JP2012207540A - Air cleaner - Google Patents

Abstract

An air cleaner capable of eliminating the turbulent flow caused by burrs at the inner folded end edge of a sealing material and improving the measurement accuracy of an air flow sensor.
A purifying outlet is opened at an end of a filter element, a sealing material is provided on an opening end surface of the purifying outlet, and an inner periphery of the sealing material is formed from an opening end surface of the purifying outlet. An inner folded portion 14 that is folded along the surface 11 b is provided, the purified air outlet 10 of the filter element 22 and the purified air inlet 15 of the purified air outlet pipe 8 communicate with each other, and the air flow sensor 9 is disposed in the purified air outlet pipe 8. In the air cleaner, the purified air introduction cylinder 16 is led out along the inside of the inner folded portion 14 of the sealing material 12 from the purified air inlet 15 of the purified air outlet pipe 8, and the outlet end 17 of the purified air inlet cylinder 16 is sealed. The inner fold end portion 26 of the inner fold portion 14 of the material 12 was made to protrude largely toward the clean air chamber 6 side.
[Selection] Figure 1

Description

  The present invention relates to an air cleaner, and more particularly to an air cleaner that can eliminate the turbulent flow caused by burrs at the inner folded end edge of a sealing material and can improve the measurement accuracy of an air flow sensor.

Conventionally, a cylindrical filter element is accommodated in a casing, an unpurified chamber is provided around the filter element, a purified chamber is provided in the filter element, and a purified outlet pipe is led out from the casing end wall, Open the purified air outlet at the end of the filter element, provide a sealing material on the open end face of the purified air outlet, contact the sealing material to the contact part, and contact the sealing material with the inner peripheral surface from the open end face of the purified air outlet There is an air cleaner that is provided with an inner folded portion that is folded along the filter element, communicates the purified air outlet of the filter element and the purified air inlet of the purified air outlet pipe, and arranges an air flow sensor in the purified air outlet pipe (for example, Patent Documents). 1).
According to this type of air cleaner, even if the duct structure on the downstream side of the purified air outlet pipe is different, there is an advantage that the measured value of the air flow sensor is hardly different and the air cleaner can be used for general purposes.
However, in this type of conventional technology, the air purification is disturbed by the burr at the inner folded edge of the sealing material that occurs when the sealing material is formed, and unexpected turbulence may occur in the air purification measured by the air flow sensor. There is a problem because there is no means for eliminating the turbulent flow caused by burrs at the inner folded edge of the material.

Japanese Patent Laying-Open No. 2004-124741 (see FIG. 1)

<Problem> The measurement accuracy of the air flow sensor is low.
Since there is no means for eliminating the occurrence of turbulent flow due to burrs at the inner folded edge of the sealing material, the measurement of the airflow sensor is disturbed by the turbulent flow, and the measurement accuracy of the airflow sensor is lowered.

  An object of the present invention is to provide an air cleaner that eliminates the occurrence of turbulent flow due to burrs at the inner folded end edge of a sealing material and can improve the measurement accuracy of an air flow sensor.

(Invention of Claim 1)
Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1 (A) (B), FIG. 3 (A) (B) or FIG. 5 (A) (B), a cylindrical filter element (22) is accommodated in the casing (1), An unpurified air chamber (3) is provided around the filter element (22), an air purifier chamber (6) is provided in the filter element (22), and an air purifier outlet pipe (8) is provided outward from the casing end wall (7). The air purification outlet (10) is opened at the end of the filter element (22), the sealing material (12) is provided on the opening end surface (11a) of the air purification outlet (10), and the sealing material (12) Is brought into contact with the contact portion (13), and the inner folded portion (14) folded back along the inner peripheral surface (11b) from the opening end surface (11a) of the air purifying outlet (10) to the sealing material (12). Provided, the air purifying outlet (10) of the filter element (22) communicates with the air purifying inlet (15) of the air purifying outlet pipe (8), and the air flow sensor (9) is disposed in the air purifying outlet pipe (8). To the air cleaner Leave
As illustrated in FIG. 1 (A) (B), FIG. 3 (A) (B) or FIG. 5 (A) (B), the sealing material (15) from the purified air inlet (15) of the purified gas outlet pipe (8). 12), the purified air introduction tube (16) is led out along the inside of the inner folded portion (14), and the outlet end (17) of the purified air introduction tube (16) is connected to the inner folded portion (12) of the sealing material (12). 14. An air cleaner characterized in that the air cleaner protrudes larger toward the clean air chamber (6) side than the inner folded end edge (26) of 14).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is possible to eliminate the occurrence of turbulent flow due to burrs at the inner folded edge of the sealing material, and to improve the measurement accuracy of the air flow sensor.
As illustrated in FIG. 1 (A) (B), FIG. 3 (A) (B) or FIG. 5 (A) (B), the sealing material (15) from the purified air inlet (15) of the purified gas outlet pipe (8). 12), the purified air introduction tube (16) is led out along the inside of the inner folded portion (14), and the outlet end (17) of the purified air introduction tube (16) is connected to the inner folded portion (12) of the sealing material (12). 14), the inner folded edge (26) of the inner folded portion (14) of the sealing material (12) is cleaned from the inner side because it protrudes larger toward the air purification chamber (6) side than the inner folded edge (26) of 14). Occurrence of turbulent flow due to the burr (28) of the inner folded end edge (26) of the sealing material (12), which is covered with the air introduction cylinder (16), can be improved, and the measurement accuracy of the air flow sensor (9) can be improved.

(Invention of Claim 2)
The invention according to claim 2 has the following effects.
<Effect> It is possible to reduce the influence of turbulence on the measurement of the air flow sensor, and to increase the measurement accuracy of the air flow sensor.
As illustrated in FIG. 1 (A) (B) or FIG. 3 (A) (B), the inner diameter of the passage from the purifying inlet (30) of the purifying introduction tube (16) to the mounting position of the air flow sensor (9). Is squeezed to be smaller than the inner diameter of the inner folded portion (14) of the sealing material (12). Can rectify the turbulent flow, reduce the influence of the turbulent flow on the measurement of the air flow sensor (9), and improve the measurement accuracy of the air flow sensor (9).

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2.
<Effect> Generation of turbulent flow due to the outer folded portion of the sealing material can be eliminated, and the measurement accuracy of the air flow sensor can be improved. The measurement accuracy of the air flow sensor can be further increased.
As illustrated in FIG. 1 (A) (B) or FIG. 3 (A) (B), the outlet end (17) of the air purification introduction tube (16) is connected to the outer folded portion (25) of the sealing material (12). Since the outer folded end edge (27) is protruded to the side of the clean air chamber (6), the outer folded end edge (27) of the outer folded portion (25) of the sealing material (12) is connected to the purified air introduction tube from the inside. (16) and the occurrence of turbulent flow due to burrs (28) on the outer folded edge (27) and the uneven thickness of the outer folded portion (25) of the outer folded portion (25) of the sealing material (12) are eliminated. The measurement accuracy of the sensor (9) can be increased.

(Invention of Claim 4)
The invention according to claim 4 has the following effects in addition to the effects of the invention according to any one of claims 1 to 3.
<Effect> The number of parts can be reduced.
As illustrated in FIGS. 1 (A) and 1 (B), the air purification introduction tube (16) is integrally formed with the air purification outlet pipe (8), so that the dedicated air purification introduction tube (16) becomes unnecessary, and the parts The score can be reduced.

1A and 1B are diagrams illustrating an air cleaner according to a first embodiment of the present invention, in which FIG. 1A is a longitudinal side view, and FIG. 1B is an enlarged view of an IB portion of FIG. 2A is a sectional view taken along line IIA-IIA in FIG. 1, FIG. 2B is a sectional view taken along line IIB-IIB in FIG. 1, and FIG. 2C is a sectional view taken along line IIC-IIC in FIG. FIGS. 3A and 3B are views illustrating an air cleaner according to a second embodiment of the present invention, in which FIG. 3A is a longitudinal side view, and FIG. 3B is an enlarged view of a IIIB portion of FIG. 4A is a cross-sectional view taken along line IVA-IVA in FIG. 3, FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. 3, and FIG. 4C is a cross-sectional view taken along line IVC-IVC in FIG. It is a figure explaining the air cleaner which concerns on 3rd Embodiment of this invention, FIG. 5 (A) is a vertical side view, FIG.5 (B) is the VB part enlarged view of FIG. 5 (A). 6A is a cross-sectional view taken along line VIA-VIA in FIG. 5, FIG. 6B is a cross-sectional view taken along line VIB-VIB in FIG. 5, and FIG. 6C is a cross-sectional view taken along line VIC-VIC in FIG.

  1 and 2 are diagrams for explaining an air cleaner according to a first embodiment of the present invention, FIGS. 3 and 4 are diagrams for explaining an air cleaner according to a second embodiment of the present invention, and FIGS. It is a figure explaining the air cleaner which concerns on 3rd Embodiment of this, Each embodiment demonstrates the air cleaner of an engine.

  As shown in FIGS. 1 (A) and 1 (B), a cylindrical inner filter element (22) is accommodated in a casing (1), and an uncleaned chamber (3) is provided around the inner filter element (22). The air purifying chamber (6) is provided at the center of the inner filter element (22), the air purifying outlet pipe (8) is led out from the casing end wall (7) to the end of the inner filter element (22). The air purifying outlet (10) is opened, the sealing material (12) is provided on the opening end surface (11a) of the air purifying outlet (10), the sealing material (12) is brought into contact with the contact portion (13), and the sealing is performed. The material (12) is provided with an inner folded portion (14) folded along the inner peripheral surface (11b) from the opening end surface (11a) of the purified air outlet (10), and the purified air outlet (10 of the filter element (22)) ) And the purified air inlet (15) of the purified air outlet pipe (8) are communicated with each other, and an air flow sensor (9) is disposed in the purified air outlet pipe (8).

As shown in FIGS. 2A and 2B, the casing (1) has a cylindrical shape.
A cylindrical outer filter element (21) concentric with the inner filter element (22) is disposed outside the inner filter element (22), and the outer filter element (21) and the inner filter element (22) are doubled. A tubular filter element (2) is constructed. The uncleaned chamber (3) is outside the outer filter element (21).
The outer filter element (21) is made of filter paper, and the inner filter element (22) is made of felt. The material of these filter elements may be other materials such as a sponge.

The unpurified chamber (3) is an unpurified swirl chamber, and as shown in FIG. 1, the end near the purified outlet pipe (8) is the start end (3a) and the opposite end is the end. (3b), and the unclean air inlet (5) faces the start end (3a). The starting end (3a) of the uncleaned chamber (3) is provided with a cylindrical uncleaned swivel guide tube (23) concentric with the outer filter element (21) and covering the outer filter element (21) from the outside. . As shown in FIG. 2 (A), the unclean air inlet (5) attached to the casing peripheral wall (4) is oriented in a direction along the tangential direction of the start end (3a) of the unclean air chamber (3). .
As shown in FIGS. 1 and 2C, the purified air outlet pipe (8) is an L-shaped elbow pipe. The air flow sensor (9) is attached to the peripheral wall of the purified gas outlet pipe (8), the portion near the purified gas inlet (20) in the direction parallel to the filter element (2). The airflow sensor (9) is a hot wire type. Another type of air flow sensor (9) may be used.
Based on the purified air flow rate measured by the air flow sensor (9), the engine ECU (not shown) adjusts the fuel injection amount of the common rail. Engine ECU is an abbreviation for engine electronic control unit.

As shown in FIGS. 1 (A), 2 (A) and 2 (B), the unpurified air (18) swirls in the uncleaned chamber (3), and the mass of uncleaned (18) increases in the process. The dust is centrifuged, and the unpurified air (18) passes through the filter element (2) from the unpurified chamber (3) to the purified air chamber (6). Dust is trapped by the filter element (2), and the unpurified air (18) becomes purified air (19) and flows into the clean air chamber (6). The purified air (16) in the purified air chamber (6) is sucked into the intake device of the engine from the purified air outlet pipe (8) through an intake duct (not shown) connected thereto.
In FIGS. 2 (A) and 2 (B), the direction of the clean air (19) passing through the clean air chamber (6) is facing forward, and in FIG. 2 (C), the clean air passing through the clean air outlet pipe (8). The direction of (19) is the back of the page.

A fitting part (24) is provided on the air purification inlet (15) side of the gas purification outlet pipe (8), and a sealing material (12) is provided on the opening end face of the gas purification outlet (10) of the inner filter element (22), The sealing material (12) is brought into contact with the contact portion (13), and the sealing material (12) is folded inward and outward along the inner peripheral surface (11b) and outer peripheral surface (11c) of the air purification outlet (10). The inner folded portion (14) and the outer folded portion (29) are formed, and the outer folded portion (29) of the sealing material (12) is fitted to the fitting portion (24).
This sealing material (12) is made of urethane foam, and burrs (28) are likely to occur on the inner and outer folded end edges (26) and (27) when the sealing material (12) is molded. The circumferential thickness of the folded portion (29) is also difficult to be constant.

  As shown in FIGS. 1 (A) and 1 (B), a purified air introduction tube (from the purified air inlet (15) of the purified gas outlet pipe (8) along the inside of the inner folded portion (14) of the sealing material (12) ( 16) is led out, and the lead-out end (17) of the air purification introduction tube (16) is located on the side of the air purification chamber (6) with respect to the inner folding end edge (26) of the inner folding portion (14) of the sealing material (12). It protrudes greatly.

