Patent ID: 9033689
Filing Date: 2015-05-19
Classification: F04C

Abstract:
1. A scroll refrigeration compressor comprising: a sealed casing; a stationary volute sealably fixed on the sealed casing and a moving volute following an orbital movement, each of the volutes including a plate from which a spiral wrap extends, the spiral wraps of the stationary and moving volutes being engaged in one another and defining variable-volume compression chambers; a delivery chamber defined by the plate of the stationary volute and the sealed casing; a heat shield having a plate-shape and being disposed in the delivery chamber and mounted on the plate of the stationary volute, the heat shield dividing the delivery chamber into a first volume defined by the plate of the stationary volute and the heat shield and a second volume defined by the heat shield and the sealed casing, and the heat shield including: (i) a first portion extending substantially perpendicular to a longitudinal axis of the compressor, (ii) a second portion extending from the first portion and in an inclined manner with respect to the first portion, and (iii) a third portion extending from the second portion substantially parallel to the longitudinal axis of the compressor: at least one flow passage arranged to communicate the first and second volumes, the at least one flow passage being at least partially defined by an inner wall of the sealed casing and an outer peripheral edge of the heat shield; at least one bypass passage formed in the plate of the stationary volute and arranged to communicate the first volume with an intermediate compression chamber; and at least one bypass valve that is disposed in the first volume and associated with a said at least one bypass passage, each of the at least one bypass valves being movable between closing and opening positions for closing and opening the corresponding bypass passage, and being configured to be moved into the opening position when pressure in the intermediate compression chamber in which the corresponding bypass passage emerges exceeds pressure in the delivery chamber by a predetermined value.