Multi-stage pressure reduction sealing structure and sealing method thereof

Abstract

The invention relates to a multi-stage pressure reduction sealing structure and a sealing method thereof, and belongs to the technical field of vacuum sealing. The multi-stage pressure reduction sealing structure comprises a high-vacuum container, a contact sealing shaft sleeve, a sealing material, a multi-stage pressure reduction container, a pressure reduction sealing shaft sleeve and a rotatingshaft; the contact sealing shaft sleeve is arranged at the sealing outlet end of the high-vacuum container, is arranged on the rotating shaft in a sleeving manner and is connected with the multi-stage pressure reduction container through a bolt; a containing cavity is formed in the inner wall of the contact sealing shaft sleeve, the containing cavity is filled with the sealing material, and first-stage contact type sealing is formed; and the pressure reduction sealing shaft sleeve is assembled on the rotating shaft in an interference fit manner, and the right end of the pressure reduction sealing shaft sleeve is connected with an input shaft through a bolt for transmitting torque. The multi-stage pressure reduction sealing structure has the advantages that the requirement for the vacuum degree of a pressure reduction sealing container is lowered, equivalent conductance of a gap channel is reduced, and long-life reliable high-vacuum sealing of a large-volume container at a high-rotating-speed and large-shaft-diameter rotating shaft extending end can be achieved.

Description

technical field [0001] The invention relates to a multi-stage decompression sealing structure and a sealing method, belonging to the technical field of vacuum sealing. Background technique [0002] Decompression sealing is to set up an additional container outside the high vacuum container, and to establish a gap channel between the additional container and the high vacuum container, and to control the air leakage rate of the high vacuum container within the allowable range by pre-evacuating the additional container. Non-contact vacuum dynamic sealing method. The decompression sealing method has simple structure and reliable performance, and has no restrictions on the diameter of the vacuum-sealed shaft, vacuum degree, and container size. Lifetime Reliable Vacuum Sealed. However, the traditional decompression sealing method and sealing structure adopt one-stage decompression, that is, only an additional container is arranged outside the high vacuum container, and there is ...

AI Technical Summary

Problems solved by technology

However, the traditional decompression sealing method and sealing structure adopt one-stage decompression, that is, only an additional container is arranged outside the high vacuum container, and there is a direct current gap channel between the additional container and the high vacuum container.

To achieve a high vacuum degree in a sealed container, especially the sealing of a large-sized rotating shaft, the requirements for the vacuum degree of the additional container and the conductance of the gap channel between the containers are very high, which is difficult to achieve

[0003] The decompression sealing structures in patent literature (CN209370457U), patent literature (CN205207618U) and patent literature (CN203009369U) all use only an additional container cavity and a direct current gap channel, which are all sealed for high-pressure containers and cannot achieve vacuum High vacuum degree of the container, and only a small size shaft seal can be achieved

Patent documents (CN208686974U), patent documents (CN203809704U) and patent documents (CN203009369U) and other public documents adopt multi-stage decompression sealing structures, but they are all sealed to high-pressure containers, and the high vacuum degree of vacuum containers cannot be realized. And not suitable for the rotary seal of the shaft

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