TWI418709B - Blowing fan and blower using the same - Google Patents
Blowing fan and blower using the same Download PDFInfo
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- TWI418709B TWI418709B TW099124719A TW99124719A TWI418709B TW I418709 B TWI418709 B TW I418709B TW 099124719 A TW099124719 A TW 099124719A TW 99124719 A TW99124719 A TW 99124719A TW I418709 B TWI418709 B TW I418709B
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- air
- blower fan
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/288—Part of the wheel having an ejecting effect, e.g. being bladeless diffuser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
本發明係有關於一種將空氣吹出至離心方向之送風扇及使用其之送風機。The present invention relates to a blower fan that blows air to a centrifugal direction and a blower using the same.
將空氣吹出至離心方向之送風扇、即所謂之離心風扇係以日本專利公開公報2007-170331號記載之離心風扇來說明。第12圖係專利文獻1記載之習知離心風扇之立體圖。第13圖係習知離心風扇之部份上面圖。此外，在第12圖及第13圖，以箭號R顯示離心風扇之旋轉方向。A centrifugal fan that blows air to the centrifugal direction, that is, a centrifugal fan, is described by a centrifugal fan described in Japanese Laid-Open Patent Publication No. 2007-170331. Fig. 12 is a perspective view of a conventional centrifugal fan described in Patent Document 1. Figure 13 is a partial view of a portion of a conventional centrifugal fan. Further, in Fig. 12 and Fig. 13, the direction of rotation of the centrifugal fan is indicated by an arrow R.
如第12圖所示，離心風扇包含有轂板21、與轂板21相對而設之環狀覆板22、配設於轂板21與覆板22間之複數個葉片23。轂板21之外形部21a為圓形，於中心具有孔21b。於孔21b可固定馬達(圖中未示)之旋轉軸。覆板22之外形部22a為圓形，於中央具有開口22b。葉片23之表面呈3維形狀。又，葉片23配設成為內周側端部之前緣24比為外周側端部之後緣25還靠近旋轉方向側。As shown in Fig. 12, the centrifugal fan includes a hub plate 21, an annular sheathing plate 22 provided to face the hub plate 21, and a plurality of blades 23 disposed between the hub plate 21 and the sheathing plate 22. The outer shape portion 21a of the hub plate 21 has a circular shape and has a hole 21b at the center. The rotating shaft of the motor (not shown) can be fixed to the hole 21b. The outer portion 22a of the sheathing plate 22 has a circular shape and has an opening 22b at the center. The surface of the blade 23 has a three-dimensional shape. Further, the blade 23 is disposed such that the front edge 24 of the inner circumferential side end portion is closer to the rotation direction side than the rear edge 25 of the outer circumferential side end portion.
離心風扇20可藉馬達之驅動而旋轉。藉離心風扇20之旋轉，從覆板22之開口22b吸入空氣。所吸入之空氣從葉片23之前緣24往後緣25引導，而往離心風扇20之外側吹出。The centrifugal fan 20 can be rotated by the driving of the motor. The air is taken in from the opening 22b of the cover panel 22 by the rotation of the centrifugal fan 20. The sucked air is guided from the leading edge 24 of the blade 23 to the trailing edge 25, and is blown toward the outside of the centrifugal fan 20.
第13圖之部份上面圖係從覆板22側觀看離心風扇20之一部份。C係旋轉之中心。在此，以葉片23之後緣25之轂板21側作為轂板側後緣25a，以葉片23之後緣25之覆板22側作為覆板側後緣25b。葉片23呈轂板側後緣25a比覆板22側後緣25b還靠近旋轉方向側之形狀。亦即，葉片23之後緣25呈相對於旋轉軸方向傾斜之形狀。離心風扇20將從覆板22之開口22b所吸入之空氣做約略直角之流向改變，而吹出至外側。在此，當葉片23不具如上述之3維形狀時，通過離心風扇20之內部之空氣偏於轂板21之側。如上述，藉令葉片23呈使轂板側後緣25a比覆板側後緣25b還靠近旋轉方向側之形狀，所吸入之空氣在從前緣24往後緣25引導之期間，可從轂板21側往覆板22側引導。藉此，可將為離心風扇20之吹出部份之葉片23的後緣25之空氣風速分佈可均一化。Part of the above view of Fig. 13 is a view of a portion of the centrifugal fan 20 from the side of the cover panel 22. The center of the C system rotation. Here, the side of the hub plate 21 of the trailing edge 25 of the blade 23 serves as the hub-side rear edge 25a, and the side of the cover 22 of the trailing edge 25 of the blade 23 serves as the sheath-side trailing edge 25b. The blade 23 has a shape in which the hub-side rear edge 25a is closer to the rotational direction side than the sheath 22 side trailing edge 25b. That is, the trailing edge 25 of the blade 23 has a shape that is inclined with respect to the direction of the rotation axis. The centrifugal fan 20 changes the flow direction of the air taken in from the opening 22b of the cover panel 22 at a substantially right angle, and blows it to the outside. Here, when the blade 23 does not have the three-dimensional shape as described above, the air passing through the inside of the centrifugal fan 20 is biased to the side of the hub plate 21. As described above, the blade 23 is configured such that the hub side rear edge 25a is closer to the rotation direction side than the sheath side rear edge 25b, and the sucked air can be guided from the hub plate during the guidance from the leading edge 24 to the trailing edge 25. The 21 side is guided to the side of the cover panel 22. Thereby, the air velocity distribution of the trailing edge 25 of the blade 23 which is the blow-out portion of the centrifugal fan 20 can be made uniform.
