US 12,018,529 B2
Spiral magnetic fluid composite sealing structure of roller bit
Yi Zhou, Chengdu (CN); Fuxiao Zhang, Chengdu (CN); Xinlin Lei, Chengdu (CN); Ruchen Wang, Chengdu (CN); and Wenchao Song, Chengdu (CN)
Assigned to SOUTHWEST PETROLEUM UNIVERSITY, Chengdu (CN)
Filed by SOUTHWEST PETROLEUM UNIVERSITY, Chengdu (CN)
Filed on Mar. 17, 2023, as Appl. No. 18/122,737.
Claims priority of application No. 202210545596.8 (CN), filed on May 19, 2022.
Prior Publication US 2023/0374864 A1, Nov. 23, 2023
Int. Cl. E21B 10/25 (2006.01); F16J 15/43 (2006.01)
CPC E21B 10/25 (2013.01) [F16J 15/43 (2013.01)] 2 Claims
OG exemplary drawing
 
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.