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(11)    Patent No :    AP 1988   
(21)    Application No :    AP/P/2005/003267   
(22)    Filing Date :    07.02.2005   
(24)    Date of Grant &    07.04.2009   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
ZA    2004/1148    12.02.2004

(84)    Designated State

BW    GH   NA   TZ   ZM   ZW

(73) Applicant(s)

WEIR MINERALS AFRICA (PROPRIETARY) LIMITED, 31

Isando Road, Isando, Gauteng,
South Africa


(72) Inventors

GELDENHUYS Siegfried, South Africa

(74) Representative

HONEY & BLANCKENBERG
 
(51)  International  Classification   F04D 29/08 (2006.01)    F04D 29/42 (2006.01)
F16J 15/10 (2006.01)    F16J 15/18 (2006.01)

(54)    Title

Sealing between components of a rotary machine

(57)    Abstract

In a casing of a rotary machine, cast components are sealingly mounted together by means of seals accommodated in (semi-) enclosed cavities. A ring

seal includes an annular base and an annular skirt extending axially from the base. To ameliorate manufacturing tolerances, the seal defines circumferentially spaced, intermittent cavities to allow seal material to be deformed into the cavities as required. Land areas between cavities have cross-sectional surfaces increasing progressively from a free surface of small area to cause compressive force required for deformation to increase exponentially with an exponent larger than 1. The cavities may be peripherally

spaced, being open at a radially outer surface of the seal. The seal may be of elastic material which may be incompressible. The skirt may taper away from

(56)    Documents Cited :    US 2 252 240 A   GB 2 142 106 A

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