High viscosity fluid dispensing system

Patent metadata

Field	Value
Publication number	US-9415404-B2
Application number	US-201313919318-A
Country	US
Kind code	B2
Filing date	Jun 17, 2013
Priority date	Jun 17, 2013
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A method and apparatus for dispensing a fluid. In one illustrative embodiment, an apparatus may comprise a housing comprising a chamber, a dispensing device, and a nozzle system. The housing may be configured to receive the fluid. The housing may be configured to increase a tendency of the fluid to flow within the chamber. The dispensing device may be configured to move the fluid in the chamber towards an exit of the chamber such that the fluid is dispensed through the exit of the chamber. The nozzle system may be configured to control an exit pressure of the fluid that is dispensed through the nozzle system.

First claim

What is claimed is:

1. An apparatus comprising:
a housing comprising:
a chamber configured to receive a fluid in which the housing is configured to increase a tendency of the fluid to flow within the chamber; and
a heating system configured to heat the fluid within the chamber to reduce a viscosity of the fluid in the chamber such that the tendency of the fluid to flow within the chamber is increased;

a dispensing device configured to move the fluid in the chamber towards an exit of the chamber such that the fluid is dispensed through the exit of the chamber; and
a nozzle system configured to control an exit pressure of the fluid that is dispensed through the nozzle system.

2. The apparatus of claim 1 , wherein the nozzle system comprises:
a nozzle; and
a nozzle screen positioned at the exit of the chamber in which at least one of the nozzle and the nozzle screen is configured to control the exit pressure of the fluid being dispensed through the nozzle system.

3. The apparatus of claim 2 , wherein the nozzle screen comprises:
a plurality of holes having a plurality of sizes selected to control the exit pressure of the fluid across the nozzle screen.

4. The apparatus of claim 3 , wherein each of the plurality of holes has a tapered shape configured such that the fluid exits the nozzle screen towards a surface in a desired spray pattern with a desired velocity.

5. The apparatus of claim 4 , wherein the tapered shape of a hole in the plurality of holes is formed by the hole having a first diameter at a first side of the nozzle screen that is larger than a second diameter of the hole at a second side of the nozzle screen and wherein the fluid is configured to pass through the hole from the first side to the second side.

6. The apparatus of claim 3 , wherein holes in the plurality of holes at a center of the nozzle screen have a smaller diameter than other holes near a periphery of the nozzle screen such that the fluid exiting the nozzle screen has a substantially constant flow rate across the nozzle screen.

7. The apparatus of claim 1 , wherein the heating system comprises a plurality of heating coils located between an inner surface of the housing and an outer surface of the housing.

8. The apparatus of claim 1 , wherein the housing further comprises:
an inner surface configured to form the chamber; and
an outer surface.

9. The apparatus of claim 8 , wherein the inner surface is comprised of a friction-reducing material configured to reduce friction generated between the fluid and the inner surface as the fluid moves through the chamber such that tendency of the fluid to flow within the chamber is increased.

10. The apparatus of claim 9 , wherein the friction-reducing material is selected from one of polytetrafluoroethylene, a nanostructured non-stick material, and a nanostructured ceramic material.

11. The apparatus of claim 1 , wherein the dispensing device comprises:
an actuation system configured to move the fluid in the chamber towards the exit of the chamber.

12. The apparatus of claim 11 , wherein the actuation system comprises:
a piston configured to move within the chamber; and
a plurality of stoppers, wherein the plurality of stoppers is configured to limit movement of the piston within the chamber.

13. The apparatus of claim 1 further comprising:
a fluid transfer system configured to transfer the fluid from a fluid source to the chamber.

14. The apparatus of claim 13 , wherein the fluid transfer system comprises:
a number of transfer elements configured to allow the fluid to flow from the fluid source to the chamber;
a viscometer configured to measure a viscosity of the fluid being transferred from the fluid source to the chamber; and
a valve configured to control a flow of the fluid into the chamber.

15. The apparatus of claim 1 further comprising:
a tool system associated with the housing and configured to hold a number of tools for use in performing fluid dispensing operations; and
an air protection device associated with the tool system and configured to shield the number of tools from fluid spatter.

16. The apparatus of claim 1 further comprising:
an attachment feature configured for association with the housing and configured for use in attaching one of a drip tray and a drip bucket to catch any dripping of the fluid as the fluid exits the chamber.

17. The apparatus of claim 1 further comprising:
a controller configured to control a heating system and the dispensing device.

18. The apparatus of claim 1 further comprising:
a fluid source configured to hold the fluid, wherein the fluid is transferred from the fluid source to the chamber.

19. The apparatus of claim 18 , wherein the fluid source comprises:
a heating device configured to heat the fluid, while the fluid is held within the fluid source, to a temperature selected based on a viscosity of the fluid.

20. A fluid dispensing system comprising:
a housing comprising:
an outer surface;
an inner surface configured to form a chamber in which the inner surface is comprised of a friction-reducing material selected from one of polytetrafluoroethylene, a nanostructured non-stick material, and a nanostructured ceramic material in which the friction-reducing material is configured to reduce friction generated between the fluid and the inner surface such that a tendency of the fluid to flow through the chamber is increased; and
a heating system configured to heat the fluid within the chamber to reduce a viscosity of the fluid in the chamber such that the tendency of the fluid to flow through the chamber is increased in which the heating system comprises a plurality of heating coils located between the inner surface of the housing and the outer surface of the housing;

a dispensing device configured to move the fluid in the chamber towards an exit of the chamber such that the fluid is dispensed through the exit of the chamber in which the fluid dispensing system comprises a piston configured to move within the chamber and a plurality of stoppers in which at least one of the plurality of stoppers is configured to limit movement of the piston within the chamber;
a nozzle system comprising:
a nozzle; and
a nozzle screen positioned at the exit of the chamber in which the nozzle screen comprises a plurality of holes having a plurality of sizes selected to control an exit pressure of the fluid across the nozzle screen as the fluid exits the nozzle screen such that the fluid is dispensed towards a surface in a desired spray pattern with a desired velocity and in which each of the plurality of holes has a tapered shape;

a fluid transfer system configured to transfer the fluid from a fluid source to the chamber;
a tool system associated with the housing and configured to hold a number of tools for use in performing fluid dispensing operations;
an air protection device associated with the tool system and configured to shield the number of tools from fluid spatter;
an attachment feature configured for association with the housing and configured for use in attaching one of a drip tray and a drip bucket to the housing to catch any dripping of the fluid as the fluid exits the chamber; and
a controller configured to control the heating system and the dispensing device.

21. A method for dispensing a fluid, the method comprising:
receiving the fluid within a chamber formed by an inner surface of a housing;
increasing a tendency of the fluid to flow through the chamber, wherein increasing the

Assignees

• Boeing Co

Inventors

• Toh Chin H
• Logan Trent Rob

Classifications

• B05B1/28

  with integral means for shielding the discharged liquid or other fluent material, e.g. to limit area of spray; with integral means for catching drips or collecting surplus liquid or other fluent material · CPC title

• B05B9/0811

  comprising air supplying means actuated by the operator to pressurise or compress the container · CPC title

• B05B9/0838

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

• B05B1/14 Primary

  with multiple outlet openings (B05B1/02, B05B1/26 take precedence); with strainers in or outside the outlet opening · CPC title

• B05B9/002

  incorporating means for heating or cooling, e.g. the material to be sprayed · CPC title