Power tool

Abstract

The utility model relates to an electric tool, include: the shell that extends along the axial, the motor that contains in the shell, the fan that is driven rotation by motor and with motor electric connection's control assembly, the shell includes the first containing portion of containing control assembly and the second containing portion of containing motor, the second containing portion includes the air inlet, the air outlet and the airflow passage between the air inlet and the air outlet, and the fan rotation produces the airflow that flows through the airflow passage, the second containing portion includes the window, control assembly connects to at least one among the first containing portion and the second containing portion, and control assembly partly covers the window, and the part of window is not covered by control assembly constitutes the exposed opening, and the exposed opening fluidly links the first containing portion and the second containing portion, and the part airflow through the surface of control assembly through the exposed opening, thereby improves the cooling effect of control assembly.

Description

Technical Field

[0001] This utility model relates to an electric tool. Background Technology

[0002] Hair dryers, as a common type of power tool, consist of a housing, a motor housed within the housing, a control board that controls the motor's operation, and a battery pack that provides power. To meet the market's demand for high power and high blowing efficiency, hair dryer motors are increasingly operating at higher speeds. This results in the motor, control board, and battery pack getting very hot after a period of operation, potentially shortening the machine's lifespan.

[0003] Therefore, it is indeed necessary to provide an improved power tool to overcome the shortcomings of the existing technology. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an electric tool with a higher heat dissipation effect.

[0005] The present invention addresses the existing technical problems by adopting the following technical solution: A power tool includes: a housing extending axially, a motor housed within the housing, a fan driven to rotate by the motor, and a control component electrically connected to the motor. The housing includes a first housing portion housing the control component and a second housing portion housing the motor. The second housing portion includes an air inlet, an air outlet, and an airflow channel located between the air inlet and the air outlet. The fan rotation generates airflow flowing through the airflow channel. The second housing portion includes a window. The control component is connected to at least one of the first housing portion and the second housing portion, and the control component partially covers the window. The portion of the window not covered by the control component forms an exposed opening, and the exposed opening is in fluid communication with the first housing portion and the second housing portion.

[0006] A further improvement is as follows: the control component includes a control board and a transistor connected to the control board, and the exposed opening is positioned axially close to the transistor.

[0007] A further improvement is that the first receiving portion at least partially surrounds the outer periphery of the second receiving portion and there is a receiving space between them. At least one of the first receiving portion and the second receiving portion includes a fixing rib for connecting the control component. The fixing rib extends radially perpendicular to the axial direction and surrounds the window to at least partially isolate the control component from the receiving space.

[0008] A further improvement is as follows: the window extends radially through the second receiving portion, the control component completely covers the window radially, and the exposed opening is configured as a through groove penetrating the fixing rib.

[0009] A further improvement is as follows: the fixing rib includes a support portion surrounding the outside of the window, the support portion radially supports the control component and includes a first sidewall and a second sidewall arranged opposite each other in the axial direction, the axial distance between the first sidewall and the air inlet is less than the axial distance between the second sidewall and the air inlet, and the through groove axially penetrates the first sidewall.

[0010] A further improvement is as follows: the fixing rib includes a locking portion located on the outside of the first sidewall and the second sidewall, the supporting portion abuts against the first surface of the control component, the locking portion abuts against the second surface of the control component, and the first surface and the second surface are disposed opposite to each other.

[0011] A further improvement is as follows: the support portion includes a third sidewall and a fourth sidewall that connect the first sidewall and the second sidewall, and the fixing rib includes a limiting portion extending from the third sidewall and the fourth sidewall, the limiting portion abutting against two opposite sides of the control component.

[0012] A further improvement is as follows: the window extends radially through the second receiving portion, the second receiving portion includes a fixing rib surrounding the outside of the window, the fixing rib supports the control component in a radial direction perpendicular to the axial direction, the control component covers a portion of the window in a radial direction, and at least a portion of the fixing rib and the control component are spaced apart in the axial direction by a gap, which constitutes the exposed opening.

