Composite waterway structure and motor

Abstract

The application provides a composite water channel structure and a motor, and relates to the technical field of motor equipment. The composite water channel structure comprises a casing water channel, a first end cover water channel, a second end cover water channel, a first flange water channel and a second flange water channel. The casing water channel is distributed on the outer periphery of a motor stator; the first end cover water channel is at least partially arranged in the mounting area of a first bearing of the motor; the second end cover water channel is at least partially arranged in the mounting area of a second bearing of the motor; and the motor comprises the above composite water channel structure. The first flange water channel connects the casing water channel and the first end cover water channel to realize the communication of the two; and the second flange water channel connects the casing water channel and the second end cover water channel to realize the communication of the two, so that the cooling liquid can flow between the casing water channel, the first flange water channel, the first end cover water channel, the second flange water channel and the second end cover water channel, and a whole water channel structure is formed. The structure is simple and has high reliability, can effectively cool the motor stator and the bearings at the same time, and is suitable for large-scale production and application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor equipment, in particular to a composite water channel structure and motor. BACKGROUND

[0002] As the core power component of freight electric locomotive, the traction motor adopts the driving structure of high-torque permanent magnet direct drive traction motor, which can eliminate the loss of gear transmission efficiency, thereby improving the overall efficiency of the freight electric locomotive.

[0003] In the freight electric locomotive, the direct drive transmission replaces the gear transmission, which can increase the traction motor torque by the multiple of the transmission ratio while reducing its speed by the multiple of the transmission ratio, while keeping the traction performance consistent. However, this operating characteristic of high torque and low speed brings a serious heat dissipation challenge, mainly in two aspects:

[0004] 1) Stator high heat load problem: Since the high-torque permanent magnet direct drive traction motor works in a low-speed and high-torque state, the stator copper loss ratio is much higher than that of the gear transmission traction motor, so the heat generated in the stator area increases, and therefore the heat dissipation capacity of the stator is required to be higher.

[0005] 2) Bearing heat dissipation difficulty problem: In order to transmit large torque, high-torque permanent magnet direct drive traction motors generally adopt a hollow shaft transmission structure, which requires the bearing to have a large carrying capacity. However, such bearings are operated in a low-speed and fully enclosed working condition for a long time, and the cooling effect of the fan attached to the bearing is extremely weak or even ineffective due to the low speed, and the enclosed environment hinders the effective flow of internal air, so the heat generated by the bearing is difficult to exchange effectively with the high-temperature stator or the machine shell through the internal air, resulting in extremely difficult heat dissipation in the bearing area, affecting the reliability and safety of the motor operation.

[0006] For the heat dissipation problem of high-torque permanent magnet direct drive traction motor, the existing technology proposes a water channel cooling structure. However, such water channel cooling structure mainly focuses on improving the heat dissipation capacity of the motor stator area and increasing the flexibility of the inlet and outlet port arrangement. Although various structural forms and cooling liquid circulation modes have been developed, these schemes have not fully considered or effectively solved the heat dissipation problem of the bearing area. In addition, in order to pursue the cooling effect of the stator, some existing water channel structures are designed to be too complex, increasing the processing difficulty and manufacturing cost of the motor, which is not conducive to large-scale production and application. SUMMARY

[0007] In view of the technical problems in the prior art, the present application provides a composite water channel structure and motor, which aims to solve the heat dissipation problem of high-torque permanent magnet direct drive traction motor under low-speed and high-torque working conditions.

[0008] A composite water channel structure for forming a cooling circuit for cooling a motor stator and bearings, the composite water channel structure comprising:

[0009] A casing water channel distributed around an outer periphery of the motor stator;

[0010] A first end cover water channel at least partially disposed in a mounting region of a first bearing of the motor;

[0011] A second end cover water channel at least partially disposed in a mounting region of a second bearing of the motor;

[0012] A first flange water channel connecting the casing water channel and the first end cover water channel;

[0013] A second flange water channel connecting the casing water channel and the second end cover water channel.

