JPS631409A - Filter element - Google Patents

Abstract

PURPOSE:To obtain a filter element which is apparently stable and small in pressure drop by allowing the height of a top part or at least one part of a bottom part of the cross-sectional corrugated part of a ring-shaped filter form which is constituted by bending a lamellate filter medium having a trapezoidal shape in to a cross-sectional corrugated shape to differ from the other part. CONSTITUTION:Both the folding width between respective two adjacent parts of folding lines b'-b-k-k' in the region of one end side a-a' of a lamellate filter medium having a trapezoidal shape and the folding width between the end parts a-a' and b'-b are all the same but are made smaller in comparison with the folding width between respective two adjacent parts of the folding lines k-k'-q-q' in the region of the other end side r-r'. The filter medium bent like this is curved in a ring-shape so that one end a-a' is at an inner peripheral side and the other end r-r' is at an outer peripheral side and the curved parts a-r and a'-r' are joined and fixed by a joining part 8 consisting of a resin material to obtain a ring-shaped filter form 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas or liquid filtration element used in an air cleaner for an automobile internal combustion engine.

[Conventional technology]

A conventionally known spiral element 1 is shown in Fig. 1. The configuration of this filtration element 1 is as follows. The belt-shaped prefabricated material 2, which has a flat plate shape 2a on one side and a corrugated sheet shape 2b on the other side, is folded in half at the boundary and wound in a spiral shape around the axis 3 with the corrugated sheet shape 2b side inside. In addition, when winding the furnace material 2 around the shaft center 3, as shown in FIG.
The gap between the portion a and the corrugated plate-like portion 2b is filled with adhesive 4 to form a seal portion.

In this filtering element 1, contaminated air travels through a flow path formed between a flat plate-like portion 2a and a corrugated sheet-like portion 2b as shown by the arrow in FIG. 2, and further flows through the walls of the flow path. cleansed by.

[Problem that the invention seeks to solve]

The conventional spiral element 1 described above has the following drawbacks.

(1) One half of the band-shaped filter medium 2 has a flat plate shape 2a and the other half has a corrugated plate shape 2b. Fold it in half at the boundary, and as it is wound around the axis with the corrugated side 2b inside, the flat plate-shaped 2a
The length of the portion is longer than the length of the corrugated plate-like portion 2b.

This problem becomes more noticeable as the diameter of the spiral element 1 increases, and there is a drawback that the corrugated plate-shaped portion 2b for preventing adjoining p-materials 2 from coming into contact with each other is crushed.

(2) Adjacent band-shaped filter media 2 near the end on the inlet side of contaminated air
Since the gap between the flat plate-shaped portion 2a and the corrugated plate-shaped portion 2b is filled with the adhesive, the inflow area of the contaminated air on the inlet side becomes about half of the end face on the inlet side, causing passage resistance of the contaminated air.

(3) Due to the use of adhesive, the overlapping area is reduced only in the adhesive layer portion. In addition, there is a drawback that a sufficient cleaning effect is not achieved due to peeling of the adhesive layer due to external force acting on the filtering element.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention bends a plate-shaped filter medium, which has one end shorter and the other end longer than the one end, into a wave-shaped cross section between the one end and the other end, and The material is curved into a ring shape so that the one end of the material is on the inner circumferential side and the other end is on the outer circumferential side, and the curved ends are fixed to each other, thereby forming a number of planar ring-shaped cross sections extending outward. A ring-shaped filter having a corrugated portion is configured, and the width of at least one fold between two adjacent folds for bending the material into the wave shape is different from the width of the other folds, Thereby, at least one of the top and bottom of the corrugated cross-sectional portion of the ring-shaped filter body is different from other portions in terms of height in at least one portion of the plurality of ring-shaped corrugated cross-sectional portions. This method was adopted.

〔Example〕

The present invention will be explained in detail below using specific examples.

3 to 5, as shown in FIG. 3, a trapezoidal plate filter medium 5 whose width at one end is short and whose width at the other end is long
A large number of folding lines bb'...q-q' are formed.

In the many folding lines of the furnace material 5, one end side a of the material 5
The folding width between each two adjacent folding lines b-b'...k-k' in the area of -a' and the folding width between the ends a-a' and bb' are both Although the same, the folding line k-k'...q-q in the area of the other end side r-r'
' is made smaller than the folding width between two adjacent lines. Note that the adjacent folding widths of the folding lines k-k'...q-q' and the end portions r-r' are the same.

FIG. 4 shows a state in which the above-mentioned resin material 5 is bent along each folding line between one end a-a' and the other end r-r' in a wave-shaped cross section.

The furnace material 5 bent in this way is bent into a ring shape such that one end a-a' is on the inner circumferential side and the other end r-r' is on the outer circumferential side. '...r' are joined and fixed by a joining part 8 made of a resin material. As a result, as shown in FIG. 5, a ring-shaped filter body 7 is obtained in which a large number of planar ring-shaped cross-sectional waveform portions 7a continuously extend outward from the center thereof. According to this ring-shaped filtration body 7, based on the difference in the folding width of the folding line of the furnace material 5 shown in FIG. 3, as is clear from FIG. ring-shaped cross-sectional corrugated portion 7 of
The height position of the top part 70 of a is the same as that of the outer peripheral side, whereas the height position of the bottom part 71 of the inner peripheral side cross-sectional corrugated part 7a is lower than that of the outer peripheral side.

By the way, FIGS. 6 to 8 show a case in which a ring-shaped filter is constructed by making all the folding widths of the filter media 5 shown in FIG. 3 the same.

As is clear from FIGS. 6 and 7, in the ring-shaped filter body 7 of this comparative example, the folding widths of the furnace material 5 are all the same, so the height dimensions of the numerous ring-shaped cross-sectional corrugated portions 7 are all the same. be.

9 to 12 (comparative example) showing the support structure of the ring-shaped filter body 7 of this comparative example and the ring-shaped filter body 7 of the above-mentioned present example in the casing of an air cleaner for an internal combustion engine. ) and FIG. 13 (this example).

To explain this support structure, in FIGS. 9 to 12, a resin or metal ring-shaped receiving frame 10 composed of a cylindrical portion 10a, a ring-shaped seat portion 10b, and a radial support portion 10c is used. The furnace overbody 7 is placed on the receiving frame 10 as shown in FIG. Further, on the outer periphery of the receiving frame 10, a ring-shaped presser frame 1 made of resin or metal as shown in FIG.
1 are connected to each other via an adhesive through the ring-shaped groove 11a. An elastic ring-shaped gasket 12 made of rubber or resin is fitted or adhered to the outer peripheral flange portion 1lb of the holding frame l1. A presser frame 11 is attached to the outer periphery of the furnace body 7.
is attached. On the other hand, the three legs 13 shown in FIG.
Support frame l3 in which the tip 13c of a is welded and fixed to the case 15
1% of the cylindrical portion of the receiving frame 10 is supported on the disk portion 13b of
One gasket 12 is supported between a cap 14 and a case 15. Also, attach the hole 1 of the receiving frame 10 to the bolt l7.
0d, pass through the hole 13d of the support frame 13 and tighten the wing nut 18. In the figure, 16 indicates a ring-shaped gasket (rubber, resin), and 19 indicates an inlet provided in the cap 14.

FIG. 13 shows the support structure of this embodiment, in which the support portion 10c of the receiving frame IO is formed in a step-like manner based on the difference in height of the cross-sectional corrugated portion 7a of the ring-shaped filter body 7. is different from that in FIG. 9, and the other configurations are the same as in FIG. 9.

By the way, it is desirable to reduce the height of an air purifier for an internal combustion engine in order to install it in a vehicle, but in the comparative example, the height of the ring-shaped cross-sectional corrugated portion of the furnace overbody is all the same, and it is horizontal. It has a structure. Therefore, in order to reduce the height of the air purifier, for example, if the gap between the case 15 and the furnace overbody 7 is made smaller as shown in FIG.
The space on the downstream side becomes narrower. This results in an increase in ventilation resistance.

On the other hand, according to the filter body 7 of this embodiment, as is clear from FIG. 13, a large space can be secured on the downstream side of the filter body 7,
Therefore, no increase in ventilation resistance occurs.

In addition, in the above air purifier, in addition to the furnace body, various functional parts, such as a sensor for detecting the temperature of the air taken into the air purifier, are installed, but in the comparative example shown in FIG. There is a large possibility that the functional parts will interfere with the downstream end of the overpass member 7, making it difficult to install them. This is because, as mentioned above, the space on the downstream side is narrow.

In contrast, in this embodiment, as described above, a large space on the downstream side of the furnace body can be ensured, so that the above-mentioned functional parts can be easily attached.

Furthermore, when assembling an air cleaner into an internal combustion engine, even if there is a problem that the lower surface of the air cleaner's casing interferes with other parts, in this embodiment the shape of the lower surface of the casing is adjusted to match the cross section of the furnace body 7. Interference can be avoided by changing the height according to the height of the waveform portion 7a.

FIGS. 14 and 15 show other embodiments of the present invention.

In this embodiment, one end A-A' and the other end M-M' are arcuate surfaces, folding lines B-B'...L-L' are arcuate lines, and two folding lines F- A fan-shaped mesh member 5 is used in which the folding width between F' and GG' is larger than the folding width of a large number of folding lines on both sides thereof. In addition, in this resin material 5, the folding widths other than the folding width at the intermediate portion are the same as shown in FIG. 14.

