JPS59107195A - Method for manufacturing synthetic resin tank - Google Patents

Abstract

PURPOSE:To maintain a jointing strength between a tank and a seat plate, by arranging such that the recess of periphery of tank seat plate has a cross-sectional area larger than that of metallic line received therein, and the lower end of the tank is provided with a projection having the cross-sectional area equivalent to the difference of above two cross-sectional areas. CONSTITUTION:A high frequency induction coil 11a provided around the periphery of seat plate 2 is energized for producing an induction current in a metallic wire 10 under an arrangement such that the metallic wire 10 is received in a recess 9 defined in the peripheral upper surface of seat plate 2, the projecting piece 12 of lower end surface 1b of tank is inserted into the recess 9 until it abuts against the metallic wire 10, and the tank 1 and the seat plate 2 are pressed each other. In this manner, the metallic wire 10 serves to fuse the inner surface of recess 9, while at the same time fusing the projecting piece 12 from the lower end thereof. As a result, the recess 9 is filled with a resin melted out of the projecting piece 12 to mix with another resin fused from the interior of recess 9. In consequence, the tank 1 and the seat plate 2 are favorably joined together in a wide area after being cooled down. Thus, a heat exchanger is obtained which is free from leaky water and durable as well.

Description

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

(Background technology) Conventionally, heat exchangers with synthetic resin tanks have
It was assembled as shown in the figure. That is, when the seat plate is also made of synthetic resin, as shown in FIG. A metal liquid passage tube 3 is inserted through the backing 4 in a fluid-tight manner. If the seat plate 2 is made of metal, as shown in FIG. 2, the end of the liquid pipe 3 is passed through the seat plate 2, and the penetrating portion is soldered in a liquid-tight manner.

The flange 1a at the lower end of the tank l is placed on the banking 7 attached to the groove formed around the seat plate 2, and this flange l
A and the peripheral edge of the seat plate 2 are joined together via a backing 7 which is elastically compressed by a metal fitting 8, and the tank 1 and the seat plate 2 are connected.
and were joined in a liquid-tight manner. 6 is a fin attached to the liquid passage pipe 3.

However, manufacturing a heat exchanger with a synthetic resin tank as described above is cumbersome and difficult to manufacture, as the work of joining the tank to the seat plate and the work of joining the fluid pipes must be done separately. It was also a cause of high prices.

In order to eliminate such inconveniences, the present inventor first developed a synthetic resin tank that can simultaneously bond the tank and seat plate and the seat plate and the liquid passage pipe using high-frequency induction heating. Invented a method for manufacturing a heat exchanger with
No. 25). To briefly explain this gap in the third drawing, a groove 9 is formed by aligning the lower end surface 1b of the tank l and the upper surface of the peripheral edge of the seat plate 2, and forming the entire circumference on one of both surfaces. A metal wire 10 was fitted into the seat plate 2, and the end of the metal liquid passage pipe 3 was passed through the hole 5 drilled in the seat plate 2 without a gap, and the metal wire 10 was placed near the liquid passage pipe 3. By energizing the high frequency induction coils 11 and lla, 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 passage J&t'3 is joined to the seat plate 2.

However, this method of manufacturing a heat exchanger having a synthetic resin tank still has the following drawbacks. That is, the groove 9 formed on one of the lower end surface ib of the tank 1 and the upper surface of the peripheral edge of the seat plate 2 is large enough to fit the metal wire 10, and this groove 9
Since the surface facing the metal wire 10 is simply flat, when welding the tank 1 and the seat plate 2 by high-frequency induction heating of the metal wire 10, the heat generated by the metal wire 10 is generated at the peripheral edge of the metal wire 10. Welding is performed only in the limited affected areas, and the strength of the joint is insufficient due to the lack of welding area.

(Objective of the present invention) The present invention eliminates the drawbacks of the prior art as described above, and provides a synthetic resin tank that can sufficiently secure the strength of the joint between the tank and the seat plate by high-frequency induction heating. The object of the present invention is to provide a method for manufacturing a heat exchanger.

(Structure of the present invention) The method of manufacturing a heat exchanger having a synthetic resin tank of the present invention is based on the method of manufacturing a heat exchanger having a synthetic resin tank configured as described above. The cross-sectional area of 11η formed on the lower end surface or the upper surface of the peripheral edge of the seat plate is made sufficiently larger than the cross-sectional area of the metal wire so that this metal wire can be inserted loosely, and A protrusion having a cross-sectional area equal to the difference between the cross-sectional area of the groove and the cross-sectional area of the metal wire is formed in a portion of the lower end face facing the groove. When joining the tank and seat plate, insert a metal wire into the groove, bring the protrusion into contact with the metal wire, press the tank and seat plate together, and energize the high-frequency induction coil. When heated, the inner surface of the groove and the ridges melt and mix together, joining the tank over a wide area such as 1+41M or 1-min.

