JPH0741984Y2 - Fin tube piping joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a structure for joining a pipe to a fin tube constituting a heat exchanger or the like.

<Prior Art> In a heat pump device utilizing solar heat, a fin tube is used for an outdoor heat collecting and radiating panel. The fin tube is formed by extruding an aluminum material that is lightweight and has high thermal conductivity.

On the other hand, a copper tube is often used as the piping joined to the aluminum fin tube because of its ease of processing such as bending and brazing. Therefore, in order to join the fin tube and the pipe, the aluminum material and the copper material are joined together, and it is difficult to use ordinary welding means or brazing means for joining the dissimilar materials.

Therefore, insert a copper tube into the hole of the fin tube,
This copper tube was expanded and crimped, or a short tube made of an aluminum material was argon-welded to a fin tube made of the same aluminum material, and this was screwed to a pipe made of a copper material.

However, in any of the above-mentioned joining means, there are drawbacks in that long-term reliability (durability) such as joining strength and joining surface adhesion is low in terms of joining dissimilar materials, and processing and construction costs are high. there were.

<Problems to be Solved by the Invention> In order to perform the above-described pipe joining more simply, a means for joining the fin tube and the pipe using an adhesive having significantly improved adhesive strength and durability has been proposed.

That is, as shown in the front view of FIG. 3 and the schematic side sectional view of FIG. 4, as a means for joining the pipe 3 to the fin tube 4, a method of interposing an adhesive 5 at the joining portion between the two is adopted. There is. In this means, in order to further increase the bonding strength of the adhesive 5, the pipe 3 is connected to the fin tube 4
The clearance that occurs when the pipe is inserted into the hole, that is, the difference between the outer diameter Φ ₁ of the pipe 3 and the inner diameter Φ ₂ of the fin tube 4 must always be within a certain range. However, this requires a great increase in the processing accuracy of the pipe 3 and the fin tube 4, resulting in high cost.

On the other hand, if the central axes of the pipe 3 and the fin tube 4 are not aligned, the gap O formed between the pipes 3 and the fin tube 4 is widened to partially cause excess or deficiency of the adhesive agent, as shown in FIG. That is, the adhesive flows out in the excess portion. In addition, sufficient adhesive strength and adhesiveness cannot be obtained in the insufficient portion. For this reason, joining using the above-mentioned adhesive cannot be applied to the joining structure of piping which uses high-pressure refrigerant, such as a heat radiation panel.

<Means for Solving the Problems> The present invention has been devised to solve the above problems, and a plurality of ridges are formed on the joint outer peripheral surface of the pipe or the joint inner peripheral surface of the fin tube. Is a joint structure in which a groove for holding an adhesive is formed between the respective ridges that are provided,
The plurality of ridges are made of a flexible material that collapses due to friction with the joint outer peripheral surface or the joint inner peripheral surface when the pipe is fitted into the hole of the fin tube.

<Operation> When the pipe is fitted into the hole of the fin tube, the ridge body made of a flexible material that collapses due to friction with the joint outer peripheral surface of the pipe or the joint inner peripheral surface of the fin tube Since it is erected on the surface or the outer peripheral surface of the joint, the above-mentioned ridges form the outer peripheral surface of the joint and the inner peripheral surface of the joint even if the difference between the outer diameter of the pipe and the inner diameter of the fin tube is not formed so strictly. It acts as a cushioning material between and fits closely. Moreover, since the volume of the groove between the ridges is narrowed by the ridges falling, the adhesive agent held in the groove easily contacts the joint outer peripheral surface or the joint inner peripheral surface.
Therefore, the adhesion of the pipe and the fin tube with the adhesive is ensured.

<Example> Next, the pipe joint structure of the present invention will be described in detail with reference to the drawings.

FIG. 1 (a) is a schematic side sectional view of the pipe 1 fitted in the hole of a fin tube (not shown). This pipe 1
For example, it consists of a copper tube. The joint outer peripheral surface 11 fitted in the hole of the fin tube has a plurality of ridges 12a to 12n.
Are formed. The ridges 12a to 12n are made of a flexible material, and are formed into micro fins by rolling or cutting the outer peripheral surface of the pipe 1, for example. By the ridges 12a to 12n of this, between adjacent ridges, for example, between 12a and 12b, between 12c and 12d in the illustrated example, ...
Are formed with grooves 13a, 13b ... For holding the adhesive. Then, as shown in FIG. 1 (b), the grooves 13a, 13b ... Are filled with the adhesive 13 evenly. As the adhesive 13, for example, an anaerobic adhesive is used.

