CN118367695B

CN118367695B - Stator cooling structure, stator assembly and motor

Info

Publication number: CN118367695B
Application number: CN202410781376.4A
Authority: CN
Inventors: 张勐; 张芳; 周祖豪; 郭志鹏
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2024-06-18
Filing date: 2024-06-18
Publication date: 2024-08-20
Anticipated expiration: 2044-06-18
Also published as: CN118367695A

Abstract

The invention provides a stator cooling structure, a stator assembly and a motor, relates to the technical field of motors, and solves the technical problems that a stator is difficult to mount and disassemble, the stator is serious in heat generation and insufficient in internal heat dissipation and cooling. The stator cooling structure comprises a cooling sleeve sleeved outside the stator; the cooling sleeve is of a split structure and is formed by splicing a plurality of cooling blocks end to end; the splicing side of each cooling block is provided with an outer flow channel half groove, and the outer flow channel half grooves on two adjacent cooling blocks are spliced together to form an outer cooling flow channel; an inner cooling runner is arranged in the stator inner ring; the connecting cooling flow channels are arranged at two ends of the stator and are respectively communicated with the inner cooling flow channel and the outer cooling flow channel; the inner cooling flow passage diameter is smaller than the outer cooling flow passage diameter. The invention adopts a block aluminum sleeve structure to facilitate the installation and disassembly of the stator of the whole machine, each aluminum sleeve is provided with a vent and an outer cooling flow passage, and an inner cooling flow passage is arranged in the inner ring of the stator, so that the whole motor stator can be effectively cooled.

Description

Stator cooling structure, stator assembly and motor

Technical Field

The invention relates to the technical field of motors, in particular to a stator cooling structure based on a segmented aluminum sleeve, a stator assembly and a motor.

Background

The motor is affected by various losses in the running process, and the heating problem is always a key and difficult problem in the design and research and development process. The higher the stator temperature, the greater the losses at the same current, the lower the electromagnetic performance, and even the inability to operate for long periods of time. In the prior art, heat dissipation is generally carried out on the stator by adopting a heat pipe embedded in the winding, or the stator is directly cooled by opening holes on the tooth yoke part of the stator, or the stator and the winding are directly cooled by transmission heat dissipation through a shell containing a water cooling runner, or the stator and the winding are directly ventilated and cooled in the shell. The cooling structures have the problems of complex manufacturing process, high cost or insufficient cooling effect.

As shown in fig. 1, a cooling device for the stator winding end of an electric motor is known from the prior art, wherein a cooling line is led out by means of a housing water channel and flows out from the outlet of the end cap via the stator winding end. The mode can enhance the cooling effect of the stator to a certain extent, but is also very limited, on one hand, the manufacturing cost of the shell is high, and the processing technology is complex; on the other hand, the cooling effect on the motor stator, especially the middle winding of the motor, is poor, so that the local temperature of the stator winding is higher, the temperature difference gradient is larger, and the whole temperature control performance of the motor and the service life of the motor are influenced; moreover, the shell outside the stator is of an integral structure, and the shell and the stator are connected in an interference fit manner during installation, so that the whole cylindrical shell is extremely difficult to disassemble due to the interference effect, and the smooth disassembly is performed at a higher temperature, but in order to ensure the insulation performance, the operation cannot be performed at a high temperature, and therefore the disassembly and the assembly of the shell in the prior art are difficult.

Disclosure of Invention

The invention aims to provide a stator cooling structure based on a segmented aluminum sleeve, a stator assembly and a motor, so as to solve the technical problems of difficult stator installation and disassembly, severe stator heating and insufficient internal heat dissipation and cooling in the prior art.

In order to achieve the above purpose, the present invention provides the following technical solutions:

The invention provides a stator cooling structure, which comprises a cooling sleeve sleeved outside a stator; the cooling sleeve is of a split structure and is formed by splicing a plurality of cooling blocks end to end; the splicing side of each cooling block is provided with an outer flow passage half groove, and the outer flow passage half grooves on two adjacent cooling blocks are spliced together to form an outer cooling flow passage; an inner cooling flow passage for cooling the inside of the stator is arranged in the stator inner ring; the connecting cooling flow channels are arranged at two ends of the stator and are respectively communicated with the inner cooling flow channel and the outer cooling flow channel; the inner cooling runner diameter is smaller than the outer cooling runner diameter.

