First, confirm the type of booster pump according to the booster medium.
For example, if the booster medium is air/nitrogen, we will choose it in the air booster pump/nitrogen booster. If the booster medium is gas, we will choose it in the gas booster; if the booster medium is liquid, we will choose it in the pneumatic liquid booster pump.
Secondly, the type of pump is confirmed preliminarily according to the pressure required by the system.
Generally speaking, the driving pressure of the pneumatic booster pump of the manufacturer is less than 8 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 meter.
Note that we usually choose pumps with a boost ratio slightly higher than the calculated value to ensure that our pumps can normally output the pressure required by the system.
Third, whether the flow of the pump can meet the system's request.
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 request. The flow calculation method of the pump is as follows: the displacement per stroke * the action frequency per minute (usually 40).
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 system demand traffic to see if it can satisfy the request.
Assuming that the flow rate is insufficient, then we choose a pump with similar boost ratio and larger flow rate, and calculate the flow rate until the system flow plea is satisfied.
Note that what we mean by flow rate is the flow rate 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, if we use an air booster pump to pressurize 7 bars of air to 1.2 MPa, its flow rate Q= 7*q*n=7*47.6 ml*40=13328 ml/min=13.328 L/min.
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