Rotor liquid cooling structure and stator and rotor series liquid cooling system

Abstract

The invention discloses a rotor liquid cooling structure and a stator and rotor series liquid cooling system, and relates to the technical field of motor / generator heat dissipation, the cooling structure comprises a main shaft, and a rotor front liquid storage area, a rotor iron core and a rotor rear liquid storage area which are installed on the main shaft and are distributed in sequence, the main shaft is of a hollow structure, and a shaft hole is formed in the axial direction; a shaft liquid outlet hole and a shaft liquid inlet hole are formed in the side wall of the shaft hole, a cover plate is further arranged at the rear end of the rotor rear liquid storage area, and a cover plate liquid inlet, a first cover plate liquid outlet and a cover plate liquid return opening are formed in the cover plate; a plurality of rotor matching holes are axially formed in the rotor iron core, communicating pipes are installed in the rotor matching holes, and cooling liquid flows in through the cover plate liquid inlet, sequentially flows through the cover plate liquid inlet pipe, the shaft hole, the shaft liquid outlet hole, the rotor front liquid storage area, the communicating pipes, the rotor rear liquid storage area, the shaft liquid inlet hole and the shaft hole and then flows out through the cover plate liquid return opening. According to the invention, the heat dissipation capability of the rotor part can be obviously improved, the cooling structure is simplified, and the cooling structure can be applied to a motor or a generator to cool the motor or the generator.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of motors / generators, and more specifically, to a rotor liquid cooling structure and a stator-rotor series liquid cooling system. Background Art

[0002] During the operation of the motor, the stator coil will release heat due to the thermal effect of the current. Especially when the motor is overloaded, excessive heat release will cause the stator core and winding to generate high temperatures, affecting the motor performance and even burning the motor. At the same time, due to the influence of hysteresis loss, the rotor part will also generate heat and cause temperature rise, causing the magnetic steel to demagnetize and affecting the motor performance. The motor casing is the main heat exchange part of the motor. The commonly used motor cooling currently mainly adopts the form of circulating water cooling by setting water channels inside the casing or adding passive cooling forms of the casing cooling fins. This cooling method has limited heat dissipation capacity and basically has no cooling effect on the rotor, which is not conducive to improving the performance of the motor.

[0003] In order to improve the heat dissipation capacity of the motor, patent CN202311479242.9 discloses a structure in which a heat dissipation stack is set in the vacant part between the motor end cover and the iron core, and a heat conduction unit is used to dissipate heat. This structure only increases the heat conduction between the stator winding and the casing, and the temperature rise problem of the rotor part is not solved. In addition, the heat exchange capacity between the casing and the front and rear end covers and the air is limited, and the temperature rise problem cannot be effectively controlled. The heat dissipation stack and the heat conduction unit are bound to increase the weight and manufacturing cost of the motor. Summary of the invention

[0004] In view of this, the main purpose of the present invention is to provide a rotor liquid cooling structure to improve the heat dissipation capacity of the rotor part and simplify the cooling structure, which can be used in motors or generators to cool them.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A rotor liquid cooling structure, comprising a main shaft and a rotor core mounted on the main shaft, wherein a cover plate is arranged at one end of the rotor core, wherein the cover plate comprises a cover body, wherein a cover plate liquid inlet pipe and a cover plate liquid return port are arranged on the cover body, wherein one end of the cover plate liquid inlet pipe is the cover plate liquid inlet port, and the other end is the first cover plate liquid outlet port;

[0007] The main shaft is a hollow structure, and an axial hole is formed along the axial direction. The cover plate is located at one end of the opening of the axial hole. A shaft liquid outlet hole and a shaft liquid inlet hole are opened on the side wall of the shaft hole. A separator is arranged between the shaft liquid outlet hole and the shaft liquid inlet hole. The shaft liquid outlet hole is connected to the liquid outlet of the first cover plate, and the shaft liquid inlet hole is connected to the liquid return port of the cover plate.

[0008] The front end of the rotor core is provided with a rotor front pressure plate and a rotor front sealing plate installed on the main shaft, and the rear end of the rotor core is provided with a rotor rear pressure plate and a rotor rear sealing plate installed on the main shaft; a rotor front liquid storage area is formed between the rotor front pressure plate and the rotor front sealing plate, and a rotor rear liquid storage area is formed between the rotor rear pressure plate and the rotor rear sealing plate. A plurality of rotor matching holes are axially arranged on the rotor core, and a connecting pipe is installed in each rotor matching hole;

[0009] The two ends of the connecting pipe are respectively connected to the rotor front liquid storage area and the rotor rear liquid storage area, the liquid inlet end of the rotor front liquid storage area is connected to the shaft liquid outlet hole, and the liquid outlet end of the rotor rear liquid storage area is connected to the shaft liquid inlet hole;

[0010] The coolant flows in through the cover plate liquid inlet, and sequentially flows through the cover plate liquid inlet pipe, the shaft hole, the shaft liquid outlet hole, the rotor front liquid storage area, the connecting pipe, the rotor rear liquid storage area, the shaft liquid inlet hole, the shaft hole, and then flows out through the cover plate liquid return port.

[0011] Furthermore, a front partition rib is provided on the front pressure plate of the rotor, and the front partition rib divides the front liquid storage area of ​​the rotor into multiple parts to form a front liquid storage tank; a front matching hole is provided at the bottom of each front liquid storage tank to form a liquid outlet end of the front liquid storage area of ​​the rotor, and the front matching hole is concentrically arranged with the rotor matching hole; a front liquid hole is radially provided on the mounting sleeve of the front pressure plate of the rotor to form a liquid inlet end of the front liquid storage area of ​​the rotor, and the front liquid hole is concentrically matched with the shaft liquid outlet hole; and the front matching hole and the front liquid hole are distributed in each of the front liquid storage tanks.

[0012] Furthermore, the shaft liquid outlet holes, the front barrier ribs, and the front liquid holes are all 2 to 5 in number, and are evenly distributed in a circular array along the axis of the main shaft.

[0013] Furthermore, a rear partition rib is provided on the rotor rear pressure plate, and the rear partition rib divides the rotor rear liquid storage area into multiple parts to form a rear liquid storage tank; a rear matching hole is provided at the bottom of each rear liquid storage tank to form a liquid inlet end of the rotor rear liquid storage area, and the rear matching hole is concentrically arranged with the rotor matching hole; a rear liquid outlet hole is radially provided on the mounting sleeve of the rotor rear pressure plate to form a liquid outlet end of the rotor rear liquid storage area, and the rear liquid outlet hole is concentrically matched with the shaft liquid inlet hole; and each of the rear liquid storage tanks is provided with the rear matching hole and the rear liquid outlet hole.

[0014] Furthermore, the shaft liquid inlet hole, the rear barrier rib, and the rear liquid outlet hole are all 2 to 5 in number, and are evenly distributed in a circular array along the axis of the main shaft.

[0015] Furthermore, the rotor matching holes are provided in 6 to 18 numbers and are evenly distributed along the circumferential direction of the rotor core, that is, evenly distributed in a circular array along the axis of the rotor core.

[0016] Furthermore, it also includes a hollow tube arranged in the center of the main shaft, one end of the hollow tube is connected to the liquid outlet of the first cover plate, and the other end extends to the shaft liquid outlet hole; the partition is an inner shaft oil seal, which is arranged between the outer wall of the hollow tube and the inner wall of the main shaft.

[0017] The present invention also aims to provide a stator-rotor series liquid cooling system, comprising any of the above-mentioned cooling structures.

[0018] The present invention provides a permanent magnet synchronous motor / generator stator and rotor series liquid cooling system. The liquid cooling series of the motor stator and rotor cooling in this system further improves the heat dissipation and overload capacity of the motor without increasing the motor volume and weight, thereby solving the problem of high heat generation and high heat flux density of the motor / generator.

