CN215392873U

CN215392873U - AC brushless cutting tool

Info

Publication number: CN215392873U
Application number: CN202121181635.8U
Authority: CN
Inventors: 侯维平
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2021-05-29
Filing date: 2021-05-29
Publication date: 2022-01-04
Anticipated expiration: 2031-05-29

Abstract

An AC brushless cutting tool comprises a shell, a motor accommodated in the shell, a working head driven by the motor, a control panel connected with the motor, a front fan positioned at the front end of the motor in the axial direction, and a rear fan positioned at the rear end of the motor shaft; the shell comprises a gear box shell for accommodating the front fan and the working head, a handle shell for accommodating the control panel and a motor shell for accommodating the motor and the rear fan, wherein the handle shell is communicated with the gear box shell and is provided with an air inlet adjacent to the control panel; the motor shell is provided with a second air duct flowing through the motor, and the first air duct and the second air duct are arranged independently. The first air channel and the second air channel are mutually independent and vertically arranged, the heat dissipation function is effectively exerted, the structure is simple, and popularization and application are facilitated.

Description

AC brushless cutting tool

[ technical field ]

The utility model relates to the technical field of electric tools, in particular to an alternating current brushless cutting tool.

[ background art ]

Electric circular saws that are commonly available on the market today generally include: alternating current brushed circular saw, direct current brushless circular saw; compared with a direct current circular saw, the alternating current circular saw is lighter in mass, stronger in cutting power and free of the discharge time of a battery pack, so that the cutting working condition of the professional field is adapted. As brushless motor technology has developed and matured, various ac power tools have also begun to attempt to incorporate brushless motors. Compared with a brush motor, the brushless motor can enhance the overload capacity of the electric circular saw, prolong the service life and has the advantages of small volume and light weight; however, the ac brushless electric circular saw needs a large circuit board to perform the commutation, the current limiting protection, the temperature protection, etc. of the ac current, and the circuit board itself has a large volume, a heavy mass, and a large amount of heat is generated.

Chinese patent publication No. CN1041114335B discloses a portable electric cutting machine, which comprises a rear fan fixed on an output shaft of a motor, wherein the motor is driven to rotate to generate an air flow to cool the motor, an air hole is formed in a housing for accommodating a circuit board, and the cooling air flow flows through the circuit board from the air hole and then reaches the rear fan, so as to cool the motor and dissipate heat of the circuit board. However, the circuit board of the ac brushless electric circular saw generates a large amount of heat, and a portion of the airflow of the motor cooling air is utilized to dissipate heat from the circuit board, which results in a long heat dissipation path and large airflow loss, and thus obviously fails to meet the heat dissipation requirement of the circuit board.

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

[ contents of utility model ]

In view of the deficiencies of the prior art, an object of the present invention is to provide an ac brushless cutting tool, which can provide an effective heat dissipation path for a circuit board, thereby improving the heat dissipation effect of the circuit board.

The technical scheme adopted by the utility model for solving the problems in the prior art is as follows: an alternating current brushless cutting tool comprises a shell, a motor, a working head and a control panel, wherein the motor is accommodated in the shell, the working head is driven by the motor, the control panel is connected with the motor, the working head is connected to the axial front end of the motor, the control panel controls the starting and stopping of the motor, and the alternating current brushless cutting tool further comprises a front fan and a rear fan, the front fan is located at the axial front end of the motor, and the rear fan is located at the axial rear end of the motor; the shell comprises a gear box shell for accommodating the front fan and the working head, a handle shell for accommodating the control panel and a motor shell for accommodating the motor and the rear fan, the handle shell is communicated with the gear box shell and is provided with an air inlet adjacent to the control panel, the motor drives the front fan to rotate, so that external air enters the handle shell from the air inlet and flows into the gear box shell after flowing through the control panel to form a first air channel; the motor shell is provided with a second air duct flowing through the motor, and the first air duct and the second air duct are arranged independently.

