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Description of hydraulic loss of sewage centrifugal sewage pump

Author: Source: Posted On: 2019/1/31 9:12:17

  To lead the trend of the domestic pump industry, accurately grasping the development trend of pump technology is the basic skill. The development of pump technology, like the development of other industries, is driven by market demand. Nowadays, history has entered the 21st century. Under the background of the huge demand for high-tech development in the fields of environmental protection and electronics, and the world's sustainable development, many industries or fields including the pump industry. Both have brought about rapid changes and developments in technology. The hydraulic loss of the sewage centrifugal sewage pump has impact loss, vortex loss and friction loss along the path.

  First, the impact loss

  Each pump has its own design flow. When the consumption is under the design flow condition, the flow at the inlet enters the impeller along the vane, so no impact with the vane occurs, and the outlet flow does not occur. The impact of the pump casing is then more efficient. However, when the flow rate deviates from the design condition, the direction of the liquid flow deviates from the direction of the blade, causing an impact.

  Second, the vortex loss

  In the water pump, the flow cross section is a very complicated spatial section. When the liquid passes here, the flow rate is too small and the direction is constantly changed, so that vortex loss is inevitably generated. In addition, when the overcurrent surface has sharp corners, burrs, and dead water, the vortex loss is also increased.

  Third, the friction loss along the way

  Due to the roughness of the over-flow surface of the pump and the viscosity of the liquid, the frictional resistance loss occurs when the liquid swims. The size of the loss is expressed by the following formula;

  Hm=AQ2 where A is the coefficient.

  Painted on the coordinates, it is a parabola with the origin as its apex.

  In the hydraulic loss of each part, the hydraulic loss in the impeller is the largest, accounting for about half of the total black and white loss; secondly, the hydraulic loss at the turn of the vane, accounting for about 1/4 of the total hydraulic loss, and the remaining 1/ 4 Hydraulic loss, loss in the impeller to the guide vane, the guide vane diffusion part, the anti-guide vane to the impeller inlet and other parts.

  In order to reduce the hydraulic loss of the pump, the cross-section of the flow should be changed gently and the speed should be reasonable. And choose the appropriate impeller, vane type and entrance and exit placement angle. In addition, the surface finish of the overcurrent components should be increased.

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