CN1721710A - heat sink - Google Patents

Abstract

The invention provides a heat dissipation device with a double-sided motor fixing design, which comprises a fan frame, a first motor, a second motor and a fan, wherein the fan frame is provided with a first frame and a second frame; and a movable blade part arranged in the fan frame, wherein the first frame is provided with a sleeve seat for accommodating a first bearing, and the second frame is provided with a base part for accommodating a second bearing so as to jointly support and fix a rotating shaft of the movable blade part.

Description

heat sink

technical field

The invention relates to a heat dissipation device, in particular to a high-pressure centrifugal fan with double-sided motor fixing design.

Background technique

Generally, an existing air blower, as shown in FIG. 1A , includes an outer frame 10, a motor 11, a fan blade structure 12 and an upper cover 13, wherein the outer frame 10 has an opening 101 as an air outlet of the air 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 fan blade structure 12 further includes a hub 121 , an annular plate 122 and a plurality of blades 123 disposed thereon.

In the general traditional blower design, the motor is fixed on one side, as shown in FIG. 1B and FIG. 1C . In Fig. 1B, it utilizes a single bearing 14 to fix and support the rotating shaft 15, and the bearing 14 is arranged in the base 102; while in Fig. 1C, it utilizes two bearings 141, 142 to be arranged in the base 102 to fix and support the rotating shaft 15. However, when applied to a high-pressure centrifugal fan, such a design is prone to instability, which makes the vibration more serious.

Contents of the invention

The main purpose of the present invention is to provide a heat dissipation device using a bidirectional fixed motor design.

Another object of the present invention is to provide a high-pressure centrifugal fan designed with a two-way fixed motor to provide stability during high-speed operation and reduce vibration.

According to the idea of the present invention, the heat dissipation device includes a fan frame with a first frame and a second frame; and a moving blade part arranged in the fan frame, wherein the first frame has a sleeve seat for A first bearing is accommodated, and the second frame has a base for accommodating a second bearing to jointly support and fix a rotating shaft of the rotor blade.

Preferably, the moving blade part has a bottom plate, a ring part and a first blade set. The first vane set extends downward from the periphery of the ring portion to the surface of the bottom plate. The moving blade part also includes a second blade group, which is arranged on the surface of the bottom plate, wherein the first blade group and the second blade group are arranged vertically or left and right in a staggered arrangement. The number, shape or size, outer diameter or height of the blades of the first blade group and the second blade group may be the same or different. However, the first blade set and the second blade set may be connected to each other, partially connected or not connected at all. The first blade set and the second blade set can be arranged on the same side of the moving blade part or on different sides of the moving blade part.

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

In addition, the fan frame has at least one air inlet formed on the second frame. The inner edge of the air inlet has a wall, which extends toward the inside of the fan frame to divide the space in the fan frame to define an air-collecting channel, and one end of the wall has a flange to define the air-collecting channel. the inlet, and the moving blade part has a blade set that extends radially toward the inlet of the collector flow channel. Wherein, the height of the air-collecting channel and the channel flowing through the moving blade partially or completely overlap, and the cross-sectional area of the air-collecting channel is substantially equal to the cross-sectional area of an air outlet of the fan frame.

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. The plurality of flow guide structures have an inclination angle, and their shapes may be similar to the shape of the blades of the rotor blade.

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 .

In addition, the fan frame has at least one air outlet and is provided with a guide structure. Furthermore, there is an axial compression air duct inside the fan frame.

The cooling device can be a one-way air-inlet blower, an upside-down centrifugal fan, a two-way air-inlet blower or an axial flow fan.

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

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

Description of drawings

Fig. 1A is a three-dimensional exploded view of an existing blower;

Fig. 1B is the sectional view of the first kind of existing blower;

Fig. 1 C is the sectional view of the second kind 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 .

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 received and coupled in the rotor blade portion 25 to drive the rotor blade portion. 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 rotor blade 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 portion 25 is composed of a ring portion 251, a bottom plate 252, a first blade group 253 and a second blade group 254, and the first blade group 253 and the second blade group 254 are formed by a plurality of blades. Composition, wherein the first vane set 253 extends downward from the periphery of the ring portion 251 to the surface of the bottom plate 252 . The first vane set 253 and the second vane set 254 can be arranged in a staggered arrangement, as shown in FIG. 2A .

Of course, the size, shape and arrangement of the first blade set 253 and the second blade set 254 include but are not limited to having two blade set designs as shown in FIG. There may be at least two designs of blade sets. The number, shape and size of the blades of various blade groups can be the same or different, and the outer diameter and height of each blade can be the same or different. In terms of arrangement, the blade groups in the composite fan blade structure can be connected to each other, partially connected or not connected at all, and each blade group can be arranged on the same side or opposite sides of the moving blade part. The ring portion, the bottom plate, the first vane set and the second vane set can be integrally formed by injection molding. Alternatively, the bottom plate and the first blade set are integrally injection-molded first, and the ring portion and the second blade set are also integrally injection-molded first, and finally the two are combined into a complete moving blade portion. Therefore, any changes and modified designs still do not depart from the patent scope of the present invention.

