JP2021092152A - Air cleaner - Google Patents

Abstract

To provide an air cleaner which can suppress an uneven distribution of intake air which flows in an outlet.SOLUTION: A housing 100 has a main body 110 for accommodating a filter element 50, and a first folding part 120 and a second folding part 130 which are arranged with the main body part 110 sandwiched therebetween, and extend while being folded to a side at which they approach each other. The first folding part 120 has an inlet 20, and the second folding part 130 has an outlet 40. A first guide part 44 protruding toward the inside of the main body part 110, and guiding intake air toward a side at which the guide wall separates from the second folding part 130 is disposed at a portion which is continued to the inside of a corner of the second folding part 130 out of an inner face of the main body part 110.SELECTED DRAWING: Figure 8

Description

The present invention relates to an air cleaner.

Conventionally, an air cleaner for filtering intake air is provided in an intake passage of an internal combustion engine (see, for example, Patent Document 1). 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 divided into an air introduction chamber and an air outlet chamber by a partition wall.
The air introduction chamber and the air outlet chamber communicate with an air inlet for introducing air into the air inlet chamber and an air outlet for guiding air from 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 to seal between them.
A filter element is provided between the lower housing and the upper housing so as to close the upper opening of the air introduction chamber. Therefore, the portion of the internal space of the upper housing 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, the intake air introduced from the air introduction port into the air introduction 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 chamber, that is, the inside of the upper housing and the inside of the lower housing, and is discharged from the air outlet.

Japanese Unexamined Patent Publication 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 air cleaner, the intake air introduced from the air introduction port meanders in the air introduction chamber and the air outlet chamber and is discharged from the outlet. Therefore, the intake air flowing in 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 variations in the measured values of the air flow meter may occur.

An object of the present invention is to provide an air cleaner capable of suppressing uneven distribution of intake air flowing in an outlet.

The air cleaner for achieving the above object includes a housing having an inlet and an outlet, a dusty chamber which is housed inside the housing and filters intake air, and a dusty chamber which connects the inside of the housing to the inlet and a clean chamber which connects to the outlet. The housing is an air cleaner including a filter element for partitioning the filter element, and the housing is provided with the main body portion for accommodating the filter element and the main body portion interposed therebetween, and is folded back toward each other and extends. It has a portion and a second folded portion, the first folded portion has the inlet, the second folded portion has the outlet, and the second of the inner surfaces of the main body portion. A guide wall that projects toward the inside of the main body and guides the intake air toward the side away from the second folded portion is provided at a portion that is connected to the inside of the corner of the folded portion.

According to the same configuration, the first folded-back portion and the second folded-back portion having the inlet and the outlet, respectively, are provided so as to sandwich the main body portion of the housing, and are folded back toward each other and extend. In such an air cleaner, the intake air that has flowed into the first folded portion from the inlet is folded back and flows into the main body portion and passes through the filter element. Then, the intake air that has passed through the filter element flows out from the outlet by being folded back and flowing in the second folded portion. Therefore, the intake air is folded back twice before flowing in from the inlet and out of the outlet.

By the way, the intake air flowing in the first folded portion tends to be unevenly distributed outside the corner of the first folded portion. Therefore, the intake air flowing in the main body portion tends to be unevenly distributed in the vicinity of the portion of the main body portion that is connected to the outside of the corner of the first folded portion, and the intake air flowing in the second folded portion is in the corner of the second folded portion. It tends to be unevenly distributed on the outside.

According to the above configuration, a guide wall is provided on the inner surface of the main body portion that is connected to the inside of the corner of the second folded portion. Therefore, in the main body portion, the intake air flowing in the vicinity of the portion connected to the inside of the corner of the second folded portion is guided by the guide wall toward the side away from the second folded portion. As a result, the inflow angle of the intake air into the second folding portion becomes smaller than that of the configuration without the guide wall. Therefore, it is possible to suppress the uneven distribution of the intake air flowing in the outlet.

The perspective view of the air cleaner in one embodiment. The plan view of the air cleaner of the same embodiment. An exploded perspective view of the air cleaner of the same embodiment. FIG. 2 is a cross-sectional view taken along the line 4-4 of FIG. The perspective view which shows by breaking a part of the case of the same embodiment. The perspective view of the cap of the same embodiment. A perspective view of the cap of the same embodiment as viewed from a direction different from that of FIG. It is a figure which shows typically the flow of the intake air in the air cleaner of the same embodiment, and is the sectional view of the air cleaner which shows by breaking a part of the cap. The cross-sectional view which shows typically the flow of the intake air guided by the 2nd guide wall inside the air cleaner of the same embodiment. The cross-sectional view which shows typically the flow of the intake air guided by the guidance promotion part in the air cleaner of the same embodiment.

Hereinafter, an embodiment of the air cleaner will be described with reference to FIGS. 1 to 10.
<Overall configuration of air cleaner>
The air cleaner of the present embodiment is provided in the intake passage of an in-vehicle internal combustion engine and filters the intake air.

As shown in FIGS. 1 to 4, the air cleaner is housed in a housing 100 having a tubular inlet 20 and a tubular outlet 40, and inside the housing 100 to filter intake air and a dusty chamber inside the housing 100. A filter element 50 for partitioning D and a clean chamber C is provided. 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 a long side and a short side in a 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 both in the first direction X and the second direction Y. The direction orthogonal to each other is referred to as a third direction Z. Further, the right side and the left side in FIG. 2 are one side of the first direction X and the other side of the first direction X, respectively, and the upper side and the lower side in the figure are one side of the second direction Y and the other side of the second direction Y, respectively. Explain as the side. Further, the upper side and the lower side in FIG. 1 will be described as one side of the third direction Z and the other side of the third direction Z, respectively. Further, the upstream side and the downstream side in the flow direction of the 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 is provided with the main body 110 accommodating the filter element 50 and the main body 110 sandwiched in the first direction X, and the first folded portion 120 and the second folded portion 130 that are folded and extend toward the side approaching each other. And have.

The main body 110 has a first main body 111 to which the first folded portion 120 is connected, and a second main body 112 provided alongside the first main body 111 in the surface direction including the peripheral edge of the filter element 50. doing. In the present embodiment, the first main body portion 111 and the second main body portion 112 are provided side by side in the second direction Y.

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

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

The housing 100 of such an air cleaner includes 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. 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 engaging 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 of the third direction Z. Further, the case 10 has a peripheral wall 12 surrounding the first opening 11 and a bottom wall 13 facing the first opening 11.

Inside the case 10, a partition wall 14 that protrudes from the inner surface of the bottom wall 13 and extends along the first direction X is provided. The partition wall 14 is connected to the inner surface of the peripheral wall 12 on both sides of the first direction X. The end face of the partition wall 14 is provided flush with the end face of the peripheral wall 12. The inside of the case 10 is divided into a first chamber 10a and a second chamber 10b by a partition wall 14.

The first opening 11 is composed of a main opening 11a that opens into the first chamber 10a and a sub-opening 11b that opens 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. 4, the filter element 50 is arranged so as to cover the main opening 11a. Therefore, the first chamber 10a constitutes a portion of the first main body 111 on the upstream side of the filter element 50. Further, the second chamber 10b constitutes a part of the second main body portion 112.

As shown in FIG. 5, the first folded-back portion 120 described above is connected to the first chamber 10a. The first folded-back portion 120 protrudes from one side of the first direction X in the first chamber 10a and is bent toward the second chamber 10b. The first folded-back portion 120 projects from the second chamber 10b to one side of the first direction X. The first folded-back 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 of the second direction Y. The inlet 20 extends so as to be inclined with respect to the second direction Y so as to be farther from the main body 110 toward the tip end side. Further, the inlet 20 extends so as to be inclined with respect to the second direction Y so as to be separated from the bottom wall 13 toward the tip end side. Therefore, the inlet 20 is inclined with respect to the second direction Y so as to be located on one side of the first direction X and on one side of the third direction Z toward the tip end side.

