Air bearing motor system

Abstract

The application provides an air floating motor system, which comprises a casing, a rotating shaft, a motor assembly, a primary compression assembly, a secondary compression assembly, a first radial bearing assembly, a second radial bearing assembly, an axial bearing assembly and a gas conducting channel. The interior of the casing is provided with a cooling channel. The gas conducting channel can introduce gas from the primary compression assembly and / or the secondary compression assembly, and after heat exchange with the cooling medium in the cooling channel, at least one of the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly and the axial bearing assembly is cooled. According to the application, the problems of bearing easy failure, serious motor heating and poor stability of the air floating high-speed motor and air compressor due to heating can be solved, and the operation reliability and service life of the air floating bearing high-speed motor and air compressor are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bearings, in particular to a gas bearing motor system. BACKGROUND

[0002] The gas bearing high-speed motor and air compressor have the characteristics of clean and oil-free, small size, high power density, high efficiency, and low noise. They provide high pressure ratio and large flow of oxygen for the internal reaction of fuel cell engines, improving the output efficiency and power of fuel cell engines, and are one of the important components of fuel cell engine systems.

[0003] The gas bearing high-speed motor and air compressor mainly include a shell, a stator and a rotating shaft. The shell is provided with a first bearing seat, a second bearing seat and a pneumatic assembly at both ends for supporting the rotating shaft. The foil gas dynamic pressure bearing of the support assembly of the rotating shaft is a key part that affects the running stability and service life of the air compressor. The foil gas dynamic pressure bearing absorbs gas in the wedge-shaped space through the high-speed rotating rotor to form a high-pressure gas film to support the rotating shaft and offset the load of the rotating shaft and suppress rotor vibration.

[0004] When the gas bearing high-speed motor and air compressor are working, the motor speed can reach tens of thousands of revolutions to hundreds of thousands of revolutions. Because the gap between the gas bearing and the motor rotor is very small when the gas bearing is working, the whole machine and the gas bearing and other parts generate a lot of heat. When the motor is impacted or in a high-temperature environment, the gas bearing is prone to failure, which can cause the whole machine to work abnormally. At present, the industry commonly increases the support stiffness and damping of the gas bearing to improve the bearing carrying capacity. For example, the utility model CN214945724U, named "Multi-layer wave foil impact-resistant axial dynamic pressure air bearing", installs at least double-layer wave foils on both sides of the bottom plate, and the wave foil away from the axial disc side is mainly used to buffer the impact of the shaft system, further improving the impact resistance of the axial bearing. However, when the stiffness of the gas bearing is too large, the deformation of the foil is very small when the bearing is impacted, and then the foil is in contact with the motor rotor and is severely worn or even causes the motor to fail. Therefore, the working state of the gas bearing under different loads needs to be considered in the design of the gas bearing to adjust its carrying capacity.

[0005] In addition, the air compressor can use a primary air guide to accelerate the air circulation system of the whole machine to improve the working stability of the bearing and avoid the failure of the gas bearing. For example, the utility model CN209781242U, named "Two-stage gas suspension centrifugal electric direct-drive air compressor", introduces part of the compressed gas into the machine shell assembly through the intermediate pipeline to cool the motor stator, main shaft, radial bearing and thrust bearing. However, the cooling effect of the gas bearing is quite limited due to the relatively high temperature of the primary air guide, and the gas bearing needs a better cooling method to prolong the service life.

[0006] The air-floating high-speed motor and air compressor in the prior art have the technical problems of bearing failure due to heat, serious motor heat and poor stability of the whole machine, and the air-floating motor system is designed. SUMMARY

[0007] Therefore, the technical problem to be solved by the present application is to overcome the defects of the air-floating high-speed motor and air compressor in the prior art, such as bearing failure due to heat, serious motor heat and poor stability of the whole machine, so as to provide an air-floating motor system.

[0008] In order to solve the above problems, the present application provides an air-floating motor system, which comprises:

[0009] The housing, the rotating shaft, the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly, the axial bearing assembly and the gas conducting channel, the primary compression assembly and the secondary compression assembly are connected to the rotating shaft to be driven by the rotating shaft, the first radial bearing assembly and the second radial bearing assembly can be supported on different shaft sections of the rotating shaft, the axial bearing assembly axially supports and thrusts the rotating shaft, the inside of the housing is provided with a cooling channel, the gas conducting channel can introduce gas from the primary compression assembly and / or the secondary compression assembly, and after heat exchange with the cooling medium in the cooling channel, at least one of the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly and the axial bearing assembly is cooled.

[0010] In some embodiments, the first radial bearing assembly comprises a primary radial bearing, the second radial bearing assembly comprises a secondary radial bearing, the primary radial bearing and the secondary radial bearing are supported on different shaft sections of the rotating shaft, and the axial bearing assembly comprises an axial bearing which can axially support or thrust the rotating shaft.

[0011] The motor assembly comprises a motor stator which can drive the rotating shaft to rotate, the primary compression assembly is arranged at one axial end of the rotating shaft, the secondary compression assembly is arranged at the other axial end of the rotating shaft, and the compressed gas of the primary compression assembly enters the secondary compression assembly for secondary compression.

[0012] In some embodiments, the first-stage compression assembly comprises a first-stage impeller, a first-stage diffuser and a first-stage volute, the first-stage impeller is fixed to one axial end of the rotating shaft to be rotated in the first-stage volute by the rotating shaft to compress the gas; the second-stage compression assembly comprises a second-stage impeller, a second-stage diffuser and a second-stage volute, the second-stage impeller is fixed to one axial end of the rotating shaft to be rotated in the second-stage volute by the rotating shaft to compress the gas, and the outlet end of the first-stage volute is communicated with the inlet end of the second-stage volute.

[0013] In some embodiments, the axial bearing assembly is arranged at a position adjacent to the first-stage compression assembly; the gas conducting channel comprises a casing air lead-in groove one arranged on the casing, one end of the casing air lead-in groove one is communicated with the inside of the second-stage volute to lead in the gas, the led-in gas can exchange heat with the cooling medium in the cooling channel in the casing air lead-in groove one, and the other end of the casing air lead-in groove one can lead the gas to the axial bearing assembly to cool the axial bearing assembly.

[0014] In some embodiments, the first radial bearing assembly is arranged at a position adjacent to the axial bearing assembly, and the second radial bearing assembly is arranged at a position adjacent to the second-stage compression assembly.

[0015] The cooling channel is a ring-shaped, arc-shaped or spiral-shaped structure formed on the casing, the gas conducting channel comprises a casing air lead-in groove two arranged on the casing, one end of the casing air lead-in groove two is communicated with the inside of the axial bearing assembly to lead in the gas, the led-in gas can exchange heat with the cooling medium in the cooling channel in the casing air lead-in groove two, and the other end of the casing air lead-in groove two can lead the gas to the second radial bearing assembly to cool the second radial bearing assembly; the inside of the axial bearing assembly is also communicated with the first radial bearing assembly to lead in the gas to cool the first radial bearing assembly.

[0016] In some embodiments, one end of the inside of the second radial bearing assembly is communicated with the casing air lead-in groove two, and the other end can be communicated with the inside of the casing, and the casing further comprises a casing air lead-in groove, one end of the casing air lead-in groove is communicated with the casing air lead-in groove two, and the other end is communicated with the inside of the casing, so that part of the gas in the casing air lead-in groove two can be led into the inside of the casing through the casing air lead-in groove.

[0017] In some embodiments, the casing is further provided with a casing air outlet groove, one end of the casing air outlet groove is in communication with the inside of the casing, and the other end of the casing air outlet groove is capable of guiding the gas out of the casing to the secondary compression assembly, the casing air outlet groove is arranged close to the first radial bearing assembly relative to the second radial bearing assembly, the gas entering the inside of the casing through the second radial bearing assembly and the gas entering the inside of the casing through the casing air outlet groove can be mixed in the inside of the casing and can cool the motor stator, and the mixed gas and the gas entering the inside of the casing through the first radial bearing assembly can be mixed and discharged through the casing air outlet groove.

[0018] In some embodiments, the first radial bearing assembly further comprises a first radial bearing seat, the first radial bearing is supported on the outer periphery of the rotating shaft, the first radial bearing seat is supported on the radial outer periphery of the first radial bearing, and the first radial bearing seat is provided with a first radial bearing seat air guide groove one, a first radial bearing seat air guide groove two and a first radial bearing seat air outlet groove;

[0019] The first volute is further provided with a first volute air outlet groove, the casing air outlet groove, the first radial bearing seat air outlet groove and the first volute air outlet groove are in communication, and the gas bearing motor system further comprises a connecting pipe, one end of the connecting pipe is in communication with the first volute air outlet groove, and the other end of the connecting pipe is in communication with the secondary compression assembly;

[0020] One end of the first radial bearing seat air guide groove one is in communication with the casing air guide groove one, and the other end of the first radial bearing seat air guide groove one is in communication with the axial bearing assembly, one end of the first radial bearing seat air guide groove two is in communication with the casing air guide groove two, and the other end of the first radial bearing seat air guide groove two is in communication with the axial bearing assembly.

[0021] In some embodiments, the second radial bearing assembly further comprises a second radial bearing seat, the second radial bearing is supported on the outer periphery of the rotating shaft, the second radial bearing seat is supported on the radial outer periphery of the second radial bearing, and the second radial bearing seat is provided with a second radial bearing seat air guide groove one and a second radial bearing seat air guide groove two;

[0022] One end of the second radial bearing seat air guide groove one is in communication with the inside of the second volute, and the other end of the second radial bearing seat air guide groove one is in communication with the casing air guide groove one, one end of the second radial bearing seat air guide groove two is in communication with the casing air guide groove two, and the other end of the second radial bearing seat air guide groove two is in communication with the second radial bearing assembly.

[0023] In some embodiments, the axial bearing assembly is arranged at a position adjacent to the primary compression assembly; the gas conducting channel comprises a casing air lead-in groove one arranged on the casing, one end of the casing air lead-in groove one being in communication with the interior of the primary volute for leading in gas, the led-in gas being capable of exchanging heat with the cooling medium in the cooling channel, the other end of the casing air lead-in groove one being capable of leading the gas to the second radial bearing assembly for cooling the second radial bearing assembly; the interior of the axial bearing assembly is also in communication with the interior of the primary volute for leading in gas to cool and dissipate heat for the axial bearing assembly; the interior of the axial bearing assembly is also in communication with the first radial bearing assembly for leading in gas to cool and dissipate heat for the first radial bearing assembly.

[0024] In some embodiments, one end of the interior of the second radial bearing assembly is in communication with the casing air lead-in groove one, and the other end is capable of being in communication with the interior of the casing, and the casing further comprises a casing air guide groove, one end of the casing air guide groove being in communication with the casing air lead-in groove one, and the other end being in communication with the interior of the casing, so that part of the gas in the casing air lead-in groove one can also be led into the interior of the casing through the casing air guide groove.

