JP7203097B2 - tube joint - Google Patents

Description

This application claims the benefit of U.S. Provisional Patent Application No. 62/563,382, filed September 26, 2017, which is fully incorporated herein in its entirety. incorporated herein by reference as if

Heat exchangers and air conditioning systems present major problems. Heat transfer tubes with added fins have many connections. Connecting the fins to the tube is one problem. Connection of tube ends to header tanks is a more serious problem. When a connection breaks, it creates a leak that drains the internal fluid, causing the failure of heat exchangers used in, for example, air conditioning, heat, power, and refrigeration systems. Vibration and corrosion of bimetallic batteries cause connection failure.

The ends of the heat exchanger tubes are connected to openings in header tanks at the ends of the tubes. Connecting the tube to the header tank by friction welding is not a solution because the relatively thin tube ends are deformed. The frictional temperatures required to melt and weld the tube ends and headers distort and destroy the tube ends and ports/channels.

A solution is needed to the problems of heat exchanger leakage and heat exchanger tube-to-header joint problems.

The present invention solves the leak-rupture problem of heat exchangers used, for example, in heat, power, air conditioning, and refrigeration systems.

The present invention provides a tube having a relatively thin center section to facilitate heat exchange and large, thick end sections for joining to headers. The large end of the tube is machined flat. Material is removed from the flat end to leave a protrusion with material surrounding the channel of the tube.

An opening is formed in the header to accommodate the shape of the material surrounding the channel in the tube. In one embodiment, the large tube ends fit into the header face plate. The tube ends themselves are joined together and joined to the header face plate by friction welding or brazing. The tube end projections are friction welded or brazed to the openings in the header plate. When the tube ends are joined together by brazing, the tube end protrusions extend from the side of the header face plate into the header chamber. The braze extends from the side of the tube end between the flat surface of the tube end and the header face plate and along the protrusion that extends through the opening in the header face plate.

When the tube ends and projections are welded to the header face plate, the tube ends are welded flush with the header plate opening on the header side of the face plate. The tube ends and the edges of the large flat tube ends are friction welded to the header face plate. The edges where the header face plate and header body intersect are friction welded together.

An important feature of the new invention is the large end of the heat exchange tube and the angled or circular pattern at the tube material thickness transition point when going from the thicker portion of the tube to the thinner portion and vice versa. bonding the ends to the heat exchanger face plate and/or bonding the large ends of the heat exchanger tubes together; flattening the end faces of the enlarged ends of the heat exchanger tubes; Removing material from the flattened ends of the heat exchanger tubes to form protrusions surrounding the inner channels of the tubes and inserting the protrusions into openings in the heat exchanger header connector face plate. bonding the projections and the flat surface of the heat exchanger tubes to the heat exchanger header face plate; and bonding the edges of the projections and the large end edges to the heat exchanger header Friction welding to the corresponding edges of the face plate and extending the protrusions through the face plate when brazed so that the surface of the protrusions and the surface of the flat large end of the tube are heat exchanged. and joining all of the enlarged ends in a fixed pattern. Here, the fixed pattern is circular.

The present invention provides a tube having one or more channels and having a long, thin central heat exchange section and shorter end header sections. The end header portions are thicker than the thin central heat exchange portion. It has an angled or circular pattern at the transition point of the tubing material thickness. The end face of the distal portion is machined or flattened to provide an outward projection that extends around and protects the one or more channels. The outwardly projecting portion extends from the smooth, flat end surface of the thick distal header portion.

The end plate has an inner opening for receiving the outward projection. The end plate has an inner surface that abuts, attaches and seals to the end face of the terminal header portion. The inner opening of the end plate is attached and sealed to the outwardly projecting portion of the end face of the distal portion.

In one embodiment, the end plate and the outward projection are coextensive from the end face of the tube. The end plate is welded to the end face and to the outwardly projecting portion on the end face of the terminal header portion.

In another embodiment, the outward projection extends beyond the face plate and the face plate is brazed to the outward projection. Extending the protrusion beyond the face plate prevents migration of brazing material into the tube channel.

