EP1314895B1 - Wellenwärmedämmhülse - Google Patents

Wellenwärmedämmhülse Download PDF

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Publication number
EP1314895B1
EP1314895B1 EP02292872A EP02292872A EP1314895B1 EP 1314895 B1 EP1314895 B1 EP 1314895B1 EP 02292872 A EP02292872 A EP 02292872A EP 02292872 A EP02292872 A EP 02292872A EP 1314895 B1 EP1314895 B1 EP 1314895B1
Authority
EP
European Patent Office
Prior art keywords
ring
shaft
nickel alloy
external
shrunk
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
EP02292872A
Other languages
English (en)
French (fr)
Other versions
EP1314895A1 (de
Inventor
Louis Mazuy
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.)
Areva NP SAS
Original Assignee
Jeumont SA
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 Jeumont SA filed Critical Jeumont SA
Priority to SI200230888T priority Critical patent/SI1314895T1/sl
Publication of EP1314895A1 publication Critical patent/EP1314895A1/de
Application granted granted Critical
Publication of EP1314895B1 publication Critical patent/EP1314895B1/de
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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/08—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive

Definitions

  • the present invention relates to a thermal protection screen for a rotating shaft, in particular for a nuclear plant primary pump shaft such as that described by the document EP 0 844 399 which is considered the state of the art.
  • these primary pumps comprise a heat exchanger called a thermal barrier, which cools the water supplying a hydrodynamic bearing and the rotating seals with the longitudinal shaft. There is therefore a transition zone between hot and cold water located at the bottom of the thermal barrier.
  • the part of the tree located in this transition zone is therefore subjected to a significant thermal gradient which favors the thermal instabilities that can create cracks in the tree.
  • a heat shield is placed on the shaft in the zone where the thermal gradient is greatest.
  • this heat shield is formed by a stainless steel ring surrounding the shaft in said transition zone. This solution is not enough to completely guard against the risk of cracking, because after a few years of operation, cracks can appear in various places in the tree below this ring.
  • the object of the invention is to propose a thermal protection screen which makes it possible to improve the effectiveness of the protection and thus to reduce the risk of cracking in the shaft.
  • the subject of the invention is therefore a thermal protection screen for a rotating shaft, in particular for a primary pump shaft of a nuclear power plant, characterized in that it comprises, in the thermal transition zone between the hot fluid and the cold fluid a ring of nickel alloy shrunk on said shaft surrounded by an outer ring of austenitic stainless steel shrunk at each of its ends on said nickel alloy ring and comprising, between the two fretted ends, a cylindrical recess for forming a clearance with the outer surface of said nickel alloy ring
  • FIG. 1 schematically shows a portion of a primary pump of a nuclear power plant and which is intended to convey hot water at a temperature of the order of 300 ° C.
  • this pump comprises a so-called hot bottom portion in which the hot water circulates at a temperature of about 300 ° C. and a so-called cold upper portion B in which the cold water circulates at about 40 ° C.
  • Zones A and B are traversed by a shaft 1 and the lower part comprises, in a conventional manner, a wheel 2 and a pump volute 3.
  • the upper part B comprises a casing 4, a hydrodynamic bearing 5 and rotating sealing seals 6.
  • the housing 4 is fixed to the volute 3 by means of removable connecting elements 7, such as studs.
  • the pump comprises a heat exchanger 8 called thermal barrier, which cools the water supplying the hydrodynamic bearing 5 and the rotating sealing seals 6.
  • transition zone C Between the so-called lower hot part and the so-called cold upper part B, there is a transition zone C between the hot and cold water at the bottom of the heat exchanger 8 and in which the zone of the shaft is subjected to a large thermal gradient of about 260 ° C.
  • the shaft 1 is equipped with a thermal protection screen designated as a whole by the reference numeral 10.
  • the thermal protection screen 10 comprises, in the thermal transition zone C between the hot fluid and the cold fluid, a ring 11 of nickel alloy shrunk along its length on said shaft 1.
  • the nickel alloy constituting the ring 11 is chosen so that the metal / metal contact between the shaft 1 which is austenitic stainless steel and this nickel alloy ring 11 is retained in the current operating situations.
  • the characteristics of the nickel alloy make it possible to ensure this contact thanks to its lower coefficient of expansion than that of the metal constituting the shaft 1 and also its ability to withstand the thermal transients without plasticizing.
  • the nickel alloy ring 11 is surrounded by an outer ring 15 of austenitic stainless steel.
  • This outer ring 15 is shrunk at each of its ends on the nickel alloy ring 11 and has between the two fretted ends a cylindrical recess 16 to form a clearance with the outer surface of said ring 11.
  • the outer ring 15 protects the ring 11 of nickel alloy against the instabilities of the transition zone between hot and cold water.
  • the clearance formed by the recess 16 is fixed in such a way that the outer ring 15 deformed by the thermal gradient in a nominal operating situation comes into contact with the outer surface of the ring 11 made of nickel alloy.
  • This deformation makes it possible to eliminate or minimize the film of water that can circulate between the two rings 11 and 15 because the circulation of water between said rings promotes thermal fatigue.
  • the thermal insulation is also improved thanks to the presence of the ring 11 nickel alloy which has a low conductivity.
  • the total length of the fretted ends of the outer ring 15 on the nickel alloy ring 11 is about 20% of the length of this outer ring 15.
  • the protective screen 10 comprises a transverse pin 17 of austenitic stainless steel connecting the rings 11 and 15 with the shaft 1.
  • This pin 17 is mounted in an orifice 18 formed in the shaft 1 and the rings 11 and 15 and the free end 17a of this pin 17 is welded to the outer ring 15.
  • the wall of the cylindrical recess 16 of the outer ring 15 has annular portions 16a projecting to reduce the clearance between the wall of the recess and the outer face of the ring 11 nickel alloy.
  • the projecting portions 16a are distributed equidistantly.
  • the shaft 1 After disassembly of the nickel alloy ring 11 and possibly the outer ring 15, the shaft 1 is dug locally to eliminate cracks.
  • a split ring 20 is arranged and the adjacent edges of the slot 21 of this ring are secured together by a weld bead 22 ( Fig. 5 ), or by at least one radial pin 23 ( Fig. 6 ) or by gluing or by means of a winding of thread.
  • This winding is placed in a groove, not shown, formed in the ring 20, preferably in the upper part of this ring 20. The width of this groove is determined to receive at least two turns of wire, the latter is welded to its two ends in the back of the throat.
  • the ring 11 or the rings 11 and 15 according to the embodiment, are then again mounted on the shaft 1.
  • the split ring 20 is made of a material whose coefficient of expansion is identical to the material of the shaft 1.
  • the shrinking of the nickel alloy ring 11 and the placement of the split ring 20 avoid the presence of moving water and thus provide effective thermal protection.
  • the thermal protection screen according to the invention makes it possible to obtain a more efficient thermal protection of the shaft, in particular thanks to the presence of the nickel alloy ring, while maintaining a bulk identical to the solutions used until now.
  • the thermal gradients in the shaft are attenuated and are more gradual so that the risk of cracking of the shaft, especially in the case of a primary pump shaft, are thereby reduced.

