WO2020134509A1 - Motor rotor, compressor and air conditioning device - Google Patents
Motor rotor, compressor and air conditioning device Download PDFInfo
- Publication number
- WO2020134509A1 WO2020134509A1 PCT/CN2019/113949 CN2019113949W WO2020134509A1 WO 2020134509 A1 WO2020134509 A1 WO 2020134509A1 CN 2019113949 W CN2019113949 W CN 2019113949W WO 2020134509 A1 WO2020134509 A1 WO 2020134509A1
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- WIPO (PCT)
- Prior art keywords
- shaft body
- cavity
- motor rotor
- sleeve
- magnetic portion
- Prior art date
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Classifications
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- 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
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- 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
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- 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
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
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- 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
- F04D29/058—Bearings magnetic; electromagnetic
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- 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
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- 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
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- 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
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- 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
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- 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
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 related art motor rotor due to heavy weight.
- the present disclosure provides a motor rotor of a compressor, the motor rotor including:
- the shaft body is connected to the magnetic part and extends in a direction away from the magnetic part along the axial direction of the motor rotor.
- the shaft body is provided with a cavity extending along the axial direction.
- the cavity extends from the end of the shaft body away from the magnetic portion to the end of the shaft body adjacent to the magnetic portion;
- the cavity extends from the end of the shaft body away from the magnetic portion toward the magnetic portion and is spaced from the end of the shaft body adjacent to the magnetic portion;
- the cavity includes a first cavity and a second cavity spaced apart from the first cavity.
- the first cavity extends from the end of the shaft body away from the magnetic portion toward the other end of the shaft body, and the second cavity extends from the end of the shaft body adjacent to the magnetic portion toward the other end.
- the shaft body includes a first shaft body provided at a first end of the magnetic portion along the axial direction of the motor rotor, the motor rotor further includes a sleeve connected to the first shaft body, and the magnetic portion is sleeved on the sleeve Inside the tube.
- the motor rotor further includes a first flow channel for exhausting gas in the sleeve when the magnetic portion is sleeved in the sleeve.
- the first flow channel includes:
- the first hole provided on the magnetic part extends from one end of the magnetic part along the axial direction of the motor rotor to the other end.
- the first flow path includes a cavity provided on the first shaft body, the cavity is spaced from the inner cavity of the sleeve, and the first flow path further includes an inner cavity provided on the first shaft body and communicating with the sleeve And the second channel of the cavity.
- the shaft body further includes a second shaft body disposed at a second end of the magnetic portion along the axial direction of the motor rotor, and the second shaft body is at least partially sleeved in the sleeve.
- the motor rotor further includes a second flow passage for exhausting the gas in the sleeve when the second shaft body is sleeved in the sleeve.
- the second flow channel includes:
- a cavity provided on the second shaft body is provided;
- the first shaft body is integrally formed with the sleeve; or
- the first shaft body is at least partially sleeved in the sleeve.
- a compressor including the above-mentioned motor rotor.
- 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.
- FIG. 1 shows a schematic structural diagram of a compressor motor rotor of an embodiment of the present disclosure
- FIG. 2 shows a schematic structural diagram of a compressor motor rotor according to an alternative embodiment of the present disclosure
- FIG. 3 shows an exploded view of a compressor motor rotor of another alternative embodiment of the present disclosure.
- FIG. 4 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.
- the motor rotor of the compressor includes a magnetic portion 1 for rotating under the action of an energized coil, and a shaft connected to the magnetic portion 1 and extending away from the magnetic portion 1 along the axial direction of the motor rotor
- the body 2 is provided with a cavity 3 extending along its axial direction.
- the motor rotor of the compressor of 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 extends from the end of the shaft body 2 away from the magnetic portion 1 to the end of the shaft body 2 adjacent to the magnetic portion 1.
- the cavity includes a first cavity 3 a and a second cavity 3 b spaced apart from the first cavity 3 a.
- a solid shaft body is formed between the first cavity 3a and the second cavity 3b, and the solid shaft body plays a supporting role, which is beneficial to improve the structural strength of the motor rotor.
- the cavity 3 extends from the end of the shaft 2 away from the magnetic portion 1 toward the magnetic portion 1, and is spaced from the end of the shaft 2 adjacent to the magnetic portion 1, the cavity Between 3 and the magnetic part 1 is a solid shaft.
- the shaft body 2 includes a first shaft body 2a provided at the first end of the magnetic portion 1 along the axial direction of the motor rotor.
- the motor rotor further includes a sleeve 4 connected to the first shaft body 2a.
- the magnetic portion 1 is sleeved on the sleeve Inside the tube 4.
- the sleeve 4 is integrally formed with the first shaft body 2a in this embodiment.
- the first shaft body 2a is partially or completely sleeved in the sleeve 4.
- the shaft body 2 further includes a second shaft body 2b provided at the second end of the magnetic portion 1 along the axial direction of the motor rotor.
- the second shaft body 2b is at least partially sleeved in the sleeve 4.
- the motor rotor further includes a first flow path for discharging the gas in the sleeve 4 when the magnetic portion 1 is sleeved in the sleeve 4.
- the first flow path includes a cavity 3 provided on the first shaft body 2a.
- the cavity 3 on the first shaft body 2a extends from one end of the first shaft body 2a adjacent to the magnetic portion 1 to the other end.
- the gas in the sleeve 4 is discharged through the cavity 3 on the first shaft body 2 a.
- the cavity 3 on the first shaft body 2a extends from one end of the first shaft body 2a adjacent to the magnetic portion 1 toward the other end, and the first shaft body 2a is further provided with a cavity for communicating with the shaft body 3
- the through hole in the outer space of 2 extends in the radial direction of the shaft body 2 in some embodiments.
