Importance

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Abstract

An oscillating pump (10) includes a housing (11) which carries the components thereof. These components include an electromagnetic coil (24) surrounding an armature (23) carried by an impeller (12) which is positioned longitudinally between an inlet area (16) and an outlet area (17) of the pump (10). The armature (23) moves longitudinally upon activation of the coil (24). The impeller (12) includes a pair of bellows (19, 20) and carries a valve (13). The bellows (19, 20) define an inlet chamber (21) and a discharge chamber (22). Another valve (15) is carried by the housing adjacent to the discharge chamber (22). A cup (25) is formed at the inlet end of the impeller (12) and includes a lip (26) defining shoulders (28, 29). The housing (11) is also provided with areas defining shoulders (32, 33). A spring (34) is floatably positioned between the shoulders (28, 33) and another spring (35) is floatingly positioned between the shoulders (29, 32). Upon activation of the coil (24), the valve (13) forces fluid in the discharge chamber (22) through the valve (15) and allows fluid to pass from the inlet chamber (21) to the discharge chamber (22). The return force to move armature (23) in the opposite longitudinal direction is provided primarily by the spring (35) and the springs (34, 35) compensate for any misalignment of the components of the pump (10) during the operation thereof.

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First Claim