Knowledge of the corrugated hose

The corrugated pipe refers to a tubular elastic element connected with a collapsible wrinkle sheet along the folding and expansion direction. The bellows are used in many instruments, and the main purpose is to be used as a measuring element of a pressure measuring instrument to convert pressure into displacement or force. The corrugated pipe has thin wall and high sensitivity. The open end is fixed, the sealed end is in a free state, and the auxiliary coil spring or reed is used to increase the elasticity. When working, it extends along the length direction of the pipe under the action of pressure, so that the moving end produces a displacement related to pressure. The moving end drives the pointer to directly indicate the pressure.

The bellows are often combined with a displacement sensor to form a pressure sensor with an output of electricity, and are sometimes used as an isolation element. Because the expansion of the bellows requires a large volume change, its response speed is lower than that of Bourdon tubes. Bellows are suitable for measuring low pressure.

The bellows mainly include metal bellows, corrugated expansion joints, corrugated heat exchange tubes, diaphragm boxes and metal hoses. Metal bellows are mainly used to compensate pipeline thermal deformation, shock absorption, absorption pipeline settlement deformation and other effects, used in petrochemical, instrumentation, aerospace, automotive, shipbuilding, high-speed cars, chemical, electric power, cement, metallurgy and other industries. Other materials such as plastic bellows play an important role in media transmission, power threading, machine tools, home appliances and other fields.