JP2008273333A - Floor silencer with duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor sensor equipped with a duct superior in heat insulating and soundproofing performance and embodied in a lightweight construction. <P>SOLUTION: The floor silencer 10 equipped with heater duct to be installed in a vehicle consists in a molding of a soundproofing material 2 (for example, RSPP consisting of vehicle waste material such as foaming polyurethane), wherein the molding contains a cylindrical duct part 1 equipped with a fluid blowing hole 11 and a fluid blowout hole 12, in such an arrangement that fluid for air-conditioning can flow through the duct part 1, whose inner surfaces are covered with a non-aeration layer 3 (for example, polyethylene-polyamide-polyethylene laminated film etc.). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a floor silencer with a duct. More specifically, the present invention relates to a ducted floor silencer that is excellent in heat insulation and soundproofing and is lightweight.

Conventionally, as shown in FIG. 19 and FIG. 20 (schematic diagram for explaining the FF cross section in FIG. 19), the floor carpet 5 (front seat side) arranged in the vehicle is under the floor, An air duct 6 is provided for blowing fluid from the air conditioning equipment to the foot of the rear seat. As such an air duct, those composed mainly of a resin such as polyethylene (PE) or polypropylene (PP) (for example, see Patent Document 1 and Patent Document 2) are used.
Further, as shown in FIG. 19, a floor silencer 7 is disposed below the floor carpet 5 together with the air duct 6 in order to ensure soundproofing and heat insulation.

However, at present, the resin such as PP and PE used for the air duct does not have sufficient heat insulation performance to be possessed as an air duct and does not have soundproof performance. Due to design restrictions, as shown in FIGS. 19 and 20, the floor silencer 7 (71, 72, 73) needs to be divided around the air duct 6, and the air duct 6 is arranged. In these parts, sufficient heat insulation and sound insulation are not obtained. Furthermore, it is necessary to provide a predetermined gap between the air duct 6 and the floor silencer 7 (71, 72, 73) by design, and this gap also causes a decrease in soundproofing and heat insulating properties. Yes.
Further, the resin air duct is heavy and further weight reduction is desired.

JP 2004-276852 A JP 2004-268807 A

  This invention is made | formed in view of the said situation, and it aims at providing the floor silencer with a duct which is excellent in heat insulation and sound insulation, and is lightweight.

The present invention is as follows.
[1] A floor silencer with a duct which is disposed in a vehicle and is formed of a molded body of a soundproof material. The molded body has a cylindrical duct portion, and the duct portion is for air conditioning. The floor silencer with a duct is characterized in that the inner fluid of the duct part is covered with a non-ventilated layer.
[2] The floor silencer with duct according to [1], wherein an upper wall of the duct portion on the vehicle compartment side is formed of a material having a higher density than a lower wall of the duct portion on the vehicle body side. .
[3] The floor silencer with duct according to [2], wherein a side wall of the duct portion is formed of a material having a higher density than a lower wall on the vehicle body side of the duct portion.
[4] The duct-equipped floor silencer according to any one of [1] to [3], wherein a rib is formed on an upper wall on the passenger compartment side of the duct portion.

In the floor silencer with duct of the present invention, the duct portion and the floor silencer portion, which are conventionally separately arranged, are integrated, so there is no gap between them, and the heat insulation and soundproofing properties are excellent. Moreover, since the duct part and the floor silencer part are integrated, it leads to reduction of the number of parts, reduction of assembly man-hours, weight reduction of parts, and the like, and productivity such as work time can be further improved. Furthermore, since the duct portion can be easily formed at a desired position, design restrictions are reduced, and a layout can be performed more freely than before.
In addition, when the upper wall on the passenger compartment side of the duct portion is formed of a material having a higher density than the lower wall on the vehicle body side of the duct portion, a floor silencer with a duct having sufficient strength and can do.
Furthermore, when the side wall of the duct part is formed of a material having a higher density than the lower wall on the vehicle body side of the duct part, a floor silencer with a duct having sufficient strength can be obtained.
In addition, when a rib is formed on the upper wall of the duct portion on the vehicle compartment side, a floor silencer with a duct having higher strength can be obtained.

