Gas compressor

Abstract

The invention relates to the technical field of gas compressors, in particular to a gas compressor which comprises a shell internally provided with a containing cavity, and the shell is provided with a gas inlet and a gas outlet; the first air bearing and the second air bearing are both fixedly arranged in the shell and divide the containing cavity into a first cavity, a second cavity and a third cavity which communicate with one another in the first direction, the air inlet communicates with the first cavity, and the air outlet communicates with the third cavity; the driving assembly comprises a rotating shaft, a first stator, a first rotor and an impeller, the stator is fixedly arranged in the second cavity, the rotating shaft is rotationally connected to the first air bearing and the second air bearing, the first rotor is fixedly arranged on the part, located in the second cavity, of the rotating shaft, and the impeller is fixedly arranged on the part, located in the third cavity, of the rotating shaft; solid friction caused by mechanical contact is avoided, a large amount of heat generated by friction is reduced, power loss is reduced, the efficiency of the whole machine is improved, operation stability is guaranteed, and the limitation of the limit rotating speed of the rotor and the service life of equipment is broken through.

Description

TECHNICAL FIELD

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

[0002] In the prior art, the compressor as a core fluid power component, its performance is highly dependent on the operating speed of the rotor. In order to achieve higher exhaust pressure and flow, continuously improving the speed has become a key technology path. The existing patent document CN222254392U discloses a cooling air path structure of a forced air cooling compressor, which adopts a traditional bearing structure. The solid friction caused by mechanical contact will increase sharply with the increase of the speed, which not only produces a large amount of friction heat, resulting in a significant bearing temperature rise, and requires a complex cooling system, but also causes serious power loss, resulting in a decrease in the efficiency of the whole machine. In addition, the continuous mechanical wear not only changes the dynamic clearance of the bearing, affecting the operation stability, but also fundamentally limits the limit speed of the rotor and the service life of the equipment. Furthermore, the contact vibration and noise under high speed are particularly prominent, which affects the reliability and user experience of the product. Therefore, the inherent defects of ordinary mechanical bearings in friction, wear, heating and efficiency have become the main obstacles to the development of the compressor to higher speed, longer service life and better efficiency. SUMMARY

[0003] The purpose of the present application is to provide a compressor to solve the problem of efficiency and service life reduction of the traditional mechanical bearing in the compressor in the prior art.

[0004] The technical solution of the present application is: a compressor, comprising: a housing, which is provided with a containing cavity, the housing is provided with an air inlet and an air outlet; a first gas bearing and a second gas bearing, both of which are fixedly arranged in the interior of the housing and divide the containing cavity into a first chamber, a second chamber and a third chamber which are interconnected along a first direction, the air inlet is connected to the first chamber, and the air outlet is connected to the third chamber; a driving assembly, comprising a rotating shaft, a first stator, a first rotor and an impeller, the first stator is fixedly arranged in the second chamber, the rotating shaft is rotatably connected to the first gas bearing and the second gas bearing, the first rotor is fixedly arranged on the part of the rotating shaft located in the second chamber, and the impeller is fixedly arranged on the part of the rotating shaft located in the third chamber, for generating negative pressure in the third chamber, so that the airflow enters from the air inlet, is compressed in the containing cavity and is output from the air outlet.

[0005] Preferably, a heat dissipation cover is fixed inside the shell, and the heat dissipation cover is provided with a plurality of heat dissipation channels communicating with the first chamber and the third chamber, and the airflow at the air inlet is divided into at least two streams in the first chamber, one of which enters the third chamber through the first chamber and the second chamber, and the other of which enters the third chamber through the heat dissipation channels.

[0006] Preferably, the first air floating bearing comprises a first bearing part extending in a first direction, and the rotating shaft is suspended and rotated in the first bearing part when the airflow passes through the first bearing part, and the first bearing part is fixed to the heat dissipation cover through a first connecting part, the first connecting part is in sealed connection with the heat dissipation cover, the first connecting part is provided with a first heat dissipation hole communicating with the heat dissipation channels, and a gas guide hole communicating with the first chamber and the second chamber.

[0007] Preferably, the second air floating bearing comprises a second bearing part and a second connecting part, the central axis of the first bearing part is coaxial with the central axis of the second bearing part, and the rotating shaft is suspended and rotated in the second bearing part when the airflow passes through the second bearing part, and the second bearing part is fixed to the heat dissipation cover through the second connecting part, the second connecting part is in sealed connection with the heat dissipation cover, and the second connecting part is provided with a second heat dissipation hole communicating with the heat dissipation channels.

