This disclosure generally relates to a fluid flow splitter device that provides fuel to two or more outlet ports. More particularly, this disclosure relates to a fluid flow-splitter that provides a desired accuracy of fluid flow division between two or more ports.
A fuel system for providing fuel flow to an engine, combustor or other energy conversion device can require essentially identical fuel flows to different locations. Such a requirement is measured and specified as a maximum difference between flow rates at each of the outlet locations. Dividing fuel flows between different outlets is often provided by a flow splitter device that includes an electrically or hydraulically actuated valve. The valves are provided to accommodate the desired split of flows over a range of fuel flow rates. The desired accuracy requirements are becoming more stringent and therefore it is desirable to design and develop devices and methods that improve the accuracy in dividing fluid flows among several outlets.
A fuel delivery system is disclosed and includes a flow splitter that divides fuel flow into two substantially equal flows. The flow splitter includes a splitter valve that divides fuel flow from an inlet into two separate flows that exit through a first outlet and a second outlet. A calibration member is disposed in the first outlet and provides adjustment of fuel flow such that the difference between fuel flows can be reduced and/or eliminated.
These and other features disclosed herein can be best understood from the following specification and drawings, the following of which is a brief description.
Referring to
A calibration member 42 is disposed in the first outlet 26 and provides adjustment of fuel flow F1 such that the difference between fuel flows F1 and F2 can be reduced and/or eliminated. Fuel from the first outlet 26 is directed to a first manifold 18. Fuel flow from the second outlet 28 is directed to a second manifold 20. The first and second manifolds 18, 20 in turn direct fuel to an energy conversion device 22, such as a combustor for a gas turbine engine or other combustion engine.
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The example outlets 26, 28 are formed as a first portion 44 that is in communication with the cavity 36 for the splitter valve 30. The first portion 44 includes an open end 45 within which the calibration member 42 is installed. The first portion 44 of the first outlet 26 intersects a second portion 46 that communicates fuel flow out of the housing 15 and to the first manifold 18.
The calibration member 42 includes a fixed portion 48 that is threaded into the opening 45 and supports a movable adjusting member 50. The adjusting member 50 extends into first portion 44 at the intersection with the second portion 46 to block a portion of fluid flow F. The end of the adjusting member 50 includes a restriction 52 that extends a distance 54 into the first outlet 26. The distance 54 is variable by rotating the adjusting member 50. The shape of the restriction 52 provides for blocking a sufficient amount of fuel flow to match flows between the outlets 26 and 28. Substantially equal fuel flows are desired to the first and second manifolds 18, 20 to provide the desired proper operation of the energy conversion device 22.
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The adjusting member 50 includes a groove 64 that provides an indication of the length 54 in which the restriction end 52 has been retracted. The groove 64 also provides a visual indication of the narrowed threaded portion relative to the seal 56 within the fixed portion 48. The visual indication alerts that the narrowed portion of the adjusting member 50 is approaching the seal 56 to prevent errant dislodgement. A head portion 62 of the adjusting member 50 includes a shape that corresponds with a tool for rotating the adjusting member 50 from the retracted position shown in
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The flow matching process begins with the initial installation of the calibration member 42 into the opening 45. Fluid flow is driven through the flow splitter 16 and the outgoing flows F1 and F2 are measured relative to each other. The adjusting member 50 is then extended into the first outlet 26 to block a portion of the fluid flow until the flows F1 and F2 are substantially the same, within an acceptable tolerance range. In the illustrated example, the restriction 52 is disposed at the intersection of the first portion 44 with the second portion 46. However, the calibration member 42, and thereby the restriction 52 could be placed at other locations with the first outlet 26 as would be consistent with matching flows from the outlets 26 and 28.
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The calibrated flow splitter 16 receives flow F from the flow controller 14. Flow F is divided by the splitter valve 30 into passages comprising the first and second outlets 26, 28. The fixed plug 66 extends into the first outlet 26 a length that blocks a portion of the fluid flow such that the outgoing flows F1 and F2 are within a desired range. In the example, the flows F1 and F2 are matched; however other relationships and ratios between flows are within the contemplation of this invention.
Accordingly, the example flow splitter 16 is calibrated to provide a fine adjustment in matching fluid flows beyond the capability of the splitter valve 30. Moreover, the example flow splitter 16 provides such matched flows without the need for identically machining each of the outlets 26 and 28.
Although a preferred embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.