EP0731880A1 - Einrichtung zur verhinderung von unterwasserwirbeln an pumpeneinläufen - Google Patents
Einrichtung zur verhinderung von unterwasserwirbeln an pumpeneinläufenInfo
- Publication number
- EP0731880A1 EP0731880A1 EP95900701A EP95900701A EP0731880A1 EP 0731880 A1 EP0731880 A1 EP 0731880A1 EP 95900701 A EP95900701 A EP 95900701A EP 95900701 A EP95900701 A EP 95900701A EP 0731880 A1 EP0731880 A1 EP 0731880A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rib
- inlet
- inlet chamber
- pump
- pump inlet
- 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.)
- Granted
Links
Classifications
-
- 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
Definitions
- centrifugal pumps draw the medium through a vertically arranged inlet from an inlet baffle, which is also referred to as a pump sump (KSB centrifugal pump lexicon, 1989, pages 88 and 89).
- an inlet chamber primarily serves to improve the inlet conditions to the centrifugal pump, with which the aim is to achieve a flow that is as balanced as possible and without turbulence. This is essential, especially for high-speed pumps with a propeller or semi-axial wheel, because they react immediately to disturbances in the inflow.
- the actual, tubular pump inlet is usually preceded by an inlet nozzle, also called a suction bell.
- the inlet nozzle smoothes irregularities in the velocity distribution of the incoming liquid.
- Partitions, baffles and plates or vortex protection strips and beams are unable to avoid a special type of vortex which arises on the surfaces, floor and wall which delimit the inlet chamber and which are referred to as ground or underwater vortex.
- the end of such a vortex bound to the floor or wall surface moves back and forth in a certain area, while the other end pulls into the pump. Since the speed of rotation in the center of the underwater vortex is very high, the static pressure there drops below the vapor pressure of the medium, with the result that the vortex is formed as a tube filled with steam.
- inlet cones In order to avoid underwater eddies, inlet cones have mainly been used so far.
- the already cited references “KSB centrifugal pump lexicon” and “DVWK writings” show such Inlet cones that represent deflection devices that are firmly anchored to the bottom of the inlet chamber and that are arranged directly in front of the inlet nozzle.
- Another known precaution to prevent underwater eddies is to provide the surfaces of the inlet chamber adjacent to the pump inlet with a cladding or profiling by which the previously smooth surface is frequently interrupted (WO 92/11460).
- the aim of the invention is to reduce the effort required to prevent underwater eddies to a minimum. This is achieved by a device that is shown in claim 1 with its design limits.
- the diameter (D) given here as the reference variable is not the diameter of the inlet nozzle, but that of the tubular pump inlet located above the inlet nozzle.
- the invention is based on the following finding:
- Underwater vortices are created under roughly the same conditions as cyclones in the earth's atmosphere. A more or less random shear of the medium flowing at different speeds in neighboring areas is present on the ground. This can develop a potential that causes the medium to rotate parallel to the ground. If, in the vicinity of this phenomenon, there is a point which acts as a sink in the fluid-technical sense and into which the flow medium is moved or accelerated, an originally slight rotation takes the form of a vortex. Such a sink is the suction pipe of the pump inlet in the case of the pump inlet chamber. In order to prevent the formation of a vortex, the flow close to the floor or near the wall must be disturbed to the extent that a local rotary movement cannot develop.
- Claim 2 calls as an additional device a rib arranged on the rear wall of the inlet chamber, the height and width of which remain within the limit values applicable to the rib arranged on the bottom.
- the bottom and wall rib can be combined into a single, L-shaped rib.
- Rib if this runs in the direction of the main stream according to claim 4. However, as stated in claim 5, the rib can also run at an angle to the main stream.
- the rib does not have to form a straight line; their course can deviate from a straight line according to claim 6. This can mean, inter alia, that the rib, as taught in claim 7, consists of two legs at an angle to one another or that it extends in a curved line according to claim 8. In claim 9 it is pointed out that the cross section of the rib can change over its course.
- Fig. 4 different possible cross-sectional shapes of the rib arranged on the bottom or the rear wall of the inlet chamber, in
- Fig. 7 shows an alternative embodiment of the device according to the invention on the bottom and the wall of the
- Inlet arranged ribs Inlet arranged ribs.
- the inlet chamber 1 shown in FIGS. 1 to 3 is formed between two side walls 2 and a rear wall 3.
- the vertically arranged suction pipe of a pump inlet 4 projects into the inlet chamber 1.
- an inlet nozzle 5 is provided at the lower end of the pump inlet 4, which has a diameter D.
- a rib 7 which can be made in one piece with the bottom 6 or attached to it as a separate part.
- the cross-sectional shape of the rib 7 is arbitrary.
