IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0355138
(2009-01-16)
|
등록번호 |
US-8474515
(2013-07-02)
|
발명자
/ 주소 |
- Burgers, John G.
- Martin, Michael A.
- Gerges, Ihab Edward
- Evans, Bruce L.
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
18 |
초록
▼
A cylindrical heat exchanger for use as a gas cooler in a thermal regenerative machine such as a Stirling engine includes an imperforate middle wall of sufficient strength and thickness to withstand the pressure exerted by the working fluid. The heat exchanger includes an inner corrugated wall locat
A cylindrical heat exchanger for use as a gas cooler in a thermal regenerative machine such as a Stirling engine includes an imperforate middle wall of sufficient strength and thickness to withstand the pressure exerted by the working fluid. The heat exchanger includes an inner corrugated wall located within an axial gas flow passage inside the middle wall, and an outer corrugated wall which defines an axial coolant flow passage along the outer surface of the middle wall. The coolant flow passage preferably contains a corrugated intermediate wall.
대표청구항
▼
1. A heat exchanger, comprising: (a) a cylindrical middle wall open at both ends extending along an axis between a first end and a second end, the middle wall having an outer surface and being free of perforations, the middle wall having a predetermined thickness;(b) an inner wall located inwardly o
1. A heat exchanger, comprising: (a) a cylindrical middle wall open at both ends extending along an axis between a first end and a second end, the middle wall having an outer surface and being free of perforations, the middle wall having a predetermined thickness;(b) an inner wall located inwardly of the middle wall and being attached to the inner surface of the middle wall thereby providing one or more axially-extending spaces therebetween, wherein the inner wall is curved so as to follow the curvature of the middle wall, the inner wall defining an open interior space having opposed open ends, the open interior space adapted for receiving additional components of a heat exchanger system;(c) a first fluid flow passage for the flow of a first fluid through the heat exchanger, the first fluid flow passage comprising the one or more axially-extending spaces formed between the inner wall and the middle wall, wherein the first fluid flow passage is open at its axially-spaced ends, the open axially-spaced ends of the first fluid flow passage being free of corresponding inlet and outlet manifolds thereby allowing the first fluid to flow axially through the first fluid flow passage;(d) an outer wall located outwardly of the middle wall and being curved so as to follow the curvature of the middle wall, wherein one or more axially-extending spaces are provided between the middle wall and the outer wall, the outer wall sealing against the outer surface of the middle wall proximate to a first and a second end of the outer wall;(e) a second fluid flow passage comprising the one or more axially-extending spaces formed between the middle wall and the outer wall, wherein the second fluid flow passage is open at its axially spaced ends, and said second fluid flow passage having a first annular open space at one of the axially spaced ends of the second fluid flow passage and a second annular open space at the other one of said axially spaced ends of the second fluid flow passage;(f) a first manifold in flow communication with the first annular open end of the second fluid flow passage, the first manifold extending circumferentially around the outer surface of the first end of the middle wall, wherein the first manifold is provided with a first fluid opening;(g) a second manifold in flow communication with the second annular open end of the second fluid flow passage, the second manifold extending circumferentially around the outer surface of the second end of the middle wall, wherein the second manifold is provided with a second fluid opening;wherein the predetermined thickness of the middle wall is substantially greater than the thickness of the inner wall and of the outer wall, respectively, and wherein one of the first and second fluid openings serves as an inlet opening; andwherein a circumferentially-extending flow restricting rib is formed on and projects radially outwardly from the outer surface of the middle wall, the circumferentially-extending rib having a length that extends around the circumference of the outer surface of the middle wall, the length of the circumferentially-extending rib being greater than the width of the circumferentially-extending rib, wherein the width is the dimension in the radial direction of the heat exchanger, the circumferentially-extending rib being located proximate to and partially obstructing the annular open end of the second fluid flow passage that is closest to the inlet opening to fluid flowing in the axial direction, wherein the outward radial projection of the circumferentially-extending flow restricting rib varies along the circumference of the outer surface of the middle wall. 2. The heat exchanger according to claim 1, wherein the inner wall is generally cylindrical and is secured to the inner surface of the middle wall at a plurality of points along its circumference. 