JPH02207807A - Annular filter element - Google Patents

Abstract

PURPOSE:To improve the filtration performance of the element by providing first plural mountains and valleys on one direction of a sheet-shaped filter medium, furnishing second mountains and valleys in the direction crossing the first mountains and valleys and pressing the top of the second mountain and the bottom of the valley inward to form the annular filter medium. CONSTITUTION:The sheet-shaped filter medium is puckered to form the filter element 1 in which many mountains and valleys are formed in series, and first plural mountains 2 and valleys 3 are provided from one end of the filter medium to the other end. The medium is puckered in the direction crossing the first mountains 2 and valleys 3 to form the second mountains 4 and valleys 6 at regular intervals, and the top of the second mountain 4 and the bottom of the second valley 6 are respectively pressed inward or folded to form a recessed part 5. In addition, both end faces parallel to the first mountains 2 and valleys 3 are bonded to obtain an annular element. As a result, the filtration performance is improved, an increase in the pressure drop is prevented, and the life cycle is prolonged.

Description

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

[Conventional technology]

It is generally known that there are two types of elements used in air cleaners such as internal combustion engines: dry type and wet type. In either case, the filtration method is surface filtration,
Depth filtration is the mainstream. The requirements for such an air cleaner element include having filtration performance that effectively removes particulates such as dust present in the fluid to be filtered, and maintaining good filtration performance over a long period of time. It is.

From this point of view, various elements have been provided in the past.For surface filtration, there are filter paper with a fluffed surface, those with irregularities added through special processing to increase the actual surface area, special adhesive materials, etc. There are products that are coated with oil to facilitate the formation of a dust cake layer and extend their lifespan. On the other hand, as a depth filtration element, an element is known in which filter papers having different fiber densities are bonded together to provide a density gradient in the thickness direction of the filter paper.

Incidentally, an air cleaner filter for an internal combustion engine uses the above filter element, but the conventional air cleaner filter 21 has an air cleaner case 22 as shown in FIGS. 17 to 18.
The filter element 23 is made up of a cylindrical filter paper formed by sliding it into a number of mountain shapes, and the air, which is the fluid to be filtered, has a population of 22. The air is sucked into the air cleaner case 22, flows along the inner peripheral surface of the air cleaner case 22, and then flows from the outer peripheral side to the inner peripheral side of the cylindrical filter element 23. At this time, the air is filtered by the filter element 23, and only clean air from which dust has been removed is discharged from the outlet 22.

[Problem to be solved by the invention]

However, in the conventional air cleaner filter element as described above, the flow path length is not constant (the flow path length is For example, point a and b
(point b is longer) The flow velocity in each part of the filter element is not uniform, so the air flow path resistance on the filter paper of the filter element is not uniform, and the flow velocity passing through the filter paper is different in some parts, resulting in uniform filtration. The problem is that it is impossible.

In addition, in conventional filters, the spaces that trap dust are connected in the same shape, and the dust that has been trapped and accumulated moves to areas with low pressure drop where no dust has yet adhered, reducing the dust adhesion area. There was a problem in that the width was widened and the pressure drop increased.

Furthermore, with conventional filters, the filtered fluid hits a fairly wide area, creating turbulent flow, which causes an increase in pressure loss, and the collision effect of dust adhesion is reduced, resulting in fewer heaped-up particles being captured, resulting in a shorter life cycle. There were also points.

The present invention was devised in view of the above circumstances, and its purpose is to provide a filter element for air cleaners that can improve filtration performance, prevent pressure loss from increasing, and have a long life cycle. There is a particular thing.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a filter element in which a sheet-like filter medium is bent and a large number of peaks and valleys are connected to each other, and a plurality of first peaks are formed from one end of the filter medium to the other end. A trough is provided, and a plurality of second crests and troughs are provided by bending at predetermined intervals in a direction intersecting the first crest and trough, and the top of the second ridge and A recess is formed by pushing the bottoms of the second troughs inward or folding them in, and further
An annular filter element was constructed by joining both end faces parallel to the peaks and valleys of the filter element.

Further, a plurality of first peaks and a plurality of first valleys are provided from one end of the filter medium to the other end, and the filter medium is bent in a direction intersecting the first peaks and valleys to form a second peak and a second valley. A filter element having a trough, the first trough being bordered by the second trough, and the first trough being bordered by the first trough. are arranged in a row, and a recess is formed by pushing the top of the second peak inward or by folding it in, and further, both end surfaces parallel to the first peak and valley are joined. An annular filter element was constructed.

Furthermore, assuming a virtual central transverse plane that includes a bending ridgeline of any of the first peaks located at the innermost side of the annular filter element, the bending edge of the first peak on the virtual central transverse plane is In addition to tilting the ridgeline to an arbitrary angle,
All the second peaks connected in the outward direction are also configured to be inclined in conjunction with each other.

