Heat exchanger for boiler

The utility model provides a heat exchanger for boiler comprises a plurality of heat transfer units, the heat transfer unit includes the sleeve intermediate layer that inner tube, urceolus and interior urceolus constitute, inner tube section of thick bamboo wall is provided with a plurality of helical corrugations, sleeve intermediate layer water transport line orientation and inner tube section of thick bamboo water -logging operation opposite direction, simple structure is compact, heat exchange efficiency is high, be convenient for production and maintenance. 本实用新型提供了种热水锅炉用换热器，由若干换热单元组成，所述换热单元包括内筒、外筒及内外筒构成的套筒夹层，所述内筒筒壁设置有若干螺旋波纹，所述套筒夹层水运行方向与内筒筒内水运行方向相反，结构简单紧凑、换热效率高、便于生产和维修保养。