Reasons of oil pump being overheated
Time:2021-02-25
Views:2743
There are two reasons for the overheating of the hydraulic pump of a hydraulic press. One is heat generated by mechanical friction. Since the moving surface is in a state of dry friction or semi-dry friction, the moving parts rub against each other to generate heat. The second is heat generated by liquid friction. The high-pressure oil leaks into the low-pressure cavity through various gaps, and a large amount of hydraulic energy loss is converted into heat energy.
Therefore, the correct selection of the gap between the moving parts, the oil tank volume and the cooler can prevent the excessive heating of the pump and the excessive oil temperature. In addition, the clogging of the oil return filter will cause the oil return back pressure to be too high, which will also cause the oil temperature to be too high and the pump body to overheat.
The main reasons for the oil leakage of the plunger pump of the variable plunger pump are as follows:
(1) The main shaft oil seal 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 too long, causing oil leakage at the seal;
(4) The external oil pipe of the pump is loose, the pipe joint is damaged, the gasket is aged or cracked;
(5) The bolts of the variable adjustment mechanism are loose and the seal is damaged;
(6) Cast iron pump casing has blisters or poor welding.
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