CN113733249A

CN113733249A - Electric tool

Info

Publication number: CN113733249A
Application number: CN202111116763.9A
Authority: CN
Inventors: 盛佳荣; 黄建平
Original assignee: Jiangsu Dartek Technology Co Ltd
Current assignee: Jiangsu Dartek Technology Co Ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2021-12-03
Anticipated expiration: 2041-09-23
Also published as: CN113733249B

Abstract

The invention discloses an electric tool, which comprises a machine shell, a motor, a controller, a fan and an air guide piece, wherein a first mounting cavity for accommodating the motor and a second mounting cavity for accommodating the controller are formed in the machine shell. The fan is sleeved on the output shaft of the motor and is configured to be driven by the motor to rotate so as to generate airflow in the first mounting cavity. The air guide piece is installed in the first installation cavity and at least partially encloses the fan, the air guide piece is matched with the machine shell to form an air guide channel, and air flow of the first installation cavity at least partially flows to the second installation cavity through the air guide channel. The electric tool has the function of directly radiating the controller through the air brought by the operation of the fan, so that the controller is not easy to protect the temperature, and the efficiency and the user experience degree during operation are improved.

Description

Electric tool

Technical Field

The present invention relates to a heat dissipation mechanism, and more particularly to an electric tool with a heat dissipation mechanism for a controller.

Background

At present, the existing direct current circular saw mainly sucks external wind into the machine when a motor operates, so that the heat dissipation effect on a controller is achieved. At present, some direct current circular saws can put a controller into an air inlet of a machine shell, the structure can play a role in heat dissipation of the controller, but the overall appearance and the internal space of the machine are greatly limited, so that the overall appearance of the machine is larger. The direct current circular saw in addition is put the controller near power position department, and this kind of structure is because the controller is far away apart from motor position, and the machine during operation inhales into the amount of wind on the small side, leads to not too ideal to the radiating effect of controller, and the machine overload operation controller temperature rise is too fast often, very easily will temperature protection stop work, wait to open again after the controller cooling often need very long time, great reduction work efficiency and user's experience degree.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide an electric tool, which has the function of directly radiating heat of a controller through wind brought by the operation of a fan, can make the controller difficult to protect the temperature, and improves the efficiency and the user experience degree during operation.

In order to achieve the above object, the present invention provides an electric tool, which includes a housing, a motor, a controller, a fan, and an air guide, wherein a first mounting cavity for accommodating the motor and a second mounting cavity for accommodating the controller are formed in the housing.

The fan is sleeved on an output shaft of the motor and is configured to be driven to rotate by the motor to generate airflow in the first mounting cavity.

The air guide piece is installed in the first installation cavity and at least partially encloses the fan, the air guide piece is matched with the machine shell to form an air guide channel, and air flow in the first installation cavity at least partially flows to the second installation cavity through the air guide channel.

In one or more embodiments, the air guide has a guide groove, and a portion of the casing is configured to cover the guide groove to form the air guide passage.

In one or more embodiments, the casing includes a first member, a second member, and a third member, the first member and the third member cooperate to form the first mounting cavity, and the first member and the second member cooperate to form the second mounting cavity, wherein the second member has a cover portion configured to cover the guide groove to form the air guide passage.

In one or more embodiments, a ventilation hole is formed in the middle of the air guide, an output shaft of the motor penetrates through the ventilation hole, and a gap through which at least a part of the air flow can pass is formed between the output shaft and the ventilation hole.

In one or more embodiments, the air guide member has an annular air guide wall, and the air guide wall is curved in a radial direction thereof.

In one or more embodiments, the air guide member is attached to the first attachment chamber by being assembled to the housing, and the air guide wall extends downstream of the airflow when the air guide member is attached to the first attachment chamber.

In one or more embodiments, the guide groove is formed by recessing a part of the air guide wall toward the upstream side of the airflow.

In one or more embodiments, the power tool further includes a battery pack, and the housing further has an adapter portion adapted to mount the battery pack, the adapter portion forming a portion of a wall of the second mounting cavity.

In one or more embodiments, the controller includes a circuit board, and the battery pack has a plurality of cells, and an axis of each of the cells is substantially parallel to a plane of the circuit board.

In one or more embodiments, the wall of the second mounting cavity is provided with an air outlet, and a direction of the airflow flowing out of the air outlet is substantially consistent with a direction in which the plane of the circuit board extends towards the air outlet.

Compared with the prior art, the electric tool has the function of directly radiating the controller through the wind brought by the operation of the fan, so that the controller is not easy to protect the temperature, and the efficiency and the user experience degree during operation are improved.

The electric tool can limit the appearance of the whole electric tool, and the whole electric tool is designed to be smaller and more compact, thereby meeting the market demand.

Drawings

Fig. 1 is a sectional view of an electric power tool according to an embodiment of the present invention.

