JP2997815B2 - 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. 6, 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. 7, 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 circulation pipes (53) are inserted into the adjacent through holes (51), and the adjacent hairpin-shaped refrigerant circulation pipes are formed. (53) are connected by a U-shaped connecting pipe (54), and the combustion cylinder (5
A burner (55) was used at one end opening of (0).

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 an inside of the heat transfer partition. It is brazed to the hot gas passage that has been formed and the outer surface of the heat transfer partition,
And a flat tubular refrigerant passage member made of aluminum having a plurality of refrigerant passages therein, wherein the high-temperature gas passage comprises two upper and lower aluminum extruded high-temperature gas flow regulating members fixed to the inner surface of the heat transfer partition, The high-temperature gas flow restricting member is provided with a predetermined interval in the left and right direction between the left and right side walls, the left and right side walls, and a rear wall that integrally connects the rear edges of the left and right side walls. The high-temperature gas flow restricting member is provided with a heat transfer fin that extends and has a distal end in contact with a heat transfer partition, and the high-temperature gas flow restricting member is provided via a fixing member that can position the left, right, up, and down of the two high-temperature gas flow restricting members. And the pitch between adjacent heat transfer fins of the upper hot gas flow regulation member is smaller than the pitch between adjacent heat transfer fins of the lower hot gas flow regulation member. It is obtained by way made.

According to the heat exchanger of the present invention, the high-temperature 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, 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 heat transfer partition via the heat transfer fins of the high-temperature gas flow regulating member, and is transmitted to the refrigerant flowing through the refrigerant passage of the refrigerant passage member through the heat transfer partition and the peripheral wall of the refrigerant passage member. The refrigerant is heated and vaporized. The amount of exhaust gas flowing inside the upper hot gas flow regulating member is larger than the amount of exhaust gas flowing inside the lower hot gas flow regulating member, but the amount of exhaust gas flowing adjacent to the upper hot gas flow regulating member is larger. Since the pitch between the heat fins is made smaller than the pitch between adjacent heat transfer fins of the lower high-temperature gas flow regulating member,
The number of heat transfer fins of the upper high-temperature gas flow restricting member increases and the heat transfer area increases, and the amount of heat transfer from the exhaust gas flowing inside the upper high-temperature gas flow restricting member to the heat transfer partition increases.

Further, in this heat exchanger, since the 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.

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 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 (10) and (11) made of an extruded aluminum material and arranged at predetermined intervals above and below. Each of the high-temperature gas flow restricting members (10) and (11) is composed of left and right side walls (10a) extending vertically.
(11a), the rear walls (10b) (11b) connecting the rear edges of the left and right side walls (10a) (11a), and the left and right side walls (10a) (1
Intermediate wall (10c) (1
1c), rear wall (10b) (11b) and intermediate wall (10c) (11c)
First heat transfer fins (10d) and (11d) provided at right angles to these, and intermediate wall portions (10c) and (11c).
The second heat transfer fins (10e) and (11e) are provided on the front surface of the fin at right angles to the fin. The heat transfer fins (10d), (10e), (11d), (11e), and both heat transfer fins (10d) (10e) (11d) (11
e) and the passage between the left and right side walls (10a) and (11a) (1
2) High-temperature combustion exhaust gas flows in (13). The pitch between adjacent heat transfer fins (10d) (10e) of the upper hot gas flow regulating member (10) is smaller than that of the lower hot gas flow regulating member (11), The number of heat transfer fins (10d) (10e) of the flow control member (10) is
d) The number is larger than the number of (11e), and the heat transfer area is increased. Between the left and right side walls (10a) and (11a) of the upper and lower hot gas flow regulating members (10) and (11), the rear end reaches the rear edge of the left and right side walls (10a) and (11a), and A gas leakage prevention member (17) is provided to prevent exhaust gas from flowing out between the high-temperature gas flow regulating members (10) and (11) to the side. Both high-temperature gas flow control members (10)
(11) is the second heat transfer fin (10e) (11e)
Is fixed to the heat transfer partition (3) via fixing members (16) extending up and down on both left and right side edges, and the rear wall (10b) (11
b) The peripheral edge of the front end of the cylindrical portion (2a) is in contact with the rear surface. The fixing member (16) is composed of a core material (16a) and a core material (16a).
It is formed of a brazing sheet made of a brazing material (16b) covering both sides of the brazing material. Brazing sheet core material (16a) is copper 0.05 ~ 0.20wt%, manganese 1.0 ~ 1.5wt%
And an aluminum alloy containing the remainder aluminum and inevitable impurities. The skin material (16b)
It is made of an aluminum alloy brazing material containing 8.0 to 10.0 wt% of silicon and 0.2 to 0.5 wt% of iron, 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 (15) is a hot gas flow regulating member (10) (1
It is closely attached to the inner surfaces of the left and right side walls (10a) and (11a) of 1). The front edges of the left and right side walls (10a) (11a) are the first
It is cut by the thickness of the portion (14) so that no gap is formed between the second heat transfer fins (10e) (11e) and the heat transfer partition (3). Further, a gas leakage preventing portion (17) is provided integrally with the first portion (14) and the second portion (15). At the upper and lower ends of the second part (15),
The rear projection (15a) is provided integrally, and this rear projection (15a) hits the end of the intermediate wall (10c) (11c) of the high-temperature gas flow regulating member (10) (11), and the gas leakage occurs. The prevention portion (17) is in contact with the rear wall portions (10b) (11b) and the intermediate wall portions (10c) (11c). In the first part (14)
A plurality of holes (18) are 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). The projection (19) has a substantially L-shaped cross section, and a U-shaped cut is made in the heat transfer partition (3). It is formed by bending to. The protrusion (19) was formed by the edge of the hole (18) on the high-temperature gas flow regulating member (10) (11) side contacting the rear bent portion (19a) of the protrusion (19). Hole (20)
Is blocked.

