Structure of extraction opening and manufacturing method

Abstract

The invention discloses a structure of an extraction opening. The structure is characterized in that the extraction opening is formed by punching in upper glass of vacuum glass; a sealing groove is formed in the upper part of or inside the extraction opening; a sealing cover is arranged on the sealing groove; the edge of the sealing cover is inserted into the sealing groove; an extraction channel is formed between the sealing cover and the sealing groove; after the edges of the upper glass and lower glass are sealed, a metal solder is put into the sealing groove or onto the sealing cover; the extraction opening is vacuumized and heated to melt the metal solder into liquid; the liquid is kept in the sealing groove; the edge of the sealing cover is submerged in the liquid; the extraction opening is automatically sealed by using a liquid sealing principle; and after cooling, the liquid is frozen to realize air-tight sealing of the extraction opening. Through adoption of a method disclosed by the invention, batch production can be realized; the production efficiency and yield of the vacuum glass can be increased greatly; and the production cost is reduced.

Description

technical field [0001] The invention belongs to the field of vacuum glass, and in particular relates to a structure and a manufacturing method of an air suction port. [0002] Background technique [0003] The existing vacuum glass is generally composed of two or three pieces of flat glass. The glass is sealed with low-temperature glass solder around the edges, and there is a tiny support in the middle. A thin layer of 0.1-0.2mm thickness is formed between the two pieces of glass by pumping air. Vacuum layer. Since there is no heat and sound transmission of gas, and the inner surface of the glass can have a transparent low-heat radiation film, the vacuum glass has good heat insulation and sound insulation effects, and is one of the best performance energy-saving glasses. [0004] The key technologies of the existing vacuum glass include: one is edge sealing, the other is the placement of supports, and the third is the acquisition and maintenance of vacuum. There are two m...

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Problems solved by technology

The disadvantage of the first method is that the vacuuming process is complicated and the production efficiency is very low: because the suction pipe is very thin, the vacuum layer is very thin, the suction resistance is large, the speed is small, and single-chip extraction is required, so the production efficiency is very low; The two methods can solve the shortcomings of the first method, but because the low-temperature glass solder is made of a variety of oxides, under high temperature and vacuum, the air and moisture absorbed by the solder, volatile substances in the solder, and the solder during production The gas dissolved in the process and the decomposition of some oxides in the solder will cause a large number of bubbles in the solder, which will greatly weaken the performance of the solder, especially the air tightness, which will greatly affect the feasibility of this method.

Another method is between the above two methods, that is, prefabricating the air extraction port on the glass, then vacuumizing after sealing the edge at high temperature, and finally using solder to seal and weld the metal sheet on the air extraction port; The disadvantage is that if you use glass solder, you will encounter the same difficulties as the second method. If you use metal solder for brazing, you will encounter great difficulties in how to achieve airtight welding of small and light metal sheets under vacuum conditions. Its economic benefits are not necessarily better than the first way

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