For reliable sealing and compaction in the mechanisms of mobile and motionless compounds (cranes, shafts, rods, reinforcement, etc. D.) In oilcomer chambers, the stuffing of the oil seal is used.
As a rule, the material for stuffing is an asbestos, cotton or bast wicker cord, soaked in fat and graphite. The choice depends on the operating conditions of the entire mechanism as a whole.
Material. The selection of the material of the oil seal depends on the operating conditions. To work at high temperatures and pressure, asbestos cords are used. At lower temperatures, cotton and bast. The latter are also often used in the aquatic environment. The stuffing of the oil seals is also carried out on the basis of Teflon, reinforced or fully consists of metal.
Impregnation. The impregnation of the stuffing of the oil seal is selected according to the following principle: graphite is ideal for high temperatures, in the steam and oil medium, but fat is more suitable for the aquatic environment, as it gives the material hydrophobic properties and improves the seal, therefore, restrains water. Fatty impregnation has a temperature limit of about 200 degrees.
Form and section size. The stuffing is usually produced in square and round section. In practice, the size of the cross -section is also very important, when pressing the stuffing to the wall of the oilcetics chamber, a leak is guaranteed with a loose press. The problem is that this can not be immediately noticed, and then sin on not a dense puff.
The general principle of choice. When choosing a stuffing to the omentum, pay attention to the following operating conditions: a working pressure interval, a working temperature interval and pH of the medium. The choice of impregnation of the seal not only in water, but also in gas environments depends on the latter in particular.