Pneumatic radial bearing assembly, pneumatic bearing assembly, air suspension motor and compressor

Abstract

The invention provides a pneumatic radial bearing assembly, a pneumatic bearing assembly, an air suspension motor and a compressor, and the pneumatic radial bearing assembly comprises a first radial bearing and a first radial bearing pedestal, and the first radial bearing is located on the radial inner circumference of the first radial bearing pedestal. A first inner channel is formed in the first radial bearing seat, can conduct airflow to one axial end of the first radial bearing and can also conduct airflow to the other axial end of the first radial bearing; and supporting gas can be provided for the two axial ends of the first radial bearing. According to the invention, cooling gas is directly introduced into the bearing through the internal pipeline to directly cool the bearing body for heat conduction, the contact area is large, and the cooling efficiency is better; the air suspension bearing motor solves the problems of low bearing performance, even work failure and the like caused by poor heat dissipation efficiency of a foil bearing of an existing air suspension bearing motor.

Description

Technical Field

[0001] The present invention relates to the technical field of air bearings, and particularly to a pneumatic radial bearing assembly, a pneumatic bearing assembly, a magnetic levitation motor, and a compressor. Background Art

[0002] Gas dynamic pressure bearings have the advantages of high precision, pollution-free, high speed, and simple structure. Gas dynamic pressure bearings have been widely used in high-speed rotating machinery such as oil-free turbines of aeroengines, cryogenic expanders, and air cycle machines of airplanes.

[0003] Foil gas dynamic pressure bearings are relatively widely used in gas dynamic pressure bearings. A dynamic pressure gas film is formed in the rotor-bearing air gap through the high-speed rotation of the rotor to support the rotor suspension. The load-carrying capacity of the foil gas dynamic pressure bearing increases with the increase in rotational speed, and theoretically, there is no limit to the rotational speed of the rotor, and it has broad application prospects at high rotational speeds. The manufacturing and assembly accuracy of the bearing is high, the gap between the bearing and the journal / rotor is extremely small, and the load-carrying capacity is relatively poor compared with ball bearings. In actual applications, foil bearings are extremely prone to working failure due to poor heat dissipation efficiency or low load-carrying performance. How to improve the heat dissipation efficiency and load-carrying performance of foil gas bearings in the design of high-speed motors has always been a technical problem that needs to be solved by those skilled in the art.

[0004] Due to the technical problems in the magnetic levitation bearing motor in the prior art, such as poor heat dissipation efficiency of the foil bearing, resulting in low load-carrying performance and even working failure, the present invention studies and designs a pneumatic radial bearing assembly, a pneumatic bearing assembly, a magnetic levitation motor, and a compressor. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the magnetic levitation bearing motor in the prior art, such as poor heat dissipation efficiency of the foil bearing, resulting in low load-carrying performance and even working failure, so as to provide a pneumatic radial bearing assembly, a pneumatic bearing assembly, a magnetic levitation motor, and a compressor.

[0006] To solve the above problems, the present invention provides a pneumatic radial bearing assembly, which includes:

[0007] A first radial bearing and a first radial bearing seat. The first radial bearing is located on the radial inner circumference of the first radial bearing seat, and a first internal channel is provided inside the first radial bearing seat. The first internal channel can conduct air flow to one axial end of the first radial bearing, and the first internal channel can also conduct air flow to the other axial end of the first radial bearing to provide support gas for both axial ends of the first radial bearing.

[0008] In some embodiments,

[0009] The first internal passage includes a first air intake groove, a first air passage, a first air passage outlet, and a second air passage outlet. The first air intake groove can introduce gas. The first air passage is located on the inner circumference of the first air intake groove and is in communication with the first air intake groove. The first air passage has a distance greater than 0 from both axial end faces of the first radial bearing seat. The first air passage outlet can communicate with the first air passage and conduct gas to one axial end of the first radial bearing. The second air passage outlet can also communicate with the first air passage and conduct gas to the other axial end of the first radial bearing.

[0010] In some embodiments,

[0011] The first air passage outlet communicates with the radially inner end of the first air passage and penetrates to the inner peripheral surface of the central shaft hole of the first radial bearing seat. The first air passage outlet is located at one axial end of the first radial bearing to conduct gas to one axial end of the first radial bearing;

[0012] The first internal passage further includes a second air passage. The second air passage is located inside the first radial bearing seat and extends along the axial direction of the first radial bearing seat. One end of the second air passage communicates with the first air passage, and the other end communicates with the second air passage outlet. The second air passage outlet extends radially along the first radial bearing seat and penetrates to the inner peripheral surface of the central shaft hole of the first radial bearing seat. The second air passage outlet is located at the other axial end of the first radial bearing to conduct gas to the other axial end of the first radial bearing.

[0013] In some embodiments,

[0014] It further includes an annular air passage and a dispersion air passage. Both the annular air passage and the dispersion air passage are provided inside the first radial bearing seat. The radially inner end of the first air passage communicates with the annular air passage. The radially inner end of the dispersion air passage extends to the inner peripheral surface of the central shaft hole of the first radial bearing seat to form the first air passage outlet. The radially outer end of the dispersion air passage has a distance greater than 0 from the radially outer periphery of the first radial bearing seat, and the dispersion air passage intersects and communicates with the annular air passage.

[0015] In some embodiments,

[0016] The dispersion air ducts extend along the radial direction of the first radial bearing housing. The annular air duct is located on the outer periphery of the central shaft hole of the first radial bearing housing and is annular. The annular air duct is spaced from the central shaft hole by a distance greater than 0. There are multiple dispersion air ducts, and the multiple dispersion air ducts are arranged at intervals along the circumferential direction of the first radial bearing housing. The radial inner end of each dispersion air duct extends to the inner peripheral surface of the central shaft hole of the first radial bearing housing to form the first air duct outlet, and each dispersion air duct communicates with the annular air duct.

[0017] In some embodiments,

[0018] It further includes a dispersion air duct outlet, which is arranged at the position of the dispersion air duct and penetrates to one axial end face of the first radial bearing housing, so that one end of the dispersion air duct outlet communicates with the dispersion air duct and the other end communicates with one axial end face of the first radial bearing housing. One axial end face of the first radial bearing housing faces the axial bearing to supply gas to the axial bearing.

[0019] In some embodiments,

[0020] There are multiple dispersion air duct outlets. At least two dispersion air duct outlets are arranged at the position of each dispersion air duct, and adjacent two dispersion air duct outlets are arranged at intervals; and a gas guiding groove is further arranged on one axial end face of the first radial bearing housing, and the other end of the dispersion air duct outlet communicates with the gas guiding groove; there are also multiple gas guiding grooves, and the multiple gas guiding grooves are arranged at intervals along the circumferential direction, and the gas guiding grooves are arranged in one-to-one correspondence with the dispersion air ducts, and the dispersion air ducts are communicated with the gas guiding grooves through the dispersion air duct outlets.

[0021] In some embodiments,

[0022] When observed in the direction perpendicular to one axial end face of the first radial bearing housing, the gas guiding groove is an L-shaped gas groove.

[0023] In some embodiments,

[0024] It further includes a second radial bearing and a second radial bearing housing. The second radial bearing is located on the radial inner periphery of the second radial bearing housing, and a second internal channel is arranged inside the second radial bearing housing. The second internal channel can conduct air flow to one axial end of the second radial bearing, and the second internal channel can also conduct air flow to the other axial end of the second radial bearing to supply support gas to both axial ends of the second radial bearing.

[0025] In some embodiments,

[0026] The second internal passage includes a second air extraction groove, a third air passage, a third air passage outlet, and a fourth air passage outlet. The second air extraction groove is capable of introducing gas. The third air passage is located on the inner circumference of the second air extraction groove and communicates with the second air extraction groove. The third air passage has a distance greater than 0 from both axial end faces of the second radial bearing housing. The third air passage outlet can communicate with the third air passage and conduct gas to one axial end of the second radial bearing. The fourth air passage outlet can also communicate with the third air passage and conduct gas to the other axial end of the second radial bearing.

[0027] In some embodiments,

[0028] The second internal passage further includes a fourth air passage. The fourth air passage is located inside the second radial bearing housing and extends along the axial direction of the second radial bearing housing. The fourth air passage outlet extends along the radial direction of the second radial bearing housing. One axial end of the fourth air passage communicates with the third air passage outlet, and the other axial end of the fourth air passage communicates with the fourth air passage outlet. The third air passage outlet penetrates to the inner circumferential surface of the central shaft hole of the first radial bearing housing and is located at one axial end of the second radial bearing to conduct gas to one axial end of the second radial bearing. The fourth air passage outlet penetrates to the inner circumferential surface of the central shaft hole of the second radial bearing housing and is located at the other axial end of the second radial bearing to conduct gas to the other axial end of the second radial bearing.

[0029] The present invention further provides a pneumatic bearing assembly, which includes the aforementioned pneumatic radial bearing assembly and further includes a pneumatic axial bearing assembly. The pneumatic axial bearing assembly is located on one axial side of the first radial bearing housing, and the gas in the first internal passage can be conducted to the pneumatic axial bearing assembly to provide support gas for the pneumatic axial bearing assembly.

[0030] In some embodiments,

[0031] When a dispersion air passage outlet is further included, the pneumatic axial bearing assembly includes a first axial bearing, a thrust plate, and a second axial bearing. The first axial bearing is located on one axial side of the thrust plate, the second axial bearing is located on the other axial side of the thrust plate, and the second axial bearing faces the first radial bearing housing. The second axial bearing has an axially extending third air extraction groove, and the third air extraction groove is opposite to and communicates with the dispersion air passage outlet to introduce gas into the second axial bearing to provide support gas.

[0032] The present invention further provides an air suspension motor, which includes the aforementioned pneumatic bearing assembly and further includes a housing. A gas supply passage is provided inside the housing, and the gas supply passage communicates with the first internal passage of the first radial bearing housing.

[0033] In some embodiments,

[0034] When a second radial bearing housing and a second internal passage are further included, the air supply passage is also in communication with the second internal passage on the second radial bearing housing.

[0035] The present invention also provides a compressor, which includes the aforementioned air suspension motor.

[0036] The pneumatic radial bearing assembly, pneumatic bearing assembly, air suspension motor and compressor provided by the present invention have the following beneficial effects:

[0037] 1. By providing a first internal passage inside the first radial bearing housing of the pneumatic radial bearing assembly, the present invention can conduct air flow to one axial end of the first radial bearing, and the first internal passage can also conduct air flow to the other axial end of the first radial bearing, so as to provide support gas for both axial ends of the first radial bearing. The primary compressed gas can enter the radial bearing housing air passage after being cooled in the casing through the air guide passage, providing radial bearing capacity to support the rotor and cooling the foil gas journal bearing, accelerating the air heat convection speed between the radial bearing and the axial bearing, improving the cooling efficiency of the radial bearing and the axial bearing, increasing the heat dissipation efficiency of the pneumatic radial bearing system, increasing the bearing load capacity while also improving the stability and service life of the radial system; the present invention directly conducts the cooling gas to the inside of the bearing through the internal pipeline to directly cool the bearing body for heat conduction, with a larger contact area and better cooling efficiency; secondly, the present invention conducts high-pressure gas to both axial ends of the radial bearing to generate axial high-pressure sealing, increasing the ambient pressure at both ends of the radial bearing, reducing the end leakage of the high-pressure gas inside the radial bearing, increasing the ambient pressure at both ends of the radial bearing, improving the load capacity, and effectively solving the problems of poor heat dissipation efficiency of the foil bearing in the existing air suspension bearing motor, resulting in low load capacity and even working failure.