According to the stator cooling structure, the cooling flow channels are arranged inside and outside the stator, so that the whole stator can be effectively cooled, the cooling sleeve is arranged into the block structure, the cooling sleeve is convenient to disassemble, the flow channel structure can be formed by utilizing the spliced part of the sleeve block, the cooling structure is simplified, parts are reduced, the cost is reduced, the whole stator of the motor can be effectively cooled, and a series of problems that the stator of the high-speed motor is difficult to install and disassemble, the stator is serious in heating, the internal heat dissipation and cooling are insufficient and the like are solved.

As a further improvement of the invention, a ventilation opening is arranged on each cooling partition.

Through the structure setting above, the installation and the disassembly of complete machine stator of being convenient for, every aluminum sleeve sets up vent and cooling runner simultaneously, is convenient for implement effective cooling, avoids trompil at stator tooth yoke portion, does not have any influence to iron core magnetic density and iron loss, does not influence motor electromagnetic properties.

As a further improvement of the invention, the number of the internal cooling flow channels is a plurality of, and the internal cooling flow channels are arranged in each slot wedge opening of the inner ring of the stator.

As a further improvement of the invention, the connecting cooling flow passage comprises a reducing connecting pipeline, wherein the big end of the reducing connecting pipeline is communicated with the outer cooling flow passage, and the small end of the reducing connecting pipeline is communicated with the inner cooling flow passage.

As a further improvement of the invention, the joint cooling flow channel also comprises an inner ring connecting pipeline and an outer ring connecting pipeline; wherein:

the inner ring connecting pipelines are arranged at two ends of the stator and are respectively connected with two ends of all the inner cooling flow channels;

the outer ring connecting pipeline is arranged at the first end of the stator and is connected with all the outer cooling flow channels at the first end;

One end of the variable-diameter connecting pipeline positioned at the first end of the stator is connected with the inner ring connecting pipeline, and the other end of the variable-diameter connecting pipeline is connected with the outer ring connecting pipeline;

one end of the reducing connecting pipeline positioned at the second end is connected with the inner ring connecting pipeline, and the other end of the reducing connecting pipeline is connected with the outer cooling flow passage.

As a further improvement of the invention, a space is left between the connecting cooling flow channel and the end of the cooling sleeve.

As a further improvement of the invention, the inner cooling runner is made of insulating material; and/or the reducing connecting pipeline is made of insulating materials.

As a further improvement of the invention, the reducing connecting pipeline, the inner cooling flow passage and the outer cooling flow passage are in-phase direct connection or misphased inclined connection structures.

As a further improvement of the present invention, the diameter ratio of the inner cooling flow passage and the outer cooling flow passage is 0.4 to 0.8.

As a further improvement of the invention, the reducing connecting pipeline is of a straight pipe structure in the vertical direction and is embedded in the gap of each two-phase winding of the stator; or, the reducing connecting pipeline is of a bent pipe structure in the vertical direction and is arranged along the end part of the stator winding coil in an extending way.

The invention provides a stator assembly, which comprises a stator core and a stator cooling structure for cooling the stator core.

According to the stator assembly provided by the invention, a cooling flow path is formed at the split joint of the aluminum sleeve, a stator inner ring slot wedge is combined, a cooling loop is constructed through a reducer pipe, the reducer pipe is embedded at the gap of each two phases of windings of the stator, the windings are guaranteed to be sufficiently cooled and can serve as insulation, in addition, the inner ring and the outer ring of a cooling pipeline are respectively communicated through pipelines at one end of the aluminum sleeve, the inner ring of the pipeline is communicated through pipelines at the other end of the aluminum sleeve, flow path inlets and outlets are formed at two positions which are randomly symmetrical, and various cooling mediums are introduced, so that the inner side of the pipeline is cooled in a circulating way, and the heat dissipation effect is improved; when the ratio of the constraint reducer pipe, namely the diameter ratio of the cooling flow path at the inner ring and the outer ring, is 0.4-0.8, the flow range in the circulating pipeline is relatively larger under the same condition, namely the stator cooling effect is better, so that the power density and the running stability of the motor are improved.

The invention provides a motor, which comprises the stator assembly.

