JP2821641B2 - 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, front and rear, left and right refer to 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. 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 provided in the middle of the sealed pipe (42) for forcibly circulating the refrigerant. (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 inside, 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, in order to manufacture such a heat exchanger, many jigs having a complicated structure are required, and the jig is used. 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. When such a gap exists, if pitting occurs on the wall of the refrigerant passage member on the combustion cylinder side, refrigerant such as freon leaks into the gap and causes pitting on the combustion cylinder. As a result, the freon enters the combustion cylinder, and the freon and the combustion gas react to generate toxic gas. Further, the presence of the gap deteriorates the efficiency of heat transfer from the combustion drum to the refrigerant passage member.

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 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 exchanger formed inside the heat transfer partition. The high-temperature gas passage, and the aluminum flat tubular refrigerant passage member brazed to the outer surface of the heat transfer bulkhead and having a plurality of internal refrigerant passages, the high-temperature gas passage through an aluminum brazing sheet fixing member. A high-temperature gas flow restricting member made of upper and lower aluminum extrusions, which is brazed to the inner surface of the heat transfer partition and has left and right side walls and a rear wall that integrally connects the rear edges of the left and right side walls. And
The fixing member is a portion that is in close contact with the inner surface of the heat transfer partition, a portion that is continuous with the portion that is in close contact with the inner surface of the heat transfer partition, and that is in close contact with the inner surfaces of the left and right side walls of the high-temperature gas flow regulating member, Gas leakage prevention that connects to the inner surface of the left and right side walls and that the rear edge coincides with the rear edge of the left and right side walls, and that prevents exhaust gas from flowing laterally between the upper and lower hot gas flow regulating members The protrusion provided on one of the inner surface of the heat transfer partition and the portion of the fixing member closely contacting the inner surface of the heat transfer partition is fitted into the hole formed on the other side of the fixing member. Is brazed to the heat transfer partition.

According to the heat exchanger of the present invention, the flat tubular refrigerant passage member is brazed to the outer surface of the heat transfer partition closing the other end opening of the combustion cylinder, and the high-temperature gas flow regulating member is brazed to the inner surface. Therefore, in order to fix them when brazing, a jig having a simple structure may be used, and the number of jigs may be reduced. In addition, the protrusion provided on any one of the heat transfer partition inner surface and the close contact portion to the heat transfer partition inner surface of the fixing member is fitted into a hole formed on the other,
If the fixing member is brazed to the heat transfer partition in a state where the portions of the fixing member that are in close contact with the inner surfaces of the left and right side walls of the high-temperature gas flow restricting member are in close contact with the inner surfaces of the left and right side walls of the high-temperature gas flow restricting member. The positioning of the high temperature gas flow regulating member at the time can be easily performed.

Further, according to the heat exchanger of the present invention, the combustion exhaust gas of the burner enters the upper hot gas flow regulating member from between the upper and lower hot gas flow regulating members and flows upward through the inside.
In addition, from between the upper and lower high-temperature gas flow restricting members, it enters the lower high-temperature gas flow restricting member and flows downward therethrough. The heat of the high-temperature combustion exhaust gas is transmitted to the refrigerant flowing in the refrigerant passage of the refrigerant passage member through the heat transfer partition and the peripheral wall of the refrigerant passage member, and the refrigerant is heated and vaporized by the combustion heat of the burner. At this time, the gas leakage preventing member of the fixing member prevents the gas from flowing out to the left and right sides from between the upper and lower high-temperature gas flow regulating members.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4, a heat exchanger (1) has a horizontal tubular combustion cylinder (2) open at both ends and a heat exchanger (1) attached to the rear end of the combustion cylinder (2) for converting oil, gas or the like into fuel. A burner (B), an aluminum heat transfer partition (3) for closing a front end opening of the combustion cylinder (2), a hot gas passage (4) formed inside the heat transfer partition (3), A flat tube made of an extruded aluminum material having a plurality of refrigerant passages (6) brazed to the outer surface of the thermal bulkhead (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) A gas leakage prevention portion (17) is provided for preventing the exhaust gas from flowing out to the side. 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 end portion (11b) is fixed to the heat transfer bulkhead (3), and the peripheral surface of the front end portion of the cylindrical portion (2a) is in contact with the rear surface of the rear end portion (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 a gap is formed between the second heat transfer fin (11e) and the heat transfer partition (3). Not to be. 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 the 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 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 through the guide path (32) from the exhaust space (9). The heat of the exhaust gas is transferred to the heat transfer partition (3) directly or via the heat transfer fans (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 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). When the area is large, the amount of heat transfer to the refrigerant in the lower part is large, and the natural rising force is large.

