A flow guide control structure and power head, electric tool

Abstract

The application relates to the field of electric tools, and particularly discloses a flow guide control structure, a power head and an electric tool, wherein the flow guide control structure comprises a mounting seat, a shielding piece, a booster arm and a spring; a flow guide opening is arranged on the side surface of the mounting seat; the shielding piece is provided with a through hole matched with the flow guide opening; the shielding piece is slidingly arranged on the inner side surface of the mounting seat and is used for opening or closing the flow guide opening; the booster arm comprises opposite force receiving ends and a connecting end; the booster arm is hingedly arranged in the mounting seat and is connected with the shielding piece through the connecting end; the side surface of the mounting seat is provided with the shielding piece; the side of the shielding piece is provided with the spring; the connecting end of the booster arm is connected with the shielding piece; the force receiving end of the booster arm is connected with the bottom end of the battery pack; the force receiving end can reciprocally move along the inner side surface of the mounting seat according to whether the battery pack is pressed downward, so as to open or close the flow guide opening; the shielding piece on the mounting seat is independently connected with each battery pack and does not affect each other.

Description

Technical Field

[0001] This application relates to the field of power tool technology, specifically to a flow control structure and power head, and a power tool. Background Technology

[0002] As the core driving component of power tools, the cooling management of the internal battery pack in the power head is crucial. Precise control of the airflow direction and on / off state is often required in the battery pack cooling system. For example, in a power head with multiple battery packs, when a battery pack is installed, its corresponding airflow channel needs to be opened for heat exchange; conversely, when the battery pack is removed or not installed, the corresponding airflow channel needs to be closed via a control mechanism to prevent airflow short-circuiting, energy loss, or environmental contaminants from entering the system. Based on an understanding of related technologies, current control mechanisms lack independent linkage when closing airflow channels. Utility Model Content

[0003] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide a flow control structure, a power head, and an electric tool.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A flow control structure, comprising:

[0006] Mounting base, wherein a flow guide port is provided on the side of the mounting base;

[0007] A shielding component, which is slidably mounted on the side of the mounting base, is adapted to control the opening or closing of the flow guide port;

[0008] An assisting arm, which is rotatably mounted in the mounting base via a pivot, the assisting arm including opposing force-receiving ends and connecting ends;

[0009] Wherein, the connecting end faces the shielding member, and when the assisting arm rotates around the pivot, the connecting end can approach and squeeze the shielding member, causing the shielding member to slide on the side of the mounting base, and the sliding shielding member controls the opening or closing of the guide port.

[0010] Furthermore, the mounting base is provided with a first elastic element. One end of the first elastic element abuts against the inner wall of the mounting base, and the other end is connected to the assisting arm. When the force-bearing end is subjected to compressive force, the first elastic element deforms, the assisting arm rotates around the pivot, and the connecting end approaches and presses against the blocking member. When the compressive force disappears, the first elastic element drives the assisting arm to rotate in the opposite direction around the pivot, and the connecting end moves away from the blocking member.

[0011] Furthermore, one of the shielding member and the mounting base is provided with a guide groove, and the other is provided with a guide rail that slides in cooperation with the guide groove. The shielding member can slide on the side of the mounting base through the cooperation of the guide groove and the guide rail.

[0012] Furthermore, the two sides of the mounting base are suitable for mounting battery packs. After the battery packs are installed, they are locked on the mounting base and press against the force-receiving end of the assist arm. The assist arm rotates around the pivot, and the connecting end approaches and presses against the blocking member. The blocking member slides on the side of the mounting base, and the flow guide opens. When the battery pack is separated from the mounting base, the pressure on the force-receiving end disappears, and the blocking member resets under the action of elasticity and closes the flow guide.

[0013] Alternatively, when a battery pack is installed on one side of the mounting base and not on the other side, the assist arm on the side of the battery pack rotates around the pivot, the connecting end approaches and presses against the shield, the shield on the side of the battery pack slides on the side of the mounting base, the flow port opens, the force-bearing end of the assist arm on the side without the battery pack is not subjected to pressure, and the shield on that side remains in the state of closing the flow port.

[0014] Furthermore, a second elastic member is provided on one side of the shielding member. One end of the second elastic member abuts against the inner wall of the mounting base, and the other end abuts against the shielding member. When the second elastic member deforms, it provides the elastic force required for the shielding member to reset.

