JP7314784B2 - air cleaner - Google Patents

Description

The present invention relates to air cleaners.

Conventionally, an air cleaner for filtering intake air is provided in an intake passage of an internal combustion engine (see Patent Document 1, for example). The air cleaner described in Patent Document 1 includes a lower housing having an upper opening and an upper housing having a lower opening and attached to the lower housing.

The internal space of the lower housing is partitioned into an air introduction chamber and an air discharge chamber by a partition wall.
An air introduction port for introducing air into the air introduction chamber and an air outlet for discharging air from the air outlet chamber communicate with the air introduction chamber and the air outlet chamber, respectively. The upper housing covers the upper opening of the lower housing.

A sealing member is provided between the upper housing and the lower housing for sealing therebetween.
A filter element is provided between the lower housing and the upper housing so as to block the upper opening of the air introduction chamber. Therefore, the portion of the internal space of the upper housing that is located on the downstream side of the intake air from the filter element constitutes an air outlet chamber together with the air outlet chamber of the lower housing.

In such an air cleaner, intake air introduced from the air inlet into the air inlet chamber of the lower housing is filtered by passing through the filter element. The air that has passed through the filter element passes through the air outlet chambers, that is, the interior of the upper housing and the interior of the lower housing, and is discharged from the air outlet.

Japanese Patent Application Laid-Open No. 2007-100568

By the way, in this type of air cleaner, an air flow meter for measuring the flow rate of intake air is provided at an air outlet (hereinafter referred to as an outlet). In the above air cleaner, the intake air introduced from the air inlet is exhausted from the outlet while meandering in the air introduction chamber and the air outlet chamber. Therefore, the intake air flowing through the outlet tends to be unevenly distributed, and the flow velocity distribution of the intake air tends to vary. As a result, problems such as variation in measured values of the air flow meter may occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air cleaner capable of suppressing uneven distribution of intake air flowing through an outlet.

An air cleaner for achieving the above object is an air cleaner comprising a housing having an inlet and an outlet, and a filter element accommodated in the housing for filtering intake air and dividing the inside of the housing into a dust chamber communicating with the inlet and a clean chamber communicating with the outlet, wherein the housing has a main body portion for accommodating the filter element, and a first folded portion and a second folded portion which are provided with the main portion sandwiched therebetween and are folded back and extended toward each other, The first folded portion has the inlet, the second folded portion has the outlet, and a guide wall that protrudes toward the inside of the main body and guides the intake air away from the second folded portion is provided in a portion of the inner surface of the main body that continues to the inner side of the corner of the second folded portion.

According to this configuration, the first folded portion and the second folded portion having the inlet and the outlet, respectively, are provided with the main body portion of the housing sandwiched therebetween, and are folded back and extended toward each other. In such an air cleaner, the intake air that has flowed into the first folded portion from the inlet is folded back into the main body portion and passes through the filter element. Then, the intake air that has passed through the filter element is folded again in the second folded portion and flows out from the outlet. Therefore, the intake air is folded twice between entering through the inlet and exiting through the outlet.

By the way, the intake air flowing through the first folded portion tends to be unevenly distributed outside the corner of the first folded portion. Therefore, the intake air flowing inside the main body portion tends to be unevenly distributed near the portion of the main body portion that continues to the outside of the corner of the first folded portion, and the intake air flowing inside the second folded portion tends to be unevenly distributed outside the corner of the second folded portion.

According to the above configuration, the guide wall is provided on the portion of the inner surface of the main body that continues to the inner side of the corner of the second folded portion. Therefore, in the main body, the intake air flowing in the vicinity of the inner side of the corner of the second folded portion is guided away from the second folded portion by the guide wall. As a result, the inflow angle of the intake air into the second folded portion becomes smaller than in the configuration without the guide wall. Therefore, uneven distribution of the intake air flowing through the outlet can be suppressed.

