JPH048716B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention is used as a heater core of an automobile heater or a radiator, etc., and a synthetic resin tank is fixed to each end of a core portion consisting of fins and a tube. The present invention relates to a method of manufacturing a heat exchanger in which one tank is divided into two at the center and fluid flows back and forth through the core.

(Background Art) As a heat exchanger used for the above-mentioned purpose, one having a structure as shown in FIG. 1 has been known. That is, an upper tank 5 and a lower tank 6 are fixed above and below a core part 3 consisting of a large number of liquid passage pipes 1, 1 and fins 2, 2 through metal seat plates 4, respectively. Tank 5 is in the center with 2 on the left and right
The right chamber 5a is provided with an inlet pipe 7, and the left chamber 5b is provided with an outlet pipe 8.

When a heat exchanger having such a structure is used, for example, as a heater core, when a heat medium (hot water) is sent from the inlet pipe 7 to the right chamber 5a of the upper tank 5, this heat medium flows into the right half of the core part 3. Liquid passage pipes 1, 1 that constitute the
The inside flows down towards the lower tank 6 as shown by arrow a, and the flow direction is changed within this lower tank 6, and the inside of the liquid passage pipes 1, 1 forming the left half of the core part 3 is shown by arrow b. It flows towards the left ventricle 5b of the upper tank 5,
It is then discharged from the outlet pipe 8. Therefore, when air is made to flow through the core section 3, this air flows through the liquid passage pipes 1, 1 and the fins 2, 2, which are heated by the heat medium.
The temperature rises when it comes into contact with the vehicle, which can be used to heat the interior of the vehicle.

In the heat exchanger constructed and operated as described above, the interior of the upper tank 5 has conventionally been divided into left and right halves by packing. That is, the upper surface of the central part of the upper tank 5 is constricted as shown in FIGS. 1 and 2 to form a hanging wall 9 facing the seat plate 4, and the space between the lower edge of this hanging wall 9 and the upper surface of the seat plate 4 is formed. Press the packing 10 with the right ventricle 5a and left ventricle 5b.
It separates the Reference numeral 11 denotes a rib formed on the upper surface of the upper tank 5 to reinforce the central constriction. However, in this way, Packing 1
When the inside of the upper tank 5 is divided into two parts by 0, not only is the division work troublesome, but it is also difficult to maintain complete watertightness between the right ventricle 5a and the left ventricle 5b. A part of the heat medium that has flowed in bypasses the core portion 3 and directly enters the left chamber 5b, reducing the efficiency of the heat exchanger.

(Objective of the present invention) The present invention solves the above-mentioned disadvantages, makes it easy to divide the tank, makes the space completely liquid-tight between the left and right chambers in the tank divided into two parts, and allows the heat exchanger to It is an object of the present invention to provide a method for manufacturing a heat exchanger having a synthetic resin tank that can improve the efficiency of the heat exchanger.

(Structure and operation of the present invention) In the method of manufacturing a heat exchanger having a synthetic resin tank of the present invention, the tank and the seat plate are made of the same synthetic resin, and the outer peripheral edge of the tank and the seat plate is and the middle part are fitted together, and a metal heating frame is provided in this fitting part, and a high frequency current is passed through this heating frame by high frequency induction heating method to generate heat in the heating frame, and the fitting part is heated. Melting the resin and joining the tank and seat plate in a liquid-tight manner,
This divides the inside of the tank into two.

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

FIG. 3 shows a synthetic resin tank 12 and a seat plate 13 used for carrying out the present invention. tank 12
A constriction part 14 is provided on the upper surface of the center part, and the lower surface of this constriction part 14 and the lower surface of the outer circumferential wall of the tank are located on the same plane so that each lower surface is continuous in a figure 8 shape, and the lower surface of the constriction part 14 is located in the same plane as the lower surface of the tank outer circumferential wall. ridges 15 are formed. No ribs are formed on the upper surface of the constricted portion 14 as in the conventional case. On the other hand, the upper surface of the seat plate 13 has the ends of the liquid passage pipes that are liquid-tightly joined together (for simplicity, the liquid passage pipes are omitted in the drawing). A concave groove 16 is formed into which the ridge 15 is fitted. Furthermore, as shown in FIG.
A heating frame 17 made of metal (iron is most preferable) and having the same shape and size as the ridge 15 on the lower surface of the tank is inserted.

