US2904266A

US2904266A - Spraying nozzles

Info

Publication number: US2904266A
Application number: US601747A
Authority: US
Inventors: Bartlett Frederick Albert
Original assignee: Dorman Sprayer Co Ltd
Current assignee: Dorman Sprayer Co Ltd
Priority date: 1955-08-05
Filing date: 1956-08-02
Publication date: 1959-09-15
Anticipated expiration: 1976-09-15
Also published as: FR1163012A; GB798645A; DE1061559B

Description

Sept. 15, 1 TT 2,904,266

' In ventor Free e r/c A 4. 5a rf/ezt Mftomeys Sept. 15, 19 59 F. A. BARTLETT 2,904,266

SPRAYING NOZZLES Filed Aug. 2, 1956 i: 2 Sheets-Sheet 2 [Peder/6% A i z /e it B I fl /wz ?Stares finite 2,904,266 SPRAYING NOZZLES Frederick Albert Bartlett, Baum, Cambridge, England,

assignor to Dorman Sprayer Company Limited, Ditton Walk, Cambridge, England, a Britishcompany.

Application August 2, 1956,,S'erial N 0. 601,747

Claims priority, application Great Britain August'5*, 1 955 '19 Claims. (CL. 239 553) Thisinvention relates. to spraying nozzles,.particularly for agricultural or horticultural spraying, and has for. an

object to provide an improved"- spraying nozzle adapted to produce a broad spray suitable for giving a wide angle;

of cover, so that it can replace a spray boomequipped with a number of ordinary spray nozzles.

In order to produce a flatspray it haspreviously been proposed to provide a nozzle inwhich the spraying ;liq.-,

uid enters a narrow slot at approximately right. angles through a feed bore penetrating through one of the two walls of the slot, the slot thus. forming an arcuate narrow outlet around part of. the periphery of the nozzle. It is more particularly an object of. the present inventionto provide .aniinproved. nozzle of this kind,,by means of which a desirable distribution of a sprayacross. the area to be sprayed can be obtained.

According to the present invention the slot communicates with a through bore extending a cross the nozzlesubstantially in the plane of the slot, said bore having.

a diameter which is greater than the width of theslot immediately adjacent tothe cross bore. Preferably the arrangement is such that the direction .of liquid flow i11 the slot near the ends of the cross. bore will' ha've a com a spraying nozzle, which is provided with an axial feed passage terminating in va blind end, two outlet passages extending substantially radially from the feed passage to the outer periphery ofthe nozzle, and a slot interconnecting the outer ends of the two outlet vpassagesandf penetrating into the feed passage, so as to" constitute an arcuate narrow' outlet around part of the periphery' of the nozzle.

From another aspect the invention provides a spray'-' ing nozzle which is provided with a longitudinal feed passageterminating ina blind-end, a transverseslotforming' the nozzle" outlet and extending across th,e"fe'ed-pas*v sage, and a bore extending transversely to the-feed" passage in the plane of -the' slot, the slotpenetrating into* the saidtransverse bore throughout "thelength thereof at one sideonly ofthe axis of the bore; The'-feedpas"- sage may be arranged to penetrate through one wall of" the slot only, for which purpose it'should preferably'be' drilled with a'flat-ended drill',.or it may penetrate with-its full diameter through both wall-s of the' slot, while it hasbeen foundliable to affect the uniformity of the spray if thebore constituting thetfeed= passage cuts" into the second-wall of the slot without fully entering this walli The-nozzle may be used at a heighto'fbetwe'en' eighteen atent:

23%,25?) Patented Sept. 15-, 1 959 ice inches and about five feet above the ground, with the feed' passage disposed horizontally and the centre of the slot directed downwardly; according to the desired width or angle of cover the two outlet passages may be arranged diametrically opposite to each other, so as to produce a slot extending over of the periphery of the nozzle, or at a smaller or greater angle to each other, sothat in use the two: holes constituting the outer edges of the spraying outlet are arranged either above or below the diarnetrical axis of the tip.

Preferably the outlet passages and slot are cut at right angles to the axis of the tip' and lie in a; common plane.