- the cavity 3 described above does not need to extend to the end of the first shaft body 2a adjacent to the magnetic portion 1.
- the gas in the sleeve 4 passes through the first shaft body 2 a
- the upper cavity 3 and the above-mentioned through hole are discharged.
- the motor rotor further includes a second flow path for discharging the gas in the sleeve 4 when the second shaft body 2b is sleeved in the sleeve 4.
- the second flow path includes a cavity 3 provided on the second shaft body 2b.
- 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 gas in the sleeve 4 is discharged through the cavity 3 provided on the second shaft body 2b.
- the cavity 3 extends from one end adjacent to the magnetic portion 1 toward the other end, and the second shaft body 2 b is further provided with a through hole communicating with the external space of the shaft body 2 of the cavity 3.
- the through hole extends in the radial direction of the second shaft body 2.
- the cavity 3 extends from the end of the second shaft body 2b away from the magnetic portion 1 toward the magnetic portion 1, the cavity 3 is spaced from the magnetic portion 1, the cavity 3 and the solid shaft body of the magnetic portion 1 With exhaust vents.
- FIG. 2 shows a schematic structural diagram of a motor rotor of another alternative embodiment.
- the motor rotor of this embodiment includes a first flow channel for exhausting gas in the sleeve 4 when the magnetic portion 1 is thermally sleeved in the sleeve 4
- the first flow channel includes a first hole 5 provided on the magnetic part 1, and the first hole 5 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 can be discharged through the first hole 5 in the magnetic part 1.
- the cavity 3 provided on the first shaft body 2a includes a first cavity 3a and a second cavity 3b spaced apart from the first cavity 3a.
- the rotor of the motor further includes a second flow channel for discharging the gas in the sleeve 4 during the process of sleeve-fitting the second shaft body 2b into the sleeve 4, the second flow channel includes a cavity 3 provided on the second shaft body 2b The cavity 3 extends from one end of the second shaft body 2b adjacent to the magnetic portion 1 to the other end.
- the second shaft body 2b is provided with a through hole for communicating the cavity 3 and the external space of the shaft body 2.
- the cavity 3 on the second shaft body 2b extends from one end adjacent to the magnetic portion 1 toward the other end, and the cavity 3 need not extend to the end of the second shaft body 2b away from the magnetic portion 1.
- FIG. 3 shows a schematic structural view of a motor rotor of another alternative embodiment.
- the motor rotor of this embodiment includes a first flow channel for exhausting gas in the sleeve 4 when the magnetic part 1 is thermally sleeved into the sleeve 4,
- the first flow channel includes a cavity 3 provided on the first shaft body 2a and a second hole 6 for communicating the cavity 3 and the inner cavity of the sleeve 4.
- the cavity 3 on the first shaft body 2a extends from the end of the first shaft body 2a away from the magnetic portion 1 toward the magnetic portion 1.
- the cavity 3 is spaced from the inner cavity of the sleeve 4, and the cavity 3 and
- the solid shaft body between the inner cavities of the sleeve 4 is provided with a second hole 6, and two ends of the second hole 6 communicate with the cavity 3 and the inner cavity of the sleeve 4 respectively.
- the gas in the sleeve 4 is discharged through the second hole 6 and the cavity 3 provided on the first shaft body 2a.
- the second flow path for exhausting gas when the second shaft body 2b is sleeved into the sleeve 4 includes a first hole provided on the magnetic portion 1 and a hollow provided on the first shaft body 2a Cavity 3.
- FIG. 4 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 section includes a centrifugal impeller 8 connected to the end of the motor rotor, a diffuser 9 for compressing the refrigerant accelerated by the centrifugal impeller therein, and a volute 10 that discharges the compressed refrigerant.
- the compressor further includes a mandrel 7.
- the first end of the mandrel 7 is inserted into the cavity on the shaft body 2 and connected to the solid shaft body section of the shaft body 2.
- the centrifugal impeller 8 is fixed on the mandrel 7 The second end.
- 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 compressor rotor 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 the second shaft body 2b are provided with a cavity 3 extending axially.
- 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 structure diagram of the new three-segment hollow high-speed rotor is shown in Figure 2.
- the motor rotor is mainly composed of the first shaft body 2a, the magnetic part 1 and the second shaft body 2b.
- the left and right shaft bodies 2 are processed into a hollow structure, and the middle is The integral magnetic part 1 omits the middle mandrel, which is beneficial to simplify the structure and reduce assembly.
- the first shaft body 2a at the left end is processed into a two-section hollow structure, the left end is a cooling gas channel, and the right end is a hollow sleeve equipped with a magnetic part 1.
- the second shaft body 2b on the right end is processed into a structure similar to the first shaft body 2a; the solid part of the first shaft body 2a on the left end can be disposed away from the magnetic portion 1, and the first hole 5 is processed in the center of the magnetic portion 1, the first A hole can be a light hole or a threaded hole.
- the number of the first holes 5 is reasonably arranged according to the spatial structure.
- the second shaft body 2b at the right end may use the same structure as the first shaft body 2a.
- the hollow structure of the first shaft body 2a and the second shaft body 2b at the left and right ends can also be processed with a full hole or a small hole or threaded hole structure in the solid part, but the diameter of the hole needs to be strictly controlled to prevent the shaft and the magnetic part 1 Is too small to damage the magnetic part 1, that is, D hole ⁇ (1/2) D magnetic part 1.
