機(jī)械通風(fēng)是我國綠色儲(chǔ)糧技術(shù)之一。如何在通風(fēng)降溫的同時(shí)還能大程度地保持糧食水分是值得探索的。隨著通風(fēng)技術(shù)持續(xù)創(chuàng)新，緩式通風(fēng)的技術(shù)優(yōu)勢(shì)逐漸被發(fā)現(xiàn)！緩式通風(fēng)即采用相對(duì)較小的風(fēng)壓和風(fēng)速進(jìn)行通風(fēng)?？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(fēng)機(jī)是根據(jù)動(dòng)能轉(zhuǎn)換為勢(shì)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(dòng)能轉(zhuǎn)換成勢(shì)能（壓力）。在單級(jí)離心風(fēng)機(jī)中，氣體從軸向進(jìn)入葉輪，氣體流經(jīng)葉輪時(shí)改變成徑向，然后進(jìn)入擴(kuò)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(kuò)壓器中，氣體改變了流動(dòng)方向造成減速，這種減速作用將動(dòng)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(kuò)壓過程。在多級(jí)離心風(fēng)機(jī)中，用回流器使氣流進(jìn)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(duì)離心風(fēng)機(jī)設(shè)計(jì)的要求大都是：滿足所需流量和壓力的工況點(diǎn)應(yīng)在率點(diǎn)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(fēng)機(jī)結(jié)構(gòu)簡單，工藝性好；材料及附件選擇方便；有足夠的強(qiáng)度、剛度，工作可靠；運(yùn)轉(zhuǎn)穩(wěn)定，噪聲低；調(diào)節(jié)性能好，工作適應(yīng)性強(qiáng)；風(fēng)機(jī)尺寸盡可能小，重量輕；操作和維護(hù)方便，拆裝運(yùn)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(shí)滿足上述全部要求，一般是不可能的。在氣動(dòng)性能與結(jié)構(gòu)(強(qiáng)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(shè)計(jì)者選擇合理的設(shè)計(jì)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(jī)械通風(fēng)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(fēng)道布局、風(fēng)機(jī)型號(hào)都可能是創(chuàng)新的切入點(diǎn)，能耗、時(shí)耗、效率都可能是創(chuàng)新的突破口。告別粗放，集約化、精細(xì)化將是我國儲(chǔ)糧技術(shù)發(fā)展的必然趨勢(shì)。

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.