The role of metal bellows in major fields and the introduction of performance
Release time:
2023-04-28
The role and performance of metal bellows in major fields are introduced
Metal bellows is a kind of metal pipe with a regular wavy appearance. Metal bellows has the advantages of good elasticity, bending resistance and wear resistance, and is widely used in automatic control and measuring instruments, transportation and atomic energy industry and other fields, and is an important component in modern industry.
First, how metal bellows plays a role in major fields
1. Vacuum sealing for vacuum switch
A vacuum switch is a switchgear that conducts current on/off in a vacuum. Its main contact is located in the vacuum interrupter, metal bellows is the key element in the vacuum interrupter, only after the use of metal bellows it is possible to use mechanical force from outside the vacuum interrupter to make the contact move, and can keep the vacuum interrupter shell completely sealed.
2. Used for valve as sealing isolation element
Metal bellows valves, whether it is globe valves, throttle valves, regulating valves, or pressure reducing valves, metal bellows are used as filler-free sealing isolation elements for valve stems. During valve operation, the metal bellows is axially displaced and reset together with the stem, while it is also subjected to the pressure of the fluid and sealed.
3. As a flexible connector
The metal bellows uses its flexibility to compensate for the position deviation caused by installation in the pipeline system and meet the requirements of the directional displacement of the working end, and withstand the fluid pressure of the system.
Metal bellows is irreplaceable in many important industrial fields, which puts forward high requirements for its quality, so while understanding its role, it is necessary to choose different metal materials for different uses, and improve the quality of its role.
Second, the performance of metal bellows
1. The manufacture of metal bellows starts from the selection of raw materials, and through the main process links such as pipe blank manufacturing, bellows forming, shaping, heat treatment, surface treatment, quality inspection, etc., to manufacture corrugated pipes that meet the design requirements.
2. Bellows is a kind of thin shell element with complex shape and high performance requirements. Its manufacturing process is multi-process and complex.
3. Brass
Bellows H80 H -60°C~+100°C Low elasticity, large hysteresis and after-effect, good brazing ability. It can be used as a measuring element in non-corrosive media and instrumentation with low precision.
4. Tin bronze
Bellows QSn6. 5~0。 1 X -60°C~+100°C has good elasticity, strength and corrosion resistance, small hysteresis and elastic after-effects, good brazing ability, and is widely used as a measuring element.
5. Beryllium bronze
Bellows QBe2 P -60°C~+150°C has little hysteresis and elastic after-effects, high elastic stability, corrosion resistance, non-magnetic. It is mostly used in high-precision measuring instruments.
6. Stainless steel
Bellows 1Cr18Ni9Ti G -194°C~+400°C has high bending fatigue strength and corrosion resistance, and good welding performance. It can be used as a measuring, sealing, connecting and compensating element in aggressive media.
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