There are many classification methods for air compressors. According to the displacement, there are micro air compressors, small air compressors, medium air compressors and large air compressors. According to the working principle, they are divided into volumetric types. Air compressors and speed air compressors, such as piston air compressors, screw air compressors, vane air compressors, scroll air compressors, these are typical volumes Air compressors; centrifugal air compressors, axial air compressors, and jet air compressors are speed air compressors.
The author combines his years of experience in air compressor sales to give users some advice, hoping to help users:
First: fully consider the gas requirements: The selected air compressor must meet the requirements of the production process, specifically, the air compressor pressure, exhaust gas, exhaust gas temperature, gas quality, etc. should meet the requirements for use.
1. Select the appropriate air compressor in the exhaust
For a company or gas unit, the actual gas consumption of the gas system includes the gas consumption of the existing equipment. The amount of leakage of the pipeline and the amount of gas stored in the pipeline. Considering the leakage at the pipe joints (especially the leakage of the rectangular pipe), the transmission distance from the air compressor to the gas point, the estimation error of the gas consumption of the gas system, etc., generally, the selection is empty. The exhaust of the press should match the amount of gas required by the press and reserve 10% of the space.
2. Select the air compressor with suitable air pressure.
In general, choose the air compressor to be larger than the actual maximum air pressure, but not small, if the user needs compression. If the air pressure is 0.85Mpa, you need to choose a 1.0Mpa air compressor, but you can't choose a 0.8Mpa air compressor and then forcibly pressurize. If the operating pressure of a certain gas point is low, you can use a pressure reducing valve. Gas supply.
3. Select the appropriate air compressor aftertreatment system according to the gas quality requirements
The compressed air produced by the common air compressor contains a certain amount of lubricating oil and contains a certain amount of water. For general gas use, compressed air can be used by connecting it to a gas facility through a gas pipeline. However, some gas applications are oil-free and water-free. In some gas applications, there are strict requirements on the temperature of the air. At this time, not only the selection of the compressor should be noted, but also the compressed air post-processing device should be added if necessary. For the specific configuration, please refer to the following figure
Second, the management of the air compressor should be simple and easy to operate
This should start from two aspects, one It is convenient and simple to operate the compressor itself, and has low requirements on the skill of the operator; secondly, the gas supply control mode of the compressor is simple and easy to manage.
Third, the safety of the operation and operation of the compressor
Air compressor is a kind of machine with pressure work, with a certain temperature rise and pressure during operation. The security of the operation is very important. The state implements a standardized two-certificate system for the production of air compressors. Only manufacturers with air compressor production licenses and pressure vessel production licenses (gas storage tanks) can produce or assemble compressor-related components. Therefore, when purchasing air compressor products, it is necessary to strictly examine the two certificates of the air compressor.
Fourth, energy saving requirements
Air compressor cost includes
(1)Air compressor purchase cost
(2) Installation cost of air compressor
(3) Operation cost of air compressor
Composition ratio of air compressors of different types is not the same. When selecting a compressor, the user should comprehensively compare the three costs of the selected compressor and select the most cost-effective compressor. Nowadays, many users have a wrong idea when purchasing air compressors. They think that air compressors are a universal product, and the price is low or even a value orientation. However, many users found that after purchasing a low-cost air compressor, they often found that the chain was dropped when used. The price of each air compressor is closely related to its own brand, technology and after-sales service. Users are advised to consider quality and after-sales service.
Fifth, convenient for daily maintenance
1, the compressor should be easy to install
From the convenience of installation, now the market There are mobile, portable and installation-free air compressors. The selected compressors are small in size and light in weight and easy to install. For gas units with narrow gas fields (for marine and vehicle use), vertical compressors should be selected; for gas-use units with long-distance changes (over 500 meters), mobile compressors should be considered.
2, the compressor is easy to maintain in the later stage, and the cost is low
When selecting the compressor, the convenience of daily maintenance of the compressor and maintenance cost should be fully considered. Try to use consumable parts (mainly oil and filter) to replace the compressor with long cycle, strong versatility and long after-sales service.
Sixth, other requirements for air compressors
Noise and vibration have a great impact on the operator’s body and mind, as well as the environment of the workshop and factory, if in the workshop Always high decibel noise, workers at the production site will have annoyance, which will definitely affect production efficiency and quality. Moreover, the National Environmental Protection Agency has a control limit on production noise, and the selected compressor noise is too large to meet environmental standards. If the compressor purchased by the user is to be placed on the production site, the compressor with low noise index and good anti-vibration performance should be selected.
label: [Air compressor selection][How to buy air compressor]
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