- the volume of the cavity 3 of the two-stage shaft body 2 is kept the same or different from the volume of the sleeve section, or the solid section of the shaft body 2 is adjusted so that the center of gravity of the motor rotor is close to the center of the overall 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 two-stage shaft body 2 and the center of the magnetic part 1 can be processed with small holes, but the size of the small holes cannot be too large due to the influence of the material of the magnetic part 1. Generally, ⁇ D3 ⁇ 4mm is suitable. Due to the fact that there is no gas in the rotor of the motor rotor during the heat jacket process, it is necessary to add a small hole to exhaust the solid part of the first shaft body 2a or the second shaft body 2b, and the hole diameter is 2 to 3 mm.
- 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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A motor rotor that has an increased critical speed, a compressor and an air conditioning device, the motor rotor comprising: a magnetic portion (1) which is used for rotating under the action of an energized coil; and a shaft body (2) which is connected to the magnetic portion (1) and which extends along the axial direction of the motor rotor away from the magnetic portion (1), wherein the shaft body (2) is provided thereon with a cavity (3) that extends along the axial direction thereof.
Description
本公开是以CN申请号为CN201811593278.9,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。This disclosure is based on the application with CN application number CN201811593278.9 and the application date is December 25, 2018, and claims its priority. The disclosure content of this CN application is hereby incorporated into the present disclosure as a whole.
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。The present disclosure relates to the field of refrigeration equipment, and in particular, to a motor rotor, compressor, and air conditioning equipment.
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***以及复杂的供油油路***,同时在制冷剂与润滑油具有兼容性,需要在***里面增加分离***,这会导致整个***过于复杂和庞大。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. For rolling bearings and oil film bearings, the compressor requires an additional oil lubrication system and a complicated oil supply oil circuit system. At the same time, 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.
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。Due to the high bearing capacity of rolling bearings and oil film bearings, 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. When the larger rotor is manufactured by the integrated structure, the processing process is relatively complicated, and the equipment requirements are relatively high, which will increase the cost.
因此,为了解决压缩机复杂油路***,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***和分离***,却增加了更加复杂的控制***,由于磁悬浮轴承需要稳定的电源,为防止***突然断电,需要增加保护***,这导致整个压缩机维护成本增加,结构更加复杂化。Therefore, in order to solve the complicated oil circuit system of the compressor, oil-free and environmentally friendly magnetic suspension bearings have appeared. For the magnetic levitation bearing, the oil supply system and the separation system are omitted, but a more complicated control system is added. Since the magnetic levitation bearing needs a stable power supply, in order to prevent the system from being suddenly powered off, a protection system needs to be added, which leads to the entire compressor maintenance cost Increased, the structure is more complicated.
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。In order to solve the problem of the critical speed of the rotor of the compressor, 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. However, 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.
公开内容Public content
本公开旨在提供一种电机转子、压缩机和空调设备,以改善相关技术的电机转子因重量较大而导致的临界转速低的问题。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 related art motor rotor due to heavy weight.
根据本公开的实施例的一个方面,本公开提供了一种压缩机的电机转子,电机转 子包括:According to an aspect of an embodiment of the present disclosure, the present disclosure provides a motor rotor of a compressor, the motor rotor including:
磁性部,用于在通电线圈的作用下转动;以及Magnetic part for rotation under the action of energized coil; and
轴体,与磁性部连接并沿电机转子的轴向朝远离磁性部的方向延伸,轴体上设置有沿其轴向延伸的空腔。The shaft body is connected to the magnetic part and extends in a direction away from the magnetic part along the axial direction of the motor rotor. The shaft body is provided with a cavity extending along the axial direction.
在一些实施例中,In some embodiments,
空腔由轴体的远离磁性部的一端延伸至轴体的邻近磁性部的一端;或The cavity extends from the end of the shaft body away from the magnetic portion to the end of the shaft body adjacent to the magnetic portion; or
空腔由轴体的远离磁性部的一端朝磁性部延伸,并与轴体的邻近磁性部的一端相间隔;或The cavity extends from the end of the shaft body away from the magnetic portion toward the magnetic portion and is spaced from the end of the shaft body adjacent to the magnetic portion; or
空腔包括第一空腔和与第一空腔间隔设置的第二空腔。The cavity includes a first cavity and a second cavity spaced apart from the first cavity.
在一些实施例中,第一空腔由轴体的远离磁性部的一端朝轴体的另一端延伸,第二空腔由轴体的邻近磁性部的一端朝另一端延伸。In some embodiments, the first cavity extends from the end of the shaft body away from the magnetic portion toward the other end of the shaft body, and the second cavity extends from the end of the shaft body adjacent to the magnetic portion toward the other end.
在一些实施例中,轴体包括设在磁性部的沿电机转子的轴向的第一端的第一轴体,电机转子还包括与第一轴体连接的套筒,磁性部套设在套筒内。In some embodiments, the shaft body includes a first shaft body provided at a first end of the magnetic portion along the axial direction of the motor rotor, the motor rotor further includes a sleeve connected to the first shaft body, and the magnetic portion is sleeved on the sleeve Inside the tube.
在一些实施例中,电机转子还包括用于在磁性部套装入套筒内时排出套筒内的气体的第一流道。In some embodiments, the motor rotor further includes a first flow channel for exhausting gas in the sleeve when the magnetic portion is sleeved in the sleeve.
在一些实施例中,第一流道包括:In some embodiments, the first flow channel includes:
设在第一轴体上的空腔;和/或A cavity provided on the first shaft body; and/or
设在磁性部上的第一孔道,由磁性部的沿电机转子轴向的一端延伸至另一端。The first hole provided on the magnetic part extends from one end of the magnetic part along the axial direction of the motor rotor to the other end.
