Oil-free compressor transmission device and compressor

Abstract

The embodiment of the invention provides an oil-free compressor transmission device and a compressor, and relates to the field of compressors. Comprising a driving cavity, a compression cylinder, a piston, a connecting rod, a turntable, a connecting shaft, a driving groove and a sliding rod, the number of the compression cylinders is three, the compression cylinders are installed on the driving cavity in the circumferential direction at equal intervals, and the compression cylinders communicate with the driving cavity. The number of the rotary tables is two, and the rotary tables are rotationally installed in the driving cavity and are coaxial with the driving cavity. The central positions of the two rotating discs are connected through a connecting shaft; the opposite sides of the two rotating discs are provided with symmetrical driving grooves correspondingly. The number of the sliding rods is three, the two ends of the three sliding rods are slidably installed in the two driving grooves correspondingly, and the three sliding rods are arranged at equal intervals in the circumferential direction. The three connecting rods are arranged in the circumferential direction at equal intervals, and one ends of the three connecting rods are rotationally connected with the middle of the sliding rod. Continuous multi-cavity air compression can be achieved, adaptive operation is rapidly carried out, and switching according to actual conditions is facilitated.

Description

Technical Field

[0001] This invention relates to the field of compressor equipment, specifically to an oil-free compressor drive device and compressor. Background Technology

[0002] An oil-free compressor refers to a compressor that does not require lubricating oil in its cylinders. The crankcase of a fully oil-free compressor is a dry structure. Compressed air, as a core power source in industry, is essential for industries such as medical, electronics, and food due to its ability to provide Class 0 oil-free air (oil content ≤0.01mg / m³), with market demand growing at over 30%. Driven by "dual carbon" (carbon dioxide, carbon emissions, and carbon emissions) and Industry 4.0, the industry is upgrading towards energy conservation and intelligentization, with permanent magnet variable frequency and contactless transmission technologies rapidly penetrating the market.

[0003] Currently, most mainstream oil-free compressors adopt a transmission architecture of motor-single transmission mechanism-single compression cylinder, which has the disadvantages of long power transmission path and low utilization rate. Moreover, the working mode of single compression cylinder limits the continuity and adjustability of gas compression, making it difficult to match the variable flow requirements under multiple working conditions. This not only reduces the stability of equipment operation but also increases maintenance costs, failing to meet the needs of high-end manufacturing fields for high-efficiency, low-noise, and long-life compressors.

[0004] Based on this, the present invention is proposed. Summary of the Invention

[0005] According to embodiments of the present invention, an oil-free compressor drive and compressor are provided to address the problems existing in the prior art.

[0006] In a first aspect of the invention, an oil-free compressor drive device is provided.

[0007] The oil-free compressor transmission device and compressor include: a drive chamber, a compression cylinder, a piston, a connecting rod, a turntable, a connecting shaft, a drive groove, and a slide rod; There are three compression cylinders, which are equidistantly mounted on the drive cavity along the circumference and are connected to the drive cavity; there are two turntables, which are rotatably mounted in the drive cavity and are coaxially arranged with the drive cavity; the center positions of the two turntables are connected by a connecting shaft; the two turntables are respectively provided with mutually symmetrical drive grooves on opposite sides; there are three slide rods, the two ends of which are slidably mounted in the two drive grooves and are equidistantly arranged along the circumference; there are three connecting rods, which are equidistantly arranged along the circumference, one end of which is rotatably connected to the middle of the slide rod, and the other end of which extends into the three compression cylinders; the piston is mounted on the end of the connecting rod that extends into the compression cylinder.

[0008] Preferably, it also includes: a limiting seat; There are three limiting seats, which are equidistantly arranged in the three compression cylinders along the circumference, and the connecting rod slides through the limiting seats.

[0009] Preferably, the drive groove includes: a distal groove, a proximal groove, and a connecting groove; There are three distal slots and three proximal slots, which are arranged equidistantly along the circumference; adjacent distal slots and proximal slots are connected by connecting slots; the distance of the proximal slot from the center of the turntable is less than the distance of the distal slot from the center of the turntable.