In order that. the invention may be more fully under stoodg. reference will now be made to the accompanying drawings, in which:

Figs. '1' and: 2 are respectively a cross section and fragmentary axial section of one form of nozzle according to the invention taken respectively along line II of Fig. 2' and line 'I=I-II of Fig. 1,

Fig; 3' is' a fragmentary axial section of a' modified nozzle;

Fig. 4 is a fragmentary axial section of afurther form of nozzle, and

Figs; 5 and: 6' are respectively a cross section and a fragmentaryaxial section of yet a further modified form of nozzle, Fig. 5' being a cross section along line VV of Fig. 6:.

Referring. now first to Figs. 1 and 2, the nozzle 1 is cylindrical: and has an axial bore 2 to which the spraying-i-liquid' is supplied under pressure. at. itsouter'end and is shown as a blind bore, although it obviously may alternatively, if desired, be drilled as a through bore andtitsouter end closed by a screw-in plug or the like. The blind end of the bore is designated by 3*. Drilled radially into the nozzle in a common plane near the blind end 3 of the bore are two cylindrical outlet. :passagesd; and a narrow slot '5 of narrow-angle V;- profile is cut into the outer circumference of the nozzle int-such: manner as to penetrate into the radial bores 4 adjacent their outer ends while at the same time penetrating the central feed passage 2. This may be done by passing: a. suitable: millingi cutter? of. narrow-angle V-profile across the nozzle tip 1 along a circular path of suitably largerradius, or the cutter maybe passed across the tip three'ati'mes: in straight paths; for example, referring to Fig: .lgufirst in the slightly inclined path '6 to produce the leftshand inclined portion of the slot, then back in a path 7. .inclined in the opposite direction, to produce the right-hand path of the slot, and finally horizontally as shown? at. 8 at such a height that it will slightly penetrate into thetcentral passage 2 when producing the central portion. ofthe slot.

.It has been found that with a nozzle according to thewinvention arranged at a height of eighteen inches to five: feet. above the ground, having the passage 2 horizoirtal' and the slot 5 directed vertically downwardly, a broad spray'is obtained in which the distribution of the spray is ofsatisfactory uniformityover' the width of the sprayed; swath and that the drop sizes of the spray di-- rected'. to the outer ends of the swath was larger than that directed to points near the centre, so as to reduce dllftaof'gthe spray in windy weather.

Various details ofthe nozzle may be varied without exceeding the scope of the invention. Thus, while the two outlet passages 4 have been shown as drilled diametricallyopposite to each-other they may alternatively be drilled toenclose anangle smaller or greater than 180.

In apracticalembodiment of the nozzle as described, which was found to supply a very satisfactory broad spray- .when ,used at a liquid pressure between 30 and 40" po11nds per square inch, vand to deliver liquidpnder these conditions at a rate of about 1 /2 gallons per acre This bore is closed' 3 at a speed of about mph, the outside diameter of the nozzle was inch, the diameter of the feed bore 2 was inch that of the cross bore 4 was .027 inch while the width of the slot 5 at its narrowest part was 0.01 inch and its flare angle Was 5".

In the modified nozzle according to Fig. 3 the feed passage 12 in the body is drilled with a flat-ended drill, so as not to foul the outer side of the slot 15. This slot has parallel walls and is cut in a straight line across the nozzle to a depth beyond the central feed passage 12, where it penetrates one side of a transverse bore 14 throughout the length thereof. The diameter of the bore 14 is somewhat greater than the width of the slot 15, and while the slot penetrates into the bore throughout the length thereof at one side of the axis of the bore, it does not enter into the wall of the bore 14 at the opposite side of this axis. The feed passage 12 has a wider portion 12a at its end where it is connected to the supply line for the spraying liquid. A nozzle of this form was made with the diameter of the feed passage 12 equal to A inch, the diameter of then transverse bore equal to 0.03 inch, and the width of the slot equal to 0.02 inch,

and when used with a knapsack type sprayer at an.

operating speed of two miles per hour and at an operating pressure of 30 pounds per square inch it was found to apply approximately 1 /2 gallons per acre over a width of approximately 21 feet.

In a further form of the invention shown in Fig. 4, the spray nozzle comprises a body 20 provided with a central feed passage 22 communicating with the slot 25 and the transverse bore 24. The slot has parallel walls, and the central feed passage is drilled with a flat ended drill whereby it can be arranged only to penetrate one side of the slot and the transverse bore. In order that the nozzle may handle a larger capacity of spraying liquid a separate feed passage 29 is provided for feeding.

the transverse bore 24. The

feed passages

22 and 29 both communicate with the chamber 21.

In one nozzle constructed as above described the slot 25 has a width of inch, the main feed passage 22 has a diameter of inch, and the separate feed passage 29 has a diameter of inch, as does also the transverse bore 24. When used at a pressure of 40 pounds per square inch, this nozzle is capable of delivering spraying liquid at a rate of ten gallons per acre giving a spray width of 30 feet and at an operating speed of five miles per hour.

In yet a further embodiment of spray nozzle according to the invention, shown in Figs. 5 and 6, there is provided a nozzle body 30 having a central feed passage 32 feeding a parallel-sided slot 35 and a separate feed passage 39 feeding a transverse bore 34. The

feed passages

32 and 39 both communicate with the chamber 31. This nozzle also incorporates a further feature in the form of a short bridge 33 arranged across the centre of the transverse hole. The purpose of the bridge 33 is to prevent interference with the flow of liquid in the transverse bore 34 by the liquid emerging from the slot 35, within the confines of the nozzle and enables the spray width of the nozzle to be increased from approximately 30 feet without the bridge to approximately 45 feet with the bridge when fed with spraying liquid at a pressure of 40 pounds per square inch. The central feed passage 32 in this form of the invention may have a diameter of inch, the separate feed passage 39 may have a diameter of A3 inch, which is also the diameter of the transverse bore 35, and the slot 34 may have a width of & inch.

The nozzles according to this invention have been found not only to ensure satisfactory uniform spray intensity over the whole spray width but it has been found that in addition the droplets reaching the outermost parts of the spray width are larger in an average than the droplets sprayed to the central parts of the spray width, a feature which is of advantage under windy conditions,

because the larger droplets are less liable to drift in the Wind.

The desirable distribution of spray achieved by nozzles of the present invention is believed to be due to the combined action of the jet issuing from the transverse bore or bores with the radial flow through the slot impinging on this jet, resulting in a certain breaking up of the jet stream and the formation of droplets of a smaller size than would otherwise be obtained. The nozzles according to the invention may be adapted to different spray widths by varying the proportions of the width of the slot and diameter of the transverse bore and it will be understood that the dimensions given above are only by way of example.

I claim:

1. A spray nozzle comprising a nozzle body having a feed passage terminating in a blind end, said nozzle body having a slot transverse to the feed passage and extending at least part Way across said feed passage, said nozzle body further having a bore also extending transversely to the feed passage situated substantially in the plane of the slot and having a diameter which is greater than the width of the slot immediately adjacent to the transverse bore, said transverse bore being in communication with the slot and the feed passage.

2. A'spray nozzle comprising a nozzle body having an axial feed passage terminating in a blind end, said nozzle body having a transverse bore in the form of two outlet 1 passages extending substantially radially from the feed as to constitute an arcuate narrow outlet around part of the periphery of the nozzle.

3. A spray nozzle comprising a nozzle body having a longitudinal feed passage terminating in a blind end, said nozzle body having a transverse slot forming the nozzle outlet and extending at least part way across the feed passage said nozzle body further having a bore extending transversely to the feed passage substantially in the plane of the slot, and communicating with the slot throughout at least part of the length of the slot.

4. A spray nozzle as claimed in claim 3, in which the transverse bore is arranged at the inner end of the slot.

5. A spray nozzle as claimed in claim 3, in which the surfaces of the nozzle body defining the walls of the slot are parallel.

6. A spray nozzle as claimed in claim 3, in which the transverse bore is formed as an angular passage.

7. A spray nozzle as claimed in claim 3, in which the nozzle body also has a separate feed passage to the transverse bore.

8. A spray nozzle as claimed in claim 3, in which a bridge piece is arranged across the centre of the transverse bore to prevent interference with the flow of liquid in the bore by the liquid emerging from the slot.

