A power tool

Abstract

The application provides an electric tool, comprising a shell, a control board and a fan assembly; wherein the shell comprises a containing cavity, an air inlet and an air outlet in fluid communication with the containing cavity, the control board and the fan assembly are accommodated in the containing cavity, the control board is arranged close to the air inlet, the fan assembly is arranged close to the air outlet, the fan assembly rotates around a rotation axis to introduce air flow from the air inlet into the containing cavity, and the air flow is discharged from the air outlet after flowing through the control board; the rotation axis is parallel to the extension direction of the control board, and the projection of the control board and the fan assembly in the direction of the rotation axis overlaps. The electric tool provided by the application can realize efficient heat dissipation of the control board, and improves the safety and reliability of the electric tool.

Description

Technical Field

[0001] This application relates to the field of electric equipment technology, and more particularly to an electric tool. Background Technology

[0002] In current power tool designs, efficient heat dissipation is crucial for ensuring stable operation. However, when power tools operate under high loads for extended periods, the heat generated by the electronic components on the control board accumulates, potentially triggering overheat protection. This can affect the normal operation of the power tool, reduce work efficiency, and even damage components on the control board, increasing operational risks and compromising the tool's safety and reliability. Utility Model Content

[0003] In view of the above, this application provides a power tool to solve the problem of heat accumulation caused by electronic components on the control board, which leads to overheating protection of the power tool.

[0004] The first aspect of this application provides an electric tool, including a housing, a control board, and a fan assembly; wherein the housing includes a receiving cavity, an air inlet and an air outlet in fluid communication with the receiving cavity, the control board and the fan assembly are housed within the receiving cavity, the control board is disposed near the air inlet, and the fan assembly is disposed near the air outlet, the fan assembly rotates about a rotation axis to introduce airflow from the air inlet into the receiving cavity, and after flowing through the control board, it is discharged from the air outlet; the rotation axis is parallel to the extension direction of the control board, and the projections of the control board and the fan assembly in the direction along the rotation axis overlap.

[0005] As an alternative implementation, the fan assembly includes fan blades and an auxiliary motor that drives the fan blades to rotate, with the control board perpendicular to the plane of rotation of the fan blades.

[0006] As an optional implementation, the receiving cavity includes a first air passage, a second air passage, and an opening connecting the first air passage and the second air passage; the first air passage connects to the air inlet, and the second air passage connects to the air outlet; the control board is disposed in the first air passage, and the fan assembly is disposed in the second air passage; the fan assembly introduces airflow from the air inlet, flows through the first air passage, the opening, and the second air passage in sequence, and then discharges it from the air outlet.

[0007] As an optional implementation, the ventilation area of ​​the opening is less than or equal to the air inlet area, and the ventilation area of ​​the opening is greater than or equal to the air outlet area.

[0008] As an alternative implementation, the fan assembly includes a centrifugal fan with an inlet surface and an outlet surface; the inlet surface is aligned with an opening, the outlet surface is aligned with an air outlet, and the inlet area of ​​the inlet surface is larger than the outlet area of ​​the outlet surface.

[0009] As an alternative implementation, the fan assembly includes an axial fan with an inlet surface and an outlet surface; the inlet surface is aligned with the opening, and the outlet surface is aligned with the air outlet.

[0010] As an optional implementation, the power tool also includes a heat sink housing; the heat sink housing is fitted onto the control panel and has heat dissipation fins.

[0011] As an optional implementation, the extension direction of the heat dissipation fins is set parallel to the airflow direction.

[0012] As an alternative implementation, the power tool includes a motor, a working head driven by the motor, and a connecting rod connecting the working head and the housing, wherein the extension direction of the control panel is substantially perpendicular to the extension direction of the connecting rod.

[0013] As an alternative implementation, the power tool also includes a battery pack connected to the housing, with a control panel located between the battery pack and the connecting rod, and heat dissipation fins facing the extension rod.

