Cooling structure, cooling system, stator assembly, motor, actuator and vehicle

Abstract

The invention relates to the technical field of motors, and provides a cooling structure, a cooling system, a stator assembly, a motor, an actuator and a vehicle, the cooling structure comprises a cooling liquid path, a cooling liquid cavity and a shunting channel, the cooling liquid path is formed in a stator core, the cooling liquid cavity is arranged independent of the stator core, and the shunting channel is formed in the stator core. The flow dividing channel is communicated with the cooling liquid path and the cooling liquid cavity, and the cooling working medium flows to the cooling liquid path and the cooling liquid cavity along the flow dividing channel. According to the technical scheme, the cooling working medium can enter the cooling liquid path on the stator iron core and the cooling liquid cavity independent of the stator iron core along the shunting channel, the stator iron core is cooled, meanwhile, the cooling liquid cavity can be used for cooling parts except the stator iron core, the cooling effect is good, and the cooling efficiency is improved. And the operation stability of the motor is ensured.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a cooling structure, a cooling system, a stator assembly, a motor, an actuator, and a vehicle. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its main function is to generate driving torque. As a power source for electrical appliances or various machines, it generates heat during operation and affects the operating stability of the motor.

[0003] In the related art, a cooling medium is used to flow along a cooling flow path to cool the motor.

[0004] However, the existing cooling flow path has a poor cooling effect on the motor. Summary of the Invention

[0005] Embodiments of the present application provide a cooling structure, a cooling system, a stator assembly, a motor, an actuator, and a vehicle, which improve the safety of the cooling effect on the motor, thereby at least partially solving the above-mentioned technical problems.

[0006] In order to achieve the above object, according to a first aspect of the present application, a cooling structure is provided, comprising:

[0007] A cooling liquid path is formed in the stator core;

[0008] A cooling liquid chamber is provided independently of the stator core; and

[0009] A shunt channel for allowing a cooling medium to flow through the cooling liquid path and the cooling liquid cavity;

[0010] Wherein, the diversion channel is connected to the cooling liquid path and the cooling liquid cavity respectively.

[0011] Optionally, the diversion channel includes:

[0012] a first sub-channel, configured to communicate with the cooling liquid path;

[0013] a second sub-channel, configured to communicate with the cooling liquid cavity;

[0014] The first sub-channel is connected to the second sub-channel, and the pressure of the working fluid flowing through the first sub-channel is different from the pressure of the working fluid flowing through the second sub-channel.

[0015] Optionally, the cooling liquid circuit includes at least two cooling units, and the cooling units are distributed along the circumference of the stator core;

[0016] The cooling medium can flow into the cooling unit along the first sub-flow channel.

[0017] Optionally, the cooling liquid circuit includes:

[0018] a first cooling liquid passage, for supplying cooling medium to the cooling liquid passage;

[0019] a second coolant passage, for allowing the cooling medium to flow out of the coolant passage;

[0020] The first coolant junction has two branches, so that the cooling medium flows along the branches to the second coolant junction respectively.

[0021] Optionally, the circumferential arc between the first coolant passage and the second coolant passage is 90° or 180°.

[0022] Optionally, the cooling unit includes:

[0023] An axial fluid path defines an axial flow direction for the cooling medium to flow along the axial direction of the stator core;

[0024] a radial fluid path defining a radial flow direction for causing the cooling medium to flow radially along the stator core; and

[0025] a circumferential fluid path defining a circumferential flow direction for causing the cooling medium to flow along the circumference of the stator core;

[0026] The radial fluid path is located between the axial fluid path and the circumferential fluid path, and the axial fluid path is connected to the circumferential fluid path through the radial fluid path.

[0027] Optionally, two adjacent cooling units in the same branch are connected through the circumferential liquid path.

[0028] Optionally, the axial flow direction defined by the axial fluid path has two opposite directions or two relative directions.

[0029] Optionally, the axial fluid path passes through both ends of the stator core.

[0030] Optionally, the cooling structure further comprises:

[0031] a liquid inlet channel, configured to communicate with the diversion channel;

[0032] The cooling medium flows along the liquid inlet channel into the diversion channel.

[0033] Optionally, the liquid inlet channel defines two flow directions for the cooling medium to pass through;

[0034] The two flow directions are arranged opposite to each other based on the symmetry axis of the stator core.

[0035] Optionally, the cooling structure further comprises:

[0036] A first type of liquid outlet channel is configured to communicate with the cooling liquid cavity;

[0037] a liquid passage connecting the first type of liquid outlet passage and the cooling liquid cavity;

[0038] Wherein, the cooling liquid cavity is connected with the first type of liquid outlet channel through the liquid passage.

[0039] Optionally, the cooling structure further comprises:

[0040] a second type of liquid outlet channel, configured to communicate with the cooling liquid path;

[0041] The cooling medium in the first type of liquid outlet channel and the cooling medium in the second type of liquid outlet channel flow independently.

[0042] Optionally, the first type of liquid outlet channel has a first type of liquid outlet for allowing the cooling medium to pass through, and the second type of liquid outlet channel has a second type of liquid outlet for allowing the cooling medium to pass through;

[0043] Wherein, the first type of liquid outlet and the second type of liquid outlet are located in different planes.

[0044] Optionally, the first type of liquid outlet channel and the second type of liquid outlet channel are connected to the same external oil tank through different pipelines.

[0045] Optionally, the cooling structure further comprises:

[0046] The return oil chamber is configured to communicate with the first type of liquid outlet channel.

[0047] Optionally, the cooling liquid chamber includes a liquid collecting chamber and a liquid spraying chamber, and the liquid collecting chamber is connected between the diversion channel and the liquid spraying chamber;

[0048] The cooling structure further comprises:

[0049] a liquid spraying channel, configured to communicate with the liquid collecting chamber and the liquid spraying chamber;

[0050] Wherein, the liquid spray channel has a liquid spray outlet for allowing the cooling medium to pass through, and the diversion channel has a diversion liquid port for allowing the cooling medium to pass through;

[0051] The cooling medium can flow from the diversion liquid outlet to the liquid spray outlet.

[0052] According to a second aspect of the present application, a cooling system is provided, comprising the cooling structure as described above.

[0053] Optionally, the cooling system further includes:

[0054] A reversing switch is used to switch the flow direction of the cooling medium of the cooling structure.

[0055] Optionally, the cooling system further includes:

[0056] The heat exchanger is used to exchange heat with the cooling medium to adjust the temperature of the cooling medium.

[0057] According to a third aspect of the present application, a stator assembly is provided, comprising the cooling structure as described above.

[0058] Optionally, the stator assembly includes:

[0059] a stator core, used for forming the cooling liquid path;

[0060] A shunt member connected to the stator core;

[0061] Wherein, the shunt channel of the cooling structure is formed at least between the shunt member and the stator core; and

[0062] The cooling liquid chamber is formed at least between the shell and the diverter.

[0063] Optionally, the diverter is provided at both axial ends of the stator core;

[0064] Wherein, the diverter comprises:

[0065] A body connected to the stator core;

[0066] a recessed portion, provided on the body;

[0067] Wherein, a first sub-flow channel of the shunt channel is formed between the recess and the end surface of the stator core.

[0068] Optionally, the second sub-channel of the diverter channel passes through both ends of the diverter along the axial direction of the diverter.

[0069] Optionally, the diverter is provided with:

[0070] a closing portion adapted to close both ends of the other cooling liquid paths connected to the first sub-channel;

[0071] Wherein, the circumferential liquid path of the cooling liquid path is formed in the diverter and / or the stator core.

[0072] Optionally, the housing is formed with:

[0073] a first opening for forming one of the first coolant passage and the second coolant passage,

[0074] a second opening for forming the other of the first coolant passage and the second coolant passage;

[0075] The first opening and the second opening have the same structure.

[0076] Optionally, the stator assembly further includes:

[0077] a liquid spraying member located in the inner space of the shell and sealedly connected to the shell, the liquid spraying member being used to separate the cooling liquid chamber into a liquid collecting chamber and a liquid spraying chamber;

[0078] The liquid spraying channel of the cooling structure is arranged on the circumference of the liquid spraying member, and the liquid spraying member is suitable for applying a force to the diverter member so that the diverter member tends to approach the stator core, so that the diverter member fits the liquid spraying member.

[0079] According to a fourth aspect of the present application, an actuator and a motor are provided, comprising the cooling structure as described above or the stator assembly as described above.

[0080] According to the fifth aspect of the present application, an actuator is provided, comprising a first component and a second component, wherein the first component and the second component rotate relative to each other around the axial direction of the actuator, one of the first component and the second component comprises the stator component as described above, and the other of the first component and the second component comprises a rotor component.

[0081] According to a sixth aspect of the present application, a vehicle is provided, comprising the cooling structure as described above, the cooling system as described above, or the stator assembly as described above.

[0082] The beneficial effects of the present application are: providing a cooling structure, a cooling system, a stator assembly, a motor and a vehicle with good cooling effect on the motor.

