Rotor assembly and motor

Abstract

The present invention relates to the field of motor technology, and more specifically to a rotor assembly and a motor. The rotor assembly comprises: a rotor comprising a main body section and a shaft section extending from an end of the main body section, wherein the outer diameter of the main body section is greater than the outer diameter of the shaft section; a bearing shell surrounding the rotor and having both ends of the bearing shell sealed to the rotor, forming an annular cavity between the bearing shell and the rotor, the bearing shell being provided with a medium inlet and a medium outlet, the length of the bearing shell being less than or equal to the length of the main body section, and the projection of the bearing shell on the rotor being located on the main body section. The medium acts as a suspension support for the rotor, and because the projection of the bearing shell on the rotor is located on the main body section, the front and rear end faces of the rotor are exposed. After being actually assembled inside the stator core, the front and rear end faces of the rotor are exposed outside the stator, thereby improving the heat dissipation capacity of the rotor and reducing the temperature rise of the rotor during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a rotor assembly and a motor. Background Art

[0002] Motors are subject to various losses during operation, and heat generation has always been a key and challenging issue during design and development. The higher the motor temperature, the greater the losses at the same current, reducing motor efficiency and potentially even preventing long-term operation. The significant temperature rise on the rotor surface makes it difficult to dissipate heat. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the rotor of the motor is difficult to dissipate heat, thereby providing a rotor assembly and a motor that can effectively cool the rotor.

[0004] To solve the above technical problems, the present invention provides a rotor assembly, comprising: a rotor, comprising a main body section and a shaft section extending from the end of the main body section, wherein the outer diameter of the main body section is greater than the outer diameter of the shaft section; a bearing shell, surrounding the outside of the rotor and with both ends of the bearing shell sealedly connected to the rotor, forming an annular cavity between the bearing shell and the rotor, the bearing shell being provided with a medium inlet and a medium outlet, the length of the bearing shell being less than or equal to the length of the main body section, and the projection of the bearing shell on the rotor being located on the main body section.

[0005] Optionally, the bearing housing includes a cylindrical shell surrounding the rotor and sealing rings arranged at both ends of the shell and sealedly connected to the shell and the rotor respectively, and the medium inlet and the medium outlet are arranged on the shell.

[0006] Optionally, the rotor assembly further includes a cooling device, wherein the outlet of the cooling device is communicated with the medium inlet, and the inlet of the cooling device is communicated with the medium outlet.

[0007] Optionally, the rotor assembly further includes a pressurizing device, which is disposed between the cooling device and the medium inlet and / or the medium outlet, and is used to pressurize the medium flowing into the housing.

[0008] Optionally, the medium inlet is located at the bottom of the shell, and the medium outlet is located at the top of the shell.

[0009] Optionally, two medium inlets are symmetrically provided at the bottom of the shell, and the two medium inlets are respectively close to the ends of the shell, and two medium outlets are symmetrically provided at the top of the shell, and the two medium outlets are respectively close to the ends of the shell.

[0010] Optionally, the medium inlet and the medium outlet close to the same end of the shell are symmetrically arranged about the axis of the shell.

[0011] Optionally, the medium flowing into the bearing housing is liquid.

[0012] Optionally, an annular groove is provided on the end surface of the main body segment, and the axis of the annular groove is collinear with the axis of the main body segment.

[0013] Optionally, the main body section is an annular structure, and the inner wall of the main body section is provided with at least two mounting grooves extending axially along the circumference of the main body section, and the shaft section has a mounting protrusion adapted to the mounting groove, and the mounting protrusion is embedded in the mounting groove and can slide along the mounting groove.

[0014] Optionally, the shaft segment includes a first connecting segment and a second connecting segment, the first connecting segment is provided with the mounting protrusion, the second connecting segment at least partially extends out of the end of the main segment, and the outer diameter of the second connecting segment is smaller than the outer diameter of the first connecting segment.

[0015] Optionally, the rotor assembly further includes a positioning structure, the positioning structure being used to fix the position of the shaft segment within the main body segment, the positioning structure including:

[0016] a first fixing block, embedded in the mounting groove and located between the two shaft segments;

[0017] The second fixing block is embedded in the installation groove and has one end abutting against the shaft section, and the other end extending out of the end portion of the main body section.

[0018] The present invention also provides a motor comprising the rotor assembly.