As a further optimization scheme, the motor is provided with a motor shaft extending along the axial direction, the control plate is located below the motor shaft, and the direction of the air inlet is perpendicular to the axial direction of the motor shaft.

As a further optimization scheme, the alternating current brushless cutting tool comprises a heat dissipation piece connected to the control board, the heat dissipation piece is located in the handle shell and comprises a heat dissipation surface connected to the control board and a plurality of heat dissipation columns supporting the heat dissipation surface, and the air inlet is right opposite to the heat dissipation piece.

As a further optimization scheme, the first air duct comprises a handle air duct arranged in the handle shell and a gear box air duct arranged in the gear box shell, the handle air duct flows through the control board and the plurality of heat dissipation columns, and the gear box air duct rotates along the circumferential direction of the outer edge of the front fan.

As a further refinement, the handle housing comprises a first half-shell adjacent the gearbox housing and a second half-shell adjacent the motor housing, the first and second half-shells together forming a receiving cavity for receiving the control board.

As a further optimization scheme, the second air duct comprises a plurality of air suction openings arranged on the periphery of the motor shell, and the plurality of air suction openings are uniformly distributed on the periphery of the motor shell.

As a further optimized scheme, the second air duct includes a blowing port disposed on an end cover of the motor housing end, and the motor drives the rear fan to rotate, so that external air enters the motor housing from the suction port, flows through the motor, and flows out from the blowing port.

As a further optimization scheme, a wind blocking ring sleeved on the periphery of the motor is arranged in the motor shell, and the wind blocking ring is communicated with the air suction opening and the air blowing opening.

As a further optimized scheme, the motor is an inner rotor brushless motor, and the front fan and the rear fan are both centrifugal fans.

Compared with the prior art, the utility model has the following beneficial effects: leading fan and rearmounted fan are used for cooling heat dissipation to control panel and motor respectively, and the first wind channel between leading fan and the control panel is short and smooth-going, has obviously reduced the loss of amount of wind, and the radiating effect to the control panel is showing the reinforcing, and the second wind channel between rearmounted fan and the motor is exclusively used in and cools off the heat dissipation to the motor, and the wind channel route is short equally, high-efficient, is favorable to the motor heat dissipation. In a word, first wind channel and second wind channel mutually independent and perpendicular setting have exerted heat dissipation function separately high-efficiently, and simple structure does benefit to popularization and application.

[ description of the drawings ]

The following detailed description of embodiments of the utility model is provided in conjunction with the appended drawings:

FIG. 1 is a schematic diagram of the overall structure of an AC brushless cutting tool according to the preferred embodiment of the present invention;

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

FIG. 3 is a cross-sectional view of the AC brushless cutting tool of FIG. 2 at another angle;

FIG. 4 is a schematic diagram of the AC brushless cutting tool shown in FIG. 1 with portions of the structure removed;

fig. 5 is an exploded view of the ac brushless cutting tool shown in fig. 1.

The meaning of the reference symbols in the figures:

100. electric circular saw 1, motor casing 11, motor

12. Motor shaft 13, end cover 14 and wind-shield ring

15. Air suction opening 16, air blowing opening 2 and gear box shell

21. Working head 22, speed reducing mechanism 23 and saw blade shield

3. Handle shell 31, control panel 33 and capacitor

34. A main handle 35, a first half-shell 36, a second half-shell

37. Air inlet 38, auxiliary handle 4 and front fan

5. Heat sink 6, rear fan 7, guide plate

[ detailed description of the utility model ]

The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationship, are based only on the orientation or positional relationship shown in the drawings and are merely for convenience in describing the present invention and for simplicity in 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 taken as limiting the present invention.

Referring to fig. 1, an ac brushless cutting tool according to the present invention is shown, in the preferred embodiment, the ac brushless cutting tool is an ac brushless electric circular saw 100, of course, the present application is not limited to the electric circular saw 100, and other ac brushless cutting tools with high power requirements can also refer to the design concept of the present application.

Referring to fig. 1 and 2, an electric circular saw 100 includes a housing, a motor 11 accommodated in the housing, a working head 21 driven by the motor 11, and a control board 31 connected to the motor 11, where the working head 21 is connected to an axial front end of the motor, the control board 31 controls start and stop of the motor 11, and the ac brushless cutting tool 100 further includes a front fan 4 located at the axial front end of the motor 11 and a rear fan 6 located at an axial rear end of the motor 11; the housing comprises a gear box housing 2 for accommodating the front fan 4 and the working head 21, a handle housing 3 for accommodating the control panel 31, and a motor housing 1 for accommodating the motor 11 and the rear fan 6, wherein the handle housing 3 is communicated with the gear box housing 2 and is provided with an air inlet 37 adjacent to the control panel 31, the motor 11 drives the front fan 4 to rotate, so that external air enters the handle housing 3 from the air inlet 37 and then flows into the gear box housing 2 after flowing through the control panel 31 to form a first air duct; the motor housing 1 is provided with a second air duct passing through the motor 11, and the first air duct and the second air duct are arranged independently of each other. In the present embodiment, the working head 21 is a circular saw blade, a saw blade guard 23 is provided on the outer cover of the circular saw blade, and the saw blade guard 23 is connected to the gear housing 2.

According to the electric circular saw 100 provided by the utility model, the front fan 4 is arranged at the front end of the motor shaft 12, the air inlet 37 is arranged at the position, close to the control plate 31, of the handle shell 3, the handle shell 3 is communicated with the interior of the gearbox shell 2, so that a first air channel from the air inlet 37 to the control plate 31 and then to the front fan 4 is formed, and the control plate 31 is positioned at the upstream of the first air channel, so that when external air flows in, the heat of the control plate 31 can be furthest taken away, and the heat dissipation effect of the control plate 31 is improved. The motor 11 is cooled by the rear fan 6 and the second air channel formed in the motor shell 1, which are arranged independently, so that the two air channels are independent and do not interfere with each other, and are respectively responsible for cooling the control board 31 and the motor 11, thereby improving the cooling effect; the first air channel from the handle shell 3 to the gearbox shell is short in distance and smooth in structure, air volume loss is reduced, and the heat dissipation effect of the control panel 31 is guaranteed.

In the embodiment, a transmission mechanism is further arranged between the motor 11 and the working head 21, the gear box shell 2 accommodates the working head 21, the transmission mechanism and the front fan 4, the gear box shell 2 comprises a front shell and a rear shell, the front shell and the rear shell are connected through screwing operation, and a joint gap generally exists between the front shell and the rear shell; in addition, there is also a mounting gap between the gearbox housing 2 and the working head 21, through which the cooling air flow is finally discharged to the outside.

Referring to fig. 1 and 3, the motor 11 has a motor shaft 12 extending in an axial direction, the control plate 31 is located below the motor shaft 12, and the air inlet 37 is oriented perpendicular to the axial direction of the motor shaft 12. The electric circular saw 100 further includes a guide plate 7 for resting on a work surface to guide a saw blade to cut along a traveling direction, a main handle 34 for holding is provided on the handle housing 3, in the present embodiment, the control plate 31 is provided in an area defined by the motor housing 1, the guide plate 7 and the handle in common, and the control plate 31 extends in a direction perpendicular to the motor shaft 12. The air inlet 37 is disposed on the handle housing 3, and the orientation is the same as the control board 31, i.e. the direction is perpendicular to the motor shaft 12 and is the same as the extending direction of the first air duct, so that the external air flow is more smooth when entering the first air duct from the air inlet 37, and the air volume loss is avoided.