[0025] In some embodiments, the casing further comprises a casing air exhaust groove, one end of the casing air exhaust groove being in communication with the interior of the casing, and the other end being capable of leading the gas out to the outside, the casing air exhaust groove being arranged close to the first radial bearing assembly relative to the second radial bearing assembly, the gas entering the interior of the casing through the second radial bearing assembly and the gas entering the interior of the casing through the casing air guide groove can be mixed in the interior of the casing and can cool the motor stator, and the mixed gas and the gas entering the interior of the casing through the first radial bearing assembly can be mixed and exhausted through the casing air exhaust groove.

[0026] In some embodiments, the first radial bearing assembly further comprises a primary radial bearing seat, the primary radial bearing being supported on the outer periphery of the rotating shaft, the primary radial bearing seat being supported on the radial outer periphery of the primary radial bearing,

[0027] the second radial bearing assembly further comprises a secondary radial bearing seat, the secondary radial bearing being supported on the outer periphery of the rotating shaft, the secondary radial bearing seat being supported on the radial outer periphery of the secondary radial bearing,

[0028] and a primary radial bearing seat air guide groove one is formed in the primary radial bearing seat;

[0029] one end of the primary radial bearing seat air guide groove one being in communication with the casing air lead-in groove one, and the other end being in communication with the interior of the primary volute.

[0030] In some embodiments, the second radial bearing seat is provided with a second radial bearing seat air guide groove one;

[0031] One end of the second radial bearing seat air guide groove one is in communication with the casing air guide groove two, and the other end is in communication with the second radial bearing assembly.

[0032] In some embodiments, the axial bearing comprises an axial flat foil, an axial wave foil and an axial bottom sheet, the axial wave foil is located between the axial flat foil and the axial bottom sheet, the axial flat foil comprises an axial flat foil flat section, an axial flat foil inclined section and an axial flat foil bearing section, the axial wave foil comprises an axial wave foil flat section and an axial wave foil support section, the axial wave foil support section protrudes towards the axial flat foil bearing section relative to the axial wave foil flat section, and the axial wave foil support section comprises a first wave foil support section and a second wave foil support section with different protruding heights in the axial direction.

[0033] In some embodiments, a spacing groove is formed in the position of the axial wave foil support section in the circumferential direction to separate the axial wave foil support section into different support sections, and the spacing groove is multiple, and the multiple spacing grooves are sequentially and spacedly arranged in the radial direction, so that the axial wave foil support section is separated into the first wave foil support sections located at the radially outermost side and the radially innermost side, and the second wave foil support sections located between adjacent two spacing grooves.

[0034] In some embodiments, the spacing groove is 3, the axial wave foil support section is separated into two first wave foil support sections located at the radially outermost side and the radially innermost side, and 3 second wave foil support sections located between adjacent two spacing grooves; and / or the protruding height of the second wave foil support section is higher than the protruding height of the first wave foil support section.

[0035] In some embodiments, the axial bearing assembly further comprises an axial disc, an axial one end of a radially inner side of the axial disc is in contact with a thrust surface of the rotating shaft, an axial one end of a radially outer side of the axial disc is provided with one of the axial bearings, which is a front axial bearing, an axial other end of the radially outer side of the axial disc is provided with another one of the axial bearings, which is a rear axial bearing;

[0036] The axial bearing assembly further comprises an axial gap adjusting ring, the axial gap adjusting ring is arranged on the radially outer side of the axial disc and located between the front axial bearing and the rear axial bearing, and the gap δ between the axial disc and the axial bearing can be adjusted through the axial gap adjusting ring.

[0037] In some embodiments, the axial gap adjusting ring has an axial thickness of H, the axial bearing has an axial total height of T, each foil has an axial thickness of t, the axial disk has an axial thickness of h, and the adjustable gap between the shaft and the axial bearing is 2δ = H + 2t - h - 2T.

[0038] In some embodiments, the primary radial bearing and the secondary radial bearing have the same structure, and each is a radial bearing including a radial base sheet, a radial first layer of wave foils, a radial second layer of wave foils, a radial first layer of flat foils, a radial second layer of flat foils, and a radial third layer of flat foils, which are arranged in sequence in a radially inward direction.

[0039] In some embodiments, the radial first layer of wave foils has a smaller arch height than the radial second layer of wave foils, and a radial wave foil gap is formed between the radial first layer of wave foils and the radial second layer of wave foils.

[0040] The radial second layer of flat foils is not a full circle, and a radial flat foil gap is formed between the radial first layer of flat foils and the radial third layer of flat foils at the position where the radial second layer of flat foils is not present.

[0041] When the shaft is in operation, a rotor bearing gap is formed between the radial third layer of flat foils and the shaft.

[0042] In some embodiments, the arch height h1 of the radial first layer of wave foils is 60%-80% of the arch height h2 of the radial second layer of wave foils.

[0043] In some embodiments, the radial first layer of wave foils and the radial second layer of wave foils are each arranged in a multi-segment structure in the axial direction, and at least one of the arch height, the pitch, and the chord length is different between segments.

[0044] In some embodiments, the radial first layer of wave foils includes a radial first layer of wave foils first segment, a radial first layer of wave foils second segment, a radial first layer of wave foils third segment, and a radial first layer of wave foils fourth segment, the radial first layer of wave foils first segment, the radial first layer of wave foils third segment, and the radial first layer of wave foils fourth segment are sequentially connected in a circumferential direction, and the radial first layer of wave foils second segment includes at least two segments, one of which is arranged on one axial side of the radial first layer of wave foils third segment and spaced apart therefrom, and the other of which is arranged on the other axial side of the radial first layer of wave foils third segment and spaced apart therefrom.

[0045] In some embodiments, the first radial first-layer wave foil first section is arranged axially in at least two, one of which has a circumferential one end portion connected to the one of the second radial first-layer wave foil section and a circumferential another end portion connected to the third radial first-layer wave foil section, and another of which has a circumferential one end portion connected to the another of the second radial first-layer wave foil section and a circumferential another end portion connected to the third radial first-layer wave foil section.

[0046] The fourth radial first-layer wave foil section is arranged axially in at least two, one of which has a circumferential one end portion connected to the one of the second radial first-layer wave foil section and a circumferential another end portion connected to the third radial first-layer wave foil section, and another of which has a circumferential one end portion connected to the another of the second radial first-layer wave foil section and a circumferential another end portion connected to the third radial first-layer wave foil section.

[0047] In some embodiments, the radial first-layer wave foil comprises a first radial first-layer wave foil section, a second radial first-layer wave foil section, a third radial first-layer wave foil section and a fourth radial first-layer wave foil section, the first radial first-layer wave foil section, the third radial first-layer wave foil section and the fourth radial first-layer wave foil section are arranged axially in sequence with a spacing, the arch height of the first radial first-layer wave foil section is arranged axially staggered with the arch height of the second radial first-layer wave foil section, and the arch height of the third radial first-layer wave foil section and the fourth radial first-layer wave foil section are arranged axially staggered.

[0048] The gas bearing motor system provided by the present application has the following advantages:

[0049] 1.The application is characterized in that a cooling flow channel is arranged inside the casing in a two-stage or multi-stage compression system, cooling medium is introduced into the cooling flow channel, and gas in a primary compression assembly and / or a secondary compression assembly can be introduced through a gas guide passage to exchange heat with the medium in the cooling flow channel to cool the introduced gas, and the cooled gas is further sent to at least one of a motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly and the axial bearing assembly to effectively cool at least one of the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly and the axial bearing assembly; the whole machine thermal management system effectively cools the key components of the motor by reasonably arranging the gas circulation cooling flow channel, reduces the gas supply outside the motor compared with the original technology, effectively cools the key components of the motor, reduces the temperature rise of the motor, the axial rotating system and the radial rotating system, improves the cooling efficiency of the whole machine, solves the problems of bearing failure, serious motor heating and poor stability of the whole machine caused by heating of the air floating high-speed motor and air compressor, and improves the operation reliability and service life of the air floating bearing high-speed motor and air compressor.

[0050] 2.The application is characterized in that the axial bearing assembly adopts an E open-loop wave foil structure (the interval groove is divided into multiple wave foil support sections), which can effectively reduce the support stiffness of the bearing area; a flat foil design adjustment structure is arranged, which can reduce the gas film height at the entrance of the inclined surface and improve the bearing capacity of the axial bearing; an axial gap adjustment ring is arranged between the axial bearing assemblies, and the axial gap adjustment ring is provided with a gas passage to realize precise adjustment of the axial gap and effective cooling of the axial bearing; the radial bearing assembly adopts a double-layer wave foil and multi-layer flat foil structure, the wave foils are staggered along the axial direction and present an electric resistance Ω or E-shaped groove structure along the circumferential direction to improve the bearing capacity of the radial bearing and the self-adaptability and operation stability of the radial rotating system; and a spacer is arranged at the free end and the fixed end of the foil of the radial bearing assembly to simplify the bearing fixing mode. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is a sectional view of the air floating motor system (air floating high-speed motor and air compressor) of the application;

[0052] Figure 2 is a sectional view of the axial rotating system (axial bearing assembly part) in the air floating motor system of the application;

[0053] Figure 3 is a three-dimensional development view of the axial bearing in the axial rotating system in the air floating motor system of the application;

[0054] Figure 4 is an assembly structure schematic view of the axial bearing in the air floating motor system of the application;

[0055] Figure 5 is the axial bearing assembly structure schematic diagram in the air floating motor system of the present application without flat foil;

[0056] Figure 6 is the axial bearing E open loop wave foil structure schematic diagram in the air floating motor system of the present application;

[0057] Figure 7 is the axial bearing bottom sheet schematic diagram in the air floating motor system of the present application;

[0058] Figure 8 is the axial bearing sectional structure local enlarged view in the air floating motor system of the present application;

[0059] Figure 9 is the axial gap adjusting ring structure schematic diagram in the air floating motor system of the present application;

[0060] Figure 10 is the axial gap adjusting ring sectional structure schematic diagram in the air floating motor system of the present application;

[0061] Figure 11 is the axial rotating system gas gap adjusting structure schematic diagram in the air floating motor system of the present application;

[0062] Figure 12 is the radial rotating system sectional structure schematic diagram in the air floating motor system of the present application;

[0063] Figure 13 is the radial rotating system radial bearing preferred structure schematic diagram in the air floating motor system of the present application;

[0064] Figure 14 is the radial bearing preferred structure fixed end enlarged schematic diagram in the air floating motor system of the present application;

[0065] Figure 15 is the radial bearing preferred structure local enlarged schematic diagram in the air floating motor system of the present application;

[0066] Figure 16 is the radial bearing wave foil preferred structure unfolded schematic diagram in the air floating motor system of the present application;

[0067] Figure 17 is the radial bearing wave foil preferred structure bending schematic diagram in the air floating motor system of the present application;

[0068] Figure 18 is the radial bearing wave foil alternative structure unfolded schematic diagram in the air floating motor system of the present application;

