CN214591011U

CN214591011U - Electric tool

Info

Publication number: CN214591011U
Application number: CN202021871321.6U
Authority: CN
Inventors: 龚早京; 潘兰志
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-11-02
Anticipated expiration: 2030-08-31

Abstract

The utility model discloses an electric tool, include: the shell is provided with a plurality of air inlets and a plurality of air outlets, and the circuit board is electrically connected with the motor and drives the motor to run; the first fan introduces airflow from an air inlet, and discharges the airflow from an air outlet after flowing through the motor to form a first cooling air channel; the second fan is introduced from the other air inlet, flows through the circuit board and then is discharged from the other air outlet to form a second cooling air channel, and the first cooling air channel and the second cooling air channel are mutually independent and isolated. Two fans are adopted to cool the motor and the circuit board respectively, and the cooling effect is enhanced.

Description

Electric tool

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electric tool field, in particular to electric tool of cutting class.

[ background of the invention ]

Be equipped with the cooling air duct in order to cool off the motor in traditional electric tool to prevent that the motor temperature is too high. With the progress of society, the application of the brushless motor is more and more popular, and the brushless motor is generally connected with a circuit board for controlling the rotating speed of the brushless motor; in addition, in general, in order to miniaturize the connecting wire between the motor and the switch, the connecting wire is changed into a circuit board, and the circuit board generates heat due to the operation of the electric power tool, so that the circuit board needs to be cooled while the motor is cooled.

Referring to chinese patent publication No. CN104114335B, there is disclosed a portable electric cutter including a centrifugal fan fixed to an output shaft of a motor, which is driven to rotate by the motor and cools the motor by a fan airflow generated by the rotation, a circuit board having a cooling air hole formed in a case, an air flow path communicating between a motor case and a circuit board case is provided between a back surface of a fan guide and an outer wall of the case, a negative pressure inside the fan guide caused by the rotation of the fan flows through the circuit board from the cooling air hole to the inside of the fan guide. However, the portable electric cutting machine cools the motor and the circuit board simultaneously through the single fan, and the original air flow for cooling the motor independently is divided into two parts, so that the good heat dissipation effect can not be achieved on the motor or the circuit board, and the service life of the product is influenced.

Therefore, there is a need for a new power tool that addresses the cooling effects of the equipment within the tool.

[ Utility model ] content

In order to solve the above problem, the present invention provides an electric tool with improved cooling effect.

In order to solve the technical problem, the utility model adopts the following technical scheme: a power tool, comprising: the air conditioner comprises a shell, a motor and a circuit board, wherein the motor and the circuit board are accommodated in the shell; the first fan introduces airflow from an air inlet, and discharges the airflow from an air outlet after flowing through the motor to form a first cooling air channel; the second fan is introduced from the other air inlet, flows through the circuit board and is then discharged from the other air outlet to form a second cooling air channel, and the first cooling air channel and the second cooling air channel are mutually independent and separated.

The further improvement scheme is as follows: the housing has a first accommodating portion accommodating the motor and a second accommodating portion accommodating the circuit board, the first cooling air duct flows through the first accommodating portion, and the second cooling air duct flows through the second accommodating portion.

The further improvement scheme is as follows: the air inlet comprises a first air inlet communicated with the first accommodating part and a second air inlet communicated with the second accommodating part, and the air outlet comprises a first air outlet communicated with the first accommodating part and a second air outlet communicated with the second accommodating part; the airflow of the first cooling air duct flows into the first accommodating part through the first air inlet, flows through the motor in the first accommodating part, and is discharged out of the first accommodating part through the first air outlet; the airflow of the second cooling air duct flows into the second accommodating portion through the second air inlet, flows through the circuit board in the second accommodating portion, and is discharged out of the second accommodating portion through the second air outlet.

The further improvement scheme is as follows: the second accommodating part further comprises a wind-blocking ring positioned on the right side of the motor and a cover plate attached to the right end of the wind-blocking ring, an inner cavity is formed by the cover plate and the wind-blocking ring in an enclosing mode, the inner cavity accommodates a second fan, a notch is formed in the inner cavity in the radial direction of the second fan, and the notch forms the second air outlet.

