High-speed oil cooling motor capable of cooling bearing
By designing the cylinder shell passage and the bearing cooling channel in a high-speed oil-cooled motor, the cooling liquid flows through the front bearing, cylinder shell and rear bearing cooling channels in turn to cool the bearings, solving the problem of leakage risks in the bearing cooling and lubrication in the prior art, and achieving the effect of simplifying the system structure, reducing costs and improving reliability.
Patent Information
- Application Number
- CN202510242125.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-04-18
Smart Images
Figure CN119853344A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of motors, and in particular to a high-speed oil-cooled motor capable of cooling bearings. Background Art
[0002] A motor is a device that converts electrical energy into mechanical energy. The motor is mainly composed of a stator, a rotor and a bearing. The bearing is installed between the rotor and the stator to support the rotor shaft, so that the rotor can rotate smoothly and ensure the relative motion accuracy between the rotor and the stator. The bearing is a key component for the stable operation of the motor. The motor is usually equipped with a front bearing and a rear bearing, which are located at the front and rear ends of the motor respectively. As a key component of the motor, the working state of the bearing directly affects the overall performance and reliability of the equipment. During the operation of the bearing, heat will be generated due to factors such as friction. If the heat cannot be effectively dissipated, the bearing temperature will rise, which will cause a series of problems. Therefore, a reasonable bearing heat dissipation method is crucial. In the related art, the performance requirements for motors in some fields are not high, and there is no design for the heat dissipation structure of the bearings. However, in the field of aviation electrification, in order to improve efficiency and power density, the operating speed and operating temperature of aviation motors are usually high, which puts forward high requirements on the lubrication, cooling and temperature resistance of motor bearings.
[0003] In the prior art, in order to meet the technical requirements of high speed, aviation motors usually use circulating oil lubrication or oil-gas lubrication systems. Circulating oil lubrication is achieved by using a high-speed oil jet to directly spray onto the bearing to cool and lubricate the bearing. The oil-gas lubrication system uses a compressed air jet containing oil droplets to spray onto the bearing, where the oil droplets play a lubricating role and the compressed air plays a cooling role. In these two solutions, the cooling medium needs to enter the bearing cavity and directly contact the bearing, which poses a risk of leakage. Therefore, the bearing cavity has higher sealing requirements, and high-speed oil seals need to be set at both ends of the bearing, and an auxiliary system needs to be set outside the motor to provide the required functions, which not only increases the overall quality of the system, but also increases the complexity and cost of the system.
[0004] In view of this, the present invention is proposed. Summary of the invention
[0005] In order to solve one of the above technical problems, the present invention provides a high-speed oil-cooled motor capable of cooling bearings.
[0006] The present invention adopts the following technical solutions:
[0007] A high-speed oil-cooled motor capable of cooling a bearing, comprising:
[0008] A cylinder shell, wherein a cylinder shell passage is arranged on the cylinder shell;
[0009] A front end cover, the front end cover is arranged at one end of the barrel shell along the length direction, the front end cover is provided with a front bearing cooling channel, and the front bearing cooling channel is connected to the barrel shell channel;
[0010] A rear end cover is arranged at the other end of the cylinder along the length direction, and a rear bearing cooling channel is arranged on the rear end cover, and the rear bearing cooling channel is connected to the cylinder shell channel.
[0011] Optionally, a front bearing cavity is provided in the middle of the front end cover, and the front bearing cooling channel extends along the circumference of the front bearing cavity;
[0012] A rear bearing cavity is arranged in the middle of the rear end cover, and the rear bearing cooling channel extends along the circumference of the rear bearing cavity.
[0013] Optionally, the front bearing cooling channel includes a plurality of first annular channels, each of which is arranged in sequence along the thickness direction of the front end cover, each of which is located on the outside of the front bearing cavity, each of which is connected in sequence, or each of which is connected in parallel to the cylinder shell channel.
[0014] Optionally, the cross-section of the first annular channel is rectangular, and the width direction of the rectangle is in the same direction as the thickness direction of the front end cover.
[0015] Optionally, the rear bearing cooling channel includes a plurality of second annular channels, each of which is arranged in sequence along the thickness direction of the rear end cover, each of which is located on the outside of the rear bearing cavity, each of which is connected in sequence, or each of which is connected in parallel to the cylinder shell channel.
