Patent ID: 8690524

Claim:
A compressor, comprising: a compressor wheel; and a compressor housing surrounding the compressor wheel and defining an inlet for leading fluid along a main flow path into the compressor wheel and through the compressor wheel to be compressed thereby, the compressor housing having a wall surrounding the main flow path and defining a port slot located adjacent the compressor wheel, the wall further defining first and second bulbs comprising bulb-shaped, generally annular hollow spaces, the first bulb being located proximate the port slot and being connected to the port slot, the second bulb being located proximate the inlet to the compressor, upstream of the first bulb, the compressor housing further defining a connection between the first and second bulbs that allows flow from one to the other in either direction; the compressor housing additionally defining a first passage into the second bulb, the first passage facing generally radially inwardly into the main flow path and allowing fluid to pass between the main flow path and the second bulb in either direction, and a second passage into the second bulb, the second passage facing generally axially towards the flow coming into the inlet such that in a choked-flow condition some fluid can enter the second passage into the second bulb, and then through the connection to the first bulb and out the port slot into the main flow path.