JP2006002749A - Heat dissipation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-dissipating device which increases wind pressure and enhances stability. <P>SOLUTION: A heat-dissipating device comprises a fan frame equipped with at least one air inlet and air outlet, and at least one rotor blade which is mounted in the fan frame, which has at least one blade and in which at least one air inlet has an extended wall surface and a training structure. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat dissipation device, and more particularly to a centrifugal fan that increases wind pressure and improves stability.

  As shown in FIG. 1, the known blower includes an outer frame 10, a motor 11, a fan blade structure 12, and an upper lid 13. The outer frame 10 includes an opening 101 serving as an air outlet of the blower, and the motor 11 is fitted on the base 102 of the outer frame 10 to roll on the fan blade structure 12. The upper lid 13 has a circular opening 131 that serves as an air inlet of the blower. The fan blade structure 12 further includes a hub 121, an annular plate 122, and a plurality of blades 123 provided on the annular plate 122. However, during the design of known blowers, the blades are in direct contact with the flow path, thus reducing the heat dissipation effect.

  In addition, there are some known blowers that reinforce the structural design by adding several ribs to the wind inlet or the wind outlet. However, the rib can not only provide a flow-conducting effect or a backflow preventing action, but also becomes an obstacle to the flow field generated by the blower. Therefore, it can be said that there is no substantial effect of improving the fluid performance of the blower.

  An object of this invention is to provide the heat-dissipating device which increases a wind pressure significantly and improves stability.

  Another object of the present invention is to provide a heat dissipation device that lengthens a pressurizing process in which air flows through a fan blade to prevent a rapid change in the wind pressure of the airflow.

  In order to achieve the above object, a heat dissipation device of the present invention includes a fan frame having at least one wind inlet and at least one wind outlet, and at least one blade unit installed in the frame. It comprises at least one rotor blade provided with at least one wind inlet and an extended wall surface and a plurality of flow guide structures, and increases the wind pressure of the heat dissipation device to improve the stability.

  Preferably, the fan frame includes a first frame and a second frame. The first frame has a bottom seat for receiving the rotor blade, and at least one air inlet is formed on the second frame.

  Preferably, the wall surface extends toward the inside of the fan frame, divides the space in the frame to define the air collecting passage, has a convex edge at one end of the wall surface, and defines the inlet of the air collecting passage. The at least one blade unit extends in the horizontal radial direction toward the vicinity of the inlet of the air collecting passage. The altitude of the air collecting path and the flow altitude flowing through the rotor blades and the flow are partially or completely overlapped, and the cross sectional area of the air collecting path is substantially equal to the cross sectional area of the wind outlet.

  In addition, a base is further installed in the wind inlet of the second frame, and the plurality of flow guide structures are installed between the base and the wall surface to increase the wind pressure of the heat dissipation device. The plurality of flow guiding structures are preferably rectangular, flat plate, curved, or airfoil. The plurality of flow guiding structures are fixed to the surface of the base or the wall surface.

  Preferably, a part of the first diversion structure of the plurality of diversion structures is connected between the base and the wall surface, and a part of the second diversion structure is connected to the base and the wall surface at both ends, Is discontinuous and forms a free end. A part of the first diversion structure and a part of the second diversion structure are alternately arranged at intervals.

  Alternatively, a part of the first diversion structure of the plurality of diversion structures is connected between the base and the wall surface, a part of the second diversion structure is connected to the wall surface at one end, and the other end is a free end, One part of the third flow guiding structure is connected to the base, and the other end is a free end. A part of the first diversion structure, a part of the second diversion structure, and a part of the third diversion structure are alternately arranged at intervals.

  Preferably, the plurality of flow guiding structures have an inclination angle, and the shape thereof is similar to the blade shape of the rotor blade.

  In addition, the bottom seat has a sleeve base that holds the bearing. Further, a bearing is provided inside the base of the second frame, and the rotation axis of the rotor blade is jointly supported to improve stability during high-speed rotation. And reduce the occurrence of vibration.

