Bellows are widely used in instrumentation, including metal bellows, vacuum bellows, corrugated expansion joints, corrugated heat exchange tubes, diaphragm bellows and metal hoses. What is the bellows? What is it for? Today we will talk about the main use of bellows.
A bellows is a tubular elastic sensor that is connected by a foldable crepe sheet in a folding direction. If you don't understand this lengthy, then you only need to know that it is a pressure measuring elastic element in a pressure measuring instrument. The principle is measured by converting pressure into displacement or force.
Bellows are usually thinner and have higher sensitivity, measuring from tens of kPa to tens of MPa. 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. Its open end is fixed, the sealed end is free, and the auxiliary coil spring or reed is used to increase the elasticity. During operation, it is elongated along the length of the tube under the action of internal pressure, so that the movable end generates a displacement in a certain relationship with the pressure. The active end drives the pointer to directly indicate the pressure.
Bellows are often combined with displacement sensors to form a pressure sensor that outputs electricity, sometimes as an isolation element. Since the bellows stretch requires a large volume change, its response speed is lower than that of the Bourdon tube. The bellows is suitable for measuring low pressure.
The metal bellows is mainly used to compensate for the thermal deformation, shock absorption and absorption line deformation of the pipeline. Metal bellows are 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 the fields of medium transportation, power threading, machine tools, and home appliances.
The stainless steel bellows compensator is installed in the liquid delivery system as a flexible pressure tube. The stainless steel bellows compensator is used to compensate the mutual displacement of the connecting end of the pipeline or machine and equipment, absorb the vibration energy, and can play the role of vibration reduction and noise reduction. It has many characteristics such as good flexibility, light weight, corrosion resistance, fatigue resistance, high temperature resistance and so on.
According to the use of welded metal bellows, it can be roughly classified into airtight watertight type and wound type. Airtight watertight is a metal bellows specially designed to transport gas gas or water heaters. It has good sealing and can avoid leakage and water leakage. The wound metal bellows are mostly used for corrugated tubes of magnetic card telephones or desk lamps, and such bellows have high safety.
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 sometimes used as an elastic joint for two parts. The bellows can be divided into metal bellows and non-metal bellows according to the constituent materials. 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.
Finally, I briefly conclude that the bellows is often used as a pressure measuring element, which is its main purpose. It can also be used as an isolating element, a compensating element or as an elastic joint of two parts in combination with other equipment. The above is the main use of the bellows and plays an important role in many fields.
The above mentioned text is the introduction of main uses of the bellows. If you want to know more about bellow, please contact with us. Henan lanphan is a qualified company which boasts good reputation both home and abroad. For several decades, we are dedicated to the manufacture of laboratory equipment and pipe fittings. If you want to know more about our products and intend to purchase our products, please contact with us as soon as possible. We are willing to provide you as much information as possible.