CN211073478U

CN211073478U - Electric tool

Info

Publication number: CN211073478U
Application number: CN201921526429.9U
Authority: CN
Inventors: 吴威; 陆晓峰
Original assignee: Jiangsu Dongcheng M&e Tools Co ltd
Current assignee: Jiangsu Dongcheng M&e Tools Co ltd
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2020-07-24
Anticipated expiration: 2029-09-12

Abstract

The utility model provides an electric tool, including the casing, hold the motor in the casing and connect in the carbon brush of motor, the motor includes the commutator of sliding contact carbon brush and is located the bearing of commutator rear side, the casing includes the first air intake of neighbouring commutator, the air outlet with first air intake fluid intercommunication, the bearing chamber of holding bearing and the support that supports the carbon brush, the bearing chamber is located the rear side of first air intake, the support is located first air intake both sides from top to bottom, and be formed with the clearance between bearing chamber and the support, the casing includes the first wind guiding muscle of stretching inwards from the internal face, first wind guiding muscle is connected in the upper and lower both sides of bearing chamber and is extended to in the clearance. The utility model discloses a set up first air guide muscle in the clearance of bearing room and support, the air current that the guide got into from first air intake blows to the contact position of carbon brush and commutator to the accurate cooling of main portion of generating heat, improved the heat dispersion of complete machine greatly.

Description

Electric tool

[ technical field ]

The utility model relates to an electric tool, in particular to an electric tool for decoration and building occasions.

[ background art ]

An electric tool is a power machine driven by a motor, and plays an increasingly important role in the industries of construction, decoration and the like. The motor is used as a core component of the electric tool, when the electric tool works under a heavy load or is locked, the temperature rises very fast, particularly the contact position of the carbon brush and the commutator, and the local temperature is very high due to the high-speed rotation of the commutator and the continuous friction of the carbon brush. The existing electric tool can be provided with a cooling air duct generally to cool and radiate the electric tool, but because the design of the cooling air duct is not good, the local cooling effect of the motor is poor, the local heating is easy to cause to be serious and burn, and the motor and the electric tool are damaged.

Please refer to chinese utility model No. CN204800591U published in 11/25/2015, which discloses an electric tool with a cooling system, comprising a housing, a motor and a cooling system for cooling the motor; the cooling system comprises an internal cooling air channel arranged inside the motor and an external cooling air channel surrounded between the motor and the casing, so that the inside and the outside of the motor can be cooled and radiated simultaneously. Because the air duct is arranged in the motor, the motor structure is complex, and the local cooling effect of the motor is not satisfactory.

Accordingly, there is a need for an improved power tool that overcomes the deficiencies of the prior art.

[ contents of utility model ]

To the not enough of prior art, the utility model aims to provide an electric tool that simple structure and radiating effect are good.

The utility model provides a prior art problem can adopt following technical scheme: an electric tool comprises a machine shell, a motor and a carbon brush, wherein the motor is contained in the machine shell, the carbon brush is connected to the motor, the motor comprises a commutator in sliding contact with the carbon brush, and a bearing is located on the rear side of the commutator. The shell comprises a first air inlet close to the commutator, an air outlet communicated with the first air inlet in a fluid mode, a bearing chamber for accommodating the bearing and a support for supporting the carbon brush, wherein the bearing chamber is located on the rear side of the first air inlet, the support is located on the upper side and the lower side of the first air inlet, and a gap is formed between the bearing chamber and the support. The casing comprises a first air guiding rib which protrudes inwards from the inner wall surface, and the first air guiding rib is connected to the upper side and the lower side of the bearing chamber and extends into the gap.

The further improvement scheme is as follows: the bearing chamber protrudes inwards from the inner wall surface of the shell and guides airflow entering from the first air inlet to blow towards the carbon brush and the commutator, and the first air guide rib guides airflow entering from the first air inlet to blow towards the contact position of the carbon brush and the commutator.

The further improvement scheme is as follows: the shell comprises a second air inlet arranged at the upper part, and the second air inlet is adjacent to the carbon brush.

The further improvement scheme is as follows: the shell comprises a second air guiding rib protruding from the second air inlet, and the second air guiding rib guides airflow entering from the second air inlet to blow towards the carbon brush and the commutator.

