JPS59194071A - Manufacture of filter of car fuel tank - Google Patents

Abstract

PURPOSE:To enable efficient manufacture of a product of high quality, by a method wherein plastic is used to previously mold an upper drum cylinder and a bottom plate and the upper and the lower end part of a net cylinder are forced to cut into the upper drum cylinder and the bottom plate by high frequency induction heating as the net cylinder is pressed in a condition to nip the net cylinder from above and below by the use of the two parts. CONSTITUTION:An upper drum cylinder 1 consists of a main cylinder 2, having its lower peripheral part coupled to a net cylinder 6, and an auxiliary frame 3 snapped with the upper end of the main cylinder 2. In manufacture, plastic is used to previously mold the main cylinder 2, the auxiliary frame 3, and the bottom plate 5, and after the net cylinder 6 is coupled to the main cylinder 2 and the bottom plate 5, the auxiliary frame 3 is engaged with the main cylinder 2. The net cylinder 6 is disposed such that, after a beltlike net piece made of a metal is bent and both ends are nipped with the aid of an U-shaped metal piece 7 to form a cylinder, upper and lower ends 6a and 6b are mated with the inner peripheries of cylinder walls 2b and 5b, respectively. Under this condition, the net cylinder 6 is heated by a coil connected to a high frequency generator, and this causes the upper and lower ends 6a and 6b to cut into the main cylinder 2 and the bottom plate 5.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is installed in a fuel tank by holding it on the entire inner periphery of the suction port of a pump that supplies fuel (gasoline) to a gasoline generator, for example,
This invention relates to an improved manufacturing method for a filter for an automobile fuel tank, which is most suitable for separating out water and other foreign substances in the tank so that the pump only sucks in fuel and sends it to the carburetor.

These various filters are made of metal or plastic between the lower periphery of the plastic upper plate or upper barrel that holds the pump on the inner periphery, and the periphery of the plastic bottom plate that faces the pump suction port. It is constructed by attaching a mesh tube. However, since the conventional mesh tube is simply a belt-shaped piece of rope bent into a cylinder or square tube shape and connected at both ends, the filtration area is small, and if a small amount of foreign matter becomes clogged, the pump will be able to pump enough gasoline into the vaporizer. The mechanical strength is insufficient, and the mesh tube may become deformed when the pump metal is pushed in and assembled, resulting in a defective product.

Furthermore, the upper end of the mesh tube is connected to the lower circumference of the upper body tube,
To connect the lower end to the peripheral edge of the bottom plate, use the upper barrel,
Each end of the net tube is inserted into the mold for forming the bottom plate, and when molding the upper body tube and bottom plate using the insert molding method, each end of the net tube is embedded as one piece, making the molding process extremely time-consuming. Gaka\shi, productivity is bad.

Therefore, in the present invention, a mesh tube is formed by bending a band-shaped mesh piece made of metal, for example stainless steel, in a zigzag shape and connecting both ends, and the upper body tube and the lower plate are molded in advance from plastic.
The upper and lower ends of the mesh tube are pressed against the lower periphery of the upper barrel and the periphery of the bottom plate, and in this state, the mesh tube is heated by high-frequency induction heating, and the lower periphery of the upper barrel and the periphery of the bottom plate are heated. The disadvantages of the conventional method have been solved by melting each surface of the mesh tube with a mesh tube and filling and bonding each end of the mesh tube, and will be described below with reference to the illustrated embodiment.

Fig. 1.2 shows an example of a filter manufactured according to the present invention, in which the upper body tube l is assembled with the main tube with a mesh tube connected to the T circumference, and the upper end of the main tube is snapped and lowered. The main cylinder has a recess 1' projecting from the outer periphery at its upper end, and the auxiliary frame 3 has an overhang 3' corresponding to the recess 2'. A vent 3a is provided to communicate the inside of the tank with the outside air, and a flexible tube or the like is connected to the vent 3a. Further, the auxiliary frame 3 is provided with an upwardly projecting cylinder 3b whose inner periphery is slightly smaller than that of the main cylinder, and holds the outer periphery of the pump t with a screw X.

The main cylinder Ω has an annular flange 2α extending outward at the lower end,
A short cylindrical wall b protrudes downward from the peripheral edge of the collar 2a.

S is a bottom plate, the outer diameter of which is equal to the flange of the main cylinder, 2 cL, and a short cylinder wall sb projects upward from the peripheral edge.

Therefore, the main cylinder, the bottom plate cylinder Blab, and the left side can face each other in the vertical direction.

The main cylinder unit, the auxiliary frame 3, and the bottom plate S are each molded from plastic, and the auxiliary frame 3 is fitted into the main cylinder after the net is connected to the main cylinder and the bottom plate.