1 is a perspective view of an air cleaner according to one embodiment; FIG. The top view of the air cleaner of the same embodiment. FIG. 2 is an exploded perspective view of the air cleaner of the same embodiment; FIG. 3 is a cross-sectional view taken along line 4-4 of FIG. 2; The perspective view which fracture|ruptures and shows some cases of the same embodiment. The perspective view of the cap of the same embodiment. The perspective view which looked at the cap of the same embodiment from the direction different from FIG. FIG. 4 is a diagram schematically showing the flow of intake air inside the air cleaner of the same embodiment, and is a cross-sectional view of the air cleaner showing a part of the cap cut away; FIG. 4 is a cross-sectional view schematically showing the flow of intake air guided by a second guide wall inside the air cleaner of the same embodiment; FIG. 4 is a cross-sectional view schematically showing the flow of intake air guided by a guidance promoting portion inside the air cleaner of the same embodiment;

An embodiment of the air cleaner will be described below with reference to FIGS. 1 to 10. FIG.
<Overall Configuration of Air Cleaner>
The air cleaner of this embodiment is provided in an intake passage of a vehicle-mounted internal combustion engine to filter intake air.

As shown in FIGS. 1 to 4, the air cleaner includes a housing 100 having a tubular inlet 20 and a tubular outlet 40, and a filter element 50 housed inside the housing 100 for filtering intake air and dividing the inside of the housing 100 into a dust chamber D and a clean chamber C. The housing 100 has a flat shape as a whole. As shown in FIG. 3, the filter element 50 has a substantially rectangular shape having long sides and short sides in plan view.

Hereinafter, the direction in which the long side of the filter element 50 extends is referred to as the first direction X, the direction in which the short side of the filter element 50 extends is referred to as the second direction Y, and the direction perpendicular to both the first direction X and the second direction Y is referred to as the third direction Z. 2 are defined as one side in the first direction X and the other side in the first direction X, respectively, and the upper side and the lower side in FIG. 2 are defined as one side in the second direction Y and the other side in the second direction Y, respectively. Also, the upper side and the lower side in FIG. 1 are described as one side in the third direction Z and the other side in the third direction Z, respectively. Further, the upstream side and the downstream side in the flow direction of intake air from the inlet 20 to the outlet 40 are simply referred to as the upstream side and the downstream side, respectively.

The housing 100 has a body portion 110 that accommodates the filter element 50, and a first folded portion 120 and a second folded portion 130 that are provided to sandwich the body portion 110 in the first direction X and are folded back toward each other and extended.

The main body portion 110 has a first main body portion 111 to which the first folded portion 120 is connected, and a second main body portion 112 provided side by side with the first main body portion 111 in a planar direction including the periphery of the filter element 50. In this embodiment, the first main body portion 111 and the second main body portion 112 are provided side by side in the second direction Y. As shown in FIG.

A second folded portion 130 is connected to the second body portion 112 . Therefore, the second main body portion 112 is positioned between the first main body portion 111 and the second folded portion 130 .
The first folded portion 120 is folded back toward the second body portion 112 . Also, the second folded portion 130 is folded back toward the first main body portion 111 .

The dust chamber D is composed of a portion of the first body portion 111 on the upstream side of the filter element 50 and the first folded portion 120 . The clean room C is composed of a portion of the first body portion 111 on the downstream side of the filter element 50 , a second body portion 112 , and a second folded portion 130 .

Such an air cleaner housing 100 comprises a case 10 having an inlet 20 and a cap 30 having an outlet 40 . The case 10 and the cap 30 face each other in the third direction Z. As shown in FIG. Both the case 10 and the cap 30 are made of a resin material such as polypropylene. The case 10 and the cap 30 are fastened by locking a pair of clamps 70 attached to the cap 30 to the case 10 .

<Case 10>
As shown in FIG. 5, the case 10 has a first opening 11 that opens on one side in the third direction Z. As shown in FIG. The case 10 also has a peripheral wall 12 surrounding the first opening 11 and a bottom wall 13 facing the first opening 11 .

A partition wall 14 that protrudes from the inner surface of the bottom wall 13 and extends along the first direction X is provided inside the case 10 . The partition wall 14 is connected to the inner surface of the peripheral wall 12 on both sides in the first direction X. As shown in FIG. The end face of the partition wall 14 is flush with the end face of the peripheral wall 12 . A partition wall 14 partitions the interior of the case 10 into a first chamber 10a and a second chamber 10b.

The first opening 11 is composed of a main opening 11a opening into the first chamber 10a and a sub opening 11b opening into the second chamber 10b. The main opening 11a and the sub-opening 11b are formed adjacent to each other in the second direction Y. As shown in FIG.

As shown in FIG. 4, the filter element 50 is arranged to cover the main opening 11a. Therefore, the first chamber 10 a constitutes a portion of the first body portion 111 on the upstream side of the filter element 50 . Also, the second chamber 10b constitutes a part of the second body portion 112 .

