Patent ID: 8366414

Claim:
A solenoid diaphragm pump ( 1 ) comprising: a diaphragm ( 11 ), located inside a pump housing, a diaphragm chamber created by the diaphragm and a diaphragm cover of the pump housing, a solenoid with a movable magnetic armature ( 8 ) that acts opposite to a force of a spring to actuate the diaphragm ( 11 ) between an upper dead center position and a bottom dead center position to pump a fluid via the diaphragm chamber; and a stop element ( 9 ) for adjusting a stroke length of the armature ( 8 ), the stop element having at least one elastic damper ( 36 ) provided between the armature ( 8 ) and the stop element ( 9 ), the elastic damper ( 36 ) comprises at least one compression chamber ( 26 ), enclosed and formed by at least one elastic limiting wall; and the at least one elastic limiting wall contacts at least one stiff limiting wall of at least one of the armature ( 8 ) or the stop element ( 9 ); and as the armature moves the diaphragm to the bottom dead center position the at least one compression chamber provides a progressive damping characteristic that is independent of the force of the spring.