[0010] In a second aspect of the invention, an oil-free compressor is provided.

[0011] The oil-free compressor includes an oil-free compressor drive unit, and also includes: an inlet pipe, a filter, an outlet pipe, a mounting plate, a connecting pipe, and an air valve; There are three air inlet pipes and three air outlet pipes, which are respectively installed on the side of each compression cylinder away from the drive chamber; a filter is installed at the free end of the air inlet pipe; the fixing plate is installed in the compression cylinder, and the air inlet pipes and air outlet pipes are connected to the fixing plate through connecting pipes; an air valve is installed at the end of the air inlet pipes and air outlet pipes connected to the fixing plate.

[0012] Preferably, it also includes: a housing, a base, a connecting box, an air pump, and a motor; The outer casing is installed on the outside of the drive cavity; the base is installed on the bottom of the outer casing; the connecting box is installed on the outer casing, and each of the air outlet pipes is connected to the connecting box through a pipe; the air pump is installed on the connecting box, and its suction end is connected to the inner cavity of the connecting box; the motor is installed inside the outer casing, and its output end is connected to the turntable.

[0013] Preferably, the air valve includes: a valve wall, a valve seat, a first through hole, a blind hole, a first spring, a valve plate, a second through hole, a connecting post, a limiting plate, a third through hole, and a limiting bolt; The valve seat is fixedly installed inside the valve wall; the first through hole is opened on the valve seat; the blind hole is opened on the valve seat; one end of the first spring is fixedly installed in the blind hole; the valve plate is installed on the other end of the first spring; the second through hole is opened on the valve plate, and the second through hole corresponds to the position of the first through hole; one end of the connecting post is installed at the center position of the valve seat, and the connecting post passes through the center position of the valve plate; the limiting plate is fixedly installed at the other end of the connecting post; the limiting bolt is screwed to the free end of the connecting post; the third through hole is opened on the limiting plate, and is offset from the second through hole.

[0014] Preferably, the motor is connected to the turntable via a transmission mechanism, which is installed inside the housing.

[0015] Preferably, the transmission mechanism includes: a first gear, a second gear, a rotating arm, an electric push rod, a fixed disc, a gear ring, a locking block, a fixed block, a second spring, a locking arm, and a sliding surface; The first gear is rotatably mounted on the housing and connected to the output end of the motor; the second gear is rotatably mounted at the center of the housing and connected to the turntable; the first gear and the second gear are meshed; the rotating arm is rotatably mounted on the housing and is V-shaped; the electric push rod is rotatably mounted on the housing, and its output end is rotatably connected to the rotating arm via a pin; there are two fixed disks, which are fixedly mounted at both ends of the rotating arm; the gear ring is rotatably mounted on the two fixed disks; there are several locking blocks, which are equidistantly mounted on the inner side of the gear ring along the circumference; the fixed block is fixedly mounted at the center of the fixed disk and located inside the gear ring; one end of the second spring is fixedly mounted on the inner wall of the fixed block; one end of the locking arm is fixedly mounted on the other end of the second spring, and the other end of the locking arm extends out of the fixed block.

[0016] Preferably, the locking block is triangular in shape, with the two sides of the portion protruding towards the center of the toothed ring being a first inclined side and a second inclined side. The first inclined side coincides with one diameter of the toothed ring, and the second inclined side is inclined relative to the diameter of the toothed ring. The locking arm is wedge-shaped and faces one end of the locking block, with the inclined surface forming a sliding surface, and the direction of the sliding surface corresponds to the first inclined side.

[0017] Preferably, the diameter of the first gear is smaller than the diameter of the second gear.

[0018] One or more technical solutions provided in this application have at least the following technical effects or advantages: 1. The present invention provides an oil-free compressor transmission device, which enables multiple pistons to reciprocate along the axial direction of the compression cylinder by driving the slide rod through the drive groove on the turntable, thereby compressing the gas. The transmission device does not require the participation of hydraulic oil and can complete the compression work through mechanical motion. With the operation of the air valve, it can realize multi-chamber compressed air synchronously and continuously.