As shown in FIG. 5, the first folded portion 120 described above is connected to the first chamber 10a. The first folded portion 120 protrudes from a portion of the first chamber 10a on one side in the first direction X and is bent toward the second chamber 10b. The first folded portion 120 protrudes to one side in the first direction X from the second chamber 10b. The first folded portion 120 has a top wall 21 facing the bottom wall 13 .

The inlet 20 described above is connected to the top wall 21 and extends toward one side in the second direction Y. As shown in FIG. The inlet 20 extends obliquely with respect to the second direction Y so as to separate from the main body portion 110 toward the tip side. Further, the inlet 20 extends with an inclination with respect to the second direction Y so as to separate from the bottom wall 13 toward the tip side. Therefore, the inlet 20 extends obliquely with respect to the second direction Y so as to be positioned on one side in the first direction X and on one side in the third direction Z toward the distal end side.

As shown in FIG. 4, the first chamber 10a is formed to be deeper in the third direction Z than the second chamber 10b. That is, the portion of the bottom wall 13 forming the bottom of the second chamber 10b is located on one side in the third direction Z relative to the portion forming the bottom of the first chamber 10a.

As shown in FIG. 5, a bulging portion 15 that bulges in the other side in the first direction X from the first chamber 10a is continuously provided in a portion on the other side in the first direction X in the second chamber 10b. The bulging portion 15 forms part of the second folded portion 130 .

A flange 16 is provided along the entire circumference of the peripheral edge of the first opening 11 in the peripheral wall 12 . A seal surface 17 orthogonal to the third direction Z is formed by the flange 16 and the partition wall 14 . The sealing surface 17 has a B shape in plan view.

An outer wall 16a protruding toward the cap 30 is provided over the entire periphery of the flange 16 on the outer peripheral side. An inner wall 16b protruding toward the cap 30 is provided over the entire circumference of the inner peripheral side of the portion of the seal surface 17 surrounding the sub-opening 11b. The outer wall 16a and the inner wall 16b face each other.

A pair of gate-shaped support portions 18 are provided at intervals in the first direction X on the outer surface of the peripheral wall 12 on the other side in the second direction Y. As shown in FIG. Each support portion 18 protrudes to one side in the third direction Z. As shown in FIG.

A pair of locking portions 19 are provided on the outer surfaces of both sides in the first direction X of the portion of the peripheral wall 12 that constitutes the second chamber 10b. A pair of clamps 70 described above are locked to each locking portion 19 . The locking portion 19 on the other side in the first direction X is provided in a portion of the peripheral wall 12 that constitutes the bulging portion 15 .

<Cap 30>
As shown in FIGS. 6 and 7 , the cap 30 has a second opening 31 facing the first opening 11 of the case 10 . The cap 30 also has a peripheral wall 32 surrounding the second opening 31 and a facing wall 33 facing the second opening 31 . A portion of the facing wall 33 faces the filter element 50 .

Inside the cap 30, a first chamber 30a facing the first chamber 10a of the case 10 and a second chamber 30b communicating with the first chamber 30a and facing the second chamber 10b of the case 10 are formed.

The first chamber 30 a constitutes a portion of the first body portion 111 on the downstream side of the filter element 50 . Also, the second chamber 30b constitutes a part of the second body portion 112 .
As described above, the first body portion 111 is composed of the first chamber 10 a of the case 10 and the first chamber 30 a of the cap 30 . The second body portion 112 is configured by the second chamber 10b of the case 10 and the second chamber 30b of the cap 30. As shown in FIG.

Inside the cap 30 , a beam portion 34 extends along the first direction X and connects portions of the peripheral wall 32 on both sides in the first direction X. As shown in FIG. The end face of the beam portion 34 is flush with the end face of the peripheral wall 32 . The beam portion 34 is provided facing the partition wall 14 of the case 10 .

The second opening 31 is composed of a main opening 31 a facing the main opening 11 a of the case 10 and a sub opening 31 b facing the sub opening 11 b of the case 10 . The main opening 31a and the sub-opening 31b are partitioned by the beam portion 34. As shown in FIG. The main opening 31a and the sub-opening 31b are formed adjacent to each other in the second direction Y. As shown in FIG.

A portion of the second chamber 30b on the other side in the first direction X is provided with a bulging portion 35 that bulges in the other side in the first direction X from the first chamber 30a. The bulging portion 35 forms part of the second folded portion 130 .

As described above, the second folded portion 130 has a bulging portion 131 formed by the bulging portion 15 of the case 10 and the bulging portion 35 of the cap 30. The bulging portion 131 bulges outward from the main body portion 110, that is, toward the other side in the first direction X.

The outlet 40 described above is connected to the portion on the other side in the second direction Y of the bulging portion 131 and extends along the second direction Y. As shown in FIG. A mounting seat 41 is provided on the outer surface of the outlet 40 on the other side in the first direction X. As shown in FIG.

As shown in FIGS. 1 to 3, the mounting seat 41 is attached with an air flow meter 80 for measuring the flow rate of intake air inside the outlet 40 .
As shown in FIGS. 7 and 8, the connecting portion between the bulging portion 131 and the outlet 40 is provided with a restricting wall 42 that separates the inside of the second folded portion 130 into an inner side near the body portion 110 and an outer side away from the body portion 110. The regulating wall 42 protrudes from the opposing wall 33 and extends over the entire connection portion in the third direction Z. As shown in FIG. The restricting wall 42 restricts the flow of intake air toward the outside away from the body portion 110 inside the second folded portion 130 .

A pair of straightening walls 43 extending in parallel is provided in the upstream portion of the outlet 40 . Each straightening wall 43 extends across the regulation wall 42 . The upstream edge of each rectifying wall 43 continues to the restricting wall 42 . Each straightening wall 43 is positioned on both sides of the airflow meter 80 in the third direction Z. As shown in FIG.

As shown in FIGS. 6 to 8, a first guide wall 44 protruding toward the inside of the body portion 110 is provided at a portion of the inner surface of the peripheral wall 32 that constitutes the body portion 110 and continues to the inside of the corner of the second folded portion 130. The first guide wall 44 extends along the third direction Z. As shown in FIG. One end of the first guide wall 44 in the third direction Z continues to the opposing wall 33 , and the other end continues to the beam portion 34 . The first guide wall 44 guides the intake air flowing from the first body portion 111 toward the second body portion 112 toward the side away from the second folded portion 130 .

The opposing wall 33 is provided with a second guide wall 45 protruding toward the inside of the main body portion 110 . The second guide wall 45 extends from the first folded portion 120 side of the opposing wall 33 toward the second folded portion 130 side. The second guide wall 45 of this embodiment extends along the first direction X. As shown in FIG. One end of the second guide wall 45 in the first direction X continues to the peripheral wall 32 , and the other end continues to the first guide wall 44 . The second guide wall 45 guides the intake air flowing from the first chamber 30 a side toward the second chamber 30 b side away from the opposing wall 33 .

The first guide wall 44 and the second guide wall 45 are provided between the first body portion 111 and the second body portion 112 .
The second guide wall 45 and the beam portion 34 are connected by a plurality of plate-like ribs 46 spaced apart from each other in the first direction X. As shown in FIG. In this embodiment, four ribs 46 are provided. The plate thickness direction of each rib 46 coincides with the first direction X. As shown in FIG.

On the other side of the second guide wall 45 in the first direction X, that is, on the side closer to the second folded portion 130, a guide promoting portion 47 that protrudes toward the inside of the main body portion 110 more than the other portion is provided. One end of the guide facilitating portion 47 in the first direction X continues to the rib 46 , and the other end continues to the first guide wall 44 . The guidance promoting portion 47 promotes the guidance of the intake air toward the side away from the opposing wall 33 .

A flange 36 is provided along the entire circumference of the peripheral edge of the second opening 31 in the peripheral wall 32 . A sealing surface 37 orthogonal to the third direction Z is formed by the flange 36 and the beam portion 34 . The sealing surface 37 has a B shape in plan view.

An outer wall 36 a protruding toward the case 10 is provided on the outer peripheral side of the flange 36 . The outer wall 36 a is provided on both sides of the case 10 in the first direction X and on one side in the second direction Y. As shown in FIG. More specifically, the outer wall 36a extends from the portion of the flange 36 on one side in the first direction X of the first chamber 30a to the middle of the portion on the other side in the first direction X so as to surround the second chamber 30b. Therefore, the outer wall 36a is not provided on the other side in the second direction Y. As shown in FIG. An inner wall 36b projecting toward the case 10 is provided along the entire circumference of the inner peripheral side of the portion of the sealing surface 37 surrounding the sub-opening 31b.

A pair of protrusions 38 that are inserted into the support portions 18 of the case 10 are provided on the outer surface of the peripheral wall 32 on the other side in the second direction Y at intervals in the first direction X. As shown in FIG. Each protrusion 38 protrudes to the other side in the second direction Y. As shown in FIG. Each support portion 18 and each protrusion 38 function as a hinge that supports the cap 30 with respect to the case 10 so as to be tiltable.

A pair of mounting portions 39 are provided on the outer surfaces of both sides in the first direction X of the portion of the peripheral wall 32 that constitutes the second chamber 30b. The above-described clamp 70 is attached to each attachment portion 39 . The mounting portion 39 on the other side in the first direction X is provided in a portion of the peripheral wall 32 that constitutes the bulging portion 35 .

<Filter element 50>
As shown in FIGS. 3 and 4, the filter element 50 has a filtering portion 51 for filtering intake air and a sealing portion 52 provided along the entire periphery of the filtering portion 51 . The filtering portion 51 is formed by pleating a nonwoven fabric. In this embodiment, the filtering portion 51 and the sealing portion 52 are integrally formed.

<Seal member 60>
As shown in FIGS. 3 and 4, a B-shaped seal member 60 in plan view is provided between the case 10 and the cap 30 to seal between them. The sealing member 60 is held between the sealing surface 17 of the case 10 and the sealing surface 37 of the cap 30 .

A slit 61 is formed along the entire circumference of the inner peripheral surface of a portion of the sealing member 60 surrounding the main opening 11a of the case 10 and the main opening 31a of the cap 30 . The filter element 50 is held by the seal member 60 by holding the seal portion 52 of the filter element 50 in the slit 61 over the entire circumference.

The operation of this embodiment will be described.
In the air cleaner of this embodiment, the intake air that has flowed from the inlet 20 into the first folded portion 120 is folded back into the main body portion 110 and passes through the filter element 50 . After passing through the filter element 50 , the intake air is folded again in the second folded portion 130 and flows out of the outlet 40 . Therefore, the intake air is folded twice between entering from the inlet 20 and exiting from the outlet 40 .

By the way, the intake air flowing through the first folded portion 120 tends to be unevenly distributed outside the corners of the first folded portion 120 . Therefore, as shown by a two-dot chain line arrow A in FIG. 8, the intake air flowing through the body portion 110 tends to be unevenly distributed near the portion of the body portion 110 that continues to the outside of the corner of the first folded portion 120, and the intake air flowing through the second folded portion 130 tends to be unevenly distributed outside the corner of the second folded portion 130.

According to the air cleaner of the present embodiment, the first guide wall 44 is provided on the inner surface of the main body portion 110 that continues to the inner side of the corner of the second folded portion 130 . Therefore, as shown by the solid arrow B in FIG. 8, the intake air flowing in the vicinity of the portion connecting to the inner side of the corner of the second folded portion 130 in the main body portion 110 is guided away from the second folded portion 130 by the first guide wall 44. As a result, compared to a configuration that does not have the first guide wall 44, the angle at which the intake air flows into the second folded portion 130 becomes smaller. An arrow A indicated by a chain double-dashed line in the figure schematically represents the flow of intake air into the second folded portion 130 in an air cleaner that does not have the first guide wall 44 (the above is action 1).

Also, the intake air that has flowed into the clean chamber C through the filter element 50 flows toward the opposing wall 33 that faces the filter element 50 due to inertia. Therefore, the intake air flowing through the body portion 110 tends to be unevenly distributed in the vicinity of the opposing wall 33 . This is one of the reasons why the intake air flowing through the second folded portion 130 tends to be unevenly distributed outside the corner of the second folded portion 130 .

In this respect, according to the air cleaner of the present embodiment, as indicated by the arrow in FIG. 9, the intake air flowing in the vicinity of the facing wall 33 in the main body portion 110 is guided away from the facing wall 33 by the second guide wall 45. Therefore, it is possible to prevent the intake air flowing through the body portion 110 from being unevenly distributed in the vicinity of the opposing wall 33 (operation 2).

By the way, if the amount of protrusion of the second guide wall 45 from the opposing wall 33 is uniformly increased in its extending direction, that is, the entire first direction X, the intake air can be effectively separated from the opposing wall 33, but the pressure loss of the intake air may increase.

