Special safety sealing structure for supercritical CO2 for protecting bearing box

Abstract

The invention provides a special safety sealing structure for supercritical CO2 for protecting a bearing box, relates to the supercritical working medium sealing, and solves the technical problem of damage of the bearing box when more supercritical CO2 is leaked. A sealing cavity body is connected to one side of the bearing box; a dry air sealing structure is arranged in a sealing cavity of the sealing cavity body; a main shaft penetrates through the bearing box and the sealing cavity; the safety sealing structure comprises a static ring and a dynamic ring; a labyrinth sealing structure is arranged between the static ring and the main shaft; the static ring is tightly connected with the inner wall of the sealing cavity; and the dynamic ring is tightly connected with the main shaft. The structure further comprises an automatic return mechanism for automatically returning the static ring, a spring base and a spring; and the static ring is returned after recovery of the system pressure. The structure is used for sealing when more supercritical CO2 is leaked, achieves excellent sealing performance, effectively protects the safety of the bearing box, and improves the whole unit reliability.

Description

technical field [0001] The invention relates to a supercritical working fluid seal, in particular to a supercritical CO 2 Special safety sealing structure. [0002] technical background [0003] In the prior art, supercritical CO 2 As a new power generation technology, power generation uses supercritical carbon dioxide as a working medium to convert heat from heat sources into mechanical energy. The heat sources can come from nuclear reactors, solar energy, geothermal energy, industrial waste heat, and fossil fuel combustion. Under the current energy and environmental protection situation, the excellent characteristics of supercritical carbon dioxide working medium make its system have good application prospects and research value. [0004] However, the currently used sealing structure is a dry gas seal. However, when a large leakage occurs in the dry gas seal, the CO 2 into the bearing housing and cause damage. [0005] The applicant finds that the prior art has at leas...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of supercritical CO that protects the bearing box 2 Special safety sealing structure, to solve the sealing structure in the prior art in supercritical CO 2 When a large leak occurs, CO 2 Access to the bearing housing, causing damage, technical problems that increase the production cost of the workshop

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