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Time：2025-04-29 10:07:13 Reading volume：
The hydraulic pump is an important part of the hydraulic system of the oil purifier, and its damage will seriously affect the efficiency of the equipment. Most of the causes of damage are due to improper operation and other phenomena. Therefore, in order to better solve this problem, it is necessary to grasp its causes and make reasonable judgments.
To be precise, when the use environment of the pump is getting worse and worse, various factors have been hidden in the system to damage the pump. 90%-95% of pump damage can be summarized as follows:
Air mixing refers to the phenomenon in which air bubbles are dispersed in the working fluid of the oil purifier system. The hydraulic oil system can find bubbles in the oil tank, and severe cases, it can emulsify the oil. When the bubbles are compressed to the outlet of the pump, a rupture effect will occur, resulting in the peeling of the metal surface, such as the pressure side plate, the wear-resistant side plate, etc.
Close to the rupture point, resulting in high temperatures in this place. The air mixing phenomenon will produce noise, which increases with the increase in pressure. Air mixing will also cause abnormal movements of various components (pressure swing, etc.) and actuator creep.
The possible ways to cause air to mix into the pump are mainly to bring air into the bad oil seal (shaft seal) and the pump inlet pipe, system return oil pipe, cylinder shaft seal and other parts that are not tightly sealed. Therefore, when installing the pump inlet joint, system return oil and drain pipe joint, be very careful to apply sealant and put the sealing gasket and rubber ring in place.
Air corrosion refers to the local gasification phenomenon that occurs in the fluid when the pressure is reduced to the saturated vapor pressure. Simply put, this air corrosion phenomenon occurs when the working fluid does not fill the space it should occupy. The noise caused by air corrosion is roughly similar to the noise caused by air mixing. The main causes of air corrosion are that the pump runs too fast, the pump inhales the liquid too fast, the suction pipe is too long, or the working fluid is too viscous, so when installing the pump suction pipe, a flexible hose is not required.
Working fluid contamination refers to solid mechanical impurities, water, gas, debris, etc., present in the working fluid. Mechanical impurity particles mixed in the working fluid will greatly increase the friction and wear of the parts. In severe cases, it will get stuck, overheat and burn, twist off the drive shaft, etc., and it will also block the throttling gap, causing parts to malfunction or fail, so the working fluid is required to have a certain degree of cleanliness.
Control the pollution of the hydraulic system to meet the specified cleanliness requirements. When replacing the pump, check the filter. If the filter is found to have contaminants, the source of contamination should be found and the source of contamination should be eliminated. ｒｅｐｌａｃｅ the filter or ｒｅｐｌａｃｅ the hydraulic oil or filter bypass, that is, use the filter to filter the liquid in the tank regularly or irregularly, filter the impurities in the working fluid, analyze the contaminants, find out the cause, and eliminate the source of contamination.
Install the sperm on the return pipe at the pump outlet or return to the tank. The control system is installed with 3-5μm (glass fiber or chemical glass composite filter element), 10μm (glass fiber or chemical glass composite filter element) for high-pressure systems, and 20μm filtration accuracy (glass fiber or glass composite and filter element) for general hydraulic systems. If the oil purifier is omitted, although it can work for a short time, there is always a hidden danger of failure, and failure may occur at any time.
Since overheating exceeds the specified upper limit temperature, the pump is generally specified to be below 60 °C. ℃ to work in the liquid. For hydraulic oil, overheating will accelerate the oxidation of hydraulic oil, reduce its viscosity of the oil, and produce a chain reaction. Therefore, the real cause of pump overheating should be eliminated.
Overpressure means that the working pressure of the pump is greater than the pressure designed for the pump. Overpressure will cause the internal components of the pump to bear a greater load and cause some components to fail prematurely.
For the working fluid, it is very important to choose the right viscosity. In the hydraulic system, the viscosity of the hydraulic oil is too high, which may cause increased friction in the pump, resulting in increased system temperature, large pressure loss, and high energy consumption. If the viscosity of the hydraulic oil is too low, internal leakage will increase and the oil temperature will also increase. In addition, the hydraulic oil should have good viscosity-temperature performance.
When replacing new oil, pay attention to secondary contamination. The old oil in the oil tank should be cleaned and the inner surface of the oil tank should be cleaned. At the same time, ｒｅｐｌａｃｅ the filter element and clean the filter screen to avoid secondary contamination and shorten the service life of the pump.
