A jigsaw
Patent Information
- Application Number
- CN202521949547.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-09
AI Technical Summary
但这种方式中，散热孔在进行气流循环的同时，也会将外部环境中的大量粉尘、碎屑吸入机壳内部，从而造成电机、齿轮等传动部件的磨损，降低工具的使用寿命；严重时，大量的外部碎屑甚至还会堵塞风道，反而影响曲线锯的散热效果
本申请文件中所提供的曲线锯，通过在曲线锯内部形成彼此间连通的第一风道、第二风道、第三风道，以及风道切换装置，其中，第一风道为吹尘风道，第二风道为吸尘风道，第三风道为散热风道，通过可水平移动的风道切换装置切换各风道的流通或封闭状态，从而改变曲线锯的工作模式即吹尘模式、吸尘模式。第三风道作为独立的散热风道，当曲线锯处于吸尘模式时，第一风道封闭，此时，曲线锯内部的电机、风扇所产生的热量可通过散热风道流出曲线锯，达到为曲线锯散热的目的。同时，通过在第三风道内设置风道循环孔，其可允许第三风道内的气流通过风道循环孔进入曲线锯传动腔。当曲线锯处于吹尘模式时，风道循环孔可作为进气口允许气流自第三风道出口流经风道循环孔进入曲线锯传动腔；当曲线锯处于吸尘模式时，部分从第三风道流出的气流还可通过风道循环孔重新进入曲线锯传动腔，形成部分气流的循环流动，从而达到更均衡、更持续的温度控制，达到更好的散热效果。此外，气流的循环流动也使得能耗更低，在曲线锯的作业过程中，所产生的风噪也更小，对于曲线锯的工作性能以及用户的使用体验，都有极大的提升。
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Figure CN224658275U_ABST
Abstract
Description
Technical Field
[0001] This application relates to a jigsaw, and more specifically to a jigsaw with a dust blowing and suction mode switching function. Background Technology
[0002] A jigsaw is a power tool with a reciprocating saw blade used to cut curves of different shapes. It mainly uses a reciprocating rod to hold the saw blade and a transmission structure to drive the reciprocating rod to move up and down, thereby driving the saw blade to perform reciprocating cutting actions.
[0003] Most jigsaws on the market have switchable blowing and suction modes, both used to remove the large amount of chips generated during cutting. The blowing mode typically uses the airflow generated by the internal cooling fan to blow away the chips; the suction mode typically uses an external suction attachment attached to the jigsaw housing. Therefore, in suction mode, the airflow generated by the cooling fan cannot effectively flow out or circulate, limiting its cooling effect on the internal transmission structure. A common solution is to directly install multiple ventilation holes on the jigsaw housing to create airflow circulation with the internal space, thus achieving a cooling effect. However, this method, while circulating airflow, also draws a large amount of dust and debris from the external environment into the housing, causing wear on the motor, gears, and other transmission components, reducing the tool's lifespan. In severe cases, a large amount of external debris can even block the airflow channels, further hindering the jigsaw's cooling performance. Furthermore, the open holes allow external moisture and liquids to easily enter the tool, resulting in poor moisture and water resistance, and even damaging internal electronic components or metal parts. Utility Model Content
[0004] The purpose of this application is to provide a jigsaw with blowing and suction modes and better heat dissipation and protection performance.
[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a jigsaw is provided, including a housing, a reciprocating rod, and a saw blade held by the reciprocating rod. The housing has a transmission cavity inside for accommodating a motor, a fan, and a reciprocating rod drive structure. The reciprocating rod drive structure can convert the rotational motion of the motor into the up-and-down reciprocating motion of the reciprocating rod, thereby driving the saw blade to perform cutting operations. The jigsaw is characterized in that it further includes a first air duct, a second air duct, and a third air duct formed inside the housing and interconnected with each other. At least two of the first air duct, the second air duct, and the third air duct are provided with an air duct switching device. The air duct switching device includes a push button that is at least partially exposed to the housing and a conversion component located inside the housing. The conversion component can move horizontally under the action of the push button to control the switching of the first air duct, the first air duct, and the third air duct in a flowing state or a closed state.
