JPH0414111Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a filter element, and in particular, the present invention relates to a filter element in which filter paper is bent into a bellows shape, and each ridgeline of the bellows-like bent portion is oriented in the central axis direction. The present invention relates to a filter element which is arranged in a circular manner.

《Prior art》 A filter element equipped with this kind of filter paper is
It is called a pocket sector element and is used in some engine air cleaners.

By the way, the filter paper wrapped around the annular shape of this pocket fan-shaped element is designed to be closed on the inner and outer circumferential sides, but conventionally, the inner and outer circumferential sides were each closed with an inner tube made of hard synthetic resin. It is closed by covering it with an outer cylinder, and inner and outer flanges for attachment are provided integrally protruding from the inner cylinder and the outer cylinder.

The filter element is attached by sandwiching these inner and outer flanges between the case and cover of the air cleaner.

<<Problems to be solved by the invention>> However, in the case of such conventional filter elements, flanges are integrally protruded from the inner and outer cylinders made of hard synthetic resin that cover the inner and outer peripheries of the annular filter paper. As a result, the inner and outer flanges are also made of hard synthetic resin, and when these flanges are clamped between the case and the cover, the inner and outer flanges are clamped together. There is no flexibility to absorb dimensional errors or distortions, and there is a risk that airtightness will deteriorate and dust leaks will occur.

In addition, since the entire inner and outer periphery of the annular filter paper is surrounded by the inner and outer cylinders, the resistance of passing air increases, which causes various problems such as a reduction in the filter paper function. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a filter element that can absorb errors between the case and the cover and reduce ventilation resistance.

<Means for Solving the Problems> In order to achieve the above object, the present invention involves folding a filter paper into a bellows shape into an annular shape such that each ridgeline of the bellows-like folded portion is oriented in the direction of the central axis. In a filter element that is wound around the filter paper, and the inner and outer peripheral sides of each bellows-shaped folded portion of the filter paper that has been wound in this way are closed, so that fluid passes through the filter paper portion approximately in the direction of the central axis, The outer periphery of the annular filter paper is covered with an outer cylinder made of a hard synthetic resin to close the outer periphery of each of the bellows-shaped folded parts, and an outer flange is integrally provided from the outer cylinder, while each of the above-mentioned The inner circumferential side of the bellows-shaped folded portion is closed by adhesive, and an inner flange made of soft synthetic resin is attached to the inner circumferential side,
By gluing and closing the bellows-shaped folded part on the inner circumferential side of the annular filter paper, the inner circumferential side is largely opened,
In addition to reducing air resistance, by forming the inner flange on the inner circumferential side of the annular filter paper from soft synthetic resin, the outer flange made of hard synthetic resin can hold the filter element. This is done reliably and allows for dimensional errors in the soft inner flange portion.

<<Example>> Hereinafter, an example of the present invention will be described in detail based on the drawings.

That is, FIG. 1 shows a filter element 10 showing one embodiment of the present invention, and as described in the prior art, this filter element 10 is called a so-called pocket fan-shaped element, and the filter element 10 is equipped with a filter paper. 12 is bent into a bellows shape, and each ridgeline 14 of this bent portion is aligned with the central axis C.
It goes around in a ring so that it points in the right direction. As shown in FIG. 2, the outer periphery of this annular filter paper 12 is covered with an outer cylinder 16 made of a hard synthetic resin, for example, hard urethane, and the outer periphery of each bellows-shaped folded part 18 is closed by this outer cylinder 16. It is becoming more and more common. Further, an outer flange portion 20 is integrally formed and protrudes from the outer side of the outer cylinder 16.

On the other hand, the inner periphery of the annular filter paper 12 is closed by directly hot-melting adhesive M the inner periphery of the bellows-shaped folded portion 18 without using the conventionally provided inner cylinder. A ring-shaped inner flange portion 22 made of a soft synthetic resin, such as soft urethane, is attached to the inner periphery of the lower end of the annular filter paper 12.

As shown in the schematic diagram of FIG. 3, when this filter element 10 is used, for example, in an engine air cleaner as shown conventionally, the outer flange portion 20 is clamped between the periphery of the case 30 and the cover 32. At the same time, the inner flange portion 22
is clamped between the case 30 and the inner periphery of the cover 32 via a stay 40. The air taken in from the air introduction passage 34 passes through the filter paper 12 of the filter element 10 from below to above, and then returns to the inner flange portion 22.
The air is discharged from a central opening to a lower air outlet 36, and is supplied to an intake passage of an engine (not shown).

Note that the stay 40 is provided with a window hole through which filtered air passes.

With the above configuration, in the filter element 10 of this embodiment, the filter element 10
The inner flange part 22 and the outer flange part 20
When the filter element 10 is clamped and installed between the case 30 and the cover 32 via Since the inner flange portion 22 is made of soft synthetic resin, slight deformation is allowed, and the case 3
0 and the inner and outer flange parts 20 and 22 of the cover 32
It is possible to absorb dimensional errors and distortions between the clamping parts of the filter element 10, and to ensure airtightness between the primary side and the secondary side of the filter element 10.

Furthermore, the air passing through the filter paper 12 passes from below to above, and since the inner circumferential portion of the filter paper 12 has each bellows-shaped folded portion bonded with hot melt adhesive,
Since a gap A exists between the folded parts bonded with hot melt, the filtered air passes not only through the upper surface of the filter paper 12 but also through this gap A.
Airflow resistance will be significantly reduced.

<<Effects of the invention>> As explained above, in the filter element of the present invention, the inner circumferential side of each bellows-shaped folded portion of the annularly folded filter paper is closed by adhesive, so that the filtered air is annularly folded. Since it is discharged not only through the outlet in the central axis direction of the filter paper, but also through the gaps between the bonded folded parts, the ventilation resistance is significantly reduced, and the filtration function can be improved.

In addition, the inner and outer flange parts of the filter element are made of soft synthetic resin, and the outer flange part is made of hard synthetic resin. Because it is becoming more and more
The hard outer flange part can securely hold the filter element, and the soft inner flange part can absorb dimensional errors and distortions between the mounting parts of the outer flange part of the case and cover. This provides an excellent effect in that airtightness between the primary and secondary sides of the filter element can be reliably maintained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the filter element of the present invention, FIG. 2 is an enlarged perspective view of the main part of the filter element of the present invention, and FIG. 3 is a schematic diagram showing the installed state of the filter element of the present invention. It is. 10...filter element, 12...filter paper,
14...Ridge line, 18...Accordion-shaped folded portion, 20...
...outer flange part, 22...inner flange part.

Claims (1)

[Scope of utility model registration request] A filter paper folded into a bellows shape is wound around in a ring so that each ridgeline of the bellows-like folded portion is oriented toward the central axis.
In a filter element in which the inner and outer circumferential sides of each bellows-shaped folded portion of the filter paper thus wound are closed, so that fluid passes through the filter paper portion approximately in the direction of the central axis, the annular The outer periphery of the filter paper is covered with an outer cylinder made of a hard synthetic resin to close the outer periphery of each of the bellows-shaped folded parts, and an outer flange is integrally provided from the outer cylinder, while each of the bellows-shaped folded parts A filter element characterized in that the inner peripheral side of the filter element is closed by adhesive, and an inner flange made of soft synthetic resin is attached to the inner peripheral side.