JP2000186694A - Non-prewhirl suction casing for pump - Google Patents

Non-prewhirl suction casing for pump

Info

Publication number
JP2000186694A
JP2000186694A JP10363336A JP36333698A JP2000186694A JP 2000186694 A JP2000186694 A JP 2000186694A JP 10363336 A JP10363336 A JP 10363336A JP 36333698 A JP36333698 A JP 36333698A JP 2000186694 A JP2000186694 A JP 2000186694A
Authority
JP
Japan
Prior art keywords
suction casing
base circle
straight line
suction
radius
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
JP10363336A
Other languages
Japanese (ja)
Inventor
Takuji Tsugawa
卓司 津川
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP10363336A priority Critical patent/JP2000186694A/en
Publication of JP2000186694A publication Critical patent/JP2000186694A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/42Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44Fluid-guiding means, e.g. diffusers
    • F04D29/445Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00Geometry
    • F05D2250/50Inlet or outlet
    • F05D2250/51Inlet

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

PROBLEM TO BE SOLVED: To equalize inflow angles of water in respect to an outer peripheral inlet of a pump impeller all over circumference during one rotation of the pump impeller concentrically corresponding to a base circle, and improve pumping efficiency by equalizing radial speed on a base circle in an anti-inflow area to radial speed in an inflow area. SOLUTION: Oppositely to an inflow area 2 on an upstream side of a first straight line X-X passing a suction casing 5 and a suction casing base circle 1, a suction passage 3 is formed so as to be directed to a second straight line Y-Y passing a center O and perpendicular to the first straight line X-X. A radius r0 of the suction casing 5 above the first line X-X is substantially half as a water passage width W between both side standing walls 3A, 3A of a suction passage 3. A radius r0 continued from the standing walls 3A, 3A to standing walls 5A, 5A in an anti-inflow area 4 of the suction casing 5 is set decreasingly from a maximum value equivalent to a radius r01 above the first line X-X to a minimum value equivalent to a radius ri of the suction casing base circle 1 crossing with the second straight line Y-Y.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、ポンプの非予旋回
型吸込ケーシングに関する。
The present invention relates to a non-pre-rotating suction casing for a pump.

【0002】[0002]

【従来の技術】図3に示すように、吸込ケーシング基礎
円1の円周方向外周域で予旋回流Sを発生させるため、
吸込ケーシング5の接線に沿う吸水路3を設けた予旋回
型吸込ケーシングが知られている。この種の予旋回型吸
込ケーシングでは、予旋回流Sによって、吸込ケーシン
グ基礎円1上の任意の各点における半径方向速度Cr
略一様に改善される。つまり、吸込ケーシング基礎円1
上の半径方向速度Cr が全周で略均一になるので、吸込
ケーシング基礎円1に同心で対応するポンプ羽根車(図
示省略)が1回転する間の羽根車外周入口部に対する水
の流入角を吸込ケーシング基礎円1の全周で均一にし
て、ポンプ効率を改善させることができる。
2. Description of the Related Art As shown in FIG. 3, in order to generate a pre-swirling flow S in a circumferential outer peripheral area of a suction casing base circle 1,
A pre-swirl type suction casing provided with a water suction passage 3 along a tangent to the suction casing 5 is known. In this type of pre-rotation-type suction casing, by pre-swirl circumfluence S, radial velocity C r at any points on the suction casing base circle 1 is substantially uniformly improved. That is, suction casing base circle 1
Since radial velocity C r above is substantially uniform all around, the inflow angle of water to the impeller outer peripheral inlet portion between the pump impeller (not shown) rotates one corresponding concentrically suction casing base circle 1 Can be made uniform over the entire circumference of the suction casing base circle 1 to improve the pump efficiency.

【0003】しかし、予旋回型吸込ケーシングは、吸込
ケーシング5の横に大きくはみ出る吸水路3を設けた構
造になっているので、構築作業が煩雑であるとともに、
構築場所によってはスペース上の制約により、構築が制
限されるおそれを有している。
However, since the pre-swirl type suction casing has a structure in which the water suction passage 3 which protrudes largely beside the suction casing 5, the construction work is complicated, and
Depending on the construction location, construction may be restricted due to space restrictions.

