WO2019052848A1 - Garniture d'étanchéité au gaz sans contact adaptative au niveau d'arbres de machine - Google Patents

Garniture d'étanchéité au gaz sans contact adaptative au niveau d'arbres de machine Download PDF

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Publication number
WO2019052848A1
WO2019052848A1 PCT/EP2018/073675 EP2018073675W WO2019052848A1 WO 2019052848 A1 WO2019052848 A1 WO 2019052848A1 EP 2018073675 W EP2018073675 W EP 2018073675W WO 2019052848 A1 WO2019052848 A1 WO 2019052848A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing
gap
shaft
seal
sealing ring
Prior art date
Application number
PCT/EP2018/073675
Other languages
German (de)
English (en)
Inventor
Moritz Ackermann
Mario Koebe
Christian Lyko
Uwe Steinmeyer
Markus Wysgol
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2019052848A1 publication Critical patent/WO2019052848A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/441—Free-space packings with floating ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F16J15/406—Sealings between relatively-moving surfaces by means of fluid by at least one pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/445—Free-space packings with means for adjusting the clearance
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/09—Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators

Definitions

  • the invention relates to a contactless gas seal between the shaft and housing of a machine, in particular hydrogen ⁇ cooled generator.
  • Hydrogen-cooled generators are protected at the penetration of the generator rotor through the front-side housing walls by means of a contactless shaft seal against escaping hydrogen gas.
  • pressurized oil film which is formed by a continuous flow of oil through the sealing gap.
  • ⁇ nde ⁇ stakes in the sealing gap by different temperature conditions, as well as operating conditions lead to a change in oil pressure, which is a potential risk due to escaping What ⁇ hydrogen gas.
  • the volume flow is increased or reduced by the oil supply unit, so that ultimately the tightness of the shaft seal is ensured. Since the size of the gap influences the required volumetric flow exponentially, very large volume flows and changes are necessary for this, which has a detrimental effect on the dimensioning of the oil supply.
  • segmented shaft seals completely close the sealing gap in the event of a completely failing oil supply via changed pressure conditions and / or restoring elements, so that a contacting shaft seal is present in this extreme case.
  • seals are used only in cylindrical areas of the rotor.
  • the seal is rigid in axia ler direction connected to the housing.
  • a Dichtspaltände- control via abrasive layers in the seal area can not be compensated from ⁇ .
  • DE200109219 a measuring system for monitoring the tightness of a contactless gas seal is already described.
  • the invention is based on the problem of specifying a non-contact gas seal, are compensated in the sealing gap changes on the one hand due to different thermal expansion of sealing ring and shaft and on the other due to abrasive layers in the sealing area.
  • the invention realizes an adaptive contactless gas like ⁇ processing on rotating shafts through a conical shaft portion.
  • a seal with a conical sealing surface connected to the housing cooperates with the conical region of the shaft via a sealing gap, whereby the sealing gap is actively influenced.
  • a sealing gap change over abrasive layers in the sealing area but also over different thermal expansion of the sealing ring and shaft can be compensated in the cone-shaped geometry via an axial displacement.
  • Advantages in the invention are also the lower product costs for the oil supply unit. Since the fluctuations in erfor ⁇ sary flow can be reduced to a minimum, the requirements for pumps, valves, coolers, filters, piping et cetera are also redu to a necessary minimum ⁇ sheet. Smaller system components can be used which cause lower product costs of the oil supply. All of this contributes to a competitive product, especially turbogenerator.
  • Advantageous developments of the invention are specified in the subclaims. The invention is explained in more detail below as an exemplary embodiment in a scope necessary for understanding with reference to a figure. Showing:
  • FIG. 1 shows a contactless gas seal according to the invention between the shaft and the housing of a machine
  • the rotor 1 is provided in the sealing area with a conical shape 2.
  • the gasket 4 in this area also has a conical shape.
  • the seal is not fixedly connected to the housing, but is guided in a sealing ring housing 5, which in turn can be moved via an actuator 8 in the axial direction.
  • the actuator may be provided by a servomotor, a stepping motor, a hydraulic element or a piezoelectric actuator.
  • the sealing gap is set by active influence by Aktua ⁇ tor to the predetermined width of the nominal gap. This is done by axial displacement of the sealing ring.
  • the width of the nominal gap can be adjusted by axial displacement of the sealing ring by means of actuator in accordance with a regulation of the oil flow to constant oil pressure.
  • the oil pressure in the sealing area can be taken as the control variable here. In the nominal operating state of the machine, this then has a defined oil pressure in the sealing area. If the rotor changes its position and this leads to a change in the column 6, through which the oil flows, a controller can recognize this and set by the axial displacement of the sealing ring again the nominal gap. For example, if the oil pressure becomes greater, that is, the gaps become smaller, the regulator can move the gasket away from the cone until the nominal pressure returns; the pressure gets smaller, the Gasket moves toward the cone, the gaps get smaller, the pressure rises again.
  • the sealing ring can always optimally adapt to the radial movements of the shaft / rotor even with the cone shape according to the invention.
  • the conical portion of the shaft preferably has a Win ⁇ angle of about 15 degrees relative to the shaft axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne une garniture d'étanchéité au gaz adaptative sans contact au niveau de l'arbre rotatif (1) d'un générateur refroidi à l'hydrogène. Une garniture d'étanchéité (4), reliée au boîtier (3) et présentant une surface d'étanchéité conique, coopère avec la région d'arbre conique (2) par le biais d'un intervalle d'étanchéité (6) lavé à l'huile. L'intervalle d'étanchéité est réglé par influence active sur la largeur prédéterminée de l'intervalle nominal à l'aide d'un actionneur (8). Cela est effectué par déplacement axial de la bague d'étanchéité. La largeur de l'intervalle nominale peut être réglée à une pression d'huile constante par déplacement axial de la bague d'étanchéité à l'aide d'un actionneur en fonction du réglage du débit d'huile (7). Une variation d'intervalle d'étanchéité peut être compensée par des couches abrasives situées dans la zone d'étanchéité mais également par des dilatations thermiques différentes de la bague d'étanchéité et de l'arbre.
PCT/EP2018/073675 2017-09-14 2018-09-04 Garniture d'étanchéité au gaz sans contact adaptative au niveau d'arbres de machine WO2019052848A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017216248.1A DE102017216248A1 (de) 2017-09-14 2017-09-14 Adaptive kontaktlose Gasdichtung an Maschinenwellen
DE102017216248.1 2017-09-14

