Thermal conductivity meter for vacuum glass

Abstract

A thermal conductivity meter for vacuum glass comprises an upper shell, a lower shell, a cold plate, a hot plate, a vacuum system and a control system, the cold plate and the hot plate are respectively arranged in the upper shell and the lower shell or in a closed space formed by the upper shell and the lower shell, and vacuum glass to be tested is arranged between the cold plate and the hot plate; after the upper shell and the lower shell are closed, the internal of the formed closed space is pumped into a high vacuum by the vacuum system, and the high vacuum is used to obtain a better thermal insulation performance than the vacuum glass and provide a standard correction; and the constant temperature power and the effective area of the hot plate and the constant temperatures of the hot plate and the cold plate are read and measured, and are used to calculate the thermal conductivity of the tested vacuum glass; or the constant temperature powers needed by the measurement of the hot plate during the measurement of the vacuum glass and a correction standard plate are respectively read, and the calculated thermal conductivity of the correction standard plate is used to directly obtainthe accurate thermal conductivity of the vacuum glass. The thermal conductivity meter can solve the heat dissipation problem during the measurement of the hot plate and the provision problem of the correction standard plate.

Description

technical field [0001] The invention relates to a measuring device, in particular to a vacuum glass thermal conductivity meter. Background technique [0002] Vacuum glass is one of the best energy-saving glasses, and its thermal insulation performance is generally expressed by the heat transfer coefficient, which can be obtained through heat conduction. Since the heat transfer coefficient of vacuum glass is very small, the error is very large when measured with an existing thermal conductivity meter. For example, when the heat transfer coefficient is less than 1, the measurement error is ±0.1. Theoretically, the heat transfer coefficient of vacuum glass The coefficient can be as small as 0.2, in which case the error of existing thermal conductivity meters is unacceptable. Although there are many devices and methods for measuring the heat transfer coefficient of vacuum glass in the prior art, such as patent applications CN02243245.0, CN200320126692.1, CN200620131674.6, CN200...

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Problems solved by technology

Since the heat transfer coefficient of vacuum glass is very small, the error is very large when measured with an existing thermal conductivity meter. For example, when the heat transfer coefficient is less than 1, the measurement error is ±0.1. Theoretically, the heat transfer coefficient of vacuum glass The coefficient can be as small as 0.2, in which case the error of existing thermal conductivity meters is unacceptable

Although there are many devices and methods for measuring the heat transfer coefficient of vacuum glass in the prior art, such as patent applications CN02243245.0, CN200320126692.1, CN200620131674.6, CN200710003450.6, CN201210017369.4 and CN201210111168.0, etc., but for the same thickness For thermal insulation materials, the thermal conductivity of vacuum glass is the smallest, and it is difficult to find a better thermal insulation panel than vacuum glass, so the above devices and methods cannot solve the problem of measuring the heat dissipation of the thermal panel and provide a known accurate heat transfer coefficient or heat dissipation. Therefore, it is difficult to accurately measure the heat transfer coefficient of vacuum glass in the existing technology

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