Foil end face air film sealing structure capable of rotating bi-directionally

Abstract

A foil end face air film sealing structure capable of rotating bi-directionally comprises a movable ring and a static ring which are in air film sealing. The sealed end face of the movable ring or the static ring is provided with foil capable of rotating bi-directionally, and the foil comprises an annular ring body 1, foil 2 and elastic cushions 3. The inner side of the ring body 1 is protruded, an annular step is formed on the inner side of the annular ring body 1, and a sealing dam 5 is formed on the top surface of the annular step. A plurality of elastic cushions 3 are circumferentially sequentially laid on the bottom surface of the annular step. The elastic cushions 3 are fixed on the ring body 1, each elastic cushion 3 is covered with a piece of foil 2, and the two ends of the foil 2 are fixed on the ring body. The upper surface of the foil 2 is a curved surface which is of a radial symmetrical structure divided from the middle, and the plane of the sealing dam is higher than the lowest surface of the upper surface of the foil and lower than the highest surface.

Description

(1) Technical field [0001] The invention relates to the technical field of mechanical end face sealing structure design, in particular to a bidirectionally rotatable foil end face air film sealing structure, which is especially suitable for shaft end air film sealing devices of various high-speed rotating mechanical shafts. (2) Background technology [0002] End face air film seal, also known as dry gas seal, is a new type of mechanical seal. At present, dry gas seal is widely used in compressors, pumps, reactors, etc. due to its superior performance such as low leakage, low power consumption, and long life. The shaft end seal of rotating machinery, but with the rapid development of modern industry and aerospace, the application environment of dry gas seal is required to develop to high parameters (high speed, high pressure, high temperature, etc.) or variable working conditions. However, the traditional dry gas seal is currently used in There are many deficiencies under hig...

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Problems solved by technology

[0002] End face air film seal, also known as dry gas seal, is a new type of mechanical seal. At present, dry gas seal is widely used in compressors, pumps, reactors, etc. due to its superior performance such as low leakage, low power consumption, and long life. The shaft end seal of rotating machinery, but with the rapid development of modern industry and aerospace, the application environment of dry gas seal is required to develop to high parameters (high speed, high pressure, high temperature, etc.) or variable working conditions. However, the traditional dry gas seal is currently used in There are many deficiencies under high parameters or changing working conditions: under high speed or changing working conditions, traditional dry gas seals are prone to instability, and its film thickness is also difficult to control; under high temperature conditions, traditional dry gas seals The deformation of the sealing end face is serious, which can easily lead to wear of the dynamic pressure groove on the end face and cause the failure of the dry gas seal

[0005] At present, there have been related reports on foil end face air film sealing, but most of the proposed foil end face air film seal structures are in the form of one-way rotation. In engineering practice, many rotating machines will reverse in some special cases. At this time, the two sealing end faces of the foil end face air film seal in the form of one-way rotation will be sucked together tightly and violent dry friction will occur. In severe cases, the sealing ring will be broken and the entire unit will be damaged, eventually causing serious accidents.

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