Industry news

Now more and more users are paying more and more attention to the energy efficiency of air compressor, which is also one of the important performances of our domestic enterprises towards the direction of lean production.
In this situation, in order to prove their products (air compressor), some suppliers take various methods to let users know their high energy efficiency. This was a good thing. However, if the method adopted is not correct, there will be a serious deviation from the facts, which will cause trouble to users and the market. For example, at present, there is a method to verify the energy efficiency of the main engine of air compressor by air intake flow test in the market, which is one of the methods seriously deviating from the fact.
As we all know, the gas is a changeable state, and the gas is compressible. When the gas is compressed, the pressure and temperature generated by the gas will change accordingly. Therefore, to measure the volume of a gas, its state (gas temperature and pressure) must be specified. For the positive displacement compressor, the flow is expressed by the free displacement. The internationally accepted term is "fad", that is, free air delivery, which is translated into Chinese as free exhaust volume. According to ISO or Chinese national standards, to convert the exhaust flow of air compressor into the volume flow of air in the whole machine. This intake state refers to the ambient pressure, temperature and relative humidity when intake. It should be noted that the exhaust flow in the intake state cannot be equal to the intake flow.
Why can't the measurement of intake flow represent the free exhaust flow of air compressor (rated flow of positive displacement air compressor)?
There are several main reasons:
1 because when the compressor is running, the ambient air needs to enter into the cabinet of the compressor first, then into the air inlet filter, then into the air inlet valve after passing through the air inlet filter, and then into the compression chamber. For the oil injected screw compressor, it also needs to pass through the oil-gas separation barrel, cooler and gas-water separator, and finally through the outlet of the compressor to the downstream. In this process, there are often losses caused by various leaks and losses, as well as pressure changes. Therefore, the empirical study found that there is a big deviation between the intake flow of the main engine and the free exhaust flow of the whole engine, which is less than 3-5%;