The further improvement scheme is as follows: the shell comprises a first shell and a second shell which are mutually covered, and the first air inlet is oppositely arranged on the first shell and the second shell.

The further improvement scheme is as follows: the first casing with all be provided with on the second casing first air guide muscle, just first air guide muscle is in first casing with relative setting on the second casing.

The further improvement scheme is as follows: the first air guiding rib is arranged on the first casing and protrudes into the second casing.

The further improvement scheme is as follows: the electric tool comprises a fan connected to the motor, the motor comprises a rotor connected to the commutator, the commutator and the fan are respectively arranged on two sides of the rotor, and the fan is adjacent to the air outlet.

Compared with the prior art, the utility model discloses following beneficial effect has: the first air guide rib is arranged in the gap between the bearing chamber and the bracket, and guides the airflow entering from the first air inlet to blow to the contact position of the carbon brush and the commutator so as to accurately cool the main heating part, thereby greatly improving the heat dissipation performance of the whole machine; meanwhile, through the arrangement of the two air inlets, cooling air flow entering the interior of the shell is increased, and the heat dissipation performance of the electric tool is effectively improved.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a schematic view of the whole electric tool of the present invention;

FIG. 2 is a cross-sectional view of the power tool shown in FIG. 1;

FIG. 3 is an enlarged view of circle A of the power tool shown in FIG. 2;

FIG. 4 is a schematic view of a wind tunnel of the power tool shown in FIG. 1;

FIG. 5 is a schematic view of a first air guide rib of the power tool shown in FIG. 1;

fig. 6 is another schematic structural view of the first air guide rib of the electric power tool shown in fig. 1.

[ detailed description of the invention ]

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

Referring to fig. 1 and 2, in an electric tool 100 according to a first embodiment of the present disclosure, the electric tool 100 includes a housing 1, a motor 2 accommodated in the housing 1, a carbon brush 3 connected to the motor 2, a fan 4 driven by the motor 2, and a working head 5. When the electric tool 100 operates, the motor 2 is started, the motor 2 rotates and drives the fan 4 and the working head 5 to move so as to perform operation, and the fan 4 is used for cooling and radiating the motor 2.

As shown in fig. 4, the casing 1 includes a first casing and a second casing that are covered with each other, the first casing and the second casing are enclosed to form an accommodating space, the motor 2, the carbon brush 3 and the fan 4 are all installed in the accommodating space, and the working head 5 protrudes out of the casing 1.

Referring to fig. 2, the motor 2 includes a commutator 21 slidably contacting the carbon brushes 3, a bearing 22 disposed at a rear side of the commutator 21, a rotor 23 connected to the commutator 21, and the commutator 21 and the fan 4 arranged at both sides of the rotor 23.

Referring to fig. 1 to 4, the casing 1 includes a first air inlet 11 adjacent to the commutator 21, a second air inlet 15 adjacent to the carbon brush 3, an air outlet 12 in fluid communication with the first air inlet 11 and the second air inlet 15, a first air guiding rib 13 protruding inward from an inner wall surface of the casing 1, a bearing chamber 14 accommodating a bearing 22, a second air guiding rib 16 protruding at the second air inlet 15, and a support 17 supporting the carbon brush 3. The first air inlet 11 and the second air inlet 15 are arranged at the rear end of the casing 1, the first air inlet 11 is arranged on two side surfaces of the casing 1 relatively, that is, the first air inlet 11 is arranged on the first casing and the second casing relatively, and the second air inlet 15 is arranged at the top of the casing 1; the air outlet 12 is opened at the front end of the casing 1 and is oppositely arranged on two side surfaces of the casing 1, and the air outlet 12 is adjacent to the fan 4. The outside air flow enters the inside of the cabinet 1 through the first air inlet 11 and the second air inlet 15, and is discharged from the air outlet 12. Through setting up two air intakes, increase the cooling air current that gets into casing 1 inside, effectively improve electric tool's heat dispersion.

