Hand-held power tool comprising an air cooling system
By designing a fan housing and fan unit in a handheld power tool to generate parallel airflow, and using three separate air channels to cool each device, the problems of insufficient cooling, air recirculation, and blockage are solved, achieving effective cooling and extending operating time.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2026-06-12
Smart Images
Figure CN122206534A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a handheld power tool including a motor configured to provide power to the tool. Background Technology
[0002] Today, a wide variety of handheld power tools are available on the market. Examples include chainsaws, circular saws, and various types of trimmers, including hedge trimmers and combination trimmers. Handheld power tools are used in industrial, construction, and home gardening applications, as well as for a variety of home and property maintenance tasks.
[0003] A common characteristic of handheld power tools is that they are tools that can be driven by a power source rather than solely by human hands. Power sources can include, for example, motors such as internal combustion engines, electric motors, pneumatic motors, etc. Traditionally, handheld power tools such as chainsaws, circular saws, trimmers, hedge trimmers, and combination trimmers are typically driven by internal combustion engines. These engines are most commonly compact two-stroke internal combustion engine models, which offer a higher power-to-weight ratio than other types of engines.
[0004] Nevertheless, the introduction of high-capacity and high-discharge batteries (such as lithium-ion batteries) has spurred a shift towards power tools with electric motors. These batteries help electric tools compete in performance with power tools that include internal combustion engines. However, some electric power tools alternatively or additionally include electrical connections for connecting the power tool to an external power source. Electric motors offer several advantages over internal combustion engines, especially when it comes to emissions levels, efficiency, noise levels, etc.
[0005] To meet consumer and professional needs, many power tools are equipped with high-performance electric motors, requiring power supply components such as wires, contacts, control units, and batteries capable of delivering high power over extended periods. These electrical components, particularly the motor and power supply unit, generate heat during operation, with even more heat generated at higher power levels. This heat must be efficiently dissipated from these components to ensure the reliability and service life of the power tool.
[0006] Similarly, internal combustion engines generate a significant amount of heat during operation, which must be efficiently transferred from the engine to ensure its reliability and service life. Furthermore, handheld power tools typically include other types of devices besides the motor that require cooling during operation to maintain the tool's functionality and service life. Examples include batteries, battery connectors, electrical connection assemblies, electrical components, control devices, power electronics, motors, user interface devices, transmission assemblies, fuel systems, ignition systems, cylinders, lubrication systems, and the like.
[0007] Handheld power tools typically include an air-cooling system, which comprises a fan assembly designed to dissipate heat from the motor and other components by circulating air through the power tool's internal space. Liquid cooling systems are generally not used in handheld power tools due to the added weight, complexity, and cost. In most designs, both the motor and the components requiring cooling are positioned to be cooled by airflow within the internal space. Typically, air flows through the power tool's internal space in a chaotic and uncontrolled manner.
[0008] Different types of handheld power tools are associated with several common problems. One problem is ensuring adequate cooling of the motor and any auxiliary components requiring cooling under various operating conditions. As mentioned above, inadequate cooling of one or more components of a handheld power tool can reduce its service life, and operational reliability is a primary concern. Furthermore, inadequate cooling of one or more components can reduce the operating efficiency and / or available power output of the power tool's components, such as the motor.
[0009] Furthermore, handheld power tools are typically used in dusty and dirty environments, and their operation can generate significant amounts of dust, grime, and debris. Therefore, a common problem with handheld power tools is clogging of various parts of their internal space during operation. Accumulated dust, grime, or debris can significantly reduce the cooling efficiency of the various components and mechanisms of a handheld power tool.
[0010] Another issue associated with handheld power tools that include air cooling systems is air recirculation within those systems. Air recirculation within the air cooling system can reduce the cooling efficiency of various components of the system because many parts inside the power tool will be exposed to already heated air.
[0011] Another issue with various types of handheld power tools is packaging. That is, from a consumer / user's perspective, it is advantageous if handheld power tools can be made compact and lightweight. Summary of the Invention
[0012] The object of this invention is to overcome or at least mitigate at least some of the aforementioned problems and disadvantages. This object is achieved through the subject matter of the appended independent claims.
[0013] According to one aspect of this disclosure, this objective is achieved by a handheld power tool including a motor configured to provide power to the tool. The power tool also includes a fan housing and a fan unit, wherein the fan housing includes an inlet and three separate outlets. The fan unit is arranged to rotate within the fan housing during operation of the power tool to generate airflow from the inlet to each of the three separate outlets. The power tool also includes three separate air passages, each connected to one of the three separate outlets, wherein each of the three separate air passages is configured to cool a corresponding device of the power tool.
[0014] Therefore, a handheld power tool is provided in which three separate air channels can cool corresponding devices without utilizing air preheated by another corresponding device. In other words, it can be ensured that devices cooled by the three separate air channels are cooled in parallel, and there is no air recirculation between the devices. Thus, in other words, the following conditions are provided: for cooling at least three different devices in parallel, and without any air recirculation between these devices. Therefore, effective cooling of each device can be ensured in various operating states of the handheld power tool.
