JPH04148191A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the generation of a gap between the outer peripheral surface of a combustion cylinder and a refrigerant passage member by a method wherein an inflated part is provided on either outside or inside of a heat transfer bulkhead and a high-temperature gas flow regulating member is brazed to one surface of the top wall of the inflated part while the refrigerant passage member is brazed to the other surface of the same. CONSTITUTION:A heat exchanger can be manufactured by a method wherein a heat transfer bulkhead 3 is placed in horizontal condition, a refrigerant passage member 5, whose both ends are bent upward, is arranged along the upper surface of the top wall 11a of an inflated part 11, high-temperature gas flow regulating members 12, 13 are arranged along the lower surface of the same, then, the heat transfer bulkhead 3, the refrigerant passage member 5 and the high-temperature gas flow regulating members 12, 13 are fixed by a jig and, thereafter, the heat transfer bulkhead 3, the refrigerant passage member 5 and the high-temperature gas flow regulating members 12, 13 are brazed respectively. Accordingly, the fixing work is simplified by the jig and the heat transfer bulkhead 3 and the refrigerant passage member 5 are fixed under the condition of contacting closely. On the other hand, the heat transfer bulkhead 3 is provided with the inflated part 11 whereby the peripheral rims of the heat transfer bulkhead 3, softened by the heat of brazing upon brazing, can be prevented from warping downward by the gravity of the same.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat exchanger used in an air-conditioning device that is used for air conditioning in the summer and heating in the winter, and more specifically relates to a Freon, etc., which is used as a refrigerant for commercial purposes, is heated and evaporated using the combustion heat of an oil or gas burner in the winter, and the latent heat is used to heat the refrigerant using the combustion heat of the burner. Regarding heat exchangers used for

In this specification, the term "aluminum" refers to
It includes aluminum alloys in addition to pure aluminum.

BACKGROUND TECHNOLOGY As shown in Fig. 9, such a heating and cooling system is
A heat exchanger (40) that heats a refrigerant with combustion gas, a radiator (41), a sealed pipe line (42) that connects the heat exchanger (40) and the heat radiator (41), and a sealed pipe line ( A refrigerant conveying machine (43) that is installed in the middle of the refrigerant (42) and forcibly circulates the refrigerant.
) is used.

Conventionally, as a heat exchanger for such an air conditioning system, the first
As shown in Figure 0, a through hole (51) extending in the axial direction of the combustion chamber (50) is provided in the peripheral wall (50a) of the cylindrical combustion chamber (0) made of extruded aluminum material, which serves as the internal combustion chamber. A plurality of combustion cylinders (50) are formed at predetermined intervals in the direction.
A plurality of fins (52) extending longitudinally on the inner surface of the peripheral wall (50a) are integrally formed at predetermined intervals in the circumferential direction, and straight pipe portions of a plurality of hairpin-shaped refrigerant flow pipes (53) are adjacent to each other. are inserted into the through holes (51), and the hairpin-shaped cold air flow pipes (53) are connected by U-shaped connecting pipes (54);
A burner (55) was attached to the opening at one end of the cooking cylinder (50).

Problem to be Solved by the Invention However, in the conventional heat exchanger described above, the refrigerant passage is bent into a U shape at the bent portion of the refrigerant flow pipe (53) and the connecting pipe (4). However, there was a problem in that the pressure loss increased. Another problem was that the cross-sectional area of the refrigerant passage was small.

Therefore, as a heat exchanger that solves the above problem, it has an aluminum cylindrical combustion shell and multiple refrigerant passages inside.
It has also been proposed that the refrigerant passage member is provided with an aluminum circular arc tubular refrigerant passage member that is brought into close contact with the outer peripheral surface of the combustion cylinder and brazed to the combustion cylinder so that the refrigerant passage extends in the circumferential direction or in the axial direction of the combustion cylinder. (Utility Model Application Publication No. 63-97066). Although this heat exchanger can solve the problems of the conventional heat exchanger described above, it is thought that the following problems will occur. In other words, since the combustion shell is cylindrical and the refrigerant passage member is arcuate, manufacturing such a heat exchanger requires many jigs with complex structures and requires a lot of jigs. There is a problem in that the work of fixing the combustion shell and the refrigerant passage member using the tool becomes troublesome. In addition, it is not possible to completely bring the combustion shell and refrigerant passage member into close contact when fixing with a jig, and as a result, a gap may be formed between the outer peripheral surface of the combustion shell and the refrigerant passage member in the manufactured heat exchanger. It is unavoidable. And if such a gap exists,
Heat transfer efficiency decreases. Also, if the above gap exists,
If pitting corrosion occurs on the wall of the refrigerant passage member on the combustion cylinder side, refrigerant such as Freon will leak and enter the gap.
This causes pitting corrosion on the combustion shell. As a result, the freons enter the combustion chamber, and the freons and combustion gas react to generate toxic gases.

