JP2863867B2 - Heat exchanger manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat exchanger used for a cooling and heating device used for cooling in summer and for heating in winter, for example. In a cooling / heating device that heats and evaporates freon or the like used as a cooling medium in summer by the heat of combustion of an oil burner or gas burner in winter, and uses the latent heat to heat the refrigerant, the refrigerant burns the burner. The present invention relates to a method for manufacturing a heat exchanger used for heating by heat.

In this specification, the term “aluminum” includes an aluminum alloy in addition to pure aluminum.

2. Description of the Related Art As such a cooling and heating device, as shown in FIG. 8, a heat exchanger (40) for heating a refrigerant by a combustion gas,
A radiator (41), a sealed pipe (42) connecting the heat exchanger (40) and the radiator (41), and a refrigerant carrier for forcibly circulating a refrigerant provided in the middle of the sealed pipe (42). (43) is used.

Conventionally, as a heat exchanger of such a cooling and heating device, as shown in FIG. 9, a combustion cylinder (50a) of a cylindrical combustion cylinder (50) made of an extruded aluminum material having an internal combustion chamber is provided. A plurality of through-holes (51) extending in the axial direction of (50) are formed at predetermined intervals in the circumferential direction, and a plurality of fins (52) extending in the longitudinal direction are formed on the inner surface of the peripheral wall (50a) of the combustion cylinder (50).
Are formed integrally at predetermined intervals in the circumferential direction, and the straight pipe portions of the plurality of hairpin-shaped refrigerant flow pipes (53) are inserted into adjacent through holes (51), and each hairpin-shaped refrigerant flow pipe ( Five
3) was connected by a U-shaped connecting pipe (54), and a burner (55) was used at one end opening of the combustion cylinder (50).

Problems to be Solved by the Invention However, in the above-described conventional heat exchanger, the passage of the refrigerant is bent into a U-shape at the bent portion of the refrigerant flow pipe (53) and at the connecting pipe (54). However, there is a problem that the pressure loss increases. Further, there is a problem that the sectional area of the refrigerant passage is small.

Therefore, as a heat exchanger that solves the above problem, an aluminum cylindrical combustion cylinder and a plurality of refrigerant passages therein, and the combustion passage of the combustion cylinder is extended in the circumferential direction or the axial direction of the combustion cylinder. There has been proposed an aluminum arc-shaped tubular refrigerant passage member closely adhered to an outer peripheral surface and brazed to a combustion cylinder (Japanese Utility Model Laid-Open No. 63-97066). With this heat exchanger, the above-mentioned problems of the conventional heat exchanger can be solved, but the following problems are considered to occur. That is, since the combustion cylinder has a cylindrical shape and the refrigerant passage member has an arc shape, a large number of jigs having a plurality of structures are required to manufacture such a heat exchanger. There is a problem that the fixing work between the combustion cylinder and the refrigerant passage member is troublesome. Further, when fixed by the jig, the combustion cylinder and the refrigerant passage member cannot be completely brought into close contact with each other, and as a result, a gap is formed between the outer peripheral surface of the combustion cylinder and the refrigerant passage member in the manufactured heat exchanger. Inevitable. And when such a gap exists,
The heat transfer efficiency decreases. Also, if the above gap exists,
When pitting corrosion occurs on the combustion cylinder side wall of the refrigerant passage member, refrigerant such as freon leaks and enters the gap,
This causes pitting of the combustion cylinder. As a result, the freon enters the combustion cylinder, and the freon and the combustion gas react to generate toxic gas.

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

Means for Solving the Problems A method for manufacturing a heat exchanger according to the present invention comprises a cylindrical combustion cylinder having a burner attached at one end, an aluminum heat transfer partition for closing the other end opening of the combustion cylinder, and a heat transfer partition. A high-temperature gas flow regulating member brazed to the inner surface, an aluminum flat tubular refrigerant passage member brazed to the outer surface of the heat transfer partition and having a plurality of refrigerant passages therein, and attached to both ends of the refrigerant passage member A method of manufacturing a heat exchanger comprising an aluminum header having a flat tubular refrigerant passage member having both ends bent upward on the upper surface of a heat transfer partition; and A step of placing a header on the ends of the bent portions at both ends, a step of aligning the high-temperature gas flow regulating member on the lower surface of the heat transfer partition, fixing the heat transfer partition, the refrigerant passage member, and the high-temperature gas flow control member with a jig, Heat transfer Wall and the coolant passage member, the coolant passage member and the header, and the heat transfer partition wall and the hot gas flow regulating member each is intended to include a wax subjecting step.

