How to choose hydraulic oil?
The hydraulic oil is the use of liquid pressure can be used the hydraulic system of hydraulic medium, in the hydraulic system plays an energy transfer, anti-wear, lubrication system, anticorrosive, antirust, cooling, etc. For the hydraulic oil, first of all should satisfy hydraulic equipment in working temperature and the temperature of the liquid viscosity requirements, as a result of the lubricating oil viscosity changes directly related to the hydraulic action, transmission efficiency and transmission accuracy, also requires oil viscosity-temperature properties and shear stability should meet the diverse needs of different USES the proposed. A wide range of hydraulic oil, different classification method, for a long time, accustomed to use classification, there are also depending on the type of oil, chemical composition, or flammability classification. These classifications only reflect the earnings of oil products, but they are not systematic, and it is difficult to understand the relationship and development of oil products.
The lubrication of hydraulic oil is in the order of reducing the grinding effect of the three pumps, which is the > plunger pump. Therefore, the hydraulic system of the main oil pump of the blade pump is good, no matter its pressure size. The higher the precision of the hydraulic system, the higher requirements for the cleanness of the hydraulic oil which is chosen, such as for closed-loop hydraulic system with electrohydraulic servo valve requirements in nc machine tool hydraulic oil, this two kinds of oil can be respectively replaced with senior HM and HV hydraulic oil. Experiment showed that the order of the three kinds of pump of hydraulic oil cleanliness requirements is higher than that of the gear pump and the vane pump plunger pump, in order to the requirement of extreme pressure performance is higher than that of plunger pump and the gear pump vane pump.
According to the form of the friction and its material. Vane pump with the stator blade surface contact with the oil in sports wear extremely easily, the friction pair of steel and steel materials, applies to ZDDP (dialkyl disulfide zinc phosphate) as the anti-wear agent of L - HM anti-wear hydraulic oil; Plunger pump cylinder, oil distribution plate, piston friction form and movement is in a form suitable for the use of HM anti-wear hydraulic oil, but there are bronze parts in the plunger pump, because the material components and ZDDP corrosive wear, bronze pieces is a plunger pump can't use for ZDDP additive HM anti-wear hydraulic oil. At the same time, the hydraulic oil should be chosen to be used for the sealing material in the hydraulic system. The average blade pump can choose the type zinc resistant hydraulic oil, and the plunger pump is best to choose the non-gray oil. The vane pump pressure is higher than the 15MPa, the plunger pump pressure is higher than 30MPa, the hydraulic system of the two model pump simultaneously, should choose the product that conforms to Denison HF - 0 specification.
Choice according to the working environment and working conditions of hydraulic oil in hydraulic equipment used in the hydraulic oil, should from the working pressure, temperature, working environment, the structure of the hydraulic system and components and materials, economy and so on several aspects such as comprehensive consideration and judgment. Environmental factors include: ground, underground, indoor, wild, coastal, cold zone, high temperature and open fire. Usage: type of pump, pressure, temperature, material, sealing material and running time. Properties of oil: physical and chemical properties. Economy: use time, oil change, price.
