Pump flow several common adjustment methods

Flow is one of the important parameters of the pump, is crucial for water pump, the pump in use, sometimes need to adjust the pump flow, the correct flow regulation method can contribute to the overall operation of the pump, the pump flow regulation method is what?

1, variable speed adjustment

change the pump rotation speed, can make some changes to the water pump performance, to make the change of pump point, this method is called variable mediation.

2, variable diameter adjustment

after turning impeller, pump performance will change according to certain rules, so that the pump point change. We change the cutting impeller pump working point method, called a variable diameter.

3, variable Angle adjustment

change the blade installation Angle change can make the performance of the pump, so as to achieve the aim of changing the point for the pump working condition. The way the change point is called the pump variable Angle adjustment.

4, throttling

for water pipeline installation of gate valve of the pump device, the gate valve off hours, increased the local resistance in the pipeline, the pipeline characteristic curve steepening, the point Q - along the water pump H curve move above to the left. The smaller the gate locked, resistance increases, the greater the flow becomes smaller. This pass the small gate valve to change the pump point method, called the throttling adjustment or valve adjustment.

down gate valves, piping local head loss increase, piping system characteristic curve and move to the left above pump working point are also moving to the left. The smaller the gate locked, the local head loss, the greater the flow will be small. Thus throttling not only increase the local head loss, and reduced the water yield, is not the economy. But because of its simple, applied in the small pump device and the water pump performance test.

5, the valve regulating

is by far the most common and most popular method of use. Install regulator in the file removal pipe pump on the road, to realize the flow control by change of valve opening, the method is simple and reliable, but the power loss is bigger, economy is bad, bad for small flow or small flow adjustment effect.

6, variable speed adjustment

to regulate traffic by changing the speed of the water pump impeller, additional power loss is small, this method is the most economical way. But need to increase the shift gear and variable speed motor, initial investment cost is emperor youzhu of northern qi pressure frequency conversion water supply system and central air conditioning cooling water ( Frozen water) Circulatory system is for the application of frequency control of motor speed centrifugal pump in water regulation of the two typical examples. Change method most suitable for steam turbine, the internal combustion engine and the rotational speed of dc motor driven centrifugal pump, the inverter control can be used to change the motor speed, sometimes also can by using hydraulic coupler to adjust speed.

7, by-pass adjustment

use the bypass shunt flow adjusting, can solve the problem of centrifugal water pump in the small flow continuous operation, but not make full use of the additional losses increase, shunt flow process pipeline at the same time also will increase.

8, cutting impeller diameter, through the method of cutting impeller diameter regulating the flow of a centrifugal pump, the power loss is small, but can't recover after impeller cutting which can only adjust the flow in the direction of small flow rate. And impeller cutting quantity is limited, flow control co. , LTD. Suitable for long-term work under small flow rate and flow change is not big. For example: Ⅰ S150 - 125 - 315 a single-stage single-suction centrifugal pump and IS150 - 125 - 315 b centrifugal pump two types of centrifugal pump is through IS150 - 125 - Centrifugal pump impeller cutting diameter of 315 models.

9, replacement impeller diameter changes of the impeller can regulate the flow of the pump power loss is small, but need to prepare all kinds of the diameter of the impeller, regulate the flow of limited

10 and closed for a couple of impeller passage

closed a couple of impeller passage ( An even number) To reduce the flow of water pump equivalent throttling adjustment, but better than the regulator throttling energy-saving

11, adjust the blade outlet Angle

by changing the impeller blade outlet Angle to achieve in a centrifugal pump flow regulation of this kind of method for axial flow pump.

12, cavitation adjustment

by changing the centrifugal pump inlet pressure ( Water level, the suction valve) The method of cavitation in the centrifugal pump, change the water pump characteristic curve, and then the method to change the flow of water pump. Practice proves that the cavitation adjust if you use the appropriate, the damage to centrifugal pump flow components are not serious; But on the other hand, can automatically adjust the flow rate, reduce the pump power consumption. Cavitation regulating mode in small and medium-sized more commonly used on the condensate pump of coal-fired power plants. 13, increase or decrease the pump sets

by increasing, reducing the operation of the centrifugal pump sets with the merger of the right way to implement the regulation of centrifugal pump flow

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