A power head and power tool

Abstract

The application relates to the field of electric tools, and particularly discloses a power head and an electric tool, wherein the power head comprises a shell, a mounting seat, battery packs which can be inserted and locked on both sides of the mounting seat, a first controller and a second controller arranged in the shell, a driving assembly arranged in an assembly cavity in the shell, one side surface of the battery pack is provided with an air inlet, the other side surface is provided with an air outlet, a first heat dissipation channel is arranged in the mounting seat, a second heat dissipation channel which is in communication with the first heat dissipation channel is arranged in the shell, and a third heat dissipation channel is formed between the inner wall of the assembly cavity and the outer wall of the driving assembly. The continuous through path of the air inlet, the first heat dissipation channel, the second heat dissipation channel and the third heat dissipation channel enables cooling air to flow through the battery pack, the first controller, the second controller and the surface of the driving assembly in sequence, realizes series heat dissipation of the three heat sources of the battery pack, the controller and the motor, and significantly reduces the overall temperature rise of the system.

Description

Technical Field

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

[0002] As power tools evolve towards higher power and compact designs, the heat dissipation requirements for their internal electronic components (such as controllers, battery packs, and drive motors) are becoming increasingly stringent. Especially in core components like the power head, the main control chip, drive chip, and motor drive assembly generate significant heat during operation. Insufficient heat dissipation will lead to performance degradation, shortened lifespan, or even failure of these components. Meanwhile, to improve tool endurance, removable high-capacity battery packs are widely used, but the battery packs themselves also require efficient heat dissipation during charging and discharging.

[0003] Based on an understanding of the relevant technologies, it is clear that power tool cooling systems, through a single DC cooling path, cannot efficiently cool multiple heat sources within the limited space of the power head. Utility Model Content

[0004] The purpose of at least one specific embodiment of this utility model is to overcome the defects of the existing technology and provide a power head and power tool.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A power head, comprising:

[0007] case;

[0008] A mounting base is provided on the housing;

[0009] A battery pack having an air inlet and being detachably mounted on the mounting base;

[0010] The first controller and the second controller are both housed within the housing.

[0011] A drive assembly is disposed within the assembly cavity of the housing;

[0012] The mounting base is provided with a first heat dissipation channel, and the housing is provided with a second heat dissipation channel that communicates with the first heat dissipation channel.

[0013] A third heat dissipation channel is formed between the inner wall of the assembly cavity and the outer wall of the drive assembly, surrounding the drive assembly.

[0014] The air inlet, the first heat dissipation channel, the second heat dissipation channel, and the third heat dissipation channel form a conductive heat dissipation path;

[0015] A flow guide drive is installed on the heat dissipation path. The flow guide drive is configured to drive the cooling airflow to enter from the air inlet when started, and then flow along the heat dissipation path to successively pass over the surfaces of the first controller and the second controller for heat dissipation. Afterward, it flows through the third heat dissipation channel and passes over the surface of the drive component for heat dissipation before being discharged.

[0016] Furthermore, the housing has a first encapsulation cavity and a second encapsulation cavity, the first controller is disposed in the first encapsulation cavity, the second controller is disposed in the second encapsulation cavity, the first encapsulation cavity has a first inlet and a first outlet, and the second encapsulation cavity has a second outlet;

[0017] Wherein, the first inlet is connected to the second heat dissipation channel, the first outlet maintains the connection between the first encapsulated cavity and the second encapsulated cavity, and the second outlet is connected to the third heat dissipation channel;

[0018] On the heat dissipation path, when the external cooling airflow flows through the first heat dissipation channel and the second heat dissipation channel, a first direct current heat dissipation path is formed. After the cooling airflow enters the first enclosed cavity, a first vortex heat dissipation path is formed. After the cooling airflow enters the second enclosed cavity, a second vortex heat dissipation path is formed. When the cooling airflow enters the third heat dissipation channel, a second direct current heat dissipation path is formed.

