EP0624731A1 - Carter d'admission pour pompes centrifuges - Google Patents

Carter d'admission pour pompes centrifuges Download PDF

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Publication number
EP0624731A1
EP0624731A1 EP94106576A EP94106576A EP0624731A1 EP 0624731 A1 EP0624731 A1 EP 0624731A1 EP 94106576 A EP94106576 A EP 94106576A EP 94106576 A EP94106576 A EP 94106576A EP 0624731 A1 EP0624731 A1 EP 0624731A1
Authority
EP
European Patent Office
Prior art keywords
inlet
pump
funnel
housing
housing according
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.)
Withdrawn
Application number
EP94106576A
Other languages
German (de)
English (en)
Inventor
Gérard Lefebvre
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.)
KSB AG
Original Assignee
KSB AG
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 KSB AG filed Critical KSB AG
Publication of EP0624731A1 publication Critical patent/EP0624731A1/fr
Withdrawn legal-status Critical Current

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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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Definitions

  • the invention relates to an inlet housing for centrifugal pumps, for example tubular housing pumps, consisting essentially of a flange for connection to a pump housing and an inlet funnel.
  • nozzle-shaped inlet housing parts in particular in the case of vertically installed tubular housing pumps, to even out the speed distribution (KSB centrifugal pump lexicon, 3rd edition, Frankenthal 1989, pages 86, 163, 164).
  • Such an inlet housing is usually referred to as an inlet nozzle or suction bell.
  • the shape of the inlet nozzle is calculated on the basis of the operating point of the delivery flow Q N. Pumps designed in this way function satisfactorily even when the flow rate is reduced to 0.7 Q N. Below this operating point, however, there are disturbances in the inflow, since the backflow from the impeller reaches the inlet cross or the pre-swirl regulator.
  • a swirl-free inflow that is balanced on all sides is aimed at by constructing a section of the building that is directly upstream of the pump and is referred to as the inlet chamber.
  • the foundation depth of the inlet chamber to maintain the necessary coverage and to maintain a minimum distance from the bottom of the inlet chamber is a decisive cost factor when installing such systems.
  • the invention has for its object to provide an inlet housing that enables a compact design and creates suitable inlet conditions for the operation of the pump.
  • the inlet funnel has perforated side walls widening towards its inlet opening.
  • the inlet properties to the inlet of the pump are also improved.
  • the feed rate at the inlet opening of the inlet funnel is reduced by the invention.
  • the resulting reduction in the required coverage can certainly reach a value corresponding to the diameter of the inlet opening of the pump.
  • the head When operating against the closed slide, the head is reduced by the inventive design. This lowers the pressure resistance requirements of the system.
  • the reduction in pressure fluctuations in the inflow of the pump also has a particularly advantageous effect in part-load operation.
  • filter devices are often provided in conventional pumps.
  • this filter device will consist of a filter basket attached in front of the inlet nozzle.
  • a disadvantage is that the inflow into the inlet nozzle is severely disturbed by the filter basket. From a hydraulic point of view, a filter device that is as far away from the inlet nozzle as possible would be desirable.
  • Another disadvantage of this arrangement is the increased space requirement, since the filter basket is approximately one to two times the diameter of the inlet opening of the pump. This disadvantage weighs heavily because the inlet chamber has to be dug deeper.
  • An anchoring device anchored to the bottom of the inlet chamber of the flow e.g. B. an inlet cone, can hardly be used due to the filter basket, since this must be arranged directly in front of the inlet nozzle. This means that the inflow conditions can only be realized very inadequately.
  • the inlet funnel with a grille which prevents contaminants from entering the pump.
  • the compact design is retained.
  • the distance between the inlet opening of the pump and the bottom of the inlet chamber can be reduced by up to twice the diameter of the inlet opening of the pump. A significant weight reduction is also achieved.