[0015] Furthermore, a handheld power tool is provided in which the geometry and design of three separate air channels can be adapted to meet the cooling needs of different types of devices in different types and configurations of handheld power tools in a simple and cost-effective manner.
[0016] Furthermore, because the fan housing includes three separate outlets, and because the power tool includes three separate air channels, each connecting to one of the three separate outlets, conditions are provided to reduce the likelihood of blockages in the air channels of the handheld power tool. This is because the geometry and design of the air channels are easily adaptable, allowing sufficient airflow through each of the three channels to prevent material buildup. Therefore, conditions are provided to allow the power tool to operate for extended periods before cleaning or servicing is required.
[0017] Therefore, due to the characteristics of power tools, it is possible to ensure effective cooling of power tools under various operating conditions and during extended operating periods.
[0018] Therefore, a handheld power tool is provided that overcomes or at least mitigates some of the aforementioned problems and disadvantages. Thus, the aforementioned objective is achieved.
[0019] Optionally, the power tool's motor is an electric motor, and the first of the three separate air passages is configured to cool the motor. This provides the means for an environmentally friendly power tool capable of generating low noise levels during operation, while ensuring effective cooling of the electric motor over extended operating periods under various operating conditions.
[0020] Optionally, the power tool includes a battery compartment configured to house a battery for powering a motor, wherein a second of three separate air passages is configured to cool the battery compartment. This provides conditions for a user-friendly power tool while ensuring effective cooling of the battery compartment and the battery housed therein during extended operating periods under various operating conditions of the power tool.
[0021] Optionally, the power tool includes a control unit, wherein the third of the three separate air passages is configured to cool the control unit. Therefore, effective cooling of the control unit can be ensured during extended operating periods under various operating conditions of the power tool.
[0022] Optionally, the motor of the power tool is an electric motor, and the control arrangement includes power electronics configured to regulate the power supply to the motor. This provides the means for an environmentally friendly power tool capable of generating low noise levels during operation, while ensuring effective cooling of the electric motor during extended operating periods under various operating conditions.
[0023] Optionally, the fan unit is connected to the output shaft of the motor. This allows for a simple and efficient power supply to the fan unit in a cost-effective manner.
[0024] Optionally, the fan unit is a radial flow fan unit. This ensures high operating efficiency of the fan unit.
[0025] Optionally, the first of the three separate outlets forms an axial outlet. This provides conditions for alleviating packaging problems in handheld power tools, thereby enabling compact power tools that can cool at least three different components in parallel.
[0026] Alternatively, the first outlet is formed by multiple openings provided in the wall of the fan housing. This allows for a simple and compact fan housing while enabling the cooling of at least three different arrangements in parallel.
[0027] Optionally, the fan housing includes a plurality of air guiding members, each arranged adjacent to one of the plurality of orifices, wherein the plurality of air guiding members are arranged to deflect airflow through the first outlet. This improves the overall operating efficiency of the fan assembly. Furthermore, it ensures sufficient and stable airflow through the first outlet under various operating conditions of the power tool, while also enabling the parallel cooling of at least several different devices.
[0028] Optionally, the fan unit includes multiple fan blades, wherein the radial extension of the multiple fan blades is greater than the radial distance between the axis of rotation of the fan unit and the radially inner defining wall of the multiple orifices. Therefore, sufficient airflow through the first outlet of the fan housing can be further ensured under various operating conditions of the power tool, while also ensuring sufficient airflow through the remaining outlets of the fan housing.
[0029] Optionally, the fan unit includes an axial end plate, wherein the axial end plate faces the wall of the fan housing. This further ensures high operating efficiency of the fan unit while enabling the parallel cooling of at least three different devices.
[0030] Optionally, the radial extension of the axial end disc is less than the radial distance between the rotation axis of the fan unit and the radially inner defining wall of the plurality of orifices. Therefore, sufficient airflow through the first outlet of the fan housing can be further ensured under various operating conditions of the power tool.
[0031] Optionally, the power tool's motor is an electric motor, wherein the first outlet is connected to a first air passage among three separate air passages, and wherein the first air passage is configured to cool the motor. This provides the means for an environmentally friendly power tool capable of generating low noise levels during operation, while ensuring effective cooling of the electric motor over extended operating periods under various operating conditions.
[0032] Optionally, the second of these three separate outlets forms a radial outlet, a tangential outlet, or a combination thereof. This provides conditions for mitigating packaging issues in handheld power tools, thereby enabling compact power tools while simultaneously allowing for the parallel cooling of at least three different devices within the power tool.
[0033] Optionally, the power tool includes a battery compartment configured to house a battery for powering a motor, wherein a second outlet is connected to a second air passage of three separate air passages, and wherein the second air passage is configured to cool the battery compartment. This provides the conditions for an environmentally friendly power tool while ensuring effective cooling of the battery compartment and the battery housed therein during extended operating periods under various operating conditions of the electric motor.
