A coaxial high-speed scroll air compressor and design method

Abstract

The application provides a coaxial high-speed scroll air compressor and a design method, which comprises a compression cavity, a permanent magnet motor, a power transmission system and an exhaust pressure stabilizing structure. The compression cavity comprises a driving scroll disc (8) and a driven scroll disc. The permanent magnet motor (7) drives the driving scroll disc to rotate through a driving shaft (2). A plurality of eccentric small shafts (9) for driving the driven scroll disc to rotate are arranged on the driving scroll disc. The driving scroll disc and the driven scroll disc are arranged in opposition and are engaged through coaxial double-tooth variable cross-section scroll teeth at the opposite disc surfaces. When the driving scroll disc and the driven scroll disc rotate, the scroll tooth engagement area between the two discs inhales gas. The inhaled gas is compressed through the engagement process of the variable cross-section scroll teeth, so as to improve the engagement smoothness and increase the compression efficiency. The compressed gas is discharged through the exhaust pressure stabilizing structure. The application can solve the problems of engagement failure and scroll tooth interference of the scroll air compressor in the prior art, and improve the operation stability of the scroll air compressor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressor, in particular to a coaxial high-speed scroll air compressor and a design method. BACKGROUND

[0002] As a core component of fuel cell, the performance of air compressor has a direct impact on the power density, efficiency and reliability of fuel cell. Due to its high efficiency, low noise, small size and other advantages, scroll air compressor becomes an ideal choice for fuel cell gas supply. The pump body of scroll air compressor mainly consists of driving disc, driven disc, driving shaft, eccentric small shaft and sealing bearing. During the operation of the compressor, the motor drives the driving shaft to rotate, and then drives the driving disc to rotate around the driving shaft. There is an eccentric distance between the driving disc and the driven disc, and the driven disc is driven to rotate by the eccentric small shaft. During the compression process, the gas enters from the suction port and is gradually sucked into the peripheral crescent-shaped air cavity connected with the suction cavity. With the closure of the crescent-shaped air cavity, its closed volume is gradually transferred to the middle of the scroll disc and continuously shrinks, and the gas is continuously compressed until the pressure reaches the exhaust pressure. The gas in the compression chamber pushes open the exhaust valve piece on the exhaust port to start exhaust, completing a working cycle.

[0003] During the operation of the existing air compressor, the exhaust valve piece controlling the opening and closing of the exhaust port repeatedly impacts the limiting piece above it under the pressure of high-pressure gas, so that the limiting piece bears a large impact and stress, which is prone to deformation or failure, etc., reducing the service life of the air compressor. With the development of air compressor, the speed and exhaust pressure will be higher and higher, and the impact load will be larger and larger, and the working environment of the exhaust valve piece is more severe, and the impact resistance of the exhaust valve is more demanding.

[0004] At present, the related patents in China for the failure of the exhaust valve piece mainly change the shape design of the exhaust valve piece or add a buffer device to the limiting piece to reduce the stress borne by the exhaust valve piece, thereby reducing the occurrence of its failure. The existing technical solutions mostly rely on the exhaust valve piece to directly control the opening and closing of the exhaust port. However, due to the extremely frequent process, not only does it cause a large mechanical noise problem, but it also easily leads to the failure of the exhaust valve piece due to fatigue, causing bending deformation and other phenomena. These problems directly affect the service life of the air compressor and significantly reduce the overall reliability of the air compressor.

[0005] In summary, the research on scroll air compressor is not only because it has many advantages, but also because it has a wide application prospect and potential for technological innovation.

[0006] The application is based on a self-rotating double-tooth variable cross-section scroll tooth and exhaust pressure stabilizing structure design, which effectively improves the overall efficiency and reliability of the air compressor, the scheme adopts a new self-rotating double-tooth variable cross-section scroll tooth generation method, which can effectively improve the air intake and compression ratio of the air compressor, reduce the probability of interference and meshing failure of the scroll tooth, and control the exhaust pressure fluctuation by combining the exhaust pressure stabilizing structure, thereby effectively improving the operation stability of the air compressor. SUMMARY

[0007] The application provides a coaxial high-speed scroll air compressor and a design method, which can solve the meshing failure and scroll tooth interference problems of the scroll air compressor in the prior art, and improve the operation stability of the scroll air compressor.

[0008] The application adopts the following technical scheme.

[0009] A coaxial high-speed scroll air compressor, comprising a compression cavity, a permanent magnet motor, a power transmission system and an exhaust pressure stabilizing structure, wherein the compression cavity comprises a driving scroll (8) and a driven scroll (10), the permanent magnet motor (7) drives the driving scroll to rotate by a driving shaft (2); a plurality of eccentric small shafts (9) for driving the driven scroll to rotate are arranged on the driving scroll; the driving scroll and the driven scroll are arranged opposite to each other and are engaged by the coaxial double-tooth variable cross-section scroll tooth at the relative disc surfaces, when the driving scroll and the driven scroll rotate, the scroll tooth engagement area between the two discs inhales gas, the inhaled gas is compressed through the engagement process of the variable cross-section scroll tooth, so as to improve the engagement smoothness and increase the compression efficiency, and then the compressed gas is discharged through the exhaust pressure stabilizing structure.

[0010] When the coaxial high-speed scroll air compressor works, the gas is inhaled, compressed and discharged by the movement of the two scrolls, specifically: the external gas is gradually inhaled into the compression cavity from the gas inlet through the engagement of the driving scroll and the driven scroll, the gas is compressed by the crescent-shaped compression cavity formed by the mutual engagement of the scroll teeth, with the gradual closing of the compression cavity, the closed volume gradually shifts to the center of the scroll and continuously shrinks, after the gas is continuously compressed, the pressure gradually rises, until the pressure reaches the exhaust pressure, the exhaust piston (28) of the exhaust pressure stabilizing mechanism is driven to move upward, at this time, the exhaust hole (24) is opened, and the compressed gas in the compression cavity is discharged.

[0011] The center positions of the driving scroll and the driven scroll are different by a rotation size R, and the driven scroll is driven to rotate by the four eccentric small shafts on the driving scroll.

[0012] The driving scroll includes double-toothed variable cross-section scroll teeth, four eccentric pin shaft bearing holes, and a main shaft bearing hole, the driven scroll includes double-toothed variable cross-section scroll teeth, four eccentric pin shaft bearing holes, and an exhaust pipe, the driving scroll and the driven scroll are engaged through the variable cross-section scroll teeth to form a suction cavity, a compression cavity, and an exhaust cavity, the eccentric pin shaft bearing holes are located at the edges of the driving scroll and the driven scroll and do not interfere with the scroll teeth.

