后倾（qīng）离心风机只是由于气体流速较低，压力变化不大，气体比容的变化在通常情况下都不需要考虑（lǜ），离心风机是最常用的机械通风设备，提高气体压（yā）力并排送（sòng）气体的机械，离心风机是一种从动的流（liú）体机械，也就是（shì）说把气体作为不可压缩流体处（chù）理离心风机是依（yī）靠输入的机械能。
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、壳内不应有掉入和遗（yí）留的工具和杂物，安装时，注意检查（chá）机壳，为了防止生锈，减少（shǎo）拆卸困难，在一些接合面上，应涂上一些润滑脂或机械油，离心风机与地基接合面，更不许将管道（dào）重量加在风机各（gè）部件上，如发现问题，应立即予以修好和调整。并注意保证（zhèng）风（fēng）机的水平位（wèi）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（ān）装前，应对风机各部件进（jìn）行（háng）全面（miàn）检查。机件是否完整，叶轮与机（jī）壳的旋转方向是否一致，进出风管道（dào）联接（jiē）时应调整使（shǐ）之自然吻合，不得强行联接，各部件联接是否紧密，叶轮、主轴（zhóu）、轴承（chéng）等主要机件有无损（sǔn）伤，传动组件是否灵活等等。
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.
在工厂、矿井、隧（suì）道、冷却塔等领域经常会用到离心风机，那么，我们应如何选择一款适（shì）合自己的离心风机呢（ne）？
Centrifugal fans are often used in factories, mines, tunnels, cooling towers and other fields. So, how should we choose a suitable centrifugal fan?
1.选购时，应注意离心风机的风量、全压、效率、比声（shēng）压级、转速及电机功率等（děng）参数；
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.根据被输送气体的物理性质、化学性质、用途等的不同，选择（zé）不同型号的离心风机；
2. Different types of centrifugal fans are selected according to the different physical, chemical and usage of the conveyed gas.
3.选择风机的型号时，一般选择风量为（wéi）1.05～1.1，风压为1.10～1.15 的安全系数，不宜采用（yòng）过大的安全系数，以免通风机长期处在低效率区运行；
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.通风机应在高效（xiào）率点附近工作，工（gōng）作点应位于性能曲线中全压峰值点的右侧，以使通（tōng）风机（jī）能稳定运行；
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.风机的选用设计工况效率不（bú）得低于风机最高效（xiào）率的90%；
The efficiency of selecting and designing the 5. fan is not less than 90% of the maximum efficiency of the fan.
6.当风机使用工况（如气体温（wēn）度、大气（qì）压力等）与风机样本工况不一致时，应对风（fēng）机性能进行修正。
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.
我们在选择离心风机时，应认真（zhēn）比较，根据上述措（cuò）施选择一款适合自己的分级，选择（zé）过程中，还（hái）要优先选择效率较高、机器尺寸较小、重量轻、调节范围（wéi）较大的风机。
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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