Electric circular saw convenient to assemble and capable of efficiently dissipating heat

Abstract

The utility model belongs to the technical field of electric tools, and particularly relates to an electric circular saw convenient to assemble and capable of efficiently dissipating heat, the electric circular saw comprises a motor, the motor comprises an output shaft rotating around the axial direction of the motor and a housing covering the periphery of the motor, and an airflow channel is formed in the housing; the fan is arranged at one end of the opening of the housing and is connected with the output shaft; the shell assembly comprises a first shell and a second shell which are oppositely arranged and connected, and at least part of the fan and at least part of the motor are contained in the first shell; the control assembly is arranged in the second shell and connected with the end, away from the opening, of the cover shell, the control assembly comprises a heat dissipation shell and a circuit board assembly, the heat dissipation shell is located between the circuit board assembly and the cover shell, the second shell is provided with an air inlet allowing airflow to circulate, and the air inlet communicates with the airflow channel; at least part of airflow generated by the fan sequentially flows through the circuit board assembly, the heat dissipation shell and the airflow channel. Efficient heat dissipation can be achieved, and the overall performance of the electric circular saw is improved.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and more specifically, to an electric circular saw that is easy to assemble and has efficient heat dissipation. Background Technology

[0002] A circular saw is a tool that uses a transmission mechanism to drive a saw blade for sawing operations. It is suitable for cutting wood, fiberboard, plastics, flexible cables, and similar materials. Circular saws typically use a controller to control the motor for linear cutting to obtain flat workpieces. However, in related technologies, the controller's heat dissipation is often poor, which can easily damage the controller and affect the use of the circular saw. Utility Model Content

[0003] The purpose of this application is to provide an electric circular saw that is easy to assemble and has efficient heat dissipation, which can achieve efficient heat dissipation and improve the overall performance of the electric circular saw.

[0004] To this end, this application proposes an electric circular saw that is easy to assemble and has efficient heat dissipation, comprising: a motor, including an output shaft that rotates about its own axis and a cover housing surrounding its own periphery, wherein an airflow channel is formed inside the cover housing; a fan, disposed at one open end of the cover housing and connected to the output shaft; a housing assembly, including a first housing and a second housing disposed opposite to and connected to each other, wherein at least a portion of the fan and the motor are housed in the first housing; and a control assembly, disposed in the second housing and connected to the end of the cover housing away from the opening, the control assembly including a heat sink and a circuit board assembly, wherein the heat sink is located between the circuit board assembly and the cover housing, and the second housing is provided with an air inlet for airflow, the air inlet communicating with the airflow channel, such that at least a portion of the airflow generated by the fan flows sequentially through the circuit board assembly, the heat sink, and the airflow channel.

[0005] The electric circular saw provided according to the embodiments of this application includes a motor, a fan, a housing assembly, and a control assembly. An airflow channel is formed inside the motor housing. The fan is disposed at one end of the opening of the housing and connected to the output shaft. At least a portion of the fan and the motor are housed in the first housing of the housing assembly. The control assembly is disposed in the second housing of the housing assembly. The control assembly includes a heat sink and a circuit board assembly, with the heat sink located between the circuit board assembly and the housing. An air inlet for airflow is provided on the second housing, and the air inlet communicates with the airflow channel. Thus, at least a portion of the airflow entering from the air inlet flows sequentially through the circuit board assembly, the heat sink, and the airflow channel under the drive of the fan. Since the distance between the air inlet and the inlet of the airflow channel is relatively short, heat loss can be reduced, the heat generated by the control assembly can be quickly removed, and the heat sink can dissipate heat from the circuit board assembly, thereby achieving efficient heat dissipation and improving the overall performance of the electric circular saw.

[0006] In addition, the electric circular saw according to this application may also have the following additional technical features:

[0007] In some embodiments of this application, the end of the cover away from the opening is provided with spaced support portions and buckles, the support portions being used to support the heat dissipation shell, and the buckles being used to snap into the heat dissipation shell.

[0008] In some embodiments of this application, the heat sink is provided with a plurality of protrusions spaced apart on the side facing the cover, and a receiving cavity is provided on the side of the heat sink away from the plurality of protrusions; the circuit board assembly includes a circuit board and a heat sink disposed on the circuit board, and the circuit board is accommodated in the receiving cavity.