[0034] Optionally, the third of the three separate outlets forms a radial outlet, a tangential outlet, or a combination thereof. This provides conditions for alleviating packaging problems in handheld power tools, thereby enabling compact power tools while simultaneously allowing for the parallel cooling of at least three different components of the power tool.
[0035] Optionally, the power tool includes a control unit, wherein a third outlet is connected to a third air passage among three separate air passages, and wherein the third air passage is configured to cool the control unit. This provides conditions for effective cooling of the control unit during extended operating periods under various operating conditions of the power tool.
[0036] Optionally, the power tool includes three separate air outlets, each configured to exhaust air from one of the three separate air channels to the surrounding environment. This ensures efficient exhaust of air from the three separate air channels to the surrounding environment while preventing any internal mixing of air from the three separate air channels. In this way, effective cooling of the various components of the handheld power tool can be further ensured.
[0037] Optionally, the power tool is configured to be selected from the group consisting of: chainsaws, power cutters, trimmers, hedge trimmers, combination trimmers, and leaf / debris blowers. Therefore, a power tool configured to be selected from the above group is provided, which has at least some of the aforementioned advantages.
[0038] Further features and advantages of the invention will become clear when the appended claims and the following detailed description are examined. Attached Figure Description
[0039] Various aspects of this disclosure (including its particular features and advantages) will be readily understood from the exemplary embodiments discussed in the following detailed description and accompanying drawings, in which: Figure 1 A first perspective view of a handheld power tool according to some embodiments is shown. Figure 2 It shows Figure 1 The second perspective view of the handheld power tool shown in the figure. Figure 3 It shows Figure 1 and Figure 2 The first perspective view of the fan assembly of the cooling system of a handheld power tool is shown in the figure. Figure 4 It shows Figure 3The second perspective view of the fan assembly is shown, in which the front of the fan housing is omitted for visibility reasons; Figure 5 It shows Figure 1 and Figure 2 The diagram shown illustrates the cooling system of a handheld power tool. Figure 6 It shows Figure 1 and Figure 2 A perspective view of the first side of the fan housing of the cooling system of a handheld power tool is shown, and Figure 7 It shows Figure 1 and Figure 2 A perspective view of the second side of the fan housing of the cooling system of a handheld power tool. Detailed Implementation
[0040] The invention will now be described more fully. The same reference numerals denote the same elements throughout. For the sake of brevity and / or clarity, well-known functions or constructions will not be described in detail.
[0041] Figure 1 A first perspective view of a handheld power tool 1 according to some embodiments of the present invention is shown. For the sake of simplicity and clarity, the handheld power tool 1 is simply referred to as "power tool 1" in some places herein. The feature that the power tool 1 is handheld means that the power tool 1 is configured to be supported by one or both hands of the user during its operation.
[0042] According to the illustrated embodiment, the power tool 1 includes a first handle h1 and a second handle h2. The second handle h2 is separate from the first handle h1 and arranged at a distance from the first handle h1. The power tool 1 is configured to be supported via each of the first handle h1 and the second handle h2 during operation. In other words, the power tool 1 is configured to be supported by both hands of the user during operation, i.e., supported by one hand gripping the first handle h1 and the other hand gripping the second handle h2. According to a further embodiment, the power tool 1 may include only one handle.
[0043] The power tool 1 includes a tool portion 30' for attaching a tool to the power tool 1. For simplicity, in... Figure 1 The tool of power tool 1 is not shown. According to the illustrated embodiment, power tool 1 is a chainsaw. Therefore, according to the illustrated embodiment, the tool portion 30' of power tool 1 is configured to connect a tool in the form of a guide rod and a cutting chain, wherein the cutting chain is movably arranged around the guide rod.
[0044] However, according to other embodiments, the power tool 1 mentioned herein can be another type of handheld power tool, such as a power cutter, trimmer, hedge trimmer, combination trimmer, and leaf / debris blower. Clearly, according to this embodiment, the power tool 1 may include additional tool sections 30' for connecting other types of tools (such as saw blades, trimmer heads, hedge trimmer cutting assemblies, fan assemblies, etc.) besides the cutting bar and cutting chain.
[0045] A modular mower is a multi-functional gardening tool that combines several functions into one device, making it versatile for a variety of tasks. Modular mowers typically have a base unit with a motor and interchangeable attachments that can be switched out depending on the task to be performed, such as mowing grass, cutting grass, or trimming hedges.
[0046] Figure 2 It shows Figure 1 A second perspective view of the handheld power tool 1 shown. Figure 2 As shown, the power tool 1 includes a motor 3. The motor 3 is configured to provide power to the tool portion 30' of the power tool 1. Therefore, the motor 3 is operably connected to the tool portion 30' of the power tool 1, as shown... Figure 1 As shown, it is configured to power the tool attached thereto. Since the power tool according to the illustrated embodiment is a chainsaw, the motor 3 is configured to rotate the cutting chain about a guide rod attached to the tool portion 30' of the power tool 1, as described above. Figure 1 As explained below. Unless otherwise indicated, please also refer to... Figure 1 and Figure 2 .
