JP2005214511A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit the flowage of brazing material in brazing. <P>SOLUTION: This heat exchanger does not have a brazing material layer on an inner surface of a tube 5, but has brazing material layers 49b, 49c on both faces of an inner fin 49, and the tube 5 and the inner fin 49 are joined. The inner fin 49 is brazed and joined to an inner peripheral face of the tube 5 so that it is not kept into contact with both joint parts 47, 47. Whereby a brazing material flowage cut-off part S dividing the brazing material in the tube 5 (brazing material layers 49b, 49c of both faces of inner fin 49) and the brazing material outside of the tube 5 (brazing material layer 5c of outer surface of tube 5), is formed near joint parts 47, 47 of the inner surface of the tube 5. The brazing material flowage cut-off part S divides the flowage of the brazing material in the tube 5 and the flowage of the brazing material outside of the tube in brazing, and prevents flow-out of the brazing material from the inside of the tube 5 to the outside of the tube 5 and flow-out of the brazing material from the outside of the tube 5 into the tube, through the joined faces of the joint parts 47, 47. As a result, the flow-out of the brazing material to the outside of the tube 5 and the flow-out of the brazing material from the outside of the tube 5 into the tube 5 can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchanger.

  A conventional heat exchanger is disclosed in Patent Document 1. This heat exchanger is configured by communicating and connecting both end openings of flat tubes arranged in multiple stages to a pair of opposing header tanks. Wave-like outer fins are interposed between the tubes arranged in multiple stages. Moreover, a wavy inner fin is inserted in each tube.

  In the heat exchanger configured as described above, the refrigerant introduced into one header tank through the refrigerant inlet connector flows in the tube so as to meander between one header tank and the other header tank. Thus, the refrigerant is discharged through a refrigerant outlet connector fixed to any one of the header tanks. At this time, the refrigerant flowing in the heat exchanger is heat-exchanged with the air passing through the gap between the outer fins between the tubes. For example, when the heat exchanger is used as a radiator or condenser, the refrigerant flowing through the heat exchanger is cooled, and when used as an evaporator, the refrigerant flowing through the heat exchanger is heated. .

In the heat exchanger manufacturing method, the tubes and outer fins are alternately laminated, and the tubes are inserted into the tube insertion port of the header tank to form a temporary assembly, and the temporary assembly is set at a predetermined temperature in the furnace. After heating to melt the brazing material on the surface of the core material of each member, each member is integrally fixed by cooling to obtain a desired heat exchanger.
JP-A-10-227593

  Here, the tube may be formed into a cylindrical shape by bending and deforming one thin metal plate, or may be formed into a cylindrical shape by combining two thin metal plates in the middle. Each tube includes a joint between thin metal plates. In such a structure with a joint in the tube, the brazing material melted during brazing flows through the brazing material layer on the inner surface of the tube and the brazing material layer on the outer surface of the tube, and the inside and outside of the tube through the joining portion of the tube. Go in and out.

  At this time, due to the capillary phenomenon, the brazing material may be sucked out to the side where the total area of the joint surface is large inside and outside the tube, and the other brazing material may be deficient. In general, the total area of the joint surface in the tube (joint surface between the tube inner peripheral surface and the inner fin) is larger than the total area of the joint surface outside the tube (joint surface between the tube outer peripheral surface and the outer fin), Is big. Therefore, the brazing material tends to be insufficient on the joint surface outside the tube (joint surface between the tube outer peripheral surface and the outer fin).

  The present invention has been made on the basis of such a conventional technique, and the purpose thereof is that the brazing material melted during brazing flows from the inside of the tube to the outside of the tube or from the outside of the tube to the inside of the tube. Is to prevent this.

  Therefore, the present inventor has paid attention to the fact that the flow of the brazing material is suppressed in a portion not provided with the brazing material layer.

The invention of claim 1 is a heat exchanger comprising a tube as a heat transfer tube, an outer fin brazed to the outer surface of the tube, and an inner fin brazed to the tube. And
The tube is formed by bending a sheet of metal sheet having a brazing material layer only on one side of the core material into a cylindrical shape so that the brazing material layer is on the outer peripheral surface side, and then brazing the joints. It is what was joined
The inner fin is provided with a brazing material layer on both surfaces of a core material, and is brazed and joined to the inner peripheral surface of the tube so as not to contact the joining portion of the tube.

The invention of claim 2 is a heat exchanger comprising a tube as a heat transfer tube, an outer fin brazed to the outer surface of the tube, and an inner fin brazed to the tube. And
The tube is formed by combining a plurality of metal thin plates having a brazing material layer only on one surface of the core material into a cylindrical shape so that the brazing material layer is on the outer peripheral surface side, and then joining the joining portions by brazing. Is,
The inner fin is provided with a brazing material layer on both surfaces of a core material, and is brazed and joined to the inner peripheral surface of the tube so as not to contact the joining portion of the tube. .

  Invention of Claim 3 is a heat exchanger of Claim 1 or Claim 2, Comprising: The said tube and the said outer fin are laminated | stacked alternately, and the opening end part of the said tube is connected to multiple stages. A header tank is provided.

  The invention according to claim 4 is the heat exchanger according to claim 3, wherein the outer fin is made of a core material having no brazing material layer on both sides.

  According to the invention of claim 1, the inner surface of the tube not provided with the brazing material layer, the brazing material inside the tube (the brazing material layer on both sides of the inner fin) and the brazing material outside the tube (the brazing material layer on the outer surface of the tube). And is divided. This eliminates the flow of brazing material inside and outside the tube during brazing. In other words, when brazing, the brazing material flows from the inside of the tube to the outside of the tube and the brazing material in the tube is insufficient, or the brazing material flows from the outside of the tube to the inside of the tube and the brazing material outside the tube is insufficient. Nothing will happen.

  According to the invention of claim 2, as in the invention of claim 1, the inner surface of the tube not provided with the brazing material layer, the inner brazing material (the brazing material layer on both sides of the inner fin) and the outer brazing material of the tube (The brazing material layer on the outer surface of the tube). This eliminates the flow of brazing material inside and outside the tube during brazing. In other words, when brazing, the brazing material flows from the inside of the tube to the outside of the tube and the brazing material in the tube is insufficient, or the brazing material flows from the outside of the tube to the inside of the tube and the brazing material outside the tube is insufficient. Nothing will happen.

  In general, the total joint area in the tube (total area of the joint surface between the tube inner peripheral surface and the inner fin) is greater than the total joint area outside the tube (total area of the joint surface between the tube outer peripheral surface and the outer fin). Although it is large, it is not limited to this in the invention described in claim 1 or claim 2.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, it is possible to prevent the brazing material of the header tank from being excessively sucked into or out of the tube during brazing. That is, in the structure in which the tube communicates with the header tank as in claim 3, the brazing material of the header tank is excessive from the inside of the tube or the outside of the tube to the other through the joint portion of the tube during brazing. However, in the present invention, since there is no exchange of brazing material inside and outside the tube, it is possible to prevent the brazing material of the header tank from being excessively sucked.

  In addition, in Claim 1 or Claim 2, not only the structure of the heat exchanger of Claim 3, but also a heat exchanger that does not include a header tank, such as a serpentine type heat exchanger, is included in the scope of rights.

  According to the invention described in claim 4, in addition to the effect of the invention of claim 3, the outer fin not provided with the brazing material layer eliminates the exchange of the brazing material between the tubes. For this reason, even if a specific tube has a larger bonding area than other tubes unexpectedly, it is possible to reliably prevent a large amount of brazing material from flowing and collecting in the specific tube.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1st Embodiment: FIGS. 1-7 shows the heat exchanger of 1st Embodiment. In addition, the heat exchanger of this embodiment is utilized as a condenser which condenses while cooling the gas-phase refrigerant | coolant which distribute | circulates an inside.

"Overall structure of heat exchanger"
As shown in FIG. 1, the heat exchanger 1 of the first embodiment includes a plurality of outer fins 3, 3,... And a plurality of outer fins 3, 3,. The flat tubes 5, 5, and the outer fins 3, 3,... And the reinforcing side plates 11, 11 disposed on the outermost side in the stacking direction of the tubes 5, 5,. , And a pair of header tanks 7 and 9 that are communicated with the tubes 5 by inserting both open end portions of the tubes 5.

  A refrigerant inlet connector 15 is attached to the header tank 7 (left side in FIG. 1), and a refrigerant outlet connector 17 is attached to the header tank 9 (right side in FIG. 1). A partition member 27 that divides the header tanks 7 and 9 into a plurality of rooms is fitted in the header tanks 7 and 9.

  When the refrigerant is introduced into the header tank 7 from a refrigerant inlet side pipe (not shown) through the refrigerant inlet connector 15, the refrigerant passes through the tubes 5, 5,... So as to meander between the header tanks 7, 9. After the circulation, the refrigerant is finally led from the header tank 9 to the refrigerant outlet side pipe (not shown) through the refrigerant outlet connector 17. At this time, heat exchange is performed between the refrigerant flowing inside the tube 5 and the air flowing outside the tube 5.

"Header tank structure"
Next, the header tanks 7 and 9 will be mainly described in detail with reference to FIGS.

  Each of the header tanks 7 and 9 has a rectangular tube-shaped pipe 19 formed by combining the first member 21 and the second member 23 divided along the longitudinal direction, and both open end portions 19a and 19a of the pipe 19. The closing members 25 and 25 are closed. A partition member 27 that divides the internal space into a plurality of rooms in the longitudinal direction is disposed inside the header tanks 7 and 9.

  The first member 21 and the second member 23 are both formed in a U-shaped cross section.

  Specifically, the first member 21 includes a flat plate-like base portion 29 that is orthogonal to the longitudinal direction of the tube 5, and a pair of straight portions 31, 31 that are provided in a substantially orthogonal direction from both ends in the width direction of the base portion. The cross section is substantially U-shaped. The base 29 of the first member 21 includes tube insertion ports 33, 33,... For inserting the open end portions of the tubes 5. On the other hand, as with the first member 21, the second member 23 also has a flat plate-like base portion 35 that is orthogonal to the longitudinal direction of the tube 5, and a pair of straight members that protrude from both ends of the base portion 35 in the substantially orthogonal direction. The sections 37 and 37 are provided and have a substantially U-shaped cross section. The base 35 of the second member has an opening (not shown), and is attached in a state where the cylindrical portion 41 of the refrigerant inlet connector 15 (or the refrigerant outlet connector 17) is inserted into the opening.

  In this example, the width dimension of the first member 21 (the interval between the pair of straight portions 31, 31) is formed wider than the width dimension of the second member 23 (the interval between the pair of straight portions 37, 37). . The two members 21 and 23 are brazed and joined together with the outer peripheral surfaces of the straight portions 37 and 37 of the second member 23 fitted into the inner peripheral surfaces of the straight portions 31 and 31 of the first member 21.

  The base 35 of the second member 23 is provided with a support hole 43 that supports the protrusion 26 a of the closing member 25. In addition, support grooves 45 and 45 that support the wing portions 26 b and 26 b of the closing member 25 are provided in the straight portions 37 and 37 of the second member 23. The closing member 25 is positioned at a predetermined position by the support hole 43 and the support grooves 45, 45 of the second member 23. Further, the partition member 27 has the same shape as the closing member 25, and the partition member 27 is also provided with a protruding portion 28a and a wing portion 28b, and a support hole (not shown) and a support groove (not shown) formed in the second member 23. It is positioned at a predetermined position.