【0004】一方、図4に示すように、吸込ケーシング
5と同心で半径ri の吸込ケーシング基礎円1の中心O
を通る第1直線X−Xに直交して前記中心Oを通る第2
直線Y−Yの方向に指向し、かつ吸込ケーシング5およ
び吸込ケーシング基礎円1における第1直線X−Xより
上流側の流入領域2(右上がりの破線で示す)に対向し
て吸水路3が設けられ、吸込ケーシング5の第1直線X
−X上の半径r0 1 を吸水路3の両側立壁3A,3A間
の水路幅Wの1/2に略相当する値に設定するととも
に、両側立壁3A,3Aに連続して吸込ケーシング5の
反流入領域4(右下がりの破線で示す)に設けられる立
壁5Aの曲率半径r0 を前記半径r0 1 と同じ値に設定
した非予旋回型吸込ケーシングがある。
On the other hand, as shown in FIG. 4, the center O of the suction casing base circle first radius r i in the suction casing 5 concentrically
A second line passing through the center O at right angles to a first straight line XX passing through
The water suction passage 3 is directed in the direction of the straight line YY, and faces the inflow area 2 (shown by a broken line rising to the right) upstream of the first straight line XX in the suction casing 5 and the suction casing base circle 1. The first straight line X of the suction casing 5 is provided.
Both side standing wall 3A of radius r 0 1 a water passage 3 on the -X, and sets a substantially equivalent value to half of the channel width W between 3A, both side standing wall 3A, the suction casing 5 in succession 3A There is a non-pre-rotation type suction casing in which the radius of curvature r 0 of the upright wall 5A provided in the anti-inflow region 4 (shown by a broken line falling to the right) is set to the same value as the radius r 0 1.

【0005】この種の非予旋回型吸込ケーシングは、図
3の予旋回型吸込ケーシングのように、吸水路3が吸込
ケーシング5の横に大きくはみ出ないので、構築作業が
容易になるとともに、スペース上の制約を緩和して、構
築制限を避けることができる。ところが、吸水路3が上
流側の流入領域2に対向して設けられているので、流入
領域2における吸込ケーシング基礎円1上(P1点〜P
3点の間とP1点〜P4点の間)では、一様な半径方向
速度Cr が得られるものの、反流入領域4における吸込
ケーシング基礎円1上(P3点〜P2点の間とP4点〜
P2点の間)の半径方向速度Cr は、P3点から〜P2
点にかけて漸次小さくなり、またP4点からP2点にか
けて漸次小さくなる。つまり、吸込ケーシング基礎円1
上の半径方向速度Cr が反流入領域4で不均一になる。
このため、吸込ケーシング基礎円1に同心で対応するポ
ンプ羽根車(図示省略)が1回転する間の羽根車外周入
口部に対する水の流入量は反流入領域4の吸込ケーシン
グ基礎円1上で不均一になってポンプ効率を低下させて
いる。
In this type of non-pre-rotation type suction casing, unlike the pre-rotation type suction casing shown in FIG. 3, the water suction passage 3 does not protrude greatly beside the suction casing 5, so that the construction work becomes easy and the space is reduced. The above restrictions can be relaxed to avoid construction restrictions. However, since the water suction passage 3 is provided so as to face the inflow region 2 on the upstream side, the suction passage 3 is formed on the suction casing base circle 1 in the inflow region 2 (points P1 to P1).
In between between 3 points and a point P1 ~P4 points), uniform although radial velocity C r is obtained, during the suction casing base circle 1 above (P3 points ~P2 points at the anti-inflow region 4 and point P4 ~
Radial velocity C r between the point P2) are, to P2 from P3 point
It gradually decreases toward the point, and gradually decreases from the point P4 to the point P2. That is, suction casing base circle 1
The upper radial speed Cr becomes uneven in the anti-inflow region 4.
For this reason, the amount of water flowing into the outer periphery inlet of the impeller during one rotation of the pump impeller (not shown) concentrically corresponding to the suction casing base circle 1 is not sufficient on the suction casing base circle 1 in the anti-inflow region 4. It becomes uniform and reduces the pump efficiency.

【0006】[0006]

【発明が解決しようとする課題】従来の非予旋回型吸込
ケーシングでは、流入領域における吸込ケーシング基礎
円上では、一様な半径方向速度が得られるものの、反流
入領域における吸込ケーシング基礎円上では半径方向速
度が不均一になる。これにより、ポンプ羽根車が1回転
する間の羽根車外周入口部に対する水の流入量は吸込ケ
ーシング基礎円上で不均一になってポンプ効率を低下さ
せている。
In the conventional non-pre-swirling type suction casing, a uniform radial velocity is obtained on the suction casing base circle in the inflow region, but it is not uniform on the suction casing base circle in the counter-inflow region. Non-uniform radial velocity. As a result, the amount of water flowing into the outer periphery inlet of the impeller during one rotation of the pump impeller becomes uneven on the suction casing base circle, thereby reducing the pump efficiency.