[0069] Figure 19 is the radial bearing wave foil alternative structure bending schematic diagram in the air floating motor system of the present application;

[0070] Figure 20 The preferred gas cooling flow channel profile structure of the air bearing air compressor in the air floating motor system of the present application Figure 1 ;

[0071] Figure 21 The preferred gas cooling flow channel profile structure of the air bearing air compressor in the air floating motor system of the present application Figure 2 ;

[0072] Figure 22 The preferred gas cooling flow channel profile structure of the air bearing air compressor in the air floating motor system of the present application

[0073] Reference signs are:

[0074] 1, housing; 2, stator; 3, rotating shaft (or motor rotor); 4, primary radial bearing seat; 5, secondary radial bearing seat; 6, radial bearing; 6a, primary radial bearing; 6b, secondary radial bearing; 7, axial disc; 8, axial bearing; 9, axial gap adjusting ring; 10, primary diffuser; 11, secondary diffuser; 12, primary impeller; 13, secondary impeller; 14, primary volute; 15, secondary volute;

[0075] 81, axial flat foil; 811, axial flat foil flat section; 812, axial flat foil inclined section; 813, axial flat foil bearing section; 814, axial flat foil adjusting structure; 815, flat foil pin hole; 82, axial first layer gasket; 821, first layer gasket flat section; 822, axial first layer gasket support section; 823, first layer gasket pin hole; 83, axial second layer gasket; 831, second layer gasket flat section; 832, second layer gasket support section; 833, second layer gasket pin hole; 84, axial wave foil; 841, axial wave foil flat section; 842, axial wave foil support section; 8421, first wave foil support section; 8422, second wave foil support section; 843, wave foil pin hole; 845, wave foil clamping groove; 846, spacing groove; 85, axial bottom sheet; 851, axial bottom sheet flat section; 852, axial bottom sheet clamping groove; 853, axial bottom sheet adjusting structure; 854, bottom sheet pin hole;

[0076] 911, axial adjusting ring gap section; 912, axial adjusting ring support section; 913, axial adjusting ring positioning hole;

[0077] 20, radial gasket; 21, radial retainer ring;

[0078] 61, radial bottom sheet; 62, radial first layer wave foil; 63, radial second layer wave foil; 64, radial first layer flat foil; 65, radial second layer flat foil; 66, radial third layer flat foil; 67, radial U-shaped groove;

[0079] 611, radial bottom sheet fixed end; 612, radial bottom sheet support section; 613, radial bottom sheet free end; 621, radial first layer wave foil fixed end; 622a, radial first layer wave foil support section; 631, radial second layer wave foil fixed end; 635, radial second layer wave foil support section; 636, radial second layer wave foil free end; 641, radial first layer flat foil fixed end; 642, radial first layer flat foil support end; 643, radial first layer flat foil free end; 651, radial second layer flat foil fixed end; 652, radial second layer flat foil support end; 661, radial third layer flat foil fixed end; 662, radial third layer flat foil support end; 663, radial third layer flat foil free end; 671, radial U-shaped slot fixed end; 672, radial U-shaped slot free end;

[0080] 601, radial wave foil gap; 602, radial flat foil gap; 603, rotor bearing gap;

[0081] 621, radial first layer wave foil fixed end; 622, radial first layer wave foil first section; 623, radial first layer wave foil second section; 624, radial first layer wave foil third section; 625, radial first layer wave foil fourth section; 626, radial first layer wave foil free end;

[0082] 101, cooling channel; 102, casing air channel one; 103, casing air channel two; 104, casing air guide channel; 401, primary radial bearing seat air guide channel one; 402, primary radial bearing seat air guide channel two; 5, secondary radial bearing seat; 501, secondary radial bearing seat air guide channel one; 502, secondary radial bearing seat air guide channel two; 111, secondary diffuser air guide channel one; 112, secondary diffuser air guide channel two; 105, casing exhaust channel; 403, primary radial bearing seat exhaust channel; 141, primary volute exhaust channel; 16, connecting pipe. DETAILED DESCRIPTION

[0083] As Figures 1-22 shown, the present application provides an air floating motor system, which comprises:

[0084] The shell 1, the rotating shaft 3, the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly, the axial bearing assembly and the gas conducting passage, the primary compression assembly and the secondary compression assembly are connected with the rotating shaft 3 to be driven by the rotating shaft 3 respectively, the first radial bearing assembly and the second radial bearing assembly are supported on different shaft sections of the rotating shaft 3 respectively, the axial bearing assembly axially supports and thrusts the rotating shaft 3, the inside of the shell 1 is provided with a cooling passage 101, the gas conducting passage can introduce gas from the primary compression assembly and / or the secondary compression assembly, and after heat exchange with the cooling medium in the cooling passage 101, at least one of the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly and the axial bearing assembly is cooled.

[0085] The application sets the cooling flow channel in the shell in the two-stage or multi-stage compression system, the cooling medium is introduced into the cooling flow channel, and the gas in the primary compression assembly and / or the secondary compression assembly can be introduced through the gas conducting passage, heat exchange is carried out with the medium in the cooling flow channel in the shell, the introduced gas is cooled, and the cooled gas is further sent to at least one of the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly and the axial bearing assembly, so that at least one of the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly and the axial bearing assembly is effectively cooled, the whole machine heat management system is arranged by reasonably arranging the gas circulation cooling flow channel, compared with the original technology, the gas supply outside the motor is not needed, the gas cooling joint is reduced, the cooling of the key parts of the motor is effectively realized, the temperature rise of the motor, the axial rotating system and the radial rotating system is reduced, the cooling efficiency of the whole machine is improved, the problems of bearing failure, serious motor heating and poor stability of the whole machine due to heating of the air floating high-speed motor and the air compressor are solved, and the operation reliability and service life of the air floating bearing high-speed motor and the air compressor are improved.

[0086] In some embodiments, the first radial bearing assembly includes a primary radial bearing 6a, the second radial bearing assembly includes a secondary radial bearing 6b, the primary radial bearing 6a and the secondary radial bearing 6b are supported on different shaft sections of the rotating shaft 3 respectively, and the axial bearing assembly includes an axial bearing 8 which axially supports or thrusts the rotating shaft 3.

[0087] The motor assembly comprises a motor stator 2 capable of driving the rotation of the rotating shaft 3; the first-stage compression assembly is arranged at one axial end of the rotating shaft 3, and the second-stage compression assembly is arranged at the other axial end of the rotating shaft 3; the compressed gas of the first-stage compression assembly enters the second-stage compression assembly for second-stage compression.

[0088] This is the preferred structure of the first radial bearing assembly and the second radial bearing assembly of the present application, and the preferred structure of the axial bearing assembly, and the compressed gas of the first-stage compression assembly of the present application can enter the second-stage compression assembly for second-stage compression, forming a two-stage compression compression system.

[0089] In some embodiments, the first-stage compression assembly comprises a first-stage impeller 12, a first-stage diffuser 10 and a first-stage volute 14, the first-stage impeller 12 is fixedly connected with one axial end of the rotating shaft 3, so as to be driven to rotate in the first-stage volute 14 by the rotation of the rotating shaft 3, thereby compressing the gas; the second-stage compression assembly comprises a second-stage impeller 13, a second-stage diffuser 11 and a second-stage volute 15, the second-stage impeller 13 is fixedly connected with one axial end of the rotating shaft 3, so as to be driven to rotate in the second-stage volute 15 by the rotation of the rotating shaft 3, thereby compressing the gas, and the outlet end of the first-stage volute 14 is in communication with the inlet end of the second-stage volute 15.

[0090] This is the preferred structure of the first-stage and second-stage compression assemblies of the present application, and the impeller can drive the gas to be compressed and speeded up in the volute, and the diffuser can increase the pressure.

[0091] The present application provides a gas bearing high-speed motor and air compressor, which comprises a casing 1, a stator 2, a motor rotor (rotating shaft 3), a first-stage radial bearing seat 4 and a second-stage radial bearing seat 5 arranged on the two sides of the casing respectively, and a radial bearing 6 for supporting the motor rotor. An axial disc 7 is arranged on one end of the motor rotor, axial bearings 8 are arranged on the left and right sides of the axial disc respectively, and are used to limit the axial displacement of the motor rotor. An axial gap adjusting ring 9 is arranged between the outside of the axial disc and the front and rear axial bearings, and is used to adjust the gap size between the axial bearings and the axial disc. In addition, a first-stage diffuser 10 and a second-stage diffuser 11 are arranged outside the first-stage radial bearing seat and the second-stage radial bearing seat respectively, a first-stage impeller 12 and a second-stage impeller 13 are arranged at the two ends of the motor rotor respectively, and a first-stage volute 14 and a second-stage volute 15 are arranged outside the first-stage diffuser and the second-stage diffuser respectively. A connecting pipe 16 is arranged between the first-stage volute and the second-stage volute, as shown in the prior art Figure 1 .

[0092] Thermal management of the gas bearing air compressor system of the present application Figure 20The system comprises a motor, an axial rotation system, a radial rotation system, and pneumatic components. The thermal management system introduces high-pressure gas from the secondary volute into the axial rotation system via the housing cooling duct. After cooling the axial bearing and rotor axial disc, a portion flows into the primary stator coil via the front radial bearing; another portion enters the end cover air passage through the axial clearance adjustment ring, then flows through the housing cooling duct, partially entering the secondary stator coil, and the remaining portion flows through the secondary diffuser duct, through the rear radial bearing air gap, into the secondary stator coil. Both portions then flow through the rotor air gap into the primary stator coil. Finally, the high-pressure gas in the last stage stator coil enters the connecting pipe through the front cover duct and re-enters the secondary volute for circulation. In an alternative configuration, the overall thermal management system directs high-pressure gas from the primary volute into the secondary stator coil via the housing cooling duct, while another portion flows through the secondary diffuser duct, through the rear radial bearing air gap, into the secondary stator coil. Both portions then flow through the rotor air gap into the primary stator coil, where they are discharged from the motor along with leaked gas from the primary side. The overall thermal management system, through the rational arrangement of gas circulation cooling channels, eliminates the need for external air supply to the motor and reduces air cooling joints compared to the original technology. This achieves cooling of key motor components, reduces the temperature rise of the motor, axial rotation system, and radial rotation system, and improves the overall cooling efficiency of the machine.

[0093] Example 1, as Figures 20-21 As shown, in some embodiments, the axial bearing assembly is positioned in contact with the primary compression assembly; the gas conduction channel includes a housing air vent 102 disposed on the housing 1, one end of which communicates with the interior of the secondary volute 15 to introduce gas. The introduced gas can exchange heat with the cooling medium in the cooling channel 101 within the housing air vent 102, and the other end of which can guide the gas to the axial bearing assembly for cooling. This invention, through the housing air vent 102 disposed on the housing, allows gas from the secondary volute to be introduced through the housing air vent 102 and exchange heat with the cooling channel, thereby guiding the cooled gas to the axial bearing assembly for cooling.