[0013] A further improvement is as follows: the second receiving portion includes a fixing rib surrounding the outside of the window, the control component includes a housing, a control plate housed within the housing, and several heat dissipation ribs extending from the bottom of the housing, the heat dissipation ribs being exposed toward the window and the inner wall of the fixing rib abutting against a portion of the heat dissipation ribs to restrict the movement of the control component.

[0014] A further improvement is as follows: the control component is located axially between the air inlet and the fan, the housing includes a grip portion connected to the first receiving portion, and the control component is located directly below the grip portion in a radial direction perpendicular to the axial direction.

[0015] Compared with the prior art, the present invention has the following advantages: by providing a window in the second receiving part, the control component at least partially covers the window, and the part of the window not covered by the control component constitutes an exposed opening for fluid communication between the first receiving part and the second receiving part, thereby allowing some airflow to flow through the exposed opening and over the surface of the control component, thus improving the cooling effect of the control component; in addition, by placing the exposed opening close to the transistor with high heat generation, some airflow directly flows over the surface of the transistor, further improving the cooling effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a power tool according to a preferred embodiment of the present invention;

[0017] Figure 2 for Figure 1 The power tool shown is partially sectional after half of its housing has been removed.

[0018] Figure 3 for Figure 2 The diagram shows a partial cross-sectional view of a power tool with its control assembly removed.

[0019] Figure 4 for Figure 1 The diagram shows a partial exploded view of the power tools shown.

[0020] Figure 5 for Figure 1 Partial cross-sectional view of the power tool shown;

[0021] Figure 6 for Figure 5 A close-up view of the control components of the power tool shown;

[0022] Figure 7 This is a partial enlarged view of the control component in another embodiment of the present invention.

[0023] Meaning of the reference numerals in the diagram:

[0024] Hair dryer 100, housing 10

[0025] First receiving section 11, gripping section 111

[0026] Accommodation space 112 Main body 113

[0027] Extension 114 Second Receiving Section 12

[0028] Air inlet 121 Air outlet 122

[0029] Airflow channel 123 First air duct 124

[0030] Second air duct 125, window 126

[0031] Exposed opening 127 Mounting part 13

[0032] Support base 14, fixing rib 15

[0033] Support 151 First sidewall 152

[0034] Second side wall 153 Third side wall 154

[0035] Fourth side wall 155, engaging part 156

[0036] Limiting part 157, Motor 20

[0037] Fan 30 Control Components 40

[0038] Outer shell 41 First surface 411

[0039] Second surface 412 Control board 42

[0040] Transistor 43, Heat dissipation fin 44

[0041] Air blower duct 50, exhaust vent 51

[0042] Battery pack 200 Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0044] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0045] Please refer to Figures 1 to 5 As shown, this utility model relates to a power tool, and more particularly to a hair dryer 100, including a housing 10 extending along the axial direction, a motor 20 housed in the housing 10, a fan 30 driven to rotate by the motor 20, and a control component 40 electrically connected to the motor 20.

[0046] The housing 10 includes a first receiving portion 11 for accommodating a control assembly 40, a grip portion 111 connected to the first receiving portion 11, and a second receiving portion 12 for accommodating a motor 20 and a fan 30. The first receiving portion 11 at least partially surrounds the outer periphery of the second receiving portion 12, and a receiving space 112 is spaced between the first receiving portion 11 and the second receiving portion 12, within which the control assembly 40 is located. The grip portion 111 is connected above the first receiving portion 11, and a gripping space is spaced between the grip portion 111 and the first receiving portion 11.

[0047] The second receiving portion 12 includes an air inlet 121, an air outlet 122, and an airflow channel 123 located between the air inlet 121 and the air outlet 122. The fan 30 rotates to generate airflow through the airflow channel 123. The second receiving portion 12 includes a first air duct 124 and a second air duct 125 fixed inside the first receiving portion 11, arranged sequentially in the axial direction. The air inlet 121 is located at the axial end of the first air duct 124, and the air outlet 122 is located on the axial side of the second air duct 125 opposite to the air inlet 121. The interiors of the first air duct 124 and the second air duct 125 form the airflow channel 123, which extends substantially axially.

