Multistage centrifugal pump guide vane and machining method thereof

The invention provides a multistage centrifugal pump guide vane. The guide vane is a curve type guide vane, the curve type guide vane and a middle section are combined together to form a flow channelwhich allows a fluid to pass therethrough between the curve type guide vane and the middle section, the curve type guide vane comprises a front guide vane, a rear cover plate, a reverse guide vane anda vane-free curve formed by flow-passing from the front guide vane to the reverse guide vane, the front guide vane and the reverse guide vane are arranged at the front face and the rear face of the rear cover plate respectively to form a whole with the rear cover plate, an anti-rotation pin hole is formed in a blade of the reverse guide vane in the axial direction, and an anti-rotation pin whichis used for preventing a rotor from driving the guide vanes to rotate is arranged in the anti-rotation pin hole. The invention further provides a machining method of the multistage centrifugal pump guide vane. According to the