In the present embodiment, the bearing chamber 14 is located at the rear side of the first inlet port 11, the bracket 17 is located at the upper and lower sides of the first inlet port 11, a gap is formed between the bearing chamber 14 and the bracket 17, and the first air guiding rib 13 is connected to the upper and lower sides of the bearing chamber 14 and extends into the gap. The second air guiding rib 16 guides the air flow entering from the second air inlet 15 to blow toward the carbon brush 3 and the commutator 21, the bearing chamber 14 protrudes inward from the inner wall surface of the housing 1 and guides the air flow entering from the first air inlet 11 to blow toward the carbon brush 3 and the commutator 21, and the first air guiding rib 13 guides the air flow entering from the first air inlet 11 to blow toward the contact position of the carbon brush 3 and the commutator 21. The first air guiding ribs 13 are arranged in the gap between the bearing chamber 14 and the bracket 17, and air flow entering from the first air inlets 11 is guided to blow to the contact positions of the carbon brush 3 and the commutator 21, so that main heating parts are accurately cooled, and the heat dissipation performance of the whole machine is greatly improved.

Referring to fig. 5 again, in the present embodiment, the first air guiding rib 13 is disposed on both the first housing and the second housing, and the first air guiding rib 13 is disposed on the first housing and the second housing oppositely.

Referring to fig. 6, in another embodiment of the present invention, the first air guiding rib 13' is disposed in the first housing and protrudes into the second housing to guide the air flow entering from the first air inlet to the contact position between the carbon brush and the commutator.

The utility model discloses a set up first air guide muscle 13 in bearing room 14 and support 17's clearance, the air current that the guide got into from first air intake 11 blows to the contact position of carbon brush 3 and commutator 21 to the accurate cooling of main part of generating heat, improved the heat dispersion of complete machine greatly. Through setting up two air intakes, increase the cooling air current that gets into casing 1 inside, effectively improve electric tool's heat dispersion.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many other alternatives to the power tool may be made without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An electric tool (100) comprises a machine shell (1), a motor (2) accommodated in the machine shell (1) and a carbon brush (3) connected with the motor (2), the motor (2) comprises a commutator (21) in sliding contact with the carbon brush (3) and a bearing (22) positioned at the rear side of the commutator (21), the machine shell (1) comprises a first air inlet (11) adjacent to the commutator (21), an air outlet (12) communicated with the first air inlet (11) in a fluid mode, a bearing chamber (14) accommodating the bearing (22) and a bracket (17) supporting the carbon brush (3), the bearing chamber (14) is positioned at the rear side of the first air inlet (11), the bracket (17) is positioned at the upper side and the lower side of the first air inlet (11), and a gap is formed between the bearing chamber (14) and the bracket (17); the method is characterized in that: the casing (1) comprises a first air guiding rib (13) protruding inwards from the inner wall surface, and the first air guiding rib (13) is connected to the upper side and the lower side of the bearing chamber (14) and extends into the gap.

2. The power tool (100) of claim 1, wherein: the bearing chamber (14) protrudes inwards from the inner wall surface of the machine shell (1) and guides airflow entering from the first air inlet (11) to blow towards the carbon brush (3) and the commutator (21), and the first air guide rib (13) guides airflow entering from the first air inlet (11) to blow towards the contact position of the carbon brush (3) and the commutator (21).

3. The power tool (100) of claim 1, wherein: the machine shell (1) comprises a second air inlet (15) formed in the upper portion, and the second air inlet (15) is adjacent to the carbon brush (3).

4. The power tool (100) of claim 3, wherein: the machine shell (1) comprises a second air guiding rib (16) protruding from the second air inlet (15), and the second air guiding rib (16) guides air flow entering from the second air inlet (15) to blow towards the carbon brush (3) and the commutator (21).

5. The power tool (100) of claim 1, wherein: the shell (1) comprises a first shell and a second shell which are mutually covered, and the first air inlet (11) is oppositely arranged on the first shell and the second shell.

6. The power tool (100) of claim 5, wherein: the first air guide ribs (13) are arranged on the first machine shell and the second machine shell, and the first air guide ribs (13) are arranged on the first machine shell and the second machine shell oppositely.

7. The power tool (100) of claim 5, wherein: the first air guiding rib (13) is arranged in the first shell and protrudes into the second shell.

8. The power tool (100) of claim 1, wherein: the electric tool (100) comprises a fan (4) connected to the motor (2), the motor (2) comprises a rotor (23) connected to the commutator (21), the commutator (21) and the fan (4) are respectively arranged on two sides of the rotor (23), and the fan (4) is adjacent to the air outlet (12).