CN219094695U

CN219094695U - Angle grinder with brushless motor sealing structure

Info

Publication number: CN219094695U
Application number: CN202320068276.8U
Authority: CN
Inventors: 姚定星
Original assignee: Yongkang Laipu Industry And Trade Co ltd
Current assignee: Yongkang Laipu Industry And Trade Co ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-05-30
Anticipated expiration: 2033-01-10

Abstract

The utility model provides an angle grinder with a brushless motor sealing structure, which comprises a machine body and a motor assembly arranged in an inner cavity of the machine body, wherein the motor assembly comprises a stator, a rotor and a wire frame piece, and a heat dissipation fan blade is arranged at the upper end of the rotor; the machine body is provided with a bearing seat in a suspending manner, the lower end of the wire frame component is provided with a first annular flange in an extending manner, and the first annular flange is correspondingly and hermetically inserted and abutted on the bearing seat; the lower ends of the radiating fan blades are provided with annular grooves, and the upper ends of the wire frame members are provided with second annular flanges in the annular grooves in an extending mode; the lower extreme and the bearing frame sealing connection of line frame spare, the upper end of line frame spare is located the annular groove of heat dissipation fan blade for the rotor between stator cladding bearing frame and the heat dissipation fan blade on the line frame spare, thereby prevented the iron foam to get into between stator and the rotor of motor, prolonged the life of motor.

Description

Angle grinder with brushless motor sealing structure

Technical Field

The utility model relates to the field of sealing, in particular to an angle grinder with a brushless motor sealing structure.

Background

The brushless motor angle grinder is widely circulated in the market, the brushless motor omits electric energy consumption and friction resistance generated by friction between a carbon brush and a copper head, so that the power output ratio of the brushless motor is improved by more than 20 percent relative to that of a traditional angle grinder, and a Chinese patent application number of CN201821930282.5 discloses an angle grinder, which comprises a shell, a grinding head fixed at the front end of the shell, a motor component arranged in the shell, a transmission system and a switch component exposed out of the shell, wherein the transmission system is arranged in the shell, the transmission system is linked with the motor component and the grinding head, the motor component drives the transmission system, the transmission system is linked with the grinding head to rotate, the switch component controls the motor component, a grabbing part is formed at the periphery of the shell and used for a user to grab, and the position design of the grabbing part ensures that the body of the angle grinder is good in stability and easy to use;

since the iron foam easily runs between the stator and the rotor of the motor, a short circuit is caused between the stator and the rotor, and the motor is damaged, but the patent fails to solve the problem. Therefore, we propose a structure that can seal the stator and the rotor directly, so that no iron foam can run in between the stator and the rotor, thereby protecting the motor from normal use.

Disclosure of Invention

First, the technical problem to be solved

The utility model aims to solve the problem of providing an angle grinder with a brushless motor sealing structure, so as to overcome the defects in the prior art.

(II) technical scheme

In order to solve the technical problems, the utility model provides an angle grinder with a brushless motor sealing structure, which comprises a machine body and a motor assembly arranged in an inner cavity of the machine body, wherein the motor assembly comprises a stator, a rotor and a wire frame piece, and a heat dissipation fan blade is arranged at the upper end of the rotor; the machine body is provided with a bearing seat in a suspending manner, the lower end of the wire frame component is provided with a first annular flange in an extending manner, and the first annular flange is correspondingly and hermetically inserted and abutted on the bearing seat; the lower ends of the radiating fan blades are provided with annular grooves, and the upper ends of the wire frame members are provided with second annular flanges in the annular grooves in an extending mode; the lower extreme and the bearing frame sealing connection of line frame spare, the upper end of line frame spare is located the annular groove of heat dissipation fan blade for the rotor between stator cladding bearing frame and the heat dissipation fan blade on the line frame spare, thereby prevented the iron foam to get into between stator and the rotor of motor, prolonged the life of motor.

Furthermore, the machine body is provided with a guide cover outside the heat dissipation fan blade, the guide cover is propped against the upper end face of the stator, and the guide cover guides the wind extracted by the heat dissipation fan blade.

