CN219875313U

CN219875313U - Stator direct injection type oil cooling motor heat radiation structure and motor

Info

Publication number: CN219875313U
Application number: CN202321285468.0U
Authority: CN
Inventors: 刘正凯; 张小发; 苏岭; 赵林林; 李金树
Original assignee: China Changan Automobile Group Co ltd
Current assignee: China Changan Automobile Group Co ltd
Priority date: 2023-05-25
Filing date: 2023-05-25
Publication date: 2023-10-20
Anticipated expiration: 2033-05-25

Abstract

The utility model relates to the technical field of motors and provides a stator direct injection type oil cooling motor radiating structure and a motor, which comprise a motor shell, a stator iron core and stator windings, wherein the stator iron core is fixedly connected with the motor shell, an oil inlet and an oil outlet are arranged on the motor shell, a plurality of cooling oil grooves extending along the axial direction are arranged on the circumference of the stator iron core, the cooling oil grooves are blind grooves, scattering cavities are arranged on two end walls of the stator iron core, two axial end surfaces of the inner cavity of the blind grooves are in the same plane with the bottom surface of the axial groove of the scattering cavity, the two axial end surfaces of the inner cavity of the blind grooves are communicated with the bottom surface of the axial groove of the scattering cavity through injection holes, and the injection holes are positioned at the position of the blind grooves close to the center of a circle and the position of the scattering cavity close to the circumference and are used for injecting oil to the stator windings protruding towards the two axial ends of the stator to form the motor oil cooling radiating structure.

Description

Stator direct injection type oil cooling motor heat radiation structure and motor

Technical Field

The utility model relates to the technical field of motors, in particular to a stator direct injection type oil cooling motor radiating structure and a motor.

Background

With the development of the automobile industry, new energy automobiles enter a new development stage, the requirements of various large automobile manufacturers on the motor performance of the new energy automobiles are gradually improved, the motor cooling efficiency is directly related to the motor performance, and the oil cooling motor becomes the first choice of more automobile manufacturers due to the high cooling efficiency. At present, the main cooling structure of the oil-cooled motor stator and the winding thereof is that an oil injection ring or an oil injection pipe is arranged in the circumferential direction of the winding, and cooling oil is injected onto the motor winding along the oil injection ring or the oil injection pipe, so that the winding cooling is realized.

The patent application with publication number of CN113612322A discloses an oil cooling motor heat radiation structure and a motor, a plurality of laminations with oil spraying holes on the circumference are arranged at two ends of a stator, the oil spraying holes on the laminations form an oil spraying channel of an oblique winding in a rotating and staggered mode, and cooling oil is sprayed onto the winding from an oil duct on the circumference of the stator through the oil spraying channel, so that the purpose of cooling the winding is achieved. However, the iron core sheets required by the structure need to be designed with specific holes, and the two axial ends of the stator are formed into an oil injection channel through a plurality of iron core sheets which are rotationally staggered and stacked for a plurality of times so as to restrict the oil injection direction of the cooling oil to ensure the cooling effect of the stator winding, and the iron core sheets used at the two axial ends have complex structures and high production cost due to a plurality of iron core sheets; and the rotary staggered arrangement of the iron core sheets needs to be completed with multiple operations, so that the assembly difficulty is high, and even the oil injection channels can be blocked if the lamination assembly is misplaced, so that the cooling efficiency of the motor is affected. How to solve these problems needs a stator direct injection type oil cooling motor heat dissipation structure and a motor with low cost, simple structure and convenient assembly.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, provides a stator direct injection type oil cooling motor heat dissipation structure and a motor, and solves the problems of high cost, complex structure and difficult assembly of the direct injection type oil cooling motor.

The technical scheme of the utility model is as follows: the utility model provides a stator direct injection type oil cooling motor heat radiation structure, includes motor housing, stator core, stator winding, stator core and motor housing fixed connection, set up oil inlet, oil-out on the motor housing, a plurality of cooling oil grooves along axial extension are established to stator core circumference, cooling oil groove is blind groove, stator core's both ends wall is equipped with the scattering chamber, the both axial terminal surface of blind groove inner chamber is in the coplanar with the axial groove bottom surface of scattering chamber, the both axial terminal surface of blind groove inner chamber passes through jet orifice intercommunication with the axial groove bottom surface of scattering chamber, the jet orifice is located the position that the blind groove is close to the centre of a circle and the position that the scattering chamber is close to the circumference for to the convex stator winding oil spout of stator both ends, form motor oil cooling heat radiation structure.

