JPH0215548Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a filter paper type filter element used in filtration devices such as air cleaners, oil filters, and fuel filters of 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 Figure 2, 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 R4 of the hollow cylinder 4 is
In addition to increasing the inner diameter R1, the area of each filter paper 2, 2, . . . is increased, and the arrangement density of each filter paper 2, 2, .
2. There is a means to increase the number of sheets. The above dimension R
4. If R1 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 Figure 2,
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, 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).

(b)...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 filter papers included in one basic pattern are arranged substantially parallel to each other at substantially constant intervals along the radius line of the hollow cylinder.

(c)...The folding ridge lines on the outer circumferential side of the filter paper group are arranged at substantially equal pitches substantially along the outer circumferential circle.

(d) The plurality of inner bending ridge lines on either side of the filter paper group are arranged at approximately equal pitches along the inner circumferential circle, and have approximately equal lengths that are approximately equal to the length between the inner and outer circumferential circles. In the approximately triangular cylindrical part defined by the terminal filter paper surface of this approximately equal length section and the starting end filter paper surface of the approximately equal length section of another adjacent basic pattern, the remaining plural pieces on the other side are the starting end filter paper. They are arranged so that the length becomes shorter almost along the surface.

<<Embodiment>> FIG. 1 shows a filter element according to an embodiment of this invention. The filter element of the present invention also has a large number of rectangular filter papers that are continuous through the folding ridge line and are vertically arranged densely between two parallel donut-shaped end plates, and the area occupied by these filter papers is The basic structure of the space forming a hollow cylinder as a whole is the same as before. In FIG. 1, R1, R2, ... indicate filter paper, P1,
P2,... and Q1, Q2,... indicate bending ridge lines,
10 is the outer circumferential circle of the hollow cylinder, 12 is the inner circumferential circle, 1
4 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 line 14 of the hollow cylinder. In other words, eight basic patterns form a continuous pattern.

One basic pattern includes 24 filter papers R1 to R2.
Contains 4. These 24 filter papers R1 to R24
are arranged approximately parallel to each other at approximately constant intervals along the radius line of the hollow cylinder.

Among the filter paper groups R1 to R24 arranged substantially in parallel, the extended surface of the filter paper located at a position offset to the R1 side substantially passes through the center line 14 of the hollow cylinder. In other words,
The center of the array of filter papers R1 to R24 is R12, R13
Nearby, R7 is closer to R1,
The extension surface around R8 almost passes through the center line 14. In other words, the radius line passing through the center 14 approximately coincides with R6 and R7.

As shown in the figure, the filter papers R1 to R24 have bent ridge lines P1 to P12 on the outer circumferential side and folded ridge lines Q1 to Q on the inner circumferential side.
It is continuous through 12. The bending ridge lines P1 to P12 on the outer circumferential side are arranged substantially along the outer circumferential circle 10 at substantially equal pitches.

Furthermore, among the folding ridgelines Q1 to Q12 on the inner circumferential side, five folding ridgelines Q1 to Q5 closer to the filter paper R1 side are arranged at approximately equal pitches along the inner circumferential circle 12 to form folding ridgelines Q1 to Q5. 10 pieces of filter paper R2 on both sides of
R11 is a substantially equal length portion having a length substantially equal to the distance between the inner and outer peripheral edges 10 and 12.

The surface of the filter paper R11 from beginning to end of this approximately equal length portion and the approximately equal length portion R2' of the other basic pattern adjacent to the left direction.
The remaining seven bending ridge lines Q6 to Q12 on the other side are located within the approximately triangular cylindrical portion (the part surrounded by the imaginary line in FIG. 1) defined by the starting end filter paper R2' surface of R11'.
are arranged at predetermined intervals almost along the adjacent basic pattern filter paper R2'.

With the above filter paper arrangement pattern, as is clear from the figure, the filter papers are arranged at a uniform density with a predetermined spacing in any part of the hollow cylinder, eliminating wasted space as in the past. not exist.
In addition, since the filter papers R1 to R24 and R'1 to R'24 are arranged along the radius line of the hollow cylinder, the filter papers R1 to R24 and R'1 to R'24 are arranged along the radius line of the hollow cylinder. Due to the pressure of the fluid to be filtered flowing in the radial direction with respect to the center line 14, the spacing between the filter papers becomes difficult to approach, and the angle at which the filter papers intersect with the flow direction of the fluid to be filtered increases,
As the length of the filter papers becomes shorter, the rigidity increases accordingly, so that the spacing between the filter papers can also be maintained.

<<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 uniform, no wasted space is generated, and the flow of fluid is improved. The arrangement density of the filter papers can be uniformly increased while maintaining the required average spacing, and the filtration area can be made larger than that of the conventional method while maintaining the spacing between the filter papers.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a filter element according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional filter element. R1, R2...Filter paper, P1, P2...Folding ridge line on the outer circumference side, Q1, Q2...Folding ridge line on the inner circumference side, 1
0...outer circumference circle, 12...inner circumference circle, 14...center line.

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/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 filter papers included in one basic pattern are arranged substantially parallel to each other at substantially constant intervals along the radius line of the hollow cylinder. (c)...The folding ridge lines on the outer circumferential side of the filter paper group are arranged at substantially equal pitches substantially along the outer circumferential circle. (d)...The plurality of inner bending ridge lines on either side of the filter paper group are arranged at approximately equal pitches along the inner circumferential circle, and have substantially equal lengths that are approximately equal to the length between the inner and outer circumferential circles. In the approximately triangular cylindrical portion defined by the terminal filter paper surface of this approximately equal length section and the starting end filter paper surface of the approximately equal length section of another adjacent basic pattern, the remaining plural pieces on the other side are the starting end. The filters are arranged in order of length almost along the filter paper surface.