Patent ID: 8366405

Claim:
A screw compressor comprising: a casing having a cylinder portion with an inner circumferential surface; a screw rotor rotatable about a rotor axis and being disposed in the cylinder portion to define a compression chamber with the inner circumferential surface such that fluid sucked into the compression chamber is compressed by rotation of the screw rotor; and a capacity control slide valve axially slideable along a valve axis parallel to the rotor axis and opposed to an outer circumferential surface of the screw rotor, the capacity control slide valve having a valve body with a back surface and a curved surface, the curved surface extending substantially along a curvature of the inner circumferential surface directly opposing the outer circumferential surface of the screw rotor, with a dynamic pressure generator being formed on the curved surface, and the dynamic pressure generator being configured such that the fluid in contact with a structure of the curved surface of the capacity control slide valve forms a dynamic pressure, and the dynamic pressure acts on the capacity control slide valve such that contact between the valve body and screw rotor caused by rotation of the valve body about the valve axis is avoided.