Piston for pressure balance

Abstract

The invention discloses a piston for pressure balance, which is characterized in that the piston is a cylindrical tube piece with one end closed, the side wall of the longitudinal section of the cylindrical tube piece along the axle line is a V-shaped corrugated surface; the outer side wall and the inner side wall of the V-shaped corrugated surface have the same corrugation shape and the outer side wall is at the same level with the inner side wall along the radial direction. By utilizing the pressure balance, the piston of the invention can have the reliable sealing performance under the pressure in the deep sea and maintain the flexible movement of the piston.

Description

technical field [0001] The present invention relates to sealing devices, more particularly for use in sealing piston members in underwater pressure equalization structures. Background technique [0002] With the deepening of ocean observation and development, underwater instruments and equipment, including underwater robots, underwater sensors, underwater operating tools, underwater power sources, etc., are constantly moving towards the ocean, facing the problem of high water pressure in the ocean with an average water depth of 3,800 meters When only using the pressure-resistant design, it will not only increase the volume and weight of underwater instruments and equipment, but also cause the accuracy of underwater force sensors to decrease or even fail to work. Pressure balance or pressure compensation technology is an effective way to solve this problem at present. [0003] So far, the pressure balance used at home and abroad mainly uses elastic components, such as compen...

AI Technical Summary

Problems solved by technology

However, the movement of the piston in the deep sea must not only ensure strict sealing, but also move flexibly, which is a new problem and new challenge for the existing piston sealing technology

Usually the structure of the piston sealing ring, when the pressure of the piston working liquid increases, the contact pressure between it and the cylinder increases, and the contact width increases and is more obvious, resulting in an increase in the resistance of the piston movement, and the inside and outside of the underwater instrument and equipment The pressure difference increases and the pressure equalization capacity decreases

[0005] Patent 03113254.5 proposes a multi-axis force sensor pressure balance device for underwater robots, and discloses an integral thin-walled tubular piston that integrates sealing and dustproof structures, but according to the specific shape proposed in its specific implementation , in practical application, the axial stiffness of the piston will be relatively large, so it is difficult to better meet the requirement of relatively small axial stiffness of the elastic piston in patent 03113254.5; at the same time, the radius of curvature of the corrugated top where the piston and the cylinder wall are in contact is difficult to achieve. Smaller, so that under the same interference fit, the contact width between the piston and the cylinder wall is larger, and the frictional resistance of the piston movement is larger

In addition, the piston form disclosed in the patent 03113254.5 is too fine in its dustproof structure, which is difficult to process, and also increases the contact width between the piston and the cylinder wall

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