[0019] 2. The oil-free compressor provided in this invention is driven by a motor and uses a gas pump to achieve directional transfer of compressed gas.

[0020] 3. The transmission mechanism in this invention can lock the rotation direction of the turntable to prevent reverse rotation and can quickly switch the restricted direction. When driven by a bidirectional motor, it can quickly adapt to the operation, which helps to switch according to the actual situation.

[0021] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0022] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A schematic diagram of the structure of an oil-free compressor drive device according to an embodiment of the present invention is shown; Figure 2 An exploded view of the oil-free compressor drive device according to an embodiment of the present invention is shown. Figure 3 A front sectional view of an oil-free compressor drive device according to an embodiment of the present invention is shown; Figure 4 A front view of the drive slot for an oil-free compressor transmission according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of the air valve of the oilless compressor drive device according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the rear side of the valve of an oilless compressor drive device according to another embodiment of the present invention is shown; Figure 7 A rear view of the transmission mechanism of the air valve of an oilless compressor drive according to another embodiment of the present invention is shown; Figure 8 A schematic diagram of the transmission mechanism of the air valve of an oilless compressor drive device according to another embodiment of the present invention is shown; Figure 9 A plan view of the gear ring of the air valve of an oilless compressor drive according to another embodiment of the present invention is shown.

[0023] The attached figures are labeled as follows: 1. Drive chamber; 2. Compression cylinder; 3. Inlet pipe; 4. Filter; 5. Outlet pipe; 6. Fixing plate; 7. Connecting pipe; 8. Air valve; 81. Valve wall; 82. Valve seat; 83. First through hole; 84. Blind hole; 85. First spring; 86. Valve plate; 87. Second through hole; 88. Connecting post; 89. Limiting plate; 810. Third through hole; 811. Limiting bolt; 9. Piston; 10. Connecting rod; 11. Turntable; 12. Connecting shaft; 13. Drive groove; 1301. Remote 1302. Core groove; 1303. Connecting groove; 14. Slide rod; 15. Limiting seat; 16. Outer shell; 17. Base; 18. Connecting box; 19. Air pump; 20. Motor; 21. First gear; 22. Second gear; 23. Rotating arm; 24. Electric push rod; 25. Fixed plate; 26. Gear ring; 27. Locking block; 2701. First inclined side; 2702. Second inclined side; 28. Fixed block; 29. ​​Second spring; 30. Locking arm; 31. Slide surface. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Example 1

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the oil-free compressor transmission device includes: a drive chamber 1, compression cylinders 2, pistons 9, connecting rods 10, turntables 11, connecting shafts 12, drive grooves 13, slide rods 14, and limiting seats 15. There are three compression cylinders 2, equidistantly mounted on the drive chamber 1 along the circumference, and the compression cylinders 2 are connected to the drive chamber 1. There are two turntables 11, rotatably mounted in the drive chamber 1, and coaxially arranged with the drive chamber 1. The centers of the two turntables 11 are connected by the connecting shaft 12. Symmetrical drive grooves 13 are respectively opened on opposite sides of the two turntables 11. There are three slide rods 14, with both ends slidably mounted in the two drive grooves 13, and the three slide rods 14 are equidistantly arranged along the circumference. There are three connecting rods 10, equidistantly arranged along the circumference, with one end of each connecting rod 10 rotatably connected to the middle of a slide rod 14, and the other end of each connecting rod 10 extending into one of the three compression cylinders 2. Piston 9 is mounted on one end of connecting rod 10 extending into compression cylinder 2, and piston 9 is slidably mounted in compression cylinder 2. The piston 9 has a cylindrical core made of metal inside, wrapped with rubber, providing both good strength and a tight seal. Three limiting seats 15 are equidistantly arranged in the three compression cylinders 2 along the circumference, and connecting rod 10 slides through the limiting seats 15. The limiting seats 15 ensure that connecting rod 10 can move along its own axial direction, preventing offset or skew. The drive groove 13 includes: a distal groove 1301, a proximal groove 1302, and a connecting groove 1303. There are three distal grooves 1301 and three proximal grooves 1302, equidistantly staggered along the circumference. Adjacent distal grooves 1301 and proximal grooves 1302 are connected by the connecting groove 1303. The distance from the proximal groove 1302 to the center of the turntable 11 is less than the distance from the distal groove 1301 to the center of the turntable 11. The working principle of this structure is as follows: When the turntable 11 is rotated under control, it enables the drive groove 13 to move in a circular motion. When the slide rod 14 slides from the proximal groove 1302 into the distal groove 1301 via the connecting groove 1303, the piston 9 moves along the axial direction of the compression cylinder 2 away from the drive chamber 1 through the linkage of the connecting rod 10, thus compressing the air in the compression cylinder 2. Conversely, when the slide rod 14 slides into the proximal groove 1302, the piston 9 returns to its original position. During this process, the limiting seat 15 is used to stably limit the connecting rod 10.

