EP0672832B1 - Sealing device for pump impeller - Google Patents

Sealing device for pump impeller Download PDF

Info

Publication number
EP0672832B1
EP0672832B1 EP19950850055 EP95850055A EP0672832B1 EP 0672832 B1 EP0672832 B1 EP 0672832B1 EP 19950850055 EP19950850055 EP 19950850055 EP 95850055 A EP95850055 A EP 95850055A EP 0672832 B1 EP0672832 B1 EP 0672832B1
Authority
EP
European Patent Office
Prior art keywords
impeller
inlet
pump
rotating
slot
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
EP19950850055
Other languages
German (de)
French (fr)
Other versions
EP0672832A1 (en
Inventor
Ulf Arbeus
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.)
Xylem Water Solutions AB
Original Assignee
ITT Flygt AB
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 ITT Flygt AB filed Critical ITT Flygt AB
Publication of EP0672832A1 publication Critical patent/EP0672832A1/en
Application granted granted Critical
Publication of EP0672832B1 publication Critical patent/EP0672832B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

  • the invention concerns a pump including a seal device for sealing between a pump impeller and an adjacent non-rotating part.
  • Another way to solve the problem is to arrange a co-rotating O-ring on the impeller inlet part which is influenced by the pressure to glide against the non-rotating surface, the latter then being made of a different material.
  • a relatively good seal is obtained in this way, but one disadvantage is that the wear may be extensive causing short service intervals. It has also been noted that the O-ring has a tendency to loose its contact. If this occurs, the self-balancing ends and the seal does not function. This depends on the fact that dynamic forces caused by the O-ring are co-rotating.
  • a secure and wear resistant device is obtained which minimizes the leakage flow within the pump inlet and which simultaneously decreases the risk for turbulence within the in flow.
  • the device is described more closely below with reference to the enclosed drawings where Fig 1 shows a cut through a part of a pump housing and impeller, while Fig 2 shows an enlarged view of a central part.
  • FIG. 1 stands for a pump impeller having an inlet part 2.
  • 3 stands for a pump housing with a bottom 4 and a collar formed inlet part 5.
  • 6 stands for a wear ring, 7 an O-ring and 8 a slot.
  • the pumped liquid is sucked in an axial direction into the centrally located opening of the impeller and leaves the impeller at its circumference.
  • a slot having a certain width must be present between the impeller and the inlet part of the pump housing.
  • the inlet part 2 of the impeller I is provided with a concentric collar which surrounds a similarly collar formed part 5 at the inlet of the pump housing 3 with a play.
  • the part 5 is then directed opposite the collar 2 and extends somewhat into this.
  • a stationary 0-ring 7 is arranged to cover the entrance to the slot 8 between the parts 2 and 5. The 0-ring is then attached to the inner non-rotating part 5.
  • the impeller is provided with a ring 6 of a wear resistant material on which the O-ring 7 glides.

Description

The invention concerns a pump including a seal device for sealing between a pump impeller and an adjacent non-rotating part.
In pumps with rotating impellers such as centrifugal pumps the pumped medium is sucked into the centre of the impeller and leaves at the circumference. It is then very important that the inlet part of the impeller is well fitted within the surrounding pump housing in order to prevent pumped medium from flowing back to the inlet. Such a back-flow which is caused by the higher pressure within the pump housing, means losses and creation of turbulence in the inlet. In addition pollution may collect between pump impeller and pump housing inlet.
In order to obtain the necessary sealing between the impeller and non-rotating parts it is common practice to arrange a wear part, for instance made of rubber, on the non-rotating part and let the impeller glide against that part during rotation. In this way an effective seal is obtained as long as the wear part is intact. When pumping liquids containing pollution such as sand, cloth plastic stripes etc, there is a risk that the slot between seal ring and pump impeller becomes clogged which may cause expensive service work. As the pollution restrains the rotation of the impeller the energy consumption increases.
One way to solve the problem is to arrange a mechanical face seal between the impeller and the housing. By designing the sealing so that the seal slot becomes axially directed quite good sealing is obtained. A disadvantage is that this solution is comparatively expensive and in addition considerable losses may occur.
Another way to solve the problem is to arrange a co-rotating O-ring on the impeller inlet part which is influenced by the pressure to glide against the non-rotating surface, the latter then being made of a different material. A relatively good seal is obtained in this way, but one disadvantage is that the wear may be extensive causing short service intervals. It has also been noted that the O-ring has a tendency to loose its contact. If this occurs, the self-balancing ends and the seal does not function. This depends on the fact that dynamic forces caused by the O-ring are co-rotating.
Still another way to solve the problem is shown in EP-A-0 492 603 and US-A-322 1661. Here, the pump inlet is so designed that entering leakage flows are linked in a direction that shall decrease the disturbance of the main in-flow.
According to the invention a secure and wear resistant device is obtained which minimizes the leakage flow within the pump inlet and which simultaneously decreases the risk for turbulence within the in flow. The device is described more closely below with reference to the enclosed drawings where Fig 1 shows a cut through a part of a pump housing and impeller, while Fig 2 shows an enlarged view of a central part.
In the drawings 1 stands for a pump impeller having an inlet part 2. 3 stands for a pump housing with a bottom 4 and a collar formed inlet part 5. 6 stands for a wear ring, 7 an O-ring and 8 a slot.
The pumped liquid is sucked in an axial direction into the centrally located opening of the impeller and leaves the impeller at its circumference. To make it possible for the impeller to rotate freely, a slot having a certain width must be present between the impeller and the inlet part of the pump housing. At the same time there is a wish to make the slot as narrow as possible in order to minimize the back flow from the inner of the pump housing caused by the higher pressure in the latter.
According to the invention the inlet part 2 of the impeller I is provided with a concentric collar which surrounds a similarly collar formed part 5 at the inlet of the pump housing 3 with a play. The part 5 is then directed opposite the collar 2 and extends somewhat into this.
The leakage flow that necessarily occurs is then so linked that it enters the main flow into the impeller almost in parallel, which means that only a minimal disturbance is caused.
In order to further diminish the leakage flow and simultaneously decrease the risk for clogging when pumping polluted liquids, a stationary 0-ring 7 is arranged to cover the entrance to the slot 8 between the parts 2 and 5. The 0-ring is then attached to the inner non-rotating part 5.
It is important that the two parts 2 and 5 extend beyond each other a certain distance to secure a good result.
In order to decrease the wear of the inlet 2 within the area of the slot 8, the impeller is provided with a ring 6 of a wear resistant material on which the O-ring 7 glides.

