A two-way sealing device with ultra-low temperature and high load

Abstract

The invention relates to an ultra-low temperature and high load-bearing bidirectional sealing device, which solves the problems of short service life, high cost and poor sealing performance of the existing shaft hole sealing structure. The device includes a sealing frame and two sets of dynamic sealing units, the dynamic sealing unit includes a spring sheet, a plastic ring and a pressing sleeve; the sealing frame is a sleeve structure, the outer end surface of the sleeve structure is provided with an annular sealing plate, and the two end surfaces of the annular sealing plate It is in contact with the sealed device to form a static sealing surface; the inner surface of the sleeve structure is provided with a partition, which separates the inner cavity of the sleeve into two symmetrical sealing chambers, and the sealing units are respectively arranged in the sealing chambers; the pressing sleeve is arranged in the In the sealing cavity, the inner surface of the end is provided with an annular boss, and the annular boss is provided with a pressure-inducing hole along the axial direction; the front end of the plastic ring is installed on the partition plate of the sealing frame, and the middle part is pressed on the installation shaft. The end is installed on the annular boss of the pressing sleeve; the spring sheet is sleeved between the plastic ring and the pressing sleeve, which includes a fixing ring and a plurality of elastic diaphragms.

Description

technical field [0001] The invention relates to a sealing device, in particular to an ultra-low temperature and high load-bearing bidirectional sealing device. Background technique [0002] In liquefied natural gas, ultra-low temperature liquid rocket engines and test systems, the shaft hole sealing structure has a wide range of uses. The commonly used ultra-low temperature (lowest to -196°C) shaft hole sealing structures include pan-plug dynamic seals, packing seals and metal thin-wall seals. Among them, the service life of pan-seal dynamic seal is short at ultra-low temperature, and the metal thin-walled sealing structure has high requirements on the manufacturability of production and processing. The structure is difficult to process, the cost is high, and the production cycle is long; the service life of the packing seal is short, and the sealing performance becomes poor due to the lack of compensation structure after multiple actions. [0003] There are a large number...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of short service life, high cost, large structural size, poor workmanship and poor sealing performance in the existing shaft hole sealing structure, and to provide a two-way sealing device with ultra-low temperature and high load

The ultra-low temperature and high load-bearing two-way sealing device of the present invention adopts a dynamic and static sealing separation scheme to solve the above-mentioned problems of short life of the sealing structure, poor sealing performance, large structural size and poor processing technology, and provides an effective solution for the dynamic sealing of the ultra-low temperature system.

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