JP2014231263A - Air conditioning duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air conditioning duct capable of further improving sound absorption performance.SOLUTION: A duct main body 24 is formed out of a fiber material 22 formed by a plurality of regions (a low density portion 22B, a high density portion 22A, etc.) different in sound absorption effect. It is thereby possible to gradually absorb sound produced when conditioned air flowing in the duct main body 24 strikes on a wall 28 of the duct main body 24. By locally changing thickness of layers of the high density portion 22A, the low density portion 22B and the like in the fiber material 22 depending on a flow of the conditioned air in the duct main body 24, the sound absorption effect can be locally changed in the duct main body 24 and sound absorption performance can be further improved.

Description

  The present invention relates to an air conditioning duct provided in a vehicle interior.

  Patent Document 1 discloses a vehicle interior member that is disposed inside various vehicle interior members such as an instrument panel and a floor console in the interior of the vehicle, and the temperature control air (air conditioned air) from an air conditioner unit (air conditioner). The technology regarding the air guide duct (air-conditioning duct) which guides to the air blower outlet (register) provided in is disclosed.

  Specifically, the air guide duct is composed of an outer layer sheet and an inner layer sheet, and the outer layer sheet has a rigidity capable of imparting a necessary shape to the duct and maintaining the shape. It has a heat insulating function and is stuck across the entire inner surface of the outer layer sheet. With this configuration, the air guide duct can obtain a sound absorption effect and a heat insulation effect.

JP 2001-180250 A

  However, in this prior art, the outer layer sheet and the inner layer sheet are each formed uniformly. For this reason, in the air guide duct, the outer layer sheet and the inner layer sheet have the same thickness in each cross section cut along the direction orthogonal to the flow direction of the temperature-controlled air. In other words, depending on how the temperature-controlled air flows, there may be a part where the temperature-controlled air is strongly applied in the air guide duct. In this case, there is a possibility that sound absorption may not be sufficient. There is room for.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the air-conditioning duct which can further improve a sound absorption performance.

  The air conditioning duct according to the invention of claim 1 sets the duct main body for guiding the conditioned air sent from the air conditioner into the passenger compartment, and at least a part of the duct main body, and the conditioned air in the duct main body. A cross-section cut along a direction orthogonal to the flow direction, and a sound absorbing portion having at least two types of regions having different sound absorbing effects.

  In the air conditioning duct according to the first aspect of the invention, the conditioned air sent from the air conditioner is guided into the vehicle interior via the duct body. At least a part of the duct main body is set by a sound absorbing portion, and the sound absorbing portion has at least two different sound absorbing effects in a cross section cut along a direction orthogonal to the flow direction of the conditioned air in the duct main body. Has more than types of areas.

  As described above, when at least a part of the duct body is set in the sound absorbing portion having a plurality of regions (layers) having different sound absorption effects, the conditioned air flowing in the duct body hits the inner wall of the duct body. Sound can be absorbed in stages. And, by locally changing the thickness of each layer in the sound absorbing portion in accordance with the flow of conditioned air in the duct body, the sound absorbing effect in the duct body can be changed locally, and the sound absorbing performance can be further improved. .

  An air conditioning duct according to a second aspect of the present invention is the air conditioning duct according to the first aspect, wherein the sound absorbing portion is made of a fiber material and is formed of a plurality of layers having different densities.

  In the air conditioning duct according to the second aspect of the invention, the sound absorbing portion forms a plurality of layers having different sound absorbing effects by changing the density of the fiber material. Generally, in the same type of fiber material, the sound absorption effect is higher when the fiber is formed at a high density than when it is formed at a low density. Therefore, in the present invention, the sound absorption performance is changed by changing the density of the fiber material. ing.

  An air conditioning duct according to a third aspect of the present invention is the air conditioning duct according to the second aspect, wherein the outer portion of the duct body is a high-density layer, and the curved portion that changes the flow direction of the conditioned air in the duct body is provided. A low density layer is provided on the inner wall surface side of the wall portion that is formed and hits the conditioned air in the curved portion.