[0009] In some embodiments of this application, the electric circular saw further includes a reducer and a saw blade. The reducer includes a reduction shaft and a reduction gear disposed on the outer periphery of the reduction shaft. A drive gear is disposed on the outer periphery of the output shaft. The drive gear shaft meshes with the reduction gear. The reduction shaft is connected to the saw blade to drive the saw blade to rotate.

[0010] In some embodiments of this application, the electric circular saw further includes a static cover and a base plate. The static cover is connected between the first housing and the reducer and is used to cover at least part of the saw blade in the circumferential direction. The static cover also forms an air outlet that communicates with a fan. The base plate is connected to the static cover and has a clearance opening through which the saw blade passes.

[0011] In some embodiments of this application, the electric circular saw further includes a movable guard, which is rotatably connected to a stationary guard. The movable guard is used to enclose at least a portion of the saw blade or to expose at least a portion of the saw blade.

[0012] In some embodiments of this application, the electric circular saw further includes a first angle adjuster, which is disposed on the base plate and fixedly connected to one axial side of the static guard. The first angle adjuster is used to drive the static guard to rotate in order to adjust the cutting depth of the saw blade.

[0013] In some embodiments of this application, the electric circular saw further includes a second angle adjuster, which is disposed on the base plate and fixedly connected to one radial side of the static guard. The second angle adjuster is used to adjust the cutting angle of the saw blade relative to the base plate.

[0014] In some embodiments of this application, a scale is provided on one edge of the base plate that is perpendicular to the plane where the saw blade is located.

[0015] In some embodiments of this application, a portion of the motor is housed in a first housing, and another portion of the motor is housed in a second housing. The first and second housings are disposed opposite each other at one end, which together form a handle for gripping.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0019] Figure 1 This is a schematic diagram of the structure of an electric circular saw according to an embodiment of this application at an angle;

[0020] Figure 2 for Figure 1 The diagram shows the structure of an electric circular saw with the second housing removed.

[0021] Figure 3 for Figure 2 A schematic diagram of the partial exploded structure of the central control component;

[0022] Figure 4 This is a schematic diagram of the structure of an electric circular saw according to an embodiment of this application at another angle;

[0023] Figure 5 This is a schematic diagram of the structure of an electric circular saw with its protective cover removed according to an embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the structure of an electric circular saw with the housing removed according to an embodiment of this application.

[0025] The labels in the attached diagram are as follows:

[0026] 100. Electric circular saw;

[0027] 1. Motor; 11. Output shaft; 12. Cover; 121. Opening; 122. Support; 123. Buckle; 13. Airflow channel;

[0028] 2. Fan;

[0029] 3. Housing assembly; 31. First housing; 32. Second housing; 321. Air inlet; 33. Handle; 34. Power supply;

[0030] 4. Control components; 41. Heat sink; 411. Protrusion; 412. Receiving cavity; 42. Circuit board assembly; 421. Circuit board; 422. Heat sink;

[0031] 5. Speed ​​reducer;

[0032] 6. Saw blade; 71. Static guard; 711. Air outlet; 72. Dynamic guard; 8. Base plate; 81. Clearance opening; 82. Length indicator numbers;

[0033] 9. First angle adjuster; 91. Angle indicator plate; 911. Adjustment groove; 92. Adjustment component; 93. Connecting plate;

[0034] 10. Second angle adjuster. Detailed Implementation

[0035] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0036] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented as "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0039] Figure 1 This is a schematic diagram of the structure of an electric circular saw according to an embodiment of this application along an angle. Figure 2 for Figure 1 The diagram shows the structure of an electric circular saw with the second housing removed.

[0040] See Figure 1 and Figure 2 This application provides an electric circular saw 100 that is easy to assemble and can dissipate heat efficiently, including a motor 1, a fan 2, a housing assembly 3, and a control assembly 4.

[0041] The motor 1 includes an output shaft 11 that rotates about its own axis and a housing 12 that covers its outer periphery, with an airflow channel 13 formed inside the housing 12. The motor 1 can drive the saw blade 6 to rotate to cut the workpiece, and the saw blade 6 is usually a circular saw.

[0042] The fan 2 is located at one end of the opening 121 of the housing 12 and connected to the output shaft 11. When the motor 1 rotates, it can drive the fan 2 to rotate through the output shaft 11, thereby generating a cooling airflow to dissipate heat from the motor 1 and prevent the motor 1 from degrading due to excessive temperature rise.

[0043] The housing assembly 3 includes a first housing 31 and a second housing 32 that are disposed opposite to and connected to each other. At least a portion of the fan 2 and the motor 1 are housed in the first housing 31. The first housing 31 and the second housing 32 may both be of a split-half structure to facilitate the manufacture and installation of the electric circular saw 100.

[0044] The control component 4 is disposed inside the second housing 32 and connected to the end of the cover 12 away from the opening 121. The control component 4 includes a heat sink 41 and a circuit board assembly 42, with the heat sink 41 located between the circuit board assembly 42 and the cover 12. The second housing 32 is provided with an air inlet 321 for airflow, which is connected to the airflow channel 13, so that at least part of the airflow generated by the fan 2 flows sequentially through the circuit board assembly 42, the heat sink 41 and the airflow channel 13.

[0045] In this embodiment, the control component 4 is used to control the operation of the motor 1. The airflow channel 13 is connected to the air inlet 321, meaning that the air inlet 321 and the inlet of the airflow channel 13 are arranged opposite each other, so that at least part of the airflow entering from the air inlet 321 can flow into the airflow channel 13. Optionally, the distance between the air inlet 321 and the inlet of the airflow channel 13 is relatively short. The shortest distance between the air inlet 321 and the inlet of the airflow channel can be less than or equal to 15cm and greater than or equal to 0cm. Here, the shortest distance between the two refers to the shortest airflow path length from the air inlet 321 to the airflow channel 13. Since the second housing 32 is in direct contact with the outside air, the air convection heat dissipation effect can be improved. Moreover, the close distance between the air inlet 321 of the second housing 32 and the inlet of the airflow channel 13 can reduce the loss of cooling capacity, so that most of the airflow entering from the air inlet 321 can flow through the control component 4 and the airflow channel 13 in sequence under the drive of the fan 2, thereby dissipating heat from the control component 4 and the motor 1.

[0046] In addition, the control component 4 includes a heat sink 41 and a circuit board assembly 42, with the heat sink 41 located between the circuit board assembly 42 and the cover 12. The heat sink 41 can be made of a material with high thermal conductivity, such as aluminum alloy. The heat sink 41 can also dissipate and cool the heat generated by the circuit board assembly 42, thereby achieving efficient heat dissipation.

[0047] The electric circular saw 100 provided according to the embodiments of this application includes a motor 1, a fan 2, a housing assembly 3, and a control assembly 4. An airflow channel 13 is formed inside the housing 12 of the motor 1. The fan 2 is disposed at one end of the opening 121 of the housing 12 and connected to the output shaft 11. At least a portion of both the fan 2 and the motor 1 is housed within the first housing 31 of the housing assembly 3. The control assembly 4 is disposed within the second housing 32 of the housing assembly 3. The control assembly 4 includes a heat sink 41 and a circuit board assembly 42, with the heat sink 41 located between the circuit board assembly 42 and the housing 12. The second housing 32 is provided with an air inlet 321 for airflow, which is connected to the airflow channel 13. Thus, at least part of the airflow entering from the air inlet 321 flows sequentially through the circuit board assembly 42, the heat sink 41 and the airflow channel 13 under the drive of the fan 2. Since the air inlet 321 is close to the inlet of the airflow channel 13, the loss of cold energy can be reduced, the heat generated by the control component 4 can be quickly removed, and the circuit board assembly 42 can be cooled through the heat sink 41, which can achieve efficient heat dissipation and improve the overall performance of the electric circular saw 100.

[0048] Figure 3 for Figure 2 A schematic diagram of the partial decomposition structure of the control component.

[0049] In some embodiments, the end of the cover 12 away from the opening 121 is provided with a spaced support portion 122 and a buckle 123. The support portion 122 is used to support the heat sink 41, and the buckle 123 is used to snap into the heat sink 41.

[0050] like Figure 3 As shown, the end of the cover 12 away from the opening 121 is provided with two spaced-apart support portions 122 and two snap fasteners 123. The two support portions 122 are arranged opposite to each other, and the two snap fasteners 123 are arranged opposite to each other. The cover 12 is detachably connected to the heat sink 41 of the control component 4 through the snap fasteners 123, and the heat sink 41 is supported by the support portions 122, thereby realizing the detachable connection between the control component 4 and the cover 12. Compared with the related technology where the circuit board assembly 42 is connected to the motor 1 by screws and then soldered, the assembly is simple, the manufacturing cost is low, and it is easy to maintain.

[0051] In some embodiments, the heat sink 41 is provided with a plurality of protrusions 411 spaced apart on the side facing the cover 12, and the heat sink 41 is provided with a receiving cavity 412 on the side away from the plurality of protrusions 411; the circuit board assembly 42 includes a circuit board 421 and a heat sink 422 disposed on the circuit board 421, and the circuit board 421 is accommodated in the receiving cavity 412.

[0052] like Figure 3As shown, the heat sink 422 of the circuit board assembly 42 includes multiple fins arranged in parallel, which can increase the effective heat dissipation surface area of ​​the heat sink 41 and improve the heat dissipation effect on the circuit board 421. The circuit board 421 is housed in the receiving cavity 412 of the heat sink 41. On the side of the heat sink 41 away from the receiving cavity 412, multiple protrusions 411 are provided at intervals. The multiple protrusions 411 can be arranged in multiple rows and columns at intervals. The arrangement of multiple protrusions 411 increases the effective heat dissipation area of ​​the heat sink 41. The gap between adjacent protrusions 411 is used for heat dissipation, thereby further dissipating heat from the circuit board 421 and improving the heat dissipation effect of the control assembly 4.

[0053] Figure 4 This is a schematic diagram of the structure of an electric circular saw according to an embodiment of this application at another angle. Figure 5 This is a schematic diagram of the structure of an electric circular saw with the protective cover removed according to an embodiment of this application.

[0054] In some embodiments, the electric circular saw 100 further includes a reducer 5 and a saw blade 6. The reducer 5 includes a reduction shaft and a reduction gear disposed on the outer periphery of the reduction shaft. A drive gear is disposed on the outer periphery of the output shaft 11. The drive gear shaft meshes with the reduction gear. The reduction shaft is connected to the saw blade 6 to drive the saw blade 6 to rotate.

[0055] like Figure 4 and Figure 5 As shown, in one example, a drive gear is provided on the outer periphery of the output shaft 11 of the motor 1. The reducer 5 includes a reduction shaft and a reduction gear disposed on the outer periphery of the reduction shaft. The number of teeth on the reduction gear is greater than the number of teeth on the drive gear. The drive gear meshes with the reduction gear to reduce the speed of the motor 1. The reduction shaft of the reducer 5 is connected to the saw blade 6 to drive the saw blade 6 to rotate. In other examples, the reducer 5 can also be, for example, a pulley assembly, a sprocket assembly, etc., and the reduction ratio of the reducer 5 depends on the actual application.

[0056] In some embodiments, the electric circular saw 100 further includes a static cover 71 and a base plate 8. The static cover 71 is connected between the first housing 31 and the reducer 5 and is used to cover at least part of the saw blade 6 in the circumferential direction. The static cover 71 also forms an air outlet 711 that communicates with the fan 2. The base plate 8 is connected to the static cover 71 and is provided with a clearance opening 81. The saw blade 6 passes through the clearance opening 81.

[0057] like Figure 4 and Figure 5As shown, the saw blade 6 passes through the clearance opening 81 on the base plate 8. The flat surface of the base plate 8 is used to contact the workpiece to be cut, assisting the user in cutting with the electric circular saw 100. The static shield 71 covers at least part of the saw blade 6 circumferentially, improving safety when operating the electric circular saw 100. The static shield 71 also forms an air outlet 711 connected to the fan 2. Through the air outlet 711, the debris generated during the sawing process can be blown away, preventing debris from accumulating between the saw blade 6 and the workpiece and affecting the sawing accuracy.

