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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 ...
Hydroformed bellows generally have a high tooling cost, but, when mass-produced, may have a lower piece price. However, hydroformed bellows have lower performance characteristics due to relatively thick walls and high stiffness. Welded metal bellows are produced with a lower initial tooling cost and maintain higher performance characteristics.
A sylphon is an old name for a cylindrically symmetrical metal bellows. When made of metal, the sylphon shape was formerly created by metal spinning onto a metal mandrel (model), and now by hydrostatic forming within a mold. Because the mold contains the convolutions of the bellows, the mold must be constructed in parts so that it can be ...
It consists of two metal bellows with an intermediate pipe and connectors on both sides. As a special form of the axial expansion joint, the universal expansion joint has only a limited pressure resistance for stability reasons and, moreover, loads the adjacent pipe supports with the axial compressive force resulting from the internal pressure.
Bellows (photography), accordion-like, pleated expandable part of a camera; Metal bellows, elastic vessels that can be compressed when pressure is applied to the outside of the vessel; Expansion joints; Lungs; Dr. Bellows, a fictional character from the sitcom series I Dream of Jeannie
The advantages to the metal bellows type include exceptionally low spring rate, allowing the gas charge to do all the work with little change in pressure from full to empty, a long stroke that allows efficient usage of the casing volume, and the bellows can be built to be resistant to overpressure that would crush a bladder-type separator.
Starting in the late 18th Century, blowpipes have been powered by mechanisms, initially bladders and bellows, but now blowers, compressors and compressed gas cylinders are commonplace. While blowing air is effective, blowing oxygen produces higher temperatures, and it is also practical to invert the roles of the gasses and blow fuel through air.
Water-powered bellows were in use on blast furnaces in China in 31 AD. [4] By the 13th century, water wheels powered sawmills [5] and trip hammers, to pull cloth and pound flax and later cotton rags into pulp for making paper. Trip hammers are shown crushing ore in De re Metallica (1555). Clocks were some of the most complex early mechanical ...