초록 ▼

Improvements to an evaporative cooler having a direct drive fan include mutual adjustment of motor speed and fan blade pitch, a simplified, clog resistant water distribution system, a fan shroud creating minimal air flow noise, and a fouling sensor in the water supply. An adjustable variable frequen

Improvements to an evaporative cooler having a direct drive fan include mutual adjustment of motor speed and fan blade pitch, a simplified, clog resistant water distribution system, a fan shroud creating minimal air flow noise, and a fouling sensor in the water supply. An adjustable variable frequency controller determines motor speed, which complements selected fan blade pitch to operate the fan at a desired speed consistent with avoiding resonance and vibration. The fan shroud has a canted top surface and rounded corners to minimize air flow disturbance. A sensor monitors the water supply for excessive mineral fouling, and activates a drain valve if a present threshold is encountered. A refill valve enables resupply with fresh, unfouled water.

대표청구항 ▼

An evaporative air cooler employing water for cooling comprising: vertical outer walls of evaporative pads; tank means holding a supply of water and retaining water not evaporated by said evaporative material; pumping means forcing said water supply to a top of said evaporative material; conduit mea

An evaporative air cooler employing water for cooling comprising: vertical outer walls of evaporative pads; tank means holding a supply of water and retaining water not evaporated by said evaporative material; pumping means forcing said water supply to a top of said evaporative material; conduit means conducting said water supply from said pumping means to the top of said evaporative material; an electric motor; a direct driven axial fan having an axis of rotation and having more than four fan blades; and an air inlet ring, said axial fan forcing air downwardly through said air inlet ring, said inlet ring defining an aperture centrally located within said evaporative air cooler, said inlet ring comprising a substantially cylindrical portion concentrically surrounding said fan and a flared portion upstream of the cylindrical portion with respect to the direction of air flow, said flared portion curving radially outwardly with respect to the cylindrical portion, whereby laminar air flow is maintained upon operation of said fan, and said evaporative air cooler operates with reduced objectionable air flow noise; a speed controller connected to alternating electrical power, said speed controller providing alternating current to said motor of frequency characteristics selectively identical to an input frequency of the alternating electrical power and reduced therefrom, whereby said motor runs at a manufacturer\s predetermined efficiency at any selected speed equal to and less than a manufacturer\s predetermined nominal speed, to rotate said fan at a selected output; said fan having adjustable blade pitch, whereby said fan and said motor operate to move a selected quantity of air at a selected pressure at a speed selected to avoid vibration of said motor and said fan.