[0019] Further, it comprises a casing and a stator-rotor connecting pipe, the casing comprises a shell, a spiral water channel and a coolant jacket sealing the spiral water channel are arranged on the outer peripheral side wall of the shell, and the coolant jacket is provided with a casing liquid inlet and a casing liquid outlet communicated with the spiral water channel;

[0020] The cover plate is also provided with a second cover plate liquid outlet which is in communication with the cover plate liquid return port;

[0021] One end of the stator-rotor connecting pipe is connected to the liquid outlet of the second cover plate, and the other end is connected to the liquid inlet of the casing.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The present invention can achieve sufficient heat exchange cooling of the rotor core by setting the main shaft as a hollow structure, combining a cover plate and forming a rotor front liquid storage area and a rotor rear liquid storage area at the front and rear ends of the rotor core, and setting a rotor matching hole inside the rotor core.

[0024] The present invention has a simple structure, and in particular, after adopting a liquid cooling structure in which the stator and rotor are connected in series, the rotor and stator of the entire motor can be cooled simultaneously, which has a significantly improved cooling effect compared to the traditional casing water cooling that only cools the stator and the passive fin heat dissipation structure. During the operation of the motor, the coolant first enters the main shaft through the liquid inlet of the cover plate, and then enters the spiral water channel of the casing through the stator-rotor connecting pipe after sufficient heat exchange in the liquid storage tank, and finally flows out through the casing liquid outlet on the casing, thereby realizing a liquid cooling cycle; thereby taking away the heat from the motor rotor and the casing, greatly improving the heat dissipation efficiency, and reducing the temperature rise inside the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0026] Figure 1 It is an overall cross-sectional view of the motor in the present invention.

[0027] Figure 2 It is a front view of the motor in the present invention.

[0028] Figure 3 It is a cross-sectional view of the main shaft and the rotor core in the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of the casing part of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the front pressure plate of the rotor in the present invention.

[0031] Figure 6 It is a schematic diagram of the structure of the rear pressure plate of the rotor in the present invention.

[0032] Figure 7 It is a structural schematic diagram of the main shaft in the present invention.

[0033] Figure 8 It is a schematic diagram of the cover plate structure in the present invention.

[0034] Fig. 9 It is a schematic diagram of the rotor core structure in the present invention.

[0035] Fig.10 It is a schematic diagram of the connecting pipe structure in the present invention.

[0036] Fig.11 It is a structural schematic diagram of the hollow tube in the present invention.

[0037] Description of reference numerals:

[0038] 1. Stator-rotor connection pipe; 2. Liquid outlet pipe; 3. Liquid inlet pipe; 4. Separator; 5. Hollow pipe; 5.1. Hollow pipe connection end; 6. Casing; 61. Spiral water channel; 62. Shell; 63. Coolant jacket; 64. Casing liquid inlet; 65. Casing liquid outlet;

[0039] 7. Rotor front sealing plate; 8. Rotor front pressure plate; 8.1. Front baffle rib; 8.2. Front liquid storage tank; 8.3. Front matching hole; 8.4. Front liquid hole;

[0040] 9. Connecting pipe; 9.1. Connecting pipe flange; 10. Rear rotor pressure plate; 10.1. Rear spacer rib; 10.2. Rear liquid storage tank; 10.3. Rear liquid outlet hole; 10.4. Rear matching hole;

[0041] 11. Rotor rear sealing plate; 12. Shaft end oil seal; 13. Main shaft; 13.1. Shaft fluid inlet hole; 13.2. Shaft fluid outlet hole; 13.3. Shaft hole; 13.4. Shaft tail end;

[0042] 14. Cover plate; 14.1. Second cover plate liquid outlet; 14.2. Cover plate liquid storage tank; 14.3. Cover plate liquid inlet; 14.4. First cover plate liquid outlet; 14.5. Cover plate liquid return port; 14.6. Cover plate liquid inlet pipe; 14.7. Cover body;

[0043] 15. Rotor core; 15.1. Rotor matching hole; 16. Stator core; 17. Rotor front liquid storage area; 18. Rotor rear liquid storage area. DETAILED DESCRIPTION

[0044] The structure provided by the present invention is explained and illustrated in detail below in conjunction with the accompanying drawings.

[0045] Example 1

[0046] refer to Figures 1 to 11 The present embodiment provides a rotor liquid cooling structure, comprising a main shaft 13 and a rotor core 15 mounted on the main shaft 13, a cover plate 14 is disposed at one end of the rotor core 15, and the cover plate 14 is disposed at the rear end of the rotor core 15, referring to Figure 8 As shown, the cover plate 14 includes a cover body 14.7, the cross section of the cover body 14.7 is generally convex, and a cover plate liquid inlet pipe 14.6 and a cover plate liquid return port 14.5 are provided on the cover body 14.7. One end of the cover plate liquid inlet pipe 14.6 is a cover plate liquid inlet port 14.3, which is used to connect with the liquid inlet pipe 3 and is the starting end for the coolant to enter. The other end of the cover plate liquid inlet pipe 14.6 is a first cover plate liquid outlet 14.4, and the cover plate liquid return port 14.5 can form an annular liquid return port along the outer peripheral side wall of the cover plate liquid inlet pipe 14.6.

[0047] Combination Figure 7 As shown, the main shaft 13 is a hollow structure, and an axial hole 13.3 is formed along the axial direction. The cover plate 14 is located at one end of the opening of the axial hole 13.3. The side wall of the axial hole 13.3 is provided with an axial liquid outlet hole 13.2 and an axial liquid inlet hole 13.1. A separator 4 is provided between the axial liquid outlet hole 13.2 and the axial liquid inlet hole 13.1 to prevent the axial liquid outlet hole 13.2 and the axial liquid inlet hole 13.1 from being directly connected in the axial hole 13.3. The axial liquid outlet hole 13.2 is connected to the first cover plate liquid outlet port 14.4, and the shaft liquid inlet hole 13.1 is connected to the cover plate liquid return port 14.5;

[0048] In some embodiments, the first cover plate liquid outlet 14.4 of the cover plate liquid inlet pipe 14.6 can be directly extended to the shaft liquid outlet hole 13.2, so that the coolant entering through the cover plate liquid inlet pipe 14.6 can flow out through the shaft liquid outlet hole 13.2; of course, a certain gap is formed between the outer wall of the cover plate liquid inlet pipe 14.6 and the inner wall of the main shaft 13, so that the coolant can directly contact the inner wall of the main shaft to improve the cooling effect; and the separator can divide the gap between the main shaft 13 and the cover plate liquid inlet pipe 14.6 into two areas, so that the shaft liquid outlet hole 13.2 is not directly connected to the shaft liquid inlet hole 13.1;

[0049] In some embodiments, a hollow tube 5 can be directly connected to the first cover plate liquid outlet 14.4 of the cover plate liquid inlet pipe 14.6, and combined with Fig.11 One end of the hollow tube 5 connected to the first cover plate liquid outlet 14.4 is the hollow tube connecting end 5.1, and the hollow tube connecting end 5.1 forms an annular step portion, which is convenient for close connection with the first cover plate liquid outlet 14.4; the other end of the hollow tube 5 extends to the shaft liquid outlet hole 13.2; similarly, a certain gap is formed between the outer wall of the hollow tube 5 and the inner wall of the main shaft 13, and the separator can divide the gap between the main shaft 13 and the hollow tube 5 into two areas, so that the shaft liquid outlet hole 13.2 and the shaft liquid inlet hole 13.1 are not directly connected; in this embodiment, the separator 4 is an inner shaft oil seal with a good sealing effect.

[0050] Specifically, in this embodiment, the separator 4 is used to block the communication between the shaft liquid inlet hole 13.1 and the shaft liquid outlet hole 13.2 in the shaft hole 13.3, so as to ensure that the coolant will not flow out through the shaft liquid outlet hole 13.2 after entering the shaft hole 13.3 through the shaft liquid inlet hole 13.1, but will flow out directly through the cover plate liquid return port 14.5, thereby ensuring the unidirectional flow of the coolant;

[0051] Continue to refer Figure 1 , 3 , 5 and 6, the front end of the rotor core 15 is provided with a rotor front pressure plate 8 and a rotor front sealing plate 7 installed on the main shaft 13, and the rear end of the rotor core 15 is provided with a rotor rear pressure plate 10 and a rotor rear sealing plate 11 installed on the main shaft 13; the rotor front pressure plate 8 and the rotor front sealing plate 7 are sealed and connected to form a rotor front liquid storage area 17 located therebetween, and the rotor rear pressure plate 10 and the rotor rear sealing plate 11 are sealed and connected to form a rotor rear liquid storage area 18 located therebetween, and a plurality of rotor matching holes 15.1 are axially arranged on the rotor core 15, and a connecting pipe 9 is installed in each rotor matching hole 15.1, and the connecting pipe 9 can be selected as a hollow copper tube, which has excellent thermal conductivity, good processability and high strength. When the coolant flows in the connecting pipe 9, it can quickly take away the heat inside the rotor core 15;

[0052] The two ends of the connecting pipe 9 are connected to the rotor front liquid storage area 17 and the rotor rear liquid storage area 18 respectively, that is, the rotor front liquid storage area 17 and the rotor rear liquid storage area 18 are connected through the connecting pipe 9, the liquid inlet end of the rotor front liquid storage area 17 is connected to the shaft liquid outlet hole 13.2, and the liquid outlet end of the rotor rear liquid storage area 18 is connected to the shaft liquid inlet hole 13.1;

[0053] Wherein, connecting pipe flanges 9.1 are formed at both ends of the connecting pipe 9, which can make the edge sealing effect of the connecting port better and prevent the coolant from directly entering the rotor core and affecting the rotor performance.

[0054] Specifically, the coolant flows in through the cover plate liquid inlet 14.3, and sequentially flows through the cover plate liquid inlet pipe 14.6, the shaft hole 13.3, the shaft liquid outlet hole 13.2, the rotor front liquid storage area 17, the connecting pipe 9, the rotor rear liquid storage area 18, the shaft liquid inlet hole 13.1, the shaft hole 13.3, and then flows out through the cover plate liquid return port 14.5.

[0055] In this embodiment, the coolant can fully exchange heat with the rotor (including the main shaft and the rotor core), especially the rotor front liquid storage area 17 and the rotor rear liquid storage area 18 can maximize the heat exchange time of the coolant, and after the coolant passes through one end of the rotor core 15, it passes through the inside of the rotor core 15 and finally reaches the other end of the rotor core 15, which can ensure that the rotor core 15 is fully cooled. The coolant enters between the shaft hole 13.3 and the oil seal in the shaft through the liquid outlet end of the rotor rear liquid storage area 18, and then can flow out through the cover plate return liquid port 14.5.

[0056] In some embodiments, in order to prevent the coolant from entering the transformer and stator winding through the gap between the cover plate 14 and the main shaft 13, a shaft end oil seal 12 is arranged between the shaft tail end 13.4 (which is a stepped shaft shape) of the main shaft 13 and the cover plate return liquid port 14.5 of the cover plate 14, which can play the role of dynamic sealing.

[0057] Continue to refer Figure 5 and Figure 6In some preferred embodiments, the rotor front pressure plate 8 is annular, and a pressure plate flange facing the rotor front sealing plate 7 is formed on its edge, so as to form a front liquid storage area 17 of a certain depth between the rotor front sealing plate 7 (in some other embodiments, a flange facing the rotor front pressure plate 8 can also be formed at the edge of the rotor front sealing plate 7, so that a front liquid storage area 17 of a certain depth can also be formed). Furthermore, a front partition rib 8.1 is provided on the rotor front pressure plate 8, and the front partition rib 8.1 divides the rotor front liquid storage area 17 into multiple parts to form a front liquid storage tank 8.2; a front matching hole 8.3 is opened at the bottom of each front liquid storage tank 8.2 to form a liquid outlet end of the rotor front liquid storage area 17, and the front matching hole 8.3 is concentrically arranged with the rotor matching hole 15.1; the installation of the rotor front pressure plate 8 A forward liquid hole 8.4 is radially opened on the sleeve to form the liquid inlet end of the rotor front liquid storage area 17, and the forward liquid hole 8.4 is concentrically matched with the shaft liquid outlet hole 13.2; each front liquid storage tank 8.2 is distributed with a forward liquid hole 8.4; wherein, the shaft liquid outlet hole 13.2, the front baffle rib 8.1, and the forward liquid hole 8.4 are all 2 to 5 in number, and are all evenly distributed in a circular array along the axis of the main shaft 13, and the shaft liquid outlet hole 13.2 corresponds to the forward liquid hole 8.4 one by one. In the illustrated embodiment, the shaft liquid outlet hole 13.2, the front baffle rib 8.1, and the forward liquid hole 8.4 are all 3 in number; each front liquid storage tank 8.2 is formed with a forward liquid hole 8.4 and 4 front matching holes 8.2. Of course, in some other embodiments, the number can be adjusted according to the model and size of different rotor cores 15.