[0006] Furthermore, the first air duct is a dust blowing air duct, which includes a first air duct inlet adjacent to the fan and a first air duct outlet adjacent to the cut; the second air duct is a dust suction air duct, which includes a second air duct inlet communicating with the first air duct and a second air duct outlet communicating with the outside of the housing; the third air duct is a heat dissipation air duct, which includes a third air duct inlet communicating with the first air duct and a third air duct outlet communicating with the outside of the housing; wherein, the third air duct is disposed adjacent to the second air duct and separated by a partition plate, and the third air duct can maintain the same flow state or closed state as the second air duct under the action of the conversion element.
[0007] Furthermore, the conversion element is disposed at a position where the first air duct, the second air duct, and the third air duct are connected to each other, and can be switched between a first position and a second position; when the conversion element is in the first position, the first air duct is in a flowing state, and the second air duct and the third air duct are in a closed state; when the conversion element is in the second position, the first air duct is in a closed state, and the second air duct and the third air duct are in a flowing state.
[0008] Furthermore, one end of the conversion component is provided with a sealing plate. When the conversion component is in the first position, the sealing plate can completely seal the second air duct inlet and the third air duct inlet, and form part of the side wall of the first air duct.
[0009] As another preferred embodiment, the conversion component is further provided with a guide plate extending horizontally away from the direction of the saw blade; along a direction perpendicular to the vertical plane where the saw blade is located, both sides of the guide plate are provided with downwardly extending baffles, and a flow guiding cavity is formed between the guide plate and the baffles; when the conversion component is in the second position, the guide plate can close the first air duct, and its first end away from the first air duct is at least partially and tightly fitted with the partition plate, so that the inlet of the second air duct and the inlet of the third air duct are separated and both are in a flow state.
[0010] Furthermore, the second end of the guide plate near the first air duct is configured as an arc shape.
[0011] Furthermore, the second end has at least one arc-shaped vertical guide plate on the side facing away from the first air duct, and the guide plate has a curved sheet structure.
[0012] As another preferred embodiment, one of the baffles is provided with an extension arm at one end away from the closing plate and in a horizontal direction, the extension arm having at least one push button mounting slot; the push button has at least one snap-fit arm that can snap into the push button mounting slot, thereby achieving a fixed connection between the push button and the conversion component to allow the conversion component to move horizontally under the action of the push button.
[0013] As another preferred embodiment, the upper sidewall of the third air duct has a circulating hole that communicates with the transmission cavity to allow airflow in the third air duct to flow back into the transmission cavity.
[0014] Furthermore, the partition plate below the air duct circulation hole is provided with wind-blocking ribs.
[0015] Compared with the prior art, the beneficial effects of this application are as follows: The jigsaw provided in this application comprises three interconnected air ducts—a first, a second, and a third—and an air duct switching device. The first air duct is for blowing dust, the second for suction dust, and the third for cooling. The horizontally movable air duct switching device allows the jigsaw to switch between open and closed states, thereby changing its operating mode—blowing or suction dust mode. The third air duct, acting as an independent cooling duct, allows the first air duct to close when the jigsaw is in suction dust mode. In this mode, heat generated by the motor and fan inside the jigsaw can escape through the cooling duct, thus cooling the jigsaw. Simultaneously, by providing air circulation holes within the third air duct, airflow within the third air duct can enter the jigsaw's drive chamber through these holes. When the jigsaw is in dust blowing mode, the air duct circulation hole acts as an air inlet, allowing airflow to enter the jigsaw's drive chamber from the third air duct outlet. When the jigsaw is in vacuuming mode, some of the airflow exiting the third air duct can re-enter the jigsaw's drive chamber through the air duct circulation hole, creating partial airflow circulation. This results in more balanced and continuous temperature control, leading to better heat dissipation. Furthermore, the airflow circulation also reduces energy consumption and wind noise during jigsaw operation, significantly improving both the jigsaw's performance and the user experience. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the entire jigsaw.
[0017] Figure 2 This is a schematic diagram of the internal structure of a jigsaw;
[0018] Figure 3 This is a schematic diagram of the dust blowing mode for a jigsaw.
[0019] Figure 4 This is a magnified schematic diagram of the dust blowing mode of a jigsaw.
[0020] Figure 5 This is a schematic diagram of the jigsaw's dust extraction mode;
[0021] Figure 6 This is a magnified schematic diagram of the jigsaw's dust extraction mode.
[0022] Figure 7 This is a schematic diagram of the jigsaw's dust extraction mode from another angle;
[0023] Figure 8 This is a magnified view of another angle of the jigsaw's dust collection mode;
[0024] Figure 9 This is a magnified view of another part of the jigsaw vacuuming mode from another angle.
[0025] Figure 10 This is a schematic diagram of the conversion component structure;
[0026] Figure 11 This is a schematic diagram of the conversion component from another angle;
[0027] Figure 12 This is a schematic diagram of the push button structure. Detailed Implementation
[0028] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0029] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0030] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.
[0031] In the description of this application, it should be noted that directional terms such as “center”, “lateral”, “longitudinal”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, and “counterclockwise” indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.
[0032] This application provides a jigsaw 1, see [link]. Figures 1 to 9The jigsaw 1 includes a housing 20, a reciprocating rod 60, and a saw blade 70 held by the reciprocating rod 60. The housing 20 has a transmission cavity 23 for accommodating a motor 30, a fan 40, and a reciprocating rod drive structure 50. The reciprocating rod drive structure 50 converts the rotational motion of the motor 30 into the up-and-down reciprocating motion of the reciprocating rod 60, thereby driving the saw blade 70 to perform cutting operations. The jigsaw 1 also includes a first air duct 11, a second air duct 12, and a third air duct 13, all at least partially connected within the housing 20. An air duct switching device 10 is provided between at least two of the three air ducts. The air duct switching device 10 includes a push button 101 at least partially exposed within the housing 20 and a conversion element 102 located inside the housing 20. The conversion element 102 can move horizontally under the action of the push button 101 to control the switching of the first air duct 11, the second air duct 12, and the third air duct 13 between a flowing state and a closed state. Users can operate the push button 101 to move the internal conversion element 102, thereby switching the air ducts between a flowing state and a closed state, and thus switching the working mode of the jigsaw 1, namely the dust suction mode or the dust blowing mode.
[0033] See Figure 2 In this embodiment, the first air duct 11, the second air duct 12, and the third air duct 13 are all formed in the housing 20. It is understood that the housing 20 includes a front housing 21 (not shown in the figure) and a rear housing 22 disposed opposite to each other; for ease of illustration and description, Figures 2 to 5 Only the rear housing 22 is shown. The first air duct 11 is a dust-blowing duct, having a first air duct inlet 111 adjacent to the fan 40 and a first air duct outlet 112 adjacent to the cutting area. Airflow flows from the first air duct inlet 111 along the first air duct 11 to the first air duct outlet 112, i.e., the cutting area of the jigsaw 1, to remove dust. The second air duct 12 is a dust-suction duct, having a second air duct inlet 121 connected to the first air duct 11 and a second air duct outlet 122 connected to the outside of the housing 20. The second air duct inlet 121 is connected to the first air duct 11, meaning it can be connected to the cutting area of the jigsaw 1. The second air duct outlet 122 can be connected to an external dust-suction device, such as a vacuum cleaner 80, allowing the vacuum cleaner 80 to suction out the debris at the cutting area. The third air duct 13 is a heat dissipation air duct, which has a third air duct inlet 131 communicating with the first air duct 11 and a third air duct outlet 132 communicating with the outside of the housing 20. The third air duct 13 is disposed adjacent to and above the second air duct 12, and the two are separated by a partition plate 14. The third air duct 13 can maintain the same flow state or closed state as the second air duct 12 under the action of the conversion member 102. That is to say, in this embodiment, the first air duct 11, the second air duct 12 and the third air duct 13 are interconnected.
[0034] Specifically, see Figure 1 and Figure 9 The conversion element 102 is positioned where the three air ducts communicate with each other. The housing 20 has a horizontally extending opening (not shown in the figure) corresponding to the push button 101. The operating part 1011 of the push button 101 is exposed through this opening. The user can control the push button 101 to move horizontally within the opening via the operating part 1011, thereby causing the conversion element 102 inside the housing 20 to move horizontally synchronously and switch between a first position and a second position. In this embodiment, when the push button 101 moves to the rightmost side of the opening, the conversion element 102 is in the first position; when the push button 101 moves to the leftmost side of the opening, the conversion element 102 is in the second position. See also... Figure 3 and Figure 4 When the conversion element 102 is in the first position, the first air duct 11 is in a flowing state, while the second air duct 12 and the third air duct 13 are in a closed state. At this time, the jigsaw 1 is in dust-blowing mode, and the airflow can flow within the first air duct 11. In other words, the airflow can flow from the first air duct inlet 111, i.e., near the fan 40, along the first path a to the first air duct outlet 112, i.e., the cutting point, and act on the debris at the cutting point, thus achieving the dust-blowing function at the cutting point. See also Figures 5 to 9 When the conversion element 102 is in the second position, the first air duct 11 is closed, while the second air duct 12 and the third air duct 13 are both in a free-flowing state. At this time, the jigsaw 1 is in vacuuming mode, and the debris at the cutting point can flow into the vacuum cleaner 80 along the second path b under the suction of the vacuum cleaner 80, thus achieving the function of vacuuming the cutting point. At the same time, the heat generated inside the jigsaw 1, such as by the motor, will flow out through the third air duct 13 along the third path c, thereby achieving the purpose of heat dissipation for the jigsaw 1.
