Heat dissipation structure of electric tool

Abstract

The utility model discloses a heat dissipation structure of an electric tool, which relates to the heat dissipation field of the electric tool, solves the problem of low heat dissipation efficiency of a motor due to the adoption of a single wind path during air cooling heat dissipation in the prior art, and mainly adopts the technical scheme that the heat dissipation structure of the electric tool comprises a shell, the space in the machine shell is divided into an area A and an area B, a motor is installed in the area B, an assembly needing heat dissipation is arranged in the area A, the area A is provided with a first air inlet, the area B is provided with a second air inlet, an area C is arranged between the area A and the area B, and a centrifugal fan arranged in the area C is installed on a rotating shaft of the motor. An air outlet is formed in the position, opposite to the centrifugal fan, of the area C and communicated with the outside, the motor can drive the centrifugal fan to rotate, and air in the area A and the area B is exhausted from the air outlet at the same time. According to the utility model, the problem of low heat dissipation efficiency of the motor during air-cooling heat dissipation can be mainly solved.

Description

Technical Field

[0001] The utility model relates to the heat dissipation of an electric tool, in particular to a heat dissipation structure of an electric tool. Background Art

[0002] The brushless cleaning machines on the market usually use axial flow or centrifugal single-layer fan blades, and place the controller and brushless motor in the casing. The temperature zones are separated by setting wind shield ribs on the casing. The brushless motor shaft is equipped with centrifugal fan blades, and the motor is equipped with a contoured wind hood. The controller heat sink is placed at the fan blade suction port of the motor wind hood. After the motor is started, the hot air is sucked in and blown to the motor. The hot air takes away the heat of the motor and is blown out from the wind hood outlet. With a single air path, the high-temperature air from the radiator is dissipated from the casing window through the motor to achieve system heat dissipation. The heat dissipation efficiency is low. In order to meet the temperature rise, a large motor must be selected, which is costly.

[0003] The hot air of the single air path controller in the existing technology is blown out through the motor, and the heat dissipation efficiency of the motor is low, which is not conducive to temperature rise; in order to meet the temperature rise of the motor, the single air path in the existing technology needs to increase the power of the motor, and a large motor needs to be used instead, which is costly. The problem brought about by this is that a large motor needs to be used, and the overall product weight is heavy, which is not conducive to lightweight products. Utility Model Content

[0004] In order to overcome the problem in the prior art that the single air path used in air cooling causes low heat dissipation efficiency of the motor, the utility model provides a heat dissipation structure of an electric tool, which can solve the problem of low heat dissipation efficiency of the motor in air cooling.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a heat dissipation structure of an electric tool, including a casing, the space inside the casing is divided into area A and area B, a motor is installed in area B, area A is provided with a component to be dissipated, area A is provided with a first air inlet, area B is provided with a second air inlet, area C is provided between area A and area B, a centrifugal fan arranged in area C is installed on the motor shaft, and an air outlet is provided at a relative position between area C and the centrifugal fan to communicate with the outside world, and the motor can drive the centrifugal fan to rotate so that the air in areas A and B is discharged from the air outlet at the same time.

[0006] After adopting the above technical solution, the utility model has the following advantages: through the rotation of the centrifugal fan, the air on both sides of the centrifugal fan can be sucked towards the middle, that is, the outside air connected to area A and the second air inlet is sucked between the centrifugal fans, and the hot air in area A can be discharged through the air outlet. The cold air from the outside passes through the motor, which can cool the motor, and then the hot air is discharged through the air outlet at the radial position of the centrifugal fan; the motor and the component to be cooled are respectively located on both sides of the centrifugal fan, constructing an independent double air duct. Since this layout ensures that the two heat dissipation paths of the motor and the component to be cooled do not conflict with each other and work together, it not only ensures the efficient heat dissipation performance of the component to be cooled, but also significantly improves the heat exchange efficiency of the motor. Therefore, the heat dissipation efficiency of the motor is optimized, which not only extends its service life and enhances its load capacity, but also greatly suppresses the temperature rise during operation. In particular, compared with the traditional solution, this design allows the use of a smaller and more power-adapted motor, which not only achieves the lightweight goal of the product and reduces the overall weight, but also effectively controls cost expenditure.

[0007] Furthermore, the centrifugal fan includes a fan sleeve and centrifugal blades. The fan sleeve is mounted on the rotating shaft of the motor and rotates synchronously with the rotating shaft. A blade baffle is provided inside the centrifugal fan. The blade baffle divides the centrifugal blades into a double-layer structure in the axial direction, with one side facing the motor and the other side facing the component to be dissipated heat, thereby avoiding air convection between areas A and B.

