US3820570A - Suction bend conduit for use with centrifugal pumps - Google Patents

Suction bend conduit for use with centrifugal pumps Download PDF

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Publication number
US3820570A
US3820570A US00272911A US27291172A US3820570A US 3820570 A US3820570 A US 3820570A US 00272911 A US00272911 A US 00272911A US 27291172 A US27291172 A US 27291172A US 3820570 A US3820570 A US 3820570A
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United States
Prior art keywords
conduit
suction bend
guide vanes
fluid
passage
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.)
Expired - Lifetime
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US00272911A
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English (en)
Inventor
E Holzhuter
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.)
Klein Schanzlin and Becker AG
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Klein Schanzlin and Becker AG
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Filing date
Publication date
Priority claimed from DE19712135097 external-priority patent/DE2135097C/de
Application filed by Klein Schanzlin and Becker AG filed Critical Klein Schanzlin and Becker AG
Application granted granted Critical
Publication of US3820570A publication Critical patent/US3820570A/en
Anticipated expiration legal-status Critical
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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
    • F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps

Definitions

  • a tubular curved conduit body is provided with an inlet and an outlet, the latter to be connected with the intake of a centrifugal pump.
  • One or more guide vanes extend across'the passage of the conduit intermediate the inlet and outlet and are each composed of two sections fast with the conduit body at diametrally opposite locations and having inner ends which extend toward but are spaced from one another.
  • the present invention relates to conduits, and in particular to suction bend conduits for use with centrifugal pumps. Still more particularly the invention relates to a suction bend conduit for use with centrifugal pumps having a high system pressure.
  • Suction bend conduits for use with centrifugal pumps are known per se. Their purpose is to be connected with the intake of the pump, so that the fluid for the pump is supplied through the suction bend conduit.
  • the particular reason for the provision of such suction bend conduits is to reduce the flow losses and/or to equalize the flow speed profile of the fluid as it issues from the suction bend conduit into the pump.
  • the suction bend conduits according to the prior art are provided with guide vanes which deflect the fluid and cause it to change its direction during the movement of the fluid through the suction bend conduit.
  • these guide vanes thus are advantageous in certain applications, there are also situations where they can be disadvantageous.
  • these guide vanes have drawbacks if they are used in suction bendconduits which are under high internal pressure and if the guide vanes are either arranged in form of a grid of intersecting guide vanes or under some circumstances even if the guide vanes all extend in one and the same direction across the passage of the suction bend conduit. The reason for this is that there develops the so-called tie rodeffect which causes locally high crest peaks in the wall of the suction bend conduit.
  • suction bend conduits with guide vanes are of importance, for instance they are used in the main cooling fluid conduits for the pumps in atomic reactors where the safety requirements are particularly high.
  • the use of suction bend conduits provided with guide vanes is essential because the cross-section of the pump intake and that of the fluid supply conduit must for safety reasons be no greater than the cross section of the suction bend conduit outlet, and because furtherthe amount of cooling fluid (usually water) which is present in the conduits.
  • a suction bend conduit for use with centrifugal pumps, comprising a tubular curved conduit body having an interior passage provided with an inlet and with an outlet which is adapted to be connected with the intake of a centrifugal pump.
  • At least one guide vane is also provided, extending across the passage intermediate the inlet and the outlet and being composed of two sections having respective outer end portions fast with the conduit body and inner end portions which are spaced from one another in direction transversely of the passage.
  • the guide vane or vanes are not of one piece but of two, being transversely subdivided. This measure assures that the tie rod effect is eliminated. Moreover, the manufacture of this suction bend conduit can now be effected in the same manner in which suction bend conduits without guide-vanes are produced, because each guide vane section can be welded into a respective suction bend conduit half before the two halvesofthe conduit are welded together.
