CN116470690A

CN116470690A - Two-stage internal air-cooled motor structure

Info

Publication number: CN116470690A
Application number: CN202310402949.3A
Authority: CN
Inventors: 郭希龙
Original assignee: Xuzhou Meibang Electric Vehicle Technology Co ltd
Current assignee: Xuzhou Meibang Electric Vehicle Technology Co ltd
Priority date: 2023-04-17
Filing date: 2023-04-17
Publication date: 2023-07-21
Anticipated expiration: 2043-04-17
Also published as: CN116470690B

Abstract

The invention discloses a two-stage internal air-cooled motor structure, and belongs to the technical field of electric vehicles. One end of the motor rotating shaft is connected with a fan, and the other end of the motor rotating shaft is an output shaft; the four corners of the motor shell are respectively provided with an axial air duct penetrating through the motor shell; a fan shell is arranged outside the fan, and the inner space of the fan shell is communicated with the axial air duct; the axial air duct is internally provided with two-stage heat dissipation air pipes in a sliding manner, one ends of the 4 two-stage heat dissipation air pipes, which are far away from the fan, are commonly connected with annular heat dissipation discs, and the annular heat dissipation discs are positioned on the outer side of the circumferential surface of the output shaft; a positioning device is connected between the annular heat dissipation disc and the end face of the motor shell, and the distance between the annular heat dissipation disc and the end face of the motor shell is adjusted through the positioning device. The invention designs the secondary heat dissipation air pipe which can axially extend, and the secondary heat dissipation air pipe can extend outwards after the output shaft is connected with the external transmission mechanism, so that the installation space is utilized, and the heat dissipation area of the motor is increased.

Description

Two-stage internal air-cooled motor structure

Technical Field

The invention relates to the technical field of electric vehicles, in particular to a two-stage internal air-cooled motor structure.

Background

As the weight borne by the electric tricycle in the process of logistics dragging the transport vehicle is increased, the vehicle needs a novel power system with higher power, and a key motor and a driver of the power system. With the increase of new energy electric tricycles in the market, the common practice in the market is to improve the power of a motor, and the motor is matched with larger current to improve the power. Although power is improved, the load of the motor of the electric tricycle is increased, the temperature is raised too fast, the service life of internal parts is easily lost, the circuit is easily aged, and the service life is reduced. Therefore, the electric tricycle motor needs to be matched to a more efficient heat dissipation system.

Chinese patent discloses a fan enclosed motor cooling structure (CN 216530978U) comprising: the motor comprises a fan, a stator, a rotor, a front end cover, a rear end cover, a front bearing, a rear bearing, a rotating shaft and a motor shell, wherein the stator surrounds the rotor to generate an electromagnetic field so as to enable the rotor to rotate; the rotating shaft rotates through a front bearing and a rear bearing which are respectively connected with the front end cover and the rear end cover; the rotor drives the rotating shaft to rotate on the rotating shaft; an inner cold runner is arranged at the inner wall of the motor shell, and air flows through the inner cold runner to absorb heat; the stator and the rotor are provided with sealing structures, so that the operation performance of the stator and the rotor is not influenced by external air, dust and other foreign matters.

The defects of the prior art are as follows: according to the technical scheme, an inner cold runner is formed in the inner wall of a motor shell, air flows through the inner cold runner to absorb heat, and heat dissipation efficiency is related to the section of the inner cold runner on the inner wall; when the motor power increases, the radial dimension of the motor housing needs to be increased to improve the heat dissipation efficiency, and then the motor needs to be installed in a larger installation space.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a two-stage internal air-cooled motor structure. The two-stage inner air-cooled motor structure axially expands the heat dissipation structure, and improves the heat dissipation area and heat dissipation efficiency of the motor shell by utilizing the space at the connecting shaft of the motor.

The invention adopts the following technical scheme: a two-stage internal air-cooled motor structure comprises a motor shell, wherein a stator, a rotor and a motor rotating shaft are arranged in the motor shell, one end of the motor rotating shaft is connected with a fan, and the other end of the motor rotating shaft is an output shaft; the four corners of the motor shell are respectively provided with an axial air duct penetrating through the motor shell; a fan shell is arranged outside the fan, the inner space of the fan shell is communicated with the axial air duct, and an air inlet filter screen is arranged on the fan shell; the axial air duct is internally provided with two secondary heat dissipation air pipes in a sliding manner, one ends of the 4 secondary heat dissipation air pipes, which are far away from the fan, are commonly connected with annular heat dissipation discs, and the annular heat dissipation discs are positioned on the outer side of the circumferential surface of the output shaft; and a positioning device is connected between the annular cooling disc and the end face of the motor shell, and the distance between the annular cooling disc and the end face of the motor shell is adjusted through the positioning device.

It is further: the secondary heat dissipation air pipe comprises a pipe body, and a plurality of guide fins are arranged on the periphery of the pipe body; the inner wall of the axial air duct is provided with a plurality of convex guide rails, and the guide fins are in sliding fit with the guide rails.

The guide fins are totally provided with 4 guide fins, every two guide fins are in a group, and the two guide fins in each group are clamped at two sides of the guide rail.

The annular heat dissipation disc is provided with a horn-shaped air port at the butt joint position with the tube body, and the surface of the annular heat dissipation disc is provided with heat dissipation strips.

And 4 guide air channels which are in one-to-one correspondence with the axial air channels are arranged in the fan shell.

The outer side of the axial air duct is provided with vertical radiating fins, inclined radiating fins and horizontal radiating fins which are arranged around the axial air duct.

The two positioning devices are symmetrically arranged; the positioning device comprises a pair of elastic strips fixed on the annular radiating disc and an axial chute arranged on the side wall of the motor shell; racks are fixed on two side walls in the sliding groove, the two elastic strips are respectively pressed towards the racks on the corresponding sides, and inclined teeth matched with the racks are arranged on one side, close to the racks, of the end parts of the elastic strips.

The annular radiating disc is fixedly provided with a stud, and the elastic strips are fixed on two sides of the stud through bolts.

One side of the end part of the elastic strip, which is far away from the rack, is provided with a pressing piece, and a gap is reserved between the pressing pieces of the two elastic strips.

The invention has the beneficial effects that:

the four corners of the motor shell are provided with axial air channels, a secondary heat dissipation air pipe is slidably arranged in the axial air channels, the secondary heat dissipation air pipe and the axial air channels form a double-layer air channel, and the secondary heat dissipation air pipe can also extend in the axial direction, so that the heat dissipation efficiency and the heat dissipation area are increased, the radial size of the motor and the required installation space are not basically increased, and the later installation of the motor is facilitated;

the output shaft of the motor needs to be connected with an external transmission mechanism, so that the periphery of the output shaft needs to be reserved with a mounting space, and after the external transmission mechanism is connected, the space around the output shaft is wasted; the scheme designs the secondary heat dissipation air pipe which can axially extend, and after the output shaft is connected with the external transmission mechanism, the secondary heat dissipation air pipe can extend outwards, so that the installation space is utilized, the heat dissipation area of the motor is increased, and the technical effect of two purposes is achieved;

the positioning device adopts a symmetrical elastic strip structure, and a chute is arranged on the side wall of the motor shell, so that the radial size of the motor is reduced as much as possible; the output shaft of the motor is connected with an external transmission mechanism, the annular radiating disc and the secondary radiating air pipe can be directly pulled to adjust positions, positioning is achieved through the engagement of the helical teeth on the elastic strip and the racks in the sliding grooves, and the adjusting process is simple and convenient.

Drawings

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

Fig. 1 is a front view of a two-stage internal air cooled motor structure according to the present invention.

Fig. 2 is a view from A-A in fig. 1.

Fig. 3 is an enlarged view at B in fig. 2.

Fig. 4 is an enlarged view at C in fig. 1.

Fig. 5 is a left side view of a two-stage internal air cooled motor structure according to the present invention.

Fig. 6 is an enlarged view at D in fig. 5.

Reference numerals illustrate: 1. a motor housing; 101. a chute; 2. a fan; 3. an output shaft; 4. an axial air duct; 401. a guide rail; 402. vertical heat dissipation fins; 403. inclined radiating fins; 404. horizontal heat dissipation fins; 5. a fan housing; 501. a diversion air duct; 6. an air inlet filter screen; 7. a secondary heat dissipation air pipe; 701. a tube body; 702. a guide fin; 8. an annular heat dissipation plate; 801. a horn-shaped tuyere; 802. a heat dissipation strip; 9. an elastic strip; 10. a rack; 1001. helical teeth; 1002. tabletting; 11. a stud.

Detailed Description

The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, a two-stage internal air-cooled motor structure is shown, and a stator, a rotor and a motor shaft are installed in a motor housing 1. One end of the motor rotating shaft is connected with a fan 2, and the other end of the motor rotating shaft is an output shaft 3.

