IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0040745
(2005-01-21)
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등록번호 |
US-7484522
(2009-02-03)
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발명자
/ 주소 |
- Eick,Chris D.
- Futa, Jr.,Paul W.
- Laidlaw,Mitchell J.
- Libera,Anthony C.
- Purcell,Donald M.
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출원인 / 주소 |
- Honeywell International Inc.
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대리인 / 주소 |
Ingrassia Fisher & Lorenz, P.C.
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인용정보 |
피인용 횟수 :
2 인용 특허 :
13 |
초록
▼
The present invention provides a relatively simple way to automatically turn on and off the fuel to a starter/generator cooling system during engine start. The present invention takes advantage of a fuel pressure rise provided by an engine fuel boost pump during the period from engine start to engin
The present invention provides a relatively simple way to automatically turn on and off the fuel to a starter/generator cooling system during engine start. The present invention takes advantage of a fuel pressure rise provided by an engine fuel boost pump during the period from engine start to engine idle conditions. This pressure rise is used to stroke a shutoff valve in a fuel return to tank valve (FRTTV), which shuts off the starter generator cooling fuel flow. This shutoff occurs automatically with no other external input from, for example, an engine controller. A check valve is also included that prevents back flow through the FRTTV in the event of an engine start with no aircraft pumps running.
대표청구항
▼
We claim: 1. A fuel return to tank valve (FRTTV) for use in an electric starter/generator (S/G) cooling fuel flow system having a S/G fuel oil heat exchanger for cooling S/G oil during engine start, the FRTTV comprising: a housing having an inlet, an outlet and a seat positioned between the inlet a
We claim: 1. A fuel return to tank valve (FRTTV) for use in an electric starter/generator (S/G) cooling fuel flow system having a S/G fuel oil heat exchanger for cooling S/G oil during engine start, the FRTTV comprising: a housing having an inlet, an outlet and a seat positioned between the inlet and the outlet, the inlet being in fluid communication with the outlet through the seat; a shutoff valve moveably positioned within the housing configured to move between a fuel flow position away from the seat and a fuel shutoff position against the seat; a fuel signal pressure inlet coupled to the shutoff valve, the fuel signal pressure inlet being configured to sense fuel pressure rise from an engine fuel boost pump to urge the shutoff valve from the fuel flow position to the fuel shutoff position; and a shutoff valve spring coupled to the shutoff valve, the shutoff valve spring being configured to urge the shutoff valve away from the seat. 2. The FRTTV of claim 1, wherein the inlet is configured to receive fluid from the S/G fuel oil heat exchanger. 3. The FRTTV of claim 1, wherein the outlet is configured to exit fuel to a fuel tank. 4. The FRTTV of claim 1, wherein the shutoff valve is configured to move to the fuel shutoff position at approximately 50 psid of sensed fuel pressure rise. 5. The FRTTV of claim 1, wherein the shutoff valve spring provides a 30 pound pre-load on the shutoff valve. 6. A fuel return to tank valve (FRTTV) for use in an electric starter/generator (S/G) cooling fuel flow system having a S/G fuel oil heat exchanger for cooling S/G oil during engine start, the FRTTV comprising: a housing having an inlet, an outlet and a seat positioned between the inlet and the outlet, the inlet being in fluid communication with the outlet through the seat; a shutoff valve moveably positioned within the housing configured to move between a fuel flow position away from the seat and a fuel shutoff position against the seat; a fuel signal pressure inlet coupled to the shutoff valve, the fuel signal pressure inlet being configured to sense fuel pressure rise from an engine fuel boost pump to urge the shutoff valve from the fuel flow position to the fuel shutoff position; and a moveable check valve configured to move between a fuel shutoff position against the seat and a fuel flow position away from the seat. 7. The FRTTV of claim 6, wherein the check valve is positioned on the inlet side of the seat and the shutoff valve is positioned on the outlet side of the seat. 8. The FRTTV of claim 6, wherein the position of the check valve is based on fuel flow pressure in the inlet. 9. The FRTTV of claim 8, wherein the check valve is configured to move to the fuel flow position at approximately 17 psid of fuel flow pressure. 10. The FRTTV of claim 6, further comprising a check valve spring coupled to the check valve, the check valve spring being configured to urge the check valve toward the seat. 11. The FRTTV of claim 10, wherein the check valve spring provides a 7.5 pound preload on the check valve. 12. A fuel return to tank valve (FRTTV) for use in an electric starter/generator (S/G) cooling fuel flow system having a S/G fuel oil heat exchanger for cooling S/G oil during engine start, the FRTTV comprising: a housing having an inlet, an outlet and a seat positioned between the inlet and the outlet, the inlet being in fluid communication with the outlet through the seat; a shutoff valve moveably positioned within the housing configured to move between a fuel flow position away from the seat and a fuel shutoff position against the seat; a fuel signal pressure inlet coupled to the shutoff valve, the fuel signal pressure inlet being configured to sense fuel pressure rise from an engine fuel boost pump to urge the shutoff valve from the fuel flow position to the fuel shutoff position; and a metering orifice positioned between the shutoff valve and the outlet. 