[0083] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0084] In the cooling structure of the embodiment of the present application, the cooling structure includes: a cooling liquid path, a cooling liquid cavity, and a shunt channel, wherein the cooling liquid path is formed in the stator core, the cooling liquid cavity is set independently of the stator core, and the shunt channel is used to allow the cooling medium to flow through the cooling liquid path and the cooling liquid cavity, wherein the shunt channel is connected to the cooling liquid path and the cooling liquid cavity respectively. Through the above technical solution, the shunt channel allows the cooling medium to flow through the cooling liquid path on the stator core and the cooling liquid cavity set independently of the stator core. The setting of the shunt channel makes the flow direction of the cooling medium reasonably configured, which can effectively correspond to the area where the motor generates heat, has a good cooling effect, and ensures the stability of the motor operation.

[0085] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0087] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0088] Figure 1 is a cross-sectional view of a motor structure provided in an exemplary embodiment of the present application;

[0089] Figure 2 is a schematic diagram of the connection between the stator core and the shunt provided in an exemplary embodiment of the present application;

[0090] Figure 3 This is provided in the exemplary embodiment of the present application Figure 2 A is an enlarged schematic diagram;

[0091] Figure 4 This is provided in the exemplary embodiment of the present application Figure 2 An enlarged schematic diagram of point B in FIG.

[0092] Figure 5 Schematic diagram of the filling space of the cooling liquid circuit of the present application;

[0093] Figure 6 This is provided in the exemplary embodiment of the present application Figure 5 The enlarged schematic diagram of point C in FIG.

[0094] Figure 7 This is provided in the exemplary embodiment of the present application Figure 5 The enlarged schematic diagram of point D in FIG.

[0095] Figure 8 is a schematic diagram of a liquid circuit of a cooling system provided in an exemplary embodiment of the present application;

[0096] Figure 9 1 is a schematic structural diagram of one end surface of a diverter provided in an exemplary embodiment of the present application;

[0097] Figure 10 is a schematic structural diagram of the other end face of the diverter provided in an exemplary embodiment of the present application;

[0098] Figure 11 is a schematic structural diagram of a stator core provided in an exemplary embodiment of the present application;

[0099] Figure 12 2 is a schematic structural diagram of two adjacent groups of cooling liquid paths connected via a first type of cross-connected liquid path provided in an exemplary embodiment of the present application;

[0100] Figure 13 1 is a schematic structural diagram of a stator core provided in an exemplary embodiment of the present application, in which a cooling liquid path is provided;

[0101] Figure 14 is a schematic structural diagram of a liquid spraying member provided in an exemplary embodiment of the present application;

[0102] Figure 15 is a schematic cross-sectional structural diagram of a liquid spraying member provided in an exemplary embodiment of the present application;

[0103] Figure 16 is a schematic diagram of a liquid circuit of another cooling system provided in an exemplary embodiment of the present application;

[0104] Figure 17 This is a schematic structural diagram of a diverter member of another structure provided in an exemplary embodiment of the present application;

[0105] Figure 18 yes Figure 17 The enlarged schematic diagram of point E in FIG.

[0106] Figure 19 1 is a schematic diagram of a layout of a cooling liquid circuit provided in an exemplary embodiment of the present application;

[0107] Figure 20 Schematic diagram of the cooling medium flow direction of the cooling liquid circuit provided in an exemplary embodiment of the present application;

[0108] Figure 21 1 is a flow diagram of a cooling liquid circuit with two branches provided in an exemplary embodiment of the present application;

[0109] Figure 22 is a schematic diagram of a vehicle process provided in an exemplary embodiment of the present application;

[0110] Description of reference numerals:

[0111] 10. Cooling structure;

[0112] 110, coolant passage; 110a, first coolant passage junction; 110b, second coolant passage junction;

[0113] 11a. Cooling unit;

[0114] 111. Axial fluid path; 112. Circumferential fluid path; 113. Radial fluid path

[0115] 11a1, first cooling unit; 114, first axial liquid path; 115, first circumferential liquid path; 116, first radial liquid path;

[0116] 11a2, second cooling unit; 117, second axial liquid path; 118, second circumferential liquid path; 119, second radial liquid path;

[0117] 120. Cooling liquid chamber; 121. Liquid collecting chamber; 122. Liquid spraying chamber;

[0118] 130, diversion channel; 131, first sub-channel; 132, second sub-channel;

[0119] 140, liquid inlet channel; 150, first type liquid outlet channel; 160, liquid passage channel; 170, second type liquid outlet channel; 180, return oil chamber; 190, liquid injection channel;

[0120] 20. Cooling system; 200. Reversing switch; 210. Reversing valve;

[0121] 300, heat exchanger; 400, fuel tank;

[0122] 30. Stator assembly;

[0123] 320, stator core; 140a, symmetry axis;

[0124] 330, diverter; 331, body; 332, recess; 333, closing portion;

[0125] 340, liquid spraying parts; 350, stator winding;

[0126] 40. rotor assembly; 410. rotor core;

[0127] 1. Motor; 50. Housing; 50a. Space within the housing; 510. End cover; 520. Main body; 50b. First opening;

[0128] H, vehicle; f1, axial flow direction; f2, radial flow direction; f3, circumferential flow direction. DETAILED DESCRIPTION

[0129] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0130] According to the first aspect of this application, reference Figures 1 to 16 , provides a cooling structure 10, which includes: a cooling liquid path 110, a cooling liquid cavity 120 and a diversion channel 130.

[0131] Among them, the cooling liquid path 110 is formed in the stator core 320, the cooling liquid cavity 120 is set independently of the stator core 320, and the shunt channel 130 is respectively connected to the cooling liquid path 110 and the cooling liquid cavity 120, wherein the cooling medium flows along the shunt channel 130 to the cooling liquid path 110 and the cooling liquid cavity 120 respectively.

[0132] Through the above technical solution, the shunt channel 130 allows the cooling medium to flow through the cooling liquid path 110 on the stator core 320 and the cooling liquid chamber 120 set independently of the stator core 320. The setting of the shunt channel 130 makes the flow direction of the cooling medium reasonably configured, which can effectively correspond to the area where the motor generates heat, has a good cooling effect, ensures the stability of the motor operation, and ensures the stability of the operation of the motor 1.

[0133] For example, refer to Figure 1 The cooling structure 10 can cool the stator core 320 and can also use the cooling liquid cavity 120 to cool components other than the stator core 320 .

[0134] It is worth noting that cooling components other than the stator core 320, for example, the ends of the stator winding 350 and components in the middle of the motor 1, can be performed, thereby achieving uniform cooling of the motor 1 and ensuring operational stability and reliability of the motor 1.

[0135] The cooling structure 10 can cool the stator core 320 and can also uniformly cool the stator winding 350. Among them, uniform cooling refers to cooling the ends and middle parts of the stator winding 350, and can also cool the overlapping parts of the stator core 320 and the stator winding 350, with good cooling effect.

[0136] The liquid in the cooling liquid cavity and the cooling liquid circuit in this application mainly refers to liquid cooling medium, such as cooling oil, or other liquid cooling medium.

[0137] In some embodiments, reference Figure 1 and Figure 3 The branch channel 130 includes a first sub-channel 131 and a second sub-channel 132 .

[0138] The first sub-channel 131 is configured to communicate with the cooling liquid path 110 , and the second sub-channel 132 is configured to communicate with the cooling liquid cavity 120 . The first sub-channel 131 is connected to the second sub-channel 132 .

[0139] The pressure of the working fluid flowing through the first sub-channel 131 is set to be different from the pressure of the working fluid flowing through the second sub-channel 132 .

[0140] By dividing the diversion channel 130 into a first sub-channel 131 and a second sub-channel 132, and the first sub-channel 131 and the second sub-channel 132 are connected to the cooling liquid path 110 and the cooling liquid cavity 120 respectively, the pressure of the working fluid flowing through the first sub-channel 131 and the pressure of the working fluid flowing through the second sub-channel 132 are set differently, so that the pressure of the cooling working fluid flowing into the cooling liquid path 110 and the cooling liquid cavity 120 are set differently, which can achieve more efficient spray cooling of the end of the stator winding 350, thereby reducing the friction loss of the rotor caused by the working fluid.

[0141] Among them, the working fluid pressure flowing from the second sub-channel 132 to the cooling liquid chamber 120 can be adjusted by adjusting the cross-sectional area of the second sub-channel 132, and then the working fluid pressure in the cooling liquid chamber 120 can be adjusted to further improve the cooling effect of the stator winding 350. The cross-sectional area of the second sub-channel 132 is set accordingly according to actual use.

[0142] For example, the cross-sectional area of the second sub-channel 132 can be set to be smaller than the cross-sectional area of the first sub-channel 131, and the cross-sectional area of the second sub-channel 132 itself is also smaller, so that the flow rate of the cooling medium is kept small, and the cross-sectional area of the second sub-channel 132 is set to be smaller, thereby increasing the pressure of the working fluid when flowing out of the second sub-channel 132.

[0143] In some embodiments, the cooling liquid circuit 110 includes at least two cooling units 11 a .

[0144] The cooling units 11 a are distributed along the circumference of the stator core 320 , wherein the cooling medium flows into the cooling units 11 a along the first sub-flow channel 131 .

