CN1614241A - Centrifugal fan and its frame structure - Google Patents

Abstract

The invention provides a centrifugal fan and a fan frame structure thereof. The centrifugal fan comprises a fan frame, a fan blade and a fan blade, wherein the fan frame is provided with at least one air inlet and one air outlet; and at least one movable blade part arranged in the fan frame and provided with at least one blade group, wherein the inner edge of the at least one air inlet is provided with an extended wall surface, and the wall surface enables the space in the fan frame to form an air collecting flow channel so as to improve the air pressure and the heat dissipation efficiency.

Description

Centrifugal fan and its frame structure

(1) Technical field

The invention relates to a centrifugal fan, in particular to a centrifugal fan capable of increasing wind pressure and its fan frame structure.

(2) Background technology

Generally known air blower, as shown in Figure 1, comprises an outer frame 10, a motor 20 and a blade structure 30, wherein outer frame 10 has an air inlet 11 and an exhaust port (not shown), the motor 20 is sleeved on the base 101 of the outer frame 10 to rotate the blade structure 30 . The blade structure 30 further includes a hub 31 , a bottom plate 32 and a plurality of vanes 33 formed thereon. In this traditional blower design, since the blades are in direct contact with the flow channel, and the upper and lower air gaps of the blades are large, it is difficult to control the direction of the airflow, and it is easy to cause air backflow, resulting in low heat dissipation efficiency.

Therefore, as the efficiency of the electronic components increases, in order to improve the heat dissipation efficiency of the fan, the air flow can be increased by enlarging the flow channel inside the outer frame. However, in a limited space, this approach is not feasible, and it is likely to cause problems such as uneven air volume, noise, and reduced air volume. Another conventional improvement technology is to increase the number and size of the blades, but due to the limited space, it will drive the rotation of the airflow, which will reduce the heat dissipation efficiency of the centrifugal fan itself.

(3) Contents of the invention

The main purpose of the present invention is to provide a centrifugal fan and its fan frame structure, which has the function of greatly increasing the wind pressure.

Another object of the present invention is to provide a centrifugal fan and its fan frame structure, which can lengthen the pressurization process of the air flowing through the fan blades, so as to avoid rapid changes in wind pressure.

According to a conception of the present invention, the centrifugal fan includes a fan frame with at least one air inlet and an air outlet; The inner edge of the air inlet has an extended wall surface, and the wall surface forms an air collecting channel in the space in the fan frame to increase the wind pressure.

Preferably, 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.

The centrifugal fan also includes a driving device sleeved on a sleeve seat of the base to rotate the rotor blade.

Preferably, one end of the wall has a flange to form an inlet of the air-collecting channel. The moving blade part has a first blade group and a second blade group, wherein the first blade group is located near the air inlet of the fan frame, and the second blade group is formed near the inlet of the air collecting channel. Horizontal radial extension. Wherein, the moving blade portion further includes a hub, around which a plurality of blade rings of the blade set are arranged, and one end of the hub has an extension portion, which extends horizontally and radially toward the inlet of the flow collector. The blade group of the at least one moving blade portion extends horizontally and radially along with the extending portion, and guides the air flow into the air collecting channel.

Alternatively, the base of the fan frame has an extended wall surface, and together with the extended wall surface of the air inlet, the inlet of the air collecting channel is formed. The middle part of the blade group of the at least one moving blade section extends horizontally and radially toward the inlet of the air collecting channel, and guides the air flow into the air collecting channel.

Preferably, the wall is formed by two extension walls.

In addition, the centrifugal fan also includes at least one vane portion disposed on the wall or at the at least one air inlet to increase wind pressure. Wherein, the at least one stationary blade portion and the at least one moving blade portion may be alternately arranged up and down. Alternatively, the at least one moving blade part includes a first blade set and a second blade set, which are respectively located on the upper and lower sides of the at least one stationary blade part. The number of the at least one stationary blade and the at least one moving blade can be the same or different.

Preferably, in the axial direction of the moving blade part, the height of the flow collecting channel and the height of the flow channel of the moving and stationary blade partially or completely overlap. Wherein, the cross-sectional area of the air-collecting channel is equal to the cross-sectional area of the air outlet.