[0014] Further, the first end cover water channel comprises:

[0015] A first end cover annular water channel disposed in the mounting region of the first bearing of the motor;

[0016] A first end cover inlet water channel connected to an inlet end of the first end cover annular water channel;

[0017] A first end cover outlet water channel connected to an outlet end of the first end cover annular water channel;

[0018] And / or, the second end cover water channel comprises:

[0019] A second end cover annular water channel disposed in the mounting region of the second bearing of the motor;

[0020] A second end cover inlet water channel connected to an inlet end of the second end cover annular water channel;

[0021] A second end cover outlet water channel connected to an outlet end of the second end cover annular water channel.

[0022] Further, the casing water channel comprises a plurality of water channels that collectively form a main cooling circuit for cooling the motor stator.

[0023] Further, the first flange water channel comprises:

[0024] A first flange inlet water channel connected to an inlet end of the casing water channel and the first end cover water channel;

[0025] A first flange outlet water channel connected to an outlet end of the casing water channel and the first end cover water channel;

[0026] The first flange inlet water channel, the first end cover water channel, and the first flange outlet water channel collectively form a first branch cooling circuit for cooling the first bearing of the motor, the first branch cooling circuit being in parallel with the main cooling circuit.

[0027] And / or, the second flange water channel comprises:

[0028] A second flange water inlet channel connecting the water inlet end of the casing water channel and the second end cover water channel;

[0029] A second flange water outlet channel connecting the water outlet end of the casing water channel and the second end cover water channel;

[0030] The second flange water inlet channel, the second end cover water channel and the second flange water outlet channel together form a second branch cooling circuit for cooling the second bearing of the motor, which is connected in parallel to the main cooling circuit.

[0031] Further, the multi-channel water channel comprises:

[0032] A first water channel surrounding the circumference of the motor stator and located at one end of the motor stator axially close to the first end cover water channel;

[0033] A second water channel surrounding the circumference of the motor stator and located at one end of the motor stator axially close to the second end cover water channel;

[0034] An axial water channel arranged along the axial direction of the motor stator and connecting the first water channel and the second water channel;

[0035] A plurality of turn-back water channels located between the first water channel and the second water channel, and adjacent two of the turn-back water channels are connected in sequence.

[0036] Further, the plurality of turn-back water channels comprises:

[0037] A terminal turn-back water channel surrounding the circumference of the motor stator and located close to the first water channel;

[0038] A head turn-back water channel surrounding the circumference of the motor stator and located close to the second water channel and connected to the water outlet end of the second water channel;

[0039] A middle turn-back water channel located between the head turn-back water channel and the terminal turn-back water channel, the water inlet end of which is connected to the water outlet end of the head turn-back water channel, and the water outlet end of which is connected to the water inlet end of the terminal turn-back water channel.

[0040] Further, the composite water channel structure further comprises:

[0041] A water inlet arranged at the water inlet end of the first water channel;

[0042] A water outlet arranged at the water outlet end of the terminal turn-back water channel;

[0043] The water inlet and the water outlet are arranged on the same side.

[0044] In another aspect, the present application also provides an electric machine comprising:

[0045] The composite water channel structure according to any one of the above embodiments;

[0046] A casing, wherein the casing water channel is arranged inside the casing;

[0047] A first end cover arranged at one end of the casing, wherein the first end cover water channel is arranged inside the first end cover;

[0048] A first flange connecting the casing and the first end cover, wherein the first flange water channel is arranged inside the first flange;

[0049] A second end cover arranged at the other end of the casing, wherein the second end cover water channel is arranged inside the second end cover;

[0050] A second flange connecting the casing and the second end cover, wherein the second flange water channel is arranged inside the second flange.

[0051] Further, the electric machine further comprises a stator sleeved inside the casing, wherein the casing comprises:

[0052] An inner casing arranged around the outer periphery of the stator;

[0053] An outer casing coaxially and spacedly arranged with the inner casing;

[0054] A plurality of water channel ribs welded between the outer casing and the inner casing, wherein the inner space of the casing is divided into a plurality of water channels by the plurality of water channel ribs.

[0055] Further, the electric machine further comprises:

[0056] A rotor inserted into the inside of the stator;

[0057] A first bearing mounted between the first end cover and the rotor;

[0058] A second bearing mounted between the second end cover and the rotor.

