WO2020134504A1 - 电机转子、压缩机和空调设备 - Google Patents

电机转子、压缩机和空调设备 Download PDF

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Publication number
WO2020134504A1
WO2020134504A1 PCT/CN2019/113911 CN2019113911W WO2020134504A1 WO 2020134504 A1 WO2020134504 A1 WO 2020134504A1 CN 2019113911 W CN2019113911 W CN 2019113911W WO 2020134504 A1 WO2020134504 A1 WO 2020134504A1
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WIPO (PCT)
Prior art keywords
shaft body
motor rotor
sleeve
compressor
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/113911
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English (en)
French (fr)
Inventor
刘华
张治平
钟瑞兴
李宏波
陈玉辉
叶文腾
亓静利
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Filing date
Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Publication of WO2020134504A1 publication Critical patent/WO2020134504A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/057—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

  • the present disclosure relates to the field of refrigeration equipment, and in particular, to a motor rotor, compressor, and air conditioning equipment.
  • Centrifugal refrigeration compressors are high-speed compressors.
  • the compressor rotor rotates at high speed during operation, and reliable bearings are needed to support the rotor.
  • the bearings used in conventional rotors mainly include rolling bearings, oil film bearings and magnetic suspension bearings.
  • the compressor requires an additional oil lubrication system and a complicated oil supply oil circuit system.
  • the refrigerant and the lubricant are compatible, and a separation system needs to be added to the system, which will cause the entire system to be too complicated and huge.
  • the rotors of motors used in conventional centrifugal compressors are of an integrated structure.
  • the weight of the compressor rotor of this structure is relatively heavy, which is not conducive to the improvement of the rotor's critical speed.
  • the processing process is relatively complicated, and the equipment requirements are relatively high, which will increase the cost.
  • the existing compressor mainly increases the critical speed of the rotor by reducing the length of the rotor or increasing the rigidity of the bearing.
  • reducing the length of the rotor is affected by the size of each component, and the degree of optimization can be relatively small. Improving the bearing stiffness, the need to increase the bearing volume at high speeds will cause the compressor to become larger overall, violating the development trend of miniaturization.
  • the present disclosure aims to provide a motor rotor, a compressor, and an air-conditioning device to improve the problem of low critical rotation speed of the motor rotor due to a large weight in the related art.
  • the present disclosure provides a motor rotor.
  • the motor rotor includes:
  • the shaft body is connected to the magnetic part and extends in the direction away from the magnetic part in the axial direction of the motor rotor.
  • the shaft body includes a cavity extending along the axial direction and a connecting part for connecting the compression working part, the connecting part and the cavity are arranged at intervals .
  • the cavity is directed from the end of the shaft body away from the connecting portion toward the other end of the shaft body in the axial direction of the motor rotor.
  • the motor rotor further includes a sleeve connected to the shaft body, and the magnetic part is sleeved in the sleeve.
  • the shaft body includes:
  • the first shaft body is connected to the sleeve and is located at the first end of the magnetic portion along the axial direction of the motor rotor; and/or
  • the second shaft body is connected to the sleeve and is located at the second end of the magnetic part along the axial direction of the motor rotor.
  • At least part of the first shaft body and at least part of the second shaft body are sleeved in the sleeve.
  • first shaft body and the sleeve are integral, and at least part of the second shaft body is sleeved in the sleeve.
  • the motor rotor further includes a first flow passage for exhausting gas in the sleeve when the magnetic portion is sleeved in the sleeve.
  • the first flow channel includes:
  • a first hole extending from one end of the magnetic part along the axial direction of the motor rotor to the other end;
  • the second hole is provided on the shaft body and communicates with the cavity provided on the shaft body.
  • a compressor including the motor rotor of the compressor described above.
  • the compressor further includes:
  • Centrifugal impeller connected to the end of the shaft body away from the magnetic part
  • the diffuser is used to compress the refrigerant accelerated by the centrifugal impeller.
  • the compressor further includes an air suspension bearing for carrying the rotor of the motor.
  • an air conditioner including the compressor described above.
