Rotary sealing device of graphite ring structure

Abstract

The invention provides a rotary sealing device of a graphite ring structure. The rotary sealing device comprises cylindrical pins, springs, a backing ring, a graphite ring and an upper backing ring. The graphite ring and the backing ring are closely attached so that airtightness and no leakage can be ensured. On the other hand, the low friction coefficient of graphite ensures the low friction property of the whole rotary seal, and the problems that the rotary motion seal is easy to leak and the friction force is too large and is difficult to balance are solved. According to a sealing method of the device, an annular groove is formed in a fixing piece, and the backing ring is located in the annular groove; a plurality of uniformly distributed cylindrical blind holes are formed in the annular groove, and two symmetrical cylindrical holes and the backing ring are connected and limited by the cylindrical pins; the springs are placed in the other cylindrical holes and support the graphite ring bonded with the backing ring, so that the graphite ring is tightly attached to the upper backing ring; and the upper backing ring is fixedly connected with a rotary moving piece through a threaded blind hole in the back side and rotates together with the moving piece.

Description

technical field [0001] The invention relates to the technical field of rotary sealing, in particular to a rotary sealing device with a graphite ring structure. Background technique [0002] At present, packing seals, oil seals and mechanical seals are commonly used in the rotary motion sealing motion. Although the packing type combined dynamic seal has a simple structure and is easy to install and maintain, its essentially porous structure is closer to the essence of leakage; the oil seal has the problems of poor pressure bearing capacity, low service life and easy leakage; the lip seal ring It is difficult to ensure that the pressing force is appropriate for rotary motion sealing. If the pressing force is too small, the sealing effect will not be achieved, and if the pressing force is too large, dry friction will occur. At the same time, the lip seal further reduces the friction coefficient by adding graphite particles to the material with a lower friction coefficient, so ...

AI Technical Summary

Problems solved by technology

Although the packing type combined dynamic seal has a simple structure and is easy to install and maintain, its essentially porous structure is closer to the essence of leakage; the oil seal has the problems of poor pressure bearing capacity, low service life and easy leakage; the lip seal ring It is difficult to ensure that the pressing force is appropriate for rotary motion sealing. If the pressing force is too small, the sealing effect will not be achieved, and if the pressing force is too large, dry friction will occur.

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