CN206237252U - Water cooling structure for motor rotor - Google Patents

Abstract

The utility model belongs to the motor field specifically provides a water-cooling structure for electric motor rotor. The utility model discloses aim at solving current motor cooling structure and can not directly cool off electric motor rotor, make electric motor rotor radiating effect poor and then influence the problem of bearing life-span. The utility model discloses a water-cooling structure includes: a cooling member; a rotating shaft provided with a blind hole; the end cover is provided with a first cavity and a second cavity, and the sealing ring is arranged between the rotating shaft and the end cover. First cavity and blind hole intercommunication, the one end of pivot is rotatably fixed to the end cover, and in the blind hole was placed to the cooling piece, the one end and the end cover fixed connection of blind hole were kept away from to the cooling piece to the both ends of the hole of cooling piece are linked together with blind hole and first cavity respectively. And cooling water is introduced into the first cavity or the second cavity, so that the motor rotor can be rapidly cooled. Therefore, the utility model discloses a water-cooling structure can cool off, cool down electric motor rotor fast.

Description

Water cooling structure for motor rotor

technical field

The utility model belongs to the field of motors and specifically provides a water cooling structure for motor rotors.

Background technique

Due to the pursuit of high power and high torque density for electric vehicle drive motors, the motor has a high temperature rise, which has a serious impact on the performance, efficiency, life and reliability of the motor. At present, electric vehicle drive motors are generally cooled by casing water cooling.

For electric vehicle drive motors, especially induction motors, due to the induced eddy current on the rotor, the rotor will generate a lot of heat during the operation of the motor, which makes the temperature rise of the rotor core very high, and the rotor The heat on the surface is quickly transferred to the bearing through heat conduction, which poses a challenge to the life of the bearing. At the same time, the speed of the driving motor is usually very high, and the maximum speed can reach 15000rpm, so that the bearing will generate a lot of heat when it runs at high speed, which will easily cause the bearing to overheat and cause the bearing to be damaged.

In order to prevent the bearing from being damaged due to overheating, the prior art usually adopts a water-cooling method for the motor casing or a fan is provided on the rotor to improve the heat dissipation of the rotor. However, the water cooling of the casing and the air cooling of the motor fan usually cannot cool down the shaft and bearing in time, and the use of the fan will not only increase the wind friction loss of the rotor, but also increase the noise of the motor.

Correspondingly, there is a need in the art for a new motor rotor cooling structure to solve the above problems.

Utility model content

In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing motor cooling structure cannot directly cool the motor rotor, so that the heat dissipation effect of the motor rotor is poor and thus affects the life of the bearing, the utility model provides a motor rotor A water-cooling structure, the water-cooling structure includes: a shaft, the shaft is provided with a blind hole along the axial direction; an end cover, which is provided at one end of the shaft, and the shaft is fixed to the shaft in a manner that can rotate around the axis An end cover; and a cooling element, the cooling element is accommodated in the blind hole; wherein, the cooling element is a hollow structure, and the hollow structure forms a first cooling channel; wherein, the cooling element and the blind hole An annular second cooling channel is formed between the inner walls, and the end of the second cooling channel away from the end cover communicates with the first cooling channel; the end cover is provided with a water inlet pipe and an outlet pipe, and the water inlet pipe It communicates with the first cooling passage, and the outlet pipe communicates with the second cooling passage.

In the preferred technical solution of the above-mentioned water-cooling structure, the end cover has a first cavity and a second cavity, and the water inlet pipe and the water outlet pipe pass through the first cavity and the second cavity respectively. Communicating with the first cooling channel and the second cooling channel.

In a preferred technical solution of the above water cooling structure, the water inlet pipe and the water outlet pipe are connected to the first cavity and the second cavity by threads.

In a preferred technical solution of the above-mentioned water-cooling structure, a sealing ring is arranged radially between the rotating shaft and the inner side of the end cover to prevent the cooling liquid from entering the inside of the motor.

In a preferred technical solution of the above water cooling structure, the sealing ring is a lip-shaped rotating sealing ring.

In a preferred technical solution of the above water cooling structure, the sealing ring is placed in the second cavity.

In a preferred technical solution of the above water cooling structure, a flange is provided on the end of the cooling element close to the end cover, and the cooling element is fixed to the end cover through the flange.

