JP2003154836A - Vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular air conditioner that can elevate a blowing temperature emitted from a defroster outlet approximately to the same temperature as a blowing temperature emitted from a foot outlet during a foot blow mode and a foot/defroster blow mode. SOLUTION: An air passage 20 communicates with foot openings 26 and a defroster opening 21, and foot doors 27 each comprise a rotary door disposed in the air passage 20 to open and close the foot opening 26. The air passage 20 forms warm air bypass passages 30 each between a periphery portion 27a of the foot door 27 and an air conditioner case 11. In a foot blow mode and a foot/defroster blow mode, the foot doors 27 are turned to the defroster opening 21 to open the foot openings 26, and the periphery portions 27a extend the warm air bypass passages 30 to lead a part of warm air to the defroster opening 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner, and more particularly, to reducing a difference in temperature between a foot blowing mode and a foot defroster blowing mode in which air is blown to both a foot of a passenger and a window glass of a vehicle. It is intended.

[0002]

2. Description of the Related Art Conventionally, as a vehicle air conditioner of this type,
Air-conditioning air is blown into the vehicle interior by adjusting the blowout temperature with an air mix door to adjust the air flow rate of the hot air passing through the heating heat exchanger and the cold air bypassing the heating heat exchanger. A so-called air mix type temperature control system is often used.

For example, there is one disclosed in Japanese Patent Application Laid-Open No. 9-11730.
A heating heat exchanger is provided on the downstream side of the cooling air exchanger in the air conditioning unit, and cold air bypassing the heating heat exchanger and warm air passing through the heating heat exchanger are mixed above the downstream side. A mixing chamber is provided, and an air mix door is arranged between the cooling heat exchanger and the heating heat exchanger.

An inlet of an upper outlet passage communicating with a defroster opening for blowing out to the defroster outlet is provided above the downstream side of the mixing chamber, and faces the outlet of the cooling heat exchanger on the downstream side of the mixing chamber. An inlet of a lower outlet passage communicating with a foot opening for outlet to a foot outlet is provided on the side, and a passage switching door that selectively closes the inlet of the upper outlet passage and the inlet of the lower outlet passage is arranged.

A bypass passage for passing a small amount of conditioned air in the mixing chamber to the upper outlet passage when the inlet of the upper outlet passage is closed is formed near the rotary shaft of the passage switching door, and the foot passage is formed. When the hot air is blown out from the blowout port, the blowout temperature blown out from the defroster blowout port has an appropriate temperature difference without causing a large temperature difference with respect to the blowout temperature from the foot blowout port.

[0006]

However, in the above conventional apparatus, in the foot defroster blowing mode in which the passage switching door simultaneously opens the inlet of the upper outlet passage and the inlet of the lower outlet passage, the inlet of the upper outlet passage is Since it is close to the flow direction of the cold air that bypasses the heating heat exchanger, and the inlet of the lower outlet passage is close to the flow direction of the hot air that passes through the heating heat exchanger, it is especially important to rotate the air mix door. Before the cold air and the warm air are sufficiently mixed in the mixing chamber by the air volume of the cold air that bypasses the heating heat exchanger, depending on the dynamic opening, to the inlet side of the upper outlet passage,
That is, it is easy for the cool air to flow into the inlet of the lower outlet passage, that is, into the side that communicates with the foot outlet, to the side that communicates with the defroster outlet.

Therefore, the amount of cold air flowing into the defroster outlet becomes excessively large compared to the amount of cold air flowing into the foot outlet, and as a result, the defroster outlet temperature becomes too low compared to the foot outlet temperature, and the defroster capacity ( There is a problem that it causes a decrease in the window glass fog-preventing ability).

Therefore, an object of the present invention is to solve the above problems, and in the foot blowout mode and the foot defroster blowout mode, the blowout temperature blown out from the defroster blowout port is blown out from the foot blowout port. It is an object of the present invention to provide an air conditioning system for a vehicle that can raise the temperature to an isothermal level with respect to the blowing temperature.

