JP2009298320A - Sound insulating device for air conditioner installed inside vehicular instrument panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound insulating device for an air conditioner installed inside a vehicular instrument panel for reducing noises generated from a blower of an air conditioner unit and reaching the ears of an occupant. <P>SOLUTION: The air conditioner for a vehicle is structured so that the blower, a temperature regulating unit, and an air-conditioning duct leading from the temperature regulating unit to the cabin are installed in the space bounded by the instrument panel and a dash panel, the vehicle being characterized by that a sound insulating panel is installed for isolating the blower spatially from the air-conditioning duct. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sound insulation device for an air conditioner installed in a vehicle instrument panel for reducing noise generated from a blower of a vehicle air conditioner unit and reaching an occupant's ear.

  FIG. 3 is a schematic view showing an air conditioner installed in a vehicle instrument panel of the prior art found in Patent Document 1. As shown in FIG. The engine room and the vehicle compartment are separated by a dash panel 7. The air conditioner is installed in an internal space surrounded by the instrument panel 1, the under cover 5, and the dash panel 7 in the vehicle interior. The blower 2 of the air conditioner is arranged offset from the center of the instrument panel 1 in the vehicle compartment in the vehicle width direction. The instrument panel is provided with a storage portion 8 (glow box). In such a conventional technique, the sound pressure in the space surrounded by the instrument panel is generated by the blower 2 and increases due to the noise radiated from the inside air suction port 21, thereby reducing the engine sound transmitted to the passenger compartment. It was sought to do.

  On the other hand, in Patent Document 2, when an opening is provided in a part of a duct and a sound absorbing material is attached, sound generated by a blower or an air conditioning unit (HVAC, Heating Ventilation and Air Conditioning) passes through the duct. A technique for reducing the sound passing through by letting the sound escape from the opening is disclosed. Also in Patent Documents 3 to 5, technologies aiming at the same effect are disclosed.

  In Patent Document 6, a sound absorbing material is attached to the inside of the dash panel and the outside of the duct, and the engine sound is absorbed and reduced when passing through the space between the instrument panel and the dash panel. A technique for reducing sound transmitted to an occupant is disclosed. By arranging the sound absorbing material in the empty space around the duct, the empty space can be used effectively.

However, when the ducts according to Patent Documents 2 to 5 are applied to the conventional vehicle body structure, the blower noise is transmitted from the inside air inlet to the space between the instrument panel and the dash panel, and enters the inside of the duct from the opening of the duct. The sound in the duct increases and a sufficient sound reduction effect cannot be obtained.
Moreover, although patent document 6 can reduce the sound which the sound in an instrument panel permeate | transmits an instrument panel wall and radiates | emits in a vehicle interior, the noise which passes the inside of an air-conditioner unit and a duct cannot be reduced.

Japanese Patent Laid-Open No. 11-115448 JP-A-6-156051 JP-A-6-156052 Japanese Patent Laid-Open No. 6-156054 JP 2004-66908 A JP 2001-97020 A

  In view of the above problems, an object of the present invention is to provide a sound insulation device for an air conditioner installed in a vehicle instrument panel for reducing noise generated from a blower of a vehicle air conditioner unit and reaching an occupant's ear. There is to do.

  The invention of claim 1 includes a blower (2), a temperature control unit (6), and a temperature control unit (6) in an interior space surrounded by the instrument panel (1) and the dash panel (7). In a vehicle provided with an air conditioning apparatus including an air conditioning duct (4) leading to the sound insulation panel (3), a sound insulation panel (3) for shielding the blower (2) from the air conditioning duct (4) is installed in the internal space. It is characterized by.

  By installing this sound insulation panel in the instrument panel, the sound transmitted through the instrument panel from the blower internal air inlet through the sound insulation wall can be blocked. Furthermore, since the sound transmitted from the blower internal air inlet to the space around the air conditioning duct is blocked and the sound pressure in the space around the air conditioning duct is lowered, the sound that enters the duct can be reduced.

  According to a second aspect of the present invention, in the sound insulation device for an air conditioner according to the first aspect, the blower (2) communicates with an inside air suction port (21) and an outside air suction port (22), and the sound insulation panel (3) at least between the inside air inlet (21) and the air conditioning duct (4), between the blower inside air inlet (21) and the temperature control unit (6), and inside air suction. It is present between the mouth (21) and the instrument panel (1).

  As a result, this sound insulation panel is installed between the blower inside air inlet and the air conditioning duct, between the blower inside air inlet and the temperature control unit, and between the glove box and the blower inside air inlet. The volume of the space can be increased, the sound transmitted from the air conditioning duct can be dispersed in a large space, and a sufficient sound reduction effect can be exhibited.

