JP5029593B2 - Blower device - Google Patents

Description

  The present invention relates to a blower device including a resonator, and is particularly useful when applied to an air conditioning blower device that sucks air into a duct of a vehicle air conditioner.

  Conventionally, Patent Document 1 describes that a resonator is attached to a wall surface of a ventilation path on the downstream side of a blower in order to absorb sound generated by a blower device. It also describes the basic principle of Helmholtz resonators.

  Specifically, as shown in FIG. 4, the blower 40 and a filter (not shown) for purifying the air supplied from the blower 40 are provided, and the filter is disposed at a clean air outlet serving as a final outlet. . Moreover, it has the housing | casing 42 which has the step part 41 which has the storage space of the air blower 40 in the upper corner part of FIG. 4, and has the clean air discharge port where the said filter is mounted | worn on the lower surface.

  And it has the pressure chamber 43 partitioned off from the storage space of the air blower 40 in the housing 42. FIG. Moreover, it has the 1st air flow path 45 which changes the direction of the airflow which was formed in the pressure chamber 43 and was blown off from the blower outlet 44 of the air blower 40 substantially 180 degree | times.

  In addition, a second air flow path (not shown) is formed in the housing 42 so as to communicate with the first air flow path 45 so that the air flow direction is substantially directed to the lowermost filter.

  In addition, air chambers 50 and 51 formed in a portion adjacent to the air outlet 44 of the blower 40 and a large number of openings 52 formed in a portion of the air chambers 50 and 51 facing the first air flow path 45. And 53, and sound absorbing layers 55 and 56 provided so as to block a large number of openings 52 and 53 of the air chambers 50 and 51.

  The air chambers 50 and 51 are formed asymmetrically with respect to the air outlet 44, and the surfaces of the air chambers 50 and 51 having the openings 52 and 53 are arranged to face the inner wall surface of the housing 42 at a predetermined angle.

  The first air flow path 45 formed in the pressure chamber 43 guides the air blown from the blower outlet 44 of the blower 40 downstream. The opening 60 formed below the first air flow path 45 and facing the air flow path 45 opens an unillustrated air chamber (opening 60 lower air chamber) to which the opening 60 communicates. 60 on the underside.

  Sound waves generated from the blower 40 enter and exit the air chambers 50 and 51 and the air chamber below the opening 60. The openings 52, 53, and 60 that are blocked by the sound absorbing layer of the air chamber serve as surfaces through which sound waves enter and exit, and the wall surface of the air chamber that is provided facing the openings 52, 53, and 60 of the air chamber does not generate sound waves. It becomes a reflective surface to reflect.

  As a result, a sound absorbing effect is produced for a sound wave having a wavelength with the reflection surfaces of the three air chambers as nodes and the openings 52, 53, and 60 as antinodes. A sound absorbing layer stretched around the openings 52, 53, and 60 converts sound energy into kinetic energy and absorbs sound.

The three air chambers are formed asymmetrically with respect to the air outlet 44, and the surface of the air chamber having the openings 52, 53, and 60 is disposed so as to face the inner wall surface of the housing 42 at a predetermined angle. Therefore, the range of wavelengths that can be attenuated is widened, and has an attenuation effect over a wide frequency range of low frequencies. Furthermore, since the silencer having a large attenuation is arranged immediately after the blower outlet 44 of the blower 40, it is said that noise at the generation source can be suppressed.
Japanese Patent Publication No. 7-33922

  This prior art shows a structure for consuming noise energy in the low frequency range near 100 Hz with respect to the noise of the blown wind from the blower device. It is necessary to make a structure that insulates the sound emitted directly from the fan of the blower by turning the road. However, there is a problem that the ventilation resistance increases as the number of bent portions increases, and the air flow rate decreases.

  The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to provide a silencer that also functions as a sound insulation wall with low ventilation resistance and high sound absorption efficiency of high-frequency sound. An object of the present invention is to obtain a blower device equipped with a mounted suction port.

  In order to achieve the above object, the present invention employs the following technical means. That is, in invention of Claim 1, it has the suction inlet (3) which sucks in a wind with a blower (2), and between the suction inlet (3) and the blower (2) was connected with the duct (4). In the thing, the bag-shaped resonator (5) provided with the opening part (6) opened toward the air blower (2) adjacent to the suction inlet (3) inside the duct (4). It is a feature.

