CN217984728U

CN217984728U - Permanent magnet brushless electric tool

Info

Publication number: CN217984728U
Application number: CN202222107203.3U
Authority: CN
Inventors: 王金城; 周富爱; 叶宸
Original assignee: Zhejiang Crown Electric Tools Manufacture Co ltd
Current assignee: Zhejiang Crown Electric Tools Manufacture Co ltd
Priority date: 2022-08-11
Filing date: 2022-08-11
Publication date: 2022-12-06
Anticipated expiration: 2032-08-11

Abstract

The utility model discloses a permanent magnet brushless electric tool, which comprises a shell, a permanent magnet motor with an output shaft, a reduction box in transmission connection with a permanent magnet motor body through the output shaft, and a rear shell arranged at the rear part of the shell, wherein the rear shell is provided with an air inlet for ventilation and an air inlet component arranged at the air inlet; the air inlet assembly is provided with a dust collecting piece for adsorbing metal dust and an air inlet cover for accommodating the dust collecting piece. The embodiment of the utility model discloses a compare in the scheme of having published now, directly block the metal dust outside the machine, prevent that the dust from getting into inside, do not need the extra isolating device of permanent-magnet machine, it prevents that the metal dust is not by adsorption effect when guaranteeing permanent-magnet machine, has avoided the adverse effect that brings the permanent-magnet machine heat dissipation again, structurally also more simple, effective, reliable, also make things convenient for daily dust to clear up simultaneously.

Description

Permanent magnet brushless electric tool

Technical Field

The utility model relates to an electric tool makes technical field.

Background

Compared with the traditional brush motor, the permanent magnet brushless motor has the characteristics of no carbon brush dust, no spark, low noise, no abrasion, high working efficiency, long service life and the like, solves the problem that the traditional electric tool is troubled and cannot be broken through for a long time, and is more and more concerned and accepted by manufacturers and consumers.

Permanent magnet brushless motor structure mainly by the stator of band winding, it constitutes to inlay the rotor that has the permanent magnet, the structure is reliable with preparation simple process, nevertheless have strong magnetism because of on the rotor, in the in-service use, in the operation environment that has production metal dust and granule, can adsorb some if contain iron, cobalt, metal dust such as nickel and granule on rotor excircle surface, after long-term the use air gap jam between the stator and the rotor, cause the unable operation of rotor, the final damage or burn out the motor, motor actual life has been reduced, this problem has seriously hindered the application development of this type of motor on electric tool product.

At present, the common scheme is that the motor is totally closed, the metal is prevented from entering the motor and being adsorbed, the problem of adsorption can be solved, but after the motor is sealed, heat generated in the operation of the motor cannot be effectively dissipated, and finally, the motor is overheated, so that magnetic steel demagnetization or burn and the motor is damaged too early, and therefore the problem is solved in an urgent need of a more reasonable and effective scheme. And in prior art, the mode of solving this problem sets up magnet in vent department when the opening to adsorb the inside metal dust that gets into the motor, but this mode can lead to the iron powder to adsorb on magnet, plugs up vent department, and hardly clears up. In addition, some prior art use the mode of electro-magnet to solve above-mentioned problem, but the components and parts physique of electro-magnet itself is very big, and very occupation of space, the price of part is also very expensive, is not suitable for electric tool to the clearance also has the problem, and the electro-magnet generally sets up inside the motor, and when metal dust peeled off from the electro-magnet surface, can directly fall inside the motor, can cause the problem that motor life reduces equally.

Disclosure of Invention

In order to solve the problem, the utility model provides a permanent magnet brushless electric tool.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a permanent magnet brushless power tool comprising:

a housing;

the permanent magnet motor is arranged in the shell and is provided with an output shaft for outputting driving force;

the reduction box is arranged at the front part of the shell and is in transmission connection with the permanent magnet motor body through an output shaft;

the rear shell is arranged at the rear part of the shell and is provided with an air inlet for ventilation and an air inlet assembly arranged at the air inlet;

the air inlet assembly is provided with a dust collecting piece for adsorbing metal dust and an air inlet cover for accommodating the dust collecting piece, and the dust collecting piece is movably installed inside with an adsorption piece.

Furthermore, be provided with the first ventilation hole of a plurality of on the collection dirt piece, first ventilation hole and air intake intercommunication form inlet air channel.

Furthermore, be provided with a plurality of second ventilation hole on the air inlet cover, air inlet channel passes through second ventilation hole and the outer intercommunication of casing.

Furthermore, a plurality of first through holes are formed in one side of the dust collecting piece, and the adsorption piece extends out of the dust collecting piece through the first through holes.

Furthermore, one side of the air inlet cover close to the first through hole is provided with a second through hole corresponding to the first through hole, and the adsorption piece extends out of the air inlet cover through the second through hole.

