In the process of import and export of materials, the left and right sides of the diaphragm force, up to 4800kN, due to continuous alternating force, easy to damage the crack, the diaphragm pump diaphragm design life 8000h, working pressure 6MPa, diaphragm pump diaphragm is easily damaged The reasons are as follows:
Plate heat exchangers can be divided into categories according to their function or characteristics. The most common type is the Plate And Frame Heat Exchanger, which uses gaskets between its plates to create a hermetic seal between them. Another type is the Brazed Plate Heat Exchanger, which is a sealed unit where the plates are joined together by a brazing process. There are also welded plate heat exchangers, involving the use of welding, as well as semi-welded and fully-welded models. Pillow Plate Heat Exchanger consists of two thin metal plates with a herringbone structure on them, the plates are welded together to form a series of interconnected pillow chambers.
Plate heat exchangers are typically used for applications including heating, cooling, heat recovery and condensing, and are especially useful for industrial applications as they are compact. efficient, cost-effective, easy to use and require minima maintenance. Additionally, plate heat exchangers can be used totransfer fluids of different temperatures quickly and in a wide range of flow rates.
Plate heat exchangers are highly suitable for industrial and domestic applications such as air conditioning and refrigeration, radiators and condensers. Oil cooling, chemical processes, food and beverage processing.
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1. The air in the diaphragm chamber is not clean. The volume of the gas changes with the pressure of the propellant and forms a hammer. The local stress of the diaphragm increases and the diaphragm breaks.
2. Because the diaphragm chamber is of a certain volume, if the feeding is unstable and the pressure is low, the material level of the feed compensator is less than 12m. The material level in the voltage stabilizing device is not normal, and the slurry in the pump is separated to form a gap during feeding. Insufficient material, empty pump, hammering or impact, or even cavitation, make the diaphragm subjected to increased stress, increase the frequency, cause diaphragm fatigue damage or breakdown.
3. The feed contains 3-8mm stones or large pieces of material and the mass percentage of the solids in the slurry exceeds 2%, causing a valve to be trapped, causing pump pressure to fluctuate, or due to the valve cone being misaligned when the valve is assembled, causing a thorn valve, resulting in The momentary strain of the diaphragm increases; it causes rupture.
4. The feed temperature exceeds the specified 100°C, accelerating the aging of the separator, and at the same time, steam bubbles are generated in the slurry. When the gas enters the diaphragm chamber or the unloading valve leaks, the pressure of the propelling fluid decreases, both causing uneven force distribution and fatigue damage to the diaphragm.
5. The feeding and discharging of the diaphragm chamber is controlled by the probe detecting the position of the control lever. If the magnetism of the magnetic ring on the control lever is weak, the probe cannot detect the signal, and the oil cannot be filled in time, resulting in excessive force on one side of the diaphragm. And it broke.
6. Diaphragm control rod bearing sleeve wear is serious, so that the control rod eccentric, sink, diaphragm force increases, easy to pull the split diaphragm.
7. The differential pressure of the unit caused the diaphragm pump to overpressure, and the diaphragm suffered a rupture due to an increase in instantaneous force.
8. Cross head, piston or cylinder liner lining loose, piston head hammer caused by incorrect installation of crosshead guide rails, crosshead bearings, etc. will cause hydraulic imbalance; frequent pump trips will also cause the diaphragm to be subjected to extreme force momentarily. The diaphragm ruptured.
9. The nitrogen package is precharged with 2.2 MPa of nitrogen and has a good damping effect. During operation, the pressure reflected on the pressure gauge is the operating pressure rather than the pressure of the nitrogen package (only visible when the pump is stopped). If the nitrogen package is damaged or the pressure is reduced during operation, the diaphragm pump will operate without damping, which will result in Hydraulic imbalance, diaphragm easy to damage and damage.
10. The diaphragm itself has poor quality, no elasticity, and low material strength.