  In the air conditioning duct according to the third aspect of the present invention, the outer portion of the duct body is a high-density layer, and a curved portion that changes the flow direction of the conditioned air is formed in the duct body. In this curved portion, a low density layer is provided on the inner wall surface side of the wall portion to which the conditioned air hits.

  The strongest sound that is struck by the conditioned air is generated on the wall portion of the curved portion of the duct body. In addition, the blower sound of the air conditioner first hits in the duct body. In the present invention, since the wall itself is the outer shape of the duct body, it is a high-density layer in the fiber material having a sound absorbing effect, and further, a low-density layer in the fiber material is provided on the inner wall surface side of the wall portion. Thus, it is possible to effectively absorb the sound hit by the conditioned air. That is, it is possible to effectively obtain the sound absorbing performance in the duct body by locally providing the low density layer and the high density layer only to the portion where the sound is generated by the conditioned air.

  An air-conditioning duct according to a fourth aspect of the present invention is the air-conditioning duct according to the second or third aspect, wherein an outer portion of the duct main body is a high-density layer, and the air-conditioning air is straightened in the duct main body. A linear part to be flowed is formed, and a low density layer is provided outside the linear part.

  In the air-conditioning duct according to the invention of claim 4, the low-density layer is provided outside the linear shape portion that linearly flows the conditioned air in the duct main body, so that the other parts disposed around the duct main body The generation of abnormal noise due to the interference can be suppressed. Thereby, the clearance gap between a duct main body and another component can be narrowed.

  As described above, the air conditioning duct according to the first aspect of the present invention has an excellent effect that the sound absorption performance can be further improved.

  The air conditioning duct according to the invention of claim 2 can reduce the cost as compared with the case of separately attaching a sound absorbing member to the duct body in order to improve the sound absorbing performance by changing the density of the fiber material. It has an excellent effect.

  The air-conditioning duct according to the invention of claim 3 has an excellent effect that the sound absorption effect can be enhanced in accordance with a site where sound is generated when the air-conditioned wind hits.

  The air conditioning duct according to the invention described in claim 4 has an excellent effect that a space can be secured by narrowing a gap between the duct main body and other components.

It is sectional drawing which shows the state cut | disconnected along the 1-1 line | wire of FIG. The air conditioning duct which concerns on this Embodiment is shown, (A) is a schematic plan view, (B) is a schematic front view. It is sectional drawing which shows the density of the fiber material which comprises the air conditioning duct which concerns on this Embodiment. It is sectional drawing which shows the state cut | disconnected along line 4-4 of FIG. 2 (A). It is sectional drawing which shows the state cut | disconnected along line 5-5 of FIG. 2 (B). A plan view is shown including the passenger compartment with the vehicle roof panel removed. (A), (B) is a perspective view which shows the modification of the air conditioning duct which concerns on this Embodiment, respectively.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that an arrow FR appropriately shown in the drawing indicates a forward direction in the vehicle longitudinal direction, an arrow UP indicates an upward direction in the vehicle vertical direction, an arrow OUT indicates an outer side in the vehicle width direction, and an arrow W indicates a vehicle width direction.

  FIG. 6 is a plan view including the passenger compartment 14 with the roof panel removed on the front side of the vehicle 10 in the vehicle front-rear direction. In the resin instrument panel 12 provided on the vehicle front side in the passenger compartment 14, registers 17 and 16 are provided on the vehicle front side of the driver seat 13 and the passenger seat 15, respectively.

  An air conditioning duct 20 connected to an air conditioner 18 is connected to these registers 16 and 17, and air conditioned air from the air conditioner 18 is blown out from the registers 16 and 17 toward the interior of the vehicle compartment 14. It is like that.

(Configuration of air conditioning duct)
Here, an example of the configuration of the air conditioning duct 20 according to the present embodiment will be described.

  As described above, as shown in FIG. 6, the air conditioning duct 20 is connected to the air conditioner 18 and is connected to the registers 16 and 17, respectively. Each extends from the portion toward the outside in the vehicle width direction. Note that the description of the register 16 is omitted because it has substantially the same configuration as the register 17.

  As shown in FIG. 2B, the air conditioner 18 is disposed below the register 17 in the vehicle vertical direction. For this reason, on the air conditioner 18 side in the duct main body 24 as the air conditioning duct 20, an upright portion 24A1 that rises upward in the vehicle vertical direction is provided. Further, the duct body 24 is provided with a linear portion 24A2 that extends linearly along the vehicle width direction, and is continuous between the linear portion 24A2 and the upright portion 24A1. A curved portion 24A3 is provided.

  Further, as shown in FIG. 6, the air conditioner 18 is disposed on the front side in the vehicle front-rear direction with respect to the register 17. For this reason, as shown in FIG. 2 (A), on the register 17 side of the duct body 24, a linearly-shaped portion 24A4 extending linearly along the vehicle longitudinal direction is provided, and the linear-shaped portion Between 24A4 and linear shape part 24A2, curved part 24A5 which makes these continue is provided.

  Here, as shown in FIGS. 2A and 2B, the duct main body 24 is orthogonal to the flow direction of the conditioned air in the duct main body 24 (arrow directions indicated by a one-dot chain line and a two-dot chain line). In a cross section cut along a direction (for example, a direction along line 1-1, line 4-4, line 5-5), it is configured by at least two types of regions (layers) having different sound absorption effects. .

  As a means for changing the sound absorption effect, in the present embodiment, for example, the density of the fiber material 22 as the sound absorbing portion is changed. Generally, the rigidity of the fiber material 22 can be changed by changing the density. For this reason, the outer portion 24 </ b> A of the duct body 24 is a high-density portion 22 </ b> A (see FIG. 1) as one region in the fiber material 22.

  Further, as shown in FIGS. 1 and 2A, the curved portion 24A3 in the duct main body 24 forms a part of the outer shape portion 24A of the duct main body 24 and hits the conditioned air (arrow indicated by a two-dot chain line). ) On the inner wall surface side of the wall portion 28 (the upper portion of the curved portion 24A3), a low density portion 22B is provided as another region where the density of the fiber material 22 is lower than that of the outer shape portion 24A.

  The low-density part 22B is formed so that a smooth curved surface is formed between the flow path 26 of the duct body 24, and in the longitudinal direction of the duct body 24 and the width direction orthogonal to the longitudinal direction. Along the layers, the thicknesses are different. That is, in the low density portion 22B, the thickness of the layer gradually decreases toward the outside.

  In the low density portion 22B, as shown in FIG. 3, the density gradually changes from a coarse state to a dense state. That is, in the low density part 22B shown in FIG. 1, the density gradually increases from the flow path 26 side in the duct body 24 toward the outside of the duct body 24. In FIGS. 1 and 3 to 5, in expressing the density density of the fiber material 22, the fibers are shown in a granular form for easy understanding, and the size is changed.

  On the other hand, in the linear shape portion 24A2 in the duct main body 24 shown in FIG. 1, a low density portion 22C is provided outside the outer shape portion 24A. As shown in FIG. 5, the low density portion 22 </ b> C is formed so that the thickness of the layer is substantially constant on the center side in the width direction at the upper and lower portions of the duct body 24, and on the outer side in the width direction. It forms so that it may become thin gradually as it goes to the outer edge part of the duct main body 24. FIG. Here, the outer portion 24A of the duct body 24 is divided into an upper part and a lower part, but the upper part and the lower part may be formed integrally.

  Further, as shown in FIG. 1, on the lower side of the curved portion 24A3 in the duct body 24, a low density portion 22D is provided outside the outer shape portion 24A, and the low density portion 22D corresponds to the linear shape portion 24A2. It is formed continuously with the low density portion 22C formed outside the outer portion 24A.

  Further, as shown in FIGS. 2A and 4, in the curved portion 24A5, the air-conditioned air strikes (arrow indicated by a two-dot chain line) the wall portion 30 (the front portion in the vehicle front-rear direction of the curved portion 24A5 and the vehicle width direction). On the inner wall surface side on the outer side, a low density portion 22E in which the density of the fiber material 22 is lower than that of the outer shape portion 24A is provided.

  Further, in the curved portion 24A5, a low density portion 22F is provided outside the outer shape portion 24A. The low density portion 22F is formed continuously with the low density portion 22C formed outside the outer shape portion 24A in the linear shape portion 24A2 shown in FIG.

