100QJ2-70/14 Deep Well Pump, Submersible Pump

Purpose and Features：

The QJ submersible well pump is an energy-efficient product designed in accordance with national standards. It is widely used for farmland irrigation, industrial and mining enterprises' water supply and drainage, as well as for human and livestock water use in plateau and mountainous regions.

This pump consists of a QJ submersible pump and a YQS submersible motor integrated into a single unit that operates submerged underwater. It features a simple structure, compact size, light weight, easy installation and maintenance, as well as safe, reliable, and highly energy-efficient operation.

Operating Conditions：

1. Power Supply Requirements:

(1) Rated frequency of 50 Hz. The motor terminal must be supplied with a three-phase AC power source rated at 380 ± 5% volts (special order required for 660-volt user voltage).

(2) Transformer load power shall not exceed 75% of its rated capacity.

(3) When the transformer is located far from the well, consider voltage drop in the power line. For motors exceeding 45 kW, the distance from the transformer to the wellhead must not exceed 20 meters. If greater than 20 meters, the power line specification must be two sizes larger than the rated cable specification, and account for voltage drop.

2. Water Quality Requirements:

(1) Generally non-corrosive clean water.

(2) Sand content in water shall not exceed 0.01% (by mass).

(3) pH value shall be within the range of 6.5–8.5.

(4) Chloride ion content in water shall not exceed 400 mg/L.

(5) Hydrogen sulfide content shall not exceed 1.5 mg/L.

(6) Water temperature shall not exceed 20°C.

3. Wellbore Requirements:

The wellbore must be straight and smooth, free of protrusions or misaligned casing. The internal diameter shall not be less than the corresponding motor frame size.

Model Meaning Explanation：

Structural Features：

1. The pump is centrifugal or mixed-flow type; it employs water-lubricated bearings; the connection to the motor uses a rigid coupling. The impeller rotates driven by the motor, generating centrifugal force that increases the liquid's energy. This energy, combined with the pump casing's flow-guiding effect, facilitates water lifting. A check valve assembly is installed at the pump's upper end to prevent damage to working components caused by backflow in the riser pipe when the electric pump stops. The valve features a drain hole to slowly release water from the pipeline, preventing freezing and cracking during winter. (Note: Low-head submersible pumps do not include a check valve assembly.)

2. The motor adopts a sealed, water-filled wet-type structure. The stator windings use water-resistant polyethylene-insulated, nylon-sheathed multi-layer electromagnetic wire. Both guide bearings and thrust bearings employ water-lubricated materials. The motor cavity is filled with clean water for cooling and bearing lubrication. A pressure-regulating diaphragm at the motor base compensates for pressure differentials caused by thermal expansion and contraction of the water due to motor temperature rise. A sand-proof mechanism on the motor shaft prevents silt and sand from entering the motor housing.

3. Piping System: Used to connect the electric pump for hoisting into the well and transporting water to the surface. It primarily consists of short discharge pipes, water delivery pipes, elbows, clamps, and other components. The short discharge pipe serves as the transition component connecting the water delivery pipeline to the electric pump. Elbows are installed at the wellhead to alter the water flow direction. Clamps secure the discharge pipeline during the electric pump installation process.

Operating Conditions：