CN218658894U - Electric tool - Google Patents

Abstract

The utility model relates to an electric tool, including the casing, install in the actuating mechanism and the automatically controlled subassembly of casing and connect in actuating mechanism's cooling fan, automatically controlled subassembly control actuating mechanism's the circular telegram. The shell is provided with a main body part for accommodating the driving mechanism, a handle part connected with the main body part, and an air inlet and an air outlet which penetrate through the shell, wherein part of the electric control assembly is arranged in the handle part, and the air inlet is positioned between the driving mechanism and the electric control assembly. The electric tool also comprises an air guide piece arranged on the shell, the air guide piece is arranged close to the air inlet, part of the external air flowing into the shell from the air inlet impacts the air guide piece, flows to the electric control component, flows through the driving mechanism and then flows out from the air outlet; the other part directly flows to the driving mechanism and then flows out from the air outlet. The utility model discloses a nature sets up air guide outside air and directly dispels the heat to actuating mechanism and automatically controlled subassembly, and simple structure and radiating effect are good.

Description

Electric tool

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electric tool, in particular to an electric tool for occasions such as construction, decoration, building and the like.

[ background of the invention ]

The power tool may be used to machine a workpiece by cutting, dividing or removing material, and may also be used to perform assembly operations such as rivet insertion, screw attachment, and the like. A commonly used hand-held power tool may be in the form of a drill, grinder, cutter, saw or the like, which is generally equipped with a cooling structure for cooling the motor, but heat dissipation to the control part still needs to be improved. However, the control part is often provided with a switching element for controlling the starting and stopping of the motor, the heating value is extremely high, the service life of the control part is influenced on one hand, and on the other hand, the heat transfer causes the temperature of the whole control part to rise, so that other components are influenced. If the heat on the control part is not radiated in time, the whole service life of the control part is greatly influenced.

In view of the above-mentioned improvement, chinese patent No. CN102825585B, which was published 2016, 07, 27, discloses an electric drill, which includes a housing, a motor housed in the housing, a power transmission unit, a control unit, and a cooling fan attached to the motor, wherein a plurality of intake ports for taking in external air and a plurality of discharge ports for discharging external air are formed in the housing, and a switching element of the control unit is disposed in a cooling air passage flowing into the housing by rotation of the cooling fan and on an upstream side of the motor, thereby improving cooling efficiency of the switching element. According to the technical scheme, the taking-in port and the discharging port are arranged in the extending direction of the motor shell, so that cooling air firstly flows through the power transmission part and then cools the control part, and then the motor is cooled, the temperature of the cooling air flowing through the motor is increased, the motor cannot be effectively cooled, and the service life of the motor is damaged. Secondly, if set up two solitary cooling air ducts and dispel the heat to motor and control part respectively, cause the waste of instrument inner space, structural layout is not compact, does not conform to the development trend of whole miniaturization.

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

[ Utility model ] content

To the deficiency of the prior art, the utility model aims to provide an electric tool with good heat dissipation effect and compact structure.

The utility model provides a prior art problem can adopt following technical scheme: an electric tool comprises a shell, a driving mechanism and an electric control assembly which are arranged on the shell, and a cooling fan connected to the driving mechanism, wherein the electric control assembly controls the on-off of the driving mechanism; the electric tool also comprises an air guide piece arranged on the shell, wherein the air guide piece is arranged close to the air inlet, part of external air flowing into the shell from the air inlet impacts the air guide piece, flows to the electric control component, flows through the driving mechanism and then flows out from the air outlet; the other part directly flows to the driving mechanism and then flows out of the air outlet.

The further improvement scheme is as follows: the air guide has and is fixed in the fixed part of casing and certainly the fixed part orientation the guide portion of automatically controlled subassembly protraction, the guide portion with the air intake is the contained angle setting, just the contained angle is less than 90.

