JPS5915696A - Centrifugal fan or centrifugal compressor - Google Patents

Abstract

PURPOSE:To prevent splitting by forcing the flow near the front end at the sideboard side of an impeller through a suction conduit having a curved face considered hydrodynamically with correspondence to the curved faces of the rear end flow path wall of a suction tube and the flow path wall at the front end section of a sideboard. CONSTITUTION:A suction conduit 300 has the downstream side of bugle-shape where the distance b1 from the cross point P between the extended line at the rear end and the front end of a vane 24 to the sideboard 23 along the front edge of the vane and the length of the front edge b1 of the vane (inlet vane length) are set to be 8%<DELTAb1/b1<=30%. The front end section of a suction conduit 300 is provided at the position DELTAr for splitting the total flow with the ratio of approximately DELTAb1/b1:(b1-DELTAb1)/b1 where the entire suction conduit 300 has a curved face considered hydrodynamically with correspondence to the curved face of the flow path wall at the front end section of a sideboard 23 of the impeller and the rear section flow path wall of a suction tube 31. Consequently the flow of the operating fluid to be produced at the front end portion at the sideboard 23 side can be sufficiently prevented from splitting.

Description

【発明の詳細な説明】 本発明は遠心送風機または遠心圧縮機の改良に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in centrifugal blowers or centrifugal compressors.

従来の遠心送風機の代表例を第１図により説明すると、
ＯＱが回転軸、（２０Ｉがボス（２１）と主板（２カと
側板Ｃ２３）と複数枚のＲ（２４Ｉとよりなる羽根車で
、ボスＣ２１）が回転軸θ（支）に固定され、ボス（２
１）と主板Ｃ；つとが例えばボルトで結合され、主ｉ　
＋２２１あるいは側板ｃ！３）と翼０イ１とが例えば溶
接により結合されている。また（３０１が羽根車（２０
１を囲む車室Ｃ３＋１１で、同車室（：（０１には吸込
管Ｃ３１）および吐出管（図示せず）が設けられている
。A typical example of a conventional centrifugal blower is explained using Figure 1.
OQ is a rotating shaft, (20I is an impeller consisting of a boss (21), a main plate (2 pieces and a side plate C23), and a plurality of R (24I, boss C21) is fixed to a rotating shaft θ (support), (2
1) and the main plate C; are connected, for example, with bolts, and the main plate C;
+221 or side plate c! 3) and the blades 0 and 1 are coupled, for example, by welding. Also (301 is the impeller (20
The vehicle compartment C3+11 surrounding the vehicle 1 is provided with a suction pipe C31 and a discharge pipe (not shown).

前記遠心送風機の運転中は、空気などの作動流体が矢印
→あるいは矢印→に従って吸込管Ｃ（１）羽根車（２０
）から車室Ｃ清白の通路ケ通って図示してない吐出管よ
り吐出される。この遠心送風機、特に羽根車の径に対し
て大流量の作動ｉｌＲ体乞取辺５ようにしたいわゆる比
速度の大きい遠心送風機においては、略円詐形またはベ
ルマウス形ゲした吸込管Ｃ３１）と羽根車（イ））の側
板い１との汁、路面の連続性をできるだけ小さな空間で
成立させる必要がある。そのため、前記吸込管Ｃ３１１
の後端部あるいは１１１１１４１ｉ（２：ｓ＋の前端部
附近において、小さな曲率半径（Ｒ＋の曲面壁ケ形成し
ている。その場合、羽根車Ｃｂ’０ｉＶＣ吸込まＪ１イ
）作動流体は、この小さな曲率半径の曲面Ｊ３−にそっ
て流れることができず１羽根車Ｃ（）１の側板（２３１
側の入り部に大きな流れの剥離が発生し、羽＃１１！ｉ
（２＋ｉ内の流れが主板１２ａ側へ偏流し、遠心送風機
全体として髪ま流計な大きくできなかったり、或は効率
低下の原因になっていた。During operation of the centrifugal blower, working fluid such as air flows through the suction pipe C (1) impeller (20
), passes through a clear passageway in the vehicle compartment C, and is discharged from a discharge pipe (not shown). This centrifugal blower, especially a centrifugal blower with a large specific speed that operates at a large flow rate relative to the diameter of the impeller, has a suction pipe C31) with a substantially circular or bellmouth shape. It is necessary to establish continuity between the impeller (a) and the side plate 1 and the road surface in as small a space as possible. Therefore, the suction pipe C311
Near the rear end or the front end of 1111141i (2:s+, a curved wall with a small radius of curvature (R+) is formed. In that case, the impeller Cb'0iVC suction J1a) The working fluid flows through this small radius of curvature. The flow cannot flow along the curved surface J3- of the radius, and the side plate (231
A large flow separation occurred at the side entrance, and feather #11! i
(The flow in 2+i was biased toward the main plate 12a, which caused the centrifugal blower as a whole to be unable to achieve a high flow rate, or to cause a decrease in efficiency.