[0019] In the first vortex heat dissipation path, the cooling airflow fills the first encapsulated cavity; in the second vortex heat dissipation path, the cooling airflow exits from the first encapsulated cavity and fills the second encapsulated cavity.

[0020] Furthermore, the mounting surfaces of the first controller and the second controller are located on different planes, the first enclosure cavity is located in the peripheral region of one surface of the housing, the second enclosure cavity is located in the peripheral region of another surface of the housing, and the assembly cavity is located in the internal region of the housing;

[0021] When the cooling airflow flows along the heat dissipation path, the cooling airflow flows through the inside of the battery pack, enters the inner cavity of the mounting base, surrounds at least two outer surfaces of the housing, and then enters the assembly cavity.

[0022] Furthermore, the mounting base is equipped with a flow guide port, which is connected to the first heat dissipation channel;

[0023] The battery pack is provided with an air outlet corresponding to the air guide port, and the mounting base is provided with an air guide control structure suitable for controlling the opening or closing of the air guide port.

[0024] Furthermore, the flow control structure includes:

[0025] 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;

[0026] 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;

[0027] 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.

[0028] 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.

[0029] 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.

[0030] Furthermore, the two sides of the mounting base are adapted to mount the battery pack. After the battery pack is installed, it is locked on the mounting base and presses 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 port opens, and the heat dissipation path of the battery pack is connected.

[0031] When the battery pack is separated from the mounting base, the compressive force on the force-bearing end disappears, the shielding member resets under the action of elasticity and closes the flow port, and the heat dissipation path of the battery pack is closed.

[0032] 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 battery pack side rotates around the pivot, the connecting end approaches and presses against the shield, the shield on the battery pack side slides on the side of the mounting base, the flow port opens, the heat dissipation path on the side where the battery pack is installed is open, and the shield on the side where the battery pack is not installed remains closed, thus closing the heat dissipation path on the side where the battery pack is not installed.

[0033] 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.

[0034] 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.

[0035] Furthermore, the drive assembly includes a motor installed in the assembly cavity, and a flow guide drive connected to the motor shaft of the motor, the flow guide drive being disposed in the assembly cavity on the side near the second covering cavity.

[0036] Furthermore, the housing is provided with a support frame, which is supported at the bottom of the mounting base. The support frame is provided with ventilation holes, which keep the first heat dissipation channel and the second heat dissipation channel connected.

[0037] Furthermore, a cover is installed on the top of the housing, and a flip cover is rotatably connected to one side of the cover. The flip cover covers the outside of the battery pack. After the flow guide drive is activated, the external cooling airflow flows from the gap between the flip cover and the cover to the air inlet of the battery pack.

[0038] The advantages of the power head provided in this application compared with the prior art are as follows: 1. This application uses a continuous through-path of air inlet, first heat dissipation channel, second heat dissipation channel and third heat dissipation channel to make the cooling airflow flow through the surface of battery pack, first controller, second controller and drive component in sequence, so as to realize the series heat dissipation of the three major heat sources of "battery pack-controller-motor" and significantly reduce the overall temperature rise of the system.

[0039] 2. This application adopts a DC + eddy current composite heat dissipation mode. The first heat dissipation channel and the second heat dissipation channel form a first DC path to quickly guide the airflow to the first controller. A first eddy current path is formed in the first enclosing cavity, so that the airflow fills the cavity and surrounds the surface of the first controller, extending the heat exchange time. A second eddy current path is formed in the second enclosing cavity to enhance the heat dissipation uniformity of the second controller. The third heat dissipation channel forms a second DC path to force the airflow to sweep across the motor housing, solving the heat dissipation problem of the assembly cavity.