[0009]

In order to achieve the above object, the technical means described in claims 1 and 2 are adopted. That is, in the invention described in claim 1, the air conditioning case (11) forming the air passage and the air conditioning case (1
1) A heat exchanger for heating that is installed inside and heats air (1
3) and a hot air passage (17) formed in the air conditioning case (11) and passing hot air through the heating heat exchanger (13).
A cold air bypass passage (15) which is formed in the air conditioning case (11) and bypasses the heating heat exchanger (13) and through which cool air flows, and a warm air passage (17) installed in the air conditioning case (11). ) Hot air and cold air bypass passage (15)
Formed on the side wall of the air-conditioning case (11) and the air mix door (16, 18) for adjusting the air flow rate with the cold air passing through the vehicle, and connected to the foot outlet that blows the conditioned air toward the feet of the passenger in the passenger compartment. A foot opening (26), a defroster opening (21) formed in the vicinity of the foot opening (26) and connected to a defroster air outlet for blowing conditioned air to the windshield of the vehicle, and the defroster. Defroster switching door means (22) arranged upstream of the opening (21) for opening and closing the defroster opening (21).
And a hot air passage (1) formed in the air conditioning case (11).
The air passage (20) which mixes the warm air passing through 7) with the cold air passing through the cold air bypass passage (15) and communicates with the foot opening (26) and the defroster opening (21), and this air passage (20). ), And is provided at both ends of the curved outer peripheral portion (27a) and the outer peripheral portion (27a) and slides along the opening surface of the foot opening portion (26) to slide into the foot opening portion (26). ) The end plate part (27
b) and the shaft portion (27) formed on the end plate portion (27b).
c) and foot switching door means (27) comprising a rotary door pivotally supporting the shaft portion (27c) on the air conditioning case (11), and the foot opening portion (26) switches the foot. When closed by the door means (27), the air passage (20) has a portion of the warm air passing through the warm air passage (17) between the outer peripheral portion (27a) and the air conditioning case (11). And a foot defroster in which both the defroster opening (21) and the foot opening (26) are opened while forming a hot air bypass passage (30) so that the portion is guided to the defroster opening (21). In the blowing mode, the foot switching door means (27) rotates the shaft portion (27c) toward the defroster opening portion (21) to open the foot opening portion (26) and also the outer peripheral portion (27a). But By extending the wind bypass (30), a part of the warm air passage (17) warm air which has passed through the is characterized by being configured to direct the defroster opening (21).

According to the first aspect of the present invention, the air-mixing door (16) for controlling the temperature and the foot switching door means (27) for selecting the blowing mode are provided to supply the conditioned air to the passenger compartment. In a blow-out vehicle air conditioner, a cold air bypass circuit is generally used for a defroster opening (21) opened close to the cold air side and a foot opening (26) opened close to the hot air side. The opening of (15) opens and the amount of cold air increases, so that the cold air easily flows toward the defroster opening (21) and the hot air easily flows toward the foot opening (26). Therefore, the blowout temperature on the defroster side may be too low compared to the blowout temperature on the foot side.

Therefore, in the present invention, the air conditioning case (11)
Of the foot opening (26) formed on the side wall, the defroster opening (21) formed close to the foot opening (26), and the curved outer peripheral portion (27).
a), which are provided at both ends of the outer peripheral portion (27a) and slide along the opening surface of the foot opening portion (26) to move the foot opening portion (2).
6) Foot switching door means (27) comprising a rotary door having an end plate portion (27b) for switching the open / closed state
And a hot air bypass passage (30) is formed between the outer peripheral portion (27a) and the air conditioning case (11) in the air passage (20) in which the foot switching door means (27) is arranged. At the same time, in the foot blowing mode and the foot defroster blowing mode, the foot switching door means (27) is rotated toward the defroster opening (21) to open the foot opening (26) and the outer peripheral portion ( 27
a) is configured so that the hot air bypass passage (30) is extended so that part of the hot air that has passed through the hot air passage (17) is guided to the defroster opening (21). The temperature of the air blown out from the foot can be raised close to or higher than that, and the defroster capacity can be improved. Further, the discomfort caused by the excessive decrease in the defroster blowout temperature (cool differential) during heating can be eliminated, and the heating feeling can be improved.