- the FIG. 4 corresponding to the detail x of FIG. 2 shows only some of the possible forms here. It is essential, however, that all cross sections must remain within predetermined limits for the height h and width b in order to be able to develop their underwater vortex-preventing effect.
- the values related to the diameter D of the pump inlet are: 0.055 ⁇ h / D ⁇ 0.29 0.045 ⁇ b / D ⁇ 0.39.
- a rib 8 arranged on the rear wall 3, as shown in FIG. 7.
- a rib 8 is provided in addition to the rib 7.
- the rib 8 is located on the central axis 9 of the pump inlet 4 offset in the direction of the main flow (indicated by an arrow in the drawing).
- the length y of the rib 8 corresponds at least to the distance H between the bottom 6 of the inlet chamber 1 and the inlet opening of the Pump inlet 4, which is formed here by the inlet nozzle 5.
- the rib 7 runs in a straight line following the main flow.
- the ribs 10 and 11 shown in FIGS. 5 and 6 have a different course, but also lead to the desired success: suppression of underwater vortices arising in the bottom area.
- rib 11 In addition to the shapes and courses shown, rectilinear rib 10 at an angle ⁇ to the main stream, rib 11 with legs at an angle ⁇ to one another, a large number of further variants are possible. So the rib can run in an arc or in a serpentine line; their height, their width and their cross-sectional shape can change over the course. The only important thing is that it remains within the limits specified in the claims and that the elongated central axis 9 extends through the rib.
- the rib-shaped device according to the invention is not to be confused with the baffles or partitions mentioned at the beginning, which are also attached below the pump inlet with an orientation in the main flow direction, but which only bring about a general equalization of the pump inflow.
- the main flow is divided into two areas by partitions, in each of which the boundary conditions for the formation of underwater vortices occur again.
- the baffles or partitions form their own wall areas, which in turn can create underwater vortices.
- the ribs 7, 8, 10 and 11 according to the invention even if they only have the specified minimum height, exert a targeted influence on the flow near the floor or wall and prevent eddy formation at the possible point of origin.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4340711A DE4340711A1 (de) | 1993-11-30 | 1993-11-30 | Einrichtung zur Verhinderung von Unterwasserwirbeln an Pumpeneinläufen |
DE4340711 | 1993-11-30 | ||
PCT/EP1994/003720 WO1995015440A1 (de) | 1993-11-30 | 1994-11-10 | Einrichtung zur verhinderung von unterwasserwirbeln an pumpeneinläufen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0731880A1 true EP0731880A1 (de) | 1996-09-18 |
EP0731880B1 EP0731880B1 (de) | 1998-07-15 |
Family
ID=6503761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95900701A Expired - Lifetime EP0731880B1 (de) | 1993-11-30 | 1994-11-10 | Einrichtung zur verhinderung von unterwasserwirbeln an pumpeneinläufen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0731880B1 (de) |
CN (1) | CN1051359C (de) |
DE (2) | DE4340711A1 (de) |
WO (1) | WO1995015440A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10003517C2 (de) * | 2000-01-27 | 2001-11-22 | Siemens Ag | Betriebsgebäude für eine Anlage und Verfahren zum Betrieb eines Betriebsgebäudes |
US8784053B2 (en) * | 2010-12-21 | 2014-07-22 | Hamilton Sundstrand Corporation | Fan shield and bearing housing for air cycle machine |
CN105139746B (zh) * | 2015-08-27 | 2017-06-09 | 武汉大学 | 一种泵站进水池漩涡实验台 |
CN105401616B (zh) * | 2015-12-18 | 2017-07-25 | 江苏省水利工程科技咨询股份有限公司 | 一种开敞式进水池水下异形盖板消涡装置及其方法 |
CN105697424B (zh) * | 2016-01-19 | 2019-01-08 | 江苏大学 | 一种泵站用防旋涡装置 |
CN105625557B (zh) * | 2016-01-22 | 2018-01-12 | 赛莱默水处理系统(沈阳)有限公司 | 一体化污水处理泵站 |
DE202016101589U1 (de) | 2016-03-23 | 2016-04-22 | Homa Pumpenfabrik Gmbh | Einlaufkammer für eine Axialpumpe |
JP6653204B2 (ja) * | 2016-03-30 | 2020-02-26 | 三菱日立パワーシステムズ株式会社 | 取水ピット及びプラント |
CN106381832B (zh) * | 2016-09-12 | 2018-04-03 | 河海大学 | 一种集漩涡消涡和发电于一体的实验模拟装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB785926A (en) * | 1955-06-03 | 1957-11-06 | Sulzer Ag | Pumping plants |
DE2137637B2 (de) * | 1971-07-28 | 1977-10-27 | Klein Schanzlin & Becker Ag | Leitvorrichtung fuer einlaufkammern schnellaeufiger pumpen |
DE2933904C2 (de) * | 1979-08-22 | 1985-03-14 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | Einlaufkrümmer |
JPS61155699A (ja) * | 1984-12-27 | 1986-07-15 | Fuji Electric Co Ltd | 立軸ポンプの渦流防止装置 |
-
1993
- 1993-11-30 DE DE4340711A patent/DE4340711A1/de not_active Withdrawn
-
1994
- 1994-11-10 DE DE59406462T patent/DE59406462D1/de not_active Expired - Lifetime
- 1994-11-10 WO PCT/EP1994/003720 patent/WO1995015440A1/de active IP Right Grant
- 1994-11-10 EP EP95900701A patent/EP0731880B1/de not_active Expired - Lifetime
- 1994-11-10 CN CN94193425A patent/CN1051359C/zh not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9515440A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1995015440A1 (de) | 1995-06-08 |
EP0731880B1 (de) | 1998-07-15 |
DE4340711A1 (de) | 1995-06-01 |
CN1051359C (zh) | 2000-04-12 |
DE59406462D1 (de) | 1998-08-20 |
CN1131453A (zh) | 1996-09-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69903196T2 (de) | Vorrichtung zum behandeln einer gas/flüssigkeits-mischung | |
DE69105418T2 (de) | Schaufelgitter für Turbomaschinen mit Saugschlitzen. | |
DE1817430A1 (de) | Regenerativkompressor | |
EP0985098B1 (de) | Kreiselpumpe mit einer einlaufleiteinrichtung | |
DE202011000439U1 (de) | Vordüse für ein Antriebssystem eines Wasserfahrzeuges zur Verbesserung der Energieeffizienz | |
EP0731880B1 (de) | Einrichtung zur verhinderung von unterwasserwirbeln an pumpeneinläufen | |
DE10105570B4 (de) | Windkraftmaschine | |
DE69105613T2 (de) | Impulsturbinenstufe mit verminderten Strömungsverlusten. | |
DE3843428C2 (de) | Kreiselpumpenlaufrad geringer spezifischer Drehzahl | |
DE1108374B (de) | Einrichtung zur Vermeidung von Sekundaerstroemungen in Schaufelkanaelen von Stroemungsmaschinen | |
DE2414610B2 (de) | Querstromlüfter | |
EP1616100B1 (de) | Freistrompumpe | |
EP1250532B1 (de) | Betriebsgebäude für eine anlage und verfahren zum betrieb eines betriebsgebäudes | |
DE1262234B (de) | Drehstroemungswirbler zum Abscheiden fester oder fluessiger Teilchen aus Gasen | |
DE2903277A1 (de) | Schraubenpumpe, insbesondere zur foerderung von abwasser u.dgl. | |
DE2437001A1 (de) | Radialgeblaese | |
DE3403547C2 (de) | Luftschleuse in einem Gebäudeeingang | |
DE102018132978A1 (de) | Turboverdichter mit angepasster Meridiankontur der Schaufeln und Verdichterwand | |
DE4314478A1 (de) | Einlaufgehäuse für Kreiselpumpen | |
AT207088B (de) | Abschirmung von Raumöffnungen durch einen Luftschleier | |
DE20214291U1 (de) | Rühr-Vorrichtung für hochviskose Medien | |
DE1235343B (de) | Rieselkuehler mit Luftleitflaechen | |
DE2305710A1 (de) | Venturi-rieselturm mit veraenderlicher engstelle | |
DE3326592C2 (de) | ||
AT284637B (de) | Saugkrümmer für Kreiselpumpen |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19960418 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB NL |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
17Q | First examination report despatched |
Effective date: 19971222 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB NL |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19980715 Ref country code: FR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19980715 |
|
REF | Corresponds to: |
Ref document number: 59406462 Country of ref document: DE Date of ref document: 19980820 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19980915 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
EN | Fr: translation not filed | ||
PLBQ | Unpublished change to opponent data |
Free format text: ORIGINAL CODE: EPIDOS OPPO |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
26 | Opposition filed |
Opponent name: ITT FLYGT AB Effective date: 19990315 |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBF | Reply of patent proprietor to notice(s) of opposition |
Free format text: ORIGINAL CODE: EPIDOS OBSO |
|
PLBO | Opposition rejected |
Free format text: ORIGINAL CODE: EPIDOS REJO |
|
PLBN | Opposition rejected |
Free format text: ORIGINAL CODE: 0009273 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: OPPOSITION REJECTED |
|
27O | Opposition rejected |
Effective date: 20000820 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20131106 Year of fee payment: 20 Ref country code: GB Payment date: 20131120 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 59406462 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 59406462 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20141109 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20141109 |