[0059] Compared with the prior art, the composite water channel structure and the electric machine provided by the embodiments of the present application at least have the following technical effects:

[0060] The composite water channel structure comprises a casing water channel, a first end cover water channel, a second end cover water channel, a first flange water channel and a second flange water channel. The casing water channel is distributed around the outer periphery of the motor stator and is used for heat dissipation of the motor stator; the first end cover water channel is at least partially arranged in the mounting area of the first bearing of the motor and is used for heat dissipation of the first bearing; and the second end cover water channel is at least partially arranged in the mounting area of the second bearing of the motor and is used for heat dissipation of the second bearing. The first flange water channel connects the casing water channel and the first end cover water channel to realize the communication therebetween; and the second flange water channel connects the casing water channel and the second end cover water channel to realize the communication therebetween. Through the connection, the cooling liquid can flow between the casing water channel, the first flange water channel, the first end cover water channel, the second flange water channel and the second end cover water channel to form an integral water channel structure. The structure is simple and has high reliability, can effectively dissipate heat of the motor stator and the bearings at the same time, solves the heat dissipation problem of the high-torque permanent magnet direct-drive traction motor under the low-speed high-torque working condition, and is suitable for large-scale production and application. BRIEF DESCRIPTION OF DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0062] Figure 1 A cross-sectional structure schematic diagram of the motor in an embodiment of the present application;

[0063] Figure 2 A water channel schematic diagram of the composite water channel structure in an embodiment of the present application hidden behind the casing structure;

[0064] Figure 3 A structure schematic diagram of the casing water channel hidden behind the casing in an embodiment of the present application.

[0065] Label: 1, composite waterway structure; 10, casing waterway; 11, first waterway; 12, second waterway; 13, axial waterway; 141, third waterway; 142, fourth waterway; 143, fifth waterway; 144, sixth waterway; 145, seventh waterway; 146, eighth waterway; 20, first end cover waterway; 201, first end cover annular waterway; 202, first end cover water inlet; 203, first end cover water outlet; 30, second end cover waterway; 40, first flange waterway; 41, first flange water inlet; 42, first flange water outlet; 50, second flange waterway; 60, water inlet; 70, water outlet; 2, casing; 21, inner casing; 22, outer casing; 23, waterway rib; 3, first end cover; 4, first flange; 5, second end cover; 6, second flange; 7, stator; 71, stator core; 72, stator winding; 73, first stator pressing ring; 74, second stator pressing ring; 8, rotor; 81, rotor shaft; 82, rotor core; 83, magnetic steel; 84, rotor pressing ring; 91, first bearing; 92, second bearing. DETAILED DESCRIPTION

[0066] In order to make the technical personnel in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the ordinary skilled in the art without creative labor are within the scope of protection of the present application.

[0067] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0068] It should be understood that the structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the present specification, to enable those skilled in the art to understand and read, and are not used to limit the conditions that can be implemented by the present application, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0069] As the core power component of a freight electric locomotive, the traction motor adopts a driving structure of a high-torque permanent magnet direct-drive traction motor, which can eliminate the loss of gear transmission efficiency, thereby improving the overall efficiency of the freight electric locomotive.

[0070] In freight electric locomotives, direct drive transmission replaces gear transmission to achieve the increase of traction motor torque by the multiple of transmission ratio and the decrease of its rotation speed by the multiple of transmission ratio while keeping the consistency of traction performance. However, such operating characteristics of high torque and low rotation speed bring about severe heat dissipation challenges, mainly in two aspects:

[0071] 1) High thermal load problem of stator: the copper loss ratio of the stator of high torque permanent magnet direct drive traction motor is much higher than that of gear transmission traction motor due to its operation in the state of low speed and high torque, which increases the heat generated in the stator area, thus putting forward higher requirements for the heat dissipation capacity of the stator.

[0072] 2) Difficult heat dissipation problem of bearing: in order to transmit large torque, high torque permanent magnet direct drive traction motor generally adopts hollow shaft transmission structure, which requires the bearing to have larger carrying capacity. However, such bearing operates in the working condition of low rotation speed and full sealing for a long time, and the cooling effect of its self-fan is extremely weak or even ineffective due to low rotation speed, and the closed environment hinders the effective flow of internal air, thus the heat generated by the bearing is difficult to be effectively exchanged with the high temperature stator or the machine shell through internal air, resulting in extremely difficult heat dissipation in the bearing area, which affects the reliability and safety of motor operation.

[0073] For the heat dissipation problem of high torque permanent magnet direct drive traction motor, the existing technology proposes a water channel cooling structure. However, such water channel cooling structure mainly focuses on improving the heat dissipation capacity of the stator area of the motor and increasing the flexibility of the arrangement of water inlet and outlet. The following examples are given respectively:

[0074] Patent CN113497513B discloses a cooling water channel structure of motor and a machine shell. Specifically, by adjusting the series-parallel mode of different water channels, the specified water inlet and outlet positions and the rotary structure at the communication place are realized, so that the installation positions of the water inlet and outlet nozzles are more flexible, and the water flow direction is more flexible. At the same time, by bending the communication place of the connected circumferential water channels into a C-shaped rotary structure, the water flow can cross multiple layers of water channels to reach any layer of water channel, and the crossed water channel can be arranged at the middle gap of the C-shaped corner. In addition, the water channel design adopts the combination of circumferential type and spiral shape, which fully utilizes the contact area of the water channel and the shell, realizes the maximization of the water channel area, reduces the amount of shell, and also has the characteristics of low flow resistance of spiral water channel. This scheme solves the problems of unreasonable water channel structure, large pressure loss, etc. in the liquid cooling technology of the machine shell in the existing electric vehicle three-in-one electric drive system, and the water inlet nozzle and the water outlet nozzle occupy a large space, which is not convenient for installation and adjustment.

[0075] Patent CN115441638A discloses a variable-width and variable-quantity motor water channel structure and motor. Specifically, by arranging the water inlet near the side of the motor winding welding end, the outgoing end is preferentially cooled, effectively reducing the end temperature rise. At the same time, the motor cooling water channel adopts a circumferentially arranged return bend water channel, a spiral connecting water channel and an axially arranged water outlet, which maximizes the water channel contact area while reducing the water channel flow resistance, and uniformly and evenly without dead water area, and increases the turbulent flow in the rotation area to strengthen heat dissipation. In addition, the water inlet and outlet are arranged on different sides, which is suitable for the case where the inlet and outlet positions have an angle difference, and has stronger flexibility and applicability. This scheme solves the problems of not being suitable for the case where the inlet and outlet positions have an angle difference, the low overall flow rate of the water channel with a large width, and the small water channel covering area of the outer rotor motor water channel structure, and the poor heat dissipation capacity.

[0076] Patent CN110299789B discloses a motor cooling water channel structure with external water connection. Specifically, the cooling water channel structure includes a section of connected high-pressure water pipe, and after the high-pressure water pipe is removed, the water inlets at both ends thereof can be connected with external water channels, thereby cooling the motor and other external devices at the same time, simplifying the entire mechanical structure, and facilitating transportation, installation and actual use; the cooling water channel structure is provided with two water inlets and two water outlets, so that when one of the water inlets or water outlets is damaged, the other one can be used, and when the motor is used in a mine, it is convenient to select the water inlet and water outlet at which position to use according to the actual situation. This scheme solves the problems of the complexity of the entire mechanical structure caused by the need for other devices to be cooled by connecting water when the existing motor is used with other devices, and the inconvenience of water connection of the water inlet of the existing motor cooling water channel.

[0077] In summary, the high-torque permanent magnet direct-drive traction motor for freight electric locomotives has very high requirements for the cooling and heat dissipation of the motor stator and bearings to ensure the reliability of the operation of the freight electric locomotive. For the heat dissipation problem of the high-torque permanent magnet direct-drive traction motor, although the water channel cooling structure is proposed in the prior art, and various structural forms and cooling liquid circulation modes have been developed, these schemes do not fully consider or effectively solve the heat dissipation problem of the bearing area. In addition, in order to pursue the cooling effect of the stator, the existing water channel structure is designed to be too complex, which increases the processing difficulty and manufacturing cost of the motor, and is not conducive to large-scale production and application.

