Patent ID: 9151292
Filing Date: 2015-10-06
Classification: F04B,F04C,Y10T

Abstract:
1. A screw compressor, comprising: a. a housing structure having an inner casing with a flow suction port, a flow discharge port, and a compressor chamber there-between; b. two parallel multi-helical-lobe rotors rotatably mounted on two parallel rotor shafts respectively inside said compressor chamber for propelling flow from said suction port to said discharge port in a flow direction; and c. a shunt pulsation trap apparatus comprising an outer casing oversized and surrounding said inner casing to cooperatively form a pulsation trap chamber therebetween, at least one pulsation dampening device positioned within the pulsation trap chamber, at least one trap inlet branching off from said compressor chamber before said flow discharge port in said flow direction and connecting said compressor chamber to said pulsation trap chamber so that at least a portion of said compressor chamber and said pulsation trap chamber are arranged in parallel, and at least one trap outlet connecting said pulsation trap chamber to said compressor discharge port; wherein said screw compressor is capable of achieving high gas pulsation and NVH reduction at said pulsation trap chamber and improving compressor off-design efficiency.