[0016] Optionally, a front end liquid inlet channel is provided on the front end cover, the front end liquid inlet channel extends in the radial direction of the front end cover, and the front end liquid inlet channel is connected to the front bearing cooling channel;
[0017] The front end cover or the cylinder shell is provided with a cooling oil inlet connected to the front end liquid inlet channel.
[0018] Optionally, a rear end liquid inlet channel is provided on the rear end cover, the rear end liquid inlet channel extends radially along the rear end cover, and two ends of the rear end liquid inlet channel are respectively connected to the cylinder shell channel and the rear bearing cooling channel.
[0019] Optionally, the high-speed oil-cooled motor capable of cooling the bearing comprises a stator, and the stator is arranged inside the cylindrical shell;
[0020] A stator cooling channel is provided on the stator;
[0021] The stator cooling channel extends along the length direction of the cylinder shell;
[0022] The stator cooling passage is communicated with the rear bearing cooling passage.
[0023] Optionally, a front end cavity and a rear end cavity are respectively provided at two ends of the stator in the cylindrical shell;
[0024] The rear end cavity is connected to the rear bearing cooling channel;
[0025] The cylinder shell is provided with a cooling oil outlet connected to the front end cavity;
[0026] Two ends of the stator cooling channel are respectively connected to the front end cavity and the rear end cavity.
[0027] Optionally, the front end cavity and the rear end cavity are both annular cavities extending along the circumference of the rotor of the high-speed oil-cooled motor.
[0028] By adopting the above technical solution, the present application has the following beneficial effects:
[0029] The high-speed oil-cooled motor of the present application that can cool the bearings cools the bearings. After the coolant enters the motor, the coolant flows through the front bearing cooling channel, the barrel shell channel and the rear bearing cooling channel in sequence to cool the bearings. The bearings do not need to be designed with additional cooling devices and are not in direct contact with the coolant, eliminating the risk of coolant leakage from the bearing cavity. The bearings can be lubricated with grease or lifetime lubricated sealed bearings, and there is no need to set up a circulating oil lubrication or oil-gas lubrication system, which reduces the sealing requirements of the bearing cavity, simplifies the system structure, improves the reliability of the system, and reduces the complexity and cost of the system.
[0030] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:
[0032] Figure 1 A front view of one side of the front end cover of a high-speed oil-cooled motor capable of cooling the bearing provided in an embodiment of the present application;
[0033] Figure 2 for Figure 1 Middle AA section view;
[0034] Figure 3 for Figure 1 Middle BB section view;
[0035] Figure 4 for Figure 1 Middle CC section view;
[0036] Figure 5 A partial cross-sectional view of a high-speed oil-cooled motor capable of cooling bearings provided in an embodiment of the present application;
[0037] Figure 6 A schematic diagram of the flow direction of the coolant of a high-speed oil-cooled motor capable of cooling the bearings provided in an embodiment of the present application.
[0038] In the figure: cylinder shell 1, cylinder shell channel 11, cooling oil outlet 12, front end cavity 13, rear end cavity 14, front end cover 2, front bearing cooling channel 21, first annular channel 211, front end liquid inlet channel 22, front end liquid outlet channel 23, rear end cover 3, rear bearing cooling channel 31, rear end liquid inlet channel 32, rear end liquid outlet channel 33, front bearing 4, rear bearing 5, cooling oil inlet a, stator 6, stator cooling channel 61, rotor 7, oil separator 8.
[0039] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.
