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Diagram of a fireplace hand-bellows. A bellows or pair of bellows is a device constructed to furnish a strong blast of air.The simplest type consists of a flexible bag comprising a pair of rigid boards with handles joined by flexible leather sides enclosing an approximately airtight cavity which can be expanded and contracted by operating the handles, and fitted with a valve allowing air to ...
Welded bellows (also called edge-welded, or diaphragm bellows) are manufactured by welding a number of individually formed diaphragms to each other. The comparison between the two bellows types generally centers on cost and performance. Hydroformed bellows generally have a high tooling cost, but, when mass-produced, may have a lower piece price ...
[6] [9] These piston-bellows reached as far as Madagascar prior to European contact. [10] The bamboo piston-bellows technology was also adopted early by the Chinese, replacing the indigenous Chinese leather-bellows technology completely. [6] [11] Whether the European fire pistons were influenced by the Southeast Asian fire pistons was a matter ...
The metal bellows accumulators function similarly to the compressed gas type, except that the elastic diaphragm or floating piston is replaced by a hermetically sealed welded metal bellows. Fluid may be internal or external to the bellows.
Although the year of his birth is uncertain, it is known that Du Shi was born in Henei, Henan province. [2] Du Shi became an Officer of Merit in his local commandery before receiving an appointment in 23 as a government clerk under Gengshi Emperor (r. 23–25), following the revolt against the Xin dynasty usurper Wang Mang (r. 9–23). [2]
The Pen Huo Qi ("fire spraying device") was a Chinese piston flamethrower that used a substance similar to petrol or naphtha, invented around 919 AD during the Five Dynasties and Ten Kingdoms period. The earliest reference to Greek fire in China was made in 917, written by Wu Renchen in his Spring and Autumn Annals of the Ten Kingdoms. [15]
Racing engines often fail at high rotational speeds because mechanical springs are unable to retract the valves quickly enough to provide clearance for the piston.Renault's pneumatic valve technology replaced steel springs with light weight compressed air bellows.
Examples include a bicycle pump, pumps that are used to aerate an aquarium or a pond via an airstone; a gas compressor used to power a pneumatic tool, air horn or pipe organ; a bellows used to encourage a fire; a vacuum cleaner and a vacuum pump. All air pumps contain a part that moves (vane, piston, impeller, diaphragm etc.) which drives the ...
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