  • the shaft body of the motor rotor is provided with a cavity, which improves the problem of low critical speed caused by the heavy weight of the motor rotor in the related art.
  • the cavity and the connecting portion for connecting the compression working component are arranged at intervals, the motor rotor is provided with a cavity for reducing weight while retaining the connecting portion for installing the compression working component, the motor rotor has a simple structure and is easy to process And the advantages of low manufacturing costs.
  • FIG. 1 shows a schematic structural diagram of a motor rotor of a compressor of an embodiment of the present disclosure
  • FIG. 2 shows a schematic structural diagram of a compressor of an embodiment of the present disclosure.
  • FIG. 1 shows a schematic structural diagram of a motor rotor of the compressor of this embodiment
  • FIG. 2 shows a schematic structural diagram of the compressor of this embodiment.
  • the motor rotor of the compressor includes a magnetic portion 1 for rotating under the action of a current-carrying coil 13 and a magnetic portion 1 connected to the magnetic portion 1 and extending away from the magnetic portion 1 in the axial direction of the motor rotor
  • the shaft body 2 includes a cavity 3 extending along the axial direction thereof and a connecting portion 5 for connecting a compression working component.
  • the connecting portion 5 and the cavity 3 are spaced apart.
  • the connecting portion 5 is provided at the end of the shaft body.
  • the rotor of the motor in this embodiment is provided with a cavity 3 extending along its axial direction.
  • the weight of the electronic rotor is reduced, which is beneficial to increase the maximum speed of the motor rotor.
  • the cavity 3 is spaced apart from the connecting part for connecting the compression working parts.
  • the motor rotor is provided with the cavity 3 for weight reduction while retaining the connecting part for installing the compression working part.
  • the motor rotor has a simple structure, is easy to process and The advantage of low manufacturing cost.
  • the shaft body 2 includes a first shaft body 2 a at the first end in the axial direction of the magnetic portion 1 and a second shaft body 2 b at the second end in the axial direction of the magnetic portion 1.
  • the cavity 3 on the first shaft body 2a extends from the end of the first shaft body 2a adjacent to the magnetic portion 1 toward the first end provided with the connecting portion 5.
  • the cavity 3 on the second shaft body 2b extends from one end of the second shaft body 2b adjacent to the magnetic portion 1 toward the other end.
  • the end of the second shaft body 2b away from the magnetic portion 1 is provided with a connecting portion 5.
  • the motor rotor further includes a sleeve 4 connected to the shaft body 2, and the magnetic part 1 is sleeved in the sleeve 4. At least part of the first shaft body 2a and at least part of the second shaft body 2b are sleeved in the sleeve 4.
  • the whole of the first shaft body 2a, the magnetic part 1 and the second shaft body 2b can be sleeved into the sleeve 4 which is open at both ends.
  • the gas in the sleeve 4 can be discharged through the port of the sleeve 4, so there is no need to add an exhaust flow path.
  • the sleeve 4 and the first shaft body 2a are integrated.
  • the magnetic portion 1 and the second shaft body 2b are sequentially inserted into the sleeve 4.
  • the motor rotor also includes a first flow path for exhausting the gas in the sleeve 4 when the magnetic portion 1 is sleeved in the sleeve 4.
  • the first flow channel includes a first hole provided on the magnetic part 1, and the first hole extends from one end of the magnetic part 1 along the axial direction of the motor rotor to the other end.
  • the gas in the sleeve 4 is discharged to the side of the magnetic part 1 facing away from the first shaft body 2 a through the first hole.
  • the first flow channel includes a second hole disposed on the first shaft body 2a, and the second hole communicates with the cavity 3 on the first shaft body 2a.
  • the gas in the sleeve 4 is discharged through the cavity 3 on the first shaft body 2a and the second hole.
  • FIG. 2 shows a schematic structural diagram of the compressor of this embodiment.
  • the compressor of this embodiment includes a motor rotor.
  • the motor rotor includes a magnetic portion 1 and a shaft body 2 connected to the magnetic portion 1.
  • the compressor also includes a centrifugal compression section driven by a motor rotor.
