Diaphragm pump having a reed valve barrier to hydraulic shock in the pressurizing fluid
AssigneeGraco Inc.
InventorWilliam Duncan Vork
Life of this patent
Estimating the term…
Abstract
Apparatus for an improved diaphragm pump wherein hydraulic shock and mechanical wear to the diaphragm membrane is reduced by providing a circular reed valve member adjacent to the diaphragm. The reed valve member provides a barrier to pressurized hydraulic fluid jets from direct impingement upon the diaphragm membrane, and provides a valve closure member for reducing hydraulic shock effects on the diaphragm membrane.
Claims13
An improvement in diaphragm pumps of the type having a mechanically reciprocating member for pressurizing hydraulic oil for reciprocating a diaphragm member to transfer fluid through inlet and outlet valves into and out of a pumping chamber adjacent a first side of the diaphragm, comprising:
- a. a hydraulic chamber of containing hydraulic oil in fluid contact with said mechanically reciprocating member;
- b. a diaphragm chamber adjacent a second side of said diaphragm and having a narrowed aperture opening into said hydraulic chamber;
- c. a mechanical stop member connected to said diaphragm and sized to fit into said narrowed aperture opening;
- and
- d. a flexible reed valve member secured between said diaphragm and said mechanical stop member, said flexible reed valve member being sized to contact said diaphragm chamber in fluid flow sealing relationship between said diaphragm chamber and said narrowed aperture when said mechanical stop member is in said narrowed aperture opening, and to deflect pressurized hydraulic fluid from direct impingement on said diaphragm when said mechanical stop member moves away from said narrowed aperture opening.
In a diaphragm pump having a reciprocating member for hydraulically actuating a diaphragm member for pumping fluid into and out of a pumping chamber through inlet and outlet valves, the improvement comprising:
- a. a diaphragm chamber adjacent the diaphragm for containing hydraulic fluid, said diaphragm chamber having a narrowing contour to an inlet sized smaller than the diaphragm;
- b. a recessed shoulder in said inlet;
- c. an elongated stem attached to said diaphragm and passing through said inlet;
- d. a flexible reed valve member attached adjacent said diaphragm on said stem, said flexible reed valve member being sized smaller than said diaphragm and larger than said inlet;
- and
- e. a mechanical stop member attached to said stem adjacent said flexible reed valve member, said stop member being sized to fit into said inlet and seat against said recessed shoulder, whereby the unseating of said stop member creates an annular clearance for the flow of pressurized hydraulic fluid which impinges upon said flexible reed valve member.
Dependencies are inferred from the claim text.