Landscapes

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

Claims (6)

  1. Wärmeschutzschirm für eine Drehwelle (1), insbesondere für eine primäre Pumpenwelle in einem Kernkraftwerk, dadurch gekennzeichnet, dass er in der thermischen Übergangszone zwischen dem heißen Fluid und dem kalten Fluid eine Hülse (11) aus Nickellegierung umfasst, die auf die genannte Welle (1) aufgeschrumpft ist und von einer Außenhülse (15) aus austenitischem rostfreiem Stahl umgeben ist, die an jedem ihrer Enden auf diese Hülse (11) aus Nickellegierung aufgeschrumpft ist und zwischen den beiden aufgeschrumpften Enden eine zylindrische Aussparung (16) aufweist, um mit der Außenfläche der genannten Hülse (11) aus Nickellegierung einen Spielraum zu bilden.
  2. Schirm nach Anspruch 1, dadurch gekennzeichnet, dass die Wand der zylindrischen Aussparung (16) der Außenhülse (15) vorstehende ringförmige Abschnitte (16a) aufweist, die das Spiel zwischen der genannten Wand und der Außenfläche der Hülse (11) aus Nickellegierung reduzieren.
  3. Schirm nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Gesamtlänge der aufgeschrumpften Enden der Außenhülse (15) etwa 20 % der Länge dieser Hülse (15) ausmacht.
  4. Schirm nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass er einen Querzapfen (17) aus austenitischem rostfreiem Stahl zum Verbinden der Hülse (11) aus Nickellegierung und der Außenhülse (15) aus austenitischem rostfreiem Stahl mit der Welle (1) umfasst, wobei der genannte Zapfen (17) in einer in der Welle (1) und den Hülsen (11; 15) vorgesehenen Öffnung (18) montiert ist und wobei das freie Ende (17a) dieses Zapfens (17) an der Außenhülse (15) angelötet ist.
  5. Schirm nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Welle (1) in der Höhe des unteren Teils der Hülse (11) aus Nickellegierung eine Aussparung aufweist, in der eine geschlitzte Hülse (20) montiert ist.
  6. Schirm nach Anspruch 5, dadurch gekennzeichnet, dass die geschlitzte Hülse (20) aus einem Material gefertigt ist, dessen Ausdehnungskoeffizient mit dem des Materials der Welle (1) identisch ist.
EP02292872A 2001-11-21 2002-11-19 Wellenwärmedämmhülse Expired - Lifetime EP1314895B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200230888T SI1314895T1 (sl) 2001-11-21 2002-11-19 Termična bariera za rotacijsko gred

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0115076A FR2832543B1 (fr) 2001-11-21 2001-11-21 Ecran de protection thermique pour un arbre tournant
FR0115076 2001-11-21

Publications (2)

Publication Number Publication Date
EP1314895A1 EP1314895A1 (de) 2003-05-28
EP1314895B1 true EP1314895B1 (de) 2010-01-06

Family

ID=8869642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02292872A Expired - Lifetime EP1314895B1 (de) 2001-11-21 2002-11-19 Wellenwärmedämmhülse

Country Status (5)

Country Link
US (1) US7021908B2 (de)
EP (1) EP1314895B1 (de)
ES (1) ES2338991T3 (de)
FR (1) FR2832543B1 (de)
SI (1) SI1314895T1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004052796A1 (de) * 2004-11-02 2006-05-11 Volkswagen Ag Antriebswelle mit einer Wärmeabschirmhülse
FR3002295B1 (fr) * 2013-02-20 2016-07-01 Jspm - Jeumont Systemes De Pompes Et De Mecanismes Pompe comprenant un ecran de protection de la roue de pompe contre un ecoulement d'un fluide de refroidissement le long du moyeu de la roue
US9303688B2 (en) * 2013-07-02 2016-04-05 Dresser-Rand Company Thermal barrier coating for bearing journal surfaces of rotary shafts

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194083A (en) * 1964-05-11 1965-07-13 Gen Electric Hollow power transmission members
GB1151742A (en) * 1965-06-24 1969-05-14 Hayward Tyler & Company Ltd Improvements in or relating to Glandless Electric Motor Driven Pumps
US4127080A (en) * 1977-03-08 1978-11-28 Lakiza Rostislav I Tubular shaft of a marine line shafting
US5072608A (en) * 1988-05-18 1991-12-17 Bw/Ip International, Inc. Reduction of transient thermal stresses in machine components
US4820119A (en) * 1988-05-23 1989-04-11 United Technologies Corporation Inner turbine seal
US4932836A (en) * 1988-06-10 1990-06-12 Bw/Ip International, Inc. Pump with heat exchanger
US5332358A (en) * 1993-03-01 1994-07-26 General Electric Company Uncoupled seal support assembly
FR2756328B1 (fr) * 1996-11-22 1998-12-31 Jeumont Ind Barriere thermique de pompe primaire
US6328541B1 (en) * 2000-03-07 2001-12-11 Westinghouse Electric Company Llc Thermal barrier and reactor coolant pump incorporating the same
US6358000B1 (en) * 2000-06-06 2002-03-19 Westinghouse Electric Company Llc Method of repairing a reactor coolant pump shaft and a reactor coolant pump repaired by such method
FR2812117B1 (fr) * 2000-07-24 2003-01-31 Jeumont Ind Ecran de protection thermique pour un arbre tournant

Also Published As

Publication number Publication date
SI1314895T1 (sl) 2010-05-31
US20030136553A1 (en) 2003-07-24
EP1314895A1 (de) 2003-05-28
ES2338991T3 (es) 2010-05-14
FR2832543A1 (fr) 2003-05-23
US7021908B2 (en) 2006-04-04
FR2832543B1 (fr) 2006-04-14

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