Lennox Industries Inc.

Charles W Adams

Floyd E Cherington

James J Mullen

David B Schumacher

Elrede F Schneider

A combustion air blower assembly for a furnace includes a casing, a blower in said casing and a motor for driving said blower secured to said casing. This invention provides unique mounting means for securing the motor in close proximity to the casing, while allowing motor flexure in a direction radial to the axis of the motor to dissipate torsional vibration energy and maintaining the structural integrity of the motor in the axis thereof. The mounting means comprise a plurality of generally J-shaped isolation springs having a loop at each end. One loop of each isolation spring is secured to the casing and the other loop is secured to a bracket on the motor. Each isolation spring is generally flat and extends generally perpendicular from the wall of the casing to which the motor is secured.

Combustion air blower motor isolating spring

An improved combustion chamber for a condensing furnace comprising an elongated cast body having a mixing chamber for receiving fuel and air and an expansion chamber communicating with said mixing chamber, a fuel inlet in said body communicating with said mixing chamber, an air inlet in said body communicating with said mixing chamber and means for igniting the air fuel mixture in said mixing chamber, the fuel inlet and the igniting means being opposed to one another to enhance the ignition of the fuel and air in the mixing chamber. An important feature of the invention is the critical ratio of the transverse cross sectional area of the expansion chamber to the transverse cross sectional area of the mixing chamber for maintaining continuity of operation. Such ratio should be about 2/1 to 2.4/1. In a preferred form of the invention, the igniting means is a spark plug and the spark plug opening into the mixing chamber is co-axial with the fuel inlet. In another aspect of the invention, the ratio of the maximum Btu input for the condensing furnace with respect to the volume (cubic inches) of the mixing chamber of the combustion chamber is in the range of 4,500/1 to 4,800/1.

Combustion chamber construction

Furnace combustion chamber

A gas furnace of the pulsating combustion type having improved sound reduction means comprising an exhaust decoupler body adapted to receive pulsating exhaust gases from the combustion chamber, the exhaust decoupler body having an opening with a silencer tube fixed therein, the silencer tube having an inlet opening receiving the pulsating exhaust gases from the combustion chamber and the silencer tube extending into the exhaust decoupler body and having an outlet opening in the mid-region of said exhaust decoupler body. Outlet means in the form of slots are provided in the length of the silencer tube within the exhaust decoupler body. The silencer tube cooperates with the exhaust decoupler body to dissipate the energy of the pulsating exhaust gases. Resonator means are coupled to the exhaust pipe which connects the combustion chamber to the silencer tube. The resonator means functions to cancel a portion of the energy of the pulsating exhaust gases before it can actuate the walls of the exhaust decoupler body at their resonant frequency. Further the sound reduction means includes an air decoupler body enclosing the air valve of the pulsating type gas furnace. The air decoupler body includes imperforate outer walls having an air inlet opening therein, a layer of sound insulating material adjacent to the outer wall and with or without an inner perforated wall, depending on the volume of the air decoupler body, the air decoupler body being constructed and arranged to prevent the reverberation of sound therein and the escape of sound energy from the air inlet opening.

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Carrollton, TX, United States of America

Charles W Adams