Magnetic suspension bearing, compressor and air compressor

Abstract

The invention relates to a magnetic suspension bearing, a compressor and an air compressor, and the magnetic suspension bearing comprises a support assembly which is used for being fixedly connected with a shell of the compressor; the bearing stator assembly is mounted on the support assembly; wherein the support assembly is provided with at least one liquid cooling flow channel, and at least part of the liquid cooling flow channel is arranged opposite to the bearing stator assembly in the axial direction of the magnetic suspension bearing. According to the magnetic suspension bearing disclosed by the invention, the cooling liquid in the liquid cooling flow channel circularly flows, so that the cooling liquid exchanges heat with the support assembly which generates heat, the heat is absorbed, and the temperature of the magnetic suspension bearing is reduced. And the cooling liquid absorbing heat flows out of the flow channel, is cooled by an external heat dissipation device and then flows into the flow channel again to form continuous cooling circulation, so that the temperature of the magnetic suspension bearing is effectively controlled, and the influence of local high temperature on the performance and the service life of the compressor is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of compressor equipment, and in particular to a magnetic suspension bearing, a compressor and an air compressor. Background Art

[0002] The rotor of the magnetic levitation air compressor runs at high speed in a suspended state. Under the high pressure ratio, the radial magnetic levitation bearing and the axial magnetic levitation bearing will generate a lot of heat, resulting in local high temperature, which will affect the performance and service life of the compressor. Summary of the Invention

[0003] The purpose of the present invention is to at least solve the problem of a large amount of heat generated during operation of a magnetic bearing, which leads to local high temperatures. This purpose is achieved by:

[0004] The first aspect of the present invention proposes a magnetic bearing for being mounted on the outside of the rotor of a compressor, the magnetic bearing comprising: a support assembly for being fixedly connected to the casing of the compressor; a bearing stator assembly mounted on the support assembly; wherein the support assembly is provided with at least one liquid cooling channel, at least part of the liquid cooling channel being arranged opposite to the bearing stator assembly along the axial direction of the magnetic bearing, and capable of exchanging heat with the bearing stator assembly.

[0005] The magnetic bearing according to the present invention circulates coolant within the liquid-cooling channel, exchanging heat with the heat-generating support assembly, absorbing the heat and reducing the temperature of the magnetic bearing. After absorbing the heat, the coolant flows out of the channel, is cooled by an external heat sink, and then flows back into the channel, forming a continuous cooling cycle. This effectively controls the temperature of the magnetic bearing and prevents localized high temperatures from affecting the performance and service life of the compressor.

[0006] In addition, the magnetic bearing according to the present invention may also have the following additional technical features:

[0007] In some embodiments of the present invention, the magnetic levitation bearing includes a radial magnetic bearing, which is used to provide radial support force to the rotor; the support assembly includes a radial support assembly, and the radial magnetic bearing has the radial support assembly; the bearing stator assembly includes a radial bearing stator, and the radial magnetic bearing has the radial bearing stator; the liquid cooling channel includes a radial bearing liquid cooling channel provided on the radial support assembly.

[0008] In some embodiments of the present invention, the radial magnetic bearing also includes a radial bearing magnetic pole plate, which is installed on the radial support assembly. An air-cooling cavity is defined between the radial support assembly and the magnetic pole plate, and the radial bearing stator is installed in the air-cooling cavity; the radial support assembly is provided with an air inlet and an air outlet communicating with the air-cooling cavity.

[0009] In some embodiments of the present invention, the radial support assembly includes: a radial bearing seat, which is annular in structure and connected to the radial bearing magnetic pole plate; a radial bearing end cover, which is fixedly mounted on the inner ring surface of the radial bearing seat and spaced apart from the radial bearing magnetic pole plate along the axial direction of the radial magnetic bearing; the radial bearing end cover, the radial bearing seat and the radial bearing magnetic pole plate enclose the air-cooling cavity; wherein the air inlet and the air outlet are arranged on the radial bearing seat, and the radial bearing liquid-cooling channel is arranged on the radial bearing end cover.

[0010] In some embodiments of the present invention, the radial support assembly also includes a first support member, which is installed on the inner annular surface of the radial bearing seat and is spaced apart from the radial bearing end cover along the axial direction of the radial magnetic bearing, and the radial bearing magnetic pole plate is installed on a side of the first support member facing away from the radial bearing end cover.

[0011] In some embodiments of the present invention, along the radial direction of the radial magnetic bearing, the air inlet and the air outlet respectively penetrate the inner circumferential surface of the radial bearing seat; and / or, the radial bearing seat is provided with a first liquid inlet and a first liquid outlet, and along the radial direction of the radial magnetic bearing, the first liquid inlet and the first liquid inlet respectively penetrate the inner circumferential surface of the radial bearing seat, the first liquid inlet is communicated with the liquid inlet end of the radial bearing liquid cooling channel, and the first liquid outlet is communicated with the liquid outlet end of the radial bearing liquid cooling channel.

[0012] In some embodiments of the present invention, the radial support assembly further includes an air duct shell, which is mounted on the circumferential outer wall of the radial bearing seat. The air duct shell is provided with an air inlet channel, which is communicated with the air inlet.

[0013] In some embodiments of the present invention, the angle between the shortest line segments from the outer end centers of the first liquid inlet and the outer end centers of the first liquid outlet to the axis of the radial bearing seat is a, and the value range of a is 4°<a≤20°.

[0014] In some embodiments of the present invention, the radial bearing end cover includes an end cover body and a radial support portion connected to the end cover body. The radial support portion and the end cover body jointly define an avoidance space, and the avoidance space is used to avoid the radial bearing stator. Along the axial direction of the radial magnetic bearing, the radial support portion is formed with a mounting portion, and the mounting portion is used to install a protective bearing.

[0015] In some embodiments of the present invention, the radial bearing liquid cooling channel includes a first liquid inlet channel, a first liquid outlet channel, and a radial bearing heat conduction channel, wherein the liquid inlet of the radial bearing heat conduction channel is communicated with the first liquid inlet channel, and the liquid outlet of the radial bearing heat conduction channel is communicated with the first liquid outlet channel;

[0016] Wherein, along the axial direction of the radial magnetic bearing, the radial bearing heat conduction channel and the radial bearing stator are arranged opposite to each other.

[0017] In some embodiments of the present invention, the radial bearing heat conduction channel includes a first heat conduction channel formed on the end cover body and a second heat conduction channel formed on the radial support portion, the first heat conduction channel includes a first heat conduction segment and a second heat conduction segment extending along the circumference of the radial magnetic bearing, the second heat conduction channel includes a third heat conduction segment and a fourth heat conduction segment extending along the circumference of the radial magnetic bearing, the first heat conduction segment communicates with the second heat conduction segment through the third heat conduction segment, and the third heat conduction segment communicates with the fourth heat conduction segment through the second heat conduction segment;

[0018] Wherein, along the circumference of the radial magnetic bearing, a first connecting support structure is provided between the first heat conducting segment and the second heat conducting segment, and a second connecting support structure is provided between the third heat conducting segment and the fourth heat conducting segment.

[0019] In some embodiments of the present invention, the magnetic levitation bearing includes an axial magnetic bearing, which is used to provide axial support force to the rotor shaft; the support assembly includes an axial bearing seat, the axial magnetic bearing has the axial bearing seat, the bearing stator assembly includes an axial bearing winding, and the axial magnetic bearing has the axial bearing winding; the liquid cooling channel includes an axial bearing liquid cooling channel formed in the axial bearing seat.

