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　　Centrifugal fan is essentially a variable flow and constant pressure device. When the rotating speed is fixed, the theoretical curve of pressure flow of centrifugal fan should be a straight line. The actual characteristic curve is bent due to internal loss. The change of inlet temperature or density has a great influence on the pressure produced by centrifugal fan. For a given inlet, the pressure is minimum at the maximum inlet temperature (minimum air density).

　　對于給定的壓力和流量特性曲線，有一個功率和流量特性曲線。當風機以恒定速度運行時，給定流量所需的功率隨著進口溫度的降低而增大。離心風機驅動部分的磨損是常見的設備問題，包括抽風機的軸承位置、軸承腔的磨損、風機軸的軸承位置等。

　　For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the fan operates at a constant speed, the power required for a given flow increases with the decrease of the inlet temperature. The wear of the driving part of the centrifugal fan is a common equipment problem, including the bearing position of the suction fan, the wear of the bearing cavity, the bearing position of the fan shaft, etc.

　　鑒于上述離心風扇的問題,傳統的維修方法包括堆焊、熱噴涂、電動刷牙,等等,但都有一定的缺點:由高溫引起的熱應力的補焊不能完全消除,而且很容易形成物質損失,導致零件的彎曲或斷裂;而刷鍍則受鍍層厚度限制，容易剝落，而以上兩種方法都是金屬修復金屬，不能改變“硬到硬”的關系，在各種力量的配合下，仍會形成重新磨損的橡皮滾筒。

　　In view of the above problems of centrifugal fan, the traditional maintenance methods include surfacing, thermal spraying, electric brushing, etc., but they all have certain disadvantages: the repair welding of thermal stress caused by high temperature can not be completely eliminated, and it is easy to form material loss, resulting in bending or fracture of parts; However, brush plating is limited by the thickness of the coating, which is easy to peel off. The above two methods are metal repair metal, which can not change the "hard to hard" relationship. Under the coordination of various forces, the rubber drum will be formed again.

　　在當代西方國家，高分子復合材料多用于修復上述問題，應用更廣泛的是美國福斯特藍技術體系，該體系具有超強的附著力、優異的抗壓強度等綜合性能，可拆卸加工。不存在熱應力，修復厚度不受限制，同時，產品具有金屬數據無讓步，能吸收設備的震動和震動，防止再次磨損的可能性。

　　In the contemporary western countries, polymer composite materials are mostly used to repair the above problems, the most widely used is the American foster blue technology system, which has strong adhesion, excellent compressive strength and other comprehensive properties, and can be disassembled and processed. There is no thermal stress, and the repair thickness is unlimited. At the same time, the product has metal data without concession, which can absorb the vibration and vibration of the equipment and prevent the possibility of re abrasion.