JP2003252034A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease the thickness, in the longitudinal direction of a vehicle, of an air conditioning case while suppressing the increase of the size of the lower part of the air conditioning case. <P>SOLUTION: After a ratio between an airflow of cold air through a upper cold air passage 15 and that of hot air through an upper hot air passage 20 is regulated by an upper air mix door 18, the regulated airflow is discharged through a face discharge port 24 and by discharging the regulated airflow through a foot discharge port 30 after a ratio between an air flow of cold air through a lower cold air passage 16 and that of hot air through a lower air mix door 19 is regulated, and by providing two air mix doors 18 and 19, the thickness in the longitudinal direction of a vehicle is decreased and further since cold air through the lower cold air passage 16 is guided toward a lower air mix chamber 23 by a foot door 31, guided cold air is collided with hot air and mixing ability can be improved. Thus, a lower air mix chamber 23 can be decreased in size and in turn, the increase in size of the lower part of the air conditioning case 11 can be suppressed. <P>COPYRIGHT: (C)2003,JPO

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 having an air conditioning case equipped with a cooling heat exchanger and a heating heat exchanger.

[0002]

2. Description of the Related Art FIG. 6 shows a vehicle air conditioner disclosed in Japanese Unexamined Patent Publication No. 10-250345. An air conditioner case 11 has an evaporator 12 and a heater core 13.
In this air conditioner, the length of each air mix door 180, 190 is shortened by using two doors. According to this, the rotational range of the air mix doors 180 and 190 in the vehicle front-rear direction can be reduced while ensuring the cross-sectional area of the ventilation path to the heater core 13, so that the amount of air flow to the heater core 13 in the vehicle front-rear direction can be reduced. The width of the air conditioning case 11 can be reduced.

Above the heater core 13 in the air-conditioning case 11, the air that mixes the cool air that has passed through the evaporator 12 and bypassed the heater core 13 with the warm air that has passed through the heater core and that has been introduced into the warm air passage 210. A mixing unit 22 is provided. A foot passage 211 that guides the conditioned air of the air mixing portion 22 to the foot opening portion 300 located below is formed in a portion of the air conditioning case 11 on the vehicle rear side of the warm air passage 210.

[0004]

However, in the air conditioner of the above publication, the air mixing section 22 is located above the heater core 13.
Since the hot air that has passed through the heater core 13 is once raised to the air mixing portion 22 above the heater core 13 since it is provided only in a portion, the foot opening 30 located below is provided.
You have to lead to 0. Therefore, on the vehicle rear side of the heater core 13, the two passages 210 and 211 must be provided so as to overlap with each other in the vehicle front-rear direction, which hinders the thinning of the air conditioning case 11 in the vehicle front-rear direction.

Here, it is conceivable to provide a mixing section below the heater core 13 and eliminate the foot passage 211 to further reduce the width, but simply add the mixing section below the heater core 13. Only by doing so, the lower part of the air conditioning case 11 becomes large in size in order to secure the space of this mixing part.

In view of the above points, the present invention has an object to reduce the width of the air conditioning case in the vehicle front-rear direction while suppressing an increase in the size of the lower portion of the air conditioning case.

[0007]

