Electric circular saw

Abstract

The application provides an electric circular saw, comprising: a motor, comprising an output shaft rotating around a first axis; a housing assembly, comprising at least a first housing accommodating the motor; a shroud connected with the housing assembly; a fan connected to the output shaft and arranged in the first housing, the first housing comprising a vent for air flow to pass through; a control assembly electrically connected with the motor, used for controlling the operation of the motor; the electric circular saw further comprises: an air flow channel formed on the surface of the shroud, the control assembly is arranged to be at least partially exposed to the air flow channel, the air flow channel is in communication with the vent, so that at least part of the air flow generated by the fan passes through the air flow channel. The electric circular saw has good heat dissipation effect and simple and effective heat dissipation structure.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric tool, in particular to an electric circular saw. BACKGROUND

[0002] The electric circular saw is usually controlled by a controller to control the operation of the motor, and the temperature rise of the electric circular saw is high when it is heavily loaded, which is easy to damage the controller and affect the use of the electric circular saw. Therefore, how to achieve effective heat dissipation of the electric circular saw while making the structure of the electric circular saw simple and compact is a difficult problem to solve. SUMMARY

[0003] In order to solve the problems of the prior art, the purpose of the present application is to provide an electric circular saw which has good heat dissipation effect and simple and effective heat dissipation structure.

[0004] In order to achieve the above main application purpose, the present application provides an electric circular saw, comprising: a motor comprising an output shaft rotating around a first axis; a housing assembly comprising at least a first housing accommodating the motor; a shroud connected to the housing assembly; a fan connected to the output shaft and arranged in the first housing, the first housing comprising a ventilation opening for airflow to pass through; a control assembly electrically connected to the motor for controlling the operation of the motor; the electric circular saw further comprises: an airflow passage formed on the surface of the shroud, the control assembly is arranged to be at least partially exposed to the airflow passage, and the airflow passage is in communication with the ventilation opening, so that at least part of the airflow generated by the fan passes through the airflow passage.

[0005] Optionally, the housing assembly further comprises a second housing, and the airflow passage is formed between the second housing and the shroud.

[0006] Optionally, the control assembly comprises a controller and a box body accommodating the controller, and the box body is arranged at least partially in the airflow passage and directly or indirectly contacts the shroud.

[0007] Optionally, the control assembly further comprises a heat dissipation block arranged between the box body and the shroud, and the heat dissipation block respectively contacts the box body and the shroud.

[0008] Optionally, the control assembly comprises a controller and a box body accommodating the controller, and the box body is arranged in the airflow passage, and a heat dissipation gap is provided between the box body and the shroud.

[0009] Optionally, the control assembly comprises a controller and a box body accommodating the controller, and the airflow passage is arranged between the box body and the shroud, or arranged in the box body.

[0010] Optionally, the shroud forms a protruding rib on one side of the airflow passage.

[0011] Optionally, the first housing comprises: a motor accommodating portion for accommodating the motor;

[0012] The grip portion forms a handle for gripping, and the grip portion is fixedly connected to or integrally formed with the second housing.

[0013] Optionally, a vent is provided on the motor housing. The vent includes an air inlet and an air outlet. The air outlet is configured to communicate with the airflow channel, so that part of the airflow generated by the fan flows from the motor housing to the airflow channel.

[0014] Optionally, a vent is provided on the motor housing. The vent includes an air inlet and an air outlet. The air inlet is configured to communicate with the airflow channel, so that the negative pressure generated by the fan generates airflow within the airflow channel.

[0015] Optionally, the circular saw also includes: a base plate connected to the guard, the base plate including a sawing indicator for displaying the position of the saw blade;

[0016] The second housing forms an opening for the airflow channel to flow out, and the opening guides part of the airflow in the airflow channel to blow towards the sawing indicator.

[0017] Beneficial effects: This invention uses the airflow generated by the motor fan to dissipate heat from the controller, which can effectively improve the heat dissipation efficiency of the electric circular saw. It also uses a protective cover to absorb some of the heat generated by the controller, so there is no need to add an additional heat dissipation structure. This achieves efficient heat dissipation and improves the overall performance of the electric circular saw. Attached Figure Description

[0018] Figure 1 This is a perspective structural diagram of an electric circular saw according to one embodiment of the present invention;

[0019] Figure 2 This is the present invention. Figure 1 A plan view of the electric circular saw in the image;

[0020] Figure 3 This is the present invention. Figure 1 A schematic diagram of the motor of the electric circular saw;

[0021] Figure 4 This is the present invention. Figure 1 A schematic diagram of the internal structure of an electric circular saw;

[0022] Figure 5 This is the present invention. Figure 1 A schematic diagram of the internal structure and airflow channels of the control components of an electric circular saw.