[0038] 2. By providing an annular air passage and a dispersion air passage inside the first radial bearing housing, the present invention can increase the number and area of the first air passage outlets, thereby increasing the gas supply area to one axial end of the first radial bearing, improving the gas supply volume to the first radial bearing, and further improving the support performance and cooling effect of the first radial bearing.

[0039] 3. The present invention also provides a dispersed air duct outlet on the first radial bearing seat, which can penetrate to one end face of the axial side of the first radial bearing seat and face the axial bearing to supply gas to the axial bearing. The high-pressure gas of the present invention flows into both sides of the radial bearing and the fixed end of the axial bearing through the air ducts distributed in the inner circle of the radial bearing seat, increasing the ambient pressure at the suction end of the bearing, increasing the edge deformation of the radial bearing, and improving the load-bearing performance; further, through the third air guiding groove on the second axial bearing, gas can be introduced from the dispersed air duct outlet into the second axial bearing to provide gas for supporting and cooling the axial bearing, improving the cooling performance and the load-bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a front sectional structural schematic diagram of the air suspension high-speed motor of the present invention;

[0041] Figure 2 is a front sectional structural schematic diagram of the air suspension high-speed motor and the whole compressor of the present invention;

[0042] Figure 3 is a front sectional structural diagram of the first radial bearing seat of the present invention;

[0043] Figure 4 is a three-dimensional structural diagram of one side of the first radial bearing seat of the present invention;

[0044] Figure 5 is a front sectional structural diagram of the first radial bearing seat at the first air duct of the present invention;

[0045] Figure 6 is a longitudinal sectional structural diagram of the pneumatic radial bearing of the present invention;

[0046] Figure 7 is a front structural diagram of the pneumatic axial bearing of the present invention.

[0047] The reference numerals are shown as:

[0048] 1. Housing; 2. Stator; 3. Rotor; 4. First radial bearing housing; 401. First air extraction groove; 402. First air passage; 403. First air passage outlet; 404. Second air passage; 405. Second air passage outlet; 406. Dispersion air passage outlet; 407. Air guiding groove; 408. Fixed end of radial bearing; 409. Annular air passage; 410. Dispersion air passage; 5. Second radial bearing housing; 501. Second air extraction groove; 502. Third air passage; 503. Third air passage outlet; 504. Fourth air passage outlet; 505. Fourth air passage; 6. First radial bearing; 7. Second radial bearing; 8. First-stage diffuser; 9. Second-stage diffuser; 10. First axial bearing; 11. Second axial bearing; 116. Third air extraction groove; 12. Thrust disc; 13. Cooling water channel; 14. First-stage impeller; 15. Second-stage impeller; 16. First volute; 17. Second volute; 18. Connecting pipe; 19. Air extraction port; 101. Housing air inlet; 102. Cooling air passage; 103. Housing air outlet; 25. Bottom foil; 26. Wave foil; 27. Top foil; 28. Arch-shaped hollow structure. Detailed implementation manners

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof in subsequent drawings is not necessary.

[0052] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. is generally based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0053] For the convenience of description, spatial relative terms such as "above", "over", "on the upper surface", "above", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above" can include both the orientation of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations are made for the spatial relative descriptions used here.

[0054] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meaning, and thus should not be construed as limiting the protection scope of the present invention.

[0055] Such as Figure 1-7As shown in the figure, the present invention provides a pneumatic radial bearing assembly, which includes:

[0056] A first radial bearing 6 and a first radial bearing housing 4, the first radial bearing 6 is located on the radial inner circumference of the first radial bearing housing 4, and a first internal channel is provided inside the first radial bearing housing 4. The first internal channel can conduct air flow to one axial end of the first radial bearing 6, and the first internal channel can also conduct air flow to the other axial end of the first radial bearing 6 to provide support gas for both axial ends of the first radial bearing 6.

[0057] In the present invention, by providing a first internal channel inside the first radial bearing housing of the pneumatic radial bearing assembly, the air flow can be conducted to one axial end of the first radial bearing, and the first internal channel can also conduct the air flow to the other axial end of the first radial bearing to provide support gas for both axial ends of the first radial bearing. The primary compressed gas can enter the air duct of the radial bearing housing after being cooled by the air duct in the casing, providing radial bearing capacity to support the rotor and cooling the foil gas journal bearing, accelerating the air heat convection speed between the radial bearing and the axial bearing, improving the cooling efficiency of the radial bearing and the axial bearing, increasing the heat dissipation efficiency of the pneumatic radial bearing system, increasing the bearing capacity performance while also improving the stability and service life of the radial system.

[0058] The existing technology solution is to introduce the cooling gas from the axial end face of the bearing housing into the radial bearing and the axial bearing chambers to cool the bearing system, mainly relying on the gas inhaled during the operation of the bearing for convective heat transfer, but there is a situation where the flow resistance is large, resulting in low cooling efficiency; different from this, the present invention directly conducts the cooling gas to the inside of the bearing through the internal pipeline to directly cool the bearing body for heat conduction, with a larger contact area and better cooling efficiency; secondly, the present invention conducts the high-pressure gas to both axial ends of the radial bearing to generate axial high-pressure sealing, increasing the ambient pressure at both ends of the radial bearing, reducing the end leakage of the high-pressure gas inside the radial bearing, increasing the ambient pressure at both ends of the radial bearing, improving the bearing capacity performance, and effectively solving the problems of poor heat dissipation efficiency of the foil bearing in the existing air suspension bearing motor, resulting in low bearing capacity, or even working failure.

