JP2001004293A - Heat exchanger and its fabrication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air leakage from an end part of a side plate provided with reinforcing ribs by a method other than pressing and collapsing the end part. SOLUTION: A header pipe 3 or the like is provided with a side plate hole 10 retaining a side plate 8. The side plate 8 is provided with reinforcing ribs 81 in a longitudinal direction of the side plate 8 continuously or intermittently with a specified length. An inserting part 82 inserted into and joined with the side plate hole 10 of the header pipe 3 or the like and a contact part 83 brought into contact with and joined with an outer surface of the header pipe 3 are provided on an end part of the side plate 8 without deforming the reinforcing ribs 81, and the side plate 8 and a part to be joined of the header pipe 3 are brazed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe comprising a plurality of tubes stacked via fins, header pipes provided at both ends of the tubes, and side plates provided between the header pipes. The present invention relates to an exchanger and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, a heat exchanger constructed by stacking a plurality of tubes via fins and connecting each end of these tubes to a header pipe arranged on both sides of a tube layer is known. Are known. According to this configuration,
The heat exchange medium flows in a meandering manner between the inlet and outlet joints provided in the header pipe a plurality of times, and exchanges heat with the atmosphere in the flow process.

[0003] The structural strength of this type of heat exchanger is improved by providing side plates between header pipes. That is, the side plate is joined to the fin located on the outermost side of the tube layer, and is provided with its end supported by each header pipe.

[0004] Usually, tubes, header pipes, fins,
And each member such as a side plate is formed by molding a metal material clad with a brazing material into a predetermined shape, and is assembled using a jig or the like, and the assembled body is placed in a furnace. By sending and heating, it is brazed and integrally formed. In particular, the side plate is provided by inserting and brazing both ends into side plate holes provided at key points of the header pipe.

[0005]

By the way, when the side plate is made thinner for weight reduction, the strength is reduced.
It is conceivable to form reinforcing ribs. However, when this is done, the air flowing between the outermost fin and the side plate flows into the concave portion of the reinforcing rib and flows as it is along the axis of the reinforcing rib in the longitudinal direction of the side plate, and air flows from the end of the side plate. There is a problem of leakage.

In order to avoid this problem, for example, Japanese Patent Application Laid-Open
In the invention described in Japanese Patent Application No. 0-47886, first, a reinforcing rib is formed by roll forming in the longitudinal direction, then cut to a predetermined length, and then the end is crushed and formed flat. However, in this method, the cutting step and the crushing step are required to crush both ends after cutting, and thus there are problems such as an increase in man-hours and deformation in the vicinity of the crushed portion.

Accordingly, the present invention has been made in view of the above problems,
The purpose is to prevent air leakage by methods other than crushing.

[0008]

According to the first aspect of the present invention, a plurality of tubes stacked via fins are provided.
In a heat exchanger including a header pipe disposed at an end of the tube and a side plate disposed between the header pipes, the header pipe includes a side plate hole that holds the side plate, The side plate is continuous in the longitudinal direction of the side plate,
Alternatively, a reinforcing rib is provided intermittently over a predetermined length, and an insertion portion inserted into the side plate hole of the header pipe and joined to an end of the side plate and an outer surface of the header pipe. A heat exchanger in which a contact portion to be contacted and joined is provided without deforming the reinforcing rib, and a joint portion between the side plate and the header pipe is brazed.

Thus, the heat exchanger of the present invention is formed rather than crushed at the end and joined to the header pipe to prevent air leakage from the end of the side plate. The crushing step is unnecessary, so that the man-hour can be reduced and deformation due to the crushing can be prevented.

The second aspect of the present invention is the heat exchanger according to the first aspect of the present invention, wherein the reinforcing rib portion at the end of the side plate is provided so as to abut the outer surface of the header pipe. .

As described above, the reinforcing rib at the end of the side plate abuts against the outer surface of the header pipe, whereby positioning by the end of the side plate and reinforcement by the reinforcing rib are performed, and the structural structure of the side plate is improved. The strength can be further improved.

[0012] According to a third aspect of the present invention, there is provided a fuel cell system comprising: a plurality of tubes stacked via fins; a header pipe provided at an end of the tube; and a side plate provided between the header pipes. In the method of manufacturing a heat exchanger provided with, a substantially U-shaped reinforcing rib having a cross-sectional shape opened upward or downward is formed on a plate material continuously or intermittently over a predetermined length in a longitudinal direction. After that, the plate material is cut to a predetermined length so as not to crush the reinforcing ribs, and an insertion portion to be inserted into the header pipe is formed at the cut end to form a side plate, This is a method for manufacturing a heat exchanger in which the side plate is combined with the fin, the tube, and the header pipe and brazed integrally in a furnace.

