JP2821643B2 - 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. And the heat transfer efficiency from the combustion drum to the refrigerant passage member is deteriorated due to the existence of the gap.

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. A high-temperature gas passage, and 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. A high-temperature gas flow made of an aluminum extruded material, having a rear wall portion integrally connecting rear edges of the portions, and having a long opening in the left-right direction at an upper and lower middle portion of the rear wall portion. The regulating member is arranged and fixed to the heat transfer partition, and the high-temperature gas flow regulating member allows the high-temperature gas to flow along the inner surface of the heat transfer partition.

According to the heat exchanger of the present invention, since the flat tubular refrigerant passage member is brazed to the outer surface of the heat transfer partition that closes the other end opening of the combustion cylinder, the brazing of both is reliably performed, and a gap is provided between the two. Is prevented from occurring. Further, the hot gas passage includes a left and right side wall portion and a rear wall portion that integrally connects the rear edge portions of the left and right side wall portions. Is formed and fixed to the heat transfer partition, so that the high-temperature gas flows along the inner surface of the heat transfer partition. Thus, heat exchange between the high-temperature gas and the refrigerant via the heat transfer partition and the peripheral wall of the refrigerant passage member is efficiently performed.

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

In FIGS. 1 to 5, a heat exchanger (1) has a horizontal tubular combustion cylinder (2) open at both ends, and is attached to the rear end of the combustion cylinder (2) and converts oil, gas and 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 a 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).

In the hot gas passage (4), one high-temperature gas flow regulating member (11) made of an extruded aluminum material is arranged. The high-temperature gas flow restricting member (11) includes a left and right side wall (11a) extending vertically, a rear wall (11b) connecting the rear edges of the left and right side walls (11a), and a left and right side wall (11a). It has an intermediate wall (11c) that connects the central portions of the width, and is perpendicular to these between the rear wall (11b) and the intermediate wall (11c) and on the front of the intermediate wall (11c). To make
The first heat transfer fin (11d) and the second heat transfer fin (11e) are provided integrally, and the two adjacent heat transfer fins (11d) (11e) are provided.
High-temperature combustion exhaust gas flows through a passage portion (13) between the heat transfer fins (11d) (11e) and the left and right side wall portions (11a). An opening (10) which is long in the left-right direction is formed in an upper and lower middle portion of the rear wall portion (11b), and openings in the middle wall portion (11c) and the first and second fin portions (11d) (11e). The part corresponding to (10) is cut off. The high-temperature gas flow restricting member (11) has a tip end of the second heat transfer fin (11e) brazed to the heat transfer partition (3), and a fixing member (16) extending vertically at both left and right side edges. The rear end (11b) is in contact with the rear surface of the rear end (11b), and the peripheral edge of the front end of the cylindrical portion (2a) is in contact with the rear surface. Therefore, the high-temperature combustion exhaust gas generated in the combustion chamber (8) flows into the high-temperature gas passage (4) through the opening (10) formed between the upper and lower high-temperature gas flow regulating members (11). It is supposed to. Fixing member (1
6) 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). Brazing sheet core material (16a) is copper
It is made of an aluminum alloy containing 0.05 to 0.20 wt% and manganese 1.0 to 1.5 wt%, the balance being aluminum and unavoidable impurities. The skin material (16b) is silicon 8.0 to 10.0
It is made of an aluminum alloy brazing material containing 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 includes a first portion (14) which is in close contact with the inner surface of the heat transfer partition (3);
It comprises a second portion (15) projecting rearward from opposite edges of the portion (14). Second part (15)
Are closely contacted with the inner surfaces of the left and right side walls (11a) of the high temperature gas flow regulating member (11). The front edges of the left and right side walls (11a) are cut by the thickness of the first portion (14),
No space is formed between the second heat transfer fin (11e) and the heat transfer partition (3). A rear protruding portion (15a) is integrally provided at upper and lower ends of the second portion (15), and the rear protruding portion (15a) contacts an end of the intermediate wall portion (11c). A plurality of holes (18) are formed in the first portion (14) at predetermined intervals in the up-down direction,
These holes (18) are brazed to the heat transfer partition (3) in a state where the projections (19) provided integrally with the heat transfer partition (3) are fitted. The projection (19) 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 bent toward the high-temperature gas flow regulating member (11). It is formed by: Protrusion (19)
When the edge of the hole (18) on the high-temperature gas flow regulating member (11) side abuts on the rear bent portion (19a) of the hole, the hole (20) formed to form the projection (19) is closed. Have been.

The high-temperature gas passage (4) is located above the high-temperature gas flow restricting member (11) and has a high-temperature gas flow restricting member (11).
A guide path (31) for communicating the upper end of the passage portion (13) with the exhaust pipe (9) is provided, and the lower side of the high-temperature gas flow restricting member (11) and the two high-temperature gas flow restricting members (11) Guide paths (32) are provided on both the left and right sides and communicate the lower end of the passage portion (13) of the high temperature gas flow regulating member (11) with the exhaust pipe (9).

