一、材料方面
1. Material aspects
為增強(qiáng)全金屬構(gòu)造的屋頂風(fēng)機(jī)的抗腐蝕性能，可以運(yùn)用整機(jī)熱鍍鋅，同樣能夠運(yùn)用鋁合金來做防雨帽。為了處理好全玻璃鋼構(gòu)造的屋頂風(fēng)機(jī)的老化問題，一般運(yùn)用增大玻璃鋼厚度的方法來強(qiáng)化處理，此肯定會提高生產(chǎn)成本，所以全玻璃鋼構(gòu)造的屋頂風(fēng)機(jī)的物料成本要比全金屬構(gòu)造的屋頂風(fēng)機(jī)高，依照測算，就結(jié)構(gòu)成本2者就差了30%差不多;有效的辦法為屋頂風(fēng)機(jī)使用鋼-玻璃鋼的復(fù)合構(gòu)造，防雨帽和逆止閥部分運(yùn)用的是玻璃鋼制作而成。完全將玻璃鋼的耐銹能力優(yōu)，并且易于造型的特征發(fā)揮出來，能按照氣流組織與美學(xué)要求制作成各類不同功能的屋頂風(fēng)機(jī)，讓風(fēng)機(jī)阻力變得少，外觀形態(tài)更美觀;風(fēng)筒與基礎(chǔ)零件運(yùn)用鋼構(gòu)造且通過熱鍍鋅方式進(jìn)行處理，此能確保此構(gòu)造的強(qiáng)度與防腐的要求，某些連接配件直接焊接到風(fēng)筒上，讓生產(chǎn)工藝簡易化。
In order to enhance the corrosion resistance of the roof blower with all metal structure, the whole machine can be galvanized, and aluminum alloy can also be used as a rain helmet. In order to deal with the aging problem of the roof blower in the whole glass steel structure, the method of increasing the thickness of the glass steel is generally used to strengthen the treatment. This will certainly increase the production cost, so the material cost of the whole glass steel structure roof fan is higher than that of the whole metal structure roof fan. According to calculation, the cost of the structure of the 2 is less than 3. 0% almost. The most effective way is to use steel FRP composite structure for roof fans. The rain cap and check valve parts are made of FRP. The features of the FRP are excellent, and the features are easy to be made. They can be made into various functional roofing fans according to the air flow organization and aesthetic requirements, making the fan resistance at least and the appearance more beautiful; the wind and basic parts are made of steel and treated by hot galvanizing. This can be true. To ensure the strength and corrosion resistance of the structure, some connection accessories are directly welded to the wind tube to simplify the production process.
二、余壓方面
Two, residual pressure aspect
在確保屋頂風(fēng)機(jī)有額定的風(fēng)量前提之下，需確保大于50Pa的余壓提供給用戶運(yùn)用。
Under the premise of ensuring the rated air volume of the roof blower, it is necessary to ensure that the residual pressure greater than 50Pa is provided to the users.
三、止逆和方面
Three, inverses and safety aspects
屋頂風(fēng)機(jī)都設(shè)置了在機(jī)器停止運(yùn)作時可以關(guān)閉的逆止裝置。能夠配裝活頁風(fēng)門，活頁風(fēng)門存在重力式、電動式及手動式這三類，能依照工程要求來進(jìn)行選用。在設(shè)計(jì)中，如果所運(yùn)用的屋頂風(fēng)機(jī)無逆止性的時候，測算采暖熱負(fù)荷的時候需充分思考一下屋里熱空氣的損失和屋外冷空氣的侵入所導(dǎo)致的部分熱量的散失。在嚴(yán)寒區(qū)域，還需思考其對值班采暖的干擾。在風(fēng)機(jī)下面需配設(shè)堅(jiān)實(shí)、牢固及可靠的網(wǎng)來保證。
The roof blower is equipped with a backstop which can be safely shut down when the machine is stopped. It can be equipped with loose leaf throttle, and there are three kinds of loose door throttle, gravity, electric and manual, which can be selected according to engineering requirements. In the design, when the roof fan is used in the design, it is necessary to think about the loss of hot air in the house and the partial heat loss caused by the intrusion of cold air outside the roof when calculating the heating load. In severe cold areas, it is also necessary to consider its interference with duty heating. A solid, solid and reliable safety net should be provided below the fan to ensure safety.
