神马av_日韩第一页_免费精品一区_神马AV_神马久久久久久久久_日韩无码第一页_色哒哒_无码人妻熟妇av又粗又_国产69久久久欧美黑人A片_日韩欧美亚洲_无码第一页_神马午夜精品91_无码人妻熟妇av又粗,日韩免费人妻无码专区蜜桃,亚洲阿大香蕉,欧美亚洲男人天堂,国产无码精品一区二区,揉着我的奶从后面进去视频,免费全部黄A片免费播放软件,国产色中色,免费看的久久久久,天美传媒部在线观看,久久久久久亚洲综合,大香蕉日韩成人在线视频,久久无码潮喷A片无码高潮动漫,精品久久亚洲熟女,国产欧美精品aaaaa久久,直男国产飞机杯,我的公把我弄高潮了视频,免费的精品一区二区三区片,国产日韩欧美三级,亚州A级片,自拍偷拍亚洲porn,少妇水多A片太爽了,日本久操,成人午夜福利无码不卡视频,国产一区二区不卡亚洲涩情,日韩欧美亚洲综合久久,国产亚洲精品久久孕妇呦呦你懂,国产又粗又长又大精品A片,自偷自拍亚洲综合精品第一页,亚洲欧美熟妇久久久久久久久 ,香蕉视频操逼奶子

　　According to the principle that kinetic energy is converted into potential energy, centrifugal fan uses high-speed rotating impeller to accelerate the gas, then decelerates and changes the flow direction, so that kinetic energy is converted into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, changes to the radial direction when passing through the impeller, and then enters the diffuser. In the diffuser, the movement direction of the gas is changed and the cross-section area of the pipe is increased to slow down the gas flow.

　　這種減速作用將動能轉(zhuǎn)換成壓力能。壓力增高主要發(fā)作在葉輪中，其次發(fā)作在擴壓過程。在多級離心風(fēng)機中，用回流器使氣流進入下一葉輪，產(chǎn)生更高壓力。離心風(fēng)機本質(zhì)是一種變流量恒壓安裝。當(dāng)轉(zhuǎn)速一定時，離心風(fēng)機的壓力-流量理論曲線應(yīng)是一條直線。由于內(nèi)部損失，實踐特性曲線是彎曲的。離心風(fēng)機中所產(chǎn)生的壓力遭到進氣溫度或密度變化的較大影響。

　　This deceleration converts kinetic energy into pressure energy. The increase of pressure mainly occurred in the impeller, followed by the expansion process. In the multistage centrifugal fan, the air flow is sent into the next impeller with a reflux device to produce higher pressure. Centrifugal fan is essentially a variable flow and constant pressure installation. When the rotating speed is fixed, the theoretical curve of pressure flow of centrifugal fan should be a straight line. Due to internal losses, the practical characteristic curve is curved. The pressure produced in the centrifugal fan is greatly affected by the change of inlet air temperature or density.

　　對一個給定的進氣量，進氣溫度（空氣密度）時產(chǎn)生的壓力。關(guān)于一條給定的壓力與流量特性曲線，就有一條功率與流量特性曲線。當(dāng)鼓風(fēng)機以恒速運轉(zhuǎn)時，關(guān)于一個給定的流量，所需的功率隨進氣溫度的降低而升高。

　　For a given intake volume, the highest intake temperature (lowest air density) produces the lowest pressure. For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower is running at a constant speed, the required power increases with the decrease of inlet air temperature for a given flow.

　　磨損問題離心風(fēng)機傳動部位磨損是常呈現(xiàn)的設(shè)備問題，其中包括抽風(fēng)機軸承位、軸承室磨損、鼓風(fēng)機軸軸承位磨損等。針對離心風(fēng)機上述毛病，傳統(tǒng)維修辦法有堆焊、熱噴涂、電刷渡等，但均存在一定弊端：補焊高溫產(chǎn)生的熱應(yīng)力無法完整消弭，易形成材質(zhì)損傷，招致部件呈現(xiàn)彎曲或斷裂；而電刷鍍受涂層厚度限制，容易剝落。

　　The wear problem of the transmission part of the centrifugal fan is a common equipment problem, including the wear of the bearing position of the suction fan, the bearing chamber, and the bearing position of the blower shaft. In view of the above problems of centrifugal fan, the traditional maintenance methods include overlay welding, thermal spraying, brush crossing, etc., but all of them have some disadvantages: the thermal stress generated by high temperature of repair welding can not be completely eliminated, and it is easy to form material damage, resulting in bending or fracture of parts; while brush plating is subject to the limitation of coating thickness, which is easy to peel off.