在此，以葉片23之前緣24之轂板21側為轂板側前緣24a，以葉片23之前緣24之覆板22側為覆板側前緣24b。如第13圖所示，葉片23呈轂板側前緣之入口角βh大於覆板側前緣24b之入口角βs的形狀。即，葉片23呈前緣24之入口角呈從轂板21側朝覆板22側逐漸減少之形狀。此外，關於葉片23之後緣25，誠如上述，呈出口角從轂板21側朝覆板22側逐漸變化之形狀。Here, the hub plate 21 side of the leading edge 24 of the blade 23 is the hub side leading edge 24a, and the side of the covering plate 22 of the leading edge 24 of the blade 23 is the covering side leading edge 24b. As shown in Fig. 13, the blade 23 has a shape in which the inlet angle βh of the hub-side leading edge is larger than the inlet angle βs of the sheath-side leading edge 24b. That is, the blade 23 has a shape in which the entrance angle of the leading edge 24 gradually decreases from the side of the hub plate 21 toward the side of the sheathing plate 22. Further, as for the trailing edge 25 of the blade 23, as described above, the outlet angle gradually changes from the side of the hub plate 21 toward the side of the sheathing plate 22.
亦即，習知離心風扇20之葉片23呈入口角及出口角從轂板21側朝覆板22側逐漸變化的3維形狀。又，葉片23呈厚度逐漸變化之3維形狀。藉此，可將吹出之空氣之風速分佈均一化，而可在不使離心風扇20之性能降低下，減低噪音。That is, the blade 23 of the conventional centrifugal fan 20 has a three-dimensional shape in which the inlet angle and the outlet angle gradually change from the hub plate 21 side toward the sheathing plate 22 side. Further, the blade 23 has a three-dimensional shape in which the thickness gradually changes. Thereby, the wind speed distribution of the blown air can be made uniform, and the noise can be reduced without deteriorating the performance of the centrifugal fan 20.
然而，離心風扇20之葉片23通常以金屬板製作。由於以金屬板所製作之葉片23為薄板，故不易呈如上述之3維形狀。特別是不易呈厚度逐漸變化之3維形狀。為獲得此種3維形狀，當將以金屬板構成之薄板2片合在一起，製作葉片23時，不僅耗費成本，而且使離心風扇20旋轉時之平衡差。再者，不將葉片23以金屬板製作，而以樹脂製作時，雖可呈3維形狀，但耗費製作成本。因而，為謀求因風速分佈均一化所致之離心風扇20之性能維持及噪音減低，當使用3維形狀之葉片23時，不易以低成本製作離心風扇20。However, the blades 23 of the centrifugal fan 20 are usually made of a metal plate. Since the blade 23 made of a metal plate is a thin plate, it is difficult to exhibit the three-dimensional shape as described above. In particular, it is difficult to form a three-dimensional shape in which the thickness gradually changes. In order to obtain such a three-dimensional shape, when the thin plates 2 made of a metal plate are combined, the blade 23 is produced, which is not only costly, but also has a poor balance when the centrifugal fan 20 is rotated. Further, the blade 23 is not made of a metal plate, and when it is made of a resin, it can have a three-dimensional shape, but it is costly to manufacture. Therefore, in order to maintain the performance and noise reduction of the centrifugal fan 20 due to the uniformity of the wind speed distribution, when the three-dimensional blade 23 is used, it is difficult to manufacture the centrifugal fan 20 at low cost.
本發明可以低價提供達成了因將風速分佈均一化所致之性能維持及噪音減低之送風扇。The present invention can provide a blower fan that achieves performance maintenance and noise reduction due to uniformity of wind speed distribution at a low price.
本發明之送風扇包含有可固定馬達之旋轉軸之轂、與轂相對而設之覆板、及配設於轂與覆板間之複數個葉片；並於葉片之後緣與覆板間形成有間隙。藉使風流至此間隙，可維持性能，並使在送風扇最外周之風速降低，而可減低風切頻率噪音。又，藉此簡單之結構，可以低價製作送風扇。The blower fan of the present invention comprises a hub for fixing a rotating shaft of the motor, a cover plate disposed opposite the hub, and a plurality of blades disposed between the hub and the cover plate; and a blade is formed between the trailing edge of the blade and the cover plate gap. By allowing the wind to flow to this gap, the performance can be maintained and the wind speed at the outermost circumference of the fan can be reduced, and the wind cutting frequency noise can be reduced. Moreover, with this simple structure, the fan can be produced at a low price.
第1圖係本發明第1實施形態之送風扇之立體圖。Fig. 1 is a perspective view of a blower fan according to a first embodiment of the present invention.
第2圖係第1實施形態之送風扇之上面圖。Fig. 2 is a top view of the blower fan of the first embodiment.
第3圖係第1實施形態之送風扇之截面圖Figure 3 is a cross-sectional view of the fan of the first embodiment
第4圖係第1實施形態之另一送風扇之截面圖。Fig. 4 is a cross-sectional view showing another fan of the first embodiment.
第5圖係第1實施形態之又另一送風扇之截面圖。Fig. 5 is a cross-sectional view showing still another fan of the first embodiment.
第6A圖係搭載有第1實施形態之送風扇之送風機的上面圖。Fig. 6A is a top view of a blower in which the blower fan of the first embodiment is mounted.
第6B圖係第6A圖之6B-6B線之截面圖。Fig. 6B is a cross-sectional view taken along line 6B-6B of Fig. 6A.
第7A圖係顯示第1實施形態之風扇殼體內部之覆板側的空氣流動之說明圖。Fig. 7A is an explanatory view showing the flow of air on the side of the cover plate inside the fan casing of the first embodiment.
第7B圖係顯示第1實施形態之風扇殼體內部之轂側的空氣流動之說明圖。Fig. 7B is an explanatory view showing the flow of air on the hub side inside the fan casing of the first embodiment.
第8圖係顯示不形成間隙之送風扇之噪音特性的說明圖。Fig. 8 is an explanatory view showing the noise characteristics of the blower fan which does not form a gap.
第9圖係顯示第2結構之送風扇之噪音特性的說明圖。Fig. 9 is an explanatory view showing the noise characteristics of the blower fan of the second structure.
第10圖係顯示第1結構之送風扇之噪音特性的說明圖。Fig. 10 is an explanatory view showing the noise characteristics of the blower fan of the first structure.
第11圖係顯示第3結構之送風扇之噪音特性的說明圖。Fig. 11 is an explanatory view showing the noise characteristics of the blower fan of the third structure.
第12圖係習知離心風扇之立體圖。Figure 12 is a perspective view of a conventional centrifugal fan.
第13圖係習知離心風扇之部份上面圖。Figure 13 is a partial view of a portion of a conventional centrifugal fan.
第1圖係本發明第1實施形態之送風扇之立體圖。第2圖係本實施形態之送風扇之上面圖。此外，第2圖係顯示卸除送風扇之之狀態。第3圖係本實施形態之送風扇之截面圖。第4圖係本實施形態之另一送風扇之截面圖。第5圖係本實施形態之又另一送風扇之截面圖。此外，第3圖~第5圖係顯示安裝送風扇之覆板之狀態。又，第3圖~第5圖係模式地顯示葉片之配設狀態者，係包含送風扇之旋轉軸之截面圖。第6A圖係搭載有本實施形態之送風扇之送風機的上面圖。第6B圖係第6A圖之6B-6B線之截面圖。Fig. 1 is a perspective view of a blower fan according to a first embodiment of the present invention. Fig. 2 is a top view of the blower fan of the embodiment. In addition, Fig. 2 shows the state in which the blower fan is removed. Fig. 3 is a cross-sectional view showing the blower fan of the embodiment. Fig. 4 is a cross-sectional view showing another fan of the embodiment. Fig. 5 is a cross-sectional view showing still another fan of the embodiment. In addition, Fig. 3 to Fig. 5 show the state in which the cover plate of the blower fan is mounted. Further, in the third to fifth figures, the arrangement state of the blades is schematically displayed, and the cross-sectional view of the rotating shaft of the blower fan is included. Fig. 6A is a top view of a blower in which the blower fan of the embodiment is mounted. Fig. 6B is a cross-sectional view taken along line 6B-6B of Fig. 6A.
首先，就第6A圖及第6B圖所示之送風機作說明。送風機50係於以蝸牛形狀風扇殼體5形成之空氣流路之內部具有送風扇1及用以使送風扇1旋轉之馬達6。當送風扇1以馬達6之驅動旋轉時，空氣從殼體5之吸入口8吸入，而從吹出口9吹出。此種送風機50藉搭載於衣類洗衣烘衣機或衣類烘衣機(皆未以圖顯示)之空氣循環路徑，吹出空氣，而使含有水分之衣類乾燥。此外，亦可依需要，於空氣循環路徑裝入加熱裝置或除濕裝置。First, the air blower shown in Figs. 6A and 6B will be described. The blower 50 is provided with a blower fan 1 and a motor 6 for rotating the blower fan 1 in an air flow path formed by the snail-shaped fan case 5. When the blower fan 1 is rotated by the drive of the motor 6, air is taken in from the suction port 8 of the casing 5 and blown out from the air outlet 9. Such a blower 50 is blown out by air in an air circulation path of a clothes-type washing and drying machine or a clothes dryer (all of which are not shown), and the clothes containing moisture are dried. In addition, a heating device or a dehumidifying device may be installed in the air circulation path as needed.
