JPH10109517A - Vehicular inner/outer air changing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain a noise felt by an occupant in a cabin to the utmost at the outer air introduction mode time, in inner/outer air switching units constituted so as to be introduced a part of the inner air at the outer air introduction mode time. SOLUTION: In inner/outer air switching units 1 for switching these respective introduction ports 8, 9 by an inner/outer air switching door, in which a first inner air introduction part 8 is mounted on a vehicle so as to point to a cabin inside and an outer air introduction point 9 is mounted on the vehicle so as to point to a sky direction side, a second inner air introduction port 13 for introducing a part of inner air in the inner/outer air switching boxes 7 is opened toward an engine room side even at the outer air introduction mode time. Thereby, the noise of a scirocco fan 5 and the noise of the outside of car are hard to be transmitted into the cabin through the second inner air introduction port 13, in comparison with the case in which the second inner air introduction port 13 is opened toward the car room inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inside / outside air switching unit for a vehicle air conditioner.

[0002]

2. Description of the Related Art In many of the conventional inside / outside air switching units of a vehicle air conditioner, the inside air opening is directed to the vehicle interior and the outside air opening is directed to the ceiling. Further, a method of partially introducing warm inside air to the inside / outside air switching unit in order to reduce a heating load in the outside air introduction mode is also known (for example, Japanese Utility Model Application Publication No. Sho 62-62).
-37768 gazette).

As described above, a method as disclosed in Japanese Utility Model Publication No. 62-37768 is applied to the inside / outside air switching units which are opened such that the inside air introduction port faces the inside of the vehicle compartment and the outside air introduction port faces the top. When applied, the configuration is as shown in FIG. That is, the inside / outside air switching unit 100
The vehicle includes an inside air inlet 101 that opens toward the vehicle interior, an outside air inlet 102 that opens upward, and an inside / outside air switching door 103 that opens and closes these inlets 101 and 102. An opening 104 is formed in a part of the inside / outside air switching door 103, and a sub door 105 that opens and closes the opening 104 is provided.

In the outside air introduction mode, the inside / outside air switching door 103 is located at a solid line in FIG.
1 is closed and the outside air introduction port 102 is opened. At this time,
When a fan (not shown) provided below the inside / outside air switching unit 100 in FIG. 5 is operated, outside air is introduced into the inside / outside air switching unit 100. At this time, the negative pressure generated in the inside / outside air switching unit 100 As a result, the sub-door 105 is also opened, whereby part of the inside air is introduced from the opening 104.

In the inside air circulation mode, the inside / outside air switching door 103 is at the position indicated by the two-dot chain line in FIG. 5, and at this time, the sub-door 105 closes the opening 104 by its own weight.

[0006]

In the case of the inside / outside air switching unit 100 shown in FIG. 5, since the opening 104 is open toward the interior of the vehicle, the sub door 10 can be opened in the outside air introduction mode.
When the opening 5 opens the opening 104, noise generated by a fan (not shown), noise outside the vehicle transmitted from the outside air inlet 102, and the like are easily transmitted to the passenger compartment through the opening 104, and the occupant receives noise. There was a problem of giving discomfort.

In view of the above problems, the present invention has been made to minimize the amount of noise perceived by an occupant in a vehicle interior during an outside air introduction mode in an inside / outside air switching unit configured to partially introduce inside air during an outside air introduction mode. It is an object of the present invention to provide an inside / outside air switching unit capable of performing the following.

[0008]

In order to achieve the above object, the invention according to the first to sixth aspects of the present invention is directed to an external air introduction mode in which the first internal air introduction port is closed and the external air introduction port is opened.
In the vehicle inside / outside air switching unit configured to be able to introduce inside air from inside air introduction port into the inside / outside air switching box, the first inside air introduction port and the second inside air introduction port are connected to the vehicle inside / outside air switching unit. It is characterized in that it is formed so as to open in directions opposite to each other when it is mounted on a vehicle.

Accordingly, the inside / outside air switching unit of the present invention is
When the vehicle is mounted on the vehicle such that the first inside air inlet faces the interior of the vehicle and the second inside air inlet faces the engine room,
Even if part of the inside air is introduced into the inside / outside air switching box from the second inside air introduction port in the outside air introduction mode, since the second inside air introduction port is directed to the engine room side, the noise of the fan, the noise outside the vehicle, etc. 2 It is possible to suppress entry into the vehicle interior through the inside air inlet.

