JPH025798A - Diffuser of multiple stage centrifugal hydraulic machine - Google Patents

Diffuser of multiple stage centrifugal hydraulic machine

Info

Publication number
JPH025798A
JPH025798A JP15642788A JP15642788A JPH025798A JP H025798 A JPH025798 A JP H025798A JP 15642788 A JP15642788 A JP 15642788A JP 15642788 A JP15642788 A JP 15642788A JP H025798 A JPH025798 A JP H025798A
Authority
JP
Japan
Prior art keywords
diffuser
plate
side plate
partition plate
impeller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP15642788A
Other languages
Japanese (ja)
Inventor
Tadao Tanaka
忠男 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP15642788A priority Critical patent/JPH025798A/en
Publication of JPH025798A publication Critical patent/JPH025798A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To make manufacture of a guide blade and a diaphragm easy, by forming plural number of guide blades by means of bending a diaphragm which is formed in a plate-shape from a thin plate, from the outer circumference toward the next stage side plate. CONSTITUTION:A guide blade 17 is in a bending shape from the outer circumference 16 of a plate-shape diaphragm 13, and the diaphragm 13 and the guide blade 17 are formed in one body from a thin plate by plastic work. Further, the radius of the guide blade 17 gradually decreases toward rotating direction P of an impeller and forms a diffuser 19 in which the cross section of a flowing path toward a casing cylinder part 11 gradually increases. By connecting the diffuser 19 to a returning flowing path 15 at the end of this guide blade 17, speed head at the outlet of the impeller 2 is converted to pressure head efficiently.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、気体又は液体を取扱う多段遠心形流体機械
において羽根車の間に介装する案内羽根付の中間ディフ
ューザに係り、特に金属等の板材によって形成されるも
のに関する。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an intermediate diffuser with guide vanes that is interposed between impellers in a multi-stage centrifugal fluid machine that handles gas or liquid. It relates to things formed from plate materials.

〔従来の技術〕[Conventional technology]

第8図は従来の技術による多段遠心力送風機の半断面図
である。この図において回転自在に支承され図示しない
原動機によって回転駆動される軸1には複数の羽根車2
が間隔片3を介してナツト4によって固定されて回転す
るようになっている。
FIG. 8 is a half-sectional view of a conventional multi-stage centrifugal blower. In this figure, a plurality of impellers 2 are mounted on a shaft 1 which is rotatably supported and rotationally driven by a prime mover (not shown).
is fixed by a nut 4 via a spacing piece 3 so as to rotate.

前記羽根車2の間には仕切板53、複数の案内羽根51
及び側板52からなるディフューザ5が固定配置されて
いる。前記側板52の外周部は深絞り塑性加工されて円
筒部54が形成され、それぞれのディフューザ5の円筒
部54は嵌合されて送風機のケーシングを形成する。6
はケーシングブラケット、7は吸込口であるが送風機吐
出口は図示していない。
A partition plate 53 and a plurality of guide blades 51 are provided between the impellers 2.
A diffuser 5 consisting of a side plate 52 and a side plate 52 is fixedly arranged. The outer periphery of the side plate 52 is deep-drawn to form a cylindrical portion 54, and the cylindrical portions 54 of each diffuser 5 are fitted together to form a casing of the blower. 6
7 is a casing bracket, and 7 is a suction port, but the blower discharge port is not shown.

一般に各羽根車2の出口の流れは円周方向の成分を持つ
ので次の段の案内羽根の外周部分は半径方向に対し適宜
の角度をなし、またこの案内羽根の内周部分はほぼ半径
方向に向っていて次の段の羽根車入口への流れが適正に
なるようになっている。結局軸方向から見ると案内羽根
51はインボリュート曲線に近い適宜な曲線に形成され
る。前述のようにディフューザ5は案内羽根51、仕切
板53及び側板52からなるが、これらはそれぞれの案
内羽根51に設けた複数の突起55を仕切板53及び側
板52の突起55に対応する部分に設けた穴に挿入して
かしめるなど塑性加工等の方法で固着され、か(してデ
ィフューザ5としての部分が形成される。
Generally, the flow at the outlet of each impeller 2 has a circumferential component, so the outer circumference of the guide vane in the next stage forms an appropriate angle with respect to the radial direction, and the inner circumference of this guide vane is approximately radial. The flow towards the impeller inlet of the next stage is optimized. After all, when viewed from the axial direction, the guide vane 51 is formed into an appropriate curve close to an involute curve. As mentioned above, the diffuser 5 is composed of the guide vanes 51, the partition plates 53, and the side plates 52, and these have a plurality of protrusions 55 provided on each guide vane 51 in the parts corresponding to the protrusions 55 of the partition plate 53 and the side plates 52. It is inserted into a provided hole and fixed by a method such as plastic processing such as caulking, thereby forming a portion as the diffuser 5.