[0059] In some embodiments,

[0060] The first internal passage includes a first air intake groove 401, a first air passage 402, a first air passage outlet 403, and a second air passage outlet 405 (preferably, the first air intake groove 401 is a gas guiding through hole penetrating through the axial two end faces of the first radial bearing housing 4). The first air intake groove 401 can introduce gas. The first air passage 402 is located on the inner circumference of the first air intake groove 401 and communicates with the first air intake groove 401. The first air passage 402 has a distance greater than 0 from both axial end faces of the first radial bearing housing 4. The first air passage outlet 403 can communicate with the first air passage 402 and conduct gas to one axial end of the first radial bearing 6. The second air passage outlet 405 can also communicate with the first air passage 402 and conduct gas to the other axial end of the first radial bearing 6.

[0061] This is a preferred structural form of the first internal passage of the present invention. Gas can be introduced through the first air intake groove, especially by communicating with the gas passage on the casing to introduce gas. The first air passage is located inside the first radial bearing housing and communicates with the first air intake groove, capable of introducing gas into the interior of the first radial bearing housing, and guiding the gas to the axial two ends of the first radial bearing through the first air passage outlet and the second air passage outlet, providing gas for the axial two ends of the first radial bearing, improving the ambient pressure at both ends of the radial bearing, enhancing the load-bearing performance, and directly leading to the inside of the bearing through the internal pipeline, directly cooling the bearing body for heat conduction, with a larger contact area and better cooling efficiency.

[0062] In some embodiments,

[0063] The first air passage outlet 403 communicates with the radially inner end of the first air passage 402 and penetrates to the inner circumferential surface of the central shaft hole of the first radial bearing housing 4. The first air passage outlet 403 is located at one axial end of the first radial bearing 6 to conduct gas to one axial end of the first radial bearing 6;

[0064] The first internal passage further includes a second air passage 404. The second air passage 404 is located inside the first radial bearing housing 4 and extends along the axial direction of the first radial bearing housing 4. One end of the second air passage 404 communicates with the first air passage 402, and the other end communicates with the second air passage outlet 405. The second air passage outlet 405 extends along the radial direction of the first radial bearing housing 4 and penetrates to the inner circumferential surface of the central shaft hole of the first radial bearing housing 4. The second air passage outlet 405 is located at the other axial end of the first radial bearing 6 to conduct gas to the other axial end of the first radial bearing 6.

[0065] This is a further preferred structural form of the first internal channel of the present invention, that is, through the second air duct extending axially, it can communicate with the first air duct, so as to guide the gas to the second air duct outlet at the other axial end, and the first air duct outlet can be conducted through the first air duct, so as to achieve the effect of supplying gas to both axial ends of the first radial bearing through the inside of the first radial bearing, improving the cooling performance while increasing the ambient pressure at both ends of the radial bearing and improving the load-bearing performance.

[0066] In some embodiments,

[0067] It further includes an annular air duct 409 and a dispersion air duct 410. The annular air duct 409 and the dispersion air duct 410 are both arranged inside the first radial bearing housing 4. The radially inner end of the first air duct 402 communicates with the annular air duct 409. The radially inner end of the dispersion air duct 410 extends to the inner peripheral surface of the central shaft hole of the first radial bearing housing 4 to form the first air duct outlet 403. The radially outer end of the dispersion air duct 410 is spaced from the radially outer periphery of the first radial bearing housing 4 by a distance greater than 0, and the dispersion air duct 410 intersects and communicates with the annular air duct 409.

[0068] The present invention also arranges an annular air duct and a dispersion air duct inside the first radial bearing housing, which can increase the number and area of the first air duct outlets, and further increase the gas supply area supplied to one axial end of the first radial bearing, improve the gas supply volume of the first radial bearing, and further improve the support performance and cooling effect of the first radial bearing; the gas is sequentially conducted to the first air duct outlet through the first air duct, the annular air duct and the dispersion air duct, so as to achieve the effect of supplying gas to one axial end of the first radial bearing through the inside.

[0069] In some embodiments,

[0070] The dispersion air duct 410 extends along the radial direction of the first radial bearing housing 4. The annular air duct 409 is located on the outer periphery of the central shaft hole of the first radial bearing housing 4 and is circular. The annular air duct 409 is spaced from the central shaft hole by a distance greater than 0. The dispersion air ducts 410 are multiple, and the multiple dispersion air ducts 410 are arranged at intervals along the circumferential direction of the first radial bearing housing 4. The radially inner end of each dispersion air duct 410 extends to the inner peripheral surface of the central shaft hole of the first radial bearing housing 4 to form the first air duct outlet 403, and each dispersion air duct 410 intersects and communicates with the annular air duct 409.

[0071] This is a further preferred structural form of the distributed air duct and the annular air duct of the present invention. Through a plurality of distributed air ducts, it is possible to form an interval distribution in the circumferential direction and communicate with the annular air duct respectively, increasing the gas flow area in the circumferential direction, improving the air supply volume to one axial end of the first radial bearing, and while improving the cooling performance, further improving the load-bearing performance of the first radial bearing.

[0072] In some embodiments,

[0073] It further includes a distributed air duct outlet 406, and the distributed air duct outlet 406 is arranged at the position of the distributed air duct 410 and penetrates to one axial side end face of the first radial bearing housing 4, so that one end of the distributed air duct outlet 406 is communicated with the distributed air duct 410 and the other end is communicated to one axial side end face of the first radial bearing housing 4. One axial side end face of the first radial bearing housing 4 faces the axial bearing to supply gas to the axial bearing.

[0074] The present invention also arranges a distributed air duct outlet on the first radial bearing housing, which can penetrate to one axial side end face of the first radial bearing housing and face the axial bearing to supply gas to the axial bearing. The high-pressure gas of the present invention flows into both sides of the radial bearing and the fixed end of the axial bearing through the air ducts distributed on the inner circle of the radial bearing housing, increasing the ambient pressure at the suction end of the bearing and increasing the edge deformation of the radial bearing, thereby allowing the bearing to have a larger eccentricity and improving the load-bearing performance of the bearing.

