How to choose the water pump?

The selection of water pump mainly involves data such as working fluid, working fluid characteristics, lift, flow rate and ambient temperature. A suitable water pump not only has stable operation and long service life, but also can save costs for users to the maximum extent. So, how do we choose the right pump? As follows:

Selection steps of pump

Select the pump and list the basic data:

1. Medium characteristics: medium name, specific gravity, viscosity, corrosiveness, toxicity, etc.

2. Particle diameter and solid content contained in the medium.

3. Moderate temperature: (℃)

4. The required flow can generally be ignored in the process flow of industrial pumps, but the influence of process changes on the flow must be considered. If agricultural pumps use open channels to deliver water, leakage and evaporation must also be considered.

5. Pressure: suction tank pressure, discharge tank pressure and pressure drop (head loss) in the pipeline system.

6. Pipeline system data (pipe diameter, length, type and quantity of pipeline accessories, geometric elevation from suction tank to pressure tank, etc.). ).

If necessary, the device characteristic curve should also be made. When designing and arranging pipelines, attention should be paid to the following items:

1. Reasonable pipe diameter, large pipe diameter, low liquid flow rate and small resistance loss under the same flow rate, but high price and small pipe diameter will lead to a sharp increase in resistance loss, which will increase the head of the selected pump, increase the driving force and increase the cost and operating expenses. Therefore, we should consider it comprehensively from the technical and economic perspectives.

2. The maximum pressure that the discharge pipe and its pipe joint can bear should be considered.

3. The pipeline layout should be as straight as possible, and the accessories in the pipeline should be reduced as much as possible, and the length of the pipeline should be shortened as much as possible. When turning is necessary, the bending radius of the elbow should be 3 ~ 5 times of the pipe diameter, and the angle should be greater than 90℃ as far as possible.

4. The discharge side of the pump must be equipped with valves (ball valves or globe valves, etc.). ) and check valve. The valve is used to adjust the working point of the pump, and the check valve can prevent the pump from reversing when the liquid flows backwards and prevent the pump from being impacted by water hammer. When the liquid flows backwards, it will produce huge reverse pressure and damage the pump. )

Determine the pump selection, lift and flow;

1. If the minimum, normal and maximum flow rates have been given in the production process, the maximum flow rate should be considered.

2. If only the normal flow is given in the production process, a certain margin should be considered. For ns> 100 high-flow low-lift pump, the flow margin is 5%, which is NS.

3. If the basic data only gives weight flow, it should be converted into volume flow.

Water pump is a kind of general-purpose mechanical equipment, which is widely used in petroleum, chemical industry, power metallurgy, mining, shipbuilding, light industry, agriculture, civil use and national defense, and occupies an important position in the national economy. According to statistics, the output of water pumps in China has reached 5.256 million units. The electric energy consumption of pumps accounts for more than 2 1% of the national electric energy consumption. Therefore, it is of great significance to reduce the energy consumption of water pumps.

Zhongke Yujie water pump power-saving system has many advantages, such as multifunction, low noise, convenient operation and use, energy saving and so on. , welcomed by the majority of users. Adopt microcomputer intelligent control and built-in special PID regulator. When the running frequency of the water pump rises by 50Hz, the pressure is still lower than the set value. At this point, the system automatically switches the pump to the mains supply until the pressure reaches the set value. When the water consumption is low, the system controls the water pump to track the pressure and automatically decelerate. When the operating frequency is as low as the set value, the pump will automatically stop running, and the other pump will switch to power-saving operation, so that the water pressure will always be kept at the set value, thus achieving the goal of constant water pressure and saving a lot of electricity expenses.