[0058] Thus, when the circular saw 100 is running, the fan 2 generates negative pressure, causing airflow to flow from the air inlet 321 through the control component 4, carrying away some of the heat from the control component 4, before entering the interior of the airflow channel 13, flowing through the motor 1, and then exiting from the air outlet 711. Because the airflow channel 13 has a cylindrical structure, the fan 2 can generate a high-speed airflow within the airflow channel 13, reducing energy loss and generating an airflow greater than or equal to 5 m / s and less than or equal to 20 m / s. Therefore, the circular saw 100 of this embodiment utilizes only the airflow generated by the fan 2 to simultaneously dissipate heat from the motor 1 and the control component 4, as well as clean up debris. Its simple structure and compact size improve the working performance and portability of the circular saw 100.

[0059] In some embodiments, the electric circular saw 100 further includes a movable guard 72, which is rotatably connected to a stationary guard 71. The movable guard 72 is used to cover at least a portion of the saw blade 6 or to expose at least a portion of the saw blade 6.

[0060] like Figure 5 As shown, the movable guard 72 is rotatably connected to the stationary guard 71. When the circular saw 100 is working, the movable guard 72 covers the lower part of the saw blade 6 or exposes the lower part of the saw blade 6 for sawing operations. When the circular saw 100 is not working, the movable guard 72 can cover the lower part of the saw blade 6 to prevent the saw blade 6 from accidentally injuring the operator and improve the safety of the circular saw 100.

[0061] Figure 6 This is a schematic diagram of the structure of an electric circular saw with the housing removed according to an embodiment of this application.

[0062] In some embodiments, the electric circular saw 100 further includes a first angle adjuster 9, which is disposed on the base plate 8 and fixedly connected to one axial side of the static guard 71. The first angle adjuster 9 is used to drive the static guard 71 to rotate in order to adjust the cutting depth of the saw blade 6.

[0063] like Figure 6As shown, since the static shield 71 is connected between the first housing 31 and the reducer 5, and the saw blade 6 is connected to the reducer 5, when the first angle adjuster 9 drives the static shield 71 to rotate, the saw blade 6 can rotate together and form a certain angle with the vertical plane, thereby enabling cutting at different cutting depths. Of course, in other embodiments, the first angle adjuster 9 can also be directly fixedly connected to the first housing 31, and the angle between the saw blade 6 and the vertical plane can be adjusted by driving the first housing 31 to rotate.

[0064] In some embodiments, the first angle adjuster 9 includes an angle indicator plate 91, an adjusting member 92, and a connecting plate 93. The angle indicator plate 91 has an adjusting groove 911 extending along the direction of the angle indicator numbers on the angle indicator plate 91. The adjusting member 92 slidably passes through the adjusting groove 911 and connects to the connecting plate 93. The connecting plate 93 is fixedly connected to the protective cover. By sliding the adjusting member 92 along the adjusting groove 911 on the angle indicator plate 91, the connecting plate 93 can be rotated, thereby causing the stationary protective cover 71 to rotate, so that the saw blade 6 forms a certain angle with the vertical plane. Of course, in other embodiments, the connecting plate 93 can also be directly fixedly connected to the first housing 31.

[0065] In some embodiments, the electric circular saw 100 further includes a second angle adjuster 10, which is disposed on the base plate 8 and fixedly connected to one radial side of the static guard 71. The second angle adjuster 10 is used to adjust the cutting angle of the saw blade 6 relative to the base plate 8.

[0066] like Figure 4 As shown, the base plate 8 can rotate relative to the static cover 71 via the second angle adjuster 10, so that the saw blade 6 can be tilted relative to the base plate 8 to achieve the beveling of the electric circular saw 100.

[0067] In some embodiments, a length indicator number 82 is provided on one side edge of the base plate 8 that is perpendicular to the plane where the saw blade 6 is located.

[0068] like Figure 4 As shown, the edge of the base plate 8 perpendicular to the plane where the saw blade 6 is located can be used as a level to draw lines on the workpiece to be measured. This edge is provided with a length indicator number 82 to display the size of the workpiece, eliminating the need for separate measurement with a tape measure, saving sawing time and improving work efficiency.

