RU95106829A - Screw machine gearing - Google Patents

Abstract

FIELD: mechanical engineering; compressors. SUBSTANCE: screw machine gearing has tooth profile in end face section asymmetrical relative to straight line passing through tooth point and center of rotor rotation. Rotor with lesser number of starts at low pressure side from circumference of projections to pitch circle is formed by conjugating sections of curve described by power function and arcs of circumferences of larger and smaller radii arranged successively from point of tooth to its base. Center of arc of larger radius is displaced from straight line connecting center of screw with point of tooth towards high pressure side. Sections of rotor with greater number of starts are enveloping ones relative to corresponding sections of rotor with lesser number of starts. EFFECT: increased economy and load capacity of screw machine owing to decreasing relative length of line of action of screws, increasing length of throttling path over rotor tooth point with lesser number of starts and increasing pressure angle on profile at low pressure side.

Claims (1)

The invention relates to a compressor technique and allows to increase the efficiency and load capacity of a screw machine by reducing the relative length of the contact line of the screws, increasing the length of the throttling path along the top of the rotor tooth with fewer strokes and increasing the pressure angle on the profile from the low pressure side. The gearing of the screw machine in the end section has a tooth profile asymmetric with respect to a straight line passing through the top of the tooth and the center of rotation of the rotor. A rotor with a smaller number of approaches from the low pressure side from the circumference of the protrusions to the initial circumference is formed by adjacent sections located from the top of the tooth to its base: a curve described by a power function and arcs of circles of larger and smaller radii, and the center of the arc of a larger radius is offset from the straight line connecting center of the screw with the top of the tooth, in the direction of high pressure. The rotor sections with a large number of calls are envelopes of the corresponding rotor sections with a smaller number of calls.