[0019] The technical solution of the present invention has the following advantages:

[0020] The rotor assembly provided by the present invention is provided with a bearing shell, and a medium inlet and a medium outlet are provided on the bearing shell. The medium can enter the bearing shell through the medium inlet and is located between the bearing shell and the rotor. Since the bearing shell is sealed to the rotor, the medium can be sealed between the bearing shell and the rotor, preventing the medium from flowing out of the gap between the bearing shell and the rotor when the rotor is running smoothly, accelerating, decelerating, starting, and stopping. The medium acts as a suspension support for the rotor. At the same time, since the projection of the bearing shell on the rotor is located on the main section, the front and rear end faces of the rotor are exposed. After being actually assembled into the interior of the stator core, the front and rear end faces of the rotor are exposed outside the stator, thereby improving the heat dissipation capacity of the rotor and reducing the temperature rise of the rotor during operation. At the same time, in the prior art, the portion of the rotor located outside the stator requires bearing support. However, in this embodiment, the rotor is supported by the medium, eliminating the need for additional bearings, thereby reducing the axial length of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of a rotor assembly provided in one embodiment of the present invention;

[0023] Figure 2 for Figure 1 A front view of the rotor assembly is shown;

[0024] Figure 3 for Figure 1 a right side view of the rotor assembly shown;

[0025] Figure 4 for Figure 1 a left side view of the rotor assembly shown;

[0026] Figure 5 for Figure 1 A schematic structural diagram of the shell in FIG.

[0027] Figure 6 for Figure 5 A top view of the housing is shown;

[0028] Figure 7 for Figure 5 A cross-sectional view of the housing is shown;

[0029] Figure 8 for Figure 1 Schematic diagram of the structure of the sealing ring;

[0030] Figure 9 This is a schematic structural diagram of a rotor body of a rotor assembly provided in another embodiment of Example 1 of the present invention;

[0031] Figure 10 This is a schematic structural diagram of a shaft segment provided in another embodiment of Example 1 of the present invention;

[0032] Figure 11 This is a schematic structural diagram of another shaft segment provided in another implementation manner of Example 1 of the present invention;

[0033] Figure 12 This is a schematic structural diagram of the first fixing block provided in Example 1 of the present invention;

[0034] Figure 13 This is a schematic structural diagram of the second fixing block provided in Example 1 of the present invention;

[0035] Figure 14 A cross-sectional view of a motor provided in one embodiment of Example 2 of the present invention;

[0036] Figure 15 This is a left side view of a motor provided in one embodiment of Example 2 of the present invention;

[0037] Figure 16 This is a right side view of a motor provided in one embodiment of Example 2 of the present invention;

[0038] Figure 17 for Figure 14 Schematic diagram of the structure of the stator core;

[0039] Figure 18 This is a schematic structural diagram of a motor provided in another embodiment of Example 2 of the present invention;

[0040] Figure 19 for Figure 18 sectional view of .

[0041] Description of reference numerals:

[0042] 1. Rotor; 101. Main body section; 1011. Annular groove; 1012. Mounting groove; 102. Shaft section; 1021. Mounting protrusion; 1022. First connecting section; 1023. Second connecting section; 2. Housing; 201. Medium inlet; 202. Medium outlet; 203. First housing section; 204. Second housing section; 205. Step surface; 3. Sealing ring; 4. Stator core; 5. First fixing block; 6. Second fixing block. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0046] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] Example 1

[0048] Motors are subject to various losses during operation, and heat generation has always been a key and challenging issue during design and development. The higher the motor temperature, the greater the losses at the same current, reducing motor efficiency and potentially even preventing long-term operation. The significant temperature rise on the rotor surface makes it difficult to dissipate heat.

[0049] At the same time, compared with electromagnetic motors, permanent magnet motors have the advantages of small size, simple structure, reliable operation, low loss, and high efficiency, so they are widely used, especially rare earth permanent magnet motors. However, for permanent magnet motors, when the rotor is processed, the rotor offset caused by processing errors must be checked online for rotor dynamic balancing. The prior art discloses an online dynamic balancing structure for a motor rotor, in which a plurality of balancing holes concentric with the rotor are respectively provided on the end face of the rotor. The balancing holes are used to place balancing pins for dynamic balancing. This structure is difficult to process, and the balancing holes can only check the imbalance of the fixed angle and the mass of the balancing pins. The verification is difficult and the operation is complicated.

[0050] To this end, this embodiment provides a rotor assembly.

