Electric tool

Abstract

The utility model discloses an electric tool. The electric tool comprises a shell; the motor comprises a driving end for outputting power and a tail end opposite to the driving end; the impeller is fixedly arranged at the driving end; the control panel is arranged on the radial outer side of the motor stator iron core, the control panel comprises a substrate and components arranged on the substrate, at least part of the components are arranged on the plate face, away from the stator iron core, of the substrate, and a communicated air passing gap is formed between spaces located on the two sides of the plate face of the substrate; the air guide structure comprises an air guide ring arranged around the impeller and an air outlet formed in the air guide ring, and the air guide ring is arranged between the impeller and the control panel in a closed mode; and the first air inlet structure is arranged on the shell and located on the side, away from the motor, of the control panel, and airflow entering from the first air inlet structure cools the control panel, passes through the air passing gap and flows out from the air outlet. According to the electric tool, the heat dissipation effect of the control panel can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric tools, and in particular relates to an electric tool with a control panel heat dissipation duct. Background Art

[0002] Handheld power tools, such as hand drills, use motors to output rotational power, and control boards are connected to the motors to control the operation of the motors. Existing motors are usually brushless motors, and the control boards have high power and generate a lot of heat when running.

[0003] In order to dissipate heat from the control board, the conventional electric tool uses the method of directly applying the airflow blown out by the fan on the motor shaft to the control board. Since the airflow blown out by the fan is the airflow after cooling the motor, the airflow temperature is high, so the cooling effect on the control board is not good.

[0004] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0005] Therefore, the utility model aims to solve the technical problem that the control panel of the electric tool in the prior art has a poor heat dissipation effect.

[0006] In order to solve the above technical problems, the utility model provides an electric tool, comprising:

[0007] case;

[0008] A motor, disposed in the housing, comprising a driving end for outputting power and a tail end opposite to the driving end;

[0009] An impeller, fixedly disposed on the driving end;

[0010] A control board is arranged on the radial outer side of the stator core of the motor, the control board comprises a substrate and components arranged on the substrate, at least part of the components are arranged on the surface of the substrate away from the stator core, and a connected air gap is provided between the spaces on both sides of the surface of the substrate;

[0011] An air guide structure, comprising an air guide ring arranged around the impeller and an air outlet opened on the air guide ring, wherein the air guide ring is closed and arranged between the impeller and the control board to block the airflow blown out from the impeller from flowing to the control board;

[0012] The first air inlet structure is arranged on the shell and is located on a side of the control board away from the motor. The airflow entering from the first air inlet structure cools the control board, passes through the wind gap, and flows out from the air outlet.

[0013] Preferably, the control board further includes a power control area for controlling the power of the motor, the power control area is located on the board surface of the control board facing away from the motor, and the first air inlet structure is arranged adjacent to the power control area.

[0014] Preferably, the control panel includes a proximal end relatively close to the tail end, the power control zone is located at the proximal end of the control panel, at least part of the wind gap is formed between the proximal end and the shell, and the airflow flowing through the power control zone passes through the wind gap and finally flows out to the outside from the air outlet.

[0015] Preferably, the control board is arranged parallel to the axis of the motor, and the projection of the motor on the board surface of the control board covers at least 50% of the power control area.

[0016] Preferably, the first air inlet structure includes a first air inlet and a baffle arranged inside the first air inlet, at least a portion of the baffle is spaced apart from the first air inlet, and the baffle at least partially blocks the first air inlet to prevent foreign matter from entering the shell through the first air inlet.

[0017] Preferably, the first air inlet structure further includes a partition separating the first air inlet, and the partition separates the first air inlet into at least two sub-air inlets.

[0018] Preferably, the baffle includes a closed edge and an open edge, the closed edge is closed and connected to the shell to guide the direction of the airflow, the open edge is spaced apart from the shell to form an airflow outlet, the open edge is located on the side of the baffle close to the control panel, the airflow outlet faces the component, and the airflow flowing in from the first air inlet is guided by the baffle to the airflow outlet.

[0019] Preferably, the baffle has an airflow guiding surface facing the first air inlet, the airflow guiding surface is a curved surface, and the airflow guiding surface gradually moves away from the first air inlet along the airflow entry direction.