[0094] In the process of high-speed operation of the air compressor, the motor rotor and air friction generate wind friction loss, and a large amount of heat is accumulated near the air floating bearing. The temperature rise of the air floating bearing will affect the stable performance of the air compressor. In order to solve the cooling problem of the whole machine, the air floating motor and the whole machine thermal management of the air compressor of the original technology are analyzed, including the motor, the axial rotating system, the radial rotating system and the pneumatic assembly. Among them, the pneumatic assembly includes a first impeller 12, a second impeller 13, a first volute 14, a second volute 15 and a connecting pipe 16. When the first impeller 12 and the second impeller 13 rotate on the rotating shaft 3, the gas entering the first volute 14 and the second volute 15 is worked on respectively to generate high-temperature and high-pressure gas. The high-temperature and high-pressure gas is introduced into the motor casing for cooling to obtain low-temperature and high-pressure gas. The gas is introduced into the motor for circulation to cool the motor system, the axial rotating system and the radial rotating system.

[0095] The preferred gas cooling flow channel structure of the air floating motor and the whole machine thermal management of the air compressor of the present application is shown as Figure 20 and Figure 21 In the present example, the high-pressure gas compressed by the second volute 15 is introduced into the casing 1 through the second diffuser guide groove one 111 of the second diffuser 11 and the second radial bearing seat guide groove one 501 of the second radial bearing seat 5. The spiral or return type cooling channel 101 is arranged on the casing 1. The high-pressure gas is efficiently cooled by circulating water in the casing guide groove one 102. The high-pressure gas is introduced into the axial rotating system through the first radial bearing seat guide groove one 401 of the first radial bearing seat 4. The cooled high-pressure gas flows to the axial bearing 8 and the axial disc 7 of the motor rotor through the axial gap section 911 of the axial adjusting ring. The convection heat dissipation capacity of the air at the bearing is enhanced by the high-pressure gas, and the heat generated by the axial disc 7 and the front and rear axial bearings 8 on the motor rotor is taken away. The air floating bearing and the axial disc 7 operate at a lower temperature, and the bearing wear and failure are reduced. Part of the low-temperature gas flows through the gas gap between the rotating shaft 3 and the first side radial bearing 6 and cools the front radial rotating system, and enters the motor first side stator winding. Another part of the high-pressure gas flows into the casing guide groove two 103 of the casing again through the gap section of the axial gap adjusting ring 9 and the first radial bearing seat guide groove two 402 of the first radial bearing seat. Part of the gas enters the motor second side stator winding through the casing guide groove 104 of the inner wall of the casing 1, cools the stator winding, and the remaining cooling gas enters the gas gap between the rotating shaft 3 and the second side radial bearing 6 through the second radial bearing seat guide groove two 502 of the second radial bearing seat 5 and the second diffuser guide groove two 112 of the second diffuser 11, cools the rear radial rotating system, and the two parts of gas enter the first side motor winding through the rotor air gap. Finally, the high-pressure gas of the first side stator winding enters the connecting pipe through the casing guide groove 104 of the casing 1, the first radial bearing seat exhaust groove 403 and the first volute exhaust groove 141, and enters the second volute for compression and circulation again.

[0096] In the present example, because the flow resistance of high pressure gas flowing through the second-stage radial bearing seat gas guide groove two 502 and the second-stage diffuser gas guide groove two 112 is larger than that of the casing gas guide groove two 103, in order to ensure that the high pressure gas passes through the casing gas guide groove two 103 and the second-stage diffuser gas guide groove two 112 respectively, the structure size of the two gas guide grooves should satisfy that the cross-sectional area of the second-stage diffuser gas guide groove two 112 is between 150% and 300% of the cross-sectional area of the casing gas guide groove two 103.

[0097] The present example forms two self-circulation ventilation cooling structures through the ventilation flow path design of the whole machine under the condition of not introducing an external air source or increasing the structural complexity of the whole machine, and efficiently cools the axial rotating system, the radial rotating system, and key parts such as the motor stator and rotor, improves the efficiency of the whole machine under the premise of not losing aerodynamic performance, prolongs the service life of the motor, and improves the safety and reliability of the air compressor.

[0098] In some embodiments, the first radial bearing assembly is arranged at a position connected to the axial bearing assembly, and the second radial bearing assembly is arranged at a position connected to the two-stage compression assembly.

[0099] The cooling channel 101 is a ring-shaped, arc-shaped or spiral-shaped structure formed on the casing 1, and the gas guide channel includes a casing gas guide groove two 103 arranged on the casing 1. One end of the casing gas guide groove two 103 is in communication with the inside of the axial bearing assembly to introduce gas. The introduced gas can exchange heat with the cooling medium in the cooling channel 101 in the casing gas guide groove two 103. The other end of the casing gas guide groove two 103 can guide the gas to the second radial bearing assembly to cool the second radial bearing assembly. The inside of the axial bearing assembly is also in communication with the first radial bearing assembly to introduce gas to cool the first radial bearing assembly.

[0100] The present application can also introduce the gas cooled by the axial bearing assembly into the casing gas guide groove two formed on the casing, exchange heat with the cooling channel, and then guide the gas to the second radial bearing assembly to cool the second radial bearing assembly. At the same time, the axial bearing assembly can also communicate with the first radial bearing assembly to introduce cooling gas, thereby achieving the cooling effect of the axial bearing assembly, the first and second radial bearing assemblies.

[0101] In some embodiments, one end of the second radial bearing assembly is in communication with the casing air guide groove two 103, and the other end is capable of being in communication with the inside of the casing 1. The casing 1 is further provided with a casing air guide groove 104, one end of which is in communication with the casing air guide groove two 103, and the other end is in communication with the inside of the casing 1. Therefore, part of the gas in the casing air guide groove two 103 can also be introduced into the inside of the casing 1 through the casing air guide groove 104. The gas in the inside of the second radial bearing assembly can be introduced into the inside of the casing through the setting form of the second radial bearing assembly, so as to cool the motor stator and the like in the inside of the casing. In order to improve the heat dissipation effect of the motor stator, the casing air guide groove is arranged on the casing, and the gas can be directly introduced from the casing air guide groove two, so as to prevent the temperature of the gas after heat exchange through the second radial bearing assembly from being too high and affecting the heat dissipation of the motor.

[0102] In some embodiments, the casing 1 is further provided with a casing air exhaust groove 105, one end of which is in communication with the inside of the casing 1, and the other end is capable of guiding the gas out of the secondary compression assembly. The casing air exhaust groove 105 is arranged close to the first radial bearing assembly relative to the second radial bearing assembly. The gas in the inside of the casing 1 through the second radial bearing assembly and the gas in the inside of the casing 1 through the casing air guide groove 104 can be mixed in the inside of the casing 1, and can cool the motor stator 2. The mixed gas and the gas in the inside of the casing 1 through the first radial bearing assembly can be mixed, and can be discharged through the casing air exhaust groove 105.

[0103] The gas in the inside of the casing after heat exchange can be guided out of the casing and into the secondary volute through the casing air exhaust groove arranged on the casing, so as to form a self-circulation process. The gas in the system itself can be used to effectively cool and dissipate heat of multiple components (including the motor, axial bearing, radial bearing and the like) in the system.

[0104] In some embodiments, the first radial bearing assembly further comprises a primary radial bearing seat 4, the primary radial bearing 6a is supported on the outer periphery of the rotating shaft 3, the primary radial bearing seat 4 is supported on the radial outer periphery of the primary radial bearing 6a, and the primary radial bearing seat 4 is provided with a primary radial bearing seat air guide groove one 401, a primary radial bearing seat air guide groove two 402 and a primary radial bearing seat air exhaust groove 403.

[0105] The primary volute 14 is further provided with a primary volute exhaust groove 141, the casing exhaust groove 105, the primary radial bearing seat exhaust groove 403 and the primary volute exhaust groove 141 are communicated, and the air floating motor system further comprises a connecting pipe 16, one end of the connecting pipe 16 is communicated with the primary volute exhaust groove 141, and the other end is communicated to the secondary compression assembly.

[0106] One end of the primary radial bearing seat air guide groove one 401 is communicated with the casing air guide groove one 102, and the other end is communicated with the axial bearing assembly, one end of the primary radial bearing seat air guide groove two 402 is communicated with the casing air guide groove two 103, and the other end is communicated with the axial bearing assembly.

[0107] The primary volute 14 is further provided with a primary volute exhaust groove 141, the primary radial bearing seat exhaust groove 403 and the primary volute exhaust groove 141 are communicated, and the air floating motor system further comprises a connecting pipe 16, one end of the connecting pipe 16 is communicated with the primary volute exhaust groove 141, and the other end is communicated to the secondary compression assembly.

[0108] In some embodiments, the second radial bearing assembly further comprises a secondary radial bearing seat 5, the secondary radial bearing 6b is supported on the outer periphery of the rotating shaft 3, the secondary radial bearing seat 5 is supported on the radial outer periphery of the secondary radial bearing 6b, and the secondary radial bearing seat 5 is provided with a secondary radial bearing seat air guide groove one 501 and a secondary radial bearing seat air guide groove two 502;

[0109] One end of the secondary radial bearing seat air guide groove one 501 is communicated with the inside of the secondary volute 15, and the other end is communicated with the casing air guide groove one 102, one end of the secondary radial bearing seat air guide groove two 502 is communicated with the casing air guide groove two 103, and the other end is communicated with the second radial bearing assembly.

[0110] The primary volute 14 is further provided with a primary volute exhaust groove 141, the primary radial bearing seat exhaust groove 403 and the primary volute exhaust groove 141 are communicated, and the air floating motor system further comprises a connecting pipe 16, one end of the connecting pipe 16 is communicated with the primary volute exhaust groove 141, and the other end is communicated to the secondary compression assembly.

[0111] Example 2, as Figure 22In some embodiments, the axial bearing assembly is arranged at a position connected to the primary compression assembly; the gas conducting channel comprises a casing air guide groove one 102 arranged on the casing 1, one end of the casing air guide groove one 102 is connected to the inside of the primary volute 14 to introduce gas, the introduced gas can exchange heat with the cooling medium in the cooling channel 101 in the casing air guide groove one 102, the other end of the casing air guide groove one 102 can guide the gas to the second radial bearing assembly to cool the second radial bearing assembly; the inside of the axial bearing assembly is also connected to the inside of the primary volute 14 to introduce gas to cool the axial bearing assembly; the inside of the axial bearing assembly is also connected to the first radial bearing assembly to introduce gas to cool the first radial bearing assembly. The gas in the primary volute can be introduced into the casing air guide groove through the casing air guide groove to exchange heat with the cooling channel, and the cooled and cooled gas can be guided to the second radial bearing assembly to cool it, and the axial bearing assembly can also be connected to the primary volute to introduce the cooling gas, so as to complete the cooling and cooling effect of the axial bearing assembly, the first radial bearing assembly.