[0058] Similarly, the rotor rear pressure plate 10 is also annular, and a flange is formed on its edge, so as to form a rear liquid storage area 18 of a certain depth between the rotor rear sealing plate 11. Furthermore, a rear partition rib 10.1 is provided on the rotor rear pressure plate 10, and the rear partition rib 10.1 divides the rotor rear liquid storage area 18 into multiple, forming a rear liquid storage tank 10.2; a rear matching hole 10.4 is provided at the bottom of each rear liquid storage tank 10.2, forming a liquid inlet end of the rotor rear liquid storage area 18, and the rear matching hole 10.4 is concentrically arranged with the rotor matching hole 15.1; a rear liquid outlet hole 10.3 is radially provided on the mounting sleeve of the rotor rear pressure plate 10, forming an outlet end of the rotor rear liquid storage area 18. At the liquid end, the rear liquid outlet hole 10.3 is coaxially matched with the shaft liquid inlet hole 13.1; each rear liquid storage tank 10.2 is provided with a rear liquid outlet hole 10.3; wherein, the shaft liquid inlet hole 13.1, the rear baffle rib 10.1, and the rear liquid outlet hole 10.3 are all 2 to 5 in number, and are uniformly distributed in a circular array along the axis of the main shaft 13. In the illustrated embodiment, the shaft liquid inlet hole 13.1, the rear baffle rib 10.1, and the rear liquid outlet hole 10.3 are all 3 in number; each rear liquid storage tank 10.2 is formed with a rear liquid outlet hole 10.3, which corresponds one-to-one to the shaft liquid inlet hole 13.1; in some other embodiments, the quantity can also be adjusted according to the model and size of different rotor cores 15.

[0059] A groove is radially formed in each rear liquid storage tank 10.2 at the position corresponding to the rear liquid outlet hole 10.3, so as to facilitate the coolant to flow out through the rear liquid outlet hole 10.3 and play a certain guiding role.

[0060] There are 6 to 18 rotor mating holes 15.1, which are evenly distributed along the circumference of the rotor core 15; in the illustrated embodiment, there are 12 rotor mating holes 15.1, and correspondingly, there are 12 front mating holes 8.2 and 12 rear mating holes 10.4, each rear liquid storage tank 10.2 is distributed with 4 rear mating holes 10.4, and each front liquid storage tank 8.2 is also distributed with 4 front mating holes 8.2.

[0061] The front liquid storage area 17 of the rotor is divided into three front liquid storage tanks 8.2 by the front partition rib 8.1, and the rear liquid storage area 18 of the rotor is divided into three rear liquid storage tanks 10.2 by the rear partition rib 10.1, so that the coolant in the front liquid storage area 17 of the rotor and the rear liquid storage area 18 of the rotor is more evenly distributed, further improving the cooling effect on both ends of the rotor core.

[0062] Example 2

[0063] This embodiment provides a stator-rotor series liquid cooling system, comprising the rotor liquid cooling structure described in any one of the above-mentioned Embodiment 1.

[0064] Specifically, in this embodiment, the stator-rotor series liquid cooling system includes a housing 6 and a stator-rotor connecting pipe 1, such as Figure 4 As shown, the casing 6 is roughly cylindrical, and end covers are provided at both ends. The above-mentioned rotor liquid cooling structure is arranged in the casing 6. It can be understood that other structures such as the stator core 16 and the stator winding are also installed inside the casing 6. The stator core 16 is attached to the inner wall of the casing 6 and is located at the outer periphery of the rotor core 15. The stator winding and other structures can be connected and arranged according to the existing conventional technology;

[0065] The casing 6 includes a shell 62, on the outer peripheral side wall of the shell 62 is provided a spiral water channel 61 and a coolant jacket 63 sealing the spiral water channel 61, and the coolant jacket 63 is provided with a casing liquid inlet 64 and a casing liquid outlet 65 which are communicated with the spiral water channel 61;

