属于均速管流量范畴里面，它的基本结构是中间一根中空的金属管，在迎向流体流动的方向有钻有成对的测压孔，在现场使用的时候，阿牛巴流量计垂直于工艺管道轴线插入安装，当流体通过时，能起到标准孔板节流产生压差的效果。 Annubar flowmeter belongs to the category of uniform velocity tube flow. Its basic structure is a hollow metal tube in the middle. There are pairs of pressure measuring holes drilled in the direction facing the fluid flow. The Nubar flowmeter is inserted and installed perpendicular to the process pipeline axis, and when the fluid passes through, it can play the effect of standard orifice plate throttling to produce a pressure difference.
The characteristics of Annubar flowmeters are different from other pipeline flowmeters: 1. Simple installation. The installation of Annubar flowmeters is very simple, as long as a small hole is made in the process pipeline, the joint body is welded, then the flowmeter is inserted and screwed It can be crushed 2. It can be disassembled and installed without stopping production. This feature is not available in other pipeline flowmeters. Annubar flowmeters are removed and installed without stopping the process system, which greatly reduces the number of instrument maintenance personnel. Workload. 在现场安装的时候前后直管段要求仅为标准孔板等节流装置的1/3，大大减少了现场工艺管道的投资4.节能效果显著经测定，阿牛巴流量计的压力损失很小，在同等情况下，仅为标准孔板等节流装置的5%以下，所以采用阿牛巴流量计大大减少了动力消耗，有着显著的节能效果除了上述特点还具有适用范围宽，长期稳定性较好，减少维护量，价格低廉等优点 3. Low length of straight pipe section Annubar flowmeter requires only one third of the front and rear throttling devices when installed on site, which greatly reduces the investment in process pipelines on site. 4. Significant energy-saving effects have been measured. The pressure loss of Annubar flowmeter is very small. In the same situation, it is only less than 5% of throttling devices such as standard orifice plates. Therefore, using Annubar flowmeter greatly reduces power consumption and has significant energy saving effects. The above features also have the advantages of wide application range, good long-term stability, reduced maintenance, and low price.
Issues needing attention when using Annubar flowmeter
的机械尺寸必须根据需要安装的管道尺寸量身定做，在用户提供的参数必须包括管道外径、壁厚、常用流量等相关参数，在阿牛巴的制造过程中流量测量范围的标定是完全根据用户提供的数据计算设定的。 1. The mechanical size of Annubar flowmeter must be tailored according to the size of the pipeline to be installed. The parameters provided by the user must include relevant parameters such as the outer diameter of the pipe, wall thickness, common flow rate, etc. The flow rate during the manufacturing process of Annubar The calibration of the measurement range is completely calculated and set based on the data provided by the user. Therefore, if the flow data and pipe size are provided based on experience and impression, it will cause a large measurement error. 2. The differential pressure signal generated by the differential pressure averaging tube flowmeter is generally small, the minimum is only 20 ~ 30pa. The magnitude of the differential pressure signal generated by the averaging tube flowmeter is closely related to the Reynolds coefficient of the fluid condition. For differential pressure measurement of less than 1kpa, especially differential pressure of less than 0.5kpa, it is a test of the performance of the transmitter. Under these low flow conditions, the k fluctuation of various averaging tube flowmeters is very large, which affects the measurement accuracy. 3. After the differential pressure signal is collected, try not to use the impulse tube to improve the signal-to-noise ratio of the differential pressure signal transmission and reduce leakage. We use Annubar, three-valve manifold and differential pressure transmitter to directly install the integrated method to completely eliminate the pressure piping, sewage valve and mounting bracket and other equipment. In this way, not only problems such as leakage caused by the use of impulse pipelines, distortion of differential pressure signals, etc., but also cost and accuracy are improved.