The motor provided by the invention comprises a novel stator cooling structure, and the cooling structure can be used for effectively cooling the whole motor stator, so that a series of problems of difficult installation and disassembly of the high-speed motor stator, serious stator heating, insufficient internal heat dissipation and cooling and the like are solved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art motor stator winding end cooling apparatus; aluminum sleeve block

FIG. 2 is a top view of cooling segments in the stator cooling structure of the present invention;

FIG. 3 is an isometric view of a cooling block in the stator cooling structure of the present invention;

FIG. 4 is a front view of a variable diameter connecting tube in the stator cooling structure of the present invention;

FIG. 5 is a schematic view of the connection of the variable diameter connecting pipe to the inner and outer cooling flow paths in the stator cooling structure of the present invention;

FIG. 6 is a partial front view of the stator cooling structure of the present invention with the variable diameter connecting duct connected to the inner and outer cooling flow paths;

FIG. 7 is a side view of FIG. 6;

FIG. 8 is a schematic structural view of a stator cooling structure of the present invention;

FIG. 9 is a schematic view of an embodiment of a cooling medium inlet and outlet in a stator cooling structure according to the present invention;

FIG. 10 is a schematic structural view of the stator assembly of the present invention;

FIG. 11 is a cross-sectional view of FIG. 10;

FIG. 12 is a schematic view of the structure of an embodiment of the stator assembly of the present invention; end cooling standby scheme

FIG. 13 is a schematic illustration of a stator assembly according to one embodiment of the present invention with a cooling block removed;

FIG. 14 is a schematic view of an embodiment of a stator assembly of the present invention cooling an end of a stator winding package;

FIG. 15 is a top view of the stator assembly of the present invention;

FIG. 16 is a graph showing the flow rate difference of corresponding pipelines when the diameter of the variable-diameter connecting pipeline in the stator assembly is different under the same condition.

1, A cooling sleeve; 2. cooling and blocking; 3. an outer flow channel half-groove; 4. an external cooling flow passage; 5. an internal cooling runner; 6. a vent; 7. a reducing connecting pipe; 8. the inner ring is connected with a pipeline; 9. the outer ring is connected with a pipeline; 10. a stator core; 11. a stator winding coil; 12. a cooling medium inlet; 13. a cooling medium outlet; 14. a step surface; 15. slot wedge opening.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.

The invention provides a stator cooling structure, which is applied to a high-speed motor and used for cooling and radiating the inside and the outside of a stator core 10, and particularly in the embodiment, the stator cooling structure comprises a cooling sleeve 1 sleeved outside a stator, and in order to improve the cooling effect, the cooling sleeve 1 is made of aluminum material, namely a cooling aluminum sleeve;

As shown in fig. 2-3, in order to facilitate the disassembly and assembly of the stator core 10, in this embodiment, the cooling sleeve 1 is of a split structure and is formed by splicing a plurality of cooling blocks 2 end to end; the cooling function aluminum sleeve on the outer side of the stator is designed in a block manner, so that the stator is convenient to detach, and all the cooling blocks 2 can be spliced together to form a cylindrical cooling sleeve 1; the connection structure of the cooling sub-blocks 2 during splicing can be spliced and connected by adopting a concave-convex fit mode or a screw mode.

The splicing side of each cooling block 2 is provided with an inward concave outer flow passage half groove 3, and the outer flow passage half grooves 3 on two adjacent cooling blocks 2 are spliced together to form an outer cooling flow passage 4; by providing the outer cooling flow passage 4 in the cooling sleeve 1 outside the stator core 10, heat dissipation and temperature reduction can be performed by flowing a cooling medium through the outer cooling flow passage 4.

Since the number of the cooling segments 2 is plural, the number of the outer cooling passages 4 formed is plural, and the cooling segments are uniformly arranged in the circumferential direction of the cooling jacket 1.

While all the outer cooling flow passages 4 may share one cooling medium inlet 12 and one cooling medium outlet 13, a plurality of cooling medium inlets 12 and a plurality of cooling medium outlets 13 may be provided as long as the cooling medium can flow through all the outer cooling flow passages 4.

