BR112020006005B1 - APPARATUS AND METHOD - Google Patents

Abstract

This is the joining of thin heat exchanger tubes to piping platform tanks that is improved by extruding thick tubes that have channels or micro channels. Tube material is removed from the spaced areas of the center portions, which leaves thin finned heat exchanger center portions and thicker platform portions. The tubes are curved, twisted and inclined. The tubes are aligned horizontally, vertically or angularly and the platform portions are welded together. Tube material is removed from the ends of the platform portions to form end faces with projections extending from the end faces and surrounding the channels or micro channels. End plates with openings to receive the projections are attached and sealed to the projections and end faces by soldering or brazing. The faceplates are attached and sealed to the openings in the deck tanks by welding or brazing. Tube ends are flattened. Rings are added. Ends and rings are friction welded, avoiding areas around channel openings, and polished.

Description

[001] This order claims the benefit of the Interim Order Serial Number U.S. 62/563,382 filed on September 26, 2017, which is hereby incorporated by reference in its entirety as if fully set forth herein.

BACKGROUND OF THE INVENTION

[002] There are major problems in heat exchanger and air conditioning systems. Heat transfer tubes with additional fins have many connections. Connecting fins to tubes is a problem. Connecting pipe ends to platform tanks is a more serious issue. When interruptions occur in connections, leaks develop this internal exhaust fluid and kill heat exchangers used in Air Conditioning, Heating, Power and Refrigeration systems, for example. Vibrations and bimetallic cell corrosion cause disruptions in connections.

[003] Ends of heat exchanger tubes are connected to openings in the platform tanks at the ends of the tubes. Connecting the pipes to the platform tanks with friction welding is not a solution because the relatively thin pipe ends become deformed. Friction temperatures need to melt and weld pipe ends and platforms distort and destroy pipe ends and ports/channels.

[004] There is a need for solutions to the problems of heat exchange leakage and problems of joining the tube to the platform in heat exchangers.

SUMMARY OF THE INVENTION

[005] The present invention solves the problems of leak destruction in heat exchangers used in heating, energy, air conditioning and refrigeration systems, for example.

[006] The present invention provides tubes with relatively thin central sections to promote heat exchange and with large and thicker end sections to join the platforms. Large tube ends are machined flat. Material is removed from the flat ends to leave projections that present material around the channels in the tubes.

[007] Openings are made in the platforms to receive the shapes of the material around the channels in the tubes. In one embodiment, the large tube ends fit together in the platform face plates. The pipe ends are joined together and are joined with the deck face plates by friction welding or brazing. The pipe end projections are friction welded or brazed into openings in the deck plate. When the pipe ends are brazed together, the projections of the pipe ends extend into the platform chamber from the platform faceplate side. The brazing extends from the sides of the pipe ends, between the flat surfaces of the pipe ends and the deck face plates, and along projections that extend through the openings in the deck face plates.

[008] When the tube ends and projections are welded to the platform face plates, the tube ends are flush and are welded to the platform plate openings on the platform side of the face plate. The pipe ends and the edges of the large flat pipe ends are friction welded to the deck face plates. The intersecting edges of the platform face plates and the platform body are friction welded together.

[009] Important features of the new intervention are and include: • large ends in heat exchange tubes, • angular or circular patterns at the tube material thickness transition points, when moving from thick to thin portions of the tube, and vice versa, • joining large ends to heat exchanger faceplates and/or, • joining large ends of heat exchanger tubes to each other, • flattening end surfaces of enlarged ends of heat exchanger tubes , • remove material from the flattened ends of the heat exchanger tubes to form projections around the internal channels within the tubes, • insert the projections into openings in heat exchanger deck connector faceplates, • join the projections, and the flat surfaces of the heat exchanger tubes to the heat exchanger deck face plates, • weld edges of projections and edges of large ends by friction to the corresponding edges • when brazing, extend the projections through and beyond the faceplate and braze the surfaces of the projections and the end surfaces of the large flat ends of the tubes to the faceplates of heat exchanger, • join all the enlarged ends together in a fixed pattern, • where the fixed pattern is circular.

