Lubricating principle of lubricating oil Lubricating oi […]
Lubricating principle of lubricating oil
Lubricating oils generally consist of two parts, a base oil and an additive. The base oil is the main component of the lubricating oil, which determines the basic properties of the lubricating oil. The additive can make up for and improve the performance of the base oil. The performance of some lines is an important part of the lubricating oil. Under certain conditions, the process of mixing two or more base oils of similar nature and composition in a certain ratio and adding additives becomes blending. In general, lubricating oil blending requires 1 to 3 base oils and 1 to 5 additives. Most of the lubricating oil blending is a homogeneous mixing of liquid-liquid phase mutual dissolution, and in some cases, an insoluble liquid-liquid phase system, and a liquid-liquid dispersion formed after mixing. When the lubricating oil additive is a solid, the liquid-solid phase is heterogeneously mixed or dissolved, and the solid additives are not many, and eventually mutually miscible to form a homogeneous phase. It is generally considered that liquid-liquid homogeneous mixing is a combination of three diffusion mechanisms, such as molecular diffusion and convection diffusion.
(1) Molecular diffusion
The transfer of matter is caused by the relative motion of the molecules. This diffusion takes place in the space of the molecular scale.
(2) Eddy current diffusion
When mechanically transferred to a liquid material, the fluid at the interface between the high velocity fluid and the low velocity fluid is subjected to intense shearing, forming a large number of vortices, and mass transfer caused by the vortex splitting motion. This mixing process is carried out in a vortex-scale space.
(3) Main body convection diffusion
This includes all mass transfer caused by the circulation of all liquids that do not belong to molecular motion or vortex motion, such as the long mass transfer process caused by convective circulation in a stirred tank. This mixing process is carried out in a large scale space.
Lubricating oil blending process type
The lubricating oil blending process mainly has two basic forms: tank blending and pipeline blending. If further distinction is made, it can be generalized into several main production methods such as tank blending, pipeline blending, tank-pipe blending, and gas pulse blending.
The tank blending system sends the base oil and additives directly to the blending tank in proportion, and after being stirred, it is the refined oil. According to the formulation requirements, the pipeline blending system controls the flow rate of the raw materials in the pipeline according to the proportion of each component. After the mixer, it is the refined oil, which can be directly transported to the buffer tank for filling. The characteristics of the observation system are that the components are sent to the blending tank at a high speed, but the stirring time is long. The lubricating oil pipeline blending system includes the base oil pipeline and the additive pipeline, and the same frequency converter adjusts the rotational speed of the pipeline pump. In order to dynamically adjust the flow rate of the raw material oil in each pipe to a preset ratio, the optimal blending precision is ensured.