[0014] By employing the embodiments of this application, a receiving cavity is provided within the housing, the control board is positioned near the air inlet, and the fan assembly is positioned near the air outlet, with the extension direction of the control board parallel to the rotation axis of the fan assembly. This controls the fan assembly to rotate around the rotation axis, drawing airflow from the air inlet into the receiving cavity, which then flows through the control board and exits from the air outlet. This achieves efficient heat dissipation of the control board, preventing overheating of the power tool and improving its safety and reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an electric tool provided in one embodiment of this application.

[0016] Figure 2 This is a schematic diagram of the specific structure of the power tool provided in one embodiment of this application.

[0017] Figure 3 This is a schematic diagram of the structure of a centrifugal fan provided in one embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the structure of the heat dissipation housing provided in one embodiment of this application.

[0019] Figure 5 This is another structural schematic diagram of the power tool provided in one embodiment of this application.

[0020] Figure 6 This is another specific structural schematic diagram of the power tool provided in one embodiment of this application.

[0021] Figure 7This is a schematic diagram of a power tool module provided in one embodiment of this application.

[0022] Explanation of main component symbols: power tool 100, housing 10, control board 20, fan assembly 30, receiving cavity 40, air inlet 50, air outlet 51, first air passage 41, second air passage 42, opening 43, heat dissipation housing 60, heat dissipation fins 61, working head 70, connecting rod 71, socket 80, controller 90, switch 91, battery pack 92, rotation axis S1. Detailed Implementation

[0023] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] In the embodiments of this application, terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or order. For example, "first application" and "second application" are used to distinguish different applications, not to describe a specific order of applications. Features specified as "first" or "second" may explicitly or implicitly include one or more of those features.

[0026] In current power tool designs, efficient heat dissipation is crucial for ensuring stable operation. However, when power tools operate under high loads for extended periods, the heat generated by the electronic components on the control board accumulates, potentially triggering overheat protection. This can affect the normal operation of the power tool, reduce work efficiency, and even damage components on the control board, increasing operational risks and compromising the tool's safety and reliability.

[0027] Therefore, this application provides a power tool that can solve the problem of heat accumulation caused by electronic components on the control board, which leads to overheating protection of the power tool.

[0028] Please refer to Figure 1 and Figure 2This diagram illustrates the structure of a power tool 100 according to an embodiment of this application. In this embodiment, the power tool 100 includes a housing 10, a control board 20, and a fan assembly 30. The housing 10 includes a receiving cavity 40, an air inlet 50 and an air outlet 51 in fluid communication with the receiving cavity 40. The control board 20 and the fan assembly 30 are housed within the receiving cavity 40. The control board 20 is disposed near the air inlet 50, and the fan assembly 30 is disposed near the air outlet 51. The fan assembly 30 rotates around a rotation axis (e.g., ...). Figure 3 When the rotation axis S1 shown rotates, airflow is introduced into the receiving cavity 40 from the air inlet 50, flows through the control plate 20, and is discharged from the air outlet 51. The rotation axis S1 is parallel to the extending direction of the control plate 20, and the projections of the control plate 20 and the fan assembly 30 overlap along the rotation axis S1. The control plate 20 is positioned closer to the air inlet 50, and the fan assembly 30 is positioned closer to the air outlet 51, meaning that along the rotation axis S1, the control plate 20 is closer to the air inlet 50 than the fan assembly 30, and the fan assembly 30 is closer to the air outlet 51 than the control plate 20. The extending direction of the control plate 20 refers to the direction parallel to the surface of the control plate 20 used for mounting components (e.g., the heat sink 60).

[0029] The accommodating cavity 40 refers to the main structure forming the airflow channel, which can be implemented using an injection-molded cavity structure. Its internal space must meet the requirements for electronic component installation and airflow passage. The air inlet 50 and air outlet 51 refer to the ventilation channels located on both sides of the housing 10, which can be implemented using a honeycomb dustproof structure to ensure unidirectional airflow. Projection overlap refers to the spatial correspondence between the control board 20 and the fan assembly 30 along the extension direction of the rotation axis S1. The rotation axis S1 is the straight line around which the fan blades of the fan assembly 30 make circular motion during rotation; it is the geometric center and mechanical reference of the fan assembly 30's rotation.