An object of the present invention is to provide a heat exchanger that solves all of the above problems.

Means for Solving the Problems The heat exchanger according to the present invention includes a cylindrical combustion cylinder to which a burner is attached at one end, an aluminum heat transfer partition wall that closes an opening at the other end of the combustion cylinder, and a heat transfer partition wall that includes a wax on the inner surface of the heat transfer partition wall. The attached high temperature gas flow regulating member is brazed to the outer surface of the heat transfer partition,
The brazing material is composed of an aluminum flat tubular refrigerant passage member having a plurality of refrigerant passages inside, and an aluminum header attached to both sides of the refrigerant passage member, and a heat transfer partition wall covers a core material and both sides of the core material. It is formed of an aluminum brazing sheet made of leather material, and the heat transfer partition wall is provided with a bulge that bulges out either inside or outside except for a frame-like predetermined width portion around the periphery, and the top wall of the bulge A high temperature gas flow regulating member is brazed to one surface, and a refrigerant passage member is brazed to the other surface.

According to the heat exchanger of the present invention, the heat transfer partition wall is in a horizontal state, and the refrigerant passage member whose both ends are bent upward is placed along the soil surface of the top wall of the bulging portion, and the high temperature gas is placed on the lower surface of the refrigerant passage member. By aligning the flow regulating member, then fixing the heat transfer partition, the refrigerant passage member, and the high temperature gas flow regulation member with a jig, and brazing the heat transfer partition, the refrigerant passage member, and the high temperature gas flow regulation member, respectively. Since these parts can be manufactured easily, a brazing jig with a simple structure can be used to fix these parts for brazing, and the number of brazing jigs can be reduced. Therefore, the fixing work using the jig becomes easy, and since the heat transfer partition wall and the refrigerant passage member are fixed in close contact with each other using the jig, the brazing between the two is performed reliably, and a gap is created between the two. is prevented.

In addition, since the heat transfer partition wall is provided with a bulge portion that bulges out either inside or outside except for a frame-shaped predetermined width portion of the periphery, the heat transfer partition wall, the refrigerant passage member, and the hot gas When brazing with the flow regulating member, the heat softens and prevents the peripheral edge of the heat transfer partition wall from warping downward due to gravity. If such warpage occurs, the brazing material will accumulate at the tip, and if the cylindrical combustion shell is installed on the side to which the high-temperature gas flow regulating member is brazed, the tight contact between the heat transfer partition wall and the combustion shell may be reduced. There is a risk that performance may decrease and exhaust gas leakage may occur.

Example Embodiments of the present invention will be described below with reference to the drawings.

In the following description, the front and back are based on FIG. 3, the front refers to the upper side of FIG. 3, and the rear refers to the opposite side. In addition, except when explaining the manufacturing method, up and down, left and right refer to the top and bottom, left and right of FIG. 2.

1 to 6 show one embodiment of a heat exchanger according to the present invention. In Figures 1 to 6, the heat exchanger (
1) consists of a horizontal cylindrical combustion cylinder (2) with both ends open, a burner (B) attached to the rear end of the combustion cylinder (2) and using oil, gas, etc. as fuel, and the combustion cylinder (2). Heat transfer bulkhead made of aluminum brazing sheet that closes the front end opening (3)
, a high-temperature gas passage (4) formed inside the heat transfer partition wall (3), and a plurality of refrigerant passages (6) brazed to the outer surface of the heat transfer partition wall (3) and extending vertically inside the heat transfer partition wall (3). A refrigerant passage member (
5).

The combustion barrel (2) includes a cylindrical part (2a) and an enlarged part (2b) formed at the front end of the cylindrical part (2a), and the inside of the cylindrical part (2a) is a combustion chamber (8). being done. Further, the inner peripheral surface of the cylindrical portion (2a) is covered with a heat insulating material (9).

A hot gas passage (4) is provided within the widened portion (2b). An exhaust port (25) to which an exhaust pipe is connected is formed at the upper end of the expanded portion (2b).