According to the second aspect of the invention, in the foot switching door means (27), the outer peripheral portion (27a) has a curved outer peripheral surface, and a part of the outer peripheral surface is formed into a concave shape, and the defroster opening portion (2) is formed.
In the foot defroster blowing mode, the amount of blown air from 1) is larger than that in the foot blowing mode.
It is characterized in that a large amount of warm air that has passed through 7) is guided to the defroster opening (21).

According to the second aspect of the present invention, by forming a part of the outer peripheral surface in a concave shape, the ventilation area of the warm air bypass passage (30) is expanded, so that the warm air is defrosted by the defroster opening. Many can be led to (21).

Therefore, for example, the air flow rate is 50 on the foot side.
%, The defroster side 50%, in the foot defroster blowout mode, a large amount of warm air is introduced, so that the defroster blowout air temperature can be raised close to or higher than the foot blowout air temperature, and the defroster capability is improved. Can be improved. Further, the discomfort caused by the excessive decrease in the defroster blowout temperature (cool differential) during heating can be eliminated, and the heating feeling can be improved.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
Or, it demonstrates based on FIG. The ventilation system of the vehicle air conditioner of this embodiment is roughly divided into two parts, a blower unit (not shown) and an air conditioning unit 10 shown in FIG. The blower unit is arranged offset from the central part to the passenger seat side in the lower part of the instrument panel in the passenger compartment, while the air conditioning unit 10 is arranged in the lower part of the instrument panel in the passenger compartment in the left-right direction of the vehicle. It is located in the approximate center.

As is well known, the blower unit is composed of an inside / outside air switching box for introducing and switching between inside air (air inside the vehicle) and outside air (air outside the vehicle), and a blower for sucking and blowing air through the inside / outside air switching box. ing. The air conditioning unit 10 includes an evaporator 12 which is a cooling heat exchanger and a heater core 13 which is a heating heat exchanger in one common air conditioning case 11.
Both are integrated types.

The air conditioning case 11 is made of a resin such as polypropylene, which has a certain elasticity and is excellent in strength. The air-conditioning case 11 is specifically composed of a plurality of divided cases. The plurality of divided cases accommodate the heat exchangers 12 and 13 and devices such as a door described later, and then a fastening means such as a metal spring clip and a screw. The air-conditioning unit 10 is configured by being integrally combined with each other.

The air conditioning unit 10 is arranged in a substantially central portion of the lower part of the instrument panel in the passenger compartment in the form shown in FIG. 1 in the front-rear, left-right and up-down directions of the vehicle. An air inlet 14 is formed at the frontmost part of the vehicle. The conditioned air blown from the blower unit described above flows into the air inlet 14.

An evaporator 12 is arranged in the air conditioning case 11 immediately after the air inlet 14. This evaporator 1
2 is a thin type in the vehicle front-rear direction and is vertically arranged so as to cross the passage in the air-conditioning case 11. Therefore, the blown air from the air inlet 14 flows into the front surface of the evaporator 12 extending in the vehicle vertical direction. As is well known, the evaporator 12 absorbs latent heat of vaporization of the refrigerant in the refrigeration cycle from the conditioned air to cool the conditioned air.

A heater core 13 is arranged downstream of the evaporator 12 on the air flow side (on the rear side of the vehicle) at a predetermined interval. The heater core 13 is arranged on the lower side in the air conditioning case 11 so as to be inclined toward the vehicle rear side. The heater core 13 reheats the cold air that has passed through the evaporator 12, hot hot water (engine cooling water) flows therein, and heats air using the hot water as a heat source.

In the air passage in the air-conditioning case 11, a cool air bypass passage 15 in which cool air flows by bypassing the heater core 13 and a warm air passage in which warm air flows through the heater core 13 above the heater core 13. And 17 are formed.

In each of the cold air bypass passage 15 and the warm air passage 17, a flat plate for adjusting the mixing ratio of the hot air heated by the heater core 13 and the cold air bypassing the heater core 13 through the cold air bypass passage 15 is adjusted. Shaped air mix doors 16 and 18 are arranged.

