One, Overview of mining submersible electric pumps
QJ series mine submersible electric pumps are suitable for extracting groundwater from deep wells and mines, and can be used for gold mines, silver mines, iron mines, coal mine rescues, and construction site drainage.
Second, the characteristics of mining submersible electric pumps
1. Motor and water pump-body, submerged in water to run, no sparks, explosion-proof, safe and reliable.
2. There are no special requirements for the well pipe, as long as the water pipe can withstand the corresponding pressure.
3. Convenient and simple installation, use and maintenance, small floor space, no need to build a pump house.
4. Simple structure, saving raw materials. 5. High efficiency, energy saving, high single-stage head, large flow, high head,
Three, the use environment and conditions of mining submersible electric pumps
1. The power frequency is 50Hz, the rated voltage is 380v or 440V, 550V, 660v, 1140V or high voltage 3KV, 6KV, (tolerance -5%) three-phase AC power supply.
2. The solid content (by mass) is not more than 0.01%.
3. The acidity PH value of the pumped liquid is 6.5-8.5.
4. The temperature of the conveying medium does not exceed 20°C.
5. The inlet of the pump must be below the dynamic water level lm, but the diving depth should not exceed the static water level by 70m, and the bottom end of the electric pump should be as deep as lm from the bottom of the well.
6. The well is required to be upright and smooth, and well pipes must not be staggered.
Fourth, the structural characteristics of mining submersible pumps
1. Mining submersible electric pumps are composed of submersible three-phase asynchronous electric motors and water pump heads. The motor is directly connected to the upper pump body, and the upper end of the motor shaft is equipped with a reliable shaft sealing device, which can effectively prevent the exchange between the coolant in the motor and the pumped medium, and ensure the long-term safe and reliable operation of the water pump.
2. The submersible pump is a single-suction multi-stage vertical centrifugal pump; the submersible motor is a water-filled wet, submersible asynchronous motor for vertical wells. The motor and the water pump are directly connected through a barrel coupling and a Huajian coupling (American standard).
3. The motor winding is nylon sheathed polyethylene water-resistant electromagnetic wire. Fill the motor cavity with clean water.
4. The motor guide bearing adopts water lubrication bearing. The lower part of the motor does not have a thrust bearing that can withstand the up and down axial force of the pump. The thrust bearing of the high-lift pump adopts nickel-containing copper sector blocks, and the imported Phillips slide plate is used for grinding, which can withstand the up and down axial force of the pump. .
5. The high-lift submersible pump adds or subtracts an axial load bearing device between the pump and the motor.
Five. Precautions for the use of mining submersible electric pumps
1. The QJ series submersible motors must be filled with clean water before they can run. When they are out of service in winter, they should be drained and filled with water to prevent freezing and cracking.
2. Regularly check the insulation resistance of the unit, and it shall not be less than 0.5MΩ.
Mine submersible electric pumps are mainly used for drainage of pump rooms in coal mines, emergency drainage or re-mining drainage after coal mines are flooded. Due to its small diameter and light weight, it has an explosion-proof effect when used in such coal mines with a higher gas concentration, and has a wider range of use.
Six, the working principle of mining submersible pumps
The main working part of the mining submersible pump is an impeller with a certain number of blades on it. The impeller is fixed on the shaft and driven by the shaft to rotate. The housing of the water pump is a spiral diffusion chamber, the suction port of the water pump is connected with the suction, and the drain port is connected with the drain pipe.
Before the water pump is started, water is poured into the pump from the water injection funnel, and then the water pump is started. The impeller rotates with the shaft, and the water in the impeller is also driven to rotate by the blades. Under the action of centrifugal force, water flows from the impeller inlet to the outlet. In this process, the kinetic energy and power energy of the water are both improved. After the water discharged by the impeller passes through the spiral diffusion chamber, most of the kinetic energy is converted into pressure energy, and then sent out along the drain pipe. At this time, a vacuum is formed at the inlet of the impeller due to the discharge of water. The water in the suction well enters the impeller through the suction pipe under atmospheric pressure. The impeller rotates continuously, and the drainage is carried out without interruption.
Post time: 2021-12-08
