Combustion – Combustion bursts or flare-ups in pulses or serial pattern
Patent
1987-12-01
1989-01-03
Dority, Jr., Carroll B.
Combustion
Combustion bursts or flare-ups in pulses or serial pattern
F23C 1104
Patent
active
047953403
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a single-leaf valve for gas-fired boilers and, more specifically, to a valve for a boiler that comprises a combustion chamber in which pulsewise combustion involving a fuel and an oxidant occurs, the fuel/oxidant mixture being introduced into this chamber in an intermittent manner.
Several devices for supplying a pulsed-combustion chamber with a fuel/oxidant mixture are described in French Patent Application No. 84 04 921 which, dated Apr. 29, 1984, was filed in the name of the Applicant. In each of the devices thus described, the oxidant, in this instance air, is introduced into the combustion chamber through inclined orifices that are provided in an upper plate, whereas the fuel, for example heating oil, is continuously injected by means of a spray nozzle or injection head which is screwed into a bore that is provided in the upper plate.
In one embodiment, a valve leaf is installed between the inside face of the upper plate and a valve leaf seat which is fixed to the throat of the combustion chamber.
In another embodiment, a plurality of valve leaves are installed in a manner such that they possess translational mobility inside centering stops which are fixed to the upper plate. In all cases, the leaf (or leaves) is (or are) pressed flat against the upper plate when, following the initial explosion, the pressure in the combustion chamber becomes higher than the pressure at which the air is injected.
For this reason, when the boiler is not operating, and/or when low pressures prevail in the combustion chamber, the valve leaf (or leaves) is (or are) open, and air is introduced into the pulsed-combustion chamber. Moreover, and because of the very construction of the valve leaves and upper plate, it is difficult to reduce the leaf opening time during operation. In fact, the application of one plane surface to another, namely the pressing of the valve leaves flat against the facing surface of the upper plate, necessitates a higher pressure at the moment when the air is admitted to the pulsed-combustion chamber.
Lastly, it should be noted that it is rather difficult to produce a fuel/oxidant mixture.
SUMMARY OF THE INVENTION
The present invention sets out to remedy the above-mentioned disadvantages, and its object is to propose a leaf valve which utilizes only one leaf, both for admitting each of the constituents of the mixture and for admitting a mixture that has been produced upstream of the pulsed-combustion chamber.
To achieve this object, the valve is of the leaf type, and is for a gas-fired boiler that comprises a chamber in which a mixture of constituents such as air and gas are burned, a body which is fixed to the top of the combustion chamber, and ignition means which are located within the body and are suitable for producing the explosion of the air/gas mixture in the said combustion chamber. Also included are a valve seat and a valve leaf which are located between the body and the combustion chamber, the leaf valve comprising a leaf which is flexible and deformable, and which is pressed flat against the valve leaf seat when the boiler is not operating. The valve leaf seat has two or more grooves, the first of these grooves being an anti-stick groove which serves to prevent the leaf from sticking to the seat, and the second of these grooves communicating with means whereby at least one of the constituents of the mixture is supplied.
Since the single valve leaf is closed when not operating, air cannot be admitted to the combustion chamber for at least as long as the air pressure is insufficient to repel the leaf from its seat.
By virtue of its flexible construction, the valve leaf is caused to execute a translational movement in the vertical direction, through a very short distance, then deforms within the portion facing the means via which the constituents of the mixture are admitted, and returns elastically to the closed position as soon as admission ceases.
Other advantages and characteristics will become evident on reading the descri
REFERENCES:
patent: 2701950 (1955-02-01), Huber et al.
patent: 3286728 (1966-11-01), Stephenson
Dority Jr. Carroll B.
Societe Nationale Elf Aquitaine
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