Patent ID: 6109889
Filing Date: 2000-08-29
Classification: F04B

Abstract:
A fluid pump comprising: a substantially flat, plate-shaped pump body having an outlet opening and an inlet opening formed therethrough in parallel and adjacent to each other, wherein the outlet opening is arranged on center of said pump body, neither said inlet opening nor said outlet opening being provided with a check valve; a plate-shaped displacer connected circumferentially to said pump body such that a pump chamber is defined therebetween, said pump chamber being substantially symmetrical with respect to said outlet opening; drive means for positioning the displacer periodically at a first and at a second position, said drive means having a motive element, said motive element having first and second ends respectively, the first end being attached to the center of the displacer, the second end being attached to a wall of the pump body; the displacer closing said outlet opening when it occupies its first end position and leaving said outlet opening free when it occupies its second end position and leaving the inlet opening free at both end positions thereof, said displacer, when moving from the first to the second end position, defining a flow-through gap which opens between the displacer and the pump body in the area of the outlet opening in dependence upon said movement, said flow-through gap being defined such that the flow through the outlet opening depends on the pressure in the pump chamber as well as on the respective opening degree of said flow-through gap.