[0047] According to the illustrated embodiment, the motor 3 of the power tool 1 is an electric motor. Furthermore, the power tool 1 includes a battery compartment 11 configured to house a battery 13 for supplying power to the motor 3. Alternatively or additionally, the power tool 1 may include an electrical connection assembly for electrically connecting the power tool to an external power source.
[0048] Furthermore, according to some embodiments of the invention, the power tool 1 may include motors of other types besides electric motors, such as internal combustion engines. In these embodiments, the motor of the power tool 1 (as mentioned herein) may be a small two-stroke internal combustion engine or a small four-stroke internal combustion engine. In this context, the term "small" may cover an internal combustion engine having a displacement of less than 250 cubic centimeters. In embodiments where the motor of the power tool 1 is an internal combustion engine, the power tool may also include a fuel filling system comprising a fuel tank, a fuel pump, a carburetor, or multiple fuel injectors. Furthermore, according to this embodiment, the power tool 1 may include one or more additional engine-related systems, such as an ignition system, an engine lubrication system, etc.
[0049] like Figure 1 and Figure 2 As shown, the power tool 1 includes a cooling system 6. As explained in more detail below, the cooling system 6 is an air cooling system. Figure 1 In the image, three separate air outlets o1', o2', and o3' of the cooling system 6 can be seen. As explained in more detail below, each of the three separate air outlets o1', o2', and o3' is configured to discharge air from one of three separate air passages arranged inside the power tool 1 to the surrounding environment. The cooling system 6 also includes... Figure 2 The air inlet 9' is shown in the image.
[0050] Figure 3 It shows Figure 1 and Figure 2 The first perspective view shows the fan assembly 4 of the cooling system 6 of the handheld power tool 1. The fan assembly 4 includes a fan housing 5 and a fan unit 7. The fan housing 5 includes an inlet 9 and three separate outlets o1, o2, and o3. Figure 3 In the middle, one of the three separate outlets o1, o2, and o3, outlet o1, is hidden behind the fan housing 5. The location of the first outlet o1 is indicated by an arrow marked with the reference symbol "o1". The inlet 9 of the fan housing 5 is arranged in... Figure 2 The air inlet 9' of the handheld power tool 1 shown.
[0051] The fan unit 7 is arranged to rotate about the axis of rotation Ax in the fan housing 5 during operation of the power tool 1 to generate airflow from the inlet 9 into each of the three separate outlets o1, o2, o3.
[0052] Figure 4 It shows Figure 3 The second perspective view of the fan assembly 4 is shown, in which the front of the fan housing 5 is omitted for visibility reasons. The front of the fan housing 5 is configured to face the air inlet 9' of the cooling system 6 of the handheld power tool 1, as shown... Figure 2 As shown.
[0053] As in Figure 4 As best seen in the illustrated embodiment, fan unit 7 is a radial fan unit, i.e., the fan unit is configured to pump air at approximately a right angle to inlet 9. According to the illustrated embodiment, the direction of inlet 9 (or more precisely, the direction toward the intended main airflow direction towards inlet 9 of fan housing 5) substantially coincides with the axis of rotation Ax of fan unit 7. According to another embodiment, fan unit 7 can be another type of fan unit, such as an axial fan unit, or a hybrid fan design operating axially and radially relative to inlet 9 of fan assembly 4.
[0054] All three separate outlets o1, o2, and o3 of fan housing 5 are in Figure 4 As can be seen, the feature that outlets o1, o2, and o3 are separate means that each of outlets o1, o2, and o3 is separate from, and distinct from, the other outlets o1, o2, and o3 of the fan housing 5. These three separate outlets o1, o2, and o3 are referred to in some places herein as first outlet o1, second outlet o2, and third outlet o3.
[0055] Figure 5 It shows Figure 1 and Figure 2 A schematic diagram of the cooling system 6 of the handheld power tool 1 is shown. Figure 5 In the diagram, the fan assembly 4 of the cooling system 6 is shown viewed in a direction aligned with the rotation axis Ax of the fan unit 7. Similarly, in... Figure 5 In the middle, the front of fan housing 5 has been removed for visibility reasons. Below, unless otherwise indicated, refer to... Figures 1 to 5 .
[0056] like Figure 5 As shown, the cooling system 6 of the power tool 1 includes three separate air passages p1, p2, and p3. The feature that the three air passages p1, p2, and p3 are separate means that each air passage p1, p2, and p3 is separate from the other air passages p1, p2, and p3 of the cooling system 6, that is, different from them.
[0057] In addition, such as Figure 5 As shown, each air passage p1, p2, p3 is connected to one of three separate outlets o1, o2, o3. Furthermore, as further explained herein, each of the three separate air passages p1, p2, p3 is configured to cool a corresponding device a1, a2, a3 of the power tool 1. In other words, the handheld power tool 1 includes three separate devices a1, a2, a3, each configured to be cooled via separate air passages p1, p2, p3.
[0058] In this way, each of the three separate devices a1, a2, a3 can be cooled without utilizing air preheated by another of the three separate devices a1, a2, a3. In other words, it can be ensured that the three separate devices a1, a2, a3 are cooled in parallel without any air recirculation between the three separate devices a1, a2, a3 within the handheld power tool 1. Therefore, as further explained herein, effective cooling of each of the three separate devices a1, a2, a3 can be ensured in various operating states of the handheld power tool 1.
