Impeller auxiliary structure for overspeed test of cantilever centrifugal expanderimpeller

Abstract

An impeller auxiliary structure for an overspeed test of a cantilever centrifugal expander impeller comprises an impeller, an auxiliary shaft and a locking nut; the auxiliary shaft is a stepped shaft, the stepped shaft comprises a first shaft section with the large outer diameter and a second shaft section with the small outer diameter, a shaft shoulder is formed between the first shaft section and the second shaft section, and the shaft shoulder abuts against the rear end of the impeller; the second shaft section penetrates through the center hole of the impeller, and the locking nut is spirally connected with the second shaft section and abuts against the front end of the impeller; and the diameter L1 of the impeller is larger than the length L2 of the auxiliary shaft, the length L4 of the first shaft section is smaller than L1 / 2, and the outer diameter L5 of the first shaft section is smaller than the thickness L3 of the impeller. The vibration of the cantilever centrifugal expander impeller during the overspeed test can be reduced, so that the overspeed test of the impeller can be completed safely and efficiently.

Description

technical field [0001] The invention relates to expander technology, in particular to the overspeed test technology of cantilever centrifugal expander impeller. Background technique [0002] Due to its high speed and high efficiency, the impeller expander has been continuously expanded in low-temperature refrigeration, energy recovery and other application fields. The most widely used impeller expanders are centripetal. The impellers of centripetal expanders are mature in technology and light in weight, but they are not suitable for some working conditions with liquid. Therefore, in recent years, centrifugal expanders with high enthalpy drop and phase change conditions have been developed and applied. Compared with the radial impeller, the impeller of the centrifugal expander has shorter blades and a larger diameter. Due to the limitation of the structural strength, the impeller needs to be thickened. Even if the low-density titanium alloy material with excellent material s...

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Problems solved by technology

[0003] Compared with the centripetal impeller or centrifugal compressor impeller, the impeller of the cantilever centrifugal expander is thicker. When the impeller of the cantilever centrifugal expander is overspeed tested, the vibration of the impeller is relatively large, and the phenomenon of the test equipment alarming and shutting down often occurs , affecting the normal progress of the overspeed test

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