Recommend high-quality hydraulic products daily: Rexroth plunger pump spot special price
OTT-JAKOBHS-A/E63-B/F80-B-DA=367Snr:956003326 Work clamp plunger pump pipe joint size There are two reasons for the excessive heating of the hydraulic pump, one is the 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 volume of the fuel tank and the cooler can prevent the excessive heating of the pump and the phenomenon of excessive oil temperature.
In addition, the clogging of the return oil filter causes the return oil back pressure to be too high, which will also cause the oil temperature to be too high and the pump body to overheat.
Parameters and principles:
However, when the water temperature is below 20℃, the saturated steam pressure can be ignored
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The main reasons for the oil leakage of the plunger pump are as follows: the main shaft oil seal is damaged or the shaft is defective or scratched.
The main reasons for the oil leakage of the plunger pump are as follows: the internal leakage is too large, which causes the pressure at the oil seal to increase, and the oil seal is damaged or rushed out.
The main reasons for the oil leakage of the plunger pump are as follows: the oil drain pipe is too thin and too long, causing oil leakage at the seal.
The main reasons for the oil leakage of the plunger pump are as follows: the external oil pipe of the pump is loose, the pipe joint is damaged, and the gasket is aged or cracked.
The main reasons for the oil leakage of the plunger pump are as follows: the bolts of the variable adjustment mechanism are loose, and the seal is damaged.
The main reasons for the oil leakage of the plunger pump are as follows: the cast iron pump casing has blisters or poor welding.
The mechanical principle of Rexroth oil pump: When the plunger pump is working, the cam on the camshaft of the fuel injection pump and the plunger spring force the plunger to reciprocate up and down to complete the oil pumping task. The oil pumping process can be divided into the following three Stages.
The total stroke L of the reciprocating movement of the plunger of the Rexroth plunger pump is unchanged by the lift of the cam.
The amount of oil supplied by the plunger per cycle depends on the oil supply stroke. The oil supply stroke is not controlled by the camshaft and is variable. The start time of the oil supply does not change with the change of the oil supply stroke. Rotating the plunger can change the end time of the fuel supply.
Oil intake process: under the action of spring force, when the protrusion of the cam is partially turned, the plunger moves downwards, and the upper space of the plunger (called the pump oil chamber) has a vacuum degree. When the upper end of the plunger sets the plunger sleeve After the upper oil inlet hole is opened, the diesel oil filled in the upper body oil passage of the oil pump enters the pump oil chamber through the oil hole, the plunger moves to the bottom dead center, and the oil inlet ends.
Fuel supply process: the plunger spring is compressed. When the camshaft turns to the convex part of the cam to lift up the roller body, the plunger moves upwards, the fuel is compressed, and a part of the fuel flows back to the upper body oil cavity of the fuel injection pump through the oil hole.
A small failure of the oil pump has a different impact on each gear, and the impact on low gears is greater than that on high gears.
The above content is compiled and released by Wuhan Hengmeisi!
Wuhan Hengmeisi Hydraulic Electromechanical Equipment Co., Ltd. Xing’an League Rexroth guide quote: