JP3012945B2 - Heat exchanger - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for a cooling and heating device used for cooling, for example, in winter and for heating in winter, and more particularly, for cooling in summer. Is heated by the heat of combustion of an oil burner or gas burner in the winter to evaporate it, and the refrigerant is heated by the combustion heat of the burner in a heating and cooling device that uses the latent heat to heat the refrigerant. The heat exchanger used to perform the heat transfer.

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. 9, 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 provided in the middle of the sealed pipe (42) for forcibly circulating the refrigerant. (43) is used.

Conventionally, such heat exchangers for air conditioners have
As shown in Fig. 10, a through hole (51) extending in the axial direction of the combustion cylinder (50) is formed on the peripheral wall (50a) of the cylindrical combustion cylinder (50) made of an extruded aluminum material having an internal combustion chamber. A plurality of fins (52) extending in the length direction are formed on the inner surface of the peripheral wall (50a) of the combustion cylinder (50) at predetermined intervals in the direction.
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 is cylindrical and the refrigerant passage member is arc-shaped, in order to manufacture such a heat exchanger, many jigs having a complicated structure are required, and 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 heat exchanger that solves all of the above problems.

Means for Solving the Problems A heat exchanger according to the present invention has a tubular combustion cylinder having a burner attached to one end, an aluminum heat transfer partition for closing the other end opening of the combustion cylinder, and a wax on the inner surface of the heat transfer partition. A high-temperature gas flow regulating member attached thereto, an aluminum flat tubular refrigerant passage member brazed to the outer surface of the heat transfer interval and having a plurality of refrigerant passages therein, and aluminum attached to both ends of the refrigerant passage member The heat transfer partition is made of an aluminum brazing sheet made of a brazing material that covers both sides of the core material and the core material. A bulging portion is provided on one of the bulging portions, a high-temperature gas flow regulating member is brazed to one surface of a top wall of the bulging portion, and a refrigerant passage member is brazed to the other surface.

According to the heat exchanger of the present invention, the heat transfer partition is set in a horizontal state, the upper surface of the top wall of the bulging portion is provided with the refrigerant passage member whose both ends are bent upward, and the high temperature gas flow is formed on the lower surface thereof. Along the regulating member, then fix the heat transfer tube wall, the refrigerant passage member, and the high-temperature gas flow regulating member with a jig, and braze the heat transfer tube wall, the refrigerant passage member, and the high-temperature gas flow regulating member, respectively. In order to fix these parts for brazing, a brazing jig having a simple structure may be used, and the number of these parts may be reduced. Therefore, the fixing work with the jig is simplified, and the heat transfer partition and the refrigerant passage member are fixed in close contact with each other by the jig.
The formation of a gap between the two is prevented.

Further, since the heat transfer partition is provided with a swelling portion bulging inward or outward except for a frame-shaped predetermined width portion of the periphery thereof, the heat transfer partition, the refrigerant passage member, and the high-temperature gas are provided as described above. When brazing to the flow regulating member, the heat is softened by the heat and the peripheral portion of the heat transfer partition is prevented from warping downward due to gravity. When such a warp occurs, the brazing material accumulates at the tip, and when a cylindrical combustion cylinder is mounted on the surface to which the high-temperature gas flow regulating member is brazed, the close contact between the heat transfer partition and the combustion cylinder is caused. And the exhaust gas may leak.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the front and rear are based on FIG. 3, the front indicates the upper side of FIG. 3, and the rear indicates the opposite side. Also, except where the manufacturing method is described,
Up, down, left, and right refer to up, down, left, and right in FIG.

1 to 6 show one embodiment of the heat exchanger according to the present invention. 1 to 6, a heat exchanger (1) comprises 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; a heat transfer partition (3) made of an aluminum brazing sheet for closing a front end opening of the combustion cylinder (2); A hot gas passageway (4) formed inside the thermal partition (3); and a plurality of refrigerant passages (6) brazed to the outer surface of the heat transfer partition (3) and extending vertically therein.
And a refrigerant passage member (5) comprising a flat tube made of an extruded aluminum material and having a galvanized layer (7) formed on the surface thereof.

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 (9). A hot gas passage (4) is provided in the expanding portion (2b). An exhaust port (25) for connecting an exhaust pipe is formed at the upper end of the expanded 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%. The heat transfer partition (3) is provided with a bulging portion (11) bulging inward except for a frame-shaped predetermined width portion (10) on the periphery thereof, and the bulging portion (11)
A hot gas passage (4) is provided on the inner surface of the top wall (11a), and a refrigerant passage member (5) is brazed on the outer surface.

