Cooling device for a rotating shaft of an electric machine

Abstract

The application discloses a cooling device for a motor rotating shaft, which comprises a device body, a cooling cavity for storing a cooling medium, a first mounting hole and a second mounting hole opposite to each other, the first mounting hole and the second mounting hole being communicated with the cooling cavity, and the motor rotating shaft being adapted to pass through the first mounting hole and the second mounting hole; a shaft sleeve arranged in the first mounting hole and / or the second mounting hole and sleeved outside the motor rotating shaft; and a sealing assembly arranged between the shaft sleeve and the first mounting hole and / or the second mounting hole. The cooling device can effectively reduce the temperature of the motor rotating shaft at high rotating speed, improve the stability and reliability of the whole device, and avoid leakage of the cooling medium.

Description

Technical Field

[0001] This invention relates to the field of cooling equipment, and more particularly to a cooling device for motor shafts. Background Technology

[0002] With the development of technology, it is possible to manufacture basic research equipment to simulate actual working conditions, so as to conduct performance research and testing on some key components in rotating equipment. For example, some closed test chambers can be manufactured, and the components to be tested can be placed inside the test chambers to simulate some actual working conditions of high speed and high load.

[0003] The temperature inside the test chamber is typically high (generally exceeding 200 degrees Celsius), and leakage of cooling medium into the test chamber is not permitted. Increased temperature can cause failure of the support bearings in the drive or transmission components, leading to equipment damage. Currently, a method of cooling the drive or transmission components by creating microchannels in the bushing of the drive shaft is employed.

[0004] However, existing technologies have relatively low cooling capacity, and it is difficult to ensure zero leakage of the cooling medium under high-speed operating conditions, which reduces the reliability of the equipment. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a cooling device for a motor shaft that can effectively reduce the temperature of the motor shaft at high speeds, improve the stability and reliability of the overall equipment, and prevent leakage of the cooling medium.

[0006] A cooling device for a motor shaft according to the present invention comprises:

[0007] The device body defines a cooling cavity for storing a cooling medium. The device body has opposing first and second mounting holes, both of which communicate with the cooling cavity. The motor shaft is adapted to pass through the first and second mounting holes.

[0008] A bushing, wherein the bushing is disposed in the first mounting hole and / or the second mounting hole, and the bushing is sleeved on the outside of the motor shaft;

[0009] A sealing assembly is provided between the bushing and the first mounting hole and / or the second mounting hole.

[0010] According to embodiments of the present invention, the cooling device, by placing it between the motor and the test chamber, allows heat from the motor shaft end to be absorbed and carried away, ensuring that the stiffness and strength of the motor shaft's support bearing remain unchanged, thereby guaranteeing stable and efficient operation of the motor shaft. By inserting the motor shaft into the cooling chamber, the cooling medium within the chamber can exchange heat with the motor shaft in a timely manner, effectively improving the heat dissipation efficiency of the cooling device. By providing a sealing assembly to seal the gaps between the first mounting hole and the bushing, and between the second mounting hole and the bushing, leakage of the cooling medium from the location of the first or second mounting hole into the cooling chamber can be effectively prevented, thus avoiding contamination of the test chamber or the motor after leakage.

[0011] In some examples of the present invention, the device body includes:

[0012] The mounting base has a cooling groove open at one end, and the bottom wall of the cooling groove is provided with the first mounting hole;

[0013] An end cap is fixedly connected to the mounting base, and the end cap closes the open end of the cooling groove to form the cooling cavity. The end cap is provided with the second mounting hole.

[0014] In some examples of the present invention, the side wall of the mounting base is provided with a medium inlet and a medium outlet, and both the medium inlet and the medium outlet are in communication with the cooling cavity.

[0015] In some examples of the present invention, the cooling device for the motor shaft further includes a closure adapted to be movably connected to the medium inlet and / or the medium outlet to open or close the medium inlet and / or the medium outlet.

[0016] In some examples of the present invention, the cooling device for the motor shaft further includes: a liquid level detection element, the two ends of which are spaced apart along the axial direction of the mounting base and fixedly connected to the side wall of the mounting base, and both ends of the liquid level detection element are in communication with the cooling cavity.

[0017] In some examples of the present invention, the side wall of the mounting base is provided with an exhaust hole, which communicates with the cooling cavity.

[0018] In some examples of the present invention, the sealing assembly includes a first sealing assembly and a second sealing assembly, wherein the first sealing assembly is used to seal the gap between the bushing and the first mounting hole, and the second sealing assembly is used to seal the gap between the bushing and the second mounting hole.

[0019] In some examples of the present invention, the first sealing component includes:

[0020] Connectors;

[0021] A stationary ring seat, which is fixedly connected to the end of the first mounting hole opposite to the bushing via the connector;

[0022] A stationary ring, one end of which is fitted inside the stationary ring seat;

[0023] The rotating ring has one end abutting against the other end of the stationary ring away from the stationary ring seat, and the other end of the rotating ring away from the stationary ring abutting against the bushing.

[0024] In some examples of the present invention, the first sealing assembly further includes: a support member and an elastic member that abut against each other;

[0025] The end of the support member away from the elastic member abuts against the stationary ring, and the other end of the elastic member away from the support member abuts against the stationary ring seat.

[0026] In some examples of the present invention, the first sealing assembly further includes: a sealing ring,

[0027] The sealing ring is disposed between the stationary ring seat and the stationary ring;

[0028] And / or, the sealing ring is disposed between the stationary ring seat and the inner bottom wall of the cooling chamber;

[0029] And / or, the sealing ring is disposed between the moving ring and the motor shaft.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the cooling device in use according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the cooling device according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the first sealing assembly in the cooling device according to an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10-Cooling device;

[0037] 20 - Motor; 21 - Motor shaft;

[0038] 30 - Test chamber; 31 - Test moving ring; 32 - Test stationary ring;

[0039] 40 - Circulating pump station; 41 - Piping;

[0040] 100-Device body;

[0041] 110 - Cooling chamber; 120 - First mounting hole; 130 - Second mounting hole; 140 - Mounting base; 150 - End cap;

[0042] 141-Cooling tank; 142-Medium inlet; 143-Medium outlet; 144-Exhaust port; 145-Nozzle;

[0043] 200-shaft sleeve;

[0044] 300 - Sealing assembly;

[0045] 310 - First sealing assembly; 311 - Connector; 312 - Stationary ring seat; 313 - Stationary ring; 314 - Rotating ring; 315 - Support; 316 - Elastic element; 317 - Sealing ring;

[0046] 3120 - Reception slot;

[0047] 3141 - Coating;

[0048] 320 - Second sealing assembly;

[0049] 400 - Enclosure;

[0050] 500-Liquid level detection component. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] The terms "first," "second," and "third" (if applicable) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0055] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0056] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0057] Figure 1 This is a schematic diagram illustrating the usage state of the cooling device 10 according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of the cooling device 10 according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the first sealing assembly 310 in the cooling device 10 according to an embodiment of the present invention. Figures 1-3As shown, a cooling device 10 for a motor shaft 21 according to an embodiment of the present invention includes: a device body 100, the device body 100 defining a cooling cavity 110 for storing a cooling medium, the device body 100 having opposing first mounting holes 120 and second mounting holes 130, both the first mounting holes 120 and the second mounting holes 130 communicating with the cooling cavity 110, and the motor shaft 21 adapted to pass through the first mounting holes 120 and the second mounting holes 130; a bushing 200, the bushing 200 being disposed within the first mounting hole 120 and / or the second mounting hole 130, and the bushing 200 being sleeved on the outside of the motor shaft 21; and a sealing assembly 300, the sealing assembly 300 being disposed between the bushing 200 and the first mounting hole 120 and / or the second mounting hole 130.

