JPH07243356A - Filter element - Google Patents

Abstract

PURPOSE:To improve a life span of a product and to facilitate its assembly by preventing shortening of elapsed time to reach a specified ventilation resistance value. CONSTITUTION:A porous inner cylinder 11 and a porous outer cylinder 12 are concentrally arranged respectively on the inner peripheral side and the outer peripheral side of a hollow cylindrical filter part 2 formed tuck woven sectionally in a shape of chrysanthemum, and their upper and lower end surfaces are blocked with end plates 21, 22. The filter part 2 is furnished with an inward curved part 4 having a cavity 3 between itself and the porous outer cylinder 12 and a projectively curved part 5 making contact with the porous outer cylinder 12 arranged with equal intervals in the circumferential direction on its outer peripheral side. Contact with the porous outer cylinder 12 and the filter part 2 is eliminated by the cavity 3, and accumulation of dust and clogging of a filter medium are not caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element, for example, a filter element used in an air cleaner of an internal combustion engine or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a perforated inner cylinder 11 is provided on the inner peripheral side of a hollow cylindrical filter section 2 in which filter media are alternately pleated at predetermined intervals so as to have a chrysanthemum cross section. There is known a filter element in which porous outer cylinders (protectors) 12 are arranged on the outer peripheral side so as to abut the filter media, and upper and lower end surfaces are closed by end plates.

[0003]

The filter element as described above tends to have a smaller filter size in response to the demand for space saving. However, if the filter size is made smaller, clogging by dust becomes faster. , The elapsed time to reach the predetermined ventilation resistance value becomes shorter. That is, there is a problem that the product life is shortened.

The object of the present invention is to improve the conventional so-called chrysanthemum-shaped filter element as described above, thereby simplifying the production and preventing the shortening of the elapsed time until the predetermined ventilation resistance value is reached. It is to improve the product life. Furthermore, when arranging and housing the filter unit in the outer cylinder,
It is an object of the present invention to provide a filter element that can easily and reliably position the filtering portion without using a jig or the like and can be easily assembled.

[0005]

According to the present invention, a perforated inner cylinder is provided on the inner peripheral side and a perforated outer cylinder is provided on the outer peripheral side of a hollow tubular filter section in which a filter medium is bent to form a chrysanthemum cross section. Each of them is arranged concentrically, and the upper and lower end surfaces are closed by end plates, and the outer peripheral side of the filtering portion has a space (clearance) between itself and the porous outer cylinder without contacting the porous outer cylinder. It is a filter element including a plurality of inner bent portions and a plurality of protruding bent portions that abut the porous outer cylinder.

[0006]

On the outer peripheral side of the filter portion, a plurality of inner bent portions having a gap between the filter portion and the porous outer cylinder are provided without coming into contact with the porous outer cylinder. Since there is no contact area between the filter and the filter, and dust accumulation and clogging of the filter material at that part are less likely to occur, it is possible to prevent shortening of the elapsed time to reach the specified ventilation resistance value and improve the product life. Can be made. In addition, since a plurality of protruding bent portions that come into contact with the porous outer cylinder are provided, when the filtering portion is placed inside the porous outer cylinder and assembled, the protruding bent portion that is the outer edge of the filtering portion contacts the porous outer cylinder, The filtration part can be easily and surely positioned with a predetermined clearance maintained in the bent part, and the assembly can be performed without using a jig or the like.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B show a filter element according to an embodiment of the present invention, in which FIG. 1A is a cross sectional view thereof, and FIG.
2 and 3 are cross-sectional views showing other modes of the filtering unit 2, and FIG. 4 is a perspective view of the filtering unit 2 of the filter element of another embodiment.
FIG. 5 is a cross-sectional view of a conventional filter element.

The filter element 1 includes a filter section 2, a porous inner cylinder 11 located on the inner peripheral side of the filter section 2, and a porous outer cylinder 12 concentrically arranged with the porous inner cylinder 12 located on the outer peripheral side of the filter section.
And the filter part 2 by engaging with the porous inner cylinder 11 and the porous outer cylinder 12.
It is composed of upper and lower end plates 21 and 22 that close the upper and lower end surfaces thereof, and is housed in a casing (not shown) or the like and used as an air cleaner or the like.