[Effect]

According to the configuration of the present invention, the flow path length is approximately constant and the flow velocity in each part of the filter element is uniform, so the flow path resistance of the fluid to be filtered applied to the filter element is uniform, so that uniform filtration can be achieved. It can be carried out.

In addition, by dividing the dust adhesion space into small rooms, the fluid to be filtered passes through many small rooms, which prevents the accumulated dust from moving to other parts, thereby lengthening the life cycle. Since the flow of the fluid to be filtered becomes a laminar flow, the pressure loss is reduced, the impingement filtration effect is increased, and the filtration efficiency is increased.

Furthermore, assuming a virtual central transverse plane that includes a bending ridgeline of any of the first peaks located at the innermost side of the annular filter element, the bending edge of the first peaks on the virtual central crossplane By inclining the ridge line at an arbitrary angle and configuring all of the second peaks connected in the outward direction to incline in conjunction with each other, a filtration channel similar to that of a conventional chrysanthemum-shaped filter element is formed. Therefore, the filter element can be installed in the storage container without changing the shape of the storage part, and the filtration efficiency is increased.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 16.

FIG. 1 shows a perspective view of an embodiment of the present invention.

The filter element 1 has a cylindrical shape and consists of a first peak 2 and a first trough 3 located radially, and a second peak 4 and a second trough (not shown) located concentrically. and
Recesses 5 are formed at the tops of the second peaks and the bottoms (not shown) of the second valleys, respectively.

FIG. 2 shows a perspective view of the basic filter element before joining.

As shown in FIG. 2, the basic filter element BI is made by bending a sheet-like filter medium and providing a plurality of first peaks 2 and first troughs 3 from one end of the filter medium to the other end. 2 and the first valley part 3 at predetermined intervals to provide a plurality of second peak parts 4 and second valley parts 6, and the second peak part 4
The recess 5 is formed by pushing the top and the bottom of the second trough 6 inward or by folding them in.

To form the filter element of FIG. 1, the basic filter element B1 is obtained by bending and joining the front and rear end faces 7.8.

FIG. 3 shows a developed view of the filter element shown in FIGS. 1 and 2.

The filter element 9 has a rectangular shape, and the first
A plurality of first peak and valley portion lines (W −X , ... W −X ) L for forming a peak portion and a first valley portion
l nn is attached. Further, second peak and valley portion lines (Y −21, . . . Y −2
3) is attached. Further, concave portion forming lines 10 are formed so as to surround the intersection points of the peak portion lines and the intersection points of the valley portion lines.
... 10 are provided.

Note that in the drawings, solid lines indicate mountain folds and broken lines indicate valley folds.

Next, a method for manufacturing a filter element will be described in detail with reference to FIGS. 4 and 5.

FIG. 4 shows a schematic explanatory diagram of the process with lines, and FIG. 5 shows a schematic explanatory diagram of the folding process.

First, in order to make it easier to fold folds into the sheet-like filter medium S wound on a roll, the grooved pedestal 11 and the vertically moving sushi attachment are used to sandwich the sheet-like filter medium between the grooved base 11 and the tool 12, so that the sheet-like filter medium S is folded at a constant pitch. (Figure 4).

As a result, a plurality of linear first peaks and valleys lines (W) are formed from one end of the sheet-like filter medium to the other end.

X1...W-X), and a plurality of second straight lines for second peaks and valleys (Y- Z,...Y3z3)
Then, recess forming lines 10, . . . , 10 surrounding the intersection of the first peak and valley portion lines and the second peak and valley portion lines are attached.

Next, a large number of mountain-shaped folds are formed by folding the sheet filter medium S along each stripe (fifth fold).
figure). Thereby, a basic filter element Bl as shown in FIG. 2 can be formed.

Thereafter, the basic filter element B1 formed in the above process is bent and its both end faces 7.8 are joined to form the annular filter element 1, and the process is completed.

In addition, in the process of adding the above-mentioned lines, as shown in Fig. 6, the lines for the second peaks and valleys (Fig. 3
A similar filter element can be obtained by omitting step -23) and performing sushi attachment.

Furthermore, as shown in FIG. 7, the first peak and valley lines (W −X , . . . W −X ) 1 in FIG.
1 n n and 2nd
Yamabe line (Fig. 3 y-z,...Yll
A similar filter element can be obtained even when the sushi attachment is performed by omitting all the lines in the concave forming lines 10 surrounding the intersection of 3z3).

FIG. 8 shows a plan view of the filter element shown in FIG. 1.

Assuming that the fluid to be filtered passes from the front surface to the back surface as shown in FIG. The flow path resistance of the filtered fluid becomes uniform, and uniform filtration can be performed.

