CN117239984A - Motor, air compressor and cooling oil cooling system thereof - Google Patents

Abstract

The application provides a motor, an air compressor and a cooling oil cooling system thereof, wherein the cooling oil cooling system comprises: the second end of the motor shell is provided with an end cover, and a second cooling flow passage is formed in the end cover; stator module assembles in motor housing, including stator core, stator core has a plurality of stator teeth, form the stator groove between two adjacent stator teeth, be equipped with the heat pipe in each stator groove, one side terminal surface that stator core is close to the end cover is first terminal surface, the embedment has the heat conduction spare between first terminal surface and the end cover, the heat conduction spare parcel is in stator winding stretches out in the periphery side of the end of first terminal surface, the evaporation zone of heat pipe is in each stator inslot and with each stator inslot correspond around the stator winding contact of establishing, the condensation zone of heat pipe stretches out first terminal surface and is fixed a position the parcel by the heat conduction spare. The application can effectively prevent the accumulation of heat in the stator winding and effectively cool the stator winding end.

Description

Motor, air compressor and cooling oil cooling system thereof

Technical Field

The application belongs to the technical field of air compressor design, and particularly relates to a motor, an air compressor and a cooling oil cooling system of the air compressor.

Background

The existing air compressor (namely, the air compressor) motor is connected in two modes, one connecting mode is split type, the motor is connected with an air compressor joint by adopting intermediate connectors such as a coupler, and the motor adopts air cooling heat dissipation; the connection mode is direct connection, wherein the connection mode is that a motor is directly connected with an air compressor, a motor hollow shaft is connected with an air compressor shaft cone shaft, and the motor is subjected to liquid cooling and heat dissipation. Compared with the two connection modes, the direct-connection motor has the advantages of good heat dissipation effect, high power density, no redundant parts such as bearings and the like, and gradually replaces the split motor.

The direct-connected motor is usually a permanent magnet motor, the power density of the direct-connected motor is extremely high, the main reason for limiting the volume of the direct-connected motor to be further reduced is that the power density is extremely high, the motor and an air compressor commonly share a set of cooling system, the temperature of the cooling oil inlet is increased to 80 ℃ and the temperature limit of the outlet oil is not higher than 130 ℃ aiming at the motor of the air compressor, so that the temperature of the motor must be controlled within 50K, the temperature of the motor is more highly required, the prior general technical scheme is that the motor shell is cooled by oil, the stator is encapsulated by encapsulation, and the like, namely, the stator core conducts heat to the motor shell through encapsulation heat conducting pieces, thereby realizing indirect cooling of the stator core through the oil cooling of the motor shell, but the indirect cooling of the stator core through the motor shell is lower in cooling efficiency, and in addition, the part of heat cannot be effectively cooled due to the fact that a direct contact relation does not exist between the winding end part of the stator core and the stator core.

Disclosure of Invention

Therefore, the application provides a motor, an air compressor and a cooling oil cooling system thereof, which can solve the technical problems that in the prior art, the cooling efficiency is low and the stator winding end cannot be effectively cooled due to the fact that a cooling flow passage is arranged in a motor shell only for cooling the motor.

In order to solve the above-described problems, the present application provides a motor including:

the second end of the motor shell is provided with an end cover, and a second cooling flow passage is formed in the end cover;

the stator assembly is assembled in the motor shell and comprises a stator core, the stator core is provided with a plurality of stator teeth, a stator groove is formed between every two adjacent stator teeth, a heat pipe is inserted in each stator groove, one side end face of the stator core, which is close to the end cover, is a first end face, a heat conducting piece is encapsulated between the first end face and the end cover, the heat conducting piece is wrapped on the outer peripheral side of the end of the first end face, the evaporation section of the heat pipe is positioned in each stator groove and is contacted with the corresponding stator winding wound in each stator groove, and the condensation section of the heat pipe extends out of the first end face and is wrapped by the heat conducting piece in a positioning manner.

In some embodiments of the present application, in some embodiments,

the inner side surface of the end cover is provided with a plurality of heat pipe end slots, and the ends of the heat pipes are respectively inserted into the heat pipe end slots in a one-to-one correspondence manner.

In some embodiments of the present application, in some embodiments,

the stator teeth comprise connecting arms connected with the yoke parts of the stator iron cores, first heat pipe positioning grooves are formed in the side faces of the connecting arms, the first heat pipe positioning grooves penetrate through the stator iron cores along the axial direction, and part of the heat pipes are inserted into the first heat pipe positioning grooves.

