US2499092A - Fog nozzle - Google Patents

Description

Feb. 28, 1950 T. w. BURNAM 2,499,092

FOG NOZZLE Filed May 1.4, 1946 Patented Feb. 28, 1950 FOG NOZZLE partnership Application May 14,1945, S erial l\lo..,i69,522 I This invention relates to fog nozzles of the type employed in extinguishing fires.

The general object of the present invention is to provide an efficient form of fog nozzle of the internal impinging type.

For the purpose of extinguishing fires, there have been developed and extensively employed, nozzles (sometimes installed as stationary heads) in which there are provided one or more sets of orifices which are designed to produce streams of fluid, which streams lay in intersecting paths. The intersecting streams of fluid when the meet in a properly designed fOg nozzle result in the breaking up of the stream of fluid into fine particles which are projected outwardly from the nozzle in the form of a. so-called fog pattern, in which the individual particles of fluid are substantially uniformly dispersed. It has been found that such fog patterns are highly effective means for extinguishing many types of fire.

In most of the practical forms of fog nozzles,

the streams of water from the orifices are projected beyond the body of the nozzle before they are allowed to impinge one against the other, so that the development of the fog takes place entirely exterior of the nozzle. In certain cases, however, it is desirable to provide nozzles in which the formation of the fog takes place substantially internally of the nozzle, and in which the impinging jets impinge inside rather than exteriorly of the body of the nozzle.

Heretofore efforts to produce such internal type of impingement have resulted in nozzles operatively in action on the external impingement type, and are relatively ineflicient and unsatisfactory. The previous internal impinging nozzles have the disadvantage of excessive dripping and inadequate breaking-up of the water into uniformly small particles, and inadequate production of the desired fog from the face of the nozzle.

It is the general object of the present invention to provide a fog nozzle of the internal impingement type which is designed to overcome the difliculties previously mentioned and is capable of effecting a satisfactory generation of fog which will be uniformly distributed in a fog pattern properly projected away from the body of the nozzle without the loss of any substantial portion of the water at the nozzle and due to dripping.

The internal impingement nozzle of .the present inventionwill be fully understood from the following description of a simple example of a nozzle embodying the invention. For that purpose I have herein described the impingement type of nozzle in connection with the accompanying drawing, in which the figure is a longitudinal section.

Referring to the drawing, I have illustrated my invention in the form of a nozzle which contains one set of impinging orifices, although those familiar with the art of fog nozzles will know that while heads including only a single set of impinging orifices are employed, there are also employed many heads containing a multiplicity of impinging jets.

In the figure, 2 indicates the body which may have the substantially cylindrical walls indicated, which provide the fluid chambers 3. The walls may be threaded as indicated at 4 by means of which the fog nozzle may be attached to any desired source of fluid.

The nozzle is provided with a head member 5 which is provided with two main orifices 6 and bored along the converging paths, which paths intersect as indicated at least mainly inside of the limits of the head 5. When the orifices are arranged in the nozzle body as indicated, difflculty is experienced in the proper projection of a uniform fog away from the face of the nozzle. A great im rovement in the performance of the nozzle is obtained by providing between any pairs of converging orifices a small orifice, such as indicated at 1, preferably perpendicular to the face of the head of the nozzle. This small bore provides increased fluid pressure at a point which would otherwise be the inside point of impingement of the two larger streams. In the absence of the small bore, the nozzle has a tendency to produce a back ressure at this point. causing dri ping, and cuttin down the proper projection of the nozzle. By adding the small bore. these difficulties are overcome and the fog pattern is adequately projected away from the nozzle in a much improved manner.

The second feature utilized in overcoming the deficiencies heretofore designed in internal impingement nozzles, is in the use of the counterbore indicated at 8. Iftwo orifices, such as 5, are bored as indicated in intersecting paths overlap a sharp wedge formed at the meeting surfaces of the orifices and at the exterior face of the nozzle, there will be an elliptical pattern generated. By counterboring, as indicated at 8, from the outer face, this elliptical formation is changed into a circular discharge'hole and thereafter the Wedge shaped meeting face of the orifices is removed and the two'flat surfaces 9 provided. It has been discovered that with this arrangement the difficulty heretofore encountered in the nozzle dripping is satisfactorily overcome. I

While the particular form of the fog nozzle herein illustrated is well adapted to carry out the objects of the present invention, it is to be understood that various changes and modifications may be made, and this invention includes the modifications and, changes that come within the scope of the appended claim.

I claim:

An internal impingement fog nozzle which includes a nozzle body having a head with a plurality of converging orifices in said head, said orifices converging in the direction of the exterior of the head and partially within and partially outside the head, and a circular counterbore extending inwardly from the outer face of the head meeting the orifices at their points of intersection to provide a substantially circuliar discharge bore REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,084,359 Potter Jan. 13, 1914 1,173,279 Kinney Feb. 29, 1916 1,569,448 Banner Jan. 12, 1926 2,323,464 Glessner July 6, 1943

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