CN1131453A - Device for preventing turbulence at pump inlets - Google Patents

Device for preventing turbulence at pump inlets Download PDF

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Publication number
CN1131453A
CN1131453A CN94193425A CN94193425A CN1131453A CN 1131453 A CN1131453 A CN 1131453A CN 94193425 A CN94193425 A CN 94193425A CN 94193425 A CN94193425 A CN 94193425A CN 1131453 A CN1131453 A CN 1131453A
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China
Prior art keywords
convex ridge
water
inlet cavity
pump
described device
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Granted
Application number
CN94193425A
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Chinese (zh)
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CN1051359C (en
Inventor
S·布罗德森
G·费弗-米勒
R·科普
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KSB AG
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KSB AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/688—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Abstract

The subject matter of the invention is a low-complexity device for preventing turbulence arising at the base (6) and rear wall (3) of the inlet chamber (1) of a centrifugal pump. The device has a ridge (7) of any cross section running along the base (6) of the inlet chamber (1) and passing through the extended central axis of the pump inlet (4). The height (h) and width (b) of the cross section and of the segments (x1 and x2) thereof on either side of the extended central axis (9) of the pump inlet (4) are defined by reference to the diameter (D) of the pump inlet (4) as follows: a) 0,055 < h/D < 0,29; b) 0,045 < b/D < 0,39; c) 0,45 < x1/D < INFINITY ; d) 0,45 < x2/D < INFINITY .