[0010] The invention provides tubes having one or more channels and having long thin central heat exchange portions and shorter platform end portions. The terminal platform portions are thicker than the thin central heat exchange portions. Have angular or circular patterns at the tube material thickness transition points. The end faces of the end portions are machined or ablated to provide outer projections that extend around and protect one or more channels. The outer projections extend from the smooth and flat end faces into the thick terminal platform portions.

[0011] The end plates have internal openings to receive the external projections. The end plates have internal faces supported, secured and sealed to the end faces of the platform end portions. The inner openings of the end plates are secured and sealed to the outer projections of the end surfaces of the end portions.

[0012] The end plates and outer projections are of equal length to that of the end faces of the tubes in one embodiment. The end plates are welded to the end faces and to the outer projections on the end faces of the platform end portions.

[0013] In another embodiment, the outer projections extend beyond the face plates and the face plates are brazed to the outer projections. Extending the projections beyond the faceplates prevents migration of brazing material into the tube channels.

[0014] The tubes are extruded, and the opposing surfaces of the middle portions of the tube are machined or ablated to remove sections of the tube material and to leave spaced fins integrally formed in the thinnest middle portion. The fins are oblique to the longitudinal directions of the middle portions of the tubes, and one or more channels are one or more microchannels.

[0015] Several similar extruded tubes have channels within the tubes. Material is removed from the middle portions of the tubes, and spaced fins are left in the thin middle portions. Thick platform end portions are left at the ends of the various tubes that have angular or circular patterns at the tube material thickness transition points. The various tubes are aligned horizontally or vertically or are bent, twisted and angled with the tubes twisted and bent in parallel helical relationship. The end platform portions of the various tubes are aligned and joined together by welding prior to machining or ablating the ends of the various joined platform end portions to create a plurality of end faces and a plurality of exterior projections on the various end faces. The various outer projections extend around and protect the canals. The various outer projections are joined to flat end plates or inner and outer perimeter rings. The end plates have a plurality of internal openings that receive the various exterior projections on the various end faces of the joined platform end portions. The various inner openings of the end plates are welded or otherwise joined to the various outer projections. The end plates are welded or otherwise bonded to the various end faces.

[0016] The new method includes extruding thick tubes with channels in the tubes, and then machining or ablating central portions of the tubes, removing material in spaced sections from the central portions, thinning the central portions, forming fins through the tubes and running thicker platform end portions at the tube ends, having angular or circular patterns at tube material thickness transition points, arranging the tubes parallel to each other, and welding or otherwise joining the tubes end portions of adjacent tubes.

[0017] The machining or ablation of the ends of the terminal portions of the joined platform forms end faces with outer projections that extend around and that protect the channels.

[0018] The provision of end plates with openings to receive the outer projections, and the welding or, otherwise, joining the end plates to the end faces and projections prepares the end plates to be joined to the platform tanks in the pipe ends, or providing inner or outer perimeter rings and welding or otherwise joining the inner and outer perimeter rings prepares the rings to be joined to the rig tanks at the end of the tubes.

[0019] Extending the outer projections through and even to a thickness of the end plates prepares the end plates for welding to the end faces and projections by friction welding or hybrid friction diffusion welding.

[0020] Extending the outer projections through and beyond the end plates prepares the end plates and projections for brazing. The end plates can be brazed or welded to the end faces.

[0021] Bonding thin heat exchanger tubes to piping platform tanks is improved by first extruding thick tubes that have channels or micro channels. Tube material is removed from spaced areas of center portions, leaving fins in thinner heat exchanger center portions and thicker platform end portions. The finned central portions of the tubes are curved, oblique, inclined and twisted. The tubes are aligned horizontally, vertically or angled, and the platform end portions are welded together. Tube material can be removed from the ends of the platform portions to form end faces with projections extending from the end faces and surrounding the channels or micro channels. End plates with openings to receive the projections are attached and sealed to the projections and end faces by soldering or brazing. Faceplates are attached and sealed to openings in deck tanks by welding or brazing, solving the problem of thin heat exchanger tubes joined to piping deck tanks.

[0022] Tubes have one or more channels that extend through the tubes and have elongated central portions and shorter platform portions. The platform portions are thicker than the center portions. In one embodiment, the end faces of the platform portions have outer projections that extend around one or more channels. The outer projections extend outwardly from the end faces of the thick end platform portions. One or more channels are one or more micro channels.

[0023] End plates have internal openings that receive the outer projections. The end plates have internal faces supported and secured to the end faces of the platform portions. The inner openings of the end plates are attached to the outer projections of the end surfaces of the end portions.

[0024] In some embodiments, the end plates and outer projections are of equal length to that of the end faces of the tube, and the end plates are welded to the end faces and outer projections on the end faces of the platform portions . In other embodiments, the outer projections extend beyond the faceplates and the faceplates are brazed to the outer projections.

[0025] The tubes are extruded, and opposite parallel surfaces of the middle portions of the tubes are machined, removing material from the tube and leaving spaced fins integrally formed in the middle portions. In some embodiments, the fins are oblique to a longitudinal direction of the middle portion of the tube.

[0026] Several similar extruded tubes have channels in the tubes and have material removed from the middle portions and spaced fins left in the middle portions of several similar tubes and thick platform portions left at the ends of the various tubes. The platform portions of the tubes are aligned and welded or otherwise joined together before machining the ends of the various joined platform portions of the tubes and create multiple end faces and multiple exterior projections on the various end faces. The various outer projections extend around the channels in the tubes. End plates have a plurality of internal openings that receive the various exterior projections on the end faces of the joined platform portions. The various internal openings of the end plates are welded, brazed or otherwise joined to the various outer projections, and the end plates are welded or otherwise joined to the various end faces.

[0027] The various tubes are aligned horizontally, vertically, or are aligned in a helical parallel curved, oblique, twisted and inclined relationship.

[0028] The tubes are curved, at least partially twisted and oblique and at least partially coiled and twisted and are adapted to form at least part of a helical structure in an overall cylindrical structure having a cylindrical shape. The fins are curved, at least partially twisted and oblique and at least partially curled and twisted and are adapted to form at least part of a helical structure in an overall cylindrical structure having a cylindrical shape.

[0029] In some embodiments, the tubes have curved middle sections and end sections, and the fins on at least one side of the tube are formed slightly concave with central portions of the fins displaced into the outer portions of the fins. The fins on the other side of the tube are slightly convex with center sections of the fins offset away from outer sections of the fins.

[0030] The invention provides a method of extrusion, thick tubes with channels in the tubes, machining of central portions of the tubes, the consequent removal of material in spaced sections from the central portions, formation of fins through the tubes. The method provides thinner central portions of fins, driving platform portions at tube ends, and the existence of angular or circular patterns at tube material thickness transition points.

[0031] The tubes are arranged parallel to each other and are joined at the thickest portions of adjacent tubes. End machining of the joined platform end portions forms end faces. Some end faces have exterior projections that extend around the channels. Some end plates have openings to receive the outer projections. The end plates are then joined to the end faces and some embodiments to the projections.

[0032] The extension of the outer projections through and even with a thickness of the end plates, the union of the end plates with the end faces and projections, if any, is done by friction welding or by hybrid diffusion welding through friction.

[0033] The outer projections extend through and beyond the end plates when joining the end plates to the projections by brazing. Joining the end plates to the end faces is by welding.

[0034] In one form, the method of the invention bends the tubes longitudinally after forming the finned thinner central tubular portions, bends the thinner curved central tubular portions, and bends the thicker curved end tubular portions. The end face projections are curved, and curved openings in the end plates receive the curved projections. The end plates are welded to the end faces and solder or brazed join the end plates to the projections.

[0035] In another form, the method of the invention bends the tubes longitudinally after forming the thinner central tubular portions with fins, bends the thinner curved central tubular portions, and bends the thicker curved end tubular portions. End face projections are curved, and curved perimeter inner and outer rings receive the curved projections. The inner and outer perimeter rings are welded to the end faces and welding or brazing joins the inner and outer perimeter rings to the projections.

[0036] This and other objects and features of the invention are apparent from the disclosure, which includes the written descriptive report continuing above with the claims and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 shows a tube extrusion with micro channels.

[0038] Figure 2 shows the production of perpendicular fins when cutting the material.

[0039] Figure 3A shows the production of angular fins when cutting the material and the consequent formation of a tube provided with monoblock fins with a square pattern at the transition points of tube material thickness.

[0040] Figure 3B shows the production of angular fins when cutting the material and the consequent formation of a tube provided with monoblock fins with an angular pattern at the transition points of tube material thickness.

[0041] Figure 3C shows the production of angular fins when cutting the material and the consequent formation of a tube provided with monoblock fins with a circular pattern at the transition points of tube material thickness.

[0042] Figure 4 shows an extrusion of a tube that has a single port.

[0043] Figure 5 shows the extrusion of the tube shown in Figure 4 after cutting the material and forming perpendicular fins.

[0044] Figure 6 shows the extrusion after cutting the material to form angular fins.

[0045] Figure 7 shows the arrangement of pipes horizontally between flat vertical platform connector plates.

[0046] Figure 8 shows the arrangement of tubes vertically between flat horizontal platform connector plates.

[0047] Figure 9 shows the arrangement of tubes in a cylindrical manner between flat annular platform plates.

[0048] Figure 10 shows curved tubes arranged in a cylindrical manner.

[0049] Figure 11 shows pipes arranged in a helically curved, twisted and inclined manner with inclined ends.

[0050] Figure 12 shows the union of adjacent pipe ends that takes place by friction welding or by hybrid connection by diffusion through friction.

[0051] Figure 13 shows the machining of projections on tube ends.

[0052] Figure 14 shows the flat platform connector board with openings to receive pipe end projections.

[0053] Figure 15 shows pipe ends joined with projections.

[0054] Figure 16 shows pipe ends with projections frictionally welded to the plate.

[0055] Figures 17A and 17B show flattening ends at angles to the obliquity of the tube.

[0056] Figure 18 shows the union of flattened angular ends.

[0057] Figures 19A and 19B show the machining of flat ends joined together to form projections.

[0058] Figures 20A and 20B show a flattened ring plate with openings to receive projections.

[0059] Figures 21A and 21B show the joining of end projections inside the flattened ring plates by friction welding.

[0060] Figure 22 shows a tube with a large end.

[0061] Figure 23 shows the machining of a projection on a pipe end for brazing.

[0062] Figure 24 shows a flat platform connector plate to receive machined ends with projections.

[0063] Figure 25 shows tubes with the large ends and projections ready to be mounted on the platform connector board.

[0064] Figure 26 shows the brazing and the edge on the plate after inserting the projections through the plate.

[0065] Figure 27 shows a set subjected to brazing to compare to fusion welding.

[0066] Figure 28 shows fusion welding compared to brazing in Figures 26 and 27.

[0067] Figure 29A shows the flattening steps of Figures 17A, 17B and 18.

[0068] Figure 29B shows an embodiment in the form of curved, oblique, inclined and twisted tubes in a helical cylindrical arrangement of many tubes without machining.

[0069] Figure 30 shows machined inner and outer perimeter sections of the already welded pipe ends.

[0070] Figure 31 shows a helical coil assembly with upper and lower perimeters machined for the connection of corresponding rings.

[0071] Figure 32 shows the end rings attached to the platform portions and welded areas.

[0072] Figures 33A and 33B show polished flat upper and lower surfaces of solid state coil for additional attachment to platform tanks or reservoirs.

DETAILED DESCRIPTION

[0073] Figure 1 shows a tube extrusion with micro channels. The solid extrusion 10 has multiple passage ports or channels 11 and oblique sides 13 with connecting sidewalls 15.

[0074] Figure 2 shows the production of perpendicular films when cutting the material.

[0075] Portions of material 17 were removed to leave the perpendicular fins 19. The resulting tubes 20 have relatively smaller middle portions 21 and larger ends 23.

[0076] Figure 3A shows the production of angular fins when cutting the material and the consequent formation of a tube provided with monoblock fins with a square pattern at the transition points of tube material thickness.

[0077] Figure 3B shows the production of angular fins when cutting the material and the consequent formation of a tube provided with monoblock fins with an angular pattern at the transition points of tube material thickness.

[0078] Figure 3C shows the production of angular fins when cutting material and the consequent formation of a tube provided with monoblock fins with a circular pattern at the transition points of tube material thickness.

