JP6136124B2 - Heat exchanger manufacturing method and heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger manufacturing method and a heat exchanger, and more particularly to a heat exchanger manufacturing method and a heat exchanger having flat heat transfer tubes.

  A heat exchanger provided in an air conditioner, a refrigeration apparatus, or the like is composed of a heat transfer tube formed of copper, aluminum, aluminum alloy, etc. and a refrigerant flowing inside, and a heat transfer tube formed of aluminum, aluminum alloy, etc. in a plate shape. Some include a plurality of fins arranged at predetermined intervals along the longitudinal direction. And, as an example of the shape of such a heat exchanger, flat heat transfer tubes having a plurality of refrigerant flow paths inside are arranged in multiple stages in the vertical direction, and both ends are connected to the flat surface of the flat heat transfer tubes so that the flat heat transfer tubes There is known a PFC (Parallel Flow Type Heat Exchanger) configured to include a plurality of fins arranged so as to be substantially orthogonal to the longitudinal direction.

  Specifically, the PFC is interposed between a pair of header pipes, a plurality of flat heat transfer pipes whose both ends are connected to each header pipe and are parallel to each other in the vertical direction, and the flat heat transfer pipes. Arranged so as to be approximately orthogonal to the longitudinal direction of the flat heat transfer tube, and connected at one end to the upper surface side of the uppermost flat heat transfer tube and the lower surface side of the lowermost flat heat transfer tube, and approximately orthogonal to the longitudinal direction of the flat heat transfer tube A plurality of corrugated fins, and a pair of side plates that are connected to the upper surface of the uppermost fin and the lower surface of the lowermost fin and are connected to the header pipes at both ends. Yes. These header pipes, flat heat transfer tubes, fins, and side plates are all formed of aluminum or an aluminum alloy, and are brazed to each other and fixed.

  The PFC is configured so that the flat heat transfer tube is substantially orthogonal to the flow of air taken into the housing of the air conditioner or the refrigeration apparatus by the rotation of the fan provided in the air conditioner or the refrigeration apparatus. It arrange | positions inside the housing of an air conditioner or a freezing apparatus so that the flat surface (plane part) of a heat exchanger tube may become substantially parallel with respect to the flow of air. Therefore, the fins arranged so as to be substantially orthogonal to the longitudinal direction of the flat heat transfer tube are also substantially parallel to the air flow inside the housing.

  When the PFC described above functions as an evaporator, water vapor in the air condenses on the surface of the fins to generate condensed water, and the generated amount becomes large depending on the outside air temperature and humidity. If this condensate stays in a large amount in the flat portion of the flat heat transfer tube, the condensate condensate may become a draft resistance or hinder heat exchange between the air and the refrigerant, which may reduce the heat exchange efficiency. . Therefore, it is desirable that the generated condensed water is drained from the PFC as soon as possible.

  Therefore, in Patent Document 1, the flat portion of the flat heat transfer tube is inclined with respect to the horizontal direction by bending the intermediate portion of the flat heat transfer tube into an inverted V shape, and the flat heat transfer tube is connected to the header pipe. A PFC has been proposed in which water guide plates are provided near both ends, that is, at both ends of a flat heat transfer tube whose height is lower than that of the intermediate portion. The condensed water generated when this PFC functions as an evaporator flows toward both ends of the flat heat transfer tube without staying in the flat portion due to the inclination provided in the flat heat transfer tube, and the both ends of the flat heat transfer tube. Condensed water that reaches the section falls along the water guide plate and falls below the PFC due to gravity. As described above, since the condensed water generated in the PFC is quickly drained from the PFC, it is possible to reduce a decrease in heat exchange efficiency due to retention of the condensed water.

JP-A-8-334277 (pages 3, 4 and 1)

  As a method for manufacturing a PFC having a bent flat heat transfer tube as described in Patent Document 1, the following is usually performed. First, aluminum or an aluminum alloy is formed into a flat cross section by extrusion or drawing, and then bent using a bender or the like to create a flat heat transfer tube. Next, both ends of the flat heat transfer tube are connected to the header pipe, and fins are inserted between the flat heat transfer tubes. And this state is hold | maintained using a jig etc., it puts into a welding furnace, brazing is performed, and PFC is completed.