The filtering portion 2 forms a large number of parallel folding lines in the height direction of the filtering medium, and the filtering medium is alternately bent along the folding lines to form a pleated fold in a substantially chrysanthemum cross section to form a hollow body as a whole. It is formed in a cylindrical shape. The filter material that constitutes the filter unit 2 is a filter paper, a nonwoven fabric, or the like having a filtering function. On the outer peripheral side of the filtering part 2, a gap (clearance) is formed between the filtering part 2 and the porous outer cylinder 12 without contacting the porous outer cylinder 12.
A large number of inner bent portions 4 having 3 and a plurality of protruding bent portions 5 that abut the porous outer cylinder 12 are provided.

The filtering section 2 forms a large number of parallel folding lines on the filter medium and is bent alternately according to the folding lines so that the bending section on the inner peripheral side of the filtering section and the respective bending sections on the outer peripheral side of the filtering section. Are continuously and alternately formed. Therefore, since it does not have a complicated bending structure, its manufacture is easy. Then, the lengths between the folding lines of the filter medium, that is, the fold-fold intervals are not made uniform, but are lengthened at appropriate places, so that the bent portion on the outer peripheral side in the long fold-fold interval portion becomes the protruding bent portion 5, It is adapted to come into contact with the porous outer cylinder 12.

The fold-folding interval of the inner bent portion 4 is the protruding bent portion 5
Since it is shorter than the pleated fold interval, a space (clearance) 3 is formed between the pleated outer cylinder 12 and the perforated outer cylinder 12 without coming into contact therewith.
have. By providing this void, the contact portion between the porous outer cylinder 12 and the filtration portion is eliminated, and the accumulation of dust and clogging of the filter material at this portion are less likely to occur. It is possible to prevent the shortening of time and improve the product life.

In the embodiment shown in FIG. 1, the fold-fold intervals of the inner bent portions 4 are equal, but they may be formed non-uniformly as shown in FIG. It is better to form the filter part evenly,
Easy to assemble.

The gap between the inner bent portion 4 and the porous outer cylinder 12 can be appropriately set depending on the intended use and size of the filter element. For example, when applied as an air filter element for an automobile internal combustion engine, usually 4 to 15 mm on average is suitable for exerting the effect, and 8 m for a filter element having a diameter of 20 to 30 cm.
About m is preferable. For example, the filter medium height is about 250 mm, the filtration area is about 26000 cm ² , and the number of folds is 115,
A filter element in which a protrusion provided with 12 protruding bent portions for every 10 peaks is internally mounted between a porous inner cylinder and a porous outer cylinder (a porous inner cylinder diameter of about 125 mm and a porous outer cylinder diameter of about 230 mm), and a gap is 8 mm. In the test (JIS car air cleaner test method D1612), the elapsed time of the increasing resistance ΔP is about 1.5 as compared with the case where the number of folds is the same and no void is provided.
~ 2 times, it is possible to extend the life significantly.

The protruding bent portion 5 that abuts the porous outer cylinder 12 is
It is important to provide multiple locations. It is possible to form a gap between the inner bent portion 4 and the porous outer cylinder 12 without providing the protruding bent portion 5, but in that case, a pleated filter portion (which is not always of a standard formability) is formed. However, it is necessary to use a jig or the like in order to dispose and store the above (in other words) in an appropriate position in the outer cylinder and to provide a predetermined clearance for assembly. Therefore, in the present invention, a plurality of projecting bent portions 5 that abut the porous outer cylinder 12 are provided, and the abutment of the projecting bent portions 5 and the porous outer cylinder 12 makes it possible to easily and reliably position the filtering portion. Is.

It is preferable that the projecting bent portions 5 are usually provided at three or more places, although it depends on the intended use, size, number of folds, etc. of the filter element. By providing three or more locations, the positioning of the filter portion when the folded filter portion is placed in the outer cylinder becomes easier and more reliable, and the assembly becomes easier.

