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        前后倾离心风机区分及特点
      1. 上海风机厂家
      2. 来源:www.qddmscl.com
      3. 浏览: 1,012 views
      4. 离心风机按照装配风机叶片的不同,可以分为前倾与后倾。前倾式一般为鼓风机,后倾式为引风机。
        下面上海3C消防负压轴流离心风机排烟防火阀生产厂家-上海汇弘风机生产厂家小编为您详细介绍前倾离心风机与后倾离心风机的区别以及特点。

        前后倾离心风机区分及特点

        前倾与后倾离心风机,它们的区别是叶轮横档和叶轮边缘的长度,前倾是和叶轮边缘平行,叶轮出口角大于90度为前倾叶轮也称为前向叶轮,前向叶轮以高压的居多;后倾和叶轮不平行,长度到叶轮边缘相差几公分或是几毫米,指叶轮出口角小于90度为后倾叶轮也称为后向叶轮,后向叶轮主要以中压为主。具体的区别及特点主要体现在以下这些方面。

        前倾离心风机:
        制作:采用优质钢板压折制作
        优点:造价低、转速低,可选用较细的轴和较小的轴承,且具有较宽的操作范围。 缺点:性能曲线形状可能与管网阻力曲线平行,且系统静压降低可能导致电机过载。另外,
        叶片结构强度较低,不能运行于较高的转速。
        后倾离心风机:
        制作:铸造
        优点:效率高且功率曲线无过载。其功率曲线通常在常用范围的中部达到zui大值,这样一般
        不会超载。叶片及叶轮的自身结构强度较高,可使用于较高的静压系统。噪声低、风量大、高效区宽广
        缺点:由于叶轮运行速度较高,所以需要较粗的轴及较大的轴承且对平衡的要求较高,另外
        静压的波动容易引起工况的变化
        适用场所:送风换气、消防、除尘、排烟

        效率
        1、由于前倾叶片传给气流之绝对速度C较后倾叶片大,因此气流的动能在机壳螺线室内
        转化为压力能的损失也较大,因此用以克服系统阻力的静压头占的比例很小。而后倾叶片传给气流之绝对速度C较小,因此气流在能量转化时的损失较小,因此用以克服系统阻力的静压头占的比例较大
        2、后倾叶片风机中槽道一般是逐渐扩大的,而且比前倾叶片的槽道扩大的较为缓和,另
        外后倾叶片的弯曲度比前倾叶片的弯曲度小,所以气流在后倾叶片槽道中流动的水力损失比前倾叶片小。

        电能消耗
        通风机的轴功率表示: N=(rQH)/102η
        N—通风机轴功率
        Q—通风机风量
        H—通风机压头
        η—通风机效率
        r—空气的容重
        由上式可看出,风机效率的高低直接影响到风机轴功率的大小。后倾叶片风机的效率高,风机所需轴功率小,消耗的电能就少。
        而前倾式叶片风机的效率低,风机所需轴功率大,消耗的电能就多。

        我们看到,前倾与后倾离心风机的区别主要体现在功率、电能消耗、噪音这些方面。
        无论是前倾还是后倾离心风机,有着各自的优缺点,用户可根据实际需要进行选择。
        并且,在应用过程中应扬长避短,最高效使用离心风机、发挥其最大功用,为企业创造更大的价值。

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