(Duct action / effect)
Next, the operation and effect of the duct according to the present embodiment will be described.

  As shown in FIG. 1, the duct body 24 is formed of the fiber material 22 having a plurality of regions (high density portion 22A, low density portion 22B, etc.) having different sound absorption effects, so that the air conditioning flowing in the duct body 24 is performed. The sound when the wind hits the wall portion 28 and the wall portion 30 (see FIG. 4) of the duct main body 24 can be absorbed step by step.

  And the sound absorption in the duct main body 24 is locally changed according to the flow of the conditioned air in the duct main body 24 by locally changing the thickness of the high density portion 22A and the low density portion 22B as a plurality of regions in the fiber material 22. The effect can be changed locally, and the sound absorption performance can be further improved.

  In this embodiment, the sound absorbing portion is made of the fiber material 22 and is formed of a plurality of regions (layers) having different densities such as the high density portion 22A and the low density portion 22B. In general, in the same type of fiber material 22, the sound absorption effect is higher when the fiber material 22 is formed at a high density than when it is formed at a low density. For this reason, in this embodiment, the sound absorption performance is changed by changing the density of the fiber material 22. As described above, since the sound absorbing performance is improved by changing the density of the fiber material 22, the cost of the duct main body 24 can be reduced as compared with the case where a separate sound absorbing member is attached to the duct main body 24.

  Further, in the present embodiment, as shown in FIGS. 2A and 2B, curved portions 24A3 and 24A5 that change the flow direction of the conditioned air are formed in the duct body 24. In general, sounds that are struck by conditioned air are generated on the walls 28 and 30 of the curved portions 24A3 and 24A5, respectively. And the blower generation sound of the air conditioner 18 collides in the duct main body 24.

  However, in the present embodiment, as shown in FIG. 1, the low density portion 22 </ b> B is provided on the inner wall surface side of the wall portion 28. Since the outer portion 24A of the duct body 24 is formed as the high-density portion 22A in the fiber material 22, the low-density portion 22B is provided on the inner side of the high-density portion 22A in the wall portion 28, so that the air-conditioned wind is walled. The sound hitting the portion 28 can be effectively absorbed.

  Similar to the wall portion 28, as shown in FIG. 4, a low density portion 22 </ b> E is provided on the inner wall surface side of the wall portion 30. For this reason, in the wall part 30, by providing the low density part 22E inside the high density part 22A, it is possible to effectively absorb the sound of the conditioned air hitting the wall part 30.

  That is, by providing the low density portions 22B and 22E locally at the site where the sound is generated by the conditioned air, the duct main body 24 is effectively combined with the high density portion 22A constituting the outer shape portion 24A of the duct main body 24. Sound absorption performance can be obtained.

  Moreover, in this embodiment, as shown in FIG.1 and FIG.2 (A), in the duct main body 24, linear shape part 24A2, 24A4 which makes an air-conditioning air flow linearly is formed, and it is straight from this linear shape part 24A2. A low density portion 22C is provided outside the shape portion 24A4. Further, on the lower side of the bending portion 24A3, a low density portion 22D is provided outside the outer shape portion 24A, and in the bending portion 24A5, a low density portion 22F is provided outside the outer shape portion 24A.

  Therefore, as shown in FIG. 5, it is possible to suppress the generation of abnormal noise due to interference with other components (for example, the instrument panel 12 and the radio 32) disposed around the duct body 24. Thereby, the clearance gap between the duct main body 24 and other components can be narrowed. Thus, a space can be ensured by narrowing the gap between the duct body 24 and other components. Therefore, the cross-sectional area of the duct main body 24 can be increased by the amount of space secured between the duct main body 24 and other components, and pressure loss can be suppressed.

  Further, condensation may occur on the surface of the duct body 24 due to a temperature difference between the conditioned air flowing in the duct body 24 and the outside of the duct body 24, but the low density portions 22 </ b> C and 22 </ b> D are formed outside the duct body 24. , 22F is provided, and dripping due to the condensation can be suppressed. Further, by providing the low density portions 22 </ b> C, 22 </ b> D, and 22 </ b> F outside the duct body 24, it is possible to absorb noise in the instrument panel 12 around the duct body 24.

