Coaxial high-speed scroll air compressor and design method

Abstract

The invention provides a coaxial high-speed scroll air compressor and a design method. The coaxial high-speed scroll air compressor 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 plate (8) and a driven scroll plate, and the permanent magnet motor (7) drives the driving scroll plate to rotate through a driving shaft (2); a plurality of eccentric small shafts (9) for driving the driven plate to rotate are arranged at the driving scroll plate; the driving scroll plate and the driven scroll plate are oppositely arranged and are meshed through coaxial double-tooth variable cross-section scroll teeth on the opposite plate surfaces of the driving scroll plate and the driven scroll plate, when the driving scroll plate and the driven scroll plate rotate, gas is sucked in a scroll tooth meshing area between the driving scroll plate and the driven scroll plate, and the sucked gas is compressed through the meshing process of the variable cross-section scroll teeth. The meshing smoothness is improved, the compression efficiency is improved, and compressed gas is exhausted through the exhaust pressure stabilizing structure. According to the scroll air compressor, the problems of meshing failure and scroll wrap interference of the scroll air compressor in the prior art can be solved, and the operation stability of the scroll air compressor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, in particular to a coaxial high-speed scroll air compressor and a design method thereof. Background Art

[0002] As the core component of fuel cells, the performance of air compressors has a direct impact on the power density, efficiency and reliability of fuel cells. The scroll air compressor is an ideal choice for fuel cell gas supply due to its high efficiency, low noise and small size. Its pump body is mainly composed of a driving disk, a driven disk, a driving shaft, an eccentric small shaft and a sealed bearing. During the operation of the compressor, the motor drives the driving shaft to rotate, and then drives the driving disk to make a circular motion around the driving shaft. There is an eccentric distance between the driven disk and the driving disk, and the driven disk is driven to rotate through the eccentric small shaft. During the compression process, the gas enters from the air intake port and is gradually sucked into the outer crescent-shaped air cavity that is connected to the air intake cavity. As the crescent-shaped air cavity closes, its closed volume gradually transfers to the middle of the scroll disk and continues to shrink. The gas is continuously compressed until the pressure reaches the exhaust pressure. The gas in the compression chamber pushes open the exhaust valve on the exhaust port to start exhausting, completing a working cycle.

[0003] During the operation of existing air compressors, the exhaust valve plate that controls the opening and closing of the exhaust port repeatedly impacts the limit plate above it under the pressure of high-pressure gas, causing the limit plate to be subjected to greater impact and stress, which is prone to deformation or failure, reducing the life of the air compressor. With the development of air compressors, the speed and exhaust pressure will become higher and higher, and the impact load generated will also become larger and larger. The working environment of the exhaust valve plate will become more severe, and the impact resistance of the exhaust valve will be more stringent.

[0004] At present, domestic patents related to the problem of exhaust valve failure mainly reduce the stress on the exhaust valve by changing the shape design of the exhaust valve or adding a buffer device to the limit plate, thereby reducing the occurrence of failure. Most existing technical solutions rely on the exhaust valve to directly control the opening and closing of the exhaust port. However, since this process is extremely frequent, it not only causes a large mechanical noise problem, but also easily causes the exhaust valve to fail due to fatigue, and bend and deform. 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 study of scroll air compressor is not only because of its many advantages, but also because of its broad application prospects and potential for technological innovation.

[0006] The present invention is based on a self-rotating double-tooth variable-section vortex gear and an 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-section vortex gear generation method, which can effectively improve the suction volume and compression ratio of the air compressor, reduce the probability of vortex gear interference and meshing failure, and combine the exhaust pressure stabilizing structure to control the exhaust pressure fluctuation, effectively improving the operating stability of the air compressor. Summary of the invention

[0007] The present invention proposes a coaxial high-speed scroll air compressor and a design method, which can solve the meshing failure and scroll tooth interference problems that are prone to occur in scroll air compressors in the prior art, and improve the operating stability of the scroll air compressor.

[0008] The present invention adopts the following technical solutions.

[0009] A coaxial high-speed scroll air compressor comprises a compression chamber, a permanent magnet motor, a power transmission system and an exhaust pressure stabilizing structure; the compression chamber comprises an active scroll plate (8) and a driven scroll plate (10); the permanent magnet motor (7) drives the active scroll plate to rotate via a driving shaft (2); a plurality of eccentric small shafts (9) for driving the driven scroll plate to rotate are arranged at the active scroll plate; the active scroll plate and the driven scroll plate are arranged opposite to each other and meshed through the coaxial double-toothed variable-section scroll teeth on their relative disk surfaces; when the active scroll plate and the driven scroll plate rotate, the scroll tooth meshing area between the two disks inhales gas, and the inhaled gas is compressed through the meshing process of the variable-section scroll teeth to improve meshing smoothness and increase compression efficiency, and then the compressed gas is discharged through the exhaust pressure stabilizing structure.

[0010] When the coaxial high-speed scroll air compressor is working, the gas is sucked in, compressed and discharged through the movement of the two scroll plates. Specifically, the active scroll plate is meshed with the passive scroll plate, so that the external gas is gradually sucked into the compression chamber from the air inlet, and 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 moves to 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 pressure, pushing the exhaust piston (28) of the exhaust pressure stabilizing mechanism to move upward. At this time, the exhaust hole (24) is opened, and the compressed gas in the compression chamber is discharged.

[0011] The center positions of the active scroll and the driven scroll differ by a rotation dimension R, and the driven scroll is driven to rotate by the four eccentric small shafts on the active scroll;

[0012] The active scroll plate includes a double-toothed variable-section scroll tooth, four eccentric small shaft bearing holes, and a main shaft bearing hole. The driven scroll plate includes a double-toothed variable-section scroll tooth, four eccentric small shaft bearing holes, and an exhaust duct. The active scroll plate and the driven scroll plate are meshed with the variable-section scroll teeth to form an intake chamber, a compression chamber, and an exhaust chamber. The eccentric small shaft bearing hole is located at the edge of the active and driven scroll plates and does not interfere with the scroll teeth.

