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Deep well pump selection:
(1) Select a multi-stage submersible pump based on the maximum allowable extraction volume of the source well. The pump's pumping volume must be consistent with the actual water inflow in the well. The pumping capacity must be equal to or slightly less than the actual extraction volume of the source well, otherwise strong pumping will inevitably occur, which will not only shorten the service life of the deep well submersible pump, but will also filter The net has been destroyed, causing the gushing of sand to continue, even causing the well to be scrapped.
(2) The diameter of the deep well submersible pump must be consistent with the diameter of the wellbore. In order to make the deep well pump get up and running smoothly, the groundwater has room for rapid collection when pumping, and the resistance of the water pump can be reduced by the resistance. The diameter of the wellbore of the lift pipe and the pump body should be larger than the maximum diameter of the pump body by 20-40mm, ie The annular gap between the maximum diameter of the pump body and the borehole wall must be 10 to 20 mm in order to extend the service life of the submersible pumps in wells and deep wells.
(3) Deep well submersible multi-stage pump head down well position The pump head of the deep well submersible pump must not be placed in the position of the filter tube (flower tube), but must be placed in the well wall tube (real tube) position, otherwise it will surge when pumping. Sand will not stop or destroy the well. According to the interpretation of the electric measurement curve of the exploration hole, it is decided by both wells A and B according to the hydrogeological conditions (buried depth of aquifer, aquifer thickness, aquifer lithology) and pump operation conditions of the well and adjacent water wells. The well's well construction structure (well diameter, manifolds, real pipe location), well completion depth, and pump selection ensure that no problems occur in the future when the pumps and pumps are operated.
(4) According to the allowable exploitation amount of the water source well, select the deep well submersible pump, determine the specifications and model of the deep well submersible pump according to the inflow of the water source well under the conditions allowed by hydrogeology, so as to determine the reasonable structure of the water source well.
(5) Select the deep well submersible centrifugal pump according to the total head loss. According to the deep well submersible pump to pump groundwater from the pump head to the surface pool or water tower, the total head pressure required to select the deep well submersible pump diameter, head (stage) and power. Water pressure increases in proportion to the number of impellers flowing through it. The deep well pump's impeller is immersed in water and only lifts without suction. The rated head and the actual operating head of the pump must not differ too much and must not be higher than 25% of the actual head. The high pump lift, the required motor power, easy to cause the pump to have a larger string, the light wear the impeller and the leaf shell, the weight of the bearing in the shell (from the limit role) easy to stick with the pump coupling, Causes the pump not to run and the motor overload winding will burn out.
If a high-lift pump is used for low head pumping, its flow will inevitably increase, even outside the operating range, with large flow, low efficiency, and high energy consumption. On the surface, it seems that pumping speed can be increased. Pumping efficiency is improved, but it is actually not worth the gains. It is not advisable to promote it. When the flow rate of the pump reaches or exceeds the maximum extraction volume of the well, the structure of the filter layer outside the well pipe will be damaged. In light cases, a large amount of sand will enter the well and the wellhead Sinking near the ground will endanger the safety of the well. In addition, the pump in the long-term high head, large flow, low efficiency, high-speed operation, the water flow rate of the pump is accelerated, will destroy the chemical balance of groundwater, so that dissolved substances in the water precipitation, precipitation in the filter inlet gap or gap , Speed ​​up scaling, resulting in plugging of the filter, and increasing clogging with time, the pump will be subject to corrosion and cavitation and advance the use and characteristics of deep well pump:
The QJ well submersible pump is an energy-saving product designed according to national standards. It is widely used in farmland irrigation, water supply and drainage of industrial and mining enterprises, and people and livestock water in plateaus, mountain areas, and so on.
This type of pump is composed of a QJ submersible pump and a YQS-type submersible motor, and is submerged under water for operation. The utility model has the advantages of simple structure, small size, light weight, convenient installation and maintenance, safe operation, reliability, high efficiency and energy saving.
The QJR series well heat-resistant submersible pump is a heat-resistant submersible electric pump directly integrated with a well-contained heat-resistant submersible three-phase asynchronous motor. The heat-resistant water temperature can reach 100°C. It is a submerged well and extracts geothermal energy. Water is an effective tool; geothermal is one of the cheapest, cleanest, most inexhaustible new energy sources and is now widely used in heating, medical, bathing, breeding, planting, industry and agriculture, factories and mines, entertainment services, health facilities, etc. aspect. It has a pump unity, simple structure, reliable operation, no noise, excellent performance, high unit efficiency, easy installation and maintenance; and has many advantages such as heat resistance, anti-corrosion, anti-aging, etc. It is the latest product of the embankment taking geothermal water.
Deep well pump types:
1, vertical vertical use, such as in the general wells;
2, oblique use, such as in the slope of the mine lane;
3, horizontal use, such as the use of deep well pump in the pool of work:
The suction tube and the pump must be filled with liquid before starting the pump. After the pump is turned on, the impeller rotates at a high speed, and the liquid rotates with the blades. Under the action of centrifugal force, it flies out of the impeller and shoots out. The ejected liquid gradually slows down in the diffusion chamber of the pump casing, the pressure gradually increases, and then the pump Outlet, discharge pipe outflow. At this time, the vacuum is formed in the center of the blade due to the liquid being thrown around to form a vacuum and low pressure area with no air and no liquid. The liquid in the liquid pool flows into the pump through the suction pipe under the action of atmospheric pressure at the pool surface. It is continuously pumped up from the liquid pool and continuously discharged from the discharge pipe. 
Deep-well pump applications and its selection of several major points
The most important feature of deep well pump is that the motor and the pump are integrated into one pump. It is a kind of pump immersed in the underground water well for pumping and conveying water. It is widely used in farmland irrigation and drainage, industrial and mining enterprises, urban water supply and drainage and sewage treatment. Since the motor is submerged in water at the same time, the structure requirements for the motor are more special than those of the general motor. The structure of the motor is divided into four types: dry, semi-dry, oil-filled, and wet.