JPH0437467A - Production of heat exchanger - Google Patents

Abstract

PURPOSE:To simplify the construction of the heat exchanger for an air conditioning device by brazing a refrigerant passage member which is put on with a header at the front end to the upper surface along a heat transfer partition wall and a high-temp. gas flow regulating member fixed by means of jigs to the heat transfer partition wall to the under surface. CONSTITUTION:The flat tubular refrigerant passage member 5 which is bent upward at both end and is put on with the header 22 at the front end is disposed to the upper surface along the heat transfer partition wall 3 in the construction of the heat exchanger and the high-temp. gas flow regulating member 11 is disposed to the under surface. The heat exchanger is constituted by fixing. the heat transfer partition wall 3, the refrigerant passage member 5 and the high-temp. gas flow regulating member 11 by means of the jigs and by respectively brazing the heat transfer partition wall 3 to the refrigerant passage member 5, the refrigerant passage member 5 to the header 22, and the heat transfer partition wall 3 to the high-temp. gas flow regulating member 11 at this time. The operation to fix the members by jigs is facilitated and the construction of the brazing jigs is simplified. The heat transfer rate from a burner 2 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a heat exchanger used in an air-conditioning device that is used for air conditioning in the summer and heating in the winter. Freon, etc., which is used as a refrigerant for air conditioning in the summer, is heated and evaporated by the combustion heat of an oil or gas burner in the winter, and the latent heat is used to heat the room. The present invention relates to a method of manufacturing a heat exchanger used for heating with heat.

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

BACKGROUND TECHNOLOGY As shown in Fig. 8, such an air-conditioning 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 air-conditioning equipment, the 9th
As shown in the figure, a through hole (51) extending in the axial direction of the combustion barrel (50) is formed in the circumferential direction in the peripheral wall (50a) of a cylindrical combustion barrel (50) made of an extruded aluminum material whose interior is a combustion chamber. A plurality of combustion cylinders (50) are formed at predetermined intervals.
A plurality of longitudinally extending fins (52) are integrally formed on the inner surface of the peripheral wall (50a) at predetermined intervals in the circumferential direction, and the straight pipe portions of the plurality of hairpin-shaped refrigerant flow pipes (53) are adjacent to each other. The hairpin-shaped refrigerant flow pipes (53) are connected to each other by a U-shaped connecting pipe (54), and a burner (55> is attached to one end opening of the combustion barrel (50). was used.

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 bending part of the refrigerant flow pipe (53) and the connecting pipe (54). However, there was a problem in that 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 large number of jigs. There is a problem in that the work of fixing the combustion shell and the refrigerant passage member becomes troublesome. Additionally, the combustion shell and refrigerant passage member cannot be brought into perfect contact with each other when fixed using a jig, and as a result, the manufactured heat exchanger has a gap between the outer peripheral surface of the combustion shell and the refrigerant passage member. There is no way around it. When such a gap exists, heat transfer efficiency decreases. Further, if the gap exists, the combustion shell refrigerant in the refrigerant passage member leaks and enters the gap, which causes pitting corrosion in 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 method for manufacturing a heat exchanger that solves all of the above problems.

Means for Solving the Problems The method of manufacturing a heat exchanger according to the present invention includes a cylindrical combustion cylinder to which a burner is attached to 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 closes an opening at the other end of the combustion cylinder. 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 inside, and a refrigerant passage member attached to both ends of the refrigerant passage member. A method of manufacturing a heat exchanger comprising an aluminum header comprising the steps of: aligning a flat tubular refrigerant passage member with upwardly bent ends on the upper surface of a heat transfer partition; A process of covering the tips of the bent portions at both ends with a header material, a process of placing a high-temperature gas flow regulating member along the lower surface of the heat transfer partition, and a process of fixing the heat transfer partition, the refrigerant passage member, and the high-temperature gas flow control member with a jig. , the steps of brazing the heat transfer 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, respectively.

Function: According to the method of the present invention, it is sufficient to use a brazing tool having a simple structure, and the number thereof can be reduced.

Further, the heat transfer partition wall and the flat tubular refrigerant passage member are fixed in close contact with each other by the jig, and brazing between the two is also performed reliably.

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

In the following explanation, front, rear, left and right are based on Figure 2.
The front refers to the upper side of Figure 2, and the rear refers to the opposite side. Furthermore, left refers to the left side in Figure 2, and right refers to the opposite side.

