S type corrosion resistant pump in the open (single stage double suction centrifugal pump) overview: S type pump is a single-stage, double suction centrifugal pump water level, to adapt to the industrial and city water supply and drainage pump, the pump can be used as a factory, city, power plant, water conservancy and other drainage or water supply, can also be used for farmland irrigation. “ SF” type pump is a high efficiency and energy saving product with simple structure and excellent performance. It is used to transport clear water or other liquids with physical and chemical properties similar to water. The temperature of the transported medium is 0 to 80 degrees, and the inlet pressure is 0.6MPa..
Selection principle of medium open pump
The middle opening pump is a universal mechanical equipment with wide range. It is widely used in petroleum, chemical industry, power metallurgy, mining, ship selection, light industry, agriculture, civil and defense departments, and plays an important role in the national economy. The so-called reasonable selection of intermediate pumps is to comprehensively consider the comprehensive technical and economic indicators such as the investment and operation cost of pump units and pumping stations, so as to make them conform to the principles of economy, safety and application. Specifically, there are the following aspects:
1, we must meet the requirements of traffic and lift. That is to say, the operation point of pump (the intersection of device characteristic curve and the performance curve of pump) is always kept in the efficient range, so that it saves power and is not easy to damage parts.
2, the selected pump should be small in volume, light in weight, cheap in cost, and also with good characteristics and high efficiency.
3. It has good performance of anti cavitation, smooth running and long life.
4, the selected pump has less investment and low operating cost.
Selection of medium open pump
First, list the basic data of the medium open pump:
It includes the characteristics of the medium, the particle diameter, the content, the temperature of the medium, the flow pressure and the flow pressure of the pipeline system.
Two. Determine the flow head
1, the determination of the flow rate
A, if the minimum, normal and maximum flow rate has been given in the production process, the maximum flow rate should be considered.
B, if the normal flow rate is only given in the production process, some allowance should be taken into consideration.
For ns>100, the large flow rate and its low head pump, the flow allowance is 5%, the small flow rate of the ns<50 and pump and the flow allowance are 10%, 50&le, ns&le, 100, and the flow allowance is 5%. For the poor quality and bad running conditions, the flow allowance should be 10%.
C, if the basic data is only given to the weight flow, it should be converted into volume flow.
Three. Determine the material
If the medium is corrosive, it should be made of stainless steel
Operation of medium open pump
The middle opening pump fills the liquid in the pump casing before the pump starts. After starting, after starting, the impeller is driven by the shaft to rotate at high speed, and the liquid between the blades must also rotate along. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and obtains the energy, so as to get out of the outer edge of the impeller and enter the volute pump shell at high speed. In the volute, the liquid decelerates due to the gradual enlargement of the flow channel, and transforms some kinetic energy into hydrostatic energy. Finally, it enters the outlet pipe with high pressure and sends it to the needed place. When the liquid flows from the center of the impeller to the outer edge, a vacuum is formed at the center of the impeller. Because the pressure above the storage tank is greater than the pressure at the pump inlet, the liquid is continuously pressed into the impeller. It can be seen that as long as the impeller rotates continuously, the liquid will be constantly inhaled and discharged.
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