The invention discloses a preparation method for an evaporating
pipe of a flooded
evaporator. The preparation method comprises the steps that spiral internal teeth are rolled on the inner wall of a
copper pipe, and then the inner surface and the outer surface of the
copper pipe are cleaned and dried; the
copper pipe is sleeved with a fine copper
powder particle limiting pipe, introduced into a
sintering furnace to be sintered with protective gas, discharged out of the
sintering furnace and cooled, the fine copper
powder particle limiting pipe is pulled away, and a fine copper
powder particle capillary-structure layer is combined with the outer wall of the copper pipe; the fine copper powder particle capillary-structure layer is sleeved with a coarse copper powder particle limiting pipe, introduced into the
sintering furnace to be sintered with protective gas, discharged out of the sintering furnace and cooled, the coarse copper powder particle limiting pipe is pulled away, a coarse copper powder particle capillary-structure layer is combined with the outer side of the fine copper powder particle capillary-structure layer, and a pipe blank is obtained; and the pipe blank is introduced into the sintering furnace to be sintered with protective gas, discharged out of the sintering furnace and cooled, and the evaporating pipe of the flooded
evaporator is obtained.
Thermal contact resistance between the copper pipe and the
fine powder particle capillary-structure layer as well as between the copper pipe and the coarse powder particle capillary-structure layer is avoided, and the heat exchange performance is good; a
heat transfer coefficient is increased; and the maximum effect of the
thermal conductivity is achieved.