Fluid sprinkling – spraying – and diffusing – Unitary plural outlet means – All in a single straight line
Patent
1987-01-28
1988-08-30
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
Unitary plural outlet means
All in a single straight line
239567, 239568, B05B 114
Patent
active
047670614
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This United States application stems from PCT International Application No. PCT/SE86/00263 filed June 5, 1986.
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention concerns a blowing nozzle for a highly pressurized gaseous fluid comprising at least two narrow exhaust passages having a width insignificantly larger than the size of particles, occurring in said fluid.
Description of the Prior Art
Blowing nozzles are used for various industrial purposes, e.g. to blow away cuttings from a boring and other debris from a workpiece, to cool during welding or other kind of heat generating work, as exhausts from pneumatic machines, or for drying of paint.
A major problem with these devices is the risk of the noise level becoming hazardous, when a high blowing power is needed. Noise levels around 113 dB (A) are not uncommon for blowing nozzles with high output.
Noise reducing blowing nozzles are known, e.g. from Swedish patent application No. SE 7806883-0, which has several small circular passages. These small passages must be drilled with a very high degree of precision, in order to achieve the desired noise reducing effect. Because of the necessity for a high degree of precision these nozzles are comparatively expensive to manufacture. At the same time the blowing force possible with one of these nozzles is limited, which means that several nozzles must be mounted in parallel in order to reach a desired large blowing force. This means that these noise-reducing blowing nozzles in many cases are a very expensive solution to the noise problem.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is therefore to produce a cheap and efficient nozzle with noise reducing properties, and by which it is possible to reach a considerably larger blowing force for a given frontal area, compared with corresponding known blowing nozzles.
The invention is characterized in that the exhaust passages are slot-formed, each having a length, no more than ten times the average width of each slot, and that they extend in parallel or radially over the end surface of the nozzle, in a projection perpendicular to its longitudinal axis.
According to one advantageous embodiment of the invention, the depth or axial length of each slot-formed exhaust passage is at last five to ten times the length of said slot.
Preferably several exhaust passages are formed in parallel with the longitudinal axis of the nozzle in a central body, which is surrounded by a casing.
According to another advantageous embodiment of the invention the nozzle has a circular front with exhaust passages radially arranged concentrically around a common longitudinal axis, wherein the slot-formed exhaust passages are arranged with a minimum individual distance (distance between centers) of three times the slot width.
Preferably, the passages, as seen along their longitudinal axis, diverge radially outwardly with respect to the surrounding casing. Preferably, the central body protrudes from the casing in order to increase coejection of atmospheric air surrounding the nozzle.
A nozzle having a rectangular front and parallel exhaust passages preferably has a distance between passages that is at least three times the square root of the product of slot length multiplied by the slot width .
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in the following in greater detail with reference to the accompanying drawings, wherein:
FIG. 1 is an end view of a circular nozzle according to a first embodiment of the invention;
FIGS. 2a and 2b are cross-sectional views taken along line II--II in FIG. 1 showing two different embodiments of the invention;
FIG. 3 is an end view of a second embodiment of a circular nozzle of the invention;
FIG. 4 is an end view of a rectangular nozzle according to the invention;
FIG. 5 is a cross-sectional view taken along line V--V in FIG. 4;
FIG. 6 is a cross-sectional view taken along line VI--VI in FIG. 7;
FIG. 7 is a side elevational view of another embodi
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patent: 2407349 (1946-09-01), Shaw
patent: 2570972 (1951-10-01), Nakken
patent: 3606169 (1971-09-01), West
patent: 3865311 (1975-02-01), Paxhia et al.
patent: 4204631 (1980-05-01), Hruby, Jr.
Ingemanssons Ingenjorsbyra AB
Kashnikow Andres
Merritt Karen B.
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