IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0279523
(2011-10-24)
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등록번호 |
US-9267512
(2016-02-23)
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발명자
/ 주소 |
- Chrabascz, Eric
- Richardson, Victoria S.
- Dorman, David A.
|
출원인 / 주소 |
- Hamilton Sundstrand Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
27 |
초록
▼
A diffuser for a ram air fan assembly includes a perforated cone, an inlet ring seal, and an outlet ring seal. The perforated cone has a frustoconical shape symmetrical about an axis of the diffuser. The inlet ring seal is attached to, and axially disposed about, a first end of the perforated cone.
A diffuser for a ram air fan assembly includes a perforated cone, an inlet ring seal, and an outlet ring seal. The perforated cone has a frustoconical shape symmetrical about an axis of the diffuser. The inlet ring seal is attached to, and axially disposed about, a first end of the perforated cone. The inlet ring seal includes a fan housing connection having a cylindrical shape. The outlet ring seal is attached to, and axially disposed about, a second end of the perforated cone. An average external diameter of the second end is greater than an average external diameter of the first end such that the perforated cone extends away from the inlet ring seal and radially outward from the axis of the diffuser.
대표청구항
▼
1. A ram air fan diffuser for a ram air fan assembly, the diffuser comprising: a perforated cone having a frustoconical shape symmetrical about an axis of the diffuser with a plurality of perforations between a first end and a second end of the perforated cone;an inlet ring seal attached to and axia
1. A ram air fan diffuser for a ram air fan assembly, the diffuser comprising: a perforated cone having a frustoconical shape symmetrical about an axis of the diffuser with a plurality of perforations between a first end and a second end of the perforated cone;an inlet ring seal attached to and axially disposed about the first end of the perforated cone; andan outlet ring seal attached to and axially disposed about the second end of the perforated cone, wherein the outlet ring seal comprises a cylindrical exterior surface symmetrical about the axis of the diffuser, an o-ring channel within the cylindrical exterior surface, and a diffuser rim extending radially beyond the second end of the perforated cone and radially outward in a plane perpendicular from the axis of the diffuser;wherein an average external diameter of the second end of the perforated cone is greater than an average external diameter of the first end of the perforated cone such that the perforated cone extends away from the inlet ring seal and radially outward from the axis of the diffuser. 2. The diffuser of claim 1, wherein the perforated cone extends away from the inlet ring seal and radially outward from the axis of the diffuser at an angle of between 4.95 degrees and 5.11 degrees from the axis of the diffuser. 3. The diffuser of claim 1, wherein the inlet ring seal and the outlet ring seal are made of fiber-reinforced polymer composite and the perforated cone is made of metal. 4. The diffuser of claim 1, wherein a ratio of a length of the perforated cone to the average external diameter of the second end of the perforated cone is about 0.74, wherein the length of the perforated cone is a distance in a direction parallel to the axis of the diffuser. 5. The diffuser of claim 1, wherein a ratio of a length of the perforated cone to the average external diameter of the second end of the perforated cone is no less than 0.740 and no greater than 0.743, wherein the length of the perforated cone is a distance in a direction parallel to the axis of the diffuser. 6. The diffuser of claim 1, wherein a length of the perforated cone is about 11.730 inches (or about 297.94 mm), the average external diameter of the first end of the perforated cone is about 13.750 inches (or about 349.25 mm), and the average external diameter of the second end of the perforated cone is about 15.815 inches (or about 401.70 mm). 7. The diffuser of claim 1, wherein a length of the perforated cone is between 11.720 inches and 11.740 inches (or between 297.69 mm and 298.20 mm), the average external diameter of the first end of the perforated cone is between 13.735 inches and 13.765 inches (or between 348.87 mm and 349.63 mm), and the average external diameter of the second end of the perforated cone is between 15.800 inches and 15.830 inches (or between 401.32 mm and 402.08 mm). 8. The diffuser of claim 1, wherein the inlet ring seal comprises a fan housing connection having a cylindrical shape; and an internal diameter of the fan housing connection is about 13.950 inches (or about 354.33 mm). 9. The diffuser of claim 1, wherein the inlet ring seal comprises a fan housing connection having a cylindrical shape; and an internal diameter of the fan housing connection is between 13.935 inches and 13.965 inches (or between 353.95 mm and 354.71 mm). 10. The diffuser of claim 1, wherein an average external diameter of the cylindrical exterior surface is about 16.665 inches (or about 423.29 mm); an average external diameter of the o-ring channel is about 16.456 inches (or about 417.98 mm); and an average diameter of the diffuser rim at an outermost radial limit of a radial extension of the diffuser rim is about 16.445 inches (or about 417.70 mm). 11. The diffuser of claim 1, wherein an average external diameter of the cylindrical exterior surface is between 16.650 inches and 16.680 inches (or between 422.91 mm and 423.67 mm) with a maximum external diameter of 16.695 inches (or 424.05 mm); an average external diameter of the o-ring channel is between 16.441 inches and 16.471 inches (or between 417.60 mm and 418.36 mm) with a maximum external diameter of 16.486 inches (or 418.74 mm); and an average diameter of the diffuser rim at an outermost radial limit of a radial extension of the diffuser rim is between 16.430 inches and 16.460 inches (or between 417.32 mm and 418.08 mm) with a maximum external diameter of 16.475 inches (or 418.47 mm). 12. A ram air fan assembly comprising: a fan housing;a fan rotor;a bearing housing attached to the fan housing;an outer housing connected to the fan housing;an inner housing attached to the bearing housing; anda diffuser disposed axially within the outer housing and disposed axially about the bearing housing and at least a portion of each of the fan housing and the inner housing for diffusing fan air from the fan rotor, the diffuser comprising: a perforated cone having a frustoconical shape symmetrical about an axis of the diffuser with a plurality of perforations between a first end and a second end of the perforated cone;an inlet ring seal attached to and axially disposed about the first end of the perforated cone; the inlet ring seal comprising a fan housing connection having a cylindrical shape; andan outlet ring seal for connecting the diffuser to the outer housing; the outlet ring seal attached to and axially disposed about the second end of the perforated cone, wherein the outlet ring seal comprises a cylindrical exterior surface symmetrical about the axis of the diffuser, an o-ring channel within the cylindrical exterior surface, and a diffuser rim extending radially beyond the second end of the perforated cone and radially outward in a plane perpendicular from the axis of the diffuser;wherein an average external diameter of the second end of the perforated cone is greater than an average external diameter of the first end of the perforated cone such that the perforated cone extends away from the inlet ring seal and radially outward from the axis of the diffuser. 13. The ram air fan assembly of claim 12, wherein the perforated cone extends away from the inlet ring seal and radially outward from the axis of the diffuser at an angle of between 4.95 degrees and 5.11 degrees from the axis of the diffuser. 14. The ram air fan assembly of claim 12, wherein the perforated cone extends away from the inlet ring seal and radially outward from the axis of the diffuser at an angle of about 5 degrees from the axis of the diffuser. 15. The ram air fan assembly of claim 12, wherein the inlet ring seal and the outlet ring seal are made of fiber-reinforced polymer composite and the perforated cone is made of metal. 16. The ram air fan assembly of claim 12, wherein a ratio of a length of the perforated cone to the average external diameter of the second end of the perforated cone is no less than 0.740 and no greater than 0.743, wherein the length of the perforated cone is a distance in a direction parallel to the axis of the diffuser. 17. The ram air fan assembly of claim 12, wherein a length of the perforated cone is between 11.720 inches and 11.740 inches (or between 297.69 mm and 298.20 mm), the average external diameter of the first end of the perforated cone is between 13.735 inches and 13.765 inches (or between 348.87 mm and 349.63 mm), and the average external diameter of the second end of the perforated cone is between 15.800 inches and 15.830 inches (or between 401.32 mm and 402.08 mm). 18. The ram air fain assembly of claim 12 further comprising: acoustic foam occupying at least most of a volume between the perforated cone and the outer housing. 19. A method for installing a ram air fan diffuser in a ram air fan assembly, the diffuser comprising a perforated cone having a frustoconical shape symmetrical about an axis of the diffuser with a plurality of perforations between a first end and a second end of the perforated cone; an inlet ring seal attached to and axially disposed about the first end of the perforated cone having a fan housing connection; and an outlet ring seal attached to and axially disposed about the second end of the perforated cone, wherein the outlet ring seal comprises a cylindrical exterior surface symmetrical about the axis of the diffuser, an o-ring channel within the cylindrical exterior surface, and a diffuser rim extending radially beyond the second end of the perforated cone and radially outward in a plane perpendicular from the axis of the diffuser; wherein an average external diameter of the second end of the perforated cone is greater than an average external diameter of the first end of the perforated cone such that the perforated cone extends away from the inlet ring seal and radially outward from the axis of the diffuser, the method comprising: orienting the diffuser such that the fan housing connection of the inlet ring seal faces a fan outlet of the ram air fan assembly;inserting the diffuser into the fan outlet such that the diffuser axially surrounds a bearing housing and at least a portion of each of a fan housing and an inner housing;pressing the diffuser toward the fan housing such that the fan housing connection of the inlet ring seal connects to the fan housing and the outlet ring seal connects to an outer housing;inserting a check valve into a bypass inlet of the ram air fan assembly;connecting a wire transfer tube to the inner housing;feeding electrical wires from the inner housing, through the wire transfer tube, to a terminal box;connecting the electrical wires to the terminal box; andconnecting a motor bearing cooling tube to the inner housing.
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