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Diaphragm pump

  • US 4,086,036 A
  • Filed: 05/17/1976
  • Issued: 04/25/1978
  • Est. Priority Date: 05/17/1976
  • Status: Expired due to Term
First Claim
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1. A fluid pump comprising a housing having an inlet for fluid, an outlet for fluid and a pumping chamber in communication with said inlet and outlet, inlet valve means, outlet valve means, a flexible diaphragm having an arcuate ridge formed therein, which diaphragm is clamped about its periphery between two separable sections of said housing and has one surface defining part of the boundary of said pumping chamber, said arcuate ridge being convex with respect to said pumping chamber, a connector extending from the central portion of the opposite surface of said diaphragm, means for attaching said housing to a rotary motor, and drive means for reciprocating said diaphragm to alternately draw fluid into the pumping chamber through said inlet valve means and then discharge the fluid through said outlet valve means, said drive means including an eccentric coupling for connection to the output shaft of the rotary motor plus linkage means joining said eccentric in driving relationship to said connector so that rotation of the motor shaft causes said diaphragm to be driven in a rocking, reciprocating movement, and one said housing section being formed with a curved surface portion which is a section of an annulus located on the pumping chamber side of said diaphragm and which has a radius of curvature such as to support said diaphragm during the period it is distended into the pumping chamber region and said other housing section being formed with a second curved surface portion which is a section of an annulus having a diameter substantially greater than the diameter of said first-mentioned annulus so that the regions of wear resulting from contact between each surface of said diaphragm and the respective supporting curved surface portions of said housing are radially spaced from each other.

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