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

A heat transfer partition (3) made of an aluminum brazing sheet, a 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, an aluminum brazing sheet in advance Is prepared into a cylindrical shape, and a header material (29) having a long hole (26) is prepared. 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) is passed through the hole (18) of the fixing member (16), 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) correspond to the ends of the intermediate wall portion (11c), and the gas leakage preventing portion (17) functions as 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).

According to the heat exchanger of the present invention, at the time of its manufacture, in order to fix the heat transfer partition, the flat tubular refrigerant passage member and the high-temperature gas flow regulating member, a brazing jig having a simple structure is used. Well, the number is small and the work is easy. In addition, since the above member is fixed in a close contact state by a jig,
This prevents a gap from being formed between the brazed heat transfer partition and the refrigerant passage member, thereby causing pitting corrosion in the refrigerant passage member and allowing refrigerant such as freon to leak, thereby preventing heat transfer. Since the occurrence of pitting corrosion on the partition walls can be prevented, the generation of toxic gas due to the reaction between freon and the combustion gas can be prevented. Furthermore, the gas leakage prevention portion of the fixing member prevents gas from flowing out between the upper and lower high-temperature gas flow regulating members in both left and right directions, and has a gap between the heat transfer partition and the refrigerant passage member. However, since the heat transfer coefficient between the two is excellent, the heat exchange efficiency between the high-temperature gas flowing in the high-temperature gas passage and the refrigerant is excellent.

[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 provisional assembly of a heat transfer partition, a high temperature gas flow regulating member, and a fixing member. 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, (4) ... high-temperature gas passage, (5) ... flat tubular refrigerant passage member, (6) ... ... refrigerant passage, (11) ... high-temperature gas flow regulating member, (11a) ... left and right side walls, (11b) ... rear wall, (14) ... close contact with the inner surface of the heat transfer partition, (15) …
… Close contact between the high temperature gas flow regulating member and the inner surfaces of the left and right side walls
(16) ... fixing member, (17) ... gas leakage prevention part,
(18) ... hole, (19) ... protrusion, (B) ... burner.

Continuing from the front page (72) Inventor, Tadayoshi Ohashi, 6,224, Kaiyamacho, Sakai-shi, Osaka, Japan Showa Aluminium Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) F28D 1/00-13/00 F25B 41/00

Claims (1)

(57) [Claims] 1. A cylindrical combustion cylinder having a burner mounted at one end, an aluminum heat transfer partition closing an opening at the other end of the combustion cylinder, a high-temperature gas passage formed inside the heat transfer partition, An aluminum flat tubular refrigerant passage member brazed to the outer surface of the partition wall and having a plurality of refrigerant passages therein, and the high-temperature gas passage is brazed to the inner surface of the heat transfer partition via an aluminum brazing sheet fixing member. And two upper and lower high-temperature gas flow regulating members made of an extruded aluminum material having left and right side walls and a rear wall portion integrally connecting the rear edges of the left and right side walls. A portion that is in close contact with the inner surface of the partition wall, a portion that is continuous with the portion that is in close contact with the inner surface of the heat transfer partition and that is in close contact with the inner surfaces of the right and left side walls of the high-temperature gas flow regulating member, Close And a rear edge that matches the rear edge of the left and right side walls and a gas leakage prevention part that prevents exhaust gas from flowing out between the upper and lower high-temperature gas flow regulating members to the side. The fixing member is brazed to the heat transfer partition in a state in which a projection provided on one of the inner surface of the partition and the portion of the fixing member closely contacting the inner surface of the heat transfer partition is fitted into a hole formed on the other. Heat exchanger.