[0145] By distributing at least two cooling units 11a circumferentially around the stator core 320, the cooling medium can flow circumferentially around the stator core 320. During the flow, the cooling medium is closer to the heated stator winding 350, and can absorb the heat generated by the stator winding 350 in a timely manner, thereby further improving the cooling effect on the stator winding 350.

[0146] In the present application, the number of cooling units 11 a can be set to six, and they are symmetrically arranged relative to the symmetry axis 140 a of the stator core 320 .

[0147] In some embodiments, reference Figure 16 The cooling liquid path 110 includes a first cooling liquid path opening 110a and a second cooling liquid path opening 110b.

[0148] The first cooling liquid passage 110 a is used for allowing the cooling medium to flow into the cooling liquid passage 110 , and the second cooling liquid passage 110 b is used for allowing the cooling medium to flow out of the cooling liquid passage 110 .

[0149] The first cooling liquid port 110a has two branches, so that the cooling medium flows along the branches to the second cooling liquid port 110b respectively.

[0150] By utilizing the two branches of the first cooling liquid outlet 110a, the cooling medium can flow along the branches to the second cooling liquid outlet 110b respectively, so that the cooling liquid path 110 in the present application can define at least two different circumferential flow directions, so that the cooling medium can flow along the circumferential branches respectively, thereby enabling the cooling medium to cool the stator core 320 along a shorter cooling path, thereby improving the cooling efficiency.

[0151] It should be noted that the number of first coolant ports 110a and second coolant ports 110b in the present application is one-to-one corresponding, that is, they appear in pairs, and when multiple first coolant ports 110a are provided, a second coolant port is required to be provided on both sides of a first coolant port, so that there is a second coolant port 110b between two adjacent first coolant ports 110a, so that the cooling medium can smoothly flow from the first coolant port 110a along the circumferential branch of the stator core 320 to the second coolant port 110b, so as to flow out of the cooling liquid path 110.

[0152] In some embodiments, reference Figure 5 , the circumferential arc between the first coolant passage 110a and the second coolant passage 110b can be set to 180°, and the coolant passage only includes one first coolant passage 110a and one second coolant passage 110b.

[0153] Of course, reference Figure 16 The circumferential arc between the first coolant passage 110a and the second coolant passage 110b can also be set to 90°. In this case, the coolant passage only includes two first coolant passages 110a and two second coolant passages 110b. In this case, there is a second coolant passage 110b between two adjacent first coolant passages 110a.

[0154] In some embodiments, reference Figure 19 The cooling unit includes: an axial liquid path 111 , a radial liquid path 113 and a circumferential liquid path 112 .

[0155] Among them, the axial liquid path 111 defines an axial flow direction for the cooling medium to flow along the axial direction of the stator core 320, the radial liquid path 113 defines a radial flow direction for the cooling medium to flow along the axial direction of the stator core 320, and the circumferential liquid path 112 defines a circumferential flow direction for the cooling medium to flow along the circumference of the stator core 320.

[0156] The radial liquid path 113 is located between the axial liquid path 111 and the circumferential liquid path 112 , and the axial liquid path 111 is connected to the circumferential liquid path 112 through the radial liquid path 113 , so that the cooling medium flows along the circumferential liquid path 112 through the radial liquid path 113 to the axial liquid path 111 .

[0157] By making each cooling unit include an axial liquid path 111, a radial liquid path 113 and a circumferential liquid path 112, the cooling medium can flow along the circumferential liquid path 112 through the radial liquid path 113 to the axial liquid path 111, completing the flow of the cooling medium between the liquid paths of the cooling unit, and realizing the flow of the cooling medium in the axial, radial and circumferential directions.

[0158] In some embodiments, reference Figure 20 The axial flow direction f1, the radial flow direction f2 and the circumferential flow direction f3 are arranged perpendicular to each other.

[0159] By arranging the axial flow direction f1, the radial flow direction f2 and the circumferential flow direction f3 perpendicular to each other, the pressure loss of the cooling medium can be better controlled, thereby avoiding excessive pressure loss of the cooling medium and facilitating the molding of the cooling structure 10.

[0160] In some embodiments, reference Figure 19 and Figure 20 The circumferential liquid path 112 of one cooling unit 11a in the same branch is connected to the circumferential liquid path 112 of another adjacent cooling unit 11a, realizing the series arrangement between the cooling units in the same circumferential flow direction.

[0161] It should be noted that, reference Figure 5 In each cooling unit 11a flowing along the F1 direction, the circumferential liquid path 112 of one cooling unit 11a is connected to the circumferential liquid path 112 of another adjacent cooling unit 11a; in each cooling unit 11a flowing along the F2 direction, the circumferential liquid path 112 of one cooling unit 11a is connected to the circumferential liquid path 112 of another adjacent cooling unit 11a.

[0162] refer to Figure 19 , which is a schematic diagram of the circumferential liquid path 112 of one cooling unit 11a being connected to the circumferential liquid path 112 of another adjacent cooling unit 11a, Figure 20It is the flow direction of the cooling medium between the two cooling units.

[0163] In some embodiments, reference Figure 21 , the axial flow direction defined by the axial liquid path 111 in the first cooling unit 11a1 can have two opposite directions or two relative directions.

[0164] Since the axial flow directions defined by the axial liquid path 111 have two opposite directions, the axial liquid path 111 is defined as a first axial liquid path 114 .

[0165] After the cooling medium enters the first axial liquid path 114, it flows in two opposite directions in the first axial liquid path 114. At this time, after the cooling medium flows to both ends of the first axial liquid path 114, the temperature of the cooling medium can remain roughly consistent, avoiding the problem of poor cooling effect caused by the cooling medium's temperature rising significantly due to the excessive length of the cooling channel after the cooling medium flows from one end to the other end along the cooling liquid path 110.

[0166] In another embodiment, reference Figure 21 The axial flow direction defined by the axial liquid path 111 may also have two opposite directions, and the axial liquid path 111 may be defined as a second axial liquid path 117 .

[0167] For example, the flow directions of the second axial fluid paths 117 of the second cooling unit 11 a 2 communicating with the first cooling unit 11 a 1 may be arranged to be opposite to each other.

[0168] After the cooling medium flows into the second axial liquid path 117, the cooling medium in the second axial liquid path 117 can flow and converge to the middle of the second axial liquid path 117. At this time, the temperature of the cooling medium at both ends of the second axial liquid path 117 can be kept roughly consistent, and the temperature of the cooling medium flowing to the middle position of the second axial liquid path 117 is also roughly consistent, avoiding the problem of poor cooling effect caused by the cooling medium's temperature rising significantly due to the excessive length of the cooling channel after the cooling medium flows from one end to the other end of the second axial liquid path 117.

[0169] At this time, the coordinated use of the first axial liquid path 114 and the second axial liquid path 117 can improve the cooling efficiency of the motor 1 .

[0170] refer to Figure 19, take two adjacent cooling units as an example, which are defined as a first cooling unit 11a1 and a second cooling unit 11a2 respectively, wherein the liquid paths in the first cooling unit 11a1 are defined as a first axial liquid path 114, a first radial liquid path 116 and a first circumferential liquid path 115, and the liquid paths in the second cooling unit 11a2 are defined as a second axial liquid path 117, a second radial liquid path 113 and a second circumferential liquid path 118. The first cooling unit 11a1 and the second cooling unit 11a2 can be connected through the first circumferential liquid path 115 and the second circumferential liquid path 118, thereby realizing the series connection between the cooling units 11a, and the cooling medium in each cooling unit can be connected along the radial liquid path 113-axial liquid path 111-radial liquid path 113-circumferential liquid path 112, and the flow direction of the cooling medium is actually set according to the actual direction of the cooling medium.

[0171] The flow directions of the first axial liquid path 114 of the first cooling unit 11 a 1 and the second axial liquid path 117 of the second cooling unit 11 a 2 are opposite to each other.

[0172] Taking the flow of the cooling medium from the first cooling unit 11a1 to the second cooling unit 11a2 as an example, the cooling medium flows along the first circumferential liquid path 115 to the first radial liquid path 116 to the first axial liquid path 114, and flows along the first axial liquid path 114 to the first radial liquid path 116, and then flows from the first radial liquid path 116 along the first circumferential liquid path 115, the second circumferential liquid path 118 and the second radial liquid path 119 to the second axial liquid path 117. The cooling medium in the second axial liquid path 117 then flows through the second radial liquid path 119 to the second circumferential liquid path 118, and after passing through the second circumferential liquid path 118, enters the next first cooling unit 11a1, and thus circulates.

[0173] A radial liquid path 113 can be set at both ends of an axial liquid path 111, an axial liquid path 111 can be set between the two radial liquid paths 113, the circumferential liquid paths 112 are connected to each other, and the radial liquid path 113 and the circumferential liquid path 112 are set between the two axial liquid paths 111, thereby achieving the effect that the cooling medium can flow toward the two ends of the stator core 320 in an axial liquid path 111, or the cooling medium can be gathered from the two ends of the axial liquid path 111 to the middle of the axial liquid path 111.

