CN111371211A - Motor rotor for improving critical rotating speed, compressor and air conditioning equipment - Google Patents

Motor rotor for improving critical rotating speed, compressor and air conditioning equipment Download PDF

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Publication number
CN111371211A
CN111371211A CN201811593278.9A CN201811593278A CN111371211A CN 111371211 A CN111371211 A CN 111371211A CN 201811593278 A CN201811593278 A CN 201811593278A CN 111371211 A CN111371211 A CN 111371211A
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CN
China
Prior art keywords
shaft body
cavity
magnetic part
sleeve
motor rotor
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.)
Pending
Application number
CN201811593278.9A
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Chinese (zh)
Inventor
刘华
张治平
叶文腾
李宏波
陈玉辉
钟瑞兴
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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Publication date
Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN201811593278.9A priority Critical patent/CN111371211A/en
Priority to PCT/CN2019/113949 priority patent/WO2020134509A1/en
Publication of CN111371211A publication Critical patent/CN111371211A/en
Pending legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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

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

Abstract

The invention relates to a motor rotor, a compressor and an air conditioning device for improving critical rotating speed, wherein the motor rotor comprises: a magnetic part (1) which is used for rotating under the action of the electrified coil; and the shaft body (2) is connected with the magnetic part (1) and extends away from the magnetic part (1) along the axial direction of the motor rotor, and a cavity (3) extending along the axial direction of the shaft body (2) is arranged on the shaft body. By the technical scheme, the cavity is formed in the shaft body of the motor rotor, and the problem that the critical rotating speed of the motor rotor is low due to the fact that the weight of the motor rotor is large in the prior art is solved.

Description

Motor rotor for improving critical rotating speed, compressor and air conditioning equipment
Technical Field
The invention relates to the field of refrigeration equipment, in particular to a motor rotor, a compressor and air conditioning equipment.
Background
Centrifugal refrigeration compressors belong to the high speed type of compressors, the compressor rotor rotates at high speed during operation, and reliable bearings are required to support the rotor. The bearings used by the conventional rotor mainly comprise a rolling bearing, an oil film bearing and a magnetic suspension bearing. For rolling bearings and oil film bearings, the compressor needs an additional oil lubrication system and a complex oil supply system, and meanwhile, the refrigerant and the lubricating oil have compatibility, and a separation system needs to be added in the system, so that the whole system is too complex and large.
Because the bearing capacity of the rolling bearing and the oil film bearing is high, the motor rotor used by the conventional centrifugal compressor is of an integrated structure, and the weight of the compressor rotor of the structure is relatively heavy, so that the promotion of the critical rotating speed of the rotor is not facilitated. When the integral structure is used for manufacturing a large rotor, the machining process is relatively complicated, the requirement on equipment is relatively high, and the cost is increased.
Therefore, in order to solve the problem of a complex oil circuit system of the compressor, an oil-free environment-friendly magnetic suspension bearing is provided. For the magnetic suspension bearing, an oil supply system and a separation system are omitted, but a more complex control system is added, and because the magnetic suspension bearing needs a stable power supply, a protection system needs to be added for preventing the system from being suddenly powered off, the maintenance cost of the whole compressor is increased, and the structure is more complex.
In order to solve the problem of the critical rotating speed of the rotor of the compressor, the conventional compressor mainly increases the critical rotating speed of the rotor by reducing the length of the rotor or increasing the rigidity of a bearing. However, the length direction of the rotor is reduced, and the optimization degree is relatively less due to the influence of the size and the dimension of each part. The rigidity of the bearing is improved, and the volume of the bearing needs to be increased under high rotating speed, so that the whole compressor is enlarged, and the development trend of miniaturization is violated.
Disclosure of Invention
The invention aims to provide a motor rotor, a compressor and air conditioning equipment, which aim to solve the problem of low critical rotating speed of the motor rotor in the prior art due to large weight.
According to an aspect of an embodiment of the present invention, there is provided a motor rotor of a compressor, the motor rotor including:
the magnetic part is used for rotating under the action of the electrified coil; and
the axis body is connected with magnetism portion and keeps away from magnetism portion extension along electric motor rotor's axial, is provided with the cavity of following its axial extension on the axis body.
Alternatively,
the cavity extends from one end of the shaft body far away from the magnetic part to one end of the shaft body close to the magnetic part; or
The cavity extends from one end of the shaft body far away from the magnetic part to the magnetic part and is separated from one end of the shaft body close to the magnetic part; or
The cavity comprises a first cavity and a second cavity arranged at a distance from the first cavity.
Optionally, the first cavity extends from one end of the shaft body far away from the magnetic part towards the other end of the shaft body, and the second cavity extends from one end of the shaft body near the magnetic part towards the other end.
Optionally, the shaft body includes a first shaft body disposed at a first end of the magnetic portion along an axial direction of the motor rotor, the motor rotor further includes a sleeve connected to the first shaft body, and the magnetic portion is disposed in the sleeve.
Optionally, the electric machine rotor further comprises a first flow passage for discharging gas inside the sleeve when the magnetic part is fitted inside the sleeve.
Optionally, the first flow channel comprises:
a cavity disposed on the first shaft; and/or
The first pore canal is arranged on the magnetic part and extends from one end of the magnetic part along the axial direction of the motor rotor to the other end.
Optionally, the first flow channel includes a cavity formed in the first shaft, the cavity is spaced from the inner cavity of the sleeve, and the first flow channel further includes a second hole formed in the first shaft and communicating the inner cavity of the sleeve with the cavity.
Optionally, 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.
Optionally, the electric machine rotor further comprises a second flow passage for discharging gas in the sleeve when the second shaft body is sleeved in the sleeve.
Optionally, the second flow channel comprises:
a cavity arranged on the second shaft body; and/or
A first hole channel arranged on the magnetic part and a cavity arranged on the first shaft body.
Alternatively,
the first shaft body and the sleeve are integrally formed; or
The first shaft body is at least partially sleeved in the sleeve.
According to another aspect of the present application, there is also provided a compressor including the motor rotor described above.
Optionally, the compressor further comprises:
the centrifugal impeller is connected to one end, far away from the magnetic part, of the shaft body; and
and the diffuser is used for compressing the refrigerant accelerated by the centrifugal impeller in the diffuser.
Optionally, the compressor further comprises an air suspension bearing for carrying the rotor of the electric motor.
According to another aspect of the present application, there is also provided an air conditioning apparatus including the compressor described above.
By the technical scheme, the cavity is formed in the shaft body of the motor rotor, and the problem that the critical rotating speed of the motor rotor is low due to the fact that the weight of the motor rotor is large in the prior art is solved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows a schematic structural view of a compressor motor rotor of an embodiment of the present invention;
FIG. 2 shows a schematic structural view of a compressor motor rotor of an alternative embodiment of the present invention;
FIG. 3 shows an exploded view of a compressor motor rotor of another alternative embodiment of the present invention; and
fig. 4 shows a schematic configuration of a compressor according to an embodiment of the present invention.
In the figure:
