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1 老式通风口的缺陷 通风口是粮食在储藏过程中与外界环境相通的“门户”,又是机械通风系统或环流熏蒸系统中的关键部位。老式通风口一般是圆形或方形,采用螺栓固定。由于设计和制作上的缺陷,在实际工作中存在以下不足:
1 defects of the old vents Ventilation is the food in the storage process with the external environment of the “gateway”, but also mechanical ventilation system or circulation fumigation system in the key parts. Old vents are generally round or square, bolted. Due to the defects in design and production, the following deficiencies exist in practical work: