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laboratory ventilation system( fume hood system@ chemical fume hood systems@chemical hoods system ----- technical data descriptions

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laboratory ventilation system( fume hood system@ chemical fume hood systems@chemical hoods system ----- technical data descriptions
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laboratory  ventilation system( fume hood system@ chemical fume hood systems@chemical hoods system ----- technical data descriptions

 

 

 

 

 

 

The basic concept of laboratory ventilation, ventilation and ventilation cabinet concept: the so-called ventilation, is to indoor air pollution directly or after purification back to the outside the fresh air in, thereby maintaining indoor air conditions, in order to maintain health standards and meet the requirements of the production process, we have former call for air exhaust, which is referred to as the air supply. The ventilation cabinet can be simply understood as a box and a fan, a gas produced by the fan and is discharged safely discharged into the atmosphere. In 2, the classification of ventilation: according to different power and ventilation system can be divided into natural ventilation and mechanical ventilation, mechanical ventilation air can be divided into general ventilation and local exhaust ventilation, general ventilation is refers to in the room the whole of a way of ventilation, local ventilation is referring to a range of wind control the formation of an more concentrated in the hazardous substances, or is one of the working personnel of the regular activities of the local ventilation, such as ventilation cabinet, universal exhaust hood, atomic absorption cover and so on. 3, laboratory ventilation: ventilation in the laboratory is to study the control laboratory of harmful substances to the indoor air environment and the destruction of the technology. Laboratory ventilation system, the basic composition of 1, ventilation and terminal equipment, including ventilation cabinet, universal exhaust hood, atomic absorption cover blow and suction exhaust hood and so on. 2, ventilation pipe system: main blower, air duct, air valve, muffler, exhaust gas treatment tower. Brief introduction of ventilation equipment three, 1 Main dimensions, laboratory ventilation cabinet width of 1200mm, 1500mm, 1800mm, depth of 800mm, height of 2350mm. The main structure is as follows: ventilation cabinet cabinet: cabinet ventilation cabinet can be made of steel, wood, plastic, stainless steel and other materials in accordance with the requirements; the table and liner: corrosion resistance, acid and alkali resistance, high temperature materials, the inner plate high temperature or strong acid operation to slag and epoxy resin powder oil electrostatic spraying with stainless steel; the movable door arranged on the transparent glass on the surface of the cabinet body, users from harmful chemicals and gases, and the harmful gas pipeline to internal ventilation cabinet; the guide plate: control flow through ventilation cabinet shape, reduce the production of air into the ventilation cabinet when due is caused by the reflux or eddy current, improve the use efficiency (affect noise and static pressure); the collector: at the top of the ventilation cabinet, the gas guiding air ventilation cabinet Emissions (the efficiency and noise of ventilation cabinet has a important effect); the air regulating valve: ventilation cabinet accessories, to adjust the section of the fume hood exhaust quantity and optimal surface wind speed; seventhly, hydrants, cocks, cups and other accessories. 2, universal exhaust hood: mainly for PP material specifications with 110mm.
3, atomic absorption cover: mainly for stainless steel materials, specifications are generally 400 x 400mm. Four, ventilation pipe material requirements 1, circular duct ventilation efficiency is high, but not too large diameter. Due to the large temperature difference between indoor and outdoor, outdoor pipe can be used for glass steel products, for the general laboratory, if the indoor emissions of gas is not corrosive, the wind pipe can be galvanized iron sheet. 2, if the exhaust emissions laboratory corrosion, wind pipe should be made of anti corrosion materials PVC, glass steel duct; if the ventilation system of waste gas containing a strong acid, such as hydrochloric acid, nitric acid, etc.), ventilation pipe should choose PP material. In the case of no or only slight corrosion or customer requirements, can also use stainless steel air duct. 3, if requested by the client complement wind system can be used in galvanized pipe air supply, air supply fan can also choose low noise sound axial flow fan, under special circumstances, consider the hose connection (such as aluminum foil, plastic hose pipe). Five, dimensions and the calculation method of ventilation line 1, the commonly used circular wind pipe size: (1) a single atomic absorption cover the main selection of phi 160 (DN150) tube; II universal smoke exhaust cover the main selection of phi 110 (DN100); (3) a single, two ventilation cabinet, dry pipe selection of phi 315 (DN300) tube. 2, the commonly used square wind pipe size: if the system is complex, or in the same room in parallel with three or more than three sets of ventilation cabinet, or the height of laboratory Co., circular duct cannot be installed can consider to choose square wind pipe. Square wind pipe length of standard size (unit: mm): 120, 160, 200, 320, 400, 500, 630, 800, 1000, 1250, the ventilation cabinet width 800mm, so the selection of tube side length size should not be more than 630 mm. And it is best to choose a square, if the conditions are not allowed to also can choose the rectangle, but each of the single best unified as follows. 3, the wind pipe size method: (1) circular duct calculation method: q = (3600 x PI D2V) quarter {Q-- exhaust volume, m3 / h; D - air pipe diameter, mm; V, wind speed in the pipe, M / S; II square wind pipe calculation method: Q=3600 * a - B - V, {Q-- exhaust volume, m3 / h; a, B - wind pipe length, mm; wind speed V -- tube, m/s}. 4, the wind pipe thickness standard: according to national standards, the ventilation system belongs to medium and low pressure system. And low pressure system PVC circular wind pipe thickness standards are as follows: the wind pipe diameter D (mm) sheet thickness (mm) d is less than or equal to 320 3.0 3.2 < d < 630 4.0 6.3 < d < 1000 5.0
1000 < D is less than or equal to 2000 6.0, low-pressure system PVC square wind pipe thickness standards are as follows: wind pipe size B (mm) sheet thickness (mm) B is less than or equal to 320 3.0 3.2 < B is less than or equal to 4.0 500 500 < B is equal to or less than 800 5.0 800 < B is less than or equal to 12.5 6.0, low-pressure system glass steel circular wind pipe thickness criteria are as follows: the wind pipe diameter D (mm) or square wind pipe edge B (mm

 

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laboratory  ventilation system( fume hood system@ chemical fume hood systems@chemical hoods system ----- technical data descriptionslaboratory  ventilation system( fume hood system@ chemical fume hood systems@chemical hoods system ----- technical data descriptionslaboratory  ventilation system( fume hood system@ chemical fume hood systems@chemical hoods system ----- technical data descriptionslaboratory  ventilation system( fume hood system@ chemical fume hood systems@chemical hoods system ----- technical data descriptions

 

 

Pub Time : 2016-03-06 17:08:42 >> News list
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