[0030] Specifically, when the fan assembly 30 operates, it creates a negative pressure zone at the air outlet 51, drawing continuous airflow so that external air can enter the receiving cavity 40 through the air inlet 50, contact the surface of the control board 20, and carry away the heat from the surface of the control board 20. Since the rotation axis S1 is parallel to the plane of the control board 20, the airflow along the board surface reduces energy loss caused by turbulence. The overlapping design of the control board 20 and the fan assembly 30 shortens the heat dissipation path, allowing heated air to be quickly exhausted, forming a unidirectional circulating airflow from the air inlet 50 to the exhaust port. With the motor and control board 20 physically isolated, active heat dissipation of the control board 20 is achieved, preventing overheating protection of the power tool and improving its safety and reliability.

[0031] In the embodiments of this application, the airflow is introduced into the receiving cavity 40 from the air inlet 50 by the fan assembly 30, flows through the control board 20 and is discharged from the air outlet 51, thereby achieving efficient heat dissipation of the control board 20 and improving the safety and reliability of the power tool 100.

[0032] In an alternative implementation, the fan assembly 30 includes fan blades and an auxiliary motor for driving the fan blades to rotate, with the control board 20 perpendicular to the plane of rotation of the fan blades.

[0033] The fan blade rotation plane refers to the trajectory plane formed by the fan blade during rotation. Specifically, it can be formed by rotating a metal or engineering plastic blade around its axis. The airflow direction generated during the fan blade rotation is perpendicular to the rotation plane. The control board 20 being perpendicular to the rotation plane means that the main plane of the control board 20 is orthogonal to the fan blade rotation plane. This can be achieved by aligning the circuit board of the control board 20 with the fan blade axis.

[0034] Specifically, the auxiliary motor in the fan assembly 30 is set up independently of the main drive system of the power tool 100, and is connected to the power supply via wires to drive the fan blades to rotate. When the fan blades rotate, the airflow passes parallel to the surface of the control board 20 along the direction of the rotation axis to dissipate heat from the control board 20.

[0035] In the embodiments of this application, the control board 20 is cooled by independently setting an auxiliary motor to drive the fan blades to rotate. This allows for continuous cooling without relying on the main equipment's operating status. Furthermore, by making the control board 20 perpendicular to the fan blades' rotation plane, the cooling efficiency of the control board 20 is further improved.

[0036] In one optional implementation, the receiving cavity 40 includes a first air passage 41, a second air passage 42, and an opening 43 connecting the first air passage 41 and the second air passage 42. The first air passage 41 is connected to an air inlet 50, and the second air passage 42 is connected to an air outlet 51. A control board 20 is disposed in the first air passage 41, and a fan assembly 30 is disposed in the second air passage 42. The fan assembly 30 introduces airflow from the air inlet 50, which flows sequentially through the first air passage 41, the opening 43, and the second air passage 42 before being discharged from the air outlet 51.

[0037] The first air duct 41 is an independent airflow channel directly connected to the air inlet 50. Specifically, it can be formed by partitioning within the accommodating cavity 40, guiding external airflow preferentially across the surface of the control plate 20. The second air duct 42 is an independent airflow channel connected to the air outlet 51. Specifically, it can be a cavity structure connected to the first air duct 41 through an opening 43, used to accommodate the fan assembly 30 and form an airflow path. The opening 43 is a through-hole structure connecting the first air duct 41 and the second air duct 42. Specifically, it can be implemented using a channel with a rectangular or circular cross-section, and its ventilation area is configured to be less than or equal to the air inlet area of ​​the air inlet 50 and greater than or equal to the air outlet area of ​​the air outlet 51.

