JPH0556172B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present application relates to a filter element used, for example, in an air cleaner for an internal combustion engine.

[Conventional technology]

A filter element used in an air cleaner for an internal combustion engine, etc., is made by folding a rectangular sheet of paper 1 into folds 2 at predetermined intervals as shown in FIGS.
A structure in which a chrysanthemum-shaped material which is pleated along the length is arranged around the porous inner cylinder 3, both ends of the pleated material are joined, and upper and lower end plates 4 and 5 are provided at the upper and lower ends, and these are integrated. belongs to.

Such a filter element 10 is used by being fixed in a casing 8 having an inlet and an outlet 6, 7 by a fitting 9. The inlet 6 is connected to the casing 8
In contrast, it is provided almost horizontally, and the outlet 7 hangs downward.

The suction air flows into the casing 8 from the inlet 6 and passes through the inner wall of the casing 8 and the filter element 1.
It enters the filter element 10 horizontally from the gap 11 between it and the outer periphery. The suction air that has passed through the filter element 10 is turned downward and flows out towards the outlet 7.

[Problem that the invention seeks to solve]

In the conventional filter element 10, the upper and lower ends of the pleated overbody are covered by the upper and lower end plates 4 and 5, and do not serve as a flow path. Therefore, when disposed inside the casing 8 and used as an air cleaner,
The suction air first enters the gap 1 between the casing 8 and the filter element 10, as shown by the arrow in FIG.
1 in the horizontal direction, and then, after passing through the filter element 10, changes direction almost vertically. This extreme change in the flow path of the intake air increases the flow resistance. Furthermore, the inner circumferential portion of the filter element 10 has a smaller diameter than the outer circumferential portion, and the density of the pleats is large, resulting in a problem of high flow resistance on the intake air outlet side. Furthermore, when this type of filter element is installed and used in a casing, the air intake flows from the outer periphery of the filter element toward the inner periphery, so it is necessary to provide a gap 11 between the filter element 10 and the casing 8. Moreover, this gap must be made large in order to prevent an increase in flow resistance. In this case, the size of the air cleaner will be increased.

[Means for solving the problem] It has folds of pleats at predetermined intervals, and every other fold has chevron-shaped folds on one side edge, and is continuous on the surface of one side edge and the back side of the other side edge. A rectangular sheet of paper coated with an adhesive was pleated along the fold line, and both ends were joined to form an annular overbody, with annular seals provided at the inner periphery of the upper end and the outer periphery of the lower end. It was made into a structural filter element.

[Effect]

The suction air enters between the folds at the upper end of the filter element and between the folds at the outer periphery and flows out from the inner periphery and the lower end of the filter element without extreme changes in direction.

〔Example〕

FIG. 1 shows an air cleaner housing a filter element 20 according to an embodiment of the present invention, in which an upper case 2 is provided with an inlet 21 in the horizontal direction.
2 and a lower case 23 with an outlet 22a in the center.
The filter element 20 is mounted in a housing formed by the above. In the figure, 24 indicates mounting bridges 25, 26, 27 provided on the lower case 23.
is a packing, 28 is a bridge with a nut, and 29 is a center bolt. Filter element 20
An annular seal member 30 on the outer periphery of the lower end is sandwiched between the upper and lower cases 22 and 23, and is held within the housing by a center bolt 29.

As shown in FIGS. 2 and 3, the filter element 20 is made by folding a rectangular sheet-like paper 31 and joining both ends to form an annular overbody 32, which has an inner peripheral edge 33 at the upper end and an outer peripheral edge 34 at the lower end. Annular seal bodies 35, 30 are provided at the ends (FIG. 1). The rectangular sheet-like paper 31 is provided with folds 36 at predetermined intervals, and has a chevron-shaped fold 37 at one side edge 38. The chevron-shaped fold 37 has its top connected to the lower end of the pleat fold 36,
Every other crease 36 of the pleat is formed. An inverted chevron-shaped fold 37a is provided at the upper end of the pleat fold 36 next to the chevron-shaped fold 36. Furthermore, an adhesive 40 is continuously applied over a predetermined width to the surface of one side edge 38 and the back surface of the other side edge 39 of the sheet-like paper.

