Corrugated conduit refers to a tubular elastic sensitive element connected by foldable corrugated sheets along the folding expansion direction. Bellows is widely used in instruments and meters. It is mainly used as the measuring element of pressure measuring instruments to convert pressure into displacement or force. The corrugated conduit has thin wall and high sensitivity, and the measurement range is tens of MPa to tens of MPa. The open end of the utility model is fixed, the sealing end is in a free state, and an auxiliary coil spring or reed is used to increase the elasticity. When working, it elongates along the length direction of the pipe under the action of internal pressure, so that the movable end produces a displacement related to the pressure. The movable end drives the pointer to directly indicate the pressure. Bellows are often combined with displacement sensors to form a pressure sensor with electrical output, and sometimes used as an isolation element. Because the expansion of bellows requires large volume change, its response speed is lower than that of Bourdon tube. Bellows are suitable for measuring low pressure.(corrugated conduit)