As shown in FIG. 4, the first chamber 10a is formed so that the depth in the third direction Z is deeper than that of the second chamber 10b. That is, the portion of the bottom wall 13 that constitutes the bottom of the second chamber 10b is located on one side of the third direction Z with respect to the portion that constitutes the bottom of the first chamber 10a.

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

A flange 16 is provided on the periphery of the first opening 11 in the peripheral wall 12 over the entire circumference. A sealing 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 a plan view.

On the outer peripheral side of the flange 16, an outer wall 16a projecting toward the cap 30 is provided over the entire circumference. On the inner peripheral side of the portion of the sealing surface 17 that surrounds the sub-opening 11b, an inner wall 16b projecting toward the cap 30 is provided over the entire circumference. The outer wall 16a and the inner wall 16b face each other.

On the outer surface of the peripheral wall 12 on the other side of the second direction Y, a pair of gate-shaped support portions 18 are provided at intervals in the first direction X. Each support portion 18 projects to one side of the third direction Z.

A pair of locking portions 19 are provided on the outer surfaces on both sides of the first direction X in the portion of the peripheral wall 12 that constitutes the second chamber 10b. The pair of clamps 70 described above are locked to each locking portion 19. The locking portion 19 on the other side of 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. Further, the cap 30 has a peripheral wall 32 surrounding the second opening 31 and an opposing wall 33 facing the second opening 31. A part 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. There is.

The first chamber 30a constitutes a portion of the first main body 111 on the downstream side of the filter element 50. Further, the second chamber 30b constitutes a part of the second main body portion 112.
From the above, the first main body 111 is composed of the first chamber 10a of the case 10 and the first chamber 30a of the cap 30. Further, the second main body portion 112 is composed of a second chamber 10b of the case 10 and a second chamber 30b of the cap 30.

Inside the cap 30, a beam portion 34 connecting both side portions of the peripheral wall 32 in the first direction X extends along the first direction X. The end face of the beam portion 34 is provided flush with the end face of the peripheral wall 32. The beam portion 34 is provided so as to face the partition wall 14 of the case 10.

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

In the portion of the second chamber 30b on the other side of the first direction X, a bulging portion 35 bulging on the other side of the first direction X from the first chamber 30a is provided in a row. The bulging portion 35 forms a part of the second folded portion 130.

From the above, the second folded-back portion 130 has a bulging portion 131 composed of a bulging portion 15 of the case 10 and a bulging portion 35 of the cap 30, and the bulging portion 131 is a main body portion. It bulges outward from 110, that is, toward the other side of the first direction X.

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

As shown in FIGS. 1 to 3, an air flow meter 80 for measuring the flow rate of intake air inside the outlet 40 is attached to the mounting seat 41.
As shown in FIGS. 7 and 8, the connection portion between the bulging portion 131 and the outlet 40 is regulated to separate the inside of the second folded portion 130 into the inside close to the main body 110 and the outside away from the main body 110. A wall 42 is provided. The regulating wall 42 projects from the facing wall 33 and extends over the entire connecting portion in the third direction Z. The regulation wall 42 regulates the flow of intake air toward the outside away from the main body 110 inside the second folded-back portion 130.

A pair of rectifying walls 43 extending in parallel are provided on the upstream side portion inside the outlet 40. Each rectifying wall 43 extends across the regulatory wall 42. The upstream edge of each rectifying wall 43 is connected to the regulating wall 42. Each rectifying wall 43 is located on both sides of the air flow meter 80 in the third direction Z.

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

The facing wall 33 is provided with a second guide wall 45 that projects inward of the main body 110. The second guide wall 45 extends from the first folded portion 120 side to the second folded portion 130 side of the facing wall 33. The second guide wall 45 of the present embodiment extends along the first direction X. One end of the second guide wall 45 in the first direction X is connected to the peripheral wall 32, and the other end is connected to the first guide wall 44. The second guide wall 45 guides the intake air flowing from the first chamber 30a side toward the second chamber 30b side toward the side away from the facing wall 33.

The first guide wall 44 and the second guide wall 45 are provided between the first main body portion 111 and the second main body portion 112.
The second guide wall 45 and the beam portion 34 are connected by a plurality of plate-shaped ribs 46 provided at intervals in the first direction X. In this embodiment, four ribs 46 are provided. The plate thickness direction of each rib 46 coincides with the first direction X.

On the other side of the second guide wall 45 in the first direction X, that is, the side closer to the second folded-back portion 130, a guide promoting portion 47 is provided so as to project toward the inside of the main body portion 110 more than the other portions. Has been done. One end of the guidance promoting portion 47 in the first direction X is connected to the rib 46, and the other end is connected to the first guide wall 44. The guidance promotion unit 47 promotes the guidance of the intake air toward the side away from the facing wall 33.

A flange 36 is provided on the periphery of the second opening 31 in the peripheral wall 32 over the entire circumference. 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 a plan view.

An outer wall 36a projecting toward the case 10 is provided on the outer peripheral side of the flange 36. The outer wall 36a is provided on both side portions of the case 10 in the first direction X and one side portion in the second direction Y. More specifically, the outer wall 36a extends from one side of the first chamber 30a of the flange 36 to the middle of the other side of the first direction X so as to surround the second chamber 30b. ing. Therefore, the outer wall 36a is not provided on the other side of the second direction Y. On the inner peripheral side of the portion of the sealing surface 37 that surrounds the sub-opening 31b, an inner wall 36b projecting toward the case 10 is provided over the entire circumference.

On the outer surface of the peripheral wall 32 on the other side of the second direction Y, a pair of protrusions 38 inserted into the support portions 18 of the case 10 are provided at intervals in the first direction X. Each protrusion 38 projects to the other side of the second direction Y. Each support portion 18 and each protrusion 38 functions as a hinge that tiltably supports the cap 30 with respect to the case 10.

A pair of mounting portions 39 are provided on the outer surfaces on both sides of the first direction X in the portion of the peripheral wall 32 that constitutes the second chamber 30b. The clamp 70 described above is attached to each attachment portion 39. The mounting portion 39 on the other side of 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 filtration unit 51 for filtering the intake air and a seal portion 52 provided over the entire circumference of the peripheral edge of the filtration unit 51. The filtration unit 51 is formed by folding a non-woven fabric. In the present embodiment, the filtration portion 51 and the seal portion 52 are integrally formed.

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

A slit 61 is formed on the inner peripheral surface of the portion of the seal member 60 that surrounds 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 sandwiching 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 the present embodiment, the intake air that has flowed from the inlet 20 into the first folded portion 120 is folded back and flows into the main body portion 110 and passes through the filter element 50. Then, the intake air that has passed through the filter element 50 is folded back and flows in the second folded-back portion 130, so that the intake air flows out from the outlet 40. Therefore, the intake air is folded back twice before flowing in from the inlet 20 and flowing out from the outlet 40.

By the way, the intake air flowing in the first folded-back portion 120 tends to be unevenly distributed outside the corner of the first folded-back portion 120. Therefore, as shown by the arrow A of the alternate long and short dash line in FIG. 8, the intake air flowing in the main body 110 tends to be unevenly distributed in the vicinity of the portion of the main body 110 that is connected to the outside of the corner of the first folded portion 120. Therefore, the intake air flowing in the second folded-back portion 130 tends to be unevenly distributed outside the corner of the second folded-back 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 110 that is connected to the inside 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 connected to the inside of the corner of the second folded portion 130 in the main body portion 110 is second folded by the first guide wall 44. The guide will be directed toward the side away from the portion 130. As a result, the inflow angle of the intake air into the second folded-back portion 130 becomes smaller than that of the configuration without the first guide wall 44. The arrow A indicated by the alternate long and short dash line in the figure schematically represents the flow of intake air into the second folded-back portion 130 in the air cleaner that does not have the first guide wall 44 (the above, action 1). ).

