What Is a Water Well Pump?

The biggest feature of the deep well pump is that the motor and the pump are made into one body. It is a pump immersed in underground water wells to pump and transport water. It is widely used in farmland drainage and irrigation, industrial and mining enterprises, urban water supply and drainage and sewage treatment. Because the motor is submerged into the water at the same time, the structural requirements for the motor are special than ordinary motors. The structure of the motor is divided into 4 types: dry, semi-dry, oil-filled, and wet.

Before turning on the pump, the suction pipe and the pump must be filled with liquid. open

Deep well pump operation technology

1. Deep well pumps should be used in fresh water sources with sand content less than 0.01%. A pre-moisturizing tank is set in the pump room, and the capacity should meet the pre-moisturizing capacity for one start.

2. For newly installed or overhauled deep well pumps, the clearance between the pump casing and the impeller should be adjusted. The impeller must not rub against the casing during operation.

3. Before running the deep well pump, clean water should be passed into the shaft and bearing housing for pre-lubrication.

4. Before starting the deep well pump, the inspection items shall meet the following requirements:

1) The base foundation bolts have been tightened;

2) The axial clearance meets the requirements, and the safety nut of the adjustment bolt has been installed;

3) The packing gland has been tightened and lubricated;

4) The motor bearings have been lubricated;

5) Rotating the motor rotor and check mechanism by hand are both flexible and effective.

5. The deep well pump must not run dry without water. The primary and secondary impellers of the pump should be submerged below 1m. During operation, the water level in the well should be observed frequently.

6. In operation, when there is a large vibration around the foundation, the bearing of the pump or the packing of the motor should be checked for wear; when the wear is too high and the water leaks, it should be replaced with a new one.

7. The deep well pump containing mud and sand has been sucked and discharged. Before stopping the pump, it should be rinsed with clean water.

8. Before stopping the pump, close the water outlet valve, cut off the power, and lock the switch box. When stopped in winter, drain water from the pump.

Deep well pump applications

Deep well pump is a water-lifting device that works by directly connecting the motor and the pump to submerge into the water. It can be used for water supply and drainage in cities, factories, railways, mines, and construction sites. Since the deep well pump is directly submerged into the water by the motor and the pump body, its safety and reliability will directly affect the use and efficiency of the deep well pump. Therefore, the deep well pump with high safety and reliability has also become the first choice.

In a groundwater source heat pump air-conditioning system, a deep well pump can often supply enough water for two or more heat pump units. However, in actual operation, it was found that the heat pump unit was running at part load most of the time, and the deep well pump was always running at full load, resulting in a large increase in electricity and water charges.

Frequency conversion speed regulation technology is widely used in air-conditioning systems for pumps and fans due to its significant energy-saving effects and reliable control methods, and its technology is relatively mature. However, the application of deep well pumps in ground-water source heat pump air-conditioning systems is rare , But it is quite necessary. A pilot survey of groundwater source heat pump applications in Shenyang found that in a groundwater source heat pump air conditioning system, when the heat pump capacity is not large, the water supply of a deep well pump can meet the water demand of two or more heat pump units. In actual operation, it was found that the heat pump unit runs part-load most of the time, and the deep well pump has been running at full load, resulting in a large increase in electricity and water charges. Therefore, the application of deep well pump variable frequency speed regulation water supply technology in groundwater source heat pump system has great energy saving potential.

Deep well pump adopts temperature difference control method. Since the heat pump unit must ensure that the water temperature of the evaporator cannot be too low under heating conditions, a temperature sensor is set on the return pipe of the deep well pump, and the set temperature is tjh. When the return water temperature on the well source side is greater than the tjh value, the deep well pump controller sends a frequency signal to reduce the current to the inverter. The power is also reduced accordingly, thereby achieving the purpose of energy saving. When the temperature of the return water on the water source side is lower than the tjh value, increase the frequency. ^[2]