Technical advantages of liquid film sealing-

Technical advantages of liquid film sealing

　2018-08-07　　

Technical advantages of liquid film sealing:

Theory, experimental research and industrial applications show that compared with ordinary contact mechanical seals, non-contact liquid film seals have the following series of technical advantages:

①Same as gas film seal, zero leakage or zero escape of the sealed medium can be achieved, and environmental pollution can be eliminated.

②Since the seal friction pair is in a non-contact state, there is no direct solid friction and wear between the end faces, and the service life is greatly extended.

③The frictional energy consumption of the end face is reduced by about 5/6, and the amount of seal washing fluid and cooling water used to reduce the temperature rise of the end face is greatly reduced, which improves the operating efficiency.

④ No complicated oil supply, circulation system and matching control system are required, and the zero escape upstream pumping seal with buffer fluid is required. The pressure of the buffer fluid is much lower than the pressure of the sealed medium, and there is no need Circulation, consumption is also small. Therefore, it is relatively simple and does not require high reliability of the auxiliary system.

⑤ It can be used under the conditions of higher pv value and high solid particle medium.

Specific example: A feed pump (with a shaft diameter of 800mm) in an alumina plant of China Aluminum Corporation as an example: The contact mechanical seal was originally used, and then it was changed to a double-end liquid film seal. The comparison of the use effect is shown in Table 3-8. Said.

Table 3-8 Comparison of use effect

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Select the conditions of gas film mechanical seal 　　 end face structure, product development and application of liquid film mechanical seal