Here, the air mix doors 16 and 18
Is integrally connected to the rotating shafts 16c and 18c arranged in the horizontal direction, and is rotatable with the rotating shafts 16c and 18c in the vehicle vertical direction. The air mix doors 16 and 18 serve as temperature adjusting means for adjusting the temperature of the air blown into the vehicle compartment by adjusting the mixing ratio. Rotation axis 1
6c and 18c are rotatably supported by the air conditioning case 11, and one end of the rotation shafts 16c and 18c is the air conditioning case 1.
1 is connected to a link mechanism (not shown) so as to be rotated and driven by a temperature control mechanism (actuator such as servomotor) of the air conditioner.

In the air conditioning case 11, on the air downstream side of the heater core 13 (portion on the vehicle rear side), a wall surface 19 extending in the up-down direction at a predetermined interval from the heater core 13 is integrated with the air conditioning case 11. It is molded. With this wall surface 19, the hot air passage 1 is provided immediately after the heater core 13.
The hot air is guided upward through the circulation of 7.

In the air conditioning case 11, an air passage 20 for mixing cold air and warm air is formed on the air downstream side (upper side) of the cold air bypass passage 15 and the hot air passage 17.

A defroster opening 21 is formed at a portion on the vehicle front side above the air conditioning case 11 at the downstream end of the air passage 20 and opens upward in the vehicle front direction. The defroster opening 21 is for the temperature-controlled air to flow in from the air passage 20 and is connected to the defroster outlet via a defroster duct (not shown). From this defroster outlet, the inner surface of the vehicle front window glass Blow out conditioned air toward.

The defroster opening 21 is opened and closed by a defroster door 22 which is a flat butterfly type defroster switching door means. This defroster door 22
Is installed on the upstream side of the defroster opening 21 and is rotatably supported by a rotary shaft 22c horizontally arranged adjacent to the upper end of the defroster opening 21 near the upper surface of the air conditioning case 11. .

Next, a face opening 23 slightly projecting to the rear side of the vehicle is formed at a portion on the vehicle rear side (closer to the occupant) than the defroster opening 21. The temperature of the face opening 23 is controlled. Conditioned air is the air passage 20
Flowed in through.

The face opening 23 is connected via a face duct (not shown) to a face outlet located above the center of the instrument panel in the left-right direction. Blows conditioned air toward the head.

The face opening 23 is opened and closed by a flat face door 24. This face door 2
4 is installed on the upstream side of the face opening 24, and is rotatably supported by a rotary shaft 24c arranged in the horizontal direction.

Next, the foot opening 2 which is an essential part of the present invention
6 and foot switching door means for opening and closing the foot opening 26 will be described with reference to FIGS. 1 and 2.
First, as shown in FIG. 2, at both ends of the side wall of the air conditioning case 11 near the defroster opening 21, the foot opening 2 is formed.
6 is formed. Air-conditioning air whose temperature is controlled flows into the foot opening 26 from the air passage 20.

Foot passages are provided on the left and right sides (not shown) on the air downstream side of the foot openings 26, and a front seat foot passage opens in the middle of the foot passage. The conditioned air from the front seat foot passage is blown out to the left and right occupant's feet of the front seat through a front seat foot duct and a front seat foot outlet (not shown). Further, a rear seat foot duct and a rear seat foot outlet, which are not shown, are connected to the end portion of the foot passage, and the conditioned air is discharged to the feet of the left and right occupants of the rear seat through the rear seat foot outlet. .

The opening and closing of the foot opening 26 is
It is opened and closed by a foot door 27 which is a foot switching door means which is a rotary door. This foot door 27 is
A curved outer peripheral portion 27a is disposed at both left and right ends of the air passage 20, end plate portions 27b provided at both ends of the outer peripheral portion 27a, and the end plate portion 27 are formed. It is a drum-shaped rotary door having a shaft portion 27c and having a substantially fan-shaped cross section.

27d is a left and right foot door 27.
Is a connecting member for connecting to the air conditioning case 11 and is rotatably supported by the air conditioning case 11 by the shaft portion 27c. Furthermore, one end of the shaft portion 27c projects outside the air conditioning case 11,
It is connected to a link mechanism (not shown) and is rotatably driven by a temperature control mechanism (actuator such as servo motor) of the air conditioner.

