Urea injection systems valves

Patent metadata

Field	Value
Publication number	US-9938875-B2
Application number	US-201615213744-A
Country	US
Kind code	B2
Filing date	Jul 19, 2016
Priority date	Aug 22, 2011
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

Apparatuses and methods for urea dosing of an exhaust after treatment system are disclosed. Exemplary apparatuses include a chamber configured to receive pressurized gas at a first inlet, receive urea solution at a second inlet and provide a combined flow of pressurized gas and urea to an outlet, flow passage extending from the first inlet to a seating surface, and a valve member configured to move between an open position in which the valve member is spaced apart from the seating surface and a closed position in which the valve member contacts the seating surface. As the valve member moves from the open position to the closed position, the valve member contacts the seating surface at a first location and wipes an area of the seating surface extending from the first location in a direction toward the flow passage.

First claim

What is claimed is:

1. An method comprising:
providing a urea dosing system including a gas flow path between a valve and a blending chamber, and a source of urea solution in fluid communication with the blending chamber, the valve including a closing member moveable relative to a contact surface;
maintaining the closing member in a first position wherein the closing member is spaced apart from the contact surface;
moving the closing member to a second position wherein the closing member contacts the contact surface; and
moving the closing member to a third position wherein the closing member contacts a greater area of the contact surface than in the second position;
wherein the closing member slides along the contact surface during movement from the second position to the third position, in a direction toward the gas flow path.

2. A method according to claim 1 wherein the closing member deforms during movement from the second position to the third position.

3. A method according to claim 1 wherein the maintaining the closing member in the first position includes providing gas pressure to the valve above a pressure threshold.

4. A method according to claim 3 wherein the moving the closing member to the second position includes providing gas pressure to the valve below the pressure threshold.

5. A method according to claim 1 wherein the closing member wipes urea crystals from the contact surface during movement from the second position to the third position.

6. A method according to claim 1 wherein the closing member comprises a ball shaped portion and the closing surface is funnel shaped.

7. A urea dosing system for exhaust aftertreatment, the system comprising:
a urea solution source;
a source of pressurized gas;
a check valve in fluid communication with the source of pressurized gas, the check valve including a closing member and a contact surface, the closing member being moveable relative to the contact surface to open and close the check valve;
a flow passage extending from the check valve to a blending chamber; and
a metering valve in fluid communication with the blending chamber, the metering valve configured to supply urea solution from the urea solution source to the blending chamber;
wherein the closing member applies a wiping force to the contact surface in a direction toward the flow passage as the check valve closes.

8. A system according to claim 7 wherein the closing member comprises a spheroid portion that applies the wiping force to the contact surface.

9. A system according to claim 8 wherein the contact surface is frustoconical and the spheroid potion deforms as it applies the wiping force to the contact surface.

10. A system according to claim 7 wherein the wiping force is effective to remove urea crystals from the contact surface as the check valve closes.

11. A system according to claim 7 wherein the closing member elastomerically deforms as it applies the wiping force.

12. A system according to claim 7 wherein the wiping force is applied over an area of the contact surface extending from a first location of the contact surface to a second location of the contact surface, the first location being upstream from the second location relative to a flow direction of pressurized gas from the source to the flow passage.

13. A system according to claim 7 wherein the flow passage provides pressurized gas to the bending chamber in a direction substantially perpendicular to the flow of urea solution from the metering valve through the blending chamber.

Assignees

• Cummins Emission Solutions Inc

Inventors

• Myer Andrew
• Ponnathpur Chetan
• Heichelbech John
• Muntean George
• Holl Stephen
• Burke James F
• Anthis John
• Chakrabarti Joydeep
• Simmons Brandon
• Schmidt Niklas
• Birari Yogesh V

Classifications

• F01N2610/146

  Control thereof, e.g. control of injectors or injection valves · CPC title

• Y10T137/87684

  Valve in each inlet · CPC title

• Y10T137/7836

  Flexible diaphragm or bellows reactor · CPC title

• Y10T137/0396

  Involving pressure control · CPC title

• Y10T137/86815

  Multiple inlet with single outlet · CPC title