双吸式离心泵体的材质为锡青铜ZCuSn3Zn8Pb6Ni1，泵体结构复杂，液压试验压力3.5 MPa历时5 min，不允许有渗漏现象。讨论了锡青铜的铸造特性，并结合泵体的结构特点，对可能导致泵漏的缩松、缩裂及气孔等铸造缺陷进行了分析，并对早期采用的平做立浇砂型铸造工艺进行了介绍。在近期泵体的生产中对平做立浇工艺进行了改进，采用了平做平浇砂型铸造工艺，具有显著优点，铸件质量良好，虽然工艺出品率略低于平做立浇工艺，但泵漏率也略有降低，关键是造型操作简便，对砂箱无特别要求，生产效率大大提高。
Double suction centrifugal pump body is made of tin bronze ZCuSn3Zn8Pb6Nil, and it has a complicated structure. For the centrifugal pump body, leakage is not allowed under the pressure of 3.5 MPa for 5 min in the hydraulic test. In the paper, based on the casting properties of tin bronze and the structural characteristics of the body, the casting defects such as dispersed shrinkages, shrinkage cracks and pores were analyzed, and the technology of sand casting process with horizontally molding and vertically pouring adopted at the early stage of production was introduced. In the recent production of the pump body, the casting process has been improved, and the sand casting process with horizontally molding and pouring was adopted, which has remarkable advantages： the casting quality is good. Although the yield of the improved process is slightly lower than that ofthe casting process with horizontally molding and vertically pouring, the rate of the pump leakage is reduced, and the molding operation is simple and convenient, furthermore, there are no special requirements on the sand boxes. So the production efficiency is greatly improved.
centrifugal pump body