A heat dissipation mechanism and a power tool provided with the same

Abstract

The utility model discloses a kind of heat dissipation mechanism and electric tool with the mechanism, which includes shell, working assembly, driving motor, and heat dissipation fan, the shell interior is formed with heat dissipation passage, the air inlet and air outlet respectively communicating heat dissipation passage are equipped on the shell;Working assembly is arranged close to the air outlet;Driving motor is arranged on the working assembly upside along longitudinal direction, and is installed in the heat dissipation passage, the driving motor has driving shaft arranged along longitudinal direction, and working assembly is drivingly connected with the lower end of driving shaft;Heat dissipation fan is arranged between the side of driving motor and air inlet along transverse direction, and is installed in the heat dissipation passage, and when heat dissipation fan works, the wind sucked from air inlet is blown to driving motor direction along heat dissipation passage by fanning.The heat dissipation mechanism solves the technical problems that the space height of existing heat dissipation mechanism needs to be additionally increased, the heat dissipation fan cannot work independently, and the side surface of driving motor has low heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power tools, and more particularly to a heat dissipation mechanism and a power tool equipped with the mechanism. Background Technology

[0002] Power tools such as polishing machines, grinding machines, and cutting machines, which require motors to drive the workpiece to rotate at high speeds, generate a lot of heat inside. If the heat cannot be dissipated in time, it can easily affect their performance.

[0003] Existing technology discloses a power tool (Utility Model Publication No.: CN221111198U) which has a cooling fan arranged coaxially with the drive motor on the upper side of the drive motor. The cooling fan is synchronously connected to the drive shaft of the drive motor. When the drive motor is working, the cooling fan rotates with the drive shaft, thereby fanning air towards the drive motor and polishing pad for heat dissipation. In this technical solution, the synchronously connected cooling fan to the upper side of the drive motor increases the height of the power tool, making it unsuitable for operation in some narrow spaces. Moreover, the airflow of the cooling fan varies with the rotation speed of the drive shaft, and it cannot work independently. On the other hand, the axial fan design of the drive motor cannot effectively blow air onto the sides of the drive motor, resulting in low heat dissipation efficiency for the sides of the drive motor. Summary of the Invention

[0004] This utility model addresses the shortcomings of existing technologies by providing a heat dissipation mechanism and an electric tool equipped with the mechanism, thus solving the technical problems of existing heat dissipation mechanisms requiring additional space for the housing height, the inability of the cooling fan to work independently, and the low heat dissipation efficiency of the drive motor side.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A heat dissipation mechanism includes a housing, a working component, a drive motor, and a cooling fan. A heat dissipation channel is formed inside the housing, and the housing has an air inlet and an air outlet respectively connected to the heat dissipation channel. The working component is arranged near the air outlet. The drive motor is arranged longitudinally above the working component and installed within the heat dissipation channel. The drive motor has a longitudinally arranged drive shaft, and the working component is drively connected to the lower end of the drive shaft. The cooling fan is arranged laterally between one side of the drive motor and the air inlet and installed within the heat dissipation channel. When the cooling fan is working, it blows the air drawn in from the air inlet along the heat dissipation channel towards the drive motor.

[0007] Preferably, the drive motor includes a motor body, the upper end of the drive shaft protrudes from the upper end of the motor body and is rotatably connected to the housing through a first bearing installed in the heat dissipation channel; the cooling fan is arranged laterally on the air inlet side of the motor body and is arranged at an upward angle, so that it can fan the air drawn in from the air inlet towards the motor body and the first bearing when working.

[0008] Preferably, the drive shaft is arranged along the first longitudinal axis, and the cooling fan is arranged along the first transverse axis. The first transverse axis and the first longitudinal axis are located on the same longitudinal plane and are arranged at an angle to each other, and the angle is less than 90°.

[0009] Preferably, the inner wall of the housing is provided with a baffle plate arranged on the upper side of the drive motor and the side away from the cooling fan, and the baffle plate forms part of the sidewall structure of the heat dissipation channel.