[0008] By adopting the above-mentioned technical solution, the fan blade baffle in the middle of the centrifugal fan blade can avoid air convection between area A and area B, so that all hot air can be discharged through the air outlet.

[0009] Furthermore, the diameter of the suction area enclosed by the inner side of the centrifugal fan blades on the side facing the component to be heat dissipated is D22, and the diameter of the suction area enclosed by the inner side of the centrifugal fan blades on the side facing the motor is D21, and D21>D22.

[0010] By adopting the above-mentioned technical solution, the heat absorption efficiency in the direction of the motor is increased by increasing the heat absorption diameter of the suction area on the side facing the motor, thereby improving the heat dissipation efficiency of the motor. More power of the rotating centrifugal fan is allocated to the heat dissipation of the motor, so that the working time of the motor can be extended and the service life of the motor is increased.

[0011] Furthermore, the area of ​​the centrifugal fan on the side facing the motor is larger than the area of ​​the centrifugal fan on the side facing the component to be heat-dissipated.

[0012] By adopting the above-mentioned technical solution, the area of ​​the centrifugal fan on the side facing the motor is increased, the heat absorption efficiency in the direction of the motor is increased, the heat dissipation efficiency of the motor is improved, and more power of the rotating centrifugal fan is allocated to the heat dissipation of the motor, so that the working time of the motor can be extended and the service life of the motor is increased.

[0013] Furthermore, a wind shield is provided outside the motor, and wind shield ribs are provided inside the casing. The wind shield and the wind shield ribs abut against each other to block the assembly gap between the wind shield and the casing, so that wind flows through the motor inside the wind shield.

[0014] By adopting the above-mentioned technical solution, since the wind cover and the wind shield ribs are abutted to block the assembly gap between the wind cover and the casing, so that the wind can flow through the wind cover, the cold air from the outside can enter the centrifugal fan only after flowing through the motor through the second air inlet, so that the cold air sucked in from the outside can all flow through the motor, thereby improving the heat dissipation efficiency of the motor, avoiding the cold air from flowing to the centrifugal fan from other pipelines, and avoiding the waste of the centrifugal fan's rotation power, and the hot air that needs to be dissipated can directly enter the centrifugal fan in area C for direct heat dissipation.

[0015] Furthermore, the diameter of the centrifugal fan is D1, the suction diameter of the centrifugal fan is D2, a first partition is provided between the centrifugal fan and the motor, the first partition is connected to the wind cover, the inner diameter of the first partition is D4, and D1>D4>D2.

[0016] With the above technical solution, since D1>D4>D2, the partition can allow the hot air dissipated by the motor to be discharged directly from the air outlet through the centrifugal fan, avoiding the air discharged by the centrifugal fan from flowing back to the motor and affecting the heat dissipation efficiency of the motor.

[0017] Furthermore, the diameter of the centrifugal fan is D1, the suction diameter of the centrifugal fan is D2, a second partition is provided between the centrifugal fan and the component to be cooled, the second partition is connected to the inner wall of area A, the inner diameter of the second partition is D3, and D1>D3>D2.

[0018] With the above technical solution, since D1>D3>D2, the air blown out by the centrifugal fan will not flow back to area A.

[0019] Furthermore, the area A and the area C are connected via a horn channel, the large opening of the horn channel faces the component to be cooled, and the small opening faces the centrifugal fan. The small opening of the horn channel is D5, and D1>D5>D2.

[0020] By adopting the above-mentioned technical solution and utilizing the Venturi tube principle, when the fluid passes through a large space through a small space and then enters another large space, the fluid flow rate in the small space will increase and the pressure will decrease. Therefore, the air flow rate at the small mouth of the horn channel will become faster and the pressure will become smaller, thereby forming a pressure difference, further sucking the hot air in area A into the centrifugal fan, increasing the heat absorption efficiency, and improving the heat dissipation efficiency of the components that need heat dissipation.

[0021] Furthermore, the first air inlet is arranged away from the air outlet.

[0022] By adopting the above technical solution, the first air inlet is set on the side away from the air outlet, and the component to be cooled is placed between the first air inlet and the centrifugal fan, thereby improving the cooling efficiency of the component to be cooled.

[0023] Furthermore, the second air inlet is arranged away from the air outlet.

[0024] By adopting the above technical solution, the second air inlet is set on the side away from the air outlet, and the motor is located between the second air inlet and the centrifugal fan, thereby improving the heat dissipation efficiency of the components requiring heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of a heat dissipation structure of an electric tool according to the present invention;

[0027] Figure 2 An exploded diagram of a heat dissipation structure of an electric tool;

[0028] Figure 3 for Figure 1 Enlarged view of point D in the middle.