【0007】そこで、本発明は、流入領域における吸込
ケーシング基礎円上では、一様な半径方向速度が得られ
ることは勿論、反流入領域における吸込ケーシング基礎
円上でも流入領域の半径方向速度と等しい半径方向速度
を得ることによって、吸込ケーシング基礎円に同心で対
応するポンプ羽根車が1回転する間の羽根車外周入口部
に対する水の流入量を吸込ケーシング基礎円の全周で均
一にすることで、ポンプ効率を改善させることができる
非予旋回型吸込ケーシングを提供することを目的として
いる。
Therefore, the present invention provides not only a uniform radial velocity on the suction casing base circle in the inflow area but also a radial velocity in the inflow area on the suction casing base circle in the counter-inflow area. By obtaining the radial velocity, the inflow of water into the outer periphery inlet of the impeller during one rotation of the pump impeller concentrically corresponding to the suction casing base circle is made uniform over the entire circumference of the suction casing base circle. It is another object of the present invention to provide a non-pre-swirl type suction casing capable of improving pump efficiency.

【0008】[0008]

【課題を解決するための手段】前記目的を達成するため
に、本発明に係る非予旋回型吸込ケーシングは、吸込ケ
ーシング5と同心で半径ri の吸込ケーシング基礎円1
の中心Oを通る第1直線X−Xに直交して前記中心Oを
通る第2直線Y−Yの方向に指向し、かつ吸込ケーシン
グ5および吸込ケーシング基礎円1における第1直線X
−Xより上流側の流入領域2に対向して吸水路3が設け
られ、第1直線X−X上の吸込ケーシング5の半径r0
を吸水路3の両側立壁3A,3A間の水路幅Wの1/2
に略相当する値に設定するとともに、前記両側立壁3
A,3Aに連続して吸込ケーシング5の反流入領域4に
立壁5A,5Aを設けた非予旋回型吸込ケーシングにお
いて、前記反流入領域4における吸込ケーシング基礎円
1上の半径方向速度Cr が前記流入領域2における基礎
円1上の半径方向速度Cr と等しい値になるように、吸
込ケーシング基礎円1の中心Oから前記立壁5A,5A
までの半径r0 を前記第1直線X−X上の半径r0 に相
当する最大値から第2直線Y−Y上で吸込ケーシング基
礎円1に交わる吸込ケーシング基礎円1の半径ri に相
当する最小値にかけて小さく設定していることを特徴と
している。
To SUMMARY OF THE INVENTION To achieve the above object, the non pre-rotation-type suction casing according to the present invention, suction casing base circle 1 of radius r i in the suction casing 5 concentrically
The first straight line X is orthogonal to the first straight line X-X passing through the center O and is directed in the direction of the second straight line Y-Y passing through the center O, and the first straight line X in the suction casing 5 and the suction casing base circle 1.
A water suction passage 3 is provided to face the inflow area 2 upstream of −X, and a radius r 0 of the suction casing 5 on the first straight line XX.
Is の of the width W of the water channel between the two standing walls 3A, 3A of the water suction channel 3.
And a value substantially corresponding to
A, anti-draining 4 to vertical wall 5A of the suction casing 5 in succession 3A, in the non-pre-rotation-type suction casing provided with 5A, radial velocity C r on suction casing base circle 1 in the anti-draining 4 said inlet so as to equal to the radial velocity C r on the base circle 1 in the region 2, the standing wall 5A from the center O of the suction casing base circle 1, 5A
Equivalent radius r 0 in radius r i of the suction casing base circle 1 intersecting the suction casing base circle 1 from the maximum value on the second straight line Y-Y corresponding to the radius r 0 on the first straight line X-X up to It is characterized in that it is set to be smaller toward the minimum value.