In some embodiments of the present application, in some embodiments,

the first heat pipe positioning groove is positioned at the center of the radial length of the connecting arm.

In some embodiments of the present application, in some embodiments,

the stator core is also provided with an insulating framework, the insulating framework is provided with a groove inner wall body which covers the groove vertical wall of the stator groove, a second heat pipe positioning groove is formed in the position of the groove inner wall body and the position of the first heat pipe positioning groove, the second heat pipe positioning groove is embedded in the first heat pipe positioning groove, and part of the heat pipe is inserted in the second heat pipe positioning groove.

In some embodiments of the present application, in some embodiments,

on any axial section of the stator core, the height of the part of the heat pipe protruding out of the notch of the first heat pipe positioning groove or the second heat pipe positioning groove is H, and the thickness of a single-side winding of the stator winding is d, and d/2 is less than or equal to H and less than or equal to d.

In some embodiments of the present application, in some embodiments,

the motor comprises a motor shell, and is characterized in that a first cooling flow passage is formed in the motor shell and used for cooling at least a stator core in the motor shell, an oil inlet pipe and an oil return pipe are formed in the motor shell, an inlet of the first cooling flow passage and an inlet of the second cooling flow passage are connected together and connected to the oil inlet pipe, and an outlet of the first cooling flow passage and an outlet of the second cooling flow passage are connected together and connected to the oil return pipe.

In some embodiments of the present application, in some embodiments,

the first cooling flow passage is provided with a plurality of axial flow passages extending along the axial direction of the motor shell and a plurality of circumferential flow passages extending along the circumferential direction of the motor shell, and each circumferential flow passage is communicated and connected with the first ends or the second ends of two adjacent axial flow passages so that the first cooling flow passage forms an S shape which is arranged around the central axis of the motor shell; and/or the second cooling flow passage comprises a full-width cooling part and a half-width cooling part, and the cooling oil sequentially flows through the oil inlet pipe, the full-width cooling part, the half-width cooling part and the oil return pipe.

In some embodiments of the present application, in some embodiments,

the full-width cooling part comprises a plurality of first straight flow channels extending along a first direction and a plurality of second straight flow channels extending along a second direction, each second straight flow channel is connected with a first end or a second end of two adjacent first straight flow channels in a communicating mode so that the full-width cooling part forms an S shape, the end cover is provided with a central symmetry line parallel to the second direction, the half-width cooling part comprises a first cooling part positioned on the first side of the central symmetry line and a second cooling part positioned on the second side of the central symmetry line, the first cooling part and the second cooling part are respectively provided with a plurality of third straight flow channels extending along the first direction and a plurality of fourth straight flow channels extending along the second direction, each fourth straight flow channel is connected with the first end or the second end of the two adjacent third straight flow channels in a communicating mode so that the half-width cooling part forms an S shape which is positioned on the two sides of the central symmetry line and is communicated with each other, the first cooling part and the second cooling part are respectively provided with the first straight flow channels and the second straight flow channels which are respectively arranged in the same direction as the first straight flow channels and the second straight flow channels respectively.

The present application also provides an air compressor, characterized by comprising:

a compression assembly including a compressor housing;

as with the motor described above, the first end of the motor housing is connected to the first end of the compressor housing.

The application also provides a cooling oil cooling system of the air compressor, which comprises:

the oil pump, the first oil cooler and the air compressor are communicated with the oil inlet pipe through a first pipeline, the oil return pipe is communicated with the oil inlet on the compressor shell through a second pipeline, and the oil outlet on the compressor shell is communicated with the oil pump through a third pipeline.

In some embodiments of the present application, in some embodiments,

the first pipeline is connected with a second oil cooler in parallel, and the second oil cooler is provided with a first state connected with the first oil cooler in series and a second state bypassed by the first pipeline.

