SCROLL COMPRESSOR

• Main Authors: MATSUKAWA, KAZUHIKO, YAMAJI, HIROYUKI
• Format: Patent
• Language: English; French; German
• Published: 21.04.2010
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTMACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENTPUMPS; WEAPONS

An object of this invention is to further suppress the flow of high-pressure fluid from the fluid introducing passage into a compression chamber for regulating a suction capacity and to suppress a power reduction of a scroll compressor under a normal operation. In a scroll compressor (1) according to this invention, a first through hole (32) which penetrates through an end plate (21a) and opens to the bottom of a spiral groove is formed in a first scroll member (21). And, a piston (33) is inserted into this first through hole. The piston is pushed against a side opposite to the compression chamber by a biasing member (35). The piston has an annular groove (33d) formed on a side surface thereof and a second through hole (33f) which opens at an end surface of a side opposite to a compression chamber side of the piston and a bottom surface of the annular groove. A piston ring (33e) having a step-like fitting end is fitted into the annular groove. And, the piston is under a condition for closing a space of the compression chamber side of the first through hole when a high pressure is applied to the piston. And, the piston is under a condition for forming a gap space of the compression chamber side of the first through hole when a low pressure is applied to the piston.