Questions regarding the classification of reciprocating compressors

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This post was last edited by majing*an on 2010-9-14 16:39. Classified by structure, reciprocating compressors in the horizontal type include opposed-type and symmetrically balanced-type ones. The specific definition is as follows: (Refer to the volumetric compressor technical manual) Opposed-type: A horizontal compressor in which the centerlines of all cylinders are parallel to the horizontal plane; cylinders and driving components are distributed on both sides of the crankshaft centerline, and the pistons on both sides move in the same direction at the same speed or in asymmetric motions. Symmetric balance type: The centerlines of the cylinders are all parallel to the horizontal plane; the number of cylinders in each row is even. Cylinders and driving components are distributed on both sides of the crankshaft centerline, with the cranks of opposite rows being 180 degrees out of phase from each other. It is a horizontal compressor in which the pistons move in opposite directions at equal speeds. Question: 1) In the opposing-type definition, does “the pistons on both sides move in the same direction at the same speed” refer to the adjacent pairs? How is it possible to move in the same direction? What is the crank angle deviation? 2) If each column has an independent crank, that is, it is not a structure where two columns share a crank, then by definition, it can be designed as either an opposed type or a symmetrically balanced type? 3) For the symmetrically balanced type, if there are 6 columns, then there are 3 pairs of columns, each pair being 180 degrees apart from one another. What is the angle between these 3 pairs? Should they be spaced at 90 degrees or at 60 degrees to each other?