[0112] The alternative gas cooling flow channel structure of the air floating motor and the air compressor machine whole machine heat management of the application is shown in Figure 22 The high-pressure gas compressed by the primary volute 14 is introduced into the casing air guide groove one 102 through the primary diffuser air guide groove and the primary radial bearing seat air guide groove one 401, the spiral or return type cooling channel 101 is arranged on the casing 1, and the high-pressure gas is efficiently cooled by the cooling circulating water in the casing air guide groove one 102. A part of the cooled high-pressure gas enters the stator cavity through the casing air guide groove 104 in the inner wall of the casing 1 to cool the secondary side stator coil, the temperature drop of the stator coil enhances the insulation effect of the wire, reduces the heat loss of the stator coil, and improves the overall efficiency of the motor; another part of the high-pressure cooling gas passes through the secondary radial bearing seat air guide groove one 501 of the secondary radial bearing seat 5 and the secondary diffuser air guide groove one 111 of the secondary diffuser 11, enters the gas gap between the shaft 3 and the secondary side radial bearing 6, and enhances the convection heat dissipation capacity of the air at the bearing through the high-pressure gas, cools the shaft 3 and the secondary side radial bearing 6, and the two gas flows enter the primary side stator coil through the motor stator and rotor air gap. Finally, the high-pressure gas in the motor cavity is discharged through the casing exhaust groove 105.

[0113] In the present example, because the flow resistance of high-pressure gas flowing through the second-stage radial bearing seat gas guide groove 501 and the second-stage diffuser gas guide groove 112 is greater than that of the casing gas guide groove 103, in order to ensure that high-pressure gas flows through the casing gas guide groove 103 and the second-stage diffuser gas guide groove 112, respectively, the structure and size of the two gas guide grooves should satisfy that the cross-sectional area of the second-stage diffuser gas guide groove 112 is between 150% and 300% of the cross-sectional area of the casing gas guide groove 103.

[0114] Compared with the prior art, the present example forms a self-circulation ventilation cooling structure inside the motor through the design of the whole-machine ventilation flow path, without the need to introduce gas into the casing from the air compressor connection pipe, which can reduce motor parts and structural features, efficiently cool key parts such as the radial rotating system and the motor stator and rotor, improve the overall efficiency of the machine, prolong the service life of the motor, and improve the safety and reliability of the air compressor.

[0115] In some embodiments, one end of the second radial bearing assembly is in communication with the casing gas guide groove 102, and the other end can be in communication with the interior of the casing 1. The casing 1 is further provided with a casing gas guide groove 104, one end of which is in communication with the casing gas guide groove 102, and the other end is in communication with the interior of the casing 1, so that part of the gas in the casing gas guide groove 102 can also be introduced into the interior of the casing 1 through the casing gas guide groove 104.

[0116] The present application can introduce the gas cooled by the second radial bearing assembly into the interior of the casing to cool the motor stator and other parts in the interior of the casing. In order to improve the cooling effect of the motor stator, the present application forms a casing gas guide groove on the casing, which can directly introduce gas from the casing gas guide groove 102, preventing the temperature of the gas after heat exchange by the second radial bearing assembly from being too high to adversely affect the cooling of the motor.

[0117] In some embodiments, the casing 1 is further provided with a casing exhaust groove 105, one end of which is in communication with the interior of the casing 1, and the other end can guide gas out to the outside. The casing exhaust groove 105 is arranged close to the first radial bearing assembly relative to the second radial bearing assembly. The gas entering the interior of the casing 1 through the second radial bearing assembly can mix with the gas entering the interior of the casing 1 through the casing gas guide groove 104, and can cool the motor stator 2. The mixed gas can mix with the gas entering the interior of the casing 1 through the first radial bearing assembly, and can be discharged through the casing exhaust groove 105.

[0118] The application can also guide the gas in the machine shell after heat exchange to the outside of the machine shell through the machine shell exhaust groove arranged on the machine shell, without external gas, and the gas of the compression system itself can effectively cool and radiate the multiple components (including motor, axial bearing, radial bearing and other components) in the system.

[0119] In some embodiments, the first radial bearing assembly further comprises a first radial bearing seat 4, the first radial bearing 6a is supported on the outer periphery of the rotating shaft 3, the first radial bearing seat 4 is supported on the radial outer periphery of the first radial bearing 6a,

[0120] The second radial bearing assembly further comprises a second radial bearing seat 5, the second radial bearing 6b is supported on the outer periphery of the rotating shaft 3, the second radial bearing seat 5 is supported on the radial outer periphery of the second radial bearing 6b,

[0121] And the first radial bearing seat 4 is provided with a first radial bearing seat gas guide groove 401;

[0122] One end of the first radial bearing seat gas guide groove 401 is communicated with the machine shell gas guide groove 102, and the other end is communicated with the inside of the first volute 14.

[0123] The application can also guide the gas in the machine shell after heat exchange to the outside of the machine shell through the machine shell exhaust groove arranged on the machine shell, without external gas, and the gas of the compression system itself can effectively cool and radiate the multiple components (including motor, axial bearing, radial bearing and other components) in the system.

[0124] In some embodiments, the second radial bearing seat 5 is provided with a second radial bearing seat gas guide groove 501;

[0125] One end of the second radial bearing seat gas guide groove 501 is communicated with the machine shell gas guide groove 102, and the other end is communicated with the second radial bearing assembly.

[0126] The application can also guide the gas in the machine shell after heat exchange to the outside of the machine shell through the machine shell exhaust groove arranged on the machine shell, without external gas, and the gas of the compression system itself can effectively cool and radiate the multiple components (including motor, axial bearing, radial bearing and other components) in the system.

[0127] In some embodiments, the axial bearing 8 comprises an axial flat foil 81, an axial wave foil 84 and an axial bottom foil 85, the axial wave foil 84 is located between the axial flat foil 81 and the axial bottom foil 85, the axial flat foil 81 comprises an axial flat foil flat section 811, an axial flat foil inclined section 812 and an axial flat foil bearing section 813, the axial wave foil 84 comprises an axial wave foil flat section 841 and an axial wave foil support section 842, the axial wave foil support section 842 protrudes towards the axial flat foil bearing section 813 relative to the axial wave foil flat section 841, and the axial wave foil support section 842 comprises a first wave foil support section 8421 and a second wave foil support section 8422 with different protruding heights in the axial direction.

[0128] This is the preferred structure of the axial bearing of the present application, by setting the wave foil support section as a support section with different heights in the axial direction, different support stiffness can be provided, different support effects for different working conditions of the rotating shaft are provided, and the support effect for the rotating shaft is improved.

[0129] The structure of the axial bearing 8 in the axial rotation system of the present application is shown in Figures 3 to 8 The axial bearing 8 is composed of an axial flat foil 81, an axial first layer gasket 82, an axial second layer gasket 83, an axial wave foil 84 and an axial bottom foil 85. The specific structure is: an axial flat foil flat section 811, an axial flat foil inclined section 812, an axial flat foil bearing section 813, an axial flat foil adjusting structure 814; an axial first layer gasket support section 822; an axial second layer gasket support section 832; an axial wave foil flat section 841, an axial wave foil support section 842; an axial bottom foil flat section 851, an axial bottom foil clamping groove 852, an axial bottom foil adjusting structure 853; when the axial bearing is working, the environmental gas is brought into the axial flat foil bearing section from the axial flat foil inclined section due to the high-speed rotation of the motor rotor, the gas is compressed due to the reduction of the cross-sectional area of the air gap through which the gas flows, and a high-pressure lubricating gas film is formed between the axial flat foil bearing section 813 and the axial disc 7, which provides axial support for the stable operation of the motor rotor-axial rotation system.

[0130] In some embodiments, a plurality of interval grooves 846 are formed in the circumferential direction at the position of the axial wave foil support section 842 to separate the axial wave foil support section 842 into different support sections, and the interval grooves 846 are sequentially and spacedly arranged in the radial direction, so that the axial wave foil support section 842 is separated into the first wave foil support section 8421 located at the radially outermost side and the radially innermost side, and the second wave foil support section 8422 located between adjacent two interval grooves 846. The present application also adopts the E open-loop wave foil structure (the interval grooves are divided into a plurality of wave foil support sections) for the axial bearing assembly, which can effectively reduce the support stiffness of the bearing area, provide a support structure with different stiffness for the rotating shaft, provide a support performance suitable for different working conditions, and improve the support effect.

[0131] In some embodiments, the spacing grooves 846 are 3, separating the axial wave foil support section 842 into two first wave foil support sections 8421 located at the radially outermost and radially innermost, and 3 second wave foil support sections 8422 located between adjacent two spacing grooves 846; and / or the protruding height of the second wave foil support section 8422 is higher than that of the first wave foil support section 8421. This is a further preferred structure of the first and second wave foil support sections of the present application, and the height of the second wave foil support section is preferably smaller than the stiffness of the first wave foil support section.

[0132] During assembly, the axial flat foil adjusting structure is in contact with the axial bottom sheet adjusting structure through the axial first layer of gaskets, the axial second layer of gaskets, and the clamping groove of the axial wave foil, and the axial flat foil, the axial wave foil, and the axial bottom sheet pin hole positions are adjusted to be aligned one by one, at which time the axial bearing foil pieces are axially locked. The sum of the heights of the axial flat foil adjusting structure and the axial bottom sheet adjusting structure should be slightly smaller than the sum of the thicknesses of the axial flat foil, the axial first layer of gaskets, the axial second layer of gaskets, the axial wave foil, and the axial bottom sheet, so that the parts of the axial bearing can be closely fitted. Adjusting the thickness of the gasket can adjust the height gradient change of the flat foil inclined section, slow down the gas film pressure gradient change, and improve the bearing carrying performance. In addition, when the bearing is in a pre-tightened state, the pre-deformation of the axial flat foil and the axial wave foil can improve the bearing carrying capacity and improve the dynamic stability of the bearing, reduce the wear of the bearing during work, and improve the service life of the bearing.

[0133] When the axial wave foil of the axial bearing adopts the basic wave support structure, there are problems such as uneven support stiffness distribution. The present application designs an E open-loop wave structure to adjust the stiffness change of the axial wave foil support and coordinate the overall deformation of the bearing. The specific analysis is as follows: The starting end of the E-type groove is at the flat section of the wave foil, the first arch unit structure is complete, and the average stiffness of the wave foil structure remains consistent. The bearing segments are divided into four parts along the radial direction, which are the first wave foil support section 8421 at the radially outermost and the radially innermost, and the second wave foil support section 8422 in the middle of the radial direction. The wave foil width of the first wave foil support section 8421 should be smaller than that of the second wave foil support section 8422. The included angle between the end of the E-type structure and the starting end of the flat section of the wave foil is between 0.3 and 0.7 times the included angle of the bearing segment, and the ratio can be regarded as the pitch ratio of the axial bearing. The value can be adjusted according to the number of support arches and the number of bearing segments to improve the bearing carrying performance. The stiffness of the wave foil at both ends is relatively large, and the gas film pressure is relatively small, so the deformation of the wave foil support section at both ends is relatively small, and the deformation of the wave foil support section in the middle is relatively large, which is beneficial to the accumulation of gas in the middle of the bearing, reduces the leakage of high-pressure gas along the radial direction from both sides of the wave foil, and effectively improves the carrying capacity of the bearing; the E-type groove penetrates along the middle circumferential direction, reduces the stiffness of the middle section of the segment, reduces the gas leakage at the end, increases the gas film thickness in the high-pressure area, and further improves the bearing carrying capacity.