[0013] The exhaust pressure stabilizing structure comprises an exhaust valve body (27), an exhaust piston (28), and an exhaust valve cover (23), wherein the exhaust valve cover is provided with an exhaust hole (20) for exhausting compressed gas;

[0014] When the exhaust piston is pushed up to different heights by the gas, the exhaust holes are opened in sequence according to the different positions of the exhaust piston, so that the compressed gas in the compression chamber is discharged from the exhaust holes to the buffer chamber (12) of the gas buffer chamber. When the exhaust piston is at a low position, the exhaust holes are closed.

[0015] The exhaust pipe of the exhaust shaft of the driven scroll 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 via a bearing. An exhaust spring sheet is arranged outside the exhaust pipe. The outlet exhaust pressure of the air compressor is changed by adjusting the pre-pressure of the exhaust spring sheet. The spring sheet is located in the middle of the gas buffer chamber.

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

[0018] The exhaust valve body comprises a bearing portion and a sealing portion, and the exhaust piston (28) abuts against a slide rail (29) on the inner wall of the exhaust valve body to form a sliding friction pair; exhaust holes are provided at corresponding positions of the inner wall of the bearing portion and the exhaust valve shell, and the exhaust valve shell is also provided with a pressure relief window at the top of the exhaust hole;

[0019] When the gas pressure in the compression chamber pushes the piston to move along the slide rail to the exhaust height, the exhaust shaft of the driven disk starts to exhaust automatically. When the gas pressure is low, the exhaust piston automatically falls to stop exhausting.

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

[0021] The driving shaft is a hollow structure, and a bolt component is installed inside the hollow structure to fix the active scroll plate on the driving shaft. The driving shaft is fixed inside the air compressor frame through a bearing, and a butterfly spring and a thrust structure are installed at the bottom of the driving shaft;

[0022] The back of the gas buffer chamber is designed with a circular heat dissipation water channel, and the motor housing (16) of the permanent magnet motor is designed with an arc-shaped heat dissipation water channel. The circular heat dissipation water channel and the arc-shaped heat dissipation water channel form an integrated water cooling channel (17). The water cooling channel is arranged equidistantly upward in a spiral from the permanent magnet motor, and heat is dissipated by the flow of cooling water in the water cooling channel.

[0023] The exhaust hole adopts a conical exhaust port with a gradually increasing exhaust diameter to reduce the gas flow rate and reduce the circulation noise. The driven disk exhaust shaft is arranged between the exhaust port of the driven scroll disk and the exhaust pressure stabilizing mechanism. The diameter of the exhaust shaft is larger than the exhaust port. A large-diameter circumferential exhaust shaft is adopted to reduce the gas flow rate and reduce the circulation noise.

[0024] The exhaust valve cover is a pressure-stabilizing exhaust valve cover, including an exhaust hole, a pressure relief window and a limit 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 to relieve pressure 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, wherein the limiting block cooperates with the exhaust piston to prevent the pressure relief window from opening frequently;

[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 part and the pressure-stabilizing exhaust valve cover both have exhaust holes. When the piston moves upward along the slide rail under the force of the gas, the circulating medium is discharged from the exhaust holes.

[0027] A silencer 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 exhaust noise.

[0028] The backs of the active scroll and the driven scroll are both provided with reinforcing ribs, which are radiated from the center to the edge of the scroll and gradually decrease in height;

[0029] The variable-section scroll teeth of the active scroll and the driven scroll are designed with sealing concave groove structures at their tooth tops, and sealing strips are installed inside the concave grooves to seal the gas. The scroll tooth walls are coated with wear-resistant and high-temperature-resistant coatings.

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

[0031] The coaxial double-toothed variable-section vortex gear comprises a first active vortex gear and a second active vortex gear; the meshing profile of the first active vortex gear comprises four smoothly connected curves, which are: an equidistant curve ab of the first variable-diameter base circle involute, an equidistant curve ac of the first circle involute, an equidistant curve bd of the second circle involute and an equidistant curve cd of the second variable-diameter base circle involute; the movable vortex gear profile and the static vortex gear profile are fully and correctly meshed; the vortex gear thickness gradually increases from the outer ring to the center, the vortex gear thickness at the outermost part is the smallest, and the thickness at the center of the vortex gear is the largest.

[0032] The design method of a coaxial high-speed scroll air compressor is used to design the tooth shape of the variable cross-section scroll tooth mentioned above, and is characterized in that it includes the following steps:

[0033] Step S1: Draw a base circle with a radius of R b1 , the coefficient of change is x, and the involute angle is phi e The variable diameter base circle generatrix curve A1;

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

[0035] Step S3, the generation process of the first active scroll tooth and the second active scroll tooth is the same. In the generation process of the first active scroll tooth, the normal equidistance method is used to obtain lines A2 and A3 with the eccentric distance as the normal distance, wherein A2 and A3 are conjugate profiles; the base circle generatrix A1 is deleted, the inner profile D2 of D1 is corrected at the tail end of the scroll tooth, and the outer profile A3 of the base circle generatrix A1 and the inner profile D2 of D1 are used as the tooth profile lines to generate the scroll tooth.

[0036] The scheme of the present invention is based on a self-rotating double-tooth variable-section vortex gear and an 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-section vortex gear generation method, which can effectively improve the suction volume and compression ratio of the air compressor, reduce the probability of vortex gear interference and meshing failure, and combine with the exhaust pressure stabilizing structure to control exhaust pressure fluctuations, thereby effectively improving the operating stability of the air compressor.