  • the centrifugal compression part includes a centrifugal impeller 8 mounted on the connection part 5 of the motor rotor, a diffuser 9 for compressing the refrigerant accelerated by the centrifugal impeller 8 therein, and a volute 10 that discharges the compressed refrigerant.
  • the centrifugal compression section includes a first centrifugal compression section provided at the first end of the motor rotor and a second centrifugal compression section provided at the second end of the motor rotor.
  • the suction port of the second centrifugal compression part communicates with the exhaust port of the first centrifugal compression part, and the second centrifugal compression part is used to compress the refrigerant compressed by the first centrifugal compression part.
  • the compressor also includes a bearing support 11 and a bearing 12 mounted on the bearing support 11, the bearing 12 being used to carry the motor rotor.
  • the bearing 12 is an air suspension bearing.
  • the air suspension bearing is a dynamic pressure air suspension bearing.
  • the motor rotor of the compressor of this embodiment is mainly composed of three sections of a first shaft body 2a, a magnetic portion 1 and a second shaft body 2b, wherein the middle section is the magnetic portion 1, the first shaft body 2a and An axially extending cavity 3 is provided on the second shaft body 2b.
  • the overall quality of the motor rotor is reduced, thereby increasing the rotor's critical speed and increasing the bearing capacity of the bearing.
  • the compressor of this embodiment is a two-stage dynamic pressure air suspension centrifugal compressor.
  • the compressor includes a first compression section, a second compression section for compressing the refrigerant compressed by the first compression section, a motor for driving the first compression section and the second compression section, and a circulating air supply self-cooling system.
  • the circulating air supply self-cooling system provides the bearing 12 in the compressor cavity with a cooling medium for cooling and/or lubrication.
  • the motor rotor system of the compressor mainly includes a centrifugal impeller 8 in the first compression part, a hollow first shaft body 2a, a magnetic part 1, a hollow second shaft body 2b, a centrifugal impeller 8 in the second compression part, and a thrust bearing thrust body.
  • the shaft body 2 of the motor rotor of the compressor includes a hollow structure and a solid structure.
  • the motor rotor of this structure type can be applied to rotating machinery such as centrifugal refrigeration compressors and screw refrigeration compressors.
  • the bearings involved in the solution may be sliding bearings, rolling bearings, magnetic suspension bearings or air suspension bearings. Considering the simple structure of oil-free and environmental protection, air suspension bearings are preferred.
  • the motor rotor is mainly composed of three sections of the first shaft body 2a, the magnetic portion 1 and the second shaft body 2b, the left and right shaft bodies 2 are processed into a hollow structure, and the central magnetic portion 1 is omitted in the middle.
  • the shaft is beneficial to simplify the structure and reduce assembly.
  • the connecting portion 5 for installing the impeller at the end of the first shaft body 2a away from the magnetic portion is a solid structure, and the cavity 3 on the first shaft body 2a extends from the end of the first shaft body 2a adjacent to the magnetic portion toward the other end.
  • the second shaft body 2b at the right end has a similar structure to the first shaft body 2a, and the first shaft body 2a and the second shaft body 2b are symmetrically arranged on both sides of the magnetic portion 1.
  • a sleeve 4 is sleeved on the outer surfaces of the first shaft body 2a, the magnetic portion 1 and the second shaft body 2b to connect the first shaft body 2a, the magnetic portion 1 and the second shaft body 2b together.
  • the above three components are interference-connected with the sleeve, and the sleeve 4 passes through the three components as a whole. This structure does not need to add a vent hole during the installation process, which effectively prevents the hot jacket gas from being excluded.
  • the connecting parts 5 at both ends of the motor rotor have a solid structure.
  • the connecting portion 5 is used to mount the centrifugal impeller 8.
  • the centrifugal impeller 8 and the connecting portion 5 are axially locked by using a lock nut, and at the same time, the radial positioning of the centrifugal impeller 8 can use interference or gap connection.