The motor, the air compressor and the cooling oil cooling system thereof provided by the application have the following beneficial effects:

the first cooling flow channel and the second cooling flow channel are respectively constructed in the motor shell and the end cover, so that comprehensive and efficient cooling of the stator core and the stator winding can be formed, and the second cooling flow channel can be particularly used for efficiently cooling the end parts of the stator winding corresponding to the end cover, so that the temperature rise of the motor meets the requirement, and the overall size of the air compressor is further reduced;

through the design of the full-width cooling part and the half-width cooling part, the cooling effect is ensured by covering the end cover to the maximum extent of the cooling flow channel, and the structure of the oil inlet and return port shared by the first cooling flow channel and the second cooling flow channel is more reasonable;

the heat pipe is inserted into each stator slot, so that the heat of the stator winding in the stator slot is conducted to the position of the condensing section of the heat pipe and is further conducted to the end cover or the motor shell through the heat conducting piece to be cooled through the second cooling flow channel or the first cooling flow channel, the accumulation of the heat in the stator winding is effectively prevented, and meanwhile, the heat conducting piece can reliably position the heat pipe while realizing the heat conducting function;

the cooling flow channels in the motor and the cooling flow channels in the compressor component are connected in series through the first oil cooler to form a heat dissipation circulation flow path, so that the pipeline design of the air compressor is simplified, and the construction cost of the system is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the application, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present application, should fall within the ambit of the technical disclosure.

Fig. 1 is a schematic perspective view of a motor housing in an air compressor according to an embodiment of the present application;

FIG. 2 is a schematic view of the motor housing of FIG. 1 in an axial projection thereof, with arrows showing the direction of flow of cooling oil in the second cooling flow passage;

FIG. 3 is a schematic view of the motor housing of FIG. 1 in another embodiment in projection along an axial direction thereof;

FIG. 4 is a schematic internal cross-sectional view of the motor housing of FIG. 1 in one embodiment;

FIG. 5 is a schematic view in internal cross-section of the motor housing of FIG. 1 in another embodiment;

fig. 6 is a schematic perspective view of an assembled stator core, an insulating framework and a heat pipe according to an embodiment of the present application;

fig. 7 is a schematic structural view (axial projection) of a core body of a stator core of an assembled structure according to an embodiment of the present application;

fig. 8 is a schematic structural view (axial projection) of an insulating skeleton provided corresponding to the core sub-body in fig. 7;

FIG. 9 is a schematic view of the internal structure of the heat pipe of FIG. 6;

FIG. 10 is a schematic view of the motor housing in another embodiment of the application;

FIG. 11 is a schematic diagram of a cooling oil cooling system of an air compressor according to an embodiment of the present application;

fig. 12 is another schematic view of a cooling oil cooling system of an air compressor according to an embodiment of the present application.

The reference numerals are expressed as:

11. a compressor housing;

111. an oil inlet; 112. an oil outlet;

21. a motor housing; 211. a first cooling flow passage; 212. an oil inlet pipe; 213. an oil return pipe; 22. an end cap; 221. a second cooling flow path; 222. a bearing chamber; 223. a slot at the end of the heat pipe; 23. a stator core; 231. a first heat pipe positioning groove; 2321. a clamping protrusion; 2322. a clamping groove; 24. a connecting flange plate; 25. a rotor; 26. a bearing; 27. an insulating skeleton; 271. a second heat pipe positioning groove;

3. a heat conductive member;

4. a heat pipe;

41. a condensing section; 42. an insulation section; 43. an evaporation section;

100. an oil pump; 101. a first oil cooler; 102. a second oil cooler; 103. a temperature detecting part.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

Referring to fig. 1 and 12 in combination, according to an embodiment of the present application, there is provided an air compressor including:

a compression assembly comprising a compressor housing 11, the compressor housing 11 having associated compression components, such as a turbine or the like, disposed therein for compressing air entering therein;

the motor comprises a motor shell 21, wherein a first end of the motor shell 21 is connected with a first end of the compressor shell 11, specifically, a connecting flange 24 is arranged at the first end of the motor shell 21, the motor shell 21 is detachably connected with the compressor shell 11 through the connecting flange 24, an end cover 22 is arranged at a second end of the motor shell 21, a stator iron core 23, a stator winding arranged on the stator iron core 23, a rotor 25 and the like are arranged in the motor shell 21, a rotating shaft of the rotor 25 is in driving connection with a compression part in the compressor shell 11, and after the stator winding is electrified, the motor can convert electric energy into rotary mechanical energy of the rotor 25, so that driving operation of a compression assembly is realized;

a first cooling flow passage 211 is formed in the motor housing 21, the first cooling flow passage 211 being used for cooling at least the stator core 23 in the motor housing 21, and a second cooling flow passage 221 is formed in the end cover 22, the second cooling flow passage 221 being used for cooling at least the stator winding (not referenced in the figure) on the stator core 23.

In this technical scheme, through constructing first cooling runner 211 and second cooling runner 221 respectively in motor housing 21 and end cover 22 simultaneously to can form the comprehensive and high-efficient cooling to stator core 23 and stator winding, wherein second cooling runner 221 especially can form high-efficient cooling to the tip that stator winding corresponds with end cover 22, makes the motor temperature rise accord with the requirement, is favorable to the further reduction of air compressor overall dimension.