[0134] In the present example, the wave foil of the axial bearing 8 adopts an ultra-thin alloy foil sheet, and the optimal thickness is 0.05-0.15 mm. When the rigidity meets the requirements, the arch unit parameters and the wave foil thickness can be adjusted to improve the elasticity of the wave foil and increase the service life of the bearing. Generally, the optimal thickness of the top foil is 0.1-0.3 mm. The thick flat foil can improve the rigidity of the bearing, reduce the deformation of the surface structure of the flat foil, the gas film thickness is uniformly distributed, and the stability of the bearing is improved.

[0135] In some embodiments, the axial bearing assembly further comprises an axial disc 7, an axial end of the radial inner side of the axial disc 7 is connected to the thrust surface of the rotating shaft 3, an axial end of the radial outer side of the axial disc 7 is provided with one of the axial bearings 8, which is the front axial bearing, and the other axial end of the radial outer side of the axial disc 7 is provided with another axial bearing 8, which is the rear axial bearing.

[0136] The axial bearing assembly further comprises an axial gap adjusting ring 9, which is arranged on the radial outer side of the axial disc 7 and located between the front axial bearing and the rear axial bearing. The gap δ between the axial disc 7 and the axial bearing 8 can be adjusted through the axial gap adjusting ring 9.

[0137] The present application can also reduce the gas film height at the entrance of the inclined surface by designing an adjusting structure on the flat foil, improve the load carrying capacity of the axial bearing; and install an axial gap adjusting ring between the axial bearing assemblies, and the axial gap adjusting ring is provided with a gas passage, so as to realize accurate adjustment of the axial gap and effective cooling of the axial bearing.

[0138] The axial rotating system of the present application is shown in Figure 2 The axial rotating system of the present application is shown in

[0139] In some embodiments, the axial thickness of the axial gap adjusting ring 9 is H, the total axial height of the axial bearing 8 is T, the sum of the axial thickness of each foil is t, the axial thickness of the axial disc 7 is h, and the adjustable gap between the rotating shaft 3 and the axial bearing 8 is 2δ=H+2t-h-2T.

[0140] In the present example, the axial gap adjusting structure is shown in Figures 9 to 11As shown, it consists of an axial adjustment ring gap section 911, an axial adjustment ring support section 912, and an axial adjustment ring positioning hole 913. The axial gap adjustment ring 911 is installed between the axial disk 7 and the axial bearing 8. Multiple circumferential axial adjustment ring positioning holes 913 are arranged on the surface of the axial adjustment ring support section 912, corresponding one-to-one with the pin holes of each foil of the axial bearing. The axial adjustment ring support section 912 is tightly fitted with the axial flat foil section 811, and the axial adjustment ring gap section 911 is lower than the axial adjustment ring support section 912. High-temperature, high-pressure gas in the axial rotation system can be drawn out through the end cover and the axial gap adjustment ring to reduce the temperature of the axial rotation system. The thickness of the axial gap adjustment ring is H, the total height of the axial bearing is T, the sum of the thicknesses of each foil is t, and the thickness of the axial disk is h. Therefore, the gap between the motor rotor and the axial bearing is 2δ = H + 2t - h - 2T. Changing the thickness H of the axial gap adjustment ring adjusts the gas gap between the axial bearing and the axial disk, thus achieving axial gas gap adjustment.

[0141] In some embodiments, the primary radial bearing 6a and the secondary radial bearing 6b have the same structure, both being radial bearings 6. The radial bearing 6 includes a radial base plate 61, a radial first layer of corrugated foil 62, a radial second layer of corrugated foil 63, a radial first layer of flat foil 64, a radial second layer of flat foil 65, and a radial third layer of flat foil 66. Along the radially inward direction, the radial base plate 61, the radial first layer of corrugated foil 62, the radial second layer of corrugated foil 63, the radial first layer of flat foil 64, the radial second layer of flat foil 65, and the radial third layer of flat foil 66 are arranged sequentially.

[0142] This is the preferred structural form of the radial bearing of the present invention. By adopting a combination structure of multi-layer flat foil and multi-layer corrugated foil, the load-bearing performance of the radial bearing and the adaptability and operational stability of the radial rotation system can be improved.

[0143] The radial rotation system of the present invention is as follows Figure 12 As shown, the assembly includes a primary radial bearing housing 4, a rotating shaft 3 that rotates relative to the primary radial bearing housing 4, and a radial bearing assembly that supports the rotating shaft 3 relative to the primary radial bearing housing 4 via a radial bearing 6. The radial bearing assembly includes a radial bearing 6, a radial washer 20, and a radial retaining ring 21, and is mounted within the primary radial bearing housing 4. The radial bearing 6 provides elastic support, and the radial washer 20 and the radial retaining ring 21 axially lock the radial bearing 6.

[0144] The foil gas hydrodynamic bearing (radial bearing 6) in the radial rotation system of the present invention preferably has the following structure: Figures 13 to 17As shown, the radial bearing is composed of a radial bottom sheet 61, a radial first layer of wave foil 62, a radial second layer of wave foil 63, a radial first layer of flat foil 64, a radial second layer of flat foil 65, a radial third layer of flat foil 66 and a radial U-shaped groove 67. When the motor rotor rotates at high speed, the gas flows from the place with the largest gas film thickness to the place with the smallest gas film thickness under the action of viscous force, forming a wedge effect. The gas is compressed due to the reduction of the cross-sectional area, the gas film pressure between the radial bearing and the motor rotor is increased, providing radial bearing for the rotor-rotation system, and the motor rotor thus works in suspension between the motor rotor and the bearing.

[0145] The preferred structure of the foil gas dynamic pressure bearing is assembled as follows: the fixed end 671 of the radial U-shaped groove is installed in the pre-set clamping groove of the radial bearing seat, the radial bearing is composed of the radial bottom sheet 61, the radial first layer of wave foil 62, the radial second layer of wave foil 63, the radial first layer of flat foil 64, the radial second layer of flat foil 65 and the radial third layer of flat foil 66 in turn, the fixed ends of the formed radial bottom sheet 61, the radial first layer of wave foil 62, the radial second layer of wave foil 63, the radial first layer of flat foil 64, the radial second layer of flat foil 65 and the radial third layer of flat foil 66 are installed between the free end 672 of the radial U-shaped groove and the clamping groove of the radial bearing seat, and the free ends of the radial bottom sheet 61, the radial first layer of wave foil 62, the radial second layer of wave foil 63, the radial first layer of flat foil 64, the radial second layer of flat foil 65 and the radial third layer of flat foil 66 are installed between the radial U-shaped groove 67 and the radial bearing seat. The radial gasket 20 and the radial retainer 21 are installed in the direction of both sides of the axial direction of the radial bearing respectively, and the radial bearing is fixed in the axial direction.

[0146] In some embodiments, the radial first layer of wave foil 62 has a smaller arch height than the radial second layer of wave foil 63, and a radial wave foil gap 601 is formed between the radial first layer of wave foil 62 and the radial second layer of wave foil 63;

[0147] The radial second layer of flat foil 65 is a non-integer structure, and a radial flat foil gap 602 is formed between the radial first layer of flat foil 64 and the radial third layer of flat foil 66 in the position without the radial second layer of flat foil 65;

[0148] When the shaft 3 is running, a rotor bearing gap 603 is formed between the radial third layer of flat foil 66 and the shaft 3.

[0149] The foil gas dynamic pressure bearing preferably has a double-layer wave foil and a multi-layer flat foil structure, wherein a radial wave foil gap 601, a radial flat foil gap 602, and a rotor bearing gap 603 are formed. When the wave foil is installed in the radial bearing seat, the flat sections of the radial first layer wave foil and the radial second layer wave foil are attached to each other, the first layer wave foil has a designed arch height h1 of 60%-80% of the arch height h2 of the second layer wave foil, and thus the radial wave foil gap 601 is formed in each section of the arch. The second layer flat foil is a non-entire-circle structure, and when the radial bearing is in the structure part without the second layer flat foil, the radial flat foil gap 602 is formed between the first layer flat foil and the third layer flat foil. When the rotating shaft is in operation, the rotor bearing gap 603 is formed between the radial bearing and the rotating shaft 3, and the radial rotating system is provided with radial support.

[0150] In some embodiments, the arch height h1 of the radial first layer wave foil 62 is 60%-80% of the arch height h2 of the radial second layer wave foil 63.

[0151] When the motor rotor rotates at a high speed, the radial second layer wave foil provides support for the radial bearing. When the gas film stiffness between the motor rotor and the radial bearing is greater than the stiffness of the radial second layer wave foil, the radial second layer wave foil is elastically deformed and gradually contacts the supporting arch of the radial first layer wave foil. When the gas film stiffness between the motor rotor and the radial bearing is greater than the sum of the stiffness of the second layer wave foil and the stiffness of the first layer wave foil, the two layers of wave foils of the radial bearing are elastically deformed. The implementation of the design scheme of the two layers of wave foils can increase the bearing damping and the support stiffness of the arch foil, improve the load-carrying performance of the arch foil, and greatly improve the load-carrying performance of the gas dynamic pressure bearing and the stability of the bearing system.

[0152] In some embodiments, the radial first layer wave foil 62 and the radial second layer wave foil 63 are both arranged in a multi-section structure in the axial direction, and at least one of the arch height, the pitch, and the chord length of each section is different. This is a further preferred structure of the radial wave foil of the present application. By forming a multi-section structure with different structures in the axial direction, different support stiffnesses can be provided, so as to be suitable for supporting effects in more working conditions, improve the general support performance, and enhance the support effect.

[0153] As Figures 16-17In some embodiments, the radial first layer wave foil 62 comprises a radial first layer wave foil first segment 622, a radial first layer wave foil second segment 623, a radial first layer wave foil third segment 624, and a radial first layer wave foil fourth segment 625, the radial first layer wave foil first segment 622, the radial first layer wave foil third segment 624, and the radial first layer wave foil fourth segment 625 are sequentially connected in the circumferential direction, and the radial first layer wave foil second segment 623 is at least two, one of which is located on one axial side of the radial first layer wave foil third segment 624 and is spaced apart therefrom, and the other is located on the other axial side of the radial first layer wave foil third segment 624 and is spaced apart therefrom.

