JPH1190148A - Air cleaner for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress noise at the communicating part between the scroll outlet of a scroll chamber and a filter chamber. SOLUTION: The opening of the scroll outlet 8 of this air cleaner for an automobile is gradually throttled from the inner part of a scroll chamber 6 by a circular slope 16 constituting one side of the scroll outlet 8 of the scroll chamber 6 and extended from the tip of a nose 10 demarcating a nozzle inlet 7 and a filter chamber 9, hence a rapid pressure change at the scroll outlet 8 is suppressed, and the air current flows into the filter chamber 9 along the curved and expanded face 17 of a ventilating guide on the rear of the slope 16. Consequently, a turbulent flow is not generated, a rapid pressure change is suppressed, and further noise is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air purifier which is mounted on a rear parcel shelf at the rear of a vehicle compartment to purify air in the vehicle compartment.

[0002]

2. Description of the Related Art Some air purifiers for automobiles include, for example, JP-A-4-222615 and JP-A-4-131115.
As shown in the publication, the filter is placed horizontally adjacent to the fan in the case, the height of the case is made as small as possible, and the installation space in the up and down direction in the vehicle interior is reduced as much as possible. What is made known is known.

As shown in FIG. 4, an intake port 31 and an exhaust port 32 are formed on the upper wall of a case 30 adjacent to each other, and a scroll chamber 3 in which a fan 33 is disposed below the intake port 31.
4, a filter chamber 35 communicating with a scroll outlet 34b of the scroll chamber 34 is formed below the exhaust port 32, and a filter 36 is disposed horizontally in the filter chamber 35.

[0004] As the fan 31, a centrifugal multi-blade fan having a plurality of blades in the circumferential direction and taking air in the fan axial direction from the intake port 31 and blowing it out radially from between the blades is used. The scroll entrance 34a having a small passage cross-sectional area at the beginning of the scroll winding of the scroll chamber 34 and a scroll exit 34b having a large passage cross-sectional area.
, The pressure of the intake air is increased to flow from the scroll outlet portion 34b into the filter chamber 35 below the filter 36, pass through the filter 36, and
The air is cleaned from the air discharged from the air outlet 2.

[0005] At the boundary between the scroll chamber 34 and the filter chamber 35 of the case 30, it is formed so as to protrude inward from one side of the case 30, and constitutes one side of the scroll outlet 34b. A nose portion 37 that separates from the filter chamber 35 is formed.

[0006]

As described above, the case 3
At the boundary between the zero scroll chamber 34 and the filter chamber 35,
Nose part 37 which constitutes one side of scroll exit part 34b
Are formed so as to rise vertically, so that a rapid pressure change is likely to occur in the communication portion between the scroll outlet portion 34b and the filter chamber 35, and the scroll outlet portion 34b is formed.
When air flows from b into the filter chamber 35, a wind breaking phenomenon easily occurs in the nose portion 37, so that noise may increase.

In view of the above, according to the present invention, by appropriately configuring the nose portion, it is possible to suppress the occurrence of a sudden pressure change at the scroll outlet portion, and to suppress the wind breaking phenomenon at the nose portion, thereby reducing noise. It is intended to provide an automotive air purifier capable of reducing the air pollution.

[0008]

According to the first aspect of the present invention, a scroll chamber in which an intake port and an exhaust port are formed adjacent to an upper wall of a case, and a fan is disposed below the intake port. On the other hand, a filter chamber communicating with the scroll outlet of the scroll chamber is formed below the exhaust port, and the filter is disposed horizontally in the filter chamber, and the air sucked from the intake port by the fan is used for the scroll chamber. Through the scroll outlet from the scroll outlet to the lower side of the filter of the filter chamber, and through the filter and exhausted from the exhaust port to perform an air purifying operation of the air, for an automotive air purifier, One side of the scroll outlet portion of the scroll chamber, the nose portion separating the scroll inlet portion and the filter chamber, the peripheral wall of the scroll inlet portion from the tip of the nose portion A ramp having a ventilation guide surface that is formed in an arc shape whose height is gradually reduced and that is gradually reduced in height, is connected to the bottom of the scroll chamber, and curves and expands to the side face on the filter chamber side. It is characterized in that a part is formed.