[0010] Preferably, the inner wall of the housing is provided with a motor mounting base arranged around the motor body, the motor body is mounted on the motor mounting base, and after installation, a spaced channel is formed between the motor body and the housing for air to blow towards the working component, the spaced channel being a partial structure of a heat dissipation channel; and / or,

[0011] The inner wall of the housing is equipped with a motor mounting sleeve along the longitudinal direction. The lower part of the drive shaft protrudes from the lower end of the motor body and is axially supported in the motor mounting sleeve by a second bearing. The working component is arranged on the lower side of the motor mounting sleeve. The motor mounting sleeve is provided with an air passage for air to blow towards the working component. The air passage is part of the heat dissipation channel.

[0012] Preferably, the working component includes an eccentric structure that is driven to the lower end of the drive shaft, a polishing disc that is rotatably connected to the lower side of the eccentric structure off-axis from the drive shaft, and a fan blade structure mounted on the eccentric structure. The air outlet includes a first air outlet duct arranged opposite to the back of the polishing disc. When the working component is working, the fan blade structure rotates with the eccentric structure and fans the air drawn in from the upper side of the fan blade structure to blow it along the heat dissipation channel toward the back of the polishing disc.

[0013] Preferably, the eccentric structure includes an eccentric block that is driven to the lower end of the drive shaft, and a counterweight block arranged around the eccentric block and connected to the eccentric block. The fan blade structure includes a fan blade portion sleeved on the outer periphery of the eccentric block, an upper fastening portion fastened to the upper side of the eccentric block and connected to the fan blade portion, a lower fastening portion fastened to the lower side of the eccentric block and connected to the fan blade portion, and a counterweight channel corresponding to the counterweight block that passes through the eccentric side of the fan blade portion. The counterweight block is positioned within the counterweight channel. The fan blade portion has a plurality of fan blades for fanning.

[0014] Preferably, the inner wall of the housing is provided with a fan mounting base arranged on the air inlet side of the motor body, and the cooling fan includes a fan bracket mounted on the fan mounting base and a fan blade assembly rotatably connected to the fan bracket.

[0015] Preferably, it also includes a circuit board controller. The drive motor is electrically connected to the circuit board controller. The circuit board controller is installed in the heat dissipation channel near the air inlet and is arranged laterally on the air inlet side of the drive motor. When the air in the heat dissipation channel moves from the air inlet to the air outlet, it can exchange heat with the circuit board controller.

[0016] This utility model also provides an electric tool, including the heat dissipation mechanism as described above.

[0017] The beneficial effects achieved by this utility model are as follows:

[0018] The heat dissipation mechanism provided by this utility model features a cooling fan that is independent of the drive motor and arranged laterally on one side of the drive motor. This eliminates the need for additional housing height, making it more suitable for operation in confined spaces. The cooling fan can operate independently of the drive shaft, and its airflow is independent of the drive shaft's rotation speed, facilitating uniform airflow. When the cooling fan is working, it blows the air drawn in from the inlet along the heat dissipation channel towards the drive motor. Since the cooling fan is arranged laterally and the drive motor is arranged longitudinally, it effectively sweeps the side of the drive motor, improving its heat dissipation efficiency. The air, after heat exchange with the drive motor, continues to blow along the heat dissipation channel towards the working components, further cooling them. This improves the heat dissipation effect of the power tool equipped with this mechanism and extends its service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an electric tool according to an embodiment of the present invention.

[0020] Figure 2 This is a partial structural diagram of a power tool according to an embodiment of the present invention. Figure 1 .

[0021] Figure 3 This is an exploded view of a portion of the structure of a power tool according to an embodiment of the present invention.

[0022] Figure 4 This is a partial structural diagram of a power tool according to an embodiment of the present invention. Figure 2 .

