JP4834430B2 - Centrifugal blower with reduced stress concentration on the junction of the blades - Google Patents
Centrifugal blower with reduced stress concentration on the junction of the blades Download PDFInfo
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- JP4834430B2 JP4834430B2 JP2006065156A JP2006065156A JP4834430B2 JP 4834430 B2 JP4834430 B2 JP 4834430B2 JP 2006065156 A JP2006065156 A JP 2006065156A JP 2006065156 A JP2006065156 A JP 2006065156A JP 4834430 B2 JP4834430 B2 JP 4834430B2
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Description
この発明は、各種送排気、塗装設備、集塵装置、工場等の換気設備として使用される後向き羽根車を有する遠心送風機に関する。 The present invention relates to a centrifugal blower having a rear-facing impeller that is used as a ventilation facility in various air supply / exhaust, painting facilities, dust collectors, factories, and the like.
遠心送風機の後向き羽根車は、羽根板の出口部が半径方向に向いており、羽根板の出口角度は後向き（３０°〜６０°）であり、入口部から出口部に向けて曲線状に成型された羽根板が、等厚の主板、側板に溶接又はリベット締めされている。さらに、主板は羽根車入口の流路を形作るように形成されたハブに溶接又はリベット締めされる。また、羽根車入口には、シュラウドと呼ばれる円環部が、羽根板の外縁部に溶接等により接続され、羽根車への空気の導入を円滑にしている。
前記羽根板とシュラウドとの接続部には、羽根車の回転に伴う応力集中が生じやすく、しばしば羽根板とシュラウドとの隔離又は破損が生じる。これを防止し、且つ羽根車の小型化、高性能化を図るため、各羽根板を屈曲させたり（特許文献１）、羽根板の肉厚を上げたり（特許文献２）、夫々の羽根板の中間に補強リブを追加する構成としている。しかしこの場合、羽根車の重量や材料費の増加をもたらす。また、羽根車の重量の増加は、羽根車の慣性重量の増加につながり、送風機運転時の起動時間が長くなり、汎用の電動機トルクでは起動できないという問題や、汎用の電動機過負荷保護装置では、誤作動による起動不良が発生するという問題がある。さらに、送風機を起動可能にするために、特殊な電動機や電動機過負荷保護装置を使用することで、省資源、省エネルギーの面で不経済になるという問題があった。 Stress concentration accompanying the rotation of the impeller tends to occur at the connecting portion between the blade plate and the shroud, and the blade plate and the shroud are often separated or broken. In order to prevent this and to reduce the size and performance of the impeller, each blade is bent (Patent Document 1) or the thickness of the blade is increased (Patent Document 2). It is set as the structure which adds a reinforcement rib in the middle. In this case, however, the weight and material cost of the impeller are increased. In addition, the increase in the weight of the impeller leads to an increase in the inertia weight of the impeller, the startup time during fan operation becomes longer, and the problem that it cannot be started with a general-purpose motor torque, There is a problem that starting failure occurs due to malfunction. Furthermore, there is a problem that it becomes uneconomical in terms of resource saving and energy saving by using a special motor or a motor overload protection device in order to make the blower startable.
そこでこの発明では、遠心送風機の後向き羽根車において、シュラウドとの接続部近傍の羽根板端縁部に、所定形状の切欠き部を設ける。この切欠き部の形状は、互いに平行する側壁部と、該両側壁部を互いに連結した湾曲底部とからなっており、それ自体が局部的な応力集中により、その部分から、破断が拡大したりしないような形状になっている。 Therefore, according to the present invention, in the rear impeller of the centrifugal blower, a notch portion having a predetermined shape is provided at the edge of the blade plate near the connection portion with the shroud. The shape of this notch part is composed of side wall parts parallel to each other and a curved bottom part connecting the both side wall parts to each other. It has a shape that does not.
切欠き部の深さは、羽根板とシュラウドとの接続部から切欠き部までの距離の２乃至３倍の範囲内とし、且つその湾曲底部の曲率半径は、切欠き部の応力集中係数が２．５乃至３．５の範囲内になるように決定される。また、羽根板とシュラウドとの接続部から切欠き部までの距離は、運動性能に影響を与えず、且つ羽根板とシュラウドとの接続部に作用する応力集中を軽減するように決定する。 The depth of the notch is in the range of 2 to 3 times the distance from the connecting portion between the blade and the shroud to the notch, and the curvature radius of the curved bottom is the stress concentration factor of the notch. It is determined to be within the range of 2.5 to 3.5. Further, the distance from the connection portion between the blade plate and the shroud to the cutout portion is determined so as not to affect the motion performance and to reduce the stress concentration acting on the connection portion between the blade plate and the shroud.
この発明の遠心送風機は以上のように構成したので、羽根車入口接続部分の応力の流れ込み分布が変わり、この部分への応力集中を軽減させることができる。そのために、応力集中に耐えるために羽根板の肉厚化等の検討を行う必要がなく、従来の羽根車の肉厚で十分強度を保つことができる。その結果、羽根車の軽量化により、慣性質量が低く保たれるので、起動トルクが不足したり、電動機過負荷保護装置の誤作動など、従来品に付随した問題点が解消されるほか、省エネルギーとなり、経済的効果を得ることができる。 Since the centrifugal blower of the present invention is configured as described above, the stress flow distribution at the impeller inlet connection portion is changed, and the stress concentration on this portion can be reduced. Therefore, it is not necessary to examine the thickness of the blades in order to withstand the stress concentration, and sufficient strength can be maintained with the wall thickness of the conventional impeller. As a result, the weight of the impeller keeps the inertial mass low, eliminating problems associated with conventional products such as insufficient starting torque and malfunctioning of the motor overload protection device, as well as energy savings. Thus, an economic effect can be obtained.
