JP2007127306A - Heat transfer plate member, heat exchanger using the same, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat transfer plate and a heat exchanger using the same, capable of inhibiting progression of corrosion in a brazing filler metal layer itself and to a core material layer, achieving a good balance of brazing property and corrosion resistance, and composed of a thinnable sacrifice corrosion layer, the core material layer and the brazing filler metal layer. <P>SOLUTION: The heat exchanger plate members 1, 12 provided with a number of projecting portions 2, 14 by press molding a plate material of a three-layered structure formed by cladding the brazing filler metal layer 1B on one face of the core material layer 1A of an aluminum material and the sacrifice corrosion layer 1C on the other face, are stacked in a state that the brazing filler metal layers and the sacrifice corrosion layers are alternately adjacent to each other, thus the heat exchanger having an external fluid passage and an internal fluid passage is formed. Here, a material of low electric potential is used as the brazing filler metal of the brazing filler metal layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat transfer plate member formed using an aluminum plate clad in a three-layer structure of a sacrificial corrosion layer, a core material layer, and a brazing material layer, a heat exchanger formed by laminating this plate member, and the heat The present invention relates to a method for manufacturing an exchanger, and is suitable for use in, for example, an evaporator for vehicle air conditioning.

  In a conventional laminated heat exchanger, for example, an automotive air conditioner evaporator, a flat tube formed by joining two plate members in the middle, and a louver for expanding the heat transfer area on the air side. It is formed by alternately laminating corrugated fins. However, in this type of stacked heat exchanger, the presence of corrugated fins is a major obstacle to reducing the cost and size of the heat exchanger.

  Therefore, a heat exchanger that does not require a fin such as a corrugated fin and can ensure a necessary heat transfer performance only by a heat transfer plate member that constitutes an internal fluid passage is disclosed in Patent Document 1 and Patent Document 2 and the like. More known.

JP-A-11-287580 JP 2000-205785 A

  However, the heat exchanger known from Patent Document 1 uses a double-sided clad material in which A4000 series aluminum brazing material is clad on both sides of an A3000 series aluminum core as a heat transfer plate member. is there. Therefore, in a heat exchanger using a heat transfer plate member clad with brazing material on both sides, there is no problem if sufficient corrosion protection is applied by surface treatment, etc. If the anticorrosion treatment is insufficient, there is a problem that it is not easy to use in an environment where corrosion is severe. Or in order to give corrosion resistance to an aluminum core material, it is necessary to make the plate | board thickness of a core material thick, and there exists a problem of causing the raise of material cost.

  Patent Document 2 shows a heat transfer plate member 1 in which an A4000 series aluminum brazing material 1B is clad on one side of an A3000 series aluminum core 1A and a sacrificial corrosion layer 1C is clad on the other side. Has been. However, in the heat exchanger using the heat transfer plate member 1 whose one surface is brazed and the other surface is clad with the sacrificial corrosion layer, for example, as shown in FIG. In the portion 1a to be joined by brazing, the heat transfer plate member 1 is bent into a U-shape at the tank portion 2 so that the brazing material surfaces of the heat transfer plate member 1 face each other, and brazing is performed at this portion 1a. is doing. Therefore, there is a problem that the U-shaped processing of the tank part 2 is not easy to process and the manufacturing cost tends to be expensive. Moreover, there exists a problem that sufficient corrosion resistance cannot be ensured.

  Furthermore, Patent Document 2 also shows a heat exchanger in which the tank portion 2 is not U-shaped as shown in FIG. 10, but in this case also, the heat transfer plate member 1 is replaced by a brazing material surface. Since the sacrificial corrosion layers face each other because they are arranged so as to face each other, a plate member 3 in which both sides formed as separate parts are clad with a brazing material is interposed in such a place. The brazing is carried out. For this reason, there is a problem that separate parts are required, the manufacturing cost is likely to be expensive, and the number of parts is increased.

  The present invention has been made in view of the above-mentioned problems, and the object thereof is to suppress the progress of corrosion of the brazing material layer itself to the core material layer, to ensure the brazing property and to improve the corrosion resistance. It can be made with an aluminum plate clad with a three-layer structure consisting of a sacrificial corrosion layer, a core material layer, and a brazing material layer, which can reduce the thickness of the core material, and hence the heat transfer plate member itself. The present invention provides a heat exchanger plate member, a heat exchanger in which the heat exchanger plate members are laminated and formed by brazing, and a manufacturing method thereof.

The present invention provides a heat transfer plate member, a heat exchanger, and a heat exchanger manufacturing method according to each of the claims as means for solving the problems.
The heat transfer plate member according to claim 1 has a three-layer structure in which a low potential brazing material layer 1B is clad on one side of a core material layer 1A made of an aluminum material and a sacrificial corrosion layer 1C is clad on the other side. As the brazing material of the brazing material layer 1B, an alloy of any one of an Al—Si alloy, an Al—Si—Zn alloy, and an Al—Si—Mn—Zn alloy is adopted, and the sacrificial corrosion layer 1C is an Al—Zn alloy or It is composed of an Al—Zn—Mn alloy, which can ensure both brazing and corrosion resistance, and the brazing material itself has a low potential. The progress of corrosion can be suppressed. Moreover, in addition to the thin wall effect by the single-sided clad of the brazing material, the core material layer 1A can be thinned by improving the corrosion resistance by the sacrificial corrosion layer 1C, so that the thickness of the heat transfer plate member itself can be reduced.

  The heat exchanger according to claim 2 is a heat transfer plate in which a plate material having a three-layer structure in which a brazing material layer 1B having a low potential is clad on one side of an aluminum core material layer 1A and a sacrificial corrosion layer 1C is clad on the other side. The heat exchanger 10 is formed by laminating members 1 and 12, and the heat transfer plate members 1 and 12 include heat transfer promotion structures 2 and 14 for the external fluid OF and flow path structures 2 and 14 for the internal fluid IF. The heat transfer plate members 1 and 12 are laminated so that the sacrificial corrosion layers 1C and the brazing material layers 1B are alternately adjacent to each other. Convex shapes 2 and 14 are formed on one or both of the heat transfer plate members 1 and 12 so that the heat transfer surface and the external fluid heat transfer surface of the other heat transfer plate member 1 and 12 adjacent to each other are partially in contact with each other. This ensures brazability. Can, it is possible to obtain a heat exchanger 10 with improved corrosion resistance.

The heat exchanger according to claim 3 specifies that the sacrificial corrosion layer 1C is composed of an Al—Zn alloy or an Al—Zn—Mn alloy. This is also for assisting the corrosion resistance of the brazing filler metal layer 1B by Zn flying from the sacrificial corrosion layer 1C.
In the heat exchanger of claim 4, the chemical components of the material of the sacrificial corrosion layer 1C are Zn: 1.5-5.0 mass% and Mn: 2.0 mass% or less. This is because 1.5 to 5.0% by mass of Zn is required to fly Zn from the sacrificial corrosion layer 1C to the brazing material layer.

The heat exchanger according to claim 5 employs any one of an Al-Si alloy, an Al-Si-Zn alloy, and an Al-Si-Mn-Zn alloy as the brazing material for the brazing material layer 1B. Thus, by setting the brazing material to a base natural potential, the corrosion resistance of the brazing material layer 1B itself can be improved.
The heat exchanger of claim 6 is such that fins are not provided in the portion through which the external fluid OF passes, and the present invention is particularly effective for the finless type stacked heat exchanger.

  The method of manufacturing a heat exchanger according to claim 7 includes a heat exchanger 10 formed by laminating heat transfer plate members 1 and 12 having a three-layer structure of a brazing material layer 1B, a core material layer 1A, and a sacrificial corrosion layer 1C. The heat transfer plate members 1 and 12 are integrally molded with the heat transfer promotion structures 2 and 14 for the external fluid OF and the flow structures 2 and 14 for the internal fluid IF, and the forming process. The laminated heat transfer plate members 1 and 12 are laminated so that the sacrificial corrosion layer 1C and the brazing filler metal layer 1B are adjacent to each other, and the obtained laminated body is temporarily held by a jig, and the temporarily held lamination Carrying the body into a heating furnace and heating and brazing. As a result, it is possible to provide a heat exchanger that can secure brazing and improve corrosion resistance, and can reduce the number of parts and the manufacturing cost.

  Hereinafter, a heat transfer plate member according to an embodiment of the present invention, a heat exchanger using the heat transfer plate member, and a manufacturing method thereof will be described with reference to the drawings. FIG. 1 is an enlarged view of a brazed portion of the heat transfer plate member of the present invention, and FIG. 2 is a view showing a laminated state of the heat transfer plate member. The heat transfer plate member 1 of the present invention has an aluminum material (including an aluminum alloy) as a core material layer 1A, and a brazing material layer 1B is clad on one side and a sacrificial corrosion layer 1C is clad on the other side. It consists of a plate material with a three-layer structure. The heat transfer plate member 1 is formed with a plurality of convex portions 2 punched out by pressing. The convex portion 11 serves as a heat transfer promotion structure with the external fluid OF and also serves as a flow path structure for the internal fluid IF.