Referring again to fig. 2 and 3, the motor housing 1 has a rectangular overall structure with a cylindrical mounting cavity in the middle. The four corners of the motor shell 1 are respectively provided with an axial air duct 4 penetrating through the motor shell 1, and a secondary heat dissipation air duct 7 is slidably arranged in the axial air duct 4. The secondary heat radiation air pipe 7 comprises a pipe body 701, and a plurality of guide fins 702 are arranged on the periphery of the pipe body 701; in this embodiment, the guide fins 702 are provided in a total of 4, and are generally "X" shaped. The inner wall of the axial air duct 4 is provided with a plurality of protruding guide rails 401. Every two guide fins 702 are arranged into a group, and the two guide fins 702 in each group are clamped at two sides of the guide track 401; guide fins 702 are in sliding engagement with guide rails 401. The guide fin 702 and the guide rail 401 have not only a guiding function but also a heat radiation function. When the temperature of the guide fins 702 and the guide track 401 is increased, the guide fins 702 are clamped tightly, so that good heat conduction and heat dissipation effects are achieved. In addition, the outside of the axial air duct 4 is provided with a vertical heat radiation fin 402, an inclined heat radiation fin 403, and a horizontal heat radiation fin 404 arranged around the axial air duct 4. The heat dissipation fins are used for improving the heat dissipation effect of the motor housing 1, so that the motor housing 1 is square overall, and the installation stability is improved.

And in combination with fig. 4, one ends of the 4 secondary heat dissipation air pipes 7, which are far away from the fan 2, are commonly connected with an annular heat dissipation disc 8. The annular heat dissipation disc 8 is positioned at the outer side of the circumferential surface of the output shaft 3 and connects the 4 secondary heat dissipation air pipes 7 into a whole. The horn-shaped air port 801 is formed in the position, in butt joint with the pipe body 701, of the annular heat dissipation disc 8, the air output is improved, and the heat dissipation strips 802 are arranged on the surface of the annular heat dissipation disc 8, so that the heat dissipation effect is improved.

As shown in fig. 1, 5 and 6, the fan 2 is covered with a fan housing 5, and the fan housing 5 is fixed to the left end of the motor housing 1 by bolts. An air inlet filter screen 6 is arranged in the middle of the fan housing 5, and 4 diversion air channels 501 which are in one-to-one correspondence with the axial air channels 4 are arranged in the inner space of the four corners of the fan housing 5. After the fan 2 is started, external air enters the fan housing 5 through the air inlet filter screen 6 and then enters the four axial air channels 4 of the motor housing 1 through the 4 diversion air channels 501.

As shown in fig. 1 and 4, a positioning device is connected between the annular cooling disc 8 and the end face of the motor housing 1, and the distance between the annular cooling disc 8 and the end face of the motor housing 1 is adjusted by the positioning device. Two positioning devices are symmetrically arranged, and one side is taken as an example: the positioning device comprises an axial chute 101 arranged on the side wall of the motor shell 1, and racks 10 are fixed on the two side walls of the chute 101; the annular radiating disc 8 is fixedly provided with a stud 11, and the two elastic strips 9 are symmetrically fixed on two sides of the stud 11 through bolts; the two elastic strips 9 are respectively pressed against the racks 10 on the corresponding sides, and the side, close to the racks 10, of the left ends of the elastic strips 9 is provided with inclined teeth 1001 matched with the racks 10; the left end of the elastic strip 9 is provided with a pressing piece 1002 at the side far away from the rack 10, and a gap is reserved between the pressing pieces 1002 of the two elastic strips 9. In a free state, the helical teeth 1001 on the two elastic strips 9 are respectively pressed against the racks 10 on the corresponding sides, so that positioning is realized; when adjustment is needed, the pressing pieces 1002 at the left end parts of the two elastic strips 9 are pressed, so that the inclined teeth 1001 on the elastic strips 9 are separated from the racks 10, and at the moment, the annular radiating disc 8 and the secondary radiating air pipes 7 can be pulled out outwards.

