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EP0257358B1 - Hydraulic sealing ring on the inlet of the impeller in single-stage and multistage pumps - Google Patents

Hydraulic sealing ring on the inlet of the impeller in single-stage and multistage pumps Download PDF

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Publication number
EP0257358B1
EP0257358B1 EP87111178A EP87111178A EP0257358B1 EP 0257358 B1 EP0257358 B1 EP 0257358B1 EP 87111178 A EP87111178 A EP 87111178A EP 87111178 A EP87111178 A EP 87111178A EP 0257358 B1 EP0257358 B1 EP 0257358B1
Authority
EP
European Patent Office
Prior art keywords
impeller
ring
inlet
sealing ring
shimming
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
Application number
EP87111178A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0257358A3 (en
EP0257358A2 (en
Inventor
Primo Lovisetto
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.)
Lowara SRL
Original Assignee
Lowara SRL
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 Lowara SRL filed Critical Lowara SRL
Priority to AT87111178T priority Critical patent/ATE65116T1/de
Publication of EP0257358A2 publication Critical patent/EP0257358A2/en
Publication of EP0257358A3 publication Critical patent/EP0257358A3/en
Application granted granted Critical
Publication of EP0257358B1 publication Critical patent/EP0257358B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type

Definitions

  • the present invention relates to a hydraulic sealing ring on the inlet of the impeller in single-stage and multistage pumps.
  • centrifugal pumps in which the element which imparts energy to the liquid consists of one or more impellers, there is always a limited external surface of the inlet of the rotor part (the impeller) which interfaces a corresponding inner surface of a box-like (fixed) part between which play is reduced to the minimum practical value.
  • Said interfacing surfaces which act as separating boundaries between the chamber at the inlet of the blades of each impeller (hereinafter termed upstream chamber) and the chamber at the outlet of the blades of each impeller (hereinafter termed downstream chamber), are known as shimming surfaces.
  • a pressure differential occurs between the downstream chamber of the impeller and the upstream chamber due to the amount of energy imparted to the liquid by the impeller.
  • sealing rings in rubber-like material having a small shimming surface
  • EP-A-85107012.8 filed on June and US-A-3741674 such as "OR" rings accommodated in seats connected by holes or channels to the liquid in the delivery chamber to cause the liquid pressure acting on the outer side of the ring to generate thereon radial forces tending to keep the ring elastically adherent to the inlet of the impeller.
  • DE-A-3 207 327 discloses a sealing ring having a rubber- like ring element engaging a rotating shaft; radial pins are partially inserted in the rubber-like ring element and engage in radial holes of the sealing ring.
  • the aim of the present invention is to provide an elastomeric ring adapted to eliminate the disadvantages described above yet maintain unchanged all the advantages offered by "OR"-type shimming rings applied to low-pressure pumps.
  • a second object is to provide an elastomeric ring which can be easily adapted to the ordinary structures of singlestage and multistage pumps.
  • Still another object is to provide a ring with a simple structure which can be easily produced.
  • a hydraulic sealing ring on the inlet of the impeller particularly for singlestage and multistage pumps, consisting of an adapted rubberlike material the inner face whereof of the ring-like structure couples to the outer surface of the inlet of an impeller, characterized in that said ring has substantially radial openings which connect the shimming face to the outer one.
  • This provision which is the fundamental object of the invention, consists of said radial openings with circular or elongated cross section, distributed along the ring, which allow a greater lubrication of the shimming region, determined by the recirculation of pressurized liquid originating from the output of the blades of the impeller.
  • Said liquid generates a counterpressure which balances the centripetal radial force of adherence to the inlet up to a state of hydrodynamic balance, the optimum achievement whereof is a function of the initial position and of the size of the openings.
  • a further characteristic of the ring is its shape, which is characterized, in the peripheral region, by two circumferential facing edges, which define between themselves a recess which is also circumferential and is adapted to couple to the complementarily shaped margin of the accommodation hole in the supporting element connected to the fixed part of the pump.
  • the ring is furthermore characterized by protruding raised portions provided inside the ring assembly seat, said raised portions engaging with complementarily shaped notches provided on the margin of the supporting element.
  • Fig. 1 is a perspective view of the shimming ring
  • Fig. 2 is a perspective view, in partial cross section, of the supporting element
  • Fig. 3 is a cross section view, along a diametral plane, of a ring according to the invention
  • Fig. 4 is a longitudinal cross section view of a detail of a multistage pump illustrating the location of the sealing ring.
  • a hydraulic sealing ring according to the invention, generally indicated by the reference numeral 1, comprises a shimming element 2, in rubber having an adequate mix and hardness, its inner face 3 having a considerable thickness in the axial direction and being adapted to couple with the external surface 4, shaped complementarily thereto, of the inlet 5 of the centrifugal impeller 6.
  • the shimming element 2 has a pair of circumferential borders, respectively a low-pressure-side border 7 and a high-pressure-side border 8, which extend facing one another on a plane substantially parallel to the plane of arrangement of said element 2.
  • Said borders 7 and 8 define, comprising between them, a circumferential recess 9 for coupling with a corresponding supporting element connected to the fixed part of the pump 10.
  • protruding raised portions 12, adapted to fix the element 2 to the supporting element, are evenly distributed on the bottom 11 of the recess 9.
  • the element 2 is characterized in that openings 13 are provided distributed along the recess 9 and have a cross section which is for example circular or elongated, and, extending substantially radially, connect the bottom 11 of said recess to the inner face 3 whereto they lead.
  • said openings 13 can vary in number and in dimensions, and can furthermore be distributed at mutually equal distances or arranged, for example, in clusters.
  • recessed regions 14 are furthermore provided on the inner face 3 of the element 2, and, arranged advantageously on the opposite side with respect to the raised portions 12, allow the discharge of sand, silt or any other solid material which may infiltrate between the element 2 and the impeller 6.
  • a previously mentioned supporting element advantageously consists of the appropriately manufactured diffuser cover 15, according to what is illustrated in Fig. 2.
  • Said cover 15 has a substantially disc-like shape with a central hole 16 and is obtained by the rigid coupling of two appropriately shaped metallic half-shells, the one facing towards the higher-pressure region being indicated by 17 and the one facing towards the lower-pressure region being indicated by 18.
  • the two half-shells 17 and 18 provide, in the coupling of their inner flaps, respectively 19 and 20, a margin 21 shaped complementarily with respect to the circumferential recess 9 of the ring 2, whereon locator notches 22 are conveniently provided, within which accommodate the raised portions 12 provided on the bottom 11 of said recess.
  • the two half-shells 17 and 18 are also provided with external flaps, respectively 23 and 24, having a shorter extension, which define a circumferential raised portion 25 which, as illustrated in Fig. 4, by engaging against tubular spacer elements 26 allows an appropriate positioning of the cover 15 inside the pump body 10.
  • the materials employed may be any according to the requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Mechanical Sealing (AREA)
EP87111178A 1986-08-08 1987-08-01 Hydraulic sealing ring on the inlet of the impeller in single-stage and multistage pumps Expired - Lifetime EP0257358B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87111178T ATE65116T1 (de) 1986-08-08 1987-08-01 Hydraulischer dichtungsring fuer den laufradeinlass von ein- und mehrstufigen pumpen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3073386U 1986-08-08
IT8630733U IT209616Z2 (it) 1986-08-08 1986-08-08 Anello di tenuta idraulica sulla bocca della girante in pompe mono e pluristadio.