  • the thickness of the guide vanes can be determined by appropriate profile configuration of the guide vanes, in accordance with considerations of vibratory problems without having to accept hydrodynamic disadvantages.
  • the known grid-shaped arrangement of the guide vanes limits the thickness of the guide vanes due to hydrodynamic considerations resulting from the construction effect of grid-shaped arrangements.
  • FIG. 1 is a diagrammatic plan view, partly shown in phantom lines, illustrating an embodiment of the invention
  • FIG. 2 is a section taken on line A-B of FIG. 1;
  • FIG. 3 is a diagrammatic axial section through a further embodiment of the invention.
  • FIG. 4 is an end view of FIG. 3.
  • FIGS. 1 and 2 DESCRIPTION OF THE PREFERRED EMBODIMENTS Discussing firstly the embodiment in FIGS. 1 and 2 it will be seen that here a suction bend conduit is illustrated having an inlet portion 1 and an outlet portion 3.
  • the inlet portion 1 would'be connected with a suitable supply of fluid and the outlet portion 3 would be connected with the intake of a centrifugal pump.
  • Located in the suction bend conduit 1, 3 are transversely extending guide vanes 2 which are curved in the direction of fluid flow in order to impart an appropriate flow to the fluid.
  • each of the transversely extending guide vanes 2 is composed of two guide vane sections 2 one of which is secured by welding or otherwise to the wall of the suction bend conduit at one side and the other of which is secured to the same wall at the diametrally opposite side.
  • the sections 2 have inner free ends which are located adjacent one another but are spaced. In other words, and as shown in FIG. 2, the free ends of the sections 2' are not connected but define with one another a gap.
  • FIGS. 3 and 4 A further embodiment is illustrated in FIGS. 3 and 4 where the suction bend conduit is shown as having a plurality of transversely extending guide vanes 2a, 2b and 20.
  • the number may vary but it will be noticed that here again they extend transversely of the interior of the suction bend conduit intermediate the inlet end 1 and the outlet end 3, being spaced longitudinally of one another along the elongation of the suction bend conduit.
  • each of the guide vanes (only the guide vane 2a is shown in FIG. 4) is composed of two guide vane sections 2'a which again define with their inner free ends a gap, meaning that these inner free ends are not connected with one another.
  • suction bend conduits without guide vanes can be employed in suction bend conduits provided with guide vanes according to the present invention.
  • the suction bend conduit is composed of three sections, namely an inlet section, an outlet section extending at right angles to the inlet section and an intermediate section which is welded together with the inlet and outlet sections and interposed between them.
  • the grid of guide vanes is welded into the intermediate section.
  • a further advantage according to the present invention is the fact that if the suction bend conduit has a relatively substantial internal diameter, and'is interposed in a conduit sufficiently large to permit entry of a human operator, the invention makes it possible for the operator to enter and pass through the suction bend conduit itself as long as the suction bend conduit has an internal diameter of approximately 800 mm or more.
  • a suction bend conduit for use with pumps, particularly centrifugal pumps comprising a tubular conduit body having an interior passage, said conduit body including an inlet part for the admission of a fluid flowing in a first direction, an outlet part for the discharge of said fluid in a different second direction, and an intermediate part for changing the direction of flow of said fluid from said first direction to said second direction, said outlet part being adapted to be connected with the intake of a pump; and at least one row of guide vanes extending across said passage in said intermediate part and each vane being arcuate in a sense between said first and second direction so as to aid in changing the direction of flow of said fluid, each guide vane in said row of guide vanescomprising two separate sections having respective outer end portions fast with said conduit body and inner end portions which are spaced from one another in a direction transversely of said passage so as to define a gap, and said sections having a combined length in transverse direction of said passage which exceeds the width of said gap.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00272911A 1971-07-14 1972-07-13 Suction bend conduit for use with centrifugal pumps Expired - Lifetime US3820570A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712135097 DE2135097C (de) 1971-07-14 Saugkrummer fur Kreiselpumpen

Publications (1)

Publication Number Publication Date
US3820570A true US3820570A (en) 1974-06-28

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ID=5813605

Family Applications (1)