According to the method of the present invention, a brazing jig having a simple structure can be used, and the number of brazing jigs can be reduced. Further, the heat transfer partition and the flat tubular refrigerant passage member are fixed in close contact with each other by the jig, and the brazing of both is reliably performed.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, front and rear, left and right are based on FIG. 2, and the front indicates the upper side of FIG. 2 and the rear indicates the opposite side. In addition, the left indicates the left side of FIG. 2, and the right indicates the opposite side.

1 to 4 show a heat exchanger manufactured by the method of the present invention. In FIGS. 1 to 4, a heat exchanger (1) is a horizontal cylindrical combustion cylinder (2) open at both ends.
A burner (B) attached to the rear end of the combustion cylinder (2) and using oil, gas or the like as a fuel; an aluminum heat transfer partition (3) for closing a front end opening of the combustion cylinder (2); A hot gas passageway (4) formed inside the thermal bulkhead (3);
A flat tube made of an extruded aluminum material having a plurality of refrigerant passages (6) brazed to the outer surface of the heat transfer partition (3) and extending vertically therein and having a galvanized layer (7) formed on the surface. And a refrigerant passage member (5).

The combustion cylinder (2) includes a cylindrical portion (2a) and an enlarged portion (2b) formed at the front end of the cylindrical portion (2a). The inside of the cylindrical portion (2a) is a combustion chamber (8). It has been done. The inner peripheral surface of the cylindrical portion (2a) is covered with a heat insulating material (21). A hot gas passage (4) is provided in the expanding portion (2b).

The heat transfer partition (3) is formed of a brazing sheet comprising a core material (3a) and a brazing material (3b) covering both surfaces of the core material (3a) as shown in FIG. Brazing sheet core material (3a) is zinc 0.9-1.4wt%, manganese 1.
It is formed of an aluminum alloy containing 0 to 1.5 wt% and chromium 0.03 to 0.12 wt%, with the balance being aluminum and unavoidable impurities. Skin material (3b) is silicon 7.9-9.5wt%,
It is made of an aluminum alloy brazing material containing 0.4 to 0.5 wt% of iron and 0.5 to 3 wt% of zinc, the balance being aluminum and unavoidable impurities. The zinc content in the skin material (3b) is 0.
It is preferably in the range of 9 to 1.4 wt%. An exhaust pipe (9) is connected to the upper end of the heat transfer partition (3).