[0040] 3. This application utilizes the outer periphery of the housing surface to arrange the encapsulation cavity (first / second controller) and the inner area to arrange the assembly cavity, thereby realizing a three-dimensional layered heat dissipation layout. The cooling airflow flows around the housing surface, passing through the first and second encapsulation cavities in sequence to form a "surface circulation". The airflow enters the inner assembly cavity from the outer layer through the second outlet, forming an "axial direct current" along the outer wall of the motor. The surface circulation path is short and the wind resistance is low, and the airflow sweeps across the controller surface at high speed. The core layer has a long direct current path and high wind pressure, forcibly penetrating the dense heat dissipation area of ​​the motor. The layered flow velocity differential design adapts to the heat dissipation needs of different heat sources.

[0041] Moreover, the encapsulation cavity directly utilizes the side wall of the housing as the cavity boundary (without adding an extra chamber), saving space while enhancing the rigidity of the housing structure. The assembly cavity naturally forms a third heat dissipation channel through the gap between the inner wall and the outer wall of the motor, without the need to increase the thickness of the air duct.

[0042] 4. The first controller and the second controller of this application are respectively arranged in the peripheral areas of different surfaces of the shell, "borrowing the shell to create a cavity" to achieve zero volume redundancy of the power head.

[0043] 5. Each battery pack installation location in this application is equipped with an independent flow control structure consisting of an assist arm, a shield, and an elastic element, which realizes "opening the corresponding channel upon battery pack installation"; when the battery pack is removed, the shield tightly closes the flow port corresponding to the battery pack, realizing "closing the corresponding channel upon removal". In the position where no battery pack is installed, its flow port is tightly closed by the shield, which blocks the path of "short circuit" of the cooling airflow through the empty space, avoids unnecessary leakage of cooling airflow from this point or bypassing the battery pack that needs to be cooled, and significantly improves the efficiency of the cooling system.

[0044] Another technical solution adopted in this application is: to provide an electric tool, which includes the above-mentioned power head and has the technical effects of the above-mentioned power head. Attached Figure Description

[0045] 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.

[0046] Figure 1 This is a schematic diagram of the power head in Embodiment 1 of this application.

[0047] Figure 2 This is a schematic diagram of the power head from another angle in Embodiment 1 of this application.

[0048] Figure 3 This is a schematic diagram of the structure of the power head after the flip cover is removed in Embodiment 1 of this application.

[0049] Figure 4 This is a schematic diagram of the assembly of the power head in Embodiment 1 of this application.

[0050] Figure 5 This is a top view of the power head in Embodiment 1 of this application.

[0051] Figure 6 for Figure 5 A schematic diagram of the cross section along line AA.

[0052] Figure 7 for Figure 5 A schematic diagram of the cross section along line BB.

[0053] Figure 8 This is a schematic diagram of the assembly of the housing and the mounting base in Embodiment 1 of the application.

[0054] Figure 9 for Figure 8 Another structural diagram from another angle.

[0055] Figure 10 This is a schematic diagram of the battery pack installation on the mounting bracket.

[0056] Figure 11 for Figure 10 A schematic diagram of the longitudinal section.

[0057] Figure 12 This is a schematic diagram of the assembly of the battery pack and mounting base.

[0058] Figure 13 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.

[0059] Figure 14 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.

[0060] Figure 15 This is a schematic diagram of the internal structure of the mounting base in Embodiment 1 of this application.

[0061] Figure 16 This is a schematic diagram of the structure of the first mounting base in Embodiment 1 of this application.

[0062] Figure 17 This is a schematic diagram of the structure of the second mounting base in Embodiment 1 of this application. Detailed Implementation

[0063] 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.

[0064] Example 1

[0065] Reference Figures 1 to 4 , Figure 8 , Figure 9 , Figure 12 A power head 100 includes a housing 10, a support frame 20 disposed within the housing 10, a mounting base 30 mounted on the support frame 20, a battery pack 40 that can be inserted into and locked to both sides of the mounting base 30, a first controller 50 and a second controller 60 disposed within the housing 10, and a drive assembly 80 disposed in an assembly cavity 70 inside the housing 10. The battery pack 40 has an air inlet 401 on one side and an air outlet 402 on the other side. In addition, a cover 90 is mounted on the top of the housing 10, and a flip cover 110 is rotatably connected to one side of the cover 90. The cover 90 and the flip cover 110 cover the outside of the mounting base 30 and the battery pack 40. When airflow occurs, external airflow can flow through the gap between the cover 90 and the flip cover 110 to the air inlet 401 of the battery pack 40.

[0066] Furthermore, refer to Figures 5 to 7 The mounting base 30 has an internal cavity, which is configured as the first heat dissipation channel 100a of the power head heat dissipation system. The side of the mounting base 30 is provided with a guide port 301 corresponding to the air outlet 402. When the guide port 301 is connected to the air outlet 402, the internal cavity of the battery pack 40 can be kept connected to the first heat dissipation channel 100a.

[0067] The housing 10 has a second heat dissipation channel 100b that communicates with the first heat dissipation channel 100a. The support frame 20 has a ventilation hole 2001. The ventilation hole 2001 keeps the first heat dissipation channel 100a and the second heat dissipation channel 100b connected. One end of the second heat dissipation channel 100b faces the first controller 50.

[0068] A third heat dissipation channel 100c is formed in the area between the inner wall of the assembly cavity 70 and the outer wall of the drive assembly 80;

[0069] The third heat dissipation channel 100c is connected to the second heat dissipation channel 100b, and the second controller 60 is located at one end of the third heat dissipation channel 100c.

[0070] Reference Figure 4 , Figure 6 , Figure 7The air inlet 401, the first heat dissipation channel 100a, the second heat dissipation channel 100b, and the third heat dissipation channel 100c form a conductive heat dissipation path. A flow guide drive 801 is installed on the heat dissipation path. In this embodiment, the flow guide drive 801 can be specifically implemented as a fan. When the flow guide drive 801 is actually installed, it can be constructed as part of the drive assembly 80. In this embodiment, the drive assembly 80 includes a motor 802 installed in the assembly cavity 70, and the flow guide drive 801 connected to the motor shaft of the motor 802. The motor 802 requires... The electrical energy is provided by the battery pack 40. After the motor 802 starts, it synchronously drives the flow guide drive 801 to start. After the flow guide drive 801 starts, the external cooling airflow enters the battery pack 40 through the air inlet 401, then flows into the first heat dissipation channel 100a and the second heat dissipation channel 100b, and after passing the first controller 50 and the second controller 60, it enters the third heat dissipation channel 100c and passes over the surface of the motor 802 before being discharged. This realizes the series heat dissipation of the three major heat sources of "battery pack-controller-motor", which significantly reduces the overall temperature rise of the system.

[0071] In this embodiment, the housing 10 has a first covering cavity 101 and a second covering cavity 102. The area of ​​the first covering cavity 101 that is directly visible on the housing 10 is 101c, and the area of ​​the second covering cavity 102 that is directly visible on the housing 10 is 102c. A first controller 50 is disposed in the first covering cavity 101, and a second controller 60 is disposed in the second covering cavity 102. The first covering cavity 101 has a first inlet 101a and a first outlet 101b, and the second covering cavity 102 has a second outlet 102a.

[0072] The first inlet 101a is connected to the second heat dissipation channel 100b, the first outlet 101b maintains the connection between the first encapsulation cavity 101 and the second encapsulation cavity 102, and the second outlet 102a is connected to the third heat dissipation channel 100c.

[0073] In the heat dissipation path, when the external cooling airflow flows through the first heat dissipation channel 100a and the second heat dissipation channel 100b, it forms the first direct current heat dissipation path. After the cooling airflow enters the first enclosing cavity 101, it forms the first vortex heat dissipation path. The surface of the first controller 50 is equipped with heat sink 50a. After the cooling airflow flows fully in the first enclosing cavity 101, it flows along the heat sink 50a and enters the second enclosing cavity 102 through the first outlet 101b, forming the second vortex heat dissipation path. After the cooling airflow comes into full contact with the second controller 60, it enters the third heat dissipation channel 100c through the second outlet 102a, forming the second direct current heat dissipation path.

