Rigidly attached to each other, circular rotors 1 and 2 rotate about eccentrically located fixed axis A, coinciding with the geometric axis of housing 5. Rotors 1 and 2 are encircled by split collars 3 and 4 whose rounded ends a and b slide along fixed partition d of housing 5. When rotors 1 and 2 rotate, collars 3 and 4 slide along internal surfaces e and f of housing 5 and deliver liquid in the direction of the arrows. The chamber inside surface e of the housing is connected by channels (not shown) with the input and discharge channels.
$3831$LHP,RP$