[0013] The exhaust pressure stabilizing structure includes an exhaust valve body (27), an exhaust piston (28), and an exhaust valve cover (23), the exhaust valve cover has an exhaust hole (20) for discharging compressed gas;

[0014] When the exhaust piston is pushed upward by the gas to different heights, the exhaust hole is sequentially opened according to the position of the exhaust piston, so that the compressed gas in the compression cavity is discharged from the exhaust hole to the buffer chamber (12) of the gas buffer cavity, and the exhaust hole is closed when the exhaust piston is at a low position;

[0015] The exhaust pipe of the driven scroll exhaust shaft is circular and is located in the middle of the driven scroll;

[0016] The exhaust pipe (14) of the air compressor is connected to the frame through a bearing, the exhaust pipe has an exhaust spring sheet outside, the outlet exhaust pressure of the air compressor is changed by adjusting the pre-pressure of the exhaust spring sheet, and the spring sheet is located at the middle position of the gas buffer cavity.

[0017] The exhaust valve body (27) is connected with the exhaust shaft end cover, the exhaust valve cover is arranged on the exhaust valve body, the exhaust hole is arranged on the exhaust valve body and communicates with the driven scroll exhaust shaft, the flange base (26) of the exhaust valve body is fixed with the driven scroll exhaust shaft (11) end cover of the driven scroll, the flange base is arranged on the bearing part of the exhaust valve body, and the exhaust hole is arranged on the bearing part;

[0018] The exhaust valve body includes a bearing part and a sealing part, the exhaust piston (28) is in abutting fit with the slide rail (29) of the inner wall of the exhaust valve body to form a sliding friction pair, the inner wall of the bearing part and the exhaust valve shell are provided with exhaust holes at corresponding positions, and the exhaust valve shell is further provided with a pressure relief window at the top of the exhaust hole;

[0019] When the gas pressure in the compression cavity pushes the piston to move along the slide rail to the exhaust height, the driven scroll exhaust shaft starts to automatically exhaust, and when the gas pressure is low, the exhaust piston automatically falls to stop the exhaust.

[0020] The permanent magnet motor includes a motor rotor (3), a stator (6), a sheath (5), and a winding, and the power of the permanent magnet motor is transmitted to the driving scroll through the driving shaft;

[0021] The driving shaft is a hollow structure, a bolt component is arranged inside the hollow structure, the bolt component is used for fixing the driving scroll on the driving shaft, the driving shaft is fixed in the air compressor frame through a bearing, and the bottom of the driving shaft is provided with a butterfly spring and a thrust structure;

[0022] The gas buffer cavity is provided with a circular annular heat dissipation water channel at the back, the motor shell (16) of the permanent magnet motor is provided with a circular arc heat dissipation water channel inside, and the circular annular heat dissipation water channel and the circular arc heat dissipation water channel form an integrated water cooling flow channel (17), which is arranged upward at a spiral equal distance from the permanent magnet motor and is cooled by the flow of water cooling water.

[0023] The exhaust hole adopts a tapered exhaust port with gradually increasing diameter to reduce the gas flow rate and reduce the flow noise, the driven disc exhaust shaft is arranged between the exhaust port of the driven scroll and the exhaust pressure stabilizing mechanism, the diameter of the exhaust shaft is greater than that of the exhaust port, and a large-diameter circumferential exhaust shaft is adopted to reduce the gas flow rate and reduce the flow noise;

[0024] The exhaust valve cover is a pressure stabilizing exhaust valve cover, comprising an exhaust hole, a pressure relief window and a limiting mechanism; the pressure relief window is arranged on the top side of the pressure stabilizing exhaust valve cover, and the pressure relief window is used for pressure relief to prevent the gas pressure in the exhaust valve body from being too high;

[0025] The pressure stabilizing exhaust valve cover comprises a connecting portion and a limiting block, and the limiting block is in limiting cooperation with the exhaust piston to prevent the pressure relief window from being frequently opened;

[0026] The number of exhaust holes of the driven scroll is multiple, and the multiple exhaust holes are arranged at equal intervals, the flange base bearing portion and the pressure stabilizing exhaust valve cover are both provided with exhaust holes, when the piston moves upward along the slide rail under the gas force, the flow medium is discharged from the exhaust hole;

[0027] The soundproof plate (13) is arranged between the buffer chamber of the gas buffer cavity and the upper end cover of the exhaust valve body to reduce the exhaust noise.

[0028] The driving scroll and the driven scroll are both provided with reinforcing ribs on the back, the reinforcing ribs are radially distributed from the center of the scroll to the edge and gradually decrease in height;

[0029] The driving scroll and the driven scroll are both provided with a sealing concave groove structure at the top of the variable cross-section scroll tooth, a sealing strip is arranged in the concave groove, the gas is sealed by the sealing strip, and the wall surface of the scroll tooth is coated with a wear-resistant and high-temperature-resistant coating.

[0030] The tooth profile generatrix of the variable cross-section scroll tooth is a variable-diameter base circle involute, the scroll tooth head is corrected by a single circular arc, and the scroll tooth tail is designed with a buffer-shaped flow guide structure.

[0031] The coaxial double-tooth variable cross-section scroll tooth comprises a first driving scroll tooth and a second driving scroll tooth; the meshing profile of the first driving scroll tooth comprises four curves which are smoothly connected, and the four curves are, in sequence, an equidistant curve ab of a first variable-diameter base circle involute, an equidistant curve ac of a first circle involute, an equidistant curve bd of a second circle involute and an equidistant curve cd of a second variable-diameter base circle involute; the driving scroll tooth profile and the static scroll tooth profile achieve complete correct meshing; the thickness of the scroll tooth gradually increases from the outer ring to the center, the thickness of the outermost scroll tooth is the smallest, and the thickness of the scroll tooth at the center is the largest.

[0032] The design method of the coaxial high-speed scroll air compressor is used for designing the tooth shape of the variable cross-section scroll tooth, and has the following steps.

[0033] Step S1, a variable-diameter base circle curve A1 with a base circle radius R b1 , a variable-diameter coefficient x and an involute development angle phi e is drawn;

[0034] Step S2, the variable-diameter base circle curve A1 is rotated by 90°, 180° and 270° respectively to obtain variable-diameter base circle curves B1, C1 and D1;

[0035] Step S3, the generation processes of the first driving scroll tooth and the second driving scroll tooth are the same, in the generation process of the first driving scroll tooth, the line A2 and the line A3 are obtained by taking the eccentric distance as the normal distance through the normal equidistance method, wherein the line A2 and the line A3 are conjugate profiles; the variable-diameter base circle curve A1 is deleted, the inner side profile D2 of the variable-diameter base circle curve D1 is corrected at the tail end of the scroll tooth, and the outer side profile A3 of the variable-diameter base circle curve A1 and the inner side profile D2 of the variable-diameter base circle curve D1 are taken as tooth profile lines to generate the scroll tooth.