[0154] The preferred structure of the radial bearing wave foil of the present example is shown in the prior art Figure 16 and 17 The radial wave foil is designed as a multi-segment structure in the circumferential direction, and is divided into two segments, three segments, and two segments in the axial direction, which are respectively a radial first layer wave foil first segment 622, a radial first layer wave foil second segment 623, a radial first layer wave foil third segment 624, and a radial first layer wave foil fourth segment 625. Among them, the design parameters of each wave foil structure such as arch height, pitch, chord length, etc. are designed with different wave foil structure parameters according to different support positions. The radial first layer wave foil first segment 622 is a support unit at the inlet of the lubricating gas film, and the support stiffness is smaller than that of the radial first layer wave foil second segment 623 and the radial first layer wave foil third segment 624, which is beneficial to increase the gas film thickness at the inlet and enhance the wedge effect; under the action of large load, the support stiffness of the radial first layer wave foil second segment 623 should be smaller than that of the radial first layer wave foil third segment 624, so as to ensure that the radial first layer wave foil second segment 623 can have greater deformation, so that the eccentricity of the radial bearing is larger, and the bearing carrying capacity is improved. Under the action of light load, the support stiffness of the radial first layer wave foil second segment 623 should be greater than that of the radial first layer wave foil third segment 624, so that the gas film thickness at the radial first layer wave foil second segment 623 is greater than that at the radial first layer wave foil third segment 624, the gas end leakage effect is reduced, and the bearing carrying capacity is improved. The support stiffness of the radial first layer wave foil fourth segment 625 is relatively greater than that of the radial first layer wave foil first segment 622, the radial first layer wave foil second segment 623, and the radial first layer wave foil third segment 624, so as to reduce the gas film thickness at the free end of the wave foil, increase the high-pressure area of the radial bearing, and improve the carrying capacity of the bearing. The wave foil adopts axial segmentation and circumferential segmentation structure, which can adjust the stiffness distribution of the radial bearing, uniform the gas film pressure distribution, and greatly improve the carrying capacity and running stability of the radial bearing.

[0155] In some embodiments, the first radial layer wave foil first segment 622 is arranged in at least two along the axial direction, one of which has a circumferential one end portion connected to the one of the second radial layer wave foil segment 623 and a circumferential another end portion connected to the third radial layer wave foil segment 624, and the other of the first radial layer wave foil first segment 622 has a circumferential one end portion connected to the other of the second radial layer wave foil segment 623 and a circumferential another end portion connected to the third radial layer wave foil segment 624.

[0156] The fourth radial layer wave foil segment 625 is arranged in at least two along the axial direction, one of which has a circumferential one end portion connected to the one of the second radial layer wave foil segment 623 and a circumferential another end portion connected to the third radial layer wave foil segment 624, and the other of the fourth radial layer wave foil segment 625 has a circumferential one end portion connected to the other of the second radial layer wave foil segment 623 and a circumferential another end portion connected to the third radial layer wave foil segment 624.

[0157] As Figures 18-19 , the radial wave foil alternative embodiment, in some embodiments, the first radial layer wave foil 62 includes a first radial layer wave foil first segment 622, a first radial layer wave foil second segment 623, a first radial layer wave foil third segment 624 and a first radial layer wave foil fourth segment 625, the first radial layer wave foil first segment 622, the first radial layer wave foil third segment 624 and the first radial layer wave foil fourth segment 625 are arranged in sequence along the axial direction, the arch height of the first radial layer wave foil first segment 622 is arranged in axial staggered with the arch height of the first radial layer wave foil second segment 623, and the arch height of the first radial layer wave foil third segment 624 and the first radial layer wave foil fourth segment 625 are arranged in axial staggered.

[0158] The radial bearing wave foil alternative structure of the present example is as prior art Figures 18 to 19As shown, the structure comprises a fixed end 621 of the first radial layer of corrugated foil, a first segment 622 of the first radial layer of corrugated foil, a second segment 623 of the first radial layer of corrugated foil, and a third segment 624 of the first radial layer of corrugated foil. In the corrugated foil structure of this invention, the stiffness of the second radial layer of corrugated foil 63 is less than that of the first radial layer of corrugated foil 62. Under low load, the second radial layer of corrugated foil 63 initially provides the load-bearing capacity. As the load increases, the second radial layer of corrugated foil 63 deforms to a certain extent and then comes into contact with the first radial layer of corrugated foil 62. The first radial layer of corrugated foil 62 and the second radial layer of corrugated foil 63 jointly provide the load-bearing capacity. The design parameters of the first radial layer of corrugated foil 62 and the second radial layer of corrugated foil 63 are different, requiring the flat segments of the first radial layer of corrugated foil 62 and the second radial layer of corrugated foil 63 to fit together, but interference is not allowed. Furthermore, the arch height of the second radial layer of corrugated foil 63 is greater than that of the first radial layer of corrugated foil 62, and there are gaps in each arch segment. The first radial corrugated foil 62 and the second radial corrugated foil 63 are designed as a four-segment structure. The first segment 622 and the fourth segment 625 of the first radial corrugated foil are connected together, and the two middle segments, the second segment 623 and the third segment 624, are connected together, forming a supporting arch foil similar to a "U"-shaped structure. The crests of the first segment 622 and the fourth segment 625 are staggered from those of the second segment 623 and the third segment 624, forming a variable stiffness arch foil. One end of the second segment 623 and the third segment 624 is free, and both ends are fixedly connected to the free ends of the first segment 622 and the fourth segment 625. The design parameters for the arch height, chord length, and flat section of the first section 622, the second section 623, the third section 624, and the fourth section 625 of the first radial corrugated foil are all the same. This variable stiffness corrugated foil implementation scheme can effectively improve the end leakage phenomenon of radial bearings and enhance the load-bearing performance of gas dynamic radial bearings. The stiffness of the outer supporting corrugated foils on both sides and the two middle corrugated foils of the four-section corrugated foil of the gas dynamic radial bearing can be designed with a stiffness difference between the middle and the two ends according to the motor operating requirements, thereby improving the bearing's impact resistance and enhancing the load-bearing stability of the bearing system.

[0159] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An air-float motor system, characterized in that: include: The machine housing (1), shaft (3), motor assembly, primary compression assembly, secondary compression assembly, first radial bearing assembly, second radial bearing assembly, axial bearing assembly, and gas conduction channel are provided. The primary compression assembly and the secondary compression assembly are connected to the shaft (3) so that they can be driven by the shaft (3) respectively. The first radial bearing assembly and the second radial bearing can be supported on different shaft sections of the shaft (3) respectively. The axial bearing assembly provides axial support and thrust to the shaft (3). The machine housing (1) is provided with a cooling channel (101). The gas conduction channel can introduce gas from the primary compression assembly and / or the secondary compression assembly, and after heat exchange with the cooling medium in the cooling channel (101), it can dissipate heat and cool at least one of the motor assembly, the primary compression assembly, the secondary compression assembly, the first radial bearing assembly, the second radial bearing assembly, and the axial bearing assembly. The first radial bearing assembly is disposed at a position connected to the axial bearing assembly, and the second radial bearing assembly is disposed at a position connected to the secondary compression assembly; The cooling channel (101) is an annular, arc-shaped, or spiral structure opened on the housing (1). The gas conduction channel includes a housing air duct two (103) provided on the housing (1). One end of the housing air duct two (103) is connected to the interior of the axial bearing assembly to introduce gas. The introduced gas can exchange heat with the cooling medium in the cooling channel (101) in the housing air duct two (103). The other end of the housing air duct two (103) can guide the gas to the second radial bearing assembly to cool the second radial bearing assembly. The interior of the axial bearing assembly is also connected to the first radial bearing assembly to introduce gas to cool and dissipate heat from the first radial bearing assembly.

2. The air-float motor system according to claim 1, characterized in that: The first radial bearing assembly includes a primary radial bearing (6a), the second radial bearing assembly includes a secondary radial bearing (6b), the primary radial bearing (6a) and the secondary radial bearing (6b) are respectively supported on different shaft segments of the rotating shaft (3), and the axial bearing assembly includes an axial bearing (8), which can provide axial support or thrust to the rotating shaft (3). The motor assembly includes a motor stator (2), which can drive the rotating shaft (3) to rotate; the primary compression assembly is located at one axial end of the rotating shaft (3), and the secondary compression assembly is located at the other axial end of the rotating shaft (3); the gas compressed by the primary compression assembly enters the secondary compression assembly for secondary compression.

3. The air-float motor system according to claim 2, characterized in that: The first-stage compression assembly includes a first-stage impeller (12), a first-stage diffuser (10), and a first-stage volute (14). The first-stage impeller (12) is fixedly connected to one axial end of the rotating shaft (3) so that the first-stage impeller (12) can rotate in the first-stage volute (14) through the rotation of the rotating shaft (3), thereby compressing the gas. The second-stage compression assembly includes a second-stage impeller (13), a second-stage diffuser (11), and a second-stage volute (15). The second-stage impeller (13) is fixedly connected to one axial end of the rotating shaft (3) so that the second-stage impeller (13) can rotate in the second-stage volute (15) through the rotation of the rotating shaft (3), thereby compressing the gas. The outlet end of the first-stage volute (14) is connected to the inlet end of the second-stage volute (15).

4. The air-float motor system according to claim 3, characterized in that: The axial bearing assembly is located at the position connected to the primary compression assembly; the gas conduction channel includes a housing air venting groove (102) disposed on the housing (1), one end of the housing air venting groove (102) is connected to the interior of the secondary volute (15) to introduce gas, the introduced gas in the housing air venting groove (102) can exchange heat with the cooling medium in the cooling channel (101), and the other end of the housing air venting groove (102) can guide the gas to the axial bearing assembly to cool the axial bearing assembly.

5. The air-float motor system according to claim 4, characterized in that: One end of the interior of the second radial bearing assembly is connected to the second air duct (103) of the housing and the other end is connected to the interior of the housing (1). The housing (1) is also provided with a housing air guide groove (104). One end of the housing air guide groove (104) is connected to the second air duct (103) of the housing and the other end is connected to the interior of the housing (1), so that some of the gas in the second air duct (103) of the housing can be introduced into the interior of the housing (1) through the housing air guide groove (104).

6. The air-float motor system according to claim 5, characterized in that: The housing (1) is also provided with a housing exhaust groove (105). One end of the housing exhaust groove (105) is connected to the interior of the housing (1), and the other end can lead the gas to the secondary compression assembly. The housing exhaust groove (105) is set close to the first radial bearing assembly relative to the second radial bearing assembly. The gas entering the housing (1) through the second radial bearing assembly and the gas entering the housing (1) through the housing air guide groove (104) can be mixed inside the housing (1) and can cool the motor stator (2). The mixed gas can be mixed with the gas entering the housing (1) through the first radial bearing assembly and discharged through the housing exhaust groove (105).