[0078] In view of the above problems, please refer to the accompanying Figure 1 to the accompanying Figure 3As shown, an embodiment of the present application provides a motor, which comprises a composite water channel structure 1, a casing 2, a first end cover 3, a first flange 4, a second end cover 5 and a second flange 6. The composite water channel structure 1 is used to form a cooling circuit for cooling the motor stator and bearings, and comprises a casing water channel 10, a first end cover water channel 20, a second end cover water channel 30, a first flange water channel 40 and a second flange water channel 50. The casing water channel 10 is distributed around the outer periphery of the motor stator 7 and used to dissipate heat from the motor stator 7. At least part of the first end cover water channel 20 is arranged in the mounting area of the first bearing 91 of the motor and used to dissipate heat from the first bearing 91. At least part of the second end cover water channel 30 is arranged in the mounting area of the second bearing 92 of the motor and used to dissipate heat from the second bearing 92. The first flange water channel 40 connects the casing water channel 10 and the first end cover water channel 20. The second flange water channel 50 connects the casing water channel 10 and the second end cover water channel 30.

[0079] In this embodiment, the composite water channel structure 1 comprises the casing water channel 10, the first end cover water channel 20, the second end cover water channel 30, the first flange water channel 40 and the second flange water channel 50. The casing water channel 10 is distributed around the outer periphery of the motor stator 7 and used to dissipate heat from the motor stator 7. At least part of the first end cover water channel 20 is arranged in the mounting area of the first bearing 91 of the motor and used to dissipate heat from the first bearing 91. At least part of the second end cover water channel 30 is arranged in the mounting area of the second bearing 92 of the motor and used to dissipate heat from the second bearing 92. The first flange water channel 40 connects the casing water channel 10 and the first end cover water channel 20, realizing their communication. The second flange water channel 50 connects the casing water channel 10 and the second end cover water channel 30, realizing their communication. Through this connection, the cooling liquid can flow between the casing water channel 10, the first flange water channel 40, the first end cover water channel 20, the second flange water channel 50 and the second end cover water channel 30, forming an overall water channel structure. This structure is simple and has high reliability, and can effectively dissipate heat from the motor stator 7 and bearings at the same time, solving the heat dissipation problem of high-torque permanent magnet direct-drive traction motors under low-speed high-torque working conditions, and being suitable for large-scale production and application.

[0080] In some optional embodiments, the first end cover water channel 20 comprises a first end cover annular water channel 201, a first end cover water inlet channel 202, and a first end cover water outlet channel 203. The first end cover annular water channel 201 is arranged at the installation area of the motor first bearing 91, so that the cooling liquid can more comprehensively cover the area of the motor first bearing 91, thereby improving the cooling effect. The first end cover water inlet channel 202 is connected with the water inlet end of the first end cover annular water channel 201. The first end cover water outlet channel 203 is connected with the water outlet end of the first end cover annular water channel 201. Specifically, the first end cover water inlet channel 202 and the first end cover water outlet channel 203 are respectively arranged at different positions in the circumferential direction of the first end cover 3 and are close to the first end cover annular water channel 201 in the radial direction of the first end cover 3. The two ends of the first end cover annular water channel 201 are sealed by a metal steel plate to ensure the airtightness of the water channel and effectively prevent the cooling liquid from leaking. Optionally, a water baffle is arranged in the first end cover annular water channel 201 at a position close to the first end cover water inlet channel 202 and the first end cover water outlet channel 203, respectively, for guiding the directional flow of the cooling liquid along the water inlet direction.

[0081] In some optional embodiments, the second end cover water channel 30 comprises a second end cover annular water channel, a second end cover water inlet channel, and a second end cover water outlet channel. The second end cover annular water channel is arranged at the installation area of the motor second bearing 92, so that the cooling liquid can more comprehensively cover the area of the motor second bearing 92. The second end cover water inlet channel is connected with the water inlet end of the second end cover annular water channel. The second end cover water outlet channel is connected with the water outlet end of the second end cover annular water channel. Specifically, the second end cover water inlet channel and the second end cover water outlet channel are respectively arranged at different positions in the circumferential direction of the second end cover 5 and are close to the second end cover annular water channel in the radial direction of the second end cover 5. The two ends of the second end cover annular water channel are sealed by a metal steel plate. Optionally, a water baffle is arranged in the second end cover annular water channel at a position close to the second end cover water inlet channel and the second end cover water outlet channel, respectively, for guiding the directional flow of the cooling liquid along the water inlet direction.

