Gallium liquid metal material and its application in remote pressure and differential pressure transmitters

Abstract

The invention discloses application of a gallium liquid metal material to a teletransmission pressure and different pressure transmitter. The pressure and different pressure transmitter is provided with a capillary tube filled with a liquid medium, and the whole or part of the capillary tube is filled with the gallium liquid metal material. According to parameter requirements of the gallium liquid metal material, the heat conductivity is larger than 10 W / m*k, the kinematic viscosity is (5*10-8-9*10-8) m<2> / s, the melting point is lower than 15 DEG C, and the boiling point is larger than 1000 DEG C. The gallium liquid metal material is gallium liquid metal or gallium-based liquid alloy metal. The application has the beneficial effects that the gallium liquid metal material with the very high nominal melting point is used on the pressure and different pressure transmitter, the gallium liquid metal material is not liable to be vaporized even the nominal high-temperature boundary point is approached, the gallium liquid metal material still has very good fluidity, the performance cannot be affected, and sensitivity and precision of a measuring instrument are maintained. The highest use temperature of the gallium liquid metal material can be 1200 DEG C or higher, and the gallium liquid metal material can also be used on high-temperature and negative-pressure occasions.

Description

Technical field [0001] The invention relates to the relevant technical field of pressure and differential pressure transmitters, in particular to a gallium liquid metal material and its application to remote pressure and differential pressure transmitters. Background technique [0002] At present, in the remote transmission pressure and differential pressure transmitters, the remote transmission module and the filling fluid in the capillary tube are mostly organic liquid media such as silicone oil, fluorine oil, and vegetable oil. When measuring the pressure of high-temperature media, select high-viscosity resistant High temperature silicone oil, high temperature resistant silicone oil has a very high viscosity (333-368mm 2 / s), it will cause a large loss in the pressure transmission performance of the transmitter. At the same time, high-temperature silicone oil is used at full load under the nominal melting point, and it is easy to vaporize in the capillary, which further affects...

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Problems solved by technology

[0002] At present, on the remote pressure and differential pressure transmitters, most of the filling fluids in the remote module and the capillary are organic liquid media such as silicone oil, fluorine oil, and vegetable oil. When measuring the pressure of high-temperature media, high-viscosity resistant High temperature silicone oil, high temperature silicone oil viscosity is very high (333-368mm 2 / s), it will cause a large loss in the pressure transmission performance of the transmitter. At the same time, the high-temperature silicone oil is used at full load under the nominal melting point, and it is easy to gasify in the capillary, which further affects the pressure transmission, because this characteristic cannot be used. In the measurement environment of high temperature and negative pressure; use low viscosity silicone oil, 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 liquid in the cavity will be vaporized instantly, and the volume expansion will be 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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