〔発明が解決しようとする課題〕 上記のような従来技術による金属板からなるディフュー
ザ5においては各1段のディフューザ毎に少くとも3種
類の部分51.52及び53を必要とし、かつ突起55
と穴との挿入にあたりこの穴に対して案内羽根51の曲
線形状と突起55の位置とを正確に合せて製作する必要
がある。しかも複数の案内羽根51を同時に仕切板53
及び側板52に対して仮組みしてからしめる必要がある
ので作業は困難を伴い、不良品が出やすく、使用中かし
めが緩み不具合を生じるなどの問題があった。
[Problems to be Solved by the Invention] In the diffuser 5 made of a metal plate according to the prior art as described above, at least three types of parts 51, 52 and 53 are required for each stage of diffuser, and the protrusion 55
When inserting the guide blade 51 into the hole, it is necessary to precisely match the curved shape of the guide vane 51 and the position of the protrusion 55 with respect to the hole. Moreover, a plurality of guide vanes 51 can be connected to the partition plate 53 at the same time.
Since it is necessary to temporarily assemble it to the side plate 52 and then tighten it, the work is difficult, there is a tendency for defective products to be produced, and there are problems such as the caulking loosening during use and causing problems.

この発明は、案内羽根と仕切板との製作を容易にしあわ
せて流体力学的に効率の良いディフューザを提供するこ
とを目的とする。
An object of the present invention is to provide a diffuser that is hydrodynamically efficient by easily manufacturing guide vanes and partition plates.

〔課題を解決するための手段〕[Means to solve the problem]

この発明は次に記載するものである。 This invention is described below.

■)側板と仕切板との間に形成される羽根車室と、前記
仕切板と次段の前記側板との間に形成される戻し流路と
をケーシング円筒部で連通ずる多段遠心形流体機械にお
いて、薄板から板状に形成した仕切板を外周端から次段
の側板に向って折り曲げて案内羽根を複数形成し、この
案内羽根の羽根車回転方向に向う始端から終端までの半
径を漸減させて前記案内羽根と前記ケーシング円筒部と
の間に断面が漸増するディフューザを形成させ、前記案
内羽根の少くとも始端近辺は前記次段の側板に当接させ
、前記案内羽根の終端で前記ディフューザと前記戻し流
路とを連通させる。
■) A multi-stage centrifugal fluid machine that communicates an impeller chamber formed between a side plate and a partition plate with a return passage formed between the partition plate and the next stage side plate through a cylindrical part of the casing. In this method, a plurality of guide vanes are formed by bending a partition plate formed into a plate shape from a thin plate from the outer peripheral end toward the next side plate, and the radius of the guide vanes from the starting end to the terminal end in the impeller rotation direction is gradually decreased. a diffuser having a gradually increasing cross section is formed between the guide vane and the casing cylindrical part, at least the vicinity of the starting end of the guide vane is brought into contact with the side plate of the next stage, and the terminal end of the guide vane is in contact with the diffuser. It communicates with the return flow path.

2)前記l)に記載するものにおいて、仕切板の外周端
が円形をなし、案内羽根の次段の側板に向う折り曲げ端
の半径が漸減する。
2) In the device described in item 1) above, the outer peripheral end of the partition plate is circular, and the radius of the bent end toward the next side plate of the guide vane gradually decreases.