  • the inner diameter of the cavity 3 on the shaft body 2 needs to be strictly controlled to prevent the contact area between the shaft body and the magnetic portion 1 from being too small and damaging the magnetic portion 1, that is, D hole ⁇ (1/2) D magnetic portion 1.
  • the volume product of the cavity 3 on the two shaft bodies 2 remains the same, or the solid body of the shaft body is adjusted to make the center of gravity close to the center of the integral rotor.
  • the rotor of the motor is processed separately, and the first shaft body 2a, the second shaft body 2b and the magnetic part 1 are processed separately, which can effectively ensure the required key size, simplify the processing complexity, facilitate the rotor inspection, and improve the inspection accuracy .
  • the hollow structure close to the side of the magnetic portion 1 can reduce the machining accuracy of the hole and can improve the machining efficiency.
  • the present disclosure uses dynamic pressure air suspension bearings, which not only eliminates the need for the compressor to use lubricating oil and control systems, but also makes the compressor more environmentally friendly and has a simpler structure; at the same time, it also solves the difficult problem of integrated inspection of the compressor rotor and effectively improves the rotor
  • the critical rotation speed ensures the reliability and safety of the shafting and reduces the maintenance cost of the compressor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

本公开涉及一种适用于悬浮轴承的电机转子、压缩机和空调设备，电机转子包括：磁性部(1)，用于在通电线圈的作用下转动；以及轴体(2)，与磁性部(1)连接并沿电机转子的轴向朝远离磁性部(1)的方向延伸，轴体(2)包括沿其轴向延伸的空腔(3)和用于连接压缩工作部件的连接部(5)，连接部(5)和空腔(3)间隔设置。

Description

电机转子、压缩机和空调设备
本公开是以CN申请号为CN201811593752.8，申请日为2018年12月25的申请为基础，并主张其优先权，该CN申请的公开内容在此作为整体引入本公开中。