【0009】本発明によれば、反流入領域4における吸
込ケーシング基礎円1上の半径方向速度Cr が流入領域
2における基礎円1上の半径方向速度Cr と等しい値に
なる。その結果、吸込ケーシング基礎円1に同心で対応
するポンプ羽根車が1回転する間の羽根車外周入口部に
対する水の流入量を吸込ケーシング基礎円1の全周で均
一にすることができる。
According to the present invention, radial velocity C r on suction casing base circle 1 at the anti-draining 4 becomes equal to the radial velocity C r on the base circle 1 in the inflow region 2. As a result, the amount of water flowing into the outer periphery inlet of the impeller can be made uniform over the entire circumference of the suction casing base circle 1 during one rotation of the pump impeller corresponding to the suction casing base circle 1.

【0010】[0010]

【発明の実施の形態】以下、本発明の一実施の形態を図
面に基づいて説明する。図1は本発明に係る非予旋回型
吸込ケーシングの一実施の形態を示す平面図、図2は図
1の第2直線Y−Yに沿う縦断面図である。なお、図3
および図4で説明した従来例と同一もしくは相当部分に
は同一符号を付して説明する。
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a non-pre-rotation type suction casing according to the present invention, and FIG. 2 is a longitudinal sectional view along a second straight line YY in FIG. Note that FIG.
The same or corresponding parts as those in the conventional example described with reference to FIG.

【0011】図1において、吸込ケーシング5と同心で
半径ri の吸込ケーシング基礎円1の中心Oを通る第1
直線X−Xに直交して前記中心Oを通る第2直線Y−Y
の方向に指向し、かつ吸込ケーシング5および吸込ケー
シング基礎円1における第1直線X−Xより上流側の流
入領域2に対向して吸水路3が設けられ、吸込ケーシン
グ5の第1直線X−X上の半径r0 を吸水路3の両側立
壁3A,3A間の水路幅Wの1/2に略相当する値に設
定するとともに、両側立壁3A,3Aに連続して吸込ケ
ーシング5の反流入領域4に立壁5A,5Aが設けられ
ている。
[0011] In FIG. 1, first passing through the center O of the suction casing base circle 1 of radius r i in the suction casing 5 concentrically
A second straight line YY passing through the center O perpendicular to the straight line XX
And a suction passage 3 is provided facing the inflow area 2 upstream of the first straight line XX of the suction casing 5 and the suction casing base circle 1 in the suction casing 5 and the first straight line X- The radius r 0 on X is set to a value substantially corresponding to の of the width W of the water passage between the two standing walls 3A, 3A of the water suction passage 3, and the counterflow of the suction casing 5 continuously to the both standing walls 3A, 3A. In the area 4, standing walls 5A, 5A are provided.

【0012】吸水路3の両側立壁3A,3A間の水路幅
W=13m、 第1直線X−X上の吸込ケーシング5の半径r0 =前記
Wの約1/2=6.5m、 吸水路3の高さH=3.2m、 基礎円1の半径ri =3.25m、 流量Q=100m/S、 吸水路3から吸込ケーシング5に向かう水の流速C=
2.4m/S、 流入領域2における基礎円1上の半径方向速度Cr
1.53m/Sに設定した非予旋回型吸込ケーシングに
おいて、
The width W of the water passage between the two vertical walls 3A, 3A of the water suction passage 3 is 13 m, the radius r 0 of the suction casing 5 on the first straight line XX is about 1/2 of the above W = 6.5 m, 3, the height H = 3.2 m, the radius r i of the base circle 1 = 3.25 m, the flow rate Q = 100 m 3 / S, the flow velocity C of water flowing from the water suction passage 3 to the suction casing 5 =
2.4 m / S, the radial velocity of the base circle 1 in the inflow region 2 C r =
In the non-pre-swirl type suction casing set at 1.53 m / S,