[0036] The scheme of the application is based on a self-rotating double-tooth variable cross-section scroll tooth and an exhaust pressure stabilizing structure design, which effectively improves the overall efficiency and reliability of the air compressor, the new self-rotating double-tooth variable cross-section scroll tooth generation method can effectively improve the air intake and compression ratio of the air compressor, reduce the probability of interference and meshing failure of the scroll tooth, and the exhaust pressure fluctuation is controlled by combining the exhaust pressure stabilizing structure, so that the operation stability of the air compressor is effectively improved.

[0037] Through innovative research on the scroll tooth structure of the scroll air compressor, a coaxial high-speed scroll air compressor is invented; the existing traditional oil-free scroll air compressor has certain limitations in flow rate and speed due to the eccentric shaft structure, and the speed is generally 3000-4000r / min; the coaxial high-speed scroll air compressor adopts a center shaft structure and a variable cross-section scroll tooth design, and the rated speed can reach 10000r / min, meeting the requirements of large flow rate, high speed and low pressure fluctuation.

[0038] The present invention incorporates a buffer flow guiding structure at the tail end of the vortex tooth, which effectively reduces the probability of interference and meshing failure during the meshing process of the vortex disk, and greatly improves the stability and efficiency of the air compressor.

[0039] The invention incorporates heat dissipation channels on the back of the gas buffer chamber and inside the motor housing, and applies a high-temperature resistant coating to the tooth walls of the vortex gears, effectively reducing the possibility of failure caused by thermal deformation of the internal vortex gears and other structures of the air compressor. A pressure-stabilizing exhaust mechanism is installed at the exhaust end cover. When the vortex gears mesh and compress the gas in the compression chamber, the pressure in the compression chamber reaches a certain level, which will drive the piston to move for automatic exhaust. After the exhaust process is completed, the piston automatically returns to the starting position.

[0040] The present invention has a sound-absorbing plate between the buffer chamber and the upper cover, which reduces exhaust noise to a certain extent and provides users with a better experience during use.

[0041] This invention creatively proposes a coaxial double-tooth variable cross-section scroll tooth design, which effectively replaces the existing dynamic and static scroll design of scroll air compressors, solving the problem that the air compressor cannot work properly due to interference of the scroll teeth during operation. The design of the pressure stabilizing exhaust mechanism in this invention can effectively reduce exhaust pressure fluctuations. It has a simple structure and reliable operation, ensuring that users enjoy a comfortable experience while being economical, making it suitable for the field of air compressors.

[0042] This invention effectively replaces the eccentric main shaft design of existing scroll air compressors by setting up a hollow drive shaft and an eccentric small shaft power transmission system. It eliminates the need to match and check the eccentric balance block on the main shaft, ensuring the reliability of scroll gear meshing while also ensuring the stability of drive shaft rotation, greatly reducing the probability of resonance. Furthermore, the hollow main shaft design can effectively dissipate some heat.

[0043] This invention effectively improves the strength of the scroll plate by setting an annular reinforcing rib on the back of the scroll plate, enabling the scroll plate to withstand higher rotational speeds and increasing the intake volume.

[0044] This invention proposes a novel method for generating variable cross-section vortex teeth, which effectively improves the meshing smoothness of vortex teeth and significantly increases the compression efficiency of the compression chamber.

[0045] In existing scroll air compressors, the stationary scroll plate remains stationary during operation, while the active scroll plate is driven by an eccentric main shaft to compress the gas in the compression chamber. This eccentric main shaft structure design limits the speed of the scroll air compressor. As the performance requirements of air compressors continue to increase, the danger and limitations of the eccentric main shaft at high speeds become more significant. The coaxial double-tooth variable cross-section scroll tooth proposed in this invention is a structural redesign that solves the problem of scroll tooth limitation in the high-speed development of scroll compressors.

[0046] The coaxial high-speed scroll air compressor proposed in this invention does not require matching and checking eccentric balance blocks on the main shaft during use. It changes the eccentric motion of the traditional scroll plate to rotational motion, thereby increasing the speed of the scroll air compressor and conforming to the development trend of high-speed air compressors.

[0047] The pressure-stabilizing exhaust valve proposed in this invention is structurally redesigned. By setting a conical exhaust port, the gas flow rate can be effectively reduced and the flow noise can be reduced. The opening area of ​​the exhaust port can be indirectly controlled by the piston rising height, which can effectively reduce the exhaust pressure fluctuation.

[0048] This invention provides a coaxial high-speed scroll air compressor and an exhaust pressure stabilizing structure design method. The invention uses a permanent magnet motor to drive the drive shaft and the drive scroll plate to rotate synchronously. During this process, torque is transmitted from the eccentric small shaft to the driven scroll plate. Gas is drawn in through the meshing of the scroll plates, and the dynamic crescent-shaped compression chamber formed by the meshing of the scroll teeth achieves efficient compression of the inhaled gas. After compression, the gas exerts an upward thrust on the piston through the exhaust port. The piston's movement opens and closes the exhaust valve's exhaust port, so that automatic exhaust begins whenever the gas pressure in the compression chamber pushes the piston to the exhaust height along the slide rail. When the pressure is low, the piston automatically stops exhausting as it falls, effectively replacing the existing exhaust valve plate structure to control the exhaust stroke of the compression chamber. The coaxial double-tooth variable cross-section scroll gear design method proposed in this invention can effectively increase the speed of the scroll air compressor, reduce the probability of scroll gear interference, and closely match the development trend of high-speed scroll air compressors. This invention can significantly reduce the heat generated during the operation of the scroll air compressor, reduce the thermal deformation of the scroll gear, and improve the operational reliability of the air compressor. This invention can effectively increase the operating speed of the scroll air compressor, eliminates the need for matching and checking eccentric balance blocks on the main shaft, has a simple structure, is reliable in operation, and is easy to install, making it suitable for the air compressor field. Attached Figure Description

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0050] Appendix Figure 1 A schematic diagram of the internal structure of a coaxial high-speed scroll air compressor provided for an embodiment of the present invention;

[0051] Appendix Figure 2 A schematic diagram of the external structure of a coaxial double-tooth variable cross-section vortex tooth provided for an embodiment of the present invention;

[0052] Appendix Figure 3 To be continued Figure 8 Design process diagram of coaxial double-tooth variable cross-section vortex tooth provided for embodiments of the present invention;

[0053] Appendix Figure 9Meshing profile diagram of coaxial double-tooth variable cross-section vortex teeth provided for embodiments of the present invention;

[0054] Appendix Figure 10 A schematic diagram of the external structure of an exhaust valve assembly provided for an embodiment of the present invention;

[0055] Appendix Figure 11 For the appendix Figure 5 A schematic diagram of the internal structure of the exhaust valve in the diagram;

