A vane air compressor

Abstract

This utility model provides a sliding vane air compressor, belonging to the field of compressor technology. It solves the problem of low service life of existing sliding vane air compressors. This sliding vane air compressor includes a pump body, an eccentric cylinder liner disposed within the pump body, and a rotor rotatably disposed within the eccentric cylinder liner. The rotor includes a shaft and a rotor body. A plurality of sliding vane grooves are radially formed on the outer circumferential surface of the rotor body, distributed along the circumference of the rotor body. Sliding vanes are slidably inserted into each of the sliding vane grooves. Both ends of each sliding vane groove extend to the two end faces of the rotor body. Each end of the sliding vane has a sealing surface, which is flush with the two end faces of the rotor body. The inner bottom surface of the sliding vane groove is curved inward along the radial direction of the rotor body, and the inner edge of the sliding vane protrudes in an arc shape towards the inner bottom surface of the sliding vane groove. This utility model has the advantage of improving the service life of sliding vane air compressors.

Description

Technical Field

[0001] This utility model belongs to the field of compressor technology and relates to a sliding vane air compressor. Background Technology

[0002] A vane air compressor is a device used to compress gas. It includes a pump body, an eccentric cylinder liner installed in the pump body, and a rotor rotatably installed in the eccentric cylinder liner. Bearings are fixed at both ends of the rotor where they connect to the pump body. The bearings support and constrain the rotating rotor in the pump body. Both ends of the pump body are sealed by end caps. The rotor has several vane slots evenly distributed circumferentially. The vanes slide freely in the vane slots along the radial direction of the rotor. When the rotor rotates, the vanes are thrown out of the vane slots under the action of centrifugal force and come into close contact with the inner wall of the eccentric cylinder liner (the inner wall of the eccentric cylinder liner is covered with an oil film). A closed air compression chamber is formed between two adjacent vanes and the inner wall of the eccentric cylinder liner. When the rotor rotates, the volume of the air compression chamber changes with the amount of vane sliding out. During the intake process, air is drawn into the compression chamber through a filter and mixed with the lubricating oil injected into the main unit. During the compression process, the volume of the compression chamber gradually decreases and the pressure gradually increases. Then the oil-gas mixture is discharged through the exhaust port.

[0003] In existing vane air compressors, the vanes are typically rectangular, and the length of the vane within the vane slot aligns with the rotor's axial direction. This means that when the vane is thrown out of the slot under centrifugal force and comes into close contact with the inner wall of the eccentric cylinder liner, and when the vane is at its maximum eccentric position, the portion of the rectangular vane remaining in the vane slot is limited. This results in poor vane stability within the slot, exacerbating mechanical friction between the vane and the rotor, as well as the inner wall of the eccentric cylinder liner, leading to significant wear and energy loss. Therefore, those skilled in the art can easily conceive of solving these problems by increasing the depth of the vane slot and the height of the vane. However, due to the fixed radius of the rotor, the need to reserve a certain radius for the rotor shaft to ensure strength, and the requirement to reserve a portion of the end wall on both ends of the rotor to abut against the end cover to form a seal and prevent the compressed gas in the air compression chamber from leaking along the rotor axis, the increase in the depth of the vane groove and the height of the vane is limited. This still cannot solve the problem of poor stability of the vane in the vane groove. Secondly, since efficient lubrication measures cannot be taken at the bearing, and the rotor speed is high, serious wear will occur between the rotor and the bearing after long-term use, resulting in a short service life of the vane air compressor. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a sliding vane air compressor. The technical problem this invention aims to solve is the short service life of existing sliding vane air compressors.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A vane-type air compressor includes a pump body, an eccentric cylinder liner disposed within the pump body, and a rotor rotatably disposed within the eccentric cylinder liner. The rotor includes a shaft and a rotor body. A vane groove is radially formed on the outer circumferential surface of the rotor body. The vane groove has a plurality of grooves distributed along the circumference of the rotor body. A vane is slidably inserted into each vane groove. The vane is characterized in that both ends of the vane groove extend to the two end faces of the rotor body, and both ends of the vane have sealing surfaces. The two sealing surfaces are flush with the two end faces of the rotor body. The inner bottom surface of the vane groove is curved inward along the radial direction of the rotor body, and the inner edge of the vane protrudes in an arc shape toward the inner bottom surface of the vane groove.

