TWI457506B - Fan with airflow guiding structure - Google Patents

Description

Fan with flow guiding structure

This invention relates to a fan, and more particularly to a fan that can vary the direction of airflow and can accommodate a motor circuit within the flow directing structure.

With the continuous improvement of the performance of electronic devices, heat sinks or heat dissipation systems have become one of the indispensable devices in current electronic devices. Because the heat energy generated by the electronic devices is not properly dissipated, the performance is deteriorated. It can cause the electronic device to burn out. The heat sink is more important for microelectronic components (such as integrated circuits, ICs), because with the increase in the degree of integration and the advancement of packaging technology, the area of the integrated circuit is continuously reduced, and accumulated per unit area. The thermal energy is relatively higher, so the heat dissipation device with high heat dissipation performance has been actively developed by the electronics industry.

In today's heat sinks, the most widely used users are fans. According to the direction of the inlet and outlet of the fan, the fan can be divided into an axial fan and a centrifugal fan. The airflow of the conventional axial fan flows from the air inlet and then flows out through the air outlet. The direction in which the air inlet flows in is substantially the same as the direction in which the airflow flows out of the air outlet. Compared with the conventional centrifugal fan, the direction in which the airflow flows in from the air inlet is substantially perpendicular to the direction in which the airflow flows out from the air outlet.

Compared with the axial flow fan, the centrifugal fan can achieve the purpose of changing the direction of the wind, but has the disadvantages of low efficiency, low air volume, and high noise. Moreover, if the fan is reduced and simplified, Under the premise of versatility design, how to provide more functions under the original function of the fan frame body is also the inventor's effort to study the patent of the present invention.

It is an object of the present invention to provide a fan having a flow guiding structure by means of a flow guiding junction The shape of the structure can change the flow direction of the axial flow fan and change the direction of the wind. It can also maintain the advantages of high efficiency, large air volume and low noise of the traditional axial flow fan.

Another object of the present invention is to provide a fan having a flow guiding structure, and a first space is disposed in the flow guiding structure and near the bottom portion, so that a circuit device that is originally disposed outside the fan body for driving the impeller rotation can be installed. In the first space, the effect of saving the space and protecting the circuit device through the flow guiding structure itself is achieved.

To achieve the above object, the present invention provides a fan including an impeller, a motor, and a flow guiding structure. The impeller has a hub and a plurality of blades, the blades are disposed outside the hub; the motor is coupled to the impeller, the motor includes a shaft tube portion and a first circuit device for driving the impeller to rotate; the flow guiding structure is The base of the motor, the flow guiding structure directly carries one of the stators of the motor, and the lower portion has a first space, and the shaft tube portion and the top surface of the flow guiding structure are vertically connected, and the shaft tube portion and the diversion tube The structure is integrally formed, and the first circuit device is fixed in the first space of the flow guiding structure. The outer diameter of the diversion structure is gradually expanded from the top of the diversion structure to the bottom of the diversion structure. When the impeller rotates, the airflow flows from an air inlet, and then flows along the torus outside the diversion structure and is formed by an air outlet. It flows out, and the direction in which the airflow flows out of the air outlet is different from the direction in which the airflow flows in from the air inlet.

According to the above description, the fan with the flow guiding structure of the present invention has an outer diameter of the guiding structure which is gradually expanded from the top of the guiding structure to the bottom of the guiding structure, so that the airflow follows the outer ring of the guiding structure. When the surface flows and is sent out, its flow direction is changed; and a first space is disposed in the flow guiding structure, so that the motor circuit can be installed in the first space. Compared with the prior art, the present invention not only achieves the purpose of changing the direction of the wind, but also has the advantages of high efficiency, large air volume, and low noise, and has the advantages of space saving and protection of the circuit through the flow guiding structure itself.

1‧‧‧fan

11‧‧‧ Impeller

111‧‧·wheels

112‧‧‧ fan leaves

113‧‧‧ Balance hole

114‧‧‧Into the wind trough

115‧‧‧ bottom

116‧‧‧ Ribs

117‧‧‧Into the air hole

12‧‧‧ motor

121‧‧‧ shaft tube department

122‧‧‧Second space

123‧‧‧K hook section

13‧‧‧Guide structure

131‧‧‧ top surface

132‧‧‧ top

133‧‧‧ bottom

134‧‧‧ outer annulus

135‧‧‧First space

136‧‧‧ inner side wall

137‧‧‧Perforation

138‧‧‧Locking components

14‧‧‧First circuit device

15‧‧‧Second circuit device

151‧‧‧Perforation

16‧‧‧ Guide ring

17‧‧‧ Cover

18‧‧‧Air inlet

19‧‧‧air outlet

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a fan in accordance with a preferred embodiment of the present invention.

Fig. 2 is a cross-sectional view taken along line A-A' of Fig. 1;

Fig. 3 is an exploded perspective view of the fan and the cover of Fig. 1.

