Spray tip and method of manufacture

Patent metadata

Field	Value
Publication number	US-9675982-B2
Application number	US-201615362047-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Sep 16, 2013
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A spray tip comprises a tip body, a tip piece, and a pre-orifice piece. The tip body has a fluid channel along a channel axis (A C ). The tip piece is disposed within the fluid channel, and has a stepped, narrowing passage that terminates in an outlet orifice. The pre-orifice piece has an inlet passage, and is disposed within the fluid channel, abutting and immediately upstream of the tip piece. The pre-orifice piece and the tip piece together define a turbulating chamber therebetween.

First claim

The invention claimed is:

1. A spray tip for atomizing a fluid in a spray, the spray tip comprising:
a tip body, the tip body having a cylindrical portion having an exterior circumference, the cylindrical portion having an aperture that extends through the cylindrical portion, the aperture having a pair of openings respectively located on opposite sides of the exterior circumference, wherein the fluid moves through the aperture in an upstream to downstream orientation;
a pre-orifice piece located in the aperture of the tip body, the pre-orifice piece having an inlet passage and a chamber section, the inlet passage located upstream of the chamber section, the inlet passage is narrower than the chamber section; and
a tip piece located in the aperture of the tip body downstream of the pre-orifice piece and abutting the pre-orifice piece, the tip piece having a stepped section and an outlet aperture, the outlet aperture downstream of the stepped section, the outlet aperture is narrower than the stepped section, the stepped section comprising a plurality of cylindrical steps, the plurality of cylindrical steps arranged sequentially converging from widest upstream and narrowing downstream toward the outlet aperture,
wherein the pre-orifice and the tip piece together form a turbulating chamber that is located between the inlet passage and the outlet aperture and the fluid flows through each of the inlet passage, the chamber section, and the stepped section before being released through the outlet aperture as the spray, and
wherein the tip piece and the pre-orifice piece fully define the turbulating chamber, the chamber section of the pre-orifice piece has an upstream frustoconical surface that widens in a downstream direction and that defines an upstream portion of the turbulating chamber, and the tip piece has a downstream frustoconical surface of the turbulating chamber that narrows in the downstream direction and that defines a downstream portion of the turbulating chamber.

2. The spray tip of claim 1 , wherein the plurality of cylindrical steps comprises three coaxial cylindrical passages that sequentially decrease in diameter.

3. The spray tip of claim 2 , wherein the narrowest cylindrical passage terminates at the outlet aperture.

4. The spray tip of claim 1 , wherein the inlet passage is the narrowest passage within the aperture that is upstream of the tip piece.

5. The spray tip of claim 1 , wherein the downstream frustoconical surface of the tip piece is located upstream of the stepped section.

6. The spray tip of claim 1 , wherein the tip piece is formed from tungsten carbide.

7. The spray tip of claim 1 , wherein the cylindrical portion of the tip body is configured to be inserted into a nozzle of a spray device, rotated within the nozzle, and removed from the nozzle.

8. The spray tip of claim 1 , further comprising a bayonet on an exterior surface of the tip body.

9. The spray tip of claim 1 , wherein an interior surface of the cylindrical portion that defines the aperture contacts each of the pre-orifice piece and the tip piece with no intervening elements therebetween.

10. The spray tip of claim 1 , wherein the turbulating chamber has an inner diameter that is greater than inner diameters of the inlet passage and the outlet aperture.

11. The spray tip of claim 1 , wherein the cylindrical portion of the tip body comprises a front block disposed axially downstream of the tip piece, the front block defining a narrowed portion of the aperture which prevents the tip piece from moving downstream along the aperture.

12. The spray tip of claim 1 , wherein the cylindrical portion of the tip body is formed as a unitary portion of a material, and the unitary portion of the material defines the aperture.

13. The spray tip of claim 12 , wherein the material is a polymer that is overmolded on the pre-orifice piece and the tip piece.

14. The spray tip of claim 1 , further comprising a pair of tabs that are attached to the tip body and project from the tip body in opposite directions.

15. The spray tip of claim 1 , wherein the pre-orifice piece extends into the tip piece.

16. A spray tip for atomizing a fluid in a spray, the spray tip comprising:
a tip body, the tip body having a cylindrical portion having an exterior circumference, the cylindrical portion having an aperture that extends through the cylindrical portion, the aperture having a pair of openings respectively located on opposite sides of the exterior circumference, wherein the fluid moves through the aperture in an upstream to downstream orientation;
a pre-orifice piece located in the aperture of the tip body, the pre-orifice piece having an inlet passage and a chamber section, the inlet passage located upstream of the chamber section, the inlet passage is narrower than the chamber section, the chamber section of the pre-orifice piece having an upstream frustoconical surface that widens in the downstream direction; and
a tip piece located in the aperture of the tip body downstream of the pre-orifice piece and abutting the pre-orifice piece, the tip piece having a chamber section, a stepped section, and an outlet aperture, the chamber section of the tip piece upstream of the stepped section, the chamber section of the tip piece having a downstream frustoconical surface that narrows in the downstream direction, the stepped section comprising three cylindrical passages that are situated downstream from the downstream frustoconical surface, and that sequentially decrease in diameter converging from widest in the upstream direction and narrowing in the downstream direction, the outlet aperture downstream of the stepped section, the outlet aperture narrower than the chamber section of the tip piece,
wherein an interior surface of the cylindrical portion that defines the aperture contacts each of the pre-orifice piece and the tip piece, the upstream frustoconical surface of the pre-orifice and the downstream frustoconical surface of the tip piece together form a double-conical turbulating chamber, and the fluid flows through each of the inlet passage, the turbulating chamber, and the stepped section before being released through the outlet aperture as the spray.

17. A spray tip for atomizing fluid in a spray, the spray tip comprising:
a tip body, the tip body having a cylindrical portion that is elongated along a body axis, the tip body having an aperture that extends through the cylindrical portion along a channel axis that is transverse to the body axis, the channel axis oriented along opposite upstream and downstream directions;
a pre-orifice piece located in the aperture of the tip body, the pre-orifice piece having an inlet passage and an upstream chamber section, wherein the inlet passage is coaxial with the channel axis and located upstream of the upstream chamber section, the inlet passage is narrower than the upstream chamber section; and
a tip piece located in the aperture of the tip body downstream of and abutting the pre-orifice piece, the tip piece having a stepped section and an outlet aperture, the outlet aperture located downstream of the stepped section and along the channel axis, the stepped section comprising three cylindrical passages that are disposed coaxially with the channel axis and that sequentially decrease in diameter converging from widest in the upstream direction and narrowing in the downstream direction,
wherein the pre-orifice and the tip piece together form a turbulating chamber that is located between the inlet passage and the outlet aperture, and the fluid flows in order through each of the inlet pa

Assignees

• Graco Minnesota Inc

Inventors

• Becker Steven Dale
• Olson Diane Leigh
• Wojciechowski Craig Joseph
• Thompson David John

Classifications

• B05B9/0838

  supply being effected by follower in container, e.g. membrane or floating piston, or by deformation of container · CPC title

• B05B9/0861

  the motor being electric · CPC title

• B05B1/02 Primary

  designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, {or having an outlet of particular shape}(B05B1/26, B05B1/28, B05B1/34 take precedence) · CPC title

• B05B9/01

  Spray pistols, {discharge devices}(B05B9/03 takes precedence) · CPC title

• B05B15/534

  by reversing the nozzle relative to the supply conduit · CPC title