Rotor cooling structure and motor

Abstract

The rotor cooling structure is characterized in that a plurality of first liquid inlets and a plurality of first liquid outlets are formed in one surface, facing a second end plate, of a first end plate, the plurality of first liquid inlets are arranged at intervals along the circumferential direction, the plurality of first liquid outlets are arranged at intervals along the circumferential direction, and the first liquid inlets and the first liquid outlets are not communicated with each other; a plurality of second liquid inlets and a plurality of second liquid outlets are formed in the face, facing the first end plate, of the second end plate, the number of the first liquid outlets is the same as that of the second liquid inlets, the number of the second liquid outlets is the same as that of the first liquid inlets, the second liquid inlets are formed in the circumferential direction at intervals, and the second liquid outlets are formed in the circumferential direction at intervals; the second liquid inlet is not communicated with the second liquid outlet; the first liquid inlet is respectively communicated with the first liquid inlet channel and the second liquid outlet, and the second liquid inlet is respectively communicated with the first liquid inlet channel and the first liquid outlet. According to the utility model, the motor can be comprehensively cooled, and the cooling effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor field especially relates to a rotor cooling structure and motor. BACKGROUND

[0002] In new energy three electric systems (namely battery, motor and electric control), in order to meet the high requirement of market to power density and system speed, cooling system is upgraded from water cooling to oil cooling, realizes that oil liquid is shared by reducer and motor.Under this improvement, the oil circuit system design of motor's rotor and stator also needs to make corresponding oil circuit system cooling to motor, rotor adopts the hollow structure of shaft to supply oil to stator, realizes oil circuit circulation through the slot around end plate and end plate shape.In order to ensure the dynamic balance of rotor (namely for the rotor component in rotating machinery, through adjusting its mass distribution, so that the rotor does not produce unnecessary vibration when rotating), the end plate of both sides of rotor is usually designed to share the same part, namely the end plate structure of both sides of rotor is same, which leads to the limitation of oil groove design.At present, the oil groove on end plate is one inlet and two outlets, namely one liquid inlet on each end plate corresponds two liquid outlets on another end plate, therefore when motor rotates forward and reversely, due to the action of centrifugal force and inertia, cooling liquid mainly concentrates in one side, that is, only flows out from one liquid outlet, leading to only half of stator to be effectively cooled, and poor cooling effect. SUMMARY

[0003] The utility model discloses a rotor cooling structure and motor, can carry out comprehensive cooling to motor, improve cooling effect.

[0004] To solve the above technical problem, the embodiment of the utility model discloses a rotor cooling structure, comprising:

[0005] Rotor, the rotor includes first liquid inlet channel, the first liquid inlet channel extends along the axial direction, and the axial direction both sides of the rotor are equipped with first end plate and second end plate respectively;

[0006] The side of the first end plate facing the second end plate is provided with a plurality of first liquid inlets and a plurality of first liquid outlets, the plurality of first liquid inlets are arranged along the circumferential direction, the plurality of first liquid outlets are arranged along the circumferential direction, and the first liquid inlet and the first liquid outlet are not communicated with each other;

[0007] The side of the second end plate facing the first end plate is provided with a plurality of second liquid inlets and a plurality of second liquid outlets, the number of first liquid outlets is same with the number of second liquid inlets, the number of second liquid outlets is same with the number of first liquid inlets, the plurality of second liquid inlets are arranged along the circumferential direction, the plurality of second liquid outlets are arranged along the circumferential direction, and the second liquid inlet and the second liquid outlet are not communicated with each other.

[0008] The first liquid inlet is connected with the first liquid channel and the second liquid outlet respectively, and the second liquid inlet is connected with the first liquid channel and the first liquid outlet respectively.

[0009] According to the above technical scheme, the first end plate is provided with a plurality of first liquid inlets and a plurality of first liquid outlets, the second end plate is provided with a plurality of second liquid inlets and a plurality of second liquid outlets, the number of the first liquid outlets is the same as that of the second liquid inlets, and the number of the second liquid outlets is the same as that of the first liquid inlets, that is, one first liquid inlet on the first end plate corresponds to one second liquid outlet on the second end plate, so as to realize one inlet and one outlet on the first end plate (that is, the cooling liquid enters from one first liquid inlet on the first end plate and can only exit from one second liquid outlet on the second end plate) and one inlet and one outlet on the second end plate (that is, the cooling liquid enters from one second liquid inlet on the second end plate and can only exit from one first liquid outlet on the first end plate).

[0010] The first liquid inlet is connected with the first liquid channel and the second liquid outlet respectively, and the second liquid inlet is connected with the first liquid channel and the first liquid outlet respectively.

