Production method of glass thermometer without vacuum blowing processing

A production method and technology of thermometers, applied in thermometers, thermometers based on expansion/contraction of materials, measuring devices, etc., can solve problems such as pollution, and achieve the steps of avoiding mercury evaporation pollution, reducing rising vacuum and detecting stress, and solving mercury Effects of evaporative pollution problems

Active Publication Date: 2012-04-25
东阿阿华医疗科技有限公司
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Problems solved by technology

[0006] The invention provides a production method of a glass thermometer without vacuum expansion, which greatly improves the production process of the glass thermometer, especially the mercury injection step, and replaces the traditional vacuum expansion and stress detection with the technical means of refilling and capping. and other means, effectively prevent the glass tube from bursting, solve the problem of mercury evaporation pollution in the traditional production process when the vacuum is increased, and improve the yield and work efficiency of the production of glass thermometers

Method used

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  • Production method of glass thermometer without vacuum blowing processing
  • Production method of glass thermometer without vacuum blowing processing

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Step 1: Put the semi-finished thermometer tube material that has been shrinked into a tray, and perform high-temperature aging at 480°C, and keep the temperature at 480°C for 7 hours.

[0021] Step 2: Take out the tube material of the thermometer, and cool the tube material naturally to 30-40°C.

[0022] Step 3: Use a mechanical pump and a diffusion pump to evacuate the airtight chamber for 8 hours, and the vacuum degree is 2×10 -2 Pa. After reaching the required vacuum degree, liquid nitrogen was poured into the vacuum chamber for cooling treatment, and the temperature in the vacuum chamber was stabilized at 37°C. Then put the pipe material into the vacuum chamber for mercury injection, and the flow rate of mercury injection is required to be 10min / 70kg.

[0023] Step 4: The thermometer tubing after mercury injection is soaked in a constant temperature water tank with a temperature of about 42.25°C to raise the temperature. The allowable error of the water temperatur...

Embodiment 2

[0029] Step 1: Put the semi-finished thermometer tube material that has been shrunk into a tray for high-temperature aging at 440°C, and keep the temperature at 440°C for 6 hours.

[0030] Step 2: Take out the tube material of the thermometer, and cool the tube material naturally to 30-40°C.

[0031] Step 3: Use a mechanical pump and a diffusion pump to evacuate the airtight chamber for 8 hours, and the vacuum degree is 2.3×10 -2 Pa. After reaching the required vacuum degree, pour liquid nitrogen into the vacuum chamber for about 10 minutes for cooling treatment, and the temperature in the vacuum chamber is stabilized below 38°C. Then put the pipe material into the vacuum chamber for mercury injection, and the flow rate of mercury injection is required to be 30min / 70kg.

[0032] Step 4: The thermometer tubing after mercury injection is soaked in a constant temperature water tank with a temperature of about 42.25°C to raise the temperature. The allowable error of the water te...

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Abstract

The invention relates to a production method of a glass thermometer without vacuum blowing processing. The method comprises the following steps: carrying out high temperature aging for 7 hours on thermometer pipe material whose contraction throat operation is completed, taking the pipe material out and carrying out natural cooling on the pipe material to 30-40 DEG C, placing the pipe material into a vacuum cabin for mercury injection, after mercury injection, dipping the pipe material into water with a constant temperature of about 42.25 DEG C, heating one end of the pipe material to enable amercury column to heat up and overflow, fusing an open end of the pipe material and carrying out capping processing, and selecting a thermometer with overflow length of 98-103 cm and pipe material length of 110-115 cm for carrying out subsequent processing. By employing the method provided in the invention, a production flow of the thermometer is optimized, production efficiency is raised, manpower cost is reduced, mercury evaporation pollution caused by a traditional production method is avoided, and health and security of operation personnel are ensured.

Description

technical field [0001] The invention relates to a production method of a glass thermometer, in particular to a production method of a glass thermometer without vacuum expansion. Background technique [0002] At present, the vast majority of domestic medical thermometers use traditional glass mercury thermometers. Glass mercury thermometers have the advantages of accurate and reliable temperature measurement, simple operation, and low price. However, the production process of mercury thermometers has major environmental safety risks and hidden dangers to human health. The production process of the glass mercury thermometer includes cutting, neck pulling, throat constriction, mercury injection, head sealing, semicolon, printing, color drying, packaging and other processes, among which steps such as vacuum expansion and mercury distillation in the mercury injection process are directly Exposure to the production environment, the evaporation of mercury in the air threatens the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K5/22G01K13/20
Inventor 王卫健刘培银
Owner 东阿阿华医疗科技有限公司
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