TWM448571U

TWM448571U - Centrifugal fan blade structure

Info

Publication number: TWM448571U
Application number: TW101220072U
Authority: TW
Inventors: Zhi-Wei Yang; Sheng-Pi Li
Original assignee: Asia Vital Components Co Ltd
Priority date: 2012-10-18
Filing date: 2012-10-18
Publication date: 2013-03-11

Description

Centrifugal fan blade structure

一種離心扇葉結構，尤指一種可降低離心式風扇運轉時之噪音的離心扇葉結構。
A centrifugal fan blade structure, especially a centrifugal fan blade structure capable of reducing noise during operation of a centrifugal fan.

現行電子產業迅速發展，電子元件之性能不斷提升，隨著運算速度越快其所產生之熱量則會相對產生較大之熱量，若無法將該熱量即時排出解熱，則該電子元件運算效能則會降低，嚴重者則會造成燒毀，故在有限的系統空間中透過小型之離心風扇作為解熱使用，該離心風扇主要包含有一框體、一風扇輪轂、以及環設於該風扇輪轂外部的複數扇葉體，該框體其上方及下方分別各具有一進風口，其側邊具有一出風口，當運轉時則透過該等扇葉體旋轉帶動周圍空氣流動，將從進風口進入之軸向器流轉向沿該風扇輪轂之徑向氣流後由出風口排出。
離心風扇運轉時，因葉輪所流出不均勻尾流(non-uniform wake)跟舌尖的交互作用將產生噪音，並當葉輪和舌尖的間隙比較窄時，噪音受到尾流在舌尖的衝擊以及舌尖附近的壓力差造成得舌尖震盪tongue oscillations)影響，當間隙達到葉輪半徑的20％時，主要的噪音源只剩尾流的影響，而且很小。另外在葉輪葉片間增加端的葉片（Short vane）可以減少尾流的強度，使得尾流對壓力擾動以及噪音的影響較不明顯；故習知技術具有下列缺點：
1.結構設計受限；
2.無法依特性靈活設計；
3.噪音大。

The current electronic industry is developing rapidly, and the performance of electronic components is constantly improving. As the speed of operation increases, the heat generated by it will generate relatively large amounts of heat. If the heat cannot be immediately dissipated, the computing power of the electronic component will be If it is lowered, it will cause burnt, so it is used as a heat dissipation in a limited system space through a small centrifugal fan. The centrifugal fan mainly includes a frame body, a fan hub, and a plurality of fan blades disposed outside the fan hub. The frame body has an air inlet port respectively above and below, and an air outlet port on the side of the frame body. When the fan body is rotated, the surrounding air flows through the fan blade body, and the axial flow from the air inlet port is entered. After being steered by the radial airflow along the fan hub, it is discharged by the air outlet.
When the centrifugal fan is running, noise will be generated due to the interaction between the non-uniform wake and the tip of the tongue, and when the gap between the impeller and the tip of the tongue is narrow, the noise is affected by the wake at the tip of the tongue and near the tip of the tongue. The pressure difference causes the tongue to oscillate. When the gap reaches 20% of the impeller radius, the main noise source only has the effect of the wake and is small. In addition, the increased vane between the impeller blades can reduce the strength of the wake, so that the influence of the wake on the pressure disturbance and noise is less obvious; therefore, the prior art has the following disadvantages:
1. Limited structural design;
2. Can not be flexibly designed according to characteristics;
3. Noisy.

爰此，為解決上述習知技術之缺點，本創作之主要目的，係提供一種具有降低噪音的離心扇葉結構。
為達上述之目的，本創作係提供一種離心扇葉結構，係包含：一輪轂、一扇葉體組；
所述輪轂具有一延伸部；所述扇葉體組具有複數扇葉體，該等扇葉體由該延伸部向外延伸所構形，該等扇葉體間具有一流道及一出風口及一入風口，所述出風口及該入風口分設於該流道兩端，並且與該流道相連通，該等出風口係呈非等距設置。
透過扇葉體組之出風口選擇以不同間距設置，可降低扇葉通過舌口（BPF）的單音，並可增加（BPF）頻率，降低聲壓加權量大幅降低噪音，並且可依邊界條件靈活設計扇葉結構。

Accordingly, in order to solve the above-mentioned shortcomings of the prior art, the main object of the present invention is to provide a centrifugal fan blade structure with reduced noise.
For the above purposes, the present invention provides a centrifugal fan blade structure comprising: a hub and a blade body set;
The hub has an extension; the blade body group has a plurality of blade bodies, and the blade body is configured to extend outwardly from the extension portion, and the fan blade body has a first-class road and an air outlet. An air inlet and an air inlet are respectively disposed at two ends of the flow channel and are in communication with the flow channel, and the air outlets are disposed at a non-equal distance.
The air outlets through the blade body group are selected at different spacings to reduce the single tone of the blade through the tongue (BPF), and increase the (BPF) frequency, reduce the sound pressure weighting amount, greatly reduce the noise, and can be based on the boundary conditions. Flexible design of the fan blade structure.

