of the cylinder sleeve is abutted against the valve plate, a piston body is provided inside the cylinder sleeve for vertical reciprocating movement, the piston body comprises an upper piston body, a lower piston body and a piston main body arranged in sequence from top to bottom, the upper piston body, the lower piston body and the piston main body are detachably connected, a plurality of labyrinth grooves are provided on the outer wall of the piston main body along the axial direction, a plurality of detachable support rings are circumferentially inserted on the outer walls of the upper piston body and the piston main body, a circular hole is penetrated on the top of the upper piston body and the lower piston body, the piston The bottom of the lower body and the top of the piston main body are both provided with a mounting groove and a fixing groove, a filter plate and a fixing ring are provided between the piston lower body and the piston main body, the filter plate and the fixing ring are respectively located in the mounting groove and the fixing groove and are both against the piston lower body and the piston main body, the support ring and the fixing ring are both in friction contact with the cylinder liner, a circular groove is provided on the top of the piston main body, the outer walls of the piston lower body and the piston main body are both provided with a plurality of connecting channels along the circumferential direction, one end of the connecting channel is connected with the circular hole or the circular groove, two mounting holes are provided through the top of the valve plate, the upper ports of the two mounting holes are respectively installed with an intake valve and an outlet valve, the upper ports of the intake valve and the outlet valve extend to the outside of the cylinder head.

[0010] As an optimized solution, a ventilation groove is provided on the top of the piston lower body along the circumference of the circular hole, and a plurality of exhaust holes connected to the ventilation groove are provided on the inner wall of the circular hole of the piston lower body. The exhaust holes are inclined downward, and an air inlet hole connected to the ventilation groove is provided through the top of the piston upper body. A ventilation pipe connected to the air inlet valve is fixed in one of the mounting holes, and the ventilation pipe extends downward into the air inlet hole and is slidingly and sealingly connected to the piston upper body.

[0011] As an optimized solution, the outer wall of the ventilation pipe is fixedly sleeved with a sealing ring that is in frictional contact with the inner wall of the air inlet hole.

[0012] As an optimized solution, the cylinder head, valve plate and cylinder body are detachably connected, the casing and cylinder body are detachably connected, a crankshaft is rotatably provided inside the casing, a connecting rod is provided between the piston body and the crankshaft, both ends of the connecting rod are rotatably connected to the piston body and the crankshaft, and one end of the crankshaft extends through the casing to the outside and is connected to the driving device.

[0013] As an optimized solution, a plurality of positioning columns are fixed on the top of the piston body, and a plurality of positioning holes are penetrated on the top of the piston upper body and the piston lower body. Positioning bolts threadedly connected to the positioning columns are provided in the positioning holes of the piston upper body.

[0014] As an optimized solution, the outer walls of the piston upper body and the piston main body are provided with a built-in groove around them, and the outer walls of the piston upper body and the piston main body are provided with a plurality of insertion grooves along the circumference, and the support ring is inserted into the insertion groove. The support ring is fixed to the piston upper body or the outer wall of the piston main body by a retaining spring, and the retaining spring is located in the built-in groove.

[0015] As an optimized solution, a plurality of fixing columns are fixedly provided at the bottom of the fixing groove of the piston body, and the fixing ring is inserted into the fixing columns.

[0016] As an optimized solution, the fixing ring and the filter plate are both located between the piston lower body communicating channel and the piston main body communicating channel.

