US2992777A - Spray nozzle - Google Patents

Description

rkv

July 18, 1961 s. P. KINNEY EIAL SPRAY NOZZLE Filed Oct. 4, 1957 INVENTORS SELWYNE P. KINNEY. WARD W. CLARKE. HUGH B. CARR.-

Y w, M M./

ATTORNEY,

United States Patent SPRAY NOZZLE Selwyne P. Kinney and Ward W. Clarke, Pittsburgh, and Hugh B. Carr, Carnegie, Pa., assignors to S. P. Kinney Engineers, Inc., Carnegie, Pa., a corporation of Pennsylvania Filed Oct. 4, 1957, Ser. No. 688,372 6 Claims. (Cl. 239-416) This invention relates to a so-called spray nozzle, and more particularly, to an improved unitary device of this type for assembly within the duct leading from the dry dust collector of a blast furnace to the gas washer, the nozzle being located in advance of a venturi'shaped orifice in the duct, and similar locations where exposure to the environment and use makes the use of presently available nozzles objectionable.

One of the principal objects of this invention is to provide a spray nozzle constructed of abrasive-resistant material such as cast manganese steel which, being too hard to be machined, is provided with an interior basket and a nozzle liner that are constructed of machinable corrosion-resistant bronze or like metal.

Another object of the invention is to provide a quickly removable exterior nozzle element to thereby facilitate assembly of the operative flow control elements and an interior nozzle liner positioned therein.

A further object of the invention is to cast the elongated body portion of the nozzle in the form of a modified teardrop, with the wall that is directed toward the onfiowing stream of gas being relatively thick and substantially at the medial line thereof converging into a portion having walls of a decreasing thinner area and thence terminating into a longitudinally extending web along the opposite wall which strengthens and rigidities the entire conduit.

A still further object of the invention is to mount the fluid flow control means and self-cleaning mechanism within the nozzle body.

An important object of the invention is to providean improvement in the valve disclosed in Patent No. 2,647,799, granted August 4, 1953, to Selwyne 'P. Kinney.

Other objects and advantages of the invention will become apparent from the following description.

In the drawing there is shown a preferred embodiment of the invention. In the drawing:

FIG. 1 is a sectional view of a spray nozzle constructed in accordance with the principles of this invention;

FIG. 2 is a front horizontal view of the exterior nozzle and its mode of attachment to the conduit housing; and

FIG. 3 is a sectional elevation taken on the line 3--3 of FIG. 1.

Referring to the drawing, and more particularly FIG. 1, there is illustrated a spray nozzle terminal 1 provided with an annular convergent area 2 and an orifice 3. The upper portion of the nozzle terminal 1 has an annular olfstanding flange 4 (FIG. 2) and includes diametrically opposed cut-out portions 55 that are arranged to re- ,ceive complemental depending horizontally apertured ears 6-6 integrally formed as a part of the main body housing 8 of the nozzle, these ears projecting from a downturned extension 9 at the distal end of the body 8. Viewing FIGS. 1 and 3, it will be observed that wedges 7- 7 are inserted through the horizontally apertured ears 6-6 and thus aflix the nozzle housing 1 to the main body or conduit 8. I a

2,992,777 Patented July 18, 1961 By referring to FIG. 3 it will be noted that the main body or housing portion 8 is constructed of abrasiveresistant metal which is of such hardness that it cannot be machined. A metal such as cast manganese steel is especially useful because of the long service it will give under extremely erosive conditions. It is of generally tear-drop section and, as shown, that part above the medial area thereof is of substantially thicker construction than that lying therebeneath. Typically the nozzle may be used in the duct which carries blast furnace gas from the primary dust collector to the washer. In an environment such as this, the gases may be travelling at a rate of anywhere from 60,000 to 100,000 cubic feet per minute and the dust particles contained in the gas have an extremely abrasive action. An overall tear-drop shape streamlines the gas flow around the body, and the heavy wall thickness contributes to the securing of this shape while at the same time vastly increasing the longevity of the nozzle without greatly adding to its weight. Extending horizontally beneath the conduit 3 from the right angle portion 9 thereof and abutting against an apertured closure plate 10 is an integral depending web 11 which compensates for unequal thermal stresses due to the heavy wall section at the top, but contributes to the overall tear-drop effect thereof such as to better streamline the flow of the gases carrying the particulate abrasive material. The nozzle has a mounting plate 10 to support it near its outer end in the structure in which it is placed, the inlet end 12 of the body projecting through a conformed aperture 13 in the plate 10. Any suitable means that may prove most convenient for securing the conduit in the aperture 13 of the closure plate 10, may be utilized. With reference again being had to the nozzle housing 1 and the manner of aflixing it by means of the wedges to the conduit or housing 8, obviously such a locking arrangement could be resorted to, if desired, although it is here shown as being welded.

The apertured closure plate 10 is held in spaced relation to the exterior wall 14 of the downcomer or other duct in which it is mounted, indicated generally as D, by means of an annulus 15 secured by a friction fit or otherwise, within an aperture 16 therein. The annulus 15 is in turn provided with a plurally apertured flange 17 which may be welded or otherwise secured thereto, as shown at 1818. The plate 10 is complementally apertured as at 19-19 to conform to annular flange 17 and thereby adapted to receive the bolts 2020. It is to be understood, from examining FIG. 1, and that portion thereof more particularly just described, that although only two bolts can be seen, a plurality thereof are arranged about and adjacent to the periphery of this plate. Since blast furnace gas is not only combustible, but because of its high content of carbon monoxide, is noxious, the mounting must be gas-tight, but one which enables ready removal if necessary.

Aifixed to the inlet end 12 of the conduit 8 is a T- shaped fitting 12a, forming in effect a continuation of the tubular body 8, and it has a perpendicular leg 12b to which a water supply conduit (not shown) may be connected. The end of the tubular fitting remote from the inlet 12 is provided with a closure plate 21 that is axially apertured as at 22. A bushing 23. is fastened in any suitable manner within the aperture 22 and is provided with a packing 24. Pressure applying means is shown at 25 for exerting suflicient pressure on the packing to prevent leakage of the incoming water about the shaft 26, the

structure being a simple gland packing. The ofistanding leg of the T-shaped fitting is also provided with an apertured flange 27, the apertures thereof being complemental to those provided in the plate 21 and therefore adapted to be secured together by bolt means such as shown at 28. The end of the shaft 26 which extends through bushing 23 is threaded as at 29. A thrust collar surrounds the projecting end of the shaft, and it has openings therein to afford access to the gland. It carries a disk 31 at its outer end. In it is secured bearing 32 which is secured to the hub 33 of a hand-wheel 34 by bolts 32. The hub of the handwheel is threaded on the shaft, and may be remotely operated by a chain 36 engaging its periphery. It will be readily understood that by pulling upon either end of the chain 36, wheel 34 will be rotated and as a consequence of the aforementioned bearing construction 32 the threaded rod or shaft 26 may be reciprocated within the conduit 8, for a purpose now to be described.

The vane structure of the nozzle is of the general construction shown in Patent No. 2,647,799 above referred to.

By referring to the nozzle construction, it will be noted, particularly in FIG. 1, that the deflector vane or swirler DV, which forms no part per se of this invention, is secured to the threaded stub shaft 37, the upper free end of which is threadedly engaged into the base of the clevis 38. A cylindrical bronze basket or cage 39 having a plurality of elongated apertures 40 to permit water to pass therethrough is provided with a depending annular flange 41. An annular groove 42 provided in the base of basket 39 corresponds with an annular upstanding rib 43 carried at the upper edge of the inner bronze nozzle liner 44. It will be observed that the periphery of basket 39 is complemental to the inturned shoulder S of the right angle portion of the housing and will thereby be held in relative fixed position by a friction fit until the exterior nozzle housing 1 and its liner 44 are aligned with the depending ears 6-6 and the locking wedges 77 are passed therethrough, thereby forming an integrated assembly.

Reverting to the clevis 38, it will be apparent that pin 46 carried by the clevis 38 extends through the slotted portion 47 of a bell crank 48. The bell crank 48 is provided with a pivot pin 49 passing through an car 50 forming a part of the basket '39. The upwardly extending end of the bell crank 48 is provided with a pivot pin 51 in a clevis 52. The end of the shaft 26 is screwed into said clevis 52 and a set screw 53 is thereupon threaded into the clevis 52 and set against the threads of shaft 26 to prevent rotation thereof.

