An air-suspended motor and compressor

Abstract

The application provides an air-suspension motor and compressor, which comprises a rotor, a first radial bearing seat, a thrust disc, a first diffuser, a first radial bearing, a first axial bearing and a second axial bearing. The first diffuser is located at the outer periphery of a part of the shaft section of the rotor. The thrust disc is located between the first diffuser and the first radial bearing seat. The first axial bearing is arranged between the first diffuser and the thrust disc. The second axial bearing is arranged between the thrust disc and the first radial bearing seat, so that the rotor can be thrust. The first diffuser has a flow channel inside, which can introduce cooling gas to the axial side end surface of the first axial bearing connected with the first diffuser, and cool and provide gas for supporting the first axial bearing. According to the application, the high-pressure cooling gas can enter the inside of the axial bearing from the low-pressure area at the back of the axial bearing, so that the operation stability and carrying capacity of the air-suspension bearing are improved, and the demagnetization risk of the permanent magnet is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a gas suspension electric machine and compressor. BACKGROUND

[0002] High-speed electric machines have a wide application prospect in the fields of high-speed machine tools, high-speed centrifugal compressors, fuel cells and air blowers, etc. due to their technical characteristics of high power density, high efficiency, small size and reliable transmission. For example, in the field of fuel cells, high-speed electric machines can ensure the high compression ratio performance of air compressors, thereby reducing the size and cost of fuel cell stacks. Although high-speed electric machines have very broad application prospects due to their unique advantages in many fields, the high-speed of electric machines also brings new technical problems and challenges to the development of electric machines.

[0003] On the one hand, high speed will lead to an increase in mechanical and electrical losses of the electric machine, and an increase in heat generation. Specifically, the high-frequency electromagnetic field increases the copper loss, iron loss and eddy current loss of the high-speed electric machine, and the wind friction loss generated by the high-speed rotation of the rotor is large, resulting in a high temperature rise of the electric machine during operation. Higher operating temperature will also lead to the risk of thermal instability of the rotating system and irreversible demagnetization of the permanent magnet of the high-speed electric machine. On the other hand, the speed of the high-speed electric machine is often tens of thousands of revolutions or even hundreds of thousands of revolutions per minute, which exceeds the speed limit of conventional bearings. The carrying capacity of the foil gas bearing is proportional to the rotor speed, the higher the speed, the greater the gas film pressure, and the stronger the carrying capacity. In theory, there is no limit to the rotor speed, and the foil gas bearing has a wide application prospect at high speed. However, the high precision of the manufacturing and assembly of the foil gas bearing and the small gap between the bearing and the shaft neck / thrust disc make the structure of the high-speed electric machine more compact, but also make it more difficult to dissipate heat. In actual application, the foil bearing is prone to irreversible damage due to insufficient heat dissipation design. Based on the above reasons, the design of the internal cooling system of the high-speed electric machine has become a technical problem that needs to be solved in the industry.

[0004] Since the high-speed electric machine in the prior art forms a high-pressure gas film between the thrust disc and the axial foil gas bearing and between the shaft neck and the radial foil gas bearing during high-speed operation, it can provide sufficient axial and radial carrying capacity for the high-speed rotor. However, at the same time, the existence of the high-pressure gas film makes it difficult for cooling gas to enter the inside of the bearing, and the bearing foil cannot be effectively cooled, and the bearing foil is prone to uncontrollable thermal deformation under high temperature working conditions, thereby causing technical problems such as instability of the system during operation and damage to the gas suspension foil bearing. Therefore, the present application designs a gas suspension electric machine and compressor. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to overcome the defect that the high-speed motor in the prior art is difficult for the cooling gas to enter the bearing interior due to the existence of the high-pressure gas film when the high-speed motor is running at high speed, resulting in the instability of the system and even the damage of the gas-suspended foil bearing, so as to provide a gas-suspended motor and a compressor.

[0006] In order to solve the above problems, the present application provides a gas-suspended motor, which comprises:

[0007] The rotor, the first radial bearing seat, the thrust disc, the first diffuser, the first radial bearing, the first axial bearing and the second axial bearing, the first radial bearing seat is located at the outer periphery of the partial shaft section of the rotor, the first radial bearing is arranged between the outer periphery of the rotor and the inner periphery of the first radial bearing seat to radially support the rotor; the first diffuser is located at the outer periphery of the partial shaft section of the rotor and along the axial direction of the rotor, the thrust disc is located between the first diffuser and the first radial bearing seat along the axial direction, the first axial bearing is arranged between the first diffuser and the thrust disc, and the second axial bearing is arranged between the thrust disc and the first radial bearing seat to be able to thrust the rotor.

[0008] The first diffuser has a flow passage inside, which can introduce cooling gas to the axial side end surface of the first axial bearing connected with the first diffuser, and cool and provide gas for supporting the first axial bearing.

[0009] In some embodiments,

[0010] The first diffuser is provided with a diffuser gas inlet, a first gas guide groove, a gas guide passage and a second gas guide groove, the diffuser gas inlet can introduce external cooling gas, the first gas guide groove is communicated between the diffuser gas inlet and the gas guide passage to be able to transport the gas to the gas guide passage through the first gas guide groove, the gas guide passage extends to the radial inner side of the first diffuser to be communicated with the second gas guide groove, the second gas guide groove is directed to the first axial bearing and can transport the cooling gas to the axial end surface of the first diffuser connected with the first axial bearing to cool and provide gas for supporting the first axial bearing.

[0011] In some embodiments,

[0012] The diffuser inlet extends from an axial side end surface of the first diffuser to the inside of the first diffuser in an axial direction, and the radial position of the diffuser inlet is located at the radial outer periphery of the first gas guide groove. The first gas guide groove is an annular groove, and the radial outer periphery of the first gas guide groove is connected to and communicates with the diffuser inlet at a position. The gas guide passage extends from the radial outer periphery of the first diffuser to the inside of the first diffuser in a radial direction. The radial direction of the gas guide passage is connected to the first gas guide groove through the gas guide inlet extending in the axial direction. The radial inner end of the gas guide passage is connected to the second gas guide groove through the gas guide outlet extending in the axial direction.

[0013] In some embodiments,

[0014] The second gas guide groove is arranged on the axial end surface of the first diffuser facing the first axial bearing and is recessed away from the first axial bearing. The second gas guide groove is a plurality of second gas guide grooves arranged at intervals in the circumferential direction of the first diffuser. The gas guide passage is also a plurality of gas guide passages arranged at intervals in the circumferential direction of the first diffuser, and the gas guide passage and the second gas guide groove are one-to-one corresponding and communicating.

[0015] In some embodiments,

[0016] In the projection plane of the axial end surface of the first diffuser, the shape of the second gas guide groove is a Z-shaped gas guide groove, including a gas guide groove outer periphery segment, a gas guide groove inner periphery segment, and a connecting segment. The gas guide groove outer periphery segment is located at the outer periphery of the gas guide groove inner periphery segment. The connecting segment is connected between the gas guide groove outer periphery segment and the gas guide groove inner periphery segment. The gas guide groove outer periphery segment extends in the circumferential direction by a first predetermined length, and the gas guide groove inner periphery segment extends in the circumferential direction by a second predetermined length.

[0017] In some embodiments,

[0018] The first axial bearing is provided with an axial bearing first inlet and an axial bearing second inlet in the axial direction. The radial positions of the axial bearing first inlet and the axial bearing second inlet do not exceed the position of the radial edge of the thrust disc. The axial bearing first inlet is located radially outside the axial bearing second inlet. There is a gap between the first axial bearing and the thrust disc in the axial direction, so that gas can be delivered between the first axial bearing and the thrust disc through the axial bearing first inlet and the axial bearing second inlet for cooling the first axial bearing and the thrust disc.

