A compact redundant sealing structure

Abstract

A compact redundant sealing structure is characterized in that it includes a first housing (1), a second housing (2), an oil pin (3), a first sealing ring (4), a second sealing ring ( 6) and the third sealing ring (8); the joint of the first casing (1) and the second casing (2) is provided with an oil passage pin (3), and the sides of the oil passage pin (3) are respectively provided with The first seal ring groove and the second seal ring groove, the first seal ring groove and the second seal ring groove are respectively provided with a first seal ring (4) and a second seal ring (6); the first housing (1) Or the second casing (2) is further provided with a third sealing ring groove or an annular hole, and a third sealing ring (8) is arranged in the third sealing ring groove or the annular hole. The third sealing ring (8), the first sealing ring (4) and the second sealing ring (6) respectively constitute a redundant sealing structure on one side. The invention has compact structure and good reliability, can realize double-channel sealing in the compact structure, and effectively avoid oil leakage often occurring in the single-channel sealing structure.

Description

technical field [0001] The invention belongs to a sealing structure, in particular to a redundant sealing structure. Background technique [0002] The sealing performance is one of the key performances of the electro-hydraulic servo mechanism. The performance degradation or failure of the servo machine due to sealing failure accounts for 50% of the servo failures. Therefore, the sealing reliability is particularly important for the electro-hydraulic servo mechanism. The single-channel sealing structure is subject to the comprehensive influence of the performance consistency of the seal, the processing and assembly errors of the structural parts, and the external environment, etc., oil leakage and failure often occur. Redundant sealing design is carried out for important sealing parts, that is, two sealing structures are set at the sealing parts, and the second sealing is used as a redundant structure. When the first sealing structure fails, the second sealing structure can s...

AI Technical Summary

Problems solved by technology

Due to the limitation of structural space, if the structure of the sealing part is compact, the implementation of the above-mentioned second sealing structure may lead to structural interference, making the above-mentioned sealing redundant design method impossible to implement

The sealing of the oil hole between the shells of the electro-hydraulic servo mechanism is limited by the structural space, and the redundant design of the seal is relatively difficult. See figure 1 , the oil hole between the first housing and the second housing is sealed with an axial sealing structure. If two sealing structures of the same type are used for redundant sealing, an additional seal is added on the radially outer side of the first seal. If the sealing structure is used, the second sealing structure interferes with the spigot below the oil hole of the first housing, and there is no room for implementation. It is difficult to obtain a satisfactory sealing effect with a single sealing structure, and oil leakage often occurs

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