Scroll refrigeration compressor with improved retaining means and bypass valves

摘要

The scroll compressor includes stationary and moving volutes each including a scroll plate provided with a spiral wrap, the spiral wraps defining the variable-volume compression chambers, a delivery conduit including a first end emerging in a central compression chamber and a second end designed to be communicated with a delivery chamber, a delivery valve movable between closing and opening positions for closing and opening at least one delivery opening arranged to communicate the delivery conduit and the delivery chamber, at least one bypass valve associated with a bypass passage arranged to communicate the delivery chamber with an intermediate compression chamber. The compressor includes a retaining plate mounted on the scroll plate of the stationary scroll and on which first and second retaining elements are formed, the latter being arranged to limit respectively the amplitude of movement of the delivery valve and of each bypass valve toward the opening position thereof.

主权项

1. A scroll refrigeration compressor comprising:
a sealed casing containing a stationary scroll and a moving scroll following an orbital movement, each scroll including a scroll plate from which a spiral wrap extends, the spiral wraps of the stationary and moving scrolls being engaged in one another and defining variable-volume compression chambers, a delivery conduit, formed in a central portion of the scroll plate of the stationary scroll, comprising a first end emerging in a central compression chamber and a second end configured to be communicated with a delivery chamber at least partially defined by the sealed casing, a valve arrangement mounted on the scroll plate of stationary scroll at the second end of the delivery conduit, the valve arrangement comprising:
at least one delivery opening arranged to communicate the delivery conduit and the delivery chamber,a delivery valve movable between closing and opening positions for closing and opening the at least one delivery opening, the delivery valve being configured to be moved into the opening position when the pressure in the delivery conduit exceeds the pressure in the delivery chamber by a predetermined value,first retaining element configured to limit the amplitude of movement of the delivery valve toward the opening position, at least one bypass passage arranged to communicate the delivery chamber with an intermediate compression chamber, at least one bypass valve associated with a bypass passage, each bypass valve associated with a bypass passage 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 the pressure in the intermediate compression chamber in which the corresponding bypass passage emerges exceeds the pressure in the delivery chamber by predetermined value, second retaining element configured to limit the amplitude of movement of each bypass valve toward the opening position, wherein the compressor includes a retaining plate mounted on the scroll plate of the stationary scroll and on which the first and second retaining elements are formed, and the second retaining element includes at least one recess formed on a surface of the retaining plate turned toward the scroll plate of the stationary scroll, each recess being at least partially defined by a bottom wall forming an abutment surface arranged to limit the amplitude of movement of the associated bypass valve toward the opening position.