High-pressure oil-free scroll compressor and driving mechanism thereof

Abstract

The application relates to the field of compressors, and discloses a high-pressure oil-free scroll compressor and a driving mechanism thereof, which comprises a driving mechanism, a belt pulley, a driving disc b and a fixed disc, the rotating central shaft of the belt pulley is fixedly connected with a driving main shaft, the surface of the front end of the driving main shaft is provided with a driving main shaft eccentric section, the outer surface of the driving main shaft eccentric section is in contact with a driving disc a, driving disc bearings are arranged at the four corners of the driving disc a and the driving disc b, an eccentric pin shaft sleeve is arranged on the inner wall of the driving disc bearing, and the inner side wall of the eccentric pin shaft sleeve is inserted with an eccentric pin through a flat key. In the application, the eccentric design of the driving main shaft makes the driving disc generate translational motion, two-stage compression is realized, the problem that the exhaust pressure of the oil-free scroll air compressor is difficult to reach above 1.2 Mpa is effectively solved, the demand of the rail transit, automobile braking and other industries for high exhaust pressure is met, and reliable air sources are provided for the industries.

Description

Technical Field

[0001] This invention relates to the field of compressors, and more particularly to a high-pressure oil-free scroll compressor and its drive mechanism. Background Technology

[0002] Oil-free scroll air compressors are a type of air compressor widely used in many fields such as industrial production, medical equipment, and food processing. They operate based on the scroll compression principle and emphasize that no lubricating oil is used during the compression process.

[0003] Currently, most machines on the market with exhaust pressures of 1.2 MPa or higher are screw compressors, while oil-free scroll air compressors have shortcomings in terms of exhaust pressure and structural design.

[0004] However, traditional oil-free scroll air compressors struggle to reach a discharge pressure of 1.2 MPa, and the discharge temperature is excessively high at large displacements, which the materials of the moving and stationary discs cannot withstand. Furthermore, the back pressure generated during compression exerts axial pressure on the bearings of the anti-rotation mechanism, accelerating bearing aging, increasing noise and power consumption. Additionally, addressing the back pressure issue increases the number of components, raising costs and failure rates, and prevents the implementation of series structures for dual or multiple units. This makes it difficult to reduce size and cost when multiple units are operating. Therefore, a high-pressure oil-free scroll compressor and its drive mechanism are proposed to solve these problems. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a high-pressure oil-free scroll compressor and its drive mechanism, which aims to improve the problems of traditional oil-free scroll air compressors in the prior art, which have difficulty reaching the discharge pressure of 1.2 MPa and have excessively high discharge temperature at large displacement, which the materials of the moving and stationary discs cannot withstand.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a high-pressure oil-free scroll compressor, comprising a drive mechanism, a pulley, a drive disc b, and a fixed disc. The rotational center shaft of the pulley is fixedly connected to a drive main shaft. An eccentric section of the drive main shaft is provided on the surface of its front end. The outer surface of the eccentric section contacts the drive disc a. Drive disc bearings are provided at the four corners of both drive disc a and drive disc b. An eccentric pin sleeve is provided on the inner wall of each drive disc bearing. An eccentric pin is inserted into the inner side wall of the eccentric pin sleeve via a flat key. A moving disc bearing is provided at the center of the eccentric pin. The left outer wall of the moving disc bearing contacts the moving disc a, and the right side of the moving disc bearing contacts the moving disc b. The fixed disc is detachably mounted with the stationary disc a by bolts. The corresponding surface of the stationary disc a is detachably mounted with the stationary disc b by bolts. Stationary disc bearings are provided around the stationary disc a. The outer arc surface of the drive spindle is provided with the main drive bearing. A drive disc a connecting section is provided at the center of the drive disc a, and a drive disc b connecting section is provided at the center of the drive disc b. The drive disc a connecting section on the drive disc a and the drive disc b connecting section on the drive disc b are structurally compatible, facilitating quick installation and stable connection when multiple units are connected in series.

[0007] As a further description of the above technical solution:

[0008] The moving disks a and b are connected back to back by moving disk bearings and bolts to ensure a stable connection and enable translational movement.

[0009] As a further description of the above technical solution:

[0010] The eccentric pin bushing is provided with an eccentric section, and the surface of the eccentric pin is provided with an eccentric pin eccentric section, with a phase angle difference of 180 degrees between the eccentric sections of the two.

[0011] As a further description of the above technical solution:

[0012] The top surface of the stationary disk a is provided with a primary air intake port, and the outer arc surface of the stationary disk a is provided with a primary exhaust port.

[0013] As a further description of the above technical solution:

[0014] The top surface of the stationary disk b is provided with a secondary air intake port, and the outer arc surface of the stationary disk b is provided with a secondary exhaust port.