[0056] In the diagram: 1. Bracket; 2. Drive shaft; 3. Rotor; 4. Magnet; 5. Sheath; 6. Stator; 7. Permanent magnet motor; 8. Driven scroll plate; 9. Eccentric small shaft; 10. Driven scroll plate; 11. Driven plate exhaust shaft; 12. Buffer chamber; 13. Silencing plate; 14. Exhaust pipe; 15. Top cover; 16. Motor housing; 17. Water cooling channel; 18. Pressure relief window; 19. Limiting block; 20. Exhaust hole; 21. Exhaust valve cover end cap; 22. Exhaust valve wall; 23. Exhaust valve cover; 24. Exhaust port; 25. Bearing part; 26. Flange base; 27. Exhaust valve body; 28. Exhaust piston; 29. ​​Slide rail. Detailed Implementation

[0057] Next, the technical solutions of the embodiments of the present invention will be fully and clearly described with reference to the accompanying drawings. It should be noted that the presented embodiments are merely a part of the many possible implementations of the present invention, and not all of them. The following description of at least one representative embodiment is intended to illustrate rather than limit, and should not be construed as any constraint on the present invention or its application or use. Based on this, any other implementations derived by those skilled in the art from these embodiments without inventive effort are within the scope of protection covered by the present invention.

[0058] As shown in the figure, a coaxial high-speed scroll air compressor includes a compression chamber, a permanent magnet motor, a power transmission system, and an exhaust pressure stabilizing structure. The compression chamber includes an active scroll plate 8 and a driven scroll plate 10. The permanent magnet motor 7 drives the active scroll plate to rotate via an active shaft 2. The active scroll plate is provided with multiple eccentric small shafts 9 for driving the driven plate to rotate. The active and driven scroll plates are arranged opposite each other and mesh with coaxial double-tooth variable cross-section scroll teeth on their opposite surfaces. When the active and driven scroll plates rotate, gas is drawn in through the meshing area of ​​the scroll teeth between the two plates. The gas is compressed through the meshing process of the variable cross-section scroll teeth to improve meshing smoothness and increase compression efficiency. The compressed gas is then discharged through the exhaust pressure stabilizing structure.

[0059] When the coaxial high-speed scroll air compressor is working, the gas is drawn in, compressed and discharged through the movement of two scroll plates. Specifically, the external gas is gradually drawn into the compression chamber through the meshing of the active scroll plate and the passive scroll plate. The crescent-shaped compression chamber formed by the meshing of the scroll teeth compresses the gas. As the compression chamber gradually closes, its closed volume gradually shifts towards the center of the scroll plate and continuously contracts. After the gas is continuously compressed, the pressure gradually rises until the pressure reaches the exhaust gas pressure, which pushes the exhaust piston 28 of the exhaust pressure stabilizing mechanism to move upward. At this time, the exhaust port 24 opens and the compressed gas in the compression chamber is discharged.

[0060] The center positions of the active scroll disk and the driven scroll disk differ by a rotation dimension R. The driven scroll disk is driven to rotate by four eccentric small shafts on the active scroll disk.

[0061] The active scroll disk includes double-toothed variable cross-section scroll teeth, four eccentric small shaft bearing holes, and a main shaft bearing hole. The driven scroll disk includes double-toothed variable cross-section scroll teeth, four eccentric small shaft bearing holes, and an exhaust pipe. The active scroll disk and the driven scroll disk form an intake chamber, a compression chamber, and an exhaust chamber through the meshing of the variable cross-section scroll teeth. The eccentric small shaft bearing holes are located at the edges of the main and driven scroll disks and do not interfere with the scroll teeth.

[0062] The exhaust pressure stabilizing structure includes an exhaust valve body 27, an exhaust piston 28, and an exhaust valve cover 23, with an exhaust port 20 for discharging compressed gas at the exhaust valve cover.

[0063] When the exhaust piston is pushed up to different heights by the gas, the exhaust port opens sequentially according to the position of the exhaust piston, so that the compressed gas in the compression chamber is discharged from the exhaust port to the buffer chamber 12 of the gas buffer chamber. When the exhaust piston is in a low position, the exhaust port is closed.

[0064] The exhaust pipe of the driven scroll disk exhaust shaft is circular and located in the middle of the driven scroll disk;

[0065] The exhaust pipe 14 of the air compressor is connected to the frame through a bearing. There is an exhaust spring plate on the outside of the exhaust pipe. The outlet exhaust pressure of the air compressor is changed by adjusting the preload of the exhaust spring plate. The spring plate is located in the middle of the gas buffer chamber.

[0066] The exhaust valve body 27 is connected to the exhaust shaft end cover; the exhaust valve cover is disposed on the exhaust valve body and the exhaust hole is disposed on the exhaust valve body and communicates with the driven disk exhaust shaft; the flange base 26 of the exhaust valve body is fixed to the end cover of the driven disk exhaust shaft 11 of the passive scroll disk, the flange base is disposed on the bearing part of the exhaust valve body, and the exhaust hole is located on the bearing part;

[0067] The exhaust valve body includes a support part and a sealing part. The exhaust piston 28 abuts against the slide rail 29 on the inner wall of the exhaust valve body to form a sliding friction pair. The inner wall of the support part and the exhaust valve shell are provided with exhaust holes at corresponding positions, and the exhaust valve shell is also provided with a pressure relief window at the top of the exhaust hole.

[0068] When the gas pressure in the compression chamber pushes the piston to move along the slide rail to the exhaust height, the driven disc exhaust shaft starts to automatically exhaust gas. When the gas pressure is low, the exhaust piston automatically falls to stop exhausting gas.

[0069] The permanent magnet motor includes a rotor 3, a stator 6, a sheath 5, and windings. The power of the permanent magnet motor is transmitted to the active scroll plate through the drive shaft.

[0070] The drive shaft is a hollow structure with bolt components installed inside for fixing the drive scroll plate to the drive shaft. The drive shaft is fixed inside the air compressor frame by bearings, and a disc spring and thrust structure are installed at the bottom of the drive shaft.

[0071] The back of the gas buffer chamber is designed with an annular heat dissipation channel, and the motor housing 16 of the permanent magnet motor is designed with an arc-shaped heat dissipation channel. The annular heat dissipation channel and the arc-shaped heat dissipation channel form an integrated water cooling channel 17. The water cooling channel is spirally arranged upward at equal intervals from the permanent magnet motor, and heat dissipation is achieved through the flow of cooling water in the water cooling channel.

[0072] The exhaust port adopts a tapered exhaust port with gradually increasing exhaust diameter to reduce gas flow rate and reduce flow noise. The driven disk exhaust shaft is located between the exhaust port of the driven scroll disk and the exhaust pressure stabilizing mechanism. The diameter of the exhaust shaft is larger than that of the exhaust port. A large-diameter circumferential exhaust shaft is adopted to reduce gas flow rate and reduce flow noise.