In the hot gas passage (4), the upper end of the passage (12) of the upper hot gas flow regulating member (10), which is located above the upper hot gas flow regulating member (10), and the exhaust pipe ( And a guide path (31) for communicating with the high-temperature gas flow restricting member (11) on the lower side and on both left and right sides of the high-temperature gas flow restricting members (10) and (11). A guide path (32) is provided for communicating the lower end of the passage portion (13) of the lower high-temperature gas flow regulating member (11) with the exhaust pipe (9).

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 inclined on both sides of an aluminum brazing sheet in which both surfaces of a core material (22a) are covered with a brazing material (22b). The brazing sheet is formed into a cylindrical shape to form a header material so that the inclined portions (28) are overlapped with each other, and the inclined portions (28) are formed by brazing the inclined portions (28) of the header material. It was done. 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 (10) (11). , The passage portion (12) of the upper hot gas flow regulating member (11)
It flows upward in the inside and is further discharged from the exhaust pipe (9) through the guide path (31). Similarly, it flows downward in the passage portion (13) of the lower high-temperature gas flow regulating member (11), and is further discharged from the exhaust pipe (9) through the guide passage (32).
At this time, the amount of the exhaust gas flowing in the passage portion (12) of the upper hot gas flow regulating member (10) depends on the amount of the exhaust gas flowing in the passage portion (13) of the lower hot gas flow regulating member (11). However, the fin pitch of the heat transfer fins (10d) (10e) of the upper hot gas flow restricting member (10) is smaller than that of the lower hot gas flow restricting member (11). So that the heat transfer fins (10
d) The heat transfer area of (10e) is larger than that of the lower high-temperature gas flow regulating member (11), and heat transfer to the heat transfer partition (3) is performed efficiently. The heat of the exhaust gas is transferred to the heat transfer partition (3) directly or via the heat transfer fins (10d) (10e) (11d) (11e) while flowing in the hot gas passage (4). (3) and the refrigerant flowing through the refrigerant passage (6) of the refrigerant passage member (5) through the peripheral wall of the refrigerant passage member (5). As a result, the refrigerant is heated and vaporized by the heat of combustion 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.

