Heat exchanger for refrigerator, refrigerator having heat exchanger for refrigerator, and method for manufacturing heat exchanger for refrigerator

Abstract

To provide a heat exchanger for a refrigerator capable of maintaining excellent heat transfer of a flat tube and reducing labor and cost involved in positioning of brazing.SOLUTION: A heat exchanger for a refrigerator comprises a plurality of flat tubes arranged in a matrix, a one-side header and the other-side header connected to one-side end parts and the other-side end parts of the flat tubes, and fins. The one-side header has a one-side inner member having a plurality of one-side openings into which the one-side end parts are inserted, a one-side outer member connected to the one-side inner member, and a side flow path forming member. The other-side header has the other-side inner member having a plurality of other-side openings into which the other-side end parts are inserted, the other-side outer member connected to the other-side inner member, and the other-side flow path forming member. The one-side header, the plurality of flat tubes, and the other-side header form one or more first flow paths from the one-side header to the other-side header, and one or more second flow paths from the other-side header to the one-side header.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a heat exchanger for a refrigerator, a refrigerator having the heat exchanger for a refrigerator, and a method for manufacturing the heat exchanger for a refrigerator. [Background technology]

[0002] In recent years, there has been a competition to reduce the energy consumption of refrigerators, and there is a demand for a heat exchanger for a refrigerator that can efficiently cool the interior of the refrigerator.

[0003] For example, Patent Document 1 discloses a heat exchanger for refrigeration that includes a refrigerant conducting member having a plurality of flat tubes arranged facing each other in approximately parallel relation at a predetermined interval, and a cold storage material disposed in the gap between the two facing flat tubes. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-70051 Summary of the Invention [Problem to be solved by the invention]

[0005] In the refrigerant conducting member of Patent Document 1, the ends of a plurality of flat tubes are connected by a bent portion to form a serpentine shape. As a method for forming the serpentine refrigerant conducting portion, for example, the following two methods are conceivable. As a first method, it is conceivable to form the bent portion by bending a long flat tube. In this case, it is necessary to thicken the flat tube so that the refrigerant flow path inside the bent portion is not crushed, and there is a problem that the heat transfer property of the flat tube decreases due to the thickening. As a second method, it is conceivable to connect a separate curved part corresponding to the bent portion to the flat tube by brazing it. In this case, there is a problem that it is time-consuming and costly to position the brazing.

[0006] Therefore, an object of the present invention is to provide a heat exchanger for a refrigerator that maintains good heat transfer properties of the flat tubes while reducing the effort and cost associated with positioning of the brazing. [Means for solving the problem]

[0007] In order to solve the above problems, a heat exchanger for a refrigerator according to one aspect of the present invention comprises: A plurality of flat tubes extending in a longitudinal direction and arranged in a matrix in a cross direction intersecting the longitudinal direction; One-side header and another-side header connected to one-side end and another-side end of the flat tube, respectively; and a fin disposed in a gap between the opposing flat tubes, the one-side header includes a one-side inner member having a plurality of one-side openings into which the one-side end portions are inserted, a one-side outer member opposed to and connected to the one-side inner member, and a one-side flow path forming member disposed between the one-side inner member and the one-side outer member to form a one-side refrigerant flow path, the other-side header includes: an other-side inner member having a plurality of other-side openings into which the other-side end portions are inserted; an other-side outer member connected to and facing the other-side inner member; and an other-side flow path forming member disposed between the other-side inner member and the other-side outer member to form a other-side refrigerant flow path, The one-side header, the plurality of flat tubes, and the other-side header form one or more first flow paths from the one-side header to the other-side header, and one or more second flow paths from the other-side header to the one-side header. Effect of the Invention

[0008] According to this invention, good heat transfer properties of the flat tubes can be maintained, and the effort and cost associated with positioning of the brazing can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a schematic configuration of a refrigerator including a refrigerator heat exchanger according to the present invention. [Diagram 2] FIG. 1 is a perspective view of a refrigeration heat exchanger according to a first embodiment. [Diagram 3] 3 is a perspective view of the refrigeration heat exchanger shown in FIG. 2, seen from a different angle. [Figure 4] FIG. 3 is a plan view of the refrigeration heat exchanger shown in FIG. 2. [Diagram 5] FIG. 3 is a perspective view of one side header in the refrigeration heat exchanger shown in FIG. 2. [Figure 6] FIG. 6 is an exploded perspective view of one side header shown in FIG. 5. [Figure 7] 3 is a perspective view showing the refrigeration heat exchanger shown in FIG. 2 with one outer member removed. FIG. [Figure 8] 3 is a perspective view of the other header in the refrigeration heat exchanger shown in FIG. 2. [Figure 9] FIG. 9 is an exploded perspective view of the other header shown in FIG. 8. [Figure 10] 3 is a perspective view showing the refrigeration heat exchanger shown in FIG. 2 with the other outer member removed. FIG. [Figure 11] FIG. 11 is an exploded perspective view of one header in the refrigeration heat exchanger according to the second embodiment. [Figure 12] FIG. 11 is an exploded perspective view of the other-side header in the refrigeration heat exchanger according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a refrigerator 1 according to the present invention will be described with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., terms including "up", "down", "right", "left", "front" and "rear") are used as necessary, but the use of these terms is for the purpose of facilitating understanding of the present disclosure with reference to the drawings, and the meanings of these terms do not limit the technical scope of the present disclosure. In addition, the following description is essentially merely illustrative, and is not intended to limit the present disclosure, its applications, or its uses. Furthermore, the drawings are schematic, and the ratios of the dimensions do not necessarily correspond to the actual ones.

[0011] [First embodiment] A refrigeration heat exchanger 22 according to the first embodiment and a refrigerator 1 including the refrigeration heat exchanger 22 will be described with reference to Figs. 1 to 10.

[0012] FIG. 1 is a schematic diagram showing a schematic configuration of a refrigerator 1 including refrigerator heat exchangers 22, 24 according to the present invention. FIG. 2 is a perspective view of the refrigeration heat exchanger 22 according to the first embodiment. FIG. 3 is a perspective view of the refrigeration heat exchanger 22 shown in FIG. 2, seen from a different angle. FIG. 4 is a plan view of the refrigeration heat exchanger 22 shown in FIG. 2. FIG. 5 is a perspective view of one-side header 40 in the refrigeration heat exchanger 22 shown in FIG. 2. FIG. 6 is an exploded perspective view of the one-side header 40 shown in FIG. 5. FIG. 7 is a perspective view showing a state in which the one-side outer member 41 is removed in the refrigeration heat exchanger 22 shown in FIG. 2. FIG. 8 is a perspective view of the other-side header 50 in the refrigeration heat exchanger 22 shown in FIG. 2. FIG. 9 is an exploded perspective view of the other-side header 50 shown in FIG. 8. FIG. 10 is a perspective view showing a state in which the other-side outer member 51 is removed in the refrigeration heat exchanger 22 shown in FIG. 2.

[0013] The schematic configuration of refrigerator 1 will be described with reference to Fig. 1. As shown in Fig. 1, refrigerator 1 has a box-shaped main body 10. An internal partition plate 11 that divides the internal space of main body 10 is provided in approximately the center in the vertical direction of main body 10. The upper side of internal partition plate 11 is defined as a refrigeration compartment 12, and the lower side of internal partition plate 11 is defined as a freezer compartment 13.

[0014] A refrigerator compartment door 14 is provided on the front side of the refrigerator compartment 12 so as to be freely opened and closed, and a freezer compartment door 15 is provided on the front side of the freezer compartment 13 so as to be freely opened and closed.

[0015] A refrigeration duct 20 extending in the vertical direction is provided at the rear of the refrigerator compartment 12. A freezing duct 21 extending in the vertical direction is provided at the rear of the freezer compartment 13. A refrigeration heat exchanger 22 serving as a heat exchanger for the refrigerator is housed inside the refrigeration duct 20.

[0016] A refrigeration fan 23 is disposed above the refrigeration heat exchanger 22. The inside of the refrigeration compartment 12 is configured such that, by driving the refrigeration fan 23, the air inside the refrigeration compartment 12 is sucked in from below the refrigeration duct 20, passes through the refrigeration heat exchanger 22 for heat exchange, and then is blown out from above the refrigeration duct 20 into the inside of the refrigeration compartment 12. Therefore, the air inside the compartment flows, for example, from below to above in the refrigeration heat exchanger 22.

[0017] A refrigeration heat exchanger 24 serving as a heat exchanger for a refrigerator is accommodated inside the refrigeration duct 21. A refrigeration fan 25 is arranged above the refrigeration heat exchanger 24. The inside of the freezer compartment 13 is configured such that, by driving the refrigeration fan 25, the air inside the freezer compartment 13 is sucked in from below the refrigeration duct 21, passes through the refrigeration heat exchanger 24 for heat exchange, and then is blown out from above the refrigeration duct 21 into the inside of the freezer compartment 13. A heater 26 is arranged below the refrigeration duct 21.

[0018] A compressor 30 is installed at the upper rear of the main body 10. A condenser 31 is connected to the compressor 30 via a refrigerant pipe 32. A three-way valve 33 is connected to the condenser 31, and the refrigeration heat exchanger 22 is connected to the three-way valve 33 via an expansion mechanism 34. The freezing heat exchanger 24 is connected to the three-way valve 33 via an expansion mechanism 35.

[0019] A refrigeration refrigerant cycle is formed in which the refrigerant circulates sequentially through the compressor 30, the condenser 31, the three-way valve 33, the expansion mechanism 34, and the refrigeration heat exchanger 22, and a refrigeration refrigerant cycle is formed in which the refrigerant circulates sequentially through the compressor 30, the condenser 31, the three-way valve 33, the expansion mechanism 35, and the refrigeration heat exchanger 24. The refrigeration refrigerant cycle and the refrigeration refrigerant cycle can be switched by switching the three-way valve 33.

[0020] Next, the configuration of the refrigeration heat exchanger 22 will be described with reference to Figs.

[0021] As shown in Figures 2 to 4, the refrigeration heat exchanger 22 includes a pair of one-side headers 40 and other-side headers 50, an inlet pipe 61, an outlet pipe 62, a plurality of flat tubes 70, fins 75, and a cold storage section 80.

[0022] The flat tubes 70 extend in the longitudinal direction (left-right direction, Y-axis direction) and are arranged in a matrix in intersecting directions (front-rear direction, X-axis direction; up-down direction, Z-axis direction) that intersect the longitudinal direction. For example, the flat tubes 70 are arranged in three rows, first to third rows, from bottom to top in the up-down direction (Z-axis direction), and in four stages, first to fourth stages, from front to back in the front-rear direction (X-axis direction). Thus, the refrigeration heat exchanger 22 has a total of 12 flat tubes 70.

[0023] The flat tube 70 is made of aluminum (including aluminum alloy, hereinafter referred to as made of aluminum). The flat tube 70 is formed into a flat shape by extrusion. As shown in Fig. 7 and Fig. 10, the flat tube 70 has a plurality of (e.g., six) passages 71 arranged in the vertical direction (Z-axis direction) and having a substantially rectangular cross section.

[0024] The fins 75 are made of aluminum and have a corrugated or zigzag shape. The fins 75 extend in the left-right direction (Y-axis direction) and the up-down direction (Z-axis direction) and are disposed in the gaps between the opposing flat tubes 70. As shown in Fig. 4, the fins 75 are disposed, for example, between the first and second tier flat tubes 70 and between the third and fourth tier flat tubes 70.

[0025] The cold storage unit 80 extends in the left-right direction (Y-axis direction) and the up-down direction (Z-axis direction) and is disposed in the gap between the opposing flat tubes 70. As shown in Fig. 4, the cold storage unit 80 is disposed, for example, between the second stage flat tube 70 and the third stage flat tube 70.

[0026] The cold storage unit 80 has a cold storage bag 83 in which a cold storage material 84 is enclosed, and a cold storage container 81 that houses and holds the cold storage bag 83. The cold storage container 81 is made of aluminum and extends in the left-right direction (Y-axis direction) and the up-down direction (Z-axis direction). The cold storage container 81 is a bottomed box-shaped container with an opening at the top and a U-shaped cross section. The cold storage container 81 is configured so that each side surface thereof is in close contact with the side surface of the second stage flat tube 70 and the side surface of the third stage flat tube 70. By using the same material for the fins 75 and the cold storage container 81, when the flat tubes 70 and the fins 75 are heat-welded, the flat tubes 70 and the cold storage container 81 can also be heat-welded at the same time.

[0027] The cold storage bag 83 is made of a thin film bag of metal such as aluminum, and is flexible and deformable. A corrosion-resistant layer made of resin is formed on the inner surface of the cold storage bag 83 to suppress corrosion caused by the cold storage material 84. The cold storage bag 83 containing the cold storage material 84 is configured to be in close surface contact with the inner surface of the cold storage container 81. The cold storage material 84 contains water, a gel material, and a preservative, and has a melting point of, for example, -5°C to -15°C.

[0028] 2 and 3, the one-side header 40 is disposed on one side of the flat tubes 70, and the other-side header 50 is disposed on the other side of the flat tubes 70. The one-side header 40 is connected to one end 70a of the flat tubes 70, and the other-side header 50 is connected to the other end 70b of the flat tube 70. The one-side header 40 and the other-side header 50 extend in the front-to-rear direction (X-axis direction) and the up-down direction (Z-axis direction). The one-side header 40 and the other-side header 50 are made of aluminum.

[0029] 5 to 7, the one-side header 40 includes a one-side outer member 41, a one-side inner member 42, a one-side upper cap 43, a one-side lower cap 44, a one-side partition plate 45, and a one-side flow path frame 46. The one-side upper cap 43 is attached to an upper opening formed by the combined one-side outer member 41 and one-side inner member 42 to close the upper opening. The one-side lower cap 44 is attached to a lower opening formed by the combined one-side outer member 41 and one-side inner member 42 to close the lower opening. The one-side outer member 41 and one-side inner member 42 are each processed to have a wavy shape in a plan view.

[0030] 6, the one-side outer member 41 has a one-side first abutment portion 47a at a boundary step located at the boundary between a recess corresponding to the first stage flat tube 70 and a recess corresponding to the second stage flat tube 70. The one-side outer member 41 also has a one-side first abutment portion 47a at a boundary step located at the boundary between a recess corresponding to the third stage flat tube 70 and a recess corresponding to the fourth stage flat tube 70. The one-side first abutment portion 47a protrudes toward the one-side inner member 42 and is configured to abut against a one-side second abutment portion 48a described later.

[0031] The one-side outer member 41 has a one-side first spaced portion 47b at a boundary step portion located at the boundary between a recess corresponding to the second stage of flat tubes 70 and a recess corresponding to the third stage of flat tubes 70. The one-side first spaced portion 47b protrudes toward the one-side inner member 42, but is configured to be spaced from a one-side second spaced portion 48b described later.

[0032] An inlet pipe 61 is connected to a portion of the one-side outer member 41 corresponding to the first stage and first row of flat tubes 70, and an outlet pipe 62 is connected to a portion of the one-side outer member 41 corresponding to the fourth stage and third row of flat tubes 70. The refrigerant is introduced into the refrigeration heat exchanger 24 through the inlet pipe 61 and discharged from the refrigeration heat exchanger 24 through the outlet pipe 62.

[0033] The one-side internal member 42 has a plurality of one-side openings 42a corresponding to a plurality of flat tubes 70 arranged in a matrix in intersecting directions (front-rear direction, X-axis direction; up-down direction, Z-axis direction) intersecting the longitudinal direction. The one-side openings 42a are arranged, for example, in three rows, from the first row to the third row, from bottom to top in the up-down direction (Z-axis direction), and in four rows, from the first row to the fourth row, from front to back in the front-rear direction (X-axis direction). Therefore, the one-side internal member 42 has a total of 12 one-side openings 42a. As shown in FIG. 7, one-side end portions 70a of the flat tubes 70 are inserted into the one-side openings 42a.

[0034] The one-side inner member 42 has a one-side second abutment portion 48a at a boundary step located at the boundary between the recess corresponding to the first stage flat tube 70 and the recess corresponding to the second stage flat tube 70. The one-side inner member 42 also has a one-side second abutment portion 48a at a boundary step located at the boundary between the recess corresponding to the third stage flat tube 70 and the recess corresponding to the fourth stage flat tube 70. The one-side second abutment portion 48a protrudes toward the one-side outer member 41 and is configured to be in close contact with the one-side first abutment portion 47a. As a result, the front-rear boundary portion between the first stage and the second stage and the front-rear boundary portion between the third stage and the fourth stage do not have a gap, and therefore the refrigerant cannot flow.

[0035] The one-side inner member 42 has a one-side second spaced portion 48b at a boundary step located at the boundary between the recess corresponding to the second stage of flat tubes 70 and the recess corresponding to the third stage of flat tubes 70. The one-side second spaced portion 48b protrudes toward the one-side outer member 41, but is configured to be spaced from the one-side first spaced portion 47b. As a result, a gap is formed at the front-rear boundary portion between the second stage and the third stage, allowing the refrigerant to flow.

[0036] A one-side refrigerant flow path 49 having a substantially bale shape in plan view is formed in the internal space of the one-side header 40 which is formed by combining the one-side outer member 41, the one-side inner member 42, the one-side upper cap 43, and the one-side lower cap 44. A one-side partition plate 45 and a one-side flow path frame 46 which function as one-side flow path forming members are disposed in the internal space of the one-side header 40.

[0037] The one-side partition plate 45 is a plate-like body configured to close the one-side refrigerant flow path 49. The one-side partition plate 45 has a one-side partition protrusion 45a on the side facing the one-side outer member 41. The one-side flow path frame 46 is a frame-like body having a hollow portion that opens the one-side refrigerant flow path 49 to allow the refrigerant to flow in the up-down direction (Z-axis direction). The one-side flow path frame 46 has a one-side frame protrusion 45a on the side facing the one-side outer member 41. The one-side partition protrusion 45a and the one-side frame protrusion 45a act as one-side locking protrusions and engage with one-side engagement hole 48d (shown in FIG. 2) formed in the one-side outer member 41. This allows the refrigerant flow path in the one-side header 40 to be appropriately and easily changed depending on the engagement position of the one-side flow path forming members 45, 46. In the example shown in Figures 6 and 7, one-side flow path frame 46 is disposed at the upper and lower boundaries of the second and third rows in the first tier and at the upper and lower boundaries of the first and second rows in the fourth tier, and one-side partition plate 45 is disposed at the other upper and lower boundaries.

[0038] 8 to 10, the other-side header 50 includes an other-side outer member 51, an other-side inner member 52, an other-side upper cap 53, an other-side lower cap 54, and an other-side partition plate 55. The other-side upper cap 53 is attached to an upper opening formed by the combined other-side outer member 51 and the other-side inner member 52 to close the upper opening. The other-side lower cap 54 is attached to a lower opening formed by the combined other-side outer member 51 and the other-side inner member 52 to close the lower opening. The other-side outer member 51 and the other-side inner member 52 are each processed to have a wavy shape in a plan view.

[0039] 9, the other-side outer member 51 has an other-side first abutment portion 57a ​​at a boundary step portion located at the boundary between a recess corresponding to the second stage of flat tubes 70 and a recess corresponding to the third stage of flat tubes 70. The other-side first abutment portion 57a ​​protrudes toward the other-side inner member 52, and is configured to be in close surface contact with an other-side second abutment portion 58a described later.

