EP0744551B1 - Pompe centrifuge pour le transport de fluides chauds - Google Patents

Pompe centrifuge pour le transport de fluides chauds Download PDF

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Publication number
EP0744551B1
EP0744551B1 EP96106606A EP96106606A EP0744551B1 EP 0744551 B1 EP0744551 B1 EP 0744551B1 EP 96106606 A EP96106606 A EP 96106606A EP 96106606 A EP96106606 A EP 96106606A EP 0744551 B1 EP0744551 B1 EP 0744551B1
Authority
EP
European Patent Office
Prior art keywords
sealing
pump
cooling
medium
sealing element
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
EP96106606A
Other languages
German (de)
English (en)
Other versions
EP0744551A1 (fr
Inventor
Jörg Urban
Waldemar Schwartz
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 EP0744551A1 publication Critical patent/EP0744551A1/fr
Application granted granted Critical
Publication of EP0744551B1 publication Critical patent/EP0744551B1/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
    • F04D29/106—Shaft sealings especially adapted for liquid pumps
    • F04D29/108—Shaft sealings especially adapted for liquid pumps the sealing fluid being other than the working liquid or being the working liquid treated
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the invention relates to a sealing arrangement for a centrifugal pump for delivery hot media, consisting of at least one in the range Shaft bushing arranged mechanical seal, a cooling circuit for Cooling of the mechanical seal, with a partial flow of the pumped medium as Cooling medium of the mechanical seal can be used.
  • DE-A-27 37 294 is a multi-stage pump construction known, which is equipped with external bearing housings.
  • the Bearing housings are placed in front of the pump Mechanical seals that are exposed to the pumped medium.
  • the Mechanical seals in turn are preceded by throttle sections, with the help of which Pressure reduction is intended. are downstream in the direction of flow Return lines with which the medium is returned to the suction port.
  • DE-A-26 45 755 which is a centrifugal pump to promote toxic media.
  • the mechanical seal chamber is used a medium with higher pressure is fed in from the outside. This ensures that in the event of any leaks, the medium fed into the pump flows in and not vice versa.
  • a shaft seal for centrifugal pumps is known is arranged in the area of the shaft end and at the housing outlet.
  • the Shaft seal consists of one arranged on the atmosphere side hydrodynamic mechanical seal and another pump-side Seal, being in a located between the two seals Sealing chamber for cooling and the removal of dirt particles serving circular stream is initiated.
  • the pump-side seal is as hydrodynamic mechanical seal formed by a in the Sealing chamber arranged, this connecting to the pump interior, the targeted leakage bypass is bridged. With the help of this measure an external cooling device can be saved and an improvement in service life the seal can be reached.
  • the seal chamber itself is from the pressure port Centrifugal pump charged with the medium to ensure that the function of the Mechanical seal to ensure necessary pressure. This pressure is over the second mechanical seal with the help of targeted leakage into the pump interior derived.
  • the second mechanical seal thus acts as a throttle Pressure reduction.
  • their use increases the manufacturing costs of the entire pump unit.
  • FR-A 21 88 727 has a mechanical seal housing arranged therein cooled mechanical seals in tandem known.
  • the mechanical seal housing two mechanical seal spaces by a pump device separated from each other.
  • a pump device Starting from the mechanical seal housing of an outlet bore, a several valves, a filter and a heat exchanger having recirculation circuit connected.
  • the pumping device conveys from the first mechanical seal space Coolant in the second mechanical seal space facing the high pressure side of the pump and from there to the recirculation line.
  • For the promotion of hot media is between the hot pump room and the one facing it second mechanical seal space arranged a heat barrier with which the heat transfer from the pump to the mechanical seal housing.
  • the invention has for its object for centrifugal pumps with one operation up 160 ° C medium temperature safe and inexpensive cooling of a Realize mechanical seal.
  • This problem is solved with the Features of claim 1.
  • circulating cooling medium among others, can also be from the drive motor generated cooling air flow can be used.
  • the circulating in the cooling circuit Pumped medium is separated from the other pumped medium by the sealing element separated, so that in normal operation a mixture between these areas is prevented.
  • the pressure equalization between the seal chamber and the interior of the pump relieves the load in between in the simplest way Sealing element.
  • the pump interior includes all the rooms that are in front of the Mechanical seal space are arranged.
  • the sealing element can Invention can be designed as a simple, touching sealing ring. Its material properties are chosen so that it compared to the prevailing temperatures is stable. The pressure equalization with the help of a simple pressure relief drilling does not require any special manufacturing technology Activities. A sealing lip of the sealing element is therefore not one Exposed to stress, so that special treatment of a pump shaft or a shaft protection sleeve located on it is unnecessary.
  • the promotional effect within the cooling circuit is by the mechanical seal itself or with it connected auxiliary devices generated. The cooling circuit transports it Heat from the material of the pump to the Coolant is transferred. Otherwise forms within the cooling circuit a thermosiphon circuit, which is also in a warm state in Ready position centrifugal pump for sufficient cooling of the Mechanical seal ensures.
  • the sealing ring which is the Mechanical seal is connected upstream, prevents the simplest in normal operation Way a heat exchange with the hot medium.
  • a feed of hot fluid in the cooling medium only takes place when through a Seal leakage the pressure within the cooling circuit should drop. Only in In such cases, lost cooling medium becomes hot Pumped medium replaced.
  • Fig. 1 is a section of a multi-stage centrifugal pump Pressure housing 1 with the last impeller 2 located therein.
  • This impeller 2 is an axial thrust compensation device 3, from which a Return line 4 to - not shown here - suction port of the centrifugal pump leads.
  • the axial thrust compensation device can also be dispensed with if the design of the pump in a different way ensures compensation, e.g. B. through opposite arrangement.
  • the axial thrust compensation device Subsequent sealing element 5, which the the axial thrust compensation device 3 containing space 6 of an actual one, a mechanical seal 7 contained seal space 8 separates.
  • the seal chamber 8 has a Drain line 9, through which heated medium flows to the outside - not here shown - cooler passes and as a cooled medium through line 10 in Area of an opening 11 in the seal space 8 of the seal housing 12 is introduced.
  • the contacting sealing element (5) designed here as a sealing ring lies on rotating part of the pump, in the embodiment shown on a Shaft protection sleeve (14) which is pushed over a pump shaft (22).
  • the Sealing element or the sealing ring (5) can also directly on a Place the pump shaft (22) or another rotating pump part in a sealing manner. He effectively prevents an exchange between the hot Pumped medium and the cooling medium having a lower temperature takes place. At most in the situations in which leakage in the area of The mechanical seal of the cooling medium must be replaced by the pumped medium Inflow of fluid.
  • the medium flows from the area of the last impeller (2) through a Bearing gap (13) for the axial thrust compensation device, which may be arranged (3).
  • the hot fluid flows in front of the chamber (6) Sealing ring (5) over the column (15, 16, 17) in a collecting space (18), from where from it through a return line (4) the suction port or a low point Pressure of the centrifugal pump is supplied.
  • This is here as a simple through hole formed and, as shown, the sealing element (5) in one Pierce the recess (20). So there is a touching effect Sealing element (5) pressure equalization, whereby a sealing lip (21) significantly is less polluted.
  • a non-contact sealing element, for example in the form of a labyrinth seal would be unsuitable because its sealing effect is not sufficient and excessive heat transfer due to the flow of hot Pumped medium would take place.
  • the seal housing is therefore heated exclusively by heat transfer to the metallic parts.
  • Seal housing (12) also a material with a low heat transfer coefficient Use, e.g. B. an austenitic steel, a ceramic material or other insulating materials, then the one used Mechanical seal without any problems at 160 ° C fluid temperature or higher be used.
  • the circled sealing element in Fig. 1 is in Fig. 2 in an enlarged view shown.
  • the form of the pressure compensation device selected here has the additional advantage that it is also an anti-rotation device for the sealing element forms.
  • the embodiment of a pressure compensation device selected here (19) consists of a penetrating the wall surface of the collecting space (18) tubular component. It extends into a part of its length Recess (20) of the sealing element (5) into it, which is thus in its position is held against rotation.
  • the recess (20) allows a U-shaped design during installation, simply insert the sealing element (5) into the Installation position.
  • the pressure compensation device (19) can in one simple form be designed as a dowel pin. When arranged on one other than the location shown, the axial length increases slightly, but the system as such is still functional.

Landscapes

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

Claims (6)

  1. Dispositif d'étanchéité pour une pompe centrifuge destinée au transport de fluides chauds, se composant d'au moins une garniture étanche à anneau glissant disposée dans la région d'un passage d'arbre, d'un circuit de refroidissement pour le refroidissement de la garniture étanche à anneau glissant, dans lequel le fluide de refroidissement et le fluide refoulé sont identiques, et le circuit de refroidissement est pourvu d'un refroidisseur, caractérisé en ce qu'un élément d'étanchéité (5) est disposé entre une chambre de la garniture étanche à anneau glissant (8) avec une garniture étanche à anneau glissant (7) disposée dans celle-ci et un espace intérieur de la pompe et s'applique de façon étanche sur la partie rotative (14, 22) de la pompe, et en ce qu'un dispositif de compensation de pression (19) est disposé entre la chambre de la garniture étanche à anneau glissant (8) et l'espace intérieur de la pompe.
  2. Dispositif d'étanchéité suivant la revendication 1, caractérisé en ce que l'élément d'étanchéité (5) est constitué par un anneau d'étanchéité à contact.
  3. Dispositif d'étanchéité suivant la revendication 1 ou 2, caractérisé en ce que l'élément d'étanchéité est fabriqué à partir d'une matière plastique haut-polymère.
  4. Dispositif d'étanchéité suivant l'une quelconque des revendications 1 à 3, caractérisé en ce qu'un dispositif de compensation de pression (19) sous la forme d'une ouverture de compensation de pression est disposé entre la chambre de la garniture étanche à anneau glissant (8) et l'espace intérieur de la pompe.
  5. Dispositif d'étanchéité suivant la revendication 4, caractérisé en ce que le dispositif de compensation de pression (19) débouche dans la chambre de la garniture d'étanchéité (8) à côté d'une conduite d'évacuation (9).
  6. Dispositif d'étanchéité suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le dispositif de compensation de pression (19) repose fermement sur l'élément d'étanchéité (5) .
EP96106606A 1995-05-20 1996-04-26 Pompe centrifuge pour le transport de fluides chauds Expired - Lifetime EP0744551B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19518564 1995-05-20
DE19518564A DE19518564A1 (de) 1995-05-20 1995-05-20 Kreiselpumpe zur Förderung heißer Medien

