JPH1047879A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a contacting area with internal fluid and improve a heat exchanging rate by providing a plurality of fins of the inner peripheral surface of a tube for a heat exchanger. SOLUTION: The tube 1 for a heat exchanger is formed of a tube having a rectangular section while inner fin plates 3, having a continuous recessed and projected section, are installed in respective tubes 1. The tube 1 is manufactured by the extrusion forming of aluminum or aluminum alloy and the upper surface as well as the lower surface of the inner surface are provided with a plurality of fins 1a, 1b with an equal interval. The purpose of providing the fins 1a, 1b is the prevention of the lateral (the direction of an arrow sign X in a diagram) vibration of the inner fin plates 3 by abutting the fins against the side surfaces of respective projections of the inner fin plates 3 as well as the increase of the internal surface area of the tube 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger and, more particularly, to heat exchange between an internal fluid passing through tubes arranged in parallel at intervals and an external fluid passing between the tubes. It relates to a heat exchanger.

[0002]

2. Description of the Related Art A heat exchanger is used for exchanging heat between intake air as an internal fluid and outside air as an external fluid, for example, when cooling the intake air of an internal combustion engine in a vehicle. This heat exchanger has a structure in which a plurality of tubes for introducing an internal fluid are arranged in parallel at a predetermined interval. When the internal fluid passes through the tubes, an external fluid (for example, Heat exchange with the outside air or other cooling air).

[0003] As a method of manufacturing the heat exchanger, a plurality of tubes having the same shape are manufactured, the tubes are arranged in parallel at a predetermined interval, and both ends of the tubes are supported by support members. Conventionally, the tube constituting the heat exchanger is formed by winding a metal plate in a cylindrical shape and brazing the joined portion, or brazing the two divided metal plates in a cylindrical shape, and brazing both sides. It is produced by a sheet metal work such as a procedure of performing.

[0004]

In the above-mentioned conventional heat exchanger, since the inner surface of the tube is a flat surface, the contact area between the inner surface and the internal fluid is small, and the heat exchange rate is low. There is a problem that there is a great restriction in achieving the improvement. Further, when an inner fin plate having a continuous uneven cross section is inserted into the tube, the inner fin plate is liable to be vibrated in the lateral direction and easily damaged, resulting in a short life.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a heat exchanger capable of improving the heat exchange rate and preventing the vibration of the inner fin plate. It is an object.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a heat exchanger according to the present invention is provided which comprises an internal fluid passing through tubes arranged in parallel at intervals and an external fluid passing between the tubes. In a heat exchanger for exchanging heat between the tubes, the tube is formed by extrusion.
A plurality of fins are integrally protruded from the inner surface thereof. Also, in the tube,
An inner fin plate having a continuous uneven cross section is inserted. Further, the plurality of fins are arranged side by side on the upper and lower surfaces of the inner surface of the tube so as to abut on the side surfaces of the plurality of protrusions of the inner fin plate.

In the heat exchanger of the present invention, by providing a plurality of fins on the inner surface of the tube, the total surface area of the inner surface of the tube can be increased. Further, the plurality of fins are respectively brought into contact with the side surfaces of the plurality of convex portions of the inner fin plate inserted into the tube, so that the inner fin plate is restricted in the lateral direction and fixed.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the heat exchanger of the present invention, in which main parts are cut away, and FIG. 2 is a perspective view showing a state in which tubes are arranged in parallel in a stage of manufacturing the tubes shown in FIG. FIG. 3 is a diagram showing a state in which an external fluid has passed through a gap between tubes, and FIG. 4 is a diagram showing a state in which an inner fin plate has been inserted into a tube.
Note that the example described below is merely an example of the present invention, and the present invention includes modifications such as design changes without departing from the scope of the claims.

First, the structure of the heat exchanger will be described.
As shown in FIGS. 1 and 2, each of the tubes 1 has a rectangular cross section, and each tube 1 has an inner fin plate 3 having a continuous uneven cross section (see FIG. 3). Is installed. As the cross-sectional shape of the tube 1, a tube formed in a parallelogram or trapezoidal shape or the like can be used.

A plurality of tubes 1 are arranged in parallel between plate-like support members (header plates) 4 and 5, and gaps 6 between the tubes 1 are provided with outer fins having a corrugated cross section. Seven boards are installed. Further, one support member 4 is provided with a header 8 connected to one end (the left side in FIG. 1) of the tube 1, and a supply pipe 8 a is connected to the header 8. The other support member 5 is provided with a header 9 connected to the other end (the right side in FIG. 1) of the tube 1, and the header 9 is provided with a discharge pipe 9a.

The internal fluid sent from the supply pipe 8a enters each of the tubes 1 from the header 8 (see the arrow A in FIG. 1), and passes through each tube 1 while contacting the inner fin plate 3. . On the other hand, the external fluid (outside air) flows in a direction orthogonal to the longitudinal direction of the tube 1 (see an arrow B in FIG. 1), and passes through the gap 6 between the tubes 1 while contacting the outer fin plate 7. .

With the flow of the internal fluid and the external fluid, heat exchange between the internal fluid and the external fluid is performed,
The internal fluid is cooled or the like. The heat-exchanged internal fluid is sent from each of the tubes 1 to the discharge pipe 9a. Further, the inner fin plate 3 and the outer fin plate 7 are used for efficiently transmitting the heat of the internal fluid and the external fluid. In addition, the inner fin plate 3 and the outer fin plate 7 are manufactured by press-forming an aluminum alloy plate, for example.