[0020] In some embodiments of the present invention, the axial magnetic bearing further includes: a first magnetic pole plate, installed on the axial bearing seat; a second magnetic pole plate, connected to the first magnetic pole plate and defining an installation cavity between the second magnetic pole plate and the first magnetic pole plate; wherein the axial bearing winding is installed in the installation cavity.

[0021] In some embodiments of the present invention, along the axial direction of the axial magnetic bearing, a side of the axial bearing seat facing the first magnetic pole plate is provided with an assembly groove, and at least a portion of the first magnetic pole plate is installed in the assembly groove.

[0022] In some embodiments of the present invention, the axial bearing liquid cooling channel includes a second liquid inlet channel, a second liquid outlet channel and an axial bearing heat conduction channel, the liquid inlet of the axial bearing heat conduction channel is communicated with the second liquid inlet channel, and the liquid outlet of the axial bearing heat conduction channel is communicated with the second liquid outlet channel; wherein, along the axial direction of the axial magnetic bearing, the axial bearing heat conduction channel is arranged opposite to the first magnetic pole plate.

[0023] In some embodiments of the present invention, the axial bearing heat-conducting channel includes a third heat-conducting channel and a fourth heat-conducting channel, the third heat-conducting channel surrounds the fourth heat-conducting channel and the two are connected, a portion of the wall of the third heat-conducting channel and a portion of the wall of the fourth heat-conducting channel form a step, the fourth heat-conducting channel is located on the side of the third heat-conducting channel away from the first magnetic pole plate along the axial direction of the axial magnetic bearing, and the third heat-conducting channel is respectively connected to the second liquid inlet channel and the second liquid outlet channel.

[0024] In some embodiments of the present invention, the fourth heat conduction channel includes: a first heat conduction zone, which extends along the circumference of the axial magnetic bearing and has an annular structure and is connected to the third heat conduction channel; a plurality of second heat conduction zones, which are connected to and connected to the inner ring edge of the first heat conduction zone, and the plurality of second heat conduction zones are arranged in sequence along the circumference of the axial magnetic bearing.

[0025] In some embodiments of the present invention, at least one third connecting support structure is further provided in the liquid-cooling channel of the axial bearing. Along the radial direction of the axial magnetic bearing, the third connecting support structure forms a protrusion in the liquid-cooling channel of the axial bearing and is provided with a connecting hole. The connecting hole is used for a connecting member to pass through to connect the first magnetic pole plate and the axial bearing seat.

[0026] The second aspect of the present invention further provides a compressor, comprising the magnetic bearing described in the first aspect.

[0027] The third aspect of the present invention further provides an air compressor, comprising the compressor described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components.

[0029] Figure 1 Schematic diagram of the structure of a radial magnetic bearing according to one embodiment of the present invention;

[0030] Figure 2Schematic diagram of a three-dimensional cross-sectional structure of a radial magnetic bearing according to one embodiment of the present invention;

[0031] Figure 3 A schematic structural diagram of a radial magnetic bearing from another perspective of an embodiment of the present invention;

[0032] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the AA part;

[0033] Figure 5 Schematic diagram of the structure of a radial bearing end cover according to one embodiment of the present invention;

[0034] Figure 6 Schematic diagram of the structure of a radial bearing seat according to one embodiment of the present invention;

[0035] Figure 7 Schematic diagram of a three-dimensional cross-sectional structure of an end cover body according to one embodiment of the present invention;

[0036] Figure 8 Schematic diagram of the cross-sectional structure of a radial support portion according to one embodiment of the present invention;

[0037] Figure 9 Schematic diagram of the structure of an axial magnetic bearing according to one embodiment of the present invention;

[0038] Figure 10 A schematic structural diagram of an axial magnetic bearing from another perspective of an embodiment of the present invention;

[0039] Figure 11 for Figure 10 Schematic diagram of the cross-sectional structure of the middle BB part;

[0040] Figure 12 A schematic structural diagram of an axial magnetic bearing from another perspective according to an embodiment of the present invention;

[0041] Figure 13 for Figure 12 Schematic diagram of the cross-sectional structure of the CC part;

[0042] Figure 14 for Figure 12 Schematic diagram of the cross-sectional structure of the middle DD part;

[0043] Figure 15 This is a schematic structural diagram of an axial bearing seat according to one embodiment of the present invention.

[0044] The reference numerals in the accompanying drawings represent the following:

[0045] 421. Radial magnetic bearing; 4211. Radial support assembly; 4212. Radial bearing seat; 4213. Radial bearing end cover; 42131. End cover body; 42132. Radial support portion; 42133. Avoidance space; 42134. Mounting portion; 421341. Shaft hole; 421342. Positioning step; 421343. Annular support body; 4219. Radial bearing stator;

[0046] 42135. First connecting support structure; 42136. Second connecting support structure; 421113. Connecting support column;

[0047] 4214, first support member; 42141, first step surface; 42142, positioning ring; 4215, air duct housing; 42151, air inlet channel; 42153, air duct connecting portion;

[0048] 4216, radial bearing magnetic pole plate; 4210, air cooling chamber; 42101, air inlet; 42102, air outlet; 4217, first liquid inlet; 4218, first liquid outlet;

[0049] 422, axial magnetic bearing; 4221, axial bearing seat; 422111, assembly groove; 4221111, annular groove; 422112, third connecting support structure; 42210, mounting cavity; 4225, thermal insulation film;

[0050] 4222, first magnetic pole plate; 4223, second magnetic pole plate; 4224, axial bearing winding;

[0051] 423, liquid-cooling channel; 4231, radial bearing liquid-cooling channel; 42311, first liquid inlet channel; 42312, first liquid outlet channel; 42313, radial bearing heat conduction channel; 423131, first heat conduction channel; 4231311, first heat conduction segment; 4231312, second heat conduction segment; 4231313, heat conduction region; 4231314, connecting region; 423132, second heat conduction channel; 4231321, third heat conduction segment; 4231322, fourth heat conduction segment;

[0052] 4232, axial bearing liquid cooling channel; 42321, second liquid inlet channel; 42322, second liquid outlet channel; 42323, axial bearing heat conduction channel; 423231, third heat conduction channel; 423232, fourth heat conduction channel; 4232321, first heat conduction zone; 4232322, second heat conduction zone. DETAILED DESCRIPTION

[0053] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0054] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0055] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0056] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections or indirect connections through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is rotated, an element described as "below" or "beneath" another element or feature would subsequently be oriented "above" or "above" the other element or feature. Thus, the example term "below" can encompass both above and below orientations.

[0058] According to an embodiment of the present invention, a magnetic bearing is provided. Figure 1 、 Figure 2 、 Figure 10 and Figure 11 As shown,

[0059] The magnetic bearing includes a support assembly and a bearing stator assembly. The support assembly is provided with at least one liquid-cooling channel 423. At least part of the liquid-cooling channel is arranged along the axial direction of the magnetic bearing relative to the bearing stator assembly, thereby achieving heat dissipation and cooling of the magnetic bearing. In detail, the magnetic bearing can be a radial magnetic bearing 421 or an axial magnetic bearing 422. If the magnetic bearing is a radial magnetic bearing 421, the support assembly includes a radial support assembly 4211 in the radial magnetic bearing 421, and the bearing stator assembly includes a radial bearing stator 4219 in the radial magnetic bearing 421. If the magnetic bearing is an axial magnetic bearing 422, the support assembly includes an axial bearing seat 4221 in the axial magnetic bearing 422, and the bearing stator assembly includes an axial bearing winding 4224 in the axial magnetic bearing 422.