[0015] As a further description of the above technical solution:

[0016] The eccentric pin passes through and is rotatably connected to the inner wall of the stationary disc bearing.

[0017] As a further description of the above technical solution:

[0018] The drive spindle is an eccentric shaft. Its eccentric design causes the drive disc a to translate, which in turn drives the eccentric pin sleeve and the eccentric pin to move eccentrically.

[0019] The present invention has the following beneficial effects:

[0020] 1. In this invention, the eccentric design of the drive spindle enables the drive disc to perform translational motion, achieving two-stage compression. This effectively solves the problem that the exhaust pressure of oil-free scroll air compressors is difficult to reach above 1.2 MPa, meeting the high exhaust pressure requirements of industries such as rail transit and automotive braking, and providing these industries with a reliable air source.

[0021] 2. In this invention, high-rigidity angular contact ball bearings are set at the four corners of the drive disk to bear radial and axial composite loads, reduce bearing wear, extend service life, and reduce noise generated by back pressure. At the same time, a self-lubricating sliding bearing is set outside the drive spindle to reduce rotational friction. Compared with traditional rolling bearings, the power consumption of the whole machine is reduced by 12%, achieving the effect of low noise and low power consumption.

[0022] 3. In this invention, a mortise and tenon joint structure is used to connect the drive disc, which facilitates the series connection of multiple units, effectively reducing the system volume by more than 40%, reducing the number of parts, lowering costs and failure rates. Furthermore, through a unique structural design, the exhaust temperature and lifespan issues of large-displacement oil-free scroll air compressors are solved, meeting the market demand for clean, maintenance-free air compressors and making this invention highly competitive in the market. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0024] Figure 2 This is a schematic cross-sectional plan view of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0025] Figure 3 This is a plan view of the moving disc bearing of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0026] Figure 4 This is a schematic diagram of the overall exploded disassembly structure of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0027] Figure 5 This is a planar schematic diagram of the eccentric pin and eccentric pin segment of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0028] Figure 6This invention provides a high-pressure oil-free scroll compressor and its drive mechanism. Figure 5 Enlarged structural diagram of section A;

[0029] Figure 7 This is a planar schematic diagram of the drive disk b connecting section and the drive disk a connecting section of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0030] Figure 8 This invention provides a high-pressure oil-free scroll compressor and its drive mechanism. Figure 7 Enlarged structural diagram of section B;

[0031] Figure 9 This is a three-dimensional structural diagram of the inlet and outlet of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0032] Figure 10 This is a three-dimensional structural diagram of the eccentric pin bushing and the eccentric section of the eccentric bushing of a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0033] Figure 11 This is a three-dimensional structural diagram of the eccentric pin and eccentric section of the eccentric pin in a high-pressure oil-free scroll compressor and its drive mechanism proposed in this invention.

[0034] Legend:

[0035] 1. Pulley; 2. Drive spindle; 201. Eccentric section of drive spindle; 3. Drive disc a; 301. Connecting section of drive disc a; 4. Stationary disc a; 5. Moving disc a; 6. Moving disc b; 7. Stationary disc b; 8. Drive disc b; 801. Connecting section of drive disc b; 9. Eccentric pin bushing; 901. Eccentric section of eccentric bushing; 10. Eccentric pin; 1001. Eccentric section of eccentric pin; 11. Moving disc bearing; 12. Stationary disc bearing; 13. Drive disc bearing; 14. Main drive bearing; 15. First-stage intake port; 16. First-stage exhaust port; 17. Second-stage intake port; 18. Second-stage exhaust port. Detailed Implementation

[0036] 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.

[0037] Reference Figures 1-2 and Figure 8This invention provides an embodiment of a high-pressure oil-free scroll compressor and its drive mechanism, comprising a pulley 1, a drive disc b8, and a fixed disc. The rotation center shaft of the pulley 1 is fixedly connected to a drive spindle 2, which is an eccentric shaft. Its eccentric design causes the drive disc b8 to translate, thereby driving the eccentric pin sleeve 9 and eccentric pin 10. The eccentric design of the drive spindle 2 differs from the traditional direct drive of the drive disc by the spindle, which easily leads to leakage in the high-pressure area. Simultaneously, it effectively avoids gas leakage caused by the spindle penetrating the center of the drive disc, laying the foundation for two-stage compression. The front end surface of the drive spindle 2 is provided with an eccentric section 201, which is precision ground. Its outer surface is clearance-fitted with the drive disc b8. Through precise eccentricity design, the translational movement of the drive disc b8 can be flexibly adjusted. The process adapts to different compression ratio requirements. The outer surface of the eccentric section 201 of the drive spindle contacts the drive disk a3. The center of drive disk a3 is provided with drive disk a connecting section 301, and the center of drive disk b8 is provided with drive disk b connecting section 801. By providing drive disk b connecting section 801, the shortcomings of traditional compressors in achieving multi-unit series connection are addressed. The connection section 301 of drive disk a3 and drive disk b8 of drive disk b8 are structurally compatible, facilitating quick installation and stable connection when multiple units are connected in series. The drive disk a connecting section 301 of drive disk a3 and drive disk b8 of drive disk b8 adopt a mortise and tenon structure for compatibility. When multiple units are connected in series, quick installation can be achieved simply by tightening bolts. Compared with the traditional parallel structure, the system volume can be reduced by more than 40%, effectively reducing costs.

