JPWO2018138869A1 - Heat exchanger, air conditioner equipped with heat exchanger, and method of manufacturing heat exchanger - Google Patents

Abstract

The heat exchanger includes a plurality of heat exchanger cores having a plurality of plate-like fins and a plurality of heat transfer tubes in which notches are formed. The plurality of fins are arranged so that the planes face each other. The plurality of heat transfer tubes are hairpin tubes bent into a U shape. The hairpin tube is arranged in the notch of the fin so as to extend in a direction intersecting the plane of the fin. The plurality of heat exchanger cores are juxtaposed in a direction that intersects the direction of the notch of the fin and along the plane of the fin. A brazing sheet is disposed between adjacent heat exchanger cores. Adjacent heat exchanger cores are brazed with a brazing sheet.

Description

  The present invention relates to a heat exchanger that performs heat exchange between a refrigerant and air, an air conditioner including the heat exchanger, and a method for manufacturing the heat exchanger.

  Conventionally, a fin tube type heat exchanger having heat transfer tubes and fins is known as a heat exchanger for an air conditioner. Examples of the heat transfer tube include a circular tube having a circular cross section, or a flat tube having a rectangular cross section. In this specification, a heat exchanger using a circular tube is referred to as a circular tube heat exchanger, and a heat exchanger using a flat tube is referred to as a flat tube heat exchanger.

  As a method for manufacturing a flat tube heat exchanger, a manufacturing method is known in which a U-shaped notch extending from one end of the fin in the short direction of the fin is formed, and the flat tube is press-fitted into the notch. The circular tube heat exchanger is manufactured by forming a circular hole in the fin and inserting the circular tube into the hole. In such a circular tube heat exchanger, the heat exchanger cores are not juxtaposed in the vertical direction. On the other hand, as described in Patent Document 1, for example, flat tube heat exchangers are known in which a plurality of heat exchanger cores are juxtaposed in the vertical direction.

Japanese Patent No. 5980424

  Generally, in a flat tube heat exchanger in which a plurality of heat exchanger cores are juxtaposed in the vertical direction, adjacent heat exchanger cores are connected by a connecting member. Therefore, when a load is applied to the flat tube heat exchanger, there is a concern that the relative positional relationship of the heat exchanger core may be shifted due to the dropping of the connecting member or the shift generated between the connecting member and the heat exchanger. Is done.

  The present invention has been made to solve the above-described problems, and includes a heat exchanger that suppresses a shift in the relative positional relationship of the heat exchanger core, an air conditioner including the heat exchanger, and heat. It aims at providing the manufacturing method of an exchanger.

  The heat exchanger according to the present invention is a heat exchanger provided with a plurality of heat exchanger cores having a plurality of flat fins formed with notches and a plurality of heat transfer tubes. The heat transfer tube is disposed in the notch of the fin so as to extend in a direction intersecting the plane of the fin, and the plurality of heat exchanger cores intersect with the direction of the notch. In addition, the heat exchanger cores adjacent to each other are juxtaposed in a direction along the plane of the fins and adjacent to each other.

  Moreover, the manufacturing method of the heat exchanger which concerns on this invention is the manufacturing method of the heat exchanger provided with two or more heat exchanger cores which have several flat fin and the several heat exchanger tube in which the notch is formed. Forming the heat exchanger core disposed in the notches of the fins such that the fins are disposed so that the planes face each other, and the heat transfer tube extends in a direction intersecting the plane of the fins; A step of juxtaposing a plurality of the heat exchanger cores in a direction intersecting with the direction of the notches and along a plane of the fins, and joining the adjacent heat exchanger cores.

  According to the heat exchanger according to the present invention, the plurality of heat exchanger cores are juxtaposed in the direction along the plane of the fin, intersecting the direction of the notch formed in the fin, and adjacent to the heat exchanger. The core is joined. Therefore, the occurrence of a shift in the relative positional relationship between adjacent heat exchanger cores is suppressed.

It is a perspective view of the outdoor unit in which the flat tube heat exchanger which concerns on Embodiment 1 of this invention is mounted. It is a figure which shows the conventional flat tube heat exchanger mounted in the outdoor unit of an air conditioner. It is a figure which shows the flat tube heat exchanger which concerns on Embodiment 1. FIG. 1 is a cross-sectional view of a flat tube heat exchanger according to Embodiment 1. FIG. It is a figure which expands and shows the part corresponded to the part shown with the code | symbol D in FIG.4 (b). It is sectional drawing of the flat tube heat exchanger which concerns on Embodiment 2 of this invention. It is a figure which expands and shows the part corresponded to the part shown with the code | symbol F in FIG.6 (b). It is sectional drawing of the flat tube heat exchanger which concerns on Embodiment 3 of this invention. It is sectional drawing of the flat tube heat exchanger which concerns on Embodiment 4 of this invention. It is sectional drawing before electric furnace injection | throwing-in of the flat tube heat exchanger which concerns on Embodiment 5 of this invention. It is sectional drawing of the flat tube heat exchanger which concerns on Embodiment 6 of this invention. It is a figure which shows the flat tube heat exchanger which concerns on Embodiment 7 of this invention. It is sectional drawing of the flat tube heat exchanger which concerns on Embodiment 7 of this invention. It is a figure which shows the flat tube heat exchanger which concerns on Embodiment 8 of this invention. It is a figure which shows the flat tube heat exchanger which concerns on Embodiment 9 of this invention. It is a figure which shows 1 process of manufacture of a heat exchanger core. It is a figure which shows 1 process of manufacture of a flat tube heat exchanger. It is a figure which shows 1 process of manufacture of a flat tube heat exchanger.

  Embodiments of a heat exchanger according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments described below. In the following drawings, the size of each component may be different from that of an actual apparatus.

Embodiment 1 FIG.
FIG. 1 is a perspective view of an outdoor unit on which the flat tube heat exchanger according to Embodiment 1 of the present invention is mounted. FIG. 1A is a perspective view of the entire outdoor unit 200, and FIG. 1B is a perspective view showing a state in which some members are removed from the outdoor unit 200. 1A and 1B, the X direction is the front-rear direction of the outdoor unit 200, the Y direction is the left-right direction of the outdoor unit 200, and the Z direction is the vertical direction of the outdoor unit 200. The outdoor unit 200 has a vertically long outline as a whole. The outdoor unit 200 includes an upper front panel 51, a lower front panel 52, a left side panel 53, and a fan guard 54. The outdoor unit 200 includes a back panel located on the back side facing the upper front panel 51 and the lower front panel 52, and a right side panel located on the right side facing the left side panel 53. . The back panel and the right side panel are located at positions not shown in FIG. The upper front panel 51 and the lower front panel 52 constitute an outer shell on the front side of the outdoor unit 200. The left side panel 53 constitutes an outer shell on the left side of the outdoor unit 200. The right side panel constitutes an outer shell on the right side of the outdoor unit 200. The back panel constitutes an outer shell on the back side of the outdoor unit 200. The fan guard 54 is provided in the upper part of the outdoor unit 200.

  An air suction port 59 is formed in the left side panel 53. An air inlet similar to the air inlet 59 is also formed in the back panel and the right side panel. An air outlet 55 is formed in the fan guard 54.

  As shown in FIG.1 (b), the outdoor unit 200 has the base panel 56 arrange | positioned at the lower part. The base panel 56 constitutes an outer shell on the bottom side of the outdoor unit 200. The base panel 56 is provided with a flat tube heat exchanger 101, a compressor 57, and an accumulator 58. The flat tube heat exchanger 101, the compressor 57, and the accumulator 58 are fixed to the base panel 56 by, for example, screwing.

  The flat tube heat exchanger 101 is disposed to face the left side panel 53, the back panel, and the right side panel. That is, the cross-sectional shape of the flat tube heat exchanger 101 cut along a plane parallel to the X direction and the Y direction has a U shape. The flat tube heat exchanger 101 is fixed to the base panel 56 and to the left side panel 53 as described above. A refrigerant is supplied to the flat tube heat exchanger 101. Further, air taken in from the air inlet 59 and the air inlets of the back panel and the right side panel passes through the flat tube heat exchanger 101. In the flat tube heat exchanger 101, heat exchange is performed between the refrigerant and the passing air. The flat tube heat exchanger 101 functions as a condenser, that is, a radiator, during the cooling operation of the air conditioner to which the outdoor unit 200 is connected, and condenses and liquefies the refrigerant. The flat tube heat exchanger 101 functions as an evaporator during the heating operation of the air conditioner to which the outdoor unit 200 is connected, and evaporates and evaporates the refrigerant.

  The compressor 57 compresses and discharges the refrigerant. An accumulator 58 is connected to the suction side of the compressor 57. The accumulator 58 is for storing a liquid refrigerant. The discharge side of the compressor 57 is connected to the flat tube heat exchanger 101 during the cooling operation of the air conditioner to which the outdoor unit 200 is connected, and the use side heat mounted in the indoor unit (not shown) during the heating operation of the air conditioner. Connected to the exchanger.

  In addition, the outdoor unit 200 is equipped with a fan (not shown) that is used to take air into the outdoor unit 200 and exhaust the air out of the outdoor unit 200. The fan is disposed in the upper part of the outdoor unit 200 and is covered so as to be surrounded by the fan guard 54. When the fan rotates, air is taken into the outdoor unit 200 from the air suction port 59 and the air suction ports of the rear panel and the right side panel, and the air in the outdoor unit 200 passes from the air outlet 55 to the outdoor unit 200. Released outside.

  FIG. 3 is a diagram showing a flat tube heat exchanger according to the first embodiment. FIG. 3A is an overall view of the flat tube heat exchanger 101, and shows a state before being bent into a U-shape. FIG. 3B is an enlarged view of a portion indicated by reference numeral B in FIG. 3A, that is, a hairpin bending portion of the flat tube of the flat tube heat exchanger 101. The flat tube heat exchanger 101 has two heat exchanger cores 11 and a heat exchanger core 12. The heat exchanger core 11 and the heat exchanger core 12 include a hairpin tube 1 which is a U-bent flat tube heat transfer tube and a plurality of fins. The plurality of fins are arranged in parallel so that the planes of adjacent fins face each other. In FIG. 3, the plurality of fins is illustrated as a fin assembly 3. In the plurality of fins, a U-shaped notch is formed in one side end portion of the pair of side end portions extending in the longitudinal direction along the short direction of the fin. The hairpin tube 1 is press-fitted into U-shaped notches of a plurality of fins. At one end of the heat exchanger core 11 and the heat exchanger core 12, the hairpin portion of the hairpin tube 1 that is bent in a U shape is located. The end portion of the hairpin tube 1 located at the other end portion of the heat exchanger core 11 and the heat exchanger core 12 is a cut portion where the cross-sectional shape of the flat tube can be visually recognized. A joint (not shown) for connecting the flat tube and the circular tube, a header 5, and a distributor 6 are connected to the cut portion of the hairpin tube 1.

  In the following description, the step direction is a direction that intersects the direction of the notch of the fin and is along the plane of the fin. That is, the step direction is the vertical direction of the flat tube heat exchanger 101 and is the direction that coincides with the Z direction in FIG.

  The two heat exchanger cores 11 and the heat exchanger core 12 are juxtaposed in the step direction. In other words, the two heat exchanger cores 11 and the heat exchanger core 12 are juxtaposed along the vertical direction. The heat exchanger core 11 and the heat exchanger core 12 are joined by the brazing sheet 7. By putting the heat exchanger core 11 and the heat exchanger core 12 in the step direction and inserting the brazing sheet 7 between them into the electric furnace, the two heat exchanger core 11 and the heat exchanger core 12 are Brazed and joined.

  According to the first embodiment, the heat exchanger core 11 and the heat exchanger core 12 are juxtaposed in the step direction and joined by the brazing sheet 7. Therefore, even if a load is applied to the flat tube heat exchanger 101, a shift in the relative positional relationship between the heat exchanger core 11 and the heat exchanger core 12 can be suppressed.

  Moreover, since the two heat exchanger cores 11 and the heat exchanger cores 12 are abutted and the brazing sheet 7 is inserted between them and put into the electric furnace, the assemblability at the time of manufacturing the flat tube heat exchanger 101 is good. . Moreover, the manufacturing time and manufacturing cost of the flat tube heat exchanger 101 can be suppressed.

Here, the effect of the heat exchanger according to the first embodiment will be described in comparison with the conventional heat exchanger.
FIG. 2 is a view showing a conventional flat tube heat exchanger mounted on an outdoor unit of an air conditioner. 2, the same members as those of the flat tube heat exchanger 101 according to the first embodiment described with reference to FIG. 3 are denoted by the same reference numerals. Description of these members is omitted. A conventional flat tube heat exchanger 100 includes a heat exchanger core 111 and a heat exchanger core 10. The heat exchanger core 111 and the heat exchanger core 10 each have the fin assembly 3. The heat exchanger core 111 and the heat exchanger core 10 are connected and fixed by connecting members 4 arranged at intervals in a direction intersecting the plane of the fins of the fin assembly 3. The connecting member 4 is fitted into the hairpin tube 1, and the heat exchanger core 111 and the heat exchanger core 10 are fixed by this configuration. In some cases, the connecting member 4 is fixed to the hairpin tube 1 with an adhesive.

  In the conventional flat tube heat exchanger 100 of FIG. 2, the connecting member 4 that connects the heat exchanger core 111 and the heat exchanger core 10 is spaced apart in the direction that intersects the plane of the fins of the fin assembly 3. Are arranged. Accordingly, fins cannot be arranged in the portion where the connecting member 4 is arranged. That is, in the direction in which the hairpin tube 1 extends through the fins, a portion where no fins are present occurs. On the other hand, according to the first embodiment, since the two heat exchanger cores 11 and the heat exchanger cores 12 are juxtaposed in the step direction, the hairpin tube 1 extends in the direction through which the fins are inserted. The part which cannot arrange | position a fin does not arise. As described above, according to the first embodiment, it is possible to arrange a larger number of fins than in the conventional example. As a result, in the flat tube heat exchanger 101, high heat exchange properties can be ensured.