According to the second aspect of the present invention, the nose portion according to the first aspect is formed on the side surface on the filter chamber side so as to extend into the filter chamber so as to be continuous with the ventilation guide surface of the slope portion. It is characterized in that a shelf for fixing one side is formed.

According to the third aspect of the present invention,
The fan arranged in the scroll chamber described in (1) is provided with a plurality of blades arranged in a circumferential direction, and is provided at the upper end side of the blades, and is inclined substantially along the blowing angle of the air flowing out from between the blades. A shroud and a bottom plate provided on the lower end side of the blade, and the inner surface of the upper wall of the scroll chamber is formed so that the scroll inlet side is steeply inclined at substantially the same angle as the shroud, and the scroll outlet side is located on the scroll outlet side. It is characterized in that it is formed by gradually changing to a steep inclination gradually as it reaches.

[0011]

According to the first aspect of the present invention, the slope portion extending from the tip of the nose portion extends substantially on the extension of the curved surface of the peripheral wall of the scroll entrance portion, and the height gradually decreases. Since the scroll outlet is formed so as to be continuous with the bottom of the scroll chamber, the scroll outlet is gradually opened from the inner portion of the scroll chamber near the scroll outlet by the arc-shaped slope. As a result, a rapid change in pressure is suppressed at the communication portion between the scroll outlet and the filter chamber.

Further, since the side surface of the slope portion on the filter chamber side is a curved and bulging ventilation guide surface, the air flow flowing into the filter chamber from the scroll outlet portion on one side of the scroll outlet portion is reduced. Since the air flows along the curved surface of the ventilation guide surface, it is possible to avoid the occurrence of the phenomenon of air flow separation due to the generation of turbulence downstream of the nose portion, and as a result, the scroll outlet Noise can be significantly reduced in combination with the ability to suppress sudden pressure changes in the part.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the effect of the invention of the invention, since the shelf on which one side of the filter is fixed is formed so as to be connected to the ventilation guide surface of the slope portion and protrude into the filter chamber, a dedicated support member for the filter is provided in the filter chamber. Unlike those provided, the shelves do not become a source of turbulent flow and a flow resistance of the airflow flowing into the filter chamber from the scroll outlet, and therefore, the filter does not involve a reduction in air volume or noise. Can be securely fixed in place.

According to the third aspect of the invention, in addition to the effects of the first and second aspects, when the centrifugal multi-blade fan is used as the fan, the inner surface of the upper wall of the scroll chamber is entirely covered. Even if the air is formed at substantially the same angle as the shroud at the upper end of the blade and air is to be rectified, the air blown from between the blades based on the law of conservation of angular momentum between the shroud and the inner surface of the upper wall of the scroll chamber. Although the air volume loss occurs due to the secondary vortex generated in the direction opposite to the flow, the scroll inlet side of the upper wall of the scroll chamber is made almost the same steep slope as the shroud, and gradually becomes gradually gentler as it reaches the scroll outlet side. The scroll chamber on the side of the scroll outlet is compared with a scroll chamber on the side of the scroll outlet which is formed as the inner surface of the upper wall having the same steep slope as the scroll inlet. Since the internal pressure is raised area is increased, it is possible to reduce the air volume loss due to collision with the 2 Tsugiuzu as possible.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a resin case formed in a substantially rectangular plane, and is composed of an upper case 2 and a lower case 3. These upper case 2 and lower case 3
Are detachably fastened and fixed at their four corners by fastening means such as screws.

An intake port 4 and an exhaust port 5 are formed adjacent to the upper wall 2a of the upper case 2.

A scroll chamber 6 in which a fan 11 is disposed is formed below the intake port 4 of the case 1, while a scroll outlet section 8 of the scroll chamber 6 is formed below the exhaust port 5.
The filter chamber 9 communicates with the filter chamber 9 and the filter 15 is disposed horizontally in the filter chamber 9.
As a result, the air sucked from the intake port 4 flows through the scroll chamber 6 from the scroll outlet section 8 to the lower side of the filter 15 in the filter chamber 9, passes through the filter 15, and is discharged from the exhaust port 5, whereby the air is discharged. The cleaning action is performed.

As the fan 11, a plurality of blades 12 arranged in a row in the circumferential direction, and an angle θ ₁ provided at the upper end side of the blades 12 and substantially along the blowing angle of the air flow A flowing out between the blades 12 are provided. Shroud 13 inclined by molding
And a bottom plate 14 provided on the lower end side of the blade 12.
And a centrifugal multi-blade fan having the following.

The inside of the case 1 is formed so as to protrude inward from one side wall thereof to form one side of a scroll outlet portion 8 of the scroll chamber 6.
A nose portion 10 that separates the filter entrance 9 from the scroll entrance 7 at the beginning of the scroll winding is formed.

The nose portion 10 is formed with a slope portion 16 which extends from the tip of the nose portion substantially over the curved surface of the peripheral wall 6a of the scroll entrance portion 7.

The slope portion 16 is formed in an arc shape with a gradually decreasing height, and its tip is connected to the bottom of the scroll chamber 6.

The rear surface of the slope portion 16, that is, the side surface on the filter chamber 9 side is formed as a curved and expanded ventilation guide surface 17.

Further, on the side surface of the nose portion 10 on the filter chamber 9 side, a shelf 18 is formed so as to extend into the filter chamber 9 so as to be continuous with the ventilation guide surface 17 of the slope portion 16. The side portion is placed on the shelf 18 so that the filter 15 can be placed and fixed in the filter chamber 9 obliquely.

On the other hand, the edge of the intake port 4 is
1 is formed as a bell mouth 4a surrounding a flange 13a formed upright on the inner peripheral edge of the shroud 13, and an upper wall inner surface 19 of the scroll chamber 6 following the bell mouth 4a is an upper wall inner surface of the scroll inlet portion 7 side. 19a together with formed by steep and shroud 13 substantially at the same angle theta _1, so that the inclination angle theta ₂ of the scroll outlet section 8 side of the upper wall inner surface 19b becomes gentle gradually according leads to the upper wall inner surface 19b It is formed by gradually changing to a gentle slope.

In the drawing, reference numeral 20 denotes a filter insertion port provided on one side of the filter chamber 15, which is normally closed by a detachable lid (not shown). Forms a support seat 21 which cooperates with the shelf 18 to position one side of the filter 15.

According to the structure of the above-described embodiment, the slope portion 16 extending from the tip of the nose portion 10 extends substantially on the curved surface of the peripheral wall 6a of the scroll entrance portion 7, and
The scroll outlet portion 8 is formed by the arc-shaped slope portion 16 so that the scroll outlet portion 8 is substantially scrolled. The opening is gradually narrowed from a deep portion near the outlet portion 8, and a rapid change in pressure is suppressed at a communication portion between the scroll outlet portion 8 and the filter chamber 9.

Moreover, the filter chamber 9 of the slope section 16
The side surface is formed as a curved and expanded ventilation guide surface 17, so that on one side of the scroll outlet 8, the airflow flowing from the scroll outlet 8 into the filter chamber 9 is
As shown by the arrow in FIG. 1, the air flows along the curved surface of the ventilation guide surface 17, and no turbulence is generated on the downstream side of the back surface of the nose portion 10. Therefore, the turbulence is generated. Therefore, it is possible to avoid the occurrence of the separation phenomenon of the air flow due to the above.

As a result, noise can be significantly reduced in combination with the suppression of the rapid pressure change at the scroll outlet section 8, and the sense of quality and reliability can be further enhanced.

According to this embodiment, the shelf 18 on which one side of the filter 15 is fixed is formed so as to extend into the filter chamber 9 so as to be continuous with the ventilation guide surface 17 of the slope 16. Unlike the case where a dedicated filter support member is provided in the filter chamber 9, the shelf 18
Does not become a source of turbulence or a flow resistance of the airflow flowing into the filter chamber 9 from the scroll outlet portion 8, and therefore, securely fixes the filter 15 in place without reducing the air volume or generating noise. can do.