From the description thus far, it will be understood that when it is desired to create a spray through the nozzle 44 the deflector valve assembly DV is in the position as shown in full lines in FIG. 1. However, upon actuation of the chain wheel 34 the rod or shaft 26 may be retracted until stop 54, which is fastened by means of a set screw 55 to shaft 26, is brought into abutting relation with the face of bushing 23. Obviously, then the vane assembly will be lifted for cleaning and flushing the nozzle, as explained in Kinney Patent No. 2,647,799 above referred to. With the present construction the bell crank is mounted within the basket which is large enough to give it the required freedom of movement. Assembly of the parts within the nozzle housing is made possible by the removable nose portion 2. The rod and bell crank are inside the valve where they are protected from the erosive action of the gases.

While we have illustrated and described one specific embodiment of our invention, it will be understood that this is merely by way of illustration, and that various changes and modifications may be made therein within the contemplation of our invention and under the scope of the following claims.

We claim:

1. A spray nozzle for use in a gas stream comprising an elongated tubular body having a mounting plate at one end and an angular extension at its opposite end, a nozzle member removably secured to said extension and terminating in a discharge orifice, a separate replaceable liner in said nozzle member, an apertured basket member in the tubular body retained in place by the nozzle member, a swirler in the nozzle, an operating extension on the swirler, movable means carried by the basket connected to the opera-ting extension for reciprocating the swirler, and an operating rod connected to said movable means and extending axially through the tubular body for effecting reciprocable movement of the swirler, means for introducing liquid into the tubular body, an end closure for the tubular body at that end thereof which is remote from the nozzle, and means at said end of the tubular body accessible at the exterior of the tubular body for effecting movement of said rod.

2. A spray nozzle for use in a conduit carrying gas containing dust particles comprising a tubular body of abrasive-resistant alloy, said body being open at its outer end and having a mounting flange projecting radially therefrom near said outer end, the inner end of the body having an integral right-angle extension open at its free end, said extension having an internal shoulder adjacent the open end, a hollow cage inside the extension projecting up into the tubular body from said open end, the cage having a projection thereon seated against said internal shoulder for positioning the cage in the extension, a removable nozzle in the open end of said extension and forming a continuation thereof, the nozzle abutting against the cage, means on said extension exteriorly of the nozzle for holding the nozzle and the cage in place in the open end of the extension, a swirler inside the nozzle and cage having an operating stem extending axially within the cage for moving the swirler toward and away from the open end of the nozzle, a bell crank pivotally mounted in the cage having one end connected with the operating end of the swirler, the outer end of the tubular body having a water inlet fitment thereon exteriorly of said mounting flange, an operating rod connected to the bell crank and extending axially within said body through said water inlet fitment, and means at the exterior of the fitment for reciprocating said operating rod to thereby move the swirler.

3. A spray nozzle as defined in claim 2 wherein the extension on the nozzle has lugs extending therefrom at its open end, the nozzle having a flange through which the lugs extend and transverse wedge keys passing through the lugs and bearing against the flange constituting the means for holding the nozzle in place in the extension.

4. A spray nozzle as defined in claim 2 wherein the extension on the nozzle has lugs extending therefrom at its open end, the nozzle having a flange through which the lugs extend and transverse wedge keys passing through the lugs and bearing against the flange constituting the means for holding the nozzle in place in the extension, the nozzle and the body being castings formed of an abrasive-resistant alloy.

5. A spray nozzle as defined in claim 2 wherein said tubular body has the wall thereof along that side which is opposite the direction in which the nozzle is directed thicker than the opposite wall, the said opposite wall having a rib extending along the exterior thereof from the mounting flange to the right-angle extension whereby the body is of modified teardropsection and thermal stresses between the thick and thin wall portions of the body are substantially eliminated.

6. A spray nozzle as defined in claim 2 wherein the said water inlet fitment comprises a T having a bar portion in axial alignment with the tubular body and having a right-angle extension for connection with a source of water supply, the operating rod extending through the bar portion of the T, the end of such bar portion opposite the tubular body having a cover plate secured thereto, said cover plate having a packing gland at the center thereof, the operating rod extending through said gland, said means for operating the rod being located beyond 5 said cover plate and gland and being carried on the outside of said cover plate.

References Cited in the file of this patent UNITED STATES PATENTS Gifford Dec. 14, 1920 Mock et al. Feb. 16, 1943 Spenle Oct. 19, 1943 Kinney et a1 Mar. 4, 1952

Images