A reciprocating three-stage ultra-high pressure air compressor

Abstract

This invention belongs to the field of air compression technology and relates to an ultra-high pressure air compressor with a three-stage piston compression system. It includes a three-stage piston compression structure consisting of a main piston, a main cylinder, a third-stage cylinder, and a third-stage piston. The first and second stages of compression are respectively located in the moving space between the piston head and the piston outer wall surface and the cylinder inner wall surface. The piston and cylinder have two working diameters. During the periodic reciprocating motion of the piston, a periodic changing space is formed between the piston end and the piston and cylinder wall, achieving two stages of compression within a single piston and cylinder. This technology enables ultra-high pressure air compression, achieving an air filling capacity of over 15 MPa, which is crucial for restoring the operational capability of pneumatic control systems and reducing reliance on ground-based high-pressure filling equipment.

Description

Technical Field

[0001] This invention belongs to the field of air compression technology, and is a piston-type three-stage compression ultra-high pressure air compressor. Background Technology

[0002] High-pressure air compressors play a crucial role in pneumatic control and are widely used in aircraft and ground equipment. In aircraft, the pneumatic control system operates by utilizing the principle that high-pressure air stored in cylinders performs work upon expansion. Each operation consumes the pressure energy in the cylinder, gradually reducing its pressure. The function of the air compressor is to replenish the pressure energy in the cylinders of the pneumatic control system. Controlled by the system's automatic pressure regulator, when the original pressure in the cylinder drops to a certain limit, it begins to refill the cylinder, increasing the pressure energy to restore and maintain its operational capability. In ground machinery, air compressors provide power to mechanical aerodynamic equipment and systems, supplying high-pressure air to drive machinery. In existing technologies using high-pressure cylinders, the cylinders rely on ground equipment for high-pressure filling, and as the compressed air in the cylinders is consumed, continuous pneumatic operation capability cannot be provided. Furthermore, traditional air compressors often have low outlet pressures; for example, centrifugal and single-piston compressors typically have a single-stage pressure not exceeding 1 MPa, which is insufficient to meet the filling requirements of high-pressure storage cylinders. Summary of the Invention

[0003] Purpose of the invention This invention employs a three-stage piston air compressor technology to achieve ultra-high pressure gas cylinder filling. It can be applied to gas cylinder filling in aircraft aerodynamic control systems and mechanical high-pressure air drive systems. The invention utilizes a three-stage piston air compressor design, where an electric motor drives a crankshaft and crank arm, causing two pistons to reciprocate, forming a three-stage piston compression process. The second and third stage pistons are cleverly positioned between the cylinder wall and the piston, thus achieving three-stage compression and enabling ultra-high pressure air compression. It can achieve an air filling capacity of over 15 MPa, which is crucial for restoring the operational capability of a pneumatic control system and also reduces reliance on ground-based high-pressure filling equipment.

[0004] Technical solution A reciprocating three-stage compression ultra-high pressure air compressor includes a main piston, a main cylinder, a third-stage cylinder, and a third-stage piston forming a three-stage piston compression structure. The main cylinder and the third-stage cylinder are arranged at 90° and connected by a crankshaft and connecting rod. The main cylinder has a first inclined step, and the main piston has a second inclined step. Air enters the first-stage compression chamber through a first-stage intake valve located at the end of the main cylinder. As the main piston moves from bottom dead center to top dead center, the main piston, main cylinder, and first-stage compression chamber continuously decrease in size. As the first-stage intake valve closes, the first-stage booster valve opens, and the compressed gas passes through the main cylinder... The primary compressed air is discharged through the first-stage booster valve at the end of the cylinder. After being discharged, the primary compressed air enters the secondary compression space on the main cylinder through pipe A and the secondary intake valve set on the main cylinder pipe wall. As the main piston moves from top dead center to bottom dead center, the space between the first and second inclined steps gradually decreases, forming a secondary compression chamber. The secondary compression chamber continuously decreases and is discharged through the secondary booster valve set on the main cylinder pipe wall. After passing through pipe B and the tertiary intake valve set on the tertiary cylinder, it enters the tertiary compression chamber. During the reciprocating motion of the tertiary piston, the air is compressed and output after passing through the tertiary booster valve set on the tertiary cylinder.