  According to the first aspect of the present invention, since the bag-shaped resonator (5) having the opening (6) that opens toward the blower (2) is provided, the suction port (3) is connected to the outside. The noise of the blower (2) leaking out can be reduced. Since the resonator (5) has a bag shape with an opening (6) opening toward the blower (2), it also functions as a sound insulation wall for high-frequency noise between the blower (2) and the suction port (5). To do.

  Next, according to the invention of claim 2, the resonator (5) comprises a Helmholtz resonator, and the opening (6) opening toward the blower (2) is an axis along the wind flow of the duct (4). The resonator (5) has an outer shape that expands in a radial direction perpendicular to the axial direction as it is away from the opening (6) and away from the blower (2). It is characterized by that.

  According to the invention described in claim 2, since the resonator (5) has an outer shape that expands in the radial direction perpendicular to the axial direction as the distance from the blower (2) increases, the suction port (3) is provided. A large shape can be formed in the radial direction, air can be sucked from a wide range, and a horizontally long suction port (3) can be formed.

  Next, according to the invention of claim 3, the blower (2) sucks air from around the resonator (5), and the resonator (5) has a narrow opening (6) that opens toward the blower (2). It is characterized by having a funnel-shaped outer shape that is closed.

  According to the third aspect of the present invention, since the outer shape of the resonator (5) is a funnel shape except for the narrow opening (6) at the tip, the wind sucked by the blower (2) is reduced. It can flow along the funnel-shaped outer shape with low ventilation resistance. Moreover, since the wind does not directly face the opening (6), the whistling phenomenon when the wind flows can be prevented.

  Next, in the invention of claim 4, the blower (2) comprises an air-conditioning blower that sucks air into the duct (4) of the vehicle air conditioner, and the suction port (3) is connected to the vehicle from the suction port (3). It is characterized by comprising an air-conditioning suction port that opens to the rear of the rear seat of the vehicle that takes in indoor air and supplies air to the air-conditioning heat exchanger (8).

  According to the fourth aspect of the present invention, since a great effect is exhibited in reducing noise generated from the air conditioning inlet (3) close to the ear of the rear seat occupant, a comfortable vehicle interior environment can be obtained.

  Next, the invention of claim 5 is characterized in that the installation position of the resonator (5) is a position adjacent to the air inlet guide (9) of the air inlet (3).

  According to the fifth aspect of the present invention, the resonator (5) is installed at the position adjacent to the inlet airflow direction guide (9) close to the occupant's ear, thereby generating the blower (2). Besides the sound, it is possible to obtain a noise reduction effect for the airflow sound generated in the duct (4).

  Next, the invention of claim 6 is characterized in that the ventilation path side of the resonator (5) or the duct (4) is constituted by a sound absorbing layer (15, 16).

  According to the sixth aspect of the invention, since the ventilation path side of the resonator (5) or the duct (4) is constituted by the sound absorbing layer (15, 16), noise can be further attenuated.

  Next, the invention of claim 7 is characterized in that a filter (7) is installed between the blower (2) and the resonator (5).

  According to the seventh aspect of the present invention, the filter (7) can first mute the sound, and the filter (7) can further attenuate the noise by the resonator (5) having a different muffling characteristic and principle. . In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a schematic cross-sectional view of a vehicle air conditioner 1 that air-conditions a rear seat of an automobile. The rear tray of the vehicle near the occupant's rear head has a suction port 3 for sucking wind by the blower 2. The suction port 3 and the blower 2 are connected by a duct 4 that forms an air conditioning unit.

  Inside the duct 4, a bag-like resonator 5 is provided adjacent to the suction port 3. The resonator 5 constitutes a Helmholtz resonator. The resonator 5 has a bag shape having an opening 6 that opens toward the blower 2.

  The blower 2 includes a sirocco fan 2a and a blower motor 2b, and constitutes an air conditioning blower that sucks air into the duct 4 of the vehicle air conditioner 1. Then, the blower 2 directs the vehicle interior air taken in from the air intake port 3 constituting the air conditioning intake port to the vehicle interior rear seat via the filter 7 and an evaporator (evaporator) 8 serving as an air conditioning heat exchanger. To cool the rear seat space.