7. The air-float motor system according to claim 6, characterized in that: The first radial bearing assembly further includes a primary radial bearing seat (4), the primary radial bearing (6a) is supported on the outer periphery of the rotating shaft (3), the primary radial bearing seat (4) is supported on the radial outer periphery of the primary radial bearing (6a), and the primary radial bearing seat (4) is provided with a primary radial bearing seat air guide groove one (401), a primary radial bearing seat air guide groove two (402) and a primary radial bearing seat exhaust groove (403). The first-stage volute (14) is also provided with a first-stage volute exhaust groove (141). The housing exhaust groove (105), the first-stage radial bearing seat exhaust groove (403) and the first-stage volute exhaust groove (141) are connected. The air flotation motor system also includes a connecting pipe (16). One end of the connecting pipe (16) is connected to the first-stage volute exhaust groove (141) and the other end is connected to the second-stage compression assembly. One end of the first-stage radial bearing seat air guide groove (401) is connected to the first housing air guide groove (102), and the other end is connected to the axial bearing assembly. One end of the second-stage radial bearing seat air guide groove (402) is connected to the second housing air guide groove (103), and the other end is connected to the axial bearing assembly.

8. The air-float motor system according to claim 5, characterized in that: The second radial bearing assembly also includes a secondary radial bearing housing (5), the secondary radial bearing (6b) is supported on the outer periphery of the rotating shaft (3), the secondary radial bearing housing (5) is supported on the radial outer periphery of the secondary radial bearing (6b), and the secondary radial bearing housing (5) is provided with a first secondary radial bearing housing air guide groove (501) and a second secondary radial bearing housing air guide groove (502). One end of the first air guide groove of the secondary radial bearing seat (501) is connected to the interior of the secondary volute (15), and the other end is connected to the first air guide groove of the housing (102). One end of the second air guide groove of the secondary radial bearing seat (502) is connected to the second air guide groove of the housing (103), and the other end is connected to the second radial bearing assembly.

9. The air-float motor system according to claim 3, characterized in that: The axial bearing assembly is positioned in contact with the primary compression assembly; the gas conduction channel includes a housing air vent (102) disposed on the housing (1), one end of the housing air vent (102) being connected to the interior of the primary volute (14) to introduce gas, the introduced gas being able to exchange heat with the cooling medium in the cooling channel (101) in the housing air vent (102), and the other end of the housing air vent (102) being able to guide gas into the second radial bearing assembly to cool the second radial bearing assembly; the interior of the axial bearing assembly is also connected to the interior of the primary volute (14) to introduce gas to cool and dissipate heat from the axial bearing assembly; the interior of the axial bearing assembly is also connected to the first radial bearing assembly to introduce gas to cool and dissipate heat from the first radial bearing assembly.

10. The air-float motor system according to claim 9, characterized in that: One end of the second radial bearing assembly is connected to the housing air vent (102), and the other end is connected to the interior of the housing (1). The housing (1) is also provided with a housing air guide groove (104). One end of the housing air guide groove (104) is connected to the housing air vent (102), and the other end is connected to the interior of the housing (1), so that some of the gas in the housing air vent (102) can be introduced into the interior of the housing (1) through the housing air guide groove (104).

11. The air-float motor system according to claim 10, characterized in that: The housing (1) is also provided with a housing exhaust groove (105). One end of the housing exhaust groove (105) is connected to the interior of the housing (1), and the other end can exhaust gas to the outside. The housing exhaust groove (105) is set close to the first radial bearing assembly relative to the second radial bearing assembly. The gas entering the housing (1) through the second radial bearing assembly and the gas entering the housing (1) through the housing air guide groove (104) can be mixed inside the housing (1) and can cool the motor stator (2). The mixed gas can be mixed with the gas entering the housing (1) through the first radial bearing assembly and discharged through the housing exhaust groove (105).

12. The air-float motor system according to claim 11, characterized in that: The first radial bearing assembly further includes a primary radial bearing housing (4), wherein the primary radial bearing (6a) is supported on the outer periphery of the rotating shaft (3), and the primary radial bearing housing (4) is supported on the radial outer periphery of the primary radial bearing (6a). The second radial bearing assembly further includes a secondary radial bearing housing (5), the secondary radial bearing (6b) being supported on the outer periphery of the shaft (3), and the secondary radial bearing housing (5) being supported on the radial outer periphery of the secondary radial bearing (6b). Furthermore, a first-stage radial bearing seat air guide groove (401) is provided on the first-stage radial bearing seat (4). One end of the first-stage radial bearing seat air guide groove (401) is connected to the first-stage housing air guide groove (102), and the other end is connected to the interior of the first-stage volute (14).

13. The air-float motor system according to claim 12, characterized in that: The secondary radial bearing seat (5) is provided with a secondary radial bearing seat air guide groove (501). One end of the secondary radial bearing seat air guide groove (501) is connected to the housing air guide groove (102), and the other end is connected to the second radial bearing assembly.

14. The air-float motor system according to claim 2, characterized in that: The axial bearing (8) includes an axial flat foil (81), an axial corrugated foil (84), and an axial base plate (85). The axial corrugated foil (84) is located between the axial flat foil (81) and the axial base plate (85). The axial flat foil (81) includes an axial flat foil flat section (811), an axial flat foil inclined section (812), and an axial flat foil bearing section (813). The axial corrugated foil (84) includes an axial corrugated foil flat section (841) and an axial corrugated foil support section (842). The axial corrugated foil support section (842) protrudes toward the axial flat foil bearing section (813) relative to the axial corrugated foil flat section (841), and the axial corrugated foil support section (842) includes a first corrugated foil support section (8421) and a second corrugated foil support section (8422) with different protrusion heights along the axial direction.

15. The air-float motor system according to claim 14, characterized in that: A circumferentially spaced groove (846) is provided at the position of the axial corrugated foil support section (842) to divide the axial corrugated foil support section (842) into different support sections. There are multiple grooves (846), and the multiple grooves (846) are arranged in a radially spaced manner to divide the axial corrugated foil support section (842) into the first corrugated foil support section (8421) located on the outermost radial side and the second corrugated foil support section (8422) located between two adjacent grooves (846).

16. The air-float motor system according to claim 15, characterized in that: There are three spacer slots (846), which divide the axial corrugated foil support section (842) into two first corrugated foil support sections (8421) located on the outermost radial side and on the innermost radial side, and three second corrugated foil support sections (8422) located between two adjacent spacer slots (846); and / or the protrusion height of the second corrugated foil support section (8422) is higher than the protrusion height of the first corrugated foil support section (8421).

17. The air-float motor system according to claim 14, characterized in that: The axial bearing assembly also includes an axial disk (7), one axial end of the radially inner side of the axial disk (7) is connected to the thrust surface of the rotating shaft (3), one axial bearing (8) is provided at one axial end of the radially outer side of the axial disk (7), which is the front axial bearing, and another axial bearing (8) is provided at the other axial end of the radially outer side of the axial disk (7), which is the rear axial bearing. The axial bearing assembly also includes an axial clearance adjustment ring (9), which is located on the radial outer side of the axial disk (7) and between the front axial bearing and the rear axial bearing. The axial clearance adjustment ring (9) can adjust the clearance δ between the axial disk (7) and the axial bearing (8).

18. The air-float motor system according to claim 17, characterized in that: The axial thickness of the axial clearance adjusting ring (9) is H, the total axial height of the axial bearing (8) is T, the sum of the axial thicknesses of each foil is t, the axial thickness of the axial disk (7) is h, and the adjustable gap between the rotating shaft (3) and the axial bearing (8) is 2δ=H+2t-h-2T.

19. The air-float motor system according to any one of claims 2-18, characterized in that: The first-stage radial bearing (6a) and the second-stage radial bearing (6b) have the same structure, both being radial bearings (6). The radial bearing (6) includes a radial base plate (61), a first radial corrugated foil (62), a second radial corrugated foil (63), a first radial flat foil (64), a second radial flat foil (65), and a third radial flat foil (66). Along the radially inward direction, the radial base plate (61), the first radial corrugated foil (62), the second radial corrugated foil (63), the first radial flat foil (64), the second radial flat foil (65), and the third radial flat foil (66) are arranged sequentially.

20. The air-float motor system according to claim 19, characterized in that: The arch height of the first radial corrugated foil (62) is smaller than the arch height of the second radial corrugated foil (63), forming a radial corrugated foil gap (601) between the first radial corrugated foil (62) and the second radial corrugated foil (63). The radial second layer flat foil (65) has a non-circular structure. In the position where the radial second layer flat foil (65) is not present, a radial flat foil gap (602) is formed between the radial first layer flat foil (64) and the radial third layer flat foil (66). When the shaft (3) is running, a rotor bearing gap (603) is formed between the radial third layer flat foil (66) and the shaft (3).

21. The air-float motor system according to claim 19, characterized in that: The arch height h1 of the first radial layer of corrugated foil (62) is 60%-80% of the arch height h2 of the second radial layer of corrugated foil (63).

22. The air-float motor system according to claim 19, characterized in that: Both the first radial corrugated foil (62) and the second radial corrugated foil (63) are configured as multi-segment structures along the axial direction, and at least one of the arch height, pitch, and chord length of each segment is different.

23. The air-float motor system according to claim 22, characterized in that: The first radial wave foil (62) includes a first radial wave foil segment (622), a second radial wave foil segment (623), a third radial wave foil segment (624), and a fourth radial wave foil segment (625). The first radial wave foil segment (622), the third radial wave foil segment (624), and the fourth radial wave foil segment (625) are connected sequentially in the circumferential direction. There are at least two second radial wave foil segments (623). One second radial wave foil segment (623) is located on one side of the axial direction of the third radial wave foil segment (624) and is spaced apart from it. The other second radial wave foil segment (623) is located on the other side of the axial direction of the third radial wave foil segment (624) and is spaced apart from it.

24. The air-float motor system according to claim 23, characterized in that: The first segment (622) of the radial first layer of corrugated foil is configured in at least two along the axial direction, one of which is connected to the second segment (623) of the radial first layer of corrugated foil at one circumferential end and to the third segment (624) of the radial first layer of corrugated foil at one circumferential end, and the other of the first segment (622) of the radial first layer of corrugated foil is connected to the second segment (623) of the radial first layer of corrugated foil at one circumferential end and to the third segment (624) of the radial first layer of corrugated foil at one circumferential end; The fourth segment (625) of the radial first layer of corrugated foil is configured in at least two along the axial direction. One of them is connected to one of the second segments (623) of the radial first layer of corrugated foil and to the third segment (624) of the radial first layer of corrugated foil. The other fourth segment (625) of the radial first layer of corrugated foil is connected to the other second segment (623) of the radial first layer of corrugated foil and to the third segment (624) of the radial first layer of corrugated foil.

25. The air-float motor system according to claim 22, characterized in that: The first radial wave foil (62) includes a first radial wave foil segment (622), a second radial wave foil segment (623), a third radial wave foil segment (624), and a fourth radial wave foil segment (625). The first radial wave foil segment (622), the third radial wave foil segment (624), and the fourth radial wave foil segment (625) are arranged alternately along the axial direction. The arch height of the first radial wave foil segment (622) is offset from the arch height of the second radial wave foil segment (623) along the axial direction. The arch heights of the third radial wave foil segment (624) and the fourth radial wave foil segment (625) are also offset from the arch heights along the axial direction.

Images