[0074] In the first vortex heat dissipation path, the cooling airflow fills the first enclosing cavity 101, forming a first vortex path within the first enclosing cavity 101. The cooling airflow can fully contact the peripheral surface and the surface of the first controller 50, extending the heat exchange time. In the second vortex heat dissipation path, the cooling airflow is led out from the first enclosing cavity 101 and fills the second enclosing cavity 102, forming a second vortex path within the second enclosing cavity 102, enhancing the heat dissipation uniformity of the second controller 60.

[0075] This application adopts a DC + eddy current composite heat dissipation mode. The first heat dissipation channel 100a and the second heat dissipation channel 100b form a first DC path to quickly guide the airflow to the first controller 50. A first eddy current path is formed in the first enclosing cavity 101 so that the airflow fills the cavity and surrounds the surface of the first controller 50, thus prolonging the heat exchange time. A second eddy current path is formed in the second enclosing cavity 102 to enhance the heat dissipation uniformity of the second controller. The third heat dissipation channel 100c forms a second DC path to force the airflow to sweep across the housing of the motor 802, thus solving the heat dissipation problem of the assembly cavity 70.

[0076] In this embodiment, the mounting surface of the first controller 50 and the mounting surface of the second controller 60 are located on different planes, the first covering cavity 101 is located in the outer periphery of one surface of the housing 10, the second covering cavity 102 is located in the outer periphery of another surface of the housing 10, and the assembly cavity 70 is located in the inner region of the housing 10.

[0077] Therefore, after the flow guide drive 801 is activated, the external cooling airflow enters the battery pack 40 through the air inlet 401, passes through the air outlet 402 and the flow guide 301 and enters the first heat dissipation channel 100a. When the cooling airflow flows on the heat dissipation path, the cooling airflow flows through the battery pack 40, enters the inner cavity of the mounting base 30, surrounds the outer periphery of at least two surfaces of the housing 10 and then enters the assembly cavity 70.

[0078] This application utilizes the outer periphery of the housing 10 surface to arrange covering cavities (first / second covering cavities) and the inner region to arrange assembly cavities to achieve a three-dimensional layered heat dissipation layout. The cooling airflow flows around the surface of the housing 10, passing through the first covering cavity 101 and the second covering cavity 102 in sequence, forming a "surface circulation". The airflow enters the inner assembly cavity 70 from the outer layer through the second outlet 102a, forming an "axial direct current" along the outer wall of the motor. The surface circulation path is short and the wind resistance is low, and the airflow sweeps across the controller surface at high speed. The core layer has a long direct current path and high wind pressure, forcibly penetrating the dense heat dissipation area of ​​the motor. The layered flow velocity differential design adapts to the heat dissipation needs of different heat sources.

[0079] Moreover, the first enclosing cavity 101 and the second enclosing cavity 102 directly utilize the side wall of the housing 10 as the cavity boundary (without adding additional cavities), saving space while enhancing the structural rigidity of the housing 10. The assembly cavity 70 naturally forms the third heat dissipation channel 100c through the gap between the inner wall and the outer wall of the motor 802, without the need to increase the thickness of the air duct.

[0080] The first controller 50 and the second controller 60 of this application are respectively arranged in the peripheral areas of different surfaces of the housing 10, "borrowing the housing to create a cavity" to achieve zero volume redundancy of the power head.

[0081] Reference Figures 10 to 12 Since multiple battery packs 40 can be installed on the mounting base 30, after the cooling system inside the power head 100 is started, the cooling airflow will pass through the battery packs 40 and enter the inner cavity of the mounting base 30 through the guide port 301. In order to control the airflow of the guide port 301, the mounting base 30 is provided with a guide control structure 200 suitable for controlling the opening or closing of the guide port 301.

[0082] Furthermore, refer to Figure 13 , Figure 14 , Figure 15 The flow control structure 200 includes:

[0083] The shield 201 is slidably mounted on the inner side of the mounting base 30. After sliding, the shield 201 can control the air guide 301 to open or close relative to the air outlet 402 of the battery pack 40.