四、防結(jié)露方面
Four. Prevention of dew
在設(shè)計(jì)屋頂風(fēng)機(jī)的時候，需盡大可能減少屋里外空氣一起接觸部分的面積，降低結(jié)露量。在工程設(shè)計(jì)中，考慮到因素，屋頂風(fēng)機(jī)的配裝位置需盡可能避開工藝裝備與工作崗位的正上方，降低滴水對生產(chǎn)的干擾。
When designing the roof blower, it is necessary to minimize the area of the air contact part outside the house and reduce the dew amount. In engineering design, taking into account the safety factors, the position of the roof fan should be avoided to the top of the equipment and job as far as possible to reduce the interference of the dripping water to the production.
五、防強(qiáng)風(fēng)方面
Five. To prevent strong wind
在臺風(fēng)和強(qiáng)風(fēng)頻發(fā)的地方，需選擇使用擁有良好的抗臺風(fēng)性能的屋頂風(fēng)機(jī)，它的需盡量保持低一點(diǎn)，可使用流線型的構(gòu)造來降低風(fēng)阻，傘形的防雨帽的抗風(fēng)性能非常不理想，好不要使用此構(gòu)造。強(qiáng)風(fēng)來臨歸于非正常狀況，防雨帽的設(shè)計(jì)能夠依照停機(jī)情況來進(jìn)行考慮。在臺風(fēng)和強(qiáng)風(fēng)頻發(fā)的地方所運(yùn)用的屋頂風(fēng)機(jī)還能考慮額外配裝自動副翼，盡管在刮特大風(fēng)的天氣狀況下，因配裝了自動副翼會降低風(fēng)及雨的大量涌入。副翼會經(jīng)過彈簧恢復(fù)原位，并且副翼還可以起著減少空氣阻力的流片的功用，實(shí)現(xiàn)增強(qiáng)風(fēng)量的效果。
In places where typhoons and strong winds occur frequently, it is necessary to choose a roof fan with good anti typhoon performance. Its center of gravity needs to be kept as low as possible, and streamline structure can be used to reduce wind resistance. The anti wind performance of umbrella shaped rain cap is very undesirable. It is best not to use this structure. The advent of strong winds is due to abnormal conditions. The design of rainproof caps can be considered in the light of downtime. The roof blower used in typhoons and strong winds can also consider additional automatic ailerons, although in the windy weather conditions, the installation of an automatic aileron will reduce the influx of wind and rain. The aileron will be restored to the original position through the spring, and the aileron can also play the function of reducing the air resistance of the flow sheet to enhance the air volume.
六、噪聲方面
Six. The noise aspect
屋頂風(fēng)機(jī)需擁有良好的聲學(xué)指標(biāo)，為了把控噪聲，風(fēng)機(jī)的轉(zhuǎn)動速度不能大于1500r/min，以運(yùn)用960r/min的風(fēng)機(jī)為好。小于5000m3/h的屋頂風(fēng)機(jī)的噪聲需把控在50dB之下，高于5000m3/h的噪聲需把控60dB以下，且需要防止產(chǎn)生高頻噪音的問題。
Roof fans should have good acoustic indicators. In order to control noise, the speed of fan can not be greater than 1500r/min, and 960r/min fan is the best. The noise of the roof fan less than 5000m3/h needs to be controlled under the 50dB. The noise above the 5000m3/h needs to be controlled below the 60dB, and the problem of high frequency noise needs to be prevented.
七、運(yùn)作維護(hù)方面
Seven. Operation and maintenance
屋頂風(fēng)機(jī)不適合設(shè)置需人工進(jìn)行清理工作的空氣過濾器，若送風(fēng)存在清潔度的要求，需運(yùn)用另外的一些空氣處理方案。
The roof fan is not suitable for setting up the air filter which needs to be cleaned manually. If the air supply has the requirement of cleanliness, some other air treatment schemes should be used.