In this case, the number of steps in the second peak and valley part was two,
By using the basic filter element B2 as shown in FIG. 9, it is also possible to construct a filter element with more stages.

FIGS. 10 and 11 show a perspective view and a side view of another embodiment of the present invention.

Components that are the same as those in the embodiment shown in FIG. 1 are given the same reference numerals, and detailed explanations will be omitted.

The filter element 13 shown in FIG. 10 differs from the filter element 1 shown in FIG. 1 in that the second mountain portion 4 becomes higher toward the inside.

By adopting such a structure, the outer diameter can be decreased in order to obtain the same filtration area, and the filtration area can be increased in the case where the outer diameter is the same.

As the basic filter element in this case, those shown in FIGS. 12 and 13 can be used.

Basic filter element B3a as shown in FIG.
When a concave space is formed inside, other members can be installed in the space, and the overall space can be reduced.

The basic filter element as shown in Fig. 13 is
When b is used, the filtration area can be greatly increased.

Note that the above basic filter element (Figs. 12 and 13)
It is also possible to form an annular filter element having a second mountain portion that is lower toward the inside by bending the filter element in the opposite direction when bending the filter element (see FIG. 1).

FIG. 14 shows a basic filter element of yet another annular filter element embodiment of the present invention.

Basic filter element B4 is one end of the filter medium.

A plurality of first peaks 14 and first valleys 15 are provided at the other end, and a second peak 16 and a second valley 17 are provided by bending in a direction intersecting the first peaks and valleys 14.15. The filter element is configured such that the first peak portion 14 is separated from the second valley portion 17 as a border.
The first trough 15 is connected to the first trough 15, the first crest 14 is connected to the first trough 15, and the second trough 1 is connected to the first trough 15.
The recessed portion 18 is formed by pushing the top of 6 inward or by folding it.

A major difference from the basic filter element embodiment described above is that the continuous first peaks and valleys overlap at the bottom of the second valley 17.

Other points are the same as those in the Noh embodiment described above.

Note that this basic filter element also has the 12th
It is also possible to adopt a stepped basic filter element configuration similar to the stepped basic filter element B SB shown in FIGS.

FIG. 15 shows still another embodiment of the present invention.

Assuming a virtual central transverse plane including the bending ridge line of any of the first peaks located at the innermost position of the annular filter element as described above, the folds of the first peaks on the virtual central transverse plane are A donut-shaped annular filter element 19 is formed by inclining the curved ridge line at an arbitrary angle and also inclining all the second peaks connected in the outward direction.

The filter element 19 has a shape similar to two stacked donuts, and has a first peak 20 and a first valley 21 extending radially from the center hole C, and a second peak 22 located on the inner and outer circumferences. , a second valley 23. A recess 24 is provided in the second peak and valley.

By configuring as described above, it is possible to form a filtration channel similar to a conventional chrysanthemum-shaped filter, so it can be installed without changing the shape of the storage part, and the space for dust adhesion can be reduced to a small size. By dividing the fluid into rooms, the fluid to be filtered passes through many small rooms, which prevents the accumulated dust from moving to other parts, extending the life cycle and reducing the flow of the fluid to be filtered. Since the flow is laminar, the pressure drop is reduced and the impingement filtration effect is increased, making it possible to increase the filtration efficiency.

FIG. 16 shows a modified side sectional view of the filter element shown in FIG. 15.

FIG. 16(a) shows a configuration in which the tips of the second peaks 22 are spaced apart from each other. Regarding other points, 1
This is similar to the filter element shown in FIG.

FIG. 16(b) shows a configuration in which the tips of the second peaks 22 are close to each other. Regarding other points, 1
This is similar to the filter element shown in FIG.

〔Effect of the invention〕

Since the present invention is configured as described above, the flow path length is approximately constant and the flow velocity in each part of the filter element is uniform, so the flow path resistance of the fluid to be filtered applied to the filter element is uniform, so that This has the effect that it is possible to carry out thorough filtration.

In addition, by dividing the dust adhesion space into small rooms, the fluid to be filtered passes through many small rooms, which prevents the accumulated dust from moving to other parts, thereby lengthening the life cycle. Since the flow of the fluid to be filtered becomes a laminar flow, the pressure loss is reduced, the impingement filtration effect is increased, and the filtration efficiency is increased.