[0084] The assist arm 202 is rotatably mounted in the mounting base 30 via a pivot 203. The assist arm 202 includes a force-receiving end 202a and a connecting end 202b.

[0085] When the connecting end 202b faces the blocking member 201, and the assisting arm 202 rotates around the pivot 203, the connecting end 202b can approach and squeeze the blocking member 201, so that the blocking member 201 slides on the side of the mounting base 30, and the sliding blocking member controls the opening or closing of the guide port 301.

[0086] Furthermore, the mounting base 30 is provided with a first elastic element 204. One end of the first elastic element 204 abuts against the inner wall of the mounting base 30, and the other end is connected to the assisting arm 202. After the battery pack 40 is installed and locked on the mounting base 30, the force-bearing end 202a is subjected to compressive force, the first elastic element 204 deforms, the assisting arm 202 rotates around the pivot 203, and the connecting end 202b approaches and presses against the blocking member 201. The blocking member 201 slides on the side of the mounting base 30, the guide port 301 opens, and the heat dissipation path of the battery pack 40 is connected. When the battery pack is separated from the mounting base, the compressive force disappears, the first elastic element 204 drives the assisting arm 202 to rotate in the opposite direction around the pivot 203, the connecting end 202b moves away from the blocking member 201, and the blocking member 201 resets under the action of elasticity and closes the guide port, thus closing the heat dissipation path of the battery pack 40.

[0087] Alternatively, when the battery pack 40 is installed on one side of the mounting base 30 and not on the other side, the assist arm 202 on the side of the battery pack 40 rotates around the pivot 203, the connecting end 202b approaches and presses against the shield 201, the shield 201 on the side of the battery pack 40 slides on the side of the mounting base 30, the guide port 301 opens, the heat dissipation path on the side where the battery pack is installed is open, the shield 201 on the side where the battery pack is not installed keeps the guide port 301 closed, the heat dissipation path on the side where the battery pack is not installed is closed, and the guide port 301 on the side of the mounting base 30 where the battery pack is not installed will not introduce airflow into its inner cavity.

[0088] To improve the stability of the sliding of the shield 201, one of the shield 201 and the mounting base 30 is provided with a guide groove 205, and the other is provided with a guide rail 302 that slides in cooperation with the guide groove 205. The shield 201 can slide on the side of the mounting base 30 through the cooperation of the guide groove 205 and the guide rail 302.

[0089] In addition, in order to ensure that the shielding member 201 can close the guide port 301 with a small sliding displacement, the shielding member 201 is provided with a plurality of mutually spaced through holes 2010, and a blocking part 2011 is formed between adjacent through holes 2010. When the shielding member 201 is in the initial state, the blocking part 2011 corresponds to the guide port 301 and covers one side of the guide port 301, and the guide port 301 is closed at this time. When the shielding member 201 slides under the linkage of the assisting arm 202, the through holes 2010 on the shielding member 201 correspond to the guide port 301, and the guide port 301 is opened at this time.

[0090] Furthermore, a second elastic member 206 is provided on one side of the blocking member 201. One end of the second elastic member 206 abuts against the inner wall of the mounting base 30, and the other end abuts against the blocking member 201. When the second elastic member 206 deforms, it provides the elastic force required for the blocking member 201 to return to its original position after sliding. In this embodiment, both the first elastic member 204 and the second elastic member 206 are preferably springs.

[0091] Furthermore, refer to Figure 16 , Figure 17 The mounting base 30 includes a first mounting base 30a and a second mounting base 30b that are spliced ​​together. The inner side of the first mounting base 30a is provided with a first insertion part 30c, and the inner side of the second mounting base 30b is provided with a second insertion part 30d. When the first mounting base 30a and the second mounting base 30b are spliced ​​together, the first insertion part 30c and the second insertion part 30d are inserted into each other.