In order to achieve the above-mentioned object, in the invention described in claim 1, the face outlet (24) for blowing the conditioned air toward the upper half of the occupant and the conditioned air toward the feet of the occupant. Air conditioning case (11) having a foot outlet (30) for blowing air, and an air conditioning case (11)
A heat exchanger (12) for cooling which is arranged substantially vertically inside to cool the air, and a heat exchanger (12) arranged inside the air conditioning case (11) on the downstream side of the air flow of the heat exchanger for cooling (12) to heat the air. The heat exchanger (13) for heating and the cooling air that is formed in the air conditioning case (11) and has passed through the heat exchanger (12) for cooling bypasses the heat exchanger (13) for heating and the face outlet ( 24), which is formed in the first cold air passage (15) and the air conditioning case (11), and cools the cold air into the heat exchanger (13) for heating.
The second cool air passage (16) that bypasses the air to the foot outlet (30) and the warm air that has been formed in the air conditioning case (11) and has passed through the heating heat exchanger (13), and the face outlet (24). ) Is formed in the air conditioning case (11) and the first hot air passages (17a, 20) leading to the hot air outlet (3).
0) and the second warm air passages (17b, 21) and the cold air that is formed in the air conditioning case (11) and flows through the first cold air passage (15) and the first warm air passages (17a, 20). A first mixing portion (22) for mixing with warm air to be circulated, and a cold air and a second warm air passage (17b, 21) which are formed in the air conditioning case (11) and circulate in the second cold air passage (16). A second mixing part (23) for mixing with warm air to be mixed, a first air mix member (18) for opening and closing the first cold air passage (15) and the first warm air passage (17a, 20), and a second Cold wind passage (1
6) and the second warm air passage (17b, 21) second opening and closing
An air mix member (19) and a foot opening / closing member (31) arranged in the air conditioning case (11) for opening / closing the foot outlet (30) are provided, and the foot opening / closing member (31) allows the second cold air passage ( It is characterized in that the cold air flowing through 16) is guided toward the second mixing section (23).

According to this, since the two air mix members (18, 19) are provided, the heat exchanger (13) for heating is provided.
To the air conditioning case in the front-back direction of the vehicle (1
It is possible to reduce the thickness of 1).

Further, since the two mixing parts (22, 23) are provided, the hot air passing through the heating heat exchanger (13) is first
It is possible to blow out from the foot outlet (30) through the second mixing section (23) without ascending to the mixing section (22). Therefore, the conventional foot passage 2 shown in FIG.
11 can be eliminated, and the air conditioning case (1
It is possible to further reduce the thickness of 1).

Further, according to the present invention, since the cold air flowing through the second cold air passage (16) is guided toward the second mixing portion (23) by the foot opening / closing member (31), the second cold air passage (16). ) The cold air of the second hot air passage (17b, 21)
The hot air can be collided with the hot air, and the mixing property of the cold air and the hot air can be improved. Therefore, it is possible to reduce the size of the second mixing section (23) while maintaining the above-mentioned mixing property, and it is possible to suppress the increase in size of the lower portion of the air conditioning case (11).

As described above, according to the present invention, it is possible to reduce the width of the air conditioning case (11) in the vehicle front-rear direction while suppressing an increase in the size of the lower portion of the air conditioning case (11).

In the present invention, since the two air mix members (18, 19) are provided, the face outlet (2
It is possible to independently control the temperature of the conditioned air blown from 4) and the temperature of the conditioned air blown from the foot outlet (30), and to provide the occupant with detailed air conditioning control.

When the foot outlet (30) is arranged below the heating heat exchanger (13) as in the second aspect of the invention, the foot outlet (30) is heated. It is possible to further reduce the width of the air conditioning case (11) in the vehicle front-rear direction, as compared with the case where the vehicle rear side (13) is arranged.

The reference numerals in parentheses of the above means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 show a part of the air conditioning unit 10 according to the present embodiment, and the ventilation system of the vehicle air conditioner according to the present embodiment is roughly divided into two parts, a blower unit (not shown) and an air conditioning unit 10. It is divided into

The blower unit is arranged offset from the center of the lower part of the instrument panel in the passenger compartment to the passenger seat side, while the air conditioning unit 10 is arranged in the lower part of the instrument panel in the passenger compartment of the vehicle. It is arranged at a substantially central portion in the left-right direction. The arrows in FIG. 1 indicate the front-rear direction and the vertical direction of the vehicle when the air conditioning unit 10 is mounted on the vehicle.

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 is of a type in which both an evaporator (cooling heat exchanger) 12 and a heater core (heating heat exchanger) 13 are integrally incorporated in one common air-conditioning case 11. is there. The air-conditioning case 11 is made of a resin such as polypropylene having a certain degree of elasticity and being excellent in strength.

An air inlet 14 is formed on the side surface of the air-conditioning case 11 that is closest to the front of the vehicle (side surface on the passenger seat side). The conditioned air blown from the blower unit described above flows into the air inlet 14.

The evaporator 12 is arranged substantially vertically in the air conditioning case 11 immediately after the air inlet 14. That is, the evaporator 12 has a thin shape in the vehicle front-rear direction, and is vertically arranged so as to traverse 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 the latent heat of vaporization of the refrigerant of the refrigeration cycle from the air to cool the air.