[0005] Furthermore, the angles of the first and second angled steps are specifically 30°. Furthermore, an expansion ring is provided between the main piston and the main cylinder to seal the second compression chamber.

[0006] Furthermore, the main piston is provided with a groove, and the expansion ring cooperates with the groove during the movement of the main piston to achieve a seal.

[0007] Furthermore, the sealing is achieved by the overlap of the sidewalls on both sides of the expansion ring with the sidewalls of the groove.

[0008] Furthermore, the crankshaft connecting rod includes a secondary connecting rod, an eccentric wheel, and a main connecting rod. The secondary connecting rod and the main connecting rod are respectively mounted on the eccentric wheel. As the eccentric wheel rotates, it drives the secondary connecting rod and the main connecting rod to move, thereby driving the reciprocating motion of the main cylinder and the third-stage cylinder respectively, realizing the conversion from circular motion to reciprocating motion.

[0009] Furthermore, the first-stage compression cavity is a cylindrical cavity formed between the top of the main piston and the end of the main cylinder; the second-stage compression cavity is an annular cavity formed between the top of the main piston and the wall of the main cylinder; and the third-stage compression cavity is an annular cavity formed between the third-stage piston and the inner wall of the third-stage cylinder.

[0010] Furthermore, it also includes a first-stage compression formed by the first-stage intake valve and the first-stage boost valve at the end of the first-stage compression cylinder and the blind cover on the end face of the main cylinder; a second-stage compression formed by the second-stage intake valve and the second-stage boost valve and the second-stage boost chamber; and automatic adaptation of the intake and exhaust processes of the first-stage compression and the second-stage compression.

[0011] Furthermore, it also includes a three-stage cylinder and a three-stage piston. The three-stage cylinder is set 90° away from the main cylinder to ensure the adaptability of the intake and exhaust processes of the two-stage compression and the three-stage compression.

[0012] Furthermore, the first-stage intake valve and the first-stage boost valve for the first-stage compression and boost are located in the blind cover area of ​​the main cylinder head; the second-stage intake valve and the second-stage boost valve are located on the side of the main cylinder; and the third-stage intake valve and the third-stage boost valve are located on the side of the third-stage cylinder.

[0013] Furthermore, the main cylinder and the third-stage cylinder are connected and fixed to the crankshaft housing. The crankshaft housing is equipped with a crankshaft and connecting rod mechanism, including a secondary connecting rod and a main connecting rod. The main connecting rod is connected to the main piston by a pin and is responsible for the first and second stage compression. The secondary connecting rod is connected to the third-stage piston by a pin and is responsible for the third stage compression.

[0014] Furthermore, the compressor inlet is connected to the first-stage intake valve via a rotary joint, the first-stage booster valve is connected to the second-stage intake valve via a section of pipe A, the second-stage booster valve is connected to the third-stage intake valve via a section of curved pipe B, and the third-stage booster valve is connected to the exhaust outlet.

[0015] Furthermore, annular ribs are provided on the outside of the three-stage cylinder and the main cylinder of the air compressor.

[0016] Technical effect 1. This invention provides a mobile high-pressure filling air compressor, which can provide air cylinder filling technology for aircraft aerodynamic control systems, and can also be applied to mechanical high-pressure air drive systems, providing aerodynamic power technology solutions for their drive systems.

[0017] 2. In this invention, primary compression and secondary compression are respectively set in the movable space between the piston head and the piston outer wall and the cylinder inner wall. The piston and cylinder have two working diameters. During the periodic reciprocating motion of the piston, a periodic changing space is formed between the piston end and the piston and the cylinder wall, thus realizing two-stage compression in one piston and cylinder.

[0018] 3. This design enables simultaneous primary compression and exhaust with secondary intake, and simultaneous primary intake and secondary exhaust, featuring automatic adaptation between primary and secondary compression without requiring a dedicated coordination design.

[0019] 4. The air compressor of the present invention has a three-stage piston cylinder arranged in a V-shape with the first and second stage piston cylinders at a 90° angle. During the movement of the crankshaft driving the connecting rod, the intake process of the three-stage cylinder corresponds to the exhaust process of the second stage compression, thus realizing the synergy between the second and third stage compression.

[0020] 5. This invention is designed with 5 intake and exhaust valves, which can realize flow and pressure control between each stage of intake and exhaust. Attached Figure Description

[0021] Figure 1 This is a structural layout diagram of an air compressor; Figure 2 Diagram of the bottom dead center of the main compression cylinder; Figure 3 Top dead center diagram of the main compression cylinder; Figure 4 Diagram of the top dead center of the auxiliary compression cylinder; Figure 5 Diagram of the bottom dead center of the auxiliary compression cylinder; Among them, 1-first stage booster valve, 2-first stage intake valve, 3-rotary inlet joint, 4-main compression cylinder, 5-second stage booster valve, 6-connecting air pipe 2, 7-third stage intake valve, 8-auxiliary compression cylinder, 9-third stage booster valve, 10-auxiliary compression piston, 11-machine casing, 12-auxiliary connecting rod, 13-eccentric wheel assembly, 14-main connecting rod, 15-main compression piston, 16-second stage intake valve, 17-connecting air pipe 1. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below. In the examples, the same or similar reference numerals denote the same or similar components or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this invention. The embodiments described below with reference to reference are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below.

[0023] Example 1 A piston-type three-stage compression ultra-high pressure air compressor includes a first-stage intake valve (2), a first-stage booster valve (1), a main cylinder (4), and a main piston (15). The first-stage intake valve (2) and the first-stage booster valve (1) are located at the end of the main cylinder (4) and are used to form a compression chamber with the main piston (15). The main piston (15) and the main connecting rod (14) are connected by a pin. The main connecting rod (14) is mounted on the crankshaft and receives the power transmitted from the input shaft to the crankshaft. The first-stage intake valve (2) is connected to a rotary joint (3) and is used to control the intake process during the first-stage compression and exhaust process.

[0024] Furthermore, the first-stage intake valve (2) and the first-stage booster valve (1) also include components such as springs and valve seats, which are independent components.

[0025] Furthermore, the expansion ring at the head of the main piston (15) is lubricated with oil during the reciprocating motion.

[0026] Furthermore, it also includes a secondary intake valve (16) and a secondary booster valve (5). The secondary intake valve (16) is connected to the primary booster valve (1) through pipe A (17) to receive the primary compressed air. The secondary compression and exhaust processes are controlled by the secondary intake valve (16) and the secondary booster valve (5).

[0027] Furthermore, the secondary intake valve (16) and the secondary booster valve (5) also include components such as springs and valve seats, which are independent components.

[0028] Furthermore, the first-stage and second-stage supercharging share a set of main cylinder (4) and main piston (15), and the heat dissipation fins on the outside of the main cylinder (4) dissipate the compression heat generated during the first-stage and second-stage compression processes.

[0029] Furthermore, the three-stage compression is achieved through a three-stage cylinder (8) and a three-stage piston (10). The outer diameters of the two ends of the three-stage piston (10) are different, which are used to cooperate with the three-stage cylinder (8) to form an annular compression chamber. Several sealing rings are provided at both ends of the three-stage piston (10) for sealing the three-stage compression chamber and lubrication.

[0030] Furthermore, the third-stage piston (10) is connected to the auxiliary connecting rod (12) and reciprocates under the drive of the crankshaft. During the reciprocating motion, the expansion ring bears the main wear between itself and the third-stage cylinder (8), and at the same time, the back-and-forth motion of the expansion ring can achieve the function of lubricating oil.

[0031] Furthermore, it also includes a third-stage intake valve (7) and a third-stage booster valve (9). The third-stage intake valve (7) is connected to the second-stage booster valve (5) through a section of pipe B (6) to receive compressed gas from the second-stage booster. The third-stage booster valve (9) is connected to the outlet through a section of pipe.

[0032] Furthermore, the external surface of the three-stage cylinder (8) is provided with dense fins for heat dissipation during the three-stage compression process.

[0033] Furthermore, the ribs on the outside of the main cylinder (4) and the ribs on the outside of the third-stage cylinder (8) can be cooled by forced convection through external fans to ensure that the product does not overheat during operation.