[0066] The cover plate 14 is also provided with a second cover plate liquid outlet 14.1 connected with the cover plate liquid return port 14.5. Specifically, the second cover plate liquid outlet 14.1 is opened on the side wall of the cover body 14.7; the cover plate liquid return port 14.5 is connected with the second cover plate liquid outlet 14.1; a cover plate liquid storage tank 14.2 is formed in the cover body 14.7 between the cover plate liquid return port 14.5 and the second cover plate liquid outlet 14.1, which can store a certain amount of coolant to achieve a buffering effect;

[0067] One end of the stator-rotor connecting pipe 1 is connected to the second cover plate liquid outlet 14 . 1 , and the other end is connected to the casing liquid inlet 64 . A liquid outlet connecting pipe 2 is provided at the casing liquid outlet 65 .

[0068] The coolant (generally cooling water) enters between the shaft hole 13.3 of the main shaft 13 and the hollow tube 5 through the rear outlet hole 10.3 of the rotor rear pressure plate 10 and the shaft inlet hole 13.1 of the main shaft 13. Due to the obstruction of the inner shaft oil seal and the shaft end oil seal 12, the coolant enters the cover plate liquid storage tank 14.2 of the cover plate 14, and enters the stator-rotor connecting pipe 1 through the second cover plate outlet 14.1 of the cover plate. After the coolant passes through the rotor (main shaft and rotor core), it is led out to the spiral water channel 61 of the casing 6, and finally the coolant flows out through the casing outlet 65, realizing the series connection of stator-rotor liquid cooling. The coolant entering the spiral water channel 61 of the casing, after sufficient contact with the casing, takes away the heat transferred from the stator core 16 to the casing 6, thereby realizing the simultaneous cooling of the motor stator and rotor, improving the heat exchange efficiency, and improving the motor performance, especially the performance when the motor is overloaded with a large current.

[0069] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and simple improvements made to the essential contents of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor liquid cooling structure, characterized in that: The invention comprises a main shaft (13) and a rotor core (15) mounted on the main shaft (13); a cover plate (14) is arranged at one end of the rotor core (15); the cover plate (14) comprises a cover body (14.7); a cover plate liquid inlet pipe (14.6) and a cover plate liquid return port (14.5) are arranged on the cover body (14.7); one end of the cover plate liquid inlet pipe (14.6) is a cover plate liquid inlet port (14.3), and the other end is a first cover plate liquid outlet port (14.4); The main shaft (13) is a hollow structure, and an axial hole (13.3) is formed along the axial direction. The cover plate (14) is located at one end of the opening of the axial hole (13.3). A axial liquid outlet hole (13.2) and a axial liquid inlet hole (13.1) are provided on the side wall of the axial hole (13.3). A separator (4) is provided between the axial liquid outlet hole (13.2) and the axial liquid inlet hole (13.1). The axial liquid outlet hole (13.2) is in communication with the first cover plate liquid outlet port (14.4), and the axial liquid inlet hole (13.1) is in communication with the cover plate liquid return port (14.5). The front end of the rotor core (15) is provided with a rotor front pressure plate (8) and a rotor front sealing plate (7) mounted on the main shaft (13), and the rear end of the rotor core (15) is provided with a rotor rear pressure plate (10) and a rotor rear sealing plate (11) mounted on the main shaft (13); a rotor front liquid storage area (17) is formed between the rotor front pressure plate (8) and the rotor front sealing plate (7), and a rotor rear liquid storage area (18) is formed between the rotor rear pressure plate (10) and the rotor rear sealing plate (11); a plurality of rotor matching holes (15.1) are axially provided on the rotor core (15), and a connecting pipe (9) is installed in each rotor matching hole (15.1); The two ends of the connecting pipe (9) are respectively connected to the rotor front liquid storage area (17) and the rotor rear liquid storage area (18); the liquid inlet end of the rotor front liquid storage area (17) is connected to the shaft liquid outlet hole (13.2), and the liquid outlet end of the rotor rear liquid storage area (18) is connected to the shaft liquid inlet hole (13.1); The coolant flows in through the cover plate liquid inlet (14.3), and sequentially flows through the cover plate liquid inlet pipe (14.6), the shaft hole (13.3), the shaft liquid outlet hole (13.2), the rotor front liquid storage area (17), the connecting pipe (9), the rotor rear liquid storage area (18), the shaft liquid inlet hole (13.1), the shaft hole (13.3), and then flows out through the cover plate liquid return port (14.5).