9. A spray nozzle as claimed in claim 3, in which the transverse bore and the slot are cut at right angles to the axis of the tip of the nozzle and lie in a common plane.

10. A spray nozzle as claimed in claim 3, in which the feed passage comprises a wider portion adjacent the liquid inlet end of the nozzle body and a narrower portion between the wider portion and the slot.

11. A spray nozzle comprising a generally cylindrical nozzle body having a feed passage extending longitudinally of said nozzle body and terminating in a blind end, said nozzle body having a slot forming the nozzle outlet located around part of the periphery of the nozzle body and extending substantially transversely to and at least part way across the feed passage, said nozzle body further having a bore extending transversely to the feed passage substantially in the plane of the slot, said bore being of ing with the slot throughout at least part of the length of the slot.

12. A spray nozzle comprising a nozzle body having a feed passage terminating in a blind end, said nozzle body having a slot forming the nozzle outlet located around part of the nozzle body and extending at least part Way across the feed passage, said nozzle body further having a bore extending transversely to the feed passage substantially in the plane of the slot, said bore being of smaller diameter than the feed passage and communicating with the slot throughout at least part of the length of the slot.

13. A spray nozzle as claimed in claim 12, in which the feed passage comprises a wider portion adjacent the liquid inlet end of the nozzle body and a narrow portion between the wider portion and the slot.

14. A spray nozzle comprising a generally horizontallyarranged cylindrical nozzle body having a horizontal axial feed passage extending longitudinally of said nozzle body and terminating in a blind end, said nozzle body having a vertical slot forming the nozzle outlet located around part of the periphery of the nozzle body and extending transversely to and at least part way across the feed passage, said nozzle body further having a horizontal bore extending transversely to the feed passage substantially in the plane of the slot, said bore being of smaller diameter than the feed passage and communicating with the slot throughout at least part of the length of the slot.

15. A spray nozzle comprising a nozzle body having a feed passage terminating in a blind end, said nozzle body having a parallel sided slot forming the nozzle outlet located around part of the nozzle body and extending transversely to and at least part way across the feed passage, said nozzle body further having a bore extending transversely to the feed passage substantially in the plane of the slot, said bore being of smaller diameter than the feed passage and communicating with the slot substantially throughout the length of the slot.

16. A spray nozzle comprising a generally cylindrical nozzle body having a feed passage extending longitudinally of said nozzle body and terminating in a blind end, said nozzle body having a slot forming the nozzle outlet located around part of the periphery of the nozzle body and extending substantially transversely to and at least part way across the feed passage, said nozzle body further having a bore extending transversely to the feed passage substantially in the plane of the slot, said bore being of smaller diameter than the feed passage and communicating with the slot throughout at least part of the length of the slot and said nozzle body also having a second feed passage connected to said transverse bore.

17. A spray nozzle as claimed in claim 16, in which a bridge piece is arranged at the centre of the transverse bore to prevent interference with the liquid flow in the bore by the liquid emerging from the slot.

18. A spray nozzle comprising a nozzle body having a feed passage terminating in a blind end, said nozzle body having a parallel sided slot forming the nozzle outlet located around part of the nozzle body and extending transversely to and at least part way across the feed passage, said nozzle body further having a bore extending transversely to the feed passage substantially in the plane of the slot, and communicating with the slot throughout at least part of the length of the slot and said nozzle body also having a second feed passage connected to said transverse bore.

19. A spray nozzle comprising a nozzle body having a feed passage terminating in a blind end, said nozzle body having a slot forming the nozzle outlet located around part of the nozzle body and extending substantially transversely to and across the feed passage, said nozzle body further having a bore extending transversely to the feed passage substantially in the plane of the slot, said bore communicating with the slot throughout at least part of the length of the slot, and said nozzle body also having a second feed passage connected to said transverse bore and a bridge piece arranged at the centre of the transverse bore.

References Cited in the file of this patent UNITED STATES PATENTS 614,194 Wilgus NOV. 15, 1898 1,092,674 Tinkhans Apr. 7, 1914 FOREIGN PATENTS 572,854 Great Britain Oct. 26, 1945