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大量程压力变送器受受压范围是多少?

作者: 来源: 日期:2018-9-28 10:46:29 人气:127

压力变送器是工业实践中最为常用的一种压力仪表,其广泛应用于各种工业自控环境,涉及水利水电、铁路交通、智能建筑、生产自控、航空航天、军工、石化、油井、电力、船舶、机床、管道等众多行业。一般大量程压力变送器(测量范围0-r50MPa)、螺纹连接安装型压力变送器,能精确测量流体的压力,并把它转换成DC4- 20mA的输出信号。在检测部内,输入压力被转化为静电电容,在传输部对与压力成正比的检测信号进行放大运算,发送输出DC4-2OmA的电流信号。

 大量程压力变送器受受压范围是多少?昆山丹瑞

2、整体结构和受力分析         

大量程压力变送器的机械部总组件结构如图2所示。

大量程压力变送器受受压范围是多少?-昆山丹瑞

压力变送器与现场压力管道通过连接管采用NPT1/2圆锥管螺纹密封连接,正常工作时被测流体充满连接管,管内部压力为流体工作压力,流体压力通过密封膜片一和变送器内部填充介质进行传递,大气压力通过密封膜片二和变送器内部填充介质进行传递,因此压力钱汇娱乐高压侧和连接管内部承受的压力为流体工作压力,压力钱汇娱乐低压侧承受的压力为大气压力。     

所以大量程压力变送器正常工作时,其机械部总组件的连接管壁和焊缝是受压部位中最为薄弱的环节。如果管壁设计较薄、焊缝熔深太浅,将使管壁、焊缝破裂导致被测流体或填充介质泄露。由于低压侧大气压力1.01X105Pa,约为高压侧工作压力50M Pa的11500,受压非常小,不再计算低压侧部位的强度。一般情况下,大量程压力变送器内部填充介质和被测液体无强腐蚀性,所处温度变化范围较小(范围在一150C-85"C)。

Pressure transmitter is the most commonly used pressure instrument in industrial practice, which is widely used in various industrial automatic control environment, involving water conservancy and hydropower, railway transportation, intelligent building, production automation, aerospace, military, petrochemical, oil wells, power, ships, machine tools, pipelines and many other industries. Generally large-range (measuring range 0-r50MPa), threaded connection mounted pressure transmitter, can accurately measure fluid pressure, and convert it into DC4-20mA output signal. In the detection unit, the input pressure is converted into an electrostatic capacitor. In the transmission unit, the detection signal proportional to the pressure is amplified and the current signal of the output DC4-2OmA is transmitted.

2, the overall structure and stress analysis

The overall structure of the mechanical part of the large range pressure transmitter is shown in Figure 2.

The pressure transmitter and the field pressure pipeline are connected by the NPT1/2 conical pipe thread sealing. The fluid under test is filled with the connecting pipe during normal operation. The inner pressure of the pipe is the working pressure of the fluid. The fluid pressure is transmitted through the sealing diaphragm-1 and the filling medium inside the transmitter. The atmospheric pressure is transmitted through the sealing diaphragm-2 and the transmission. The pressure on the high-pressure side of the pressure sensor and the inner part of the connecting pipe is the fluid working pressure, and the pressure on the low-pressure side of the pressure sensor is the atmospheric pressure.

Therefore, when a large range pressure transmitter works normally, the connecting pipe wall and weld of its mechanical assembly are the weakest links in the pressure part. If the pipe wall is thinner and the weld penetration is too shallow, the pipe wall and weld will break down and lead to the leakage of the fluid or filling medium under test. Since the atmospheric pressure on the low side is 1.01X105Pa, which is about 1,1500 MPa of the working pressure on the high side, the pressure is very small, and the strength of the low side is no longer calculated. Generally speaking, the packed medium and the tested liquid in the large range pressure transmitter are not strongly corrosive, and the temperature range is small (ranging from 1 150 C to 85 "C").

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