[0020] Preferably, the first air inlet structure is symmetrically arranged on both sides of the shell.

[0021] Preferably, a portion of the air guide ring is formed by an outer side wall of the shell, and another portion is formed by convex ribs on an inner side wall of the shell, and the air outlet is arranged on the outer side wall of the shell.

[0022] The technical solution provided by the utility model has the following advantages:

[0023] The electric tool provided by the utility model has a first air inlet structure for heat dissipation of the control panel on the housing, an air guide structure is arranged around the impeller, the first air inlet structure is located on the side of the control panel away from the motor, and the air guide structure is closed between the impeller and the control panel to block the airflow blown out from the impeller from flowing to the control panel, and the airflow entering from the first air inlet structure cools the control panel, passes through the air gap, and flows out from the air outlet. The heat dissipation of the control panel uses external cold air, rather than the hot airflow after the heat dissipation of the motor, so the heat dissipation effect of the control panel can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the electric tool provided by the embodiment of the utility model;

[0026] Figure 2 for Figure 1 An enlarged structural schematic diagram of the m region of the three-dimensional structural schematic diagram of the electric tool shown;

[0027] Figure 3 A schematic diagram of the internal structure of a hidden first half shell of an electric tool provided by an embodiment of the utility model;

[0028] Figure 4 A schematic diagram of the three-dimensional structure of a first half shell of an electric tool provided in one embodiment of the utility model;

[0029] Figure 5 for Figure 4 An enlarged structural schematic diagram of the s region of the three-dimensional structural schematic diagram of the first half shell of the electric tool shown;

[0030] Figure 6 for Figure 3 The illustrated diagram is a three-dimensional structural diagram of a hidden first half shell of the electric tool from one perspective. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0033] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0034] Example 1

[0035] This embodiment provides an electric tool. Figure 1 This is a three-dimensional structural diagram of the electric tool provided by the embodiment of the utility model. Figure 2 for Figure 1 The enlarged structural diagram of the m area of ​​the three-dimensional structural diagram of the electric tool shown in FIG. Figure 3 This is a schematic diagram of the internal structure of the electric tool in a specific embodiment in which the first half shell is hidden. Figure 1 and Figure 3 The electric tool includes a housing 10 , a motor 20 , an impeller 30 and a control panel 40 .

[0036] The housing 10 is the outer shell of the electric tool, and a receiving cavity is formed inside. The motor 20, the impeller 30 and the control panel 40 are all received in the housing 10. Specifically, the housing 10 is in the shape of a handheld gun, including a main body 17 and a gripping portion 18 connected to or integrally formed with the main body 17. The outer surface of the gripping portion 18 forms a gripping area for gripping, and the gripping portion 18 has a gripping centerline, and the gripping area surrounds the gripping centerline. The main body 17 has a main body centerline, and the gripping centerline is set at an angle with the main body centerline, and the angle is not zero. In normal operation, a person's hand grasps the gripping portion 18, and the main body 17 is located on the side of the base of the operator's gripping hand.

[0037] In a specific embodiment, the housing 10 is a left and right half-shell structure. Figure 4 This is a three-dimensional structural diagram of the first half shell of the electric tool provided by an embodiment of the utility model. Figure 3 and Figure 4 As shown, the housing 10 includes a first half shell 15 and a second half shell 16 that are matched with each other. The matching surfaces of the first half shell 15 and the second half shell 16 are roughly a plane, and the housing 10 is roughly symmetrical about the plane. The first half shell 15 and the second half shell 16 are fixed by bolts after matching, and a receiving cavity is formed between the two half shells.

[0038] In this embodiment, the motor 20 and the impeller 30 are both disposed on the main body 17. The motor 20 includes a driving end for outputting power and a tail end opposite to the driving end. The impeller 30 is fixedly disposed on the driving end of the motor 20. Specifically, the impeller 30 is coaxially disposed with the motor 20, and the axis of the motor 20 is substantially colinear with the center line of the main body. Figure 1 As shown, the electric tool further includes a driving head 70, which is used to be combined with the working head to perform the working task, and the driving end is connected to the driving head 70 to drive the driving head 70 and the working head to operate. For the purpose of convenience of explanation, the main body 17 is defined as the front end of the driving head 70, and the opposite end is defined as the rear end, and the gripping portion 18 is defined as the upper end of the main body 17, and the opposite end is defined as the lower end.

