The key point of model selection of high lift deep well pump

　high lift deep well pumpFive key points of model selection

(1) according to the main allowable production of water wells to select deep diving multistage centrifugal pump. The pumping capacity of the centrifugal pump must be consistent with the specific depth drop in the deep water well. The pumping capacity must be equivalent to or slightly lower than the specific production capacity of the water source well. Otherwise, it will inevitably lead to strong water pumping, which will not only reduce the service life of the high-lift deep well pump, but also destroy the filter screen when it is obvious, resulting in sand gushing and even damage to the deep water well.

(2) The aperture of the high-lift deep well pump must be consistent with the aperture of the well bore. In order to make the deep well pump successful, the surface water has space to gather quickly when pumping water, and can reduce the operation damage of the centrifugal pump without frictional resistance. It is stipulated that the well bore diameter at the position of the running water pipe and the pump casing is much larger than the larger bore diameter of the pump casing by 20~40mm, I .e. the annular gap between the larger bore diameter of the pump casing and the wellbore needs to be 10~20mm, so as to increase the service life of the deep well.

(3) The pump impeller of the deep-water well deep-water multistage centrifugal pump must not go down to the water filtration pipe (sleeve valve pipe), but must go down to the well wall pipe (solid pipe), otherwise sand will gush when pumping water, which will not only destroy the deep-water well. According to the electrical logging curve of the probe hole, the well completion structure (well diameter, sleeve valve pipe, solid pipe position), well completion strength and selection of centrifugal pump should be determined by well completion A and B, according to the hydrogeological conditions of the well and adjacent water source wells (buried depth of fissure water, thin thickness of fissure water, fissure water rock layer) and the operation status of centrifugal pump, so as to ensure the future, there are no other problems in the operation of the lower pump and the centrifugal pump.

(4) According to the allowable production of water source wells, selecthigh lift deep well pumpUnder the allowable conditions of geological structure and according to the depth of the water source well, the specifications and models of the high-lift deep well pump are clarified, and then the effective structure of the water source well is clarified.

(5) according to the total tensile damage selection of deep water well deep submersible centrifugal pump. The diameter, pump head (grade) and output power of the high-lift deep well pump should be selected according to the total tensile damage required to lift the surface water from the pump impeller to the road reservoir or cooling tower. The pressure rises in proportion to the number of wind wheels flowing through. The centrifugal impeller of the deep well pump penetrates into the water, and only the pump head has no suction. The rated pump head and the specific operation pump head of the centrifugal pump should not differ too much, and should not be higher than 25% of the specific pump head. The head is high, and the rated power of the motor is large, which is easy to cause the centrifugal water pump to have a very large upper string, which may damage the centrifugal impeller and the blade shell, and the rolling bearing (which plays a positioning role) in the shell is easy to stick to the pump coupling. As a result, the centrifugal water pump cannot be operated, and the motor will burn out due to overload winding.

If a high-lift pump is used to pump water with low pump lift, its total flow rate is bound to expand, even outside the working range, under the conditions of high flow rate, uneconomical scale and high pollution. On the surface, it seems that it can accelerate the water pumping rate and improve the high water pumping efficiency, but in fact it is not suitable for advocacy because of small losses and big losses. Because the flow rate of the pump even exceeds the main production capacity of the well, the structure of the filter layer outside the well pipe will be damaged, or a large amount of sand will be fed into the well, or the road surface around the wellhead will move down, which will seriously endanger the safety of the well.