Fluid sprinkling – spraying – and diffusing – With heating or cooling means for the system or system fluid – Spray terminal carrying member carriers heater
Patent
1994-02-02
1995-10-24
Merritt, Karen B.
Fluid sprinkling, spraying, and diffusing
With heating or cooling means for the system or system fluid
Spray terminal carrying member carriers heater
239135, F23D 1144, F23D 1136
Patent
active
054603307
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a burner nozzle assembly used in atomisation fuel oil burners of the type which include an electric fuel heater and electromagnetic stop valve.
There is already known a fuel oil continuous heater for burning light oil or extra-light oil (DE 27 38 377) which provides favorable relationship between fuel oil temperature, oil feed pressure, the burner nozzle to be selected and the heat obtained, which furthermore prevents dripping. To this end the fuel oil pressure continuous heater is provided with an electrical heater, a fuel oil duct coil which encloses the heater and ends in a nozzle chamber and a stop valve, preferably a magnetically operating valve, which is arranged in said nozzle chamber, said stop valve is preceded, in the oil feed direction by a stop thermovalve. Apart from the fact that the arrangement of the heating centrally and the fuel oil duct externally is, considered from a thermo-technical viewpoint, disadvantageous, the coil embodiment of the fuel duct in the fuel oil continuous heater is expensive. This has an unfavorable effect on the structure of the oil continuous heater and renders the latter bulky which is of particular importance when special and definite installation spaces and standard measures are given for a heating plant. In addition thereto, no detail is provided regarding manner of arrangement and embodiment of the magnetic valve or the electric connections for the heater and the magnetic valve. When the device is used with a blower, the diameter variations deteriorate the air stream.
Furthermore, a valve for burners of the atomisation type for fluid fuels is known from DE 24 38 957 B2 which is embodied as a magnetic valve and the housing of which is the burner nozzle holder. The valve has a nozzle which is screwed in combination with a filter in opposition to the magnetic valve into an expansion of the fuel oil exit duct. A fuel oil preheater is not provided in that case. Furthermore, the electric contacts are externally provided on the nozzle holder in the vicinity of the nozzle. They are quite close to the burner flame and, hence, subject to heat effect. In addition thereto they form an obstacle when the nozzle assembly is installed into a heating plant. Furthermore, the housing of the magnetic valve has a larger diameter compared to the nozzle holder which unfavorably affects the blower air stream. Finally, DE 38 00 300 A1 discloses a fuel oil pump device for an atomising burner in which a nozzle assembly including a preheater is connected via a magnetic valve to the the forward pipe of a pump. Within the nozzle assembly there is arranged between the preheater and the nozzle, a stop valve which cooperates with a second stop valve connected to the magnetic valve in order to eliminate any afterspray or dropping. The requirements necessary in this case and which are illustrated by the arrangement of two additional stop valves and a bypass, are considerable.
It is an object of the present invention to combine the advantages of the known devices and to avoid the disadvantages of the same.
Consequently, it is an object of the invention to provide a low cast nozzle arrangement which effectively ensures the required viscosity of the fuel oil and eliminates any dropping ("pre" or "after") from the burner nozzle and which, at the same time, is of a compact and compatible embodiment which permits installation in new and also in existing atomisation burners.
According to the invention said object is realised by the features of a pipe member connected at a first end thereof by a connector with a fuel feed duct and at a second opposite end with a nozzle by means of a second connector, there being means for conducting fuel through the pipe member. An electric preheater is provided to heat fuel in the fuel conducting means and an electromagnetic stop valve is provided in the said conducting means as well with the preheater being arranged between the stop valve and the pipe member first end. Electrical contacts are provided for the preheater and the stop valve thes
REFERENCES:
patent: 2375649 (1945-05-01), Hawley
patent: 2397988 (1946-04-01), Senniger
patent: 3090420 (1963-05-01), Sacco
patent: 3408008 (1968-10-01), Cocks
patent: 4301966 (1981-11-01), Schwarz
patent: 4651928 (1987-03-01), Schmidt
patent: 5069834 (1991-12-01), Babitzka
patent: 5090895 (1992-02-01), Jensen et al.
Brunner Dietrich
Dohla Werner
Steeb Walter
Merritt Karen B.
Rapa Rausch & Pausch Elektrotechnische Spezialfabrik GmbH
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