Lifting piston pump for e.g. dosage of fuel to heating system of vehicle, has movable tubular armature partially and axially movable with part of length of armature on fixed bar and dynamically sealingly supported with respect to bar

摘要

The pump (1) has an electromagnetic drive comprising two displacement chambers (10, 11) whose volume is changed when a movable tubular armature (7) is moved under an effect of magnetic force and force of a return spring (9). A valve arrangement connects the chambers with each other. A non-return valve connects an inlet (18) with one chamber. Another non-return valve (12) connects another chamber with an outlet (17). The armature is partially and axially movable with a part of length of the armature on a fixed bar (15) and dynamically sealingly supported with respect to the fixed bar.