[0038] Specifically, external airflow enters the first air duct 41 through the air inlet 50, flows along the first air duct 41 and completely covers the surface of the control board 20, then enters the second air duct 42 through the opening 43, accelerates under the drive of the fan assembly 30, and finally exits from the air outlet 51. The separate chamber design of the first air duct 41 and the second air duct 42 ensures that the airflow flows through the area where the control board 20 is located along a predetermined path, and the ventilation area limitation of the opening 43 effectively prevents the airflow from flowing directly to the air outlet 51 without passing through the control board 20. The control board 20 and the fan assembly 30 are respectively set in independent air ducts, forming a series heat dissipation path, ensuring that the airflow can only enter the second air duct 42 and be discharged after completing heat exchange through the control board 20.

[0039] Compared with the prior art, the power tool 100 in the embodiments of this application suffers from airflow that tends to diffuse disorderly within the receiving cavity 40 in traditional split structures, resulting in airflow dead zones in some areas. This solution, through a split-cavity structure, allows airflow to flow unidirectionally through the first air passage 41, opening 43, and second air passage 42 sequentially, avoiding airflow detours or short circuits. This ensures that when the motor and control board 20 are separated, external airflow always preferentially flows over the surface of the control board 20, preventing insufficient local heat dissipation due to chaotic airflow paths and further improving the heat dissipation efficiency of the control board 20.

[0040] In one alternative implementation, the ventilation area of ​​opening 43 is less than or equal to the air inlet area of ​​air inlet 50, and the ventilation area of ​​opening 43 is greater than or equal to the air outlet area of ​​air outlet 51.

[0041] The ventilation area of ​​opening 43 refers to the minimum cross-sectional area of ​​the connecting channel between the first air duct 41 and the second air duct 42. This can be achieved by setting a rectangular or circular through-hole shape to control the flow resistance at the air duct transition point. The air inlet area of ​​inlet 50 refers to the inlet cross-sectional area of ​​external air entering the first air duct 41, for example, formed by a porous grille or a single-hole structure; its size is determined by the air intake efficiency requirements. The air outlet area of ​​outlet 51 refers to the outlet cross-sectional area of ​​the airflow exiting the second air duct 42, and its shape can be adjusted to match the exhaust capacity of the fan assembly 30.

[0042] Specifically, the airflow enters the first air duct 41 through the air inlet 50, flows through the control board 20, and then enters the second air duct 42 through the opening 43, where it is driven out by the fan assembly 30. The design of the opening 43 having a ventilation area no larger than that of the air inlet 50 ensures that the airflow velocity within the first air duct 41 remains stable before entering the opening 43, preventing airflow stagnation in the control board 20 area due to the small cross-sectional area of ​​the opening 43. The design of the opening 43 having an area no smaller than that of the outlet 51 prevents backflow during the accelerated exhaust process of the airflow within the second air duct 42 due to a sudden decrease in the cross-sectional area of ​​the outlet 51, thus maintaining the continuity of airflow in the heat dissipation path. For example, when the air inlet 50 is a circular hole with a diameter of 10 mm, the opening 43 can be designed as a square hole with a side length of 8 mm, while the outlet 51 can be configured as a circular hole with a diameter of 6 mm.

[0043] Compared with the prior art, the power tool 100 in the embodiments of this application does not have clear constraints on the cross-sectional area variation of the airflow channel path in conventional designs. For example, the opening 43 of the second air passage 42 may be larger than the air inlet 50, causing the airflow velocity to decrease in the control panel 20 area, or the cross-sectional area of ​​the air outlet 51 may be too small, causing the airflow to accumulate at the end. This solution limits the ratio between the area of ​​the opening 43 and the air inlet and outlet 51, so that the airflow forms a dynamic characteristic of first stabilizing and then accelerating in the heat dissipation path, avoiding the impact of local pressure fluctuations on heat dissipation efficiency.

[0044] In one alternative implementation, please refer to Figure 3 The fan assembly 30 includes a centrifugal fan with an air inlet surface and an air outlet surface. The air inlet surface is aligned with the opening 43. The air inlet surface refers to the area where the centrifugal fan draws in air, and the air outlet surface refers to the outlet area where the air drawn in by the centrifugal fan is discharged after being accelerated by the centrifugal fan. The air outlet surface of the fan assembly 30 is aligned with the air outlet 51, and the air inlet area of ​​the air inlet surface is larger than the air outlet area of ​​the air outlet surface.

[0045] Centrifugal fans are air delivery devices that draw air in axially and discharge it radially through rotating blades. Specifically, they can be implemented using a structure with curved blades, and their axial airflow characteristics create directional airflow. Alignment of the inlet surface with opening 43 means that the axial inlet 50 of the centrifugal fan completely covers the projected area of ​​the air duct opening 43. This can be achieved by adjusting the installation position to make their axes coincide, preventing airflow deviation and resulting in heat dissipation blind spots. Alignment of the outlet surface with outlet 51 means that the end of the radial exhaust channel of the centrifugal fan forms a straight line connection with the outlet 51 of the housing 10. An inlet area greater than the outlet area means that the cross-sectional area of ​​the axial inlet 50 of the centrifugal fan is greater than the cross-sectional area of ​​its radial exhaust port. This can be achieved by using a tapered guide channel connecting the outlet surface and outlet 51, creating a pressure gradient through the area difference to accelerate airflow discharge.

[0046] Specifically, during centrifugal fan operation, airflow enters the axial inlet 50 of the centrifugal fan from the first air duct 41 through the opening 43. Under the action of blade rotation, the airflow direction changes, and it is accelerated and ejected radially. Since the inlet surface completely covers the opening 43, the airflow can enter the second air duct 42 without obstruction. The straight alignment of the outlet surface and the outlet 51 ensures that the airflow flows directionally along a preset path, avoiding turbulence within the second air duct 42. The design, where the inlet area is larger than the outlet area, results in a lower airflow velocity upon entering the centrifugal fan. After centrifugal acceleration, the airflow is discharged at a higher speed from the narrow outlet surface, creating a forced convection effect. This velocity change, combined with the pressurization characteristics of the centrifugal fan, overcomes the flow resistance within the heat dissipation channel, preventing airflow stagnation in the control board 20 area.

[0047] In the power tool 100 of the embodiments of this application, the radial air outlet characteristics of the centrifugal fan can adapt to the straight path of the second air duct 42, reduce airflow energy loss, and accelerate the airflow at the narrow air outlet surface through the pressurization effect generated by the area difference, thereby enhancing the airflow penetration ability in the heat dissipation channel and avoiding backflow caused by air outlet resistance. A stable heat dissipation path is formed between the control board 20 and the air outlet 51, effectively improving the heat dissipation efficiency of the control board 20.

[0048] In an alternative implementation, the fan assembly 30 includes an axial fan with an inlet surface and an outlet surface. The inlet surface is aligned with an opening 43 within the receiving cavity 40 that connects the first air passage 41 and the second air passage 42, and the outlet surface is aligned with an outlet 51. It is understood that the inlet surface refers to the area where the axial fan draws in air, and the outlet surface refers to the outlet area where the air drawn in by the axial fan is accelerated and discharged.

[0049] The axial fan refers to the fan assembly 30 in which airflow flows along its rotation axis S1. Specifically, it can be implemented using a hub and radial blade combination structure, with axial airflow generated by blade rotation. The inlet surface refers to the side face where air is drawn in along the rotation axis S1, and can be designed as a planar annular structure so that the opening 43 area completely covers this end face. The outlet surface refers to the other end face where the airflow is accelerated and discharged axially. The outlet direction can be aligned with the central axis of the outlet 51 by adjusting the blade tilt angle.

[0050] Specifically, when the axial fan is powered on, the airflow entering through the inlet 50 passes through the control board 20 and then enters the air intake surface of the axial fan through the opening 43. Because the air intake surface and the opening 43 are perfectly aligned, the airflow is uniformly drawn in axially without generating inlet vortices. After accelerating the airflow axially, the axial fan directly discharges it from the outlet surface to the outlet 51. This axial alignment design creates a continuous straight channel for the airflow, avoiding localized airflow reversal or diffusion losses caused by misalignment between the fan assembly 30 and the opening 43 in traditional structures.