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

[0038] The present invention is designed with a buffer guide structure at the tail end of the volute, which effectively reduces the probability of interference and meshing failure of the volute during the meshing process, and greatly improves the stability and efficiency of the air compressor.

[0039] The present invention is designed with heat dissipation water channels on the back of the gas buffer chamber and inside the motor housing, and a high-temperature resistant coating is applied on the tooth wall of the vortex gear, which effectively reduces the possibility of failure of the structures such as the vortex gear inside the air compressor due to thermal deformation; a pressure-stabilizing exhaust mechanism is arranged at the exhaust end cover, and when the vortex gear meshes to 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, and the piston automatically falls back to the starting position after the exhaust process is completed.

[0040] The present invention provides a silencer plate between the buffer chamber and the upper end cover, which reduces exhaust noise to a certain extent, so that users have a better experience during use.

[0041] The present invention creatively proposes a design of coaxial double-tooth variable-section vortex teeth, which effectively replaces the dynamic and static vortex disk designs of the existing vortex air compressor, and solves the problem that the air compressor cannot work normally due to interference between the vortex teeth during the operation of the air compressor; the design of the pressure-stabilizing exhaust mechanism of the present invention can effectively reduce the exhaust pressure fluctuation, has a simple structure and reliable operation, ensures that users enjoy a comfortable experience while being economical, and is suitable for use in the field of air compressors.

[0042] The present invention effectively replaces the eccentric main shaft design of the existing scroll air compressor by providing a hollow driving shaft and an eccentric small shaft power transmission system. There is no need to match and check the eccentric balance block on the main shaft. While ensuring the reliability of the scroll tooth meshing, the stability of the driving shaft rotation is also ensured, and the probability of resonance is greatly reduced. In addition, the design of the hollow main shaft can effectively take away some heat.

[0043] The present invention effectively improves the strength of the scroll disk by arranging an annular reinforcing rib on the back of the scroll disk, so that the scroll disk can withstand a higher rotation speed and the air intake volume is increased.

[0044] The present invention proposes a novel variable-section vortex gear generation method, which effectively improves the meshing smoothness of the vortex gear and significantly increases the compression efficiency of the compression chamber.

[0045] During operation of the existing scroll air compressor, the static scroll disk remains stationary, and the active scroll disk is driven by the eccentric main shaft to move, so that the gas in the compression chamber is compressed. The eccentric main shaft structure design limits the rotation speed of the scroll air compressor. As the performance requirements of the air compressor continue to increase, the dangers and limitations of the eccentric main shaft at high speeds become more significant. The coaxial double-tooth variable-section scroll tooth proposed in the present invention is structurally redesigned to solve the problem that the high-speed development of the scroll compressor is limited by the scroll tooth.

[0046] The coaxial high-speed scroll air compressor proposed by the present invention does not need to match and check the eccentric balance block on the main shaft during use. The eccentric motion of the traditional scroll disk is changed into self-rotation motion, which increases the rotation speed of the scroll air compressor and meets the development trend of high-speed air compressors.

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

[0048] The present invention provides a coaxial high-speed scroll air compressor and an exhaust pressure stabilizing structure design method. The present invention drives the active shaft and the active scroll plate to rotate synchronously through a permanent magnet motor. In this process, the torque is transmitted from the eccentric small shaft to the driven scroll plate; the scroll plates mesh with each other to inhale gas, and a dynamic crescent-shaped compression chamber formed by the meshing of scroll teeth is used to achieve efficient compression of the inhaled gas; after the gas is compressed, it passes through the exhaust port and exerts an upward thrust on the piston, and the exhaust hole of the exhaust valve is opened and closed by the movement of the piston, so that whenever the gas pressure in the compression chamber pushes the piston to move along the slide rail to the exhaust height, it will start to exhaust automatically. When the gas pressure is When the pressure is low, the piston automatically stops exhausting when it falls, effectively replacing the existing exhaust valve plate structure to control the exhaust stroke of the compression chamber; the coaxial double-tooth variable-section vortex tooth design method proposed in the present invention can effectively increase the rotation speed of the vortex air compressor, reduce the probability of vortex tooth interference, and highly conform to the development trend of high-speed vortex air compressors; the present invention can significantly reduce the heat generated during the operation of the vortex air compressor, reduce the thermal deformation of the vortex tooth, and improve the operating reliability of the air compressor; the present invention can effectively increase the operating speed of the vortex air compressor, and there is no need to match and check the eccentric balance block on the main shaft. It has a simple structure, reliable operation, and is easy to install, and is suitable for the field of air compressors. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0051] Attached Figure 2 A schematic diagram of the external structure of a coaxial double-tooth variable-section scroll tooth provided in an embodiment of the present invention;

[0052] Attached Figure 3 To Attachment Figure 8 A design process diagram of a coaxial double-tooth variable-section scroll gear provided in an embodiment of the present invention;

[0053] Attached Fig. 9A meshing profile diagram of a coaxial double-tooth variable-section scroll tooth provided in an embodiment of the present invention;

[0054] Attached Fig.10 A schematic diagram of the external structure of an exhaust valve assembly provided in an embodiment of the present invention;

[0055] Attached Fig.11 For attachment Figure 5 Schematic diagram of the internal structure of the exhaust valve;

[0056] In the figure: 1. bracket; 2. driving shaft; 3. rotor; 4. magnetic steel; 5. sleeve; 6. stator; 7. permanent magnet motor; 8. active scroll; 9. eccentric small shaft; 10. driven scroll; 11. driven scroll exhaust shaft; 12. buffer chamber; 13. silencer; 14. exhaust pipe; 15. upper end cover; 16. motor housing; 17. water cooling flow channel; 18. pressure relief window; 19. limit block; 20. exhaust hole; 21. exhaust valve cover end cover; 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 DESCRIPTION

