[특허]Acoustic muffler for turbine engine

The Boeing Company

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Acoustic muffler for turbine engine

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01N-001/02 F01N-001/00 F01N-001/08
미국특허분류(USC)	181/249; 181/255; 181/269; 181/272
출원번호	US-0776552 (2001-02-02)
발명자 / 주소	Moffat, George H. Stubbs, Gene Woodard Voll, William Albert
출원인 / 주소	The Boeing Company
대리인 / 주소	Alston & Bird LLP
인용정보	피인용 횟수 : 30 인용 특허 : 12

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An acoustic muffler for a turbine engine exhaust comprises an outer shell of tubular configuration, a tubular liner disposed within the shell, and a plurality of dividing walls extending between the liner and the outer shell so as to divide the generally annular space between the liner and shell into a plurality of chambers circumferentially spaced about the muffler. A central longitudinal axis of the liner is radially offset from the central longitudinal axis of the shell such that the chambers have different depths in a radial direction of the muffler, and the liner has at least one opening into each chamber. Thus, the muffler has a plurality of chambers of different sizes providing noise attenuation at a plurality of specific tuned frequencies, and the liner provides broad band attenuation. r arm and cooperating with a second mating pivot surface carried on the lever arm for pivotally mounting the lever arm on the rocker arm. 5. A swing check valve according to claim 4, and including a fourth pivot carried by the lever arm and cooperating with a third mating pivot surface carried on the rocker arm for permitting pivotal movement of the lever arm relative to the spring and the rocker arm. 6. A swing check valve according to claim 1, wherein said first pivot carried by the spring comprises a ball and said mating interior surface of the cover comprises a concave surface against which said ball pivots. 7. A swing check valve according to claim 1 or 2, wherein said second pivot comprises a convex bearing surface carried by the spring and said first mating pivot surface carried on the lever arm comprises at least one roller. 8. A swing check valve according to claim 7, wherein said at least one roller moves in an arc along said convex bearing surface as the clapper pivots. 9. A swing check valve according to claim 7, wherein said at least one roller is mounted and extends between said opposing planar members. 10. A swing check valve according to claim 4, wherein said third pivot comprises a hinge pin and said second mating pivot surface carried on the lever arm comprises a complementary opening defined by the lever arm and adapted for receiving said hinge pin therethrough. 11. A swing check valve according to claim 5, wherein said third mating pivot surface carried on the rocker arm comprises a hinge pin and said fourth pivot carried by the lever arm comprises a pair of concave surfaces against which said hinge pin pivots. 12. A swing check valve according to claim 11, wherein each of said concave surfaces comprises a notch defined by a side edge of a respective one of the planar members. 13. A swing check valve according to claim 1, wherein said spring is removably positioned within said valve housing for being axially compressed and expanded between two angles responsive to movement of the clapper, both of which angles are oblique to the direction of flow of fluid through the valve housing. 14. A swing check valve according to claim 1, wherein the force of said spring acting on the clapper when the clapper is in the closed position produces a torque that is greater than the torque produced by the spring acting on the clapper when the clapper is in the open position. 15. A swing check valve according to claim 1, and including an alignment compensator for preventing out-of-alignment movement of the clapper relative to the valve seat, and comprising an alignment spring mounted on said rocker arm and engaging the clapper at a point wherein the point of attachment of the rocker arm to the clapper is between the alignment spring and the pivot point of the rocker arm. 16. A swing check valve according to claim 15, wherein said alignment spring comprises a coil spring. 17. A swing check valve according to claim 15, wherein said alignment spring comprises a flat spring. 18. A swing check backflow preventer valve, comprising: (a) a valve housing having a port for fluid flow therethrough, said valve housing including a pair of spaced-apart removable covers for accessing an interior of the valve housing; and (b) a pair of valve assemblies disposed within the interior of the valve housing for controlling the fluid flow through the valve housing, one of said valve assemblies including: (i) a valve seat in fluid communication with said port; (ii) a clapper pivotally mounted in the valve housing on a rocker arm and moveable between an open position responsive to fluid flow in a downstream direction and a closed position sealed against said valve seat responsive to fluid flow in an opposite, backflow direction; (iii) a spring captured in the valve housing by one of said removable covers without attachment to either the cover or valve housing, and normally urging the clapper into the sealed position against the valve seat; (i

이 특허에 인용된 특허 (12)

이 특허를 인용한 특허 피인용횟수: 30

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Acoustic muffler for turbine engine

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이 특허에 인용된 특허 (12)

이 특허를 인용한 특허 피인용횟수: 30

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Acoustic muffler for turbine engine

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이 특허에 인용된 특허 (12)

이 특허를 인용한 특허 피인용횟수: 30

IPC 상위 출원인

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IPC 상세정보(version : 201201)

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