The tube is extruded and both sides of the central portion of the tube are machined or removed to remove areas of the tube material, leaving integrally formed spaced fins in the thin central portion. The fins are angled with respect to the longitudinal direction of the central portion of the tube and the one or more channels are one or more microchannels.

A plurality of similar extruded tubes have channels within the tubes. Material is removed from the central portion of the tube, leaving spaced fins in the thin central portion. A thick terminal header portion is left at the ends of the plurality of tubes. The plurality of tubes has an angled or circular pattern at transition points in the thickness of the tube material. The multiple tubes are aligned horizontally or vertically, or curved, twisted, or tilted. The twisted and angled tubes are in a parallel helical relationship. The plurality of tube end header portions are aligned and joined together by welding, machining or removing ends of the plurality of joined end header portions, and forming a plurality of end faces and a plurality of outward projections at the plurality of end faces. Make a part. A plurality of outward projections extend around and protect the channel. A plurality of outward projections are joined to either the flat end plate or the inner and outer rings. The end plate has a plurality of inner openings that receive a plurality of outward projections on the end faces of the joined end header portions. A plurality of inner openings in the end plate are welded or otherwise joined to a plurality of outward projections. An end plate is welded or otherwise joined to the plurality of end faces.

The new method is to extrude a wide, thick tube with channels in the tube, then machine or flatten the central portion of the tube, remove material in areas spaced from the central portion, and thin the central portion. , forming fins across the tubes to leave thicker terminal header portions at the ends of the tubes and having an angled or circular pattern at the transition points of the thickness of the tube material to position the tubes parallel to each other and adjacent Including welding or otherwise joining the end portions of the tube.

The ends of the joined end header portions are machined or flattened to form end faces with outward projections that extend around and protect the channels.

The end plate is located at the end of the tube by providing an end plate with an opening for receiving the outward projection and welding or otherwise joining the end plate to the end face and the projection. Ready to be joined to the header tank. Alternatively, by providing inner and outer rings and welding or otherwise joining the inner and outer rings, the rings are ready to be joined to the header tanks at the ends of the tubes.

By extending the outward projections through the thickness of the end plate, the end plate is ready to be welded to the end faces and projections by friction stir welding or hybrid friction diffusion welding.

By extending the outward projections through the end plate, the end plate and projections are ready for brazing. The end plates can be brazed or welded to the end faces.

The joining of thin heat exchanger tubes to manifold header tanks is improved by first extruding thick tubes with channels or microchannels. Tubing material is removed from spaced regions of the center section, leaving fins in the thinner heat exchanger center section and thicker end header sections. The finned central portion of the tube is curved, slanted, tilted and twisted. The tubes are aligned horizontally, vertically or at an angle and the end header portions are welded together. Tubing material can be removed from the end of the header portion to form an end face, with projections extending from the end face and surrounding the channel or microchannel. An end plate having an opening for receiving the projection is attached and sealed to the projection and end face by welding or brazing. The face plate is attached and sealed to the opening of the header tank by welding or brazing to solve the problem of joining the thin heat exchanger tubes to the manifold header tank.

The tube has one or more channels extending therethrough and has a long central portion and a shorter header portion than the central portion. The header portion is thicker than the central portion. In one embodiment, the end face of the header portion has outward projections extending around the one or more channels. An outward projection extends outwardly from the end face of the thick distal header portion. One or more channels are one or more microchannels.

The end plate has an inner opening that receives the outward projection. The end plate has an inner surface that is mounted against the end surface of the header portion. The inner opening of the end plate is attached to the outwardly projecting portion of the end face of the distal portion.

In some embodiments, the end plate and the outward projection are coextensive from the end face of the tube, and the end plate is welded to the end face and the outward projection of the end face of the header portion. In other embodiments, the outward projection extends beyond the face plate and the face plate is brazed to the outward projection.

The tube is extruded and parallel sides of the central portion of the tube are machined to remove material from the tube, leaving spaced fins integrally formed in the central portion. In some embodiments, the fins are angled with respect to the longitudinal direction of the central portion of the tube.

A plurality of similar extruded tubes having channels within the tubes, material removed from the central portion, leaving spaced fins in the central portion of the plurality of similar tubes, and the ends of the plurality of tubes , a thick header portion is left. Header portions of the tube are aligned and welded or otherwise joined together, machining the ends of the plurality of joined header portions of the tube, and forming a plurality of end faces and a plurality of outward facing portions at the plurality of end faces. Produce a protrusion. A plurality of outward projections extend around the channel of the tube. The end plate has a plurality of inner openings that receive a plurality of outward projections on the end faces of the joined header portions. The plurality of inner openings of the end plate are welded, brazed, or otherwise bonded to the plurality of outward projections, and the end plate is welded or otherwise bonded to the plurality of end faces.

The multiple tubes are aligned horizontally or vertically, or in curved, angled, twisted and angled parallel helical relationship.

The tube is adapted to be curved, at least partially twisted and slanted, and at least partially wound and twisted to form at least a portion of a helical structure in an overall cylindrical structure having a cylindrical shape. . The fins are adapted to be curved, at least partially twisted and slanted, and at least partially rolled and twisted to form at least a portion of a helical structure in an overall cylindrical structure having a cylindrical shape. .

In some embodiments, the tube has curved central and end sections, and the fins on at least one side of the tube are offset inwardly from the outer portions of the fins. It is formed in a slightly concave shape. The fins on the other side of the tube are slightly convex, with the central section of the fins offset outwardly from the outer section of the fins.

The present invention extrudes a wide, thick tube with channels in the tube, machine the central portion of the tube, thereby removing material in areas spaced from the central portion, and forming fins across the tube. provide a way. This method provides thin fins in the central portion and leaves header portions at the ends of the tube with an angled or circular pattern at the transition points of the thickness of the tube material. The tubes are arranged parallel to each other and joined at the thick sections of adjacent tubes. An end face is formed by machining the ends of the joined end header portions. Some end faces have outward projections that extend around the channel. Some end plates have openings to receive the outward projections. An end plate is then bonded to the end face and, in some embodiments, to the protrusion.

The outward projections are extended through the thickness of the end plate so that the end plate is joined to the end face and projections, if present, by friction stir welding or hybrid friction diffusion welding. done.

The outward projection extends through the end plate when the end plate is joined to the projection by brazing. The joining of the endplates to the endfaces is by welding.

In one form, the method of the present invention forms a thin central section with fins, then bends the tube longitudinally, bends the thin curved tube central section, and bends the thick curved tube end sections. The protrusion from the end face is curved and the curved opening in the end plate receives the curved protrusion. The end plate is welded to the end face and welded or brazed to join the end plate to the projection.

In another form, the method of the present invention forms a thin central section with fins, then bends the tube longitudinally, bends the thinner curved tube central section, and bends the thick curved tube end sections. The protrusions from the end faces are curved and curved inner and outer rings receive the curved protrusions. Inner and outer rings are welded to the end faces and welded or brazed to join the inner and outer rings to the protrusion.

These, further, and other objects and features of the present invention are apparent in this disclosure, including the foregoing and following specification, together with the claims and drawings.

