Drinking water long-term storage water tank for space station

Abstract

The invention discloses a drinking water long-term storage water tank for a space station. The drinking water long-term storage water tank comprises a butterfly nut (1), a locking screw (2), a pin (3), an air port connector (4), bolts (5), a handle (6), an inner end cover (7), an inner end cover and outer end cover sealing O-shaped ring (8), an outer end cover (9), an outer end cover and shell sealing O-shaped ring (10), a shell (11), an inner bag (12), an air port connector sealing O-shaped ring (13), a steel wire barrel (14), a first liquid path disconnector (15), a second liquid path disconnector (19) and a liquid path disconnector sealing O-shaped ring (16). The shell and the outer end cover are made of metal. The inner bag (12) is made of nine-layer composite film. The water tank has the advantages that the water tank is simple in structure, capable of bearing high operation pressure, capable of being demounted, good in compatibility with water, high in air stopping performance, high in airtightness, reusable and long in service life, and has two internal medium extrusion manners.

Description

technical field [0001] The invention relates to a water tank for long-term storage of drinking water in a space station. Background technique [0002] The general water tank of the space station is a common water storage container for the space station's environmental control and life support subsystem (ECLSS). The media stored or contacted in the water tank include astronauts' drinking water added with silver ions, condensed water, ultrapure water purified by the urine treatment device, etc. . Therefore, in addition to meeting the leakage rate index and discharge efficiency index of the general water tank container, in addition to the specific functional requirements for the general water tank of the space station, it is also necessary to meet the compatibility test requirements with the above-mentioned various media, high reliability requirements and on-orbit use. Wait for other requirements. [0003] The water tanks used on the International Space Station are mainly CWC...

AI Technical Summary

Problems solved by technology

[0003] The water tanks used on the International Space Station are mainly CWC water tanks. The water tank uses fiber cloth as the outer bag protection cover. The size error is too large; in addition, the fiber cloth outer bag is the main pressure-bearing component, and the warp and weft stress states of the fiber cloth are different, making it difficult for the water tank to withstand high pressure

When there is an extreme situation inside the space station, such as in a vacuum state, the water tank needs to withstand a pressure of at least 100kPa. In addition, the water tank itself is under pressure, and the pressure difference between the inside and outside of the water tank is too large, making it difficult to guarantee the safety of the water tank.

In addition, the water inlet and outlet of the CWC water tank are the same. Once there is gas inside the water tank during the filling process, the gas will be difficult to discharge, which will endanger the safety of the water tank.

There is no fixing device for the inner and outer bladders of the CWC water tank, and the inner bladder is prone to misalignment during the water injection process, resulting in misalignment of the water injection interface of the water tank.

[0004] The existing space station water tank is difficult to withstand high operating pressure, and it is difficult to ensure reliability under the extreme conditions (vacuum) of the space station

The water tank of the space station mostly uses metal parts that are in direct contact with water. Metal parts will chemically react with drinking water, resulting in changes in water quality, making it difficult to ensure long-term compatibility.

In addition, the drainage method of the CWC water tank is relatively simple, and the liquid can only be discharged by pumping.

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