When the ring-shaped filter body 7 is constructed using the filter medium 5 shown in FIG. 14, it is as shown in FIG. 15. As is clear from this FIG.
The height dimension of a increases stepwise.

According to FIGS. 14 and 15, the starting material 5 is fan-shaped, the folding line is a circular arc, and the line of the arc (for example, B-B') is at a 90° angle with both edges of the r material 5. Because it forms an angle of ? Since there is no difference in the circumferential length of the P overlay 7, there is no need to use a stretchable material for the lining material 5, and any material such as paper, nonwoven fabric, felt, etc. can be used. In addition, each arcuate folding line BB' in FIG.
・For the L-L' creasing, use a creasing roller,
Alternatively, it may be carried out by a method such as heat pressurization.

FIGS. 16 and 17 show still another embodiment of the present invention.

In this embodiment, in the folding lines m-m'...u-u', one end 1-2', between the folding lines m-m', between the folding lines n-n'-o-o', and between the folding lines P -p-q-q
', the folding widths between the folding lines r-r'-s-S', and the folding lines -L'-u-u' are made the same. Also, between the folding line m-m'-n-n', between the folding line 〇1o'-p-p', and between the folding line q-q'-
The folding widths between r and r', between folding lines s-s'-t-t', and between one end of folding lines u-u' and the other end v-v' should be the same, and the width should be smaller than the above-mentioned folding width. It has been made larger.

Furthermore, the portions with smaller folding widths and the portions with larger folding widths are arranged with respect to each other.

When using the filter medium 5 shown in Fig. 16, as shown in Fig. 17,
A ring-shaped filter body in which the lines connecting each neck part 70 and each bottom part 71 of the ring-shaped cross-sectional corrugated part 7a are parallel to each other and slope upward, and the height positions of the top part 70 and bottom part 71 change continuously. 7 is composed.

Note that the trapezoidal filter medium 5 shown in FIG. 3 may be made of a stretchable material as shown in FIGS. 18 and 19. That is, the furnace material 5 shown in FIGS. 18 and 19 has minute "wrinkles" on its surface, and the furnace material 5 is bent into a wave shape as shown in FIG. When curved into a ring shape, the above-mentioned "wrinkles" expand and contract on the curved surface. Therefore, it is possible to absorb the difference in circumferential length due to the difference in radius when curving into a ring shape, and it becomes very easy to curve into a ring shape.

In addition, in the present invention, the above-mentioned FIG. 15 and 17? Both ends of the p-type overbody 7 are joined by a joint part 8 made of a resin material, and when this joint part 8 is molded, an axial center part 21 (for example, an elastic elastomer such as polyurethane) and a ring-shaped support part in FIG. 22 (an elastic elastomer such as polyurethane) or the like may be integrally molded into the cover body 7. The shaft center portion 21 is shown in FIG. 5, for example. 1st
5 and 17, the folded part of the filter body 7 is buried, and both ends 21a, 2lb of the shaft center portion 2l and the support portion 22 are embedded in the filter body 7 in the casing. It serves as a seal to airtightly support the

In addition, in the present invention, there is a small gap between two adjacent folds of a large number of folds in the furnace material. The folding width of at least one fold is different from that of the other, so that at least one of the top and bottom of the ring-shaped cross-sectional corrugated portion of the ring-shaped filter body is at least one portion of the ring-shaped cross-sectional corrugated portion. Any structure may be used as long as the filter body is different in height from other parts.

〔Effect of the invention〕

The effects of the present invention detailed above are enumerated as follows.

(1) In the present invention, a plate-shaped filter medium having one end shorter and the other end longer than the one end is bent into a wave-shaped cross section between the one end and the other end, and the one end of the bent rod material is bent inside. circumferential side,
The filter is curved into a ring shape so that the other end is on the outer peripheral side, and the curved ends are fixed to each other, thereby forming a ring-shaped filter body having a large number of planar ring-shaped cross-sectional corrugated portions extending outward. Since the furnace material is not spirally wound like the conventional spiral type p-type element, the corrugated portion of the furnace material is not crushed during this winding.
Therefore, a filtration element with stable appearance can be obtained.

(2) It is not necessary to fill the adjacent gap material portion near the fluid inlet side end with adhesive, as in the conventional spiral type overflow element, and therefore it is possible to prevent the p overpass area from decreasing due to the adhesive.

(3) In conventional spiral filter elements, there is a risk that the adhesive may peel off, and therefore there is a concern that the function as a filter element may be compromised, but this does not occur with the present invention.

