CN1721708A - heat sink - Google Patents

Abstract

The invention provides a heat dissipation device with a composite fan blade design, which comprises a fan frame, a fan blade and a fan blade, wherein the fan frame is provided with at least one air inlet and at least one air outlet; and at least one movable blade part arranged in the fan frame and provided with a bottom plate, a ring part, a first blade group and a second blade group, wherein the first blade group is arranged on the periphery of the ring part, and the second blade group is arranged on the bottom plate.

Description

heat sink

technical field

The invention relates to a heat dissipation device, in particular to a high-pressure centrifugal fan designed with composite fan blades.

Background technique

Generally existing blower, as shown in Figure 1, it comprises an outer frame 10, a motor 11, a blade structure 12 and a loam cake 13, wherein this outer frame 10 has an opening 101, as the air outlet of blower, The motor 11 is set on the base 102 of the outer frame 10 to rotate the blade structure 12 . The upper cover 13 has a circular opening 131 for the air inlet of the blower. The blade structure 12 further includes a hub 121 , an annular plate 122 and a plurality of blades 123 disposed on the upper and lower sides thereof. However, in the traditional blower design, the blades 123 of the fan blade structure 12 are all arranged in the same outer diameter and equal height, which will limit the design of the blower flow channel and the way of matching it.

Contents of the invention

The main purpose of the present invention is to provide a heat dissipation device using a composite fan blade design.

Another object of the present invention is to provide a centrifugal fan with compound fan blade design, which can increase its fluid performance and further achieve the characteristic of increasing wind pressure.

According to a conception of the present invention, the heat dissipation device includes a fan frame with at least one air inlet and at least one air outlet; A set of fan blades and a second set of fan blades, wherein the first set of fan blades is arranged on the periphery of the ring portion, and the second set of fan blades is arranged on the bottom plate.

Wherein, the first fan blade group extends downward from the periphery of the ring portion to the surface of the bottom plate, and the first fan blade group and the second fan blade group are arranged in a staggered arrangement up and down or left and right. The number, shape or size of the blades of the first blade set and the second blade set may be the same or different. The first blade set and the second blade set are curved. Alternatively, each blade of the first fan blade group has a wing-like structure, and each blade of the second fan blade group has a curved arc-shaped structure with unequal heights. .

Preferably, the first blade set and the second blade set are connected to each other, partially connected or not connected at all. The first blade set and the second blade set are arranged on the same side of the moving blade part or on opposite sides of the moving blade part.

Preferably, the ring portion, the bottom plate, the first fan blade set and the second fan blade set can be made by integral injection molding. Alternatively, the bottom plate and the first fan blade group are integrally injection molded, and the ring part and the second fan blade group are integrally injection molded to form a complete rotor blade.

The fan frame has a first frame and a second frame, wherein the first frame has a base for receiving the rotor blade, and the at least one air inlet is formed on the second frame. Wherein, the second frame has a wall surface extending toward the inside of the fan frame to divide the space in the fan frame to define an air collecting channel. One end of the wall has a flange to define the inlet of the air-collecting channel, and the second fan blade group extends horizontally and radially toward the inlet of the air-collecting channel. The height of the air-collecting channel is partially or completely overlapped with the height of the channel flowing through the moving blade, and the cross-sectional area of the air-collecting channel is substantially equal to the cross-sectional area of the air outlet.

In addition, a base is provided in the air inlet of the second frame, and a plurality of air guide structures are arranged between the base and the wall to increase the wind pressure of the heat sink, wherein the plurality of air guide structures are connected to fixed to the base or the wall. The plurality of flow guiding structures may be strip-shaped, flat-plate-shaped, curved-arc-shaped or wing-shaped.

Preferably, the plurality of flow guiding structures are partly connected between the base and the wall, and the other part is connected to the base and the wall at two ends respectively, and the middle part is discontinuous to form a free end.