Further, the shaft portion 27c is disposed on the front side of the vehicle with respect to the foot opening portion 26, and the foot door 27 rotates the shaft portion 27c toward the defroster opening portion 21 so that the foot opening portion 26c. Are arranged so as to open from fully closed to fully open.

Further, a part of the outer peripheral surface of the curved outer peripheral portion 27a is formed in a concave shape to enlarge a ventilation area of a warm air bypass passage described later. Further, the end plate portion 27b is a surface for sliding along the opening surface of the foot opening portion 26 to switch the open / closed state of the foot opening portion 26, and when the foot opening portion 26 is fully closed, the end plate portion 27b. The seal member 27e provided on the outer peripheral edge of the portion 27b (see FIG.
See) is more airtight.

Further, in the foot door 27, when the foot opening 26 is closed, a part of the warm air passing through the warm air passage 17 between the foot door 27 and the wall surface 19 of the air conditioning case 11 is opened along the wall surface 19 in the defroster opening. A warm air bypass passage 30 is formed so as to lead to the portion 21.

The warm air bypass passage 30 opens the foot opening 26 when the foot door 27 is rotated toward the defroster opening 21, and the curved shape of the outer peripheral portion 27a of the foot door 27 described above. And the concave shape of a part thereof, the hot air bypass passage 30
Is extended and, as will be described later, the ventilation area of the warm air bypass passage 30 is expanded in the foot defroster blowing mode when the air volume ratio of the defroster blowing air volume to the foot blowing air volume is 50:50. . (See FIG. 3) The defroster door 22, the face door 24, and the foot door 27 are control door means for switching the blowing mode, and one ends of the rotating shafts 22c, 24c, 27c project outside the air conditioning case 11. Then, it is connected to a link mechanism (not shown) and is interlocked with a blowout mode switching mechanism (actuator such as a servomotor).

Further, the air mix doors 16, 18 defroster doors 22 and face doors 24 are provided with respective rotating shafts 16.
It has a door substrate made of resin or metal that is integrally combined with c, 18c, 22c, and 24c, and has an elastic sealing material such as urethane foam attached to both front and back surfaces of this substrate.

Next, the operation of this embodiment having the above configuration will be described. As is well known, a vehicle air conditioner includes an electronic control device (not shown) to which operation signals from various operation members provided on an air conditioning operation panel and sensor signals from various sensors for air conditioning control are input. Each control door 16, 18, 22, 24, 2 is output by the output signal of this control device.
The rotation position of 7 is controlled.

The adjustment of the temperature of the air blown into the passenger compartment is
The air mix doors 16 and 18 adjust the air volume ratio between the cool air cooled by the evaporator 12 and flowing directly to the cold air bypass passage 15 side and the warm air heated by the heater core 13. Then, the cold air and the warm air are mixed in the air passage 20 and then blown out to a predetermined portion in the vehicle compartment according to the blowout mode.

FIG. 1 shows the state of the foot blowing mode, in which the face opening 23 is closed by the face door 23 and the face door 27 and the defroster door 22 are in the positions shown in FIG. Each opening 2
Nos. 1 and 26 are set so as to be blown out from the defroster outlet at 20% and from the foot outlet at an air volume ratio of 80%, for example.

In the temperature adjusting region, the air mix doors 16 and 18 open the cool air bypass passage 15 and the warm air passage 17 by an appropriate amount, and pass the cool air flowing from the evaporator 12 to the cool air bypass passage 15 and the heater core 13. The warm air is mixed in the air passage 20, and the conditioned air adjusted to the desired temperature in this way is blown out toward the front window glass through the defroster opening 21 and also to the foot side of the occupant through the foot opening 26. Blown out.

However, in this embodiment, the foot door 2
By the hot air bypass passage 20 being extended by the outer peripheral portion 27a of 7, and a part of the hot air that has passed through the hot air passage 17 between the wall surface 19 and the wall surface 19 is guided to the defroster opening portion 21 along the wall surface 19, The temperature of the air blown toward the front window glass is increased.

Further, when it is desired to increase the amount of air blown from the defroster blowout port as compared with the above-mentioned foot blowout mode, the blowout mode is switched to the foot defroster blowout mode as shown in FIG. Here, for example, it is set so as to be blown out from the defroster air outlet at 50% and from the foot air outlet at an air volume ratio of 50%, and the defroster door 22 and the foot door 27 are rotated to the positions shown in the figure.

That is, the defroster door 22 is opened more than in the foot blowing mode, and the foot door 27 is rotated so as to close the opening of the foot opening 26 a little more than in the foot blowing mode.

Further, in the temperature adjusting region at this time, as in the above, the air mix doors 16 and 18 are mixed with the cool air and the hot air in the air passage 20, and the conditioned air adjusted to a desired temperature has a defroster opening portion. It is blown out toward the front windshield through 21 and is blown toward the foot side of the occupant through the foot opening 26.

However, in this embodiment, the foot door 2
Due to the concave shape of the outer peripheral portion 27a of the hot air bypass passage 2
The ventilation area of 0 is expanded, and a part of the warm air that has passed through the warm air passage 17 between the wall surface 19 and the wall surface 19 is guided to the defroster opening 21 along the wall surface 19 toward the front window glass. The temperature of the air blown out is increased.

Further, the defroster capacity and the heating feeling can be improved by avoiding the phenomenon that the defroster blown air temperature becomes extremely lower than the foot blown air temperature.

In this embodiment, the hot air bypass passage 20 and the outer peripheral portion 27a of the foot door 27 are closed even in the defroster blowing mode in which the foot blowing mode is closed and 100% of the air volume is blown from the defroster outlet.
Due to the concave shape of the defroster opening 2 along the wall surface 19, part of the warm air that has passed through the hot air passage 17 between the wall surface 19 and
As a result, the temperature of the blown air blown out toward the front window glass is raised by being led to a large amount.

In the face blowing mode in which the defroster opening 21 and the foot opening 26 are closed and the face opening 23 is opened, the warm air bypass passage 20 is provided.
A part of the warm air is guided to the upper part of the defroster door 22, but a part of the hot air is mixed in the air passage 20, and a cool air flows between the face opening 23 and the face outlet. Do not be afraid to be mixed and impair comfort.

According to the vehicle air conditioner of the above embodiment, the foot opening 26 formed in the side wall of the air conditioning case 11 and the defroster opening 21 formed close to the foot opening 26 are provided. A rotary having an outer peripheral portion 27a formed in a curved shape and an end plate portion 27b provided at both ends of the outer peripheral portion 27a and sliding along the opening surface of the foot opening portion 26 to switch the open / closed state of the foot opening portion 26. The air passage 20 in which the foot door 27 is formed is provided with a warm air bypass passage 30 between the outer peripheral portion 27a and the air conditioning case 11, and the foot blowing mode and the foot defroster are provided. In the blowout mode, the foot door 27 is rotated toward the defroster opening 21 to allow the foot opening 2 to move.
6 is opened, and the outer peripheral portion 27a has the warm air bypass passage 3
0 is extended so that part of the warm air that has passed through the warm air passage 17 is guided to the defroster opening portion 21, so that the defroster blown air temperature rises close to or above the foot blown air temperature. The defroster ability can be improved.

Further, the discomfort caused by the excessive decrease in the defroster blow-out temperature (cool differential) during heating can be eliminated, and the heating feeling can be improved.

Further, in the foot defroster blowout mode in which the amount of air blown out from the defroster blowout port is larger than in the foot blowout mode, by forming a part of the outer peripheral surface of the outer peripheral portion 27a in a concave shape, the hot air bypass passage is formed. By increasing the ventilation area of 30, a large amount of warm air can be guided to the defroster opening 21.

Therefore, since a large amount of warm air is introduced,
The defroster blown air temperature can be raised close to or higher than the foot blown air temperature, and the defroster capacity can be improved.

(Other Embodiments) In the above embodiment,
We explained that the operation of each control door is driven by an actuator such as a servo motor via a link mechanism, but the manual operation force applied to the manual operation members such as the temperature control lever and the blowout mode switching lever provided on the air conditioning operation panel. The control doors may be operated via an operation cable or the like.

