BR112020006005A2 - apparatus and method - Google Patents

Abstract

It is the union of thin tubes of heat exchanger with tubing 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 central portions, which leaves thin central portions of the heat exchanger with fins and thicker portions of the platform. The tubes are curved, twisted and inclined. The tubes are aligned horizontally, vertically or angled 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. The end plates with openings to receive the projections are fixed and sealed to the projections and end faces by welding or brazing. The face plates are fixed and sealed to the openings in the platform tanks by welding or brazing. Tube ends are flat. Rings are added. Ends and rings are friction welded, avoiding areas around the channel openings, and polished.

Description

APPARATUS AND METHOD

[001] This application claims the benefit of Provisional Application Serial Number U.S. 62 / 563,382 filed on September 26, 2017, which is incorporated herein by reference in its entirety as if it were fully established 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 the tubes is a problem. Connecting pipe ends to platform tanks is a more serious problem. When interruptions occur in connections, leaks develop this internal exhaust fluid and exterminate the heat exchangers used in air conditioning, heating, energy and cooling systems, for example. Vibrations and bimetallic corrosion of the cell cause interruptions in the connections.

[003] Heat exchanger tube ends are connected to openings in the platform tanks at the ends of the tubes. Connecting the tubes to the friction-welded platform tanks is not a solution because the relatively thin ends of the tube are deformed. Friction temperatures need to fuse 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 leakage of heat exchange and to problems of joining pipe to the platform in heat exchangers.

SUMMARY OF THE INVENTION

[005] The present invention solves the problems of leakage 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. The large ends of the tubes are machined flat. The material is removed from the flat ends to leave projections that have material around the channels in the tubes.

[007] The 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 on the platform face plates. The tube ends are joined together and are joined with the platform face plates by friction welding or brazing. The projections of the pipe ends are either welded by friction or brazed through the openings in the platform plate. When the pipe ends are joined together by brazing, the projections of the pipe ends extend into the platform chamber from the side of the platform face plate. The braze extends from the sides of the pipe ends, between the flat surfaces of the pipe ends and the platform face plates and along the projections that extend through the openings in the platform face plates.

[008] When the pipe ends and projections are welded to the platform face plates, the pipe ends are leveled 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 ends of the pipe are frictionally welded to the platform face plates. The intersecting edges of the platform face plates and the platform body are frictionally welded together.

[009] Important features of the new intervention are and include: ● large ends in heat exchange tubes, ● angular or circular patterns at the thick transition points of tube material, when passing from the thick portions to the thin portions of the tube and vice versa, ● attach the large ends to the heat exchanger face plates and / or, ● attach the large ends of the heat exchanger tubes to each one, ● flatten the end surfaces of the increased ends of the 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 the openings in the heat exchanger platform connector face plates, ● join the projections and the flat surfaces of the heat exchanger tubes to the heat exchanger platform face plates, ● weld edges of the projections and edges of the large ends by friction to the corresponding edges between the heat exchanger platform face plates, ● when brazing, extend the projections across and beyond the face plate and braze the projection surfaces and the ends of the large flat ends of the tubes onto the face plates heat exchanger, ● join all enlarged ends together in a fixed pattern, ● where the fixed pattern is circular.

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

[0011] The end plates have internal openings to receive the external projections. The end plates have internal faces supported, secured and sealed on the end faces of the platform end portions. The internal 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 the external projections are of equal length to that of the end faces of the tubes in one mode. 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 mode, the external projections extend beyond the face plates and the face plates are brazed to the outside projections. The extension of the projections beyond the face plates prevents the migration of the brazing material in the tube channels.

[0014] The tubes are extruded, and the opposite surfaces of the middle portions of the tube are machined or subjected to ablation to remove sections of the tube material and to leave the 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 micro channels.