  On the other hand, in PFC, in order to ensure heat conduction between the fin and the flat heat transfer tube, the upper and lower portions of the fin (for example, corrugated fins, the top and bottom of the corrugated shape) are surely connected to the flat portion of the flat heat transfer tube. It is desirable to braze in the state which contacted. However, in the PFC manufacturing method as described above, the fin is inserted so as to follow the shape of the bent flat heat transfer tube, and the shape of the fin does not follow the shape of the bent portion of the flat heat transfer tube. In addition, there is a possibility that a gap is generated between the lower portion and the bent portion of the flat heat transfer tube. This problem may occur as the number of times the flat heat transfer tube is bent increases, and the heat exchange efficiency in the PFC may be greatly reduced.

  The present invention solves the above-described problems, and provides a heat exchanger manufacturing method and a heat exchanger that can reliably contact a fin and a flat heat transfer tube even if the flat heat transfer tube is bent. The purpose is to do.

  In order to solve the above problems, a method of manufacturing a heat exchanger according to the present invention includes a pair of headers, a plurality of flat heat transfer tubes connected at both ends to the header and arranged in parallel in the vertical direction, and a flat transfer A plurality of fins arranged between the heat pipes and the outer surfaces of the uppermost and lowermost flat heat transfer tubes, and the upper part of the fins arranged at the uppermost stage and the lower part of the fins arranged at the lowermost stage, respectively. A heat exchanger including a pair of side plates disposed in a connecting step of connecting a flat heat transfer tube and a side plate to a header, and fins between the flat heat transfer tubes and the flat heat transfer tubes A fin insertion process for interposing between the plate and the side plate, a welding process for welding the header, the flat heat transfer tube, the fin and the side plate to each other, and the flat heat transfer tube In the direction fine side plates from one end to the other it is intended to include a step bending bending at least one location as the same position.

  The heat exchanger of the present invention produced by the above manufacturing method is a pair of headers, both ends of which are connected to the headers, arranged parallel to each other in the vertical direction, and bent in the vertical direction from one end to the other end. A plurality of flat heat transfer tubes provided with at least one mountain fold portion and at least a pair of valley fold portions, a plurality of flat heat transfer tubes, and a plurality of flat heat transfer tubes disposed between the flat heat transfer tubes and the outer surfaces of the uppermost and lowermost flat heat transfer tubes And a pair of side plates arranged so as to be in contact with the upper part of the fin arranged at the uppermost stage and the lower part of the fin arranged at the lowermost stage, respectively. The fins are corrugated fins that are bent into a plurality of shapes and are corrugated, and the folding pitch of the fins corresponding to the valley folds and the mountain folds in the flat heat transfer tube and the side plate is the same as that of the fins in other locations. It is formed larger than the bending pitch.

  According to the method for manufacturing a heat exchanger of the present invention configured as described above, the flat heat transfer tubes and the side plates are bent after the respective members constituting the heat exchanger are welded. Thereby, a heat exchanger can be manufactured so that the upper part and lower part of a fin, and a flat heat exchanger tube can be made reliably, and the heat exchanger which can suppress the fall of heat exchange efficiency can be provided. In addition, since the folding pitch of the fins corresponding to the mountain folds and valley folds formed by folding is larger than the folding pitch of other parts, the folding process is easier and the fin Deformation and breakage are less likely to occur.

It is explanatory drawing of PFC which is an Example of this invention, (A) is a front view, (B) is the P section enlarged view in (A). It is explanatory drawing of the bending jig which bends a heat exchanger in the Example of this invention, (A) is schematic, (B) is the state figure which the movable part moved. It is explanatory drawing of the bending process of the heat exchanger by a bending jig, (A) is the state figure which set the heat exchanger to the bending jig, (B) is explanatory drawing at the time of performing a bending process.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an example, a PFC provided in an outdoor unit of an air conditioner will be described as an example. The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

  As shown in FIG. 1A, the heat exchanger 1 in this embodiment includes a pair of header pipes 2 and 3, a plurality (10 in this embodiment) of flat heat transfer tubes 4, and a plurality ( In this embodiment, the fin 5 is composed of 11 fins 5, a pair of side plates 6, and a plurality of (8 in this embodiment) water guide members 7.