The heat transfer partition wall (3) is formed of a plating sheet made of a core material (3a) and a brazing sawn material (3b) covering both surfaces of the core material (3a), as shown in FIG. The core material (3a) of the praising sheet is zinc 0°9~1.4vt
%, manganese 1.0~1.5wt%, chromium 0.03~
It is made of an aluminum alloy containing 0.12 wt% and the balance consisting of aluminum and unavoidable impurities. The skin material (3b) contains 7.9 to 9.5 νt% silicon and 0.4 νt% iron.
~0.5vt%, zinc 0.5~3vt%, and the balance is aluminum and unavoidable impurities. The zinc content in the skin material (3b) is preferably in the range of 0.9 to 1.4 wt%. The heat transfer partition wall (3) is provided with a bulge (11) that bulges inward except for a frame-shaped predetermined width portion (■0) on its periphery, and the top wall (lla) of the bulge (11) ) is provided with a high-temperature gas passage (4) on its inner surface, and a refrigerant passage member (5) is brazed on its outer surface.

The high-temperature gas passage (4) is equipped with two high-temperature gas flow regulating members (12) and (13) made of extruded aluminum and vertically spaced apart from each other by a predetermined distance. The upper and lower high-temperature gas flow regulating members (12) (13) have left and right side walls (12a) (13a) extending in the vertical direction, and left and right side walls (12), respectively.
a) Rear wall portion (12) connecting the rear edges of (13a)
b) (13b), and left and right side walls (12a) (1
An intermediate wall portion (12c) connecting the central portions of width 3a)
) (13C), and the rear wall part (12b) (13b
) and the intermediate wall portions (12c) (13c), and at right angles to the front surfaces of the intermediate wall portions (12c) (13c).
d) and the second heat transfer fins (12e) (13e) are integrally provided, and both adjacent heat transfer fins (12d) (1
2e) (13d) (13e) and both heat transfer fins (12d) (12e) (13d) (1
3e) and the left and right side walls (12a) and (13a), high-temperature combustion exhaust gas flows through the passage portions (14) and (15).

Rear wall portion (12b) of upper high temperature gas flow regulating member (12)
protrudes outward from the left and right side walls (12a) in the left and right direction, and its tips are bent forward, and between the left and right side walls (12a) and the front bent wall (12f'), the rear wall A third heat transfer fin (12g) that is perpendicular to the front surface of the portion (12b) is integrally provided. The left and right side walls (12a) and the front bent wall (12a)
Passage portion (16) between f) and third fin (12g)
The high-temperature combustion exhaust gas also flows through the engine. The pitch between adjacent heat transfer fins (13cl) (13e) of the lower high temperature gas flow regulating member (I3) is made smaller than that of the upper high temperature gas flow regulating member (12). 13d) It is preferable that the number of (13e) is increased to increase the heat transfer area.

The space between the left and right side walls (12a) (13a) of the upper and lower high temperature gas flow regulating members (12) and (13) reaches to the rear end or the rear edge of the left and right side walls <12a)<1ta), and A gas leak prevention part (17) that prevents exhaust gas from flowing to the side between the high temperature gas flow regulating members (12) and (13).
) is provided. Upper and lower high temperature gas flow regulating members (12
), the tips of the second heat transfer fins (12e) (13e) are brazed to the heat transfer partition wall (3), and the heat transfer partition wall is attached via fixing members (18) extending vertically at both left and right edges. (3) is fixed. The tip of the front bent wall (12f') of the upper high-temperature gas flow regulating member (12) and the tip of the third heat transfer fin (12g) are also brazed to the heat transfer partition (3). As shown in FIG. 5, the fixing member (18) is formed of a plating sheet made of a core material (18a) and a brazing material (18b) covering both sides of the core material (18a). Core material of praising sheet (18a)
is copper 0.05-0.20vt%, manganese 1.0-1
．． It is made of an aluminum alloy containing 5vt% and the remainder consisting of aluminum and unavoidable impurities.

The skin material (18b) contains silicon 8.0 to 10. 0.2 to 0.5 vt% iron, and the balance is aluminum and unavoidable impurities. The fixing member (18) has a transversal simplified shape and includes a first part (I9) that is in close contact with the inner surface of the heat transfer partition (3) and a second part that projects rearward from the mutually opposing edges of this first part (I9). It is composed of two parts (20). The second portion (20) is brought into close contact with the surface facing the center of the width of the left and right side walls (12a) (taa) of the high temperature gas flow regulating members (12) (13). The front edges of the left and right side walls (12a) of the upper high-temperature gas flow regulating member (12) are cut to a predetermined length equal to the thickness of the first portion (19), and a second heat transfer fin (12e) , front bending wall (12
f) and third heat transfer fin (12g) and heat transfer partition (3)
There is no gap between the two. The front edges of the left and right side walls (13a) of the lower high-temperature gas flow regulating member (13) are cut over the entire length by the thickness of the first portion (19), and are connected to the second heat transfer fins (13e). Heat transfer bulkhead (
3) so that there is no gap between the two. Also,
A gas leak prevention portion (17) is integrally provided continuous with the second portion (2o) of the fixing member (18). A rear protrusion (20a) is integrally provided at the lower end of the second portion (20), and this rear protrusion (20a) forms part of the intermediate wall of the lower hot gas flow regulating member (13). It is in contact with the lower end of (13e). Also, in the first part (19),
A plurality of holes (21) are formed at predetermined intervals in the vertical direction, and projections (22) integrally provided on the heat transfer partition wall (3) are fitted into these holes (21). It is brazed to the heat transfer partition wall (3). The protrusion (22) has a transversal simplified shape, and a U-shaped cut is made in the heat transfer partition wall (3).
It is formed by bending the portion surrounded by this notch backward and toward the high temperature gas flow regulating members (12) and (13). The rear bent portion (22a) of the protrusion (22)
), the high temperature gas flow regulating member (12) (13) of the hole (21)
) side edges come into contact with each other, thereby closing the hole (35) formed to form the protrusion (22).

Then, the periphery of the front end of the cylindrical portion (2a) of the combustion barrel (2) is connected to the rear wall portions (
12b) (13b), as well as the rear wall of the expanded portion (2b) and both the upper and lower high temperature gas flow regulating members (
12) A plate-shaped seal (23) is interposed between the rear wall portion (12b) (13b) of (13), and the flange (2C) around the expanded portion (2b) is attached to the frame of the heat transfer partition (3). A high-temperature gas passage (4) is formed by screwing into the predetermined width portion (10). The high-temperature combustion exhaust gas generated in the combustion chamber (8) is passed through the upper and lower high-temperature gas flow regulating members (12).
The high temperature gas flows into the high temperature gas passageway (4) through a communication port (24) formed between (13) and (13). The high temperature gas passage (4) has an upper high temperature gas flow regulating member (12).
The upper high temperature gas flow regulating member (12
) and the upper end of the passage part (14)<18) and the exhaust port (25)
A guide path (26) is provided to communicate with the
The lower hot gas flow regulating member (13) is present on the lower side and on both left and right sides of the lower hot gas flow regulating member (13), and is located at the lower end of the passage portion (15) of the lower high temperature gas flow regulating member (13) and the upper hot gas flow regulating member (
12) and the guide path (27) that communicates with the passage section 16).
) is provided.

Both the upper and lower ends of the refrigerant passage member (5) are bent so as to face horizontally forward, and their tips are connected to the header (2).
8). The bent portion is indicated by (5a).

The lower header (28) is an inlet header, and a refrigerant inlet pipe (29) is connected to its left end. Compressor oil is always dissolved in the refrigerant, and when the refrigerant is heated and vaporized, this oil gradually accumulates, and its viscosity and low heat conductivity inhibit the vaporization and circulation of the refrigerant. An oil drain pipe (30) is connected to the right end of the inlet header (28).

The upper header (28) is an outlet header, and a refrigerant outlet pipe (31) is connected to its left end. Both headers (
28) are provided with elongated holes (3) extending in the axial direction, respectively.
2) is formed, and the bent part (
5a) passes through this elongated hole (32) and connects to the header (28).
) and is brazed to the peripheral wall of the header (28). As shown in FIG. 4, both headers (28) are overlapped with each other on the image side edges of the plating sheet, in which both sides of the core material (28a) are covered with brazing material (28b). A sloped portion (33) is formed, and the praising sheet is formed into a cylindrical shape so that the sloped portions (33) overlap each other to form a header material (34).
4) is formed by brazing the inclined parts (33) together. Brazing of the inclined parts (33) is performed simultaneously with brazing of the header (33), the refrigerant passage member (5), and other members.