1 to 4 show a heat exchanger manufactured by the method of the present invention. In FIGS. 1 to 4, the heat exchanger (1) includes a horizontal cylindrical combustion barrel (2) with open ends,
A burner (B) that is attached to the rear end of the combustion shell (2) and uses oil, gas, etc. as fuel, an aluminum heat transfer partition (3) that closes the front end opening of the combustion shell (2), and a heat transfer partition. (3
) and a plurality of refrigerant passages (6) which are brazed to the outer surface of the heat transfer partition wall (3) and extend vertically inside, and are coated with zinc on the surface. It consists of a refrigerant passage member (5) made of a flat tube made of extruded aluminum material on which a plating layer (7) is formed.

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 (21). A hot gas passage (4) is provided within the widened portion (2b).

The heat transfer partition wall (3) is formed of a plating sheet made of a core material (3a) and a brazing material (3b) covering both sides of the core material (3a), as shown in FIG. The core material (3a) of the praising sheet is zinc 0°9~1.4vt
%, manganese 1.0~1.5vt%, 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 wt% silicon and 0.4 iron.
It is formed of an aluminum alloy brazing material containing ~0.5 vt%, zinc 0.5~3 wt%, and the balance consisting of aluminum and unavoidable impurities. The zinc content in the skin material (3b) is preferably in the range of 0.9 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) is equipped with two high temperature gas flow regulating members (11) made of extruded aluminum and arranged vertically at a predetermined interval. Each high temperature gas flow regulating member (11)
The left and right side walls (lla) extend in the vertical direction, and the rear wall (Ll) connects the rear edges of the left and right side walls (lla).
b), and an intermediate wall (llc) connecting the width centers of the left and right side walls (11a), and between the rear wall (llb) and the intermediate wall (11c), and between the rear wall (llb) and the intermediate wall (11c). A first heat transfer fin (Ltd) and a second heat transfer fin (Ltd) are placed on the front surface of the unit (Ltd) and at right angles thereto, respectively.
ie) are provided integrally, and both adjacent heat transfer fins (l
id) (lie) and both heat transfer fins (
The high-temperature combustion exhaust gas flows through the passage portion 13) between the lid) (Lie) and the left and right side walls (lla). The pitch between adjacent heat transfer fins (lid) (lie) of the lower high temperature gas flow regulating member (11) is made smaller than that of the upper high temperature gas flow regulating member (11), so that the heat transfer fins ( It is preferable that the number of lids (lids) (lie)s is increased so that the heat transfer area becomes large. Between the left and right side walls (Lla) of the upper and lower high temperature gas flow regulating members (11), the rear end is located between the left and right side walls (Lla).
A gas leak prevention portion (17) is provided that reaches the rear edge of the exhaust gas flow regulating member (11) and prevents exhaust gas from flowing out to the side between the two high temperature gas flow regulating members (11). Each high temperature gas flow regulating member (11) has its second heat transfer fin (li
The tip of e) is brazed to the heat transfer partition wall (3), and
It is fixed to the heat transfer partition wall (3) via fixing members (1B) extending vertically at the left and right side edges, and the rear wall part (ll
The peripheral edge of the front end of the cylindrical portion (2a) is in contact with the rear surface of b). 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 into the high-temperature gas passage (4).
It is designed to flow inside. The fixed member (16) is
It is formed of a plating sheet made of a core material (lea) and a brazing sawn material (l[ib) that covers both sides of the core material (lea). The core material (16a) of the plating sheet contains 0.05 to 0.20 wt% copper and 1.0 to 1.0 wt% manganese.
It is made of an aluminum alloy containing 5vt% and the remainder consisting of aluminum and unavoidable impurities. Leather material (1
6b) is silicon 8.0-10. Ovt%, iron 0.2~
It is formed of an aluminum alloy brazing material containing 0.5vt% and the remainder consisting of aluminum and unavoidable impurities. The fixing member (16) has a cross-circuit shape and is connected to the heat transfer partition wall (3).
), and a second portion (14) that protrudes rearward from opposite edges of the first portion (14).
It is composed of a portion (15). Second part (15)
are the left and right side walls (lla) of the high temperature gas flow regulating member (11).
) is closely tied to the inner world. Left and right side walls (lla
) is cut by the thickness of the first portion (14) so that no gap is created between the second heat transfer fin (lie) and the heat transfer partition (3). . Further, a gas leak prevention portion (17) is provided integrally with the first portion (14) and the second portion (15). Rear protrusions (15a) are integrally provided at both upper and lower ends of the second portion (15), and the rear protrusions (15a) abut against the ends of the intermediate wall (llc). Further, a plurality of holes (18) are formed in the second portion (15) at predetermined intervals in the vertical direction, and these holes (18) are provided with holes integrally formed in the heat transfer partition wall (3). The heat transfer partition wall (3) is brazed to the heat transfer partition wall (3) with the protrusion (19) fitted therein. The protrusion (■9) has a cross-circuit shape, and a U-shaped notch is made in the heat transfer partition wall (3), and the part surrounded by this notch is bent backward and toward the hot gas flow regulating member (11). It was formed by The rear bent part of the protrusion (19) (
19a), the high temperature gas flow regulating member (11) of the hole (18)
The abutment of the side edges closes the hole (20) created to form the protrusion (19).

