What Is a Corrugated Pipe?

The corrugated tube refers to a tubular elastic sensitive element connected by a foldable wrinkle sheet in a folding and stretching direction. Bellows are widely used in instrumentation. The main purpose is to be used as a measuring element of pressure measuring instruments to convert pressure into displacement or force. The bellows has a thin wall and high sensitivity, and the measurement range is from tens of Pascals to tens of Megapascals. Its open end is fixed, the sealed end is in a free state, and the auxiliary coil spring or reed is used to increase elasticity. During work, it is extended along the length of the tube under the effect of internal pressure, so that the movable end has a displacement that has a certain relationship with the pressure. Moving the pointer on the movable end can directly indicate the amount of pressure. The bellows is often combined with a displacement sensor to form a pressure sensor that outputs electrical energy, and is sometimes used as an isolation element. Since the expansion of the bellows requires a large volume change, its response speed is lower than that of the Bourdon tube. Bellows are suitable for measuring low pressure.

Bellows

Bellows mainly include

Application of metal bellows ^[1] and finned bellows in internal combustion engine coolers, install 1-1000 metal ripples with discontinuous convex and concave shapes in the cooler shell of gasoline and diesel engines or between the two tube plates of the cooling core The tube is fixed to a tube plate at one end by a method such as a tube expansion method or a welding method, so that the flow state of the cooling medium is changed, so as to improve the heat transfer coefficient and increase the heat transfer efficiency. The invention is novel in concept, practical in process, low in cost, reliable in performance, high in heat transfer efficiency, non-scaling, long in service life, and low in thermal stress.

1. Pressure According to the actual working pressure of the hose, check the nominal diameter and pressure gauge of the corrugation to decide whether to use the stainless steel mesh sleeve type.

2. The nominal diameter of the size hose, the type of joint (mainly flange connection, screw connection, quick joint connection) and size, hose length.

3. State According to the state of the hose, refer to the correct use and installation method of the metal hose and the optimal length of the hose during settlement compensation. The calculation of the length of the hose in various motion states, the minimum number of bending times and the minimum bending radius of the hose, etc. The parameters correctly select the length of the hose and install it correctly.

4. Temperature The working temperature and range of the medium in the hose; the ambient temperature when the hose is working. When the temperature is high, the temperature correction coefficient of the working pressure of the metal bellows at high temperature must be used to determine the pressure after the temperature correction to determine the correct pressure level.

5. The chemical properties of the medium conveyed in the media hose, according to the corrosion resistance parameter table of the hose material, determine the material of the hose parts.

6.Vacuum hose is mainly used in monocrystalline silicon production to achieve negative vacuum

Mainly used in steel belts

Steel strip corrugated pipe is also called steel strip reinforced polyethylene spiral corrugated pipe. It is a winding structure wall pipe with high density polyethylene (PE) as the matrix (inner and outer layer) and surface coated with adhesive resin steel strip. The tube wall structure consists of three layers: the inner layer is a continuous solid-wall PE inner layer tube, and the inner layer tube is wound with a ring-shaped corrugated steel strip reinforcement (formed with a steel plate into a "V" shape) outside the corrugated steel strip The outer layer of polyethylene is compounded to form a whole spiral corrugated pipe. Its typical structure is shown in the figure. The modulus of elasticity of steel is nearly 200 times that of polyethylene (the modulus of elasticity of carbon steel ^[2] is about 190,000 MPa). Combining the advantages of metal and plastic is obviously an ideal way to achieve high rigidity and low consumption. High rigidity, high strength and the excellent characteristics of plastics such as corrosion resistance, abrasion resistance and flexibility are organically combined to give play to the advantages of both aspects, make up for the shortcomings of both aspects, and realize the unification of high performance and low cost.