JPH0143219Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a device for joining a synthetic resin seat plate and a metal liquid passage pipe constituting a heat exchanger such as an automobile radiator.

(Background Art) Conventionally, a heat exchanger having a seat plate made of synthetic resin has been assembled as shown in FIG. That is, the lower end surface of a tank 1 made of synthetic resin and a seat plate 2 are welded together watertightly by ultrasonic welding or friction welding, and a metal liquid is passed through a hole 5 drilled in the seat plate 2 through a packing 4. Insert the tube 3 in a fluid-tight manner.

However, in this way, the seat plate 2 made of synthetic resin
When joining the liquid passage pipe 3 made of metal to the metal liquid passage pipe 3, a relatively expensive packing 4 is used, which increases the price of the product. If the diameter of the end of the liquid passage pipe 3 is increased in order to increase the diameter, unreasonable stress is likely to be applied to a portion of the packing 4, and water leakage failure due to tearing of the packing 4 is likely to occur.

In order to eliminate these inconveniences, the present inventors first developed a method that uses high-frequency induction heating to easily join a synthetic resin seat plate and a metal liquid passage pipe without using packing. Invented a device directly used for carrying out the method (Patent application No. 57-218399)
No.). Firstly, the present invention will be explained with reference to FIGS. 2 to 4. The method of joining a synthetic resin seat plate and a metal liquid passage tube is to A heating pin made of a ferromagnetic metal material is press-fitted into the open end of the liquid passage pipe 3, and this heating pin is made to generate heat by high-frequency induction heating to heat the end of the liquid passage pipe inserted into the hole in the seat plate. After being liquid-tightly joined to the seat plate, the heating pin is cooled and then pulled out from the liquid passage pipe. Also,
The device used to carry out this method is a pair of press plates 7 and 8 that can press the liquid pipe 3 from both ends, and a cooling-free mounting plate 9 is attached to the pressing surface of at least one of the press plates 7. A large number of heating pins 10, 10 made of ferromagnetic metal material are installed in accordance with the arrangement of the liquid passage pipes,
A high frequency induction coil 11 is disposed near this heating pin. Reference numeral 12 denotes a passage through which a refrigerant (water may be used) for cooling the mounting plate 9 flows. The end of each heating pin 10, 10 is tapered into a conical shape, and the diameter of the end surface of this tapered part is slightly smaller than the inner diameter of the liquid passage tube 3, and the diameter of the end face of this tapered part is slightly smaller than the inner diameter of the liquid passage pipe 3, and the diameter of the end face of this tapered part is slightly smaller than the inner diameter of the liquid passage pipe 3, and the diameter of the end face of this tapered part is slightly smaller than the inner diameter of the liquid passage pipe 3. Each heating pin 10, 10 is formed so that its diameter is larger than the inner diameter of the liquid passage pipe 3. Further, the high frequency induction coil 11 is mounted on the mounting plate 9
Support plates 13 made of insulating material are installed at both ends of the upper surface of the
13 and arranged as shown in FIGS.

However, in the device configured as described above for joining the synthetic resin seat plate and the metal liquid passage pipe, temperature unevenness tends to occur in the large number of heating pins 10, 10, making it difficult to perform good joining. There were flaws. That is, the heating pins 10, 10 are connected to the high frequency induction coil 11.
The closer it is to the heating pins, the easier it is to heat up, and the farther away it is, the heat generation will be poor. Therefore, the placement position of the coil 11 is slightly adjusted so that each heating pin 10, 10 is heated evenly, but the temperature distribution is sufficiently uniform. It was difficult to do so, and the strength of the joint between the seat plate and the liquid pipe was likely to vary.

(Purpose of the present invention) The present invention eliminates the above-mentioned disadvantages, can heat a large number of heating pins almost evenly, and does not cause variations in the bonding strength between the seat plate and the liquid passage pipe. The object of the present invention is to provide a device for joining a synthetic resin seat plate of a heat exchanger and a metal liquid passage pipe.

(Structure of the present invention) The device for joining the synthetic resin seat plate of the heat exchanger and the metal liquid passage pipe of the present invention is provided with at least one of a pair of push plates that can press the liquid passage pipe from both ends. A large number of heating pins are installed on the pressing surface of the press plate through a freely cooling mounting plate in accordance with the arrangement of the liquid passage tubes, and whose ends can be press-fitted into the end openings of the liquid passage tubes. High-frequency induction coils are arranged in two stages near the heating pin, and current flows in the same direction through the two stages of high-frequency induction coils.

