JPH10197188A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for detecting an airtight inspection to check leakage of medium in case of mounting a cap for blocking an end opening of a header pipe at a position deviated from a normal position. SOLUTION: In the heat exchanger 1 comprising a tube 2 for heat exchanging with medium, and a distributing and concentrating header pipe 3 for the medium to be connected to the tube 2, an end opening 13 of the pipe 3 is covered with a cap 6 having a collar 6a, and a cutout 15 covered with the collar 6a is formed at an end of the pipe 3. The cutout 15 exhibits a V shape, and when the cap 6 is not brazed at a normal position, the cutout 15 is formed at a position exposed from the collar 6a of the cap 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a tube for exchanging heat of a medium and a header pipe for distributing and collecting the medium are connected to each other. When the cap to be closed is not attached to a proper position, the cap can be detected by an airtightness check for checking the leakage of the heat exchange medium.

[0002]

2. Description of the Related Art Conventionally, a tube for exchanging heat of a medium,
A heat exchanger formed by connecting and connecting a header pipe for distributing and collecting the heat exchange medium, for example, a stacked heat exchanger in which a plurality of stacked tubes and a header pipe are connected and connected, and a tube bent in a meandering shape Serpent type heat exchangers and the like in which a heat pipe and a header pipe are connected to each other are known.

FIGS. 5 and 6 are perspective views showing the main parts of a conventional laminated type heat exchanger.
The heat exchanger 20 forms a plurality of tube insertion holes 22 in the header pipe 21 and inserts and brazes the ends of the tubes 24 stacked with the fins 23 into the tube insertion holes 22 to form a header pipe. 21 and the tube 24 are connected and connected. In the figure, 25 is a tube 2
The side plate 25 is provided by inserting an end into a side plate insertion hole 26 formed in the header pipe 21 and brazing the side plate. This is to secure the structural strength of the heat exchanger 20.

[0004] At the end of the header pipe 21, a flange 27a is provided.
Is attached. That is, the end opening 28 of the header pipe 21 is covered with the cap 27 and closed by brazing the flange 27 a to the end of the header pipe 21.

The inside of the header pipe is defined by a partition plate (not shown), and an inlet joint for taking in the medium and an outlet joint for discharging the medium are provided at predetermined positions.

[0006] Therefore, the heat exchange medium is distributed and collected by the header pipe between the inlet joint and the outlet joint, is heat exchanged when passing through the tube, and flows so as to meander several times.

In the process of manufacturing such a heat exchanger, after brazing, an airtight inspection is performed to check whether or not a heat exchange medium leaks after completion by, for example, injecting a gas into the inside. . For example, a blockage of the end opening of the header pipe due to the attachment of the cap and a heat exchanger in which the connection between the header pipe and the tube is incomplete are detected by this airtight inspection and are excluded as defective.

[0008]

Since a heat exchanger for a vehicle is installed adjacent to other equipment in a certain space, its dimensions must be extremely accurate. . In this regard, the cap for closing the opening at the end of the header pipe described above is usually provided with a bush for mounting the vehicle body. If the cap mounting position is slightly different, the heat exchanger is mounted on the vehicle body. Inevitable inconvenience. In particular, since the heat exchanger is brazed with the heat exchanger laid down, the cap tends to be tilted by the weight of the bush at the time of brazing and mounted at a position slightly shifted from the regular position. There is.

That is, FIG. 7A shows the header pipe 2
1 shows a case where the cap 27 is mounted at a proper position, and an end opening 28 of the header pipe 21 is sufficiently covered with a flange 27 a of the cap 27. On the other hand, the cap 27 shown in FIG. 7B is attached at a position slightly inclined (θ degrees) from the normal position. That is, the flange 27a of the cap 27 and the end of the header pipe 21 are brazed in a partially separated state due to the displacement of the cap 27. The cap 27 shown in FIG. 7C is mounted at a position (dimension h) slightly raised from a regular position. Also in this case, the flange 27a of the cap 27 and the end of the header pipe 21 are brazed in a partially separated state due to the displacement of the cap 27.