With continued reference to fig. 3, the ac brushless cutting tool includes a heat sink 5 connected to the control board 31, the heat sink 5 is located in the handle housing and includes a heat dissipation surface connected to the control board 31 and a plurality of heat dissipation posts supporting the heat dissipation surface, and the air inlet 37 is disposed opposite to the heat sink 5. The heat sink 5 is generally made of a metal material, preferably a copper material, to provide better heat conduction. The control board 31 is supported on the heat dissipating surface, and the heat dissipated during the operation process is quickly absorbed by the heat dissipating surface, and then the heat is dissipated to the air by the heat dissipating surface through the heat dissipating columns arranged at intervals. Further, the front fan 4 is driven by the motor 11 to rotate and generate negative pressure, so that the external air flow flows from the air inlet 37 to the periphery of the front fan 4 through the first air duct, the control panel 31 is located at the upstream of the first air duct, and the air inlet 37 is arranged opposite to the heat sink 5, so that when the electric circular saw 100 performs a cutting task, the external air flow is continuously blown to the control panel 31 and the heat sink 5, the heat of the control panel 31 is taken away in time, and the operation effect of the control panel 31 is ensured.

Referring to fig. 1 and 3 again, the first air duct includes a handle air duct disposed in the handle housing 3 and a gear box air duct disposed in the gear box housing 2, the handle air duct flows through the control board 31 and the plurality of heat dissipation columns, and the gear box air duct rotates circumferentially along the outer edge of the front fan 4. In this embodiment, the handle air duct is located between the control board 31 and the bottom wall of the handle housing 3, in other words, the handle air duct is inserted between the plurality of heat-dissipating posts to take away more heat, and the gear box air duct is located inside the gear box housing 2 in the same direction as the rotation direction of the heat-dissipating fan, so that the first air duct formed by joining the handle air duct and the gear box air duct is perpendicular to the motor shaft 12.

Referring to fig. 4 and 5, the handle housing 3 includes a first half shell 35 adjacent to the gear housing 2 and a second half shell 36 adjacent to the motor housing 1, and the first half shell 35 and the second half shell 36 together form a receiving cavity for receiving the control board 31. The ac brushless electric circular saw 100 further includes a capacitor 33, the capacitor 33 is electrically connected to the control board 31, and in consideration of the center of gravity and the appearance of the electric circular saw 100, in the present embodiment, the capacitor 33 and the control board 31 are separately provided, the control board 31 is provided at the lower end portion of the handle, and the capacitor 33 is accommodated at the upper end portion of the handle at a position close to the sub-handle 38. The handle housing 3 is a split type housing, and during assembly, the first half-shell 35 is connected to the gear box housing 2, the control board 31 and the capacitor 33 are mounted on the first half-shell 35, the motor housing 1 is connected to the gear box housing 2 through the first half-shell 35, and finally the second half-shell 36 is aligned with the first half-shell 35 and locked through screws.

Referring to fig. 2 and 4, as shown in fig. 1, the second air duct includes a plurality of air suction openings 15 disposed on an outer periphery of the motor housing 1, and the air suction openings 15 are uniformly arranged on the outer periphery of the motor housing. Several inlet scoop 15 is the ring shape along the periphery of motor casing 1 and arranges, so, outside air current is 360 omnidirectionals and gets into motor casing 1 by the periphery of motor casing 1 to effectively dispel the heat to motor 11.

Referring to fig. 1, 2, and 4, the second air duct includes an air blowing opening 16 disposed on an end cover 13 of the end portion of the motor housing 1, and the motor 11 drives the rear fan 6 to rotate, so that external air enters the motor housing 1 through the air suction opening 15, and flows through the motor 11 and flows out through the air blowing opening 16. The end covers 13 are provided with grilles, air blowing ports 16 are formed between the grilles, and the heat dissipation air flow of the motor 11 is finally discharged through the end cover 13 positioned at the rear end of the motor shaft 12.

A wind blocking ring 14 sleeved on the periphery of the motor 11 is arranged in the motor housing 1, the wind blocking ring 14 is communicated with the air suction opening 15 and the air blowing opening 16, the wind blocking ring 14 limits a second air channel, and the second air channel is parallel to the motor shaft 12. The wind deflector 14 can guide the wind to pass through the gap between the stator and the rotor of the motor 11, which is beneficial to taking away the heat of the motor 11. Further, the motor 11 is an inner rotor brushless motor 11, the front fan 4 is a centrifugal fan, and the rear fan 6 is also a centrifugal fan.