[0059] Furthermore, since the fan housing 5 includes three separate outlets o1, o2, o3, and since the handheld power tool 1 includes three separate air channels p1, p2, p3, each channel being connected to one of the three separate outlets o1, o2, o3, conditions are provided to reduce the possibility of material blockage in the air channels p1, p2, p3 of the handheld power tool 1.
[0060] In some places throughout this document, the three separate air channels p1, p2, and p3 are referred to as the first air channel p1, the second air channel p2, and the third air channel p3. Similarly, in some places throughout this document, the three separate devices a1, a2, and a3 are referred to as the first device a1, the second device a2, and the third device a3. According to the illustrated embodiment, the first device a1 includes a motor 3, the second device a2 includes a battery compartment 11, and the third device a3 includes a control device 21 for the handheld power tool 1.
[0061] However, according to further embodiments, each of the first, second, and third devices a1, a2, a3 mentioned herein may include one or more other types of devices. By way of example only, such one or more other types of devices may include one or more of a motor, electric motor, battery compartment, battery, electrical connection assembly, multiple electronic components, control device, power electronics, user interface, internal combustion engine, transmission assembly, fuel system, ignition system, cylinder, lubricant system, etc.
[0062] The first outlet o1 of the fan housing 5 is connected to the first air passage p1, and the first air passage p1 is arranged to make heat exchange contact with the first device a1. As described above, according to the illustrated embodiment, the first device a1 includes a motor 3. Therefore, according to the illustrated embodiment, the first air passage p1 of the three separate air passages p1, p2, p3 is configured to cool the motor 3. As explained in more detail below, according to the illustrated embodiment, the first outlet o1 forms an axial outlet, which means that air in contact with... Figure 5 The air flows into the first air channel p1 through the first outlet o1 in the same direction as the viewing direction. Furthermore, in Figure 5 In the schematic diagram of the cooling system 6 shown, the flow direction through the first air passage p1 is consistent with the rotation axis Ax of the fan unit 7, that is, consistent with the rotation axis Ax of the fan unit 7.
[0063] According to the illustrated embodiment, the first air passage p1 extends through the motor 3. Since the motor 3 is an electric motor according to the illustrated embodiment, the first air passage p1 may extend through and / or pass through the windings of the electric motor. Furthermore, the first air passage p1 may extend through the space between the stator and rotor of the motor 3. Alternatively or additionally, the first air passage p1 may extend around at least a portion of the housing of the motor 3. The air outlet o1' of the first air passage p1 is... Figure 5 It is schematically shown in the diagram, and it is also visible in... Figure 1 As shown in the image.
[0064] The second outlet o2 of the fan housing 5 is connected to the second air passage p2, and the second air passage p2 is arranged to have heat exchange contact with the second device a2. As described above, according to the illustrated embodiment, the second device a2 includes a battery compartment 11. Therefore, according to the illustrated embodiment, the second air passage p2 of the three separate air passages p1, p2, p3 is configured to cool the battery compartment 11 of the handheld power tool 1, and thus also cool the battery 13 housed in the battery compartment 11. The air outlet o2' of the second air passage p2 is... Figure 5 It is schematically shown in the diagram, and it is also visible in... Figure 1 and Figure 2 The instructions are in accordance with the central government.
[0065] The third outlet o3 of the fan housing 5 is connected to the third air passage p3, and the third air passage p3 is arranged to have heat exchange contact with the third device a3. As described above, according to the illustrated embodiment, the third device a3 includes a control device 21 for the handheld power tool 1. In other words, according to the illustrated embodiment, the third air passage p3 of the three separate air passages p1, p2, and p3 is configured as a cooling control device 21. The air outlet o3' of the third air passage p3 is... Figure 5 It is schematically shown in the diagram, and is also visible in... Figure 1 As shown in the image.
[0066] According to the illustrated embodiment, the control arrangement 21 of the handheld power tool 1 includes power electronics 23 configured to regulate the power supply to the motor 3. More specifically, according to the illustrated embodiment, the power electronics 23 is configured to regulate the power supply to the motor 3 based on the actuator position of the throttling actuator 25 of the handheld power tool 1. Figure 2The throttling actuator 25 is visible and indicated. According to the illustrated embodiment, the throttling actuator 25 is arranged at the first handle h1 of the handheld power tool 1.
[0067] The control device 21 of the handheld power tool 1 may be a substitute for the power electronics 23, or may include one or more other electronic components in addition to the power electronics 23, including one or more of the following: resistors, storage units, processors, central processing units (CPUs), controllers, arithmetic logic units (ALUs), digital signal processors, application-specific integrated circuits (ASICs), circuits for digital signal processing (digital signal processors, DSPs), microcomputers, programmable logic units, microprocessors, or any other device capable of electronically performing operations in a defined manner, or other processing logic capable of interpreting and executing instructions.