In advance, a heat transfer partition (3) made of an aluminum brazing sheet, a refrigerant passage member (5) having a galvanized layer (7), high-temperature gas flow regulating members (10) (11), a fixing member (16) made of an aluminum brazing sheet, A header (22) material formed by molding an aluminum brazing sheet into a cylindrical shape and 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) is brought into contact with the edge of the hole (18) of the fixing member (16) on the high-temperature gas flow regulating member (10) (11) side, so that the projection (19) is formed. The hole (20) formed in the thermal bulkhead (3) is closed. Then, the left and right side wall (10
a) The high-temperature gas flow regulating members (10) and (11) are arranged such that the (11a) is in close contact with the outer surface of the second portion (15) of the fixing member (16). At this time, the rear protruding portions (15a) integrally provided at the upper and lower ends of the second portion (15) are connected to the intermediate wall portion (10c).
(11c) and the gas leakage prevention member (1
7) is the rear wall (10b) (11b) and the intermediate wall (10c) (11
corresponds to c). Therefore, the high-temperature gas flow regulating members (10) and (11) are 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 (22) material. Fix with an appropriate jig. Then, the heat transfer partition (3) and the first portion (14) of the fixing member (16), the heat transfer partition (3) and the second heat transfer fins (10e) (10e) ( 11e), the second part (15) of the fixing member (16)
And the right and left side walls (10)
a) (11a) Inner surface, heat transfer partition (3) and refrigerant passage member (5), header (22) inclined portion (28) of material, and refrigerant passage member (5) and peripheral edge of long hole (26) Is 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).

Effect of the Invention According to the heat exchanger of the present invention, since the refrigerant passage member is brazed to the outer surface of the heat transfer partition that closes one end opening of the combustion drum, the two members are fixed in a tight state with a jig having a simple structure. Work can be performed easily, and the brazing of both can be performed reliably. Therefore, it is possible to prevent a gap from being formed between the brazed heat transfer partition and the refrigerant passage member. Further, the heat transfer area of the upper high-temperature gas flow regulating member having the passage portion through which the combustion exhaust gas of the burner flows largely to the heat transfer partition is increased, so that the heat transfer amount is increased. Therefore, the heat exchange efficiency is improved. Further, since the high-temperature gas flow restricting member is fixedly mounted on the heat transfer partition via a fixing member capable of positioning the upper and lower two high-temperature gas flow restricting members in the right, left, up and down directions, the transfer is performed without the need for a jig. The hot partition and the high-temperature gas flow regulating member can be tightly fixed to each other.
The positioning of the two high-temperature gas flow regulating members can be performed with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a heat exchanger according to the present invention. FIG. 1 is a partially cutaway perspective view, and FIG. 2 shows a heat exchanger at a height position corresponding to an upper hot gas flow regulating member. 3 is an enlarged lateral view of the header, FIG. 4 is a partially enlarged view of FIG. 2, and FIG.
The figure is a partially enlarged exploded perspective view, FIG. 6 is a schematic view showing a cooling and heating device, and FIG. 7 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 Passageway, (10) (11) ... high-temperature gas flow regulating member, (10a) (11a) ... left and right side walls, (10b)
(11b) ... Rear wall, (10d) (10e) (11d) (11e) ...
... heat transfer fins.

Continuing from the front page (72) Inventor, Tadayoshi Ohashi, 6,224, Kaiyamacho, Sakai-shi, Osaka, Japan Showa Aluminium Co., Ltd. (56) reference Patent flat 2-169969 (JP, a) JP Akira 64-28494 (JP, a) JP flat 3-51664 (JP, a) (58 ) investigated the field (Int.Cl. ⁷ , DB name) F28D 1/00-9/04 F25B 41/00 F24H 9/00

Claims (1)

(57) [Claims] 1. A cylindrical combustion cylinder having a burner attached to one end, a heat transfer partition made of aluminum for closing an opening of 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 heat bulkhead and having a plurality of refrigerant passages therein, wherein the high-temperature gas passage is formed of two upper and lower aluminum extrusions fixed to the inner surface of the heat transfer bulkhead The high-temperature gas flow restricting member comprises a left and right side wall portion, a rear wall portion integrally connecting the rear edge portions of the left and right side wall portions, and a predetermined space in the left and right direction between the left and right side wall portions. And a heat transfer fin extending vertically and having a tip abutting on a heat transfer partition. Positionable Attached and fixed to the heat transfer partition via a fixing member having an appropriate configuration, the pitch between adjacent heat transfer fins of the upper hot gas flow restricting member, the adjacent heat transfer fin of the lower hot gas flow restricting member Heat exchangers that are smaller than the pitch between them.