The bellows mainly includes metal bellows, bellows expansion joints, corrugated heat exchange tubes, diaphragm bellows and metal hoses. Metal bellows is mainly used to compensate for the thermal deformation, shock absorption and absorption line deformation of pipelines. It is widely used in petrochemical, instrumentation, aerospace, chemical, electric power, cement, metallurgy and other industries. Other materials such as plastic bellows have an irreplaceable role in media transportation, power threading, machine tools, and home appliances.
Bellows: A pressure measuring elastic element in a pressure measuring instrument. It is a cylindrical thin-walled corrugated casing with a plurality of transverse corrugations. The bellows is elastic and can be displaced under the action of pressure, axial force, lateral force or bending moment. Bellows are widely used in instrumentation and are mainly used as measuring elements of pressure measuring instruments to convert pressure into displacement or force. The wall of the bellows is thinner and has a high sensitivity. The measuring range is from tens of Pa to tens of MPa. In addition, the bellows can also be used as a sealing spacer to separate the two media or prevent harmful fluids from entering the measuring portion of the device. It can also be used as a compensating element to compensate for the temperature error of the instrument with its variability in volume. It is also sometimes used as an elastic joint for two parts. According to the constituent materials, the bellows can be divided into metal bellows and non-metal bellows; according to the structure, it can be divided into single layer and multiple layers. Single layer bellows are used more. Multi-layer bellows have high strength, good durability and low stress, which are used in important measurements. The material of the bellows is generally bronze, brass, stainless steel, Monel and Inconel.