As shown in FIGS. 7 (b) and 7 (c), a heat exchanger mounted at a position where the cap is displaced from the regular position has a different dimension from the standard because of the displacement of the cap. Must be detected as defective.

However, even when the cap is mounted at a position where the cap is displaced, the end opening is temporarily closed due to the clearance of the flange and the intervention of the brazing material. In such a case, it was not possible to detect such a thing, and therefore, there was an inconvenience that, for the first time, it could be determined as a defective product in the final inspection process that the bush that attached the heat exchanger to the vehicle body was displaced from the vehicle body mounting hole. .

In the case of FIG. 7 (c), since the bush does not deviate from the vehicle body mounting hole, the heat exchanger is mounted on the vehicle body, but the flange of the cap and the end of the header pipe are partially connected. Therefore, the brazing area is insufficient, and as a result, the pressure resistance and the durability are inferior, and there is a possibility that problems such as leakage of the heat exchange medium may occur later.

Accordingly, the present invention provides a heat exchanger in which a cap for closing an end opening of a header pipe is mounted at a position shifted from a regular position by an airtightness inspection for checking medium leakage. It is intended to provide.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a heat exchanger in which a tube for exchanging heat of a medium and a header pipe for distributing and collecting the medium are connected to each other. Is a heat exchanger that is covered with a cap having a flange, and has a cutout formed at the end of the header pipe so as to cover the flange.

As described above, if the notch that covers the flange of the cap is formed at the end of the header pipe, the cap that closes the end opening of the header pipe is shifted to a position shifted from the regular position. When attached, the end of the header pipe and the flange of the cap are partially separated, so that the notch is exposed without being covered by the flange, and the airtightness inside the medium through which the medium flows is incomplete. become. Therefore, with such a configuration, a heat exchanger in which the cap is mounted at a position displaced from the proper position can be detected at the stage of an airtight inspection for checking medium leakage.

Conventionally, when the airtightness is ensured by the clearance of the flange and the intervention of the brazing filler metal, even if the cap is mounted at a position shifted from the regular position, such a heat exchanger is used. Can not be detected by airtight inspection and finally it is determined that it is defective,
The work performed in the post-process was wasted. According to the present invention, a defective product can be detected at the stage of airtightness inspection, so that useless work in a subsequent process can be avoided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to specific examples shown in the drawings.

In FIG. 1, a heat exchanger 1 of the present embodiment has a plurality of stacked tubes 2 and 2 and these tubes 2 and 2
And a pair of header pipes 3 and 4 provided at both ends of the pipe. That is, this heat exchanger 1
Is a fin 5 between the header pipes 3 and 4
A plurality of tubes 2 are laminated by interposing the same, and the end of each tube 2 is inserted into the tube insertion holes 9 arranged in the longitudinal direction of the header pipes 3 and 4 and brazed. Things.

At the end of each of the header pipes 3 and 4, a cap 6 for closing the end opening 13 is mounted. Also,
Each of the header pipes 3 and 4 is provided with an inlet joint 11 for taking in the heat exchange medium and an outlet joint 12 for discharging the taken-in medium to the outside. Further, the inside thereof is provided with a partition provided at a predetermined position. It is partitioned by a plate 7. It should be noted that side plates 8 are arranged above and below the layers of the stacked tubes 2. The side plate 8 is provided by inserting its end into a side plate insertion hole 10 formed in each of the header pipes 3 and 4 and brazing it. In this case, the structural strength of the heat exchanger 1 is ensured by maintaining the stacking distance of the heat exchanger 1 and the distance between the header pipes 3 and 4.

According to this configuration, the heat exchange medium introduced into the heat exchanger 1 from the inlet joint 11 is meandered a plurality of times so as to reciprocate through the header pipes 3 and 4 in predetermined tube group units. It is passed, passes through the tubes 2 and 2 while exchanging heat, and is discharged from the outlet joint 12. Note that the heat exchange of the medium when passing through the tube 2
This is promoted by the heat conduction of the fins 5 interposed between the tubes 2 and between the tube 2 and the side plate 8.