[0007] Unlike existing rectangular vane compressors, this vane-type air compressor creatively utilizes a pre-reserved portion on the rotor. While retaining the rotor-end-cover abutment area, it cleverly designs the contour of the vane groove bottom wall to be curved radially inward along the rotor body. Simultaneously, the inner edge of the vane protrudes arc-shaped towards the bottom surface of the vane groove. Compared to traditional rectangular vanes, while ensuring the strength of the shaft and the end wall of the rotor body, this design ensures that when the vane contacts and seals with the inner wall of the eccentric cylinder liner at any rotation angle, the vane always has at least one additional arc-shaped portion. The vane is positioned within the vane groove, providing sufficient support and guidance for the vane within the groove. This significantly improves the stability of the vane within the groove and reduces tilting and swaying during use. Furthermore, the sealing surfaces at both ends of the vane are flush with the two end faces of the rotor body, and end caps are provided on the two end faces of the rotor body. These end caps provide limiting support for the movement of the vane, thereby reducing friction between the vane and the rotor, as well as the inner wall of the eccentric cylinder liner. This solves the problem of low service life in existing vane-type air compressors.

[0008] In the aforementioned vane-type air compressor, the vane slots have a gap between the ports on both ends of the rotor body and the outer wall of the shaft. This allows the end faces of the rotor body to form a seal with the end covers, preventing leakage of compressed gas from the air compression chamber along the rotor's axial direction.

[0009] In the aforementioned vane-type air compressor, the distance from the inner bottom surface of the vane groove to the center line of the rotating shaft is greater than or equal to the radius of the rotating shaft. This ensures sufficient strength for the rotating shaft.

[0010] In the aforementioned vane-type air compressor, a support plate is fixedly mounted inside the pump body. A first bearing and a second bearing are fixedly mounted on the pump body and the support plate, respectively. The two ends of the rotating shaft are respectively mounted on the first bearing and the second bearing. An oil supply pipe is provided on the support plate. A central oil passage is axially opened inside the rotating shaft. The central oil passage passes through the end face of the rotating shaft located inside the pump body and can communicate with the oil supply pipe. A first oil filter is provided on the oil supply pipe and communicates with the interior of the pump body. The two ends of the central oil passage also have branch oil passages that pass through the side wall of the rotating shaft. The outlets of the two branch oil passages are respectively directed toward the first bearing and the second bearing. When this vane air compressor is working, the lubricating oil in the pump body passes sequentially through the first oil filter, the oil supply pipe, the central oil passage on the rotor shaft (in addition, some lubricating oil will enter the vane groove through the auxiliary oil passage), and two branch oil passages. This allows the lubricating oil to enter the rotational clearance between the rotor and the second bearing, as well as the rotational clearance between the rotor and the first bearing, through the outlet of the branch oil passages. An oil film is formed on the friction surfaces of the rotor and the first and second bearings, thereby reducing the wear of the rotor, the first bearing, and the second bearing, and thus solving the problem of the short service life of existing vane air compressors.

[0011] In the aforementioned vane-type air compressor, the compressor further includes a cooler equipped with a cooling fan. The pump body is connected to an oil inlet pipe and an oil outlet pipe, both communicating with the interior of the pump body. A second oil filter is connected to the oil inlet pipe. The oil outlet pipe and the oil inlet pipe are respectively connected to the inlet and outlet of the cooler. The cooler, equipped with a cooling fan, cools the lubricating oil entering the cooler through the oil outlet pipe. The cooled lubricating oil then flows back into the pump body through the oil inlet pipe, reducing the probability of equipment failure and downtime caused by abnormal oil temperature. Furthermore, the second oil filter filters the lubricating oil returning to the pump body, thereby extending the service life of the vane-type air compressor.

[0012] In the aforementioned sliding vane air compressor, the compressor further includes an air receiver tank and an exhaust check valve. A pulley is located at the bottom of the air receiver tank, and an adjacent mounting base and support base are located at the top. A motor is fixedly mounted on the mounting base, and the motor's output shaft is connected to the rotor via a flexible coupling. The pump body is fixedly mounted on the support base and is connected to the air receiver tank. The cooler, motor, and pump body are arranged sequentially along the length of the air receiver tank. This design makes the sliding vane air compressor more compact.

[0013] In the aforementioned vane-type air compressor, a support frame is fixedly connected between the motor and the pump body, and the support frame is located on the outer periphery of the flexible coupling. The support frame provides better support for the motor and pump body, improving the structural strength of this vane-type air compressor.

