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EP0167837B2 - Dispositif d'étanchéité pour interposition entre un boîtier de pompe et une roue à aube - Google Patents
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EP0167837B2 - Dispositif d'étanchéité pour interposition entre un boîtier de pompe et une roue à aube - Google Patents

Dispositif d'étanchéité pour interposition entre un boîtier de pompe et une roue à aube Download PDF

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Publication number
EP0167837B2
EP0167837B2 EP85107012A EP85107012A EP0167837B2 EP 0167837 B2 EP0167837 B2 EP 0167837B2 EP 85107012 A EP85107012 A EP 85107012A EP 85107012 A EP85107012 A EP 85107012A EP 0167837 B2 EP0167837 B2 EP 0167837B2
Authority
EP
European Patent Office
Prior art keywords
impeller
seal element
ring
seal
pump
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
EP85107012A
Other languages
German (de)
English (en)
Other versions
EP0167837B1 (fr
EP0167837A1 (fr
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11251672&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0167837(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Lowara SRL filed Critical Lowara SRL
Priority to AT85107012T priority Critical patent/ATE41483T1/de
Publication of EP0167837A1 publication Critical patent/EP0167837A1/fr
Publication of EP0167837B1 publication Critical patent/EP0167837B1/fr
Application granted granted Critical
Publication of EP0167837B2 publication Critical patent/EP0167837B2/fr
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

Definitions

  • This invention relates to a seal device, particularly of a type for interposition between a pump body and pump impeller.
  • centrifugal pumps utilise a seal ring placed between the impeller port and pump body which restricts its radial play.
  • a further important object is to provide a device which affords maximisation of the hydraulic performance while minimising the recycle flow.
  • a main object is also that of providing a device which can simultaneously achieve the two preceding objects.
  • Another object is to provide a device which allows the utilisation of ring seals of suitable materials also for specific liquids and temperatures.
  • seal device for interposition between a pump impeller and a pump body of single or multistage type, as defined in appended claim 1.
  • the device of this invention may be used also in multistage pumps in connection with all or some of the impeller stages.
  • the device 1 comprises two rings 2 and 3 positionable between the pump body 4 and impeller 5 of any centrifugal pump.
  • the ring 2 having an essentially L-like cross-sectional shape is spot welded and rests with the longer flange 6 on the pump body 4, while the other flange 7, perpendicular to the axis of the impeller 5, contacts the zone 8 located downstream from the inlet end of the intake or port 9.
  • zone 8 there is present the fluid centrifuged by the impeller 5, which is subjected to a higher pressure than that prevailing in the suction zone 10.
  • the zone 8 is enclosed by the body 4 of the pump within the cavity or compartment thereof where the impeller 5 rotates between the inner walls of the pump body and the impeller.
  • the fluid is substantially stagnant but it takes up the delivery pressure of the pump, the liquid flowing according to the arrow A through the hollow interior of the impeller owing to the centrifugal action thereon.
  • the flange 7 has a plurality of openings 11 formed proximately to the point of connection with the flange 6.
  • the second ring 3 has an essentially S-like cross-sectional shape, with the bottom lug or flange 12 being slightly longer than the upper lug or flange 13.
  • the upper lug 13 abuts and is spot welded on the flange 6 of the ring 2, while the bottom lug 12 is disposed parallel to that same flange and rests with its free end on the pump body 4.
  • the rings 2 and 3 define a groove or seat 14, whose base is defined by the upper lug 13 of the second ring 3 for a sealing element 15 comprising, for example, a circular cross-section elastomer ring.
  • the seat 14 has a greater depth than the external diameter of the element 15, or corresponding external dimension of a sealing element having other than a circular cross-section, so that a chamber 16 is defined between the base of said seat 14 and a portion of said sealing element.
  • the device 1 operates as follows: on operating the pump, the pressurized liquid present in the zone 8 will flow, through the openings 11, into the chamber 16 of the seat 14.
  • That liquid pressure urges the sealing element or elastomer ring 15 against the external circumferential face of the intake 9 of the impeller 5 because the fluid working in the zone 17 has a much lower pressure than that in the zone 8.
  • the liquid present in this latter zone 8 tends to leak out also through the space 18, and below the element 15, thus forming, in a condition of equilibrium, a ring or film of liquid, for lubricating the sliding motion between the sealing element 15 and the port 9 of the impeller 5, its thickness being such as to ensure a minimal recycle of the liquid, and hence, a high volumetric efficiency, whilst avoiding any scraping action occurring between the sealing element and the impeller.
  • the sealing element is held stationary within the seat 14.
  • the pressure in the zone 14 is somewhat greater than the pressure in the zone 17 owing to the pressure drop caused by the leaks through the space 18 and the communication with the suction side of the pump. Therefore the ring 15 is urged radially inwards and allows compensation.
  • the ring or sealing element 15 is also self-compensated, by virtue of the fact that, the higher the pressure in the pump becomes, consequently, the greater become the forces applied by the fluid, to the sealing element, thereby compensating the play existing between its surface and the outer circumferential surface of the port or forward portion 9 of the impeller 5.
  • the device 101 could also include two rings 102 and 103, but with the latter being formed with a guide 119 projecting into a correspondingly shaped seat 114, provided on the element 115.
  • a semirigid ring of plastics material also an elastic metallic split ring may be used.
  • any materials may be used contingent on requirements, such as the type and temperature of the liquid being pumped.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Seal Device For Vehicle (AREA)

