A shaft end sealing device for organic working fluid centripetal turbine

Abstract

The invention discloses a shaft end seal device for an organic working medium radial-inward-flow turbine. The shaft end seal device comprises a first seal ring, a second seal ring and a housing, wherein the first seal ring is arranged on a rotating shaft, belongs to carbon ring seal and is used as a primary seal for sealing and blocking the leakage of an organic working medium, produced at the shaft end by the turbine; the second seal ring is arranged on the rotating shaft, is axially spaced from the first seal ring for a certain distance, belongs to labyrinth seal, and is used as a secondary seal for sealing and blocking the further leakage of the organic working medium leaking at the shaft end by the turbine; the housing is a casing with a groove formed in the middle, and the two support ends of the casing are respectively hermetically connected and fixed with the first seal ring and the second seal ring, so that seal spaces are formed between the middle groove of the casing and the two seal rings and are used as gas collecting chambers for collecting the organic working medium gas which still leaks through the primary seal at the shaft end of the turbine and facilitating concentrated emission. The turbine is simple in structure and convenient to maintain. Meanwhile, an external air source is not required, and the pollution of external air to the working medium gas in the turbine is avoided.

Description

technical field [0001] The invention relates to the technical field of centripetal turbines, in particular to a shaft end sealing device for a centripetal turbine, which is suitable for the shaft end seal of a centripetal turbine whose working gas is a special gas and has a relatively high rotational speed. Background technique [0002] As environmental pollution and energy shortages continue to intensify, medium and low temperature heat sources such as solar energy, geothermal energy, biomass energy, and industrial waste heat have received widespread attention in my country's energy system. Due to the thermophysical properties of organic working fluids with low boiling points, the organic Rankine cycle has the advantages of high cycle efficiency and simple system structure in the process of thermal work conversion of medium and low temperature heat sources. As an important prime mover to realize thermal power conversion in the organic Rankine cycle power generation system, ...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the existing shaft-end sealing device, the present invention provides a shaft-end sealing device for an organic working medium centripetal turbine, which can completely solve the problem of the organic working medium centripetal turbine from For the problem of shaft end leakage, the leaked organic working gas is collected and processed, and at the same time, the pollution of the working gas by the external gas source is avoided, and the structure is simple, the cost is low, and the system is easy to maintain

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