[0058] Specifically, such as Figure 1 As shown, the cooling device 10 can be installed between the motor 20 and the test chamber 30. The motor shaft 21 can be inserted into the test chamber 30 via the cooling device 10 and fixedly connected to the test rotating ring 31 inside the test chamber 30, thereby driving the test rotating ring 31 to rotate relative to the test stationary ring 32. During high-speed rotation and friction, the test rotating ring 31 and the test stationary ring 32 generate a large amount of heat, which can be transferred to the end of the motor shaft 21. The cooling device 10 can continuously absorb and remove the heat from the end of the motor shaft 21, ensuring that the stiffness and strength of the support bearing (not shown in the figure) of the motor shaft 21 do not change, thus ensuring the stable and efficient operation of the motor shaft 21.

[0059] Furthermore, one end of the device body 100 can be fixedly connected to the motor housing (not shown in the figure), and the other end of the device body 100 away from the motor housing can be fixedly connected to the test chamber 30. This arrangement is such that by placing the cooling device 10 between the motor 20 and the test chamber 30, the heat at the end of the motor shaft 21 can be absorbed and carried away.

[0060] The cooling medium can be a cooling liquid or a cooling gas. The cooling liquid can be cooling oil or cooling water; however, this embodiment of the invention does not specifically limit the cooling medium. The following embodiment uses cooling oil as an example for explanation. The cooling chamber 110 can be enclosed inside the device body 100, and the cooling medium can flow orderly inside the cooling chamber 110 so that the cooling medium can absorb and remove heat.

[0061] The first mounting hole 120, the bushing 200, and the second mounting hole 130 can be arranged opposite to each other, and their central axes can coincide. The bushing 200 can be disposed within the cooling chamber 110. The bushing 200 can be fitted into the first mounting hole 120, the second mounting hole 130, or both. This embodiment of the invention does not specifically limit the specific arrangements. This arrangement allows the motor shaft 21 to be inserted into the cooling chamber 110 sequentially through the second mounting hole 130, the bushing 200, and the first mounting hole 120. The outer side of the bushing 200, facing away from the motor shaft 21, can contact the cooling medium for heat exchange. The cooling medium can absorb and carry away the heat transferred from the motor shaft 21 to the bushing 200.

[0062] The sealing assembly 300 can be disposed on the inner bottom wall of the cooling chamber 110. The sealing assembly 300 can be located between the first mounting hole 120 and the end of the bushing 200, thus sealing the gap between the first mounting hole 120 and the bushing 200. The sealing assembly 300 can also be disposed on the inner top wall of the cooling chamber 110, between the second mounting hole 130 and the outer side wall of the bushing 200, thus sealing the gap between the second mounting hole 130 and the bushing 200. This effectively prevents the cooling medium from leaking out of the cooling chamber 110 from the location of the first mounting hole 120 or the second mounting hole 130, thereby preventing contamination of the test chamber 30 or the motor 20 after leakage.

[0063] According to the embodiment of the present invention, the cooling device 10, by being disposed between the motor 20 and the test chamber 30, allows the heat at the end of the motor shaft 21 to be absorbed and carried away, ensuring that the stiffness and strength of the support bearing of the motor shaft 21 remain unchanged, thereby ensuring stable and efficient operation of the motor shaft 21. By inserting the motor shaft 21 into the cooling chamber 110, the cooling medium within the cooling chamber 110 can exchange heat with the motor shaft 21 in a timely manner, effectively improving the heat dissipation efficiency of the cooling device 10. By providing a sealing assembly 300, the sealing assembly 300 can seal the gaps between the first mounting hole 120 and the bushing 200, and between the second mounting hole 130 and the bushing 200, effectively preventing the cooling medium from leaking from the cooling chamber 110 at the location of the first mounting hole 120 or the second mounting hole 130, thereby avoiding contamination of the test chamber 30 or the motor 20 after leakage.

[0064] Please continue reading Figure 2As shown, in some embodiments of the present invention, the device body 100 includes: a mounting base 140, the mounting base 140 having a cooling groove 141 with one end open, the bottom wall of the cooling groove 141 being provided with a first mounting hole 120; and an end cap 150, the end cap 150 being fixedly connected to the mounting base 140, the end cap 150 closing the open end of the cooling groove 141 to form a cooling chamber 110, and the end cap 150 being provided with a second mounting hole 130.

