AU698298B2 - Nozzle - Google Patents

Description

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APPLICANT:

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FILING DATE: SPRAY NOZZLE ENGINEERING PTY. LIMITED PN 0335/94 29/12/94 Invention Title: NOZZLE The following statement is a full description of this invention, including the best method of performing it known to me/us: I 2 This invention relates to a nozzle and particularly to a spray nozzle for use in applications where extreme temperatures are met by the nozzle.

Nozzles of the type to which this spec. ficaLion will refer are a commodity item used in very large numbers and can be threaded directly into pipe, or to attachments to which pipes

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are connected to provide a fine spray and in a conventional c application there can be a substantial number of these nozzles S along a particular length of pipe-work.

The nozzles themselves can vary from nozzles which are very S small, having an overall body diameter of the order of 1 t centimetre up to nozzles which are substantially larger than C C this.

In practice the nozzles may be turin j- from a metallic rod, I normally brass but possibly stainless steel, or are cast and later milled. In order to ensure good distribution and spray pattern from the nozzle it is quite usual that the line end of the nozzle is counter-bored and receives an insert which can, for example, impart a rotatory motion onto the fluid as it passes into the nozzle.

D: \WP5S\SPEC\SPnRANOZ.CAP\ATKM\28 December, 1995 -C r' -I- 3 These inserts may be cast or machined and are normally a frictional fit within the nozzles.

Such nozzles are quite satisfactory in general use. There are, however, situations where the conventional nozzles are less than satisfactory and one of these is where the nozzles are used to spray very hot materials. In one such application the nozzles may be used to spray a liquid onto a metal rod or t S sheet before rolling where the metal is "red hot".

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For the liquid to reach the surface of the metal it is necessary that the nozzles be located very close to the i surface and in practice it has been found that the expansion of the nozzle tends to be differential so that the inserts are Sno longer held within the nozzles but are in effect basically 1 free floating.

V,4 t S* If there then happens to be any form of reverse pressure, either because of a fluctuation in the fluid line pressure or possibly even through evaporation of liquid in the nozzles, or i should there be any physical movement as by vibration or hammer in the pipes, then the insert can leave the nozzle and pass into the line.

u D: \WPS1\SPEC\PSAyNOZ. CAP\AT. KH\28 December, 1995 I _r Lb--C LY I__II I II 0* 4 O* 4 If this occurs then there can be a partial blockage of the line or of a particular other nozzle, if the insert stops in the line, and in order to correct this the spraying operation has to be stopped, the insert has to found and removed and, of course, the faulty nozzle has to be replaced.

Where the system is being used in a time critical situation, such as with a steel rolling mill, this can be extremely expensive as the line may have to be stopped for repair.

*9 It is thus the object of the present invention to provide a nozzle having the various characteristics of the previously described nozzles but in which the likelihood of the insert being displaced is minimised with the modification being sufficiently shaped that it can readily be applied to all nozzles of the type, if required, so that the wholesaler or user of nozzles does not have to maintain separate stocks of nozzles which incorporate the feature of the invention and those which do not.

The nozzle of the invention includes a metallic nozzle having a counter-bore from one side thereof into which a component to control the spray is located characterised in that the end of i the counter-bore is peened over or otherwise worked to prevent movement of the component.

\HP51\SPECSPRAYNOZ.CAP\AT.KM\15 September, 1998 CT0 KQyi L J- I IL IL=l I In particular form of the invention the lip of the end of the counter-bore is shaped during manufacture to be tapering towards the end of the lip and a circular die or the like is used to form the whole of the lip so as to retain the insert whilst at the same time providing no specific intrusion which can adversely affect fluid flow in the line.

V C t C r tt C' In order that the invention may be more readily understood we shall describe embodiments of the nozzle made in accordance S with the invention in relation to the accompanying drawings, in which: S* Fig 1 is a perspective view of the nozzle from the rear; VY 0 Fig 2 is a cross sectional view of the nozzle before peening; t Fig 3 is a cross sectional view of the nozzle after peening; Fig 4 is a view of a spray assembly using nozzles as shown in Figs 1 to 3; Fig 5 is a cross-sectional view of a form of nozzle in which an insert is located; and Fig 6 is a cross sectional view of an alternative form of nozzle with a ceramic insert.

51\SPEC\SPRA Z.c \AT. \2 ecember, D: \WpS1\SPEC\SPRMNOZ.CAP\AT. K\2B Deceniber, 1995

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C r I r This nozzle illustrated in Figs 1 to 4 can basically be considered conventional, It can be either machined from a metallic rod or cast and machined and is basically cylindrical having part way along its length lands 11 or the like which provide a hexagonal shape to permit the nozzle to be rotated by a spanner or the like. At one end 12 the nozzle is closed, at the other end 13 open by the formation of a counter-bore St thereinto. The counter-bored end 13 having an external thread SW" 14.

t The closed end has an aperture 15 therethrough forming the actual orifice of the nozzle.

t C The nozzle of the invention differs from conventional nozzles only in that there is a tapered portion 20 at the outer end of the thread, which tapered portion can be formed after the thread has been cut and, possibly, in the same operation as e« the thread cutting operation.

The nozzle has an insert 21., which can be symmetrical and have a central plate passing through the counter-bore axis and a pair of inclined members 22 open at their inner ends which are adapted.,to ensure the fluid passing through the nozzle swirls.

1\S C\SR December, 1995 i Sl\SPEC\SPRA3NOZ.CAP\A~.xKn\28 December, 1995 ii *tar C I' 7 When the nozzle is assembled and the insert 21 is located therein the outer edge of the insert terminate approximately at the inner end of the tapered portion 20. An annular die in a press which is adapted to be moved down over the tapered portio' 20 and to cause an inward deformaLion thereoi so that it acts as a barrier to prevent the insert 21 from leaving the nozzle. At the same time it leaves a clean end which does not adversely affect the movement of fluid around the nozzle.

t It is to be appreciated that the effective size of the in turned portion must be such that when the nozzle reaches its highest operating temperature, the diameter across the inner c portion of the in turned tapered portion 20 is less than the L external diameter of the insert 21, so that, even under these circumstances, the insert cannot leave the nozzle.

The concept of the invention is apparently very simple and S uses well known metal working techniques, but it provides a nozzle which overcomes what has been a well known, and long term problem in various applications, without substantially adding to the cost of the nozzles.

The nozzles of Figs 1 to 3 can then be placed into tapped apertures in the wall of the pipe works and can be satisfactorily used close to high temperature material without D: \WP51\SPEC\SPRAYNOZ.CAP\AT.KM\28 December, 1995

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any back pressure, which may be caused by the fluid boiling in the nozzle, causing movement of the insert 21.

The nozzle of Fig 5 is formed similarly to that of Figs 1 to 3 but, ir this case, instead of a moLion imparting insert, the insert can be a ceramic insert 30 having a central aperture 31. Again, there can be differential expansion but, again, the in turned peripheral edge 32 prevents rearward movement of the insert.

"r at St Z .rt i t t 44 A 4t At C a CC te It c a, C C 44 The embodiment of Fig 6 also has a ceramic insert 40 but in this case the counter-bore is of maximum diameter adjacent the outer end and this provides a shoulder 41 against which the ceramic insert can lie. The tapered outer end 42 is peened over to restrain the insert, in this case from leaving the front of the nozzle.

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t- i A D: \Rp5 \SPEC\sPRAAoz .CAP\AT.KM\28 December, 1995

Claims (9)

1. A metallic spray nozzle having a counter-bore from one side thereof into which a component to control the spray is located characterised in that the end of the counter- bore is peened over or otherwise worked to prevent movement of the component. S

2. A nozzle as claimed in claim 1 wherein the component is an insert which can impart a rotary flow to the fluid as it passes into the nozzle.

3. A nozzle as claimed in claim 1 wherein the component is a ceramic insert which includes the aperture for the nozzle. S

4. A nozzle as claimed in any one of the preceding claims wherein the lip of the counter-bore is formed to permit easy peening thereof.

A nozzle as claimed in claim 4 wherein the lip is tapered shaped towards the end of the lip.

6. A nozzle as claimed in any one of claims 1 to 5 wherein the counter-bore is 51\SPEC\SPR A Y NO.AP\AT.KM\15 September, 1998 /T -I N located on the upstream side of the nozzle and the peening is sufficient to accept differential expansion between the component and the counter-bore to prevent movement of the component if reverse pressure is applied to the nozzle.

7. A spray assembly which includes at least one nozzle as claimed in any one of claims 1 to 6 wherein there is pipe works to which the nozzle is associated, the formation of the nozzle being such that at elevated operating temperatures even if there is back pressure through the i nozzle, displacement of the component is restricted by the peened edge. *t I

8. A metallic spray nozzle substantially as hereinbefore described with reference to the accompanying drawings.

9. A spray assembly substar, ially as hereinbefore described with reference to the accompanying drawings. Dated this 1 4 t h day of September 1998 SPRAY NOZZLE ENGINEERING PTY. LIMITED By Its Patent Attorneys A. TATLOCK ASSOCIATES ,e 51\SPEC\SPRAYNOZ.CAP\AT.EM\15 September, 1998 1 0I r! ~4 i<r i\