Technical requirements for diesel engine water pump

Article provenance：Hai Rui ZhonglianPopularity：Publication time：2020-03-24 09:35

Technical requirements for diesel engine water pump

The so-called lift refers to the required lift, rather than lifting height, which is particularly important for the selection of pumps. The lift of diesel engine water pump is about 1.15-1.20 times of lifting height. If the vertical height of water source and water is 20 meters, the required lifting height is about 23-24 meters.

When selecting water pump, the head on the water pump nameplate should be close to the required head, and the general deviation should not exceed 20%. In this case, the efficiency of the pump is the highest, it is also more energy-saving, and it will be more economical to use. If the head on the nameplate is far less than the required head, the water pump is often unable to meet the needs of users. Even if it can be pumped, the amount of water is very low. However, in turn, when a higher head pump is used for a lower head, excessive flow will occur, resulting in motor overload. If the motor temperature rises, the winding insulation will gradually age, and even burn the motor.

Introduce the requirements of horizontal water pump according to the service conditions

Characteristics of horizontal water pump

The pumps produced by our factory are suitable for pumping and silting sewage and sludge in various harsh environments. The water pump is the down suction type, which can discharge the surface water of the working face. The motor is a three-phase synchronous motor, filled with water and asynchronous diving. It can work in diving for a long time and also can be exposed to the working surface. The utility model has the advantages of small floor area, convenient installation and use, reliability and durability, and long service life. Next, I will introduce the working conditions of horizontal pump.

Service conditions of horizontal water pump

The horizontal water pump is a kind of water lifting machine which is directly connected with the motor and the water pump. It is mainly applicable to farmland irrigation, urban, industrial and mining enterprises water supply, drainage and other projects.

Horizontal pumps for power demand:

1. The rated frequency is 50Hz, and the rated voltage at the motor end shall be 380 plus or minus 5% of the three-phase AC power supply (if the user's voltage is 660V, special order is required)

2. The load power of transformer shall not exceed 75% of its capacity.

3. When the transformer is far away from the well, the voltage drop of the transmission line shall be considered. For motors with power greater than 45KW, the distance from the transformer to the wellhead shall not exceed 20 meters. When the distance is more than 20 meters, the specification of transmission line shall be greater than that of distribution cable. Level and consider line pressure drop.

Water quality requirements for horizontal pumps:

1. General non corrosive water

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

3. The pH value of pH is in the range of 6.5-8.5.

4. The chloride ion content in the water is not more than 400mg / L.

5. The content of hydrogen sulfide shall not exceed 1.5ml/l

6. The water temperature shall not be higher than 20 ° C.

Summary of operation environment and working condition of horizontal pump:

1. Three phase AC power supply with power frequency of 50Hz and rated voltage of 380V or 660V (charge tolerance of plus or minus 5%).

2. The volume ratio of solid matter in the transmission medium is less than 2%, and the density of the transmission medium is as high as 1.2 × 10.

3. The temperature of the conveying medium shall not exceed 40 ℃.

4. The pH value of the conveying medium is 4-10.

5. The sewage submersible pump unit without equipment starts from the cooling state of the motor, allowing the motor of the electric pump to reach the water surface in a short time and no more than 0.5 hours.

6. According to the impeller center, the submergence depth shall not exceed 20 meters.

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