[0065] Specifically, the mounting base 140 can be a cylindrical structure, and the central axes of the cooling groove 141 and the mounting base 140 can coincide. The end cap 150 can be placed over the open end of the cooling groove 141, and the end cap 150 can be fixedly connected to the mounting base 140. The specific connection method can be welding, riveting, or threaded connection; however, this embodiment of the invention does not specifically limit this. For example, the end cap 150 and the mounting base 140 can be connected via... Figure 2 The threaded connection shown is used for fixed connection, which is configured so that the end cap 150 can close the cooling groove 141 to form the cooling chamber 110.

[0066] Furthermore, a sealing groove (not shown in the figure) can be provided at the end of the mounting base 140 opposite to the end cap 150, or at the end of the end cap 150 opposite to the mounting base 140, or simultaneously between the ends of the mounting base 140 and the end cap 150 (not shown in the figure). This embodiment of the invention does not specifically limit the specific application of this feature. Simultaneously, a sealing ring 317 can be provided within the sealing groove, and the shape and size of the sealing ring 317 and the sealing groove are mutually matched. This arrangement can effectively improve the sealing performance between the end cap 150 and the mounting base 140, effectively preventing leakage of cooling medium from between the end cap 150 and the mounting base 140.

[0067] Please continue reading Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the side wall of the mounting base 140 is provided with a medium inlet 142 and a medium outlet 143, and both the medium inlet 142 and the medium outlet 143 are connected to the cooling chamber 110.

[0068] Specifically, the medium inlet 142 and the medium outlet 143 can respectively penetrate the sidewall of the cooling tank 141, and both the medium inlet 142 and the medium outlet 143 can be connected to the cooling cavity 110. The depth direction of the cooling cavity 110 can be... Figure 2In the direction indicated by Z, along the depth direction of the cooling cavity 110, the distance between the medium inlet 142 and the inner bottom wall of the cooling cavity 110 is greater than the distance between the medium outlet 143 and the inner bottom wall of the cooling cavity 110. This arrangement allows the cooling medium to flow into the cooling cavity 110 from the medium outlet 143 and out of the cooling cavity 110 from the medium outlet 143, so that the cooling medium can circulate and carry away heat, thereby effectively improving the heat dissipation efficiency of the cooling device 10.

[0069] Furthermore, the medium inlet 142 and the medium outlet 143 can be connected to the circulating pump station 40 through the pipeline 41, respectively. The circulating pump station 40 can drive the cooling medium to flow so that the cooling medium continuously circulates within the cooling chamber 110.

[0070] Furthermore, a nozzle 145 can be installed at the medium inlet 142. The nozzle 145 can spray the cooling medium evenly onto the outer wall of the bushing 200. This arrangement can improve the heat exchange efficiency between the cooling medium and the bushing 200.

[0071] Please continue reading Figure 2 As shown, in some embodiments of the present invention, the cooling device 10 further includes a closure 400, which is adapted to be movably connected to the medium inlet 142 and / or the medium outlet 143 to open or close the medium inlet 142 and / or the medium outlet 143.

[0072] Specifically, the sealing element 400 can be a screw with external threads, and the medium inlet 142 and the medium outlet 143 can each have internal threads. The sealing element 400 can be threaded to the medium inlet 142, the medium outlet 143, or both. This embodiment of the invention does not specifically limit the specific connection method. This arrangement, where the sealing element 400 is connected to the medium inlet 142 or the medium outlet 143 via a threaded connection, effectively prevents the cooling medium from leaking from either the medium inlet 142 or the medium outlet 143.

[0073] Please continue reading Figure 2 As shown, in some embodiments of the present invention, the cooling device 10 further includes a liquid level detection element 500, the two ends of which are spaced apart along the axial direction of the mounting base 140 and fixedly connected to the side wall of the mounting base 140, and both ends of the liquid level detection element 500 are in communication with the cooling cavity 110.

[0074] Specifically, along the axial direction of the mounting base 140, the axial direction is... Figure 2In the direction indicated by Z, the two ends of the liquid level detection element 500 can be fixedly connected to the side wall of the mounting base 140 at intervals. The two ends of the liquid level detection element 500 can be connected to the cooling cavity 110 through quick-connect taps (not shown in the figure). The distances between the two opposite ends of the liquid level detection element 500 and the bottom wall of the cooling cavity 110 are different. This setting allows the user to monitor the liquid level of the cooling medium in the cooling cavity 110 in real time through the liquid level detection element 500, based on the principle of communicating vessels.

[0075] Please continue reading Figure 2 As shown, in some embodiments of the present invention, the side wall of the mounting base 140 is provided with an exhaust hole 144, which communicates with the cooling chamber 110.

[0076] Specifically, the vent 144 can be located at the end of the mounting base 140 opposite to the end cover 150. The vent 144 can penetrate the side wall of the mounting base 140, allowing the cooling chamber 110 to communicate with the external environment. This arrangement allows the air pressure inside and outside the cooling chamber 110 to be balanced. Simultaneously, the vent 144 can serve as an emergency cooling medium discharge port in extreme situations (e.g., a failure of the circulating pump station 40) that cause a rapid rise in the liquid level within the cooling chamber 110, effectively protecting the motor bearings (not shown in the figure) from being wetted and contaminated by the cooling medium.

[0077] Please continue reading Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the sealing assembly 300 includes a first sealing assembly 310 and a second sealing assembly 320. The first sealing assembly 310 is used to seal the gap between the bushing 200 and the first mounting hole 120, and the second sealing assembly 320 is used to seal the gap between the bushing 200 and the second mounting hole 130.

[0078] Specifically, the first sealing assembly 310 can be a backflow pump seal structure. The first sealing assembly 310 can be disposed between the end of the sealing sleeve 200 and the first mounting hole 120. This arrangement seals the gap between the sleeve 200 and the first mounting hole 120, thereby preventing leakage of the cooling medium from between them. The second sealing assembly 320 can be a labyrinth seal structure. The second sealing assembly 320 can be disposed between the second mounting hole 130 and the outer wall of the sleeve 200. This arrangement seals the gap between the sleeve 200 and the second mounting hole 130, thereby preventing leakage of the cooling medium from between them.

[0079] Furthermore, through the joint cooperation of the second sealing assembly 320 and the bushing 200, the cooling medium that climbs upward along the bushing 200 can be thrown out toward the periphery of the cooling chamber 110, thereby effectively consuming the climbing energy of the cooling medium and preventing the cooling medium from leaking between the second mounting hole 130 and the bushing 200.

[0080] Please continue reading Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the first sealing assembly 310 includes: a connector 311; a stationary ring seat 312, which is fixedly connected to one end of the first mounting hole 120 opposite to the bushing 200 via the connector 311; a stationary ring 313, one end of which is sleeved inside the stationary ring seat 312; and a rotating ring 314, one end of which abuts against the other end of the stationary ring 313 away from the stationary ring seat 312, and the other end of the rotating ring 314 away from the stationary ring 313 abuts against the bushing 200.

[0081] Specifically, the connector 311 can be a screw, and there can be multiple connectors 311. The stationary ring seat 312, stationary ring 313, and moving ring 314 can all be annular structures, and the central axes of the stationary ring seat 312, stationary ring 313, moving ring 314, and the first mounting hole 120 can coincide with each other. One end of the stationary ring seat 312 can fit against the inner bottom wall of the cooling cavity 110, and multiple connectors 311 can be spaced apart along the circumferential direction of the first mounting hole 120. In this arrangement, the stationary ring seat 312 can be fixedly connected to one end of the first mounting hole 120 by the connectors 311.

[0082] Furthermore, an annular receiving groove 3120 can be provided at the other end of the stationary ring seat 312 away from the first mounting hole 120. The shape and size of the receiving groove 3120 and the stationary ring 313 can be matched with each other. One end of the stationary ring 313 can be movably fitted into the receiving groove 3120. This arrangement allows the stationary ring 313 to be movably connected to the other end of the stationary ring seat 312 away from the first mounting hole 120.