According to the air cleaner of this embodiment, the guide promoting portion 47 projecting toward the inside of the main body portion 110 is provided in the portion of the second guide wall 45 on the side closer to the second folded portion 130 . Of the intake air flowing apart from the opposing wall 33 in the body portion 110 , the closer the intake air is to the second folded portion 130 , the easier it is to flow into the second folded portion 130 while being spaced apart from the opposing wall 33 . Therefore, as shown by the arrows in FIG. 10, the intake air flowing through the main body portion 110 on the side closer to the second folded portion 130 is largely separated from the opposing wall 33 by providing the guide promoting portion 47, thereby effectively suppressing uneven distribution of the intake air flowing through the outlet 40. On the other hand, for the intake air flowing through the main body portion 110 and flowing on the side closer to the first folded portion 120, an increase in the pressure loss of the intake air caused by increasing the amount of projection of the second guide wall 45 can be suppressed by not providing the guide promoting portion 47 (the above, action 3).

Effects of the present embodiment will be described.
(1) The housing 100 has a main body portion 110 that accommodates the filter element 50, and a first folded portion 120 and a second folded portion 130 that are provided on both sides of the main body portion 110 and folded back toward each other. The first folded portion 120 has an inlet 20 and the second folded portion 130 has an outlet 40 . A first guide wall 44 that protrudes toward the inside of the main body part 110 and guides the intake air away from the second folded part 130 is provided on the inner surface of the main body part 110 that continues to the inner side of the corner of the second folded part 130. - 特許庁

According to such a configuration, the uneven distribution of the intake air flowing through the outlet 40 can be suppressed because the above-described effect 1 is achieved.
(2) The main body portion 110 includes a first main body portion 111 that accommodates the filter element 50 and to which the first folded portion 120 is connected, and a second main body portion 112 that is positioned between the first main body portion 111 and the second folded portion 130 and to which the second folded portion 130 is connected. The second main body portion 112 is provided side by side with the first main body portion 111 in the plane direction including the peripheral edge of the filter element 50 . The first folded portion 120 is folded back toward the second main body portion 112 , and the second folded portion 130 is folded back toward the first main body portion 111 .

According to such a configuration, the intake air that has flowed into the first folded portion 120 from the inlet 20 is folded back and flows into the first main body portion 111 and passes through the filter element 50 . Also, the intake air that has passed through the filter element 50 flows into the second main body portion 112 provided side by side with the first main body portion 111 . Then, when it flows into the second folded portion 130 connected to the second body portion 112 , it is folded back again and flows out of the outlet 40 .

According to the above configuration, the main body portion 110 has the first main body portion 111 and the second main body portion 112 provided side by side with the first main body portion 111 in the plane direction, so that the volume of the housing 100 can be secured and the size of the housing 100 in the thickness direction of the filter element 50, that is, in the third direction Z can be reduced.

(3) The opposing wall 33 is provided with a second guide wall 45 that protrudes toward the inside of the main body 110 and guides the intake air away from the opposing wall 33 .
According to such a configuration, since the above-described effect 2 is achieved, it is possible to suppress uneven distribution of the intake air flowing inside the second folded portion 130 to the outside of the corner of the second folded portion 130 .

(4) The second guide wall 45 extends from the first folded portion 120 side of the opposing wall 33 toward the second folded portion 130 side. A part of the second guide wall 45 on the side closer to the second folded part 130 is provided with a guide promoting part 47 that protrudes toward the inside of the main body part 110 more than the other part and promotes the guidance of the intake air toward the side away from the opposing wall 33. - 特許庁

With such a configuration, since the above-described effect 3 is achieved, it is possible to achieve both suppression of uneven distribution of the intake air flowing through the outlet 40 and suppression of an increase in the pressure loss of the intake air.

(5) The second folded portion 130 has a bulging portion 131 bulging outward from the body portion 110 and the outlet 40 connected to the bulging portion 131 . A connecting portion between the bulging portion 131 and the outlet 40 is provided with a regulating wall 42 that separates the inside of the second folded portion 130 into an inner side close to the main body portion 110 and an outer side remote from the main body portion 110, and regulates the flow of intake air toward the outer side.

According to such a configuration, of the intake air flowing toward the outlet 40 within the second folded portion 130 , the flow of the intake air toward the outside away from the main body portion 110 inside the second folded portion 130 is restricted by the restriction wall 42 . As a result, the uneven distribution of the intake air flowing through the outlet 40 to the outside can be further suppressed.

