The invention relates to a concave-arc double-flow equalizing tube flowmeter, which comprises a detection rod inserted into the measuring pipeline along the diameter, a total pressure pipe and a static pressure pipe arranged in the detection rod. The total pressure pipe is located on the upstream side, and the static pressure pipe is located on the backstream side. The upstream and the back flow surfaces of the detection rod are provided with total pressure holes and static pressure holes. All the total pressure holes are connected with the main pressure pipe, and the average pressure pipe is drawn out from the main pressure pipe. Total pressure p; All the static pressure holes are connected with the static pressure pipe, and static pressure P is drawn from the static pressure pipe; The average velocity of flow on the pipe section is obtained by using the difference between the measured total pressure P and static pressure P. The characteristic is that the cross section shape of the detection rod is similar to that of a rhombus, with concave arcs on all sides, convex arcs on both the upstream and backstream surfaces, and streamline at the junction of concave arcs. The invention can effectively improve the output differential pressure of the average speed tube flowmeter and the accuracy of the low flow measurement of the average speed tube.
【技术实现步骤摘要】
一种凹弧形双流向均速管流量计
本专利技术涉及均速管流量计。
技术介绍
作为插入式流量仪表之一的均速管流量计(国外称Annubar、Verabar、Probar等)是60年代后期基于皮托管测速原理发展起来的一种差压式流量计。与传统流量传感器比,均速管流量计因其结构简单、安装拆卸方便、压力损失小、成本低的优势广泛应用于电力、冶金、石化等行业大口径管道的流量测量中。它具有以下诸多优点:(1)应用范围广。均速管流量计可用于不含固体颗粒的所有流体的流量测量;适用的管道直径范围较宽,最小直径可达25mm,最大直径可达9m;可以测量不规则管道(如方形或矩形管道)的流量。(2)均速管流量计结构简单、重量轻,安装、拆卸、维修方便,可实现不断流拆装,制造成本低。(3)压力损失小、节能。均速管流量计的不可恢复压力损失仅占其输出差压的2~15%,仅为孔板的5%以下,明显减少了动力消耗,节能效果显著。(4)准确度长期稳定性好。均速管流量计没有可动及易磨损部件,当管径大于300mm时,其准确度能达到±1%,稳定性为±0.1%,一般满足实用的要求。均速管流量计是插入式差压流量传感器,其检测杆横 ...
【技术保护点】
1.一种凹弧形双流向均速管流量计,包括沿直径插入测量管道中的检测杆、设置在检测杆内的总压管和静压管,总压管位于迎流面,静压管位于背流面,在检测杆的迎流面和背流面设置有总压孔和静压孔,所有的总压孔与总压管相连通,从总压管引出平均总压p;所有的静压孔与静压管相通,从静压管引出静压p;利用测得的总压p与静压p之差获取管道截面上平均流速的大小,其特征在于,检测杆的截面形状类似菱形,四边均为凹弧形,迎流面和背流面均为凸弧形,凹弧形的边相接之处为流线型。
【技术特征摘要】
1.一种凹弧形双流向均速管流量计,包括沿直径插入测量管道中的检测杆、设置在检测杆内的总压管和静压管,总压管位于迎流面,静压管位于背流面,在检测杆的迎流面和背流面设置有总压孔和静压孔,所有的总压孔与总压管相连通,从总压管引出平均总压p;所有的静压孔与静压管相通,从静压管引出静压p;利用测得的总压p与静压p之差获取管道截面上平均流速的大小,其特征在于,检测杆的截面形状类似菱形,四边均为凹弧形,...
【专利技术属性】
技术研发人员:张涛,张景丽,陈增辉,
申请(专利权)人:天津市天大泰和自控仪表技术有限公司,
类型:发明
国别省市:天津,12
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