[0015] Several similar extruded tubes have channels inside the tubes. The material is removed from the middle portions of the tubes, and the spaced fins are left in the medium thin portions. The thick end portions of the platform are left at the ends of the various tubes that have angular or circular patterns at the thick transition points of tube material. The various tubes are aligned horizontally or vertically or are curved, twisted and oblique with the tubes twisted and inclined in parallel helical relationship. The platform end portions of the various tubes are aligned and joined together by welding before machining or ablating the ends of the various platform end portions joined together to create multiple end faces and multiple outer projections on the various end faces. The various exterior projections extend around and protect the channels. The various exterior projections are joined to the flat end plates or to the inner and outer perimeter rings. The end plates have several internal openings which receive the various outer projections on the various end faces of the joined platform end portions. The various internal openings of the end plates are welded or, if not, joined to the various external projections. The end plates are welded or, if not, joined to the various end faces.

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

[0017] The machining or ablation of ends of the terminal portions of the united 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 external projections, and the welding or, otherwise, joining of 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 supply of inner or outer perimeter and welding rings or, otherwise, joining the inner and outer perimeter rings prepares the rings to be joined to the platform tanks at the end of the tubes.

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

[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] Union of thin tubes of heat exchanger to tubing platform tanks is improved first by extruding thick tubes that have channels or micro channels. The tube material is removed from spaced areas of central portions, leaving fins on thinner central heat exchanger portions and on thicker platform end portions. The central portions provided with fins of the tubes are curved, oblique, inclined and twisted. The tubes are aligned horizontally, vertically or angularly, and the platform end portions are welded together. The 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 the end faces by welding or brazing. The face plates are secured and sealed to openings in the platform tanks by welding or brazing, solving the problem of thin heat exchanger tubes connected to the pipe platform 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 central portions. In one embodiment, the end faces of the platform portions have exterior projections that extend around one or more channels. The outer projections extend outwardly from the end faces of the thick end portions of the platform. One or more channels are one or more micro channels.

[0023] End plates have internal openings that receive the external projections. The end plates have internal faces supported and attached to the end faces of the platform portions. The internal 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 to the outer projections on the end faces of the platform portions . In other modalities, the external projections extend beyond the face plates and the face plates are brazed to the outside projections.

[0025] The tubes are extruded, and opposite parallel surfaces of the middle portions of the tubes are machined, removing the material from the tube and leaving spaced fins formed integrally 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 ends of the various joined portions of the tubes and create multiple end faces and multiple outer projections on the various end faces. The various exterior projections extend around the channels in the tubes. End plates have several internal openings that receive the various outer projections on the end faces of the joined platform portions. The various internal openings in the end plates are welded, brazed or otherwise joined to the various exterior 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 curved, oblique, twisted and inclined parallel helical relationship.

[0028] The tubes are curved, at least partially twisted and oblique and at least partially rolled and twisted and are adapted to form at least part of a helical structure in a general cylindrical structure that presents 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 a general cylindrical structure that presents a cylindrical shape.

[0029] In some embodiments, the tubes have medium curved sections and end sections, and the fins on at least one side of the tube are formed slightly concave with the central parts of the fins displaced into the outer parts of the fins. The fins on the other side of the tube are slightly convex with central sections of the fins displaced out of the outer sections of the fins.

[0030] The invention provides an extrusion method, 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 finer central portions of fins, conduction of platform portions at the ends of tubes and the existence of angular or circular patterns at the transition points of thick tube material.

[0031] The tubes are arranged parallel to each other and are joined in 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 for receiving exterior projections. The end plates are then attached to the end faces and some modalities 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 the projections, if any, are by friction welding or by hybrid diffusion welding through friction.

[0033] The outer projections extend through and beyond the end plates when the joining of the end plates to the projections occurs by brazing. The end plates are joined to the end faces by welding.

[0034] In one form, the method of the invention curves the tubes longitudinally after the formation of the finer central portions with fins, curves the thinner curved central portions and curves the thicker curved end portions. The projections of the end faces are curved, and curved openings in the end plates receive the curved projections. The end plates are welded to the end faces and welding or brazing joins the end plates to the projections.

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

[0036] This and other objects and resources of the invention are apparent in the disclosure, which includes the continuous written specification 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 monobloc fins with square pattern at the transition points of thickness of the tube material.

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

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

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

[0043] Figure 5 shows the extrusion of the tube shown in Figure 4 after cutting 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 tubes horizontally between flat vertical platform connector plates.

[0046] Figure 8 shows the arrangement of tubes in a vertical way between flat horizontal platform connector plates.

