SPRAY NOZZLE

• US 3,658,257 A
• Filed: 09/11/1969
• Issued: 04/25/1972
• Est. Priority Date: 09/11/1969
• Status: Expired due to Term

• Current Assignee: Alvin A. Rood
• Original Assignee: Alvin A. Rood
• Inventors: Rood, Alvin A.
• Primary Examiner(s): Wood, Jr., M. Henson
• Assistant Examiner(s): Grant, Edwin D.
• Application Number:
  US04/856,983
• Time in Patent Office: 957 Days
• Field of Search: 239/590.3,599,601,589,597,598,412,602,284,483,468,592,593,594,596,600,591,547
• US Class Current: 239/589
• CPC Class Codes: B05B 1/042 Outlets having two planes of symmetry perpendicular to each other, one of them defining the plane of the jet B05B1/044, B05B1/046 take precedence
• CPC Class Codes: B05B 13/0627 Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies B05B13/0645 takes precedence

Abstract

Improved airless spray nozzles and methods and means for making them. A spray nozzle tip having a central longitudinal passage terminating in an outlet orifice is provided with a single lateral inlet to the passage. The opposite open end of the passage is closed to form a turbulence chamber by means which may be removable or detachable and may be yielding or resilient. The lateral inlet is related in size to the outlet orifice and is in the form of a slot having transverse faces which lie in planes that intersect in a line which lies in a plane normal to the longitudinal axis of the passage. The nozzle tip may be mounted in a carrier. The nozzle tip is readily cleanable by a cleaning probe inserted through the lateral inlet. The nozzle tip is made from a preformed blank having an internal passage by a grinding wheel of the proper shape and size. The effective areas of the inlet and outlet orifices are determined during their cutting by passing air through the passages and measuring the rate of flow from the lateral inlet and from the outlet orifice.

Claims

1. A spray nozzle tip having an internal passage closed at one end and having a spray orifice leading from the passage at its other end and having a side wall of appreciable thickness, a single side inlet to said passage spaced from said other end cut transversely through said side wall, said inlet having an effective area of opening into said passage equal to the effective area of said spray orifice plus or minus about 25% and having substantially planar transverse faces tending to direct fluid into said passage at right angles thereto.

2. A spray nozzle tip comprising an approach passage leading to a spray orifice in one end and having an axis, a coaxial turbulence chamber at the other end, and a single side inlet port for the nozzle tip adjacent said chamber, said inlet port having planar faces dispoSed transversely of said axis and having an effective area of opening into said passage equal to the effective area of said spray orifice, plus or minus about 25 percent.

3. The spray nozzle of claim 2 wherein said faces lie in planes which meet in a line that lies in a plane substantially normal to said axis.

4. In combination, a spray nozzle tip and a nozzle body, said nozzle tip having an approach passage at one end, a turbulence chamber at the other end, and a single side inlet port between said chamber and said passage, said nozzle body having an axis and an internal passage, and having a socket at the downstream end of said body, said socket being inclined with respect to the axis and embracing said nozzle tip with said inlet port communicating with said internal passage.

5. A spray nozzle tip having an axis, an outlet orifice aligned on said axis at one end, a coaxial turbulence chamber at the other end, and a single side inlet port spaced from said orifice and having an effective area equal to the effective area of said outlet orifice plus or minus about 25 percent and having one face disposed transversely of said axis adjacent said turbulence chamber.

6. A spray nozzle tip having an axis, an outlet orifice aligned on said axis at one end, a coaxial turbulence chamber at the other end, a single side inlet port spaced from said orifice and having one face disposed transversely of said axis adjacent said turbulence chamber, and a coaxial approach passage between said port and said orifice, said passage having a substantially spherical dome through which said orifice is cut, said port being spaced from said dome about four to seven times the diameter of the said dome.

7. The nozzle tip of claim 6 in combination with a nozzle body having an internal passage, an axis, a forwardly disposed socket inclined with respect to said body axis and embracing said tip with said port communicating with the internal passage in said body and with said outlet orifice opening beyond the socket.

8. An airless spray nozzle tip having an annular wall of appreciable thickness, an internal longitudinal passage within said wall leading to an outlet orifice, said tip having a longitudinal axis and a lateral inlet port for said passage spaced from said outlet orifice and comprising an inlet orifice cut through said wall;

said port comprising a slot having flat transverse faces which lie in planes that intersect in a line which lies in a plane substantially normal to said axis and having the bottoms of said slot in opposite parts of said wall, said port directing fluid into said passage transversely of said axis and having an effective area equal to the effective area of said outlet orifice plus or minus about 25 percent;

the part of said passage between said port and said outlet orifice comprising an approach passage for the outlet orifice and the rest of the passage comprising a turbulence chamber.

9. The nozzle tip of claim 8 wherein the bottoms of the slot in the opposite parts of said wall are substantially flat and are symmetrically disposed relative to said line, and intersect the internal surface of said wall sharply at an acute angle.

10. The nozzle tip of claim 8 wherein the inlet port has no smaller minimum dimension than said discharge orifice, whereby said inlet port has no more tendency to clog and become obstructed than said discharge orifice.

11. An airless spray nozzle tip having a gallonage flow of water at 500 p.s.i. as little as about 2 or 3 gallons per hour and having an annular wall of appreciable thickness, an internal longitudinal passage within said wall terminating in one end in a dome having an outlet orifice slashed therein, said tip having a longitudinal axis and a lateral inlet port for said passage spaced from said outlet orifice no more than about four to seven times the diameter of said dome, said lateral inlet port comprising an inlet orifice cut through said wall in the form of a slot having fLat transverse faces which lie in planes that intersect in a line which lies in a plane substantially normal to said axis and having the bottoms of said slot in opposite parts of said wall, said port directing fluid into said passage transversely of said axis, the part of said passage between said port and said outlet orifice comprising an approach passage for the outlet orifice and the rest of the passage comprising a turbulence chamber.