The further improvement scheme is as follows: the second accommodating part is also provided with a pipeline which extends along the outer side wall of the first accommodating part and is integrally formed with the first accommodating part, the pipeline and the internal cavity are communicated with each other to form the second cooling air duct, and the first air inlet is arranged on the outer ring at the right end of the cover plate.

The further improvement scheme is as follows: the outer peripheries of the wind-blocking ring and the cover plate are provided with outer cavities, the wind-blocking ring and the cover plate are both provided with inner annular walls for isolating the inner cavities from the outer cavities, and the outer cavities and the first accommodating parts form the first cooling air channels.

The further improvement scheme is as follows: the second fan is a discrete fan, and the second air outlet is arranged below the internal cavity and inclines towards the rotation direction of the discrete fan.

The further improvement scheme is as follows: the second containing part further comprises a cover plate located at the right end of the first containing part, an inner cavity is arranged on the cover plate and the right side wall of the first containing part in a surrounding mode, and the inner cavity contains the second fan.

The further improvement scheme is as follows: the second accommodating part is also provided with a pipeline which extends along the outer side wall of the first accommodating part and is integrally formed with the first accommodating part, and the pipeline is communicated with the internal cavity to form the second cooling air duct.

The further improvement scheme is as follows: the cover plate is provided with an outer cavity located on the periphery of the cover plate and an inner annular wall for isolating the outer cavity from the inner cavity, the first air inlet is formed in the periphery of the cover plate and communicated with the outer cavity, the second air inlet is formed in the middle of the cover plate and communicated with the inner cavity, and the outer cavity and the first accommodating part form the first cooling air duct.

The further improvement scheme is as follows: the electric tool is an electric circular saw, the electric circular saw comprises a bottom plate, and the shell is connected to the bottom plate in a relatively rotating mode.

The utility model discloses a another kind of scheme does: a power tool, comprising: the motor comprises a shell, a motor and a circuit board, wherein the shell is provided with a first accommodating part for accommodating the motor and a second accommodating part for accommodating the circuit board, the first accommodating part is provided with a first air inlet and a first air outlet, and the second accommodating part is provided with a second air inlet and a second air outlet; the circuit board is electrically connected with the motor and drives the motor to run; the axial both ends of motor are installed first fan and second fan respectively, and first fan forms the air current and flows in first holding portion, and the second fan forms the air current and flows in the second holding portion, just first holding portion does not link up with the second holding portion.

The further improvement scheme is as follows: the airflow flowing direction in the first accommodating part and the airflow flowing direction in the second accommodating part are at least partially parallel to each other.

Compared with the prior art the utility model discloses following beneficial effect has: the first fan and the second fan are respectively installed at the two axial ends of the motor, airflow is introduced by the first fan to cool the motor and form a first cooling air channel, airflow is introduced by the second fan to cool the circuit board running on the driving motor and form a second cooling air channel, the first cooling air channel and the second cooling air channel are mutually independent and isolated, the improvement on the air flow throughput in each air channel is facilitated, the airflow series flow or the air flow shunt in the cooling air channels is prevented, the cooling effect on the motor and the circuit board is improved, and the service life of the electric tool is prolonged.

[ description of the drawings ]

Fig. 1 is a perspective view of a first embodiment of the power tool of the present invention;

FIG. 2 is a perspective view of the right housing of FIG. 1 with the right housing removed;

FIG. 3 is a partially exploded view of FIG. 1;

FIG. 4 is a schematic view in partial cutaway of FIG. 1;

fig. 5 is a partially cut-away schematic view of a second embodiment of the power tool of the present invention.

[ detailed description ] embodiments

The following further describes a specific embodiment of the present invention with reference to the drawings and examples, wherein the electric circular saw is taken as an example to describe the embodiment of the electric power tool in detail.

Referring to fig. 1 to 4, a schematic diagram of a first embodiment of an electric tool 100 according to the present invention includes: the cutting machine comprises a shell 1, a bottom plate 7 supporting the shell 1, a motor 2 and a transmission assembly accommodated in the shell 1, and a saw blade and a circuit board 3 fixedly connected with the transmission assembly. The shell 1 is connected to the bottom plate 7 in a relatively rotating manner; the output direction of the electric circular saw is defined as left, and the housing 1 comprises a left casing 19, a right casing 12 covering the left casing 19, and a gear box 11 fixed at the left end of the left casing 19. The left casing 19 accommodates the motor 2, the gear box 11 accommodates the transmission assembly, when the electric tool 100 operates, the motor 2 drives the transmission assembly to rotate, the transmission assembly drives the saw blade to cut a workpiece, and then the casing 1 is rotated relative to the bottom plate 7 to adjust the cutting depth of the saw blade.

The housing 1 has a first receiving portion 19a for receiving the motor 2 and a second receiving portion 13 for receiving the circuit board 3, and the first receiving portion 19a and the second receiving portion 13 are not penetrated to prevent the air flow from streaming, which will be described in detail later. The left housing 19 and the right housing 12 are covered to form a handle for holding, and an accommodating cavity 13b is enclosed below the handle, the accommodating cavity 13b is adjacent to the circumferential wall of the first accommodating part 19a, the second accommodating part 13 includes the accommodating cavity 13b, and the circuit board 3 is accommodated in the accommodating cavity 13 b.

The circuit board 3 is electrically connected with the motor 2 and drives the motor 2 to operate, and the circuit board 3 comprises a driving circuit for driving the motor 2 and a control circuit for controlling the driving circuit. The motor 2 is a brushless inner rotor motor, the motor 2 includes a rotor 23 and a stator 24 mounted on the periphery of the rotor 23, the left end of the rotor 23 is supported on the gear box 11 through a bearing, the right end of the rotor is supported on the left casing 19, and the rotor 23 is axially provided with a first fan 21 at the left end and a second fan 22 at the right end respectively, and drives the first and second fans to rotate.

Be equipped with on the first portion 19a that is located its left first air outlet 6 and is located the first air intake 17a on its right side (according to the difference of chooseing for use fan specification or the difference of fan blade rotation direction, the embodiment of the utility model provides an air outlet can be regarded as to the air intake, and the air intake also can be regarded as to the air outlet of reason. The second accommodating portion 13 has a second air inlet 13a located on the left side thereof and a second air outlet 15 located on the right side thereof, the second accommodating portion 13 further includes a wind-blocking ring 16 located on the right side of the motor 2 and a cover plate 17 attached to the right end of the wind-blocking ring 16, and the wind-blocking ring 16 and the cover plate 17 are both fixed to the right side of the first accommodating portion 19 a. The cover plate 17 and the wind-break ring 16 enclose an inner cavity 17c, the inner cavity 17c accommodates a second fan 22, and the second fan 22 is a discrete fan. A through hole penetrating the accommodating chamber 13b and the inner cavity 17c is formed in the middle of the wind deflector 16, the rotor 23 has a spindle penetrating the through hole of the wind deflector 16 and extending into the inner cavity 17c, and the second fan 22 is fixed to the spindle 23 a.

The outer peripheries of the wind deflector 16 and the cover plate 17 are both provided with an outer cavity 17d, and the wind deflector 16 and the cover plate 17 are both provided with an inner annular wall which separates the inner cavity 17c from the outer cavity 17 d. The first air inlet 17a is disposed on the right outer ring of the cover plate 17 and is communicated with the outer cavity 17 d. The first fan 21 is adjacent to the right side of the gear box 11, and the first air outlet 6 is disposed on the gear box 11. The outer cavity 17d communicates with the first receiving portion 19a and forms a first cooling air passage. The first cooling air channel flows through the first accommodating portion 19a, the first fan 21 introduces airflow from the first air inlet 17a into the first cooling air channel, and the airflow flows through the motor 2 in the first accommodating portion 19a and then is discharged out of the first accommodating portion 19a through the first air outlet 6.

