초록 ▼

The disclosure relates to pulse combustion apparatus generally and to air furnaces of the pulse combustion type. In one aspect, the invention provides a furnace which includes a combustion chamber and an exhaust system disposed in a passageway for air to be heated. The exhaust system includes a prim

The disclosure relates to pulse combustion apparatus generally and to air furnaces of the pulse combustion type. In one aspect, the invention provides a furnace which includes a combustion chamber and an exhaust system disposed in a passageway for air to be heated. The exhaust system includes a primary exhaust pipe, a manifold to which the primary exhaust pipe is coupled, and a plurality of heat exchange pipes which extend from the manifold across the air passageway. The primary exhaust pipe, manifold and heat exchange pipes form a reasonant system with the combustion chamber so that the ignition of successive fuel charges in the chamber causes pressure waves to oscillate throughout said exhaust system including the heat exchange pipes for promoting transfer of heat from the pipes to air flowing through the passageway in use. According to another aspect of the invention there is provided a control system for a pulse combustion apparatus in which the air velocity in a combustion air intake is sensed and used for controlling the apparatus. The system responds to a first air intake velocity as indicating satisfactory operation of a starting blower and activates the gas supply and ignition means, and to a second air intake velocity as indicating establishment of combustion; the circuit will then de-activate the ignition means and blower. The system also includes a timer which will shut off the gas supply if the second velocity is not achieved after a predetermined time interval from initiation of a starting attempt.

대표청구항 ▼

A pulse combustion air furnace comprising: means defining a passageway through which air to be heated can flow; a combustion chamber having a fuel charge inlet and an exhaust gas outlet; means supporting the combustion chamber in said air flow passageway; means associated with said combustion chambe

A pulse combustion air furnace comprising: means defining a passageway through which air to be heated can flow; a combustion chamber having a fuel charge inlet and an exhaust gas outlet; means supporting the combustion chamber in said air flow passageway; means associated with said combustion chamber inlet for admitting successive fuel charges to said chamber; means operable to initiate combustion in said chamber; an exhaust system disposed in said air passageway and comprising a primary exhaust pipe having first and second ends and coupled at its first end to said exhaust gas outlet of the combustion chamber; a manifold having an inlet to which said second end of the primary exhaust pipe is coupled and a plurality of outlets; and a plurality of heat exchange pipes each having an inlet coupled to one of said manifold outlets and an outlet, said pipes extending from the manifold across said air passageway so that the pipes are disposed in the path of air flowing through said passageway in use; and, means defining a muffler chamber to which said second ends of the heat exchange pipes are coupled; said primary exhaust pipe, manifold and heat exchange pipes forming a resonant system with said combustion chamber so that the ignition of successive fuel charges in said combustion chamber causes pressure waves to oscillate throughout said exhaust system including the heat exchange pipes for promoting transfer of heat from said pipes to air flowing through said passageway in use.