CN112751449B

CN112751449B - Cooling structure of oil-cooled permanent magnet motor for vehicle

Info

Publication number: CN112751449B
Application number: CN202011565600.4A
Authority: CN
Inventors: 陈世军; 张琪; 申玉斌; 查长礼; 王陈宁
Original assignee: Anqing Normal University; University of Shanghai for Science and Technology
Current assignee: Anqing Normal University; University of Shanghai for Science and Technology
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2022-02-11
Anticipated expiration: 2040-12-25
Also published as: CN112751449A

Abstract

The invention discloses a cooling structure of an oil-cooled permanent magnet motor for a vehicle, which comprises a casing, wherein an oil storage part is arranged on the casing, symmetrically distributed oil injection parts are arranged in the casing, a stator is arranged in the casing, a cooling groove is arranged on the stator, and a winding is arranged on the stator; the shell comprises a shell body, an oil groove is arranged in the shell body, an oil guide groove is obliquely arranged in the shell body, and an oil storage groove is communicated with the oil guide groove; the oil injection piece comprises a fixing piece, a fixing ring is fixed on the fixing piece, and a threaded hole is formed in the fixing ring. The cooling structure efficiently cools the motor through winding spray type cooling and stator oil duct type cooling, the winding positioned below the rotor is immersed in cooling liquid, so that the stator winding is fully cooled, compared with the traditional water-cooling heat dissipation, the cooling structure has the advantages of greatly improving the cooling effect, improving the power density of the motor, prolonging the service life of the motor, adjusting the height of an oil nozzle, enabling the oil film formed by cooling oil on the end part of the winding to be the thickest and having good heat dissipation effect.

Description

Cooling structure of oil-cooled permanent magnet motor for vehicle

Technical Field

The invention relates to a cooling structure, in particular to a cooling structure of a permanent magnet motor for an oil-cooled vehicle.

Background

The permanent magnet motor for the new energy automobile has increasingly strict requirements on the power density of the motor, the existing multi-purpose shell water cooling mode of the permanent magnet motor for the automobile is used for cooling the motor, and the cooling mode needs the heat source in the motor to be transferred to the outside through layer-by-layer materials and then taken away by a water channel. The motor windings cannot be directly cooled, so that temperature accumulation is caused, and particularly, the motor end windings cannot be in contact with a water channel of a machine shell, so that the temperature is too high. A direct cooling heat source is required to improve cooling efficiency.

The oil cooling heat dissipation mode is mainly selected because the dielectric constant of oil is high, the oil is not magnetic, the insulating property is better, and the heat dissipation efficiency is good. Therefore, a direct oil cooling mode can be adopted, and the cooling efficiency of the motor is greatly improved.

Disclosure of Invention

The invention aims to provide a cooling structure of an oil-cooled permanent magnet motor for a vehicle, which is characterized in that an oil transfer pump is started, cooling liquid enters an oil tank from an oil transfer pipe, part of the cooling liquid enters a communicating pipe through a second through hole and a second oil inlet hole and then is sprayed onto a winding through an oil nozzle to cool the winding, the cooling liquid naturally falls into an oil guide groove, the other part of the cooling liquid enters a cooling groove and an oil groove through a first through hole and a first oil inlet hole to cool a stator and the winding, and the part of the cooling liquid flows into the oil guide groove along the gravity of the cooling groove and the oil groove; the cooling liquid in the oil guide groove is guided to the oil storage groove through the inclined plane, the oil pump pumps the cooling liquid out through the oil outlet pipe to complete circulation, during assembly, the fixing ring is rotated upwards according to the size of the winding to enable the fixing ring to be separated from the limiting block, the limiting block is popped out under the action of the elastic piece, the heights of the adjusting piece and the oil spray nozzle are adjusted to prevent interference in installation of the winding, the fixing ring is screwed downwards to enable the fixing ring to be pressed tightly against the limiting block, and the adjusting piece is fixed through matching and limiting of the fixing block and the fixing groove; the cooling structure cools the motor efficiently through winding immersion cooling and stator oil duct type cooling, and the cooling capacity of transferring heat of the air gap of traditional stator core and casing direct contact has great improvement, and the cooling effect is good, extension motor life, and the fuel sprayer height is adjustable, makes the oil film that the coolant oil formed on the winding tip thickest, and the radiating effect is good.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an oil cooling type is cooling structure of automobile-used permanent-magnet machine, cooling structure includes the casing, be equipped with the oil storage piece on the casing, be equipped with the oil spout piece of symmetric distribution in the casing, be equipped with the stator in the casing, be equipped with the cooling bath on the stator, be equipped with the winding on the stator.

