This equipment is a machanical draft tupe cooling equipment,its operating principle is:Press the water that needed to be cooled down into the cooling water device,and spray the water evenly to the fillers through the device,hot water fall down from fillers and become water film on the filler.At the same time, unsaturated cold air are drawn from the bottom to the inside tower bydraught fan, and go into and flow in the filler gap,then hot water and unsaturated air exchanged here which turn the unsaturated cold air into satureted hot air,and draw out the tower by draught fan, repeating the cycle thus to lower the water temperature.