[0015] Furthermore, the battery pack is provided with an air inlet and an air outlet, the air outlet corresponding to the guide port. When the shielding member opens the guide port, the air outlet is connected to the guide port. When the shielding member closes the guide port, the air outlet is blocked from the guide port.

[0016] Furthermore, the mounting base includes a first mounting base and a second mounting base that are spliced ​​together. The inner side of the first mounting base is provided with a first insertion part, and the inner side of the second mounting base is provided with a second insertion part. When the first mounting base and the second mounting base are spliced ​​together, the first insertion part and the second insertion part are inserted into each other.

[0017] Furthermore, the shielding member has multiple raised ribs on the other side opposite to the flow guide, and the raised ribs are adapted to the shapes of the first insertion part and the second insertion part.

[0018] Furthermore, the inner surfaces of the first and second mounting seats are provided with protrusions arranged along the sliding direction of the shielding member, and the shielding member is provided with grooves that cooperate with the protrusions. When the first and second mounting seats are spliced ​​together, the protrusions engage with the grooves, so that the shielding member fits against the guide port and is confined within the mounting seat while having sliding space.

[0019] Furthermore, the shielding member has multiple limiting ribs on the other side opposite to the guide port, and the multiple limiting ribs form a limiting space, in which the connecting end of the assist arm is accommodated.

[0020] When the connecting end approaches the blocking member, the connecting end applies a squeezing force to the limiting rib, causing the blocking member to slide on the side of the mounting base.

[0021] The advantages of the flow control structure provided in this application compared to the prior art are as follows: 1. Each battery pack installation position in this application is equipped with an independent linkage mechanism consisting of an assist arm, a shield, and an elastic element. When the battery pack is installed and locked, it directly presses the force-bearing end of the corresponding assist arm. This force overcomes the resistance of the first elastic element and drives the assist arm to rotate around the pivot. Its connecting end then approaches and presses the shield corresponding to that position, forcing the shield to slide open the flow port corresponding to the battery pack, thus achieving "installation opens the corresponding channel". When the battery pack is removed, the pressing force applied to the force-bearing end of the assist arm disappears. At this time, the first elastic element automatically resets, driving the assist arm to rotate in the opposite direction, and its connecting end moves away from the shield. At the same time, the second elastic element drives the shield to automatically slide and reset, tightly closing the flow port corresponding to the battery pack, thus achieving "removal closes the corresponding channel".

[0022] 2. In the location where the battery pack is not installed, the air vent is tightly closed by a shield, which blocks the path of the cooling airflow through the empty space and prevents the cooling airflow from leaking unnecessaryly or bypassing the battery pack that needs to be cooled, thus significantly improving the efficiency of the cooling system.

[0023] Another technical solution adopted in this application is to provide a power head, which includes the above-mentioned flow control structure.

[0024] The power head is equipped with the aforementioned flow control structure, and thus possesses the technical effects of the aforementioned flow control structure.

[0025] Another technical solution adopted in this application is to provide an electric tool that includes the aforementioned power head.

[0026] The power tool is equipped with the aforementioned power head, and accordingly possesses the technical effects of the aforementioned flow control structure and power head. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the flow control structure in Embodiment 1 of this application.

[0029] Figure 2 This is a longitudinal cross-sectional schematic diagram of the flow control structure in Embodiment 1 of this application.

[0030] Figure 3 This is an exploded view of the flow control structure of this application.

[0031] Figure 4 This is a schematic diagram of the installation of the shielding member in the mounting base in Embodiment 1 of this application.

[0032] Figure 5 This is a three-dimensional structural diagram of the shielding component in Embodiment 1 of this application.

[0033] Figure 6 This is a schematic diagram of the internal structure of the flow control structure in Embodiment 1 of this application.

[0034] Figure 7 This is a schematic diagram of the structure of the connecting end of the assist arm of this application when it is far away from the obstruction.

[0035] Figure 8 This is a schematic diagram of the structure when the connecting end of the assist arm of this application approaches and presses against the blocking component.

[0036] Figure 9 This is a schematic diagram showing the disassembled structure of the flow control structure in Embodiment 1 of this application.

[0037] Figure 10 This is a side view of the flow control structure with a battery pack installed on one side in Embodiment 1 of this application.

