JP2012215094A - Air cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaning device, in which influences of turbulence produced at a seam of a filter element on the measurement by an air flow sensor can be predicted, and thereby, the measurement accuracy of the air flow sensor can be improved.SOLUTION: Upon using a filter element 22 having a seam 22a along a longitudinal direction at a predetermined position in a circumference direction, the filter element 22 and a casing are provided with a positioning means 35 in the circumference direction of the filter element 22. By preliminarily aligning the seam 22a of the filter element 22 to a predetermined position of the casing by the positioning means 35, the seam 22a of the filter element 22 and the air flow sensor 9 can be arranged at preliminarily determined relative positions.

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) Japanese Patent Laid-Open No. 11-285609 (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. 2A and 2B, the filter element (22) and the casing (1) are provided with circumferentially aligning means (35) for the filter element (22), and the aligning means (35 ), The seam (22a) of the filter element (22) and the air flow sensor (9) are predetermined by aligning the seam (22a) of the filter element (22) with a predetermined position of the casing (1). An air purifying device characterized by being aligned with a relative position.

(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.
As illustrated in FIGS. 2A and 2B, in using the 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 are used. A circumferentially aligning means (35) of the filter element (22) is provided on the side, and the seam (22a) of the filter element (22) is set at a predetermined position on the casing (1) side by the aligning means (35). Since the seam (22a) of the filter element (22) and the air flow sensor (9) are aligned at a predetermined relative position, the seam (22a) of the filter element (22) is aligned. ) Can be predicted to affect the measurement of the air flow sensor (9), 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 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. 2A and 2B 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.

(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 measurement accuracy of the air flow sensor can be increased.
As illustrated in FIGS. 2A and 2B, 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.

(Invention according to claim 5)
The invention according to claim 5 has the following effect in addition to the effect of the invention according to claim 4.
<Effect> The measurement accuracy of the air flow sensor can be increased.
As illustrated in FIG. 2A, all of the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) are overlapped at a predetermined position in the circumferential direction of the filter element (22). Therefore, the turbulent flow generated by the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) is gathered at one place in the circumferential direction of the filter element (22). The influence of the turbulent flow generated at the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) on the measurement of the airflow sensor (9) can be easily predicted, and the airflow sensor (9 ) Measurement accuracy can be increased.

(Invention of Claim 6)
The invention according to claim 6 has the following effect in addition to the effect of the invention according to claim 4.
<Effect> The measurement accuracy of the air flow sensor can be increased.
As illustrated in FIG. 2B, among the seams (32a) (33a) (34a) of the plurality of layers (32) (33) (34), some seams (32a) (33a) are filter elements. (22) is disposed at a predetermined position in the circumferential direction, and the remaining seam (34a) is disposed at another predetermined position in the circumferential direction of the filter element (22), and the part of the seams (32a) (33a) and the rest The seam (34a) of the plurality of layers (32), (33), and (34) are arranged on opposite sides of the central part (6a) of the purification chamber (6). The turbulent flow generated by the joints (32a), (33a), and (34a) of the plurality of layers (32), (33), and (34) are dispersed at positions farthest from each other. Of the turbulent flow generated at the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) on the measurement of the air flow sensor (9). Predicted easily, it is possible to improve the measurement accuracy of the air flow sensor (9).

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 diagrams 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 basic example, and FIG. 2B is an arrow B of FIG. FIG. 2C is an explanatory diagram of a modified example, and FIG. 2D is an enlarged view of a portion indicated by an arrow D in FIG. 2C. FIGS. 3A to 3C are basic examples of the alignment means used in the air purifying apparatus of FIG. 1, and FIG. FIG. 3A is a view taken in the direction of arrow B, FIG. 3C is a view taken in the direction of arrow C in FIG. 3A, and FIG. 3D is a view corresponding to FIG. 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.

  As shown in FIGS. 2 (A) and 2 (B), when using the inner filter element (22) having a seam (22a) along the longitudinal direction at a predetermined position in the circumferential direction, the inner filter element (22) and the casing (1 ) Side is provided with a circumferential positioning means (35) of the filter element (22), and the seam (22a) of the inner filter element (22) is predetermined by the positioning means (35) of the casing (1). By aligning with the position, the joint (22a) of the inner filter element (22) and the air flow sensor (9) are positioned at a predetermined relative position.

  As shown in FIGS. 2A and 2B or FIGS. 3A to 3C, the basic example of the positioning means (35) includes a locking 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). The alignment marks (38) and (39) are displayed on the casing (1) side and the inner filter element (22) side, respectively.

As shown in FIGS. 2 (A) and 2 (B), the inner filter element (22) has a multilayer structure of a plurality of layers (32), (33) and (34), and the seam (22a) of the inner filter element (22) is formed. It consists of a combination of seams (32a) (33a) (34a) of a plurality of layers (32) (33) (34), and seams (32a) (33a) of these layers (32) (33) (34) (34a) are arranged 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).

  As shown in FIG. 2A, in the basic example of the arrangement of the seams (32a) (33a) (34a) of the plurality of layers (32) (33) (34), the plurality of layers (32) (33) ( 34) all of the joints (32a), (33a), and (34a) are arranged so as to overlap at a predetermined position in the circumferential direction of the filter element (22).

  In the modification shown in FIG. 2 (B), the joint between the outer layer (32) and the intermediate layer (33) among the joints (32a) (33a) (34a) of the plurality of layers (32) (33) (34). (32a) (33a) is arranged at a predetermined position in the circumferential direction of the filter element (22), and a joint (34a) of the inner layer (34) is arranged at another predetermined position in the circumferential direction of the filter element (22), and the outer layer (32), the seam (32a) (33a) of the intermediate layer (33) and the seam (34a) of the inner layer (34) are arranged on opposite sides of the center (6a) of the purification chamber (6). ing.

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 (6)

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,
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). (1) By aligning with the predetermined position of the filter element (22), the seam (22a) of the filter element (22) and the air flow sensor (9) are aligned with the predetermined relative position. An air purifier and a stand characterized by. 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). In the air purification apparatus according to any one of claims 1 to 3,
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)
An air purifier characterized in that the seams (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) are arranged at predetermined relative positions. In the air purification apparatus according to claim 4,
All of the joints (32a), (33a) and (34a) of the plurality of layers (32), (33) and (34) are arranged to overlap each other at a predetermined position in the circumferential direction of the filter element (22). Air purification device to do. In the air purification apparatus according to claim 4,
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).

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