如第1圖及第2圖所示，送風扇1包含有轂4、與轂4相對而設之覆板2、配設於轂4與覆板2間之複數個葉片3。轂4呈中央附近於覆板2側隆起成吊鐘狀之約略圓盤之形狀。覆板2呈具有開口之圓環形狀。As shown in FIGS. 1 and 2, the blower fan 1 includes a hub 4, a cover plate 2 opposed to the hub 4, and a plurality of blades 3 disposed between the hub 4 and the cover plate 2. The hub 4 has a shape of a substantially circular disk that is bulged in a bell shape on the side of the cover panel 2 near the center. The cover panel 2 has a circular ring shape with an opening.
又，轂4於中央具有孔4a。如第6B圖所示，轂4利用孔4a及螺絲7，固定於馬達6之旋轉軸6a。當使馬達6逆時鐘旋轉時，轂4、覆板2及葉片3形成一體，而逆時鐘旋轉。藉此，可從殼體5之吸入口8將空氣吸入至覆板2之開口。所吸入之空氣隨著葉片3之旋轉，朝為葉片3端部之後緣3a以放射狀吹出。以放射狀吹出之空氣從吹出口9吹出。Further, the hub 4 has a hole 4a at the center. As shown in Fig. 6B, the hub 4 is fixed to the rotating shaft 6a of the motor 6 by the hole 4a and the screw 7. When the motor 6 is rotated counterclockwise, the hub 4, the cover panel 2, and the vanes 3 are integrally formed and rotated counterclockwise. Thereby, air can be drawn into the opening of the cover panel 2 from the suction port 8 of the casing 5. The sucked air is radially blown toward the trailing edge 3a of the end portion of the blade 3 as the blade 3 rotates. The air blown out in a radial direction is blown out from the air outlet 9.
在此，如第3圖所示，葉片3於後緣3a之覆板2側具有切口部30。藉葉片3具有切口部30，而於葉片3與覆板2間形成間隙11a。以下，將此結構記載為第1結構。當使送風扇1旋轉時，空氣流入至間隙11a。藉此，在風扇殼體5，可使為風速最快之部份之舌狀體10(參照第6A圖)附近之風速減少。舌狀體10係風扇殼體5與送風扇1之間隙最窄之部份。結果，可使風扇殼體5之風速分佈均一化。Here, as shown in FIG. 3, the blade 3 has a notch portion 30 on the side of the cover 2 of the trailing edge 3a. The blade 3 has a cutout portion 30, and a gap 11a is formed between the blade 3 and the cover plate 2. Hereinafter, this structure is described as the first structure. When the blower fan 1 is rotated, air flows into the gap 11a. Thereby, in the fan case 5, the wind speed in the vicinity of the tongue 10 (refer to FIG. 6A) which is the portion where the wind speed is the fastest can be reduced. The tongue 10 is the narrowest portion of the gap between the fan casing 5 and the blower fan 1. As a result, the wind speed distribution of the fan casing 5 can be made uniform.
因切口部30而形成之間隙11a即使於以金屬板製作葉片3時，亦可輕易且以低價形成。又，因間隙11a，風扇殼體5之最大風速減少，風切頻率噪音減低。此外，形成間隙11a之處係葉片3之旋翼性能低之處。因此，即使形成間隙11a，送風機1之送風性能亦幾乎不降低。因而，可維持送風機50之性能，且可減低送風機50之噪音。此外，即使以樹脂製作葉片3時，藉形成因切口部30而形成之間隙11a，可不需下部切割形狀。亦即，可以低成本製作送風扇1。The gap 11a formed by the notch portion 30 can be easily and inexpensively formed even when the blade 3 is formed of a metal plate. Further, due to the gap 11a, the maximum wind speed of the fan casing 5 is reduced, and the wind cutting frequency noise is reduced. Further, the gap 11a is formed where the rotor performance of the blade 3 is low. Therefore, even if the gap 11a is formed, the air blowing performance of the blower 1 is hardly lowered. Thus, the performance of the blower 50 can be maintained, and the noise of the blower 50 can be reduced. Further, even when the blade 3 is made of a resin, by forming the gap 11a formed by the notch portion 30, the lower cut shape is not required. That is, the blower fan 1 can be manufactured at low cost.
