CN216774455U

CN216774455U - Sealed dustproof brushless motor for angle grinder

Info

Publication number: CN216774455U
Application number: CN202122858593.3U
Authority: CN
Inventors: 冯利民
Original assignee: Zhejiang Boke Motor Co ltd
Current assignee: Zhejiang Boke Motor Co ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-06-17
Anticipated expiration: 2031-11-19

Abstract

The utility model relates to the field of machinery, in particular to a brushless motor. A sealed dustproof brushless motor for an angle grinder comprises a brushless motor body, wherein the brushless motor body comprises a motor shaft, a rotor core is arranged on the motor shaft, a stator core is arranged on the outer side of the rotor core, a fan blade mounting seat is arranged on the upper portion of the motor shaft, the fan blade mounting seat comprises a fixed pipe and a fixed piece, and fan blades are arranged on the fixed piece; be equipped with first gap between rotor core and the stator core, the top in first gap is equipped with the dust cover. Through the design, the utility model provides the sealed dustproof brushless motor for the angle grinder, the sealing effect of the motor is improved, and when the angle grinder is used, the motor fault caused by the fact that generated magnetic attraction substances such as scrap iron, iron powder and the like enter a gap between a rotor and a stator of the motor is avoided; meanwhile, the heat dissipation effect of the motor is improved, heat generated inside the motor can be smoothly conducted, the motor is prevented from being damaged due to overheating, and the service life of the motor is prolonged.

Description

A sealed dustproof brushless motor for angle mill

Technical Field

The utility model relates to the field of machinery, in particular to a brushless motor.

Background

The angle mill is polished and is cut by the metal that extensively used has magnetism nature such as steel and iron to inhale by electric motor rotor's magnet steel, and then adsorb on electric motor rotor, and constantly accumulation easily causes the gap between electric motor rotor and the stator to be filled up, leads to metal powder and electric motor rotor and stator to produce contact friction, causes the card to die, and simultaneously, the friction also can produce the heat fast, leads to the motor to burn out.

Brushless motors used by angle grinders in the market at present generally adopt a full-sealing structure or a semi-open structure, but the brushless motors with the full-sealing structure prevent metal powder from entering the motors, but reduce the heat dissipation effect of the motors; the brushless motor with the semi-open structure ensures the heat dissipation effect, but can not effectively prevent metal powder from entering the motor.

An effective solution to the problems in the related art has not been proposed yet.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sealed dustproof brushless motor for an angle grinder, so as to solve at least one technical problem.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a sealed dustproof brushless motor for an angle grinder comprises a brushless motor body, wherein the brushless motor body comprises a motor shaft, a rotor core is arranged on the motor shaft, and a stator core is arranged on the outer side of the rotor core;

the fan blade is arranged on the outer side of the first annular bulge, and the first annular bulge is arranged on the outer side of the second annular bulge;

a first gap is formed between the rotor core and the stator core, a dust cover is arranged above the first gap, and a mounting hole for allowing the dust cover to penetrate through the fixing pipe is formed in the middle of the dust cover;

the upper part of the dust cover is provided with a first annular groove matched with the first annular bulge and a second annular groove matched with the second annular bulge, and the depth of the second annular groove is not less than that of the first annular groove;

the motor shaft is characterized in that a tubular sealing structure is arranged below the first gap, the lower portion of the motor shaft is connected with the sealing structure through a first bearing, a sealing cover is arranged on the lower portion in the sealing structure, and the sealing cover is arranged below the motor shaft.

The fixed pipe and the fixed sheet are of an integrated structure, and the fixed sheet and the fan blade are of an integrated structure.

The fixed pipe, the fixed sheet and the fan blade are all made of metal.

The lower end face of the fixed pipe and the upper end face of the rotor core are provided with a second gap, the lower portion of the inner wall of the fixed pipe and a third gap are arranged between the motor shafts, and heat-conducting silica gel is filled in the second gap and the third gap.

The stator core is provided with a slot sleeve for winding, the slot sleeve is provided with a slot wedge which is vertically arranged, the lower portion of the dust cover is provided with a first annular embedded groove, a first sealing ring is arranged in the first embedded groove, the upper end of the slot wedge supports the first sealing ring, the upper portion of the sealing structure is provided with a second annular embedded groove, a second sealing ring is arranged in the second embedded groove, and the lower end of the slot wedge supports the second sealing ring.

At least one is annular third embedded groove on seal structure's the inner wall, be equipped with in the third embedded groove and be used for absorbing rubber circle, the rubber circle sets up the outside of first bearing.

Through the design, the utility model provides the sealed dustproof brushless motor for the angle grinder, the structure is simple, the operation is stable, the sealing effect of the motor is improved through the matching work of the fan blade mounting seat, the dustproof cover, the sealing structure and other components, and the motor fault caused by the fact that generated magnetic attraction substances such as scrap iron, iron powder and the like enter a gap between a rotor and a stator of the motor is avoided when the angle grinder is used; meanwhile, the heat dissipation effect of the motor is improved, heat generated inside the motor can be smoothly conducted, the motor is prevented from being damaged due to overheating, and the service life of the motor is prolonged.

Drawings

FIG. 1 is a schematic view of a portion of the present invention;

FIG. 2 is a schematic longitudinal sectional view of a portion of the structure of the present invention;

fig. 3 is a cross-sectional view of a portion of the structure of the present invention.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1 to 3, a sealed dustproof brushless motor for an angle grinder comprises a brushless motor body, the brushless motor body comprises a motor shaft 1, a rotor core 15 is arranged on the motor shaft 1, a stator core 5 is arranged on the outer side of the rotor core 15, a fan blade mounting seat is arranged on the upper portion of the motor shaft 1, the fan blade mounting seat comprises a fixed pipe 18 for penetrating through the motor shaft 1, a circular fixing plate 2, the fixed pipe 18 is arranged above the rotor core 15, the fixing plate 2 is arranged on the outer side of the upper portion of the fixed pipe 18, and at least three fan blades 3 which are arranged at equal intervals are arranged on the outer side portion of the fixing plate 2; the fixing piece 2 is provided with a first annular bulge and a second annular bulge, the fan blade 3 is arranged on the outer side of the first annular bulge, and the first annular bulge is arranged on the outer side of the second annular bulge; a first gap is formed between the rotor core 15 and the stator core 5, a dust cover 4 is arranged above the first gap, and a mounting hole for penetrating through the fixing pipe 18 is formed in the middle of the dust cover 4; the upper part of the dust cover 4 is provided with a first annular groove matched with the first annular bulge and a second annular groove matched with the second annular bulge, and the depth of the second annular groove is not less than that of the first annular groove; a sealing structure 6 in a circular tube shape is arranged below the first gap, the lower part of the motor shaft 1 is connected with the sealing structure 6 through a first bearing 13, a sealing cover 11 is arranged at the lower part in the sealing structure 6, and the sealing cover 11 is arranged below the motor shaft 1. Through the design, the utility model provides the sealed dustproof brushless motor for the angle grinder, the structure is simple, the operation is stable, the sealing effect of the motor is improved through the matching work of the fan blade mounting seat, the dustproof cover 4, the sealing structure and other components, and the motor fault caused by the fact that generated magnetic attraction substances such as scrap iron, iron powder and the like enter a gap between a rotor and a stator of the motor is avoided when the angle grinder is used; meanwhile, the heat dissipation effect of the motor is improved, heat generated inside the motor can be smoothly conducted, the motor is prevented from being damaged due to overheating, and the service life of the motor is prolonged.

In the design, a first annular bulge with a circular cross section and a second annular bulge with a circular cross section are arranged on the fan blade mounting seat, the first annular bulge is arranged on the outer side of the second annular bulge and is arranged in a concentric circle manner, so that the first annular bulge and the second annular bulge are matched and arranged on a first annular groove and a second annular groove on the dust cover 4 to form a double-sealing structure, magnetic absorption substances such as scrap iron and iron powder are prevented from entering a gap between a motor rotor and a motor stator, the depth of the second annular groove is not less than that of the first annular groove, and the sealing effect on the gap between the motor rotor and the motor stator is further improved; the lower part of a gap between the motor rotor and the stator is sealed through structures such as a sealing structure 6 and a sealing cover 11, so that the brushless motor body has a better sealing structure and keeps a good heat dissipation effect, and the sealing structure 6 can be matched with the whole machine shell of the angle grinder to be integrally arranged.

In order to ensure the structural strength of the fan blade mounting seat, the fixing pipe 18 and the fixing piece 2 are of an integrated structure, and the fixing piece 2 and the fan blade 3 are of an integrated structure.

The fixed pipe 18, the fixed sheet 2 and the fan blade 3 are all made of metal. Be equipped with second gap 16 between the lower terminal surface of fixed pipe 18 and the up end of rotor core 15, the internal diameter of fixed pipe 18 lower part is greater than the internal diameter on fixed pipe 18 upper portion, is equipped with third gap 17 between the lower part of fixed pipe 18 inner wall and motor shaft 1, all fills in second gap 16 and the third gap 17 has heat conduction silica gel. The fan blade mount pad rotates along with motor shaft 1 for fan blade 3 is to the heat dissipation of blowing of brushless motor body outside, and simultaneously, fixed pipe 18, stationary blade 2 all adopt the metal that the heat conductivity is good to make with fan blade 3, and cooperation heat conduction silica gel dispels the heat with the heat conduction of electric motor rotor inside to fan blade 3, has improved the radiating effect, and then has improved the result of use of motor.

The upper part of the motor shaft 1 is provided with a second bearing 19. The second bearing 19 is used in conjunction with the angle grinder housing to facilitate the mounting of the brushless motor body. In order to ensure the using effect of the brushless motor body, a balance ring 10 is arranged on the lower part of the motor shaft 1, and the balance ring 10 is arranged on the inner side of the upper part of the sealing structure.

Rotor core's the outside is equipped with magnet steel 14, magnet steel 14's the outside is equipped with and is annular magnetic steel bushing 21, be equipped with on stator core 5 and be used for wire-wound chute cover 20, chute cover 20 department is equipped with and is vertical slot wedge 8 of arranging, the lower part of dust cover 4 is equipped with and is annular first embedded groove, be equipped with first sealing washer 7 in the first embedded groove, first sealing washer 7 is supported to the upper end of slot wedge 8, seal structure 6's upper portion is equipped with and is annular second embedded groove, be equipped with second sealing washer 9 in the second embedded groove, the lower tip of slot wedge 8 supports second sealing washer 9. So as to increase the sealing effect on the gap between the motor rotor and the stator through the first sealing ring 7 and the second sealing ring 9.

At least one is annular third embedded groove on seal structure 6's the inner wall, is equipped with in the third embedded groove and is used for absorbing rubber circle 12, and rubber circle 12 sets up the outside at first bearing 13. The number of the third embedded grooves is two, and the two third embedded grooves are distributed on the inner wall of the sealing structure 6 in an upper row and a lower row. Through the closing cap 11, the phenomenon that iron chips, iron powder and other magnetic absorption materials enter a gap between a motor rotor and a motor stator through the sealing structure to cause motor faults is avoided.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the utility model as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealed dustproof brushless motor for an angle grinder comprises a brushless motor body, wherein the brushless motor body comprises a motor shaft, a rotor core is arranged on the motor shaft, and a stator core is arranged on the outer side of the rotor core;

a first annular groove matched with the first annular protrusion and a second annular groove matched with the second annular protrusion are formed in the upper portion of the dustproof cover, and the depth of the second annular groove is not smaller than that of the first annular groove;

2. The sealed dustproof brushless motor for the angle grinder of claim 1, wherein the fixed tube and the fixed plate are of an integrated structure, and the fixed plate and the fan blade are of an integrated structure.

3. The sealed dustproof brushless motor for the angle grinder of claim 2, wherein the fixed tube, the fixed plate and the fan blade are made of metal.

4. The sealed dustproof brushless motor for the angle grinder of claim 1 or 3, wherein a second gap is provided between the lower end surface of the fixed tube and the upper end surface of the rotor core, a third gap is provided between the lower portion of the inner wall of the fixed tube and the motor shaft, and both the second gap and the third gap are filled with heat-conducting silica gel.

5. The brushless motor of claim 1, wherein the stator core has a slot cover for winding, the slot cover has vertically arranged slot wedges, the lower portion of the dust cover has an annular first insertion slot, the first insertion slot has a first seal ring, the upper end of the slot wedge abuts against the first seal ring, the upper portion of the sealing structure has an annular second insertion slot, the second insertion slot has a second seal ring, and the lower end of the slot wedge abuts against the second seal ring.

6. The sealed dustproof brushless motor for the angle grinder of claim 1, wherein the inner wall of the sealing structure is provided with at least one annular third embedded groove, a rubber ring for shock absorption is arranged in the third embedded groove, and the rubber ring is arranged outside the first bearing.