[0174] Specifically, the first axial fluid path 114 defines opposite flow directions of the cooling medium based on the symmetry axis 140 a of the stator core 320 , and the second axial fluid path 117 defines relative flow directions of the cooling medium based on the symmetry axis 140 a of the stator core 320 .

[0175] It should be noted that if the cooling medium flows from the second cooling unit 11a2 to the first cooling unit 11a1, the above flow direction is opposite.

[0176] It is worth noting that the series coordination between the cooling units 11a with the same circumferential flow direction and the multi-directional flow coordination of the liquid path within a cooling unit 11a can be defined. The circumferential liquid path can be used to form a parallel branch f with each half of the adjacent axial liquid path. The radial liquid paths at both ends form two parallel branches, and the two parallel branches are combined into a parallel unit. The circumferential liquid path connects the parallel units in series to form a series-parallel cooling liquid path.

[0177] The multi-branch liquid path arrangement of the cooling unit 11a in the cooling liquid path can effectively shorten the overall liquid path length of the cooling structure 10, thereby making the cooling efficiency of the cooling medium higher.

[0178] For example, a portion of the circumferential liquid path 112 and the radial liquid path 113 can be connected to the middle position of the axial liquid path 111, and a portion of the axial liquid path 111 and the radial liquid path 113 can be connected to the two ends of the axial liquid path 111. The setting of the circumferential liquid path 112 and the radial liquid path 113 can also enable the cooling medium to flow along different circumferential positions of the stator core 320.

[0179] For example, refer to Figure 5 The cooling liquid path 110 can define two liquid paths. For example, the directions of the two liquid paths are F1 and F2 respectively. After reversing, the directions of the two liquid paths are F1' and F2'.

[0180] In some embodiments, the axial fluid path 111 passes through both ends of the stator core 320 .

[0181] In some embodiments, the cooling structure 10 is further provided with a liquid inlet channel 140 .

[0182] The liquid inlet channel 140 is configured to communicate with the diversion channel 130 , wherein the cooling medium flows along the liquid inlet channel 140 into the diversion channel 130 .

[0183] By providing the liquid inlet channel 140 in communication with the diverter channel 130 , two flow directions are achieved: the liquid inlet channel 140 - diverter channel 130 - cooling liquid path 110 and the liquid inlet channel 140 - diverter channel 130 - cooling liquid cavity 120 .

[0184] Exemplarily, the number of liquid inlet channels 140 can be one, or can be set to two or more. The specific number is set according to actual use. The liquid inlet channel 140 and the diversion channel 130 are adapted and connected one by one. By increasing the number of liquid inlet channels 140, the efficiency of the cooling medium entering the cooling liquid path 110 and the cooling liquid cavity 120 can be improved, and the length of the circumferential flow of the cooling liquid path 110 can be further shortened, thereby improving the cooling efficiency of the stator core 320 and the stator winding 350.

[0185] In some embodiments, reference Figure 11 The liquid inlet channel 140 defines two flow directions for the cooling medium to pass through, wherein the two flow directions are arranged in opposite directions based on the symmetry axis 140 a of the stator core 320 .

[0186] By setting up the liquid inlet channel 140, the liquid inlet channel 140 defines two flow directions for the cooling medium to pass through. The two flow directions are set in opposite directions based on the symmetry axis 140a of the stator core 320, so that the cooling medium flows along the liquid inlet channel 140 to the diversion channels 130 at both ends of the stator core 320. The cooling medium in the liquid inlet channel 140 has opposite flow directions, which can ensure that the temperature of the cooling medium flowing into each diversion channel 130 is roughly consistent.

[0187] In some embodiments, the cooling structure 10 is further provided with a first type of liquid outlet channel 150 and a liquid passing channel 160 .

[0188] The first type of liquid outlet channel 150 is configured to communicate with the cooling liquid cavity 120 , and the liquid passage 160 communicates the first type of liquid outlet channel 150 and the cooling liquid cavity 120 , wherein the cooling liquid cavity 120 communicates with the first type of liquid outlet channel 150 through the liquid passage 160 .

[0189] By providing the first type of liquid outlet channel 150 and the liquid flow channel 160 , the cooling medium in the cooling liquid cavity 120 can flow into the first type of liquid outlet channel 150 along the liquid flow channel 160 , thereby achieving the effect of discharging the cooling medium from the cooling liquid cavity 120 .

[0190] Exemplarily, two first-type liquid outlet channels 150 can be provided and independently provided from the stator core 320 . For example, the two first-type liquid outlet channels 150 can be located at both ends of the stator core 320 and connected to the cooling liquid cavity 120 through the liquid passage 160 .

[0191] In the working state, this setting method can keep the cooling medium in the cooling liquid chamber 120 in a state of continuous flow. Under the action of gravity, the cooling medium will preferentially flow into the first type of liquid outlet channel 150 along the liquid flow channel 160, so that there will not be much cooling medium left in the cooling liquid chamber 120, effectively preventing local discharge of the stator winding 350, and preventing excessive cooling medium from causing frictional resistance to the rotor's rotation. It can also avoid the problem of impurities contacting the stator winding 350 and causing damage to the stator winding 350, thereby improving the working efficiency and insulation life of the motor 1.

[0192] In some embodiments, the cooling structure 10 is further provided with a second type of liquid outlet channel 170 .

[0193] The second type of liquid outlet channel 170 is configured to communicate with the cooling liquid path 110 , wherein the cooling medium in the first type of liquid outlet channel 150 and the cooling medium in the second type of liquid outlet channel 170 flow independently.

[0194] By providing the second type of liquid outlet channel 170, the cooling medium in the cooling liquid path 110 can flow into the second type of liquid outlet channel 170. The second type of liquid outlet channel 170 is used to independently lead the cooling medium out of the cooling liquid path 110, without having to lead it into the cooling liquid cavity 120 and flow along the liquid passage 160 to the first type of liquid outlet channel 150. This can simplify the discharge method of the cooling medium, reduce the time it takes for the cooling medium to be discharged from the cooling liquid path 110 to a certain extent, and further improve the cooling efficiency.

[0195] It should be noted that the second type of liquid outlet channel 170 has the same structure as the liquid inlet channel 140 (ie, uses the same structure), and their functions are interchangeable. Figures 5 to 7 , when the end of liquid path A (i.e. Figure 5 C in the figure) as the liquid inlet end, and the liquid path B end (that is, Figure 5 D in the figure) is used as a port for liquid outlet, and at this time the second type liquid outlet channel 170 and the liquid inlet channel 140 serve as liquid outlet and liquid inlet respectively.

[0196] Of course, since the second type of liquid outlet channel 170 has the same structure as the liquid inlet channel 140, the second type of liquid outlet channel 170 and the liquid inlet channel 140 can also be interchanged, that is, when the liquid path A end (i.e. Figure 5 C in the figure) as a port for liquid outlet, and the end of the liquid path B (i.e. Figure 5 D in the figure) is the liquid inlet end, and the only difference between the two is liquid inlet or liquid outlet.

[0197] In some embodiments, the first type of liquid outlet channel 150 has a first type of liquid outlet for allowing the cooling medium to pass through, and the second type of liquid outlet channel 170 has a second type of liquid outlet for allowing the cooling medium to pass through, wherein the first type of liquid outlet and the second type of liquid outlet are located in different planes, and the second type of liquid outlet can be connected to the second cooling liquid outlet 110b so that the cooling medium can flow to the second cooling liquid outlet 110b after flowing out of the second type of liquid outlet channel 170 along the second type of liquid outlet.

[0198] By arranging the first type of liquid outlet and the second type of liquid outlet in different planes, the cooling medium can be discharged from the cooling liquid chamber 120 and the cooling liquid path 110 along the liquid outlets in different directions, thereby reducing the structural complexity of the bottom of the motor and avoiding the problem of excessive concentration of oil pressure due to excessive concentration of the directions of the liquid outlets, thereby reducing the stability of the stator assembly 30.

[0199] For example, the plane where the first type of liquid outlet is located can be arranged parallel to the radial surface of the stator core 320 and perpendicular to the ground, so that the cooling medium is discharged along the first type of liquid outlet under the action of gravity.

[0200] Furthermore, the plane where the second type of liquid outlet is located can be perpendicular or inclined to the radial surface of the stator core 320, so that the direction in which the cooling medium is discharged along the second type of liquid outlet can be perpendicular or inclined to the axial direction of the stator core 320.

[0201] The second type of liquid outlet is formed on the main body 520 of the housing 50 and is constituted as a through hole on the main body 520 of the housing 50 , while the first type of liquid outlet is independently provided on the main body 520 of the housing 50 from the stator core 320 .

[0202] In some embodiments, the first type of liquid outlet channel 150 and the second type of liquid outlet channel 170 are connected to the same external oil tank 400 through different pipes.

[0203] By connecting the first type of liquid outlet channel 150 and the second type of liquid outlet channel 170 to the same external oil tank 400 through different pipes, the cooling medium is collected, and the cooling medium is received by the same external oil tank 400, and the liquid inlet channel 140 is also connected to the external oil tank 400 through the heat exchanger 300 and the oil supply pump, thereby achieving a stable circulation flow of the cooling medium.

