Rotary detachable guide pipe-upper pipe seat connecting piece

The invention discloses a rotary detachable guide pipe-upper pipe seat connecting piece which comprises a turnbuckle cap (13) and a turnbuckle sleeve (14), wherein the turnbuckle cap (13) and the turnbuckle sleeve (14) are each of a round pipe structure, are in close fit and are connected through a turnbuckle structure; the upper part of the turnbuckle cap (13) is provided with an elastic skirt (1); the middle lower part of the elastic skirt (1) is provided with a semicircular bulge (12); a plurality of longitudinal grooves (11) are uniformly formed on the elastic skirt (1) along the circumferential direction; the elastic skirt (1) is divided into a plurality of sections through the longitudinal grooves (11). Through the specific turnbuckle structure and a loose design, reliable connection between an upper pipe seat and a guide pipe of a fuel assembly is achieved, and the connecting piece is conveniently and remotely operated and detached when required. The connecting piece is connected by means of a mechanical mode and is elastically locked, plastic deformation is not produced basically, and the connecting piece and the upper pipe seat are prevented from being damaged during mounting and detaching.