[0034] Furthermore, the crankshaft and connecting rod mechanism inside the casing are in a state of lubricating oil immersion. During operation, the crankshaft, main connecting rod (14) and auxiliary connecting rod (12) splash lubricating oil to lubricate the main piston (15) and the third-stage piston (10).

[0035] The process of piston pumping lubricating oil and lubrication is as follows: The lubricating oil in the cylinder casing is splashed during the movement of the crankshaft and connecting rod, and this splashed oil travels to the vicinity of the piston and cylinder walls. Multiple expansion rings are installed in multiple piston grooves, with certain gaps between the expansion rings and the piston grooves, as well as at the bottom of the grooves. The expansion rings have notches, serving as lubricating oil passages. When the piston moves to bottom dead center, due to friction and inertia between the expansion rings and the cylinder wall, the expansion rings adhere tightly to the upper wall of the piston groove, and lubricating oil fills the gaps below the expansion rings. When the piston moves to top dead center, the expansion rings, again under the influence of friction and inertia, adhere tightly to the lower wall of the piston groove, and the lubricating oil previously in the gaps below the expansion rings is pumped to the upper wall. This cycle repeats, thus lubricating the piston and cylinder walls.

[0036] Example 2 A piston-type three-stage compression ultra-high pressure air compressor includes a three-stage piston compression structure formed by a main piston (15), a main cylinder (4), a third-stage cylinder (8), and a third-stage piston (10). The main cylinder (4) and the third-stage cylinder (8) are arranged at 90° and connected by a crankshaft connecting rod. The main cylinder (4) is provided with a first inclined step, and the main piston (15) is provided with a second inclined step. Air enters the primary compression chamber through the primary intake valve (2) located at the end of the main cylinder (4) via the rotary joint (3) of the air compressor. As the main piston (15) moves from the bottom dead center to the top dead center, the main piston (15), the main cylinder (4), and the primary compression chamber continuously decrease in size. As the primary intake valve (2) closes, the primary booster valve (1) opens. After compression, the gas is discharged through the primary booster valve (1) located at the end of the main cylinder (4). The discharged primary compressed air enters through pipe A (17) and the secondary intake valve (16) located on the pipe wall of the main cylinder (4). The air enters the secondary compression space on the main cylinder (4). As the main piston (15) moves from the top dead center to the bottom dead center, the space between the first and second inclined steps gradually decreases, forming a secondary compression chamber. The secondary compression chamber continuously decreases and is discharged through the secondary booster valve (5) set on the pipe wall of the main cylinder (4). After passing through pipe B (6) and the tertiary intake valve (7) set on the tertiary cylinder (8), the air enters the tertiary compression chamber. During the reciprocating motion of the tertiary piston (10), the air is compressed and output after passing through the tertiary booster valve (9) set on the tertiary cylinder (8).

[0037] The angles of the first and second angled steps are specifically 30°. In one embodiment of the present invention, expansion rings are provided between the main piston (15) and the main cylinder (4) to seal the second compression chamber.

[0038] In one embodiment of the present invention, the main piston (15) is provided with a groove. During the movement of the main piston (15), the expansion ring cooperates with the groove to achieve a seal. As the piston reciprocates continuously, the expansion ring also moves along with it. During the reciprocating motion, the piston sometimes adheres to the lower wall of the piston groove and sometimes adheres to the upper wall of the piston groove, forming a pump-like action that continuously pumps lubricating oil to the cylinder, creating a lubrication effect and reducing wear during the operation of the compressor.

[0039] In one embodiment of the present invention, the sealing is achieved by overlapping the sidewalls on both sides of the expansion ring with the sidewalls of the groove.

[0040] In one embodiment of the present invention, the gap is used to contain lubricating oil to avoid damage caused by dry friction of the main piston (15).

[0041] The crankshaft connecting rod includes a secondary connecting rod (12), an eccentric wheel (13), and a main connecting rod (14). The secondary connecting rod (12) and the main connecting rod (14) are respectively mounted on the eccentric wheel (13). As the eccentric wheel (13) rotates, it drives the secondary connecting rod (12) and the main connecting rod (14) to move, thereby driving the main cylinder (4) and the third-stage cylinder (8) to reciprocate, realizing the conversion from circular motion to reciprocating motion.