If the number of the protruding bent portions 5 is increased too much and the ratio of the protruding bent portions 5 to the inner protruding portions 4 is increased too much, it is possible to prevent shortening of the elapsed time until the predetermined airflow resistance value, which is one of the objects of the present invention, is reached. The effect of improving the product life tends to be low.

It is desirable that the protruding bent portions 5 are arranged at equal intervals in the circumferential direction so that the protruding bent portions 5 can be stably arranged at appropriate positions.

Further, as shown in FIG. 3, the protruding bent portions 5 are adjacent to each other in the circumferential direction with the bent portion 6 on the inner peripheral side of the filtering portion interposed therebetween, or one or a plurality of inner bent portions are provided between the protruding portions 5. You may have the protrusion bending part 5 and 5a which contact | abuts to a porous outer cylinder which makes a set in the aspect which interposed the part. Also in this case, the protruding bent portions 5 and 5a forming a set by adjoining each other or with the inner bent portion interposed therebetween may be arranged at equal intervals in the circumferential direction so that the filter portion 2 is housed in the outer cylinder. In doing so, it is desirable for stable placement at an appropriate position and for simplifying the pleating process.

Each bent portion 6 on the inner peripheral side of the filtration portion 2 is usually
Although it is in contact with the perforated inner cylinder 11, it is not strictly necessary that all the bent portions 6 on the inner peripheral side are in contact with all the perforated inner cylinders 11.

The porous outer cylinder 11 and the porous inner cylinder 12 have substantially the same height as the filtration section 2, and the number of holes, their arrangement, material, etc. are not particularly limited. It does not necessarily have to be cylindrical.

The upper end plate 21 and the lower end plate 22 are engaged with the perforated inner cylinder 11 and the perforated outer cylinder 12 to close the upper and lower end surfaces of the filter section 2, and the fluid is usually as shown by the arrow in FIG. Then, it passes through the filter unit 2 from the outer peripheral side of the filter unit 2 toward the inner peripheral side and is filtered. The shapes of the upper end plate 21 and the lower end plate 22 are not limited to those shown in the figures, and the manner of engagement with the porous inner cylinder 11 and the porous outer cylinder 12 is not particularly limited.

FIG. 4 shows a filter part 2 of another embodiment. The filter part 2 does not abut on the porous outer cylinder at one end in the height direction of the filter part 2 on the outer peripheral side thereof. A slanted bent portion 16 extending from the inner bent portion 14 having a space between the inner bent portion and the outer porous tube toward a protruding bent portion 15 that abuts the porous outer tube at the other end in the height direction of the filtering portion 2. From the inner bent portion 14a having a gap between the other end of the filtering portion 2 in the height direction and not contacting the porous outer cylinder, the one of the other ends in the height direction of the filtering portion 2 The slanted bent portions 16a extending toward the protruding bent portion 15a that abuts the porous outer cylinder at the end portion are formed alternately adjacent to each other in the circumferential direction or at appropriate intervals. Here, with an appropriate interval, there is a non-oblique bent portion between the oblique bent portion 16 and the oblique bent portion 16a, that is, a bent portion along the height direction (even if it is in contact with the porous outer cylinder). It does not have to be in contact with each other), which means that there is one or more interlocking pleats.

With the above-described structure, the filter section 2 has a space formed on the outer peripheral side thereof between the porous outer cylinder and the porous outer cylinder. Since the accumulation of dust and the clogging of the filter medium are less likely to occur in the portion, it is possible to prevent the shortening of the elapsed time until the predetermined ventilation resistance value is reached and improve the product life. In addition, the positioning of the filter part when the filter part is placed and housed in the outer cylinder can be easily and reliably performed without using a jig by the contact between the protruding parts 15 and 15a that come into contact with the porous outer cylinder and the porous outer cylinder. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments and can be appropriately modified and implemented within the scope of the gist of the present invention.