[0051] In one embodiment, Figures 1 to 8 As shown, the rotor assembly includes a rotor 1 and a bearing housing. The rotor 1 includes a main body section 101 and a shaft section 102 extending from the end of the main body section 101. The outer diameter of the main body section 101 is larger than the outer diameter of the shaft section 102. The bearing housing surrounds the rotor 1 and is sealed to the rotor at both ends. An annular cavity is formed between the bearing housing and the rotor 1. The bearing housing is provided with a medium inlet 201 and a medium outlet 202. The length of the bearing housing is less than or equal to the length of the main body section 101, and the projection of the bearing housing on the rotor 1 is located on the main body section 101.

[0052] In this embodiment, a bearing housing is provided, and a medium inlet 201 and a medium outlet 202 are provided on the bearing housing. Medium can enter the bearing housing through the medium inlet 201 and be located between the bearing housing and the rotor 1. Since the bearing housing and the rotor 1 are sealed, the medium can be sealed between the bearing housing and the rotor 1, preventing the medium from escaping from the gap between the bearing housing and the rotor 1 during stable operation, acceleration, deceleration, startup, and shutdown of the rotor 1. The medium provides a suspending support for the rotor 1. Furthermore, since the projection of the bearing housing on the rotor 1 is located on the main body section 101, the front and rear end faces of the rotor 1 are exposed. After being assembled within the stator core 4, the front and rear end faces of the rotor 1 are exposed outside the stator, improving the heat dissipation capacity of the rotor 1 and reducing the temperature rise of the rotor 1 during operation. Furthermore, in the prior art, the portion of the rotor 1 located outside the stator requires bearing support. However, in this embodiment, by supporting the rotor 1 with the medium, no additional bearings are required, thereby reducing the axial length of the rotor 1.

[0053] On the basis of the above embodiment, in a preferred embodiment, the bearing shell includes a cylindrical shell 2 surrounding the outside of the rotor 1 and a sealing ring 3 provided at both ends of the shell 2 and sealedly connected to the shell 2 and the rotor 1 respectively. The medium inlet 201 and the medium outlet 202 are provided on the shell 2. It should be noted that the sealing ring 3 is connected to the shell 2 without a gap, and there can be a certain gap between the sealing ring 3 and the rotor 1. The size of the gap is sufficient to prevent the medium from leaking through the gap between the sealing ring 3 and the rotor 1. This arrangement can ensure that the medium will not leak and will not affect the normal rotation of the rotor 1. In this embodiment, by separately providing the shell 2 and the sealing ring 3, it is convenient to process the shell 2 without requiring very high processing precision. In an alternative embodiment, the bearing shell is an integrated structure and is directly and sealedly connected to the rotor 1.

[0054] like Figure 5 and Figure 7As shown, the housing 2 includes a first shell segment 203 and a second shell segment 204 connected at both ends of the first shell segment 203. The second shell segment 204 and the first shell segment 203 are connected to form an integral structure. The outer diameter of the first shell segment 203 is equal to the outer diameter of the second shell segment 204. The inner diameter of the first shell segment 203 is smaller than the inner diameter of the second shell segment 204 to form a step surface 205 between the first shell segment 203 and the second shell segment 204. The sealing ring 3 is supported on the step surface 205. The medium inlet 201 and the medium outlet 202 are both formed on the first shell segment 203.

[0055] It should be noted that the housing 2 is made of high-strength, non-magnetic material and will not affect the performance of the motor.

[0056] Based on the above embodiment, in a preferred embodiment, the rotor assembly further includes a cooling device, the outlet of the cooling device being in communication with the medium inlet 201, and the inlet of the cooling device being in communication with the medium outlet 202. In this embodiment, the cooling device is capable of cooling the medium, ensuring that the medium flowing into the housing 2 is a low-temperature medium. The medium is in full contact with the rotor 1 to cool the rotor 1, further improving the heat dissipation capacity of the rotor 1 and reducing the temperature rise of the rotor 1 during operation. Therefore, by providing the cooling device, the medium can both support the rotor 1 and cool it.

[0057] Based on the above embodiment, in a preferred embodiment, the rotor assembly further includes a pressurizing device, which is disposed between the cooling device and the medium inlet 201 and / or the medium outlet 202, and is used to pressurize the medium flowing into the housing 2. In this embodiment, the provision of the pressurizing device can pressurize the medium, thereby ensuring that the medium flowing into the housing 2 has a higher pressure, thereby ensuring that the medium supports the rotor 1, causing the rotor 1 to float within the housing 2 without contacting the rotor 1, thereby avoiding friction with the housing 2 and ensuring heat dissipation of the rotor 1.