  The header pipes 2 and 3 are formed in a substantially cylindrical shape by extrusion molding or the like of aluminum or an aluminum alloy (hereinafter collectively referred to as an aluminum material), and upper and lower ends thereof are closed by cap members. ing. In addition, a refrigerant inlet 2a that is an inlet of a high-pressure gas refrigerant discharged from a compressor (not shown) is provided in the vicinity of the upper end on the outer side of one header pipe 2 (left side in FIG. 1A). In the vicinity of the lower end on the outer side of the other header pipe 3 (on the right side in FIG. 1A), the heat exchanger 1 exchanges heat with air to cause the refrigerant that has become high-pressure liquid refrigerant to flow out. A refrigerant outlet 3a is provided.

  The flat heat transfer tube 4 is formed to have a flat cross-sectional shape by extruding or drawing an aluminum material. As shown in FIG. 1 (A), the flat heat transfer tube 4 is formed into a waveform from one end to the other end by a bending process after assembly of the heat exchanger 1 to be described later. The flat heat transfer tube 4 is bent so that the mountain fold 4d and the valley fold 4b are repeated in order toward the center with the connection to 3 as the base 4c. Thereby, between the base part 4c or the valley fold part 4b, and the mountain fold part 4d becomes the inclined surface 4e inclined at a predetermined angle. Here, the mountain fold portion 4d indicates a portion where the flat heat transfer tube 4 is bent above the straight line connecting the base portions 4c, and the valley fold portion 4b is substantially the same height as the straight line connecting the base portions 4c. It is assumed that the flat heat transfer tube 4 is bent.

  As shown in FIG. 1B, the upper surface side of the base portion 4c and the valley fold portion 4b described above is an upper surface contact portion 4g with which a pressing pin 84 of a bending jig 80 described later contacts. Further, the lower surface side of the mountain fold portion 4d is a lower surface contact portion 4f with which the bending pin 83 of the bending jig 80 contacts. Moreover, in the side edge part 4h used as the front edge or the rear edge of the flat heat exchanger tube 4 surface mentioned later, in the location corresponding to each base part 4c and each valley fold part 4b, for attaching the water guide member 7 mentioned later A recess 4a is provided. The air flow described above is generated by the rotation of an outdoor fan (not shown) disposed in the vicinity of the heat exchanger 1.

  The flat heat transfer tubes 4 are arranged in a plurality of stages so as to be parallel to each other vertically. Thereby, as shown to FIG. 1 (A), the recessed part 4a mentioned above is located in a line with the up-down direction. In addition, a plurality of refrigerant flow paths (not shown) are formed in the flat heat transfer tubes 4 along the longitudinal direction of the flat heat transfer tubes (the left-right direction in FIG. 1A), and both ends of the flat heat transfer tubes 4 are The header pipes 2 and 3 are connected to the header pipes 2 and 3 so as to communicate with each other.

  The fins 5 are corrugated fins formed by bending a plate material made of an aluminum material into a waveform. As shown in FIG. 1A, the length dimension of the fin 5 is substantially the same as the dimension in the longitudinal direction of the flat heat transfer tube 4, and the width dimension of the fin 5 is the same as the width dimension of the flat heat transfer tube 4 or Slightly smaller dimensions. Moreover, the part corresponding to the mountain fold part 4d and the valley fold part 4b of the flat heat exchanger tube 4 in the fin 5 is made into the jig insertion part 5a which made the bending pitch larger to make a corrugated shape compared with another part. The fins 5 are arranged along the shape of the flat heat transfer tubes 4 on the surfaces of the flat heat transfer tubes 4 (surfaces forming the valley folds 4b, the mountain folds 4d, and the inclined surfaces 4e). The four valley folds 4b, the mountain folds 4d, and the inclined surfaces 4e are joined to the corrugated tops of the fins 5 (upper and lower parts of the fins 5) by brazing, which will be described later.

  The side plate 6 is formed to have the same width as that of the flat heat transfer tube 4 by punching a plate material made of an aluminum material. The side plate 6 is bent in the same manner as the flat heat transfer tube 4 at the same time as the flat heat transfer tube 4 by a bending process performed after assembling the heat exchanger 1 described later. The side plate 6 is bent so that the mountain fold 63 and the valley fold 61 are repeated in order toward the center as the base 62. Thus, an inclined surface 64 inclined at a predetermined angle is formed between the base portion 62 or the valley fold portion 61 and the mountain fold portion 63. Here, the mountain fold 63 indicates a portion where the side plate 6 is bent above the straight line connecting the bases 62, and the valley fold 61 is substantially the same height as the straight line connecting the bases 63. It is assumed that the side plate 6 is bent.

  As shown in FIG. 1B, the upper surface side of the base portion 62 and the valley fold portion 61 described above is an upper surface contact portion 66 on which a pressing pin 84 of a bending jig 80 described later contacts. Further, the lower surface side of the mountain fold 63 is a lower surface contact portion 65 with which the bending pin 83 of the bending jig 80 contacts.

  In the side plate 6, the tip of the base portion 62 has an arc shape corresponding to the cylindrical shape of the header pipes 2 and 3, and the tip is joined to the header pipes 2 and 3, and the side plate 6 Each surface (the surface forming the valley fold 61, the mountain fold 63, and the inclined surface 64) is disposed so as to contact the uppermost and lowermost fins 5. Moreover, in the side edge part 67 used as the front edge or the rear edge of the side plate 6 surface, the notch part 60 for attaching the water guide member 7 mentioned later to the location corresponding to each base part 62 and each valley fold part 61. Is provided. The air flow described above is generated by the rotation of an outdoor fan (not shown) disposed in the vicinity of the heat exchanger 1. 1A, when the side plate 6 is joined to the header pipes 2 and 3, the notch 60 is located at the same position in the left-right direction as the recess 4a provided in the flat heat transfer tube 4. It is provided to become.

  The water guide member 7 is made of an aluminum material, and the cross section thereof has a substantially circular shape corresponding to the size of the concave portion 4 a of the flat heat transfer tube 4 and the cutout portion 60 of the side plate 6, and the length thereof is between the upper and lower side plates 6. It is formed a little longer than the dimension. As shown in FIG. 1A, the water guide member 7 has one end of the water guide member 7 protruding from the upper surface of the upper side plate 6 into the recess 4 a of the flat heat transfer tube 4 and the cutout portion 60 of the upper and lower side plates 6. It installs so that the other end of the water guide member 7 may protrude from the lower surface of the lower side plate 6.

  A brazing material layer made of an aluminum material having a melting point lower than that of the aluminum material forming the main body is provided on each surface of the header pipes 2 and 3, the fins 5, and the water guide member 7. Specifically, the header pipe 2 is formed by using a brazing material in which a brazing material (for example, Al-Si) having a lower melting point is clad on the surface of an aluminum material (for example, A3000 or A1000 (JIS)). 3, fins 5, and water guide members 7 are formed. At this time, the flat heat transfer tubes 4 and the side plates 6 without the brazing material layer are also formed of an aluminum material such as A3000 series or A1000 series (JIS).

  Next, the connection state between the header pipes 2 and 3 and the flat heat transfer tubes 4 and the flow of the refrigerant in the heat exchanger 1 will be described with reference to FIG. First, the connection state between the header pipes 2 and 3 and the flat heat transfer tubes 4 will be described. As shown in FIG. 1A, the inside of the header pipe 2 is divided into two chambers, an upper chamber 2c and a lower chamber 2d, by a partition plate 2b, and a refrigerant inlet 2a is provided in the upper chamber 2c. The header pipe 3 is also divided into two chambers, an upper chamber 3c and a lower chamber 3d, by a partition plate 3b, and a refrigerant outlet 3a is provided in the lower chamber 3d.