1. a magnetic part; 2. a shaft body; 3. a cavity; 4. a sleeve; 5. a first duct; 6. a second duct; 7. a mandrel; 8. a centrifugal impeller; 9. a diffuser; 10. a volute; 11. a bearing support; 12. and a bearing.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a schematic structural view of a motor rotor of the compressor of the present embodiment. As shown in fig. 1, in the present embodiment, the motor rotor of the compressor includes a magnetic portion 1 configured to rotate under the action of the energized coil, and a shaft body 2 connected to the magnetic portion 1 and extending away from the magnetic portion 1 in the axial direction of the motor rotor, and the shaft body 2 is provided with a cavity 3 extending in the axial direction thereof.
The motor rotor of the compressor of the embodiment is provided with the cavity 3 extending along the axial direction of the motor rotor, so that the weight of the motor rotor is reduced, and the maximum rotating speed of the motor rotor is favorably improved.
In the present embodiment, the cavity 3 extends from an end of the shaft body 2 far away from the magnetic portion 1 to an end of the shaft body 2 near the magnetic portion 1.
In another embodiment, as shown in fig. 2, the cavities include a first cavity 3a and a second cavity 3b spaced from the first cavity 3 a. Be solid axis body between first cavity 3a and the second cavity 3b, solid axis body plays supporting role, is favorable to improving electric motor rotor's structural strength.
As shown in fig. 3, in another embodiment, the cavity 3 extends from an end of the shaft body 2 far away from the magnetic portion 1 to the magnetic portion 1 and is spaced apart from an end of the shaft body 2 near the magnetic portion 1, and a solid shaft body is disposed between the cavity 3 and the magnetic portion 1.
The shaft body 2 comprises a first shaft body 2a arranged at the first axial end of the magnetic part 1 along the motor rotor, the motor rotor further comprises a sleeve 4 connected with the first shaft body 2a, and the magnetic part 1 is sleeved in the sleeve 4.
In the present embodiment, the sleeve 4 is integrally formed with the first shaft body 2 a. In other alternative embodiments, the first shaft body 2a is partially or fully sleeved in the sleeve 4.
The shaft body 2 further comprises a second shaft body 2b arranged at a second end of the magnetic part 1 along the axial direction of the motor rotor, and the second shaft body 2b is at least partially sleeved in the sleeve 4.
The rotor of the motor further comprises a first flow channel for discharging the gas in the sleeve 4 when the magnetic part 1 is nested in the sleeve 4.
The first flow passage includes a cavity 3 provided on the first shaft body 2 a. The cavity 3 of the first shaft 2a extends from one end of the first shaft 2a adjacent to the magnetic part 1 to the other end. During the shrink-fitting of the magnetic part 1 in the sleeve 4, the gas in the sleeve 4 is discharged through the cavity 3 in the first shaft body 2 a.
In some embodiments, the cavity 3 of the first shaft body 2a extends from one end of the first shaft body 2a adjacent to the magnetic part 1 to the other end, and the first shaft body 2a is further provided with a through hole for communicating the cavity 3 with the external space of the shaft body 2, optionally the through hole extends along the radial direction of the shaft body 2. The cavity 3 does not have to extend to the end of the first shaft 2a adjacent to the magnetic part 1, and during the shrink-fitting of the magnetic part 1 into the sleeve 4, the gas in the sleeve 4 is exhausted through the cavity 3 of the first shaft 2a and the through hole.
The rotor of the motor further includes a second flow passage for discharging the gas in the sleeve 4 when the second shaft body 2b is fitted into the sleeve 4.
The second flow passage comprises a cavity 3 provided in the second shaft body 2 b. The cavity 3 in the second shaft body 2b extends from one end of the second shaft body 2b adjacent to the magnetic part 1 toward the other end. During the shrink-fitting of 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 2 b.
In some embodiments, the cavity 3 extends from one end adjacent to the magnetic part 1 to the other end, and the second shaft body 2b is further provided with a through hole communicating with the external space of the shaft body 2 of the cavity 3. Alternatively, the through hole extends in the radial direction of the second shaft body 2. During the shrink-fitting of 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 2 b.
In some embodiments, the cavity 3 extends from an end of the second shaft body 2b far away from the magnetic part 1 to the magnetic part 1, the cavity 3 is spaced from the magnetic part 1, and the solid shaft body of the cavity 3 and the magnetic part 1 is provided with an air vent.
Fig. 2 shows a schematic structural diagram of a motor rotor of another alternative embodiment, which includes a first flow passage for discharging gas in the sleeve 4 when the magnetic part 1 is shrink-fitted into the sleeve 4, and the first flow passage includes a first duct 5 provided on the magnetic part 1, and the first duct 5 extends from one end of the magnetic part 1 to the other end in the axial direction of the motor rotor. During the process of shrink-fitting the magnetic part 1 into the sleeve 4, the gas in the sleeve 4 can be discharged through the first hole 5 of the magnetic part 1.
As shown in fig. 2, the cavity 3 provided in the first shaft body 2a includes a first cavity 3a and a second cavity 3b provided at a distance from the first cavity 3 a.
The rotor of the motor further comprises a second flow passage for discharging gas in the sleeve 4 in the process of sleeving the second shaft body 2b into the sleeve 4, wherein the second flow passage comprises a cavity 3 arranged on the second shaft body 2b, and the cavity 3 extends from one end of the second shaft body 2b adjacent to the magnetic part 1 to the other end.
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 in the second shaft body 2b extends from one end adjacent to the magnetic part 1 toward the other end, and the cavity 3 may not necessarily extend to the end of the second shaft body 2b away from the magnetic part 1.
Fig. 3 shows a schematic structural view of a rotor of an electric motor according to another alternative embodiment, which includes a first flow passage for discharging gas in the sleeve 4 when the magnetic part 1 is shrink-fitted into the sleeve 4, and the first flow passage includes a cavity 3 provided in the first shaft body 2a and a second hole 6 for communicating the cavity 3 with an inner cavity of the sleeve 4.
In this embodiment, the cavity 3 on the first shaft body 2a extends towards the magnetic part 1 from the end, far away from the magnetic part 1, of the first shaft body 2a, the cavity 3 is spaced from the inner cavity of the sleeve 4, a second duct 6 is arranged on the solid shaft body between the cavity 3 and the inner cavity of the sleeve 4, and two ends of the second duct 6 are respectively communicated with the inner cavities of the cavity 3 and the sleeve 4.
In the process of sleeving the magnetic part 1 into the sleeve 4, the gas in the sleeve 4 is exhausted through the second hole 6 and the cavity 3 arranged on the first shaft body 2 a.
In some embodiments, the second flow passage for discharging gas when the second shaft body 2b is fitted into the sleeve 4 includes a first hole provided on the magnetic part 1 and a cavity 3 provided on the first shaft body 2 a.