[0060] In this embodiment, the magnetic bearing consists of two radial magnetic bearings 421 and one axial magnetic bearing 422. Specifically, the radial and axial magnetic bearings 421 and 422 work together within the magnetic bearing to support the compressor rotor. The radial magnetic bearings 421 primarily suspend and support the rotor in the radial direction, while the radial support assembly 4211 is directly or indirectly fixedly connected to the compressor casing. The axial magnetic bearing 422 is responsible for suspending and positioning the rotor in the axial direction. The axial bearing seat 4221 is also directly or indirectly fixedly connected to the compressor casing and located at one axial end of the rotor. Together with the radial magnetic bearings 421, they form a three-dimensional spatial constraint on the rotor. When the magnetic compressor is operating, the electromagnetic coils of the radial and axial magnetic bearings 421 and 422 are energized, generating a magnetic field. The magnetic field of the radial magnetic bearing 421 exerts a radial levitation force on the rotor, causing it to levitate radially over the center of the bearing, avoiding mechanical contact with the bearing. The magnetic field of the axial magnetic bearing 422 generates an axial levitation force, stabilizing the rotor in its set axial position and preventing axial movement.

[0061] At least one of the radial support assembly 4211 and the axial bearing seat 4221 is provided with a liquid cooling channel 423. The liquid cooling channel 423 is connected to an external cooling system to form a complete cooling cycle, ensuring that the coolant can circulate continuously and continuously remove the heat generated by the radial magnetic bearing 421 or the axial magnetic bearing 422 during operation. In detail, under a high pressure ratio, a large amount of heat is generated during operation of the radial magnetic bearing 421 and the axial magnetic bearing 422, resulting in local high temperature. The coolant circulates in the liquid cooling channel 423, so that the coolant exchanges heat with the axial bearing seat 4221 or the radial support assembly 4211 that generates heat, absorbs heat, and reduces the temperature of the radial magnetic bearing 421 or the axial magnetic bearing 422. After absorbing heat, the coolant flows out of the channel, is cooled by an external heat sink, and then flows into the channel again, forming a continuous cooling cycle, thereby effectively controlling the temperature of the magnetic bearing and avoiding the impact of local high temperature on the performance and service life of the compressor.

[0062] In some embodiments, as Figure 2 and Figure 11 As shown, the radial support assembly 4211 and the axial bearing seat 4221 are respectively provided with at least one liquid cooling channel 423, so that both the radial magnetic bearing 421 and the axial magnetic bearing 422 can achieve heat dissipation.

[0063] In some embodiments, please combine Figure 2 、 Figure 3 and Figure 4As shown, the radial magnetic bearing 421 also includes a radial bearing magnetic pole plate 4216 and a radial bearing stator 4219. The radial bearing magnetic pole plate 4216 is installed on the radial support assembly 4211. An air-cooling cavity 4210 is defined between the radial support assembly 4211 and the magnetic pole plate. The radial bearing stator 4219 is installed in the air-cooling cavity 4210. The radial support assembly 4211 is provided with an air inlet 42101 and an air outlet 42102 communicating with the air-cooling cavity 4210. The air inlet 42101 is used to communicate with the air outlet end of an external air flow driving device, so that the radial magnetic bearing 421 can accelerate the heat dissipation of the radial bearing stator 4219 and the radial support assembly 4211 arranged in the air-cooling cavity 4210 by introducing cooling air flow, and further improve the heat dissipation effect by combining multiple heat dissipation modes of air cooling and liquid cooling.

[0064] The external airflow driving device may use a centrifugal blower or other fan to directly drive the external airflow into the air cooling chamber 4210 through the air inlet 42101 , or may use an external refrigeration system to supply cold air to the air cooling chamber 4210 through the air inlet 42101 .

[0065] In this embodiment, along the radial direction of the radial magnetic bearing 421, the air inlet 42101 and the air outlet 42102 are respectively arranged at opposite ends of the air cooling chamber 4210, so that the cooling air flow enters the air cooling chamber 4210 from one end and flows out from the other end, thereby increasing the heat exchange time of the cooling air flow in the air cooling chamber 4210 and the radial bearing stator 4219, thereby improving the heat exchange efficiency.

[0066] Furthermore, radial support assembly 4211 includes a radial bearing seat 4212 and a radial bearing end cap 4213. Radial bearing seat 4212 can be integrally formed from metal materials through casting or machining processes. It has an annular structure and serves as a base frame. Its axial ends are connected to the compressor casing and radial bearing end cap 4213, respectively. Radial bearing end cap 4213 is fixedly mounted to the inner annular surface of radial bearing seat 4212. Radial bearing end cap 4213, radial bearing seat 4212, and radial bearing pole plate 4216 are spaced apart along the axial direction of radial magnetic bearing 421. The air-cooling chamber 4210 is enclosed by radial bearing end cap 4213, radial bearing seat 4212, and radial bearing pole plate 4216.

[0067] In detail, the radial support assembly 4211 also includes a first support member 4214 and a second support member (not shown in the figure). The inner ring of the radial bearing seat 4212 is machined with an axial positioning groove, and the axial positioning groove is used to install the radial bearing end cover 4213. The radial bearing end cover 4213 is fixedly connected to the radial bearing seat 4212 through the second support member. The second support member is an annular structure. The second support member is embedded in the radial bearing seat 4212 and installed in the axial positioning groove. The circumferential outer surface of the second support member is connected to the inner ring surface of the radial bearing seat 4212. The radial bearing end cover 4213 is embedded in the second support member, and the circumferential outer surface of the radial bearing end cover 4213 is connected to the inner ring surface of the second support member.

[0068] The air inlet 42101 and air outlet 42102 are located on the radial bearing seat 4212, and the liquid-cooling channel 423 includes a radial bearing liquid-cooling channel 4231 located on the radial bearing end cap 4213. During operation of the radial magnetic bearing 421, an external airflow drive device delivers cooling air from the air inlet 42101 into the air-cooling chamber 4210. Within the air-cooling chamber 4210, the airflow exchanges heat with the inner surface of the radial bearing magnetic pole plate 4216, the radial bearing stator 4219, and the inner surface of the radial bearing end cap 4213, removing heat from the components within the air-cooling chamber 4210. The heated airflow is then discharged through the air outlet 42102. Simultaneously, the coolant exchanges heat with the radial bearing end cap 4213 in the radial bearing liquid-cooling channel 4231, removing heat accumulated in the end cap due to heat conduction. It then absorbs heat from the radial bearing seat 4212 before flowing out, forming a closed-loop cooling system.