12. An airless spray nozzle tip having an annular wall of appreciable thickness, an internal longitudinal passage within said wall leading to an outlet orifice, said tip having a longitudinal axis and a lateral inlet port for said passage spaced from said outlet orifice and comprising an inlet orifice cut through said wall, said port comprising a slot having flat transverse faces which lie in planes that intersect in a line which lies in a plane substantially normal to said axis and having the bottoms of said slot in opposite parts of said wall, said port directing fluid into said passage transversely of said axis and influencing the stream of fluid entering said passage to be transversely constricted and made smaller than the width of said passage at the port and providing longitudinal avenues for turbulent fluid to flow from the turbulence chamber into the approach passage.

13. The nozzle tip of claim 12 in which said turbulence chamber has about the same volume as said approach passage.

14. In combination, a spray nozzle tip and a nozzle body, said nozzle tip having an internal passage closed at one end and having a spray orifice leading from the passage at its other end and having a single side inlet to said passage spaced from said orifice, said nozzle body having a socket embracing said nozzle tip exteriorly of said one end and closing said end, said nozzle body also having a passage leading to said side inlet.

15. In combination, a spray nozzle tip and a nozzle tip carrier, said tip having an internal passage closed at one end and having a spray orifice leading from the passage at its other end and having a single side inlet to said passage spaced from both said ends, said tip being attached to said carrier adjacent said spray orifice, said carrier being spaced away from said inlet and having substantially no portion disposed radially opposite said inlet.

16. An airless spray nozzle assembly adapted to be removably secured to the forward end of a spray gun, comprising a nozzle tip having a spray orifice at its forward end and having an internal passage open at its rearward end and leading to said spray orifice and having a lateral inlet port in the middle of the side thereof, and a nozzle tip carrier in which a forwardly disposed portion of said tip is secured and said carrier having its rearmost portion substantially flush with said inlet orifice.

17. The spray nozzle assembly of claim 16 wherein the said end of said gun and said carrier are adapted to be aligned and spaced apart to comprise the rearward and forward ends of a chamber for fluid under pressure passing from the gun to the inlet port of said nozzle tip, with means for spacing said carrier from the said end of said gun and enclosing said chamber.

18. The nozzle assembly of claim 17 with attaching means for securing said carrier and said spacing means to said gun in fluid tight engagement therewith.

19. The nozzle assembly of claim 18 wherein the said rearward end of said nozzle tip is disposed in said chamber with means for detachably closing said passage at the rearward open end thereof carried by said spacing means.

20. The nozzle assembly of claim 19 in which said spacing means has a perforate resilient web adjacent the rearward end of said tip comprising said closing means.

21. The nozzle assembly of claim 16 with a closure for the rearward end of the tip detachably carried thereby.

22. The nozzle assembly of claim 21 with a sealing ring adapted to be disposed between said carrier and said gun and forming a chamber enclosing the rearWard end of said tip and said closure and conducting fluid from said gun to said inlet port.

23. An airless spray nozzle adapted to be removably secured to the end of a spray gun, comprising a nozzle tip having a forwardly disposed part with an internal passage and a spray orifice leading herefrom at its forward end and having a rearwardly disposed part with an internal passage and a side inlet port therefor, a nozzle tip carrier in which said forwardly disposed part is secured, and means supporting said rearwardly disposed part for joining and separating said parts.

24. The nozzle tip of claim 1 including two pieces having a common longitudinal passage, a discharge orifice in one piece and a side inlet port in the other piece.

25. A spray nozzle tip having an annular wall of appreciable thickness, an internal passage within said wall closed at one end and having a spray orifice at its other end, a single side inlet to said passage cut through said wall transversely of said passage between said ends and having an effective area equal to the effective area of said spray orifice plus or minus about 25 percent, said inlet having substantially flat bottoms in transversely opposite parts of said wall that intersect the internal surface of said wall at acute angles and tend to construct the entering stream transversely.

26. An airless spray nozzle assembly adapted to be removably secured to the forward end of a spray gun comprising a nozzle tip having a spray orifice at its forward end and having an internal passage open at its rearward end and leading to said spray orifice and having a lateral inlet port between said open end and said spray orifice, a nozzle tip carrier in which a forwardly disposed portion of said tip is secured, means for spacing said carrier and nozzle tip from said end of said gun and defining a chamber for fluid under pressure between said gun and said inlet port, the rearward end of said nozzle tip being disposed in said chamber and spaced from said gun, and a removable closure for closing the rearward end of said passage and disposed to be pressed against said end by the static pressure of fluid in said chamber.

27. The nozzle assembly of claim 26 wherein said closure is yieldably supported in said chamber by said spacing means, and is yieldably engaged by the rearward end of said nozzle tip.

28. An airless spray nozzle tip having a flow rate of water less than 20 gallons per hour at 500 p.s.i. and having an internal passage closed at one end and a spray orifice leading from the passage at its other end and having a side wall of appreciable thickness, a single side inlet to said passage spaced from said other end cut transversely through said side wall, said inlet having substantially planar transverse faces tending to direct fluid into said passage transversely thereof.

29. The nozzle tip of claim 28 having a flow rate of 2 to 3 gallons of water per hour at 500 p.s.i.

30. The combination of claim 4 of a size to coat the interior surfaces of containers of less than 1 inch diameter.

31. The combination of claim 30 having a maximum diameter about one-fourth inch.