Portable water purification apparatus

Water purification apparatus positionable upon an existing water dispenser having an open top water plenum, said apparatus comprising a housing including a base at the bottom of said housing, a feedwater tank for receiving water to be purified, an upstanding boiler having an electrical heating element disposed therein adjacent a lower end for boiling water, a water level control tank having a water reservoir communicating said feedwater tank to said boiler, means for mounting said feedwater tank relative to said water reservoir such that when water within said feedwater tank is above a preselected level there is water in said reservoir, valve control means in said control tank for controlling the level of water in said reservoir from exceeding a predetermined level, means for mounting said control tank at an elevation wherein said predetermined level is above said heating element, whereby said heating element is submerged in water in said boiler, a chamber associated with said level control tank for storage of an anti-foaming agent for limiting formation of foam in said boiler, means for dispensing a controlled amount of anti-foaming agent from said chamber to said reservoir, a condenser for receiving steam from said boiler and for condensing said steam to form distilled water, a distillate tank, means communicating said condenser with said distillate tank for supplying distilled water to said distillate tank, said distillate tank having a water outlet, a port opening downwardly through said base, means for communicating said outlet with said port, float valve means including a valve disposed for opening and closing communication between said port and said outlet, and said valve means including a float for controlling said valve disposed at an elevation below said base for receipt within said water plenum for opening and closing said valve in response to water within said plenum when said apparatus is positioned upon said dispenser.

Water purification apparatus comprising a housing including a plurality of vertically extending walls, a feedwater tank for receiving water to be purified, a distillate tank for storing purified water to be dispensed selectively, an upstanding boiler having a heating element disposed therein for boiling water received from said feedwater tank, a condenser mounted above said boiler for receiving steam from said boiler and for condensing said steam to form distilled water, said condenser comprising a tube twisted about a central opening into a coil having a plurality of convolutions one above the other, a multiplicity of fins disposed about said tube spaced from said walls for providing a surface area substantially larger than that of the tube for transfer of heat from said tube, a fan mounted below said condenser for blowing cooling air upwardly into said opening, sealing means including wall members disposed in abutment with fins on uppermost and lowermost of said convolutions for substantially eliminating air flow upwardly out of said central opening and changing the direction of the path of the air to thereby force said cooling air to flow outwardly from said opening laterally over said fins toward said vertically extending walls and out said housing, and means communicating said condenser with said distillate tank for supplying distilled water to said distillate tank, said sealing means including a pad disposed above said condenser closing said central centric opening and wall members extending downwardly from said pad.

Water purification apparatus comprising a housing including a plurality of vertically extending walls, a feedwater tank for receiving water to be purified, a distillate tank for storing purified water to be dispensed selectively, an upstanding boiler having a heating element disposed therein for boiling water received from said feedwater tank, a condenser mounted above said boiler for receiving steam from said boiler and for condensing said stem to form distilled water, said condenser comprising a tube twisted about a central opening into a coil having a plurality of convolutions one above the other, a multiplicity of fins disposed about said tube spaced from said walls for providing a surface area substantially larger than that of the tube for transfer of heat from said tube, a fan mounted below said condenser for blowing cooling air upwardly into said opening, sealing means including wall members disposed in abutment with fins on uppermost and lowermost of said convolutions for substantially eliminating air flow upwardly out of said central opening and changing the direction of the path of the air to thereby force said cooling air to flow outwardly from said opening laterally over said fins toward said vertically extending walls and out said housing, and means communicating said condenser with said distillate tank for supplying distilled water to said distillate tank, said sealing means including a plate disposed intermediate said boiler and said condenser having an aperture, said fan being fastened to said plate and supplying air through said aperture, and a pad mounted on said plate, said pad having upwardly extending wall members.