[0069] The first support member 4214 is mounted on the inner annular surface of the radial bearing seat 4212. The radial bearing end cover 4213 and the first support member 4214 are respectively located at the two axial ends of the air-cooling chamber 4210. That is, the radial bearing end cover 4213 and the first support member 4214 are spaced apart along the axial direction of the radial magnetic bearing 421. The radial bearing magnetic pole plate 4216 is mounted on the first support member 4214, thereby indirectly fixedly connected to the radial bearing seat 4212. The radial bearing magnetic pole plate 4216 is mounted on the end surface of the first support member 4214 in the axial direction, facing away from the radial bearing end cover 4213. Specifically, the end face of the first support member 4214 axially away from the radial bearing end cover 4213 is configured as a step-like structure, including a first step surface 42141 and a positioning ring 42142 protruding from the first step surface 42141. The radial bearing pole plate 4216 is provided with a positioning groove that cooperates with the positioning ring 42142. When the radial bearing pole plate 4216 is installed on the first support member 4214, the positioning ring 42142 is inserted into the positioning groove. The positioning ring 42142 is connected to the positioning groove by an interference fit or a transition fit. The axial and radial positions of the radial bearing pole plate 4216 can be precisely controlled by mechanical limiting during assembly to avoid pole plate displacement due to installation errors. The end face of the radial bearing pole plate 4216 facing the radial bearing end cover 4213 is fitted with the first step surface 42141. The first step surface 42141 provides a rigid support plane. The radial bearing pole plate 4216 transmits the axial force to the first support member 4214 through the end face fitting, and then transmits it to the compressor casing through the radial support assembly 4211. The annular limit of the positioning ring 42142 can resist radial force and torque, and prevent the radial bearing pole plate 4216 from circumferential displacement during high-speed operation. In this embodiment, the insertion-type cooperation between the positioning ring 42142 and the positioning groove has a guiding function. No additional measurement and alignment is required during assembly. Positioning can be automatically completed through mechanical limit, reducing the technical requirements for assembly workers.

[0070] In some embodiments, please combine Figure 2 、 Figure 3 、 Figure 4 and Figure 6As shown, the air inlet 42101 and the air outlet 42102 respectively penetrate the radial bearing seat 4212 along the radial direction of the radial magnetic bearing 421. In addition, the air inlet 42101 and the air outlet 42102 are located at opposite ends of the radial bearing seat 4212 along the radial direction of the radial magnetic bearing 421. The air inlet 42101 and the air vents at the radial ends allow the cold air flow to enter the air cooling chamber 4210 radially from one side, pass through the radial bearing stator 4219 and the surface of the radial support assembly 4211 along the shortest path, and then flow out radially from the other side. When the air flow flows through the radial bearing stator 4219 and the support assembly in the air cooling chamber 4210, it directly contacts the heat source (such as the stator winding and the radial bearing magnetic pole plate 4216). Forced convection heat transfer reduces the temperature of the components and avoids local high temperature accumulation. Compared with axial or other directional airflow, the radial penetration path is more direct, reducing airflow loss and accelerating heat removal. It should also be noted that the radial air inlet and outlet design avoids opening air outlets in the axial direction, saving axial space, which is conducive to shortening the axial size of the radial magnetic bearing 421 and reducing the space occupied by the radial magnetic bearing 421 in the axial direction. It is more suitable for the compact structure of the coaxial high-speed rotation of the magnetic levitation bearing and the compressor rotor, thereby improving the integration of the entire machine.

[0071] Furthermore, the radially arranged air inlet 42101 is conveniently positioned to connect to an external fan, blower, or other airflow-driven device, thereby forming an independent air-cooling circulation system. For example, external cold air can be directly introduced into the air inlet 42101 via a pipe, eliminating the need for a complex axial piping layout and simplifying the system design.

[0072] In some embodiments, please combine Figure 2 、 Figure 3 and Figure 4As shown, the radial bearing seat 4212 is provided with a first liquid inlet 4217 and a first liquid outlet 4218. Along the radial direction of the radial bearing seat 4212, the first liquid inlet 4217 and the first liquid outlet 4218 are located on the same side of the radial bearing seat 4212 as the air inlet 42101, and the first liquid inlet 4217 and the first liquid outlet 4218 respectively pass through the radial bearing seat 4212 along the radial direction of the radial magnetic bearing 421. The first liquid inlet 4217 and the first liquid outlet 4218 are respectively connected to the cooling pipeline of the external cooling system, the first liquid inlet 4217 is communicated with the liquid inlet end of the radial bearing liquid cooling channel 4231, and the first liquid outlet 4218 is communicated with the liquid outlet end of the radial bearing liquid cooling channel 4231. In this embodiment, first liquid inlet 4217, first liquid outlet 4218, and air inlet 42101 are located on the same side of radial bearing seat 4212, allowing external piping (such as coolant pipes and fan ducts) of the liquid cooling system and air cooling system to be centrally connected on the same side, avoiding the need for intersecting piping around the circumference of the bearing seat, reducing installation complexity and space usage. First liquid inlet 4217 and first liquid outlet 4218 extend radially through the bearing seat, avoiding axial orientation. This allows for more space in the axial direction for components such as the axial magnetic bearing 422 and the rotor, facilitating the compact design of high-speed rotating machinery.

[0073] In some embodiments, please combine Figure 2 、 Figure 3 and Figure 4 As shown, radial support assembly 4211 further includes an air duct housing 4215, which defines an air inlet channel 42151 therein, which communicates with air inlet 42101. Air duct housing 4215 includes an air duct body (not shown) and an air duct connection portion 42153. The air duct body is an arc-shaped cylindrical structure, with a hollow interior forming a first air duct for air flow. The air duct body is mounted on the circumferential outer wall of radial bearing seat 4212 and is sealed therewith. The first air duct within the air duct body communicates with air inlet 42101. The air duct connection portion 42153 is connected to the air duct main body. The air duct connection portion 42153 is configured as a straight cylindrical structure extending radially along the radial bearing seat 4212. The interior of the air duct connection portion 42153 defines a second air duct, which is connected to the first air duct. The air inlet channel 42151 includes the first air duct and the second air duct. Specifically, the air duct shell 4215 can be an integral component made by a casting process or a sheet metal stamping process, or formed by the air duct main body and the air duct connection portion 42153 connected by welding or bolting. The air duct main body is installed in contact with the circumferential outer wall of the radial bearing seat 4212, and the contact surface is sealed with sealant to ensure that the airflow does not leak out. At the same time, the air duct main body and the radial bearing seat 4212 are fixedly connected by welding, bonding or bolting.

[0074] In this embodiment, please combine Figure 2 、 Figure 3 、 Figure 4 and Figure 6 As shown, the radial bearing seat 4212 may be provided with one or more air inlets 42101. When there is only one air inlet 42101, the length of the air inlet 42101 extends along the circumferential direction of the radial bearing seat 4212. When there are multiple air inlets 42101, the multiple air inlets 42101 are sequentially spaced along the circumferential direction of the radial bearing seat 4212. The arc shape of the air duct body matches the circumferential contour of the bearing seat. The internal first air duct is an annular channel that can evenly guide the external airflow to the multiple air inlets 42101. For example, after entering the first air duct, the airflow diffuses along the circumference of the arc cylinder, avoiding local high pressure caused by direct connection and reducing the deviation of the air intake volume of each air inlet 42101.

[0075] The straight-tube structure of the air duct connection part 42153 facilitates connection to the external pipeline of the air cooling system using flanges or quick-connect connectors. For example, when connecting with flanges, the bolt holes are evenly distributed around the circumference, and the sealing gasket can be used to achieve quick disassembly and assembly. The quick-connect connector supports replacement under pressure, which is conducive to rapid disassembly and assembly and convenient for later maintenance.

[0076] In some embodiments, as Figure 7 As shown, the value range of the central angle a between the first liquid inlet 4217 and the first liquid outlet 4218 and the axis of the radial bearing seat 4212 is 4°<a≤20°. For example, a can be set to 5°, 8°, 10°, 12°, 15°, 16°, 18°, 20°, etc. With this arrangement, the first liquid inlet 4217 and the first liquid outlet 4218 can be set on the same side of the radial bearing seat 4212 in the radial direction, thereby facilitating the connection or disassembly of the cooling pipeline of the external cooling system. In addition, the liquid inlet end and the liquid outlet end of the radial bearing liquid cooling channel 4231 can be made closer, so that the radial bearing liquid cooling channel 4231 is close to a complete annular structure, thereby increasing the total length of the radial bearing liquid cooling channel 4231 on the radial bearing end cover 4213 and improving the heat exchange efficiency.

[0077] In some embodiments, please combine Figure 2 、 Figure 4 and Figure 5As shown, radial bearing end cover 4213 includes an end cover body 42131 and a radial support portion 42132. Radial support portion 42132 is connected to end cover body 42131 and forms an integral structure with end cover body 42131. A shaft hole 421341 extending axially through the center of radial support portion 42132 is defined for mounting the compressor protective bearing and for allowing the rotor to pass through. Among them, the radial support portion 42132 is offset relative to the end cover body 42131 along the axial direction of the radial magnetic bearing 421 toward the side away from the radial bearing stator 4219, so that an avoidance space 42133 for accommodating part of the radial bearing stator 4219 is formed on the side of the radial bearing end cover 4213 facing the radial bearing stator 4219, and the radial support portion 42132 is formed with a mounting portion 42134, the mounting portion 42134 includes the above-mentioned axial hole 421341, a positioning step 421342 protruding from the inner wall surface of the axial hole 421341, and an annular support body 421343 protruding along the axial direction on the end surface of the radial support portion 42132 away from the radial bearing stator 4219, the annular support body 421343 extends around the axial edge of the through hole, the inner diameter of the annular support body 421343 is equal to the inner diameter of the through hole, and the inner wall of the annular support body 421343 smoothly transitions to the inner wall of the through hole. The protective bearing is mounted on mounting portion 42134, axially positioned by positioning step 421342 and radially positioned and supported by through-holes and annular support body 421343. In this embodiment, radial bearing end cap 4213 serves both as a housing component of radial magnetic bearing 421 and as a mounting base for the compressor's protective bearing. This makes radial bearing end cap 4213 versatile and contributes to a more compact compressor structure.

[0078] In addition, by offsetting the radial support portion 42132 relative to the end cover body 42131 along the axial direction of the radial magnetic bearing 421 toward the side away from the radial bearing stator 4219, on the one hand, the internal space of the air-cooling chamber 4210 is increased, which facilitates the installation and arrangement of the radial bearing stator 4219 and prevents interference between the radial bearing end cover 4213 and the radial bearing stator 4219; on the other hand, the mounting portion 42134 is offset axially away from the radial bearing stator 4219 to provide installation space for protecting the bearing.

[0079] In some embodiments, please combine Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown, the radial bearing liquid cooling channel 4231 includes a first liquid inlet channel 42311 communicating with the first liquid inlet 4217, a first liquid outlet channel 42312 communicating with the first liquid outlet 4218, and also includes a radial bearing heat conduction channel 42313 communicating with the first liquid inlet channel 42311 and the first liquid outlet channel 42312 respectively. The first liquid inlet channel 42311 and the first liquid outlet channel 42312 both extend in the radial direction of the radial bearing end cover 4213, and the radial bearing heat conduction channel 42313 extends in the circumferential direction of the radial bearing end cover 4213, wherein, along the axial direction of the radial magnetic bearing 421, the radial bearing heat conduction channel 42313 is arranged opposite to the radial bearing stator 4219. In this embodiment, the radially extending first liquid inlet channel 42311 and the first liquid outlet channel 42312 are aligned in the radial direction with the first liquid inlet 4217 and the first liquid outlet 4218 of the radial bearing seat 4212, so as to facilitate the straight-line connection of the external cooling pipeline, reduce the bending angle of the pipeline, and reduce the installation complexity and fluid resistance. The radial bearing heat conduction channel 42313 is set as a circumferentially extending annular channel that can surround the circumferential surface of the radial bearing stator 4219, increase the contact area between the coolant and the radial bearing stator 4219, and evenly cool the heating area of ​​the radial bearing stator 4219 (such as the winding and the iron core), thereby avoiding local overheating. In addition, the axially facing stator design allows the coolant to flow directly through the vicinity of the stator, shortening the heat exchange path and effectively improving the heat dissipation efficiency. For example, the heat generated by the radial bearing stator 4219 during operation can be quickly transferred to the coolant in the circumferential channel through the radial bearing end cover 4213, forming directional heat dissipation.

[0080] In some embodiments, the radial bearing heat conduction channel 42313 can be designed as a spiral or multi-loop structure to extend the residence time of the coolant in the radial bearing end cover 4213 and increase the heat exchange amount; at the same time, the circumferential flow can evenly distribute the flow to avoid local flow shortage.

[0081] In some embodiments, please combine Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the radial bearing heat conduction channel 42313 includes a first heat conduction channel 423131 and a second heat conduction channel 423132. The first heat conduction channel 423131 is formed inside the end cover body 42131, and the second heat conduction channel 423132 is formed inside the radial support portion 42132. The first heat conduction channel 423131 and the second heat conduction channel 423132 both extend in the circumferential direction, and a portion of the first heat conduction channel 423131 and a portion of the second heat conduction channel 423132 overlap and are connected in the axial direction.

[0082] Specifically, the first heat-conducting channel 423131 includes a first heat-conducting segment 4231311 and a second heat-conducting segment 4231312. Both the first heat-conducting segment 4231311 and the second heat-conducting segment 4231312 extend circumferentially along the radial magnetic bearing 421 and are spaced apart from each other. Along the circumferential direction of the radial magnetic bearing 421, the space between the first heat-conducting segment 4231311 and the second heat-conducting segment 4231312 defines a first connecting support structure 42135. The first connecting support structure 42135 serves as a support structure to enhance the overall structural strength of the radial bearing end cap 4213, enabling it to withstand significant axial pressure. Furthermore, a through-hole axially extending through the radial bearing end cap 4213 can be provided in the first connecting support structure 42135, enabling the radial bearing end cap 4213 to be fixedly connected to the stator bracket in the radial bearing stator 4219 using bolts or other fasteners.

[0083] Furthermore, the second heat-conducting channel 423132 includes a third heat-conducting segment 4231321 and a fourth heat-conducting segment 4231322. The third heat-conducting segment 4231321 and the fourth heat-conducting segment 4231322 both extend along the circumferential direction of the radial magnetic bearing 421 and are arranged at intervals. Along the circumferential direction of the radial magnetic bearing 421, the interval area between the third heat-conducting segment 4231321 and the fourth heat-conducting segment 4231322 defines a second connecting support structure 42136. On the one hand, the second connecting support structure 42136 serves as a supporting structure for improving the overall structural strength of the radial bearing end cover 4213, so that the radial bearing end cover 4213 can withstand a larger axial pressure. On the other hand, a through hole axially penetrating the radial bearing end cover 4213 can be provided in the second connecting support structure 42136, so that the radial bearing end cover 4213 can be fixedly connected to the stator bracket in the radial bearing stator 4219 by using bolts and other connecting parts.

[0084] In this embodiment, the first connecting support structure 42135 and the second connecting support structure 42136 are respectively arranged on both sides of the central axis of the radial bearing end cover 4213, thereby forming support structures in different areas, which can effectively reduce the stress concentration when the radial bearing end cover 4213 is connected to the stator bracket of the radial bearing stator 4219.

[0085] Furthermore, at least one first connection support portion is respectively provided inside the first heat conducting segment 4231311 and the second heat conducting segment 4231312. The function of the first connection support portion is the same as that of the first connection support structure 42135 and the second connection support structure 42136. The difference is that the first connection support portion does not separate the first heat conducting segment 4231311 or the second heat conducting segment 4231312 in the circumferential direction.

[0086] In this embodiment, please combine Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the first heat conducting segment 4231311 and the second heat conducting segment 4231312 each include multiple heat conducting regions 4231313 and a connecting region 4231314. The radial width of the heat conducting region 4231313 is greater than the radial width of the connecting region 4231314, so that the radial cross-sectional area of ​​the heat conducting region 4231313 is greater than the radial cross-sectional area of ​​the connecting region 4231314. The multiple heat conducting regions 4231313 are alternately arranged with the first connecting support portion, and each connecting region 4231314 is connected to two heat conducting regions 4231313 at both ends. When the radial bearing stator 4219 has multiple magnetic poles spaced circumferentially, the heat conducting regions 4231313 and the magnetic poles of the radial bearing stator 4219 are arranged axially opposite each other. In this embodiment, the width and cross-sectional area of ​​the heat conduction region 4231313 in the radial direction are larger, which can directly increase the contact area with the heat source (such as the stator winding and the iron core) and accelerate the conduction of heat from the stator to the coolant. The heat conduction region 4231313 is alternately arranged with the first connecting support portion, which can provide structural support for the radial bearing seat 4212 while ensuring the heat dissipation area, thereby avoiding the decrease in strength caused by large-area hollowing. It should also be noted that the magnetic poles of the radial bearing stator 4219, especially the windings and the core teeth, are the main heat sources. The heat conduction region 4231313 is directly aligned with the axial position of the magnetic poles to achieve point-to-point heat dissipation. Specifically, the stator magnetic poles are distributed at intervals along the circumference, and the heat conduction region 4231313 is synchronously arranged circumferentially according to the magnetic pole position, which can ensure that the heating area corresponding to each magnetic pole has a corresponding heat dissipation channel. A symmetrical heat dissipation structure is formed to avoid the imbalance of the stator temperature field caused by uneven heat dissipation and reduce the risk of thermal deformation during bearing operation.

[0087] In this embodiment, please combine Figure 2 、 Figure 3 、 Figure 7 and Figure 8 As shown, the first heat conducting segment 4231311 is connected to the second heat conducting segment 4231312 through the third heat conducting segment 4231321, and the third heat conducting segment 4231321 is connected to the fourth heat conducting segment 4231322 through the second heat conducting segment 4231312. Therefore, when the first connecting support structure 42135 and the second connecting support structure 42136 are provided, the first heat conducting channel 423131 and the second heat conducting channel 423132 together constitute mutually connected flow channels. The coolant flowing in from the first liquid inlet channel 42311 flows through the first heat conducting segment 4231311, the third heat conducting segment 4231321, the second heat conducting segment 4231312 and the fourth heat conducting segment 4231322 in sequence to the first liquid outlet channel 42312, thereby realizing the circulation of the coolant.

[0088] Furthermore, a plurality of connecting support columns 421113 are provided in the second heat conduction channel 423132 . The plurality of connecting support columns 421113 are arranged in sequence and spaced apart along the circumferential direction. By arranging the connecting support columns 421113 , the structural strength of the radial bearing end cover 4213 can be further improved.

[0089] In some embodiments, please combine Figure 9 、 Figure 10 and Figure 11 As shown, the axial magnetic bearing 422 further includes a first magnetic pole plate 4222, a second magnetic pole plate 4223, and an axial bearing winding 4224. Specifically, the axial bearing seat 4221 is generally disc-shaped and serves as a mounting base for the first magnetic pole plate 4222, the second magnetic pole plate 4223, and the axial bearing winding 4224. The axial bearing seat 4221 is used to connect to the compressor casing. Among them, the first magnetic pole plate 4222 is installed on the axial bearing seat 4221, the second magnetic pole plate 4223 is installed at one end of the first magnetic pole plate 4222 away from the axial bearing seat 4221 in the axial direction, and an installation cavity 42210 is formed between the first magnetic pole plate 4222 and the second magnetic pole plate 4223. The axial bearing winding 4224 is installed in the installation cavity 42210. The circumferential edge of the thrust plate in the compressor can extend into the installation cavity 42210, so that the thrust plate is axially located between the first magnetic pole plate 4222 and the second magnetic pole plate 4223, thereby limiting the axial position of the rotor of the compressor.

[0090] In this embodiment, please combine Figure 9 、 Figure 10 and Figure 11 As shown, the liquid-cooling channel 423 includes an axial bearing liquid-cooling channel 4232 formed in the axial bearing seat 4221. Generally, in a magnetic levitation compressor, the axial magnetic bearing 422 is generally arranged on one side of the first-stage impeller. Affected by the back heating of the first-stage impeller, when the compressor is running, the heat generated by the axial magnetic bearing 422 and the back heating of the first-stage impeller will cause the temperature of the axial magnetic bearing 422 facing the first-stage impeller to accumulate, resulting in overheating of the bearing. Therefore, in this embodiment, an axial bearing liquid-cooling channel 4232 is provided inside the axial bearing seat 4221. The coolant can directly absorb heat through the channel wall in the high-temperature core area, thereby achieving temperature control of the axial magnetic bearing 422 and reducing its temperature. It should also be noted that the axial bearing seat 4221 serves as a mounting carrier for the magnetic pole plate and the axial bearing winding 4224. The liquid-cooling channel 423 is directly integrated into the disc-shaped structure of the axial bearing seat 4221, avoiding welding or threaded connection of additional cooling pipes and reducing the risk of leakage.

[0091] In some embodiments, please combine Figure 9 、 Figure 10 、 Figure 11 and Figure 15 As shown, along the axial direction of the axial magnetic bearing 422, an assembly groove 422111 is provided on the side of the axial bearing seat 4221 facing the first magnetic pole plate 4222. From the radial outer side to the radial inner side of the axial bearing seat 4221, the assembly groove 422111 is configured as a plurality of annular grooves 4221111 of varying depths that are nested in sequence. The first magnetic pole plate 4222 is installed in the assembly groove 422111. The profile of the end face of the first magnetic pole plate 4222 axially facing the axial bearing seat 4221 matches the profile of the assembly groove 422111. The depth dimension of the annular groove 4221111 refers to the distance along the axial direction from the bottom wall of the annular groove 4221111 to the end face of the axial bearing seat 4221 facing the second magnetic pole plate 4223. In this embodiment, nested annular grooves 4221111 form multiple layers of radial constraints. The radially outermost annular groove 4221111 employs an interference fit to provide primary positioning for the first magnetic pole plate 4222. The inner annular groove 4221111 utilizes a transition fit to provide auxiliary support, enhancing the rigidity of the connection between the magnetic pole plate and the bearing seat. Furthermore, the nested groove structure increases the contact area between the magnetic pole plate and the bearing seat, forming a composite radial and axial heat conduction path, improving heat dissipation efficiency.

