EP0588259B1 - Recyclage de l'eau de compensation de la poussée axiale - Google Patents

Recyclage de l'eau de compensation de la poussée axiale Download PDF

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Publication number
EP0588259B1
EP0588259B1 EP93114585A EP93114585A EP0588259B1 EP 0588259 B1 EP0588259 B1 EP 0588259B1 EP 93114585 A EP93114585 A EP 93114585A EP 93114585 A EP93114585 A EP 93114585A EP 0588259 B1 EP0588259 B1 EP 0588259B1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure
space
stage
axial thrust
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
EP93114585A
Other languages
German (de)
English (en)
Other versions
EP0588259A1 (fr
Inventor
Jörg Urban
Hans-Dieter Sturm
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.)
KSB AG
Original Assignee
KSB AG
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 KSB AG filed Critical KSB AG
Publication of EP0588259A1 publication Critical patent/EP0588259A1/fr
Application granted granted Critical
Publication of EP0588259B1 publication Critical patent/EP0588259B1/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
    • F04D29/10—Shaft sealings
    • F04D29/12—Shaft sealings using sealing-rings
    • F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
    • F04D29/128—Shaft sealings using sealing-rings especially adapted for liquid pumps with special means for adducting cooling or sealing fluid
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/041—Axial thrust balancing
    • F04D29/0416—Axial thrust balancing balancing pistons

Definitions

  • the invention relates to a centrifugal pump.
  • DE-PS 465 383 shows a shared relief water flow.
  • the partial flow having a higher pressure is optionally introduced into the suction chamber or into the pressure chamber by one of the pump stages.
  • a partial flow of lower pressure which emerges after passing a throttle section in front of the gland sealing the shaft, is discharged into the open.
  • the subject of DE-PS 539 225 which is equipped with a multi-stage relief device, functions in a similar manner.
  • the partial flow of the relief water that accumulates in the space between the shaft seal and the relief device is discharged outdoors.
  • the relief device has a number of stages which corresponds to the number of stages of the pump. Since a partial pressure of 50 bar is to be reduced in each relief stage, a complex piping system is used. According to a selected scheme, this connects the individual relief stages with precisely assigned pump stages, in order to guarantee the specified pressure drop.
  • DE-PS 1 094 592 From DE-PS 1 094 592 it is known that the water that accumulates directly behind the relief device and in front of the shaft seal formed by a stuffing box the suction nozzle or the inlet tank of the pump is supplied.
  • the subject of DE-OS 1 403 846 makes use of the same principle in a complex control engineering implementation.
  • a multi-stage centrifugal pump with mechanical seals is known from US Pat. No. 3,999,882, which has a pressure reducing device behind the last pump stage. Any fluid that escapes from this is fed into the suction port of the centrifugal pump with a return line. Further connecting lines connected to the return line cause a feed into a mechanical seal space, with a large number of throttle elements which are complex to adapt serve to guide the flow. The possible cooling of the mechanical seals and the saving of a heat exchanger is only possible at low temperatures.
  • the invention is therefore based on the problem of developing a less complex solution, with the aid of which a mechanical seal directly acted upon by the relief water can be used in a temperature range> 120 ° C. in multi-stage feed pumps.
  • the solution to this problem is given in the patent claim.
  • the usual and known procedure to connect the space before the shaft seal to the pump suction side ensures a high pressure drop in this room. This relieves the shaft seal considerably, so that the stuffing boxes usually used only have to prevent steam from escaping.
  • Mechanical seals cannot be used for this, however, since they rely on liquid lubrication of the parts sliding on one another. Under such operating conditions, an additional cooling device for a mechanical seal is unavoidable, so as to avoid evaporation of the relief water located in the mechanical seal space.
  • the invention now goes a completely different way by completely dispensing with the use of cooling devices. Instead, the mechanical seal used is directly exposed to the hot relief water. The risk that, due to the additional frictional heat in the sealing gap, evaporation of the relief water occurs and thus the sliding surfaces are destroyed, the invention prevents.
  • the mechanical seal space is connected to the first pump stage or a pump stage of higher pressure by means of a return line. As a result, a pressure is maintained in the mechanical seal space, which prevents the liquid in the space from evaporating, even at high temperatures.
  • the pressure conditions are designed so that there is always a pressure at the mechanical seal that corresponds to the vapor pressure of a conveying medium temperature that is approximately 20 ° C. above the operating temperature of the conveying medium. Since all components of the mechanical seal are matched to the high temperature range, their reliable use is guaranteed when operating in the desired temperature range. Evaporation in the area of the sliding surfaces is thus prevented in the simplest way.
  • a multi-stage pump (1) is equipped with a relief device (2), which is followed by a mechanical seal space (3) for sealing the shaft (4).
  • the relief water emerging from the relief device (2) cools and lubricates the mechanical seal (5) directly.
  • this is connected to the pressure chamber (7) of the first pump stage (8) by a return line (6).
  • the pressure prevailing here prevents the hot liquid in the mechanical seal chamber (3) from evaporating.
  • the return line (6) can also open into another, high-pressure space of the first or another pump stage of higher pressure.
  • This system can be used advantageously for pumps with a drive shaft passage on the pressure side, since the suction side of this machine can therefore be made medium-lubricated.
  • a shaft passage on the suction side would, on the other hand, Mechanical seal always means the application of the inlet pressure or the sealing space would have to be delimited in a complex manner with a throttle system.

