The pump shell collects the liquid from the impeller and transforms the kinetic energy of some of the fluid into pressure energy, which eventually leads the fluid to the secondary impeller or guide outlet. The shell structure mainly has spiral shape and ring. The spiral pressure water chamber not only collects the function of liquid, but also converts some liquid kinetic energy into pressure energy in the spiral tube. Spiral pressure water chamber has the characteristics of making convenience and high efficiency. It is suitable for single-stage single, single-stage double suction centrifugal pump and multi-stage open-type centrifugal pump. The pump shell of single-stage centrifugal pump is mostly spiral volute pump shell. The annular pressurized water chamber is adopted in the outlet section of the section stage pump. The flow area of the annular pressure chamber is equal, so the velocity is not equal everywhere. Therefore, the efficiency is lower than the spiral water chamber when it is designed and not designed. Some of the pump shells also have a fixed guide blade, called a guide vane pump case. |