  Next, the material of the header tanks 7 and 9 will be mainly described.

  The material of the first member 21 is one in which a brazing material layer is integrally formed on one of the front and back sides of the core material 21a, and the first member 21 formed into a predetermined shape (U shape) is an outer peripheral surface of the core material 21a. A brazing material layer 21c is provided and no brazing material layer is provided on the inner peripheral surface.

  The material of the second member 23 is one in which the brazing material layer 23c is integrally formed on the entire one surface 23c of the front and back surfaces of the core material 23a, and the second member 23 formed into a predetermined shape (U-shape) In addition, a brazing material layer 23c is provided on the outer peripheral surface of the core material 23a.

  The material of the closing member 25 is obtained by integrally molding the brazing material layers 25b and 25c on the entire front and back surfaces of the core material 25a (FIG. 4).

  The material of the partition member 27 is obtained by integrally molding the brazing material layers 27b and 27c on the entire front and back surfaces of the core material 27a (FIG. 4).

  Thus, when the members of the header tanks 7 and 9 (the first member 21, the second member 23, and the closing member 25) are combined, a brazing material layer exists between the joining surfaces of the members, and the members are combined. In this state, the members of the header tanks 7 and 9 are integrally fixed by brazing at a predetermined temperature.

Note that the closing member 25 and the partition member 27 do not have a brazing material layer on their peripheral surfaces (surfaces that contact the inner peripheral surfaces of the first member 21 and the second member 23 constituting the pipe). The brazing material layers 25b and 25c on the front and back surfaces of the closing member 25 and the brazing material layers 27b and 27c on both the front and back surfaces of the partition member 27 are melted and wrap around the peripheral surface by capillary action. By this. The closing member 25 and the partition member 27 are brazed with the first member 21 and the second member 23.
"Tube structure"
5 and 6 show a tube. The tube 5 has a cylindrical shape, and is brazed to the header tanks 7 and 9 with both ends inserted into the tube insertion ports 33 of the header tanks 7 and 9. A corrugated inner fin 49 is provided inside the tube 5.

  Hereinafter, the manufacturing process of the tube 5 will be described with reference to FIG. First, as a material of the tube 5, a single long plate-shaped metal thin plate M in which a brazing material layer 5 c is integrally formed on either the front or back surface of the core material 5 a is prepared.

  Next, as shown in FIG. 6 a, both end portions in the width direction of the long sheet-like metal thin plate M as a raw material are wound inward to form the joint portions 47 and 47.

  Next, the material M is folded in two along the center line along the longitudinal direction so that the brazing material layer 5c is located on the outer peripheral surface side of the tube 5, and the joint portions 47 and 47 as the folded end portions are folded together. Use a tube. At this time, the inner fins 49 are inserted into the tube 5 as shown in FIG. As shown in FIG. 5, the inner fin 49 is formed by integrally forming brazing material layers 49b and 49c on both the front and back surfaces of the core material 49a.

  Finally, when brazing the entire heat exchanger 1, the joint portions 47, 47 of the tube 5 are brazed, and the inner surface of the tube 5 and the inner fin 49 are brazed. Thereby, the tube 5 is completed. At the same time, the outer surface of the tube 5 and the outer fin 3 are brazed, and the outer surface of both ends of the tube 5 and the inner peripheral edge of the tube insertion port 33 of the header tanks 7 and 9 are brazed. Moreover, each member of the header tank 7 is brazed. In this embodiment, the material of the outer fin 3 is composed only of a core material that does not include a brazing material.

  Here, in this embodiment, the inner fin 49 includes the brazing material layers 49b and 49c on both surfaces of the core material 49a, and the inner peripheral surface of the tube 5 so as not to contact the joint portions 47 and 47 of the tube 5. It is a brazed joint.

"Manufacturing process of heat exchanger"
Next, the manufacturing process of the heat exchanger 1 of this embodiment will be briefly described.