A heater core 13 is laminated on the downstream side of the evaporator 12 in the air flow direction (rear side of the vehicle) with a predetermined gap. As shown in FIG. 1, the vertical dimension of the heater core 13 is shorter than the vertical dimension of the evaporator 12. Although not shown, the width dimension of the evaporator 12 and the heater core 13 in the vehicle left-right direction is designed to be substantially the same as the width dimension of the air conditioning case 11.

The heater core 13 reheats the cold air that has passed through the evaporator 12. Hot water of high temperature (engine cooling water) flows inside the heater core 13, and the hot water is used as a heat source to heat the air to heat air. It is a vessel.

In the air passage in the air-conditioning case 11, an upper cool air passage 15 is formed above the heater core 13 so that cool air that bypasses the heater core 13 flows.
Cold air flows as shown by arrow C1. On the other hand, in the lower part of the heater core 13, a lower cool air passage 16 through which the cool air bypassing the heater core 13 flows is formed, and the cool air flows as shown by an arrow C2.

Incidentally, the upper cold air passage 15 corresponds to the first cold air passage described in the above claims, and the lower cold air passage 16 corresponds to the second cold air passage described in the above claims. Is.

A partition plate 17 is provided between the heater core 13 and the evaporator 12 so as to face the core surface of the heater core 13. The partition plate 17 has an upper portion and a lower portion. An upper opening 17a and a lower opening 17b are opened in each side.

Further, above the heater core 13, there is provided a rotary shaft 18a extending in the vehicle left-right direction and rotatably attached to the air conditioning case 11. The upper air mix door 18 is integrally resin-molded on the rotary shaft 18a. The upper air mix door 18 is a butterfly door, and the upper cold air passage 15 and the upper opening 17a are opened and closed by the door surface on the vehicle front side with respect to the rotating shaft 18a. An upper warm air passage 20, which will be described later, is opened and closed by a door surface on the vehicle rear side with respect to the rotating shaft 18a.

When the upper air mix door 18 is rotated to open the upper opening 17a and close the upper cool air passage 15, the upper warm air passage 20 is opened and the upper opening 1 is opened.
When 7a is closed and the upper cool air passage 15 is opened, the upper warm air passage 20 is closed.

A rotary shaft 19a extending in the vehicle left-right direction and rotatably attached to the air conditioning case 11 is provided between the heater core 13 and the evaporator 12. The lower air mix door 19 is integrally resin-molded on the rotary shaft 19a. The lower cool air passage 16 and the lower opening 17b are opened and closed by the rotation of the lower air mix door 19.

Incidentally, the upper air mix door 18 corresponds to the first air mix door described in the above claims, and the lower air mix door 19 the second air mix door described in the above claims. Is equivalent to.

In the air passage in the air-conditioning case 11, an upper warm air passage 20 for guiding the hot air passing through the heater core 13 upward is formed in a portion of the heater core 13 downstream of the air flow (in the rear of the vehicle). As shown by H1, warm air flows along the vehicle rear side wall surface 11a of the air conditioning case 11.

In the air passage in the air-conditioning case 11, a lower warm air passage 21 for guiding the warm air passing through the heater core 13 downward is formed at a portion of the heater core 13 downstream of the air flow (in the rear of the vehicle). As shown by H2, warm air flows along the vehicle rear side wall surface 11a of the air conditioning case 11.
The hot air passages 20 and 21 communicate with each other immediately after passing through the heater core 13.

Incidentally, the passage from the upper opening 17a to the upper warm air passage 20 corresponds to the first warm air passage described in the above claims, and from the lower opening 17b to the lower warm air passage 21. The passage corresponds to the second warm air passage described in the claims.

The rotary shaft 18 in the air conditioning case 11
As shown by the dotted line in the figure, an upper air mix chamber 22 that mixes the cool air flowing through the upper cool air passage 15 and the hot air flowing through the upper warm air passage 20 is formed above a. In addition, the rotary shaft 18a in the air conditioning case 11
As shown by the dotted line in the figure, below the lower cold air passage 1
A lower air mix chamber 23 for mixing the cool air flowing through 6 and the hot air flowing through the lower hot air passage 21 is formed.

