Brushless fan

Abstract

The utility model relates to a brushless fan, which is characterized in that the brushless fan comprises a shell, an air inlet, a containing cavity and an air outlet are formed in the shell, and the air inlet and the air outlet are communicated with the containing cavity; the stator is arranged on the shell body; the rotor penetrates through the stator and extends into the accommodating cavity, and the rotor is rotatably arranged; the working fan blades are arranged in the containing cavity and connected with the rotor, and the working fan blades are used for sucking air into the containing cavity from the air inlet and outputting the air through the air outlet; the support is arranged on the shell body; the circuit board is connected with the support or the shell, and the circuit board is electrically connected with the stator; a cooling fan blade, wherein the cooling fan blade is connected with the rotor; the circuit board is located between the stator and the cooling fan blades. The support can support the rotor, the circuit board and the fan cover at the same time, and is compact in structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a brushless fan. BACKGROUND

[0002] The fan has a wide range of uses in the field of daily electrical appliances, and is also an important power system of electric appliances such as dust collectors and floor washing machines. The fan has experienced years of development, and its technology is relatively mature, and the product is highly stylized. However, with the improvement of people's living standards and production requirements, there is still a need for further improvement in some performance of the existing fan. For example, the requirement for intelligent control of the fan, and the use of brushless fans is increasing. However, during the use of the brushless fan, as the power requirement increases or the use time is longer, the temperature rise of the circuit board, stator and rotor is high, which affects the service life of the product. SUMMARY

[0003] One of the purposes of the utility model is to overcome the deficiencies in the prior art, and provide a brushless fan with low temperature rise during work.

[0004] To achieve the above purpose, the utility model realizes the following technical scheme:

[0005] The brushless fan comprises:

[0006] A shell, which is provided with an air inlet, a cavity and an air outlet, and the air inlet and the air outlet are communicated with the cavity;

[0007] A stator, which is installed on the shell;

[0008] A rotor, which passes through the stator and extends into the cavity, and the rotor is rotatably arranged;

[0009] A working fan blade, which is arranged in the cavity and connected with the rotor, and the working fan blade is used for sucking air into the cavity from the air inlet and outputting the air through the air outlet;

[0010] A support, which is arranged on the shell;

[0011] A circuit board, which is connected with the support or the shell, and the circuit board is electrically connected with the stator;

[0012] A cooling fan blade, which is connected with the rotor;

[0013] The circuit board is located between the support and the cooling fan blade.

[0014] According to an embodiment of the utility model, the rotor passes through the circuit board.

[0015] According to one embodiment of the present application, the circuit board is provided with a first through hole.

[0016] According to one embodiment of the present application, the support comprises a mounting portion for supporting the rotor, and a support portion extending outwardly from the mounting portion; the rotor passes through the mounting portion and is connected to the mounting portion in a rotatable manner; the support portion is connected to the stator or the housing.

[0017] According to one embodiment of the present application, an upper surface of the support portion is provided with a support column, the support column protrudes from the support portion, and the circuit board is connected to the support column.

[0018] According to one embodiment of the present application, the support portion is provided with a support leg, the support leg protrudes from the support portion, and the support leg is supported on the stator.

[0019] According to one embodiment of the present application, the support leg is provided with a notch adapted to the shape of the edge of the stator, and the support leg is supported on the stator at the notch.

[0020] According to one embodiment of the present application, an upper surface of the support portion is provided with a positioning column, the positioning column protrudes from the support portion, and a jack on the circuit board is matched with the positioning column.

[0021] According to one embodiment of the present application, further comprising a fan cover, the fan cover covers the cooling fan blade, and a second through hole is arranged on the fan cover; the fan cover is connected to the stator or the housing.

[0022] According to one embodiment of the present application, the working fan blade is one or more levels.

[0023] The brushless fan in the present application utilizes the rotor to drive the cooling fan blade to work, and the cooling fan blade works to suck air from outside the fan cover into the fan cover to cool the circuit board, the stator and the rotor. The cooling fan blade drives the air flow, which can take away the heat of the circuit board, the stator and the rotor, so as to reduce the temperature rise. The circuit board is provided with a first through hole, so that the air sucked by the cooling fan blade can pass through the circuit board to blow to the stator, so as to reduce the temperature of the stator. Since the working temperature of the circuit board and the stator can be reduced, the service life is longer. The support in the present application can support the rotor, the circuit board and the fan cover at the same time, and the structure is compact. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is a structural schematic view of the brushless fan in the present application.

[0025] Fig. 2 It is a partial structural schematic view of the brushless fan in the present application.

[0026] Fig. 3 The utility model discloses a support structure schematic view in the utility model. DETAILED DESCRIPTION

[0027] As Figs. 1 to 3 The brushless fan 100 includes a housing 110, a stator 120, a rotor 130 and working blades 140. The housing 110 is provided with an air inlet 111, a cavity 112 and an air outlet 113, and the air inlet 111 and the air outlet 113 communicate with the cavity 112. Fig. 3 The housing 110 is provided with an air inlet 111 at the lower end and a recess 114 at the upper end. The recess 114 does not communicate with the cavity 112.

[0028] The stator 120 is partially installed in the recess 114 of the housing 110 and protrudes out of the recess 114. The stator 120 can be connected with the housing 110 by screws. The rotor 130 penetrates through the stator 120, with one end extending into the cavity 112 and the other end protruding out of the stator 120. The rotor 130 is rotatably arranged. The working blades 140 are connected with the rotor 130. The working blades 140 can be one or more levels. In the example shown in the figure, three working blades 140 are arranged. The three working blades 140 are distributed along the axial direction at intervals.