Claims (6)

  1. Dispositif d'étanchéité (1; 101) destiné à être interposé entre un rotor de pompe (5; 105) et un corps de pompe (4; 104), de type à étage unique ou à étages multiples, comprenant au moins un élément d'étanchéité (15; 115) entourant une portion (9; 109) dudit rotor (5; 105), ledit élément d'étanchéité (15; 115) étant reçu à l'intérieur de moyens de logement (14; 114) prévus sur ledit corps de pompe (4; 104) et autorisant un mouvement radial dudit élément d'étanchéité (15; 115) à l'intérieur, des premiers moyens (11, 111) étant prévus pour permettre à une force de pression d'agir sur ledit élément d'étanchéité (15; 115) pour pousser ledit élément d'étanchéité radialement contre ledit rotor (5; 105) et des seconds moyens (18; 118) pour permettre à une force de pression supplémentaire réduite d'agir sur ledit élément d'étanchéité (15; 115) de manière à pousser et éloigner ledit élément d'étanchéité radialement à partir dudit rotor (5; 105), de façon à admettre un mince film lubrifiant de fluide entre ledit moyen d'étanchéité (15; 115) et ledit rotor (5; 105), dans lequel lesdits moyens de logement (14; 114) ont une profondeur radiale supérieure à celle dudit élément d'étanchéité (15; 115) et une chambre 16 est formée par une portion dudit élément d'étanchéité (15) et une portion desdits moyens de logement (14), ladite chambre (16) étant séparée desdits seconds moyens, lesdits premiers moyens d'application d'une force de pression comprennent plusieurs ouvertures (11; 111) formées dans lesdits moyens de logement (14; 114) à proximité dudit corps de pompe (4; 104) de façon à faire communiquer la pression de refoulement du fluide qui est centrifugé par le rotor (5; 105) dans ladite chambre (16) avec une portion dudit élément d'étanchéité (15; 115) qui fait face audit corps de pompe, et lesdits seconds moyens pour appliquer une force de pression supplémentaire réduite comportent un espace (18; 118) formé dans lesdits moyens de logement (14; 114) à proximité dudit rotor (5; 105) en vue de faire communiquer la pression de refoulement du fluide centrifugé avec une portion dudit élément d'étanchéité (15; 115) qui fait face audit rotor (5; 105), le mince film de fluide étant causé par une fuite du fluide centrifugé par ledit rotor.
  2. Dispositif d'étanchéité selon la revendication 1, caractérisé en ce que lesdits moyens de logement comprennent au moins un siège (14; 114) formé par un premier et un second anneaux (2, 3; 102, 103), ledit premier anneau (2; 102) définissant une section transversale sensiblement en forme de L comprenant un flasque plus long (6; 106) qui est solidaire du corps de pompe (4; 104) et un flasque plus court (7; 107) disposé en aval de la portion (9; 109) dudit rotor (5; 105) qui est face audit élément d'étanchéité (15; 115), et ledit second anneau (3; 103) définissant une section transversale sensiblement en forme de S et comprenant une patte (13; 113) solidarisée audit flasque plus long (6; 106) dudit premier anneau (2; 102) pour définir le fond dudit siège (14; 114).
  3. Dispositif d'étanchéité selon les revendications 1 à 2, caractérisé en ce que ledit élément d'étanchéité (15) comprend un anneau en élastomère.
  4. Dispositif d'étanchéité selon les revendications 1 à 3, caractérisé en ce que ledit élément d'étanchéité (115) comprend un anneau d'usure rigide présentant un siège latéral (114) adapté à un mouvement de coulissement radial sur un guide (119) conformé de façon correspondante et formé sur ledit second anneau (103).
  5. Pompe comprenant un dispositif d'étanchéité selon les revendications 1 à 4.
  6. Pompe à étages multiples comprenant dans un au moins l'un de ses étages un dispositif d'étanchéité selon les revendications 1 à 4.
EP85107012A 1984-06-07 1985-06-05 Dispositif d'étanchéité pour interposition entre un boîtier de pompe et une roue à aube Expired - Lifetime EP0167837B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85107012T ATE41483T1 (de) 1984-06-07 1985-06-05 Dichtungsanlage zwischen einem pumpengehaeuse und einem pumpenrad.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT41591/84A IT1180991B (it) 1984-06-07 1984-06-07 Dispositivo di tenuta interposto tra girante e corpo pompa
IT4159184 1984-06-07