[0029] Description of the accompanying drawings: 1. Casing; 11. Air outlet; 12. Second air inlet; 13. Speaker channel; 14. Wind shield; 15. First partition; 16. First air inlet; 17. Second partition; 2. Motor; 21. Centrifugal fan; 3. Components requiring heat dissipation; 4. Wind hood; 5. Fan blade baffle. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0031] The terms "first," "second," and so on (if any) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or precedence. Even if "second" is used before a technical feature to distinguish it, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. It should be understood that in this utility model, "plurality" refers to two or more. "And / or" is merely a description of an association between related objects, indicating that three relationships can exist. For example, "X and / or Y" can mean: X exists alone, X and Y exist simultaneously, or Y exists alone. The character " / " generally indicates that the related objects are in an "or" relationship. "Including X, Y, and Z" means that all three of X, Y, and Z are included. "Including X, Y, or Z" means that one of X, Y, and Z is included. "Including X, Y, and / or Z" means that any one, any two, or any three of X, Y, and Z are included.

[0032] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0033] like Figures 1 to 3 As shown, the utility model provides a heat dissipation structure of an electric tool, including a casing 1, the space inside the casing 1 is divided into area A and area B, a motor 2 is installed in the area B, the area A is provided with a component 3 to be cooled, the area A is provided with a first air inlet 16, the area B is provided with a second air inlet 12, and an area C is provided between areas A and B. A centrifugal fan 21 arranged in area C is installed on the rotating shaft of the motor 2, and an air outlet 11 is provided at a relative position between the area C and the centrifugal fan 21 to communicate with the outside world. The motor 2 can drive the centrifugal fan 21 to rotate, so that the air in areas A and B is discharged from the air outlet 11 at the same time.

[0034] After adopting the above technical solution, the utility model has the following advantages: through the rotation of the centrifugal fan 21, the air on both sides of the centrifugal fan 21 can be sucked toward the center, that is, the outside air connected to area A and the second air inlet 12 is sucked between the centrifugal fan 21, and the hot air in area A can be discharged through the air outlet 11. The cold air from the outside passes through the motor 2, which can cool the motor 2, and then the hot air is discharged through the air outlet 11 at the radial position of the centrifugal fan 21; the motor 2 and the heat dissipation component 3 are respectively located on both sides of the centrifugal fan 21, forming an independent double air duct. Since this layout ensures that the two heat dissipation paths of the motor 2 and the heat dissipation component 3 do not conflict with each other and work together, it not only ensures the efficient heat dissipation performance of the heat dissipation component 3, but also significantly improves the heat exchange efficiency of the motor 2. Therefore, the heat dissipation efficiency of the motor 2 is optimized, which not only extends its service life and enhances its load capacity, but also significantly suppresses the temperature rise during operation. In particular, compared with traditional solutions, the present design allows the use of a smaller and more power-adaptable motor 2, which not only achieves the lightweight goal of the product and reduces the overall weight, but also effectively controls the cost expenditure.

[0035] Specifically, area A and area B are on the extended axis of the rotating shaft of the motor 2 .

[0036] Furthermore, the centrifugal fan 21 includes a fan sleeve and centrifugal blades. The fan sleeve is mounted on the rotating shaft of the motor and rotates synchronously with the rotating shaft. A blade baffle 5 is provided in the centrifugal fan 21. The blade baffle 5 divides the centrifugal blades into a double-layer structure in the axial direction, one side facing the motor 2 and the other side facing the heat dissipation component 3, thereby avoiding air convection between areas A and B.

[0037] By adopting the above technical solution, the blade baffle 5 in the middle of the centrifugal blade can avoid air convection between area A and area B, so that all hot air can be discharged through the air outlet 11.

[0038] Furthermore, the diameter of the suction area enclosed by the inner side of the centrifugal fan blades on the side facing the component 3 to be dissipated is D22, and the diameter of the suction area enclosed by the inner side of the centrifugal fan blades on the side facing the motor 2 is D21, and D21>D22.

[0039] By adopting the above-mentioned technical solution, the heat absorption efficiency in the direction of motor 2 is increased by increasing the heat absorption diameter of the suction area on the side facing motor 2, thereby improving the heat dissipation efficiency of motor 2, and allocating more power of rotating centrifugal fan 21 to the heat dissipation of motor 2, so that the working time of motor 2 can be extended, thereby improving the service life of motor 2.

[0040] Specifically, D22 and D21 may be changed as needed to distribute the rotational power of the centrifugal fan 21 .