As a feature of this embodiment, as shown in FIG. 3, an inner fin plate 3 having a continuous uneven cross section is inserted into a tube 1, and the inner fin plate 3 is provided on the upper and lower surfaces of the inner surface of the tube 1. A plurality of fins 1a and 1b are formed integrally at regular intervals so as to contact the side surfaces of the plurality of projections of the plate 3, respectively. The fins 1a and 1b are formed to extend in the longitudinal direction of the tube 1. Note that fins may be provided on the inner surface of the tube 1.

Thus, by providing the plurality of fins 1a and 1b on the inner surface of the tube 1, the total surface area of the inner surface of the tube 1 can be increased and the heat exchange rate can be improved. In addition, the plurality of fins 1a and 1b are respectively brought into contact with the side surfaces of the plurality of projections of the inner fin plate 3, thereby restricting the inner fin plate 3 in the lateral direction (the direction of the arrow X in FIG. 3) and reducing vibration. Can be suppressed. Upper fin 1a
Restricts the movement of the inner fin plate 3 to the left in FIG. 3, and the lower fin 1b restricts the movement of the inner fin 3 to the right in FIG. Note that the fins 1a and 1b do not necessarily need to be provided at equal intervals, and are preferably arranged so as to restrict the movement of the inner fins 3 in the lateral direction.

FIG. 4 shows an example in which the inner fin plate 30 provided in the tube 10 has a corrugated cross section, like the outer fin plate 7 (see FIGS. 1 and 2) described later. Also in this example, a plurality of fins 10 a and 10 b provided integrally with the tube 10 are in contact with the side surfaces of the convex portion of the inner fin plate 30. In the examples of FIGS. 3 and 4, the fins are in contact with the inner fin plate. However, the present invention is not limited to this.

Next, a method of manufacturing the heat exchanger shown in FIG. 1 will be described. First, a plurality of tubes 1 as shown in FIG. 2 are manufactured by extrusion of aluminum or an aluminum alloy. At this time, the tube 1 is extruded so as to have a rectangular cross section. By adopting extrusion molding, fins can be easily provided on the tube 1. In the extrusion molding, molten aluminum or the like is extruded from a mold having a predetermined shape, and the aluminum or the like is cured by cooling in the mold to form the mold. A rectangular mold is used as the mold. Thus, the aluminum tube 1 having a rectangular cross section can be easily manufactured.

By forming the tubes 1 by this extrusion molding, each of the tubes 1 is accurately formed into a predetermined dimension without distortion of a rectangular cross section in a part thereof. In the portion, a thick portion is prevented from being formed carelessly. further,
By using this extrusion molding, it is possible to form the tube 1 with high dimensional accuracy even when producing a small-sized tube 1. Also, by using extrusion molding, there is no occurrence of a joint or the like on the peripheral surface of the tube 1 unlike sheet metal.

Next, as shown in FIG. 2, a plurality of tubes 1 are arranged in parallel with a gap 6 provided. At this time, a plurality of rectangular openings 4a and 5a are previously formed in the support members 4 and 5, and both ends of the tube 1 are welded to each of the openings 4a and 5a, whereby a plurality of tubes 1 are formed.
Are arranged in parallel with the gap 6 opened. Each of the gaps 6 is provided with an outer fin plate 7 press-formed in a corrugated cross section, and is connected to the upper and lower tubes 1 by welding or the like.

Next, the header 8 is mounted on the support member 4 and the header 9 is mounted on the support member 5. These headers 8 and 9 are manufactured by, for example, lost wax casting or the like, and are attached to the support members 4 and 5 by welding or the like. Thereby, one end (the left side in the figure) of each tube 1 is in a state of being connected to the supply pipe 8a collectively through the opening 4a, and the other end of each tube 1 is provided. (Right side in the figure)
Are collectively connected to the discharge pipe 9a via the opening 5a. The heat exchanger shown in FIG. 1 is manufactured by the above procedure.

[0020]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, by providing a plurality of fins on the inner surface of the tube, the total surface area of the inner surface of the tube can be increased, and as a result, the heat exchange rate can be improved. According to the second aspect of the invention, the heat exchange rate can be further improved. In the invention according to claim 3, in addition to the above effects, the plurality of fins abut on the side surfaces of the plurality of projections of the inner fin plate, thereby restricting and fixing the inner fin plate in the lateral direction. Thereby, vibration and breakage of the inner fin plate can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a heat exchanger according to the present invention, in which main parts are cut away.

FIG. 2 shows a step of manufacturing the heat exchanger shown in FIG.
It is a perspective view showing the state where tubes were arranged in parallel.

FIG. 3 is a diagram showing a state where an inner fin plate is inserted into a tube.

FIG. 4 is a view showing another inner fin plate.

[Explanation of Signs] 1 tube 3 inner fin plate 4, 5 support member 6 gap 7 outer fin plate 8, 9 header 8a supply pipe 9a discharge pipe

Claims (3)

[Claims] 1. A heat exchanger for exchanging heat between an internal fluid passing through tubes arranged in parallel at intervals and an external fluid passing between the tubes, wherein the tubes are formed by extrusion. A heat exchanger, wherein a plurality of fins are integrally provided on an inner surface thereof. 2. The heat exchanger according to claim 1, wherein an inner fin plate having a continuous uneven cross section is inserted into the tube. 3. The heat according to claim 2, wherein the plurality of fins are juxtaposed on the upper and lower surfaces of the inner surface of the tube so as to abut on the side surfaces of the plurality of protrusions of the inner fin plate. Exchanger.