  • the pressure loss caused by the grille goes to zero and is therefore negligible.
  • the inlet funnel is stiffened by support ribs.
  • the supporting ribs can serve to support a shaft guide bearing for a pump shaft that projects into the inlet funnel and can be made in one piece.
  • the struts can be designed so that an inlet cross arises.
  • the further development with a conical inlet funnel has the advantage that it is simple, e.g. B. can be produced by bending perforated standard sheets. Contrary to the known nozzle-shaped inlet funnels, one direction of curvature is sufficient to obtain improved inlet properties.
  • the opening angle of the inlet funnel depends on the proportion of the perforated surface, i.e. the holes, on the total surface of the side wall.
  • a preferred area for realizing the invention is an inlet angle of 15 to 45 ° with an area fraction of 60 to 20%.
  • a particularly suitable version is the combination of an opening angle of 30 ° with a 40% permeable side wall of the inlet funnel.
  • the object of the invention can be operated in pumps with front-mounted rotors, also called inducers.
  • the front rotor As the front rotor is designed for an increased flow compared to the pump impeller, it always runs in partial load operation and always causes a backflow. This backflow can significantly impair the operation of the pump, especially under conditions deviating from the design point, and can be responsible for permanent damage.
  • the backflow generated by the front runner can emerge from the inlet funnel. This prevents cavitation damage and significantly improves the smoothness of the pump.
  • an inlet funnel 1 is connected to the pump casing 2 of a pipe casing pump by means of screws 3.
  • the inlet funnel 1 consists of a connecting flange 4 and an inlet funnel 5, which is stiffened by supporting ribs 6.
  • the support ribs 6 have a radial extension, which is referred to as a strut 7.
  • the one-piece component formed from support ribs 6 and strut 7 has the shape of an L.
  • the perforated side wall of the inlet funnel 5 consists of several segments, which are each arranged between the support ribs 6.
  • the struts 7 extend in the direction of the central axis 8 and meet on a bearing housing 9 of a shaft guide bearing for the shaft 10. They represent an inlet cross and bring about a certain rectification of the flow.
  • the inlet funnel 5 is shown in a side view.
  • the side wall has perforated surfaces 12 in the form of holes.
  • the diameter of these holes is, for example, 30 mm with a hole spacing of 60 mm, which corresponds to an area share of 22.67%.
  • the opening angle is 36 °.
  • the inlet opening of the inlet funnel 5 is provided with a lattice 13 made of parallel lattice bars through which a wide-mesh wire mesh 14 is supported.
  • a perforated sheet can also be used.
  • the pump sucks in the pumping material mainly through the inlet opening of the inlet funnel.
  • a part of the funding can also flow through the perforated side wall into the inlet funnel. This behavior corresponds to a fluidic increase in the opening angle of the funnel.
  • an inlet housing part according to the invention has important effects on the design of a section of the building erected in front of the centrifugal pump, as a rule an inlet chamber.
  • the invention is particularly suitable for use in wet-type pipe housing pumps in which the inlet housing, here the inlet funnel, projects into an inlet chamber, but is not restricted to this.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP94106576A 1993-05-03 1994-04-27 Carter d'admission pour pompes centrifuges Withdrawn EP0624731A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4314478A DE4314478A1 (de) 1993-05-03 1993-05-03 Einlaufgehäuse für Kreiselpumpen
DE4314478 1993-05-03

Publications (1)

Publication Number Publication Date
EP0624731A1 true EP0624731A1 (fr) 1994-11-17

Family

ID=6486975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94106576A Withdrawn EP0624731A1 (fr) 1993-05-03 1994-04-27 Carter d'admission pour pompes centrifuges

Country Status (4)

Country Link
US (1) US5501572A (fr)
EP (1) EP0624731A1 (fr)
JP (1) JPH07133800A (fr)
DE (1) DE4314478A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104832448A (zh) * 2015-05-07 2015-08-12 哈尔滨电气动力装备有限公司 离心泵水力部件结构