[0075] In some embodiments,

[0076] There are a plurality of the distributed air duct outlets 406. At least two of the distributed air duct outlets 406 are arranged at the position of each distributed air duct 410, and adjacent two distributed air duct outlets 406 are arranged at intervals; and a gas guiding groove 407 is further arranged on one axial side end face of the first radial bearing housing 4, and the other end of the distributed air duct outlet 406 is communicated to the gas guiding groove 407; there are also a plurality of the gas guiding grooves 407, and the plurality of gas guiding grooves 407 are arranged at intervals in the circumferential direction, and the gas guiding grooves 407 are arranged in one-to-one correspondence with the distributed air ducts 410, and the distributed air ducts 410 are communicated with the gas guiding grooves 407 through the distributed air duct outlets 406.

[0077] This is the preferred structural form of the dispersed air duct outlet of the present invention. Through multiple and spaced dispersed air duct outlets, the air supply volume and air supply area to the axial bearing can be increased, and the cooling performance and load-bearing performance of the axial bearing can be improved. Through the setting of the air guide groove, the gas can be evenly spread on the axial end face of the first radial bearing seat, thereby improving the uniformity of gas distribution on the end face, increasing the gas distribution area, further ensuring the area and uniformity of axial air supply, improving cooling performance, and improving support stability; multiple air guide grooves can further increase the air supply area, further improve cooling performance and support stability.

[0078] In some embodiments,

[0079] When viewed in a direction perpendicular to an axial end surface of the first radial bearing seat 4 , the air guide groove 407 is an L-shaped air groove.

[0080] This is the preferred structural form of the air guide groove of the present invention. By forming an L-shaped air groove, its distribution area on the axial end face can be further increased, further ensuring the area and uniformity of the axial air supply, improving the cooling performance, and improving the stability of the support.

[0081] like Figure 3 , Figure 4 and Figure 5 As shown, the first radial bearing seat 4 has a plurality of T-shaped or L-shaped air guide grooves 407 (the number is consistent with the wattage of the axial bearing) uniformly distributed along the end surface of the first radial bearing seat 4, and a plurality of dispersed air duct outlets 406 are uniformly distributed along the circumferential direction on the inner end surface of the air guide groove 407, connected to the first air duct 402 of the first radial bearing seat 4, to provide high-pressure low-temperature gas to the second axial bearing, increase its inlet environmental pressure to increase the bearing capacity, and improve the cooling efficiency of the axial bearing. High-pressure low-temperature gas flows from the plurality of first air ducts 402 and second air ducts 404 near the upper and lower end surfaces of the inner hole of the first radial bearing seat 4 to both sides of the first radial bearing 6, provide high-pressure low-temperature gas to the radial bearing, increase the environmental pressure of the first radial bearing 6, increase the deformation at the edge of the foil, and improve the bearing capacity of the radial bearing. The flow of low-temperature gas can take away the heat generated by the friction loss of the air caused by the high-speed rotation of the radial bearing and the rotor, reduce the temperature rise, and inhibit the radial bearing from expanding and deforming at high temperature and failing.

[0082] In some embodiments,

[0083] It further includes a second radial bearing 7 and a second radial bearing housing 5. The second radial bearing 7 is located on the radial inner circumference of the second radial bearing housing 5, and a second internal channel is provided inside the second radial bearing housing 5. The second internal channel can conduct air flow to one axial end of the second radial bearing 7, and the second internal channel can also conduct air flow to the other axial end of the second radial bearing 7, so as to provide support gas for both axial ends of the second radial bearing 7.

[0084] In the present invention, by providing a second internal channel inside the second radial bearing housing of the pneumatic radial bearing assembly, the air flow can be conducted to one axial end of the second radial bearing, and the second internal channel can also conduct the air flow to the other axial end of the second radial bearing, so as to provide support gas for both axial ends of the second radial bearing. The primary compressed gas can enter the air duct of the radial bearing housing after being cooled by the air guide channel in the casing, providing radial bearing capacity to support the rotor and cooling the foil gas journal bearing, accelerating the air heat convection speed between the radial bearing and the axial bearing, improving the cooling efficiency of the radial bearing and the axial bearing, increasing the heat dissipation efficiency of the pneumatic radial bearing system, increasing the bearing capacity performance while also improving the stability and service life of the radial system.

[0085] In the present invention, the cooling gas is directly led into the bearing through the internal pipeline to directly cool the bearing body by heat conduction, with a relatively large contact area and better cooling efficiency. Secondly, in the present invention, the high-pressure gas is led to both axial ends of the radial bearing, increasing the ambient pressure at both ends of the radial bearing, which can improve the bearing capacity performance and effectively solve the problems existing in the existing air suspension bearing motor, such as poor heat dissipation efficiency of the foil bearing, resulting in low bearing capacity performance and even working failure.

[0086] In some embodiments,

[0087] The second internal channel includes a second air intake groove 501, a third air duct 502, a third air duct outlet 503 and a fourth air duct outlet 504. The second air intake groove 501 can introduce gas. The third air duct 502 is located on the inner circumference of the second air intake groove 501 and is connected to the second air intake groove 501. The third air duct 502 has a distance greater than 0 from both axial end faces of the second radial bearing housing 5. The third air duct outlet 503 can be connected to the third air duct 502 and conduct gas to one axial end of the second radial bearing 7, and the fourth air duct outlet 504 can also be connected to the third air duct 502 and conduct gas to the other axial end of the second radial bearing 7.

[0088] This is a preferred structural form of the second internal passage of the present invention. Gas can be introduced through the second air intake groove, especially in communication with the gas passage on the casing to introduce gas. The third air passage is located inside the second radial bearing housing and communicates with the second air intake groove, capable of introducing gas into the inside of the second radial bearing housing, and guiding the gas to both axial ends of the second radial bearing through the third air passage outlet and the fourth air passage outlet, providing gas to both axial ends of the second radial bearing, increasing the ambient pressure at both ends of the radial bearing, improving the load-bearing performance, and directly leading to the inside of the bearing through the internal pipeline, directly cooling the bearing body for heat conduction, with a larger contact area and better cooling efficiency.