The further improvement scheme is as follows: the handle portion has a middle portion connected to the main body portion and a grip portion extending from the middle portion away from the main body portion, and the electronic control assembly is mounted to the middle portion.

The further improvement scheme is as follows: the electric control assembly is provided with an electric control substrate for controlling the driving mechanism, the electric control substrate is flat and is arranged at the middle part, and the end part of the air inlet is closer to the electric control substrate than the farthest end of the guide part far away from the fixing part.

The further improvement scheme is as follows: the cooling fan is a centrifugal fan and is accommodated in an end portion of the main body portion.

The further improvement scheme is as follows: the shell is provided with a rib position protruding from the inner wall, the rib position is located above the air inlet, and the driving mechanism and external air are partially isolated.

The further improvement scheme is as follows: the air guide piece is fixed on the rib position.

The further improvement scheme is as follows: the driving mechanism is provided with a rotor arranged on the main body part, a stator sleeved on the periphery of the rotor and a rotating shaft penetrating through the rotor, and the rib is positioned on the axial periphery of the stator and extends to the axial front end of the stator.

The further improvement scheme is as follows: and part of the air inlet is positioned at the front end of the rib position.

Compared with the prior art, the utility model discloses following beneficial effect has: the air inlet is arranged between the driving mechanism and the electric control assembly, and the air guide piece is arranged around the air inlet, so that the external air is directly blown to the driving mechanism and the electric control assembly respectively, and the heat dissipation effect is good; meanwhile, the air inlet is only partially covered by the air guide piece, so that the effect of shunting the outside air is achieved, the structure is simple, and the layout is compact.

[ 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 overall structure of an electric tool according to a preferred embodiment of the present invention;

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

FIG. 3 is a schematic view of the housing of the power tool of FIG. 1;

fig. 4 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of the electric power tool shown in fig. 3.

[ detailed description ] embodiments

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

The terminology used in the description of the invention 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", "left", "right", etc., indicating orientations or positional relationships are based only on the orientations or positional relationships shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device/element referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Referring to fig. 1 and 2, an embodiment of the present invention relates to an electric tool, and a polishing machine 100 is used as a preferred embodiment of the present invention, and the polishing machine 100 is widely used in the fields of decoration, building, and the like. The polishing machine 100 comprises a housing 1, a driving mechanism 2 and an output shaft 4 which are arranged in the housing 1, a transmission mechanism 3 connected between the driving mechanism 2 and the output shaft 4, an electric control assembly 5 electrically connected with the driving mechanism 2, and a power source 6 for providing electric energy. The front end of the output shaft 4 is provided with a working head 200, and the working head 200 can be accessories such as a polishing disk. Preferably, power source 6 is a battery pack, which is electrically connected to drive mechanism 2 and electronic control assembly 5 to provide power supply for polisher 100. After a user activates the electric control assembly 5, the driving mechanism 2 is started under the action of the power source 6 to drive the transmission mechanism 3 to decelerate, and then the working head 200 on the output shaft 4 is driven to rotate at a relatively low rotating speed to perform operations such as polishing and grinding.

In the present embodiment, the housing 1 includes a main body 11 for accommodating the driving mechanism 2, a handle 12 for accommodating the electric control unit 5, ribs 13 protruding from an inner wall of the main body 11, and an air inlet 14 and an air outlet 15 penetrating the housing 1. The main body 11 extends substantially in the front-rear direction, the handle 12 is connected to the main body 11 and extends downward from the lower end of the main body 11, and the main body 11 and the handle 12 are substantially 7-shaped for the user to hold.

Specifically, the main body 11 has a gear box portion 111 to which the drive mechanism 2 and the transmission mechanism 3 are mounted, and a head housing portion 112 to which the output shaft 4 is fixed, and the gear box portion 111 and the head housing portion 112 are fixedly connected by screws.