Therefore, by rotating the upper air mix door 18, the air volume ratio between the cold air C1 and the warm air H1 is adjusted, and the temperature of the conditioned air is adjusted in the upper air mix chamber 22. Similarly, by rotating the lower air mix door 19, the air volume ratio between the cold air C2 and the warm air H2 is adjusted, and the temperature of the conditioned air is adjusted in the lower air mix chamber 23.

Incidentally, the upper air mix chamber 22
Corresponds to the first mixing unit described in the claims,
The lower air mix chamber 23 corresponds to the second mixing section described in the claims.

One end of each of the rotary shafts 18a and 19a projects outside the air conditioning case 11 and is connected to an actuator mechanism using a servomotor or a manual operation mechanism via a link mechanism (not shown). Or air mix doors 18 and 1 by manual operation mechanism
The rotation position of 9 is adjusted.

A face outlet 24 for blowing the conditioned air of the upper air mix chamber 22 toward the upper half of the occupant is formed on the upper surface of the air conditioning case 11. A rotary shaft 25a extending in the vehicle left-right direction and rotatably attached to the air conditioning case 11 is provided on the upper surface of the air conditioning case 11. The face door 25 is integrally resin-molded on the rotary shaft 25a. The face outlet 25 is opened and closed by the rotation of the face door 25.

A defroster outlet 26 for blowing out the conditioned air of the upper air mix chamber 22 toward a vehicle front window glass (not shown) is formed on the upper surface of the air conditioning case 11 on the vehicle front side of the face outlet 24. . Also,
On the vehicle front side of the face outlet 24 of the upper surface of the air conditioning case 11, a rotating shaft 27a extending in the vehicle left-right direction and rotatably attached to the air conditioning case 11 is provided. The defroster door 27 is attached to the rotary shaft 27a.
Are integrally molded with resin. Then, by rotating the defroster door 27, the defroster outlet 26 is opened and closed.

The face outlet 24 and the defroster outlet 26 are provided with a face duct 28 and a defroster duct 29 for guiding the conditioned air to a face outlet grill and a defroster outlet grill (not shown) provided on the instrument panel.
Are connected to each.

On the lower surface of the air conditioning case 11, there is formed a foot outlet 30 for blowing the conditioned air of the lower air mix chamber 23 toward the feet of the occupant. Also,
On the lower surface of the air conditioning case 11, a rotary shaft 31a extending in the vehicle left-right direction and rotatably attached to the air conditioning case 11.
Is provided. The foot door 31 is integrally resin-molded on the rotary shaft 31a. The face outlet 24 is opened and closed by the rotation of the foot door 31.

The rotary shaft 31a of this embodiment is arranged on the vehicle front side of the foot outlet 30, and the foot door 31 is arranged so as to extend from the rotary shaft 31a toward the downstream side of the air flow. . The foot outlet 30 of the present embodiment is arranged directly below the heater core 13.

Incidentally, the foot door 31 corresponds to the foot opening / closing member described in the claims.

When the foot door 31 is rotated to the position shown in FIG. 1 to open the foot outlet 30, the cold air C2 flows into the lower air mix chamber 23 while being guided toward the foot door 31. Then, the conditioned air in the lower air mix chamber 23 flows downward as shown by an arrow CH2 and is blown out from the foot outlet 30.

One end of each of the rotating shafts 25a, 27a, 31a projects outside the air conditioning case 11 and is connected to an actuator mechanism using a servomotor or a manual operation mechanism via a link mechanism (not shown). The face door 25, the defroster door 27, and the foot door 31 are interlocked by an actuator mechanism or a manual operation mechanism and rotated to a predetermined position to switch various blowout modes described later.

Next, the operation of the present embodiment having the above-mentioned structure will be described. In the vehicle air conditioner of the present embodiment, the operation positions of the face door 25, the defroster door 27 and the foot door 31 which are the door means for switching the blowing mode are set. The following blowing modes can be set by selecting.

