Dispensing – Gas or vapor dispensing
Patent
1994-11-29
1996-08-13
Kashnikow, Andres
Dispensing
Gas or vapor dispensing
222187, B67D 500
Patent
active
055447856
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The present invention relates to a reservoir of gaseous fuel in liquid phase and more particularly to a removable reservoir or cartridge for an apparatus using the combustion of this gas.
Such a reservoir, which is generally of cylindrical shape, has a filling orifice at the centre of its bottom and, at its end opposite the bottom, a draw-off orifice equipped with a draw-off member such as a valve and with an pressure reducer/evaporator, such as a porous element of permeability suited to the desired flow rate.
The objective to be achieved is to store the greatest quantity of fuel in liquid phase in this reservoir, without it being-possible for the liquid phase to reach the pressure reducer, which would cause spluttering deleterious to correct functioning of the apparatus onto which this reservoir is fitted.
One solution consists in storing the liquefied fuel in an absorbant in which it is retained in the liquid state by capillary forces. The absorbant is characterized by its nature and its density; it may also be characterized, in use, by the capillary rise of the absorbed liquid when equilibrium is reached, that is to say when the gravitational forces are balanced by the capillary forces.
The document EP-A-0 202 172 relates to a reservoir for liquid gas, entirely filled with an absorbent material, inside which there is provided a perforated central duct in which a dip tube, intended for the outlet of the gas from the reservoir, is engaged with a clearance.
The document EP-A-0,447,330 relates to a reservoir of fuel stored in liquid phase, the fuel being trapped within a porous or fibrous substance filling the reservoir. This reservoir comprises a dip tube connecting the outlet orifice to the centre of the reservoir.
A certain number of absorbent media have been tested and the capillary rise measured is of the order of 100 mm. This height of capillary rise therefore determines, depending on the other dimensions, the maximum capacity of liquid absorbed.
If the greatest dimension of the reservoir is greater than this 100 mm value, it is not possible to fill the reservoir beyond this .maximum capacity without running the risk of having fuel in free-liquid phase which may reach the pressure reducer, especially if the reservoir is held with its draw-off orifice in the down position.
SUMMARY OF THE INVENTION
The object of the invention is to provide a reservoir of gaseous fuel in liquid phase, which includes a volume of liquid gas in excess with respect to the volume absorbed by an absorbent material, and in which the liquid phase does not reach the pressure reducer, even after turning the reservoir upside down, during which movement a certain part of the liquid gas is desorbed, that is to say is no longer retained by the absorbent material.
For this purpose, the reservoir to which it relates, of the type including an elongate cylindrical wall closed by two transverse end walls, one the lower one and the other the upper one provided with a draw-off orifice equipped with a draw-off member such as a valve and with a pressure reducer, its internal volume being occupied by an absorbent medium, is characterized in that a chamber is provided above the absorbent material, between the latter and the upper end wall of the reservoir, the volume of which is at least equal to the volume of fuel in liquid phase in excess increased by the volume of liquid fuel released by the absorbent medium after turning the reservoir upside down, and in that the draw-off orifice is equipped with a draw-off tube, of fine bore, positioned upstream of the pressure reducer/evaporator, housed axially in the top chamber, and the length of which is at least equal to the height of fuel in liquid phase which may be in this chamber when the reservoir is in inverted position.
When the reservoir is inverted, the excess of fuel in liquid phase occupies the chamber located between the absorbent medium and the upper end wall of the reservoir, without reaching the free end of the draw-off tube.
According to one embodiment of this reservoir,
REFERENCES:
patent: 4063665 (1977-12-01), Schneider et al.
patent: 4729494 (1988-03-01), Peillon et al.
patent: 5083916 (1992-01-01), Glennon et al.
Cricket
Derakshani Philippe
Kashnikow Andres
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