[0011] Similarly, the second liquid inlet is connected with the first liquid channel and the first liquid outlet on the rotor respectively, the cooling liquid can flow from the first liquid channel to the second liquid inlet of the second end plate, and then flow from the second liquid inlet of the second end plate to the first liquid outlet of the first end plate, even under the action of centrifugal force in the rotation process of the rotor, since the cooling liquid has only one direction of flow (that is, enters from the second liquid inlet of the second end plate and exits from the first liquid outlet of the first end plate), the above path (that is, enters from the second liquid inlet of the second end plate and exits from the first liquid outlet of the first end plate) can be realized, the cooling liquid flows from the second end plate to the first end plate, and the stator between the first end plate and the second end plate is cooled.

[0012] Compared with the prior art, the first liquid inlet of the first end plate is provided with a bifurcated route and is communicated with the two second liquid outlets of the second end plate, that is, the first end plate is one inlet and two outlets (that is, the cooling liquid can flow from one first liquid inlet of the first end plate to the two second liquid outlets of the second end plate), when the rotor rotates, the centrifugal force thereof can cause the cooling oil to flow from the first liquid inlet to only one of the bifurcated routes after flowing from the first liquid passage, and the other route is little or not entered, that is, the cooling oil can only flow out from one of the first liquid outlets of the first end plate, so that the stator cannot be comprehensively cooled, and only the stator located in one of the bifurcated routes can be cooled. However, in the embodiment, the number of the first liquid inlet of the first end plate is the same as that of the second liquid outlet of the second end plate, that is, the cooling liquid flows from the first liquid inlet of the first end plate and then flows out from the second liquid outlet of the second end plate, and the intermediate part is not bifurcated, that is, the first end plate is one inlet and one outlet, so that the problem that the stator cannot be comprehensively cooled in the prior art can be avoided.

[0013] Similarly, the second liquid inlet of the second end plate is provided with a bifurcated route and is communicated with the two first liquid outlets of the first end plate, that is, the second end plate is one inlet and two outlets (that is, the cooling liquid can flow from one second liquid inlet of the second end plate to the two first liquid outlets of the first end plate), when the rotor rotates, the centrifugal force thereof can cause the cooling oil to flow from the first liquid inlet to only one of the bifurcated routes after flowing from the first liquid passage, and the other route is little or not entered, that is, the cooling oil can only flow out from one of the first liquid outlets of the first end plate, so that the stator cannot be comprehensively cooled, and only the stator located in one of the bifurcated routes can be cooled. However, in the embodiment, the number of the second liquid inlet of the second end plate is the same as that of the first liquid outlet of the first end plate, that is, the cooling liquid flows from the second liquid inlet of the second end plate and then flows out from the first liquid outlet of the first end plate, and the intermediate part is not bifurcated, that is, the second end plate is one inlet and one outlet, so that the problem that the stator cannot be comprehensively cooled in the prior art can be avoided.

[0014] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a rotor cooling structure, one side of the first end plate faces the second end plate and is provided with a plurality of first grooves, the plurality of first grooves are arranged at intervals along the circumference, one end of the first groove is the first liquid inlet, and the first groove is communicated with the first liquid passage and the second liquid outlet.

[0015] By adopting the above technical scheme, one end of the first groove is the first liquid inlet, the first liquid passage and the second liquid outlet are communicated through the first groove, so that the cooling liquid can flow from the first liquid passage of the rotor to the first liquid inlet of the first end plate and then flow out from the second liquid outlet of the second end plate, and the cooling of the stator between the first end plate and the second end plate is completed.

[0016] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a rotor cooling structure, and the first groove is arc-shaped.

[0017] The first groove is arc-shaped, so that, when the rotor rotates, the cooling liquid is subjected to a force deviating from the radial direction under the action of centrifugal force, that is, the path becomes arc-shaped and fits the shape of the first groove, and therefore the cooling liquid in the first liquid inlet channel of the rotor can flow to the first groove better.

[0018] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a rotor cooling structure, and one side of the second end plate facing the first end plate is provided with a plurality of second grooves, the plurality of second grooves are arranged at intervals along the circumferential direction, one end of the second groove is the second liquid inlet, and the second groove connects the first liquid inlet channel and the first liquid outlet.

[0019] One end of the second groove is the second liquid inlet, the first liquid inlet channel and the first liquid outlet are connected through the second groove, so that the cooling liquid can flow from the first liquid inlet channel of the rotor to the second liquid inlet of the second end plate and then flow out from the first liquid outlet of the first end plate, and the cooling of the stator between the second end plate and the first end plate is completed.

[0020] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a rotor cooling structure, and the second groove is arc-shaped.

[0021] The second groove is arc-shaped, so that, when the rotor rotates, the cooling liquid is subjected to a force deviating from the radial direction under the action of centrifugal force, that is, the path becomes arc-shaped and fits the shape of the second groove, and therefore the cooling liquid in the first liquid inlet channel of the rotor can flow to the second groove better.