[0039] According to the different working tasks performed by the working head, the electric tools are divided into various types. In a specific embodiment, the electric tools can be electric drills, electric screwdrivers or electric wrenches. Figure 1 The electric tool in the embodiment shown is an electric drill, and the working head matched therewith is a drill bit, which performs the drilling task. The utility model is described by taking the electric drill as an example, but it cannot be understood as a limitation of the utility model.

[0040] The impeller 30 includes a back plate 31 and blades 33 disposed on one side of the back plate 31. The blades 33 are disposed around the center of the back plate 31, with gaps between adjacent blades 33, and the blades 33 are located on the side of the back plate 31 close to the motor 20. When the impeller 30 rotates, negative pressure is formed, forming a cooling airflow to dissipate heat from the motor 20 and the control board 40.

[0041] For details, see Figure 6 As shown, the motor 20 includes a stator core 21, a stator end plate 23, a stator coil (not shown), and a wire hooking frame 25 fixedly arranged on the stator end plate 23. The stator end plate 23 is relatively fixed to the two end sides of the stator core 21, and the stator coil is wound on the stator end plate 23. The wire hooking frame 25 is fixedly arranged on the outer side of the stator core 21, specifically on the radial outer side of the stator core 21. The wire hooking frame 25 is relatively fixed to the stator end plate 23, thereby, the stator core 21, the stator end plate 23, and the wire hooking frame 25 are fixed to form an integrated structure. At the same time, the wire hooking frame 25 is electrically connected to the stator coil.

[0042] The control board 40 is arranged on the radial outer side of the stator core 21. In this embodiment, the control board 40 is fixedly arranged on the wire hook frame 25 and is fixed to the stator core 21 through the wire hook frame 25. Specifically, the control board 40 includes a substrate 41 and electronic components (referred to as components) arranged on the substrate 41. The substrate 41 includes a plate surface facing away from the stator core 21, which is defined as a first plate surface 43, and the plate surface opposite to the first plate surface 43 is a second plate surface (not shown). The second plate surface faces one side of the stator core 21, and the first plate surface 43 faces away from the stator core 21. In order to reduce the heat effect of the motor 20 on the components arranged on the substrate 41, in this embodiment, all components are arranged on the plate surface of the substrate 41 facing away from the stator core 21, that is, all components are arranged on the first plate surface 43, which can ensure the service life of the components and reduce the probability of over-temperature damage. In other embodiments, some components can also be arranged on the second plate surface. Preferably, it is arranged in an area of ​​the second plate surface away from the motor and the impeller.

[0043] The control board 40 divides the receiving cavity into two spaces, and a connected air gap is provided between the spaces on both sides of the board surface of the substrate 41, so that air flows from one side of the control board to the other side, forming a heat dissipation airflow for the components. Specifically, the air gap may include a through hole provided on the control board, or may include a gap formed between the control board and the housing, which is not limited here.

[0044] The housing 10 is also provided with an air guiding structure for guiding the direction of air flow. Figure 4 1 is a schematic diagram of the three-dimensional structure of the first half shell 15 of the electric tool provided in an embodiment. Specifically, the second half shell 16 is substantially symmetrical with the first half shell 15 about the mating surface, so the structure of the second half shell 16 is substantially the same as that of the first half shell 15, which can be seen in FIG. Figure 4 The structure of the first half shell 15. That is, Figure 4 The figure shows a half of the wind guide structure formed on the first half shell 15, and the other half of the wind guide structure is symmetrically formed on the second half shell 16. The wind guide structure formed after the first half shell 15 and the second half shell 16 are matched is roughly annular and surrounds the circumference of the impeller 30. Figure 4 The wind guide structure is described, and the wind guide structure provided on the second half shell 16 is not repeated. Figure 4As shown, the air guide structure includes an air guide ring 111 arranged around the impeller 30 and an air outlet 112 opened on the air guide ring 111. The air outlet 112 connects the inside of the air guide ring with the external environment and is used to discharge the airflow thrown out of the impeller 30 to the outside. The air guide ring 111 is closed between the impeller 30 and the control board 40. The airflow radially outflowing from the impeller 30 is blocked by the closed structure of the air guide ring 111, so it will not directly blow to the surface of the control board, so as to achieve the purpose of blocking the airflow blown from the impeller from flowing to the control board, and reduce the temperature influence of the hot airflow flowing through the motor on the control board.

[0045] Specifically, a part of the air guide ring 111 is formed by the outer wall of the shell 10, and the other part is formed by the convex ribs of the inner wall of the shell 10. The air outlet 112 is arranged at the outer wall of the shell, connecting the outside and the inside of the air guide ring, so as to facilitate the airflow radially thrown out of the impeller to flow out. More specifically, the inner wall of the shell 10 protrudes inward to form the front end plate and the rear end plate of the air guide ring 111. The front end plate and the rear end plate are relatively spaced apart along the axial direction of the impeller 30, and the inner wall of the shell between the front end plate, the rear end plate and the front and rear end plates together form the air guide ring 111. The end plate close to the motor side is the front end plate, and the end plate away from the motor side is the rear end plate. Among them, the middle part of the front end plate has an airflow inlet, and the airflow flowing through the motor 20 enters the interior of the air guide ring through the airflow inlet, is driven by the impeller 30, and is discharged to the outside from the air outlet 112.

[0046] The housing 10 is also provided with a first air inlet structure 12 for allowing external airflow to enter the receiving chamber to cool the control board 40. The first air inlet structure 12 is located on the side of the control board 40 away from the motor. The airflow entering from the first air inlet structure 12 cools the control board 40, passes through the air gap, and flows out from the air outlet 112. In other words, the first air inlet structure 12 is located on the side of the first board surface 43 of the control board 40. The airflow entering from the first air inlet structure 12 passes through the air gap and flows to the other side of the control board 40, and finally flows out from the air outlet 112 to achieve heat dissipation of the control board.

[0047] The electric tool provided in this embodiment has a first air inlet structure for heat dissipation of the control board arranged on the housing, an air guide structure arranged circumferentially of the impeller, the first air inlet structure being located on the side of the control board away from the motor, and the air guide structure being arranged enclosed between the impeller and the control board to block the airflow blown out of the impeller from flowing to the control board. The heat dissipation of the control board is carried out by using external cold air, rather than the hot airflow after the heat dissipation of the motor, so the heat dissipation effect of the control board can be improved.

[0048] In a specific embodiment, the electric tool further includes a trigger 61 disposed on the grip portion 18 and a control body 63 located in the grip portion 18. The trigger 61 is disposed on the front side of the grip portion 18, and is used for a human hand to operate to trigger the control body 63 to control the start and stop of the electric tool. In the extension direction of the grip center line of the grip portion 18, the trigger 61 is disposed in the middle area of ​​the grip portion 13, and the grip portion 18 also includes an upper area above the trigger 61 and a lower area below the trigger 61. Among them, the upper area is adjacent to the main body 11, and the upper area, the middle area and the lower area are arranged in sequence along the grip center line. In the axial direction of the motor 20, the length of the upper area is greater than the length of the middle area and the lower area, and the control panel 30 is disposed in the upper area. That is to say, the length of the upper area is the largest, and the length of the internal space formed by the upper area is also the longest. The control panel 30 is disposed in the upper area, and the space length of the upper area is utilized, which has little impact on the shell shape and the overall structure is compact. It should be noted that the relative relationship between the upper area, the middle area and the lower area is defined with the grip portion 18 area where the trigger 61 is located being centered, and does not mean that the three areas need to be equally divided in any size.

[0049] The control panel 40 also includes a power control area for controlling the power of the motor 20. The power control area is located on the panel surface of the control panel away from the motor (i.e., the first panel surface 43). The first air inlet structure 12 is disposed adjacent to the power control area. Figure 6 As shown, a MOS component 42 (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET is abbreviated as MOS) is set in the power control area. Since the MOS component 42 has a large power during normal operation, the power control area generates a large amount of heat. The power control area is set on the first board surface, and the first air inlet structure is arranged adjacent to the power control area, so that the power control area is directly cooled by the external airflow flowing into the first air inlet structure, thereby improving the heat dissipation effect of the power control area.