Referring to fig. 3, the handle portion 12 has an intermediate portion 121 connected to the gear case portion 111 and a grip portion 122 extending from the intermediate portion 121 away from the gear case portion 111, and the power source 6 is detachably mounted in the grip portion 122.

Preferably, the gear housing portion 111, the intermediate portion 121, and the grip portion 122 are integrally formed, the intake vent 14 is disposed between the gear housing portion 111 and the intermediate portion 121, and the exhaust vent 15 is disposed at a rear end of the gear housing portion 111.

The rib 13 is substantially perpendicular to the inner wall of the gear housing portion 111 and is located above the air inlet 14. Preferably, the rib 13 extends substantially in the axial direction of the output shaft 4, is formed on the periphery of the drive mechanism 2, and can isolate a part of the drive mechanism 2 from the outside air.

In the present embodiment, the driving mechanism 2 is a brushless motor, and includes a rotor 21 attached to the main body 11, a stator 22 fitted around the outer periphery of the rotor 21, a rotating shaft 23 penetrating the rotor 21, and stator end caps 24 fixed to both ends of the stator 22. A pinion gear at the front end of the rotating shaft 23 is engaged with the transmission mechanism 3 to transmit the rotation of the drive mechanism 2 to the output shaft 4.

The output shaft 4 is supported in the head housing part 112 through a pair of bearings, and one end of the output shaft protrudes into the gear box part 111 and is meshed with the transmission mechanism 3; the other end projects outside the head housing portion 112 for mounting the working head 200.

In addition, the head housing part 112 is provided with a shaft lock 103, and the tail end of the pressing shaft lock 103 extends into the through hole 41 on the output shaft 4 to limit the rotation of the output shaft 4, so that the working head 200 can be replaced conveniently.

In the present embodiment, the electronic control assembly 5 is used for controlling the power on/off of the driving mechanism 2, and the electronic control assembly 5 includes a switch 51 accommodated in the holding portion 122, an electronic control substrate 53 accommodated in the middle portion 121, and a hall plate 52 located between the driving mechanism 2 and the transmission mechanism 3. The electric control substrate 53 is flat and disposed between the driving mechanism 2 and the switch 51, so as to facilitate the arrangement of electric wires.

Specifically, trigger 101 is mounted on switch 51, both of which are mounted on grip portion 122, to facilitate one-handed operation of polisher 100 by a user. When the lock switch 102 is in the unlocked state, the user presses the trigger 101 to activate the switch 51 to drive the drive mechanism 2 to rotate; when the lock switch 102 is in the locked state, the trigger 101 cannot be pressed, preventing false triggering.

The electric control substrate 53 is provided with a driving circuit and a control circuit, the driving circuit is provided with a switching tube for controlling the on/off of the driving mechanism 2, the control circuit is provided with a microprocessor for controlling the on/off of the switching tube, and the microprocessor is positioned at the front end of the switching tube. Further, the switch tube is located below the air inlet 14.

The hall plate 52 is fixed to the stator cover 24, and the hall plate 52 detects the rotational position of the rotor 21 and then sends the position information to the electronic control board 53 to detect the rotation of the drive mechanism 2.

Referring to fig. 2 to 4, the polishing machine 100 further includes a cooling fan 8 connected to the driving mechanism 2 and an air guide 7 installed in the main body 11, wherein the air guide 7 is disposed adjacent to the air inlet 14.

In the present embodiment, the cooling fan 8 is a centrifugal fan and is housed in an end portion of the gear case portion 111. The air inlet 14 is located between the driving mechanism 2 and the electronic control substrate 53. When the driving mechanism 2 drives the cooling fan 8 to rotate, external air flows into the polishing machine 100 from the air inlet 14, a part of the external air collides with the air guide 7, flows to the electric control substrate 5 to dissipate heat of devices such as a switching tube, flows through the driving mechanism 2, and then flows out from the air outlet 15; the other part flows directly to the driving mechanism 2 and then flows out from the air outlet 15.

