機械通風是我國綠色儲糧技術(shù)之一。如何在通風降溫的同時還能大程度地保持糧食水分是值得探索的。隨著通風技術(shù)持續(xù)創(chuàng)新，緩式通風的技術(shù)優(yōu)勢逐漸被發(fā)現(xiàn)！緩式通風即采用相對較小的風壓和風速進行通風?？吹竭@里，你是不是也想在自家糧倉試一試？

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?

離心風機是根據(jù)動能轉(zhuǎn)換為勢能的原理，利用高速旋轉(zhuǎn)的葉輪將氣體加速，然后減速、改變流向，使動能轉(zhuǎn)換成勢能（壓力）。在單級離心風機中，氣體從軸向進入葉輪，氣體流經(jīng)葉輪時改變成徑向，然后進入擴壓器。

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.

在擴壓器中，氣體改變了流動方向造成減速，這種減速作用將動能轉(zhuǎn)換成壓力能。壓力增高主要發(fā)生在葉輪中，其次發(fā)生在擴壓過程。在多級離心風機中，用回流器使氣流進入下一葉輪，產(chǎn)生更高壓力。

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.

對離心風機設計的要求大都是：滿足所需流量和壓力的工況點應在率點附近；率值要盡量大一些，效率曲線平坦；壓力曲線的穩(wěn)定工作區(qū)間要寬；風機結(jié)構(gòu)簡單，工藝性好；材料及附件選擇方便；有足夠的強度、剛度，工作可靠；運轉(zhuǎn)穩(wěn)定，噪聲低；調(diào)節(jié)性能好，工作適應性強；風機尺寸盡可能小，重量輕；操作和維護方便，拆裝運輸簡單易行。

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，同時滿足上述全部要求，一般是不可能的。在氣動性能與結(jié)構(gòu)(強度、工藝)之間往往也有矛盾，通常要抓住主要矛盾協(xié)調(diào)解決。這就需要設計者選擇合理的設計方案，以解決主要矛盾。

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.

機械通風技術(shù)雖然已被證明可行有效，但還有很大的提升空間。倉房結(jié)構(gòu)、風道布局、風機型號都可能是創(chuàng)新的切入點，能耗、時耗、效率都可能是創(chuàng)新的突破口。告別粗放，集約化、精細化將是我國儲糧技術(shù)發(fā)展的必然趨勢。

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.