[0035] See Figures 3 to 11 In this embodiment, the conversion element 102 is generally L-shaped, and one end of the conversion element 102 is provided with a generally arc-shaped sealing plate 1023, the shape of which is roughly adapted to the side wall of the first air duct 11. See also Figure 3 and Figure 4 When the conversion component 102 is in the first position, i.e. the jigsaw 1 is in the dust blowing mode, the sealing plate 1023 can completely seal the second air duct inlet 121 and the third air duct inlet 131, and form part of the side wall of the first air duct 11. At this time, the airflow generated by the fan 40 will only flow out through the first air duct 11 and act on the debris at the cutting point along the first path a, thereby achieving dust blowing at the cutting point.
[0036] In this embodiment, the conversion member 102 further includes a guide plate 1024 extending horizontally away from the saw blade 70. Along a direction perpendicular to the vertical plane of the saw blade 70, both sides of the guide plate 1024 are provided with downwardly extending baffles 10243, forming a guide cavity 1025 between the guide plate 1024 and the baffles 10243. See also Figures 5 to 9 When the conversion component 102 is in the second position, i.e. the jigsaw 1 is in the dust suction mode, the sealing plate 1023 is tightly attached to the other side wall of the first air duct 11, and the guide plate 1024 can block the first air duct 11, i.e., close the first air duct 11. The first end 10241 of the guide plate 1024 away from the first air duct 11 is at least partially tightly attached to the partition plate 14, so that the second air duct inlet 121 and the third air duct inlet 131 are separated and both are in the flow state, i.e. the first air duct 11 is in the closed state, and the second air duct 12 and the third air duct 13 are in the flow state. At this time, the airflow generated by the fan 40 can flow from the third air duct inlet 131 along the third path c to the third air duct outlet 132, i.e., the outside of the housing 20, under the guidance of the guide plate 1024, thereby achieving the purpose of heat dissipation for the jigsaw 1; at the same time, the debris at the cutting point can flow from the cutting point to the second air duct inlet 121 and along the second path b to the second air duct outlet 122, i.e., the vacuum cleaner 80, under the suction of the vacuum cleaner 80 and the guidance of the guide cavity 1025, thereby achieving the purpose of dust removal and debris removal.
[0037] Preferably, in this embodiment, see Figure 9 and Figure 10 The sealing plate 1023 extends downward and connects with the two baffles 10243, and together with the guide plate 1024 and the two baffles 10243, defines the guide cavity 1025.
[0038] Further preferred options, for better airflow guidance, see [link to relevant documentation]. Figures 5 to 11 In this embodiment, the second end 10242 of the guide plate 1024 near the first air duct 11 is set to be arc-shaped.
[0039] Furthermore, the second end 10242, on the side facing away from the first air duct 11, is provided with at least one arc-shaped vertical air guide plate 1026, which has a curved sheet structure. In this embodiment, the outline of the air guide plate 1026 is adapted to the arc of the second end 10242, and in order to adapt to the rotation direction of the fan blades of the fan 40, the air guide plate 1026 is bent towards the rear housing 22. Thus, under the joint guidance of the guide plate 1024 and the air guide plate 1026, the airflow generated by the fan 40 will flow more smoothly into the third air duct 13, achieving better heat dissipation. In this embodiment, the number of air guide plates 1026 is three, and the three air guide plates 1026 are evenly spaced. It is understood that in other embodiments, when the fan blades of the fan 40 rotate in another direction, the air guide plate 1026 can also be configured to be bent in the direction away from the rear housing 22, or not configured to be arc-shaped, but rather as a vertical sheet that is vertical and tilted in the direction away from the rear housing 22, as long as it can play the role of guiding airflow, there is no limitation here, and the number and spacing of the air guide plates 1026 can also be freely set.