  Preferably, the rotor blade further includes an annulus, a bottom plate, and at least one blade unit. At least one blade unit extends downward from the outer periphery of the ring portion to the bottom plate surface. Or at least 1 blade unit consists of a 1st blade unit and a 2nd blade unit, and both are arrange | positioned alternately, or arrange | positioned up and down or left and right. Of course, the scale, number, and shape of the first blade unit and the second blade unit may be homologous or heterologous.

  In addition, an axial compression type air passage is provided in the fan frame.

  Preferably, the heat dissipating device is a unidirectional air intake type blower, a reverse hook centrifugal fan, a bidirectional air intake type blower, or an axial flow fan.

  Furthermore, preferably, the heat dissipation device is provided with another set of flow guide structures at at least one air outlet.

  In addition, the heat dissipating device further includes a driving device, is fitted on the sleeve base of the bottom seat, and is coupled to the rotor blade to drive the rotor blade.

  The heat dissipating device of the present invention greatly increases the wind pressure, improves the stability, and lengthens the pressurization process through which the air flows through the fan blades, thereby preventing the wind pressure of the airflow from changing rapidly. can do.

  2 to 4 show a first embodiment of the heat dissipation device of the present invention. In this embodiment, the centrifugal fan is taken as an example, but other design methods can be applied to the centrifugal fan. The centrifugal fan is a single-direction air inlet type blower, and mainly includes a first frame 21, a second frame 22, a drive device 23, an iron housing 24, and a rotor blade 25. The first frame 21 has a sleeve base 211 on which the driving device 23 is placed. The bearing 231 is placed in the sleeve base 211 to support the rotating shaft 27 of the rotor blade 25. The second frame 22 includes a wind inlet 221 and a wall surface 222 extending downward from the inner edge of the wind inlet. After the second frame 22 and the first frame 21 are combined, the second frame 22 and the second frame 22 are separated by the wall surface 222. A space formed after the combination of one frame 21 is divided to define a space in which the air collecting passage 26 and the rotor blade 25 are placed. At the same time, the air outlet 212 is formed. The bottom end of the wall surface has a convex edge 223 that extends outward in the radial direction, and defines an inlet 261 of the air collecting passage.

  The rotor blade 25 is driven by the driving device 23 and includes an annulus 251, a bottom plate 252, a first blade unit 253, and a second blade unit 254. Both the first blade unit 253 and the second blade unit 254 are composed of a plurality of blades, and the first blade unit 253 extends downward from the outer periphery of the ring portion 251 to the surface of the bottom plate 252. The arrangement method of the first blade unit 253 and the second blade unit 254 is an alternating arrangement as shown in FIG. Of course, the scale, shape, and arrangement method of the first blade unit 253 and the second blade unit 254 include the design as shown in FIG. 2, but are not limited to this. For example, the first blade unit 253 and the second blade unit 254 may be vertically arranged, and both scale and shape may be homologous or heterologous.

  A base 224 is further installed at the wind inlet of the second frame 22 and a plurality of flow guide structures 225 are installed between the base 224 and the wall surface 222 to increase the wind pressure of the centrifugal fan.

  When the centrifugal fan is operated, the air flow is sucked from the wind inlet 221, passes through the first blade unit 253 and the second blade unit 254 of the rotor blade, and further passes through the inlet 261 located in the air collecting passage 26. The air is introduced into the air collecting passage 26, and pressurization and gas holding are performed to prevent a rapid change in the wind pressure. Further, a high-pressure air flow is discharged from the air outlet 212.

  In this embodiment, the wall surface extending downward at the wind inlet edge of the centrifugal fan leaves only a small wind outlet, and separates the air collecting passage 26 and the rotor blade 25 to pressurize the air flow passing through the rotor blade. Prolong the process to prevent rapid changes in pressure. The height of the air collecting path and the flow height passing through the rotor blade and the guide flow partially or completely overlap with each other on the rotor blade in the axial direction, thereby achieving the purpose of reducing the thickness of the centrifugal fan. The cross-sectional area of the air collecting path 26 is substantially equal to the cross-sectional area of the air outlet 212. Thereby, it can avoid that work efficiency falls by the change of an area of airflow.