[0041] Furthermore, the area of ​​the centrifugal fan 21 on the side facing the motor 2 is larger than the area of ​​the centrifugal fan 21 on the side facing the component 3 to be heat-dissipated.

[0042] By adopting the above-mentioned technical solution, by increasing the area of ​​the centrifugal fan 21 on the side facing the motor 2, the heat absorption efficiency in the direction of the motor 2 is increased, the heat dissipation efficiency of the motor 2 is improved, and more power of the rotating centrifugal fan 21 is allocated to the heat dissipation of the motor 2, so that the working time of the motor 2 can be extended, thereby improving the service life of the motor 2.

[0043] Specifically, the area of ​​the centrifugal fan 21 on the side facing the motor 2 and the area of ​​the centrifugal fan 21 on the side facing the component 3 to be heat-dissipated can be changed as needed, so that the rotational power of the centrifugal fan 21 is distributed.

[0044] Furthermore, the motor 2 is provided with a wind shield 4 outside, and the casing 1 is provided with a wind shield rib 14. The wind shield 4 and the wind shield rib 14 abut against each other to block the assembly gap between the wind shield 4 and the casing 1 so that wind flows through the motor 2 inside the wind shield 4.

[0045] By adopting the above-mentioned technical solution, since the wind cover 4 and the wind shield rib 14 are abutted to block the assembly gap between the wind cover 4 and the casing 1, so that the wind can flow through the wind cover 4, the cold air from the outside can enter the centrifugal fan 21 only after flowing through the motor 2 through the second air inlet 12, so that the cold air sucked in from the outside can all flow through the motor 2, thereby improving the heat dissipation efficiency of the motor 2, avoiding the cold air from flowing from other pipelines to the centrifugal fan 21, and avoiding the waste of the rotation power of the centrifugal fan 21, and the hot air that needs to be dissipated by the heat dissipation component 3 can directly enter the centrifugal fan 21 in area C for direct heat dissipation.

[0046] Furthermore, the diameter of the centrifugal fan 21 is D1, the suction diameter of the centrifugal fan 21 is D2, a first partition 15 is provided between the centrifugal fan 21 and the motor 2, the first partition 15 is connected to the wind cover 4, the inner diameter of the first partition 15 is D4, and D1>D4>D2.

[0047] By adopting the above-mentioned technical solution, since D1>D4>D2, the partition 15 can allow the hot air dissipated by the motor 2 to be discharged directly from the air outlet 11 through the centrifugal fan 21, thereby preventing the air discharged by the centrifugal fan 21 from flowing back to the motor 2 and affecting the heat dissipation efficiency of the motor 2.

[0048] Specifically, under the premise of a single-layer centrifugal fan, the diameter of the suction area toward the motor 2 and the diameter of the suction area toward the component to be dissipated 3 are the same, both D2; under the premise of a double-layer centrifugal fan, the diameter of the suction area toward the motor 2 side is D2.

[0049] Furthermore, the diameter of the centrifugal fan 21 is D1, the suction diameter of the centrifugal fan 21 is D2, and a second partition 17 is provided between the centrifugal fan 21 and the component 3 to be dissipated heat. The second partition 17 is connected to the inner wall of area A, and the inner diameter of the second partition 17 is D3, wherein D1>D3>D2.

[0050] With the above technical solution, since D1>D3>D2, the air blown out by the centrifugal fan 21 will not flow back to the A area.

[0051] Specifically, under the premise of a single-layer centrifugal fan, the diameter of the suction area toward the motor 2 and the diameter of the suction area toward the component to be dissipated 3 are the same, both D2; under the premise of a double-layer centrifugal fan, the diameter of the suction area toward the side of the component to be dissipated 3 is D2.

[0052] Furthermore, the area A and the area C are connected via a speaker channel 13, the large opening of the speaker channel 13 faces the component 3 to be cooled, and the small opening faces the centrifugal fan 21. The small opening of the speaker channel 13 is D5, and D1>D5>D2.

[0053] By adopting the above-mentioned technical solution and utilizing the Venturi tube principle, when the fluid passes through a large space through a small space and then enters another large space, the fluid flow rate in the small space will increase and the pressure will decrease. Therefore, the air flow rate at the small mouth of the horn channel 13 will become faster and the pressure will become smaller, thereby forming a pressure difference, further sucking the hot air in area A into the centrifugal fan 21, increasing the heat absorption efficiency, and improving the heat dissipation efficiency of the component 3 to be dissipated.

[0054] Specifically, the small opening of the speaker channel 13 and the wind shield 4 are connected to form an integrally formed design.

[0055] It can be understood that when the diameter of the large opening of the speaker channel 13 is large enough to wrap around the component 3 that needs heat dissipation, the heat dissipation efficiency of the component 3 that needs heat dissipation will be better.

