CN214755843U

CN214755843U - Outer rotor dustproof structure

Info

Publication number: CN214755843U
Application number: CN202120956086.0U
Authority: CN
Inventors: 金超群; 叶文标; 方啸炯
Original assignee: Zhejiang Roshow Electromechanical Co ltd
Current assignee: Zhejiang Roshow Electromechanical Co ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2021-11-16
Anticipated expiration: 2031-05-07

Abstract

The utility model relates to an external rotor dustproof construction. The existing outer rotor brushless motor has poor dustproof effect, and if large particles or other foreign matters enter the motor, the large particles or other foreign matters exist between the stator and the rotor, so that the motor is blocked, locked and even burnt. The utility model discloses a fore-stock, its characterized in that the both ends of fore-stock set up antifriction bearing and bearing respectively, antifriction bearing and bearing in wear to establish the pivot, be located the pivot of bearing outer end and set up the cooling fan blade, cooling fan blade and fore-stock form first labyrinth type structure together, the cooling fan blade in the iron-clad of impressing, iron-clad and fore-stock between form the second and say labyrinth type structure. The utility model designs a labyrinth structure between the front bracket and the iron shell and between the front bracket and the cooling fan blade. Effectively reduces dust, particles and other impurities entering the motor, thereby prolonging the service life of the motor.

Description

Outer rotor dustproof structure

Technical Field

The utility model relates to an external rotor brushless motor's institutional advancement especially relates to an external rotor dustproof construction.

Background

The existing outer rotor brushless motor consists of a stator, a rotor, a front support, a front bearing and a rear bearing, is generally applied to grass trimmers, mowers and hair dryers in garden tools, and is difficult to prevent dust, particles, grass scraps and other sundries from entering the interior of the motor and contacting the bearing in the working process, so that the service life of the bearing is influenced; meanwhile, if large particles or other foreign matters enter the motor, the particles or other foreign matters exist between the stator and the rotor, so that the motor is blocked, locked and even burnt.

SUMMERY OF THE UTILITY MODEL

The utility model discloses shortcoming to prior art exists provides an external rotor dustproof construction, has reduced the inside and external contact range of motor to reach dirt-proof purpose.

Therefore, the utility model adopts the following technical proposal: the outer rotor dustproof structure comprises a front support and is characterized in that two ends of the front support are respectively provided with a rolling bearing and a needle roller bearing, a rotating shaft penetrates through the rolling bearing and the needle roller bearing, a cooling fan blade is arranged on the rotating shaft at the outer end of the needle roller bearing, the cooling fan blade and the front support form a first labyrinth structure, the cooling fan blade is pressed into an iron shell, and a second labyrinth structure is formed between the iron shell and the front support.

The front bracket forms turning blocking surfaces at two sides, and the turning blocking surfaces abut against the outer side wall of the iron shell to form sealing.

The cooling fan blade forms an inner concave part on the inner end surfaces of two sides of the central main body, and a blocking surface inserted into the inner concave part is formed on the front support.

A stator core is arranged in the iron shell, a coil is wound outside the stator core, and a front support of the pressed bearing is pressed into the stator core wound with the coil through a tool.

The utility model designs a labyrinth structure between the front bracket and the iron shell and between the front bracket and the cooling fan blade. Dust, particles and other impurities entering the motor are effectively reduced, and the service life of the motor is prolonged; the phenomena of jamming and burning caused by foreign matters between the stator and the rotor are effectively avoided, and the potential safety hazard caused by burning is reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged schematic view of part a of the present invention.

Fig. 3 is an enlarged schematic view of part B of the present invention.

Detailed Description

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

As shown in fig. 1, the outer rotor dustproof structure includes a shaft 1, a rolling bearing 2, a front bracket 3, an iron case 4, a magnet 5, a stator core 6, a coil 7, a cooling fan blade 8, a needle bearing 9, and a mounting panel 10.

The two ends of the front support are respectively provided with a rolling bearing and a needle bearing, a rotating shaft penetrates through the rolling bearing and the needle bearing, a cooling fan blade is arranged on the rotating shaft positioned at the outer end of the needle bearing, the cooling fan blade and the front support form a first labyrinth structure, the cooling fan blade is pressed into an iron shell, and a second labyrinth structure is formed between the iron shell and the front support.

As shown in fig. 2, the front bracket forms on both sides a turn-up surface 11, which abuts against the outer side wall of the iron casing to form a seal.

As shown in fig. 3, the cooling fan blade forms an inner concave portion 12 on the inner end surface of both sides of the central main body, and a stop surface 13 inserted into the inner concave portion is formed on the front bracket.

The utility model discloses the assembling process as follows: respectively pressing a rolling bearing 2 and a needle bearing 9 into a front bracket 3 by using a tool, winding a coil 7 on a stator core 6 by using a winding machine, and pressing the front bracket 3 with the pressed bearing into the stator core 6 with the wound coil by using the tool to complete a stator part; after the inner ring of the iron shell 4 is glued, the cooling fan blade 8 is pressed into the iron shell by a tool, after the magnet is glued and baked, the shaft 1 is pressed into the cooling fan blade 8 by the tool, and after the balance, the rotor part is completed; and finally, pressing the rotor into the stator by utilizing a tool, and finishing the motor assembly.

The utility model discloses a motor is at the operation in-process, and stator part fore-stock 3 is fixed, and during the rotor was rotatory, the air current was centrifugal direction, in addition labyrinth type structure has reduced the inside and external contact range of motor to reach dirt-proof purpose

A labyrinth structure is added between the front bracket 3 and the iron shell 4, so that dust and other foreign matters are prevented from directly contacting with the winding, the magnet and the iron core; the front support 3 and the cooling fan blade 8 are provided with labyrinth structures, so that dust and other foreign matters are prevented from directly contacting the bearing.

The above description is only an example of the preferred embodiment of the present invention, and is not intended to limit the present invention. 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. The outer rotor dustproof structure comprises a front support and is characterized in that two ends of the front support are respectively provided with a rolling bearing and a needle roller bearing, a rotating shaft penetrates through the rolling bearing and the needle roller bearing, a cooling fan blade is arranged on the rotating shaft at the outer end of the needle roller bearing, the cooling fan blade and the front support form a first labyrinth structure, the cooling fan blade is pressed into an iron shell, and a second labyrinth structure is formed between the iron shell and the front support.

2. The external rotor dustproof structure of claim 1, wherein the front bracket forms a stopper surface at both sides, and the stopper surface abuts against an outer sidewall of the iron case to form a seal.

3. The dustproof structure of the outer rotor of claim 1 or 2, wherein the cooling blades have concave portions formed on inner end surfaces of both sides of the central body, and the front bracket has a blocking surface inserted into the concave portions.

4. The dustproof structure of the external rotor of claim 3, wherein a stator core is disposed in the iron case, a coil is wound outside the stator core, and the front bracket of the pressed bearing is pressed into the coil-wound stator core through a tool.