[0082] In some optional embodiments, the shell water channel 10 comprises a plurality of water channels that collectively form a main cooling loop for cooling the motor stator 7. Specifically, the plurality of water channels are arranged in the axial direction of the motor stator 7, and each water channel surrounds the circumferential direction of the motor stator 7. It is worth noting that the size and position of the water channel can be set according to actual needs.

[0083] In some alternative embodiments, the first flange water channel 40 comprises a first flange water inlet channel 41 and a first flange water outlet channel 42; the first flange water inlet channel 41 connects the water inlet end of the casing water channel 10 and the first end cover water channel 20; the first flange water outlet channel 42 connects the water outlet end of the casing water channel 10 and the first end cover water channel 20; the first flange water inlet channel 41, the first end cover water channel 20 and the first flange water outlet channel 42 jointly form a first branch cooling circuit for cooling the first bearing 91 of the motor, which is in parallel with the main cooling circuit.

[0084] In some alternative embodiments, the second flange water channel 50 comprises a second flange water inlet channel and a second flange water outlet channel; the second flange water inlet channel connects the water inlet end of the casing water channel 10 and the second end cover water channel 30; the second flange water outlet channel connects the water outlet end of the casing water channel 10 and the second end cover water channel 30; the second flange water inlet channel, the second end cover water channel 30 and the second flange water outlet channel jointly form a second branch cooling circuit for cooling the second bearing 92 of the motor, which is in parallel with the main cooling circuit.

[0085] In some alternative embodiments, the multi-channel water channel is mainly composed of circumferential turns, and the number of turns is n, usually n≥4. Specifically, the multi-channel water channel comprises a first water channel 11, a second water channel 12, an axial water channel 13 and a plurality of turn water channels; the first water channel 11 surrounds the circumference of the motor stator 7 and is located at one end of the motor stator 7 axially close to the first end cover water channel 20; the second water channel 12 surrounds the circumference of the motor stator 7 and is located at one end of the motor stator 7 axially close to the second end cover water channel 30; the axial water channel 13 is arranged along the axial direction of the motor stator 7 and connects the first water channel 11 and the second water channel 12; the plurality of turn water channels are located between the first water channel 11 and the second water channel 12, and adjacent two turn water channels are sequentially connected. The plurality of turn water channels are arranged along the axial direction of the motor stator 7 between the first water channel 11 and the second water channel 12, and each turn water channel surrounds the circumference of the motor stator 7.

[0086] In some alternative embodiments, the plurality of turn water channels comprise a terminal turn water channel, a head turn water channel and a middle turn water channel; the terminal turn water channel surrounds the circumference of the motor stator 7 and is located close to the first water channel 11; the head turn water channel surrounds the circumference of the motor stator 7 and is located close to the second water channel 12 and is connected with the water outlet end of the second water channel 12; the middle turn water channel is located between the head turn water channel and the terminal turn water channel, the water inlet end of which is connected with the water outlet end of the head turn water channel, and the water outlet end of which is connected with the water inlet end of the terminal turn water channel.

[0087] In some optional embodiments, the composite water channel structure 1 further comprises a water inlet 60 and a water outlet 70; the water inlet 60 is arranged at the water inlet end of the first water channel 11; the water outlet 70 is arranged at the water outlet end of the terminal turn-back water channel; further, the water inlet 60 and the water outlet 70 are arranged on the same side and can be arranged at the lower position of the casing 2.

[0088] In a specific embodiment, the multiple-turn-back water channel comprises a terminal turn-back water channel, a head-turn-back water channel and a middle-turn-back water channel. The head-turn-back water channel is the third water channel 141, the middle-turn-back water channel comprises the fourth water channel 142, the fifth water channel 143, the sixth water channel 144 and the seventh water channel 145, and the terminal turn-back water channel is the eighth water channel 146. The first water channel 11 is communicated with the first flange water inlet 41 and the first flange water outlet 42 through two U-shaped grooves, and the first flange water inlet 41 and the first flange water outlet 42 are adjustable along the circumferential position of the first water channel 11. The second water channel 12 is communicated with the second flange water inlet and the second flange water outlet through two U-shaped grooves, and the second flange water inlet and the second flange water outlet are adjustable along the circumferential position of the second water channel 12. In addition, the first flange water inlet 41 and the second flange water inlet can be symmetrically arranged at the two ends of the casing water channel 10 or asymmetrically arranged at the two ends of the casing water channel 10, which is not specifically limited herein. Similarly, the first flange water outlet 42 and the second flange water outlet can be symmetrically arranged at the two ends of the casing water channel 10 or asymmetrically arranged at the two ends of the casing water channel 10, which is also not specifically limited herein.