  First, the outer fin 3, tube 5, inner fin 49, header tank 7 members (first member 21, second member 23, and closing member 25), partition members 27, connectors 15 and 17, and side members made of a predetermined material. Plates 11 and 11 are prepared.

  Next, each member is processed into a predetermined shape.

  Next, all the members are combined and temporarily fixed with a predetermined jig or the like to form a temporary assembly.

  Next, the temporary assembly is sintered at a predetermined temperature in a furnace, and the members are integrally brazed. That is, each member is fixed integrally by melting the brazing material layer of each member of the temporary assembly at a predetermined temperature and then cooling.

"Action"
According to the heat exchanger of the first embodiment, the inner surface of the tube 5 is not provided with a brazing material layer, but the brazing material layers 49b and 49c are provided on both surfaces of the inner fin 49, so that the tube 5 and the inner fin 49 are connected. Since the inner fin 49 is brazed and joined to the inner peripheral surface of the tube 5 so as not to come into contact with both the joint portions 47 and 47, as shown in FIG. In the vicinity of the portions 47 and 47, the brazing material in the tube 5 (the brazing material layers 49b and 49c on both surfaces of the inner fin 49) and the brazing material outside the tube 5 (the brazing material layer 5c on the outer surface of the tube 5) are divided. The brazing material flow blocking portion S is configured. The brazing material flow blocking section S separates the flow of brazing material in the tube 5 and the brazing material outside the tube 5 during brazing.

"effect"
The effects of the first embodiment will be summarized below.

  First, according to the first embodiment, as described above, the brazing material (the brazing material layers 49b and 49c on both sides of the inner fin 49) and the brazing material outside the tube 5 (the outer surface of the tube 5). Since there is a brazing material flow blocking portion S that divides the brazing material layer 5c) and blocks the flow of brazing material between the tube 5 and the outside of the tube 5, the brazing material in the tube 5 is joined during brazing. It is prevented that the tube 47 flows out of the tube 5 through the joint surface between the portions 47 and 47, and the brazing material outside the tube 5 flows into the tube 5 through the joint surface between the joint portions 47 and 47.

  This eliminates the shortage of brazing material inside or outside the tube 5.

  In this embodiment, the total joint area in the tube 5 (total area of the joint surface between the inner peripheral surface of the tube 5 and the inner fin 49) is equal to the total joint area outside the tube 5 (outer peripheral surface of the tube 5 and the outer fin 3). Larger than the total area of the joint surface). For this reason, the brazing material flow blocking portion S prevents the brazing material outside the tube 5 from flowing into the tube 5 and the lack of brazing material outside the tube.

  Secondly, according to the first embodiment, since the tubes 5 and the outer fins 3 are alternately stacked, and the header tanks 7 and 9 are connected to the open ends of the tubes 5 by brazing, The flow blocking part S acts more effectively. That is, at the time of brazing, the brazing material of the header tanks 7 and 9 (in this example, the brazing material of the brazing material layer 21 c on the outer surface of the first member 21) is combined with the brazing material of the brazing material layer 5 c on the outer surface of the tube 5. It is possible to prevent a shortage due to being sucked into 5. This is because in the structure where the tube 5 is connected to the header tanks 7 and 9, the brazing material of the header tanks 7 and 9 is joined together with the brazing material of the brazing material layer 5 c on the outer surface of the tube 5 at the time of brazing. This is due to the possibility of flowing into the tube 5 through the joint surface between 47 and 47.

  Thirdly, according to the first embodiment, the outer fin 3 is made of a core material that does not have a brazing material layer on both sides, so that the brazing material between the tubes 5 is not exchanged. For this reason, even if the structure in which one tube 5 has a larger joining area than the other tubes 5 unexpectedly, a large amount of brazing material can be prevented from flowing and collecting in the specific tube 5.

