TWM458781U - Fan structure of external circuit - Google Patents

Description

Fan structure of external circuit

The present invention relates to a fan structure of an external circuit, and more particularly to a fan structure in which a circuit board is disposed on an outer side of a frame.

A conventional heat dissipation fan, such as the Republic of China Patent Publication No. I386156, discloses a heat dissipation fan comprising a frame, a bearing system, a stator member and a rotor member, the rotor member being correspondingly disposed on the periphery of the stator member, the rotor member and the stator member They are housed in the fan frame. The fan frame includes a bottom and a shaft seat. The shaft seat is formed to protrude upward from the center of the bottom of the fan frame. The top end of the shaft seat is an open end, and a receiving space is formed in the center thereof. An annular recess is formed at an inner circumference of the top end portion of the shaft seat and communicates with the receiving space. The inner diameter of the top end of the shaft seat at the position of the annular recess is larger than the inner diameter of the rest of the inner portion of the shaft seat. The center of the bottom of the fan frame is recessed from the bottom surface to form a cylindrical receiving groove. The receiving groove is opposite to the receiving space in the shaft seat but is not in communication. The stator member is sleeved on the outer edge of the shaft seat, and a sleeve is sleeved on the shaft, and the buckle is fixed to the top end of the shaft seat. The stator member comprises a circuit board and an armature formed by stacking a plurality of layers of silicon steel sheets. The outer armature of the armature is wound to generate an alternating magnetic field, and the winding is electrically connected to the circuit board. Insulation sheet to avoid electrical contact between the armature and the winding.
The above conventional problem has the following problem: when the fan is driven to operate, the driving current of the circuit board is operated, and at this time, the electronic components on the circuit board cause a large amount of thermal energy due to the operation of the driving current, since the circuit board is located below the armature And in the axial direction, the space formed between the circuit board and the armature is limited, so that the thermal energy dissipation is poor, thereby reducing the service life of each electronic component on the circuit board. Furthermore, since the current motor design incorporates additional control functions, additional electronic components must be added. In order to effectively integrate the drive and additional control functions, the above-mentioned electronic components added to achieve the control function must be added together with the original The electronic components are integrated into the circuit board together. However, since the area of the electronic components disposed on the circuit board is limited by the maximum outer diameter of the motor, the electronic components have the disadvantage that the arrangement is not easy.
In view of the above problems, the latter is disclosed, for example, in the Republic of China Patent Publication No. M337965, which discloses a cooling fan including a frame body and a fan wheel. The frame body has an air inlet end surface, an air outlet end surface, an inner wall, an axial air flow passage and a bearing portion, and the air inlet end surface and the air outlet end surface are respectively located on two sides of the axial air flow passage frame; The axial air flow passage penetrates the frame body, and the inner wall forms the axial air flow passage; the fan wheel is disposed in the frame body, and the outer circumference of the fan wheel is provided with a plurality of blades; wherein the bearing portion is formed in the frame The carrier portion includes a first side wall, a second side wall and a bearing space. The first side wall is formed by at least a portion of the inner wall; the second side wall is spaced apart from the first side wall; and the bearing space is formed between the first side wall and the second side wall, To carry a drive circuit board. Thereby, the heat dissipation effect of the driving circuit board is increased and the axial thickness of the stator is increased to increase the output torque of the motor, thereby increasing the fan air volume.
However, this conventional problem has its problems. One part of the frame forms a bearing portion, which causes the thickness of the frame to increase, is not easy to be placed in a device with limited space, and increases the overall weight of the fan.

In view of the above problems, the main purpose of the present invention is to provide a circuit board disposed on the outer side of the frame without increasing the thickness of the frame, in addition to obtaining a large space for placing more electronic components, which can help The fan structure of the external heat sink circuit of the circuit board.
In order to achieve the above object, the present invention provides a fan structure of an external circuit, comprising: a frame body having an air inlet end, an air outlet end, an inner wall, an outer wall, an axial air flow path and a portion. The wind end and the air outlet end are respectively located at two sides of the frame body, the inner wall defines the axial air flow passage, the axial air flow passage penetrates the frame body, the seat portion is located in the axial air flow passage and is connected via a plurality of support portions The inner wall; the stator is disposed on the seat portion; a fan wheel is disposed on the seat portion of the frame body corresponding to the stator, the fan wheel is provided with a plurality of blades on the outer circumference; and a circuit board is disposed on the outer wall And electrically connecting the stator. The circuit board has a connecting side flat on a part or the whole area of the outer wall, and an outer side contacting the external environment. Furthermore, the inner wall and the outer wall are solid bodies.
With the above structure of the present invention, the thickness of the frame is reduced, and the electronic components having more space on the circuit board are provided, and heat dissipation is facilitated.

11‧‧‧ frame
111‧‧‧Inlet
112‧‧‧ wind outlet
113‧‧‧ inner wall
114‧‧‧ outer wall
115‧‧‧ axial airflow
116‧‧‧
1161‧‧‧ hollow shaft tube
117‧‧‧Support components
12‧‧‧ Stator
13‧‧‧fan wheel
131‧‧‧ fan leaves
1311‧‧‧wind side
1312‧‧‧wind side
1313‧‧‧ outside
14‧‧‧ boards
141‧‧‧Connecting side
142‧‧‧ outside

The following figures are intended to make the present invention easier to understand, and the drawings are described in detail herein and form part of the specific embodiments. Through the specific embodiments herein and with reference to the corresponding drawings, the specific embodiments of the present invention are explained in detail, and the function principle of the creation is explained.
Figure 1 is a three-dimensional exploded view of the creation;
Figure 2 is a three-dimensional combination diagram of the creation;
Figure 3 is a schematic cross-sectional view of the combination of the creation;
Fig. 4 is a schematic view showing another embodiment of the creation of the circuit board on the outer wall surface of the frame.

