Split segments maximise turbine efficiency

-

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Compact ring reduces Iocalised

them.

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,,,,.< .,,+ , . , - , , + seal whcro the annulai

I'hc hight l,ortion is designed t . bc its large :is possible witln>ut

Tith_': I>ressnre enelgiscd inetallic sealing ring

engaging

l)ale: 24th March 199g

to

hiventurs: , %wenscn, M ' l i g g i n s

dulit m installaUon, u>

Assignee: l ( ( ; & ( ; lq'cssure Science

plc'+cnt any Iocaliscd

the

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27

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flange

,,-N{',-//--~-,4--25 \ [~-~\'\i\ ' ' ' \ '

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ling is ct micrl) .seal, with a n n u t e r d i a n l e t e i in

~th+h ,i, in .iilclati ~v<,icmx. l'lic' sealing iillgs are

apl'.roximatel Y 0.gG inch t,.> apprl ximatcly 4.20 inch.

p,t~cialh' t,n, I,u<., . tc u,cd
the

rangc

of"

l h c cl-ficicncv ot uubir.c dcpcnd~ ou its ability tu tnaximisc the ~.t+:+,+'c.lsi~>tl o1 ",+vc,kil;g fluid C'[ICI~)' into l'O{,lllOll O[ file lota[ill mcnl[-iCl-. Scaling devices aJu, thclel'lu, emph~ycd at;out

I}lli/i <,}lc'c'l lilt'till, i1<.' t~pTc:lilv tl%'d in aircratt ~

imcumltic duct ,,,lt'ill!;, il~(~ile]i SUCi~~eclls;ire

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prt+nc

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and

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l>luterahlv, the scaling

met,lille ~caling I I1~:, .ire' lit>/ adequate t;.+r

~clatix< I,+, ,.,n-< ,,ml, ti,u,t dct0i re.it it)l~

'//7./""1 i/ /'/11,1 ,//i/:/l!lsl//i / i//l'/l~l/~

i n w a rd l y

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kc~ hc t metallic xc.llhlT, ling <, AlC u<,ed in a wide ~+1 appiic,tti<,ns,

z/if

/

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stresses

~aiic't;

/

/

lugportiot,scngagcihe

the r<+tating mcrubct t<, ((retain the working fluid to ,+votking spaces ,,+'iithin tl;c turt~inc, l'hu

dcsclibcd iri this

[Mlcnt i,, cxticmcl) ct,mp;~ct ,lnd is ~uf}icicntlv

l'undamcnta]

resilient and dural+it tu in,iintain .1 seal bctwccn

scaling ring. A t3pical escape throug]~/his .,l,a.:,.. lhe invcntiun dcscril',cd m this patent, and shown in Figure 6. orb'is ,l ">c';ll iin~ dcsign which nlininliscs such leakage, l ' h c wal ling ,~eiltqdtcs, from the t~>talv mothm ,,t the working thlhi

Ilangc~, witll mit-c,l f]:lt suriilccs. Il+c scaling ring

i', ~+]ltl\\ I]ii+ it<> tlil!itlt_",Sct+t c
Pigtlrc

[li liiT, ulc q.

I h c ,<';lling ring (1()), inchidu <, an ,illnlllal Title: Method and apparatus for minimising l'.ight I>t)ltion (] 2), ,111CI t,+,,;<+ctllVCd lt'g poltions leakage in turbine seals ( l i , ]/,). [I is ~.,mSUtlctcd of ,i single ply of + Patent lltlli'lber: US'i73566lulativclv c<>t/stalll thicknu!;~,. \\"hen installed, the Date: 7th April 199g lill~ i> t~picatly l,,cat,.,d I+ctwccn two coaxial Inventors: W Sanders, A Mitola Assignee: hmovative Technology pipe, , I-, IN), ;tnc i, :l<,cd l<, s<'al the intcrf]lcc

IC)

CtwIIpO;IlC'R! t+i tllc~,c sc:als is tile'

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SealingTechnologyNo. 56

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] side of the sealing ring. [ The sealing ring segment comprises a - 2o baseportion (22), and a tooth portion (22), present as many ] segments, defined by discontinuities (27). ] Each segment has a trailing edge (28), relative to the fluid movement, which the fluid. The sealing ring thus provides a seal which effectively works to separate a first stage of a turbine from an a relatively lower working

ad, !

° egatt s pressure

Full copies of the original patent documents can be obtained from the following: The British Library Patent Express, 25 Southampton Buildings, London WC2A lAW, UK. Fax: +44 171 412 7930 The British Library will also supply a list of libraries included in the Patent Information Network. US Patent Office Scientific Library 15th and East Streets, N W Washington, DC 20231, USA The Japanese Patent Office 43 Kaksumigaseki 3-chome Chiyoda-ku, Tokyo 100, Japan

Webwatch EPM Inc

Manufacturers Information Net

www.epm.com

www.mfginfo.com

With at least 10% of EPM's sales leads coming cold over the Internet, this web presence, from the self-proclaimed "Seal Man", Jerry Whitlock must be doing something right. It offers a complete on-line 32 page catalogue of EPM's collection of seals, answers to the most commonly asked technical questions and is apparently even endorsed by Robert Louis Stevenson. Choose the frames set-up from the home page for an easier method of browsing "one of the largest collections of seals in the world", and decide for yourself whether this TreasureIsland of a site is a Dr Jekyll or a Mr

A menagerie of company details, articles, and information offered here for those involved in the manufacturing industry. The search engine should help you to focus your inquiry if you need specific information about services or products, or just surf through the different categories if you want to see what's available. You can also join in with the discussion group, read or contribute articles about all aspects of manufacturing, or hunt down a qualified machinist or some bargain used equipment from the classified ads. A collection with something for most seal-surfers and a great source of on-line links.

Hyde. Revolve Technologies Inc

www.revolve.com

%_ I

; ;;),;)~

"If it rotates, revolve can help" promises this site from the ....... Canadian designer and :~:: manufacturer of innovative ......................... products f-or rotating equipment, including dry gas seal systems. In addition to the clearly laid out and well explained product information, there ate sections on company news, a technical library and a corporate profile which offers details of Revolve's mission, story and people. The open invitation to submit research topics for discussion in the on-line technical forum is a neat touch, though tbe response to-date suggests the appeal of exotically-located conferences is one thing the allconquering web can't yet match.

(~)

AA Gaskets Pty Ltd

wwvv.aagaskets.com.au AA Gaskets is a wholly Australian owned, specialist automotive gasket manufacturer, and its well presented web site is dedicated to this precision application. The stages in the design, manufacture and supply of the company's products are featured, along with a comprehensive listing of new gasket types available, and the make and date of automotive engines they are intended for. Also included in the news section are the latest company announcements and feature-length articles on issues of relevance to the auto-gasket industry. Should you wish to discuss any of these further, then the photographic line-up of the management team should help you to put a face to that E-mail address.

SealingTechnologyNo.56