Diaphragm pump
First Claim
1. A diaphragm pump apparatus of the type having a mechanically reciprocating piston for alternately compressing and relaxing a driving fluid chamber acting on one side of a diaphragm and having a pumped fluid chamber on the other side of the diaphragm, comprisinga. a sleeve slidable over said piston and having at least a portion of its first edge surface area exposed to the driving fluid chamber, and having its second edge surface positioned outside said driving fluid chamber;
- b. spring-biasing means for urging against said second edge surface and biasing said sleeve toward said driving fluid chamber;
c. a mechanical stop for limiting the movement of said sleeve toward said driving fluid chamber;
d. a driving fluid reservoir in fluid coupling contact with said piston outside said driving fluid chamber;
e. a replenishing passage through said piston and opening at a first point into said driving chamber and at a second point along said piston, whereby said second point may contact said driving fluid reservoir during a portion of said piston reciprocating stroke, and whereby said sleeve is slidable into closing relationship over said second point.
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Accused Products
Abstract
A diaphragm pump apparatus is disclosed, having a mechanically reciprocated piston driving a hydraulic fluid chamber and reciprocating a flexible diaphragm. The apparatus includes a spring-biased expansion volume connected to the hydraulic fluid chamber and a hydraulic fluid replenishing port that opens on predetermined conditions of pressure loading and piston stroke position.
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Citations
16 Claims
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1. A diaphragm pump apparatus of the type having a mechanically reciprocating piston for alternately compressing and relaxing a driving fluid chamber acting on one side of a diaphragm and having a pumped fluid chamber on the other side of the diaphragm, comprising
a. a sleeve slidable over said piston and having at least a portion of its first edge surface area exposed to the driving fluid chamber, and having its second edge surface positioned outside said driving fluid chamber; -
b. spring-biasing means for urging against said second edge surface and biasing said sleeve toward said driving fluid chamber; c. a mechanical stop for limiting the movement of said sleeve toward said driving fluid chamber; d. a driving fluid reservoir in fluid coupling contact with said piston outside said driving fluid chamber; e. a replenishing passage through said piston and opening at a first point into said driving chamber and at a second point along said piston, whereby said second point may contact said driving fluid reservoir during a portion of said piston reciprocating stroke, and whereby said sleeve is slidable into closing relationship over said second point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A diaphragm pump pressure relief apparatus for preventing hydraulic pressures in the diaphragm pumping chamber from exceeding a predetermined and adjustable amount, comprising;
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a reciprocable piston operably connected into the diaphragm pumping chamber for developing hydraulic pressure; a sleeve slidably fitted over said piston and having at least a portion of its end surface area exposed to pressures developed in said pumping chamber; a biasing means for urging against said sleeve and for opposing hydraulic pressure forces developed against said sleeve end surface area; and means for slidably seating said sleeve in relation to said pumping chamber, said seating means having a stop for limiting the minimum separation of said sleeve relative to said pumping chamber. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification