Sinyane pump teaches you to choose the appropriate model parameters of submersible axial flow pump

Section I standards for model selection of submersible axial flow pump
Submersible axial flow pump is a kind of universal industrial equipment with many aspects. It is widely used in crude oil, chemical plants, electric power engineering, metallurgical industry, mining, ship selection, light industry, agriculture and animal husbandry, civil and national defense security units, and occupies a key influence in social economy. According to statistical analysis, the production of water pump industry in China has reached 125 60000 units. The electromagnetic energy consumption of submersible axial flow pump accounts for more than 21% of the national electromagnetic energy consumption. Therefore, it is of great practical significance to reduce the energy consumption of the pump.
In recent years, many high-efficiency, energy-saving and environmental protection products have been developed for the design scheme of submersible axial flow pump manufacturing industry, such as QZB pump, QHB pump, zlb pump, ZXB pump, GLB pump and other submersible axial flow pump model series products, which has played a positive and active role in reducing pump energy consumption. However, at this stage, in all walks of life of social economy, because the model selection of submersible axial-flow pump is unscientific, many submersible axial-flow pumps are in unscientific operation, with low operation efficiency, luxury and waste of a lot of electric energy. Some pumps can not be applied at all because the model selection is unscientific, or the application maintenance cost increases and the economic benefit is low. It is not difficult to see that effective pump selection has the same key practical significance as saving resources.
To put it bluntly, the effective selection of submersible axial flow pump model is to comprehensively consider the comprehensive technical and economic data such as the project investment and operation cost of pump generator set and sewage treatment plant, so as to make it meet the standards of economic development, safety and availability. On the whole, there are many levels as follows:
Be sure to consider the provisions of the total flow and the head of the submersible axial flow pump, that is, the operation work point of the pump (the intersection point of the equipment characteristic curve and the pump characteristic curve) is often maintained in the high-efficiency section, which saves the driving force and is not easy to damage the parts.
The selected submersible axial flow pump has excellent characteristics and high efficiency. It has excellent anti cavitation characteristics, which can not only reduce the deep excavation of the foundation pit of the fire pump house, but also prevent the cavitation of the submersible axial flow pump, with stable operation and long service life. According to the selected submersible axial flow pump, the construction of sewage treatment plant has less investment and low operation cost.
Section II selection process of submersible axial flow pump
1、 List basic data information:
1. Characteristics of the substance: name, proportion, viscosity, corrosion, toxic and side effects, etc.
2. What is the diameter and composition of particles that often contain factors in matter.
3. Material temperature: (℃)
4. General industrial grade submersible axial flow pump can ignore the leakage in the pipeline system software in the production process, but the harm to the total flow caused by the change of processing technology must be considered. If irrigation canal is used for water supply, water leakage and annual rainfall must also be considered.
5. Working pressure: working pressure of suction reservoir, working pressure of drainage pipeline pool, gas pressure in pipeline system software (pump head damage).
6. Data information of pipeline system software (pipe diameter, length, type and quantity of pipeline notes, geometric design standard from suction reservoir to pressure reservoir, etc.).
If necessary, the equipment characteristic curve shall also be made. When designing the pipeline, pay attention to the following matters:
A. Select the pipe diameter effectively. The pipe diameter is large. Under the same total flow, the liquid flow rate is small and the friction resistance damage is small. However, the high price and small pipe diameter will greatly expand the friction resistance damage, increase the lift of the submersible axial flow pump of the selected pump, increase the wear output power, and increase the cost and operation cost. Therefore, it needs to be comprehensively considered from the perspective of technology and economic development.
B. The discharge pipe and tee joint shall take into account the large working pressure they can bear.
C. The pipeline layout shall be arranged as a connecting pipe as far as possible, reduce the notes in the pipeline and change the length of the small pipe as far as possible. When it is necessary to turn, the bending radius of the elbow shall be 3 ~ 5 times the diameter of the pipeline, and the viewing angle shall exceed 90 ℃ as far as possible.
D. The discharge side of submersible axial flow pump must be equipped with gate valve (gate valve or stop valve, etc.) and check valve. The gate valve is used to adjust the working point of the pump. The check valve can prevent the pump from overturning when the liquid flows back, and prevent the pump from being severely hit by water hammer. (when the liquid flows backwards, it will cause great working pressure in the opposite direction and destroy the pump)
2、 Specify the total flow and pump head
a. If the minimum, normal and large total flow has been obtained in the production process, it should be considered according to the large total flow.
b. If only all normal total flow is obtained in the production process, a certain capacity should be considered. For the pumps with large flow and low unintended pump head with NS > 100, the total flow capacity shall be 5%. For the pumps with small total flow and high pump head with NS < 50, the total flow capacity shall be 10%. For the pumps with 50 ≤ ns ≤ 100, the total flow capacity shall also be 5%. For the pumps with poor quality and extreme operation standards, the total flow capacity shall be 10%.
c. If the basic data information only gives the total flow of net weight, it should be calculated as the total flow of volume.