The aperture of the jet hole is alpha, and the alpha is 0.5-2.5 mm.

The bottom of the blind groove is axially provided with a first diversion groove which is communicated with the spray hole.

The section of the first diversion trench is semicircular.

The diameter of the first diversion trench is the same as the diameter of the jet hole.

And a second diversion trench is arranged at the top of the scattering cavity and communicated with the spray hole.

The section of the second diversion trench is semicircular.

The diameter of the second diversion trench is the same as that of the jet hole.

And one side of the scattering cavity, which is close to the circle center, is positioned on the same circumference with the outer circumferential surface of the stator winding.

A motor comprises the stator direct injection type oil cooling motor radiating structure.

The technical scheme is adopted: the utility model provides a stator direct injection type oil cooling motor heat radiation structure, includes motor housing, stator core, stator winding, stator core and motor housing fixed connection, set up oil inlet, oil-out on the motor housing, a plurality of cooling oil grooves along axial extension are established to stator core circumference, cooling oil groove is blind groove, stator core's both ends wall is equipped with the scattering chamber, the both axial terminal surface of blind groove inner chamber is in the coplanar with the axial groove bottom surface of scattering chamber, the both axial terminal surface of blind groove inner chamber passes through jet orifice intercommunication with the axial groove bottom surface of scattering chamber, the jet orifice is located the position that the blind groove is close to the centre of a circle and the position that the scattering chamber is close to the circumference for to the convex stator winding oil spout of stator both ends, form motor oil cooling heat radiation structure. The blind groove is utilized to guide the cooling liquid, the scattering cavity is utilized to give way to the cooling liquid sprayed by the oblique circle center, the blind groove on the stator core is communicated with the scattering cavities at two ends of the stator core by utilizing the injection hole to form an injection channel, the cooling liquid is directly sprayed to the stator winding in the oblique circle center direction for cooling, and the cooling liquid in the motor finally flows out of the motor through the oil outlet 11, so that the aim of heat dissipation is achieved. The stator direct injection type oil cooling motor heat radiation structure is simple in structure, low in production cost, convenient to assemble and capable of effectively optimizing an assembly process.

The aperture of the jet hole is alpha, the aperture of the jet hole is 0.5-2.5 mm, the sectional area of the jet hole is far smaller than the sectional area of the blind groove, and the cooling liquid from the jet hole is ensured to be in a jet state.

The bottom of the blind groove is axially provided with a first diversion trench and communicated with the spray hole, the cross section of the first diversion trench is semicircular, the top of the scattering cavity is provided with a second diversion trench and communicated with the spray hole, and the cross section of the second diversion trench is semicircular. The diameters of the first diversion trench and the second diversion trench are the same as the diameter of the jet hole. The two diversion trenches are used for guiding the cooling liquid, so that the cooling liquid can be conveniently sprayed at the spraying hole.

One side of the scattering cavity, which is close to the circle center, is positioned on the same circumference with the outer circumferential surface of the stator winding, so that the structure of the two ends of the stator core can be simplified, and production materials can be saved.

According to the stator direct injection type oil cooling motor heat dissipation structure and the motor, a plurality of iron chips are not required to be arranged at two ends of a stator core, and cooling liquid can be directly sprayed onto a stator winding from the stator in the direction of the oblique circle center only by communicating the two axial end faces of the inner cavity of the blind groove with the axial groove bottom face of the scattering cavity through the spray hole and in the same plane, so that the purpose of cooling the winding is achieved.

The utility model is further described below with reference to the drawings and specific examples.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an enlarged view at FIG. 1A;

FIG. 3 is a cross-sectional view of FIG. 1A;

fig. 4 is a schematic structural view of a stator core according to the present utility model;

FIG. 5 is a schematic view of the first iron core plate of the present utility model;

FIG. 6 is an enlarged view at FIG. 5B;

FIG. 7 is a schematic diagram of a second iron core plate according to the present utility model;

FIG. 8 is an enlarged view at FIG. 7C;

fig. 9 is a left side view of the stator core of the present utility model;

FIG. 10 is an enlarged view at FIG. 9D;

fig. 11 is a schematic diagram of the operation of the present utility model.