The air guide 7 covers part of the air inlet 14, so that the external air is divided into two paths which are respectively and directly blown to the control substrate 53 and the driving mechanism 2, the heat dissipation effect is good, an additional air channel is not required to be added, the structure is simple, and the whole layout is compact.

Specifically, the air guide 7 has a fixing portion 71 fixed to the rib 13 and a guiding portion 72 protruding from the fixing portion 71 toward the electronic control board 53, and the guiding portion 72 is disposed at an angle smaller than 90 ° with the air inlet.

Further, the air guide member 7 is integrally formed with the rib position 13 or fixed in a split manner. Preferably, the air guide 7 may be a rubber pad, which is directly adhered or fastened to the rib 13.

Preferably, the end of the air inlet 14 is closer to the electronic control board 53 than the farthest end of the guiding portion 72 from the fixing portion 71, so as to facilitate the inflow of the external air and directly dissipate the heat of the driving mechanism 2.

Preferably, the axial front end of the air inlet 14 exceeds the guiding portion 72, and a part of the air inlet 14 is located at the front end of the rib portion 13, so as to facilitate the inflow of the external air and directly dissipate the heat of the driving mechanism 2.

In the present embodiment, the rib 13 is located on the outer periphery of the stator 22 in the axial direction and extends to the front end of the stator 22 in the axial direction, so that the outside air flows in from the front end of the drive mechanism 2, and the heat radiation effect of the entire drive mechanism is good.

The utility model discloses a set up air intake 14 between actuating mechanism 2 and automatically controlled subassembly 5, and set up wind-guiding piece 7 around air intake 14, make the outside air directly blow to actuating mechanism 2 and automatically controlled subassembly 5 respectively, the radiating effect is good; meanwhile, the air inlet 14 is only partially covered by the air guide 7, so that the effect of shunting the outside air is achieved, the structure is simple, and the layout is compact.

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 (9)

1. An electric tool comprises a shell, a driving mechanism and an electric control assembly which are arranged on the shell, and a cooling fan connected to the driving mechanism, wherein the electric control assembly controls the on-off of the driving mechanism; the method is characterized in that: the electric tool also comprises an air guide piece arranged on the shell, wherein the air guide piece is arranged close to the air inlet, part of external air flowing into the shell from the air inlet impacts the air guide piece, flows to the electric control component, and flows out from the air outlet after flowing through the driving mechanism; the other part directly flows to the driving mechanism and then flows out from the air outlet.

2. The power tool of claim 1, wherein: the air guide has and is fixed in the fixed part of casing and certainly the fixed part orientation the guide portion of automatically controlled subassembly protraction, the guide portion with the air intake is the contained angle setting, just the contained angle is less than 90.

3. The power tool of claim 2, wherein: the handle portion has a middle portion connected to the main body portion and a grip portion extending from the middle portion away from the main body portion, and the electronic control assembly is mounted to the middle portion.

4. The power tool of claim 3, wherein: the electric control assembly is provided with an electric control substrate for controlling the driving mechanism, the electric control substrate is flat and is arranged at the middle part, and the end part of the air inlet is closer to the electric control substrate than the farthest end of the guide part far away from the fixing part.

5. The power tool of claim 1, wherein: the cooling fan is a centrifugal fan and is accommodated in an end portion of the main body portion.

6. The power tool of claim 5, wherein: the shell is provided with a rib position protruding from the inner wall, the rib position is located above the air inlet, and the driving mechanism and external air are partially isolated.

7. The power tool of claim 6, wherein: the air guide piece is fixed on the rib position.

8. The power tool of claim 6, wherein: the driving mechanism is provided with a rotor arranged on the main body part, a stator sleeved on the periphery of the rotor and a rotating shaft penetrating through the rotor, and the rib is positioned on the axial periphery of the stator and extends to the axial front end of the stator.

9. The power tool of claim 8, wherein: and part of the air inlet is positioned at the front end of the rib position.

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