[0083] Furthermore, the rotating ring 314 can be sleeved on the outside of the motor shaft 21. One end of the rotating ring 314 can abut against the other end of the stationary ring 313 away from the stationary ring seat 312, and the other end of the rotating ring 314 away from the stationary ring 313 can abut against the bushing 200. The motor shaft 21 can drive the rotating ring 314 to rotate relative to the stationary ring 313. This arrangement can form a rigid fluid film between the end faces of the stationary ring 313 and the rotating ring 314. The local high pressure generated between the end faces can seal the cooling medium or cause the cooling medium to flow backward, thereby achieving the effect of zero leakage of the cooling medium.

[0084] Furthermore, a plating layer 3141 can be provided on the end face where the moving ring 314 abuts against the stationary ring 313. The thickness of the plating layer 3141 can be between 0.5 mm and 2 mm, and the material of the plating layer 3141 can be chromium oxide (Cr₂O₃) or aluminum oxide (Al₂O₃). Micron-level textured grooves (not shown in the figure) can be provided on the surface of the moving ring 314. The textured grooves can be in the form of spiral grooves, O-grooves, T-grooves, or "tree"-shaped grooves, for example, spiral grooves. The depth of the spiral grooves can be between 2 μm and 20 μm; the number of spiral grooves can be between 6 and 30; the groove-to-dam ratio of the spiral grooves can be between 0.5 and 0.8; the groove width ratio of the spiral grooves can be between 0.4 and 0.7; and the spiral angle of the spiral grooves can be between 10 degrees and 20 degrees. For example, the depth of the spiral grooves can be 5 μm, the number of grooves can be 12, the groove-to-dam ratio can be 0.7, and the groove width ratio can be 0.5. This configuration allows the motor shaft 21 to drive the rotating ring 314 to rotate at high speeds, enabling the cooling medium to enter the micron-sized textured grooves. It can also generate localized high pressure with the dam area accumulation to push away the stationary ring 313, thereby forming a rigid fluid film between the end faces of the rotating ring 314 and the stationary ring 313. This improves the sealing effect between the stationary ring 313 and the rotating ring 314 and effectively reduces the end face friction between the stationary ring 313 and the rotating ring 314.

[0085] Please continue reading Figures 1-3 As shown, in some embodiments of the present invention, the first sealing assembly 310 further includes a support member 315 and an elastic member 316 that abut against each other; one end of the support member 315 away from the elastic member 316 abuts against the stationary ring 313, and the other end of the elastic member 316 away from the support member 315 abuts against the stationary ring seat 312.

[0086] Specifically, the adjacent ends of the support member 315 and the elastic member 316 can abut against each other, and the support member 315 and the elastic member 316 can be jointly disposed in the receiving groove 3120. The other end of the elastic member 316 away from the support member 315 abuts against the inner bottom wall of the receiving groove 3120, and the support member 315 abuts between the elastic member 316 and the stationary ring 313. This arrangement allows the elastic member 316 to apply a preload to the stationary ring 313 so that the stationary ring 313 can fit tightly against the moving ring 314. The support member 315 can be used to balance the preload applied by the elastic member 316.

[0087] Furthermore, the elastic element 316 can be a wave spring, and the number of wave springs can be one. The elastic element 316 can also be a regular spring, and the number of regular springs can be between 3 and 20.

[0088] Please continue reading Figure 3As shown, in some embodiments of the present invention, the first sealing assembly 310 further includes: a sealing ring 317 (i.e., the sealing ring in the above embodiments), the sealing ring 317 being disposed between the stationary ring seat 312 and the stationary ring 313; and / or, the sealing ring 317 being disposed between the stationary ring seat 312 and the inner bottom wall of the cooling chamber 110; and / or, the sealing ring 317 being disposed between the rotating ring 314 and the motor shaft 21.

