In the import and export of material in the process of the diaphragm around both sides of the force, the maximum 4800kN, due to the continuous alternating force, easy to damage and cracking, the diaphragm design life of 8000h diaphragm pump, the working pressure is 6MPa, the reason is easy to damage the pump diaphragm are as follows:
The 1. air chamber is not clean, the gas volume varies with the change of liquid pressure, promote the formation of air hammer, diaphragm local stress increases, the diaphragm will break.
2. of the diaphragm chamber volume, if the feed is not stable, low pressure, the feed compensator level below 1 2m, voltage stabilizing device the material level is not normal, slurry separation gap is formed in the pump feed, cause the lack of material, air pump, impact hammer or even produce cavitation, increasing so, under the diaphragm stress frequency increases, causing the diaphragm fatigue damage or breakdown.
3. feed containing 3-8mm pebbles or solid bulk material and slurry mass percentage of more than 2%, caused by card valve, resulting in pump pressure fluctuations, or because the valve assembly, valve cone positioning, caused by stab valve, diaphragm causing momentary force increase caused by rupture.
4., the feed temperature exceeds the specified 100 degrees, accelerating the diaphragm aging. At the same time, the bubble is generated in the slurry, and when the gas enters the diaphragm chamber or the unloading valve leaks, the pressure of the advancing liquid decreases, which results in the uneven stress and fatigue damage of the diaphragm.
5., the feed and discharge of the diaphragm chamber is controlled by the position number of the probe control rod. If the magnetic ring of the control rod is weak, the probe can not detect the signal, so it cannot fill the oil in time, resulting in the rupture of the diaphragm on one side.
The supporting sleeve of the 6. diaphragm control rod is badly worn, which makes the control rod eccentric and sinking, the force of the diaphragm is increased, and the diaphragm is easily cracked.
The pressure difference of the 7. unit caused the overpressure of the diaphragm pump, and the diaphragm was subjected to the increase of the instantaneous force to cause the rupture.
8., the crosshead, piston or cylinder liner loosening, cross head rail and crosshead bearings are not installed correctly, causing the hammer to blow, will make the hydraulic imbalance. Pump frequent jump and stop will also make the diaphragm instantaneous force reach the limit, resulting in diaphragm rupture.
9. nitrogen package prefilled 2. 2MPa nitrogen, which has better damping effect. Operation when the pressure gauge pressure is reflected on the operating pressure rather than nitrogen pressure (packet only when the pump stops to see if the operation), the package is damaged or nitrogen pressure decreased in diaphragm pump without damping condition, will cause the hydraulic imbalance, prone to hit and damage the diaphragm.
10. the diaphragm is poor in its quality, inelastic and low in strength.
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