(4) In the present invention, the width of at least one fold between two adjacent folds for bending the furnace material as described in (1) above is different from the width of the other folds,
Thereby, at least one of the top and bottom of the cross-sectional corrugated portion of the ring-shaped filter body obtained using this filter medium is different in height from other portions in at least one portion of the cross-sectional corrugated portion.

Therefore, in the present invention, compared to the case where the top and bottom of the cross-sectional corrugated part of the ring-shaped filter are set at the same height position, the casing that accommodates the ring-shaped filter, the top and/or the bottom of the filter, Alternatively, it is possible to secure a dimensionally large space between the reactor and the bottom, and the existence of this large space reduces the pressure loss of the fluid passing through the reactor body, and also allows other parts to be placed in the above space. It is possible to set

(5) Furthermore, in the present invention, the height position of the top and/or bottom of the corrugated cross-sectional portion of the furnace body can be easily changed by folding back the rod material into a corrugated cross-sectional shape. Compared to the case where the height position of the top and/or bottom part is changed by pulling, no unreasonable force is applied to the overcoat itself, and therefore no deterioration such as breakage of the overcoat occurs.

[Brief Description of the Drawings] Fig. 1 is a perspective view showing a conventional example, Fig. 2 is a perspective view of a furnace material portion used to explain the operation of the conventional example in Fig. 1, and Figs. 3 to 5 are in accordance with the present invention. Figure 3 is a developed view of the filter material, Figure 4 is a perspective view showing the filter material in Figure 3 in a bent state, and Figure 5 is a diagram showing the manufacturing process of the filter element in the filter element. FIGS. 6 to 8 are views showing the manufacturing process of a filter body as a comparative example for explaining the present invention. FIG. Fig. 8 is a perspective view showing the filter body, Fig. 9 is a sectional view showing an air purifier using the filter body of Fig. 8, and Figs. Fig. 12 is a perspective view showing the receiving frame, presser frame, and support frame in Fig. 9, Fig. 13 is a sectional view showing an air purifier using the filter body shown in Fig. 5, and Figs. 14 and 15 are FIG. 14 is a diagram showing the manufacturing process of a 7P overbody in another example of the present invention.
The figure is a developed view of the furnace material, FIG. 15 is a perspective view showing the furnace body, FIGS. 16 and 17 are views showing the manufacturing process of the furnace body in another example of the present invention, and FIG. 16 is a diagram showing the manufacturing process of the furnace body in another example of the present invention. Developed diagram of furnace material, 1st
Fig. 7 is a perspective view showing the p-transfer body, Fig. 18 is a plan view showing another example of the filter medium when manufacturing the p-transfer body shown in Figs. 3 to 5, and Fig. 19 is the filter medium shown in Fig. 18. FIG. 20 is a perspective view showing another embodiment of the present invention. 5... oak wood, 7...? a body, 7a... cross-sectional waveform part, 8... joint part, 70... top part, 71... bottom part.

Claims (4)

[Claims] (1) A plate-shaped filter medium having one end short and the other end being longer than the one end is bent into a wave-shaped cross section between the one end and the other end, and the one end of the bent filter medium is on the inner peripheral side. ,
Curved into a ring shape so that the other end is on the outer peripheral side and the curved ends are fixed to each other, thereby forming a ring-shaped filter body having a large number of planar ring-shaped cross-sectional corrugated parts extending outward, The width of at least one fold between two adjacent folds for bending the filter medium into the wave shape is different from the width of the other folds. A filtration element, wherein at least one of the top and bottom portions is different in height from other portions in at least one portion of the plurality of ring-shaped cross-sectional corrugated portions. (2) The folding widths between two adjacent folds of the plurality of folds in the region on the one end side of the filter medium are the same, and two adjacent folds of the plurality of folds in the region on the other end side of the filter medium are the same. The folding widths between the rings are the same, and the folding widths of the plurality of folds in the one end region are smaller than the folding widths in the other end region. The filtration element according to claim 1, wherein the height of the ring-shaped cross-sectional corrugated portion is lower than the height of the ring-shaped cross-sectional corrugated portion in the outer peripheral side region of the ring filter body. (3) The folding width between two adjacent folds located in the middle of the filter medium among the plurality of folds of the filter medium is the same as the fold width between two adjacent folds of the plurality of folds on both sides.
The width of the folds is larger than the width of the folds between the rings, and the widths of the folds are constant, so that the height of the corrugated cross-sectional portion in the middle of the multiple corrugated cross-sectional portions of the ring-shaped filter body is stepped. The filtration element according to claim 1, characterized in that the filter element has a height of . (4) The plurality of folds of the filter medium are composed of folds with a long fold width and folds with a short fold width, and the folds with a long fold width and the folds with a short fold width are arranged alternately. 2. The filter element according to claim 1, wherein the height of the ring-shaped cross-sectional corrugated portion of the ring-shaped filter body changes continuously.