[0058] In one embodiment, the cooling device is connected to the medium inlet 201 via a first pipeline, and a pressure boosting device is provided on the first pipeline. The cooling device may include a compressor, a condenser, a throttle valve, and an evaporator, and the pressure boosting device may be a booster pump. In an alternative embodiment, the cooling device is connected to the medium outlet 202 via a second pipeline, and a pressure boosting device is provided on the second pipeline. In another alternative embodiment, a pressure boosting device may be provided on both the first pipeline and the second pipeline.

[0059] On the basis of the above embodiment, in a preferred embodiment, as Figures 5 to 7As shown, the medium inlet 201 is located at the bottom of the housing 2, and the medium outlet 202 is located at the top of the housing 2. In this embodiment, since the medium inlet 201 is located at the bottom of the housing 2 and the medium outlet 202 is located at the top of the housing 2, the medium can help lift the rotor 1, thereby suspending the rotor 1 within the housing 2. Of course, in other alternative embodiments, when the medium pressure is sufficient and the sealing performance between the housing 2 and the rotor 1 is good, the medium inlet 201 and the medium outlet 202 can be located at other locations.

[0060] Based on the above embodiment, in a preferred embodiment, two medium inlets 201 are symmetrically provided at the bottom of the housing 2, and the two medium inlets 201 are respectively close to the ends of the housing 2. Two medium outlets 202 are symmetrically provided at the top of the housing 2, and the two medium outlets 202 are respectively close to the ends of the housing 2. In this embodiment, since two medium inlets 201 are symmetrically provided at the bottom of the housing 2 and two medium outlets 202 are symmetrically provided at the top of the housing 2, the supporting force of the medium on the rotor 1 can be made more uniform.

[0061] Based on the above embodiment, in a preferred embodiment, the medium inlet 201 and the medium outlet 202 near the same end of the housing 2 are symmetrically arranged about the axis of the housing 2. In this embodiment, by arranging the medium inlet 201 and the medium outlet 202 near the same end of the housing 2 symmetrically about the axis of the housing 2, that is, the medium inlet 201 and the medium outlet 202 are opposite to each other and distributed on the same diameter, it is possible to ensure that the medium is evenly distributed within the housing 2, thereby ensuring uniform and sufficient contact between the medium and the rotor 1, thereby ensuring the suspension and heat dissipation effects.

[0062] Based on the above embodiment, in a preferred embodiment, the medium flowing into the bearing housing is a liquid. In this embodiment, since the medium is liquid, the friction between the rotor 1 and the medium during rotation is low, which can reduce temperature rise. At the same time, compared with gaseous media, liquid media is more conducive to supporting the rotor 1 and allowing the rotor 1 to be suspended within the bearing housing.

[0063] The medium is a liquid with good supporting performance and strong thermal conductivity. The chemical properties of the medium are stable and it does not chemically react with the components of the rotor 1, the sealing ring 3 and the housing 2, thereby ensuring stable operation of the motor.

[0064] Based on the above embodiment, in a preferred embodiment, an annular groove 1011 is provided on the end surface of the main body section 101, and the axis of the annular groove 1011 is collinear with the axis of the main body section 101. In this embodiment, when performing dynamic balancing on the rotor 1, an inline dynamic balancing weighting material can be added to the annular groove 1011. Because the central angle of the annular groove 1011 is 360°, the correction angle is between 0 and 360°, achieving high calibration accuracy.

[0065] Online dynamic balancing involves adding weight by heating a solid material with a low melting point and high adhesion strength into the annular groove 1011, or by attaching the weight by gluing or welding. For most rotors, the amount of weight required for online dynamic balancing is less than a few hundred milligrams. The filler material, welding, and gluing accurately balance the imbalance, and the minimum calibration weight is controllable, resulting in effective online dynamic balancing. De-weighting grinding can also be used for calibration.

[0066] Combine Figures 14 to 16 , annular grooves 1011 are provided on the front and rear end surfaces of the main body section 101.

[0067] On the basis of the above embodiment, in a preferred embodiment, an impeller is connected to the shaft section 102 of the rotor 1 , which can further reduce the temperature rise of the rotor 1 .

