The deep well bai pump is a water lifting device that is directly connected to a motor and a water pump to submerge into the water. It is suitable for extracting groundwater from deep wells. It can also be used for water lifting projects such as dao rivers, reservoirs, and canals: mainly used for farmland irrigation and plateau mountainous areas. Human and livestock water can also be used for water supply and drainage in cities, factories, railways, mines and construction sites. Since the deep well pump is operated by the motor and the water pump body directly submerged in the water, its safety and reliability will directly affect the use and working efficiency of the deep well pump. Therefore, the deep well pump with high safety and reliability has become the first choice.
In underground water source heat pump air conditioning systems, the water supply of one deep well pump can often meet the water demand of two or more heat pump units. However, in actual operation, it was found that the heat pump unit was operating at partial load most of the time, while the deep well pump was operating at full load, which resulted in a substantial increase in electricity and water costs.
In recent years, variable frequency speed regulation technology has been widely used in water pumps and fans in air conditioning systems with its significant energy-saving effects and reliable control methods, and its technology is relatively mature. However, deep well pump water supply applications in underground water source heat pump air conditioning systems, It's rare, but it's quite necessary. A pilot survey of groundwater source heat pump applications in Shenyang found that in groundwater source heat pump air conditioning systems, when the heat pump capacity is not large, the water supply of a deep well pump can meet the water requirements of two or more heat pump units. In actual operation, it is found that the heat pump unit is running at part load most of the time, while 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 potential for energy saving.
The deep well pump adopts the temperature difference control method. Since the heat pump unit must ensure that the evaporator outlet water temperature cannot be too low under heating conditions, a temperature sensor is installed on the deep well pump return water pipe, and the set temperature is tjh. When the return water temperature at the source side of the well is greater than the tjh value, the deep well pump controller sends a signal to reduce the current frequency to the frequency converter. The frequency converter will reduce the frequency of the input power supply, and the speed of the deep well pump will be reduced accordingly. The pump water supply, shaft power and motor input The power is also reduced, thus achieving the purpose of energy saving. When the return water temperature on the water source side is lower than the tjh value, increase the frequency and adjust.