JP2005114199A - Header for heat exchanger and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a header for a heat exchanger, having a simple structure, and having an excellent brazing property of a tube 1 and an outlet/inlet pipe 8, and to provide a manufacturing method thereof. <P>SOLUTION: In a header body 6, a locking recessed part 4 is formed in one edge part in a width direction of a plate, an engaging projecting part 5 is formed in the other edge part, the plate is sequentially bent in the width direction and is formed in a pipe shape, and thereby, the locking recessed part 4 is fitted on the engaging projecting part 5. The header body 6 is arranged with a large number of tube insertion holes 11 in parallel, and is formed with a pipe insertion hole 12 for the outlet/inlet pipe 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, a header of a heat exchanger is configured by bending a sheet of aluminum brazing sheet coated with a brazing material into a tubular shape by bending it in the width direction and closing both ends thereof. About things.

  In general, a header of a heat exchanger has a header body formed in an elongated box shape and an elongated header plate that closes an open end thereof. A number of tube insertion holes are formed in the header plate, and pipe insertion holes are formed in the header body. Next, as a header for a simpler heat exchanger, a plate made of an elongated brazing sheet made of aluminum is bent into a tubular shape, and a large number of tube insertion holes are juxtaposed on one side and an entrance on the other side. What formed the penetration hole of a pipe is known (for example, refer to patent documents 1).

In addition, a large number of inverted trapezoidal convex edges are provided in parallel on one edge of the butted edge that is bent into a tubular shape, and a concave edge that aligns with the convex edge is formed in parallel on the other edge. However, a combination of both has been proposed. (For example, see Patent Document 2)
In this proposal, in order to perform brazing satisfactorily, the outer surface sides of both edges fitted to each other are plastically deformed into a wedge shape in cross section, and a brazing material is arranged on the surface of the deformed portion.

JP-A-3-84397 (FIGS. 1 and 4) Japanese Patent Laid-Open No. 2-16285 (FIGS. 11 to 13)

A header formed by forming a thin and long plate made of an aluminum brazing sheet having a brazing material on the surface into a circular tube has a feature that the number of parts is small and the structure is simple. However, among the above-mentioned known examples, the former may cause a gap in the abutting portion and cause a brazing failure.
In the latter case, molding and fitting of the abutting edge portion into a wedge shape are troublesome, and there is a possibility that the fitting portion is deformed and a gap is formed during the fitting. In any case, there was a drawback that the brazing of that part was not reliable.
Therefore, an object of the present invention is to provide a header of a heat exchanger that can be formed by brazing a single plate made of an aluminum brazing sheet and brazing the joint accurately, and a method for manufacturing the header.

According to the present invention, the heat exchanger core is constituted by a large number of parallel flat tubes (1) and a large number of fins (2) disposed between adjacent flat tubes (1). And
A plate of a heat exchanger in which the plate is bent into a tubular shape, arranged at the end of the core, the end of the flat tube (1) is inserted, and the insertion and the tubular seam are brazed and fixed ( In 3)
A locking recess (4) having a retaining means (4a) in the width direction is formed at one edge in the width direction of the plate by cutting at a right angle to the edge cut surface, and the other edge An engaging convex portion (5) that aligns with the engaging concave portion (4) is protruded and formed integrally by cutting at a right angle to the edge cut surface, and the engaging concave portion (4) and the engaging convex portion ( 5), the inflection part of the outer periphery is formed into a smooth curve,
The plate is bent in the width direction sequentially to form a rectangular tube, and the engaging recess (4) is fitted into the locking recess (4) to form a header body (6).
A number of tube insertion holes (11) are juxtaposed around the header body (6)
It is a header of a heat exchanger in which end caps (7) are closed at both opening ends in the longitudinal direction of the header body (6). (Claim 1)

In the above configuration, the outer circumference of the header main body (6) can be formed in a circular or square shape. (Claim 2)
Further, in the above configuration, when the outer periphery of the cross section of the header body (6) is square, a locking recess (4) having retaining means (4a) in the width direction is provided on one edge in the width direction of the plate. In addition to forming in a planar manner, an engaging convex portion (5) that aligns with the engaging concave portion (4) on the other edge is integrally formed in a planar manner.
The plate is bent in the width direction sequentially to form a rectangular tube, and the engaging recess (4) is fitted into the engaging recess (4) to form the header body (6).
A large number of tube insertion holes (11) are arranged in parallel on one plane of the outer periphery of the header body (6), and a pipe insertion hole (12) of the inlet / outlet pipe (8) is formed on the other plane,
The end lid (7) can be closed at both opening ends in the longitudinal direction of the header body (6). (Claim 3)

Further, in the above configuration, when the outer periphery of the cross section of the header body (6) is formed in a circular shape, a locking means having a retaining means (4a) in the width direction is provided at one edge in the width direction of the plate. A concave portion (4) is formed on the curved surface, and an engaging convex portion (5) that aligns with the concave concave portion for locking (4) on the other edge is integrally formed on the curved surface.
The plate is sequentially bent in the width direction to form a circular tube, and the engaging protrusion (5) is fitted to the locking recess (4) to form a header body (6).
A number of tube insertion holes (11) are arranged in parallel on the outer periphery of the header body (6), and a pipe insertion hole (12) of the inlet / outlet pipe (8) is formed.
The end lid (7) can be closed at both opening ends in the longitudinal direction of the header body (6). (Claim 4)
In the above configuration, the end cap (7) can be provided with an inlet / outlet pipe (8) and / or a filler neck (9) or a mounting boss projectingly. (Claim 5)

Next, in the method of manufacturing the header of any of the above heat exchangers,
A large number of tube insertion holes (11) are juxtaposed at the center in the width direction of the plate, and the edge of the tube insertion hole (11) protrudes in a burring shape on the inner surface side, and one of the plate width directions Forming the edge in the final shape of the part in advance and bending the other edge in the width direction into a shape opened outward from the final shape of the part; and
Inserting the cored bar (16) in which the burring-shaped part is recessed into the bent plate, and fitting the other edge part around one edge part. I can make it. (Claim 6)
In the above manufacturing method,
The cutting process may be such that an edge burr (17) associated with the cutting is formed on the inner surface side. (Claim 7)

  The header of the heat exchanger of the present invention has a locking recess 4 formed at one edge in the width direction of the plate, and an engaging protrusion 5 that projects from the other edge. Are sequentially bent in the width direction to form a tubular shape, and the header main body 6 having the retaining means 4a is configured by fitting the engaging convex portions 5 into the locking concave portions 4. And since the inflection part of the outer periphery of the recessed part 4 for engagement and the convex part 5 for engagement is formed in the smooth curve, the convex part 5 for engagement is smoothly fitted in the recessed part 4 for latching, and is prevented from coming off The means 4a can be configured. In addition, since the cutting edge portions of the locking concave portion 4 and the engaging convex portion 5 are formed at right angles, it can be manufactured with high accuracy and speed, and the gap between the fitting portions of both can be made as small as possible. The brazing material can be smoothly infiltrated at the time of attachment, and a highly reliable header can be provided.

In the above configuration, in the case where the outer periphery of the cross section of the header body is formed in a circular shape or a square shape, it is easy to form a mold, and the header can be provided at low cost.
In the above configuration, in the case where the outer periphery of the cross section is formed in a square shape and the locking concave portion 4 and the engaging convex portion 5 are formed in a plane, the tube insertion hole 11 and the pipe insertion hole 12 can be easily formed on the respective planes. It is possible to reliably braze the outer periphery of the end of the tube 1 inserted through them and the outer periphery of the end of the inlet / outlet pipe 8. That is, it is easy to uniformly form the tube insertion hole 11 and the pipe insertion hole 12 on each plane of the header 3, whereby the tube 1 and the inlet / outlet pipe 8 and the header body 6 can be brazed uniformly.
Moreover, since the locking concave portion 4 and the engaging convex portion 5 have means 4a for preventing the separation in the width direction, the joint of the plate is securely held and the joint portion is separated by thermal expansion accompanying brazing. Can be prevented.