【0013】吸込ケーシング基礎円1の流入領域2にお
けるP1点を通る第2直線Y−Yから吸込ケーシング基
礎円1におけるP3点およびP4点を通る第1直線X−
Xまでの角度θ(rad)=90゜。 第2直線Y−Yから吸込ケーシング基礎円1におけるP
5点、P6点および中止Oを通る直線XY1までの角度
θ1(rad)=105゜。 第2直線Y−Yから吸込ケーシング基礎円1におけるP
7点、P8点および中止Oを通る直線XY2までの角度
θ2(rad)=120゜。 第2直線Y−Yから吸込ケーシング基礎円1におけるP
9点、P10点および中止Oを通る直線XY3までの角
度θ3(rad)=135゜。 第2直線Y−Yから吸込ケーシング基礎円1におけるP
11点、P12点および中止Oを通る直線XY4までの
角度θ4(rad)=150゜。 第2直線Y−Yから吸込ケーシング基礎円1におけるP
13点、P14点および中止Oを通る直線XY5までの
角度θ5(rad)=165゜。 当然、吸込ケーシング基礎円1の流入領域2P1点から
反流入側P2点までの角度θ6(rad)=180゜と
した場合、(P3点、P4点)と(P5点、P6点)〜
(P13点、P14点)およびP2点での半径方向速度
r を第1直線X−Xより上流側の流入領域2における
基礎円1上の半径方向速度Cr と等しい1.53m/S
に設定するための中心Oから立壁5Aまでの半径r0
値、すなわち、中心Oから第1直線X−X上のP3´、
P4´までの半径r0 の値と、中心Oから直線XY1〜
直線XY5上のP5´〜P13´までの半径r0 の値お
よびおよび第2直線Y−Y上で吸込ケーシング基礎円1
に交わり、吸込ケーシング基礎円1の半径ri に相当す
る半径r0 の値は、数式に基づく数式よって下記
(表1)に示す大きさに算出され、反流入領域4におけ
る吸込ケーシング基礎円1上の半径方向速度Cr を流入
領域2における基礎円1上の半径方向速度Crと等しい
1.53m/Sに設定することができる。
A second straight line Y-Y passing through the point P1 in the inflow area 2 of the suction casing base circle 1 to a first straight line X- passing through the points P3 and P4 in the suction casing base circle 1.
Angle θ (rad) to X = 90 °. From the second straight line Y-Y, P in the suction casing base circle 1
Angle θ1 (rad) = 105 ° to the straight line XY1 passing through the five points, the P6 point and the stop O. From the second straight line Y-Y, P in the suction casing base circle 1
Angle θ2 (rad) = 120 ° to line XY2 passing through point 7, point P8 and stop O. From the second straight line Y-Y, P in the suction casing base circle 1
An angle θ3 (rad) = 135 ° to the straight line XY3 passing through the nine points, the P10 point, and the stop O. From the second straight line Y-Y, P in the suction casing base circle 1
Angle θ4 (rad) = 150 ° from the eleventh point, the P12 point and the straight line XY4 passing through the stop O. From the second straight line Y-Y, P in the suction casing base circle 1
Angle θ5 (rad) = 165 ° to the straight line XY5 passing through the 13 points, the P14 points and the stop O. Naturally, when the angle θ6 (rad) from the inflow area 2P1 point of the suction casing base circle 1 to the opposite inflow side P2 point is 180 °, (P3 point, P4 point) and (P5 point, P6 point) ~
(P13 points, P14 points) and radial velocity C radial velocity of r the on the base circle 1 from the first straight line X-X in draining 2 upstream C r equal 1.53 M / S at point P2
, The value of the radius r 0 from the center O to the vertical wall 5A, that is, P3 ′ on the first straight line XX from the center O,
The value of the radius r 0 up to P4 ′ and the straight lines XY1 to XY1 from the center O
The value of the radius r 0 from P5 ′ to P13 ′ on the straight line XY5 and the suction casing base circle 1 on the second straight line YY
The intersection, the value of the radius r 0 corresponding to the radius r i of the suction casing base circle 1 is calculated to indicate magnitude below I by formula based on the equation (Table 1), suction casing base circle 1 at the anti-draining 4 it is possible to set the radial velocity C r of the upper and equal 1.53 M / S radial velocity C r on the base circle 1 in the inflow region 2.

【0014】[0014]

【数式1】 [Formula 1]

【0015】[0015]

【数式2】 [Formula 2]

【0016】[0016]

【表1】 [Table 1]

【0017】前記表1で明らかなように、反流入領域4
における吸込ケーシング基礎円1上の半径方向速度Cr
が流入領域2における基礎円1上の半径方向速度Cr
等しい値になる。その結果、吸込ケーシング基礎円1に
同心で対応するポンプ羽根車が1回転する間の羽根車外
周入口部に対する水の流入量を吸込ケーシング基礎円1
の全周で均一にして、ポンプ効率を改善させることがで
きる。
As apparent from Table 1, the anti-inflow area 4
Radial velocity C r on suction casing base circle 1 at
There will equal radial velocity C r on the base circle 1 in the inflow region 2 values. As a result, while the pump impeller corresponding to the suction casing base circle 1 makes one rotation, the amount of water flowing into the outer peripheral inlet of the impeller is determined by the suction casing base circle 1.
Can be made uniform over the entire circumference to improve the pump efficiency.

