Provided is a fuel manifold with more than one fuel circuit for connecting a fuel source or fuel sources to at least one fuel injector, the fuel manifold having an inner tube for conveying fuel through a first fuel passage formed interiorly of the inner tube and an outer tube forming with a slot alo
Provided is a fuel manifold with more than one fuel circuit for connecting a fuel source or fuel sources to at least one fuel injector, the fuel manifold having an inner tube for conveying fuel through a first fuel passage formed interiorly of the inner tube and an outer tube forming with a slot along a length of the inner tube a second fuel passage. If one of the fuel passages is in a low flow or no flow condition, fuel flowing through the other of the fuel passages acts to cool the fuel passage in the low flow or no flow condition to prevent stagnant fuel in the passage from heating up and coking.
대표청구항▼
1. A multiple circuit fuel manifold for connecting a fuel source or fuel sources to at least one fuel injector, the manifold including: a manifold tube assembly and a manifold fitting surrounding the manifold tube assembly, the manifold fitting having an end configured to be coupled to a connector;t
1. A multiple circuit fuel manifold for connecting a fuel source or fuel sources to at least one fuel injector, the manifold including: a manifold tube assembly and a manifold fitting surrounding the manifold tube assembly, the manifold fitting having an end configured to be coupled to a connector;the manifold tube assembly including: an inner tube for conveying fuel through a first fuel passage formed interiorly of the inner tube, the inner tube including:at least one slot along a length of an outside diameter thereof; andan opening in a side wall of the inner tube in an area of the inner tube surrounded by the manifold fitting, the opening provided to convey fuel from the first fuel passage to an inner connector tube disposed in the opening;an outer tube surrounding the inner tube and forming with the at least one slot a second fuel passage, the outer tube including an opening in a side wall of the outer tube in an area of the outer tube surrounded by the manifold fitting, the opening in the side wall of the outer tube allowing fuel to pass from the at least one slot to a gap between the manifold fitting and the inner connector tube. 2. A fuel manifold according to claim 1, wherein the inner tube includes at least two slots, one of the slots forming with the outer tube the second fuel passage and the other slot forming with the outer tube a third fuel passage. 3. A fuel manifold according to claim 2, wherein the fuel in the second fuel passage passes into the gap and flows downstream of the manifold fitting and the fuel in the third fuel passage flows downstream of the manifold fitting. 4. A fuel manifold according to claim 2, further including a manifold inlet including a first inlet fitting in fluidic communication with the first fuel passage, a second inlet fitting in fluidic communication with the second fuel passage and a third inlet fitting in fluidic communication with the third fuel passage, each inlet fitting being configured to be coupled to a fuel line. 5. A fuel manifold according to claim 2, further including a manifold inlet including: a first inlet fitting surrounding a second connector tube, the second connector tube being coupled to a proximal end of the inner tube and including:a first connector flow passage disposed interiorly thereof in fluidic communication with the first fuel passage; anda second connector flow passage formed between an inner wall of the inlet fitting and an outer wall of the second connector tube, the second connector flow passage in fluidic communication with the second fuel passage; anda second inlet fitting in fluidic communication with the third fuel passage;wherein each fitting is configured to be coupled to a fuel line. 6. A fuel manifold according to claim 1, further including a manifold inlet including a first inlet fitting in fluidic communication with the first fuel passage and a second inlet fitting in fluidic communication with the second fuel passage, each inlet fitting being configured to be coupled to a fuel line. 7. A fuel manifold according to claim 1, wherein the at least one slot is a helical slot. 8. A fuel manifold according to claim 7, wherein the inner tube includes at least two helical slots that form with the outer tube the second fuel passage. 9. A fuel manifold according to claim 8, wherein the second fuel passage runs along one of the slots from a proximal end of the manifold tube assembly to a distal end of the manifold tube assembly, along a localized slot connecting an end of the slot to an end of the other slot, and along the other slot from the distal end of the manifold tube assembly to the proximal end of the manifold tube assembly. 10. A fuel manifold according to claim 8, further including at least two additional helical slots in the inner tube that form with the outer tube a third fuel passage. 11. A fuel manifold according to claim 10, wherein the third fuel passage runs along one of the additional slots from the proximal end of the manifold tube assembly to the distal end of the manifold tube assembly, along a localized slot connecting an end of the slot to an end of the other additional slot, and along the other additional slot from the distal end of the manifold tube assembly to the proximal end of the manifold tube assembly. 12. A fuel manifold according to claim 1, further including a manifold inlet including a first inlet fitting in fluidic communication with the first fuel passage and a second inlet fitting in fluidic communication with the second fuel passage, each inlet fitting being configured to be coupled to a fuel line. 13. A fuel manifold according to claim 1, wherein the inner tube includes a cylindrical portion forming the first fuel passage and at least two projections extending radially outward from the cylindrical portion. 14. A fuel manifold according to claim 13, wherein the projections are coupled to an inner diameter of the outer tube and form with the outer tube and an outer wall of the cylindrical portion the at least one slot. 15. A fuel manifold including at least two manifold segments, each segment having a manifold tube assembly and at least one manifold fitting according to claim 1. 16. A fuel manifold according to claim 1 in combination with a tubular assembly, the tubular assembly including an second inner connector tube surrounding the first inner connector tube and a connector at least partially surrounding the second inner connector tube and having a proximal end coupled to the manifold fitting. 17. The combination according to claim 16, further including: a nut having an inner circumferential groove and a threaded portion axially spaced from the groove on an inner circumferential surface of the nut;wherein the threaded portion is configured to be coupled to a threaded portion on an outer circumferential surface of the proximal end of the connector; andwherein a thrust wire is configured to be received in the inner circumferential groove of the threaded portion and an outer circumferential groove of the manifold fitting. 18. The combination according to claim 16, further including: a nut having a threaded portion on an inner circumferential surface and an inner shoulder axially spaced from the threaded portion;wherein the threaded portion is configured to be coupled to a threaded portion on an outer circumferential surface of the manifold fitting; andwherein the inner shoulder abuts a flanged portion of the connector when the nut is coupled to the manifold fitting. 19. A method of delivering fuel from a multiple circuit manifold to a fuel injector, the manifold including a manifold inlet having first and second inlet fittings, a manifold tube assembly, and a manifold fitting surrounding the manifold tube assembly, the manifold tube assembly including an inner tube for conveying fuel through a first fuel passage formed interiorly of the inner tube, the inner tube having at least one slot along a length of an outside diameter thereof and an opening in a side wall of the inner tube in an area of the inner tube surrounded by the manifold fitting, the opening provided to convey fuel from the first fuel passage to an inner connector tube disposed in the opening, and an outer tube surrounding the inner tube and forming with the at least one slot a second fuel passage, the outer tube including an opening in a side wall of the outer tube in an area of the outer tube surrounded by the manifold fitting, the opening in the side wall of the outer tube allowing fuel to pass from the at least one slot to a gap between the manifold fitting and the inner connector tube, the method including: receiving fuel at the first inlet fitting; delivering the fuel through the first fuel passage to the inner connector; receiving fuel at the second inlet fitting; and delivering fuel through the second fuel passage to the gap.
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