JPH029851Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a filter paper type filter element used in filtration devices such as air cleaners, oil filters, and fuel filters for automobile engines.

《Prior art and its problems》 As is well known, the conventional filter element used in the above-mentioned filtration device is formed by folding a long strip of filter paper multiple times at a certain length to form a bellows shape. The filter paper is erected between parallel donut-shaped end plates so as to form a hollow cylindrical shape as a whole.

In other words, as shown in Fig. 4, the bending ridge lines 1, 1,
A large number of continuous rectangular filter papers 2, 2,
... are arranged in the shape of a chrysanthemum, and are erected to form a hollow cylinder 4 between two parallel end plates 3.

In this type of filter element, in order to increase the filtration area, the outer diameter R1 of the hollow cylinder 4 is
In addition to increasing the inner diameter R2, the area of each filter paper 2, 2, ... is increased, and the arrangement density of each filter paper 2, 2, ... is increased, so that the filter paper 2,
2. There is a means to increase the number of sheets. The above dimension R
If R2 is limited by other factors, the latter method must be used exclusively.

Even if the arrangement density of filter papers is increased, it is necessary to leave a gap between adjacent filter papers that is large enough to allow the fluid to be filtered to circulate properly. This gives an upper limit to the filter paper arrangement density.

In the conventional chrysanthemum-like element shown in Fig. 4,
Arrangement pitch P1 of bending ridge lines 1, 1, ... on the inner circumference side
is essentially smaller than its arrangement pitch P2 on the outer circumferential side. In other words, the arrangement density of filter paper 2, 2,... is
The inner side is higher and the outer side is lower. Therefore, the filter paper 2,
Even if the arrangement density of filters 2, .

In this way, with conventional chrysanthemum-shaped elements, there is inevitably a large difference in the arrangement density of the filter paper between the inner and outer peripheries. The resulting large amount of wasted space cannot essentially be eliminated.

<<Purpose of the invention>> The object of the invention is to provide a filter element that can further increase the arrangement density of filter papers and increase the filtration area while maintaining good fluid circulation.

<<Structure of the invention>> In order to achieve the above object, this invention is characterized by an arrangement pattern of filter paper that satisfies each of the following constitutions (a) to (d).

(a) Angle 2π/n with respect to the center line of the hollow cylinder above
(n is an integer of 6 or more) rotationally symmetrical n basic patterns are consecutive.

(b) The folding ridge lines on the outer circumferential side of the filter paper group included in one basic pattern are arranged at substantially equal pitches substantially along the outer circumferential circle or the outer circumferential chord.

(C) Among the folded ridge lines on the inner circumferential side of the filter paper group, the plurality of bent ridge lines on one side are arranged at approximately equal pitches along the inner circumferential circle, and the remaining plural pieces on the other side are arranged on the filter paper surface of the adjacent basic pattern. are arranged roughly along the

(d) Each of the pair of filter papers connected to each other via the folded edge line on the inner circumference side of the filter paper group is arranged at an acute angle slightly opened toward the outer circumference.

<<Embodiment>> FIG. 1 shows a filter element according to an embodiment of this invention. In the filter element of the present invention, a large number of rectangular filter papers that are continuous through the folding edges are vertically arranged between two parallel donut plate-shaped end plates, and the space occupied by these filter papers is the entire space. The basic structure of forming a hollow cylinder is the same as before. In FIG. 1, R1, R2, ... represent filter paper, P1, P2,
... and Q1, Q2, ... indicate bending ridge lines. Further, 10 indicates the outer circumference of the hollow cylinder, 12 indicates the inner circumference, and 14 indicates the center.

The arrangement pattern of the filter paper in this embodiment is a pattern that is rotationally symmetrical at an angle of 2π/8 with respect to the center 14 of the hollow cylinder. In other words, eight basic patterns form a continuous pattern.

One basic pattern includes 18 filter papers R1 to R1.
Contains 8. These 18 filter papers R1 to R18
are continuous via nine bending ridge lines P1 to P9 on the outer circumferential side and six bending ridge lines Q1 to Q9 on the inner circumferential side.

The bending ridge lines P1 to P9 on the outer circumferential side are arranged substantially along the outer circumferential circle 10 at substantially equal pitches.