The pipe 1 configured as described above is fitted into the hole 21 of the fin tube 2 as shown in FIG. Here, the ridges 12a to 12n shown above are formed to have a sufficient height such that the ridges 12a to 12n fall down due to friction with the joint inner peripheral surface 22 of the fin tube 2 as shown in the figure. By forming the ridges 12a to 12n as described above, the plurality of ridges 12a to 12n are rubbed with the joint inner peripheral surface 22 of the fin tube 2 and the volume of the grooves 13a and 13b is increased during the fitting. And is pressed against the joint inner peripheral surface 22. Further, since the volume of the grooves 13a, 13b ... Is narrowed, the adhesive 13 held in the grooves 13a, 13b ... easily contacts the joint inner peripheral surface 22.

Then, after the adhesive 13 is hardened, the ridges 12a to 12n are also integrated with the adhesive 13 and exhibit sufficient bonding strength.

Furthermore, since the ridges 12a to 12n are formed in the shape of micro fins, even when a liquid adhesive is used, the adhesive is sufficiently contained in the grooves 13a and 13b between the ridges 12a to 12n. Retained.

As described above, since the ridges 12a to 12n made of a flexible material are erected on the joint outer peripheral surface 11, the pipe 1 can be easily press-fitted into the fin tube 2 and sufficient joint can be achieved. Strength and adhesion are obtained.

In the description of the above embodiment, the ridges are formed on the joint outer peripheral surface of the pipe, but the present invention is not limited to this, and may be formed on the joint inner peripheral surface in the hole of the fin tube, for example.
The ridge body is not limited to the one formed integrally with the pipe or the fin tube, and may be formed by attaching a mat or mesh body made of other metal material or synthetic resin material. On the other hand, the adhesive is not limited to a liquid adhesive, and microcapsules containing the adhesive may be arranged in the grooves between the ridges. In this case, when the pipe is press-fitted into the fin tube, the ridges collapse due to their flexibility, whereby the microcapsules are damaged and the adhesive inside is released.

<Effects of the Invention> As described above, according to the fin tube piping joint structure of the present invention, the fin tube made of a flexible material is erected on the joint inner peripheral surface or the joint outer peripheral surface, so that the fin tube is formed. When the pipe is fitted into the hole, the ridges collapse due to friction to reduce the volume of the groove between the ridges and reduce the volume of the groove between the adhesive and the joint inner peripheral surface or the joint outer peripheral surface. It becomes possible to ensure the contact between the fin tube and the pipe, and it is possible to greatly improve the bonding strength and the adhesiveness between the fin tube and the pipe. Therefore, the adhesive can be used for joining pipes using high-pressure refrigerant such as the peripheral heat dissipation panel. Also, since the ridge body made of a so-called flexible material plays a role of a cushioning material between the inner peripheral surface of the joint and the outer peripheral surface of the joint, the fin tube pipe is closely fitted to the outer peripheral surface of the pipe. It is not necessary to form the difference between the inner diameter of the fin tube and the inner diameter of the fin tube so strictly, and the manufacturing cost can be significantly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a schematic side sectional view showing a pipe in which a protrusion is formed, and FIG. 1 (b) is a schematic side sectional view showing a state in which an adhesive is filled. FIG. 3 is a schematic cross-sectional view for explaining a pipe joint structure, FIG. 3 is a schematic front view showing a joint state between a pipe and a fin tube, and FIG. 4 is a schematic cross-sectional view for explaining a conventional joint structure. The figure is a view for explaining the deviation of the central axes of the fin tubes and the piping. 1 …… Piping, 11 …… Joint outer peripheral surface, 12a, 12n …… Projection body, 13a,
13b …… Groove, 13 …… Adhesive, 2 …… Fin tube, 21 ……
Hole, 22 …… Inner surface of the joint.

Claims (1)

[Scope of utility model registration request] 1. In a joint structure in which a pipe is fitted in a hole of a fin tube, a plurality of ridges are provided upright on a joint outer peripheral surface of the pipe or a joint inner peripheral surface of the fin tube, and the respective ridges are provided. A joint structure in which a groove for holding an adhesive is formed between the bodies, wherein the plurality of ridge bodies are formed in the joint outer peripheral surface or the joint when the pipe is fitted in the hole of the fin tube. A pipe joining structure for fin tubes, which is made of a flexible material that collapses due to friction with the peripheral surface.