Self-priming pump outlet pipe effect on the performance of self-priming height

2019 - 11 - 20

the self-priming pump test research shows that the self-priming time is associated with a variety of factors, in addition to the structural characteristics of pump itself into the water pipe installation conditions had a great influence on the self-priming performance, it has been reported in some studies, but the installation condition of outlet pipe impact the imbibition, thought is very small, and not to study. From solving practical work, this paper found that in certain situations, the export pipeline will also be influential in the performance of self-priming, this research result will give the pump design, user, help in figure 1, self-priming pump pump outlet conduit and drainage holes on the road, there is a hole and outlet gas water separation chamber, the water out of the impeller along the water flow into the discharge pipe, if the line is long ( More than 1 m) Because the pressure was not enough water will not flow, water from the hole is in the gas separation chamber, gas, isolated from hole into the outlet pipe discharge. If the outlet pipe is very short, FIG. 2) The water pressure can make the water from the outlet pipe erosion, water pump memory will be reduced. When reduced to a certain degree, decrease circulating water is no longer in the pump, but when the water is rarely. For the pump body is separated from the pump outlet, outlet in q has a wide gas-water separation chamber of self-priming pump water pump body as shown in figure 3 b. Water is not easy to come out, watch this kind of structure of self-priming pump, can be seen at the time of imbibition water above the pump body to form a large vortex, it is not easy to overflow, the structure of the outlet pipe of imbibition water impact a. Save water to the self-priming ability influence self-priming pump self-priming gas-water mixing layer which is formed by the impeller, if the water is too little, gas-water mixing layer is very thin, swept volume, less water little, cannot effectively isolate in and out of the mouth, even are interlinked, import vacuum destruction. Figure 4 is different when water pump imported vacuum test results. 62, when the pump can't continuous extraction, water stable vacuum gauge started 21 consecutive extraction, water adding, vacuum degree also increases. Vacuum degree no longer increases. This rule for all kinds of self-priming centrifugal pump are the same, but the different value. Figure 5 is tc - 4 80 pump water imbibition vacuum test results. 4TC- 80 traffic: 7. L / 8, the second pump body of water volume of l3 litres, the factory test, enough water requirements. But the 13 l add water in the pump body is stationary. In use, found that when the tc - 4 80 water period is only 0. 3 m high, imbibition water will rush out and stop check the water drop l40mm, water cut of 72, this can be see from figure 5, 62, the dynamic water imbibition capacity is very low, actually cannot imbibition water. Must be raised out of the water, to accommodate self-priming circulating water pump body came out of it, don't reduce the imbibition water 4 tc - 80 pump water booster to 0. 9 m self-priming ability to discuss the installation height of 8 m minimum water can get the following conclusion from the above analysis, by pumping water with export structure ( Figure 3 a) 。 efficiency is high, but water rushed out of the extremely easily, be sure to match the outlet pipe is high enough, otherwise can cause serious self-priming performance decline. outlet and export is separated, and the trend of the water turns, wrong is export structure ( Figure 3 b) 。 Vortex in the pump body, pump body water loss big but pump water memory is not easy to out of the pump, gas water separation effect is good, pump self-priming performance is good, and is not influenced by the pipe installation height, the pump outlet and export separated two mouth for structure ( Figure 3 c) 。 Imbibition water will be out of the pump, pump self-priming performance is also influenced by the height of outlet pipe installation, the influence degree is less than the structure of the figure 3 a. That is not, to white, such as figure 3. A suction pump, vertical section of the outlet pipe to how high to ensure enough water? Theoretically, outlet pipe of the theoretical maximum volume is equal to the pump body volume, the actual structure of the above 3 a self-priming, pump body gas water separation chamber and the impeller chamber has some water in the loop, only some water into the water pipe, and out of the water orifice flow inlet water separation chamber window. So the volume is less than the actual outlet pipe pump body volume, and the height of the outlet pipe will be decided by the poured on to the height it poured on a highly associated with pump structure, namely the amount of circulating water to a certain height of static pressure loss with the water pipe orifice flow back from the window. The main influence factors is the area of the hole, lower reflux hole area, width of impeller and impeller speed, etc. Specific height test method can be used to determine in the method is to put the outlet with a high outlet pipe ( 2 m or so) Filled with water, the pump body, pump inlet block, boot self-priming pump gas, the water in the tube on how high, this indicates is poured on to the height. This height can also be called the minimum installation height above the water, self-priming performance. discharge and not the runner are interlinked and streamline turn self-priming pump, high water absorption performance dialogue to no effect. discharge and the water pump body white pump flow was interlinked, installed outlet pipe is greater than the minimum water indicates. The minimum installation height and water hole size, the runner back to the hole size and width of impeller, the impeller speed and so on. Can be obtained by test self-priming poured on to the biggest height to determine is a small water installation height.

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