A high-speed oil-cooled motor housing with high heat dissipation

Abstract

This invention proposes a high-heat-dissipation, high-speed oil-cooled motor housing, including a tailstock, a housing, and a port flange. The housing is fixedly connected to the front of the tailstock, and the port flange is fixedly connected to the front end of the housing. A spiral groove is formed on the inner wall of the housing, and a spiral oil pipe is embedded in this groove. The surface of the spiral oil pipe facing the inside of the housing is concave. The advantages of this invention are: the spiral oil pipe's surface matches the concave surface of the inner sleeve, ensuring full contact and effectively transferring motor heat to the cooling oil, resulting in thorough heat exchange. Simultaneously, the spiral path of the spiral oil pipe forces the cooling oil to flow across the entire heating area, reducing stagnant zones. The optimized spiral oil pipe flow channel design promotes turbulence, forcing the cooling oil to flow along the spiral path across the entire motor heating area, eliminating axial temperature difference anomalies. Breaking the laminar boundary layer enhances heat transfer and increases the heat transfer coefficient, thereby effectively improving the motor's oil-cooling performance.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a high-speed oil-cooled motor housing with high heat dissipation. Background Technology

[0002] High-speed electric motors are increasingly widely used in modern industrial equipment (such as precision machine tool spindles, high-power power tools, compressors, high-speed fans, and electric vehicle drives). Their continuous performance improvements pose a significant challenge to heat dissipation capabilities. If the enormous heat generated by the stator windings and core during motor operation cannot be dissipated in time, it will lead to excessively high motor temperatures, severely reducing working efficiency, accelerating the aging of insulation materials, causing magnet demagnetization, and even resulting in equipment shutdown and damage.

[0003] Oil cooling, as a highly efficient heat dissipation method, is gaining increasing attention in high-power-density motors due to its advantages such as large heat capacity, good insulation, and direct contact cooling. However, traditional oil-cooled motor housing designs still have significant heat dissipation bottlenecks and shortcomings when meeting the demands of high-speed operation.

[0004] Insufficient heat exchange efficiency: Limited surface contact: Traditional cooling oil channels (such as simple circumferential annular oil grooves or axial straight oil channels) are often bare and flat, limiting the contact area with the motor's heating element (stator), resulting in an unsatisfactory heat transfer rate.

[0005] Laminar flow dominates, with high boundary layer thermal resistance: When cooling oil flows in smooth straight channels or shallow channels, it easily forms a laminar flow state, resulting in a thick thermal boundary layer. The fluid velocity within the boundary layer is low and it mainly flows in a laminar manner, resulting in significant thermal resistance and hindering the efficient transfer of heat from the high-temperature wall surface to the mainstream cooling oil.

[0006] Low turbulence: Simple flow channel designs struggle to effectively disrupt the laminar boundary layer and promote strong fluid disturbances (turbulence), resulting in a low overall heat transfer coefficient. Therefore, a high-heat-dissipation, high-speed oil-cooled motor housing is proposed to address this issue. Utility Model Content

[0007] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0008] Therefore, one objective of this utility model is to provide a high-heat-dissipation, high-speed oil-cooled motor housing to solve the problems mentioned in the background art and overcome the shortcomings of the prior art.

[0009] To achieve the above objectives, one embodiment of the present invention provides a high-heat-dissipation high-speed oil-cooled motor housing, including a tailstock, a housing, and a port flange. The housing is fixedly connected to the front side of the tailstock, and the port flange is fixedly connected to the front end of the housing.

[0010] The inner wall of the outer casing is provided with a spiral groove and a spiral oil pipe is embedded in the groove;

[0011] The surface of the spiral oil pipe facing the inner side of the outer shell is concave, and an inner sleeve is fixedly connected to the surface of the spiral oil pipe;

[0012] The inner side of the inner sleeve has several grooves.

[0013] A connector is fixedly connected to the top of the outer casing, and the output end of the connector is connected to the end of the spiral oil pipe;

[0014] A return oil pipe is fixedly connected to one side of the joint, and the end of the return oil pipe is fixedly connected to the other end of the spiral oil pipe.

[0015] The return oil pipe is fixedly connected to the top surface of the housing, and the top of the connector is fixedly connected to an oil inlet and an oil return port.

[0016] Preferably, in any of the above embodiments, the tailstock is connected to the outer casing by a number of screws, and the connection between the tailstock and the outer casing is filled with a sealing ring.

[0017] The above technical solution involves CNC machining a continuous spiral groove channel on the inner wall of the outer shell and embedding a spiral oil pipe. Cooling oil enters through the oil inlet of the connector and then enters the spiral oil pipe. The oil after heat exchange is output from the other end of the spiral oil pipe and then flows back through the return oil pipe and return oil inlet.

[0018] A spiral oil pipe is fixedly connected to an inner sleeve with several grooves. The inner sleeve has a large heat-receiving area, which, combined with the concave surface of the spiral oil pipe, ensures full contact with the inner sleeve, effectively transferring heat from the motor to the cooling oil for efficient heat exchange. Simultaneously, the spiral path of the oil pipe forces the cooling oil to flow across the entire heating area, reducing stagnant zones. The optimized spiral oil pipe flow channel design promotes turbulence, forcing the cooling oil to flow along the spiral path across the entire motor heating area, eliminating axial temperature difference anomalies. Breaking the laminar boundary layer enhances heat transfer and increases the heat transfer coefficient, thereby effectively improving the motor's oil cooling performance.

[0019] Preferably, of any of the above solutions, the port flange is integrally formed with the outer shell, and the spiral oil pipe is made of copper.

[0020] The above technical solution is adopted: The device consists of the following main structure: a tailstock, an outer shell, and port flanges connected axially in sequence. The tailstock is fixed to the outer shell with screws, and a sealing ring is used to fill the connection. The outer shell and port flanges are integrally cast.

[0021] Spiral flow channel structure: Continuous spiral grooves are precision-machined into the inner wall of the outer casing using CNC machining. The depth and width of the grooves match the cross-section of the spiral oil pipe. The grooves extend to the interface areas at both ends of the outer casing.

[0022] Cooling core component: Spiral oil pipe: Made of high thermal conductivity copper tubing bent into a spiral shape, tightly pressed into the groove of the outer casing, and fixed by multi-point laser welding. Its surface facing the inside of the motor is designed as a concave arc surface to increase the contact area with the inner sleeve.

[0023] Inner sleeve: A cylindrical sleeve made of copper alloy, fitted onto the surface of the spiral oil pipe and fixed by diffusion welding. The inner side of the inner sleeve has axially / radially staggered grooves (such as fin grooves, honeycomb grooves), with a groove depth of 0.5-2mm, increasing the total area by more than 200% compared to the flat surface.

[0024] Oil circulation system:

[0025] Connector: Fixed to the top of the housing, its oil inlet is connected to the external oil supply system, and its oil outlet is connected to the spiral oil pipe inlet through a rigid pipe.

[0026] Return oil pipe: a rigid pipe that connects the spiral oil pipe outlet to the return oil interface, with O-rings used to seal both interfaces to prevent leakage.

[0027] Preferably, in any of the above schemes, the spiral oil pipe is first pressed into the inner wall of the outer casing and then fixed by multi-point laser welding, and the spiral oil pipe is rigidly connected to the joint and the spiral oil pipe to the return oil pipe.

[0028] Preferably, in any of the above solutions, the connection between the spiral oil pipe and the joint, and between the spiral oil pipe and the return oil pipe, is sealed with an O-ring, and the inner sleeve is made of copper alloy.

[0029] Preferably, in any of the above embodiments, the inner sleeve is located inside the outer shell, and the inner sleeve is diffusely welded together with the spiral oil pipe.

[0030] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0031] This high-speed oil-cooled motor housing features a spiral oil pipe with a fixed inner sleeve containing several grooves. The inner sleeve has a large heat-receiving area, and the spiral oil pipe's surface matches the concave surface of the inner sleeve, ensuring full contact and efficient heat transfer from the motor to the cooling oil. Simultaneously, the spiral path of the oil pipe forces the cooling oil to flow across the entire heat-generating area, reducing stagnant zones. The optimized spiral oil pipe flow channel design promotes turbulence, forcing the cooling oil along the spiral path across the entire motor's heat-generating area and eliminating axial temperature aberrations. This breaks down the laminar boundary layer, enhancing heat transfer and increasing the heat transfer coefficient, thereby effectively improving the motor's oil-cooling performance.

[0032] Additional aspects and advantages of this 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

[0033] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is a front view structural diagram of the present utility model;

[0036] Figure 3 This is a schematic diagram of the spiral oil pipe of this utility model;

[0037] Figure 4 This is a schematic diagram of the internal structure of the outer shell of this utility model.