[0040] The other-side outer member 51 has an other-side first separated portion 57b at a boundary step located at the boundary between the recess corresponding to the first stage flat tube 70 and the recess corresponding to the second stage flat tube 70. The other-side outer member 51 also has an other-side first separated portion 57b at a boundary step located at the boundary between the recess corresponding to the third stage flat tube 70 and the recess corresponding to the fourth stage flat tube 70. The other-side first separated portion 57b protrudes toward the other-side inner member 52, but is configured to be separated from the other-side second separated portion 58b described later.

[0041] The other-side internal member 52 has a plurality of other-side openings 52a corresponding to a plurality of flat tubes 70 arranged in a matrix in intersecting directions (front-rear direction, X-axis direction; up-down direction, Z-axis direction) intersecting the longitudinal direction. The other-side openings 52a are arranged, for example, in three rows, ie, a first row, a second row, and a third row, from bottom to top in the up-down direction (Z-axis direction), and in four rows, ie, a first row, a second row, a third row, and a fourth row, from front to back in the front-rear direction (X-axis direction). Therefore, the other-side internal member 52 has a total of 12 other-side openings 52a. As shown in FIG. 10, the other-side end portions 70b of the flat tubes 70 are inserted into the other-side openings 52a.

[0042] The other-side inner member 52 has an other-side second separation portion 58b at a boundary step located at the boundary between the recess corresponding to the first stage flat tube 70 and the recess corresponding to the second stage flat tube 70. The other-side inner member 52 also has an other-side second separation portion 58b at a boundary step located at the boundary between the recess corresponding to the third stage flat tube 70 and the recess corresponding to the fourth stage flat tube 70. The other-side second separation portion 58b protrudes toward the other-side outer member 51, but is configured to be separated from the other-side first separation portion 57b. As a result, the front-rear boundary portion between the first stage and the second stage and the front-rear boundary portion between the third stage and the fourth stage each have a gap, allowing the refrigerant to flow.

[0043] The other-side inner member 52 has an other-side second abutment portion 58a at a boundary step located at the boundary between the recess corresponding to the second stage of flat tubes 70 and the recess corresponding to the third stage of flat tubes 70. The other-side second abutment portion 58a protrudes toward the other-side outer member 51 and is configured to closely contact and make surface contact with the other-side first abutment portion 57a. As a result, the front-rear boundary portion between the second stage and the third stage does not have a gap, so that the refrigerant cannot flow.

[0044] An other-side refrigerant flow path 59 having a substantially bale shape in a plan view is formed in the internal space of the other-side header 50 which is formed by combining the other-side outer member 51, the other-side inner member 52, the other-side upper cap 53, and the other-side lower cap 54. An other-side partition plate 55 which acts as an other-side flow path forming member is disposed in the internal space of the other-side header 50.

[0045] The other-side partition plate 55 is a plate-like body configured to close the other-side refrigerant flow passage 59. The other-side partition plate 55 has an other-side partition protrusion 55a on the side facing the other-side outer member 51. The other-side partition protrusion 55a acts as an other-side locking protrusion and engages with the other-side engagement hole 58d (shown in FIG. 3) formed in the other-side outer member 51. This allows the refrigerant flow passage in the other-side header 50 to be appropriately and easily changed depending on the engagement position of the other-side flow passage forming member 55. In the example shown in FIG. 9 and FIG. 10, the other-side partition plate 55 is disposed at the upper and lower boundaries of the first and second rows in the first stage and at the upper and lower boundaries of the second and third rows. The other-side partition plate 55 is disposed at the upper and lower boundaries of the first and second rows in the second stage and at the upper and lower boundaries of the second and third rows. The other side partition plate 55 is disposed at the upper and lower boundaries of the first and second rows and the upper and lower boundaries of the second and third rows in the third tier. The other side partition plate 55 is disposed at the upper and lower boundaries of the first and second rows and the upper and lower boundaries of the second and third rows in the fourth tier.

[0046] Next, the operation of the refrigeration heat exchanger 22 and the refrigerator 1 will be described.

[0047] By driving the compressor 30, the refrigerant is sent to the condenser 31, and by switching the three-way valve 33, the refrigerant is sent to either the refrigeration heat exchanger 22 or the freezing heat exchanger 24, which function as a cooler.

[0048] The refrigerant sent to the refrigeration heat exchanger 22 flows through the inlet pipe 61 into the one-side refrigerant flow passage 49 of the first stage and first row in the one-side header 40. The refrigerant flows through the first stage and first row flat tubes 70 and flows into the other-side refrigerant flow passage 59 of the first stage and first row in the other-side header 50. Since there is a gap at the front-rear boundary between the first stage and the second stage in the other-side header 50, the refrigerant flows from the other-side refrigerant flow passage 59 of the first stage and first row to the other-side refrigerant flow passage 59 of the second stage and first row in the other-side header 50.

[0049] The refrigerant flows through the second stage and first row of flat tubes 70 and flows into the second stage and first row of one-side refrigerant flow passages 49 in the one-side header 40. Since there is a gap at the front-rear boundary between the second stage and the third stage in the one-side header 40, the refrigerant flows from the second stage and first row of one-side refrigerant flow passages 49 to the third stage and first row of one-side refrigerant flow passages 49 in the one-side header 40.

[0050] The refrigerant flows through the third stage and first row of flat tubes 70 and flows into the third stage and first row of other-side refrigerant flow passage 59 in the other-side header 50. Since there is a gap at the front-rear boundary between the third stage and the fourth stage in the other-side header 50, the refrigerant flows from the third stage and first row of other-side refrigerant flow passage 59 to the fourth stage and first row of other-side refrigerant flow passage 59 in the other-side header 50.

[0051] The refrigerant flows through the fourth stage and first row of flat tubes 70 and flows into the one-side refrigerant flow passage 49 of the fourth stage and first row in the one-side header 40. Since the one-side flow passage frame 46 is disposed at the upper and lower boundary between the first row and the second row in the fourth stage of the one-side header 40, the refrigerant flows from the one-side refrigerant flow passage 49 of the fourth stage and first row to the one-side refrigerant flow passage 49 of the fourth stage and second row in the one-side header 40.

[0052] The refrigerant flows through the fourth stage and second row of flat tubes 70 and flows into the fourth stage and second row of other-side refrigerant flow passage 59 in the other-side header 50. Since there is a gap at the front-rear boundary between the fourth stage and the third stage in the other-side header 50, the refrigerant flows from the fourth stage and second row of other-side refrigerant flow passage 59 to the third stage and second row of other-side refrigerant flow passage 59 in the other-side header 50.