[0038] Figure 11 for Figure 10 A schematic diagram of the AA-direction cross-section structure.

[0039] Figure 12 This is a three-dimensional structural diagram of the first mounting base in Embodiment 1 of this application.

[0040] Figure 13 This is a three-dimensional structural diagram of the second mounting base in Embodiment 1 of this application.

[0041] Figure 14 for Figure 9 A magnified schematic diagram of the structure at point B in the diagram.

[0042] Figure 15 This is a schematic diagram of the power head in Embodiment 2 of this application. Detailed Implementation

[0043] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0044] Reference Figures 1 to 4 A flow control structure 100 is provided for heat dissipation of a device or equipment equipped with a battery pack, for example, for heat dissipation of a power head equipped with a battery pack.

[0045] In this embodiment, the flow control structure 100 includes a mounting base 10, a shielding member 11, an assisting arm 13, and a spring 15 (a second elastic member). Flow guide ports 12 are respectively opened on the opposite sides of the mounting base 10. Battery packs 200 are mounted on both sides of the mounting base 10 (the installed battery packs 200 can be locked onto the mounting base 10). The battery packs 200 have air inlets 201 and air outlets 202. After the battery packs 200 are stably mounted on the mounting base 10, the air outlets 202 on their surfaces interact with the flow guides on the mounting base 10. Corresponding to port 12, a fan-like airflow guide (not shown) is installed in the inner cavity or extended path of the mounting base 10. After the airflow guide is activated, the airflow in the inner cavity of the mounting base 10 flows. External cooling air enters the battery pack 200 through the air inlet 201 and flows into the inner cavity of the mounting base 10 from the air outlet 202 and the airflow guide 12. It then flows to the next area along the airflow path. The flowing cooling air can carry away the heat inside the battery pack 200, thereby dissipating heat from the battery pack 200.

[0046] Reference Figure 5The shielding member 11 is slidably installed on the inner side of the side of the mounting base 10, that is, on the inner side of the side with the flow guide 12. The shielding member 11 can reciprocate relative to the inner side of the mounting base 10. The shielding member 11 has a through hole 112 that cooperates with the flow guide 12. The shielding member 11 is used to control the opening or closing of the flow guide 12 on the corresponding inner side of the mounting base 10. That is, it is achieved by the reciprocating movement of the shielding member 11 relative to the inner side of the mounting base 10. For example, when the through hole 112 on the shielding member 11 coincides with the flow guide 12 on the inner side of the mounting base 10, the flow guide 12 is in the open position. When the through hole on the shielding member 11 does not coincide with the flow guide 12, the flow guide 12 is in the closed position.

[0047] Reference Figure 2 The assist arm 13 is hinged to the mounting base 10 via a pivot 13a, and the assist arm 13 can rotate relative to the mounting base 10. For ease of description, the two opposite ends of the assist arm 13 are referred to as the connecting end 132 and the force-bearing end 131, respectively. The force-bearing end 131 is the end of the assist arm 13 that contacts the bottom of the inserted battery pack, and the connecting end 132 is the end of the assist arm 13 that is close to the shield 11.

[0048] Reference Figures 6 to 11 One end of the spring 15 is fixedly installed in the mounting base 10, and the other end of the spring 15 is in contact with the side of the blocking member 11. The spring 15 is used to push the blocking member 11 to move and reset after being pushed by the connecting end 132 of the assisting arm 13. That is, after the blocking member 11 loses the force applied by the assisting arm 13, the spring 15 is compressed and reset, and then pushes the blocking member 11 to move and reset.

[0049] In this embodiment, the shielding member 11 has two working positions: one is the open position (that is, the through hole 112 on the shielding member 11 coincides with the guide port 12 on the inner side of the mounting base 10), and the other is the closed position (that is, the through hole 112 on the shielding member 11 is misaligned with the guide port 12 on the inner side of the mounting base 10).

[0050] In order to enable the force-receiving end 131 of the assist arm 13 to quickly reset, a reset spring 14 (first elastic element) is installed between the force-receiving end 131 and the end face of the mounting base 10. One end of the reset spring 14 is fixedly connected to the force-receiving end 131, and the other end of the reset spring 14 is fixedly installed on the end face of the mounting base 10.