  FIG. 4 is a cross-sectional view of the flat tube heat exchanger according to the first embodiment. 4A is a cross-sectional view of the flat tube heat exchanger taken along the line AA in FIG. 3A, and FIG. 4B is a line CC in FIG. 4A. It is arrow sectional drawing. 4 (a) and 4 (b), the horizontal direction in the figure coincides with the step direction. As shown in FIG. 4B, the end surface of the fin 211 of the heat exchanger core 11 facing the heat exchanger core 12 is not bent, and the fin of the heat exchanger core 12 is not subjected to bending. In 212, the end surface facing the heat exchanger core 11 is not bent. And the brazing sheet 7 is inserted between the heat exchanger core 11 and the heat exchanger core 12 as described above. That is, the brazing sheet 7 is interposed between the end surfaces of the fins that are not bent.

  Here, the combination of the material of the fin 2, the hairpin tube 1, and the brazing sheet 7 in this Embodiment 1 is demonstrated. The first combination is a combination in which a bare material is used for the fin 2, a clad tube is used for the hairpin tube 1, and no brazing material is used for brazing the fin 2 and the hairpin tube 1. The second combination is a combination in which a clad material is used for the fin 2, a bare tube is used for the hairpin tube 1, and no brazing material is supplied for brazing the fin 2 and the hairpin tube 1. The third combination is a combination that uses a bare material for the fin 2, uses a bare tube for the hairpin tube 1, and uses a placing brazing method that supplies a brazing material to braze the fin 2 and the hairpin tube 1. Here, the bare material is a material made of a core material, and the clad material is a material in which a core material and a brazing material are bonded together. The bare tube is a flat tube having no brazing material on its surface, and the clad tube is a flat tube having a brazing material layer on its surface.

  In the first combination, a clad tube is used for the hairpin tube 1, that is, a flat tube. By using a clad tube for the hairpin tube 1, a bare material that does not require a brazing material layer can be used for the fin 2. The aluminum brazing material contains Si, that is, silicon. Since Si has a very high hardness, there is a concern that the wear of the cutting edge of the die cutting blade used at the time of forming the fin 2 is promoted. By using a bare material that does not require brazing material for the fins 2, it is possible to reduce wear of the cutting edge of the cutting blade.

  In the second combination, a clad material is used for the fin 2. By using a clad material for the fin 2, a bare tube made of only a core material can be used for the hairpin tube 1. As a result, cost can be reduced.

  In the third combination, a bare material is used for the fin 2 and the hairpin tube 1, and a placing wax is used. The brazing material is a brazing material that is set in the vicinity of the brazing point when the electric furnace is charged in order to supply the brazing material between the workpieces to be brazed at the time of brazing. With the brazing filler metal, the amount of brazing filler metal can be easily adjusted and changed, and by using the brazing wax, an effect of reducing wear of the cutting edge of the cutting blade of the mold can be obtained. Therefore, the production cost of the heat exchanger core 11 and the heat exchanger core 12 can be suppressed by using the placing wax.

  FIG. 5 is an enlarged view of a portion corresponding to the portion indicated by reference sign D in FIG. FIG. 5 shows the flat tube heat exchanger at a stage before being put into the electric furnace. FIG. 5A shows an example in which a bare material made only of the core material 2 a is used for the fin 2 and a brazing material 7 b is used for the brazing sheet 7. By using the bare material of only the core material 2a for the fin 2, the effect of suppressing the wear of the cutting edge of the cutting blade can be obtained. Further, by using the brazing material 7b for the brazing sheet 7, the brazing sheet 7 is melted after the electric furnace is charged, so that the design of the joint portion is improved.

  FIG. 5B shows an example in which a clad material having a core material 2 a and a brazing material 2 b is used for the fin 2 and a brazing material is used for the brazing sheet 7. Since the clad material having the brazing material 2 b is used for the fin 2, a bare tube can be used for the hairpin tube 1. The production cost of the heat exchanger core 11 and the heat exchanger core 12 can be suppressed by using the bare pipe. Moreover, by using the brazing sheet 7, the designability of the joint portion is improved as in the example of FIG.

  FIG. 5C shows an example in which a clad material having a core material 2 a and a brazing material 2 b is used for the fin 2, and a bare material including only the core material 7 a is used for the brazing sheet 7. By supplying the brazing material used for brazing the fins 2 and the brazing sheet 7 from the brazing material 2b of the fins 2, a bare material can be used for the brazing sheet 7. Therefore, the cost of the brazing sheet 7 can be suppressed. Moreover, since the fin 2 and the brazing sheet 7 are metal-bonded by brazing, the heat transfer area of the fin 2 is expanded. Therefore, the heat exchange performance of the heat exchanger core 11 and the heat exchanger core 12 heat exchanger is improved.

  FIG. 5D shows an example in which a bare material having only the core material 2 a is used for the fin 2 and a clad material in which a brazing material 7 b is formed on the surface of the core material 7 a is used for the brazing sheet 7. By using a bare material for the fin 2, there is an effect of suppressing wear of the cutting edge of the cutting blade. Since the clad material is used for the brazing sheet 7, the core material of the brazing sheet 7 remains after the electric furnace is charged, and the fins 2 and the brazing sheet 7 are brazed and metal-bonded. As a result, the heat transfer area of the fin 2 is expanded, and the heat exchange performance of the heat exchanger core 11 and the heat exchanger core 12 heat exchanger is improved.

  FIG. 5E shows an example in which a clad material having a core material 2a and a brazing material 2b is used for the fin 2 and a clad material in which a brazing material 7b is formed on the surface of the core material 7a is used for the brazing sheet 7. is there. After charging the electric furnace, the core material of the brazing sheet 7 remains, and the fins 2 and the brazing sheet 7 are brazed and metal-bonded. As a result, the heat transfer area of the fin 2 is expanded, and the heat exchange performance of the heat exchanger core 11 and the heat exchanger core 12 heat exchanger is improved. In addition, since a larger amount of brazing material is supplied to the brazed portion, the shortage of brazing material is eliminated and the brazing is stably performed.

  In the first embodiment, the brazing sheet 7 is joined by brazing, but is not limited thereto. The brazing sheet 7 may be joined with an adhesive. The fin 2 and the hairpin tube 1 may be brazed at the time of brazing the heat exchanger core 11 and the heat exchanger core 12 with the brazing sheet 7, or the heat exchanger core 11 with the brazing sheet 7. Before the brazing between the heat exchanger core 12 and the heat exchanger core 12, it may be performed in a separate process. The header 5 and the distributor 6 may be brazed by putting them into an electric furnace at a time when the heat exchanger cores using the brazing sheet 7 are brazed together. Alternatively, the header 5 and the distributor 6 may be brazed in a separate process before and after the brazing process between the heat exchanger cores.

