Inventors:
Robert A. Wilke - Winona MN
James M. Grupa - Dodge WI
Assignee:
Lake Center Industries, Inc. - Winona MN
International Classification:
F04F 548
Abstract:
A passive aspirator based on the Venturi effect has a pivotable flap in the inlet portion of a first air passage. The flap reduces the air flow through the passage when high pressure is present. A spring biases the flap toward an open position. Increasing air flow overcomes the spring force and tends to close the flap. This variable-volume flow allows use of a large enough passage to aspirate sufficient air at low flow rates but does not produce excess waste air at high flow rates.