[0041] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0043] See also Figures 1 to 6As shown, the embodiment of the present application provides a high-speed oil-cooled motor capable of cooling bearings, comprising: a barrel shell 1, a front end cover 2 and a rear end cover 3. The barrel shell 1 is provided with a barrel shell passage 11. The front end cover 2 is provided at one end of the barrel shell 1 along the length direction, and a front bearing cooling passage 21 is provided on the front end cover 2, and the front bearing cooling passage 21 is connected to the barrel shell passage 11. The rear end cover 3 is provided at the other end of the barrel along the length direction, and a rear bearing cooling passage 31 is provided on the rear end cover 3, and the rear bearing cooling passage 31 is connected to the barrel shell passage 11. The high-speed oil-cooled motor of the present application that can cool the bearings cools the bearings. After the coolant enters the motor, it flows through the front bearing cooling channel 21, the shell channel 11 and the rear bearing cooling channel 31 in sequence to cool the bearings. The bearings do not need to be designed with additional cooling devices and are not in direct contact with the coolant, eliminating the risk of coolant leakage from the bearing cavity. The bearings can be lubricated with grease or lifetime lubricated sealed bearings, and there is no need to set up a circulating oil lubrication or oil-gas lubrication system, which reduces the sealing requirements of the bearing cavity, simplifies the system structure, improves the reliability of the system, and reduces the complexity and cost of the system.
[0044] A front bearing cavity is arranged in the middle of the front end cover 2, and the front bearing cooling channel 21 extends along the circumference of the front bearing cavity. A rear bearing cavity is arranged in the middle of the rear end cover 3, and the rear bearing cooling channel 31 extends along the circumference of the rear bearing cavity. The front bearing cooling channel 21 is annular and extends along the outer side of the front bearing cavity. When the coolant flows through the front bearing cooling channel 21, the front bearing 4 can be effectively cooled. The front bearing cooling channel 21 is not connected to the front bearing cavity, and the coolant flowing through the front bearing cooling channel will not directly contact the front bearing 4, eliminating the risk of coolant leakage from the bearing cavity. The rear bearing cooling channel 31 is annular and extends along the outer side of the front bearing cavity. When the coolant flows through the rear bearing cooling channel 31, the rear bearing 5 can be effectively cooled. The rear bearing cooling channel 31 is not connected to the rear bearing cavity, and the coolant flowing through the rear bearing cooling channel 31 will not directly contact the rear bearing 5, eliminating the risk of coolant leakage from the bearing cavity.
[0045] In a possible implementation, the front bearing cooling channel 21 includes a plurality of first annular channels 211, each of which is sequentially arranged along the thickness direction of the front end cover 2, each of which is located outside the front bearing cavity, and each of which is sequentially connected, or each of which is connected in parallel to the shell channel 11. The sequential connection of the first annular channels 211 means that the first annular channels 211 are connected in series, and two adjacent first annular channels 211 are connected, and the coolant will pass through the first annular channels 211 in sequence and finally flow into the shell channel 11. The parallel connection of the first annular channels 211 means that the first annular channels 211 are simultaneously connected to the shell channel 11, and the coolant will pass through the first annular channels 211 in multiple ways and finally converge to the shell channel 11. The setting of the first annular channels 211 ensures the structural strength while increasing the heat exchange area of the bearing cooling channel. The front bearing cooling channel 21 may also include only one annular channel with a larger cross section, but the material requirements for making the front bearing cooling channel 21 are higher, and a certain structural strength needs to be achieved. However, compared with the design of multiple first annular channels 211, the processing difficulty of a larger annular channel is lower, and the heat exchange area in the front bearing cooling channel 21 is reduced, and the cooling effect on the front bearing 4 is reduced. However, since the front cooling channel is closer to the front bearing 4, the cooling effect is still better than that in the prior art.
[0046] The cross section of the first annular channel 211 is rectangular, and the width direction of the rectangle is in the same direction as the thickness direction of the front end cover 2. That is, the cross section of the first annular channel 211 formed by cutting through a surface where the rotation axis is located is rectangular. More first annular channels 211 can be arranged along the thickness direction of the front end cover 2, which increases the heat exchange area, is more conducive to improving the heat exchange efficiency of the front bearing 4, and has a significant cooling effect on the front bearing 4.
[0047] The rear bearing cooling channel 31 includes a plurality of second annular channels, each of which is sequentially arranged along the thickness direction of the rear end cover 3, each of which is located outside the rear bearing cavity, and each of which is sequentially connected, or each of which is connected in parallel to the barrel shell channel 11. Each of the second annular channels is sequentially connected, which means that each of the second-shaped channels is connected in series, and two adjacent second annular channels are connected, and the coolant flows through each of the second annular channels in sequence from the barrel shell channel 11. Each of the second annular channels is connected in parallel, which means that each of the second annular channels is simultaneously connected to the barrel shell channel 11, and the coolant flows through each of the second annular channels from the barrel shell channel 11 in multiple ways at the same time. The setting of each of the second annular channels ensures the structural strength while also increasing the heat exchange area of the rear bearing cooling channel. The structure of the second annular channel is the same as that of the first annular channel 211.