(Supplement of embodiment)
In the present embodiment, the example in which the duct main body 24 is formed of the fiber material 22 has been described. However, in the present invention, it is only necessary that the sound absorbing portion is set at least in part, and the present invention is not limited to this. For example, the fiber material 22 having at least two types of regions having different sound absorption effects may be provided in a part of the duct main body 24 formed of a member other than the fiber material 22 (for example, resin).

  Moreover, as FIG. 3 shows, although the density is changing gradually in the thickness direction in the low density part 22B, the low density part 22B may be formed with the same density over the whole. That is, in the high density portion 22A and the low density portion 22B in the present embodiment, a clear boundary may be provided in the density change in the adjacent layers, or a clear boundary may not be provided. Further, the high density portion 22A and the low density portion 22B are relatively set between adjacent layers. The same applies to the other low density portions 22C, 22D, 22E, and 22F.

  Further, in this embodiment, the fiber material 22 is taken as an example of the sound absorbing portion, and a plurality of regions (layers) having different sound absorption effects are formed by changing the density of one fiber material 22. The sound absorption effect may be changed by using a material.

  Further, a foamed member such as a urethane material may be used as the sound absorbing portion instead of the fiber material. When a foamed member is used, the sound absorption effect may be changed by changing the foaming rate of the urethane material and changing the size of the particle diameter. Thus, when changing the size of the particle diameter, a region (layer) with a small particle diameter is formed at a site where the sound absorption effect is desired to be enhanced.

  Further, in the present embodiment, as shown in FIG. 6, an air conditioning duct 20 that connects the air conditioner 18 and the registers 16 and 17 provided on the vehicle front side of the driver seat 13 and the passenger seat 15 in the instrument panel 12. However, the present invention is not limited to this, as long as it is a duct for air conditioning.

  For example, although not shown, the present invention may be applied to an air conditioning duct that connects a defroster disposed on the instrument panel 12 and the air conditioner 18.

  Further, as shown in FIGS. 6 and 7A, when the register 36 is disposed on the center console 34 extending along the vehicle longitudinal direction between the driver's seat 13 and the passenger seat 15, The present invention may be applied to an air conditioning duct 38 that connects the register 36 and the air conditioner 18.

  Furthermore, as shown in FIG. 6 and FIG. 7B, when the defroster 42 is disposed on the side door 40, the defroster 42 may be applied to an air conditioning duct 44 that connects the air conditioning device 18. .

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 Vehicle 18 Air conditioning apparatus 20 Air conditioning duct 22 Textile material (sound absorption part)
22A high density part (high density layer)
22B Low density part (low density layer)
22C Low density part (low density layer)
22D Low density part (low density layer)
22E Low density part (low density layer)
22F Low density part (low density layer)
24 Duct body 24A Outline (high density layer)
24A2 Linear shape portion 24A4 Linear shape portion 24A3 Curved portion 24A5 Curved portion 28 Wall portion 30 Wall portion 38 Air conditioning duct 44 Air conditioning duct

Claims (4)

A duct body for guiding the conditioned air sent from the air conditioner into the passenger compartment,
The sound absorption having at least a part of the duct main body and having at least two types of regions having different sound absorption effects in a cross section cut along a direction orthogonal to the flow direction of the conditioned air in the duct main body And
Having air conditioning duct.   The air-conditioning duct according to claim 1, wherein the sound absorbing portion is made of a fiber material and is formed of a plurality of layers having different densities.   The outer portion of the duct body is a high-density layer, a curved portion that changes the flow direction of the conditioned air is formed in the duct body, and the low-density layer is formed on the inner wall surface side of the wall portion that the conditioned air hits in the curved portion. The air-conditioning duct according to claim 2 provided with.   The outer shape of the duct main body is a high density layer, a linear shape portion that linearly flows the conditioned air in the duct main body is formed, and a low density layer is provided outside the linear shape portion. The air conditioning duct according to claim 2 or claim 3.

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