Patent ID: 6422611
Filing Date: 2002-07-23
Classification: F16L

Abstract:
An expansion joint device used for metal conduits, comprising an inlet short tube, an outlet short tube and a sleeve, both the opposed inside ends of said two short tubes are in the inside of the sleeve and form a compensating gap between them, a bellows member having ripply nodes and being axially expansible with an external force applying on, is provided in the compensating gap formed between the opposed inside ends of the two short tubes and the two ends of the bellows member are respectively connected with the inside ends of the two short tubes in a sealed manner, at least one of the two ends of said sleeve is a free end with respect to the two short tubes, wherein the crests of the ripply nodes of an outside-oriented ripple in said bellows member contact or tend to contact an inner wall surface of said sleeve, a trough in a ripply node of an inside-oriented ripple in said bellows member is provided with a trough-mated core, and a gap is formed between surfaces of said trough and said trough-mated core, said gap enables said ripply node to be deformed without exceeding its elasticity limit, an outer wall surface of said trough-mated core contacts or tends to contact the inner wall surface of said sleeve, said trough-mated core has a combination structure composed of multiple-segments.