JP5558763B2 - Air filter - Google Patents

Description

  The present invention relates to a structure of an air filter that filters gas in a ventilation passage, and more particularly, to a structure of an air filter provided in a ventilation passage of an internal combustion engine.

  Conventionally, various air filters are known as air filters for filtering the gas in the ventilation passage. In such an air filter, when the position of the filter element housed in the air filter is located in a direction perpendicular to the flow direction of the gas that has passed through the ventilation passage, the inflowing gas directly hits the filter element, and the gas There is a problem that dust such as dust in the gas concentrates on the direct contact location, causing the filter element to be clogged at an early stage and blowing the dust to the clean side.

  In order to prevent such dust blow-through, in addition to designing the filter element not to be arranged in the gas inflow direction, for the purpose of preventing dust from concentrating on a part of the filter element, Various structures are known.

JP 2005-188363 A Japanese Patent Application Laid-Open No. 8-100718

  The air cleaner described in Patent Document 1 is formed in a conical shape in which the passage width gradually decreases from the filter element toward the upstream side in the case, and has an opening of a predetermined size at the tip thereof. Includes a rod projecting movably from the center of the filter toward the upstream side, a rectifying block disposed at the tip of the rod, the upstream tip being formed in a streamlined shape, and a predetermined distance from the periphery of the opening. A spring for holding the rectifying block is provided in the open position.

  By providing such a configuration, in the air cleaner described in Patent Document 1, since the flow straightening block is formed in a streamline shape, ventilation to the filter element can be made uniform, and the life of the filter element can be improved. .

  The air cleaner described in Patent Document 2 forms a casing with a cover having an intake opening and a body having an exhaust opening, and a drift in which the opening changes in the vicinity of the intake opening in the casing according to the flow rate of the intake air. The plate is disposed to be inclined toward the intake opening.

  By providing such a configuration, the air cleaner described in Patent Document 2 collides with the drift plate to change the direction of the flow, and the opening degree of the drift plate also changes. Accordingly, the filter element is appropriately dispersed on the surface of the filter element, so that the entire surface of the filter element is subjected to filtration, a rapid increase in suction resistance is suppressed over a long period of time, and the filtration life can be maintained long.

  However, according to the configuration of the conventional air cleaner described above, the flow resistance is increased because the flow of the gas is dispersed by disposing the rectifying block and the drift plate near the inlet for introducing the gas in the ventilation passage. As a result, there is a problem that the deterioration of the function as an air filter cannot be avoided.

  Accordingly, the present invention has been made in view of the above problems, and an air filter that can distribute the gas introduced from the ventilation passage to the surface of the filter element without increasing the ventilation resistance and can provide the entire surface of the filter element for filtration. The purpose is to provide.

The air filter according to the present invention is formed with a filter element that filters the gas in the ventilation passage, a suction port that introduces the gas, and a discharge port that discharges the gas filtered by the filter element to the ventilation passage. And an air filter including a case for housing the filter element so as to be partitioned into a dust side communicating with the suction port and a clean side communicating with the discharge port. A back wall portion is formed, and the back wall portion is formed at a position that faces when the gas introduced from the suction port is introduced along the suction direction, and the filter of the back wall portion is formed. The shape of the contact surface with the element is the same as the shape of the opening of the suction port in the filter element along the gas suction direction. Equal to the projected image of a shadow or, and greater than the projected image.

  In the air filter according to the present invention, it is preferable that the opening edge of the suction port is formed in an R shape that widens from the suction port toward the dust side.

  In the air filter according to the present invention, it is preferable that the dust side includes a dispersion rib that disperses the gas introduced from the suction port in a direction intersecting the ventilation passage.

  Further, in the air filter according to the present invention, the case includes a bottomed cylindrical first case that separates the dust side, and a bottomed cylindrical second case that separates the clean side, The first case and the second case can be engaged, and the filter element can be sandwiched and stored between the first case and the second case.

  In the air filter according to the present invention, it is preferable that the dispersion rib is formed so as to protrude from a bottom portion of the first case.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these features can also be the invention.

  The air filter according to the present invention includes a back wall portion that comes into contact with the filter element, so that dust can be prevented from being blown into the clean side, and the air intake opening area is not reduced. It can suppress that resistance becomes large.

  In addition, the air filter according to the present invention has an opening edge of the intake port formed in an R shape (funnel shape), so that the gas introduced from the intake port can be appropriately dispersed in the dust side, The performance of the filter element can be maintained for a long time.

  In addition, since the air filter according to the present invention includes the dispersion rib on the dust side, the gas introduced from the intake port can be appropriately dispersed in the dust side, and the performance of the filter element is maintained for a long period of time. be able to.

  Further, the air filter according to the present invention is formed so that the filter element is sandwiched between the bottomed cylindrical first case and the bottomed cylindrical second case, so that the air filter can be easily manufactured. can do.

