JPS59190498A - Vane for centrifugal blower - Google Patents

Abstract

PURPOSE:To reduce the wear of a vane for a centrifugal blower, by dividing the vane into an inner and an outer vanes and providing a gap between them to allow some of gas to pass through the gap, so that the quantity of dust passing on the tip of the outer vane, at which the circumferential speed is the highest, is decreased. CONSTITUTION:A vane 4 is divided into an inner vane 4a and an outer vane 4b. The inner end of the outer vane 4b is placed upstream to the outer end of the inner vane 4a as to the direction of gas flow, and a prescribed gap G is defined between the inner end of the outer vane and the outer end of the inner vane. The density of wearing dust contained in the gas becomes high near the front of the inner vane 4a as the gas flows on the front, so that the gas with the high density of dust passes through the gap G and the gas with the low density of dust flows on the front of the outer vane 4b. For that reason, the wear of the outer end b'' of the outer vane 4b is minimized despite the high circumferential speed of the gas at the outer end b''. The wear of the inner vane 4a due to the passing of the gas with the high density of dust does not matter, because the circumferential speed on the vane is low.

Description

【発明の詳細な説明】 本発明は送風機、１、テに摩耗性ダストを含む気体を送
風する遠心送風機の羽根の構成に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a configuration of a blade of a centrifugal blower that blows gas containing abrasive dust to the blower.

本来、ダストを含む気体を送風する遠心送風機の羽根は
、その周速度か最大である先端部に於いてマクロ的には
切削作用によるエロージョンを生ずるｏＪ能性か極めて
高い。Originally, the blades of a centrifugal blower that blows gas containing dust have extremely high oJ potential, which causes erosion due to cutting action at the tip end where the circumferential velocity is maximum.

従来、この種のエロージョン対策としては、主として羽
根の材質や板厚の変更、各種方法による表面硬化、摩耗
用ライナーの取１）　１；１け等、羽根自体の形状や構
造を極力変更しない方法で行なっていた。Conventionally, countermeasures against this type of erosion have mainly included changing the material and plate thickness of the blade, hardening the surface using various methods, and removing a wear liner. It was done at

しかし、Ｊ二連のような従来方法によるエロージョン対
策は、極めて細心の注意を払って製作してもなＪ）静的
或いは動的バランスを崩す虞れかあったり、始動トルク
の増加をもたらして設（ｉｉｉｆ費や運転費か増加する
秀の問題点があった。However, conventional erosion countermeasures such as the J2 series, even with extreme care, may cause the static or dynamic balance to be disrupted, or may result in an increase in starting torque. There was a problem with the increase in installation costs and operating costs.

本発明は、」二記従来の問題点を解消するためになされ
たもので、その目的とするところは、羽根自体の構成を
工夫することにより、羽根先端部のエロージョンを効果
的に防！トすることかできる遠心送風機の羽根を提供す
るにある。The present invention has been made in order to solve the problems of the conventional art described in section 2.The purpose of the present invention is to effectively prevent erosion of the tip of the blade by devising the structure of the blade itself. We offer centrifugal blower blades that can be used in a variety of ways.

即ち、本発明の遠心送風機の羽根は、一枚の羽根を内側
羽根と外側羽根に分割し、該外側羽根の内端部を内側羽
根の外端部に対して所要の間隙をもって回転方向の前方
側に位置せしめたことを特徴とするものである。That is, in the blade of the centrifugal blower of the present invention, one blade is divided into an inner blade and an outer blade, and the inner end of the outer blade is placed forward in the rotational direction with a required gap from the outer end of the inner blade. It is characterized by being located on the side.

以下、本発明の一実施例に−〕いて図面を参ｊｉｌ　Ｌ
なから説明する。Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Let me explain from the start.

ｔ５１図において、１はハフであって主軸（図示せず）
に固定されている。該ハフ１の一側には円板状の主板２
が取り（＝Ｉけられており、一体向に回転するようにな
っている。該主板２に対し所定の間隔をあけて側板３か
配設されており、その中央部には気体の吸込１」３ａか
開設されている。In the t51 diagram, 1 is Hough and the main axis (not shown)
is fixed. A disk-shaped main plate 2 is provided on one side of the huff 1.
A side plate 3 is provided at a predetermined distance from the main plate 2, and a gas suction 1 is installed in the center of the side plate 3. ” 3a has been established.

−１−記主板２と側板３との間には数枚の羽根４か取イ
′Ｎｊけられており、各羽根・４は内側羽根４ａと外側
羽根１１）〕とに分割されている。該外側羽根４　Ｉ）
は前記内側羽根４ａに対して、その回転方向Ａの前方側
に位置ｒると共に、前記外側羽根４）〕の内端部１１’
　と内側羽根４ａの外端部ａ′は間隙Ｇをあげた状態で
、相互にオーバーラツプしている。本実施例では、実験
的に間隙Ｇを板厚ｔに略等しく、また板厚１の約２倍の
長さでオーバーランプさせて設計されている。-1- Several blades 4 are installed between the main plate 2 and the side plate 3, and each blade 4 is divided into an inner blade 4a and an outer blade 11). The outer blade 4 I)
is located on the front side in the rotational direction A with respect to the inner blade 4a, and is located at the inner end 11' of the outer blade 4).
and the outer end a' of the inner blade 4a overlap with each other with a gap G being increased. In this embodiment, the gap G is experimentally designed to be approximately equal to the plate thickness t, and the gap G is overlamped by a length approximately twice the plate thickness 1.

本実施例の羽根は以上のように構成されているので、こ
れを第２図で矢印へ方向に回転させると、１及込１−’
、１３　ａから吸い込まれたガス１−を含む気体は羽根
４と羽根１４との間の流路に入る。該流路に入った気体
はまず内側羽根４ａの前側に沿って流れ、その一部即ち
内側羽根１１．　ａの前側表面付近を流れる気体は前記
間隙（：を通り抜けて外側羽根４．　ｂの裏側から吐出
されると共に、残りの気体は上記外側羽根４ｂの前側を
通って更に遠心力を与えられて吐出される。Since the blade of this embodiment is constructed as described above, when it is rotated in the direction of the arrow in FIG.
, 13a enters the flow path between the blades 4 and 14. The gas that has entered the flow path first flows along the front side of the inner blade 4a, and a portion thereof, that is, the inner blade 11. The gas flowing near the front surface of the outer vane 4b passes through the gap and is discharged from the back side of the outer vane 4b, while the remaining gas passes through the front side of the outer vane 4b and is further discharged by applying centrifugal force. be done.

気体に含まれる摩耗性ゲスｌは、内側羽根４ａの前側を
通過する際にはその表面（＝１近で密度か大おくなって
いるので、このダスト密度の大きい気体が間隙Ｇから通
り抜けることになり、］−記配性羽根旧〕の前面にはダ
スト密度か比較的小さい気体か流れることになる。従っ
て、その周速度か大きいにもかかわらず外側羽根４１）
の外端部１〕″の摩耗量は最小限で済むことになり、一
方、間隙（：を通過する気体に晒される内側羽根４ａの
外端部Ｕ′は−に配性側羽根４１〕の外端部Ｉ〕″に比
べて周速度が小さいので、密度の高いダストが通過して
も摩耗はそれほど問題にならない。When the abrasive dust L contained in the gas passes through the front side of the inner vane 4a, its density is large near the surface (=1), so the gas with a high dust density passes through the gap G. Therefore, gas with a relatively low dust density will flow in front of the outer blade 41), even though its circumferential velocity is large.
On the other hand, the outer end U' of the inner blade 4a, which is exposed to the gas passing through the gap (), is reduced to a minimum. Since the circumferential speed is lower than that of the outer end I]'', wear does not pose much of a problem even if high-density dust passes through it.

次に、」二記実施例の羽根の効果を確認するため従来の
羽根と比較した実験例を示す。Next, in order to confirm the effect of the blade of Example 2, an experimental example will be shown in which it was compared with a conventional blade.

逢Ｊ１ご ガス発生源及び含塵量： 木屑燃焼ボイラ＋　３　ｇ／　Ｎ　ｍ　１羽根車周速度
：８（ｉｍ／ｓ 羽根形状：　後向き羽根 羽根祠質：１）従来の梓通鋼板製羽根 １１）従来の普通鋼板製羽根の 表面に約２＋＋＋ｍ厚で７ラツクス 入りワイヤー溶接棒の肉盛を 施行 ピッカー又硬度約６００に８ｒ／＋ｏｍ？１１１）本実
施例の瞥通鋼板製 羽根 羽根の種類による運転時間と羽根先端部の摩耗量　　　
　・を以下に表示する。Ai J1 Gas source and dust content: Wood chips combustion boiler + 3 g/N m 1 impeller circumferential speed: 8 (im/s) Blade shape: Backward facing blade Blade quality: 1) Conventional Azusa Tsutsu steel plate blade 11 ) A wire welding rod with 7 lux core is applied to the surface of a conventional ordinary steel blade with a thickness of about 2+++ m.The picker also has a hardness of about 600 and 8r/+om? 111) Operating time and amount of wear on the tip of the blade depending on the type of vane made of transparent steel plate in this example
・Displayed below.

□ □ ４撃： １）の羽根に比べて１１）の羽根は約３倍の耐摩耗量を
示しでいるが、耐摩耗肉盛溶接を施行することにより約
５割の羽根製作時間の増加を米たしてＵ）る。□ □ 4 strokes: Compared to the blade in 1), the blade in 11) shows about three times the wear resistance, but by applying wear-resistant overlay welding, the manufacturing time for the blade can be increased by about 50%. Let's make rice.

これに対し、本実施例１ｉｉ）の羽根の製作時間は１）
の羽根に対し約２割増加するものの、耐摩耗量に関して
従来の羽根ｌ）及び１１）より格段の優秀性が認められ
る。On the other hand, the manufacturing time of the blade in Example 1ii) is 1)
Although the wear resistance is increased by about 20% compared to the conventional blades 1) and 11), it is recognized that the wear resistance is significantly superior to the conventional blades 1) and 11).