[0057] Next, the technical solutions in the embodiments of the present invention will be fully and clearly explained with reference to the relevant drawings in the embodiments of the present invention. It should be noted that the presented embodiments are only a part of the many possible implementations of the present invention, not all. The following description of at least one representative embodiment is intended to illustrate rather than limit, and should never be regarded as any constraint on the present invention and its application or use. On this basis, any other implementations derived from these embodiments by those skilled in the art without involving creative work 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 8 and a driven scroll 10, and the permanent magnet motor 7 drives the active scroll to rotate through a driving shaft 2; a plurality of eccentric small shafts 9 for driving the driven scroll to rotate are provided at the active scroll; the active scroll and the driven scroll are arranged opposite to each other and meshed through the coaxial double-toothed variable-section scroll teeth on their relative disk surfaces, and when the active scroll and the driven scroll rotate, the scroll tooth meshing area between the two disks inhales gas, and the inhaled gas is compressed through the meshing process of the variable-section scroll teeth to improve the meshing smoothness and increase the compression efficiency, and then the compressed gas is discharged through the exhaust pressure stabilizing structure.

[0059] When the coaxial high-speed scroll air compressor is working, the gas is sucked in, compressed and discharged through the movement of the two scroll plates. Specifically, the active scroll plate is meshed with the passive scroll plate, so that the external gas is gradually sucked into the compression chamber from the air inlet, and 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 to 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 pressure, pushing the exhaust piston 28 of the exhaust pressure stabilizing mechanism to move upward. At this time, the exhaust hole 24 is opened, and the compressed gas in the compression chamber is discharged.

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

[0061] The active scroll plate includes a double-toothed variable-section scroll tooth, four eccentric small shaft bearing holes, and a main shaft bearing hole. The driven scroll plate includes a double-toothed variable-section scroll tooth, four eccentric small shaft bearing holes, and an exhaust duct. The active scroll plate and the driven scroll plate are meshed with the variable-section scroll teeth to form an intake chamber, a compression chamber, and an exhaust chamber. The eccentric small shaft bearing hole is located at the edge of the active and driven scroll plates and does 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. The exhaust valve cover is provided with an exhaust hole 20 for discharging compressed gas.

[0063] When the exhaust piston is pushed up to different heights by the gas, the exhaust holes are opened in sequence according to the different positions of the exhaust piston, so that the compressed gas in the compression chamber is discharged from the exhaust holes to the buffer chamber 12 of the gas buffer chamber. When the exhaust piston is at a low position, the exhaust holes are closed;

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

[0065] The exhaust pipe 14 of the air compressor is connected to the frame through a bearing. An exhaust spring sheet is arranged outside the exhaust pipe. The outlet exhaust pressure of the air compressor is changed by adjusting the pre-pressure of the exhaust spring sheet. The spring sheet 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 arranged on the exhaust valve body; the exhaust hole is arranged on the exhaust valve body and is connected to the exhaust shaft of the driven disk; the flange base 26 of the exhaust valve body is fixed to the end cover of the exhaust shaft 11 of the driven disk of the passive scroll disk, the flange base is arranged 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 bearing 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. Exhaust holes are provided at corresponding positions of the inner wall of the bearing part and the exhaust valve shell, 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 exhaust shaft of the driven disk starts to exhaust automatically. When the gas pressure is low, the exhaust piston automatically falls to stop exhausting.

[0069] The permanent magnet motor comprises a rotor 3, a stator 6, a sheath 5 and a winding of the motor, and the power of the permanent magnet motor is transmitted to the active scroll disk through the driving shaft;

[0070] The driving shaft is a hollow structure, and a bolt component is installed inside the hollow structure to fix the active scroll plate on the driving shaft. The driving shaft is fixed inside the air compressor frame through a bearing, and a butterfly spring and a thrust structure are installed at the bottom of the driving shaft;

[0071] A circular heat dissipation water channel is designed at the back of the gas buffer chamber, and an arc-shaped heat dissipation water channel is designed inside the motor shell 16 of the permanent magnet motor. The circular heat dissipation water channel and the arc-shaped heat dissipation water channel form an integrated water-cooling channel 17. The water-cooling channel is arranged equidistantly upward in a spiral from the permanent magnet motor, and heat is dissipated by the flow of cooling water in the water-cooling channel.

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

[0073] A silencer plate 13 is provided between the buffer chamber of the gas buffer cavity 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 and a pressure relief window 18 and a limit 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 to relieve pressure to prevent the gas pressure in the exhaust valve body from being too high;

[0075] The pressure-stabilizing exhaust valve cover comprises a connecting portion and a limit block 19, wherein the limit block cooperates with the exhaust piston to prevent the pressure relief window from opening frequently;

[0076] The number of exhaust holes of the driven scroll disk is multiple, and the multiple exhaust holes are arranged at equal intervals. The flange base bearing portion and the pressure-stabilizing exhaust valve cover both have exhaust holes. When the piston moves upward along the slide rail under the force of the gas, the circulating medium is discharged from the exhaust holes.

[0077] The backs of the active scroll and the driven scroll are both provided with reinforcing ribs, which are radiated from the center to the edge of the scroll and gradually decrease in height;

[0078] The variable-section scroll teeth of the active scroll and the driven scroll are designed with sealing concave groove structures at their tooth tops, and sealing strips are installed inside the concave grooves to seal the gas. The scroll tooth walls are coated with wear-resistant and high-temperature-resistant coatings.

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

[0080] The coaxial double-toothed variable-section vortex gear comprises a first active vortex gear and a second active vortex gear; the meshing profile of the first active vortex gear comprises four smoothly connected curves, which are: an equidistant curve ab of the first variable-diameter base circle involute, an equidistant curve ac of the first circle involute, an equidistant curve bd of the second circle involute and an equidistant curve cd of the second variable-diameter base circle involute; the movable vortex gear profile and the static vortex gear profile are fully and correctly meshed; the vortex gear thickness gradually increases from the outer ring to the center, the vortex gear thickness at the outermost part is the smallest, and the thickness at the center of the vortex gear is the largest.