  In addition, the present invention adopts a bidirectional motor fixing design as shown in FIG. 4, and in addition to arranging the bearing 231 in the sleeve base 211, the bearing 232 is separately installed on the base 224 of the second frame 22. Provided inside, the rotating shaft 27 of the rotor blade 25 is jointly supported to improve the stability of the fan operating at high speed and reduce the occurrence of vibration. In addition, the present invention employs an axial compression airway 29 design as shown in FIG.

  However, as shown in FIGS. 2 to 4, the plurality of flow guide structures 225 installed on the second frame 22 are connected between the base 224 and the wall surface 222, and the shape thereof is similar to that of the rotor blade. The design changes other than the airfoil structure are shown in FIGS. 5 to 8, and the plurality of flow guide structures 225 in FIG. It is connected in between. The plurality of current guide structures 225 in FIG. 6 are divided into two parts, the first current guide structure part is connected to a rod-like structure 225a between the base 224 and the wall surface 222, and the second current guide structure part is Both ends are connected between the base 224 and the wall 222, the middle part is discontinuous, and the two parts of the diversion structures 225a and b forming the free end 225b are alternately spaced apart. Is arranged. 7 are divided into three portions 225a, 225b, and 225c. The first flow 225a is connected between the base 224 and the wall surface 222, and the second flow 225b is connected to one end. Is connected to the wall 222, the other end is a free end, the third flow 225c is connected to the base 224, and the other end is a free end. The three-port flow structures 225a, 225b, and 225c are spaced from each other. Are alternately arranged with a gap between them. The plurality of flow guide structures 225 in FIG. 8 are connected between the base 224 and the wall surface 222, have an arc shape, and have an inclination angle.

  In addition to the arrangement of the diversion structure at the wind inlet, as shown in FIG. 9, a similar diversion structure 28 is installed at the wind outlet 212, and the number, shape and arrangement of the diversion structures depend on the actual application. , Different choices and changes. In addition, when the concept of the present plan is applied to a reverse hook type centrifugal fan, a bidirectional air intake type blower, or an axial flow fan, as shown in FIG. It can be installed at the same time or at each wind inlet.

  Finally, as shown in FIG. 11, the air volume and wind pressure characteristics of a preferred embodiment of the centrifugal fan of the present invention (shown in FIGS. 2 to 4) and a known blower (shown in FIG. 1) were compared. As can be seen from the figure, the centrifugal fan of the present invention can greatly improve the wind pressure and the air volume of the fan by the design of the flow guiding structure and the air collecting path.

  In summary, the present invention divides the space in the fan frame into the air collecting path or the air storage tank by the wall surface extending from the inner edge of the wind inlet and the convex edge thereof, and the air passes through the fan blade. The pressurization process is lengthened and the rapid change of the wind pressure is prevented, and the installation of the flow guide structure achieves the effect of increasing the airflow and greatly improves the heat dissipation effect.

  In the present invention, preferred embodiments have been disclosed as described above. However, the present invention is not limited to the present invention, and any person who is familiar with the technology can use various methods within the spirit and scope of the present invention. Therefore, the protection scope of the present invention is based on the content specified in the claims.