It should be noted that, in the prior art, cooling of the end portion of the stator winding mostly adopts spraying cooling oil or setting a corresponding cooling pipe to be attached to the end portion for cooling, and the two modes correspond to relatively complex heat dissipation structures, so that the implementation performance is poor.

In a preferred embodiment, the end cover 22 and the motor housing 21 are integrally injection molded, and the end cover 22 and the motor housing 21 are integrally injection molded, so that the difficulty in sealing treatment of the assembly between the end cover 22 and the motor housing 21 at the position of the runner structure can be effectively reduced, the improvement of production efficiency is facilitated, and the maintenance probability of subsequent after-sales maintenance is reduced.

Referring to fig. 4 and 5, an end face of the stator core 23, which is close to the end cover 22, is a first end face, a heat conducting member 3 is encapsulated between the first end face and the end cover 22, and the heat conducting member 3 is wrapped on an outer peripheral side of an end of the stator winding, which extends out of the first end face.

In this technical scheme, through wrap up the heat conduction piece 3 of embedment at stator winding's end, can pass through this heat conduction piece 3 high-efficient conduction to with the end cover 22 of heat conduction piece 3 contact and motor housing 21 on, and then further improve first cooling runner 211 and second cooling runner 221 especially second cooling runner 221 to the cooling effect of heat dissipation of stator winding end.

The aforementioned heat conductive member 3 is specifically, for example, epoxy resin, and is formed at the end of the stator winding by injection molding, so that the stator winding, the motor housing 21 and the end cover 22 can be ensured to form seamless connection, and high-efficiency heat conduction can be ensured. Referring further to fig. 4 and 5, the heat conducting member 3 fills the annular space formed by the end cover 22, the motor housing 21 and the end face of the stator core 23, and forms a complete package for the stator winding.

As shown in fig. 1 to 3, the motor housing 21 is provided with an oil inlet pipe 212 and an oil return pipe 213, an inlet (not referenced in the drawing) of the first cooling flow path 211 and an inlet (not referenced in the drawing) of the second cooling flow path 221 are integrally connected to the oil inlet pipe 212, and an outlet of the first cooling flow path 211 and an outlet of the second cooling flow path 221 are integrally connected to the oil return pipe 213.

In this technical solution, the first cooling flow channel 211 and the second cooling flow channel 221 share an oil inlet pipe 212 and an oil return pipe 213, so that the pipeline connection of the cooling system is simplified, and the corresponding cooling oil cooling system is the same system, thereby reducing the manufacturing cost of the system.

In some embodiments, the first cooling flow channel 211 has a plurality of axial flow channels (not labeled in the drawing) extending along the axial direction of the motor housing 21 and a plurality of circumferential flow channels (not labeled in the drawing) extending along the circumferential direction of the motor housing 21, each of the circumferential flow channels being communicatively connected to the first end or the second end of two adjacent axial flow channels such that the first cooling flow channel 211 forms an S-shape disposed around the central axis of the motor housing 21; the second cooling flow channel 221 includes a full-width cooling portion and a half-width cooling portion, and the cooling oil flows through the oil inlet pipe 212, the full-width cooling portion, the half-width cooling portion, and the oil return pipe 213 in this order.

In this technical scheme, the first cooling flow channel 211 designed into the S shape can increase the running coverage area of the cooling flow channel on the motor housing 21, so as to improve the cooling effect of the cooling oil on the internal heating components such as the motor inner stator core 23, and meanwhile, the second cooling flow channel 221 includes a full-width cooling part and a half-width cooling part, so that the second cooling flow channel 221 can form the maximum coverage on the end cover 22, and further ensure the cooling effect of the second cooling flow channel 221 on the internal heating components of the motor.

