First, confirm the type of booster pump according to the booster medium. For example, if the booster medium is air/nitrogen, we will be elected in the air booster pump/nitrogen booster. If the booster medium is gas, we will be elected in the gas booster; if the booster medium is liquid, we will be elected in the pneumatic liquid booster pump.
Secondly, the type of pump is confirmed preliminarily according to the pressure required by the system. Normally, the driving pressure of SC pneumatic booster pump is less than 7 bar. So, the boost ratio is Ratio = Po / Pa. Among them, Po is the output pressure of the system; Pa is the driving pressure of the pneumatic pump, with a maximum value of 0.7 MPa. According to the calculated boost ratio, the type of pump is selected in the corresponding type of pump gauge. Note that we usually choose pumps with a boost ratio slightly higher than the calculated value to ensure that our pumps can output the pressure required by the system under normal conditions.
Thirdly, the flow rate of the pump can meet the system requirements. When we choose the pump model according to the outlet pressure of the pump, we need to calculate whether the flow rate of the pump can meet the requirements. 泵的流量计算办法是这样的：每冲程的排量×每分钟的动作频率（普通以40计）。 For example, 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 traffic with the traffic required by the system to see if the request can be met.
If the flow rate is not enough, then we choose a pump with similar boost ratio and larger flow rate, and calculate the flow rate until the system flow request is satisfied. Note that what we mean by flow is the flow at atmospheric pressure. We will measure the volume of the medium (liquid or gas) which is pressurized by the pump within one minute under atmospheric pressure. So, with regard to gases, we need to think about the magnitude of the pre-boost pressure. For example, we use air supercharger AB-2 to pressurize 7 bar of air to 1.2 MPa, and its flow rate Q = 7 *q *n = 7 *47.6 ml *40 = 13328 ml/min = 13.328 L/min.
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