技术领域
本公开涉及制冷设备领域，具体而言，涉及一种电机转子、压缩机和空调设备。
背景技术
离心式制冷压缩机属于高速度型压缩机，压缩机转子在工作中高速旋转，需要可靠的轴承对转子进行支撑。常规转子使用的轴承主要有滚动轴承、油膜轴承、磁悬浮轴承。对于滚动轴承和油膜轴承，压缩机需要额外的油润滑系统以及复杂的供油油路系统，同时在制冷剂与润滑油具有兼容性，需要在系统里面增加分离系统，这会导致整个系统过于复杂和庞大。
由于滚动轴承和油膜轴承承载力较高，常规离心式压缩机使用的电机转子都是一体式结构，该结构的压缩机转子重量相对较重，不利于转子临界转速的提升。一体式结构在制作较大的转子时，加工过程相对发杂，且对设备要求相对较高，会增加成本。
因此，为了解决压缩机复杂油路系统，出现了无油环保的磁悬浮轴承。对于磁悬浮轴承，省去了供油系统和分离系统，却增加了更加复杂的控制系统，由于磁悬浮轴承需要稳定的电源，为防止系统突然断电，需要增加保护系统，这导致整个压缩机维护成本增加，结构更加复杂化。
而为了解决压缩机转子临界转速问题，现有压缩机主要通过减少转子的长度或者提高轴承的刚度来提高转子的临界转速。但是减少转子长度方向，受到各零部件大小尺寸的影响，可以优化的程度相对较少。提高轴承刚度，在高转速下需要增大轴承的体积，会导致压缩机整体变大，违背了小型化的发展趋势。
公开内容
本公开旨在提供一种电机转子、压缩机和空调设备，以改善相关技术中存在的电机转子因重量较大而导致的临界转速低的问题。
根据本公开实施例的一个方面，本公开提供了一种电机转子，电机转子包括：
磁性部，用于在通电线圈的作用下转动；以及
轴体，与磁性部连接并沿电机转子的轴向远离磁性部的方向延伸，轴体包括沿其轴向延伸的空腔和用于连接压缩工作部件的连接部，连接部和空腔间隔设置。
在一些实施例中，空腔由轴体的远离连接部的一端沿电机转子的轴向朝轴体的另一端。
在一些实施例中，电机转子还包括与轴体连接的套筒，磁性部套设在套筒内。
在一些实施例中，轴体包括：
第一轴体，与套筒连接，并位于磁性部的沿电机转子的轴向的第一端；和/或
第二轴体，与套筒连接，并位于磁性部的沿电机转子的轴向的第二端。
在一些实施例中，至少部分第一轴体和至少部分第二轴体套设在套筒内。
在一些实施例中，第一轴体与套筒是一体的，至少部分第二轴体套设在套筒内。
在一些实施例中，电机转子还包括用于在磁性部套入套筒内时排出套筒内的气体的第一流道。
在一些实施例中，第一流道包括：
第一孔道，由磁性部的沿电机转子的轴向的一端延伸至另一端；和/或
第二孔道，设在轴体上，并与设在轴体上的空腔连通。
根据本公开的另一方面，还提供了一种压缩机，压缩机包括上述的压缩机的电机转子。
在一些实施例中，压缩机还包括：
离心叶轮，连接在轴体的远离磁性部的一端；以及
扩压器，用于经离心叶轮加速后的冷媒在其内压缩。
在一些实施例中，压缩机还包括用于承载电机转子气悬浮式轴承。
根据本公开的另一方面，还提供了一种空调设备，空调设备包括上述的压缩机。
应用本公开的技术方案，电机转子的轴体上设有空腔，改善了相关技术中存在的电机转子因重量较大而导致的临界转速低的问题。进一步地，空腔与用于连接压缩工作部件的连接部间隔设置，电机转子在设置有减重的空腔的同时保留了用于安装压缩工作部件的连接部，电机转子具有结构简单、易于加工和制造成本低的优点。
附图说明
构成本公开的一部分的附图用来提供对本公开的进一步理解，本公开的示意性实 施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1示出了本公开的实施例的压缩机的电机转子的结构示意图；以及
图2示出了本公开的实施例的压缩机的结构示意图。
图中：
1、磁性部；2、轴体；3、空腔；4、套筒；5、连接部；8、离心叶轮；9、扩压器；10、蜗壳；11、轴承支座；12、轴承。
具体实施方式
为使本公开的目的、技术方案和优点更加清楚明白，下面结合实施方式和附图，对本公开做进一步详细说明。在此，本公开的示意性实施方式及其说明用于解释本公开，但并不作为对本公开的限定。
