How many sealing forms are there for Roots blower in steel plant? How to select Roots blower?

There are four sealing forms for Roots blower in the steel plant. What are the sealing forms? The common sealing forms of Roots blower in iron and steel plant include packing gland type, expansion ring type, labyrinth type and mechanical seal. The type of sealing shall be determined mainly according to whether the gas is toxic, whether it can contact with lubricating oil, whether it is flammable and explosive, whether it is clean and whether it is valuable.

① Gland type:

When pressing air and other gases, a pair of gland seals are often arranged between each bearing and cylinder - a total of four sets of such seals, and a set of oil seals are arranged at the extension end of the shaft.

② Skeleton type:

The skeleton seal is generally skeleton

When pressing oxygen, nitrogen, sulfur dioxide and other gases that cannot be contacted with the lubricating oil, four groups of mechanical seals are set at the through part of the cylinder to completely isolate the lubricating part of the bearing and gear from the gas. This configuration mode makes the bearing span of roots blower of rotor increase.

③ Mechanical seal:

When pressing coal gas and methane gas, it is often made into a closed bearing box, and the shaft through part is sealed with a group of glands. For example, when pressing hydrogen gas, mechanical seals can be used.

When pressing acetylene gas, liquefied petroleum gas and other gases, four sets of mechanical seals are used, and the lubricating oil of bearing and gear parts is used to cool the friction surface.