In a specific embodiment, the full width cooling part comprises a plurality of first straight flow channels extending along a first direction and a plurality of second straight flow channels extending along a second direction, each of the second straight flow channels is connected to a first end or a second end of two adjacent first straight flow channels in a communicating way so that the full width cooling part forms an S shape, the end cover 22 has a central symmetry line parallel to the second direction, the half width cooling part comprises a first cooling part positioned on a first side of the central symmetry line and a second cooling part positioned on a second side of the central symmetry line, a plurality of third straight flow channels extending along the first direction and a plurality of fourth straight flow channels extending along the second direction are arranged in the first cooling part and the second cooling part, each of the fourth straight channels is connected to the first end or the second end of the two adjacent third straight channels in a communicating manner so that the half-width cooling portions are formed into an S shape that is located at two sides of the central symmetry line and is communicated with the first end or the second end of the adjacent third straight channels, the third straight channels respectively provided with the first cooling portions and the second cooling portions are respectively arranged in a one-to-one correspondence manner in the first direction (i.e., the third straight channels at two ends in the same vertical direction in the direction shown in fig. 2), cooling oil in the corresponding third straight channels has the same flow direction, the cooling oil in the fourth straight channels respectively provided with the first cooling portions and the second cooling portions has the opposite flow directions, the first direction and the second direction are perpendicular to the end face of the end cover 22, the first direction is the vertical direction with the direction shown in fig. 2 as a reference, and the second direction is the horizontal direction.

In this technical scheme, through the design to full width of cloth cooling part and half width of cloth cooling part for when cooling runner furthest covers end cover 22 and guarantees the cooling effect, can also make the structure of first cooling runner 211 and second cooling runner 221 both sharing advance the oil return mouth more reasonable.

With continued reference to fig. 2, the oil inlet pipe 212 and the oil return pipe 213 are respectively disposed on two adjacent axial flow passages in a one-to-one correspondence manner, so that oil inlet and return of cooling oil can form a comprehensive surrounding of approximately 360 ° for the motor housing 21, and further heat dissipation effect is improved. In a preferred embodiment, the oil inlet direction of the oil inlet pipe 212 is parallel to the oil inlet direction of the first straight flow passage communicated with the oil inlet pipe, and the oil return direction of the oil return pipe 213 is parallel to the oil return direction of the third straight flow passage communicated with the oil return pipe, and the oil inlet direction of the oil return pipe is coincident with the oil inlet direction of the first straight flow passage.

Referring to fig. 3, in some embodiments, the number of the axial flow channels is N1, each of the axial flow channels is uniformly spaced around the central axis of the motor housing 21, the corresponding pitch circle diameter is D, the maximum width of each of the axial flow channels in the circumferential direction of the motor housing 21 is M1, the maximum distance between two adjacent axial flow channels in the second direction is L1, the widths of each of the first straight flow channel and the third straight flow channel are M2, the center distance between the first straight flow channel communicated with the oil inlet pipe 212 and the third straight flow channel communicated with the oil return pipe 213 is L2, pi×d/N1-M1 < l2+m2 < L1, so as to ensure that the setting position of the oil inlet pipe 212 and the setting position of the oil return pipe 213 are exactly corresponding to two adjacent axial flow channels respectively, and the inlet and outlet of the second cooling flow channel 221 are also corresponding to the oil inlet pipe 212 and the oil return pipe 213 respectively, so as to ensure the sharing purpose of the interface. It can be understood that the axial flow passage corresponding to the oil feed pipe 212 and the axial flow passage corresponding to the oil return pipe 213 are adjacent flow passages, but are not directly communicated with each other through the circumferential flow passage.

The sum of the numbers of the first straight flow channel and the third straight flow channel is N2, N2 = 2K+2, wherein K is a positive integer.

In some embodiments, the flow area of the axial flow channel is S1, and the flow areas of the first straight flow channel are S2, S1 and S2.

Referring to fig. 5, in a specific embodiment, a bearing chamber 222 is formed on the inner side surface of the end cover 22, and a bearing 26 is disposed in the bearing chamber 222, for reliably supporting one end of the rotating shaft of the rotor 25, and at this time, the second cooling flow passage 221 is also capable of effectively cooling the bearing 26.

In another preferred embodiment, a heat pipe 4 is inserted into each stator slot of the stator core 23, the evaporation section 43 of the heat pipe 4 is located in each stator slot and contacts with the stator winding correspondingly wound in each stator slot, and the condensation section 41 of the heat pipe 4 extends out of the first end face and is positioned and wrapped by the heat conducting member 3.

In this technical solution, by inserting the heat pipe 4 into each stator slot, the heat of the stator winding in the stator slot is conducted to the position of the condensing section 41 of the heat pipe 4 and further conducted to the end cover 22 or the motor housing 21 through the heat conducting member 3, and cooled through the second cooling flow channel 221 or the first cooling flow channel 211, so as to effectively prevent the accumulation of the heat inside the stator winding. Meanwhile, the heat conducting piece 3 can reliably locate the heat pipe 4 while achieving the heat conducting function.