3. The heat exchanger according to claim 2, wherein the inner wall is comprised of a corrugated fin having a plurality of first axially-extending ridges, a plurality of second axially-extending ridges and a plurality of side walls interconnecting the first and second ridges, wherein the first set of ridges are located outwardly of the second ridges and are secured to the inner surface of the middle wall, such that a plurality of said axially-extending spaces are provided between the inner wall and the middle wall, wherein each of the axially-extending spaces is defined by the inner surface of the middle wall, a pair of adjacent side walls and one of the second ridges. 4. The heat exchanger according to claim 3, wherein each of the first and second ridges extends continuously between the ends of the first fluid flow passage. 5. The heat exchanger according to claim 3, wherein the inner wall is in the form of an offset strip fin in which the first and second ridges are interrupted along their length such that said axially-extending spaces are tortuous. 6. The heat exchanger according to claim 3, further comprising a second inner wall which is located inwardly of the inner wall and is secured to the second ridges of the inner wall, such that the first fluid flow passage is defined by an annular space between the middle wall and the second inner wall. 7. The heat exchanger according to claim 6, wherein the second inner wall is a smooth cylindrical wall which is free of perforations. 8. The heat exchanger according to claim 6, wherein the second inner wall has axially-spaced ends located proximate to the open ends of the middle wall, and wherein at least one of the axially-spaced ends of the second inner wall is provided with an inwardly-projecting portion which is adapted to contact a cylindrical component located inwardly of the second inner wall. 9. The heat exchanger according to claim 8, wherein both of the ends of the second inner wall are provided with one of said inwardly-projecting portions, and wherein one of said inwardly-projecting portions is provided with one or more openings. 10. The heat exchanger according to claim 1, wherein the inner surface of the middle wall is smooth. 11. The heat exchanger according to claim 1, wherein the middle wall is constructed so as to contain an inner gas pressure of at least about 40 bar. 12. The heat exchanger according to claim 1, wherein the outer wall is generally cylindrical such that the open ends of the second fluid flow passage and the manifolds are annular. 13. The heat exchanger according to claim 12, wherein the first and second fluid openings are circumferentially spaced from one another by about 180 degrees. 14. The heat exchanger according to claim 12, wherein the first and second fluid openings are axially aligned with one another. 15. The heat exchanger according to claim 12, wherein the outer wall is smooth and wherein the first and second fluid openings are formed at axially opposite ends of the outer wall. 16. The heat exchanger according to claim 1, wherein the outer surface of the middle wall is provided with radial ridges proximate to its ends, and wherein the outer wall is sealingly secured to the radial ridges. 17. The heat exchanger according to claim 1, wherein a corrugated fin is provided in said second fluid flow passage, wherein the corrugated fin has a plurality of first axially-extending ridges, a plurality of second axially-extending ridges and a plurality of side walls interconnecting the first and second ridges, wherein the first set of ridges are in contact with the outer surface of the middle wall and the second set of ridges is in contact with the outer wall. 18. The heat exchanger according to claim 17, wherein the corrugated fin extends around substantially the entire circumference of the middle wall. 19. The heat exchanger according to claim 17, wherein each of the manifolds is defined within an area enclosed by an outwardly projecting portion of the outer wall, and wherein the corrugated fin has axially-spaced ends which extend into the areas enclosed by the outwardly projecting portions. 20. The heat exchanger according to claim 19, wherein a smooth, cylindrical member is provided over substantially an entire area of the corrugated fin, having ends located proximate to the axially-spaced ends of the corrugated fin. 21. The heat exchanger according to claim 20, wherein said smooth, cylindrical member is at least partially defined by a cylindrical portion of the outer wall which is attached to the outwardly projecting portions of the outer wall. 22. A heat exchanger according to claim 19, wherein the outer wall is formed from two or more arc-shaped segments, wherein a plurality of circumferentially-spaced, axially-extending joints are provided between said segments. 23. A heat exchanger according to claim 22, wherein the outer wall is formed from two semi-circular segments, wherein a pair of axially-extending joints are provided between said segments. 24. A heat exchanger according to claim 23, wherein the outer wall further comprises cover plates to cover the joints between said segments, wherein each of the cover plates is sealingly secured to said two semi-circular segments. 25. A heat exchanger according to claim 24, wherein each of the cover plates is provided with one of said fluid openings. 26. A heat exchanger according to claim 24, wherein one of the cover plates is provided with both of said fluid openings, and wherein the other of the cover plates is free of perforations. 27. The heat exchanger as claimed in claim 1, wherein the circumferentially-extending flow restricting rib is discontinuous around the circumference of the middle wall.
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