How to choose a compressed air filter

Sometimes, the quality of compressed air cannot be solved by connecting a device to a compressed air supply station. In order to obtain the appropriate mechanical work efficiency and product quality of Zui, in the internal air supply system or in a separate department, the compressed air user needs to have a general understanding of the quality of the compressed gas he will obtain. ISO8573 does not answer this question, which requires the aapc compressor, compressed air and vacuum technology trade association to provide adequate advice to compressed air users.



Provide as few particles as possible on demand



The principles provided by the ISO standard are “provided on demand, with as few particles as possible”. Because in addition to the technical requirements, aapc member companies have carefully considered various issues when drafting standard documents, and even considered this issue from the perspective of user costs. Of course, investment costs are an important part: high compressed air quality means expensive purification equipment or high quality purification equipment. More important, however, is the operating cost of the equipment.



Compressed air treatment consists of several parts (filter or dry filter combiner for pre-filtration, secondary filter/concentrator and concentration processing, etc.), and product experts can help you plan a complete solution. Those who want to choose their own filters must first familiarize themselves with the filter-related functional data and set uniform initial conditions (pressure, flow, perimeter and inlet temperatures, relative humidity, etc.).



Is the oil-free compressor better?



When dealing with problems such as dew point, retention and residual oil content, people quickly discovered that "compressed air quality" is a very complicated matter. At some point, some users may prefer a simple alternative to Zui - using an oil-free compressor. The idea is that using oil-free compressors with at least residual oil content is no longer a concern, which not only simplifies the processing equipment, but also makes it possible to obtain compressed air more economically.



In fact, oil-free compressors simply do not inject oil into the compression chamber. However, the bearings and other components of the compressor need to be lubricated. This type of compressor, oil can also reach the compressed air. Inhaled air is also the same and is easily contaminated (remember, the average dust content per unit is 20 mg/m3), so purification treatment is indispensable anyway. In particular, when the oil-free compressor produces compressed air at a higher temperature than the compressed air produced by the oil-lubricated compressor, it will adhere to more moist dirt. In short, whether you choose oil-free compressors and oil-lubricated compressors, efficient purification processes are a must. When to replace the filter



When it comes to filter efficiency issues, you must pay attention to the filter replacement cycle. Many users believe that extending the filter's working life can reduce costs. On the contrary, the filter element stuck to the dirt increases the pressure of different parts of the compressor, and the energy consumption of the entire compressed air station will also increase. Therefore, unless some new solutions such as filter environment monitors with network help function are applied, you should always pay attention to filter pressure changes. When the energy cost and the filter cost add up to the small value of zui, it is time to replace these filters. In other words, if the cost of the filter material is lower than the energy cost of the old filter, it is a good time to replace the filter.



Nanjing Ruishiji International Trade Co., Ltd. working principle of compressed air filter



1. Carry compressed air containing harmful substances such as dust, oil, rust and moisture into the compressed air filter* filter unit.



2. When the compressed air passes through the *-stage tubular mesh filter core, a coalescence effect occurs. Larger particles will be adsorbed on the filter material, and the water will condense into larger water droplets. 3. When entering the separation chamber, the compressed air velocity is slowed down, causing the particles to accumulate again, and the water mist is again condensed on a honeycomb water trap.



4. Water carrying the foreign particles flows along the bottom to the drain and is discharged through an automatic or electric drain valve.



5. More than 95% of the water, oil and large particles in the compressed air have been filtered by the * filter element, and the compressed air filtered by the * level enters the second stage filter.



6. When the compressed air passes through the second-stage fiber filter made of special cotton, thousands of small vortices will be generated, and the compressed air will be accelerated dozens of times. The center of the vortex is like a tornado, forming a vacuum state. The water droplets that have not been filtered out in the *-stage filtration are vaporized, converted, and filtered again, and the particles as small as 5 μm are completely removed by the second-stage filter.



7. After two-stage filtration, it can achieve clean, dry compressed air without dust, rust, oil and water droplets, ensuring the normal operation of pneumatic equipment and prolonging the service life of pneumatic equipment.

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