Patent ID: 9121400
Filing Date: 2015-09-01
Classification: F04B

Abstract:
1. A double diaphragm pump comprising: a pair of diaphragm chambers, including a left diaphragm chamber and a right diaphragm chamber; a pair of elastomeric diaphragms, including a left elastomeric diaphragm attached to the left diaphragm chamber, and a right elastomeric diaphragm attached to the right diaphragm chamber; an eccentric for each of the pair of diaphragms, including a left eccentric aligned with and spaced apart from the left elastomeric diaphragm and a right eccentric aligned with and spaced apart from the right elastomeric diaphragm, the left eccentric rotating about an axis of rotation and the right eccentric rotating about the axis of rotation, and the left eccentric being oriented 180 degrees apart from the right eccentric; a left pushrod coupling the left eccentric to the left elastomeric diaphragm and a right pushrod coupling the right eccentric to the right elastomeric diaphragm, rotation of the left eccentric about the axis of rotation causing reciprocating motion of the left pushrod and pumping motion of the left elastomeric diaphragm, and rotation of the right eccentric about the axis of rotation causing reciprocating motion of the right pushrod and pumping motion of the right elastomeric diaphragm, reciprocating motion of the left pushrod proceeding in a direction opposite the direction of reciprocating motion of the right pushrod; a pair of inlet valves, including a left inlet valve for the left diaphragm chamber, and a right inlet valve for the right diaphragm chamber, each inlet valve comprising an inlet flap deflectable from a closed position to an open position, and in the closed position the inlet flap of the inlet valve being substantially horizontal and in the open position the inlet flap being deflected away from substantially horizontal; a pair of outlet valves, including a left outlet valve for the left diaphragm chamber and a right outlet valve for the right diaphragm chamber, each outlet valve for each diaphragm being a flap valve, each outlet valve comprising an outlet flap deflectable from a closed position to an open position, and in the closed position the outlet flap of the outlet valve being substantially horizontal and in the open position the outlet flap being deflected away from substantially horizontal; an inlet fluidly coupled to an inlet manifold, said inlet manifold being fluidly coupled to the pair of diaphragm chambers and each inlet valve being disposed in the inlet manifold, the left inlet valve being disposed between the left diaphragm chamber and the inlet, and the right inlet valve being disposed between the right diaphragm chamber and the inlet; and a relief valve fluidly coupled to the inlet, said relief valve including a valve mechanism comprising an auxiliary passage in fluid communication with the inlet, a valve body urged against a valve seat by a spring and blocking the auxiliary passage when the valve mechanism is closed, wherein the valve mechanism opens via linear displacement of the valve body away from the valve seat when a negative pressure at the inlet reaches a set pressure, and the auxiliary passage defining a conduit for ambient air flow into the inlet when said valve mechanism opens, said ambient air relieving pressure in the left diaphragm chamber and right diaphragm chamber and wherein the valve body comprises a rod having a manual actuator disposed at a first end and having a second end disposed in the auxiliary passage; and and an internal combustion engine with an output shaft, said output shaft rotating while the internal combustion engine runs, and said output shaft providing torque to simultaneously rotationally drive the left eccentric and the right eccentric.