[0023] Figure 6 This is a schematic diagram of the structure of an electric circular saw according to one embodiment of the present invention;

[0024] Figure 7 This is the present invention. Figure 1 Internal structure diagram of the control components of the electric circular saw;

[0025] Figure 8is a control assembly internal structure diagram of an electric circular saw of an embodiment of the present application;

[0026] Figure 9 is a structure diagram of a motor and control assembly of an electric circular saw of an embodiment of the present application. DETAILED DESCRIPTION

[0027] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] In the description of the present embodiment, the terms "upper", "lower", "right", and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0030] Reference Figures 1 to 3The present application provides an electric circular saw 100, which comprises a motor 120, a saw blade, a power supply device 180, a shroud 130 and a base plate 170. The power supply device 180 is capable of supplying power to the motor 120, which comprises an output shaft rotating around a first axis, and the motor 120 is capable of driving the saw blade to rotate to cut a workpiece, and the saw blade is usually a circular saw blade. The electric circular saw 100 can be an alternating current power tool, such as the power supply device 180 is an alternating current power supply device. The electric circular saw 100 can also be a direct current power tool, such as the power supply device 180 can be a battery pack. The saw blade is arranged to pass through the base plate 170, and the base plate 170 is flat to contact the workpiece to be cut, thereby assisting the user to use the electric circular saw 100 to cut. The electric circular saw 100 is further provided with the shroud 130, and the shroud 130 is arranged to at least partially surround the saw blade in the circumferential direction, and part of the saw blade is capable of being arranged in the shroud 130, thereby improving the safety of the electric circular saw 100.

[0031] The electric circular saw 100 further comprises a housing assembly 110 connected to the base plate 170. The base plate 170 and the housing assembly 110 are capable of rotating relative to each other, so that the saw blade is capable of being inclined relative to the base plate 170 to achieve bevel cutting of the electric circular saw 100. The housing assembly 110 at least comprises a first housing 111 for accommodating the motor 120, and the first housing 111 is a two-piece structure to facilitate the manufacture and installation of the electric circular saw. Referring to Figure 4 The first housing 111 is further provided with a fan 140 connected to the output shaft, and the fan 140 is capable of being driven to rotate when the motor 120 rotates, thereby generating a cooling airflow to cool the motor 120 and prevent the performance of the motor 120 from being reduced due to excessive temperature rise. Figure 2 and Figure 4 The first housing 111 is provided with ventilation openings for the airflow to flow in and out of the first housing 111, and the airflow is capable of flowing in and out of the first housing 111 from different ventilation openings according to the direction of the airflow generated by the fan 140.

[0032] The electric circular saw 100 further comprises a control assembly 150 electrically connected to the battery pack and the motor 120 for controlling the operation of the motor 120. The electric circular saw 100 is provided with an airflow channel 200 formed on the surface of the shroud 130, and the control assembly 150 is arranged to be at least partially exposed to the airflow channel 200, and the airflow channel 200 is in communication with the ventilation openings, so that at least part of the airflow generated by the fan 140 passes through the airflow channel 200. Here, the airflow channel 200 is in communication with the ventilation openings, which means that the ventilation openings are arranged opposite to the airflow channel 200, so that part of the airflow in the airflow channel is capable of flowing into the airflow channel 200. Optionally, the distance between the ventilation openings and the inlet of the airflow channel is close, and the shortest distance between the ventilation openings and the inlet of the airflow channel is arranged to be less than or equal to 15 cm and greater than or equal to 0 cm. Here, the shortest distance between the two refers to the shortest air path length of the airflow flowing from the ventilation openings to the airflow channel.

[0033] When the electric circular saw 100 is running, the fan 140 generates the cooling air flow to cool the motor 120, and the cooling air flow flows into the air flow channel 200 through the vent, flows through the surface of the control assembly 150 in the air flow channel 200, and carries away part of the heat of the control assembly 150 through convection, and can be transmitted to the shroud 130, thereby rapidly cooling the control assembly 150. The shroud 130 can be made of a material with high thermal conductivity, such as an aluminum alloy. Optionally, the thermal conductivity of the material of the shroud 130 is greater than or equal to 100 W / (m·K).