The mesh tube O is made of metal, for example, stainless steel, and is made of a belt-shaped mesh piece of approximately 200 meshes, bent in a zigzag shape, and its both ends are sandwiched between U-shaped metal pieces 7 to form a cylinder shape, and the zigzag state is maintained. When expanded, the outer diameters fit into the inner peripheries of the cylinder walls 2b and 3b, respectively, and the upper end α contacts the lower surface of the collar α, and the lower end contacts the inner upper surface of the periphery of the bottom plate. It is determined that

Therefore, the mesh tube is arranged between the lower surface of the flange λα of the main cylinder and the upper surface of the peripheral edge of the bottom plate, the main cylinder is pressed toward the upper end of the mesh tube, the bottom plate is pressed against the lower end of the mesh tube, In this state, it is placed inside a coil q connected to a high frequency generator g, and a high frequency current is passed through the coil (Fig. 3). The high-frequency current flowing through the mesh tube generates an induced current in the metal mesh tube, causing the mesh tube to rapidly heat up.
One surface of the collar core a and the inner upper surface of the peripheral edge of the bottom plate, which the lower end 6b abuts, are melted, and the upper and lower ends of the net tube bite into them.

The time during which high frequency current is passed through the coil is approximately 2 to 8.
Seconds is enough, so do I apply current after that? Stop, wait for it to cool down, and once it has cooled down, release the pressure between the main cylinder and the lower plate. The upper and lower ends of the mesh cylinder are strongly connected to each other by being slightly buried in the lower peripheral part of the main cylinder and the bottom plate.

If it is necessary to stretch the mesh tube from the inside during high-frequency induction heating, for example, as shown in FIG.
Cylindrical portion 10' of the three-sided force jig 10 consisting of θb and 10b
Fit the mesh tube A'z around the outer periphery of the main tube and stretch it to the specified state. After cooling and joining the mesh tube, pull out the diameter piece 10a upward from the main tube, and then insert the two arc-shaped pieces /θb, IOb f main Just pull it out of the tube.

However, as shown in FIG. 5, the inner side of the cylinder wall 2b and the cylinder wall 5b
If auxiliary cylinder walls 2b' and rbZv are formed on the main cylinder and the bottom plate to fit on the inner periphery of the mesh cylinder, respectively, inside the screen cylinder, the upper and lower ends of the mesh cylinder can be inserted between the cylinder wall and the auxiliary cylinder wall. Since it is only necessary to press the main cylinder and the bottom plate from above and below, there is no need to use a jig in this case.

In short, according to the present invention, the upper body tube and the bottom plate are molded in advance from plastic, and the upper and lower ends of the net tube are bitten in by high-frequency induction heating while being sandwiched and pressed from above and below. Therefore, the filter can be manufactured more easily and without the need for post-processing, compared to the insert molding method in which the upper barrel and bottom plate are molded and then joined together. And since the mesh tube is bent in a zigzag manner, the v5 over area is 2~
In addition to expanding three times, the Kumi-bushi itself plays a role as a support D
', it has mechanical strength, and when the auxiliary frame is lower than the main cylinder, the problem of VC deformation when pushing the pump into the inner circumference of the auxiliary frame is completely eliminated. Moreover, by connecting both ends of the rope piece with the metal piece 7 to form a mesh tube, the metal piece 7 can further reinforce the strength of the mesh tube as a support.

Although the above embodiment has been described with respect to a filter attached to a pump, it is of course applicable not only to a filter attached to a 7'12 but also to a filter attached to a general suction pipe.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional top view of an example of a filter manufactured according to the present invention, Fig. 2 is a partially sectional plan view of the same filter, and Fig. 3 is a partially sectional plan view of the same filter. Figure 4 is a vertical cross-sectional side view of the connected state; Figure 4 is a perspective view of the jig for stretching and expanding the mesh tube;
The figure is a longitudinal sectional side view of another example of the screen tubes fully connected. The top and bottom edges are shown. Patent applicant Nifco Co., Ltd.

Claims (1)

[Claims] A mesh tube in which an upper plate and a bottom metal plate facing the upper plate are each pre-molded of plastic, and the upper and lower ends are joined to the inside of the lower periphery of the upper plate and the periphery of the bottom plate. is made by bending a metal strip into a zigzag shape,
Both ends are connected and formed, and the upper plate is pressed against the upper end of the lower periphery of the wire mesh tube, and the inside of the periphery of the bottom plate is pressed against the lower end of the wire mesh tube, respectively, and in this state, the mesh tube is heated by high-frequency induction heating to generate heat. 1. A method for manufacturing a filter for an automobile fuel tank, which is characterized in that the filter is heated and then cooled.