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Temperature sensing medium for all-liquid type temperature meter and filling method thereof

A thermometer and medium technology, applied in thermometers, thermometers based on material expansion/contraction, measuring devices, etc., can solve the problems of low flash point, chronic leakage, corrosion of parts, etc., and achieve non-volatile and good stability. Effect

Active Publication Date: 2012-03-28
杭州华立仪表股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, xylene is a moderately toxic liquid. Using it as a temperature-sensing liquid has a corrosive effect on parts and directly affects the service life of the instrument. Because of its toxicity, it is obviously not suitable in today's society that pays attention to green environmental protection.
As jet fuel is volatile, low flash point, flammable liquid, if it is used as a temperature sensing medium, the requirements for the temperature measurement system with a full liquid thermometer will be very high, resulting in serious chronic leakage, which directly affects the performance of the instrument. work reliability

Method used

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  • Temperature sensing medium for all-liquid type temperature meter and filling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add a mixture of octamethylcyclotetrasiloxane (D4) and hexamethyldisiloxane (MM) at a molar ratio of 1:1, add 3% concentrated sulfuric acid of the total mass of the material as a catalyst, and heat at 30°C After stirring for 3 hours, add distilled water and stir for 30 minutes, raise the temperature to 65°C, continue stirring for 30 minutes, keep the layers, take the oil layer, neutralize the residual sulfuric acid with 6% sodium carbonate aqueous solution, wash with water until neutral, and filter Remove low boilers, decolorize with activated carbon after cooling, and obtain colorless and transparent liquid silicone oil. The amount of activated carbon added is 3% of the total mass of the oil layer.

Embodiment 2

[0020] Add a mixture of octamethylcyclotetrasiloxane (D4) and hexamethyldisiloxane (MM) at a molar ratio of 1:2, and add concentrated sulfuric acid with 5% of the total mass of the material as a catalyst. After stirring for 3 hours, add distilled water and stir for 30 minutes, raise the temperature to 70°C and continue to stir for 30 minutes, then separate the layers, take the oil layer, neutralize the residual sulfuric acid with 5% sodium carbonate aqueous solution, wash with water until neutral, and filter Remove low boilers, decolorize with activated carbon after cooling, and obtain colorless and transparent liquid silicone oil. The amount of activated carbon added is 2% of the total mass of the oil layer.

Embodiment 3

[0022] Add a mixture of octamethylcyclotetrasiloxane (D4) and hexamethyldisiloxane (MM) at a molar ratio of 1:1, and add concentrated sulfuric acid with 4% of the total mass of the material as a catalyst. After stirring for 3 hours, add distilled water and stir for 30 minutes, raise the temperature to 70°C and continue to stir for 30 minutes, then separate the layers, take the oil layer, neutralize the residual sulfuric acid with 5% sodium carbonate aqueous solution, wash with water until neutral, and filter Remove low boilers, decolorize with activated carbon after cooling, and obtain colorless and transparent liquid silicone oil. The amount of activated carbon added is 2% of the total mass of the oil layer.

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Abstract

The invention relates to a temperature sensing medium, in particular to a temperature sensing medium for an all-liquid type temperature meter used for measuring oil surface temperature and winding temperature on large and medium transformers, belonging to the technical field of organic polymers. The temperature sensing medium for the all-liquid type temperature meter is MDnM silicone oil. Preferably, the temperature sensing medium is dimethyl silicon oil. By using silicone oil to replace dimethylbenzene and jet fuel, the temperature sensing medium for the all-liquid type temperature meter hasthe advantages of no taste, no color and no toxin; the flashing point is high (more than 120 DEG C), 25 DEG C for dimethylbenzene, and 38 DEG C for jet fuel; and the temperature sensing medium is noteasy to volatilize, has good stability and can overcome the defects of the original temperature sensing liquid. Through detection, the accuracy of the all-liquid type temperature meter using the dimethyl silicon oil as the temperature sensing medium can reach 1.0 grade, the time constant is smaller than 20 s, and the temperature measurement range can reach -40 to 300 DEG C.

Description

technical field [0001] The invention belongs to the technical field of organic macromolecules, and relates to a temperature-sensing medium, in particular to a temperature-sensing medium of a full-liquid thermometer used for measuring oil surface temperature and winding temperature of large and medium-sized transformers. Background technique [0002] It is a full-liquid thermometer for measuring oil surface temperature and winding temperature on large and medium-sized transformers. Its temperature measurement principle is to fill its closed temperature measurement system with a temperature-sensitive liquid. When the temperature rises or falls, the thermal expansion of the liquid is used. The principle of cold shrinkage measures temperature. At present, the temperature-sensitive liquids used in the production of full liquid thermometers are xylene and jet fuel. However, xylene is a moderately toxic liquid. Using it as a temperature-sensing liquid will corrode parts and direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K5/12G01K5/02
Inventor 陈绍禹
Owner 杭州华立仪表股份有限公司
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