Introduction To Bellows

‌Bellows‌ is a tubular elastic sensitive element connected by foldable corrugated sheets along the folding and stretching direction. It is widely used in instruments and meters, and its main purpose is to be used as a measuring element of pressure measuring instruments to measure pressure by converting pressure into displacement or force. The wall of the bellows is thinner and the sensitivity is higher. The measuring range is from tens of Pa to tens of MPa. Its open end is fixed, the sealed end is in a free state, and an auxiliary spiral spring or reed is used to increase the elasticity. When working, the bellows stretches along the length of the tube under the action of internal pressure, causing the movable end to produce a displacement that is related to the pressure, thereby indicating the size of the pressure‌.