JPH0712769U - Tube for heat exchanger - Google Patents

Abstract

(57) [Summary] [Objective] To provide a tube for a heat exchanger having high productivity and in which the shape of the inner fin is not limited. [Structure] An uneven portion 14 having a corrugated cross section is provided in an outer region 13 of a central region 11 and outer regions 12 and 13 formed by dividing a strip-shaped plate material 10 into three equal parts in a width direction. Then, the strip-shaped plate member 10 is bent so as to cover the uneven portion 14 with the central region 11 and the outer region 12. Further, the exposed side edge portion 15 of the outer region 12 is integrally welded to form the heat exchanger tube 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger tube, and more particularly to a heat exchanger flat tube having an inner fin.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, as a heat exchanger, for example, as shown in FIGS. 5 and 6, flat tubes 1 and corrugated fins 2 are alternately laminated, and both ends of each flat tube 1 are connected to a first header 3 and a first header 3. There is one in which the inner portion of the first header 3 is divided by a partition plate 5 while being connected to each of the two headers 4.

Then, when a heat medium is injected from an injection pipe 6 provided in the first header 3 of the heat exchanger, the heat medium flows through a large number of flat tubes 1 located in the lower half of FIG. After radiating heat through the corrugated fins 2, it flows into the second header 4, and then circulates through the large number of flat tubes 1 located in the upper half of FIG. It returns to the header 3 again and flows out from the outflow pipe 7.

By the way, in order to increase the heat exchange performance by increasing the contact area with the heat medium, the heat exchanger, as shown in FIG. 7, is made of a clad material whose front and back surfaces are coated with a brazing material. A flat tube 1 is formed by inserting a separate inner fin 9 having a corrugated cross-section into the tube main body 8, and corrugated fins 2 are laminated on the flat tube 1, and one side serving as an outer peripheral surface is covered with a brazing material. After assembling the both ends of the flat tube 1 to the first and second headers 3 and 4 made of the clad material, the inner fin 9 and the corrugated fin 2 are brazed to the tube body 8 by heating in a heating furnace. At the same time, both ends of the flat tube 1 were brazed to the first and second headers 3 and 4 to be integrated.

Therefore, in the flat tube 1, since the inner fin 9 has to be inserted into the tube body 8 at the time of assembling, the number of assembling steps is large and the productivity is low. In particular, if the inner fin 9 has a complicated shape, it is difficult to insert the inner fin 9 into the tube body 8. Therefore, the shape of the inner fin 9 is limited, and desired heat exchange performance cannot be obtained.

Moreover, when the flat tube 1 is assembled to the first and second headers 3 and 4, the inner fin 9 described above may fall off from the tube body 8, which makes the assembly work troublesome. Therefore, it is possible to form the flat tube 1 provided with the inner fin 9 by extrusion molding, but there is a problem that the production cost is significantly increased.

In view of the above problems, it is an object of the present invention to provide a heat exchanger tube which has high productivity and in which the shape of the inner fin is not limited.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the heat exchanger tube according to the present invention is provided with a concavo-convex portion in any one of the central region and the outer region formed by dividing the strip-shaped plate material into three equal parts in the width direction, The strip-shaped plate material is bent so that the front and back surfaces of the area provided with the uneven portions are covered with the remaining areas, and the exposed side edge portions of the outer area are integrally welded. .

[0009]

[Action]

 Therefore, according to the present invention, the inner fin of the tube is formed by a part of the strip-shaped plate material forming the tube body.

[0010]

【Example】

 An embodiment of the heat exchanger tube according to the present invention will now be described with reference to the accompanying drawings of FIGS. As shown in FIGS. 1 to 3, the flat tube according to the first embodiment is formed by a strip-shaped plate material 10 made of a clad material whose front and back surfaces are coated with a brazing material. Of the central region 11 and the outer regions 12 and 13 that are divided into three equal parts, a concavo-convex portion 14 having a corrugated cross-section is formed on the outer region 13 by a roll press (FIG. 1), and the concavo-convex portion 14 of the outer region 13 is centered. By bending to the region 11 side (FIG. 2) and further bending the outer region 12 so as to cover the uneven portion 14, the side edge portion 15 of the outer region 12 is welded and integrated (FIG. 3). ), The flat tube 1 having the outer region 13 as the inner fin is completed.