[0089] Specifically, the sealing ring 317 can be an O-ring, and there can be multiple sealing rings 317. O-ring grooves can be correspondingly provided between the stationary ring 313 seat 312 and the inner bottom wall of the cooling chamber 110. The O-ring grooves can be located on the stationary ring seat 312 or the inner bottom wall of the cooling chamber 110, and the sealing ring 317 is disposed within the O-ring groove. This arrangement can effectively improve the sealing performance between the stationary ring seat 312 and the inner bottom wall of the cooling chamber 110. Alternatively, O-ring grooves can be correspondingly provided between the stationary ring 313 and the stationary ring seat 312. The O-ring grooves can be located on the stationary ring 313 or the stationary ring seat 312, and the sealing ring 317 is disposed within the O-ring groove. This arrangement can effectively improve the sealing performance between the stationary ring 313 and the stationary ring seat 312. An O-ring groove can also be provided between the moving ring 314 and the motor shaft 21. The O-ring groove can be located on the stationary ring 313 or the motor shaft 21, and the sealing ring 317 is set in the O-ring groove. This arrangement can effectively improve the sealing performance between the moving ring 314 and the motor shaft 21.

[0090] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0092] In the description of this invention, "a plurality of" means two or more.

[0093] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0094] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A cooling device for a motor shaft, characterized in that, include: The device body defines a cooling cavity for storing a cooling medium. The device body has opposing first and second mounting holes, both of which communicate with the cooling cavity. The motor shaft is adapted to pass through the first and second mounting holes. A bushing, wherein the bushing is disposed in the first mounting hole and / or the second mounting hole, and the bushing is sleeved on the outside of the motor shaft; A sealing assembly is provided between the bushing and the first mounting hole and / or the second mounting hole; The sealing assembly includes a first sealing assembly and a second sealing assembly. The first sealing assembly is used to seal the gap between the bushing and the first mounting hole, and the second sealing assembly is used to seal the gap between the bushing and the second mounting hole. The first sealing assembly includes: Connectors; A stationary ring seat, which is fixedly connected to the end of the first mounting hole opposite to the bushing via the connector; A stationary ring, one end of which is fitted inside the stationary ring seat; A rotating ring, one end of which abuts against the other end of the stationary ring away from the stationary ring seat, and the other end of the rotating ring away from the stationary ring abuts against the bushing; the surface of the rotating ring is provided with micron-level textured grooves; The first sealing assembly further includes: a support member and an elastic member that abut against each other; The end of the support member away from the elastic member abuts against the stationary ring, and the other end of the elastic member away from the support member abuts against the stationary ring seat.

2. The cooling device for a motor shaft according to claim 1, characterized in that, The device body includes: The mounting base has a cooling groove open at one end, and the bottom wall of the cooling groove is provided with the first mounting hole; An end cap is fixedly connected to the mounting base, and the end cap closes the open end of the cooling groove to form the cooling cavity. The end cap is provided with the second mounting hole.

3. The cooling device for a motor shaft according to claim 2, characterized in that, The side wall of the mounting base is provided with a medium inlet and a medium outlet, and both the medium inlet and the medium outlet are connected to the cooling cavity.

4. The cooling device for a motor shaft according to claim 3, characterized in that, Also includes: A closure element adapted to be movably connected to the medium inlet and / or the medium outlet to open or close the medium inlet and / or the medium outlet.

5. The cooling device for a motor shaft according to claim 2, characterized in that, Also includes: A liquid level detection element, wherein the two ends of the liquid level detection element are spaced apart along the axial direction of the mounting base and are fixedly connected to the side wall of the mounting base, and both ends of the liquid level detection element are in communication with the cooling cavity.

6. The cooling device for a motor shaft according to claim 2, characterized in that, The side wall of the mounting base is provided with an exhaust hole, which is connected to the cooling cavity.

7. The cooling device for a motor shaft according to claim 1, characterized in that, The first sealing assembly further includes: a sealing ring, The sealing ring is disposed between the stationary ring seat and the stationary ring; And / or, the sealing ring is disposed between the stationary ring seat and the inner bottom wall of the cooling chamber; And / or, the sealing ring is disposed between the moving ring and the motor shaft.

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