In summary, the present invention provides an ac brushless cutting tool with dual air channels, wherein a front fan and a rear fan are respectively sleeved at the front end and the rear end of a motor shaft 12 of the tool for cooling and dissipating heat of a control board 31 and a motor 11, respectively, a first air channel between the front fan 4 and the control board 31 is short and smooth, so as to significantly reduce air loss, significantly enhance the heat dissipation effect of the control board 31, and a second air channel between the rear fan 6 and the motor 11 is specially used for cooling and dissipating heat of the motor 11, and the air channel path is also short and efficient, thereby facilitating heat dissipation of the motor 11. In a word, first wind channel and second wind channel mutually independent and perpendicular setting have exerted heat dissipation function separately high-efficiently, and simple structure does benefit to popularization and application.

The present invention is not limited to the above-described embodiments. One of ordinary skill in the art will readily recognize that there are numerous alternatives to the ac brushless cutting tool of the present invention without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An alternating current brushless cutting tool comprises a shell, a motor, a working head and a control panel, wherein the motor is accommodated in the shell, the working head is driven by the motor, the control panel is connected with the motor, the working head is connected to the axial front end of the motor, the control panel controls the starting and stopping of the motor, and the alternating current brushless cutting tool further comprises a front fan and a rear fan, the front fan is located at the axial front end of the motor, and the rear fan is located at the axial rear end of the motor; the method is characterized in that: the shell comprises a gear box shell for accommodating the front fan and the working head, a handle shell for accommodating the control panel and a motor shell for accommodating the motor and the rear fan, the handle shell is communicated with the gear box shell and is provided with an air inlet adjacent to the control panel, the motor drives the front fan to rotate, so that external air enters the handle shell from the air inlet and flows into the gear box shell after flowing through the control panel to form a first air channel; the motor shell is provided with a second air duct flowing through the motor, and the first air duct and the second air duct are arranged independently.

2. The ac brushless cutting tool of claim 1, wherein: the motor is provided with a motor shaft extending along the axial direction, the control plate is positioned below the motor shaft, and the direction of the air inlet is vertical to the axial direction of the motor shaft.

3. The ac brushless cutting tool of claim 2, wherein: exchange brushless cutting tool including connect in the radiating piece of control panel, the radiating piece is located in the handle casing and including connecting the cooling surface of control panel with support a plurality of heat dissipation posts of cooling surface, the air intake is just right radiating piece sets up.

4. The ac brushless cutting tool of claim 3, wherein: the first air duct comprises a handle air duct arranged in the handle shell and a gear box air duct arranged in the gear box shell, the handle air duct flows through the control panel and the heat dissipation columns, and the gear box air duct rotates along the circumferential direction of the outer edge of the front fan.

5. The ac brushless cutting tool of claim 1, wherein: the handle housing includes a first half shell adjacent the gearbox housing and a second half shell adjacent the motor housing that together form a receiving cavity that receives the control board.

6. The ac brushless cutting tool of claim 1, wherein: the second air duct comprises a plurality of air suction openings arranged on the periphery of the motor shell, and the plurality of air suction openings are uniformly distributed on the periphery of the motor shell.

7. The ac brushless cutting tool of claim 6, wherein: the second air duct comprises a blowing opening formed in an end cover of the end portion of the motor shell, the motor drives the rear fan to rotate, so that external air enters the motor shell from the air suction opening, flows through the motor and flows out from the blowing opening.

8. The ac brushless cutting tool of claim 7, wherein: the motor shell is internally provided with a wind blocking ring sleeved on the periphery of the motor, and the wind blocking ring is communicated with the air suction opening and the air blowing opening.

9. The ac brushless cutting tool of claim 1, wherein: the front fan and the rear fan are both centrifugal fans.