Embodiment 2. FIG.
FIG. 6 is a cross-sectional view of a flat tube heat exchanger according to Embodiment 2 of the present invention. 6A is a cross-sectional view showing the flat tube heat exchanger according to Embodiment 2 cut at a position corresponding to the position of the line AA in FIG. 3A, and FIG. These are sectional views taken on line EE in FIG. 6 (a) and 6 (b), the horizontal direction in the figure coincides with the step direction.

  As shown in FIGS. 6A and 6B, the heat exchanger core 112 and the heat exchanger core 122 are juxtaposed in the step direction. As shown in FIG. 6B, the end surface of the fin 221 of the heat exchanger core 112 facing the heat exchanger core 122 is bent, and the fin collar 8 is formed. Similarly, in the fin 222 of the heat exchanger core 122, the end surface facing the heat exchanger core 112 is bent, and the fin collar 8 is formed. That is, in the heat exchanger core 112 and the heat exchanger core 122 that are abutted, the fins 221 and the fins 222 on the abutting side are bent. The brazing sheet 7 is inserted between the heat exchanger core 112 and the heat exchanger core 122. That is, the brazing sheet 7 is interposed between the end surface of the fin 221 that has been subjected to bending and the end surface of the fin 222 that has been subjected to bending.

  In the second embodiment, since the brazing sheet 7 is interposed between the end surfaces of the fins 221 and fins 222 that have been subjected to bending processing, the contact area between the fins 221 and the brazing sheet 7 and the fins 222 and brazing. A wider contact area with the sheet 7 can be secured. Therefore, the fins 221 and 222 and the brazing sheet 7 can be brazed stably. Further, the bonding strength by brazing the fins 221 and 222 and the brazing sheet 7 increases.

  FIG. 7 is an enlarged view of a portion corresponding to the portion indicated by the symbol F in FIG. FIG. 7 shows a flat tube heat exchanger at a stage before being put into the electric furnace. FIG. 7A shows an example in which the bare material of only the core material 2 a is used for the fins 221 and the fins 222 and the brazing material 7 b is used for the brazing sheet 7. By using a bare material for the fin 221 and the fin 222, an effect of suppressing wear of the cutting edge of the cutting blade of the mold can be obtained. Further, by using the brazing material 7b for the brazing sheet 7, the brazing sheet 7 is melted after the electric furnace is charged, so that the design of the joint portion is improved. Further, in the heat exchanger core 112 and the heat exchanger core 122, the fin 221 and the fin 222 on the end surfaces on the abutting side are bent to form the fin collars 8 respectively, and the above-described effects are obtained. can get.

  FIG. 7B shows an example in which a clad material having a core material 2 a and a brazing material 2 b is used for the fins 221 and 222 and a brazing material is used for the brazing sheet 7. Since the clad material having the brazing material 2 b is used for the fins 221 and the fins 222, a bare tube can be used for the hairpin tube 1. By using the bare pipe, the manufacturing cost of the heat exchanger core 112 and the heat exchanger core 122 can be suppressed. Moreover, the designability of a joining location improves by using the brazing sheet 7. FIG. Further, since a large amount of brazing material is supplied to the brazed portion, the shortage of brazing material at the time of joining is eliminated, and there is an effect that brazing can be stably performed.

  FIG. 7C shows an example in which a clad material is used for the fins 221 and 222, and a bare material including only the core material 7 a is used for the brazing sheet 7. By supplying the brazing material used for brazing the fins 221 and 222 and the brazing sheet 7 from the brazing material layer of the fins 221 and 222, the brazing sheet 7 can be made into a bare material. Therefore, the cost of the brazing sheet 7 can be suppressed. Since the fins 221 and 222 and the brazing sheet 7 are metal-bonded by brazing, the heat transfer areas of the fins 221 and 222 are expanded, and the heat exchange performance of the flat tube heat exchanger is improved. Further, in the heat exchanger core 112 and the heat exchanger core 122, the end surfaces of the fins 221 and 222 that are in contact with each other are bent to form the fin collar 8, and the above-described effects are obtained. can get.

  FIG. 7D shows an example in which a bare material made only of the core material 2 a is used for the fins 221 and 222 and a clad material in which a brazing material 7 b is formed on the surface of the core material 7 a is used for the brazing sheet 7. By using a bare material for the fin 221 and the fin 222, there is an effect of suppressing wear of the cutting edge of the cutting blade of the mold. Since the clad material is used for the brazing sheet 7, the core material of the brazing sheet 7 remains after the introduction of the electric furnace, and the fins 221 and fins 222 and the brazing sheet 7 are brazed and metal-bonded. As a result, the heat transfer areas of the fins 221 and the fins 222 are expanded, and the heat exchange performance of the heat exchanger core 112 and the heat exchanger core 122 is improved. Further, in the heat exchanger core 112 and the heat exchanger core 122, the end surfaces of the fins 221 and 222 that are in contact with each other are bent to form the fin collar 8, and the above-described effects are obtained. can get.

  In FIG. 7E, the clad material having the core material 2a and the brazing material 2b is used for the fin 221 and the fin 222, and the clad material in which the brazing material 7b is formed on the surface of the core material 7a is used for the brazing sheet 7. This is an example. After the electric furnace is charged, the core material of the brazing sheet 7 remains, and the fins 221 and 222 and the brazing sheet 7 are brazed and metal-bonded. As a result, the heat transfer areas of the fins 221 and the fins 222 are expanded, and the heat exchange performance of the heat exchanger core 112 and the heat exchanger core 122 is improved. In addition, since a larger amount of brazing material is supplied to the brazed portion, the shortage of brazing material is eliminated and the brazing is stably performed. Further, in the heat exchanger core 112 and the heat exchanger core 122, the end surfaces of the fins 221 and 222 that are in contact with each other are bent to form the fin collar 8, and the above-described effects are obtained. can get.

Embodiment 3 FIG.
FIG. 8 is a cross-sectional view of a flat tube heat exchanger according to Embodiment 3 of the present invention. FIG. 8A is a cross-sectional view showing the flat tube heat exchanger according to Embodiment 3 cut at a position corresponding to the position of line AA in FIG. That is, Fig.8 (a) has shown the cut surface of the step direction of the flat tube heat exchanger which concerns on this Embodiment 3. FIG. FIG. 8B is a cross-sectional view taken along line GG in FIG. 8A and 8B, the horizontal direction in the figure coincides with the step direction. FIG. 8C is an enlarged view showing a portion corresponding to the portion indicated by the symbol H in FIG. FIG.8 (c) has shown the flat tube heat exchanger of the stage before throwing into an electric furnace. As shown in FIGS. 8A and 8B, the heat exchanger core 311 and the heat exchanger core 312 are juxtaposed in the step direction. As shown in FIG. 8C, in the third embodiment, a clad material having a core material 2a and a brazing material 2b is provided on the fins 231 of the heat exchanger core 311 and the fins 232 of the heat exchanger core 312. Used. A brazing sheet is not disposed between the heat exchanger core 311 and the heat exchanger core 312. When the two heat exchanger cores 311 and 312 are brought into contact with each other and put into an electric furnace, the fin material 231 and the brazing material 2b of the fin 232, which are clad materials, flow into the gap between the core materials 2a due to capillary action, and are brazed. Be joined. Since the brazing sheet is not provided, the assemblability at the time of manufacturing the flat tube heat exchanger is good, which leads to the suppression of manufacturing time and manufacturing cost.