(1) Face blowout mode FIG. 2 is a cross-sectional view showing the face mode of the air conditioner of this embodiment, in which the face blowout port 24 is opened, the defroster blowout port 26 is closed, and the foot blowout port 30 is closed. At this time, when the air mix doors 18 and 19 are operated to the positions indicated by the solid lines in FIG. 2, the upper and lower openings 17a and 17b are fully closed, and the upper cooling air passage 15 is fully opened to set the maximum cooling state. The upper warm air passage 20 is closed by the upper air mix door 18 which is a butterfly door.

In this state, when a blower unit and a refrigerating cycle (not shown) are operated, the blown air from the blower unit flows in through the air inlet 14 and is cooled in the evaporator 12 to become cool air. In the maximum cooling state, the cold air passes through the upper cool air passage 15 as it is, goes toward the face outlet 24 through the upper air mix chamber 22, and is blown toward the upper body of the occupant.

Here, by closing the upper warm air passage 20 by the butterfly door 18, warm air near the downstream side of the heater core 13 is mixed into the upper air mix chamber 22 through the upper warm air passage 20 by natural convection. This prevents the cold air temperature from rising.

When the upper air mix door 18 is operated from the solid line position (maximum cooling position) in FIG. 2 to the alternate long and short dash line position (intermediate opening position) in FIG. 2 to control the temperature of the air blown into the passenger compartment, the upper side is opened. According to the opening position of the air mix door 18, most of the cool air passes through the upper cool air passage 15, and the remaining part of the cool air flows into the heater core 13 and is heated to become warm air. This warm air rises in the upper warm air passage 20 and reaches the upper air mix chamber 22, where it merges with the cool air and is mixed. The conditioned air CH1 adjusted to a desired temperature by mixing the cold air C1 and the warm air H1 is blown toward the upper half of the occupant on the front seat side through the above route.

(2) Foot blow mode FIG. 3 is a cross-sectional view showing the foot mode of the air conditioner of this embodiment. The defroster door 27 is opened from the solid line position in FIG. The outlet 24 is closed. Further, the foot door 31 is operated to the position shown by the solid line in FIG. 3 to fully open the foot outlet 30.

At this time, when the upper and lower air mix doors 18 and 19 are operated to the positions shown by the solid lines in FIG. 3, the upper and lower cool air passages 15 and 16 are fully closed, and the upper and lower openings 17a and 17b are opened. The maximum heating state is set in which the ventilation passage to the heater core 13 is fully opened.

Therefore, the blown air from the blower unit passes through the evaporator 12, and then the whole amount thereof flows into the heater core 13 to be heated and becomes warm air. This warm air is on the lower hot air passage 2
1 down to the lower air mix chamber 23, from which hot air is blown through the foot outlet 30 to the foot side of the front seat occupant. The operation of the refrigeration cycle is stopped, and the air that has passed through the evaporator 12 is not cooled.

Part of the warm air that has passed through the heater core 13 rises in the upper warm air passage 20 and is blown toward the window glass of the vehicle front through the defroster outlet 26 which is open a small amount. The blowing of warm air can prevent fogging of the window glass of the vehicle.

When the lower air mix door 19 is operated from the solid line position (maximum heating position) in FIG. 3 to the chain line position (intermediate opening position) in FIG. 3 to control the temperature of the air blown into the passenger compartment, According to the opening position of the lower air mix door 19, most of the air that has passed through the evaporator 12 is the lower opening 1.
The hot air flows from 7b through the heater core 13 and flows into the lower air mix chamber 23 through the lower hot air passage 21. Most of the warm air that has passed through the heater core 13 from the upper opening 17 a also flows into the lower air mix chamber 23 through the lower warm air passage 21.

On the other hand, a part of the remaining air that has passed through the evaporator 12 bypasses the heater core 13 and flows into the lower air mix chamber 23 through the lower cool air passage 16 while being guided toward the foot door 31. By thus guiding, the air flowing into the lower air mix chamber 23 through the lower cool air passage 16 collides with the warm air flowing into the lower air mix chamber 23 through the lower warm air passage 21. . Then, the air-conditioning air CH2 that has collided and mixed as described above and is adjusted to the desired temperature is blown from the foot outlet 30 to the foot side of the front seat occupant.