前１１性能低下の防止対策として、羽根車（イ））の前
方にラツノξ形の吸込導管（３２ケ設けた例が見られる
（第２図参照）。この場合、ラツ・ξ形の吸込導管いと
羽根車仕切板Ｇ！９とｆより送風機の全体ケ性能的に２
分割して、羽根車の翼（２４）ス・ξンが長くなったた
めＶｒ午する流、れの不規則化を防止しており。As a measure to prevent performance deterioration, there is an example in which 32 rat-shaped ξ-shaped suction conduits are installed in front of the impeller (a) (see Figure 2).In this case, the rat-ξ-shaped suction conduit From the impeller partition plate G!9 and f, the overall performance of the blower is 2.
By dividing the impeller blades (24), the length of the blades (24) and ξ has been lengthened to prevent the flow from becoming irregular.

前述の側枦の前！７ｉＭ７／近に発生する流れの剥離を
おさ爽る効果ケある程度期待できるが、吸込導管ＣＴ／
］が羽根車の胛１３４１に流１人する作動流体をはｙ２
分ｊ！：１ｌ−ｆろ位１）？ｆに設けられており、側板
Ｃ２：９の前端部附近にを牛する局部的な流わの剥離ケ
十分に防止することができないという問題があった。In front of the aforementioned side rail! 7iM7/It can be expected to have some effect in relieving the flow separation that occurs near the suction conduit CT/
] is the working fluid flowing into the blade 1341 of the impeller y2
Minj! :1l-f loin1)? There was a problem in that it was not possible to sufficiently prevent localized peeling of the flow strips near the front end of the side plate C2:9.

木登明けｍＩ記の間（８１点に対処′１−るもので、遠
心送Ｊ戦機または遠ル？圧縮機の吸入７７及び羽柳車翼
のいず牙］か一方若しくは双方に、下流側がラツ・ξ状
に広がった吸込導管を設けろとともに、吸込導管後端部
の延長線と羽根車翼前縁との交点Ｐから羽根車翼先端ま
での羽根車翼前線に沿う長さまたは吸込導管後端部から
羽根車翼先端までの羽根ｊ＄ｆ翼前縁に沿う長さをΔｈ
　羽根車翼前Ｈの長さ？ｂ°１１、 Δｂ とするとΔｂ　のｈ　に対する比　　１／、　を８１ ％よ０も大きく、３０％よりも小さくしたことケ％琶と
する遠心送風機またをよ遠心圧縮機に係り、その目的と
する処は、羽根車の側根σ）前端部に発生する流れの剥
離な十分に防止できる改良された遠心送風機または遠心
圧縮機を供する点にある。The downstream side is located between one or both of the following points: (81 points are addressed '1-), the suction 77 of the centrifugal J-Fighter or the distant compressor, and the blade of the impeller blade] In addition to providing a suction conduit that spreads out in a radial or ξ shape, the length along the front line of the impeller blade from the intersection point P of the extension line of the rear end of the suction conduit and the leading edge of the impeller blade to the tip of the impeller blade or the back of the suction conduit. The length from the end of the blade to the tip of the impeller blade j$f is Δh
What is the length of the impeller blade front H? If b°11, Δb, then the ratio of Δb to h, 1/, is greater than 81% and smaller than 30%.It is related to a centrifugal blower or a centrifugal compressor, and its purpose is The object of the present invention is to provide an improved centrifugal blower or centrifugal compressor that can sufficiently prevent flow separation occurring at the front end of the impeller.

