There are two reasons for the overdistribution of heat in the plunger pump, one is the frictional heat generation of the machine. Since the active appearance is in a dry friction or semi-dry friction state, the moving parts rub against each other to generate heat. The second is liquid friction heat. The high-pressure oil leaks into the low-pressure cavity through various loopholes, and a large amount of hydraulic energy is lost and converted into heat energy. By accurately selecting the gap between the moving parts, the tank volume and the cooler, the signs of overheating and excessive oil temperature of the pump can be eliminated. In addition, the oil return filter is blocked and the back pressure of the oil return is too high, which will also cause the oil temperature to be too high and the pump body to overheat.
The oil leakage of the plunger pump is important for the following reasons: (1) the oil seal of the spindle is damaged or the shaft is defective or scratched; (2) the internal leakage is too large, causing the pressure at the oil seal to increase, and the oil seal is damaged or flushed out; (3) the oil drain pipe is too thin and long, so that the oil leakage at the seal; (4) the external oil pipe of the pump is loose, the pipe is damaged, and the sealing gasket is aged or cracked; (5) the bolt of the variable adjustment mechanism is loose and the seal is damaged; (6) the cast iron pump casing has sand holes or poor welding.