It is a disassembled perspective view of a well-known blower. It is a disassembled perspective view of the 1st Example of the heat dissipation apparatus of this invention. It is sectional drawing of the centrifugal fan of FIG. It is a perspective view after the combination of the centrifugal fan of FIG. It is a figure which shows the various Example of the change design of the flow guide structure in the centrifugal fan of this invention. It is a figure which shows the various Example of the change design of the flow guide structure in the centrifugal fan of this invention. It is a figure which shows the various Example of the change design of the flow guide structure in the centrifugal fan of this invention. It is a figure which shows the various Example of the change design of the flow guide structure in the centrifugal fan of this invention. It is a perspective view of another Example of the centrifugal fan of this invention. It is a perspective view of another example of the centrifugal fan of the present invention. It is a comparison figure of the 1st Example of the centrifugal fan of this invention, and the air volume and wind pressure characteristic of a well-known air blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Outer frame 11 ... Motor 12 ... Fan blade structure 13 ... Upper lid 101 ... Opening 102 ... Base 131 ... Circular opening 121 ... Hub 122 ... Ring-shaped plate 123 ... Blade 21 ... First fan frame 22 ... Second fan frame 23 ... Drive Apparatus 24 ... Iron housing 25 ... Rotor blade 211 ... Sleeve base 231, 232 ... Bearing 27 ... Rotating shaft 221 ... Air inlet 222 ... Wall surface 26 ... Air collecting passage 212 ... Air outlet 223 ... Ring 252 ... Bottom plate 253 ... First blade Unit 254 ... second blade unit 224 ... base 225, 28 ... conducting structure 29 ... axially directed compression air passages 225a to 225c ... first to third guiding structures

Claims (15)

A heat dissipation device,
A fan frame having at least one wind inlet and at least one wind outlet;
At least one rotor blade installed in the fan frame, having at least one blade unit, and having at least one wall extending from the wind inlet and a plurality of flow guide structures;
Consists of
The heat dissipating device is characterized in that the wind pressure of the heat dissipating device is increased to improve the stability. The fan frame includes a first frame and a second fan frame, the first frame includes a bottom seat that contacts the rotor blade, and the at least one air inlet is formed on the second frame. The heat dissipating device according to claim 1. The heat dissipating apparatus according to claim 2, wherein the wall surface extends into the frame and divides the space in the frame to define a current collecting path. One end of the wall surface has a convex edge, defines an inlet of the air collecting passage, and the at least one blade unit extends in a radial direction toward the vicinity of the inlet of the air collecting passage. The heat dissipation device according to claim 3. The altitude of the air collecting passage and the flow height passing through the rotor blades and the guiding flow partially or completely overlap, and the cross sectional area of the air collecting passage is substantially equal to the cross sectional area of the air outlet. The heat dissipating apparatus according to claim 3. A base is further installed in the wind inlet of the second frame, and the plurality of flow guide structures are installed between the base and the wall surface to increase the wind pressure of the heat dissipation device. Item 4. The heat dissipation device according to Item 3. The plurality of flow guiding structures are connected to the surface of the base or the wall surface, and the shape thereof is a rectangle, a flat plate shape, a curved shape, or a wing shape. Heat dissipation device. A part of the first diversion structure of the plurality of diversion structures is connected between the base and the wall surface, and a part of the second diversion structure is connected to the base and the wall surface at both ends, respectively. The heat dissipating apparatus according to claim 7, wherein the intermediate portion is discontinuous and forms a free end. A part of the first diversion structure of the plurality of diversion structures is connected between the base and the wall surface, a part of the second diversion structure is connected to the wall surface, and the other end is a free end. The part of the third flow structure has one end connected to the base, and the other end is a free end. 3. The base according to claim 2, wherein the bottom seat has a sleeve base for receiving a bearing, and a bearing is further provided inside the base of the second frame to jointly support a transfer shaft of the rotor blade. Heat dissipation device. The rotor blade further includes an annulus, a bottom plate, and a rotating shaft, and the at least one blade unit extends downward from an outer periphery of the annulus to the bottom plate surface. The heat dissipation device according to claim 1. The heat dissipating apparatus according to claim 1, wherein the fan frame has an axial compression type air passage. The heat dissipation device according to claim 1, wherein the heat dissipation device is provided with another set of flow guide structures at the at least one air outlet. The heat dissipating apparatus according to claim 1, further comprising a driving device, fitted on the sleeve of the bottom seat, and coupled to the rotor blade to drive the rotor blade. A heat dissipation device,
A fan frame having at least one opening;
At least one rotor blade installed in the fan frame, having at least one blade unit, and having a plurality of flow guide structures in the at least one opening;
Consists of
A heat dissipation device for increasing the wind pressure of the heat dissipation device.

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