Automotive vacuum system for e.g. fuel tank filters

摘要

The nozzles (4) parallel to the flow direction (S) expand from their narrow entry and have intake orifices (15) at their narrowest point connected to a common vacuum line (18). The nozzle section climbs from its narrow end to its expanded end so the size of the sectional areas at the nozzle entries equals that of the nozzle outlets. The intake orifices are ring shaped and extend right round the nozzle at its narrowest part. Several nozzles are of a honeycomb shape and fill out the entire region of the flow channel and some nozzles are circular in section at their entry and outlet, or again are of hexagonal section at these points. The nozzles retain constant section over their length and individual nozzles (4) have a constant section sector directly after their entry only to expand to their outlet.