EP0257358A3 - 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

Info

Publication number
EP0257358A3
EP0257358A3 EP87111178A EP87111178A EP0257358A3 EP 0257358 A3 EP0257358 A3 EP 0257358A3 EP 87111178 A EP87111178 A EP 87111178A EP 87111178 A EP87111178 A EP 87111178A EP 0257358 A3 EP0257358 A3 EP 0257358A3
Authority
EP
European Patent Office
Prior art keywords
impeller
inlet
ring
stage
sealing ring
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
Application number
EP87111178A
Other versions
EP0257358B1 (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/en
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

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
    • F04D29/08—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

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)

Abstract

The hydraulic sealing ring (1) on the inlet (5) of the impeller (6), particularly for single-stage and multistage pumps is made in a rubber-like material the inner face (3) whereof couples to the outer surface (4) of the inlet (5) of an impeller (6). The ring (1) has substantially radial openings which connect a shimming face to the outer one to allow a slight injection of liquid bled from the higher-pressure chamber in output from the impeller blades in the shimming region and to allow the creation and the maintainance of an extremely thin layer of liquid adapted to ensure a lubrication of the scraping surfaces with a reduced leakage towards the lower-pressure region at the input of the impeller (6) and to counterbalance the radial force which tends to press the ring around the inlet (5) of the impeller (6), said force being generated by the pressure of the liquid acting on the outer face (4) of said ring.
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 (en) 1986-08-08 1987-08-01 HYDRAULIC SEAL FOR IMPELLER INLET OF SINGLE AND MULTISTAGE PUMPS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8630733U IT209616Z2 (en) 1986-08-08 1986-08-08 HYDRAULIC SEAL RING ON THE MOUTH OF THE IMPELLER IN SINGLE AND MULTI-STAGE PUMPS.
IT3073386U 1986-08-08

Publications (3)

Publication Number Publication Date
EP0257358A2 EP0257358A2 (en) 1988-03-02
EP0257358A3 true EP0257358A3 (en) 1988-11-09
EP0257358B1 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 (en)
AT (1) ATE65116T1 (en)
DE (1) DE3771284D1 (en)
IT (1) IT209616Z2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939156C2 (en) * 1989-11-27 1994-01-27 Grundfos International A S Bje Compound impeller for a centrifugal pump
DE4330098A1 (en) * 1993-09-06 1995-03-09 Klein Schanzlin & Becker Ag Guide device designed as a molded sheet metal part
DE19607292C2 (en) * 1996-02-27 2000-06-08 Grundfos A S Bjerringbro Housing with guide device for one pump stage of a multi-stage centrifugal pump
DE10260443A1 (en) * 2002-12-21 2004-07-01 Ksb Aktiengesellschaft Housing for multi-stage rotary pump is fabricated from sheet metal and has impeller wheel separated from the housing walls by a seal
GB0412231D0 (en) * 2004-06-02 2004-07-07 Weir Pumps Ltd Mechanical assembly and deformable element therefor
EP2148096B1 (en) * 2008-07-25 2013-04-10 Grundfos Management A/S Centrifugal pump
IT1398921B1 (en) 2010-03-25 2013-03-28 Caprari Spa CENTRIFUGAL PUMP.
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

Citations (6)

* 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
DE1653713B2 (en) * 1966-08-09 1972-11-23 Grundfos A/S. Bjerringbro (Dänemark) Centrifugal pump
FR2269414A1 (en) * 1974-04-30 1975-11-28 Asea Ab
DE3207327A1 (en) * 1982-03-01 1983-09-08 Heinz Konrad Prof. Dr.-Ing. 7050 Waiblingen Müller Shaft seal
EP0167837A1 (en) * 1984-06-07 1986-01-15 LOWARA S.p.A. Seal device for interposition between a pump body and pump impeller

Patent Citations (6)

* 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
DE1653713B2 (en) * 1966-08-09 1972-11-23 Grundfos A/S. Bjerringbro (Dänemark) Centrifugal pump
FR2269414A1 (en) * 1974-04-30 1975-11-28 Asea Ab
DE3207327A1 (en) * 1982-03-01 1983-09-08 Heinz Konrad Prof. Dr.-Ing. 7050 Waiblingen Müller Shaft seal
EP0167837A1 (en) * 1984-06-07 1986-01-15 LOWARA S.p.A. Seal device for interposition between a pump body and pump impeller

Also Published As

Publication number Publication date
EP0257358B1 (en) 1991-07-10
IT8630733V0 (en) 1986-08-08
DE3771284D1 (en) 1991-08-14
ATE65116T1 (en) 1991-07-15
EP0257358A2 (en) 1988-03-02
IT209616Z2 (en) 1988-10-24

Similar Documents

Publication Publication Date Title
CA2101085A1 (en) Blood pump
MY101751A (en) Improved impeller
ES8504366A1 (en) Shaft seals.
SE8704144L (en) GUEST SEALING DEVICE FOR AN AXLE
DE3371929D1 (en) Fuel injection pump
EP0257358A3 (en) Hydraulic sealing ring on the inlet of the impeller in single-stage and multistage pumps
JPS6487975A (en) Sealing device for pump
GB955438A (en) Centrifugal pump
GB1251686A (en)
SE8303566L (en) CENTRIFUGAL PUMPS SEAL SEAL AND PROCEDURE FOR ITS EXECUTION
ES8201271A1 (en) Radial piston pump
GR3000651T3 (en) Process and installation to cause circulation of fluids by pumping
ES8406654A1 (en) Primary pump for a pressurized water reactor, having a seal arrangement for its shaft.
EP0380990A3 (en) Reversible turbine pump
GB1391166A (en) Axial flow turbine
ES2014088A6 (en) Turbine shaft axial load protection system
CA1157062A (en) Coal slurry pump seal assembly
WO1995027844A3 (en) Twin rotor expansible/contractible chamber assembly
EP0391488A3 (en) Vented static seal assembly
FR2296124A1 (en) Flexible bearing support for pump shaft - reduces leakage by allowing bearing to work with minimum clearance
SU1097826A1 (en) Multistage peripheral pump
JPS5712164A (en) Air supply device to rotor
JPS57191488A (en) Compressor
GB1526936A (en) Sealing means
GB784928A (en) Rotary pump with sealed impeller hub

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

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB LI LU NL SE

17P Request for examination filed

Effective date: 19890317

17Q First examination report despatched

Effective date: 19890911

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19910710

Ref country code: NL

Effective date: 19910710

Ref country code: LI

Effective date: 19910710

Ref country code: CH

Effective date: 19910710

Ref country code: BE

Effective date: 19910710

Ref country code: AT

Effective date: 19910710

REF Corresponds to:

Ref document number: 65116

Country of ref document: AT

Date of ref document: 19910715

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3771284

Country of ref document: DE

Date of ref document: 19910814

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19910831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19911010

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

GBPC Gb: european patent ceased through non-payment of renewal fee
26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Ref country code: FR

Ref legal event code: CJ

Ref country code: FR

Ref legal event code: CD

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20060731

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20060929

Year of fee payment: 20