Two-in-one back bending elbow

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. 本发明提供一种二合一回弯弯头，其为一体结构，内部具有开口同向的∈形流道，∈形流道分别与两个入口接口与一个出口接口相互连通，两个入口接口相邻布置，并且与出口接口均同向布置。本发明的二合一回弯弯头不占用过多高度空间，因而有效地延长了两个第一程管的直管长度，增加了比表面积，同时有效减少了部件数量和焊缝数量，降低焊缝开裂风险。