[0023] Figure label:

[0024] Housing 1, air inlet 11, first air inlet duct 111, second air inlet duct 112, air outlet 12, first air outlet duct 121, second air outlet duct 122, baffle plate 13, bearing mounting base 131, motor mounting base 14, motor fixing sleeve 15, fan mounting base 16, controller mounting base 17, main body shell 18, grip shell 19, first half shell 1a, second half shell 1b;

[0025] Working component 2, polishing disc 21, eccentric structure 22, eccentric block 221, counterweight block 222, fan blade structure 23, fan blade section 231, fan blade 2311, upper fastening part 232, lower fastening part 233, counterweight channel 234;

[0026] Drive motor 3, motor body 31, drive shaft 32, first bearing 33, second bearing 34;

[0027] Cooling fan 4, fan blade assembly 41, fan bracket 42;

[0028] 5. Circuit board controller; 6. Switching components; 7. Speed ​​regulating components;

[0029] Heat dissipation channel 10, first channel segment 101, second channel segment 102, third channel segment 103, interval channel 104, air passage channel 105, and moving channel 106;

[0030] First vertical axis L1, first horizontal axis L2, first air intake path S1, second air intake path S2. Detailed Implementation

[0031] like Figures 1-4As shown in the figure, as an embodiment of the present invention, a power tool including a heat dissipation mechanism is provided. The heat dissipation mechanism includes a housing 1, a working component 2, a drive motor 3, and a cooling fan 4. A heat dissipation channel 10 is formed inside the housing 1, and the housing 1 has an air inlet 11 and an air outlet 12 respectively connected to the heat dissipation channel 10. The working component 2 is arranged near the air outlet 12. The drive motor 3 is arranged longitudinally on the upper side of the working component 2 and installed within the heat dissipation channel 10. The drive motor 3 has a longitudinally arranged drive shaft 32, and the working component 2 is driven by the lower end of the drive shaft 32, enabling it to rotate under the drive of the drive shaft 32. The cooling fan 4 is arranged laterally between one side of the drive motor 3 and the air inlet 11 and is installed within the heat dissipation channel 10. When the cooling fan 4 is working, it blows the air drawn in from the air inlet 11 along the heat dissipation channel 10 towards the drive motor 3. In this embodiment, the heat dissipation mechanism, since the cooling fan 4 is set as an independent structure relative to the drive motor 3 and is arranged laterally on one side of the drive motor 3, does not require additional space height setting of the housing 1, making it more suitable for operation in some narrow spaces. Moreover, the cooling fan 4 can work independently of the drive shaft 32, and the fan speed of the cooling fan 4 does not change with the rotation speed of the drive shaft 32, which facilitates the independent and uniform airflow. When the cooling fan 4 is working, it blows the air drawn in from the air inlet 11 along the heat dissipation channel 10 towards the drive motor 3. Since the cooling fan 4 is arranged laterally and the drive motor 3 is arranged longitudinally, it can effectively blow the side of the drive motor 3, improving the heat dissipation efficiency of the side of the drive motor 3. The air after heat exchange with the drive motor 3 continues to blow towards the working component 2 along the heat dissipation channel 10, dissipating heat from the working component 2, thereby improving the heat dissipation effect of the power tool equipped with this heat dissipation mechanism and extending the service life of the power tool.

[0032] like Figure 2 As shown, in this embodiment, the drive motor 3 includes a motor body 31, and the upper end of the drive shaft 32 protrudes from the upper end of the motor body 31. It is rotatably connected to the housing 1 via a first bearing 33 installed within the heat dissipation channel 10, improving the rotational stability of the drive shaft 32. A cooling fan 4 is arranged laterally on the air intake side of the motor body 31 and tilted upwards. During operation, it blows the air drawn in from the air inlet 11 towards the motor body 31 and the first bearing 33, dissipating heat from both the motor body 31 and the first bearing 33. This prevents the high-speed rotating first bearing 33 from overheating and being damaged, thus affecting the normal operation of the drive motor 3.

