The structure and manufacturing method of the double-vacuum layer suction port

Abstract

A double-vacuum layer exhaust opening structure is characterized in that openings are formed in upper glass and middle glass of vacuum glass to serve as two exhaust openings, two seal grooves are formed above or inside the two exhaust openings respectively; two seal covers are arranged on the seal grooves respectively, and the edges of the seal covers are inserted into the seal grooves respectively; exhaust passages are formed between the seal covers and the seal grooves; after edge sealing for the upper, lower and middle glass, metal solder is placed into the two seal grooves or on the seal covers respectively; then vacuumizing and heating are performed on a vacuum heating furnace, so that the metal solder can be molten to be liquid; the liquid is stored in the seal grooves, and the edges of the seal covers are immersed in the liquid, so that the exhaust openings are automatically sealed by utilizing the liquid sealing principle; after the liquid is solidified due to temperature drop, the airtight sealing is realized. With adoption of the method disclosed by the invention, batch production can be realized, production efficiency and qualification rate of the vacuum glass can be greatly improved, and production cost is lowered.

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 a double-vacuum layer air suction port. Background technique [0002] 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. [0003] 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 ...

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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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