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Bellows correct use of temperature specification how much do you know?

Bellows refers to the use of foldable wrinkles in the direction of folding expansion of the tube-like elastic sensitive components. Bellows in the instrumentation of a wide range of applications, the main purpose is as a pressure measuring instrument measuring elements, the pressure to convert to displacement or force. The corrugated pipe has a thin wall and a high sensitivity, measuring range of dozens of PA to dozens of MPA. The opening end is fixed, the sealing end is in a free State, and the auxiliary helical spring or reed is used to increase elasticity. When working under the action of internal pressure in the direction of the length of the pipe elongation, so that the active end produces a certain relationship with the pressure displacement. The active end of the pointer can directly indicate the size of the pressure. Bellows are often combined with displacement sensors to form a pressure sensor that is output to power, and is sometimes used as an isolating element. Because the expansion of the bellows requires larger volume changes, its response rate is lower than that of the wave-boarding tube. Bellows are suitable for measuring low pressure.

Metal bellows-type components of the use of temperature range is very wide, generally in the design and manufacture of elastic components before giving. Some special-purpose bellows, the lumen through the liquid oxygen ( -196℃) or lower temperature of liquid nitrogen, withstand pressure up to 25MPa. Pipe network system connected with large bellows expansion joint (nominal diameter sometimes more than LM), requires 4MPa, temperature 400 ℃, and has a certain corrosion resistance stability. The temperature adaptability of the elastic element depends on the thermal resistance of the elastomer. Therefore, according to the application temperature range of the elastic element, the elastic material with suitable temperature performance parameters can be used to manufacture the qualified corrugated pipe type components.


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