Fig. 2 is a component-separated view of a power tool according to an embodiment of the present invention.

Fig. 3 is a schematic structural layout diagram of an electric power tool according to an embodiment of the present invention.

Fig. 4 is a schematic perspective view of a power tool according to an embodiment of the present invention.

Fig. 5 is a schematic view of an air guide in the heat dissipation mechanism of the electric power tool according to the embodiment of the present invention.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1 to 4, an embodiment of the present invention provides an electric power tool including a housing 10, a motor 20, a controller 30, a heat dissipation mechanism 40, and a battery pack 50. The motor 20, the controller 30, the heat dissipation mechanism 40, and the battery pack 50 are disposed in the casing 10.

The cabinet 10 includes a first member 11, a second member 12, and a third member 13.

The first member 11 and the third member 13 cooperate to form a first mounting cavity 14, and the motor 20 and the heat dissipation mechanism 40 are disposed in the first mounting cavity 14. An air inlet 111 is formed on the first member 11 where the first mounting cavity 14 is located, and a first air outlet is formed on the third member 13 where the first mounting cavity 14 is located.

The first member 11 and the second member 12 cooperate to form a second mounting cavity 15 and a handle portion 16 for holding, and the controller 30 is disposed in the second mounting cavity 15 and connected to the motor 20 for controlling the operation of the motor 20. Wherein the second mounting cavity 15 is located between the first mounting cavity 14 and the handle portion 16. The second component 12 with the second mounting cavity 15 is provided with a second air outlet 122.

The first member 11 and the second member 12 are also matched to form an adapting part 17, the adapting part 17 is used for installing the battery pack 50, and the adapting part 17 forms a part of the wall of the second installation cavity 15.

The second member 12 has a cover portion 121 extending to the first mounting cavity 14, the cover portion 121 being for engaging the heat dissipating mechanism 40.

The third member 13 is a gear box, and a saw blade of a circular saw is disposed in the third member 13, and the saw blade is connected to an output shaft 21 of the motor 20 and is driven to rotate by the motor 20.

The heat dissipation mechanism 40 is disposed at an end of the motor 20 away from the air inlet 111 on the casing 10. The heat dissipation mechanism 40 includes a fan 41 and an air guide 42.

The fan 41 is fixedly sleeved on the output shaft 21 of the motor 20, and the fan 41 can be driven by the motor 20 to rotate so as to generate cooling air flow flowing through the motor 20 in the first mounting cavity 14.

The air guide 42 is disposed between the fan 41 and the motor 20, and at least partially surrounds the fan 41. The air guide 42 cooperates with the cover 121 of the second member 12 of the casing 10 to form an air guide passage, and the air flow in the first mounting chamber 14 flows to the second mounting chamber 15 at least partially through the air guide passage.

As shown in fig. 4 and 5, the air guide 42 is formed with a vent hole 421 and a guide groove 422. The air inlet 111, the vent 421 and the first air outlet are communicated to form a first heat dissipation channel for dissipating heat of the motor 20. The fan 41 rotates to make wind enter from the wind inlet 111, generating a cooling air flow; the cooling airflow is guided by the vent 421 and flows through the first heat dissipation channel, and then partially flows out from the first air outlet of the third member 13. The ventilation hole 421, the guide groove 422 and the second air outlet 122 are communicated to form a second heat dissipation channel for dissipating heat of the controller 30. Part of the cooling airflow passing through the ventilation hole 421 flows through the second heat dissipation channel under the guidance of the guide groove 422, and then flows out from the second air outlet 122.

The ventilation hole 421 is opened in the middle of the air guide 42, and the output shaft 21 of the motor 20 passes through the ventilation hole 421 and has a gap with the hole wall of the ventilation hole 421 for at least a part of the airflow to pass through.

The air guide 42 has an annular air guide wall 423, and the air guide wall 423 has a certain curvature in a radial direction thereof, that is, the air guide wall 423 is disposed in an arc shape. The air guide 42 is mounted in the first mounting chamber 14 by being assembled with the casing 10. In an embodiment, a fixing hole 4231 is formed in the position of the air guide wall 423 near the ventilation hole 421, and the air guide 42 is locked into the fixing hole 4231 by a screw to realize a fixed connection with the casing 10. When the air guide 42 is fixed to the casing 10, the air guide wall 423 extends downstream of the airflow.

The guide groove 422 is configured as a concave groove structure in which a part of the air guide wall 423 of the air guide 42 is recessed toward the upstream side of the airflow. The cover 121 of the second member 12 can cover the guide groove 422 to form an air guide passage. The air guide channel is a part of the second heat dissipation channel.