The casing includes the casing, is equipped with the oil groove in the casing, and the slope is equipped with leads the oil groove in the casing, leads the intercommunication on the oil groove and is equipped with the oil storage tank.

The oil injection piece comprises a fixing piece, a fixing ring is arranged on the fixing piece, a threaded hole is formed in the fixing ring, an adjusting piece is arranged below the fixing piece in a sliding mode, elastic pieces are arranged on two sides of the fixing piece, and an oil injection nozzle is arranged below the adjusting piece.

Furthermore, a rotor is arranged in the stator in a rotating mode, a rotating shaft is fixedly connected to the rotor, a front end cover is arranged on the casing, a rear end cover is arranged on the casing, the rotating shaft is rotatably connected with the front end cover, and the rotating shaft is rotatably connected with the rear end cover.

Further, the oil groove surrounds in the outside of stator, and the intercommunication is equipped with first inlet port on the oil groove, is equipped with the second inlet port of symmetric distribution on the casing, and the oil storage tank top is equipped with out oil pipe, goes out oil pipe and the inside intercommunication of casing, goes out oil pipe and flushes with the winding of rotor below, goes out oil pipe and passes rear end cap and oil-well pump intercommunication, cooling bath and oil groove intercommunication, and rear end cap and front end cap all are connected with the casing fastening, stator and casing fastening.

Further, the oil storage part comprises an oil tank, an oil conveying pipe is arranged on the oil tank in a communicated mode, a first through hole is formed in the lower portion of the oil tank in a communicated mode, second through holes which are symmetrically distributed are formed in the lower portion of the oil tank in a communicated mode, the first through hole is communicated with a first oil inlet hole, the oil tank is fixedly connected with the shell, and the oil conveying pipe is communicated with an oil conveying pump.

Further, the mounting is equipped with the screwed pipe including fixed pipe on the fixed pipe, is equipped with the recess on the fixed pipe, is equipped with the fixed column in the recess, rotates on the fixed column to be equipped with the stopper, is equipped with the fixed block on the stopper, is equipped with the spout on the fixed pipe, and the intercommunication is equipped with the spacing groove on the spout.

Further, screw hole and screwed pipe screw-thread fit are with mounting and solid fixed ring fastening connection, gu fixed ring and fixed pipe sliding connection, the one end and the recess inner wall fastening connection of elastic component, the other end and stopper fastening connection, fixed pipe and second inlet port intercommunication, fixed pipe and casing fastening connection.

Further, the regulating part includes communicating pipe, is equipped with spacing post on communicating pipe, is equipped with the fixed slot on the spacing post, and the regulating part passes through communicating pipe and spout cooperation and mounting sliding connection, spacing post and spacing groove cooperation, fixed block and fixed slot cooperation, fuel sprayer and communicating pipe screw-thread fit.

The invention has the beneficial effects that:

1. the cooling structure efficiently cools the motor through winding spray type cooling and stator oil duct type cooling, and the winding below the rotor is immersed in cooling liquid, so that the stator winding is fully cooled;

2. the height of the oil nozzle is adjustable, so that an oil film formed by cooling oil on the end part of the winding is the thickest, and the heat dissipation effect is good;

3. the specific oil channels are arranged on the outer surfaces of the shell and the stator simultaneously, so that the stator is cooled more fully, and the heat dissipation effect is better than that of the traditional shell and the outer surface of the stator in air contact.

Drawings

The invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a cooling structure of the present invention;

FIG. 2 is an enlarged view of the structure of FIG. 1 at A according to the present invention;

FIG. 3 is a schematic view of the structure of the oil injection member of the present invention;

FIG. 4 is a partial structural view of the oil injection member of the present invention;

FIG. 5 is a partial structural schematic diagram of the oil injection member of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model provides an automobile-used permanent magnet motor's of oil cooling formula cooling structure, cooling structure includes casing 1, as shown in figure 2, be equipped with oil storage 2 on the casing 1, be equipped with symmetric distribution's oil spout piece 3 in the casing 1, be equipped with stator 4 in the casing 1, be equipped with cooling bath 41 on the stator 4, be equipped with winding 5 on the

stator

4, 4 internal rotations of stator are equipped with rotor 6, rotor 6 fastening has pivot 7, be equipped with front end housing 8 on the casing 1, be equipped with rear end housing 9 on the casing 1, pivot 7 rotates with front end housing 8 to be connected, pivot 7 rotates with rear end housing 9 to be connected.