2. The cooling structure according to claim 1, characterized in that: The rotor front pressure plate (8) is provided with a front partition rib (8.1), and the front partition rib (8.1) divides the rotor front liquid storage area (17) into multiple parts to form a front liquid storage tank (8.2); a front matching hole (8.3) is opened at the bottom of each front liquid storage tank (8.2) to form a liquid outlet end of the rotor front liquid storage area (17), and the front matching hole (8.3) is concentrically arranged with the rotor matching hole (15.1); a forward liquid hole (8.4) is radially opened on the mounting sleeve of the rotor front pressure plate (8) to form a liquid inlet end of the rotor front liquid storage area (17), and the forward liquid hole (8.4) is concentrically matched with the shaft liquid outlet hole (13.2); the forward liquid holes (8.4) are distributed in each of the front liquid storage tanks (8.2).

3. The cooling structure according to claim 2, characterized in that: The shaft liquid outlet holes (13.2), the front barrier ribs (8.1), and the front liquid holes (8.4) are all 2 to 5 in number and are evenly distributed in a circular array along the axis of the main shaft (13).

4. The cooling structure according to claim 1, characterized in that: The rotor rear pressure plate (10) is provided with a rear partition rib (10.1), and the rear partition rib (10.1) divides the rotor rear liquid storage area (18) into multiple parts to form a rear liquid storage tank (10.2); a rear matching hole (10.4) is provided at the bottom of each rear liquid storage tank (10.2) to form a liquid inlet end of the rotor rear liquid storage area (18), and the rear matching hole (10.4) is concentrically arranged with the rotor matching hole (15.1); a rear liquid outlet hole (10.3) is radially provided on the mounting sleeve of the rotor rear pressure plate (10) to form a liquid outlet end of the rotor rear liquid storage area (18), and the rear liquid outlet hole (10.3) is concentrically matched with the shaft liquid inlet hole (13.1); each of the rear liquid storage tanks (10.2) is provided with the rear liquid outlet hole (10.3).

5. The cooling structure according to claim 4, characterized in that: The shaft liquid inlet hole (13.1), the rear barrier rib (10.1), and the rear liquid outlet hole (10.3) are all 2 to 5 in number and are evenly distributed in a circular array along the axis of the main shaft (13).

6. The cooling structure according to claim 1, characterized in that: The rotor matching holes (15.1) are provided in a number of 6 to 18 and are evenly distributed along the circumference of the rotor core (15).

7. The cooling structure according to claim 1, characterized in that: It also includes a hollow tube (5) arranged at the center of the main shaft (13), one end of the hollow tube (5) is connected to the first cover plate liquid outlet (14.4), and the other end extends to the shaft liquid outlet hole (13.2); the separator (4) is an inner shaft oil seal, which is arranged between the outer side wall of the hollow tube (5) and the inner side wall of the main shaft (13).

8. A stator-rotor series liquid cooling system, characterized in that: Comprising the cooling structure described in any one of claims 1 to 7.

9. The cooling system according to claim 8, characterized in that: The invention comprises a casing (6) and a stator-rotor connecting pipe (1), wherein the casing (6) comprises a shell (62), a spiral water channel (61) and a cooling liquid jacket (63) sealing the spiral water channel (61) are arranged on the outer peripheral side wall of the shell (62), and a casing liquid inlet (64) and a casing liquid outlet (65) which are in communication with the spiral water channel (61) are arranged on the cooling liquid jacket (63); The cover plate (14) is also provided with a second cover plate liquid outlet (14.1) which is in communication with the cover plate liquid return port (14.5); One end of the stator-rotor connecting pipe (1) is connected to the second cover plate liquid outlet (14.1), and the other end is connected to the casing liquid inlet (64).

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