Hereinafter, embodiments of the present invention will be described in detail.
The floor silencer with a duct according to the present invention is arranged in a vehicle and is formed of a molded body of a soundproof material. This floor silencer with a duct is normally disposed below the floor carpet (front seat side) disposed in a vehicle such as an automobile.

The “molded body” is formed with a cylindrical duct portion through which air-conditioning fluid can flow. Specifically, it is formed at one end (front side of the vehicle) of the molded body and connected to the air conditioning unit of the vehicle, and is formed at the other end (rear side of the vehicle) of the molded body and blown from the air conditioning unit. A cylindrical duct portion including a fluid outlet for discharging the fluid to be discharged to the foot of the rear seat is formed.
In addition, the shape of the said molded object can be suitably adjusted according to the shape etc. of the vehicle body of the vehicle type by which the floor silencer with a duct of this invention is arrange | positioned, a floor carpet, etc.

  Moreover, the material of the said soundproof material is not specifically limited, The well-known material used for the conventional floor silencer can be used. Examples thereof include resin foams such as urethane, felts, foam beads, and nonwoven chip molds. Furthermore, recycled materials from industrial waste materials such as vehicle waste materials [“Recycled Sound-Proofing Products (RSPP)”] and the like can be mentioned. These may be used individually by 1 type, and 2 or more types may be mixed and used.

Density of the soundproofing material is preferably 0.02~0.25g / cm ^3, more preferably 0.06~0.2g / cm ^3, more preferably 0.08~0.12g / cm ³ It is. When this density is 0.02 to 0.25 g / cm ³ , a floor silencer with a duct excellent in soundproofing and heat insulating properties can be obtained.

In the molded body, the upper wall of the duct portion on the vehicle compartment side is made of a material having a higher density than the lower wall of the duct portion on the vehicle body side (hereinafter referred to as “high density material”). Preferably it is formed. In this case, it can be set as the floor silencer with a duct provided with sufficient intensity | strength.
Furthermore, it is preferable that the side wall of the duct part is formed of a high-density material having a higher density than the lower wall of the duct part on the vehicle body side. In this case, it can be set as the floor silencer with a duct provided with sufficient intensity | strength.

Examples of the high-density material include recycled fibers such as miscellaneous wool (anti-wool cotton), and thermoplastic resin fibers such as polyethylene, polypropylene, and polyethylene terephthalate (PET). Only one kind of these high-density materials may be used, or two or more kinds may be mixed and used.
When both the upper wall and the side wall of the duct part are formed of a high density material, the high density material forming the upper wall and the side wall may be the same or different.

Density of the high density material is preferably 0.15~2.0g / cm ^3, more preferably 0.2 to 1.0 g / cm ^3, more preferably 0.3 to 0.8 g / cm ³ . When this density is 0.15 to 2.0 g / cm ³ , a floor silencer with a duct having sufficient strength can be obtained.

Further, the thickness of the upper wall when the upper wall is formed of the high-density material can be appropriately adjusted as necessary, and is not particularly limited, but is preferably 0.5 to 10 mm, Preferably it is 1-5 mm, More preferably, it is 1-3 mm. When this thickness is 0.5-10 mm, it can be set as the floor silencer with a duct provided with sufficient intensity | strength.
Furthermore, the thickness of the side wall when the side wall is formed of the high-density material can be appropriately adjusted as necessary, and is not particularly limited, but is preferably 0.5 to 10 mm, more preferably It is 1-5 mm, More preferably, it is 1-3 mm. When this thickness is 0.5-10 mm, it can be set as the floor silencer with a duct provided with sufficient intensity | strength.

