Static scroll and scroll expander and generator set

Abstract

The invention discloses a fixed scroll, a scroll expander using the fixed scroll, and a generator set using the scroll expander. The generator set includes a closed casing, a scroll expander and a generator set inside it. , the scroll expander includes a fixed scroll and a moving scroll that are meshed to form an expansion chamber. The air inlet of the fixed scroll is provided with a thick inlet pipe and a thin inlet pipe that are set together. There are control valves on each of them; when the unit is running, according to the actual working conditions, the opening and closing of the corresponding control valve can be controlled to select the intake air from the thick intake pipe or the thin intake pipe. By selecting different intake channels, the expansion mechanism part can be realized. The intake volume is variable, and the internal volume ratio of the scroll expander is adjusted to adapt the internal volume ratio of the expander to the actual operating conditions, preventing over-expansion or under-expansion, and improving the variable working conditions of the scroll expander. Adaptability ensures the stable operation of the organic Rankine cycle generator set.

Description

technical field [0001] The present invention relates to the fields of generators and thermoelectric conversion, in particular to a scroll expander and its static scroll components and a generator set using the scroll expander, which are applied to an organic Rankine cycle system to realize the conversion of heat energy to electric energy . Background technique [0002] Expanders with structural forms such as piston expanders, rotor expanders, scroll expanders, and screw expanders are often used in small organic Rankine cycle generator sets. Among them, scroll expanders are compact, small in size, high in efficiency, and airflow Small pulsation, low noise, long life and other advantages have been widely researched and applied. The scroll expander is usually designed according to the design working conditions. The internal volume ratio of the expander is a fixed value, and its internal expansion ratio (internal expansion ratio = the K power of the internal volume ratio, K is ...

AI Technical Summary

Problems solved by technology

The scroll expander is usually designed according to the design working conditions. The internal volume ratio of the expander is a fixed value, and its internal expansion ratio (internal expansion ratio = the K power of the internal volume ratio, K is the gas constant of the working medium) cannot be adjusted. poor performance

However, during the operation of the expander, most of the actual working conditions deviate from the design working conditions, that is, the operating expansion ratio is not equal to the design expansion ratio, and it is prone to over-expansion or under-expansion.

In general, over-expansion is temporary, and the outlet pressure of the expansion mechanism of the expander will automatically rise to the exhaust pressure, but under-expansion will always exist, the heat source cannot be effectively used to recover power, and the output shaft work of the expander is greatly reduced, which is not conducive to organic Overall operation of Rankine cycle generator set

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