Low drift, high efficiency spraying system

Patent metadata

Field	Value
Publication number	US-11484894-B2
Application number	US-202016928135-A
Country	US
Kind code	B2
Filing date	Jul 14, 2020
Priority date	Jul 15, 2019
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

A spray tip including a spray tip body and flow control element is provided. The flow control element includes a pre-orifice through which fluid can enter a primary fluid passage of the spray tip body. First and second discharge orifices are provided in a dome-shaped end wall of the spray tip body with each of the first and second discharge orifices being arranged on a respective one of opposing first and second sides of an apex of the dome-shaped end wall. Each of the first and second discharge orifices having an elongated slot-like configuration that maintains a substantially constant width as the respective discharge orifice extends from a first end to a second end and each and each extending a substantially equal distance to either side of the apex of the dome-shaped end wall.

First claim

The invention claimed is:

1. A spray tip operable for spraying a dual spray pattern comprising:
a one piece spray tip body having a first portion and an integrally formed second portion, the first portion having a cylindrical configuration, the second portion including a dome-shaped end wall, the first and second portions of the spray tip body defining an internal primary fluid passage having a longitudinal flow axis extending between an inlet end of said spray tip body and a downstream end defined by the dome-shaped end wall;
a flow control element arranged at the inlet end of the primary fluid passage, the flow control element including a pre-orifice on the longitudinal flow axis through which fluid can enter the primary fluid passage of the spray tip body, the pre-orifice being configured to produce a first drop in fluid pressure as fluid enters the primary fluid passage through the pre-orifice during operation of the spray tip and wherein the fluid passes through said primary fluid passage without air introduction, into said primary fluid passage during operation of the spray tip and a second drop in fluid pressure is produced as fluid contacts the dome-shaped end wall and is atomized; and
first and second discharge orifices in the dome-shaped end wall with each of the first and second discharge orifices being arranged on a respective one of opposing first and second sides of an apex of the dome-shaped end wall for discharging liquid from said primary fluid passage into the atmosphere without pressurized air induction, each of the first and second discharge orifices having an elongated slot-like configuration that maintains a substantially constant width as the respective discharge orifice extends from a first end to a second end, each of the first and second discharge orifices extending a substantially equal distance to either side of the apex of the dome-shaped end wall, each of the first and second discharge orifices having a centerline that is at a substantially similar angle with respect to a longitudinal axis of the nozzle body.

2. The spray tip of claim 1 further including a flow control guide arranged on an upstream side of the flow control element near the pre-orifice, the flow control guide including an inner surface that is substantially smooth in a direction of fluid flow and is configured to help produce laminar flow of fluid to the pre-orifice.

3. The spray tip of claim 2 wherein the flow control guide is one of a pair of flow control guides each having a C-shaped configuration that is substantially centered on the pre-orifice with the pair of flow control guides at least partially encircling the pre-orifice.

4. The spray tip of claim 3 wherein each of the pair of flow control guides has a substantially flat gripping surface on an outer surface of the respective flow control guide with the flat gripping surfaces being arranged opposite each other.

5. The spray tip of claim 1 wherein a pair of fluid deflectors are provided on an outer surface of the dome-shaped end wall with one fluid deflector being arranged adjacent a each of the discharge orifices, each fluid deflector presenting a deflector surface that is positioned at, and coplanar with, an outward edge of the respective discharge orifice.

6. The spray tip of claim 1 wherein the flow control element comprises a member that is received in a corresponding opening in an inlet end of the spray tip body.

7. A spray nozzle assembly comprising:
a spray tip operable in spraying a dual spray pattern comprising:
a one piece spray tip body having a first portion and a second portion, the first portion having a cylindrical configuration, the second portion including a dome-shaped end wall, the first and second portions of the spray tip body defining an internal primary fluid passage having a longitudinal flow axis extending between an inlet end of said spray tip body and a downstream end defined by the dome-shaped end wall;
a flow control element arranged at the inlet end of the primary fluid passage, the flow control element including a pre-orifice on the longitudinal flow axis through which fluid can enter the primary fluid passage of the spray tip body, the pre-orifice during operation of the spray nozzle assembly being configured to produce a first drop in fluid pressure as fluid enters the primary fluid passage through the pre-orifice and wherein the fluid passes through said primary fluid passage without air introduction into said primary fluid passage during operation of said spray tip and a second drop in fluid pressure is produced as fluid contacts the dome-shaped end wall and is atomized; and
first and second discharge orifices in the dome-shaped end wall with each of the first and second discharge orifices being arranged on a respective one of opposing first and second sides of an apex of the dome-shaped end wall for discharging liquid from said primary fluid passage into the atmosphere without pressurized air induction, each of the first and second discharge orifices having an elongated slot-like configuration that maintains a substantially constant width as the respective discharge orifice extends from a first end to a second end, each of the first and second discharge orifices extending a substantially equal distance to either side of the apex of the dome-shaped end wall, each of the first and second discharge orifices having a centerline that is at a substantially similar angle with respect to a longitudinal axis of the nozzle body; and
a pulse width modulation assembly including an electrically actuated on/off solenoid valve that can oscillate rapidly between an open position in which fluid is allowed to pass to the pre-orifice of the spray tip and a closed position in which the flow of fluid to the spray tip is blocked.

8. The spray nozzle assembly of claim 7 further including a flow control guide arranged on an upstream side of the flow control element near the pre-orifice, the flow control guide including an inner surface that is substantially smooth in a direction of fluid flow and is configured to help produce laminar flow of fluid to the pre-orifice.

9. The spray nozzle assembly of claim 8 wherein the flow control guide is one of a pair of flow control guides each having a C-shaped configuration that is substantially centered on the pre-orifice with the pair of flow control guides at least partially encircling the pre-orifice.

10. The spray nozzle assembly of claim 9 wherein each of the pair of flow control guides has a substantially flat gripping surface on an outer surface of the respective flow control guide with the flat gripping surfaces being arranged opposite each other.

11. The spray nozzle assembly of claim 7 wherein a secondary chamber defining a secondary fluid passage is arranged in the primary fluid passage, the secondary chamber being arranged such that fluid entering the spray tip body via the pre-orifice is communicated into the secondary fluid passage.

12. The spray nozzle assembly of claim 11 wherein the secondary chamber extends less than the entire length of the first portion of the spray tip body and is open at a downstream end thereof such that fluid exiting the secondary fluid passage is directed into the primary fluid passage.

13. The spray nozzle assembly of claim 12 wherein a recirculation passage is defined between a wall of the secondary chamber and an inner wall of the primary fluid passage, the recirculation passage being in communication at a downstream end with the primary fluid passage, the recirculation passage being in communication with the secondary fluid passage via a plurality of venturi openings in the wall of the secondary chamber near a

Assignees

• Spraying Systems Co

Inventors

• Arenson Marc A
• Cederberg Daniel J

Classifications

• B05B15/658

  the spraying apparatus or its outlet axis being perpendicular to the flow conduit · CPC title

• B05B1/046 Primary

  Outlets formed, e.g. cut, in the circumference of tubular or spherical elements · CPC title

• B05B1/267 Primary

  the liquid or other fluent material being deflected in determined directions · CPC title

• B05B1/044

  Slits, e.g. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains (B05B1/046 takes precedence) · CPC title

• B05B1/3402

  to avoid or reduce turbulence, e.g. with fluid flow straightening means · CPC title