[0068] On the basis of the above embodiment, in a preferred embodiment, as Figure 9 As shown, the main body section 101 is an annular structure, and the inner wall of the main body section 101 is provided with at least two mounting grooves 1012 extending along the axial direction of the main body section 101 along its circumference. Figure 10 and Figure 11 The shaft section 102 has a mounting protrusion 1021 that fits within the mounting groove 1012. The mounting protrusion 1021 is embedded in the mounting groove 1012 and can slide along the mounting groove 1012. In this embodiment, since the main body section 101 is annular, that is, hollow, structure, the critical speed of the rotor 1 as a whole can be increased. By providing the mounting groove 1012 on the inner wall of the main body section 101, the shaft section 102 is connected to the mounting groove 1012 via the mounting protrusion 1021. The mounting protrusion 1021 can slide along the mounting groove 1012. Therefore, the installation position of the shaft section 102 within the main body section 101 can be adjusted, thereby achieving the purpose of adjusting the overall length of the rotor 1 and meeting the load requirements of different occasions. Since the shaft section 102 and the main body section 101 are connected by the mounting groove 1012 and the mounting protrusion, the shaft section 102 and the main body section 101 are detachably connected. Therefore, the overall length of the rotor 1 can also be adjusted by replacing the shaft section 102 with a different length.

[0069] Specifically in one embodiment, four mounting grooves 1012 are evenly arranged along the circumference of the main body section 101 , and correspondingly, the shaft section 102 has four mounting grooves 1012 .

[0070] In a preferred embodiment, the mounting groove 1012 runs through both ends of the main body section 101 , which can further increase the adjustable length range of the rotor 1 .

[0071] Based on the above embodiment, in a preferred embodiment, shaft segment 102 includes a first connecting segment 1022 and a second connecting segment 1023. The first connecting segment 1022 is provided with a mounting protrusion 1021. The second connecting segment 1023 at least partially extends beyond the end of the main segment 101. The outer diameter of the second connecting segment 1023 is smaller than that of the first connecting segment 1022. In this embodiment, by making the outer diameter of the second connecting segment 1023 smaller than that of the first connecting segment 1022, the overall weight of the rotor assembly can be further reduced, thereby increasing the critical speed of the rotor assembly.

[0072] In a preferred embodiment, the outer diameter of the first connecting segment 1022 is equal to the inner diameter of the main body segment 101 .

[0073] Based on the above embodiment, in a preferred embodiment, the rotor assembly further includes a positioning structure for fixing the position of the shaft segment 102 within the main body segment 101, and the positioning structure includes a first fixing block 5 and a second fixing block 6. The first fixing block 5 is embedded in the mounting groove 1012 and is located between the two shaft segments 102; the second fixing block 6 is embedded in the mounting groove 1012 with one end abutting against the shaft segment 102 and the other end extending out of the end of the main body segment 101. In this embodiment, by embedding the first fixing block 5 and the second fixing block 6 in the mounting groove 1012, the first fixing block 5 and the second fixing block 6 are respectively located on both sides of the first connecting section 1022 of the shaft segment 102, thereby limiting and fixing the position of the shaft segment 102. By extending the second fixing block 6 out of the end of the main body segment 101, the extended portion can be used as an online dynamic balancing check surface, and dynamic balancing is performed by polishing the extended portion of the second fixing block 6.

[0074] The shape of the first fixing block 5 is as follows Figure 12 As shown, the shape of the second fixing block 6 is as follows Figure 13 As shown, in an alternative embodiment, the first fixing block 5 can be composed of multiple second fixing blocks 6.

[0075] In a preferred embodiment, the first fixing block 5 and the second fixing block 6 are both iron blocks. Of course, in other alternative embodiments, the first fixing block 5 and the second fixing block 6 can be other metal blocks.

[0076] Example 2

[0077] This embodiment provides a motor, such as Figures 14 to 19 As shown, it includes the rotor assembly provided in the above embodiment and a stator arranged outside the bearing housing. Figure 14 is a schematic diagram of a motor including a rotor assembly provided in one of the above embodiments, Figure 18 and Figure 19 Schematic diagram of a motor including a rotor assembly provided in another embodiment of the above embodiment.