In a preferred technical solution of the above-mentioned water-cooling structure, the water-cooling structure further includes a bearing, and the bearing is sleeved on the end of the rotating shaft close to the end cover.

Those skilled in the art can understand that, in the preferred technical solution of the utility model, by setting the first cavity and the second cavity through the cooling water on the end cover, a blind hole is set in the rotating shaft, and in the blind hole The cooling element with the first cooling channel is provided so that an annular second cooling channel is formed between the cooling element and the inner wall of the blind hole, and the end of the second cooling channel away from the end cover communicates with the first cooling channel. Further, the other end of the first cooling channel and the other end of the second cooling channel communicate with the first cavity and the second cavity respectively. By passing cooling water into the first cavity, the cooling water flows through the first cooling channel and the second cooling channel, so that the cooling water can take away a large amount of heat from the rotating shaft, reduce the temperature of the rotating shaft, and further reduce the temperature of the bearing. Therefore, compared with the motor cooling structure in the prior art, the water cooling structure of the present invention can quickly reduce the temperature of the rotating shaft and the bearings on the rotating shaft, effectively improving the service life of the bearings.

Description of drawings

Fig. 1 is a schematic diagram of the effect of the water cooling structure for the motor rotor of the present invention.

List of reference signs

1. End cover; 11. First cavity; 12. Second cavity; 2. Inlet pipe; 3. Seal ring; 4. Bearing; 5. Cooling member; 51. First cooling channel; 52. Flange; 6. Rotating shaft; 61. Blind hole; 62. Second cooling channel; 7. Outlet pipe.

detailed description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the utility model, and are not intended to limit the protection scope of the utility model. For example, although the components in the drawings are drawn according to a certain ratio, the ratio is not static, and those skilled in the art can make adjustments as needed so as to adapt to specific applications.

It should be noted that, in the description of the present utility model, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be configured in a specific orientation, and operation, and therefore cannot be construed as a limitation of the utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In addition, it should be noted that, in the description of the present utility model, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, or It can be 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 intermediary, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

As shown in FIG. 1 , the water cooling structure for motor rotor of the present invention includes: end cover 1 , water inlet pipe 2 , sealing ring 3 , bearing 4 , cooling element 5 , rotating shaft 6 and water outlet pipe 7 . The end cover 1 is provided with a first cavity 11 and a second cavity 12 , the water inlet pipe 2 communicates with the first cavity 11 , and the water outlet pipe 7 communicates with the second cavity 12 . Preferably, the water inlet pipe 2 and the end cover 1, and the water outlet pipe 7 and the end cover 1 are all screwed together through water joints, or those skilled in the art can also use other connection methods to fix them together, for example, The water inlet pipe 2 and the water outlet pipe 7 are welded together with the end cover 1 respectively.

Continuing to refer to FIG. 1 , the cooling element 5 includes a first cooling channel 51 of a hollow structure and a flange 52 arranged at the lower end of the first cooling channel 51 (the lower end of the first cooling channel 51 in FIG. 1 ), and the flange 52 is provided with mounting holes (not shown). The cooling element 5 is fixedly connected to the end cover 1 through the installation hole on the flange 52 , preferably, it is fixedly connected by bolts. Further, the lower end of the first cooling passage 51 (the lower end of the first cooling passage 51 in FIG. 1 ) communicates with the first cavity 11 .

Those skilled in the art can easily understand that there can be other connection methods between the cooling element 5 and the end cover 1 except for bolt connection, for example, the flange 52 is removed, and an external thread is provided at the lower end of the cooling element 5, so that the cooling element 5 can be fixed together with the end cover 1 through threaded connection.

Continuing to refer to Fig. 1, a blind hole 61 is provided on the rotation axis of the rotating shaft 6, and most of the structure of the cooling element 5 is inserted into the blind hole 61, so that an annular space is formed between the cooling element 5 and the inner wall of the blind hole 61. The second cooling channel 62. The rotating shaft 6 is fixed coaxially with the end cover 1 through the bearing 4, so that the second cooling channel 62 communicates with the second cavity 12, and the sealing ring 3 is located in the second cavity 12 and is arranged between the rotating shaft 6 and the end cover 1 The space is used to prevent the cooling water in the second cavity 12 from entering the motor, causing corrosion and damage to the components inside the motor. Preferably, the sealing ring 3 is a lip-shaped rotating sealing ring, and the lip-shaped rotating sealing ring is a single-lip, double-lip or multi-lip rotating sealing ring. Those skilled in the art can understand that the number of sealing rings 3 is not limited to one as shown in FIG. 1 , and the number of sealing rings 3 can be two or more, so as to further seal the motor and prevent cooling water from entering the inside of the motor.