The high-temperature gas passage (4) includes two high-temperature gas flow regulating members (11) made of an extruded aluminum material and arranged at predetermined intervals above and below. Each high-temperature gas flow regulating member (11)
Connects the left and right side walls (11a) extending in the vertical direction, the rear wall (11b) connecting the rear edges of the left and right side walls (11a), and the center of the width of the left and right side walls (11a). An intermediate wall portion (11c) is provided, and a first transmission is formed between the rear wall portion (11b) and the intermediate wall portion (11c) and on the front surface of the intermediate wall portion (11c) so as to form a right angle therewith. Thermal fin (11d)
And the second heat transfer fin (11e) are integrally provided, and the heat transfer fins (11d) (11e) between the adjacent heat transfer fins (11d) and (11e) and the left and right ends and the left and right side wall portions (11a) are provided. The high-temperature combustion exhaust gas flows through the passage portion (13). The pitch between adjacent heat transfer fins (11d) and (11e) of the lower hot gas flow regulating member (11) is smaller than that of the upper hot gas flow regulating member (11), 11d) It is preferable that the number of (11e) is large and the heat transfer area is large. The rear end reaches the rear edge of the left and right side wall portions (11a) between the left and right side wall portions (11a) of the upper and lower hot gas flow restricting members (11), and both high temperature gas flow restricting members (11) Gas leak prevention part (17) for preventing exhaust gas from flowing out to the side
Is provided. Each of the high-temperature gas flow restricting members (11) includes a fixing member (16) that has the tip of the second heat transfer fin (11e) brazed to the heat transfer partition (3) and extends vertically at both left and right side edges. The rear wall (11b) is fixed to the heat transfer partition (3), and the peripheral edge of the front end of the cylindrical portion (2a) is in contact with the rear surface of the rear wall (11b). Therefore, the high-temperature combustion exhaust gas generated in the combustion chamber (8) passes through the communication port (30) formed between the upper and lower high-temperature gas flow regulating members (11) and enters the high-temperature gas passage (4). It is designed to flow in. The fixing member (16) is formed of a brazing sheet made of a core material (16a) and a brazing material (16b) covering both surfaces of the core material (16a). The core material of the brazing sheet (16a)
It is made of an aluminum alloy containing 0.05 to 0.20 wt% of copper and 1.0 to 1.5 wt% of manganese, with the balance being aluminum and unavoidable impurities. Skin material (16b) is silicon 8.0-1
It is made of an aluminum alloy brazing material containing 0.0 wt% and iron of 0.2 to 0.5 wt%, the balance being aluminum and unavoidable impurities. The fixing member (16) has a substantially L-shaped cross section, and protrudes rearward from a first portion (14) that is in close contact with the inner surface of the heat transfer partition (3) and opposing edges of the first portion (14). It is composed of a second part (15). The second part (1
5) The left and right side walls (11a) of the high temperature gas flow regulating member (11)
It is closely attached to the inner surface. The front edges of the left and right side walls (11a) are cut by the thickness of the first portion (14), so that no gap is formed between the second heat transfer fin (11e) and the heat transfer partition (3). It has become. The first part (1
A gas leakage prevention part (17) is provided integrally with the fourth part (15) and the second part (15). A rear protruding portion (15a) is integrally provided at both upper and lower ends of the second portion (15), and the rear protruding portion (15a) contacts an end of the intermediate wall portion (11c). In the first portion (14), a plurality of holes (18) are formed at predetermined intervals in the up-down direction, and these holes (18) are provided integrally with the heat transfer partition (3). Heat transfer partition (3) with the projection (19) fitted
It is brazed to. The projection (19) has a substantially L-shaped cross section,
A U-shaped cut is made in the heat transfer partition (3), the portion surrounded by the cut is bent backward, and the hot gas flow regulating member (1
1) It is formed by bending to the side. The hole (20) formed to form the projection (19) by the edge of the hole (18) on the high-temperature gas flow regulating member (11) side abutting against the rear bent portion (19a) of the projection (19). ) Is blocked.

In the hot gas passage (4), the upper end of the passage (13) of the upper hot gas flow regulating member (11), which is located above the upper hot gas flow regulating member (11), and the exhaust pipe ( And a guide path (31) for communicating with the high-temperature gas flow restricting member (11) on the left and right sides of the high-temperature gas flow restricting members (11). A guide path (32) for communicating the lower end of the passage portion (13) of the high temperature gas flow regulating member (11) with the exhaust pipe (9) is provided.

The upper and lower ends of the refrigerant passage member (5) are bent forward and horizontally, respectively, and their ends are connected to the header (22). The bent portion is indicated by (5a).
The lower header (22) is an inlet header, and a refrigerant inlet pipe (23) is connected to a left end thereof. The oil of the compressor is always dissolved in the refrigerant, and when the refrigerant is heated and vaporized, the oil gradually accumulates, and its viscosity and low heat transfer inhibit the refrigerant from vaporizing and circulating. An oil drain pipe (24) is connected to the right end of the side header (22). The upper header (22) is an outlet header, and a refrigerant outlet pipe (25) is connected to a left end thereof. An elongated hole (26) extending in the axial direction is formed in the peripheral wall of each of the headers (22), and the tip of the bent portion (5a) of the refrigerant passage member (5) passes through the elongated hole (26). It is inserted into the header (22) and brazed to the peripheral wall of the header (22). As shown in FIG. 3, both headers (22) are mutually superimposed on both side edges of a brazing sheet (22) in which both sides of a core material (22a) are covered with a brazing material (22b). The brazing sheet (22) is formed into a cylindrical shape as a header material so that the inclined portions (28) overlap each other, and the header material is brazed. It is formed by doing. The brazing of the inclined portions (28) is performed simultaneously with the brazing of the header (22), the coolant passage member (5) and other members.