Furthermore, assuming a virtual central transverse plane that includes a bending ridgeline of any of the first peaks located at the innermost side of the annular filter element, the bending edge of the first peaks on the virtual central crossplane When the ridgeline is inclined at an arbitrary angle and all the second peaks connected in the outward direction are also arranged to be inclined, a filtration channel similar to a conventional chrysanthemum-shaped filter element is formed. Therefore, the filter element can be installed in the storage container without changing the shape of the storage part, and the filtration efficiency can be increased.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a perspective view of the basic filter element of the embodiment of Fig. 1, Fig. 3 is a developed view of the embodiment of Fig. 1, and Fig. 4 is a perspective view of the basic filter element of the embodiment of the present invention. The illustration with sushi of the embodiment is a process outline explanatory diagram, FIG. 5 is a folded process outline explanatory diagram of an embodiment of the present invention, FIG.
8 is a plan view of the embodiment of FIG. 1, FIG. 9 is a perspective view of a basic filter element of still another embodiment of the present invention, and FIG. 11 is a side view of the embodiment of FIG. 10, FIG. 12 is a perspective view of the basic filter element of the embodiment of FIG. 10, and FIG. 13 is a perspective view of the embodiment of FIG. 10. A perspective view of another basic filter element of the embodiment, FIG. 14 is a perspective view of a basic filter element of still another embodiment of the present invention,
FIG. 15 is a perspective view of still another embodiment of the present invention, FIG. 16 is a sectional view of a modification of the embodiment of FIG. 15, FIG. 17 is a plan view of a conventional embodiment, and FIG. 18 is a conventional It is an Example sectional view. DESCRIPTION OF SYMBOLS 1... Annular filter element, 2... First mountain part,
3... First valley part, 4... Second peak part, 5... Concave part,
6...Second trough, 7.8...Basic filter element end face, 9...Filter element, 1o...Recess forming line, 11...Pedestal, 12...Socket is a tool , 13... annular filter element, 14... first
Mountain part, 15...First valley part, 16...Second peak part, 17
...Second valley part, 18...Concave part, 19...Annular filter element, 2o...First peak part, 21...First
Valley part, 22... Second peak part, 23... Second valley part, 24
... recessed part, B1 ... basic filter element, B2
...Basic filter element, B33, B3b...
Basic filter element, B4...Basic filter element, C...Center hole. Figure 1

Claims (1)

[Claims] 1. In a filter element in which a sheet-like filter medium is bent to have a number of consecutive peaks and valleys, a plurality of first peaks and valleys extend from one end of the filter medium to the other end. are bent at predetermined intervals in a direction intersecting the first peaks and valleys to provide a plurality of second peaks and valleys, and the top of the second peak and the first A concave portion is formed by pushing the bottoms of the second valley portions inward or by folding them, and further, both end surfaces parallel to the first valley portions are joined to form an annular shape. Annular filter element. 2. The bent ridge lines of the tops of the first peaks that are opposite to each other with the bottom of the second valley as a boundary are in contact with each other, or
The annular filter element according to claim 1, characterized in that the annular filter element is arranged so as to be close to each other. 3. The bent ridge lines at the bottom of the first valley portion, which are opposite to each other with the top of the second mountain portion as a boundary, touch each other, or
3. The annular filter element according to claim 2, wherein the annular filter element is arranged so as to be close to each other. 4. The bent ridges of the tops of the first peaks facing each other with the bottom of the second valley as a boundary are configured to be spaced apart from each other, and the bottom of the second valley is the boundary. 2. The annular filter element according to claim 1, wherein the bending ridges at the tops of the first peaks facing each other are separated from each other. 5. In a filter element in which a sheet-shaped filter medium is bent to have a large number of consecutive peaks and valleys, a plurality of first peaks and first valleys are provided from one end of the filter medium to the other end, Said first
The filter element is provided with a second peak part and a second valley part by bending in a direction intersecting the peak and valley parts of the filter element, wherein the first peak part is provided with the second valley part as a border. The first trough is formed such that the first trough is connected to the first crest, and the top of the second crest is pushed inward or folded in. 1. An annular filter element, characterized in that the filter element is formed into an annular shape by forming a concave portion and joining both end surfaces parallel to the first peak and valley portions. 6. The bending ridge line at the top of the first mountain and the bottom of the first valley, which face each other with the bottom of the second valley as a boundary, is configured to be close to each other. The annular filter element according to claim 5. 7. The structure of claim 5, characterized in that the bent ridge lines at the bottom of the first valley part facing each other with the top of the second mountain part as a boundary are in contact with or close to each other. Annular filter element. 8. The bending ridges at the top of the first mountain and at the bottom of the first valley, which face each other with the bottom of the second valley as a boundary, are configured to be spaced apart from each other, and Second
6. The annular filter element according to claim 5, wherein the bent ridges at the bottoms of the first valleys are separated from each other with the tops of the peaks as a boundary. 9. Assuming a virtual central transverse plane that includes the bending ridgeline of any of the first peaks located at the innermost position, set the bending ridgeline of the first peak at an arbitrary angle on the virtual central transversal plane. The annular filter element according to any one of claims 1 to 8, wherein the annular filter element is inclined and all of the second peaks connected in an outward direction are also inclined.