Further, the intake air that has passed through the filter element 50 and has flowed into the clean chamber C flows toward the facing wall 33 facing the filter element 50 due to inertia. Therefore, the intake air flowing in the main body 110 tends to be unevenly distributed in the vicinity of the facing wall 33. This is one of the factors that make it easy for the intake air flowing in the second folded-back portion 130 to be unevenly distributed outside the corner of the second folded-back portion 130.

In this regard, according to the air cleaner of the present embodiment, as shown by an arrow in FIG. 9, the intake air flowing in the vicinity of the facing wall 33 in the main body 110 is separated from the facing wall 33 by the second guide wall 45. Will be guided towards. Therefore, it is possible to prevent the intake air flowing in the main body 110 from being unevenly distributed in the vicinity of the facing wall 33 (the above is the action 2).

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

According to the air cleaner of the present embodiment, a guide promoting portion 47 projecting inward of the main body portion 110 is provided on a portion of the second guide wall 45 on the side closer to the second folded portion 130. Of the intake air that flows away from the facing wall 33 in the main body 110, the intake air that flows closer to the second folded-back portion 130 is more likely to flow into the second folded-back portion 130 while being separated from the facing wall 33. Therefore, as shown by an arrow in FIG. 10, the intake air flowing in the main body 110 that flows closer to the second folded-back portion 130 is largely separated from the facing wall 33 by providing the guidance promoting portion 47. By doing so, it is possible to effectively suppress the uneven distribution of the intake air flowing in the outlet 40. On the other hand, of the intake air flowing in the main body 110, the intake air flowing on the side closer to the first folding portion 120 is the pressure of the intake air by increasing the protrusion amount of the second guide wall 45 by not providing the guide promotion portion 47. The increase in loss can be suppressed (above, action 3).

The effect of this embodiment will be described.
(1) The housing 100 includes a main body portion 110 that houses the filter element 50, and a first folded-back portion 120 and a second folded-back portion 130 that are provided with the main body portion 110 interposed therebetween and are folded back and extend toward the side approaching each other. Have. The first folded-back portion 120 has an inlet 20, and the second folded-back portion 130 has an outlet 40. The portion of the inner surface of the main body 110 that is connected to the inside of the corner of the second folded portion 130 projects toward the inside of the main body 110 and guides the intake air toward the side away from the second folded portion 130. A first guide wall 44 is provided.

According to such a configuration, since the above-mentioned action 1 is performed, it is possible to suppress the uneven distribution of the intake air flowing in the outlet 40.
(2) The main body 110 is located between the first main body 111 that accommodates the filter element 50 and to which the first folded portion 120 is connected, and the first main body 111 and the second folded portion 130, and is second. It has a second main body portion 112 to which the two folded portions 130 are connected. The second main body 112 is provided alongside the first main body 111 in the surface direction including the peripheral edge of the filter element 50. The first folded-back portion 120 is folded back toward the second main body portion 112, and the second folded-back 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-back 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. Further, the intake air that has passed through the filter element 50 flows into the second main body portion 112 provided alongside the first main body portion 111. Then, when it flows into the second folded-back portion 130 connected to the second main body portion 112, it is folded back again and flows out from the outlet 40.

According to the above configuration, since the main body 110 has the first main body 111 and the second main body 112 provided side by side with the first main body 111 in the surface direction, the volume of the housing 100 is secured. At the same time, the body shape 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 facing wall 33 is provided with a second guide wall 45 that projects toward the inside of the main body 110 and guides the intake air toward the side away from the facing wall 33.
According to such a configuration, since the above-described action 2 is performed, it is possible to prevent the intake air flowing in the second folded-back portion 130 from being unevenly distributed outside the corner of the second folded-back portion 130.

(4) The second guide wall 45 extends from the first folded portion 120 side to the second folded portion 130 side of the facing wall 33. The portion of the second guide wall 45 on the side closer to the second folded portion 130 protrudes toward the inside of the main body portion 110 than the other portions and promotes the guidance of intake air toward the side away from the facing wall 33. A guidance promotion unit 47 is provided.

