A bellows is a flexible sensor, which is connected in a folding and contraction direction by a flexible crepe sheet. The bellow are widely used in the instrumentation, which are mainly used as the measuring elements of pressure measuring instruments to convert the pressure into displacement or force. Bellows plays a significant role in the several fields, including the petrochemical,instrumentation, aerospace, chemical, electric power, cement and other industries.In this paper, the author would like to introduce the five types of the bellows, including the metal bellows, bellows expansion joints, corrugated heat exchange tubes, diaphragm bellows and flexible metal conduit.
The bellows have a relatively fixed open end, 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 is capable of generating a displacement in a certain relationship within the pressure. Bellows are often combined with displacement sensors to form a pressure sensor that outputs electricity. Since the bellows stretch requires a large volume change, and its response speed is lower than that of the tube. The bellows is suitable to measuring low pressure.
Five Types of the Bellows:
As a sensitive component, pressure reducing component, compensation component, valve component, the bellows are widely applied in the automatic control,measuring instruments, vacuum technology, machinery industry and so on. Metal bellows are made of different metals, which depends on their applications. Metal bellows is mainly used to compensate for thermal deformation, pressure reduction and line deformation of pipelines. It is widely used in petrochemical, instrumentation, aerospace, chemical, electric power, cement, metallurgy and other industries.
2.Bellows expansion joints
The bellows expansion joints play the same role as a compensation, which is a flexible structure that is placed on a container casing or pipe to compensate for additional stress caused by temperature differences and mechanical vibrations. As an elastic compensation component, the bellows expansion joints can be freely stretched and has the advantages of reliable operation, good performance and compact structure, and has been widely used in chemical, metallurgical, nuclear energy and other departments.
3.Corrugated heat exchange tube
The bellows heat exchange tube is an emerging new type of shell-and-tube heat exchange tube. The heat exchange element replaces the original smooth straight tube with a corrugated heat exchange tube, which increases the heat transfer efficiency by 2 to 4 times. The structure of the corrugated heat exchange tube changes periodically, which is much more complicated than the smooth straight tube. It has a full disturbance effect on the fluid inside the tube, forcing the turbulent flow of the fluid and forcing the heat transfer capacity of the heat exchange tube. The other advantage of the corrugated heat exchange tube is that the tube shape that continuously shrinks and expands makes the bellows have the compensation ability, that is, under the action of stress, the corrugated heat exchange tube can freely expand and contract within a certain range.
Diaphragm bellows are pressure measuring elastic elements in pressure measuring instrument. The bellows is used to measure small pressures. The diaphragm is used to measure low pressures up to several megapascals; it can also be used as an isolating component. Under the conditions, the flat diaphragm has the smallest displacement, the corrugated diaphragm is the second, and the bellows is the largest. For larger displacements, several capsules can be connected in series to form a capsule group.
5.Flexible metal conduit
Flexible metal conduit is an important component of modern industrial equipment connection lines. It is used as wires and cables, wire and cable protection tubes for automated instrumentation signals, and civil shower hoses, ranging from 3mm to 150mm.
The above mentioned text is a brief introduction to the five types of the bellows, including the metal bellows, bellows expansion joints, corrugated heat exchange tubes, diaphragm bellows and flexible metal conduit.If you want to know more about this, please contact with henan lanphan. We are willing to provide you as much information as possible. Our email address is the [email protected]