Novel transmissible pressure and differential pressure transmitter for measuring pressure of ultrahigh temperature medium

Abstract

The invention discloses a novel transmissible pressure and differential pressure transmitter for measuring pressure of an ultrahigh temperature medium. A measuring diaphragm and an isolating diaphragm are respectively welded on the outer end faces of a connecting flange and an isolating flange, a radiating tube is welded between the connecting flange and the isolating flange, and then ultrahigh temperature resistant high-viscosity high-temperature tube filling liquid is injected to form an ultrahigh temperature tube filling liquid cavity; and a matching flange is welded on the other end of the isolating flange to connect a stainless steel capillary tube and the pressure and differential pressure transmitter, and low-viscosity high-temperature tube filling liquid is injected to form a normal high-temperature tube filling liquid cavity. In the working process, the pressure of the ultrahigh temperature medium is transmitted to the isolating diaphragm through the ultrahigh temperature resistant high-viscosity high-temperature tube filling liquid, and then transmitted to the main body of the pressure and differential pressure transmitter through the low-viscosity high-temperature tube filling liquid in the stainless steel capillary so that the pressure transmission and measurement are realized. By means of high temperature isolation and radiation, the ultrahigh temperature is not directly transmitted to the low-viscosity high-temperature tube filling liquid so as to protect the high-temperature transmissible pressure and differential pressure transmitter and realize the pressure measurement of the ultrahigh temperature medium.

Description

Technical field [0001] The invention relates to a novel remote pressure and differential pressure transmitter, which is suitable for the measurement of ultra-high temperature media above 400°C and can be widely used in chemical industry, electric power, petroleum, metallurgy and other industrial fields. Background technique [0002] At present, in the pressure and differential pressure transmitter industry, the known remote pressure and differential pressure transmitters for measuring the pressure of high-temperature media are composed of diaphragm boxes with measuring diaphragms, stainless steel capillary tubes, high-viscosity high-temperature filling fluids or low-viscosity high-temperature Filling fluid and pressure, differential pressure transmitter body. When measuring the pressure of high-temperature medium, high-viscosity high-temperature filling liquid is selected. This filling liquid has a high boiling point, but the fluidity of the liquid is poor, which affects the...

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Problems solved by technology

When measuring the pressure of high-temperature medium, high-viscosity high-temperature filling liquid is selected. This filling liquid has a high boiling point, but the fluidity of the liquid is poor, which affects the transmission speed of the pressure in the stainless steel capillary, resulting in the reaction of remote pressure and differential pressure transmitters. Slow, long response time; choose low viscosity high temperature filling fluid, although its fluidity is good, but its boiling point is low, when the medium temperature is higher than its boiling point, the high temperature filling fluid in the cavity will be vaporized instantly, and the volume expansion will be directly Causes the measuring diaphragm to bulge and is permanently irreversible, resulting in functional damage

This kind of remote pressure and differential pressure transmitter is affected by the characteristics of the high-temperature filling fluid, so it does not have the ability to measure the pressure of ultra-high temperature media above 400 °C

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