SPRAY NOZZLE, AND LIQUID FUEL COMBUSTION DEVICE AS WELL AS WATER HEATER EQUIPPED THEREWITH
PROBLEM TO BE SOLVED: To provide a spray nozzle, capable of improving a turn-down ratio, and a fluid fuel combustion device as well as a water heater, which are equipped with such a nozzle. SOLUTION: In a spray nozzle, a distributor 15, provided with inflow grooves 17 formed on the outer peripheral...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a spray nozzle, capable of improving a turn-down ratio, and a fluid fuel combustion device as well as a water heater, which are equipped with such a nozzle. SOLUTION: In a spray nozzle, a distributor 15, provided with inflow grooves 17 formed on the outer peripheral surface of the same and provided with return flow passages 18 formed in the same, is connected to the back surface of an orifice disc 16 equipped with a spraying orifice 20, and a whirling chamber 21 is formed between the back surface of the orifice disc 16 and the front surface of the distributor 15 to pass a part of inflow fluid from the inflow grooves 17 through the whirling chamber 21, and circulate the same into the return flow passages 18 while the spraying amount from the spraying orifice 20 is controlled by changing the amount of circulation. In such a spray nozzle, a taper surface 22, whose diameter is reduced in a curve toward the spraying direction gradually, is formed in the opening unit of inflow side of the spraying orifice 20 of the orifice disc 16. |
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