“Tube variants”
In the present invention, the brazing material in the tube (the brazing material layer on both sides of the inner fin) and the brazing material outside the tube (the brazing material layer on the outer surface of the tube) are separated to provide a space between the inside of the tube and the outside of the tube. As long as the flow of the brazing material is blocked, the tube may be deformed as follows. In the following description, the same or similar components are denoted by the same reference numerals, and descriptions of the configurations and the effects are omitted.

Second embodiment: Modification 1 of the tube
The tube 110 according to the first modification shown in FIG. 8 is formed by folding back a long plate-like material having a brazing material layer 110c on the entire outer surface of the core material 110a along the longitudinal direction, and joining both end portions in the width direction. Although it is the same as the tube 5 of 1st Embodiment of FIG. 5 by the point which brazes the parts 111 and 112, the structure of the junction parts 111 and 112 differs from the tube 5 of 1st Embodiment. Even in the tube 110 of the first modification, the brazing material flow blocking portion S that blocks the flow of the brazing material between the inside of the tube 110 and the outside of the tube 150 is provided, so that an effect is obtained as in the first embodiment. It is done.

Third embodiment: Modification 2 of the tube
The tube 120 of Modification 2 shown in FIG. 9 is also different from the tube 5 of the first embodiment in FIG. Even in the tube 120 of this modified example 2, since the brazing material flow blocking portion S that blocks the flow of brazing material between the inside of the tube 120 and the outside of the tube 120 is provided, the effect is obtained as in the first embodiment. It is done.

Fourth embodiment: Modification 3 of the tube
The tube 130 of Modification 3 shown in FIG. 10 is also different from the tube 5 of the first embodiment in FIG. 5 in the structure of the joint portions 131 and 132. Even in the tube 130 of the third modification, the brazing material flow blocking portion S that blocks the flow of the brazing material between the inside of the tube 130 and the outside of the tube 130 is provided, so that the effect is obtained as in the first embodiment. It is done. In addition, in the tube 130 of this modification 3, unlike the tube 5 of 1st Embodiment, the surface provided with the brazing material layer 5c of one joining part 131, and the surface which does not comprise the brazing material layer of the other joining part 132, , Are joined.

Fifth embodiment: Modification 4 of the tube
11 is different from the tube 5 of the first embodiment in FIG. 5 in the structure of the joints 141 and 142, but the brazing material between the inside of the tube 150 and the outside of the tube 150 is also different. Since the brazing material flow blocking portion S that blocks the flow of the material is provided, the effect can be obtained as in the first embodiment. Note that, in the tube 140 of the fourth modification, unlike the tube 5 of the first embodiment and the tubes 110 to 130 of the first to third modifications, one of the joint portions 141 and 142 at both ends in the width direction of the material (this example) In this case, the upper joint portion 141 is configured to be longer than the other (lower side in this example) joint portion 142, and one of the joint portions 141 is folded back so as to wind the other joint portion 142 into a substantially U-shape. ing. At the time of brazing, the joint portions 141 and 142 are brazed and joined together with the inner surface of the joint portion 141 in contact with the outer surface of the joint portion 142 having the brazing material layer.

Sixth embodiment: Modification 5 of the tube
The tube 150 of Modification 5 shown in FIG. 12 is also different from the tube 5 of the first embodiment in FIG. 5 in the structure of the joints 151 and 151. Even in the tube 150 of the modified example 5, since the brazing material flow blocking portion S that blocks the flow of brazing material between the inside of the tube 150 and the outside of the tube 150 is provided, the effect is obtained as in the first embodiment. It is done.

  In addition, in the tube 150 of this modification 5, each joining part 151,151 differs from the tube 5 of the 1st Embodiment, and the modifications 1-4 by the point which carried out brazing joining of the inner surfaces which do not have a brazing material layer. Yes. In general, it is considered that the structure in which the brazing material layer is present in at least one of the joint portions, such as the tube 5 in FIG. 5 and the tubes 110 to 140 in the first to fourth modifications, is superior in joint stability. Even in the structure of the tube 150 as shown in FIG. 3, the brazing material layers 150c and 150c on the outer surfaces of the joint portions 151 and 151 wrap around the inner surfaces of the joint portions 151 and 151 via the terminals. Is secured.