[0033] like Figure 2As shown, in this embodiment, the drive shaft 32 is arranged along the first longitudinal axis L1, and the cooling fan 4 is arranged along the first transverse axis L2. The first transverse axis L2 and the first longitudinal axis L1 are located on the same longitudinal plane and are arranged at an angle to each other, and the angle is less than 90°, so that the fan direction of the cooling fan 4 can take into account both the motor body 31 and the first bearing 33. Optionally, the angle is less than 90° and greater than 70°, especially when it is 80° or near the angle, the effect of taking into account both is the best.

[0034] In this embodiment, a baffle plate 13 is provided on the inner wall of the housing 1, which is arranged on the upper side of the drive motor 3 and the side away from the cooling fan 4. The baffle plate 13 forms part of the side wall structure of the heat dissipation channel 10. By blocking the wind from spreading upward or away from the cooling fan 4, the wind can bounce downward and towards the cooling fan 4 after blowing towards the baffle plate 13. This forces the wind to blow downward along the axial direction of the heat dissipation channel 10 to the inside and outer periphery of the motor body 31 for heat dissipation, and blow towards the side of the motor body 31 away from the cooling fan 4 for heat dissipation. This provides all-round airflow heat dissipation to the inside and outer periphery of the motor body 31, improves the airflow guidance of the heat dissipation channel 10, and improves the heat dissipation effect on the motor body 31.

[0035] In this embodiment, a bearing mounting seat 131 is provided on a portion of the wind baffle 13 arranged on the upper side of the drive motor 3. The first bearing 33 is mounted on the bearing mounting seat 131, which can enhance the stability of the wind baffle 13 structure and make the first bearing 33 close to the wind baffle 13. This allows the first bearing 33 to be cooled by the wind blowing towards the wind baffle 13, and also by the wind rebounding from the wind baffle 13, thus improving the heat dissipation effect of the first bearing 33.

[0036] like Figure 3As shown, in this embodiment, a motor mounting base 14 protrudes from the inner wall of the housing 1 and is arranged around the motor body 31. The motor body 31 is mounted on the motor mounting base 14, and after installation, a spaced channel 104 is formed between the motor body 31 and the housing 1 to allow air to be blown towards the working component 2. A motor fixing sleeve 15 is installed longitudinally on the inner wall of the housing 1. The lower part of the drive shaft 32 protrudes from the lower end of the motor body 31 and is axially supported in the motor fixing sleeve 15 by a second bearing 34. Thus, the drive shaft 32 is stably supported by the first bearing 33 and the second bearing 34, further improving the rotational stability of the drive shaft 32. The motor fixing sleeve 15 is provided with an air passage 105 to allow air to be blown towards the working component 2. The working component 2 is arranged on the lower side of the motor fixing sleeve 15. The spaced channel 104 and the air passage 105 are respectively set as part of the structure of the heat dissipation channel 10, ensuring that the air flowing through the motor body 31 can flow along the heat dissipation channel 10 towards the working component 2 to continue to dissipate heat from the working component 2 or be discharged to the outside from the air outlet 12.

[0037] like Figure 2 As shown, in this embodiment, the working component 2 includes an eccentric structure 22 that is driven to the lower end of the drive shaft 32, a polishing disc 21 that is rotatably connected to the lower side of the eccentric structure 22 off the axis of the drive shaft 32, and a fan structure 23 mounted on the eccentric structure 22. The setting of the rotation axis of the polishing disc 21 being off the rotation axis of the drive shaft 32 can increase the working area of ​​the polishing disc 21, reduce the polishing force, and avoid the risk of polishing through. The air outlet 12 includes a first air outlet duct 121 arranged opposite to the back of the polishing disc 21. When the working component 2 is working, the fan structure 23 rotates with the eccentric structure 22 and fans the air drawn in from the upper side of the fan structure 23 along the heat dissipation channel 10 towards the back of the polishing disc 21 to blow and dissipate heat from the polishing disc 21. The polishing disc 21 and the first air outlet duct 121 are arranged with a gap for the air to be blown out to the outside through the gap. In this embodiment, within the heat dissipation channel 10, the cooling fan 4 draws external air into the heat dissipation channel 10 through the air inlet 11 and blows it toward the motor body 31 and the first bearing 33. At the same time, the fan blade structure 23 draws air from the direction of the motor body 31 and the first bearing 33 into the heat dissipation channel 10 and blows it toward the polishing disc 21 and out through the gap between the polishing disc 21 and the first air outlet 121, forming a heat dissipation cycle.

