風(fēng)管加工應(yīng)注意的三個問題!

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通風(fēng)系統(tǒng)的劃分：

Division of ventilation system:

不同地區(qū)的工業(yè)通風(fēng)系統(tǒng)對送風(fēng)和排風(fēng)有不同的要求。當(dāng)面積較大時，對應(yīng)的供排氣點較多，可分為若干個供排氣子系統(tǒng)，一個系統(tǒng)由一個風(fēng)機(jī)及其連接的管道組成，便于管理。系統(tǒng)劃分的主要依據(jù)是：如果生產(chǎn)過程和運行時間相同，建議將其劃分為一個系統(tǒng);如果運行參數(shù)和空氣處理要求相同，建議將其分成一個系統(tǒng);不建議將風(fēng)扇附近排氣量較大的排氣點分成一個系統(tǒng)，這將增加排氣系統(tǒng)的阻力。此外，如果兩種或兩種以上的有害物質(zhì)混合在一起，會增加毒性和腐蝕性，并容易引起火災(zāi)和爆炸，它們不能被分成一個系統(tǒng)。建議單獨設(shè)置排氣系統(tǒng)。

Industrial ventilation systems in different regions have different requirements for air supply and exhaust. When the area is large, there are many corresponding air supply and exhaust points, which can be divided into several air supply and exhaust subsystems. One system is composed of a fan and its connected pipes, which is convenient for management. The main basis of system division is: if the production process and running time are the same, it is recommended to divide it into one system; If the operating parameters and air handling requirements are the same, it is recommended to divide them into one system; It is not recommended to divide the exhaust points with large exhaust volume near the fan into a system, which will increase the resistance of the exhaust system. In addition, if two or more harmful substances are mixed together, they will increase toxicity and corrosiveness, and easily cause fire and explosion. They cannot be divided into a system. It is recommended to set the exhaust system separately.

2.通風(fēng)管道材料的選擇：

2. Selection of ventilation duct materials:

風(fēng)管加工主要由鋼板、金屬軟管、塑料和橡膠軟管、纖維板、膠合板、石膏板、聚氯乙烯塑料板、磚和混凝土等制成。鋼板是通風(fēng)管道常用的材料，具有耐腐蝕、耐高溫的特點，便于制造和安裝。一些通風(fēng)管道在技術(shù)上需要經(jīng)常移動，這需要柔性材料，如金屬軟管、塑料軟管和橡膠軟管。硬質(zhì)聚氯乙烯塑料板表面光滑，加工方便，但不耐高溫，適用于腐蝕性工業(yè)通風(fēng)和排氣系統(tǒng)。磚和混凝土制成的通風(fēng)管主要適用于與建筑物連接，阻力小，經(jīng)久耐用。總之，通風(fēng)管道的材料應(yīng)根據(jù)應(yīng)用條件綜合選擇。

Air duct processing is mainly made of steel plate, metal hose, plastic and rubber hose, fiberboard, plywood, gypsum board, PVC plastic board, brick and concrete. Steel plate is a commonly used material for ventilation pipes, which has the characteristics of corrosion resistance and high temperature resistance, and is convenient for manufacturing and installation. Some ventilation pipes need to be moved frequently technically, which requires flexible materials, such as metal hoses, plastic hoses and rubber hoses. Rigid PVC plastic plate has smooth surface and convenient processing, but it is not resistant to high temperature. It is suitable for corrosive industrial ventilation and exhaust systems. The ventilation pipe made of brick and concrete is mainly suitable for connecting with buildings, with low resistance and durability. In a word, the material of ventilation duct should be comprehensively selected according to the application conditions.

3.通風(fēng)管道截面形狀的選擇：

3. Selection of cross-section shape of ventilation duct:

風(fēng)管加工時的截面形狀一般分為矩形和圓形。在相同橫截面積的情況下，圓形通風(fēng)管道不僅阻力小，而且強(qiáng)度高，節(jié)省了管道。對于圓形通風(fēng)管道，直徑越小，制造越容易，保溫越方便。但是，矩形通風(fēng)管道的管件比圓形通風(fēng)管道的管件容易制作，布局也比圓形通風(fēng)管道簡單。在正常情況下，當(dāng)通風(fēng)管的橫截面較小，管內(nèi)流速較高時，宜采用圓形通風(fēng)管;通風(fēng)管道截面較大時，應(yīng)采用矩形通風(fēng)管道，并能充分利用建筑空間。對于矩形通風(fēng)管道，寬高比越接近1越好，這樣不僅可以節(jié)省運行功率，還可以節(jié)省投資。

The cross-section shape of air duct processing is generally divided into rectangular and circular. In the case of the same cross-sectional area, the circular ventilation duct not only has small resistance, but also has high strength, which saves the pipe. For circular ventilation ducts, the smaller the diameter, the easier it is to manufacture and the more convenient it is to keep heat. However, the pipe fittings of rectangular ventilation duct are easier to make than those of circular ventilation duct, and the layout is also simpler than that of circular ventilation duct. Under normal circumstances, when the cross-section of the ventilation pipe is small and the flow rate in the pipe is high, the circular ventilation pipe should be used; When the cross-section of ventilation duct is large, rectangular ventilation duct shall be used and the building space shall be fully utilized. For rectangular ventilation ducts, the closer the width height ratio is to 1, the better. This can not only save operating power, but also save investment.

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