Liquid fuel burner

Fluid sprinkling – spraying – and diffusing – With system fluid relief or return to supply – Recirculation within nozzle

Patent

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Details

13762543, 2391325, 239571, 251206, 251208, B05B 900

Patent

active

045469210

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a liquid fuel burner of the kind comprising a valve housing, a burner unit including an atomiser for liquid fuel, ducting for conveying liquid fuel between the valve housing and the atomiser and an atomiser control valve movable in response to flow of liquid fuel in a first direction through said ducting to close said atomiser and return liquid fuel from the atomiser to the valve housing and movable in response to flow of liquid fuel in a second direction through said ducting to open said atomiser to allow at least some of the liquid fuel conveyed to the atomiser to be discharged therefrom and to return any surplus liquid fuel to the valve housing, inlet and outlet passages in said valve housing for conveying liquid fuel into and from the valve housing, and a rotary change-over valve in the valve housing which is turnable into different positions to condition the burner for flow of liquid fuel from said inlet passage through said ducting in either said first direction or said second direction. In order to simplify the ensuing description, such liquid fuel burners will be called "fuel burners of the kind referred to".
Fuel burners of the kind referred to, which are known as spill return burners, have been known for many years, a typical example being described in British Patent Specification No. 681,800. They can operate in one of two modes, depending on the position of said change-over valve. When the latter is in its said first position, liquid fuel simply circulates through said ducting from the valve housing to the atomiser and back to the valve housing. The burner is then said to be in its "circulate mode", the object of circulating liquid fuel through the burner being to keep the burner unit, and particularly its atomiser, cool. When, on the other hand, the change-over valve is in its said second position, and liquid fuel is discharged from the atomiser, the burner is said to be in its "fire mode".
In order to vary the rate at which fuel is discharged from the atomiser when a fuel burner of the kind referred to is in its fire mode, it is known to provide the burner with a separate spill return valve which can be used to vary the proportion between the amount of fuel that is allowed to discharge from the atomiser and the amount that is returned from the atomiser to the valve housing.
The present invention aims to provide a fuel burner of the kind referred to and having means for varying the rate at which fuel can be discharged from the atomiser, which is of simpler construction compared with hitherto known fuel burners of this kind with separate spill return valves.
According to the invention, in a fuel burner of the kind referred to, said rotary change-over valve is turnable into a first position to condition the burner for flow of liquid fuel from said inlet passage through said ducting in said first direction, and is turnable into a plurality of further positions in each of which the burner is conditioned for flow of liquid fuel from said inlet passage through said ducting in said second direction, said further positions of the rotary change-over valve providing different rates of fuel discharge from the atomiser.
In a fuel burner in accordance with the invention, the roles played by the change-over valve and the separate spill return valve in the hitherto known fuel burners of the kind referred to are combined in a single rotary change-over valve.
The rotary change-over valve of a fuel burner in accordance with the invention may have a plurality of discrete further positions in each of which the rate of discharge of fuel from the atomiser is different compared with the remaining further position or positions. Alternatively, the rotary change-over valve may be infinitely variable so that the rate of discharge of fuel from the atomiser is infinitely variable between minimum and maximum rates of discharge.
The rotary change-over valve of a fuel burner in accordance with the invention may be formed as a part of the burner unit or it may be detachably secured to the burner unit

REFERENCES:
patent: 1495870 (1924-05-01), O'Donnell
patent: 2247227 (1941-06-01), Findley
patent: 2263913 (1941-11-01), Bargeboer
patent: 2737976 (1956-03-01), Clack
patent: 2852040 (1958-09-01), Deardorff
patent: 4327758 (1982-05-01), Uhlmann

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