Further referring to Fig. 1, a certain distance is provided between the upper end of the cooling element 5 (the upper end of the cooling element 5 in Fig. 1) and the bottom of the blind hole 61 (the upper end of the blind hole 61 in Fig. 1), so that the first cooling The upper end of the passage 51 (the upper end of the first cooling passage 51 in FIG. 1 ) can communicate with the second cooling passage 62 .

The water cooling structure for the motor rotor of the present invention will be briefly described below in conjunction with FIG. 1 . When the rotor, the bearing 4 or the rotating shaft 6 (especially the rotating shaft 6) needs to be cooled, the water inlet pipe 2 is fed with low-temperature cooling water, and the low-temperature cooling water passes through the first cavity 11 and flows through the first cooling channel 51 and the second cooling channel in sequence 62 . The cooling water absorbs a large amount of heat from the rotating shaft 6 while flowing through the second cooling channel 62 , making its temperature rise, and the heated cooling water flows out through the second cavity 12 through the water outlet pipe 7 . It is easy for those skilled in the art to understand that the direction in and out of the cooling water is not static. The cooling water can also flow into the end cover 1 through the water outlet pipe 7 and then flow out through the water inlet pipe 2. Those skilled in the art can make adjustments according to the actual situation.

Those skilled in the art can understand that the medium for cooling the rotating shaft 6 is not limited to cooling water, it can also be other forms of cooling liquid, such as ethylene glycol and hydraulic oil, as long as it can realize the cooling function and will not affect the It only needs to corrode the contact parts such as the end cover 1, the cooling member 5 and the rotating shaft 6.

Those skilled in the art can also understand that, in order to prevent cooling water from entering the inside of the motor, the seal ring 3 and the part matched with the rotating shaft 6 can also be arranged on the outside of the motor casing, between the rotating shaft 6 and the motor casing Install a dust-proof ring to prevent dust from entering the inside of the motor.

So far, the technical solution of the utility model has been described in conjunction with the preferred implementations shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific implementations. On the premise of not departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the utility model.

Claims (8)

1. A water-cooled structure for a motor rotor, characterized in that the water-cooled structure comprises: A rotating shaft, the rotating shaft is provided with a blind hole along the axis direction; an end cover, which is provided at one end of the rotating shaft, and the rotating shaft is fixed to the end cover in a manner capable of rotating around the axis; and a cooling element accommodated in the blind hole; Wherein, the cooling member is a hollow structure, and the hollow structure forms a first cooling channel; Wherein, an annular second cooling channel is formed between the cooling element and the inner wall of the blind hole, and the end of the second cooling channel away from the end cover communicates with the first cooling channel; The end cover is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe communicates with the first cooling passage, and the water outlet pipe communicates with the second cooling passage. 2. The water-cooling structure for motor rotor according to claim 1, characterized in that, the end cover has a first cavity and a second cavity, and the water inlet pipe and the water outlet pipe respectively pass through the The first cavity and the second cavity communicate with the first cooling channel and the second cooling channel. 3 . The water cooling structure for motor rotor according to claim 2 , wherein the water inlet pipe and the water outlet pipe are respectively connected to the first cavity and the second cavity through threads. 4 . 4. The water cooling structure for the motor rotor according to claim 2, characterized in that a sealing ring is arranged radially between the rotating shaft and the inner side of the end cover to prevent the cooling liquid from entering the inside of the motor . 5. The water-cooling structure for motor rotor according to claim 4, characterized in that, the sealing ring is a lip-shaped rotating sealing ring. 6. The water-cooling structure for a motor rotor according to claim 4, wherein the sealing ring is placed in the second cavity. 7. The water-cooling structure for motor rotor according to claim 1, characterized in that, a flange is provided on the end of the cooling element close to the end cover, and the cooling element is fixed to the said cooling element through the flange. described end cap. 8 . The water cooling structure for motor rotor according to claim 1 , characterized in that, the water cooling structure further comprises a bearing, and the bearing is sleeved on the end of the rotating shaft close to the end cover.