KR102448720B1 - tube joining - Google Patents

Abstract

The coupling of thin heat exchanger tubes to manifold header tanks is improved by extruding thick tubes with channels or microchannels. The tubing material is removed from the spaced-apart region of the central portion, leaving a finned thin heat exchanger central portion and a thicker header portion. The tube is curved, twisted and tilted. The tubes are aligned horizontally, vertically or at an angle, and the header parts are welded together. Tube material is removed from the end of the header portion to form an end face extending from the end face and having a projection surrounding the channel or microchannel. An end plate having an opening for receiving the protrusion is attached and sealed to the protrusion and the end face by welding or brazing. The face plate is attached and sealed to the opening of the header tank by welding or brazing. The tube end is flattened. rings are added. The ends and rings are friction welded to avoid the perimeter of the channel opening and polished.

Description

tube joining

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

There are major problems with heat exchangers and air conditioning systems. A finned heat transfer tube has many connections. Connecting the pins to the tube is a problem. Connecting the tube end to the header tank is a more serious problem. When the connection is broken, a leak occurs that drains the internal fluid and dies the heat exchangers used in air conditioning, heat, power and refrigeration systems. Vibration and bimetal cell corrosion break the connection.

The end of the heat exchanger tube is connected to the opening of the header tank at the end of the tube. Connecting the tube to the header tank by friction welding is not a solution because the relatively thin tube end is deformed. The friction temperatures required to weld and weld the tube end and the fuse distort and destroy the tube end and the port/channel.

There is a need for a solution to the problem of heat exchanger leakage and tube-to-header coupling in heat exchangers.

contained within the text.

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

The present invention provides a tube having a relatively thin central section to facilitate heat exchange and a large, thick end section for coupling to a header. The large end of the tube is machined flat. The material is removed at the flat end, leaving a protrusion with the material surrounding the channel on the tube.

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

When the tube end and protrusion are welded to the header faceplate, the tube end is flush with and welded to the header plate opening on the header side of the faceplate. The tube end and edge of the large flat tube end are friction welded to the header face plate. The cross edges of the header face plate and the header body are friction welded to each other.

The important features of the new invention are as follows.

열 교환 튜브의 큰 단부

large end of heat exchange tube

튜브 재료 두께 전이 지점에서 튜브의 두꺼운 부분에서 얇은 부분으로 또는 그 반대로 갈 때 각도 또는 원형 패턴,

An angular or circular pattern when going from the thick to the thin part of the tube at the tube material thickness transition point and vice versa;

큰 단부를 열 교환기 페이스 플레이트에 결합, 및/또는

coupling the large end to the heat exchanger face plate, and/or

열 교환기 튜브의 큰 단부를 서로 연결,

connecting the large ends of the heat exchanger tubes to each other,

열 교환기 튜브의 확대된 단부의 단부 표면 평탄화,

flattening the end surface of the enlarged end of the heat exchanger tube;

열 교환기 튜브의 평평한 단부에서 재료를 제거하여 튜브 내의 내부 채널을 둘러싸는 돌출부를 형성,

removing material from the flat end of the heat exchanger tube to form a protrusion surrounding the inner channel within the tube;

돌출부를 열 교환기 헤더 커넥터 페이스 플레이트의 개구부에 삽입,

Insert the protrusion into the opening of the heat exchanger header connector faceplate;

열 교환기 튜브의 돌출부와 평평한 표면을 열 교환기 헤더 페이스 플레이트에 결합,

joining the protrusions and flat surfaces of the heat exchanger tube to the heat exchanger header faceplate;

열 교환기 헤더 페이스 플레이트의 대응하는 에지에 대한 돌출부의 에지 및 큰 단부의 에지를 마찰 용접,

friction welding the edge of the protrusion to the corresponding edge of the heat exchanger header faceplate and the edge of the large end;

브레이징 할 때, 페이스 플레이트를 통해 그리고 돌출부를 넘어 돌출부를 연장하고 돌출부의 표면 및 튜브의 편평한 큰 단부의 표면을 열 교환기 면 플레이트에 브레이징,

When brazing, extending the protrusion through and beyond the face plate and brazing the surface of the protrusion and the surface of the flat large end of the tube to the heat exchanger face plate;

모든 확대된 단부를 고정된 패턴으로 결합,

joining all enlarged ends in a fixed pattern;

고정 패턴은 원형.

The fixed pattern is circular.

The present invention provides a tube having one or more channels and having a long, thin central heat exchange portion and a shorter terminal header portion. The terminal header portion is thicker than the thin central heat exchange portion. There is an angular or circular pattern at the tube material thickness transition points. The end face of the terminal portion is machined or beveled to provide an outward projection extending around the one or more channels and protecting the one or more channels. The outer protrusion extends from the smooth, flat end face of the thick terminal header portion.

The end plate has an interior opening for receiving the outwardly protrusion. The end plate has an inner surface that is attached and sealed against an end face of the terminal header portion. The inner opening of the end plate is attached and sealed to the outward projection of the end surface of the terminal portion.

In one embodiment, the end plate and the outward projection co-extensive from the end face of the tube. The end plate is welded to the end face of the terminal header portion and to the outer protrusion of the end face.

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 the brazing material from migrating into the tube channel.

The tube is extruded and opposing surfaces of the middle portion of the tube are machined or ablated to remove sections of tube material and integrally form spaced fins on the middle portion of the thin fins. The fins are inclined with respect to the longitudinal direction of the middle 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. The material is removed from the middle portion of the tube and spaced fins are left in the thin middle portion. A thick terminal header portion is left at the ends of the plurality of tubes having an angular or circular pattern at the tube material thickness transition point. The plurality of tubes are horizontally or vertically aligned or bent, twisted and inclined in a helical relationship parallel to the twisted and inclined tubes. Terminal header portions of the plurality of tubes are aligned and joined by welding prior to machining or cutting ends of the plurality of joined terminal header portions to create a plurality of end faces and a plurality of outwardly protrusions on the plurality of end faces. A plurality of outwardly directed projections extend around and protect the channel. A plurality of outwardly directed projections are coupled to a flat end plate or inner and outer ring. The end plate has a plurality of inner openings for receiving a plurality of outwardly protrusions on a plurality of end faces of the joined terminal header portions. The plurality of interior openings of the end plate are welded or otherwise coupled to the plurality of outwardly directed projections. The end plate is welded or otherwise coupled to the plurality of end faces.

The new method comprises extruding a wide, thick tube with channels in the tube, followed by machining or cutting a central portion of the tube, removing the spaced-apart material from the central portion, thinning the central portion, the tube forming a fin across and leaving a thicker terminal header portion at the end of the tube, having an angular or circular pattern at the tube material thickness transition points, arranging the tubes parallel to each other, and the terminal portions of adjacent tubes welding or otherwise joining.

The machined or folded end of the joined terminal header portion defines an end face having an outwardly protruding portion extending around the channel and protecting the channel.

providing an end plate having an opening for receiving an outwardly directed protrusion, welding or otherwise coupling the end plate to the end face and to the protrusion prepares the end plate to be joined to the header tank at the end of the tube; or and providing an outer perimeter ring, and welding or otherwise coupling the inner and outer perimeter rings, prepares the ring to be joined to the header tank at the end of the tube.

Prepare the end plate for welding to the end face and the protrusion by friction stir welding or hybrid friction diffusion welding even when extending the protrusion outward through the thickness of the end plate.

Extending the outward projection through and through the end plate prepares the end plate and the brazing projection. The end plate may be brazed or welded to the end face.

The first improvement is to couple the thin heat exchanger tubes to the manifold header tanks by extruding thick tubes with channels or microchannels. The tubing material is removed in spaced-apart areas of the central portion, leaving fins in the thin heat exchanger central portion and the thick terminal header portion. The fin central part of the tube is bent, inclined, tilted and twisted. The tubes are aligned horizontally, vertically or at an angle, and the terminal header parts are welded together. Tube material may be removed from the end of the header portion to form an end face having a projection extending from the end face and surrounding the channel or microchannel. An end plate having an opening for receiving the protrusion is attached and sealed to the protrusion and the end face by welding or brazing. The face plate is attached and sealed to the opening of the header tank by welding or brazing, solving the problem of thin heat exchanger tubes coupled to the manifold header tank.

The tube has one or more channels extending through the tube and has an extended central portion and a shorter header portion. The header part is thicker than the central part. In one embodiment, the end face of the header portion has an outwardly protrusion extending around the one or more channels. The outward projection extends outwardly from the end face of the thick terminal header portion. The one or more channels are one or more microchannels.

The end plate has an interior opening for receiving the outwardly protrusion. The end plate has an inner face attached opposite the end face of the header portion. The inner opening of the end plate is attached to the outward projection of the end surface of the terminal portion.