[0019] In some embodiments,

[0020] When the shape of the second gas guide groove is a Z-shaped gas guide groove including a gas guide groove outer peripheral section, a gas guide groove inner peripheral section, and a communication section in a projection plane of an axial end surface of the first diffuser, a first axial bearing is provided with a first axial bearing hollow structure along the axial direction, the first axial bearing hollow structure is located radially outside the first axial bearing gas inlet, the first axial bearing gas inlet and the second axial bearing gas inlet are opposite and communicate with the communication section of the second gas guide groove, the gas guide groove outer peripheral section is opposite and communicates with the first axial bearing hollow structure, the first axial bearing hollow structure communicates with the arch section of the first axial bearing, and is used to provide gas for supporting the first axial bearing; the radial position of the first axial bearing hollow structure is beyond the radial outer edge position of the thrust disc, so that cooling gas can be delivered to the second axial bearing through the first axial bearing hollow structure.

[0021] In some embodiments,

[0022] A third gas guide groove is formed on an axial end surface of the first radial bearing seat facing the second axial bearing, and the third gas guide groove is recessed in a direction away from the second axial bearing; the second axial bearing is provided with an axial bearing third gas inlet and an axial bearing fourth gas inlet along the axial direction, the radial positions of the axial bearing third gas inlet and the axial bearing fourth gas inlet are not beyond the radial edge position of the thrust disc, the axial bearing third gas inlet is located radially outside the axial bearing fourth gas inlet, the second axial bearing has a gap in the axial direction with the thrust disc, the third gas guide groove is opposite and communicates with the axial bearing third gas inlet and the axial bearing fourth gas inlet on the second axial bearing, so that gas can be supplied to the axial bearing third gas inlet and the axial bearing fourth gas inlet through the third gas guide groove, and the gas can be delivered to the second axial bearing and the thrust disc through the axial bearing third gas inlet and the axial bearing fourth gas inlet, and the third gas guide groove extends to the inner circumferential surface of the shaft hole of the first radial bearing seat in the radial direction, so as to further guide the gas to the first radial bearing provided in the inner circumferential surface of the shaft hole of the first radial bearing seat.

[0023] In some embodiments,

[0024] An axial end surface of the first radial bearing seat facing the second axial bearing is provided with a third air guide groove circumferential segment, an outer periphery of the third air guide groove communicates with the third air guide groove circumferential segment, the third air guide groove circumferential segment extends a third preset length in the circumferential direction, the third air guide groove and the third air guide groove circumferential segment form a T-shaped air guide groove, the second axial bearing is provided with a second axial bearing hollow structure penetrating in the axial direction, the second axial bearing hollow structure is located radially outward of the axial bearing third air inlet, the third air guide groove circumferential segment is opposite and communicates with the second axial bearing hollow structure on the second axial bearing, so that cooling gas can enter the third air guide groove circumferential segment through the second axial bearing hollow structure, and then enter the third air guide groove, the second axial bearing hollow structure also communicates with the arch foil segment of the second axial bearing, for providing gas for supporting the second axial bearing; the radial position of the second axial bearing hollow structure is beyond the radial outer edge position of the thrust disc, so that cooling gas transported from the first axial bearing can be received through the second axial bearing hollow structure.

[0025] In some embodiments,

[0026] Further comprising a casing and a stator, the stator is arranged inside the casing, the inside of the casing is provided with a cooling water flow channel, the inside of the casing is also provided with a cooling gas flow channel, the cooling gas flow channel does not communicate with the cooling water flow channel, and the cooling gas in the cooling gas flow channel can exchange heat with the cooling water in the cooling water flow channel; an axial one end of the casing is connected with an axial one side end surface of the first radial bearing seat, an axial other side end surface of the first radial bearing seat is connected with the first diffuser, and a first air guide through hole penetrating in the axial direction is arranged inside the first radial bearing seat, one end of the first air guide through hole communicates with the cooling gas flow channel, and the other end of the first air guide through hole communicates with a flow passage inside the first diffuser, so as to supply air to the flow passage inside the first diffuser.

[0027] In some embodiments,

[0028] When the first diffuser is provided with a diffuser air inlet, the other end of the first air guide through hole communicates with the diffuser air inlet, so as to supply air to the diffuser air inlet.

[0029] In some embodiments,

[0030] The second radial bearing seat is located at the outer periphery of the partial shaft section of the rotor, the second radial bearing is arranged between the outer periphery of the rotor and the inner periphery of the second radial bearing seat to radially support the rotor, the second radial bearing seat is axially spaced apart from the first radial bearing seat, the radially outer portion of the second diffuser is axially connected with the second radial bearing seat, the radially inner portion of the second diffuser is axially spaced apart from the second radial bearing seat to form a through space, the second radial bearing seat has a second gas guide through hole, one end of the second gas guide through hole is communicated with the cooling gas flow channel, the other end of the second gas guide through hole is communicated with the through space, and the through space is communicated with the second radial bearing to cool the second radial bearing and provide gas for supporting.

[0031] In some embodiments,

[0032] The gas passing through the first radial bearing enters the interior of the casing to cool the stator, the gas passing through the second radial bearing enters the interior of the casing to cool the stator and the rotor, and the gas entering the interior of the casing through the first radial bearing is mixed with the gas entering the interior of the casing through the second radial bearing.

[0033] The casing is further provided with a motor gas outlet, one end of the motor gas outlet is communicated with the interior of the casing, and the other end is communicated to the outside of the casing to guide the gas in the interior of the casing out.

[0034] The application further provides a compressor comprising the gas suspension motor.

[0035] In some embodiments,

[0036] The first diffuser is a first-stage diffuser, and the second diffuser is a second-stage diffuser, part of the gas compressed by the first-stage impeller and expanded by the first-stage diffuser enters the second-stage volute to be secondarily compressed, and part of the gas is guided to the cooling gas flow channel through the compressed gas outlet on the connecting pipe, the casing is further provided with a motor gas inlet, the compressed gas outlet is communicated with the motor gas inlet, and the motor gas inlet is communicated with the cooling gas flow channel.

[0037] The gas suspension motor and the compressor provided by the application have the following beneficial effects:

[0038] The application can introduce cooling gas to the axial side end surface (i.e. the back surface of the first axial bearing) of the first axial bearing connected with the first diffuser by arranging the flow passage inside the first diffuser, because the axial side end surface is a low pressure area, and the introduced cooling gas is high pressure, so that the introduced gas and the low pressure area form a pressure difference, the flow rate of the gas is increased, so that the cooling gas can smoothly conduct with the low pressure area of the diffuser and smoothly enter the inside of the axial bearing, the flow rate of the cooling gas is increased, and the heat dissipation efficiency can be effectively increased. The high pressure cooling gas can enter the inside of the bearing from the low pressure area of the back surface of the axial bearing due to the flow passage arranged inside the first diffuser, the structure can increase the flow speed of the cooling gas in the gas suspension foil bearing system and the whole machine air cooling system, thereby improving the convection heat dissipation efficiency of the foil bearing system and the whole machine, improving the operation stability and carrying capacity of the gas suspension bearing, reducing the demagnetization risk of the permanent magnet, solving the problem of large heat generation and difficult heat dissipation of the existing high-speed motor, and improving the operation stability and safety of the gas suspension high-speed motor and air compressor. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a sectional view of the gas suspension high-speed motor of the application;

[0040] Figure 2 is a sectional view of the whole machine air cooling system of the gas suspension high-speed motor and air compressor of the application;

[0041] Figure 2.1 is Figure 2 the local enlarged view of F part in

[0042] Figure 3 is a sectional view of the first diffuser of the application (radial plane sectional view through the axis);

[0043] Figure 3.1 is Figure 3 the A-A sectional view of

[0044] Figure 3.2 is Figure 3 the B-B sectional view of

[0045] Figure 4 is a sectional view of the first bearing seat along the axial direction of the application;

[0046] Figure 4.1 is Figure 4 the C-C sectional view of

[0047] Figure 5 is a sectional view of the first axial bearing of the application along the axial direction;

[0048] Figure 5.1 is Figure 5 the local enlarged view of D part in

[0049] Figure 5.2 is Figure 5 a partial enlarged view of E part of Fig. 1;

[0050] Figure 6 is a schematic view of a radial section of the first or second radial bearing of the application;

[0051] Figure 7 is a schematic view of an axial structure of the second axial bearing of the application.