Of the bending ridgelines Q1 to Q9 on the inner circumferential side, five bending ridgelines Q1 to Q5 on one side are arranged substantially along the inner circumferential circle 12 at substantially equal pitches. The remaining four folding ridge lines Q6 to Q9 on the other side are arranged substantially along the surface of the filter paper R1 of the adjacent basic pattern.

18 pieces of filter paper R1 included in one basic pattern
-R18 are arranged in a pair that are connected via the bending ridge lines _Q1 to _Q9 on the inner circumference side, each forming an acute angle slightly opened toward the outer circumference. In other words, a pair of filter papers R ₁ and R ₂ on both sides of the folding edge Q _{1 ,}
The filter papers R ₃ , R ₄ . . . on both sides of the filter paper R 3 , R 4 . While maintaining this relationship, the arrangement pitch of each of the filter papers R1 to R18 is set to be uniform.

A comparative explanation of the embodiment shown in FIG. 1 and the conventional chrysanthemum-shaped filter element is as follows.

FIG. 2A shows a 45° pattern of a conventional chrysanthemum-like element. This 45° pattern includes five bending ridgelines on the inner circumferential side, and the arrangement pitch of these bending ridgelines is set to the minimum allowable value. However, the arrangement pitch of the bending ridge lines on the outer circumferential side is very rough, resulting in more wasted space than necessary. This is the conventional problem mentioned above.

Therefore, in the filter paper arrangement pattern shown in Figure 2A,
Move the bending ridgeline on the outer circumference side to one side to reduce the arrangement pitch. This results in an array pattern as shown in FIG. 2B. In case B, a large space E is created on one side of the 45° area. This space corresponds to the wasted space accumulated on the outer circumferential side in the pattern A.

The arrangement pattern of FIG. 2C is the same as that of the embodiment of the present invention shown in FIG. This pattern is B
Eight pieces of filter paper R are placed in the space E in the pattern of
11 to R18 are arranged. As is clear from this, the filter element of the present invention has a higher arrangement density of filter papers than the conventional chrysanthemum-shaped element, and also reliably maintains the necessary gaps between each filter paper.

Figure 3 shows another embodiment of this invention.
The arrangement pattern differs from the arrangement pattern of the embodiment shown in FIG.
Depending on the method of folding the filter paper, the filter paper shown in FIG. 3 is easier to manufacture than the filter paper shown in FIG.

<<Effects of the invention>> As explained in detail above, in the filter element according to this invention, the arrangement density of the filter paper in the hollow cylindrical space is almost uniform, no wasted space is generated, and the fluid flow is improved. The arrangement density of filter papers can be uniformly increased while maintaining the intervals necessary for circulation, and the filtration area can be made larger than that of conventional filters.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a filter element according to an embodiment of the present invention, FIG. 2 is a diagram for comparing and explaining the filter element in FIG. 1 and a conventional element, and FIG.
This figure is a partial view of a filter element according to another embodiment of the present invention, and FIG. 4 is a schematic diagram of a conventional filter element. R1-R9...Filter paper, P1-P9...Folding ridgeline on the outer circumference side, Q1-Q9...Folding ridgeline on the inner circumference side, 1
0...Outer circumference circle, 12...Inner circumference circle, 14...Center line, 16...Outer circumference chord.

Claims (1)

[Claims for Utility Model Registration] A large number of rectangular filter papers that are continuous through folding ridges are erected between two parallel end plates, and the space occupied by these filter papers has a hollow cylindrical shape as a whole. A filter element in which the arrangement pattern of filter paper satisfies the following configurations (a) to (d). (b) ...Angle 2π/with respect to the center line of the hollow cylinder above
n (n is an integer of 6 or more) rotationally symmetrical basic patterns are consecutive. (b)...The folding ridge lines on the outer circumferential side of the filter paper group included in one basic pattern are arranged at substantially equal pitches substantially along the outer circumferential edge or the outer circumferential chord. (c)...The plurality of bent ridge lines on the inner circumference side of the filter paper group are arranged at approximately equal pitches along the inner circumference, and the remaining plurality on the other side are arranged on the filter paper surface of the adjacent basic pattern. are arranged roughly along the (d)...A pair of filter papers connected to each other via a folding edge line on the inner circumference side of the filter paper group are arranged at an acute angle slightly opened toward the outer circumference.