  Hereinafter, the tubes 160 to 180 of the modified examples 6 to 8 are different from the tubes 110 to 140 of the modified examples 1 to 5 in that they are formed by combining a plurality (here, two) of thin metal plates as materials.

Seventh embodiment: Modification 6 of the tube
A tube 160 of Modification 6 shown in FIG. 13 has a structure in which the joining portions 161 and 162 at both ends in the width direction of the thin metal plates M1 and M2 are joined using two thin metal plates M1 and M2 as materials. In that respect, it differs from the tube 110 of the first modification of FIG. Therefore, the same effect as that of the tube 110 of the first modification shown in FIG. 8 can be obtained.

Eighth embodiment: Modification 7 of the tube
A tube 170 of Modification 7 shown in FIG. 14 has a structure in which the joining portions 171 and 171 at both ends in the width direction of the thin metal plates M1 and M2 are joined using two thin metal plates M1 and M2 as materials. In this respect, the configuration is different from that of the tube 120 of Modification 2 in FIG. 9, but the other configurations are the same. Therefore, the same effect as that of the tube 120 of the second modification of FIG. 9 can be obtained.

Ninth embodiment: Modification 8 of the tube
The tube 180 of Modification 8 shown in FIG. 15 has a structure in which the joining portions 181 and 182 at both ends in the width direction of the thin metal plates M1 and M2 are joined using two thin metal plates M1 and M2 as materials. This is different from the tube 130 of Modification 3 in FIG. 10, but the other configurations are the same. Therefore, the same effect as that of the tube 130 of the modified example 3 in FIG. 10 can be obtained.

  In short, according to the present invention, the inner surface of the tube is not provided with a brazing material layer, but is provided with a brazing material layer on both sides of the inner fin, and the tube and the inner fin are joined. Because it is brazed and joined to the inner peripheral surface of the tube so as not to contact the tube joint, the brazing material in the tube (the brazing material layer on both sides of the inner fin) and the brazing material outside the tube (the brazing material on the outer surface of the tube) Layer). Therefore, the flow of the brazing material melted at the time of brazing is divided into the flow of the brazing material in the tube and the flow of the brazing material outside the tube. As a result, when brazing, the brazing material flows from the tube to the outside of the tube and the brazing material in the tube is insufficient, or the brazing material flows from the outside of the tube to the tube and the brazing material outside the tube is insufficient. Nothing will happen.

  The heat exchanger of the above embodiment is a heat exchanger in which the tube and the header tank are brazed and joined in a state where the tube is inserted into the tube insertion port of the header tank. (I) A header is formed by forming a cylindrical tank portion projecting in the tube stacking direction at the end portion in the longitudinal direction of the tube, and brazing the tank portions of adjacent tubes in the stacking direction. It may be a heat exchanger in which a tank is configured. In the present invention, (ii) a heat exchanger that does not include a header tank such as a serpentine type may be used.