The second receiving portion 13 further has a duct 19b extending along an outer side wall of the first receiving portion 19a and integrally formed with the first receiving portion 19a, and the duct 19b is parallel to the first receiving portion 19a, although the "parallel" in the embodiment excludes a slight angle difference caused by draft or molding error. The above-mentioned duct 19b, the internal cavity 17c, the housing chamber 13b communicate with each other and form a second cooling air duct. The inner cavity 17c has a notch radially below the second fan 22, the notch forms the second air outlet 15, and the second air outlet 15 is inclined toward the rotation direction of the second fan 22, so that the air flow is discharged along the air flow direction of the second fan 22, and the air resistance is reduced. The second cooling air channel flows through the second accommodating portion 13, a plurality of ventilation holes are formed in the right end of the accommodating cavity 13b, the ventilation holes form the second air inlet 13a, the second fan 22 introduces air flow from the second air inlet 13a into the second cooling air channel, and the air flow passes through the circuit board and then is discharged out of the second accommodating portion 13 through the second air outlet 15. The first cooling air duct and the second cooling air duct are independent and isolated from each other, so that the interference of cross flow or shunt of air flow is prevented, and the cooling effect is further enhanced. In addition, the airflow in the pipeline 19b and the airflow in the first accommodating part 19a are parallel to each other, and different air ducts are adjacently arranged, so that the size of the electric circular saw is reduced.

The utility model discloses an electric tool 100 of first embodiment, install first fan 21 and second fan 22 respectively through the axial both ends at motor 2, first fan 21 introduces the air current and cools off the motor and form first cooling air duct, second fan 22 introduces the air current and cools off circuit board 3 and form second cooling air duct, first cooling air duct and second cooling air duct mutually independent and keep apart, be favorable to promoting the air current throughput in each wind channel, and prevent the air current series flow or the reposition of redundant personnel in the cooling air duct, the cooling effect to motor 2 and circuit board 3 has been strengthened, and then electric tool 100's life has been promoted. In addition, the airflow directions introduced by the first fan 21 and the second fan 22 in the embodiment are opposite, and the first fan 21 and the second fan 22 are adjacent to the respective air outlets, so that the airflow passing rates of the respective cooling air channels are increased, and the cooling effect is further enhanced.

Referring to fig. 5, in order to implement the second embodiment of the present invention, compared to the first embodiment, only the second receiving portion 13 'and the second cooling air duct are changed, in the second embodiment, the wind blocking ring 16 in the first embodiment is eliminated, the second air inlet 13a in the first embodiment is changed to a second air outlet 13 a', and a second air inlet 17b 'is disposed in the middle of the cover plate 17'.

In the following, the second accommodating portion 13 'and the second cooling air duct in the second embodiment are further described, and the right end of the second accommodating portion 13' has a second air inlet 17b ', and the left end has a second air outlet 13 a'.

The second receiving portion 13 ' includes a cover plate 17 ' at the right end of the first receiving portion 19a, and the cover plate 17 ' and the right side wall of the first receiving portion 19a enclose an inner cavity 17c ', and the inner cavity 17c ' receives the second fan 22. The periphery of the right end of the cover plate 17 'is provided with a first air inlet 17 a', and the second air inlet 17b 'is positioned in the middle of the right end of the cover plate 17'. The cover plate 17 'is provided with an external cavity 17 d' at the periphery thereof and an inner annular wall separating the external cavity 17d 'from the internal cavity 17 c', the first air inlet 17a 'is communicated with the external cavity 17 d', and the second air inlet 17b 'is communicated with the internal cavity 17 c'. The second receiving portion 13 ' further has a duct 19b ' extending along an outer side wall of the first receiving portion 19a and integrally formed with the first receiving portion 19a, the duct 19b ' is parallel to the first receiving portion 19a, the duct 19b ', the internal cavity 17c ', and the receiving cavity 13b ' are communicated to form the second cooling air channel, and the second fan 22 introduces an air flow from the second air inlet 17b ' into the second cooling air channel, and discharges the air flow out of the second receiving portion 13 ' through the second air outlet 13a ' after flowing through the circuit board 3.

The utility model discloses an electric tool 100 of second embodiment, install first fan 21 and second fan 22 respectively through the axial both ends at motor 2, first fan 21 introduces the air current and cools off the motor and form first cooling air duct, second fan 22 introduces the air current and cools off circuit board 3 and form second cooling air duct, first cooling air duct and second cooling air duct mutually independent and keep apart, be favorable to promoting the air current throughput in each wind channel, and prevent the air current series flow or the reposition of redundant personnel in the cooling air duct, the cooling effect to motor 2 and circuit board 3 has been strengthened, and then electric tool 100's life has been promoted.

The present invention is not limited to the above embodiments, and the scope of the present invention is defined by the claims.

Claims

1. A power tool, comprising: the air conditioner comprises a shell, a motor and a circuit board, wherein the motor and the circuit board are accommodated in the shell; the method is characterized in that: the first fan introduces airflow from an air inlet, and discharges the airflow from an air outlet after flowing through the motor to form a first cooling air channel; the second fan is introduced from the other air inlet, flows through the circuit board and then is discharged from the other air outlet to form a second cooling air channel, and the first cooling air channel and the second cooling air channel are mutually independent and isolated.

2. The power tool of claim 1, wherein: the housing has a first accommodating portion accommodating the motor and a second accommodating portion accommodating the circuit board, the first cooling air duct flows through the first accommodating portion, and the second cooling air duct flows through the second accommodating portion.

3. The power tool of claim 2, wherein: the air inlet comprises a first air inlet communicated with the first accommodating part and a second air inlet communicated with the second accommodating part, and the air outlet comprises a first air outlet communicated with the first accommodating part and a second air outlet communicated with the second accommodating part; the airflow of the first cooling air duct flows into the first accommodating part through the first air inlet, flows through the motor in the first accommodating part, and is discharged out of the first accommodating part through the first air outlet; the airflow of the second cooling air duct flows into the second accommodating portion through the second air inlet, flows through the circuit board in the second accommodating portion, and is discharged out of the second accommodating portion through the second air outlet.

4. The power tool of claim 3, wherein: the second accommodating part further comprises a wind-blocking ring positioned on the right side of the motor and a cover plate attached to the right end of the wind-blocking ring, an inner cavity is formed by the cover plate and the wind-blocking ring in an enclosing mode, the inner cavity accommodates a second fan, a notch is formed in the inner cavity in the radial direction of the second fan, and the notch forms the second air outlet.

5. The power tool of claim 4, wherein: the second accommodating part is also provided with a pipeline which extends along the outer side wall of the first accommodating part and is integrally formed with the first accommodating part, the pipeline and the internal cavity are communicated with each other to form the second cooling air duct, and the first air inlet is arranged on the outer ring at the right end of the cover plate.

6. The power tool of claim 5, wherein: the outer peripheries of the wind-blocking ring and the cover plate are provided with outer cavities, the wind-blocking ring and the cover plate are both provided with inner annular walls for isolating the inner cavities from the outer cavities, and the outer cavities and the first accommodating parts form the first cooling air channels.

7. The power tool of claim 6, wherein: the second fan is a discrete fan, and the second air outlet is arranged below the internal cavity and inclines towards the rotation direction of the discrete fan.

8. The power tool of claim 3, wherein: the second containing part further comprises a cover plate located at the right end of the first containing part, an inner cavity is arranged on the cover plate and the right side wall of the first containing part in a surrounding mode, and the inner cavity contains the second fan.

9. The power tool of claim 8, wherein: the second accommodating part is also provided with a pipeline which extends along the outer side wall of the first accommodating part and is integrally formed with the first accommodating part, and the pipeline is communicated with the internal cavity to form the second cooling air duct.

10. The power tool of claim 9, wherein: the cover plate is provided with an outer cavity located on the periphery of the cover plate and an inner annular wall for isolating the outer cavity from the inner cavity, the first air inlet is formed in the periphery of the cover plate and communicated with the outer cavity, the second air inlet is formed in the middle of the cover plate and communicated with the inner cavity, and the outer cavity and the first accommodating part form the first cooling air duct.

11. The power tool of claim 1, wherein: the electric tool is an electric circular saw, the electric circular saw comprises a bottom plate, and the shell is connected to the bottom plate in a relatively rotating mode.

12. A power tool, comprising: the motor comprises a shell, a motor and a circuit board, wherein the shell is provided with a first accommodating part for accommodating the motor and a second accommodating part for accommodating the circuit board, the first accommodating part is provided with a first air inlet and a first air outlet, and the second accommodating part is provided with a second air inlet and a second air outlet; the circuit board is electrically connected with the motor and drives the motor to run; the method is characterized in that: the axial both ends of motor are installed first fan and second fan respectively, and first fan forms the air current and flows in first holding portion, and the second fan forms the air current and flows in the second holding portion, just first holding portion does not link up with the second holding portion.

13. The power tool of claim 12, wherein: the airflow flowing direction in the first accommodating part and the airflow flowing direction in the second accommodating part are at least partially parallel to each other.