Further, an annular inserting hole is formed in the first annular flange, an annular inserting flange matched with the annular inserting hole is arranged on the bearing seat, so that the bearing seat is in sealing connection with the lower wire frame, and iron foam is blocked by the lower wire frame and the bearing seat and cannot enter between the rotor and the stator.

Furthermore, a plurality of positioning clamping grooves are formed in the outer peripheral surface of the stator at equal intervals, limiting ribs which are in plug-in fit with the positioning clamping grooves are correspondingly arranged on the inner cavity, and the limiting ribs are matched with the positioning clamping grooves to prevent the stator from displacing.

Further, the wire frame assembly comprises an upper wire frame and a lower wire frame, the first annular flange is arranged at the lower end of the lower wire frame, the second annular flange is arranged at the upper end of the upper wire frame, the second annular flange at the upper end of the upper wire frame is positioned in the annular groove of the heat dissipation fan blade, and iron foam is prevented from entering between the rotor and the stator.

Further, a housing is mounted on the machine body, the upper end of the rotor is arranged in the housing through a bearing, and the lower end of the rotor is arranged in the bearing seat through a bearing.

Further, the machine body is provided with an air inlet, a plurality of through holes are formed between the bearing seat and the inner wall of the machine body as well as between the bearing seat and the air inlet, and the shell is provided with an air outlet.

Further, the rotor is connected to the grinding wheel via a gear transmission.

Further, a plurality of groups of coils are distributed in the coil frame, each adjacent coil is provided with a space, air entering from the air inlet is discharged from the air outlet after passing through the space on the stator, and the coils and the stator can be cooled by the air passing through the space, so that the motor can maintain a better working state, and the service life of the motor is prolonged.

Furthermore, the air inlet is communicated with the through hole, the interval and the air outlet, the upper wire frame and the lower wire frame are spliced on the stator to form an integral wire frame assembly, and the interval and the rotor are kept in a sealing state.

(III) beneficial effects

The utility model provides an angle grinder with a brushless motor sealing structure, which comprises a machine body, a frame, a first annular flange, a second annular flange, a third annular flange, a fourth annular flange, a fifth annular flange, a sixth annular flange and a fourth annular flange, wherein the machine body is provided with a bearing seat in a suspending manner; the lower end of the heat dissipation fan blade is provided with an annular groove, and the upper end of the wire frame member is provided with a second annular flange arranged in the annular groove in an extending manner; the lower extreme and the bearing frame sealing connection of line frame spare, the upper end of line frame spare is located the annular groove of heat dissipation fan blade for the rotor between stator cladding bearing frame and the heat dissipation fan blade on the line frame spare, thereby prevented the iron foam to get into between stator and the rotor of motor, prolonged the life of motor.

Drawings

FIG. 1 is a first perspective view of an angle grinder with a brushless motor seal structure according to the present utility model;

FIG. 2 is a schematic cross-sectional front view of an angle grinder with a brushless motor seal structure according to the present utility model;

FIG. 3 is a first partial cross-sectional schematic view of an angle grinder with a brushless motor seal structure according to the present utility model;

FIG. 4 is a second partial cross-sectional view of an angle grinder with a brushless motor seal structure according to the present utility model;

FIG. 5 is a schematic view of a bearing housing and through-hole structure of an angle grinder with a brushless motor sealing structure according to the present utility model;

FIG. 6 is a schematic view of ribs and plug flanges of an angle grinder with a brushless motor sealing structure according to the present utility model;

FIG. 7 is a schematic view showing the connection of a wire frame member and a bearing housing of an angle grinder with a brushless motor sealing structure according to the present utility model;

FIG. 8 is a schematic view of a stator structure of an angle grinder with a brushless motor sealing structure according to the present utility model;

FIG. 9 is an exploded view of a stator and bobbin assembly of an angle grinder with a brushless motor seal structure according to the present utility model;

FIG. 10 is a schematic view of a stator and bobbin assembly and coil of an angle grinder with a brushless motor seal structure according to the present utility model;

FIG. 11 is a schematic view of adjacent coil forming intervals of an angle grinder with a brushless motor seal structure according to the present utility model;

FIG. 12 is a schematic view of the spacing and through holes of an angle grinder with brushless motor seal structure according to the present utility model;

the corresponding component names for each reference number in the figures are: 1. a body; 2. an inner cavity; 3. a motor assembly; 4. a stator; 5. a rotor; 6. a wire holder; 7. radiating fan blades; 8. a bearing seat; 9. a first annular flange; 10. an annular groove; 11. a second annular flange; 12. a guide cover; 13. an annular plug hole; 14. a plug flange; 15. positioning clamping grooves; 16. limit ribs; 17. feeding a wire frame; 18. a wire laying frame; 19. a housing; 20. an air inlet; 21. a through hole; 22. an air outlet; 23. grinding wheel; 24. a coil; 25. spacing.