在此，就用以於葉片3與覆板2間形成間隙之另一結構(以下記載為第2結構)作說明。如第4圖所示，藉將緣部2a構造成將覆板2之外周緣形成為相對於覆板2之傾斜面2b擴展空氣之出口的方向，而可形成間隙11b。藉此，由於空氣流入至葉片3與覆板2間之間隙11b，故可具有與形成切口部30之間隙11a時同樣之作用及效果。Here, another structure (hereinafter referred to as a second structure) for forming a gap between the blade 3 and the cover plate 2 will be described. As shown in Fig. 4, the edge portion 2a is configured such that the outer peripheral edge of the cover panel 2 is formed to extend the direction of the air outlet with respect to the inclined surface 2b of the cover panel 2, and the gap 11b can be formed. Thereby, since air flows into the gap 11b between the blade 3 and the cover plate 2, it can have the same action and effect as the gap 11a which forms the notch part 30.
就用以於葉片3與覆板2間形成間隙之又另一結構(以下記載為第3結構)作說明。如第5圖所示，葉片3在後緣3a於覆板2側具有切口部30，並且於覆板2之外周緣，緣部2a構造成形成為相對於覆板2之傾斜面2b擴展空氣之出口的方向，而形成間隙11c。亦即，為同時具有第1結構及第2結構之結構。為此結構時，具有大於第1結構及第2結構之作用及效果。特別是對噪音之減低具有相當大之效果。關於此點後述。Another structure (hereinafter referred to as a third structure) for forming a gap between the blade 3 and the sheathing plate 2 will be described. As shown in Fig. 5, the blade 3 has a cutout portion 30 on the side of the cover panel 2 at the trailing edge 3a, and at the outer periphery of the sheathing panel 2, the edge portion 2a is configured to expand air with respect to the inclined surface 2b of the cover panel 2. The direction of the exit forms a gap 11c. That is, it has a structure having both the first structure and the second structure. For this configuration, it has effects and effects greater than those of the first structure and the second structure. In particular, it has a considerable effect on the reduction of noise. This point will be described later.
在此，就如上述所構成之送風扇1及使用其之送風機50之動作作說明。從覆板2之開口流入之空氣於流入設有複數個之葉片3間之際，將流動方向做約略直角之改變。在覆板2與轂4間，在轂4附近流動之空氣改變了流動方向之際的曲率小。因此，空氣以約略曲緣狀順暢地流動，風速之減少少，流路損失亦較小。如此，由於空氣順暢地流動，故葉片3之空氣之剝離現象不易產生。Here, the operation of the blower fan 1 configured as described above and the blower 50 using the same will be described. The air flowing in from the opening of the sheathing plate 2 changes the flow direction at a substantially right angle when flowing between the plurality of blades 3. Between the sheathing plate 2 and the hub 4, the air flowing in the vicinity of the hub 4 has a small curvature at the time of changing the flow direction. Therefore, the air flows smoothly in a roughly curved shape, the decrease in the wind speed is small, and the flow path loss is also small. Thus, since the air flows smoothly, the peeling phenomenon of the air of the blade 3 is less likely to occur.
相對於此，在覆板2與轂4間，在覆板2附近流動之空氣改變流動方向之際之曲率大。因此，空氣急遽彎曲，風速之減少大，流路損失亦大。藉此，空氣之流動紊亂，在葉片3之上部，產生空氣之剝離現象及將空氣以旋渦狀捲入之區域。結果，易產生噪音。On the other hand, between the sheathing plate 2 and the hub 4, the curvature of the air flowing in the vicinity of the sheathing plate 2 is large when the flow direction is changed. Therefore, the air is sharply bent, the wind speed is greatly reduced, and the flow path loss is also large. Thereby, the flow of the air is disturbed, and in the upper portion of the blade 3, a phenomenon of peeling of air and a region in which air is spirally wound are generated. As a result, noise is easily generated.
就此噪音之原因加以說明。當風速之減少大時，向外之風速向量減小，空氣可往送風扇1之旋轉方向拖曳。因此，空氣不致被吹出至送風扇1外。由於在送風扇1之外周之風速因葉片3之位置而脈動，故此脈動使壓力波產生，而形成風切頻率噪音。Explain the reason for this noise. When the wind speed is reduced, the outward wind speed vector is reduced, and the air can be dragged to the direction of rotation of the fan 1 . Therefore, the air is not blown out to the outside of the blower fan 1. Since the wind speed outside the blower fan 1 is pulsated by the position of the blade 3, the pulsation generates a pressure wave to form a wind cut frequency noise.
本實施形態之送風扇1在葉片3，覆板2近處之空氣向外之風速向量小。利用此，本實施形態之送風扇1於葉片3之後緣3a與覆板2間形成間隙，藉使空氣流至此間隙，可縮小在送風扇最外周之空氣之風速。In the fan 1 of the present embodiment, the air velocity in the vicinity of the blade 3 and the cover plate 2 is small. As a result, the blower fan 1 of the present embodiment forms a gap between the trailing edge 3a of the blade 3 and the cover plate 2, and by allowing air to flow to this gap, the wind speed of the air on the outermost circumference of the blower fan can be reduced.