On the other hand, when a centrifugal multi-blade fan is used as the fan 11 as in the present embodiment, the inner wall 19 of the upper wall of the scroll chamber 6 is moved to the upper wall of the scroll inlet 7 as shown by a chain line in FIG. very attempt made an overall tilt forming to rectification of air a blowing approximately the same angle theta ₁ with the shroud 13 to extend from the inner surface 19a in the upper wall inner surface 19b of the scroll outlet section 8 side, the shroud 13 and the scroll chamber 6 The secondary vortex a generated in the opposite direction to the airflow A blown out from between the blades 12 on the basis of the law of conservation of angular momentum between the upper wall inner surface 19 and the upper wall inner surface 19 causes a loss of air volume.
Upper wall inner surface 19 of the upper wall inner surface 19 on the scroll entrance 7 side
a is a steeply inclined surface which is substantially the same as the inclination angle θ ₁ of the shroud 13, and the upper wall inner surface 19 b of the scroll outlet portion 8 is formed on the scroll outlet portion 8 so that the upper wall inner surface 19 b becomes a gentle slope with a smaller angle θ _2. The inner surface 19b of the scroll outlet 8 is gradually changed to a gradual inclination gradually toward the inner surface 19b of the upper wall.
As compared with the case of the same steep slope as that of a, the cross-sectional area of the scroll chamber 6 on the scroll outlet portion 8 side is increased and the internal pressure is increased, so that the air volume loss due to the collision with the secondary vortex a is reduced as much as possible. Can be smaller.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of the upper case of the embodiment as viewed from below.

FIG. 3 is a sectional view of a scroll chamber portion of the embodiment.

FIG. 4 is a plan view showing a conventional structure.

[Explanation of symbols]

 Reference Signs List 1 case 4 intake port 5 exhaust port 6 scroll chamber 6a peripheral wall 7 scroll inlet section 8 scroll outlet section 9 filter chamber 10 nose section 11 fan 12 blade 13 shroud 14 bottom plate 15 filter 16 slope section 17 ventilation guide surface 18 shelf section 19 scroll Inside the upper wall of the room

Claims (3)

[Claims] An intake port (4) and an exhaust port (5) are formed adjacent to an upper wall (2a) of a case (1), and a fan (11) is arranged below the intake port (4). While the scroll chamber (6) provided is formed, a filter chamber (9) communicating with the scroll outlet (8) of the scroll chamber (6) is formed below the exhaust port (5) to form the filter chamber (9). ), A filter (15) is arranged horizontally, and the air sucked from the intake port (4) by the fan (11) passes through the scroll chamber (6) and from the scroll outlet (8) to the filter chamber (9). ), The air is purified by passing through the filter (15), passing through the filter (15), and discharging from the exhaust port (5). Scroll room (6)
Of the scroll outlet portion (8), and a nose portion (10) separating the scroll inlet portion (7) and the filter chamber (9) from the tip of the nose portion (10). The peripheral wall (6a) of (7) extends substantially over the curved surface, is formed in an arc shape with a gradually decreasing height, and its tip is connected to the bottom of the scroll chamber, and is curved to the side face on the filter chamber (9) side. An air purifier for an automobile, wherein a slope portion (6) having a bulging ventilation guide surface (17) is formed. 2. A filter chamber (9) in a nose part (10).
On the side surface on the side, the ventilation guide surface (1) of the slope portion (16)
2. The vehicle according to claim 1, wherein a shelf (18) is formed so as to extend into the filter chamber (9) in continuation with the filter chamber (7), and a shelf (18) for fixing one side of the filter (15) is formed. air purifier. 3. A fan (11) arranged in a scroll chamber (6) is provided with a plurality of blades (1) arranged in a circumferential direction.
2) a shroud (13) provided on the upper end side of the blade (12) and inclined so as to be substantially along the blowout angle of the air flowing out between the blades (12); and a lower end side of the blade (12). , And the inner surface (19) of the upper wall of the scroll chamber (6) is formed such that the side of the scroll inlet (7) is steeply inclined at substantially the same angle as the shroud (13). 3. The air purifier according to claim 1, wherein the air purifier is formed so as to gradually change its inclination gradually toward the scroll outlet (8).