次に本発明の遠心送風機または遠心圧縮機ケ第６．４図
に示す一実施例により説明すると、Ｑ（１）〜ＣＪ４１
　Ｃ３０１Ｃａ１１が前記と同一の部分、（３００）が
吸入導管で、同吸入導管（３００）は下流側がラッパ状
に広がった形状に形成されている。同吸入導管（３００
）はその後端部の延長線と翼（２４）の前縁どの交点Ｐ
かも側根シ３）までの翼前縁に沿った距離Δｂが翼の前
縁の長さ（入口翼長）ｂｌ　に対して８％くΔｂ　、　
／ｌ）　、６６０％になるように設定されている。なお
吸入導管（３０（１）は支え板（３０１）−Ｋより吸入
管Ｃ３＋１に固定されている〇また吸込導管（３００）
の前端部は、全流早を略吸込管（３１）の後端部流路壁
および羽根車の側板ｃ！：１の前端部の流路壁の曲面に
対応して流体力学的に考慮された曲面をもっている◇ 本発明の遠心送風機または遠心圧縮機は前記のよ５に構
成されており、吸込導管（３００）により羽根車（２０
（の側板（２３１側の前端部に発生’ｆる作動流体の流
れの剥離を十分に防止できるので、遠心送風機または遠
心圧縮機、の効率向上或いは大流量化が可能となる。な
お第５図は、Δｂ１／、の種々の値に対する送風機効率
の向上率（Δη）の実験結果である。Next, the centrifugal blower or centrifugal compressor of the present invention will be explained using an embodiment shown in Fig. 6.4. Q(1) to CJ41
C301Ca11 is the same part as above, and (300) is a suction conduit, and the suction conduit (300) is formed in a shape that widens in a trumpet shape on the downstream side. The same suction conduit (300
) is the intersection point P of the extension line of the rear end and the leading edge of the wing (24)
The distance Δb along the leading edge of the wing to the side root 3) is 8% of the length of the leading edge of the wing (inlet blade length) bl,
/l), 660%. In addition, the suction conduit (30 (1) is fixed to the suction tube C3+1 from the support plate (301)-K. Also, the suction conduit (300)
The front end of the entire flow is approximately equal to the rear end flow path wall of the suction pipe (31) and the side plate of the impeller c! ◇ The centrifugal blower or centrifugal compressor of the present invention has a curved surface corresponding to the curved surface of the flow path wall at the front end of 1 ◇ The centrifugal blower or centrifugal compressor of the present invention is configured as described above 5, and has a suction conduit (300 ) by the impeller (20
Since the separation of the working fluid flow that occurs at the front end of the side plate (231 side) can be sufficiently prevented, it is possible to improve the efficiency or increase the flow rate of the centrifugal blower or centrifugal compressor. is an experimental result of the improvement rate (Δη) of blower efficiency for various values of Δb1/.

この図から明らかなように、Δｂ　　が３０％以１／ｂ
１ 下になるとΔηが著ろしく上昇し、１６％付近でピーク
に達した後再び低下し８％以下になるとΔηが従来例（
第２図（Δｈ１／ｈ１＝５０％））以下になる。As is clear from this figure, Δb is 30% or more 1/b
1, Δη increases markedly, reaches a peak around 16%, then decreases again, and when it falls below 8%, Δη increases as compared to the conventional example (
(Fig. 2 (Δh1/h1=50%)) or less.

特にΔｈ１／ｈ　　＝１０〜２６％ではΔη＝２％以上
にもなろ。In particular, when Δh1/h=10 to 26%, Δη=2% or more.

本発明は側板のない羽根車（いわゆるオープン羽根車と
いわれ、翼の先端部が微少のクリアランスケ介して静止
する壁（シュラウド壁）とγｉ面している形式）にも応
用できろ。第６図は倶Ｉ板のＹ、（い羽１４車に適用し
た例で、吸込管Ｃ３１とシュラウド壁畦とが一体に構成
され、かつ吸込管は内管（３１’）を有している。作用
効果は同じである。The present invention can also be applied to impellers without side plates (so-called open impellers, in which the tips of the blades face γi with a stationary wall (shroud wall) via a small clearance). Fig. 6 shows an example in which Y of the I plate is applied to a 14-impeller wheel, in which the suction pipe C31 and the shroud wall ridge are integrally constructed, and the suction pipe has an inner pipe (31'). .The effect is the same.

また第７．８図は、吸込導管（３００）が羽根車αηの
翼Ｃａｌの前縁（２５１に固定された他の実施例で、同
吸込導管（３００）が羽根車（２（Ｉｔの側板場）側に
近接して（偏って）設置されている。この場合にも８％
〈Δｂ１／ｂ１≦３０％である。また吸込導管（３００
）ｔ′よ下流側がラッパ状に広がった形状で、羽根車（
２（ηの側板１２：３１との間に滑かな流路を形成して
いることも同じである。本実施例では、羽根車α刀の側
板の１側の前端附近の流れが吸込導管（３００）　Ｋよ
り、側板Ｃ２３）にそうように強制されるため、この部
分で大きな流れの剥離が防止されて１羽根車内の流わが
主板（２Ｉ）側へ大きく偏流することがない０不実施例
でも、上記剥離防止作用により、遠心送風機または遠心
圧縮機、において効率向上或いは大流量化が達成される
。また本実施例では、次の利点もあイ、。Fig. 7.8 shows another embodiment in which the suction conduit (300) is fixed to the leading edge (251) of the blade Cal of the impeller αη, and the suction conduit (300) is fixed to the side plate of the impeller (2 (It). It is installed close to (biased to) the
<Δb1/b1≦30%. In addition, the suction conduit (300
) t', the downstream side is shaped like a trumpet, and the impeller (
It is also the same that a smooth flow path is formed between the side plate 12:31 of the impeller α. 300) Since K forces the side plate C23) to do so, a large separation of the flow is prevented in this part, and the flow inside one impeller does not drift significantly toward the main plate (2I). 0 Non-implementation example However, due to the above-mentioned peeling prevention effect, efficiency improvement or a large flow rate can be achieved in a centrifugal blower or centrifugal compressor. This embodiment also has the following advantages.

即ち、羽根軍団の前方（上流側）の流れに軸中心線を中
心とする旋回を与えて送風機の特性を変える（予旋回に
よる特性制御ケ行なう）場合、羽根車前流に上記旋回を
さまたげる部材がなく、予旋回による特性制御がやりや
すい。また羽根車（２０）の翼シ什の主板（２２１−側
板（２：引方向の耐振強度が向上する。That is, when changing the characteristics of the blower by giving the flow in front (upstream side) of the blade group a swirl about the axis center line (controlling the characteristics by pre-swirling), there is a member in front of the impeller that obstructs the swirl. It is easy to control the characteristics by pre-turning. In addition, the vibration resistance in the pulling direction is improved.

また第９図は、さらに他の実施例ケなしている〇この実
が６例では、羽根車（２０１に側板（２３１がなく、翼
の先端（２６１が微少すき…１ヶ介して吸込管Ｃ’ｔｌ
＋と連続するように形成さ第１たシュララド”壁（３力
と対面している。In addition, Fig. 9 shows still another example. In this case, the impeller (201) does not have a side plate (231), and the tip of the blade (261 has a slight gap... 'tl
The first Shralad wall (facing the 3 forces) is formed to be continuous with +.

また吸込管Ｃ３１１が二重の逆うッ、ｏ形管Ｃ３＋１　
（３１’）　Ｋなっている。その他の構成は第７．８図
の実施例と同じで、同様の作用効果を達成できる。In addition, the suction pipe C311 is a double reverse pipe, and the O-shaped pipe C3+1
(31') It's K. The rest of the structure is the same as the embodiment shown in FIG. 7.8, and the same effects can be achieved.

