Low-temperature anti-fog viewing lens

Abstract

The invention relates to a low-temperature anti-fog viewing lens. The low-temperature anti-fog viewing lens comprises a cover plate flange, viewing lens glass and a base flange, wherein the viewing lens glass is fixedly connected between the cover plate flange and the base flange, the upper portion of the cover plate flange is fixedly connected with a threaded viewing lens in a sealed manner, and quartz glass is embedded in the threaded viewing lens; and a drying box is arranged in an interlayer between the cover plate flange and the threaded viewing lens and embedded in the inner wall face of the threaded viewing lens. According to the low-temperature anti-fog viewing lens, the anti-fog effect can be achieved by adopting common quartz glass, and special glass with vacuum in the middle does not need to be adopted, so that the cost is greatly saved; and the inner wall face of the threaded viewing lens with the quartz glass is filled with a drying agent, and the threaded viewing lens is screwed into the cover plate flange through the threads, so that the same anti-fog effect as middle vacuum double-layer structure glass is achieved, the sealing performance is good, the service life is long, and the replacement cost is reduced.

Description

technical field [0001] The invention relates to a sight glass for observing the flow of working medium inside a machine equipment, in particular to an anti-fog sight glass. Background technique [0002] The sight glass is mostly used in the pipeline equipment of industrial installations such as pharmaceutical industry, chemical plant, food, water conservancy project, etc. to observe the flow of working fluid inside the machine equipment and avoid safety accidents. It is an indispensable part to ensure normal production. However, the traditional single-layer sight glass is used in low-temperature pipeline equipment, and the external humid air is easy to produce mist when it is cold on the glass of the sight glass, which interferes with normal observation. [0003] At present, the most used anti-fog method is to use double-layer glass with a vacuum in the middle, and the middle cavity is a vacuum, so that the inner glass can lack moisture and cannot be fogged, such as Chinese ...

AI Technical Summary

Problems solved by technology

However, if the vacuum chamber is used for a long time, gas, water vapor, etc. will penetrate into the vacuum chamber, and the demisting effect will be reduced.

In the Chinese patent CN210219031U, a double-layer sandwich structure is realized by using spring buckles and sealing quartz glass, and a desiccant is filled in it. Although this type of sight glass can obtain a good anti-fog effect and is easy to operate, due to the force of the spring The small size makes the sealing performance not good enough, and the spring buckle is easy to lose its elasticity after long-term bending and stretching, and the service life is short. The spring accessories need to be replaced frequently, and the later maintenance cost is high.

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