Air compressor parameters and selection

how to select the air compressor has been perplexing the buyer of the air compressor. In order to enable enterprises to buy products with good cost performance, Zhongshan Shunli summarized the selection process of the air compressor into three steps: first determine the working pressure, then determine the corresponding volume flow, and finally the power supply capacity. Below we give an example to illustrate it.

The relationship between power, working pressure and volume flow is as follows: under the condition of constant power, when the rotating speed changes, the volume flow and working pressure also change accordingly; For example, a 22KW air compressor is manufactured with a working pressure of 7bar, the rotating speed is calculated according to the technical curve of the compressor host, and the displacement is 3.8 m3/min; When the working pressure is determined to be 8bar, the speed must be reduced (otherwise the drive motor will be overloaded). At this time, the exhaust volume is 3.6 m3/min; because the speed is reduced, the exhaust gas is reduced accordingly, and so on.

The selection of power is to meet the working pressure and volume flow conditions, the power supply capacity can meet the matching drive motor power can be.

Through these three points and the previous section "How to Choose Air Compressor", I believe it will be of great help to friends who buy air compressors. Let's talk about the selection of air compressors with a set of data.

1. air compressor

1. Under normal circumstances, the gas consumption and working pressure of the equipment can be given when purchasing gas equipment,

according to the given value, the standard parameters of the upper air compressor can be known.

For example, the air consumption of a certain equipment is 0.83 m3/min, and the working pressure is 0.4-0.6 Mpa.

Selection: WW-0.9/7-C

parameters: exhaust volume: 0.9 m3/min, exhaust pressure: 0.7Mpa

2. In the absence of data reference, the air consumption and working pressure can only be calculated according to previous experience or by engineers.

Generally, the calculation results should be added with 30% margin before approaching the standard parameters.

For example, the calculated gas consumption of a certain equipment is 0.4 m3/min and the working pressure is 0.6-0.8Mpa.

Type selection: consider margin air consumption = 0.4 ×(1+30%)= 0.52 m3/min

by standard model: WW-0.6/10

parameters: exhaust volume: 0.6 m3/min, exhaust pressure: 1.0Mpa

attachment: Booster (oxygen, nitrogen)

when selecting a booster, you must first determine:

1, compressed medium; 2, intake pressure; 3, exhaust pressure; 4, exhaust volume; 5, when necessary, the total flow of air source should also be given.

Example 1: Compressed medium: oxygen (O2), inlet pressure: 0.2Mpa, exhaust pressure: 1.0 Mpa,

exhaust volume: 20 m 3/h(20 m 3/h oxygen generator), no oil lubrication.

Select model: VWY-20/2-10

parameters: inlet pressure: 0.2Mpa, exhaust pressure: 1.0Mpa, exhaust volume: 20m 3/h

example 2: Compressed medium: nitrogen (N2), inlet pressure: 0.6Mpa, exhaust pressure: 2.5 Mpa, exhaust volume: 60 m 3/h, no oil lubrication.

Select model: VWN-60/6-25

parameters: inlet pressure: 0.6Mpa, exhaust pressure: 2.5Mpa, exhaust volume: 60m 3/h