In FIG. 1, the upper heat transfer plate member 1 is formed with a convex portion 2 so as to be pushed out from the brazing material layer 1B side, and the lower heat transfer plate member 1 is pushed out from the sacrificial corrosion layer 1C side. Convex part 2 is formed. That is, two types of heat transfer plate members 1 are prepared. Thus, the two heat transfer plates 1 are overlapped and brazed so that the convex portions 2 come into contact with each other. Therefore, the two types of heat transfer plate members 1 are superposed such that the sacrificial corrosion layer 1C and the brazing material layer 1B are adjacent to each other.
FIG. 2 shows a state in which the two types of heat transfer plate members 1 are alternately stacked to form a heat exchange core. In this case, the external fluid OF, for example, air flows from the upper side to the lower side of the drawing, and the internal fluid IF, for example, the refrigerant flows in a direction penetrating the paper surface from the front side to the back side. That is, the external fluid OF and the internal fluid IF are in a cross flow.

  FIG. 3 shows a heat transfer plate member (a) and a laminated state (b) of another embodiment. In the heat transfer plate member 1, a plurality of convex portions 2 and 3 are formed on both the external fluid OF side and the internal fluid IF side. In this case, in order to obtain the laminated state shown in FIG. 3 (b), another flat heat transfer plate member 1 'having no projections 11 and 12 is required and having projections 2 and 3. The heat transfer plate members 1 and the flat plate heat transfer plate members 1 'are alternately laminated to form a heat exchange core. Also in this other embodiment, the two types of heat transfer plate members 1 and 1 'each have a three-layer structure of a brazing material layer 1B, a core material layer 1A and a sacrificial corrosion layer 1C. The brazing material layer 1B is laminated adjacently. Moreover, it is preferable that the space | interval between each convex part 2 or 3 shall be 10 mm or less. Thereby, the anticorrosion effect by the sacrificial corrosion layer 1C on one side can be exerted on the opposite surface. In this embodiment, the internal fluid IF and the external fluid OF are counterflows. Moreover, it can replace with flat plate-shaped heat-transfer plate member 1 ', and can also be set as the heat-transfer plate member which changed the direction where the convex parts 2 and 3 are extruded like the previous Example.

  4-7 shows the heat exchanger of embodiment using the heat-transfer plate member of this invention, and has shown the example which applied this invention to the evaporator 10 for vehicle air conditioning. The evaporator 10 is configured as a cross-flow heat exchanger in which the flow direction of the air-conditioning air that is the external fluid OF and the flow direction of the refrigerant in the refrigeration cycle that is the internal fluid IF are orthogonal to each other. The evaporator 10 includes a heat exchange core 11 that performs heat exchange between air-conditioning air and a refrigerant by laminating and brazing a plurality of heat transfer plate members 12 having the same shape. Here, the same shape means that the same convex portion is formed. As understood from FIG. 4, two types of the same convex portion are formed as described above. A heat transfer plate is used.

  The heat transfer plate member 12 is formed by press-molding a plate material having a three-layer structure in which a brazing material layer is clad on one surface of a core material layer of an aluminum material (including an aluminum alloy) and a sacrificial corrosion layer is clad on the other surface. It is what. That is, the heat transfer plate member 12 has a large number of convex portions 14 that are punched out from the flat substrate portion 13 into a thin shape. These convex portions 14 are formed at a predetermined angle with respect to the flow direction of the air-conditioning air that is the external fluid OF, and are formed in two rows before and after the flow direction of the air-conditioning air. Are formed.

  In the heat transfer plate member 12 that is a set of two sheets, the convex portion 14 of the other heat transfer plate member 12 is rotated 180 degrees with respect to the convex portion 14 of the one heat transfer plate member 12 (in the reverse direction). (Tilt) shape. In this way, the heat exchange core member 11 is formed by stacking the heat transfer plate members 12 in pairs. In this case, each heat transfer plate member 12 is disposed so that the sacrificial corrosion layers and the brazing material layers are alternately adjacent to each other. In this way, as shown in FIG. 5, the convex portion 14 of the heat transfer plate member 12 forms a zigzag internal fluid passage through which the refrigerant that is the internal fluid IF flows, and air conditioning air that is the external fluid OF. Forms a twill-like passage that flows in a complicated manner. Therefore, the convex portion 14 of the heat transfer plate member 12 has both functions of a heat transfer promotion structure with the external fluid OF and a flow path structure of the internal fluid IF.

