2. The main parts of the pump are: pump body, pump cover, impeller, shaft, double suction sealing ring, shaft sleeve, bearing, etc. Except the shaft is made of high-quality carbon steel, the rest are mostly cast iron. The pump body and the pump cover form the working chamber of the impeller, and the inlet and outlet flanges are provided with screw holes for installing vacuum gauges and pressure gauges, and the lower flanges of the inlet and outlet flanges are provided with screw holes for draining water. After static balance inspection, the impeller is fixed by the shaft sleeve and the shaft sleeve nuts on both sides, and its axial position can be adjusted by the shaft sleeve nuts. The axial force of the impeller is balanced by the symmetrical arrangement of its blades, and part of the residual axial force may be borne by the bearing at the coaxial end.
3. The pump shaft is supported by two single-row radial ball bearings. Bearings are installed in bearing bodies at both ends of the pump body and lubricated with butter. The double suction sealing ring is used to reduce the water leakage from the pump pressure chamber to the suction chamber. The water pump is directly driven by the motor through the coupling. The shaft seal is sealed with soft packing. In order to cool and lubricate the sealed cavity and prevent air from leaking into the pump, there is a water seal ring between the fillers. When the pump is working, a small amount of high-pressure water flows into the packing cavity through the water seal pipe, which plays a water seal role.
As an important form of centrifugal pump, double-suction pump is widely used in engineering because of its high lift and large flow. The impeller of this pump is actually composed of two back-to-back impellers, and the water flowing out of the impellers is merged into a volute. Tian Hong brand double suction pump has the following characteristics: it is equivalent to two single suction impellers with the same diameter working at the same time, and the flow rate can be doubled under the same impeller outer diameter; The horizontal opening in the middle of the pump shell is convenient for inspection and maintenance.
At the same time, the inlet and outlet of Tian Hong brand double-suction pump are in the same direction and perpendicular to the pump shaft, which is beneficial to the arrangement and installation of the pump, inlet and outlet pipes; The impeller of double-suction pump has symmetrical structure, no axial force and stable operation. In the areas along the Yellow River in China, most pumping stations with large flow and high lift use Tianhong brand double-suction centrifugal pump. Huinanzhuang Pumping Station of the Middle Route of South-to-North Water Transfer Project also uses double suction pumps for water supply.