Figure 2 shows a tube extrusion with microchannels. Fig. 3 shows vertical fins made by cutting out material; Figure 10 shows angled fins made by cutting material, thereby forming a monoblock finned tube with a square pattern at the transition points of the thickness of the tube material. FIG. 10 illustrates angled fins made by cutting material, thereby forming a monoblock finned tube with an angled pattern at the transition points in the thickness of the tube material. Figure 10 shows an angled fin made by cutting material thereby forming a monoblock finned tube with a circular pattern at the transition point of the thickness of the tube material. Fig. 3 shows an extrusion of a tube with a single port; 5 shows the tube extrusion of FIG. 4 after material has been cut to form vertical fins. 4 shows the extrudate after cutting the material to form the angled fins. Fig. 3 shows horizontal placement of tubes between flat vertical header connector plates; Fig. 3 shows the vertical arrangement of tubes between flat horizontal header connector plates; Fig. 3 shows a cylindrical arrangement of tubes between flat annular header plates; Fig. 3 shows curved tubes arranged in a cylinder; FIG. 3 shows a curved, twisted, angled, helically arranged tube with slanted ends; FIG. Figure 2 shows the joining of adjacent tube ends by friction stir welding or hybrid friction diffusion welding. Figure 3 shows the machining of the protrusions on the tube ends. Fig. 3 shows a flat header connector plate with openings for receiving tube end projections; FIG. 10 shows a tube end joined with a protrusion; Fig. 3 shows a tube end with a protrusion friction welded to a plate; FIG. 10 shows a flattened end view at an angle to the tilt of the tube. FIG. 10 shows a flattened end view at an angle to the tilt of the tube. Fig. 10 shows a flattened angled end bond; Figure 10 shows the machining of joined flat ends to form protrusions. Figure 10 shows the machining of joined flat ends to form protrusions; Fig. 3 shows a flat ring plate with openings for receiving protrusions; Fig. 3 shows a flat ring plate with openings for receiving protrusions; Fig. 3 shows the joining of end protrusions in a flat ring plate by friction welding; Fig. 3 shows the joining of end protrusions in a flat ring plate by friction welding; A tube with large ends is shown. Fig. 3 shows the machining of protrusions for brazing on tube ends; Fig. 3 shows a flat header connector plate for receiving a machined end with protrusions; Fig. 3 shows a tube with large ends and protrusions prepared to be mounted on and in a header connector plate; FIG. 10 shows the brazing of the ends at the plate after insertion of the protrusion through the plate; FIG. A brazed assembly is shown for comparison with fusion welding. FIG. 28 shows a fusion weld compared to the brazing of FIGS. 26 and 27; FIG. Figures 17A, 17B and 18 show the planarization step. Embodiments of curved, slanted, tilted and twisted shapes in a helical cylindrical arrangement of many tubes in the unmachined state. Figure 2 shows the machined inner and outer perimeter areas of the already welded tube ends. Fig. 3 shows a helical coil assembly with machined top and bottom perimeters for connecting corresponding rings; The end rings attached to the header portion and the welded areas are shown. Figure 3 shows the polished flat surfaces of the top and bottom solid state coils for further attachment to a header tank or vessel. 1 shows explanatory chart page 1; 2 shows explanatory chart page 2; 3 shows explanatory chart page 3; 4 shows explanatory chart page 4; 5 shows explanatory chart page 5;

FIG. 1 shows a tube extrusion with microchannels. Solid extrusion 10 has a plurality of through ports or channels 11 and sloped sides 13 with connecting sidewalls 15 .

FIG. 2 shows the creation of vertical fins by cutting material. A portion of material 17 is removed, leaving vertical fins 19 . The resulting tube 20 has a relatively small central portion 21 and relatively large ends 23 .

FIG. 3A shows the creation of angled fins by cutting material, thereby forming a monoblock finned tube with a square pattern at the transition points of the thickness of the tube material.

FIG. 3B illustrates the creation of angled fins by cutting material, thereby forming a monoblock finned tube with an angled pattern at the transition points in the thickness of the tube material.

FIG. 3C shows the creation of angled fins by cutting material, thereby forming a monoblock finned tube with a circular pattern at the transition points of the thickness of the tube material.

FIG. 4 shows a tube extrusion with a single port. A solid extrudate block 40 cut from a continuous extrudate has a single central port or channel 41 , sloped sidewalls 43 and laterally extending connecting sidewalls 45 .

FIG. 5 shows the extrusion of the tube shown in FIG. 4 after cutting the material to form the vertical fins. A portion 47 extending across the extrusion is removed, leaving vertical fins 49 extending across the resulting tube 50 . Tube 50 has large ends 33 around a small center 51 .

