JP2607910B2 - Flat fluid flow pipe with header - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat fluid flow pipe with a header which is applied to, for example, a heat exchanger used as an evaporator of a heating device.

2. Description of the Related Art Conventionally, as a flat fluid flow pipe with a header, both ends of the flat fluid flow pipe are oriented in different directions, and both ends of the flat fluid flow pipe are opened on the peripheral wall of the tubular header. It has been known that it is inserted into the elongated hole and brazed to the peripheral edge of the elongated hole on the peripheral wall of the header.

Generally, the flat fluid flow pipe is made of an extruded aluminum material, and the tubular header is made of an electric resistance welded pipe made of a brazing sheet covered on both sides with a brazing material. Then, the end of the flat fluid flow pipe is inserted into the elongated hole formed in the peripheral wall of the tubular header, and the two are brazed by immersion brazing, furnace brazing, vacuum brazing, etc. A flat fluid flow pipe is formed. Further, the tubular header is made of an extruded aluminum material, and the end of the flat fluid flow tube is inserted into a long hole formed in the peripheral wall of the tubular header, and a ring-shaped ring is formed around the fluid flow tube on the outer peripheral surface of the tubular header. A flat fluid flow pipe with a header may be formed by arranging a brazing material and brazing the both by an immersion brazing method, an in-furnace brazing method, a vacuum brazing method, or the like.

However, when the width of the flat fluid flow pipe becomes large, the accuracy of the extrusion process for making the flat fluid flow pipe decreases, and an uneven gap may be formed between the peripheral edge of the long hole and the peripheral edge of the fluid flow pipe. There is. Therefore, when brazing the flat fluid flow pipe and the tubular header, a uniform and thick fillet must be formed over the entire circumference. Otherwise, there may be places where the brazing strength is not sufficient, and when the internal pressure increases, there is a possibility that leakage may occur from both brazing places. By the way, in order to form a uniform fillet over the entire circumference, it is preferable to braze the flat fluid flow pipe and the tubular header so that the peripheral edge of the tubular header long hole is located in a horizontal plane. However, in the conventional flat fluid flow pipe with a header, since both ends of the flat fluid flow pipe face different directions, if the brazing is performed in the above-described posture, the two headers are separately brazed. And there is a problem that the operation becomes troublesome.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem and to form two headers at the same time by brazing to both ends of a flat fluid flow pipe. An object of the present invention is to provide a flat fluid flow pipe with a header in which a uniform and thick fillet is formed over the entire circumference of a joint portion.

Means for Solving the Problems A flat fluid flow pipe with a header according to the present invention is a flat fluid flow pipe with a header comprising two tubular headers and a flat fluid flow pipe having both ends connected to the respective tubular headers. Wherein both ends of the flat fluid flow pipe are oriented in the same direction, and straight pipe sections of a predetermined length are formed at both ends of the flat fluid flow pipe in respective planes parallel to each other. An elongated hole extending in the axial direction is formed in the peripheral wall of the tubular header, and the peripheral edge of the elongated hole is located in a plane orthogonal to the plane in which the straight pipe portions at both ends of the flat fluid flow pipe are located. And both ends of the flat fluid flow pipe are
This is inserted into an elongated hole formed in the peripheral wall of the tubular header from the outside and brazed to the peripheral edge of the elongated hole in the header peripheral wall.

