Patent ID: 9638205
Date: 2017-05-02
CPC Classifications: F04D

Claim:
1. A double seal pump assembly comprising: a) a pump housing having an inlet and an outlet; b) an impeller in communication with each of said inlet and said outlet wherein a fluid entering the inlet is pumped out of the outlet, the impeller including an integral impeller shaft extending outwardly from said housing and adapted to engage a drive shaft of a motor; c) a housing adapter mounted onto said housing at a first seal, the housing adapter configured to secure said impeller to said housing, the housing adapter including a lobe having a channel defined therein; d) a motor adapter mounted to said housing adapter at a second seal thereby defining a cavity therebetween, the motor adapter configured to mount the motor, wherein the cavity is configured to be charged with a barrier fluid through a zerk fitting; and e) an accumulator mounted onto said lobe and being in fluid communication with said cavity via said channel, the accumulator configured to hold a reserve barrier fluid, wherein the accumulator includes a piston biased to either deliver said reserve barrier fluid from said accumulator to said cavity or receive said reserve barrier fluid from said cavity to said accumulator when recharging said cavity via said zerk fitting so as to maintain barrier fluid volume and pressure within said cavity.