[0038] Reference Figures 3-4 and Figures 8-11 Drive disc bearings 13 are installed at the four corners of drive discs a3 and b8. By installing drive disc bearings 13, the problem of large axial load and short life of bearings caused by back pressure in traditional structures is solved. At the same time, drive disc bearings 13 are high-rigidity angular contact ball bearings. Their inner walls are interference-fitted with eccentric pin sleeves 9. While bearing radial and axial combined loads, bearing wear is significantly reduced, and the service life is extended by more than 3 times. Eccentric pin sleeves 9 are installed on the inner walls of drive disc bearings 13. Eccentric pins 10 are inserted into the inner side walls of eccentric pin sleeves 9 through flat keys. Eccentric pin sleeves 9 are provided with eccentric sections 901, and eccentric pins 10 are provided with eccentric sections 1001 on the surface of eccentric pins 10. The phase angle difference between the eccentric sections of the two is 180 degrees. This design is inspired by the crankshaft principle of an engine, so that drive discs a5 and b6 always maintain a 180-degree phase difference with drive discs a3 and b8 during the movement.

[0039] Reference Figures 4-7A moving disc bearing 11 is located at the center of the eccentric pin 10. The left outer wall of the moving disc bearing 11 contacts the moving disc a5, and the right side of the moving disc bearing 11 contacts the moving disc b6. The moving disc a5 and the moving disc b6 are fixedly connected back to back by bolts. The moving disc a5 and the moving disc b6 are fixed together back to back by the moving disc bearing 11 and bolts to ensure a stable connection and enable translational movement. This back-to-back structure cancels out the back pressure generated during compression, reducing the axial load of the bearing by 80% and reducing the operating noise by 15dB. The stationary disc a4 is detachably installed on the fixed disc by bolts. The top surface of the stationary disc a4 has a first-stage air intake port 15, and the outer arc surface of the stationary disc a4 has a first-stage exhaust port 16. The corresponding surface of the stationary disc a4 is detachably installed on the stationary disc b7 by bolts.

[0040] Reference Figure 4 and Figure 9 The top surface of the stationary disc b7 has a secondary intake port 17, and the outer arc surface of the stationary disc b7 has a secondary exhaust port 18. Through the two-stage compression design, the exhaust pressure can easily reach over 12 bar, solving the problem of insufficient exhaust pressure in traditional oil-free scroll air compressors. Stationary disc bearings 12 are provided around the stationary disc a4, providing stable support for the movement of the moving disc. Compared with traditional structures, this improves the compressor's operational stability by 40%. An eccentric pin 10 passes through and rotatably connects to the inner wall of the stationary disc bearing 12. The outer arc surface of the drive shaft 2 is equipped with a main drive bearing 14, which uses a self-lubricating sliding bearing to reduce rotational friction of the drive shaft 2. Compared with traditional rolling bearings, this reduces the overall power consumption by 12%.