  According to a third aspect of the present invention, in the sound insulation device for an air conditioner according to the first aspect, a part of the air conditioning duct has a sound transmission portion (43, 44, 45, 46) having a high sound transmission property. It is characterized by that.

  Thereby, the sound which passes the inside of a duct can be reduced by letting the sound which passes the inside of a duct escape in an instrument panel. In addition, since the sound transmitted through the instrument panel from the blower inside air suction port and transmitted to the occupant can be blocked by the sound insulating wall, it has a double sound reduction effect. That is, it is possible to exhibit a synergistic effect more than a low noise effect obtained by using a duct having a sound absorbing material in the opening and a sound insulation panel between the blower inside air suction port and the air conditioning duct.

  In addition, the code | symbol attached | subjected above is an example which shows a corresponding relationship with the specific embodiment as described in embodiment mentioned later.

  FIG. 1 is an overall schematic view of a sound insulation device for an air conditioner installed in a vehicle instrument panel according to an embodiment of the present invention. FIG. 2 is an explanatory view of the sound insulation device for the air conditioner of FIG. 1 as viewed from the rear to the front of the vehicle with a part of the panel removed. The vehicle air conditioner in this embodiment is for a right steering wheel.

  With reference to FIG. 1, FIG. 2, the air conditioner installed in the vehicle instrument panel which is one embodiment of this invention is demonstrated first. The engine room and the vehicle compartment are separated by a dash panel 7. The air conditioner is installed in an internal space surrounded by the instrument panel 1, the under cover 5, and the dash panel 7 in the vehicle interior. The blower 2 of the air conditioner is arranged offset from the center of the instrument panel 1 in the vehicle compartment in the vehicle width direction. In the case of a left handle, the offset is reversed. As shown in FIG. 1, the outside air inlet 22 opens at an upper portion of the dash panel 7. Moreover, the inside air inlet 21 is opened in the upper part in the below-mentioned sound insulation panel 3 provided in the instrument panel.

  The outside air inlet 22 and the inside air inlet 21 can be opened and closed by a switching door (not shown), and switching between outside air and inside air is appropriately switched according to differences in temperature and humidity. Yes. Outside air or inside air is sucked in by a blower 2 such as a centrifugal multiblade fan, and is introduced through a duct 61 into a temperature control unit 6 that adjusts the temperature of the conditioned air.

  The temperature control unit 6 is arranged at a central portion in the vehicle width direction. A well-known evaporator (not shown), which is a heat exchanger for cooling, is disposed in the temperature control unit 6. In the temperature control unit 6, a temperature adjustment unit configured by a known heater core (not shown) or the like is provided on the air downstream side (vehicle rear side) of the evaporator. The temperature adjusting unit adjusts the temperature of the conditioned air by adjusting the heating amount of the air that has passed through the evaporator.

  This temperature adjustment unit is composed of, for example, a heater core that uses engine coolant of a vehicle as a heat source, a well-known air mix door that adjusts the amount of air passing through the heater core among the cold air that has passed through the evaporator, and the like. Then, the air introduced into the temperature control unit 6 through the duct 61 in the vehicle width direction changes the direction of the flow, and flows from the vehicle front side to the vehicle rear side from the back side to the front side in FIG. And pass through the heater core. A duct 4 is connected to an air downstream side of the temperature adjusting unit, and an air passage is formed by the duct 4 toward the upper body of the occupant, the windshield of the vehicle, and the lower body of the occupant.

Next, a sound insulation device for an air conditioner will be described.
As shown in FIGS. 1 and 2, a sound insulation panel 3 is installed between the inside air inlet 21 and the air conditioning duct 4. The sound insulation panel 3 includes three members, a sound insulation panel 31, a sound insulation panel 32, and a sound insulation panel 33.
The sound insulation panel 31 is installed so as to cover the upper part of the blower 2 except for the outside air inlet 22, and the sound insulation panel 32 is installed in a direction orthogonal to the duct 61 between the blower 2 and the temperature control unit 6. The sound insulation panel 33 is installed between the blower inside air suction port and the instrument panel. The sound insulation panel 31, the sound insulation panel 32, and the sound insulation panel 33 are connected to each other to form the sound insulation panel 3, and separate the space 11 around the air inlet 21 and the duct 4.

  Thereby, since the noise generated by the blower 2 and radiated from the inside air suction port 21 is attenuated by the sound insulation panel 3, the sound propagating to the space 11 around the duct can be reduced. As a result, the sound pressure in the space 11 decreases, the sound that passes through the instrument panel 1 and reaches the vehicle interior can be reduced, and the vehicle interior noise can be reduced.