本創作之上述目的及其結構與功能上的特性，將依據所附圖式之較佳實施例予以說明。
請參閱第1、2圖，係為本創作之離心扇葉結構第一實施例之立體及俯視圖，如圖所示，所述離心扇葉結構1，係包含：一輪轂11、一扇葉體組12；
所述輪轂11具有一延伸部111；
所述扇葉體組12具有複數扇葉體121，該等扇葉體121由該延伸部111向外延伸所構形，該等扇葉體121間具有一流道121a及一出風口121b及一入風口121c，所述出風口121b及該入風口121c分設於該流道121a兩端，並且與該流道121a相連通，該等出風口121b係呈非等距設置。
該等扇葉體121具有一第一端1211及一第二端1212，該入風口121c係由兩相鄰扇葉體121之第一端1211共同界定，該等出風口121b係由兩相鄰扇葉體121之第二端1212共同界定。
該等第一端1211共同定義一第一節圓13，並該第一節圓13與該第一端1211相交切線方向具有一第一切線14，該扇葉體121定義一扇葉體中線1213，該扇葉體中線1213與該第一端1211相交切線方向具有一第二切線15，該第二切線15與該第一切線14相交並共同界定一入風角16。
該等第二端1212共同定義一第二節圓17，並該第二節圓17與該第二端1212相交切線方向具有一第三切線18，該扇葉體中線1213與該第二端1212相交切線方向具有一第四切線19，該第三切線18與該第四切線19相交並共同界定一出風角20，本實施例之因該等第二端1212之寬度係不相等，意指將兩寬度不同之扇葉體121交錯環繞設置於該輪轂11之延伸部111，令該等出風口121b呈不等距。
請參閱第3圖，係為本創作之離心扇葉結構第二實施例之俯視圖，如圖所示，本實施例部分結構係與前述第一實施例相同故在此將不再贅述，惟本實施例與前述第一實施例之不同處係為該等出風角20之角度係不相等，意指至少兩扇葉體121彼此之出風角20不相同，亦可將兩出風角20不同之扇葉體121交錯環繞設置於該輪轂11之延伸部111。
請參閱第4圖，係為本創作之離心扇葉結構第三實施例之俯視圖，如圖所示，本實施例部分結構係與前述第一實施例相同故在此將不再贅述，惟本實施例與前述第一實施例之不同處係為該等扇葉體121中至少一扇葉體121與其他扇葉體121之長度不相等。

The above object of the present invention, as well as its structural and functional features, will be described in accordance with the preferred embodiments of the drawings.
1 and 2 are a perspective view and a plan view of a first embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the centrifugal fan blade structure 1 comprises: a hub 11 and a blade body. Group 12;
The hub 11 has an extension portion 111;
The blade body group 12 has a plurality of blade bodies 121, and the blade body 121 is configured to extend outwardly from the extending portion 111. The blade body 121 has a first-class track 121a and an air outlet 121b and a The air inlet 121c, the air outlet 121b and the air inlet 121c are disposed at two ends of the flow path 121a, and communicate with the flow path 121a, and the air outlets 121b are disposed at a non-equal distance.
The fan blade body 121 has a first end 1211 and a second end 1212. The air inlet 121c is defined by a first end 1211 of two adjacent blade bodies 121. The air outlets 121b are adjacent to each other. The second ends 1212 of the blade body 121 are collectively defined.
The first end 1211 defines a first pitch circle 13 together, and the first pitch circle 13 intersects the first end 1211 in a tangential direction with a first tangent line 14 defined by a blade body. In line 1213, the blade body centerline 1213 intersects the first end 1211 in a tangential direction with a second tangent line 15 that intersects the first tangent line 14 and collectively defines an air inlet angle 16.
The second ends 1212 together define a second pitch circle 17, and the second pitch circle 17 intersects the second end 1212 in a tangential direction with a third tangent line 18, the blade body center line 1213 and the second end The intersecting tangential direction of the 1212 has a fourth tangent line 19, and the third tangent line 18 intersects with the fourth tangent line 19 to define an air exit angle 20. The width of the second end 1212 is not equal in this embodiment. The blade body 121 having two different widths is alternately disposed around the extending portion 111 of the hub 11 so that the air outlets 121b are not equidistant.
Please refer to FIG. 3 , which is a top view of the second embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and therefore will not be described herein again. The difference between the embodiment and the foregoing first embodiment is that the angles of the wind exit angles 20 are not equal, meaning that at least two blade bodies 121 are different from each other in the air exit angle 20, and the two wind exit angles 20 may also be Different blade bodies 121 are alternately disposed around the extension 111 of the hub 11.
Please refer to FIG. 4 , which is a top view of the third embodiment of the centrifugal fan blade structure of the present invention. As shown in the figure, the structure of the embodiment is the same as that of the first embodiment, and therefore will not be described herein again. The difference between the embodiment and the first embodiment is that the lengths of at least one of the blade bodies 121 and the other blade bodies 121 are not equal.