[0041] Working Principle: This high-pressure oil-free scroll compressor and its drive mechanism consist of components such as pulley 1, drive spindle 2, drive disc a3, drive disc b8, eccentric pin bushing 9, eccentric pin 10, moving disc a5, moving disc b6, stationary disc a4, stationary disc b7, drive disc bearing 13, moving disc bearing 11, and main drive bearing 14. Its core function is to achieve two-stage gas compression, increase exhaust pressure, reduce gas leakage, reduce bearing load, reduce operating noise, and decrease overall power consumption. During operation, the rotation of pulley 1 drives the eccentric drive spindle 2, causing the eccentric section 201 of the drive spindle to engage with... Drive disk a3 generates translational motion. The drive disk a connecting section 301 of drive disk a3 and the drive disk b connecting section 801 of drive disk b8 adopt a tenon-and-mortise structure to facilitate the series connection of multiple units. The drive disk bearings 13 at the four corners of drive disk a3 and drive disk b8 are high-rigidity angular contact ball bearings. Their inner walls are interference-fitted with eccentric pin sleeves 9, which can withstand complex loads and extend service life. The inner side wall of eccentric pin sleeves 9 is connected to eccentric pins 10 by a flat key. The phase angle difference between the eccentric section 901 of eccentric sleeve 9 and the eccentric section 1001 of eccentric pin 10 is 180 degrees. The eccentric pin 10 has a centrally located rotating disc bearing 11. Rotating discs a5 and b6 are fixed back-to-back by the rotating disc bearing 11 and bolts, ensuring that rotating discs a5 and b6 maintain a phase difference with driving discs a3 and b8 during movement, thus offsetting back pressure and reducing the axial load on the bearings. During compression, the outer arc surface of the pulley 1 is fixed to the stationary disc a4. A primary intake port 15 is opened on the top surface of stationary disc a4, and a secondary intake port 17 is opened on the top surface of stationary disc b7. Gas enters the compression chamber formed by stationary disc a4 and rotating disc a5 through the primary intake port 15, and then through the secondary intake port 17. 7. The gas enters the compression chamber formed by the stationary disc b7 and the moving disc b6. After two stages of compression, the exhaust pressure easily reaches more than 12 bar. The outer arc surface of the stationary disc a4 has a first-stage exhaust port 16, and the outer arc surface of the stationary disc b7 has a second-stage exhaust port 18. The compressed gas is discharged through the first-stage exhaust port 16 and the second-stage exhaust port 18. In addition, the stationary disc bearing 12 around the stationary disc a4 provides stable support for the movement of the moving disc. The main drive bearing 14 set on the outer arc surface of the drive spindle 2 adopts a self-lubricating sliding bearing, which can reduce the rotational friction of the drive spindle 2 and reduce the overall power consumption by 12% compared with traditional rolling bearings.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-pressure oil-free scroll compressor, comprising a drive mechanism, a pulley (1), a drive disc b (8), and a fixed disc, characterized in that: The rotation center shaft of the pulley (1) is fixedly connected to the drive spindle (2). The front end surface of the drive spindle (2) is provided with an eccentric section (201). The outer surface of the eccentric section (201) contacts the drive disc a (3). Drive disc bearings (13) are provided at the four corners of the drive disc a (3) and the drive disc b (8). The drive disc bearings (13) are high-rigidity angular contact ball bearings. An eccentric pin sleeve (9) is provided on the inner wall of the drive disc bearing (13). An eccentric pin (10) is inserted into the inner side wall of the eccentric pin sleeve (9) through a flat key. A moving disc bearing (11) is provided at the center of the eccentric pin (10). The left outer wall of the moving disc bearing (11) contacts the moving disc a (5). The right side of the moving disc bearing (11) is in contact with the moving disc b (6). The fixed disc is detachably mounted with the stationary disc a (4) by bolts. The corresponding surface of the stationary disc a (4) is detachably mounted with the stationary disc b (7) by bolts. The stationary disc a (4) is provided with stationary disc bearings (12) around its perimeter. The outer arc surface of the drive spindle (2) is provided with the main drive bearing (14). The center of the drive disc a (3) is provided with a drive disc a connecting section (301). The center of the drive disc b (8) is provided with a drive disc b connecting section (801). The drive disc a connecting section (301) on the drive disc a (3) and the drive disc b connecting section (801) on the drive disc b (8) are structurally compatible, which facilitates quick installation and stable connection when multiple units are connected in series.

2. The high-pressure oil-free scroll compressor according to claim 1, characterized in that: The moving disks a (5) and b (6) are connected back to back by the moving disk bearing (11) and bolts to ensure a stable connection and enable translational movement.

3. A high-pressure oil-free scroll compressor according to claim 1, characterized in that: The eccentric pin bushing (9) is provided with an eccentric bushing eccentric section (901), and the surface of the eccentric pin (10) is provided with an eccentric pin eccentric section (1001), with a phase angle difference of 180 degrees between the two eccentric sections.

4. A high-pressure oil-free scroll compressor according to claim 1, characterized in that: The top surface of the stationary disc a (4) is provided with a primary air intake port (15), and the outer arc surface of the stationary disc a (4) is provided with a primary exhaust port (16).

5. A high-pressure oil-free scroll compressor according to claim 1, characterized in that: The top surface of the stationary disk b (7) is provided with a secondary air intake port (17), and the outer arc surface of the stationary disk b (7) is provided with a secondary exhaust port (18).

6. A high-pressure oil-free scroll compressor according to claim 1, characterized in that: The eccentric pin (10) passes through and is rotatably connected to the inner wall of the stationary bearing (12).

7. A high-pressure oil-free scroll compressor according to claim 1, characterized in that: The drive spindle (2) is an eccentric shaft. Its eccentric design causes the drive disk a (3) to translate, which in turn drives the eccentric pin sleeve (9) and eccentric pin (10) to move eccentrically.

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