[0050] In order to reduce the air flow resistance and improve the heat dissipation effect of the power control area. Figure 6 As shown, the control board 40 includes a proximal end relatively close to the tail end of the motor 20, wherein the proximal end of the control board 40 is at the smallest distance from the tail end of the motor, and the other parts of the control board 40 extend toward the driving end of the motor and are relatively far away from the tail end of the motor 20. In this embodiment, the power control area is located at the proximal end of the control board 40, adjacent to the air inlet side of the motor, and at least part of the air gap (19) is formed between the proximal end and the housing 10. The airflow flowing through the power control area passes through the air gap 19 and finally flows out from the air outlet to the outside. Figure 6In the embodiment, the air gap 19 is formed between the outer edge of the proximal end of the control board 40 and the housing 10. Of course, the air gap is not limited to being located at the proximal end of the control board 40, but can also be formed between the circumferential outer edge of the control board 40 and the housing 10, or between part of the circumferential outer edge and the housing 10, which is not limited here. It should be noted that "proximal end" refers to the distance between the control board and the rear end of the motor, and cannot be understood as a limitation on the shape of the control board.

[0051] In a specific embodiment, please combine Figure 3 and Figure 6 As shown, the control board 40 is arranged parallel to the axis of the motor 20, and the projection of the motor 20 on the board surface (the first board surface 43 or the second board surface) of the control board 40 covers at least 50% of the power control area. The control board 40 is arranged parallel to the motor 20, which means that the axis of the motor is parallel to the board surface of the control board 40, and the direction perpendicular to the board surface of the control board is the up and down direction. The motor is located above the control board 40, and at least 50% of the power control area is located directly below the motor. This adjacent arrangement relationship makes the airflow flowing through the power control area have a short flow path, small resistance, and better heat dissipation effect.

[0052] In a specific embodiment, please combine Figure 2 and Figure 5 As shown, the first air inlet structure 12 includes a first air inlet 120 and a baffle 121 disposed inside the first air inlet 120. Specifically, the baffle 121 is formed by a portion of the shell 10 being recessed toward one side of the receiving cavity, and is located on the inner side of the first air inlet 120. At least a portion of the baffle 121 is spaced apart from the first air inlet 120, and the space forms a path connecting the receiving cavity and the outside, and the airflow enters the first air inlet 120 and enters the receiving cavity through the space. The baffle 121 at least partially blocks the first air inlet 120 to prevent foreign matter from entering the shell 10 through the first air inlet 120. In other words, the baffle 121 can completely block the first air inlet 120, or it can partially block the first air inlet 120. The setting of the baffle reduces the passing size of the first air inlet 120, which is conducive to preventing large particles of foreign matter from entering the receiving cavity.

[0053] It should be noted that the above-mentioned "partially blocked" is understood to mean that when looking at the first air inlet from the outside, the baffle and part of the interior of the receiving cavity can be seen through the first air inlet. Fully blocked is understood to mean that when looking at the first air inlet from any external angle, the sight is completely blocked by the baffle and the interior of the receiving cavity cannot be seen.

[0054] Specifically, the baffle 121 includes a closed edge and an open edge, the closed edge is closed and connected to the housing 10 to guide the airflow direction, and the open edge is spaced from the housing 10 to form a space connecting the receiving cavity and the outside, and the space serves as an airflow outlet 125 for airflow. The open edge is located on the side of the baffle 121 close to the control board 40, and the airflow outlet 125 faces the components. The airflow flowing in from the first air inlet 120 is guided by the baffle 121 to the airflow outlet 125, blown to the components on the control board, and dissipates heat for the control board.

[0055] In order to improve the heat dissipation effect, in one embodiment, the baffle 121 has an airflow guiding surface facing the first air inlet, and the airflow guiding surface is a curved surface, and the airflow guiding surface gradually moves away from the first air inlet along the airflow entering direction. The airflow guiding surface with a curved surface structure can smoothly guide the airflow entering from the first air inlet toward the control board side, so that it is aligned with the first board surface of the control board, thereby improving the heat dissipation effect on the control board.

