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The function of cooling tower water distribution system is to sprinkle hot water evenly on the whole packing device. The basic requirements for the water distribution system are as follows: within a certain range of water quantity, the water distribution is uniform, the water resistance is small, the ventilation power is small, and the maintenance is easy. There are three types of water distribution system: pipe type, trough type and pool type. Tubular water distribution system is easy to install and widely used in large and medium cooling towers. The pipe type water distribution system is divided into fixed type and rotary type. The rotary water distributor is composed of water supply pipe, rotary body and water distribution pipe. The water supply pipe is fixed and connected with flange, and connected with rotator through bearing, with sealing and sealing facilities. The rotating body is used to bear all the weight of the water distributor and make the distributor rotate. A number of water distribution pipes are connected at equal distance along the radiation direction around the rotating body. The water flows out through the small holes on the water distribution pipe and pushes the water distribution pipe to rotate in the opposite direction to the water outlet, so as to evenly sprinkle the hot water on the drenching filler