[0042] In one embodiment of the present invention, the first-stage compression cavity is a cylindrical cavity formed between the top of the main piston (15) and the end of the main cylinder (4); the second-stage compression is an annular cavity formed between the top of the main piston (15) and the wall of the main cylinder (4); and the third-stage compression is an annular cavity formed between the third-stage piston (10) and the inner wall of the third-stage cylinder (8).

[0043] In one embodiment of the present invention, a first-stage intake valve (2) and a first-stage booster valve (1) at the end of the first-stage compression cylinder form a first-stage compression with a blind cover on the end face of the main cylinder (4); a second-stage intake valve (16) and a second-stage booster valve (5) form a second-stage compression with the second-stage booster chamber; the intake and exhaust processes of the first-stage compression and the second-stage compression are automatically adapted, and the invention has automatic adaptability.

[0044] In one embodiment of the present invention, a third-stage cylinder (8) and a third-stage piston (10) are also included. The third-stage cylinder (8) is set at a 90° angle to the main cylinder (4) to ensure the adaptability of the intake and exhaust processes of the second-stage compression and the third-stage compression.

[0045] In one embodiment of the present invention, the first-stage intake valve (2) and the first-stage boost valve (1) of the first-stage compression boost are located in the blind cover area of ​​the head of the main cylinder (4); the second-stage intake valve (16) and the second-stage boost valve (5) are located on the side of the main cylinder (4); and the third-stage intake valve (7) and the third-stage boost valve (9) are located on the side of the third-stage cylinder (8).

[0046] In one embodiment of the present invention, the main cylinder (4) and the third-stage cylinder (8) are connected and fixed to the crankshaft housing. A crankshaft and connecting rod mechanism is provided in the crankshaft housing, including a secondary connecting rod (12) and a main connecting rod (14). The main connecting rod (14) is connected to the main piston (15) by a pin and is responsible for the first and second stage compression. The secondary connecting rod (12) is connected to the third-stage piston (10) by a pin and is responsible for the third stage compression.

[0047] In one embodiment of the present invention, the compressor inlet is connected to the first-stage intake valve (2) via a rotary joint (3), the first-stage booster valve (1) is connected to the second-stage intake valve (16) via a section of pipe A (17), the second-stage booster valve (5) is connected to the third-stage intake valve (7) via a section of curved pipe B (6), and the third-stage booster valve (9) is connected to the exhaust outlet.

[0048] In one embodiment of the present invention, annular ribs are provided on the outside of the main cylinder (4) of the air compressor, which can greatly increase the outer surface area of ​​the main cylinder (4) and effectively dissipate heat from the compressor; annular ribs are also provided on the outside of the third-stage cylinder (8), which greatly increases the outer surface area of ​​the third-stage cylinder (8) and effectively dissipates heat from the compressor.

[0049] In one embodiment of the present invention, annular expansion rings are provided at both ends of the main piston (15) to seal the sealing cavities of the first-stage compression and the second-stage compression. Another function of the expansion rings is to provide better lubrication during the reciprocating motion of the main piston (15) in the main cylinder (4). Annular expansion rings are provided at both ends of the third-stage piston (10) to seal the sealing cavities of the third-stage compression. Another function of the expansion rings is to provide better lubrication during the reciprocating motion of the third-stage piston (10) in the third-stage cylinder (8). In one embodiment of the present invention, the expansion ring is made of wear-resistant material, which can effectively prevent wear between the main piston (15) and the main cylinder (4), and prevent wear between the third-stage piston (10) and the third-stage cylinder (8).

[0050] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0051] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0052] The above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Within the spirit and principles of the present invention, any person skilled in the art may use the above-disclosed technical content to make changes or modifications to equivalent embodiments and apply them to other fields. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention, as well as any modifications, equivalent substitutions, improvements, etc., should be included within the protection scope of the present invention.

