JP5520870B2 - Air purification device - Google Patents

Description

  The present invention relates to an air purification device, and more particularly, to an air purification device capable of predicting the influence of turbulence generated at a joint of filter elements on the measurement of the air flow sensor and improving the measurement accuracy of the air flow sensor. .

Conventionally, a cylindrical filter element is accommodated in an air cleaner casing, and an uncleaned chamber is provided around the filter element. There is an air purification device in which a clean air chamber is provided in a filter element and an air flow sensor is disposed downstream of the clean air chamber (see, for example, Patent Document 1).
According to this type of air purification device, there is an advantage that the flow rate of the purified air can be measured by the air flow sensor, and the adjustment of the combustion injection amount supplied to the purified air can be controlled.
However, in this type of air purifying apparatus, even when a filter element having a seam along the longitudinal direction is used at a predetermined position in the circumferential direction (see, for example, Patent Document 2), the filter element has an attitude that is independent of the position of the seam. There is a problem because it is assembled to the casing.

Japanese Patent Laying-Open No. 2004-124741 (see FIG. 1) JP 11-285609 A (see FIG. 1)

<Problem> The measurement accuracy of the air flow sensor is low.
Even when a filter element having a seam along the longitudinal direction is used at a predetermined position in the circumferential direction, the filter element is assembled to the casing in a posture unrelated to the position of the seam, so the seam between the filter element and the air flow sensor The relative position is not constant, the influence of turbulence generated at the joint of the filter element on the measurement of the air flow sensor cannot be predicted, and the measurement accuracy of the air flow sensor is low.

  An object of the present invention is to provide an air purifier that can increase the measurement accuracy of an air flow sensor by predicting the influence of turbulence generated at the joint of filter elements on the measurement of the air flow sensor.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1A, a cylindrical filter element (22) is accommodated in a casing (1) of an air cleaner (31), and an uncleaned chamber (3) is provided around the filter element (22). . In the air purification apparatus in which the air purification chamber (6) is provided in the filter element (22), and the air flow sensor (9) is arranged downstream of the air purification chamber (6),
In using a filter element (22) having a seam (22a) along the longitudinal direction at a predetermined position in the circumferential direction,
As illustrated in FIGS. 2C and 2D and FIGS. 3A to 3D, the filter element (22) and the casing (1) are positioned in the circumferential direction of the filter element (22) on the casing (1) side (35). ), And the seam (22a) of the filter element (22) is aligned with a predetermined position of the casing (1) by the positioning means (35), thereby the seam (22a) of the filter element (22). And the air flow sensor (9) are aligned at a predetermined relative position ,
As illustrated in FIGS. 2C and 2D, the filter element (22) has a multilayer structure of a plurality of layers (32), (33), and (34), and a plurality of seams (22a) of the filter element (22). In the case of a combination of the seams (32a) (33a) (34a) of the layers (32) (33) (34) of
Among the joints (32a) (33a) (34a) of the plurality of layers (32) (33) (34), some of the joints (32a) (33a) are located at predetermined positions in the circumferential direction of the filter element (22). The remaining seams (34a) are arranged at other predetermined positions in the circumferential direction of the filter element (22), and the partial seams (32a) (33a) and the remaining seams (34a) are connected to the purification chamber. An air purification device, characterized in that the air purification device is disposed on opposite sides of the center portion (6a) of (6).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> The measurement accuracy of the air flow sensor can be increased.
2 (C) (D), as illustrated in FIGS. 3 (A) to (D) , when using a filter element (22) having a seam (22a) along the longitudinal direction at a predetermined position in the circumferential direction, The element (22) and the casing (1) are provided with a circumferential alignment means (35) for the filter element (22), and the seam (22a) of the filter element (22) is connected to the casing (35) by this alignment means (35). 1) Since the seam (22a) of the filter element (22) and the air flow sensor (9) are aligned at a predetermined relative position by aligning with a predetermined position on the side, The influence of the turbulent flow generated at the joint (22a) of the filter element (22) on the measurement of the air flow sensor (9) can be predicted, and the measurement accuracy of the air flow sensor (9) can be improved.
<Effect> The measurement accuracy of the air flow sensor can be increased.
As illustrated in FIGS. 2C and 2D, the filter element (22) has a multilayer structure of a plurality of layers (32), (33), and (34), and a plurality of seams (22a) of the filter element (22). When the layers (32), (33), and (34) have a combination of the seams (32a), (33a), and (34a), the seams (32a) and (33a) of these layers (32), (33), and (34) ) (34a) are arranged in a predetermined relative position to each other, so that the seams (32a) (33a) (34a) of the plurality of layers (32) (33) (34) of the filter element (22) and The air flow sensor (9) is set in a predetermined relative relationship, and the turbulence generated at the joints (32a) (33a) (34a) of the plurality of layers (32) (33) (34) is measured by the air flow sensor (9). Can be predicted, and the measurement accuracy of the airflow sensor (9) can be increased.
<Effect> The measurement accuracy of the air flow sensor can be increased.
As illustrated in FIGS. 2C and 2D, some of the joints 32 a, 33 a, 34 a among the joints 32 a, 33 a, 34 a of the plurality of layers 32, 33, 34 are provided. Are arranged at predetermined positions in the circumferential direction of the filter element (22), the remaining seams (34a) are arranged at other predetermined positions in the circumferential direction of the filter element (22), and the partial seams (32a) (33a) are arranged. ) And the remaining seam (34a) are arranged on opposite sides of the central portion (6a) of the purification chamber (6), so that the seams of the plurality of layers (32), (33), (34) ( 32a) (33a) (34a) where turbulent flow points are dispersed at positions farthest from each other, and are generated at the joints (32a) (33a) (34a) of the plurality of layers (32) (33) (34) Amplification due to mutual interference of the turbulent flow is suppressed, and the turbulent flow generated at the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) affects the measurement of the air flow sensor (9). More predictable Hibiki, it is possible to increase the measurement accuracy of the air flow sensor (9).