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

FIG. 4 is an enlarged sectional view corresponding to section A in FIG. 3, showing an embodiment of the present invention. Lower end surface 1 of synthetic resin tank l
A protrusion 12 having a rectangular cross section with a width W and a height H is formed at the center of b. On the other hand, the upper surface of the peripheral edge of the seat plate 2 made of the same material as the tank 1 has a width slightly smaller than the width W of the protrusion 12 (0,
A groove 9 having a rectangular cross section with a wide width W and a depth D is formed. The thickness T of the walls 13.13 forming both sides of this groove 9 is formed to be 1.5+n/m or more (T≧1.5 m/m). The groove 9 is made of a ferromagnetic metal such as iron (Fe), nickel (Ni), or an alloy thereof, and has a diameter R of about % of the width W of the groove 9 (R=3W). /4) Metal wire 10 is inserted. Here, the size of each component is tank 1
The dimensions w,
H, W, D, and R are determined to satisfy the following relational expression.

w X H= W , insert the protrusion 12 on the lower end surface ib of the tank into this groove 9 until it contacts the metal wire 1o, and with the tank 1 and the seat plate 2 pressed against each other, press around the seat plate as shown in FIG. The high-frequency induction coil lla provided in
The inner surface of the ill 9 is melted, and the protrusion 12 is melted from the lower end. Therefore, the resin eluted from the protrusion 12 fills the groove 9 and mixes with the resin eluted from the inner surface of the groove 9, and after cooling, the tank 1 and the seat plate 2 are well bonded over a wide area. be done. Furthermore, if the size of the protrusion 12 is slightly larger than the case where the above-mentioned relational expression is satisfied, a part of the eluted resin will also penetrate between the tank lower end surface ib and the upper surface of the wall 13.13. However, since both sides are also bonded, the bonding strength is further improved.

(Application example) When carrying out the method of manufacturing a heat exchanger having a synthetic resin tank of the present invention, the surface of the metal wire 10 and the protrusion 1 are prepared in advance.
2. On the lid surface of No. 2, crosslinkable nylon 12 type (for example, Toagosei Chemical Industry Co., Ltd. product name: FS-175SN, etc.)
If a hot water-resistant adhesive such as phenolic nitrile adhesive (for example, Bostic Japan Acid, trade name: 1755.2300S, etc.) is applied, the bonding strength between the tank 1 and the seat plate 2 will be further improved. That is, after joining the tank 1 and the seat plate 2, the strength of the joint before the hot water treatment is equal to that of the base material (for example, nylon) by subjecting it to hot water treatment or applying the adhesive described above. Furthermore, even after treatment, water penetration into the welding interface between the surface of the metal wire 10 and the resin is prevented, and sufficient welding strength, liquid richness, and pressure resistance are achieved. As a result, the durability of the heat exchanger manufactured by the method of the present invention is further improved.

(Effects of the present invention) As described above, the method of manufacturing a heat exchanger having a synthetic resin tank according to the present invention allows the tank 1 and the seat plate 2 to be joined for a little more than 1 minute [υ]. It is possible to obtain a heat exchanger that is unlikely to cause leakage failures and has excellent durability.

[Brief explanation of drawings]

Figures 1 and 2 are partial longitudinal side views showing two examples of heat exchangers having synthetic resin tanks made by the conventional method, and Figure 3 is a heat exchanger having a synthetic resin tank by the method of the previous invention. FIG. 4 is a longitudinal sectional side view similar to FIG. It is an enlarged sectional view corresponding to part A. ■・Tank, 1a: flange, lb: lower end surface, 2 seat plate, 3: liquid pipe, 4: backing, 5 hole, 6, fin, 7
Backing, 8: Holder, 9, Groove, 10 Metal wire,
11.11a: High frequency induction coil, 12: Projection, 13:
wall. Patent applicant: Japan Radiator Co., Ltd. Agent
Kinzo Koyama (and 1 other person) Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] 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 wire (10 ),
Insert a metal liquid pipe (3) into the hole (5) drilled in the seat plate (2).
A high-frequency induction coil (11) is installed near the metal wire (10) and the liquid pipe (3), with the end of the coil passed through the j without a gap.
By applying electricity to (l l a), the metal wire (10) and the liquid pipe (3) are made to generate heat, and the tank (1) and seat plate (2) are heated.
In the method for manufacturing a heat exchanger having a synthetic resin tank that simultaneously welds the seat plate (2) and the liquid passage pipe (3), the cross-sectional area of the groove (9) is ), and the width of the groove (9) is larger than the diameter of the metal wire (io), and the surface facing the surface on which the groove (9) is formed has a 1; ) and the cross-sectional area of the metal wire (10
) has a cross-sectional area equal to the difference from the cross-sectional area of (12)
A heat exchanger for encasing a synthetic resin tank, characterized in that the tank (1) and the seat plate (2) are pressed together while energizing the high frequency induction coil (11) ('11a). Production method.