Landscapes

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

Claims (1)

  1. Pompe centrifuge (1), de construction à plusieurs étages, en particulier pompe d'alimentation avec un dispositif (2) de décharge pour la poussée axiale, avec une garniture d'arbre (5) en aval du dispositif de décharge, dans lequel le liquide qui sort du dispositif de décharge coule directement dans une chambre (3) d'étanchéité de l'arbre, dans lequel la garniture de l'arbre a la forme d'une garniture à anneau glissant (5) et dans lequel une conduite de retour (6) provenant d'une chambre (3) de garniture à anneau glissant est reliée à une chambre sous pression du premier étage (8) de la pompe ou à un étage de la pompe d'une pression supérieure.
EP93114585A 1992-09-14 1993-09-10 Recyclage de l'eau de compensation de la poussée axiale Expired - Lifetime EP0588259B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4230715A DE4230715A1 (de) 1992-09-14 1992-09-14 Entlastungswasserrückführung
DE4230715 1992-09-14

Publications (2)

Publication Number Publication Date
EP0588259A1 EP0588259A1 (fr) 1994-03-23
EP0588259B1 true EP0588259B1 (fr) 1996-03-27

Family

ID=6467919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93114585A Expired - Lifetime EP0588259B1 (fr) 1992-09-14 1993-09-10 Recyclage de l'eau de compensation de la poussée axiale

Country Status (2)

Country Link
EP (1) EP0588259B1 (fr)
DE (2) DE4230715A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8870521B2 (en) 2009-06-04 2014-10-28 Ksb Aktiengesellschaft Sealing system for centrifugal pumps

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19518564A1 (de) * 1995-05-20 1996-11-21 Klein Schanzlin & Becker Ag Kreiselpumpe zur Förderung heißer Medien
DE29704389U1 (de) * 1997-03-11 1997-05-07 Feodor Burgmann Dichtungswerke GmbH & Co, 82515 Wolfratshausen Leckagerückführanordnung bei einer Dichtungseinrichtung
CN105952650A (zh) * 2016-05-31 2016-09-21 浙江南元泵业有限公司 高强度多级卧式水泵

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE465383C (de) * 1928-09-15 Esslingen Maschf Hydraulische Vorrichtung zum Ausgleich des Axialschubs bei mehrstufigen Hochdruckkreiselpumpen
DE539225C (de) * 1931-11-26 Georg Weyland Axialschubentlastung mittels stufenfoermiger Entlastungsscheiben
FR357497A (fr) * 1905-03-24 1905-12-28 Lea Degen Pump Company Pompe centrifuge
US1927543A (en) * 1932-02-03 1933-09-19 Ingersoll Rand Co Sealing device
DE681087C (de) * 1936-05-29 1939-09-15 Rudolf Duemmerling Einrichtung an Kreiselpumpen zur Entlastung von axialem Schub
DE1403846A1 (de) * 1961-11-10 1968-10-31 Klein Schanzlin & Becker Ag Kreiselpumpe
CA957563A (en) * 1970-12-21 1974-11-12 Carl J. Blom Multistage pump and manufacturing method
US3999882A (en) * 1975-03-17 1976-12-28 Dresser Industries, Inc. Flushing and cooling system for shaft seals and pumps
US4128362A (en) * 1977-04-22 1978-12-05 Dresser Industries, Inc. Flushing and cooling system for pumps
CH662865A5 (de) * 1984-03-19 1987-10-30 Sulzer Ag Topfgehaeuse fuer eine kreiselpumpe.
DE8601166U1 (de) * 1986-01-18 1986-02-27 Sihi Gmbh & Co Kg, 2210 Itzehoe Pumpe zur Förderung von Heißwasser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8870521B2 (en) 2009-06-04 2014-10-28 Ksb Aktiengesellschaft Sealing system for centrifugal pumps

Also Published As

Publication number Publication date
DE59302033D1 (de) 1996-05-02
EP0588259A1 (fr) 1994-03-23
DE4230715A1 (de) 1994-03-17

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