Further, in the above embodiment, each control door 1
6, 18, 22, and 24 have the same structure in the state of a single body, and each of the rotating shafts 16c, 18c, 22c, and 24c.
It was explained that the structure has a door substrate made of resin or metal that is integrally combined with, and the elastic sealing material such as urethane foam is adhered to both front and back surfaces of the substrate, but not limited to this, the elastic seal A door substrate having a structure in which no material is attached may be used.

Further, although the blower mode switching means is driven by the user using the control lever to manually operate the blowout mode switching means, the air conditioner equipped with an automatic air conditioner that automatically controls the blowout mode switching means is used. Is also applicable.

Further, it is needless to say that the present invention can be similarly applied to an air conditioner of a type in which the evaporator (heat exchanger for cooling) 12 is not provided in the air conditioner unit 10 and a reheat type vehicle air conditioner.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an overall configuration of an air conditioning unit 10 of an air conditioning system for a vehicle according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an AA cross section of the air conditioning unit 10 shown in FIG.

FIG. 3 is a longitudinal sectional view showing an operating state (foot defroster blowing mode) in another blowing mode of FIG.

[Explanation of symbols]

11 ... Air conditioning case 13 ... Heater core (heat exchanger for heating) 15 ... Cold air bypass passage 17 ... Warm air passage 16, 18 ... Air mix door 20 ... Air passage 21 ... Defroster opening 22 ... Defroster door (defroster switching door means) 26 ... Foot opening 27 ... Foot door (foot switching door means) 27a ... Outer peripheral portion 27b ... End plate 27c ... Shaft 30 ... Hot air bypass passage

Claims (2)

[Claims] 1. An air-conditioning case (11) forming an air passage.
A heating heat exchanger (13) installed in the air conditioning case (11) for heating air, and formed in the air conditioning case (11) and passing through the heating heat exchanger (13). Hot air passage (17)
A cold air bypass passage (15) formed in the air conditioning case (11), bypassing the heating heat exchanger (13) and allowing cold air to flow, and being installed in the air conditioning case (11), Hot air passing through the air passage (17) and the cold air bypass passage (1
5) An air mix door (16, 18) for adjusting the air flow rate ratio to the cool air passing through, and a foot outlet formed on the side wall of the air conditioning case (11) for blowing out the conditioned air toward the feet of the passenger in the passenger compartment. And a defroster opening (21) formed in the vicinity of the foot opening (26) and connected to a defroster outlet that blows conditioned air to the windshield of the vehicle. A defroster switching door means (22) arranged on the upstream side of the defroster opening (21) for opening and closing the defroster opening (21); and a hot air passage (22) formed in the air conditioning case (11). 17) hot air and the cold air bypass passage (1)
5) is mixed with cold air passing through, and the foot opening (2
6) and an air passageway (20) communicating with the defroster opening (21), and a curved outer peripheral portion (27a) arranged in the air passageway (20) and both ends of the outer peripheral portion (27a). Formed on the end plate portion (27b) that is provided at the end plate portion (27b) that slides along the opening surface of the foot opening portion (26) to switch the open / closed state of the foot opening portion (26). Shaft part (27c),
A foot switching door means (27) comprising a rotary door rotatably rotatably supported on the air conditioning case (11), the foot opening (26) being closed by the foot switching door means (27). When the air passage (20) is present, the hot air passage (17) is provided between the outer peripheral portion (27a) and the air conditioning case (11).
Part of the warm air that has passed through the defroster opening (21)
A hot air bypass passage (30) is formed so as to be guided to the defroster opening (21) and the foot opening (2).
6) In the foot blowout mode and the foot defroster blowout mode in which both of them are opened, the foot switching door means (27) rotates the shaft portion (27c) toward the defroster opening portion (21). To open the foot opening (26), and the outer peripheral portion (27a) extends the warm air bypass passage (30) so that part of the warm air that has passed through the warm air passage (17) is An air conditioner for a vehicle, which is configured to be guided to the defroster opening (21). 2. The foot switching door means (27) is configured such that a part of a curved outer peripheral surface of the outer peripheral portion (27a) is formed in a concave shape so that the amount of air blown out from the defroster opening (21) is increased. In the foot defroster blowing mode, which is more than in the foot blowing mode, a large amount of warm air that has passed through the warm air passage (17) is guided to the defroster opening (21). The vehicle air conditioner according to Item 1.