[0008] Preferably, the second connecting part is fixed with a support towards the side of the third chamber, the rotating shaft is movably arranged in the support, and a gap for the airflow to pass through is formed between the rotating shaft and the inner wall of the support, a fourth chamber is formed between the support and the second air floating bearing, and a thrust piece is arranged in the fourth chamber, the thrust piece is fixed to the outer circumferential side of the rotating shaft and is limited between the second connecting part and the support.

[0009] Preferably, the fourth chamber is further provided with two third air floating bearings, the two third air floating bearings are arranged on both sides of the thrust piece along the axial direction and are respectively fixed to the inner wall of the second connecting part and the support, and an air film is formed between the third air floating bearings and the thrust piece.

[0010] Preferably, the third air floating bearing comprises: A bearing table is configured in a circular ring structure, and the side thereof is fixed to the second connecting part or the support; A plurality of bearing strips are fixed to the side of the bearing table facing the thrust piece in a circular array and extend in the radial direction of the bearing table; A plurality of gas guide plates are fixed to the corresponding bearing strips in a fan ring shape, and a gap is formed between the gas guide plates and the bearing table.

[0011] Preferably, the inner arc edge of the air guide plate overlaps with the inner wall of the bearing table, and the air guide plate and the bearing table have an inclination angle, so that a wedge-shaped gap is formed between the surface of the air guide plate and the disc surface of the thrust piece.

[0012] Preferably, the first air floating bearing is provided with a rotary transformer, the rotary transformer comprising a second stator and a second rotor, the second stator being fixed to the side of the first air floating bearing facing the first chamber, and the second rotor being fixed to the part of the rotating shaft located in the first chamber.

[0013] Compared with the prior art, the advantages of the present application are: The first air floating bearing and the second air floating bearing are used to divide the accommodating cavity into the first, second and third chambers which are in communication with each other inside the shell, and the rotating shaft of the driving assembly is connected to the two air floating bearings, so that the stator, the rotor and the impeller are located in the corresponding chambers respectively. The air floating bearing replaces the traditional mechanical bearing, avoids solid friction caused by mechanical contact, and thereby significantly reduces the accumulation of friction heat caused by high-speed rotation, effectively controls energy loss, and improves the energy efficiency level of the whole machine. At the same time, the continuous mechanical wear is eliminated, the dynamic clearance of the bearing is not changed, the operation stability is ensured, and the limit of the rotor speed and the service life of the equipment is broken. In addition, the contact vibration and noise at high speed are avoided, the reliability and user experience of the product are improved, and the main obstacles of ordinary mechanical bearings in friction, wear, heating and efficiency, etc. are effectively solved, which restrict the development of air compressors in the direction of higher speed, longer service life and better efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in conjunction with the drawings and examples: Figure 1 A structure schematic diagram of an air compressor according to the present application; Figure 2 An axial sectional structure schematic diagram of an air compressor according to the present application; Figure 3 A radial sectional structure schematic diagram of an air compressor according to the present application; Figure 4 A structure schematic diagram of a first air floating bearing and a second air floating bearing according to the present application; Figure 5 A structure schematic diagram of a third air floating bearing according to the present application; Figure 6 An exploded structure schematic diagram of a third air floating bearing according to the present application; Figure 7 A structure schematic diagram of a second air floating bearing and a support according to the present application; Figure 8 An air path schematic diagram of an air compressor according to the present application.

[0015] BRIEF DESCRIPTION OF DRAWINGS 1, housing; 11, accommodating cavity; 111, first chamber; 112, second chamber; 113, third chamber; 12, air inlet; 13, air outlet; 14, heat dissipation cover; 141, heat dissipation channel; 2, first air floating bearing; 21, first bearing part; 22, first connecting part; 23, first heat dissipation hole; 24, air guide hole; 3, second air floating bearing; 31, second bearing part; 32, second connecting part; 33, second heat dissipation hole; 4, driving assembly; 41, rotating shaft; 42, first stator; 43, first rotor; 44, impeller; 5, rotary transformer; 51, second stator; 52, second rotor; 6, support; 61, fourth chamber; 7, thrust piece; 8, third air floating bearing; 81, bearing table; 82, bearing strip; 83, air guide plate. DETAILED DESCRIPTION

[0016] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in connection with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0018] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0019] As Figures 1 to 4As shown, a compressor comprises a housing 1, a first air floating bearing 2 and a second air floating bearing 3, the housing 1 is provided with a containing cavity 11, the first air floating bearing 2 and the second air floating bearing 3 are fixedly arranged in the interior of the housing 1 and jointly divide the containing cavity 11 into three spaces in communication with each other, which are a first chamber 111, a second chamber 112 and a third chamber 113 in sequence along a first direction. The housing 1 is provided with an air inlet 12 and an air outlet 13, the air inlet 12 is in communication with the first chamber 111, the air outlet 13 is in communication with the third chamber 113, and the housing 1 is provided with a driving assembly 4 for generating negative pressure in the third chamber 113 so that air flows from the air inlet 12 and is compressed in the process of passing through the containing cavity 11.

