机械通风是我国绿色储粮技术之一。如何在通风降温的同时还能大程度地保持粮食水分是值得探索的。随着通风技术持续创新，缓式通风的技术优势逐渐被发现！缓式通风即采用相对较小的风压和风速进行通风。看到这里，你是不是也想在自家粮仓试一试？
Mechanical ventilation is one of the green grain storage technology in China. It is worth exploring how to keep the moisture of grain to the maximum at the same time when the ventilation is cooled. With the continuous innovation of ventilation technology, the technical advantages of slow ventilation have been gradually discovered! Gentle ventilation is the use of relatively small wind pressure and wind speed for ventilation. See here, do you want to try it in your own granary?
离心风机是根据动能转换为势能的原理，利用高速旋转的叶轮将气体加速，然后减速、改变流向，使动能转换成势能（压力）。在单级离心风机中，气体从轴向进入叶轮，气体流经叶轮时改变成径向，然后进入扩压器。
Centrifugal fan is based on the principle of converting kinetic energy into potential energy, and accelerates the gas with high speed rotating impeller, then decelerates and changes the direction of flow, so that kinetic energy can be converted into potential energy (pressure). In a single stage centrifugal fan, the gas enters the impeller from the axial direction, and the gas flows through the impeller into the radial direction and then enters the diffuser.
在扩压器中，气体改变了流动方向造成减速，这种减速作用将动能转换成压力能。压力增高主要发生在叶轮中，其次发生在扩压过程。在多级离心风机中，用回流器使气流进入下一叶轮，产生更高压力。
In the diffuser, the gas changes the flow direction to decelerate, which converts the kinetic energy into the pressure energy. The pressure increases mainly in the impeller, followed by the expansion process. In a multistage centrifugal fan, a reflux is used to make the air flow into the next impeller and produce higher pressure.
对离心风机设计的要求大都是：满足所需流量和压力的工况点应在率点附近；率值要尽量大一些，效率曲线平坦；压力曲线的稳定工作区间要宽；风机结构简单，工艺性好；材料及附件选择方便；有足够的强度、刚度，工作可靠；运转稳定，噪声低；调节性能好，工作适应性强；风机尺寸尽可能小，重量轻；操作和维护方便，拆装运输简单易行。
The design of centrifugal fan are: requirements to meet the needs of the flow and pressure of the operating point should be in the vicinity of the highest efficiency; the highest efficiency value will be as large as possible, the efficiency curve is flat; pressure curve stable working range is wide; the wind machine has the advantages of simple structure, good manufacturability; materials and accessories to choose convenient enough; the strength, stiffness, safe and reliable; stable operation, low noise; good regulation performance, work and strong adaptability; fan size as small as possible, light weight; convenient operation and maintenance, disassembly and transportation is simple.
然而，同时满足上述全部要求，一般是不可能的。在气动性能与结构(强度、工艺)之间往往也有矛盾，通常要抓住主要矛盾协调解决。这就需要设计者选择合理的设计方案，以解决主要矛盾。
However, it is generally impossible to meet all the above requirements at the same time. There is often a contradiction between the aerodynamic performance and the structure (strength and process), and the main contradiction is usually solved. This requires the designer to choose a reasonable design scheme to solve the main contradictions.
机械通风技术虽然已被证明可行有效，但还有很大的提升空间。仓房结构、风道布局、风机型号都可能是创新的切入点，能耗、时耗、效率都可能是创新的突破口。告别粗放，集约化、精细化将是我国储粮技术发展的必然趋势。
Although mechanical ventilation has been proved feasible and effective, there is still a lot of room for lifting. Warehouse structure, channel layout, fans are likely to be the starting point of innovation, energy consumption, time consumption, efficiency may be a breakthrough innovation. It is an inevitable trend for the development of grain storage technology in China to say goodbye to extensive, intensive and refined.
上一篇：别让你的通风管道想你吐槽！
下一篇：论油烟净化器对环境和健康的影响！
