Pagoda type joint for oil cooler

The invention relates to a connecting piece for a mechanical device, in particular to the structure of a pagoda type joint for connecting refrigeration equipment with an oil-proof rubber oil pipe of an oil cooler. A conical threaded connecting section, an outer hexagonal fixed plate, a plurality of circles of rectangular grooves, rectangular convex rings and a tapered retaining ring at the tail end are sequentially arranged on the outer wall of a round tube from one end, wherein the rectangular grooves and the rectangular convex rings are arranged at intervals; the number of the rectangular grooves is equal to that of the rectangular convex rings, or the number of the rectangular grooves is 1 more than that of the rectangular convex rings; the lengths of the rectangular grooves and the rectangular convex rings along the axial direction of the round tube are equal. The pagoda type joint for the oil cooler has the advantages of simple and reasonable structure, machining mode similarity with a product in the prior art, no cost increase, convenience in operation, easiness in sleeving, in-place clamping and fastening, reliable compactness, high efficiency, almost no oil leakage and the like, and has high popularization and application value, the first-pass yield of assembly can be effectively improved, and the subsequent maintenance cost can be lowered.