Multiple-capacity centrifugal compressor and control method thereof

Abstract

The present disclosure relates to a multiple-capacity centrifugal compressor, which includes a plurality of capacity-control mechanisms. Each of the capacity-control mechanisms includes an inlet guide vane and an outlet diffuser, so that the multiple-capacity centrifugal compressor provides a flexible control strategy. In addition, the present disclosure further provides a method for controlling the multiple-capacity centrifugal compressor that effectively adjusts and controls the capacity-control mechanisms by coarsely adjusting the inlet guide vanes and combined with subsequently adjusting the outlet diffusers.

Description

technical field [0001] The invention relates to a centrifugal compressor, in particular to a multi-capacity adjustable centrifugal compressor applied to a chiller and a control method thereof. Background technique [0002] The common refrigeration equipment in today's central air-conditioning system is the chilled water host, which uses the chilled water produced by the chilled water host to be transported through the pipeline to achieve the effect of significantly reducing the indoor temperature by means of heat exchange. In recent years, the use of chilled water hosts has become more and more common. One of the common types is the centrifugal chilled water host, and the core of its operation is the centrifugal compressor. In order to achieve the purpose of energy saving, the centrifugal compressor with multi-stage design has become a trend at present, but the compressor with multi-stage design may generate non-proportionality in load control, which makes the capacity adjus...

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Problems solved by technology

However, this type of control method can use fewer variables, so the control strategy is too poor, which limits the performance of COP, and cannot provide wide-area operation and satisfy partial load operation

[0007] It can be seen that, based on the existing technology, it is difficult to achieve wide-area operation and satisfy partial load operation when adjusting a group of intake guide vanes and diffusers, and the existing multi-capacity adjustment technology is also difficult to design. A centrifugal compressor that improves the efficiency of the whole unit and suppresses surges

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