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'空压机差压式流量计的节流道理和使用方式'

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'2019-05-13 10:19:51'

'2019-05-13 10:19:51'

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'<p>复盛空压机的差压式流量计，是应用节流道理，即应用流体流经节流装配时发生的压力差来实现流量丈量的。它是由节流装配、导压管和差压计构成。</p><p>节流装配有孔板、喷嘴和文丘里管等情势。</p><p>节流装配的中间有一孔径比管径小的圆孔，当流体经由过程直管入进节流装配时，因管的截面积忽然减小，流体的部门压力改变成为动能。</p><p>使节流装配收缩截面内的介质均匀流速急剧增年夜，在该截面内的静压力变得小于节流装配前的静压力，借助于导压管和差压计丈量出压力差的变化值，以此计算出管道内所经由过程的被测介质的流量。</p><p>节流装配可以程度、垂直或倾斜安装在管道上，但必需是不变径的直管，且 被测介质布满全管。</p><p>安装处前后2D范畴内的管道内外貌应平滑，无显著凹凸征象。</p><p>其内径误差应切合:当(%)*&lt;0.55时，当()*&gt;0.55时，为土0.005D;为土0.02D (d 为节流件镗孔内径，D为管道内径)。</p><p>安装前应找准安装标的目的，孔板锐边部小口应迎着介质活动标的目的。</p><p>为避免经由过程节流装配的流束受涡流影响，节流装配的前后均要求具有必定长度的直管段。</p><p style="text-align: center;"><img alt="空压机差压计" src="2018/1228/1010.jpg" /></p><p>安装时，先在管路安装位 置按要求长度用气焊切割往一段，并用手提砂轮或锉刀将管口打出坡口，经检讨管径及管内壁外貌粗拙度均切合设计要求后，即可在管口焊接法兰。</p><p>所焊法兰应垂直于管道轴心，法兰中央线和管道中央线应一致。焊后清算清洁后，将孔板装到两法兰之间。</p><p>孔板中央线和管道中央线必需一致，答应误差为管道直径的1%; 孔板两侧的垫片内径不得小于管内径。</p><p>节流装配前后引出口，一般在出厂前已钻好。</p><p>若需用户加工时，钻孔应垂直于管内介质的流速标的目的，当管道内径&lt;100mm时，可钻$6mm的孔; 当管道内径&gt;100mm时，可钻8~10mm的孔。</p><p>当丈量液体介质时，节流装配的前后压力引出口应从管道下半部45&rdquo;角的标的目的引出，差压计较好装在被测管道的下方。</p><p>必需装在管道上方时应在导压管的较高点设置分气器，以网络并排除入进导压管中的气体;</p><p>当丈量气体介质时，应从管道的上部引出取压管，差压计较好布置在 管道的上方，必需设置在管道下方时应设置分液器，以免液体入进差压计内。</p><p>丈量燕气流量时，必需在导压管上部设置寒凝器。</p><p>为便于维修，在接近管道压力引出口处的导管上应安装阀门，事情压力小于0.98MPa时,可采取通俗阀门; 压力较高时，应选用针形阀门。</p><p>在导压管结尾也应安装阀门，以便于冲刷或放空。</p><p>差压计应安装在便于察看、无振动和机器毁伤处，其环境温度不宜低于10~60C,从取压点赴任压计的间隔，不得小于3m 和年夜于50m。</p>'

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'空压机差压式流量计的节流道理和使用方式_知识百科_技术中心_复盛空压机(华北)总代理'

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