According to another aspect of the present invention, there is also provided a compressor, and fig. 4 shows a schematic structural view of the compressor of the present embodiment. As shown in fig. 4, the compressor of the present embodiment includes a motor rotor including a magnetic part 1 and a shaft body 2 connected to the magnetic part 1.
The compressor also comprises a centrifugal compression part driven by the motor rotor. The centrifugal compression part comprises a centrifugal impeller 8 connected with the end part of the motor rotor, a diffuser 9 used for compressing the refrigerant accelerated by the centrifugal impeller, and a volute 10 used for discharging the compressed refrigerant.
As shown in fig. 4, the compressor further includes a spindle 7, a first end of the spindle 7 is inserted into the upper cavity of the shaft body 2 and is connected with the solid shaft section of the shaft body 2, and a centrifugal impeller 8 is fixed to a second end of the spindle 7.
The centrifugal compression part comprises a first centrifugal compression part arranged at the first end of the motor rotor and a second centrifugal compression part arranged at the second end of the motor rotor. The air suction port of the second centrifugal compression part is communicated with the air discharge port of the first centrifugal compression part, and the second centrifugal compression part is used for compressing the refrigerant compressed by the first centrifugal compression part.
The compressor further comprises a bearing support 11 and a bearing 12 mounted on the bearing support 11, the bearing 12 being adapted to carry the motor rotor. The bearing 12 is an air bearing. Preferably, the air suspension bearing is a dynamic pressure air suspension bearing.
As shown in fig. 1 to 4, the motor rotor of the compressor of the present embodiment mainly includes three sections, namely, a first shaft body 2a, a magnetic portion 1, and a second shaft body 2b, wherein the middle section is the magnetic portion 1, and the first shaft body 2a and the second shaft body 2b are provided with an axially extending cavity 3. The whole mass of the motor rotor is reduced, so that the critical rotating speed of the rotor is improved, and the bearing capacity of the bearing is improved.
The compressor of the present embodiment is a two-stage dynamic pressure air suspension centrifugal compressor. The compressor comprises a first compression part, a second compression part used for compressing the refrigerant compressed by the first compression part, a motor used for driving the first compression part and the second compression part, and a circulating air supply self-cooling system. The self-cooling system with circulating supply air provides cooling medium for cooling and/or lubricating the bearings 12 in the compressor cavity.
The motor rotor system of the compressor mainly comprises a centrifugal impeller 8 of a first compression part, a hollow first shaft body 2a, a magnetic part 1, a hollow second shaft body 2b, a centrifugal impeller 8 of a second compression part and a thrust bearing thrust body. The shaft body 2 of the motor rotor of the compressor comprises a hollow structure and a solid structure. The motor rotor with the structure type can be suitable for rotary machines such as a centrifugal refrigeration compressor, a screw type refrigeration compressor and the like.
The bearing involved in the scheme can be a sliding bearing, can also be a rolling bearing, can also be a magnetic suspension bearing or an air suspension bearing, and is preferably the air suspension bearing considering that the oil-free environment-friendly structure is simple.
The structural schematic diagram of the novel three-section hollow high-speed rotor is shown in fig. 2, the motor rotor mainly comprises a first shaft body 2a, a magnetic part 1 and a second shaft body 2b, the left and right shaft bodies 2 are processed into a hollow structure, a middle core shaft is omitted for the integral magnetic part 1 in the middle, the structure is simplified, and the assembly is reduced. 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 for assembling the magnetic part 1. Or the second shaft body 2b at the right end is processed into a structure similar to the first shaft body 2 a; the solid part of the left end first shaft body 2a can be arranged at a position far away from the magnetic part 1, and a first hole 5 is machined in the center of the magnetic part 1 and can be an unthreaded hole or a threaded hole. The number of the first ducts 5 is reasonably arranged according to the space structure. Similarly, the second shaft body 2b on the right end may use the same structure as the first shaft body 2 a. The hollow structure of the first shaft body 2a and the second shaft body 2b at the left end and the right end can be processed into a whole hole or a small hole and threaded hole structure at a solid part, but the diameter of the hole needs to be strictly controlled, the magnetic part 1 is prevented from being damaged due to the fact that the contact area of the shaft and the magnetic part 1 is too small, and namely the D hole is less than or equal to (1/2) D magnetic part 1. The volumes of the cavities 3 of the two shaft bodies 2 are kept the same or different by the volume of the sleeve sections, or the center of gravity of the motor rotor is close to the center of the whole rotor by adjusting the solid sections of the shaft bodies 2.
This electric motor rotor carries out split type processing, through processing primary shaft body 2a, secondary shaft body 2b and magnetism portion 1 respectively, can effectively guarantee required critical dimension, has simplified the complexity of processing, makes things convenient for the rotor inspection, improves the inspection precision. Small holes can be processed in the centers of the two sections of the shaft body 2 and the magnetic part 1, but the size of the small holes cannot be too large under the influence of the material of the magnetic part 1, and generally, the small holes are processed by
Figure BDA0001920773820000081
It is preferable. Because the motor rotor has gas which can not be discharged in the process of shrink fit, small holes for exhausting gas are required to be added in the solid part of the first shaft body 2a or the second shaft body 2b, and the hole diameter is 2-3 mm.
Through above-mentioned structure, not only solve the bearing capacity problem of bearing effectively, can also improve the critical speed of rotor through the length that reduces the cantilever end, further improve the job stabilization nature and the reliability of motor.
The invention uses the pneumatic suspension bearing, so that the compressor does not need lubricating oil and a control system, and the compressor is more environment-friendly and simpler in structure; meanwhile, the problem of difficulty in integrated processing and inspection of the compressor rotor is solved, the critical rotating speed of the rotor is effectively improved, the working reliability and safety of a shaft system are guaranteed, and the maintenance cost of the compressor is reduced.
The present invention is not limited to the above exemplary embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (15)