  Ten flat heat transfer tubes 4 are divided as follows by the partition plates 2b and 3b provided in the header pipes 2 and 3, respectively. First, the five flat heat transfer tubes 4 including the uppermost flat heat transfer tubes 4 and disposed below the flat heat transfer tubes 4 are defined as a pipe line group X. One end of the flat heat transfer tube 4 constituting the pipe line group X is connected to the upper chamber 2 c of the header pipe 2, and the other end is connected to the upper chamber 3 c of the header pipe 3.

  Further, the three flat heat transfer tubes 4 arranged below the pipe group X are referred to as a pipe group Y. One end of the flat heat transfer tube 4 constituting the pipe line group Y is connected to the upper chamber 3 c of the header pipe 3, and the other end is connected to the lower chamber 2 d of the header pipe 2. Further, the two flat heat transfer tubes 4 arranged below the pipe group Y are defined as a pipe group Z. One end of the flat heat transfer tube 4 constituting the pipe line group Z is connected to the lower chamber 2 d of the header pipe 2, and the other end is connected to the lower chamber 3 d of the header pipe 3.

  Next, the flow of the refrigerant in the heat exchanger 1 will be described. Here, the case where the heat exchanger 1 functions as a condenser will be described as an example. The high-pressure gas refrigerant discharged from the compressor flows through the refrigerant circuit and flows into the upper chamber 2c of the header pipe 2 from the refrigerant inlet 2a. The refrigerant that has flowed into the upper chamber 2 c of the header pipe 2 flows through the pipe line group X and flows into the upper chamber 3 c of the header pipe 3. The refrigerant flowing into the upper chamber 3 c of the header pipe 3 flows through the pipe line group Y and flows into the lower chamber 2 d of the header pipe 2. The refrigerant flowing into the lower chamber 2d of the header pipe 2 flows through the duct group Z and flows into the lower chamber 3d of the header pipe 3. Then, the refrigerant flowing into the lower chamber 3d of the header pipe 3 flows out from the refrigerant outlet 3a to the refrigerant circuit.

  As described above, the refrigerant flows through the heat exchanger 1 to exchange heat between the refrigerant and air, and the refrigerant flowing into the heat exchanger 1 in a high-pressure gas state becomes a high-pressure liquid refrigerant. Flows out of 1. In FIG. 1, the above-described refrigerant flow is indicated by arrows. Further, the flow of the refrigerant when the heat exchanger 1 functions as an evaporator is opposite to that when the heat exchanger 1 functions as a condenser, and the refrigerant flowing in from the refrigerant outlet 3a flows in order from the lower chamber 3d → the pipe group Z → the lower It flows in the order of chamber 2d → pipeline group Y → upper chamber 3c → pipeline group X → upper chamber 2c and flows out from the refrigerant inlet 2a to the refrigerant circuit.

  Next, the assembly process of the heat exchanger 1 and the bending process after the assembly will be described with reference to FIGS. 1 to 3. In assembling the heat exchanger 1, first, the header pipes 2 and 3 are opposed to each other in parallel, and the flat heat transfer tubes 4 and the side plates 6 are arranged between the header pipes 2 and 3 and connected to the header pipes 2 and 3 (connection). Process). Specifically, the side plates 6 are arranged at the uppermost part and the lowermost part, and ten flat heat transfer tubes 4 are arranged in parallel therebetween.

  In addition, although illustration is abbreviate | omitted, the header pipes 2 and 3 are provided with the connection part which formed the hole corresponding to the cross-sectional shape of the flat heat exchanger tube 4 and the side plate 6, and as mentioned above, a flat heat exchanger tube By connecting both end portions of 4 to the connecting portion of the header pipes 2 and 3, the header pipe 2 and the header pipe 3 communicate with each other through the refrigerant flow path inside the flat heat transfer tube 4.