[0014] Compared with existing technologies, the advantages of this sliding vane air compressor are as follows: Unlike the rectangular sliding vanes of existing technologies, this sliding vane air compressor creatively utilizes the reserved parts on the rotor. While retaining the abutment part between the rotor and the end cover, it cleverly sets the contour of the bottom wall of the sliding vane groove to be curved inward along the radial direction of the rotor body. At the same time, the inner edge of the sliding vane protrudes in an arc shape towards the bottom surface of the sliding vane groove. Compared with traditional rectangular sliding vanes, while ensuring the strength of the shaft and the end wall of the rotor body, it ensures that when the sliding vane contacts the inner wall of the eccentric cylinder liner at any rotation angle and forms a seal, the sliding vane... Each vane has at least one additional arc-shaped portion located within the vane groove, providing sufficient support and guidance for the vane within the groove. This significantly improves the stability of the vane within the groove and reduces tilting and swaying during use. Furthermore, the sealing surfaces at both ends of the vane are flush with the two end faces of the rotor body, and end caps are provided on the two end faces of the rotor body. These end caps provide limiting support for the movement of the vane, thereby reducing friction between the vane and the rotor, as well as the inner wall of the eccentric cylinder liner. This addresses the problem of low service life in existing vane-type air compressors. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of this vane air compressor.

[0016] Figure 2 This is a sectional view of the pump body, eccentric cylinder liner, rotor, support plate, and end cover of this vane air compressor.

[0017] Figure 3 This is a three-dimensional structural diagram of the rotor of this vane air compressor.

[0018] Figure 4 This is a cross-sectional view of the rotor of this vane air compressor.

[0019] Figure 5 This is a three-dimensional structural diagram of the support plate, oil pipeline, and first oil filter of the vane air compressor.

[0020] Figure 6 This is a three-dimensional structural diagram of the eccentric cylinder liner of this vane air compressor.

[0021] In the diagram, 1. Pump body; 2. Rotor; 2a. Shaft; 2a1. Central oil passage; 2a2. Branch oil passage; 2a3. Auxiliary oil passage; 2b. Rotor body; 2b1. Sliding vane groove; 3. Support plate; 4. Sliding vane; 4a. Sealing surface; 5. First bearing; 6. Second bearing; 7. Oil supply pipe; 8. First oil filter; 9. Cooler; 10. Cooling fan; 11. Oil inlet pipe; 12. Oil outlet pipe; 13. Air tank; 14. Pulley; 15. Exhaust check valve; 16. Mounting base; 17. Support base; 18. Motor; 18a. Output shaft; 19. Flexible coupling; 20. Support frame; 21. Second oil filter; 22. Oil-gas separator; 23. Eccentric cylinder liner. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] A vane-type air compressor, reference Figure 1-6 The system includes a pump body 1, an eccentric cylinder liner 23 disposed within the pump body 1, and a rotor 2 rotatably disposed within the eccentric cylinder liner 23. The rotor 2 includes a shaft 2a and a rotor body 2b. A sliding vane groove 2b1 is radially formed on the outer circumferential surface of the rotor body 2b. Several sliding vane grooves 2b1 are distributed circumferentially along the rotor body 2b. Sliding vanes 4 are slidably inserted into each sliding vane groove 2b1. Both ends of the sliding vane groove 2b1 extend to the two end faces of the rotor body 2b. Both ends of the sliding vane 4 have sealing surfaces 4a, which are flush with the two end faces of the rotor body 2b. The inner bottom surface of the sliding vane groove 2b1 is curved inwards radially along the rotor body 2b, and the inner edge of the sliding vane 4 protrudes in an arc shape towards the inner bottom surface of the sliding vane groove 2b1 (see reference). Figure 4 In this embodiment, preferably, the sliding vane groove 2b1 has a gap between the port on both ends of the rotor body 2b and the outer wall of the rotating shaft 2a, and the distance from the inner bottom surface of the sliding vane groove 2b1 to the center line of the rotating shaft 2a is greater than or equal to the radius of the rotating shaft 2a.

[0024] Reference Figure 3 , Figure 4 and Figure 5Furthermore, a support plate 3 is fixed inside the pump body 1, and a first bearing 5 and a second bearing 6 are fixed on the pump body 1 and the support plate 3, respectively. The two ends of the rotating shaft 2a are respectively set on the first bearing 5 and the second bearing 6. An oil supply pipe 7 is provided on the support plate 3. A central oil passage 2a1 is axially opened inside the rotating shaft 2a. The central oil passage 2a1 penetrates the end face of the rotating shaft 2a located inside the pump body 1 and can communicate with the oil supply pipe 7. A first oil filter 8 is provided on the oil supply pipe 7 and is connected to the interior of the pump body 1. The two ends of the central oil passage 2a1 also have branch oil passages 2a2 that penetrate the side wall of the rotating shaft 2a, and the outlets of the two branch oil passages 2a2 are respectively set towards the first bearing 5 and the second bearing 6.

