Patent ID: 8147214
Filing Date: 2012-04-03
Classification: F04B

Abstract:
1. A compressor, comprising: a cylinder block including a center through-hole and cylinder bores provided around the center through-hole; a partition plate which is jointed to a top-dead-center-side surface of the cylinder block, and which includes intake holes and exhaust holes; an intake chamber and an exhaust chamber communicating with each of the cylinder bores wherein the partition plate is interposed between the intake chamber and the cylinder bores and the exhaust chamber and the cylinder bores; a crank chamber communicating with the cylinder bores in bottom-dead-center sides of the cylinder bores; pistons reciprocatably arranged in the respective cylinder bores; a driving shaft pivotally supported by the center through-hole in the cylinder block, wherein a radial bearing and a thrust bearing are interposed between the driving shaft and the cylinder block; a conversion mechanism for converting rotations of the driving shaft to reciprocating motions of each of the pistons; and an air bleed passage allowing the crank chamber and the intake chamber to communicate with each other, wherein the center through-hole in the cylinder block includes: wherein the air bleed passage includes: wherein coolant gas flows from the crank chamber to the intake chamber through the air bleed passage such that most of the coolant gas flows from the first space to the second space through the communicating part.