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The seam of the filter element can be accurately aligned with a predetermined position of the casing.
As illustrated in FIGS. 2C and 3D or FIGS. 3A to 3C, the positioning means 35 includes a locking portion 36 and an engaging portion 37, so that the filter The seam (22a) of the element (22) can be accurately aligned with a predetermined position of the casing (1).

(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.
<Effect> The joint of the filter element can be aligned with a predetermined position of the casing by simple means.
As illustrated in FIG. 3D, since the positioning means (35) includes a pair of alignment marks (38) and (39), the joint (22a) of the filter element (22) is connected to the casing (1) in advance. It is possible to align with a predetermined position by simple means.

It is a figure explaining the air purification apparatus which concerns on embodiment of this invention, FIG. 1 (A) is a vertical side view of an air cleaner, FIG.1 (B) is an enlarged view of the B arrow part of FIG. 1 (A). 2A and 2B are views for explaining the relative positions of the seam of the filter element and the air flow sensor used in the air purification device of FIG. 1, FIG. 2A is an explanatory diagram of a reference example of seam arrangement , and FIG. 2B is FIG. Fig. 2 (C) is an explanatory diagram of an embodiment of the joint arrangement , and Fig. 2 (D) is an enlarged view of the portion D in Fig. 2 (C). FIG. 3 is a diagram for explaining the alignment means used in the air purifying apparatus of FIG. 1, and FIGS. 3A to 3C are enlarged views of a section taken along the line IIIA in FIG. 1A showing a first embodiment of the alignment means ; FIG. 3 (B) Figure 3 B arrow view of (a), FIG. 3 (C) is a view seen in the arrow C of FIG. 3 (a), the diagram of a second embodiment of FIG. 3 (D) is alignment means FIG. 3C is an equivalent diagram. 4A is a cross-sectional view taken along line IVA-IVA in FIG. 1, FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. 1, and FIG. 4C is a cross-sectional view taken along line IVC-IVC in FIG.

  1-4 is a figure explaining the air purification apparatus which concerns on embodiment of this invention, and this embodiment demonstrates the air purification apparatus of an engine.

  As shown in FIG. 1A, a cylindrical inner filter element (22) is accommodated in a casing (1) of an air cleaner (31), and an uncleaned chamber (3) is placed around the inner filter element (22). Establishment. A clean air chamber (6) is provided in the filter element (22), and an air flow sensor (9) is disposed downstream of the clean air chamber (6).

As shown in FIGS. 4A and 4B, 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 mainly made of felt. The material of these filter elements may be other materials such as a sponge.