[0092] In addition, the inner surfaces of the first mounting base 30a and the second mounting base 30b are provided with protrusions 30e arranged along the sliding direction of the shield 201, and the shield 201 is provided with grooves 201a that cooperate with the protrusions 30e. When the first mounting base 30a and the second mounting base 30b are spliced ​​together, the protrusions 30e and the grooves 201a engage, so that the shield 201 fits against the guide port 301 and is confined within the mounting base 30 while having sliding space.

[0093] Furthermore, the shield 201 has multiple limiting ribs 201b on the opposite side of the guide port 301, forming a limiting space 201c. The connecting end 202b of the assist arm 202 is accommodated within the limiting space 201c. One side of the limiting rib 201b has a first inclined surface 201d, and the side of the connecting end 202b has a second inclined surface 202c. When the battery pack 40 is inserted into one side of the mounting base 30, the connecting end 202b will rotate and enter the limiting space 201c. During this process, the second inclined surface 202c of the connecting end 202b will... The first inclined surface 201d of the compression limiting rib 201b and the mutual compression between the two inclined surfaces enable the connecting end 202b to push the blocking member 201 to move on its sliding path, thereby opening the guide port 301. When the battery pack 40 is unlocked and pulled out from the mounting base 30, the first elastic member 204 drives the assist arm 202 to rotate in the opposite direction to reset. At this time, the connecting end 202b moves away from the blocking member 201 and disengages from the limiting space 201c. The compressive force on the blocking member 201 disappears, and the second elastic member 206 drives the blocking member 201 to reset, and the blocking member 201 closes the guide port 301.

[0094] The flow control structure 200 of this application is configured such that each installation position of the battery pack 40 is equipped with an independent linkage mechanism consisting of an assisting arm 202, a shield 201, and an elastic element. When the battery pack 40 is installed and locked, it directly presses the force-bearing end 202a of the corresponding position of the assisting arm 202. This force overcomes the resistance of the first elastic element 204 and drives the assisting arm 202 to rotate around the pivot 203. Its connecting end 202b then approaches and presses the shield 201 corresponding to that position, forcing the shield 201 to slide open the flow port 301 corresponding to the battery pack, thus realizing "installation opens the corresponding channel". When the battery pack 40 is removed, the pressing force applied to the force-bearing end 202a of the assisting arm 202 disappears. At this time, the first elastic element 204 automatically resets, causing the assist arm 202 to rotate in the opposite direction, and its connecting end 202b moves away from the blocking element 201. At the same time, the second elastic element 206 drives the blocking element 201 to automatically slide and reset, tightly closing the guide port 301 corresponding to the battery pack 40, thus realizing "removal closes the corresponding channel".

[0095] In the position on the mounting base 30 where the battery pack is not installed, the airflow inlet 301 is tightly closed by the shield 201. After the cooling system of the power head 100 is started, this blocks the path of the cooling airflow to "short-circuit" 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.

[0096] Example 2

[0097] This embodiment demonstrates a power tool, which is equipped with the power head 100 of the above embodiment. The motor 802 of the power head 100 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 the operation of the power tool, the controller and motor inside the power head 100 have good heat dissipation and cooling effects.

[0098] 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 power head, characterized in that, include: case; A mounting base is disposed on the housing; A battery pack having an air inlet and being detachably mounted on the mounting base; The first controller and the second controller are both housed within the casing. A drive assembly is disposed within the assembly cavity of the housing; The mounting base is provided with a first heat dissipation channel, and the housing is provided with a second heat dissipation channel that communicates with the first heat dissipation channel. A third heat dissipation channel is formed between the inner wall of the assembly cavity and the outer wall of the drive assembly, surrounding the drive assembly. The air inlet, the first heat dissipation channel, the second heat dissipation channel, and the third heat dissipation channel form a conductive heat dissipation path; A flow guide drive is installed on the heat dissipation path. The flow guide drive is configured to drive the cooling airflow into the battery pack from the air inlet when the device is started, and then flow along the heat dissipation path to cool the surfaces of the first controller and the second controller in sequence. After that, the airflow flows through the third heat dissipation channel and cools the surface of the drive component before being discharged.

