| 摘要 |
<p>compressor having one or more cylinders (12), pistons (30) mounted for reciprocation in the cylinders (12), cylinder head (14) means mounted over the ends of the cylinders (12) to provide discharge chambers (26), refrigerant discharge valve elements (18) intermediate the head means (14) and cylinders (12) and providing compression chambers (28) and adapted to open discharge passages (24) to the discharge chambers (26) for pressurized gas on the compression strokes of the pistons (30) and to close the discharge passages (24) on the suction strokes of the pistons (30), first suction gas inlet passages through the walls of the cylinders (12) at positions remote from the cylinder head means (14), second suction gas inlet passage (50) in the pistons (30) extending through the outer walls thereof and in communication with the first passages over at least substantial portions of the travels of the pistons (30), suction gas ports (52,54) in the tops of the pistons (30) in communication with the second passages (50), the ports having port seats (34) defining apertures through the tops of the pistons (30), and valve discs (56) mounted in the upper portions of the pistons (30) for limited axial, floating movement and having sealing surfaces or disc seats (72) adapted to bear against the port seats (54) on the compression strokes of the pistons (30) to close off the second passages (50) from the compression chambers (28), the floating movement being sufficient for movement of the disc seats (72) away from the port seats (54) to provide the suction gas ports (52,54) with suitable open dimensions to allow adequate low-pressure refrigerant gas glow into the compression chambers (28) during the suction stroke of the pistons (30). <IMAGE></p> |
