Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Scroll compressor having discharge port formed only in end plate of fixed scroll, and discharge valve attached to the end plate
 A scroll compressor comprising a discharge port as small as possible is disclosed, which requires less recompressive force and has improved operational ability. The scroll compressor comprises a casing; a fixed scroll, movable in its axial direction, provided in the housing and comprising an end plate and a spiral protrusion built on one face of the end plate; a revolving scroll provided in the casing and comprising an end plate and a spiral protrusion built on one face of the end plate, wherein the spiral protrusions of each scroll are engaged with each other so as to form a spiral compression chamber; and a back pressure block for supporting the back face of the fixed scroll. In the structure, an introduced working gas is compressed in the compression chamber and then discharged according to the revolving operation of the revolving scroll; a discharge port joining the compression chamber is formed in the end plate of the fixed scroll; the back pressure block has a ring shape, and the inner-peripheral face of the back pressure block and the back face of the fixed scroll form a high-pressure chamber; and a discharge valve for opening and closing the discharge port is attached to the end plate of the fixed scroll and is provided in the high-pressure chamber. 
Mitsubishi Heavy Industries, Ltd.
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inventional additional additional
Makoto Tetsuzou
Takeuchi Ukai