[0017] As an optimized solution, the support ring and the fixing ring are both made of non-metallic materials with self-lubricity and low thermal expansion coefficient.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The rotation of the crankshaft drives the piston body to move vertically back and forth in the cylinder sleeve. The support rings on the upper body of the piston and the outer wall of the piston body are in contact with the cylinder sleeve and provide radial support. The gas on the upper and lower sides of the labyrinth groove undergoes multiple expansions, throttling effects and eddy current dissipation when passing through the labyrinth groove, and finally forms a pressure gradient, which significantly reduces the gas leakage and achieves a sealing effect. When the piston body moves downward, the air pressure inside the cylinder sleeve decreases, and the gas containing dust enters the cylinder sleeve in one direction through the intake valve. When the piston body moves upward, the air pressure inside the cylinder sleeve increases. When the pressure in the cylinder exceeds the back pressure of the outlet valve, the outlet valve is pushed open, and the high-pressure gas containing dust is discharged in one direction through the outlet valve. The gas containing dust enters the cylinder sleeve through the intake valve. During the process of passing through the cylinder sleeve, some dust is adsorbed on the inner wall of the cylinder sleeve. When the piston body moves upward, the fixed ring scrapes the dust adsorbed on the inner wall of the cylinder sleeve to prevent the dust from entering the labyrinth groove. When the piston body moves upward, the air pressure inside the cylinder sleeve increases, and a pressure difference is formed inside and outside. Part of the high-pressure gas in the cylinder sleeve escapes into the labyrinth groove. The high-pressure gas containing dust in the cylinder sleeve must pass through the filter plate when escaping into the labyrinth groove. The filter plate filters the dust in the gas, and the filtered gas enters the labyrinth groove through the circular groove and the connecting channel. The labyrinth piston can effectively prevent solid particles in the medium from entering the labyrinth groove, avoiding abnormal wear of the cylinder sleeve inner wall and the labyrinth groove section due to particle accumulation, and significantly improving the service life of the equipment.

[0020] 2. The retaining ring is made of a non-metallic material with self-lubrication and low thermal expansion coefficient. It cannot work under high pressure differentials (self-lubricating materials will be squeezed and deformed under high pressure differentials). The connecting channel on the piston lower body and the outer wall of the piston main body ensures that the pressure on the upper and lower sides of the retaining ring is equal, effectively preventing the retaining ring from being deformed due to high pressure differentials. In turn, the retaining ring can continuously scrape dust from the inner wall of the cylinder liner to prevent dust from entering the labyrinth groove.

[0021] 3. When the piston body moves downward, the piston upper body and the vent pipe slide relative to each other, the internal air pressure of the cylinder liner decreases, and a pressure difference is formed inside and outside. The external air enters the vent groove through the intake valve and the vent pipe. The gas in the vent groove is sprayed to the top surface of the filter plate through the exhaust hole, thereby blowing up the dust trapped on the top surface of the filter plate to prevent the filter plate from being blocked by dust. Part of the blown gas flows through the connecting channel on the outer wall of the piston lower body, thereby blowing up the dust deposited on the top surface of the fixed ring. The labyrinth piston can effectively prevent dust from depositing on the top surface of the fixed ring and prevent the filter plate from being blocked, thereby improving practicality.

[0022] 4. The labyrinth piston adopts a modular detachable connection design. During maintenance, only the connecting parts need to be removed for repair and replacement, which improves the convenience of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the casing and the interior of the cylinder body of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure inside the cylinder liner of the present invention;

[0027] Figure 4 Schematic diagram of the structure of the piston body of the present invention;

[0028] Figure 5 A cross-sectional view of the piston upper body, piston lower body and piston main body of the present invention;

[0029] Figure 6 This is an exploded view of the piston upper body, piston lower body and piston main body of the present invention;

[0030] Figure 7 Schematic diagram of the structure of the valve plate of the present invention;

[0031] Figure 8 Schematic diagram of the structure of the piston upper body of the present invention;

[0032] Figure 9 Schematic diagram of the structure of the piston body of the present invention;

[0033] Figure 10 It is a structural schematic diagram of the piston lower body of the present invention.