In addition, the high temperature gas passage (4) is located above the upper high temperature gas flow regulating member (11) and is connected to the upper end of the passage portion (13) of the upper high temperature gas flow regulating member (11) and the exhaust pipe ( 9
) are provided below the lower high-temperature gas flow regulating member (11) and on both left and right sides of both high-temperature gas flow regulating members (11); A guide path (32) is provided that communicates the lower end of the passage portion (13) of the high temperature gas flow regulating member (11) with the exhaust pipe (9).

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).
2) is connected to. The bent portion is indicated by (5a).

The lower header (22) is an inlet header, and a refrigerant inlet pipe (23) 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 impede the vaporization and circulation of the refrigerant. 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 its left end. Both headers (
22) are provided with elongated holes (22) extending in the axial direction, respectively.
6) is formed, and the bent part (
5a) passes through this elongated hole (26) and connects to the header (22).
) and is brazed to the peripheral wall of the header (22). As shown in FIG. 3, both headers (22) are placed one on top of the other on both sides of the plating sheet (22), which has a core material (22a) covered with brazing material (22b) on both sides. A sloped portion (28) is formed, and a sloped portion (28) is formed.
2B) Lay out the praising sheets (
22) is formed into a cylindrical shape to serve as a header material, and the inclined portions (28) of the header material are brazed together. Brazing of the inclined parts (28) is performed simultaneously with brazing of the header (22), 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 (30) formed between the upper and lower high-temperature gas flow regulating members (11), and enters the passage section 13) of the upper high-temperature gas flow regulating member (11). flows upward and further passes through the guide path (31) to the exhaust pipe (9).
) is discharged from. The gas also flows downward in the passage portion (13) of the high-temperature gas flow regulating member (11) on the lower side, further passes through the guide path (32), and is discharged from the exhaust pipe (9). The heat possessed by the exhaust gas is transferred to the heat transfer partition (3) directly or via heat transfer fins (Ltd) (lie) while flowing in the high temperature gas passage (4), and is transferred to the heat transfer partition (3) and the coolant passage. It is transmitted through the peripheral wall of the member (5) to the refrigerant flowing in the refrigerant passage (6) of the refrigerant passage member (5). 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. Then, adjacent heat transfer fins (lld) of the lower high temperature gas flow regulating member (11)
) (lie) is made smaller than that of the upper high-temperature gas flow regulating member (11) and the heat transfer area becomes larger, the amount of heat transferred to the refrigerant in the lower part becomes larger and the above-mentioned natural The upward force increases.

Hereinafter, a method for manufacturing the heat exchanger (1) will be explained with reference to FIGS. 5 to 7.

Heat transfer bulkhead made of aluminum plating sheet (3
), a flat tubular refrigerant passage member (5) having a galvanized layer (7), a high-temperature gas flow regulating member (11), a fixing member made of aluminum plating sheet (IB), and an aluminum plating sheet formed into a cylindrical shape. Narikatsu long hole (2
6) is prepared in advance. A protrusion (19) is formed on the heat transfer partition wall (3). Also,
A hole (18) is formed in the fixing member (16).

