JP2018132047A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner which can inhibit turbulence of airflow that has passed through a filter element.SOLUTION: An air cleaner 100 includes: a hollow case 10 having a suction port 12; a hollow cover 20 having an exhaust port 22; a filter element 30 which is sandwiched between the case 10 and the cover 20 and filters air suctioned from the suction port 12; and a rectifying part 40 which is disposed in the cover 20 and rectifies airflow that has passed through the filter element 30. The rectifying part 40 has: a rectifying protrusion 41 which protrudes to the inner side of the cover 20 so as to narrow an airflow passage in the cover 20; and a support medium 2 extending in a direction intersecting with the rectifying protrusion 41 and supporting the rectifying protrusion 41.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an air cleaner that filters air.

  Conventionally, in order to filter combustion air supplied to an internal combustion engine, an air cleaner containing a filter element has been used (see Patent Documents 1 and 2). An air flow sensor is disposed in a duct provided between this type of air cleaner and the internal combustion engine, and is used for intake control of the internal combustion engine by measuring the air flow rate (see Patent Document 2).

Japanese Patent Laying-Open No. 2015-0405547 Japanese Patent Laid-Open No. 06-102077

  However, in the air cleaners found in these Patent Documents 1 and 2, the air flow that has passed through the filter element is disturbed due to the resistance of the air passing through the filter element. In some cases, measurement could not be performed accurately and stably.

  Then, this invention is made | formed in view of the above subject, and it aims at providing the air cleaner which can suppress the disturbance of the airflow which passed the filter element.

(1) One aspect of the present invention includes a hollow case having an inlet, a hollow cover having an outlet, and the case and the cover, and is sucked from the inlet. An air cleaner comprising: a filter element that filters the filtered air; and a rectification unit that is disposed in the cover and rectifies the air flow that has passed through the filter element, wherein the rectification unit is an air flow path in the cover. A rectifying protrusion protruding inside the cover and a support body extending in a direction intersecting the rectifying protrusion and supporting the rectifying protrusion.
(2) In the above aspect (1), the support may be in contact with the filter element.
(3) In the above aspect (2), the filter element has a filter main body formed of a nonwoven fabric or filter paper, and an element frame surrounding the filter main body, and the support is attached to the element frame. It may be in contact.
(4) In any one of the above aspects (1) to (3), the support is formed in a thin plate shape, and is parallel to the air flow direction from the suction port toward the discharge port. It may be provided.
(5) In any one of the above aspects (1) to (4), the support is formed such that the innermost end is the same as the innermost end of the rectifying protrusion or does not protrude. May be.
(6) In any one of the above aspects (1) to (5), the rectifying unit may be formed and attached as a separate member to the cover.

  ADVANTAGE OF THE INVENTION According to this invention, the air cleaner which can suppress the disturbance of the airflow which passed the filter element can be provided.

It is a top view of the air cleaner which concerns on embodiment of this invention. It is an AA line sectional view in Drawing 1 of an air cleaner. It is the BB sectional drawing in FIG. 1 of an air cleaner. It is a C section perspective view of a rectification part. It is the C section enlarged view of a rectification | straightening part. It is a figure which shows the experimental result about the variation of an airflow sensor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments of the present specification, the same members are denoted by the same reference numerals throughout.

  An air cleaner 100 according to an embodiment of the present invention will be described. FIG. 1 is a plan view of an air cleaner 100 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the air cleaner 100 taken along line AA in FIG. 1, and FIG. It is B line sectional drawing.

  An air cleaner 100 shown in FIG. 1 is used for filtering combustion air supplied to an internal combustion engine (not shown), and includes a case 10, a cover 20, and a filter element 30 for filtering air. .

  The case 10 is a hollow rectangular parallelepiped having side surfaces 10a to 10d and a bottom surface 10e opened on the cover 20 side, and a suction duct 11 having a suction port 12 is formed on the side surface 10a.

  On the other hand, the cover 20 is a hollow rectangular parallelepiped having side surfaces 20a to 20d and a top surface 20e opened on the case 10 side, and a discharge duct 21 having a discharge port 22 is formed on the side surface 20b facing the side surface 10a of the case 10. Is formed. The exhaust duct 21 is provided with an air flow sensor 50 for measuring the air flow rate, and is used for intake control of the internal combustion engine. However, the position where the air flow sensor 50 is provided is not limited to this as long as it is between the air cleaner 100 and the internal combustion engine (throttle valve).

  The case 10 and the cover 20 are fitted and integrated with each other so as to abut the opening sides while holding the filter element 30 therebetween. Specifically, the flange 10f of the case 10 is fitted to a flange 32f, which will be described later, of the filter element 30 inside the L-shaped flange 20f of the cover 20, and a clamp, clip, bolt, etc., not shown. The case 10 and the cover 20 are connected and integrated by a locking means such as a fixing means or a claw.

  The case 10 and the cover 20 are formed by injection molding various plastic resins such as polypropylene.

  Subsequently, the filter element 30 has a filter main body 31 that filters air and an element frame 32 that surrounds the filter main body 31 (see FIGS. 2 and 3).

  The filter body 31 is formed by bending a filter medium sheet formed of a nonwoven fabric or filter paper into a wave shape (pleated shape). The filter main body 31 is disposed so that the waved traveling direction coincides with the direction of the side surfaces 20 a and 20 b facing the cover 20.

  The element frame 32 is a rectangular frame having substantially the same dimensions as the case 10 forming the hollow part and the inner walls 10g, 20g of the cover 20, and is formed so as to surround the filter body 31, and a flange 32f is formed on the outer periphery. Has been. The element frame 32 is formed such that the downstream side in the air passage direction is the same as or slightly protruding from the wave-like height of the filter body 31.

  The element frame 32 is formed of a hard or soft plastic resin so that the shape retention and rigidity as the filter element 30 can be maintained. In this embodiment, the element frame 32 is formed of a soft plastic resin in which a packing portion (not shown) is integrally formed on the flange 32f. However, the element frame 32 is formed of a hard plastic resin, and the packing portion is a rubber molded product or the like. Other parts may be used for assembly.

  Next, the rectifying unit 40 will be described. FIG. 4 is a perspective view of part C of the rectification unit 40, and FIG. 5 is an enlarged view of part C of the rectification unit 40.

  The rectifying unit 40 rectifies the air flow that has passed through the filter element 30, is formed as a separate member with respect to the cover 20, and is detachably attached (see FIGS. 2 and 3). Specifically, the rectifying unit 40 protrudes in a frame shape toward the inner side than the inner walls 20g of the side surfaces 20a to 20d of the cover 20 so as to narrow the air flow path in the cover 20.

  The rectifying unit 40 includes a frame-shaped rectifying protrusion 41 disposed so as to intersect the inner wall 20g of the cover 20, a support body 42 extending in a direction intersecting the rectifying protrusion 41 (a direction along the inner wall 20g), have.

  The rectifying protrusion 41 is a rectangular frame-shaped plate member having a width of about 5 mm to 25 mm and a thickness of about 2 mm to 5 mm. In the present embodiment, the innermost end portion 41a has a flat shape in a side view, but the rectifying protrusion 41 is not limited to this, and even if it has a sharp shape like a triangle in a side view, it is rounded. It may have a semicircular shape, a quarter arc shape, or a reverse quarter arc shape, and may be appropriately selected according to the rectification conditions.

  On the other hand, the support 42 is a thin plate that reinforces and supports the rectifying protrusion 41 at a plurality of locations, and extends from the upstream surface of the rectifying protrusion 41 at a predetermined interval. The interval between the adjacent supports 42 may be continuously provided at about 10 mm to 50 mm, or may be provided only in the vicinity of the central portion of each side corresponding to each side surface 20a to 20d of the cover 20.

  Further, the support 42 has a height of about 5 mm to 25 mm. The width of the support 42 is such that the innermost end 42a is different from the innermost end 41a of the rectifying protrusion 41 as shown in FIG. They are formed to be in the same position. At this time, the upstream end of the support 42 slightly protrudes inward from the width of the element frame 32.

  However, the width of the support 42 may be the same as the width of the element frame 32 as shown in FIG. 5B unless it protrudes inward from the innermost end 41a of the rectifying protrusion 41. Alternatively, as shown in FIG. 5 (c), a shape that gradually spreads from the width of the element frame 32 to the innermost end 41 a of the rectifying protrusion 41 may be used. Further, in the shape of these support bodies 42, the upstream end may protrude inward from the width of the element frame 32, or may be the same as or narrower than the width of the element frame 32.