In the above configuration, the outer periphery of the cross section of the header body 6 can be formed in a circular shape. In this case as well, the locking concave portion 4 and the engaging convex portion 5 formed in a smooth curve on the outer periphery constitute the retaining means 4a in the width direction, facilitating the fitting of both, and the reliability of brazing. Can be secured.
In the above-described configuration, the inlet / outlet pipe 8 and / or the filler neck 9 for supplying water or the mounting boss portion can be projected from the end lid 7.
In this case, it is sufficient to attach the inlet / outlet pipe 8 or the like to the relatively small end lid 7, and the processing and assembly thereof are facilitated.

Next, the manufacturing method of the present invention is to manufacture a header of any one of the above heat exchangers, with the core metal 16 having a recessed portion escaped from the burring portion 15 being inserted into the other, Since the edge portion is wound around one edge portion and the engaging convex portion 5 and the locking concave portion 4 are fitted, both are securely fitted and the gap is made as much as possible. Less, it is possible to ensure the reliability of brazing when brazing between them.
In the above manufacturing method, when the burr 17 is formed on the inner surface side of the plate at the time of the cutting process, the brazing material melted at the time of brazing smoothly enters the joint of the header body, The reliability of brazing can be further improved.

Next, embodiments of the present invention will be described with reference to the drawings.
1 is a perspective view of a main part of a first header of the heat exchanger of the present invention, and FIG. 2 is a cross-sectional view of the main part of the heat exchanger using the header, taken along arrows II-II in FIG. FIG. 3 is a front view of a heat exchanger using the header, and FIG. 4 is a plan view of the heat exchanger. Furthermore, FIG. 5 is explanatory drawing which shows the manufacturing process of the header main body. Moreover, FIG. 6 is explanatory drawing which shows the manufacturing process of the header main body of the 2nd header of the heat exchanger of this invention.

  First, the header of the first example, as shown in FIG. 1, has a header body 6 made of a single plate made of an elongated brazing sheet made of aluminum, with the brazing material being the outer surface side, and the plate is bent in the width direction. Further, both end edges are connected to each other and formed into a rectangular tube. A locking recess 4 is formed in a planar manner at one edge in the width direction, and an engaging projection 5 that aligns with the locking recess 4 is integrally projected in the other edge. Is formed. Both the locking concave portion 4 and the engaging convex portion 5 are constricted on both sides thereof to form the retaining means 4a.

This has a function of preventing the plate from coming off in the width direction by fitting the engaging projection 5 into the locking recess 4. In order to facilitate the fitting, as shown in FIG. 1, the inflection parts 5a and 5b on both sides of the engaging convex part 5 are formed with a smooth curve, and the engaging concave part 4 aligned therewith is also the same. Both sides are formed in a smooth curve.
A large number of tube insertion holes 11 are formed on one side of the header body 6, and in this example, a burring portion 15 is provided on the inner surface side at the hole edge of each tube insertion hole 11. Further, a pipe insertion hole 12 is formed on the other side of the header body 6, and a burring portion is also formed on the inner surface side of the hole edge.
Note that these burring portions can be omitted.

(Header body manufacturing method)
As an example, such a header body 6 can be manufactured in order by press molding as shown in FIGS. In this example, first, a flat plate is formed by cutting an outer peripheral shape using an aluminum brazing sheet coated with a brazing material on the outer surface side and a sacrificial anode material on the inner surface side. At this time, the cutting blade moves from the outer surface side (the brazing material side) to the inner surface side (sacrificial anode side), and a slight burr is generated on the inner surface side (see (G) burr 17). The portion 19 is raised at a right angle to the plane, and the other edge portion 20 is raised so that the inner surface side has an obtuse angle (A). At the same time or subsequently, many tube insertion holes 11 are juxtaposed. The hole edge portion of the tube insertion hole 11 has a burring portion 15 that is burring processed.