<Change example>
This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

- The regulation wall 42 can be omitted.
- The rectification wall 43 can also be omitted.
- The guidance promotion unit 47 can be omitted.

- The second guide wall 45 may extend obliquely with respect to the first direction X.
- One end of the second guide wall 45 in the first direction X does not have to be continuous with the peripheral wall 32 . Also, the other end of the second guide wall 45 in the first direction X does not have to be continuous with the first guide wall 44 .

- A plurality of second guide walls 45 may be provided in the second direction Y.
- The second guide wall 45 can be omitted.
- The first guide wall 44 and the second guide wall 45 can be provided at different positions in the second direction Y.

- It is also possible to omit the second main body portion 112 and connect the second folded portion 130 to the portion on the downstream side of the first main body portion 111 . Even in this case, if the first guide wall 44 is provided on the portion of the inner surface of the main body 110 that continues to the inner side of the corner of the second folded portion 130, the same effect as the above effect (1) can be achieved.

C... Clean room D... Dusty room 20... Inlet 33... Opposite wall 40... Outlet 42... Regulating wall 44... First guide wall 45... Second guide wall 47... Guidance promotion part 50... Filter element 100... Housing 110... Main body part 111... First main body part 112... Second main body part 120... First folded part 130... Second folded part 131... Swelling part

Claims (5)

An air cleaner comprising: a housing having an inlet and an outlet; and a filter element housed inside the housing for filtering intake air and dividing the inside of the housing into a dust chamber communicating with the inlet and a clean chamber communicating with the outlet,
The housing has a main body portion that accommodates the filter element, and a first folded portion and a second folded portion that are provided on both sides of the main body portion and extend by being folded back toward each other,
The first folded portion has the inlet,
The second folded portion has the outlet,
A guide wall that protrudes toward the inside of the main body and guides the intake air away from the second folded portion is provided in a portion of the inner surface of the main body that is continuous with the inner side of the corner of the second folded portion .
The second folded portion has a bulging portion that bulges outward from the body portion, and the outlet connected to the bulging portion,
At the connecting portion between the bulging portion and the outlet, the inside of the second folded portion is separated into an inner side near the main body portion and an outer side away from the main body portion, and a restriction wall is provided to restrict the flow of intake air toward the outer side.
air cleaner. An air cleaner comprising: a housing having an inlet and an outlet; and a filter element housed inside the housing for filtering intake air and dividing the inside of the housing into a dust chamber communicating with the inlet and a clean chamber communicating with the outlet,
The housing has a main body portion that accommodates the filter element, and a first folded portion and a second folded portion that are provided on both sides of the main body portion and extend by being folded back toward each other,
The first folded portion has the inlet,
The second folded portion has the outlet,
A guide wall that protrudes toward the inside of the main body and guides the intake air away from the second folded portion is provided in a portion of the inner surface of the main body that is continuous with the inner side of the corner of the second folded portion .
The main body portion includes a first main body portion that accommodates the filter element and to which the first folded portion is connected, and a second main body portion that is positioned between the first main body portion and the second folded portion and to which the second folded portion is connected,
The second main body is provided side by side with the first main body in a plane direction including the peripheral edge of the filter element,
The first folded portion is folded back toward the second body portion,
The second folded portion is folded back toward the first main body,
air cleaner. When the guide wall is the first guide wall,
the main body has a facing wall facing the filter element and forming the clean room;
The opposing wall is provided with a second guide wall that protrudes toward the inside of the main body and guides the intake air away from the opposing wall.
An air cleaner according to claim 2. The second guide wall extends from the first folded portion side of the opposing wall toward the second folded portion side,
A portion of the second guide wall on the side closer to the second folded portion protrudes toward the inside of the main body portion than the other portion, and a guide promoting portion that promotes guidance of the intake air toward the side away from the opposing wall is provided.
An air cleaner according to claim 3. The second folded portion has a bulging portion that bulges outward from the body portion, and the outlet connected to the bulging portion,
At the connecting portion between the bulging portion and the outlet, the inside of the second folded portion is separated into an inner side near the main body portion and an outer side away from the main body portion, and a restriction wall is provided to restrict the flow of intake air toward the outer side.
The air cleaner according to any one of Claims 2 to 4.