[0081] The design method of a coaxial high-speed scroll air compressor is used to design the tooth shape of the variable cross-section scroll tooth mentioned above, and is characterized in that it includes the following steps:

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

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

[0084] Step S3, the generation process of the first active scroll tooth and the second active scroll tooth is the same. In the generation process of the first active scroll tooth, the normal equidistance method is used to obtain lines A2 and A3 with the eccentric distance as the normal distance, wherein A2 and A3 are conjugate profiles; the base circle generatrix A1 is deleted, the inner profile D2 of D1 is corrected at the tail end of the scroll tooth, and the outer profile A3 of the base circle generatrix A1 and the inner profile D2 of D1 are used as the tooth profile lines to generate the scroll tooth.

[0085] Embodiment 1:

[0086] The parameters of the air compressor in this example are as follows:

[0087] Table 1

[0088]

[0089] like Figure 1 As shown, this embodiment provides a coaxial high-speed scroll air compressor, which inhales external gas through the meshing of the active scroll plate and the passive scroll plate, and the gas is gradually sucked into the compression chamber from the air inlet. As the compression chamber gradually closes, its closed volume gradually moves toward 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 pressure, pushing the piston of the pressure-stabilizing exhaust mechanism to move upward, at which time the exhaust hole opens, and the circulating medium in the compression chamber is discharged;

[0090] In this embodiment, the active shaft and the active scroll disk are driven by a permanent magnet motor to rotate synchronously, the torque is transmitted to the driven scroll disk through the eccentric small shaft, the gas is sucked in through the mutual meshing of the scroll disks, and the gas is compressed by the crescent-shaped compression chamber formed by the mutual meshing of the scroll teeth, and finally the compressed gas is discharged through the pressure-stabilizing exhaust device; since a silencer plate is provided between the buffer chamber and the upper end cover in this embodiment, the exhaust noise is reduced to a certain extent, so that the user has a better experience during use; at the same time, this embodiment effectively replaces the dynamic and static scroll disk designs of the existing scroll air compressor by creatively proposing the design of coaxial double-tooth variable-section scroll teeth, and solves the problem that the air compressor cannot work normally due to the interference of the scroll teeth during the operation of the air compressor; the design of the pressure-stabilizing exhaust mechanism in this embodiment can effectively reduce the exhaust pressure fluctuation, the structure is simple and the operation is reliable, ensuring that users enjoy a comfortable experience while being economical, and is suitable for use in the field of air compressors.

[0091] In this example, if Figure 1 As shown, in the embodiment of this embodiment, the driving shaft is fixed to the active scroll plate by bolts and fixed to the inside of the frame by bearings. The driving shaft is axially positioned by the butterfly spring and thrust structure at the bottom to ensure that the main shaft can work stably at high speed.

[0092] In this example, by setting up a hollow driving 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 the scroll tooth meshing, the stability of the driving shaft rotation is also ensured, which greatly reduces the probability of resonance. In addition, the design of the hollow main shaft can effectively take away some heat.

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

[0094] By providing an annular reinforcing rib on the back of the scroll disk, the strength of the scroll disk is effectively improved, so that the scroll disk can withstand a higher rotation speed and the air intake volume is increased.

[0095] like Figure 2 As shown, in the embodiment of this embodiment, the active scroll and the driven scroll also include a sealing structure, which ensures the airtightness of the compression chamber while ensuring that the scroll teeth can work reliably. This arrangement not only ensures the airtightness of the compression chamber, but also reduces the wear of the scroll teeth caused by thermal deformation, making it easier to install and replace the sealing strip later.

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

[0097] By arranging a large-diameter circular exhaust shaft at the exhaust port, the aerodynamic noise is reduced by expanding the capacity, and the circulation noise is reduced by reducing the flow velocity of the circulating medium.

[0098] like Figure 1 As shown, in the embodiment of this embodiment, an integrated water cooling channel is set inside the frame and the motor housing, and the water cooling channel is arranged upward from the motor in a spiral with equal distances. This not only reduces the weight of the air compressor, but also allows the air compressor to maintain a lower temperature under high load operation.

[0099] It should be noted that in order to facilitate the display of the generation process of the coaxial double-tooth variable-section scroll gear, the Figures 3 to 8 The changing process of the designed scroll structure parameters are shown in Table 1;

[0100] in Figure 3 The base circle radius is shown as R b1 , the coefficient of change is x, and the involute 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 Shows Figure 3 The process of rotating 180° to generate the variable diameter base circle curve B1;

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

[0103] Taking the generation of the first active scroll tooth as an example, Figure 6 The process of generating conjugate lines A2 and A3 by the normal equidistance method is shown. Figure 7 The process of modifying the tail end of the scroll tooth to generate a smooth curve D is shown; Figure 8 The process of generating a spiral tooth by a single arc modified tooth head is shown.

[0104] In this example, a new variable-section vortex tooth generation method was creatively proposed, which effectively improved the meshing smoothness of the vortex teeth and significantly increased the compression efficiency of the compression chamber.

[0105] It is worth noting that: during the operation of the existing scroll air compressor, the static scroll disk remains stationary, and the active scroll disk is driven by the eccentric main shaft to move, so that the gas in the compression chamber is compressed. This eccentric main shaft structural design limits the rotation speed of the scroll air compressor. As the performance requirements of the air compressor continue to increase, the dangers and limitations of the eccentric main shaft at high speeds become more significant. The coaxial double-tooth variable-section scroll tooth proposed in this embodiment is structurally redesigned to solve the problem that the high-speed development of the scroll compressor is limited by the scroll tooth.

