Pump with base plate having spring supports

Abstract

The present invention is a wobble plate pump typically used in a reverse osmosis water purification system. The pump has a piston that is coupled to a wobble plate by a rocker arm. The piston has a stem which snaps into a corresponding sleeve of a diaphragm. The diaphragm is attached to the rocker arm and extends across the inner diameter of the pump to provide an inner pump seal. The piston stem and diaphragm sleeve extend through an access opening in a diaphragm support plate. The access opening of the wobble plate has an inner lip defined by a first relatively small radius near the center of the pump and a second relatively larger radius at the outer portion of the pump. The dual radiuses allow the piston to symmetrically reciprocate about a surface of the diaphragm support plate without inducing excessive stresses in the diaphragm. The symmetrical reciprocating motion maximizes the compression ratio of the pump. The piston reciprocates within a pump chamber defined by a manifold plate. The manifold plate has outlet passages located in a top portion of the chamber, so that when the pump is mounted in a horizontal position any air collected in the top portion of the chamber will be pushed through the passages. The manifold plate also has an air bleed passage that allows entrapped air to escape the pump chamber when the pump is mounted in a vertical, motor up, position. The assembly has a mounting bracket which dampens the resonant audible frequency created by the pump motor and a desiccant that is located with a breather port of the motor.