[0025]

According to the present invention, by simply making a simple improvement to the conventional filter element, the manufacturing time can be simplified, and the elapsed time can be greatly extended with respect to the amount of increase in ventilation resistance. It is possible to prevent the shortening of the elapsed time until reaching and to improve the product life. In addition, a filter element is provided that allows easy and reliable positioning of the filter section without using a jig or the like when arranging and housing the filter section in the outer cylinder, and is easy to assemble.

[Brief description of drawings]

1A and 1B show a filter element according to an embodiment of the present invention, in which FIG. 1A is a lateral sectional view thereof, and FIG. 1B is a longitudinal sectional view thereof.

FIG. 2 is a transverse cross-sectional view showing another aspect of the filtration unit 2.

FIG. 3 is a cross-sectional view showing another aspect of the filtration unit 2.

FIG. 4 is a perspective view of a filter unit 2 of a filter element according to another embodiment.

FIG. 5 is a cross-sectional view of a conventional filter element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter element 2 Filtration part 3 Void 4 Inner bent part 5 Projected bent part 6 Inner peripheral bent part 11 Perforated inner cylinder 12 Porous outer cylinder 14, 14a Inner bent part 15, 15a Projected bent part 16, 16a Oblique bent Part 21 Upper end plate 22 End plate

Claims (5)

[Claims] 1. A perforated inner cylinder is concentrically arranged on the inner peripheral side and a perforated outer cylinder is concentrically arranged on the outer peripheral side of a hollow cylindrical filter portion formed by bending a filter medium to form a fold-fold in a chrysanthemum cross section. The end surface is closed by an end plate, the filtering portion, on the outer peripheral side thereof, a plurality of inner bent portions having a gap between the porous outer cylinder and the porous outer cylinder without contacting the porous outer cylinder,
A filter element including a plurality of protruding bent portions that come into contact with a porous outer cylinder. 2. A filter medium is bent in parallel and alternately along parallel fold lines, and a bent portion on the inner peripheral side of the filter portion and each bent portion on the outer peripheral side of the filter portion are continuously and alternately provided, and a cross section of approximately a chrysanthemum flower is formed. In the hollow cylindrical filter section formed in a pleated shape, the porous inner cylinder is concentrically arranged along the bent portion on the inner peripheral side and the porous outer cylinder is concentrically arranged on the outer peripheral side, and the upper and lower end surfaces are closed by the end plates. The plurality of inner bent portions having a gap between the filter portion and the outer porous cylinder on the outer peripheral side thereof without contacting the outer porous cylinder,
A filter element comprising three or more circumferentially arranged protruding bent portions that come into contact with a porous outer cylinder. 3. A perforated outer cylinder, which is adjacent to each other in the circumferential direction with a bent portion on the inner peripheral side of the filter portion sandwiched therebetween, or which forms a pair in a manner in which one or a plurality of inner bent portions are interposed between protruding portions. The filter element according to claim 2, wherein the filter element has a projecting bent portion that abuts against. 4. The filter element according to claim 2, wherein the fold-folding intervals of the inner bent portion having a space between the perforated outer cylinder are uniform. 5. A perforated inner cylinder is concentrically arranged on the inner peripheral side and a perforated outer cylinder is concentrically arranged on the outer peripheral side of a hollow cylindrical filter portion formed by bending a filter medium and folding it into a substantially chrysanthemum cross section. The end surface is closed by an end plate, and the filtration part has a gap between the outer peripheral side and the porous outer cylinder without contacting the porous outer cylinder at one end in the height direction of the filtration part. At the other end in the height direction of the filtering part, and the oblique bend part extending from the inner bent part having the other end in the height direction of the filtering part toward the protruding bent part that abuts the porous outer cylinder. A slant extending from an inner bent portion that does not abut the porous outer cylinder and has a gap between the porous outer cylinder and a protruding bent portion that abuts the porous outer cylinder at one end in the height direction of the filtering portion. -Shaped bent portions are formed alternately adjacent to each other in the circumferential direction or at appropriate intervals. Iruta element.