US1757212A - Shaft packing suitable for steam turbines - Google Patents

Description

May 6, 1930. i c. A..PARSONS-EI' AL a 1,757,212

SHAFT PACKING SUITABLE FOR STEAM TURBINES Filed April 21, 1927 Patented May. 6, 1930 l r p r ITED STATES PAT NT-foamy CHARLES ALGEBNON PARSONS Nns'rANLEY-SMITH oooK, or' 'NEWoAsTLE-oN-TYNE,

ENGLAND; sAInoooK ASSIGNOR To sAInPARsoivs SHAFT PACKING SUITABLE FOR STEAM TUBBINES Application filed April 21, 192?, Serial No. 185,629, and in GreatBritain May 12, 1926.

The invention relates to shaft packings are also connected together and toa'point'of suitable for steam turbines and particularly the low-pressure turbine, G, ata pressure to those of the kind in which a so-called slightly below atmosphere by means ofthe reservoir is connected to pockets provided piping, e. i v f v in theglands of stufiing boxes. Y The arrangement as above described is 5 In a certain constructional form of such preferred in orderto stage the pressure drop packings proposed for steam turbines, the across each gland but as'the flow in the lOW- reservoir constitutes a pipe connection bepressureturbine is necessarilyinwards from tween the gland pockets respectively of the the outer lg d iti ngtlnecessary th t it high-pressure and low-pressure turbine inner gland pockets, 0 should inall-cases c0 stages, so that leakage steam from the highbe connected to the sub-"atmospheric point. pressure turbine into the high-pressure gland Vfith like glands a hown, it will b e 7 pocket passes by Way of the reservoir to the that the resistance to fiovv in the glands of the low-pressure gland pocket. If the pressure different stages can be made identical, the

in the reservoir in such a case is adjusted corpressure in the reservoir being maintained at 65 rectly for the low-pressure gland pocket, the a i t. o ly very slightly above the atmosresulting pressure in the high-pressure gland vpflnereso th t, l ka f th te .l la d pocket, owing to the resistance of pipes of toth engine r i du d t a ligibl practicable dimensions, may be so hlgh as to ntityforeach stage andthe iloiv is incause considerable leakage Of steam lIltO the Wards for the uterglayul poeket each. unit. 70 engine room. As a oonsequenceyin addition to adding to The main object of the present invention 1S the comfort engin e eom taff, the heat to Provide improvements designed to Over in the steam is saved and also the heat necescome such difliculties. sarily expended in the-evaporator to replace With such an object the invention consists 1 t f d Waten 75 in the combination Of parts hereinafter de- The upply of steam to the reservoir 111337 scribed and particularly pointed out in the be drawn from the loyv-p essure team for the 7 claims. auxiliaries, auxiliary exhaust steam, steam The accompanying dra l g Shows (llatapped from the main turbines, or other congrammatically one form of the invention. i t Source, I so In carrying the invention into effect "The use of Wet steam for the glands is cording to this fornl ppl l a m preferred inasmuch as if the turbines are unit steam turbine havmg high-pressure, nki with superheated Steam, any 1 k termediate-pressure and low pressure unlts, a becomes veryhighly superheated by l'espectlvely Separate sage throughthe glands and is practically t gland. of labyrmth or Othel: V invisible so that it cannot be seen Whether i f the Shafts of the three; unzlts 1S the gland is Working correctly; the present Vlded Wlth gland Pockets a q foruint invention enablesall the outer pockets to be A, 52 for mm B and 011 a? for t Whlch supplied With saturated steam.

a0 ma 1 0 annu1ar for.m an i fi i If desired, the usual connections, 7, f, may

g? i at a f fijg i gf gi g; be provided fromother gland pockets, a 6

me anfou g k bino ML at pressures above atmosphere to lower presremote t er? p00 e S b i sure sta es for the purpose of sta in' the ly spaced with packlng on both sldes thereof b e c 4.3 as shown. All the outer pockets, gland toreduce leakage' are Connected by Suitable Piping; (Z150 a resale We Wish it to beunderstood that the terms i R the i i may it lf f th super-atmospherlo glands and sub-atmosreseivoir) Supplied *f Steam f any pheric glands as used in the above specifica- Suitable Source by way f th 1 t 11 d tlon and 1n the claims appendant thereto g pipe While n the inner k t Z mean that the relative glands pack against internal pressures which are respectively above and below atmospheric pressure.

The details of the invention may take other forms than those specifically described above. Having now described our invention, what we claim as new and desir'e'to secure byiLetters Patent is 1. A rotary engine comprising i'ncom b-ination a plurality of pressure stages; engine shafting; glands for said shafting in connection with each of said plurality of stages,

each gland having atyleast two axially=disposed gland pockets, an outer pocket and an inner pocket; a reservoir system at a pressure slightly above atmosphere to which all said outer gland pockets 'are connected; and a second reservoir system at a pressure below atmosphere to which all 'said inner gland pockets are connected. V 1

2. A rotary engine comprising incombination a plurality of pressure stages including a sub-atmospheric stage; engine shafting; 'glandsfor said shafting in; connection with "each of said plurality of stages, each gland having at least two axially-disposed gland pockets, an outer pocket and an inner pocket a reservoir system at a pressure slightly above atmosphere to which all said outer gland pockets are connected; and a second reservoir system to which all said inner gland pockets are connected, said second reservoir system being connected to a point of said sub-atmospheric stage. a e V In testimony whereof we have'fsigned our names to this specification.

CHARLES ALGERNON PARSONS. STANLEY SMITH 3 COOK.

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