(3) Bi-level outlet mode FIG. 1 is a sectional view showing the bi-level mode of the air conditioner of this embodiment, in which the face outlet 24 is opened, the defroster outlet 26 is closed, and the foot outlet 30 is opened. open.

According to the opening degree of the upper air mix door 18, the cold air C1 in the upper air mix chamber 22
The mixing ratio of the hot air H1 and the hot air H1 is adjusted, and the conditioned air CH1 adjusted to the desired temperature is blown toward the upper half of the occupant on the front seat side through the face outlet 24.

Further, the mixing ratio of the cold air C2 and the warm air H2 in the lower air mix chamber 23 is adjusted according to the opening degree of the lower air mix door 19, so that the conditioned air CH2 adjusted to the desired temperature is controlled. It is blown out toward the passenger's feet side on the front seat side through the air outlet 30.

(4) Foot differential blowing mode FIG. 4 is a sectional view showing the foot differential mode of the air conditioner of this embodiment. The face outlet 24 is closed, the defroster outlet 26 is opened, and the foot outlet 30 is opened. . At this time, the upper and lower air mix doors 18, 19 are shown in FIG.
When operated to the position indicated by the solid line, the above-described maximum heating state is set.

Therefore, the blown air from the blower unit passes through the evaporator 12, and then the entire amount thereof flows into the heater core 13 and is heated to become warm air. The warm air branches into upper and lower warm air passages 20 and 21, rises in the upper warm air passage 20 and is blown out toward the vehicle front window glass through the defroster outlet 26, and the lower warm air passage 21 And the warm air is blown toward the feet of the front seat occupant through the foot outlet 30.

Further, in order to control the temperature of the air blown into the vehicle compartment, the upper and lower air mix doors 18 and 19 are provided as shown in FIG.
4 is operated from the solid line position (maximum heating position) of FIG. 4 to the alternate long and short dash line position (intermediate opening position), the conditioned air CH adjusted to a desired temperature in accordance with the opening of the upper air mix door 18.
1 is blown out toward the vehicle front window glass through the defroster outlet 26.

Further, the mixing ratio of the cool air C2 and the warm air H2 in the lower air mix chamber 23 is adjusted according to the opening degree of the lower air mix door 19, and the conditioned air CH2 adjusted to the desired temperature is adjusted to the foot. Warm air is blown toward the feet of the front seat occupants through the air outlet 30.

(5) Defroster Blowout Mode FIG. 5 is a sectional view showing the diff mode of the air conditioner of this embodiment, in which the face outlet 24 is closed, the defroster outlet 26 is opened, and the foot outlet 30 is closed. At this time,
When the upper and lower air mix doors 18, 19 are operated to the positions indicated by the solid lines in FIG. 5, the maximum heating state described above is set.

Therefore, the blown air from the blower unit passes through the evaporator 12, and then the whole amount thereof flows into the heater core 13 to be heated and becomes warm air. This hot air is on the upper hot air passage 2
It rises to 0 and is blown out toward the vehicle front window glass through the defroster outlet 26.

When the upper air mix door 18 is operated from the solid line position (maximum heating position) in FIG. 5 to the alternate long and short dash line position (intermediate opening position) in FIG. 5 to control the temperature of the air blown into the passenger compartment, the upper side is opened. According to the opening degree of the air mix door 18, the conditioned air CH1 adjusted to a desired temperature is blown toward the vehicle front window glass through the defroster outlet 26.

As described above, according to this embodiment, since the two air mix doors 18 and 19 are provided, the length of each door is shortened while ensuring the cross-sectional area of the ventilation passage to the heater core 13. Since the rotation range of the mix doors 18 and 19 in the vehicle front-rear direction can be reduced, the air-conditioning case 11 can be thinned in the vehicle front-rear direction without reducing the air volume to the heater core 13.

The two air mix chambers 22,
23 is provided, the warm air that has passed through the heater core 13 is not raised to the upper air mix chamber 22,
Foot outlet 3 through lower air mix chamber 23
You can make it start from 0. Therefore, the conventional foot passage 211 shown in FIG. 6 can be eliminated, and the air conditioning case 11 in the vehicle front-rear direction can be made even thinner.

