渣浆泵的泵壳通常铸成蜗壳形，其过水部分要求有良好的水力条件。叶轮工作时，沿蜗壳的渐护断面上，流量是逐渐增大的，为了减少水力损失，在泵设计中应使沿蜗壳渐扩断面流动的水流速度是一常数。 水由蜗壳排出后，经锥形扩散管而流人压水管。蜗壳上锥形扩散管的作用是隆低水流的速度，使流速水头的一部分转化为压力水头。

泵壳的材料选择，除了考虑介质对过流部分的腐蚀和磨损以外，还应使壳体具有作为耐压容器的足够的机械强度。

The pump casing of the slurry pump is usually cast into a volute shape, and its water passage requires good hydraulic conditions. When the impeller is working, the flow rate gradually increases along the gradually expanding section of the volute. In order to reduce hydraulic losses, the water flow speed along the gradually expanding section of the volute should be kept constant in pump design. After being discharged from the volute, water flows into the pressure pipe through a conical diffusion tube. The function of the conical diffusion tube on the volute is to lower the velocity of the water flow, converting a portion of the velocity head into a pressure head.

The material selection of the pump casing should not only consider the corrosion and wear of the medium on the overflow part, but also ensure that the casing has sufficient mechanical strength as a pressure vessel.