离心泵的轴向力径向力平衡资料.ppt

Hydraulic forces and balances in centrifugal pumps members：钱培、范佳晨、陈桢、王琪、潘同建 Brief introduction of centrifugal pumps 陈桢 Brief introduction of centrifugal pumps Structure of centrifugal pumps Reasons of the hydraulic forces Effects of hydraulic forces Balance or reduce of hydraulic forces Structure of centrifugal pumps Reasons of the hydraulic forces For axial thrust： 1、Force difference between hub and shroud 2、Dynamic reaction force 3、For vertical pumps，gravity is the part of axial thrust. For radial force: 1、Deviate from the designed point 2、Dynamic reaction force 3、Horizontal pumps，gravity Effects of hydraulic forces Axial thrust： 1、large axial thrust，shaft hard to bear 2、Vibration，abrasion Radial thrust： Increase the burden on the shaft，deform and even fracture，vibration，reduce the life of pumps Balance or reduce of hydraulic forces For axial thrust： 1、Use the impeller symmetry to counterpoise （双吸泵） 2、Change the shape of the impeller （背叶片） 3、Use thrust bearing（推力轴承） 4、Balancing device（平衡盘、平衡鼓、两者结合） For radial thrust： 1、for big single-stage pump, use double volute（双蜗壳） 2、Pressurized water chamber are arranged by 180° Causes of radial force Radial thrust on the impeller 1.When the Centrifugal pump is under the optimal conditions, the pressure in the volu