Why are bellows widely used in petrochemical, instrumentation, aerospace, chemical, power, cement, metallurgy and other industries? This is also due to its own advantages. First of all, the bellows has an irreplaceable role in the fields of media transmission, power threading, machine tools, and home appliances. It is also a flame-retardant material and is very popular. Let me take you to understand why the bellows are difficult to burn?
Bellows mainly include metal bellows, corrugated expansion joints, corrugated heat exchange tubes, and metal hoses; metal bellows are mainly used to compensate for thermal deformation of pipelines, shock absorption, and absorption of pipeline settlement deformation.
Metal hoses are used for protection of signal lines, transmission wires and cables, optical fiber and optical cables of various equipment; for example: public telephones, remote water meters, door magnetic alarms and other equipment that require safe protection of wires; protection of various small wires Pipe; solar equipment pvc outer protective film, etc. The elbow force balance corrugated expansion joint is used for the connection between equipment and equipment. Its function is to compensate for the thermal expansion of the pipeline between the two equipment, reduce the force generated by the installation error on the equipment, and facilitate the installation. The use of bending force balance type bellows expansion energy-saving makes the equipment not affected by the blind plate force generated by the internal pressure, improves the stress condition of the equipment, and the equipment is easy to fix.
The flame-retardant bellows is actually the same as the PVC bellows. The bellows refers to the tubular elastic sensitive elements connected by the foldable corrugated sheet along the direction of folding and stretching. Bellows are widely used in instruments and meters, the main purpose is to be used as a measuring element of pressure measuring instruments to convert pressure into displacement or force.
The bellows has a thin wall and high sensitivity. The measuring range is from tens of MPa to tens of MPa. Its open end is fixed and the sealed end is in a free state. The auxiliary coil spring or reed is used to increase the elasticity. Under the action of internal pressure, the tube is elongated along the length of the tube, so that the movable end generates a displacement that has a certain relationship with the pressure. The movable end can directly indicate the pressure by driving the pointer.
Bellows are often combined with displacement sensors to form pressure sensors with electrical output, and are sometimes used as isolation elements. Because the expansion of the bellows requires a large volume change, its response speed is lower than the bellows. Bellows are suitable for measuring low pressure.