Further, the heat transfer plate member 12 has two tank portions 15 to 18 corresponding to the two rows of convex portions at both ends in the longitudinal direction (direction perpendicular to the flow direction of air-conditioning air). Is formed. The tank portions 15 to 18 are formed in a circular shape or an oval shape, and are formed by a hook-like protruding portion that is stamped and formed in the same direction as the convex portion 14, and communication holes 15 a to 18 a are opened in the center portion. Yes. The communication holes 15a to 18a are for communication between the refrigerant passages.
Among the multiple convex portions 14, the convex portions 14 at both ends adjacent to the tank portions 15 to 18 communicate with the concave spaces of the respective tank portions 15 to 18 in the interior of the concave portions. The heat transfer plate member 12 is laminated and joined so that the concave surfaces and the convex surfaces of the convex portion 14 and the tank portions 15 to 18 come into contact with each other. Here, the pair of heat transfer plate members 12 that are arranged so that the convex portions face outward and the concave surfaces come into contact with each other, as shown in FIG. 5, the slender convex portions 14 of each other incline in the opposite direction. And joined in a crossed state.

  Intersections of the projections 14, that is, overlapping portions, are connected to each other between the internal spaces of the projections 14, thereby forming zigzag refrigerant passages 19 and 20. The refrigerant passage 19 is a refrigerant passage on the downstream side of the air that communicates between the tank portions 15 and 16 on the downstream side in the air flow direction, and the refrigerant passage 20 is between the tank portions 17 and 18 on the upstream side in the air flow direction. This is a refrigerant passage on the air upstream side that communicates with each other. Therefore, two rows of refrigerant passages 19 and 20 for allowing the refrigerant as the internal fluid IF to flow in a direction orthogonal to the air flow direction are constituted by the two rows of convex portions located before and after the air flow direction. The two rows of refrigerant passages 19 and 20 are separated by a joint portion between the substrate portions 13 located at the center portion C in the width direction of the heat transfer plate member 12.

  The heat exchange core 11 is configured by laminating and joining a set of two heat transfer plate members 12 constituting the refrigerant passages 19 and 20. Flat end plates 21 and 22 having the same size as the heat transfer plate member 12 are disposed on both ends in the stacking direction of the heat transfer plate member 12. In FIG. 4, the left end plate 21 is connected with a refrigerant inlet pipe 23 that communicates with the lower air downstream tank section 15 and a refrigerant outlet pipe 24 that communicates with the upstream air upstream tank section 18. Yes.

  Also, the right end plate 22 in FIG. 4 is formed with a communication hole 22a that communicates with the lower air downstream tank portion 15 and a communication hole 22b that communicates with the upper air upstream tank portion 18. A side plate 25 is further joined to the outer surface of the end plate 22. The side plate 25 is press-molded into a concave shape. By joining the side plate 25 to the end plate 22, a refrigerant passage 26 is formed between the side plate 25 and the end plate 22 as shown in FIGS. The refrigerant passage 26 communicates between the lower air downstream tank portion 15 and the upper air upstream tank portion 18 through the communication holes 22a and 22b. In this case, a partition (not shown) is provided at the center of the air downstream tank 15 and the air upstream tank 18. As a result, a refrigerant passage that flows in an inverted U shape on the downstream side of the air is formed, and a refrigerant passage that flows in a U shape on the upstream side of the air is formed.

  The evaporator 10 of this embodiment is comprised as mentioned above, The manufacture is performed as follows. First, a convex portion 14 having both functions of a heat transfer promotion structure and a flow path structure is processed by press molding on a heat transfer plate member 12 having a three-layer structure of a brazing material layer, a core material layer, and a sacrificial corrosion layer. At this time, the side plate 25 is similarly pressed. The two heat transfer plate members 12 are stacked and disposed so that the sacrificial corrosion layers and the brazing material layers are alternately adjacent to each other, and other components such as the end plates 21 and 22 and the side plate 25 are also assembled. Then, this laminated state (assembled state) is temporarily held by an appropriate jig and carried into a brazing heating furnace. By heating the assembly (laminate) to the melting point of the brazing material in a heating furnace, the assembly is brazed together. Remove the assembly from the heating furnace and remove the jig. Thereby, the assembly (manufacture) of the evaporator 10 can be completed.

  Next, the operation of the evaporator 10 of this embodiment will be described. The gas-liquid two-phase refrigerant on the refrigeration cycle low pressure side, which is the internal fluid IF, first flows in a zigzag shape in the air downstream side refrigerant passage 19 and in an inverted U shape as a whole in accordance with the above-described passage configuration. The refrigerant flows through the refrigerant passage 26 in a zigzag manner and as a whole in a U-shape. On the other hand, the conditioned air that is the external fluid OF is meandering in a wavy manner in the gap formed between the convex portions 14 protruding to the outer surface side of the heat transfer plate member 12 of the heat exchange core 11 as shown in FIG. Flowing. Since the refrigerant absorbs the latent heat of vaporization and evaporates from the air flow, the conditioned air is cooled and becomes cold air.

  At this time, with respect to the flow direction of the conditioned air, the refrigerant inlet side heat exchange unit is formed on the downstream side of the air, and the refrigerant outlet side heat exchange unit is formed on the upstream side of the air. The flow direction of the refrigerant is made to coincide in the outlet side heat exchange section. With such a refrigerant passage configuration, even if the liquid-phase refrigerant and the gas-phase refrigerant of the gas-liquid two-phase refrigerant are distributed to the refrigerant passages 19 and 20 to some extent unevenly, the blowout of the conditioned air evaporator The air temperature can be made uniform over the entire area of the evaporator 10. Further, the refrigerant forms a flow that is three-dimensionally changed in a zigzag and U shape in the refrigerant passages 19 and 20 and disturbs the flow, so that the heat transfer coefficient on the refrigerant side can be increased.

  On the other hand, on the air side, the elongated projections 14 form a heat transfer surface crossed orthogonally, so that air flows along the heat transfer surface crossed orthogonally and is prevented from going straight. For this reason, as shown in FIG. 5, the air flow forms a complicatedly meandering flow in the plane direction of the heat transfer plate member 12. At the same time, as shown in FIG. 7, the air OF forms a meandering flow in the laminating direction of the heat transfer plate member 12. As a result, the air OF forms a flow which is three-dimensionally changed in the air passage formed by the convex gap toward the outer surface by the convex portion 14 of the heat transfer plate member 12, and disturbs the flow. It becomes a flow state, and the heat transfer coefficient on the air side can be dramatically improved.

In the present invention, the heat exchanger plate (evaporator) of the embodiment shown in FIGS. 4 to 7 is manufactured by brazing using a fluoride flux by changing the chemical composition of the material of the heat transfer plate member having a three-layer structure. Corrosion tests were performed using various heat exchanger samples. The evaluation results are shown in the table of FIG.
This corrosion test was performed under the following conditions.
As the immersion liquid, a liquid containing Cl ion 6000 ppm + SO ₄ ion 200 ppm + Cu ion 10 ppm was used, and as the spray liquid, a pH 3 liquid containing Cl ion 3000 ppm + SO ₄ ion 1360 ppm was used. Further, the heat transfer plate member of the heat exchanger is a plate having a thickness of 0.2 mm and a clad rate of 20% sacrificial corrosion layer and 15% brazing material layer.
As a test method, first, after being immersed in the immersion liquid for 24 hours, a cycle spray test using the spray liquid was performed.
The cycle test conditions are: spray 50 ° C. 1.5 h → dry 50 ° C. 1 h → wet 50 ° C. 1.5 h.
The test results (evaluation results) are shown in the table of FIG. In this table, the remainder of the chemical component is Al + impurities.

From this table, the sacrificial corrosion layer surface showed good corrosion resistance for all the evaluated samples. In addition, the brazing material layer surface showed good corrosion resistance if Zn was added to the brazing material, but if Zn was not added, it depends on the flying of Zn from the sacrificial corrosion layer. The addition of 1.5 to 5.0% by mass was necessary.
Therefore, in the present invention, an Al—Zn alloy or an Al—Zn—Mn alloy can be adopted as the material of the sacrificial corrosion layer, and the chemical component thereof is 1.5 to 5.0 mass% of Zn. , Mn is preferably 2.0% by mass or less.
As a material for the brazing material layer, a low base potential is suitable, and an Al—Si alloy, an Al—Si—Zn alloy, an Al—Si—Mn—Zn alloy, or the like can be used.