[0053] The refrigerant repeatedly flows alternately between the one-side header 40 and the other-side header 50 through the multiple flat tubes 70. Then, the refrigerant flows into the other-side refrigerant flow passage 59 of the fourth stage and third row of the other-side header 50, and then flows through the flat tubes 70 of the fourth stage and third row to flow into the one-side refrigerant flow passage 49 of the fourth stage and third row in the one-side header 40. The refrigerant that has flowed into the one-side refrigerant flow passage 49 of the fourth stage and third row in the one-side header 40 flows out through the outlet pipe 62 and is returned to the compressor 30.

[0054] Therefore, in the refrigeration heat exchanger 22, the one-side header 40, the flat tubes 70, and the other-side header 50 form a plurality of first flow paths from the one-side header 40 to the other-side header 50, and a plurality of second flow paths from the other-side header 50 to the one-side header 40. That is, the refrigerant flow path in the refrigeration heat exchanger 22 is configured so that the refrigerant alternately flows between the one-side header 40 and the other-side header 50 via the flat tubes 70. In other words, the refrigeration heat exchanger 22 is configured to have a refrigerant flow path in which the flat tubes 70 are connected in series via the one-side header 40 and the other-side header 50. In this way, the refrigerant flows so as to move back and forth between one side and the other side in the flat tubes 70.

[0055] When the refrigeration fan 23 is driven while the refrigeration heat exchanger 22 is flowing, the air inside the refrigeration chamber 12 flows from bottom to top in the refrigeration duct 20, and flows from bottom to top in the fins 75 of the refrigeration heat exchanger 22. The refrigerant exchanges heat with the air inside the refrigeration chamber 12 in the flat tubes 70 of the refrigeration heat exchanger 22, absorbing heat and evaporating. The air inside the refrigeration chamber 12 is cooled by the heat exchange with the refrigeration heat exchanger 22. At the same time, the cold storage material 84 is also cooled in the refrigeration heat exchanger 22.

[0056] In addition, the refrigerant sent to the refrigeration heat exchanger 24 exchanges heat with the inside air flowing from the bottom to the top in the refrigeration duct 21 by driving the refrigeration fan 25, and the inside air in the freezing chamber 13 is cooled. The cooled inside air in the freezing chamber 13 is returned to the freezing chamber 13.

[0057] In the cold storage section 80 of the refrigeration heat exchanger 24, the cold storage bag 83 containing the cold storage material 84 is in close surface contact with the cold storage container 81, and the cold storage container 81 is in close surface contact with the flat tubes 70, thereby reducing thermal resistance and allowing the cold storage material 84 to be efficiently cooled by the refrigerant flowing through the flat tubes 70. This shortens the operating time of the compressor 30, achieving further energy savings.

[0058] In addition, in this embodiment, the one-side header 40 and the other-side header 50 function as connection members that connect the flat tubes 70. Therefore, compared to the conventional technology of forming a curved portion by bending the long flat tubes 70 into a serpentine shape or preparing a separate curved part corresponding to the curved portion, the shape accuracy of the flat tubes 70, the positioning accuracy of the flat tubes 70 relative to the one-side header 40 and the other-side header 50, and the adhesion of the cold storage section 80 to the flat tubes 70 are significantly improved, and the variation between manufacturing lots is also reduced.

[0059] An example of a method for manufacturing the above-mentioned refrigeration heat exchanger 22 will be described.

[0060] A brazing paint for headers is applied to the surface of the one-side header 40. When the one-side outer member 41 and the one-side inner member 42, the one-side upper cap 43 and the one-side lower cap 44, the one-side partition plate 45 and the one-side flow path frame 46, and the flat tubes 70 are combined and brazed in a furnace, an aluminum-silicon alloy, i.e., a brazing material, is formed, and these are thermally welded. Similarly, a brazing paint for headers is applied to the surface of the other-side header 50. When the other-side outer member 51 and the other-side inner member 52, the other-side upper cap 53 and the other-side lower cap 54, the other-side partition plate 55, and the flat tubes 70 are combined and brazed in a furnace, an aluminum-silicon alloy, i.e., a brazing material, is formed, and these are thermally welded. This allows the one-side header 40, the other-side header 50, and the flat tubes 70 to be easily and firmly integrated. The brazing paint for headers contains silicon particles, a noncorrosive flux, and a binder resin.

[0061] A brazing paint for flat tubes is applied to the surface of the flat tubes 70. The brazing paint for flat tubes contains silicon particles, a noncorrosive flux, and a binder resin. When the fins 75 are disposed between the opposing flat tubes 70 and brazing is performed in a furnace, an aluminum-silicon alloy, i.e., a brazing material, is formed, and the flat tubes 70 and the fins 75 are thermally welded together. This allows the flat tubes 70 and the fins 75 to be easily and firmly integrated.

[0062] This eliminates the need to apply brazing material to the fins 75, and by using a hydrophilic precoated fin as the fins 75, it is possible to prevent water droplets from being generated on the surfaces of the fins 75. Furthermore, since the noncorrosive flux is contained in a reduced amount, it is possible to prevent adverse effects of residues generated by applying more noncorrosive flux than necessary.

[0063] Furthermore, when furnace brazing is performed with the cold storage container 81 disposed between the opposing flat tubes 70 to which the brazing paint for flat tubes is applied, an aluminum-silicon alloy, i.e., brazing material, is formed, and the flat tubes 70 and the cold storage container 81 of the cold storage section 80 are thermally welded together. This allows the flat tubes 70 and the cold storage container 81 of the cold storage section 80 to be easily and firmly integrated.

[0064] The brazing paint for headers and the brazing paint for flat tubes can be applied to various target components, and the brazing in the furnace can be performed in a state where the one-side header 40, the other-side header 50, the flat tubes 70, the fins 75, and the cold storage container 81 are assembled. This makes it possible to obtain a firmly integrated refrigeration heat exchanger 22 with a small number of steps.

[0065] Also, a hydrophilic treatment (boehmite treatment) can be applied to the refrigeration heat exchanger 22. Specifically, the refrigeration heat exchanger 22 is immersed in pure water at 60°C to 70°C for 5 minutes or more to remove dirt adhering to the fins 75, and then immersed in pure water boiled at 98°C for 5 minutes or more to form an oxide film on the surface of the refrigeration heat exchanger 22. The oxide film formed on the surfaces of various aluminum members improves the corrosion resistance of the refrigeration heat exchanger 22.

[0066] [Embodiment 2] A refrigeration heat exchanger 22 according to the second embodiment will be described with reference to Fig. 11 and Fig. 12. Fig. 11 is an exploded perspective view of one side header 40 in the refrigeration heat exchanger 22 according to the second embodiment. Fig. 12 is an exploded perspective view of the other side header 50 in the refrigeration heat exchanger 22 according to the second embodiment.

