How to adjust the sealing clearance before the impeller of the self-priming pump?
3. Do not inhale. When the water inlet of the suction pipe is not flooded enough, the inlet makes a great deal of air due to the vortex produced by the water at the inlet. When serious, will destroy the pump normal water absorption. This kind of circumstance, see in bibulous point more, bibulous below the condition of water level of river course. In order to avoid the sump vortex, the intake air suction pump, submerged depth of water pipe at the lowest level of import should be not less than 0.5-1.0m, if the submerged depth can not meet the requirements, it should be at the level of the pipe end baffle device.4, in order to prevent the suction pump suction bottom of the sediment, and make self-priming pump work has good hydraulic conditions, should comply with the following provisions:A. water pipe imports to the bottom to the vertical distance (i.e. hanging height) should be used for 0.6-0.8D, D water pipe bell (or the end of valve) part of the expanded diameter 1.3-1.5 times, D is usually taken as the diameter of the suction pipe.
The inlet pipe of the suction pump usually works under negative pressure, so the inlet pipe of the self-priming pump is airtight, non gas and non suction. Therefore, the following measures are often adopted:1, in order to ensure that the suction pump inlet pipe is not leak, the requirements of the pipe must be tight. Therefore, the imported pipeline is usually made of steel pipe. When the steel pipe is buried in the soil, it should be coated with asphalt anti-corrosion layer. When the cast iron pipe is used, the joints must be tight during construction.2, to ensure the pump inlet pipe does not accumulate gas, the inlet pipe along the flow direction should be a continuous upward slope, generally more than 0.005, produce airbag to avoid, should make the highest point along the water pipeline at the top of the suction pump. The inlet pipe of the pump suction inlet section should be greater than the general section, reducing pipeline pipe on the eccentric reducer (i.e. eccentric reducer), maintain reduction tube above the level of self suction centrifugal pump inlet should not directly connected with an elbow, a straight pipe should be installed between the two.
3., some self suction pump casing has a special matching sealing ring, wear and tear, in exchange for small gap. There is no special sealing ring of the self-priming pump, you can adjust the impeller axial position to adjust the gap, but to test various parameters repeatedly, it is very troublesome, if the adjustment of technical requirements, the best, a success. There is also a way to adjust the sealing space by adjusting the bearing position, not too much.
Self suction pump sealing clearance adjustment method is as follows:1. self suction pump housing has a special matching seal ring, worn, can be renewed to reduce the gap. The self suction pump without special sealing ring can adjust the clearance by adjusting the axial position of the impeller.