2. The power head according to claim 1, characterized in that, The housing has a first encapsulation cavity and a second encapsulation cavity. The first controller is disposed in the first encapsulation cavity and the second controller is disposed in the second encapsulation cavity. The first encapsulation cavity has a first inlet and a first outlet, and the second encapsulation cavity has a second outlet. Wherein, the first inlet is connected to the second heat dissipation channel, the first outlet maintains the connection between the first encapsulated cavity and the second encapsulated cavity, and the second outlet is connected to the third heat dissipation channel; On the heat dissipation path, when the external cooling airflow flows through the first heat dissipation channel and the second heat dissipation channel, a first direct current heat dissipation path is formed. After the cooling airflow enters the first enclosed cavity, a first vortex heat dissipation path is formed. After the cooling airflow enters the second enclosed cavity, a second vortex heat dissipation path is formed. When the cooling airflow enters the third heat dissipation channel, a second direct current heat dissipation path is formed. In the first vortex heat dissipation path, the cooling airflow fills the first encapsulated cavity; in the second vortex heat dissipation path, the cooling airflow exits from the first encapsulated cavity and fills the second encapsulated cavity.

3. The power head according to claim 2, characterized in that, The mounting surfaces of the first controller and the second controller are located on different planes. The first enclosure cavity is located in the peripheral area of ​​one surface of the housing, the second enclosure cavity is located in the peripheral area of ​​another surface of the housing, and the assembly cavity is located in the internal area of ​​the housing. When the cooling airflow flows along the heat dissipation path, the cooling airflow flows through the inside of the battery pack, enters the inner cavity of the mounting base, surrounds at least two outer surfaces of the housing, and then enters the assembly cavity.

4. The power head according to claim 1 or 2, characterized in that, The mounting base is equipped with a flow guide port, which is connected to the first heat dissipation channel; The battery pack is provided with an air outlet corresponding to the air guide port, and the mounting base is provided with an air guide control structure suitable for controlling the opening or closing of the air guide port.

5. The power head according to claim 4, characterized in that, The flow control structure includes: 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.

6. The power head according to claim 5, characterized in that, 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.

7. The power head according to claim 5, 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.

8. The power head according to claim 6, characterized in that, The two sides of the mounting base are adapted to install the battery pack. After the battery pack is installed, it is locked on the mounting base and presses the force-bearing 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 port opens and the heat dissipation path of the battery pack is connected. When the battery pack is separated from the mounting base, the compressive force on the force-bearing end disappears, the shielding member resets under the action of elasticity and closes the flow port, and the heat dissipation path of the battery pack is closed. 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 battery pack side rotates around the pivot, the connecting end approaches and presses against the shield, the shield on the battery pack side slides on the side of the mounting base, the flow port opens, the heat dissipation path on the side where the battery pack is installed is open, and the shield on the side where the battery pack is not installed remains closed, thus closing the heat dissipation path on the side where the battery pack is not installed.

9. The power head according to claim 8, characterized in that, 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.

10. The power head according to claim 5, characterized in that, 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.

11. The power head according to claim 3, characterized in that, The drive assembly includes a motor installed in the assembly cavity and a flow guide drive connected to the motor shaft of the motor. The flow guide drive is disposed in the assembly cavity on the side near the second covering cavity.

12. The power head according to claim 1, characterized in that, The housing is provided with a support frame, which is supported at the bottom of the mounting base. The support frame is provided with ventilation holes, which keep the first heat dissipation channel and the second heat dissipation channel connected.

13. The power head according to claim 1, characterized in that, A cover is installed on the top of the housing, and a flip cover is rotatably connected to one side of the cover. The flip cover covers the outside of the battery pack. After the flow guide drive is activated, the external cooling airflow flows from the gap between the flip cover and the cover to the air inlet of the battery pack.

14. A power tool, characterized in that, Includes the power head as described in claims 1-13.

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