  As shown in FIG. 1 (A), the unpurified chamber (3) is an unpurified swirl chamber, the end near the purified outlet pipe (8) is the start end (3a), and the opposite end. Is the end portion (3b), and the unclean air inlet (5) faces the start end portion (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 to FIG. 4 (A), the unclean air inlet (5) attached to the casing surrounding wall (4) is orientated in the direction along the tangential direction of the start end part (3a) of the unclean air chamber (3). .

  As shown in FIG. 1 (A), 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 inner filter element (22), As shown in FIG. 1 (B), a sealing material (12) is provided on the opening end surface (11a) of the air purifying outlet (10), and the sealing material (12) is brought into contact with the contact portion (13) to seal the seal. 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. 1 (A) and 4 (C), 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), 4 (A) and 4 (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. The air flow sensor (9) may be disposed in the exhaust duct when the relative position of the air cleaner (31) with respect to the casing (1) is predetermined.
In FIGS. 4 (A) and 4 (B), the direction of the purified air (19) passing through the purified air chamber (6) is facing forward, and in FIG. 4 (C), the purified air passing through the purified air outlet pipe (8). The direction of (19) is the back of the page.

In the reference example of the seam arrangement shown in FIGS. 2 (A) and 2 (B) and the example of the seam arrangement shown in FIGS. 2 (C) and 2 (D), a seam (22a) along the longitudinal direction is provided at a predetermined position in the circumferential direction. When the inner filter element (22) is used, the inner filter element (22) and the casing (1) are provided with circumferentially aligning means (35) of the filter element (22). By aligning the seam (22a) of the filter element (22) with a predetermined position of the casing (1), the seam (22a) of the inner filter element (22) and the air flow sensor (9) are predetermined. The relative position is set.

As shown in FIGS. 3 (A) to 3 (C), the first embodiment of the positioning means (35) includes an engaging portion (36) and an engaging portion (37). The locking portion (36) is a notch on the casing (1) side, and the engaging portion (37) is a protrusion on the inner filter element (22) side.

As shown in FIG. 3D, a pair of alignment marks (38) and (39) can be used as a modification of the alignment means (35). This is a second embodiment of the alignment means (35). The alignment marks (38) and (39) are displayed on the casing (1) side and the inner filter element (22) side, respectively.

In the reference example of the seam arrangement shown in FIGS. 2 (A) and 2 (B) and the embodiment of the seam arrangement shown in FIGS. 2 (C) and 2 (D), the inner filter element (22) has a plurality of layers (32), (33) ( 34), the seam (22a) of the inner filter element (22) is a combination of seams (32a) (33a) (34a) of a plurality of layers (32) (33) (34), and these The seams (32a), (33a), and (34a) of the plurality of layers (32), (33), and (34) are disposed at predetermined relative positions.
The inner filter element (22) consists of three layers: an inner layer (34), an intermediate layer (33), and an outer layer (32). The inner layer (34) is a shape-retaining layer in which a metal mesh sheet is formed into a cylindrical shape, and the seam (34a) is welded by abutting the sheet edge. The intermediate layer (33) is a filtration layer in which a felt sheet is formed in a cylindrical shape along the outer periphery of the inner layer (34), and the end of the sheet is abutted at the joint (33a). The outer layer (32) is a fixed layer that covers the intermediate layer (33) from the outer periphery and is fixed to the inner layer (34), and at the joint (32a), the sheet ends are overlapped and heat-welded.

As shown in FIGS. 2A and 2B, in the reference example of the arrangement of the seams (32a) (33a) (34a) of the plurality of layers (32) (33) (34), the plurality of layers (32) ( All of the joints (32a), (33a) and (34a) of (33) and (34) are arranged so as to overlap at a predetermined position in the circumferential direction of the filter element (22).
In the reference example of this joint arrangement shown in FIGS. 2 (A) and 2 (B), the turbulent flow generated by the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) is the filter element. The turbulent flow generated at the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) affects the measurement of the air flow sensor (9). The influence can be easily predicted, and the measurement accuracy of the air flow sensor (9) can be increased.

In the embodiment of the seam arrangement shown in FIGS. 2C and 2D , among the seams (32a) (33a) (34a) of the plurality of layers (32), (33) and (34), the outer layer (32) and the intermediate layer (32) are intermediate. The seam (32a) (33a) of the layer (33) is disposed at a predetermined position in the circumferential direction of the filter element (22), and the seam (34a) of the inner layer (34) is another predetermined in the circumferential direction of the filter element (22). The seam (32a) (33a) of the outer layer (32) and the intermediate layer (33) and the seam (34a) of the inner layer (34) sandwich the central part (6a) of the purification chamber (6). They are arranged on opposite sides.