  The resonator 5 has an opening 6 that opens toward the blower 2, and the opening 6 faces the blower 2 along the axial direction along the wind flow of the duct 4 (the vertical direction in FIG. 1).

  The opening 6 is located at the center of the duct 4 and is opposed to the rotation shaft at the center of the sirocco fan 2a. Further, the resonator 5 includes a housing 5a having an outer diameter that expands in a radial direction perpendicular to the axial direction as the distance from the opening 6 increases away from the blower 2, that is, the upstream side of the wind flow.

  Thereby, the blower 2 sucks air from around the resonator 5. In addition, the resonator 5 has a funnel-shaped outer shape in which portions other than the opening 6 are closed.

  The installation position of the resonator 5 is a position adjacent to the air inlet guide 9 of the air inlet 3 close to the passenger's ear. The air inlet direction guide 9 is composed of a number of louvers, and when looking into the inside from the air inlet direction guide 9, the bottom 5b of the resonator 5 having a funnel-shaped outer shape obstructs the blower 2 from being easily seen. Has been.

  The bell mouth portion 2 c of the blower 2 is sealed between the duct 4 so that air does not leak outside the duct 4. And the noise of the air blower 2 etc. which leaks outside from the suction inlet 3 can be reduced by having provided the bag-shaped resonator 5 provided with the opening part 6 opened toward the air blower 2. FIG.

  In addition, when looking into the inside from the air inlet guide 9, the resonator 5, which has a funnel-shaped outer shape, obstructs the blower, so that it is difficult to see the blower. In other words, the resonator 5 is connected to the blower 2. Since it is funnel shape provided with the opening part 6 opened toward, it functions also as a sound insulation wall between the air blower 2 and the suction inlet 3. FIG. Therefore, it is possible to attenuate and cut off the noise in the high frequency range which is excellent in straightness.

  Since the resonator 5 has a housing 5a having an outer diameter that expands in the radial direction orthogonal to the axial direction as the distance from the blower 2 increases, the suction port 3 can be formed into a horizontally long shape in the radial direction. Wind can be sucked from a wide range of directions.

  As a result, a sufficient intake air volume can be obtained even in a narrow installation space. Further, since the wind flows along the both sides of the resonator 5 having a funnel-shaped outer shape with a slight change in the wind flow, the ventilation resistance can be reduced.

  Further, since the ventilation path can be formed so that the wind does not flow directly into the opening, the whistling phenomenon at the opening 6 when the wind flows can be prevented.

  Moreover, since the noise generated from the air-conditioning inlet 3 close to the ears of the rear seat occupant can be reduced, a comfortable vehicle interior environment can be obtained. Furthermore, the installation position of the resonator 5 is a vehicle air conditioner equipped with an air conditioner blower device by setting it to a position adjacent to the inlet airflow direction guide 9 close to the passenger's ear (final exit of the sound propagation path). In addition to the generated blower noise, it is possible to obtain a noise reduction effect for the airflow sound generated in the duct.

  Moreover, since the suction inlet wind direction guide 9 comprised from the louver hides the resonator 5 which exhibits a funnel-shaped external shape, appearance does not deteriorate. Note that a gap 10 through which wind flows is provided between the air inlet guide 3 and the downstream end of the resonator 5 (bottom of the funnel).

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 2 is a schematic cross-sectional view of another vehicle air conditioner 1 that performs air conditioning of the rear seats, as in FIG. 1. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described.

  In the second embodiment, the outer periphery of the resonator 5 is constituted by a sound absorbing layer 15. In addition, the inner wall portion of the duct 4 that forms the air passage from the air-conditioning suction port 3 to the blower 2 is also formed by the sound absorbing layer 16. These sound absorbing layers 15 and 16 are made by adhering a sound absorbing material such as a foamed resin or a porous material to the inner wall of the duct 4 or the outer periphery of the casing 5 a of the resonator 5.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 3 is a schematic cross-sectional view of another vehicle air conditioner 1 that air-conditions the rear seat, as in FIG. 2. Features different from the above-described embodiment will be described. In the third embodiment, the filter 7 is installed between the resonator 5 and the blower 2 in response to a case where a sound absorption effect is further required.