In addition to the above-described sound insulation device using the sound insulation panel 3, another embodiment having the duct 4 described below will be described. In this case, a part of the duct 4 has a sound transmission part with high sound transmission unlike the normal case.
As an example of the sound transmission part of such a duct 4, the following can be considered as an example.
(1) A part of the duct is removed, and the removed part is connected by a sound absorbing material duct 43 made of a sound absorbing material (FIG. 4). As the sound-absorbing material duct, a woven fabric, a non-woven fabric, a resin material, or the like can be considered.
(2) A part of the duct is a thin plate portion 44. Furthermore, the strength of the duct may be reinforced by ribs 45 (axial direction or circumferential direction). (FIG. 5).
(3) An opening is provided, and the thin film 46 is adhered to the opening from the inside or the outside (FIG. 6). The opening may be in various forms such as a hole or an axial slit. Instead of the thin film 46, it is conceivable to cover from the outside with a woven fabric, a nonwoven fabric, a resin material, or the like.
In addition, there are various other structures having high sound permeability, but care must be taken so that the air pressure in the duct is not reduced as much as possible.

  In another embodiment of the present invention, the duct 4 having the sound transmitting portion of the above-described embodiment and the sound insulation device using the sound insulation panel 3 according to the one embodiment are used in combination. In this embodiment, sound energy passing through the internal flow path 41 of the duct 4 is released into the space 11 surrounded by the sound insulation panel 3 and the instrument panel 1. Since the sound pressure level in the space 11 is lowered by the sound insulation panel 3, the sound energy passing through the internal flow path 41 of the duct 4 is released from the sound transmission part because the sound pressure difference is large. Therefore, the sound energy transmitted from the internal flow path 41 after releasing the sound into the sound insulation panel 3 into the vehicle interior is reduced.

By providing the sound insulation panel 3, the space 11 around the air conditioning duct is separated and independent, and by taking up the volume of the space 11, the transmitted sound can be dispersed and muffled in a large space. The sound reduction effect can be demonstrated. Therefore, the sound radiated into the vehicle interior through the internal flow path 41 can be reduced, and the vehicle interior noise can be reduced.
In the prior art of FIG. 3, the sound pressure in the space surrounded by the instrument panel is generated by the blower 2 and increases due to the noise radiated from the inside air inlet 21, and the sound pressure difference with the internal flow path 41 is small. The sound reduction effect inside the flow path 41 by the duct 4 having high sound permeability could not be sufficiently exhibited.
According to the embodiment of the present invention, when the sound insulation panel 3 and the highly sound-permeable duct 4 are used in combination, the sound is transmitted through the two paths of the sound that passes through the instrument panel 1 and the sound that passes through the duct internal flow path. Since it can reduce, the synergistic effect more than the low noise effect used independently can be exhibited. FIG. 7 is a graph showing the difference in reduction effect when one embodiment and another embodiment of the present invention are compared with the prior art.

  The sound insulation device using the sound insulation panel 3 according to the present invention is not necessarily limited to a blower that rotates on a vertical axis, but may be applied to a blower that rotates on a horizontal axis, and further includes an inside air inlet 21 and an outside air inlet 22. There may be no single inlet.

FIG. 1 is an overall schematic view of a sound insulation device for an air conditioner installed in a vehicle instrument panel according to an embodiment of the present invention. It is explanatory drawing which looked at the sound insulation apparatus for air conditioners of FIG. 1 from the back of the vehicle toward the front, removing a part of panel. It is the schematic which shows the air conditioner installed in the vehicle instrument panel of a prior art. It is a figure which shows one Embodiment of the sound transmission part of the duct. It is a figure which shows another embodiment of the sound permeable part of the duct. It is a figure which shows another embodiment of the sound permeable part of the duct. It is a graph which shows the difference of the reduction effect which compared one embodiment and another embodiment of this invention with the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Instrument panel 2 Blower 3 Sound insulation panel 4 Air conditioning duct 5 Under cover 6 Temperature control unit 7 Dash panel 11 Space around duct 21 Inside air inlet 22 Outside air inlet 31, 32, 33 Sound insulation panel 41 Flow path in air conditioning duct 61 Duct

Claims (3)

  In a vehicle in which an air conditioner including a blower, a temperature control unit, and an air conditioning duct extending from the temperature control unit to the passenger compartment is installed in an internal space surrounded by an instrument panel and a dash panel, A sound insulation device for an air conditioner, wherein a sound insulation panel for shielding the blower is installed in the internal space.   The blower communicates with an inside air inlet and an outside air inlet, and the sound insulation panel includes at least between the inside air inlet and the air conditioning duct, and between the blower inside air inlet and the temperature control unit. The sound insulation device for an air conditioner according to claim 1, wherein the sound insulation device exists between the inside air suction port and the instrument panel.   The sound insulation device for an air conditioner according to claim 1, wherein a part of the air conditioning duct has a sound transmission part having high sound transmission.

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