过滤器阻力损失

过滤器阻力损失

Filter resistance loss

ΔP－－阻力损失，Pa

ΔP－－Resistance loss，Pa

λ－－摩擦系数，无因次

λ－－Friction coefficient,Dimensionless

Re－雷诺数，Re=(ω·dn)/u，无因次

Re－Reynolds number，Re=(ω·dn)/u，Dimensionless

ω－流体速度，m/s

ω－Fluid velocity，m/s

ρ－流体密度，kg/m³

ρ－Fluid density，kg/m³

μ－动力粘度，kg/m·s

μ－Dynamic viscosity，kg/m·s

u－运动粘度u=μ/ρ，m²/s

u－movement viscosity u=μ/ρ，m²/s

L－当量直管段长度，m，类管件过滤器查阅下表“类管件过滤器公称直径与当量

直管段长度关系”

L－Equivalent ascending pipe segment size，m， Kind of fitting filter consult next table “Kind of fitting filter nominal diameter and equivalent ascending pipe segment size relations”

D－类管件过滤器内径，m

D－type filter tube diameter，m

dn－当量直径m，类管件过滤器取管件内径"D"，筒壳式过滤器取‘4s/c

dn－Equivalent diameter m ,The kind of fitting filter take the fitting inside diameter "D"，The tube shell type filter take‘4s/c’

S－液体流通面积，m²

S－Liquid flow area，m²

C－液体湿周（湿润周长），

C＝2X（筒体内径＋筒体高度）m C＝2X（筒体内径＋筒体高度）m

C－Liquid wetted perimeter(Moist perimeter)，

C＝2X（cylinder diameter + cylinder height）m

ξ-入口阻力系数，取1.1

ξ-Entrance friction coefficient,Taking1.1

ξ-出口阻力系数，取0.5

ξ-Export friction coefficient, Taking0.5

类管件过滤器公称直径与当量直管段长度关系

Category filter tube nominal diameter and length of straight pipe equivalent relations

a.对于‘Y 型’等管件类过滤器，按下式计算for the 'Y-type', such as tube-type filter,

determined using the following equation:

b.对于‘筒壳’类过滤器，按下式计算or the 'drum shell' type filters, determined using the

following equation:

过滤面积及孔目数Filtration area and Hole item of number

过滤面积通常指丝网的有效流通面积，可以查阅下表“滤网规格”得知有效面积，滤网总面积与有效面积率的乘积即为过滤面积（有效流通面积）。通常，考虑过滤面积按过滤器公称通径的20 倍设计，已足够满足使用场合。除非在非常见的特殊环境使用，才予以特殊考虑。

The filtration area usually refers to silk screen's effective flow area,May the consult next table “the mesh specification”knowing effective area,Mesh total area and active surface rate product namely for filtration area (effective flow area).Usually,The consideration filtration area according to the filter nominal size's 20 time of designs, enough has satisfied use situation. Only if in non- the common special environment use, only then gives the special consideration.

孔目数（目数/英寸）的选择，主要考虑需拦截的杂质粒径，依据介质流程工艺要求而定。各种规格丝网可拦截的粒径尺寸查下表“滤网规格”。

Hole Mesh (mesh / inch) of choice, consider the need to intercept the main impurities in diameter, according to media flow Process requirements. Various specifications of wire to intercept the particle size can search under the table "filter specifications."

Mesh specification

(1) 金属材料温度适用范围

Temperature scope of application of metallic materials

铸铁Cast iron－10～200℃碳钢Carbon steel－20～400℃低合金钢Low-alloy structural steel－40～400℃不锈钢Stainless steel－190～400℃

(2) 辅助密封材料温度适用范围

Auxiliary seal material temperature applicable scope

丁晴橡胶NBR－30～100℃氟橡胶fluoroelastomers－30～150℃

石棉板graphite ≤300℃石墨金属缠绕垫Metal wound pad≤650℃

公称压力：按照过滤管路可能出现的最高压力确定过滤器的压力等级，也可通过技术协议要求，考虑进出口管路的统一性，选择与出口管路中最高压力相匹配的压力等级过滤器.实际适用最高压力与介质湿度关系如下：

Nominal pressure: Inaccordance with the filter pipe maximum pressure that may arise to determine the pressure of grading filters can also pass Have