Patent ID: 7108494

Claim:
An apparatus for preventing backflow of a gas of a scroll compressor comprising: a hermetic container provided with a discharge pipe through which a gas is discharged; a fixed scroll fixedly coupled in the hermetic container; an orbiting scroll orbiting in interlocking with the fixed scroll to compress gas together with the fixed scroll; and a backflow preventing means for preventing backflow of a gas discharged through the discharge pipe; wherein the backflow preventing means comprises: a valve housing having an inner passage of a predetermined shape and fixedly coupled inside the hermetic container with its inner passage communicating with the discharge pipe; a check valve movably inserted in the valve housing, for opening or closing the inner passage by a pressure differential; wherein the valve housing comprises: a cylindrical portion formed as a cylindrical shape with certain length and inner diameter and coupled to an inner wall of the hermetic container at its one side; a covering portion for covering one side of the cylindrical portion; and a penetration hole penetratingly formed at the covering portion and opened or closed by the check valve; and a guide protrusion portion having certain height and length is formed at an inner circumferential surface of the cylindrical portion.