SCROLL REFRIGERATION COMPRESSOR

摘要

The invention relates to a scroll refrigeration compressor including: a sealed casing; stationary (7) and moving (10) volutes comprising scrolls inserted into one another and defining variable-volume compression chambers (13); a delivery chamber (24) defined by the plate (8) of the stationary volute (7) and the sealed casing; a heat shield (32) disposed in the delivery chamber, dividing the chamber into (i) a first volume (33a) defined by the plate of the stationary volute and the heat shield and (ii) a second volume (33b) defined by the heat shield and the sealed casing; and at least one bypass passage (34) arranged to communicate the first and second volumes. The compressor also includes: at least one bypass passage (35) arranged to communicate the first volume (33a) with an intermediate compression chamber (13b), and at least one bypass valve (36) which is disposed in the first volume and which can move between positions for sealing and opening a corresponding bypass passage (35).