[0092] In some embodiments, please combine Figure 11 、 Figure 12 、 Figure 13 and Figure 14 As shown, the axial bearing liquid cooling channel 4232 includes a second liquid inlet channel 42321, a second liquid outlet channel 42322, and an axial bearing heat conduction channel 42323. Specifically, the second liquid inlet channel 42321 and the second liquid outlet channel 42322 both extend in the radial direction of the axial magnetic bearing 422, and the axial bearing heat conduction channel 42323 extends in the circumferential direction of the radial bearing end cover 4213. The liquid inlet of the axial bearing heat conduction channel 42323 communicates with the second liquid inlet channel 42321, and the liquid outlet of the axial bearing heat conduction channel 42323 communicates with the second liquid outlet channel 42322. Along the axial direction of the axial magnetic bearing 422, the axial bearing heat conduction channel 42323 is arranged opposite to the first magnetic pole plate 4222. In this embodiment, the radially extending second liquid inlet channel 42321 and second liquid outlet channel 42322 facilitate the straight-line connection of the external cooling pipeline, reduce the pipeline bending angle, and reduce installation complexity and fluid resistance. The axial bearing heat conduction channel 42323 is configured as a circumferentially extending annular channel that surrounds the circumferential surface of the axial bearing winding 4224. This increases the contact area between the coolant and the axial bearing seat 4221, ensuring uniform cooling of the heated area of ​​the axial bearing winding 4224 and preventing localized overheating. Furthermore, its axial orientation directly faces the first magnetic pole plate 4222, ensuring that the coolant's heat exchange area directly covers a majority of the first magnetic pole plate 4222, effectively improving heat dissipation efficiency.

[0093] In some embodiments, the axial bearing heat conduction channel 42323 can be designed as a spiral or multi-loop structure to extend the residence time of the coolant in the axial bearing seat 4221 and increase the heat exchange amount; at the same time, the circumferential flow can evenly distribute the flow to avoid local flow shortage.

[0094] In some embodiments, please combine Figure 11 、 Figure 13 and Figure 14 As shown, the axial bearing heat conduction channel 42323 includes a third heat conduction channel 423231 and a fourth heat conduction channel 423232. The first heat conduction channel 423131 and the second heat conduction channel 423132 both extend in the circumferential direction. The fourth heat conduction channel 423232 is located on the side of the third heat conduction channel 423231 facing away from the first magnetic pole plate 4222 along the axial direction of the axial magnetic bearing 422. Parts of the first heat conduction channel 423131 and the second heat conduction channel 423132 overlap and communicate with each other in the axial direction. Specifically, this arrangement allows the third heat conduction channel 423231 and the fourth heat conduction channel 423232 to conform to the structure of the axial bearing seat 4221, and ensures that each portion of the axial bearing heat conduction channel 42323 is close to the first magnetic pole plate 4222, thereby achieving more uniform heat dissipation from the first magnetic pole plate 4222.

[0095] Specifically, the fourth heat conduction channel 423232 includes a first heat conduction zone 4232321 and multiple second heat conduction zones 4232322. The first heat conduction zone 4232321 extends along the circumference of the axial magnetic bearing 422 and has an annular structure, communicating with the third heat conduction channel 423231. The second heat conduction zone 4232322 connects to and communicates with the inner annular edge of the first heat conduction zone 4232321. The multiple second heat conduction zones 4232322 are sequentially spaced along the circumference of the axial magnetic bearing 422. In this embodiment, the multiple second heat conduction zones 4232322 are independently connected to the first heat conduction zone 4232321. During the circulation of the coolant in the first heat conduction zone 4232321, the coolant can also enter the second heat conduction zones 4232322. Therefore, the provision of multiple second heat conduction zones 4232322 increases the overall heat exchange area of ​​the fourth heat conduction channel 423232, thereby improving heat dissipation efficiency. It should also be noted that, along the circumferential direction, the spacing area between any two adjacent second heat conduction zones 4232322 defines a second connecting support portion, and the function of the second connecting support portion is: on the one hand, it serves as a supporting structure to improve the overall structural strength of the axial bearing seat 4221, so that the axial bearing seat 4221 can withstand a larger axial pressure; on the other hand, a through hole axially passing through the axial bearing seat 4221 can be provided in the second connecting support portion, so that the axial bearing seat 4221 can be fixedly connected to the first magnetic pole plate 4222 by means of bolts and other connecting parts.

[0096] In some embodiments, please combine Figure 11 、 Figure 13 and Figure 14 As shown, at least one third connecting support structure 422112 is further provided in the axial bearing liquid-cooling flow channel 4232. The third connecting support structure 422112 is provided in the axial direction of the axial magnetic bearing 422 and is provided with a connecting hole for allowing a connecting member to pass through to connect the first magnetic pole plate 4222 and the axial bearing seat 4221. The third connecting support structure 422112 has the same function as the second connecting support portion: on the one hand, it serves as a supporting structure for improving the overall structural strength of the axial bearing seat 4221, enabling the axial bearing seat 4221 to withstand greater axial pressure; on the other hand, a through hole axially penetrating the axial bearing seat 4221 can be provided in the second connecting support portion to facilitate fixed connection between the axial bearing seat 4221 and the first magnetic pole plate 4222 using connecting members such as bolts.

[0097] In this embodiment, a thermal insulation film 4225 is further provided on the inner annular surface of the axial bearing winding 4224. The thermal insulation film 4225 prevents heat from diffusing inward while allowing heat to be discharged preferentially through the outer heat dissipation structure such as the axial bearing liquid cooling channel 4232, thereby forming a directional heat dissipation path, avoiding heat accumulation in the area where the axial bearing winding 4224 is located, and improving the overall heat dissipation efficiency.

[0098] According to an embodiment of the present invention, a compressor is also proposed, which includes a magnetic bearing, a rotor, an impeller, a motor, etc., wherein the impeller is fixed to one end of the rotor, the magnetic bearing includes two radial magnetic bearings 421 and one axial magnetic bearing 422, and the rotor is sequentially arranged in the two radial magnetic bearings 421 and the axial magnetic bearing 422, and the magnetic bearing is used to realize the suspension of the rotor and its axial and radial limitation. The compressor proposed in the present invention is a centrifugal air compressor, which can be a single-stage centrifugal air compressor, a multi-stage centrifugal air compressor, or a magnetically suspended centrifugal air compressor. The compressor can also be a centrifugal machine used in a refrigeration system, that is, a centrifugal compressor.

[0099] According to an embodiment of the present invention, an air compressor is also provided, comprising the aforementioned compressor 1, an intercooler (not shown), and a compressed air circuit (not shown) connecting the various compression chambers in the compressor. The compressor comprises at least two stages of compression chambers, each of which is equipped with a centrifugal impeller. The at least two stages of compression chambers are sequentially connected in series via the compressed air circuit to achieve stage-by-stage compression. The compressed air circuit is a pipeline for the circulation of compressed gas. An intercooler is connected in series within the compressed air circuit, one of which is located between each of the two compression chambers. The intercooler is used to cool the high-temperature, high-pressure air discharged from the previous compression chamber.

[0100] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A magnetic bearing, used for sleeve installation outside the rotor of a compressor, characterized in that: The magnetic bearing comprises: A support assembly, used for fixedly connecting to the casing of the compressor; a bearing stator assembly mounted on the support assembly; The support assembly is provided with at least one liquid cooling channel, at least part of which is arranged opposite to the bearing stator assembly along the axial direction of the magnetic bearing and can exchange heat with the bearing stator assembly.

2. The magnetic bearing according to claim 1, characterized in that: The magnetic suspension bearing includes a radial magnetic bearing, and the radial magnetic bearing is used to provide radial support force to the rotor; The support assembly includes a radial support assembly, the radial magnetic bearing includes the radial support assembly, the bearing stator assembly includes a radial bearing stator, the radial magnetic bearing includes the radial bearing stator; The liquid cooling channel includes a radial bearing liquid cooling channel provided in the radial support assembly.

