Evaporative cooler pump apparatus

摘要

Evaporative cooler apparatus includes two pumps, a primary pump which pumps water to an evaporative medium and a secondary pump for pumping water from the bottom of the cooler to drain the cooler. The secondary, or drain pump includes a timer so that it is only on to drain water from the bottom of the cooler for a predetermined time, and after a predetermined number of hours of operation of the primary pump. That is, there is a direct relationship between the operation of the cooler apparatus as evidenced by the primary pump, and the draining of the water at the bottom of the cooler by the secondary, or drain pump. The efficiency of the pumps is increased to allow them to pump with a very low water level without cavitation problems by virtue of an impeller design which includes vanes on the bottom of the impeller disk and vanes on top of an impeller disk. The vanes on top of the impeller disk are disposed radially inwardly from the outer periphery of the outer disk, and the vanes on the bottom of the disk extend radially outwardly from the center portion of the impeller disk. A drain pipe adapter allows a conventional overflow pipe to be used also to drain the water. A conduit from the secondary pump is connected to the drain pipe adapter.