JP2821642B2 - 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. 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 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 tubular refrigerant passage member has an arc shape, many jigs having a complicated structure are required to manufacture such a heat exchanger, and the jig is required. Therefore, there is a problem that the fixing work between the combustion cylinder and the refrigerant passage member due to the above becomes 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, and the high-temperature gas passage includes an aluminum brazing sheet fixing member. A rear wall portion that is brazed to the inner surface of the heat transfer partition through the rear wall portion, and a rear wall portion that integrally connects the rear edge portions of the left and right side wall portions, and an intermediate wall portion that connects the middle portions of the widths of the left and right side wall portions. And a high-temperature gas flow regulating member made of an aluminum extruded die having upper and lower portions, wherein the fixing member is connected to the close contact portion to the inner surface of the heat transfer partition and the close contact portion to the inner surface of the heat transfer partition, and A portion of the left and right side wall portions that is in close contact with the inner surface of the portion ahead of the intermediate wall portion, a portion that is in close contact with the inner surface of the heat transfer partition and a portion that is in close contact with the inner surface of the left and right side wall portions, and a rear edge portion is a rear edge of the left and right side walls And a gas leakage prevention part that prevents exhaust gas from flowing out from between the upper and lower high-temperature gas flow regulating members to the side, and connected to both upper and lower parts of the gas leakage prevention part and extends both up and down The wing portion is integrally provided, and the wing portion is brought into close contact with any one of the inner and outer surfaces behind the intermediate wall portion in the left and right side walls of the upper and lower hot gas flow regulating members.

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, both brazings are reliably performed. The high-temperature combustion exhaust gas from the burner enters the upper hot gas flow restricting member from the upper and lower hot gas flow restricting members and flows upward through the inside. In addition, it enters the lower high-temperature gas flow regulating member from between the upper and lower high-temperature gas flow restricting members, and flows downward through the inside. The heat of the 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, and the refrigerant is heated and vaporized by the combustion heat of the burner. At this time, gas is prevented from flowing out between the upper and lower high-temperature gas flow regulating members to the left and right sides by the gas leakage preventing portion of the fixing member and the wings integrally provided on the gas leakage preventing portion.

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), It is 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 zinc plating (7) formed on the surface. It comprises 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)
Is a middle part connecting the left and right side walls (11a) extending in the vertical direction, the rear wall part (11b) connecting the rear edges of the left and right side walls (11a), and the center part of the width of the left and right side walls (11a). The first heat transfer fin (11) is provided between the wall portion (11c), the rear wall portion (1b) and the intermediate wall portion (11c) so as to be perpendicular thereto.
d), and a second heat transfer fin (11e) provided on the front surface of the intermediate wall portion (11c) so as to be perpendicular thereto. And the two adjacent heat transfer fins (11d) (11e)
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). 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 between the left and right side wall portions (11a) of the upper and lower hot gas flow regulating members (11) is
a) A gas leakage preventing portion (17) is provided which reaches the trailing edge and prevents the exhaust gas from flowing out between the two high-temperature gas flow regulating members (11) 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 (3) formed between the upper and lower high-temperature gas flow regulating members (11).
0) and flows into the hot gas passage (4). 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 (16a) of the brazing sheet is copper 0.05-0.20 wt%, manganese 1.0-1.
It is formed of an aluminum alloy containing 5 wt%, the balance being aluminum and unavoidable impurities. Leather (16
b) contains 8.0 to 10.0 wt% of silicon and 0.2 to 0.5 wt% of iron,
It is formed of an aluminum alloy brazing material comprising the remaining aluminum and unavoidable impurities. The fixing member (16) has a substantially L-shaped cross-section, and a first member closely contacting the inner surface of the heat transfer partition (3).
It comprises a portion (14) and a second portion (15) protruding rearward from opposing edges of the first portion (14). The second portion (15) is brought into close contact with the inner surface of a portion of the left and right side walls (11a) of the high-temperature gas flow regulating member (11) that is forward of the intermediate wall (11c). Left and right side wall (11
The front edge of a) is cut by the thickness of the first portion (14) so that no gap is formed between the second heat transfer fin (11e) and the heat transfer partition (3). I have. Further, a gas leakage preventing portion (17) is provided integrally with the first portion (14) and the second portion (15). A vertically extending wing portion (17a) is provided integrally with upper and lower portions of the gas leakage prevention portion (17). The wing portion (17a) is bent slightly outward, is brought into close contact with the outer surface of the left and right side wall portions (11a) of the high-temperature gas flow regulating members (11) behind the intermediate wall portion (11c), and brazed. ing. 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). Also, the first part (14)
Has a plurality of holes (18) formed at predetermined intervals in the vertical direction, and a projection (19) provided integrally with the heat transfer partition (3) is fitted into these holes (18). It is brazed to the heat transfer partition (3) in the inserted state. 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: 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.

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) 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). Then, the first portion (1) of the heat transfer partition (3) and the fixing member (16)
4) The heat transfer partition (3), the second heat transfer fin (11e) of the high temperature gas flow regulating member (11), and the second portion (1) of the fixing member (16).
5) and the inner surfaces of the right and left side walls (11a) of the high-temperature gas flow restricting member (11), the wings (17a) of the gas leakage prevention member (17) of the fixing member (16) and the left and right of the high-temperature gas flow restricting member (11). Side wall (11
a) The outer surface, the heat transfer partition (3) and the refrigerant passage member (5), the inclined portion (28) of the header material (29), the refrigerant passage member (5) and the peripheral edge of the long hole (26) are respectively brazed. Attached.
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).

FIG. 8 shows another embodiment of the present invention. In FIG. 8, a vertically extending wing portion (17b) provided integrally with the upper and lower sides of the gas leakage prevention portion (17) of the fixing member (16) is provided with both hot gas flow regulating members (11). ), The inner surfaces of the left and right side wall portions (11a) behind the intermediate wall portion (11c) are closely attached and brazed. Other configurations are the same as in 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 that closes one end opening of the combustion cylinder, both are brought into close contact with a jig having a simple structure. This facilitates the work and ensures that the two are brazed. Therefore, it is possible to prevent a gap from being formed between the brazed heat transfer partition and the refrigerant passage member, and to improve the heat transfer coefficient from the combustion drum to the refrigerant passage member.
In addition, the upper and lower wings are provided integrally with the gas leak preventing portion of the fixing member and the upper and lower portions of the gas leak preventing portion so as to extend from the upper and lower hot gas flow regulating members to the left and right sides. Gas outflow is prevented. As a result, the heat exchange efficiency between the high-temperature gas flowing in the high-temperature gas passage and the refrigerant flowing in the refrigerant passage member is improved.

[Brief description of the drawings]

The drawings show an embodiment of the heat exchanger according to the present invention. FIG. 1 is a partially cutaway perspective view, FIG. 2 is a horizontal enlarged sectional view, FIG. 3 is an enlarged transverse sectional view of a header, and FIG. 5 is a partially enlarged view of FIG. 2, and FIGS. 5 to 7 show a method of manufacturing the heat exchanger shown in FIG. 1. FIG. 5 is a diagram showing a state before a temporary assembly of a heat transfer partition, a high-temperature gas flow regulating member, and a fixing member. FIG. 6 is a view showing 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. 7 is a state after brazing similarly. FIG. 8, FIG. 8 is a diagram corresponding to FIG. 5 showing another embodiment of the present invention, FIG. 9 is a schematic diagram 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, (4) high temperature gas passage, (5) refrigerant passage member, (6) refrigerant Passage, (11) high temperature gas flow regulating member, (11a) left and right side walls, (11b) rear wall,
(11c) ... intermediate wall, (14) ... close contact with the inner surface of the heat transfer partition, (15) ... close contact with the inner surfaces of the left and right side walls of the high-temperature gas flow regulating member, (16) ... fixing member , (17) ... gas leakage prevention part, (17a) (17b) ... wing part, (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. Upper and lower two aluminum extruded die members having left and right side walls, a rear wall portion integrally connecting the rear edge portions of the left and right side wall portions, and an intermediate wall portion connecting the middle portions of the widths of the left and right side wall portions. A gas flow regulating member is provided, and the fixing member is
A portion that is in close contact with the inner surface of the heat transfer partition and a portion that is continuous with the close portion to the inner surface of the heat transfer partition and that is closer to the inner surface of the portion in front of the intermediate wall in the left and right side walls of the high-temperature gas flow regulating member,
Exhaust from the upper and lower high-temperature gas flow restricting members to the side close to the inner surface of the heat transfer partition and to the portion closer to the inner surface of the left and right side walls, and the rear edge coincides with the rear edge of the right and left side walls. A gas leakage prevention part for preventing gas outflow is provided, and wings extending vertically are provided integrally with upper and lower sides of the gas leakage prevention part, and the wings are formed of upper and lower hot gas flow regulating members. A heat exchanger which is brought into close contact with any one of the inner and outer surfaces of the left and right side walls behind the intermediate wall.