CENTRIFUGAL FAN IMPELLER STRUCTURE

Abstract

A centrifugal fan impeller structure includes a hub and a second annular body. The hub has an extension section. A first annular body is connected to a free end of the extension section. The first annular body has a first side and a second side. A first blade set is disposed on the first side. The second annular body has a third side and a fourth side. A second blade set is disposed on the third side. The fourth side is mated and connected with the second side. The centrifugal fan impeller structure is able to greatly increase air volume and wind pressure of the fan. Moreover, in operation, the centrifugal fan impeller structure makes less noise.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a centrifugal fan impeller structure, and more particularly to a centrifugal fan impeller structure with double layers of blades for enhancing flow guide effect and increasing wind pressure of the fan. Moreover, in operation, the centrifugal fan impeller structure makes less noise.

2. Description of the Related Art

Following the rapid development of electronic industries, the performances of electronic components have been continuously enhanced. When operating at high speed, the electronic components generate high heat. It is necessary to efficiently dissipate the heat. Otherwise, the temperature will rise very quickly to deteriorate the performances of the electronic components or even cause burnout of the electronic components. In general, a miniaturized centrifugal fan is mounted in a limited space of the system for dissipating the heat generated by the electronic components. The centrifugal fan mainly includes a frame body, a fan hub and multiple fan blades annularly arranged along outer circumference of the fan hub. The frame body has two wind inlets on upper and lower sides and a wind outlet on a lateral side. In operation, the fan blades rotate to drive and flow the ambient air. The axial airflow coming in from the wind inlet will turn to radial airflow, which is exhausted from the wind outlet of the frame body.

At current stage, some manufacturers try to change the configuration of the fan blades for achieving greater wind pressure and air volume. However, only limited effect is achieved by such change so that the requirements of users are still unfulfilled. This is because the frame body is quite narrow and it is hard to vary the configuration or structural design of the fan blades in such a narrow space. Therefore, the conventional centrifugal fan has the following shortcomings:

1. The structural design is limited.

2. It is hard to increase the wind pressure.

3. The flow guide effect is poor.

SUMMARY OF THE INVENTION

A primary object of the present invention is to provide a centrifugal fan impeller structure, which is able to two-way increase air volume and wind pressure of the fan.

A further object of the present invention is to provide the above centrifugal fan impeller structure, which can be selectively assembled in different forms to change the angle of the blades.

To achieve the above and other objects, the centrifugal fan impeller structure of the present invention includes a hub and a second annular body.

The hub has an extension section. A first annular body is connected to a free end of the extension section. The first annular body has a first side and a second side. A first blade set is disposed on the first side. The first blade set includes multiple first blade bodies.

The second annular body has a third side and a fourth side. A second blade set is disposed on the third side. The second blade set includes multiple second blade bodies. The fourth side is mated and connected with the second side.

The centrifugal fan impeller structure is able to two-way increase air volume and wind pressure of the fan to enhance flow guide effect of the fan as a whole. Moreover, in operation, the centrifugal fan impeller structure makes less noise. Accordingly, the present invention has the following advantages:

1. The present invention has better flow guide effect.

2. The present invention is able to increase wind pressure.

3. In operation, the present invention makes less noise.

4. The relative inclination of the first and second blade sets is customizedly adjustable.

BRIEF DESCRIPTION OF THE DRAWINGS

The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein:

FIG. 1 is a perspective exploded view of a first embodiment of the centrifugal fan impeller structure of the present invention;

FIG. 2 is a perspective assembled view of the first embodiment of the centrifugal fan impeller structure of the present invention;

FIG. 3 is a top view of a second embodiment of the centrifugal fan impeller structure of the present invention;

FIG. 4 is a top view of a third embodiment of the centrifugal fan impeller structure of the present invention;

FIG. 5 is a side view of a fourth embodiment of the centrifugal fan impeller structure of the present invention;

FIG. 6 is a side view of a fifth embodiment of the centrifugal fan impeller structure of the present invention;

FIG. 7 is a top view of a sixth embodiment of the centrifugal fan impeller structure of the present invention;

FIG. 8 is a top view of a seventh embodiment of the centrifugal fan impeller structure of the present invention; and

FIG. 9 is a perspective exploded view of an eighth embodiment of the centrifugal fan impeller structure of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 and 2. FIG. 1 is a perspective exploded view of a first embodiment of the centrifugal fan impeller structure of the present invention. FIG. 2 is a perspective assembled view of the first embodiment of the centrifugal fan impeller structure of the present invention. According to the first embodiment, the centrifugal fan impeller structure 1 of the present invention includes a hub 11 and a second annular body 12.

