Hollow-rotor water-cooled motor structure

Abstract

A kind of hollow rotor water-cooled motor structure belongs to motor technical field.The machine body is the cylinder with one end opening and is coaxially arranged in the shell cavity of the shell, the gap between the outer side wall of the machine body and the inner side wall of the shell is formed with cooling water flow channel, the shell is provided with cooling water inlet and cooling water outlet on the outer side wall at intervals, the stator is fixedly connected with the inner side wall of the machine body, and the rotor shaft is further included.The middle of the rotor is formed with shaft hole along the axial direction, and the input end of the rotor shaft is inserted into the shaft hole and fixedly connected with the rotor.The advantages are that the structure of the fully enclosed shell without leakage is more reliable in use, the rotor is hollow, the rotor is directly rigidly connected with the equipment driving shaft, the structure is simplified, there is no vulnerable parts, it can be maintained, and the service life is effectively prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a hollow rotor water-cooled motor structure. Background Technology

[0002] A water-cooled motor is a type of motor that uses a circulating liquid to remove the heat generated during operation. It is a key technology for solving the heat dissipation problem of high-power-density motors. The core of a water-cooled motor is to design cooling water channels outside or inside the motor, allowing the coolant to circulate within them and cool down the motor through heat exchange with the heat-generating components.

[0003] Most existing water-cooled motors, compared to traditional air-cooled motors, use water cooling for the casing instead of a cooling fan. The main structure still consists of the casing, end covers, stator, rotor, and bearings, resulting in a complex structure and high manufacturing cost. However, water-cooled motors offer advantages such as smaller size, lower noise, higher energy efficiency, and a fully enclosed structure eliminating leakage risks, making them more suitable for clean environments and quiet settings. While water-cooling technology allows for smaller and more powerful motors, it also means that bearings may need to withstand higher speeds and heavier loads. These factors inherently reduce bearing life, and the lifespan of existing water-cooled motors is largely limited by bearing life. To extend bearing life, lubricating oil is typically used for lubrication and cooling, requiring the design of complex oil circuits, sealing, and recovery systems, further complicating the motor structure.

[0004] In view of the above-mentioned existing technology, it is necessary to improve and simplify the structure of the existing water-cooled motor. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0005] The purpose of this utility model is to provide a hollow rotor water-cooled motor structure that is simple in structure, low in manufacturing cost, and long in service life.

[0006] The purpose of this utility model is achieved as follows: a hollow rotor water-cooled motor structure includes a body, a housing, a stator, and a rotor. The body is a cylindrical body with one end open and is coaxially disposed within the cavity of the housing. A cooling water flow channel is formed in the gap between the outer side wall of the body and the inner side wall of the housing. The housing has cooling water inlets and outlets spaced apart on its outer side wall. The stator is fixedly connected to the inner side wall of the body. The motor also includes a rotor shaft. A shaft hole is formed axially in the middle of the rotor. The input end of the rotor shaft extends into the shaft hole and is fixedly connected to the rotor.

[0007] In one specific embodiment of this utility model, the output end of the rotor shaft is fixedly connected to the drive shaft of the equipment.

[0008] In another specific embodiment of this utility model, the rotor shaft is the drive shaft of the equipment.

[0009] In another specific embodiment of this utility model, the rotor has limiting steps formed at both ends of the shaft hole. A pressure plate is provided in the limiting step at the end away from the equipment. The pressure plate is pressed against the end of the input end of the rotor shaft and is fastened to the rotor shaft by screws. The rotor shaft has a boss formed around the circumference at the limiting step at the end closer to the equipment. The boss abuts against the limiting step to limit the rotor shaft.

[0010] In another specific embodiment of this utility model, the shaft hole is further provided with a shaft hole keyway on its inner wall, and the rotor shaft is provided with a shaft keyway corresponding to the shaft hole keyway. The shaft hole keyway and the shaft keyway are connected by a flat key to position the rotor shaft.

[0011] In another specific embodiment of this utility model, the rotor shaft has a connecting flange at the output end for connecting and fixing with the drive shaft of the equipment.

[0012] In a further specific embodiment of this utility model, the cooling water channels are arranged in a spiral pattern at intervals along the axial direction of the body and the outer casing.

[0013] In a further specific embodiment of this utility model, the body is provided with a mounting flange on the opening side, the mounting flange forms a flange step around the central hole, and a sealing ring is provided on the outer wall of the flange step.

[0014] In yet another specific embodiment of this utility model, the body and the outer shell are welded together to form a single unit.

[0015] In yet another specific embodiment of this utility model, the gap between the body and the stator is filled and sealed with epoxy resin.

[0016] Because of the above-mentioned structure, this utility model eliminates the front and rear end covers and adopts a structure in which the outer shell and the machine body are integrally cast and sealed with epoxy resin. This fully enclosed and leak-free structure has higher reliability during use. The rotor is hollow and is directly rigidly connected to the drive shaft of the equipment, without the need for a coupling or bearing support. The structure is simplified, there are no vulnerable parts, and it can be maintenance-free, effectively extending its service life. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention before the rotor shaft is installed; Figure 3 This is a schematic diagram of the assembly cross-section of the rotor shaft and rotor described in this utility model.

[0018] In the diagram: 1. Body, 11. Cooling water inlet, 12. Cooling water outlet; 2. Outer shell; 3. Stator; 4. Rotor, 41. Shaft hole, 411. Limiting step, 412. Shaft hole keyway; 5. Cooling water flow channel; 6. Rotor shaft, 61. Pressure plate, 62. Screw, 63. Boss, 64. Shaft keyway, 65. Flat key, 66. Connecting flange; 7. Mounting flange, 71. Flange step; 8. Sealing ring; 9. Epoxy resin. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0020] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0021] Please see Figures 1 to 3 This utility model relates to a hollow rotor water-cooled motor structure, including a body 1, a housing 2, a stator 3, and a rotor 4. The body 1 is a cylindrical body with one open end and is coaxially disposed within the cavity of the housing 2. Cooling water channels 5 are formed within the gap between the outer side wall of the body 1 and the inner side wall of the housing 2. The body 1 and the housing 2 are welded together as a single unit, such that the cooling water channels 5 are arranged in a spiral pattern along the axial direction of the body 1 and the housing 2. The housing 2 has cooling water inlets 11 and cooling water outlets 12 spaced apart on its outer side wall. Cooling water enters each cooling water channel 5 through the cooling water inlets 11 and finally exits through the cooling water outlets 12. The body 1 has a mounting flange 7 on its open side. The mounting flange 7 forms a flange step 71 around a central hole. A sealing ring 8 is provided on the outer wall of the flange step 71 to seal the connection interface with the equipment.

[0022] The stator 3 is fixedly connected to the inner wall of the body 1, and the gap between the body 1 and the stator 3 is filled and sealed with epoxy resin 9, which provides higher reliability in situations where leakage-free operation is required.

[0023] In this embodiment, the rotor 4 and stator 3 can be separated, making installation convenient and quick. The rotor 4 has a hollow structure with a shaft hole 41 formed axially in the middle. A rotor shaft 6 is connected inside the shaft hole 41, and the drive shaft of the equipment is connected through the rotor shaft 6. Alternatively, the drive shaft of the equipment can be extended and used as the rotor shaft 6. The drive shaft of the equipment can be directly inserted into the shaft hole 41 to achieve connection and fixation with the rotor 4. This connection method is more convenient.

[0024] When the rotor shaft 6 is connected and fixed to the drive shaft of the equipment, the input end of the rotor shaft 6 extends into the shaft hole 41 and is fixedly connected to the rotor 4. The rotor shaft 6 has a connecting flange 66 at the output end for connection and fixation to the drive shaft of the equipment. Specifically, the rotor 4 has limiting steps 411 extended at both ends of the shaft hole 41. A pressure plate 61 is provided in the limiting step 411 at the end away from the equipment. The pressure plate 61 is pressed against the end of the input end of the rotor shaft 6 and is fastened to the rotor shaft 6 by screws 62. The rotor shaft 6 has a boss 63 formed around the circumference at the limiting step 411 at the end near the equipment. The boss 63 abuts against the limiting step 411 to limit the rotor shaft 6. Furthermore, a keyway 412 is formed on the inner wall of the shaft hole 41, and a keyway 64 is formed on the rotor shaft 6 corresponding to the keyway 412. The keyway 412 and the keyway 64 are connected by a flat key 65 to position the rotor shaft 6.

[0025] In application, the rotor 4 is first connected and fixed to the drive shaft end of the equipment, and then the body assembly consisting of the body 1, the outer shell 2, and the stator 3 is fitted and fixed to complete the installation. The rotor 4 is rigidly connected to the drive shaft of the equipment, eliminating the need for a coupling transition, bearing support, and front and rear end covers. The structure is simple, easy to maintain, and even maintenance-free, thus achieving the purpose of the invention.

Claims

1. A hollow rotor water-cooled motor structure, comprising a body (1), a shell (2), a stator (3), and a rotor (4), wherein the body (1) is a cylindrical body with one end open and coaxially disposed within the shell cavity of the shell (2), a cooling water channel (5) is formed in the gap between the outer side wall of the body (1) and the inner side wall of the shell (2), and the shell (2) is provided with cooling water inlets (11) and cooling water outlets (12) spaced apart on the outer side wall, and the stator (3) is fixedly connected to the inner side wall of the body (1), characterized in that: It also includes a rotor shaft (6), and a shaft hole (41) is formed in the middle of the rotor (4) along the axial direction. The input end of the rotor shaft (6) extends into the shaft hole (41) and is fixedly connected to the rotor (4).

2. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The output end of the rotor shaft (6) is fixedly connected to the drive shaft of the equipment.

3. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The rotor shaft (6) is the drive shaft of the equipment.

4. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The rotor (4) has a limiting step (411) formed at both ends of the shaft hole (41). A pressure plate (61) is provided in the limiting step (411) at the end away from the equipment. The pressure plate (61) is pressed on the end of the input end of the rotor shaft (6) and is fastened to the rotor shaft (6) by screws (62). The rotor shaft (6) has a boss (63) formed around the circumference at the limiting step (411) at the end close to the equipment. The boss (63) abuts against the limiting step (411) to limit the rotor shaft (6).

5. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The shaft hole (41) also has a shaft hole keyway (412) formed on its inner wall, and the rotor shaft (6) has a shaft keyway (64) corresponding to the shaft hole keyway (412). The shaft hole keyway (412) and the shaft keyway (64) are connected by a flat key (65) to position the rotor shaft (6).

6. The hollow rotor water-cooled motor structure according to claim 2, characterized in that: The rotor shaft (6) has a connecting flange (66) at the output end for connecting and fixing with the drive shaft of the equipment.

7. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The cooling water channels (5) are arranged in a spiral pattern along the axial direction of the body (1) and the outer shell (2).

8. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The body (1) is provided with a mounting flange (7) on the opening side. The mounting flange (7) forms a flange step (71) around the central hole. A sealing ring (8) is provided on the outer wall of the flange step (71).

9. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The body (1) and the outer shell (2) are welded together to form a single unit.

10. The hollow rotor water-cooled motor structure according to claim 1, characterized in that: The gap between the body (1) and the stator (3) is filled and sealed with epoxy resin (9).

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