〔作用] 前記の手段l)に記載するものでは、案内羽根17は板
状の仕切板13の外周端16から折り曲がる形をしてい
て、塑性加工で薄板から仕切板13と案内羽根17とが
一体的に形成される。しかも案内羽根17は羽根車回転
方向Pに半径が漸減してケーシング円筒部11との間に
流路の断面が漸増するディフューザ19を形成し、羽根
車2の出口の速度ヘッドを効率よく圧力ヘッドに変換す
る。
[Function] In the method described in the above means 1), the guide vanes 17 are bent from the outer peripheral end 16 of the plate-shaped partition plate 13, and the partition plate 13 and the guide vanes 17 are formed from a thin plate by plastic working. are integrally formed. Moreover, the guide vanes 17 form a diffuser 19 whose radius gradually decreases in the impeller rotation direction P and whose cross section of the flow path gradually increases between the guide vanes 17 and the casing cylindrical portion 11, thereby effectively converting the speed head at the outlet of the impeller 2 into a pressure head. Convert to

この場合、第1の実施例のように仕切板13の外周端1
6が円形をなし、折り曲げ端18の半径が変化するもの
と、第3の実施例のように折り曲げ端18の半径の変化
と同様に外周端16の半径が変化するものとのいずれも
が同様の前記作用を持つ。
In this case, as in the first embodiment, the outer peripheral end 1 of the partition plate 13
6 is circular and the radius of the bent end 18 changes, and the third embodiment has the same radius of the outer peripheral end 16 as the radius of the bent end 18 changes. It has the above-mentioned effect.

しかし中でも第1の実施例で代表されるもの、すなわち
前記の手段2)に記載するものでは、ディフューザ19
は羽根車室14の外周の全円周にわたって単位円周方向
長さ当り同一の面積で連通ずる(外周端16とケーシン
グ円筒部11とが同心円であるから)。したがって羽根
車室14からディフューザ19への流れのら旋用は全円
周で同一となり、流れの方向変化が均一となる。これは
ディフューザ19内の始端から終端までの速度ヘッドを
圧力ヘッドに変換する作用を均一にして効率がより良(
なる。
However, in the one represented by the first embodiment, that is, the one described in the above-mentioned means 2), the diffuser 19
communicates with the same area per unit circumferential length over the entire outer circumference of the impeller chamber 14 (because the outer circumferential end 16 and the casing cylindrical portion 11 are concentric circles). Therefore, the spiral of the flow from the impeller chamber 14 to the diffuser 19 is the same over the entire circumference, and the change in direction of the flow is uniform. This makes the effect of converting the velocity head into a pressure head uniform from the start end to the end end in the diffuser 19, resulting in better efficiency (
Become.

〔実施例〕〔Example〕

第1図は第1の実施例の断面図、第2図は第1図のn−
n断面図、第3図は第1図のIII−III断面図、第
4図は第1図のrV−IV断面図、第5図は第1図のV
−V断面図であり、第6図は第2の実施例の断面図、第
7図は第3の実施例の断面図である。なお、第1図は第
2図の1−■断面を示す。
FIG. 1 is a sectional view of the first embodiment, and FIG. 2 is a cross-sectional view of the first embodiment.
3 is a III-III sectional view in FIG. 1, FIG. 4 is an rV-IV sectional view in FIG. 1, and FIG. 5 is a V-IV sectional view in FIG.
-V sectional view, FIG. 6 is a sectional view of the second embodiment, and FIG. 7 is a sectional view of the third embodiment. Note that FIG. 1 shows a cross section taken along line 1--■ in FIG. 2.

第1の実施例において、ケーシング円筒部11と一体に
深絞り形成された側板12と板状の仕切板13との間に
は羽根車室14が形成され、軸1に間隔片3を介して固
定されて回転する羽根車2は前記羽根車室14の中に収
納される。前記仕切板13と次段の側板12aとの間に
は戻し流路15が形成される。羽根車2のの外周の出口
から圧力上昇をしかつ羽根車回転方向Pの速度成分を持
つ流体は前記戻し流路15を経て次段の図示しない羽根
車に導かれる。
In the first embodiment, an impeller chamber 14 is formed between a side plate 12 that is deep-drawn integrally with the casing cylindrical part 11 and a plate-shaped partition plate 13. The fixed and rotating impeller 2 is housed in the impeller chamber 14. A return passage 15 is formed between the partition plate 13 and the next side plate 12a. Fluid whose pressure increases from the outlet on the outer periphery of the impeller 2 and has a velocity component in the impeller rotation direction P is led to the next stage impeller (not shown) via the return flow path 15.