As described above, according to the method for manufacturing a heat exchanger of the present invention, when the side plate is cut, the reinforcing rib is not crushed, for example, by cutting the side plate with a mold corresponding to the cross-sectional shape of the reinforcing rib. Since the reinforcing ribs are cut to a predetermined length, the reinforcing ribs are not crushed or deformed, so that there is no gap when joining with the header pipe.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, a heat exchanger 1 according to the present invention comprises a plurality of tubes 2, 2 stacked via fins 5, 5,
The headers 3 and 4 provided at both ends of these tubes 2 and 2 are connected and connected.

Each of the header pipes 3 and 4 has upper and lower end openings closed by caps 6 and 6, the inside of which is partitioned by partition plates 7 and 7 provided at predetermined positions, and further, an inlet for taking a medium into the inside. Joint 3a or outlet joint 4 for discharging the medium to the outside
a is provided. Tube holes 9, 9 are formed at predetermined intervals in the longitudinal direction of each of the header pipes 3, 4. Each tube 2, 2 is provided by inserting and brazing each end of the tube into the tube hole 9, 9.

Further, side plates 8, 8 are arranged above and below the tubes 2, 2 respectively. The side plate 8 is brazed to the outermost fins of the tube layers 2 and 2, and its end is inserted and brazed into a side plate hole 10 provided in each of the header pipes 3 and 4. Thus, the structural strength of the heat exchanger is improved by holding two or two layers of tubes.

According to this configuration, the medium introduced from the inlet joint 3a is meandered a plurality of times so as to reciprocate through the header pipes 3 and 4 in units of a predetermined group of tubes 2 and flows therethrough while exchanging heat. After passing through the tube 2, the outlet joint 4a
Is discharged from In addition, the heat exchange of the medium is performed by the tubes 2,
It is promoted by the heat radiation effect by the fin 5 interposed between the side plates 8 and 2.

In this embodiment, the tubes 2, 2, the header pipes 3, 4, the fins 5, 5, the caps 6, 6, the partition plates 7, 7, and the side plates 8, 8 are each made of a brazing material clad. The above-mentioned metallic material is formed into a predetermined shape, and they are integrally formed by assembling and brazing them.

FIG. 2 shows a side plate according to a first embodiment of the present invention.

The side plates 8 are shown in FIGS.
As shown in (c), reinforcing ribs 8 formed in the longitudinal direction
1, 81, an insertion portion 82 protruding in a tongue shape from an end portion, and wall portions 84, 84 formed by bending both sides at right angles.
Generally, it has a cross-sectional uneven shape over the longitudinal direction.

As shown in FIGS. 3 and 4, the insertion portion 82 of the side plate 8 is inserted into the side plate hole 10 of the header pipe 3 or 4 and brazed.

At the end of the side plate 8, there are provided contact portions 83, 83 which come into contact with the outer surface of the header pipe 3 or 4. That is, these contact portions 83, 83
It is located near the base of the insertion portion 82, the insertion portion 82 is inserted into the side plate hole 10, and is brought into contact with the outer surface of the header pipe 3 or 4, and is joined to the outer surface of the header pipe 3 or 4 by brazing. .

Each of the header pipes 3 and 4 of this embodiment is shown in FIG.
As shown in FIGS. 5 (a) to 5 (b), a plate is provided with tube holes 9 and 9 and side plate holes 10 and 10 and further rounded to form a circular tube. Each contact portion 83 of the side plate 8 has a curvature that fits on the outer surface of the tubular header pipe 3 or 4.

The heat exchanger of this embodiment is closed by brazing the end opening of the reinforcing rib of the side plate against the header pipe, so that not only air leakage is prevented but also its structural strength. Can be improved.

FIG. 6 shows a side plate according to a second embodiment of the present invention.

The difference between the side plate of this embodiment and that of the first embodiment is that, as shown in FIGS. 6A to 6C, the side plate of the first embodiment has two reinforcing ribs. On the other hand, there is one in this example. Therefore, the insertion portion 82 is provided not on the reinforcing ribs but on the reinforcing ribs 81 as in the first specific example.

In this example, the insertion portion 82 is provided on the reinforcing rib 81. In forming the insertion portion 82, the reinforcing rib 81 is not deformed at all and the flat portion of the reinforcing rib is used. An insertion portion 82 is formed.

The insertion portion 82 is formed, for example, by cutting the side plate by sandwiching it with a mold adapted to the cross-sectional shape of the reinforcing rib. Therefore, since the reinforcing rib does not collapse or deform, there is no gap when joining with the header pipe.

In each of the above embodiments, the reinforcing rib is
Although the reinforcing ribs are formed continuously in the longitudinal direction of the side plate, the reinforcing ribs may be provided intermittently over a predetermined length.