[0028] Furthermore, embodiments of the present invention also provide a compressor, such as... Figure 1 , Figure 2 and Figure 3As shown, the device includes an oil-free compressor drive unit, and further includes: an inlet pipe 3, a filter 4, an outlet pipe 5, a fixing plate 6, a connecting pipe 7, a valve 8, a housing 16, a base 17, a connecting box 18, an air pump 19, and a motor 20. There are three inlet pipes 3 and three outlet pipes 5, each installed on the side of each compression cylinder 2 away from the drive chamber 1. A filter 4 is installed at the free end of the inlet pipe 3; in this embodiment, the filter 4 is a screen to prevent impurities in the air from entering the compression cylinder 2. The fixing plate 6 is installed in the compression cylinder 2. The inlet pipes 3 and 5 are connected to the fixing plate 6 via the connecting pipe 7, and a valve 8 is installed at the end of the inlet pipes 3 and 5 connected to the fixing plate 6. The two valves 8 are arranged in opposite directions. A compression space exists between the fixing plate 6 and the piston 9. The piston 9 moves towards the drive chamber 1, and under the control of the valves 8, gas enters the compression cylinder 2 from the inlet pipe 3. Piston 9 moves away from the drive chamber 1, compressing the air in compression cylinder 2. When the air pressure reaches a critical value, it opens the air valve 8 on the outlet pipe 5, and the compressed gas is discharged through the outlet pipe 5. The outer casing 16 is installed outside the drive chamber 1. The base 17 is installed at the bottom of the outer casing 16 to support the entire device. The connecting box 18 is installed on the outer casing 16, and each outlet pipe 5 is connected to the connecting box 18 via a pipe. The air pump 19 is installed on the connecting box 18, with its suction end connected to the inner cavity of the connecting box 18. The air outlet of the air pump 19 is connected to an external air storage tank to store the compressed gas for later use. The motor 20 is installed inside the outer casing 16, and its output end is connected to the turntable 11.

[0029] refer to Figure 5The air valve 8 includes: a valve wall 81, a valve seat 82, a first through hole 83, a blind hole 84, a first spring 85, a valve plate 86, a second through hole 87, a connecting post 88, a limiting plate 89, a third through hole 810, and a limiting bolt 811. The valve seat 82 is fixedly installed inside the valve wall 81. The first through hole 83 is formed on the valve seat 82. The blind hole 84 is formed on the valve seat 82. One end of the first spring 85 is fixedly installed in the blind hole 84. The valve plate 86 is installed on the other end of the first spring 85 and is annular in shape. The second through hole 87 is formed on the valve plate 86, and its position corresponds to that of the first through hole 83. One end of the connecting post 88 is installed at the center of the valve seat 82, and the connecting post 88 passes through the center of the valve plate 86. A limiting plate 89 is fixedly installed at the other end of the connecting post 88. The limiting plate 89 is used to limit the movement distance of the valve plate 86. A limiting bolt 811 is screwed onto the free end of the connecting post 88 to fix the limiting plate 89. A third through hole 810 is opened on the limiting plate 89 and is offset from the second through hole 87 to ensure that the airflow channel can be closed when the valve plate 86 is in contact with the limiting plate 89. In actual use, the limiting plate 89 in the air valve 8 connected to the air inlet pipe 3 faces away from the drive chamber 1, and the limiting plate 89 in the air valve 8 connected to the air outlet pipe 5 faces the drive chamber 1. Under normal conditions, the elastic force of the first spring 85 is used to make the valve plate 86 and the limiting plate 89 fit together. When piston 9 moves to one side of drive chamber 1, it creates a negative pressure space in compression cylinder 2. This negative pressure suction opens valve plate 86 on intake pipe 3, simultaneously compressing the corresponding first spring 85. This ensures airflow sequentially passes through the third through hole 810, second through hole 87, and first through hole 83 into compression cylinder 2. Simultaneously, valve plate 86 on outlet pipe 5 tightly adheres to limiting plate 89 to prevent leakage. When piston 9 moves in the opposite direction, the tension of the first spring 85 causes valve plate 86 on intake pipe 3 to re-adhere to limiting plate 89 using the elastic force of the first spring 85 and the combined effect of air pressure. At the same time, the gas is compressed in compression cylinder 2. When the air pressure exceeds the critical value of the elastic force of the first spring 85 on outlet pipe 5, valve plate 86 is pushed open, ensuring the output of compressed gas.

[0030] Example 2

[0031] The difference between this embodiment and Embodiment 1 is that the motor 20 is connected to the turntable 11 via a transmission mechanism. (See reference...) Figure 6 , Figure 7 , Figure 8 and Figure 9The transmission mechanism includes: a first gear 21, a second gear 22, a rotating arm 23, an electric push rod 24, a fixed disk 25, a gear ring 26, a locking block 27, a fixed block 28, a second spring 29, a locking arm 30, and a sliding surface 31. A partition is installed inside the housing 16, and the transmission mechanism is installed in the cavity between the partition and the housing 16. A motor 20 is mounted on this partition. The first gear 21 is rotatably mounted on the housing 16 and connected to the output end of the motor 20. The second gear 22 is rotatably mounted at the center of the housing 16 and is connected to the turntable 11, ensuring that the two can rotate synchronously. The first gear 21 and the second gear 22 are meshed, and the diameter of the first gear 21 is smaller than the diameter of the second gear 22, ensuring that the first gear 21 and the second gear 22 can rotate synchronously and that the rotational speed can be reduced and the torque increased during power transmission, ensuring stable system operation. The rotating arm 23 is rotatably mounted on the housing 16. An electric actuator 24 is rotatably mounted on the housing 16. The output end of the electric actuator 24 is rotatably connected to the rotating arm 23 via a pin. This electric actuator 24 is an existing device and is a self-locking type, allowing the output end to be locked in any position. The rotating arm 23 is V-shaped, with its rotatable connection to the housing 16 located at its center. There are two fixed plates 25, fixedly mounted at both ends of the rotating arm 23. There are two toothed rings 26, rotatably mounted on the two fixed plates 25. Several locking blocks 27 are equidistantly mounted circumferentially on the inner side of the toothed rings 26. A fixed block 28 is fixedly mounted at the center of the fixed plate 25, located inside the toothed ring 26. One end of the second spring 29 is fixedly mounted on the inner wall of the fixed block 28. One end of the locking arm 30 is fixedly mounted on the other end of the second spring 29, and the other end of the locking arm 30 extends out of the fixed block 28. The locking block 27 is triangular in shape, with two sides protruding towards the center of the gear ring 26 forming a first inclined side 2701 and a second inclined side 2702. The first inclined side 2701 coincides with one diameter of the gear ring 26, while the second inclined side 2702 is inclined relative to the diameter of the gear ring 26. The locking arm 30 is wedge-shaped, facing one end of the locking block 27, with its inclined surface forming a sliding surface 31, the direction of which corresponds to the first inclined side 2701. In this embodiment, at most one gear ring 26 meshes with the second gear 22. In actual use, the motor 20 is turned on, driving the first gear 21 to rotate, thereby causing the second gear 22 to drive the turntable 11 to rotate. At this time, one of the gear rings 26 meshes with the second gear 22, so that... Figure 9For example, when the second gear 22 rotates counterclockwise, and the second inclined edge 2702 engages with the sliding surface 31, the locking arm 30 retracts into the fixed block 28 and compresses the second spring 29. When the motor 20 stops rotating, the first gear 21, the second gear 22, and the meshing gear ring 26 stop rotating. If either the second gear 22 or the first gear 21 shows a tendency to reverse, the gear ring 26 will rotate clockwise. The locking arm 30 extends under the elastic force of the second spring 29 and abuts against the adjacent first inclined edge 2701, preventing the gear ring 26 from reversing and thus locking the system. When it is necessary to switch the locking direction, after the motor 20 is turned off, the electric push rod 24 is activated to rotate the rotating arm 23, thereby disengaging the gear ring 26 from the second gear 22 while the other gear ring 26 meshes with the second gear 22. It is worth noting that in this embodiment, the toothed ring 26 and the fixed disk 25 are connected by a damping bearing, which requires the application of a certain external force to allow relative rotation, preventing the toothed ring 26 from rotating in the disengaged state and ensuring stability during engagement and disengagement. In addition, the locking blocks 27 in the two toothed rings 26 are symmetrical to each other, thereby ensuring that the locking direction can be changed by switching the engagement of the toothed ring 26.

[0032] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An oil-free compressor transmission device, characterized in that, include: Drive chamber (1), compression cylinder (2), piston (9), connecting rod (10), turntable (11), connecting shaft (12), drive groove (13) and slide rod (14). There are three compression cylinders (2), which are equidistantly installed on the drive cavity (1) along the circumference, and the compression cylinders (2) are connected to the drive cavity (1); there are two turntables (11), which are rotatably installed in the drive cavity (1) and are coaxially arranged with the drive cavity (1); the center positions of the two turntables (11) are connected by a connecting shaft (12); the two turntables (11) are respectively provided with mutually symmetrical drive grooves (13) on opposite sides; there are three slide rods (14), the two ends of the three slide rods (14) are slidably installed in the two drive grooves (13), and the three slide rods (14) are equidistantly arranged along the circumference; there are three connecting rods (10), which are equidistantly arranged along the circumference, one end of the three connecting rods (10) is rotatably connected to the middle of the slide rods (14), and the other end of the three connecting rods (10) extends into the three compression cylinders (2); the piston (9) is installed at the end of the connecting rod (10) that extends into the compression cylinder (2).

2. The oil-free compressor transmission device according to claim 1, characterized in that, Also includes: Limiting seat (15); There are three limiting seats (15), which are equidistantly arranged in the three compression cylinders (2) along the circumference, and the connecting rod (10) slides through the limiting seats (15).

3. The oil-free compressor transmission device according to claim 2, characterized in that, The drive groove (13) includes: a distal groove (1301), a proximal groove (1302), and a connecting groove (1303); There are three distal grooves (1301) and three proximal grooves (1302), which are arranged equidistantly along the circumference; adjacent distal grooves (1301) and proximal grooves (1302) are connected by connecting grooves (1303); the distance of the proximal groove (1302) from the center of the turntable (11) is less than the distance of the distal groove (1301) from the center of the turntable (11).

4. An oil-free compressor, comprising the oil-free compressor drive device as described in claim 3, characterized in that, Also includes: Air inlet pipe (3), filter (4), air outlet pipe (5), fixing plate (6), connecting pipe (7) and air valve (8); There are three air inlet pipes (3) and three air outlet pipes (5), which are respectively installed on the side of each compression cylinder (2) away from the drive chamber (1); a filter (4) is installed at the free end of the air inlet pipe (3); the fixing plate (6) is installed in the compression cylinder (2), and the air inlet pipe (3) and the air outlet pipe (5) are connected to the fixing plate (6) through the connecting pipe (7); an air valve (8) is installed at the end of the air inlet pipe (3) and the air outlet pipe (5) connected to the fixing plate (6).