[0067] In the refrigeration heat exchanger 22 according to the second embodiment, only the internal configurations of the one-side header 40 and the other-side header 50 are different from those of the first embodiment, and the other configurations are the same as those of the first embodiment. Therefore, the following description will focus on the differences from the first embodiment.

[0068] 11, the one-side partition plate 45 and the one-side flow path frame 46, which function as one-side flow path forming members, are not disposed inside the one-side header 40. As a result, in each of the first to fourth stages of the one-side header 40, the one-side refrigerant flow paths 49 communicate with each other in the up-down direction (Z-axis direction), in other words, between the first row, the second row, and the third row.

[0069] In the one-side header 40, the one-side first abutment portion 47a is in close surface contact with the one-side second abutment portion 48a, so that the refrigerant cannot flow in the front-rear boundary between the first and second stages and the front-rear boundary between the third and fourth stages. In the one-side header 40, the one-side first separating portion 47b is separated from the one-side second separating portion 48b, so that the refrigerant can flow in the front-rear boundary between the second and third stages.

[0070] 12, an other-side partition plate 55 acting as an other-side flow path forming member is not disposed inside the other-side header 50. As a result, in each of the first to fourth stages of the other-side header 50, the other-side refrigerant flow paths 59 communicate with each other in the vertical direction (Z-axis direction), in other words, between the first row, the second row, and the third row.

[0071] In the other-side header 50, the other-side first contact portion 57a ​​is in close surface contact with the other-side second contact portion 58a, so that refrigerant is not allowed to flow at the front-rear boundary between the second and third stages. In the other-side header 50, the other-side first separating portion 57b is separated from the other-side second separating portion 58b, so that refrigerant is allowed to flow at the front-rear boundary between the first and second stages and the front-rear boundary between the third and fourth stages.

[0072] The flow of the refrigerant in the refrigeration heat exchanger 22 having the above-mentioned configuration will be described.

[0073] The refrigerant that flows from the inlet pipe 61 into the one-side refrigerant flow passage 49 of the first stage and the first row of the one-side header 40 flows in the up-down direction (Z-axis direction) of the first stage of the one-side header 40, in other words, flows into the one-side refrigerant flow passage 49 in the first stage of the one-side header 40. The refrigerant flows through the first row of flat tubes 70, the second row of flat tubes 70, and the third row of flat tubes 70 in the first stage. The refrigerant that flows through the flat tubes 70 flows into the other-side refrigerant flow passage 59 in the first stage of the other-side header 50. Since there is a gap at the front-rear boundary between the first stage and the second stage of the other-side header 50, the refrigerant flows from the other-side refrigerant flow passage 59 of the first stage to the other-side refrigerant flow passage 59 of the second stage in the other-side header 50.

[0074] The refrigerant flows through the first row of flat tubes 70, the second row of flat tubes 70, and the third row of flat tubes 70 in the second stage, and flows into one-side refrigerant flow passage 49 of the second stage in one-side header 40. Since there is a gap at the front-rear boundary between the second and third stages of one-side header 40, the refrigerant flows from one-side refrigerant flow passage 49 of the second stage to one-side refrigerant flow passage 49 of the third stage in one-side header 40.

[0075] The refrigerant flows through the first row of flat tubes 70, the second row of flat tubes 70, and the third row of flat tubes 70 in the third stage, and flows into the other-side refrigerant flow passage 59 of the third stage in the other-side header 50. Since there is a gap at the front-rear boundary between the third and fourth stages of the other-side header 50, the refrigerant flows from the other-side refrigerant flow passage 59 of the third stage to the other-side refrigerant flow passage 59 of the fourth stage in the other-side header 50.

[0076] The refrigerant flows through the first row of flat tubes 70, the second row of flat tubes 70, and the third row of flat tubes 70 in the fourth stage, and flows into the one-side refrigerant flow passage 49 of the fourth stage in the one-side header 40. The refrigerant that has flowed into the one-side refrigerant flow passage 49 of the fourth stage in the one-side header 40 flows out from the outlet pipe 62 and is returned to the compressor 30.

[0077] Therefore, in the refrigeration heat exchanger 22, the one-side header 40, the flat tubes 70, and the other-side header 50 form a plurality of first flow paths from the one-side header 40 to the other-side header 50, and a plurality of second flow paths from the other-side header 50 to the one-side header 40. That is, the refrigerant flows alternately between the one-side header 40 and the other-side header 50 through the flat tubes 70. In other words, the second embodiment is common to the first embodiment in that the refrigerant flows so as to move back and forth between one side and the other side in the flat tubes 70. However, in the second embodiment, the first row of flat tubes 70, the second row of flat tubes 70, and the third row of flat tubes 70 are connected in parallel, so that the pipe cross-sectional area is three times larger than that of the first embodiment in which the flat tubes 70 are connected in series. Therefore, the pressure loss in the refrigeration heat exchanger 22 is reduced, so that it is possible to increase the number of flat tubes 70 arranged in the refrigeration heat exchanger 22 and to lengthen the flat tubes 70.

[0078] Moreover, the refrigerant flow path in the refrigeration heat exchanger 22 can be flexibly changed simply by changing the arrangement positions of the one-side flow path forming members in the one-side header 40 and the other-side flow path forming members in the other-side header 50. Therefore, the one-side header 40 and the other-side header 50 can be changed flexibly and at low cost in accordance with design changes.

[0079] Third Embodiment In the third embodiment, the brazing paint used for brazing various aluminum members further contains zinc particles.

[0080] In the third embodiment, the brazing paint contains zinc particles in addition to silicon particles, noncorrosive flux, and binder resin. When the brazing paint further contains zinc particles, the corrosion of the zinc particles, which have a high ionization tendency, proceeds first, thereby suppressing the corrosion of various aluminum members. In other words, the mechanism of sacrificial corrosion protection works, thereby improving the corrosion resistance of various aluminum members.

[0081] Conventionally, boehmite treatment and alumite treatment have been used as a method for improving the corrosion resistance of the refrigeration heat exchanger 22 disposed in the refrigeration compartment 12, which is in an environment where corrosion easily progresses due to low temperature and high humidity. While these are expensive surface treatment techniques, in the third embodiment, the zinc particles 90 are simply added, and therefore the improvement in corrosion resistance can be realized at low cost.

[0082] Although specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

[0083] The refrigeration heat exchanger 24 can include a pair of one-side headers and an other-side header, an inlet pipe, an outlet pipe, a plurality of flat tubes, fins, and a cold storage section, similar to the above-mentioned refrigeration heat exchanger 22. Since the cold storage material of the cold storage section needs to cool the freezer compartment 13, the melting point of the cold storage material is preferably −20° C. to −30° C. The manufacturing method of the refrigeration heat exchanger 24 is also similar to the manufacturing method of the above-mentioned refrigeration heat exchanger 22.

