JPH0623448Y2 - Air conditioner for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an inside / outside air switching type vehicle air conditioner.

(Prior Art) Conventionally, such an air conditioner for a vehicle is, for example, “New Edition / Automotive Engineering Handbook 7th Edition” (May 31, 1983).
Published by Japan Society of Automotive Engineers) Page 1-121, Figure 1-3
There is something like that posted in 18.

However, in such a conventional vehicle air conditioner, when switching to the internal air circulation system, the sound of the blower is transmitted to the vehicle interior through the air intake passage of the air circulation duct, which increases noise in the vehicle interior. Therefore, there is a problem that the commercial value of the vehicle is reduced.

(Means for Solving Problems) Therefore, in order to solve the above problems, the present invention provides an air circulation duct defined in a vehicle body, which communicates with a vehicle compartment and can communicate with outside air, and is housed in the air circulation duct. And a blower that forces the flow of air, and a range control that is formed by stacking a number of hollow pipes that are provided in the cabin-side air intake passage of the air circulation duct and that change in length substantially continuously. And a sound absorbing member arranged in the vehicle body member so as to face the sound range control unit.

(Operation) According to such a vehicle air conditioner, the noise emitted from the blower is focused on one point in the predetermined direction and the predetermined distance by the sound range control means, and is absorbed by the sound absorbing member arranged at the one point. It is possible to prevent the noise of the blower from being transmitted to the vehicle compartment through the vehicle-side air intake passage of the air circulation duct.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
1 to 3 are views showing a vehicle air conditioner according to a first embodiment of the present invention.

In FIG. 1, 10 is an air conditioner for a vehicle, and 12 is an engine hood that covers an engine compartment 13 for accommodating an engine (not shown) so that the engine hood can be opened and closed. Reference numeral 14 is a front window, and a cowl top 16 having a slit 16a formed therein is arranged between the front window 14 and the engine hood 12. A reinforcement 18 is arranged inside the cowl top 16, and a slit 18a similar to the slit 16a is formed at an upper portion of the reinforcement 18. An instrument panel 20 is arranged so as to project into the vehicle compartment 21 at the rear of the reinforcement 18 (on the left in the figure), and an engine compartment 13 is provided on the lower vehicle front side of the reinforcement 18 (on the right in the figure). A dash panel 22 that separates the spaces is arranged. An air circulation duct 24 is defined between the reinforcement 18, the instrument panel 20 and the dash panel 22, and the air circulation duct 24 is always connected to the vehicle compartment 21 via an opening 20a at the bottom of the instrument panel 20. It is in communication. A blower 26 is housed inside the air circulation duct 24, and the blower 26 is further housed in an air conditioning duct 28 that houses a heater core and the like (not shown). An outside air intake port 18b is opened at the bottom of the reinforcement 18, and the outside air intake port 18b communicates with an air conditioning duct 28 via a communication duct 30. A compartment-side air intake 30a is opened on the left side of the communication duct 30 in the figure, and the compartment-side air intake 30a and the outside air intake 18b are selectively opened and closed by rotating the opening / closing door 32. You can do it. Opening port 20 of air distribution duct 24
The path from a to the passenger compartment side air intake port 30a constitutes a passenger compartment side air intake path W. Air intake 30a on the passenger compartment side of the communication duct 30
A tone range control means 34 is provided outside the. As shown in FIG. 2, the range control means 34 has a cross-sectional shape such that one surface (right side in the figure) is flat and the other surface (left side in the figure) is arcuate. There is. In the cross section of the range control means 34, a large number of wall members 34a whose length changes substantially continuously are provided so as to be inclined and overlapped with each other at intervals, and between the large number of wall members 34a. Many hollow conduits 34b are formed in the gap. In FIG. 1, a sound absorbing member 36 that absorbs noise, which will be described later, is provided on the instrument panel (member in the vehicle body) 20 facing the sound range control means 34.

Range control means in such a vehicle air conditioner 10
As shown in FIG. 2, reference numeral 34 indicates a sound wave propagating from the right side of the range control means 34 in the direction of arrow A in a predetermined direction and a predetermined distance L from the range control means 34 after passing through the range control means 34. It has a function of focusing one point (point F) on the focal point, and the position of this focal point F is determined by the following equation.