First, by passing the protrusion (19) of the heat transfer partition (3) through the hole (18) of the fixing member (16), the fixing member (1
B) is temporarily fixed to the heat transfer partition wall (3). At this time, the protrusion (
The heat transfer partition wall ( 3) Close the hole (20) made in step 3). Next, the left and right side walls (l
Both hot gas flow regulating members (11) are arranged so that the second portion (15) of the fixing member (16) is in close contact with the outer surface of the second portion (15) of the fixing member (16). At this time, the rear protrusion (15a) integrally provided at both the upper and lower ends of the second portion (15) is connected to the intermediate wall (li).
e) and the gas leak prevention part (17
) corresponds to the rear wall (llb) and the intermediate wall (llc). Therefore, the fixing member (16) positions the high temperature gas flow regulating member (11) in the horizontal and vertical directions. After that, the refrigerant passage member (5) is placed on the opposite side of the heat transfer partition wall (3), and the header material (2
9) Insert the tip of the bent part (5a) into the long hole (2B),
These are fixed using a suitable jig (not shown). The heat transfer partition wall (3) and the fixing member (16), the heat transfer partition wall (3) and the high temperature gas flow regulating member (11), the fixing member (16) and the high temperature gas flow regulating member (11), the heat transfer partition wall ( 3), the refrigerant passage member (5), and the inclined portion (28) of the header material (29),
Then, the peripheral edges of the refrigerant passage member (5) and the elongated hole (2B) are brazed, respectively. Due to the heating during this brazing process,
Zinc contained in the skin material (3b) of the heat transfer partition wall (3) is diffused into the aluminum of the core material (3a) to form a zinc diffusion layer for corrosion protection.

Furthermore, the galvanized layer (7) formed on the refrigerant passage member (5) is diffused into the aluminum of the refrigerant passage member (5), forming a zinc diffusion layer for corrosion prevention. Furthermore, 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 method of the present invention, a refrigerant passage member whose both ends are bent upward is placed along the upper surface of the heat transfer partition, and a header is placed over the tips of the bent portions at both ends of the refrigerant passage member. The high temperature gas flow regulating member is placed along the lower surface, and then the heat transfer partition, the refrigerant passage member and the high temperature gas flow regulation member are fixed with a jig, and the heat transfer partition and the refrigerant passage member, the refrigerant passage member and the header, and the heat transfer partition are fixed. Since the thermal partition wall and the high-temperature gas flow regulating member are brazed separately, when fixing these parts for brazing, it is sufficient to use brazing fittings with a simple structure, and the number of them can be reduced. Less is needed. 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,
Brazing between the two is also performed reliably, preventing a gap from forming between the two, and improving the heat transfer coefficient from the combustion shell to the refrigerant passage member. 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.

[Brief explanation of the drawing]

The drawings show an embodiment of the heat exchanger according to the present invention, in which FIG. 1 is a partially cutaway perspective view, FIG. 2 is an enlarged horizontal sectional view, FIG. 3 is an enlarged cross-sectional view of the header, and FIG. The partially enlarged view of Fig. 2 and Figs. 5 to 7 show the method for manufacturing the heat exchanger shown in Fig. 1, and Fig. 5 shows the heat exchanger before temporary assembly of the heat transfer partition, the high-temperature gas flow regulating member, and the fixing member. Fig. 6 is a partially enlarged perspective view showing the arrangement of the heat transfer partition wall, refrigerant passage member, high temperature gas flow regulating member, and header before brazing, and Fig. 7 shows the state after brazing. FIG. 8 is a schematic diagram showing a heating and cooling device, and FIG. 9 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, (11)...High temperature gas flow regulating member, (22)...Header, (29)...Header material, (B)...Burner. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A cylindrical combustion cylinder to which a burner is attached at one end, an aluminum heat transfer partition that closes an opening at the other end of the combustion cylinder, and a high-temperature gas flow regulating member brazed to the inner surface of the heat transfer partition. and a heat exchanger consisting of an aluminum flat tubular refrigerant passage member that is brazed to the outer surface of the heat transfer partition wall and has a plurality of refrigerant passages inside, and an aluminum header that is attached to both ends of the refrigerant passage member. A manufacturing method comprising: placing a flat tubular refrigerant passage member having upwardly bent ends on the upper surface of a heat transfer partition; and covering the tips of bent portions at both ends of the flat tubular refrigerant passage member with a header material. , a step of placing a high temperature gas flow regulating member along the lower surface of the heat transfer partition, fixing the heat transfer partition, the refrigerant passage member, and the high temperature gas flow regulation member with a jig, and fixing the heat transfer partition, the refrigerant passage member, and the refrigerant passage member. A method for manufacturing a heat exchanger, comprising the steps of brazing a header, a heat transfer partition wall, and a high-temperature gas flow regulating member, respectively.