Selection and calculation of air filter Foreword: Air filter is an important component of compressor unit. Its selection directly affects the life and performance of the unit. This chapter briefly expounds some basic structures and selection methods of air filter, hoping to be helpful to everyone. one picture Overview of air filter industry for compressor picture The head of oil-injection twin-screw compressor belongs to precision equipment, and the screw clearance is measured in um. The size of the gap directly affects the key indexes such as efficiency, reliability, noise and vibration of the head, so the cleanliness of the intake air has a very important influence on the performance and life of the head when the compressor is used. Therefore, the selection of air filter and oil filter is very important for oil-injected twin-screw compressor. This topic focuses on the air filtration structure, selection calculation and matters needing attention in use of twin-screw compressor. two picture Brief introduction of air filtration picture For air filtration, the application range is very wide, such as automobile engine intake filtration, compressor air filtration and so on. As long as there are requirements for the precision of suction filtration, air filtration is indispensable. The scope of application of air filtration can generally be divided into the following industries: 1) Construction machinery 2) Agricultural machinery 3) Compressor 4) Engine and gearbox 5) Commercial and special vehicles 6) Others Here, the compressor is classified as an industry, which shows that the compressor’s usage and requirements for air filtration have formed the default industry requirements. Take Manhummel, the earliest manufacturer of air filters that entered the China market, for example, the air filters that entered the compressor market were subdivided into industrial markets from construction machinery. After years of use and improvement, the compressor market has put forward industry requirements for high precision filtration, high ash content and low pressure loss of air filtration. Various air filtration manufacturers have also been committed to these aspects of research, and the quality of air filtration has gradually developed to high filtration accuracy, long life and low pressure loss, while the cost performance is also improving step by step. three picture Selection calculation of air filter picture For designers, the selection and calculation of air filter is very important when designing compressor. The following is explained in several steps. 1) Selection of air filter style According to the different requirements of various equipment for air quality, various manufacturers also make different series of distinctions on air filtration. Generally, different series of products are designed according to the different requirements of intake capacity and filtration accuracy. The following is the preliminary classification of Manhummel products.
Selection is to preliminarily determine which series of air filters to select according to the rated air volume of the compressor, and then select a corresponding series of products according to the actual requirements (such as pressure loss, service life, filtering requirements, shell materials, etc.). Europiclon series are mostly used in general compressor industry, and when the gas volume is large, multiple parallel connections are adopted to solve it.The main structure of air filter includes: A air filter shell B main filter element C safety filter element D dust outlet E main filter element skeleton, etc., and the functions of each part are as follows: Empty filter shell: pre-filtration. The gas to be filtered enters tangentially from the air inlet of the shell, and the large particle dust is pre-separated by rotating classification, and the separated large particle dust is discharged from the dust outlet. Among them, 80% solid particles are pre-filtered by empty filter shell. In addition, the combination of air filter shell and air filter element can play a role in silencing the air inlet of the air compressor. Main filter element: the core component of air filtration, which determines the filtration accuracy and service life of air filtration. The material is made of special filter paper, and the special fiber structure of filter paper can effectively block solid impurities with a considerable diameter. Among them, 20% (mainly fine impurities) are filtered by the main filter element. The following scale diagram can clearly see the filtering ratio of dust between the empty filter shell and the main filter element.
Safety core: As its name implies, safety core is a filter element that plays a short-term safety role. Mainly in some working conditions, it is necessary to replace the main filter element when the compressor is running, so as to prevent other sundries (such as plastic bags) from being sucked into the head when the main filter element is replaced during operation, resulting in the head failure. The safety core is mainly composed of synthetic fibers, which cannot be used as the main filter core. Generally, industrial air compressors are not equipped with safety cores, which are often used when moving compressors or when air filters cannot be stopped for replacement. Ash discharge port: mainly used for centralized discharge of dust separated from the primary filter shell. The main point of attention is that the ash outlet should be downward at the bottom when the air filter is arranged and installed, so as to ensure that the pre-separated dust can be gathered at the ash outlet and discharged centrally. Others: air filter has other accessories such as air filter bracket, rain cap, suction pipe joint, pressure difference indicator, etc. 3) Example of air filter selection (according to Manhummel sample selection) According to the designed air compressor with rated flow of 20m³/min, the air filter differential pressure alarm differential pressure is 65mbar. Please select the air filter. And calculate the use time. The selection process is as follows: A. select Europiclon series according to Manhummel air filtration series (as shown in the following table).
B. Find the list of Europiclon series products, and first select the response air filter according to the gas consumption requirements (in this case, 20m³/min gas consumption is required, first select the red box model in the following table according to the recommended gas consumption, and then verify whether the service time meets the customer’s requirements).
B. Find the list of Europiclon series products, and first select the response air filter according to the gas consumption requirements (in this case, 20m³/min gas consumption is required, first select the red box model in the following table according to the recommended gas consumption, and then verify whether the service time meets the customer’s requirements).