What is the relationship between the lift and the series of multi-stage pumps?

Category: Water pump knowledge

2024-04-18

Multistage pump head and series have a close relationship. A multistage pump is a device that delivers fluid in stages by connecting multiple pump stages together. The number of stages of the pump refers to the number of pump stages in series inside the pump body, and the lift is the height of the liquid that the pump can provide. In a multi-stage pump, each pump stage can provide a certain lift, so the more stages, the higher the total lift.

多级泵的扬程和级数有什么关系？

In a multistage pump, each pump stage consists of a rotor and a stator. When the pump is started, the liquid passes through the first pump stage, increases the pressure by the centrifugal force of the rotor blades, and then enters the next pump stage. This process is repeated for each pump stage, gradually increasing the pressure and head of the liquid. Therefore, the more stages, the more stages the liquid passes through in the pump, and the higher the head.

The relationship between the number of stages and the head of the multistage pump is linearly and positively correlated. That is, adding a pump stage, the head will increase by a fixed amount. This is because each pump stage can provide a certain lift, the increase in the number of stages in the multi-stage pump is equivalent to increasing the number of pump stages with lift capacity, so the total lift will increase accordingly.

what is the pump head and series:

Head refers to the height at which the pump can lift water. Generally, "H" is used instead, and the unit is m. The head of the pump is generally composed of the suction head and the pressure head. The number of stages indicates the number of impellers and the multiple of the head. An impeller is called a single-stage pump, and the number of stages is 1 (generally not marked). More than 2 stages are called multi-stage pumps. The stages of multi-stage pumps should be marked. For example, 3 stages indicate that there are 3 impellers.

The relationship between lift and series has the following points:

1. The pump head is proportional to the series, and the total head is increased by increasing the impeller to increase the series of the pump.

2. The relationship between head and power is not big. It is related to impeller diameter and impeller series. The larger the series, the higher the water.

3. The total lift of the stainless steel multi-stage pump is equal to the single-stage lift multiplied by the series.

Other factors that determine the size of the head:

1. Relationship with the number of blades

When the other is a fixed value, there is no flow loss. For an impeller with the same impeller diameter, the head will increase as the number of blades increases.

2. Relationship with blade outlet placement angle β2A

If it is a fixed value, the blade outlet angle is large, the theoretical head of the flow increase will also increase, and the blade outlet placement angle is small, the theoretical head of the flow increase will also decrease.

3. Relationship with speed

According to the Euler equation, the higher the speed, the greater the theoretical head.

It should be noted that although the increase in the number of stages can increase the head, but the efficiency of each pump stage will be reduced. Therefore, in practical applications, it is necessary to make a trade-off between head requirements and energy efficiency, and select the most suitable series. If there are too many stages, it will not only increase energy consumption, but may also cause overload operation of the pump. Therefore, the reasonable selection of the number of stages is the key to ensure the normal operation of the multi-stage pump.

In summary, there is a close relationship between the number of stages and the head of the multi-stage pump. Increasing the number of stages can increase the head, but it will also reduce the efficiency of the pump. When choosing a multi-stage pump, it is necessary to weigh the actual needs to ensure that the pump can work normally and efficiently.

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