Rotor sleeve, rotor assembly, motor, compressor

Abstract

The present invention provides a rotor sleeve, a rotor assembly, a motor, and a compressor, wherein the rotor sleeve comprises an inner sleeve and an outer sleeve, a first thread is configured on the outer peripheral wall of the inner sleeve, a second thread is configured on the inner hole wall of the outer sleeve, and the outer sleeve is detachably connected to the outer peripheral side of the inner sleeve through the first thread and the second thread. According to the present invention, the inner sleeve and the outer sleeve are threadedly connected, and there is no need to assemble the inner and outer sleeves in a shrink-fit interference fit manner, thereby greatly reducing the difficulty of assembling the rotor sleeve, which is conducive to improving assembly efficiency and reducing production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a rotor sleeve, a rotor assembly, a motor and a compressor. Background Art

[0002] High-speed permanent magnet synchronous motors have the advantages of high power density, reliable operation, and high efficiency. Therefore, they have been widely used in many fields such as industrial production and daily life. However, the temperature rise of motors has always been a difficult problem in the industry. It directly determines the performance and life of the motor. Excessive temperature rise can easily cause motor damage, especially for high-speed permanent magnet motors, because their stator current harmonic magnetic field will produce large eddy current losses on the metal sheath and permanent magnet surface, thereby generating heat, causing the rotor to run at a higher temperature, which can easily cause irreversible demagnetization of the permanent magnet. Therefore, there is an urgent need for a method or structure to reduce the temperature rise of permanent magnets.

[0003] In the prior art, the structure of the metal sheath is improved and optimized in the hope of reducing the temperature rise of the motor rotor to a certain extent. For example, one implementation method is to improve the one-piece rotor sheath in the prior art (based on the requirement of mechanical strength, generally a metal sheath) into an interference fit assembly method of the inner sheath and the outer sheath. The assembly process of this rotor sheath is relatively complicated. Summary of the invention

[0004] Therefore, the present invention provides a rotor sleeve, a rotor assembly, a motor, and a compressor, which can overcome the shortcomings of the related art in that the interference fit assembly process between the inner sleeve and the outer sleeve of the rotor sleeve is complicated.

[0005] In order to solve the above problems, the present invention provides a rotor sleeve, including an inner sleeve and an outer sleeve, wherein the outer peripheral wall of the inner sleeve is configured with a first thread, the inner hole wall of the outer sleeve is configured with a second thread, and the outer sleeve is detachably connected to the outer peripheral side of the inner sleeve through the first thread and the second thread.

[0006] Preferably, the first thread is provided with a plurality of first grooves which penetrate along the axial direction of the inner sleeve, and the second thread is provided with a plurality of second grooves which penetrate along the axial direction of the outer sleeve. When the first thread and the second thread are screwed together to a preset position, the plurality of first grooves and the plurality of second grooves respectively correspond one by one to penetrate along the axial direction of the rotor sleeve to form a plurality of cooling channels together.

[0007] 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, a plurality of the first grooves are evenly spaced along the circumference of the inner sheath.

[0008] Preferably, the inner sheath is made of non-magnetic metal material.

[0009] The present invention also provides a rotor assembly, comprising a rotating shaft and a permanent magnet sleeved on the outer peripheral side of the rotating shaft, wherein the outer peripheral side of the permanent magnet is also sleeved with the above-mentioned rotor sleeve.

[0010] Preferably, the rotor assembly further comprises two heat conducting plates, which are respectively arranged at two axial ends of the permanent magnet and are in contact with the axial ends of the permanent magnet.

[0011] Preferably, the heat conducting plate is constructed with a plurality of flow holes penetrating through its two end surfaces, and the plurality of flow holes are respectively arranged in one-to-one correspondence with the plurality of cooling channels; or, the rotor sleeve is clamped between two of the heat conducting plates.

[0012] Preferably, the heat conducting plate is interference fit on the rotating shaft; and / or the rotor sleeve is interference fit on the outer peripheral side of the permanent magnet.

[0013] The present invention also provides a motor, comprising the above-mentioned rotor assembly.

