how does a blow torch work

i was thinking of making a mini blow torch. but i have no idea how it works or hot to make on. my bro has this mini torch that give out a blue flame. it just uses a simple refeulable cartridge. it uses butane. i have a barbecue lighter i dissected and i want to make one. but does anyone know how it works or how to make one?

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DzakirH3 years ago

Maybe, you should try dissecting your Bro's blue flame and have a look inside. That would be a normal lighter catridge which is refillable connected to a sillicon tube to a compressor with air holes and together with the wire from the Piezo Electric sparker to ignite it. Try examine the compressor, you would see air hole(s) which works pretty much similar to a bunsen burner. I'm not really sure how it works but I do know that it compresses the gas with the air in the surroundings going through thr air hole

jtobako9 years ago
gck249 years ago
hey I need to know how a blow torch works like a diagram. when I tried to blow up the one pat sowers sent it got really blurry. I've been looking for several days for a diagram like that but can't find any could you help me out?
Goodhart9 years ago
The jet, etc. being so small, would be even harder to work with then a normal sized one.
Goodhart9 years ago
a torch for burning pockets ? Oh you mean like this pencil torch ?
Kiteman9 years ago
I think you're on your own there, unless you resort to google.
Kiteman9 years ago
You need a venturi.

Have a look at a Bunsen burner - the gas enters the base of the chimney via a narrow jet and blows up the much wider chimney.

When you open the air-holes at the bottom, the venturi effect (fast fluids have lower pressure) draws air in through the holes. The gas and air mix as they flow up the chimney, giving a decent proportion of gas:oxygen.

The trick is getting all the variable balanced - the flame burns back along the jet of gas, so you need the gas to flow out as fast as it burns.

The length and diameter of the chimney will affect the burn, as will the diameter of the gas-jet, the size of the air-holes and their exact position in relation to the gas-jet.

Good luck...
Pat Sowers9 years ago
i have no idea
Pat Sowers9 years ago
The chemistry....Combustion (fire!) requires both fuel and oxygen (air). When butane gas burns completely, with sufficient oxygen, it burns with a blue flame at 1300 degrees Celsius. With ordinary lighters the combustion of butane is incomplete, resulting in a yellow 'flame' due to the glowing particles of carbon oxidizing slowly to C02. The physics....The reason for the different combustion properties of pocket torches and ordinary lighters has to do with the 'head' (actually called a 'fire nozzle') that you described. This nozzle is basically a metal plate containing very small holes. Air is sucked in from another hole in the side of the nozzle and is then forced through the small nozzle holes. The very small size of the holes causes a pressure build-up (and therefore very high gas flow velocity) which has two important effects. First of all, enough air (oxygen) is drawn in to completely combust the butane. Secondly, the resulting flame shoots straight out and is "strong" enough to withstand windy conditions without blowing out. A good analogy is the effect of putting your finger on the end of a water hose. The smaller the opening, the greater the force of water exiting the hose. Two other aspects of the pocket torch which you may find interesting are an internal catalyst coil and piezoelectric ignition. Unfortunately I wasn't able to find out too much about the catalyst. The piezoelectric ignition, standard to most lighters, involves a quartz crystal which, upon being hit sharply, produces a high voltage electric discharge (a spark) which ignites the butane/oxygen mixture. i got this from a site.
Pat Sowers9 years ago
The chemistry....Combustion (fire!) requires both fuel and oxygen (air). When butane gas burns completely, with sufficient oxygen, it burns with a blue flame at 1300 degrees Celsius. With ordinary lighters the combustion of butane is incomplete, resulting in a yellow 'flame' due to the glowing particles of carbon oxidizing slowly to C02. The physics....The reason for the different combustion properties of pocket torches and ordinary lighters has to do with the 'head' (actually called a 'fire nozzle') that you described. This nozzle is basically a metal plate containing very small holes. Air is sucked in from another hole in the side of the nozzle and is then forced through the small nozzle holes. The very small size of the holes causes a pressure build-up (and therefore very high gas flow velocity) which has two important effects. First of all, enough air (oxygen) is drawn in to completely combust the butane. Secondly, the resulting flame shoots straight out and is "strong" enough to withstand windy conditions without blowing out. A good analogy is the effect of putting your finger on the end of a water hose. The smaller the opening, the greater the force of water exiting the hose. Two other aspects of the pocket torch which you may find interesting are an internal catalyst coil and piezoelectric ignition. Unfortunately I wasn't able to find out too much about the catalyst. The piezoelectric ignition, standard to most lighters, involves a quartz crystal which, upon being hit sharply, produces a high voltage electric discharge (a spark) which ignites the butane/oxygen mixture. i got this from a site.
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