Further, the inner surface of the duct part is covered with a non-breathing layer.
The material of the non-breathable layer is not particularly limited as long as the duct portion can be kept airtight, and examples thereof include a resin film, a metal film, a rubber film, and a resin foam. Among these, resin films such as polyethylene and polyamide are preferable. In particular, a resin film made of a resin on which at least one surface can be heat-sealed is preferable, and specific examples include laminated films such as polyethylene / polyamide laminated films and polyethylene / polyamide / polyethylene laminated films.

  Although the thickness of the said non-breathable layer is not specifically limited, It is preferable that it is 5-300 micrometers, More preferably, it is 30-100 micrometers, More preferably, it is 45-60 micrometers. When this thickness is 5 to 300 μm, the duct portion can be kept sufficiently airtight.

The cross-sectional shape of the duct part is not particularly limited as long as a predetermined amount of fluid can flow therethrough.
The volume of the duct portion is not particularly limited, and can be appropriately adjusted according to the shape of the vehicle body or floor carpet of the vehicle type on which the floor silencer with duct of the present invention is disposed.

  Ribs can be formed on the upper wall of the duct portion on the vehicle compartment side in order to further improve the strength. The shape of the rib is not particularly limited, and can be, for example, a V-shaped section or a U-shaped section. In addition, such a rib may be formed only in one place and may be formed in two or more places.

Moreover, the said duct part may be formed only in one place, and may be formed in two or more places.
Further, in the duct portion, a plurality of the fluid blowing ports and / or fluid outlets are formed, and a branch is formed in the molded body, so that the duct portion is branched into a plurality of branches such as two or three forks. Also good.

Hereinafter, the present invention will be described in detail with reference to the drawings.
[Example 1]
<Configuration of Floor Silencer with Duct of Example 1>
As shown in FIG. 1 and FIG. 2 (schematic diagram explaining the AA cross section in FIG. 1), the floor silencer 10 with a duct of the first embodiment includes a cylindrical duct portion 1, and the fluid is The fluid can be distributed from the fluid blowing port 11 to the fluid blowing port 12.
The floor silencer 10 body with duct is made of a soundproof material 2 [Material: RSPP (80% by mass of vehicle waste material such as urethane foam, 15% by mass of binder (low melting point PET core sheath fiber), 5% by mass of PET fiber), density; 0.08 g / cm ³ ].
The inner surface of the duct portion 1 is covered with a heat-fused non-venting layer 3 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm).
The floor silencer with a duct according to the first embodiment shown in the figure is used on the left side of the vehicle, and the right-side floor silencer is symmetrical to the left-side one about the center of the vehicle.

[Example 2]
<Configuration of Floor Silencer with Duct of Example 2>
As shown in FIG. 3 and FIG. 4 (schematic diagram for explaining the BB cross section in FIG. 3), in the floor silencer with duct 20 of the second embodiment, the upper wall 13 (on the vehicle compartment side of the duct portion 1) (Thickness: 2 mm) is composed of a high-density material [material: high-density fiber (50% by mass of anti-wool cotton, 50% by mass of binder (low melting point PET core-sheath structure fiber)], density: 0.4 g / cm ³ ]. Except for this, the configuration is the same as that of the first embodiment. A non-breathable layer 31 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm) is formed on the surface of the high-density material on the duct side.

<Performance evaluation of Examples 1 and 2>
(1) Evaluation of heat insulation The floor silencer with a duct of Example 1 was arrange | positioned to the left of the front side of the vehicle body in which the air conditioning equipment was arrange | positioned, and the fluid ventilation port in a duct part was fixed to the air conditioning equipment. On the other hand, as a comparative example 1, a conventional air duct and a floor silencer having the following configuration are arranged on the right side of the front side, and a fluid blower opening of the air duct is fixed to the air conditioning equipment.
Thereafter, warm air is blown from the air conditioning equipment for 6 minutes, and the temperature of the fluid at each fluid outlet in the duct portion of Example 1 and the air duct of Comparative Example 1 (that is, the temperature of the warm air passing through the duct) is measured. The results are shown in FIG.
Further, warm air is blown from the air conditioning equipment for 6 minutes, and the temperatures of the outer walls at the top of the duct 50 mm away from the fluid outlets in the duct portion of Example 1 and the air duct of Comparative Example 1 (ie, the duct itself). The temperature was measured and the results are shown in FIG.
Moreover, also in Example 2, it evaluated similarly to Example 1, and the result was shown in FIG.7 and FIG.8.