[0048] The first receiving portion 11 includes a body portion 113 surrounding the outer periphery of the first air duct 124 and the second air duct 125, and an extension portion 114 extending axially from the body portion 113. In the airflow direction, the extension portion 114 is located downstream of the body portion 113, and the radial dimension of the extension portion 114 is smaller than the radial dimension of the body portion 113. The extension portion 114 is generally cylindrical and located downstream of the second air duct 125. The radial dimension of the extension portion 114 is substantially the same as the radial dimension of the second air duct 125, such that the extension portion 114 constitutes an extension of the airflow passage 123.

[0049] The first air duct 124 forms an air intake area, and the motor 20 and fan 30 are located inside the second air duct 125. The blower 100 also includes a blower pipe 50 detachably fixed to the extension 114, and the inner side of the blower pipe 50 continues to form an extension of the airflow channel 123. An exhaust port 51 is provided at the end of the blower pipe 50 away from the extension 114. The motor 20 drives the fan 30 to rotate and generate airflow that enters the airflow channel 123. The airflow enters the first air duct 124 from the air inlet 121, flows through the second air duct 125, the extension 114 and the blower pipe 50, and is discharged from the exhaust port 51 to form a working airflow.

[0050] The grip 111 is connected to the upper side of the main body 113. The control component 40 is located axially between the air inlet 121 and the fan 30, and radially directly below the grip 111. This makes full use of the space between the grip space and the first air duct 124, saving space and reducing the overall size of the machine.

[0051] The housing 10 includes a mounting portion 13 located at the rear end of the grip portion 111 and a support base 14 located below the body portion 113. The axial rear ends of both the mounting portion 13 and the support base 14 are axially located behind the axial end of the body portion 113. A first air duct 124 at least partially protrudes from the rear side of the body portion 113, such that the air inlet 121 is axially located behind the body portion 113. The battery pack 200 is detachably connected to the mounting portion 13 and is located approximately above and behind the air inlet 121. A portion of the airflow passes over a portion of the surface of the battery pack 200 before entering the air inlet 121, thereby dissipating heat from the battery pack 200.

[0052] The second receiving portion 12 includes a window 126 that fluidly communicates with the airflow channel 123 and the receiving space 112. A control component 40 is connected to at least one of the first receiving portion 11 and the second receiving portion 12, and the control component 40 covers a portion of the window 126. The portion of the window 126 not covered by the control component 40 forms an exposed opening 127, which fluidly communicates with the first receiving portion 11 and the second receiving portion 12.

[0053] At least one of the first receiving portion 11 and the second receiving portion 12 includes a fixing rib 15 for connecting the control assembly 40. The fixing rib 15 extends radially perpendicular to the axial direction and surrounds the window 126. The control assembly 40 is located within the space enclosed by the fixing rib 15 so that the control assembly 40 is at least partially isolated from the receiving space 112.

[0054] In this embodiment, the fixing rib 15 extends radially from the outer periphery of the second receiving portion 12 toward the first receiving portion 11 and into the receiving space 112. In other embodiments, the fixing rib 15 may also extend from the inner side of the first receiving portion 11 toward the second receiving portion 12, or both the first receiving portion 11 and the second receiving portion 12 may be provided with fixing ribs 15 extending radially toward each other.

[0055] Window 126 extends radially through second receiving portion 12 and is generally rectangular. Fixing rib 15 includes a support portion 151 surrounding the outer side of window 126, which radially supports control assembly 40. Support portion 151 includes a first sidewall 152 and a second sidewall 153 arranged axially opposite each other, a third sidewall 154 and a fourth sidewall 155 connecting the first sidewall 152 and the second sidewall 153. First sidewall 152 is axially close to air inlet 121, meaning the axial distance between first sidewall 152 and air inlet 121 is less than the axial distance between second sidewall 153 and air inlet 121.

