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渣漿泵的泵殼通常鑄成蝸殼形，其過水部分要求有良好的水力條件。葉輪工作時，沿蝸殼的漸護斷面上，流量是逐漸增大的，為了減少水力損失，在泵設計中應使沿蝸殼漸擴斷面流動的水流速度是一常數。 水由蝸殼排出后，經錐形擴散管而流人壓水管。蝸殼上錐形擴散管的作用是隆低水流的速度，使流速水頭的一部分轉化為壓力水頭。

泵殼的材料選擇，除了考慮介質對過流部分的腐蝕和磨損以外，還應使殼體具有作為耐壓容器的足夠的機械強度。

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.