The flat fluid circulation pipe with a header according to the present invention has a structure in which both ends of the flat fluid circulation pipe are oriented in the same direction, and both ends of the flat fluid circulation pipe have predetermined lengths located in planes parallel to each other. Is formed, and the peripheral edge of the long hole formed in the peripheral wall of the tubular header is located in a plane orthogonal to the plane in which the straight pipe sections at both ends of the flat fluid flow pipe are located. Therefore, when manufacturing this, by directing the both ends of the flat fluid flow pipe in either upward or downward direction, and inserting both ends of the flat fluid flow pipe into the long holes of the respective tubular headers from the outside, The joint between the peripheral edge of the long hole of each tubular header and the outer peripheral surface of the flat fluid flow pipe can be simultaneously located in the horizontal plane.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment shows a case where the flat fluid flow pipe with a header according to the present invention is applied to a heat exchanger used as an evaporator of a heating device. Also, in the following description,
The term "aluminum" includes pure aluminum as well as aluminum alloys. In the following description, the front and rear are based on the length direction of the combustion chamber body,
The front indicates the direction indicated by the arrow (A) in FIG. 1, and the rear indicates the opposite side. Furthermore, the upper and lower parts are shown in FIG.
2 and FIGS. 5 to 10 indicate the upper and lower sides, and left and right indicate the left and right sides of FIGS. 2 and 6 to 10.

1 to 3 show a heat exchanger used as an evaporator of a heating device.

1 to 3, the heat exchanger (1) comprises a top wall portion (2) and left and right side wall portions (3) extending downward from the left and right side edges of the top wall portion (2). A combustion chamber body (4) made of aluminum and opened downward, and a combustion chamber body (4) caulked at the front and rear ends of the combustion chamber body (4).
An aluminum lid (5) for closing the front and rear ends of the opening; an aluminum corrugated fin (6) disposed between the left and right side walls (3) and brazed to the left and right side walls (3), respectively; An aluminum flat fluid flow pipe (7) having a number of heat medium flow paths (8) and brazed to the outer surfaces of the left and right side walls (3), respectively; and both flat fluid flow pipes (7) And an aluminum straight tubular header (9) brazed at each end of the aluminum alloy.

The top wall portion (2) of the combustion chamber main body (4) has an arc shape whose central portion protrudes upward. The left and right side wall portions (3) are continuous with the left and right side edges of the top wall portion (2), have the same radius of curvature as the top wall portion (2), and have an arc-shaped portion (11) whose central portion protrudes outward. And a vertical portion (12) extending downward from the lower edge of the arc-shaped portion (11). And the top wall (2)
And the arc-shaped portions (11) of the left and right side walls (3) are formed to have a circular cross section. In addition, vertical part (12)
An outer horizontal bent portion (13) is integrally provided on the lower edge of the lower portion.

A portion (14) of a U-shaped cross section is provided on a portion of the entire periphery of the lid (5) except for the lower edge, and the holding portion (14) is used to form the combustion chamber body (4). ) Is fixed to the combustion chamber body (4) by clamping the front and rear ends. The lid (5) at the front end has an opening for oil burner insertion (15).
Are formed.

The corrugated fin (6) is arranged so that its flat part is on a vertical plane perpendicular to the front-rear direction.

The flat fluid flow pipes (7) with headers each have a heat medium flow passage (8) extending in the circumferential direction of the arc-shaped portions (11) of the top wall (2) and the left and right side walls (3). The left and right side walls (3) are brazed in close contact with the outer surfaces thereof so as to extend. The upper and lower ends of the left flat fluid flow pipe (7) are bent horizontally so as to face leftward, respectively, and the upper and lower ends of the flat fluid flow pipe are bent (16) (straight pipe section).
However, it is inserted into an elongated hole (24) extending in the axial direction formed in the peripheral wall of the straight tubular header (9) and brazed to the peripheral edge of the elongated hole (24) in the peripheral wall of the header (9). The upper and lower ends of the right flat fluid flow pipe (7) are bent horizontally so as to face rightward, and the upper and lower ends of the flat fluid flow pipe (7) are bent (16) (straight pipe section). ) Is inserted into an axially extending elongated hole (24) formed in the peripheral wall of the straight tubular header (9) and brazed to the peripheral edge of the elongated hole (24) in the peripheral wall of the header (9). Further, among all the partition walls (17) partitioning the adjacent heating medium flow passages (8) of the flat fluid flow pipe (7), a plurality of partition walls at predetermined intervals in the front-rear direction are other ones. It is made thicker than things. Thick bulkheads are indicated by (17A).

