The structure of pneumatic diaphragm pumps is similar, so the problems that occur are similar.
Pneumatic diaphragm pumps are increasingly widely used to be accepted by the public. In many enterprises such as chemical, spray painting, ceramic and other factories, there are many diaphragm pumps. Diaphragm pumps can be roughly divided into two categories: electric diaphragm pumps and pneumatic diaphragm pumps. And pneumatic diaphragm pumps are most commonly used. So here, let me talk about some maintenance tips for pneumatic diaphragm pumps. I hope it can be helpful to equipment maintenance personnel.
1. The pump is weak and the pumping speed slows down. This phenomenon generally occurs in the following situations: firstly, the air source pressure decreases. First, take a look at the pressure on the intake pressure gauge. A pressure value of 4-7 kilograms is considered normal. Then check the opening position of the air source valve. If an electromagnetic valve is used for the opening and closing of the air source, check if the plastic valve plate of the electromagnetic valve is damaged, which may cause the plastic valve plate to not fully open. The second issue is the blockage of the muffler, which prevents the rapid discharge of air and slows down the pumping speed. The third issue is excessive water or impurities in compressed air. After entering the diaphragm pump gas distribution valve, block the air inlet or jam the valve core. The fourth issue is that the upper and lower covers of the distribution valve are damaged and leak due to prolonged impact from the valve core. The fifth reason is that the four sealing rings on the inner shaft of the pump are worn and there is gas leakage.
2. Reduced traffic. This phenomenon generally occurs in the following situations: firstly, the wear of the inlet and outlet one-way valves (plastic balls) decreases. Or there may be strip-shaped objects, large particles getting stuck in plastic balls. Causing the material liquid to flow back into the discharge port during suction, and then pressing the material back from the feed port during discharge. The second is that the diaphragm is constantly stretched and deformed, resulting in a decrease in the volume of the material chamber. The third one is black, and the thick membrane is damaged. Unable to move properly when driven by the central axis.
3. The pump does not move. There may be several situations where this phenomenon occurs. One is that the valve core is severely worn and stuck. The second is the wear of the shaft sleeve of the central shaft. At this time, the copper sleeve should be replaced. The third reason is that the screws at both ends of the central shaft fall off. The fourth issue is that both layers of membranes have ruptured. The fifth is to invert or lay the diaphragm pump flat. Valve core cannot return (first and second generation)
4. There are impurities or oil stains inside the material. This is usually caused by membrane rupture.
5. Leakage of materials at the import and export. One is that the screw is not tightened, the second is that the ball seat is deformed or the O-ring is damaged, and the third is that the pump casings at both ends are not aligned with the hole positions and tilt, resulting in the two discharge or inlet ports not being on the same plane.