通風(fēng)管道的局部排風(fēng)結(jié)構(gòu)的組成原理

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(1)局部排風(fēng)罩

(1) local exhaust hood

局部排風(fēng)罩是用來(lái)捕集有害物的。它的性能對(duì)局部排風(fēng)系統(tǒng)的技術(shù)經(jīng)濟(jì)指標(biāo)有直接影響。性能良好的局部排風(fēng)罩，如密閉罩，只要較小的風(fēng)量就可以獲得良好的工作效果。由于生產(chǎn)設(shè)備和操作的不同，排風(fēng)罩的形式是多種多樣的。

The local exhaust hood is used to trap harmful substances. Its performance has a direct impact on the technical and economic indicators of the local exhaust system. Good performance of the local exhaust hood, such as airtight cover, as long as the smaller air volume can get good results. Because of the difference of production equipment and operation, the exhaust hood is various.

(2)風(fēng)管

(2) air duct

通風(fēng)系統(tǒng)中輸送氣體的管道稱為風(fēng)管，它把系統(tǒng)中的各種設(shè)備或部件連成了一個(gè)整體。為了提高系統(tǒng)的經(jīng)濟(jì)性，應(yīng)合理選定風(fēng)管中的氣體流速，管路應(yīng)力求短、直。風(fēng)管通常用表面光滑的材料制作，如：薄鋼板、聚氯乙烯板，有時(shí)也用混凝土、磚等材料。

The duct of the air in the ventilation system is called an air duct, which connects the various devices or components into a whole. In order to improve the economy of the system, the gas flow velocity in the air duct should be selected reasonably. The wind pipe is usually made of a smooth surface material, such as: steel sheet, PVC board, and sometimes also with concrete, brick and other materials.

(3)除塵、凈化設(shè)備

(3) dust removing and purifying equipment

為了防止大氣污染，當(dāng)排出空氣中有害物量超過(guò)排放標(biāo)準(zhǔn)時(shí)，必須用凈化設(shè)備處理，達(dá)到排放標(biāo)準(zhǔn)后，排人大氣。凈化設(shè)備分除塵器和有害氣體凈化裝置兩類。

In order to prevent air pollution, when the discharge of harmful substances in the air exceeds the discharge standard, must be treated with purification equipment, to achieve emission standards, the exhaust air. Purification equipment, dust collector and harmful gas purification device two.

(4)風(fēng)機(jī)

(4) fan

風(fēng)機(jī)向機(jī)械排風(fēng)系統(tǒng)捉供空氣流動(dòng)的動(dòng)力。為了防止風(fēng)機(jī)的磨損和腐蝕，通常把它放在凈化設(shè)備的后面。

Fan to the mechanical exhaust system to capture the power of air flow. In order to prevent wear and corrosion of the fan, it is usually placed behind the purification equipment.

如果只對(duì)局部地點(diǎn)進(jìn)行排風(fēng)或送風(fēng)，即局部通風(fēng);如果對(duì)整個(gè)車間進(jìn)行排風(fēng)或送風(fēng)，則為通風(fēng)。

If only the local location of the exhaust or air supply, that is, local ventilation; if the entire workshop for air or air supply, the overall ventilation.

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