Publications (3)

Publication Number Publication Date
EP0257358A2 EP0257358A2 (en) 1988-03-02
EP0257358A3 EP0257358A3 (en) 1988-11-09
EP0257358B1 true EP0257358B1 (en) 1991-07-10

Family

ID=11231522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111178A Expired - Lifetime EP0257358B1 (en) 1986-08-08 1987-08-01 Hydraulic sealing ring on the inlet of the impeller in single-stage and multistage pumps

Country Status (4)

Country Link
EP (1) EP0257358B1 (it)
AT (1) ATE65116T1 (it)
DE (1) DE3771284D1 (it)
IT (1) IT209616Z2 (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4330098A1 (de) * 1993-09-06 1995-03-09 Klein Schanzlin & Becker Ag Als Blechformteil ausgebildete Leiteinrichtung
DE19607292A1 (de) * 1996-02-27 1997-08-28 Grundfos As Gehäuse mit Leitapparat für eine Pumpenstufe einer mehrstufigen Kreiselpumpe

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939156C2 (de) * 1989-11-27 1994-01-27 Grundfos International A S Bje Zusammengesetztes Laufrad für eine Kreiselpumpe
DE10260443A1 (de) * 2002-12-21 2004-07-01 Ksb Aktiengesellschaft Strömungsmaschinengehäuse
GB0412231D0 (en) * 2004-06-02 2004-07-07 Weir Pumps Ltd Mechanical assembly and deformable element therefor
EP2148096B1 (de) * 2008-07-25 2013-04-10 Grundfos Management A/S Kreiselpumpe
IT1398921B1 (it) 2010-03-25 2013-03-28 Caprari Spa Pompa centrifuga.
EP3181909B1 (en) 2015-12-14 2020-04-08 Wilo Se Compact sealing ring unit
EP3460253A1 (en) * 2017-09-26 2019-03-27 Xylem IP Management S.à.r.l. Pump with a wear ring

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1839514A (en) * 1929-01-23 1932-01-05 Pacific Pump Works Device for preventing short circuiting flow around impellers
US2644403A (en) * 1952-03-05 1953-07-07 Ingersoll Rand Co Device for preventing clogging in centrifugal pumps
SE396454C (sv) * 1974-04-30 1978-01-09 Asea Ab Hogtryckspress
DE3207327A1 (de) * 1982-03-01 1983-09-08 Heinz Konrad Prof. Dr.-Ing. 7050 Waiblingen Müller Wellendichtung
IT1180991B (it) * 1984-06-07 1987-09-23 Lowara Spa Dispositivo di tenuta interposto tra girante e corpo pompa

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4330098A1 (de) * 1993-09-06 1995-03-09 Klein Schanzlin & Becker Ag Als Blechformteil ausgebildete Leiteinrichtung
DE19607292A1 (de) * 1996-02-27 1997-08-28 Grundfos As Gehäuse mit Leitapparat für eine Pumpenstufe einer mehrstufigen Kreiselpumpe
DE19607292C2 (de) * 1996-02-27 2000-06-08 Grundfos A S Bjerringbro Gehäuse mit Leitapparat für eine Pumpenstufe einer mehrstufigen Kreiselpumpe

Also Published As

Publication number Publication date
DE3771284D1 (de) 1991-08-14
EP0257358A3 (en) 1988-11-09
IT8630733V0 (it) 1986-08-08
IT209616Z2 (it) 1988-10-24
ATE65116T1 (de) 1991-07-15
EP0257358A2 (en) 1988-03-02

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