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A fire pump is a type of water pump, and its working principle is the same as that of a regular water pump. The internal structure of fire pumps is similar to that of other water pumps, except that fire pumps have higher requirements, and better materials are needed for them. A fire pump consists of a motor and a pump, which are connected through a coupling to form a rigid connection and become one unit. The fire pump consists of a stator part and a rotor part. The stator part of a fire pump refers to components such as the water inlet section, middle section, guide vanes, water outlet section, and seals. The joints between the inlet section, middle section, and outlet section are sealed using rubber O-rings or metal O-rings. The rotor part of a fire pump refers to components such as the shaft, impeller, and balance drum. The lower end of the rotor is the impeller, while the upper end is equipped with angular contact ball bearings. The majority of the axial force in the fire pump is absorbed by the balance drum; the remaining small amount of axial force is taken up by the angular contact ball bearings. The impeller is an important component of fire pumps. Fire pumps are used in emergency situations and are rarely operated on a regular basis; therefore, to prevent the pumps from failing to function properly due to rust, the impellers of such pumps are typically made of stainless steel or copper, materials that are resistant to rust. Typically, water pumps use cast iron impellers; therefore, the material of the impeller is also an important factor in distinguishing fire pumps from ordinary water pumps. Article source: www.liangongpv.com