Referring to FIG. 1 to FIG. 3 simultaneously, the fan 1 of the present invention may be an axial flow fan, including an impeller 11, a motor 12, a flow guiding structure 13, a first circuit device 14, and a first The two circuit device 15, a guiding ring 16 and a cover plate 17 are used as the base of the motor 12.

The impeller 11 has a hub 111 and a plurality of blades 112. The blades 112 are disposed on the outer surface of the hub 111, and the motor 12 is coupled to the impeller 11 for driving the impeller 11 to rotate. Furthermore, the upper surface of the hub 111 has a plurality of balance holes 113. When the impeller 11 of the fan 1 is unbalanced, the balance hole 113 can be filled with an appropriate balance material according to the state in which the impeller 11 is shaken. The impeller 11 of the fan 1 can be balancedly rotated without shaking.

Moreover, the hub 111 of the fan 1 has an air inlet 114 in the center thereof, and the inner wall surface of the air inlet slot 114 is hollowed out, and communicates with the space of the motor 12 and the second circuit device 15 in the hub 111, and the air inlet 114 A plurality of ribs 116 are looped between the bottom surface 115 and the hub 111 at an appropriate spacing, and the ribs 116 are used to strengthen the bonding strength between the bottom surface 115 of the wind tunnel 114 and the hub 111, and pass through the ribs 116. In the interval, a plurality of air inlet holes 117 are formed on the inner wall surface of the air inlet groove 114. At this time, the air volume can pass through the air inlet port 18 of the fan 1, and can also pass through the air inlet hole of the inner wall surface of the air inlet groove 114. 117, the effect of dissipating heat from the motor 12 and the second circuit device 15 is achieved by the amount of air entering the air inlet hole 117.

The flow guiding structure 13 is disposed under the motor 12 to carry the motor 12, and one of the top surfaces 131 of the flow guiding structure 13 is perpendicularly connected to one of the shaft portions 121 of the motor 12, and the outer diameter of the guiding structure 13 is self-guided. The top portion 132 of the flow structure 13 is gradually expanded to the bottom portion 133 of the flow guiding structure 13 such that the outer annular surface 134 of the flow guiding structure 13 forms at least one curved surface (or a slope); in other embodiments, the shaft portion of the motor 12 121 and the flow guiding structure 13 may also be integrally formed.

The inner annular surface of the guide ring 16 is coupled to the outer edge of the fan blade 112. The top edge of the guide ring 16 forms the air inlet 18 of the fan 1. The bottom edge of the guide ring 16 and the outer ring of the flow guiding structure 13 The air outlet 19 of the fan 1 is formed between the faces 134, and the diameter of the guide ring 16 is tapered from the top edge of the guide ring 16 to the top edge of the joint between the guide ring 16 and the blade 112 to guide More airflow flows in through the air inlet 18, wherein the direction in which the airflow flows in from the air inlet 18 is substantially perpendicular to the direction in which the airflow exits the air outlet 19.

When the impeller 11 is rotated by the motor 12, the guide ring 16 is coupled to the impeller 11 Rotating together, and the airflow flows in from the air inlet 18, and then flows along the outer annular surface 134 of the flow guiding structure 13 to flow out through the air outlet 19, so that the direction of the airflow flowing out of the air outlet 19 is different from the airflow by the air inlet 18 The direction of the inflow, that is, the direction in which the airflow flows in from the air inlet 18 is substantially perpendicular to the direction in which the airflow flows out of the air outlet 19, and functions as a conventional centrifugal fan; therefore, the shape of the flow guiding structure 13 The design can achieve the effect of changing the direction of the air flow of the axial flow fan and the pressure loss of the air flow during the change of the flow direction.

Furthermore, a first space 135 is provided in the flow guiding structure 13 of the present invention and adjacent to the bottom portion 133 for the first circuit device 14 (for example, a converter) which is originally disposed outside the fan 1 for driving the rotation of the impeller 11. (Inverter), controller (Controller) or motor drive circuit can be mounted on the inner side wall 136 of the first space 135 by at least one locking element 138 (such as a screw or rivet or other component having a fixed function). The space saving and the structural strength of the flow guiding structure 13 itself are achieved to achieve the effect of protecting the first circuit device 14 and the like.

The top surface 131 of the flow guiding structure 13 has at least one through hole 137 for electrically connecting the circuit of the first circuit device 14 to the outside or the second circuit device 15 through the through hole 137. The cover plate 17 of the embodiment is connected to the bottom of the inner side wall 136 of the flow guiding structure 13, and when the cover plate 17 is closed at the bottom of the flow guiding structure 13, the first circuit device installed in the first space 135 is provided. 14 hidden inside and not exposed. In other embodiments, the first circuit device 14 can also be fixed to the cover plate 17 by at least one locking component 138 instead of being fixed to the inner side wall 136 of the flow guiding structure 13 .

