Structure of combustor of vacuum hot water boiler

The utility model discloses a structure of a combustor of a vacuum hot water boiler, which comprises a barrel-shaped furnace body, wherein two ends of the furnace body are respectively provided with a combustion port and a smoke exhaust port, and the wall of the furnace is provided with a section of expansion joint which consists of a plurality of wave-shaped arris that are arranged in a concave-convex manner; and the width of the expansion joint is one twentieth to one tenth of the axial length of the furnace body. By adopting the structure of the combustor, when the combustor is heated and expanded, the deformation of the axial length is compensated by the expansion joint, so that the axial length of the combustor is maintained, and the external shell of the vacuum hot water boiler is guaranteed not to deform. Furthermore, the expansion joint with the wave-shaped arris structure has a turbulent flow act on the flame in the combustor, so that the flame can stay longer in the combustor, and the temperature of