Publications (3)

Publication Number Publication Date
EP0167837A1 EP0167837A1 (fr) 1986-01-15
EP0167837B1 EP0167837B1 (fr) 1989-03-15
EP0167837B2 true EP0167837B2 (fr) 1996-06-05

Family

ID=11251672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107012A Expired - Lifetime EP0167837B2 (fr) 1984-06-07 1985-06-05 Dispositif d'étanchéité pour interposition entre un boîtier de pompe et une roue à aube

Country Status (4)

Country Link
EP (1) EP0167837B2 (fr)
AT (1) ATE41483T1 (fr)
DE (1) DE3568833D1 (fr)
IT (1) IT1180991B (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT209616Z2 (it) * 1986-08-08 1988-10-24 Lowara Spa Anello di tenuta idraulica sulla bocca della girante in pompe mono e pluristadio.
US5295786A (en) * 1990-12-27 1994-03-22 Ebara Corporation Liner ring for a pump
DE4302492A1 (de) * 1993-01-29 1994-08-04 Klein Schanzlin & Becker Ag Spaltringdichtung
SE502552C2 (sv) * 1994-03-16 1995-11-13 Flygt Ab Itt Tätningsanordning
US5577886A (en) * 1995-02-15 1996-11-26 Itt Flygt Ab Sealing device for pump impeller
AU5411898A (en) * 1997-09-30 1999-04-23 Ebara Corporation Centrifugal pump and sealing mechanism thereof
US6439843B1 (en) * 2000-11-16 2002-08-27 Ametek, Inc. Motor/fan assembly having a radial diffuser bypass
JP4532142B2 (ja) * 2003-12-22 2010-08-25 株式会社荏原製作所 流体機械のシール機構又は遠心ポンプ
CN102619778B (zh) * 2012-04-24 2014-07-30 浙江格凌实业有限公司 一种旋涡式气泵的密封圈张紧机构
FR3058758B1 (fr) * 2016-11-14 2020-07-17 Safran Aircraft Engines Turbomachine, telle par exemple qu'un turboreacteur ou un turbopropulseur d'avion
LU500237B1 (de) * 2021-06-02 2022-12-02 Wilo Se Kreiselpumpe mit verbesserter Saughalsdichtung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1369508A (en) * 1920-01-03 1921-02-22 Edwin M R Weiner Centrifugal pump
US1783427A (en) * 1924-08-11 1930-12-02 Irving C Jennings Sealing device for centrifugal pumps
US2162486A (en) * 1937-06-21 1939-06-13 Letourneau Inc Sealing means for centrifugal pump impellers
GB748827A (en) * 1953-04-24 1956-05-09 Masch Ebau Ag Balcke Improvements relating to seals between the rotary and stationary parts of rotary machines
US3578874A (en) * 1968-09-26 1971-05-18 Dominion Eng Works Ltd Removable runner seal
US3741679A (en) * 1971-09-17 1973-06-26 Blue Co John Centrifugal pump
US3779667A (en) * 1972-02-24 1973-12-18 Baker Hydro Inc Semi-seal device

Also Published As

Publication number Publication date
IT8441591A0 (it) 1984-06-07
ATE41483T1 (de) 1989-04-15
EP0167837B1 (fr) 1989-03-15
IT1180991B (it) 1987-09-23
EP0167837A1 (fr) 1986-01-15
DE3568833D1 (en) 1989-04-20
IT8441591A1 (it) 1985-12-07

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