[0084] The brazing paint for the header and the brazing paint for the flat tube may have the same composition or different compositions.

[0085] The lower ends of the fins 75 can be positioned lower than the lower ends of the first row of flat tubes 70. As a result, when heat exchange is performed between the inside air and the fins 75, moisture generated by frost, condensation, etc. can be collected at the lower ends of the fins 75, improving drainage. Also, the upper ends of the fins 75 may protrude upward beyond the upper ends of the third row of flat tubes 70. As a result, the inside air also flows around the upward protruding parts of the fins 75, improving the heat exchange efficiency of the refrigeration heat exchanger 22.

[0086] In the second embodiment, Fig. 11 shows an aspect in which the one-side partition plate 45 and the one-side flow path frame 46 are not disposed inside the one-side header 40, but it is also possible to arrange in a manner in which only the one-side flow path frame 46 is disposed inside the one-side header 40. Similarly, Fig. 12 shows an aspect in which the other-side partition plate 55 is not disposed inside the other-side header 50, but it is also possible to arrange in a manner in which only the other-side flow path frame having a hollow portion similar to the one-side flow path frame 46 is disposed inside the other-side header 50.

[0087] In the refrigeration heat exchanger 22, one side header 40, a plurality of flat tubes 70, and the other side header 50 may form one first flow path from the one side header 40 to the other side header 50, and one second flow path from the other side header 50 to the one side header 40.

[0088] The present invention and the embodiments can be summarized as follows.

[0089] The refrigerator heat exchanger 22, 24 according to the first aspect of the present invention is A plurality of flat tubes 70 extending in a longitudinal direction and arranged in a matrix in a cross direction intersecting the longitudinal direction; One side header 40 and another side header 50 connected to one side end 70a and another side end 70b of the flat tube 70, respectively; and fins 75 disposed in the gaps between the opposing flat tubes 70. The one-side header 40 includes a one-side inner member 42 having a plurality of one-side openings 42a into which the one-side end portions 70a are inserted, a one-side outer member 41 opposed to and connected to the one-side inner member 42, and one-side flow path forming members 45, 46 disposed between the one-side inner member 42 and the one-side outer member 41 to form a one-side refrigerant flow path 49, The other-side header 50 includes an other-side inner member 52 having a plurality of other-side openings 52a into which the other-side end portions 70b are inserted, an other-side outer member 51 opposed to and connected to the other-side inner member 52, and an other-side flow path forming member 55 disposed between the other-side inner member 52 and the other-side outer member 51 to form an other-side refrigerant flow path 59, The one side header 40, the multiple flat tubes 70, and the other side header 50 form one or more first flow paths from the one side header 40 to the other side header 50, and one or more second flow paths from the other side header 50 to the one side header 40.

[0090] According to the above embodiment, good heat transfer properties of the flat tubes 70 can be maintained, and the effort and cost involved in determining the position of the brazing can be reduced.

[0091] In addition, the refrigerator heat exchanger 22, 24 according to the second aspect has the same structure as the first aspect, The one-side refrigerant flow path 49 is changed by changing the arrangement positions of the one-side flow path forming members 45, 46 in the one-side header 40, The other-side refrigerant flow path 59 is configured to be changed by changing the arrangement position of the other-side flow path forming member 55 in the other-side header 50.

[0092] According to the above embodiment, the one-side header 40 and the other-side header 50 can be changed flexibly and at low cost in response to design changes.

[0093] In addition, the refrigerator heat exchanger 22, 24 according to the third aspect has the same structure as the refrigerator heat exchanger 22, 24 according to the second aspect. The one-side flow passage forming members 45, 46 have one-side locking projections 45a, 46a on the side facing the one-side outer member 41, and the one-side outer member 41 has one-side engagement holes 48d that engage with the one-side locking projections 45a, 46a, The other-side flow passage forming member 55 has an other-side locking projection 55 a on the side facing the other-side outer member 51 , and the other-side outer member 51 has an other-side engagement hole 58 d with which the other-side locking projection 55 engages.

[0094] According to the above embodiment, the refrigerant flow paths in the one-side header 40 and the other-side header 50 can be appropriately and easily changed depending on the engagement positions of the one-side flow path forming members 45, 46 and the other-side flow path forming member 55.

[0095] In addition, the heat exchanger 22, 24 for a refrigerator according to the fourth aspect has the same structure as that of the first aspect, The cooling device further includes a cold storage unit 80 disposed in a gap between the opposing flat tubes 70 .

[0096] According to the above embodiment, the cooled cold storage section 80 can achieve further energy saving.

[0097] In addition, the heat exchanger 22, 24 for a refrigerator according to the fifth aspect has the same structure as that of the first aspect, The surfaces of the fins 75 are subjected to a hydrophilic treatment.

[0098] According to the above aspect, the corrosion resistance is improved by the oxide film formed on the surface of the various aluminum members.

[0099] In addition, the refrigerator 1 according to the sixth aspect is The refrigerator includes a heat exchanger 22, 24 according to any one of the first to fifth aspects.

[0100] According to the above embodiment, good heat transfer properties of the flat tubes 70 can be maintained, and the effort and cost involved in determining the position of the brazing can be reduced.

[0101] A manufacturing method of the refrigerator heat exchanger 22, 24 according to the seventh aspect of the present invention includes the steps of: In any one of the refrigerator heat exchangers 22 and 24 according to the first to fifth aspects, The one-side header 40 and the other-side header 50 are each coated with a brazing paint, and are brazed in a furnace. The one-side inner member 42, the one-side outer member 41, and the one-side flow passage forming members 45, 46 in the one-side header 40 are heat-welded, and the one-side opening 42a of the one-side inner member 42 and the one-side end portion 70a of the flat tube 70 are heat-welded, The other-side inner member 52, the other-side outer member 51 and the other-side flow path forming member 55 in the other-side header 50 are heat welded, and the other-side opening 52a of the other-side inner member 52 and the other-side end portion 70b of the flat tube 70 are heat welded.

[0102] According to the above embodiment, the one-side header 40, the other-side header 50, and the plurality of flat tubes 70 can be easily and firmly integrated together.

[0103] In addition, the refrigerator heat exchanger 22, 24 according to the eighth aspect has the same structure as the refrigerator heat exchanger 22, 24 according to the seventh aspect, A brazing paint is applied to the surface of the flat tube 70, and the flat tube 70 is brazed in a furnace. The flat tubes 70 and the fins 75 are heat-welded.