この発明の遠心送風機の羽根車の一実施例を図1に示す。後向き羽根車１は羽根板ブレード２、シュラウド３、インペラディスク４及びインペラハブ５とからなる。この羽根板２はシュラウド３との接合部近傍の外縁部に切欠き部6が設けられる。
One embodiment of the impeller of the centrifugal blower of the present invention is shown in FIG. The rear impeller 1 includes a blade blade 2, a shroud 3, an
切欠き部６の形状は、互いに平行する側壁部７と、該両側壁部を互いに連結した湾曲底部８とからなる。この切欠き部の基本形状、及び変形例を、図２A、B及びCに示す。切欠き深さd、及びブレードとシュラウドとの接続部から切欠き部までの距離
については、次のような式１の関係が成り立つ。
The shape of the notch 6 includes a side wall 7 that is parallel to each other and a curved bottom 8 that connects both side walls to each other. 2A, 2B, and 2C show the basic shape of the notch and its modification. Notch depth d and distance from notch to blade / shroud connection
With respect to, the following equation 1 holds.
また、湾曲底部の曲率半径ρは、切欠き部の応力集中係数αが２．５乃至３．５の範囲内になるように決定される。ブレードとシュラウドとの入口接続部の作用応力σAと切欠き深さｄとの関係を 式2に示す。但しσ０は、切欠きが無い場合のブレードとシュラウドとの入口接続部の作用応力を示す。 In addition, the curvature radius ρ of the curved bottom is determined so that the stress concentration coefficient α of the notch is in the range of 2.5 to 3.5. Equation 2 shows the relationship between the applied stress σA at the inlet connection between the blade and the shroud and the notch depth d. However, σ 0 indicates the acting stress at the inlet connection portion between the blade and the shroud when there is no notch.
切欠き深さｄの影響による応力集中の軽減度合いは、応力集中軽減グラフとして図３に示す。さらに、この発明の、ブレードに所定の切り欠き部を設けた羽根車と、従来型の羽根車との応力集中の度合いを図４に示す。このように、ブレードの板厚を従来の切欠きが無い場合に比べて２５〜３０％程度薄くしても、ブレードとシュラウドの入口接続部分の作用応力σは、切欠きを設けることで、３０〜４０％軽減される。 The degree of stress concentration reduction due to the influence of the notch depth d is shown in FIG. 3 as a stress concentration reduction graph. Furthermore, FIG. 4 shows the degree of stress concentration between the impeller having a predetermined notch in the blade and the conventional impeller according to the present invention. Thus, even if the plate thickness of the blade is reduced by about 25 to 30% compared to the case where the conventional notch is not provided, the acting stress σ at the inlet connection portion of the blade and the shroud is 30 Reduced by ~ 40%.
この発明の送風機は以上のように構成したので、後向き羽根車を有する遠心送風機において、羽根板が、等厚の主板、側板に溶接又はリベット締めする場合、この接合部分にかかる応力集中を、比較的簡単な構成によって軽減させることができるので、比較的大型の各種送排気、塗装設備、集塵装置、工場等の換気設備として、広い用途に適用することができる。 Since the blower of the present invention is configured as described above, in the centrifugal blower having the rear impeller, when the blade plate is welded or riveted to the main plate and the side plate of equal thickness, the stress concentration applied to the joint portion is compared. Since it can be reduced by a simple configuration, it can be applied to a wide range of use as a relatively large variety of air supply / exhaust, painting equipment, dust collectors, and ventilation equipment in factories.
１ 後向き羽根車
２ 羽根板ブレード
３ シュラウド
４ インペラディスク
５ インペラハブ
６ 切欠き部
DESCRIPTION OF SYMBOLS 1 Backward impeller 2 Blade blade 3 Shroud 4
Claims (3)
前記後向き羽根車の羽根板の、シュラウドとの入口接続部に繋がる外縁部に、前記入口接続部から離間し、前記入口接続部からの距離に対応する切欠き深さを有し、前記入口接続部における作用応力を軽減する切欠き部を設けた遠心送風機。 Oite the centrifugal fan having backward impeller,
An outer edge portion of the blade of the rear impeller connected to the inlet connection portion with the shroud has a notch depth spaced from the inlet connection portion and corresponding to a distance from the inlet connection portion, and the inlet connection centrifugal blower provided with a cutout portion to reduce the effect stress in the part.
それぞれが前記外縁部に連続し互いに平行する側壁部と、該両側壁部を互いに連結した湾曲底部とを有する請求項１または２に記載の遠心送風機。 The notch is
And the side wall portion, each of which parallel continuous to each other in the outer edge portion, a centrifugal blower according to 請 Motomeko 1 or 2 and a curved bottom which is connected to both said side wall portions to each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006065156A JP4834430B2 (en) | 2006-03-10 | 2006-03-10 | Centrifugal blower with reduced stress concentration on the junction of the blades |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006065156A JP4834430B2 (en) | 2006-03-10 | 2006-03-10 | Centrifugal blower with reduced stress concentration on the junction of the blades |
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| Publication Number | Publication Date |
|---|---|
| JP2007239675A JP2007239675A (en) | 2007-09-20 |
| JP4834430B2 true JP4834430B2 (en) | 2011-12-14 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59211795A (en) * | 1983-05-18 | 1984-11-30 | Hitachi Ltd | Impeller for centrifugal hydraulic machine |
| JPH0197062A (en) * | 1987-10-09 | 1989-04-14 | Canon Inc | Picture processing device |
| JPH10306797A (en) * | 1997-05-07 | 1998-11-17 | Meidensha Corp | Welding type moving blade |
| JP2003161107A (en) * | 2001-11-22 | 2003-06-06 | Mitsubishi Heavy Ind Ltd | Partition plate structure in steam turbine |
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