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 in from the air inlet 221, passes through the first blade set 253 and the second blade set 254 of the moving blade part, and passes through the inlet 261 of the air collecting channel 26. Guided into the air-collecting channel 26 for pressurization and storage to avoid rapid changes in wind pressure, and then discharge high-pressure air 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 portion 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 be thinned. 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. 2B, in addition to placing a first bearing 231 in the sleeve seat 211, a second bearing is also provided inside the base 224 of the second frame 22. 232 to jointly support the rotating shaft 27 of the moving blade portion 25, so as to provide the stability of the high-speed operation of the fan and reduce the occurrence of vibration. Of course, the used bearings may be ball bearings or sleeve bearings. In addition, the present invention also adopts the axial compression air duct 29 design, as shown in FIG. 2C .

In addition to the above-mentioned way that the air guide structure is arranged at the air inlet, a similar air guide structure can also be additionally arranged at the air outlet, and the number, shape and arrangement of the air guide structures can be used in different ways according to actual applications. Choice and Variation. 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.

Based on the above, the present invention provides a heat dissipation device designed with a bidirectional fixed motor, especially for a high-pressure centrifugal fan, so as to provide stability during high-speed operation and reduce vibration.

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

Claims (18)

1. A cooling device comprising: a frame having a first frame and a second frame; and A moving blade part is arranged in the fan frame, wherein the first frame has a sleeve seat for accommodating a first bearing, and the second frame has a base for accommodating a second bearing for common support A rotating shaft of the rotor blade is fixed. 2. The heat dissipation device as claimed in claim 1, wherein the rotor blade portion has a bottom plate, a ring portion and a first blade set. 3. The heat sink as claimed in claim 2, wherein the first blade set extends downward from the periphery of the ring portion to the surface of the bottom plate. 4. The heat dissipation device as claimed in claim 2, wherein the moving blade part further comprises a second blade set disposed on the surface of the bottom plate. 5. The heat sink as claimed in claim 4, wherein the number, shape or size, outer diameter or height of the blades of the first blade set and the second blade set may be the same or different. 6. The heat sink as claimed in claim 4, wherein the first blade set and the second blade set are connected to each other, partially connected or not connected at all. 7. The heat dissipation device as claimed in claim 4, wherein the first blade set and the second blade set are arranged on the same side of the moving blade part or are located on different sides of the moving blade part. 8. The heat dissipation device according to claim 4, wherein the ring portion, the base plate, the first blade set and the second blade set can be made by integral injection molding; or the base plate and the first blade set are first integrated Injection molding and the ring portion and the second blade group are also integrally injection molded and then combined into a complete moving blade portion. 9. The heat dissipation device according to claim 1, wherein the fan frame has at least one air inlet formed on the second frame, and the inner edge of the air inlet has a wall surface, which extends to the inside of the fan frame and the fan frame The inner space is divided to define a collection channel. 10. The heat dissipation device as claimed in claim 9, wherein one end of the wall has a flange to define the inlet of the air collecting channel, and the moving blade part has a blade set towards the vicinity of the inlet of the air collecting channel and extend radially. 11. The heat dissipation device as claimed in claim 9, wherein the height of the air collecting passage and the flow passage passing through the rotor blade partially or completely overlap, and the cross-sectional area of the air collecting passage is substantially equal to that of the fan The cross-sectional area of an air outlet of the frame. 12. The heat dissipation device according to claim 9, wherein a base is further provided in the air inlet of the second frame, and a plurality of air guiding structures are arranged between the base and the wall to improve the heat dissipation of the heat dissipation device. wind pressure. 13. The heat dissipation device according to claim 12, wherein the plurality of flow guide structures are connected and fixed to the base or the wall, and the plurality of flow guide structures are strip-shaped, flat plate-shaped, curved arc-shaped or wing-shaped structures. 14. The heat dissipation device according to claim 12, wherein 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. 15. The heat dissipation device according to claim 12, wherein the plurality of flow guiding structures are partly connected between the base and the wall, partly have one end connected to the wall and the other end is a free end, and the other part is connected at one end at the base and the other end is a free end. 16. The heat dissipation device according to claim 1, wherein the fan frame has at least one air outlet and is provided with a flow guide structure. 17. The heat dissipation device according to claim 1, wherein an axial compression air duct is provided in the fan frame. 18 . The heat dissipation device according to claim 1 , further comprising a driving device sleeved on a sleeve seat of the base and coupled in the moving blade portion for driving the moving blade portion. 19 .

Images