Regarding the problem that the diaphragm pump does not supply enough oil when it is short of oil
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I heard from an old technician that the diaphragm pump would not be able to provide adequate lubricating oil when there is a lack of lubricating oil. I tested it today and found that this was indeed the case. Shouldn't the diaphragm pump itself use the deformation of the diaphragm to produce volume and pressure changes to transport liquid? Could you please tell me the reason? Thanks...
There may be a lack of lubricating oil causing the piston to not move properly.
It must be a lack of hydraulic oil, right? Or your pump has hydraulic oil and lubricating oil together. If there is just a simple lack of lubricating oil, it should be dry grinding of mechanical transmission parts.
If the diaphragm pump is short of lubricating oil or the liquid level is too low, air will enter, causing air blockage, and eventually the pump will not pump liquid.
I don't think it's possible. I hope the poster can tell me the reason.
This is a hydraulic diaphragm pump. The working principle is that the plunger pushes a certain volume of hydraulic oil, and the volume change generated by the plunger is transmitted to the diaphragm through the lubricating oil. Finally, the volume change in the pump chamber is caused by the diaphragm to reach the inlet and outlet of the hydraulic diaphragm pump. If the hydraulic oil is insufficient, part of the volume in the oil chamber will be replaced by air. Air is a compressible gas, resulting in a decrease in the volume change in the pump chamber, and the metering pump will not feed or will not feed enough.
“The diaphragm pump will fail to measure when there is a lack of lubricating oil. That is for sure, because the plunger of the hydraulic diaphragm metering pump does not directly exert force on the diaphragm. It is through the hydraulic oil as a medium that the plunger twitches back and forth, causing the diaphragm to move with it to achieve the suction and discharge function. Only then can there be flow.
It should be a hydraulic diaphragm pump. Lack of oil causes the diaphragm to have insufficient stroke or no stroke, so it will naturally not be measured.
The basic principles of both diaphragm metering pumps and diaphragm compressors are similar, they are divided into oil chamber and air chamber, but diaphragm compressor is divided into three chambers, oil chamber, air chamber and intermediate chamber. The basic principle is to rely on the plunger to push the oil, causing the diaphragm to deform, so that the gas on the gas side obtains a certain pressure. If there is insufficient oil, some gas will be mixed in the oil chamber, and the gas is compressible, which means the pressure is relatively large. When the piston stroke is constant, part of the piston force is consumed by gas compression, resulting in small deformation of the diaphragm, resulting in smaller pressure on the gas, and of course the flow rate becomes smaller. I wonder if it’s clear?
He should be talking about a double diaphragm. The space between the two diaphragms should be filled with lubricating oil. Because the liquid is incompressible, the volume change of the reciprocating movement of the plunger is transmitted to the front of the diaphragm, thereby sucking and discharging the medium. If there is a lack of lubricating oil, gas will enter between the two diaphragms. The reciprocating movement of the plunger will compress the gas, which cannot be transmitted to the front of the diaphragm, so it cannot be measured.