US 3009529 A
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Nov. 21, 1961 D. R. BROWN AIR NOZZLE Filed Aug. 7, 1958 FIG. 2
3,009,529 AIR NOZZLE Donald R. Brown, Downers Grove, Ill., assignor to Western Electric Company, Incorporated, New York, N.Y., a corporation of New York Filed Aug. 7, 1958, Ser. No. 753,704 1 Claim. (Cl. 181-33) This invention relates to air nozzles and more particularly to air nozzles having low noise characteristics.
One of the disadvantages of the conventional air nozzle is that this type of nozzle produces an excessive amount of noise.
One of the objects of this invention is to provide an improved air nozzle.
Another object of this invention is to provide an air nozzle which produces a reduced amount of noise by dissipating a major portion of the normally expected sound energy at ultra-sonic frequencies.
A further object of this invention is to provide an air nozzle having turbulating and baffling portions leading to an exhaust opening in the nozzle in order that a major portion of the sound created by the nozzle is at ultrasonic or inaudible frequencies.
One embodiment of the present invention contemplates an air nozzle having a flattened air exhaust port interconnected to an intake port by an enlarged turbulating chamber and an apertured bafiiing member, the turbulating chamber and baffling member serving to reduce the amount of sound energy dissipated at audible fequencies.
Other objects and advantages of the invention will become apparent by reference to the following detailed description and the accompanying drawing illustrating a preferred embodiment of the invention, in which FIG. 1 is a top view of an air nozzle embodying the principles of the present invention; with a portion broken away to show the configuration of a baffling disc;
FIG. 2 is a side view of the air nozzle illustrating the configuration of the path through which air travels through the nozzle; and
FIG. 3 is an end view of the nozzle showing the configuration of the exhaust port.
Referring now in detail to the drawing, an air nozzle, designated generally by the numeral 11, is shown made up of a tapered block 12 and a plate 13 secured to a flat face 14 of the block by screws 15. The block 12 is provided with an intake port 17 through which air enters from a supply tube 20. The intake port 17 communicates with a cylindrically-shaped turbulating chamber 21 extending from the face 14 into the block 12.
A baffling disc 25, having a plurality of spaced apertures 26, is positioned in a recess 27 in the block 12 adjacent to the chamber 21. The disc 25 is provided with a flange 28 which engages the plate 13 for holding the disc in place. The apertures 26 in the disc 25 permit air to escape from the chamber 21.
A slot 31, having a rectangular configuration and a bottom flush with the disc 25, extends from a forward end of the block 12 and terminates at the recess 27 for serving as an exhaust port, the plate 13 serving as one wall of the port. The slot 31 is interconnected with the turbulating chamber 21 through the apertures 26 in the bathing disc 25.
In operating the air nozzle 11, compressed air is forced from the tube 20 through the intake port 17 into the States Patent "ice turbulating chamber 21, this chamber having a greater cross-sectional area than the intake port 17 so as to appreciably decrease the velocity of the air entering from the tube 20. The air passes from the chamber 21 through the apertures 26 in the disc 25 and exits from the nozzle 11 through the slot 31 serving as an exhaust port. The major portion of the sound created by the compressed air passing through the nozzle 11 is in the ultra-sonic range of frequencies, thereby materially decreasing the amount of sound energy dissipated at audible frequencies.
It is to be understood that the above-described arrangements are simply illustrative of the application of the principles of this invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.
What is claimed is:
A nozzle for discharging compressed air with a reduced amount of audible noise, which comprises a body member having a flat face, a cylindrical turbulating chamber extending inwardly and perpendicularly from said face, an elongated shallow slot of uniform depth and width formed in said face extending from one end of the body member to said chamber, and an inlet passage extending from the opposite end of the body member into direct and unobstructed communication with the turbulating chamber at a right angle to the axis thereof, a perforated bathing disc mounted across the opening of the chamber in said face and seated flush with the bottom of the slot, said disc being provided with a plurality of restricted openings designed to connect the chamber and the slot and disposed with their axes parallel to the axis of the chamber and perpendicular to the bottom of the slot, and a cover member having a flat face contacting the fiat face of the body member and secured thereto so as to cover the slot and form a restricted outlet channel having a uniform cross section throughout its length and a cross-sectional area substantially less than that of the inlet passage and the turbulating chamber, the cross-sectional area of the turbulating chamber being greater than that of the inlet passage, whereby a stream of compressed air enters the turbulating chamber from the inlet passage, decreases in velocity, increases in turbulence, is subsequently broken up into a plurality of high-velocity streams which issue from the restricted orifices in the disc, and the highvelocity streams are then forced to make abrupt rightangle bends and to recombine upon entering the restricted outlet channel so that the air is discharged with a reduced amount of audible noise.
References Cited in the tile of this patent UNITED STATES PATENTS 744,437 Thurman Nov. 17, 1903 1,424,795 Bannon Aug. 8, 1922 1,546,920 Douglass July 21, 1925 1,708,002 Warhus Apr. 9, 1929 1,919,365 Gilsenan July 25, 1933 1,936,413 Stillson Nov. 21, 1933 2,059,898 Osborne Nov. 3, 1936 2,325,905 Caulfield Aug. 3, 1943 OTHER REFERENCES Noise Control, publication, July 1955, vol. 1, No. 4, pages 37-41 and 54.
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