According to such a configuration, since the above-described action 3 is performed, it is possible to suppress the uneven distribution of the intake air flowing in the outlet 40 and to suppress the increase in the pressure loss of the intake air.

(5) The second folded-back portion 130 has a bulging portion 131 that bulges outward from the main body portion 110, and an outlet 40 that is connected to the bulging portion 131. At the connecting portion between the bulging portion 131 and the outlet 40, the inside of the second folded portion 130 is separated into an inside close to the main body 110 and an outside away from the main body 110, and the flow of intake air toward the outside is regulated. A regulation wall 42 is provided.

According to such a configuration, of the intake air flowing toward the outlet 40 in the second folding portion 130, the flow of the intake air in the inside of the second folding portion 130 away from the main body 110 is regulated by the regulation wall 42. To. Thereby, it is possible to further suppress that the intake air flowing in the outlet 40 is unevenly distributed to the outside.

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

-The regulation wall 42 may be omitted.
-The rectifying wall 43 may be omitted.
-The guidance promotion unit 47 may be omitted.

The second guide wall 45 may be inclined and extend 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 connected to the peripheral wall 32. Further, the other end of the second guide wall 45 in the first direction X does not have to be connected to the first guide wall 44.

-It is also possible to provide a plurality of second guide walls 45 in the second direction Y.
-The second guide wall 45 may be omitted.
The first guide wall 44 and the second guide wall 45 may 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 a 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 inner surface of the main body 110 that is connected to the inside of the corner of the second folded portion 130, an effect similar to the above effect (1) can be obtained. be able to.

C ... Clean room D ... Dusty room 20 ... Inlet 33 ... Opposing wall 40 ... Outlet 42 ... Regulatory wall 44 ... 1st guide wall 45 ... 2nd guide wall 47 ... Guidance promotion unit 50 ... Filter element 100 ... Housing 110 ... Main body 111 ... 1st main body 112 ... 2nd main body 120 ... 1st folded part 130 ... 2nd folded part 131 ... Swelling part

Claims (5)

An air cleaner including a housing having an inlet and an outlet, and a filter element housed inside the housing, which filters intake air and divides the inside of the housing into a dusty chamber connected to the inlet and a clean chamber connected to the outlet. And
The housing has a main body portion for accommodating the filter element, and a first folded-back portion and a second folded-back portion which are provided so as to sandwich the main body portion and which are folded back toward each other and extend.
The first folded portion has the inlet and
The second folded portion has the outlet.
The portion of the inner surface of the main body that is continuous with the inside of the corner of the second folded portion projects toward the inside of the main body and guides the intake air toward the side away from the second folded portion. There is a guide wall to
Air cleaner. The main body portion is located between a first main body portion that accommodates the filter element and is connected to the first folded portion, and the first main body portion and the second folded portion, and the second folded portion. Has a second main body to which is connected,
The second main body is provided alongside the first main body in the surface direction including the peripheral edge of the filter element.
The first folded portion is folded toward the second main body portion, and the first folded portion is folded toward the second main body portion.
The second folded portion is folded toward the first main body portion.
The air cleaner according to claim 1. When the guide wall is used as the first guide wall,
The main body has an facing wall that faces the filter element and forms the clean chamber.
The facing wall is provided with a second guide wall that projects toward the inside of the main body and guides the intake air toward a side away from the facing wall.
The air cleaner according to claim 2. The second guide wall extends from the first folded portion side of the facing wall toward the second folded portion side.
The portion of the second guide wall on the side closer to the second folded portion is provided with the intake guide that protrudes toward the inside of the main body portion rather than the other portions and toward the side away from the facing wall. There is a guidance promotion department to promote,
The air cleaner according to claim 3. The second folded-back portion has a bulging portion that bulges outward from the main body portion and the outlet that is 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 inside close to the main body portion and an outside separated from the main body portion, and the flow of intake air toward the outside is regulated. There is a regulatory wall to
The air cleaner according to any one of claims 1 to 4.

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