FIG. 2 is a perspective view showing a main part of the heat exchanger 1. In the figure, the end opening 13 of the header pipe 3 is shown.
Is covered with the cap 6, and the flange 6a of the cap 6 is closed by brazing to the end of the header pipe 3.
The end opening of the other header pipe 4 is similarly covered with a cap, but the description is omitted because it is the same as FIG.
In the case of this example, the flange portion 6a has a shape that covers the end opening 13 from outside.

The header pipe 3 is formed by rolling a plate-shaped aluminum material to a predetermined diameter.
4 is a joint between the edges of the aluminum material. The joint 14 is joined by brazing.

At the end of the header pipe 3, a notch 15 is formed to cover the flange 6a of the cap 6. The notch 15 of the present example is formed by cutting a corner of an edge of the aluminum material forming the header pipe 3, and is cut in a V-shape along the seam 14 from the periphery of the end opening 13. Of shape. The notch 15 is closed together with the end opening 13 by brazing the flange 6 a and the end of the header pipe 3. When the cap 6 is mounted at a proper position, the brazing material flows around the v-shaped notch 15 during brazing, so that the brazing defect disappears.

Next, a state in which the flange 6a of the cap 6 and the end of the header pipe 3 are brazed and the cap 6 is mounted on the header pipe 3 will be described.

That is, FIGS. 3A to 3C are side views showing a state where the cap 6 is attached to the header pipe 3.

The cap 6 shown in FIG. 3A is mounted at a proper position. The flange 6a of the cap 6 and the end of the header pipe 3 are brazed in a completely engaged state. The notch 15 is covered with the flange 6a, and the end opening 1
3 and is closed.

On the other hand, the cap 6 shown in FIG.
Is mounted at a position slightly inclined (θ degrees) from the regular position. The flange 6a of the cap 6 and the end of the header pipe 3 are brazed in a partially separated state due to the displacement of the cap 6. As a result, the notch 15 exposes a portion not covered by the flange portion 6a (a v-shaped top in the figure).

The cap 6 shown in FIG. 3 (c) is mounted at a position slightly (dimension h) raised from a normal position. Also in this case, the flange 6a of the cap 6
The end of the header pipe 3 is brazed in a partially detached state due to the displacement of the cap 6. As a result, the notch 15 exposes a portion not covered by the flange portion 6a (a v-shaped top in the figure).

That is, as shown in FIGS. 3 (b) and 3 (c), when the cap 6 is mounted at a position displaced from the proper position, a part of the notch 15 not covered by the flange 6a is exposed. As a result, in the heat exchanger 1, the inside of the heat exchanger through which the heat exchange medium flows is incompletely airtight, and can be detected by an airtightness check for checking medium leakage.

Conventionally, in a case where airtightness is ensured by the clearance of the flange portion or the intervention of a brazing material, even though the cap is mounted at a position shifted from the proper position, such a heat exchanger is used. Can not be detected by airtight inspection and finally it is determined that it is defective,
The work performed in the post-process was wasted. However,
As in this example, when a notch that covers the flange of the cap is formed at the end of the header pipe, the cap that closes the end opening of the header pipe is mounted at a position shifted from the regular position. When the end of the header pipe and the flange of the cap are partially separated from each other, a part of the notch is exposed without being covered with the flange, and the airtightness of the inside through which the medium flows is incomplete. . Therefore, the heat exchanger in which the cap is displaced from the proper position can be detected as a defective product at the stage of the airtight inspection, so that useless work in the subsequent process can be avoided.

Next, another embodiment of the present invention will be described.

As shown in FIG. 4, the heat exchanger 1 of the present embodiment
A support member (a bush) 16 for supporting the heat exchanger 1 is integrally formed by inserting a mounting hole (not shown) of the vehicle body into a cap 6 for closing the end opening 13, and a header thereof. At the end of the pipe 3, a plurality of notches 15, 1
5 is formed. Other configurations are the same as those in the above-described specific example, and thus description thereof is omitted.

The heat exchanger 1 is installed by fixing a projecting support member 16 integrally formed on the cap 6 to a support position on the installation location side.

If the cap 6 is mounted at a position displaced from the regular position, the positional relationship between the support member 16 and the heat exchanger 1 is broken, so that the heat exchanger 1 cannot be installed on the vehicle body. Becomes Further, since the weight of the support member 16 is added to the cap 6, when the heat exchanger is laid down and brazed, the cap 6 is easily mounted at a position shifted from a regular position. For this reason, in this example, at the end of the header pipe 3,
By forming a plurality of notches 15, the reliability of the detection in the airtight inspection is improved.

As described above, when a plurality of notches are formed at the end of the header pipe at appropriate intervals, the cap is inclined or the like, so that the end of the header pipe and the flange are shifted only on one side. If so, any notch will be exposed. Therefore, in the airtightness inspection, it is possible to more reliably detect the heat exchanger in which the cap is mounted at a position shifted from the regular position.

The shape, number, position, forming method, and the like of the notches may be appropriately set according to the case, and are not particularly limited to those of this example.

[0037]

As described above, the present invention relates to a heat exchanger in which a tube for exchanging heat of a medium and a header pipe for distributing and collecting the medium are connected to each other.
An end opening of the header pipe is covered with a cap having a flange, and the end of the header pipe is a heat exchanger having a cutout formed to cover the flange. .

As described above, if the notch for covering the flange of the cap is formed at the end of the header pipe, the cap for closing the end opening of the header pipe may be shifted to a position shifted from the regular position. When attached, the end of the header pipe and the flange of the cap are partially separated, so that the notch is exposed without being covered by the flange, and the airtightness inside the medium through which the medium flows is incomplete. become. Therefore, with such a configuration, a heat exchanger in which the cap is mounted at a position displaced from the proper position can be detected at the stage of an airtight inspection for checking medium leakage.

As described above, conventionally, even when the cap is mounted at a position shifted from the proper position, if the airtightness is secured by the clearance of the flange portion or the intervention of the brazing material, Since such a heat exchanger cannot be detected by the airtightness inspection and is finally determined to be defective, the work performed in the post-process has been wasted. In this regard, according to the present invention, a defective product can be detected at the stage of airtightness inspection, so that useless work in a post-process can be avoided.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a main part of a heat exchanger according to a first specific example of the present invention.

FIG. 3 is a side view showing a state where a cap is attached to an end of a header pipe according to the first specific example of the present invention.

FIG. 4 is a perspective view showing a main part of a heat exchanger according to a second specific example of the present invention.

FIG. 5 is a perspective view showing a main part of a heat exchanger according to a conventional example.

FIG. 6 is a perspective view showing a main part of a heat exchanger according to a conventional example.

FIG. 7 is a side view showing a state where a cap is attached to an end of a header pipe according to a conventional example.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube 3 Header pipe 4 Header pipe 5 Fin 6 Cap 6a Flange part 7 Partition plate 8 Side plate 9 Tube insertion hole 10 Side plate insertion hole 11 Inlet joint 12 Outlet joint 13 End opening 14 Joint 15 Notch 16 Support member 20 heat exchanger 21 header pipe 22 tube insertion hole 23 fin 24 tube 25 side plate 26 side plate insertion hole 27 cap 27a flange 28 end opening

Claims (2)

[Claims] 1. A heat exchanger in which a tube for performing heat exchange of a medium and a header pipe for distributing and collecting the medium are connected and connected, wherein an end opening of the header pipe has a cap having a flange. A heat exchanger, wherein a notch is formed at an end of the header pipe so as to cover the flange. 2. The notch has a v-shape,
The heat exchanger according to claim 1, wherein the notch is formed at a position exposed from the flange of the cap when the cap is not brazed at a regular position.