Method for preparing evaporator for reducing water condensing capacity and evaporator

A method for preparing an evaporator for reducing water condensing capacity, comprising steps of:

• step A:
• selecting fins:
• according to the size of the evaporator, selecting a corresponding number of fins, stamping bumps on each of the fins, and forming first through holes in the bumps;
• step B:
• stacking:
• aligning and successively stacking the multiple fins, with detachable backing plates provided between two adjacent fins, making one ends of the backing plates abut against the bumps and the other ends of the backing plates abut against ends of the fins away from the bumps, and forming second through holes on the backing plates at positions corresponding to the first through holes;
• step C:
• arranging tubes:
• selecting copper tubes same in number as the number of the first through holes on a single fin, and making the copper tubes pass through the first through holes and the second through holes to pass through the fins;
• and
• step D:
• expanding tubes:
• sealing one end of each of the copper tubes, conveying a liquid medium having a pressure of 6 to 10 MPa into the copper tube from the other end of the copper tube by a medium conveying device, and maintaining the pressure for 20 to 100 s after the pressure in the copper tubes reaches a set range, so that the copper tubes are expanded in outer diameter to be in interference fit with the first through holes.