新型差压流量计的结构与性能研究  

Study on the Structure and Performance of New Differential Pressure Flowmeters

作　　者：纪波峰 纪纲 JI Bofeng;JI Gang(Shanghai Tongxin Automatic Meter Co.,Ltd.,Shanghai 200070,China)

机构地区：[1]上海同欣自动化仪表有限公司,上海200070

出　　处：《自动化仪表》2019年第4期77-81,共5页Process Automation Instrumentation

摘　　要：尽管流量计种类多样,但由于被测流体的复杂性、要求的多样性和使用条件的特殊性,直到现在仍有很多流量测量任务未能达得到满意的效果。因此,开发新型的流量计或改进现有的产品仍势在必行。介绍了四种新型差压流量计。其中,双量程差压流量计采用增设低量程差压变送器的方法,提升量程低端的差压测量准确度,从而提高量程低端流量测量准确度、扩大量程比。双向孔板流量计采用孔板不削斜角等方法,实现双向流量测量。湿气体流量计采用偏心孔板和弃用针形阀三阀组等方法,消除积液带来的误差。耐腐蚀弯管流量计采用新型氟塑料喷涂的方法,提高耐腐蚀能力,并用吹气和弯管管外伴热保温的方法防止介质的结晶和自聚,从而增强系统的可靠性和延长使用寿命。Although there are more than one hundred kinds of flow meters,due to the complexity of the fluid,the diversity of requirements and the particularity of the conditions of use,many flow measurement tasks have not yet achieved satisfactory results.For this purpose,researchers are working hard to develop new flow meters or to improve existing products.Four new differential pressure flow meters described in this paper,adding a low-range differential pressure transmitter in the dual-range differential pressure flowmeter to improve the differential pressure measurement accuracy in the low range,thereby improving the accuracy of the low-range flow measurement and expanding the turndown ratio.The two-way orifice flowmeter is a two-way flow measurement by using a plate without cutting the bevel.The wet gas flowmeter uses a method such as an eccentric orifice plate and a disposable needle valve three-valve to eliminate the error caused by the liquid accumulation.Corrosion-resistant elbow flowmeter use new fluoroplastic coating method to improve corrosion resistance,and prevent crystallization and self-polymerization of medium by blowing air and heat insulation outside the pipe,thereby enhancing system reliability and prolonging service life.

关 键 词：新型流量计 双量程流量计 双向孔板流量计 湿气体流量计 耐腐蚀 介质结晶 自聚 

分 类 号：TH81[机械工程—仪器科学与技术]