Detailed Description

Referring to fig. 1 to 10, a stator direct injection type oil-cooled motor heat dissipation structure comprises a motor housing 1, a stator core 4 and a stator winding 5. The stator core 4 is fixedly connected with the motor shell 1, an oil inlet 10 and an oil outlet 11 are arranged on the motor shell 1, an annular groove is radially arranged on the inner circumferential surface of the motor shell 1, and the annular groove is communicated with the oil inlet 10. The stator core 4 circumference is established a plurality of evenly distributed's cooling oil groove along axial extension, the cooling oil groove is blind groove 6, the tank bottom axial of blind groove 6 sets up first guiding gutter 62, the cross-section of first guiding gutter 62 is semi-circular. The two end walls of the stator core 4 are provided with scattering cavities 9, the tops of the scattering cavities 9 are provided with second diversion trenches 93, and the cross section of each second diversion trench 93 is semicircular. The scattering cavities 9 are grooves with rectangular cross sections, the number of the grooves is consistent with that of the blind grooves, and the grooves are uniformly distributed on two end walls of the stator core 4; or the scattering chamber 9 is an annular groove around the stator winding. The scattering cavity 9 extends towards the center of the circle near one side 92 of the center of the circle and can be positioned on the same circumference with the outer circumference surface of the stator winding 5. The two axial end surfaces 61 of the inner cavity of the blind groove 6 and the axial groove bottom surface 91 of the scattering cavity 9 are positioned on the same plane, the two axial end surfaces 61 of the inner cavity of the blind groove 6 and the axial groove bottom surface 91 of the scattering cavity 9 are communicated through the injection hole 8, and the aperture of the injection hole 8 is alpha, and the alpha is 0.5-2.5 mm. The injection hole 8 is communicated with the first diversion trench 62 and the second diversion trench 93 and has the same diameter. The injection hole 8 is positioned at the position of the blind groove 6 close to the center of the circle and the position of the scattering cavity 9 close to the circumference, and is used for injecting oil to the stator windings 5 protruding towards the two axial ends of the stator, so as to form the motor oil cooling heat dissipation structure. A motor comprises the stator direct injection type oil cooling motor radiating structure.

The core pieces constituting the stator core 4 in this embodiment include a first core piece 41 provided in the middle and a second core piece 40 provided at both ends. The first core piece 41 and the second core piece 40 are circular rings with the same inner diameter and outer diameter. The outer circumference of the first iron core piece 41 is uniformly provided with a plurality of first grooves 411, a welding groove (not shown) is arranged between two adjacent first grooves 411, and the bottom of each first groove 411 is provided with a first semicircular groove 414 extending towards the center of the circle. The middle part of the stator core 4 is formed by laminating a plurality of first core plates 41, first grooves 411 on the plurality of first core plates 41 form cooling oil grooves axially extending on the circumference of the stator core 4, and first semicircular grooves 414 at the bottoms of the first grooves 411 form first diversion grooves 62. The outer circumference of the second iron core piece 40 is uniformly provided with first through holes 401, welding grooves are arranged between two adjacent first through holes 401, and the hole wall of the first through hole 401 far away from the circle center is provided with a second semicircular groove 404 extending outwards from the circle center. The second semicircular groove 404 has the same diameter as the first semicircular groove 414. The second core plates 40 assembled at the two ends of the stator core 4 are core plates with the same structural size, and the number of the second core plates can be one, or the number of the second core plates can be one, so that the second semicircular groove 404 and the first semicircular groove 414 are overlapped to form the injection hole 8, and the first through hole 401 forms the scattering cavity 9.

Referring to fig. 11, the working principle of the stator direct injection type oil cooling motor heat dissipation structure of this embodiment is as follows: the cooling liquid enters the motor from the oil inlet and flows to the end part of the blind groove 6, the cooling liquid in the blind groove 6 far away from the center is blocked by the axial end face 61, the dynamic pressure of the cooling liquid is converted into static pressure to form the pressure in the direction of the center, the cooling liquid in the blind groove 6 near the center has the pressure in the axial direction, because the two axial end faces 61 of the inner cavity of the blind groove 6 are communicated with the axial groove bottom face 91 of the scattering cavity 9 through the jet hole 8 and are positioned on the same plane, the cooling liquid is converged into resultant force of which the oblique center and the end wall angle of the stator core are theta when passing through the jet hole 8, the diameter of the jet hole 8 is smaller, the cooling liquid is scattered on the stator winding in a jet shape, and finally the cooling liquid flows out of the motor from the oil outlet 11 to take away heat, thereby achieving the purpose of cooling the stator winding, and a plurality of iron chips with complex structures are not needed to form oil injection channels with certain length at the two ends of the iron core so as to reduce the quantity or thickness of the iron chips at the two ends of the axial ends of the stator core, the stator core is simple in structure, and the production cost is reduced. In this embodiment, the distance from the bottom of the first diversion trench 62 to the motor housing is H ₁ The distance from the bottom of the second diversion trench 93 to the motor housing is H, and the included angle θ of the oblique resultant force formed by the coolant through the injection hole is H/H ₁ Is inversely related to the value of (c).