The preferred embodiment of the present invention will be described with reference to the related drawings, in which the same elements will be described with the same element symbols.
The present invention discloses an axial flow fan, which has a frame body 11 which can be a square frame body or an annular frame body. The frame body has an axial air flow passage so that when a fan wheel 13 is driven to rotate, the air flow can be circulated. The axial air flow path 115. The first figure is a three-dimensional exploded view of the creation, the second figure is a three-dimensional combination diagram of the creation, and the third figure is a schematic sectional view of the creation.
As shown in the first to third embodiments, the present invention includes a frame 11, a stator 12, a fan wheel 13, and at least one circuit board 14. The frame 11 is an annular frame, but is not limited thereto. The stator frame 12 and the fan wheel 13 are disposed in the frame body 11. The fan wheel 13 has a plurality of blades 131 disposed on an outer circumferential surface of the fan wheel 13. The blades 131 extend radially outward, and the fan wheel 13 is rotatable relative to the stator 12. Each blade 131 has an air inlet side 1311 and an air outlet side 1312 and an outer side 1313.
The frame body 11 has an air inlet end 111, an air outlet end 112, an inner wall 113, an outer wall 114, an axial air flow path 115 and a portion 116. The air inlet end 111 and the air outlet end 112 are respectively formed on two sides of the frame body 11. The axial air flow path 115 is defined by the inner wall 113 and penetrates the frame body 11. The seat portion 116 is disposed at the air outlet end 112. The outer portion of the seat portion 116 is provided with a plurality of supporting members 117 connected to the inner wall 113 to support the seat portion 116 in the axial air flow passage 115. A protruding hollow shaft tube 1161 is provided. The inner wall 113 and the outer wall 114 are solid bodies.
The stator 12 includes a silicon steel sheet composed of a plurality of silicon steel sheet stacks disposed between an insulating frame group, and a coil group is wound around the silicon steel sheet group and the insulating frame group. The stator 12 is sleeved outside the shaft barrel 1161 and is disposed on the seat portion 116.
The fan wheel 13 is disposed on the seat portion 116 corresponding to the stator 12. The air inlet side 1311 of the fan blades 131 corresponds to the air inlet end 111 of the frame body 11, and the air outlet side 1312 corresponds to the air outlet end 112. 1313 corresponds to the inner wall 113.
The circuit board 14 is disposed on the outer wall 114 and electrically coupled to the stator 12. In an implementation, the circuit board 14 has a connecting side 141 that is flat on a portion of the surface of the outer wall 114 and an outer side 142. External environment. In another embodiment, as shown in FIG. 4, the circuit board 14 is flat on the entire surface of the outer wall 114.
The manner of the connection between the circuit board 14 and the outer wall 114 may be a glued or a protruding button on the outer wall 114 corresponding to a through hole on the circuit board 14 or a blind hole in the outer wall 114, corresponding circuit The through hole in the plate 14 is inserted through the through hole and the blind hole by a screw locking member to lock the circuit board 14.
When the fan wheel 13 is driven by the circuit board 14, the airflow is driven from the air inlet end 111 of the frame body 11 through the axial air flow path 115 and then out from the air outlet end 112. The heat generated by the circuit board 14 is radiated to the outer wall 114 by the outer wall 114 in contact with the outside air for heat dissipation, except that the heat generated by the circuit board 14 is in contact with the outside air 142. The circuit board 14 is not limited to the conventional placement. The limitation on the base has a larger or more space, and the circuit board 14 can be provided with more electronic components in response to various functions.
In summary, the present circuit board 14 is directly disposed on the outer wall 114 of the frame body 11. Compared with the front case frame 11, there is no need to separately provide the receiving space to accommodate the circuit board 14, and the thickness of the frame body 11 is not increased. It will not increase.
Although the present invention is disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present invention. The scope of the patent application is subject to the provisions of the attached patent application.

11‧‧‧ frame

111‧‧‧Inlet

112‧‧‧ wind outlet

113‧‧‧ inner wall

114‧‧‧ outer wall

115‧‧‧ axial airflow

116‧‧‧

1161‧‧‧ hollow shaft tube

117‧‧‧Support components

12‧‧‧ Stator

13‧‧‧fan wheel

131‧‧‧ fan leaves

1311‧‧‧wind side

1312‧‧‧wind side

1313‧‧‧ outside

14‧‧‧ boards

141‧‧‧Connecting side

142‧‧‧ outside

Claims (3)

A fan structure of an external circuit, comprising:
a frame body having an air inlet end, an air outlet end, an inner wall, an outer wall, an axial air flow path and a portion, the air inlet end and the air outlet end are respectively located on two sides of the frame body, the inner portion a wall defining the axial airflow passage, the axial airflow passage penetrating the frame body, the seat portion is located in the axial airflow passage and connecting the inner wall via a plurality of support portions, and a hollow shaft cylinder protrudes from the seat portion;
a stator, sleeved on the outside of the barrel and disposed on the seat;
a wheel, disposed on the seat of the frame corresponding to the stator, the fan wheel is provided with a plurality of blades on the outer circumference;
A circuit board is disposed on the outer wall and electrically connected to the stator. The fan structure of the external circuit of claim 1, wherein the circuit board has a connecting side flat on a part or an entire area of the outer wall, and an outer side contacts the outside. The fan structure of the external circuit of claim 1, wherein the inner wall and the outer wall are solid bodies.