IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0152565
(2002-05-23)
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우선권정보 |
FR-2001-106872 (2001-05-25) |
발명자
/ 주소 |
- Hodinot, Laurent
- Leclerc, Henry
- Maillard, Claude
- Maillard, David
|
출원인 / 주소 |
|
대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
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인용정보 |
피인용 횟수 :
5 인용 특허 :
4 |
초록
▼
In a turbomachine, there is provided a fuel metering unit having a cylindrical outer sleeve containing a distributor cylinder in which a metering piston can be moved linearly under the action of a control element. The cylindrical sleeve has an inlet orifice for admitting fuel under pressure and at l
In a turbomachine, there is provided a fuel metering unit having a cylindrical outer sleeve containing a distributor cylinder in which a metering piston can be moved linearly under the action of a control element. The cylindrical sleeve has an inlet orifice for admitting fuel under pressure and at least one outlet orifice for injecting fuel into a combustion chamber of the turbomachine, and the metering piston has an annular gap forming a distribution chamber for the fuel admitted via the inlet orifice and delivered via at least one outlet orifice. According to the invention, the distributor cylinder has a plurality of radial feed orifices for admitting fuel into the distribution chamber and at least a first metering orifice and at least a second metering orifice that are separated by a seal disposed at the periphery of the distributor cylinder.
대표청구항
▼
1. A fuel metering unit in a turbomachine, the unit comprising an outer cylindrical sleeve having mounted therein a distributor cylinder in which a metering piston can move linearly under the action of a control element, said cylindrical sleeve having an inlet orifice for admitting fuel under pressu
1. A fuel metering unit in a turbomachine, the unit comprising an outer cylindrical sleeve having mounted therein a distributor cylinder in which a metering piston can move linearly under the action of a control element, said cylindrical sleeve having an inlet orifice for admitting fuel under pressure and at least one first outlet orifice and one second outlet orifice for injecting said fuel into a combustion chamber of said turbomachine, and said metering piston including an annular gap forming a distribution chamber for the fuel admitted via said inlet orifice and delivered via said at least one outlet orifice, wherein said distributor cylinder has a plurality of radial feed orifices for admitting fuel into said distribution chamber from said inlet orifice, and both at least one first metering orifice for expelling the fuel to said first outlet orifice, and at least one second metering orifice for expelling the fuel towards said second outlet orifice, said at least one first and at least one second metering orifices being separated by sealing means placed at the periphery of said distributor cylinder and being placed in a common transverse plane so as to ensure fuel flow continuity towards said combustion chamber during displacement of said metering piston. 2. A unit according to claim 1, comprising two first metering orifices placed diametrically opposite each other. 3. A unit according to claim 2, wherein a flow section of each of said first metering orifices varies exponentially. 4. A unit according to claim 1, comprising two second metering orifices disposed diametrically opposite each other. 5. A unit according to claim 4, wherein a flow section of each of said second metering orifices varies exponentially. 6. A unit according to claim 1, wherein said at least one first metering orifice has a width at a downstream end thereof equal to a width of said at least one second metering orifice at an upstream end thereof. 7. A unit according to claim 1, wherein said first and second metering orifices are offset in pairs by 90° 0 . 8. A unit according to claim 1, wherein said sealing means comprise an elastomer gasket mounted in a groove of a separating partition extending from the outer periphery of said distributor cylinder and separating said at least first metering orifice from said at least second metering orifice. 9. A unit according to claim 1, wherein said sealing means comprise an elastomer gasket mounted in a groove of a separation well disposed around each of said metering orifices so as to isolate them from said second metering orifices. 10. A fuel metering unit in a turbomachine, the unit comprising:an outer cylindrical sleeve having an inlet orifice, a first fuel outlet, and a second fuel outlet;a distributor cylinder mounted inside said outer cylindrical sleeve so as to form a distribution chamber, said distributor cylinder further comprising a plurality of radial feed orifices in communication with said distribution chamber, and a first metering orifice and a second metering orifice in communication with said first and second fuel outlets, respectively, said first and second metering orifices being in communication with said distribution chamber;a metering piston configured to translate inside said distributor cylinder and to further define said distribution chamber; andan undulating seal disposed on an external surface of said distribution cylinder and between said first metering orifice and said second metering orifice. 11. A metering unit according to claim 10, wherein said first and second metering orifices are disposed on said distributor cylinder in a common transverse plane. 12. A metering unit according to claim 10, wherein said first and second metering orifices comprise exponentially varying flow cross sections. 13. A metering unit according to claim 10, wherein said undulating seal is configured to provide leak tight partitioning between said first and second metering orifices. 14. A metering uni t according to claim 10, wherein a width of an outlet of said first metering orifice is equal to a width of an inlet of said second metering orifice. 15. A unit according to claim 10, wherein said undulating seal is an elastomer gasket, said gasket being disposed in a groove of a separating partition extending around an outer periphery of said distributor cylinder. 16. A fuel metering unit in a turbomachine, the unit comprising:an outer cylindrical sleeve having an inlet orifice, a first fuel outlet, and a second fuel outlet;a distributor cylinder mounted inside said outer cylindrical sleeve so as to form a distribution chamber, said distributor cylinder further comprising a plurality of radial feed orifices in communication with said distribution chamber, and a first metering orifice and a second metering orifice in communication with said first and second fuel outlets, respectively, said first and second metering orifices being in communication with said distribution chamber; anda metering piston configured to translate inside said distributor cylinder and to further define said distribution chamber,wherein said first and said second metering orifices are positioned with respect to each other in a common plane transverse to said distribution cylinder. 17. A unit according to claim 16, further comprising isolating wells disposed around each one of said first and second metering orifices. 18. A unit according to claim 17, wherein each one of said wells extends from an outside surface of said distribution cylinder to a vicinity of an inside surface of said outer cylindrical sleeve, said unit further comprising a plurality of sealing gaskets, each one of said sealing gasket being mounted on each one of said wells against said internal surface of said outer cylindrical sleeve. 19. A unit according to claim 18, wherein each of said sealing gaskets is an elastomer gasket.
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