Fuel Combustion System, Nozzle for Prechamber Assembly Having Coolant Passage in Communication with Orifice Passage, and Method of Making Same

• US 20160348570A1
• Filed: 05/26/2015
• Published: 12/01/2016
• Est. Priority Date: 05/26/2015
• Status: Abandoned Application

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Willi, Martin
• Application Number:
  US14/721,616
• Publication Number:
  US 20160348570A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F02B 19/108 with fuel injection at least into pre-combustion chamber, i.e. injector mounted directly in the pre-combustion chamber
• CPC Class Codes: F02B 19/12 with positive ignition engines with non-timed positive ignition, and with incandescent chambers F02B9/08
• CPC Class Codes: F02B 19/18 Transfer passages between chamber and cylinder
• CPC Class Codes: F02M 21/0215 Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
• CPC Class Codes: F02M 53/043 with cooling means other than air cooling
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

A nozzle for a prechamber assembly of an engine includes a hollow nozzle body which includes an outer surface, an inner surface, and an orifice surface. The outer surface defines an outer orifice opening and a coolant passage inlet opening. The inner surface defines an interior chamber and an inner orifice opening. The orifice surface defines an orifice passage extending between, and in communication with, the outer orifice opening and the inner orifice opening. The orifice passage is in communication with the interior chamber via the inner orifice opening. The orifice surface defines a coolant passage outlet opening which is in communication with the orifice passage. The nozzle body includes a coolant surface which defines a coolant passage within the nozzle body. The coolant passage extends between the coolant passage inlet opening and the coolant passage outlet opening and is in communication with the orifice passage.

Claims

1. A nozzle for a prechamber assembly of an engine, the nozzle comprising:

a nozzle body, the nozzle body being hollow and including an outer surface, an inner surface, and an orifice surface, the outer surface defining an outer orifice opening and a coolant passage inlet opening, the inner surface defining an interior chamber and an inner orifice opening, and the orifice surface defining an orifice passage extending between, and in communication with, the outer orifice opening and the inner orifice opening, the orifice passage being in communication with the interior chamber via the inner orifice opening, the orifice surface defining a coolant passage outlet opening, the coolant passage outlet opening in communication with the orifice passage;

wherein the nozzle body includes a coolant surface, the coolant surface defining a coolant passage within the nozzle body, the coolant passage extending between, and in communication with, the coolant passage inlet opening and the coolant passage outlet opening, and the coolant passage being in communication with the orifice passage.

2. The nozzle according to claim 1, wherein the nozzle body includes a mounting end and a distal tip, the nozzle body defining a central longitudinal axis extending between the mounting end and the distal tip, the orifice surface being disposed within the distal tip, the coolant passage inlet opening being closer to the mounting end along the central longitudinal axis than the coolant passage outlet opening is.

3. The nozzle according to claim 1, wherein the nozzle body includes a second orifice surface, the outer surface defines a second outer orifice opening and a second coolant passage inlet opening, the inner surface defines a second inner orifice opening, and the second orifice surface defines a second orifice passage extending between, and in communication with, the second outer orifice opening and the second inner orifice opening, the second orifice passage being in communication with the interior chamber via the second inner orifice opening, the second orifice surface defining a second coolant passage outlet opening, the second coolant passage outlet opening in communication with the second orifice passage, and wherein the nozzle body includes a second coolant surface, the second coolant surface defining a second coolant passage within the nozzle body, the second coolant passage extending between, and in communication with, the second coolant passage inlet opening and the second coolant passage outlet opening.

4. The nozzle according to claim 1, wherein the orifice surface extends along an orifice axis between the inner orifice opening and the outer orifice opening, and the coolant passage outlet opening is closer to the inner orifice opening along the orifice axis than to the outer orifice opening.

5. The nozzle according to claim 4, wherein the nozzle body includes a mounting end and a distal tip, the nozzle body defining a central longitudinal axis extending between the mounting end and the distal tip, the orifice surface being disposed within the distal tip, the orifice surface has a proximal top portion and a distal bottom portion, the proximal top portion being closer to the mounting end than is the distal bottom portion, and the distal bottom portion defining the coolant passage outlet opening.

6. The nozzle according to claim 1, wherein the nozzle body includes a reservoir surface, the reservoir surface defining a distribution reservoir disposed between the outer surface and the inner surface, the distribution reservoir being in communication with the coolant passage, the reservoir surface defines a reservoir inlet opening and a reservoir outlet opening, and the coolant surface includes a coolant feed surface and a coolant distribution surface, the coolant feed surface defining a coolant feed conduit extending between, and in communication with, the coolant passage inlet opening and the reservoir inlet opening, and the coolant distribution surface defining a coolant distribution conduit extending between, and in communication with, the reservoir outlet opening and the coolant passage outlet opening.

7. The nozzle according to claim 6, wherein the nozzle body includes a mounting end and a distal tip, the nozzle body defining a central longitudinal axis extending between the mounting end and the distal tip, the distal tip including a spherical cap portion, the reservoir surface disposed in the spherical cap portion.

8. The nozzle according to claim 6, wherein the outer surface defines a second coolant passage inlet opening, the reservoir surface defines a second reservoir inlet opening, and the nozzle body includes a second coolant feed surface, the second coolant feed surface defining a second coolant feed conduit extending between, and in communication with, the second coolant passage inlet opening and the second reservoir inlet opening.