The lower header (9) is an entrance header, and its front ends and rear ends are substantially U when viewed from a plane.
A pair of front and rear aluminum tubular connecting members (1
8), and is formed by a header (9) and a connecting member (18) into a rectangular shape that is long in the front-back direction when viewed from a plane. The heat medium inlet pipe (19) is connected to the front connection member (18), and the oil drain pipe (21) is connected to the rear connection member (18). Upper header (9)
Is an outlet side header, and its rear end is connected to an aluminum collecting pipe (22) extending in the left-right direction and having both ends closed. The front end of the outlet header (9) is closed. Then, the heat medium outlet pipe (23) is connected to the collecting pipe (22).
Is connected. The surface of the material for forming the tubular connecting member (18) and the collecting pipe (22) is immersed in a galvanizing bath in a non-energized state to form an ultra-thin zinc film. It is preferable to form a galvanized layer by an electroplating method using a plating bath, and then apply a corrosion-resistant treatment to diffuse zinc by heating the galvanized layer.

FIG. 4 shows a heating device using the heat exchanger (1) as an evaporator.

The heating device uses, for example, freon as a heat medium, and includes an indoor unit (26) and an outdoor unit (27). The indoor unit (26) has a condenser (31) and a blower (32) provided in a casing (30) having an air inlet (28) and an air outlet (29). The heat exchanger (1) is disposed in the casing (33) of the outdoor unit (27), and has an inlet header (9), an outlet header of the condenser (31), and an outlet header (9). And the inlet header of the condenser (31) are connected by conduits (34) and (35), respectively. In the casing (33) of the outdoor unit (27), a check valve (36) and a receiver (37) are provided in this order from the condenser (31) side in the middle of the one conduit (34). A check valve (38) is provided in the middle of the other conduit (35).
An oil burner (39) is arranged in the combustion chamber body (4) of the heat exchanger (1), and the heat medium flowing through the flat fluid flow pipe (7) is heated and vaporized by the heat of combustion of the burner (39). I am being squeezed. The combustion chamber body (4)
An exhaust gas pipe (not shown) whose distal end extends to the outside of the casing (33) is connected to the lower end opening of the, and exhaust gas is released into the atmosphere by the exhaust gas pipe.

In such a configuration, the combustion gas of the oil burner (39) flows downward through the space between the fins (6) between the left and right side walls (3). The liquid heat medium flowing from the heat medium inlet pipe (19) into the flat fluid flow pipe (7) through the inlet side header (9) flows through the flow path (8) of the fluid flow pipe (7). It is heated and vaporized by the heat of combustion of the oil burner (39), flows from the outlet header (9) through the heat medium outlet pipe (23) into the conduit (35), passes through the conduit (35), and passes through the condenser (31).
Sent to Then, while passing through the condenser (31), the casing (3) passes through the suction port (28) by the blower (32).
0) Heat is radiated into the room air sucked into the liquefier,
It is sent to the inlet header (9) of the heat exchanger (1) through 4). The air that has taken heat from the heat medium passing through the aggregator (31) in the casing (30) is blown into the room from the outlet (29), and the room is heated by the air.

