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Failure Of The Diaphragm Pump During Operation

- May 16, 2018 -

Through  careful observation of the working process of the diaphragm pump, it  was found that when the working pressure exceeds 0.9 MPa, the vibration  of the pump is great, and the amplitude of vibration of the output pipe  is large. At  this time, the inlet pressure of the buffer pressure relief device of  the inlet of the adjustment pipeline and the pressure-reducing pressure  tank on the outlet pipeline can not eliminate the vibration, and the  foundation of the pump and the brackets of the fixed pipeline are all  loosened for a long time, and the pump also follows the certain time. Shake and damage. After  dismantling the pump, the diaphragm is damaged. The reason is that the  diaphragm is pushed out of the limit position by the diaphragm  connecting rod, which causes damage to the center of the diaphragm and  the connecting rod of the diaphragm. The diaphragm connecting rod is  thus deformed and can no longer be used. The piston rod assembly is due  to the piston rod. The  damage of the silk mouth caused the two fixing nuts to fall off, and  the piston rod was also scrapped; the cylinder sleeve and the piston  were mainly worn too much and caused the pressure to go up.

According  to the results of the maintenance of the diaphragm pump, it was mainly  because the manufacturer did not design according to the best working  conditions of the pump when programming the pump. The  occurrence of faults is due to the high speed of the pump during the  high pressure operation. Therefore, the cause of the pump must be  checked. The  principle of electrical control of the diaphragm pump is as follows:  Pressure signals from the inlet of the plate frame are taken to the  Siemens S7-300 PLC, and a 4 to 20 mA analog current signal is sent to  the frequency converter to control the operating speed of the diaphragm  pump. The frequency is between 4Hz and 80Hz). Nothing is wrong with the surface of the pump. As the pressure rises, the speed of the diaphragm pump slowly decreases. Through  the programming software, the block inspection of the control pump is  called out and the entire process of the diaphragm pump operation is  detected on-line.

When  the pressure is 0~0.7MPa, the output frequency of the inverter is 80Hz;  when the pressure rises from 0.7MPa to 1.0MPa, the output frequency of  the inverter drops from 80Hz to 40Hz; when the pressure is 1.0~1.3MPa,  the inverter The  output frequency is always maintained at 40Hz. At this time, the  vibration of the diaphragm pump is observed to increase. The output  pressure oscillates between 0.9 and 1.4 MPa. The piping and the soft  pipe at the outlet of the pump fluctuate by a large margin; the pressure  is from 1.3. When  MPa rises to 1.4MPa, the output frequency of the frequency inverter  drops from 40Hz to 8Hz. This pressure is the normal use pressure. At  this time, the vibration of the diaphragm pump and the pump outlet and  the pipe and the soft pipe joint jitter are basically absent until the  diaphragm pump stops working. A loop. When  the working pressure is 1.0 ~ 1.3MPa, the diaphragm pump operating  speed is too fast, that is, the frequency of the pump's piston back and  forth is too fast, resulting in the diaphragm on both sides under high  pressure force exceeds the limit, the whole pump body vibration  increases, so that Diaphragm pumps produced more failures and accessories were damaged abnormally.

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