FIG. 6 shows the extrusion after cutting the material to form the angled fins. Material is removed from portion 67 of solid extrusion 40 leaving fins 69 at an angle to the dimensions of resulting tube 70 .

FIG. 7 shows a horizontal arrangement of tubes using flat vertical header plates. The tube 50 is connected at its large end 53 to a vertical mounting plate 80 which is connected to the header tank, vessel, shell and lid to form a header chamber (not shown).

FIG. 8 shows a vertical arrangement of tubes using flat horizontal header plates. The vertically oriented tube 50 is connected at its large end 53 to a horizontal mounting plate 82 which is connected to the header chamber.

FIG. 9 shows a circular arrangement of tubes using a flat circular header plate. A vertically oriented tube 50 is connected at its large ends 53 to upper and lower annular mounting plates 84 which are connected to the header chambers.

FIG. 10 shows a curved tube of tubes arranged in a circle. A vertically oriented curved tube 90 has a thin curved tube central section 91 and a thick curved end section 93 . Curved openings 97 appear in the upper and lower annular mounting plates 95 .

FIG. 11 shows a curved, twisted, angled, helically arranged tube with slanted ends. The twisted and canted helical tube 100 has a large end 103 with a similar shape. A small central portion 101 of tube 100 has the continuous curved, twisted, tilted, and helical shape of the rest of tube 100 . Outer header ring 105 is flat for connection to the header receptacle.

FIG. 12 shows the joining of adjacent tube ends by friction stir welding or hybrid friction diffusion welding. Large ends 53 of tubes 50 are joined 110 together by friction stir welding (FWS) or hybrid friction diffusion bonding (HFDB) 112 .

FIG. 13 shows the machining of the protrusions on the tube ends. Material 121 is removed from end 125 of large end 53 of tube 50 being joined 110 , leaving protrusion 127 .

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

FIG. 15 shows tube ends with protrusions joined together.

Flat plate 130 has openings 137 for receiving and retaining projections 127 from ends 125 .

FIG. 16 shows a tube end with protrusions friction welded to the plate. The ends 129 of the protrusions are friction welded 139 to the edges of the openings 137 in the flat plate. Welding is performed on the side 131 of the flat plate facing the chamber.

FIG. 17A shows a single helical tube that is curved, twisted, and tilted. Tube 100 is aligned, a portion of end 103 is removed, and end 107 is angled with respect to the tube and aligned parallel in both end plates.

In FIG. 17B, each curved, twisted, and tilted helical shaped tube 100 has an enlarged end 103 and fins 101 . The enlarged ends will be cut or machined to flatten them horizontally.

FIG. 18 shows a flattened angled end bond. The aligned angled end faces 109 of the wide ends 103 of the tubes 101 are friction welded 140 so that the entire cylinder of welded tube ends 103 are joined together.

Figures 19A, 19B show the machining of the joined flat ends. A portion of material 141 is removed from the ends welded together to provide protrusions 145 as shown in these two figures. The angled removal of a portion of the end and the protrusion surrounding the tube channel opening provides a large communication opening 146 that reduces the refrigerant pressure drop.

Figures 20A and 20B show a ring with openings for receiving protrusions. Flat ring 150 has openings 155 for receiving protrusions 145 .

Figures 21A and 21B show the joining of the end projections with the ring by friction welding. The inner edge 157 of the opening 155 and the end edge 147 of the projection 145 are friction welded 159 on the container side 151 of the connecting flat ring 150 .

22-27 show joining the tube and header connector plate by brazing as compared to fusion welding in FIG.

FIG. 22 shows a tube with enlarged ends. Tube 200 is formed with large ends 203 and a relatively thin central section 201 . Fins can be formed in the central region by removing material from the extruded tube.

FIG. 23 shows the machining of protrusions on the tube ends for brazing. Sections 204 are removed from the ends leaving protrusions 205 extending from surface 207 .

FIG. 24 shows a flat plate for receiving the machined ends.

FIG. 25 shows the brazing of the plate and the tube into the plate.