(Embodiments of the present invention) Next, the present invention will be explained in more detail while explaining the illustrated embodiments.

5 and 6 show a first embodiment of the present invention. A large number of heating pins 10, 10 made of ferromagnetic metal are mounted on a mounting plate 9 fixed to the pressing surface of the pressing plate 7 so as to be able to swing slightly in accordance with the arrangement of the liquid passage pipes. High frequency induction coils 11 are arranged in two stages, upper and lower, between the heating pins 10, 10. (5th
In the figure, the upper row of the coil is drawn by a solid line, and the lower row is drawn by a broken line. ) The high-frequency induction coils 11 in the upper and lower two stages are constructed so that the current flows in the same direction in the upper and lower stages, so that the current flows further outward than the outermost heating pins 10, 10. Dummy coil portions 11a, 11a are provided.

In this way, the high-frequency induction coils 11 are disposed in two stages, upper and lower, near the heating pins 10, 10, and the structure is such that the induced current flows in the same direction through the upper and lower coils. A substantially uniform high-frequency induced current flows inside the heating pin 11, and each heating pin 10, 10 comes to be heated substantially uniformly. According to experiments conducted by the present inventor, heating pins 10, 10 and high frequency induction coil 11 are arranged as shown in FIGS.
By appropriately adjusting the distance between the high frequency induction coil and the heating pins 10, 10, the heating pins 10, 10 can be
When heated to a temperature of about 10°C, the temperature difference between the highest temperature heating pin and the lowest temperature heating pin was only about 10°C (compared to about 50°C in the past). A temperature difference of this degree poses no problem in practice.

Note that dummy pins 14, 14 are provided in a portion surrounded by the dummy coil portion 11a further outside the outermost heating pins 10, 10, and the heating pins 10, 1
If the dummy pins 14, 14 are also heated when the heating pin 10 is heated, the surrounding conditions of the outer heating pin and the inner heating pin are the same, and each heating pin 10,
10 can be further reduced.
However, such dummy pins 14, 14 are placed in the heating pins 10, 14 so that they do not get in the way when the heating pins 10, 10 are press-fitted into the liquid passage tubes 3, 3 (FIG. 2).
Form lower than 10.

Next, FIG. 7 shows a second embodiment of the present invention. In this embodiment, the high frequency induction coil 11
are arranged in a meandering manner as if threading between a large number of heating pins 10, 10. Moreover, all four circumferences of the large number of heating pins 10, 10 are surrounded by dummy pins 14, 14. In this embodiment as well, current flows in the same direction in the upper part of the coil shown by the solid line and the lower part shown by the chain line, so that the heating pins 10, 10 are uniformly heated.

(Effects of the present invention) Since the device for joining the synthetic resin seat plate and the metal liquid passage pipe of the heat exchanger of the present invention is constructed as described above, the numerous heating pins can be heated almost uniformly. Therefore, the synthetic resin seat plate and the metal liquid passage pipe can be bonded well.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the joint between a conventional synthetic resin seat plate and a metal liquid passage pipe, Figs. 2 to 4 show the device according to the earlier invention, and Fig. 2 shows the state of use. 3 is a plan view, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIGS. 5 and 6 show the first embodiment of the present invention, and FIG. , Figure 6 is the fifth
FIG. 7 is a sectional view taken along line BB in the figure, and a plan view showing the second embodiment. 1: Tank, 2: Seat plate, 3: Liquid pipe, 4: Packing, 5: Hole, 6: Fin, 7, 8: Push plate,
9: Mounting plate, 10: Heating pin, 11: High frequency induction coil, 11a: Dummy coil section, 12: Passage,
13: Support plate, 14: Dummy pin.

Claims (1)

[Scope of utility model registration request] Of a pair of press plates that can press metal liquid passage pipes from both ends, a large number of plates are planted on the pressing surface of at least one of the press plates in accordance with the arrangement of the liquid passage pipes via a freely cooling mounting plate. In a device for joining a metal fluid pipe to a synthetic resin seat plate of a heat exchanger in which a high frequency induction coil is disposed near a heating pin made of a ferromagnetic metal material, the high frequency induction coil is A device for joining a synthetic resin seat plate and a metal liquid passage pipe of a heat exchanger, characterized in that the heat exchanger is arranged in stages so that current flows in the same direction in the upper and lower stages.