Preferably, the blade sets of the at least one moving blade part respectively have a slope on a side close to the air inlet.

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

Preferably, the at least one moving blade part includes a first moving blade part and a second moving blade part, and the two are combined together by means of screwing, buckling, fusing or bonding.

According to another conception of the present invention, the centrifugal fan includes a fan frame with at least one air inlet, an air outlet and at least one stationary blade; The blade part is composed of a plurality of blades. The blade shape of the at least one stationary blade part may be similar to the blade shape of the moving blade part.

In order to further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

(4) Description of drawings

Fig. 1 is an exploded perspective view of a conventional blower.

FIG. 2A is an exploded perspective view of the first preferred embodiment of the centrifugal fan of the present invention.

FIG. 2B is a cross-sectional view of the centrifugal fan shown in FIG. 2A .

FIG. 3 is a cross-sectional view of a second preferred embodiment of the centrifugal fan of the present invention.

FIG. 4 is a cross-sectional view of a third preferred embodiment of the centrifugal fan of the present invention.

FIG. 5 is a sectional view of a fourth preferred embodiment of the centrifugal fan of the present invention.

Fig. 6 is a comparison chart of the air volume and air pressure characteristics of the conventional blower and the centrifugal fan of the present invention.

(5) specific implementation

Please refer to FIGS. 2A and 2B , which show a first preferred embodiment of the centrifugal fan of the present invention. The centrifugal fan is a one-way blower, which mainly includes a first frame 21 , a second frame 22 , a driving device 23 and a moving blade 24 . The first frame 21 has a sleeve seat 211, so that the driving device 23 can be placed on it, and the second frame 22 has an air inlet 221 and a wall 222 extending downward from the inner edge of the air inlet. After the second frame 22 is combined with the first frame 21, the wall surface 222 forms an air collecting channel 25 in the space formed by the combination of the second frame 22 and the first frame 21 and accommodates the moving blade. The space of the part 24 also forms an air outlet 212 at the same time. The bottom end of the wall has a radially outwardly extending flange 223 for forming an inlet 251 of the flow collecting channel. The moving blade part has a first blade group 241 and a second blade group 242, both of which are composed of a plurality of blades, wherein the second blade group 242 is located near the inlet of the collecting channel, and the first blade group 241 is located near the air inlet 221 of the second frame 22 . The moving blade portion 24 is driven by the driving device 23 .

When the centrifugal fan is running, the airflow is sucked in from the air inlet, passes through the first blade set 241 of the moving blade part, and is guided into The air-collecting channel pressurizes and stores air, and then discharges the high-pressure airflow from the air outlet.

The wall surface extending downward at the edge of the air inlet of the centrifugal fan of the present invention is used to separate the air collecting channel and the rotor blade, leaving only a small air outlet, so that the pressurization process of the air flow passing through the rotor blade Longer to avoid rapid changes in pressure. In the axial direction of the moving blade part, the height of the flow collecting channel and the flow channel of the moving and stationary blades can partially or completely overlap, so that the centrifugal fan can be thinned. The cross-sectional area of the air-collecting channel is equal to the cross-sectional area of the air outlet, thereby avoiding the reduction of work efficiency due to the change of the air flow area.

In addition, each blade of the blade set has an inclined surface on the side close to the air inlet, which can increase the working area of the air inlet and increase the air intake volume.

Next, please refer to FIG. 3 , which shows a second preferred embodiment of the centrifugal fan of the present invention. It is substantially similar to the above-mentioned first embodiment, but wherein the moving blade portion 34 only has a blade set 342, and a plurality of blade rings are arranged around the hub 341 of the moving blade portion, and the bottom end of the hub is diameter The extension portion extends horizontally, and the vane set 342 extends downward from near the air inlet of the second frame to near the inlet 351 of the air collecting channel 35 . In addition, the downwardly extending wall is formed by two walls 322, 322', which are used to isolate the flow collector and the rotor blade. The process of pressurizing the air flowing through the moving blades is prolonged by the air-collecting channel 35 , so that rapid changes in wind pressure can be avoided.

