One reason, lubricating oil quality deterioration
Machinery and equipment when it is working, the oil because of the long-term contact with metal, influenced by the surrounding air, temperature, pressure, electric field, light and other factors, in the oil gradually increasing external impurities, which results in the oil will be moisture, dust, sand, metal debris, and gradually oxidized in the long-term use, the chemical composition changes, deterioration of substances and harmful impurities, generally have the following categories:
1, by foreign impurity fouling
The oil in the system in use process, most likely to be mechanical impurities of various dirty. These impurities are metal debris, dust, sand, such as fiber material. This is due to the friction parts of metal powder on the ground down into the oil, or due to system and machine shell not tightly closed, so that the dust, sand oil immersed in. For example, when the tractor working in the fields, the cars on the road, there will be a lot of dust, fine sand with the air through air filter into the lubricating oil of the engine. Mining machinery is often ore powder. Hydraulic oil lubricating oil processing machine tools and hydraulic equipment use, often be the chip processing parts of the terminal and other metal powder fouling. Have a bad effect on the quality of these impurities in oil system, it will be like abrasive like mechanical heating, so that the parts wear out prematurely.
2, by the water turbidity
Oil in the mechanical equipment, often water infiltration, this is because the lubricating system, all kinds of machinery and equipment of hydraulic transmission system, or water cooling device is not strict, so that the water flows into the oil. In addition, the air contains water can also be oil absorption, because the oil absorbent, its water absorption is determined by the size of an ambient temperature. For example transformer dissolved water and transformer oil temperature have great relations.
3, thermal decomposition
There are many kinds of oil, high temperature parts when it and the machinery and equipment of the contact, for example, in the combustion area of the engine fuel, direct contact when in quenching and red hot metal, and the switch and high voltage arc in oil direct contact, will suffer from local overheating greatly, until the occurrence of partial combustion phenomenon, and can make the oil heating to a high temperature. When the oil makes the thermal decomposition (cracking), the results will generate glial and hard coke coke, which is called. Coke has a great harm to the engine of the car, because carbon is a poor conductor of heat, the wall of the combustion chamber and the piston top cover of carbon deposition, caused by bad heat, resulting in overheating and damage accident parts.