1. Labyrinth seal
Labyrinth seals are also called pull order seals, comb seals, in the application of fan products, the interstage seals on fan products are basically maze seals, the fan shaft end seals that convey air are also used in the case of low pressure.
2. Floating ring seal
High pressure blower
The floating ring seal is the use of high-pressure fan spindle and floating ring between the formation of a pressure oil film, the oil film of the closing pressure and the external load (working medium pressure) to achieve a balance, to seal the axial leakage of the working medium. Because the floating ring seal has the advantage of automatic alignment center, the sealing gap can be smaller, the leakage amount is reduced, the pressure of the sealing body can be adjusted with the pressure of the sealed medium, and the liquid friction state is maintained between the floating ring and the shaft, thus avoiding mechanical wear. This seal is used when the pressure is high or when there is a corrosive gas to ensure that the conveyed gas does not leak outward.
3. Mechanical seal
Mechanical end seal is a kind of sealing device that relies on the preload of the static and dynamic ring end face pairs of the elastic element and the compression of the medium pressure and the elastic element pressure to achieve the axial rotation of the seal. Mechanical seals generally use a pressure higher than the sealed medium 2.5 ~ 3.5 seal liquid (turbine oil) to seal the sealed medium. During the rotation, the friction surface establishes an oil film, and the pressure of the oil film is from the outside to the inside, from large to small, and the zui is balanced with the sealed medium. Since the sealing liquid pressure is always greater than the sealed medium, the sealed medium generally does not leak, and the sealing liquid has a small amount of leakage inward, and the leaking sealing liquid will be recycled through the oil return hole. Due to structural changes, the amount of oil used in mechanical seals is greatly reduced compared with that of floating ring seals, but they all belong to oil film seals.
4. Dry gas seal
Dry gas seal is a gas film seal, which is a form of sealing of the current turbo compressor zui* inlet and sealing effect. It is the use of nitrogen or other harmless gas as a sealing medium. The cleanliness of the sealing gas is high, and there is a more complex gas supply system.