[0051] Compared with the prior art, the fan assembly 30 of the power tool 100 in the embodiments of this application often adopts a non-axial layout, such as a centrifugal fan installed at an angle or an axial fan deviating from the central axis of the air passage, which causes turbulence in the airflow at the opening 43 and reduces the air pressure utilization rate. This solution eliminates the airflow path detour by axially aligning the layout, realizes the straight conduction of the airflow path, solves the problem of heat dissipation efficiency reduction caused by the mismatch between the position of the axial fan and the air passage opening 43, and enables the heat generated by the control board 20 to be quickly carried away from the housing 10 by the high-speed airflow, avoiding the control board 20 from triggering overheat protection due to insufficient heat dissipation.

[0052] In one alternative implementation, please refer to Figure 4 The power tool 100 also includes a heat dissipation housing 60. The heat dissipation housing 60 is sleeved on the control board 20, and heat dissipation fins 61 are provided on the heat dissipation housing 60.

[0053] The phrase "heat sink 60 is mounted on control board 20" means that control board 20 is wrapped inside heat sink 60 to form physical contact. Specifically, it can be made of metal or thermally conductive plastic material, and the heat generated by control board 20 is conducted to the surface of heat sink 60 through direct contact.

[0054] The heat dissipation fins 61 refer to the raised structures formed on the surface of the heat dissipation shell 60. Specifically, they can be implemented using parallel arranged strip-shaped protrusions, which increase the heat dissipation surface area to accelerate the diffusion of heat to the surrounding air. Specifically, the extension direction of the heat dissipation fins 61 is parallel to the airflow direction. This means that the extension direction of the heat dissipation fins 61 is consistent with the tangential direction of the airflow path on the outer surface of the heat dissipation shell 60. This is achieved by aligning the arrangement direction of the heat dissipation fins 61 with the axial direction of the airflow duct inside the heat dissipation shell 60, so that the direction of the heat dissipation fins 61 is parallel to the airflow direction.

[0055] Specifically, the heat sink 60 tightly wraps around the control board 20, rapidly dissipating heat generated by the electronic components to the surface of the heat sink 60 through the thermal conductivity of the material. By adjusting the extension direction of the heat dissipation ribs 61 to be parallel to the airflow direction, the rib structure of the heat dissipation ribs 61 does not laterally obstruct the airflow. When the airflow passes over the surface of the heat dissipation ribs 61, the longitudinal channels formed between the ribs allow the airflow to flow smoothly along its length. Due to the parallel relationship between the heat dissipation ribs 61 and the airflow direction, the airflow will not generate eddies or local pressure losses due to the vertical or inclined arrangement of the ribs. Thus, while maintaining the original airflow velocity, the rib structure of the heat dissipation ribs 61 increases the contact area between the surface of the heat sink 60 and the airflow, promoting heat conduction and diffusion.

[0056] The embodiments of this application achieve efficient heat conduction between the control board 20 and the heat sink 60 by using the synergistic effect of the heat sink 60 and the heat sink 61, and enhance the heat exchange between the airflow and the surface of the heat sink 60 by using the heat sink 61, so that the heat generated by the control board 20 is continuously discharged to the external environment, further preventing the electronic components from overheating or being damaged due to temperature accumulation, and improving the operational stability and safety of the power tool 100 in the split structure.