[Configuration of Comparative Example 1]
The material of the air duct in Comparative Example 1 (see the air duct 6 in FIGS. 19 and 20) is polyethylene (PE). Further, the shapes and dimensions of the fluid blowing port and the fluid blowing port in the air duct are substantially the same as those in the first embodiment.
Further, the material of each floor silencer in Comparative Example 1 (see floor silencer 7 (71, 72, 73 in FIGS. 19 and 20)) is RSPP (80% by mass of vehicle waste material such as urethane foam, binder (low melting point PET). Core-sheath structure fiber) 15% by mass, PET fiber 5% by mass].

(2) Evaluation of soundproofing properties Transmission loss and sound absorption rate were measured as follows and evaluated for soundproofing properties.
(Transmission loss)
The transmission loss in the thickness direction in the vicinity of the fluid outlets of Examples 1 and 2 and Comparative Example 1 (specifically, the area from the fluid outlet to the front side of the vehicle up to 50 mm) was measured according to JIS A 1416 ( However, based on the intensity method, the measurement chamber was an anechoic chamber, the volume of the anechoic chamber was set small, and the size of the measurement sample was set small.) At this time, the measurement was performed separately for (i) when the entire thickness [upper wall + air layer (duct thickness) + lower wall) is constant, and (ii) when the thickness of the air layer is constant, (i 9) shows the result in the case of (ii), and FIG. 10 shows the result in the case of (ii). Table 1 shows the structures of the upper wall and the lower wall in each example and comparative example. Further, the thicknesses of the upper wall, the air layer, and the lower wall were set as shown in Table 1.

[Sound absorption rate]
The sound absorption coefficient in the vicinity of the fluid outlets of Examples 1 and 2 and Comparative Example 1 (specifically, the region from the fluid outlet to the front side of the vehicle up to 50 mm) was measured according to JIS A 1409 (however, reverberation) The volume of the chamber was set small, and the size of the measurement sample was set small.) At this time, the measurement is performed separately for the cases (i) and (ii) described above, and the result in the case (i) is shown in FIG. 11, and the result in the case (ii) is shown in FIG.

<Effects of Examples 1 and 2>
(About heat insulation)
According to FIG. 5, the fluid temperature at the fluid outlet in Example 1 is closer to the air conditioning temperature [warm air; about 55 ° C. (at the start of air blowing; about 47 ° C.)] than in Comparative Example 1. It was found that can blow air without missing the hot air from the air conditioning equipment. Specifically, at the start of ventilation, Example 1 is 9 ° C. higher than Comparative Example 1 at the maximum, and even after the air conditioning temperature becomes constant, Example 1 is about 4% more than Comparative Example 1. Hot air could be blown at a high temperature.
Then, according to FIG. 6, the outer wall temperature above the duct portion in Comparative Example 1 is closer to the air conditioning temperature [warm air; about 55 ° C. (at the start of air blowing; about 47 ° C.)] than in Example 1. It was confirmed that Example 1 missed the heat of the warm air from the air conditioning equipment.

Further, according to FIG. 7, the fluid temperature at the fluid outlet in Example 2 is closer to the air-conditioning temperature [warm air; about 60 ° C. (at the start of air blowing; about 50 ° C.)] than in Comparative Example 1. It turned out that the direction of Example 2 can ventilate without missing the heat of the warm air from an air conditioner. Specifically, at the start of air blowing, Example 2 is higher by a maximum of 15 ° C. than Comparative Example 1, and even after the air-conditioning temperature becomes constant, Example 2 is about 5% higher than Comparative Example 1. Hot air could be blown at a high temperature.
And according to FIG. 8, the outer wall temperature above the duct portion in Comparative Example 1 is closer to the air conditioning temperature [warm air; about 60 ° C. (at the start of air blowing; about 50 ° C.)] than in Example 2, and the comparison is made. It was confirmed that Example 1 missed the heat of the warm air from the air conditioning equipment.