[0014] The present invention also provides a compressor, comprising the above-mentioned motor.

[0015] The present invention provides a rotor sleeve, a rotor assembly, a motor, and a compressor, wherein the inner sleeve and the outer sleeve are threadedly connected, and there is no need to assemble the inner and outer sleeves by means of shrink-fit interference fit, thereby greatly reducing the difficulty of assembling the rotor sleeve, which is beneficial to improving assembly efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the rotor sleeve of an embodiment of the present invention (radial plane projection);

[0017] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the inner sheath;

[0018] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the outer sheath;

[0019] Figure 4 is a structural schematic diagram (cross section) of a rotor assembly according to another embodiment of the present invention;

[0020] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0021] The reference numerals are:

[0022] 1. rotor sleeve; 11. inner sleeve; 111. first thread; 112. first groove; 12. outer sleeve; 121. second thread; 122. second groove; 2. cooling channel; 100. rotating shaft; 101. permanent magnet; 102. heat conducting plate; 1021. through hole. DETAILED DESCRIPTION

[0023] See also Figures 1 to 5 As shown, according to an embodiment of the present invention, a rotor sleeve is provided, comprising an inner sleeve 11 and an outer sleeve 12, wherein a first thread 111 is configured on the outer peripheral wall of the inner sleeve 11, and a second thread 121 is configured on the inner hole wall of the outer sleeve 12, and the outer sleeve 12 is detachably connected to the outer peripheral side of the inner sleeve 11 through the first thread 111 and the second thread 121, that is, the outer sleeve 12 is threadedly connected to the inner sleeve 11. In this technical solution, the inner sleeve 11 and the outer sleeve 12 are threadedly connected, and there is no need to assemble the inner and outer sleeves in a shrink-fit interference fit manner, thereby greatly reducing the difficulty of assembling the rotor sleeve, which is conducive to improving assembly efficiency and reducing production costs.

[0024] In some embodiments, the first thread 111 is provided with a plurality of first grooves 112 penetrating along the axial direction of the inner sleeve 11, and the second thread 121 is provided with a plurality of second grooves 122 penetrating along the axial direction of the outer sleeve 12. When the first thread 111 and the second thread 121 are screwed together to a preset position (that is, when the axial ends of the inner sleeve 11 and the outer sleeve 12 are flush), the plurality of first grooves 112 and the plurality of second grooves 122 are respectively correspondingly penetrated along the axial direction of the rotor sleeve to jointly form a plurality of cooling channels 2. In this technical solution, by correspondingly setting the plurality of first grooves 112 and second grooves 122, the plurality of cooling channels 2 can be naturally formed after the inner sleeve 11 and the outer sleeve 12 are screwed together as one. The cooling channels 2 can be used for the circulation of cooling medium (such as refrigerant) to achieve efficient cooling of the corresponding rotor assembly. It should be noted that the formation of the cooling channel 2 in this technical solution is achieved by corresponding penetration of corresponding grooves, which is simpler to implement compared with the method of mold casting or separate processing required in the related art.

[0025] 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 can be understood that the first groove 112 will divide the first thread 11 into a plurality of thread segments, and correspondingly, the second groove 122 will divide the second thread 12 into a plurality of thread segments. Preferably, the groove depth of the first groove 12 is consistent with the tooth height of the thread of the first thread 11, and the groove depth of the second groove 122 is consistent with the tooth height of the thread of the second thread 12, so as to ensure that the thickness design of the corresponding sheath is reduced.

[0026] In some embodiments, a plurality of the first grooves 112 are evenly spaced along the circumference of the inner sleeve 11 , and correspondingly, the second grooves 122 are evenly spaced along the circumference of the outer sleeve 12 , so that the heat dissipation of the rotor sleeve in the circumferential direction is more balanced.

[0027] In some embodiments, the inner sheath 11 is made of a non-magnetic metal material, such as copper, aluminum, or the like.