Working principle:

after the motor housing 1 is fixed, the output shaft 3 and an external transmission mechanism are connected; then, the positioning device is operated to squeeze the pressing pieces 1002 at the left end parts of the two elastic strips 9, so that the inclined teeth 1001 on the elastic strips 9 are separated from the racks 10, and at the moment, the annular heat dissipation disc 8 and the secondary heat dissipation air pipes 7 can be pulled outwards, so that the annular heat dissipation disc 8 is positioned at the periphery of the output shaft 3, and the space outside the output shaft 3 is utilized for heat dissipation;

after the motor is started, the fan 2 starts to rotate, and outside air enters the fan housing 5 through the air inlet filter screen 6 and then enters the four axial air channels 4 of the motor housing 1 through the 4 diversion air channels 501; the air flow passes through the center hole of the secondary heat dissipation air pipe 7, the gap between the secondary heat dissipation air pipe 7 and the axial air duct 4 and the annular heat dissipation disc 8 to dissipate heat of the motor shell 1;

the scheme of the invention designs the secondary heat dissipation air pipe which can axially extend, and the secondary heat dissipation air pipe can extend outwards after the output shaft is connected with the external transmission mechanism, so that the installation space is utilized, and the heat dissipation area of the motor is increased.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims

1. The two-stage internal air-cooled motor structure comprises a motor shell (1), wherein a stator, a rotor and a motor rotating shaft are arranged in the motor shell (1), one end of the motor rotating shaft is connected with a fan (2), and the other end of the motor rotating shaft is an output shaft (3); the method is characterized in that: the four corners of the motor shell (1) are respectively provided with an axial air duct (4) penetrating through the motor shell (1); a fan shell (5) is arranged outside the fan (2), the inner space of the fan shell (5) is communicated with the axial air duct (4), and an air inlet filter screen (6) is arranged on the fan shell (5); a secondary heat dissipation air pipe (7) is slidably arranged in the axial air duct (4), one ends of the 4 secondary heat dissipation air pipes (7) far away from the fan (2) are connected with annular heat dissipation discs (8) together, and the annular heat dissipation discs (8) are positioned on the outer side of the circumferential surface of the output shaft (3); a positioning device is connected between the annular cooling disc (8) and the end face of the motor housing (1), and the distance between the annular cooling disc (8) and the end face of the motor housing (1) is adjusted through the positioning device.

2. The two-stage internal air-cooled motor structure of claim 1, wherein: the secondary heat dissipation air pipe (7) comprises a pipe body (701), and a plurality of guide fins (702) are arranged on the periphery of the pipe body (701); the inner wall of the axial air duct (4) is provided with a plurality of protruding guide rails (401), and the guide fins (702) are in sliding fit with the guide rails (401).

3. The two-stage internal air-cooled motor structure of claim 2, wherein: the guide fins (702) are provided with 4 guide fins, every two guide fins (702) are in a group, and the two guide fins (702) in each group are clamped on two sides of the guide track (401).

4. The two-stage internal air-cooled motor structure of claim 2, wherein: horn-shaped air openings (801) are formed in the positions, in butt joint with the pipe bodies (701), of the annular radiating discs (8), and radiating strips (802) are arranged on the surfaces of the annular radiating discs (8).

5. The two-stage internal air-cooled motor structure of claim 1, wherein: 4 guide air channels (501) which are in one-to-one correspondence with the axial air channels (4) are arranged in the fan shell (5).

6. The two-stage internal air-cooled motor structure of claim 1, wherein: the outside of axial wind channel (4) is provided with vertical heat dissipation wing (402), slope heat dissipation wing (403) and horizontal heat dissipation wing (404) that are arranged around axial wind channel (4).

7. The two-stage internal air-cooled motor structure of claim 1, wherein: the two positioning devices are symmetrically arranged; the positioning device comprises a pair of elastic strips (9) fixed on the annular radiating disc (8) and an axial sliding groove (101) arranged on the side wall of the motor shell (1); the two side walls of the sliding groove (101) are fixedly provided with racks (10), the two elastic strips (9) are respectively pressed against the racks (10) on the corresponding sides, and one side, close to the racks (10), of the end part of each elastic strip (9) is provided with inclined teeth (1001) matched with the racks (10).

8. The two-stage internal air-cooled motor structure of claim 7, wherein: the annular radiating disc (8) is fixedly provided with a stud (11), and the elastic strips (9) are fixed on two sides of the stud (11) through bolts.

9. The two-stage internal air-cooled motor structure of claim 7, wherein: one side of the end part of the elastic strip (9) far away from the rack (10) is provided with a pressing piece (1002), and a gap is reserved between the pressing pieces (1002) of the two elastic strips (9).