[0052] The reference signs are:

[0053] 1, housing; 2, stator; 3, rotor; 4, first radial bearing seat; 5, second radial bearing seat; 6, first radial bearing; 7, second radial bearing; 8, first diffuser; 9, second diffuser; 10, first axial bearing; 11, second axial bearing; 12, thrust disc; 13, cooling water flow channel;

[0054] 14, first stage impeller; 15, second stage impeller; 16, first stage volute; 17, second stage volute; 18, connecting pipe; 19, compressed gas outlet; 20, motor air inlet; 21, cooling air flow channel; 22, first air guide through hole; 23, second air guide through hole; 24, motor air outlet;

[0055] 801, diffuser air inlet; 802, first air guide groove; 803, air guide channel; 804, air guide inlet; 805, air guide outlet; 806, second air guide groove; 807, outer peripheral section of air guide groove; 807', inner peripheral section of air guide groove; 808, first bearing mounting hole;

[0056] 401, third air guide groove; 402, circumferential section of third air guide groove; 403, second axial bearing mounting hole; 404, radial bearing mounting position;

[0057] 101, bearing mounting hole; 102, first axial bearing air inlet; 102', second axial bearing air inlet; 103, first axial bearing hollow structure; 104, third axial bearing air inlet; 104', fourth axial bearing air inlet; 105, second axial bearing hollow structure;

[0058] 25, bottom foil; 26, wave foil; 27, top foil; 28, arched hollow structure. DETAILED DESCRIPTION

[0059] Clearly, only the embodiments described are merely a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one example embodiment is merely illustrative in nature and is in no way intended to limit the application or its applications or uses. Based upon the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of the present application.

[0060] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0061] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application, unless otherwise specifically stated. It is to be understood that the drawings are not necessarily to scale as the dimensions of the parts shown are for the purpose of illustration and description only. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but are to be considered as part of the description of the application. In all examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation. Thus, other examples of the example embodiments can have different values. It is to be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0062] In the description of the application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, without the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the scope of protection of the application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0063] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0064] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0065] like Figures 1-7 As shown, the present invention provides an air-suspended motor (i.e., a motor in which the rotor is supported by a gas bearing), comprising:

[0066] The rotor 3, first radial bearing housing 4, thrust plate 12, first diffuser 8, first radial bearing 6, first axial bearing 10, and second axial bearing 11 are configured. The first radial bearing housing 4 is located on the outer periphery of a portion of the shaft of the rotor 3. The first radial bearing 6 is disposed between the outer periphery of the rotor 3 and the inner periphery of the first radial bearing housing 4 to provide radial support for the rotor 3. The first diffuser 8 is located on the outer periphery of a portion of the shaft of the rotor 3 and along the axial direction of the rotor 3. The thrust plate 12 is located between the first diffuser 8 and the first radial bearing housing 4 along the axial direction. The first axial bearing 10 is disposed between the first diffuser 8 and the thrust plate 12. The second axial bearing 11 is disposed between the thrust plate 12 and the first radial bearing housing 4 to provide thrust resistance for the rotor 3.

[0067] The first diffuser 8 has a flow channel inside, which can introduce cooling gas to the axial side end face of the first axial bearing 10 that is connected to the first diffuser 8, and cool the first axial bearing 10 and provide gas for support.

[0068] The application can introduce cooling gas to the axial side end surface (i.e. the back surface of the first axial bearing) of the first axial bearing connected with the first diffuser by arranging a flow passage inside the first diffuser, because the axial side end surface is a low pressure area, and the introduced cooling gas is high pressure, so that a pressure difference is formed between the introduced gas and the low pressure area, the flow rate of the gas is increased, the cooling gas can be smoothly conducted to the low pressure area of the diffuser and smoothly enter the inside of the axial bearing, the flow rate of the cooling gas is increased, and the heat dissipation efficiency can be effectively increased.

[0069] The improvement of the application is that:

[0070] 1. The gas-suspended high-speed motor and air compressor of the application has a compressed gas backflow internal circulation air cooling system, a cooling gas flow passage leading to the low pressure area of the back surface of the axial bearing is arranged in the first diffuser, the convective heat dissipation efficiency of the gas floating foil bearing system is improved, the risk of thermal instability of the foil bearing is reduced, and the stability of the bearing operation is improved.

[0071] 2. The internal circulation air cooling system of the gas-suspended high-speed motor and air compressor of the application is beneficial to improve the convective heat dissipation efficiency of the high-speed motor rotor, reduce the risk of thermal demagnetization of the permanent magnet, and improve the service life of the high-speed motor.

[0072] 3. The internal circulation air cooling system of the gas-suspended high-speed motor and air compressor of the application increases the gas flow through the gas-suspended bearing, and improves the load capacity of the gas floating foil bearing system.

[0073] The application solves the technical problem that in the existing high-speed motor, a high pressure gas film is formed between the thrust disc and the axial foil gas floating bearing, and between the shaft neck and the radial foil gas floating bearing when the high-speed motor is running at high speed, which can provide sufficient axial and radial load capacity for the high-speed rotor. However, at the same time, the existence of the high pressure gas film makes it difficult for cooling gas to enter the inside of the bearing, and the bearing foil cannot be effectively cooled, and the bearing foil is prone to uncontrollable thermal deformation under high temperature working conditions, thereby causing the problem of unstable operation of the system or even damage to the gas-suspended foil bearing.

[0074] In some embodiments,

[0075] The first diffuser 8 is provided with a diffuser air inlet 801, a first air guide groove 802, an air guide channel 803 and a second air guide groove 806. The diffuser air inlet 801 can introduce external cooling gas. The first air guide groove 802 is connected between the diffuser air inlet 801 and the air guide channel 803, so that the gas can be transported to the air guide channel 803 through the first air guide groove 802. The air guide channel 803 extends to the radial inner side of the first diffuser 8 and can be connected to the second air guide groove 806. The second air guide groove 806 is directed to the first axial bearing 10 and can transport cooling gas to the axial end surface of the first diffuser 8 and the first axial bearing 10, so as to cool the first axial bearing 10 and provide gas for support.

[0076] This is the preferred structure of the flow passage of the first diffuser of the application. The diffuser air inlet can introduce external cooling gas. The first air guide groove can be connected to the diffuser air inlet to guide the gas to the back surface of the first axial bearing which needs to be cooled. The air guide channel is used to connect the gas provided on the end surface of the first diffuser to the inside between the two axial end surfaces of the first diffuser, so that the external cooling gas can reach the specified position on the radial inner side, and then be connected to the second air guide groove. The cooling gas can be guided to the back surface of the first axial bearing through the second air guide groove to cool the first axial bearing and provide and replace the gas for support. (The provision of the air guide channel can avoid the situation that when the gas is introduced from the axial end surface of the first diffuser, the axial bearings on both sides of the thrust disc are in a high pressure area, so that the gas cannot be introduced to the specified position on the radial inner side of the axial bearing, thereby reliably and smoothly introducing the gas to the low pressure area on the radial inner side of the back surface of the axial bearing.) This can ensure effective cooling of the axial bearing and provision of support gas.