Detailed Description

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

Referring to fig. 1 to 12, the utility model provides an angle grinder with a brushless motor sealing structure, which comprises a machine body 1 and a motor assembly 3 arranged in an inner cavity 2 of the machine body 1, wherein the motor assembly 3 comprises a stator 4, a rotor 5 and a wire frame 6, and a heat dissipation fan blade 7 is arranged at the upper end of the rotor 5; the machine body 1 is provided with a bearing seat 8 in a suspending way, the lower end of the wire frame 6 is provided with a first annular flange 9 in an extending way, and the first annular flange 9 is correspondingly sealed and inserted and abutted against the bearing seat 8; the lower end of the radiating fan blade 7 is provided with an annular groove 10, and the upper end of the wire frame 6 is provided with a second annular flange 11 which is arranged in the annular groove 10 in an extending manner;

the air inlet 20 is communicated with the through hole 21, the interval 25 and the air outlet 22, the upper wire frame 17 and the lower wire frame 18 are spliced on the stator 4 to form an integral wire frame member 6, and the interval 25 and the rotor 5 are kept in a sealing state; the lower extreme and the bearing frame 8 sealing connection of line frame spare 6, the upper end of line frame spare 6 is located the annular groove 10 of heat dissipation fan blade 7 for the rotor 5 between stator 4 cladding bearing frame 8 and the heat dissipation fan blade 7 on the line frame spare 6, thereby prevented the iron foam to get into between stator 4 and the rotor 5 of motor, prolonged the life of motor.

Referring to fig. 2, a guide cover 12 is installed on the outer side of the heat dissipation fan blade 7 of the machine body 1, the guide cover 12 abuts against the upper end face of the stator 4, and the guide cover 12 guides wind extracted by the heat dissipation fan blade 7.

Referring to fig. 2 to 5, an annular insertion hole 13 is formed in the first annular flange 9, and an annular insertion flange 14 matched with the annular insertion hole 13 is arranged on the bearing seat 8, so that the bearing seat 8 is in sealing connection with the lower wire frame 18, and iron foam is blocked by the lower wire frame 18 and the bearing seat 8 and cannot enter between the rotor 5 and the stator 4.

Referring to fig. 5 and 8, a plurality of positioning clamping grooves 15 are formed in the outer peripheral surface of the stator 4 at equal intervals, limiting ribs 16 in plug-in fit with the positioning clamping grooves 15 are correspondingly arranged on the inner cavity 2, and the limiting ribs 16 are matched with the positioning clamping grooves 15 to prevent the stator 4 from displacing.

Referring to fig. 6 to 9, the bobbin assembly 6 includes an upper bobbin 17 and a lower bobbin 18, the first annular flange 9 is disposed at the lower end of the lower bobbin 18, the second annular flange 11 is disposed at the upper end of the upper bobbin 17, and the second annular flange 11 at the upper end of the upper bobbin 17 is disposed in the annular groove 10 of the cooling fan blade 7 to prevent iron foam from entering between the rotor 5 and the stator 4.

Referring to fig. 1 to 2, a housing 19 is mounted on a machine body 1, and a rotor 5 is disposed in the housing 19 at an upper end thereof via a bearing and in a bearing housing 8 at a lower end thereof via a bearing. The machine body 1 is provided with an air inlet 20, a plurality of through holes 21 are formed between the bearing seat 8 and the inner wall of the machine body 1 and among the air inlet 20, an air outlet 22 is arranged on the shell 19, and the rotor 5 is connected to a grinding wheel 23 through gear transmission.

