Patent EA-001527-B1 (EA)
Title: A heat exchanger
Inventor: OSWALD JAMES IAN
IPC: F28D/
Filed: 1996-12-19
Abstract: 1. A method of manufacturing an annular heat exchanger (10), wherein in two sheets of material form parallel sets of apertures and wind said sheets into a spiral such that said apertures are aligned after which the edges of said sheets and the aligned apertures are sealed forming radial channels for feeding and discharging flowing medium from the axial channel. 2. The method as claimed in claim 1, wherein arranging at least one continuous corrugated sheet of material between said sheets with apertures. 3. The method as claimed in claim 2, wherein one of continuous corrugated sheets of material is arranged between said sheets winding them together with two continuous corrugated sheets of material. 4. The method as claimed in any of claims 1 to 3,  wherein the sealing of the edges is by welding, brazing or crimping. 5. The method as claimed in claim 4, wherein the sealing of at least one edge is by continuously welding in a spiral path. 6. The method as claimed in any of claims 1 to 5 wherein the sealing of the apertures is by welding, brazing or crimping. 7. The annular heat exchanger comprising wound into a spiral two sheets of material in which parallel sets of apertures are formed so that the apertures are aligned forming axiallly extending passages between the said sheets' surfaces due to the sealing the edges of sheets and the apertures and a plurality of said radially extending passages, the ends of one axially extending passage are sealed at the edges of said sheets of material,  the ends of another axially extending passage are open, at least one radially extending passage extending through the first or the second continuous sheet of material to supply a first fluid into one axially extending passage, at least one radially extending passage extending radially through the first or second continuous sheet of material (12,14) to remove a first fluid from the first axially extending passage, characterised in that the at least one radially extending passage arranged to supply first fluid into the first axially extending passage and the at least one radially extending passage arranged to remove first fluid from the first axially extending passage are spaced apart transversely of the first and second continuous sheets of material. 8. The heat exchanger as claimed in claim 7, wherein comprises at least one continuous corrugated sheet of material arranged in a spiral. 9. The heat exchanger as claimed in claim 8 wherein the at least one continuous corrugated sheet of material is positioned between one surfaces of said sheets of material. 10. The heat exchanger as claimed in claim 8 wherein the at least one continuous corrugated sheet of material is positioned between another surfaces of said sheets of material. 11. The heat exchanger as claimed in any of claims 8 to 10, wherein there are a plurality of radially extending passages to supply first fluid to the first passage and there are a plurality of radially extending passages to remove first fluid from the first passage. 12. The heat exchanger as claimed in any of claims 8 to 11, wherein there are a plurality of radial passages extending through the second axially extending passage to supply first fluid between adjacent turns of the spiral and there are a plurality of radial passages (44) extending through the second axially extending passage (46) to remove first fluid between adjacent turns of the spiral. 13. The annular heat exchanger as claimed in claim 8, wherein a first continuous corrugated sheet of material is positioned between one surfaces of both sheets and a second corrugated continuous corrugated sheet of material is positioned between other surfaces of both sheets. 14. The annular heat exchanger as claimed in claim 8, wherein the at least one continuous corrugated sheet of material has edge regions and a central region, the spacing between the corrugations in the central region is less than the spacing between the corrugations in the edge regions. 15. The heat exchanger as claimed in any of claims 7 to 14, wherein there are means to define at least one chamber around the heat exchanger and means to pressurize the interior of the at least one chamber such that the heat exchanger is compressed by the pressure in the at least one chamber to at least reduce tensile loads in the heat exchanger. 16. The heat exchanger as claimed in claim 15, wherein the heat exchanger is arranged in the interior of a pressure vessel, the pressure vessel defines the at least one chamber. 17. The heat exchanger as claimed in claim 15 or 16, wherein the means to pressurize the interior of the at least one chamber comprises a source of pressurised fluid. 18. The heat exchanger as claimed in claim 17, wherein the means to pressurize the interior of the at least one chamber comprises a pressurised fluid supplied from a bottle of compressed gas or a gas turbine engine or a compressor of the gas turbine engine. 19. The heat exchanger as claimed in claim 15 or 16, wherein the means to pressurise the interior of the at least one chamber comprises resilient means within the at least one chamber. 20. The A heat exchanger as claimed in claim 19, wherein the resilient means comprises rubber or a plurality of springs.