Furthermore, the absorption piece is connected with the dust collecting handle that the air inlet cover outside set up.

Furthermore, an adsorption cavity is arranged inside the adsorption piece, and a magnetic body is arranged in the adsorption cavity.

Furthermore, the air inlet is provided with a limiting groove, and the air inlet cover is provided with a limiting protrusion corresponding to the limiting groove.

Furthermore, the air inlets are arranged on two sides of the rear shell, and the two air inlets are symmetrical about the central axis of the rear shell.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses compare in the present scheme of having issued, directly block the metal dust outside the machine, prevent that the dust from getting into inside, do not need the extra isolating device of permanent-magnet machine, it prevents when the metal dust is not by adsorption effect guaranteeing permanent-magnet machine, has avoided the adverse effect that brings the permanent-magnet machine heat dissipation again, structurally also more simple, effective, reliable, also make things convenient for daily dust clearance simultaneously.

Drawings

The invention is further described with reference to the accompanying drawings and the detailed description.

Fig. 1 is a schematic structural diagram of a permanent magnet brushless electric tool according to an embodiment of the present invention;

fig. 2 is another schematic structural diagram of a permanent magnet brushless electric tool according to an embodiment of the present invention;

FIG. 3 is an exploded view of the air intake assembly in an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a rear housing in an embodiment of the present invention;

fig. 5 is an enlarged schematic view of a in fig. 4.

In the figure: 1. a housing; 2. a permanent magnet motor; 3. a reduction gearbox;

4. a rear housing; 5. an air inlet; 51. a limiting groove; 6. an air intake assembly;

7. a dust collecting member; 71. a first vent hole; 72. a first through hole; 73. an adsorbing member; 74. a magnetic body;

8. an air inlet cover; 81. a second vent hole; 82. a second through hole; 83. a limiting bulge;

9. a dust collecting handle.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationships, are used solely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, either a fixed connection or a releasable connection or an integral connection. Either directly or indirectly through intervening media, either internally or in any other relationship.

Referring to fig. 1-2, the present embodiment provides a permanent magnet brushless electric tool, which includes a housing 1, a permanent magnet motor 2, a reduction box 3, a rear housing 4, and an air intake assembly 6; the permanent magnet motor 2 is arranged in the shell 1 and is provided with an output shaft for outputting driving force; the reduction gearbox 3 is arranged at the front part of the shell 1 and is fixedly connected with the shell 1, and the reduction gearbox 3 is also called a speed reducer or a speed reducer; the reduction box 3 is connected with the permanent magnet motor 2 through an output shaft, and the electric tool obtains the required rotating speed and torque output through the reduction box 3.

In addition, the rear shell 4 is arranged at the rear part of the shell 1, an air inlet 5 for ventilation is formed at the tail part of the shell 1, the air inlet component 6 is arranged at the air inlet 5, the air inlet component 6 is provided with a dust collecting piece 7 for adsorbing metal dust and an air inlet cover 8 for accommodating the dust collecting piece 7, the air inlet cover 8 is matched with the air inlet 5 of the rear shell 4 in a concave mode, the air inlet cover 8 is arranged at the air inlet 5, so that the rear shell 4 forms a complete cylinder, the rear shell 4 is used as a handle of an electric tool, the holding hand feeling of the rear shell 4 is more comfortable, and the use feeling of a user is improved. And the dust collecting part 7 in the air intake component 6 has the function of adsorbing metal dust, so that the metal dust in the working environment can not enter the shell 1 of the electric tool along with air in the using process of the electric tool, and the dust collecting part 7 can adsorb the metal dust. And set up the adsorption part 73 that is movably mounted in the dust collecting 7, take out the adsorption part 73 when clearing up the dust collecting 7, the metal dust will drop from the dust collecting 7, so as to facilitate the cleaning work of the dust collecting 7, and has prevented the metal dust from falling into the backshell 4.

In one embodiment of the present invention, referring to fig. 3-5, a plurality of first ventilation holes 71 are formed in the dust collecting member 7, wherein the first ventilation holes 71 are communicated with the air inlet 5 to form an air inlet passage. Specifically, in the normal operation of the electric tool, the external air is required to enter the housing 1 to cool the permanent magnet motor 2, the dust collecting element 7 is provided with a plurality of first ventilation holes 71 for the air to freely enter and exit, and the first ventilation holes 71 and the air inlet 5 form an air inlet channel.

In an embodiment of the present invention, referring to fig. 3-5, a plurality of second ventilation holes 81 are provided on the air inlet cover 8, wherein the air inlet channel communicates with the outside of the housing 1 through the second ventilation holes 81. Specifically, the dust collecting element 7 is accommodated in the air inlet cover 8, and the second ventilation holes 81 are formed in the air inlet cover 8, which is also beneficial to heat dissipation of the permanent magnet motor 2.