[0204] In some embodiments, reference Figure 1 The cooling structure 10 is further provided with a return oil chamber 180 , which is configured to communicate with the first type of liquid outlet channel 150 .

[0205] By providing a reflux oil chamber 180 in communication with the first-class liquid outlet channel 150 , the coolant in the cooling liquid chamber 120 can enter the reflux oil chamber 180 along the first-class liquid outlet channel 150 . One of the two first-class liquid outlet channels 150 at both ends of the stator core 320 is connected to the external oil tank 400 via a connecting pipe, and the other first liquid outlet channel is in communication with the first-class liquid outlet channel 150 via the reflux oil chamber 180 , so that the two first-class liquid outlet channels 150 share one of the first-class liquid outlet ports to discharge the coolant in the cooling liquid chamber 120 .

[0206] In some embodiments, reference Figure 1 The cooling liquid chamber 120 includes a liquid collecting chamber 121 and a liquid spraying chamber 122 , and the liquid collecting chamber 121 is connected between the diversion channel 130 and the liquid spraying chamber 122 ; the cooling structure 10 is further provided with: a liquid spraying channel 190 .

[0207] The liquid spray channel 190 connects the liquid collecting chamber 121 and the liquid spray chamber 122 , wherein the liquid spray channel 190 has a liquid spray outlet for allowing the cooling medium to pass through, and the diversion channel 130 has a diversion liquid outlet for allowing the cooling medium to pass through.

[0208] By setting the spray outlet of the spray channel 190, the cooling medium can be sprayed from the collecting chamber 121 into the spray chamber 122. The outlet of the second sub-channel 132 of the diversion channel 130 serves as the diversion liquid outlet. The cooling medium flowing through the diversion liquid outlet enters the collecting chamber 121 and is sprayed into the spray chamber 122 along the spray outlet at a certain pressure, while preventing the cooling medium from being retained in the rotor.

[0209] During this process, the liquid collecting chamber 121 will be filled with the cooling medium, which can further improve the cooling effect.

[0210] In some embodiments, the diversion channel 130 is used to introduce the cooling medium into the cooling liquid cavity 120 and the cooling liquid path 110, and the cooling medium in the cooling liquid cavity 120 and the cooling liquid path 110 flows out independently along the first type of liquid outlet channel 150 and the second type of liquid outlet channel 170 respectively.

[0211] According to the second aspect of this application, reference Figure 8 , a cooling system 20 is provided, comprising the cooling structure 10 as described above.

[0212] The cooling system 20 includes all the beneficial effects of the cooling structure 10 as described above, which will not be described in detail in this application.

[0213] In some embodiments, reference Figure 8 The cooling system 20 also includes: a reversing switch 200.

[0214] The reversing switch 200 is used to switch the flow direction of the cooling medium of the cooling structure 10 .

[0215] By providing the reversing switch 200 , the flow direction of the cooling medium of the cooling structure 10 can be changed, and the liquid can be continuously fed into the cooling medium at different positions, thereby coordinating the overall cooling effect of the cooling structure 10 .

[0216] Exemplarily, the reversing switch 200 may be configured as a reversing valve.

[0217] In some embodiments, reference Figure 8 , the cooling system 20 further includes:

[0218] The heat exchanger 300 is used to exchange heat with the cooling medium to adjust the temperature of the cooling medium.

[0219] By providing the heat exchanger 300 , the temperature of the cooling medium can be adjusted, thereby improving the cooling efficiency of the system.

[0220] Exemplarily, the heat exchanger may be a heat exchange plate or a condenser, whichever is capable of reducing the temperature of the cooling medium.

[0221] According to a third aspect of the present application, a stator assembly 30 is provided, comprising the cooling structure 10 as described above.

[0222] The stator assembly 30 includes all the beneficial effects of the cooling structure 10 as described above, which will not be described in detail in this application.

[0223] In some embodiments, reference Figure 1 、 Figure 2 、 Figures 9 to 13 The stator assembly 30 includes a stator core 320 and a shunt 330 .

[0224] The stator core 320 is located in the inner space 50 a of the housing. The diverter 330 is located in the inner space 50 a and is connected to the stator core 320 .

[0225] The shunt channel 130 of the cooling structure 10 is at least formed between the shunt member 330 and the stator core 320 , and the cooling liquid cavity 120 is at least formed between the housing 50 and the shunt member 330 .

[0226] The stator core 320 and the diverter 330 of the stator assembly 30 are both located in the shell space 50a of the shell 50, and the diverter 330 is connected to the stator core 320. The diverter 330 and the stator core 320 form a diverter channel 130, and the cooling liquid cavity 120 is formed at least between the shell 50 and the diverter 330. The diverter channel 130 is used to divert the cooling medium into the cooling liquid path 110 and the cooling liquid cavity 120, so as to cool the stator core 320 and the stator winding 350 of the stator assembly 30. The cooling effect is good, and the structure of the stator assembly 30 is simpler and more compact, and it is easy to assemble.

[0227] In the present application, a first opening and a second opening can be set on the circumference of the shell 50, wherein one of the first opening and the second opening can be connected to the cooling liquid path 110 through the liquid inlet channel 140, and the other can be connected to the cooling liquid path 110 through the second type of liquid outlet channel 170.

[0228] In actual use, the first opening and the second opening can be interchanged in position and function, with one opening serving as a liquid inlet and the other serving as a liquid outlet, and there is no structural difference between the two.

[0229] It is worth noting that after the functions of the two openings for liquid inlet and outlet are interchanged, the direction of the cooling medium in the cooling liquid path of the cooling structure flowing circumferentially will also be interchanged, thereby avoiding the uneven temperature of the stator assembly 30 due to a single flow direction.

[0230] An axial groove can be opened on the circumferential surface of the stator core 320 along the axial direction of the stator core 320. The axial groove is connected to the two openings on the shell. The axial grooves at the corresponding positions are used as part of the liquid inlet channel 140 and the second type of liquid outlet channel 170 respectively. The molding is easy, and the number of axial grooves is adapted to the number of openings.

[0231] In some embodiments, reference Figure 9 and Figure 10 The shunt member 330 is disposed at both axial ends of the stator core 320 , wherein the shunt member 330 includes a main body 331 and a recess 332 .

[0232] The body 331 is connected to the stator core 320 , and the recess 332 is formed on the body 331 , wherein the first sub-channel 131 of the shunt channel 130 is formed between the recess 332 and the end surface of the stator core 320 and the inner wall surface of the housing 50 .

[0233] By providing a recess 332 on the main body 331 of the diverter 330 , the first sub-channel 131 of the diverter channel 130 can be formed between the recess 332 and the end surface of the stator core 320 . The first sub-channel 131 is simple to form and easy to form.

[0234] For example, the number of the recesses 332 can be set to two, and the two recesses 332 are symmetrically distributed on the diverter 330 , wherein the two recesses 332 respectively form a diverter channel 130 with the end surface of the stator core 320 .

[0235] In actual use, for example, the end of the liquid path A (i.e. Figure 5 The first liquid port at C in the figure is used as the liquid inlet, and the end of the liquid path B (i.e. Figure 5 The second liquid port at D in the figure is used as the liquid outlet, and the cooling medium flows along the liquid path A end (i.e. Figure 5 The first liquid inlet (at point C in the figure) enters the liquid inlet channel 140 and then enters the two branch channels 130 at both ends of the stator core 320, and enters the cooling liquid path 110 along the second sub-channel 132 of the branch channel 130. After flowing along the circumference of the stator core 320, the cooling medium enters the liquid path B end (i.e. Figure 5 D in the middle) in the other two branch channels 130, and then the two oils of the circumferentially flowing cooling liquid path 110 are gathered into the second type of liquid outlet channel 170, and the cooling medium is discharged from the second liquid port.

[0236] This arrangement allows the liquid inlet channel 140 and the second type of liquid outlet channel 170 to be switched for use, and the flow direction of the cooling medium is changed by the reversing switch 200 to avoid temperature imbalance of the stator assembly 30 .

[0237] In some embodiments, the second sub-channel 132 passes through both ends of the diverter 330 along the axial direction of the diverter 330 .

[0238] By providing the second sub-channel 132 , the pressure of the cooling medium introduced into the cooling liquid chamber 120 can be adjusted.

[0239] Exemplarily, the second sub-channel 132 can be constructed as a through hole formed on the main body 331 of the diverter 330. The position of the through hole needs to be adapted to the recess 332 opened on the main body 331 of the diverter 330, effectively reducing the path of the cooling medium flowing from the liquid inlet channel 140 to the second sub-channel 132, thereby improving the cooling efficiency.

[0240] The number of through holes can be set to two or three, and the cross-sectional area of the through holes can also be adjusted accordingly according to actual use.

[0241] In the present application, the through hole capable of diverting the cooling medium to the cooling liquid chamber 120 is defined as a first pressure regulating hole, and the other through hole is defined as a second pressure regulating hole.

[0242] In some embodiments, the diverter 330 is provided with a closing portion 333 .

