US1746104A - Steam-distribution system for woolf's piston compound engines - Google Patents

Description

Feb.v4, 1930. R. CHRISTIANSEN STEAI DISTRIBUTION SYSTEM FOR WOOLF'S PISTON COMPOUND ENGINES Filed Oct. 23. 1926 tion systems the present invention differs in- Patented Feb, 4, 1 93 I f ROBERT cnRIsTIANsEN, or nAnniinm-on-rn a ntnnl GERMANY srnAm-prsmninurron SYSTEM non woofiEsrisron doirronivn nNI-mis f Application filed October 23,1926, Serial No. 143,641,"andlir Germaiiy ilecenib er '21, 1925.

The inventionrelates "to a special kind of valve gear orsteam distribution for such piston compound engines which operate With-,-

v out a receiver in such manner that at a crank 5 displacement of 180 or 360 the working steam is conveyed directly from the high pressure cylinder out through the distributing 1 valve into the low pressure cylinder (Woolfs I to escape the length of the piston being some- ;what less than its stroke. The rest of the steam'distribution is carried out by valves. The arrangement is such, that the total amount of steam distribution will be-alloted to the valve and to theoutlet slots oropenings in such waythat by thelatter one portion of the steam exhaust escapes directly from'the low pressure'cylindenwhile all the other steam distribution, that isvadmissionf and exhaust of the highpressure cylinder, the inlet into the low pressure cylinder and the remaining portion ofthe exhaust from the low pressure cylinder is carried out or .gov

erned by a single valve and only one passage at each end of one cylinder, which passage also serves for admission ofthe steam. I This valve eventually is influenced by the regulation or thereversing respectively. I

Engines in which the inlet and outlet for the high pressure cylinder as well as for the low pressure cylinder are governed by a common valve, it is true, are known, however, from the known valve gears or steam distribuasmuch as bythe latter only one portion of theexhaust steam flows back by thepassage into the valve casing. By thus dividing up the exhaust steam ofthe low pressure cylinder the advantage is gainedthat thevalve and the passages need only be constructed for steam at a pressure when leaving the high pressure cylinderand thus the dimensions of suchcon-.

structional members need only besmall.

In engines fitted with the new distribution reciprocating piston except shortly before it arrives at its end position for allowing steam chambers K and the passages L (left-hand ffMoreover engines are known, inlwhich the reduction 'oficompres'sion' necessary for low pressureqcompound engine cylinders having I an outlet slot issec'ured'by providingthe cylinder, with a plurality of outlet'ports: Over engines the engine of the present 7 v invention has the 'ad'vantagefthat' the castings l are inuchless complicated, an dthereforecan be manufactured with considerable less 7 cost, and moijeoverthat the largenoxious' surfaces of the" known engines that cause losses of heat are ide -f 1 1 f QW l g 150 t v ryi fl l .fi n tr l of o theone-valve -e'ngine according to the pres ent invention a mini'rnum of'noxioussurfaces and ldead'jspa'ces' results, and also owing to the favorabledimensions of the exhaust ports s. bmpared wi h. heQ herfm s, gines constructed inaccordance'withtheinvention v V operatejon a; very small consumption of steam In, the drawing; a; diagrammatic al section of an" engine constructed according to the invention is shown, the valve being construct edby way of'exampl'e as a piston valve with I inner steam inlet.

A is the high pressure cylinder, B the high pressure piston, C thelow pressure cylinder, D the low pressure piston, F the valve casing, G the valve having two chambers K. At H the steam enters from the boiler into themiddle chamber of the valve casing F. The passages J connect the high pressure cylinder with the valve casing F, and the way of the passages J into the high pressure 6 I cylinder (right-hand side of the drawing), and the conveyance from the high pressure cylinder into the low pressure cylinder is effected by way of the passages J, the valve o side of the drawing). The steam outlet or' exhausqis governed from the low pressure a cylinder to. one portion by the slots Eand to another portion .by the passages L, the valve chambers K and the passages M (right-hand,

side of the drawing). Thus the high pressure cylinder works with contra-flow of the steam, the low pressure partly with a unaflow and partly with a contra-flow.

I claim 1. A steam distribution system for compound engines comprising high and. low pres sure cylinders, pistons in said cylinders, a valve casing comprising a high pressure inlet port, one port at each end of the high pressure cylinder, one port at each end of the lowpressure cylinder, and an exhaust port at each end of the casing, and a single valve in said casing controlling communication of said high pressure inlet port with each of said high pressure cylinder ports, of each of said highipressure cylinder ports with a corresponding low pressure cylinder port, and of each low pressurecylinder port with a corresponding exhaust port. i 7

2.7 A steam distribution system for comound en ines com risin hi h and low resv C sure cylinders, pistons insaid cylinders, central piston-controlled outlet portswin said low pressure cylinder a valve casing comprising ahigh pressure inlet port, one port at each end of the high pressure cylinder, one

port at each end of the. low pressure cylinder,

and an exhaust port at each end ofthe casing, and a single valve in said casing controlling communication of said high pressure inlet port with each of said high pressure cylinder ports, of each ofsaid high pressure cylinder ports with a corresponding lowpressure cylinder port, and of each low pressure cylinder port with a corresponding exhaust port.

In testimony whereof I have signed my name to this specification. I

ROBERT CHRISTIANSEN.

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