[0020] The driving assembly 4 comprises a rotating shaft 41, a first stator 42, a first rotor 43 and an impeller 44, the first stator 42 is fixedly arranged in the second chamber 112, the rotating shaft 41 is rotatably connected to the first air floating bearing 2 and the second air floating bearing 3, the first rotor 43 is fixedly arranged on the part of the rotating shaft 41 located in the second chamber 112, and the impeller 44 is fixedly arranged on the part of the rotating shaft 41 located in the third chamber 113. In this embodiment, the driving assembly 4 is a reluctance motor, which can maintain high efficiency in a wide range of rotating speed and power, similar to common synchronous or asynchronous motors, and is usually provided with two-phase or single-phase capacitor split-phase winding; the first rotor 43 is a double salient pole silicon steel sheet stacking structure without winding or permanent magnet, which has single-phase or multi-phase excitation mode.

[0021] The housing 1 extends along the first direction, preferably, the part of the housing 1 where the first chamber 111 is located is a thin-walled part, the inner diameter of this part gradually increases, the part of the housing 1 where the second chamber 112 is located is a column extending along the first direction, the housing 1 is fixedly provided with a heat dissipation cover 14, the outer wall of the heat dissipation cover 14 is integrally formed with the inner wall of the housing 1, and one end of the heat dissipation cover 14 forms a stepped structure with the part of the housing 1 where the first chamber 111 is located. The heat dissipation cover 14 is provided with a plurality of heat dissipation channels 141 in communication with the first chamber 111 and the second chamber 112, preferably, the plurality of heat dissipation channels 141 are distributed in the circumferential direction of the central axis of the heat dissipation cover 14. The air flow at the air inlet 12 is at least divided into two streams in the first chamber 111, one of which enters the second chamber 112 from the first chamber 111 and then enters the third chamber 113; the other stream of air flow flows through the heat dissipation channels 141 from the first chamber 111 and then enters the third chamber 113. The part of the air flow that is divided flows through the heat dissipation channels 141, which can specifically cool the driving assembly 4 in the second chamber 112 and the heat dissipation cover 14, significantly increase the heat dissipation area and strengthen heat exchange, thereby effectively controlling the temperature of the driving assembly 4 in the process of compressing air and improving the working stability and service life of the equipment.

[0022] The first air floating bearing 2 comprises a first bearing part 21 and a first connecting part 22, the first bearing part 21 extends along the first direction and is configured as a hollow cylindrical structure.

[0023] The first connecting part 22 is configured as a disc structure, the inner wall of the first connecting part 22 is fixed to the outer wall of the first bearing part 21, and the outer wall of the first connecting part 22 abuts against the inner wall of the shell 1. The side surface of the first connecting part 22 is sealingly and fixedly connected with the heat dissipation cover 14, and in this embodiment, the first connecting part 22 is bolted with the end surface of the heat dissipation cover 14. Preferably, the first connecting part 22 is provided with a first sealing ring, the outer wall of the first sealing ring is sealingly connected with the inner wall of the heat dissipation cover 14 close to the inlet thereof, so as to avoid the leakage of the airflow of the first chamber 111 into the second chamber 112 at the inlet of the heat dissipation channel 141. The first connecting part 22 is provided with first heat dissipation holes 23 in communication with the heat dissipation channel 141, and the first heat dissipation holes 23 correspond to the heat dissipation channel 141 one by one. The first connecting part 22 not only improves the controllability and consistency of the heat dissipation efficiency, but also avoids the decrease of the cooling performance caused by the short circuit of the leakage airflow, and the disc structure itself enhances the overall structural stability.

[0024] The gap between the first air floating bearing 2 and the rotating shaft 41 forms an air film, which hinders the airflow from flowing through the gap, and the first connecting part 22 is provided with a gas guide hole 24 in communication with the first chamber 111 and the second chamber 112. Since the normal operation of the air floating bearing depends on the thin and stable air film formed between the air floating bearing and the rotating shaft 41, if the airflow cannot smoothly flow through the air floating bearing area, it will cause the pressure on the first chamber 111 side to be too high and the pressure on the second chamber 112 side to be too low, and this pressure difference imbalance will destroy the uniformity and stiffness of the air film. The gas guide hole 24 directly balances the pressure on both sides of the bearing by shunting a part of the airflow, thereby providing a stable pressure environment for the air film.

[0025] The side of the first air floating bearing 2 facing the first chamber 111 is provided with a rotary transformer 5 for detecting the position and speed of the rotating shaft 41, the rotary transformer 5 includes a second stator 51 and a second rotor 52, the second stator 51 is fixed to the side of the first air floating bearing 2 facing the first chamber 111, and the second rotor 52 is fixed to the part of the rotating shaft 41 located in the first chamber 111. A high-frequency alternating excitation signal is input to the second stator 51 fixed to the side of the first air floating bearing 2, the signal is transmitted to the second rotor 52 fixed to the rotating shaft 41 through electromagnetic coupling; when the rotating shaft 41 rotates, the angle change of the second rotor 52 relative to the second stator 51 will modulate the coupled-out signal, thereby generating induced voltages in the two orthogonal output windings of the second stator 51, the amplitudes of which are related to the sine and cosine angles of the rotor respectively, these signals are sent to an external decoding chip for processing, and finally the accurate angular position and speed of the rotating shaft 41 are analyzed in real time.

[0026] The second air floating bearing 3 comprises a second bearing part 31 and a second connecting part 32, the second bearing part 31 extends along the first direction, and the central axis of the first bearing part 21 is coaxial with the center line of the second bearing part 31, and the rotating shaft 41 is rotationally connected to the first bearing part 21 and the second bearing part 31. When the rotating shaft 41 moves relative to the bearing, fluid dynamic pressure is generated in the gap. Without external air source, due to the air viscosity, air is brought into the contraction gap when rotating at high speed, the pressure is increased to form air film bearing capacity, the rotating shaft 41 is separated from the bearing, the friction heat is reduced, the transmission efficiency is improved, and the rotating speed can reach 1.3 million revolutions per minute.

[0027] The inner wall of the second connecting part 32 is fixed to the outer wall of the second bearing part 31, the second connecting part 32 is configured as a disc structure, the outer wall of the second connecting part 32 abuts against the inner wall of the shell 1, and the side surface of the second connecting part 32 is sealingly and fixedly connected with the heat dissipation cover 14. In this embodiment, the second connecting part 32 is bolted to the end surface of the heat dissipation cover 14. Preferably, the outlet side of the second connecting part 32 towards the heat dissipation cover 14 is provided with a second sealing ring, and the outer wall of the second sealing ring is sealingly connected with the inner wall of the heat dissipation cover 14 near the outlet thereof, so as to avoid the air flow of the second chamber 112 from leaking into the third chamber 113 at the outlet of the heat dissipation channel 141. The second connecting part 32 is provided with second heat dissipation holes 33 in communication with the heat dissipation channel 141, and each of the second heat dissipation holes 33 corresponds to the heat dissipation channel 141. The second connecting part 32 ensures that the air flow flows in the heat dissipation channel 141 according to the predetermined path, improves the heat dissipation efficiency, and avoids the air flow in different chambers from interfering with each other, thereby ensuring the stability and independence of the work of each part inside the shell 1.

[0028] As shown in FIG. 1, Figures 5 to 7 The side surface of the second connecting part 32 towards the third chamber 113 is fixedly provided with a support 6, the rotating shaft 41 is movably arranged in the support 6, and a gap for air flow is formed between the rotating shaft 41 and the inner wall of the support 6. The support 6 and the second air floating bearing 3 form a fourth chamber 61 in the shape of a ring, and the air flow of the second air floating bearing 3 passes through the fourth chamber 61 and then enters the third chamber 113.

[0029] The fourth chamber 61 is provided with a thrust piece 7 and two third air floating bearings 8. The thrust piece 7 is configured as a disc structure, the inner wall of the thrust piece 7 is fixed to the outer circumferential side of the rotating shaft 41, and the thrust piece 7 is limited by the second air floating bearing 3 and the support 6 to limit the axial movement of the rotating shaft 41. The two groups of third air floating bearings 8 are arranged on the two sides of the thrust piece 7 along the axial direction, one of the third air floating bearings 8 is fixed to the inner wall of the second connecting part 32, and the other third air floating bearing 8 is fixed to the inner wall of the support 6. The two third air floating bearings 8 and the thrust piece 7 form air films, that is, the thrust piece 7 is in a suspended state when the air flow passes through. In this embodiment, the air flow directions on both sides of the thrust piece 7 are parallel, and the air flow directions on both sides of the thrust piece 7 are perpendicular to the air flow direction in the second air floating bearing 3.