[0243] The closing portion 333 is adapted to close both ends of the other cooling units 11a of the cooling unit 11a connected to the first sub-channel 131, wherein the circumferential liquid path 112 is formed in the diverter 330 and the stator core 320, and the radial liquid path 113 is arranged on the diverter and on the radial surface in the middle of the stator core 320.

[0244] The setting of the closing portion 333 enables the cooling medium to flow into each cooling liquid path 110 only through the first sub-channel 131 of the diversion channel 130, so that the cooling medium enters each cooling unit 11a of the first cooling liquid path 110 through the first sub-channel 131, flows along the circumference of the stator core 320 to the second type of liquid outlet channel 170, and flows back to the oil tank 400.

[0245] For example, the diverter 330 is arranged in an annular shape, and the closing portion 333 of the diverter 330 can be constructed on diverter disc teeth arranged in sequence along the circumference of the diverter 330, and the diverter disc teeth can be adapted and plugged with the stator teeth of the stator core 320.

[0246] In some embodiments, the housing 50 is formed with a first opening 50 b and a second opening.

[0247] The first opening 50b is used to form one of the first coolant passage 110a and the second coolant passage 110b, and the second opening is used to form the other one of the first coolant passage 110a and the second coolant passage 110b. The first opening 50b and the second opening have the same structure.

[0248] By forming a first opening 50b and a second opening on the shell 50, the first opening 50b is used to form one of the first coolant passage 110a and the second coolant passage 110b, and the second opening is used to form the other of the first coolant passage 110a and the second coolant passage 110b; wherein, the first opening 50b and the second opening have the same structure, thereby achieving an effect of interchangeable functions of the first opening 50b and the second opening, one opening can allow the cooling medium to flow out of the cooling liquid passage 110, and the other opening can allow the cooling medium to flow into the cooling liquid passage 110.

[0249] In the present application, the first opening and the second opening are both circular holes opened on the shell, and are connected to the liquid inlet channel 140 and the second type of liquid outlet channel 170 of the corresponding cooling liquid circuit 110 respectively.

[0250] It should be noted that when the first opening 50b serves to introduce the cooling medium into the cooling liquid circuit 110, the channel adapted to the first opening 50b is the liquid inlet channel 140. At this time, the second opening serves to allow the cooling medium to flow out of the cooling liquid circuit. At this time, the channel adapted to the second opening is the second type of liquid outlet channel 170. Conversely, the channel adapted to the first opening 50b is the second type of liquid outlet channel 170, and the channel adapted to the second opening is the liquid inlet channel 140.

[0251] Specifically, in both cases, the flow directions of the cooling medium in the branches of the stator core 320 are also set in opposite directions.

[0252] In some embodiments, the stator assembly 30 further includes a liquid spraying member 340 .

[0253] The liquid spraying member 340 is located in the inner shell space 50 a and is sealed to the shell 50 . The liquid spraying member 340 is used to separate the cooling liquid chamber 120 into a liquid collecting chamber 121 and a liquid spraying chamber 122 .

[0254] In which, the spray channel 190 of the cooling structure 10 is arranged on the circumference of the spray part 340, and the spray part 340 is suitable for applying a force to the diverter part 330 so that the diverter part 330 has a tendency to approach the stator core 320, thereby enabling the diverter part 330 to fit with the spray part 340.

[0255] By providing a liquid spraying member 340, the cooling liquid chamber 120 is divided into a liquid collecting chamber 121 and a liquid spraying chamber 122 by using the liquid spraying member 340, and a liquid spraying channel 190 is formed on the liquid spraying member 340. The liquid spraying channel 190 is opened in the circumferential direction of the liquid spraying member 340, so that the cooling medium introduced into the cooling liquid chamber 120 can be sprayed to the end of the stator winding 350 with a certain pressure.

[0256] Furthermore, the liquid spraying member 340 is sealed to the housing 50 to ensure the overall sealing of the stator assembly 30 and prevent leakage of the cooling medium.

[0257] For example, the liquid spraying member 340 is annular. After the annular liquid spraying member 340 is assembled with the shell 50, part of the stator winding 350 also extends into the space of the annular liquid spraying member 340, so that the cooling medium can be accurately sprayed to the end of the stator winding 350. The liquid spraying channel 190 can be constructed as a liquid spraying hole on the liquid spraying member 340, and the number of the liquid spraying holes is set to be multiple.

[0258] refer to Figure 15 A sealing ring groove can be set on the outer ring of the liquid spraying part 340 for placing the sealing ring, and the other part of the sealing ring is pressed against the inner wall surface of the shell 50 to complete the sealing between the liquid spraying part 340 and the shell 50.

[0259] For example, a boss may be provided on the outer circumference of the liquid spraying member 340 , and a sealing ring groove may be provided on the boss.

[0260] At the same time, the end of the liquid spraying member 340 away from the stator core 320 is pressed against the housing 50 , thereby further improving the sealing effect between the liquid spraying member 340 and the housing 50 .

[0261] The liquid spraying member 340 further has a liquid passage 160 , which is used to connect the first type of liquid outlet channel 150 and the cooling liquid chamber 120 .

[0262] For example, the liquid passage 160 may be an oil leakage hole provided in the liquid spraying member 340 , which enables the first type of liquid outlet channel 150 to communicate with the cooling liquid cavity 120 .

[0263] In some embodiments, after the stator core 320 is connected to the housing 50, there is a gap between the outer wall of a portion of the stator core 320 and the inner wall of the housing 50. The gap, that is, the axial groove forms the liquid inlet channel 140, and the other parts of the stator core 320 are crimped to the inner wall of the housing 50. The crimping means direct surface-to-surface contact.

[0264] Exemplarily, the housing 50 includes an end cover 510 and a body 331, wherein bearings are respectively installed in the end cover 510 and the body 331, the outer ring of the bearing is interference fitted with the housing 50, and the rotor core 410, the rotor bracket and the rotating shaft are fixedly connected to form a rotor assembly 40, which transmits speed and torque. The rotor assembly 40 is supported by bearings and is not limited to the structure shown in the figure.

[0265] The main body 331 of the shell 50 of the present application is interference fitted with the stator core 320, and the axial displacement is limited by the stepped hole. The stator winding 350 (molded or loose-embedded winding) is inserted into the stator core 320, and the rotor core 410 can be added with permanent magnets or wound excitation windings. The stator winding 350 is energized to form a rotating air gap magnetic field, driving the rotor assembly 40 to rotate and output torque. The shell 50 composed of the end cover 510 and the main body 331 is axially interference fitted with a spray part 340 at both ends. The two ends of the stator core 320 are tightly attached to the diverter part 330 and are pressed by the spray part 340. The spray part 340 and the diverter part 330 can be formed into one piece and serve as the main seal in the cooling system 20.

[0266] The liquid spraying part 340, the diverter part 330 and the sealing ring of the present application are sealing parts, which are combined with the end cover 510, the main body 331 and the stator core 320 to form a cooling liquid chamber 120. The cooling liquid chamber 120 includes a liquid collecting chamber 121 and a liquid spraying chamber 122. A cooling liquid path 110 is provided inside the stator core 320.

[0267] In the working state, the liquid collecting chamber 121 and the cooling liquid path 110 are filled with the cooling medium, and the cooling medium and air ejected from the liquid collecting chamber 121 are stored in the liquid spraying chamber 122. The cooling medium enters or flows out of the shell 50 through the first opening on the shell 50, flows out or flows into the shell from the second opening, and after entering the shell 50, it is diverted to the first recess 332 of the outer edge of the diverter 330 at both ends through the liquid inlet channel 140 on the cylindrical surface of the stator core 320. The first recess 332 has a second sub-channel 132 connected to the liquid collecting chamber 121. These structures can be called the liquid path A end (that is, Figure 2 A in the figure);

[0268] Figure 5 In the stator core 320, there is a liquid path B end with the same structure (i.e. Figure 2 Its function is to collect the cooling medium of the two branches and serve as the second type of liquid outlet channel 170.

[0269] The cooling medium in the first recess 332 can flow radially into the internal cooling liquid path 110 or enter the liquid collecting chamber 121 through the second sub-channel 132. The cooling medium in the liquid collecting chamber 121 is sprayed into the liquid spray chamber 122 through the spray hole of the spray part 340 to cool the end of the stator winding 350.

[0270] The cooling medium entering the liquid spray chamber 122 is collected at the bottom of the housing 50 along the liquid passage 160 .

[0271] Specifically, the cooling medium in the spray chamber 122 leaks out through the liquid passages 160 on both sides and enters the end cover end face cavity of the end cover 510 and the box end face cavity of the main body 520 (i.e., the first type of liquid outlet channel 150). The end cover end face cavity and the box end face cavity form a return oil chamber 180 and return to the return oil tank 400 (e.g., Figure 7 shown).

