초록 ▼

A power vented water heater has a radiant gas burner located in a combustion chamber disposed beneath the storage tank portion of the water heater, and a draft inducer fan supported above the top end of the storage tank by a one piece molded plastic adapter fitting having a tubular body interconnect

A power vented water heater has a radiant gas burner located in a combustion chamber disposed beneath the storage tank portion of the water heater, and a draft inducer fan supported above the top end of the storage tank by a one piece molded plastic adapter fitting having a tubular body interconnecting the upper end of the water heater flue to the inlet of the fan, and a transverse outlet leg. A combustion gas discharge pipe is connected to the fan outlet, and an air intake pipe has a first portion connected to the outlet leg of the adapter fitting to deliver combustion gas cooling air thereto, and a second portion coupled to the burner inlet to deliver combustion air thereto along with gaseous fuel introduced into the second portion of the air intake pipe from an externally mounted gas valve. Integral orifice structures within the adapter fitting automatically maintain a predetermined ratio among the combustion gas, cooling air and combustion air flows. The operating pressure differential between the combustion discharge pipe and the first portion of the air intake pipe is sensed to monitor the structural integrity of the overall piping structure.

대표청구항 ▼

A water heater comprising: a storage tank adapted to hold a quantity of water to be heated and having top and bottom ends, inlet opening means for receiving water to be heated, and outlet means for discharging heated water; wall means for forming a combustion chamber disposed beneath said storage ta

A water heater comprising: a storage tank adapted to hold a quantity of water to be heated and having top and bottom ends, inlet opening means for receiving water to be heated, and outlet means for discharging heated water; wall means for forming a combustion chamber disposed beneath said storage tank; fuel burner means disposed in said combustion chamber and operative to receive an air/fuel mixture from a source thereof, burn the received air/fuel mixture to thereby heat water disposed in said storage tank; an exhaust flue vertically extending through the interior of said storage tank and operative to receive and discharge hot combustion gas generated by said fuel burner means during operation thereof, said exhaust flue having a bottom end communicating with the interior of said combustion chamber, and a top end communicating with the exterior of said storage tank through said top end thereof; a draft inducer fan disposed above said top end of said storage tank and having an inlet and an outlet; and adapter means, interposed between said draft inducer fan and said top end of said storage tank, for supporting said draft inducer fan, flowing hot combustion gas discharged from said exhaust flue into said inlet of said draft inducer fan, and receiving a flow of cooling air from a source thereof for mixture with and cooling of hot combustion gas entering said inlet of said draft inducer fan, said adapter means being of a unitary construction and having integral first and second orifice means for respectively restricting the flow of combustion gas and cooling air into the interior thereof, said adapter means having a vertically oriented tubular body portion with a tubular leg portion horizontally extending outwardly from an axially intermediate portion thereof, said first orifice means including a first transverse interior wall disposed within a lower end portion of said tubular body portion and having a first opening therein, and said second orifice means including a second transverse interior wall disposed in said tubular leg portion and having a second opening therein.