In some embodiments, the end plate and the outer protrusion extend collinearly from an end face of the tube, and the end plate is welded to the end face and the outer protrusion on the end face of the header portion. The end plate and the outward projection are ball inflatable 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.

The tube is extruded and opposing parallel surfaces of the middle portion of the tube are machined to remove the material of the tube and to integrally form spaced fins on the middle portion. In some embodiments, the fins are inclined with respect to the longitudinal direction of the middle portion of the tube.

A plurality of similar extruded tubes have channels within the tube, and material is removed from the intermediate portion and the spaced fins from the spaced fins remaining in the middle portions of the plurality of similar tubes and the thick header portions remaining at the ends of the plurality of tubes. The header portion of the tube is aligned and welded or otherwise joined together prior to machining the ends of the plurality of joined header portions of the tube and creating a plurality of end faces and a plurality of outward projections on the plurality of end faces. A plurality of outwardly directed projections extend around the channel of the tube. The end plate has a plurality of interior openings for receiving a plurality of outwardly protrusions on the end faces of the joined header portions. The plurality of inner openings of the end plate are welded, brazed, or otherwise joined to the plurality of outwardly directed projections, and the end plate is welded or otherwise joined to the plurality of end faces.

The plurality of tubes are arranged horizontally, vertically or in curved, inclined, torsional and inclined parallel helical relationships.

The tube is curved, at least partially twisted and angled, at least partially wound and twisted, and configured to form at least a portion of a helical structure in a generally cylindrical structure having a cylindrical shape. The fin is curved, at least partially twisted and angled, at least partially wound and twisted, and configured to form at least a portion of the helical structure in a generally cylindrical structure having a cylindrical shape.

In some embodiments, the tube has a curved middle section and an end section, wherein the fin on at least one side of the tube is formed slightly concave with a central portion of the fin offset inwardly from the outer portion of the fin. The fins on the other side of the tube are slightly convex with the central section of the fin offset outwardly from the outer section of the fin.

The present invention provides a method of forming a fin across the tube by extruding a wide, thick tube having channels in the tube and machining the central portion of the tube, thereby removing material in sections spaced from the central portion. The method provides a thinner central portion of the fin, leaving a header portion at the end of the tube, with an angular or circular pattern at the tube material thickness transition points. The tubes are arranged parallel to each other and connected at the thicker portions of adjacent tubes. The machined end of the joined terminal header portion forms an end face. Some cross-sections have an outer protrusion that extends around the channel. Some end plates have openings for receiving outwardly directed projections. The end plate is then coupled to the end face and in some embodiments coupled to the protrusion.

When extending the outward projection through and even into the thickness of the end plate, the joining of the end face to the end plate is by friction stir welding or hybrid friction diffusion welding, if any.

The outwardly protrusion extends through and beyond the end plate by brazing coupling the end plate to the protrusion. The joining of the end plate and the end face is by welding.

In one form, the method of the present invention forms a thinner central portion with a fin and then longitudinally bends the tube, bends the thinner bent tubular center portion and bends the thicker bent tubular end portion. The protrusion from the end face is curved and the curved opening of the end plate receives the curved protrusion. The end plate is welded to the end face and welding or brazing joins the end plate to the protrusion.

In another form, the method of the present invention forms a thinner central portion with a fin and then bends the tube longitudinally, bends the thinner bent tubular center portion and bends the thicker bent tubular end portion. The protrusion from the end face is curved and the curved inner and outer rings receive the curved protrusion. 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 protrusions.

These and further and other objects and features of the present invention are apparent from the disclosure, including the above and pending written specification in conjunction with the claims and drawings.

contained within the text.

1 shows tube extrusion using microchannels.
Figure 2 shows cutting the material to make a vertical pin.
3A shows the formation of a monoblock fin tube having a square pattern at the tube material thickness transition points by manufacturing an angle fin by cutting the material.
Figure 3b shows the formation of a monoblock fin tube with an angled pattern at the tube material thickness transition points by making the angle fins by cutting the material.
Figure 3c shows the formation of a monoblock fin tube having a circular pattern at the tube material thickness transition points by making an angled fin by cutting the material.
4 shows the extrusion of a tube with a single port.
Fig. 5 shows the extrusion of the tube shown in Fig. 4 after cutting the material and forming the vertical fins.
6 shows the extrusion after cutting the material to form an angled fin.
7 shows the horizontal arrangement of tubes between flat vertical header connector plates.
8 shows the vertical arrangement of tubes between flat horizontal header connector plates.
9 shows a cylindrical arrangement of tubes between flat, flat annular header plates.
10 shows a curved tube arranged in a cylindrical shape.
11 shows a curved, twisted, inclined, helical arrangement tube with beveled ends.
12 shows joining adjacent tube ends by friction stir welding or hybrid friction diffusion bonding.
13 shows a machined projection of the tube ends.
14 shows a flat header connector plate having an opening for receiving a tube end protrusion.
15 shows the joined tube end with a protrusion.
16 shows the tube end friction welded to the plate.
17A and 17B show the flattened end angled with respect to the tube bevel.
18 shows joining the flattened angled ends.
19A and 19B show machining of joined flat ends to form protrusions.
20A and 20B show a flat ring plate having an opening for receiving a protrusion.
21a and 21b show joining the end protrusions in a flat ring plate by friction welding.
22 shows a tube with a large end.
23 shows machining the protrusion on the end of the tube for brazing.
24 shows a flat header connector plate for receiving an end machined with a protrusion.
25 shows a tube with large ends and protrusions that can be mounted to a header connector plate.
26 shows the brazing and end of the plate after inserting the protrusion through the plate.
27 shows a brazing assembly comparable to fusion welding.
Fig. 28 shows the fusion welding compared to the brazing of Figs. 26 and 27;
29A shows the planarization steps of FIGS. 17A, 17B and 18 .
29B shows an embodiment in the form of curved, beveled, inclined and twisted tubes in a helical cylindrical arrangement of many tubes without machining.
30 shows the inner and outer machined peripheral sections of the tube end already welded.
31 shows a helical coil assembly with top and bottom machined to connect the corresponding rings.
32 shows the header portion and the end ring attached to the weld area.
33A and 33B show upper and lower solid coil polished flat surfaces for further attachment to a header tank or vessel.

1 shows tube extrusion using microchannels. The solid extrudate 10 has a beveled side 13 with a number of through ports or channels 11 and a side connecting wall 15 .

Figure 2 shows cutting the material to make a vertical film. The material portion 17 has been removed to leave a vertical portion pin 19 . The final tube 20 has a relatively small middle portion 21 and a larger end 23 .

Figure 3a shows the formation of a monoblock fin tube having a rectangular pattern at the tube material thickness transition points by manufacturing an angled fin by cutting the material.

Figure 3b shows the formation of monoblock fin tubes with an angled pattern at tube material thickness transition points by making angled fins by cutting the material.

3C shows the formation of a monoblock fin tube with a circular pattern at the tube material thickness transition points by manufacturing an angle fin by cutting the material.

4 shows the extrusion of a tube with a single port. A solid extrusion block 40 cut from continuous extrusion has a single central port or channel 41 , a beveled sidewall 43 and a side extending sidewall 45 .

Fig. 5 shows the extrusion of the tube shown in Fig. 4 after cutting the material and forming the vertical fins. The portion 47 that extends across the extrusion is removed leaving a vertical fin 49 that extends across the resulting tube 50 . The tube 50 has a large end 33 around a smaller intermediate portion 51 .

6 shows the extrusion after cutting the material to form an angled fin. Material was removed from portion 67 of solid extrudate 40 to leave fins 69 at an angle with the dimensions of resulting tube 70 .

Figure 7 shows the horizontal arrangement of tubes with a flat vertical header plate. The tube 50 has a large end 53 connected to a vertical mounting plate 80, which connects to the header tank, vessel, shell and lid to create a header chamber (not shown).

Figure 8 shows the vertical arrangement of tubes with a flat horizontal header plate. The vertically arranged tube 50 has a large end 53 connected to a horizontal mounting plate 82 connected to the header chamber.

9 shows the arrangement of tubes in a circle with a flat circular header plate. The vertically arranged tube 50 has a large end 53 connected to an upper and lower annular mounting plate 84 connected to the header chamber.

10 shows curved tubes arranged in a circle. The vertically arranged curved tube 90 has a thinner curved tubular central section 91 and a thicker curved end section 93 . Curved openings 97 appear in the upper and lower annular mounting plates 95 .

11 shows a curved, twisted, beveled, helical array tube with beveled ends. The twisted, inclined helical tube 100 has a larger end 103 of similar shape. The outer header ring 105 is flat for connection to the header container.

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

13 shows the machined protrusion of the tube end. Material 121 is removed from end 125 of large end 53 of joined tube 50 to leave protrusion 127 .

14 shows a flat plate with openings for tube end protrusions.

15 shows the joined tube end with a protrusion.

The flat plate 130 has an opening 137 for receiving and retaining the protrusion 127 from the end 125 .

16 shows a tube end with a projection welded to the plate by friction. The end 129 of the protrusion is friction welded 139 to the edge of the opening 137 in the flat plate. Welding is performed on the chamber-side 131 of the flat plate.

17A shows a single curved, twisted, inclined and helical shaped tube. The tube 100 is aligned and a portion of the end 103 is removed so that the end 107 is angled relative to the tube and aligned parallel to the opposite end plate.

In FIG. 17B , each curved, twisted, inclined and spirally formed tube 100 has an enlarged end 103 and a fin 101 . The enlarged end must be cut or machined to level it horizontally.

18 shows joining the flattened angled ends. The aligned angled end face 109 of the wide end 103 of the tube 101 is friction welded 140 to join the complete cylinders of the welded tube end 103 together.

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

20A and 20B show a ring having an opening for receiving a protrusion. The flat ring 150 has an opening 155 for receiving the protrusion 145 .

21A and 21B show joining the end protrusions in the ring by friction welding. The inner edge 157 of the opening 155 and the end edge 147 of the protrusion 145 are friction welded 159 on the vessel side 151 connecting the flat ring 150 .

22-27 show the joining of the tube and header connector plate by brazing compared to the melt welding of FIG. 28;

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

23 shows machining the protrusion on the end of the tube for brazing. Section 204 is removed from the end to leave projections 205 extending from surface 207 .

24 shows a flat plate for receiving the machined end.

25 shows the brazed tube on and in the plate.

The header connector plate 210 has an opening 215 for receiving a protrusion 205 at the large end 203 of the tube 200 .

Figure 26 shows the brazing and end of the ring after inserting the projection into the ring. The projection 205 extends beyond the header container side 211 of the header connector plate. The brazing is continuous between the surface of the surface 207 , the protrusion 205 , the complementary outer surface 217 and the surface of the opening 215 .

27 shows a brazing assembly for comparison with fusion welding.

28 shows fusion welding for comparison with brazing.

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

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

In one embodiment of the invention, the tube is made without protrusions on the end face. Machining the end face to create the protrusion by removing material from the end face is avoided.

29A shows the planarization steps of FIGS. 17A, 17B and 18 . The tube 100 is aligned and a portion of the end 103 is removed so that the end 107 is angled relative to the tube and aligned parallel to the opposite end plate. Each twisted, beveled and helically curved tube 100 has an enlarged end 103 and a fin 101 . The aligned angled end face 109 of the wide end 103 of the tube 101 is friction welded 140 to join the complete cylinders of the welded tube end 103 together.

29B shows this embodiment in the form of curved, inclined, inclined and twisted tube 300 in a spiral tube cylindrical arrangement 350 as shown in FIGS. 11 , 17A, 17B and 21B . Header portion 333 is shown without machining and flattening.

30 shows a machined inner perimeter 442 and a machined outer perimeter 444 . A welded region 440 is shown between the machined perimeter regions 442 and 444 of the planarized header 446 .

Figure 31 shows a curved, twisted shape with machined inner perimeters 450 and 451, machined outer perimeters 452 and 454 and corresponding upper connecting end rings 462 and 462 and lower connecting end rings 474 and 476; , showing a helical coil arrangement 600 of inclined, inclined tube 400 .

32 shows end rings 462, 464, 474, and 476 attached adjacent header portions 480 and 481, upper weld area 482 between adjacent upper tube headers 480, and upper end rings 462 and 464. ) and the upper perimeter weld area 480 , 486 between the upper tube header 480 . The outer region 478 is shown extending outwardly from the lower mating header 481 .

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

The storytelling chart pages 1, 2, 3 and 4 on pages 18-22 then follow the steps for clamping and flattening the header, welding adjacent headers in areas spaced from the channel, machining the header face, and the header end. The use of a plate and the polished end of the solid state rigid structure is disclosed by way of example and label.

Although the invention has been described with reference to specific embodiments, modifications and variations of the invention may be made without departing from the scope of the invention as defined in the following claims.