[0068] According to the illustrated embodiment, the fan unit 7 is connected to the output shaft 3' of the motor 3. More specifically, according to the illustrated embodiment, the fan unit 7 is connected to the output shaft 3' of the motor 3 such that the rotation axis Ax of the fan unit 7 coincides with the rotation axis of the output shaft 3' of the motor 3. The fan unit 7 may be arranged on the output shaft 3' of the motor 3, or on a separate shaft, wherein the separate shaft is connected to or attached to the output shaft 3' of the motor 3. According to some further embodiments, the fan unit 7 may be powered by a separate motor, for example, a separate electric motor.
[0069] According to the illustrated embodiment, the second and third outlets o2 and o3 each form a radial / tangential outlet, meaning that the main airflow directions m2 and h3 passing through outlets o2 and o3 are substantially parallel to the rotation plane Rp of fan unit 7. The rotation plane Rp of fan unit 7 is perpendicular to the rotation axis Ax of fan unit 7. According to another embodiment, the angle between the rotation plane Rp of fan unit 7 and the main airflow directions m2 and m3 passing through one or both of the second and third outlets o2 and o3 can be less than 40 degrees or less than 15 degrees.
[0070] Furthermore, according to some other embodiments of this disclosure, one or both of the second outlet o2 and the third outlet o3 may be a radial outlet, a tangential outlet, and an axial outlet, or any combination thereof. A radial outlet is an outlet whose main outlet direction coincides with the radial direction of the fan unit 7, while a tangential outlet is an outlet whose main outlet direction coincides with the tangential direction of the fan unit 7.
[0071] Figure 6 It shows Figure 1 and Figure 2 A perspective view of the first side of the fan housing 5 of the cooling system 6 of the handheld power tool 1. Also in Figure 6For visibility reasons, the front part of the fan housing 5 is omitted. The first side of the fan housing 5 faces... Figure 2 The air inlet 9' of the handheld power tool 1 shown.
[0072] like Figure 6 The best visibility, and as Figure 4 and Figure 5 As also indicated, according to the illustrated embodiment, the first outlet o1 is formed by a plurality of orifices 15 provided in the wall 5' of the fan housing 5. According to the illustrated embodiment, the first outlet o1 is formed by six orifices 15 provided in the wall 5' of the fan housing 5. However, according to another embodiment, the first outlet o1 may be formed by a different number of orifices 15 provided in the wall 5' of the fan housing 5, such as a number in the range of 1 to 30 or a number in the range of 3 to 10.
[0073] exist Figure 6 The diagram shows the radial distance r15 between the rotation axis Ax of the fan unit 7 and the radially inner defining walls 15' of the plurality of orifices 15. The radial distance r15 between the rotation axis Ax of the fan unit 7 and the radially inner defining walls 15' of the plurality of orifices 15 can be measured in a plane perpendicular to the rotation axis Ax between the radially inner defining walls 15' and the rotation axis Ax. Figure 5 The diagram also shows the radial distance r15 between the rotation axis Ax of the fan unit 7 and the radially inner defining wall 15' of the plurality of orifices 15.
[0074] like Figure 4 and Figure 5 As shown, the fan unit 7 includes multiple fan blades 8. Furthermore, as... Figure 5 As shown, according to the illustrated embodiment, the radial extension range r8 of the plurality of fan blades 8 is greater than the radial distance r15 between the rotation axis Ax of the fan unit 7 and the radially inner defining wall 15' of the plurality of orifices 15. Therefore, effective air pumping can be ensured through the plurality of orifices 15 of the first outlet o1.
[0075] like Figure 4 and Figure 5 As shown, according to the illustrated embodiment, the fan unit 7 includes an axial end disc 10. The axial end disc 10 faces the wall 5' of the fan housing 5. Furthermore, as... Figure 5As shown, the radial extension range r10 of the axial end plate 10 is less than the radial distance r15 between the rotation axis Ax of the fan unit 7 and the radially inner defining wall 15' of the plurality of orifices 15. Therefore, effective air pumping can be ensured through the plurality of orifices 15 of the first outlet o1. Furthermore, the axial end plate 10 can improve the operating efficiency of the fan unit 7 by reducing the air turbulence flowing radially between the blades 8, especially in the boundary layer near the axial end plate 10.
[0076] Figure 7 It shows Figure 1 and Figure 2 A perspective view of the second side of the fan housing 5 of the cooling system 6 of the handheld power tool 1 is shown. Also in Figure 7 The front part of the fan housing 5 is omitted in the original text. Figure 5 In the schematic diagram of the cooling system 6 shown, the second side of the fan housing 5 faces the motor 3 and the first air passage p1.
[0077] like Figure 7 As shown, according to the illustrated embodiment, the fan housing 5 includes a plurality of air guiding members 17. The air guiding members 17 may also be referred to as guide vanes, stator vanes, or stator blades. According to the illustrated embodiment, the plurality of air guiding members 17 protrude from a second side of the fan housing 5 and may at least partially protrude into a first air passage of the power tool's cooling system.
