JPS6339838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method and apparatus for manufacturing a heat exchanger having a synthetic resin tank, such as a radiator for an automobile.

(Background technology) Conventionally, a heat exchanger having a synthetic resin tank is
It was assembled as shown in Figures 1-2. That is, if the seat plate is also made of synthetic resin, the lower end surface of the tank 1 and the seat plate 2 are welded together watertightly by ultrasonic welding or friction welding, and a hole is formed in the seat plate 2, as shown in Fig. 1. A metal liquid passage pipe 3 is inserted into the hole 5 through the packing 4 in a fluid-tight manner. If the seat plate 2 is made of metal, as shown in FIG. The flange 1a of the lower end of the tank 1 is placed on the packing 7 attached to the groove formed around the flange 1a, and the packing 7 is elastically compressed by the metal fitting 8 that holds the flange 1a and the peripheral edge of the seat plate 2.
The tank 1 and the seat plate 2 were connected in a liquid-tight manner. Reference numeral 6 denotes a fin attached to the liquid passage pipe 3.

However, manufacturing a heat exchanger having a synthetic resin tank as described above requires laborious caulking of the retaining fittings 8, or the use of relatively expensive packings 4 and 7, which increases the product price. It was also the cause of the high

In order to eliminate such inconveniences, the present inventor first used high-frequency induction heating to easily join the tank and the seat plate and the seat plate and the liquid passage pipe without using packing. Invented a method for manufacturing a heat exchanger with a synthetic resin tank (patent application 1982-
No. 34025). To briefly explain the present invention with reference to FIG. 3, the lower end surface 1b of the tank 1 and the upper surface of the peripheral edge of the seat plate 2 are overlapped, and a metal groove 9 is formed on one of both surfaces over the entire circumference. A high-frequency induction coil is installed near the metal wire 10 and the liquid passage pipe 3 by inserting the wire 10 into the hole 5 drilled in the seat plate 2 and passing the end of the metal liquid passage pipe 3 without a gap. By energizing 11 and 11a, the metal wire 10
The tank 1 and the seat plate 2 are welded together by generating heat in the tank 1 and the liquid passage pipe 3, and at the same time, the seat plate 2 and the liquid passage pipe 3 are joined together.

However, in the method for manufacturing a heat exchanger having a synthetic resin tank according to the prior invention,
However, there were still some shortcomings as described below. That is, since the liquid passage pipe 3 constituting the heat exchanger uses a non-magnetic metal such as copper, brass, or aluminum as a material with good heat conductivity, the high-frequency induction coil 11
Even if the coil 11 is energized, it is difficult to generate an induced current in the liquid passage tube 3, and in order to join the end of the liquid passage tube 3 and the seat plate 2 in a liquid-tight manner, the coil 11 is heated for a long time (120 to 240 minutes).
seconds), which not only increases power consumption but also increases the time required to manufacture the heat exchanger. On the other hand, the metal wire 10 interposed at the joint between the tank 1 and the seat plate 2 is made of a ferromagnetic metal such as iron, nickel, or an alloy thereof. It is sufficient to energize the high frequency induction coil 11a for a short time (5 to 10 seconds), and the tank 1
Due to the difference between the time required to join the liquid passage pipe 3 and the time required to join the liquid passage pipe 3,
The manufacturing process will not run smoothly. Furthermore, since the high-frequency induction coil 11 is provided to generate heat in the liquid passage pipe 3, it is not possible to provide the fins 6 in the part of the liquid passage pipe 3 near the seat plate 2, and the heat exchanger has a reduced heat dissipation area. Performance will deteriorate.

(Objective of the present invention) The present invention solves any of the above-mentioned disadvantages,
A synthetic resin tank that can quickly connect a non-magnetic metal liquid passage pipe and a synthetic resin seat plate with low power consumption, and also allows the liquid passage pipe to have fins close to the seat plate. It is an object of the present invention to provide a method and apparatus for manufacturing a heat exchanger having the following.