[0073] A sound-absorbing plate 13 is installed between the buffer chamber of the gas buffer chamber and the upper end cover of the exhaust valve body to reduce exhaust noise;

[0074] The exhaust valve cover is a pressure-stabilizing exhaust valve cover, including an exhaust hole, a pressure relief window 18, and a limiting mechanism; the pressure relief window is located on the top side of the pressure-stabilizing exhaust valve cover, and the pressure relief window is used to relieve pressure to prevent the gas pressure inside the exhaust valve from being too high;

[0075] The pressure-stabilizing exhaust valve cover includes a connecting part and a limiting block 19. The limiting block is matched with the exhaust piston to prevent the pressure relief window from opening frequently.

[0076] The driven scroll plate has multiple exhaust holes, which are arranged at equal intervals. Both the flange base bearing part and the pressure stabilizing exhaust valve cover have exhaust holes. When the piston is subjected to gas force and moves upward along the slide rail, the circulating medium is discharged from the exhaust holes.

[0077] Both the active and driven scroll disks are provided with reinforcing ribs on their back sides. The reinforcing ribs are radially distributed from the center of the scroll disk to the edge and their height gradually decreases.

[0078] The variable cross-section vortex teeth of the active and driven vortex disks are designed with a sealing concave groove structure. A sealing strip is installed inside the concave groove to seal the gas. The tooth wall of the vortex teeth is coated with a wear-resistant and high-temperature resistant coating.

[0079] The tooth profile generatrix of the variable cross-section vortex tooth is a variable diameter base circle involute, the vortex tooth head is corrected by a single circular arc, and the vortex tooth tail is designed with a buffer-shaped flow guide structure.

[0080] The coaxial double-tooth variable cross-section scroll tooth includes a first active scroll tooth and a second active scroll tooth. The meshing profile of the first active scroll tooth includes four smoothly connected curves, which are, in order: the equidistant curve ab of the first variable diameter base circle involute, the equidistant curve ac of the first circular involute, the equidistant curve bd of the second circular involute, and the equidistant curve cd of the second variable diameter base circle involute. The moving scroll tooth profile and the stationary scroll tooth profile achieve complete and correct meshing. The thickness of the scroll tooth gradually increases from the outer ring to the center, with the outermost scroll tooth having the smallest thickness and the center of the scroll tooth having the largest thickness.

[0081] A design method for a coaxial high-speed scroll air compressor, used to design the tooth profile of the variable cross-section scroll gears described above, is characterized by comprising the following steps:

[0082] Step S1: Draw the base circle with radius R. b1 The coefficient of diameter is x, and the involute development angle is phi. e The variable-diameter base circle generatrix curve A1;

[0083] Step S2: Rotate the variable diameter base circle generatrix curve A1 by 90°, 180°, and 270° respectively to obtain the variable diameter base circle curves B1, C1, and D1;

[0084] Step S3, the generation process of the first active vortex tooth and the second active vortex tooth is the same. In the generation process of the first active vortex tooth, the lines A2 and A3 are obtained by using the normal equidistant method with the eccentric distance as the normal distance, where A2 and A3 are conjugate profiles; the base circle generatrix A1 is deleted, the inner profile D2 of D1 is modified for the tail end of the vortex tooth, and the outer profile A3 of the base circle generatrix A1 and the inner profile D2 of D1 are used as tooth profiles to generate the vortex tooth.

[0085] Example 1:

[0086] The parameters of the air compressor in this example are shown in the table below:

[0087] Table 1

[0088]

[0089] like Figure 1 As shown, this embodiment provides a coaxial high-speed scroll air compressor. The coaxial high-speed scroll air compressor draws in external gas through the meshing of the active scroll plate and the passive scroll plate. The gas is gradually drawn into the compression chamber from the air inlet. As the compression chamber gradually closes, its closed volume gradually shifts towards the center of the scroll plate and continuously contracts. After the gas is continuously compressed, the pressure gradually rises until the pressure reaches the exhaust gas pressure, which pushes the piston of the pressure stabilizing exhaust mechanism to move upward. At this time, the exhaust port opens and the circulating medium in the compression chamber is discharged.

[0090] This embodiment uses a permanent magnet motor to drive the drive shaft and drive scroll plate to rotate synchronously. Torque is transmitted to the driven scroll plate via an eccentric small shaft. Gas is drawn in through the meshing of the scroll plates and compressed in a crescent-shaped compression chamber formed by the meshing of the scroll teeth. Finally, the compressed gas is discharged through a pressure-stabilizing exhaust device. Because a sound-absorbing plate is installed between the buffer chamber and the upper cover, exhaust noise is reduced to a certain extent, providing a better user experience. Furthermore, this embodiment creatively proposes a coaxial double-tooth variable cross-section scroll tooth design, effectively replacing the existing dynamic and static scroll plate design of scroll air compressors, solving the problem of air compressor malfunction caused by scroll tooth interference during operation. The pressure-stabilizing exhaust mechanism design in this embodiment effectively reduces exhaust pressure fluctuations, is simple in structure and reliable in operation, ensuring both user comfort and economic efficiency, making it suitable for the air compressor field.

[0091] In this example, as Figure 1 As shown in this embodiment, the drive shaft is fixed to the drive scroll plate by bolts and fixed inside the frame by bearings. The drive shaft is axially positioned by the bottom disc spring and thrust structure to ensure that the spindle can work stably at high speeds.

[0092] In this example, by setting up a hollow drive shaft and an eccentric small shaft power transmission system, the eccentric main shaft design of the existing scroll air compressor is effectively replaced. There is no need to match and check the eccentric balance block on the main shaft. While ensuring the reliability of scroll gear meshing, it also ensures the stability of drive shaft rotation, greatly reducing the probability of resonance. In addition, the hollow main shaft design can effectively dissipate some heat.

[0093] like Figure 1 As shown in the embodiment, in this embodiment, reinforcing ribs are provided on the back of both the active and driven scroll disks. The reinforcing ribs are distributed radially from the center of the scroll disk to the edge, and the height gradually decreases.

[0094] By setting an annular reinforcing rib on the back of the scroll plate, the strength of the scroll plate is effectively improved, enabling the scroll plate to withstand higher rotational speeds and increasing the intake volume.

[0095] like Figure 2 As shown in the embodiment, both the active and driven scroll disks further include a sealing structure, which ensures the sealing of the compression chamber while also guaranteeing the reliable operation of the scroll teeth. This design ensures the airtightness of the compression chamber and reduces wear on the scroll teeth caused by heat deformation, facilitating subsequent installation and replacement of the sealing strip.

[0096] like Figure 1 As shown in the embodiment, in this embodiment, a cylindrical exhaust shaft is also provided between the exhaust port of the driven scroll disk and the pressure stabilizing exhaust mechanism, and the diameter of the exhaust shaft is larger than that of the exhaust port.

[0097] By setting a large-diameter circumferential exhaust shaft at the exhaust port, aerodynamic noise is reduced by expanding the volume, and the flow noise is reduced by reducing the flow velocity of the flowing medium.

