Fuel injection pumping apparatus
Pumping by wire elongation
Diaphragm air pump assembly
Pumping by martensitic transformation utilization
Piezoelectric fluid pumping apparatus
Double action spring actuator
Piezoelectric pump assembly
ApplicationNo. 237465 filed on 01/26/1999
US Classes:417/534, Chambers formed at opposite ends of rectilinearly moving pumping member417/375, Fluid motor417/393, With additional unitary common pumping and motor working member417/473Plural bellows
ExaminersPrimary: Freay, Charles G.
Assistant: Evora, Robert Z.
Attorney, Agent or Firm
Foreign Patent References
International ClassF04B 043/06
AbstractA pump for impelling a fluid includes a first variable volume, the first variable volume having a first inlet for allowing the influx of the fluid into the first variable volume and a first outlet for allowing the efflux of the fluid out of the first variable volume and a first membrane defining at least a portion of the first variable volume. The pump also includes a first contractile actuator, for displacing the first membrane from a first position to a second position in such a manner as to vary the first variable volume and a second contractile actuator, for restoring the first membrane from the second position to the first position in such a manner as to vary the first variable volume. A first check valve is coupled to the first inlet for regulating the influx of fluid into the first variable volume through the first inlet and a second check valve is coupled to the first outlet for regulating the efflux of the fluid out of the first variable volume through the first outlet. In a preferred embodiment, at least one of the first and second contractile actuators is a linear actuator.