羽根車2の出口から戻し流路15に流体を導くために、
前記仕切板13は特別な形状を持つ。金属等の薄板によ
り形成した板状の仕切板13の外周端16は折り曲がっ
て4個の案内羽根17を形成し、その折り曲げ端18を
次段の側板12aに向けている。この実施例では仕切板
13の外周端16は軸lと同一中心を持つ円形をなす。
In order to guide the fluid from the outlet of the impeller 2 to the return channel 15,
The partition plate 13 has a special shape. The outer peripheral end 16 of the plate-shaped partition plate 13 formed of a thin plate of metal or the like is bent to form four guide vanes 17, and the bent end 18 is directed toward the next stage side plate 12a. In this embodiment, the outer peripheral end 16 of the partition plate 13 has a circular shape having the same center as the axis l.

また案内羽根17の折り曲げ端18は羽根車回転方向P
に向う始端から終端まで、図の断面■から断面■まで半
径が漸減する。したがって折り曲げ角αは変化する。案
内羽根17の始端近辺は次段の側板12aに当接し、案
内羽根17と側板12aとケーシング円筒部11とによ
って囲まれる空間はP方向に断面が漸増するディフュー
ザ19を形成して前述の羽根車室14の外周と全円周に
わたって連通し、ディフューザ19の終端、すなわち案
内羽根17の終端は前述の戻し流路15と連通ずる。
Further, the bent end 18 of the guide vane 17 is bent in the impeller rotation direction P.
From the starting end toward the end, the radius gradually decreases from cross section ■ to cross section ■ in the figure. Therefore, the bending angle α changes. The vicinity of the starting end of the guide vane 17 contacts the side plate 12a of the next stage, and the space surrounded by the guide vane 17, the side plate 12a, and the casing cylindrical part 11 forms a diffuser 19 whose cross section gradually increases in the P direction, and the above-mentioned impeller It communicates with the outer periphery of the chamber 14 over the entire circumference, and the end of the diffuser 19, that is, the end of the guide vane 17, communicates with the aforementioned return flow path 15.

この形のものは仕切板13から案内羽根17を深絞り形
成し、外周から押し曲げ加工でαを変化させる。
In this type of guide blade 17 is formed by deep drawing from the partition plate 13, and α is changed by pressing and bending from the outer periphery.

図のように案内羽根17の終端近辺の折り曲げ端18は
側板12aと当接させないでその隙間を戻し流路への連
通の補助としてもよい。こうすると戻し流路15におけ
る流れは半径方向の成分(求心)がより増加して次段の
羽根車への流入角が理想に近ずく。案内羽根17の折り
曲げ端18の数個所を次段の側板12aに溶接20又は
従来の例のようにかしめて組立に便利にするとよい。
As shown in the figure, the bent end 18 near the end of the guide vane 17 may not be brought into contact with the side plate 12a, but the gap may be used to return and assist communication with the flow path. In this way, the radial component (centripetal) of the flow in the return passage 15 increases, and the inflow angle to the next stage impeller approaches the ideal. It is preferable to weld 20 or caulk the bent ends 18 of the guide vanes 17 to the next stage side plate 12a as in the conventional example to facilitate assembly.

また図示しないが、始端のαを負にしてその折り曲げ端
18をケーシング円筒部11に内接させて中心位置決め
が容易になるようにしてもよい。更にケーシング円筒部
11に内側に向けて環状に突出させ、次段の側板12a
の外周部との間に前記内接する部分を挟んでもよい。
Although not shown, α at the starting end may be made negative so that the bent end 18 is inscribed in the casing cylindrical portion 11 to facilitate center positioning. Further, the casing cylindrical portion 11 is made to protrude inward in an annular shape, and the next side plate 12a is attached.
The inscribed portion may be sandwiched between the outer circumferential portion and the outer peripheral portion of the inscribed portion.

