JP2015121128A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner which expands a region in which a filter element can collect dust.SOLUTION: An air cleaner 1 includes: a case body 2; a filter element 4; a cover 6; and an undercover 50. At a case body bottom surface 8, a V-shaped guide wall 30 is erected. At the bottom surface 8, a dust collection hole 40 is opened in an inside region of the guide wall 30, and a communication port 42 is opened at a downstream of the dust collection hole 40. At an undercover bottom surface 51, a dust discharge hole 54 is opened. Air which flows in a dust side chamber 10 collides with the guide wall 30, becomes a split flow, passes through the filter element 4 and the dust is collected. The dust staying in the vicinity of the case body bottom surface 8 without being collected is guided to the inside region of the guide wall 30 by an airflow, passes through the dust collection hole 40 and falls in a dust collection chamber 52, and it is discharged to the outside of the air cleaner 1 via an evacuator valve 58.

Description

  The present invention relates to an air cleaner used for an automobile engine, for example.

  For example, as an air cleaner used for an automobile engine, a configuration in which a rectangular filter element is disposed between a case main body and a cover as described in Patent Document 1 is known. In the air cleaner of Patent Document 1, an intake intake is provided in the case body on one end side in the longitudinal direction of the filter element, and an intake outlet is provided in the cover on the other end side. A dust exhaust valve for discharging dust is attached to the bottom of the case body. In the air cleaner thus configured, intake air flows across the filter element from the intake port to the intake port, and dust in the intake air is collected by the filter element. Part of the dust is discharged out of the filter element via the dust discharge valve during engine operation.

JP 2005-330826 A

  In an air cleaner using a rectangular filter element, generally, as disclosed in Patent Document 1, an intake air inlet and an intake air outlet are arranged at positions separated from each other along the longitudinal direction of the filter element. In such a case, the intake air flows relatively linearly from the intake inlet to the intake outlet, so that dust collection is mainly downstream of the filter element. There is a tendency to be performed in the side region (region close to the intake outlet). That is, the area of the filter element that actually collects dust is limited. Therefore, the downstream portion of the filter element is clogged immediately, and the dust collecting performance of the entire filter element is deteriorated, and the filter element has to be cleaned or replaced relatively early.

  Moreover, although patent document 1 is equipped with the dust removal valve for discharging | emitting a dust in a case bottom part, the dust deposited on the case bottom part rises again on the flow of intake air, and it is easy to adhere to a filter element.

  An air cleaner according to the present invention includes a case main body having an upper surface opened, a filter element detachably attached to the upper surface opening of the case main body, and a cover attached to cover the filter element. A dust side chamber is defined between the bottom surface of the case body and the filter element, and a clean side chamber is defined between the cover and the filter element. An intake intake port is opened in the side wall of the case body, and an intake outlet is opened in the cover. A guide wall is erected on the bottom surface of the case body so that the apex portion faces the intake intake, and a dust collection hole is formed in the bottom surface of the case body in the inner region of the guide wall. . An under cover is attached to the bottom of the case body so as to cover the dust collection hole so as to form a dust collection chamber.

  In this way, by providing the V-shaped guide wall so as to face the intake port, the inflowing air collides with the guide wall and rises while being diverted to the left and right along the guide wall. The flow is also guided to the upstream area, and collection is performed in a wide range. Here, a part of the dust gathers in the inner region of the V-shaped guide wall and falls into the dust collection chamber through the dust collection hole.

  In one preferred embodiment, the opening area is smaller than the dust collection hole, and a communication port that communicates the dust side chamber and the dust collection chamber is formed in the bottom surface of the case body.

  In such a configuration, since the dust collection chamber communicates with the dust side chamber at two locations, that is, the dust collection hole and the communication port, air flow can be effectively obtained between the two. Therefore, the fall of the dust through the dust collection hole is promoted.

  In another preferred embodiment, a vacuator valve is attached to the bottom surface of the under cover.

  In such a configuration, dust collected in the dust collection chamber without being collected by the filter element is discharged to the outside of the air cleaner through the vacuator valve.

  According to the present invention, the dust collection area of the filter element can be expanded, and part of the dust is collected without adhering to the filter element. The collecting ability can be maintained, and the service life of the filter element can be extended.

Sectional drawing of the air cleaner which concerns on this invention. The disassembled perspective view of the air cleaner of FIG. The top view of the case main body of the air cleaner of FIG. The graph which shows the acoustic performance characteristic which compared the transmission loss (TL) in the air cleaner of this invention with the thing of a comparative example.