[0089] In some embodiments,

[0090] The second internal passage further includes a fourth air passage 505. The fourth air passage 505 is located inside the second radial bearing housing 5 and extends along the axial direction of the second radial bearing housing 5. The fourth air passage outlet 504 extends along the radial direction of the second radial bearing housing 5. One axial end of the fourth air passage 505 communicates with the third air passage outlet 503, and the other axial end of the fourth air passage 505 communicates with the fourth air passage outlet 504. The third air passage outlet 503 penetrates to the inner peripheral surface of the central shaft hole of the first radial bearing housing 4 and is located at one axial end of the second radial bearing 7 to conduct gas to one axial end of the second radial bearing 7. The fourth air passage outlet 504 penetrates to the inner peripheral surface of the central shaft hole of the second radial bearing housing 5 and is located at the other axial end of the second radial bearing 7 to conduct gas to the other axial end of the second radial bearing 7.

[0091] This is a further preferred structural form of the second internal passage of the present invention, that is, through the fourth air passage extending axially, it can communicate with the third air passage, thereby guiding the gas to the third air passage outlet at one axial end and the fourth air passage outlet at the other axial end, so as to achieve the effect of supplying gas to both axial ends of the first radial bearing through the inside of the first radial bearing, improving the cooling performance while increasing the ambient pressure at both ends of the radial bearing and improving the load-bearing performance.

[0092] The present invention also provides a pneumatic bearing assembly, which includes the aforementioned pneumatic radial bearing assembly and further includes a pneumatic axial bearing assembly. The pneumatic axial bearing assembly is located on one axial side of the first radial bearing housing 4, and the gas in the first internal passage can be conducted to the pneumatic axial bearing assembly to provide support gas for the pneumatic axial bearing assembly.

[0093] In some embodiments,

[0094] When a dispersion air duct outlet 406 is further included, the pneumatic axial bearing assembly includes a first axial bearing 10, a thrust disc 12, and a second axial bearing 11. The first axial bearing 10 is located on one axial side of the thrust disc 12, the second axial bearing 11 is located on the other axial side of the thrust disc 12, and the second axial bearing 11 faces the first radial bearing seat 4. An axially extending third air guiding groove 116 is formed on the second axial bearing 11. The third air guiding groove 116 faces and communicates with the dispersion air duct outlet 406 so as to introduce gas into the second axial bearing 11 to provide support gas.

[0095] Further, through the third air guiding groove on the second axial bearing, the present invention can introduce gas from the dispersion air duct outlet into the second axial bearing, providing support and cooling gas for the axial bearing, improving the cooling performance, and enhancing the load-bearing performance. The high-pressure gas of the present invention flows into both sides of the radial bearing and the fixed end of the axial bearing through the air ducts distributed on the inner circle of the radial bearing seat, increasing the ambient pressure at the suction end of the bearing, increasing the edge deformation of the radial bearing, and improving the load-bearing performance.

[0096] As Figure 6 and Figure 7 shown, the first radial bearing 6 has a bottom foil 25, a corrugated foil 26, and a top foil 27. An arched hollow structure 28 is formed between the corrugated foil 26, the bottom foil 25, and the top foil 27. High-pressure and low-temperature gas flows into the motor cavity from the arched hollow structure 28, reducing the temperature rise and deformation of the foil. A plurality of third air guiding grooves 116 are evenly distributed along the circumferential direction on the top foil of the second axial bearing 11. High-pressure and low-temperature gas flows from the first radial bearing seat 4 into the air film inlet at the fixed end of the top foil of the axial bearing through the third air guiding grooves 116, increasing the ambient pressure of the axial bearing and taking away the heat generated by the air friction loss during the high-speed rotation of the bearing and the rotor, reducing the temperature rise of the axial bearing.

[0097] The present invention also provides an air suspension motor, which includes the aforementioned pneumatic bearing assembly and further includes a housing 1. A gas supply channel is arranged inside the housing 1, and the gas supply channel communicates with the first internal channel of the first radial bearing seat 4.

[0098] The present invention cools the first-stage compressed gas through the air guiding channel and then enters the radial bearing seat, accelerating the air heat convection speed between the radial bearing and the axial bearing, improving the cooling efficiency of the radial bearing and the axial bearing. The gas in the housing is introduced into the radial bearing seat through the first or second internal channel and then guided to both axial ends of the radial bearing, which can form a high-pressure seal on both axial sides of the radial bearing and is introduced to the end face of the top foil of the axial bearing through the dispersion air duct outlet. Compared with the prior art, the prior art only provides cooling gas, while the present invention not only provides cooling gas but also provides seals at both ends of the radial bearing, increasing the ambient pressure at both ends of the radial bearing and improving the load-bearing performance.

[0099] The high-pressure gas of the present invention flows into both sides of the radial bearing and the fixed end of the axial bearing through the air ducts distributed in the inner circle of the radial bearing seat, increasing the ambient pressure at the air suction end of the bearing, increasing the edge deformation of the radial bearing, and improving the load-bearing performance.

[0100] In some embodiments,

[0101] When a second radial bearing seat 5 and a second internal channel are further included, the air supply channel is also communicated with the second internal channel on the second radial bearing seat 5.

[0102] The present invention also provides a compressor, which includes the aforementioned air suspension motor.

