JP2020143864A - Heat exchanger - Google Patents

Abstract

To provide a heat exchanger capable of suppressing deformation due to a collision with a scattering stone or the like.SOLUTION: A heat exchanger 100 provided in a vehicle comprises a flat cylindrical tube 10 to be laminated. A front end part 20 of the tube 10 arranged so as to face the front of the vehicle has folded end parts 21, 22 where both end parts of a metal plate 8 are folded back, and a joint part 30 that joins the folded end parts 21, 22 to each other. The folded end parts 21, 22 are arranged inside the tube 10.SELECTED DRAWING: Figure 3

Description

The present invention relates to a heat exchanger provided in a vehicle.

Patent Document 1 discloses a heat exchanger in which a joint end portion (joint portion) of a flat heat transfer tube (tube) is arranged toward the front side of a vehicle. This heat exchanger is provided so that the joint end of the flat heat transfer tube projects toward the front of the vehicle.

JP-A-10-259998

However, in the heat exchanger of Patent Document 1, if a flying stone or the like collides with the joint end portion while the vehicle is running, the flat heat transfer tube may be deformed.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat exchanger in which deformation due to collision of flying stones or the like is suppressed.

According to an aspect of the present invention, a heat exchanger provided in a vehicle, the tube having a laminated flat tubular tube, and the front end of the tube arranged facing the front of the vehicle is made of a metal plate. A heat exchanger having a folded end portion in which both end portions are folded back and a joint portion for joining the folded end portions to each other, wherein the folded end portion is arranged inside the tube. Provided.

According to the above aspect, in the heat exchanger, since the folded end portion does not protrude to the outside of the tube, it is possible to prevent flying stones and the like from colliding with the folded end portion when the vehicle is traveling. As a result, the tube is prevented from being deformed by the collision of flying stones and the like.

FIG. 1 is a front view of the heat exchanger according to the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3A is a cross-sectional view of the tube, and FIG. 3B is an enlarged cross-sectional view of part A of FIG. 3A.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a front view showing the heat exchanger 100 according to the present embodiment. For the sake of simplification of the description, the heat exchanger 100 is shown by omitting a part.

The heat exchanger 100 is an outdoor heat exchanger (capacitor) used in the refrigeration cycle of a vehicle air conditioner.

As shown in FIG. 1, the heat exchanger 1 includes a core 2 in which a plurality of tubes 10 and outer fins 3 are laminated so as to be alternately arranged, and two tanks 5 provided at both ends of the core 2.

The members constituting the core 2 are made of a metal such as aluminum. The core 2 is one in which each member is joined to each other and integrated.

FIG. 2 is a cross-sectional view showing a part of the core 2. The tube 10 is a flat tubular flow path member. A corrugated outer fin 3 is provided on the outside of the tube 10. A corrugated plate-shaped inner fin 9 is provided inside the tube 10.

The outer fin 3 and the inner fin 9 are not limited to the corrugated plate shape, and may have other shapes. Further, the core 2 may not include the outer fins 3 and the inner fins 9, and the tubes 10 may be laminated.

When the heat exchanger 100 is operated, heat exchange is performed between the refrigerant (fluid) flowing inside the tube 10 and the air (fluid) flowing outside the tube 10.

FIG. 3A is a cross-sectional view showing the tube 10. The tube 10 is formed into a flat tubular shape by press-molding the metal plate 8. The tube 10 includes a rear end portion 11 obtained by bending a metal plate 8 into a U-shaped cross section, upper and lower flat plate portions 12 and 13 extending from the rear end portion 11 toward the front of the vehicle, and both end portions of the metal plate 8. It has a front end portion 20 which is folded back and joined.

The upper and lower flat plate portions 12 and 13 are formed in a flat plate shape extending substantially parallel to each other. Inner fins 9 are provided between the flat plate portions 12 and 13.

FIG. 3B is an enlarged cross-sectional view showing the front end portion 20. The front end portion 20 has a folded end portion 21 and 22 formed by folding both ends of the metal plate 8 and a joint portion 30 for joining the folded ends 21 and 22 to each other. The folded ends 21 and 22 are arranged inside the tube 10.

The front end portion 20 has bent portions 23, 24 that bend from the folded end portions 21, 22. The bent portions 23 and 24 are bent at substantially right angles. The outer surfaces of the bent portions 23 and 24 are curved with a radius of curvature r1 smaller than the plate thickness t of the metal plate 8.

The front end portion 20 has front portions 33, 34 extending from the bent portions 23, 24 and facing the front of the vehicle. The front surfaces 35 and 36, which are the outer surfaces of the front surface portions 33 and 34, extend in the left-right direction (vehicle width direction) and the vertical direction (vertical direction) of the vehicle and face the front of the vehicle.

The folded end portions 21 and 22 are substantially orthogonal to the front surface portions 33 and 34 (front surfaces 35 and 36) and extend substantially parallel to the flat plate portions 12 and 13.

The front end portion 20 has curved portions 25, 26 that are curved from the front surface portions 33, 34 and extend to the flat plate portions 12, 13. The curved portions 25 and 26 are curved with a curvature larger than that of the bent portions 23 and 24. The outer surfaces of the curved portions 25 and 26 are curved with a radius of curvature r2 larger than the plate thickness t of the metal plate 8. The outer surfaces of the curved portions 25 and 26 form curved surfaces 27 and 28 that gradually incline with respect to the front surfaces 35 and 36.

The heat exchanger 100 is manufactured by sequentially performing the following steps.
A single metal plate 8 is press-processed to form the front end portion 20, the flat plate portions 12, 13 and the rear end portion 11.
-Insert the inner fin 9 between the flat plate portions 12 and 13.
-A core assembly is formed by assembling each member constituting the core 2.
-Assemble the tank 5 to the core assembly to form a heat exchanger assembly.
-The heat exchanger assembly is carried into a heating furnace, and the members are joined by brazing in the heating furnace to form the heat exchanger 100. As a result, the tube 10 is formed with a joint portion 30 in which the folded end portions 21 and 22 are joined by brazing.
-The heat exchanger 100 in which each member is integrated is carried out from the heating furnace.

The heat exchanger 100 manufactured in this way is mounted on the vehicle with the front end portion 20 of the tube 10 facing the front of the vehicle. The heat exchanger 100 is provided on the vehicle by being covered with a grill that takes in cooling air (running wind) from the outside of the vehicle or exposed to the outside of the vehicle.

In a vehicle, forced wind or running wind sent by a fan (not shown) flows from the front to the rear of the vehicle. In the heat exchanger 100, forced wind or running wind air flows between the tubes 10 as shown by arrows C in FIG. In the core 2 of the heat exchanger 100, heat exchange is performed between the air flowing between the tubes 10 and the refrigerant flowing inside the tubes 10.

When a foreign substance such as a pebble collides with the tube 10 while the vehicle is running, the front end portion 20 of the tube 10 receives an impact, so that the tube 10 is prevented from being deformed as described later.

Next, the effect of this embodiment will be described.

[1] According to the present embodiment, the front end portion 20 of the tube 10 has a folded end portion 21 and 22 in which both end portions of the metal plate 8 are folded back, and a joint portion 30 for joining the folded end portions 21 and 22 to each other. And have. Then, the folded end portions 21 and 22 are arranged inside the tube 10.

With this configuration, the front end portion 20 of the tube 10 is prevented from being deformed by a collision such as a stepping stone when the vehicle is running because the folded end portions 21 and 22 do not protrude to the outside of the tube 10.

As a comparative example, in a heat exchanger in which the folded end portion of the tube is projected to the outside of the tube, a stepping stone or the like may collide with the projected folded end portion when the vehicle is running. Therefore, the tube may be deformed by the impact received on the folded end portion (protruding portion).

On the other hand, according to the present embodiment, in the front end portion 20 of the tube 10, since the folded end portions 21 and 22 do not protrude to the outside of the tube 10, a stepping stone or the like collides with the folded end portions 21 and 22 when the vehicle is running. Is avoided. Therefore, it is possible to prevent the tube 10 from being deformed by collision with flying stones or the like.

[2] Further, the front end portion 20 of the tube 10 has front end portions 33, 34 that are bent from the folded end portions 21 and 22 and extend toward the front of the vehicle.

With this configuration, in the front end portion 20 of the tube 10, the rigidity of the front end portions 33 and 34 is increased by the folded end portions 21 and 22 bent with respect to the front end portions 33 and 34. As a result, in the tube 10, even if a stepping stone or the like collides with the front surface portions 33 and 34, the front end portion 20 is suppressed from being deformed by the impact.

[3] Further, the front end portion 20 of the tube 10 has curved portions 25, 26 that are curved from the front surface portions 33, 34 and extend toward the rear of the vehicle.

With this configuration, the curved portions 25 and 26 gradually incline from the front portions 33 and 34 toward the rear of the vehicle, thereby reducing the air resistance and the impact received from flying stones and the like. it can. As a result, in the tube 10, even if a stepping stone or the like collides with the curved portions 25 and 26, the front end portion 20 is suppressed from being deformed by the impact.

Further, the curved portions 25 and 26 are curved with a curvature larger than that of the bent portions 23 and 24, so that a large area of the curved surfaces 27 and 28 is secured. Then, the bent portions 23 and 24 are curved with a curvature smaller than the curved portions 25 and 26, so that the rigidity of the front surface portions 33 and 34 is increased.

[4] Further, the radius of curvature r2 of the curved portions 25 and 26 is configured to be larger than the plate thickness t of the metal plate 8.

With this configuration, the radius of curvature r2 of the curved portions 25 and 26 is formed larger according to the plate thickness t of the metal plate 8. As a result, a large area of the curved surfaces 27 and 28 is secured.
It is possible to prevent the front end portion 20 of the tube 10 from being deformed by a collision such as a stepping stone.

Although the embodiments of the present invention have been described above, the above embodiments are only a part of the application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiments. Absent.

The present invention is applicable not only to outdoor heat exchangers (capacitors) but also to heat exchangers such as radiators, oil coolers, and intercoolers mounted on vehicles.

8 Metal plate 10 Tube 20 Front end 21, 22 Folded end 25, 26 Curved 30 Joint 33, 34 Front 100 Heat exchanger

Claims (4)

A heat exchanger installed in a vehicle
With flat tubular tubes to be stacked
The front end of the tube, which is arranged facing the front of the vehicle,
Folded ends where both ends of the metal plate are folded back, and
It has a joint portion for joining the folded ends to each other, and has.
The folded end is arranged inside the tube,
A heat exchanger characterized by that. The heat exchanger according to claim 1.
The front end further has a front end that bends from the folded end and extends toward the front of the vehicle.
A heat exchanger characterized by that. The heat exchanger according to claim 2.
The front end portion further has a curved portion that curves from the front surface portion and extends toward the rear of the vehicle.
A heat exchanger characterized by that. The heat exchanger according to claim 3.
The radius of curvature of the curved portion is larger than the thickness of the metal plate.
A heat exchanger characterized by that.

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