Semi-contact graphite sealing device

Abstract

The invention relates to a semi-contact graphite sealing device. The semi-contact graphite sealing device comprises a friction moving ring and a graphite fixed ring, the inner ring surface of the friction moving ring is in clearance fit with a rotary shaft, and the friction end surface of the friction moving ring makes contact with the end surface of the graphite fixed ring; a plurality of spiralshallow slots which are of the same structure are uniformly distributed in the friction end surface, all the spiral shallow slots extend outwards along the friction end surface from the junction between the friction end surface and the inner ring surface so that the spiral shallow slots can form openings on the inner ring surface, the friction end surface is provided with an annular pressure stabilizing ring slot, and the tail ends of the spiral shallow slots communicate with the pressure stabilizing ring slot so that the tail ends of the spiral shallow slots can communicate with one another;and the pressure stabilizing ring slot and the friction moving ring are coaxially arranged, the inner diameter of the pressure stabilizing ring slot is larger than that of the graphite fixed ring, theouter diameter of the pressure stabilizing ring slot is smaller than that of the graphite fixed ring so that the end surface of the graphite fixed ring can completely cover the pressure stabilizing ring slot when the friction moving ring and the graphite fixed ring are assembled, and meanwhile, the tails of the spiral shallow slots are covered by the end surface of the graphite fixed ring.

Description

technical field [0001] The invention relates to the technical field of mechanical seals, in particular to a semi-contact graphite sealing device. Background technique [0002] For the high-speed mechanical transmissions that need to be sealed in aero-engines and turbine starters, contact-type flat-seal graphite sealing devices are generally used. This sealing device requires high machining accuracy of the sealing surface, low yield and high cost. When working, the contact friction of the sealing surface is large, the power consumption is high, heat is easy to generate, and the sealing life is short. The problem of oil leakage cannot be avoided by using the contact flat seal. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a semi-contact graphite sealing device with simple structure and improved sealing effect. The present invention realizes combined sealing by means of static state friction moving ring friction ...

AI Technical Summary

Problems solved by technology

[0002] For the high-speed mechanical transmissions that need to be sealed in aero-engines and turbine starters, contact-type flat-sealed graphite sealing devices are generally used. This sealing device requires high machining accuracy of the sealing surface, low yield and high cost.

When working, the contact friction of the sealing surface is large, the power consumption is high, it is easy to generate heat, and the sealing life is short. The problem of oil leakage cannot be avoided by using a contact flat seal.

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