| 摘要 |
Apparatus for automatically draining the water from an evaporative cooler when operation thereof is terminated and for periodically draining, flushing and replacing the water during operation of the cooler. The apparatus includes a comparatively small reservoir tank, which depends from the bottom of the cooler, for containing the cooler's water supply and a pump, a siphon drain valve and at least the float of a float controlled water supply shutoff valve. The water is recirculatingly supplied from the tank to the cooler and returns to the tank and that water will increase in mineral concentration and other cooler damaging contaminants during such recirculation. When both the pump and water supply are shutoff, such as upon termination of cooler usage, the apparatus will automatically commence its drainage operational mode wherein the returning water will raise the water level in the tank to prime the siphon drain valve which drains the water from the tank. By periodically interrupting operation of the pump only, the apparatus will automatically commence its draining, flushing and refilling operational mode wherein the returning water will prime the siphon drain valve which drains the tank at a faster rate than makeup water is supplied thereto which causes flushing of the tank, and when drainage is complete, the siphon drain valve will lose its prime and the incoming fresh water will refill the tank. The tank is provided with an especially configured floor so that the pump will positively interrupt the siphoning action at the appropriate time during the draining, flushing and refilling operational mode of the apparatus and a special timing device is employed to initiate and control pump operation during that operational mode.
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