」二記実施例では後向き羽根について説明したが、本発
明はこれに限定するものではなく、後向ぎ羽田あるいは
前向き羽根であってもよく、これらのＪ″Ｊ根は湾曲し
ていてもよい。また、内側羽根と外叫羽根との傾斜角か
多少に相異していてもよい。In the second embodiment, the backward-facing blade was explained, but the present invention is not limited to this, and the blade may be a backward-facing blade or a forward-facing blade, and these J″J roots may be curved. .Furthermore, the inclination angles of the inner blade and the outer blade may be slightly different.

さらに、−Ｅ記芙施例では内側羽根の外端部と外則羽根
の内端部とをオーバーランプさ・せた状態でその間に間
隙を形成しているが、本発明はこれに仮定するものでは
なく、内側羽根の表面に沿って・ガこれる気体の一部か
間隙を通過し得るよう、外側羽根の内端部か内側羽根の
外端部に月して所要の“１１］隙をもって回転方向に関
し少なくとも１１；」力価に立置していれはよい。Furthermore, in the embodiment described in -E, the outer end of the inner blade and the inner end of the outer blade are overlapped to form a gap therebetween, but the present invention assumes this. The required "11" gap is provided at the inner end of the outer vane or at the outer end of the inner vane so that some of the gas flowing along the surface of the inner vane can pass through the gap. It may be placed upright with a force of at least 11" with respect to the direction of rotation.

更にまた、本発明の間隙は羽根の幅方向に沿って一様で
ある必要はなく、例えはその慣性力によリガス）（且か
Ｊ′１寄り易い主板側の間隙量を広くしてもよく、或い
は間隙そのものを羽根の幅方向に関し多少傾斜させても
よい。Furthermore, the gap in the present invention does not need to be uniform along the width direction of the blade; for example, it is possible to increase the gap amount on the main plate side where J'1 tends to shift. Alternatively, the gap itself may be slightly inclined in the width direction of the blade.

尚、本発明では内側羽根の外端部と外側羽根の内端部と
の間の間隙により若−１−の効率酸ドか認められるか、
その代「率は設計仕様や運転条件にもよるものの略１〜
２％の低下であり、実用」、それはとの障）ｌｉ：　ｌ
こなっ−こいない。In addition, in the present invention, the gap between the outer end of the inner blade and the inner end of the outer blade allows for an efficiency of -1-
Although the rate depends on the design specifications and operating conditions, the rate is approximately 1~
2% decrease, which is an obstacle to practical use) li: l
This isn't here.

本発明は、以−１ｘのように一枚の羽根を内側羽根と外
側羽根とに分割し、その開に間隙を形成して気１４（の
一部を通過せしめるようにしたので、周速度か最大の外
側羽根の先端部を通過するダスト量を少なくして、その
摩耗量を極力抑えることが出来るだけでなく、既存の羽
根材料を特別に加工処理することなく極めて安価に製作
することが出来る等の効果かある。In the present invention, one blade is divided into an inner blade and an outer blade as shown in 1x below, and a gap is formed in the opening to allow part of the air 14 to pass through, so that the circumferential speed can be increased. Not only is it possible to reduce the amount of dust that passes through the tip of the largest outer blade, minimizing the amount of wear, but it can also be manufactured at an extremely low cost without any special processing of existing blade materials. There are similar effects.

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

第１図は本発明の遠心送風機の羽根の−・実施例を取（
＝１は羽根車の横断面図、第２図は第１図の１−１線に
沿った半断面図である。 １・・・ハフ、２・主板、３・・側板、３ａ・・・吸込
１］１、・・１・・・羽根、・１ａ・・・内側羽根、ａ
′・・・外端部、４１〕・・・外側羽根、ｂ′・・・内
端部、１〕″・・・外端部、ノ＼・・・回転力向、（９
・間隙、Ｌ・・板厚。 特許出願人　ガデリウス株式会社Figure 1 shows an embodiment of the centrifugal blower blade of the present invention.
1 is a cross-sectional view of the impeller, and FIG. 2 is a half-sectional view taken along line 1-1 in FIG. 1. 1... Hough, 2. Main plate, 3... Side plate, 3a... Suction 1] 1,... 1... Blade, 1a... Inner blade, a
′...outer end, 41]...outer blade, b'...inner end, 1]''...outer end, ＼...rotational force direction, (9
・Gap, L...Plate thickness. Patent applicant Gadelius Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 一枚の羽根を内側羽根と外側羽根に分割すると共に、該
外側羽根の内端部を内側羽根の外端部に月して所要の間
隙をちって回転方向の前方側に位置せしめたことを特徴
とする遠心送風機の羽根。One blade is divided into an inner blade and an outer blade, and the inner end of the outer blade is aligned with the outer end of the inner blade, leaving a required gap and positioned on the front side in the direction of rotation. Features centrifugal blower blades.