JPH04113000A - Axial flow fan - Google Patents

Abstract

PURPOSE:To prevent burble at the rear root area of a fan blade near a shaft portion and improve work efficiency of the whole blade by providing, inside each of plural blades which project from the circumferential surface of the shaft portion, a ventilating channel which extends from a front end area to a rear root area and inclines from the outer circumferential area to the inner circumferential area of the blade. CONSTITUTION:An axial flow fan consists of a shaft portion 1 mounted on a driving shaft and plural blades 2 radially projecting from the circumferential surface of the shaft portion 1 at predetermined intervals. In this case, a ventilating channel 5 which inclines from the outer circumferential area to the inner circumferential area of the blade, with an inlet port 3 opening in the front end area and the outlet port 4 opening in a rear root area of the blade surface, is provided through the inside of each blade 2. As the blade 2 revolves, air flow is brown out from the outlet port 4 of the ventilating channel 5, inclining from outer circumferential area to the inner circumferential area of the blade, toward the inner circumference. Due to this, air flow bent outward by centrifugal force near the shaft portion 1 of the rear root area of the blade is bent toward the inner circumference. This prevents burble near the rear end of the blade 2 on the inner circumference where burble is apt to occur and work efficiency is improved by forcing of the whole blade, to work.

Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明は、例えば電子機器やラジェターの冷却用ファ
ンとして供される軸流ファンに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an axial fan used as a cooling fan for, for example, electronic equipment or a radiator.

［従来の技術］ 第４図は、例えば特開平２−１１２７０号公報や実開平
２−３４７９６号公報に示された従来の軸流ファンの精
造を示したものである。即ち、駆動軸に取付けられる軸
部ｌにはその周面に所定の間隔をおいて放射状態に複数
枚の羽根２が設けられている。この各羽根２にはそれぞ
れに、羽根２の前方に取入口３が開口し、羽根２の後方
に吹出口４が開口した通風Ｆｌ＠　５が直線的に内部を
貫いて形成されている。[Prior Art] FIG. 4 shows a refinement of a conventional axial fan disclosed in, for example, Japanese Patent Laid-Open No. 2-11270 and Japanese Utility Model Application No. 2-34796. That is, a plurality of blades 2 are provided on the circumferential surface of the shaft portion l attached to the drive shaft in a radial manner at predetermined intervals. Each of the blades 2 has an intake port 3 opened in front of the blade 2 and a ventilation port 4 opened in the rear of the blade 2, thereby forming a ventilation hole Fl@5 extending linearly through the inside thereof.

上記構成の軸流ファンの動作を説明する。軸流ファンが
回転した場合、一般に第５図に示すように羽根表面に沿
う空気の流れは、流体の粘性により表面近くで減速され
ることになり、羽根２の後端部では空気流の剥離が生じ
がちになる。空気流の剥離は羽根２の効率を下げ、性能
を低下させる二とになる。このとき、羽根２に設けられ
た通風路５は羽８！２の後方の吹出口４から二次空気を
吹出し、羽根２の後端部での剥離を防いでいる。従って
、通風Ｆｌ＠　５により剥離による性能の低下を抑える
二とができる。The operation of the axial fan having the above configuration will be explained. When an axial fan rotates, the airflow along the blade surface is generally decelerated near the surface due to the viscosity of the fluid, as shown in Figure 5, and the airflow is separated at the rear end of the blade 2. tends to occur. Separation of the airflow reduces the efficiency of the vanes 2, resulting in reduced performance. At this time, the ventilation passage 5 provided in the blade 2 blows out secondary air from the outlet 4 at the rear of the blade 8!2, thereby preventing the blade 2 from peeling off at the rear end. Therefore, ventilation Fl@5 can suppress the deterioration in performance due to peeling.

［発明が解決しようとする課題： 上記した従来の軸流ファンにおいては、羽根２の回転に
よる遠心力で羽根表面及び通風Ｆ！＠　５内の空気流が
調相２の後端にいくほど第６図に示すように外周方向ｌ
Ｘ曲げられ、羽根２の後端の軸部１に近い部分は、あま
り仕事をしないことになるといった解決すべき課題を含
んでいる。[Problem to be solved by the invention: In the conventional axial flow fan described above, the centrifugal force caused by the rotation of the blades 2 causes the blade surface and the ventilation F! As the air flow in @ 5 moves toward the rear end of phase adjustment 2, it increases in the outer circumferential direction l as shown in Figure 6.
There is a problem to be solved in that the portion near the shaft portion 1 at the rear end of the blade 2, which is bent in an X direction, does not do much work.

この発明はかかる従来の課題を解消するためになされた
ものでその目的は、羽根の後端部での剥離の防止ととも
に、羽根の後端の軸部に近い部分での働きを向上させ、
羽根全体の効率の向上を計りつる軸流ファンを提供する
ことである。This invention was made in order to solve such conventional problems, and its purpose is to prevent peeling at the rear end of the blade, improve the function of the rear end of the blade near the shaft,
An object of the present invention is to provide an axial flow fan that improves the efficiency of the entire blade.

［課題を解決するための手段］ この発明に係る１ｌｌｌ流フアンは、軸部周面に突設さ
れた複数枚の羽根の内部に、羽根面先端から後端にかけ
て羽根外周部から内周部の方向に傾く通風路を設けたも
のである。[Means for Solving the Problems] The 1llll flow fan according to the present invention has a plurality of blades protruding from the peripheral surface of the shaft portion, and a portion extending from the outer peripheral portion to the inner peripheral portion of the blade from the tip to the rear end of the blade surface. It is equipped with a ventilation passage that tilts in the direction.