[0034] The housing assembly 110 further includes a second housing 160 arranged on the side of the shroud 130, and the air flow channel 200 is formed between the second housing 160 and the shroud 130. The control assembly 150 is arranged between the second housing 160 and the shroud 130. The control assembly 150 includes a controller 151 and a box body 152 accommodating the controller 151, and the box body 152 is at least partially arranged in the air flow channel 200, and the heat generated by the controller 151 is carried away by the cooling air flow in the air flow channel 200 through the box body 152. The controller 151 can be a power board for controlling the power of the motor. The box body 152 is in direct or indirect contact with the shroud 130, and the shroud 130 indirectly increases the heat dissipation volume of the controller 151, and the heat generated by the control assembly 150 is transmitted to the shroud 130 through heat conduction, thereby rapidly cooling the control assembly 150. The shroud 130 increases the effective heat dissipation surface area of the control assembly 150, and since the shroud 130 is arranged exposedly, directly contacts with the air outside, increases the effective heat dissipation area, and improves the air convection heat dissipation effect, the heat dissipation efficiency of the control assembly 150 can be further improved. The gap is also formed in the box body 152, so that the cooling air flow in the air flow channel 200 can pass through the surface or the gap of the box body 152, thereby improving the heat dissipation speed. Optionally, the box body 152 is in direct contact with the shroud 130, and the heat of the control assembly 150 can be directly transmitted to the shroud 130 through heat conduction, and the shroud 130 with a larger volume disperses part of the heat of the control assembly 150, and relatively increases the effective heat dissipation surface area of the control assembly 150.

[0035] Optionally, referring to Figure 7 The control assembly 150 further includes a heat dissipation block 153 arranged between the box body 152 and the shroud 130, and the heat dissipation block 153 is in surface contact with the box body 152 and the shroud 130 respectively, and the heat conduction between the box body 152 and the shroud is realized through the heat dissipation block 153, thereby indirectly increasing the effective heat dissipation surface area of the box body 152, and dispersing part of the heat of the box body 152 through the shroud 130 with a larger volume. The area of the contact surface between the heat dissipation block 153 and the shroud 130 is greater than or equal to 1000 square millimeters and less than or equal to 3000 square millimeters, thereby ensuring the heat dissipation effect. Optionally, the heat dissipation block 153 can be made of a material with high thermal conductivity.

[0036] The first housing 111 includes a motor housing 121 and a grip 122. The motor housing 121 houses the motor 120, and the grip 122 forms a handle for the user to hold. The handle is positioned above the electric circular saw 100 relative to the base plate 170. The motor housing 121 is connected to the protective cover 130, and is disposed on the side of the protective cover 130 such that the motor 120 disposed in the motor housing 121 is located on the side of the protective cover 130, and the first axis of the output shaft of the motor 120 is perpendicular to the surface of the protective cover 130. Optionally, the ventilation opening of the motor housing 121 includes a first air inlet 1211 and a second air inlet, and an air outlet 1122. The first air inlet 1211 and the second air inlet are respectively formed on the side and front end of the motor housing 121, so that part of the cooling airflow can flow through the motor 120 from the first air inlet 1211 along the direction of the first axis, and part of the cooling airflow can flow through the motor 120 from the second air inlet along the radial direction of the first axis. The air outlet 1122 is located at the rear end of the motor 120 relative to the second air inlet, so that the airflow can flow out from the motor housing 121 in the radial direction along the first axis.

[0037] The circular saw provided in this embodiment also includes an angle adjuster 190. A base plate 170 can contact the workpiece, and a clearance opening is provided on the base plate 170. The saw blade passes through the clearance opening. The angle adjuster 190 is mounted on the base plate 170 and fixedly connected to the protective cover 130. The angle adjuster 190 can drive the protective cover to rotate to adjust the angle between the saw blade and the vertical plane. Since the protective cover 130 is fixedly connected to the first housing 111, and the motor 120 is fixedly mounted inside the first housing 111, and the saw blade is connected to the motor 120, when the angle adjuster 190 drives the protective cover to rotate, the saw blade can rotate together and form a certain angle with the vertical plane, thus enabling cutting at different cutting angles. Of course, in other embodiments, the angle adjuster 190 can also be directly fixedly connected to the first housing 111, and the angle between the saw blade and the vertical plane can be adjusted by driving the first housing 111 to rotate.