  According to this, since the noise from the blower 2 is attenuated by the filter 7 and further the sound attenuating action of the principle different is performed by the resonator 5, a further sound absorbing effect can be obtained in a wide frequency band.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the embodiment, the funnel type resonator 5 is used, but this may be any one of a cylindrical shape, a box shape, and a triangular pyramid shape.

  Moreover, although the opening part 6 was made only one toward the air blower 2, this opening part 6 may be provided with two or more.

  Further, a well-known inflatable silencer in which a part of the duct 4 between the blower 2 and the air inlet guide 9 is enlarged may be additionally formed.

  In the second embodiment of FIG. 2, the sound absorbing layer 16 and the duct 4, or the sound absorbing layer 15 and the housing 5 a of the resonator 5 may be integrated. In this case, the sound absorbing layer 16 and the duct 4 or the sound absorbing layer 15 and the resonator casing 5a are formed by two-layer molding of soft resin and hard resin. Alternatively, the casing 5a of the duct 4 or the resonator 5 may be configured using a multilayer plate with rubber or the like having a high sound absorbing effect interposed therebetween.

  Further, only the outer periphery of the resonator 5 may be constituted by the sound absorbing layer 15 and the sound absorbing layer 16 on the duct 4 side may be omitted. In addition, although the bottom 5b of the funnel-shaped resonator 5 of FIG. 1 has a flat shape, it may have a chevron shape bent into a square shape in order to reduce ventilation resistance. Furthermore, although the resonator 5 is installed at the center of the duct 4 in the axial direction, it may be provided in any direction.

1 is a schematic cross-sectional view of a vehicle air conditioner that performs air conditioning of a rear seat in the first embodiment of the present invention. It is a model sectional drawing of the vehicle air conditioner which air-conditions a rear seat in 2nd Embodiment. It is a model sectional drawing of the vehicle air conditioner which air-conditions a rear seat in 3rd Embodiment. It is a partial fracture perspective view of the conventional blower device of the type which blows out a wind.

Explanation of symbols

2… Blower (blower for air conditioning)
3 ... Suction port (air conditioning suction port)
4 ... Duct 6 ... Opening 5 ... Resonator (Helmholtz resonator)
2 ... Blower 9 ... Air inlet direction guide 15,16 ... Sound absorption layer 7 ... Filter

Claims (7)

In the one having a suction port (3) for sucking wind by the blower (2), and connecting the suction port (3) and the blower (2) with a duct (4),
A bag-like resonator (5) provided with an opening (6) that opens toward the blower (2) adjacent to the suction port (3) is provided inside the duct (4). Blower device characterized. The resonator (5) comprises a Helmholtz resonator,
The opening (6) opening toward the blower (2) faces the blower (2) along the axial direction along the wind flow of the duct (4),
The said resonator (5) has the external shape which expands in the radial direction orthogonal to the said axial direction, so that it leaves | separates from the said opening (6) and it leaves | separates from the said fan (2), The resonator (5) has The blower device described. The blower (2) sucks air from around the resonator (5),
The blower device according to claim 2, wherein the resonator (5) has a funnel-shaped outer shape except for a narrow opening (6) at a tip opening toward the blower (2). .   The blower (2) includes an air conditioning blower that sucks air into a duct (4) of a vehicle air conditioner, and the suction port (3) takes air in the vehicle compartment from the suction port (3) for air conditioning. The blower device according to any one of claims 1 to 3, further comprising an air-conditioning inlet opening at the rear of the vehicle rear seat for supplying air to the heat exchanger (8).   The blower device according to claim 4, wherein the installation position of the resonator (5) is a position adjacent to the air inlet direction guide (9) of the air conditioning inlet (3).   The blower device according to any one of claims 1 to 5, wherein the resonator (5) or the duct (4) has a ventilation path side formed of a sound absorbing layer (15, 16).   The blower device according to any one of claims 1 to 6, wherein a filter (7) is installed between the blower (2) and the resonator (5).

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