[0022] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a rotor cooling structure, and one side of the first end plate facing the second end plate is provided with a plurality of third grooves, the plurality of third grooves are arranged at intervals along the circumferential direction, the third groove and the first groove are not connected, one end of the third groove is the first liquid outlet, and the third groove is connected with the second groove.

[0023] According to the technical scheme, the third groove on the first end plate is not communicated with the first groove, one end of the first groove is a first liquid inlet, one end of the third groove is a first liquid outlet, the first liquid inlet and the first liquid outlet are not communicated with each other, the third groove is communicated with the second groove, one end of the second groove is a second liquid inlet, the first liquid outlet of the first end plate is communicated with the second liquid inlet of the second end plate, and the number of the second liquid inlet is same as that of the first liquid outlet, so that one-in and one-out of the second end plate is realized (namely, entering from one second liquid inlet of the second end plate and flowing out from one first liquid outlet of the first end plate).

[0024] According to another specific embodiment of the utility model, the utility model discloses a rotor cooling structure, one side of the second end plate facing the first end plate is provided with a plurality of fourth grooves, the plurality of fourth grooves are spaced apart along the circumference, the fourth groove is not communicated with the second groove, one end of the fourth groove is the second liquid outlet, and the fourth groove is communicated with the first groove.

[0025] According to the technical scheme, the fourth groove on the second end plate is not communicated with the second groove, one end of the second groove is a second liquid inlet, one end of the fourth groove is a second liquid outlet, the second liquid inlet and the second liquid outlet are not communicated with each other, the fourth groove is communicated with the first groove, one end of the first groove is a first liquid inlet, the second liquid outlet of the second end plate is communicated with the first liquid inlet of the first end plate, and the number of the first liquid inlet is same as that of the second liquid outlet, so that one-in and one-out of the first end plate is realized (namely, entering from one first liquid inlet of the first end plate and flowing out from one second liquid outlet of the second end plate).

[0026] The utility model discloses an electric machine, including stator and the rotor cooling structure of any one in above -mentioned embodiment, the stator surrounds the rotor, be equipped with a plurality of first cooling channel and a plurality of second cooling channel in the stator, the first cooling channel links up the first liquid inlet with the second liquid outlet, and the second cooling channel links up the first liquid outlet with the second liquid inlet.

[0027] According to the technical scheme, the first cooling channel links up the first liquid inlet with the second liquid outlet, the first groove links up the first liquid channel with the second liquid outlet, so that the cooling liquid in the rotor enters the first liquid inlet from the first liquid channel, then enters the first cooling channel from the first groove, and finally goes out from the second liquid outlet. Similarly, the second cooling channel links up the first liquid outlet with the second liquid inlet, and the second groove links up the first liquid channel with the first liquid outlet, so that the cooling liquid in the rotor enters the second liquid inlet from the first liquid channel, then enters the second cooling channel from the second groove, and finally goes out from the first liquid outlet.

[0028] According to another specific embodiment of the utility model, the embodiment of the utility model discloses a motor, a plurality of third cooling channels and a plurality of fourth cooling channels are arranged in the stator, the third cooling channel is connected with the first slot and the fourth slot, and the fourth cooling channel is connected with the second slot and the third slot.

[0029] By adopting the technical scheme, the third cooling channel is connected with the first slot and the fourth slot, the first slot is connected with the first liquid inlet channel and the second liquid outlet, in this way, the cooling liquid in the rotor enters the first liquid inlet from the first liquid inlet channel, then enters the third cooling channel from the first slot, then flows into the fourth slot, and finally flows out from the second liquid outlet; the fourth cooling channel is connected with the second slot and the third slot, and the second slot is connected with the first liquid inlet channel and the first liquid outlet, in this way, the cooling liquid in the rotor enters the second liquid inlet from the first liquid inlet channel, then enters the third slot from the fourth cooling channel, and finally flows out from the first liquid outlet. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A perspective view of a rotor cooling structure in some embodiments is shown;

[0031] Figure 1A A structural schematic view of a first end plate in some embodiments is shown;

[0032] Figure 1B A structural schematic view of a second end plate in some embodiments is shown;

[0033] Figure 2 A perspective view of a rotor cooling structure provided by an embodiment of the utility model is shown;

[0034] Figure 2A A structural schematic view of a first end plate provided by an embodiment of the utility model is shown;

[0035] Figure 2B A structural schematic view of a second end plate provided by an embodiment of the utility model is shown;

[0036] Figure 3 A flow direction diagram of the cooling liquid of the rotor cooling structure provided by an embodiment of the utility model is shown;

[0037] Figure 3A A partial flow direction diagram of the cooling liquid of the rotor cooling structure provided by an embodiment of the utility model is shown;

[0038] Figure 3B A complete flow direction diagram of the cooling liquid of the rotor cooling structure provided by an embodiment of the utility model is shown.

