Electric Diaphragm Pump Troubleshooting

The electric diaphragm pump is a relatively new type of mechanical transportation equipment. It has the advantages of no need for irrigation and water diversion, strong self-priming ability, high pressure, low vibration, arbitrary flow adjustment, and can transport flammable, volatile, and acid-corrosive liquids. Therefore, electric operated diaphragm pump is often used in petrochemical, ceramics, metallurgy and other industries, and occupies a certain leading position in spray painting and ceramics. Next we will troubleshoot the EODD pump.

Electric diaphragm pump engine temperature is too high.

The cooling system is leaking or the cooling water is insufficient.
The water temperature indicator indicates inaccurate or failed.
The scale of the cooling system is too large and the heat dissipation is poor.
The radiator shield net or radiator core air channel is blocked by debris, resulting in poor heat dissipation.
The pump and fan belts are too loose or damaged.
The pump is damaged, the fan blades are reversed or deformed, and the air ring is damaged.
The thermostat is damaged in the closed position of the main valve.
The engine is overloaded for a long time, and the fuel supply time is too late.

Electric diaphragm pump can't pump water.

There is air in the water inlet pipe and pump body of the electric diaphragm pump.

Some users do not fill enough water before starting; sometimes it seems that the filled water has overflowed from the exhaust hole, but the pump shaft does not rotate, and the air is completely discharged, resulting in a small amount of air remaining in the inlet pipe or pump body.
The end connected to the inlet of the pump is higher and not completely horizontal. If it is tilted upwards, air will be trapped in the inlet pipe, reducing the vacuum in the water pipe and pump, and affecting the water absorption rate.
The gasket of the electric diaphragm pump is worn out due to long-term use or the gasket is too loose, resulting in a large amount of water sprayed from the gap between the gasket and the shaft sleeve of the electric diaphragm pump. As a result, outside air enters the inside of the water pump from these gaps. Affects pumping.
Due to the long-term submersion, after the diaphragm pump works, there are corrosion holes on the pipe wall, and the water surface continuously drops. When these holes are exposed to the water, air enters the intake duct from the holes.
There are cracks at the elbow of the water inlet pipe, and the gap between the water inlet pipe and the water pump is very small, which may cause air to enter the water inlet pipe.

Electric diaphragm pump speed is too low.

Human factors. Due to the damage of the original motor, quite a number of users arbitrarily equip another motor to drive. As a result, the flow rate is low, the head is low, and water cannot even be pumped.
The drive belt is worn. There are many large water separation pumps that use belt drives. With prolonged use, the drive belt wears and becomes loose and slips, reducing the speed of the pump.
Improper installation. The center distance between the two pulleys is too small or the two shafts are not parallel, on which the tight side of the drive belt is installed, resulting in a too small wrap angle, errors in the calculation of the diameters of the two pulleys, and Large eccentricities of the two shafts will cause variations in pump speed.
Mechanical failure of the electric diaphragm pump itself. The fixed nut of the impeller and the pump shaft is loose or the pump shaft is deformed and bent, causing the impeller to move too much, directly rubbing the pump body or bearing damage, which may reduce the speed of the electric diaphragm pump.

Diaphragm of diaphragm pump is broken.

There are solid particles in the middle of the medium. The higher the abrasiveness of the particles, the faster the diaphragm wears.
The air source pressure is unstable, which will make the frequency conversion of the diaphragm unstable back and forth.
The diaphragm of the diaphragm pump itself is not of good quality, has no elasticity and the strength of the material is also very low.
The pressure of import and export suddenly increased.
The diaphragm is damaged due to the impact of the granular or sharp material being sucked in.

The outlet pipe of the electric diaphragm pump vibrates greatly.

The electric diaphragm pump vibrates violently. It may be the electric rotor is unbalanced, or the coupling is poorly combined, the bearing is worn and bent, of course, some rotating parts may be loose or cracked, and it may be due to the instability of the pipe support, etc. It is recommended to adjust and repair.
Water or air leaks in pipes. The nuts may not be tightened when installed. If the leakage is not serious, the places with air leakage or water leakage can be coated with cement or cement slurry mixed with asphalt oil. Temporary repairs can be made with wet mud or soft soap. If water leaks at the fitting, hand tighten the nut. If the leak is serious, it must be disassembled again.
Overheating of the packing. Because the packing is pressed too tightly, the cooling water cannot enter the packing, or the shaft surface is damaged. Appropriate measures such as loosening the packing and removing the blockage of the sealing tube can be taken. Packing wear must be replaced with new ones. Before installation, they should be soaked in oil and installed one by one. The incisions should be staggered to reduce leakage. After the packing is installed, the gland should be tightened and the tightness should be adjusted during operation.

Electric diaphragm pump does not move or operates very slowly.

Check the filter screen or air filter device at the air inlet end for impurities.
Check whether the air valve is stuck and clean the air valve with cleaning fluid.
Check whether the air valve is worn and replace with new parts if necessary.
Check the condition of the sealing parts of the central body. If it is seriously worn, the sealing effect cannot be achieved, and the air will be discharged from the air outlet end.
Check whether the piston movement in the air valve is normal.
Check the type of lubricating oil. If the added oil is higher than the recommended oil viscosity, the piston may seize or not function properly. Lightweight and antifreeze lubricants are recommended.

The pump operates, but the flow is small or no liquid is flowing out at all.

Check the cavitation of the pump and reduce the speed of the pump to allow the liquid to enter the liquid chamber.
Check whether the valve ball is stuck. If the operating fluid is incompatible with the elastomer of the pump, the elastomer will swell. Please replace the elastomer with an appropriate material.
Check whether the joint of the pump inlet is completely locked and leak-proof, especially the clamp near the valve ball at the inlet end needs to be locked.

The outlet liquid contains a lot of air bubbles.

Please check whether the diaphragm is broken.
Check the pump body and pipeline for leakage.