Metal corrugated pipe specifications
Article : Ludun
Time : 2015-10-08
PV：
Metal corrugated pipe is use roll mill with galvanized or not galvanized steelskin belt made by the pressure wave, spiral fold bite, with light weight, good stiffness, bending is convenient, simple connection, the advantages of small friction coefficient and the concrete has a good bonding effect, is the post-tensioned prestressed concrete hole forming, with the ideal material specifications (inner diameter) : 50, 55, 65, 70, 75, 80, 90, 100 mm, etc.2. The performance parameters of metal bellows
1) under the effect of external force, the maximum compression length have been compressed into corrugated metal corrugated pipe between the length of close contact with each other.
2) the maximum compression displacement of metal corrugated pipe compression to close contact with each other between corrugated will have the biggest displacement.When bellows maximum compression displacement, often have produced plastic deformation, so when the work is not allowed to reach this value.
3) allows the displacement and displacement of metal corrugated pipe does not produce plastic deformation work conditions can achieve the maximal displacement said allowing displacement, and the working process of the displacement of the maximal displacement of your work.In order to keep the corrugated tube in the process of the whole work stable and reliable performance and high service life and work as a displacement allowed displacement of 40% ~ 50%.
4) resistance to stress and working pressure bellows in a stable state or do not produce plastic deformation (such as wave from homogeneity not to undermine, corrugated not skew, etc.), can withstand the maximum static pressure said bellows pressure resistance.And work pressure refers to the whole working process, to bear the biggest jade force in order to guarantee the bellows work performance is stable and reliable and has high service life, work pressure generally in 40% ~ 50% of resistance to pressure.
5) fracture pressure bellows tube wall rupture caused by damage to the critical pressure of fracture pressure, it represents the maximum compression strength of corrugated pipe.In the process of work, the work stress of bellows is far less than the pressure.
6) stiffness and stiffness sensitivity is metal corrugated pipe unit displacement required force or pressure, and the sensitivity is the reciprocal of stiffness, the unit of force or pressure acting on the corrugated tube produced by the displacement.Because of the corrugated tube can withstand the force, stress and bending moment in the set, so its stiffness depending on the load bearing categories can be divided into concentrated force stiffness, stress, stiffness and bending stiffness.Of which the most concentrated force stiffness in common use, it is referred to as "for the stiffness of the bellows.
7) effective area it characterization of metal bellows converts pressure to a concentrated force ability, the effective area is an equivalent area, pressure axial force in this area will be equal.
8) stability of metal corrugated pipe under the action of external force, resistance to lead to the unstability of the local buckling or overall ability.
9) sealing refers to metal bellows under certain internal and external pressure difference is to ensure no leakage performance, corrugated pipe must have a seal.
10) live the life of the metal corrugated pipe, corrugated pipe until don't seal leakage when the number of load change.Life is a function of many variables. It displacement and corrugated pipe work, working pressure, working medium, temperature, rigidity, frequency range, technological factors, installation conditions and material properties and so on.
11) zero offset with free length is zero, in under the action of concentrated load, to squeeze the corrugated tube to a displacement value, maintain a minute later, loading, unloading and with corrugated pipe length and the free length, its difference according to the zero offset.It is related to material properties and the size of the displacement.
12) of a point on the elastic characteristics of metal bellows according to the relationship between elastic deformation and load characteristics.Can be linear elastic properties, may also be nonlinear.Bellows nonlinear elastic properties depend on its geometry shape and displacement.Linear deviation by values of nonlinearity, nonlinear degree of value refers to the actual maximum deviation of linear elastic characteristic curve and the ratio of the maximum deformation of bellows.
13) lag the lagging of metal bellows, were drawn under the qian conditions of loading and unloading characteristic curve of elasticity and elastic hysteresis value is measured by the same load under the action of loading and unloading of the maximum differential displacement and maximum displacement ratios.
14) elastic aftereffect springback of metal corrugated pipe is displacement of the corrugated pipe load late than.Due to springback phenomenon, for example, the instrument pointer after unloading load can't immediately return to zero.
Metal corrugated pipe is a kind of flexible, thin wall, a transverse corrugated tube and shell parts.It there are both elastic properties and sealing characteristics, under the action of external force and moment can produce axial, angular, lateral, and their combination displacement, sealed performance is good.In machinery, instruments, oil, chemical, electricity, heating, locomotives, ships, nuclear industry, aerospace and many other industrial fields has been more and more widely used.
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