In such a configuration, the combustion gas of the burner (B) enters the high-temperature gas passage (4) through the communication port (30) formed between the upper and lower high-temperature gas flow regulating members (11), It flows upward in the passage portion (13) of the high-temperature gas flow regulating member (11), and is further discharged from the exhaust pipe (9) through the guide passage (31). Similarly, it flows downward in the passage portion (13) of the lower high-temperature gas flow regulating member (11), and is further discharged from the exhaust pipe (9) through the guide passage (32). The heat of the exhaust gas is transferred to the heat transfer partition (3) directly or via the heat transfer fins (11d) (11e) while flowing in the high-temperature gas passage (4), and the heat transfer partition (3) and the refrigerant passage The refrigerant is transmitted to the refrigerant flowing through the refrigerant passage (6) of the refrigerant passage member (5) through the peripheral wall of the member (5). The refrigerant is a burner (B)
Is heated and vaporized by the combustion heat of the air, and the latent heat is used to perform heating. At this time, the refrigerant is first heated in the lower part of the refrigerant passage member (5) and partially vaporized,
The inside of the refrigerant passage (6) naturally rises by the action of the vaporized refrigerant, and the whole is vaporized. The pitch between the adjacent heat transfer fins (11d) and (11e) of the lower high-temperature gas flow restricting member (11) is made smaller than that of the upper high-temperature gas flow restricting member (11). Is larger, the amount of heat transfer to the refrigerant in the lower part is increased, and the natural ascent force is increased.

Hereinafter, the method of manufacturing the heat exchanger (1) will be described in the fifth.
This will be described with reference to FIGS.

In advance, a heat transfer partition (3) made of an aluminum brazing sheet, a flat tubular refrigerant passage member (5) having a galvanized layer (7), a high-temperature gas flow regulating member (11), a fixing member (16) made of an aluminum brazing sheet, aluminum The brazing sheet is formed into a cylindrical shape and has a long hole (2
Prepare a header material (29) having 6). A projection (19) is formed on the heat transfer partition (3). A hole (18) is formed in the fixing member (16).

Then, first, the protrusion (19) of the heat transfer partition (3) in the hole (18) of the fixing member (16) is passed through, so that the fixing member (16)
Is temporarily fixed to the heat transfer partition (3). At this time, protrusion (19)
The rear bent portion (19a) of the fixing member (16) comes into contact with the edge of the hole (18) of the fixing member (16) on the high-temperature gas flow regulating member (11) side, and the projection (19)
The hole (20) formed in the heat transfer partition (3) is closed in order to form. Next, the left and right side walls (11a) are fixed members (1
The two high-temperature gas flow regulating members (11) are arranged so as to be in close contact with the outer surface of the second portion (15) of (6). At this time, the rear protruding portions (15a) integrally provided at the upper and lower ends of the second portion (15) hit the end surfaces of the intermediate wall portion (11c), and the gas leakage preventing portion (17) is connected to the rear wall portion ( 11b) and the intermediate wall (11c). Therefore, the high-temperature gas flow regulating member (11) is positioned in the left-right direction and the up-down direction by the fixing member (16). After that, the refrigerant passage member (5) is arranged on the surface opposite to the heat transfer partition (3), and the tip of the bent portion (5a) is inserted into the long hole (26) of the header material (29). Fix with an appropriate jig (not shown). And the heat transfer partition (3) and the fixing member (16), the heat transfer partition (3)
And high-temperature gas flow restricting member (11), fixing member (16) and high-temperature gas flow restricting member (11), heat transfer partition (3) and refrigerant passage member (5), inclined portion (28) of header material (29) Then, the peripheral edges of the coolant passage member (5) and the long hole (26) are brazed. By the heating during this brazing step, the zinc contained in the skin material (3b) of the heat transfer partition (3) becomes a core material (3a).
To form a zinc diffusion layer for corrosion protection. Further, the zinc plating layer (7) formed in the refrigerant passage member (5) is diffused into the aluminum of the refrigerant passage member (5), and a zinc diffusion layer for corrosion protection is formed. Further, the heat exchanger (1) is manufactured by fixing the heat transfer partition (3) to the combustion drum (2).

Effects of the Invention According to the method of the present invention, the heat transfer partition is provided with a refrigerant passage member having both ends bent upward along the upper surface of the heat transfer partition. The high-temperature gas flow restricting member is arranged along the lower surface of the heat transfer member, and then the heat transfer partition, the refrigerant passage member, and the high-temperature gas flow restricting member are fixed with a jig. Since the heat bulkhead and the high-temperature gas flow regulating member are brazed respectively, when fixing these parts for brazing, a brazing jig having a simple structure may be used, and the number thereof is also large. I need less. Therefore, the fixing operation using the jig is simplified. In addition, since the heat transfer partition and the refrigerant passage member are fixed in close contact with each other by the jig, the brazing of both is reliably performed, and a gap is prevented from being formed between the two. The heat transfer coefficient to the refrigerant passage member is improved. Also, even if pitting occurs in the refrigerant passage member and refrigerant such as freon leaks, this can prevent pitting from occurring in the heat transfer partition, so that toxic gas generated by the reaction between freon and combustion gas can be prevented. Occurrence can be prevented.

[Brief description of the drawings]

The drawings show an embodiment of the heat exchanger according to the present invention, FIG. 1 is a partially cutaway perspective view, FIG. 2 is a horizontal enlarged sectional view, FIG. 3 is an enlarged transverse sectional view of a header, and FIG. 5 is a partially enlarged view of FIG. 2, and FIGS. 5 to 7 show a method of manufacturing the heat exchanger shown in FIG. 1. FIG. 5 is a diagram showing a state before a heat transfer partition, a high-temperature gas flow regulating member, and a fixing member are temporarily assembled. Partially enlarged perspective view showing the arrangement state of
FIG. 6 is a diagram showing a state before brazing of a heat transfer partition, a refrigerant passage member, a high-temperature gas flow regulating member, and a header, FIG. 7 is a diagram showing a state after brazing, and FIG. FIG. 9 is a perspective view showing a conventional example. (1) ... heat exchanger, (2) ... combustion cylinder, (3) ... heat transfer partition, (5) ... flat tubular refrigerant passage member, (6) ...
Refrigerant passage, (11) High temperature gas flow regulating member, (22)
Header, (29) ... header material, (B) ... burner.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tadayoshi Ohashi 6,224, Kaiyamacho, Sakai City, Osaka Prefecture Inside Showa Aluminum Co., Ltd. (72) Inventor Minoru Takayama 6,224, Kaiyamacho, Sakai City, Osaka Prefecture Aluminium Showa Inside (72) Inventor Yoshifumi Shimajiri 6,224, Kaiyama-cho, Sakai-shi, Osaka Showa Aluminum Co., Ltd. (56) References JP-A-4-172172 (JP, A) JP-A1-271065 (JP) , A) JP-A-1-271064 (JP, A) JP-A-1-271063 (JP, A) JP-A-63-97066 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB Name) B23K 1/00-3/08 F28F 1/02 F28D 7/00

Claims (1)

(57) [Claims] 1. A cylindrical combustion cylinder having a burner attached at one end, a heat transfer partition made of aluminum for closing an opening of the other end of the combustion cylinder, and a high-temperature gas flow regulating member brazed to an inner surface of the heat transfer partition. Manufactures a heat exchanger including an aluminum flat tubular refrigerant passage member brazed to the outer surface of a heat transfer partition and having a plurality of refrigerant passages therein, and aluminum headers attached to both ends of the refrigerant passage member. A step in which a flat tubular refrigerant passage member whose both ends are bent upward along the upper surface of the heat transfer partition; a step of covering a header at the end of each bent end of the flat tubular refrigerant passage member; Making the high-temperature gas flow restricting member follow the lower surface of the heat partition; fixing the heat transfer partition, the refrigerant passage member, and the high-temperature gas flow restricting member with a jig; , And biography And a step of brazing the hot partition and the high-temperature gas flow regulating member, respectively.