In such a configuration, the combustion gas of the burner (B) is
It enters the high-temperature gas passage (4) through the communication port (24) formed between the upper and lower high-temperature gas flow regulating members (12) and (13), and enters the upper high-temperature gas flow regulating member (12) and (13). Flows upward within the passage section (14) and further into the guide path (26).
and is discharged from the exhaust port (25).

Similarly, the gas flows downward in the passage section (15) of the lower high temperature gas flow regulating member (13), and further passes through the guide path (27) to pass through the passage section (15) of the upper high temperature gas flow regulating member (12).
16>, then go through the guideway (26) and enter the exhaust pipe (26).
5) is discharged from. The heat of the exhaust gas is transferred directly or through the heat transfer fins (1) while flowing in the high temperature gas passage (4).
26H12e) (12g) (13d) (13e)
The heat is transmitted to the heat transfer partition wall (3) through the heat transfer partition wall (3) and the peripheral wall of the refrigerant passage member (5) to the refrigerant passage member (5).
It is transmitted to the refrigerant flowing in the refrigerant passage (6).

The refrigerant is heated and vaporized by the combustion heat of the burner (B), and heating is performed using the latent heat.

At this time, the refrigerant is first heated in the lower part of the refrigerant passage member (5) and partially vaporizes, and due to the action of the vaporized refrigerant, it naturally rises within the refrigerant passage (6) and is completely vaporized. The pitch between adjacent heat transfer fins (13d) (13e) of the lower high temperature gas flow regulating member (13),
If the heat transfer area is made smaller than that of the upper high-temperature gas flow regulating member (12), the amount of heat transferred to the refrigerant in the lower part becomes large, and the above-mentioned natural upward force increases.

Hereinafter, a method for manufacturing the heat exchanger (1) will be explained with reference to FIGS. 7 and 8.

Heat transfer bulkhead made of aluminum brazing sheet (3
), a flat tubular refrigerant passage member (5) having a galvanized layer (7), a high-temperature gas flow regulating member (12) (a fixing member (18) made of a 13L aluminum brazing sheet, an aluminum brazing sheet formed into a cylindrical shape) A header material (34) having an elongated hole (32) is prepared in advance.Protrusions (22) are formed in the heat transfer partition wall (3).

Further, a hole (21) is formed in the fixing member (18).

First, by passing the protrusion (22) of the heat transfer partition wall (3) through the hole (21) of the fixing member (18), the fixing member (1
8) is temporarily fixed to the heat transfer partition wall (3). At this time, the protrusion (
The rear bent portion (22a) of the fixing member (18) is brought into contact with the edge of the hole (21) of the fixing member (18) on the high temperature gas flow regulating member (12) (13) side to form a projection (22). Thermal bulkhead (
3) Close the hole (35). Next, the left and right side walls (12a) (13a) are attached to the second part of the fixing member (18).
Both high temperature gas flow regulating members (12) and (13) are arranged so as to be in close contact with the outer surface of the portion (20). At this time, the rear protrusion (
20a) hits the lower end of the intermediate wall (13c), and the gas leak prevention part (17) hits the rear wall (12b) (1
3b) and the intermediate wall portions (12c) (13c). Therefore, the fixing member (18) positions the high temperature gas flow regulating members (12) and (13) in the horizontal and vertical directions. Thereafter, the refrigerant passage member (5) is placed on the opposite surface of the heat transfer partition wall (3), and the tip of the bent part (5a) is inserted into the elongated hole (32) of the header material (34). Fix it using a suitable jig (not shown). Then, the heat transfer partition wall (3), the fixing member (18), the heat transfer partition wall (3)
) and high temperature gas flow regulating members (12) (13), fixing member (18) and high temperature gas flow regulating members (12) (13), heat transfer partition wall (3) and refrigerant passage member (5), header material (34)
) and the refrigerant passage member (5).
and the peripheral edge of the elongated hole (32) are brazed, respectively.

Due to the heating during this brazing process, the zinc contained in the skin material (3b) of the heat transfer partition wall (3) is diffused into the aluminum of the core material (3a), forming a zinc diffusion layer for corrosion protection. It is formed. Further, the galvanized layer (7) formed on the refrigerant passage member (5) is diffused into the aluminum of the refrigerant passage member (5), thereby forming a zinc diffusion layer for corrosion prevention.

Furthermore, due to the function of the bulging portion (11) formed in the heat transfer partition wall (3), the heat transfer partition wall (3) is heated by the above-mentioned brazing process.
is softened and its periphery is prevented from warping downward due to gravity. Finally, the heat exchanger (1) is manufactured by fixing the heat transfer partition (3) to the combustion shell (2).

Effects of the Invention According to the heat exchanger of the present invention, the heat transfer partition wall is placed in a horizontal state, and the refrigerant passage member whose both ends are bent upward is placed along the upper surface of the top wall of the bulging portion, and the refrigerant passage member is A header is placed over the tips of the bent portions at both ends, a high temperature gas flow regulating member is placed along the lower surface of the top wall of the bulging portion, and then the heat transfer partition wall, the refrigerant passage member and the high temperature gas flow regulating member are fixed with a jig, and the heat transfer Since the heat partition wall and the refrigerant passage member, the refrigerant passage member and the header, and the heat transfer partition wall and the high-temperature gas flow regulating member are each brazed, when fixing these parts for brazing, the structure A simple brazing jig can be used, and the number of brazing jigs can be reduced. Therefore, the fixing work using the jig becomes easy. Moreover, since the heat transfer partition wall and the refrigerant passage member are fixed in close contact with each other using the jig, the brazing between the two is performed reliably, and the formation of a gap between the two is prevented. The heat transfer coefficient to the refrigerant passage member is improved.

In addition, even if pitting corrosion occurs in the refrigerant passage members and refrigerant such as Freon leaks, this can cause pitting corrosion in the combustion cylinder, which prevents the generation of toxic gases due to the reaction between Freon and combustion gas. It can be prevented.

In addition, since the heat transfer partition wall is provided with a bulge portion that bulges out either inside or outside except for a frame-shaped predetermined width portion of the periphery, the heat transfer partition wall, the refrigerant passage member, and the hot gas When brazing the flow regulating member, the heat softens the peripheral edge of the heat transfer partition wall and prevents it from warping downward due to gravity, and a cylindrical shape is formed on the side where the high temperature gas flow regulating member is brazed. When the combustion shell is attached, there is a risk that the adhesion between the heat transfer partition wall and the combustion shell may deteriorate and leakage may occur.

[Brief explanation of drawings]

The drawings show an embodiment of the heat exchanger according to the present invention, and FIG. 1 is a partially cutaway perspective view, and FIG. 2 is a partially cutaway view of FIG. 1.
■An enlarged line sectional view, Fig. 3 is an enlarged horizontal sectional view, Fig. 4 is an enlarged cross-sectional view of the header, Fig. 5 is a partially enlarged view of Fig. 3, and Fig. 6 is a heat transfer partition, high temperature gas flow regulation. 7 and 8 are partially enlarged exploded perspective views showing the members and the fixing member.
The manufacturing method of the heat exchanger shown in Fig. 7 is a diagram showing the heat transfer partition wall, refrigerant passage member, high temperature gas flow regulating member, and header before brazing, and Fig. 8 is the same after brazing. FIG. 9 is a schematic diagram showing the air conditioning system, and FIG. 10 is a perspective view showing a conventional example. (1)...Heat exchanger, (2)...Combustion shell, (3)...
...Heat transfer partition wall, (5), ...Flat tubular refrigerant passage member, (
6)...Refrigerant passage, (10)...Frame-shaped predetermined width portion, (11)...Bulging portion, (lla)...Top wall, (12)...
) (13)...High temperature gas flow regulating member, (28)...
Header, (B)...burner. Above 2 So No. 11'G No. 71'4

Claims (1)

[Claims] A cylindrical combustion cylinder to which a burner is attached at one end, an aluminum heat transfer partition that closes the opening at the other end of the combustion cylinder, a high temperature gas flow regulating member brazed to the inner surface of the heat transfer partition, and a heat transfer partition that closes the opening at the other end of the combustion cylinder. It consists of an aluminum flat tubular refrigerant passage member that is brazed on the outside and has a plurality of refrigerant passages inside, and an aluminum header that is attached to both ends of the refrigerant passage member, and the heat transfer partition wall is connected to the core material and the core material. The heat transfer partition wall is formed of an aluminum brazing sheet made of brazing sawn material that covers both sides of the heat transfer partition wall, and the heat transfer partition wall is provided with a bulge portion that bulges out either inside or outside except for a frame-like predetermined width portion around the periphery.
A heat exchanger in which a high temperature gas flow regulating member is brazed to one surface of the top wall of the bulging portion, and a refrigerant passage member is brazed to the other surface.