[0078] The motor provides a bearing shell made of non-magnetic material between the stator and the rotor 1. The bearing shell and the medium inside the bearing shell constitute a suspended bearing that supports the rotor 1. There is no need to provide an additional bearing on the outside of the stator to support the rotor 1, thereby reducing the axial length of the motor and making the structure more compact. The length of the suspended bearing is less than or equal to the length of the maximum outer diameter of the rotor 1, which can expose the front and rear end faces of the rotor 1, thereby improving the heat dissipation capacity of the rotor 1 and reducing the operating temperature rise of the rotor 1.

[0079] The stator includes a stator core 4 and a stator winding. Figure 14 and Figure 19 Only the stator core 4 is shown.

[0080] Combine Figure 14 and Figure 19 The two ends of the bearing shell are located outside the stator core 4, and the medium inlet 201 and the medium outlet 202 are located outside the stator core 4, which facilitates the introduction of the medium into the bearing shell.

[0081] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A rotor assembly, characterized in that: include: A rotor (1) comprises a main body section (101) and a shaft section (102) extending from an end of the main body section (101), wherein the outer diameter of the main body section (101) is greater than the outer diameter of the shaft section (102); A bearing shell surrounds the rotor (1) and is sealed to the rotor (1) at both ends thereof, forming an annular cavity between the bearing shell and the rotor (1), a medium inlet (201) and a medium outlet (202) being provided on the bearing shell, the length of the bearing shell being less than or equal to the length of the main body section (101), and a projection of the bearing shell on the rotor (1) being located on the main body section (101). The bearing housing comprises a cylindrical housing (2) surrounding the rotor (1) and sealing rings (3) arranged at both ends of the housing (2) and respectively sealed to the housing (2) and the rotor (1); the medium inlet (201) and the medium outlet (202) are arranged on the housing (2); The rotor assembly further comprises a cooling device, wherein the outlet of the cooling device is in communication with the medium inlet (201), and the inlet of the cooling device is in communication with the medium outlet (202).

2. The rotor assembly according to claim 1, wherein: The rotor assembly further comprises a supercharging device, which is arranged between the cooling device and the medium inlet (201) and / or the medium outlet (202) and is used to pressurize the medium flowing into the housing (2).

3. The rotor assembly according to any one of claims 1 to 2, characterized in that: The medium inlet (201) is located at the bottom of the housing (2), and the medium outlet (202) is located at the top of the housing (2).

4. The rotor assembly according to claim 3, wherein: Two medium inlets (201) are symmetrically provided at the bottom of the shell (2), and the two medium inlets (201) are respectively close to the two ends of the shell (2) in the axial direction; two medium outlets (202) are symmetrically provided at the top of the shell (2), and the two medium outlets (202) are respectively close to the two ends of the shell (2) in the axial direction.

5. The rotor assembly according to claim 3, wherein: The medium inlet (201) and the medium outlet (202) close to the same end of the housing (2) are symmetrically arranged about the axis of the housing (2).

6. The rotor assembly according to any one of claims 1 to 2, characterized in that: The medium flowing into the bearing housing is liquid.

7. The rotor assembly according to any one of claims 1 to 2, characterized in that: An annular groove (1011) is provided on the end surface of the main body section (101), and the axis of the annular groove (1011) is collinear with the axis of the main body section (101).

8. The rotor assembly according to any one of claims 1 to 2, characterized in that: The main body section (101) is an annular structure. The inner wall of the main body section (101) is provided with at least two mounting grooves (1012) extending along the axial direction of the main body section (101) along its circumference. The shaft section (102) has a mounting protrusion (1021) adapted to the mounting groove (1012). The mounting protrusion (1021) is embedded in the mounting groove (1012) and can slide along the mounting groove (1012).

9. The rotor assembly according to claim 8, wherein: The shaft section (102) comprises a first connecting section (1022) and a second connecting section (1023), wherein the first connecting section (1022) is provided with the mounting protrusion (1021), and the second connecting section (1023) at least partially extends out of the end of the main section (101), and the outer diameter of the second connecting section (1023) is smaller than the outer diameter of the first connecting section (1022).

10. The rotor assembly according to claim 8, wherein: The rotor assembly further comprises a positioning structure, the positioning structure being used to fix the position of the shaft segment (102) within the main body segment (101), the positioning structure comprising: A first fixing block (5) is embedded in the mounting groove (1012) and is located between the two shaft sections (102); The second fixing block (6) is embedded in the installation groove (1012) and has one end abutting against the shaft section (102), while the other end extends out of the end of the main body section (101).

11. A motor, characterized in that: The invention comprises the rotor assembly according to any one of claims 1 to 10.

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