[0272] In the cooling system 20 of the present application, the cavity structure after the cooling liquid path 110 is filled with the cooling medium is as follows: Figure 1 and Figure 5 As shown, the first cooling liquid port 110a and the second cooling liquid port 110b are symmetrically distributed on the cylindrical wall of the main body 520 in a circumferential direction, one is used to input the cooling medium, and the other is used to output the cooling medium, and they are interchangeable. The first cooling liquid port 110a is connected to the liquid inlet channel 140 and the diversion channel 130, and the second cooling liquid port 110b is connected to the second type of liquid outlet channel 170 at the end of the liquid path B.

[0273] The circumferential liquid path 112 of one cooling unit 11 a in the same branch is communicated with the circumferential liquid path 112 of another adjacent cooling unit 11 a .

[0274] The cooling medium enters the cooling liquid path 110 of the stator core 320 from end A or end B of the liquid path and flows from the first cooling liquid path junction 110a along two branches to the second cooling liquid path junction 110b. The circumferential liquid path 112 connects the axial liquid paths 111 of the two cooling units 11a at both ends of the stator core 320, and the circumferential liquid path 112 connects the axial liquid paths 111 of the two cooling units 11a at the middle position of the stator core 320. The connection form is (…first circumferential liquid path 115-first radial liquid path 116-first axial liquid path 114-first radial liquid path 116-first circumferential liquid path 115-second circumferential liquid path 118-second radial liquid path 119-second axial liquid path 117-second radial liquid path 119-second circumferential liquid path 118-…). The liquid path is simplified as follows: Figure 8 shown.

[0275] After the cooling medium enters the motor 1 through the first cooling liquid port 110a, it circulates Figure 5 、 Figure 8 The internal cooling liquid path 110 shown mainly absorbs the heat generated in the middle of the stator winding 350 in the cooling liquid path 110. It is closer to the heat-generating stator winding 350 in the cooling liquid path 110, and can absorb the heat generated by the winding in time and cool it.

[0276] like Figure 8As shown, a series liquid circuit g formed by a plurality of cooling units 11a connected in series and a parallel liquid circuit f formed by the radial liquid circuit, circumferential liquid circuit and axial liquid circuit in the cooling unit 11a in parallel form a liquid circuit of a series-parallel structure. The multi-branch liquid circuit design can effectively shorten the overall liquid circuit length, which can make the cooling efficiency of the cooling medium better. The cooling medium can enter and fill the liquid collecting cavity 121 through the second sub-channel 132. The pressure in the cavity is determined by the aperture of the second sub-channel 132. The cooling medium in the cavity is radially ejected through the spray outlet, and the ejection flow rate is determined by the aperture of the spray outlet. Reasonable design of the aperture of the second sub-channel 132 and the spray outlet can achieve more efficient liquid spray cooling of the winding end and reduce the friction loss of the rotor caused by the oil.

[0277] The three oil chambers—the liquid collecting chamber 121, the liquid spraying chamber 122, and the cooling liquid path 110—need to be tightly sealed to prevent leakage and increase internal pressure. The tooth ends have protruding slot boots that engage with the recessed slot boots of the stator teeth, enclosing the slot wedges and stator winding 350 within the stator slots. The ends of the stator winding 350 extend through the slots of the diverter 330. Within the housing, the liquid spraying member 340 is pressed against the end of the stator core 320 by a gasket. The diverter 330 and stator core 320 can also be connected by bolts, adhesive, or other methods to prevent leakage of the coolant in the cooling liquid path 110. The outer circumference of the liquid spraying member 340 has a sealing ring groove for mounting a sealing ring. On the other side of the liquid spraying member 340, a protruding ring at the end of the liquid spraying ring engages with the recessed ring of the diverter 330 to seal and prevent coolant from escaping the liquid collecting chamber 121. In order to achieve stricter sealing of the cooling medium flow path, the end face of the spray part 340 can be bolted or bonded to the shell 50 or the end cover 510, and the joints of the spray part 340, the diverter part 330 and the stator core 320 can be bonded with sealant. The spray part 340 and the diverter part 330 can also be formed into one piece.

[0278] like Figure 8 As shown, the motor 1 cooling system 20 proposed in the present application also includes an oil supply system for the cooling medium, including an oil pump, a return oil tank 400, a heat exchanger 300 and a reversing valve 210. When the reversing valve is in the right position, the first coolant port 110a is the liquid inlet, and the second coolant port 110b is the liquid outlet; when it is in the left position, the first coolant port 110a is the liquid outlet, and the second coolant port 110b is the liquid inlet; when the reversing valve 210 is in the middle position, the cooling medium stagnates after inertial flow, and is now in an intermediate state of flow direction change. The cooling medium starts to circulate from the liquid outlet and the return oil tank 400 determined by the reversing valve, and after being pressurized by the oil pump and cooled by the cooler, it returns to the reversing valve 210 and enters the liquid inlet of the motor 1 determined by the reversing valve. After the cooling is completed inside the motor 1, the cooling medium returns to the liquid outlet or passes through Figure 8The bottom structure of the cavity of housing 50 shown here flows back to oil tank 400, completing a cooling cycle. When the reversing valve is in the neutral position, the coolant in housing 50 cannot flow in or out. At this time, the coolant cannot circulate and does not pass through the cooler, with almost no cooling effect. When the reversing valve is in the left or right position, the coolant continuously flows into and out of motor 1, circulating continuously, thereby exerting a cooling effect and maintaining a stable stator temperature of motor 1.

[0279] When the reversing valve selects the first coolant path 110a as the liquid inlet, the oil flow direction of the liquid path is fixed. After flowing through the liquid path, the temperature of the cooling medium increases, resulting in a larger temperature difference between the cooling medium and the stator core 320 near the liquid path A end, and a smaller temperature difference near the liquid path B end, resulting in a better cooling effect near the liquid path A end than at the liquid path B end. When the second coolant path 110b is continuously used as the liquid inlet, the temperature difference between the cooling medium and the stator core 320 at the liquid path B end is larger, resulting in a better cooling effect at this end. The present application adds a reversing valve to the cooling system 20 to adjust the flow direction of the internal cooling liquid path 110, which can coordinate the cooling effect at both ends of the liquid path. The cooling system 20 of the motor 1 is set to a certain cycle, so that the reversing valve is continuously in the right position in the first half of the cycle, and then the reversing valve changes position for a short period of time and is continuously in the right position in the second half of the cycle. The inlet and outlet ports are continuously replaced in the cycle to change the flow direction of the internal cooling liquid path 110. The system relies on the reversing valve to coordinate the distribution of the cooling effect, so that the cooling of each part of the motor is balanced. At the same time, combined with the oil flow through the teeth and the end spraying, efficient and balanced cooling of the motor 1 is achieved.

[0280] In some other embodiments, reference Figure 16 , adding a liquid path G end for liquid inlet or outlet (i.e. Figure 16 G in the middle) and the end of the liquid path F (i.e. Figure 16 At this time, the cooling medium flows in the circumferential direction of the cooling liquid path 110 as shown in FIG. Figure 16 In the first half of the liquid circuit reversing cycle, the cooling medium enters the liquid circuit G and flows into the liquid circuit A and liquid circuit B in two ways; at the same time, the cooling medium also flows into the liquid circuit F (i.e. Figure 16 The liquid enters at point F in the figure and flows to the liquid path A and the liquid path B. In the second half of the cycle after the reversing valve is reversed, the cooling medium flows in the opposite direction, such as Figure 8 As shown by the dashed lines, liquid inlet ends A and B are used for liquid flow, while liquid outlet ends G and F are used for liquid flow. Adding more ports for liquid inlet and outlet can further shorten the coolant's circulation path within motor 1. The coolant temperature is lowest at the liquid inlet, and shortening the liquid path brings the cooling target closer to the liquid inlet. This increased temperature differential and faster liquid circulation improve the overall cooling efficiency of cooling system 20. Motors 1 with larger radial dimensions can increase the number of ports to 8 or 10, further enhancing system cooling efficiency.

[0281] Figure 5 and Figure 16 The comparison is changed from one inlet and one outlet to two inlets and two outlets, and the flow direction is changed to four flow directions. The above-mentioned multi-liquid path port design further shortens the liquid path length and improves the cooling efficiency of the motor 1.

[0282] In the present application, stator slots and stator teeth are distributed in an array in the inner circumferential direction of the stator core 320 , and a cooling liquid path 110 is opened on each stator tooth. The liquid path is relatively narrow and long in the radial direction, which reduces the impact on the electromagnetic performance of the motor 1 .

[0283] The stator core 320 is divided into three sections, including a middle core section in the middle and a main body 520 core section with the same shape at both ends. The silicon steel sheets of the two core sections are as follows: Figure 11 As shown, the middle portion of the central core segment includes a circumferential fluid path 112, connecting the cooling fluid paths 110 of the two stator teeth. The circumferential fluid paths 112 are spaced apart in the circumferential direction. The first and second axial grooves are axial grooves on the cylindrical surface of the stator core 320, which respectively introduce or remove cooling fluid from the first opening (first cooling oil path port) and the second opening (second cooling oil path port) of the housing 50. One of the two axial grooves is for fluid inlet, and the other is for fluid outlet, and they are interchangeable.

[0284] The stator core 320 of the present application has fewer segments, which does not affect the paint dipping process of the stator winding 350.