Casing 1 includes casing 11, as shown in fig. 1, fig. 2, be equipped with oil groove 12 in the casing 11, oil groove 12 surrounds in the outside of stator 4, the intercommunication is equipped with first inlet port 13 on the oil groove 12, be equipped with symmetric distribution's second inlet port 14 on the casing 11, slope is equipped with in the casing 11 and leads oil groove 15, it is equipped with oil storage tank 16 to lead the intercommunication on the oil groove 15, the top of oil storage tank 16 is equipped with out oil pipe 17, go out oil pipe 17 and the inside intercommunication of casing 11, it flushes with winding 5 of rotor 6 below to go out oil pipe 17, it passes rear end cap 9 and oil-well pump intercommunication to go out oil pipe 17, cooling bath 41 and oil groove 12 intercommunication, rear end cap 9 and front end cap 8 all are connected with casing 11 fastening, stator 4 and casing 11 fastening connection.

The oil storage part 2 comprises an oil tank 21, as shown in fig. 1 and 2, an oil delivery pipe 22 is communicated with the oil tank 21, a first through hole 23 is communicated with the lower part of the oil tank 21, second through holes 24 which are symmetrically distributed are communicated with the lower part of the oil tank 21, the first through hole 23 is communicated with the first oil inlet 13, the oil tank 21 is fixedly connected with the shell 11, and the oil delivery pipe 22 is communicated with the oil delivery pump.

The oil injection piece 3 comprises a fixing piece 31, as shown in fig. 3 and 4, a fixing ring 32 is arranged on the fixing piece 31, a threaded hole is formed in the fixing ring 32, an adjusting piece 33 is arranged below the fixing piece 31 in a sliding mode, elastic pieces 34 are arranged on two sides of the fixing piece 31, and an oil injection nozzle 35 is arranged below the adjusting piece 33.

Fixing piece 31 includes fixed pipe 311, as shown in fig. 4 and 5, be equipped with screwed pipe 312 on the fixed pipe 311, be equipped with recess 313 on the fixed pipe 311, be equipped with fixed column 314 in the recess 313, it is equipped with stopper 315 to rotate on the fixed column 314, be equipped with fixed block 316 on the stopper 315, be equipped with spout 317 on the fixed pipe 311, the intercommunication is equipped with spacing groove 318 on the spout 317, screw hole and screwed pipe 312 screw-thread fit are with fixing piece 31 and fixed ring 32 fastening connection, fixed ring 32 and fixed pipe 311 sliding connection, the one end and the recess 313 inner wall fastening connection of elastic component 34, the other end and stopper 315 fastening connection, fixed pipe 311 and second inlet port 14 intercommunication, fixed pipe 311 and casing 11 fastening connection.

Adjusting part 33 includes communicating pipe 331, as shown in fig. 3, communicating pipe 331 is provided with limiting column 332, limiting column 332 is provided with fixing groove 333, adjusting part 33 is in sliding connection with fixing member 31 through cooperation of communicating pipe 331 and sliding groove 317, limiting column 332 is in cooperation with limiting groove 318, fixing block 316 is in cooperation with fixing groove 333, and oil nozzle 35 is in threaded fit with communicating pipe 331.

When the cooling device is used, the oil delivery pump is started, the cooling liquid enters the oil tank 21 from the oil delivery pipe 22, part of the cooling liquid enters the communicating pipe 331 through the second through hole 24 and the second oil inlet hole 14, and then is sprayed onto the winding 5 through the oil spray nozzle 35 to cool the winding 5, the cooling liquid naturally falls into the oil guide groove 15, the other part of the cooling liquid enters the cooling groove 41 and the oil groove 12 through the first through hole 23 and the first oil inlet hole 13 to cool the stator 4 and the winding 5, and the part of the cooling liquid flows into the oil guide groove 15 along the gravity of the cooling groove 41 and the oil groove 12; the coolant liquid in the oil guide groove 15 is guided to the oil storage groove 16 through the inclined plane, the coolant liquid converges at the bottom of the machine shell 1 until the winding 5 on the lower side of the rotor 6 is immersed, the oil well pump takes out the coolant liquid through the oil outlet pipe 17 to complete circulation, during assembly, according to the size of the winding 5, the fixing ring 32 is upwards rotated to separate the fixing ring 32 from the limiting block 315, under the action of the elastic part 34, the limiting block 315 is popped out, the height of the adjusting part 33 and the height of the oil nozzle 35 are adjusted, the winding 5 is prevented from being interfered, the fixing ring 32 is downwards screwed to compress the limiting block 315, and the adjusting part 33 is fixed through the matching of the fixing block 316 and the fixing groove. The cooling structure efficiently cools the motor through winding immersion type cooling and stator oil duct type cooling, has greatly improved heat transfer cooling capacity compared with the traditional air gap in which the stator iron core is directly contacted with the shell, has good cooling effect, prolongs the service life of the motor, can adjust the height of the oil nozzle, and ensures that the oil film formed on the end part of the winding by the cooling oil is thickest and has good heat dissipation effect.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer 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.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. A cooling structure of an oil-cooled permanent magnet motor for a vehicle comprises a casing (1), and is characterized in that an oil storage part (2) is arranged on the casing (1), symmetrically distributed oil injection parts (3) are arranged in the casing (1), a stator (4) is arranged in the casing (1), a cooling groove (41) is arranged on the stator (4), and a winding (5) is arranged on the stator (4);