Description

Prevent the device of the vortex under water of pump inlet place
In many patent application cases, centrifugal pump will be pumped to fluid in the intake pipe of a vertical dosage (see KSB-Kreisel-pumpenlexikon, 1989,88-89 page or leaf) from the water-inlet cavity suction of the tank that also is called pump.More particularly, such water-inlet cavity is the water inlet condition that is used to improve centrifugal pump, and the purpose that adopts it is the current that will produce one uniform vortex-free supply pump of trying one's best.Under the situation of the pump of the flank speed that adopts propulsion device or semiaxis streaming impeller, this is a particular importance, because they directly produce reaction to the uneven degree in the stream that supplies water.
This tubing pump intake pipe front end is equipped with a fill hose joint usually, and it also claims the suction cover.Because this kind fill hose joint, the nonuniformity on the velocity distribution of influent has been eliminated.
In addition, often adopt the various measures of control or prevention vortex, they are used to prevent to suck air, and restriction current direction pump water inlet tube side is to rotating (referring to DVWK-Schriften: " Wirbelbildung an Einlaufbauwerken-Luft-und Dralleintrag " 1983,48 to 49 pages, author Tost knaus professor).What will consider in this respect is, the pattern of vortex, and the reason of generation is different with the place.Therefore, need prevent vortex in a different manner.In the documents of being quoted, prevent that the most important method of vortex from it is said minimizing circulation.
Recommended to be disposed at the wrong structure of next door, taper or cross of pump water inlet pipe bottom, as the device that is intended to reduce rotation.
In in order to the pump that prevents to have a vertical shaft, form in the known devices of vortex (seeing Japanese Patent Publication 61155699A), recommend a L shaped next door, it starts from along the following part of extending of pump water inlet pipe, disappear to the part that is configured on the water-inlet cavity rear wall, far extend the roof that is reduced to the water-inlet cavity in the horizontal plane.For fear of the surperficial vortex of suction air, also be provided with the anti-vortex plate washer that is fixed in roof bottom.
Dividing plate, thin guide metal and plate or anti-vortex plate washer and rod member all can not prevent certain vortex, and it originates from the wall of surface, bottom surface and qualification water-inlet cavity, are known as substantially or vortex under water.One end of this vortex is subjected to the constraint of bottom surface or corresponding wall, and is moving toward backward shift in a certain interval, and the other end extends in the pump.Because the rotational speed of vortex core is high under water, here static pressure will be lower than the vapor pressure of this liquid, and vortex will present the form of steam pressure inlet as a result.Yet because this structure is extremely unstable, and because the increase of static pressure, it can cause a kind of unexpected disappearance that crushes shape, and as the steam bubble that produces the hole, and the vortex under water that far extends the centrifugal pump impeller will cause vibration and mechanical failure.
For fear of vortex under water, mainly adopt the intake pipe cone so far.Above-mentioned documents " KSB-KreiselpumpenlexiKon " and " DVWK-Schriften " disclose this intake pipe cone, and it is forever to be installed in intake pipe to chew flow guide device on the water-inlet cavity bottom surface of upstream.
Preventing that another known means of vortex is near on the water-inlet cavity surface in pump water inlet chamber under water, be provided with the surface of a metallic coating or a special shape, by it, so far is that level and smooth surface is interrupted continually.
This inhibition measure of vortex under water is very successful, but their more complicated.
The objective of the invention is and to prevent that the measure of vortex is minimized under water.This realizes by such device, it comprise one be disposed on the water-inlet cavity bottom surface and along the convex ridge with any desirable cross section of the extension of central axis of pump water inlet pipe, the scope (X1 and X2) that the extension center line of the height of convex ridge and width and self-pumping intake pipe stretches has following numerical value with respect to pump water inlet pipe diameter (D):
0.55＜h/D＜0.29
0.045＜b/D＜0.39
0.45＜X1/D＜∞
0.45 the diameter that＜X2/D＜∞ provides as relative value (D) is not to be the diameter of fill hose joint, so is the diameter that is disposed at the tubing pump intake pipe of fill hose joint top.
The present invention is based on following discovery: vortex produces under with the same condition of the tornado in the earth atmosphere usually under water.On the ground, what exist the shearing of the fluid that flows with friction speed that produces at random in the adjacent area.Because this potential may develop, it makes this fluid parallel steer ground.If in the vicinity of this phenomenon, a point that plays hole in the aerodynamics general knowledge is arranged, fluid enters this point and just flows or corresponding acceleration, and then original fine rotation just forms one tornado at this moment.Under the situation in pump water inlet chamber, this hole is the water inlet pressure inlet of pump water inlet pipe.Therefore, for preventing to produce vortex, on the bottom surface and the mobile palpus on the respective wall so far destroyed, the part is rotatablely moved can not be set up.This must only occur over just in the near zone of aerodynamics hole again.Therefore, not the whole surface of bottom surface or wall, and only be to cause the zone of vortex under water that be provided with a convex ridge, its size provides in the above.
Define another structure of the convex ridge that is configured on water-inlet cavity and the wall in another embodiment of the present invention, its height and width are in the lit range that is applicable to the bottom surface upper ridge.In another embodiment, bottom surface convex ridge and wall convex ridge are capable of being combined becomes single L shaped convex ridge.
In most patent application, the optimal structure that is configured in the convex ridge on the water-inlet cavity bottom surface is, defined in an embodiment again, along main flow direction extend a kind of.Yet this convex ridge also can be as defined in another embodiment, and its bearing of trend and main flow are at angle.In addition, this convex ridge need not constitute a straight line completely, and by what another embodiment limited, its structure can be different from linear structure.Especially, this can be to limit by an embodiment again, and this convex ridge comprises two each other with the legs of angle configuration, or by what another embodiment limited, it extends along a curve shape.The cross section of this convex ridge defined in an embodiment again can change along its expanded range.
Referring now to each embodiment, be described in detail the present invention.
Fig. 1 to 3 represents a water-inlet cavity that is provided with water feed apparatus of the present invention with 3 views;
Fig. 4 represents to be located at the bottom surface of water-inlet cavity or the various possible cross-sectional form of the convex ridge on the rear wall;
The planimetric map of Fig. 5 and 5 expression water-inlet cavitys, the bottom surface is provided with convex ridge, and they do not extend along main flow direction;
Fig. 7 represents another structure of apparatus of the present invention, is provided with convex ridge on the bottom surface of water-inlet cavity and wall.
The water-inlet cavity of describing in Fig. 1 to 31 is correspondingly to constitute between a two side 2 and a rear wall 3.The suction sleeve of the arranged perpendicular of pump water inlet pipe 4 extends in the water-inlet cavity 1.In the lower end of pump water inlet pipe 4, be provided with a fill hose joint 5 with diameter D.
In the bottom surface 6 of water-inlet cavity 1, a convex ridge 7 is arranged, it makes one with bottom surface 6, perhaps can be a separate part that is fixed on the bottom surface.The cross-sectional form of this ridge 7 is unessential.Fig. 4 of presentation graphs 2 details X only represents the form that some is possible here.Yet importantly all cross sections should be in the preset limit of height h and width b, so that bring into play their effect of vortex under water that prevents.Numerical value with respect to pump water inlet pipe diameter D is as follows:
0.055＜h/D＜0.29
0.045＜b/D＜0.39
About the situation of cross section, dais h and width b, be equally applicable to be arranged at the convex ridge 8 on the rear wall 3, as shown in Figure 7.In indivedual, ask in the case, expect equally that wherein vortex takes place under water on rear wall, except convex ridge 7, also be provided with this convex ridge 8.This convex ridge 8 is on the central axis 9, and it is offset to the main flow direction (representing with arrow respectively in the accompanying drawings) of pump water inlet pipe 4.The length y of convex ridge 8 equals the distance H between the bottom surface 6 of water-inlet cavity 1 and the water intake of pump water inlet pipe 4 (in this case, it is made of fill hose joint 5) at least.
Following data are applicable to the expanded range X of the convex ridge 7 that is on the bottom surface 6 1And X 2, they are measured along two bearing of trends of central axis 9:
0.45＜X1/D＜∞
0.45＜X2/D＜∞
To preferential embodiment shown in Figure 3, convex ridge 7 is along a straight-line extension along main flow at Fig. 1.Have different shapes at Fig. 5 with the convex ridge 10 and 11 shown in 6, yet still produce desirable effect: be suppressed near the vortex under water that produces the bottom surface.
Except these several possible forms and structure, such as the straight ridge 10 that becomes the α angle with main flow, have outside the convex ridge 11 each other in two legs at β angle, also have many other possible modification.Like this, this convex ridge can extend along a certain circular arc or meander line, and its height, width and its cross-sectional form can vary along its length.Unique main be that the central axis 9 of this extension passes this convex ridge.
Form of ridges device of the present invention is not obscured with thin metal guide plate or the next door at first mentioned, though, they also be disposed at the pump water inlet pipe below, and, only cause the general output uniformly of pump suction stream along the direction of main flow.In fact, this next door is divided into two districts with main flow, and wherein, being suitable for producing under water, the boundary conditions of vortex occurs once more.Indicated as some tests, this thin guide metal or next door constitute they self wall district, and in this wall district, vortex can produce once more under water.
According to the present invention, even convex ridge 7,8,10 and 11 height that only have above-mentioned minimum, they also can be near the effect of the current application system that occurs bottom surface or the wall, thereby has prevented the formation of vortex on the position that may form.In this respect, often appear at the problem that sand in the water-inlet cavity is deposited on the bottom surface and can not cause the function impairment of convex ridge 7,10 and 12,, there,, a small amount of sand deposition is only arranged even under worst situation because they are on the high flow rate position.

