The important significance of the shock proof of the expansion joint of the bellows in Guizhou
The anti vibration of the expansion joint pipe system is a very complicated engineering problem。 The bellows manufacturer in Guizhou should make the three parts of the expansion joint free vibration frequency, the excitation frequency of the machine and the natural frequency of the gas column in principle。
1, change the size, material, temperature, end condition and pre deformation of the bellows, and adjust the vibration frequency of the expansion joint.
2. The method of adding pipe support is used to change the natural frequency of the pipe system.
3, by changing the natural frequency to change the length of the air column.
Must pay attention to, because the pressure pulse can flow through the medium is transferred to the expansion joint outside, therefore, when the system vibration is caused by the pressure pulse, can not use the method section, add supporting pipeline and bundled reinforcement expansion to eliminate, should consider installing buffer and damper, so that the low frequency and high amplitude pulse vibration into less violent than high frequency and low amplitude.
The metal expansion joint can be used in high frequency and low amplitude vibration situations, but it is not suitable for low frequency and high amplitude vibration situations, such as piston compressor, diesel engine and so on, because this vibration will increase the maximum stress of expansion joint. When the internal pressure is satisfied, the wall thickness of the bellows should be small, in order to reduce the natural frequency, increase the flexibility and reduce the load.
When bellows manufacturers in Guizhou have installed expansion joints on machine driven pipes, one end of the expansion joints should be as close as possible to the machine, while the pipes connected to the other end of the expansion joints should be fixed as close as possible to the expansion joints. Because the fixed point is too far away from the expansion joint, the pipe between the expansion joint and the fixed point becomes a cantilever beam, so that it can not only absorb vibration, but also increase the vibration of the expansion joint, and shorten its service life.
When the flow velocity is high, the turbulence in the bellows, or the turbulence formed at the upper reaches of the bellows, can cause vibration。 In order to reduce the vibration, the built-in sleeve should be set in the bellows。