CN113364182A

CN113364182A - Rotor sheath, rotor subassembly, motor, compressor

Info

Publication number: CN113364182A
Application number: CN202110774458.2A
Authority: CN
Inventors: 龚从勇; 彭利明; 熊博文; 王珊珊; 王仲; 江耀星
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-07-08
Filing date: 2021-07-08
Publication date: 2021-09-07

Abstract

The invention provides a rotor sheath, a rotor assembly, a motor and a compressor, wherein the rotor sheath comprises an inner sheath and an outer sheath, a first thread is formed on the outer peripheral wall of the inner sheath, a second thread is formed on the inner hole wall of the outer sheath, and the outer sheath is detachably connected to the outer peripheral side of the inner sheath through the first thread and the second thread. According to the invention, the inner sheath and the outer sheath are in threaded connection, and the inner sheath and the outer sheath do not need to be assembled in a way of shrink fit, so that the assembly difficulty of the rotor sheath is greatly reduced, the assembly efficiency is improved, and the production cost is reduced.

Description

Rotor sheath, rotor subassembly, motor, compressor

Technical Field

The invention belongs to the technical field of motor manufacturing, and particularly relates to a rotor sheath, a rotor assembly, a motor and a compressor.

Background

The high-speed permanent magnet synchronous motor has the advantages of high power density, reliable operation, high efficiency and the like, so that the high-speed permanent magnet synchronous motor is widely applied to various fields such as industrial production, daily life and the like. However, the problem of temperature rise of the motor is always a difficult point in the industry, the problem directly determines the service performance and service life of the motor, the motor is easily damaged due to overhigh temperature rise, and particularly for a high-speed permanent magnet motor, the rotor is easy to generate irreversible demagnetization of the permanent magnet due to the fact that a stator current harmonic magnetic field of the high-speed permanent magnet motor generates large eddy current loss on the surfaces of a metal sheath and the permanent magnet and further generates heat, and the rotor runs at a high temperature. Therefore, a method or structure for reducing the temperature rise of the permanent magnet is urgently needed.

The structure of the metal sheath is improved and optimized in the prior art, so that the temperature rise of the motor rotor can be expected to be reduced to a certain extent, for example, an implementation mode is a mode that the integrated rotor sheath (based on the requirement of mechanical strength, generally the metal sheath) in the prior art is improved into interference assembly of the inner sheath and the outer sheath, and the assembly process of the rotor sheath is complex.

Disclosure of Invention

Therefore, the invention provides a rotor sheath, a rotor assembly, a motor and a compressor, which can overcome the defect of complex interference fit sleeving process between an inner sheath and an outer sheath of the rotor sheath in the related technology.

In order to solve the above problem, the present invention provides a rotor sheath, including an inner sheath and an outer sheath, wherein a first thread is configured on an outer circumferential wall of the inner sheath, a second thread is configured on an inner hole wall of the outer sheath, and the outer sheath is detachably connected to an outer circumferential side of the inner sheath through the first thread and the second thread.

Preferably, a plurality of first grooves which penetrate through the inner sheath in the axial direction are formed in the first threads, a plurality of second grooves which penetrate through the outer sheath in the axial direction are formed in the second threads, and when the first threads and the second threads are screwed to preset positions, the plurality of first grooves and the plurality of second grooves penetrate through the rotor sheath in the axial direction in a one-to-one correspondence mode to form a plurality of cooling channels together.

Preferably, the notch of the first groove faces one side of the outer sheath, and the notch of the second groove faces one side of the inner sheath; and/or the first grooves are uniformly arranged at intervals along the circumferential direction of the inner sheath.

Preferably, the inner sheath is made of a non-magnetic conductive metal material.

The invention also provides a rotor assembly, which comprises a rotating shaft and the permanent magnet sleeved on the outer peripheral side of the rotating shaft, wherein the rotor sheath is sleeved on the outer peripheral side of the permanent magnet.

Preferably, the rotor assembly further comprises two heat-conducting plates, the two heat-conducting plates are respectively arranged at two axial ends of the permanent magnet and are in contact with the axial end portions of the permanent magnet.

Preferably, the heat conducting plate is provided with a plurality of through holes penetrating through two end faces of the heat conducting plate, and the plurality of through holes are respectively arranged in one-to-one correspondence with the plurality of cooling flow channels; or the rotor sheath is clamped between the two heat-conducting plates.

