Variable-expansion-ratio and high-temperature-resistant silencing diffuser of axial-flow turbine

Abstract

The invention discloses a variable-expansion-ratio and high-temperature-resistant silencing diffuser of an axial-flow turbine. The silencing diffuser comprises an outer shell and an inner shell, the outer shell is an inverted-truncated-cone-shaped cylindrical body, an inner flange and an outer flange used for connection are arranged at the bottom of the outer shell, the inner shell is an inverted-truncated-cone-shaped cylindrical body which is defined by a plurality of son-mother plates in a lap joint mode and can be folded and unfolded, and an outer eave is arranged at the top end of the inner shell; the inner shell and the outer shell are coaxially installed in the outer shell in a penetrating mode, the outer edge of the top end of the inner shell covers and presses the end surface of the top end of the outer shell, the bottom end of the inner shell is fixedly connected to an annular inner flange arranged at the bottom end of the outer shell through a spring hinge, an annular cavity is formed between the outer shell and the inner shell, a sound absorption material is arranged on the inner wall of the outer shell, and a plurality of through holes are formed in the son-mother plates. According to the silencing diffuser, the expansion ratio can be adjusted, the efficiency of the turbine during variable working condition operation can be effectively improved, and meanwhile, the noise problem of the turbine can be solved.

Description

technical field [0001] The invention relates to an axial-flow turbine sound-absorbing diffuser, in particular to an axial-flow turbine variable-expansion-ratio high-temperature-resistant sound-absorbing diffuser, which belongs to the field of power equipment performance improvement. Background technique [0002] In recent years, with the increasingly stringent requirements for the control of internal combustion engine exhaust emissions and energy conservation, supercharging technology has been greatly developed. The single-stage axial-flow turbine usually used in the turbocharger requires the minimum aerodynamic loss for every gas-passing component from the turbine intake shell, nozzle ring, moving vane to the turbine exhaust shell. However, the gas at the outlet of the turbine rotor blades has a high velocity. If it is not utilized, it will be lost in the form of kinetic energy, which is commonly known as the residual speed loss of the turbine. And the larger the expansion ...

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Problems solved by technology

[0006] The adjustable expansion ratio structure designed by the present invention, and the high-temperature-resistant sound-absorbing material and the perforated plate are used to construct the impedance compound noise-absorbing structure, which can effectively improve the efficiency of the turbine when it is running under variable working conditions, and can also improve the noise of the turbine.

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