[0079] Figure 4 shows an extrusion of a tube that has a single port. A solid extrusion block 40 cut from a continuous extrusion has a single central port or channel 41, angled side walls 43, and laterally extending connecting side walls 45.

[0080] Figure 5 shows the extrusion of the tube shown in Figure 4 after cutting the material and forming perpendicular fins. Portions 47 that extend through the extrusion have been removed to leave perpendicular fins 49 that extend through the resulting tube 50. The tube 50 has large ends 33 around a smaller center 51.

[0081] Figure 6 shows the extrusion after cutting material to form angular fins. Material was removed from portions 67 of a solid extrusion 40 to leave fins 69 at an angle to the dimensions of the resulting tube 70.

[0082] Figure 7 shows tubes that are arranged horizontally with flat vertical platform plates. Tubes 50 have large ends 53 connected to vertical mounting plates 80 which, in turn, are connected to platform tanks, sumps, shells and covers to create platform chambers (not shown).

[0083] Figure 8 shows tubes that are arranged vertically with horizontal platform plates. Vertically arranged tubes 50 have large ends 53 connected to horizontal mounting plates 82 which are connected to platform chambers.

[0084] Figure 9 shows tubes that are arranged in a circle with circular flat platform plates. Vertically arranged tubes 50 have large ends 53 connected to upper and lower annular mounting plates 84 which are connected to platform chambers.

[0085] Figure 10 shows curved tubes arranged in a circular fashion. Vertically disposed curved tubes 90 have thinner curved central tubular sections 91 and thicker curved end sections 93. Curved openings 97 appear in upper and lower annular mounting plates 95.

[0086] Figure 11 shows pipes arranged in a helically curved, twisted, inclined, with oblique ends. The twisted, bent and helical tubes 100 have larger ends 103 of similar shapes.

[0087] The smaller middle portions 101 of tubes 100 have the continued curved, twisted, inclined and helical shape of the rest of the tubes 100. The platform outer rings 105 are flat for connection to platform reservoirs.

[0088] Figure 12 shows the union of adjacent pipe ends that takes place by friction welding or by hybrid connection by diffusion through friction. Large ends 53 of tubes 50 are joined 110 together by friction welding (FWS) or friction diffusion hybrid bonding (HFDB) 112.

[0089] Figure 13 shows the machining of projections on tube ends. Material 121 is removed from ends 125 of larger ends 53 of tubes 50 that have been joined 110 to leave projections 127.

[0090] Figure 14 shows a flat plate with openings for pipe end projections.

[0091] Figure 15 shows the pipe ends joined with projections.

[0092] Flat plates 130 have openings 137 for receiving and containing the projections 127 of the ends 125.

[0093] Figure 16 shows pipe ends with frictionally welded projections on the plate. The ends 129 of the projections are friction welded 139 to edges of openings 137 in the flat plates. Welding is done on the side facing the chamber 131 of the flat plates.

[0094] Figure 17A shows a single curved, twisted, inclined and helical-shaped tube. The tubes 100 are aligned and the end pieces 103 are removed so that the ends 107 are angled to the tubes and are aligned parallel on opposite end plates.

[0095] In Figure 17B, each curved, twisted, inclined and helically formed tube 100 has flared ends 103 and fins 101. The flared ends must be cut or machined in order to flatten them horizontally.

[0096] Figure 18 shows the union of angular flat ends. The aligned angled end faces 109 of broad end pieces 103 of tubes 101 are friction welded 140 so that complete cylinders of welded tube ends 103 are joined together.

[0097] Figures 19A and 19B show the machining of joined flat ends. The end pieces of material 141 welded together are removed to provide projections 145 as shown in the two figures. The angled removal of portions of the ends and projections around the channel openings in the tubes provides large communicating openings 146 which reduce the refrigerant pressure drop.

[0098] Figures 20A and 20B show a ring with openings to receive the projections. Flat ring 150 has openings 155 for receiving projections 145.

[0099] Figures 21A and 21B show the union of end projections inside the rings by friction welding. Inside edges 157 of openings 155 and end edges 147 of projections 145 are friction welded 159 to reservoir side 151 of flat connecting ring 150.

[00100] Figures 22 to 27 show the joining of tubes and platform connector plates by brazing compared to fusion welding in Figure 28.

[00101] Figure 22 shows a tube with a flared end. Tube 200 is formed with large ends 203 and a relatively thin center section 201. Fins can be formed in the center section by removing material from the extruded tube.

[00102] Figure 23 shows the machining of a projection on a pipe end for brazing. Sections 204 are removed from the ends to leave a projection 205 extending from surfaces 207.

[00103] Figure 24 shows a flat plate to receive machined ends.

[00104] Figure 25 shows brazing tubes on the board.

[00105] The platform connector board 210 has openings 215 to receive the projections 205 on the large ends 203 of tubes 200.

[00106] Figure 26 shows the brazing and the end in the ring after inserting the projections in the ring. Projections 205 extend beyond the platform reservoir side 211 of the platform connector board. Brazing is continuous between surfaces 207, projections 205, complementary outer surfaces 217 and aperture surfaces 215.

[00107] Figure 27 shows a set subjected to brazing to compare with fusion welding.

[00108] Figure 28 shows fusion welding to compare with brazing.

[00109] The protrusion 209 of the projection 205, as shown in Figures 26 and 27, is necessary to prevent the filling material from moving and entering the microports of the tubes.

[00110] Friction welding (FSW) or friction diffusion hybrid bonding (HFDB) does not require extending the projections 225 beyond the reservoir side 231 of the platform connection plate 230.

[00111] In one embodiment of the invention, the tubes are made without protrusions on end faces. The step of machining the end faces to produce protrusions by removing material from the end faces is avoided.

[00112] Figure 29A shows the flattening steps of Figures 17A, 17B and 18. The tubes 100 are aligned and the end parts 103 are removed so that the ends 107 are angled to the tubes and are aligned parallel to the opposite end plates . Each twisted, bent, and helical bent tube 100 has flared ends 103 and fins 101. Aligned angled end faces 109 of wide end portions 103 of tubes 101 are friction welded 140 so that complete cylinders of welded tube ends 103 are joined in set.

[00113] Figure 29B shows such embodiment in the form of curved, oblique, inclined and twisted tubes 300 in a cylindrical arrangement of helical tube 350, as shown in Figures 11, 17A, 17B and 21B. Portions of platform 333 are shown without machining and flattening.

[00114] Figure 30 shows the machined inner perimeter 442 and the machined outer perimeter 444. The welded areas 440 are shown between the machined perimeter areas 442 and 444 of the flat platforms 446.

[00115] Figure 31 shows a helical coil arrangement 600 of curved, twisted, inclined and oblique tubes 400 with machined inner perimeters 450 and 451, machined outer perimeters 452 and 454 together with their corresponding upper connection end rings 462 and 462 and lower connecting end rings 474 and 476.

[00116] Figure 32 shows the end rings 462, 464, 474 and 476 respectably attached to the platform portions 480 and 481, the upper welding areas 482 between adjacent upper tube platforms 480 and the upper welding areas of perimeter 484 and 486 between the upper end rings 462 and 464 to the upper tube platforms 480. The outer areas 478 are shown extending outward from the joined lower platforms 481.

[00117] Figure 33A and 33B show a welded set of propeller coils in Solid State 700 with upper and lower surfaces re-machined and/or polished 500 and 502 in a respectable way to additionally be connected to coil platform tanks or reservoirs.

[00118] The storytelling graphics, pages 1, 2, 3, 4 and 5, on the next pages 18 to 22 describe by illustration and label the formation and union of pipe ends by steps of clipping and flattening platforms, welding of adjacent platforms in areas spaced from the channels, machining of platform faces, use of platform end plates and polishing the ends of so-called robust structures in Solid State.

[00119] Although the invention has been described with reference to specific embodiments, modifications and variations of the invention can be constructed without deviating from the scope of the invention, which is defined in the following claims.

Claims (21)

1. APPARATUS, characterized by comprising: a heat exchanger tube having: a relatively thin central portion, relatively thick platform portions at the ends of the relatively thin central portion, fins extending out of the central portion, end faces in ends of the platform portions remote from the central portion and at least one channel extending through the tube. 2. APPARATUS, according to claim 1, characterized in that it further comprises progressive transition portions between relatively thin central portions and relatively thick platform portions. 3. APPARATUS, according to claim 1, characterized in that the heat exchanger tube is extruded with the thickness of the platform portions and with the at least one channel that extends through the tube and in which the material is removed from the sides of the tube in sections spaced from the central portion, which leaves the fins. 4. APPLIANCE according to claim 1, characterized in that the tube is longitudinally curved. 5. APPLIANCE according to claim 1, characterized in that the tube is oblique, twisted and inclined. 6. APPLIANCE, according to claim 5, characterized in that the fins are angled in relation to a longitudinal direction of the tube. 7. APPARATUS, according to claim 1, characterized in that it further comprises several tubes arranged adjacent to each other a tight pressed fit between the platform portions of the tubes, in which the ends of the platform portions are flattened by cutting or machining ends of the platform portion and where flattened ends are joined. 8. APPLIANCE according to claim 7, characterized in that the platform rings are placed tightly on inner and outer perimeter surfaces of the flattened ends and are joined with the flattened ends by friction welding. 9. APPLIANCE according to claim 8, characterized in that the ends of the platform portions are joined by fiction welding, moving away from the areas around the openings of the at least one channel at the ends of the platform portions. Apparatus according to claim 1, characterized in that the flattened joined ends of the platform portions of the tubes and the platform rings are polished and ready to be used as a heat exchanger. 11. APPARATUS, according to claim 6, characterized in that it further comprises several tubes arranged adjacent to each other with a tight pressed fit between the tube platform portions and in which the ends of the tubes are flattened by machining or cutting. and by further machining the flattened end projections of the ends and continuous flat end face surfaces are formed around the projections at the ends of the tubes. 12. APPLIANCE, according to claim 11, characterized in that it further comprises face plates that have openings that receive the projections joined to the flat end faces by welding. 13. APPARATUS, according to claim 12, characterized in that the projections are extended through and beyond the openings in the face plates, the openings in the face plates and the projections are sealed by brazing. 14. METHOD, comprising forming heat exchanger tubes by extruding relatively thick flat tubes that have at least one relatively thin channel extending through the tubes, machining or ablating spaced sections into central portions, leaving relatively thin central portions thin with spaced fins extending through the tubes and relatively thick platform portions at the ends of the tubes with channel openings at the ends of the platform portions. 15. METHOD according to claim 14, further comprising arranging several tubes close together and pressing the platform portions together in a tight pressed fit between the platform portions and holding the platform portions together . 16. METHOD, according to claim 15, characterized in that it further comprises initially bending the tubes. 17. METHOD, according to claim 15, characterized in that it further comprises initially forming the fins at an angle with the tubes and the curvature, obliqueness, inclination and twist of the tubes before pressing the platform portions together, flattening the ends of the tubes by cutting - if or by machining the ends of the tubes, place rings tightly around the flat ends of the tubes, join the rings and flat ends by friction welding and join adjacent tube ends by friction welding, which leaves areas around the channels free from welding and polishing the joined ends of the tubes and the joined end surfaces of the rings. 18. METHOD, according to claim 15, characterized in that it further comprises initially forming the fins at an angle to the tubes and bending, obliqueness, inclination and twisting of the tubes before pressing the platform portions together, flattening the ends of the tubes cutting or machining tube ends to unitary flat surfaces, further machining tube ends to form and leave projections of tube material around channel openings at tube ends and leave end faces of platform portions along around the projections, provide end plates that have openings to receive the projections, place the end plates on the end faces and friction weld the end plates on the end faces. 19. METHOD according to claim 18, characterized by further comprising friction welding the openings in the end plates to the sides of the projections. 20. METHOD according to claim 18, further comprising extending the projections through openings in the end plates and brazing the projections to the openings in the end plates. 21. APPARATUS, characterized by comprising a heat exchanger having several identical monobloc coils formed by extruded flat tubes with channels, opposite spaced side sections removed from the central sections leaving angular fins in a relatively thin central section and relatively thick platform sections at the ends of the pipes, where the pipes are angled, bent and twisted and have the center sections aligned and the platform sections pressed together in a tight fit with the flat end faces machined and joined with welds between adjacent end faces and welded areas spaced from areas around pipes and polished end surfaces.

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