[0056] The third sidewall 154 and the fourth sidewall 155 extend axially, and the first, second, third, and fourth sidewalls enclose a generally rectangular space in which the control assembly 40 is installed. Each sidewall extends a certain width to form a support surface, and the control assembly 40 abuts against this support surface to be supported radially.

[0057] The control assembly 40 includes a housing 41, a control board 42 housed within the housing 41, transistors 43 and electronic components connected to the control board 42, and a plurality of heat dissipation fins 44 extending from the bottom of the housing 41. The housing 41 includes a first surface 411 at the bottom, a second surface 412 opposite to the first surface 411, and a side surface connecting the first surface 411 and the second surface 412. The first surface 411 radially closes the bottom of the housing 41, and the second surface 412 is at least partially open radially to facilitate mounting the control board 42 into the housing 41. A plurality of heat dissipation fins 44 extend from the first surface 411. The control board 42 is mounted on the bottom of the housing 41, and the transistors 43 and electronic components are mounted on the side of the control board 42 opposite to the bottom of the housing 41.

[0058] The fixing rib 15 includes a locking portion 156 extending radially from the first sidewall 152 and the second sidewall 153. The supporting surface of the supporting portion 151 abuts against the first surface 411 of the control component 40, and the locking portion 156 abuts against the second surface 412 of the control component 40. The first surface 411 and the second surface 412 are arranged opposite to each other to limit the control component 40 radially and axially, preventing the control component 40 from shaking or displacing. In this embodiment, the locking portion 156 forms a hook with a certain elasticity, including a base extending from the supporting portion 151 and a hook extending from the base toward the inside of the fixing rib 15. The top of the hook is provided with a slope, so as to facilitate the radial installation of the control plate 42 into the interior of the fixing rib 15 and abutting against the supporting surface of the supporting portion 151. The engaging portion 156 may extend from the first sidewall 152 and the second sidewall 153, or it may be formed by radially extending from the outer peripheral wall of the second receiving portion 12. The engaging portion 156 is located outside the first sidewall 152 and the second sidewall 153.

[0059] The fixing rib 15 includes limiting portions 157 extending from the third side wall 154 and the fourth side wall 155. The limiting portions 157 abut against two oppositely arranged sides of the control component 40, thereby limiting the control component 40 in the transverse direction perpendicular to the axial and radial directions to prevent it from shaking or displacing.

[0060] In this embodiment, the engaging portion 156 is disposed on the first side wall 152 and the second side wall 153, and the limiting portion 157 is disposed on the third side wall 154 and the fourth side wall 155. However, in other embodiments, the engaging portion 156 may also be disposed on the third side wall 154 and the fourth side wall 155, and the limiting portion 157 may be disposed on the first side wall 152 and the second side wall 153. Alternatively, all four side walls may be provided with the engaging portion 156 and the limiting portion 157, as long as the control component 40 can be limited in the radial, axial and transverse directions.

[0061] The fixing rib 15 is arranged around the outer edge of the window 126. The control component 40 is supported on the support part 151 and its first surface 411 is arranged facing the window 126. Several heat dissipation ribs 44 located on the first surface 411 are exposed facing the window 126, so that part of the airflow passing through the airflow channel 123 can pass through the heat dissipation ribs 44, thereby taking away the heat of the control component 40.

[0062] The radial length of the heat dissipation rib 44 is less than or equal to the radial length of the fixing rib 15, so that although the heat dissipation rib 44 extends toward the window 126 and is exposed, it does not extend into the airflow channel 123, thus avoiding interference with the airflow in the airflow channel 123 and causing airflow loss. In addition, the inner wall of the fixing rib 15 abuts against a portion of the heat dissipation rib 44, that is, a portion of the heat dissipation rib 44 extends into the internal space enclosed by the fixing rib 15. The first side wall 152, the second side wall 153, the third side wall 154, and the fourth side wall 155 abut against portions of the heat dissipation rib 44, thereby further limiting the control component 40 in the lateral and axial directions.