在一些实施例中,第一流道包括设在第一轴体上的空腔,空腔与套筒的内腔间隔设置,第一流道还包括设第一轴体上且连通套筒的内腔和空腔的第二孔道。In some embodiments, the first flow path includes a cavity provided on the first shaft body, the cavity is spaced from the inner cavity of the sleeve, and the first flow path further includes an inner cavity provided on the first shaft body and communicating with the sleeve And the second channel of the cavity.
在一些实施例中,轴体还包括设在磁性部沿电机转子的轴向的第二端的第二轴体,第二轴体至少部分套设在套筒内。In some embodiments, the shaft body further includes a second shaft body disposed at a second end of the magnetic portion along the axial direction of the motor rotor, and the second shaft body is at least partially sleeved in the sleeve.
在一些实施例中,电机转子还包括用于在第二轴体套装入套筒内时排出套筒内的气体的第二流道。In some embodiments, the motor rotor further includes a second flow passage for exhausting the gas in the sleeve when the second shaft body is sleeved in the sleeve.
在一些实施例中,第二流道包括:In some embodiments, the second flow channel includes:
设在第二轴体上的空腔;和/或A cavity provided on the second shaft body; and/or
设置在磁性部上的第一孔道和设在第一轴体上的空腔。A first hole provided on the magnetic part and a cavity provided on the first shaft body.
在一些实施例中,In some embodiments,
第一轴体与套筒一体成型;或The first shaft body is integrally formed with the sleeve; or
第一轴体至少部分套设在套筒内。The first shaft body is at least partially sleeved in the sleeve.
根据本公开的另一方面,还提供了一种压缩机,压缩机包括上述的电机转子。According to another aspect of the present disclosure, there is also provided a compressor including the above-mentioned motor rotor.
在一些实施例中,压缩机还包括:In some embodiments, the compressor further includes:
离心叶轮,连接在轴体的远离磁性部的一端;以及Centrifugal impeller connected to the end of the shaft body away from the magnetic part; and
扩压器,用于经离心叶轮加速后的冷媒在其内压缩。The diffuser is used to compress the refrigerant accelerated by the centrifugal impeller.
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。In some embodiments, the compressor further includes an air suspension bearing for carrying the rotor of the motor.
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。According to another aspect of the present disclosure, there is also provided an air conditioner including the compressor described above.
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。Applying the technical solution of the present disclosure, 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.
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:The drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure, and do not constitute an undue limitation on the present disclosure. In the drawings:
图1示出了本公开的实施例的压缩机电机转子的结构示意图;FIG. 1 shows a schematic structural diagram of a compressor motor rotor of an embodiment of the present disclosure;
图2示出了本公开的一个可选实施例的压缩机电机转子的结构示意图;2 shows a schematic structural diagram of a compressor motor rotor according to an alternative embodiment of the present disclosure;
图3示出了本公开的另一个可选实施例的压缩机电机转子的***图;以及3 shows an exploded view of a compressor motor rotor of another alternative embodiment of the present disclosure; and
图4示出了本公开的实施例的压缩机的结构示意图。FIG. 4 shows a schematic structural diagram of a compressor of an embodiment of the present disclosure.
图中:In the picture:
1、磁性部;2、轴体;3、空腔;4、套筒;5、第一孔道;6、第二孔道;7、芯轴;8、离心叶轮;9、扩压器;10、蜗壳;11、轴承支座;12、轴承。1. Magnetic part; 2. Shaft body; 3. Cavity; 4. Sleeve; 5. First hole; 6. Second hole; 7. Mandrel; 8. Centrifugal impeller; 9. Diffuser; 10. Volute; 11, bearing support; 12, bearing.
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。In order to make the purpose, technical solutions and advantages of the disclosure more clear, the disclosure will be further described in detail in conjunction with the embodiments and the drawings. Here, the exemplary embodiments of the present disclosure and the description thereof are used to explain the present disclosure, but are not intended to limit the present disclosure.
图1示出了本实施例的压缩机的电机转子的结构示意图。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上设置有沿其轴向延伸的空腔3。FIG. 1 shows a schematic structural diagram of a motor rotor of the compressor of this embodiment. As shown in FIG. 1, in this embodiment, the motor rotor of the compressor includes a magnetic portion 1 for rotating under the action of an energized coil, and a shaft connected to the magnetic portion 1 and extending away from the magnetic portion 1 along the axial direction of the motor rotor The body 2 is provided with a cavity 3 extending along its axial direction.
本实施例的压缩机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。The motor rotor of the compressor of 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.
在本实施例中,空腔3由轴体2的远离磁性部1的一端延伸至轴体2的邻近磁性部1的一端。In this embodiment, the cavity 3 extends from the end of the shaft body 2 away from the magnetic portion 1 to the end of the shaft body 2 adjacent to the magnetic portion 1.
如图2所示,在另一实施例中,空腔包括第一空腔3a和与第一空腔3a间隔设置的第二空腔3b。第一空腔3a和第二空腔3b之间为实心轴体,实心轴体起到支撑作用,有利于提高电机转子的结构强度。As shown in FIG. 2, in another embodiment, the cavity includes a first cavity 3 a and a second cavity 3 b spaced apart from the first cavity 3 a. A solid shaft body is formed between the first cavity 3a and the second cavity 3b, and the solid shaft body plays a supporting role, which is beneficial to improve the structural strength of the motor rotor.
如图3所示,在另一实施例中,空腔3由轴体2的远离磁性部1的一端朝磁性部1延伸,并与轴体2的邻近磁性部1的一端相间隔,空腔3与磁性部1之间为实心轴体。As shown in FIG. 3, in another embodiment, the cavity 3 extends from the end of the shaft 2 away from the magnetic portion 1 toward the magnetic portion 1, and is spaced from the end of the shaft 2 adjacent to the magnetic portion 1, the cavity Between 3 and the magnetic part 1 is a solid shaft.
轴体2包括设在磁性部1的沿电机转子的轴向的第一端的第一轴体2a,电机转子还包括与第一轴体2a连接的套筒4,磁性部1套设在套筒4内。The shaft body 2 includes a first shaft body 2a provided at the first end of the magnetic portion 1 along the axial direction of the motor rotor. The motor rotor further includes a sleeve 4 connected to the first shaft body 2a. The magnetic portion 1 is sleeved on the sleeve Inside the tube 4.
在本实施例中,本实施例中套筒4与第一轴体2a一体成型。在另一些可选的实施例中,第一轴体2a部分或全部套设在套筒4中。In this embodiment, the sleeve 4 is integrally formed with the first shaft body 2a in this embodiment. In other optional embodiments, the first shaft body 2a is partially or completely sleeved in the sleeve 4.
轴体2还包括设在磁性部1的沿电机转子的轴向的第二端的第二轴体2b,第二轴体2b至少部分套设在套筒4内。The shaft body 2 further includes a second shaft body 2b provided at the second end of the magnetic portion 1 along the axial direction of the motor rotor. The second shaft body 2b is at least partially sleeved in the sleeve 4.
电机转子还包括用于在磁性部1套入套筒4内时排出套筒4内的气体的第一流道。The motor rotor further includes a first flow path for discharging the gas in the sleeve 4 when the magnetic portion 1 is sleeved in the sleeve 4.
第一流道包括设在第一轴体2a上的空腔3。第一轴体2a上的空腔3由第一轴体2a邻近磁性部1的一端延伸至另一端。在将磁性部1热套在套筒4内的过程中,套筒4内的气体经第一轴体2a上的空腔3排出。The first flow path includes a cavity 3 provided on the first shaft body 2a. The cavity 3 on the first shaft body 2a extends from one end of the first shaft body 2a adjacent to the magnetic portion 1 to the other end. In the process of thermally sheathing the magnetic part 1 in the sleeve 4, the gas in the sleeve 4 is discharged through the cavity 3 on the first shaft body 2 a.
在一些实施例中,第一轴体2a上的空腔3由第一轴体2a邻近磁性部1的一端朝另一端延伸,第一轴体2a上还设有用于连通空腔3和轴体2的外部空间的通孔,在一些实施例中通孔沿轴体2的径向延伸。上述的空腔3可不必延伸至第一轴体2a的邻近磁性部1的一端,在将磁性部1热套在套筒4内的过程中,套筒4内的气体经第一轴体2a上的空腔3和上述的通孔排出。In some embodiments, the cavity 3 on the first shaft body 2a extends from one end of the first shaft body 2a adjacent to the magnetic portion 1 toward the other end, and the first shaft body 2a is further provided with a cavity for communicating with the shaft body 3 The through hole in the outer space of 2 extends in the radial direction of the shaft body 2 in some embodiments. The cavity 3 described above does not need to extend to the end of the first shaft body 2a adjacent to the magnetic portion 1. During the process of thermally sheathing the magnetic portion 1 in the sleeve 4, the gas in the sleeve 4 passes through the first shaft body 2 a The upper cavity 3 and the above-mentioned through hole are discharged.
电机转子还包括用于在第二轴体2b套装入套筒4内时排出套筒4内的气体的第二流道。The motor rotor further includes a second flow path for discharging the gas in the sleeve 4 when the second shaft body 2b is sleeved in the sleeve 4.
第二流道包括设在第二轴体2b上的空腔3。第二轴体2b上的空腔3由第二轴体2b的邻近磁性部1的一端延伸朝另一端延伸。在将第二轴体2b热套在套筒4内的过程中,套筒4内的气体经设在第二轴体2b上的空腔3排出。The second flow path includes a cavity 3 provided on the second shaft body 2b. 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. In the process of thermally sheathing the second shaft body 2b in the sleeve 4, the gas in the sleeve 4 is discharged through the cavity 3 provided on the second shaft body 2b.
在一些实施例中,空腔3由邻近磁性部1的一端朝另一端延伸,第二轴体2b上还设有连通空腔3的轴体2的外部空间的通孔。在一些实施例中,该通孔沿第二轴体 2的径向延伸。在将第二轴体2b热套在套筒4内的过程中,套筒4内的气体经设在第二轴体2b上的空腔3和通孔排出。In some embodiments, the cavity 3 extends from one end adjacent to the magnetic portion 1 toward the other end, and the second shaft body 2 b is further provided with a through hole communicating with the external space of the shaft body 2 of the cavity 3. In some embodiments, the through hole extends in the radial direction of the second shaft body 2. In the process of thermally sheathing the second shaft body 2b in the sleeve 4, the gas in the sleeve 4 is discharged through the cavity 3 and the through hole provided in the second shaft body 2b.
在一些实施例中,空腔3由第二轴体2b的远离磁性部1的一端朝磁性部1延伸,空腔3与磁性部1相间隔,空腔3和磁性部1的实心轴体上设有排气孔道。In some embodiments, the cavity 3 extends from the end of the second shaft body 2b away from the magnetic portion 1 toward the magnetic portion 1, the cavity 3 is spaced from the magnetic portion 1, the cavity 3 and the solid shaft body of the magnetic portion 1 With exhaust vents.