  Further, the support 42 is provided so as to be parallel to the direction of the air flow from the suction port 12 toward the discharge port 22, that is, corresponding to all the inner walls 20 g of the side surfaces 20 a to 20 d of the cover 20. However, it may be provided only on the side surfaces 20a and 20b corresponding to the positions of the suction port 12 and the discharge port 22, or may be provided only on the side surfaces 20c and 20d.

  And this rectification | straightening part 40 is good to be attached with respect to the cover 20 in the position (height) which contacts the element frame 32 so that the support body 42 may contact the filter element 30 especially. The rectifying unit 40 is attached to the cover 20 by attachment means such as caulking, adhesion, or welding.

  Note that the rectifying protrusions 41 and the support body 42 of the rectifying unit 40 are integrally formed by injection molding using various plastic resins such as polypropylene.

  Here, in order to confirm the effect of the rectifying unit 40, the experimental result of measuring the variation in the flow rate measurement value (mass flow rate: g / s) of the air flow sensor 50 by changing the air flow rate sucked into the air cleaner 100 explain. The variation was a ratio (%) obtained by dividing three times the standard deviation of the flow rate measurement value by the air flow sensor 50 at each constant air flow rate (g / s) by the average value of the flow rate measurement values.

(Example)
In the embodiment, a rectifying unit 40 having a rectifying protrusion 41 and a support 42 as shown in FIG. 5A is attached to the air cleaner 100.

(Comparative Example 1 and Comparative Example 2)
In Comparative Example 1, the rectifying unit 40 shown in FIG. 5A having no support 42 and having only the rectifying protrusion 41 was manufactured and attached to the air cleaner 100.
On the other hand, Comparative Example 2 was performed with the air cleaner 100 not attached to the rectifying unit 40.

FIG. 6 is a diagram illustrating experimental results regarding variations in the airflow sensor 50.
As shown in FIG. 6, in a large amount of air flow rate range, there is no difference in measured values between Example and Comparative Example 1 and Comparative Example 2, but the air flow rate range from a small amount to a medium amount Then, it can be read that the variation in the measured values in the examples is greatly improved. The effect of suppressing the variation in the measured value by the support 42 added to the rectifying protrusion 41 that can be read from the comparison between the example and the comparative example 1 is read from the comparison between the comparative example 1 and the comparative example 2. This can be said to be greater than the effect of suppressing variation in measured values by the rectifying protrusion 41. Under these experimental conditions, the variation in the measured values was reduced by about 30% at the maximum.

  This is because air (especially air flowing in the vicinity of the inner wall 20g) through which the support 42 has passed through the filter element 30 flows between the supports 42 along the surface of the support 42 and is guided to the rectifying protrusion 41. This is thought to be due to a collision (perpendicular) with the straightening protrusion 41.

  As described above, the air cleaner 100 according to the embodiment of the present invention is sandwiched between the hollow case 10 having the suction port 12, the hollow cover 20 having the discharge port 22, and the case 10 and the cover 20. The air cleaner 100 includes a filter element 30 that filters air sucked from the inlet 12 and a rectifying unit 40 that is disposed in the cover 20 and rectifies the air flow that has passed through the filter element 30. Reference numeral 40 denotes a rectifying protrusion 41 protruding inward of the cover 20 so as to narrow the air flow path in the cover 20, and a support body 42 that extends in a direction intersecting the rectifying protrusion 41 and supports the rectifying protrusion 41. , Has.

  Thereby, the turbulence of the air flow that has passed through the filter element 30 can be suppressed, and the flow velocity distribution of the air flowing in the duct to the air cleaner 100 and the internal combustion engine can be made uniform. Further, even if the rectifying protrusion 41 of the rectifying unit 40 protrudes inward, the rectifying protrusion 41 (rectifying unit 40) is bent by the air passage resistance because it is reinforced and supported by the support 42, Vibrating is suppressed.

  In the embodiment, the support 42 is in contact with the filter element 30. Thereby, since the support body 42 that reinforces and supports the rectifying protrusion 41 is also reinforced and supported by the filter element 30, the rectifying unit 40 can be provided more firmly to the air cleaner 100.

  In the embodiment, the filter element 30 has a filter main body 31 formed of a nonwoven fabric or filter paper, and an element frame 32 surrounding the filter main body 31, and the support 42 is in contact with the element frame 32. Thereby, since the support body 42 is supported by the highly rigid element frame 32 of the filter element 30, the rectifying unit 40 can be provided more firmly with respect to the air cleaner 100.

  In the embodiment, the support 42 is formed in a thin plate shape, and is provided in parallel to the direction of the air flow from the suction port 12 toward the discharge port 22. Thereby, the support body 42 does not substantially resist the air flow from the suction port 12 toward the discharge port 22, and can be appropriately rectified by the rectification protrusion 41.

  In the embodiment, the support body 42 is formed such that the innermost end portion 42 a is the same as the innermost end portion 41 a of the rectifying protrusion 41 or does not protrude. Thereby, the support body 42 does not substantially resist the air flow from the suction port 12 toward the discharge port 22, and can be appropriately rectified by the rectification protrusion 41.

  In the embodiment, the rectifying unit 40 is formed and attached as a separate member to the cover 20. Thereby, even if the supply air flow rate is changed according to the internal combustion engine, it can be dealt with by a design change of only the rectifying unit 40, and can be applied to various types of internal combustion engines.

(Modification)
In the above embodiment, the air flows in the Z shape from the air inlet 100 to the air outlet 22 through the air cleaner 100. However, the position having the air outlet 12 to the air outlet 22 is not limited to this. By having the discharge duct 21 on the bottom surface 10 e of the top surface 20 e of the cover 20, the air may flow straight from the air cleaner 100 to the discharge port 22 through the air cleaner 100.

  In the above embodiment, the rectifying unit 40 is formed and attached as a separate member to the cover 20, but the rectifying unit 40 and the cover 20 may be integrally formed.

  In the above embodiment, the support body 42 is formed on the filter element 30 side (upstream side) of the rectifying protrusion 41, but may be formed only on the discharge port 22 (downstream side), and on the upstream side and the downstream side. It may be formed. By forming the support 42 on the downstream side, the air flow whose flow velocity is increased by the rectifying protrusion 41 can be rectified. At this time, the height of the support 42 is preferably lower than the lower end of the discharge duct 21 in the case of FIG. 2, for example, and reaches the top surface 20e when the discharge duct 21 is provided on the top surface 20e. May be.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the gist of the present invention described in the claims. It can be changed.

10 cases, 10a to 10d side surfaces, 10e bottom surfaces, 10f flanges, 11 suction ducts, 12 suction ports 20 covers, 20a to 20d side surfaces, 20e top surfaces, 20f flanges, 20g inner walls, 21 discharge ducts, 22 discharge ports 30 filter elements, 31 Filter body, 32 Element frame, 32f Flange 40 Rectification part, 41 Rectification protrusion, 41a Innermost end part, 42 Support body, 42a Innermost end part 50 Air flow sensor 100 Air cleaner

Claims (6)

A hollow case having a suction port;
A hollow cover having a discharge port;
A filter element that is sandwiched between the case and the cover and filters the air sucked from the suction port;
A rectifier disposed in the cover and rectifying an air flow that has passed through the filter element; and an air cleaner comprising:
The rectifying unit has a rectifying protrusion protruding inside the cover so as to narrow an air flow path in the cover;
An air cleaner, comprising: a support body that extends in a direction intersecting the rectifying protrusion and supports the rectifying protrusion. The air cleaner according to claim 1, wherein the support is in contact with the filter element. The filter element is a filter body formed of nonwoven fabric or filter paper,
An element frame surrounding the filter body,
The air cleaner according to claim 2, wherein the support is in contact with the element frame. The said support body is formed in thin plate shape, and it is provided in parallel with the direction of the airflow which goes to the said discharge port from the said suction inlet. The any one of Claim 1 to 3 characterized by the above-mentioned. The air cleaner according to item. The said support body is formed so that the innermost edge part may be the same as the innermost edge part of the said baffle protrusion, or it does not protrude. The one of Claim 1 characterized by the above-mentioned. Air cleaner. The air cleaner according to any one of claims 1 to 5, wherein the rectifying unit is formed and attached as a separate member to the cover.

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