Patent ID: 6158992
Filing Date: 2000-12-12
Classification: F04C

Abstract:
A pump operable in suction and compression strokes, comprising:a housing with an inner periphery, said inner periphery including a trochoid curved surface;a rotor rotatably arranged in said housing, said rotor having a substantially triangular shape, said rotor including vertexes slideably contacting said trochoid curved surface of said housing, said housing and said rotor cooperating with each other to define suction working chambers and discharge working chambers;suction ports that respectively communicate with said suction working chambers when the pump proceeds to the suction stroke;first passages that respectively communicate with said suction ports, said first passages and said suction ports being always in fluid communication, said first passages being formed through said housing;a second passage that communicates with said first passages, said second passage being formed through said housing and being always in fluid communication with said first passages; anddischarge ports that respectively communicate with said discharge working chambers when the pump proceeds to the compression stroke.