Embodiment 4 FIG.
FIG. 9 is a cross-sectional view of a flat tube heat exchanger according to Embodiment 4 of the present invention. Fig.9 (a) is sectional drawing which cut | disconnects and shows the flat tube heat exchanger which concerns on this Embodiment 4 in the position corresponded to the position of line AA of Fig.3 (a). That is, Fig.9 (a) has shown the cut surface of the step direction of the flat tube heat exchanger which concerns on this Embodiment 4. FIG. FIG. 9B is a cross-sectional view taken along line II in FIG. 9A and 9B, the horizontal direction in the figure coincides with the step direction. FIG. 9C is an enlarged view of a portion corresponding to the portion indicated by the symbol J in FIG. FIG.9 (c) has shown the flat tube heat exchanger of the stage before throwing into an electric furnace. As shown in FIG. 9C, the end surface of the fin 241 of the heat exchanger core 411 facing the heat exchanger core 412 is bent, and the fin 242 of the heat exchanger core 412 is also bent. , The end surface facing the heat exchanger core 411 is also bent. That is, in the heat exchanger core 411 and the heat exchanger core 412 that are abutted, the fins 241 and the fins 242 on the abutting side are bent. The brazing sheet 7 is not disposed between the heat exchanger core 411 and the heat exchanger core 412.

  When the two heat exchanger cores 411 and the heat exchanger core 412 are in contact with each other and put into an electric furnace, the fin material 241 and the brazing material 2b of the fin 242 that are clad materials flow into the gap between the core materials 2a by capillary action, Brazed and joined. Since the brazing sheet is not provided, the assemblability at the time of manufacturing the flat tube heat exchanger is good, which leads to the suppression of manufacturing time and manufacturing cost. Further, in the heat exchanger core 411 and the heat exchanger core 412, the end surfaces of the fins 241 and 242 on the abutting side are bent to form the fin collar 8. Therefore, it is possible to secure a wider contact area between the fins 241 of the heat exchanger core 411 and the fins 242 of the heat exchanger core 412. As a result, the fins 241 and 242 can be brazed stably. Further, the bonding strength by brazing the fins 241 and 242 increases.

Embodiment 5 FIG.
FIG. 10 is a cross-sectional view of the flat tube heat exchanger according to Embodiment 5 of the present invention before charging the electric furnace. FIG. 10A is a cross-sectional view showing the flat tube heat exchanger according to Embodiment 5 cut at a position corresponding to the position of line AA in FIG. That is, Fig.10 (a) has shown the cut surface of the step direction of the flat tube heat exchanger which concerns on this Embodiment 5. FIG. FIG. 10B is a cross-sectional view taken along the line KK in FIG. 10 (a) and 10 (b), the horizontal direction in the figure coincides with the step direction. In the fifth embodiment, the heat exchanger core 511 and the heat exchanger core 512 are juxtaposed in the step direction. In the fins 252 of the heat exchanger core 512, the hairpin tube 1 is exposed on the end face of the heat exchanger core 512 that faces the heat exchanger core 511. In the fin 251 of the heat exchanger core 511, the end surface on the side that is abutted with the heat exchanger core 512 is bent. A brazing sheet 7 is inserted between the heat exchanger core 511 and the heat exchanger core 512. The brazing sheet 7 of the fifth embodiment is composed only of a brazing material. In the fifth embodiment, the hairpin tube 1 of the heat exchanger core 512 and the fins 251 of the heat exchanger core 511 are brazed. In general, flat tubes have characteristics that are more rigid and hard to deform than fins. Therefore, according to the fifth embodiment, the brazing is more stable as compared with the case where the fins are brazed.

Embodiment 6 FIG.
FIG. 11 is a cross-sectional view of a flat tube heat exchanger according to Embodiment 6 of the present invention. FIG. 11A is a cross-sectional view showing the flat tube heat exchanger according to the sixth embodiment cut at a position corresponding to the position of line AA in FIG. That is, Fig.11 (a) has shown the cut surface of the step direction of the flat tube heat exchanger which concerns on this Embodiment 6. FIG. FIG. 11B is a cross-sectional view taken along line LL in FIG. In Fig.11 (a) and FIG.11 (b), the horizontal direction in a figure corresponds with the step direction. In the sixth embodiment, the heat exchanger core 611 and the heat exchanger core 612 are juxtaposed in the step direction. In the fins 262 of the heat exchanger core 612, the hairpin tube 1 is exposed at the end face of the fin 262 that faces the heat exchanger core 611. In the fin 261 of the heat exchanger core 611, the end face on the side that is abutted with the heat exchanger core 612 is bent. A clad material having a core material and a brazing material is used for the fins 261 and 262. A brazing sheet is not disposed between the heat exchanger core 611 and the heat exchanger core 612. In the sixth embodiment, the hairpin tube 1 of the heat exchanger core 612 and the fins 261 of the heat exchanger core 611 are brazed. Therefore, as in the fifth embodiment, the brazing is more stable than the case where the fins are brazed. Further, by using a clad material for the fins 261 and 262, a brazing sheet is not necessary, and the number of parts can be reduced.

Embodiment 7 FIG.
FIG. 12 is a diagram showing a flat tube heat exchanger according to Embodiment 7 of the present invention. FIG. 12 is an overall view of the flat tube heat exchanger 107 and shows a state before being bent into a U-shape. FIG. 13 is a cross-sectional view of a flat tube heat exchanger according to Embodiment 7 of the present invention. FIG. 13A is a cross-sectional view showing the flat tube heat exchanger according to Embodiment 7 cut at a position corresponding to the position of line MM in FIG. That is, Fig.13 (a) has shown the cut surface of the step direction of the flat tube heat exchanger which concerns on this Embodiment 7. FIG. FIG. 13B is a cross-sectional view taken along line NN in FIG. 13A and 13B, the horizontal direction in the figure coincides with the step direction. In the seventh embodiment, the heat exchanger core 711 and the heat exchanger core 712 are juxtaposed in the step direction. In the fin 271 of the heat exchanger core 711 of the flat tube heat exchanger 107, the hairpin tube 1 is exposed at the end face on the side that is in contact with the heat exchanger core 712. Similarly, in the fins 272 of the heat exchanger core 712 of the flat tube heat exchanger 107, the hairpin tube 1 is exposed on the end surface of the fin 272 that faces the heat exchanger core 711. At least two spacer blocks 9 are disposed between the heat exchanger core 711 and the heat exchanger core 712. In the example shown in FIG. 12, five spacer blocks 9 are arranged. The spacer block 9 is a metal such as aluminum or stainless steel.

  A plurality of spacer blocks 9 are inserted between the heat exchanger core 711 and the heat exchanger core 712, and the spacer block 9 is in contact with the hairpin tube 1 using the clad tube having the brazing material layer. By putting in the furnace, the heat exchanger core 711 and the heat exchanger core 712 are joined via the hairpin tube 1 and the spacer block 9. In the seventh embodiment, since the hairpin tube 1 and the spacer block 9 both having rigidity are joined, stable brazing can be realized and the connection strength can be increased.

  In the example shown in FIG. 13, five spacer blocks 9 are provided, but the present invention is not limited to this. Two or more spacer blocks 9 may be provided. The brazing material may be supplied instead of the clad tube, or a spacer block 9 having a brazing material may be used. Further, the joining of the hairpin tube 1 and the spacer block 9 is not limited to brazing, and may be performed by an adhesive.

Embodiment 8 FIG.
FIG. 14 is a diagram showing a flat tube heat exchanger according to Embodiment 8 of the present invention. FIG. 14A is an overall view of the flat tube heat exchanger 108 and shows a state before being bent into a U-shape. FIG. 14B is an enlarged view of the portion indicated by the symbol O in FIG. 14A, that is, the hairpin bending portion of the flat tube of the flat tube heat exchanger 108. The flat tube heat exchanger 108 has a heat exchanger core 281 and a heat exchanger core 282. The heat exchanger core 281 and the heat exchanger core 282 are juxtaposed in the step direction. The heat exchanger core 281 and the heat exchanger core 282 have a plurality of fins. The plurality of fins are arranged in parallel so that the planes of adjacent fins face each other. In FIG. 14, the plurality of fins are illustrated as the fin assembly 3. In the plurality of fins, a U-shaped notch is formed in one side of the pair of side end portions extending in the longitudinal direction along the short direction of the fin. The hairpin tube 1 is press-fitted into U-shaped notches of a plurality of fins. In the eighth embodiment, one of the U-bent hairpin tubes 1 is arranged so as to straddle the heat exchanger core 281 and the heat exchanger core 282. That is, of the pair of pipe portions extending in the lateral direction of the flat tube heat exchanger 108 of the hairpin tube, one pipe portion is in the position closest to the end face facing the heat exchanger core 282 in the heat exchanger core 281. The other pipe part is arranged in the heat exchanger core 282 at a position closest to the end face facing the heat exchanger core 281. The hairpin tube 1 is arranged so as to connect the heat exchanger core 281 and the heat exchanger core 282. The brazing sheet 7 is inserted between the heat exchanger core 281 and the heat exchanger core 282. The heat exchanger core 281 and the heat exchanger core 282 are joined by the brazing sheet 7.

  When two heat exchanger cores are connected to form a flat tube heat exchanger, the strength of the joint location of the two heat exchanger cores is weaker than other locations. When a load is applied to the flat tube heat exchanger, there is a concern that the flat tube heat exchanger may be cut at the joint portion of the heat exchanger core. According to the eighth embodiment, the header 5 is connected to the cut portion side of the hairpin tube 1, and the hairpin side straddles the heat exchanger core 281 and the heat exchanger core 282. Therefore, the strength of the joint portion between the heat exchanger core 281 and the heat exchanger core 282 is further increased. Further, there is no need to provide a member for increasing the strength of the joint location. Therefore, it is possible to increase the strength of the joint portion while suppressing an increase in the number of parts. As described above, according to the eighth embodiment, it is possible to improve the assembling property and suppress the manufacturing cost while increasing the strength of the joint portion between the two heat exchanger cores.

Embodiment 9 FIG.
FIG. 15 is a diagram showing a flat tube heat exchanger according to Embodiment 9 of the present invention. FIG. 15 is an overall view of the flat tube heat exchanger 109 and shows a state before being bent into a U-shape. The flat tube heat exchanger 109 has a heat exchanger core 291 and a heat exchanger core 292. The heat exchanger core 291 and the heat exchanger core 292 are juxtaposed in the step direction. The heat exchanger core 291 and the heat exchanger core 292 have a plurality of fins. The plurality of fins are arranged in parallel so that the planes of adjacent fins face each other. In FIG. 15, the plurality of fins are illustrated as the fin assembly 3. In the plurality of fins, a U-shaped notch is formed in one side of the pair of side end portions extending in the longitudinal direction along the short direction of the fin. The flat tube 15 is press-fitted into U-shaped notches of a plurality of fins. In the ninth embodiment, one cut portion of the flat tube 15 is connected by the header 5, and the other cut portion is also connected by the header 5. That is, both ends of the flat tube 15 are connected by the header 5.

  As described above, when a flat tube heat exchanger is configured by connecting two heat exchanger cores, the strength of the joint location of the two heat exchanger cores is weaker than other locations. According to the ninth embodiment, since both ends of the hairpin tube 1 are connected to each other by the header 5, the strength of the joint portion between the heat exchanger core 291 and the heat exchanger core 292 can be increased.

  Although Embodiments 1 to 9 have been described by taking, as an example, a configuration in which two heat exchanger cores are juxtaposed in the step direction and joined, the present invention is not limited to this. Three or more heat exchanger cores may be juxtaposed in the step direction, and adjacent heat exchanger cores may be joined.

  According to the present invention, since a plurality of heat exchanger cores are juxtaposed in the stage direction, even if each heat exchanger core is small, a large flat tube heat exchanger as a whole can be configured. By reducing the size of the heat exchanger core, the heat exchanger core manufacturing apparatus can be reduced in size, and capital investment can be suppressed. Further, by adjusting the number of heat exchanger cores juxtaposed in the stage direction, flat tube heat exchangers of various sizes can be easily manufactured.

Embodiment 10 FIG.
Next, the manufacturing method of a flat tube heat exchanger is demonstrated. As described above, the flat tube heat exchanger 101 includes the heat exchanger core 11, the heat exchanger core 12, a joint (not shown) that connects the flat tube and the circular tube, the header 5, and the distributor 6. . The heat exchanger cores 11 and 12 include a hairpin tube 1 and a plurality of fins 2 formed by bending a flat tube.

  As a manufacturing method of the heat exchanger core, there are the following methods. The fins of the heat exchanger core are cut out from a thin metal plate having a high thermal conductivity, such as an aluminum thin plate. For example, fins are created by continuously feeding a material with a progressive die in which a coil material made of an aluminum thin plate is loaded on a high-speed press and press-molding the material. Some fins are provided with a fin collar cut and raised on the surface in contact with the flat tube in order to improve the bondability with the flat tube. The flat tube is made of a metal having a high thermal conductivity such as aluminum or copper. A hairpin tube is created by rolling a flat tube wound around a bobbin into a coil shape, adjusting the shape by straightening, cutting the tube into a predetermined length, and performing bending.