As shown in FIGS. 1 (A) and 1 (B), the inner diameter of the passage from the air purification inlet (30) of the air purification introduction tube (16) to the mounting position of the air flow sensor (9) is the inner folded portion of the sealing material (12). It is squeezed smaller than the inner diameter of (14).
As shown in FIGS. 1 (A) and 1 (B), the lead-out end (17) of the air purification introduction tube (16) is more purified than the outer folded end edge (27) of the outer folded portion (25) of the sealing material (12). It protrudes greatly toward the air chamber (6).
As shown in FIGS. 1 (A) and 1 (B), the air purification introduction tube (16) is integrally formed with the air purification outlet pipe (8).

In the second embodiment shown in FIGS. 3 (A), 3 (B), 4 (A), 4 (B) and 4 (C), the air purification introduction tube (16) is separated from the air purification outlet pipe (8). The purifying introduction tube (16) is internally fitted in the purifying inlet portion (20) of the purifying outlet pipe (8).
Other structures and functions are the same as those of the first embodiment shown in FIGS. 1A, 1B, 2A, 2B, and 2C, and FIGS. In 4 (A), (B), and (C), the same elements as those in FIGS. 1 and 2A, 2B, and 2C are denoted by the same reference numerals.

In the third embodiment shown in FIGS. 5 (A), 5 (B), 6 (A), 6 (B) and 6 (C), the air purification introduction tube (16) is separated from the air purification outlet pipe (8). The purified air introduction tube (16) is fitted into the purified air inlet (15) of the purified air outlet pipe (8).
Other structures and functions are the same as those of the first embodiment shown in FIGS. 1A, 1B, 2A, 2B, and 2C, and FIGS. 6 (A), (B), and (C), the same elements as those in FIGS. 1 (A) and (B) and FIGS. 2 (A), (B), and (C) are denoted by the same reference numerals.

(1) Casing
(2) Tubular filter
(3) Uncleaned room
(4) Casing wall
(6) Clean room
(7) Casing end wall
(8) Air purification outlet pipe
(9) Air flow sensor
(10) Air purification outlet
(11a) Open end face
(11b) Inner peripheral surface
(12) Seal material
(13) Contact department
(14) Inner folded part
(15) Clean air inlet
(16) Air purification tube
(17) Outlet
(26) Inner folded edge of sealing material
(27) Outer folded edge of sealing material
(29) Outside fold of sealing material
(30) Clean air inlet of the clean air introducing cylinder

Claims (4)

A cylindrical filter element (22) is accommodated in the casing (1), an unpurified chamber (3) is provided around the filter element (22), and a purified chamber (6) is provided in the filter element (22). Provided, the purified air outlet pipe (8) is led out from the casing end wall (7), the purified air outlet (10) is opened at the end of the filter element (22), and the purified air outlet (10) is opened. A sealing material (12) is provided on the end surface (11a), the sealing material (12) is brought into contact with the contact portion (13), and the sealing material (12) is connected to the inside from the opening end surface (11a) of the purified air outlet (10). An inner folded portion (14) folded along the peripheral surface (11b) is provided, and the purified air outlet (10) of the filter element (22) communicates with the purified air inlet (15) of the purified air outlet pipe (8). In the air cleaner in which the air flow sensor (9) is disposed in the air purification outlet pipe (8),
A purified air introduction tube (16) is led out from the purified air inlet (15) of the purified air outlet pipe (8) along the inside of the inner folded portion (14) of the sealing material (12). The air cleaner is characterized in that the lead-out end (17) of the inner wall of the sealing material (12) protrudes more toward the clean chamber (6) than the inner turn-up edge (26) of the inner turn-up portion (14). In the air cleaner according to claim 1,
The inside diameter of the passage from the clean air inlet (30) of the clean air introduction tube (16) to the mounting position of the air flow sensor (9) is narrowed to be smaller than the inside diameter of the inner folded portion (14) of the sealing material (12). A featured air cleaner. In the air cleaner according to claim 1 or claim 2,
The lead-out end (17) of the air purification introduction tube (16) is made to protrude larger toward the air purification chamber (6) side than the outer folding end edge (27) of the outer folding portion (25) of the sealing material (12). An air cleaner characterized by In the air cleaner according to any one of claims 1 to 3,
An air cleaner characterized by integrally forming a clean air introduction tube (16) with a clean air outlet tube (8).

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