(Structures of the present invention) a Structure of the manufacturing method invention (specified invention) The manufacturing method of a heat exchanger having a synthetic resin tank of the present invention includes, before joining the tank to the seat plate,
First, the end of the liquid passage pipe is joined to the seat plate.A heating pin made of ferromagnetic metal is press-fitted from the open end of the liquid passage pipe, and this heating pin is heated by high-frequency induction heating to connect the seat plate to the seat plate. After the end of the liquid passage pipe inserted into the hole is liquid-tightly joined to the seat plate, the heating pin is cooled and then pulled out from inside the liquid passage pipe, and then the tank is joined to the seat plate.

b. Invention of manufacturing device The manufacturing device of a heat exchanger having a synthetic resin tank according to the present invention is capable of pressing a liquid passage pipe from both ends.
A large number of heating pins made of ferromagnetic metal are installed on the pressing surface of at least one of the pair of pressing plates through a freely cooling mounting plate in accordance with the arrangement of the liquid passage pipes. A high-frequency induction coil is placed near the heating pin.

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

4 and 5 show an embodiment of the manufacturing apparatus of the present invention, FIG. 4 is a plan view of the push plate 13 on which the heating pins 12, 12 are installed, and FIG. FIG. A mounting plate 15 made of metal such as stainless steel and provided with a water passage 14 for circulating cooling water is fixed to the top surface of the push plate 13. A large number of heating pins 12, 12 are installed in alignment with the liquid passage pipes forming the core portion of the heat exchanger. The upper end portion of each heating pin 12, 12 is tapered into a conical shape, and the diameter of the upper end of this tapered portion is slightly smaller than the inner diameter of the liquid passage pipe.
The diameter of the lower end is larger than the inner diameter of the liquid passage tube. Between the large number of heating pins 12, 12 planted on the top surface of the mounting plate 15 in this way, high-frequency induction A coil 17 is stretched. Therefore, when the high-frequency induction coil 17 is energized, an induced current is induced in the heating pin 12 and the heating pin 12 generates heat. , the heating pin 12 is cooled.

When the metal liquid passage pipe and the synthetic resin seat plate constituting the heat exchanger are liquid-tightly joined using such a push plate 13, another press plate that presses the other end of the liquid passage pipe 3 and one
Use as a pair. That is, as shown in FIG.
A liquid passage pipe 3 is attached to the heating pins 12, 12 on the upper surface of the push plate 13, and constitutes the core part of the heat exchanger together with the fins 6, 6, and the end thereof is inserted into the holes 5, 5 of the seat plate 2 made of synthetic resin. The lower end openings of the liquid passage pipes 3, 3 are arranged to face each other.
3 is pressed downward by another press plate 18.
As a result, the tapered portions of the upper ends of the heating pins 12, 12 are fitted into the lower ends of each of the liquid passage pipes 3, 3. In this way, each heating pin 12, 12
If it is fitted inside the lower end of both push plates 13, 18
heating pins 12, while pressing them toward each other.
The high-frequency induction coil 17 disposed along the heating pin 12 is energized to induce an induced current in each of the heating pins 12, 12, thereby causing the heating pins 12, 12 to generate heat. a liquid passage pipe 3 into which heating pins 12, 12 are fitted;
3 is made of a metal with good heat conductivity, such as aluminum or copper, as described above, so the heat from these heating pins 12, 12 is immediately transmitted to the outer peripheral surface of the liquid passage pipes 3, 3, and this Seat plate 2 in contact with the outer peripheral surface
The synthetic resin on the inner peripheral surface of the hole 5 is melted. When the synthetic resin on the inner peripheral surface of the hole 5 is completely melted and the seat plate 2 and the liquid passage pipe 3 are welded together, the high frequency induction coil 17
After stopping the power supply to the upper and lower push plates 1 and sending cooling water into the water passage 14 in the mounting plate 15 to cool the heating pins 12, 12 through the mounting plate 15,
3, 18 in the direction away from the seat plate 2, take out the liquid passage tubes 3, 3 and the fins 6, 6 which have been welded to the seat plate 2, turn them upside down, and place the liquid passage tubes 3, 3 on the opposite end as well. Weld plate 2. However, the upper and lower press plates 13,1
By providing the heating pins 12, 12 on both of the liquid passage pipes 3, 8, it is possible to simultaneously perform the work of welding the seat plate 2 to the upper and lower ends of the liquid passage pipes 3, 3.

After the seat plates 2, 2 are welded to both ends of the liquid pipes 3, 3 in a liquid-tight manner in this way, they are sent to another process.
Appropriate method (high frequency induction heating method,
Synthetic resin tanks are joined using ultrasonic heating, etc., and the heat exchanger is completed.