Preferably, the heat conducting plate is sleeved on the rotating shaft in an interference manner; and/or the rotor sheath is sleeved on the outer peripheral side of the permanent magnet in an interference manner.

The invention also provides a motor comprising the rotor assembly.

The invention also provides a compressor which comprises the motor.

According to the rotor sheath, the rotor assembly, the motor and the compressor, the inner sheath is in threaded connection with the outer sheath, and the inner sheath and the outer sheath do not need to be assembled in a hot-jacket interference fit mode, so that the assembly difficulty of the rotor sheath is greatly reduced, the assembly efficiency is improved, and the production cost is reduced.

Drawings

FIG. 1 is a schematic structural view (radial plane projection) of a rotor sheath according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the inner sheath of FIG. 1;

FIG. 3 is a perspective view of the outer sheath of FIG. 1;

FIG. 4 is a schematic structural view (in cross section) of a rotor assembly according to another embodiment of the present invention;

fig. 5 is a partial enlarged view of a portion a in fig. 4.

The reference numerals are represented as:

1. a rotor sheath; 11. an inner sheath; 111. a first thread; 112. a first groove; 12. an outer sheath; 121. a second thread; 122. a second groove; 2. a cooling flow channel; 100. a rotating shaft; 101. a permanent magnet; 102. a heat conducting plate; 1021. and (6) a through flow hole.

Detailed Description

Referring to fig. 1 to 5 in combination, according to an embodiment of the present invention, a rotor sheath is provided, which includes an inner sheath 11 and an outer sheath 12, a first thread 111 is configured on an outer circumferential wall of the inner sheath 11, a second thread 121 is configured on an inner hole wall of the outer sheath 12, and the outer sheath 12 is detachably connected to an outer circumferential side of the inner sheath 11 through the first thread 111 and the second thread 121, that is, the outer sheath 12 is in threaded connection with the inner sheath 11. In the technical scheme, the inner sheath 11 is in threaded connection with the outer sheath 12, and the inner sheath and the outer sheath are not required to be assembled in a hot-jacket interference fit mode, so that the assembling difficulty of the rotor sheath is greatly reduced, the assembling efficiency is improved, and the production cost is reduced.

In some embodiments, the first thread 111 is provided with a plurality of first grooves 112 penetrating along the axial direction of the inner sheath 11, the second thread 121 is provided with a plurality of second grooves 122 penetrating along the axial direction of the outer sheath 12, and when the first thread 111 and the second thread 121 are screwed to a preset position (that is, when the axial ends of the inner sheath 11 and the outer sheath 12 are flush), the plurality of first grooves 112 and the plurality of second grooves 122 respectively penetrate along the axial direction of the rotor sheath in a one-to-one correspondence manner to form a plurality of cooling channels 2 together. In this technical scheme, through the corresponding arrangement of the plurality of first grooves 112 and the plurality of second grooves 122, the plurality of cooling channels 2 can be naturally formed after the inner jacket 11 and the outer jacket 12 are screwed together, and the cooling channels 2 can be used for the circulation of a cooling medium (for example, a refrigerant) to further realize the efficient cooling of the corresponding rotor assembly. It should be noted that, the formation of the cooling flow channel 2 in the technical solution is realized by the corresponding penetration of the corresponding groove, which is simpler to realize compared with the mode of mold-opening pouring or separate processing in the related art.

Preferably, the notch of the first groove 112 faces one side of the outer sheath 12, and the notch of the second groove 122 faces one side of the inner sheath 11. It will be appreciated that the first recess 112 will divide the first thread 11 into a plurality of thread segments and correspondingly the second recess 122 will divide the second thread 12 into a plurality of thread segments. Preferably, the depth of the first groove 12 corresponds to the height of the thread of the first thread 11, and the depth of the second groove 122 corresponds to the height of the thread of the second thread 12, so that a reduction in thickness of the corresponding jacket design can be ensured.

In some embodiments, the first grooves 112 are uniformly spaced along the circumference of the inner sheath 11, and correspondingly, the second grooves 122 are uniformly spaced along the circumference of the outer sheath 12, so as to make the heat dissipation of the rotor sheath in the circumferential direction more uniform.

In some embodiments, the inner sheath 11 is made of a non-magnetic conductive metal material, such as copper, aluminum, and the like.