Now, please refer to Fig. 4, which shows the third preferred embodiment of the centrifugal fan of the present invention, which is substantially similar to the above-mentioned first embodiment, and it includes two movable blade parts 44, 44', each having a The blade set 442, 442' composed of a plurality of blades, the bottom end of the lower moving blade part 44' extends radially and horizontally toward the entrance 451 of the collector flow channel 45, and the blade set of the lower moving blade part also Then it extends to the inlet 451 of the air collecting channel 45 . In addition, this embodiment also includes a plurality of stationary blades 46 arranged on the wall surface to direct the air flow and increase the wind pressure more effectively, while the blade set 442 of the upper moving blade part 44 and the blade set 442 of the lower moving blade part 44' The blade sets 442 ′ are respectively disposed on the upper and lower sides of the stator blade 46 . When assembling, the lower moving blade part 44' and the second frame 42 are sequentially combined on the first frame 41, and finally, the upper moving blade part 44 is screwed, buckled, fused or bonded. and so on are joined to the lower rotor blade.

In addition to the arrangement of the stationary vanes and moving vanes described above, the stationary vanes can also be arranged on the wall closest to the air inlet, and the moving vanes are arranged under the stationary vanes, that is, along the top-to-bottom line in Figure 4 The direction of the fixed blade and the moving blade are arranged in sequence, and the number of the moving blade part and the fixed blade part and the upper and lower arrangement methods can be used as different choices and changes according to actual applications. For example, if the idea of the present invention is applied to an upside-down centrifugal fan or a two-way air-inlet blower, the vane can also be disposed at another air inlet of the first frame 41 .

In addition, please refer to FIG. 5 , which shows a fourth preferred embodiment of the centrifugal fan of the present invention. It is a two-way air-inlet type blower, and its structure is similar to that of the above-mentioned second embodiment, but the inlet 551 of the air-collecting channel 55 is formed by the wall 522 extending downward from the inner edge of the air inlet of the second frame 52 and A wall surface 513 extending upward from the base of the first frame 51 is jointly formed, the blade group 542 of the moving blade part 54 is arranged around the hub 541 of the moving blade part, and the middle part of the blade group extends horizontally to the The inlet 551 of the air collecting channel 55 . When the outside air is inhaled bidirectionally from the air inlet 511 of the first frame and the air inlet 521 of the second frame, the air is guided to the inlet 551 of the air collecting channel 55 by the blades extending horizontally. In addition, between the wall surface of the first frame 51 and the sleeve seat receiving the driving device, a plurality of stationary blades 56 can also be added, similar to the shape of the blades of the moving blades, to guide the airflow and increase the wind pressure. .

Finally, please refer to FIG. 6 , which is a comparison chart of air volume and air pressure characteristics between the conventional blower shown in FIG. 1 and the centrifugal fan shown in FIG. 3 . From this figure, it can be clearly proved that under the same air volume, the air pressure produced by the centrifugal fan of the present invention is much greater than that of the conventional air blower.

Based on the above, the present invention uses the wall surface and its flange extended from the inner edge of the air inlet to separate the space in the fan frame into a collection flow channel or an air storage tank, so that the air flows through the pressurized air of the fan blades. The process becomes longer to avoid rapid changes in wind pressure, and through the setting of the stator blades, the effect of supercharging is achieved to greatly improve the heat dissipation efficiency.

Although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, and other modifications can be made without departing from the spirit of the present invention. Various equivalent changes and modifications, therefore, as long as the changes and modifications to the above embodiments are within the spirit of the present invention, they will all fall within the scope of the claims of the present invention.

Claims (24)