  Based on FIGS. 1-3, one Example of the air cleaner 1 which concerns on this invention is described in detail. The air cleaner 1 includes a case body 2 made of a synthetic resin having a box shape, a filter element 4 configured by integrating a plurality of filter media such as filter papers into a rectangular frame, and a cover 6 made of a synthetic resin. . The case body 2 has a rectangular and flat bottom surface 8, and the top surface is open. In the opening portion, the filter element 4 is detachably attached so as to be substantially parallel to the bottom surface 8. The cover 6 has an open bottom surface and is attached to the case body 2 so as to cover the filter element 4. The filter element 4 partitions the inside of the air cleaner 1 into a dust side chamber 10 on the case body 2 side and a clean side chamber 12 on the cover 6 side. An inlet pipe 22 having an intake port 20 is attached to a side wall 14a that is one end in the longitudinal direction of the case body 2, and the inlet pipe 22 extends along the longitudinal center line L (FIG. 3) of the case body 2. It extends. One end of the inlet pipe 22 is connected to an outside air introduction duct (not shown). On the other hand, an outlet pipe 26 having an intake outlet 24 is attached to one side wall that is a side surface of the cover 6, and the outlet pipe 26 extends in the width direction orthogonal to the center line L in the longitudinal direction. One end of the outlet pipe 26 is connected to an intake manifold of an internal combustion engine (not shown). Accordingly, the intake air basically flows along the longitudinal direction (direction along the center line L) of the air cleaner 1 from the intake intake port 20 on the left side of FIG. 1 toward the intake outlet 24 on the right side of FIG. 1, the left side of FIGS. 1 and 3 is the “upstream side” and the right side is the “downstream side”.

  A V-shaped guide wall 30 is erected on the bottom surface 8 of the case body 2. The guide wall 30 is located substantially at the center in the longitudinal direction of the filter element 4 and is arranged such that the apex angle portion 31 faces the intake air inlet 20. As shown in FIG. 3, the guide wall 30 includes a pair of rectangular plate-like wall portions 32, and these plate-like wall portions 32 form a predetermined angle (for example, about 60 °) at the apex corner portion 31. Are faced to each other. The apex of the guide wall 30 is located on the longitudinal center line L. As shown in FIG. 3, each plate-like wall portion 32 extends from the apex portion 31 to the vicinity of the side wall 14b of the case body 2, and a flow path 36 is formed between the downstream end portion 34 and the side wall 14b. Each is formed. Further, as shown in FIG. 1, the upper end 38 of the guide wall 30 that is parallel to the filter element 4 is located above the intake air inlet 20 and is separated from the filter element 4 at a predetermined interval. A clearance is formed between the upper end 38 of the guide wall 30 and the bottom surface of the filter element 4. The guide wall 30 may be formed integrally with the case main body 2 or may be formed separately and attached to the bottom surface 8 of the case main body 2.

  As shown in FIG. 3, a circular dust collection hole 40 is formed in the bottom surface 8 of the case body 2 in the V-shaped inner region of the guide wall 30. The dust collection hole 40 is disposed in the vicinity of the apex portion 31 of the guide wall 30, and the center is located on the center line L in the longitudinal direction. Further, a circular communication port 42 having an opening area smaller than that of the dust collection hole 40 is formed in the bottom surface 8 of the case body 2 at a downstream position away from the dust collection hole 40. The communication port 42 is disposed, for example, in the vicinity of the side wall 14 c that is the other end in the longitudinal direction of the case body 2. It is desirable that the communication port 42 is disposed by selecting a position where the pressure is lower than the opening position of the dust collection hole 40 during operation of the engine, and the center is located on the center line L in the longitudinal direction. desirable.

  A synthetic resin under cover 50 formed separately from the case body 2 is welded to the bottom of the case body 2. The box-like undercover 50 having an open top surface has a rectangular and flat bottom surface 51, and a dust collection chamber 52 is defined between the bottom surface 51 and the bottom surface 8 of the case body 2. A circular dust discharge hole 54 is formed in the bottom surface 51. The dust discharge hole 54 is disposed between the dust collection hole 40 and the communication port 42 (see FIG. 1). The center of the dust discharge hole 54 is located on the center line L in the longitudinal direction. The dust collection chamber 52 communicates with the dust side chamber 10 through the dust collection hole 40 and the communication port 42, and communicates with the outside of the air cleaner 1 through the dust discharge hole 54.

  A dust discharge pipe 56 is connected to the dust discharge hole 54, and a vacuator valve 58 made of an elastic material such as rubber is attached to the end of the dust discharge pipe 56. The vacuator valve 58 has a lip-shaped opening, and this opening is intermittently opened according to pressure pulsation in the engine low speed range, for example.

  Next, the operation of the air cleaner 1 of the present embodiment will be described with reference to FIGS. During the operation of the engine, air flows from an outside air introduction duct (not shown) through the inlet pipe 22 and the intake intake 20 into the dust side chamber 10. The air that has flowed in collides with the guide wall 30 to become a divided flow, is guided by the plate-like wall portion 32, rises, and passes through the filter element 4. The dust in the air is collected by the filter element 4, and the air from which the dust has been removed flows into the clean side chamber 12 and flows out from the air cleaner 1 through the intake outlet 24.

  As described above, according to the above-described embodiment, the guide wall 30 is provided on the bottom surface 8 of the case body 2, so that the air colliding with the guide wall 30 starts to rise on the upstream side, and further upstream of the filter element 4. Since dust is collected also in the region, the region of the filter element where dust can be collected can be effectively expanded without increasing the size of the filter element.

  On the other hand, the dust that is not collected by the filter element 4 and stays in the vicinity of the bottom surface 8 of the case body in the dust side chamber 10 is caused by an air flow that passes through the flow path 36 to the inner region of the guide wall 30. It is guided to the inner region of the guide wall 30 and falls into the dust collection chamber 52 through the dust collection hole 40. Therefore, the dust that has fallen into the dust collection chamber 52 does not adhere to the filter element 4 again.

  In particular, in an engine operating condition in which the opening position of the communication port 42 is lower than the opening position of the dust recovery hole 40, the air circulates effectively through the dust recovery hole 40 and the communication port 42. The air flow promotes the fall of the dust passing through the dust collection hole 40, and the dust is carried downstream and collected in the dust discharge pipe 56. Thereafter, the dust is discharged out of the air cleaner 1 through this opening, for example, when the tip of the vacuator valve 58 is opened during operation in a low speed region.

  According to the above embodiment, in addition to being able to expand the dust collection area of the filter element 4 by the guide wall 30, a part of the dust is dropped into the dust collection chamber 52 and the air cleaner 58 is interposed via the vacuator valve 58. 1 is discharged to the outside, the good dust collecting ability can be maintained for a longer period of time, and the service life of the filter element 4 can be extended. For example, according to the air cleaner 1 of the embodiment, the collection efficiency and the ventilation resistance are not deteriorated as compared with an air cleaner having a configuration that does not include the guide wall 30, the dust collection hole 40, the communication port 42, and the dust collection chamber 52. The amount of dust collected is improved by about 30%.

  Furthermore, in the air cleaner 1 as an example, the dust collection chamber 52 can be made to function as a kind of resonator by appropriate tuning. FIG. 4 shows the permeation loss (TL) of the air cleaner of the present invention in comparison with a comparative air cleaner that does not include the dust collection hole 40, the communication port 42, and the dust collection chamber 52. In FIG. 4, the horizontal axis represents frequency, and the vertical axis represents transmission loss (TL). For example, as shown in FIG. 4, in the example, an increase in transmission loss of about several decibels was observed with respect to the comparative example in a region near 150 Hz and a region between 300 Hz and 450 Hz surrounded by a broken line.

  As mentioned above, although one Example of this invention was described, this invention is not restricted to the said Example, A various change is possible.

  In the illustrated embodiment, the dust collection hole 40, the communication port 42, and the dust discharge hole 54 are circular. However, the shape is not limited to this, and may be other shapes such as a triangle or a rectangle. Further, the dust collection hole 40 and the communication port 42 do not have to have the same shape, and may have different shapes.

  In the illustrated embodiment, the separate under cover 50 is attached to the bottom of the case main body 2, but without attaching the separate under cover 50, a partition plate is provided in the case main body 2 to provide a case main body. 2 may be divided into a dust side chamber 10 and a dust collection chamber 52.

DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Case main body 4 Filter element 10 Dust side chamber 30 Guide wall 40 Dust collection hole 42 Communication port 50 Undercover 52 Dust collection chamber 54 Dust discharge hole

Claims (3)

A box-shaped case body with an open upper surface;
A filter element detachably attached to the upper surface opening of the case body;
A cover attached to the case body so as to cover the filter element;
With
A dust side chamber is defined between the bottom surface of the case body and the filter element, and a clean side chamber is defined between the cover and the filter element;
An intake inlet is opened in the side wall of the case body, and an intake outlet is opened in the cover;
A V-shaped guide wall is erected on the bottom surface of the case body so that the apex portion faces the intake intake port, and a dust collection hole is formed in an inner region of the guide wall. And
An air cleaner, wherein an under cover is attached to the bottom of the case body so as to cover the dust collection hole so as to form a dust collection chamber.   2. The communication port according to claim 1, wherein an opening area is smaller than the dust collection hole, and a communication port communicating the dust side chamber and the dust collection chamber is formed in the bottom surface of the case body. Air cleaner.   The air cleaner according to claim 2, wherein a vacuator valve is attached to a bottom surface of the under cover.

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