SYSTEM AND METHOD FOR UNLOADING A MULTI-STAGE COMPRESSOR

The unloading of multi-stage compressors may include the introduction of flow from a gas bypass from a condenser into a second-stage inlet duct to induce a swirl in the flow into second stage compression. This unloading may be performed on multi-stage compressors in heating, ventilation, air conditioning and refrigeration (HVACR) circuits that include a gas bypass from a condenser to the second-stage inlet housing of the compressor. The multi-stage compressor may include an impeller inlet duct including a flow straightener receiving fluid flow from the first stage discharge, and one or more channels to introduce gas from the gas bypass into the flow passing through the impeller inlet duct. The flow introduced by the channels may have a direction of flow including a component opposite to the direction of flow of the fluid flow from the first stage discharge via the flow straightener. 多级压缩机的卸载可以包括将来自气体旁通的流从冷凝器引入第二级进口管道，以在该流体中引起涡旋进入第二级压缩。该卸载可以在供暖、通风、空调以及制冷(HVACR)回路中的多级压缩机上执行，该回路包括从冷凝器到压缩机的第二级进口壳体的气体旁通管路。所述多级压缩机可