Self priming pump suction is not the reason and treatment of water, what are the reasons?
Self priming pump water inlet pipe and pump body with air
(1) some users before the start of the pump does not fill enough water, sometimes look like the water has been poured from the vent overflow, but did not turn the pump shaft to the air completely discharged, resulting in a little air left in the water pipe or pump body.
(2) in contact with the pump inlet of the horizontal application of reverse flow direction, fell more than 0.5% slope, connect one end of the highest import pumps, do not completely level. If the upward tilt, will be retained within the inlet air, reduce water pipes and pumps in the vacuum, the impact of water.
(3) self suction pump wine packing has been used for long-term wear or packing pressed too loose, discharge gap caused by the large amounts of water from filling with the shaft sleeve, the external air gap into the pump from the inside, the effect of water.
(4) because of the long-term potential of the water pipe, the pipe wall corrosion appear holes, water pump works, the water continued to decline, when these holes exposed, the air enters the people from the hole into the water pipe.
(5) there is a crack in the water inlet pipe elbow of the chemical self priming pump, and the tiny gap between the water inlet pipe and the water pump connection place. It is possible to make the air enter into the water inlet pipe.
But to solve a series of problems of the pump of the most fundamental is to buy a good quality. At present, self-priming pump wine product variety, quality is uneven in quality on the market, how to choose the appropriate agricultural self suction wine pump is a difficult problem to solve. Friends can refer to the following points:
1, to adjust measures to local conditions to choose from the suction pump, the commonly used self priming pump according to the principle of action is divided into the following three kinds:
A. gas-liquid mixing type self-priming pump working process: because of the special structure of self suction pump of the wine, the pump stops after the pump body has a certain amount of water, the pump starts up again due to the rotation of the impeller and the suction pipe of the air and water are mixed, and is discharged to the gas water separation chamber, gas overflow gas water separation chamber at the upper part, the lower part of the water return to the suction line and the impeller, the remaining air mixture until the pump and the gas inhalation tube completely discharged, the self suction, and normal pumping.
B. ring self-priming pump water wheel is a ring round the water pump impeller and the combination of a shell with water from the gas ring round to achieve self absorption. When the pump to work, can cut off the water through the valve and pump impeller ring round channel, and release the water within the liquid ring round.
C. jet type self priming pump, by the centrifugal pump and jet pump (or jet) combination, depending on the injection device, in the nozzle caused by vacuum suction.
2, to the appropriate excessive water pump (self priming pump).
After determining the type of pump, to consider their economic performance, with particular attention to the pump head and flow and the choice of motive power. We must pay attention to, pump signs marked on the head (total head) and the use of the water head (the actual head) there is a difference, this is due to the flow of water through pipes and pipe near there will be some pressure loss. So, the actual head to 10%~20% lower than the total lift, water is also reduced.
Therefore, in practice, only by the sign note head and flow estimation 80%~90%, the choice of matching power pump, power can be indicated on the label, in order to make the pump start fast and safe use, the engine power can also be slightly larger than the pump power required, generally around 10% higher if appropriate; have power to buy water, we can purchase power by power machine with matching pumps.
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