[0106] The coaxial high-speed scroll air compressor proposed in this embodiment does not need to match and check the eccentric balance block on the main shaft during use. The eccentric motion of the traditional scroll disk is changed to self-rotation motion, which increases the rotation speed of the scroll air compressor and meets the development trend of high-speed air compressors.

[0107] like Fig.10 and Fig.11 As shown, this embodiment also provides a pressure-stabilizing exhaust mechanism, and the pressure-stabilizing exhaust valve includes an exhaust valve cover, an exhaust valve body and a piston; the exhaust port is arranged on the exhaust valve body and is connected to 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, and the piston abuts against the sliding rail on the inner wall of the exhaust valve body to form a sliding friction pair; exhaust holes are provided at corresponding positions of the inner wall of the bearing part and the exhaust valve shell, and the exhaust valve shell is also provided with a pressure relief window at the top of the exhaust hole.

[0108] It is worth mentioning that during the operation of the existing scroll air compressor, the exhaust valve plate repeatedly impacts the limiter under the action of high-pressure gas, causing the limiter to continuously bear stress impact, which is prone to deformation and failure, reducing the service life of the exhaust valve plate and the reliability of the entire air compressor; at the same time, with the continuous speed of air compressors, 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, and by setting a conical exhaust port, the gas flow rate can be effectively reduced and the circulation noise can be reduced; the exhaust pressure fluctuation can be effectively reduced by indirectly controlling the opening area of ​​the exhaust hole by the rising height of the piston.

[0109] This embodiment provides a scroll air compressor based on a coaxial double-tooth variable-section scroll gear design. The scroll air compressor transmits the power of the permanent magnet motor to the active disk through the active shaft (main shaft), and the driven disk rotates through the four eccentric small shafts on the active disk. The gas is sucked in through the movement of the scroll disk, 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 fixedly rotated with the driving shaft through a key connection. The permanent magnet motor is used to generate torque, and the torque is transmitted to the active scroll plate through the driving shaft. The main shaft is radially fixed inside the frame through bearings.

[0111] The coaxial high-speed scroll air compressor includes a power transmission system, in which the driving shaft and the active scroll are fixed with bolts and connected with a key, and the torque of the permanent magnet motor is transmitted to the active scroll, and the active scroll 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, and the gas is compressed into high-pressure gas through the compression chamber and then discharged through the pressure-stabilizing exhaust structure.

[0113] The compression chamber includes an active scroll plate, four eccentric small shaft bearing holes, and a main shaft bearing hole. The active scroll plate receives the torque transmitted by the active shaft to rotate. The eccentric small shaft bearing hole is located at the edge of the active scroll plate and does not interfere with the scroll teeth.

[0114] The compression chamber also includes a driven scroll plate, four eccentric small shaft bearing holes, and an exhaust duct. The driven scroll plate receives the torque transmitted by the active scroll plate through the eccentric small shaft, and engages with the active scroll plate through the variable-section scroll teeth to form an intake chamber, a compression chamber, and an exhaust chamber. The eccentric small shaft bearing hole is located at the edge of the driven scroll plate and does not interfere with the scroll teeth.

[0115] The coaxial high-speed scroll air compressor includes a variable-section scroll tooth. The variable-section scroll tooth head is modified by a single arc. The scroll tooth tail is designed with a buffer guide structure. The dynamic scroll tooth profile and the static scroll tooth profile are completely and correctly meshed. The scroll tooth thickness gradually increases from the outer ring to the center.

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

[0117] The coaxial high-speed scroll air compressor also includes a heat dissipation design. By arranging heat dissipation water channels on the back of the gas buffer chamber and inside the motor housing, most of the heat is taken away by cooling water to prevent the working environment temperature of the air compressor from being too high. According to another aspect of this embodiment, a pressure-stabilizing exhaust valve based on piston movement is provided to solve the problems of mechanical noise and low reliability caused by the use of exhaust valve plates when the air compressor is exhausted in the prior art. In order to solve the above problems, this embodiment provides a pressure-stabilizing exhaust mechanism, which is used to connect the air compressor buffer chamber and control the opening and closing of the exhaust hole. The pressure-stabilizing exhaust mechanism includes an exhaust valve body, an exhaust valve housing and a piston. When the piston slides upward along the slide rail under the action of the gas pressure until the exhaust hole opens, the circulating medium in the compression chamber is discharged. When the gas pressure is low, the piston falls and the exhaust hole is closed.

[0118] The exhaust valve body comprises a flange base, and the exhaust valve body is connected to the exhaust port through 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 arranged on the sealing part. The exhaust port of the exhaust valve is correspondingly connected with the exhaust port of the exhaust shaft. The circulating medium in the compression chamber flows into the pressure-stabilizing exhaust valve from the exhaust port.

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

[0121] The exhaust port of the exhaust valve body connected to the exhaust port of the exhaust shaft is expanded in a conical shape, which can effectively reduce the flow velocity of the circulating medium and reduce the circulation noise.

[0122] An exhaust hole is also provided at the corresponding position of the exhaust valve housing, and a pressure relief window is also provided above the exhaust hole to prevent the gas pressure from being too high and unable to be discharged in time.

[0123] A limiting mechanism is provided on the top of the exhaust valve housing. When the pressure in the compression chamber is not sufficient to push the piston to open the limiting block, the pressure relief window is in a closed state, and the circulating medium in the exhaust valve cannot flow out from the pressure relief window.

[0124] The pressure-stabilizing exhaust valve controls the movement of the piston through the circulating medium discharged from the compression chamber, and uses the movement of the piston to open and close the exhaust hole of the exhaust valve, so that whenever the gas pressure in the compression chamber pushes the piston to move along the slide rail to the exhaust height, it will start to exhaust automatically. When the gas pressure is low, the piston automatically stops exhausting when it falls, effectively replacing the existing exhaust valve plate structure to control the exhaust stroke of the compression chamber. A pressure relief window is also set. When the gas pressure in the compression chamber is too high, the piston pushes the limit mechanism, and the pressure relief window opens, allowing the gas to be discharged quickly. The pressure-stabilizing exhaust valve structurally avoids the characteristic that the existing exhaust valve plate is easy to deform under high-frequency impact, greatly improves the reliability of the exhaust valve, can reduce the gas circulation noise during the operation of the compressor, has a simple and reliable structure, and provides a comfortable user experience and low cost.

[0125] The existing traditional oil-free scroll air compressor has certain limitations in flow rate and speed due to the eccentric main shaft structure, and the speed is generally 3000-4000r / min; the coaxial high-speed scroll air compressor of this example adopts a central shaft structure and a variable-section scroll tooth design, and the rated speed can reach 10000r / min, meeting the requirements of large flow, high speed and low pressure fluctuation; the present invention is designed with a buffer guide structure at the tail end of the scroll tooth, which effectively reduces the probability of interference and meshing failure of the scroll disk during the meshing process, and greatly improves the air compressor The stability and efficiency of the air compressor are improved. The specific performance parameter improvements are shown in Appendix 1. At the same time, the present invention is designed with heat dissipation water channels on the back of the gas buffer chamber and the inside of the motor housing, and the vortex tooth wall is coated with a high-temperature resistant coating, which effectively reduces the possibility of failure of the air compressor internal vortex teeth and other structures due to thermal deformation. A pressure-stabilizing exhaust mechanism is set at the exhaust end cover. When the vortex teeth are engaged to 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 falls back to the starting position.

[0126] In summary, the present embodiment provides a coaxial high-speed scroll air compressor and an exhaust pressure stabilizing structure design method. The present embodiment drives the active shaft and the active scroll plate to rotate synchronously through a permanent magnet motor. During this process, the torque is transmitted from the eccentric small shaft to the driven scroll plate. The gas is inhaled through the meshing of the scroll plates, and a dynamic crescent-shaped compression chamber formed by the meshing of the scroll teeth is used to achieve efficient compression of the inhaled gas. After the gas is compressed, it passes through the exhaust port and applies an upward thrust to the piston, and the exhaust hole of the exhaust valve is opened and closed by the movement of the piston, so that whenever the gas pressure in the compression chamber pushes the piston to move along the slide rail to the exhaust height, it will start to exhaust automatically. When the gas When the body pressure is low, the piston automatically stops exhausting when it falls, effectively replacing the existing exhaust valve plate structure to control the exhaust stroke of the compression chamber; the coaxial double-tooth variable-section scroll tooth design method proposed in this embodiment can effectively increase the speed of the scroll air compressor, reduce the probability of scroll tooth interference, and highly fit 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 teeth, and improve the operating reliability of the air compressor; this embodiment can effectively increase the operating speed of the scroll air compressor, without the need to match and check the eccentric balance block on the main shaft, has a simple structure and reliable operation, is easy to install, and is suitable for the field of air compressors.

Claims

1. A coaxial high-speed scroll air compressor, characterized in that: The invention comprises a compression chamber, a permanent magnet motor, a power transmission system and an exhaust pressure stabilizing structure; the compression chamber comprises an active scroll disk (8) and a driven scroll disk (10); the permanent magnet motor (7) drives the active scroll disk to rotate via a driving shaft (2); a plurality of eccentric small shafts (9) for driving the driven scroll disk to rotate are arranged at the active scroll disk; the active scroll disk and the driven scroll disk are arranged opposite to each other and meshed through coaxial double-toothed variable-section scroll teeth on their relative disk surfaces; when the active scroll disk and the driven scroll disk rotate, gas is sucked into the meshing area of ​​the scroll teeth between the two disks, and the sucked gas is compressed through the meshing process of the variable-section scroll teeth to improve meshing smoothness and increase compression efficiency, and then the compressed gas is discharged through the exhaust pressure stabilizing structure.

2. A coaxial high-speed scroll air compressor according to claim 1, characterized in that: When the coaxial high-speed scroll air compressor is working, the gas is sucked in, compressed and discharged through the movement of the two scroll plates. Specifically, the active scroll plate is meshed with the passive scroll plate, so that the external gas is gradually sucked into the compression chamber from the air inlet, and 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 moves to 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 pressure, pushing the exhaust piston (28) of the exhaust pressure stabilizing mechanism to move upward. At this time, the exhaust hole (24) is opened, and the compressed gas in the compression chamber is discharged.

3. A coaxial high-speed scroll air compressor according to claim 2, characterized in that: The rotation size of the center position difference between the active scroll and the driven scroll R , the driven scroll is driven to rotate by the four eccentric small shafts on the active scroll; The active scroll plate includes a double-toothed variable-section scroll tooth, four eccentric small shaft bearing holes, and a main shaft bearing hole. The driven scroll plate includes a double-toothed variable-section scroll tooth, four eccentric small shaft bearing holes, and an exhaust duct. The active scroll plate and the driven scroll plate are meshed with the variable-section scroll teeth to form an intake chamber, a compression chamber, and an exhaust chamber. The eccentric small shaft bearing hole is located at the edge of the active and driven scroll plates and does not interfere with the scroll teeth.

4. A coaxial high-speed scroll air compressor according to claim 2, characterized in that: The exhaust pressure stabilizing structure comprises an exhaust valve body (27), an exhaust piston (28), and an exhaust valve cover (23); the exhaust valve cover is provided with an exhaust hole (20) for exhausting compressed gas; When the exhaust piston is pushed up to different heights by the gas, the exhaust holes are opened in sequence according to the different positions of the exhaust piston, so that the compressed gas in the compression chamber is discharged from the exhaust holes to the buffer chamber (12) of the gas buffer chamber. When the exhaust piston is at a low position, the exhaust holes are closed; The exhaust pipe of the exhaust shaft of the driven scroll is circular and is located in the middle of the driven scroll; The exhaust pipe (14) of the air compressor is connected to the frame via a bearing. An exhaust spring sheet is provided outside the exhaust pipe. The outlet exhaust pressure of the air compressor is changed by adjusting the pre-pressure of the exhaust spring sheet. The spring sheet is located in the middle of the gas buffer chamber.

5. A coaxial high-speed scroll air compressor according to claim 4, characterized in that: The exhaust valve body (27) is connected to 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 is in communication with the exhaust shaft of the driven disk; the flange base (26) of the exhaust valve body is fixed to the end cover of the exhaust shaft (11) of the driven disk of the passive scroll disk, the flange base is arranged on the bearing portion of the exhaust valve body, and the exhaust hole is located on the bearing portion; The exhaust valve body comprises a bearing portion and a sealing portion, and the exhaust piston (28) abuts against a slide rail (29) on the inner wall of the exhaust valve body to form a sliding friction pair; exhaust holes are provided at corresponding positions of the inner wall of the bearing portion and the exhaust valve shell, and 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 exhaust shaft of the driven disk starts to exhaust automatically. When the gas pressure is low, the exhaust piston automatically falls to stop exhausting.

6. A coaxial high-speed scroll air compressor according to claim 4, characterized in that: The permanent magnet motor comprises a rotor (3), a stator (6), a sleeve (5), and a winding of the motor, and the power of the permanent magnet motor is transmitted to the active scroll disk through the active shaft; The driving shaft is a hollow structure, and a bolt component is installed inside the hollow structure to fix the active scroll plate on the driving shaft. The driving shaft is fixed inside the air compressor frame through a bearing, and a butterfly spring and a thrust structure are installed at the bottom of the driving shaft; The back of the gas buffer chamber is designed with a circular heat dissipation water channel, and the motor housing (16) of the permanent magnet motor is designed with an arc-shaped heat dissipation water channel inside. The circular heat dissipation water channel and the arc-shaped heat dissipation water channel form an integrated water cooling channel (17). The water cooling channel is arranged equidistantly upward in a spiral from the permanent magnet motor, and heat is dissipated by the flow of cooling water in the water cooling channel.

7. A coaxial high-speed scroll air compressor according to claim 4, characterized in that: The exhaust hole adopts a conical exhaust port with a gradually increasing exhaust diameter to reduce the gas flow rate and reduce the circulation noise. The driven disk exhaust shaft is arranged between the exhaust port of the driven scroll disk and the exhaust pressure stabilizing mechanism. The diameter of the exhaust shaft is larger than the exhaust port. A large-diameter circumferential exhaust shaft is adopted to reduce the gas flow rate and reduce the circulation noise. A silencer plate (13) is provided between the buffer chamber of the gas buffer cavity 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 hole, a pressure relief window and a limit 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 to relieve pressure to prevent the gas pressure in the exhaust valve body from being too high; The pressure-stabilizing exhaust valve cover comprises a connecting portion and a limiting block, wherein the limiting block cooperates with the exhaust piston to prevent the pressure relief window from opening frequently; The number of exhaust holes of the driven scroll disk is multiple, and the multiple exhaust holes are arranged at equal intervals. The flange base bearing portion and the pressure-stabilizing exhaust valve cover both have exhaust holes. When the piston moves upward along the slide rail under the force of the gas, the circulating medium is discharged from the exhaust holes.

8. A coaxial high-speed scroll air compressor according to claim 4, characterized in that: The backs of the active scroll and the driven scroll are both provided with reinforcing ribs, which are radiated from the center to the edge of the scroll and gradually decrease in height; The variable-section scroll teeth of the active scroll and the driven scroll are designed with sealing concave groove structures at their tooth tops, and sealing strips are installed inside the concave grooves to seal the gas. The scroll tooth walls are coated with wear-resistant and high-temperature-resistant coatings.

9. A coaxial high-speed scroll air compressor according to claim 1, characterized in that: The tooth profile generatrix of the variable cross-section scroll gear is a variable diameter base circle involute, the scroll gear head is modified by a single arc, and the scroll gear tail is designed with a buffer-shaped flow guide structure; The coaxial double-toothed variable-section vortex gear comprises a first active vortex gear and a second active vortex gear; the meshing profile of the first active vortex gear comprises four smoothly connected curves, which are: an equidistant curve ab of the first variable-diameter base circle involute, an equidistant curve ac of the first circle involute, an equidistant curve bd of the second circle involute and an equidistant curve cd of the second variable-diameter base circle involute; the movable vortex gear profile and the static vortex gear profile are fully and correctly meshed; the vortex gear thickness gradually increases from the outer ring to the center, the vortex gear thickness at the outermost part is the smallest, and the thickness at the center of the vortex gear is the largest.

10. A design method for a coaxial high-speed scroll air compressor, used for designing the tooth profile of a variable-section scroll tooth in claim 9, characterized in that: The steps include: Step S1: Draw a base circle with a radius of R b1 The coefficient of variation is x , the involute angle is phi e The variable diameter base circle generatrix curve A1; Step S2, rotating the variable diameter base circle generatrix curve A1 by 90°, 180°, and 270° respectively to obtain variable diameter base circle curves B1, C1, and D1; Step S3, the generation process of the first active scroll tooth and the second active scroll tooth is the same. In the generation process of the first active scroll tooth, the normal equidistance method is used to obtain lines A2 and A3 with the eccentric distance as the normal distance, wherein A2 and A3 are conjugate profiles; the base circle generatrix A1 is deleted, the inner profile D2 of D1 is corrected at the tail end of the scroll tooth, and the outer profile A3 of the base circle generatrix A1 and the inner profile D2 of D1 are used as the tooth profile lines to generate the scroll tooth.

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