[0057] In one alternative implementation, please refer to Figure 5The power tool 100 includes a motor (not shown in the figure), a working head 70 driven by the motor, and a connecting rod 71 connecting the working head 70 and the housing 10. The extension direction of the control plate 20 is substantially perpendicular to the extension direction of the connecting rod 71. It can be understood that "substantially perpendicular" means that the angle between the extension directions of the control plate 20 and the connecting rod 71 is 90°, or that the deviation angle between the extension directions of the control plate 20 and the connecting rod 71 is within a preset tolerance range. That is, when the angle between the extension directions of the control plate 20 and the connecting rod 71 is 90°±α, it can be considered that the extension directions of the control plate 20 and the connecting rod 71 are substantially perpendicular. For example, in some embodiments, when the deviation angle α is 10°, the angle β between the extension directions of the control plate 20 and the connecting rod 71 is 90°±10°, which can be considered substantially perpendicular. That is, when the angle β between the extension direction of the control plate 20 and the extension direction of the connecting rod 71 satisfies 80°≤β≤100°, the two can be considered to be basically perpendicular.

[0058] The motor can be a DC motor or an AC motor to provide driving power for the working head 70. The working head 70 is the actuating component that directly acts on the workpiece, and can be a drill bit, grinding head, or cutting disc, driven by the motor to rotate or reciprocate. The connecting rod 71 is a rigid structural component connecting the working head 70 and the housing 10, and can be made of metal tubing or composite material rods, used to transmit mechanical loads and maintain the relative positional relationship between the working head 70 and the housing 10.

[0059] Specifically, the motor is configured to directly drive the working head 70 to rotate, avoiding the multi-stage energy conversion via gearbox or belt drive found in traditional designs. One end of the connecting rod 71 is fixed inside the housing 10, and the other end is rigidly connected to the working head 70 via a flange or snap-fit ​​structure, allowing the torque output by the motor to be directly transmitted to the working head 70. The axial length of the connecting rod 71 can be adjusted according to the tool type; for example, a short rod structure is used in an angle grinder to reduce vibration amplitude, while a long rod structure is used in an electric drill to improve operational flexibility.

[0060] In some specific embodiments, a shock-absorbing pad can be provided between the connecting rod 71 and the housing 10 to absorb high-frequency vibration; the mounting end of the working head 70 can be designed as a quick-release interface to facilitate the replacement of working heads 70 with different functions; the output shaft of the motor and the working head 70 can be connected by a spline to ensure the reliability of torque transmission.

[0061] The embodiments of this application eliminate frictional losses of intermediate transmission components by using a direct drive connecting rod 71 between the motor and the working head 70. At the same time, the compact layout of the connecting rod 71 improves the utilization rate of the internal space of the housing 10, enhances the overall structural rigidity, effectively suppresses the radial sway of the working head 70 during high-speed operation, and improves the operational stability of the power tool 100.

[0062] In some embodiments, the power tool 100 includes a battery pack (not shown in the figure) that provides power to the motor. A control board 20 is located between the battery pack 92 and the connecting rod 71, with the heat dissipation fins 61 facing the connecting rod 71. One side of the control board 20's connecting cable faces the battery pack 92, allowing the battery pack 92 to be directly connected to the control board 20 via a cable. This shortens the cable length between the battery pack 92 and the control board 20, reducing the wiring complexity between them. Please refer to [link to relevant documentation]. Figure 6 The housing 10 is provided with a battery socket 80, and the battery pack can be inserted into the socket 80 in a preset direction perpendicular to the connecting rod 71.

[0063] The battery pack refers to a detachable power supply unit, which can be implemented by matching a lithium-ion battery pack with the slot in the housing 10. It provides power to the drive system and cooling system synchronously through a unified power supply interface, ensuring voltage stability for different functional modules. The mounting direction of the connector 80 refers to the spatial orthogonal relationship between the battery pack and the connecting rod 71. This can be achieved by creating a horizontal slot on the side of the housing 10. This orthogonal layout reduces the battery pack's footprint on the tool's longitudinal space and avoids interference between the insertion direction and the airflow path.

[0064] Specifically, the battery pack is perpendicularly inserted into the housing 10 via the connector 80, allowing the battery pack to extend laterally along the tool after installation, forming a spatial orthogonal relationship with the longitudinal extension of the connecting rod 71. This installation method allows the power lines to be directly connected to the internal circuit from the side of the housing 10, shortening the wire length and reducing the impact of line impedance on power supply stability. Simultaneously, the orthogonal layout of the battery pack and connecting rod 71 avoids obstructing the heat dissipation channel as is common in traditional axial installation methods, ensuring that the airflow path from the inlet 50 to the outlet 51 remains straight, preventing increased turbulence or wind resistance due to the battery pack's installation position.

