JPS6222792Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint structure for introducing or discharging a heat exchange fluid into a resin tank in a heat exchanger suitable for an automotive air conditioner.

Some heat exchangers for automobile air conditioners have a structure in which a resin tank is provided at both ends of a heat transfer tube through which a heat exchange fluid passes, and this tank is equipped with a pipe for introducing or discharging the heat exchange fluid. . Since the tank and pipe are made of resin, it is easy to make them into one piece, but in order to allow the tank to be shared even if the pipe shape changes depending on the car model,
In some cases, the two are separate pieces and joined together during assembly. As a conventional joint structure, for example, in Japanese Utility Model Application Publication No. 55-5135, a flange member is fixed to the pipe by welding, etc., and a bolt embedded and fixed on the tank side is inserted into the flange member and fastened with the bolt. . However, this structure not only requires a large number of man-hours such as welding flanges, embedding bolts, and tightening nuts, but also has the disadvantage of requiring a large number of parts, such as the need for a seal ring to seal between the pipe and tank. .

Therefore, an object of the present invention is to improve a structure in which a tank and a pipe are separated so that the number of parts at the joint between the two can be reduced and the number of assembly steps can be reduced.

The following description will be given with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes heat transfer tubes made of aluminum, and a large number of them are arranged side by side. Heat exchanger tube 1 and fins 2
are thermally coupled (see Figure 4). The heat exchanger tube 1 is fixed to sheet metals 3 and 4 at both ends. Resin tanks 6 and 7 are airtightly fixed on the sheet metals 3 and 4 via seals 8. The heat exchanger tube 1 is open to the space formed by the insides of the tanks 6 and 7. The space of the upper tank 6 is divided into two parts by a partition 9, and a heat exchange fluid introduction pipe 10 is fixed to one side, and a heat exchange fluid discharge pipe 11 is fixed to the other side. The fluid introduced into the tank 6 from the pipe 10 enters one space divided by the partition 9, then enters the lower tank 7 via the heat exchange pipe 1 that opens into this space, and from there it is heated again. Exchange tube 1
It enters the other space partitioned by the partition 9 through the pipe 11 and is taken out from the pipe 11. At this time, heat exchange is performed between the fins 2 and the air in contact with them.

According to the present invention, the pipes 10 and 11 are made of resin and are formed separately from the tank 6, and are joined as follows. That is, as shown in FIG.
A flange portion 30 is formed at the lower end of tank 10 (or 11), while an annular raised portion 3 is formed on the upper surface of tank 10.
2 is formed. The flange portion 30 has two concentric ring groove portions 301 and 30 having a U-shaped cross section on its lower surface.
2 (see FIG. 5), and an annular joining protrusion 302 is formed therebetween, and this protrusion is located slightly recessed from the bottom surface C of the flange portion 30.
On the other hand, an annular joining protrusion 32 is provided on the annular raised portion 32.
1 (FIG. 4), the width of this protrusion 321 is made equal to the aforementioned protrusion 302, and the protrusion 321
The height of the upper surface D is the height of the flange portion 30 of the tank 1.
It is selected so that it contacts the lower surface C of the apex protrusion 302 when placed on the raised portion 32 of No. 0 (FIG. 6). As a result, two concentric closed annular internal spaces 34 and 36 are formed around the joint surfaces formed by the protrusions 302 and 321, as shown in FIG. In the present invention, this joint surface CD is welded together by ultrasonic vibration welding or the like to join the tank 3 and the pipe 10 or 11. During this welding, the resin flows out in a molten form from the joint surface, but since the void spaces 34 and 36 are formed along the joint surface, the flowed resin is captured here as shown in p and escapes to the outside. It won't fall off. Since the joint surface C-D is parallel to the top surface of the tank, the pipe can be attached even at the final stage of the assembly process.

The resin is phenol-added nylon 66.
It is preferable because it can suppress the damage caused by LLC liquid compared to the conventional nylon 66 alone and can have a long service life. According to tests, when left at 120℃, it can last for more than 1,000 hours, compared to the conventional 110 hours.

Although the grooves 301 and 302 provided in the flange 30 are U-shaped in the figure, they may have any other shape.

As mentioned above, in this invention, the tank and pipe are welded together, which results in a joint structure with good sealing performance even though there are fewer parts compared to conventional mechanical systems, reducing costs and man-hours. . In addition, since a confined space is formed inside the pipe along the joint surface as an escape for the melted resin that occurs during welding, the melted resin is prevented from protruding to the outside, and the joint is unnoticeable, resulting in a good appearance. Can be maintained. In addition, the molten material filling the spaces 34 and 36 becomes integrated with the joint after solidification, and can contribute to improving the strength of the joint.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the heat exchanger of the present invention;
Figure 2 is a top view of the tank, Figure 3 is a side view of the tank, Figure 4 is a sectional view of the joint between the pipe and tank, Figure 5 is an enlarged sectional view of the flange of the pipe, and Figure 6 is an enlarged sectional view of the flange of the pipe. The figure is an enlarged sectional view of the joint between the pipe flange and the annular protrusion of the tank. 1... Heat exchanger tube, 6... Tank, 10, 11...
Pipe, 30... flange portion, 32... annular protrusion, 34, 36... escape space.

Claims (1)

[Scope of utility model registration request] A resin tank is provided at the open end of the heat exchanger tube through which the heat exchange fluid flows, and a resin pipe for introducing or discharging the heat exchange fluid is separately provided in the tank,
The flange at one end of the pipe and the annular raised part of the tank are welded together by vibration welding, etc., and an annular inner and outer relief closed to the outside is formed along the annular joint surface between the flange part and the annular raised part. A heat exchanger in which a space is formed, and a molten resin flow generated during welding escapes into the escape space.