[0038] In the diagram: 1-tailstock, 2-outer shell, 3-port flange, 4-spiral oil pipe, 5-inner sleeve, 6-tank, 7-connector, 8-return oil pipe, 9-oil inlet port, 10-return oil port. Detailed Implementation

[0039] The embodiments of this utility model 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 intended to explain this utility model, and should not be construed as limiting this utility model.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] like Figure 1-4 As shown, the housing of this high-heat-dissipation high-speed oil-cooled motor includes a tailstock 1, a housing 2, and a port flange 3. The housing 2 is fixedly connected to the front of the tailstock 1, and the port flange 3 is fixedly connected to the front end of the housing 2.

[0042] The inner wall of the outer casing 2 is provided with a spiral groove and a spiral oil pipe 4 is embedded in the groove;

[0043] The surface of the spiral oil pipe 4 facing the inside of the outer casing 2 is concave, and an inner sleeve 5 is fixedly connected to the surface of the spiral oil pipe 4.

[0044] The inner side of the inner sleeve 5 has several grooves 6;

[0045] A connector 7 is fixedly connected to the top of the outer casing 2, and the output end of the connector 7 is connected to the end of the spiral oil pipe 4;

[0046] One side of the connector 7 is fixedly connected to the return oil pipe 8, and the end of the return oil pipe 8 is fixedly connected to the other end of the spiral oil pipe 4.

[0047] The return oil pipe 8 is fixedly connected to the top surface of the outer casing 2, and the top of the connector 7 is fixedly connected to the oil inlet port 9 and the oil return port 10.

[0048] Example 1: The tailstock 1 and the outer shell 2 are connected by several screws, and the connection between the tailstock 1 and the outer shell 2 is filled with a sealing ring. The port flange 3 is integrally formed with the outer shell 2, and the spiral oil pipe 4 is made of copper. The spiral oil pipe 4 is first pressed into the inner wall of the outer shell 2 and then fixed by multi-point laser welding. The spiral oil pipe 4 is rigidly connected to the connector 7 and the return oil pipe 8. The connection between the spiral oil pipe 4 and the connector 7, and the spiral oil pipe 4 and the return oil pipe 8, is sealed with an O-ring. The inner sleeve 5 is made of copper alloy. The inner sleeve 5 is located inside the outer shell 2 and is diffusely welded to the spiral oil pipe 4.

[0049] Example 2: A continuous spiral groove channel is directly CNC machined on the inner wall of the outer shell 1, and a spiral oil pipe 4 is embedded therein. Cooling oil enters through the oil inlet 9 of the connector 7 and then enters the spiral oil pipe 4. The oil after heat exchange is output from the other end of the spiral oil pipe 4 and then flows back through the return oil pipe 8 and the return oil interface 10.

[0050] This device consists of the following main structure: Tailstock 1, outer shell 2, and port flange 3, which are axially connected in sequence. Tailstock 1 is fixed to outer shell 2 with screws, and the connection is filled with a sealing ring. Outer shell 2 and port flange 3 are integrally cast.

[0051] Spiral flow channel structure: Continuous spiral grooves are precision machined into the inner wall of the outer shell 2 using CNC machining. The depth and width of the grooves match the cross-section of the spiral oil pipe 4. The grooves extend to the interface areas at both ends of the outer shell 2.

[0052] Cooling core component: Spiral oil pipe 4: Made of high thermal conductivity copper pipe bent into a spiral shape, tightly pressed into the groove of the outer casing 2, and fixed by multi-point laser welding. Its surface facing the inside of the motor is designed as a concave arc surface to increase the contact area with the inner sleeve 5.

[0053] Inner sleeve 5: A copper alloy cylindrical sleeve fitted onto the surface of the spiral oil pipe 4 and fixed by diffusion welding. The inner side of the inner sleeve 5 has axially / radially staggered grooves 6 (such as fin grooves or honeycomb grooves), with a groove depth of 0.5-2mm, and the total area is more than 200% larger than that of the flat surface.

[0054] Oil circulation system:

[0055] Connector 7: Fixed to the top of the outer casing 2, its oil inlet 9 is connected to the external oil supply system, and its oil outlet is connected to the inlet of the spiral oil pipe 4 through a rigid pipe.

[0056] Return oil pipe 8: Rigid pipeline, connecting the outlet of spiral oil pipe 4 and return oil interface 10, with O-rings used for leak prevention at both interfaces.

[0057] The working principle of this utility model is as follows:

[0058] Cooling oil circulation path: external cooling oil → oil inlet 9 → connector 7 → spiral oil pipe 4 inlet → spiral flow channel (fully absorbs heat from the outer casing) → spiral oil pipe 4 outlet → return oil pipe 8 → return oil inlet 10 → external cooler.