[0010] In particular, the invention according to claim 4 is characterized in that when the second inside air inlet opening / closing means referred to in the third aspect of the invention opens the second inside air introduction port by the operation of the blowing means, the regulating member comprises: The second inside air inlet opening / closing means is in contact with the second inside air inlet opening / closing means to regulate the movement of the second inside air inlet opening / closing means.
Here, if the regulating member is not provided, the negative pressure generated in the inside / outside air switching box by the operation of the air blowing means and the elastic force of the second inside air introduction port opening / closing means themselves act on each other,
The second inside air inlet opening / closing means vibrates, and a rattling sound is generated. In this regard, in the case of the present invention, since the second inside air introduction port opening / closing means when the second inside air introduction port is opened can be stopped, the above-described problem can be prevented.

The invention according to claim 5 is characterized in that the regulating member is formed integrally with the inside / outside air switching box. Therefore, assemblability of the regulating member can be improved as compared with the case where the regulating member is provided separately from the inside / outside air switching box. The invention according to claim 6 is such that the inside / outside air switching box has a shape such that a dead space is created when the inside / outside air switching unit is mounted on a vehicle, and the second inside air introduction port is provided in the dead space. It is characterized in that it is formed at a position directly opening.

Therefore, a space for sucking inside air from the second inside air inlet can be easily secured.

[0013]

FIG. 1 shows an embodiment of the present invention.
This will be described based on Nos. FIG. 1 is an external view of a state in which a blower unit 2 is connected to an inside / outside air switching unit 1 in the present embodiment, and these units 1 and 2 are connected to each other by screws or the like. Note that these units 1 and 2 are mounted on the vehicle such that the right side in the figure faces the engine room, the left side in the figure faces the passenger compartment, the upper side in the figure faces the top, and the lower side in the figure faces the ground. .

The blower unit 2 has a blower case 3 made of resin, and a sirocco fan 5 driven by a blower motor 4 is provided in the blower case 3. In the present embodiment, the blower motor 4 and the sirocco fan 5 constitute a blower in the present invention. Reference numeral 6 denotes a discharge port for discharging the air flow generated by the sirocco fan 5, and a well-known cooler unit, a heater unit, and a blow-out mode switching unit (not shown) are sequentially connected to the front side of the discharge port 6 in the drawing. .

The inside / outside air switching unit 1 includes an inside / outside air switching box 7 made of resin. The inside / outside air switching box 7 has a first inside air introduction port 8 for introducing inside air and an outside air introduction port 9 for introducing outside air. Are formed, and each of these introduction ports 8, 9 is formed.
Is provided with an inside / outside air switching door 10 (see FIG. 3) for opening and closing the door. Further, the plate 1 that rotates about the fulcrum 11a
1 is provided with a pin 11b protruding from the surface of the plate 11 to the back of the drawing. The pin 11b is engaged with a lever 12 connected to a shaft 10a (see FIG. 3) of the inside / outside air switching door 10. It is engaged with the groove 12a.

A control cable (not shown) connected to an inside / outside air switching lever (not shown) provided on an air-conditioning panel in the vehicle compartment is provided on a pin 11c protruding toward the front side of the drawing with respect to the surface of the plate 11. Since the connection is established, the occupant in the cabin operates the inside / outside air switching lever, so that the plate 11 and the lever 12 rotate through the control cable, and the position of the inside / outside air switching door 10 can be switched.

The inside / outside air switching box 7 also has an inside / outside air switching mode in the outside air introduction mode in which the inside / outside air switching door 10 (FIG. 3) fully closes the first inside air introduction port 8 and fully opens the outside air introduction port 9. Box 7
A second inside air inlet 13 (FIG. 2) for partially introducing inside air is formed in the inside, and the second inside / outside air inlet 13 is further formed.
The bracket 14 is fixed to the inside / outside air switching box 7 by a screw 15 so as to cover from above.

Here, the details of the second inside air inlet 13, the bracket 14, and the like will be described in detail with reference to FIGS. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 2A is a view showing the second inside air inlet 13 with the bracket 14 removed, and FIG.
4 is a diagram showing a single unit of FIG. FIG. 3 is a longitudinal sectional view of the second inside air inlet 13 of FIG.

As shown in FIG. 2A, the inside / outside air switching box 7
Has a substantially square second inside air inlet 13 formed therein. As shown in FIG. 2B, the bracket 14 has two openings 14a and four holes 14b and 14c. Then, when the hole 14b is fitted into the pin 7a protruding toward the near side of the drawing of FIG. 2A (right side in FIG. 3), the hole 7b formed in the inside / outside air switching box 7 and the hole 14c are fitted. The bracket 14 is fixed to the inside / outside air switching box 7 by inserting and tightening the screw 15 (FIG. 1) in the hole 14c in this state.

When the bracket 14 is fixed to the second inside air introduction port 13, the inside and outside of the inside air switching box 7 communicate with each other through the opening 14a. In the present embodiment, the second inside air inlet 13 and the opening 14a constitute the second inside air inlet referred to in the present invention. FIG.
(A) As shown in FIG. 3, in the inside / outside air switching box 7,
At a position facing a substantially upper half of the second inside air introduction port 13, a first rib 16 formed of a plate surface parallel to the surface of the second inside air introduction port 13, and a plate surface of the first rib 16 are formed. Two second ribs 17 composed of orthogonal plate surfaces
a and 17b are provided. These ribs 16, 17
Reference numerals a and 17b constitute a regulating member according to the present invention, and are formed integrally with the inside / outside air switching box 7.

As shown in FIG. 3, the bracket 14 has a seal packing 14e made of an elastic member (specifically, an ester urethane foam) on the back surface of the iron plate 14d.
Is attached. An opening is formed in the seal packing 14e so as not to cover the opening 14a. The inside / outside air switching unit 1 is provided with a door packing 18 made of an elastic member (specifically, a polyethylene terephthalate cloth coated with silicon rubber). More specifically, the pin 7a is inserted into a hole (not shown) formed at one end of the door packing 18 and the bracket 14 is fixed to the inside / outside air switching box 7 from above, whereby the door packing 1 is formed.
The above-mentioned one end of 8 is sandwiched between a portion indicated by 7c in the drawing of the inside / outside air switching box 7 and the seal packing 14b, and the door packing 18 is fixed to the inside / outside air switching unit 1.

Here, as described above, the door packing 1
When the sirocco fan 5 (FIG. 1) is stopped when the fixing 8 is fixed, the door packing 18 comes into contact with the seal packing 14b due to the elasticity and the weight of the door packing 18 itself. As a result, the door packing 18 is
The opening 14a (FIG. 2A) is closed. Further, when the negative pressure generated in the inside / outside air switching box 7 with the operation of the sirocco fan 5 overcomes the elastic force of the door packing 18, the door packing 18 opens the opening 14a. That is,
In the present embodiment, the door packing 18 forms the second inside air inlet opening / closing means referred to in the present invention.

As shown in FIG. 1, the inside / outside air switching box 7 has an opening 13 at the vehicle front end of the outside air introduction duct 19 and the vehicle front end at the bottom of the inside / outside air switching box 7. And a shape protruding forward of the vehicle from the surface of the bracket 14, so that when the inside / outside air switching unit 1 is mounted on the vehicle, a dead space is formed in a portion of the opening 13 and the surface of the bracket 14 on the vehicle front side. It is formed.

According to the present embodiment configured as described above, the first inside air inlet 8, the second inside air inlet 13, the opening 1
4a are open in opposite directions, and these are the first
The inside air inlet 8 is mounted on the vehicle such that the second inside air inlet 13 faces the interior of the vehicle, and the opening 14a faces the engine room. Therefore, even if the inside air is partially introduced into the inside / outside air switching box 7 from the second inside air introduction port 13 and the opening 14a in the outside air introduction mode, the sirocco fan 5 is located because the 13 and 14a face the engine room side. It is possible to suppress noise of the vehicle and noise outside the vehicle from entering the vehicle interior through the opening 14a. As a result, it is possible to reduce the level of noise perceived by the occupant in the vehicle interior in the outside air introduction mode.

Actually, the inventors of the present embodiment and the conventional apparatus (FIG. 5) have set the noise level in the vehicle interior, the defroster mode in the outlet mode, the outside air introduction mode in the inside / outside air mode, and the blower voltage in the inside / outside air mode. Under the condition of 12 (V), the microphone was placed near the driver's ear, and the measurement was performed. As a result, the data shown by the solid line in FIG. 4 for the device of the present embodiment and the two-dot chain line of FIG. Was done. From the experimental data, it was found that the apparatus of the present embodiment has a noise reduction effect of about 3 to 4 dB in overall value as compared with the conventional apparatus.

In this embodiment, the sirocco fan 5
When the door packing 18 opens the opening 14a by the operation of the door packing 18, the door packing 18 comes into contact with the first and second ribs 16, 17a, 17b, and the movement thereof is regulated. Here, temporarily, the first and second ribs 16, 17a, 1
When the sirocco fan 5 is not provided, the negative pressure generated in the inside / outside air switching box 7 by the operation of the sirocco fan 5 and the elastic force of the door packing 18 themselves act on each other, and the door packing 18
Vibrates, and a rattling sound is generated.

In this regard, in the case of the present embodiment, the opening 14a
Since the door packing 18 can be stopped when the door is opened, the above-described problem can be prevented. In the present embodiment, the bracket 14 is attached to the iron plate 1.
Since the seal packing 14e made of an elastic member is adhered to the back surface of 4d, even when the door packing 18 returns to the position to close the opening 14a by its own elastic force,
The seal packing 14e serves as a cushion,
The tapping sound of the door packing 18 is reduced.

