SE502552C2 - sealing device - Google Patents

sealing device

Info

Publication number
SE502552C2
SE502552C2 SE9400881A SE9400881A SE502552C2 SE 502552 C2 SE502552 C2 SE 502552C2 SE 9400881 A SE9400881 A SE 9400881A SE 9400881 A SE9400881 A SE 9400881A SE 502552 C2 SE502552 C2 SE 502552C2
Authority
SE
Sweden
Prior art keywords
inlet
impeller
pump housing
pump
ring
Prior art date
Application number
SE9400881A
Other languages
Swedish (sv)
Other versions
SE9400881D0 (en
SE9400881L (en
Inventor
Ulf Arbeus
Original Assignee
Flygt Ab Itt
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 Flygt Ab Itt filed Critical Flygt Ab Itt
Priority to SE9400881A priority Critical patent/SE502552C2/en
Publication of SE9400881D0 publication Critical patent/SE9400881D0/en
Priority to EP19950850055 priority patent/EP0672832B1/en
Priority to DE1995602525 priority patent/DE69502525T2/en
Priority to JP5592495A priority patent/JPH08121384A/en
Priority to CA 2144692 priority patent/CA2144692C/en
Publication of SE9400881L publication Critical patent/SE9400881L/en
Publication of SE502552C2 publication Critical patent/SE502552C2/en

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

Abstract

The invention concerns a device for sealing off the slot between a pump impeller and a pump housing in a centrifugal pump. The inlet part (2) of the pump housing (1) is designed with a collar (2) which concentrically surrounds a corresponding opposite collar formed part (5) of the pump impeller inlet, thus linking any possible leakage flow in parallel with the main flow into the impeller and minimizing the disturbance in the main flow. In order to minimize the leakage flow an O-ring (7) is arranged in front of the opening to the slot (8) between the parts (2) and (5). <IMAGE>

Description

502 552 2 beror pà de dynamiska krafter som förorsakas av att 0-ringen är medroterande. 502 552 2 depends on the dynamic forces caused by the 0-ring co-rotating.

Ytterligare sätt att angripa problemet visas i EP-492603 samt US 3228342 och 3221661. Här utformas pumpinloppet sà att uppkommande läckflöden omlänkas i en riktning som skall minska störningen i in- flödet.Further ways of tackling the problem are shown in EP-492603 and US 3228342 and 3221661. Here the pump inlet is designed so that emerging leakage flows are redirected in a direction which is to reduce the disturbance in the inflow.

Enligt uppfinningen àstadkoms en tillförlitlig och slitstark anord- ning för att minimera läckflödet i pumpinloppet och samtidigt minska risken för virvelbildningar i inflödet med hjälp av den anordning som anges i efterföljande patentkrav. Anordningen beskrivs närmare nedan under hänvisning till bifogade figurer där figur 1 visar ett snitt genom en del av ett pumphus och pumphjul, medan fig 2 visar en för- storing av en central del.According to the invention, a reliable and durable device is provided for minimizing the leakage flow in the pump inlet and at the same time reducing the risk of vortex formations in the inflow by means of the device specified in the following claims. The device is described in more detail below with reference to the accompanying figures, where figure 1 shows a section through a part of a pump housing and impeller, while figure 2 shows an enlargement of a central part.

I figurerna betecknar 1 ett pumphjul med en inloppsdel eller hals 2. 3 betecknar ett pumphus med en botten 4 och en kragformig inloppsdel 5. 6 betecknar en slitring. 7 en O-ring och 8 en spalt.In the figures, 1 denotes an impeller with an inlet part or neck 2. 3 denotes a pump housing with a bottom 4 and a collar-shaped inlet part 5. 6 denotes a wear ring. 7 an O-ring and 8 a gap.

Den pumpade vätskan sugs in i axiell riktning genom pumphjulets cen- trala öppning och lämnar hjulet vid dess periferi. För att pumphjulet skall kunna rotera fritt, krävs en viss spalt mellan dess inloppsdel och pumphusets inloppsdel. Samtidigt föreligger en strävan att göra spalten sà smal som möjligt för att minimera àterströmningen fràn pumphusets inre förorsakad av tryckskillnader mellan detta och omgiv- ningen.The pumped liquid is sucked in the axial direction through the central opening of the impeller and leaves the wheel at its periphery. In order for the impeller to be able to rotate freely, a certain gap is required between its inlet part and the inlet part of the pump housing. At the same time, there is an effort to make the gap as narrow as possible to minimize the backflow from the interior of the pump housing caused by pressure differences between it and the environment.

Enligt uppfinningen utformas pumphjulets 1 inloppsdel 2 med en kon- centrisk krage som med spel omsluter en likaledes kragformad del 5 pà pumphusets 3 inlopp. Delen 5 är därvid motriktad kragen 2 och sträck- er sig sålunda in ett stycke i denna.According to the invention, the inlet part 2 of the impeller 1 is formed with a concentric collar which playfully encloses a similarly collar-shaped part 5 on the inlet of the impeller housing 3. The part 5 is then opposite the collar 2 and thus extends a piece therein.

Den läckström som med nödvändighet uppkommer, omlänkas därigenom sà att den kommer in i det närmaste parallellt med huvudströmmen in i pumphjulet, varigenom den störning som uppkommer i huvudströmmen blir minimal. 502 552 3 För att ytterligare minska läckströmmen och samtidigt minska risken för igensättning vid pumpning av förorenade vätskor, anordnas en sta- tionär O-ring 7 som täcker ingången till spalten 8 mellan delarna 2 och 5. O-ringen fästs därvid pà den inre, icke roterande delen 5.The leakage current which necessarily arises is thereby redirected so that it enters approximately parallel to the main current into the impeller, whereby the disturbance which arises in the main current becomes minimal. 502 552 3 In order to further reduce the leakage current and at the same time reduce the risk of clogging when pumping contaminated liquids, a stationary O-ring 7 is arranged which covers the entrance to the gap 8 between the parts 2 and 5. The O-ring is attached to the inner, non-rotating part 5.