3. The magnetic bearing according to claim 2, characterized in that: The radial magnetic bearing also includes a radial bearing magnetic pole plate, which is installed on the radial support assembly. An air-cooling cavity is defined between the radial support assembly and the magnetic pole plate, and the radial bearing stator is installed in the air-cooling cavity. The radial support assembly is provided with an air inlet and an air outlet communicating with the air-cooling cavity.

4. The magnetic bearing according to claim 3, characterized in that: The radial support assembly comprises: The radial bearing seat is annular and connected to the radial bearing magnetic pole plate. a radial bearing end cover, fixedly mounted on the inner annular surface of the radial bearing seat, and spaced apart from the radial bearing magnetic pole plate along the axial direction of the radial magnetic bearing, wherein the radial bearing end cover, the radial bearing seat and the radial bearing magnetic pole plate enclose the air-cooling cavity; Wherein, the air inlet and the air outlet are arranged on the radial bearing seat, and the radial bearing liquid cooling channel is arranged on the radial bearing end cover.

5. The magnetic bearing according to claim 4, characterized in that: The radial support assembly also includes a first support member, which is installed on the inner annular surface of the radial bearing seat and is spaced apart from the radial bearing end cover along the axial direction of the radial magnetic bearing. The radial bearing magnetic pole plate is installed on a side of the first support member away from the radial bearing end cover.

6. The magnetic bearing according to claim 4, characterized in that: Along the radial direction of the radial magnetic bearing, the air inlet and the air outlet respectively penetrate the inner circumferential surface of the radial bearing seat; And / or, the radial bearing seat is provided with a first liquid inlet and a first liquid outlet, and along the radial direction of the radial magnetic bearing, the first liquid inlet and the first liquid outlet respectively pass through the inner circumferential surface of the radial bearing seat, the first liquid inlet is communicated with the liquid inlet end of the radial bearing liquid cooling channel, and the first liquid outlet is communicated with the liquid outlet end of the radial bearing liquid cooling channel.

7. The magnetic bearing according to claim 6, characterized in that: The radial support assembly further includes an air duct shell, which is mounted on the circumferential outer wall of the radial bearing seat. The air duct shell is provided with an air inlet channel, which is communicated with the air inlet.

8. The magnetic bearing according to claim 6, characterized in that: The angle between the shortest line segments from the outer end centers of the first liquid inlet and the first liquid outlet to the axis of the radial bearing seat is a, and the value range of a is 4°<a≤20°.

9. The magnetic bearing according to claim 4, characterized in that: The radial bearing end cover includes an end cover body and a radial support portion connected to the end cover body. The radial support portion and the end cover body jointly define an avoidance space, and the avoidance space is used to avoid the radial bearing stator. Along the axial direction of the radial magnetic bearing, the radial support portion is formed with a mounting portion, and the mounting portion is used to install a protective bearing.

10. The magnetic bearing according to claim 9, characterized in that: The radial bearing liquid cooling channel includes a first liquid inlet channel, a first liquid outlet channel and a radial bearing heat conduction channel, wherein the liquid inlet of the radial bearing heat conduction channel is communicated with the first liquid inlet channel, and the liquid outlet of the radial bearing heat conduction channel is communicated with the first liquid outlet channel; Wherein, along the axial direction of the radial magnetic bearing, the radial bearing heat conduction channel and the radial bearing stator are arranged opposite to each other.

11. The magnetic bearing according to claim 10, characterized in that: The radial bearing heat conduction channel includes a first heat conduction channel formed on the end cover body and a second heat conduction channel formed on the radial support portion, the first heat conduction channel includes a first heat conduction segment and a second heat conduction segment extending along the circumference of the radial magnetic bearing, the second heat conduction channel includes a third heat conduction segment and a fourth heat conduction segment extending along the circumference of the radial magnetic bearing, the first heat conduction segment communicates with the second heat conduction segment through the third heat conduction segment, and the third heat conduction segment communicates with the fourth heat conduction segment through the second heat conduction segment; Wherein, along the circumference of the radial magnetic bearing, a first connecting support structure is provided between the first heat conducting segment and the second heat conducting segment, and a second connecting support structure is provided between the third heat conducting segment and the fourth heat conducting segment.

12. The magnetic bearing according to any one of claims 1 to 11, characterized in that: The magnetic suspension bearing includes an axial magnetic bearing, which is used to provide axial support force to the rotor shaft; the support assembly includes an axial bearing seat, the axial magnetic bearing has the axial bearing seat, and the bearing stator assembly includes an axial bearing winding, and the axial magnetic bearing has the axial bearing winding; The liquid-cooling channel includes an axial bearing liquid-cooling channel formed in the axial bearing seat.

13. The magnetic bearing according to claim 12, characterized in that: The axial magnetic bearing further comprises: a first magnetic pole plate, mounted on the axial bearing seat; a second magnetic pole plate connected to the first magnetic pole plate and defining a mounting cavity between the second magnetic pole plate and the first magnetic pole plate; Wherein, the axial bearing winding is installed in the installation cavity.

14. The magnetic bearing according to claim 13, characterized in that: Along the axial direction of the axial magnetic bearing, a mounting groove is provided on a side of the axial bearing seat facing the first magnetic pole plate, and at least a portion of the first magnetic pole plate is installed in the mounting groove.

15. The magnetic bearing according to claim 13, characterized in that: The axial bearing liquid cooling channel includes a second liquid inlet channel, a second liquid outlet channel and an axial bearing heat conduction channel, the liquid inlet of the axial bearing heat conduction channel is communicated with the second liquid inlet channel, and the liquid outlet of the axial bearing heat conduction channel is communicated with the second liquid outlet channel; Wherein, along the axial direction of the axial magnetic bearing, the axial bearing heat conduction channel is arranged opposite to the first magnetic pole plate.

16. The magnetic bearing according to claim 15, characterized in that: The axial bearing heat-conducting flow channel includes a third heat-conducting flow channel and a fourth heat-conducting flow channel. The third heat-conducting flow channel surrounds the fourth heat-conducting flow channel and the two are connected. Part of the wall of the third heat-conducting flow channel and part of the wall of the fourth heat-conducting flow channel form a step. The fourth heat-conducting flow channel is located on the side of the third heat-conducting flow channel away from the first magnetic pole plate along the axial direction of the axial magnetic bearing. The third heat-conducting flow channel is respectively connected to the second liquid inlet channel and the second liquid outlet channel.

17. The magnetic bearing according to claim 16, characterized in that: The fourth heat conduction channel includes: a first heat conduction zone extending along the circumference of the axial magnetic bearing and having an annular structure, and communicating with the third heat conduction channel; A plurality of second heat conduction areas are connected to and communicated with the inner ring edge of the first heat conduction area, and the plurality of second heat conduction areas are sequentially spaced along the circumference of the axial magnetic bearing.

18. The magnetic bearing according to claim 16, characterized in that: At least one third connecting support structure is also provided in the liquid-cooling channel of the axial bearing. Along the radial direction of the axial magnetic bearing, the third connecting support structure forms a protrusion in the liquid-cooling channel of the axial bearing and is provided with a connecting hole. The connecting hole is used for a connecting member to pass through to connect the first magnetic pole plate and the axial bearing seat.

19. A compressor, characterized in that: The magnetic bearing comprises the magnetic bearing according to any one of claims 1 to 18.

20. An air compressor, characterized in that: The air compressor includes the compressor according to claim 19.

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