The high-temperature gas passage (4) includes two high-temperature gas flow restricting members (12, 13) made of an extruded aluminum material and arranged at predetermined intervals above and below. The upper and lower hot gas flow regulating members (12) and (13) are a rear wall portion connecting left and right side wall portions (12a) and (13a) extending in the vertical direction and rear edges of the left and right side wall portions (12a) and (13a). (12b), (13b), and intermediate wall portions (12c) (13c) connecting the center portions of the widths of the left and right side wall portions (12a) (13a), and the rear wall portions (12b) (13c).
The first heat transfer fins (12d) (13d) and the first heat transfer fins (12d) (13d) are formed between the b) and the intermediate wall portions (12c) (13c), and at right angles to the front surfaces of the intermediate wall portions (12c) (13c), respectively. The second heat transfer fins (12e) and (13e) are provided integrally, and both heat transfer fins (12d) and (12e) are provided between adjacent heat transfer fins (12d) (12e) (13d) and (13e) and at both left and right ends. The high-temperature combustion exhaust gas flows through the passage portions (14) (15) between (13d) (13e) and the left and right side wall portions (12a) (13a). The rear wall portion (12b) of the upper high-temperature gas flow regulating member (12) projects outward in the left-right direction from the left and right side wall portions (12a), and
The tip is bent forward, and the left and right side walls (12a)
Between the front bent wall (12f) and the rear wall (12b)
A third heat transfer fin (12 g) perpendicular to the third heat transfer fin is integrally provided on the front surface of the fin. High-temperature combustion exhaust gas also flows through the passage portion (16) between the left and right side wall portions (12a) and the front bent wall portion (12f) and the third fin (12g). The pitch between adjacent heat transfer fins (13d) and (13e) of the lower hot gas flow regulating member (13) is smaller than that of the upper hot gas flow regulating member (12). 13d) It is preferable that the number of (13e) is large and the heat transfer area is large.

Between the left and right side wall portions (12a) and (13a) of the upper and lower high-temperature gas flow regulating members (12) and (13), the rear ends are formed by the left and right side wall portions (12 and 13a).
a) A gas leakage prevention part (17) is provided which reaches the trailing edge of (13a) and which prevents exhaust gas from flowing out between the high-temperature gas flow regulating members (12) and (13) to the side. ing. The upper and lower high-temperature gas flow restricting members (12) are fixed members that have the ends of the second heat transfer fins (12e) (13e) brazed to the heat transfer partition (3) and extend vertically at both left and right side edges. It is fixed to the heat transfer partition (3) via (18). 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 brazing sheet made of a core material (18a) and a brazing material (18b) covering both surfaces of the core material (18a). Brazing sheet core material (18a)
Contains copper 0.05-0.20wt%, manganese 1.0-1.5wt%,
It is formed of an aluminum alloy containing the remainder aluminum and inevitable impurities. Leather (18b) is silicon 8.0
It is made of an aluminum alloy brazing material containing up to 10.0% by weight and 0.2 to 0.5% by weight of iron, the balance being aluminum and unavoidable impurities. The fixing member (18) has a substantially L-shaped cross section,
It comprises a first portion (19) which is in close contact with the inner surface of the heat transfer partition (3), and a second portion (20) which projects rearward from mutually opposing edges of the first portion (19). The second portion (20) is brought into close contact with a surface of the high-temperature gas flow regulating member (12) (13) facing the center of the width of the left and right side wall portions (12a) (13a). The front edges of the left and right side walls (12a) of the upper high-temperature gas flow regulating member (12) are cut over a predetermined length by the thickness of the first portion (19), and the second heat transfer fins (12e) are formed. No gap is formed between the front bent wall portion (12f) and the third heat transfer fin (12g) and the heat transfer partition (3). 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 the second heat transfer fins (13
There is no gap between e) and the heat transfer partition (3). Further, a gas leakage prevention portion (17) is provided integrally with the second portion (20) of the fixing member (18). At the lower end of the second part (20), a rear protruding part (20a)
The rear protruding portion (20a) abuts on the lower end of the intermediate wall (13c) of the lower high-temperature gas flow regulating member (13). In the first portion (19), a plurality of holes (21) are formed at predetermined intervals in the vertical direction, and these holes (21) are provided integrally with the heat transfer partition (3). The projection (22) is brazed to the heat transfer partition (3) with the projection (22) fitted therein. The projection (22) has a substantially L-shaped cross section, and a U-shaped cut is made in the heat transfer partition (3), and the portion surrounded by the cut is bent backward and the hot gas flow regulating members (12) (13) side It is formed by bending to. The projection (22) was formed by the edge of the hole (21) on the high-temperature gas flow regulating member (12) (13) side contacting the rear bent portion (22a) of the projection (22). Hole (35)
Is blocked.

Then, the peripheral edge of the front end of the cylindrical portion (2a) of the combustion cylinder (2) is moved to the rear wall portion (12) of the upper and lower hot gas flow regulating members (12) and (13).
b) While making contact with the rear surface of (13b), the expanded portion (2b)
A plate-like seal (23) is interposed between the rear wall portion of the upper portion and the rear wall portions (12b) (13b) of the upper and lower hot gas flow regulating members (12) (13), and the periphery of the expanded portion (2b) The high-temperature gas passage (4) is formed by screwing the flange (2c) to the frame-shaped predetermined width portion (10) of the heat transfer partition (3). The high-temperature combustion exhaust gas generated in the combustion chamber (8) passes through the communication port (2) formed between the upper and lower high-temperature gas flow regulating members (12) and (13).
4) and flows into the hot gas passage (4). The hot gas passage (4) is located above the upper hot gas flow restricting member (12), and is connected to the upper end of the passage portion (14) (16) of the upper hot gas flow restricting member (12) and the exhaust port. A guide path (26) communicating with (25) is provided, and a lower high-temperature gas flow restricting member (13) that is present on the lower side and on both left and right sides of the lower high-temperature gas flow restricting member (13). High temperature gas flow restricting member (1
A guide path (27) for communicating with the passage section (16) of (2) 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 (28). The bent portion is indicated by (5a).
The lower header (28) is an inlet header, and a refrigerant inlet pipe (29) is connected to the 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 the viscosity and low heat conductivity impede the vaporization and circulation of the refrigerant. An oil drain pipe (30) is connected to the right end of the side header (28). The upper header (28) is an outlet header, and a refrigerant outlet pipe (31) is connected to the left end thereof. An elongated hole (32) extending in the axial direction is formed in the peripheral wall of each of the headers (28), and the tip of the bent portion (5a) of the refrigerant passage member (5) passes through the elongated hole (32). It is inserted into the header (28) and brazed to the peripheral wall of the header (28). As shown in FIG. 4, both headers (28) have inclined portions which are overlapped with each other on both sides of a brazing sheet in which both surfaces of a core material (28a) are covered with brazing material (28b). (33) is formed, and the brazing sheet is formed into a cylindrical shape so that the inclined portions (33) overlap each other to form a header material (34), and the header material (34)
Are formed by brazing the inclined portions (33). The brazing of the inclined portions (33) is performed simultaneously with the brazing of the header (33), the refrigerant 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 (24) formed between the upper and lower high-temperature gas flow regulating members (12, 13). The air flows upward in the passage portion (14) of the upper high-temperature gas flow regulating members (12, 13), and is further discharged from the exhaust port (25) through the guide path (26). Also, it flows downward in the passage portion (15) of the lower high-temperature gas flow regulating member (13),
Further, the air enters the passage portion (16) of the upper high-temperature gas flow regulating member (12) through the guide path (27), and is discharged from the exhaust pipe (25) through the guide path (26). The heat of the exhaust gas is transferred to the heat transfer partition (3) directly or through the heat transfer fins (12d) (12e) (12g) (13d) (13e) while flowing in the hot gas passage (4). The heat is transmitted to the refrigerant flowing in the refrigerant passage (6) of the refrigerant passage member (5) through the heat transfer partition (3) and the peripheral wall of the refrigerant passage member (5). The refrigerant is heated and vaporized by the combustion heat of the burner (B), and the latent heat is used for heating. At this time, the refrigerant is first heated in the lower portion of the refrigerant passage member (5) and partially vaporized, and naturally rises in the refrigerant passage (6) by the action of the vaporized refrigerant, and the entire gas is vaporized. Then, the adjacent heat transfer fins (13d) (13) of the lower hot gas flow regulating member (13)
If the hitch during e) is made smaller than that of the upper high-temperature gas flow regulating member (12) and the heat transfer area becomes larger, the amount of heat transfer to the refrigerant in the lower portion becomes larger, and the natural rising force Becomes larger.

Hereinafter, the method of manufacturing the heat exchanger (1) will be described in the seventh.
This will be described with reference to FIG. 8 and FIG.

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), high temperature gas flow regulating members (12) (13), and a fixing member (18) made of an aluminum brazing sheet ), A header material (34) prepared by molding an aluminum brazing sheet into a cylindrical shape and having a long hole (32). A projection (22) is formed on the heat transfer partition (3). Also,
A hole (21) is formed in the fixing member (18).