[0069] In some embodiments, a portion of the motor 1 is housed in a first housing 31, and another portion of the motor 1 is housed in a second housing 32. The first housing 31 and the second housing 32 are disposed opposite to each other and together form a handle 33 for gripping.

[0070] like Figure 1As shown, the first housing 31 and the second housing 32 can each be a split structure for easy assembly. The opposite ends of the first housing 31 and the second housing 32 together form a handle 33 for gripping. The handle 33 is positioned above the base plate 8 of the circular saw 100 for easy user gripping. A power supply 34 is located at the rear end of the handle 33 and provides power to the motor 1, enabling the motor 1 to drive the saw blade 6 to rotate and cut the workpiece. If the circular saw 100 is an AC power tool, then the power supply 34 is an AC power source. Alternatively, if the circular saw 100 is a DC power tool, then the power supply 34 can be a battery pack.

[0071] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric circular saw which is easy to assemble and has high heat dissipation efficiency, characterized in that, The electric circular saw comprises a motor, a fan, a housing assembly, and a control assembly. The motor comprises an output shaft rotating around its own axis and a cover shell covering the outer periphery of the motor, and a gas flow channel is formed in the cover shell. The fan is arranged at one end of the cover shell and connected with the output shaft. The housing assembly comprises a first housing and a second housing arranged oppositely and connected with each other, and the fan and at least part of the motor are accommodated in the first housing. The control assembly is arranged in the second housing and connected with the end of the cover shell away from the opening, and the control assembly comprises a heat dissipation shell and a circuit board assembly, and the heat dissipation shell is located between the circuit board assembly and the cover shell. An air inlet is arranged on the second housing for the gas flow to pass through, and the air inlet is communicated with the gas flow channel, so that at least part of the gas flow generated by the fan flows through the circuit board assembly, the heat dissipation shell and the gas flow channel in sequence.

2. The electric circular saw according to claim 1, characterized in that, The end of the cover shell away from the opening is provided with spaced support portions for supporting the heat dissipation shell and buckles for clamping connection with the heat dissipation shell.

3. The electric circular saw of claim 2, wherein, The heat dissipation shell is provided with a plurality of convex portions arranged at intervals on the side facing the cover shell, and the side of the heat dissipation shell away from the plurality of convex portions is provided with a receiving cavity. The circuit board assembly comprises a circuit board and a heat dissipation member arranged on the circuit board, and the circuit board is accommodated in the receiving cavity.

4. The electric circular saw of claim 1, wherein, The electric circular saw further comprises a speed reducer and a saw blade.

5. The electric circular saw of claim 4, wherein, The speed reducer comprises a speed reduction shaft and a speed reduction gear arranged on the outer periphery of the speed reduction shaft.

6. The electric circular saw of claim 5, wherein, The outer periphery of the output shaft is provided with a driving gear engaged with the speed reduction gear.

7. The electric circular saw of claim 5, wherein, The speed reduction shaft is connected with the saw blade to drive the saw blade to rotate.

8. The electric circular saw of claim 5, wherein, The electric circular saw further comprises a static guard and a bottom plate.

9. The electric circular saw of claim 5, wherein, The static guard is connected between the first housing and the speed reducer and covers at least part of the saw blade in the circumferential direction.

10. The electric circular saw of claim 1, wherein, The static guard is further provided with an air outlet communicated with the fan. The bottom plate is connected with the static guard and provided with an avoiding opening through which the saw blade passes. The electric circular saw further comprises a dynamic guard. The dynamic guard is rotationally connected with the static guard and covers at least part of the saw blade or exposes at least part of the saw blade. The electric circular saw further comprises a first angle adjuster. The first angle adjuster is arranged on the bottom plate and fixedly connected with the axial side of the static guard. The first angle adjuster drives the static guard to rotate to adjust the cutting depth of the saw blade. The electric circular saw further comprises a second angle adjuster. The second angle adjuster is arranged on the bottom plate and fixedly connected with the radial side of the static guard. The second angle adjuster adjusts the cutting angle of the saw blade relative to the bottom plate. The side edge of the bottom plate perpendicular to the plane where the saw blade is located is provided with a scale. Part of the motor is accommodated in the first housing, and the other part of the motor is accommodated in the second housing. The first housing and the second housing oppositely arranged end jointly form a handle for holding.

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