[0063] The control board 42, on the side opposite to the heat dissipation fins 44, is connected to transistor 43 and multiple electronic components. During the operation of the blower 100, transistor 43 (MOS) generates a significant amount of heat. Exposing the heat dissipation fins 44 towards the window 126 can reduce the overall heat of the control board 42 to some extent. To further reduce the heat of transistor 43, the control component 40 abuts against the upper side of the window 126 and partially covers the window 126, so that the part of the window 126 not covered by the control component 40 forms an exposed opening 127. The exposed opening 127 connects the airflow channel 123 and the receiving space 112, allowing some airflow to pass around the control component 40, thereby further dissipating heat from transistor 43.

[0064] The term "partial coverage" as used here is not limited to partial coverage in a single direction. It is sufficient as long as an exposed opening 127 that allows fluid communication between the inner and outer spaces of the second receiving portion 12 is provided. For example, the control component 40 may completely cover the window 126 in the radial direction, but provide an exposed opening 127 in the axial direction that allows fluid communication between the inner and outer spaces of the second receiving portion 12; or, the control component 40 may not completely cover the window 126 in the radial direction, so that the window 126 is partially open upward to form the aforementioned exposed opening 127.

[0065] The following two embodiments will be provided to further illustrate the "partial coverage", but the present invention is not limited to the following two embodiments.

[0066] Combination Figures 2 to 6 As shown, the control component 40 abuts against the four side walls in the radial direction and completely covers the window 126 in the radial direction. The exposed opening 127 is configured as a through groove penetrating the fixing rib 15. The exposed opening 127 may penetrate any one or at least one of the four side walls.

[0067] In this embodiment, the exposed opening 127 is disposed on the first sidewall 152 and is configured as two notches formed by a downward indentation from the top of the first sidewall 152. The first surface 411 of the control component 40 abuts against the support surfaces of the four sidewalls, so that the exposed opening 127 axially connects the window 126 and the receiving space 112. In addition, the exposed opening 127 is disposed axially close to the transistor 43, that is, the exposed opening 127 is disposed on the first sidewall 152 close to the transistor 43, so that airflow can directly flow through the surface of the transistor 43, further improving the cooling effect on the transistor 43. In other embodiments, the exposed opening 127 can be one or more, or a through hole penetrating the first sidewall 152, as long as fluid communication between the window 126 and the receiving space 112 can be achieved.

[0068] Although the control component 40 completely covers the window 126 in the radial direction, by providing an exposed opening 127, the control component 40 does not obstruct the fluid communication between the window 126 and the receiving space 112 in the axial direction. Therefore, even if the control component 40 completely covers the window 126 in a certain direction, as long as an exposed opening 127 is provided in a certain direction or at a certain angle to ensure the fluid communication between the receiving space 112 and the airflow channel 123 through the window 126, it falls under the "partial covering" described in this utility model.

[0069] Figure 7Another embodiment of the present invention is disclosed. The control component 40 radially covers a portion of the window 126; that is, the first surface 411 of the control component 40 is supported on the support surfaces of the second sidewall 153, the third sidewall 154, and the fourth sidewall 155. The first sidewall 152 of the fixing rib 15 is axially spaced from the control component 40 by a gap. The airflow channel 123 and the receiving space 112 are fluidly connected through this gap, which forms the exposed opening 127. The gap between the first sidewall 152 and the control component 40 is also intended to place this gap close to the transistor 43, thereby ensuring that airflow can directly pass over the surface of the transistor 43, improving the cooling effect on the transistor 43.

[0070] In the above embodiment, the window 126 is generally rectangular, and the fixing rib 15 includes four sidewalls that form a rectangle. However, in other embodiments, the window 126 may also be triangular, circular, or other shapes. Correspondingly, the fixing rib 15 may also include three sidewalls corresponding to a triangle, cylindrical sidewalls corresponding to a circle, or other corresponding shapes.

