Combustion – Mixer and flame holder – Bunsen burner type
Patent
1991-06-17
1993-08-24
Jones, Larry
Combustion
Mixer and flame holder
Bunsen burner type
251205, 251329, 126 39R, F23D 1462, F16K 300
Patent
active
052383989
ABSTRACT:
A variable orifice gas modulating valve for use with an atmospheric Bunsen-type burner is disclosed. The variable orifice valve discharges a jet of fuel directly into the burner mixing tube and modulates the gas flow to the burner by changing the cross-sectional area of the gas jet. This is accomplished by a thin moveable sheet interposed between a valve body and a cap, through which pass the upstream and downstream portions of a short gas discharge passageway. The sheet has a hole which is positioned relative to the axis of the gas discharge passageway so as to produce a discharge orifice of variable size. The gas jet has the same velocity at all inputs, and flow rate variation is manifested by variation in the jet cross-sectional flow area. This contrasts with the conventional method for gas flow modulation for atmospheric burners wherein the gas jet issues from a fixed orifice and the gas pressure ahead of this orifice is modulated such that variable flow rate is manifested in a gas jet of constant cross-sectional flow area and variable velocity. These two methods of gas flow modulation result in quite different flame characteristics as the burner is turned down, and the variable orifice valve produces superior combustion characteristics at low input. The variable orifice gas valve also has the advantages of mechanical simplicity and linearity of heat input versus valve setting.
REFERENCES:
patent: 1272263 (1918-07-01), Hooker
patent: 1283907 (1918-11-01), Rigby
patent: 1671617 (1928-05-01), Spitzglass
patent: 2917069 (1959-12-01), Lundy et al.
patent: 3514041 (1970-05-01), van Rooyen
patent: 4043535 (1977-08-01), Freeman et al.
patent: 4283041 (1981-08-01), Kujawski
patent: 4794907 (1989-01-01), Corliss et al.
patent: 5020774 (1991-06-01), Christianson
patent: 5137261 (1992-08-01), Clifford
Harmony Thermal Company, Inc.
Jones Larry
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