[0039] Wherein, the reference numerals: 10, rotor; 11, first channel; 12, second channel; 13, third channel; 14, fourth channel; 15, first liquid inlet channel; 20, first end plate; 21, first Y-shaped groove; 22, first V-shaped groove; 23, first oil inlet; 24, first oil outlet; 25, first outlet; 30, second end plate; 31, second Y-shaped groove; 32, second V-shaped groove; 33, second oil inlet; 34, second oil outlet; 35, second outlet; 100, rotor cooling structure; 101, rotor; 102, first liquid inlet channel; 200, first end plate; 201, first liquid inlet; 202, first liquid outlet; 203, first groove; 204, third groove; 300, second end plate; 301, second liquid inlet; 302, second liquid outlet; 303, second groove; 304, fourth groove; 401, first cooling channel; 402, second cooling channel; 403, third cooling channel; 404, fourth cooling channel. DETAILED DESCRIPTION

[0040] The specific embodiments of the present application will be described below, and other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0041] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0042] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0044] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 embodiment based on the specific circumstances.

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0046] In some implementations, reference Figures 1-1B The rotor 10 includes a first liquid inlet channel 15, which is axially (i.e., Figure 1 Extending in the X direction (as shown), the rotor 10 has a first end plate 20 and a second end plate 30 on its axial sides respectively. The first end plate 20 has four first Y-shaped grooves 21 and four first V-shaped grooves 22, and the second end plate 30 has four second Y-shaped grooves 31 and four second V-shaped grooves 32. One end of each first Y-shaped groove 21 is a first oil inlet 23, and both ends of each first V-shaped groove 22 are first oil outlets 24. One end of each second Y-shaped groove 31 is a second oil inlet 33, and both ends of each second V-shaped groove 32 are second oil outlets 34.

[0047] The first oil inlet 23 is connected to the first liquid inlet channel 15. The other end of the first Y-shaped groove 21 is divided into two first outlets 25. The two first outlets 25 are connected to the two second oil outlets 34 of the second V-shaped groove 32 through the first channel 11 and the second channel 12 on the rotor 10. That is, one first oil inlet 23 on the first end plate 20 corresponds to two second oil outlets 34 on the second end plate 30. In other words, the first end plate 20 is a one-inlet-two-outlet system (i.e., oil enters from the first oil inlet 23 of the first end plate 20 and flows out from the two second oil outlets 34 of the second end plate 30).

[0048] The second oil inlet 33 is communicated with the first liquid inlet channel 15, and the other end of the second Y-shaped groove 31 is divided into two second outlets 35, which are communicated with the two first oil outlets 24 of the first V-shaped groove 22 through the third channel 13 and the fourth channel 14 on the rotor 10. That is, one second oil inlet 33 on the second end plate 30 corresponds to two first oil outlets 24 on the first end plate 20, that is, the second end plate 30 is one inlet and two outlets (that is, from the second oil inlet 33 of the second end plate 30, and flows out from the two first oil outlets 24 of the first end plate 20).

[0049] That is, the cooling liquid (for example, cooling oil) flows from the first liquid inlet channel 15 of the rotor 10 to the first oil inlet 23, and then to the first Y-shaped groove 21, and is divided into two paths at the two ends of the first Y-shaped groove 21 (that is, the two first outlets 25 mentioned above), and then flows out from the second oil outlet 34 at the two ends of the second V-shaped groove 32 of the second end plate 30 through the first channel 11 and the second channel 12, thereby achieving cooling of the rotor 10 between the first end plate 20 and the second end plate 30.

[0050] However, in this process, due to the centrifugal force during rotation of the rotor 10, the cooling liquid can only flow from the first liquid inlet channel 15 to the first oil inlet 23, and when passing through the first Y-shaped groove 21, the cooling liquid will only flow out from one of the first outlets 25 under the action of the centrifugal force, and then flow to one of the second oil outlets 34 of the second end plate 30 through the first channel 11, and there is no cooling liquid in the second channel 12, which results in that the other half of the rotor 10 cannot be cooled and the cooling effect is poor.

[0051] Similarly, the cooling liquid (for example, cooling oil) flows from the first liquid inlet channel 15 of the rotor 10 to the second oil inlet 33, and then to the second Y-shaped groove 31, and is divided into two paths at the two ends of the second Y-shaped groove 31 (that is, the two second outlets 35 mentioned above), and then flows out from the first oil outlet 24 at the two ends of the first V-shaped groove 22 of the first end plate 20 through the third channel 13 and the fourth channel 14, thereby achieving cooling of the rotor 10 between the first end plate 20 and the second end plate 30.