The stator core 23 has a plurality of stator teeth, two adjacent stator teeth form between the stator teeth the stator groove, the stator teeth include with the yoke portion of stator core 23 is connected the linking arm, be formed with first heat pipe constant head tank 231 on the side of linking arm, first heat pipe constant head tank 231 is along the axial link up of stator core 23, part heat pipe 4 cartridge in first heat pipe constant head tank 231.

In this technical scheme, through the partial structure formation cartridge of first heat pipe constant head tank 231 and heat pipe 4, can make the position of heat pipe 4 more stable.

The first heat pipe positioning groove 231 is located at a central position of the radial length of the connecting arm. Therefore, when the stator winding is wound on the connecting arm, the stator winding is divided into a radial inner part and a radial outer part by the heat pipe 4 in the radial direction of the stator core 23, and the occupation of the heat pipe 4 objectively reduces the slot filling rate of the stator slot, but because the heat pipe 4 is inserted into the stator winding, the heat in the stator winding can be more effectively transferred to the condensing section 41 in time so as to realize efficient cooling, thereby reducing the temperature rise of the motor, especially the stator winding, and improving the power density of the motor. The aforementioned centered position refers in particular to a position where the radial thickness of the radially inner and radially outer two-part stator windings can be made equal.

The heat pipe 4 is a phase change heat transfer device, and a possible heat pipe structure is shown in fig. 9, and mainly comprises a shell (not indexed in the figure), a liquid suction core (not indexed in the figure) and a working medium (not indexed in the figure), and is axially divided into a condensation section 41, an insulation section 42 and an evaporation section 43. The shell of the heat pipe is of a sealing structure and is vacuumized, the liquid suction core is attached to the inner wall of the shell, and the working medium is gasified when meeting hot air in the evaporation section and absorbs a large amount of heat, so that the gas pressure of the evaporation section 43 rises and drives the working medium gas to move to the condensation section 41; the vapor is liquefied and releases heat when meeting cold in the condensing section 41, and the condensed liquid working medium returns to the evaporating section 43 under the drive of the liquid suction core. While the length of the insulation section 42 may be designed to be as small as practical.

In a specific embodiment, the stator core is formed by splicing a plurality of iron core sub-bodies with the same structure, as shown in fig. 7, the left end and the right end of the yoke portion of each iron core sub-body are respectively and correspondingly provided with a clamping protrusion 2321 and a clamping groove 2322, and the clamping protrusion 2321 at one end of one of the two adjacent iron core sub-bodies is clamped with the clamping groove 2322 corresponding to the other iron core sub-body to finally realize that the plurality of iron core sub-bodies are spliced to form a circular stator core. In this technical scheme, form stator core through the mode that a plurality of iron core sub-bodies splice into the circle, on the one hand can reduce iron core die sinking cost, on the other hand then can do benefit to the automation of realizing motor wire winding.

In another preferred embodiment, the stator core 23 is further provided with an insulating frame 27, and generally, the insulating frame 27 includes two frame components that are inserted up and down, so as to form an insulating package on the end surface of the stator core 23 and the vertical surface of the stator slot, and in one embodiment, the insulating frame 27 may be designed as a plurality of frame sub-assembly structures, so as to correspond to the split stator core 23.

Referring specifically to fig. 8, the insulating frame 27 has a slot inner wall covering the slot standing wall of the stator slot, and a second heat pipe positioning slot 271 is configured at the position of the slot inner wall and the first heat pipe positioning slot 231, where the second heat pipe positioning slot 271 is embedded in the first heat pipe positioning slot 231, and a part of the heat pipe 4 is inserted in the second heat pipe positioning slot 271.

In this technical solution, the insulating skeleton 27 can also position the heat pipe 4 in the stator slot while realizing insulating isolation of the stator winding and the stator core 23. In accordance with the position of the first heat pipe positioning groove 231, it is preferable that the second heat pipe positioning groove 271 is also located at a center position of the radial length of the connection arm.

The cross sections of the first heat pipe positioning groove 231 and the second heat pipe positioning groove 271 are, for example, in a shape with a closed mouth, such as a dovetail shape, and the cross section of the heat pipe 4 is matched with the shape of the first heat pipe positioning groove 231 or the second heat pipe positioning groove 271, so that the heat pipe 4 can be reliably defined in the circumferential direction.