It is an enlarged view of the brazing part of the heat-transfer plate member by embodiment of this invention. It is a figure which shows the state which laminated | stacked the heat-transfer plate member. It is a figure which shows the heat-transfer plate member (a) of another embodiment, and its lamination | stacking state (b). It is a disassembled perspective view which shows the heat exchanger of embodiment of this invention using the heat-transfer plate member of another embodiment. It is a figure which shows the superposition | polymerization state of two heat-transfer plate members using the heat exchanger of FIG. It is XX sectional drawing of FIG. FIG. 6 is a YY sectional view of FIG. 5. It is a table | surface which shows the evaluation result which performed the corrosion test using the various heat exchanger samples manufactured by the brazing method using a fluoride flux, changing the heat-transfer plate member. It is a figure which shows the heat exchange core which uses the conventional heat-transfer plate member. It is a figure which shows the heat exchange core which uses the conventional heat-transfer plate member.

Explanation of symbols

1,12 Heat transfer plate member 1A Core material layer 1B Brazing material layer 1C Sacrificial corrosion layer 2,14 Convex portion 10 Heat exchanger (evaporator)
OF External fluid (Air for air conditioning)
IF internal fluid (refrigerant)

Claims (7)

A heat transfer plate member (1, 12) having a three-layer structure in which a low potential brazing material layer (1B) is clad on one side of a core material layer (1A) made of an aluminum material and a sacrificial corrosion layer (1C) is clad on the other side. In
As the brazing filler metal layer (1B), an Al-Si alloy, an Al-Si-Zn alloy, or an Al-Si-Mn-Zn alloy is employed,
The heat transfer plate member, wherein the sacrificial corrosion layer (1C) is made of an Al-Zn alloy or an Al-Zn-Mn alloy. A heat transfer plate member formed by molding a three-layer plate material in which a low-potential brazing material layer (1B) is clad on one surface of a core material layer (1A) made of an aluminum material and a sacrificial corrosion layer (1C) is clad on the other surface ( 1, 12) In the heat exchanger (10) formed by stacking,
The heat transfer plate member (1, 12) is integrally formed with a heat transfer promoting structure (2, 14) for the external fluid (OF) and a flow path structure (2, 14) for the internal fluid (IF). The heat transfer plate members (1, 12) are laminated so that the sacrificial corrosion layers (1C) and the brazing material layers (1B) are alternately adjacent to each other, and the heat transfer plate members (1, 1) are arranged. 12) one or both of the heat transfer plate members (1) so that the external fluid heat transfer surface of 12) and the external fluid heat transfer surface of the other heat transfer plate member (1, 12) adjacent to each other are partially in contact with each other. , 12) and a convex shape (2, 14) are formed.   The heat exchanger according to claim 2, wherein the sacrificial corrosion layer (1C) is made of an Al-Zn alloy or an Al-Zn-Mn alloy.   4. The heat exchange according to claim 3, wherein the chemical component of the material of the sacrificial corrosion layer (1 </ b> C) is Zn: 1.5 to 5.0 mass% and Mn: 2.0 mass% or less. vessel.   The brazing material of the brazing material layer (1B) is an Al-Si alloy, an Al-Si-Zn alloy or an Al-Si-Mn-Zn alloy. The heat exchanger according to 3 or 4.   The heat exchanger according to any one of claims 2 to 5, wherein a fin is not provided in a portion through which the external fluid (OF) passes. A heat transfer plate member (1, 12) having a three-layer structure in which a low potential brazing material layer (1B) is clad on one side of a core material layer (1A) made of an aluminum material and a sacrificial corrosion layer (1C) is clad on the other side. The manufacturing method of the heat exchanger (10) formed by laminating the following steps:
The heat transfer plate member (1, 12) is integrally molded with a heat transfer promoting structure (2, 14) with an external fluid (OF) and a flow path structure (2, 14) with an internal fluid (IF). When,
The formed heat transfer plate members (1, 12) are laminated so that the sacrificial corrosion layers (1C) and the brazing filler metal layers (1B) are alternately adjacent to each other, and the obtained laminated body is used with a jig. A temporary holding stage;
Carrying the temporarily held laminate into a heating furnace, heating and brazing, and
The manufacturing method of the heat exchanger characterized by including.

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