  Moreover, since the air filter which concerns on this invention formed the dispersion rib protruding from the bottom part of the 1st case, it can form a dispersion rib easily.

The top view for demonstrating the outline | summary of the air filter which concerns on this embodiment. AA sectional drawing in FIG. The top view for demonstrating the 1st case which comprises the air filter which concerns on this embodiment. The side view which shows the shape of the opening part of the 1st case which comprises the air filter which concerns on this embodiment. The top view for demonstrating the 2nd case which comprises the air filter which concerns on this embodiment. The side view which shows the shape of the opening part of the 2nd case which comprises the air filter which concerns on this embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  FIG. 1 is a plan view for explaining an outline of an air filter according to the present embodiment, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 shows the air filter according to the present embodiment. FIG. 4 is a side view showing the shape of the opening of the first case constituting the air filter according to the present embodiment, and FIG. FIG. 6 is a plan view for explaining a second case constituting the air filter according to the present embodiment, and FIG. 6 is a side view showing the shape of the opening of the second case constituting the air filter according to the present embodiment. FIG.

  As shown in FIG. 1, the air filter 1 according to the present embodiment is interposed in the ventilation passage by connecting the suction port 11 and the discharge port 21 to the ventilation passage (not shown). Thus, the air filter 1 is interposed in the ventilation passage, so that the gas passing through the ventilation passage can be filtered.

  As shown in FIG. 2, the air filter 1 includes a bottomed cylindrical first case 10 in which a suction port 11 is formed in a bottom portion 15, and a bottomed cylindrical first shape in which a discharge port 21 is formed in a bottom portion 25. 2 cases 20 are combined. In addition, the filter case 30 is sandwiched between the first case 10 and the second case 20, and a space defined by the first case 10 and the second case 20 is separated by the filter element 30. The dust side D and the clean side C are partitioned.

  The filter element 30 can use a known filter medium such as felt, non-woven fabric, filter paper, and the like, and can be formed into a desired shape such as a pleated shape, a sheet shape, or the like. Thus, since the inside of the air filter 1 is partitioned into the dust side D and the clean side C by the filter element 30, when the gas introduced from the suction port 11 is discharged to the discharge port 21, the filter element By passing through 30, dust such as dust in the gas can be removed, and the filtered gas can be discharged from the discharge port 21.

  As shown in FIGS. 3 and 4, the first case 10 is formed in a bottomed cylindrical shape, and a suction port 11 is formed in the bottom portion 15 so as to open. In addition, a plurality of dispersion ribs 14 protrude from the bottom portion 15 so that the gas introduced from the suction port 11 can be dispersed in the direction intersecting the ventilation passage (the surface direction of the filter element 30). It is installed. As shown in FIG. 2, the opening edge 12 on the dust side D side of the suction port 11 is formed in an R shape, and the gas introduced into the opening edge 12 is vented by the R shape. It is formed so that it can disperse | distribute in the direction (surface direction of the filter element 30) which cross | intersects. The R shape may be formed in a funnel shape that spreads from the suction port 11 toward the dust side D.

  Further, a welding rib 13 is formed on the entire periphery of the opening edge of the first case 10 and is formed at a position where it abuts on the welding flange 24 when combined with the second case 20 described later. .

  As shown in FIGS. 5 and 6, the second case 20 is formed in a bottomed cylindrical shape, and a discharge port 21 is formed in the bottom portion 25 so as to open. Further, in order to prevent the filter element 30 from being deformed / dropped with respect to the passage of gas, the bottom portion 25 is provided with a plurality of pressing ribs 23 so as to protrude. The shape of the pressing rib 23 may be formed in a plate shape as shown in FIG. 6 or may be formed in a rod shape. Such a shape can be appropriately changed according to the amount and position of gas passing through. Further, a welding flange 24 is formed on the entire periphery of the opening edge of the second case 20.

  The first case 10 and the second case 20 are both made of synthetic resin such as polypropylene, and are combined so that the open ends of the first case 10 and the second case 20 are brought into contact with each other. The air filter 1 is formed by welding the welding rib 13 and the welding flange 24 formed in each case by vibration welding.

  Further, the second case 20 is formed with a back wall portion 22 in contact with the filter element 30 on the clean side C. As shown in FIGS. 4 and 6, the back wall portion 22 is formed at a position where the back wall portion 22 faces when the gas introduced from the suction port 11 is introduced along the suction direction. The shape of the abutting surface that abuts the filter element 30 on the back wall 22 is formed larger than the projected image obtained by projecting the opening shape of the suction port 11 onto the filter element 30 along the gas suction direction.

  Next, the gas ventilation direction in the air cleaner 1 will be described with reference to FIG. 2 again.

As shown in FIG. 2, the gas introduced from the suction port 11 is introduced into the air filter 1 along the ventilation direction B. Here, a part of the introduced gas directly proceeds from the suction port 11 toward the filter element 30 along the ventilation direction B. Then, it passes through the filter element 30 and passes to the clean side C. At this time, since the back wall portion 22 is formed on the clean side C side of the filter element 30, the gas directly introduced from the intake port 11 hits the back wall portion 22, so that it does not blow through the clean side C. Absent. Further, as shown in the ventilation direction B ₁ , the gas that hits the back wall portion 22 changes its ventilation direction along the back wall portion 22, travels through the filter element 30, and then escapes to the clean side C side. To pass through.

  In this way, the gas that has hit the back wall 22 changes the traveling direction and travels in the filter element 30, so that even if the back wall 22 is formed on the clean side C, the back wall 22 prevents the air filter from forming. The filter function of 1 is not impaired.

Further, among the gases introduced from the intake port 11, gases other than the gas directly traveling toward the filter element 30 are indicated in the ventilation direction B ₂ by the R shape formed at the opening edge 12 of the intake port 11. In the dust side D. Further, since the dispersion rib 14 as shown in FIG. 4 is formed on the dust side D side so as to protrude from the bottom 15 of the first case 10, the dispersion of gas in the dust side D is promoted.

  In the air filter 1 formed in this way, since the gas introduced from the air inlet 11 is dispersed in the dust side D, the entire surface of the filter element 30 can be used for gas filtration. It is possible to prevent dust from accumulating on the part, and the performance of the filter element 30 can be maintained for a long time.

  As described above, the air cleaner 1 according to the present embodiment includes the back wall portion 22 in contact with the filter element 30 on the clean side C side. Even if it hits, it can prevent that dust blows through to the clean side C side. Moreover, since the member which becomes ventilation resistance, such as the baffle plate which covers the opening part of the inlet port 11, is not arrange | positioned, it can suppress that ventilation resistance becomes large.

  Furthermore, since the gas introduced from the intake port 11 can be dispersed in the dust side D, the entire surface of the filter element 30 can be subjected to gas filtration, and the performance of the filter element 30 can be maintained for a long time. .

  In the present embodiment, the air filter 1 in which the first case 10 and the second case 20 are formed of synthetic resin and these are welded by vibration welding has been described. However, the air filter according to the present embodiment is For example, the first case 10 and the second case 20 may be made of metal, and the first case 10 and the second case 20 are fastened with well-known bolts and nuts. It doesn't matter. In this case, a packing can be interposed between the contact surfaces of the first case 10 and the second case 20 as an airtight means as necessary.

  Furthermore, in this embodiment, although the case where the shape of the back wall part 22 was larger than the opening shape of the inlet port 11 was demonstrated, the back wall part 22 is in the position where the gas introduce | transduced from the inlet port 11 hits directly. Since it should just be formed, you may form the shape of the contact surface with the filter element 30 of the back wall part 22 with the opening shape of the inlet port 11.

  Moreover, although the air filter 1 was demonstrated in this embodiment, the air filter 1 which concerns on this embodiment is not limited to this use, For example, it can also apply to an air cleaner or a canister. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Air filter, 10 1st case, 11 Inlet, 12 Funnel part, 13 Welding rib, 14 Dispersion rib, 15, 25 Bottom part, 20 Second case, 21 Outlet, 22 Back wall part, 23 Pressing rib, 24 welding flange, 30 filter element, B, B ₁ , B ₂ air flow direction, C clean side, D dust side.

Claims (5)

A filter element for filtering the gas in the ventilation passage;
A suction side for introducing the gas and a discharge side for discharging the gas filtered by the filter element to the ventilation passage, and a dust side communicating with the suction port and a clean side communicating with the discharge port In an air filter comprising a case for storing the filter element so as to be divided into
On the clean side, a back wall portion that contacts the filter element is formed,
The back wall is formed at a position where the gas introduced from the suction port faces when the gas is introduced along the suction direction,
The shape of the contact surface of the back wall portion with the filter element is equal to or larger than the projected image obtained by projecting the opening shape of the suction port onto the filter element along the gas suction direction. An air filter characterized by that. The opening edge of the inlet port, an air filter according to claim 1, characterized in that formed in the R shape spreading toward the dust side from the suction port. The dust side, air filter according to claim 1 or 2, characterized in that it comprises a dispersion rib the gas introduced from the suction port are dispersed in a direction crossing the vent passage. The case includes a bottomed cylindrical first case that separates the dust side, and a bottomed cylindrical second case that separates the clean side,
Is engaged with the second case and the first case, any one of claims 1 to 3, characterized in that housing by sandwiching the filter element by the first case and the second case The air filter described in 1. The air filter according to claim 4 , wherein the dispersion rib is formed to protrude from a bottom portion of the first case.

Images