  Next, between each of the flat heat transfer tubes 4, between the upper side plate 6 and the flat heat transfer tube 4 disposed below the upper side plate 6, and between the lower side plate 6 and the flat heat transfer tube disposed thereon. The fins 5 are inserted between the two (fin insertion step). Next, the water guide member 7 is inserted into the recess 4 a of the flat heat transfer tube 4 and the cutout portions 60 of the upper and lower side plates 6.

  And the temporary assembly state of each structural member of the heat exchanger 1 combined mutually as mentioned above is hold | maintained using a jig etc. FIG. Thereby, temporary assembly of the heat exchanger 1 is completed, and the temporarily assembled heat exchanger 1 is conveyed into a welding furnace by a belt conveyor or the like. After conveying the heat exchanger 1 into the welding furnace, brazing of the heat exchanger 1 is started at a predetermined temperature (temperature at which the brazing material melts) (welding process). Specifically, the brazing material provided in the header pipes 2 and 3, the fins 5, and the water guide member 7 is melted to connect the header pipes 2 and 3, the flat heat transfer tubes 4 and the side plates 6, and the flat transmission. The brazing material flows through the joint portion between the heat pipe 4 and the side plate 6 and the fin 5, and the contact portion between the water guide member 7 and the recess 4 a of the flat heat transfer tube 4 and the cutout portion 60 of the side plate 6. And if the heat exchanger 1 is taken out from a welding furnace, a brazing material will solidify again with a temperature fall, each connection part, each contact part, and each junction part of the heat exchanger 1 will adhere, and the heat exchanger 1 will be fixed. Is completed, the state shown in FIG.

  Next, the heat exchanger 1 that has been assembled is bent into a state shown in FIG. 1 using a bending jig 80 shown in FIG. 2 (bending step). The bending jig 80 includes a movable portion 81 that is a three movable jigs having bending pins 83 that are a plurality of deformation jigs (second jigs), and a pressing pin 84 that is a plurality of pressing jigs (first jigs). And a fixing portion 82 which is a fixing jig. As shown in FIG. 2, three movable parts 81 are arranged between the four fixed parts 82.

  The movable portion 81 is slidably attached to the fixed portion 82 upward (arrow method in FIG. 2A), and FIG. 2B shows a state in which the movable portion 81 is slid upward. Show. Each of the movable parts 81 is provided with 2 rows × 12 stages and 24 bending pins 83, which are positioned below the flat heat transfer tubes 4 and the side plates 6 when the heat exchanger 1 is bent. Thus, each of the mountain folds 4d and the mountain folds 63 are formed.

In addition, the fixing portion 82 is provided with 2 rows × 12 stages and 24 holding pins 84 each. When the heat exchanger 1 is bent, the upper portion of the flat heat transfer tube 4 and the side plate 6 is provided. The valley folds 4b and the valley folds 61, and the bases 4c and 62 are formed at the positions.
In addition, about the width dimension of the movable part 81 and the fixing | fixed part 82, and the position of the bending direction of the bending pin 83 or the pressing pin 84, the position of the jig insertion part 5a of the fin 5, ie, the flat heat exchanger tube 4 and the side after the bending process. The plate 6 is defined corresponding to the positions of the valley fold 4b and valley fold 61, the base 4c and 62, the mountain fold 4d and the mountain fold 63.

  Next, the bending process of the heat exchanger 1 using the bending jig 80 will be specifically described. First, as shown in FIG. 3A, the heat exchanger 1 that has been brazed is set in a bending jig 80. At this time, the bending pin 83 of the movable portion 81 is in contact with a portion corresponding to the lower surface contact portion 4f and the lower surface contact portion 65 formed after the flat heat transfer tube 4 and the side plate 6 are bent, and the holding portion 82 is pressed. The pin 84 comes into contact with portions corresponding to the upper surface contact portion 4g and the upper surface contact portion 66 formed after the flat heat transfer tube 4 and the side plate 6 are bent.

  In addition, since the bending pitch of the part in which the bending pin 83 and the pressing pin 84 in the fin 5 are inserted is a jig insertion portion 5a which is larger than the bending pitch in other parts, it is compared with the case where the fin pitch is narrow. Thus, the possibility that the bending pin 83 and the pressing pin 84 hit the fin 5 to deform or damage the fin 5 is reduced.