More preferably, the plurality of flow guiding structures are partly connected between the base and the wall, partly one end is connected to the wall and the other end is a free end, and the other part is one end connected to the base and the other end is a free end .

The plurality of flow guiding structures have an inclination angle, and their shapes may be similar to the shape of the blades of the fan blade group of the moving blade part.

In addition, the fan frame has a sleeve seat for accommodating a bearing, and another bearing is provided inside the base of the second frame to jointly support a rotating shaft of the rotor blade.

Furthermore, there is an axial compression air duct inside the fan frame.

Preferably, the cooling device may be a one-way air-intake blower, an upside-down centrifugal fan, a two-way air-inlet blower or an axial fan.

In addition, the heat dissipation device may additionally be provided with a flow guiding structure at the at least one air outlet.

In addition, the heat dissipation device also includes a driving device, which is sleeved on a sleeve seat of the fan frame and coupled in the moving blade part for driving the moving blade part.

According to another conception of the present invention, the heat dissipation device includes a fan frame with at least one opening; and at least one moving blade part disposed in the fan frame, wherein each moving blade part has at least one fan blade group, and one group Each blade of the fan blade set has a different blade edge height.

The present invention can be further understood through the following drawings and detailed description.

Description of drawings

Fig. 1 is the three-dimensional exploded view of existing blower;

FIG. 2A is an exploded perspective view of a preferred embodiment of the heat sink of the present invention;

2B is a cross-sectional view of the heat sink shown in FIG. 2A;

FIG. 2C is a perspective view of the assembled heat sink shown in FIG. 2A;

3A is a perspective view of another composite fan blade design used in the heat dissipation device of the present invention;

FIG. 3B is a perspective view of yet another composite fan blade design used in the heat dissipation device of the present invention;

4 is a perspective view of another preferred embodiment of the heat sink of the present invention;

Fig. 5 is a comparison chart of the air volume and air pressure characteristics of the compound fan blade design in the heat dissipation device of the present invention and the existing blower.

Detailed ways

Please refer to FIG. 2A to FIG. 2C , which show a first preferred embodiment of the heat dissipation device of the present invention. In this embodiment, a centrifugal fan is taken as an example, but the design method can also be applied to an axial fan. The centrifugal fan is a one-way blower, which mainly includes a first frame 21 , a second frame 22 , a driving device 23 , an iron shell 24 and a rotor blade 25 . The first frame 21 has a socket seat 211 on which the driving device 23 can be placed, and a bearing 231 is placed in the socket seat 211 to support the rotating shaft 27 of the rotor blade portion 25 . The second frame 22 has an air inlet 221 and a wall 222 extending downward from the inner edge of the air inlet. When the second frame 22 is combined with the first frame 21, the second frame 22 The space formed after being combined with the first frame 21 is separated to define an air collecting channel 26 and a space for accommodating the moving blade portion 25 , and also forms an air outlet 212 . The bottom end of the wall has a radially outwardly extending flange 223 for defining an inlet 261 of the flow collecting channel.

The moving blade part 25 is driven by the driving device 23, and is composed of a ring part 251, a bottom plate 252, a first fan blade group 253 and a second fan blade group 254, the first fan blade group 253 and the second fan blade group 254 are all made up of a plurality of blades, wherein the first fan blade group 253 extends downward from the periphery of the ring portion 251 to the surface of the bottom plate 252, and the second fan blade group 254 is set on the bottom plate 252 . The first blade set 253 and the second blade set 254 may be arranged in a staggered arrangement, as shown in FIG. 2A .

The air inlet of the second frame 22 is also provided with a base 224 , and has a plurality of guide structures 225 disposed between the base 224 and the wall 222 to increase the wind pressure of the centrifugal fan.

When the centrifugal fan is running, the airflow is sucked from the air inlet 221, passes through the first fan blade set 253 and the second fan blade set 254 of the moving blade, and passes through the inlet of the air collecting channel 26. 261 to guide into the air-collecting channel 26 for pressurization and gas storage to avoid rapid changes in wind pressure, and then discharge high-pressure airflow from the air outlet 212.

In this embodiment, the wall surface extending downward at the edge of the air inlet of the centrifugal fan is used to separate the air collecting channel 26 and the moving blade part 25, leaving only a small air outlet to allow the air to flow through the moving blade. The pressurization process of the internal air flow becomes longer, and rapid changes in pressure can be avoided. In the axial direction of the moving blade part, the height of the flow collecting channel and the flow channel flowing through the moving blade part and the guide structure can partially or completely overlap, so that the centrifugal fan can achieve the purpose of thinning. The cross-sectional area of the air-collecting channel 26 is substantially equal to the cross-sectional area of the air outlet 212 , thereby avoiding the reduction of the working efficiency due to the change of the air flow area.

In addition, the present invention adopts a two-way motor fixing design. As shown in FIG. 2C, in addition to placing a bearing 231 in the sleeve seat 211, another bearing 232 is provided inside the base 224 of the second frame 22 to jointly The rotating shaft 27 supporting the rotor blade portion 25 provides the stability of the high-speed operation of the fan and reduces vibration. In addition, the present invention also adopts the axial compression air duct 29 design, as shown in FIG. 2C .

Of course, the size, shape and arrangement of the first fan blade set 253 and the second fan blade set 254 include but are not limited to the design of two fan blade sets as shown in FIG. 2A . The design can also have at least two blade designs of more than two blade sets. The number, shape and size of blades of various fan blade groups can be the same or different. In terms of arrangement, the blade groups in the compound fan blades can be connected to each other, partially connected or not connected at all, and the blade groups can be arranged on the same side or opposite sides of the moving blade part. For example, please refer to FIG. 3A , the first blade set 353 and the second blade set 354 can be arranged up and down, and the first blade set 353 is arranged around the ring portion 351 in a wing-like structure; and The second fan blade set 354 is arranged around the surface of the bottom plate 352 , and each blade presents a curved structure with different heights, that is, each blade has a different blade edge height. The size, shape and number of blades of the first blade set 353 and the second blade set 354 are different. The ring portion 351 , the bottom plate 352 , the first fan blade set 353 and the second fan blade set 354 can be integrally formed by injection molding. Alternatively, the bottom plate 352 and the first fan blade set 353 are integrally injection molded first, and the ring portion 351 and the second fan blade set 354 are also integrally injection molded first, and finally the two are combined into a complete rotor blade. In addition, the composite fan blade design of the present invention can also be shown in FIG. 3B , the first fan blade set 353 and the second fan blade set 354 are connected to each other, and both are in a curved shape, and the bending direction presents a opposite direction. However, any changes and modified designs still do not depart from the patent scope of the present invention.

In addition to the above-mentioned way that the air guide structure is arranged at the air inlet, a similar air guide structure 28 can also be additionally arranged at the air outlet 212, as shown in Figure 4, which is a curved structure, and the individual air guide structures Number, shape and arrangement can be used as different choices and changes according to actual applications. In addition, if the concept of the present invention is applied to an upside-down centrifugal fan, a two-way air-inlet blower or an axial-flow fan, the air guide structure can be arranged at one of the air inlets, or at each air inlet at the same time place, and two rotor blades can be set inside it.

Finally, please refer to Fig. 5, which is a comparison chart of the air volume and air pressure characteristics of the first preferred embodiment of the heat sink of the present invention (i.e. shown in Fig. 2A to Fig. 2C) and the existing blower (i.e. Fig. 1), thus The figure clearly shows that the heat sink of the present invention can increase its fluid performance through the design of composite fan blades, and greatly increase the air pressure and air volume of the heat sink.

Based on the above, the present invention provides a heat dissipation device with a composite fan blade design, which can increase its fluid performance, and further achieve the characteristic of increasing wind pressure, so as to greatly improve heat dissipation efficiency.

Therefore, the present invention can be modified in any way by those skilled in the art without departing from the protection scope of the appended claims.

Claims (19)

1. sink, it comprises:

One fan frame has at least one wind inlet and at least one exhaust outlet; And

At least one movable vane portion is arranged in this fan frame, and it has a base plate, a ring portion, one first flabellum group and one second flabellum group, and wherein this first flabellum group is arranged at the periphery of this ring portion, and this second flabellum group is arranged on this base plate.

2. sink as claimed in claim 1, wherein this first flabellum group is to extend downward this backplate surface from the periphery of this ring portion.

3. sink as claimed in claim 1, wherein the number of blade, shape or the size of this first flabellum group and the second flabellum group can be identical or different.

4. sink as claimed in claim 1, wherein this first flabellum group is interconnected with one another with the second flabellum group, partly is connected or does not connect fully.

5. sink as claimed in claim 1, the wherein same opposition side of listing in the same side of this movable vane portion or being positioned at this movable vane portion of this first flabellum group and the second flabellum group.

6. sink as claimed in claim 1, wherein this ring portion, this base plate, this first flabellum group and the second flabellum group can the integrated injection molding mode be made; Perhaps this base plate and this first flabellum group earlier also are combined into a complete movable vane portion for behind the integrated injection molding for this ring portion of integrated injection molding and the second flabellum group.

7. sink as claimed in claim 1, wherein each blade of this first flabellum group is wings, and every blade of this second flabellum group presents not contour bent arc curved shape structure.

8. sink as claimed in claim 1, wherein this fan frame has one first framework and one second framework, wherein this first framework has a base, in order to accept this movable vane portion, and this at least one wind inlet is formed on this second framework, it is the separated by spaces that will fan to inner extension of this fan frame in the frame that this second framework has a wall, to limit a gas collection runner.

9. sink as claimed in claim 8, wherein an end of this wall has a flange, and limiting the inlet of this gas collection runner, this second flabellum group is near the ingress of this gas collection runner and be radially and extend.

10. sink as claimed in claim 8, wherein the runner height of the height of this gas collection runner and this movable vane portion that flows through is for overlapping partially or completely, and the sectional area of this gas collection runner is equal to the sectional area of this exhaust outlet in fact.

11. sink as claimed in claim 8 wherein also is provided with a base portion in the wind inlet of this second framework, and has a plurality of flow guide structures and be arranged between this base portion and this wall, in order to improve the blast of this sink.

12. sink as claimed in claim 11, wherein these a plurality of flow guide structures are connected and fixed on this base portion or this wall, and these a plurality of flow guide structures are strip, flat tabular, arc shape or wing structure.

13. sink as claimed in claim 11, wherein these a plurality of flow guide structures partly are connected between this base portion and this wall, and another part then is connected to this base portion for two ends and this wall intermediate portion is divided into the discontinuous free end that forms.

14. sink as claimed in claim 11, wherein these a plurality of flow guide structures are that part is connected between this base portion and this wall, part is that an end is connected in this wall and the other end is a free end, and another part is that an end is connected in this base portion and the other end is a free end.

15. sink as claimed in claim 8, wherein this fan frame has a receiver, and in order to a ccontaining bearing, and the base portion inboard of this second framework is established a bearing in addition, with a rotating shaft of this movable vane portion of together support.

16. sink as claimed in claim 1 wherein has an axial compression formula air channel in this fan frame.

17. sink as claimed in claim 1, wherein this sink is provided with a flow guide structure in this at least one exhaust outlet place.

18. sink as claimed in claim 1, it also comprises a drive unit, be socketed on the receiver of this fan frame and coupling in this movable vane portion, in order to drive this movable vane portion.

19. a sink, it comprises:

One fan frame has at least one opening; And

At least one movable vane portion is arranged in this fan frame, and wherein each movable vane portion has at least one flabellum group, and wherein each blade of one group of flabellum group has different leaf margin height.

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