When the stator direct injection type oil-cooled motor heat dissipation structure is used, cooling liquid enters the motor from an oil inlet 10 on the motor housing 1, flows into blind grooves 6 on the circumference of a stator core 4 through annular grooves on the inner circumference surface of the motor housing 1, flows to two ends of the stator core 4 through the blind grooves 6, and is sprayed onto a stator winding through injection holes 8 when flowing to the end parts of the blind grooves 6, and finally flows out of the motor from an oil outlet 11 to take away heat, so that the aim of cooling the stator winding is fulfilled. The stator direct injection type oil cooling motor heat dissipation structure of the embodiment not only can cool the stator winding, but also can cool the motor shell and the stator core.

Compared with the prior art, the stator core disclosed by the utility model has a simple structure, the cooling purpose of the stator winding can be realized by only ensuring that the two axial end surfaces of the inner cavity of the blind slot are communicated with the axial slot bottom surface of the scattering cavity through the injection hole and are positioned on the same plane, and a plurality of core sheets with complex structures are not required to be arranged at the two end parts of the stator to form staggered injection channels for restraining cooling liquid, so that the production cost is saved, and the assembly difficulty is reduced due to the stator forming and assembly procedures.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the utility model, and those skilled in the art will appreciate that the modifications made to the utility model fall within the scope of the utility model without departing from the spirit of the utility model.

Claims

1. The utility model provides a stator direct injection type oil cooling motor heat radiation structure, includes motor housing (1), stator core (4), stator winding (5), stator core (4) and motor housing (1) fixed connection, set up oil inlet (10), oil-out (11) on motor housing (1), a plurality of cooling oil grooves along axial extension are established to stator core (4) circumference, its characterized in that: the cooling oil groove is blind groove (6), the both ends wall of stator core (4) is equipped with scattering chamber (9), the both ends face (61) in blind groove (6) inner chamber are in the coplanar with the axial groove bottom surface (91) of scattering chamber (9), the both ends face (61) in blind groove (6) inner chamber and the axial groove bottom surface (91) of scattering chamber (9) pass through jet orifice (8) intercommunication, jet orifice (8) are located the position that blind groove (6) is close to the centre of a circle and the position that scattering chamber (9) is close to the circumference for to stator both ends convex stator winding (5) oil spout, form motor oil cooling heat radiation structure.

2. The stator direct injection type oil-cooled motor heat dissipation structure of claim 1, wherein: the aperture of the jet hole (8) is alpha, and alpha is 0.5-2.5 mm.

3. The stator direct injection type oil-cooled motor heat dissipation structure of claim 1, wherein: the bottom of the blind groove (6) is axially provided with a first diversion groove (62) which is communicated with the injection hole (8).

4. The stator direct injection type oil-cooled motor heat dissipation structure as set forth in claim 3, wherein: the cross section of the first diversion trench (62) is semicircular.

5. The stator direct injection type oil-cooled motor heat dissipation structure according to claim 3 or 4, wherein: the diameter of the first diversion trench (62) is the same as the diameter of the jet hole (8).

6. The stator direct injection type oil-cooled motor heat dissipation structure of claim 1, wherein: the top of the scattering cavity (9) is provided with a second diversion trench (93) which is communicated with the injection hole (8).

7. The stator direct injection type oil-cooled motor heat dissipation structure of claim 6, wherein: the section of the second diversion trench (93) is semicircular.

8. The stator direct injection type oil-cooled motor heat dissipation structure according to claim 6 or 7, characterized in that: the diameter of the second diversion trench (93) is the same as the diameter of the jet hole (8).

9. The stator direct injection type oil-cooled motor heat dissipation structure of claim 1, wherein: the side (92) of the scattering cavity (9) close to the circle center is positioned on the same circumference with the outer circumference of the stator winding (5).

10. An electric motor, characterized in that: a heat dissipation structure comprising the stator direct injection type oil-cooled motor of claim 1.