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

5 and 6, a plate-like combustion chamber body material (41) made of an aluminum brazing sheet whose upper surface is covered with an aluminum brazing material layer (42), and a flat fluid flow pipe (7). ), A corrugated fin (6) and a tubular header (9) are prepared. Combustion chamber body material (41)
In the central portion of the width of, a ridge (43) projecting upward and opening downward has a substantially inverted W-shaped cross section over the entire length. From the lower end of the left and right side walls of the ridge (43) to the left and right side edges of the top wall, respectively, the same radius of curvature as the arc-shaped portion (11) in the left and right side walls (3) of the combustion chamber main body (4) and A portion (44) to be an arc-shaped portion (11) having the same arc length is formed. The two arc-shaped portions (44) are connected to each other by a connecting wall (45) having an arc-shaped cross section that is recessed downward and opened upward. This connecting wall (45) is a portion to be the top wall (2) of the combustion chamber body (4). The combustion chamber body material (41) is immersed on both sides of a flat brazing sheet in a galvanizing bath with no current applied to form an ultra-thin zinc film, and then electroplating using the same galvanizing bath as above It is formed by forming a galvanized layer by a method and then performing bending. Flat fluid flow pipe (7)
After immersing the surface of a straight extruded mold material in a galvanizing bath in a non-energized state to form an extremely thin zinc film, the galvanized layer is formed by an electroplating method using the same galvanizing bath as described above. It is formed by forming and then bending. The tubular header (9) is formed by forming a long hole in the peripheral wall of an electric resistance welded tube made of a brazing sheet whose inner and outer surfaces are covered with an aluminum brazing material layer (46).

Next, the bent portions (16) at both ends of the two flat fluid flow pipes (7) are directed straight upward, and each header (9) is fitted so that the bent portions (16) are fitted into the elongated holes (24). Is placed horizontally on both ends of the flat fluid flow pipe (7),
The flat fluid flow pipe (7) extends along the horizontal portion (47) on both sides of the ridge (43) on the upper surface of the material (41) and the arc-shaped portion (44). At this time, the periphery of the long hole (24) comes within the horizontal plane. Further, the corrugated fin (6) is made to extend along the lower surface of the horizontal portion (47) of the material (41) via the plate-shaped brazing material (48). Then, the material (41), the flat fluid flow pipe (7), the header (9), and the fins (6) are fixed with a jig (not shown).

Thereafter, the combustion chamber body material (41) and the flat fluid flow pipe (7), the flat fluid flow pipe (7) and the header (9), and the combustion chamber body material (41) and the fin (6) are respectively brazed. (See FIG. 7). At this time, the brazing material covering both the inner and outer peripheral surfaces of the header (9) flows downward, but since the peripheral edge of the long hole (24) is located in the horizontal plane, the long hole (2
4) A uniform and thick fillet is formed over the entire circumference at the joint between the peripheral edge and the outer peripheral surface of the flat fluid flow pipe (7). In addition, the zinc plating layer formed on the material (41) and the header (9) is diffused into aluminum by heating during the brazing step, so that a zinc diffusion layer for corrosion protection is formed.

Further, the combustion chamber body material (41) is bent downward by the connecting wall (44), and the connecting wall (44) is used as the top wall (2), and the arc-shaped portion (44) and the horizontal portion (47) are on both left and right sides. The wall (3) is used (see FIG. 8). Finally, the lid (5) is swaged to the front and rear ends of the combustion chamber body (4), and the connecting member (18), the heat medium inlet pipe (19), the collecting pipe (22), and the heat medium outlet pipe (23) are connected. Join. Thus, the heat exchanger (1) is manufactured.

9 and 10 show a modification of the brazing method for producing a heat exchanger.

In FIGS. 9 and 10, the tubular header (50)
It is made from extruded aluminum. The two flat fluid flow pipes (7) are bent at both ends (16).
The bent part (16) is fitted into the elongated hole (24) of each header (50) in a horizontal state. At this time, a ring-shaped brazing material (51) is fitted around the fluid flow pipe (7) on the outer peripheral surface of the header (50). Next, on the lower surface of the material (41), the horizontal portions (4
The flat fluid flow pipe (7) extends along the arc-shaped portion (44) from the arc (7). In addition, the corrugated fin (6) is made to extend along the upper surface of the horizontal portion (47) of the material (41) via the plate-shaped brazing material (48). Then, the material (41), the flat fluid flow pipe (7), the header (50), and the fins (6) are fixed with a jig (not shown).