图2示出了另一可选实施例的电机转子的结构示意图,该实施例的电机转子包括用于在将磁性部1热套入套筒4时排出套筒4内的气体的第一流道,第一流道包括设在磁性部1上的第一孔道5,第一孔道5由磁性部1的沿电机转子轴向的一端延伸至另一端。在将磁性部1热套入套筒4内的过程中,套筒4内的气体可经磁性部1上的第一孔道5排出。FIG. 2 shows a schematic structural diagram of a motor rotor of another alternative embodiment. The motor rotor of this embodiment includes a first flow channel for exhausting gas in the sleeve 4 when the magnetic portion 1 is thermally sleeved in the sleeve 4 The first flow channel includes a first hole 5 provided on the magnetic part 1, and the first hole 5 extends from one end of the magnetic part 1 along the axial direction of the motor rotor to the other end. In the process of thermally sheathing the magnetic part 1 into the sleeve 4, the gas in the sleeve 4 can be discharged through the first hole 5 in the magnetic part 1.
如图2所示,设在第一轴体2a上的空腔3包括第一空腔3a和与第一空腔3a间隔设置的第二空腔3b。As shown in FIG. 2, the cavity 3 provided on the first shaft body 2a includes a first cavity 3a and a second cavity 3b spaced apart from the first cavity 3a.
电机转子还包括用于在将第二轴体2b套入套筒4的过程中排出套筒4内气体的第二流道,第二流道包括设在第二轴体2b上的空腔3,该空腔3由第二轴体2b的邻近磁性部1的一端延伸至另一端。The rotor of the motor further includes a second flow channel for discharging the gas in the sleeve 4 during the process of sleeve-fitting the second shaft body 2b into the sleeve 4, the second flow channel includes a cavity 3 provided on the second shaft body 2b The cavity 3 extends from one end of the second shaft body 2b adjacent to the magnetic portion 1 to the other end.
在一些实施例中,第二轴体2b上设置有用于连通空腔3和轴体2的外部空间的通孔。第二轴体2b上的空腔3由邻近磁性部1的一端朝另一端延伸,空腔3可不必延伸至第二轴体2b的远离磁性部1的一端。In some embodiments, the second shaft body 2b is provided with a through hole for communicating the cavity 3 and the external space of the shaft body 2. The cavity 3 on the second shaft body 2b extends from one end adjacent to the magnetic portion 1 toward the other end, and the cavity 3 need not extend to the end of the second shaft body 2b away from the magnetic portion 1.
图3示出另一可选实施例的电机转子的结构示意图,该实施例的电机转子包括用于在将磁性部1热套入套筒4时排出套筒4内的气体的第一流道,第一流道包括设在第一轴体2a上的空腔3和用于连通该空腔3和套筒4的内腔的第二孔道6。FIG. 3 shows a schematic structural view of a motor rotor of another alternative embodiment. The motor rotor of this embodiment includes a first flow channel for exhausting gas in the sleeve 4 when the magnetic part 1 is thermally sleeved into the sleeve 4, The first flow channel includes a cavity 3 provided on the first shaft body 2a and a second hole 6 for communicating the cavity 3 and the inner cavity of the sleeve 4.
本实施例中第一轴体2a上的空腔3由第一轴体2a的远离磁性部1的一端朝磁性部1延伸,空腔3与套筒4的内腔相间隔,空腔3和套筒4的内腔之间的实心轴体上设有第二孔道6,第二孔道6的两端分别与空腔3和套筒4的内腔连通。In this embodiment, the cavity 3 on the first shaft body 2a extends from the end of the first shaft body 2a away from the magnetic portion 1 toward the magnetic portion 1. The cavity 3 is spaced from the inner cavity of the sleeve 4, and the cavity 3 and The solid shaft body between the inner cavities of the sleeve 4 is provided with a second hole 6, and two ends of the second hole 6 communicate with the cavity 3 and the inner cavity of the sleeve 4 respectively.
在将磁性部1套入套筒4内的过程中,套筒4内气体经第二孔道6和设在第一轴体2a上的空腔3排出。In the process of fitting the magnetic part 1 into the sleeve 4, the gas in the sleeve 4 is discharged through the second hole 6 and the cavity 3 provided on the first shaft body 2a.
在一些实施例中,用于在将第二轴体2b套入套筒4时排出气体的第二流道包括设在磁性部1上的第一孔道和设在第一轴体2a上的空腔3。In some embodiments, the second flow path for exhausting gas when the second shaft body 2b is sleeved into the sleeve 4 includes a first hole provided on the magnetic portion 1 and a hollow provided on the first shaft body 2a Cavity 3.
根据本公开的另一方面还提供了一种压缩机,图4示出了本实施例的压缩机的结构示意图。如图4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。According to another aspect of the present disclosure, a compressor is also provided. FIG. 4 shows a schematic structural diagram of the compressor of this embodiment. As shown in FIG. 4, 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.
压缩机还包括有电机转子驱动的离心压缩部。离心压缩部包括连接电机转子的端部的离心叶轮8、用于经离心叶轮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。The compressor also includes a centrifugal compression section driven by a motor rotor. The centrifugal compression section includes a centrifugal impeller 8 connected to the end of the motor rotor, a diffuser 9 for compressing the refrigerant accelerated by the centrifugal impeller therein, and a volute 10 that discharges the compressed refrigerant.
