Causes of failure of stainless steel mixed flow pump
3D-PIV measurement was carried out on the internal flow field of the stainless steel mixed-flow pump with rear guide vanes. By comparing the flow field at the outlet of the impeller without guide vanes, it was found that the guide vanes can effectively eliminate the The velocity circulation of the fluid flowing out of the impeller outlet, but in the "saddle area" where the operation is not stable, the function of the guide vane to recover energy becomes poor, the flow state inside the guide vane is turbulent, and the pump power is low;
The five-hole spherical probe was used to measure the flow velocity field of the outlet pipe section of the stainless steel mixed-flow pump. spiral flow;
The velocity field before and after the impeller and the pressure distribution near the surface of the pump casing were measured on the open stainless steel mixed-flow pump test bench, and it was found that the movement in the impeller was smoother and there was no significant backflow at the optimal operating point, and the flow rate followed the flow. When the blade stalls, the radial speed at the impeller will suddenly increase, and the hydraulic performance of the stainless steel mixed-flow pump will also suddenly change;
The PIV measurement was carried out on the flow field of the impeller inlet axial surface under different flow conditions. The stainless steel mixed-flow pump impeller has a backflow phenomenon, and as the flow rate decreases, the unstable flow rate in the impeller inlet axial surface gradually expands, the turbulent flow intensity increases, and the axial flow rate increases. The turbulence intensity of the radial velocity is lower than that of the radial velocity, and the turbulence intensity near the impeller casing is higher than that near the hub.
The advantages of vertical stainless steel mixed flow pump
1. The work operation is simple, because the impeller is above the water surface, before the stainless steel mixed-flow pump is recommended, a vacuum pump should be used to fill the pump with water, because the impeller of the vertical pump is usually submerged in water, which can be directly recommended.
2. The equipment area is small, including the driver, the vertical pump only needs half the space of the horizontal pump. Especially in today's large-scale pumps, this benefit is even more outstanding.
It is worth noting that the vertical length of the vertical stainless steel mixed-flow pump is long, the hoisting height of the crane during disassembly and assembly is high, and there must be sufficient space above the pump. This is a defect of the vertical stainless-steel mixed-flow pump. However, the stainless steel mixed-flow pump almost All equipment is outside so it won't be a problem.