Claims

1. A piston-type three-stage compression ultra-high pressure air compressor, characterized in that, It includes a three-stage piston compression structure consisting of a main piston, a main cylinder, a third-stage cylinder, and a third-stage piston. The main cylinder and the third-stage cylinder are arranged at 90° and connected by a crankshaft and connecting rod. The main cylinder has a first inclined step, and the main piston has a second inclined step. Air from the rotary joint of the air compressor enters the first-stage compression chamber through a first-stage intake valve located at the end of the main cylinder. As the main piston moves from bottom dead center to top dead center, the main piston, main cylinder, and first-stage compression chamber continuously shrink. As the first-stage intake valve closes, the first-stage booster valve opens, and the compressed gas is discharged through the first-stage booster valve located at the end of the main cylinder. The discharged primary compressed air enters the second-stage compression space on the main cylinder through pipe A and a second-stage intake valve located on the main cylinder wall. As the main piston moves from top dead center to bottom dead center, the space between the first and second inclined steps gradually decreases, forming a second-stage compression chamber. The second-stage compression chamber continuously shrinks and is discharged through the second-stage booster valve located on the main cylinder wall. After passing through pipe B and the third-stage intake valve located on the third-stage cylinder, it enters the third-stage compression chamber. During the reciprocating motion of the third-stage piston, the air is compressed and output through the third-stage booster valve located on the third-stage cylinder.

2. The compressor as described in claim 1, characterized in that, The first and second inclined steps have an angle of 30°. An expansion ring is provided between the main piston and the main cylinder to seal the second compression chamber. The main piston has a groove, and the expansion ring cooperates with the groove during the movement of the main piston to achieve a seal. The seal is achieved by the side walls on both sides of the expansion ring overlapping with the side walls of the groove.

3. The compressor as described in claim 2, characterized in that, The crankshaft connecting rod includes a secondary connecting rod, an eccentric wheel, and a main connecting rod. The secondary connecting rod and the main connecting rod are respectively mounted on the eccentric wheel. As the eccentric wheel rotates, it drives the secondary connecting rod and the main connecting rod to move, thereby driving the reciprocating motion of the main cylinder and the third-stage cylinder respectively, realizing the conversion from circular motion to reciprocating motion.

4. The compressor as described in claim 3, characterized in that, The first-stage compression cavity is a cylindrical cavity formed by the top of the main piston and the end of the main cylinder; the second-stage compression cavity is an annular cavity formed between the top of the main piston and the wall of the main cylinder; and the third-stage compression cavity is an annular cavity formed between the third-stage piston and the inner wall of the third-stage cylinder.

5. The compressor as described in claim 4, characterized in that, It also includes a first-stage intake valve and a first-stage booster valve at the end of the first-stage compression cylinder forming a first-stage compression with a blind cover on the end face of the main cylinder; a second-stage intake valve and a second-stage booster valve forming a second-stage compression with the second-stage booster chamber; and automatic adaptation of the intake and exhaust processes of the first-stage and second-stage compression.

6. The compressor as described in claim 5, characterized in that, It also includes a three-stage cylinder and a three-stage piston. The three-stage cylinder is set 90° away from the main cylinder to ensure the adaptability of the intake and exhaust processes of the two-stage and three-stage compression.

7. The compressor as described in claim 6, characterized in that, The first-stage intake valve and the first-stage boost valve for the first-stage compression boost are located in the blind cover area of ​​the main cylinder head; the second-stage intake valve and the second-stage boost valve are located on the side of the main cylinder; and the third-stage intake valve and the third-stage boost valve are located on the side of the third-stage cylinder.

8. The compressor as claimed in claim 7, characterized in that, The main cylinder and the third-stage cylinder are connected and fixed to the crankshaft housing. The crankshaft housing contains a crankshaft and connecting rod mechanism, including a secondary connecting rod and a main connecting rod. The main connecting rod is connected to the main piston by a pin and is responsible for the first and second stage compression. The secondary connecting rod is connected to the third-stage piston by a pin and is responsible for the third stage compression.

9. The compressor as claimed in claim 8, characterized in that, The compressor inlet is connected to the first-stage intake valve via a rotary joint. The first-stage booster valve is connected to the second-stage intake valve via a section of pipe A. The second-stage booster valve is connected to the third-stage intake valve via a section of curved pipe B. The third-stage booster valve is connected to the exhaust outlet.

10. The compressor as claimed in claim 1, characterized in that, Both the three-stage cylinder and the main cylinder of the air compressor are equipped with annular ribs on the outside.

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