[0038] like Figure 3As shown, in this embodiment, the eccentric structure 22 includes an eccentric block 221 that is connected to the lower end of the drive shaft 32, and a counterweight block 222 arranged around the eccentric block 221 and connected to it. The counterweight block 222 is used to ensure the balance of the eccentric structure 22 and ensure that the eccentric structure 22 can rotate smoothly. The fan blade structure 23 includes a fan blade portion 231 sleeved on the outer periphery of the eccentric block 221, an upper fastening portion 232 fastened to the upper side of the eccentric block 221 and connected to the fan blade portion 231, a lower fastening portion 233 fastened to the lower side of the eccentric block 221 and connected to the fan blade portion 231, and a counterweight channel 234 corresponding to the counterweight block 222 that passes through the circumference of the fan blade portion 231. The fan blade portion 231 is axially fastened through the upper fastening portion 232 and the lower fastening portion 233. Connected to the eccentric block 221, the counterweight block 222 is positioned within the counterweight channel 234, further axially limiting the fan blade 231 to the upper and lower sides of the counterweight block 222, and circumferentially limiting the fan blade 231 to the left and right sides of the counterweight block 222. This ensures that the fan blade structure 23 is stably connected to the eccentric structure 22, preventing axial or circumferential movement relative to the eccentric structure 22, thus facilitating synchronous rotation between the fan blade structure 23 and the eccentric structure 22. The fan blade 231 has several fan blades 2311 for fanning, allowing the fan blades 2311 to direct the airflow from the upper side of the fan blade structure 23 towards the back of the polishing disc 21 when the fan blade structure 23 rotates.

[0039] like Figure 3 As shown, in this embodiment, the inner wall of the housing 1 is provided with a fan mounting seat 16 arranged on the air inlet side of the motor body 31. The cooling fan 4 includes a fan bracket 42 mounted on the fan mounting seat 16 and a fan blade assembly 41 rotatably connected to the fan bracket 42. The fan bracket 42 is used to support the rotation of the fan blade assembly 41. The fan bracket 42 and the fan blade assembly 41 are an integral structure, which facilitates the installation or removal of the cooling fan 4.

[0040] like Figure 4 As shown, this embodiment also includes a circuit board controller 5, with the drive motor 3 electrically connected to the circuit board controller 5. The housing 1 is equipped with a switch 6 and a speed regulator 7, both electrically connected to the circuit board controller 5. The switch 6 is used to start or stop the drive motor 3, and the speed regulator 7 is used to adjust the rotational speed of the drive shaft 32. The cooling fan 4 can be electrically connected to the circuit board controller 5 or directly to the power supply component, so that the cooling fan 4 starts when the power tool is powered on. Alternatively, a separate control button can be provided on the housing 1 to start or adjust the cooling fan 4.

[0041] In this embodiment, the circuit board controller 5 is installed in the heat dissipation channel 10 near the air inlet 11 and is arranged laterally on the air inlet side of the drive motor 3. When the air in the heat dissipation channel 10 moves from the air inlet 11 to the air outlet 12, it can exchange heat with the circuit board controller 5. This allows the air in the heat dissipation channel 10 to carry away the heat of the circuit board controller 5, avoiding the risk of the circuit being burned out or the machine crashing due to the excessive temperature of the circuit board controller 5. This enhances the heat dissipation effect of the power tool equipped with this heat dissipation mechanism and extends the service life of the power tool.

