Fluid distribution device

• US 5,188,291 A
• Filed: 05/29/1990
• Issued: 02/23/1993
• Est. Priority Date: 05/31/1989
• Status: Expired due to Fees

• Current Assignee: Her Majesty The Queen In Right of New Zealand Acting By and Through The Director of The Wood Technology Division of The Forest Research Institute of The Ministry of Forestry For
• Original Assignee: Her Majesty The Queen In Right of Canada As Represented By The Minister of National Defence
• Inventors: Cross, David J.
• Primary Examiner(s): Kashnikow, Andres
• Assistant Examiner(s): Weldon, Kevin P.
• Application Number:
  US07/529,886
• Time in Patent Office: 1,001 Days
• Field of Search: 239/229, 239/267.1, 239/706-708, 239/694.8, 239/399.3, 239/423, 239/424.5
• US Class Current: 239/3
• CPC Class Codes: B05B 5/04 characterised by having rotary outlet or deflecting elements , i.e. spraying being also effected by centrifugal forces
• CPC Class Codes: B05B 5/0418 designed for spraying particulate material

Abstract

The invention relates to a fluid distribution device in the form of a sprayer. A preferred embodiment of the sprayer uses a rotating fluid conduit which makes use of centrifugal force to break up fluid emerging from the conduit into fine droplets. Air flow though the preferred embodiment may shear the fluid droplets and assist in carrying them to the desired target. An apparatus for placing an electrostatic charge on the droplets may also be used.

Claims

1. A nozzle assembly for a fluid distribution device including a fluid conduit with a first end and a second end, the fluid conduit having a flexible element enabling the first end of the fluid conduit to move with respect to the second end of the fluid conduit, the second end being connectable to a fluid supply, the nozzle assembly being characterized in that there is sufficient space around the first end of the fluid conduit to allow gas flow introduced into the nozzle assembly to emerge coincident with fluid emerging from the first end of the conduit, and the gas flow introduced into the nozzle assembly directly moves the first end of the fluid conduit sufficiently so that said centrifugal force from the movement of the conduit by the gas flow breaks up fluid from the fluid conduit as it emerges through the first end, and the gas flow past the first end of the fluid conduit is sufficient to cause a shearing effect on the fluid emerging from the first end of the conduit, and wherein means for creating an electrostatic charge of the fluid emerging from the first end of the fluid conduit is situated in the vicinity of the first end of the fluid conduit;

the first end of the conduit being moveable fast enough to prevent arcing by the electrostatic means.

2. A nozzle assembly as claimed in claim 1 wherein the flexible element is the fluid conduit.

3. A nozzle assembly as claimed in claim 1 wherein the fluid conduit comprises a rigid tube and a flexible joint, wherein the flexible joint is the flexible element of the conduit.

4. A nozzle assembly as claimed in claim 1 wherein the nozzle assembly includes a housing and a housing outlet wherein the first end of the conduit is positioned in the vicinity of the housing outlet so that fluid emerging from the first end of the fluid conduit also emerges from said housing outlet.

5. A nozzle assembly as claimed in claim 4 including a housing inlet, the arrangement and construction of the housing being such that gas flow can be introduced into said housing inlet and emerge from the housing outlet.

6. A nozzle assembly as claimed in claim 1 wherein means for creating a electrostatic charge on the fluid emerging from the first end of the fluid conduit is situated in the vicinity of the first end of the fluid conduit.

7. A nozzle assembly as claimed in claim 6 wherein the means for creating a electrostatic charge on the fluid is in the form of an electrode ring.

8. A nozzle assembly as claimed in claim 1 wherein the nozzle assembly includes at least one air dispersal means situated in the vicinity of the first end of the fluid conduit.

9. A nozzle assembly as claimed in claim 8 wherein the air dispersal means is a fan.

10. A nozzle assembly as claimed in claim 8 wherein air introduced into the nozzle assembly drives the air dispersal means.

11. A nozzle assembly as claimed in claim 9 wherein the first end of the fluid conduit is attached to the air dispersal means.

12. A method of fluid dispersal using a nozzle assembly comprising the steps of:

providing a fluid conduit in said nozzle assembly having a first end and a second end, wherein said second end is connected to a fluid supply;

moving fluid from said fluid supply through said fluid conduit toward said first end;

introducing gas into the assembly and flowing it out of the assembly around the first end of the conduit to emerge coincident with the fluid emerging from the conduit, the gas flow into the assembly directly moving the first end of the conduit sufficiently to create centrifugal force within said conduit to break up fluid as it emerges from the conduit at first end;

flowing the gas past said conduit first end as the fluid emerges therefrom with sufficient flow cause a shearing effect on the fluid emerging from the first end of the conduit; and

applying an electrostatic charge on the fluid emerging from the first end of the fluid conduit by means situated in the vicinity of the first end of the fluid conduit;

the movement of the first end of the conduit produced by the gas flowing out of the first end of the conduit being fast enough to prevent arcing by the electrostatic means.