[0031]

As described above, according to the first aspect of the present invention, a plurality of tubes stacked via fins, a header pipe disposed at an end of the tubes,
In a heat exchanger including a side plate disposed between the header pipes, the header pipe includes a side plate hole that holds the side plate, and the side plate is continuous in a longitudinal direction of the side plate. A reinforcing rib is provided over a predetermined length, intermittently or intermittently, and an insertion portion inserted into the side plate hole of the header pipe and joined to an end of the side plate; A contact portion that is brought into contact with the outer surface and joined,
A heat exchanger in which the reinforcing ribs are provided without being deformed, and a joint between the side plate and the header pipe is brazed.

Thus, the heat exchanger of the present invention is formed rather than crushed at the end and joined to the header pipe to prevent air leakage from the end of the side plate. The crushing step is unnecessary, so that the man-hour can be reduced and deformation due to the crushing can be prevented.

The second aspect of the present invention is the heat exchanger according to the first aspect of the present invention, wherein the reinforcing rib portion at the end of the side plate is provided so as to contact the outer surface of the header pipe. .

As described above, the reinforcing rib at the end of the side plate abuts against the outer surface of the header pipe, whereby positioning by the end of the side plate and reinforcement by the reinforcing rib are performed, and the structural structure of the side plate is improved. The strength can be further improved.

According to a third aspect of the present invention, a plurality of tubes stacked via fins, a header pipe provided at an end of the tube, and a side plate provided between the header pipes are provided. In the method of manufacturing a heat exchanger provided with, a substantially U-shaped reinforcing rib having a cross-sectional shape opened upward or downward is formed on a plate material continuously or intermittently over a predetermined length in a longitudinal direction. After that, the plate material is cut to a predetermined length so as not to crush the reinforcing ribs, and an insertion portion to be inserted into the header pipe is formed at the cut end to form a side plate, This is a method for manufacturing a heat exchanger in which the side plate is combined with the fin, the tube, and the header pipe and brazed integrally in a furnace.

As described above, according to the method for manufacturing a heat exchanger of the present invention, when the side plate is cut, the reinforcing ribs are not crushed by, for example, being sandwiched by a mold corresponding to the cross-sectional shape of the reinforcing ribs. Since the reinforcing ribs are cut to a predetermined length, the reinforcing ribs are not crushed or deformed, so that there is no gap when joining with the header pipe.

[0037]

[Brief description of the drawings]

FIG. 1 is a front view showing a heat exchanger according to a specific example of the present invention.

2A is a plan view showing an end of a side plate, FIG. 2B is a perspective view showing an end of a side plate, and FIG. 2C is a perspective view of FIG. It is AA sectional drawing.

FIG. 3 is a plan view showing an end of a side plate and a header pipe according to a first specific example of the present invention.

FIG. 4 is a side view showing an end portion of a side plate and a header pipe according to a first specific example of the present invention.

5A is a front view showing a header pipe, and FIG. 5B is a cross-sectional view taken along line BB of FIG. 5A according to a specific example of the present invention.

6A is a plan view showing an end of a side plate, FIG. 6B is a perspective view showing an end of a side plate, and FIG. 6C is a perspective view of FIG. It is EC sectional drawing.

FIG. 7 is a plan view showing an end portion of a side plate and a header pipe according to a second specific example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube 3 Header pipe 3a Inlet joint 4 Header pipe 4a Outlet joint 5 Fin 6 Cap 7 Partition plate 8 Side plate 9 Tube hole 10 Side plate hole 81 Reinforcement rib 82 Insertion part 83 Contact part 84 Wall part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuji Sato 3-13-26 Yaumicho, Higashimatsuyama-shi, Saitama F-term in Zexel Higashimatsuyama Plant (reference) 3L065 BA09

Claims (3)

[Claims] 1. A heat exchanger comprising: a plurality of tubes stacked via fins; a header pipe disposed at an end of the tube; and a side plate disposed between the header pipes. The header pipe has a side plate hole for holding the side plate, and the side plate is provided with a reinforcing rib continuously or intermittently in a longitudinal direction of the side plate over a predetermined length. At the end of the side plate, an insertion portion inserted into and joined to the side plate hole of the header pipe, and a contact portion that contacts and joins the outer surface of the header pipe without deforming the reinforcing rib. A heat exchanger, wherein a joint between the side plate and the header pipe is brazed. 2. The heat exchanger according to claim 1, wherein a reinforcing rib portion at an end of the side plate is provided so as to contact an outer surface of the header pipe. 3. A method for manufacturing a heat exchanger comprising: a plurality of tubes stacked via fins; a header pipe provided at an end of the tube; and a side plate provided between the header pipes. In the plate material, a substantially U-shaped reinforcing rib having a cross-sectional shape opened upward or downward is formed continuously or intermittently in a longitudinal direction over a predetermined length, and thereafter, the plate material is The reinforcing rib is cut to a predetermined length without being crushed, and an insertion portion to be inserted into the header pipe is formed at the cut end to form a side plate. The fin, tube, A method for manufacturing a heat exchanger, comprising combining with a header pipe and brazing integrally in a furnace.