[0030] Specifically, the third gas-float bearing 8 comprises a bearing platform 81, a plurality of bearing strips 82, a plurality of gas-guiding plates 83, The bearing platform 81 is configured as a circular ring, the inner wall of the bearing platform 81 forms a gap with the rotating shaft 41, and the side surface of the bearing platform 81 is fixed to the second connecting portion 32.

[0031] The plurality of bearing strips 82 are circumferentially arranged and fixed to the side surface of the bearing platform 81 away from the second connecting portion 32, and each of the plurality of bearing strips 82 extends along the radial direction of the bearing platform 81. The gas-guiding plate 83 is configured as a fan ring and is fixed to the bearing strip 82, so that a gap is formed between the gas-guiding plate 83 and the bearing strip 82.

[0032] Preferably, the inner arc edge of the gas-guiding plate 83 overlaps the inner wall of the bearing platform 81, and the straight edge on one side of the gas-guiding plate 83 is flush with the bearing strip 82, so that the gas-guiding plate 83 forms a cantilever structure. More preferably, the gas-guiding plate 83 has a small inclination angle with the bearing platform 81, so that a wedge-shaped gap with a variable size is formed between the surface of the gas-guiding plate 83 and the disc surface of the thrust piece 7.

[0033] Each group of bearing strips 82 and gas-guiding plates 83 forms a local high-pressure area. The high pressure generated by all the circumferentially arranged bearing strip 82 / gas-guiding plate 83 units is combined to form a uniform, stable and high-rigidity gas film. During the rotation of the thrust piece 7, the thrust piece 7 is completely not in contact with the two third gas-float bearings 8 in the axial direction, and the two gas films formed by the two gas-float bearings and the thrust piece 7 are dynamically balanced to play the role of axial thrust of the transmission shaft.

[0034] In the embodiment, the part of the shell 1 constituting the third chamber 113 is the turbine shell 1 structure, so as to reduce gas turbulence, reduce energy loss, reduce resistance loss, and improve the gas energy conversion rate.

[0035] Principle of implementation: As Figure 8As shown, the stator and the rotor are connected through electromagnetic effect, so that the rotor drives the rotating shaft 41 to rotate, and the rotating shaft 41 drives the impeller 44 in the third chamber 113 to rotate, so that the third chamber 113 generates negative pressure and forces the air inlet 12 to intake air. After the airflow enters the first chamber 111, it is divided into three airflows, wherein the first airflow flows into the heat dissipation channel 141, and then flows into the third chamber 113 after dissipating heat of the heat dissipation cover 14 and the driving assembly 4; the second airflow flows from the first chamber 111 into the second chamber 112 through the air guide hole 24 of the first air floating bearing 2, and part of the airflow of the second chamber 112 enters the third chamber 113 through the air guide hole 24 of the second air floating bearing 3, so as to balance the air pressure between the first chamber 111, the second chamber 112 and the third chamber 113; the third airflow enters the second chamber 112 through the gap between the first air floating bearing 2 and the rotating shaft 41, and makes the rotating shaft 41 suspended and rotate relative to the first air floating bearing 2, and part of the airflow of the second chamber 112 enters the gap between the second air floating bearing 3 and the rotating shaft 41, and then enters the third chamber 113 through the gaps between the two third air floating bearings 8 and the thrust piece 7, on the one hand, making the rotating shaft 41 suspended and rotate relative to the second air floating bearing 3, and on the other hand, limiting the movement of the rotating shaft 41 in the axial direction, so as to ensure that the rotating shaft 41 can stably and efficiently rotate.

