Abstract: A compression element located inside an enclosed compressor is disclosed for receiving a connection pipe from outside the compressor. The compressor has an opening one in one of its walls. The compression element has a bore running through it. An inlet end of the compression element is joined to the wall of the compressor at the opening. The inlet end of said bore is tapered in the form of a curved shape that spreads smoothly toward the opening. A guide pipe has one of its ends installed into the opening from outside the compressor. A connection pipe having a cooper plated exterior surface is inserted through the guide pipe, press-fitted into the inlet end of the compression element and joined to the compression element. The connection pipe has another end connected to a suction pipe for circulating a refrigerant within the compressor via the compression element.

Abstract: A check valve device is provided for a scroll compressor in which a crescent-shaped compression chamber is defined by a fixed scroll and an orbiting scroll, the orbiting scroll being driven to compress gas introduced into the compression chamber such that the compressed gas is discharged out of a discharge port provided in the vicinity of a center of the fixed scroll. The check valve device includes a check valve having a disk for closing the discharge port, a ring concentric with the disk and a plurality of beams coupling the disk and the ring, a tube receiving the check valve and which is provided at the discharge port of the fixed scroll, and a valve retainer for retaining the check valve. The valve retainer is provided at an outlet portion of the tube so as to confront the ring of the check valve.

Abstract: A scroll blade of a scroll fluid machine is formed of eutectic graphite cast iron in whose structure the average value of the largest eutectic shell is not more than one fourth of the height of a lap of the scroll blade. The scroll blade material thus formed will facilitate increasing working precision and reducing the number of working steps.