［作用コ この発明においては、羽根外周部から内周部の方向に傾
く通風路の吹出口からの空気流により、羽根後端の軸部
近くの遠心力で外周方向へ曲げられる空気流を内周方向
に傾けることができ、剥離の起きやすい羽根の内周部後
端寄りの剥離防止とともに、羽根全体が仕事をすること
になる。[Function] In this invention, the airflow from the outlet of the ventilation passage tilting from the outer circumference of the blade toward the inner circumference causes the airflow bent toward the outer circumference by the centrifugal force near the shaft at the rear end of the blade to be It can be tilted in the circumferential direction, which prevents peeling of the rear end of the inner circumference of the blade where peeling tends to occur, and allows the entire blade to do the work.

［実施例］ 第１図〜第３図はいずれも本発明の一実施例を示したも
ので、第１図は軸流ファンの平面図、第２図は軸流ファ
ンの構造を示す斜視図、第３図は同じく機能を示す説明
図である。区側の軸流ファンは、駆動軸（図示しない）
に対して取付けられる軸部１と、この軸部１の周面に所
定の間隔をおいて放射状態に突設された複数枚の羽根２
とからなる。この各羽根２にはそれぞれの内部に、羽根
面先端に取入口３が開口し、後端に吹出口４が開口する
羽根外周部から内周部の方向に傾く通風路５が貫き設け
られている。[Example] Figures 1 to 3 all show an example of the present invention, with Figure 1 being a plan view of an axial fan and Figure 2 being a perspective view showing the structure of the axial fan. , FIG. 3 is an explanatory diagram similarly showing the functions. The axial fan on the ward side has a drive shaft (not shown).
A shaft portion 1 attached to the shaft portion 1, and a plurality of blades 2 protruding radially from the circumferential surface of the shaft portion 1 at predetermined intervals.
It consists of. Each of the blades 2 is provided with a ventilation passage 5 that slopes from the outer periphery to the inner periphery of the blade, with an intake port 3 opening at the tip of the blade surface and an air outlet 4 opening at the rear end. There is.

上記構成の軸流ファンにおいては、第３図に示すように
羽根２の回転により羽根外周部から内周部の方向に傾く
通風路５の吹出口４から内周方向に空気流か吹出し、こ
の空気流により、羽根後端の軸部１近くの遠心力で外周
方向ｊ＼曲けられる空気流を内周方向に曲げ込むことか
できる。従って、剥離の起きやすい羽根２の内周部後端
寄りの剥離の防止とともに、羽根全体で仕事をさせるこ
とができるようになり、効率が良くなる。In the axial fan having the above configuration, as shown in FIG. 3, as the blades 2 rotate, an airflow is blown in the inner circumferential direction from the outlet 4 of the ventilation passage 5 which is inclined from the outer circumferential part to the inner circumferential part of the blade. Due to the airflow, the airflow that is bent in the outer circumferential direction by the centrifugal force near the shaft portion 1 at the rear end of the blade can be bent in the inner circumferential direction. Therefore, it is possible to prevent separation of the rear end of the inner circumferential portion of the blade 2, where separation is likely to occur, and to allow the entire blade to do the work, improving efficiency.

［発明の効果コ 以上、実施例による説明からも明らかなように本発明に
よれば、羽根外周部から内周部の方向に傾く通風路の吹
出口から内周方向に空気流が吹出すので、羽根後端の軸
部近くの遠心力で外周方向へ曲げられる空気流を内周方
向に曲げ込ませることができ、羽根後端の軸部近くの剥
離の防止とともに、羽根全体に仕事をさせることができ
、効率の向上を計ることができる。[Effects of the Invention] As is clear from the above description of the embodiments, according to the present invention, the airflow is blown out in the inner circumferential direction from the outlet of the ventilation passage that is inclined from the outer circumference of the blade toward the inner circumference. , airflow that is bent toward the outer circumference by centrifugal force near the shaft at the rear end of the blade can be bent toward the inner circumference, preventing separation near the shaft at the rear end of the blade and allowing the entire blade to work. It is possible to measure efficiency improvements.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例としての軸流ファンの構成を
示す平面図、第２図は同じく軸流ファンの構造を示す斜
視図、第３図は同じく軸流ファンの機能を示す説明図、
第４図は従来例の軸流ファンの構造を示す斜視図、第５
図は同じくその機能を示す説明図、第６図は同じ〈従来
例の軸流ファンにおける空気の流れを示す説明図である
。図において、１は軸部、２は羽根、３は取入口、４は
吹出口、５は通風路である。 なお、図中同一符号は、同−又は相当部分を示す。 代理人　大　岩　増　雄（他２名） 第 ■ 図 第４ 図Fig. 1 is a plan view showing the configuration of an axial fan as an embodiment of the present invention, Fig. 2 is a perspective view showing the structure of the axial fan, and Fig. 3 is an explanation showing the function of the axial fan. figure,
Figure 4 is a perspective view showing the structure of a conventional axial fan;
The same figure is an explanatory diagram showing the function, and FIG. 6 is an explanatory diagram showing the air flow in the same conventional axial fan. In the figure, 1 is a shaft, 2 is a blade, 3 is an intake port, 4 is an outlet, and 5 is a ventilation path. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Figure ■ Figure 4

Claims (1)

【特許請求の範囲】[Claims] 軸部周面に所定の間隔をおいて放射状態に突設された複
数枚の羽根の内部に、羽根面先端から後端にかけて羽根
外周部から内周部の方向に傾く通風路を設けたことを特
徴とする軸流ファン。A ventilation passage is provided inside a plurality of blades protruding radially from the shaft circumferential surface at predetermined intervals from the tip of the blade surface to the rear end, tilting from the outer circumference to the inner circumference of the blade. An axial fan featuring