On any axial section of the stator core 23, the height of the portion of the heat pipe 4 protruding from the notch of the first heat pipe positioning groove 231 or the second heat pipe positioning groove 271 is H, and the thickness of the single-side winding of the stator winding is d, d/2 is less than or equal to H is less than or equal to d.

Therefore, the thickness of the evaporating section 43 of the heat pipe 4 and the thickness of the stator winding can be ensured to have a larger overlapping area, and the efficient transfer of the heat pipe 4 to the stator winding is further ensured.

In another preferred embodiment, a plurality of heat pipe end slots 223 are formed on the inner side surface of the end cover 22, and the ends of the heat pipes 4 are respectively inserted into the heat pipe end slots 223 in a one-to-one correspondence manner, so that the space between the condensation section 41 and the second cooling flow channel 221 is smaller, and the efficient heat transfer of the heat pipes 4 is ensured.

According to an embodiment of the present application, referring to fig. 11, the present application also provides a cooling oil cooling system of an air compressor, comprising:

the oil pump 100, the first oil cooler 101 and the air compressor described above, wherein the oil pump 100 is used for forming a driving cycle for cooling oil, the oil pump 100, the first oil cooler 101 are communicated with the oil inlet pipe 212 via a first pipeline, the oil return pipe 213 is communicated with the oil inlet 111 on the compressor housing 11 via a second pipeline, the oil outlet 112 on the compressor housing 11 is communicated with the oil pump 100 via a third pipeline, and the compressor housing 11 is internally provided with a corresponding press cooling flow passage, and two ends of the press cooling flow passage are respectively provided with the oil inlet 111 and the oil outlet 112 described above.

In the technical scheme, the cooling flow channels in the motor and the cooling flow channels in the compressor component are connected in series through the first oil cooler 101 to form a heat dissipation circulation flow path, so that the pipeline design of the air compressor is simplified, and the system construction cost is reduced.

In another embodiment, referring specifically to fig. 12, a second oil cooler 102 is connected in parallel to the first pipeline, and the second oil cooler 102 has a first state connected in series with the first oil cooler 101 and a second state bypassed by the first pipeline. Specifically, the motor housing 21 is provided with a temperature detecting component 103, which is used for detecting the real-time temperature in the motor housing 21, when the detected real-time temperature is higher than a set threshold value, the corresponding control component controls the second oil cooler 102 to be in a first state, so that the purpose of cooling and radiating the air compressor by the first oil cooler 101 and the second oil cooler 102 can be achieved at the same time, and when the detected real-time temperature is not higher than the set threshold value, the corresponding control component controls the second oil cooler 102 to be in a second state, and only the first oil cooler 101 is used for cooling and radiating the air compressor at the moment. Generally, the air compressor is in the first state for the second oil cooler 102 during heavy load operation, and in the second state for the second oil cooler 102 during light load operation. The switching between the first state and the second state may be achieved by providing on-off control of a corresponding solenoid valve on a pipeline communicating with the second oil cooler 102.

The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application. The foregoing is merely a preferred embodiment of the present application, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present application, and these modifications and variations should also be regarded as the scope of the application.

Claims (12)

1. An electric machine, comprising:

a motor housing (21), a second end of the motor housing (21) having an end cap (22), the end cap (22) having a second cooling flow passage (221) configured therein;

stator module, assemble in motor housing (21), including stator core (23), stator core (23) have a plurality of stator teeth, adjacent two form the stator groove between the stator tooth, each stator groove is equipped with heat pipe (4) in interpolation, stator core (23) are close to one side terminal surface of end cover (22) is first terminal surface, first terminal surface with the embedment has heat conduction spare (3) between end cover (22), heat conduction spare (3) parcel in stator winding stretch out in the periphery side of the end of first terminal surface, evaporation zone (43) of heat pipe (4) are in each stator inslot and with each stator inslot corresponds around the stator winding contact of establishing, condensation zone (41) of heat pipe (4) stretch out first terminal surface and by heat conduction spare (3) location parcel.

2. An electric machine according to claim 1, characterized in that,

a plurality of heat pipe end slots (223) are formed in the inner side surface of the end cover (22), and the ends of the heat pipes (4) are respectively inserted into the heat pipe end slots (223) in a one-to-one correspondence mode.

3. An electric machine according to claim 1, characterized in that,

the stator teeth comprise connecting arms connected with the yoke parts of the stator iron cores (23), first heat pipe positioning grooves (231) are formed in the side faces of the connecting arms, the first heat pipe positioning grooves (231) penetrate along the axial direction of the stator iron cores (23), and part of the heat pipes (4) are inserted into the first heat pipe positioning grooves (231).