Referring to fig. 10 to 12, a plurality of groups of coils 24 are distributed in the wire frame 6, a space 25 is formed between each two adjacent coils 24, air entering from the air inlet 20 is discharged from the through hole 21 through the space 25 on the stator 4 and then is discharged from the air outlet 22, and the air passing through the space 25 can cool the coils 24 and the stator 4, so that the motor can maintain a better working state, and the service life of the motor is prolonged.

When the angle grinder with the brushless motor sealing structure provided by the embodiment works, the rotor 5 in the motor drives the heat dissipation fan blade 7 to exhaust air from the air inlet 20, the extracted air is guided by the guide cover 12 through the interval 25 between the coils 24 on the stator 4 after passing through the through hole 21 at the bearing seat 8, and then is discharged from the air outlet, the air passing through the interval 25 cools the stator 4 and the coils 24, so that the motor keeps a good working state, the bearing seat 8 is in sealing connection with the lower end of the wire frame piece 6, the upper end of the wire frame piece 6 is positioned in the annular groove 10, iron foam in the inner cavity 2 cannot enter between the rotor 5 and the stator 4, and the service life of the motor is prolonged.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims

1. The angle grinder with the brushless motor sealing structure comprises a machine body (1) and a motor assembly (3) arranged in an inner cavity (2) of the machine body (1), wherein the motor assembly (3) comprises a stator (4), a rotor (5) and a wire frame (6), and a heat dissipation fan blade (7) is arranged at the upper end of the rotor (5); the method is characterized in that: the machine body (1) is provided with a bearing seat (8) in a suspended manner, the lower end of the wire frame (6) is provided with a first annular flange (9) in an extending manner, and the first annular flange (9) is correspondingly and hermetically inserted and abutted against the bearing seat (8); the lower end of the radiating fan blade (7) is provided with an annular groove (10), and the upper end of the wire frame (6) is provided with a second annular flange (11) which is arranged in the annular groove (10) in an extending mode.

2. An angle grinder with a brushless motor sealing structure as defined in claim 1, wherein: the machine body (1) is provided with a guide cover (12) at the outer side of the heat dissipation fan blade (7), and the guide cover (12) is propped against the upper end face of the stator (4).

3. An angle grinder with a brushless motor sealing structure as defined in claim 1, wherein: an annular inserting hole (13) is formed in the first annular flange (9), and an annular inserting flange (14) matched with the annular inserting hole (13) is arranged on the bearing seat (8).

4. An angle grinder with a brushless motor sealing structure as defined in claim 1, wherein: a plurality of positioning clamping grooves (15) are formed in the outer peripheral surface of the stator (4) at equal intervals, and limiting ribs (16) which are in plug-in fit with the positioning clamping grooves (15) are correspondingly arranged on the inner cavity (2).

5. An angle grinder with a brushless motor sealing structure as defined in claim 1, wherein: the wire frame assembly (6) comprises an upper wire frame (17) and a lower wire frame (18), the first annular flange (9) is arranged at the lower end of the lower wire frame (18), and the second annular flange (11) is arranged at the upper end of the upper wire frame (17).

6. An angle grinder with a brushless motor sealing structure as defined in claim 1, wherein: the machine body (1) is provided with a shell (19), the upper end of the rotor (5) is arranged in the shell (19) through a bearing, and the lower end of the rotor is arranged in the bearing seat (8) through a bearing.

7. An angle grinder with a brushless motor sealing structure as defined in claim 6, wherein: the machine body (1) is provided with an air inlet (20), a plurality of through holes (21) are formed between the bearing seat (8) and the inner wall of the machine body (1) and between the bearing seat and the air inlet (20), and an air outlet (22) is formed in the shell (19).

8. An angle grinder with a brushless motor sealing structure as defined in claim 1, wherein: the rotor (5) is connected to a grinding wheel (23) via a gear transmission.

9. An angle grinder with a brushless motor sealing structure as defined in claim 7, wherein: a plurality of groups of coils (24) are distributed in the wire frame (6), and a space (25) is formed between every two adjacent coils (24).

10. An angle grinder with a brushless motor sealing structure as defined in claim 9, wherein: the air inlet (20) is communicated with the through hole (21), the interval (25) and the air outlet (22).