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005155566A (ja) * 2003-11-28 2005-06-16 Mitsubishi Heavy Ind Ltd 斜流圧縮機のインペラ
EP1898100A1 (fr) * 2006-08-18 2008-03-12 H.H. Idé v/ Henrik Hoffmann Dispositif de guidage de fluide
JP4867637B2 (ja) * 2006-12-21 2012-02-01 株式会社Ｉｈｉ 剥離抑制装置
JP2017172379A (ja) * 2016-03-22 2017-09-28 株式会社荏原製作所 ストレーナおよびストレーナ付き立軸ポンプ

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB114366A (en) * 1917-06-09 1918-04-04 Robert Edward Hoffmann Improvements in or relating to Centrifugal, Turbine or similar Pumps.
US2210977A (en) * 1937-12-08 1940-08-13 Byron Jackson Co Strainer for submersible motor pumps
US2627816A (en) * 1948-04-01 1953-02-10 Herbert W Kaatz Pump
US3012514A (en) * 1958-05-28 1961-12-12 Albert Benjamin Cady Jr Pump having radial intake and centrifugal discharge
US3041978A (en) * 1960-01-15 1962-07-03 Gen Electric Evaporative cooler
DE3038735C2 (de) * 1979-03-19 1986-02-27 Anatolij Semenovič Moskau/Moskva Šapiro Kreiselpumpe
DE3730567A1 (de) * 1987-09-11 1989-03-23 Vdo Schindling Fluessigkeitspumpe
JPH0385400A (ja) * 1989-08-25 1991-04-10 Kubota Corp 立軸ポンプ
JPH03121293A (ja) * 1989-10-05 1991-05-23 Toshiba Corp 原子炉内蔵型循環ポンプ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB593294A (en) * 1946-05-30 1947-10-14 Dudley George Jones Improvements in and relating to pumps and pumping apparatus
JPS5418038B2 (fr) * 1971-09-12 1979-07-04
US4808090A (en) * 1983-02-10 1989-02-28 The Scott & Fetzer Company Vacuum motor fan cover
US4838759A (en) * 1987-04-10 1989-06-13 Rockwell International Corporation Cavitation-resistant inducer
DE4041551A1 (de) * 1990-12-22 1992-06-25 Abs Pumpen Ag Verfahren zur vermeidung von grundwirbeln an pumpeneinlaeufen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB114366A (en) * 1917-06-09 1918-04-04 Robert Edward Hoffmann Improvements in or relating to Centrifugal, Turbine or similar Pumps.
US2210977A (en) * 1937-12-08 1940-08-13 Byron Jackson Co Strainer for submersible motor pumps
US2627816A (en) * 1948-04-01 1953-02-10 Herbert W Kaatz Pump
US3012514A (en) * 1958-05-28 1961-12-12 Albert Benjamin Cady Jr Pump having radial intake and centrifugal discharge
US3041978A (en) * 1960-01-15 1962-07-03 Gen Electric Evaporative cooler
DE3038735C2 (de) * 1979-03-19 1986-02-27 Anatolij Semenovič Moskau/Moskva Šapiro Kreiselpumpe
DE3730567A1 (de) * 1987-09-11 1989-03-23 Vdo Schindling Fluessigkeitspumpe
JPH0385400A (ja) * 1989-08-25 1991-04-10 Kubota Corp 立軸ポンプ
JPH03121293A (ja) * 1989-10-05 1991-05-23 Toshiba Corp 原子炉内蔵型循環ポンプ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 260 (M - 1131)<4788> 2 July 1991 (1991-07-02) *
PATENT ABSTRACTS OF JAPAN vol. 15, no. 321 (M - 1147)<4849> 15 August 1991 (1991-08-15) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104832448A (zh) * 2015-05-07 2015-08-12 哈尔滨电气动力装备有限公司 离心泵水力部件结构

Also Published As

Publication number Publication date
DE4314478A1 (de) 1994-11-10
US5501572A (en) 1996-03-26
JPH07133800A (ja) 1995-05-23

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