Such a sheet paper 31 is folded along the folds 36, 3.
7, the upper ends of the pleat pieces a and b of the pleat 41 are brought into close contact with each other, and a chevron-shaped overwall 42 is formed below the top of the pleat 41, as shown in FIG.
Fold piece b and other folds 41 that have formed on the fold piece
A continuous annular overbody is formed in which the folds c and the folds c are in close contact with each other at the lower end. Upper inner periphery of overbody 3
3 and the lower end outer peripheral edge 34 are provided with elastic annular seal bodies 35 and 30, and the filter element 20
is formed. This filter element 20 is
The space between each fold 41, 41 is open at the upper end and closed at the lower end, forming a structure.

As another example, as shown in FIG. 4, a rectangular sheet of paper 45 having pleats 43 at predetermined intervals and chevron-shaped folds 44 at every other lower end of the pleats 43 is prepared as described above. The filter element is made by pleating the material. In yet another embodiment, as shown in FIG. 5, there is a chevron-shaped fold having pleat folds 46 at predetermined intervals, and every other pleat fold 46 having an upper end apex extending to the upper end of the pleat fold 46. A rectangular sheet of paper provided with 47 is pleated as described above to form a filter element. Furthermore, as another embodiment, as shown in FIG.
A filter element is obtained by pleating and folding a rectangular sheet-like paper in the manner described above, in which a chevron-shaped fold 47 is provided at every other pleat fold 46 and the upper end apex extends to the upper end of the pleat fold 46. That is. Furthermore, as shown in FIG. 8, it is also possible to use a sheet paper 50 in which the height of the inverted chevron-shaped fold extending from one side end of the fold is higher than that of the inverted chevron-shaped fold shown in FIG.

In FIG. 1, suction air is introduced from an inlet 21, passes through a filter element 20, and exits toward an outlet 22. The suction air flowing into the filter element 20 is directed from between the creases 41, 41 at the upper end of the filter element 20 and between the creases 41, 41 on the outer periphery toward the outlet side as shown by the arrow without drastically changing the direction. , circulated. When flowing out from the filter element 20,
The suction air flows out not only from the inner periphery of the filter element 20 but also from the lower end thereof.

〔effect〕

When the filter element of the present invention is installed inside the casing and used, the suction air flows toward the outlet without changing direction drastically after entering the filter element, so that the flow resistance is small. Become. In addition, the intake air is
Since it flows out not only from the inside of the filter element but also from the lower end, the outlet area becomes large and the flow resistance becomes small. Furthermore, the upper end of the filter element also serves as an inlet surface for intake air, and the same flow resistance as before can be obtained without increasing the gap between the outer periphery of the filter element and the inner wall of the casing, so the air cleaner does not need to be enlarged.

[Brief explanation of the drawing]

FIG. 1 is a cross section of an air cleaner having a filter element of the present invention, and FIG. 2 is a plan view of a sheet of paper for obtaining the filter element of the present invention.
Figures 3A and 3B are partial perspective views of the paper body, Figure 4
5 is a plan view of a sheet-like paper for another embodiment, FIG. 6 is a plan view of a conventional sheet-like paper, and FIG. 7 is a cross-sectional view of an air cleaner having a conventional filter element. FIG. 8 is a plan view of a sheet of paper for an embodiment of the invention. 31...sheet-like paper, 36,37...fold, 40...adhesive, 41...fold, 35,30
...Annular seal body.

Claims (1)

[Claims] 1. A rectangular sheet having folds at predetermined intervals, a chevron-shaped fold on one side of every other fold, and adhesive on the surface of one side and the back of the other side. A filter element in which a sheet of paper is pleated along the fold line and both ends are joined to form an annular overbody, and annular seals are provided at the inner peripheral edge of the upper end and the outer peripheral edge of the lower end of the overbody.