Claims (9)

1. one kind is used to prevent at the bottom surface of centrifugal pump water-inlet cavity (1) and the device of the last vortex under water that occurs of rear wall (3), comprise the convex ridge with any desirable cross section (7) on the bottom surface (6) that is disposed at water-inlet cavity (1) and that extend along the central axis (9) of pump water inlet pipe (4), the scope (X1 and X2) that stretch the extension center of the height of convex ridge (h) and width (b) and self-pumping intake pipe (4) or (9) has the following relevant numerical value of diameter (D) of following pump water inlet pipe (4):
a)0.55＜h/D＜0.29
b)0.045＜b/D＜0.39
C)0.45＜X 1/D＜∞
d)0.45＜X 2/D＜∞
2. according to the described device of claim 1, it is characterized in that comprising that is disposed at the convex ridge with any desirable cross section (8) that is offset to pump water inlet pipe (4) main flow direction on water-inlet cavity (1) rear wall (3) and that extend along the direction of central shaft (9), height of convex ridge (h) and width (b) are in the limiting value scope that is applicable to the convex ridge (7) that is configured on the bottom surface (6), and length (y) is substantially equal to the bottom surface (6) of water-inlet cavity (1) and the distance (H) between pump water inlet pipe (4) water intake (5).
3. by claim 1 and 2 described devices, it is characterized in that comprising the L shaped convex ridge of (6) and wall (a 3) extension along the bottom surface.
4. by the described device of claim 1, it is characterized in that comprising a convex ridge that extends along main flow direction.
5. by the described device of claim 1, it is characterized in that comprising that is disposed at a convex ridge on water-inlet cavity (1) bottom surface (6) and that follow main flow angled (α) to extend.
6. by the described device of claim 1, it is characterized in that comprising a convex ridge that is disposed on water-inlet cavity (1) bottom surface (6), this convex ridge has non-directional form.
7. by the described device of claim 6, it is characterized in that convex ridge (11) has two legs, angle each other is β, and the β angle is between 90 ° and 270 °.
8. by the described device of claim 6, it is characterized in that its convex ridge is along a curve extension.
9. by claim 1 or 2 described devices, it is characterized in that comprising the convex ridge of its cross section with its length change.
CN94193425A 1993-11-30 1994-11-10 Device for preventing turbulence at pump inlets Expired - Lifetime CN1051359C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4340711A DE4340711A1 (en) 1993-11-30 1993-11-30 Device for preventing underwater vortices at pump inlets
DEP4340711.0 1993-11-30