Claims (1)

  1. A pump including a device to decrease back flow through the slot between a pump housing inlet (5) and an impeller (1) where the inlet (2) of the impeller (1) is designed with an axially directed slot between the rotating pump impeller inlet and the non-rotating pump housing inlet (5), characterized in that the impeller (1) is designed with an axially directed first collar (2) which coaxially surrounds a similarly designed second collar (5) formed opposing the first collar (2) and forming a part of the pump housing (3) and that the axially directed slot (8) between the rotating pump impeller inlet (2) and the non-rotating pump housing inlet (5) leads into the pump impeller (1) and is sealed off by a non-rotating O-ring arranged at one end of said slot, this end being the one facing away from the pump impeller.
EP19950850055 1994-03-16 1995-03-13 Sealing device for pump impeller Expired - Lifetime EP0672832B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9400881 1994-03-16
SE9400881A SE502552C2 (en) 1994-03-16 1994-03-16 sealing device

Publications (2)

Publication Number Publication Date
EP0672832A1 EP0672832A1 (en) 1995-09-20
EP0672832B1 true EP0672832B1 (en) 1998-05-20

Family

ID=20393295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950850055 Expired - Lifetime EP0672832B1 (en) 1994-03-16 1995-03-13 Sealing device for pump impeller

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
JPH08121384A (en) 1996-05-14
DE69502525D1 (en) 1998-06-25
SE9400881D0 (en) 1994-03-16
CA2144692A1 (en) 1995-09-17
EP0672832A1 (en) 1995-09-20
CA2144692C (en) 2000-03-07
SE502552C2 (en) 1995-11-13
SE9400881L (en) 1995-09-17
DE69502525T2 (en) 1998-09-17

Similar Documents

Publication Publication Date Title
WO2000009886A3 (en) Fluid pump
CA2203139C (en) Seal cavity throat bushing
US4613281A (en) Hydrodynamic seal
US3664760A (en) Centrifugal pump
EP0672832B1 (en) Sealing device for pump impeller
US20040253120A1 (en) Pump for the transporting of fluids and of mixtures of fluids
US3542496A (en) Dishwasher pump
US5577886A (en) Sealing device for pump impeller
US4708584A (en) Shrouded inducer pump
KR100225027B1 (en) Centrifugal slurry pump
KR940021938A (en) West nose pump
US5372730A (en) Filtering system for pump shaft seals
CA2007598C (en) Reversible turbine pump
US3771926A (en) Leakage preventing arrangement for pressurized fluid system such as pumps and the like
KR920703968A (en) Centrifugal Pump Lubricant Filtration System
US5513856A (en) Seal housing with helical element
US6464450B1 (en) Fuel pump
US5634769A (en) Guide apparatus for centrifugal pumps
KR20090127352A (en) Air diffuser system for industrial pumps
EP0512190B1 (en) Clog resistant pump
US5221182A (en) Vane apparatus for clog resistant pump
AU593534B2 (en) A seal arrangement for a pump
KR100469683B1 (en) A chemical process pump
JP2829359B2 (en) Vertical shaft pump shaft sealing device
KR200229322Y1 (en) Centrifugal pump

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: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19951101

17Q First examination report despatched

Effective date: 19961120

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

ITF It: translation for a ep patent filed

Owner name: BUGNION S.P.A.

REF Corresponds to:

Ref document number: 69502525

Country of ref document: DE

Date of ref document: 19980625

ET Fr: translation filed
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

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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

Ref country code: FR

Payment date: 20040309

Year of fee payment: 10

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

Ref country code: GB

Payment date: 20040310

Year of fee payment: 10

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

Ref country code: DE

Payment date: 20040325

Year of fee payment: 10

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

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050313

Ref country code: GB

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

Effective date: 20050313

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

Ref country code: DE

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

Effective date: 20051001

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20050313

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

Ref country code: FR

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

Effective date: 20051130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20051130