[0078] According to the illustrated embodiment, the fan housing 5 includes four air guiding members 17. However, according to a further embodiment, the fan housing 5 may include other numbers of air guiding members 17, such as in the range of 1 to 20 or in the range of 3 to 10.
[0079] According to the illustrated embodiment, each of the plurality of air guide members 17 is arranged adjacent to one of the plurality of orifices 15. The plurality of air guide members 17 are arranged to deflect airflow to pass through the first outlet o1. Due to the presence of the plurality of air guide members 17, the overall operating efficiency of the fan assembly can be improved. Furthermore, a sufficient and stable airflow rate through the first outlet o1 can be ensured under various operating conditions of the power tool.
[0080] As described above, according to the illustrated embodiment, the first outlet o1 forms an axial outlet. The term axial outlet, as used herein, can mean an angle less than 40 degrees or less than 15 degrees between the main airflow direction m1 passing through outlet o1 and the rotation axis Ax of the fan unit 7, measured at least at a distance from outlet o1. According to another embodiment, the first outlet o1 can form a radial outlet, a tangential outlet, or any combination of radial, tangential, and axial outlets.
[0081] Simultaneously refer to Figures 1 to 7 Please explain the following. As stated above, and as... Figure 1 As shown, according to the illustrated embodiment, the power tool 1 includes three separate air outlets o1', o2', and o3', each air outlet configured to discharge air from one of the three separate air channels p1, p2, and p3 to the surrounding environment. The air outlet o1' of the first air channel p1 can be referred to as the first air outlet o1', the air outlet o2' of the second air channel p2 can be referred to as the second air outlet o2', and the air outlet o3' of the third air channel p3 can be referred to as the third air outlet o3'.
[0082] According to the illustrated embodiment, the first air outlet o1' is formed by an opening in the housing of the handheld power tool 1, the opening being positioned adjacent to the attachment portion of the second handle h2. However, according to a further embodiment, the first air outlet o1' may be formed by multiple openings, and the first air outlet o1' may be in a different configuration than... Figure 1 The position is shown on the handheld power tool 1.
[0083] The second air outlet o2' of the handheld power tool 1 Figure 1 and Figure 2 It is visible in the middle. According to the illustrated embodiment, the second air outlet o2' is formed by a plurality of orifices provided in a portion of the handheld power tool 1 adjacent to the user interface assembly 27 of the handheld power tool 1. The user interface assembly 27 of the handheld power tool 1 is in Figure 2 As shown in the image.
[0084] However, according to other embodiments, the second air outlet o2' of the handheld power tool 1 may be formed by a single orifice. Furthermore, the second air outlet o2' may be different from... Figure 1 and Figure 2 The position is shown on the handheld power tool 1.
[0085] The third air outlet o3' of the handheld power tool 1 Figure 1 As can be seen in the diagram. According to the illustrated embodiment, the second air outlet o2' is formed by a slotted opening provided in the housing of the handheld power tool 1, the slotted opening being adjacent to the tool portion 30' of the power tool 1.
[0086] However, according to other embodiments, the third air outlet o3' of the handheld power tool 1 can be formed by a number of other orifices that may have a shape different from the slot shape. Furthermore, according to a further embodiment, the third air outlet o3' of the handheld power tool 1 can be in a shape different from... Figure 1 The position is shown on the handheld power tool 1.
[0087] As will be apparent from the description herein, according to the illustrated embodiment, the fan housing 5 includes an inlet 9 and three separate outlets o1, o2, o3. However, according to other embodiments, the fan housing 5 may include more than one inlet 9. Similarly, according to another embodiment, the fan housing 5 includes more than three separate outlets o1, o2, o3. In other words, in addition to the three separate outlets o1, o2, o3 described herein, the fan housing 5 may also include one or more additional outlets. Such one or more additional outlets may be radial outlets, tangential outlets, or axial outlets, or combinations thereof.
[0088] Furthermore, the handheld power tool 1 may include one or more additional air channels in addition to the three separate air channels p1, p2, p3 described herein. Each of these one or more additional air channels may be connected to an additional outlet of the fan housing 5 (as described above). Furthermore, each of these one or more additional air channels may be configured to cool an additional device separate from the first, second, and third devices a1, a2, a3 described herein. Additionally, each of these one or more additional air channels may be connected to one of the first, second, or third air outlets o1', o2', o3' of the handheld power tool 1, or to a separate air outlet that is different from / separate from each of the first, second, and third air outlets o1', o2', o3' of the handheld power tool 1 described herein.
[0089] It should be understood that the foregoing is a description of different exemplary embodiments, and the invention is defined only by the appended independent claims. Those skilled in the art will recognize that exemplary embodiments can be modified, and different features of exemplary embodiments can be combined to produce embodiments other than those described herein, without departing from the scope of the invention as defined by the appended claims.
[0090] As used herein, the terms “comprising” or “including” are open-ended and include one or more of the stated features, elements, steps, components, or functions, but do not exclude the presence or addition of one or more other features, elements, steps, components, functions, or groups thereof.