Then, the combustion chamber body material (41) and the flat fluid flow pipe (7), the flat fluid flow pipe (7) and the header (50), and the combustion chamber body material (41) and the fins (6) are brazed, respectively. Attached. At this time, the brazing material (51) flows downward,
Since the periphery of the long hole (24) is located in the horizontal plane, the seam between the periphery of the long hole (24) and the outer peripheral surface of the flat fluid flow pipe (7) is uniform and thick over the entire circumference. A fillet is formed. Others are the same as above.

In the above embodiment, the flat fluid flow pipe of the present invention is applied to a heat exchanger used for an evaporator using a petroleum burner, but is also applied to a heat exchanger used for an evaporator using a gas burner. it can. Further, the present invention can be applied to various other heat exchangers.

Effect of the Invention According to the flat fluid flow pipe with header of the present invention, as described above, at the time of manufacturing the pipe, the joint between the peripheral edge of the long hole of each tubular header and the outer peripheral surface of the flat fluid flow pipe. To
At the same time, they can be located in a horizontal plane. Therefore, both headers can be simultaneously brazed to the flat fluid flow pipe in the same posture. Moreover, when the header is formed of an electric resistance welded pipe whose inner and outer peripheral surfaces are covered with a brazing material, and the header and the flat fluid flowing pipe are brazed using this brazing material, the flat fluid flowing pipe is used. If the openings at both ends are directed upward, the brazing material covering the inner and outer peripheral surfaces of the header flows downward, and is uniformly distributed over the entire periphery at the joint between the peripheral edge of the long hole and the outer peripheral surface of the flat fluid flow pipe. A thick fillet is formed. Also, when the header and the flat fluid flow pipe are brazed using a brazing filler, if the openings at both ends of the flat fluid flow pipe are directed downward, the brazing material will flow downward, and A uniform and thick fillet is formed over the entire circumference at the joint between the flat fluid flow pipe and the outer peripheral surface of the flat fluid flow pipe. Therefore, both are brazed firmly.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heat exchanger to which the flat fluid flow tube of the present invention is applied, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. FIG. 4 is a schematic view showing a heating apparatus using the heat exchanger shown in FIG. 1, and FIGS. 5 to 8 show a method for manufacturing the heat exchanger shown in FIG. FIG. 5 is a perspective view showing the arrangement of the components for the heat exchanger before brazing, FIG. 6 is a sectional view of the same, and FIG.
The figure is a cross-sectional view showing a state after brazing of the components for the heat exchanger, FIG. 8 is a cross-sectional view showing a state in which the material of the combustion chamber body is bent, and FIGS. 9 and 10 produce the heat exchanger. FIG. 9 shows a modified example of the brazing method, and FIG.
FIG. 10 is a diagram corresponding to FIG. (7) ... flat fluid flow pipe, (9) (50) ... tubular header, (16) ... both ends bent portion (straight pipe section) of the flat fluid flow pipe.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshifumi Shimajiri 6,224, Kaiyamacho, Sakai City, Osaka Prefecture Showa A Luluminium Co., Ltd. (72) Inventor Shoichi Furuta 6,224, Kaiyamacho, Sakai City, Osaka Showa A Within Lulunium Co., Ltd. (56) References JP-A-56-42789 (JP, A) JP-A-61-121390 (JP, U)

Claims (1)

(57) [Claims] 1. A flat fluid communication pipe with a header comprising two tubular headers and a flat fluid communication pipe having both ends connected to the respective tubular headers, wherein both ends of the flat fluid communication pipe have the same opening. A straight pipe portion of a predetermined length is formed at both ends of the flat-shaped fluid flow pipe and is located in a plane parallel to each other, and a long hole extending in the axial direction is formed in the peripheral wall of the tubular header. Is formed, and the peripheral edge of the long hole is located in a plane orthogonal to the plane where the straight pipe portions at both ends of the flat fluid flow pipe are located, and both ends of the flat fluid flow pipe are formed in the tubular header. A flat fluid flow pipe with a header which is inserted from the outside into an elongated hole formed in the peripheral wall of the above and brazed to the periphery of the elongated hole in the header peripheral wall.