[0042] In this embodiment, the air inlet 11 includes a first air inlet duct 111 and a second air inlet duct 112 arranged between the first air inlet duct 111 and the air outlet 12. The circuit board controller 5 is arranged between the first air inlet duct 111 and the second air inlet duct 112. The drive motor 3 is arranged between the second air inlet duct 112 and the air outlet 12 and is electrically connected to the circuit board controller 5. The cooling fan 4 is arranged between the second air inlet duct 112 and the drive motor 3. When the cooling fan 4 is working, it blows the air drawn in from the first air inlet duct 111 and the second air inlet duct 112 along the heat dissipation channel 10 toward the drive motor 3, and the air drawn in from the first air inlet duct 111 can exchange heat with the circuit board controller 5 as it moves toward the cooling fan 4. In this embodiment, through the multi-air intake design, and with the circuit board controller 5 arranged between the first air intake 111 and the second air intake 112, the cold air drawn in through the first air intake 111 and the warm air formed after heat exchange with the circuit board controller 5, and the cold air drawn in through the second air intake 112 are respectively fanned to the drive motor 3 by the cooling fan 4. Thus, while the circuit board controller 5 is cooled by cold air, the drive motor 3 can also be cooled by the combined blowing of cold and warm air. At the same time, the circuit board controller 5 and the drive motor 3 are effectively cooled, which greatly improves the airflow utilization rate in the heat dissipation channel 10.

[0043] In this embodiment, a controller mounting base 17 protrudes from the inner wall of the housing 1. The circuit board controller 5 is mounted on the controller mounting base 17. After installation, a moving channel 106 is formed between the circuit board controller 5 and the housing 1, allowing the air drawn in from the first air inlet duct 111 to move towards the cooling fan 4. The moving channel 106 is set as part of the structure of the cooling channel 10, ensuring that the air drawn in from the first air inlet duct 111 can both cool the circuit board controller 5 and flow along the cooling channel 10 towards the cooling fan 4 to continue cooling the drive motor 3.

[0044] In this embodiment, movable channels 106 are formed between the upper side of the circuit board controller 5 and the housing 1, and between the lower side of the circuit board controller 5 and the housing 1, respectively, for the air drawn in from the first air inlet duct 111 to move toward the cooling fan 4. This allows the air drawn in from the first air inlet duct 111 to blow on the upper and lower sides of the circuit board controller 5, increasing the contact area between the air and the circuit board controller 5 and improving the heat dissipation efficiency of the circuit board controller 5.

[0045] In this embodiment, the heat dissipation channel 10 includes a first channel section 101 arranged on the side of the circuit board controller 5 away from the cooling fan 4, and a second channel section 102 arranged on the side of the circuit board controller 5 close to the cooling fan 4. The first air inlet duct 111 and the moving channels 106 arranged on the upper and lower sides of the circuit board controller 5 are respectively connected to the first channel section 101. The second air inlet duct 112 is connected to the second channel section 102, so that the air drawn in from the first air inlet duct 111 can flow into the moving channels 106 on the upper and lower sides of the circuit board controller 5 through the first channel section 101, and flow to the second channel section 102 through the two moving channels 106 to converge, so as to facilitate the unified fan direction of the cooling fan 4 to drive the motor 3.

[0046] like Figure 1 As shown, in this embodiment, the housing 1 includes a main outer shell 18 and a gripping outer shell 19 connected to one side of the main outer shell 18. A heat dissipation channel 10 is arranged along the interior of the main outer shell 18 and the gripping outer shell 19. The drive motor 3 is installed inside the main outer shell 18, and the circuit board controller 5 is installed inside the gripping outer shell 19. The housing 1 has a high internal space utilization rate. A first air inlet duct 111 is located at the rear of the gripping outer shell 19, and a second air inlet duct 112 is located at the front of the gripping outer shell 19, preventing the operator from accidentally touching the first air inlet duct 111 or the second air inlet duct 112 when gripping the gripping outer shell 19, thus avoiding airflow obstruction. The upper end of the drive shaft 32 is rotatably connected to the main outer shell 18 via a first bearing 33 installed in the heat dissipation channel 10. The cooling fan 4 can blow air from the first air inlet duct 111 and the second air inlet duct 112 towards the motor body 31 and the first bearing 33 during operation.