[0036] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application, therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A compressor characterized by, The utility model relates to a kind of air compressor, including: Shell (1), is equipped with containing cavity (11) inside, the shell (1) is equipped with air inlet (12) and air outlet (13); First gas bearing (2) and second gas bearing (3), are all fixed in the inside of the shell (1) and the containing cavity (11) is separated into first chamber (111), second chamber (112) and third chamber (113) along first direction by intercommunication, the air inlet (12) is communicated first chamber (111), the air outlet (13) is communicated third chamber (113); Driving assembly (4), including rotating shaft (41), first stator (42), first rotor (43) and impeller (44), the first stator (42) is fixed in second chamber (112), the rotating shaft (41) is rotatably connected to the first gas bearing (2) and the second gas bearing (3), the first rotor (43) is fixed on the rotating shaft (41) part in second chamber (112), the impeller (44) is fixed on the rotating shaft (41) part in third chamber (113), for generating negative pressure in third chamber (113), so that air flow enters from air inlet (12), is compressed from air outlet (13) after being output in containing cavity (11).

2. A compressor as claimed in claim 1, wherein: The shell (1) is fixed with heat dissipation cover (14) inside, the heat dissipation cover (14) is equipped with a plurality of heat dissipation channels (141) communicated first chamber (111) and third chamber (113), air flow in air inlet (12) is at least divided into two streams in first chamber (111), one of which, another air flow enters third chamber (113) from first chamber (111) after flowing through heat dissipation channel (141) after another air flow enters third chamber (113) from first chamber (111) after flowing through heat dissipation channel (141).

3. A compressor as claimed in claim 2, wherein: The first gas bearing (2) includes first bearing part (21) and first connecting part (22), the first bearing part (21) extends along the first direction, when air flow passes through first bearing part (21), rotating shaft (41) is suspended and rotates in first bearing part (21), the first bearing part (21) is fixed on the heat dissipation cover (14) by first connecting part (22), the first connecting part (22) is sealedly connected with heat dissipation cover (14), the first connecting part (22) is equipped with first heat dissipation hole (23) communicated with the heat dissipation channel (141), and gas guide hole (24) communicated first chamber (111) and second chamber (112).

4. A compressor as claimed in claim 3, wherein: The second air floating bearing (3) comprises a second bearing part (31) and a second connecting part (32), the central axis of the first bearing part (21) is coaxial with the central axis of the second bearing part (31), the rotating shaft (41) is suspended and rotates in the second bearing part (31) when air flows through the second bearing part (31), the second bearing part (31) is fixed on the heat dissipation cover (14) through the second connecting part (32), the second connecting part (32) is in sealed connection with the heat dissipation cover (14), and the second connecting part (32) is provided with a second heat dissipation hole (33) in communication with the heat dissipation channel (141).

5. A compressor as claimed in claim 4, wherein: The second connecting part (32) is fixed with a support (6) on the side face of the third chamber (113), the rotating shaft (41) is movably arranged in the support (6), and a gap for air flow is formed between the rotating shaft (41) and the inner wall of the support (6), a fourth chamber (61) is formed between the support (6) and the second air floating bearing (3), and a thrust piece (7) is arranged in the fourth chamber (61), the thrust piece (7) is fixed on the outer circumferential side of the rotating shaft (41) and is limited between the second connecting part (32) and the support (6).

6. A compressor as claimed in claim 5, wherein: The fourth chamber (61) is also provided with two third air floating bearings (8), the two third air floating bearings (8) are arranged on the two sides of the thrust piece (7) in the axial direction and are respectively fixed on the inner wall of the second connecting part (32) and the support (6), and an air film is formed between the third air floating bearing (8) and the thrust piece (7).

7. A compressor as claimed in claim 6, characterised in that: The third air floating bearing (8) comprises: A bearing table (81) is configured in a circular ring structure, and the side face thereof is fixed to the second connecting part (32) or the support (6); A plurality of bearing strips (82) are fixed to the side face of the bearing table (81) facing the thrust piece (7) in a circumferential array and extend in the radial direction of the bearing table (81); A plurality of gas guide plates (83) are fixed to the corresponding bearing strips (82) in a fan ring shape, and a gap is formed between the gas guide plates (83) and the bearing table (81).

8. A compressor as claimed in claim 7, wherein: The inner arc edge of the gas guide plate (83) overlaps the inner wall of the bearing table (81), and the gas guide plate (83) and the bearing table (81) have an inclination angle, so that a wedge-shaped gap is formed between the surface of the gas guide plate (83) and the disc surface of the thrust piece (7).

9. A compressor as claimed in claim 2, wherein: The first air floating bearing (2) is provided with a rotary transformer (5), the rotary transformer (5) comprises a second stator (51) and a second rotor (52), the second stator (51) is fixed to the side face of the first air floating bearing (2) facing the first chamber (111), and the second rotor (52) is fixed to the part of the rotating shaft (41) located in the first chamber (111).

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