[0077] In some embodiments,

[0078] The diffuser air inlet 801 extends to the inside of the first diffuser 8 from the axial side end surface of the first diffuser 8. The radial position of the diffuser air inlet 801 is located at the radial outer periphery of the first air guide groove 802. The first air guide groove 802 is an annular groove, and one position of the radial outer periphery thereof is connected to and communicated with the diffuser air inlet 801. The air guide channel 803 extends to the inside of the first diffuser 8 from the radial outer periphery of the first diffuser 8. One position of the radial direction of the air guide channel 803 is connected to the first air guide groove 802 through the air guide inlet 804 extending in the axial direction. The radial inner end of the air guide channel 803 is connected to the second air guide groove 806 through the air guide outlet 805 extending in the axial direction.

[0079] This is a further preferred structure of the inlet, first gas guide groove and gas guide passage of the diffuser of the application. The diffuser inlet preferably extends in the axial direction to introduce gas from the outside to the inside in the axial direction. The first gas guide groove is an annular groove that can communicate with the diffuser inlet to guide the gas to different positions in the circumferential direction of the first diffuser to supply gas to different positions in the circumferential direction of the back surface of the axial bearing. The gas guide passage is preferably formed in the radial direction and can be machined from the outer circumferential surface of the first diffuser in the radial direction inward. The gas guide passage formed at a certain position in the circumferential direction can communicate with the annular groove to guide the gas and communicate with the second gas guide groove to the position at the radial inner end. The gas guide passage communicates with the first gas guide groove through the gas guide inlet and communicates with the second gas guide groove through the gas guide outlet, thereby guiding the gas from the radial outer side to the radial inner side of the first diffuser and communicating with the back surface of the first axial bearing to spray gas on the back surface of the axial bearing to cool and replace the gas used for support.

[0080] In some embodiments,

[0081] The second gas guide groove 806 is arranged on the axial end surface of the first diffuser 8 facing the first axial bearing 10 and is recessed away from the first axial bearing 10. The second gas guide groove 806 is a plurality of grooves arranged at intervals in the circumferential direction of the first diffuser 8. The gas guide passage 803 is also a plurality of passages arranged at intervals in the circumferential direction of the first diffuser 8 and corresponds to and communicates with the second gas guide groove 806.

[0082] This is a preferred structure of the second gas guide groove of the application, which is recessed on the axial end surface of the first diffuser and the first axial bearing and can communicate with the gas guide passage to spray cooling gas on different positions of the axial bearing. The second gas guide groove of the application is preferably a plurality of grooves, and the gas guide passage is also a plurality of passages, which can be distributed at different positions in the circumferential direction to spray cooling gas on multiple positions in the circumferential direction of the axial bearing to improve the cooling effect of the axial bearing and improve the support performance.

[0083] In some embodiments,

[0084] In the projection plane of the axial end surface of the first diffuser 8, the second air guide groove 806 is in the shape of a Z-shaped air guide groove, comprising an air guide groove outer peripheral section 807, an air guide groove inner peripheral section 807', and a communication section, the air guide groove outer peripheral section 807 is located at the outer periphery of the air guide groove inner peripheral section 807', the communication section is communicated between the air guide groove outer peripheral section 807 and the air guide groove inner peripheral section 807'; and the air guide groove outer peripheral section 807 extends in the circumferential direction by a first preset length, and the air guide groove inner peripheral section 807' extends in the circumferential direction by a second preset length.

[0085] This is a further preferred structure of the second air guide groove of the application, by extending the air guide groove outer peripheral section in the circumferential direction by a first preset length, the cooling gas can flow out of the hollow structure of the second axial bearing and enter the third air guide groove from the third air guide groove circumferential section, to cool the second axial bearing and provide gas for support; by extending the air guide groove inner peripheral section in the circumferential direction by a second preset length, the air guide groove inner peripheral section has a certain gas storage capacity, and the injection area in the circumferential direction of the axial bearing is increased, further improving the cooling effect and support performance of the bearing.

[0086] As shown in Figure 3 The features of the first diffuser 8 include a diffuser inlet 801, a first air guide groove 802, uniformly distributed air guide channels 803 that are communicated in the radial direction of the first diffuser 8, uniformly distributed Z-shaped grooves (second air guide grooves 806), the bottom of the first air guide groove 802 and the bottom of the second air guide groove 806 are in the same plane (parallel to the end surface of the first diffuser 8), the air guide channels 803 are communicated between the first air guide groove 802 and the second air guide groove 806 in the radial direction of the first diffuser 8; the air guide channels 803 are provided with air guide inlets 804 and air guide outlets 805, the air guide inlets 804 are located at the axial bottom of the first air guide groove 802, and the air guide outlets 805 are located at the axial bottom of the second air guide groove 806; the side of the second air guide groove 806 away from the center is provided with an air guide groove outer peripheral section 807 and an air guide groove inner peripheral section 807' located on the inner side in the radial direction; the first diffuser 8 is also provided with a first bearing mounting hole 808 for mounting the first axial bearing 10.

[0087] The diffuser inlet 801, the first gas guide through hole 22 and the cooling gas flow channel 13 are in axial communication, cooling gas enters the first gas guide groove 802 from the diffuser inlet 801 and completes the compression air homogenization in the annular first gas guide groove 802; the cooling gas enters from the gas guide inlet 804 and is transported along the gas guide channel 803 to the gas guide outlet 805, enters the Z-shaped gas guide groove and finally flows to the gas guide groove outer peripheral section 807; the second gas guide groove 806 is opposite to the back of the first axial bearing, and the gas guide groove outer peripheral section 807 is opposite to and communicates with the first axial bearing hollow structure 103. Part of the high-pressure cooling gas enters between the first axial bearing 10 and the thrust disc 12 from the first axial bearing first gas inlet 102 and the first axial bearing second gas inlet 102', provides cooling gas for the axial bearing, cools the first axial bearing 10, and also provides sufficient gas source for the high-pressure gas film formed between the first axial bearing and the thrust disc, thereby improving the load capacity of the axial bearing; another part enters the back of the first axial bearing 10 from the gap between the first axial bearing 10 and the first-stage diffuser 8 with lower gas pressure, and enters the inside of the bearing through the gap between the foils of the first axial bearing 10, thereby cooling the first axial bearing 10 in all aspects. The gas guide groove outer peripheral section 807 is at least partially opposite to the first axial bearing hollow structure 103 of the first axial bearing 10, and the cooling gas can directly enter the first-stage diffuser inner cavity formed between the first diffuser 8 and the first radial bearing seat 4.

[0088] In some embodiments,

[0089] The first axial bearing 10 is provided with the axial bearing first gas inlet 102 and the axial bearing second gas inlet 102' along the axial direction, the radial positions of the axial bearing first gas inlet 102 and the axial bearing second gas inlet 102' do not exceed the position of the radial edge of the thrust disc 12, the axial bearing first gas inlet 102 is located radially outside the axial bearing second gas inlet 102', and there is a gap between the first axial bearing 10 and the thrust disc 12 in the axial direction, so that the gas can be transported between the first axial bearing 10 and the thrust disc 12 through the axial bearing first gas inlet 102 and the axial bearing second gas inlet 102', for cooling the first axial bearing 10 and the thrust disc 12.

[0090] This is the preferred structure of the first axial bearing of the present application, through the axial bearing first gas inlet and the axial bearing second gas inlet being opposite to the second gas guide groove and the thrust disc solid part, the cooling gas can be conducted to between the thrust disc and the first axial bearing, the amount of gas used for cooling and supporting is increased, the cooling performance between the first axial bearing and the thrust disc is improved, and the supporting performance is also improved.

[0091] In some embodiments,

[0092] When the shape of the second air guide groove 806 is a Z-shaped air guide groove, including an air guide groove outer peripheral section 807, an air guide groove inner peripheral section 807', and a communication section, in the projection plane of the axial end surface of the first diffuser 8, the first axial bearing 10 is provided with a first axial bearing hollow structure 103 along the axial direction, the first axial bearing hollow structure 103 is located radially outward of the axial bearing first air inlet 102, the axial bearing first air inlet 102 and the axial bearing second air inlet 102' are opposite and communicate with the communication section of the second air guide groove 806, the air guide groove outer peripheral section 807 is opposite and communicates with the first axial bearing hollow structure 103, the first axial bearing hollow structure 103 communicates with the arch foil section of the first axial bearing 10, for providing gas for supporting the first axial bearing 10; the radial position of the first axial bearing hollow structure 103 is beyond the radial outer edge position of the thrust disc 12, so that cooling gas can be delivered to the second axial bearing 11 through the first axial bearing hollow structure 103.

[0093] This is the preferred structure of the first and second axial bearing air inlets of the first axial bearing of the present application. Through the first axial bearing hollow structure, it can communicate with the air guide groove outer peripheral section, a part of the gas communicates with the arch foil section of the first axial bearing on the radial inner side through the first axial bearing hollow structure, for providing gas for supporting the arch foil section, another part of the gas can be guided to the cavity between the first diffuser and the first radial bearing seat due to the first axial bearing hollow structure beyond the radial outer edge of the thrust disc, thereby being able to supply gas to the second axial bearing, improving the cooling performance and supporting performance of the second axial bearing; the second axial bearing hollow structure communicates with the first axial bearing hollow structure, and gas can be introduced through the hollow structures of the two bearings, and further guided to the position between the second axial bearing and the thrust disc through the third and fourth air inlets of the axial bearing, improving the cooling and supporting performance of the position.

[0094] In some embodiments,

[0095] The axial end face of the first radial bearing seat 4 facing the second axial bearing 11 is provided with a third air guide groove 401 recessed in a direction away from the second axial bearing 11; the second axial bearing 11 is provided with an axial bearing third air inlet 104 and an axial bearing fourth air inlet 104' along the axial direction, the radial positions of the axial bearing third air inlet 104 and the axial bearing fourth air inlet 104' do not exceed the position of the radial edge of the thrust disc 12, the axial bearing third air inlet 104 is located radially outside the axial bearing fourth air inlet 104', the second axial bearing 11 and the thrust disc 12 have an axial gap, the third air guide groove 401 is opposite and communicated with the axial bearing third air inlet 104 and the axial bearing fourth air inlet 104' on the second axial bearing 11, so as to supply air to the axial bearing third air inlet 104 and the axial bearing fourth air inlet 104' through the third air guide groove 401, and deliver the air to the space between the second axial bearing 11 and the thrust disc 12 through the axial bearing third air inlet 104 and the axial bearing fourth air inlet 104', and the third air guide groove 401 extends to the inner circumferential wall of the shaft hole of the first radial bearing seat 4 in the radial direction, so as to further guide the air to the first radial bearing 6 provided on the inner circumferential wall of the shaft hole of the first radial bearing seat 4.

[0096] This is the preferred structure of the first radial bearing seat of the application, the third air guide groove can deliver cooling air, the third air guide groove is opposite and communicated with the axial bearing third air inlet and the axial bearing fourth air inlet of the second axial bearing, so as to supply cooling air and air for supporting to the second axial bearing through the axial bearing third and fourth air inlets, and the third air guide groove also extends to the inner circumferential wall of the shaft hole of the first radial bearing seat in the radial direction, so as to guide the air to the first radial bearing, so as to further cool and improve the supporting capacity of the first radial bearing.

[0097] The high-speed motor and air compressor of the application is provided with a cooling air flow channel leading to the low-pressure area on the back surface of the axial bearing in the first-stage diffuser and the first-stage radial bearing seat, which can improve the convective heat dissipation efficiency of the gas suspension high-speed motor and air compressor, the gas suspension bearing system and the whole machine, improve the operation stability and carrying capacity of the gas suspension bearing, reduce the risk of demagnetization of the permanent magnet, and thus improve the operation stability and safety of the high-speed motor and air compressor.

[0098] The left part gas cooling structure of the foil bearing cooling system can firstly make the cooling gas enter the bearing structure from the back of the axial bearing, provide the bearing with cooling and dynamic pressure high pressure gas film gas source, and can also guide the cooling gas to the arched hollow structure of the radial bearing, provide cooling for the first radial bearing 6, and finally, the airflow channel of the left part gas cooling structure is arranged at the arched hollow structure inside the radial bearing and the back of the axial bearing with relatively smaller gas pressure and dynamic pressure gas film, so that the flow resistance of the cooling gas is smaller and the flow speed is faster, thereby providing higher convective heat dissipation efficiency for the foil bearing system.

[0099] In some embodiments,

[0100] An axial end surface of the first radial bearing seat 4 facing the second axial bearing 11 is provided with a third air guide groove circumferential segment 402, an outer periphery of the third air guide groove 401 communicates with the third air guide groove circumferential segment 402, the third air guide groove circumferential segment 402 extends a third preset length in the circumferential direction, the third air guide groove 401 and the third air guide groove circumferential segment 402 form a T-shaped air guide groove, the second axial bearing 11 is provided with a second axial bearing hollow structure 105 penetrating along the axial direction, the second axial bearing hollow structure 105 is located radially outward of the third air inlet 104 of the axial bearing, the third air guide groove circumferential segment 402 is opposite and communicates with the second axial bearing hollow structure 105 on the second axial bearing 11, so that the cooling gas can enter the third air guide groove circumferential segment 402 through the second axial bearing hollow structure 105, thereby entering the third air guide groove 401, and the second axial bearing hollow structure 105 also communicates with the arched foil segment of the second axial bearing 11, for providing the second axial bearing 11 with gas for supporting; the radial position of the second axial bearing hollow structure 105 is beyond the radial outer edge position of the thrust disc 12, so as to receive the cooling gas delivered from the first axial bearing 10 through the second axial bearing hollow structure 105.

[0101] This is a further preferred structure of the first radial bearing seat of the application, through the third gas guide groove circumferential segment located at the radial outer end of the third gas guide groove, the third gas guide groove circumferential segment can be opposite to the second axial bearing hollow structure to absorb the cooling gas flowing through, the third gas guide groove circumferential segment is communicated with the third gas guide groove to enable the gas to be guided to the third gas guide groove, the third gas guide groove is opposite to the third gas inlet and the fourth gas inlet of the second axial bearing in the axial direction to enable the gas to be introduced between the second axial bearing and the thrust disc to cool and lubricate the position, and part of the gas of the second axial bearing hollow structure is communicated to the arch foil segment in the radial direction to provide the gas for supporting the second axial bearing, the third gas guide groove circumferential segment extends a third preset length in the circumferential direction, and the third gas guide groove circumferential segment can be opposite to and communicated with the axial bearing hollow structure to provide the third gas guide groove with a cooling gas inlet.

[0102] As Figure 4 shown, the first radial bearing seat 4 includes uniformly distributed third gas guide grooves 401 that are guided in the radial direction of the first radial bearing seat 4, third gas guide groove circumferential segments 402 that are away from the center of the first radial bearing seat 4, second axial bearing mounting holes 403, and radial bearing mounting positions 404. The third gas guide groove circumferential segments 402 are at least partially opposite to the second axial bearing hollow structure 105 on the second axial bearing 11, and the high-pressure cooling gas in the first-stage pressure expander inner cavity can enter the third gas guide grooves 401 through the third gas guide groove circumferential segments 402. Part of the high-pressure cooling gas enters between the second axial bearing 11 and the thrust disc 12 from the third gas inlet 104 and the fourth gas inlet 104' of the axial bearing, provides cooling gas for the axial bearing, cools the second axial bearing 11, and also provides sufficient gas source for forming a high-pressure gas film between the front axial bearing and the thrust disc 12, thereby improving the carrying capacity of the axial bearing. Another part enters the back of the second axial bearing 11 from the gap between the second axial bearing 11 and the first radial bearing seat 4 with lower gas pressure, and enters the inside of the bearing through the gap between the foil sheets of the second axial bearing 11, thereby cooling the second axial bearing 11 in all aspects.

[0103] In some embodiments,

[0104] The application also comprises a casing 1 and a stator 2 arranged inside the casing 1, wherein the casing 1 is provided with a cooling water flow channel 13 and a cooling gas flow channel 21 which is not communicated with the cooling water flow channel 13 and the cooling gas in the cooling gas flow channel 21 can exchange heat with the cooling water in the cooling water flow channel 13; one axial end of the casing 1 is connected with one axial end surface of the first radial bearing seat 4, and the other axial end surface of the first radial bearing seat 4 is connected with the first diffuser 8; a first gas guide through hole 22 is arranged in the first radial bearing seat 4 along the axial direction, one end of the first gas guide through hole 22 is communicated with the cooling gas flow channel 21, and the other end is communicated with a flow channel inside the first diffuser 8, so as to supply gas to the flow channel inside the first diffuser 8.

[0105] The application also comprises a casing and a cooling gas flow channel arranged thereon, which is not communicated with a cooling water flow channel and the medium of the two can exchange heat, so that the temperature of the cooling gas can be further reduced by the cooling water, thereby further improving the cooling and supporting effect on the bearings and other components in multiple positions inside, and the cooling gas flow channel can guide the cooling gas to the flow channel inside the first diffuser through the first gas guide through hole of the first radial bearing seat, thereby providing conditions for air injection to the low pressure area at the back of the first axial bearing, and improving the cooling performance and supporting capacity.

[0106] In some embodiments,

[0107] When the diffuser gas inlet 801 is arranged on the first diffuser 8, the other end of the first gas guide through hole 22 is communicated with the diffuser gas inlet 801, so as to supply gas to the diffuser gas inlet 801. This is a further preferred structure of the application, that is, the first gas guide through hole is opposite to and communicated with the diffuser gas inlet, the cooling gas is guided to the inside of the first diffuser through the diffuser gas inlet, so as to provide conditions for gas supply to the low pressure area at the back of the axial bearing, thereby improving the cooling and supporting capacity.

[0108] In some embodiments,

[0109] The second radial bearing seat 5 is located on the outer periphery of the partial shaft section of the rotor 3, the second radial bearing 7 is arranged between the outer periphery of the rotor 3 and the inner periphery of the second radial bearing seat 5 to radially support the rotor 3, the second radial bearing seat 5 is axially spaced apart from the first radial bearing seat 4, the radially outer portion of the second diffuser 9 is axially connected with the second radial bearing seat 5, the radially inner portion of the second diffuser 9 is axially spaced apart from the second radial bearing seat 5 to form a conduction space, the inside of the second radial bearing seat 5 has a second gas guide hole 23, one end of the second gas guide hole 23 is communicated with the cooling gas flow channel 21, the other end of the second gas guide hole 23 is communicated with the conduction space, and the conduction space is communicated with the second radial bearing 7 to cool and provide gas for supporting the second radial bearing 7.

[0110] Preferably, in the radial section passing through the axis of the rotor, the second gas guide hole 23 is preferably L-shaped.

[0111] The application can support the other axial position of the rotor through the second radial bearing seat, the second radial bearing, the second diffuser is used for diffusing the gas compressed by the second-stage impeller, and the second gas guide hole is formed in the inside of the second radial bearing seat, one end of the second gas guide hole is communicated with the cooling gas flow channel, and the other end of the second gas guide hole is communicated with the conduction space, so that the cooling gas can be conducted into the conduction space and further into the second radial bearing to cool and support the second radial bearing, thereby improving the cooling performance and supporting effect of the second radial bearing.

[0112] As shown in Figure 6 The cross-sectional view of the radial bearing is shown, characterized in that a bottom foil 25 and a top foil 27 are provided, a double-layered wave foil 26 is arranged between the bottom foil 25 and the top foil 27, and an arc-shaped hollow structure 28 is formed between the wave foil 26 and the bottom foil 25 and the top foil 27; the first radial bearing 6 with the above structure is installed on the radial bearing mounting position 404 of the first radial bearing seat, the high-pressure cooling gas entering the rear axial bearing back space from the third gas guide groove circumferential section 402 can pass through the arc-shaped hollow structure 28 to provide cooling for the first radial bearing foil, and then enter the motor inner cavity.

[0113] In some embodiments,

[0114] The gas after passing through the first radial bearing 6 enters the inside of the machine shell 1 to cool the stator 2, and the gas after passing through the second radial bearing 7 enters the inside of the machine shell 1 to cool the stator 2 and the rotor 3, and the gas after passing through the first radial bearing 6 enters the inside of the machine shell 1 to mix with the gas after passing through the second radial bearing 7;

[0115] The machine shell 1 is further provided with a motor gas outlet 24, one end of the motor gas outlet 24 is in communication with the inside of the machine shell 1, and the other end is communicated to the outside of the machine shell 1, so that the gas in the inside of the machine shell 1 can be discharged.

[0116] The present application also cools the stator and the rotor by contacting the gas from the first radial bearing and the gas from the second radial bearing with the stator and the rotor in the machine shell, mixes in the machine shell, and discharges to the outside of the machine shell through the motor gas outlet, which can effectively introduce the gas between the first stage and the second stage to cool and support the bearing part, and discharge to the outside of the machine shell after completing the cooling and supporting effect.

[0117] As shown in Figure 2 The right part of the foil bearing cooling system includes an L-shaped gas guide hole (second gas guide hole 23) arranged on the second radial bearing seat 5, a two-stage pressure expansion cavity between the second radial bearing seat 5 and the second pressure expander 9, and an arch-shaped hollow structure 28 of the second radial bearing 7. The high-temperature and high-pressure gas flows into the two-stage pressure expansion cavity from the L-shaped gas guide hole after water cooling, and is homogenized here, then enters the arch-shaped hollow structure 28 of the second radial bearing to cool the second radial bearing, and then enters the motor cavity, flows from the air gap between the stator 2 and the rotor 3 to one end of the first radial bearing seat 4, and merges with the gas flowing out of the left part of the foil bearing cooling system to be discharged to the atmosphere from the motor gas outlet 24 located on the machine shell 1 close to one end of the first radial bearing seat 4.

[0118] The present application also provides a compressor (preferably an air compressor) comprising the aforementioned gas suspension motor.

[0119] The present application provides a high-speed motor and an air compressor, which has a cooling gas flow channel arranged on a first-stage pressure expander and a first-stage radial bearing, and high-pressure cooling gas can enter the inside of the bearing from the back of the axial bearing, which can increase the flow speed of the cooling gas in the gas suspension foil bearing system and the whole machine gas cooling system, thereby improving the convective heat dissipation efficiency of the foil bearing system and the whole machine, solving the problem of large heat generation and difficult heat dissipation of the existing high-speed motor, and improving the operation stability and safety of the gas suspension high-speed motor and air compressor.

[0120] In some embodiments,

[0121] It also includes a first-stage impeller 14, a first-stage volute 16, a second-stage impeller 15, and a second-stage volute 17. The first-stage impeller 14 and the first diffuser 8 are both disposed inside the first-stage volute 16, and the second-stage impeller 15 and the second diffuser 9 are both disposed inside the second-stage volute 17. The first diffuser 8 is a first-stage diffuser, and the second diffuser 9 is a second-stage diffuser. Part of the gas compressed by the first-stage impeller 14 and diffused by the first-stage diffuser enters the second-stage volute 17 for secondary compression, and part of it is guided to the cooling airflow channel 21 through the compressed gas outlet 19 on the connecting pipe 18. The housing 1 is also provided with a motor air inlet 20. The compressed gas outlet 19 is connected to the motor air inlet 20, and the motor air inlet 20 is connected to the cooling airflow channel 21.

[0122] This invention improves the cooling performance and support effect of the axial bearing by introducing a portion of the gas between the first and second stages into the housing, and then guiding the cooling gas into the first diffuser and the second diffuser through cooling airflow channels. The cooling gas is then guided to the low-pressure area on the back of the first axial bearing through the channels inside the first diffuser, as well as improving the cooling performance and support capacity of the first and second radial bearings.

[0123] This invention proposes an air-suspended high-speed motor and an air compressor, such as... Figures 1-2 As shown, it includes a housing 1, a stator 2, and a rotor 3; a first radial bearing seat 4 (i.e., a primary radial bearing seat) and a first radial bearing seat 5 (i.e., a secondary radial bearing seat) supporting the rotor 3 are respectively installed inside and mounted at both ends of the housing 1. A first radial bearing 6 (i.e., a primary radial bearing) and a second radial bearing 7 (i.e., a secondary radial bearing) are respectively mounted on the first radial bearing seat 4 and the first radial bearing seat 5. The first radial bearing 6 and the second radial bearing 7 are air-suspended foil bearings; a first diffuser 8 (i.e., a primary diffuser) and a second diffuser 9 (i.e., a secondary diffuser) are respectively installed on the left and right sides of the housing 1; a first axial bearing 6 (i.e., a front axial bearing) and a second axial bearing 11 (i.e., a rear axial bearing) are also present. The rotor 3 is equipped with a first diffuser 8 and a first radial bearing seat 4 on the left and right sides respectively. The first axial bearing 10 and the second axial bearing 11 are air-suspended foil thrust bearings. The first radial bearing seat 4 and the first diffuser 8, the second radial bearing seat 5 and the second diffuser 9 pass through the left and right ends respectively, and a first-stage impeller 14 and a second-stage impeller 15 are installed on them respectively. The rotor 3 is provided with an interference fit thrust plate 12, which is arranged between the first axial bearing 10 and the second axial bearing 11. A first-stage volute 16 and a second-stage volute 17 are installed on the outer side of the first-stage impeller 14 and the second-stage impeller 15 respectively. The first-stage volute 16 and the second-stage volute 17 are connected by a connecting pipe 18.

[0124] The shell 1 is provided with cooling water flow channel 13, the cooling water flow channel 13 is along the shell 1 circumferential S type back and forth, for high-speed motor and air compressor to provide cooling water, cooling gas flow channel 21 is arranged between the cooling water flow channel 13 along the shell 1 axial direction, into the shell high temperature and high pressure gas can be cooled by cooling water to low temperature in cooling gas flow channel 21.

[0125] After the first compression of high temperature and high pressure gas, most of them enter the second compression through the connecting pipe 18, another part through the compressed gas outlet 19 on the connecting pipe 18 into the cooling gas flow channel 21 through the motor air inlet 20, the compressed gas outlet 19 and motor air inlet 20 are connected by pipeline, after cooling, high pressure gas respectively through the first radial bearing seat 4 on the first gas guide hole 22, and the second radial bearing seat 5 on the L type gas guide hole (second gas guide hole 23), into the left and right of high-speed motor and air compressor foil bearing cooling system.

[0126] The above only for the preferred embodiments of the present application, and not to limit the present application, any modification, equivalent replacement and improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application. The above only is the preferred embodiment of the present application, it should be pointed out, for ordinary skilled in the art, without departing from the technical principles of the present application, can make a number of improvements and variations, these improvements and variations should be considered as the protection scope of the present application.

Claims

1. An air-suspended motor, characterized by: Comprise: The rotor (3), the first radial bearing seat (4), the thrust disc (12), the first diffuser (8), the first radial bearing (6), the first axial bearing (10) and the second axial bearing (11), the first radial bearing seat (4) is located on the outer periphery of the partial shaft section of the rotor (3), the first radial bearing (6) is arranged between the outer periphery of the rotor (3) and the inner periphery of the first radial bearing seat (4) to support the rotor (3) in the radial direction; The first diffuser (8) is located on the outer periphery of the partial shaft section of the rotor (3), and along the axial direction of the rotor (3), the thrust disc (12) is located between the first diffuser (8) and the first radial bearing seat (4) along the axial direction, the first axial bearing (10) is arranged between the first diffuser (8) and the thrust disc (12), and the second axial bearing (11) is arranged between the thrust disc (12) and the first radial bearing seat (4) to support the rotor (3) in the thrust direction; The first diffuser (8) has a flow passage inside, which can introduce cooling gas to the axial side end surface of the first axial bearing (10) connected with the first diffuser (8), and cool and provide gas for supporting the first axial bearing (10); The first diffuser (8) is provided with a diffuser gas inlet (801), a first gas guide groove (802), a gas guide channel (803) and a second gas guide groove (806), the diffuser gas inlet (801) can introduce external cooling gas, the first gas guide groove (802) is communicated between the diffuser gas inlet (801) and the gas guide channel (803), so that the gas can be transported to the gas guide channel (803) through the first gas guide groove (802), the gas guide channel (803) extends to the radial inner side of the first diffuser (8) to communicate with the second gas guide groove (806), the second gas guide groove (806) is directed to the first axial bearing (10) and can transport cooling gas to the axial end surface of the first diffuser (8) connected with the first axial bearing (10), so as to cool and provide gas for supporting the first axial bearing (10).

2. The gas suspension motor according to claim 1, characterized in that: The diffuser inlet (801) extends to the inside of the first diffuser (8) from the axial side end surface of the first diffuser (8) in the axial direction, the radial position of the diffuser inlet (801) is located at the radial outer periphery of the first air guide groove (802), the first air guide groove (802) is an annular groove, and the radial outer periphery of the first air guide groove (802) is connected and communicated with the diffuser inlet (801) at a position, the air guide channel (803) extends to the inside of the first diffuser (8) from the radial outer periphery of the first diffuser (8) in the radial direction, the radial direction of the air guide channel (803) is communicated with the first air guide groove (802) through the axially extending air guide inlet (804) at a position, and the radial inner end of the air guide channel (803) is communicated with the second air guide groove (806) through the axially extending air guide outlet (805).

3. The gas suspension motor according to claim 1, characterized in that: The second air guide groove (806) is arranged on the axial end surface of the first diffuser (8) facing the first axial bearing (10) and is recessed away from the first axial bearing (10), the second air guide groove (806) is a plurality of second air guide grooves (806) arranged at intervals along the circumferential direction of the first diffuser (8); the air guide channel (803) is also a plurality of air guide channels (803) arranged at intervals along the circumferential direction of the first diffuser (8), and the air guide channel (803) and the second air guide groove (806) are one-to-one corresponding and communicated.

4. The gas suspension motor according to claim 1, characterized in that: In the projection plane of the axial end surface of the first diffuser (8), the shape of the second air guide groove (806) is a Z-shaped air guide groove, including an air guide groove outer periphery section (807), an air guide groove inner periphery section (807'), and a communication section, the air guide groove outer periphery section (807) is located at the outer periphery of the air guide groove inner periphery section (807'), the communication section is communicated between the air guide groove outer periphery section (807) and the air guide groove inner periphery section (807'); and the air guide groove outer periphery section (807) extends in the circumferential direction by a first predetermined length, and the air guide groove inner periphery section (807') extends in the circumferential direction by a second predetermined length.

5. The gas suspension motor according to any one of claims 1-4, characterized in that: The first axial bearing (10) is provided with an axial bearing first air inlet (102) and an axial bearing second air inlet (102') along the axial direction, the radial positions of the axial bearing first air inlet (102) and the axial bearing second air inlet (102') do not exceed the position of the radial edge of the thrust disc (12), the axial bearing first air inlet (102) is located radially outside the axial bearing second air inlet (102'), and the first axial bearing (10) has a gap in the axial direction with the thrust disc (12) to enable the gas to be delivered to the space between the first axial bearing (10) and the thrust disc (12) through the axial bearing first air inlet (102) and the axial bearing second air inlet (102') for cooling the first axial bearing (10) and the thrust disc (12).

6. The gas suspension motor according to claim 5, characterized in that: When the shape of the second air guide groove (806) is a Z-shaped air guide groove including an air guide groove outer peripheral section (807), an air guide groove inner peripheral section (807'), and a communication section in the projection plane of the axial end surface of the first diffuser (8), the first axial bearing (10) is provided with a first axial bearing hollow structure (103) along the axial direction, the first axial bearing hollow structure (103) is located radially outside the axial bearing first air inlet (102), the axial bearing first air inlet (102) and the axial bearing second air inlet (102') are opposite and communicate with the communication section of the second air guide groove (806), the air guide groove outer peripheral section (807) is opposite and communicates with the first axial bearing hollow structure (103), the first axial bearing hollow structure (103) communicates with the arch foil section of the first axial bearing (10) to provide gas for supporting the first axial bearing (10); the radial position of the first axial bearing hollow structure (103) exceeds the position of the radial outer edge of the thrust disc (12) to enable the cooling gas to be delivered to the second axial bearing (11) through the first axial bearing hollow structure (103).

7. The gas suspension motor according to claim 1, characterized in that: The axial end face of the first radial bearing seat (4) facing the second axial bearing (11) is provided with a third air guide groove (401) recessed away from the second axial bearing (11); the second axial bearing (11) is provided with an axial bearing third air inlet (104) and an axial bearing fourth air inlet (104') penetrating along the axial direction, the radial positions of the axial bearing third air inlet (104) and the axial bearing fourth air inlet (104') do not exceed the position of the radial edge of the thrust disc (12), the axial bearing third air inlet (104) is located radially outside the axial bearing fourth air inlet (104'), the second axial bearing (11) and the thrust disc (12) have an axial gap, the third air guide groove (401) is opposite and communicated with the axial bearing third air inlet (104) and the axial bearing fourth air inlet (104') on the second axial bearing (11), so that the third air guide groove (401) can supply air to the axial bearing third air inlet (104) and the axial bearing fourth air inlet (104'), and the air can be delivered to the second axial bearing (11) and the thrust disc (12) through the axial bearing third air inlet (104) and the axial bearing fourth air inlet (104'), the third air guide groove (401) extends to the inner circumferential wall of the shaft hole of the first radial bearing seat (4) radially inward, so as to further guide the air to the first radial bearing (6) provided on the inner circumferential wall of the shaft hole of the first radial bearing seat (4).

8. The gas suspension motor according to claim 7, characterized in that: The axial end face of the first radial bearing seat (4) facing the second axial bearing (11) is provided with a third air guide groove circumferential section (402), the outer periphery of the third air guide groove (401) communicates with the third air guide groove circumferential section (402), the third air guide groove circumferential section (402) extends along the circumferential direction by a third preset length, the third air guide groove (401) and the third air guide groove circumferential section (402) form a T-shaped air guide groove, the second axial bearing (11) is provided with a second axial bearing hollow structure (105) penetrating along the axial direction, the second axial bearing hollow structure (105) is located radially outward of the axial bearing third air inlet (104), the third air guide groove circumferential section (402) is opposite and communicates with the second axial bearing hollow structure (105) on the second axial bearing (11), so that cooling gas can enter the third air guide groove circumferential section (402) through the second axial bearing hollow structure (105), and then enter the third air guide groove (401), the second axial bearing hollow structure (105) also communicates with the arch foil section of the second axial bearing (11), and is used for providing gas for supporting the second axial bearing (11); the radial position of the second axial bearing hollow structure (105) is beyond the radial outer edge position of the thrust disc (12), so that cooling gas transported from the first axial bearing (10) can be received through the second axial bearing hollow structure (105).

9. The gas suspension motor according to any one of claims 1-4, characterized in that: Further comprising a machine shell (1) and a stator (2), the stator (2) is arranged in the interior of the machine shell (1), the interior of the machine shell (1) is provided with a cooling water flow channel (13), the interior of the machine shell (1) is further provided with a cooling gas flow channel (21), the cooling gas flow channel (21) does not communicate with the cooling water flow channel (13), the cooling gas in the cooling gas flow channel (21) can exchange heat with the cooling water in the cooling water flow channel (13); one axial end of the machine shell (1) is connected with one axial side end face of the first radial bearing seat (4), the other axial side end face of the first radial bearing seat (4) is connected with the first diffuser (8), a first air guide through hole (22) penetrating along the axial direction is arranged in the interior of the first radial bearing seat (4), one end of the first air guide through hole (22) communicates with the cooling gas flow channel (21), the other end of the first air guide through hole (22) communicates with a flow passage in the interior of the first diffuser (8), so as to supply air to the flow passage in the interior of the first diffuser (8).

10. The gas suspension motor according to claim 9, characterized in that: When the first diffuser (8) is provided with a diffuser air inlet (801), the other end of the first air guide through hole (22) communicates with the diffuser air inlet (801), so as to supply air to the diffuser air inlet (801).

11. The gas suspension motor according to claim 9, characterized in that: Further comprising a second radial bearing seat (5), a second radial bearing (7) and a second diffuser (9), the second radial bearing seat (5) is located at the outer periphery of the partial shaft section of the rotor (3), the second radial bearing (7) is arranged between the outer periphery of the rotor (3) and the inner periphery of the second radial bearing seat (5) to radially support the rotor (3), the second radial bearing seat (5) is arranged axially spaced from the first radial bearing seat (4), the radially outer portion of the second diffuser (9) is axially connected with the second radial bearing seat (5), the radially inner portion of the second diffuser (9) is axially spaced from the second radial bearing seat (5) to form a through space, the inside of the second radial bearing seat (5) has a second gas guide through hole (23), one end of the second gas guide through hole (23) is communicated with the cooling gas flow channel (21), the other end of the second gas guide through hole (23) is communicated with the through space, the through space is communicated with the second radial bearing (7) to cool and provide gas for supporting the second radial bearing (7).

12. The gas suspension motor according to claim 11, characterized in that: The gas after passing through the first radial bearing (6) enters the inside of the casing (1) to cool the stator (2), the gas after passing through the second radial bearing (7) enters the inside of the casing (1) to cool the stator (2) and the rotor (3), and the gas after passing through the first radial bearing (6) enters the inside of the casing (1) can be mixed with the gas after passing through the second radial bearing (7) and entering the inside of the casing (1); The casing (1) is further provided with a motor gas outlet (24), one end of the motor gas outlet (24) is communicated with the inside of the casing (1), and the other end is communicated to the outside of the casing (1) to guide the gas in the inside of the casing (1) out.

13. A compressor characterized by: The gas suspension motor according to any one of claims 9-12.

14. The compressor according to claim 13, characterized in that: Further comprising a first-stage impeller (14), a first-stage volute (16), a second-stage impeller (15) and a second-stage volute (17), the first-stage impeller (14) and the first diffuser (8) are arranged in the inside of the first-stage volute (16), the second-stage impeller (15) and the second diffuser (9) are arranged in the inside of the second-stage volute (17), the first diffuser (8) is a first-stage diffuser, the second diffuser (9) is a second-stage diffuser, part of the gas compressed by the first-stage impeller (14) and expanded by the first-stage diffuser enters the second-stage volute (17) for second-stage compression, and part of the gas is guided to the cooling gas flow channel (21) through the compressed gas outlet (19) on the connecting pipe (18), the casing (1) is further provided with a motor gas inlet (20), the compressed gas outlet (19) is communicated with the motor gas inlet (20), and the motor gas inlet (20) is communicated with the cooling gas flow channel (21).

Images