The hub 11 has an extension section 111. A first annular body 112 is connected to a free end of the extension section 111. The first annular body 112 has a first side 1121 and a second side 1122. A first blade set 13 is disposed on the first side 1121. The first blade set 13 includes multiple first blade bodies 131.

The second annular body 12 has a third side 121 and a fourth side 122. A second blade set 14 is disposed on the third side 121. The second blade set 14 includes multiple second blade bodies 141. The fourth side 122 is mated and connected with the second side 1122.

Each first blade body 131 has a first end 1311 and a second end 1312. Each second blade body 141 has a third end 1411 and a fourth end 1412. Each two adjacent first blade bodies 131 define therebetween a first flow way 1313. Each two adjacent second blade bodies 141 define therebetween a second flow way 1413. The number of the first blade bodies 131 is equal to the number of the second blade bodies 141.

Please now refer to FIG. 3, which is a top view of a second embodiment of the centrifugal fan impeller structure of the present invention. The second embodiment is substantially identical to the first embodiment in structure and thus will not be repeatedly described hereinafter. Also referring to FIG. 1, the second embodiment is different from the first embodiment in that the first blade set 13 extends away from the first annular body 112 by a first length and the second blade set 14 extends away from the second annular body 12 by a second length. The first length is shorter than the second length.

Please now refer to FIG. 4, which is a top view of a third embodiment of the centrifugal fan impeller structure of the present invention. The third embodiment is substantially identical to the first embodiment in structure and thus will not be repeatedly described hereinafter. The third embodiment is different from the first embodiment in that the number of the first blade bodies 131 is unequal to the number of the second blade bodies 141. In this embodiment, the number of the first blade bodies 131 is, but not limited to, smaller than the number of the second blade bodies 141 for illustration purposes only.

Please now refer to FIG. 5, which is a side view of a fourth embodiment of the centrifugal fan impeller structure of the present invention. The fourth embodiment is substantially identical to the first embodiment in structure and thus will not be repeatedly described hereinafter. The fourth embodiment is different from the first embodiment in that the height of the second end 1312 of the first blade body 131 is larger than the height of the fourth end 1412 of the second blade body 141.

Please now refer to FIG. 6, which is a side view of a fifth embodiment of the centrifugal fan impeller structure of the present invention. The fifth embodiment is substantially identical to the first embodiment in structure and thus will not be repeatedly described hereinafter. The fifth embodiment is different from the first embodiment in that the height of the fourth end 1412 of the second blade body 141 is larger than the height of the second end 1312 of the first blade body 131.

Please now refer to FIG. 7, which is a top view of a sixth embodiment of the centrifugal fan impeller structure of the present invention. The sixth embodiment is substantially identical to the first embodiment in structure and thus will not be repeatedly described hereinafter. The sixth embodiment is different from the first embodiment in that the first end 1311 of the first blade body 131 is misaligned with the third end 1411 of the second blade body 141. Each two adjacent first blade bodies 131 define therebetween a first flow way 1313. Each two adjacent second blade bodies 141 define therebetween a second flow way 1413. The first flow way 1313 has a first wind inlet end 1313a and a first wind outlet end 1313b. The second flow way 1413 has a second wind inlet end 1413a and a second wind outlet end 1413b. The first wind inlet end 1313a is misaligned with the second wind inlet end 1413a.

