JPS62216620A - Manufacture of filter element - Google Patents

Abstract

PURPOSE:To obtain a filter remarkably increased in a filter area by folding one sheet of sheet-like element material and closing in a bellows-shaped folded part wherein inner parts are concentrated and forming a side wall by means of the parts folded in the inside through slits. CONSTITUTION:A filter element 10 is constituted of both a filter face formed by folding an element material 12 and a ring-shaped frame plate 14. The filter face is folded in a bellows-shape by alternately providing chevron folded lines and valley folded lines on the element material 12 consisting of sheet-like filter paper, and providing both end-part folded lines rectangularly crossed to these folded lines and slits cut along the chevron folded lines from respective end-part folded lines. The end parts provided with slit parts are folded into the inside while accompanying contrarotation of the valley folded lines, and opposite end parts thereof are bonded with each other. Then the center parts of the chevron folded lines and the valley folded lines are concentrated and the end faces of the element are bonded with each other and these are bonded to a ring-shaped frame body, and thereby the filter element 10 which is lightweight and low in cost is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a filter element used, for example, in a vacuum removal machine or an air cleaner for an automobile.

(Prior Art) As a conventional filter element, for example, one used for an automobile air cleaner is schematically shown in FIG. 8. A filter element 2 is formed by an element cord 1 bent into a bellows shape and formed into an annular shape as a whole. The filter element 2 is housed in a cleaner case 3, and the outside air introduced from the air intake port 3a provided on the side wall of the cleaner case 3 is passed through the filter element 2. T.W.
The air flows through the air and is supplied to the intake passage 4 of the internal combustion engine.

By the way, in the 'FJAk method of the filter element 2, two end plates 5.5a are glued to the upper and lower ends of the filter element 2, and air filtration is performed using the end plates 1-5a.
This is done only with the element material 1 between 5.5a and 5a.

However, in the conventional filter element 2 as described above, the weight increases because the end plates 5, 5a are formed of steel plates or the like.
~Since only the side surface of the material 1 is used for filtration, the filtration area of the element cable material 1 is not very large, and if you try to enlarge it, the filter element 2 will inevitably have to be made larger. was there.

As a technique to solve such problems, the 'IJQ method of the filter, in which one end play 1 of the filter element 2 is abolished, and the side surface of the element cord material 1 is also used for filtration, is a special technique. Although disclosed in Japanese Patent Publication No. 37-647/1 and Japanese Patent Publication No. 53-879, these manufacturing methods had problems as explained below.

(Problems to be Solved by the Invention) In other words, in all of the techniques disclosed in the above-mentioned publications, filter elements are manufactured by mixing filter medium fibers in a liquid and spraying or depositing the mixture into a mold. The filter element manufactured by this method has a small layer thickness and density of the filter medium, and although it can be used as a filter for short-term smoke masks, etc., it is not suitable for use in automatic air cleaners, etc. This technology could not be applied directly to filters that would be used continuously for a long period of time.

The present invention has been made in view of the conventional problems, and its purpose is to eliminate one end plate by devising the folding method of the element material made of filter paper, and to eliminate the filtration. An object of the present invention is to provide a method for manufacturing a filter element that increases its area.

(Means for Solving the Problems J3 J: Effects) In order to achieve this object, the filter element manufacturing method of the present invention is such that the filter elements are arranged alternately along the longitudinal direction of the rectangular sheet-like element material. A mountain fold line, a valley fold line, a pair of end fold lines provided at both ends perpendicular to these fold lines, and cutting along the mountain fold line between each end fold line and the longitudinal edge of the element material. The element material 1 is folded into a bellows shape along the mountain fold line and the valley fold line, and the end of the element material provided with the slit part is folded with the reversal of the valley fold line. Fold it inward, glue the opposing ends together, and
1. Gather the center portions of the mountain fold line and valley fold line toward the center, and glue the same t faces located at the ends of the element material in the transverse direction to face each other. ill! After the filtration surface is retracted, a ring-shaped frame is attached to either the upper or lower side of the filtration surface.

According to the above manufacturing method, the inside is closed by the gathered bellows-shaped bent portion, and a side wall is formed by the portion folded from the sulin 1-, and the bellows-shaped bent portion to be closed and the flllll The overarea of wall portion 'c'dM is significantly increased.

(Example) Hereinafter, an example of the present invention will be explained in detail based on the drawings.
゜1" Figures 1 and 2 show a filter element 10 showing one embodiment of the present invention, and this filter element 1
0 is the element material 12 that constitutes the filtering surface and the frame plate 14
It is composed of.

The filter surface is formed by bending the element material 12 as shown in FIGS. 3 to 6.