the shell (1) comprises a shell (11), an oil groove (12) is arranged in the shell (11), an oil guide groove (15) is obliquely arranged in the shell (11), and an oil storage groove (16) is communicated on the oil guide groove (15);

the oil injection part (3) comprises a fixing part (31), a fixing ring (32) is arranged on the fixing part (31), a threaded hole is formed in the fixing ring (32), an adjusting part (33) is arranged below the fixing part (31) in a sliding mode, elastic parts (34) are arranged on two sides of the fixing part (31), and an oil injection nozzle (35) is arranged below the adjusting part (33);

the fixing piece (31) comprises a fixing pipe (311), a groove (313) is formed in the fixing pipe (311), a fixing column (314) is arranged in the groove (313), a limiting block (315) is rotatably arranged on the fixing column (314), and a fixing block (316) is arranged on the limiting block (315);

the adjusting piece (33) comprises a communicating pipe (331), a limiting column (332) is arranged on the communicating pipe (331), a fixing groove (333) is arranged on the limiting column (332), and the fixing block (316) is matched with the fixing groove (333).

2. The cooling structure of an oil-cooled permanent magnet motor for vehicles according to claim 1, wherein the stator (4) is rotatably provided with a rotor (6), the rotor (6) is fixedly connected with a rotating shaft (7), the casing (1) is provided with a front end cover (8), the casing (1) is provided with a rear end cover (9), the rotating shaft (7) is rotatably connected with the front end cover (8), and the rotating shaft (7) is rotatably connected with the rear end cover (9).

3. The cooling structure of the oil-cooled permanent magnet motor for the vehicle according to claim 2, wherein the oil groove (12) surrounds the outside of the stator (4), the oil groove (12) is provided with a first oil inlet hole (13) in a communicating manner, the housing (11) is provided with a second oil inlet hole (14) which are symmetrically distributed, the oil storage groove (16) is provided with an oil outlet pipe (17) above, the oil outlet pipe (17) is flush with the winding (5) below the rotor (6), the oil outlet pipe (17) is communicated with the inside of the housing (11), the oil outlet pipe (17) passes through the rear end cover (9) to be communicated with the oil pump, the cooling groove (41) is communicated with the oil groove (12), the rear end cover (9) and the front end cover (8) are both fastened and connected with the housing (11), and the stator (4) is fastened and connected with the housing (11).

4. The cooling structure of the oil-cooled permanent magnet motor for the vehicle according to claim 3, wherein the oil storage member (2) comprises an oil tank (21), an oil delivery pipe (22) is communicated with the oil tank (21), a first through hole (23) is communicated with the lower portion of the oil tank (21), second through holes (24) are communicated with the lower portion of the oil tank (21) and are symmetrically distributed, the first through hole (23) is communicated with the first oil inlet hole (13), the oil tank (21) is fastened and connected with the housing (11), and the oil delivery pipe (22) is communicated with the oil delivery pump.

5. The cooling structure of the oil-cooled permanent magnet motor for the vehicle according to claim 3, wherein the fixing tube (311) is provided with a threaded tube (312), the fixing tube (311) is provided with a sliding groove (317), and the sliding groove (317) is communicated with a limiting groove (318).

6. The cooling structure of the oil-cooled permanent magnet motor for the vehicle according to claim 5, wherein the threaded hole is in threaded engagement with a threaded pipe (312) to fixedly connect the fixing member (31) with the fixing ring (32), the fixing ring (32) is slidably connected with a fixing pipe (311), one end of the elastic member (34) is fixedly connected with the inner wall of the groove (313), the other end of the elastic member is fixedly connected with the limiting block (315), the fixing pipe (311) is communicated with the second oil inlet hole (14), and the fixing pipe (311) is fixedly connected with the housing (11).

7. The cooling structure of the oil-cooled permanent magnet motor for vehicles according to claim 5, wherein the adjusting member (33) is slidably connected to the fixing member (31) through the engagement of the communicating pipe (331) and the sliding groove (317), the limit post (332) is engaged with the limit groove (318), and the oil nozzle (35) is threadedly engaged with the communicating pipe (331).