What are the common faults of hydraulic gear pumps? Why are these failures occurring? Dalan Hydraulic Xiaobian will analyze it with you.
What are the common faults of hydraulic gear pumps? Why are these failures occurring? Dalan Hydraulic Xiaobian will analyze it with you. The main common faults are as follows:
1, the pump does not produce oil
1 In the hydraulic system debugging, it is found that the gear pump does not produce oil. First, check whether the rotation direction of the gear pump is correct.
2 Gear pump has the left turn and the right turn. If the direction of rotation is wrong, the pressure oil formed by the difference in volume generated by the internal gear meshing will cause the oil seal to be damaged and leak oil.
3 Check if the oil filter at the oil inlet end of the gear pump is blocked, which will cause difficulty in oil absorption or oil absorption, and the phenomenon that the oil suction hose is sucked up.
2, fever
1 hydraulic system overload, mainly in the pressure or speed is too high.
2 The cleanliness of the oil is poor, the internal wear is intensified, the volumetric efficiency is lowered, and the oil leaks from the internal gap to generate heat.
3 The oil discharge pipe is too fine, the oil flow rate is too high, and the general oil flow rate is 3-8 m/s.
3, the oil seal is punched out
1 The gear pump rotates in the wrong direction. When the rotation direction of the pump is not correct, the high-pressure oil will directly pass to the oil seal. Since the low-pressure skeleton oil seal can only withstand a pressure of 0.5 MPa at most, the oil seal will be flushed out.
2 Gear pump bearings are subjected to axial forces. The axial force is often related to the over-tightening of the gear pump shaft extension end and the coupling sleeve, that is, the pump is hammered by a hammer or hardened by a mounting screw to receive a backward axial force when the pump is installed. This backward axial force will force the wear in the pump to increase as the shaft rotates. Since the gear pump is internally sealed by the gear end face and the end face of the bushing, when the axial sealing end face is seriously worn, the internal axial seal of the pump will generate a certain gap, resulting in communication between the high and low pressure oil chambers and the oil seal flushing. .
3 Gear pumps are subjected to excessive radial forces. If the coaxiality of the gear pump is not good, the radial force of the pump will exceed the bearing limit of the oil seal, which will cause the oil seal to leak oil. At the same time, it will also cause damage to the floating bearing inside the pump.
4, not enough pressure or pressure
1 This phenomenon is mostly related to the cleanliness of hydraulic oil. If the oil is not selected correctly or the cleanliness of the oil in use does not meet the standard requirements, it will accelerate the internal wear of the pump and cause leakage.
2 Use mineral hydraulic oil with additives to prevent oil oxidation and bubble generation.
3 By observing the bushings and side plates of the faulty gear pump, it is found that if the cleanliness of all the oils will cause obvious groove marks on the surface of the friction pair, only the uniform surface marks will be generated on the sealing surface of the normally worn gear pump.
5, the flow does not meet the standard
1 The oil inlet filter is too dirty and the oil absorption is insufficient.
2 The installation height of the pump is higher than the self-priming height of the pump.
3 The oil suction pipe of the gear pump is too fine, resulting in large oil absorption resistance. Generally, the maximum oil absorption flow rate is 0.5 to 1.5 m/s.
4 The oil leakage of the suction port joint causes the oil pump to absorb insufficient oil. You can judge whether the system is leaking by observing whether there is air bubble in the fuel tank.
6, gear pump burst
The pressure resistance of the gear pump of aluminum alloy material is 38-45 MPa. Under the premise of no manufacturing defects, the gear pump explosion is definitely caused by the instantaneous high pressure.
2 The oil pipeline is blocked by foreign matter, causing the pressure to rise indefinitely.
3 The pressure of the safety valve is adjusted too high, or the opening and closing characteristics of the safety valve are poor, and the reaction is delayed, so that the gear pump is not protected.
4 If the system uses multiple directional control valves to control the direction, some multi-way valves may be negative openings, which will cause the gear pump to be damaged due to the dead point boost.
-----Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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