如图4所示,压缩机还包括芯轴7,芯轴7的第一端***到轴体2上空腔中,并与轴体2的实心轴体段连接,离心叶轮8固定在芯轴7的第二端。As shown in FIG. 4, the compressor further includes a mandrel 7. The first end of the mandrel 7 is inserted into the cavity on the shaft body 2 and connected to the solid shaft body section of the shaft body 2. The centrifugal impeller 8 is fixed on the mandrel 7 The second end.
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。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.
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。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. Preferably, the air suspension bearing is a dynamic pressure air suspension bearing.
结合图1至4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。With reference to FIGS. 1 to 4, the compressor rotor 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 the second shaft body 2b are provided with a cavity 3 extending axially. The overall quality of the motor rotor is reduced, thereby increasing the rotor's critical speed and increasing the bearing capacity of the bearing.
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***。循环供气自冷却***为压缩机腔体内的轴承12提供用于降温和/或润滑的冷媒。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.
压缩机的电机转子***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。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.
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。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.
新型三段中空高速转子结构示意图如图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。左端的第一轴体2a加工成两段空心式结构,左端为冷却气体通道,右端为装配磁性部1的空心套筒。或者将右端的第二轴体2b加工成类似于第一轴体2a结构;左端第一轴体2a实心部分可以设置在远离磁性部1位置,在磁性部1中心加工出第一孔道5,第一孔道可以光孔或者是螺纹 孔。第一孔道5数量根据空间结构合理布置。类似的,右端的第二轴体2b可以使用与第一轴体2a相同结构。左右两端第一轴体2a和第二轴体2b的中空结构也可以加工全孔或者在实心部分加工成小孔、螺纹孔结构,但是对孔的直径需要严格控制,防止轴与磁性部1的接触面积过小,损坏磁性部1,即D孔≤(1/2)D磁性部1。两段轴体2的空腔3的体积保持相同或者相差套筒段体积的量,或者通过轴体2的实心段进行调节使电机转子的重心靠近整体转子的中心。The structure diagram of the new three-segment hollow high-speed rotor is shown in Figure 2. The motor rotor is mainly composed of the first shaft body 2a, the magnetic part 1 and the second shaft body 2b. The left and right shaft bodies 2 are processed into a hollow structure, and the middle is The integral magnetic part 1 omits the middle mandrel, which is beneficial to simplify the structure and reduce assembly. The first shaft body 2a at the left end is processed into a two-section hollow structure, the left end is a cooling gas channel, and the right end is a hollow sleeve equipped with a magnetic part 1. Or the second shaft body 2b on the right end is processed into a structure similar to the first shaft body 2a; the solid part of the first shaft body 2a on the left end can be disposed away from the magnetic portion 1, and the first hole 5 is processed in the center of the magnetic portion 1, the first A hole can be a light hole or a threaded hole. The number of the first holes 5 is reasonably arranged according to the spatial structure. Similarly, the second shaft body 2b at the right end may use the same structure as the first shaft body 2a. The hollow structure of the first shaft body 2a and the second shaft body 2b at the left and right ends can also be processed with a full hole or a small hole or threaded hole structure in the solid part, but the diameter of the hole needs to be strictly controlled to prevent the shaft and the magnetic part 1 Is too small to damage the magnetic part 1, that is, D hole ≤ (1/2) D magnetic part 1. The volume of the cavity 3 of the two-stage shaft body 2 is kept the same or different from the volume of the sleeve section, or the solid section of the shaft body 2 is adjusted so that the center of gravity of the motor rotor is close to the center of the overall rotor.
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。两段轴体2和磁性部1中心可以加工出小孔,但是受到磁性部1材料影响,小孔的大小不能太大,一般以φD3≤4mm为宜。由于电机转子在热套过程中存在气体无法排除,需要在第一轴体2a或第二轴体2b的实心部分增加小孔排气,孔径为2至3mm。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 two-stage shaft body 2 and the center of the magnetic part 1 can be processed with small holes, but the size of the small holes cannot be too large due to the influence of the material of the magnetic part 1. Generally, φD3≤4mm is suitable. Due to the fact that there is no gas in the rotor of the motor rotor during the heat jacket process, it is necessary to add a small hole to exhaust the solid part of the first shaft body 2a or the second shaft body 2b, and the hole diameter is 2 to 3 mm.
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。Through the above structure, not only the bearing capacity problem is effectively solved, but also the critical rotation speed of the rotor is increased by reducing the length of the cantilever end, and the working stability and reliability of the motor are further improved.
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***,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。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. The above is only the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. For those skilled in the art, the embodiments of the present disclosure may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of this disclosure shall be included in the protection scope of this disclosure.
Claims (15)
- 一种电机转子,包括:A motor rotor, including:磁性部(1),用于在通电线圈的作用下转动;以及The magnetic part (1) is used to rotate under the action of the energized coil; and轴体(2),与所述磁性部(1)连接并沿所述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)上设置有沿其轴向延伸的空腔(3)。A shaft body (2) is connected to the magnetic part (1) and extends in a direction away from the magnetic part (1) along the axial direction of the motor rotor. The shaft body (2) is provided with a shaft Toward the cavity (3).
- 根据权利要求1所述的电机转子,其中,The motor rotor according to claim 1, wherein所述空腔(3)由所述轴体(2)的远离所述磁性部(1)的一端延伸至所述轴体(2)的邻近所述磁性部(1)的一端;或The cavity (3) extends from an end of the shaft body (2) away from the magnetic portion (1) to an end of the shaft body (2) adjacent to the magnetic portion (1); or所述空腔(3)由所述轴体(2)的远离所述磁性部(1)的一端朝所述磁性部(1)延伸,并与所述轴体(2)的邻近所述磁性部(1)的一端相间隔;或The cavity (3) extends from the end of the shaft body (2) away from the magnetic portion (1) toward the magnetic portion (1) and is adjacent to the magnetic body of the shaft body (2) At one end of part (1); or所述空腔(3)包括第一空腔(3a)和与所述第一空腔(3a)间隔设置的第二空腔(3b)。The cavity (3) includes a first cavity (3a) and a second cavity (3b) spaced apart from the first cavity (3a).
- 根据权利要求2所述的电机转子,其中所述第一空腔(3a)由所述轴体(2)的远离所述磁性部(1)的一端朝邻近所述磁性部(1)的一端延伸,所述第二空腔(3b)由所述轴体(2)的邻近所述磁性部(1)的一端朝远离所述磁性部(1)的一端延伸。The motor rotor according to claim 2, wherein the first cavity (3a) is directed from an end of the shaft body (2) away from the magnetic portion (1) toward an end adjacent to the magnetic portion (1) The second cavity (3b) extends from an end of the shaft body (2) adjacent to the magnetic portion (1) toward an end away from the magnetic portion (1).
- 根据权利要求1至3中任一项所述的电机转子,其中所述轴体(2)包括设在所述磁性部(1)的沿所述电机转子的轴向的第一端的第一轴体(2a),所述电机转子还包括与所述第一轴体(2a)连接的套筒(4),所述磁性部(1)套设在所述套筒(4)内。The motor rotor according to any one of claims 1 to 3, wherein the shaft body (2) includes a first provided at a first end of the magnetic portion (1) along the axial direction of the motor rotor A shaft body (2a), the motor rotor further includes a sleeve (4) connected to the first shaft body (2a), and the magnetic portion (1) is sleeved in the sleeve (4).
- 根据权利要求4所述的电机转子,还包括用于在所述磁性部(1)套装入所述套筒(4)内时排出所述套筒(4)内的气体的第一流道。The motor rotor according to claim 4, further comprising a first flow path for discharging the gas in the sleeve (4) when the magnetic portion (1) is fitted in the sleeve (4).
- 根据权利要求5所述的电机转子,其中所述第一流道包括:The motor rotor according to claim 5, wherein the first flow path includes:设在所述第一轴体(2a)上的所述空腔(3);或The cavity (3) provided on the first shaft body (2a); or设在所述磁性部(1)上的第一孔道(5),由所述磁性部(1)的沿所述电机转 子轴向的一端延伸至另一端。A first hole (5) provided in the magnetic part (1) extends from one end of the magnetic part (1) along the axial direction of the motor rotor to the other end.
- 根据权利要求5所述的电机转子,其中所述第一流道包括设在所述第一轴体(2a)上的空腔(3),所述空腔(3)与所述套筒(4)的内腔间隔设置,所述第一流道还包括设所述第一轴体(2a)上且连通所述套筒的内腔和所述空腔(3)的第二孔道(6)。The motor rotor according to claim 5, wherein the first flow path includes a cavity (3) provided on the first shaft body (2a), the cavity (3) and the sleeve (4 ), the first flow channel further includes a second hole (6) provided on the first shaft body (2a) and communicating the inner cavity of the sleeve and the cavity (3).
- 根据权利要求4所述的电机转子,其中所述轴体(2)还包括设在所述磁性部(1)沿所述电机转子的轴向的第二端的第二轴体(2b),所述第二轴体(2b)至少部分套设在所述套筒(4)内。The motor rotor according to claim 4, wherein the shaft body (2) further includes a second shaft body (2b) provided at a second end of the magnetic portion (1) along the axial direction of the motor rotor, so The second shaft body (2b) is at least partially sleeved in the sleeve (4).
- 根据权利要求8所述的电机转子,还包括用于在所述第二轴体(2b)套装入所述套筒(4)内时排出所述套筒(4)内的气体的第二流道。The motor rotor according to claim 8, further comprising a second flow for exhausting the gas in the sleeve (4) when the second shaft body (2b) is sleeved in the sleeve (4) Road.
- 根据权利要求9所述的电机转子,其中所述第二流道包括:The motor rotor according to claim 9, wherein the second flow path includes:设在所述第二轴体(2b)上的所述空腔;或The cavity provided on the second shaft body (2b); or设置在所述磁性部(1)上的第一孔道(5)和设在所述第一轴体(2a)上的空腔(3)。A first hole (5) provided on the magnetic part (1) and a cavity (3) provided on the first shaft body (2a).
- 根据权利要求4所述的电机转子,其中,The motor rotor according to claim 4, wherein:所述第一轴体(2a)与所述套筒(4)一体成型;或The first shaft body (2a) and the sleeve (4) are integrally formed; or所述第一轴体(2a)至少部分套设在所述套筒(4)内。The first shaft body (2a) is at least partially sleeved in the sleeve (4).
- 一种压缩机,包括权利要求1至11中任一项所述的电机转子。A compressor comprising the motor rotor according to any one of claims 1 to 11.
- 根据权利要求12所述的压缩机,其中所述压缩机还包括:The compressor of claim 12, wherein the compressor further comprises: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A centrifugal impeller (8) connected to the end of the shaft body (2) away from the magnetic part (1); and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。A diffuser (9) is used for compressing the refrigerant accelerated by the centrifugal impeller (8) therein.
- 根据权利要求12或13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。The compressor according to claim 12 or 13, further comprising an air suspension bearing for carrying the rotor of the motor.
- 一种空调设备,包括权利要求12至14中任一项所述的压缩机。An air-conditioning apparatus including the compressor according to any one of claims 12 to 14.
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