[0029] The brushless fan 100 further includes a support 150, a circuit board 160, cooling blades 170 and a fan cover 180. The support 150 is connected with the stator 120 and supported by the stator 120. The rotor 130 penetrates through the support 150 and is rotatably connected with the support 150. The circuit board 160 is connected with the support 150. The cooling blades 170 are connected on the rotor 130. The circuit board 160 is located between the support 150 and the cooling blades 170. The fan cover 180 is connected with the support 150 and covers part of the stator 120.

[0030] The bracket 150 comprises a mounting portion 151 and a supporting portion 152. The mounting portion 151 is used for supporting the rotor 130 and is generally circular. The supporting portion 152 extends laterally from the mounting portion 151. In the example shown in the figure, two supporting portions 152 are provided, extending to the two sides from the mounting portion 151 respectively. A supporting column 153 is arranged on the upper surface of the supporting portion 152. The supporting column 153 protrudes upward from the supporting portion 152. As shown in the figure, one supporting column 153 is arranged on each supporting portion 152. A supporting leg 154 is arranged on the lower surface of the supporting portion 152. The lower end of the supporting leg 154 is provided with a notch 155. The shape of the notch 155 is adapted to the shape of the edge of the stator 120, so that the notch 155 can be arranged on the edge of the stator 120. The bracket 150 can also be connected with the stator 120 by screws. A positioning column 156 is arranged on the upper surface of the bracket 150. The positioning column 156 cooperates with a socket (not shown in the figure) on the circuit board 160, and is used for quickly positioning the circuit board 160 during installation. The circuit board 160 is connected on the supporting column 153 by screws. The circuit board 160 is electrically connected with the stator 120, and the stator 120 can be powered through the circuit board 160. The circuit board 160 is provided with a first through hole 161. The fan cover 180 is connected with the bracket 150 by screws, covering the cooling fan blade 170, the bracket 150 and part of the stator 120. The fan cover 180 is provided with a second through hole 181.

[0031] The rotor 130 is rotatably arranged through the housing 110 and the bracket 150. The rotor 130 penetrates the bracket 150 and the circuit board 160. One end of the rotor 130 is provided with the three-stage working fan blade 140, and the other end is provided with the cooling fan blade 170.

[0032] When the brushless fan 100 in the utility model is used, the stator is powered through the circuit board 160, so that the rotor 130 rotates. The rotor 130 drives the working fan blade 140 to rotate when rotating. The working fan blade 140 rotates to suck air from the air inlet 111, and outputs the air after passing through the three-stage working fan blade 140 through the air outlet 113. The rotor 130 drives the cooling fan blade 170 to rotate when rotating. The cooling fan blade 170 rotates to suck cold air from the second through hole 181 of the fan cover 180, and transports the cold air to blow toward the stator 120 through the first through hole 161 of the circuit board 160.

[0033] The brushless fan in the utility model, utilizes the rotor to drive the cooling fan blade to work, and the cooling fan blade sucks the air from outside the air baffle into the air baffle to cool the circuit board, the stator and the rotor when working. The cooling fan blade drives the air flow, and can take away the heat of the circuit board, the stator and the rotor, so that the temperature rise is low. The circuit board is provided with the first through hole, so that the air sucked by the cooling fan blade passes through the circuit board and blows to the stator, so that the temperature of the stator is reduced. Since the utility model can reduce the working temperature of the circuit board and the stator, the service life is longer. The support in the utility model can support the rotor, the circuit board and the air baffle at the same time, and the utility model has compact structure.

[0034] The above is only the preferred embodiment of the utility model, and is not used for limiting the protection scope of the utility model, and any modification, equivalent replacement or improvement in the spirit of the utility model is covered in the claim range of the utility model.

Claims

1. A brushless fan, characterized in that, include: The housing is provided with an air inlet, a cavity and an air outlet, and the air inlet and the air outlet are both connected to the cavity; Stator, which is mounted on the housing; A rotor that passes through the stator and extends into the cavity, the rotor being rotatably disposed; A working fan blade is disposed within the cavity and connected to the rotor. The working fan blade is used to draw air into the cavity from the air inlet and output it through the air outlet. A bracket, which is disposed on the housing; A circuit board, which is connected to the bracket or housing and electrically connected to the stator; A cooling fan blade, which is connected to the rotor; The circuit board is located between the bracket and the cooling fan blade.

2. The brushless fan according to claim 1, characterized in that, The rotor passes through the circuit board.

3. The brushless fan according to claim 1, characterized in that, The circuit board is provided with a first through hole.

4. The brushless fan according to claim 1, characterized in that, The bracket includes a mounting portion for supporting the rotor and a support portion extending outward from the mounting portion; the rotor passes through the mounting portion and is rotatably connected to the mounting portion relative to it; the support portion is connected to the stator or housing.

5. The brushless fan according to claim 4, characterized in that, A support column is provided on the upper surface of the support part, the support column protrudes from the support part, and the circuit board is connected to the support column.

6. The brushless fan according to claim 4, characterized in that, The support portion is provided with a support foot, which protrudes from the support portion and is supported on the stator.

7. The brushless fan according to claim 6, characterized in that, The support foot is provided with a notch that conforms to the shape of the stator edge, and the notch of the support foot is supported on the stator.

8. The brushless fan according to claim 4, characterized in that, The upper surface of the support is provided with a positioning post, which protrudes from the support and the socket on the circuit board mates with the positioning post.

9. The brushless fan according to claim 1, characterized in that, It also includes a fan cover that covers the cooling fan blades and has a second through hole; the fan cover is connected to the stator or the housing.

10. The brushless fan according to claim 1, characterized in that, The working fan blades are of one or more stages.

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