In an embodiment of the present invention, as shown in fig. 3-5, one side of the dust collecting element 7 is opened with a plurality of first through holes 72, the adsorbing element 73 extends out of the dust collecting element 7 through the first through holes 72, so that the adsorbing element 73 can be taken out from the dust collecting element 7 through the first through holes 72, meanwhile, one side of the air inlet cover 8 close to the first through holes 72 is opened with second through holes 82 corresponding to the first through holes 72, the adsorbing element 73 extends out of the air inlet cover 8 through the second through holes 82, and since the dust collecting element 7 is accommodated in the air inlet cover 8, the adsorbing element 73 is detached from the air inlet assembly 6 and also passes through the second through holes 82 on the air inlet cover 8. In addition, still be provided with collection dirt handle 9 on the air inlet cover 8 outside, the absorption piece 73 is connected with collection dirt handle 9 to it breaks away from air inlet component 6 to be convenient for absorption piece 73, and is swift convenient, easy operation, and easy to clean.

In an embodiment of the present invention, referring to fig. 3-5, an absorption cavity is provided inside the absorption member 73, a magnetic body 74 is provided in the absorption cavity, the magnetic body 74 is used for absorbing metal dust in the air, the absorption member 73 is a carrier, the magnetic body 74 makes the absorption member 73 generate magnetism, and the magnetic body 74 can selectively use magnetic steel.

In an embodiment of the present invention, referring to fig. 2, 3 and 5, the air inlet 5 is provided with a limiting groove, the air inlet cover 8 is provided with a limiting protrusion 83 corresponding to the limiting groove 51, when the air inlet assembly 6 is installed, the limiting protrusion 83 on the air inlet cover 8 is aligned with the limiting groove 51, and the air inlet cover 8 is close to the rear shell 4 until the air inlet assembly 6 is blocked.

In an embodiment of the present invention, referring to fig. 1 and 2, the air inlets 5 are disposed on both sides of the rear housing 4, and the two air inlets 5 are symmetrical about the central axis of the rear housing 4, and the air inlets 5 having two symmetrical structures further improve the air intake efficiency, and do not affect the overall balance weight of the electric tool.

After piling up the certain degree when the metal dust on the air inlet subassembly 6, can dismantle air inlet subassembly 6 from backshell 4, dismantle the back, can dismantle inside adsorbent 73, conveniently cleared up out in the metal dust that is adsorbed from collection dirt piece 7, on backshell 4 can be packed into again to the subassembly 6 that admits air after the clearance is accomplished, used repeatedly.

The embodiment of the utility model discloses a compare in the existing scheme of having issued, directly block the metal dust outside the machine, prevent that the dust from getting into inside, do not need 2 extra isolating device of permanent-magnet machine, it is when guaranteeing that permanent-magnet machine 2 prevents that the metal dust is not by adsorption effect, has avoided the adverse effect that brings the heat dissipation of permanent-magnet machine 2 again, structurally also more simple, effective, reliable, also make things convenient for daily dust clearance simultaneously.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims

1. A permanent magnet brushless power tool, comprising:

a housing;

2. The permanent magnet brushless power tool of claim 1, wherein: the dust collecting piece is provided with a plurality of first ventilation holes, and the first ventilation holes are communicated with the air inlet to form an air inlet channel.

3. The permanent magnet brushless power tool of claim 2, wherein: the air inlet cover is provided with a plurality of second ventilation holes, and the air inlet channel is communicated with the outside of the shell through the second ventilation holes.

4. The permanent magnet brushless power tool of claim 1, wherein: a plurality of first through holes are formed in one side of the dust collecting piece, and the adsorbing piece extends out of the dust collecting piece through the first through holes.

5. The permanent magnet brushless power tool of claim 4, wherein: one side of the air inlet cover close to the first through hole is provided with a second through hole corresponding to the first through hole, and the adsorption piece extends out of the air inlet cover through the second through hole.

6. The permanent magnet brushless power tool of claim 1, wherein: the adsorption piece is connected with a dust collection handle arranged on the outer side of the air inlet cover.

7. The permanent magnet brushless power tool of claim 1, wherein: the inside absorption cavity that is equipped with of absorption piece, be provided with the magnetic substance in the absorption cavity.

8. The permanent magnet brushless power tool of claim 1, wherein: the air inlet is provided with a limiting groove, and the air inlet cover is provided with a limiting bulge corresponding to the limiting groove.

9. The permanent magnet brushless power tool of claim 1, wherein: the air inlets are arranged on two sides of the rear shell, and the two air inlets are symmetrical about the central axis of the rear shell.