= ₁ + ₂ : Distance between the upper and lower ends of the range control means 34 and the point F, ₁ : Length of the arbitrary hollow conduit 34b, ₂ : Outlet of the above arbitrary hollow conduit 34b and point F Therefore, the point F is set as a focal point on the instrument panel 20 facing the range control means 34, and the noise absorbing member 36 is provided at this position to focus and absorb the noise of the blower 26. Therefore, it is possible to prevent the noise of the blower 26 from being transmitted into the vehicle interior 21 through the vehicle interior side air intake passage W of the air circulation duct 24. For this reason,
As shown in FIG. 1, even when the opening / closing door 32 closes the outside air intake port 18b and opens the vehicle interior side air intake port 30a, the vehicle interior noise can be reduced and the commercial value of the vehicle can be improved. When the opening / closing door 32 opens the outside air intake 18b and closes the passenger compartment side air intake 30a, the noise of the blower 26 radiates outside the vehicle through the slits 18a and 16a and enters the passenger compartment 21. No noise is transmitted. In the first embodiment, the passenger compartment side air intake is located on the left side of the communication duct 30 in the figure.
Although the description has been given of the one in which 30a is opened and the sound range control means 34 and the sound absorbing member 36 are provided, it is not necessary to limit to this position, and the vehicle compartment side air intake port of the communication duct 30 may be rightward in the figure or vertically in the figure. 30a is opened, range control means 34 and sound absorbing member 36
May be provided.

FIG. 4 shows the second embodiment. Dash panel 22
Shows in detail, as shown in Fig. 3, the engine room of the iron plate
Coarse-hair felt 42 is attached to the side opposite to 13, and vinyl with hair 44 is attached to it to block noise from engine compartment 13. Therefore, when the sound absorbing member 36 is provided on the dash panel 22 in the first embodiment, the sound absorbing member 36 is provided on the napped vinyl 44. On the other hand, in the second embodiment, as shown in FIG. 4, the vinyl with hair 44 at the portion corresponding to the point F is cut into a predetermined size, and the noise of the focused blower 26 is reduced by the coarse hair felt 42. It is intended to be absorbed by. That is, the coarse bristle felt 42 is used as a sound absorbing member.

FIG. 5 shows the third embodiment. In the embodiment described above, the sound range control means 34 is connected to the passenger compartment side air intake of the communication duct 30.
The third embodiment differs from the third embodiment in that the tone range control means 34 is provided outside the opening 20a of the instrument panel 20. In the third embodiment, the noise of the blower 26 transmitted to the opening 20a through the air intake passage W on the passenger compartment side of the air circulation duct 24 is focused by the tone range control means 34, and the carpet of the vehicle body floor 48 is collected. The focus F is set at one point of 46, and the carpet 46 absorbs noise. As a result, the carpet 46 is used as the sound absorbing member, and it is not necessary to provide another member. The existing member used as the sound absorbing member is not limited to the carpet 46, and a seat (not shown) near the carpet 46 or another member may be used.

(Effects of the Invention) As described above, according to the present invention, a large number of hollow pipelines, which are provided in the vehicle-side air intake passage of the air circulation duct and whose length changes substantially continuously, are inclined. By providing the sound range control means formed by overlapping and the sound absorbing member arranged on the member in the vehicle body so as to face the sound range control means,
It is possible to improve the commercial value of the vehicle by preventing the noise of the blower from being transmitted to the vehicle interior and reducing the noise in the vehicle interior. Further, since the sound range control means 34 has good air permeability due to its hollow pipe line 34b, the sound range control means 34 does not hinder the flow of air.

[Brief description of drawings]

1 to 3 are views showing a vehicle air conditioner according to a first embodiment of the present invention. FIG. 1 is a schematic cross-sectional view thereof, and FIG. 2 is a cross-sectional view showing the operation of a range control means 34. FIG. 3 is a partially enlarged cross-sectional view of the sound absorbing member 36 provided on the dash panel 22, and FIG. 4 is a partially enlarged cross-sectional view of the vehicle air conditioner according to the second embodiment of the present invention, which corresponds to FIG. FIG. 5 is a schematic sectional view showing a vehicle air conditioner according to a third embodiment of the present invention. 10 …… Vehicle air conditioner, 12 …… Engine hood, 13 …… Engine compartment, 14 …… Front window, 16 …… Cowl top, 16a …… Slit, 18 …… Rain force, 18a …… Slit, 18b ...... Outside air intake, 20 …… Inst panel (inner body member), 20a …… Opening port, 21 …… Vehicle compartment, 22 …… Dash panel (inner body member), 24 …… Air distribution duct, 26 …… Blower, 28 ... Air conditioning duct, 30 ... Communication duct, 30a ... Cabin side air intake, 32 ... Open / close door, 34 ... Range control means, 34a ... Wall member, 34b ... Hollow tube Road 36: Sound absorbing member 42: Coarse-felt felt 44: Vinyl with hair 46: Carpet 48: Vehicle floor (inside vehicle body) W: Air intake passage on the passenger compartment side.

Claims (1)

[Scope of utility model registration request] 1. An air distribution duct that is defined in a vehicle body and communicates with a vehicle compartment, and can communicate with outside air, a blower that is housed in the air circulation duct and forces air to flow, and a vehicle compartment of the air circulation duct. A sound range control means provided in the side air intake path and formed by stacking a large number of hollow pipes whose lengths change substantially continuously, and a sound body control means arranged in a member inside the vehicle body so as to face the sound range control means. A sound absorbing member, and an air conditioner for a vehicle.