VANE-TYPE ROTARY POSITIVE-DISPLACEMENT PUMPS AND COMPRESSORS

摘要

A vane-type rotary positive-displacement pump or compressor comprising an external member cooperating with an internal member, the members being relatively rotatable about a common axis, the external member having an internal peripheral surface and the internal member having external peripheral surface, the peripheral surface of one of said members having a circular profile and the peripheral surface of the other of said member having a sinuous profile of constant diameter, the said peripheral surfaces constituting walls of an odd number of chambers evenly spaced around said common axis, said chambers being separated from each other by lines of contact between said internal and external peripheral surfaces; and vane assembly disposed along a diametral line and slidably mounted in the member having the circular profile, said vane assembly having curved vane ends in contact with the sinuous surface such that when the members rotate relative to each other the vane ends sweep the sinuous surface and the vane assembly slides reciprocably in the member having the circular profile, each vane and reciprocating with simple harmonic motion relative to this member; and inlet and outlet ducts whereby fluid can be introduced into and withdrawn from said chambers, and wherein the sinuous profile is such that the locus of the centre of curvature of each vane end satisfies the equation:(Chemical Formula Applied)where r1 represents the magnitude of a radius vector defining the position of the centre of curvature of each vane end relative to said axis and to a datum line passing through said axis and the location of said centre when the radical distance of this centre from said axis is leat and is calculated from the equation.(Chemical Formula Applied)where ( represents the phase angle of the radius vector relative to said datum line,(Chemical Formula Applied)a represents the least radial distance of said centre from said axis,b represent the radial distance from said axis to the centre, or mean position, of the simple harmonic motion of said centre, and ( represent the angle between said radius vector and the tangent to the locus of the path of said centre, and wherein the sinuous profile satisfies the equation:(Chemical Formula Applied)where r2 represents the magnitude of a radius vector defining the position relative to said axis and the datum line of a second point on a line perpendicular to said tangent and displaced from said centre by a distance equal to the radius of curvature of each vane end, ( represent the phase angle of radius vector r2 relative to the datum line, and R represents the radius of curvature of each vane end.