Publications (1)

Publication Number Publication Date
WO2019052848A1 true WO2019052848A1 (fr) 2019-03-21

Family

ID=63557432

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/073675 WO2019052848A1 (fr) 2017-09-14 2018-09-04 Garniture d'étanchéité au gaz sans contact adaptative au niveau d'arbres de machine

Country Status (2)

Country Link
DE (1) DE102017216248A1 (fr)
WO (1) WO2019052848A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230324A (en) * 1977-12-23 1980-10-28 K. G. Derman Ab Device for sealing an annular opening between a shaft and housing surrounding the shaft
DE8533308U1 (de) * 1985-11-27 1986-02-06 A. Friedr. Flender Gmbh & Co Kg, 4290 Bocholt Drehdichtung
EP0769111B1 (fr) * 1994-06-20 2002-08-14 A.W. Chesterton Co. Ensemble comprenant un joint d'etancheite et un palier de roulement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011005308A1 (de) * 2011-03-09 2012-09-13 Lenze Drives Gmbh Wellendichtungssystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4230324A (en) * 1977-12-23 1980-10-28 K. G. Derman Ab Device for sealing an annular opening between a shaft and housing surrounding the shaft
DE8533308U1 (de) * 1985-11-27 1986-02-06 A. Friedr. Flender Gmbh & Co Kg, 4290 Bocholt Drehdichtung
EP0769111B1 (fr) * 1994-06-20 2002-08-14 A.W. Chesterton Co. Ensemble comprenant un joint d'etancheite et un palier de roulement

Also Published As

Publication number Publication date
DE102017216248A1 (de) 2019-03-14

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