[0285] refer to Figure 17 and Figure 18 The diverter 330 of the present application can adopt an assembled structure for easy installation.

[0286] According to a fourth aspect of the present application, a motor 1 is provided, comprising the cooling structure 10 as described above or the stator assembly 30 as described above.

[0287] The motor 1 has all the beneficial effects of the cooling structure 10 or the stator assembly 30 described above, which will not be described in detail here.

[0288] The motor 1 includes an electric motor and a generator.

[0289] The motor 1 further includes a housing 50 having an inner housing space 50 a . The stator core 320 , the stator winding, the liquid spraying member 340 , and the flow diverter 330 are all located in the inner housing space 50 a .

[0290] According to a fifth aspect of the present application, an actuator is provided, comprising a first component and a second component, one of the first component and the second component rotates relative to each other around the axial direction of the actuator, one of the first component and the second component comprises the stator component 30 as described above, and the other of the first component and the second component comprises a rotor component 40.

[0291] The actuator has all the beneficial effects of the stator assembly 30 described above, which will not be described in detail here.

[0292] According to the sixth aspect of this application, referring to Figure 22 , a vehicle H is provided, comprising the cooling structure 10 as described above, or the cooling system 20 as described above, or the stator assembly 30 as described above.

[0293] The vehicle H has all the beneficial effects of the cooling structure 10 , the cooling system 20 , or the stator assembly 30 , which will not be described in detail here.

[0294] The vehicle H may be a fuel vehicle, a plug-in hybrid vehicle, a new energy vehicle, etc., and this application does not make any specific limitation on this.

[0295] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0296] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0297] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0298] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A cooling structure, characterized in that: The cooling structure comprises: A cooling liquid path is formed in the stator core; A cooling liquid chamber is provided independently of the stator core; and A shunt channel for allowing a cooling medium to flow through the cooling liquid path and the cooling liquid cavity; Wherein, the diversion channel is connected to the cooling liquid path and the cooling liquid cavity respectively.

2. The cooling structure according to claim 1, characterized in that: The diversion channel comprises: a first sub-channel, configured to communicate with the cooling liquid path; a second sub-channel, configured to communicate with the cooling liquid cavity; The first sub-channel is connected to the second sub-channel, and the pressure of the working fluid flowing through the first sub-channel is different from the pressure of the working fluid flowing through the second sub-channel.

3. The cooling structure according to claim 2, characterized in that: The cooling liquid circuit includes at least two cooling units, and the cooling units are distributed along the circumference of the stator core; The cooling medium can flow into the cooling unit along the first sub-flow channel.

4. The cooling structure according to claim 1, characterized in that: The cooling liquid circuit includes: a first cooling liquid passage, for supplying cooling medium to the cooling liquid passage; a second coolant passage, for allowing the cooling medium to flow out of the coolant passage; The first coolant port has two branches respectively connected to the second coolant port, so that the cooling medium flows along the two branches to the second coolant port respectively.

5. The cooling structure according to claim 4, characterized in that: The circumferential arc between the first coolant passage and the second coolant passage is 90° or 180°.

6. The cooling structure according to claim 3, characterized in that: The cooling unit comprises: An axial fluid path defines an axial flow direction for the cooling medium to flow along the axial direction of the stator core; a radial fluid path defining a radial flow direction for causing the cooling medium to flow radially along the stator core; and a circumferential fluid path defining a circumferential flow direction for causing the cooling medium to flow along the circumference of the stator core; The radial fluid path is located between the axial fluid path and the circumferential fluid path, and the axial fluid path is connected to the circumferential fluid path through the radial fluid path.

7. The cooling structure according to claim 4, characterized in that: The circumferential liquid path of one of the cooling units in the same branch is communicated with the circumferential liquid path of another adjacent cooling unit.

8. The cooling structure according to claim 5, characterized in that: The axial flow direction defined by the axial fluid path has two opposite directions or two relative directions.

9. The cooling structure according to claim 5, characterized in that: The axial fluid path passes through both ends of the stator core.

10. The cooling structure according to any one of claims 4 to 9, characterized in that: Also features: a liquid inlet channel, configured to communicate with the diversion channel; The cooling medium flows along the liquid inlet channel into the diversion channel.

11. The cooling structure according to claim 10, characterized in that: The liquid inlet channel defines two flow directions for the cooling medium to pass through; The two flow directions are arranged opposite to each other based on the symmetry axis of the stator core.

12. The cooling structure according to claim 10, characterized in that: Also features: A first type of liquid outlet channel is configured to communicate with the cooling liquid cavity; a liquid passage connecting the first type of liquid outlet passage and the cooling liquid cavity; Wherein, the cooling liquid cavity is connected with the first type of liquid outlet channel through the liquid passage.

13. The cooling structure according to claim 12, characterized in that: Also features: a second type of liquid outlet channel, configured to communicate with the cooling liquid path; The cooling medium in the first type of liquid outlet channel and the cooling medium in the second type of liquid outlet channel flow independently.

14. The cooling structure according to claim 13, characterized in that: The first type of liquid outlet channel has a first type of liquid outlet for the cooling medium to pass through, and the second type of liquid outlet channel has a second type of liquid outlet for the cooling medium to flow out of the second type of liquid outlet channel; The first type of liquid outlet and the second type of liquid outlet are located in different planes, and the second type of liquid outlet is connected to the second coolant passage.

15. The cooling structure according to claim 13, characterized in that: The first type of liquid outlet channel and the second type of liquid outlet channel are connected to the same external oil tank through different pipelines.

16. The cooling structure according to claim 12, characterized in that: The cooling structure further comprises: The return oil chamber is configured to communicate with the first type of liquid outlet channel.

17. The cooling structure according to claim 1, characterized in that The cooling liquid chamber includes a liquid collecting chamber and a liquid spraying chamber, and the liquid collecting chamber is connected between the diversion channel and the liquid spraying chamber; The cooling structure further comprises: a liquid spraying channel, configured to communicate with the liquid collecting chamber and the liquid spraying chamber; Wherein, the liquid spray channel has a liquid spray outlet for allowing the cooling medium to pass through, and the diversion channel has a diversion liquid port for allowing the cooling medium to pass through; The cooling medium can flow from the diversion liquid outlet to the liquid spray outlet.

18. A cooling system, characterized in that: The cooling structure comprises the cooling structure according to any one of claims 1 to 17.

19. The cooling system according to claim 18, wherein: The cooling system further comprises: A reversing switch is used to switch the flow direction of the cooling medium of the cooling structure.

20. The cooling system according to claim 18, wherein The cooling system further comprises: The heat exchanger is used to exchange heat with the cooling medium to adjust the temperature of the cooling medium.

21. A stator assembly, characterized in that: The cooling structure comprises the cooling structure according to any one of claims 1 to 17.

22. The stator assembly according to claim 21, wherein: The stator assembly comprises: a stator core, used to form the cooling liquid path; A shunt member connected to the stator core; Wherein, the shunt channel of the cooling structure is formed at least between the shunt member and the stator core; and The cooling liquid chamber is formed at least between the shell and the diverter.

23. The stator assembly according to claim 22, wherein: The shunt member is arranged at both axial ends of the stator core; Wherein, the diverter comprises: A body connected to the stator core; a recessed portion, provided on the body; Wherein, a first sub-flow channel of the shunt channel is formed between the recess and the end surface of the stator core.

24. The stator assembly according to claim 22, wherein: The second sub-channel of the diverter channel passes through both ends of the diverter along the axial direction of the diverter.

25. The stator assembly according to claim 23, wherein: The diverter is provided with: a closing portion adapted to close both ends of the other cooling liquid paths connected to the first sub-channel; Wherein, the circumferential liquid path of the cooling liquid path is formed in the diverter and / or the stator core.

26. The stator assembly according to claim 22, wherein: The housing is formed with: a first opening for forming one of the first coolant passage and the second coolant passage, a second opening for forming the other of the first coolant passage and the second coolant passage; The first opening and the second opening have the same structure.

27. The stator assembly according to claim 22, wherein: Also includes: a liquid spraying member located in the inner space of the shell and sealedly connected to the shell, the liquid spraying member being used to separate the cooling liquid chamber into a liquid collecting chamber and a liquid spraying chamber; The liquid spraying channel of the cooling structure is arranged on the circumference of the liquid spraying member, and the liquid spraying member is suitable for applying a force to the diverter member so that the diverter member tends to approach the stator core, so that the diverter member fits the liquid spraying member.

28. A motor, characterized in that: The cooling structure comprises the cooling structure according to any one of claims 1 to 17 or the stator assembly according to any one of claims 21 to 27.

29. An actuator, characterized in that: The actuator comprises a first component and a second component, wherein the first component and the second component rotate relative to each other around the axial direction of the actuator, one of the first component and the second component comprises the stator component according to any one of claims 21 to 26, and the other of the first component and the second component comprises a rotor component.

30. A vehicle, characterized in that: The cooling device comprises a cooling structure according to any one of claims 1 to 17, a cooling system according to any one of claims 18 to 20, a stator assembly according to any one of claims 21 to 27, a motor according to claim 28, or an actuator according to claim 29.

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