Then, as described above, the flat tubes 1 and the corrugated fins 2 are alternately laminated, and both ends of each flat tube 1 are attached to the first and second headers 3 and 4, respectively, and then the heating furnace When placed inside and heated, the brazing material of the flat tube 1, the first header 3 and the second header 4 is melted, and the front and back surfaces of the outer region 13 of the flat tube 1 and the inner peripheral surfaces of the central region 11 and the outer region 12 are melted. And are integrated by brazing, and the joints of each component are integrated by brazing. Others are the same as the above-mentioned conventional example, and therefore description thereof will be omitted.

According to the present embodiment, only the side edge portion 15 of the one outer region 12 needs to be welded and integrated, so that the welding process is the same as in the conventional example and the number of production steps does not increase. Moreover, in this embodiment, since the outer region 13 having the uneven portion 14 is formed by being folded inward, the strip-shaped plate member 10 in which only one inner peripheral surface is coated with the brazing material is used if necessary. In this case, there is an advantage that the production cost can be reduced.

Further, the flat tube 1 is not necessarily limited to the one described above. For example, as in the second embodiment shown in FIG. 4, the uneven portion 14 is provided in the central region 11, and the central region 11 The strip-shaped plate material 10 is bent into a substantially Z shape so as to cover the front and back surfaces with the remaining outer regions 12 and 13, respectively, and the exposed side edge portions 15 and 15 of the outer regions 12 and 13 are integrally welded to each other. You may form it. However, in the case of this embodiment, it is necessary to use the strip-shaped plate material 10 whose both surfaces are coated with the brazing material.

In each of the above-described embodiments, the concavo-convex portion 14 having a corrugated cross section is formed on the strip-shaped plate material wound in a coil shape by a roll press, and the concavo-convex portion 14 is bent so as to cover the front and back surfaces thereof and integrated by welding. Since the desired flat tube 1 can be obtained by cutting it into a predetermined length, there is an advantage that continuous production can be performed by an automated production process and the productivity is further improved.

The concave-convex portion 14 does not necessarily have to have a corrugated cross-section, and may have, for example, a sawtooth cross-section, or a large number of projections protruding from both sides or one side in the plate thickness direction, Further, a protrusion having a corrugated cross section and a protrusion protruding in the plate thickness direction may be provided at the same time. Furthermore, in order to improve heat exchange performance, the concavo-convex portion 14 may be provided with a through hole or a cut-and-raised piece. The tube is not limited to a flat tube, but may have a circular cross section, for example.

[0016]

[Effect of device]

 As is clear from the above description, according to the heat exchanger tube of the present invention, the inner fins are formed of a part of the strip-shaped plate material forming the tube body. Therefore, unlike the conventional example, the work of inserting a separate inner fin into the tube body becomes unnecessary, and the number of assembling steps is reduced, so that the tube productivity is improved and the production cost can be reduced. In particular, according to the tube of the present invention, even when it is assembled to the header, the inner fin does not fall off from the tube body unlike the conventional example, so that the assembly work is easy and the heat exchanger itself is not Productivity is improved. Moreover, since the present invention does not insert a separate inner fin into the tube body but folds the strip-shaped plate material in the width direction, an inner fin having a more complicated shape than the conventional example is formed. it can. Therefore, there is an effect that a tube for a heat exchanger having a heat exchange performance superior to that of the conventional example can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a strip plate material for forming a flat tube according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a method of assembling the flat tube according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a flat tube according to a first embodiment of the present invention.

FIG. 4 is a perspective view showing a flat tube according to a second embodiment of the present invention.

FIG. 5 is a front view showing a heat exchanger according to a conventional example.

FIG. 6 is a plan view showing a heat exchanger according to a conventional example.

FIG. 7 is a perspective view showing a method of assembling a flat tube according to a conventional example.

[Explanation of symbols]

1 ... Flat tube, 10 ... Strip plate material, 11 ... Central area,
12, 13 ... Outer region, 14 ... Uneven portion, 15 ... Side edge portion.

Claims (1)

[Scope of utility model registration request] 1. A concavo-convex portion is provided in any one of a central region and an outer region formed by dividing a strip-shaped plate material into three equal parts in the width direction, and the front and back surfaces of the region provided with the concavo-convex portion are left. A tube for a heat exchanger, characterized in that the strip-shaped plate material is bent so as to cover the other region, and the side edge portion of the exposed outer region is welded and integrated.