また第１Ｄ図は、さらに他の実施例２示している。この
実施例では、吸込導管（３００）が併設されており、急
な曲がり、広がりに対応できる。Further, FIG. 1D shows still another embodiment 2. In this embodiment, a suction conduit (300) is provided, which can accommodate sharp bends and expansions.

以上本発明を実施例罠ついて説明したが、勿論本発明は
このような実施例にだけ局限されろものではな（、本発
明の精神ケ逸脱しない範囲内で種々の役割の改変を施し
うるものである。Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to these embodiments. It is.

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

第１図は従来の遠心送風機の一例ゲ示−（縦断側面図、
第２図は従来の遠心送風機の他の例５′示す縦断側面図
、第６．４図は本発明に係る遠心送風機または遠心圧縮
機の一実施例を示ｆ細ＩＪ’１１側面図、第５図はその
作用説明図、第６図は、他の実施例ケ示ず縦断側面図、
第７．８図はさらに他の実１Ｋｌｉ例乞示イ縦断側面図
、第９図は、さらに他の実施例を示−を縦断側面図、第
１０図（゛よさらに他の′〕′施例ケ示す縦断側面図で
ある。 シイ）−−一羽根車翼、０１）−・−吸入管、（３（＋
０）　−−−吸込導管。 復代理人　弁理士岡本重文 外２名 第１Ｍ 關 第２図 莞３０ １−　　−　　、−、−−−− 第７図 第８図 ％ 第９図 醸１０図 手続補正書 昭和５７年８月１９日 特許庁長官　　若　杉　和　夫　　殿 １、事件の表示 昭和５７年特　許　願第１２５１２３　号２・発明の名
称　遠心送風機または遠心圧縮機３、補正をする者 事件との関係　　特　　　　　許出願人名　称（６２０
）三菱重工業株式会社 ４、復代理人 願書中 「特許法第３８条たｙし書の規定による特許出願」及び
［１，′　　特許請求の範囲に記載された発明の数　２
」を削除します。Figure 1 shows an example of a conventional centrifugal blower (longitudinal side view,
Fig. 2 is a longitudinal side view showing another example 5' of a conventional centrifugal blower, Fig. 6.4 is a side view showing an embodiment of the centrifugal blower or centrifugal compressor according to the present invention; Fig. 5 is an explanatory diagram of its operation, Fig. 6 is a longitudinal sectional side view without showing other embodiments,
FIG. 7.8 shows a longitudinal sectional side view of still another embodiment, FIG. 9 shows a longitudinal sectional side view of still another embodiment, and FIG. It is a vertical sectional side view showing an example.
0) ---Suction conduit. Sub-Agent Patent Attorney Okamoto Shigemon and two others No. 1 M Guan No. 2 Guan 30 1- - , -, --- Figure 7 Figure 8% Figure 9 Figure 10 Procedural Amendments August 19, 1982 Kazuo Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case Patent Application No. 125123 of 19812, Title of the invention Centrifugal blower or centrifugal compressor3, Person making the amendment Relationship to the case Patent applicant name ( 620
) Mitsubishi Heavy Industries, Ltd. 4, "A patent application pursuant to the provisions of Article 38 of the Patent Law" in the sub-agent application and [1,' Number of inventions stated in the claims 2
”.

Claims (1)

【特許請求の範囲】[Claims] 遠心送風機または遠心圧縮機の吸入管及び羽根車翼のい
ずれか一方若しくは双方に、下流側がラッパ状に広がっ
た吸込導管を設けるとともに、吸込導管後端部の延長線
と羽根車翼前縁との交点Ｐかも羽根車翼先端までの羽根
車翼前縁に沿う長さまたは吸込導１管後端部かも羽根車
翼先端までの羽と欠特徴とする遠心送屏機または遠心圧
縮機。In one or both of the suction pipe and impeller blade of a centrifugal blower or centrifugal compressor, a suction conduit whose downstream side widens in a trumpet shape is provided, and a line between the extension of the rear end of the suction conduit and the leading edge of the impeller blade is provided. A centrifugal filter or centrifugal compressor characterized by the length along the leading edge of the impeller blade from the intersection point P to the tip of the impeller blade, or the length along the leading edge of the impeller blade from the rear end of the suction pipe to the tip of the impeller blade.