Centrifugal compressor with rotary self-adaptive variable-geometry vaned diffuser

Abstract

The invention relates to a centrifugal compressor with a rotary self-adaptive variable-geometry vaned diffuser. The centrifugal compressor comprises a volute (1), an end wall (8), an air duct (3), diffuser vanes (2), compressor vanes (5), an impeller (6) and a diffuser disc (4), wherein the diffuser vanes (2) are fixedly connected to the diffuser disc (4). The end wall (8) of the volute (1) is provided with a groove (7). The diffuser disc (4) is embedded into the groove (7). The diffuser disc (4) and the end wall (8) of the volute (1) are arranged in a separated mode. By adoption of the centrifugal compressor, the relative angles between air flow and the diffuser vanes (2) are changed through self-adaptive rotation of the diffuser disc (4) according to the specific working condition of air flow at an outlet of the impeller (6), the problem that the geometrical parameter of a common centrifugal compressor in an off-design working condition point cannot be changed according to requirements of an actual working condition is solved, and the efficiency of the diffuser is improved.

Description

technical field [0001] The invention belongs to the technical field of turbocharging, and in particular relates to a centrifugal compressor with a rotary self-adaptive variable geometry vane diffuser. Background technique [0002] The air flow at the outlet of the impeller of the centrifugal compressor has a large kinetic energy, and the vane diffuser can convert the kinetic energy into pressure energy to further increase the air pressure. Vaned diffusers are usually designed according to the design operating point of the compressor, but at non-design operating points, due to changes in the airflow conditions at the outlet of the impeller, if the geometric parameters of the vaned diffuser are not changed, the efficiency will be significantly reduced. Therefore, it is necessary to design the variable geometry vaned diffuser according to the working conditions of the compressor. [0003] Existing vane diffusers with variable geometry often use active control methods, which re...

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Problems solved by technology

[0003] Existing vane diffusers with variable geometry often use active control methods, which require a complex mechanical structure to adjust the angle of the diffuser blades. Because the blade adjustment mechanism is too complicated, it often requires a large space, and when transient changes Slow response, unable to effectively improve diffuser efficiency

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