【0018】なお、前記数式は、数式→数式→数
式→数式→数式→数式の順序に基づいて算出す
ることができる。
The above equation can be calculated based on the order of equation → expression → expression → expression → expression → expression.

【0019】[0019]

【数式3】 [Equation 3]

【0020】[0020]

【数式4】 (Equation 4)

【0021】[0021]

【数式5】 (Equation 5)

【0022】[0022]

【数式6】 (Equation 6)

【0023】[0023]

【数式7】 [Formula 7]

【0024】[0024]

【数式8】 (Equation 8)

【0025】[0025]

【発明の効果】以上説明したように、本発明は、吸込ケ
ーシング基礎円1の中心Oから前記立壁5A,5Aまで
の半径r0 を前記第1直線X−X上の半径r0 に相当す
る最大値から第2直線Y−Y上で吸込ケーシング基礎円
1に交わる吸込ケーシング基礎円1の半径ri に相当す
る最小値にかけて小さく設定することにより、反流入領
域4における吸込ケーシング基礎円1上の半径方向速度
r を流入領域2における基礎円1上の半径方向速度C
r と等しい値にできるから、吸込ケーシング基礎円1に
同心で対応するポンプ羽根車の外周入口部に対する水の
流入量を吸込ケーシング基礎円1の全周で均一にして、
ポンプ効率を改善させることができる。
As described in the foregoing, the present invention corresponds the standing wall 5A from the center O of the suction casing base circle 1, the radius r 0 to 5A to the radius r 0 on the first straight line X-X by smaller from the maximum value toward the minimum value corresponding to a second straight Y-Y on the radius r i of the suction casing base circle 1 intersecting the suction casing base circle 1, suction casing base circle 1 on the anti-draining 4 Radial velocity C r on the base circle 1 in the inflow region 2
Since the value can be made equal to r , the amount of water flowing into the outer peripheral inlet of the pump impeller corresponding to the suction casing base circle 1 concentrically is made uniform over the entire circumference of the suction casing base circle 1,
Pump efficiency can be improved.

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

【図1】本発明に係る非予旋回型吸込ケーシングの一実
施の形態を示す平面図である。
FIG. 1 is a plan view showing an embodiment of a non-pre-rotation type suction casing according to the present invention.

【図2】図1の第2直線Y−Yに沿う縦断面図である。FIG. 2 is a longitudinal sectional view taken along a second straight line YY of FIG.

【図3】第1従来例の平面図である。FIG. 3 is a plan view of a first conventional example.

【図4】第2従来例の平面図である。FIG. 4 is a plan view of a second conventional example.

【符号の説明】[Explanation of symbols]

1 吸込ケーシング基礎円 2 流入領域 3 吸水路 3A 吸水路の立壁 4 反流入領域 5 吸込ケーシングの反流入領域に設けた立壁 O L 羽根1Aの入口外側への延長線 O 吸込ケーシング基礎円の中心 W 吸水路の幅 X−X 第1直線 Y−Y 第2直線 ri 吸込ケーシング基礎円の半径 r0 吸込ケーシング基礎円の中心から立壁までの半径 Cr 基礎円上の半径方向速度DESCRIPTION OF SYMBOLS 1 Suction casing base circle 2 Inflow area 3 Water absorption path 3A Standing wall of water absorption path 4 Anti-inflow area 5 Standing wall provided in counter-inflow area of suction casing OL L Extension line to outside of inlet of blade 1A O Center of suction casing base circle W XX 1st straight line YY 2nd straight line r i Radius of suction casing base circle r 0 Radius from center of suction casing base circle to standing wall C r Radial velocity on base circle