  When the setting of the heat exchanger 1 to the bending jig 80 is completed, the three movable parts 81 are slid by a distance corresponding to an angle (an angle of the inclined surface 4e and the inclined surface 64) desired to be bent upward. At this time, since the portion of the flat heat transfer tube 4 and the side plate 6 where the pressing pin 84 of the fixing portion 82 is in contact is pressing the flat heat transfer tube 4 and the side plate 6, as shown in FIG. A portion of the heat transfer tube 4 and the side plate 6 where the bending pin 83 of the movable portion 81 is in contact causes the flat heat transfer tube 4 and the side plate 6 to bend upward.

  Through the above operation, the locations corresponding to the upper surface contact portion 4g and the upper surface contact portion 66 formed after the bending process are the valley fold portion 4b, the valley fold portion 61, the base portion of the flat heat transfer tube 4 and the side plate 6, respectively. 4c and 62, and portions corresponding to the lower surface contact portion 4f and the lower surface contact portion 65 formed after the bending work become the mountain fold portions 4d and the mountain fold portions 63 of the flat heat transfer tube 4 and the side plate 6, respectively.

  In addition, in the heat exchanger 1 of a present Example, it is a part corresponding to the place which becomes a folding part 4b and the valley folding part 61, the base part 4c and the base part 62, the mountain folding part 4d, and the mountain folding part 63 by bending. The jig insertion portion 5a has a larger pitch of the fins 5 than the pitch of the other portions. If the pitch of the fins 5 to be bent is the same as the pitch of the other parts, when the heat exchanger 1 is bent, stress may concentrate on the bent portions of the fins 5 and the fins 5 may be deformed or broken. However, if the jig insertion portion 5a is provided in the fin 5 as in the present embodiment, the heat exchanger 1 can be easily bent, and the deformation and breakage of the fin 5 due to the bending are less likely to occur. .

  As described above, the heat exchanger 1 of the present invention performs a bending process for providing a mountain fold portion or a valley fold portion on the flat heat transfer tube 4 or the side plate 6 after welding each member constituting the heat exchanger 1. Do. Therefore, the welding process can be performed in a state in which the flat heat transfer tubes 4 and the side plates 6 before bending are welded in a state where the fins 5 are flat and the flat heat transfer tubes 4 and the side plates 6 and the fins 5 are in contact with each other. In the bending process, the contact portion does not float or come off due to welding, so that a heat conduction loss between the flat heat transfer tube 4 and the fin 5 is small, and a decrease in heat exchange efficiency can be suppressed.

  In the embodiment described above, the case where each connection portion, contact portion, joint portion, and fitting portion of the heat exchanger 1 are fixed by the brazing material as the welding process is described, but the present invention is not limited to this. For example, each connection portion, contact portion, joint portion, and fitting portion of the heat exchanger 1 may be fixed using a thermosetting adhesive instead of the brazing material. Further, the side plate 6 is formed of a plate material made of an aluminum material. However, like the flat heat transfer tube 4, the side plate 6 may have a structure in which a coolant channel is provided inside by extrusion processing or drawing processing of the aluminum material.

  Further, in this embodiment, when the heat exchanger 1 is bent using the bending jig, the movable portion 81 is slid upward to form the mountain folded portion 4d and the mountain folded portion 63. Conversely, the jig corresponding to the location where the mountain fold portion 4d or the mountain fold portion 63 is to be formed is used as the fixing portion 83, and the jig corresponding to the location where the valley fold portion 4b and the valley fold portion 61, the base portion 4c and the base portion 62 are to be formed. The jig may be a movable portion 81, and the movable portion 81 may be slid to form the valley fold portion 4b, the valley fold portion 61, the base portion 4c, and the base portion 62.