FIG. 1 is a front view showing an overall configuration of a heat exchanger according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view around the header tank of the heat exchanger. FIG. 3 is a cross-sectional view of the heat exchanger header tank in a portion where the tube insertion port is located. FIG. 4 is a cross-sectional view of a portion of the header tank where a blocking member (or partition member) is located. FIG. 5 is a sectional view of the tube of the header tank. FIG. 6 is an explanatory view showing a part of the manufacturing process of the tube. 7 is a sectional view taken along line IV-IV in FIG. FIG. 8 is a diagram showing a modification 1 of the tube as the second embodiment of the present invention. FIG. 9 is a diagram showing a second modification of the tube as the third embodiment of the present invention. FIG. 10 is a view showing a third modification of the tube as the fourth embodiment of the present invention. FIG. 11 is a view showing a modification 4 of the tube as the fifth embodiment of the present invention. FIG. 12 is a view showing a modified example 5 of the tube as the sixth embodiment of the present invention. FIG. 13 is a view showing a sixth modification of the tube as the seventh embodiment of the present invention. FIG. 14 is a view showing a modified example 7 of the tube as the eighth embodiment of the present invention. FIG. 15 is a view showing a modified example 8 of the tube as the ninth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger 3 ... Outer fin 5 ... Tube 5a ... Core material 5c ... Raw material layer 7, 9 ... Header tank 47, 47 ... Joint part 49 ... Inner fin 49a ... Core material 49b, 49c ... Raw material layer 110 ... Tube (Modification 1)
111, 112 ... Joint 120 ... Tube (Modification 2)
121, 121 ... Joint 130 ... Tube (Modification 3)
131, 132 ... Joint 140 ... Tube (Modification 4)
141, 142 ... Joint 150 ... Tube (Modification 5)
150c ... Raw material layers 151, 151 ... Junction 160 ... Tube (Modification 6)
161, 162 ... Junction 170 ... Tube (Modification 7)
171, 171 ... Junction 180 ... Tube (Modification 8)
181, 182 ... Junction M ... Metal sheet (tube material)
M1, M2 ... Metal sheet (tube material)
S ... Raw material flow blocking part

Claims (4)

Tubes (5) (110) (120) (130) (140) (150) as heat transfer tubes,
An outer fin (3) joined by brazing to the outer surface of the tube (5) (110) (120) (130) (140) (150);
An inner fin (49) that is brazed into the tube (5) (110) (120) (130) (140) (150);
A heat exchanger (1) comprising:
The tubes (5), (110), (120), (130), (140), and (150) are formed of a single sheet metal (M) having a brazing material layer (5c) only on one surface of the core material (5a). Then, after being bent and deformed into a cylindrical shape so that the brazing material layer (5c) is on the outer peripheral surface side, the joint portions (47, 47) (111, 111) (121, 121) (131, 131) (141, 142) ) (151, 151) are joined by brazing,
The inner fin (49) has a brazing material layer (49b, 49c) on both sides of a core material (49a) and the tubes (5) (110) (120) (130) (140) (150). ) Joined by brazing to the inner peripheral surface of the tube so as not to contact the joints (47, 47) (111, 111) (121, 121) (131, 131) (141, 142) (151, 151) A heat exchanger (1) characterized in that Tubes (160) (170) (180) as heat transfer tubes,
An outer fin (3) brazed to the outer surface of the tubes (160) (170) (180);
Inner fins (49) in the tubes (160) (170) (180);
A heat exchanger (1) comprising:
The tubes (160), (170), (180) include a plurality of thin metal plates (M1, M2) having a brazing material layer (5c) only on one surface of the core material (5a), and the brazing material layer (5c). Are joined so as to be on the outer peripheral surface side, and then joined to each other by brazing and joining portions (161, 162) (171, 171) (181, 182).
The inner fin (49) is provided with brazing material layers (49b, 49c) on both sides of the core material (49a), and the joints (161, 162) of the tubes (160) (170) (180). (171, 171) A heat exchanger (2) characterized by being brazed and joined to the inner peripheral surface of the tube so as not to contact (181, 182). A heat exchanger (1) according to claim 1 or claim 2, wherein
The tubes (5) (110) (120) (130) (140) (150) (160) (170) (180) and the outer fins (3) are alternately laminated,
The tube (5) (110) (120) (130) (140) (150) (160) (170) (180) is provided with a header tank (7, 9) to which an open end is brazed. Characteristic heat exchanger (1). A heat exchanger (1) according to claim 3,
The said outer fin (3) consists of a core material which does not have a brazing material layer on both surfaces, The heat exchanger (1) characterized by the above-mentioned.

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