[0052] However, during this process, due to the centrifugal force during rotor rotation, the coolant can only flow from the first inlet channel 15 to the second oil inlet 33. When passing through the second Y-shaped groove 31, the coolant will only flow out from one of the second outlets 35 under the action of centrifugal force, and flow through the third channel 13 to one of the first oil outlets 24 connected to the first end plate 20. There is no coolant in the fourth channel 14, which means that the other half of the rotor 10 cannot be cooled. Although the same part is used for both end plates, the formed circuit will always only have coolant on one side due to the combined effect of centrifugal force and inertia during the forward / reverse rotation of the motor. Only half of the rotor 10 will be cooled, resulting in poor cooling effect.

[0053] Therefore, in order to solve the problem of poor cooling effect mentioned above, this application provides a rotor cooling structure 100. By designing a new end plate oil groove, the above-mentioned one-in-two-out method is changed to one-in-one-out. The original design circuit is split and combined to form eight independent circuits with shorter paths. Combined with eight independent liquid outlets on the shaft, each cooling circuit operates independently regardless of the direction of the motor rotation, ensuring that the entire rotor 101 is cooled.

[0054] For example, refer to Figures 2-2B This application discloses an electric motor, including a stator (not shown) and a rotor cooling structure 100 described later. The stator surrounds the rotor 101, and the stator is provided with eight first cooling channels 401, eight second cooling channels 402, eight third cooling channels 403, and eight fourth cooling channels 404. The first cooling channels 401 are axially (i.e., Figure 2 The second cooling channel 402 extends along the axial direction (i.e., the X direction shown). Figure 2 The third cooling channel 403 extends along the axial direction (i.e., the X direction shown). Figure 2 The fourth cooling channel 404 extends along the axial direction (i.e., the X direction shown). Figure 2 Extending in the X direction (as shown).

[0055] For example, the rotor cooling structure 100 includes: a rotor 101, a first end plate 200, and a second end plate 300. The rotor 101 includes a first liquid inlet channel 102, which is axially (i.e., Figure 2 Extending in the X direction (as shown), the first end plate 200 and the second end plate 300 are respectively disposed on both axial sides of the rotor 101; the side of the first end plate 200 facing the second end plate 300 is provided with eight first liquid inlets 201 and eight first liquid outlets 202, the eight first liquid inlets 201 being circumferentially (i.e., along the X direction). Figure 2A The eight first liquid outlets 202 are spaced apart in the direction A shown, and are arranged circumferentially (i.e., in the direction A). Figure 2A As shown in direction A, the first liquid inlet 201 and the first liquid outlet 202 are not connected to each other.

[0056] The second end plate 300 has eight second liquid inlets 301 and eight second liquid outlets 302 on the side facing the first end plate 200. The eight second liquid inlets 301 are arranged circumferentially (i.e., Figure 2B The eight second liquid outlets 302 are spaced apart in the direction A shown, and are arranged circumferentially (i.e., along the direction A). Figure 2B As shown in direction A, the second inlet 301 and the second outlet 302 are not connected to each other; the number of second outlets 302 is equal to the number of first inlets 201, and the number of first outlets 202 is equal to the number of second inlets 301. The first inlets 201 are connected to the first inlet channel 102 and the second outlet 302 respectively, and the second inlets 301 are connected to the first inlet channel 102 and the first outlet 202 respectively.

[0057] It should be noted that the embodiments of this application do not limit the number of the first liquid inlet 201, the second liquid inlet 301, the first liquid outlet 202, and the second liquid outlet 302, as long as the number of the second liquid outlet 302 is equal to the number of the first liquid inlet 201, and the number of the first liquid outlet 202 is equal to the number of the second liquid inlet 301. That is, the number of the first liquid inlet 201, the second liquid inlet 301, the first liquid outlet 202, and the second liquid outlet 302 can be five, six, ten, etc.

[0058] Similarly, the number of the first cooling channel 401, the second cooling channel 402, the third cooling channel 403, and the fourth cooling channel 404 is not limited in this embodiment. As long as the number of the first cooling channel 401 and the third cooling channel 403 is equal to the number of the first liquid inlet 201, and the number of the second cooling channel 402 and the fourth cooling channel 404 is equal to the number of the second liquid inlet 301, that is, the number of the first cooling channel 401, the second cooling channel 402, the third cooling channel 403, and the fourth cooling channel 404 can be five, six, ten, etc.