[0051] When the battery pack 200 is inserted, the battery pack applies a downward force to the force-receiving end 131, causing the force-receiving end 131 to move downward and apply a downward force to the return spring 14, causing the return spring 14 to deform under pressure. When the battery pack is removed, the return spring 14 extends and retracts to return to its original position, pushing the force-receiving end 131 of the assist arm 13 to rotate and return to its original position.

[0052] In this embodiment, the control of the two working positions of the shielding member 11 is achieved by whether or not the battery pack 200 is inserted. When the battery pack 200 is inserted into one side of the mounting base 10, the bottom end of the battery pack 200 will contact the force-receiving end 131 of the assisting arm 13, and the weight of the battery pack 200 will exert a downward force on the force-receiving end 131 of the assisting arm 13, causing the force-receiving end 131 to move downward. Since the assisting arm 13 is rotatably hinged in the mounting base 10, after the force-receiving end 131 rotates downward, the connecting end 132 at the other end will rotate and squeeze the shielding member 11 to move along the inner side of the mounting base 10, so that the through hole 112 on the shielding member 11 coincides with the guide port 12 on the inner side of the mounting base 10, and the through hole 112 and the guide port 12 are connected, realizing the opening of the guide port 12. At this time, the shielding member 11 is in the open position.

[0053] When the battery pack is removed, the force-bearing end 131 of the assist arm 13 loses the pressure from the battery pack and reverses to reset. The connecting end 132 of the assist arm 13 loses the pushing force on the blocking member 11. Under the reset force of the spring 15, the blocking member 11 is pushed by the spring 15 to move in the opposite direction along the inner side of the mounting base 10 to reset. The through hole 112 on the blocking member 11 is misaligned with the guide port 12 on the inner side of the mounting base 10 on that side. The guide port 12 is in a closed state, and the external cold air entering the inner cavity of the mounting base 10 cannot flow out through the guide port 12 on the inner side of that side. At this time, the blocking member 11 is in a closed state. Similarly, it can be understood that when no battery pack is placed on one side of the mounting base 10, the blocking member 11 is in a closed state.

[0054] Additionally, when a battery pack 200 is installed on one side of the mounting base 10 and not on the other side, the assist arm 13 on the battery pack side rotates around the pivot 13a, and the connecting end 132 approaches and presses against the blocking member 11. The blocking member 11 on the battery pack 200 side slides on the side of the mounting base 10, and the flow port 12 opens. The force-bearing end 131 of the assist arm 13 on the side without the battery pack installed is not subjected to pressure, and the blocking member 11 on that side remains in the state of closing the flow port 12. The advantage of this design is that each battery pack 200 has an independent assist arm 13 and blocking member 11. 1. After the flow guide drive is activated, the airflow in the inner cavity of the mounting base 10 flows. The external cooling air enters the battery pack 200 through the air inlet 201 and flows into the inner cavity of the mounting base 10 from the air outlet 202 and the flow guide 12. The flowing airflow dissipates heat from the installed battery pack 200. In the position where the battery pack is not installed, the flow guide 12 is tightly closed by the shield 11. This blocks the path of "short circuit" of the cooling airflow through the empty space, avoiding unnecessary leakage of cooling airflow from this place or bypassing the battery pack that needs to be cooled, and significantly improving the efficiency of the cooling system.

[0055] Specifically, refer to Figure 7 , Figure 8 The shield 11 has multiple limiting ribs 115 on the middle of the side opposite to the guide port 12. The multiple limiting ribs 115 form a limiting space 116. The connecting end 132 of the assist arm 13 can be accommodated in the limiting space 116. One side of the limiting rib 115 has a first inclined surface 115a, and the side of the connecting end 132 has a second inclined surface 132a. When the battery pack 200 is inserted into one side of the mounting base 10, the connecting end 132 will rotate and enter the limiting space 116. During this process, the second inclined surface 132a of the connecting end 132... 2a will squeeze the first inclined surface 115a of the limiting rib 115. The mutual squeezing between the two inclined surfaces allows the connecting end 132 to push the blocking member 11 to move on its sliding path, thereby opening the guide port 12. When the battery pack 200 is unlocked and pulled out from the mounting base 10, the reset spring 14 drives the assist arm 13 to rotate in the opposite direction to reset. At this time, the connecting end 132 moves away from the blocking member 11 and disengages from the limiting space 116. The squeezing force on the blocking member 11 disappears, the spring 15 drives the blocking member 11 to reset, and the blocking member 11 closes the guide port 12.

