JPS5828092B2 - Manufacturing method of bulkhead tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a bulkhead tank formed by integrally joining an automobile washer tank and reserve tank.

Conventionally, the washer tank for storing the cleaning unit of an automobile window washing system and the reserve tank for storing the reserve liquid for the radiator were formed from plastic materials using a blow molding method, and were placed separately in the engine compartment. are doing.

However, forming a bulkhead tank in which these tanks are joined together provides greater benefits in terms of securing space and reducing assembly man-hours.

However, there are ways to join these tanks together, such as by adhesive bonding or thermal bonding, but in the former method, the manufacturing process is complicated by applying the adhesive and leaving it to harden. This process is complicated and takes a long time, and complete adhesion is difficult with non-polar plastic materials such as polyethylene and polypropylene.

The latter method is ideal for spot bonding of films/sheets, thin-walled molded products, or small bonding areas, but requires relatively thick walls and large bonding areas such as washer tanks and reserve tanks. In some cases, the bonding surfaces are not heated uniformly, and the bonding condition varies from part to part, resulting in pin poles, reduced bonding strength, etc.
No matter which method was adopted, it was not possible to manufacture a completely joined bulkhead tank.

In view of the above-mentioned problems, the present invention makes the washer tank and the reserve tank stronger by sandwiching a metal body between the joint end surfaces of the washer tank and heating the metal body by electrical means while sandwiching the metal body. It is an object of the present invention to provide a method for manufacturing a bulkhead tank that can be joined to a bulkhead tank and is easy to manufacture.

The method of the present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 1 to 5 showing the first embodiment, 1 is a washer tank that stores the cleaning group of an automobile window cleaning device; 2 is a reserve tank that stores the reserve group of the radiator;゜2 is made of thermoplastic plastic material such as polyethylene, polypropylene, nylon, polycarbonate, etc. by blow molding, and is connected to the opposing side walls 3, 4 of both tanks 1, 2 by protruding from the side walls 3, 4. Surfaces 5 and 6 are formed.

In addition, tank mounting ribs 7.8 are protruded from the opposite wall.
Attachment holes 9, 10 are bored in the rib.

11.12 is liquid inlet, 13.14 is liquid outlet, drain port,
15 is a groove for mounting the washer motor pump.

An integral bulkhead tank 16 is manufactured by joining the joining surfaces 5°6 of both tanks 1 and 2, and this joining is done by joining the joining surfaces 5°6 of both tanks 1 and 2 as shown in FIGS. 3 and 4. A metal body 1 made of a ferromagnetic material such as iron or nickel between the joint end surfaces 5 and 6
7 is sandwiched and held by the pinching device 18.

At the same time, nozzles 19.20 connected to a weighted fluid source are inserted into the liquid inlets 11.12 of both tanks 1, 2 to pressurize the tanks.

Next, in this state, the metal body 17 is heated by electromagnetic induction heating to melt the joining surfaces 5 and 6, and the metal body 17 is sandwiched between the metal bodies 17 and 17 as shown by the arrow A in FIG.

Pressure is applied in direction B to join.

The metal body 17 may be rod-shaped, strip-shaped, porous strip-shaped, net-shaped, or coil-shaped.

Next, to explain the induction heating device in FIG. 5, an AC power supply 25 is energized to coils 28a and 28b via a no-fuse breaker 26 and magnetic switches 27a and 27b, and from the coils 28a and 28b, an alternating magnetic flux is
2 occurs.

In the case of a small tank that requires little heat generation, it is sufficient to turn on one of the magnetic switches.

The magnetic fluxes 01 and u2 pass alone or in combination in a direction perpendicular to the plane of FIG. 4 or in the directions of arrows A and B, causing an eddy current to flow through the metal body 11 and heating it.

Note that the AC power source may be a low frequency (50 to 60 Hz), but high frequency induction heating is preferable.

Although the first embodiment described above uses induction heating as the electrical means, a second embodiment will be described in which the metal body is heated by directly applying electricity.

In FIG. 6, 25a is an AC or DC power supply, and 29 is an energization control device consisting of a breaker, a switch, a transformer, etc.

Reference numerals 30 and 31 are detachable terminals, 17 is a metal body, especially a heater wire, and 1 is a washer tank.

To explain the operation in the above-mentioned interception, when the heater wire 1T receives a current supply from the energization control device 29, the heater wire 17 generates heat and is joined under pressure as in the first embodiment.

After that, the heater wire 17 may be cut at point P.

In each of the above embodiments, the joint surfaces 5 and 6 may have a planar shape as shown in FIGS. A groove into which the metal body 17 fits may be formed in one or both of the grooves.

As described above, in the present invention, the washer tank and the reserve tank are each formed by a blow molding method, and a metal body that generates heat by electrical means is sandwiched between the joint end surfaces of the two tanks, and while Since the metal body is heated and the joint end faces are melted and joined to manufacture the bulkhead tank, a completely joined and integrated bulkhead tank can be manufactured at low cost using simple equipment and processing operations, and the joint part Dogs have the advantage of having excellent mechanical strength because they have a built-in metal body.

In addition, the opposing side walls of both tanks are provided with joint surfaces that protrude from the side walls, and after the metal body is inserted, pressurized fluid is passed through the mouths of both tanks to maintain the insides of both tanks in a pressurized state. Since fusion bonding is used, the joint surfaces of the side walls can sandwich the metal objects well, and the side walls are not deformed during fusion bonding. It has an excellent effect of preventing the formation of a deteriorated tank.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the state of the tank before joining according to the method of manufacturing a bulkhead tank according to the present invention, FIG. 2 is a front view showing the state of the tank after joining, and FIGS. 3 and 4 are A partial sectional view seen from the front showing the joining process of a tank according to the first embodiment of the method of the present invention, FIG. 5 is a schematic electrical circuit diagram of an induction heating device, and FIG. 6 is a second embodiment of the method of the present invention. FIG. 1...Washer tank, 200.10. Reserve tank, 17...metal body.

Claims (1)

[Claims] 1. A washer tank and a reserve tank are each formed by a blow molding method, and the opposing side walls of both tanks are provided with joint surfaces that protrude from the side walls, and a metal body that generates heat by electrical means is sandwiched between the joint surfaces. Next, pressurized fluid is passed through the mouths of both tanks to maintain the insides of both tanks in a compressed state, and the metal body is heated while being pressed between the protruding joining surfaces to melt and join both tanks. A method of manufacturing such a bulkhead tank.