[0059] Exemplarily, the first end plate 200 is provided with a plurality of first liquid inlets 201 and a plurality of first liquid outlets 202, the second end plate 300 is provided with a plurality of second liquid inlets 301 and a plurality of second liquid outlets 302, and the number of the first liquid outlets 202 is the same as that of the second liquid inlets 301, and the number of the second liquid outlets 302 is the same as that of the first liquid inlets 201, that is, one first liquid inlet 201 on the first end plate 200 corresponds to one second liquid outlet 302 on the second end plate 300, so as to realize one-in-one-out on the first end plate 200 (i.e. from one first liquid inlet 201 to one second liquid outlet 302) and one-in-one-out on the second end plate 300 (i.e. from one second liquid inlet 301 to one first liquid outlet 202), and the first liquid inlets 201 are respectively connected with the first liquid inlet channels 102 and the second liquid outlets 302 on the rotor 101, and the cooling liquid can flow from the first liquid inlet channels 102 to the first liquid inlets 201 on the first end plate 200, and then flow from the first liquid inlets 201 on the first end plate 200 to the second liquid outlets 302 on the second end plate 300, so as to realize the above-mentioned path, realize the cooling liquid flowing from the first end plate 200 to the second end plate 300, and cool the stator between the first end plate 200 and the second end plate 300.

[0060] Similarly, the second liquid inlets 301 are respectively connected with the first liquid inlet channels 102 and the first liquid outlets 202 on the rotor 101, and the cooling liquid can flow from the first liquid inlet channels 102 to the second liquid inlets 301 on the second end plate 300, and then flow from the second liquid inlets 301 on the second end plate 300 to the first liquid outlets 202 on the first end plate 200, so as to realize the above-mentioned path, realize the cooling liquid flowing from the second end plate 300 to the first end plate 200, and cool the stator between the first end plate 200 and the second end plate 300.

[0061] Exemplarily, the first end plate 200 is provided with eight first grooves 203 on the side facing the second end plate 300, the eight first grooves 203 are arranged at intervals along the circumferential direction (i.e. the A direction shown in the figure), one end of the first groove 203 is the first liquid inlet 201, and the first groove 203 connects the first liquid inlet channel 102 and the second liquid outlet 302. Figure 2A

[0062] ​Exemplarily, one end of the first groove 203 is the first liquid inlet 201. The first liquid inlet 201 is connected to the first liquid inlet channel 102 and the second liquid outlet 302 through the first groove 203, so that the cooling liquid can flow from the first liquid inlet channel 102 of the rotor 101 to the first liquid inlet 201 of the first end plate 200, and then flow out from the second liquid outlet 302 of the second end plate 300, thereby completing the cooling of the stator between the first end plate 200 and the second end plate 300.

[0063] Exemplarily, referring to Figure 2A , the first groove 203 is in an arc shape, specifically a lune shape. In this way, when the rotor 101 rotates, the cooling liquid is subjected to a force deviating from the radial direction under the action of the centrifugal force, that is, the path becomes an arc shape, which matches the shape of the first groove 203. Therefore, the cooling liquid in the first liquid inlet channel 102 of the rotor 101 can better flow to the first groove 203.

[0064] Exemplarily, the second end plate 300 is provided with eight second grooves 303 on the side facing the first end plate 200. The eight second grooves 303 are arranged at intervals along the circumferential direction (i.e., the A direction shown in the figure). One end of the second groove 303 is the second liquid inlet 301. The second groove 303 connects the first liquid inlet channel 102 and the first liquid outlet 202. Figure 2B

[0065] Exemplarily, one end of the second groove 303 is the second liquid inlet 301. The second liquid inlet 301 is connected to the first liquid inlet channel 102 and the first liquid outlet 202 through the second groove 303, so that the cooling liquid can flow from the first liquid inlet channel 102 of the rotor 101 to the second liquid inlet 301 of the second end plate 300, and then flow out from the first liquid outlet 202 of the first end plate 200, thereby completing the cooling of the stator between the second end plate 300 and the first end plate 200.

[0066] Exemplarily, referring to Figure 2B , the second groove 303 is in an arc shape, specifically a lune shape. In this way, when the rotor 101 rotates, the cooling liquid is subjected to a force deviating from the radial direction under the action of the centrifugal force, that is, the path becomes an arc shape, which matches the shape of the second groove 303. Therefore, the cooling liquid in the first liquid inlet channel 102 of the rotor 101 can better flow to the second groove 303.

[0067] Exemplarily, the first end plate 200 is provided with eight third grooves 204 on the side facing the second end plate 300. The eight third grooves 204 are arranged at intervals along the circumferential direction (i.e., the A direction shown in the figure). The third groove 204 is not connected to the first groove 203. One end of the third groove 204 is the first liquid outlet 202. The third groove 204 is connected to the second groove 303. Figure 2A

[0068] ​​Exemplarily, the third groove 204 on the first end plate 200 is not communicated with the first groove 203, one end of the first groove 203 is the first liquid inlet 201, one end of the third groove 204 is the first liquid outlet 202, so that the first liquid inlet 201 and the first liquid outlet 202 are not communicated with each other, the third groove 204 is communicated with the second groove 303, one end of the second groove 303 is the second liquid inlet 301, so that the first liquid outlet 202 of the first end plate 200 is communicated with the second liquid inlet 301 of the second end plate 300, and the number of the second liquid inlet 301 is the same as that of the first liquid outlet 202, realizing one inlet and one outlet of the second end plate 300.

