The importance of mechanical seals in the use of all dynamic seals-

The importance of mechanical seals in the use of all dynamic seals

　2017-01-10　　

In dynamic seals, mechanical seals account for more than 80% of the total, so the study of its basic theory is extremely important. Mechanical face seal (Mechanical Face Seal) is a kind of axial face seal, referred to as mechanical seal, also known as end face seal, which is a commonly used rotary shaft seal, especially in the pump equipment of petrochemical plants.

The first mechanical seal patent appeared in Britain in 1885, and it was not used for bearing seals until 1900. In 1908, several steam turbine seals were improved to seal ring seals with movable shafts. In 1913, a British patent for the use of double-end mechanical seals on steam turbines appeared. In 1919, a single-end mechanical seal appeared. Before 1920, Xiaoyi used mechanical seals for the shaft seals of household refrigeration compressors and automobile water pumps. Used in internal combustion engine water pump shaft seal in 1930. In 1940, the use of wide mechanical seals solved the sealing problem of light hydrocarbon pumps to a certain extent. Beginning in 1940, it was mainly to improve the sealing surface materials, and ceramic, graphite, and cemented carbide seals appeared. At the same time, the processing technology reduced the surface roughness value, thereby improving the use parameters of the mechanical seal. In 1945, balanced seals, intermediate ring seals and other patented mechanical seals appeared in the structure, and were used in petrochemical machine pumps to increase the PV value to 80”?^01/8. In 1957, the world’s first production A set of metal welded bellows mechanical seal.

From 1962 to 1963, high-parameter thermohydrodynamic wedge seals and various non-contact hydrostatic and hydrodynamic seals appeared. At this time, mechanical seals have been popularized and promoted in the United States and applied to the petroleum and chemical industries. The former Soviet Union and European countries began to be widely used in succession. In the 1950s, mechanical seals were used for centrifugal oil pump shaft seals in refineries. When the Lanzhou Oil Refinery in my country used mechanical seals for centrifugal oil pumps, the mechanical seals were self-made and popularized in the early 1960s. Other refineries have gradually promoted and improved widely. More than 85^ of the pumps of the X-art device in the former refinery use mechanical seals. Chemical and other industries also promote the use of mechanical seals. Now my country has mechanical seal standards, series of products, professional manufacturers and research units.　　232.html,

Precautions when mechanical seals are used in slurry pumps 　　 The wide range of pressure and temperature that mechanical seals are subjected to