In the embodiment, the second circuit device 15 can be a circuit board, and the circuit board is provided with a driving circuit of the motor 12, and the second circuit device 15 is disposed at a distance between the motor 12 and the top surface 131 of the flow guiding structure 13. The second space 122 is formed in a predetermined height, and the circuit board has at least one through hole 151 for connecting with the hook portion 123 below the stator of the motor 12. In other embodiments, the second circuit device 15 can also be fixed to the motor 12 by at least one locking component.

In summary, the present invention is designed by the shape of the flow guiding structure, and even if the outer diameter of the flow guiding structure is gradually expanded from the top of the guiding structure to the bottom of the guiding structure, the axial flow fan can be changed. The direction of the wind reaches the function of the centrifugal fan, and it can maintain the advantages of high efficiency of the axial flow fan, large air volume, and low noise. Furthermore, the invention is within the flow guiding structure and is close to the bottom A first space is provided, so that the circuit device originally disposed outside the fan body for driving the impeller can be installed in the first space, which can save space and protect the circuit device through the flow guiding structure itself.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1‧‧‧fan

111‧‧·wheels

112‧‧‧ fan leaves

12‧‧‧ motor

121‧‧‧ shaft tube department

122‧‧‧Second space

123‧‧‧K hook section

13‧‧‧Guide structure

131‧‧‧ top surface

132‧‧‧ top

133‧‧‧ bottom

134‧‧‧ outer annulus

135‧‧‧First space

136‧‧‧ inner side wall

137‧‧‧Perforation

138‧‧‧Locking components

14‧‧‧First circuit device

15‧‧‧Second circuit device

151‧‧‧Perforation

16‧‧‧ Guide ring

17‧‧‧ Cover

18‧‧‧Air inlet

19‧‧‧air outlet

Claims (8)

a fan having an air inlet and an air outlet, the fan comprising: an impeller having a hub and a plurality of blades, wherein the blades are disposed outside the hub; a motor coupled to the impeller The motor includes a shaft tube portion and a first circuit device for driving the impeller to rotate; and a flow guiding structure as a base of the motor, the flow guiding structure directly carrying a stator of the motor, the diversion The structure has a first space, the shaft tube portion is perpendicularly connected to a top surface of the flow guiding structure, and the shaft tube portion is integrally formed with the flow guiding structure, and the first circuit device is solid. Provided in the first space of the flow guiding structure, the outer diameter of the guiding structure is gradually expanded from the top of one of the guiding structures to the bottom of one of the guiding structures, and the airflow is from the inlet when the impeller rotates The tuyere flows in, and flows along the outer annular surface of the diversion structure to flow out from the air outlet, and the direction in which the airflow flows out from the air outlet is different from the direction in which the airflow flows in from the air inlet. The fan of claim 1, wherein a top surface of the flow guiding structure has at least one through hole for electrically connecting the first circuit device to the outside, or the first circuit device is at least A locking component is fixed to an inner sidewall of the first space of the flow guiding structure, and the first circuit device is a converter, a controller or a motor driving circuit. The fan of claim 1, further comprising a cover connected to a bottom of an inner side wall of the first space of the flow guiding structure, and the first circuit device is by at least one lock The fixing component is fixed to the cover plate, and the locking component is a screw, a rivet or other component having a locking function. The fan of claim 1, wherein the motor is at a predetermined height from a top surface of the flow guiding structure to form a second space, and the fan further includes a second circuit device disposed on the first In the second space and connected to the motor, the second circuit device comprises a circuit board on which the drive circuit of the motor is arranged. The fan of claim 4, wherein the circuit board is secured by at least one The component is fixed to the motor, and the locking component is a screw, a rivet or other component having a fixed function, and the circuit board has at least one through hole for connecting with a hook portion under the stator of the motor. The fan of claim 1, further comprising a guiding ring coupled to the fan blades, the top of the guiding ring forming the air inlet, the bottom of the guiding ring The air outlet is formed between the edge and the outer annular surface of the flow guiding structure, and the direction of the airflow flowing from the air inlet is substantially perpendicular to the direction in which the airflow flows out from the air outlet. The fan of claim 6, wherein the inner annular surface of the guiding ring is coupled to the outer edge of the fan blade, or the diameter of the guiding ring is gradually increased from the top edge of the guiding ring. Retracted to the top edge of the junction of the guide ring and the blades. The fan of claim 1 or 7, wherein the hub has an air inlet groove in the center thereof, and an inner wall surface of the air inlet groove is hollowed out and communicates with a space in the motor in the hub. a plurality of ribs are connected between the bottom surface of one of the air inlet slots and the hub at an appropriate spacing, and a plurality of air inlet holes are formed on the inner wall surface of the air inlet slot through the spacing of the ribs. For this airflow to pass.