Nozzle cap for a fuel injection nozzle operable in a hydrogen internal combustion engine

Patent metadata

Field	Value
Publication number	US-12146455-B2
Application number	US-202118579724-A
Country	US
Kind code	B2
Filing date	Jul 23, 2021
Priority date	Jul 23, 2021
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

A nozzle cap for a fuel injection nozzle operable in a hydrogen internal combustion engine includes an inlet for receiving a flow of hydrogen controllable by an inlet valve arrangeable in the inlet, at least one outlet for providing an exit flow of hydrogen, and an internal bottom flow-guiding body arranged at a bottom side of the nozzle cap downstream of the inlet in a nozzle cap volume, the internal bottom flow-guiding body protruding towards the inlet and comprises a flow-guiding surface for re-directing a flow of hydrogen from the inlet towards the outlet.

First claim

The invention claimed is:

1. A nozzle cap for a fuel injection nozzle operable in a hydrogen internal combustion engine, the nozzle cap comprising:
an inlet for receiving a flow of hydrogen controllable by an inlet valve arrangeable in the inlet,
at least one outlet for providing an exit flow of hydrogen, and
an internal bottom flow-guiding body arranged at a bottom side of the nozzle cap downstream of the inlet in a nozzle cap volume, the internal bottom flow-guiding body comprising a convex ridge protruding towards the inlet and comprises a flow-guiding surface for re-directing a flow of hydrogen from the inlet towards the outlet, the convex ridge is centralized in the bottom of the nozzle cap and is arranged to reach from side-to-side across the entire nozzle cap volume.

2. The nozzle cap according to claim 1 , wherein the outlet comprises a first exit surface and a second exit surface forming the outlet, wherein the shape of the first exit surface substantially follows the shape of the second exit surface, such that the exit flow of hydrogen from the outlet at the first exit surface is in substantially the same direction as the exit flow of hydrogen at the second exit surface.

3. The nozzle cap according to claim 1 , further comprising at least a first internal side flow-guiding body arranged at a side-wall surface of the nozzle cap and protruding inwards in a nozzle cap volume, for guiding the flow of hydrogen towards the at least one outlet.

4. The nozzle cap according to claim 3 , wherein the outlet comprises a first exit surface and a second exit surface forming the outlet, wherein the shape of the at least one first internal side flow-guiding body substantially follows a shape of the flow-guiding surface of the internal bottom flow-guiding body, such that the exit flow of hydrogen from the outlet at the first exit surface is in substantially the same direction as the exit flow of hydrogen at the second exit surface.

5. The nozzle cap according to claim 1 , wherein the outlet comprises a first exit surface and a second exit surface forming the outlet, wherein the first exit surface and a second exit surface together form a conical outlet.

6. The nozzle cap according to claim 1 , wherein the outlet comprises a first exit surface and a second exit surface, wherein the flow-guiding surface of the internal bottom flow-guiding body is arranged next to the second exit surface, the flow-guiding surface and the second exit surface are configured to co-operatively direct the exit flow of hydrogen at the second exit surface in the same direction as the exit flow of hydrogen at the first exit surface.

7. The nozzle cap according to claim 1 , wherein the internal bottom flow-guiding body is configured to redirect a flow of hydrogen towards to two opposite sides of the nozzle cap.

8. The nozzle cap according to claim 7 , comprising two outlets arranged on opposite sides of the internal bottom flow-guiding body, wherein the internal flow-guiding bodies are configured to redirect a flow of hydrogen from the inlet towards the two outlets.

9. The nozzle cap according to claim 8 , wherein the internal bottom flow-guiding body is shaped to fill-out the volume between two outlets in the nozzle cap volume.

10. The nozzle cap according to claim 1 , wherein the internal bottom flow-guiding body is centralized in the bottom of the nozzle cap.

11. The nozzle cap according to claim 1 , wherein the internal bottom flow-guiding body is arranged off-set from a center of the bottom of the nozzle cap.

12. The nozzle cap according to claim 1 , wherein the internal bottom flow-guiding body is shaped to substantially fill the side of the nozzle cap opposite the outlet.

13. The nozzle cap according to claim 1 , wherein the number of outlets is more than two, wherein the internal bottom flow-guiding body comprising a set of flow-guiding surfaces for re-directing a flow of hydrogen towards each of the outlets.

14. The nozzle cap according to claim 1 , wherein the internal bottom flow-guiding body has a convex outer shape.

15. The nozzle cap according to claim 1 , wherein the internal bottom flow-guiding body has a concave outer shape.

16. The nozzle cap according to claim 1 , wherein the internal bottom flow-guiding body comprises flow-guiding elements protruding from the upper ridge of the internal bottom flow-guiding body for providing further adjustments of the hydrogen-flow in the nozzle cap.

17. A fuel injection nozzle comprising an inlet valve and a nozzle cap according to claim 1 .

18. A hydrogen internal combustion engine comprising a fuel injection nozzle according to claim 17 .

19. A vehicle comprising a fuel injection nozzle according to claim 17 .

Assignees

• Volvo Truck Corp

Inventors

• Eismark Jan
• Hindi Gustavo
• Ehleskog Rickard
• Simonsson Tommy

Classifications

• F02M21/0275

  for in-cylinder direct injection, e.g. injector combined with spark plug · CPC title

• F02M21/0278

  Port fuel injectors for single or multipoint injection into the air intake system · CPC title

• F02M21/026 Primary

  Lift valves, i.e. stem operated valves · CPC title

• F02M21/0281

  Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber · CPC title

• F02M61/1806

  characterised by the arrangement of discharge orifices, e.g. orientation or size · CPC title