A dynamically balanced three-screw pump rotor assembly and three-screw pump

Abstract

This utility model discloses a dynamic pressure balanced three-screw pump rotor assembly and a three-screw pump, belonging to the field of screw pump technology. It includes a driving screw and two driven screws meshing on both sides of the driving screw. A first oil return channel connecting a high-pressure chamber and a low-pressure chamber is axially arranged within the driving screw. An oil return valve connected to the first oil return channel is provided on the driving screw located on the low-pressure chamber side. A second oil return channel connecting the high-pressure chamber and the low-pressure chamber is axially arranged within the driven screws. A support member is provided at the end of the driven screw located on the low-pressure chamber side. The support member includes a base plate at the end of the driven screw and a plug-in post on the upper surface of the base plate. The plug-in post is inserted into the second oil return channel. A thrust buckle is provided at the upper end of the driven screw. This utility model solves the scraping problem caused by axial movement of the driven screw, improves the reliability of the pump unit, reduces unit vibration and noise, and is suitable for three-screw pumps with high vibration and noise reduction requirements.

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