A water chiller is a water cooling device that can provide constant temperature, constant flow, and constant pressure. The principle of a water chiller is to inject a certain amount of water into the internal water tank of the machine, cool the water through the cooling system of the water chiller, and then inject the low-temperature frozen water into the equipment that needs to be cooled by the water pump inside the machine. The frozen water takes away the heat inside the machine, and then returns the high-temperature hot water to the water tank for cooling. This cycle of exchange cooling achieves the function of cooling the equipment.