Self priming pump
AssigneeITT Manufacturing Enterprises, Inc.
InventorStephen Cox
Life of this patent
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Abstract
A self-priming centrifugal pump comprises a centrifugal impeller (19) arranged in a pumping chamber (9) for transferring liquid from an inlet (5) to an outlet (7) of the chamber, a diaphragm (21) arranged downstream of the impeller for providing priming, and a drive means (25) for driving the diaphragm with reciprocating motion during priming. The diaphragm and the drive means are arranged so that a pressure increase downstream of the impeller after priming causes a change in the neutral position of the diaphragm, which then causes disengagement of the drive means. The drive means may comprises a cam and cam follower arrangement or a crank and connecting arm arrangement.
Claims4
A self-priming centrifugal pump comprising:
- a body that has chamber walls that form a cavity with an upstream pumping chamber that has an inlet and a downstream priming chamber that has an outlet;
- a centrifugal impeller lying in said upstream chamber for pumping liquid from said inlet toward said outlet;
- a diaphragm that is positioned along said downstream chamber and that is reciprocatable to repeatedly compress and expand said downstream chamber to prime the pump;
- valve means coupled to said downstream chamber for allowing fluid flow only out of said outlet when the pump is being primed;
- drive means including a mechanism for reciprocating the diaphragm during priming of the pump and for automatically not reciprocating the diaphragm in response to a pressure increase in the downstream chamber that indicates that the pump has been primed.
Dependencies are inferred from the claim text.