US2375395A - Compressor with opposed pistons - Google Patents

Description

May 8, 1945. E. lWAEBER Y V2,375,395

COMPRESSOR WITH OPPOSED PISTONS l Filed Dec. 30, 1941 2 Sheets-Sheet u l /1-7 il| y COMPRESSOR WITH OPPOSED PISTOS `Filed Dec. 30, 1941 ZVShee'tS-Sheet 2 pff ' n U lNvE Ton Enf/7 ader BY v AT'roRNEY Patented May 8, 1945 COMPRESSOR WITH OPPOSED PISTON S Erwin Waeber, Winterthur, Switzerland,.assign` or to Sulzer Frres, Socit Anonyme, Winterthur, Switzerland Application December 30, 1941, Serial No. 424,861 'i In Switzerland June 13, 1941 j 3 Claims.

The invention relates to a compressor with opposed pistons, particularly a scavenging pump or a charging compressorfor two-stroke opposed-` piston internal combustion engines. Y The invention provides' each piston with a central guide means at the end facing its opposed piston and a partition separating the adjacent working lspaces of the two opposed' pistons and having one column on each of its opposite faces which engages the central guide means of the pistons.

Preferably `the adjacent working spaces of two opposed pistons are separated from each other by, a partition which is fitted on each Aface with vpiston may project within the trunk piston extension. Under certain circumstances also the partition may be formed with perforations so 'that the working spaces of the two pistons are connected to each other. The partition may ybe used as a displacer so thatthe clearance may be reducedto a minimum. l

The accompanying drawings illustrate embodi 'ments of the invention, in which:

Fig. 1 shows acompressor according to the invention. Fig. 2 shows a detail of the compressor to a larger scale,

but also make a tightjoint. between working -spaces I and II.

In the compressor cylindertwall I the pistons 2 and 3 are moved in opposite directions by the cranks 4 and 5. The medium to be compressed then flows from the suction space 6 through the u suction valves 1 into the cylinder andafter being compressed passes through the delivery valves 8 into the pressure space 9. I

Between the adjacent working spaces I0 I I is the partition I2, which possesses columns .I3 and I4 respectively on the two facesV for guiding the pistons 2 and 3. The partition is formed of two disks which are held together by the bolts I5. In the groove I6 (Figs. 1 and 2) of the cylinder wall, the rings I1, made in severalpartsand slightly curved, are inserted without any gaps. When the' two disks are drawn together, these and The pistons 2 vand 3 are each fitted with a trunk piston extension I8 andy I9 respectively at the end away from the partition, and this, together with the column, on which the piston slides, serves to guide the piston; it has a bolt for the Iconnecting rodI between` the pistons andv the crank. vIn this way aparticularly compact form of construction is obtained, since the columns I3 and I4 project into the trunk piston extensions I8 and I9 respectively.

The partition is o i such a shape that it is simultaneously usedl to act as. a displacer, 'since clearance is reduced to a mnimumand the comv pressed air can with certainty flow away unhindered through the delivery valves.

The described form of construction makes it possible to provide a guide at both ends of a` piston, whereby the necessary clearance can be reducedv to a minimum. The lpartition can also i be inserted without division of the cylinder. The running surfaces of the two pistons can be Inachined in one o-peration.

The rings serving to maintain the partition in place in the cylinder maybe cut only at one place and be lof flexible composition. It is, however, also possible to divide the ring'into several segments which may then be inserted in the groove in the cylinder wall without any gaps. ticular when the ring is in several parts acompletely gas-tight partition can be provided to separate the two adjacent working spaces,4

The inventionlmay be adopted in allpossible kinds of compressors, in particular, however, in

the scavenging pumps and charging compressors of two-stroke opposed-pistoninternal combustion engines. i

I claim:

1. A compressor comprisingr at least one cylin-y der, a `partition dividing the lcylinder into two working spaces, opposed pistons reciprocating, re-

' spectively, in said spaces, means connecting the partition to the cylinder wall, a column extending from the partition into each working space, and a trunk piston extension iitting to each piston, each column being arranged to enter a trunk piston extension and guide thepistn.

2. A compressor according to claim 1 in which` the wall of the cylinder is provided with an annular groove and in which the partition is provided with an annular groove which cooperates rings are deformed in such a way that they not I with the annular groove in the cylinder wall, ring means in the annular grooves for securing the partition to the cylinder wall, and means vpressfi In paring the ring means into tight engagement with ythe cylinder wall and -thepartition forming a tight joint. i

3. A compressor according to claim 1 in which y the partition is formed of two discs, means connecting the two discs together; ythe two discs forming an annular disc between them, the cylinder wall having an annular groove cooperating said curved vrings being pressed into tight engagement with the partition discs and with the cylinder wall when the discs are held together by the

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