Header connector plate 210 has openings 215 for receiving protrusions 205 on large ends 203 of tubes 200 .

FIG. 26 shows brazing the ends of the ring after inserting the protrusion into the ring. Projection 205 extends beyond header receptacle side 211 of the header connector plate. The braze is continuous between surface 207 , protrusion 205 , complementary outer surface 217 and the surface of opening 215 .

FIG. 27 shows a brazed assembly for comparison with fusion welding.

FIG. 28 shows fusion welding for comparison with brazing.

Protrusions 209 of protrusions 205 shown in Figures 26 and 27 are necessary to prevent filler material from migrating into the microports of the tube.

Friction stir welding (FSW) or hybrid friction diffusion bonding (HFDB) does not require extension of protrusion 225 beyond vessel side 231 of header connection plate 230 .

In one embodiment of the invention, the tube is formed without protrusions on the end faces. By removing material from the end face, the step of machining the end face to create the protrusion is eliminated.

FIG. 29A shows the planarization step of FIGS. 17A, 17B and 18. FIG. Tube 100 is aligned, a portion of end 103 is removed, and end 107 is angled with respect to the tube and aligned parallel in both end plates. Each twisted, tilted and helically curved tube 100 has an enlarged end 103 and fins 101 . The aligned angled end faces 109 of the wide ends 103 of the tubes 101 are friction welded 140 to join the full cylinders of the welded tube ends 103 together.

FIG. 29B illustrates such an embodiment with the shape of tube 300 curved, tilted, tilted and twisted in spiral tube cylindrical arrangement 350 as shown in FIGS. 11, 17A, 17B and 21B. indicated by . Header portion 333 is shown without machining and flattening.

FIG. 30 shows a machined inner peripheral edge 442 and a machined outer peripheral edge 444 . A weld area 440 is shown between machined peripheral areas 442 and 444 of a flattened header 446 .

31 with machined inner perimeter edges 450 and 451 and machined outer perimeter edges 452 and 454 and their corresponding top connecting end rings 462 and 464 and bottom connecting end rings 474 and 476. , shows the helical coil arrangement 600 of the tube 400 being curved, twisted, tilted, and tilted.

FIG. 32 shows end rings 462, 464, 474 and 476 attached to header portions 480 and 481 respectively, upper weld area 482 between adjacent upper tube headers 480, upper end rings 462 and 464 and upper Upper perimeter weld areas 484 and 486 between tube header 480 are shown. An outer region 478 is shown extending outwardly from the lower bonded header 481 .

Figures 33A and 33B show a welded solid state helical coil assembly 700 having top and/or bottom surfaces 500 and 502 that have been reworked and/or polished for further connection to a coil header tank or vessel, respectively.

The illustrative chart pages 1, 2, 3, 4, and 5 shown in FIGS. 34-38 illustrate the formation and joining of tube ends by clamping and flattening the headers and adjoining headers in regions spaced from the channels. The welding of, the machining of the header faces, the use of header end plates, and the polishing of the ends of the solid state robust structure are illustrated and labeled.

Although the invention has been described with reference to particular embodiments, modifications and variations of the invention can be constructed without departing from the scope of the invention as defined in the following claims. The technology disclosed in this specification is shown in the following items.
(Item 1)
a relatively thin central portion;
a relatively thick header portion at the end of the relatively thin central portion;
fins extending outwardly from the central portion;
an end face of an end of the header portion remote from the central portion;
at least one channel extending through the tube;
A device comprising heat exchanger tubes having
(Item 2)
The device of item 1, further comprising a gradual transition between said relatively thin central portion and said relatively thick header portion.
(Item 3)
said heat exchanger tubes being extruded with a thickness of said header portion and said at least one channel extending through said tubes;
2. The apparatus of item 1, wherein material is removed from the sides of the tube at spaced apart areas of the central portion, leaving fins.
(Item 4)
2. The device of item 1, wherein the tube is longitudinally curved.
(Item 5)
The device of item 1, wherein the tube is tilted, twisted and tilted.
(Item 6)
6. Apparatus according to item 5, wherein the fins are angled with respect to the longitudinal direction of the tube.
(Item 7)
further comprising a plurality of tubes positioned adjacent to each other with a tight press fit between the header portions of the tubes;
2. The apparatus of item 1, wherein the ends of the header portions are flattened by cutting or machining away the ends of the header portions and the flattened ends are joined.
(Item 8)
8. Apparatus according to item 7, wherein a header ring is disposed in intimate contact with the inner and outer peripheries of the flattened end and is joined to the flattened end by friction stir welding.
(Item 9)
9. The apparatus of item 8, wherein the ends of the header portion are joined by friction welding away from the area surrounding the opening of the at least one channel at the end of the header portion.
(Item 10)
The apparatus of item 1, wherein the flattened bonded ends of the header portion of the tube and the header ring are polished and ready for use as a heat exchanger.
(Item 11)
further comprising a plurality of tubes positioned adjacent to each other with a tight press fit between the header portions of the tubes;
said end of said tube being flattened by machining or cutting, said flattened end projection of said end being further machined around said projection of said end of said tube; 7. Apparatus according to item 6, wherein a continuous flat end surface is formed.
(Item 12)
12. Apparatus according to item 11, further comprising a face plate having an opening for receiving said protrusion joined to said flat end surface by welding.
(Item 13)
the protrusion extends through the opening in the face plate;
13. The apparatus of item 12, wherein the face plate opening and the protrusion are sealed by brazing.
(Item 14)
extruding a relatively thick flat tube having at least one relatively thin channel extending through the tube;
machining or ablating spaced apart areas in the central portion;
By leaving a relatively thin central portion with spaced-apart fins extending across the tube and a relatively thick header portion at the end of the tube and having the opening of the channel at the end of the header portion. , a method comprising forming a heat exchange tube.
(Item 15)
Placing multiple tubes close to each other,
pressing the header portions together with a tight press fit between the header portions;
15. The method of item 14, further comprising holding said header portions together.
(Item 16)
16. The method of item 15, further comprising curving the tube first.
(Item 17)
first forming the fins at an angle to the tube;
bending, tilting, tilting, and twisting the tube before pressing the header portions together;
flattening the ends of the tube by cutting or machining the ends of the tube;
placing a ring tightly around the flattened end of the tube;
joining the ring and the flattened end by friction welding;
joining adjacent ends of the tube by friction welding;
16. The method of item 15, further comprising grinding the joined end of the tube and the joined end face of the ring, leaving an area around the channel free of the weld.
(Item 18)
first forming the fins at an angle to the tube;
bending, tilting, tilting, and twisting the tube before pressing the header portions together;
flattening the ends of the tube into a single flat surface by cutting or machining the ends of the tube;
further machining the end of the tube to leave a projection of the tubing material formed around the opening of the channel in the tube end and an end face of the header portion around the projection; leaving
providing an end plate having an opening for receiving the protrusion;
placing the end plate on the end face;
16. The method of item 15, further comprising friction welding the end plate to the end face.
(Item 19)
19. The method of item 18, further comprising friction welding the opening in the end plate to the side of the protrusion.
(Item 20)
extending the protrusion through the opening in the end plate;
19. The method of item 18, further comprising brazing the protrusion to the opening in the end plate.
(Item 21)
1. An apparatus comprising a heat exchanger having a plurality of identical monoblock coils formed from extruded flat tubes with channels,
removing opposing spaced apart side sections from the central section, leaving angled fins in a relatively thin central section and relatively thick header sections at the ends of said tubes;
said tube having a tilted, tilted and twisted center section and an aligned header section;
said header sections being pressed together with a machined flat end face and a close fit;
A device joined by a weld between adjacent end faces, wherein the welded area is spaced from the area surrounding the tube and the end faces are polished.

Claims (16)

a central part;
a header portion at the end of the central portion and thicker than the central portion;
fins extending outwardly from the central portion;
an end face of an end of the header portion remote from the central portion;
a plurality of tubes positioned adjacent to each other between the header portions;
at least one channel extending through the tube;
a heat exchanger tube having
said heat exchanger tubes being extruded with a thickness of said header portion and said at least one channel extending through said tubes;
material of the central portion is removed from the sides of the tube at intervals, leaving fins at intervals on the central portion ;
A device wherein the ends of the header portions are flattened by cutting or machining away the ends of the header portions and the flattened ends are joined . a central part;
a header portion at the end of the central portion and thicker than the central portion;
fins extending outwardly from the central portion;
an end face of an end of the header portion remote from the central portion;
at least one channel extending through the tube;
a heat exchanger tube having
said heat exchanger tubes being extruded with a thickness of said header portion and said at least one channel extending through said tubes;
material of the central portion is removed from the sides of the tube at intervals, leaving fins at intervals on the central portion ;
A device wherein the flattened and joined ends of the header portion of the tube and the ring-shaped header plate are polished and ready for use as a heat exchanger . 3. The device of claim 1 or 2 , further comprising a gradual transition portion between said central portion and said header portion. 3. The device of claim 1 or 2 , wherein the tube is longitudinally curved. 3. A device according to claim 1 or 2 , wherein the tube is longitudinally slanted, transversely twisted and slanted with respect to the end face of the device. 6. The device of claim 5 , wherein the fins are angled with respect to the longitudinal direction of the tube. 7. A ring-shaped header plate is arranged in intimate contact with the outer peripheral surface of the flattened end and is joined with the flattened end by friction welding . The apparatus described in . 8. The apparatus of claim 7, wherein the ends of the header portion are joined by friction welding away from the area surrounding the opening of the at least one channel at the end of the header portion. further comprising a plurality of tubes positioned adjacent each other between the header portions of the tubes;
3. The apparatus of claim 2 , wherein the ends of the tube are flattened by machining or cutting to form a continuous flat end surface on the ends of the tube. 10. The apparatus of claim 9 , further comprising a header plate having openings for receiving protrusions joined to said flat end face by welding. the protrusion extends through the opening in the header plate;
11. The apparatus of claim 10 , wherein the header plate opening and the protrusion are sealed by brazing. extruding a flat tube having at least one channel extending through the tube;
machining or ablating the material of the central portion of said tube at intervals ;
leaving a central portion in which a plurality of fins are spaced from each other and extending across the tube, and a header portion existing at the ends of the tube and thicker than the central portion; forming heat exchange tubes by having channel openings;
first forming the fins at an angle to the tube;
bending and twisting the tube and pressing the header portions together;
flattening the ends of the tube by cutting or machining the ends of the tube;
placing a ring-shaped header plate tightly around the flattened end of the tube;
joining the header plate and the flattened end by friction welding;
joining adjacent ends of the tube by friction welding;
Grinding the joined end of the tube and the joined end face of the header plate, leaving an area around the channel free of the weld . The ends of the tube are further machined to leave a projection of the material of the tube around the opening of the channel at the end of the tube and the header portion around the projection. leaving the end face of
providing a header plate for receiving said protrusion;
placing the header plate on the end face;
13. The method of claim 12 , further comprising friction welding the header plate to the end face. 14. The method of claim 13 , further comprising friction welding openings in the header plate to sides of the protrusions. extending the protrusion through an opening in the header plate;
14. The method of claim 13 , further comprising brazing the protrusion to the opening in the header plate. 1. An apparatus comprising a heat exchanger having a plurality of identical heat exchange tubes formed from extruded flat tubes with channels,
material of the flat tube is removed from the central section, leaving angled fins in the central section and a header section thicker than the central section at the ends of said tube;
said tube is longitudinally slanted, slanted with respect to the end face of the device, and twisted transversely, having an aligned central section and a header section;
said header section being pressed together with a machined flat end surface of said header section ;
An apparatus joined by a weld between the end faces of adjacent said header sections, wherein the welded area is spaced from the area surrounding the central section of said header section and the end faces are polished.

Images