13. The FRTTV of claim 12, wherein the metering orifice is sized to flow 3300 PPH fuel at 15 psid. 14. The FRTTV of claim 12, further comprising a chamber bounded by the shutoff valve and metering orifice. 15. The FRTTV of claim 14, further comprising one or more pressure switches fluidly coupled to the chamber, the one or more pressure switches configured to sense fuel flow in the chamber. 16. A fuel return to tank valve (FRTTV) for use in an electric starter/generator (S/G) cooling fuel flow system having a S/G fuel oil heat exchanger for cooling S/G oil during engine start, the FRTTV comprising: a housing having a inlet in fluid communication with the S/G fuel oil heat exchanger, a outlet in fluid communication with a fuel tank, and a seat positioned within the housing between the inlet and outlet, the inlet being in fluid communication with the outlet through the seat; a shutoff valve moveably positioned within the housing configured to move between a fuel flow position away from the seat and a fuel shutoff position against the seat; and a fuel signal pressure inlet coupled to the shutoff valve, the fuel signal pressure inlet being configured to sense fuel pressure rise from an engine fuel boost pump to urge the shutoff valve from the fuel flow position to the fuel shutoff position. 17. The FRTTV of claim 16, wherein the shutoff valve is configured to move to the fuel shutoff position at approximately 50 psid of sensed fuel pressure rise. 18. The FRTTV of claim 16, further comprising a shutoff valve spring coupled to the shutoff valve, the shutoff valve spring being configured to urge the shutoff valve away from the seat. 19. The FRTTV of claim 16, further comprising a check valve moveably positioned within the housing, the check valve being configured to move between a fuel shutoff position against the seat and a fuel flow position away from the seat. 20. The FRTTV of claim 19, wherein the check valve is positioned on the inlet side of the seat and the shutoff valve is positioned on the outlet side of the seat. 21. The FRTTV of claim 19, wherein the position of the check valve is based on aircraft boost pump fuel flow pressure in the inlet. 22. The FRTTV of claim 19, wherein the check valve is configured to move to the fuel flow position at approximately 17 psig of aircraft boost pump fuel flow pressure. 23. The FRTTV of claim 19, further comprising a check valve spring coupled to the check valve, the check valve spring being configured to urge the check valve toward the seat. 24. The FRTTV of claim 23, wherein the check valve spring provides a 7.5 pound preload on the check valve. 25. The FRTTV of claim 16, further comprising a metering orifice positioned between the shutoff valve and the outlet. 26. The FRTTV of claim 25, wherein the metering orifice is sized to flow 3300 PPH fuel at 15 psid. 27. The FRTTV of claim 25, further comprising a chamber bounded by the shutoff valve and metering orifice. 28. The FRTTV of claim 27, further comprising one or more pressure switches fluidly coupled to the chamber, the one or more pressure switches configured to sense fuel flow in the chamber. 29. A method to automatically turn fuel on and off in a starter/generator (S/G) cooling system having a fuel return to tank valve (FRTTV) coupled to an engine fuel boost pump during engine start, the method comprising; receiving aircraft boost pump fuel by the FRTTV; opening the FRRTV based on the aircraft boost pump fuel pressure; sensing fuel pressure rise from the engine fuel boost pump by the FRTTV; and closing the FRRTV based on the sensed fuel pressure rise. 30. The method of claim 29, wherein the FRRTV includes a check valve and a shutoff valve, and opening the FRRTV is done by the check valve and closing the FRRTV is done by the shutoff valve. 31. The method of claim 30, wherein opening the FRRTV includes moving the check valve from a fuel shutoff position to a fuel flow position. 32. The method of claim 30, wherein the check valve is configured to prevent reverse flow in the heat exchanger fuel system. 33. The method of claim 30, wherein closing the FRRTV includes moving the shutoff valve from a fuel flow position to a fuel shutoff position. 34. The method of claim 30, wherein sensing fuel pressure rise from an engine fuel boost pump by the FRTTV includes a signal pressure inlet coupled to the shutoff valve receiving engine fuel boost pump pressure. 35. The method of claim 30, wherein the shutoff valve is fluidly coupled to the engine fuel boost pump. 36. The method of claim 30, wherein the FRRTV further includes a first spring holding the check valve in a normally closed position. 37. The method of claim 30, wherein the FRRTV further includes a second spring holding the shutoff valve in a normally open position. 38. The method of claim 29, wherein opening the FRRTV is at approximately 17 psig of aircraft boost pump fuel pressure. 39. The method of claim 29, wherein closing the FRRTV is at approximately 50 psid of fuel pressure rise.
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