[0056] In one embodiment, see Figure 2 As shown, the first air inlet structure 12 further includes a partition 123 for separating the first air inlet 120, and the partition 123 divides the first air inlet 120 into at least two sub-air inlets. The provision of the partition reduces the opening area of ​​a single air inlet, which is beneficial to reducing the size of particles passing through the first air inlet, and preventing large particles from entering the receiving cavity and polluting the interior of the housing.

[0057] In a specific embodiment, the first air inlet structure 12 is symmetrically arranged on both sides of the housing 10. Specifically, the first air inlet structure 12 is respectively arranged on the first half shell 15 and the second half shell 16, and the first air inlet structure 12 is symmetrical about the mating surface of the first half shell 15 and the second half shell 16. The first air inlet structure is arranged on both sides of the housing to facilitate airflow to enter the receiving cavity from both sides, thereby increasing the airflow flow for heat dissipation of the control board and ensuring the heat dissipation effect.

[0058] To sum up, the electric tool provided by the utility model is provided with a first air inlet structure on the shell to guide the external airflow into the receiving cavity, and flows through the control board to dissipate the heat of the control board. The heat dissipation of the control board adopts an independent heat dissipation duct instead of using the airflow after cooling the motor to dissipate heat, which can improve the heat dissipation effect of the control board.

[0059] Obviously, the above described embodiments are only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the utility model.

Claims

1. An electric tool, characterized in that: include: case; A motor, disposed in the housing, comprising a driving end for outputting power and a tail end opposite to the driving end; An impeller, fixedly disposed on the driving end; A control board is arranged on the radial outer side of the stator core of the motor, the control board comprises a substrate and components arranged on the substrate, at least part of the components are arranged on the surface of the substrate away from the stator core, and a connected air gap is provided between the spaces on both sides of the surface of the substrate; An air guide structure, comprising an air guide ring arranged around the impeller and an air outlet opened on the air guide ring, wherein the air guide ring is closed and arranged between the impeller and the control board to block the airflow blown out from the impeller from flowing to the control board; The first air inlet structure is arranged on the shell and is located on a side of the control board away from the motor. The airflow entering from the first air inlet structure cools the control board, passes through the wind gap, and flows out from the air outlet.

2. The electric tool according to claim 1, characterized in that: The control board also includes a power control area for controlling the power of the motor. The power control area is located on the board surface of the control board away from the motor, and the first air inlet structure is arranged adjacent to the power control area.

3. The electric tool according to claim 2, characterized in that: The control board includes a proximal end relatively close to the tail end, the power control area is located at the proximal end of the control board, at least part of the wind gap is formed between the proximal end and the shell, and the airflow flowing through the power control area passes through the wind gap and finally flows out to the outside from the air outlet.

4. The electric tool according to claim 2, characterized in that: The control board is arranged parallel to the axis of the motor, and the projection of the motor on the board surface of the control board covers at least 50% of the power control area.

5. The electric tool according to claim 1, wherein: The first air inlet structure includes a first air inlet and a baffle arranged inside the first air inlet, at least a portion of the baffle is spaced apart from the first air inlet, and the baffle at least partially blocks the first air inlet to prevent foreign matter from entering the shell through the first air inlet.

6. The electric tool according to claim 5, characterized in that: The first air inlet structure also includes a partition that separates the first air inlet, and the partition divides the first air inlet into at least two sub-air inlets.

7. The electric tool according to claim 5, characterized in that: The baffle includes a closed edge and an open edge, the closed edge is closed and connected to the shell to guide the direction of the airflow, the open edge is spaced apart from the shell to form an airflow outlet, the open edge is located on a side of the baffle close to the control board, the airflow outlet faces the component, and the airflow flowing in from the first air inlet is guided by the baffle to the airflow outlet.

8. The electric tool according to claim 5, characterized in that: The baffle has an airflow guiding surface facing the first air inlet, the airflow guiding surface is a curved surface, and the airflow guiding surface gradually moves away from the first air inlet along the airflow entry direction.

9. The electric tool according to claim 1, wherein: The first air inlet structure is symmetrically arranged on both sides of the shell.

10. The electric tool according to claim 1, wherein: A part of the air guide ring is formed by the outer wall of the shell, and another part is formed by the convex ribs of the inner wall of the shell. The air outlet is arranged on the outer wall of the shell.

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