[0069] Exemplarily, one side of the second end plate 300 facing the first end plate 200 is provided with eight fourth grooves 304, the eight fourth grooves 304 are arranged at intervals along the circumferential direction (i.e. the A direction shown in the figure), the fourth groove 304 is not communicated with the second groove 303, one end of the fourth groove 304 is the second liquid outlet 302, and the fourth groove 304 is communicated with the first groove 203. Figure 2B

[0070] Exemplarily, the fourth groove 304 on the second end plate 300 is not communicated with the second groove 303, one end of the second groove 303 is the second liquid inlet 301, one end of the fourth groove 304 is the second liquid outlet 302, so that the second liquid inlet 301 and the second liquid outlet 302 are not communicated with each other, the fourth groove 304 is communicated with the first groove 203, one end of the first groove 203 is the first liquid inlet 201, so that the second liquid outlet 302 of the second end plate 300 is communicated with the first liquid inlet 201 of the first end plate 200, and the number of the first liquid inlet 201 is the same as that of the second liquid outlet 302, realizing one inlet and one outlet of the first end plate 200.

[0071] Exemplarily, referring to Figures 3-3B , the first cooling channel 401 communicates the first liquid inlet 201 and the second liquid outlet 302, the second cooling channel 402 communicates the first liquid outlet 202 and the second liquid inlet 301, the third cooling channel 403 communicates the first groove 203 and the fourth groove 304, and the fourth cooling channel 404 communicates the second groove 303 and the third groove 204.

[0072] Exemplarily, the first cooling channel 401 communicates the first liquid inlet 201 and the second liquid outlet 302, the first groove 203 communicates the first liquid inlet 201 and the second liquid outlet 302, so that the cooling liquid in the rotor 101 enters the first liquid inlet 201 (i.e. point a shown in the figure) from the first liquid inlet 201, then enters the first cooling channel 401 (i.e. ab segment shown by the red line) from the first groove 203 (i.e. ab segment shown by the red line), finally enters the second liquid outlet 302 (i.e. bc segment shown by the red line) from the first cooling channel 401 (i.e. bc segment shown by the red line), and finally enters the second liquid outlet 302 (i.e. point b shown in the figure). Figure 3B Figure 3B Figure 3B Figure 3B ​​​​out (i.e. Figure 3B the path of a→b→c) as shown by the red line. Similarly, the second cooling passage 402 connects the first liquid outlet 202 and the second liquid inlet 301, and the second groove 303 connects the first liquid inlet passage 102 and the first liquid outlet 202, so that the cooling liquid in the rotor 101 enters the second liquid inlet 301 from the first liquid inlet passage 102 (i.e. Figure 3B the point f as shown), and then enters the second cooling passage 402 (i.e. Figure 3B the fg segment as shown by the yellow line), and then enters the second cooling passage 402 (i.e. Figure 3B the gh segment as shown by the yellow line), and finally flows out from the first liquid outlet 202 (i.e. Figure 3B the point h as shown) (i.e. Figure 3B the path of f→g→h) as shown.

[0073] The third cooling passage 403 connects the first groove 203 and the fourth groove 304, and the first groove 203 connects the first liquid inlet passage 102 and the second liquid outlet 302, so that the cooling liquid in the rotor 101 enters the first liquid inlet 201 from the first liquid inlet passage 102 (i.e. Figure 3B the point a as shown), and then enters the first groove 203 (i.e. Figure 3B the ad segment as shown by the red line), and then enters the third cooling passage 403 (i.e. Figure 3B the de segment as shown by the red line), and then flows into the fourth groove 304 (i.e. Figure 3B the ec segment as shown by the red line), and finally flows out from the second liquid outlet 302 (i.e. Figure 3B the point c as shown) (i.e. Figure 3B the path of a→d→e→c) as shown; the fourth cooling passage 404 connects the second groove 303 and the third groove 204, and the second groove 303 connects the first liquid inlet passage 102 and the first liquid outlet 202, so that the cooling liquid in the rotor 101 enters the second liquid inlet 301 from the first liquid inlet passage 102 (i.e. Figure 3B the point f as shown), and then enters the fourth cooling passage 404 (i.e. Figure 3B the fi segment as shown by the yellow line), and then enters the third groove 204 (i.e. Figure 3B the ih segment as shown by the yellow line), and finally flows out from the first liquid outlet 202 (i.e. Figure 3B the point h as shown) (i.e. Figure 3B the path of f→i→h) as shown.