In order to further improve the bonding strength between the liquid passage pipes 3, 3 and the seat plate 2, sandblasting is performed before inserting the ends of the liquid passage pipes 3, 3 into the holes 5, 5 of the seat plate 2. After cleaning, apply a primer (for example, Toagosei Chemical Co., Ltd. product name: S-10, S
-20, etc.), cross-linkable nylon 12-based hot water-resistant adhesives (for example, Toagosei Kagaku Kogyo Co., Ltd., trade name: FS-175SN, etc.), or phenolic nitrile-based hot water-resistant adhesives (for example, It is effective to apply a product (product name: 1755, 2300S, etc., manufactured by Boschak Japan Co., Ltd.).

In addition, in order to cool down the heating pins 12 more quickly after welding is completed, each heating pin 1
Heat pipes may be embedded inside the heat pipes 2 and 12, and the ends of each heat pipe may directly contact the cooling water in the passageway 14 only during cooling.

(Effects of the present invention) The method and apparatus for manufacturing a heat exchanger having a tank made of synthetic resin according to the present invention is configured and operates as described above, so that Bonding with the seat plate can be done in a short time and with less power consumption.

According to experiments conducted by the present inventor, when an aluminum liquid passage pipe and a nylon seat plate reinforced with glass fiber are joined by the method according to the previous invention shown in FIG. When a current of 10KV and 1A is passed through the high frequency induction coil while applying a pressure of ² ,
While it took 180 to 200 seconds to complete the bonding, the method and apparatus of the present invention completed the bonding in 10 seconds under the same conditions.

Furthermore, the heating pin for heating the end of the liquid passage tube is inserted through the end opening of each liquid passage tube, and there is no need to provide a high frequency induction coil between the seat plate and the fin. It can be provided close to the seat plate, and a sufficient area for heat exchange can be secured to improve the performance of the heat exchanger.

[Brief explanation of the drawing]

Figures 1 and 2 are partially longitudinal side views showing two examples of heat exchangers with synthetic resin tanks made by the conventional method, and Figure 3 shows a radiator with a synthetic resin tank made by the method of the previous invention. 1 and 2 are partially longitudinal side views similar to those shown in FIGS. 1 and 2 showing the manufacturing state, and FIGS. 4 and 5 show an embodiment of the manufacturing apparatus of the present invention. FIG. A sectional view taken along the line A-A in the figure, and FIG. 6 are partial longitudinal sectional views showing a state in which a heat exchanger is manufactured by this manufacturing apparatus. 1: Tank, 1a: Flange, 1b: Lower end surface,
2: Seat plate, 3: Liquid pipe, 4: Packing, 5:
Hole, 6: Fin, 7: Packing, 8: Holder, 9: Groove, 10: Metal wire, 11, 11a: High frequency induction coil, 12: Heating pin, 13: Push plate, 1
4: Water passage, 15: Mounting plate, 16: Support plate, 1
7: High frequency induction coil, 18: Push plate.

Claims (1)

[Claims] 1. Liquid flow pipes 3, 3 and fins 6, 6 made of non-magnetic metal.
After assembling and forming a core part, and inserting the ends of each liquid passage pipe 3, 3 into the holes 5, 5 of the seat plate 2 made of synthetic resin,
Heating pins 12, 12 are fitted into the ends of each liquid passage tube 3, 3, and the heating pins 12, 12 are heated by high-frequency induction heating to heat the ends of each liquid passage tube 3, 3. This end is liquid-tightly welded to a seat plate 2 made of synthetic resin, and after cooling the heating pins 12, 12 and pulling them out from inside the liquid passage pipes 3, 3, a tank made of synthetic resin is attached to the seat plate 2. 1. A method for manufacturing a heat exchanger having a synthetic resin tank joined together. 2 At least one of the pair of push plates 13 and 18 that presses from both end surfaces the large number of non-magnetic metal liquid passage tubes 3, 3 that constitute the core part of the heat exchanger together with the fins 6, 6. A mounting plate 15 that can be freely cooled is provided on a surface opposite to the end surfaces of the liquid passage pipes 3 and 3 of No. 13.
Heating pins 12, 12 made of ferromagnetic metal with tapered ends are installed in the same number and arrangement as the liquid passage pipes 3, 3, and a high frequency induction coil 17 is installed near the heating pins 12, 12. A heat exchanger manufacturing device having a synthetic resin tank.