[0034] In the figure: 1- casing; 2- cylinder block; 3- valve plate; 4- cylinder head; 5- crankshaft; 6- connecting rod; 7- cylinder liner; 8- exhaust valve; 9- intake valve; 10- piston body; 11- sealing ring; 12- vent pipe; 13- mounting hole; 14- piston body; 15- positioning column; 16- ventilation groove; 17- piston lower body; 18- exhaust hole; 19- piston upper body; 20- positioning bolt; 21- circular hole; 22- intake hole; 23- support ring; 24- retaining ring; 25- positioning hole; 26- filter plate; 27- labyrinth groove; 28- circular groove; 29- fixing column; 30- communicating channel; 31- fixing groove; 32- fixing ring; 33- mounting groove; 34- insertion groove; 35- built-in groove. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0036] like Figures 1 to 10 As shown, a labyrinth piston for a compressor comprises a cylinder head 4, a valve plate 3, a cylinder block 2 and a casing 1 arranged in sequence from top to bottom, a cylinder sleeve 7 penetrating the cylinder block 2 is inserted on the top of the cylinder block 2, an upper port of the cylinder sleeve 7 abuts against the valve plate 3, a piston body 10 is provided inside the cylinder sleeve 7 for vertical reciprocating movement, the piston body 10 comprises a piston upper body 19, a piston lower body 17 and a piston main body 14 arranged in sequence from top to bottom, the piston upper body 19, the piston lower body 17 and the piston main body 14 are detachably connected, a plurality of labyrinth grooves 27 are provided on the outer wall of the piston main body 14 along the axial direction, a plurality of detachable support rings 23 are circumferentially inserted on the outer walls of the piston upper body 19 and the piston main body 14, a circular hole 21 is penetrated on the top of the piston upper body 19 and the piston lower body 17, and a bottom of the piston lower body 17 and The top of the piston main body 14 is provided with a mounting groove 33 and a fixing groove 31, and a filter plate 26 and a fixing ring 32 are provided between the piston lower body 17 and the piston main body 14. The filter plate 26 and the fixing ring 32 are respectively located in the mounting groove 33 and the fixing groove 31 and are both against the piston lower body 17 and the piston main body 14. The support ring 23 and the fixing ring 32 are in friction contact with the cylinder liner 7. A circular groove 28 is provided on the top of the piston main body 14, and the outer walls of the piston lower body 17 and the piston main body 14 are provided with a plurality of connecting channels 30 along the circumferential direction. One end of the connecting channel 30 is connected to the circular hole 21 or the circular groove 28. Two mounting holes 13 are provided through the top of the valve plate 3. The upper ports of the two mounting holes 13 are respectively installed with the intake valve 9 and the outlet valve 8. The upper ports of the intake valve 9 and the outlet valve 8 extend to the outside of the cylinder head 4.

[0037] A ventilation groove 16 is provided on the top of the piston lower body 17 along the circumference of the circular hole 21, and a plurality of exhaust holes 18 connected to the ventilation groove 16 are provided on the inner wall of the circular hole 21 of the piston lower body 17. The exhaust holes 18 are inclined downward, and an air inlet hole 22 connected to the ventilation groove 16 is penetrated from the top of the piston upper body 19. A ventilation pipe 12 connected to the intake valve 9 is fixed in one of the mounting holes 13. The ventilation pipe 12 extends downward into the air inlet hole 22 and is slidingly and sealingly connected to the piston upper body 19.

[0038] A sealing ring 11 is fixedly mounted on the outer wall of the vent pipe 12 and is in frictional contact with the inner wall of the air inlet hole 22 .

[0039] The cylinder head 4, the valve plate 3 and the cylinder body 2 are detachably connected, and the casing 1 and the cylinder body 2 are detachably connected. A crankshaft 5 is rotatably provided inside the casing 1, and a connecting rod 6 is provided between the piston body 14 and the crankshaft 5. Both ends of the connecting rod 6 are rotatably connected to the piston body 14 and the crankshaft 5 respectively. One end of the crankshaft 5 extends through the casing 1 to the outside and is connected to the driving device.

[0040] A plurality of positioning columns 15 are fixedly provided on the top of the piston body 14 , and a plurality of positioning holes 25 are penetrated through the tops of the piston upper body 19 and the piston lower body 17 . Positioning bolts 20 threadedly connected to the positioning columns 15 are provided in the positioning holes 25 of the piston upper body 19 .

[0041] The outer walls of the piston upper body 19 and the piston main body 14 are provided with a built-in groove 35 around them. The outer walls of the piston upper body 19 and the piston main body 14 are provided with a plurality of insertion grooves 34 along the circumferential direction. The support ring 23 is inserted into the insertion groove 34. The support ring 23 is fixed to the piston upper body 19 or the outer wall of the piston main body 14 by a retaining spring 24, and the retaining spring 24 is located in the built-in groove 35.

[0042] A plurality of fixing columns 29 are fixedly provided at the bottom of the fixing groove 31 of the piston body 14 , and the fixing rings 32 are inserted into the fixing columns 29 .

[0043] The fixing ring 32 and the filter plate 26 are both located between the communicating passage 30 of the piston lower body 17 and the communicating passage 30 of the piston main body 14 .

[0044] The support ring 23 and the fixing ring 32 are both made of non-metallic materials with self-lubricity and low thermal expansion coefficient.

