JPH067766Y2 - Filter element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field The present invention relates to a fluid filter element, for example, an element for a fuel filter of an internal combustion engine.

(Prior Art) A conventional fluid filter, such as a fuel filter for an internal combustion engine, uses a filter element in which a filter paper is pleated to form a chrysanthemum shape and its end face is bonded to an end plate. The end plate is made of an iron plate or a synthetic resin, and the end surface of the filter medium is bonded to the flat surface of the end plate with an adhesive (epoxy resin or the like). The end plate made of synthetic resin may be extended in a plate shape to the periphery and may also serve as a cover of the filter casing that accommodates the filter element.

(Problems to be solved by the invention) In the above filter element, if the conditions such as the characteristics of the adhesive and the cleanliness of the end plate flat surface are unsuitable, the adhesive layer and the end plate may peel off and leak. May occur or the filter medium may fall off. In addition, the manufacturing process requires an adhesive coating step and an adhesive drying step for several hours, which results in low productivity.

Therefore, it is conceivable that the end plate is made of synthetic resin, and its surface is melted into a fluid state and replaced with an adhesive, but with the conventional end plate shape that remains flat, the surface should be in a uniform fluidized state. It takes considerable skill to heat,
A large amount of heating is required, and even a slight overheating softens or deforms the entire end plate. If the heating is not sufficient, the viscosity of the filter medium remains high and the end face of the filter medium is pushed in, causing the end face of the filter medium to bend, or the melt is extruded to the outside of the filter medium without conforming to the shape of the end of the filter medium. The end face cannot be embedded. These cause leakage due to poor adhesion. This phenomenon is remarkable when the synthetic resin material used for the end plate has a high melting point and a high viscosity.

(Means for Solving the Problem) The present invention is directed to that the end face of the filter material folded in a chrysanthemum shape is embedded in the melted and solidified layer formed on the flat portion of the synthetic resin end plate, and the peripheral portion of the end plate is surrounded. The radial projections are arranged radially inside the fold valley of the filter medium. The end plate may be extended in the outer peripheral direction and double as a cover of the filter casing.

(Operation) The fluid filtering operation of the filter element of the present invention is the same as the conventional one. Since the end face of the filter medium is embedded in the layer formed by melting and solidifying a part of the material forming the end plate without using the adhesive, peeling between the end plate and the adhesive layer does not occur. Further, the melted and solidified layer formed on the flat portion of the end plate can have a low viscosity and a good fluidity in a molten state before solidification, so that when the filter medium end face is pushed in, the filter medium end face is well adapted to the shape of the end face. Embedded and sticks. Further, the portion not removed by the filter medium is prevented from being washed away and is swelled up by being blocked by the convex portion, so that the end face of the filter medium is embedded and effectively fixed. As mentioned above, it is possible to have a good flowability when melting, if the surface to be joined of the end plates is provided with a planned fusion part in advance and the surface of the convex part is heated a lot This is because it is not necessary to heat the flat portion uniformly and strongly because the portion first obtains high fluidity and flows into the flat portion to accumulate. Further, since the flat portion is not heated strongly, hardening or deformation of the entire end plate can be avoided.

(Embodiment) FIG. 1 shows an embodiment of the present invention. The filter element 1 is formed by joining a filter material 2 made of filter paper folded in a chrysanthemum shape to an upper end plate 3 on the upper end surface and a lower end plate 4 on the lower end. The upper end plate 3 is provided with a cover 3a extending in a disk shape laterally, and a casing 6 is formed by the cover 3a and the body 5 to form a filter containing the filter medium 2. Both the top plate 3 and the bottom plate 4 are made of polypropylene and have a radially convex portion from the periphery to the inside.
10 and 11 are provided, and melted and solidified layers 15 and 16 are formed in the remaining flat portions 13 and 14, and the end surfaces 8 and 9 of the filter medium 2 are embedded therein. Further, the outer edges 17, 18 are provided outside the end faces 8, 9 of the filter medium 2.
Is provided in an annular shape, and inner edges 19, 20 are provided in an annular shape inside the inner periphery. The upper end plate 3 is provided with a fluid outlet 21. The body 5 has a fluid inlet 22 and is joined with the cover 3a to form a casing 6. 1 shows the AA cross section of FIG. 2, and FIG. 2 shows the lower end plate 4 in the BB arrow view of FIG.

FIG. 3 shows the lower end plate 4a before melting at the same sectional position as the lower end plate 4 in FIG. A planned fusion portion 31 is formed on the upper surface of the convex portion 11 and the flat portion 14.
a and 31b are formed. The planned melting portions 31a and 31b are melted and brought into fluidity by bringing the metal heating plate 30 heated by high frequency induction close to each other. In this case, since the planned melting portion 31a on the convex portion 11 is closer to the metal heating plate 30 than the planned melting portion 31b on the flat portion 14, the fluidity is increased faster, and the molten material flows down to the flat portion 14 on both sides of the convex portion 11 and melts. Flat part 1 with planned part 31b
Collect in 4. At this time, the end surface 9 of the filter medium 2 is pushed in to form an embedded state. The melted portion removed by the filter medium 2 is blocked by the convex portion 11, the outer edge 18 and the inner edge 20 and rises around the end surface of the filter medium 2, so that the melted portion is not washed away to the other and facilitates embedding in the end plate. . It is sealed and fixed as the melting part cools and solidifies.

The end plate may be heated by the above high frequency induction, irradiation with far infrared rays, or any other suitable method. The fixed state of the upper end plate 3 is similar to that of the lower end plate 4.

(Effect of the Invention) In the filter element of the present invention, since the end surface of the filter medium is embedded in the melted and solidified layer formed on the flat portion between the convex portions of the end plate, the peeling as in the case of using the adhesive is eliminated. Since the melted and solidified layer stopped at the convex portion completely embeds the end surface of the filter medium and the end plate is not deformed, the element is excellent in a sealed state and does not cause leakage. Further, the manufacturing process is simple and quick, and the productivity is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment, FIG. 2 is a view of a lower end plate, and FIG. 3 is a view of a lower end plate before melting. 2 ... Filter medium, 3 ... Top plate 4 ... Bottom plate, 10, 11 ... Convex portion 13, 14 ... Flat portion 15, 16 ... Melt / solidified layer

Claims (1)

[Scope of utility model registration request] 1. An end face of a filter medium folded in a chrysanthemum shape is embedded and fixed in a molten and solidified layer formed on a flat portion of a synthetic resin end plate, and each pleated portion of the filter medium is provided from a peripheral portion of the end plate. A filter element in which convex portions are provided radially in the valley.