Next, we will explain the procedure for joining the tank 12 and the seat plate 13 configured as described above and dividing the inside of the tank 12 into left and right chambers in a liquid-tight manner. First, as shown in FIG. The ridge 15 on the lower surface of the tank is fitted into the groove 16 on the upper surface of the seat plate. In this case, since the heating frame 17 has been inserted into the groove 16 in advance, the ridge 15 can only be inserted halfway into the groove 16, and the upper surface of the edge of the groove 16 and the tank 1
A gap 18 is formed between the lower surface and the lower surface. In this state, while pressing the tank 12 and the seat plate 13 against each other, the outer circumference of the seat plate 13 and the constriction 1
The high-frequency induction coil 19 located on the top surface of 4 is energized. As a result, the heating frame 1 at the bottom of the groove 16
A high frequency induced current is generated in the heating frame 17, and the heating frame 17 generates heat. Due to this heat generation, the resin forming the inner surface of the groove 16 and the resin below the ridge 15 melt and mix with each other, and after cooling, the tank 12 and the seat plate 13 are liquid-tightly joined, and at the same time the inside of the tank is Divide into two chambers, left and right. Note that the molten resin fills the groove 16 on the top surface of the seat plate and then enters the gap 18, so after joining, the tank 12 and the seat plate 1
There is no gap between both members 1 and 3.
The strength of the joints 2 and 13 is maintained, and the joints become beautiful.

In addition, in the above explanation, an example was described in which the tank to be divided into two is the upper tank, and the ridges 15 are formed on the tank side and the grooves 16 are formed on the seat plate side. It is not limited to a tank, but may be a lower tank or one tank in a cross-flow heat exchanger, and the ridges 15 may be formed on the seat plate side and the grooves 16 may be formed on the tank side.

(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 and the seat plate to be easily joined, and at the same time, the inside of the tank can be completely sealed. Since it can be divided into two parts in a liquid-tight state, the heat exchanger can be manufactured efficiently and a heat exchanger with excellent performance can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a heat exchanger to which the present invention is applied, Fig. 2 is an enlarged cross-sectional view of section A in Fig. 1 showing the divided structure of a conventional heat exchanger, and Fig. 3 is a main view of the present invention. A sectional view showing the tank and seat plate of a heat exchanger manufactured by the method of the invention, FIG. 4 is a plan view of the heating frame, and FIG. 5 is a partially enlarged cross section showing the state when the tank and the seat plate are joined. It is a diagram. 1: Liquid passage pipe, 2: Fin, 3: Core part, 4: Seat plate, 5: Upper tank, 5a: Right ventricle, 5b: Left ventricle,
6: lower tank, 7: inlet pipe, 8: outlet pipe, 9: hanging wall, 10: packing, 11: rib, 12: tank, 13: seat plate, 14: constriction, 15: ridge, 16: recess Groove, 17: Heating frame, 18: Gap, 1
9: High frequency induction coil.

Claims (1)

[Claims] 1 Synthetic resin tanks are joined to both ends of the core part 3 consisting of a large number of liquid passage pipes 1, 1 and fins 2, 2 via seat plates, and one tank is divided into two at the center. In the method of manufacturing a heat exchanger, one of the tanks 12 has a constricted portion 14 formed on the upper surface of the central portion, and the lower surface of the constricted portion and the lower surface of the outer peripheral wall are located on the same plane. A figure-8 shaped ridge 15 is formed on one side of the tank 12 and the upper surface of a seat plate 13 made of the same synthetic resin, and a groove 16 into which this ridge 15 fits is formed on the other side.
With the metal heating frame 17 inserted into the groove 16, the ridge 15 is fitted into the groove 16, and the high frequency induction coil 19 provided near the seat plate and tank is energized to close the heating frame. 17 to generate heat, tank 12
A method for manufacturing a heat exchanger having a synthetic resin tank, characterized in that the tank 12 and the seat plate 13 are welded and joined, and at the same time, the inside of the tank 12 is divided into two in a liquid-tight manner.