Please now refer to FIG. 8, which is a top view of a seventh embodiment of the centrifugal fan impeller structure of the present invention. The seventh embodiment is substantially identical to the first embodiment in structure and thus will not be repeatedly described hereinafter. The seventh embodiment is different from the first embodiment in that the first end 1311 of the first blade body 131 is aligned with the third end 1411 of the second blade body 141. The first flow way 1313 has a first wind inlet end 1313a and a first wind outlet end 1313b. The second flow way 1413 has a second wind inlet end 1413a and a second wind outlet end 1413b. The first wind inlet end 1313a is aligned with the second wind inlet end 1413a.

Please now refer to FIG. 9, which is a perspective exploded view of an eighth embodiment of the centrifugal fan impeller structure of the present invention. The eighth embodiment is substantially identical to the first embodiment in structure and thus will not be repeatedly described hereinafter. Also referring to FIGS. 1, 7 and 8, the eighth embodiment is different from the first embodiment in that the second side 1121 of the first annular body 112 has a reception section 1123. The reception section 1123 includes a first reception socket set 1123a and a second reception socket set 1123b. The fourth side 122 of the second annular body 12 has multiple boss bodies 1221. The boss bodies 1221 can be selectively correspondingly inserted into the first reception socket set 1123a or the second reception socket set 1123b.

By means of the reception section 1123 and the boss bodies 1221, the second annular body 12 can be quickly disassembled from and reassembled with the first annular body 112. Accordingly, the position of the first end 1311 of the first blade body 131 can be quickly changed to align the first end 1311 of the first blade body 131 with the third end 1411 of the second blade body 141 (as shown in FIG. 8) or misalign the first end 1311 of the first blade body 131 with the third end 1411 of the second blade body 141 (as shown in FIG. 7).

The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. It is understood that many changes and modifications of the above embodiments can be made without departing from the spirit of the present invention. The scope of the present invention is limited only by the appended claims.

Claims

1. A centrifugal fan impeller structure comprising:

a hub having an extension section, a first annular body being connected to a free end of the extension section, the first annular body having a first side and a second side, a first blade set being disposed on the first side, the first blade set including multiple first blade bodies;

a second annular body having a third side and a fourth side, a second blade set being disposed on the third side, the second blade set including multiple second blade bodies, the fourth side being mated and connected with the second side.

2. The centrifugal fan impeller structure as claimed in claim 1, wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, each two adjacent first blade bodies defining therebetween a first flow way, each two adjacent second blade bodies defining therebetween a second flow way.

3. The centrifugal fan impeller structure as claimed in claim 1, wherein the first blade set extends away from the first annular body by a first length and the second blade set extends away from the second annular body by a second length, the first length being shorter than the second length.

4. The centrifugal fan impeller structure as claimed in claim 1, wherein the number of the first blade bodies is equal to the number of the second blade bodies.

5. The centrifugal fan impeller structure as claimed in claim 2, wherein the height of the second end of the first blade body is larger than the height of the fourth end of the second blade body.

6. The centrifugal fan impeller structure as claimed in claim 2, wherein the height of the fourth end of the second blade body is larger than the height of the second end of the first blade body.

7. The centrifugal fan impeller structure as claimed in claim 1, wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, the first end of the first blade body being misaligned with the third end of the second blade body, each two adjacent first blade bodies defining therebetween a first flow way, each two adjacent second blade bodies defining therebetween a second flow way, the first flow way having a first wind inlet end and a first wind outlet end, the second flow way having a second wind inlet end and a second wind outlet end, the first wind inlet end being misaligned with the second wind inlet end.

8. The centrifugal fan impeller structure as claimed in claim 1, wherein each first blade body has a first end and a second end and each second blade body has a third end and a fourth end, the first end of the first blade body being aligned with the third end of the second blade body, the first flow way having a first wind inlet end and a first wind outlet end, the second flow way having a second wind inlet end and a second wind outlet end, the first wind inlet end being aligned with the second wind inlet end.

9. The centrifugal fan impeller structure as claimed in claim 1, wherein the second side of the first annular body has a reception section, the reception section including a first reception socket set and a second reception socket set, the fourth side of the second annular body having multiple boss bodies, whereby the boss bodies can be selectively correspondingly inserted into the first reception socket set or the second reception socket set.

10. The centrifugal fan impeller structure as claimed in claim 1, wherein the number of the first blade bodies is unequal to the number of the second blade bodies.