Mercury-free glass thermometer and production method thereof

Abstract

The invention belongs to the field of medical glass thermometers, in particular to a mercury-free glass thermometer and a production method thereof. The mercury-free glass thermometer comprises a thermometer tube body and a temperature sensing bulb, and further comprises a glass capillary tube with one end connected with the temperature sensing bulb and a necking-down structure arranged at one end of the glass capillary tube. The necking-down structure comprises a stationary point protrusion and a temperature sensing liquid flow channel. Temperature sensing liquid contained in the temperature sensing bulb is further included. The temperature sensing liquid is made of gallium-base alloy. The adopted gallium-base alloy comprises gallium, indium, stannum, zinc, bismuth, antimony, lead, and one or two of rare earth metals of lanthanum, cerium and neodymium. According to the mercury-free glass thermometer and the production method thereof, the gallium-base alloy is used for replacing traditional mercury. The production process and the gallium-based alloy and the manufacturing method of the thermometer are improved, and the produced thermometer accords with an international medical instrument standard, and is environmentally friendly and excellent in performance.

Description

technical field [0001] The invention belongs to the field of medical glass thermometers, in particular to a mercury-free glass thermometer and a production method. Background technique [0002] The thermometer is an important basic medical device used to measure body temperature to evaluate the health status of the body, so it is widely used by people and has a great market demand. However, traditional thermometers use mercury as a temperature-sensing liquid to make mercury thermometers. Because mercury is highly toxic, exposure to the environment is extremely harmful to human health. European countries have already banned the production and use of mercury thermometers, and my country has also clearly stipulated that the production of mercury thermometers will be banned in 2016. At present, a variety of electronic thermometers have been developed on the market to replace mercury thermometers. Due to the large differences in the performance of electronic components of elec...

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Problems solved by technology

However, the content of metal indium, cesium and rubidium in the alloy is relatively high, and the price is expensive, which increases the cost of the alloy

At the same time, this patent also proposes to use a certain concentration of hydrochloric acid alcohol solution as a protective solution to remove alloy oxides, but it can only protect the surface of the liquid alloy in a short period of time and is silvery white, and because dilute hydrochloric acid can dissolve part of the alloy elements The alloy components are destroyed, which affects the stability of the alloy components; at the same time, new substances are introduced into the alloy, including: water and alcohol; in addition, the remaining hydrochloric acid and related salts are mixed in the alloy. Difficult to remove, it may increase the melting point of the gallium-based alloy, increase the sediment and deteriorate the stability, and also greatly increase the extremely cumbersome purification process of the temperature-sensing liquid before filling the thermometer, resulting in a significant extension of the entire production time of the thermometer , the production efficiency is reduced, which also makes the quality and yield of the thermometer lower

[0004] Patent 200610024617.2 uses a liquid low-melting gallium-indium-tin-potassium-sodium alloy that is stable in the range of 5°C to 42°C as the temperature-sensing liquid for thermometers, but the sodium-potassium alloy has relatively high activity and high risk, so it needs to be in an inert gas Use and store under protection

[0005] Both patent 031012638.3 and patent 201210209297.3 propose that the temperature-sensing liquid of the thermometer is a gallium-indium-tin-zinc alloy, but neither involves the purification of the liquid gallium alloy

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