The invention relates to a heat insulation device for a U-shaped
pipe laying
heat exchanger, which is arranged between
straight tube sections of the U-shaped heat exchange pipes of the
heat exchanger. The heat insulation device comprises a body, wherein an arc groove attached to the straight
pipe sections of the U-shaped heat exchange
pipe of the
heat exchanger is axially arranged on the external wall of the body; and the body is made of a material with the coefficient of heat
conductivity of between 0.02-0.06W / (m-K). Compared with the prior art, the heat insulation device has the advantages that the heat
interference phenomenon generated among the straight pipe sections of the U-shaped heat exchange pipe can be avoided through setting the heat insulation device with the coefficient of heat
conductivity of between 0.02-0.06W / (m-K) among the straight pipe sections of the U-shaped heat exchange pipe of the heat exchanger, on the premise that the effective heat exchange area of the U-shaped pipe is not reduced, through ensuring the distance between two pipes of the U-shaped pipe and applying a high thermoresistance recharge material, the amount of heat exchange of the U-shaped pipe is improved by about 15 percent.