[0045] The working principle of this device is:

[0046] The rotation of the crankshaft 5 drives the piston body 14 to move vertically back and forth in the cylinder liner 7. The piston upper body 19 and the support ring 23 on the outer wall of the piston body 14 are in contact with the cylinder liner 7 and provide radial support. The gas on the upper and lower sides of the labyrinth groove 27 undergoes multiple expansions, throttling effects and eddy current dissipation when passing through the labyrinth groove 27, and finally forms a pressure difference gradient, which significantly reduces the gas leakage, thereby achieving a sealing effect. When the piston body 14 moves downward, the air pressure inside the cylinder liner 7 decreases, and the gas containing dust enters the cylinder liner 7 in a one-way manner through the intake valve 9. When the piston body 14 moves upward, the air pressure inside the cylinder liner 7 increases. When the pressure in the cylinder liner 7 exceeds the back pressure of the outlet valve 8, the outlet valve 8 is pushed open, and the high-pressure gas containing dust is discharged in a one-way manner through the outlet valve 8. The gas containing dust enters the cylinder liner 7 through the intake valve 9. During the internal process, some dust is adsorbed on the inner wall of the cylinder liner 7. When the piston body 14 moves upward, the fixed ring 32 scrapes the dust adsorbed on the inner wall of the cylinder liner 7 to prevent the dust from entering the labyrinth groove 27. When the piston body 14 moves upward, the internal air pressure of the cylinder liner 7 increases, and a pressure difference is formed inside and outside. Part of the high-pressure gas in the cylinder liner 7 escapes into the labyrinth groove 27. The high-pressure gas containing dust in the cylinder liner 7 must pass through the filter plate 26 when escaping into the labyrinth groove 27. The filter plate 26 filters the dust in the gas, and the filtered gas enters the labyrinth groove 27 through the circular groove 28 and the connecting channel 30. The labyrinth piston can effectively prevent solid particles in the medium from entering the labyrinth groove 27, avoiding abnormal wear of the inner wall of the cylinder liner 7 and the labyrinth groove section due to particle accumulation, thereby significantly improving the service life of the equipment.

[0047] The retaining ring 32 is made of a non-metallic material with self-lubrication and a low thermal expansion coefficient. It cannot operate under high pressure differentials (self-lubricating materials would be squeezed and deformed under high pressure differentials). The connecting channel 30 on the outer wall of the piston lower body 17 and the piston main body 14 ensures that the pressure on the upper and lower sides of the retaining ring 32 is the same, effectively preventing the retaining ring 32 from being deformed due to the high pressure differential. This ensures that the retaining ring 32 can continuously scrape dust from the inner wall of the cylinder liner 7 and prevent dust from entering the labyrinth groove 27.

[0048] When the piston body 14 moves downward, the piston upper body 19 and the vent pipe 12 slide relative to each other, the internal air pressure of the cylinder liner 7 decreases, and a pressure difference is formed inside and outside. The external gas enters the vent groove 16 through the intake valve 9 and the vent pipe 12, and the gas in the vent groove 16 is sprayed toward the top surface of the filter plate 26 through the exhaust hole 18, thereby blowing up the dust trapped on the top surface of the filter plate 26 to prevent the filter plate 26 from being blocked by dust. Part of the blown gas flows through the connecting channel 30 on the outer wall of the piston lower body 17, thereby blowing up the dust deposited on the top surface of the fixing ring 32. The labyrinth piston can effectively prevent dust from being deposited on the top surface of the fixing ring 32, and can also prevent the filter plate 26 from being blocked, thereby improving practicality.