Both upper and lower ends of the refrigerant passage member (5) are bent forward and horizontally so as to have a leading end 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. Oil drain pipe (24) at the right end of the side header (22)
Is connected. The upper header (22) is an outlet header, and a refrigerant outlet pipe (25) is connected to a left end thereof. Slots (26) extending in the axial direction are formed in the peripheral walls of both headers (22), respectively.
The tip of the bent portion (5a) is inserted into the header (22) through the elongated hole (26) 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, and the inclined portions (28) of the header material are brazed together. 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) passes through the opening (10) formed in the rear wall (11b) of the high-temperature gas flow restricting member (11) and passes through the passage of the high-temperature gas flow restricting member (11). It enters the member (13), flows upward through the portion of the passage portion (13) above the opening (10), and is further discharged from the exhaust pipe (9) through the guide passage (31). Also, it flows downward through the portion of the passage portion (13) below the opening (10),
Further, the air is discharged from the exhaust pipe (9) through the guide path (32). The heat of the exhaust gas is used to control the hot gas flow (11)
During the flow in the passage portion (13) and the guide paths (31) and (32), the heat is transmitted directly or through the heat transfer fins (11d) and (11e) to the heat transfer partition (3), and the heat transfer partition (3) And, it is transmitted to the refrigerant flowing through the refrigerant passage (6) of the refrigerant passage member (5) through 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.

 The heat exchanger (1) is manufactured as follows.

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 formed into a cylindrical shape, and a header material having a long hole (26) is prepared. A projection (19) is formed on the heat transfer partition (3). In addition, the fixing member (16)
The hole (18) is formed beforehand.

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 high-temperature gas flow regulating member (11) is 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 (11c). Therefore, the high temperature gas flow regulating member (11) is fixed by the fixing member (16).
In the horizontal direction and the vertical direction. Then, the refrigerant passage member (5) is provided on the surface opposite to the heat transfer partition (3).
And insert the tip of the bent portion (5a) into the long hole (26) of the header material, and fix them with a suitable jig (not shown). And the heat transfer partition (3) and the fixing member (16)
The first portion (14), the heat transfer partition (3) and the second heat transfer fin (11e) of the high temperature gas flow restricting member (11), the second portion (15) of the fixing member (16) and the high temperature gas flow restriction Inner surfaces of left and right side walls (11a) of member (11), heat transfer partition (3) and refrigerant passage member (5), inclined portions (28) of header material, refrigerant passage member (5) and slot (26) Are brazed to the periphery. By the heating during the brazing step, zinc contained in the skin (3b) of the heat transfer partition (3) is diffused into the aluminum of the core (3a), and a zinc diffusion layer for corrosion protection is formed. It is formed. 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).

6 and 7 show another embodiment of the present invention. 6 and 7, a wing portion (12) extending in the left-right direction is provided integrally with the left and right side edges of the rear wall portion (11b) of the high-temperature gas flow regulating member (11).
Other configurations are the same as those of the above embodiment.

Effect of the Invention According to the heat exchanger of the present invention, since the flat tubular refrigerant passage member is brazed to the outer surface of the heat transfer partition closing one end opening of the combustion cylinder, the jig having a simple structure is brought into close contact with the jig. It can be fixed, the work is easy, and the brazing of both is performed reliably. Therefore, it is possible to prevent a gap from being formed between the heat transfer partition and the refrigerant passage member. Further, in the high-temperature gas passage, a left and right side wall portion and a rear wall portion that integrally connects the rear edge portions of the left and right side wall portions are provided,
In addition, a single high-temperature gas flow restricting member made of an extruded aluminum material and having a long opening in the left-right direction is disposed at the upper and lower middle portions of the rear wall portion and fixed to the heat transfer partition. The member allows the high-temperature gas to flow along the inner surface of the heat transfer partition, and, together with the fact that there is no gap between the heat transfer partition and the refrigerant passage member, through the heat transfer partition and the refrigerant passage member peripheral wall. Heat exchange between the high-temperature gas and the refrigerant is efficiently performed.

[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. FIG. 2 is a partially enlarged view of FIG. 2, FIG. 5 is an exploded perspective view of a heat transfer partition, a high-temperature gas flow regulating member, and a fixing member, FIG. 6 is a diagram corresponding to FIG. 1 showing another embodiment of the present invention, 7 is a diagram corresponding to FIG. 5, FIG. 8 is a schematic diagram showing a cooling / heating device, and 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) refrigerant passage member, (6) refrigerant Passage, (10) ... Opening, (11) ...
... High-temperature gas flow restricting member, (11a) ...
b) ... rear wall, (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 right and left side wall portions and the rear edge portions of the left and right side wall portions are integrally formed in the high-temperature gas passage. A high-temperature gas flow regulating member made of an extruded aluminum material having a long opening in the left-right direction is disposed at the upper and lower middle portions of the rear wall portion, and is provided on the heat transfer partition. A heat exchanger which is fixed and has a high-temperature gas flow restricting member for allowing high-temperature gas to flow along the inner surface of the heat transfer partition.