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 吸込ケーシング5と同心で半径ri の吸
込ケーシング基礎円1の中心Oを通る第1直線X−Xに
直交して前記中心Oを通る第2直線Y−Yの方向に指向
し、かつ吸込ケーシング5および吸込ケーシング基礎円
1における第1直線X−Xより上流側の流入領域2に対
向して吸水路3が設けられ、第1直線X−X上の吸込ケ
ーシング5の半径r0 を吸水路3の両側立壁3A,3A
間の水路幅Wの1/2に略相当する値に設定するととも
に、前記両側立壁3A,3Aに連続して吸込ケーシング
5の反流入領域4に立壁5A,5Aを設けた非予旋回型
吸込ケーシングにおいて、前記反流入領域4における吸
込ケーシング基礎円1上の半径方向速度Cr が前記流入
領域2における基礎円1上の半径方向速度Cr と等しい
値になるように、吸込ケーシング基礎円1の中心Oから
前記立壁5A,5Aまでの半径r0 を前記第1直線X−
X上の半径r0 に相当する最大値から第2直線Y−Y上
で吸込ケーシング基礎円1に交わる吸込ケーシング基礎
円1の半径ri に相当する最小値にかけて小さく設定し
ていることを特徴とするポンプの非予旋回型吸込ケーシ
ング。
1. Direction in the direction of a second straight line YY passing through the center O orthogonal to a first straight line XX passing through the center O of a suction casing base circle 1 having a radius r i and concentric with the suction casing 5. In addition, a suction passage 3 is provided opposite to the inflow area 2 on the upstream side of the first straight line XX in the suction casing 5 and the suction casing base circle 1, and the radius of the suction casing 5 on the first straight line XX r 0 is the vertical wall 3A, 3A on both sides of the water suction passage 3
And a non-pre-swirl type suction in which the upright walls 5A, 5A are provided in the anti-inflow area 4 of the suction casing 5 continuously with the upright walls 3A, 3A. in the casing, the so radial velocity C r on suction casing base circle 1 at the anti-draining 4 becomes equal to the radial velocity C r on the base circle 1 in the inlet region 2, suction casing base circle 1 The radius r 0 from the center O to the vertical walls 5A, 5A is defined by the first straight line X−
Characterized in that the set smaller from the maximum value toward the minimum value corresponding to a second straight Y-Y on the radius r i of the suction casing base circle 1 intersecting the suction casing base circle 1 corresponding to the radius r 0 of the X Non-pre-swirl type suction casing of pump.
JP10363336A 1998-12-21 1998-12-21 Non-prewhirl suction casing for pump Pending JP2000186694A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10363336A JP2000186694A (en) 1998-12-21 1998-12-21 Non-prewhirl suction casing for pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10363336A JP2000186694A (en) 1998-12-21 1998-12-21 Non-prewhirl suction casing for pump

Publications (1)

Publication Number Publication Date
JP2000186694A true JP2000186694A (en) 2000-07-04

Family

ID=18479077

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10363336A Pending JP2000186694A (en) 1998-12-21 1998-12-21 Non-prewhirl suction casing for pump

Country Status (1)

Country Link
JP (1) JP2000186694A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105545798A (en) * 2015-12-10 2016-05-04 武汉船用机械有限责任公司 Design method of water-jet propulsion pump impeller
EP2402618A4 (en) * 2009-02-27 2018-01-31 Mitsubishi Heavy Industries, Ltd. Suction casing and fluid machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2402618A4 (en) * 2009-02-27 2018-01-31 Mitsubishi Heavy Industries, Ltd. Suction casing and fluid machine
CN105545798A (en) * 2015-12-10 2016-05-04 武汉船用机械有限责任公司 Design method of water-jet propulsion pump impeller

Similar Documents

Publication Publication Date Title
CN102803740B (en) Centrifugal compressor system
US5857834A (en) Centrifugal fluid machine
US8454317B2 (en) Radial or diagonal fan wheel
WO2010150567A1 (en) Turbine rotor
JP6470578B2 (en) Centrifugal compressor
JPS5949437B2 (en) mixed flow blower impeller
JPH0341643B2 (en)
CN206322105U (en) Centrifugal fan
JP2000186694A (en) Non-prewhirl suction casing for pump
JP2001263296A (en) Turbo machine
JP3959012B2 (en) Friction regenerative fuel pump
JPS61268894A (en) Vane type compressor
JP2003056485A (en) Vortex flow fan
JPH10311294A (en) Centrifugal blower
JP3530664B2 (en) Internal gear type fluid device
JP6583558B2 (en) Centrifugal blower
JP3912331B2 (en) Centrifugal fluid machine
JPS6344960B2 (en)
CN108999980A (en) Shaft seal device
US2470987A (en) Rotary pump stator
KR100280009B1 (en) Low Noise High Airflow Sirocco Fan
JPH01167500A (en) Air blower
JPS6030479Y2 (en) vertical shaft pump
JP3160486B2 (en) Centrifugal compressor
RU2196251C1 (en) Double-rotor compressor