叶轮：严重汽蚀(特别是主叶片)、过度腐蚀、磨损、破损时，要求更换叶轮。
Impeller: Sure to change impeller if it has serious cavitations (main vanes in particular), over corrosion, wear and tear and breakage.
对现有风机节能改造可采用更换或切削叶轮、调整可调叶片角度，改变扩压器叶片角度以及风机变速运行等措施。
Changing or cutting the impeller, adjusting the angles of variable blades, changing the angles of pressure expander and variable speed of fans may be adopted for the energy-saving of fans on hand.
我们生产的排风机是一款插塞式排风机，更换风机叶轮、支架和轴承十分简单。
The recirculating and exhaust fans for each zone of the oven are of the plug fan type design to allow quick and easy replacement of the fan wheel, shaft and bearings if the need should ever arise.
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