[0089] In some optional embodiments, the casing water channel 10 is arranged in the casing 2; the first end cover 3 is arranged at one end of the casing 2, the first end cover water channel 20 is arranged in the first end cover 3; the first flange 4 connects the casing 2 and the first end cover 3, and the first flange water channel 40 is arranged in the first flange 4; the second end cover 5 is arranged at the other end of the casing 2, and the second end cover water channel 30 is arranged in the second end cover 5; the second flange 6 connects the casing 2 and the second end cover 5, and the second flange water channel 50 is arranged in the second flange 6. The first end cover 3 and the first flange 4 are circumferentially sealed along the axial direction of the motor, effectively preventing the cooling liquid from leaking. Similarly, the second end cover 5 and the second flange 6 are also circumferentially sealed along the axial direction of the motor.

[0090] In some optional embodiments, the motor further comprises a stator 7 sleeved on the inner side of the casing 2; specifically, the stator 7 comprises a stator core 71, a stator winding 72, a first stator pressing ring 73 and a second stator pressing ring 74, the stator winding 72 is wound on the stator core 71, the first stator pressing ring 73 is arranged at one end of the stator core 71, and the second stator pressing ring 74 is arranged at the other end of the stator core 71. Through the arrangement of the first stator pressing ring 73 and the second stator pressing ring 74, the stator winding 72 is effectively fixed and wound on the stator core 71.

[0091] In some optional embodiments, the casing 2 comprises an inner shell 21, an outer shell 22 and a plurality of water channel ribs 23; the inner shell 21 is arranged around the outer periphery of the stator 7; the outer shell 22 is coaxial with the inner shell 21 and is arranged in a spaced manner; the plurality of water channel ribs 23 are welded between the outer shell 22 and the inner shell 21, and the interior space of the casing 2 is divided into a plurality of water channels by the plurality of water channel ribs 23. The casing 2 can be cylindrical, and its two ends are connected with the first flange 4 and the second flange 6 respectively. Specifically, the inner shell 21 entirely wraps the stator core 71 in the circumferential direction.

[0092] In some optional embodiments, the motor further comprises a rotor 8, a first bearing 91 and a second bearing 92, and the first end cover 3 and the second end cover 5 support the rotor 8 through the first bearing 91 and the second bearing 92 respectively. The rotor 8 is inserted into the inner side of the stator 7 and comprises a rotor shaft 81, a rotor core 82 and a plurality of magnetic steels 83. The plurality of magnetic steels 83 are embedded in different positions of the rotor core 82 and extend in the axial direction. In order to stably fix the rotor core 82 and the plurality of magnetic steels 83 on the rotor shaft 81, two rotor pressing rings 84 are arranged at the two ends of the rotor core 82 respectively.

[0093] The above only describes the embodiments of the present application, and it should be pointed out that, for those skilled in the art, improvements can be made without departing from the inventive concept, and these improvements are within the protection scope of the present application.

Claims

1. A composite waterway structure, characterized by, The composite water channel structure comprises: A casing water channel distributed around the outer periphery of the motor stator, the casing water channel comprising a plurality of water channels which together form a main cooling circuit for cooling the motor stator; A first end cover water channel arranged at least partially in the mounting area of the first bearing of the motor; A second end cover water channel arranged at least partially in the mounting area of the second bearing of the motor; A first flange water channel connecting the casing water channel and the first end cover water channel; A second flange water channel connecting the casing water channel and the second end cover water channel; The first flange water channel and the first end cover water channel together form a first branch cooling circuit for cooling the first bearing of the motor, the first branch cooling circuit being connected in parallel to the main cooling circuit; the second flange water channel and the second end cover water channel together form a second branch cooling circuit for cooling the second bearing of the motor, the second branch cooling circuit being connected in parallel to the main cooling circuit; The plurality of water channels comprises: A first water channel surrounding the periphery of the motor stator and located at one end of the motor stator axially close to the first end cover water channel, the first water channel being in communication with the first flange water channel, and a water inlet being arranged at the water inlet end of the first water channel; A second water channel surrounding the periphery of the motor stator and located at one end of the motor stator axially close to the second end cover water channel, the second water channel being in communication with the second flange water channel; An axial water channel arranged along the axial direction of the motor stator and connecting the first water channel and the second water channel; A plurality of return water channels arranged between the first water channel and the second water channel, adjacent two return water channels being in communication in sequence, and a water outlet being arranged at the water outlet end of the plurality of return water channels.