  The press-shaped fins are cut to a predetermined length and stacked. A heat exchanger core is manufactured by press-fitting a flat tube or a hairpin tube subjected to bending into the U-shaped notch of the laminated fins.

  As a method for manufacturing the heat exchanger core, there are the following methods different from the above-described press-fitting method. FIG. 16 is a diagram illustrating one process of manufacturing a heat exchanger core according to Embodiment 10 of the present invention. As shown in FIG. 16, the fins 2 are cut one by one from the plate material 20 that is stacked on a high-speed press, continuously fed with a progressive die, and press-shaped. Then, a plurality of the hairpin tubes 1 are arranged, and the fins 2 are inserted one by one into the arranged hairpin tubes 1 so that the hairpin tubes 1 are arranged in the notches of the fins 2. Thereby, the fin 2 is arrange | positioned so that a plane may oppose. In addition, you may use the straight flat tube which is not implementing the bending process instead of the hairpin tube 1 which bent the flat tube.

  Next, the flat tube, that is, the hairpin tube 1 and the fin 2 are joined by brazing. In the case of the flat tube heat exchanger according to Embodiment 1, the material configuration of the fins 2 is as described with reference to FIGS. When the clad material having the core material 2a and the brazing material 2b is used for the fins 211 and 212 as in the cases of FIGS. 5B, 5C and 5E, the hairpin tube 1 and the fin 211 are made by the brazing material 2b. 212 are brazed. When the bare material of only the core material 2a is used for the fins 211 and 212 as in the case of FIGS. 5A and 5D, and the hairpin tube 1 has a brazing material layer, the hairpin tube 1 The hairpin tube 1 and the fin 2 are brazed and joined by the brazing material. As in the case of FIGS. 5A and 5D, when the bare material having only the core material 2a is used for the fins 211 and 212, and the hairpin tube 1 does not have the brazing material layer, the brazing material is placed. By supplying, the hairpin tube 1 and the fin 2 are brazed and joined. The brazing of the hairpin tube 1 and the fin 2 is performed by brazing in a furnace that is put into a high-temperature atmosphere furnace.

  In the case of the flat tube heat exchanger according to the second embodiment, the material configuration of the fin 2 is as described with reference to FIGS. It is the same as that of the case of the flat tube heat exchanger which concerns on form 1.

  FIG. 17 is a diagram illustrating one process of manufacturing a flat tube heat exchanger. A plurality of heat exchanger cores are created as described above, and a flat tube heat exchanger is assembled by juxtaposing them. In the example shown in FIG. 17, two heat exchanger cores, that is, the heat exchanger core 11 and the heat exchanger core 12 are juxtaposed. In the tenth embodiment, the heat exchanger core 11 and the heat exchanger core 12 are crossed with the direction of the notch of the fin 2 where the hairpin tube 1 is arranged, and the direction along the plane of the fin 2, that is, the step Juxtapose in the direction. This juxtaposition process may be performed before the brazing joining of the hairpin tube 1 and the fin 2.

  After the heat exchanger core 11 and the heat exchanger core 12 are juxtaposed in the step direction, the brazing sheet 7 is then inserted between the heat exchanger core 11 and the heat exchanger core 12 to assemble the flat tube heat exchanger 101. . The assembly of the flat tube heat exchanger 101 is performed on a work table or a carriage. When inserting the brazing sheet 7, adjustment of the relative positional relationship between the hairpin tube 1, the fin 2, and the brazing sheet 7 and the fixing of these members may be performed using a jig.

  After assembling the flat tube heat exchanger, the components that connect the cut portions of the hairpin tube 1 are connected. The parts to be connected include, for example, a U bend that connects a pair of heat transfer tubes, a header that connects each heat transfer tube from a main flow path, and a distributor. A member called a joint that converts the flow path from the circular tube to the flat tube may be used when connecting the cut portion of the hairpin tube 1 to the U bend, the circular tube, the header, and the distributor.

  By putting the flat tube heat exchanger 101 assembled as described above into a high-temperature atmosphere furnace, the heat exchanger core 11 and the heat exchanger core 12 are brazed via the brazing sheet 7, and the flat tube A heat exchanger 101 is created. When the flat tube heat exchanger 101 is assembled before the hairpin tube 1 and the fin 2 are brazed, when the heat exchanger core 11 and the heat exchanger core 12 are brazed, the hairpin tube 1 and the fin 2 Brazing joining is performed.

  In the case of the flat tube heat exchanger according to the first embodiment, the material of the brazing sheet 7 is as described with reference to FIGS. When brazing material 7b is used for brazing sheet 7 as in FIGS. 5 (a) and 5 (b), brazing sheet 7 melts after being put into the high-temperature atmosphere furnace, so in flat tube heat exchanger 101, The brazing sheet 7 does not constitute a single layer. When using the bare material of only the core material 7a for the brazing sheet 7 as in the case of FIG. 5C, the brazing material is supplied from the brazing material 2b of the fin 2 after being put into the high temperature atmosphere furnace. After brazing and joining, in the flat tube heat exchanger 101, the brazing sheet 7 constitutes a single layer. As shown in FIGS. 5D and 5E, when a clad material is used for the brazing sheet 7, the core material 7a remains after being put into the high-temperature atmosphere furnace. Therefore, after brazing and joining, in the flat tube heat exchanger 101, the brazing sheet 7 constitutes a single layer.

  In the case of the flat tube heat exchanger according to the second embodiment, the material structure of the brazing sheet 7 is as described with reference to FIGS. 7A to 7E, and the brazing sheet 7 after brazing and joining. This aspect is the same as that of the flat tube heat exchanger according to the first embodiment.

  In the case of the flat tube heat exchanger according to Embodiment 5, the brazing sheet 7 shown in FIG. 10 is composed only of brazing material. Therefore, since the brazing sheet 7 melts after being put into the high-temperature atmosphere furnace, the brazing sheet 7 does not form a single layer in the flat tube heat exchanger 101.

  The U-bend, header, distributor, and the joint and the hairpin tube 1 are joined by putting them into a high-temperature atmosphere furnace.

  FIG. 18 is a diagram illustrating one process of manufacturing a flat tube heat exchanger. As shown in FIG. 18, a flat tube heat exchanger may be assembled by stacking a plurality of structures including the heat exchanger core 11, the heat exchanger core 12, and the brazing sheet 7 that are juxtaposed in the step direction. These structures are stacked along a row direction that is orthogonal to the step direction and parallel to the planar direction of the fins 2.

  In the first row, the heat exchanger core 11 and the heat exchanger core 12 are juxtaposed in the step direction, and the brazing sheet 7 is inserted between the heat exchanger core 11 and the heat exchanger core 12. Similarly, in the second row, the heat exchanger core 11 and the heat exchanger core 12 are juxtaposed in the step direction, and the brazing sheet 7 is inserted between the heat exchanger core 11 and the heat exchanger core 12, A structure. Then, this structure is put into a high-temperature atmosphere furnace. In order to prevent the first-row heat exchanger core and the second-row heat exchanger core from being bonded to each other, a bonding preventing sheet 30 for preventing bonding is inserted between them. When manufacturing a flat tube heat exchanger by brazing in a furnace, a sheet using, for example, carbon fiber is used as a sheet for preventing joining.

  When the above-mentioned two rows of structures are put into a high-temperature atmosphere furnace, a jig may be used to adjust and fix the relative positional relationship between the hairpin tube 1, the fins 2, and the brazing sheet 7.

  The parts that connect the cut portions of the hairpin tube 1 may be brazed together with the heat exchanger cores by brazing in a furnace, or a burner that burns the base material and the brazing material with a flame. It may be brazed by brazing or high-frequency brazing.

  As described above, according to the tenth embodiment, in the manufacture of a flat tube heat exchanger, the heat exchanger cores 11 and 12 intersect the step direction, that is, the direction of the notch of the fin, and on the plane of the fin. Juxtaposing in the direction along and joining the juxtaposed heat exchanger cores. Therefore, in the production of the flat tube heat exchanger, the occurrence of a shift in the relative positional relationship between adjacent heat exchanger cores is suppressed.

  1 hairpin tube, 2 fins, 2a core material, 2b brazing material, 3 fin assembly, 4 connecting member, 5 header, 6 distributor, 7 brazing sheet, 7a core material, 7b brazing material, 8 fin collar, 9 spacer block, 10 heat exchanger core, 11 heat exchanger core, 12 heat exchanger core, 15 flat tube, 20 plate material, 30 joint prevention sheet, 51 upper front panel, 52 lower front panel, 53 left side panel, 54 fan guard, 55 Air outlet, 56 Base panel, 57 Compressor, 58 Accumulator, 59 Air inlet, 100 Flat tube heat exchanger, 101 Flat tube heat exchanger, 107 Flat tube heat exchanger, 108 Flat tube heat exchanger, 109 Flat Tube heat exchanger, 111 heat exchanger core, 112 heat exchanger core, 122 heat exchanger core , 200 Outdoor unit, 211 fin, 212 fin, 221 fin, 222 fin, 231 fin, 232 fin, 241 fin, 242 fin, 251 fin, 252 fin, 261 fin, 262 fin, 271 fin, 272 fin, 281 Heat exchange Heat exchanger core, 282 heat exchanger core, 291 heat exchanger core, 292 heat exchanger core, 311 heat exchanger core, 312 heat exchanger core, 411 heat exchanger core, 412 heat exchanger core, 511 heat exchanger core 512 heat exchanger core, 611 heat exchanger core, 612 heat exchanger core, 711 heat exchanger core, 712 heat exchanger core.

The heat exchanger according to the present invention is a heat exchanger provided with a plurality of heat exchanger cores having a plurality of flat fins formed with notches and a plurality of heat transfer tubes. is arranged to, the heat transfer tube, the are arranged in the notch of the fins to extend in a direction intersecting the plane of the fins, a plurality of the heat exchanger core, the notch but the fin The heat exchanger cores that are adjacent to each other and that are juxtaposed in a direction that intersects the direction along the plane of the fin and that is along the plane of the fins are brazed .

Moreover, the manufacturing method of the heat exchanger which concerns on this invention is the manufacturing method of the heat exchanger provided with two or more heat exchanger cores which have several flat fin and the several heat exchanger tube in which the notch is formed. Forming the heat exchanger core disposed in the notches of the fins such that the fins are disposed so that the planes face each other, and the heat transfer tube extends in a direction intersecting the plane of the fins; a plurality of the heat exchanger core, the notch is to intersect the direction in which along with respect to the fin, and a step of juxtaposing in a direction along the plane of the fin, brazing the heat exchanger core adjacent And joining by attaching .

Claims (15)

In a heat exchanger comprising a plurality of heat exchanger cores having a plurality of flat fins and a plurality of heat transfer tubes in which notches are formed,
The fins are disposed so that the planes face each other, and the heat transfer tubes are disposed in the notches of the fins so as to extend in a direction intersecting the planes of the fins.
The plurality of heat exchanger cores are juxtaposed in a direction that intersects the direction of the notch and along the plane of the fins, and the adjacent heat exchanger cores are joined together.   The heat exchanger according to claim 1, wherein the adjacent heat exchanger cores are brazed.   The heat exchanger according to claim 2, further comprising a brazing sheet disposed between the adjacent heat exchanger cores, wherein the adjacent heat exchanger cores are brazed and joined by the brazing sheet.   The heat exchanger according to claim 3, wherein at least one of the fin and the brazing sheet includes a brazing material.   The heat exchanger according to claim 2, wherein the fin includes a core material and the brazing material.   The bending process is given to the end surface facing the said other heat exchanger core in the said fin of the said heat exchanger core of at least one of the said adjacent heat exchanger cores. The heat exchanger according to one item.   6. The heat transfer tube according to claim 1, wherein, in the fin of at least one of the adjacent heat exchanger cores, the heat transfer tube is exposed at an end surface facing the other heat exchanger core. A heat exchanger according to claim 1.   The metal block member is arrange | positioned between the said adjacent heat exchanger cores, The said adjacent said heat exchanger core is joined via the said block member, Claim 7 which quotes 2-5. The heat exchanger as described in.   Each of the plurality of heat transfer tubes is a hairpin tube bent in a U-shape, and one of the hairpin tubes is one of the pair of tube portions extending in the lateral direction of the heat exchanger. In one of the heat exchanger cores of the exchanger core, the heat exchanger core is located on an end surface facing the other heat exchanger core, and the other pipe portion of the pair of pipe portions is the second heat exchanger core in the other heat exchanger core. The heat exchanger as described in any one of Claims 1-6 arrange | positioned so that it may be located in the end surface facing one said heat exchanger core.   The heat exchanger according to any one of claims 1 to 8, wherein both end portions of the plurality of heat transfer tubes are connected by headers.   The air conditioner provided with the heat exchanger as described in any one of Claims 1-10. In a method of manufacturing a heat exchanger comprising a plurality of heat exchanger cores having a plurality of flat fins and a plurality of heat transfer tubes in which notches are formed,
Forming the heat exchanger core disposed in the notches of the fins such that the fins are disposed so that the planes face each other, and the heat transfer tube extends in a direction intersecting the plane of the fins;
Juxtaposing the plurality of heat exchanger cores in a direction intersecting the direction of the notches and along the plane of the fins;
Joining the adjacent heat exchanger cores. A method of manufacturing a heat exchanger.   The manufacturing method of the heat exchanger according to claim 12, wherein in the joining step, the adjacent heat exchanger cores are joined by brazing.   The method for producing a heat exchanger according to claim 13, wherein a brazing sheet is used for joining by brazing.   The method for manufacturing a heat exchanger according to claim 14, wherein the brazing sheet is composed only of a brazing material.

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