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如何从设计方面预防屋顶风机的腐蚀
文章来源 : 中大空调集团有限公司发布时间 :2017-07-25 17:45:13浏览量 :
 由于屋顶空气环境恶劣,特别是雨季过后,钢结构腐蚀严重,严重影响了屋顶风机的使用寿命和美观。如果防止这种情况发生?接下来小编就给大家介绍一下如何从设计方面预防屋顶风机的腐蚀,希望会对您有所帮助!
  1、很多屋顶送风机未设置停机后防止空气倒流的装置,或是屋顶风机停机后阀门不能可靠关闭,对于热压较大的车间其热损失不可低估。大家经常可以看到无逆止装置的屋顶风机和轴流风机,在热压作用下风机高速旋转,这一现象说明热压造成的风速相当大,风筒内的风速可达2.0~3.0m/s以上。风机倒转对电动机启动很不利,可能因启动电流过大而损坏。
  2、防结露性能较差,冬季室内外温差较大,风筒上容易结露,产生滴水现象,以至影响正常生产。
  3、屋顶风机必须具备可靠的防雨、防飞雪与防风沙的基本性能,但目前很多屋顶风机在设计时仅考虑防雨功能,忽略了飞雪与风沙不仅会从上部进入风机,在室外风速达到一定强度的情下,还可能从下部进入风机。一些采用内部活动百叶作空气逆止装置的屋顶风机,看起来可以防止飞雪落入室内,其实飞雪聚集于活动百叶上,经室内温度融化后会造成滴水现象,不能起到防飞雪作用。
  4、在台风和沙尘暴多发地区,屋顶风机抗强风能力较差,重心偏高,平面和凹面结构增大风阻,伞形防雨帽的抗强风性能极不理想。
  
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