[0098] like Figure 1 As shown in this embodiment, an integrated water-cooling channel is provided inside the frame and motor housing, with the water-cooling channel spiraling upwards at equal intervals from the motor. This reduces the overall weight of the air compressor and allows the air compressor to maintain a low temperature even under high load operation.

[0099] It should be noted that, in order to facilitate the demonstration of the generation process of the coaxial double-tooth variable cross-section vortex tooth, the process is shown from... Figures 3 to 8 The change process and the structural parameters of the designed vortex disk are shown in Table 1.

[0100] in Figure 3 It shows a base circle radius of R b1 The coefficient of diameter is x, and the involute development angle is phi. e The process of generating the variable-diameter base circle generatrix curve A1;

[0101] Figure 4 and Figure 5 As a group, Figure 4 It shows Figure 3 The process of rotating 180° to generate the variable diameter base circle curve B1;

[0102] Figure 5 It shows Figure 3 The process of generating variable diameter base circle curves C1 and D1 by rotating 90° and 270° respectively;

[0103] Taking the generation of the first active vortex tooth as an example, Figure 6 The process of generating conjugate profiles A2 and A3 using the normal equidistant method is shown. Figure 7 The process of generating a smooth curve D by correcting the tail end of the vortex tooth is shown; Figure 8 The process of generating vortex teeth by modifying a single circular arc tooth head is shown.

[0104] This example demonstrates how a novel variable cross-section vortex tooth generation method can be creatively proposed, which effectively improves the smoothness of vortex tooth meshing and significantly increases the compression efficiency of the compression chamber.

[0105] It is worth noting that in existing scroll air compressors, the stationary scroll plate remains stationary during operation, while the active scroll plate is driven by the eccentric main shaft to compress the gas in the compression chamber. This eccentric main shaft structure design limits the speed of the scroll air compressor. As the performance requirements of air compressors continue to increase, the danger and limitations of the eccentric main shaft at high speeds become more significant. In contrast, the coaxial double-tooth variable cross-section scroll gear proposed in this embodiment is a structural redesign that solves the problem of scroll gear limitations hindering the high-speed development of scroll compressors.

[0106] The coaxial high-speed scroll air compressor proposed in this embodiment does not require matching and checking eccentric balance blocks on the main shaft during use. It changes the eccentric motion of the traditional scroll plate to rotational motion, thereby increasing the speed of the scroll air compressor and conforming to the development trend of high-speed air compressors.

[0107] like Figure 10 and Figure 11 As shown, this embodiment also provides a pressure-stabilizing exhaust mechanism. The pressure-stabilizing exhaust valve includes an exhaust valve cover, an exhaust valve body, and a piston. The exhaust port is located on the exhaust valve body and communicates with the exhaust shaft of the driven disc, and the exhaust port diameter gradually increases. The exhaust valve body includes a bearing part and a sealing part. The piston abuts against the slide rail on the inner wall of the exhaust valve body to form a sliding friction pair. The inner wall of the bearing part and the exhaust valve body are provided with exhaust holes at corresponding positions, and the exhaust valve body is also provided with a pressure relief window at the top of the exhaust hole.

[0108] It is worth noting that in existing scroll air compressors, the exhaust valve plate is repeatedly impacted by the limit switch under the action of high-pressure gas during operation. This causes the limit switch to be continuously subjected to stress impact, which can easily lead to deformation and failure, reducing the service life of the exhaust valve plate and the overall reliability of the air compressor. At the same time, as air compressors continue to increase in speed, the load and frequency of impact on the exhaust valve plate will further increase in the future, and the requirements for the fatigue resistance and impact resistance of the exhaust valve plate will be significantly improved. The pressure-stabilizing exhaust valve proposed in this embodiment is structurally redesigned. By setting a conical exhaust port, the gas flow velocity can be effectively reduced, and the flow noise can be reduced. By indirectly controlling the opening area of ​​the exhaust port by the piston rise height, the exhaust pressure fluctuation can be effectively reduced.

[0109] This embodiment provides a scroll air compressor based on a coaxial double-tooth variable cross-section scroll gear design. The scroll air compressor transmits the power of the permanent magnet motor to the drive disc through the drive shaft (main shaft). The driven disc rotates through four eccentric small shafts on the drive disc. Gas is drawn in through the movement of the scroll disc, compressed through the meshing of the scroll teeth, and discharged through the exhaust pressure stabilization structure.

[0110] The coaxial high-speed scroll air compressor includes a permanent magnet motor, which is fixed to the drive shaft by a key connection. The permanent magnet motor is used to generate torque, which is transmitted to the drive scroll plate through the drive shaft. The main shaft is radially fixed inside the frame by bearings.

[0111] The coaxial high-speed scroll air compressor includes a power transmission system. The drive shaft and the drive scroll are fixed by bolts and connected by a key, which transmits the torque of the permanent magnet motor to the drive scroll. The drive scroll then transmits the torque to the driven scroll through an eccentric small shaft.

[0112] The coaxial high-speed scroll air compressor also includes a compression chamber, through which the gas is compressed into high-pressure gas and then discharged through a pressure-stabilizing exhaust structure.

[0113] The compression chamber includes an active scroll disk, four eccentric small shaft bearing holes, and a main shaft bearing hole. The active scroll disk receives the torque transmitted by the active shaft and rotates. The eccentric small shaft bearing holes are located at the edge of the active scroll disk and do not interfere with the scroll teeth.

[0114] The compression chamber also includes a driven scroll disk, four eccentric small shaft bearing holes, and an exhaust pipe. The driven scroll disk receives the torque transmitted by the driving disk through the eccentric small shaft, and forms an intake chamber, a compression chamber, and an exhaust chamber by meshing with the driving scroll disk through the variable cross-section scroll teeth. The eccentric small shaft bearing holes are located at the edge of the driven scroll disk and do not interfere with the scroll teeth.

[0115] The coaxial high-speed scroll air compressor includes variable cross-section scroll teeth. The head of the variable cross-section scroll teeth is corrected with a single circular arc, and the tail of the scroll teeth is designed with a buffer guide structure. The profiles of the moving scroll teeth and the static scroll teeth mesh perfectly. The thickness of the scroll teeth gradually increases from the outer ring to the center.

[0116] The variable cross-section vortex tooth also includes a sealing structure and high-temperature resistance measures. The top of the variable cross-section vortex tooth is designed with a sealing groove structure, and a sealing strip is installed inside the concave groove to seal the gas. The vortex tooth wall is coated with a wear-resistant and high-temperature resistant coating to reduce the thermal deformation of the vortex tooth.

[0117] The coaxial high-speed scroll air compressor also includes a heat dissipation design. By arranging cooling water channels on the back of the gas buffer chamber and inside the motor housing, cooling water removes most of the heat, preventing the air compressor's operating environment temperature from becoming too high. According to another aspect of this embodiment, a piston-based pressure-stabilizing exhaust valve is provided to address the problems of mechanical noise and low reliability caused by exhaust valve plates in existing air compressors during exhaust. To solve the above problems, this embodiment provides a pressure-stabilizing exhaust mechanism. This mechanism connects to the air compressor buffer chamber and controls the opening and closing of the exhaust port. The pressure-stabilizing exhaust mechanism includes an exhaust valve body, an exhaust valve shell, and a piston. When the piston is subjected to gas pressure, it slides upward along the slide rail until the exhaust port opens, and the medium flowing in the compression chamber is discharged. When the gas pressure is low, the piston falls, and the exhaust port closes.

[0118] The exhaust valve body includes a flange base, and the exhaust valve body and the exhaust port are connected by a flange to seal the compression chamber.

[0119] The flange base includes a sealing part and a bearing part. The flange base is connected to the exhaust shaft end cover by bolts. The exhaust port is set on the sealing part. The exhaust port of the exhaust valve is connected to the exhaust port of the exhaust shaft. The medium flowing in the compression chamber flows into the pressure stabilizing exhaust valve through the exhaust port.

[0120] The inner wall of the exhaust valve body is provided with four slide rails, which are equidistantly distributed and abut against the piston to form a sliding friction pair, so that the piston maintains stable movement.

[0121] The exhaust port, which connects the exhaust valve body to the exhaust shaft, is tapered and enlarged, which can effectively reduce the flow velocity of the circulating medium and reduce flow noise.

[0122] The exhaust valve body also has an exhaust port at the corresponding position, and a pressure relief window is provided above the exhaust port to prevent the gas pressure from being too high and unable to be discharged in time.

[0123] A limit mechanism is provided on the top of the exhaust valve housing. When the pressure in the compression chamber is insufficient to push the piston open the limit block, the pressure relief window is closed, and the medium flowing in the exhaust valve cannot flow out from the pressure relief window.

[0124] The pressure-stabilizing exhaust valve controls the piston's movement by regulating the flow of the medium discharged from the compression chamber. This piston movement opens and closes the exhaust port, automatically initiating exhaust whenever the gas pressure in the compression chamber pushes the piston along the slide rail to the exhaust height. When the gas pressure is low, the piston falls and automatically stops exhausting. This effectively replaces the existing exhaust valve plate structure for controlling the exhaust stroke of the compression chamber. It also features a pressure relief window; when the gas pressure in the compression chamber is too high, the piston pushes open the limit mechanism, causing the pressure relief window to open and allowing gas to escape rapidly. The pressure-stabilizing exhaust valve's structure avoids the deformation issues of existing exhaust valve plates under high-frequency impacts, significantly improving the valve's reliability. It reduces gas flow noise during compressor operation, offering a simple and reliable structure, a comfortable user experience, and low cost.

[0125] Existing traditional oil-free scroll air compressors have limitations in flow rate and speed due to their eccentric main shaft structure, with speeds generally ranging from 3000 to 4000 r / min. This example presents a coaxial high-speed scroll air compressor with a central shaft structure and a variable cross-section scroll gear design, achieving a rated speed of up to 10000 r / min, meeting the requirements for high flow rate, high speed, and low pressure fluctuation. Furthermore, this invention incorporates a buffer guide structure at the tail end of the scroll gears, effectively reducing the probability of interference and engagement failure during scroll gear meshing, thus significantly improving the compressor's performance. The stability and efficiency are improved, and the specific performance parameters are shown in Appendix Table 1. At the same time, the present invention has heat dissipation channels designed on the back of the gas buffer chamber and inside the motor housing, and the tooth wall of the vortex tooth is coated with a high temperature resistant coating, which effectively reduces the possibility of failure caused by thermal deformation of the internal structure of the air compressor, such as the vortex tooth. A pressure stabilizing exhaust mechanism is set at the exhaust end cover. When the vortex tooth meshes and compresses the gas in the compression chamber, the pressure in the compression chamber reaches a certain level, which will drive the piston to move for automatic exhaust. After the exhaust process is completed, the piston automatically falls back to the starting position.

[0126] In summary, this embodiment provides a design method for a coaxial high-speed scroll air compressor and its exhaust pressure stabilizing structure. In this embodiment, a permanent magnet motor drives the drive shaft and the drive scroll plate to rotate synchronously. During this process, torque is transmitted from the eccentric small shaft to the driven scroll plate. Gas is drawn in through the meshing of the scroll plates, and the dynamic crescent-shaped compression chamber formed by the meshing of the scroll teeth achieves efficient compression of the inhaled gas. After compression, the gas exerts an upward thrust on the piston through the exhaust port, causing the piston to open and close the exhaust valve's exhaust port. This ensures that automatic exhaust begins whenever the gas pressure in the compression chamber pushes the piston to the exhaust height along the slide rail. When the body pressure is low, the piston automatically stops exhausting as it falls, effectively replacing the existing exhaust valve plate structure to control the exhaust stroke of the compression chamber. The coaxial double-tooth variable cross-section scroll gear design method proposed in this embodiment can effectively increase the speed of the scroll air compressor, reduce the probability of scroll gear interference, and closely align with the development trend of high-speed scroll air compressors. This embodiment can significantly reduce the heat generated during the operation of the scroll air compressor, reduce the thermal deformation of the scroll gear, and improve the operational reliability of the air compressor. This embodiment can effectively increase the operating speed of the scroll air compressor, eliminates the need for matching and checking eccentric balance blocks on the main shaft, has a simple structure, is reliable in operation, and is easy to install, making it suitable for the air compressor field.

