Non-contact type mechanical sealing device

Abstract

The invention discloses a non-contact type mechanical sealing device. A rotating sealing ring and a static sealing ring are coaxially arranged, and sealing is achieved through the axial end surface of the rotating sealing ring and the axial end surface of the static sealing ring. A sealing ring structural body of a first sealing unit comprises a sealing ring and a ferromagnetic material structure or a permanent magnet material structure, wherein the sealing ring can make axial displacement, and both two axial end surfaces of the sealing ring are sealing surfaces. A second sealing unit comprises two sealing structural bodies which are axially arranged at two axial ends of the sealing ring structural body of the first sealing unit, a sealing ring and a corresponding electromagnet structure are arranged on each sealing ring structural body of the second sealing unit in a sealing clearance mode, and each sealing ring and each electromagnet structure are opposite to the axis of the sealing ring of the first sealing unit. When one sealing ring of the two sealing units is the rotating sealing ring, the sealing ring of the other sealing unit is the static sealing ring. A sensing structure which detects the distance between the sealing clearances is arranged on at least one side of the two sealing structural bodies which are opposite to the sealing clearances, and an electromagnetic coil and the sensing structure of each electromagnet structure are respectively connected with an energizing control structure. The non-contact type mechanical sealing device can achieve active control of the sealing clearances in a magnetic levitation mode, enables the sealing to have a good dynamic property, and is reliable and stable in operation, easy to maintain, long in service life and wide in application range.

Description

technical field [0001] The invention relates to a non-contact mechanical seal device, more particularly to a non-contact mechanical seal device working in a magnetic levitation mode. Background technique [0002] The fluid film non-contact mechanical seal is a commonly used shaft end seal method at present, and the seal is realized by a rotating seal ring and a stationary seal ring coaxially arranged with the opposite end faces as the sealing faces. The rotating sealing ring can rotate with the rotating shaft, and the stationary sealing ring is positioned and connected with the corresponding fixed structure on the machine base. When the unit is running, under the fluid friction state, a complete fluid film is filled between the sealing end faces to make the rotating ring and the stationary ring separate from each other and achieve a dynamic seal. One of the main directions of non-contact mechanical seal research today is to improve the stability and reliability of seal oper...

AI Technical Summary

Problems solved by technology

There are two problems in the traditional fluid film non-contact mechanical seal: one is that it is impossible to actively adjust the seal end face clearance

However, the traditional non-contact mec

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