In this embodiment, since the first and second ribs 16, 17a, 17b are formed integrally with the inside / outside air switching box 7, the ribs 16, 17a, 17b are formed separately from the inside / outside air switching box 7. Compared to the case where the ribs 16 and 17 are provided,
a, 17b can be easily assembled. Also,
In the present embodiment, the inside / outside air switching box 7 is shaped so that a dead space is created when the inside / outside air switching unit 1 is mounted on a vehicle, and the opening 14a is formed at a position directly opening into the dead space. As a result, a space for sucking inside air from the opening 14a can be easily secured.

(Other Embodiments) In the above embodiment, the first and second ribs 16, 17a, 17b as regulating members are provided.
Is integrally formed with the inside / outside air switching box 7, but this regulating member may be provided separately from the inside / outside air switching box 7. Further, in the above embodiment, the second inside air inlet 13 and the opening 14a are directed straight toward the engine room, but there is a noise reduction effect even if the second inside air inlet 13 and the opening 14a are slightly displaced up and down or left and right.

[Brief description of the drawings]

FIG. 1 is an external view of a state in which a blower unit 2 is connected to an inside / outside air switching unit 1 according to an embodiment of the present invention.

2 is a view taken in the direction of arrow A in FIG. 1; FIG. 2 (a) is a view showing a second inside air inlet 13 with a bracket 14 removed, and FIG. 2 (b) is a view showing a single bracket 14; It is.

FIG. 3 is a longitudinal sectional view of a second inside air inlet 13 of FIG. 1;

FIG. 4 shows experimental data on noise levels of the apparatus of the present embodiment and the conventional apparatus.

FIG. 5 is a diagram corresponding to FIG. 3 in a conventional device.

[Explanation of symbols]

 Reference Signs List 1 inside / outside air switching unit 4 blower motor (blowing means) 5 sirocco fan (blowing means) 7 inside / outside air switching box 8 first inside air introduction port 9 outside air introduction port 10 inside / outside air switching door (inside / outside air switching means) 13 second inside air introduction port 14 Bracket 14a Opening (second inside air inlet) 16 First rib (restriction member) 17a, 17b Second rib (restriction member) 18 Door packing (second inside air inlet opening / closing means)

Claims (6)

[Claims] An inside / outside air switching box (7) having a first inside air introduction port (8) for introducing inside air and an outside air introduction port (9) for introducing outside air is formed. )
An inside / outside air opening / closing means for opening / closing the first inside air introduction port (8) and the outside air introduction port (9) is provided, and the inside / outside air switching means (10) closes the first inside air introduction port (8). Even in the outside air introduction mode in which the outside air introduction port (9) is opened, the inside / outside air switching unit for a vehicle in which the second inside air introduction port (13, 14a) for introducing inside air into the inside / outside air switching box (7) is formed. The first inside air inlet (8) and the second inside air inlet (1);
The inside / outside air switching unit for a vehicle is characterized in that the inside / outside air switching unit for a vehicle is formed so as to open in directions opposite to each other when the unit is mounted on a vehicle. 2. The vehicle is mounted on a vehicle such that the first inside air inlet (8) faces the interior of the vehicle and the second inside air inlet (13, 14a) faces the engine room. The inside / outside air switching unit for a vehicle according to claim 1. 3. A ventilation unit (2) having ventilation means (4, 5) for sucking and discharging air from each of the inlets (8, 13, 14a) in the vehicle inside / outside air switching unit (1). The second inside air inlet (13, 14a) is connected to the second inside air inlet (13, 14a) by its own elastic force when the blowing means (4, 5) is stopped. When the air blowing means (4, 5) is closed and the air blowing means (4, 5) is operated, the negative pressure generated in the inside / outside air switching box (7) by the operation of the air blowing means (4, 5) overcomes the elastic force, so that the air pressure is reduced. 2. A second inside air inlet opening / closing means (18) for opening a second inside air inlet (13, 14a).
Or the inside / outside air switching unit for vehicles according to 2. 4. The inside / outside air switching box (7) includes a second inside air inlet opening / closing means (18) which is operated by the air blowing means (4, 5) to operate the second inside air inlet (13, 14a). When the is opened, regulating members (16, 17a, 17b) are provided which contact the second inside air inlet opening / closing means (18) to regulate the movement of the second inside air inlet opening / closing means (18). The inside / outside air switching unit for a vehicle according to claim 3, characterized in that: 5. The regulating member (16, 17a, 17b).
The inside / outside air switching unit for a vehicle according to claim 4, wherein the unit is integrally formed with the inside / outside air switching box (7). 6. The inside / outside air switching box (7) has a shape such that a dead space is created when the inside / outside air switching unit (1) is mounted on a vehicle. The inside / outside air switching unit for a vehicle according to any one of claims 1 to 5, wherein each of the first and second air passages is formed at a position directly opening into the dead space.