Publications (2)

Publication Number Publication Date
CN1131453A true CN1131453A (en) 1996-09-18
CN1051359C CN1051359C (en) 2000-04-12

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ID=6503761

Family Applications (1)

Application Number Title Priority Date Filing Date
CN94193425A Expired - Lifetime CN1051359C (en) 1993-11-30 1994-11-10 Device for preventing turbulence at pump inlets

Country Status (4)

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EP (1) EP0731880B1 (en)
CN (1) CN1051359C (en)
DE (2) DE4340711A1 (en)
WO (1) WO1995015440A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102536908A (en) * 2010-12-21 2012-07-04 哈米尔顿森德斯特兰德公司 Fan shield and bearing housing for air cycle machine
CN105401616A (en) * 2015-12-18 2016-03-16 江苏省水利工程科技咨询有限公司 Underground special-shaped cover plate vortex suppression device and method for open type water inlet pool
CN105625557A (en) * 2016-01-22 2016-06-01 赛莱默(中国)有限公司 Integrated sewage treatment pump station
CN105697424A (en) * 2016-01-19 2016-06-22 江苏大学 Vortex-preventing device for pump station

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10003517C2 (en) * 2000-01-27 2001-11-22 Siemens Ag Operating building for a plant and method for operating an operating building
CN105139746B (en) * 2015-08-27 2017-06-09 武汉大学 A kind of pumping plant intake pool whirlpool experimental bench
DE202016101589U1 (en) 2016-03-23 2016-04-22 Homa Pumpenfabrik Gmbh Inlet chamber for an axial pump
JP6653204B2 (en) * 2016-03-30 2020-02-26 三菱日立パワーシステムズ株式会社 Intake pits and plants
CN106381832B (en) * 2016-09-12 2018-04-03 河海大学 A kind of whirlpool that integrates disappears whirlpool and the experimental simulation device that generates electricity

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB785926A (en) * 1955-06-03 1957-11-06 Sulzer Ag Pumping plants
DE2137637B2 (en) * 1971-07-28 1977-10-27 Klein Schanzlin & Becker Ag GUIDING DEVICE FOR INLET CHAMBERS OF FAST PUMPS
DE2933904C2 (en) * 1979-08-22 1985-03-14 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Inlet elbow
JPS61155699A (en) * 1984-12-27 1986-07-15 Fuji Electric Co Ltd Vortex preventive device of vertical shaft pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102536908A (en) * 2010-12-21 2012-07-04 哈米尔顿森德斯特兰德公司 Fan shield and bearing housing for air cycle machine
CN102536908B (en) * 2010-12-21 2014-09-24 哈米尔顿森德斯特兰德公司 Fan shield and bearing housing for air cycle machine
CN105401616A (en) * 2015-12-18 2016-03-16 江苏省水利工程科技咨询有限公司 Underground special-shaped cover plate vortex suppression device and method for open type water inlet pool
CN105401616B (en) * 2015-12-18 2017-07-25 江苏省水利工程科技咨询股份有限公司 A kind of open type intake pool special-shaped cover plate vortex reducing means and its method under water
CN105697424A (en) * 2016-01-19 2016-06-22 江苏大学 Vortex-preventing device for pump station
CN105697424B (en) * 2016-01-19 2019-01-08 江苏大学 A kind of anti-vortex device of pumping plant
CN105625557A (en) * 2016-01-22 2016-06-01 赛莱默(中国)有限公司 Integrated sewage treatment pump station
CN105625557B (en) * 2016-01-22 2018-01-12 赛莱默水处理系统（沈阳）有限公司 Integrated sewage disposal pumping plant

Also Published As

Publication number Publication date
EP0731880B1 (en) 1998-07-15
EP0731880A1 (en) 1996-09-18
DE4340711A1 (en) 1995-06-01
DE59406462D1 (en) 1998-08-20
WO1995015440A1 (en) 1995-06-08
CN1051359C (en) 2000-04-12

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