[0025] Reference Figure 1 and Figure 2 Specifically, this vane air compressor also includes a cooler 9, on which a cooling fan 10 is provided. The pump body 1 is connected to an oil inlet pipe 11 and an oil outlet pipe 12, which are respectively connected to the inside of the pump body 1. A second oil filter 21 is connected to the oil inlet pipe 11. The oil outlet pipe 12 and the oil inlet pipe 11 are respectively connected to the inlet and outlet of the cooler 9.

[0026] Reference Figure 1 and Figure 2 More specifically, this vane air compressor also includes an air tank 13 and an exhaust check valve 15. The bottom of the air tank 13 is provided with a pulley 14, and the top of the air tank 13 has an adjacent mounting base 16 and a support base 17. A motor 18 is fixed on the mounting base 16, and the output shaft 18a of the motor 18 is connected to the rotor 2 through a flexible coupling 19. The pump body 1 is fixed on the support base 17. In this embodiment, the support base 17 is preferably also provided with a vibration damping pad. The pump body 1 is connected to the air tank 13. The cooler 9, the motor 18 and the pump body 1 are arranged sequentially along the length of the air tank 13.

[0027] In this embodiment, a support frame 20 is preferably fixedly connected between the motor 18 and the pump body 1, and the support frame 20 is located on the outer periphery of the flexible coupling 19. Depending on actual usage requirements, a protective cover can also be provided on the outer periphery of the support frame 20.

[0028] Unlike existing rectangular vane compressors, this vane-type air compressor creatively utilizes a pre-reserved portion on the rotor 2. While retaining the contact area between the rotor 2 and the end cover, it cleverly shapes the bottom wall of the vane groove 2b1 into an arc shape that curves radially inward along the rotor body 2b. Simultaneously, the inner edge of the vane 4 protrudes arc-shaped towards the inner bottom surface of the vane groove 2b1. Compared to traditional rectangular vanes, while ensuring the strength of the shaft and the end wall of the rotor body, this design ensures that when the vane 4 contacts and seals with the inner wall of the eccentric cylinder liner 23 at any rotation angle, the vane 4 always has at least one additional arc-shaped portion. Within the vane groove 2b1, the vane 4 has sufficient support and guidance, which greatly improves the stability of the vane 4 within the vane groove 2b1 and reduces tilting and swaying during use. On the other hand, the sealing surfaces at both ends of the vane 4 are flush with the two end faces of the rotor body 2b, and end caps are provided on the two end faces of the rotor body 2b, which can limit and support the movement of the vane 4. This reduces the friction between the vane 4 and the rotor and the inner wall of the eccentric cylinder liner 23, thereby solving the problem of low service life of existing vane air compressors.

[0029] The working principle of this vane air compressor is explained below:

[0030] When this vane air compressor is working, the output shaft 18a of the motor 18 drives the rotor 2 to rotate through the flexible coupling 19. As the rotor 2 rotates, the vanes 4 on the rotor 2 move in and out of the vane groove 2b1 to form a closed space (a closed air compression chamber is formed between two adjacent vanes 4 and the inner wall of the eccentric cylinder liner 23). The air is compressed by the rotation of the rotor 2. The compressed air is filtered by the oil-gas separator 22 and then stored in the air tank 13.

[0031] The flow of lubricating oil during the operation of this vane air compressor is as follows:

[0032] During operation, the lubricating oil in the pump body 1 passes sequentially through the first oil filter 8, the oil supply pipe 7, the central oil passage 2a1 on the rotor 2 (in addition, some lubricating oil enters the vane groove 2b1 through the auxiliary oil passage 2a3 to reduce the wear of the vane 4), and two branch oil passages 2a2. This allows the lubricating oil to enter the rotational gaps between the rotor 2 and the first bearing 5, as well as the rotational gaps between the rotor 2 and the second bearing 6, forming an oil film on the friction surfaces of both the rotor 2 and the first bearing 5 and the second bearing 6. This reduces the wear of the rotor 2, the first bearing 5, and the second bearing 6. Simultaneously, the lubricating oil in the pump body 1 enters the cooler 9 through the oil outlet pipe 12 and is cooled by the cooling fan 10. After cooling, the lubricating oil is filtered through the oil inlet pipe 11 and the second oil filter 21, then passes through the pump body 1 into the intake chamber of the eccentric cylinder liner 23 to mix with gas, compress, and discharge back into the pump body 1. This process reduces the probability of equipment failure and downtime caused by abnormal oil temperature and impurities in the oil, extending the service life.

[0033] It should be noted that, since oil seals are also provided at both ends of the rotor 2 and between the pump body 1 and the support plate 3, with the two oil seals located on the outer sides of the first bearing 5 and the second bearing 6 respectively, the lubricating oil will not leak from the connection between the rotor 2 and the pump body 1 and the support plate 3. At the same time, when this vane air compressor stops working, the high-pressure gas enters the air storage tank 13 through the exhaust check valve 15 for storage, and the high-pressure gas remaining in the pump body 1 is slowly discharged through the exhaust valve, so that the pressure in the pump body 1 drops to zero, so as to facilitate the next no-load start-up, and so on continuously.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A vane-type air compressor, comprising a pump body (1), an eccentric cylinder liner (23) disposed within the pump body (1), and a rotor (2) rotatably disposed within the eccentric cylinder liner (23), wherein the rotor (2) comprises a shaft (2a) and a rotor body (2b), and a vane groove (2b1) is radially formed on the outer circumferential surface of the rotor body (2b), the vane groove (2b1) having a plurality of grooves distributed along the circumference of the rotor body (2b), and a vane (4) is slidably inserted into each vane groove (2b1), characterized in that, The two ends of the sliding vane groove (2b1) extend to the two end faces of the rotor body (2b), and the two ends of the sliding vane (4) have sealing surfaces (4a). The two sealing surfaces (4a) are flush with the two end faces of the rotor body (2b), and the inner bottom surface of the sliding vane groove (2b1) is curved inward along the radial direction of the rotor body (2b). The inner edge of the sliding vane (4) protrudes in an arc shape toward the inner bottom surface of the sliding vane groove (2b1).

2. A sliding vane air compressor as claimed in claim 1 wherein, The sliding vane groove (2b1) has a gap between the port on both ends of the rotor body (2b) and the outer wall of the shaft (2a).

3. A sliding vane air compressor as claimed in claim 1 wherein, The distance from the inner bottom surface of the sliding groove (2b1) to the center line of the rotating shaft (2a) is greater than the radius of the rotating shaft (2a).

4. A vane-type air compressor according to claim 1, 2, or 3, characterized in that, A support plate (3) is fixed inside the pump body (1). A first bearing (5) and a second bearing (6) are fixed on the pump body (1) and the support plate (3), respectively. The two ends of the rotating shaft (2a) are respectively set on the first bearing (5) and the second bearing (6). An oil supply pipe (7) is set on the support plate (3). A central oil passage (2a1) is axially opened inside the rotating shaft (2a). The central oil passage (2a1) penetrates the end face of the rotating shaft (2a) located inside the pump body (1) and can communicate with the oil supply pipe (7). A first oil filter (8) is set on the oil supply pipe (7) and is connected to the interior of the pump body (1). The two ends of the central oil passage (2a1) also have branch oil passages (2a2) that penetrate the side wall of the rotating shaft (2a). The outlets of the two branch oil passages (2a2) are respectively set towards the first bearing (5) and the second bearing (6).

5. A sliding vane air compressor as claimed in claim 4 wherein, This vane air compressor also includes a cooler (9), on which a cooling fan (10) is provided. The pump body (1) is connected to an oil inlet pipe (11) and an oil outlet pipe (12) that are respectively connected to the inside of the pump body (1). The oil inlet pipe (11) is connected to a second oil filter (21). The oil outlet pipe (12) and the oil inlet pipe (11) are respectively connected to the inlet and outlet of the cooler (9).

6. A sliding vane air compressor as claimed in claim 5 wherein, This vane air compressor also includes an air tank (13) and an exhaust check valve (15). The bottom of the air tank (13) is provided with a pulley (14). The top of the air tank (13) has an adjacent mounting base (16) and a support base (17). A motor (18) is fixed on the mounting base (16). The output shaft (18a) of the motor (18) is connected to the rotor (2) through a flexible coupling (19). The pump body (1) is fixed on the support base (17). The pump body (1) is connected to the air tank (13). The cooler (9), the motor (18) and the pump body (1) are arranged sequentially along the length of the air tank (13).

7. A vane-type air compressor according to claim 6, characterized in that, A support frame (20) is fixedly connected between the motor (18) and the pump body (1), and the support frame (20) is located on the outer periphery of the flexible coupling (19).

Images