That is, as shown in FIG.
Then, it is bent into a bellows shape as shown in FIG. 4 along a valley fold line J: shown by a chain line parallel to the mountain fold line a.

At this time, a slit 16 is provided at the end of the mountain fold line a.

Then, as shown in FIG. 5, the end of the element material 12 is folded inward from the two-dot chain line shown in FIGS. 1 and 2 while reversing the valley fold line (reverse folding) from the slit 16. The side wall 18 is formed by folding and gluing the opposing ends together.

The element material 12 thus bent into a bellows shape is then bent along each fold line a as shown in FIG.

After converging the central part in direction b (indicated by the dashed dotted line in Fig. 5) toward the center, the end faces 2a located at the ends of the element material 12 in the transverse direction are aligned with the mesh marks in the figure, and adhesive is applied. Face-to-face adhesion j2 is performed.

Then, the element cord material 12 is formed into a single bellows-folded shape in which the side wall 18 is almost perfectly circular, and the inside of the side wall 18 is closed by the central bellows part 19. 1.7 is stolen.

The element material 12 formed in this way is
The mountain-folded side is adhered to one side of the frame plate 14. In addition,
This frame plate 14 is formed so that its outer diameter is larger than the outer diameter of the annular element material 12, and its inner periphery is approximately the same diameter as the tip of the folded slit 16.

Filter nilemen [-1] made as above for ¥J
0 is fixed by the outer periphery of the frame plate 14 being sandwiched between the case 22 and the cover 24 of the air cleaner 20, as shown in FIG. The air introduced from the intake port 22a formed in the case 22 passes through the element material 12 of the filter element 10 in the direction of the central axis and is filtered, and then passes through the discharge port 24a formed in the cover 24 as shown in FIG. It is designed to be supplied to the engine.

Now, in the filter element 10 of this embodiment manufactured as described above, the element material 12 is 1
By bending a sheet KW 44, an annular side wall portion 18 and a central bellows 1 that closes the inside of this side wall portion 18 are formed.
9 is formed, and the outside air introduced from the air intake port 22a passes through the side wall portion 18 and the one central bellows portion and is supplied to the air outlet 24a.

Therefore, the air filtration function is provided not only by the side wall portions 18 but also by the central bellows portion 19, and the filtration area is significantly increased. Note that the central bellows portion 19 has a bellows-like bent portion as a reinforcing portion;
It has great strength against axial loads.

By the way, in the above-mentioned embodiment, it was disclosed that the medium heat bellows part 19 has a substantially circular shape, but the invention is not limited to this, and it may be formed into an elliptical shape.

stomach. In this case, the side wall 18 also becomes an ellipse, and the shape of the frame plate 14 also becomes an ellipse.
stomach.

(Effects of the invention) That's all explained! As described above, in the method for manufacturing a filter element according to the present invention, by bending a single sheet-like element material, the inside of the annular side wall portion is closed by the central bellows portion. End plates at the ends are not required. Therefore, the weight of the filter element can be reduced, and together with the reduction in the number of parts, it is possible to reduce costs.

Furthermore, since the side wall portions and the central bellows portion have a filtration function, the filtration area is significantly increased, and the filter element 1 can be made smaller, which provides various excellent effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a filter element manufactured by Example 'C of the method of the present invention, FIG. 2 is a cross-sectional view of the main part taken from the line Figure 5. FIG. 6 is an explanatory diagram showing one embodiment of how to fold the Niremen I material according to the method of the present invention, FIG. 7 is a cross-sectional view showing one embodiment of the filter element in FIG. 8
The figure is a schematic diagram showing a state in which a conventional filter element is attached. 10... Filter element 12... Element material 12a... End Edge 14... Frame plate 16... Slit a...・Yamaori line b・・・・・・
... Valley fold line J I, J2 ... Adhesive part patent applicant Tokyo Yuki Co., Ltd.
Patent Attorney - Kensuke Iro;'; Figure 5 Figure 8

Claims (1)

[Claims] Mountain fold lines and valley fold lines provided alternately along the longitudinal direction of a rectangular sheet-like element material, a pair of end fold lines provided at both ends perpendicular to these fold lines, each end fold line and the element. A slit cut along the mountain fold line is provided between the longitudinal edge of the material, and the element material is bent into a bellows shape via the mountain fold and valley fold lines,
The end portion of the element material provided with the slit portion is folded inward while reversing the valley fold line, the opposing ends are glued together, and the center portions of the mountain fold line and valley fold line are folded toward the center. After forming a filtration surface by bonding the end surfaces located at the transverse ends of the element material face-to-face, a ring-shaped frame is bonded to either the top or bottom of this filtration surface. A method for manufacturing a filter element, characterized in that: