Two-in-one back bending elbow

Abstract

The invention provides a two-in-one back bending elbow. The two-in-one back bending elbow is of an integrated structure, an E-shaped flow channel with openings in the same direction is formed in the two-in-one back bending elbow, the E-shaped flow channel communicates with two inlet connectors and an outlet connector respectively, the two inlet connectors are arranged adjacently, and the two inletconnectors and the outlet connector are arranged in the same direction. The two-in-one back bending elbow does not occupy too much height space, so that the straight pipe length of two first-pass pipes is effectively increased, the specific surface area is increased, meanwhile, the number of parts and the number of welding seams are effectively reduced, and the cracking risk of the welding seamsis reduced.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a two-in-one return elbow used in tube furnaces in petrochemical production. Background technique [0002] Most of the two-in-one pipe fittings used for furnace tube connection in various tube furnaces are "Y"-shaped structures. [0003] There are also "Y-type two-in-one pipe fittings" in some tube furnaces, which are used for the inlet tube side or outlet tube side of the multi-pass coil. [0004] The "Y" structure of the two-pass and one-pass return bending coil, in order to achieve 180° return bending, the first tube pass and the second tube pass are both "'Y-shaped two-in-one pipe fittings' (+ straight pipe) +180°return elbow" form for connection. [0005] This connection method using "Y-shaped two-in-one pipe fitting (+ straight pipe) + 180° return elbow", if the straight pipe structure is used, the length of the double pipe is shortened in a limited space, which affe...

AI Technical Summary

Problems solved by technology

[0005] This connection method using "Y-shaped two-in-one pipe fitting (+ straight pipe) + 180° return elbow", if the straight pipe structure is used, the length of the double pipe is shortened in a limited space, which affects the heat transfer effect; If the 'Y-shaped two-in-one pipe fitting' and the 180° return elbow combined pipe fitting are selected, the welding of two relatively rigid pipe fittings will bring a high risk of weld cracking, and the binding force on the furnace tube is relatively large, which is easy deform the furnace tube

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