1. A centrifugal fan, comprising: a frame with at least one air inlet and one air outlet; and At least one moving blade part is arranged in the fan frame, which has at least one blade group, wherein the inner edge of the at least one air inlet has an extended wall surface, and the wall surface forms an air collecting channel in the space in the fan frame, to increase wind pressure. 2. The centrifugal fan according to claim 1, wherein 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 An air inlet is formed on the second frame. 3 . The centrifugal fan according to claim 2 , further comprising a driving device sleeved on a sleeve seat of the base for rotating the rotor blade. 4 . 4. The centrifugal fan as claimed in claim 1, wherein one end of the wall has a flange to form an inlet of the air collecting channel. 5. The centrifugal fan according to claim 4, characterized in that the moving blade part has a first blade set and a second blade set, wherein the first blade set is located near the air inlet of the fan frame, and the The second vane group extends horizontally and radially toward the vicinity of the inlet of the air collecting channel. 6. The centrifugal fan according to claim 1, characterized in that the moving blade part further comprises a hub, a plurality of blade rings of the blade set are arranged around it, and one end of the hub has an extension part toward the hub. The inlet of the air flow channel extends horizontally and radially; the blade group of the at least one moving blade portion extends horizontally and radially along with the extending portion, guiding the air flow into the collecting air channel. 7. The centrifugal fan according to claim 1, wherein the base of the fan frame has an extended wall surface, which together with the extended wall surface of the air inlet forms the inlet of the air collecting channel; the at least The middle part of the blade group of a moving blade section extends horizontally and radially toward the inlet of the air-collecting channel, and guides the airflow into the air-collecting channel. 8. The centrifugal fan as claimed in claim 1, wherein the wall is formed by two extending walls. 9 . The centrifugal fan according to claim 1 , further comprising at least one vane portion disposed on the wall or at the at least one air inlet for increasing air pressure. 10 . 10 . The centrifugal fan according to claim 9 , wherein the at least one stationary blade portion and the at least one moving blade portion are alternately arranged. 11 . 11. The centrifugal fan according to claim 9, wherein the number of the at least one stator blade and the at least one rotor blade can be the same or different. 12 . The centrifugal fan according to claim 9 , wherein in the axial direction of the moving blade part, the height of the collecting flow passage and the flow passage height of the moving and stationary blades partially or completely overlap. 13 . 13. The centrifugal fan according to claim 1, wherein the cross-sectional area of the air-collecting channel is equal to the cross-sectional area of the air outlet. 14 . The centrifugal fan according to claim 1 , wherein the blade sets of the at least one moving blade portion respectively have a slope on a side close to the air inlet. 15 . 15. The centrifugal fan according to claim 1, wherein the at least one moving blade portion comprises a first moving blade portion and a second moving blade portion, both of which are screwed, fastened, fused or bonded combine it all toghther. 16. A centrifugal fan comprising: a frame with at least one air inlet, one air outlet and at least one stationary vane; and At least one moving blade part is arranged in the fan frame, it has at least one moving blade part, and the moving blade part is composed of a plurality of blades. 17. The centrifugal fan as claimed in claim 16, wherein the shape of the blade of the at least one stationary blade part is similar to the shape of the blade of the moving blade part. 18 . The centrifugal fan according to claim 16 , wherein the at least one stationary blade portion and the at least one moving blade portion are alternately arranged. 19. The centrifugal fan according to claim 16, wherein the number of the at least one stator blade and the at least one rotor blade can be the same or different. 20. The centrifugal fan according to claim 16, characterized in that the inner edge of the air inlet has an extended wall surface, and the wall surface makes the space in the fan frame form an air-collecting channel: the at least one vane portion Set on the wall to increase the wind pressure. 21. The centrifugal fan as claimed in claim 20, wherein one end of the wall has a flange to form an inlet of the air collecting channel. 22. The centrifugal fan according to claim 20, characterized in that the moving blade part has a first blade set and a second blade set, wherein the first blade set is located near the air inlet of the fan frame, and the The second vane group extends horizontally and radially toward the vicinity of the inlet of the air collecting channel. 23. The centrifugal fan according to claim 20, characterized in that the moving blade part further comprises a hub, so that a plurality of blade rings of the blade set are arranged around it, and one end of the hub has an extension part toward the The inlet of the air collecting channel extends horizontally and radially; the blade group of the at least one moving blade portion extends horizontally and radially along with the extending portion, and guides the air flow into the air collecting channel. 24. The centrifugal fan according to claim 20, characterized in that the base of the fan frame has an extended wall surface, and the wall surface extended from the air inlet jointly forms the inlet of the air collection channel; the at least The middle part of the blade group of a moving blade section extends horizontally and radially toward the inlet of the air-collecting channel, and guides the airflow into the air-collecting channel.

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