第2の実施例を示す第6図は第1図のほぼm−■断面近
くに対応するものを示し、案内羽根17aは軸を含む断
面においても軸方向に曲線を持ち、流れにより適した形
状を持つようにできる。
FIG. 6 showing the second embodiment corresponds almost to the m--■ cross section of FIG. It can be made to have .

第3の実施例を示す第6図においては、案内羽根17b
の軸を含むいずれの断面もα=Oとし、仕切板13の外
周端16は折り曲げ端18と同様に半径を変化させる。
In FIG. 6 showing the third embodiment, the guide vane 17b
Any cross section including the axis is set to α=O, and the radius of the outer peripheral end 16 of the partition plate 13 changes in the same way as the bent end 18.

この形のものは仕切板13から案内羽根17を深絞りで
形成する工程が単純になる。
This shape simplifies the process of forming the guide vanes 17 from the partition plate 13 by deep drawing.

〔発明の効果〕〔Effect of the invention〕

この発明は、側板と仕切板との間に形成される羽根車室
と、前記仕切板と次段の前記側板との間に形成される戻
し流路とをケーシング円筒部で連通ずる多段遠心形流体
機械において、薄板から板状に形成した仕切板を外周端
から次段の側板に向って折り曲げて案内羽根を複数形成
し、この案内羽根の羽根車回転方向に向う始端から終端
までの半径を漸減させて前記案内羽根と前記ケーシング
円筒部との間に断面が漸増するディフューザを形成させ
、前記案内羽根の少くとも始端近辺は前記次段の側板に
当接させ、前記案内羽根の終端で前記ディフューザと前
記戻し流路とを連通させるようにしたので、案内羽根と
ケーシング円筒部との間に形成されるディフューザは羽
根車の出口における速度ヘッドを圧力ヘッドに変換して
流体機械の効率が向上し、しかも案内羽根は羽根車室の
一構成要素である仕切板から薄板の塑性加工で簡単に一
体形成できるという効果があり、流体機械の特性が向上
して、騒音が低下し、部品の形成と組立が簡単になると
いう効果がある。
This invention provides a multi-stage centrifugal type in which an impeller chamber formed between a side plate and a partition plate and a return passage formed between the partition plate and the next stage side plate are communicated through a cylindrical part of a casing. In fluid machinery, a plurality of guide vanes are formed by bending a partition plate formed into a plate shape from a thin plate from the outer peripheral edge toward the next side plate, and the radius from the starting end to the ending end of the guiding vane in the impeller rotation direction is A diffuser whose cross section gradually increases is formed between the guide vane and the casing cylindrical portion, at least the vicinity of the starting end of the guide vane is brought into contact with the side plate of the next stage, and the end of the guide vane is brought into contact with the side plate of the next stage. Since the diffuser and the return flow path are communicated with each other, the diffuser formed between the guide vane and the casing cylinder converts the velocity head at the outlet of the impeller into a pressure head, improving the efficiency of the fluid machine. In addition, the guide vanes can be easily formed integrally with the partition plate, which is a component of the impeller chamber, by plastic processing of a thin plate, improving the characteristics of fluid machinery, reducing noise, and making it easier to form parts. This has the effect of simplifying assembly.

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

第1図は第1の実施例の断面図、第2図は第1図のII
−II断面図、第3図は第1図のトl断面図、第4図は
第1図のrV−IV断面図、第5図は第1図のV−V断
面図であり、第6図は第2の実施例の断面図、第7図は
第3の実施例の断面図であり、第8図は従来の技術例の
断面図である。 1・・・軸、2・・・羽根車、5.19・・・ディフュ
ーザ、51.17・−・案内羽根、52,12.12a
 ・=側板、53.13・・・仕切板、15・・・戻し
流路。
Figure 1 is a sectional view of the first embodiment, Figure 2 is II of Figure 1.
-II sectional view, FIG. 3 is a tol sectional view in FIG. 1, FIG. 4 is an rV-IV sectional view in FIG. 1, FIG. 5 is a V-V sectional view in FIG. The figure is a sectional view of the second embodiment, FIG. 7 is a sectional view of the third embodiment, and FIG. 8 is a sectional view of a conventional technique. 1... Shaft, 2... Impeller, 5.19... Diffuser, 51.17... Guide vane, 52, 12.12a
・=Side plate, 53. 13... Partition plate, 15... Return channel.

Claims (1)

【特許請求の範囲】 1)側板と仕切板との間に形成される羽根車室と、前記
仕切板と次段の前記側板との間に形成される戻し流路と
をケーシング円筒部で連通する多段遠心形流体機械にお
いて、薄板から板状に形成した仕切板を外周端から次段
の側板に向って折り曲げて案内羽根を複数形成し、この
案内羽根の羽根車回転方向に向う始端から終端までの半
径を漸減させて前記案内羽根と前記ケーシング円筒部と
の間に断面が漸増するディフューザを形成させ、前記案
内羽根の少くとも始端近辺は前記次段の側板に当接させ
、前記案内羽根の終端で前記ディフューザと前記戻し流
路とを連通させることを特徴とする多段遠心形流体機械
のディフューザ。 2)特許請求の範囲第1項記載の多段遠心形流体機械の
ディフューザにおいて、仕切板の外周端が円形をなし、
案内羽根の次段の側板に向う折り曲げ端の半径が漸減す
ることを特徴とする多段遠心形流体機械のディフューザ
[Claims] 1) An impeller chamber formed between a side plate and a partition plate is communicated with a return passage formed between the partition plate and the side plate of the next stage through a cylindrical part of the casing. In a multi-stage centrifugal fluid machine, a partition plate formed into a plate shape from a thin plate is bent from the outer peripheral edge toward the side plate of the next stage to form a plurality of guide vanes, and the guide vanes are arranged from the starting end to the ending end in the impeller rotation direction. A diffuser whose cross section gradually increases is formed between the guide vane and the casing cylindrical part by gradually decreasing the radius of A diffuser for a multi-stage centrifugal fluid machine, characterized in that the diffuser and the return flow path communicate with each other at a terminal end of the diffuser. 2) In the diffuser for a multi-stage centrifugal fluid machine according to claim 1, the outer peripheral end of the partition plate is circular;
A diffuser for a multi-stage centrifugal fluid machine, characterized in that the radius of the bent end of the guide vane toward the next stage side plate gradually decreases.
JP15642788A 1988-06-24 1988-06-24 Diffuser of multiple stage centrifugal hydraulic machine Pending JPH025798A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15642788A JPH025798A (en) 1988-06-24 1988-06-24 Diffuser of multiple stage centrifugal hydraulic machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15642788A JPH025798A (en) 1988-06-24 1988-06-24 Diffuser of multiple stage centrifugal hydraulic machine

Publications (1)

Publication Number Publication Date
JPH025798A true JPH025798A (en) 1990-01-10

Family

ID=15627511

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15642788A Pending JPH025798A (en) 1988-06-24 1988-06-24 Diffuser of multiple stage centrifugal hydraulic machine

Country Status (1)

Country Link
JP (1) JPH025798A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0646729A1 (en) * 1993-09-06 1995-04-05 KSB Aktiengesellschaft Diffusor made of sheet metal
WO2002097278A1 (en) * 2001-05-31 2002-12-05 Ksb Aktiengesellschaft Stage housing constructed from multiple metal sheets
US7632065B2 (en) 2004-04-26 2009-12-15 Ebara Corporation Centrifugal pump and method of manufacturing the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0646729A1 (en) * 1993-09-06 1995-04-05 KSB Aktiengesellschaft Diffusor made of sheet metal
WO2002097278A1 (en) * 2001-05-31 2002-12-05 Ksb Aktiengesellschaft Stage housing constructed from multiple metal sheets
US7632065B2 (en) 2004-04-26 2009-12-15 Ebara Corporation Centrifugal pump and method of manufacturing the same

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