  Further, the flat heat transfer tubes 4 and the side plates 6 include a mountain fold portion 4d, a mountain fold portion 63, a valley fold portion 4b, and a base portion 4c and a base portion 62 in the vicinity of the connection portion to the header pipes 2 and 3, respectively. Although the case where it bend | folds so that the valley fold part 61 may be repeated was demonstrated, the valley part 4b, the valley fold part 61, and the mountain fold part 4d in order toward the center part make the vicinity of the connection part to the header pipes 2 and 3 into the base part 62. And you may bend so that the mountain fold part 63 may be repeated.

  Furthermore, the case where the bending jig 80 is provided with the two folding pins 83 and the pressing pins 84 for forming the mountain folded portion 4d and the mountain folded portion 63, the valley folded portion 4b and the valley folded portion 61 has been described. However, the present invention is not limited to this, and if the mountain fold portion 4d and the mountain fold portion 63, the valley fold portion 4b and the valley fold portion 61 can be formed, the bending pins 83 and the pressing pins 84 are one or three or more. Also good.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Header pipe 2a Refrigerant inflow port 2b Partition plate 2c Upper chamber 2d Lower chamber 3 Header pipe 3a Refrigerant outflow port 3b Partition plate 3c Upper chamber 3d Lower chamber 4 Flat heat exchanger tube 4a Recess 4b Valley fold 4c Base 4d Mountain folded portion 4e Inclined surface 4g Upper surface contact portion 4f Lower surface contact portion 4h Side end portion 5 Fin 5a Jig insertion portion 6, 6a, 6b Side plate 7 Water guide member 10 Heat exchanger 60 Notch portion 60a Holding hole 61 Valley folding portion 62 Base part 63 Mountain folded part 64 Inclined surface 65 Upper surface contact part 66 Lower surface contact part 67 Side end part 80 Bending jig 81 Movable part 82 Fixed part 83 Bending pin 84 Holding pin X, Y, Z Pipe line group

Claims (3)

A pair of headers;
A plurality of flat heat transfer tubes, both ends of which are connected to the header and arranged parallel to each other in the vertical direction;
A plurality of fins disposed between each of the flat heat transfer tubes and on the outer surface of the uppermost and lowermost flat heat transfer tubes;
A pair of side plates disposed so as to be in contact with an upper portion of the fin disposed at the uppermost stage and a lower portion of the fin disposed at the lowermost stage;
A method of manufacturing a heat exchanger comprising:
A fin insertion step of interposing the fin between the flat heat transfer tubes and between the flat heat transfer tubes and the side plate;
A welding step of welding the flat heat transfer tubes, the fins, and the side plates to each other;
A bending step that is performed following the welding step, and that bends the flat heat transfer tube and the side plate at at least one location that is in the same position in the direction from one end to the other end , and
In the bending step,
The flat heat transfer tube and the side plate are bent between a fixed jig having a holding jig for pressing the flat heat transfer tube and the side plate, and a deformation jig for bending the flat heat transfer tube and the side plate. Being made by a bending jig made of a movable jig slidably arranged on
The manufacturing method of the heat exchanger characterized by these. It is a manufacturing method of the heat exchanger of Claim 1, Comprising:
Including a connecting step of connecting the flat heat transfer tube and the side plate to the header performed before the fin insertion step;
Welding the header, the flat heat transfer tube and the side plate in the welding step;
The manufacturing method of the heat exchanger characterized by these. A pair of headers;
The header is connected to both ends and arranged parallel to each other in the vertical direction, and is bent in the vertical direction from one end to the other end to thereby provide at least one mountain fold portion and at least a pair of valley fold portions. Flat heat transfer tubes,
A plurality of fins disposed between each of the flat heat transfer tubes and on the outer surface of the uppermost and lowermost flat heat transfer tubes;
A pair of side plates disposed so as to be in contact with an upper portion of the fin disposed at the uppermost stage and a lower portion of the fin disposed at the lowermost stage;
A heat exchanger comprising:
The fin is a corrugated fin bent into a waveform by bending a plurality of times,
In the flat heat transfer tube and the side plate, the fins at a portion corresponding to the valley fold portion and the mountain fold portion are formed with a bending pitch larger than the bending pitch of the fin at other portions. Exchanger.

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