QS Small Submersible Pump

Brief introduction

QS submersible electric pumps are widely used in agricultural irrigation, shallow well pumping, fountain engineering, industrial and civil building water supply and drainage systems, as well as water diversion in hilly and mountainous areas, and drainage in low-lying areas.

Its characteristics are: integrated pump and machine, simple structure, easy installation, disassembly, use and maintenance, safe and reliable operation, high efficiency and power saving.

At present, our factory can provide users with more than 80 models of QS submersible electric pumps, including a head of 5-130 meters, a flow rate of 10-500 m ³/h, and a motor power of 3-11 kW.

Structural Features

The QS submersible electric pump consists of two main parts: a submersible motor and a water pump. The submersible motor is assembled from four components: stator, rotor, and upper and lower bearing seats. The stator winding is made of polyethylene insulated nylon sheathed water-resistant electromagnetic wire. The upper and lower bearings each have a bearing chamber, and the rolling bearings are sealed with six rotating shaft lips to form a sealing ring. The bearing chamber is filled with an appropriate amount of water-resistant grease to lubricate the rolling bearings. Fill the submersible motor chamber with clean water before use.

The water pump consists of an impeller, a guide vane body, and an inlet joint, and is installed on the upper part of the submersible motor. The impeller is fixed on the extended shaft of the submersible motor with a cone sleeve or key. The impeller rotates with the motor shaft, doing work on the water and causing it to flow out through the guide vane body and outlet pipe.

3、 Model meaning

4、 Structural schematic diagram

5、 Pump selection knowledge

Users need to choose a suitable electric pump based on the diameter of their own well (which can be ignored if not used in the well), water inflow, and dynamic water level.

1. Well diameter (not used in the well, this table can be ignored)

Select the radial size of the electric pump according to this table:

2. Water inflow

The water inflow of wells varies depending on the region. You can visit experienced local people or consult with local hydrological stations. The flow rate of the electric pump you choose should be much smaller than the inflow of the local well to prevent the well from collapsing.

3. Dynamic water level

When the machine is turned on to pump water, the water level of the well continuously drops. After a period of time, the water level of the well no longer drops. At this time, the water level of the well is called the dynamic water level. At this point, the actual head of your well is the vertical distance from the water surface of the dynamic water level to the outlet on the ground.

Knowing the actual head of the well, the head of the electric pump can be calculated using the following formula:

Electric pump head=actual head of water well+loss inside the pipe (usually 2-3 meters loss per 100 meters)

If the head of the electric pump you choose is similar to the head you calculated, then the electric pump has high efficiency, saves electricity and money, and has a long service life. If the head of the electric pump you choose is much lower than the calculated head, it will cause a decrease in flow rate, low efficiency of the electric pump, high electricity consumption, increased axial force, premature damage to the bearings below, and if not careful, it will cause damage to the entire electric pump. If the head of the electric pump you choose is much higher than the head you calculated, the efficiency of the electric pump will be low, electricity costs will increase, the flow rate of the electric pump will increase, overloading will cause temperature rise, and the electromagnetic wire will age prematurely and burn out the motor. Here, we need to correct the next misconception. Some users specifically choose high lift pumps to prevent the water level from dropping, thinking that lowering the electric pump deeper will solve the problem. Wrong! The actual head of your well is the vertical distance from the dynamic water level to the outlet on the ground, not the vertical distance from the electric pump to the outlet on the ground. No matter how deep the electric pump goes into the well, it does not change the actual head of the well. High head electric pumps are still used in low head wells.