2. The composite waterway structure of claim 1, wherein The first end cover water channel comprises: A first end cover annular water channel arranged in the mounting area of the first bearing of the motor; A first end cover water inlet channel connected to the water inlet end of the first end cover annular water channel; A first end cover water outlet channel connected to the water outlet end of the first end cover annular water channel; And / or, the second end cover water channel comprises: A second end cover annular water channel arranged in the mounting area of the second bearing of the motor; A second end cover water inlet channel connected to the water inlet end of the second end cover annular water channel; A second end cover water outlet channel connected to the water outlet end of the second end cover annular water channel.

3. The composite waterway structure of claim 2, wherein The first flange water channel comprises: A first flange water inlet channel connected to the water inlet end of the casing water channel and the first end cover water channel; A first flange water outlet channel connected to the water outlet end of the casing water channel and the first end cover water channel; The first flange water inlet channel, the first end cover water channel and the first flange water outlet channel together form the first branch cooling circuit; the first water channel is in communication with the first flange water inlet channel and the first flange water outlet channel through two U-shaped grooves, respectively, and the positions of the first flange water inlet channel and the first flange water outlet channel along the periphery of the first water channel are adjustable; And / or, the second flange water channel comprises: A second flange water inlet channel connected to the water inlet end of the casing water channel and the second end cover water channel; A second flange water outlet channel connected to the water outlet end of the casing water channel and the second end cover water channel; The second flange water inlet channel, the second end cover water channel and the second flange water outlet channel jointly form the second branch cooling circuit; the second water channel is in communication with the second flange water inlet channel and the second flange water outlet channel through two U-shaped grooves respectively, and the second flange water inlet channel and the second flange water outlet channel are adjustable in the circumferential position of the second water channel.

4. The composite waterway structure of claim 1, wherein The multiple-turn return water channel comprises: a terminal return water channel surrounding the circumference of the motor stator and arranged close to the first water channel; a head return water channel surrounding the circumference of the motor stator and arranged close to the second water channel and in communication with the water outlet end of the second water channel; a middle return water channel between the head return water channel and the terminal return water channel, with the water inlet end in communication with the water outlet end of the head return water channel and the water outlet end in communication with the water inlet end of the terminal return water channel.

5. The composite waterway structure of claim 4, wherein The water outlet is arranged at the water outlet end of the terminal return water channel; the water inlet and the water outlet are arranged on the same side.

6. An electric machine characterized by The composite water channel structure comprises: the composite water channel structure according to any one of claims 1 to 5; a casing, wherein the casing water channel is arranged in the casing; a first end cover arranged at one end of the casing, wherein the first end cover water channel is arranged in the first end cover; a first flange connecting the casing and the first end cover, wherein the first flange water channel is arranged in the first flange; a second end cover arranged at the other end of the casing, wherein the second end cover water channel is arranged in the second end cover; a second flange connecting the casing and the second end cover, wherein the second flange water channel is arranged in the second flange.

7. The electric machine of claim 6, wherein, The composite water channel structure further comprises a stator sleeved on the inner side of the casing, wherein the casing comprises: an inner casing arranged around the outer circumference of the stator; an outer casing coaxially and spacedly arranged with the inner casing; a plurality of water channel ribs welded between the outer casing and the inner casing, wherein the inner space of the casing is divided into multiple water channels by the plurality of water channel ribs.

8. The electric machine of claim 7, wherein, The composite water channel structure further comprises: a rotor inserted into the inner side of the stator; a first bearing mounted between the first end cover and the rotor; a second bearing mounted between the second end cover and the rotor.

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