[0038] Optionally, such as Figure 7 As shown, in this embodiment, the angle adjuster 190 includes an angle indicator plate 191, an adjusting member, and a connecting plate. The angle indicator plate 191 has an adjusting groove that extends along the direction of the angle indicator numbers on the angle indicator plate 191. The adjusting member slidably passes through the adjusting groove and connects to the connecting plate, which is fixedly connected to the protective cover 130. By sliding the adjusting member along the adjusting groove on the angle indicator plate 191, the connecting plate can be rotated, thereby rotating the protective cover and causing the saw blade to form a certain angle with the vertical plane. Of course, in other embodiments, the connecting plate can also be directly fixedly connected to the first housing 111.

[0039] The shroud 130 further comprises a movable shroud rotatably connected with the shroud 130 to cover or expose the lower part of the saw blade. When the electric circular saw is not in use, the movable shroud can cover the lower part of the saw blade to prevent the saw blade from hurting the operator, thereby improving the safety of the electric circular saw.

[0040] The second housing 160 forms an airflow passage 200 connected with the air outlet 1122, so that the airflow discharged from the motor accommodating portion 121 flows into the airflow passage 200, thereby increasing the airflow passing through the control assembly 150 and effectively utilizing the cooling airflow generated by the fan 140 to cool the motor 120 and the control assembly 150. Alternatively, the holding portion 122 and the second housing 160 are fixedly connected or integrally formed, i.e., the airflow passage 200 is formed in the first housing 111 itself. Alternatively, the holding portion 122 and the second housing 160 can be fixedly connected by screws or other connecting members.

[0041] The second housing 160 further forms an opening of the airflow passage 200, one end of the airflow passage 200 is connected with the air vent of the motor accommodating portion 121, and the other end has an opening connected with the outside, so that the cooling airflow can be discharged to the outside through the opening after flowing from the motor accommodating portion 121 to the airflow passage 200. Alternatively, the opening is directed away from the handle, so that the direction of the cooling airflow is away from the handle, thereby reducing the interference of the hot airflow on the user. As shown in Figure 1 , the control assembly can be arranged above the motor accommodating portion. In the present embodiment, the fan forms a high-speed airflow in the airflow passage, which can generate an airflow less than or equal to 45 m / s, such as 40 m / s. Alternatively, Figure 6 , the control assembly can also be arranged in front of the motor accommodating portion.

[0042] The bottom plate further comprises a sawing indication opening 192 for displaying the current sawing position of the saw blade. When the electric circular saw is running, dust will be generated on the workpiece near the sawing indication opening 192, which is not conducive to the user's understanding of the current cutting position of the electric circular saw, thereby making it inconvenient to accurately cut the workpiece. The opening of the airflow passage is arranged to direct towards the sawing indication opening 192, so that after the cooling airflow is discharged from the opening of the airflow passage, it can blow away the dust near the sawing indication opening 192, thereby improving the accuracy of the user's operation of the electric circular saw. The structure of the above electric circular saw can simultaneously realize the cooling of the motor and the control assembly and the dust removal of the sawing indication opening 192 by using only the airflow generated by the fan, which is simple in structure, compact in size, and improves the working performance and portability of the electric circular saw.

[0043] Optionally, the air flow channel 200 is arranged between the box 152 and the shroud 130. The box 152 and the shroud 130 are fixedly connected, and there is a gap between the box 152 and the shroud 130 to form the air flow channel 200. The air flow channel 200 is connected with the air outlet 1122 of the motor accommodating portion 121, so that the heat dissipation air flow in the motor accommodating portion can flow into the air flow channel 200, i.e., between the box 152 and the shroud 130. Optionally, the box 152 can be provided with heat dissipation fins 1521, and the shroud 130 is provided with a protrusion 131 on one side of the air flow channel 200, so as to improve the heat dissipation efficiency.

[0044] In an embodiment of the present application, referring to Figure 8 The control assembly 150a includes a controller and a box 152a accommodating the controller. The box 152a is arranged in the air flow channel 200a, and a heat dissipation gap is arranged between the box 152a and the shroud 130a, i.e., the box 152a and the shroud 130a are not in direct contact, or the contact area between the two is small, such as the contact area between the box 152a and the shroud 130a is less than 1000 square millimeters. The box 152a is provided with heat dissipation fins 1521a on the side facing the heat dissipation gap. The heat dissipation fins 1521a are a plurality of heat dissipation elements protruding from the surface of the box 152a. The heat dissipation fins 1521a are exposed to the air flow channel 200a, which can increase the effective heat dissipation area of the box 152a and improve the heat dissipation efficiency.