(About soundproofing)
According to FIG. 9 and FIG. 10, Example 1 and the implementation both in the case of (i) when the entire thickness of the duct part is constant and (ii) when the thickness of the air layer of the duct part is constant. It was confirmed that the transmission loss of Example 2 was higher than that of Comparative Example 1.
Further, according to FIG. 11 and FIG. 12, in both cases (i) the case where the entire thickness of the duct portion is constant and (ii) the case where the thickness of the air layer of the duct portion is constant, Example 1 It was confirmed that the sound absorption coefficient of Example 2 was higher than that of Comparative Example 1.

From the above, it was found that the floor silencer with ducts of Example 1 and Example 2 had excellent heat insulating properties and soundproofing properties.
Moreover, since the duct part and floor silencer part which were conventionally arrange | positioned separately are integrated in the floor silencer with each duct of Example 1 and Example 2, there is no clearance gap between both, and heat insulation and soundproofing Excellent in properties. Furthermore, since the duct part and the floor silencer part are integrated, the number of parts is reduced, the number of assembling steps is reduced, the weight of the parts is reduced, and the productivity such as working time can be further improved. Furthermore, since the duct portion can be easily formed at a desired position, design restrictions are reduced, and a layout can be performed more freely than before.
In addition, in the floor silencer with a duct of the second embodiment, the upper wall on the passenger compartment side of the duct portion is formed of a material having a higher density than the lower wall on the vehicle body side of the duct portion. Excellent strength.

  Furthermore, in this invention, the following Examples 3-5 can be illustrated as other embodiment. Examples 3 to 5 will be described below with reference to the drawings. In addition, about the structure same as the above-mentioned Example 1, the same code | symbol is attached | subjected and description of a structure, its effect, etc. is abbreviate | omitted.

Example 3
<Configuration and effect of floor silencer with duct of Example 3>
As shown in FIG. 13 and FIG. 14 (schematic diagram for explaining the CC cross section in FIG. 13), in the floor silencer 30 with duct of the third embodiment, the upper wall 13 (on the vehicle compartment side of the duct portion 1) Thickness: 2 mm) and side wall 14 (thickness: 2 mm) are high-density material [material: high-density fiber (50% by weight of anti-wool cotton, binder (low melting point PET core-sheath structure fiber) 50% by weight)], density: 0 .4 g / cm ³ ], the configuration is the same as that of Example 1 described above. A non-breathable layer 31 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm) is formed on the surface of the high-density material on the duct side.
In the floor silencer 30 with a duct according to the third embodiment, the upper wall 13 on the passenger compartment side of the duct portion 1 and the side wall 14 of the duct portion 1 are higher in density than the lower wall 15 on the vehicle body side of the duct portion 1. Since it is formed of a high-density material, it has excellent strength.

Example 4
<Configuration and Effect of Floor Silencer with Duct of Example 4>
As shown in FIGS. 15 and 16 (schematic diagram for explaining a DD cross section in FIG. 15), in the floor silencer 40 with a duct of the fourth embodiment, the upper wall 13 (on the vehicle compartment side of the duct portion 1 ( Thickness: 2 mm) and side wall 14 (thickness: 2 mm) are high-density material [material: high-density fiber (50% by weight of anti-wool cotton, binder (low melting point PET core-sheath structure fiber) 50% by weight)], density: 0 .4 g / cm ³ ] and the rib 4 having a V-shaped cross section is formed on the upper wall made of this high-density material. It is the same composition. A non-breathable layer 31 (material: polyethylene / polyamide / polyethylene laminated film, thickness: 45 μm) is formed on the surface of the high-density material on the duct side.
In the floor silencer 40 with a duct according to the fourth embodiment, the upper wall 13 on the side of the passenger compartment of the duct portion 1 and the side wall 14 of the duct portion 1 are more dense than the lower wall 15 on the vehicle body side of the duct portion 1. Since the rib 4 is formed in the upper wall 13 of the duct part 1, it is excellent in intensity | strength from the high density material.

Example 5
<Configuration and Effect of Floor Silencer with Duct of Example 5>
As shown in FIG. 17 and FIG. 18 (schematic diagram for explaining an EE cross section in FIG. 17), in the floor silencer 50 with a duct of the fifth embodiment, the duct portion 1 includes a fluid blower port 11 and a fluid blowout. Except that the fluid is circulated from the fluid blowing port 11 to the fluid outlets 121, 122. The configuration is the same as that of the first embodiment.
According to the floor silencer 50 with a duct of the fifth embodiment, the structure and arrangement position of the duct portion in the floor silencer with a duct of the present invention can be easily changed and formed as necessary. It can be seen that the layout and the silencer are excellent in layout compared to the conventional case where the part and the silencer are formed separately.

  The present invention is not limited to the specific examples described above, and various modifications can be made within the scope of the present invention depending on the purpose and application. For example, the duct portion in each of the floor silencers with ducts of the second to fourth embodiments may have a structure branched into a plurality of branches, such as a bifurcated floor silencer as in the fifth embodiment.

It is a schematic diagram explaining the silencer with a duct of Example 1. FIG. It is a schematic diagram explaining the AA cross section in FIG. It is a schematic diagram explaining the silencer with a duct of Example 2. FIG. It is a schematic diagram explaining the BB cross section in FIG. It is a graph which shows the temperature change of the fluid of a fluid outlet. It is a graph which shows the temperature change of the outer wall of a duct part upper side. It is a graph which shows the temperature change of the fluid of a fluid outlet. It is a graph which shows the temperature change of the outer wall of a duct part upper side. It is a graph which shows a transmission loss. It is a graph which shows a transmission loss. It is a graph which shows a sound absorption coefficient. It is a graph which shows a sound absorption coefficient. It is a schematic diagram explaining the silencer with a duct of Example 3. FIG. It is a schematic diagram explaining the CC cross section in FIG. It is a schematic diagram explaining the silencer with a duct of Example 4. FIG. It is a schematic diagram explaining the DD cross section in FIG. It is a schematic diagram explaining the silencer with a duct of Example 5. FIG. It is a schematic diagram explaining the EE cross section in FIG. It is a schematic diagram explaining the conventional air duct and a silencer. It is a schematic diagram explaining the FF cross section in FIG.

Explanation of symbols

  10, 20, 30, 40, 50; floor silencer with duct, 1; duct portion, 11; fluid blowing port, 12, 121, 122; fluid outlet, 13; upper wall, 14; side wall, 15; 2; soundproofing material, 3, 31; non-breathing layer, 4; rib, 5; floor carpet, 6; air duct, 7, 71, 72, 73;

Claims (4)

A floor silencer with a duct arranged in a vehicle and made of a molded body of soundproof material,
In the molded body, a cylindrical duct portion is formed, and air conditioning fluid can be circulated in the duct portion.
A floor silencer with a duct, wherein an inner surface of the duct portion is covered with a non-ventilated layer.   The floor silencer with a duct according to claim 1, wherein an upper wall of the duct portion on the vehicle compartment side is formed of a material having a higher density than a lower wall of the duct portion on the vehicle body side.   The floor silencer with a duct according to claim 2, wherein a side wall of the duct part is formed of a material having a higher density than a lower wall on the vehicle body side of the duct part.   The floor silencer with a duct according to any one of claims 1 to 3, wherein a rib is formed on an upper wall of the duct portion on a vehicle compartment side.

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