ROTARY PUMP

PURPOSE:To reduce pulsation in a captioned pump by giving pumping work to a pair of pump chambers provided in a pump casing on the basis of eccentric wheels different in their phases by 180 deg. for joining fluids discharged from these pump chambers with pulsations different in their phases by 180 deg.. CONSTITUTION:A pair of eccentric wheels 14 and 14 are fitted on a pump shaft 7 via bearings 8 and 9 to be axially separated as keeping the phase difference of 180 deg. circumferentially. A pair of diaphragms 24 are equipped on outer circumferences of these eccentric wheels 14 and 14. A pair of pump chambers P are provided between the peripheries of diaphramgs 24 and the inside of a pump casing 1. Each pump chamber P is hermetically partitioned by a partition 36 into a suction chamber Pi connected to a suction port 42 and a discharge chamber Pe connected to a discharge port 43. This construction permits to join fluids of different pulsation phases by 180 deg. discharged from a pair of pump chambers Pi and Pe by the eccentric motion of the eccentric wheel 14 for reducing pulsations greatly.