Disc spring loading type wedge-shaped dynamic sealing structure for ultralow-temperature device

Abstract

The invention discloses a disc spring loading type wedge-shaped dynamic sealing structure for an ultralow-temperature device and relates to the field of rotating shaft dynamic sealing structures for ultralow-temperature devices. The structure comprises a non-metal wedge-shaped sealing ring, a metal retainer ring, a loading disc spring set and an adjusting gasket; the non-metal wedge-shaped sealingring is located at the joint of an outer valve shell and an outer valve rotating shaft; the metal retainer ring is arranged on the outer wall of the outer valve rotating shaft in a sleeving mode; themetal retainer ring is fixedly arranged in a small-diameter groove in the top in the outer valve shell; the loading disc spring set is fixedly installed in a large-diameter groove in the lower end ofthe outer valve shell; the upper surface of the loading disc spring set is in contact with the lower surface of the metal retainer ring; the upper surface of the adjusting gasket is in contact with the lower surface of the loading disc spring set; the lower surface of the adjusting gasket and the lower surface of the outer valve shell are located on the same plane. The structure has the functionsof isolating an engine medium and controlling gas, and has the advantages of being small in structural size, low in weight, high in reliability, simple in forming process and the like.

Description

technical field [0001] The invention relates to the field of a rotating shaft dynamic sealing structure for ultra-low temperature devices, in particular to a disc spring-loaded wedge-shaped dynamic sealing structure for ultra-low temperature devices. Background technique [0002] It relates to an ultra-low temperature pneumatic rotating shaft sealing device in the field of aerospace, which is used to isolate the engine medium and control gas. The structure of the pneumatic rotary shaft sealing device in the previous models mostly adopts the series and parallel connection of bellows components to realize the isolation of the control gas and the engine medium. This structure has great advantages for small-diameter sealing devices. As the thrust of the engine continues to increase, the caliber of the valve increases accordingly, and the size and stroke of the bellows are greatly increased. Multiple bellows in series and in parallel are required to meet the requirements of high ...

AI Technical Summary

Problems solved by technology

As the thrust of the engine continues to increase, the caliber of the valve increases accordingly, and the size and stroke of the bellows are greatly increased. Multiple bellows in series and in parallel are required to meet the requirements of high pressure and large stroke use, resulting in a complex motion system and prone to motion jams. hysteresis, and make the sealing device bulky and heavy

At the same time, the forming process of large-sized bellows components is complex and the production cycle is long, which does not meet the requirements of lightweight and high reliability of aerospace system products

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