[0056] Furthermore, the first air inlet 16 is arranged away from the air outlet 11 .

[0057] By adopting the above technical solution, the first air inlet 16 is set on the side away from the air outlet 11, so that the component 3 to be cooled is located between the first air inlet 16 and the centrifugal fan 21, thereby improving the cooling efficiency of the component 3 to be cooled.

[0058] It can be understood that there are multiple first air inlets 16 in area A so that the components 3 requiring heat dissipation can be evenly exposed to the cold air for heat dissipation.

[0059] Furthermore, the second air inlet 12 is arranged away from the air outlet 11 .

[0060] By adopting the above technical solution, the second air inlet 12 is set on the side away from the air outlet 11, and the motor 2 is located between the second air inlet 12 and the centrifugal fan 21, thereby improving the heat dissipation efficiency of the component 3 requiring heat dissipation.

[0061] It can be understood that there are multiple second air inlets 12 in area B so that the motor 2 can be evenly exposed to the cold air for heat dissipation.

[0062] In addition to the above-mentioned preferred embodiments, the present invention has other implementation methods. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A heat dissipation structure for an electric tool, comprising a housing (1), characterized in that: The space within the casing (1) is divided into an A zone and a B zone, a motor (2) is installed in the B zone, a heat dissipation component (3) is provided in the A zone, a first air inlet (16) is provided in the A zone, a second air inlet (12) is provided in the B zone, and a C zone is provided between the A zone and the B zone. A centrifugal fan (21) provided in the C zone is installed on the rotating shaft of the motor (2), and an air outlet (11) is provided at a relative position between the C zone and the centrifugal fan (21) for communication with the outside world. The motor (2) can drive the centrifugal fan (21) to rotate, so that the air in the A zone and the B zone is discharged from the air outlet (11) at the same time.

2. The heat dissipation structure of an electric tool according to claim 1, characterized in that: The centrifugal fan (21) comprises a fan sleeve and centrifugal blades. The fan sleeve is sleeved on the rotating shaft of the motor and rotates synchronously with the rotating shaft. A blade baffle (5) is provided in the centrifugal fan (21). The blade baffle (5) divides the centrifugal blades into a double-layer structure in the axial direction, with one side facing the motor (2) and the other side facing the component to be cooled (3), thereby avoiding air convection between area A and area B.

3. The heat dissipation structure of an electric tool according to claim 2, characterized in that: The diameter of the suction area formed by the inner side of the centrifugal fan blades on the side facing the heat dissipation component (3) is D22, and the diameter of the suction area formed by the inner side of the centrifugal fan blades on the side facing the motor (2) is D21, and D21>D22.

4. The heat dissipation structure of an electric tool according to claim 2, characterized in that: The area of ​​the centrifugal fan (21) on the side facing the motor (2) is larger than the area of ​​the centrifugal fan (21) on the side facing the component (3) to be cooled.

5. The heat dissipation structure of an electric tool according to claim 1, characterized in that: A wind shield (4) is provided outside the motor (2), and a wind shield rib (14) is provided inside the housing (1). The wind shield (4) and the wind shield rib (14) abut against each other to block an assembly gap between the wind shield (4) and the housing (1), so that wind flows through the motor (2) inside the wind shield (4).

6. The heat dissipation structure of an electric tool according to claim 5, characterized in that: The diameter of the centrifugal fan (21) is D1, the suction diameter of the centrifugal fan (21) is D2, a first partition (15) is provided between the centrifugal fan (21) and the motor (2), the first partition (15) is connected to the wind cover (4), the inner diameter of the first partition (15) is D4, and D1>D4>D2.

7. The heat dissipation structure of an electric tool according to claim 1, characterized in that: The diameter of the centrifugal fan (21) is D1, the suction diameter of the centrifugal fan (21) is D2, a second partition (17) is provided between the centrifugal fan (21) and the component to be dissipated (3), the second partition (17) is connected to the inner wall of area A, the inner diameter of the second partition (17) is D3, and D1>D3>D2.

8. The heat dissipation structure of an electric tool according to claim 7, characterized in that: The A area and the C area are connected via a speaker channel (13), the large opening of the speaker channel (13) faces the component to be radiated (3), and the small opening faces the centrifugal fan (21), the small opening of the speaker channel (13) is D5, and D1>D5>D2.

9. The heat dissipation structure of an electric tool according to claim 1, characterized in that: The first air inlet (16) is arranged away from the air outlet (11).

10. The heat dissipation structure of an electric tool according to claim 1, characterized in that: The second air inlet (12) is arranged away from the air outlet (11).

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