As shown in fig. 8 and 9, in order to facilitate cooling of the inside of the stator core 10, in the present embodiment, an inner cooling flow passage 5 for cooling the inside of the stator is provided in the stator inner ring; the inner cooling runner 5 is arranged to cool the inside of the stator core 10; in order to simplify the cooling structure and reduce the number of parts, the inner cooling runner 5 and the outer cooling runner 4 can be communicated together to form a loop structure, so that one cooling medium inlet 12 and one cooling medium outlet 13 can finish the circulation heat dissipation and cooling of the cooling medium in all the outer cooling runners 4 and the inner cooling runner 5, and the cooling device specifically comprises a joint cooling runner which is arranged at two ends of the stator and is respectively communicated with the inner cooling runner 5 and the outer cooling runner 4.

And the outer cooling flow channel 4, the inner cooling flow channel 5 at the position of the stator inner ring slot wedge 15 and the connecting cooling flow channel which are formed by splicing the aluminum sleeves construct a cooling circulation loop to cool the stator core 10 and the inner winding.

Here, the stator ends here refer to both ends along the stator axial direction.

According to the stator cooling structure provided by the invention, the cooling flow channels are arranged inside and outside the stator, so that the whole stator can be effectively cooled, the cooling sleeve 1 is arranged into the block structure, the cooling sleeve 1 is convenient to disassemble, the flow channel structure can be formed by utilizing the spliced part of the sleeve blocks, the cooling structure is simplified, parts are reduced, the cost is reduced, the whole stator of the motor can be effectively cooled, and a series of problems of difficult installation and disassembly of the stator of the high-speed motor, serious heating of the stator, insufficient internal heat dissipation and cooling and the like are solved.

As shown in fig. 2, 3, 10, 11, 12, 13, and 14, in order to further improve the heat dissipation effect, in this embodiment, a ventilation opening 6 is further provided through each cooling block 2.

Of course, a water cooling flow passage structure can be arranged in all or part of the cooling sub-blocks 2 to provide a better cooling effect, but the problem of high cost exists in the arrangement of the cooling flow passage structure in the interior; of course, a water tank may be disposed in the cooling block 2 to enhance the cooling effect.

Through the structure setting above, the installation and the disassembly of complete machine stator of being convenient for, vent 6 and cooling runner are offered to every aluminum sheathing simultaneously, are convenient for implement effective cooling, avoid opening at stator tooth yoke portion, have any influence to iron core magnetic density and iron loss, do not influence motor electromagnetic properties.

It should be noted that, in this embodiment, as shown in fig. 8, 10, 12 and 15, the number of the internal cooling channels 5 is several, and the internal cooling channels 5 are disposed in each slot wedge opening of the inner ring of the stator, and because the slot wedge opening 15 in the inner ring of the stator is of an inherent structure, the internal cooling channels 5 of the present invention are disposed by using the existing slot wedge opening 15 in the stator, and by adopting such a structure, not only the heat dissipation inside the stator core 10 is realized, but also other components are not required to be additionally disposed, and structural transformation is not required, and the arrangement is more convenient and simple. Slot wedges are used to block windings in stator teeth, a term known in the art.

Considering that the space inside the stator core 10 is limited and the space outside is large, in order to ensure the cooling effect as much as possible, in this embodiment, the specifications of the inner cooling channel and the outer cooling channel are different, the diameter of the inner cooling channel 5 positioned inside is smaller than that of the outer cooling channel 4, the diameter is changed to realize the optimal cooling, the internal pipeline of the stator is limited by the layout and is smaller, but the external aluminum sleeve pipeline of the stator can be customized, so the diameter is changed.

As shown in fig. 4-7 and 16, the diameter ratio of the inner cooling flow channel 5 to the outer cooling flow channel 4 is optimally 0.4-0.8, and when the diameter ratio is adopted, the flow range in the circulating pipeline is relatively larger and the cooling is better under the same condition.

Because the diameters of the inner and outer cooling runners are different, in this embodiment, the joint cooling runner for connecting the inner and outer cooling runners includes a reducing connecting pipe 7, wherein a large end of the reducing connecting pipe 7 communicates with the outer cooling runner 4, and a small end of the reducing connecting pipe 7 communicates with the inner cooling runner 5.