Then, first, the projection (22) of the heat transfer partition (3) is passed through the hole (21) of the fixing member (18), so that the fixing member (18)
Is temporarily fixed to the heat transfer partition (3). At this time, protrusion (22)
The rear bent portion (22a) abuts 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). The hole made in (3) (3
5) is closed. Next, the left and right side walls (12a) (13a)
The two high-temperature gas flow restricting members (12) and (13) are arranged so as to closely contact the outer surface of the second portion (20) of the fixing member (18).
At this time, the rear protruding portion (20a) integrally provided at the lower end of the second portion (20) hits the lower end of the intermediate wall (13c), and the gas leakage preventing portion (17) functions as the rear wall ( 12b)
(13b) and the intermediate wall (12c) (13c). Therefore, the high-temperature gas flow regulating members (12) and (13) are positioned in the left-right direction and the up-down direction by the fixing member (18). Thereafter, 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 (32) of the header material (34). Fix with an appropriate jig (not shown). The heat transfer partition (3) and the fixing member (18), the heat transfer partition (3) and the high temperature gas flow restricting members (12) and (13), and the fixing member (18) and the high temperature gas flow restricting members (12) and (13) ), The heat transfer partition (3) and the coolant passage member (5), the inclined portions (33) of the header material (34), and the coolant passage member (5) and the peripheral edges of the long holes (32) 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, by the function of the bulging portion (11) formed in the heat transfer partition (3), the heat transfer during the brazing softens the heat transfer partition (3) and warps its peripheral portion downward by gravity. Is prevented. Finally, the heat exchanger (1) is manufactured by fixing the heat transfer partition (3) to the combustion cylinder (2).

Effects of the Invention According to the heat exchanger of the present invention, the heat transfer partition is set in a horizontal state, and the refrigerant passage members whose both ends are bent upward along the upper surface of the top wall of the bulging portion are provided. A header is placed on the end of the bent portion at both ends, a high-temperature gas flow restricting member is made to extend along the lower surface of the top wall of the bulging portion, 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 partition and the refrigerant passage member, the refrigerant passage member and the header, and the heat transfer partition and the high-temperature gas flow regulating member are respectively brazed, when fixing these parts for brazing, the structure It is sufficient to use a brazing jig that is simple, and the number thereof can be reduced. Therefore, the fixing operation using the jig is simplified. Moreover, since the heat transfer partition and the refrigerant passage member are fixed in a state of being in close contact with each other by the jig, the brazing of both is also performed reliably, 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, pitting can occur in the combustion drum, thereby reducing the generation of toxic gas due to the reaction between freon and combustion gas. Can be prevented.

Further, since the heat transfer partition is provided with a swelling portion bulging inward or outward except for a frame-shaped predetermined width portion of the periphery thereof, the heat transfer partition, the refrigerant passage member, and the high-temperature gas are provided as described above. When brazing the flow control member, the heat is softened to prevent the peripheral portion of the heat transfer partition from warping downward due to gravity, and the high temperature gas flow control member is cylindrically attached to the brazed surface. When the combustion cylinder is attached, the adhesion between the heat transfer partition and the combustion cylinder may be reduced and leakage may occur.

[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, and FIG. 2 is a partially cutaway II- in FIG.
II is an enlarged sectional view, FIG. 3 is a horizontal enlarged sectional view, FIG. 4 is an enlarged transverse sectional view of the header, FIG. 5 is a partially enlarged view of FIG. 3, FIG. 6 is a heat transfer partition, and high-temperature gas flow regulation. FIG. 7 and FIG. 8 are partially enlarged exploded perspective views showing a member and a fixing member.
FIG. 7 shows a method of manufacturing the heat exchanger shown in FIG. 7, and FIG. 7 shows a state before brazing of a heat transfer partition, a refrigerant passage member, a high-temperature gas flow regulating member and a header, and FIG. FIG. 9 is a schematic view showing a cooling / heating device, and FIG. 10 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, (10) ... frame-shaped predetermined width part, (11) ... bulging part, (11a) ... top wall, (12) (13) ... high-temperature gas flow regulating member, (28) ... Header, (B) ... burner.

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. An aluminum flat tubular refrigerant passage member brazed to the outer surface of the heat transfer interval, and having a plurality of refrigerant passages therein, and an aluminum header attached to both ends of the refrigerant passage member, and the heat transfer partition is A bulging portion formed of an aluminum brazing sheet made of a brazing material covering both surfaces of the core material and the core material, and bulging to one of the inside and outside of the heat transfer partition except for a frame-shaped predetermined width portion of the periphery thereof. A heat exchanger in which a high-temperature gas flow regulating member is brazed to one surface of a top wall of the bulging portion, and a refrigerant passage member is brazed to the other surface.