Detailed use of filter ultra-clean workbench air shower chamber transfer window
The air filter is mainly used for air purification to remove dust particles. In addition, in some production processes, the exhaust gas contains fine pollutants (such as radioactive materials, oil mist, etc.). Although such purification is exhaust gas purification, an air filter is also required because of its high purification requirements.
The characteristic of air intake purification is that the dust concentration in the treatment air is low, the dust particles are fine, and the required purification efficiency is high. Classification and performance of air filters depending on purification efficiency.
Note: The general filter adopts the atmospheric dust counting method, and the high efficiency filter adopts the DOP method.
It can also be divided according to the specific use, characteristics and structure of the air filter, such as:
(1) Primary air filter
Uses: Primary filtration of filtration sections in fresh air handling equipment or fresh air systems.
Features: The filter material can be replaced by itself, and the initial effect of the paper frame is one-off.
(2) Folding medium efficiency air filter
Uses: Filtration of ventilation systems. General air purification in the fields of electronics, pharmaceuticals, mechanical instrumentation, metallurgy, petroleum, chemical, light industry, food, etc.
Features: high efficiency, large dust holding capacity and small footprint.
(3) Bag type medium efficiency air filter
Uses: Central air conditioning centralized ventilation system, or as a pre-filter for high-efficiency filters, it can reduce the burden of high-efficiency filters, extend their service life, and can also be used for general air purification in the industrial field.
Features: low resistance and large dust holding capacity.
(4) Activated carbon filter
Uses: Effectively remove odors, volatiles, bacteria, viruses and various airborne pollutants such as paint sprays, smoke, common pollutants in electronics factories and museums, and odors in food processing plants and hospitals.
Features: Highly developed microporous structure, high adsorption capacity, fast absorption and desorption, good purification effect. The use of activated carbon filtration must have pre-stage filtration, otherwise the efficiency of activated carbon will be reduced due to other pollutants in the air.
(5) Nylon mesh air filter
Uses: Ventilation and air conditioning systems with low air quality requirements, or places with harsh surrounding environment and high dust as primary pre-filtration.
Features: low resistance, easy to clean, easy to maintain.
(6) Sub-high efficiency air filter
Uses: All kinds of clean engineering and special-purpose central air conditioning and process air supply system for end filtration or clean room filtration.
Features: high filtration efficiency, low resistance and large dust holding capacity.
(7) High efficiency air filter
Uses: Clean air conditioning system, high cleanliness environment.
Features: high efficiency and low resistance.
(8) High-volume high-efficiency filter
Uses: air conditioning box end high performance filter.
Features: high filtration efficiency, large air volume and large dust holding capacity.
(9) Aluminum mesh plate air filter
Uses: Ventilation and air conditioning systems with low air quality requirements, or places with harsh surrounding environment, dust and grease are used as primary pre-filtration.
Features: Durable and easy to clean.
(10) High efficiency air filter air supply port
Uses: Suitable for clean rooms of various cleanliness levels and various ceiling structures in non-laminar flow.
Features: reliable performance, easy installation and disassembly, and easy maintenance.
(11) High efficiency air filter unit with fan
Uses: Suitable for hospital aseptic operating room and electronics, biology, medicine, food and other manufacturing fields.
Features: Hanging under the floor, the cleaning effect can reach 10,000 or 100,000, saving space in the machine room, suitable for local purification, especially in the environment where the food industry often needs to wash the floor.
(12) Air shower
Uses and features: The air shower is a personal purification device used by the operator when entering the clean room. It uses a high-speed clean air stream to remove dirt that enters the room. The nozzle is adjustable to effectively remove dust from the person and prevent external contamination from entering the clean area. It can also be used for blowing large cargo.
(13) Transfer window
Uses and characteristics: A device for transferring articles in the clean area to reduce the number of door opening, which minimizes the pollution of the clean room. It is mainly used for the transfer of small items between clean areas and non-clean areas between different levels of clean areas.
(14) Object transfer window
Uses: It is suitable for the object surface to be cleaned by high-speed clean air flow before the object enters the clean area, or the high cleanliness requirement between the clean area and the non-clean area.
Features: The nozzle can be adjusted to directly align the object for blowing, effectively removing object contamination and preventing external pollution from entering the clean area.
(15) Ultra-clean workbench
Uses and features: Ultra-clean workbench is a general-purpose partial purification equipment. It can effectively eliminate the harmful effects of suspended particles and process dust in the air of work area, and is widely used in medical, pharmaceutical, chemical experiments, electronics, precision instruments, food and cosmetics.
According to the material of the air filter, it can be divided into the following types:
(1) foam filter
The foam filter uses a polyethylene or polyester foam filter. The foam is pre-chemically treated to penetrate the internal pore film to provide a series of interconnected pores. When the dust-containing airflow passes, the dust adheres to the wall of the hole due to inertia, diffusion, etc., and the air is purified. The internal structure of the foam is similar to that of the loofah, and the pore size is about 200 μm to 300 μm.
The foam is in contact with organic solvents, otherwise it is easily damaged by expansion. Can resist weak acid and weak base. Gasoline, machine oil, lubricating oil, etc. have no effect on it.
(2) Fiber-filled filter
The fiber-filled filter consists of a frame and a filter material. Depending on the requirements for purification efficiency and resistance, various fibers of different thicknesses are used as fillers, such as glass fibers (about 10 μm in diameter), synthetic fibers (polystyrene), and the like. Fill density has a large impact on efficiency and drag. Filtration thickness and packing density should be determined according to specific requirements.
(3) Fiber felt filter
This filter is a non-woven fabric (felt) made of various fibers (such as polyester, vinylon, etc.) as a filter material. Usually made in bag or roll type.
The bag type fiber felt filter is made of a non-woven filter material to form a folded or V-shaped filter bag to expand the filter area and reduce the filtration wind speed. It has high purification efficiency and is often used as a medium efficiency filter. The shape of this filter is much more. The filtration air volume of each monomer is about 200m3/h, the filtration wind speed is about 20cm/s, and the weight efficiency of artificial dust is 80%.
The self-winding filter can use foam or non-woven fabric as the filter material, and each roll of filter material is about 20m long. The filter consists of upper and lower boxes, vertical frame, baffle bar, transmission mechanism and filter material roll. After the filter material is dusty, it can be automatically rolled up and updated until the entire volume of the filter material has accumulated dust. Each roll of filter material is typically used for 8 months to 1 year.
(4) Paper filter
The paper filter is a sub-efficient and high-efficiency filter. The filter paper used for filtration is: 1 plant cellulose filter paper (for sub-high efficiency filter); 2 blue asbestos fiber filter paper (used as high-efficiency filter); 3 ultra-fine glass fiber filter paper (can be used for sub-high and high efficiency filters).
Since the resistance of the filter paper is high, the filtration wind speed is low. To increase the filtration area, the filter paper can be folded and separated by a separator in a corrugated state. The partition plate can be made by high-quality kraft paper by hot rolling, and plastic or aluminum plate can also be used. The outer frame can be made of wood, plastic, aluminum, steel and other materials.
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