9. The nozzle according to claim 6, wherein the nozzle body includes a second orifice surface, the outer surface defines a second outer orifice opening, the inner surface defines a second inner orifice opening, and the second orifice surface defines a second orifice passage extending between, and in communication with, the second outer orifice opening and the second inner orifice opening, the second orifice passage being in communication with the interior chamber via the second inner orifice opening, the second orifice surface defining a second coolant passage outlet opening, the second coolant passage outlet opening in communication with the second orifice passage, and wherein the nozzle body includes a second coolant distribution surface, and the reservoir surface defines a second reservoir outlet opening, and the second coolant distribution surface defining a second coolant distribution conduit extending between, and in communication with, the second reservoir outlet opening and the second coolant passage outlet opening.

10. The nozzle according to claim 9, wherein the outer surface defines a second coolant passage inlet opening, the reservoir surface defines a second reservoir inlet opening, and the nozzle body includes a second coolant feed surface, the second coolant feed surface defining a second coolant feed conduit extending between, and in communication with, the second coolant passage inlet opening and the second reservoir inlet opening.

11. A fuel combustion system comprising:

a cylinder housing, the cylinder housing defining a main combustion chamber;

a prechamber assembly, the prechamber assembly in communication with the main combustion chamber, the prechamber assembly defining a precombustion chamber, the precombustion chamber in communication with the main combustion chamber, the prechamber assembly including a prechamber housing, an ignition device adapted to selectively ignite a fuel supply disposed in the precombustion chamber, and a nozzle, the ignition device mounted to the prechamber housing, the nozzle adjacent the prechamber housing, the nozzle at least partially defining the precombustion chamber, the nozzle including;

a nozzle body, the nozzle body being hollow and including an outer surface, an inner surface, and an orifice surface, the outer surface defining an outer orifice opening and a coolant passage inlet opening, the inner surface defining an interior chamber and an inner orifice opening, and the orifice surface defining an orifice passage extending between, and in communication with, the outer orifice opening and the inner orifice opening, the orifice passage being in communication with the interior chamber via the inner orifice opening and with the main combustion chamber via the outer orifice opening, the orifice surface defining a coolant passage outlet opening, the coolant passage outlet opening in communication with the orifice passage, and

wherein the nozzle body includes a coolant surface, the coolant surface defining a coolant passage within the nozzle body, the coolant passage extending between, and in communication with, the coolant passage inlet opening and the coolant passage outlet opening, and the coolant passage being in communication with the orifice passage.

12. The fuel combustion system according to claim 11, further comprising:

a source of cooling medium, the source of cooling medium in fluid communication with the coolant passage via the coolant passage inlet opening, the source of cooling medium configured to flow into the coolant passage inlet opening, through the coolant passage, out the coolant passage outlet opening, and into the orifice passage.

13. The fuel combustion system according to claim 12, wherein the source of cooling medium is configured to flow into the orifice passage along a coolant orifice flow path, the coolant orifice flow path interposed between the orifice surface and a flow of a flame front of ignited mixture from within the interior chamber out through the orifice passage.

14. The fuel combustion system according to claim 12, wherein the source of cooling medium is configured such that the source of cooling medium disposed within the coolant passage at the coolant passage outlet opening is at a coolant pressure, and the orifice passage has an orifice pressure, the coolant pressure being greater than the orifice pressure.

15. The fuel combustion system according to claim 14, wherein the nozzle body of the nozzle includes a reservoir surface, the reservoir surface defining a distribution reservoir disposed between the outer surface and the inner surface, the distribution reservoir being in communication with the coolant passage, the reservoir surface defines a reservoir inlet opening and a reservoir outlet opening, and the coolant surface includes a coolant feed surface and a coolant distribution surface, the coolant feed surface defining a coolant feed conduit extending between, and in communication with, the coolant passage inlet opening and the reservoir inlet opening, and the coolant distribution surface defining a coolant distribution conduit extending between, and in communication with, the reservoir outlet opening and the coolant passage outlet opening.

16. A method of making a nozzle for a prechamber assembly of an engine, the method of making comprising:

manufacturing a nozzle body, the nozzle body being hollow and including an outer surface and an inner surface, the inner surface defining an interior chamber;

defining an orifice surface in the nozzle body, the orifice surface defining an orifice passage extending between, and in communication with, an outer orifice opening defined in the outer surface and an inner orifice opening defined in the inner surface, the orifice passage being in communication with the interior chamber via the inner orifice opening;

defining a coolant surface in the nozzle body, the coolant surface defining a coolant passage within the nozzle body, the coolant passage extending between, and in communication with, a coolant passage inlet opening defined in the outer surface and a coolant passage outlet opening defined in the orifice surface, the coolant passage in communication with the orifice passage.

17. The method of making according to claim 16, wherein the orifice surface is defined such that the orifice surface extends along an orifice axis between the inner orifice opening and the outer orifice opening, and the coolant passage outlet opening is defined such that the coolant passage outlet opening is closer to the inner orifice opening along the orifice axis than to the outer orifice opening.

18. The method of making according to claim 16, wherein the nozzle body is made such that the nozzle body includes a reservoir surface, the reservoir surface defining a distribution reservoir disposed between the outer surface and the inner surface, the distribution reservoir being in communication with the coolant passage, the reservoir surface defines a reservoir inlet opening and a reservoir outlet opening, and the coolant surface includes a coolant feed surface and a coolant distribution surface, the coolant feed surface defining a coolant feed conduit extending between, and in communication with, the coolant passage inlet opening and the reservoir inlet opening, and the coolant distribution surface defining a coolant distribution conduit extending between, and in communication with, the reservoir outlet opening and the coolant passage outlet opening.

19. The method of making according to claim 16, wherein the nozzle body is manufactured and the coolant surface is defined via additive manufacturing.

20. The method of making according to claim 19, wherein the orifice surface is defined via additive manufacturing.