Det är viktigt att de två delarna 2 och 5 överlappar varandra en viss sträcka för att ett gott resultat skall erhållas.It is important that the two parts 2 and 5 overlap each other a certain distance in order to obtain a good result.

För att minska risken för slitage av inloppet 2 inom området för spalten 8, förses hjulet med en ring 6 av speciellt slitstarkt mate- rial mot vilken O-ringen 7 glider.To reduce the risk of wear of the inlet 2 within the area of the gap 8, the wheel is provided with a ring 6 of particularly durable material against which the O-ring 7 slides.

Claims (1)

1. 502 552 PATENTKRAV 1 Anordning för att minska àterströmningen genom spalten mel- lan ett pumphusinlopp och en i detta roterande inloppsdel till ett pumphjul, k ä n n e t e c k n a d därav, att pumphjulets (l) inloppsdel (2) är utformad med en axiellt riktad krage som koaxiellt omsluter en likaledes kragformad motriktad del (5) av pumphusinloppet samt att den axiella spalten (8) mellan det roterade pumphjulsinloppet (2) och den icke roterande pumphusinloppsdelen (5) avtätas medelst en icke roterande O-ring (7) belägen vid spaltens fràn pumphusets inre vända ände.A device for reducing the backflow through the gap between a pump housing inlet and a rotating inlet part thereof in a pump wheel, characterized in that the inlet part (2) of the impeller (1) is formed with an axially directed collar which coaxially encloses a similarly collar-shaped opposite part (5) of the pump housing inlet and that the axial gap (8) between the rotated impeller inlet (2) and the non-rotating pump housing inlet part (5) is sealed by means of a non-rotating O-ring (7) located at the gap from the inner facing end of the pump housing.
SE9400881A 1994-03-16 1994-03-16 sealing device SE502552C2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE9400881A SE502552C2 (en) 1994-03-16 1994-03-16 sealing device
EP19950850055 EP0672832B1 (en) 1994-03-16 1995-03-13 Sealing device for pump impeller
DE1995602525 DE69502525T2 (en) 1994-03-16 1995-03-13 Sealing device for pump impeller
JP5592495A JPH08121384A (en) 1994-03-16 1995-03-15 Reducing device for back flow
CA 2144692 CA2144692C (en) 1994-03-16 1995-03-15 Sealing device for pump impeller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9400881A SE502552C2 (en) 1994-03-16 1994-03-16 sealing device

Publications (3)

Publication Number Publication Date
SE9400881D0 SE9400881D0 (en) 1994-03-16
SE9400881L SE9400881L (en) 1995-09-17
SE502552C2 true SE502552C2 (en) 1995-11-13

Family

ID=20393295

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9400881A SE502552C2 (en) 1994-03-16 1994-03-16 sealing device

Country Status (5)

Country Link
EP (1) EP0672832B1 (en)
JP (1) JPH08121384A (en)
CA (1) CA2144692C (en)
DE (1) DE69502525T2 (en)
SE (1) SE502552C2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613486C2 (en) * 1996-04-04 1998-12-24 Grundfos As Formation of seals for centrifugal pumps to reduce the gap leakage current in the suction mouth area of the pump impeller
DE102006024997A1 (en) * 2006-05-30 2007-12-06 Wilo Ag rotary pump
JP2008050958A (en) * 2006-08-23 2008-03-06 Iwaki Co Ltd Self-priming pump
FR2911166B1 (en) * 2007-01-09 2012-08-03 Siebec Soc PUMP WITH MAGNETIC DRIVE AND SLIDING SEAL
JP5046767B2 (en) * 2007-07-19 2012-10-10 日立アプライアンス株式会社 Electric blower and vacuum cleaner provided with the same
CN104235070A (en) * 2013-06-13 2014-12-24 德昌电机(深圳)有限公司 Pump case and pump with same
CN107917100B (en) * 2017-10-26 2019-03-26 珠海格力电器股份有限公司 The connection structure and air-conditioning of baffle liner and fan impeller front disc

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221661A (en) 1961-12-18 1965-12-07 Electronic Specialty Co Low-suction head pumps
US3228343A (en) 1964-05-25 1966-01-11 U S Pumps Inc Self-priming pump
US3741679A (en) * 1971-09-17 1973-06-26 Blue Co John Centrifugal pump
IT1180991B (en) * 1984-06-07 1987-09-23 Lowara Spa SEALING DEVICE INTERPOSED BETWEEN IMPELLER AND PUMP BODY
SU1370318A1 (en) * 1986-06-06 1988-01-30 Всесоюзный Научно-Исследовательский Институт Горной Механики Им.М.М.Федорова Packing of pump impeller
US5295786A (en) 1990-12-27 1994-03-22 Ebara Corporation Liner ring for a pump
US5129795A (en) * 1991-05-31 1992-07-14 Powerdyne Corporation Motor driven pump

Also Published As

Publication number Publication date
SE9400881D0 (en) 1994-03-16
EP0672832B1 (en) 1998-05-20
CA2144692C (en) 2000-03-07
SE9400881L (en) 1995-09-17
DE69502525D1 (en) 1998-06-25
JPH08121384A (en) 1996-05-14
EP0672832A1 (en) 1995-09-20
DE69502525T2 (en) 1998-09-17
CA2144692A1 (en) 1995-09-17

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