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Uses of Bellows

6/15/2012 4:17:07 PM | by Anonymous


Bellows are devices that can deliver pressurized air in a controlled quantity to a controlled location. A regular bellows has a deformable container that would house the air; two handles to control the movement of air; in or out of the bellows, an outlet nozzle to allow air to leave the bellows and an inlet to allow air to enter the bellows. When the handles on the deformable bag container are compressed, the air leaves the bellows from the outlet nozzle and when handles are pulled apart from one-another, air is able to enter the bag from the inlet. Air is only able to enter the deformable bag from the inlet and exit from the outlet nozzle, which makes them usable even very close to a fire and dangerously hot air.



There are several processes that require the use of bellows. In the olden time, bellows were used to provide more air to fire to keep it burning; for instances such as cooking.


Today, many processes still require the use of bellows, such as metallurgical iron smelting and welding. These processes require great amounts of heat which can be generated with the help of bellows. These simple devices are used to provide the fuel with additional air, through the compressing and decompressing of the handles on the bag which causes air to get blown out from the nozzle, thus raising the rate of combustion and which causes the heat output to be increased.


The use bellows is not only limited to providing air for combustion. The box-shaped musical instrument accordion is also bellows driven. It has the characteristic pleated sides that allow air to be taken in and let out. These musical devices can also be referred to as a squeezebox. There are also metal bellows on which bellows technology of the 20th and 21st century is based on. They are made to absorb axial movement in dynamic conditions which gives them their alternative name; Axial Dynamics bellow types. They are elastic vessels that can be compressed if pressure is applied on the outside of the vessels or extended under a vacuum. When the pressure goes back to normal or the vacuum is released, the bellows is able to return to its original shape. However, this is only possible if the bellows has not been stressed past its yield strengths. Modern industry uses reciprocating bellows instead of motorized blowers.


There are two common types of bellows used for various applications today; they are two-chambered forge bellows and double-acting piston bellows.


The two-chambered forge bellows are constructed similarly to fireplace bellows and are the most common type of bellows that are used by blacksmiths to deliver air to the forge due to the to the fact that they are able to provide a near constant stream of air which may be essential in certain manufacturing processes. These bellows are not exactly the same as fireplace bellows consist of a two-section accordion unlike fireplace bellows which have a simpler design. The two section accordion allows for the chambers to be separated by a central divider. Air is drawn into the bottom chamber then forced in the upper chamber which allows it to flow out at a constant rate due to a weight or a spring that would be pushing it down.


Double-acting piston bellows are used when blacksmiths and smelters want to increase the air flow into the forge. As the name would suggest, these bellows are able to blow air out of both strokes of the handle. They are more constant and stronger than regular simple bellows.


There are many types of bellows that have various functions depending on the material used to construct them, their application and their functions.

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