Patent ID: 8876506
Filing Date: 2014-11-04
Classification: F04C

Abstract:
1. A dry-compressing dual-shaft rotary displacement screw spindle pump machine for delivering and compressing gaseous delivery media, comprising: a pump housing, a contactless and counter-rotating multi-stage screw spindle rotor pair within the pump housing comprising an intermeshing primary delivery thread and an intermeshing secondary delivery thread, an internal rotor cooling system operating with a coolant for said screw spindle rotor pair, and a gas inlet and a gas outlet collector space for the delivery media, wherein said gas outlet collector space is located between the primary and secondary delivery threads, wherein an outer tip circle diameter of the primary delivery thread decreases in a direction from the gas inlet toward the gas outlet collector space, a root circle diameter of the primary thread correspondingly increases in the direction from the gas inlet toward the gas outlet collector space, and a nominal delivery direction of the secondary delivery thread is in a direction opposite a nominal delivery direction of the primary delivery thread.