  Next, as shown in (B), the plate is bent in the width direction so that the entire cross-section is substantially square except for a part. At this time, the cored bar 16 of (D) is used. The metal core 16 has a substantially square cross section, and a concave portion 18 whose cross section is aligned with the burring portion 15 is formed on one side thereof. The recessed portion 18 is fitted on the burring portion 15 and press-molded on the mold 22 in this state. Then, as shown in (B), only the other edge has a slanted inclined side, and the other is formed into a square. Therefore, next, as shown in FIG. 1E, another metal mold 23 is pressure-bonded to the core metal 16 and the other edge is pushed in, so that the engaging convex part 5 is wound around the engaging concave part 4 as shown in FIG. Fit into. Then, they are combined with no gap, and the cross section is formed into a perfect square cylindrical shape. Therefore, the cored bar 16 is pulled out and a new cored bar (not shown) is inserted to form the pipe insertion hole 12 of FIG.

As shown in FIGS. 2 and 3, the end portions of the tubes 1 are inserted into the respective tube insertion holes 11 of the header main body 6 thus configured, and cooling fins 2 are arranged between the tubes 1. .
A pair of supports 13 are arranged at both ends of the tube 1 in the parallel direction. Then, both ends thereof are inserted into or contacted with flat holes in the header body 6.

Next, the end of the inlet / outlet pipe 8 is inserted into the pipe insertion hole 12. Further, as shown in FIG. 3, a pair of end covers 7 are arranged at both upper and lower ends of the header body 6. In FIG. 3, when the heat exchanger is used for cooling the engine coolant, the filler neck 9 is communicated with the end lid 7 at the upper end of the header body 6 on the right side. When used as an oil cooler or an intercooler, it is not necessary. Moreover, the boss | hub part for attachment may protrude in any heat exchanger.
In the example of FIG. 3, an inlet / outlet pipe 8 communicates with the end lid 7 at the lower end.
A brazing sheet in which a brazing material is previously coated is used on at least one surface of each component connected to each other.

  Then, in the assembled state as shown in FIGS. 3 and 4 (except the cap 10 with pressure valve), the whole is inserted into a high-temperature furnace, the brazing material on the surface of each part is melted, and then cooled and solidified. The parts are brazed and fixed together. At the same time, in FIG. 1 and FIG. 2, both edges in the width direction of the header body 6 are integrally and liquid-tightly brazed and fixed to complete the heat exchanger. At this time, the abutting surfaces of the both edges 19 and 20 in the width direction of the header main body 6 have an extremely small gap that allows the brazing material to enter the inside by capillary action. Moreover, the outer side edge coated with the brazing material is cut slightly toward the inner side as shown in (G) by cutting, which smoothly guides the brazing material to the seam and securely brazes and fixes the joint. To do.

Modified example

Next, FIG. 6 shows an example in which the header has a circular cross section. In this example, one edge 19 in the width direction of the plate is formed in a circle having a quarter of the final shape, and the other edge 20 is A curved surface with a larger curvature radius is formed. Then, it is bent in order as shown in (B) and (C) through the cored bar 16 to obtain a circular cross section.
The first example is a heat exchanger for cooling engine cooling water, but this heat exchanger is not limited to this, and can be used for a condenser for air conditioning, an evaporator, an intercooler, an oil cooler, and the like.

The principal part perspective view of the header of the heat exchanger of this invention. It is a principal part cross-sectional view of the heat exchanger using the header, Comprising: II-II arrow sectional drawing of FIG. The front view which shows an example of the heat exchanger using the header.