Claims
1. A handheld power tool (1) comprising a motor (3) configured to provide power to the handheld power tool (1), wherein, The power tool (1) includes a fan housing (5) and a fan unit (7). The fan housing (5) includes an inlet (9) and three separate outlets (o1, o2, o3). The fan unit (7) is arranged to rotate within the fan housing (5) during operation of the power tool (1) to generate airflow from the inlet (9) to each of the three separate outlets (o1, o2, o3). The power tool (1) further includes three separate air channels (p1, p2, p3), each of which is connected to one of the three separate outlets (o1, o2, o3). Each of the three separate air channels (p1, p2, p3) is configured to cool a corresponding device (a1, a2, a3) of the power tool (1).
2. The handheld power tool (1) according to claim 1, wherein, The motor (3) of the power tool (1) is an electric motor, and wherein the first air passage (p1) of the three separate air passages (p1, p2, p3) is configured to cool the motor (3).
3. The handheld power tool (1) according to claim 2, wherein, The power tool (1) includes a battery compartment (11) configured to house a battery (13) for supplying power to the motor (3), and wherein a second air passage (p2) of the three separate air passages (p1, p2, p3) is configured to cool the battery compartment (11).
4. The handheld power tool (1) according to any one of the preceding claims, wherein, The power tool (1) includes a control device (21), and wherein the third air passage (p3) of the three separate air passages (p1, p2, p3) is configured to cool the control device (21).
5. The handheld power tool (1) according to claim 4, wherein, The motor (3) of the power tool (1) is an electric motor, and the control device (21) includes a power electronics (23) configured to regulate the power supply to the motor (3).
6. The handheld power tool (1) according to any one of the preceding claims, wherein, The fan unit (7) is connected to the output shaft (3') of the motor (3).
7. The handheld power tool (1) according to any one of the preceding claims, wherein, The fan unit (7) is a radial fan unit.
8. The handheld power tool (1) according to any one of the preceding claims, wherein, The first outlet (o1) of the three separate outlets (o1, o2, o3) forms an axial outlet.
9. The handheld power tool (1) according to claim 8, wherein, The first outlet (o1) is formed by a plurality of openings (15) provided in the wall (5') of the fan housing (5).
10. The handheld power tool (1) according to claim 9, wherein, The fan housing (5) includes a plurality of air guide members (17), each of the air guide members being arranged adjacent to one of the plurality of orifices (15), and wherein the plurality of air guide members (17) are arranged to deflect airflow to pass through the first outlet (o1).
11. The handheld power tool (1) according to claim 9 or 10, wherein, The fan unit (7) includes a plurality of fan blades (8), wherein the radial extension range (r8) of the plurality of fan blades (8) is greater than the radial distance (r15) between the rotation axis (Ax) of the fan unit (7) and the radial inner defining wall (15') of the plurality of orifices (15).
12. The handheld power tool (1) according to any one of claims 9 to 11, wherein, The fan unit (7) includes an axial end plate (10), wherein the axial end plate (10) faces the wall (5') of the fan housing (5).
13. The handheld power tool (1) according to claim 12, wherein, The radial extension range (r10) of the axial end plate (10) is less than the radial distance (r15) between the rotation axis (Ax) of the fan unit (7) and the radial inner defining wall (15') of the plurality of orifices (15).
14. The handheld power tool (1) according to any one of claims 8 to 13, wherein, The motor (3) of the power tool (1) is an electric motor, wherein the first outlet (o1) is connected to the first air passage (p1) of the three separate air passages (p1, p2, p3), and wherein the first air passage (p1) is configured to cool the motor (3).
15. The handheld power tool (1) according to any one of the preceding claims, wherein, The second outlet (o2) of the three separate outlets (o1, o2, o3) forms a radial outlet, a tangential outlet, or a combination of radial and tangential outlets.
16. The handheld power tool (1) according to claim 15, wherein, The power tool (1) includes a battery compartment (11) configured to house a battery (13) for supplying power to the motor (3), wherein the second outlet (o2) is connected to the second air passage (p2) of the three separate air passages (p1, p2, p3), and wherein the second air passage (p2) is configured to cool the battery compartment (11).
17. The handheld power tool (1) according to any one of the preceding claims, wherein, The third outlet (o3) of the three separate outlets (o1, o2, o3) forms a radial outlet, a tangential outlet, or a combination of radial and tangential outlets.
18. The handheld power tool (1) according to claim 17, wherein, The power tool (1) includes a control device (21), wherein the third outlet (o3) is connected to the third air passage (p3) of the three separate air passages (p1, p2, p3), and wherein the third air passage (p3) is configured to cool the control device (21).
19. The handheld power tool (1) according to any one of the preceding claims, wherein, The power tool (1) includes three separate air outlets (o1', o2', o3'), each of which is configured to discharge air from one of the three separate air channels (p1, p2, p3) to the surrounding environment.
20. The handheld power tool (1) according to any one of the preceding claims, wherein, The power tool (1) is configured to be selected from the group consisting of: chainsaw, power cutter, trimmer, hedge trimmer, combination trimmer and blade / debris blower.