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Claims (21)

a heat exchanger tube,
The heat exchanger tube,
central part,
header portions on the ends of the central portion and thicker than the central portion;
pins extending outwardly from the central portion;
end faces on the ends of the header portions away from the central portion, and
at least one channel extending through the tube;
the heat exchanger tube is extruded to the thickness of the header portions and formed into at least one channel extending through the tube;
In spaced sections of the central portion material is removed from the sides of the tube and the fins remain. The method of claim 1,
and progressive transition portions between the central portion and the header portions. delete The method of claim 1,
The tube is bent in the longitudinal direction. The method of claim 1,
wherein the ends of the tube are inclined, and the tube is twisted and spirally inclined. 6. The method of claim 5,
wherein the fins are angled with respect to the longitudinal direction of the tube. The method of claim 1,
It further comprises a plurality of tubes, wherein the plurality of tubes are arranged adjacent to each other by being pressed and pressed between the header portions of the tubes, the ends of the header portions being flattened by cutting or machining the ends of the header portions, and , the device in which the flattened ends are joined. 8. The method of claim 7,
Header rings are disposed in close contact with the inner circumferential surface and the outer circumferential surface of the flattened ends and joined with the flattened ends by friction stir welding. 9. The method of claim 8,
The ends of the header portions are joined by friction welding away from areas surrounding the openings of the at least one channel at the ends of the header portions. 9. The method of claim 8,
The joined flattened ends of the header portions of the tubes and the header rings are polished and prepared for use as a heat exchanger. 7. The method of claim 6,
further comprising a plurality of tubes, wherein the tubes are arranged adjacent to each other by being pressed and press-fitted between the header portions of the tubes, the ends of the tubes by machining or cutting and by further processing of the flattened end projections of the ends. An apparatus planarized by machining, wherein continuous flat end face surfaces are formed around the projections on the ends of the tubes. 12. The method of claim 11,
and face plates having openings to receive the protrusions joined to the flat end faces by welding. 13. The method of claim 12,
wherein said projections extend through and beyond said openings in said face plates, said openings and said projections in said face plates being sealed by brazing. forming heat exchanger tubes by extruding the flat tubes extending through the tubes and having at least one channel thicker than the flat tubes;
machining or ablating the spaced apart sections in the central portions, and
leaving central portions and header portions thicker than the central portions of the tubes having openings in the channels at the ends of the central portions and the header portions with spaced fins extending across the tubes. leaving the header portions at the ends
including,
The heat exchanger tubes are extruded to the thickness of the header portions and formed into at least one channel extending through the tube, material is removed from the sides of the tube in spaced sections of the central portion and the fins are how to stay. 15. The method of claim 14,
arranging a plurality of tubes close to each other and pressing the header portions to be tightly pressed and pressed between the header portions, and
holding the header parts together
How to include more. 16. The method of claim 15,
and arranging the plurality of tubes close to each other and bending the tubes prior to pressing the header portions. 15. The method of claim 14,
initially forming the fins at an angle to the plurality of tubes;
longitudinally bending the tubes and beveling the ends of the tubes and helically tilting and twisting the tubes before pressing the header portions together;
flattening the ends of the tubes by cutting or machining the ends of the tubes;
closely disposing rings around the flattened ends of the tubes;
joining the rings and the flattened ends by friction welding and joining adjacent ends of the tubes by friction welding;
leaving areas around the channels without welding, and
polishing the mated ends of the tubes and the mated end surfaces of the rings;
How to include more. 15. The method of claim 14,
initially forming the fins at an angle to the plurality of tubes;
longitudinally bending the tubes and beveling the ends of the tubes and helically tilting and twisting the tubes before pressing the header portions together;
flattening the ends of the tubes by cutting or machining the ends of the tubes against a single flat surface;
further machining the ends of the tubes to form and leave projections of tube material around the openings of the channels at the tube ends, leaving end faces of the header portions around the projections;
providing end plates having openings for receiving the protrusions; and
disposing the end plates on the end faces and friction welding the end plates to the end faces;
How to include more. 19. The method of claim 18,
friction welding the openings in the end plates to the sides of the protrusions. 19. The method of claim 18,
extending the protrusions through the openings in the end plates and brazing the protrusions to the openings in the end plates. heat exchanger tubes, wherein the heat exchanger tubes are formed of flat tubes extruded with channels, opposite and spaced apart side sections with respect to the central section on the central section and on header sections thicker than the central section leaving angled fins, the ends of the tubes beveled, the tubes spirally inclined and twisted, the tubes having central sections aligned, the tubes tightly pressed and pressed into machined flat end faces having header sections pressed together, the header sections being joined by welds between adjacent end faces, the welded areas being spaced apart from areas surrounding the tubes and the end surfaces being polished, the heat exchanger tubes being the header portion An apparatus extruded to a thickness of at least one channel extending through the tubes, wherein material is removed from the sides of the tube in spaced sections of the central portion, leaving the fins.

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