[0059] Heat transfer process: heat from motor stator → groove 6 of inner sleeve 5 (enlarged heat absorption surface) → diffusion weld interface → concave surface of spiral oil pipe 4 → turbulent flow of cooling oil (enhanced thermal convection).

[0060] Manufacturing method of this motor housing: Housing preparation: Step 1: Cast aluminum alloy housing 2 and port flange 3 as an integral blank. Step 2: CNC machine the inner wall spiral groove.

[0061] Oil pipe installation: Step 3: Press the copper spiral oil pipe 4 into the groove and fix it at 3 points per thread pitch using laser welding. Step 4: Assemble the connector 7 and return oil pipe 8, and braze and seal the hard connection with an O-ring.

[0062] Inner sleeve integration: Step 5: After pre-grooving the inner sleeve 5, insert the spiral oil pipe 4 and perform vacuum diffusion welding at 850℃ to form a metallurgical bond. Step 6: Overall helium leak test (pressure 1.5MPa)

[0063] Compared with the prior art, the present invention has the following advantages:

[0064] The housing of this high-speed oil-cooled motor features a spiral oil pipe 4 with an inner sleeve 5 containing several grooves 6 fixedly connected to its surface. The inner sleeve 5 has a large heat-receiving area, and combined with the concave surface of the spiral oil pipe 4, it ensures full contact with the inner sleeve 5, effectively transferring motor heat to the cooling oil for efficient heat exchange. Simultaneously, the spiral path of the spiral oil pipe 4 forces the cooling oil to flow across the entire heating area, reducing stagnant zones. The optimized flow channel design of the spiral oil pipe 4 promotes turbulence, forcing the cooling oil to flow along the spiral path across the entire motor heating area, eliminating axial temperature difference anomalies. This breaks down the laminar boundary layer, enhancing heat transfer and increasing the heat transfer coefficient, thereby effectively improving the motor's oil-cooling performance.

Claims

1. A high-speed oil-cooled motor housing with high heat dissipation, characterized in that, It includes a tailstock (1), a housing (2), and a port flange (3). The front of the tailstock (1) is fixedly connected to the housing (2), and the front end of the housing (2) is fixedly connected to the port flange (3). The inner wall surface of the outer shell (2) is provided with a spiral groove and a spiral oil pipe (4) is embedded in the groove. The surface of the spiral oil pipe (4) facing the inside of the outer shell (2) is concave, and an inner sleeve (5) is fixedly connected to the surface of the spiral oil pipe (4). The inner side of the inner sleeve (5) is provided with a number of grooves (6); The top of the outer shell (2) is fixedly connected to a connector (7), and the output end of the connector (7) is connected to the end of the spiral oil pipe (4). One side of the connector (7) is fixedly connected to a return oil pipe (8), and the end of the return oil pipe (8) is fixedly connected to the other end of the spiral oil pipe (4). The return oil pipe (8) is fixedly connected to the top surface of the outer shell (2), and the top of the connector (7) is fixedly connected to the oil inlet (9) and the oil return interface (10).

2. The high-heat dissipation, high-speed oil-cooled motor housing as described in claim 1, characterized in that: The tailstock (1) and the outer shell (2) are connected by several screws, and the connection between the tailstock (1) and the outer shell (2) is filled with a sealing ring.

3. The high-heat dissipation, high-speed oil-cooled motor housing as described in claim 2, characterized in that: The port flange (3) is integrally formed with the outer shell (2), and the spiral oil pipe (4) is made of copper.

4. The high-heat dissipation, high-speed oil-cooled motor housing as described in claim 3, characterized in that: The spiral oil pipe (4) is first pressed into the inner wall of the outer shell (2) and then fixed by multi-point laser welding. The spiral oil pipe (4) is rigidly connected to the joint (7) and the spiral oil pipe (4) is rigidly connected to the return oil pipe (8).

5. The high-heat dissipation, high-speed oil-cooled motor housing as described in claim 4, characterized in that: The connection between the spiral oil pipe (4) and the connector (7), and between the spiral oil pipe (4) and the return oil pipe (8) is sealed with an O-ring, and the inner sleeve (5) is made of copper alloy.

6. The high-heat dissipation, high-speed oil-cooled motor housing as described in claim 5, characterized in that: The inner sleeve (5) is located inside the outer shell (2), and the inner sleeve (5) is diffusely welded together with the spiral oil pipe (4).

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