[0048] In a possible implementation, the front end cover 2 is provided with a front end liquid inlet channel 22, the front end liquid inlet channel 22 extends in the radial direction of the front end cover 2, and the front end liquid inlet channel 22 is connected to the front bearing cooling channel 21. The front end cover 2 or the barrel shell 1 is provided with a cooling oil inlet a connected to the front end liquid inlet channel 22. When the first annular channels 211 are connected in series, one of the first annular channels 211 located at the end is connected to the front end liquid inlet channel 22, and the other first annular channels 211 are connected in sequence. When the first annular channels 211 are connected in parallel, the area of the transverse surface of the front end liquid inlet channel 22 is larger, and the first annular channels 211 can be connected to the front end liquid inlet channel 22 at the same time. The front end cover 2 is also provided with the front end liquid outlet channel 23, the front end liquid outlet channel 23 extends in the radial direction of the front end cover 2, and the front end liquid outlet channel 23 can be arranged on the front end cover 2 at a position opposite to the front end liquid inlet channel 22. The front end liquid outlet channel 23 is connected between the front bearing cooling channel 21 and the shell channel 11. After the coolant enters the motor from the cooling oil inlet a, it flows through the front end liquid inlet channel 22, the front bearing cooling channel 21, the front end liquid outlet channel 23 and the shell channel 11 in sequence to cool the front bearing 4.
[0049] The rear end cover 3 is provided with a rear end liquid inlet channel 32, which extends in the radial direction of the rear end cover 3, and the two ends of the rear end liquid inlet channel 32 are respectively connected to the barrel channel 11 and the rear bearing cooling channel 31. The rear end cover 3 is also provided with a rear end liquid outlet channel 33, which extends in the radial direction of the rear end cover 3, and the rear end liquid outlet channel 33 can be arranged on the rear end cover 3 at a position opposite to the rear end liquid inlet channel 32. The rear end liquid inlet channel 32 is connected to the rear bearing cooling channel 31.
[0050] In a possible implementation, the high-speed oil-cooled motor capable of cooling the bearing includes a stator 6, the stator 6 is arranged inside the cylindrical shell 1, a stator cooling channel 61 is arranged on the stator 6, the stator cooling channel 61 extends along the length direction of the cylindrical shell 1, and the stator cooling channel 61 is connected to the rear bearing cooling channel 31. The stator cooling channel 61 can be a channel with a larger cross section, or can be composed of a plurality of channels with smaller cross sections connected in parallel.
[0051] The front end cavity 13 and the rear end cavity 14 are respectively arranged at the two ends of the stator 6 in the cylindrical shell 1. The rear end cavity 14 is connected to the rear bearing cooling channel 31. The cylindrical shell 1 is provided with a cooling oil outlet 12 connected to the front end cavity 13. The two ends of the stator cooling channel 61 are respectively connected to the front end cavity 13 and the rear end cavity 14. The rear end cavity 14 is connected to the rear end liquid outlet channel 33. The coolant enters the rear end liquid inlet channel 32 from the cylindrical shell channel 11, and enters the rear bearing cooling channel 31, the rear end liquid outlet channel 33, the rear end cavity 14, the stator cooling channel 61 and the front end cavity 13 in sequence, and finally flows out from the cooling oil outlet 12. When the coolant flows through the rear end cavity 14 and the front end cavity 13, it also has a heat dissipation effect on the inside of the motor.
[0052] The front end cavity 13 and the rear end cavity 14 are both annular cavities extending along the circumference of the rotor of the high-speed oil-cooled motor. The annular cavity has a large flow area, which can effectively increase the contact area and has a good cooling effect.
[0053] The flow trajectory of the coolant of the high-speed oil-cooled motor that can cool the bearing of the present application is: cooling oil inlet a→front end liquid inlet channel 22→front bearing cooling channel 21→front end liquid outlet channel 23→cylinder shell channel 11→rear end liquid inlet channel 32→rear bearing cooling channel 31→rear end liquid outlet channel 33→rear end cavity 14→stator cooling channel 61→front end cavity 13→cooling oil outlet 12. Among them, the front end liquid inlet channel 22, the front end liquid outlet channel 23 and the cylinder shell channel 11 can be replaced by a hose or a hard pipe located outside the cylinder shell channel 11 to simplify the processing difficulty of the cylinder shell 1. In this case, the heat exchange between the cooling oil and the bearing mainly occurs in the bearing cooling channel, and this design does not affect the cooling effect of the bearing. The high-speed oil-cooled motor that can cool the bearing also includes an oil separator ring 8, which is arranged between the stator 6 and the rotor 7.
[0054] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.
Claims
1. A high-speed oil-cooled motor capable of cooling bearings, characterized in that: include: A cylinder shell, wherein a cylinder shell passage is arranged on the cylinder shell; A front end cover, the front end cover is arranged at one end of the barrel shell along the length direction, the front end cover is provided with a front bearing cooling channel, and the front bearing cooling channel is connected to the barrel shell channel; A rear end cover is arranged at the other end of the cylinder along the length direction, and a rear bearing cooling channel is arranged on the rear end cover, and the rear bearing cooling channel is connected to the cylinder shell channel.
2. The high-speed oil-cooled motor capable of cooling the bearing according to claim 1, characterized in that: A front bearing cavity is arranged in the middle of the front end cover, and the front bearing cooling channel extends along the circumference of the front bearing cavity; A rear bearing cavity is arranged in the middle of the rear end cover, and the rear bearing cooling channel extends along the circumference of the rear bearing cavity.
3. The high-speed oil-cooled motor capable of cooling the bearings according to claim 2, characterized in that: The front bearing cooling channel includes a plurality of first annular channels, each of which is arranged in sequence along the thickness direction of the front end cover, each of which is located on the outside of the front bearing cavity, each of which is connected in sequence, or each of which is connected in parallel to the barrel shell channel.
4. The high-speed oil-cooled motor capable of cooling the bearings according to claim 3, characterized in that: The cross section of the first annular channel is rectangular, and the width direction of the rectangle is in the same direction as the thickness direction of the front end cover.
5. The high-speed oil-cooled motor capable of cooling the bearings according to claim 2, characterized in that: The rear bearing cooling channel includes a plurality of second annular channels, each of which is arranged in sequence along the thickness direction of the rear end cover, each of which is located outside the rear bearing cavity, and each of which is connected in sequence, or each of which is connected in parallel to the cylinder shell channel.
6. The high-speed oil-cooled motor capable of cooling the bearing according to claim 1, characterized in that: A front end liquid inlet channel is provided on the front end cover, the front end liquid inlet channel extends in the radial direction of the front end cover, and the front end liquid inlet channel is connected to the front bearing cooling channel; The front end cover or the cylinder shell is provided with a cooling oil inlet connected to the front end liquid inlet channel.
7. The high-speed oil-cooled motor capable of cooling the bearings according to claim 1, characterized in that: The rear end cover is provided with a rear end liquid inlet channel, the rear end liquid inlet channel extends in the radial direction of the rear end cover, and two ends of the rear end liquid inlet channel are respectively connected to the cylinder shell channel and the rear bearing cooling channel.
8. The high-speed oil-cooled motor capable of cooling the bearings according to claim 1, characterized in that: It includes a stator, and the stator is arranged inside the cylindrical shell; A stator cooling channel is provided on the stator; The stator cooling channel extends along the length direction of the cylinder shell; The stator cooling passage is communicated with the rear bearing cooling passage.
9. The high-speed oil-cooled motor capable of cooling the bearings according to claim 8, characterized in that: The cylinder shell is provided with a front end cavity and a rear end cavity at both ends of the stator; The rear end cavity is connected to the rear bearing cooling channel; The cylinder shell is provided with a cooling oil outlet connected to the front end cavity; Two ends of the stator cooling channel are respectively connected to the front end cavity and the rear end cavity.
10. The high-speed oil-cooled motor capable of cooling the bearings according to claim 9, characterized in that: The front end cavity and the rear end cavity are both annular cavities extending along the circumferential direction of the rotor of the high-speed oil-cooled motor.