Pipe joint

摘要

A pipe joint includes a soft pipe, a hard pipe and a sleeve. The hard pipe includes an insert portion inserted into an inside of the soft pipe from an end portion of the soft pipe. The sleeve is arranged radially outside of the insert portion and the soft pipe, and presses the soft pipe toward the insert portion. The insert portion includes a corrugated surface, which is arranged on an outer surface of the insert portion, and a column surface, which is arranged on the outer surface at a tip side of the insert portion. The sleeve includes a first small diameter portion, which is arranged radially outside of the corrugated surface and presses the soft pipe toward the corrugated surface, and a second small diameter portion arranged radially outside of the column surface and presses the soft pipe toward the column surface.

主权项

1. A pipe joint comprising:
a single piece soft pipe made of a resilient material, the soft pipe further defining a multi-layer tube including an elastic material and a fiber layer; a hard pipe having an annular groove formed therein and including an insert portion which is inserted into an inside of the soft pipe from an end portion of the soft pipe; and a sleeve arranged radially outside of the insert portion and the soft pipe, the sleeve being in direct contact with the soft pipe and pressing the soft pipe toward the insert portion, the sleeve including an annular plate portion, the annular plate portion engaging the annular groove formed in the hard pipe, wherein the insert portion includes
a corrugated surface which is provided on an outer surface of the insert portion to have a plurality of annular grooves and a plurality of ribs, anda column surface which is arranged on the outer surface of the insert portion and located on a tip side of the insert portion immediately adjacent a first end of the corrugated surface, the sleeve includes
a first small diameter portion which is arranged radially outside of the corrugated surface to press the soft pipe toward the corrugated surface,a first large diameter portion which is directly connected to the annular plate portion and has an inner diameter larger than that of the first small diameter portion,a first slope portion which is arranged between the first large diameter portion and the first small diameter portion and is directly connected to the first large diameter portion and the first small diameter portion, the first slope portion having an inner diameter that decreases in distance from the first large diameter portion,a second small diameter portion which is arranged only radially outside of the column surface and not the corrugated surface to press the soft pipe toward the column surface,a second large diameter portion which is arranged between the first small diameter portion and the second small diameter portion and has an inner diameter larger than that of the first small diameter portion, anda second slope portion which is arranged between the first small diameter portion and the second large diameter portion and is directly connected to the first small diameter portion and the second large diameter portion, the second slope portion having an inner diameter that increases in distance from the first small diameter portion; wherein the soft pipe is in direct contact with the insert portion over the entire length of the insert portion such that there is no open space between the soft pipe and the insert portion; the column surface of the insert portion is a cylindrical surface without a groove; each groove of the plurality of annular grooves has a first surface having a small slope and a second surface having a large slope, the small slope being smaller than the large slope, at least one of bottom portions of the grooves which define the corrugated surface is arranged on both outsides of a range of an axial length (La) of the first small diameter portion in an axial direction of the insert portion, at least one of the ribs which define the corrugated surface is arranged within the range of the axial length (La) of the first small diameter portion, at least one of the bottom portions of the grooves which define the corrugated surface is arranged within the range of the axial length (La) of the first small diameter portion, and the column surface has an outer diameter larger than a diameter of the bottom portions of the grooves which define the corrugated surface.