Publications (2)

Publication Number Publication Date
EP0744551A1 EP0744551A1 (fr) 1996-11-27
EP0744551B1 true EP0744551B1 (fr) 2000-07-05

Family

ID=7762434

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96106606A Expired - Lifetime EP0744551B1 (fr) 1995-05-20 1996-04-26 Pompe centrifuge pour le transport de fluides chauds

Country Status (5)

Country Link
US (1) US5795129A (fr)
EP (1) EP0744551B1 (fr)
AT (1) ATE194412T1 (fr)
DE (2) DE19518564A1 (fr)
DK (1) DK0744551T3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29704389U1 (de) * 1997-03-11 1997-05-07 Burgmann Dichtungswerk Feodor Leckagerückführanordnung bei einer Dichtungseinrichtung
EP1087144B1 (fr) * 1999-09-23 2005-11-30 Cryomec AG Joint tandem tournant pour pompes cryogéniques
DE502006004968D1 (de) * 2006-01-12 2009-11-12 Sulzer Pumpen Ag Strömungsmaschine für ein Fluid mit einem radialen Dichtspalt
MX2011002665A (es) 2008-09-10 2011-07-28 Pentair Pump Group Inc Bomba centrifuga de multiples etapas, de alta eficiencia y metodo para ensamblado.
DE102009023907A1 (de) 2009-06-04 2010-12-09 Ksb Aktiengesellschaft Dichtungssystem für Kreiselpumpen

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090320A (en) * 1960-12-07 1963-05-21 Durametallic Corp Seals for stuffing boxes and the like permitting flushing thereof
US3825270A (en) * 1972-05-09 1974-07-23 Standun Wiper seal for apparatus such as metallic can body formers
CH572174A5 (fr) * 1972-06-09 1976-01-30 Burgmann Dichtungswerk Feodor
US4053163A (en) * 1974-12-26 1977-10-11 George Vegella Seal construction
US3999882A (en) * 1975-03-17 1976-12-28 Dresser Industries, Inc. Flushing and cooling system for shaft seals and pumps
DE2630513C2 (de) * 1976-07-07 1985-11-28 Allweiler Ag, 7760 Radolfzell Kühleinrichtung für ein Pumpenaggregat
US4121839A (en) * 1976-08-18 1978-10-24 Mitsui Toatsu Chemicals, Inc. Sealing system for use in composite multi-stage pump
DE2645755A1 (de) * 1976-10-09 1978-04-13 Klein Schanzlin & Becker Ag Wellendichtung
US4128362A (en) * 1977-04-22 1978-12-05 Dresser Industries, Inc. Flushing and cooling system for pumps
DE2925244C2 (de) * 1979-06-22 1982-09-30 Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel Abdichtungsanordnung für Stevenrohranlagen
JPS59119099A (ja) * 1982-12-24 1984-07-10 Hitachi Ltd 高温・高圧流体用回転ポンプの軸封装置
DE3324468A1 (de) * 1983-07-07 1985-01-17 Krull, Gerhard, 4803 Steinhagen Abgedichtetes waelzlager, insbesondere fuer wasserpumpen in kraftfahrzeugen
DE3342297A1 (de) * 1983-11-23 1985-06-05 Howaldtswerke-Deutsche Werft Ag Hamburg Und Kiel, 2300 Kiel Vorrichtung zum abdichten eines oelgeschmierten lagers in groesserer wassertiefe
DE8601166U1 (de) * 1986-01-18 1986-02-27 Sihi Gmbh & Co Kg, 2210 Itzehoe Pumpe zur Förderung von Heißwasser
DE3804183C2 (de) * 1988-02-11 1994-11-24 Klein Schanzlin & Becker Ag Wellendichtung für Kreiselpumpen
GB8901656D0 (en) * 1989-01-26 1989-03-15 Flexibox Ltd Shaft seal
US5180297A (en) * 1991-03-22 1993-01-19 The Gorman-Rupp Company Fluid transfer pump with shaft seal structure
DE4230715A1 (de) * 1992-09-14 1994-03-17 Klein Schanzlin & Becker Ag Entlastungswasserrückführung
DE9318143U1 (de) * 1993-11-26 1994-01-27 Abel Gmbh & Co Abgedichteter Wellenaustritt aus einem Pumpengehäuse

Also Published As

Publication number Publication date
EP0744551A1 (fr) 1996-11-27
DK0744551T3 (da) 2000-11-06
DE59605536D1 (de) 2000-08-10
US5795129A (en) 1998-08-18
DE19518564A1 (de) 1996-11-21
ATE194412T1 (de) 2000-07-15

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