旋进旋涡流量计取压方式对检定结果的影响及改进措施

为了了解表体取压孔取压和管道取压孔取压两种取压方式对旋进旋涡流量计检定结果的影响，比较了不同口径、不同生产厂家的旋进旋涡流量计在两种取压方式下的流量计相对误差，分析了不同流量点下的误差关系。结果表明：①旋进旋涡流量计型号一定的情况下，用表体取压孔取压方式检定流量计时流量计的线性度较好，用管道取压孔取压方式检定流量计时流量计的线性度较差；②流量测点相同的情况下，表体取压孔取压检定方式的流量计误差较小，管道取压孔取压检定方式的流量计误差较大；③两种取压方式引起的误差随着流量的增大而逐渐增大，在流量为2 900 m3/h时两者相差近6.2%，远远超出了流量计的准确度等级，因此，在旋进旋涡流量计的检定过程中，应避免在流量计表体取压孔以外的地方取压进行检定。同时还提出了避免旋进旋涡流量计取压孔堵塞的改进措施：改进流量计结构、安装过滤装置、涂抹润滑油和设置取压无效报警。

Impact of the pressure measurement methods of a swirlmeter on its calibration results and the improvement measures

In order to know how the pressure measurement methods through the bores of a meter body and the adjacent piping respectively affect the calibration results of a swirlmeter,this paper compares the relative errors of the swirlmeters with different diameters and different types(made by different manufacturers)under the above said two pressure measurement methods.A comparative analysis of the relative error curves show that(1)under the same condition of a certain type of swirlmeters,the flow meter with the pres...