图1示出了本实施例的压缩机的电机转子的结构示意图；图2示出了本实施例的压缩机的结构示意图。如图1所示，本实施例中，压缩机的电机转子包括用于在通电线圈13的作用下转动的磁性部1和与磁性部1连接并沿电机转子的轴向远离磁性部1延伸的轴体2，轴体2包括沿其轴向延伸的空腔3和用于连接压缩工作部件的连接部5，连接部5和空腔3间隔设置。其中，连接部5设在轴体的端部。
本实施例中的电机转子上设置有沿其轴向延伸的空腔3，电子转子的重量降低，有利于提升电机转子的最高转速。
空腔3与用于连接压缩工作部件的连接部间隔设置，电机转子在设置有减重的空腔3的同时保留了用于安装压缩工作部件的连接部，电机转子具有结构简单、易于加工和制造成本低的优点。
轴体2包括位于磁性部1的轴向的第一端的第一轴体2a和位于磁性部1的轴向的第二端的第二轴体2b。
第一轴体2a上的空腔3由第一轴体2a的邻近磁性部1的一端朝设有连接部5的第一端延伸。第二轴体2b上的空腔3由第二轴体2b的邻近磁性部1的一端朝另一端延伸。在一些实施例中，第二轴体2b的远离磁性部1的一端设有连接部5。
电机转子还包括与轴体2连接的套筒4，磁性部1套设在套筒4内。至少部分第一轴体2a和至少部分第二轴体2b套设在套筒4内。
在组装电机转子的过程中，可将第一轴体2a、磁性部1和第二轴体2b整体一起套入到两端开口的套筒4中，在将第一轴体2a、磁性部1和第二轴体2b装入套筒的 过程中，套筒4内的气体可经套筒4的端口排出，因此无需增设排气流道。
如图2所示，在一些实施例中，套筒4和第一轴体2a是一体的。磁性部1和第二轴体2b依次套入套筒4中。电机转子还包括用于在将磁性部1套入套筒4时排出套筒4内的气体的第一流道。
在一些实施例中，第一流道包括设在磁性部1上的第一孔道，第一孔道由磁性部1的沿电机转子的轴向的一端延伸至另一端。在将磁性部1套入套筒4时，套筒4内的气体经第一孔道向磁性部1的背对第一轴体2a的一侧排出。
在一些实施例中，第一流道包括设置在第一轴体2a上的第二孔道，第二孔道与第一轴体2a上的空腔3连通。在将磁性部1套入套筒4时，套筒4内的气体经第一轴体2a上的空腔3和第二孔道排出。
根据本公开的另一方面还提供了一种压缩机，图2示出了本实施例的压缩机的结构示意图。如图2所示，本实施例的压缩机包括电机转子，电机转子包括磁性部1和与磁性部1连接的轴体2。
压缩机还包括有电机转子驱动的离心压缩部。离心压缩部包括安装在电机转子的连接部5上的离心叶轮8、用于经离心叶轮8加速后的冷媒在其中压缩的扩压器9以及排出压缩后的冷媒的蜗壳10。
离心压缩部包括设在电机转子的第一端的第一离心压缩部和设在电机转子的第二端的第二离心压缩部。第二离心压缩部的吸气口与第一离心压缩部的排气口连通，第二离心压缩部用于压缩经第一离心压缩部压缩后的冷媒。
压缩机还包括轴承支座11和安装在轴承支座11上的轴承12，轴承12用于承载电机转子。轴承12为气悬浮轴承。优选地，气悬浮轴承为动压气悬浮轴承。
如图1所示，本实施例的压缩机的电机转子主要由第一轴体2a、磁性部1和第二轴体2b三段组成，其中中间段为磁性部1，第一轴体2a和第二轴体2b上设置有轴向延伸的空腔3。电机转子的整体质量降低，从而提升了转子的临界转速，提高轴承的承载力。
本实施例的压缩机为双级动压气悬浮离心压缩机。压缩机包括第一压缩部、用于压缩第一压缩部压缩后的冷媒的第二压缩部、用于驱动第一压缩部和第二压缩部的电机以及循环供气自冷却系统。循环供气自冷却系统为压缩机腔体内的轴承12提供用于降温和/或润滑的冷媒。
压缩机的电机转子系统主要包含第一压缩部的离心叶轮8、中空式第一轴体2a、 磁性部1、中空式第二轴体2b、第二压缩部的离心叶轮8以及推力轴承止推体。其中，压缩机的电机转子的轴体2包括中空结构和实心结构。该结构类型的电机转子可适用于离心式制冷压缩机、螺杆式制冷压缩机等旋转机械。
方案涉及到的轴承可以是滑动轴承，也可以是滚动轴承，也可以使磁悬浮轴承或者是气悬浮轴承，考虑无油环保结构简单，优选气悬浮轴承。
如图2所示，电机转子主要由第一轴体2a、磁性部1和第二轴体2b三段组成，左右两段轴体2加工成空心结构，中间为整体磁性部1省去中间芯轴，有利于简化结构，减少装配。第一轴体2a的远离磁性部的一端的用于安装叶轮的连接部5为实体结构，第一轴体2a上的空腔3由第一轴体2a邻近磁性部的一端朝另一端延伸。
右端的第二轴体2b为与第一轴体2a成类似的结构，第一轴体2a和第二轴体2b对称地布置在磁性部1的两侧。
