A Composite Getter Device at Room Temperature for Vacuum Insulation Panels

Abstract

The invention discloses a normal temperature composite getter device for a vacuum heat insulation plate. The normal temperature composite getter device comprises getter alloy powder, drying agent powder and metallic oxide powder, wherein the getter alloy powder, the drying agent powder and the metallic oxide powder are contained in a first metal jar, and the getter alloy powder contains barium lithium alloy. The upper end of the first metal jar is open, and a layer of metallic oxide powder of which the average particle size ranges from 2 micrometers to 20 micrometers is laid at the bottom of the internal space of the first metal jar. A second metal jar with the open upper end is placed on the metallic oxide powder layer and is filled with the getter alloy powder of which the average particle size ranges from 100 micrometers to 200 micrometers, and a metal protective net of which the mesh size ranges from 10 micrometers to 100 micrometers covers an opening of the second metal jar. The drying agent powder of which the average particle size ranges from 20 micrometers to 100 micrometers covers the second metal jar and the metallic oxide powder layer and is compacted in the internal space of the first metal jar. By the adoption of the normal temperature composite getter device, water can be effectively prevented from rapidly permeating into getter alloy to generate chemical reactions to cause combustion and even explosion.

Description

technical field [0001] The invention relates to a getter device, which can be used in a vacuum insulation panel to absorb residual gas in the panel to maintain a good vacuum environment in the panel, so as to improve the heat insulation performance of the vacuum insulation panel and prolong the service life. Background technique [0002] Vacuum insulation panel (Vacuum Insulation Panel referred to as VIP) is a new type of high-efficiency thermal insulation material developed in recent years. It is composed of filled core material, gas barrier film and getter. The heat transfer caused by air is suppressed by increasing the vacuum inside the panel, so that the thermal conductivity can reach 0.002-0.004w / mK, which is 1 / 10 of the thermal conductivity of traditional thermal insulation materials, and the thickness is only 1 / 7-1 of traditional thermal insulation materials. / 10, so as to achieve the purpose of heat preservation, energy saving and space saving. It has been widely u...

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Problems solved by technology

[0005] The disadvantage of this getter device is that the desiccant will release a lot of heat when the getter meets water, and the barium-lithium alloy will release a lot of heat and burn when it meets water, and the hydrogen gas released by the reaction between the barium-lithium alloy and water will Combustion and explosion under the combined action of heat and alloy combustion

The getter of the getter device is an uncompressed powder mixture. In addition to the problem of safety in use, the getter device can easily absorb a large amount of gas when it is exposed to the air for a short time. It is difficult to extract during the VIP process, and there is a long deflation process after the VIP is sealed, which has a great negative impact on the vacuum inside the VIP

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