FIG. Explanatory drawing which shows an example of the manufacture order of the header main body. Explanatory drawing which shows an example of the manufacture order of the other example of the header main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube 2 Fin 3 Header 4 Locking recessed part 4a Retaining means 5 Engaging convex part 5a, 5b Inflection part 6 Header main body 7 End lid 8 Entrance / exit pipe 9 Fila neck
10 Cap with pressure valve

11 Tube insertion hole
12 Pipe insertion hole
13 Support
14 Mounting hole
15 Burring
16 cored bar
17 Bali
18 Recess
19 Edge
20 edge
21 Brazing material
22 Mold
23 Mold

Claims (7)

A heat exchanger core is composed of a large number of parallel flat tubes (1) and a large number of fins (2) disposed between adjacent flat tubes (1).
A plate of a heat exchanger in which the plate is bent into a tubular shape, arranged at the end of the core, the end of the flat tube (1) is inserted, and the insertion and the tubular seam are brazed and fixed ( In 3)
A locking recess (4) having a retaining means (4a) in the width direction is formed at one edge in the width direction of the plate by cutting at a right angle to the edge cut surface, and the other edge An engaging convex portion (5) that aligns with the engaging concave portion (4) is protruded and formed integrally by cutting at a right angle to the edge cut surface, and the engaging concave portion (4) and the engaging convex portion ( 5), the inflection part of the outer periphery is formed into a smooth curve,
The plate is bent in the width direction sequentially to form a rectangular tube, and the engaging recess (4) is fitted into the locking recess (4) to form a header body (6).
A number of tube insertion holes (11) are juxtaposed around the header body (6)
A header of a heat exchanger in which end lids (7) are closed at both open ends in the longitudinal direction of the header body (6). In claim 1,
The header of the heat exchanger in which the outer periphery of the cross section of the header body (6) is formed in a circle or a rectangle. In claim 2,
The outer circumference of the header body (6) is formed in a square shape,
A locking recess (4) having a retaining means (4a) in the width direction is formed in a planar manner at one edge in the width direction of the plate, and the locking recess ( 4) The engaging projections (5) aligned with
The plate is bent in the width direction sequentially to form a rectangular tube, and the engaging recess (4) is fitted into the locking recess (4) to form a header body (6).
A number of tube insertion holes (11) are arranged in parallel on one plane on the outer periphery of the header body (6), and a pipe insertion hole (12) for the inlet / outlet pipe (8) is formed on the other plane,
A header of a heat exchanger in which end lids (7) are closed at both open ends in the longitudinal direction of the header body (6). In claim 2,
The outer periphery of the cross section of the header body (6) is formed in a circle,
A locking recess (4) having a retaining means (4a) in the width direction is formed on the curved surface at one edge in the width direction of the plate, and the locking recess (4 ) And an engaging convex part (5) aligned with the curved surface.
The plate is bent in the width direction sequentially to form a circular tube, and the engaging recess (4) is fitted into the locking recess (4) to form a header body (6).
A number of tube insertion holes (11) are arranged in parallel on the outer periphery of the header body (6), and a pipe insertion hole (12) of the inlet / outlet pipe (8) is formed,
A header of a heat exchanger in which end lids (7) are closed at both open ends in the longitudinal direction of the header body (6). In claim 1,
A header of a heat exchanger in which an inlet / outlet pipe (8) and / or a filler neck (9) for supplying water or a mounting boss part protrudes from the end lid (7). In the method of manufacturing the header of the heat exchanger according to claim 1,
A large number of tube insertion holes (11) are juxtaposed at the central position in the width direction of the plate, and the edge of the tube insertion hole (11) is protruded in a burring shape on the inner surface side, so that the plate width direction Forming one edge in the final shape of the part in advance and bending the other edge in the width direction into a shape opened outward from the final shape of the part; and
Inserting the cored bar (16) in which the burring-shaped part is recessed into the bent plate, and fitting the other edge part around one edge part. A method for manufacturing a header of a heat exchanger. In claim 6,
A method for manufacturing a header of a heat exchanger, wherein the cutting process is such that an edge burr (17) associated with the cutting is formed on the inner surface side.

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