的测量原理饱和蒸汽流量测量在80年代人们普遍采用标准孔板流量计，但从流量仪表发展状况来看，孔板流量计尽管其历史悠久、应用范围广；人们对它的研究也最充分，试验数据最完善，但用标准孔板流量计来测量饱和蒸汽流量，它仍存在一些不足之处：其一，压力损失较大；其二，导压管、三组间及连接接头容易泄漏；其三，量程范围小，一般为3比1，对流量波动较大易造成测量值偏低。 Vortex flowmeter measurement principle Saturated steam flow measurement. In the 1980s, standard orifice flowmeters were widely used. However, from the perspective of the development of flow meters, orifice flowmeters have a long history and a wide range of applications; people have researched it. It is also the most complete and has the most complete test data. However, there are still some shortcomings when using a standard orifice plate flowmeter to measure the saturated steam flow: one is the large pressure loss; the other is the impulse tube, the three groups and the connection The connector is easy to leak. Third, the measuring range is small, generally 3 to 1, and the measurement fluctuation is easy to cause the measured value to be low. The vortex flowmeter has a simple structure, and the vortex transmitter is directly installed on the pipeline, which overcomes the phenomenon of pipeline leakage. In addition, the vortex flowmeter has a small pressure loss and a wide measuring range, and the measuring range ratio of saturated steam can reach 30 to 1. Therefore, with the maturity of vortex flowmeter measurement technology, the use of vortex flowmeters has become more and more popular.
常见故障九、 一台DN50涡街流量计，从说明书查到，其液体用流量范围是3-50m3/h。 Common faults of vortex flowmeter Common faults of vortex flowmeter Nine, a DN50 vortex flowmeter, from the instruction manual, its liquid flow range is 3-50m3 / h. The result of our calibration on the oil flow standard device is that 10-50 m3 / h meets the accuracy requirements, but the accuracy below 10m3 / h is unqualified. How should we evaluate this flow meter? In the vortex flow juice manual, the flow range indicated is The flow range used for a specific reference medium, like liquid-refers to room temperature water. When used with other media, the available flow range will vary depending on the viscosity and density of the media. Because the oil flow standard device uses diesel with a viscosity greater than water and a density lower than water as the calibration medium, the lower limit flow of the flow meter will generally increase accordingly, narrowing the available flow range. Therefore, it is normal for the vortex flowmeter to have a small flow performance degradation on the oil flow calibration device. It is not difficult to infer from this that if liquefied petroleum gas (such a low viscosity medium) is used to calibrate the vortex flow juice, the opposite result will be obtained better than water.
是采用取压孔或插入式检测元件感应漩涡，一旦介质中杂质嵌入取压孔或感应元件与表体间的缝隙，则造成信号变弱或不稳定。 What is a vortex flowmeter that meets the needs of the field 1. Low maintenance-most vortex flowmeters on the market use pressure holes or plug-in detection elements to sense the vortex. Once impurities in the medium are embedded in the pressure holes or the sensor element and The gap between the surface of the body causes the signal to become weak or unstable. Good design should have no easily clogged parts, thus reducing maintenance. 2. On-line replacement of sensing elements-some manufacturers' sensing elements and vortex generators are combined into one, and the seemingly simple design brings inconvenience to actual use. Because once the sensing part fails, the medium in the pipeline needs to be evacuated and pressure-replaced to replace components, which affects production. The perfect design should be to separate the two, so that the sensing part can be replaced separately without the need to empty the media. 3. Vortex flowmeters are susceptible to vibration interference. Well-designed vortex flowmeters can eliminate interference through hardware and digital signal processing to obtain stable signals. 4. A major trouble for the installation of vortex flowmeters is that long straight pipe sections are needed before and after. Some manufacturers can provide a design to reduce the diameter inside the flowmeter, which greatly reduces the user's need for special vortex flowmeters equipped with straight pipe sections.