[0056] It should be noted that when the battery pack 200 is not installed on one side of the mounting base 10, the assist arm 13 on that side will not be subjected to force and will not rotate. In this case, the connecting end 132 of the assist arm 13 is in a state away from the shield 11, and the connecting end 132 will not enter the limiting space 116 of the shield 11 on that side.

[0057] Reference Figure 5 , Figure 9 , Figure 14 A fixing part 117 is provided on one side of the shielding member 11, and the other end of the spring 15 is fixedly connected to the fixing part 117. The fixing part 117 facilitates the fixed installation of the spring on the shielding member 11. The mounting base 10 has a receiving part 16, and the spring 15 is installed in the receiving part 16.

[0058] Reference Figure 3 , Figure 7 and Figure 8 As shown, the mounting base 10 includes a first mounting base 101 and a second mounting base 102, which are assembled together. By adopting a split assembly structure for the mounting base, it is convenient to install the shielding member 11 on the inner side of the mounting base.

[0059] Reference Figures 5 to 8As shown, specifically, the first mounting base 101 is provided with a first insertion part 1011, and the second mounting base 102 is provided with a second insertion part 1021 corresponding to the first insertion part 1011. The second insertion part 1021 is inserted into the first insertion part 1011. Through the insertion and cooperation of the second insertion part 1021 and the first insertion part 1011, the splicing of the first mounting base 101 and the second mounting base 102 can be realized.

[0060] Reference Figure 3 , Figure 12 and Figure 13 The shielding member 11 has multiple raised ribs 113 on the side opposite to the guide port 12. The raised ribs 113 are shaped to accommodate the first insertion part 1011 and the second insertion part 1021. The raised ribs 113 and the first insertion part 1011 and the second insertion part 1021 form a sliding connection along the sliding direction of the shielding member 11. In this embodiment, the first insertion part 1011 and the second insertion part 1021 are cylindrical, and the raised ribs 113 are correspondingly formed as arc-shaped grooves. In this way, when the shielding member 11 is installed on the inner side of the mounting base, the raised ribs 113 match the shapes of the first insertion part 1011 and the second insertion part 1021, and the two will not interfere with each other, so as not to affect the movement of the shielding member 11.

[0061] Reference Figure 2 and Figure 4 As shown, a guide groove 111 is provided on one side of the shielding member 11, and a guide rail that cooperates with the guide groove 111 is provided on the inner side of the mounting base. The direction of the guide rail and the guide groove is parallel to the sliding direction of the shielding member 11. The arrangement of the guide groove 111 and the guide rail facilitates the shielding member 11 to slide smoothly along the inner side of the mounting base.

[0062] Reference Figure 3 , Figure 4 , Figure 12 , Figure 13 The inner side of the mounting base is provided with protrusions 17 arranged along the sliding direction of the shielding member on opposite sides. The two sides of the shielding member 11 are provided with grooves 114 that slide with the protrusions 17. The grooves 114 cooperate with the protrusions 17 on the two bases, thereby limiting the shielding member 11 within the mounting base 10 through the first insertion part 1011, the second insertion part 1021, the grooves 114 and the protrusions 17, so that the shielding member 11 is tightly fitted with the guide port 12, and the shielding member 11 also has room to slide.

[0063] Example 2

[0064] Reference Figure 15This embodiment demonstrates a power head 300, which includes the flow control structure 100 described in the above embodiment. The power head 300 also has a motor 310. The battery pack 200 installed on the flow control structure 100 supplies power to the motor 310, providing power for the operation of the motor 310. After the flow control structure 100 is installed on the power head 300, the flow port in the position where the battery pack is not installed is tightly closed by the shielding component. This blocks the path of "short circuit" of the cooling airflow through the empty space, avoiding unnecessary leakage of cooling airflow or bypassing the battery pack that needs to be cooled, and significantly improving the efficiency of the entire cooling system on the power head 300.

[0065] Example 3

[0066] This embodiment demonstrates a power tool equipped with the power head 300 described above. The motor 310 of the power head 300 is mechanically connected to the tool head of the power tool. The power tool can be specifically implemented as a lawnmower, snowplow, blower, etc. During operation, the power head 300 has a good cooling effect.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A flow guidance control structure, characterized in that, include: Mounting base, wherein a flow guide port is provided on the side of the mounting base; A shielding component, which is slidably mounted on the side of the mounting base, is adapted to control the opening or closing of the flow guide port; An assisting arm, which is rotatably mounted in the mounting base via a pivot, the assisting arm including opposing force-receiving ends and connecting ends; Wherein, the connecting end faces the shielding member, and when the assisting arm rotates around the pivot, the connecting end can approach and squeeze the shielding member, causing the shielding member to slide on the side of the mounting base, and the sliding shielding member controls the opening or closing of the guide port.

2. The flow control structure of claim 1, wherein, The mounting base is provided with a first elastic element. One end of the first elastic element abuts against the inner wall of the mounting base, and the other end is connected to the assisting arm. When the force-bearing end is subjected to compressive force, the first elastic element deforms, the assisting arm rotates around the pivot, and the connecting end approaches and presses against the blocking member. When the compressive force disappears, the first elastic element drives the assisting arm to rotate in the opposite direction around the pivot, and the connecting end moves away from the blocking member.

3. The flow control structure according to claim 1, characterized in that, One of the shielding member and the mounting base is provided with a guide groove, and the other is provided with a guide rail that slides in cooperation with the guide groove. The shielding member can slide on the side of the mounting base through the cooperation of the guide groove and the guide rail.

4. The flow control structure of claim 2, wherein, The two sides of the mounting base are suitable for mounting battery packs. After the battery packs are installed, they are locked on the mounting base and press the force-receiving end of the assist arm. The assist arm rotates around the pivot. The connecting end approaches and presses the shield. The shield slides on the side of the mounting base. The flow guide opens. When the battery pack is separated from the mounting base, the pressure on the force-receiving end disappears. The shield resets under the action of elasticity and closes the flow guide. Alternatively, when a battery pack is installed on one side of the mounting base and not on the other side, the assist arm on the side of the battery pack rotates around the pivot, the connecting end approaches and presses against the shield, the shield on the side of the battery pack slides on the side of the mounting base, the flow port opens, the force-bearing end of the assist arm on the side without the battery pack is not subjected to pressure, and the shield on that side remains in the state of closing the flow port.

5. The flow control structure of claim 4, wherein, A second elastic element is provided on one side of the shielding member. One end of the second elastic element abuts against the inner wall of the mounting base, and the other end abuts against the shielding member. When the second elastic element deforms, it provides the elastic force required for the shielding member to reset.

6. The flow control structure of claim 4, wherein, The battery pack is provided with an air inlet and an air outlet. The air outlet corresponds to the air guide. When the shield opens the air guide, the air outlet is connected to the air guide. When the shield closes the air guide, the air outlet is blocked from the air guide.

7. The flow control structure of claim 1, wherein, The mounting base includes a first mounting base and a second mounting base that are spliced ​​together. The first mounting base has a first insertion part on its inner side, and the second mounting base has a second insertion part on its inner side. When the first mounting base and the second mounting base are spliced ​​together, the first insertion part and the second insertion part are inserted into each other.

8. The flow control structure of claim 7, wherein, The shielding member has multiple raised ribs on the side opposite to the flow guide, and the raised ribs are adapted to the shapes of the first insertion part and the second insertion part.

9. The flow control structure of claim 7, wherein, The first and second mounting bases have protrusions arranged along the sliding direction of the shielding member on their inner surfaces. The shielding member has grooves that mate with the protrusions. When the first and second mounting bases are joined together, the protrusions engage with the grooves, so that the shielding member fits against the guide port and is confined within the mounting base while having sliding space.

10. The flow control structure of claim 1, wherein, The shielding member has multiple limiting ribs on the other side opposite to the guide port. The multiple limiting ribs form a limiting space, and the connecting end of the assist arm is accommodated in the limiting space. When the connecting end approaches the blocking member, the connecting end applies a squeezing force to the limiting rib, causing the blocking member to slide on the side of the mounting base.

11. A powerhead characterized by, Includes the flow control structure according to any one of claims 1-10.

12. An electric power tool characterized by comprising: Includes the power head as described in claim 11.

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