[0071] This invention provides a window 126 in the second receiving portion 12, and the control component 40 at least partially covers the window 126. The portion of the window 126 not covered by the control component 40 forms an exposed opening 127 that fluidly connects the first receiving portion 11 and the second receiving portion 12, thereby allowing some airflow to flow through the exposed opening 127 and over the surface of the control component 40, thus improving the cooling effect of the control component 40. In addition, by placing the exposed opening 127 close to the transistor 43, which generates a lot of heat, some airflow flows directly over the surface of the transistor 43, further improving the cooling effect.

[0072] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions exist for the power tools of this utility model without departing from the principles and scope thereof. The scope of protection of this utility model is defined by the claims.

Claims

1. An electric tool, comprising: A housing extending axially, a motor housed within the housing, a fan driven to rotate by the motor, and a control assembly electrically connected to the motor, the housing including a first housing portion for housing the control assembly and a second housing portion for housing the motor, the second housing portion including an air inlet, an air outlet, and an airflow channel located between the air inlet and the air outlet, the fan rotating to generate airflow flowing through the airflow channel; characterized in that: the second housing portion includes a window, the control assembly is connected to at least one of the first housing portion and the second housing portion, and the control assembly partially covers the window, the portion of the window not covered by the control assembly forming an exposed opening, the exposed opening being in fluid communication with the first housing portion and the second housing portion.

2. The power tool according to claim 1, characterized in that: The control component includes a control board and a transistor connected to the control board, with the exposed opening positioned axially close to the transistor.

3. The power tool according to claim 1, characterized in that: The first receiving portion at least partially surrounds the outer periphery of the second receiving portion and there is a receiving space between them. At least one of the first receiving portion and the second receiving portion includes a fixing rib for connecting the control component. The fixing rib extends radially perpendicular to the axial direction and surrounds the window to at least partially isolate the control component from the receiving space.

4. The power tool according to claim 3, characterized in that: The window extends radially through the second receiving portion, the control component completely covers the window radially, and the exposed opening is configured as a through groove penetrating the fixing rib.

5. The power tool according to claim 4, characterized in that: The fixing rib includes a support portion surrounding the outside of the window, the support portion radially supports the control component and includes a first sidewall and a second sidewall disposed opposite each other in the axial direction, the axial distance between the first sidewall and the air inlet is less than the axial distance between the second sidewall and the air inlet, and the through groove axially penetrates the first sidewall.

6. The power tool according to claim 5, characterized in that: The fixing rib includes a locking portion located on the outer side of the first sidewall and the second sidewall. The supporting portion abuts against the first surface of the control component, and the locking portion abuts against the second surface of the control component. The first surface and the second surface are disposed opposite to each other.

7. The power tool according to claim 5, characterized in that: The support portion includes a third sidewall and a fourth sidewall that connect the first sidewall and the second sidewall. The fixing rib includes a limiting portion extending from the third sidewall and the fourth sidewall, and the limiting portion abuts against two opposite sides of the control component.

8. The power tool according to claim 1, characterized in that: The window extends radially through the second receiving portion, which includes a fixing rib surrounding the outside of the window. The fixing rib supports the control assembly in a radial direction perpendicular to the axial direction. The control assembly radially covers a portion of the window. At least a portion of the fixing rib and the control assembly are spaced apart axially, forming the exposed opening.

9. The power tool according to claim 1, characterized in that: The second receiving portion includes a fixing rib surrounding the outside of the window, and the control assembly includes a housing, a control plate housed within the housing, and a plurality of heat dissipation ribs extending from the bottom of the housing, the heat dissipation ribs being exposed toward the window and the inner wall of the fixing rib abutting against a portion of the heat dissipation ribs to restrict the movement of the control assembly.

10. The power tool according to claim 1, characterized in that: The control component is located axially between the air inlet and the fan, the housing includes a grip portion connected to the first receiving portion, and the control component is located radially perpendicular to the axial direction directly below the grip portion.

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