US 5,092,313 AGranted

Gas log fireplace with high heat output

AssigneeVermont Castings, Inc.

InventorsRichard S. Blackburn, William A. Byrne, Stephen F. Richardson, Robert W. Ferguson

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Abstract

A gas log fireplace includes a firebox which defines a combustion chamber, a gas burner located within the firebox, an artificial log set, a log support member positioned on the gas burner, a heat exchanger connected to an exhaust gas outlet of the firebox and a convection chamber which surrounds the firebox and the heat exchanger for heating of room air. The gas burner is fabricated of a refractory fiber material. A combustible gas and primary air are mixed in a Venturi inlet tube of the gas burner. Highly aerated gas flows through front ports and top ports in the gas burner. Secondary air is directed to the front ports and the top ports to obtain highly efficient combustion and high heat output. The artificial log set, the support member and the gas burner define a partially enclosed cavity which is maintained at a high temperature during operation by reradiation from the artificial logs, the support member and the gas burner. The heat exchanger includes an interior rib configuration that provides efficient transfer of heat to room air.

Claims27

Dependent claims

A gas log fireplace comprising:

a firebox defining a combustion chamber and including an air inlet and an exhaust gas outlet;
a gas burner located within said firebox, said gas burner comprising a refractory fiber insulating body having a plurality of front ports in a front surface thereof, a plurality of top ports in a top surface thereof, an inlet for receiving a combustible gas and primary air, and an interior chamber connecting said inlet to said front ports and to said top ports;
means for supplying a combustible gas to the inlet of said gas burner;
a support member comprising a refractory fiber insulating body positioned on said gas burner;
an artificial log set at least partially supported by said support member and positioned relative to said gas burner and said support member so that said log set, said support member and said gas burner define a partially enclosed cavity, the top ports of said gas burner being positioned to direct aerated combustible gas into said cavity;
means for directing secondary air from the air inlet of said firebox to said cavity so that said aerated combustible gas is efficiently burned in said cavity;
a heat exchanger connected to the exhaust gas outlet of said firebox for receiving exhaust gas from said combustion chamber;
and
means for directing room air over said firebox and said heat exchanger for heating of the room air.

6 more elements

A gas log appliance comprising:

a firebox defining a combustion chamber and including an air inlet and an exhaust gas outlet;
a gas burner located within said firebox, said gas burner comprising a refractory fiber insulating body having a plurality of front ports in a front surface thereof, a plurality of top ports in a top surface, an inlet for receiving a combustible gas and primary air, and an interior chamber connecting said inlet to said front ports and to said top ports;
means for supplying a combustible gas to the inlet of said gas burner;
a support member comprising a refractory fiber insulating body positioned on said gas burner;
an artificial log set at least partially supported by said support member and positioned relative to said gas burner and said support member so that said log set, said support member and said gas burner define a partially enclosed cavity, the top ports of said gas burner being positioned to direct aerated combustible gas into said cavity;
and
means for directing secondary air from the air inlet of said firebox to said cavity so that said aerated combustible gas is efficiently burned in said cavity.

4 more elements

Dependencies are inferred from the claim text.