本實施形態之間隙11a、11b、11c之尺寸相對於葉片3之翼弦方向(第3圖之上下方向)為10%以下，相對於推力方向(第3圖之左右方向)為50%以下。間隙11a、11b、11c之尺寸在翼弦方向及推力方向皆大於此以上時，對風切頻率噪音有效果，但有作為送風扇1之性能降低之虞。在此狀態，為維持送風扇1之性能，需增加送風扇之轉速，此時，送風扇1之效率降低。The size of the gaps 11a, 11b, and 11c of the present embodiment is 10% or less with respect to the chord direction of the blade 3 (the upper and lower directions of the third drawing), and is 50% or less with respect to the thrust direction (the horizontal direction of the third drawing). When the sizes of the gaps 11a, 11b, and 11c are both larger than the chord direction and the thrust direction, they are effective for the wind cut frequency noise, but there is a problem that the performance of the blower fan 1 is lowered. In this state, in order to maintain the performance of the blower fan 1, it is necessary to increase the rotational speed of the blower fan, and at this time, the efficiency of the blower fan 1 is lowered.
第7A圖係顯示本實施形態之風扇殼體5內部之覆板2側之空氣流動的說明圖。第7B圖係顯示本實施形態之風扇殼體5內部之覆板2側之空氣流動的說明圖。此外，第7A圖及第7B圖所示之送風扇1係第3結構，間隙11c之尺寸相對於翼弦方向為5%，相對於推力方向為25%。又，送風扇1之直徑係155mm，轉速係5800rpm。此時，送風扇1之最外周之周速度約47m/s。Fig. 7A is an explanatory view showing the flow of air on the side of the cover plate 2 inside the fan casing 5 of the present embodiment. Fig. 7B is an explanatory view showing the flow of air on the side of the cover plate 2 inside the fan casing 5 of the embodiment. Further, the fan 1 shown in FIGS. 7A and 7B is a third structure, and the size of the gap 11c is 5% with respect to the chord direction and 25% with respect to the thrust direction. Further, the fan 1 has a diameter of 155 mm and a rotational speed of 5,800 rpm. At this time, the peripheral speed of the outermost circumference of the blower fan 1 is about 47 m/s.
誠如前述，在送風扇1之內部，在外周方向之空氣之風速向量係覆板2側小於轂4側。因此，在覆板2側，空氣如箭號A所示，往圓周方向流動。當往此圓周方向之流動成份大時，產生風切頻率噪音。As described above, in the inside of the blower fan 1, the wind speed vector of the air in the outer circumferential direction is smaller than the hub 4 side. Therefore, on the side of the cover panel 2, the air flows in the circumferential direction as indicated by the arrow A. When the flow component to the circumferential direction is large, the wind cut frequency noise is generated.
在此，不形成間隙11c時之最大風速係47m/s，本實施形態之送風扇1之最大風速係44m/s。由於壓力脈動音之音壓與流速之6~8次方成比例，故最大風速從47m/s減少至44m/s時，對噪音抑制非常具有效果。Here, the maximum wind speed is 47 m/s when the gap 11c is not formed, and the maximum wind speed of the blower fan 1 of the present embodiment is 44 m/s. Since the sound pressure of the pressure pulsation sound is proportional to the flow rate of 6 to 8 power, the maximum wind speed is reduced from 47 m/s to 44 m/s, which is very effective for noise suppression.
另一方面，使用第8圖~第11圖，就本實施形態之送風扇1之噪音特性作說明。第9圖係顯示第2結構之送風扇1之噪音特性的說明圖。第10圖係顯示第1結構之送風扇1之噪音特性的說明圖。第11圖係顯示第3結構之送風扇1之噪音特性的說明圖。此外，第8圖係顯示用以比較之不形成間隙之送風扇的噪音特性之說明圖。此外，不論哪個風扇，葉片數皆為28片，轉速皆為5400rpm。因此，於葉片數28片與轉速5400rpm之積進一步除以60之2520Hz存在風切頻率。On the other hand, the noise characteristics of the blower fan 1 of the present embodiment will be described using Figs. 8 to 11 . Fig. 9 is an explanatory view showing the noise characteristics of the blower fan 1 of the second configuration. Fig. 10 is an explanatory view showing the noise characteristics of the blower fan 1 of the first configuration. Fig. 11 is an explanatory view showing the noise characteristics of the blower fan 1 of the third configuration. Further, Fig. 8 is an explanatory view showing the noise characteristics of the blower fan for comparison without forming a gap. In addition, regardless of which fan, the number of blades is 28 pieces, and the rotation speed is 5400 rpm. Therefore, the product of the number of blades 28 and the number of revolutions of 5400 rpm is further divided by the 2520 Hz of 60.