[0047] like Figure 3As shown, in this embodiment, the housing 1 includes a first half-shell 1a and a second half-shell 1b that are detachably connected to each other. The main housing 18 and the gripping housing 19 are respectively formed by the first half-shell 1a and the second half-shell 1b. The first air inlet duct 111 and the second air inlet duct 112 are respectively arranged on the lower side of the circuit board controller 5, and the first air inlet duct 111 is respectively provided on the first half-shell 1a and the second half-shell 1b, and the second air inlet duct 112 is respectively provided on the first half-shell 1a and the second half-shell 1b, so that air can be drawn in from the two first air inlet ducts 111 and the two second air inlet ducts 112 respectively, thereby increasing the air intake volume. In other embodiments, the first air inlet duct 111 may be provided only on either the first half-shell 1a or the second half-shell 1b, or the second air inlet duct 112 may be provided only on either the first half-shell 1a or the second half-shell 1b, or the first air inlet duct 111 may be provided on both the first half-shell 1a and the second half-shell 1b, or the second air inlet duct 112 may be provided on both the first half-shell 1a and the second half-shell 1b.

[0048] like Figure 1 As shown, in this embodiment, the grip shell 19 and the main shell 18 are arranged at an angle. The second air inlet duct 112 is located at the angle connection between the grip shell 19 and the main shell 18, and has a first air inlet path S1 towards the inside of the grip shell 19 and a second air inlet path S2 towards the inside of the main shell 18. The heat dissipation channel 10 includes a third channel section 103 arranged between the second air inlet duct 112 and the fan blade structure 23. The second air inlet duct 112 is connected to the third channel section 103 along the second air inlet path S2, so that the warm air after heat exchange with the drive motor 3 and the cold air drawn in from the outside through the second air inlet path S2 are respectively fanned towards the back of the polishing disk 21 through the fan blade structure 23, and blown out to the outside through the gap between the polishing disk 21 and the first air outlet duct 121. Thus, while dissipating heat from the drive motor 3, the polishing disk 21 can also be purged and dissipated by the combined blowing of cold and warm air, realizing the overall heat dissipation of the circuit board controller 5, the drive motor 3, and the working component 2, and further improving the airflow utilization rate in the heat dissipation channel 10.

[0049] In this embodiment, the second air inlet duct 112 is configured with an opening diameter larger than that of the first air inlet duct 111, which increases the air intake volume of the second air inlet duct 112, thereby increasing the cooling rate of the cooling fan 4 blowing air towards the drive motor 3, which is more conducive to blowing and cooling the drive motor 3. A filter frame is installed outside the second air inlet duct 112, and a filter screen is provided on the filter frame. The filter screen is used to prevent debris from being sucked into the housing 1 and affecting the normal operation of the drive motor 3.

[0050] like Figure 1As shown, in this embodiment, the air outlet 12 also includes a second air outlet 122 opened on the housing 1 near the eccentric structure 22, which improves the efficiency of warm air output in the housing 1 and prevents warm air from accumulating in the housing 1 and failing to effectively dissipate to the outside.

[0051] In summary, the above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall fall within the scope of the patent of the present utility model.

Claims

1. A heat dissipation mechanism, characterized in that, include: The housing has a heat dissipation channel inside, and the housing is provided with an air inlet and an air outlet that are respectively connected to the heat dissipation channel; The working components are arranged close to the air outlet; A drive motor is arranged longitudinally on the upper side of the working component and installed in the heat dissipation channel. The drive motor has a drive shaft arranged longitudinally, and the working component is connected to the lower end of the drive shaft for transmission. A cooling fan is arranged laterally between one side of the drive motor and the air inlet, and is installed in the heat dissipation channel. When the cooling fan is working, it blows the air drawn in from the air inlet along the heat dissipation channel toward the drive motor.

