後傾離心風機隻是由於氣體（tǐ）流速較低，壓力變化不大（dà），氣體比容（róng）的變化在通常情況下都不需要考慮，離心風機是最常用的機械通風設備，提高氣體壓力並（bìng）排送氣（qì）體的機械，離心風機是一種從動的流體機械，也就是（shì）說把氣體作為不可壓縮流體處（chù）理（lǐ）離心風機是依靠輸入的機械能（néng）。
Back-tilt centrifugal fan is only because the gas flow rate is low, pressure changes little, the change of gas specific capacity in normal circumstances do not need to be considered, centrifugal fan is the most commonly used mechanical ventilation equipment, improve gas pressure side by side gas delivery machinery, centrifugal fan is a driven fluid machinery, that is to say, as the gas The centrifugal fan for incompressible fluid treatment depends on the input mechanical energy.
1、殼內不應有掉入和遺留的工具和雜物，安裝時，注意檢查機殼，為了防止生鏽，減（jiǎn）少拆卸困（kùn）難，在一些接合麵上，應塗上一些潤滑脂或機械油，離心風機與地（dì）基接合（hé）麵，更不（bú）許將管道（dào）重量（liàng）加在風（fēng）機各部件上，如發現問題，應立即予以修好和調（diào）整。並注意保證風機的水（shuǐ）平位置。
In order to prevent rust and reduce the difficulty of disassembly, lubricating grease or mechanical oil should be applied on some joining surfaces. The joining surface between centrifugal fan and foundation should be coated, and the weight of pipeline should not be added to all parts of the fan, if problems are found. It should be repaired and adjusted immediately. And pay attention to ensure the horizontal position of the fan.
2、安裝前，應對風機（jī）各（gè）部件（jiàn）進行全麵（miàn）檢查。機件是否完整，葉（yè）輪與機殼的旋轉方向是否一致，進出風管（guǎn）道聯接時應調整使之自然（rán）吻（wěn）合，不得強行聯接，各（gè）部件聯接是否緊密（mì），葉輪、主軸、軸（zhóu）承等主要機件有無損傷，傳動組件是否靈（líng）活等等。
2, before the installation, check all parts of the fan thoroughly. Whether the machine parts are complete, whether the rotating direction of impeller and casing is the same, whether the inlet and outlet air pipes are connected naturally, not forcibly, whether the components are tightly connected, whether the main parts such as impeller, spindle, bearing are not damaged, whether the transmission components are flexible, etc.
在工（gōng）廠、礦井（jǐng）、隧道、冷卻塔等領域（yù）經常會用到離心風（fēng）機，那麽，我們應如何選擇一款適合自己的離心風機呢？
Centrifugal fans are often used in factories, mines, tunnels, cooling towers and other fields. So, how should we choose a suitable centrifugal fan?
1.選購時，應注意離心風機的風量、全壓、效（xiào）率、比聲壓級、轉速及電機（jī）功率等參數；
When choosing and purchasing the centrifugal fan, attention should be paid to such parameters as air volume, total pressure, efficiency, specific sound pressure level, rotational speed and motor power.
2.根據被輸送氣體的物理性質、化學（xué）性質、用途等的不同，選擇（zé）不同型號的離心風機；
2. Different types of centrifugal fans are selected according to the different physical, chemical and usage of the conveyed gas.
3.選擇風機（jī）的型號時，一（yī）般選擇風量為1.05～1.1，風壓為1.10～1.15 的安全係數，不宜采用過大的安全係（xì）數，以（yǐ）免通（tōng）風機（jī）長期處在低（dī）效率區運行；
3. When choosing the type of fan, generally choose the safety factor of air volume 1.05-1.1, air pressure 1.10-1.15, should not adopt excessive safety factor, in order to avoid the fan running in low efficiency area for a long time.
4.通風機應在高效率點附近工作（zuò），工作點應位（wèi）於性能曲（qǔ）線中全壓峰值點的右側，以使通風機能穩定運（yùn）行（háng）；
4. The fan should work near the high efficiency point, and the working point should be located on the right side of the peak point of total pressure in the performance curve, so that the fan can run stably.
5.風（fēng）機的選用設計工況效率不得低於風機最高效率的（de）90%；
The efficiency of selecting and designing the 5. fan is not less than 90% of the maximum efficiency of the fan.
6.當風機使用工（gōng）況（如（rú）氣體溫度、大（dà）氣壓力等（děng））與風機樣（yàng）本工況不一致時，應對（duì）風機性能進行修正。
6. When the working condition of the fan (such as gas temperature, atmospheric pressure, etc.) is not consistent with the working condition of the fan sample, the fan performance should be corrected.
我們在選擇離（lí）心風機時，應認真比較，根據上述措（cuò）施選擇一款適合自己的分（fèn）級，選擇過程中，還要優先選（xuǎn）擇（zé）效（xiào）率（lǜ）較高、機器尺寸較小（xiǎo）、重量輕、調節範圍較大的風機。
When choosing centrifugal fans, we should carefully compare, according to the above measures to select a suitable for their own classification, selection process, but also give priority to the selection of high efficiency, small machine size, light weight, large adjustment range of fan.
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