The metal hose is a pipe fitting for conveying various fluids of the corrugated pipe core component, and its working property is to compensate in the connection between the pipe and the pipe, the pipe and the device, and the device and the device. The metal hose uses its bending disturbance to compensate for the positional deviation caused by the installation of the piping system, and to bear the relative displacement required for the two broken joints to work very well. In some piping systems, it also acts to reduce vibration and eliminate noise.
 For outer armored wire or machine woven mesh sleeves, ring-shaped or spiral-shaped bellows with a length-to-length ratio greater than or equal to 3 are called metal hoses. In Europe and the United States, it is customary to call its Flexible Tube, Corrugated Hose or Flexible Metal Hose.
There are many classification methods for metal hoses, which are classified according to whether they are corrosion-resistant: stainless steel is corrosion-resistant, carbon steel is not corrosion-resistant; according to the combination of assembly: mechanical clamping is machine clamp The welding combination is welded; according to the pressure level: for the mechanical manufacturing industry: 0-2.5Mpa for low pressure, 2.5-16Mpa for medium pressure, and 16-32Mpa for high pressure. For the petrochemical industry, 0-1.6Mpa is low-pressure, 1.6-10Mpa is medium-pressure, 10-100Mpa is high-pressure; according to service scope: aerospace, aviation, shipbuilding, nuclear, Petrochemical, steel, construction, light industry; according to the connection form: ball head, take over, flange, taper pipe thread type quick joints and so on.
In complex piping systems, there are often difficulties due to space position conditions, resulting in installation difficulties. The formed tubes cannot be loaded, bent over, and come over, and the installed tubes will not be avoided. Local cold correction. Depending on the pipe diameter and the specific conditions on site, the amount of cold correction ranges from a few millimeters to tens of millimeters, and some hundreds of millimeters. Practice has proved that the larger the amount, the higher the internal stress, and the installation stress of these residues in the pipeline system is undoubtedly a great hidden danger. Since the metal hose can be bent at will and the internal stress generated by bending under the rated bending radius is extremely small, it can greatly facilitate the installation work to the safe operation of the pipeline system. This is the main reason why some piping systems must use metal hoses.
The refueling of automobiles, trains and airplanes, the injection tank of acetylene gas liquefied gas, the operation of the paper machine, the drying drum of the dyeing machine, etc. all have the problem of displacement compensation, which needs to be solved by flexible pipes. According to the old design ideas, most of them use copper serpentine tubes or rubber tubes. Because of their different degrees of problems, they often cause difficulties in industrial production and maintenance. The good overall performance of the metal hose is fully reflected here. In the general industrial field, in addition to pressure and temperature, there are often harsh conditions such as fatigue, corrosion, vibration, pressure, impact, etc. Under such circumstances, the use of metal hoses to compensate for the positional movement of the pipe is The most suitable.
Compression of vibration under the operating conditions of mechanical equipment may cause early failure of components on its weak links. If the vibration is conducted outward along the pipeline, resonance of the system may occur, causing other components to be damaged. Not only that, but the noise generated by vibration will also have a great impact on people's physical and mental health. Therefore, controlling the vibration of the equipment under operating conditions and preventing it from conducting outward along the pipeline is an important key to the design of the compression machine.
The correct installation of metal hoses has a great impact on their safe use. In practical engineering applications, incorrect installation may not only cause early failure of the metal hose, but may also cause major personal equipment accidents and product quality accidents. Therefore, during the installation and use of the metal hose, strong twisting, strong pulling, friction, collision, acting as a steel cable lifting heavy object, the crowbar exerting force directly on the flexible section and the like can be avoided.