4. DESCRIPTION:
Calcium carbide safety stove
2) Field Of Invention:-
The Invention relates to provide a handy (palm sized) stove which can be used in calamities and emergencies.
3) Background of invention with regard to the drawback associated with known art
Most of the time in nation calamities and emergencies, the ordinary LPG and kerosene stoves
do not left convenient enough to be used due to their size and requirement of special care to
be taken in handling & storage of their fuel, which is impart a matter concern in calamities.
The similar kind problems are faced by same people in remote areas.
Acetylene, which works as the fuel for burner, is presently and popularly used for cutting and
welding because of its high flame temperature.
But there is not any working device which can be used to produce acetylene and them burn it
efficiently with blue flame (sign of the state in which the fuel is burning we sufficient
presence of oxygen) by taking need oxygen from air
3) (a) only written profile of similar kind of device was published patent application in European EP0093581A2 in year but the device was claimed, was unpractical one due to following regtons:-
3) (a) (1) To burn a gaseous fuel there must be a sufficient mix of primary air but the device which was claimed, was using a tube to bring air, when the air will be passed through tube velocity of air will increased and the pressure will decrease, and this air is being pulled in mnixing tube due to low pressure created by increasing the velocity of the fuel through a jet nozzle, now the because of the decreased pressure of air the difference between the pressure in the sucked air and the pressure in the mixing tube is now decreased so now the primary air will not be sufficient for complete combustion, now the fuel will burn with yellow flame indicating incomplete combustion and system will not be a usable burner, as we use to burn LPG in our houses, which burn the fuel with blue flame.
3) (a) (2) In the same invention part 15 of the same invention, as suggested by the inventor himself this part can be covered with a cover, will close the sink and that is why against the we established law of thermodynamics. So the burning process will not be able to continue itself because there will not be any went, for the produced CO2 and or the H2O to get out from the burning chamber.
3) (b) Now if we assume that the model has been a successful working model then also due to following regions it cannot fulfill our objectives:-
3) (b) (1) This invention was very big in size and because of that region will not be very lelpful for carrying and handling purpose in emergencies and other calamities.
3) (b) (2) Due to its size it will require a big place to be placed somewhere on but generally we don't have this much space most of the time in calamities and in tie emergencies.
3) (b) (3) it will not be very easy to drop it from the helicopter in discussed conditions.
3) (b) (4) for working of this device it need a continuous supply of water at 3 to 5 lb.
pressure, in our conditions of concern, it will be very hard to find or generate such kind of
stove.
One other problem of concern apart from the invention discussed in EP0093581A2 is in such kind of conditions is the storage and handling of the fuel for stoves or burners.
4) Object Of Invention
To provide a stove, which will be ideal for calamites and emergency to cook, the half cooked or easily cooking food, by giving sufficient flame continuously or couple of minutes.
5) A Summary Of Invention
The problems and needs discussed in heading 3 (Background of invention with regard to the
drawback associated with known art) are solved and fulfilled respectively by this invention.
Our invention uses calcium carbide to produce the acetylene, calcium carbide is a solid
compound, which do not catch fire without water and can be stored i l plastic bags very easily
and when mixed with the water only then produces the flammable gas approximately 40% of
its weight.
The whole working stove can be made in the diameter of 7 cm. in height and with 7 cm.
diameter (even less than that if required according to the need).
Acetylene is produced by dropping water in calcium carbide dish; tie produced acetylene is
then taken from the side jets where primary air is mixed in gas, then gas moves up and burns
with the secondary air and heat is produced.
6) A Brief Description Of The Accompanying Drawing
FIG 1:- shows the one example of this Calcium carbide safety stove according to this invention.
7) Detailed description of the invention with reference to drawing/examples
Referring to FIG. 1 can be seen that the calcium carbide safety stove, according to this invention comprise of a carbide holding dish (1) which is filled with the sufficient amount of calcium carbide, by removing bottom cap of the stove
To produce the acetylene water is dropped from the vessel (2) {this is filled by removing top cap of .stove) by a control valve (3) which allows water to fall on the bed of calcium carbide uue to gravity further it has a spring behind it (opposite in the direction of the fall of water) which is set to maintain a specific and safe pressure of gas for the burner, the strength of the spring determines the pressure of gas the higher the strength of spring the higher the pressure of gas can be attained. When that pressure will be achieved the same valve will force spring to compress by the pressure of the gas and now valve (3) will up, and this will stop any more water to fall on the carbide dish.
As shown in the figure the produced acetylene gas taken to the venturi tubes (5) from the jet (4) since jets increase the velocity of the gas the pressure of gas get decreased, now the venturi tube has lesser pressure then the surrounding atmosphere so the air is sucked by venture tube by its opening now it should known to user to burn 1 liter of acetylene we need 2.5 liters of oxygen theoretically but we need more oxygen than it because before the complete combustion of fuel happens, carbon mono oxide gets start being produced so it will need more oxygen then 2.5 liters and if we are using the air to get the oxygen then we will need 11.9 liters (approximately) of air.
Now the introduction of more than one venturi tube and decreasing the diameter of jet (3) will give us more enriched mixture fuel with primary air (primary air is a part of air which is mixed with fuel in venturi tube since the air which is provided to the flame cannot provide the sufficient amount of oxygen which is required for complete combustion) The primary air moves up with fuel and passes through set of blades (6), which is there to change the direction of mixture, which helps mixture to get mixed properly. Now the mixture reaches to the closed part of venturi tube which is covered with the burner cap (7) this burner cap which is heaver and thicker than the other parts of the stove (it helps to keep the temperature low for the fuel mixture which is below it) now it have pipes to through the mixture outside (not the simple holes) this again provide an opportunity to the mixture get mixed more firmly by changing the direction again and again.
Now the mixture burns with secondary air (secondary air is the open air in which the fuel burns at last) and produces the approximately same amount of energy as produced by LPG
with only a difference of 0.2% only on burning of per Kg of gas.
The user can also, if user has the facility to pump the air or oxygen, or to send a stored air or oxygen in the stove he can do it by sending this air in a tube (9) this tube passes this air or oxygen to tube (10) which has its many opening in near to the jet of acetylene, each venturi tube and this will give more amount of primary air or oxygen to the fuel, by this we can burn higher amount of the fuel with high efficiency we also close the openings of the venturi tube by cover (11) at the time when we send our air by this way.

I claim
1. The invention is a palm size stove which burns Acetylene produced from Calcium Carbide, either in stove only; by producing it with a specially designed water dropping system or by supping the acetylene from outside of the stove.
2. A specially designed water dropping system which works on a spring mechanism which allows water to enter only in a certain amount by which a constant pressure of Acetylene can be maintained in the stove automatically.
3. The invented stove may has a primary air introducing system which either use venturi effect to bring air from outside of the stove and to mix it with Acetylene or this primary air is given by pumping in air outside from the stove or by proving stored air or oxygen to the stove.