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

[0048] Figure 10 shows curved cylindrical tubes.

[0049] Figure 11 shows tubes helically arranged curved, twisted and inclined with inclined ends.

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

[0051] Figure 13 shows the machining of projections at pipe ends.

[0052] Figure 14 shows the flat platform connector plate with openings for receiving pipe end projections.

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

[0054] Figure 16 shows tube ends with frictionally welded projections on the plate.

[0055] Figures 17A and 17B show flattening ends at angles in relation 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 for receiving projections.

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

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

[0061] Figure 23 shows the machining of a projection on one end of a brazing tube.

[0062] Figure 24 shows a flattened connector plate for receiving machined ends with projections.

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

[0064] Figure 26 shows the brazing and the end of the plate after inserting the projections through the plate.

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

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

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

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

[0069] Figure 30 shows internal and external perimeter sections machined from already welded pipe ends.

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

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

[0072] Figures 33A and 33B show polished solid top and bottom coil surfaces in solid state 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 passageways or channels 11 and oblique sides 13 with connecting side walls 15.

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

[0075] Portions of material 17 have been removed to leave the perpendicular fins 19. The resulting tubes 20 have relatively smaller average 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 monobloc fins with a square pattern at the transition points of thickness of tube material.

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

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

[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 door or channel 41, oblique side walls 43 and side connecting walls that extend sideways 45.

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

[0081] Figure 6 shows the extrusion after cutting material to form angular fins. The 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 the vertical flat platform plates. The tubes 50 have large ends 53 connected to vertical mounting plates 80 which, in turn, are connected to the platform tanks, reservoirs, housings 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 annular upper and lower mounting plates 84 which are connected to platform chambers.

[0085] Figure 10 shows curved tubes arranged in a circular fashion. Vertically arranged curved tubes 90 have thinner curved center tubular sections 91 and thicker curved end sections

93. Curved openings 97 appear on upper and lower annular mounting plates 95.

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

[0087] The smaller medium portions 101 of tubes 100 have the continuous curved, twisted shape,

inclined and helical from the rest of the tubes 100. The outer platform rings 105 are flat for connection to platform reservoirs.

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

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

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

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

[0092] Flat plates 130 have openings 137 to receive and contain the projections 127 of the ends

125.

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

[0094] Figure 17A shows a single curved, twisted, inclined and helically shaped tube. 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.

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

[0096] Figure 18 shows the union of flattened angular ends. The aligned angled end faces 109 of wide end pieces 103 of tubes 101 are frictionally welded 140 so that the full welded tube end cylinders 103 are joined together.

[0097] Figures 19A and 19B show the machining of joined flat ends. The material parts 141 of the ends welded together are removed to provide projections 145 as shown in the two figures. The angular removal of parts of the ends and the projections around the channel openings in the tubes provide large communication openings 146 that reduce the refrigerant pressure drop.

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

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

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

[00101] Figure 22 shows a tube with an enlarged 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 one end of a brazing tube. Sections 204 are removed from the ends to leave a projection 205 that extends from surfaces 207.

[00103] Figure 24 shows a flat plate for receiving machined ends.

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

[00105] The platform connector plate 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. The projections 205 extend beyond the platform reservoir side 211 of the platform connector plate. Brazing is continuous between surfaces 207, projections 205, complementary external surfaces 217 and opening surfaces 215.

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

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

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

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

[00111] In an embodiment of the invention, the tubes are made without protrusion on end faces. The step of machining 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, inclined and helical curved tube 100 has enlarged ends 103 and fins 101. Aligned angled end faces 109 of wide end parts 103 of tubes 101 are friction welded 140 so that full cylinders of welded tube ends 103 are joined in set.

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

[00114] Figure 30 shows the machined internal perimeter 442 and the machined external perimeter 444. The welded areas 440 are shown between the machined perimeter areas 442 and 444 of the flattened platforms 446.

[00115] Figure 31 shows an arrangement of helical coil 600 of curved, twisted, inclined and oblique tubes 400 with machined internal perimeters 450 and 451, machined external perimeters 452 and 454 together with their corresponding upper connection end rings 462 and 462 and the 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 pipe 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 extended outside the joined lower platforms 481.

[00117] Figure 33A and 33B show a welded set of solid state propeller coils 700 with top and bottom surfaces re-machined and / or polished 500 and 502 in a respectable manner to additionally be connected to coil platform tanks or reservoirs.

[00118] The storytelling graphs, pages 1, 2, 3, 4 and 5, on the next pages 18 to 22 describe by illustration and label the formation and joining of pipe ends by stapling and flattening stages, welding of adjacent platforms in areas spaced from the channels, machining of platform faces, use of platform end plates and polishing the ends of solid structures in solid state.

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

Claims (21)

1. APPLIANCE, characterized by comprising: a heat exchanger tube which has: a relatively thin central portion, relatively thick platform portions at the ends of the relatively thin central portion, fins extending out from the central portion, end faces in ends of the remote platform portions of the central portion and at least one channel extending through the tube. 2. APPLIANCE according to claim 1, characterized in that it also comprises portions of progressive transition between the relatively thin central portions and the relatively thick platform portions. 3. APPLIANCE according to claim 1, characterized in that the heat exchanger tube is extruded with the thickness of the platform portions and with at least one channel extending through the tube and in which the material is removed from the sides of the tube in spaced sections of the central portion, which leaves the fins. Apparatus 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. APPLIANCE, according to claim 1, characterized in that it also 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 at which flattened ends are joined. APPARATUS, according to claim 7, characterized in that the platform rings are placed tightly on the inner and outer perimeter surfaces of the flattened ends and are joined with the flattened ends by friction welding. 9. Apparatus according to claim 8, characterized in that the ends of the platform portions are joined by welding by fiction, moving away from the areas around the openings of at least one channel at the ends of the platform portions. 10. 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 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. Apparatus according to claim 11, characterized in that it also comprises face plates that have openings that receive the projections joined to the flat-end faces by welding. 13. APPLIANCE, according to claim 12, characterized in that the projections are extended through and in addition to the openings in the face plates, the openings in the face plates and the projections are sealed by brazing. 14. METHOD, characterized by comprising forming heat exchanger tubes by extruding relatively thick flat tubes that have at least one relatively thin channel that extends through the tubes, machining or ablating sections spaced in central portions, which leave relatively central portions thin with spaced fins that extend 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, characterized by further comprising the arrangement of several tubes close together and the pressure of the platform portions together in a tightly pressed fit between the platform portions and the retention of the platform portions together . 16. METHOD, according to claim 15, characterized in that it also comprises initially bending the tubes. 17. METHOD, according to claim 15, characterized in that it also comprises initially forming the fins at an angle with the tubes and the curvature, obliquation, inclination and twisting 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 the flat ends by welding by friction and join adjacent ends of the tubes by welding by friction, which leave areas around the weld free channels and polish the joined ends of the tubes and the joined end surfaces of the rings. 18. METHOD, according to claim 15, characterized in that it also comprises initially forming the fins at an angle with the tubes and the curvature, obliquation, inclination and twisting of the tubes before pressing the platform portions together, flatten the ends of the tubes by cutting or machining the ends of the tubes to single flat surfaces, further machining the ends of the tubes to form and leave projections of the tube material around the channel openings at the tube ends and leave end faces of the platform portions at the around the projections, provide end plates that have openings to receive the projections, place the end plates on the end faces and frictionally weld the end plates on the end faces. 19. METHOD, according to claim 18, characterized in that it also includes friction welding of the openings in the end plates on the sides of the projections. 20. METHOD, according to claim 18, characterized in that it also comprises extending the projections through the openings in the end plates and brazing the projections to the openings in the end plates. 21. APPLIANCE, characterized by comprising a heat exchanger that has several identical monobloc coils formed by extruded flat tubes with channels, opposite spaced side sections removed from the central sections that leave angular fins in a relatively thin central section and relatively thick platform sections at the ends of the tubes, the tubes being oblique, inclined and twisted and have the central sections aligned and the platform sections pressed together in tight fit with the flat end faces machined and joined with welds between the adjacent end faces and the welded areas spaced from the areas around the pipes and the polished end surfaces.