[0104] According to the above embodiment, the flat tubes 70 and the fins 75 can be easily and firmly integrated.

[0105] In addition, the heat exchanger 22, 24 for a refrigerator according to the ninth aspect has the same structure as the seventh aspect, The refrigerator heat exchangers 22 and 24 further include a cold storage unit disposed in a gap between the opposing flat tubes 70, A brazing paint is applied to the surface of the flat tube 70, and the flat tube 70 is brazed in a furnace. The flat tube 70 and the cold storage container 81 of the cold storage unit 80 are heat-welded.

[0106] According to the above embodiment, the flat tubes 70 and the cold storage container 81 of the cold storage unit 80 can be easily and firmly integrated.

[0107] In addition, a heat exchanger 22, 24 for a refrigerator according to a tenth aspect is any one of the seventh to ninth aspects, The brazing paint includes silicon particles, a non-corrosive flux and a binder resin.

[0108] According to the above embodiment, an aluminum-silicon alloy, that is, a brazing material is formed, thereby making it possible to realize easy and strong thermal welding.

[0109] In addition, the heat exchanger 22, 24 for a refrigerator according to an eleventh aspect has the same structure as the heat exchanger 22, 24 for a refrigerator according to the tenth aspect, The braze paint further comprises zinc particles.

[0110] According to the above aspect, it is possible to improve corrosion resistance at low cost. [Explanation of symbols]

[0111] 1. Refrigerator 10. Main unit 11…Interior partition 12…Refrigerator 13…Freezer 14…Refrigerator door 15…Freezer door 20...Refrigeration duct 21...Refrigeration duct 22...Refrigeration heat exchanger (refrigerator heat exchanger) 23...Refrigeration fan 24...Heat exchanger for refrigeration (heat exchanger for refrigerator) 25…Refrigeration fan 26…Heater 30…Compressor 31…Condenser 32…Refrigerant piping 33…Three-way valve 34…Expansion mechanism 35…Expansion mechanism 40...One side header 41...One side external material 42...One side internal material 42a...One side opening 43…One side upper cap 44…One side lower cap 45...One-side partition plate (one-side flow path forming member) 45a...One-side partition protrusion (one-side locking protrusion) 46...One-side flow passage frame (one-side flow passage forming member) 46a...One side frame protrusion (one side locking protrusion) 47a...One side first contact part 47b...One side first separation part 48a...One side second contact part 48b...One side second separation part 48d...One side engagement hole 49...One-side refrigerant flow path 50…Other side header 51...Other side external material 52...Other side internal material 52a...Other side opening 53…Other side upper cap 54…Other side lower cap 55...Other side partition plate (other side flow passage forming member) 55a...Other side partition protrusion (other side locking protrusion) 57a...Other side first contact part 57b...Other side first separation part 58a...Other side second contact part 58b…Other side second separation part 58d…Other side engagement hole 59...Other side refrigerant flow path 61...Inlet pipe 62...Outlet pipe 70…Flat tube 70a...One side end 70b…Other side end 71...Aisle 75…Fin 80...Cold storage section 81...Cool storage container 83...Cold storage bag 84...Cold storage material

Claims

1. A plurality of flat tubes extending in a longitudinal direction and arranged in a matrix in a cross direction intersecting the longitudinal direction; One side header to which one side end portions of the plurality of flat tubes are connected; Another header to which the other end portions of the flat tubes are connected; and a fin disposed in a gap between the opposing flat tubes, the one-side header includes a one-side inner member having a plurality of one-side openings into which the one-side end portions are inserted, a one-side outer member opposed to and connected to the one-side inner member, and a one-side flow path forming member disposed between the one-side inner member and the one-side outer member to form a one-side refrigerant flow path, the other-side header includes: an other-side inner member having a plurality of other-side openings into which the other-side end portions are inserted; an other-side outer member connected to and facing the other-side inner member; and an other-side flow path forming member disposed between the other-side inner member and the other-side outer member to form a other-side refrigerant flow path, one or more first flow paths from the one-side header to the other-side header, and one or more second flow paths from the other-side header to the one-side header, are formed by the one-side header, the plurality of flat tubes, and the other-side header.

2. The one-side refrigerant flow path is changed by changing the arrangement position of the one-side flow path forming member in the one-side header, 2. The heat exchanger for a refrigerator according to claim 1, wherein the other-side refrigerant flow path is changed by changing an arrangement position of the other-side flow path forming member in the other-side header.

3. the one-side flow passage forming member has a one-side locking projection on a side facing the one-side outer member, and the one-side outer member has a one-side engagement hole that engages with the one-side locking projection, 3. The heat exchanger for a refrigerator according to claim 2, wherein the other-side flow passage forming member has an other-side engaging protrusion on a side facing the other-side outer member, and the other-side outer member has an other-side engaging hole that engages with the other-side engaging protrusion.

4. The heat exchanger for a refrigerator according to claim 1 , further comprising a cold storage unit disposed in a gap between the opposing flat tubes.

5. 2. The heat exchanger for a refrigerator according to claim 1, wherein the surfaces of the fins are subjected to a hydrophilic treatment.

6. A refrigerator comprising the heat exchanger according to any one of claims 1 to 5.

7. The heat exchanger for a refrigerator according to any one of claims 1 to 5, A brazing paint is applied to each of the one-side header and the other-side header, and the brazing is performed in a furnace. The one-side inner member, the one-side outer member, and the one-side flow passage forming member in the one-side header are heat-welded, and the one-side opening of the one-side inner member and the one-side end portion of the flat tube are heat-welded, A manufacturing method for a heat exchanger for a refrigerator, characterized in that the other-side inner member, the other-side outer member, and the other-side flow path forming member in the other-side header are heat-welded, and the other-side opening of the other-side inner member and the other-side end of the flat tube are heat-welded.

8. A brazing paint is applied to the surface of the flat tube, and the flat tube is brazed in a furnace. The method for manufacturing a heat exchanger for a refrigerator according to claim 7, wherein the flat tubes and the fins are thermally welded together.

9. The refrigerator heat exchanger further includes a cold storage unit disposed in a gap between the opposing flat tubes, A brazing paint is applied to the surface of the flat tube, and the flat tube is brazed in a furnace. The method for manufacturing a heat exchanger for a refrigerator according to claim 7, wherein the flat tube and a cold storage container of the cold storage unit are heat-welded to each other.

10. 10. The method for manufacturing a heat exchanger for a refrigerator according to claim 7, wherein the brazing paint contains silicon particles, a noncorrosive flux, and a binder resin.

11. The method of claim 10, wherein the brazing paint further comprises zinc particles.

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