Ultralow-temperature liquid nitrogen test box

Abstract

The invention relates to an ultralow-temperature liquid nitrogen test box, which comprises a test box body, an air circulation device, a control device, a liquid nitrogen spraying device, a door sealing system, a hinge, a heater, a temperature sensor and a door lock; four sets of primary and secondary tanks are arranged on a door of the test box; glass fiber pipes are arranged in the primary and secondary tanks; the door can be closed and firmly pressed, so that low-temperature nitrogen in the box from can be prevented from directly contacting flexible silicone rubber used for sealing; in order to prevent the silicon rubber from embrittlement and inactivation at an extremely low temperature, heating wires are arranged around the door frame of the door, so that the silicon rubber is alwayskept at the optimal working temperature close to the normal temperature; and a glass observation window is arranged on the equipment door, the glass observation window is a coating film heating type multilayer hollow observation window, heating wires are arranged in the glass observation window, and therefore, water vapor can be effectively prevented from being condensed on the surface of the glass observation window when the equipment is at a low temperature; and glass fiber pipes and fluororubber sealing strips are used for sealing the periphery of the glass observation window to achieve overall sealing of glass.

Description

technical field [0001] The invention relates to a test box, in particular to an ultra-low temperature liquid nitrogen test box. Background technique [0002] The ultra-low temperature liquid nitrogen test chamber belongs to the type of test chamber with a high degree of difficulty. The main difficulty lies in that the lowest temperature of the test chamber can reach -180°C. Therefore, it is difficult to realize the door sealing device of the entire test chamber. It will become brittle, harden and seal failure at around -100°C. Therefore, for ultra-low temperature liquid nitrogen test chambers, it is necessary to find new sealing materials and new sealing methods to realize the sealing of liquid nitrogen. [0003] Whether the door seal of the ultra-low temperature liquid nitrogen test chamber is successfully developed is the foundation of whether this type of equipment can be successfully developed. When the liquid nitrogen test is carried out in the low temperature test cham...

AI Technical Summary

Problems solved by technology

However, the current test chamber cannot solve the sealing problem under ultra-low temperature conditions.

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