Verdergaar gear pumpIt is a widely used hydraulic pump in hydraulic systems, generally made as a quantitative pump. According to different structures, it is divided into external gear pumps and internal gear pumps, with external gear pumps being more widely used.
Reason for malfunction:
Why does the flow rate of the gear pump not meet the standard?
1) The oil inlet filter is too dirty and lacks oil absorption.
2) The installation height of the pump is higher than the self-priming height of the pump.
3) The oil suction pipe is too thin, causing high oil suction resistance. The typical high oil absorption flow rate is 0.5-1.5m/s.
4) The leakage of the oil suction port joint caused insufficient oil suction of the pump. By observing whether there are bubbles in the fuel tank, it can be determined whether the system is leaking.
Why did the gear pump explode?
The pressure resistance of aluminum alloy gear pumps is 38-45MPa. Without any manufacturing defects, the pump explosion is definitely caused by instantaneous high pressure. main cause:
1) There is a foreign object blocking the oil outlet pipeline, causing an infinite increase in pressure.
2) The pressure adjustment of the safety valve is too high, or the opening and closing characteristics of the safety valve are poor, resulting in delayed response, which makes the Verdergaer gear pump unprotected.
3) If the system uses a multi way directional valve to control the direction, some multi way valves may have negative openings, which may cause damage due to dead point pressure rise.
Why does the gear pump heat up?
1) System overload is mainly manifested in high pressure or speed.
2) Poor oil cleanliness and increased internal wear result in a decrease in volumetric efficiency, causing oil to leak through internal gaps and generate heat through throttling.
3) The oil outlet pipe is too thin and the oil flow rate is too high, generally ranging from 3-8m/s.
Why is there severe noise and pressure fluctuations in Verdergaer gear pumps?
1) The oil filter is clogged with dirt and cannot filter the oil.
2) The oil level is insufficient, the suction position is too high, and the suction pipe is exposed above the oil level.
2) There is no hard object collision caused by paper pads on both sides of the pump body and pump cover. The pump body and pump cover are not sealed vertically, and air is sucked in during rotation.
3) The active shaft of the pump is not concentric with the motor coupling, resulting in twisting friction.
4) The meshing accuracy of the pump gear is insufficient.