In order to realize that all the inner cooling runners 5 and the outer cooling runners 4 form a large circulation loop, a runner structure capable of connecting all the inner cooling runners 5 together and a runner structure capable of connecting all the outer cooling runners 4 together are also required to be arranged, and in particular, the connecting cooling runners further comprise an inner ring connecting pipeline 8 and an outer ring connecting pipeline 9; wherein:

The inner ring connecting pipelines 8 are arranged at two ends of the stator and are respectively connected with two ends of all the inner cooling flow channels 5;

the outer ring connecting pipeline 9 is arranged at the first end of the stator and is connected with all the outer cooling flow channels 4 at the first end;

One end of a variable-diameter connecting pipeline 7 positioned at the first end of the stator is connected with an inner ring connecting pipeline 8, and the other end of the variable-diameter connecting pipeline is connected with an outer ring connecting pipeline 9;

One end of the reducing connecting pipeline 7 positioned at the second end is connected with the inner ring connecting pipeline 8, and the other end is connected with the outer cooling flow passage 4.

The number of the inner cooling flow channels 5 is a plurality, and the inner cooling flow channels are arranged in a ring shape, so that the inner ring connecting pipeline 8 is of a ring-shaped structure; similarly, the number of the outer cooling flow channels 4 is a plurality of the outer cooling flow channels which are annularly arranged, so that the outer ring connecting pipeline 9 is of a circular ring structure.

In order to achieve a large circulation of all the inner cooling channels 5 and the outer cooling channels 4 with one cooling medium inlet 12 and one cooling medium outlet 13, the outer ring connecting duct 9 is provided only at one end of the stator and the inner ring connecting duct 8 is provided at both ends of the stator in this embodiment. And the cooling medium outlet 13 and the cooling medium inlet 12 are provided on the side where the outer race connecting pipe 9 is not provided.

In order to ensure the ventilation effect of the ventilation opening 6 on the cooling partition block 2, a space is reserved between the connected cooling flow passage and the end part of the cooling sleeve 1, the ventilation effect is ensured by arranging the space, and the air flowing out of the ventilation opening 6 of the aluminum sleeve can be further cooled for the connected cooling flow passage.

Because the inner cooling runner 5 is arranged at the slot wedge opening of the stator inner ring, the inner cooling runner 5 is made of insulating materials, thereby not only realizing cooling and heat dissipation, but also being used as a slot wedge. And/or the reducing connecting pipe 7 is made of an insulating material. Since the variable diameter connecting pipe 7 is penetrated at the winding gap, an insulating material is required.

As shown in fig. 8 and 9, it should be noted that the reducing connecting pipe 7 may be in-phase direct connection with the inner cooling flow passage 5 and the outer cooling flow passage 4; of course, the variable diameter connecting pipe 7 may be alternatively connected with the inner cooling flow passage 5 and the outer cooling flow passage 4 by a phase-staggered inclined connection structure, and the arrangement is not particularly limited herein, and may be selected according to practical situations.

Further, in the present embodiment, as shown in fig. 10, 11, 12, and 13, the reducing connecting pipe 7 has a straight pipe structure in the vertical direction, and is embedded in the gap between each two phases of windings of the stator;

of course, if it is necessary to cool the stator winding end, as shown in fig. 14, the reducing connecting pipe 7 may be provided in a bent pipe structure in the vertical direction, and may be disposed to extend along the end of the stator winding 11. As shown in fig. 12, the stator assembly of the present invention is a schematic overall structure, that is, the stator assembly includes a stator core 10 and a stator winding 11 on the basis of fig. 10. In fig. 14, when cooling the end of the coil, the corresponding bent pipe can be designed according to the size of the reducing connecting pipe 7, and the bent pipe surrounds the end of the stator winding coil 11 (the bent pipe is unconstrained and the position of the bent pipe is random), and is communicated with the inner ring connecting pipe 8 and the outer ring connecting pipe 9, so that the end of the stator winding coil 11 is cooled.

It should be noted that, the straight pipe in the vertical direction means that the straight pipe is not bent in the vertical direction and is only extended in the same horizontal plane, that is, all the reducing connecting pipes 7 are in the same plane; of course, the extension in the same plane may be straight line extension, or curve extension, or extension mode of combination of multiple curved sections and straight sections;

The bent pipe structure in the vertical direction is provided with bulges or bends in the vertical direction, that is, all the reducing connecting pipelines 7 are respectively positioned in different horizontal planes, and of course, the bent pipe structure can extend in a straight line, can extend in a curve or can extend in a combination of a plurality of bent sections and straight sections when extending in the vertical direction.