第8圖、亦即切口部30、間隙11a、11b、11c、緣部2a皆不具有之送風扇中，在風切頻率2520Hz之噪音如圓形記號所示為28dB。另一方面，在第9圖、亦即為第2結構，於覆板2構成緣部2a，而形成有間隙11b之送風扇1中，在風切頻率2520Hz之噪音如圓形記號所示，為26dB。因而，噪音減低2dB。在第10圖、亦即為第1結構，構成葉片切口部30，而形成有間隙11a之送風扇1中，在風頻率2520Hz之噪音如圓形記號所示，為23dB。因而，噪音減低5dB。在第11圖、亦即為第3結構，構成葉片切口部30及緣部2a，而形成有間隙11c之送風扇1中，在風切頻率2520Hz之噪音如圓形記號所示，為20dB。因而，噪音減低8dB。如以上，藉於葉片3之後緣3a與覆板2間設間隙(間隙11a、11b、11c任一個)，可減低噪音。In Fig. 8, that is, the slit portion 30, the gaps 11a, 11b, 11c, and the edge portion 2a are not provided in the fan, the noise at the wind cut frequency of 2520 Hz is 28 dB as indicated by a circular mark. On the other hand, in the ninth figure, that is, the second structure, the cover plate 2 constitutes the edge portion 2a, and in the blower fan 1 in which the gap 11b is formed, the noise at the wind cut frequency of 2520 Hz is indicated by a circular mark. It is 26dB. Therefore, the noise is reduced by 2 dB. In Fig. 10, that is, the first structure, the blade notch portion 30 is formed, and in the fan 1 in which the gap 11a is formed, the noise at a wind frequency of 2520 Hz is 23 dB as indicated by a circular mark. Therefore, the noise is reduced by 5 dB. In the eleventh configuration, that is, the third structure, the blade notch portion 30 and the edge portion 2a are formed, and in the blower fan 1 in which the gap 11c is formed, the noise at the wind cut frequency of 2520 Hz is 20 dB as indicated by a circular mark. Therefore, the noise is reduced by 8 dB. As described above, by providing a gap (any of the gaps 11a, 11b, and 11c) between the trailing edge 3a of the blade 3 and the cover plate 2, noise can be reduced.
1．．．送風扇1. . . Send fan
2，22．．．覆板2,22. . . Covering board
2a．．．緣部2a. . . Edge
2b．．．傾斜面2b. . . Inclined surface
3，23．．．葉片3,23. . . blade
3a，25．．．後緣3a, 25. . . Trailing edge
4．．．轂4. . . hub
4a，21b．．．孔4a, 21b. . . hole
5．．．風扇殼體5. . . Fan housing
6．．．馬達6. . . motor
7．．．螺絲7. . . Screw
8．．．吸入口8. . . suction point
9．．．吹出口9. . . Blowout
10．．．舌狀體10. . . Tongue
11a，11b，11c．．．間隙11a, 11b, 11c. . . gap
20．．．離心風扇20. . . Centrifugal fan
21．．．轂板twenty one. . . Hub plate
21a．．．外形部21a. . . Shape department
22a．．．外形部22a. . . Shape department
22b．．．開口22b. . . Opening
24．．．前緣twenty four. . . Leading edge
24a．．．轂板側前緣24a. . . Hub side leading edge
24b．．．覆板側前緣24b. . . Slab side leading edge
25a．．．轂板側後緣25a. . . Hub plate side trailing edge
25b．．．覆板側後緣25b. . . Slab side trailing edge
30．．．切口部30. . . Cutting section
50．．．送風機50. . . Blower
R．．．旋轉方向R. . . turn around
第1圖係本發明第1實施形態之送風扇之立體圖。Fig. 1 is a perspective view of a blower fan according to a first embodiment of the present invention.
第2圖係第1實施形態之送風扇之上面圖。Fig. 2 is a top view of the blower fan of the first embodiment.
第3圖係第1實施形態之送風扇之截面圖Figure 3 is a cross-sectional view of the fan of the first embodiment
第4圖係第1實施形態之另一送風扇之截面圖。Fig. 4 is a cross-sectional view showing another fan of the first embodiment.
第5圖係第1實施形態之又另一送風扇之截面圖。Fig. 5 is a cross-sectional view showing still another fan of the first embodiment.
第6A圖係搭載有第1實施形態之送風扇之送風機的上面圖。Fig. 6A is a top view of a blower in which the blower fan of the first embodiment is mounted.
第6B圖係第6A圖之6B-6B線之截面圖。Fig. 6B is a cross-sectional view taken along line 6B-6B of Fig. 6A.
第7A圖係顯示第1實施形態之風扇殼體內部之覆板側的空氣流動之說明圖。Fig. 7A is an explanatory view showing the flow of air on the side of the cover plate inside the fan casing of the first embodiment.
第7B圖係顯示第1實施形態之風扇殼體內部之轂側的空氣流動之說明圖。Fig. 7B is an explanatory view showing the flow of air on the hub side inside the fan casing of the first embodiment.