The controller 30 includes a circuit board 31. The battery pack 50 has a plurality of cells, and the axis of each cell is substantially parallel to the plane of the circuit board 31. The direction of the airflow flowing out from the second air outlet 121 of the second mounting cavity 15 is substantially the same as the direction in which the plane of the circuit board 31 extends toward the second air outlet 121.

When the electric tool is working, the motor 20 drives the fan 41 to operate, the air outside the electric tool is sucked from the air inlet 111 of the housing 10, the heat dissipation treatment is firstly performed on the motor 20, the heat inside the motor 20 is rotated by the fan 41, and a part of the air is exhausted through the first air outlet of the third member 13 under the action of the air guide 42. Meanwhile, since the guide groove 422 is formed in the air guide 42, the cover 121 of the second member 12 can cover the guide groove 422 of the air guide 42 to form another air duct, and the remaining air can enter the second mounting cavity 15 where the controller 30 is located through the air duct, so that the wind energy can directly blow toward the controller 30 and finally flow out through the second air outlet 122 of the second mounting cavity 15.

Compared with the prior art, the controller heat dissipation mechanism of the electric tool has the function of directly dissipating heat of the controller through wind brought by the operation of the fan, so that the controller is not easy to protect the temperature, and the efficiency and the user experience degree during operation are improved.

According to the controller heat dissipation mechanism of the electric tool, the controller is directly dissipated through wind energy generated by the fan, and the structure enables the air outlet on the second mounting cavity where the controller is located to be changed into the air outlet from the conventional air inlet. Although the wind discharged by the fan carries the heat of the motor, the temperature tends to be stable, and meanwhile, the temperature generated by the heat of the motor is often lower than the value set by the temperature protection of the controller, even if the electric tool is in a load working condition, because the wind guide channel flowing through the second mounting cavity where the controller is located is smaller, the wind speed of the wind flowing to the controller is larger than that of the wind entering from the air inlet, and the temperature of the controller is generally slowly increased upwards at the high wind speed. Therefore, after the work of one battery pack 50 is finished, the phenomenon that the electric tool is stopped due to temperature protection cannot occur, so that the working efficiency and the user experience of the whole machine are improved.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A power tool including a housing (10), a motor (20), and a controller (30), a first mounting chamber (11) accommodating the motor (20) and a second mounting chamber (12) accommodating the controller (30) being formed in the housing (10), characterized by further comprising:

a fan (41) sleeved on the output shaft (21) of the motor (20) and configured to be driven by the motor (20) to rotate so as to generate air flow in the first mounting cavity;

and the air guide piece (42) is arranged in the first installation cavity and at least partially surrounds the fan (41), the air guide piece and the machine shell (10) are matched to form an air guide channel, and the air flow in the first installation cavity at least partially flows to the second installation cavity through the air guide channel.

2. A power tool according to claim 1, wherein: the air guide (42) has a guide groove (422), and a part of the casing (10) is arranged to cover the guide groove (422) to form the air guide passage.

3. A power tool according to claim 2, wherein: the casing (10) comprises a first member (11), a second member (12) and a third member (13), wherein the first member (11) and the third member (13) are matched to form the first installation cavity, the first member (11) and the second member (12) are matched to form the second installation cavity, the second member (12) is provided with a cover part (121), and the cover part (121) is configured to cover the guide groove (422) to form the air guide channel.

4. A power tool according to claim 3, wherein: a ventilation hole (421) is formed in the middle of the air guide piece (42), an output shaft (21) of the motor (20) penetrates through the ventilation hole (421), and a gap through which at least a part of air flow can pass is formed between the output shaft (21) and the ventilation hole (421).

5. An electric power tool as claimed in claim 4, characterized in that the air guide member (42) has an annular air guide wall (423), and the air guide wall (423) is curved in a radial direction thereof.

6. The electric power tool as claimed in claim 5, wherein said air guide member (42) is mounted in said first mounting chamber by being assembled with said housing (10), and said air guide wall (423) extends downstream of the air flow when said air guide member (42) is mounted in said first mounting chamber.

7. The electric power tool as claimed in claim 6, wherein the guide groove (422) is formed by a portion of the air guide wall (423) being recessed toward an upstream side of the air flow.

8. An electric power tool according to any one of claims 1 to 7, wherein: the electric tool further comprises a battery pack (50), and the housing (10) further comprises an adapting part (17) suitable for installing the battery pack (50), wherein the adapting part forms a part of the wall of the second installation cavity.

9. A power tool according to claim 8, wherein: the controller (30) comprises a circuit board (31), and the battery pack (50) is provided with a plurality of battery cells, and the axes of the battery cells are generally parallel to the plane of the circuit board.

10. A power tool according to claim 9, wherein: an air outlet is formed in the wall of the second mounting cavity, and the direction of airflow flowing out of the air outlet is generally consistent with the direction of the plane of the circuit board extending towards the air outlet.