As shown in FIG. 1 (B), a fitting part (24) is provided on the side of the air purification inlet (15) of the air purification outlet pipe (8), and the opening of the air purification outlet (10) of the inner filter element (22). A sealing material (12) is provided on the end surface, the sealing material (12) is brought into contact with the contact portion (13), and the sealing material (12) is connected to the inner peripheral surface (11b) and the outer peripheral surface of the purified air outlet (10). The inner folded portion (14) and the outer folded portion (29) are formed by folding inward and outward along (11c), 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 a result, the inner folded end edge (26) of the inner folded portion (14) of the sealing material (12) is covered from the inner side with the purified air introduction tube (16), and the inner folded end edge (26) of the sealing material (12). The generation of turbulent flow due to the burr (28) can be eliminated, and the measurement accuracy of the air flow sensor (9) can be improved.

  Further, as shown in FIGS. 1 (A) and 1 (B), the inner diameter of the passage from the purification inlet (30) of the purification inlet cylinder (16) to the mounting position of the air flow sensor (9) is set inside the sealing material (12). It is squeezed smaller than the inner diameter of the folded portion (14). Thereby, even when a turbulent flow is generated upstream of the purified air introduction cylinder (16), the turbulent flow is rectified by the throttling action of the purified air introduction cylinder (16), and the turbulent flow gives the measurement of the air flow sensor (9). The influence can be reduced and the measurement accuracy of the air flow sensor (9) can be increased.

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 a result, the outer folded end edge (27) of the outer folded portion (25) of the sealing material (12) is covered with the purified air introduction tube (16) from the inside, and the outer folded portion (25) of the sealing material (12) is covered. It is possible to improve the measurement accuracy of the air flow sensor (9) by eliminating the uneven thickness in the circumferential direction and the occurrence of turbulent flow due to the burr (28) of the outer folded edge (27).
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). This eliminates the need for the dedicated air purification introduction cylinder (16), and can reduce the number of parts.

(1) Casing
(3) Uncleaned room
(6) Clean room
(9) Air flow sensor
(22) Inner filter element
(22a) Seam
(31) Air cleaner
(32) Outer layer
(32a) Seam
(33) Middle layer
(33a) Seam
(34) Inner layer
(34a) Seam
(35) Positioning means
(36) Locking part
(37) Engagement part
(38) Match mark
(39) Match mark

Claims (3)

A cylindrical filter element (22) is accommodated in a casing (1) of an air cleaner (31), an uncleaned chamber (3) is provided around the filter element (22), and a purified chamber is provided in the filter element (22). (6) In the air purification apparatus which provided the airflow sensor (9) downstream of the air purification chamber (6),
In using a filter element (22) having a seam (22a) along the longitudinal direction at a predetermined position in the circumferential direction,
The filter element (22) and the casing (1) side are provided with a circumferential alignment means (35) of the filter element (22), and the seam (22a) of the filter element (22) is connected to the casing by the alignment means (35). By aligning at a predetermined position of (1), the seam (22a) of the filter element (22) and the air flow sensor (9) are aligned at a predetermined relative position ,
The filter element (22) has a multilayer structure of a plurality of layers (32), (33) and (34), and the seam (22a) of the filter element (22) is a seam of the plurality of layers (32), (33) and (34) ( 32a) (33a) (34a)
The seams (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) are arranged at predetermined relative positions to each other,
Among the joints (32a) (33a) (34a) of the plurality of layers (32) (33) (34), some of the joints (32a) (33a) are located at predetermined positions in the circumferential direction of the filter element (22). The remaining seams (34a) are arranged at other predetermined positions in the circumferential direction of the filter element (22), and the partial seams (32a) (33a) and the remaining seams (34a) are connected to the purification chamber. An air purification device, characterized in that the air purification device is disposed on opposite sides of the center portion (6a) of (6). The air purifier according to claim 1,
The air purifying apparatus according to claim 1, wherein the positioning means (35) includes a locking part (36) and an engaging part (37). The air purifier according to claim 1,
The air purifying apparatus, wherein the positioning means (35) includes a pair of alignment marks (38) and (39).

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