[0045] Optionally, the shroud 130a is provided with a protrusion 131a on one side of the air flow channel 200a to guide the air flow path. The protrusion 131a protrudes from the surface of the air flow channel 200a and is provided with a plurality of protrusions 131a. The protrusion 131a is arranged opposite the heat dissipation fins 1521a and is located in the air flow channel 200a. The plurality of heat dissipation fins 1521a and the protrusion 131a form an air flow path for guiding air flow, and the arrangement of the protrusion 131a can also increase the heat absorption area of the shroud 130a, thereby accelerating the heat dissipation of the control assembly 150a.

[0046] In an embodiment, referring to Figure 9The air inlet of the motor accommodating portion is arranged in communication with the airflow channel, so that the negative pressure generated by the fan generates airflow in the airflow channel. The other end of the airflow channel is provided with an opening. When the electric circular saw is running, the fan is running to generate negative pressure, so that the airflow flows from the opening into the airflow channel, carries away part of the heat of the control assembly 150b, and then flows to the motor accommodating portion through the air inlet, flows through the motor 120b, and then flows out from the air outlet of the motor accommodating portion. The fan forms a high-speed airflow in the airflow channel, which can generate an airflow greater than or equal to 5 m / s and less than or equal to 20 m / s. Optionally, the shroud forms a convex rib on one side of the airflow channel. When the motor is running, the airflow generated by the motor can enter the airflow channel from the inlet of the airflow channel to dissipate heat from the control assembly located in the airflow channel or on one side of the airflow channel, and the convex rib guides the airflow and accelerates heat exchange, thereby improving the heat dissipation efficiency of the electric circular saw.

[0047] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the above-mentioned embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. An electric circular saw characterized by comprising: The electric circular saw comprises: a motor including an output shaft rotating around a first axis; a housing assembly including at least a first housing accommodating the motor; a shroud connected to the housing assembly; a fan connected to the output shaft and arranged in the first housing, the first housing including a vent for air flow to pass through; a control assembly electrically connected to the motor for controlling operation of the motor; characterized in that: the electric circular saw further comprises: an air flow passage formed on a surface of the shroud, the control assembly being arranged at least partially exposed to the air flow passage, the air flow passage being in communication with the vent so that at least part of the air flow generated by the fan passes through the air flow passage; wherein the control assembly is located outside the first housing.

2. The electric circular saw of claim 1, wherein: the housing assembly further comprises a second housing, the air flow passage being formed between the second housing and the shroud.

3. The electric circular saw according to claim 2, characterized in that: the control assembly includes a controller and a box body accommodating the controller, the box body being arranged at least partially in the air flow passage, the box body being in direct or indirect contact with the shroud.

4. The electric circular saw according to claim 3, characterized in that: the control assembly further includes a heat dissipation block arranged between the box body and the shroud, the heat dissipation block being in contact with the box body and the shroud respectively.

5. The electric circular saw according to claim 2, characterized in that: the control assembly includes a controller and a box body accommodating the controller, the box body being arranged in the air flow passage, a heat dissipation gap being provided between the box body and the shroud.

6. The electric circular saw according to claim 1, characterized in that: the control assembly includes a controller and a box body accommodating the controller, the air flow passage being arranged between the box body and the shroud, the air flow passage being arranged in the box body.

7. The electric circular saw of claims 1 or 5 or 6, wherein: the shroud forms a protrusion on a side of the air flow passage.

8. The electric circular saw according to any one of claims 2 to 5, wherein the first housing includes: a motor accommodating portion for accommodating the motor; a holding portion forming a handle for holding, the holding portion being fixedly connected or integrally formed with the second housing.

9. The electric circular saw according to claim 8, characterized in that: the vent is arranged on the motor accommodating portion, the vent including an air inlet and an air outlet, the air outlet being arranged in communication with the air flow passage so that part of the air flow generated by the fan flows from the motor accommodating portion to the air flow passage.

10. The electric circular saw according to claim 6, characterized in that: the vent is arranged on the motor accommodating portion, the vent including an air inlet and an air outlet, the air inlet being arranged in communication with the air flow passage so that negative pressure generated by the fan generates air flow in the air flow passage.

11. The electric circular saw according to claim 2, characterized in that: the electric circular saw further comprises: a saw blade detachably mounted to the housing assembly; a bottom plate connected to the shroud, the bottom plate including a sawing indication opening indicating a cutting position of the saw blade; the second housing forms an opening for the air flow passage to flow out, the opening guiding part of the air flow in the air flow passage to blow towards the sawing indication opening.

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