Claims

1. A coaxial high-speed scroll air compressor, characterized in that: It includes a compression chamber, a permanent magnet motor, a power transmission system, and an exhaust pressure stabilizing structure; the compression chamber includes an active scroll plate (8) and a driven scroll plate (10), and the permanent magnet motor (7) drives the active scroll plate to rotate through the active shaft (2); the active scroll plate is provided with multiple eccentric small shafts (9) for driving the driven scroll plate to rotate; the active scroll plate and the driven scroll plate are arranged opposite each other and mesh with the coaxial double teeth of the variable cross section scroll plates at their opposite disk surfaces. When the active scroll plate and the driven scroll plate rotate, gas is drawn in from the meshing area of ​​the scroll teeth between the two disks. The gas is compressed through the meshing process of the variable cross section scroll teeth to improve the meshing smoothness and increase the compression efficiency. The compressed gas is then discharged through the exhaust pressure stabilizing structure. When the coaxial high-speed scroll air compressor is working, the gas is drawn in, compressed and discharged through the movement of two scroll plates. Specifically, the external gas is gradually drawn into the compression chamber through the meshing of the active scroll plate and the driven scroll plate. The gas is compressed by the crescent-shaped compression chamber formed by the meshing of the scroll teeth. As the compression chamber gradually closes, its closed volume gradually shifts towards the center of the scroll plate and continuously shrinks. After the gas is continuously compressed, the pressure gradually rises until the pressure reaches the exhaust gas pressure, which pushes the exhaust piston (28) of the exhaust pressure stabilizing structure to move upward. At this time, the exhaust port (20) opens and the compressed gas in the compression chamber is discharged. The difference in rotational dimension between the center positions of the active and driven scroll disks R The driven scroll disk is driven to rotate by four eccentric small shafts on the active scroll disk; The active scroll disk includes double-toothed variable cross-section scroll teeth, four eccentric small shaft bearing holes, and a main shaft bearing hole. The driven scroll disk includes double-toothed variable cross-section scroll teeth, four eccentric small shaft bearing holes, and an exhaust pipe. The active scroll disk and the driven scroll disk form an intake chamber, a compression chamber, and an exhaust chamber through the meshing of the variable cross-section scroll teeth. The eccentric small shaft bearing holes are located at the edges of the main and driven scroll disks and do not interfere with the scroll teeth. The exhaust pressure stabilizing structure includes an exhaust valve body (27), an exhaust piston (28), and an exhaust valve cover (23), with an exhaust port (20) for discharging compressed gas at the exhaust valve cover. When the exhaust piston is pushed up to different heights by the gas, the exhaust port opens sequentially according to the position of the exhaust piston, so that the compressed gas in the compression chamber is discharged from the exhaust port to the buffer chamber (12) of the gas buffer chamber. When the exhaust piston is in a low position, the exhaust port is closed. The exhaust pipe (14) of the air compressor is connected to the frame through a bearing. There is an exhaust spring plate on the outside of the exhaust pipe. The outlet exhaust pressure of the air compressor is changed by adjusting the pre-pressure of the exhaust spring plate. The exhaust spring plate is located in the middle of the gas buffer chamber.

2. The coaxial high-speed scroll air compressor according to claim 1, characterized in that: The exhaust valve body (27) is connected to the end cover of the driven disk exhaust shaft; the exhaust pipe of the driven disk exhaust shaft is circular and located in the middle of the driven scroll disk; The exhaust valve cover is disposed on the exhaust valve body; the exhaust hole is disposed on the exhaust valve body and communicates with the driven disk exhaust shaft; the flange base (26) of the exhaust valve body is fixed to the end cover of the driven disk exhaust shaft (11) of the driven scroll disk, the flange base is disposed on the bearing part of the exhaust valve body, and the exhaust hole is located on the bearing part; The exhaust valve body includes a support part and a sealing part. The exhaust piston (28) abuts against the slide rail (29) on the inner wall of the exhaust valve body to form a sliding friction pair. The inner wall of the support part and the exhaust valve shell are provided with exhaust holes at corresponding positions. The exhaust valve shell is also provided with a pressure relief window at the top of the exhaust hole. When the gas pressure in the compression chamber pushes the piston to move along the slide rail to the exhaust height, the driven disc exhaust shaft starts to automatically exhaust gas. When the gas pressure is low, the exhaust piston automatically falls to stop exhausting gas.

3. A coaxial high-speed scroll air compressor according to claim 1, characterized in that: The permanent magnet motor includes a rotor (3), a stator (6), a sheath (5), and windings. The power of the permanent magnet motor is transmitted to the active scroll plate through the drive shaft. The drive shaft is a hollow structure with bolt components installed inside for fixing the drive scroll plate to the drive shaft. The drive shaft is fixed inside the air compressor frame by bearings, and a disc spring and thrust structure are installed at the bottom of the drive shaft. The back of the gas buffer chamber is designed with an annular heat dissipation channel, and the motor housing (16) of the permanent magnet motor is designed with an arc-shaped heat dissipation channel. The annular heat dissipation channel and the arc-shaped heat dissipation channel form an integrated water cooling channel (17). The water cooling channel is arranged spirally and equidistantly upward from the permanent magnet motor, and heat is dissipated through the flow of cooling water in the water cooling channel.

4. A coaxial high-speed scroll air compressor according to claim 1, characterized in that: The exhaust port adopts a tapered exhaust port with gradually increasing exhaust diameter to reduce gas flow rate and reduce flow noise. The driven disk exhaust shaft is located between the exhaust port of the driven scroll disk and the exhaust pressure stabilizing structure. The diameter of the exhaust shaft is larger than that of the exhaust port. A large-diameter circumferential exhaust shaft is adopted to reduce gas flow rate and reduce flow noise. A sound-absorbing plate (13) is installed between the buffer chamber of the gas buffer chamber and the upper end cover of the exhaust valve body to reduce exhaust noise; The exhaust valve cover is a pressure-stabilizing exhaust valve cover, including an exhaust port, a pressure relief window, and a limiting mechanism; the pressure relief window is located on the top side of the pressure-stabilizing exhaust valve cover, and the pressure relief window is used to relieve pressure to prevent the gas pressure inside the exhaust valve from being too high; The pressure-stabilizing exhaust valve cover includes a connecting part and a limiting block. The limiting block is matched with the exhaust piston to prevent the pressure relief window from opening frequently. The driven scroll plate has multiple exhaust holes, which are arranged at equal intervals. The bearing part of the flange base and the pressure stabilizing exhaust valve cover both have exhaust holes. When the piston is subjected to gas force and moves upward along the slide rail, the circulating medium is discharged from the exhaust holes.

5. A coaxial high-speed scroll air compressor according to claim 1, characterized in that: Both the active and driven scroll disks are provided with reinforcing ribs on their back sides. The reinforcing ribs are radially distributed from the center of the scroll disk to the edge and their height gradually decreases. The variable cross-section vortex teeth of the active and driven vortex disks are designed with a sealing concave groove structure. A sealing strip is installed inside the concave groove to seal the gas. The tooth wall of the vortex teeth is coated with a wear-resistant and high-temperature resistant coating.

6. A coaxial high-speed scroll air compressor according to claim 1, characterized in that: The tooth profile generatrix of the variable cross-section vortex tooth is a variable diameter base circle involute, the vortex tooth head is corrected by a single circular arc, and the vortex tooth tail is designed with a buffer-shaped flow guide structure. The coaxial double-tooth variable cross-section scroll tooth includes a first active scroll tooth and a second active scroll tooth. The meshing profile of the first active scroll tooth includes four smoothly connected curves, which are, in order: the equidistant curve ab of the first variable diameter base circle involute, the equidistant curve ac of the first circular involute, the equidistant curve bd of the second circular involute, and the equidistant curve cd of the second variable diameter base circle involute. The moving scroll tooth profile and the stationary scroll tooth profile achieve complete and correct meshing. The thickness of the scroll tooth gradually increases from the outer ring to the center, with the outermost scroll tooth having the smallest thickness and the center of the scroll tooth having the largest thickness.

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