Flame tube outer ring, combustion chamber and mounting structure and method

The invention provides a flame tube outer ring, a combustion chamber, a mounting structure and a mounting method. The installation structure is used for installing an ignition electric nozzle on an outer ring of a flame tube and comprises a lining, a first connecting piece and a second connecting piece, the positioning ring comprises a first end and a second end, and the first end and the second end limit a notch of the positioning ring; the shell is used for being integrally arranged with the flame tube outer ring and comprises a first part and a second part which are connected in the axial direction, the first part provides a first containing space and is used for containing the ignition electric nozzle, and the second part provides a second containing space and is used for containing the lining and the positioning ring; wherein the positioning ring is arranged on the mounting part of the lining in a sleeving mode, the second ring and the extending part of the lining are located on the two axial sides of th