4. The motor of claim 3, wherein the motor is configured to control the motor,

the first heat pipe positioning groove (231) is located at the center of the radial length of the connecting arm.

5. The motor of claim 3, wherein the motor is configured to control the motor,

the stator core (23) is further provided with an insulating framework (27), the insulating framework (27) is provided with a groove inner wall body which covers the groove vertical wall of the stator groove, a second heat pipe positioning groove (271) is formed in the position of the groove inner wall body and the position of the first heat pipe positioning groove (231), the second heat pipe positioning groove (271) is embedded in the first heat pipe positioning groove (231), and part of the heat pipe (4) is inserted in the second heat pipe positioning groove (271).

6. The motor of claim 5, wherein the motor is configured to control the motor,

on any axial section of the stator core (23), the height of the part of the heat pipe (4) protruding out of the notch of the first heat pipe positioning groove (231) or the second heat pipe positioning groove (271) is H, and the thickness of a single-side winding of the stator winding is d, and d/2 is more than or equal to H and less than or equal to d.

7. An electric machine according to claim 1, characterized in that,

the motor comprises a motor housing (21), wherein a first cooling flow passage (211) is formed in the motor housing (21), the first cooling flow passage (211) is used for cooling at least a stator core (23) in the motor housing (21), an oil inlet pipe (212) and an oil return pipe (213) are formed in the motor housing (21), an inlet of the first cooling flow passage (211) and an inlet of the second cooling flow passage (221) are connected together and in the oil inlet pipe (212), and an outlet of the first cooling flow passage (211) and an outlet of the second cooling flow passage (221) are connected together and in the oil return pipe (213).

8. The motor of claim 7, wherein the motor is configured to control the motor to drive the motor,

the first cooling flow passage (211) is provided with a plurality of axial flow passages extending along the axial direction of the motor housing (21) and a plurality of circumferential flow passages extending along the circumferential direction of the motor housing (21), and each circumferential flow passage is communicated and connected with the first end or the second end of two adjacent axial flow passages so that the first cooling flow passage (211) forms an S shape arranged around the central axis of the motor housing (21); and/or the second cooling flow channel (221) comprises a full-width cooling part and a half-width cooling part, and cooling oil flows through the oil inlet pipe (212), the full-width cooling part, the half-width cooling part and the oil return pipe (213) in sequence.

9. The motor of claim 8, wherein the motor is configured to control the motor,

the full-width cooling part comprises a plurality of first straight flow channels extending along a first direction and a plurality of second straight flow channels extending along a second direction, each second straight flow channel is connected with a first end or a second end of two adjacent first straight flow channels in a communicating way so that the full-width cooling part forms an S shape, the end cover (22) is provided with a central symmetry line parallel to the second direction, the half-width cooling part comprises a first cooling part positioned on the first side of the central symmetry line and a second cooling part positioned on the second side of the central symmetry line, a plurality of third straight flow channels extending along the first direction and a plurality of fourth straight flow channels extending along the second direction are arranged in the first cooling part and the second cooling part respectively, each fourth straight flow channel is connected with the first end or the second end of two adjacent third straight flow channels in a communicating way so that the half-width cooling part forms an S shape which is positioned on two sides of the central symmetry line and is communicated with each other, the first cooling part and the second cooling part are respectively provided with the first straight flow channels and the second straight flow channels corresponding to the first straight flow channels and the second straight flow channels respectively, and the first cooling part and the second straight flow channels are respectively arranged in the same direction, and the first straight flow channels are respectively.

10. An air compressor, comprising:

a compression assembly comprising a compressor housing (11);

the electric machine of any one of claims 1 to 9, the first end of the motor housing (21) being connected with the first end of the compressor housing (11).

11. A cooling oil cooling system of an air compressor, comprising:

the oil pump (100), the first oil cooler (101) and the air compressor according to claim 10, wherein the oil pump (100), the first oil cooler (101) are communicated with the oil inlet pipe (212) through a first pipeline, the oil return pipe (213) is communicated with the oil inlet (111) on the compressor housing (11) through a second pipeline, and the oil outlet (112) on the compressor housing (11) is communicated with the oil pump (100) through a third pipeline.

12. The cooling oil cooling system according to claim 11, wherein,

the first pipeline is connected with a second oil cooler (102) in parallel, and the second oil cooler (102) is provided with a first state connected with the first oil cooler (101) in series and a second state bypassed by the first pipeline.