[0049] The labyrinth piston adopts a modular detachable connection design. During maintenance, only the connecting parts need to be removed for repair and replacement, which improves the convenience of maintenance.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A labyrinth piston for a compressor, characterized in that: The invention comprises a cylinder head (4), a valve plate (3), a cylinder block (2) and a casing (1) arranged in sequence from top to bottom, wherein a cylinder sleeve (7) penetrating the cylinder block (2) is inserted on the top of the cylinder block (2), an upper end of the cylinder sleeve (7) abuts against the valve plate (3), and a piston body (10) is provided inside the cylinder sleeve (7) for vertical reciprocating movement, wherein the piston body (10) comprises a piston upper body (19), a piston lower body (17) and a piston main body (14) arranged in sequence from top to bottom, wherein the piston upper body (19), the piston lower body (17) and the piston main body (14) are provided. The piston body (17) and the piston body (14) are detachably connected, the outer wall of the piston body (14) is provided with a plurality of labyrinth grooves (27) along the axial direction, the outer walls of the piston upper body (19) and the piston body (14) are both circumferentially inserted with a plurality of detachably arranged support rings (23), the tops of the piston upper body (19) and the piston lower body (17) are both penetrated by circular holes (21), the bottom of the piston lower body (17) and the top of the piston body (14) are both provided with mounting grooves (33) and fixing grooves (31), A filter plate (26) and a fixing ring (32) are provided between the piston lower body (17) and the piston main body (14). The filter plate (26) and the fixing ring (32) are respectively located in the mounting groove (33) and the fixing groove (31) and are both against the piston lower body (17) and the piston main body (14). The support ring (23) and the fixing ring (32) are both in frictional contact with the cylinder sleeve (7). A circular groove (28) is provided on the top of the piston main body (14). The outer walls of the piston lower body (17) and the piston main body (14) are A plurality of communication channels (30) are provided along the circumferential direction, one end of the communication channel (30) on the piston lower body (17) is communicated with the circular hole (21), and one end of the communication channel (30) on the piston main body (14) is communicated with the circular groove (28), and two mounting holes (13) are provided through the top of the valve plate (3), and an intake valve (9) and an outlet valve (8) are respectively installed at the upper ends of the two mounting holes (13), and the upper ends of the intake valve (9) and the outlet valve (8) are extended to the outside of the cylinder head (4); The fixing ring (32) and the filter plate (26) are both located between the communicating channel (30) of the piston lower body (17) and the communicating channel (30) of the piston main body (14).

2. A labyrinth piston for a compressor according to claim 1, characterized in that: A ventilation groove (16) is provided on the top of the piston lower body (17) along the circumference of the circular hole (21), and a plurality of exhaust holes (18) connected to the ventilation groove (16) are provided on the inner wall of the circular hole (21) of the piston lower body (17), and the exhaust holes (18) are inclined downward. An air inlet hole (22) connected to the ventilation groove (16) is provided through the top of the piston upper body (19), and a ventilation pipe (12) connected to the air inlet valve (9) is fixed in one of the mounting holes (13). The ventilation pipe (12) extends downward into the air inlet hole (22) and is slidably and sealedly connected to the piston upper body (19).

3. A labyrinth piston for a compressor according to claim 2, characterized in that: The outer wall of the vent pipe (12) is fixedly sleeved with a sealing ring (11) that is in frictional contact with the inner wall of the air inlet hole (22).

4. The labyrinth piston for a compressor according to claim 1, characterized in that: The cylinder head (4), the valve plate (3) and the cylinder body (2) are detachably connected, the casing (1) and the cylinder body (2) are detachably connected, a crankshaft (5) is rotatably provided inside the casing (1), a connecting rod (6) is provided between the piston body (14) and the crankshaft (5), two ends of the connecting rod (6) are rotatably connected to the piston body (14) and the crankshaft (5), and one end of the crankshaft (5) passes through the casing (1) and extends to the outside and is connected to the driving device.

5. The labyrinth piston for a compressor according to claim 2, characterized in that: A plurality of positioning columns (15) are fixedly provided on the top of the piston body (14), and a plurality of positioning holes (25) are penetrated through the tops of the piston upper body (19) and the piston lower body (17). Positioning bolts (20) threadedly connected to the positioning columns (15) are provided in the positioning holes (25) of the piston upper body (19).

6. The labyrinth piston for a compressor according to claim 1, characterized in that: The outer walls of the piston upper body (19) and the piston main body (14) are both provided with a built-in groove (35) around them. The outer walls of the piston upper body (19) and the piston main body (14) are both provided with a plurality of insertion grooves (34) along the circumferential direction. The support ring (23) is inserted into the insertion groove (34). The support ring (23) is fixed to the outer walls of the piston upper body (19) and the piston main body (14) respectively through a retaining spring (24). The retaining spring (24) is located in the built-in groove (35).

7. The labyrinth piston for a compressor according to claim 1, characterized in that: A plurality of fixing columns (29) are fixedly provided at the bottom of the fixing groove (31) of the piston body (14), and the fixing ring (32) is inserted into the fixing columns (29).

8. The labyrinth piston for a compressor according to claim 1, characterized in that: The support ring (23) and the fixing ring (32) are both made of non-metallic materials with self-lubricity and low thermal expansion coefficient.

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