2. The heat dissipation mechanism according to claim 1, characterized in that: The drive motor includes a motor body, the upper end of the drive shaft protrudes from the upper end of the motor body and is rotatably connected to the housing through a first bearing installed in the heat dissipation channel; the cooling fan is arranged laterally on the air intake side of the motor body and is arranged at an upward angle, so that it can fan the air drawn in from the air intake towards the motor body and the first bearing when working.

3. The heat dissipation mechanism according to claim 2, characterized in that: The drive shaft is arranged along the first longitudinal axis, and the cooling fan is arranged along the first transverse axis. The first transverse axis and the first longitudinal axis are located on the same longitudinal plane and are arranged at an angle to each other, and the angle is less than 90°.

4. The heat dissipation mechanism according to claim 2, characterized in that: The inner wall of the housing is provided with a baffle plate arranged on the upper side of the drive motor and the side away from the cooling fan. The baffle plate forms part of the side wall structure of the heat dissipation channel.

5. The heat dissipation mechanism according to claim 2, characterized in that: The inner wall of the housing is provided with a motor mounting base arranged around the motor body. The motor body is mounted on the motor mounting base, and after installation, a spaced channel is formed between the motor body and the housing for air to blow towards the working component. The spaced channel is part of the structure of a heat dissipation channel; and / or, The inner wall of the housing is equipped with a motor mounting sleeve along the longitudinal direction. The lower part of the drive shaft protrudes from the lower end of the motor body and is axially supported in the motor mounting sleeve by a second bearing. The working component is arranged on the lower side of the motor mounting sleeve. The motor mounting sleeve is provided with an air passage for air to blow towards the working component. The air passage is part of the heat dissipation channel.

6. The heat dissipation mechanism according to claim 1, characterized in that: The working assembly includes an eccentric structure that is driven to the lower end of the drive shaft, a polishing disk that is rotatably connected to the lower side of the eccentric structure off-axis from the drive shaft, and a fan blade structure mounted on the eccentric structure. The air outlet includes a first air outlet duct arranged opposite to the back of the polishing disk. When the working assembly is working, the fan blade structure rotates with the eccentric structure and fans the air drawn in from the upper side of the fan blade structure to blow it along the heat dissipation channel toward the back of the polishing disk.

7. The heat dissipation mechanism according to claim 6, characterized in that: The eccentric structure includes an eccentric block that is connected to the lower end of the drive shaft, and a counterweight block arranged around the eccentric block and connected to the eccentric block. The fan blade structure includes a fan blade portion sleeved on the outer periphery of the eccentric block, an upper fastening portion fastened to the upper side of the eccentric block and connected to the fan blade portion, a lower fastening portion fastened to the lower side of the eccentric block and connected to the fan blade portion, and a counterweight channel corresponding to the counterweight block that passes through the eccentric side of the fan blade portion. The counterweight block is positioned within the counterweight channel. The fan blade portion has several fan blades for fanning.

8. The heat dissipation mechanism according to any one of claims 1-7, characterized in that: The inner wall of the housing is provided with a fan mounting base arranged on the air inlet side of the motor body. The cooling fan includes a fan bracket mounted on the fan mounting base and a fan blade assembly rotatably connected to the fan bracket.

9. The heat dissipation mechanism according to claim 8, characterized in that: It also includes a circuit board controller. The drive motor is electrically connected to the circuit board controller. The circuit board controller is installed in the heat dissipation channel near the air inlet and is arranged laterally on the air inlet side of the drive motor. When the air in the heat dissipation channel moves from the air inlet to the air outlet, it can exchange heat with the circuit board controller.

10. A power tool, characterized in that: Includes the heat dissipation mechanism as described in any one of claims 1-9.

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