1‧‧‧離心扇葉結構
11‧‧‧輪轂
111‧‧‧延伸部
12‧‧‧扇葉體組
121‧‧‧扇葉體
121a‧‧‧流道
121b‧‧‧出風口
121c‧‧‧入風口
1211‧‧‧第一端
1212‧‧‧第二端
1213‧‧‧扇葉體中線
13‧‧‧第一節圓
14‧‧‧第一切線
15‧‧‧第二切線
16‧‧‧入風角
17‧‧‧第二節圓
18‧‧‧第三切線
19‧‧‧第四切線
20‧‧‧出風角1‧‧‧ centrifugal fan blade structure
11‧‧·wheels
111‧‧‧Extension
12‧‧‧Face leaf group
121‧‧‧Leather body
121a‧‧‧ runner
121b‧‧‧air outlet
121c‧‧‧ inlet
1211‧‧‧ first end
1212‧‧‧ second end
1213‧‧‧The blade body midline
13‧‧‧The first quarter
14‧‧‧first tangent
15‧‧‧second tangent
16‧‧‧Into the wind angle
17‧‧‧The second quarter
18‧‧‧ third tangent
19‧‧‧ fourth tangent
20‧‧‧Out of the wind

第1圖係為本創作之離心扇葉結構第一實施例之立體圖；
第2圖係為本創作之離心扇葉結構第一實施例之俯視圖；
第3圖係為本創作之離心扇葉結構第二實施例之俯視圖；
第4圖係為本創作之離心扇葉結構第三實施例之俯視圖。

Figure 1 is a perspective view of a first embodiment of the centrifugal fan blade structure of the present invention;
Figure 2 is a plan view of the first embodiment of the centrifugal fan blade structure of the present invention;
Figure 3 is a plan view of a second embodiment of the centrifugal fan blade structure of the present invention;
Figure 4 is a plan view of a third embodiment of the centrifugal fan blade structure of the present invention.

1‧‧‧離心扇葉結構 1‧‧‧ centrifugal fan blade structure

11‧‧‧輪轂 11‧‧·wheels

111‧‧‧延伸部 111‧‧‧Extension

12‧‧‧扇葉體組 12‧‧‧Face leaf group

121‧‧‧扇葉體 121‧‧‧Leather body

121a‧‧‧流道 121a‧‧‧ runner

121b‧‧‧出風口 121b‧‧‧air outlet

121c‧‧‧入風口 121c‧‧‧ inlet

1211‧‧‧第一端 1211‧‧‧ first end

1212‧‧‧第二端 1212‧‧‧ second end

Claims

A centrifugal fan blade structure comprising:
a hub having an extension;
a leaf body group having a plurality of blade bodies, wherein the blade body body is configured to extend outwardly from the extension portion, and the fan blade body has a first-class road and an air outlet and an air inlet, the air outlet And the air inlet is disposed at two ends of the flow channel and is in communication with the flow channel, and the air outlets are disposed at a non-equal distance.

The centrifugal fan blade structure of claim 1, wherein the blade body has a first end and a second end, the air inlet being jointly defined by the first ends of the two adjacent blade bodies. The air outlets are jointly defined by the second ends of the two adjacent blade bodies.

The centrifugal fan blade structure of claim 2, wherein the widths of the second ends are not equal.

The centrifugal fan blade structure of claim 2, wherein the first ends collectively define a first pitch circle, and the first pitch circle has a first tangent line intersecting the first end in a tangential direction, The blade body defines a blade body center line, and the blade body center line intersects the first end in a tangential direction with a second tangent line, the second tangent line intersects the first tangent line and jointly defines an air inlet angle .

The centrifugal fan blade structure of claim 2, wherein the second ends collectively define a second pitch circle, and the second pitch circle has a third tangent to the tangential direction intersecting the second end, The blade body defines a blade body center line, and the blade body center line intersects the second end in a tangential direction having a fourth tangent line, the third tangent line intersecting the fourth tangent line and jointly defining an air exit angle, The angles of the exiting wind angles are not equal.

The centrifugal fan blade structure according to claim 1, wherein at least one of the blade body and the other blade body are not equal in length.