Patent US6693878B1 successfully refreshed from Google Patents.
US4815535A
Expired / Lapsed
US
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Heat exchanger
Assignee: MTU Aero Engines AG
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Filing: 1987-10-07
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Granted: 1989-03-28
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Expires: 2007-10-07
Abstract
Abstract A heat exchanger having a matrix of tubes around which hot gases flow, the matrix comprising spaced internested oval profiled tubes connected to a manifold for supply of compressed air to the tubes. The manifold is composed of a plurality of superimposed elements assembled on another in fluid-tight fashion. The profiled tubes have rectangular or square base ends which are fitted into corresponding openings in the superimposed elements.
Inventors
- 👤 Klaus Hagemeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:02
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/06; F28F; F28F9/00; F28F9/02; F28F9/0219; F28F9/0221; Y; Y10; Y10S; Y10S165/00; Y10S165/454; Y10S165/471; Y10S165/472
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
159 words
A heat exchanger comprising an assembly of a plurality of heat exchanger tubes for conveying a first fluid therethrough which can undergo heat exchange with a second fluid flowing around the exterior of the tubes, said tubes including portions of oval cross-section arranged in spaced relation in rows and columns in which the tubes are staggered to internest with one another, distributor means connected to said assembly for supply of said first fluid to said tubes and for receiving said first fluid therefrom after said first fluid has undergone heat exchange with said second fluid, said distributor means comprising inlet and outlet ducts spaced from one another, each duct being constituted as a pipe including a plurality of abutting, longitudinal elements mounted on one another in sealed relation, said elements having abutting surfaces provided with recesses which register with one another and defined openings receiving said tubes, said tubes including base ends of polygonal cross-section engaged in said openings.
Claim 2
Dependent Claim
159 words
A heat exchanger comprising an assembly of a plurality of heat exchanger tubes for conveying a first fluid therethrough which can undergo heat exchange with a second fluid flowing around the exterior of the tubes, said tubes including portions of oval cross-section arranged in spaced relation in rows and columns in which the tubes are staggered to internest with one another, distributor means connected to said assembly for supply of said first fluid to said tubes and for receiving said first fluid therefrom after said first fluid has undergone heat exchange with said second fluid, said distributor means comprising inlet and outlet ducts spaced from one another, each duct being constituted as a pipe including a plurality of abutting, longitudinal elements mounted on one another in sealed relation, said elements having abutting surfaces provided with recesses which register with one another and defined openings receiving said tubes, said tubes including base ends of polygonal cross-section engaged in said openings.
Claim 3
Dependent Claim
21 words
A heat exchanger as claimed in claim 1 wherein the polygonal cross-section of the base ends of the tube is rectangular.
Claim 4
Dependent Claim
43 words
A heat exchanger as claimed in claim 2 wherein the oval portion of each tube has a major axis and a minor axis, said oval portion having ends disposed along said major axis which project beyond the rectangular edges of the base end.
Claim 5
Dependent Claim
57 words
A heat exchanger as claimed in claim 2 wherein the tubes in each row are parallel to one another and from the same angle of inclination with respect to a transverse center plane of said distributor means, each tube having a common longitudinal center plane for the portion of oval cross-section and for said rectangular base end.
Claim 6
Dependent Claim
61 words
A heat exchanger as claimed in claim 2 wherein the tubes in each row are parallel to one another and form the same angle of inclination with respect to a transverse center plane of said distributor means, said base ends of said tubes being twisted concentrical around the center of the portions of oval cross-section by the same angle of twist.
Claim 7
Dependent Claim
37 words
A heat exchanger as claimed in claim 5 wherein the oval portion of each tube has a longitudinal center plane which is disposed along a diagonal of the rectangular cross-section of the base end of the tube.
Claim 8
Dependent Claim
76 words
A heat exchanger as claimed in claim 5 wherein said base ends each has a longitudinal center plane forming an angle with the longitudinal center plane of the oval portion of the tube, said distributor means securing said base ends of said tubes at an angle relative to a transverse center plane of said distributor means which is equal to the angle formed between the longitudinal center planes of the base ends and said oval portions.
Claim 9
Dependent Claim
22 words
A heat exchanger as claimed in claim 1 wherein said elements have further abutting surfaces which are flat and free of recesses.
Claim 10
Dependent Claim
27 words
A heat exchanger as claimed in claim 1 wherein said elements include projecting lips at said abutting surfaces to form outwardly open seams at said abutting surfaces.
Claim 11
Dependent Claim
37 words
A heat exchanger as claimed in claim 1 wherein one of the elements of each abutting pair thereof includes an inner rib for engaging the other element of the pair at the interior of the distributor means.
Claim 12
Dependent Claim
79 words
A heat exchanger as claimed in claim 2 wherein said distributor means comprises a plurality of superimposed units each including a central element having opposite abutment surfaces with recesses therein in which said base ends are received, and cover strips on said abutment surfaces covering said base ends, each said unit being an independent assembly of the central element, the cover strips and the heat exchanger tubes whose base ends are received in the recesses of the central element.
Claim 13
Dependent Claim
43 words
A heat exchanger as claimed in claim 2 wherein said distributor means comprises a plurality of spaced elements having planar surfaces defining spaces therebetween, said base ends of the tubes being disposed in said spaces in end to end abutment with one another.
Claim 14
Dependent Claim
43 words
A heat exchanger as claimed in claim 12 wherein said spaced elements which receive said base ends of the tubes have smooth outer surfaces which are in abutment with adjacent spaced elements receiving the base ends of the adjacent line of abutting tubes.
Claim 15
Dependent Claim
107 words
A heat exchanger as claimed in claim 13 wherein the base ends of the tubes in each line have a common plane passing through the longitudinal centers of the tubes, said common plane being parallel to said smooth outer surfaces and forming an angle relative to a transverse center plane of said distributor means, said base ends of said tubes being twisted through an angle relative to a longitudinal center plane passing through the oval portions of the tubes which is equal to the angle formed by said common plane passing through the base ends of the tubes and the transverse center plane of said distributor means.
Claim 16
Dependent Claim
27 words
A heat exchanger as claimed in claim 14 wherein each pair of spaced elements and the base ends of the tubes therebetween forms an independent assembly unit.
Claim 17
Dependent Claim
29 words
A heat exchanger as claimed in claim 13 wherein said spaced elements are integral with said distributor means and define slots for receiving said base ends of said tubes.
Claim 18
Dependent Claim
56 words
A heat exchanger as claimed in claim 5 wherein a common inclined plane passes through the centers of said heat exchanger tubes in successive rows and columns and the distance between the centers of adjacent tubes is equal to the length of said base end of a tube as measured along the longitudinal center plane thereof.
Claim 19
Dependent Claim
29 words
A heat exchanger as claimed in claim 1 wherein said tubes have spaced rectilinear portions secured to said pipes and a U-shaped bend region joined to said rectilinear portions.
Claim 20
Dependent Claim
56 words
A heat exchanger as claimed in claim 19 wherein said base ends of said tubes are rectangular having longer and shorter sides, the longer side of the ends of the tubes extending lengthwise of the pipes, said portions of the tubes of oval cross-section being arranged with the major axes thereof substantially parallel to said pipes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |