Patent ID: 6206668
Filing Date: 2001-03-27
Classification: F01C

Abstract:
A fluid machine, comprising:a pair of rotors formed with a concave portion and a convex portion in such a manner as to extend to an axial direction, the pair of rotors meshed with each other at the concave portion and the convex portion; anda casing having a rotor chamber formed with a first pair of cylindrical portions enveloping each of the rotors, the casing having a flow inlet port and a flow outlet port for a fluid formed in the casing at a position substantially perpendicular to the axial direction of each of the rotors, the flow inlet port and the flow outlet port disposed inside two lines Y1 and Y2 which are perpendicular to a line X connecting centers of both of the cylindrical portions and pass through the center of each of the cylindrical portions, wherein,the rotor chamber is formed with a second pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a second rotation track of each of the rotors, together with the first pair of cylindrical portions including a horizontal cross sectional shape which is constituted by a part of a circle corresponding to a first rotation track of each of the rotors, andwherein the second pair of cylindrical portions are moved toward a lower pressure end among the flow inlet port and the flow outlet port from a position of the first pair of cylindrical portions at a predetermined distance L, thereby the volume of the rotor chamber is expanded, anda first component (x) of the predetermined distance in a direction of the vertical line (X) is set to he ""x"", a relation 0.05 (mm).ltoreq.x.ltoreq.0.3 (mm) is made and a second component (y1, y2) of the predetermined distance in a direction perpendicular to the vertical line (X) is set to be ""y1"" or ""y2"", a relation 0.05 (mm).ltoreq.y1, y2.ltoreq.0.3 (mm) is made.