[0103] The present invention provides an air suspension high-speed motor and a compressor, as Figure 1 and Figure 2 shown, which includes a housing 1, a stator 2, and a high-speed rotor 3; a first radial bearing seat 4 and a second radial bearing seat 5 for supporting the rotor 3 are respectively installed at both ends of the housing 1, a first radial bearing 6 and a second radial bearing 7 are respectively installed on the first radial bearing seat 4 and the second radial bearing seat 5, the first radial bearing 6 and the second radial bearing 7 are air suspension foil hydrodynamic bearings, a first-stage diffuser 8 and a second-stage diffuser 9 are respectively installed on the outer sides of the housing 1 on the left and right, a first axial bearing 10 and a second axial bearing 11 are respectively installed on the first-stage diffuser 8 and the first radial bearing seat 4 on the left and right, and the first axial bearing 10 and the second axial bearing 11 are air suspension foil hydrodynamic thrust bearings; both ends of the rotor 3 respectively pass through the first radial bearing seat 4 and the first-stage diffuser 8, the second radial bearing seat 5 and the second-stage diffuser 9 in sequence, and a first-stage impeller 14 and a second-stage impeller 15 are respectively installed, a thrust disc 12 is assembled on the rotor 3, and the thrust disc 12 is arranged between the first axial bearing 10 and the second axial bearing 11; a first volute 16 and a second volute 17 are respectively installed outside the first-stage impeller 14 and the second-stage impeller 15, and the first volute 16 and the second volute 17 are connected by a connecting pipe 18. The housing 1 is provided with a cooling water channel 13, and the cooling water channel 13 is a spiral water channel along the inside of the housing to cool the motor.

[0104] The cooling air duct 102 of the present invention is axially arranged between the cooling water channels 13 of the housing 1, and the high-temperature and high-pressure gas entering the housing can be cooled to a low temperature by the cooling water in the cooling air duct 102.

[0105] After the high-speed motor starts, the rotor 3 drives the first-stage impeller 14 to rotate at high speed to suck in external gas. Most of the compressed high-temperature and high-pressure gas passes through the connecting pipe 18 and enters the second-stage impeller of the second volute 17 for further compression through the first volute 16. A small part passes through the compressed gas outlet (bleed port 19) on the connecting pipe 18 and enters the cooling air duct 102 through the air inlet 101 of the casing. The compressed gas outlet and the air inlet 101 of the casing are connected by a pipe. The high-pressure and low-temperature gas after casing cooling enters the high-speed motor and the air compressor bearing system. Among them, a part of the high-pressure and low-temperature gas enters the first air duct 402, the second air duct 404 and the dispersed air duct outlet 406 of the first radial bearing housing 4 respectively through the first air bleeding groove 401 on the first radial bearing housing 4. Another part flows into the axial bearing system through the first-stage diffuser air inlet to cool the first axial bearing 10, the second axial bearing 11 and the first radial bearing 6. A part of the high-pressure and low-temperature gas flowing to the second-stage side enters the third air duct 502 and the fourth air duct 505 of the second radial bearing housing 5 respectively through the second air bleeding groove 501. Another part cools the second radial bearing 7 through the compressed air flow path.

[0106] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and variations can still be made, and these improvements and variations should also be regarded as within the protection scope of the present invention.

Claims

1. A pneumatic radial bearing assembly, characterized in that: Comprising: A first radial bearing (6) and a first radial bearing housing (4), the first radial bearing (6) being located on the radial inner circumference of the first radial bearing housing (4), and a first internal passage being provided inside the first radial bearing housing (4), the first internal passage being capable of guiding an air flow to one axial end of the first radial bearing (6) and also capable of guiding the air flow to the other axial end of the first radial bearing (6) so as to provide support gas to both axial ends of the first radial bearing (6).

2. The pneumatic radial bearing assembly according to claim 1, wherein: The first internal passage includes a first air intake groove (401), a first air passage (402), a first air passage outlet (403) and a second air passage outlet (405), the first air intake groove (401) being capable of introducing gas, the first air passage (402) being located on the inner circumference of the first air intake groove (401) and communicating with the first air intake groove (401), the first air passage (402) having a distance greater than 0 from both axial end faces of the first radial bearing housing (4), the first air passage outlet (403) being capable of communicating with the first air passage (402) and guiding the gas to one axial end of the first radial bearing (6), and the second air passage outlet (405) also being capable of communicating with the first air passage (402) and guiding the gas to the other axial end of the first radial bearing (6).

3. The pneumatic radial bearing assembly according to claim 2, wherein: The first air passage outlet (403) communicates with the radial inner end of the first air passage (402) and penetrates to the inner circumferential surface of the central shaft hole of the first radial bearing housing (4), the first air passage outlet (403) being located at one axial end of the first radial bearing (6) so as to guide the gas to one axial end of the first radial bearing (6); The first internal passage further includes a second air passage (404), the second air passage (404) being located inside the first radial bearing housing (4) and extending along the axial direction of the first radial bearing housing (4), one end of the second air passage (404) communicating with the first air passage (402) and the other end communicating with the second air passage outlet (405), the second air passage outlet (405) extending along the radial direction of the first radial bearing housing (4) and penetrating to the inner circumferential surface of the central shaft hole of the first radial bearing housing (4), the second air passage outlet (405) being located at the other axial end of the first radial bearing (6) so as to guide the gas to the other axial end of the first radial bearing (6).

4. The pneumatic radial bearing assembly according to claim 2, wherein: It further includes an annular air passage (409) and a dispersion air passage (410). Both the annular air passage (409) and the dispersion air passage (410) are disposed inside the first radial bearing housing (4). The radially inner end of the first air passage (402) is communicated with the annular air passage (409). The radially inner end of the dispersion air passage (410) extends to the inner peripheral surface of the central shaft hole of the first radial bearing housing (4) to form the first air passage outlet (403). The radially outer end of the dispersion air passage (410) is spaced from the radially outer periphery of the first radial bearing housing (4) by a distance greater than 0, and the dispersion air passage (410) intersects and communicates with the annular air passage (409).

