Principles and steps for the basic selection of Guangzhou Guangyi Pump
The first section of the Guangyi pump selection principle
The pump is a general-purpose mechanical equipment with a wide range of applications. It is widely used in petroleum, chemical, electric metallurgy, mining, ship selection, light industry, agriculture, civil and defense sectors, and plays an important role in the national economy. According to statistics in 79 years, China's pump output reached 1.256 million units. The power consumption of the pump accounts for more than 21% of the national electricity consumption. Therefore, it is of great significance to reduce the energy consumption of the pump and to save energy.
In recent years, our pump industry has designed and developed many energy-efficient products, such as IHF, CQB, FSB, UHB and other pump products, which have played a positive role in reducing pump energy consumption. However, in various fields of the national economy, many pumps are in an unreasonable operating condition due to unreasonable selection, low operating efficiency, and a large amount of energy is wasted. Other pumps are not suitable for use because of the unreasonable selection, or the maintenance cost is increased, and the economic benefit is low. It can be seen that the rational selection of pumps is also of great significance for energy conservation.
The so-called rational selection of pumps is to comprehensively consider the comprehensive technical and economic indicators such as the investment and operating costs of pump units and pumping stations, so that they meet the principles of economy, safety and application. Specifically, there are the following aspects:
1 The flow rate and head requirements must be met, that is, the operating point of the pump (the intersection of the characteristic curve of the device and the performance curve of the pump) is required to be kept in an efficient range, which saves power and is not easy to damage the machine.
2 The selected pump has to be small in size, light in weight, cheap in cost, and has good characteristics and high efficiency.
3 It has good anti-cavitation performance, which can reduce the excavation depth of the pump house without causing cavitation of the pump, stable operation and long service life.
4 According to the selected pump construction pump station, the project investment is small, and the running cost is low.
Section 2 Selection Procedures for Guangyi Pump Factory
First, list the basic data:
1. Characteristics of the medium: medium name, specific gravity, viscosity, corrosivity, toxicity, etc.
2. The particle diameter and content of the body contained in the medium.
3. Medium temperature: (°C)
4, the required traffic
General industrial pumps can ignore the amount of leakage in the piping system during the process, but must consider the impact of the process on the flow. Agricultural pumps that use open channels should also consider leakage and evaporation.
5. Pressure: suction tank pressure, drain pressure, pressure drop in the piping system (head loss).
6. Pipeline system data (pipe diameter, length, type and number of pipe attachments, geometric elevation of sink to pressure tank, etc.).
The device characteristic curve should also be made if necessary.
When designing the layout of the pipeline, you should pay attention to the following items:
A. Reasonably choose the diameter of the pipe, the diameter of the pipe is large, the flow velocity is small, the resistance loss is small, but the price is high, and the pipe diameter is small, which will lead to a sharp increase in the resistance loss and increase the lift of the selected pump. With increased power, both cost and operating costs increase. Therefore, it should be considered from a technical and economic perspective.
B. The discharge pipe and its pipe joints should take into account the maximum pressure that can be withstood.
C. The pipe arrangement should be arranged as a straight pipe as much as possible. Minimize the accessories in the pipe and minimize the length of the pipe. When turning, the bending radius of the elbow should be 3 to 5 times the diameter of the pipe, and the angle should be as large as 90. °C.
D. The discharge side of the pump must be equipped with a valve (ball valve or shut-off valve, etc.) and a check valve. The valve is used to adjust the operating point of the pump. The check valve prevents the pump from reversing when the liquid is reversed, and prevents the pump from hitting the water hammer. (When the liquid flows backwards, it will generate a huge reverse pressure, which will damage the pump)
Second, determine the flow, head
Determination of traffic
· a. If the minimum, normal, and maximum flow rates have been given in the production process, the maximum flow rate should be considered.
· b. If only normal flow is given in the production process, consider leaving a certain margin.
For the large flow rate of ns>100, it does not care about the lift pump, the flow margin is 5%, for ns
· c. If the basic data is only for weight flow, it should be converted into volume flow.
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