FIELD: engines and pumps.
SUBSTANCE: proposed seal comprises two resilient graphite rings with crosswise cutout fitted between two slip rings. The seal additionally comprises a continuous graphite ring fitted inside the resilient graphite rings with crosswise cutuot with a gap and making contact with the slip rings at the but ends, two ring elements with adjusting ring between them fitted and fixed in the axial direction at the turbomachine rotor trunnion. There is a gap between the inner surfaces of resilient graphite rings with a crosswise cutout, continuous graphite ring and the outer surfaces of the ring elements with adjusting ring, two conical annular membrane are fitted in the gap between the ring element and the corresponding slip ring and connected to them by means of permanent connections. Cone bases of mentioned conical annular membranes are positioned on the low-pressure cavity side. Resilient graphite rings with crosswise cutout are fitted with an angular displacement relative to each other with the possibility of overlap of their crosswise gaps and fixed against rotation relative to each other, there is an annular groove at the joint of the resilient graphite rings with crosswise cutout on the side of their inner surface, and there is an O-ring fitted in the annular groove.
EFFECT: reduction of friction and wearing of sealing elements at lower turbomachine operation modes while maintaining absolute tightness of the seal in all turbomachine operation modes and improvement of its reliability.
1 dwg
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Authors
Dates
2017-03-30—Published
2015-11-05—Filed