1. An electric machine rotor, comprising:
a magnetic part (1) which is used for rotating under the action of the electrified coil; and
the shaft body (2) is connected with the magnetic part (1) and extends away from the magnetic part (1) along the axial direction of the motor rotor, and a cavity (3) extending along the axial direction of the shaft body is arranged on the shaft body (2).
2. The electric machine rotor of claim 1,
the cavity (3) extends from one end of the shaft body (2) far away from the magnetic part (1) to one end of the shaft body (2) close to the magnetic part (1); or
The cavity (3) extends from one end of the shaft body (2) far away from the magnetic part (1) to the magnetic part (1) and is spaced from one end of the shaft body (2) close to the magnetic part (1); or
The cavity (3) comprises a first cavity (3a) and a second cavity (3b) arranged at a distance from the first cavity (3 a).
3. An electric machine rotor according to claim 2, characterised in that the first cavity (3a) extends from the end of the shaft body (2) remote from the magnetic part (1) towards the other end of the shaft body (2), and the second cavity (3b) extends from the end of the shaft body (2) adjacent to the magnetic part (1) towards the other end.
4. The electric motor rotor according to claim 1, characterized in that the shaft body (2) comprises a first shaft body (2a) arranged at a first end of the magnetic part (1) in an axial direction of the electric motor rotor, the electric motor rotor further comprises a sleeve (4) connected with the first shaft body (2a), and the magnetic part (1) is sleeved in the sleeve (4).
5. An electric machine rotor, according to claim 4, characterized in that it further comprises a first flow channel for discharging the gas inside the sleeve (4) when the magnetic part (1) is nested inside the sleeve (4).
6. The electric machine rotor as recited in claim 5, wherein the first flow passage comprises:
the cavity (3) is arranged on the first shaft body (2 a); and/or
And a first pore channel (5) arranged on 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.
7. An electric machine rotor according to claim 5, characterised in that the first flow channel comprises a cavity (3) provided in the first shaft body (2a), the cavity (3) being arranged at a distance from the inner cavity of the sleeve (4), and the first flow channel further comprises a second duct (6) provided in the first shaft body (2a) and communicating the inner cavity of the sleeve with the cavity (3).
8. The electric machine rotor according to claim 4, characterized in that the shaft body (2) further comprises a second shaft body (2b) provided at a second end of the magnetic part (1) in the axial direction of the electric machine rotor, the second shaft body (2b) being at least partially fitted inside the sleeve (4).
9. The electric machine rotor according to claim 8, characterized by further comprising a second flow channel for discharging the gas inside the sleeve (4) when the second shaft body (2b) is nested inside the sleeve (4).
10. The electric machine rotor as recited in claim 9, wherein the second flow path comprises:
said cavity provided on said second shaft body (2 b); and/or
A first duct (5) arranged on the magnetic part (1) and a cavity (3) arranged on the first shaft body (2 a).
11. The electric machine rotor of claim 4,
the first shaft body (2a) and the sleeve (4) are integrally formed; or
The first shaft body (2a) is at least partially sleeved in the sleeve (4).
12. A compressor, characterized in that it comprises an electric machine rotor according to any one of claims 1 to 11.
13. The compressor of claim 12, further comprising:
a centrifugal impeller (8) connected to one end of the shaft body (2) far away from the magnetic part (1); and
and the diffuser (9) is used for compressing the refrigerant accelerated by the centrifugal impeller (8) in the diffuser.
14. The compressor of claim 12, further comprising an air suspension bearing for carrying the motor rotor.
15. An air conditioning apparatus, characterized by comprising a compressor according to any one of claims 12 to 14.
CN201811593278.9A 2018-12-25 2018-12-25 Motor rotor for improving critical rotating speed, compressor and air conditioning equipment Pending CN111371211A (en)