第8圖係顯示不形成間隙之送風扇之噪音特性的說明圖。Fig. 8 is an explanatory view showing the noise characteristics of the blower fan which does not form a gap.
第9圖係顯示第2結構之送風扇之噪音特性的說明圖。Fig. 9 is an explanatory view showing the noise characteristics of the blower fan of the second structure.
第10圖係顯示第1結構之送風扇之噪音特性的說明圖。Fig. 10 is an explanatory view showing the noise characteristics of the blower fan of the first structure.
第11圖係顯示第3結構之送風扇之噪音特性的說明圖。Fig. 11 is an explanatory view showing the noise characteristics of the blower fan of the third structure.
第12圖係習知離心風扇之立體圖。Figure 12 is a perspective view of a conventional centrifugal fan.
第13圖係習知離心風扇之部份上面圖。Figure 13 is a partial view of a portion of a conventional centrifugal fan.
1．．．送風扇1. . . Send fan
2．．．覆板2. . . Covering board
3．．．葉片3. . . blade
3a．．．後緣3a. . . Trailing edge
4．．．轂4. . . hub
4a．．．孔4a. . . hole
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009210072A JP4894900B2 (en) | 2009-09-11 | 2009-09-11 | Blower fan and blower using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201109532A TW201109532A (en) | 2011-03-16 |
| TWI418709B true TWI418709B (en) | 2013-12-11 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW099124719A TWI418709B (en) | 2009-09-11 | 2010-07-27 | Blowing fan and blower using the same |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2295817A3 (en) |
| JP (1) | JP4894900B2 (en) |
| CN (2) | CN201851371U (en) |
| TW (1) | TWI418709B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140131750A (en) * | 2013-05-06 | 2014-11-14 | 엘지전자 주식회사 | Centrifugal Fan |
| KR101677030B1 (en) | 2013-05-10 | 2016-11-17 | 엘지전자 주식회사 | Centrifugal fan |
| EP2829733B1 (en) | 2013-05-10 | 2021-01-27 | Lg Electronics Inc. | Centrifugal fan |
| JP2016121580A (en) * | 2014-12-24 | 2016-07-07 | ダイキン工業株式会社 | Centrifugal blower |
| CN106015090B (en) * | 2016-06-27 | 2019-03-15 | 珠海格力电器股份有限公司 | A kind of centrifugation blade, centrifugal blower and air-conditioning equipment |
| CN109958655A (en) * | 2019-04-01 | 2019-07-02 | 青岛海尔智能技术研发有限公司 | A kind of centrifugal blower and electric appliance |
| CN111905540B (en) * | 2020-07-13 | 2022-05-13 | 上海盛通时代印刷有限公司 | Method for treating waste gas in printing process |
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| TWM287571U (en) * | 2005-09-22 | 2006-02-11 | Delta Electronics Inc | Centrifugal fan |
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| DE8909594U1 (en) * | 1989-08-10 | 1989-10-05 | Metronic Electronic Gmbh, 7210 Rottweil, De | |
| JP3018545B2 (en) * | 1991-04-11 | 2000-03-13 | 松下電器産業株式会社 | Electric blower |
| JPH06118993A (en) * | 1992-10-08 | 1994-04-28 | Kokusai Electric Co Ltd | Voiced/voiceless decision circuit |
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2009
- 2009-09-11 JP JP2009210072A patent/JP4894900B2/en not_active Expired - Fee Related
-
2010
- 2010-07-27 TW TW099124719A patent/TWI418709B/en not_active IP Right Cessation
- 2010-08-30 EP EP10174481A patent/EP2295817A3/en not_active Withdrawn
- 2010-09-10 CN CN2010205268837U patent/CN201851371U/en not_active Expired - Fee Related
- 2010-09-10 CN CN2010102824741A patent/CN102022349A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS562498A (en) * | 1979-06-18 | 1981-01-12 | Matsushita Electric Ind Co Ltd | Electric fan |
| JPH06108993A (en) * | 1992-09-30 | 1994-04-19 | Matsushita Electric Ind Co Ltd | Impeller for motor-driven blower |
| EP1455094A1 (en) * | 2003-03-04 | 2004-09-08 | Ziehl-Abegg AG | Radial flow impeller |
| US20050169750A1 (en) * | 2004-02-03 | 2005-08-04 | Lg Electronics Inc. | Air-blowing apparatus of cleaner |
| TWM287571U (en) * | 2005-09-22 | 2006-02-11 | Delta Electronics Inc | Centrifugal fan |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2295817A3 (en) | 2012-03-14 |
| JP4894900B2 (en) | 2012-03-14 |
| CN201851371U (en) | 2011-06-01 |
| TW201109532A (en) | 2011-03-16 |
| CN102022349A (en) | 2011-04-20 |
| EP2295817A2 (en) | 2011-03-16 |
| JP2011058442A (en) | 2011-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |