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1. WO1996002767 - VIBRATION DAMPING ARRANGEMENT

Publication Number WO/1996/002767
Publication Date 01.02.1996
International Application No. PCT/GB1995/001616
International Filing Date 10.07.1995
Chapter 2 Demand Filed 30.01.1996
IPC
F16C 32/06 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS OR UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
CSHAFTS; FLEXIBLE SHAFTS; MECHANICAL MEANS FOR TRANSMITTING MOVEMENT IN A FLEXIBLE SHEATHING; ELEMENTS OF CRANKSHAFT MECHANISMS; PIVOTS; PIVOTAL CONNECTIONS; ROTARY ENGINEERING ELEMENTS OTHER THAN GEARING, COUPLING, CLUTCH OR BRAKE ELEMENTS; BEARINGS
32Bearings not otherwise provided for
06with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
CPC
F16C 32/0651
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
32Bearings not otherwise provided for
06with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
0629supported by a liquid cushion, e.g. oil cushion
064the liquid being supplied under pressure
0651Details of the bearing area per se
Applicants
  • GLACIER RPB INC. [US/US]; Mystic Packer Building 12 Roosevelt Avenue Mystic, CT 06355, US
Inventors
  • SHULTZ, Richard, R.; US
Agents
  • HAMMERSLEY, John ; T & N plc Bowdon House Ashburton Road West Trafford Park Manchester M17 1RA, GB
Priority Data
08/274,43213.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) VIBRATION DAMPING ARRANGEMENT
(FR) DISPOSITIF AMORTISSEUR DE VIBRATIONS
Abstract
(EN)
A damping arrangement (25) for damping axial vibrations in a shaft suspended (optionally) by a magnetic bearing has a radially extending thrust face (24) mounted on the shaft and separated by a small face gap (29) from a housing (30) and through which gap a stream of gas is forced by way of a flow restrictor (31) at the entrance to the gap. The flow restrictor acts with thrust face (26) to define a gap entrance related to the axial position/displacement of the shaft. A chamber (33), defined downstream of the restrictor and having exhaust passage (35), opens at neck (34) to face the thrust face and the gas pressure therein exerts axial thrust on the shaft. Axial vibration of the shaft modulates gas supply to the face gap and the chamber is dimensioned to create a phase lead of 90° for the instantaneous pressure therein and axial thrust on the shaft, thus damping the shaft vibrations causing its displacement.
(FR)
Ce dispositif amortisseur (25) (figure 1), destiné à amortir les vibrations axiales d'un arbre suspendu (éventuellement) à l'aide d'un palier magnétique, possède une surface (24) de poussée s'étendant radialement montée sur l'arbre et séparée d'un logement (30) par un petit espace (29) frontal à travers lequel un flux de gaz est poussé au moyen d'un dispositif d'étranglement (31) de flux situé au niveau de l'entrée de l'espace. Le dispositif d'étranglement coopère avec ladite surface (26) afin de délimiter une entrée d'espace en fonction de la position et/ou du déplacement axial de l'arbre. Une chambre (33), délimitée en aval du dispositif d'étranglement et possédant un passage (35) de sortie, s'ouvre au niveau de sa portion supérieure (34) de manière à faire face à la surface de poussée, la pression du gaz dans cette chambre exerçant une poussée axiale sur l'arbre. La vibration axiale de l'arbre module l'alimentation en gaz dudit espace, et la chambre est dimensionée de sorte qu'une avance de phase de 90° de la pression instantanée soit créée dans cette dernière ainsi qu'une poussée axiale sur l'arbre, ce qui a pour effet d'amortir les vibrations de ce dernier lesquelles provoquent son déplacement.
Also published as
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