A composite structure of screw seal and magnetic fluid seal and high-speed rotor with the same

By combining the spiral seal and magnetohydrodynamic seal composite structure, the pumping backflow of the spiral seal and the static zero leakage characteristics of the magnetohydrodynamic seal are combined to solve the problem of insufficient sealing performance of high-speed gearboxes under complex working conditions. This achieves zero or extremely low leakage across the entire speed range, improves the pressure and speed resistance of the seal, and extends its service life.

CN122708166APending Publication Date: 2026-09-08NO 703 RES INST OF CHINA SHIPBUILDING IND CORP
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Patent Information

Application Number
CN202611106926.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-24
Publication Date
2026-09-08

AI Technical Summary

Technical Problem

The existing sealing structure of high-speed gearboxes has insufficient sealing performance under complex working conditions, resulting in high leakage rate and poor reliability. In particular, it is difficult to achieve long-term stable operation during start-up, shutdown and high speed.

Method used

By employing a composite structure of spiral seal and magnetohydrodynamic seal, the pumping backflow characteristics of the spiral seal and the static zero leakage characteristics of the magnetohydrodynamic seal are utilized. By combining spiral seal elements and magnetohydrodynamic seal units, zero leakage or extremely low leakage sealing is achieved across the entire speed range.

Benefits of technology

It achieves zero or extremely low leakage across the entire speed range, improves the pressure and speed resistance of the seal, extends service life, is highly adaptable, has a compact structure and is easy to modify, and is suitable for harsh environments such as high-speed gearboxes.

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Abstract

The present application belongs to the technical field of mechanical transmission sealing, and particularly relates to a spiral sealing and magnetic fluid sealing composite structure and a high-speed rotor with the same. The present application utilizes the high-speed pumping backflow characteristic of the spiral sealing and the static zero leakage characteristic of the magnetic fluid sealing to complement each other, and realizes full working condition sealing from zero rotation speed to the highest rotation speed. When the gear box rotor is static or operates at low speed, the magnetic fluid sealing unit relies on the magnetic field to constrain the magnetic fluid to occupy the sealing gap, and realizes static sealing; when the gear box rotor reaches a certain rotation speed, the lubricating oil is pumped back to the inside of the box body in reverse through the back oil channel through the pumping action of the spiral groove of the spiral sealing, and dynamic sealing is realized; the spiral sealing bears most of the sealing pressure difference, so that the magnetic fluid sealing unit only bears very low pressure difference, thereby allowing the magnetic fluid sealing to still maintain a sealing form under high-speed rotation.
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