Venturi muffler with variable throat area
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsClyde A. Morehead, John W. Henry, V
Life of this patent
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Abstract
The invention is directed to a muffler for a gas flow at a gas intake of a achine. The muffler includes at least one venturi nozzle cooperating with a chamber. Each venturi nozzle has an inlet opening, an outlet opening and a throat therebetween. The chamber has a chamber inlet connected to either the inlet opening or the outlet opening of each venturi nozzle. The chamber has a chamber outlet connected to the gas intake of the machine. Some embodiments of the invention feature variation of the total throat area of the muffler. Other embodiments of the invention feature variation of the volume enclosed by the chamber.
Claims13
A muffler for connecting to a gas intake of a machine which produces noise while taking in a gas flow through said gas intake, said muffler comprising:
- a venturi nozzle having an inlet opening, an outlet opening and a venturi throat therebetween, said venturi throat defining an approximately circular cross-sectional throat area, said venturi nozzle including flexible elastic material;
- a chamber having a chamber inlet and a chamber outlet, said chamber inlet connected to one of said inlet opening and said outlet opening, said chamber outlet connected to said gas intake;
- and
- an adjustable collar for varying said approximately circular cross-sectional throat area, said adjustable collar surrounding said venturi throat.
A muffler for attenuation of low frequency noise at a gas intake of a machine, said machine being of the type requiring a known volume of a gas at said gas intake during an intake cycle of said machine, the noise arising during each said intake cycle, said muffler comprising:
- at least one venturi nozzle, each said venturi nozzle including, as particular thereto, an inlet opening, an outlet opening a throat passage between said inlet and outlet openings which defines a cross-sectional throat area, a converging section between said inlet opening and said throat passage, and a diverging section between said throat passage and said outlet opening;
- a total throat area associated with said muffler, said total throat area being defined by the sum of every said cross-sectional throat area, each said cross-sectional throat area being defined by said throat passage particular to one said venturi nozzle;
- means for varying said total throat area;
- and
- a chamber having a chamber inlet and a chamber outlet, said chamber inlet being connected to one of said inlet opening and said outlet opening which are particular to each said venturi nozzle, said chamber outlet being connected to said gas intakes;
- wherein a flow of said gas reaches said gas intake by sequentially passing from each said inlet opening which is particular to one said venturi nozzle, through each said venturi nozzle, through each said outlet opening which is particular to one said venturi nozzle, through at least a portion of said chamber, and through said chamber outlets;
- wherein at least one said venturi nozzle is made of a flexible elastic material and has a particular said throat passage which is approximately circular in cross-section;
- and
- wherein said means for varying said total throat area includes at least one adjustable collar, each said adjustable collar being for varying one said cross-sectional throat area, each said adjustable collar surrounding one said throat passage which is approximately circular in cross-section and which is particular to one said venturi nozzle which is made of a flexible elastic material.
A muffler for attenuating noise of a machine having a gas intake, said muffler comprising:
- at least one venturi nozzle having a throat portion axially intermediate an inlet opening and an outlet opening, said throat portion defining a cross-sectional throat perimeter which bounds a cross-sectional throat area;
- a chamber having a chamber inlet and a chamber outlet, said chamber engaging each said venturi nozzle by connecting said chamber inlet to either of said inlet opening and said outlet opening, said chamber engaging said machine by connecting said chamber outlet to said gas intake;
- and
- means for structurally altering at least one said throat portion so as to modify said cross-sectional throat perimeter which said throat portion defines and thereby vary said cross-sectional throat area which said cross-sectional throat perimeter bounds.
Dependencies are inferred from the claim text.