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CN201811593278.9A CN111371211A (en) 2018-12-25 2018-12-25 Motor rotor for improving critical rotating speed, compressor and air conditioning equipment
PCT/CN2019/113949 WO2020134509A1 (en) 2018-12-25 2019-10-29 Motor rotor, compressor and air conditioning device

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Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPO478297A0 (en) * 1997-01-24 1997-02-20 Commonwealth Scientific And Industrial Research Organisation Improvements in high speed electric motors
CN201113592Y (en) * 2007-09-26 2008-09-10 宁波菲仕电机技术有限公司 Alternating-current permanent magnetism servo- electric motor hollow shafting rotor
DE102009046838A1 (en) * 2009-11-18 2011-05-19 Robert Bosch Gmbh Rotor for executing rotation movement around rotation axis of electrical machine in hybrid drive unit, has shaft with connecting section that is arranged for connecting end sections, where shaft is designed in multiparts
CN105226872B (en) * 2015-11-16 2017-12-05 珠海格力节能环保制冷技术研究中心有限公司 The manufacture method of rotor axis of electric, motor and rotor axis of electric
CN206790233U (en) * 2017-04-26 2017-12-22 天津飞旋高速电机科技有限公司 A kind of rotor structure of magnetic suspension ultrahigh speed magneto
CN209344946U (en) * 2018-12-25 2019-09-03 珠海格力电器股份有限公司 Motor and compressor
CN209344879U (en) * 2018-12-25 2019-09-03 珠海格力电器股份有限公司 Motor rotor, compressor and air conditioning equipment
CN209340211U (en) * 2018-12-25 2019-09-03 珠海格力电器股份有限公司 Compressor rotor, compressor and air conditioning equipment
CN209344883U (en) * 2018-12-25 2019-09-03 珠海格力电器股份有限公司 Compressor rotor, compressor and refrigerant circulation system
CN209344878U (en) * 2018-12-25 2019-09-03 珠海格力电器股份有限公司 Motor rotor, compressor and air conditioning equipment
CN209329807U (en) * 2018-12-25 2019-08-30 珠海格力电器股份有限公司 motor rotor, motor and compressor
CN209344889U (en) * 2018-12-25 2019-09-03 珠海格力电器股份有限公司 Motor rotor, compressor, refrigerant circulation system and refrigeration equipment

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