Application Number Title Priority Date Filing Date
US00272911A Expired - Lifetime US3820570A (en) 1971-07-14 1972-07-13 Suction bend conduit for use with centrifugal pumps

Country Status (3)

Country Link
US (1) US3820570A (enExample)
AT (1) AT314983B (enExample)
SE (1) SE372800B (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019537A (en) * 1974-03-28 1977-04-26 Bertin & Cie Arrangement for mounting guide vanes or other transverse objects inside a conduit
US4080997A (en) * 1975-09-16 1978-03-28 Sulzer Brothers Limited Flow straightener for a liquid flow
US4310028A (en) * 1975-04-14 1982-01-12 Patriark, Inc. Method and apparatus for increasing the fluid throughput of a conduit
US4380085A (en) * 1979-04-04 1983-04-12 Hochtemperatur-Reaktorbau Gmbh Angled gas conduit
US4648791A (en) * 1984-06-30 1987-03-10 Bbc Brown, Boveri & Company, Limited Rotor, consisting essentially of a disc requiring cooling and of a drum
US5624573A (en) * 1994-05-17 1997-04-29 Wiesmann; Rudolf Apparatus for the disinfection of a flowing liquid medium and a plant for the treatment of clarified sewage
US6086241A (en) * 1993-07-14 2000-07-11 Siemens Aktiengesellschaft Combined mixing and deflection unit
US20030131897A1 (en) * 2002-01-14 2003-07-17 Siemens Vdo Automotive, Inc. Bifurcated duct for a vehicle induction system
US20040035944A1 (en) * 2001-10-24 2004-02-26 Eveleigh Robert B. Thermostatic control valve with fluid mixing
US10844887B1 (en) * 2020-05-19 2020-11-24 Vortex Pipe Systems LLC Fluid flow enhancing device and culvert comprising same

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019537A (en) * 1974-03-28 1977-04-26 Bertin & Cie Arrangement for mounting guide vanes or other transverse objects inside a conduit
US4310028A (en) * 1975-04-14 1982-01-12 Patriark, Inc. Method and apparatus for increasing the fluid throughput of a conduit
US4080997A (en) * 1975-09-16 1978-03-28 Sulzer Brothers Limited Flow straightener for a liquid flow
US4380085A (en) * 1979-04-04 1983-04-12 Hochtemperatur-Reaktorbau Gmbh Angled gas conduit
US4648791A (en) * 1984-06-30 1987-03-10 Bbc Brown, Boveri & Company, Limited Rotor, consisting essentially of a disc requiring cooling and of a drum
US6086241A (en) * 1993-07-14 2000-07-11 Siemens Aktiengesellschaft Combined mixing and deflection unit
US5624573A (en) * 1994-05-17 1997-04-29 Wiesmann; Rudolf Apparatus for the disinfection of a flowing liquid medium and a plant for the treatment of clarified sewage
US20040035944A1 (en) * 2001-10-24 2004-02-26 Eveleigh Robert B. Thermostatic control valve with fluid mixing
US20040084541A1 (en) * 2001-10-24 2004-05-06 Eveleigh Robert B. Thermostatic control valve with fluid mixing
US7140394B2 (en) * 2001-10-24 2006-11-28 Magarl, Llc Thermostatic control valve with fluid mixing
US20030131897A1 (en) * 2002-01-14 2003-07-17 Siemens Vdo Automotive, Inc. Bifurcated duct for a vehicle induction system
US10844887B1 (en) * 2020-05-19 2020-11-24 Vortex Pipe Systems LLC Fluid flow enhancing device and culvert comprising same
US11293464B2 (en) 2020-05-19 2022-04-05 Vortex Pipe Systems LLC Fluid flow enhancing device and culvert comprising same

Also Published As

Publication number Publication date
DE2135097B2 (de) 1972-11-23
AT314983B (de) 1974-05-10
DE2135097A1 (enExample) 1972-11-23
SE372800B (enExample) 1975-01-13

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