5. The pneumatic radial bearing assembly according to claim 4, wherein: The dispersion air passage (410) extends along the radial direction of the first radial bearing housing (4). The annular air passage (409) is located on the outer periphery of the central shaft hole of the first radial bearing housing (4) and is circular. The annular air passage (409) is spaced from the central shaft hole by a distance greater than 0. The dispersion air passages (410) are multiple. The multiple dispersion air passages (410) are circumferentially spaced along the first radial bearing housing (4). The radially inner end of each dispersion air passage (410) extends to the inner peripheral surface of the central shaft hole of the first radial bearing housing (4) to form the first air passage outlet (403), and each dispersion air passage (410) intersects and communicates with the annular air passage (409).

6. The pneumatic radial bearing assembly according to claim 4 or 5, wherein: It further includes a dispersion air passage outlet (406). The dispersion air passage outlet (406) is disposed at the position of the dispersion air passage (410) and penetrates through to one end face on the axial side of the first radial bearing housing (4), such that one end of the dispersion air passage outlet (406) is communicated with the dispersion air passage (410) and the other end is communicated to one end face on the axial side of the first radial bearing housing (4). One end face on the axial side of the first radial bearing housing (4) faces the axial bearing, so as to supply gas to the axial bearing.

7. The pneumatic radial bearing assembly according to claim 6, wherein: The dispersion air passage outlets (406) are multiple. At least two dispersion air passage outlets (406) are disposed at the position of each dispersion air passage (410), and the adjacent two dispersion air passage outlets (406) are spaced apart; and a gas guiding groove (407) is further disposed on one end face on the axial side of the first radial bearing housing (4). The other end of the dispersion air passage outlet (406) is communicated into the gas guiding groove (407); the gas guiding grooves (407) are also multiple. The multiple gas guiding grooves (407) are circumferentially spaced, and the gas guiding grooves (407) are arranged in one-to-one correspondence with the dispersion air passages (410). The dispersion air passage (410) is communicated with the gas guiding groove (407) through the dispersion air passage outlet (406).

8. The pneumatic radial bearing assembly according to claim 7, wherein: When observed in a direction perpendicular to the axial side end face of the first radial bearing housing (4), the air guide groove (407) is an L-shaped air groove.

9. The pneumatic radial bearing assembly according to any one of claims 1-8, characterized in that: It further includes a second radial bearing (7) and a second radial bearing housing (5). The second radial bearing (7) is located in the radial inner circumference of the second radial bearing housing (5), and a second internal passage is provided inside the second radial bearing housing (5). The second internal passage can conduct air flow to one axial end of the second radial bearing (7), and the second internal passage can also conduct air flow to the other axial end of the second radial bearing (7) to provide support gas to both axial ends of the second radial bearing (7).

10. The pneumatic radial bearing assembly according to claim 9, characterized in that: The second internal passage includes a second air guide groove (501), a third air passage (502), a third air passage outlet (503), and a fourth air passage outlet (504). The second air guide groove (501) can introduce gas. The third air passage (502) is located in the inner circumference of the second air guide groove (501) and is communicated with the second air guide groove (501). The third air passage (502) has a distance greater than 0 from both axial end faces of the second radial bearing housing (5). The third air passage outlet (503) can be communicated with the third air passage (502) and can conduct gas to one axial end of the second radial bearing (7). The fourth air passage outlet (504) can also be communicated with the third air passage (502) and can conduct gas to the other axial end of the second radial bearing (7).

11. The pneumatic radial bearing assembly according to claim 10, characterized in that: The second internal passage further includes a fourth air passage (505). The fourth air passage (505) is located inside the second radial bearing housing (5) and extends along the axis of the second radial bearing housing (5). The fourth air passage outlet (504) extends along the radius of the second radial bearing housing (5). One axial end of the fourth air passage (505) is communicated with the third air passage outlet (503), and the other axial end of the fourth air passage (505) is communicated with the fourth air passage outlet (504). The third air passage outlet (503) penetrates to the inner circumferential surface of the central axis hole of the first radial bearing housing (4) and is located at one axial end of the second radial bearing (7) to conduct gas to one axial end of the second radial bearing (7). The fourth air passage outlet (504) penetrates to the inner circumferential surface of the central axis hole of the second radial bearing housing (5) and is located at the other axial end of the second radial bearing (7) to conduct gas to the other axial end of the second radial bearing (7).

12. A pneumatic bearing assembly, characterized in that: Comprising the pneumatic radial bearing assembly according to any one of claims 1-11, further comprising a pneumatic axial bearing assembly, the pneumatic axial bearing assembly being located on the axial side of the first radial bearing housing (4), and the gas in the first internal passage being able to be conducted to the pneumatic axial bearing assembly to provide support gas for the pneumatic axial bearing assembly.

13. The pneumatic bearing assembly according to claim 12, wherein: When further comprising a dispersed air passage outlet (406), the pneumatic axial bearing assembly comprises a first axial bearing (10), a thrust plate (12) and a second axial bearing (11), the first axial bearing (10) being located on the axial side of the thrust plate (12), the second axial bearing (11) being located on the other axial side of the thrust plate (12), and the second axial bearing (11) being opposite to the first radial bearing housing (4), and the second axial bearing (11) having an axially extending third air intake groove (116) thereon, the third air intake groove (116) being opposite to and communicating with the dispersed air passage outlet (406) so as to be able to introduce gas into the second axial bearing (11) to provide support gas.

14. An air suspension motor, characterized in that: Comprising the pneumatic bearing assembly according to claim 12 or 13, further comprising a housing (1), an air supply passage being provided inside the housing (1), the air supply passage being in communication with the first internal passage of the first radial bearing housing (4).

15. The air suspension motor according to claim 14, wherein: When further comprising a second radial bearing housing (5) and a second internal passage, the air supply passage is also in communication with the second internal passage on the second radial bearing housing (5).

16. A compressor, characterized in that: Comprising the air suspension motor according to claim 14 or 15.

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