[0065] For details, please refer to Figure 7The power tool 100 may further include a controller 90 and a switch 91. The controller 90 may be mounted on the control board 20 and is connected to the fan assembly 30, the switch 91, and the battery pack 92. When the switch 91 is in the ON position, the battery pack 92 provides operating voltage to the fan assembly 30 through the controller 90 to drive the fan assembly 30 for heat dissipation; when the switch 91 is in the OFF position, the controller 90 controls the battery pack 92 to stop providing operating voltage to the fan assembly 30, thereby stopping the fan assembly 30 from operating.

[0066] The embodiments of this application use a vertical plug-in structure to spatially separate the installation direction of the battery pack 92 from the axis of the connecting rod 71, which maintains the overall compactness of the tool and the linear flow characteristics of the heat dissipation channel, optimizes the internal space utilization of the power tool 100, prevents the battery pack 92 from blocking the heat dissipation airflow path, and improves the heat dissipation efficiency of the control board 20.

[0067] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application should fall within the scope of protection claimed by this application.

Claims

1. An electric tool, comprising a housing, a control panel, and a fan assembly; in, The housing includes a receiving cavity, an air inlet and an air outlet in fluid communication with the receiving cavity, a control board and a fan assembly housed within the receiving cavity, the control board being disposed near the air inlet and the fan assembly being disposed near the air outlet, the fan assembly rotating about a rotation axis to introduce airflow from the air inlet into the receiving cavity, and after flowing through the control board, discharge from the air outlet; characterized in that the rotation axis is parallel to the extending direction of the control board, and the projections of the control board and the fan assembly along the rotation axis overlap.

2. The power tool according to claim 1, characterized in that, The fan assembly includes fan blades and an auxiliary motor that drives the fan blades to rotate, and the control board is perpendicular to the plane of rotation of the fan blades.

3. The power tool according to claim 1, characterized in that, The receiving cavity includes a first air passage, a second air passage, and an opening connecting the first air passage and the second air passage; The first air passage is connected to the air inlet, and the second air passage is connected to the air outlet; The control board is disposed in the first air duct, and the fan assembly is disposed in the second air duct; The fan assembly introduces airflow from the air inlet, which flows sequentially through the first air passage, the opening, and the second air passage before being discharged from the air outlet.

4. The power tool according to claim 3, characterized in that, The ventilation area of ​​the opening is less than or equal to the air inlet area, and the ventilation area of ​​the opening is greater than or equal to the air outlet area.

5. The power tool according to claim 3, characterized in that, The fan assembly includes a centrifugal fan having an air inlet surface and an air outlet surface; The air inlet surface is aligned with the opening, the air outlet surface is aligned with the air outlet, and the air inlet area of ​​the air inlet surface is larger than the air outlet area of ​​the air outlet surface.

6. The power tool according to claim 3, characterized in that, The fan assembly includes an axial fan with an air inlet surface and an air outlet surface; The air inlet surface is aligned with the opening, and the air outlet surface is aligned with the air outlet.

7. The power tool according to claim 1, characterized in that, The power tool includes a heat dissipation housing; The heat dissipation housing is fitted onto the control board, and heat dissipation fins are provided on the heat dissipation housing.

8. The power tool according to claim 7, characterized in that, The heat dissipation fins extend in a direction parallel to the airflow direction.

9. The power tool according to claim 7, characterized in that, The power tool includes a motor, a working head driven by the motor, and a connecting rod connecting the working head and the housing, wherein the extension direction of the control plate is perpendicular to the extension direction of the connecting rod.

10. The power tool according to claim 9, characterized in that, The power tool also includes a battery pack connected to the housing, the control board is located between the battery pack and the connecting rod, and the heat dissipation fins are oriented towards the extension rod.

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