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Diaphragm pump

  • US 5,458,468 A
  • Filed: 03/25/1994
  • Issued: 10/17/1995
  • Est. Priority Date: 12/29/1988
  • Status: Expired due to Fees
First Claim
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1. A pump comprising a housing, a base, a flexible diaphragm between the housing and the base, with the diaphragm and the base defining a driving chamber and the diaphragm and the housing defining a pump chamber, an inlet to the pump chamber, an outlet from the pump chamber, a port in the driving chamber for coupling the driving chamber to a pump driver adapted to direct fluid to and from the driving chamber to drive the diaphragm, the pump chamber being of generally conical form and having a central axis with the outlet being located on and extending in the direction of the central axis at the apex of the conical pump chamber and the inlet being disposed at an angle inclined to the plane of the base of the conical pump chamber and being generally tangential to the outer portion of the base of the pump chamber such that flow through the pump chamber is in the form of a continuous spiral vortex in which(i) fluid drawn into the pump chamber by movement of the diaphragm away from the outlet enters the chamber in a downward direction that is tangential to existing flow of fluid in the chamber and flows in a circular path around the periphery of the base of the pump chamber to provide washout at the junction of the diaphragm and pump chamber with the circular cross-section of the pump chamber ensuring circular movement of the fluid, and(ii) as the diaphragm is moved towards the outlet, the fluid is constrained by fluid continuity, conservation of momentum and the conical shape of the pump chamber to form a converging helix which advances towards the apex of the conical pump chamber to be discharged through the outlet in the direction of the central axis of the pump chamber.

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