[0028] According to an embodiment of the present invention, a rotor assembly is also provided, comprising a rotating shaft 100 and a permanent magnet 101 mounted on the outer peripheral side of the rotating shaft 100, and the outer peripheral side of the permanent magnet 101 is also mounted with the above-mentioned rotor sleeve 1. Further, the rotor assembly also includes two heat-conducting plates 102, which are respectively arranged at the axial ends of the permanent magnet 101 and contact the axial ends of the permanent magnet 101, so as to accelerate the heat transfer of the permanent magnet 101 along the axial direction of the rotating shaft 100 to the heat-conducting plates 102 on both sides, and further reduce the temperature rise of the rotor. It can be understood that the material of the heat-conducting plate 102 should be a metal material with a high thermal conductivity and non-magnetic conductivity, such as copper, aluminum, etc.

[0029] In some embodiments, the heat conducting plate 102 is configured with a plurality of flow holes 1021 penetrating through its two end surfaces, and the plurality of flow holes 1021 are respectively arranged in one-to-one correspondence with the plurality of cooling channels 2, so that the cooling medium can flow into or out of the cooling channels 2 through the flow holes 1021.

[0030] In some embodiments, the heat conducting plate 102 is interference fit on the rotating shaft 100; and / or the rotor sleeve 1 is interference fit on the outer peripheral side of the permanent magnet 101. In this case, the rotor sleeve 1 is clamped between the two heat conducting plates 102, and its axial ends are in contact with the heat conducting plates 102 without the need to set up a separate connecting structure, which makes the structure of the rotor assembly more streamlined and is also beneficial to ensuring the dynamic balance of the rotor assembly.

[0031] According to an embodiment of the present invention, there is further provided an electric motor, comprising the above-mentioned rotor assembly.

[0032] According to an embodiment of the present invention, a compressor is also provided, comprising the above-mentioned motor.

[0033] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A rotor sleeve, characterized in that: The invention comprises an inner sleeve (11) and an outer sleeve (12); a first thread (111) is formed on the outer peripheral wall of the inner sleeve (11); a second thread (121) is formed on the inner hole wall of the outer sleeve (12); the outer sleeve (12) is detachably connected to the outer peripheral side of the inner sleeve (11) via the first thread (111) and the second thread (121); the first thread (111) is provided with a plurality of first grooves (112) penetrating along the axial direction of the inner sleeve (11); the second thread (121) is provided with a plurality of second grooves (122) penetrating along the axial direction of the outer sleeve (12); when the first thread (111) and the second thread (121) are screwed together to a preset position, the plurality of first grooves (112) and the plurality of second grooves (122) are respectively correspondingly penetrated along the axial direction of the rotor sleeve to form a plurality of cooling channels (2) together.

2. The rotor sleeve according to claim 1, characterized in that: 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); and / or a plurality of the first grooves (112) are evenly spaced along the circumference of the inner sheath (11).

3. The rotor sleeve according to claim 1, characterized in that: The inner sheath (11) is made of a non-magnetic metal material.

4. A rotor assembly, comprising a rotating shaft (100) and a permanent magnet (101) sleeved on the outer circumference of the rotating shaft (100), characterized in that: The outer peripheral side of the permanent magnet (101) is also covered with a rotor sleeve as claimed in any one of claims 2 to 3.

5. The rotor assembly according to claim 4, characterized in that: It also comprises two heat conducting plates (102), which are respectively arranged at two axial ends of the permanent magnet (101) and are in contact with the axial ends of the permanent magnet (101).

6. The rotor assembly according to claim 5, characterized in that The heat conducting plate (102) is provided with a plurality of flow holes (1021) penetrating through its two end surfaces, and the plurality of flow holes (1021) are respectively arranged in a one-to-one correspondence with the plurality of cooling channels (2); or the rotor sleeve (1) is sandwiched between two heat conducting plates (102).

7. The rotor assembly according to claim 5, characterized in that: The heat conducting plate (102) is interference fit on the rotating shaft (100); and / or the rotor sleeve (1) is interference fit on the outer peripheral side of the permanent magnet (101).

8. An electric motor, comprising a rotor assembly, characterized in that: The rotor assembly is the rotor assembly according to any one of claims 5 to 7.

9. A compressor, comprising a motor, characterized in that: The motor is the motor according to claim 8.

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