[0040] To achieve the connection between the push button 101 and the conversion element 102, see [reference needed]. Figures 10 to 12 One of the baffles 10243 of the converter 102 has an extension arm 1021 at one end away from the closing plate 1023 and in a horizontal direction. The extension arm 1021 has at least one push button mounting groove 1022. Correspondingly, the push button 101 has at least one snap-fit arm 1012, which can snap into the push button mounting groove 1022, thereby achieving a fixed connection between the push button 101 and the converter 102, so as to allow the converter 102 to move horizontally under the action of the push button 101. In this embodiment, two push button mounting slots 1022 are provided, symmetrically arranged on the extension arm 1021, each having an opening facing vertically upward and vertically downward, respectively. Correspondingly, two spaced-apart locking arms 1012 are provided on the side of the push button 101 facing away from the operating part 1011. The two locking arms 1012 can be respectively locked into the two push button mounting slots 1022, thereby achieving a fixed connection between the push button 101 and the conversion member 102, allowing the conversion member 102 to move horizontally under the drive of the push button 101. It is understood that in other embodiments, the push button mounting slot 1022 can also be provided as one, and correspondingly, only one locking arm 1012 can be provided. In addition, the push button mounting slot 1022 can also be provided as a non-opening form, such as a closed hole, as long as it can meet the synchronous movement of the push button 101 and the conversion member 102.
[0041] It is understandable that, in order to better achieve airflow circulation inside the jigsaw 1, the housing 20 is also provided with several air inlets 201. In this embodiment, see... Figures 1 to 2 The air inlet 201 is positioned adjacent to the outlet 132 of the third air duct. More preferably, to prevent dust and debris from the external environment from entering the jigsaw 1 through the air inlet 201, the air inlet 201 is positioned from bottom to top. In this way, airflow can enter the jigsaw 1 through the air inlet 201, flow through the motor 30 and fan 40, and then exit through the first air duct 11 or the third air duct 13, serving to blow away dust or dissipate heat. Simultaneously, the bottom-up angle also filters out most of the dust and debris from the external environment, providing better protection.
[0042] For further details, see Figures 3 to 9 The upper sidewall of the third air duct 13 is also provided with an air duct circulation hole 133, which communicates with the transmission cavity 23 to allow airflow in the third air duct 13 to re-enter the transmission cavity 23. Specifically, in this embodiment, the jigsaw 1 also includes a circuit board 90 arranged in the transmission cavity 23 and adjacent to the third air duct 13. It is understood that the third air duct outlet 132 allows both airflow out and airflow in. See also Figure 3 and Figure 4When the conversion element 102 is in the first position, i.e., the jigsaw 1 is in dust-blowing mode, external airflow can enter the jigsaw 1 from the air inlet 201 and flow through the motor 30 and fan 40. It can also enter the third air duct 13 through the third air duct outlet 132 and flow into the transmission chamber 23 through the air duct circulation hole 133. That is, the air duct circulation hole 133 can act as an air inlet, allowing external airflow to enter the transmission chamber 23 inside the jigsaw 1 from the third air duct outlet 132 through the air duct circulation hole 133. Then, it flows sequentially through the circuit board 90, motor 30, and fan 40, and finally flows through the first air duct inlet 111 via the first path a to the cutting area, ultimately achieving dust blowing. During this process, the airflow cools the circuit board 90 and motor 30, achieving a heat dissipation effect. (See also...) Figure 5 and Figure 9 When the conversion component 101 is in the second position, i.e., when the jigsaw 1 is in vacuum mode, external airflow can also enter the transmission cavity 23 from the air inlet 201 and flow through the motor 30 and fan 40, carrying away the heat generated and achieving a cooling effect. Then, the airflow flows through the third air duct 13 along the third path c to the third air duct outlet 132. During this process, part of the airflow flowing out of the third air duct 13 will flow back into the transmission cavity 23 inside the jigsaw 1 through the air duct circulation hole 133, and flow through the circuit board 90, motor 30 and fan 40 again, and finally flow out through the third air duct 13, thus forming a certain airflow circulation to achieve a better heat dissipation effect.
[0043] Further, see Figures 2 to 9 A baffle 134 is also provided on the partition plate 14 below the air circulation hole 133. In this way, in the dust blowing mode and dust suction mode of the jigsaw 1, the baffle 134 can better guide the airflow in the third air duct 13 from the air circulation hole 133 into the interior of the jigsaw 1. Preferably, the baffle 134 is cylindrical in shape.
[0044] In this application, by setting a third air duct 13 inside the jigsaw 1, the third air duct 13 can act as an independent heat dissipation duct in the dust extraction mode of the jigsaw 1, allowing airflow to flow out and remove most of the heat inside the jigsaw 1, thus achieving better heat dissipation. In addition, by setting an air duct circulation hole 133 inside the third air duct 13, airflow is allowed to re-enter the jigsaw 1 through the air duct circulation hole 133, realizing partial airflow circulation, thereby achieving more balanced and continuous temperature control. At the same time, the airflow circulation also results in lower energy consumption and less wind noise generated during the operation of the jigsaw 1, which greatly improves both the working performance of the jigsaw and the user experience.
[0045] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.
Claims
1. A jigsaw, comprising a housing, a reciprocating rod, and a saw blade held by the reciprocating rod, wherein the housing has an internal transmission cavity for accommodating a motor, a fan, and a drive structure for the reciprocating rod, wherein... The reciprocating rod drive structure can convert the rotational motion of the motor into the up-and-down reciprocating motion of the reciprocating rod, thereby driving the saw blade to perform cutting operations. Its characteristic is that... The jigsaw also includes a first air duct, a second air duct, and a third air duct formed inside the housing and connected to each other. At least two of the first air duct, the second air duct, and the third air duct are provided with an air duct switching device. The air duct switching device includes a push button that is at least partially exposed to the housing and a conversion element located inside the housing. The conversion element can move horizontally under the action of the push button to control the switching of the first air duct, the first air duct, and the third air duct in a flowing state or a closed state.
2. The jigsaw as described in claim 1, characterized in that, The first air duct is a dust blowing air duct, which includes a first air duct inlet adjacent to the fan and a first air duct outlet adjacent to the cut; The second air duct is a dust extraction air duct, which includes a second air duct inlet communicating with the first air duct and a second air duct outlet communicating with the outside of the housing; The third air duct is a heat dissipation air duct, which includes a third air duct inlet that communicates with the first air duct and a third air duct outlet that communicates with the outside of the housing. The third air duct is disposed adjacent to the second air duct and separated by a partition plate. The third air duct can maintain the same flow state or closed state as the second air duct under the action of the conversion element.
3. The jigsaw as described in claim 2, characterized in that, The conversion element is disposed at a position where the first air duct, the second air duct, and the third air duct are connected to each other, and can be switched between a first position and a second position. When the conversion element is in the first position, the first air duct is in a flowing state, and the second air duct and the third air duct are in a closed state; when the conversion element is in the second position, the first air duct is in a closed state, and the second air duct and the third air duct are in a flowing state.
4. The jigsaw as described in claim 3, characterized in that, One end of the conversion component is provided with a sealing plate. When the conversion component is in the first position, the sealing plate can completely seal the second air duct inlet and the third air duct inlet, and form part of the side wall of the first air duct.
5. The jigsaw as described in claim 4, characterized in that, The conversion component is also provided with a guide plate that extends horizontally and is away from the direction of the saw blade; Along a direction perpendicular to the vertical plane where the saw blade is located, both sides of the guide plate are provided with downwardly extending baffles, and a guide cavity is formed between the guide plate and the baffles; When the conversion element is in the second position, the guide plate can close the first air duct, and its first end away from the first air duct is at least partially and tightly fitted with the partition plate, so that the second air duct inlet and the third air duct inlet are separated and both are in a flow state.
6. The jigsaw as described in claim 5, characterized in that, The second end of the guide plate near the first air duct is set in an arc shape.
7. The jigsaw as described in claim 6, characterized in that, The second end has at least one arc-shaped vertical guide plate on the side facing away from the first air duct, and the guide plate has a curved sheet structure.
8. The jigsaw as described in claim 5, characterized in that, One of the baffles is provided with an extension arm at one end away from the closing plate and in a horizontal direction, and the extension arm is provided with at least one push button mounting groove; The push button is provided with at least one snap-fit arm, which can snap into the push button mounting slot to achieve a fixed connection between the push button and the conversion component, so that the conversion component can move horizontally under the action of the push button.
9. The jigsaw as described in claim 2, characterized in that, The upper sidewall of the third air duct has a circulation hole that connects to the transmission cavity to allow airflow in the third air duct to flow back into the transmission cavity.
10. The jigsaw as described in claim 9, characterized in that, The partition plate below the air duct circulation hole is provided with wind-blocking ribs.