According to an embodiment of the present invention, there is also provided a rotor assembly, including a rotating shaft 100 and a permanent magnet 101 sleeved on an outer peripheral side of the rotating shaft 100, wherein the rotor sheath 1 is further sleeved on an outer peripheral side of the permanent magnet 101. Further, the rotor subassembly still includes two heat-conducting plates 102, two heat-conducting plates 102 set up respectively in the axial both ends of permanent magnet 101, and with the axial tip contact of permanent magnet 101, in order to accelerate the heat of permanent magnet 101 along the axial of pivot 100 is to the heat-conducting plate 102 transmission on both sides, can further reduce the rotor temperature rise. It is understood that the material of the heat conducting plate 102 should be selected from a metal material with high thermal conductivity and non-magnetic conductivity, such as copper, aluminum, etc.

In some embodiments, the heat conducting plate 102 is provided with a plurality of through holes 1021 penetrating both end surfaces thereof, and the plurality of through holes 1021 are provided in one-to-one correspondence with the plurality of cooling channels 2, so that a cooling medium can flow into or out of the cooling channels 2 through the through holes 1021.

In some embodiments, the heat-conducting plate 102 is fitted over the shaft 100 in an interference fit; and/or, the rotor sheath 1 is sleeved on the outer peripheral side of the permanent magnet 101 in an interference manner, at the moment, the rotor sheath 1 is clamped between the two heat conduction plates 102, and the two axial ends of the rotor sheath are in contact fit with the heat conduction plates 102 without arranging an independent connection structure, so that the structure of the rotor assembly is more simplified, and the dynamic balance of the rotor assembly is also favorably ensured.

According to an embodiment of the present invention, there is also provided a motor including the rotor assembly described above.

According to an embodiment of the present invention, there is also provided a compressor including the motor described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A rotor sheath is characterized by comprising an inner sheath (11) and an outer sheath (12), wherein a first thread (111) is formed on the outer peripheral wall of the inner sheath (11), a second thread (121) is formed on the inner hole wall of the outer sheath (12), and the outer sheath (12) is detachably connected to the outer peripheral side of the inner sheath (11) through the first thread (111) and the second thread (121).

2. The rotor sheath according to claim 1, characterized in that the first thread (111) is provided with a plurality of first grooves (112) penetrating in the axial direction of the inner sheath (11), the second thread (121) is provided with a plurality of second grooves (122) penetrating in the axial direction of the outer sheath (12), and when the first thread (111) and the second thread (121) are screwed to a preset position, the plurality of first grooves (112) and the plurality of second grooves (122) respectively penetrate in the axial direction of the rotor sheath in a one-to-one correspondence manner to form a plurality of cooling channels (2).

3. The rotor sheath according to claim 2, characterized in that the slot of the first groove (112) is directed towards one side of the outer sheath (12) and the slot of the second groove (122) is directed towards one side of the inner sheath (11); and/or a plurality of first grooves (112) are uniformly arranged at intervals along the circumferential direction of the inner sheath (11).

4. The rotor sheath according to claim 1, characterized in that the material of the inner sheath (11) is a non-magnetic conductive metal material.

5. A rotor assembly, comprising a rotating shaft (100) and a permanent magnet (101) sleeved on the outer periphery of the rotating shaft (100), characterized in that the outer periphery of the permanent magnet (101) is further sleeved with a rotor sheath (1) according to any one of claims 2 to 4.

6. The rotor assembly according to claim 5, further comprising two heat-conducting plates (102), wherein the two heat-conducting plates (102) are respectively disposed at both axial ends of the permanent magnet (101) and are in contact with the axial end portions of the permanent magnet (101).

7. The rotor assembly as claimed in claim 6, wherein the heat conducting plate (102) is configured with a plurality of through holes (1021) through both end surfaces thereof, the plurality of through holes (1021) being respectively arranged in one-to-one correspondence with the plurality of cooling channels (2); or the rotor sheath (1) is clamped between the two heat-conducting plates (102).

8. The rotor assembly of claim 6, wherein the heat conducting plate (102) is fitted on the rotating shaft (100) in an interference manner; and/or the rotor sheath (1) is sleeved on the outer peripheral side of the permanent magnet (101) in an interference manner.

9. An electrical machine comprising a rotor assembly, wherein the rotor assembly is as claimed in any one of claims 5 to 8.

10. A compressor comprising an electric motor, wherein the electric motor is the electric motor of claim 9.