# 气体增压泵该如何选型？

1、 Determine the type of booster pump according to the booster medium. For example, if the supercharging medium is air / nitrogen, we choose it from the air booster pump / nitrogen supercharger. If the supercharging medium is gas, we choose it from the gas supercharger; Booster medium is liquid, we choose in pneumatic liquid booster pump.

2、 According to the pressure required by the system, the model of the pump is preliminarily determined. Generally, the driving pressure of SC pneumatic booster pump is less than or equal to 7 bar. Therefore, the pressurization ratio is PO / PA. Where Po is the output pressure of the system; PA is the driving pressure of pneumatic pump, generally 0.7MPa. According to the calculated boost ratio, select the type in the corresponding pump table. Note that we usually choose a pump with a boost ratio slightly higher than the calculated value to ensure that our pump can output the pressure required by the system under normal conditions. 3、 Check whether the pump flow meets the system requirements. When we choose the model of the pump according to the outlet pressure of the pump, we need to check whether the flow of the pump meets the requirements. The calculation method of pump flow is as follows: displacement per stroke × Action frequency per minute (generally 40). For example, for the pneumatic liquid booster pump 10-4000w003, we found in the pump table that its displacement per stroke is 42.50ml, then its flow Q = Q × n=42.50ml × 40=1700ml/min=1.7L/min。 Compare this flow with the flow required by the system to see if it meets the requirements.

If the flow rate is not enough, then we choose a pump with similar pressurization ratio and large flow rate, and calculate the flow rate until it meets the flow requirement of the system. Note that the flow we say refers to the flow under normal pressure, that is, the volume of the medium (liquid or gas) pressurized by the pump within 1 minute is measured under normal pressure. Therefore, for gas, we need to consider the size of pre pressurization pressure. For example, we use the air supercharger ab-2 to boost the air of 7bar to 1.2MPa, then its flow Q = 7 × q × n=7 × 47.6ml × 40=13328ml/min=13.328L/min。

4、 Select the material of the pump according to the booster medium. After the above three steps, we can select the basic model of the pump. However, the correct model also has to consider the requirements of booster medium on booster pump material. Generally, we can choose copper alloy; If the pressure medium has higher requirements for material, such as water, we choose stainless steel.

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