5. The oil-free compressor according to claim 4, characterized in that, Also includes: The outer casing (16), base (17), connecting box (18), air pump (19) and motor (20); The outer shell (16) is installed on the outside of the drive cavity (1); the base (17) is installed on the bottom of the outer shell (16); the connecting box (18) is installed on the outer shell (16), and each of the air outlet pipes (5) is connected to the connecting box (18) through a pipe; the air pump (19) is installed on the connecting box (18), and its suction end is connected to the inner cavity of the connecting box (18); the motor (20) is installed inside the outer shell (16), and its output end is connected to the turntable (11).

6. The oil-free compressor according to claim 5, characterized in that, The air valve (8) includes: valve wall (81), valve seat (82), first through hole (83), blind hole (84), first spring (85), valve plate (86), second through hole (87), connecting post (88), limiting plate (89), third through hole (810) and limiting bolt (811). The valve seat (82) is fixedly installed inside the valve wall (81); the first through hole (83) is opened on the valve seat (82); the blind hole (84) is opened on the valve seat (82); one end of the first spring (85) is fixedly installed in the blind hole (84); the valve plate (86) is installed on the other end of the first spring (85); the second through hole (87) is opened on the valve plate (86), and the second through hole (87) corresponds to the position of the first through hole (83); one end of the connecting post (88) is installed at the center position of the valve seat (82), and the connecting post (88) passes through the center position of the valve plate (86); the limiting piece (89) is fixedly installed at the other end of the connecting post (88); the limiting bolt (811) is screwed to the free end of the connecting post (88); the third through hole (810) is opened on the limiting piece (89), and is offset from the second through hole (87).

7. The oil-free compressor according to claim 5 or 6, characterized in that, The motor (20) is connected to the turntable (11) through a transmission mechanism, which is installed inside the housing (16).

8. The oil-free compressor according to claim 7, characterized in that, The transmission mechanism includes: a first gear (21), a second gear (22), a rotating arm (23), an electric push rod (24), a fixed plate (25), a gear ring (26), a locking block (27), a fixed block (28), a second spring (29), a locking arm (30), and a sliding surface (31); The first gear (21) is rotatably mounted on the housing (16) and connected to the output end of the motor (20); the second gear (22) is rotatably mounted at the center of the housing (16) and connected to the turntable (11); the first gear (21) and the second gear (22) are meshed; the rotating arm (23) is rotatably mounted on the housing (16) and is V-shaped; the electric push rod (24) is rotatably mounted on the housing (16) and the output end of the electric push rod (24) is rotatably connected to the rotating arm (23) via a pin; the fixed There are two disks (25), which are fixedly installed at both ends of the rotating arm (23); the toothed ring (26) is rotatably installed on the two fixed disks (25); there are several locking blocks (27), which are installed equidistantly along the circumference on the inner side of the toothed ring (26); the fixed block (28) is fixedly installed at the center of the fixed disk (25) and located inside the toothed ring (26); one end of the second spring (29) is fixedly installed on the inner wall of the fixed block (28); one end of the locking arm (30) is fixedly installed on the other end of the second spring (29), and the other end of the locking arm (30) extends out of the fixed block (28).

9. The oil-free compressor according to claim 8, characterized in that, The locking block (27) is triangular in shape, with the two sides of the protruding part towards the center of the toothed ring (26) being the first inclined side (2701) and the second inclined side (2702). The first inclined side (2701) coincides with one diameter of the toothed ring (26), and the second inclined side (2702) is inclined relative to the diameter of the toothed ring (26). The locking arm (30) is wedge-shaped and faces one end of the locking block (27), with the inclined surface forming a sliding surface (31), and the direction of the sliding surface (31) corresponds to the first inclined side (2701).

10. The oil-free compressor according to claim 9, characterized in that, The diameter of the first gear (21) is smaller than the diameter of the second gear (22).

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