As shown in fig. 1 to 16, the stator assembly provided by the invention comprises a stator core 10 and a stator cooling structure for radiating heat from the stator core 10.

According to the stator assembly provided by the invention, a cooling flow path is formed at the split joint of the aluminum sleeve, a stator inner ring slot wedge opening is combined, a cooling circulation loop is constructed through a reducer pipe, the reducer pipe is embedded at the gap between every two phases of windings of the stator, the windings are guaranteed to be sufficiently cooled and can serve as insulation, in addition, the inner ring and the outer ring of a cooling pipeline are respectively communicated through pipelines at one end of the aluminum sleeve, the inner ring of the pipeline is communicated through pipelines at the other end of the aluminum sleeve, flow path inlets and outlets are formed at two positions which are randomly symmetrical, and various cooling mediums are introduced, so that the inner side of the pipeline is circularly cooled, and the heat dissipation effect is improved; when the ratio of the constraint reducer pipe, namely the diameter ratio of the cooling flow paths at the inner ring and the outer ring is 0.4-0.8, under the same condition, the flow range in the circulating pipeline is relatively larger through the Fluent fluid simulation check, namely the stator cooling effect is better under the ratio, so that the power density and the running stability of the motor are improved. In addition, the corresponding pipeline sizes of the inner side and the outer side of the invention can be determined by the ratio, and a circulating pipeline can be constructed.

As shown in fig. 1 to 16, the motor provided by the invention comprises the stator assembly.

As shown in fig. 13, the cooling sleeve 1 (aluminum sleeve) in the stator assembly is formed by splicing a plurality of cooling blocks 2, and the cooling sleeve 1 is provided with a step surface 14 at one side thereof, which can be called a front end, and the step surface 14 can be fixed with the cylinder body during splicing. (the outer surface of the aluminum sleeve assembled by the whole machine needs to be fixed with the cylinder, and the step surface 14 is fixed).

As shown in FIG. 5, the connection structure of the variable diameter connecting pipe 7 in the present invention is shown, the variable diameter connecting pipe 7 is connected with the inner cooling flow passage 5 at one side, the size is a, and is connected with the outer cooling flow passage 4 at the other side, the size is b, and the ratio (a/b) of the sizes of the two ends of the variable diameter connecting pipe 7 is shown in FIG. 7, through simulation study, when the ratio is more than 0.4, the flow rate in the corresponding pipe is generally higher, in addition, because b is the size of the outer cooling flow passage 4 and is necessarily larger than the inner side size a, and in order to ensure design rationality, the variable diameter ratio of the variable diameter connecting pipe 7 is 0.4-0.8, which accords with the conventional design, and can realize larger flow distribution, thereby improving the cooling effect of the stator.

As shown in fig. 6, the reducing connecting pipe 7 is spliced with two side pipes, the installation mode is not restricted, welding, interference assembling, gluing and the like are possible, wherein the reducing connecting pipe 7 is made of insulating materials, the reducing connecting pipe 7 is required to penetrate out from the adjacent two-phase gaps of the winding in order to realize sufficient contact heat dissipation, the material of the outer cooling runner 4 is not limited, and the inner cooling runner 5 is also required to be made of insulating materials due to direct contact with the winding, and can be used as a slot wedge. In the present invention, the outer shapes of the inner cooling flow passage 5 and the outer cooling flow passage 4 and the joint cooling flow passage are not limited to cylindrical, and may be any shape as long as they have a passage therein. In addition, the wind flowing in the whole machine can also realize the effect of reducing the wind temperature through the internal cooling flow channel 5, thereby indirectly realizing the internal rotor cooling.

As shown in fig. 9, the cooling sleeve comprises an inner cooling runner 5, an outer cooling runner 4, a reducing connecting pipeline 7, an inner ring connecting pipeline 8, an outer ring connecting pipeline 9, a cooling medium inlet 12 and a cooling medium outlet 13, on the basis of the above, the reducing connecting pipeline 7 can be directly connected with the inner cooling runner 5 and the outer cooling runner 4 at corresponding positions, or can be alternatively connected in an inclined manner (in the figure, the cooling sleeve 1 is only in a straight connection manner, no matter in phase or in a wrong phase, the winding is in a gap state, a stator shaping and binding process is adopted, the reducing pipe is placed in a visible seam), the inner ring connecting pipeline 8 is communicated with the inner cooling runner 5 at the inner ring of the stator to form a circulation flow path, the outer ring connecting pipeline 9 is communicated with the outer cooling runner 4 in the aluminum sleeve to form a circulation flow path, the inner ring connecting pipeline 8 is arranged at both ends of the stator core 10 (namely, the front end and the tail end), the outer ring connecting pipeline 9 is only arranged at the tail end of the cooling sleeve 1, the front end (with a cylinder matched end) of the cooling sleeve 1 is not provided with the outer ring connecting pipeline 9, the cooling medium inlet 12 and the cooling medium outlet 13 are arranged at the front end of the cooling sleeve 1, the cooling sleeve 1 is matched with the cooling medium inlet 13 and the cooling medium can be conveniently fixed on the cooling medium inlet 13.

As shown in fig. 10, the joint cooling flow passage is spaced from the end of the cooling sleeve 1 by a certain gap, so that the gas flowing out of the ventilation opening 6 can further cool the joint cooling flow passage.

It should be noted that, in the present invention, the cooling flow channel may be filled with cooling liquid or other cooling medium with better cooling effect, and there is no limitation here; the pipeline installation and fixation mode is not limited, but sealing measures, an O-shaped ring or radiating silica gel coating and the like are adopted; in addition, the invention is used for reducing the processing cost, does not select a built-in water cooling flow passage structure, and can provide a better cooling effect, and a water tank can be arranged in the cylinder or the aluminum sleeve.

The invention solves the problems of serious heating but insufficient cooling of the stator in the high-speed motor very conveniently, and can effectively prevent the phenomenon of higher local temperature of the stator, thereby improving the whole temperature control performance of the motor and the service life of the motor.

Here, first, the "inward" is a direction toward the center of the accommodating space, and the "outward" is a direction away from the center of the accommodating space.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 9 are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The stator cooling structure is characterized by comprising a cooling sleeve sleeved outside a stator; the cooling sleeve is of a split structure and is formed by sequentially splicing a plurality of cooling blocks; the splicing side of each cooling block is provided with an outer flow passage half groove, and the outer flow passage half grooves on two adjacent cooling blocks are spliced together to form an outer cooling flow passage; an inner cooling flow passage for cooling the inside of the stator is arranged in the stator inner ring; the connecting cooling flow channels are arranged at two ends of the stator and are respectively communicated with the inner cooling flow channel and the outer cooling flow channel; the diameter of the inner cooling flow passage is smaller than that of the outer cooling flow passage;

the connecting cooling flow passage comprises a reducing connecting pipeline, wherein the big head end of the reducing connecting pipeline is communicated with the outer cooling flow passage, and the small head end of the reducing connecting pipeline is communicated with the inner cooling flow passage;

The connecting cooling flow passage also comprises an inner ring connecting pipeline and an outer ring connecting pipeline; wherein:

2. The stator cooling structure of claim 1, wherein each cooling block is further provided with a vent therethrough.

3. The stator cooling structure according to claim 1, wherein the number of the inner cooling flow passages is several, and the inner cooling flow passages are provided in each slot wedge of the inner ring of the stator.

4. The stator cooling structure of claim 1 wherein a space is left between the joined cooling flow channels and the cooling sleeve ends.

5. The stator cooling structure according to claim 1, wherein the inner cooling runner is made of an insulating material; and/or the reducing connecting pipeline is made of insulating materials.

6. The stator cooling structure according to claim 1, wherein the reducing connecting pipe is in-phase direct connection or in-phase oblique connection with the inner cooling flow passage and the outer cooling flow passage.

7. The stator cooling structure according to claim 1, wherein a diameter ratio of the inner cooling runner and the outer cooling runner is 0.4 to 0.8.

8. The stator cooling structure according to claim 1, wherein the reducing connecting pipe is a straight pipe structure in a vertical direction, embedded in a gap between each two phases of windings of the stator; or, the reducing connecting pipeline is of a bent pipe structure in the vertical direction and is arranged along the end part of the stator winding coil in an extending way.

9. A stator assembly comprising a stator core and a stator cooling structure according to any one of claims 1-8 for cooling the stator core.

10. An electric machine comprising the stator assembly of claim 9.