CPC E21B 10/25 (2013.01) [F16J 15/43 (2013.01)] | 2 Claims |
1. A spiral magnetic fluid composite sealing structure of a roller bit, comprising:
a cone leg; and
a roller;
wherein the roller and the cone leg are in rotatable connection in a fitting manner through a roller inner hole and a cone leg shaft journal, a sealing groove is formed in an opening end of the roller inner hole; and a spiral magnetic fluid assembly is arranged in the sealing groove;
wherein the spiral magnetic fluid assembly comprises a magnetic fluid, magnetic poles, permanent magnets, and pole teeth, wherein a spiral groove is formed in a side wall of the sealing groove; the magnetic poles and the permanent magnets are arranged in the spiral groove; the pole teeth are arranged at an end part of one end of the magnetic pole close to the cone leg shaft journal; and the magnetic fluid is arranged in an inner gap of the sealing groove.
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