Combustion – Flame holder having protective flame enclosing or flame... – Including means feeding air axially spaced points of the flame
Patent
1980-11-06
1983-09-27
Scott, Samuel
Combustion
Flame holder having protective flame enclosing or flame...
Including means feeding air axially spaced points of the flame
431 8, 431114, F23D 1500
Patent
active
044066171
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pre-mixing type burner suitable for use as the heat source of hot water heater or hot air heater.
BACKGROUND ART
The invention is concerned with a pre-mixing type burner having a multiplicity of slit-like flame ports which are arranged in juxtaposed relationship with each other and at a right angle to the walls of the combustion chamber with one end of each flame port being in contact with the wall and, more particularly, to a pre-mixing type burner having a comparatively large combustion chamber load of the order of 10.sup.7 Kcal/h.multidot.m.sup.3.
The conventional burner of the type stated above will be described hereinafter with specific reference to FIGS. 1 to 3. The description will be made, by way of example, on an assumption that the vapor of a liquid fuel (kerosene) is used as the fuel and that the burning flame is directed downward.
The reference numeral 1 denotes a burner element disposed linearly. The burner element 1 is provided at its inner central portion with a secondary air passage 2. A multiplicity of secondary air ports 3 in the form of parallel slits are formed in the projected part of the burner element 1. The reference numeral 4 denotes a flame port section provided at both sides of the secondary air passage, and provided with a multiplicity of slit-like flame ports 5. The flame port section 4 has a greater thickness at its central portion than at its outer portions. The burner element 1 is made from an extruded aluminum material. The secondary air ports 3 and flame ports 5 are formed by slotting the end of the extruded blank material by means of a slotting milling machine or the like. The flame ports 5 open also in the burner supporting portion 6 formed at the end of the flame port section 4. The secondary air ports 3 and the flame ports 5 extend at a right angle to the wall of the combustion chamber.
The reference numeral 10 denotes an evaporator for liquid fuel which is integrally attached by welding or the like measure to the burner element 1. The evaporator 10 is provided with an electric heater 11. A liquid fuel and primary air flow into the passage 12. An outlet port for pre-mixed admixture gas is designated by reference numeral 13.
Left and right combustion chamber walls 15, formed of die-cast aluminum and arranged in pair, cooperate with each other to define therebetween a combustion chamber 16 and a passage 17 for the pre-mixed gaseous admixture. The aforementioned supporting portion 6 of the burner element 1 is received by a groove 18. Combustion chamber walls 15, 15 are integrally welded to each other. The combustion chamber 16 has a slightly diverging form with a convection type heat exchanger disposed at the diverged end thereof.
The burner element 1 is closed at its one end by a closure plate 20 which is fastened to the burner element 1 by means of screws 22, with a packing 21 interposed therebetween. This assembly is inserted into the pre-mixed gas passage 17 through a packing 23 and is fixed to the combustion chamber wall 15 by means of screws 24. Reference numerals 25 and 26 denote, respectively, a secondary air inlet port and an inlet port for the primary air and liquid fuel.
The reference numeral 27 denotes a closure plate for closing the other end of the burner element 1, the plate being fixed to the latter by means of screws 29 with a packing 28 interposed therebetween. The combustion chamber 16 and the pre-mixed gas passage 17 are closed by a closure plate 30 which is fixed to the combustion chamber wall 15 by means of screws 32.
The reference numeral 33 denotes a cover for covering the portion of the combustion chamber wall 15 defining the pre-mixed gas passage 17. This cover 33 is inserted into grooves 34 and 35 formed in the closure plates 20 and 27. In order to avoid the condensation of the liquid fuel at the time of ignition, the cover 33 is heated by an evaporator 10 through the medium of closure plates 20 and 27.
The reference numeral 36 designates an ignition electrode.
In operation, when the electri
REFERENCES:
patent: 3304986 (1967-02-01), Zwaagstra et al.
patent: 4175919 (1979-11-01), Matsumoto et al.
Focarino Margaret A.
Hitachi , Ltd.
Scott Samuel
LandOfFree
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