Thermocouple device for measuring tin bath temperature in float glass furnace

Abstract

The invention discloses a thermocouple device for measuring tin bath temperature in a float glass furnace. The device includes an armoured thermocouple used for temperature measurement, a junction boxwhich has a junction base inside and is used for outputting the temperature measured by the armoured thermocouple, and a supporting pipe connected to the junction box. The armoured thermocouple is placed in the supporting pipe; the lower end of the supporting pipe is connected to a thermocouple protective sleeve made of graphite and a heat insulation block placed between the supporting pipe and the thermocouple protective sleeve; the thermocouple protective sleeve has a containing cavity; and the temperature measuring end of the armoured thermocouple passes through the heat insulation block after protruding from the lower end opening of the supporting pipe, and is placed in the containing cavity. The advantages of the thermocouple device are that the device is not easy to corrode, pollution of glass solutions and tin liquor cannot be caused, the structure of the device is simple, the thermal response time is short, and the accuracy of temperature measurement is high.

Description

technical field [0001] The invention relates to a thermocouple device, in particular to a thermocouple device used for the temperature of a tin bath in a float glass melting furnace. Background technique [0002] In the float glass melting furnace, the float glass tin bath has an air-tight space with a complex structure, which is composed of three phases of glass melt, tin liquid and protective gas. The protective gas usually uses N2 and H2, and the temperature can reach 1100 °C . In order to prevent the molten glass from being polluted, the design and development of the thermocouple protection sleeve material and structure used for tin bath temperature measurement has always been a difficult problem in temperature measurement in the glass industry. [0003] At present, infrared thermometers are generally used for temperature measurement, but they have the following disadvantages: 1. It can only measure the surface temperature, and it is inconvenient to measure the temperat...

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Problems solved by technology

[0003] At present, infrared thermometers are generally used for temperature measurement, but they have the following disadvantages: 1. It can only measure the surface temperature, and it is inconvenient to measure the temperature inside the object and when there are obstacles. The tin bath wall is lined with refractory materials, steel bars and graphite and other components, the wall thickness of about 300mm has a great influence on temperature measurement; 2. There are many environmental disturbances, such as ambient temperature, dust in the air, light, etc. will lead to inaccurate measurement values; 3. The thermometer should be vertically aligned with the measured The surface of the object, in any case, the angle cannot exceed 30°C

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