在第一轴体2a、磁性部1和第二轴体2b外表面套设套筒4，以将第一轴体2a、磁性部1和第二轴体2b连接在一起。上述三个部件与套筒过盈连接，套筒4整体穿过三个部件，该结构在安装过程中，无需增加排气孔，有效防止热套气体无法排除。
电机转子两端的连接部5为实心结构。连接部5用于安装离心叶轮8。离心叶轮8与连接部5使用锁紧螺母进行轴向锁紧，同时离心叶轮8的径向定位可以使用过盈或者间隙连接。
轴体2上的空腔3的内径需要严格控制，防止轴体与磁性部1的接触面积过小，损坏磁性部1，即D孔≤(1/2)D磁性部1。两个轴体2上空腔3的体积积保持相同，或者通过轴体实心段进行调节使重心靠近整体转子的中心。该电机转子进行分体式加工，通过分别加工第一轴体2a、第二轴体2b和磁性部1，能够有效保证所需要的关键尺寸，简化了加工的复杂性，方便转子检验，提高检验精度。中空结构靠近磁性部1侧可以降低孔的加工精度，能够提高加工效率。
通过上述结构，不仅有效地解决轴承的承载力问题，还能通过减少悬臂端的长度，提高转子的临界转速，进一步提高电机的工作稳定性和可靠性。
本公开使用动压气悬浮轴承，既使得压缩机无需使用润滑油和控制系统，又能使压缩机更加环保和结构更加简单；同时也解决了压缩机转子一体化加工检验困难问题，而且有效提高转子的临界转速，保证轴系工作可靠性与安全性，降低压缩机的维护成本。
以上所述仅为本公开的优选实施例而已，并不用于限制本公开，对于本领域的技 术人员来说，本公开实施例可以有各种更改和变化。凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (12)

  1. 一种电机转子，包括：
    磁性部(1)，用于在通电线圈的作用下转动；以及
    轴体(2)，与所述磁性部(1)连接并沿电机转子的轴向朝远离所述磁性部(1)的方向延伸，所述轴体(2)包括沿其轴向延伸的空腔(3)和用于连接压缩工作部件的连接部(5)，所述连接部(5)和所述空腔(3)间隔设置。
  2. 根据权利要求1所述的电机转子，其中所述空腔(3)由所述轴体(2)的远离所述连接部(5)的一端沿所述电机转子的轴向朝所述连接部(5)延伸。
  3. 根据权利要求1或2所述的电机转子，还包括与所述轴体(2)连接的套筒(4)，所述磁性部(1)套设在所述套筒(4)内。
  4. 根据权利要求3所述的电机转子，其中所述轴体(2)包括：
    第一轴体(2a)，与所述套筒(4)连接，并位于所述磁性部(1)的沿电机转子的轴向的第一端；或
    第二轴体(2b)，与所述套筒(4)连接，并位于所述磁性部(1)的沿电机转子的轴向的第二端。
  5. 根据权利要求4所述的电机转子，其中至少部分所述第一轴体(2a)和至少部分所述第二轴体(2b)套设在所述套筒(4)内。
  6. 根据权利要求4所述的电机转子，其中所述第一轴体(2a)与所述套筒(4)是一体的，至少部分所述第二轴体(2b)套设在所述套筒(4)内。
  7. 根据权利要求3所述的电机转子，还包括用于在所述磁性部(1)套入所述套筒(4)内时排出所述套筒(4)内的气体的第一流道。
  8. 根据权利要求7所述的电机转子，其中所述第一流道包括：
    第一孔道，由所述磁性部(1)的沿所述电机转子的轴向的一端延伸至另一端；或
    第二孔道，设在所述轴体(2)上，并与设在所述轴体(2)上的空腔(3)连通。
  9. 一种压缩机，包括权利要求1至8中任一项所述的电机转子。
  10. 根据权利要求9所述的压缩机，还包括：
    离心叶轮(8)，连接在所述轴体(2)的远离所述磁性部(1)的一端；以及
    扩压器(9)，用于经所述离心叶轮(8)加速后的冷媒在其内压缩。
  11. 根据权利要求9或10所述的压缩机，还包括用于承载所述电机转子气悬浮式轴承。
  12. 一种空调设备，包括权利要求9至11中任一项所述的压缩机。
PCT/CN2019/113911 2018-12-25 2019-10-29 电机转子、压缩机和空调设备 Ceased WO2020134504A1 (zh)

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