[0074] In summary, the cooling liquid enters the eight first liquid inlets 201 of the first end plate 200 from the first liquid inlet passage 102 of the rotor 101, and then enters the first cooling passage 401 of the rotor 101 through the first groove 203 under the action of centrifugal force, and finally flows out from the second liquid outlet 302 of the second end plate 300 (i.e. Figure 3BThe path shown is from a→b→c; part of the coolant enters the third cooling channel 403 of the rotor 101 from the first tank 203, then enters the fourth tank 304 of the second end plate 300, and finally flows out from the second outlet 302 of the second end plate 300 (i.e., Figure 3B The path shown is from a→d→e→c.

[0075] Similarly, the coolant enters the eight second inlets 301 of the second end plate 300 through the first inlet channel 102 of the rotor 101, and under the action of centrifugal force, it enters the second cooling channel 402 of the rotor 101 through the second groove 303, and finally flows out from the first outlet 202 of the first end plate 200 (i.e., Figure 3B The path shown is from f→g→h; part of the coolant enters the fourth cooling channel 404 of the rotor 101 from the second tank 303, then enters the third tank 204 of the first end plate 200, and finally flows out from the first outlet 202 of the first end plate 200, thus completing the cooling of the rotor 101 (i.e., ​ The path shown is from f→i→h.

[0076] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A rotor cooling structure characterized by, The rotor comprises a first liquid inlet channel extending in the axial direction, and the axial two sides of the rotor are respectively provided with a first end plate and a second end plate. A side of the first end plate facing the second end plate is provided with a plurality of first liquid inlets and a plurality of first liquid outlets, the plurality of first liquid inlets are arranged at intervals along the circumferential direction, the plurality of first liquid outlets are arranged at intervals along the circumferential direction, and the first liquid inlets and the first liquid outlets are not communicated with each other. A side of the second end plate facing the first end plate is provided with a plurality of second liquid inlets and a plurality of second liquid outlets, the number of the first liquid outlets is the same as that of the second liquid inlets, the number of the second liquid outlets is the same as that of the first liquid inlets, the plurality of second liquid inlets are arranged at intervals along the circumferential direction, the plurality of second liquid outlets are arranged at intervals along the circumferential direction, and the second liquid inlets and the second liquid outlets are not communicated with each other. The first liquid inlets are respectively communicated with the first liquid inlet channel and the second liquid outlet, and the second liquid inlets are respectively communicated with the first liquid inlet channel and the first liquid outlet. A side of the first end plate facing the second end plate is provided with a plurality of first grooves, the plurality of first grooves are arranged at intervals along the circumferential direction, one end of the first groove is the first liquid inlet, and the first groove communicates the first liquid inlet channel and the second liquid outlet.

2. The rotor cooling structure of claim 1, wherein The first groove is in an arc shape.

3. The rotor cooling structure of claim 2, wherein A side of the second end plate facing the first end plate is provided with a plurality of second grooves, the plurality of second grooves are arranged at intervals along the circumferential direction, one end of the second groove is the second liquid inlet, and the second groove communicates the first liquid inlet channel and the first liquid outlet.

4. The rotor cooling structure of claim 2, wherein The second groove is in an arc shape.

5. The rotor cooling structure of claim 4, wherein A side of the first end plate facing the second end plate is provided with a plurality of third grooves, the plurality of third grooves are arranged at intervals along the circumferential direction, the third grooves are not communicated with the first grooves, one end of the third groove is the first liquid outlet, and the third groove is communicated with the second groove.

6. The rotor cooling structure of claim 4, wherein A side of the second end plate facing the first end plate is provided with a plurality of fourth grooves, the plurality of fourth grooves are arranged at intervals along the circumferential direction, the fourth grooves are not communicated with the second grooves, one end of the fourth groove is the second liquid outlet, and the fourth groove is communicated with the first groove.

7. The rotor cooling structure of claim 6, wherein The rotor cooling structure comprises a stator and a rotor as claimed in any one of claims 1 to 7, the stator surrounds the rotor, the stator is provided with a plurality of first cooling channels and a plurality of second cooling channels inside, the first cooling channels communicate the first liquid inlets and the second liquid outlets, and the second cooling channels communicate the first liquid outlets and the second liquid inlets.

8. An electric machine characterized by The stator is provided with a plurality of third cooling channels and a plurality of fourth cooling channels inside, the third cooling channels communicate the first grooves and the fourth grooves, and the fourth cooling channels communicate the second grooves and the third grooves.

9. The electric machine of claim 8, wherein, ​

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