A maintenance-free rotating compensator comprises an outer
pipe (1) and an inner
pipe (2) and is characterized in that a
flange (5) is arranged in the middle of the inner
pipe, a locating ring (4) and a sealing sleeve (3) are sequentially arranged on the right side of the
flange in a sleeving mode, and the pipe portion of the sealing sleeve is in sealing contact with the outer circle of the inner pipe; the pipe portion of the sealing sleeve extends into the outer pipe, a gap is reserved between the pipe portion of the sealing sleeve and the inner wall of the outer pipe, a
flange (7) is arranged at the left end of the outer pipe, and the left end of the sealing sleeve is located on the left side of the flange along a convex edge which extends in the radial direction; multiple bolts (8) penetrate through the locating ring, the convex edge of the sealing sleeve and the flange, a nut located at the left end of the bolt is screwed up so that the convex edge of the sealing sleeve presses the flange, and the sealing sleeve is made of a
silicon rubber material. Due to the fact that the sealing sleeve is made of the
silicon rubber material, after the inner wall of the sealing sleeve is abraded, the elasticity of
silicon rubber still enables the pipe portion of the sealing sleeve to make contact with the inner pipe in a sealing mode, the sealing performance is maintained, maintenance
workload is greatly reduced, and compared with an existing rotating compensator, the service life of the maintenance-free rotating compensator is prolonged.