Patent ID: 6155803
Filing Date: 2000-12-05
Classification: F04B

Abstract:
A rodless pump assembly for pumping fluid from a fluid reservoir connected via a conduit to a operational pressure source, the rodless pump being responsive to the application of pressure on fluid within the conduit by the operational pressure source, said pump assembly comprising:a housing connected at the lower end of a conduit and positioned within a fluid to be transported through said conduit;a plunger assembly movably disposed within said housing, said assembly movable in a first direction responsive to pressure applied to fluid in said conduit for drawing fluid into said housing;a pressure chamber formed within said housing above said plunger assembly containing a substantially compressible fluid therein for moving said plunger assembly in a second direction when pressure is released from said fluid in said conduit wherein fluid from said reservoir drawn into said housing is produced into said housing; anda dampening mechanism connected to said plunger assembly wherein impact between said plunger moving in said first direction and a portion of said housing is reduced.