Further, according to this embodiment, the air flowing through the lower cool air passage 16 is guided by the foot door 31 toward the lower air mix chamber 23, so that the lower air mix chamber 16 passes through the lower cool air passage 16. The air flowing into 23 collides with the warm air flowing into the lower air mix chamber 23 through the lower warm air passage 21. Therefore, since the air mixability in the lower air mix chamber 23 can be improved, the lower air mix chamber 23 can be reduced in size while maintaining the above-mentioned mixability, and in turn, the size of the lower portion of the air conditioning case 11 can be increased. Can be suppressed.

Further, according to the present embodiment, since the two air mix doors 18 and 19 and the two air mix chambers 22 and 23 are provided, the air is blown from the face outlet 24 in the bilevel mode shown in FIG. The temperature of the conditioned air that is blown out and the temperature of the conditioned air that is blown out from the foot outlet 30 can be independently controlled, and the occupant can be provided with detailed air conditioning control. Also in the foot diff mode shown in FIG. 4, the temperature control of the conditioned air blown from the defroster outlet 26 and the temperature control of the conditioned air blown from the foot outlet 30 can be independently performed. , It is possible to provide fine air conditioning control to passengers.

Further, according to this embodiment, since the foot outlet 30 is arranged below the heater core 13, the vehicle front-rear direction is larger than that in the case where the foot outlet 30 is arranged on the vehicle rear side of the heater core 13. The width of the air conditioning case 11 can be further reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of a bilevel mode of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state of a face mode of the air conditioner shown in FIG.

FIG. 3 is a cross-sectional view showing a state of a foot mode of the air conditioner shown in FIG.

FIG. 4 is a cross-sectional view showing a state of the foot diff mode of the air conditioner shown in FIG.

5 is a cross-sectional view showing a state of the air conditioner shown in FIG. 1 in a differential mode.

FIG. 6 is a cross-sectional view showing a conventional air conditioner.

[Explanation of symbols]

11 ... Air conditioning case, 12 ... Evaporator (cooling heat exchanger), 13 ... Heater core (heating heat exchanger), 15 ... Upper cold air passage (first cold air passage), 16 ... Lower cold air passage (second cold air) Passage), 17a ... Upper opening (first warm air passage), 17b ... Lower opening (second warm air passage), 18 ... Upper air mix door (first air mix member), 19 ... Lower air mix Door (second air mix member), 20 ... Upper warm air passage (first warm air passage), 21 ... Lower warm air passage (second warm air passage), 22 ... Upper air mix chamber (first mixing portion) , 23 ... Lower air mix chamber (second mixing section), 30 ... Foot outlet, 31 ... Foot door (foot opening / closing member).

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshihiro Tahara             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO F-term (reference) 3L011 BH00 BP02 BR02

Claims (2)

[Claims] 1. An air-conditioning case (11) having a face outlet (24) for blowing conditioned air toward the upper half of the occupant and a foot outlet (30) for blowing conditioned air toward the feet of the occupant, A cooling heat exchanger (12) arranged substantially vertically in the air conditioning case (11) to cool air, and an air flow downstream side of the cooling heat exchanger (12) in the air conditioning case (11). And a heat exchanger for heating (13) for heating air, which is disposed in the air conditioner, and cold air formed in the air conditioning case (11) and passed through the heat exchanger for cooling (12), to the heat exchanger for heating ( 1
3) is formed in the air conditioning case (11) and a first cold air passage (15) that bypasses the face air outlet (24) and bypasses the cold air to the heating heat exchanger (13). A second cold air passage (16) leading to the foot air outlet (30) and the hot air formed in the air conditioning case (11) and passing through the heating heat exchanger (13). Two
4) a first warm air passage (17a, 20) and a second warm air passage (17b, 2) formed in the air conditioning case (11) and guiding the warm air to the foot outlet (30).
1) and the cold air and the first warm air passage (17) formed in the air conditioning case (11) and flowing through the first cold air passage (15).
a, 20), a first mixing part (22) for mixing with warm air flowing through the second cooling air passage (16), which is formed in the air conditioning case (11) and flows through the second cold air passage (16). Wind passage (17
b, 21) a second mixing section (23) for mixing with the hot air flowing through the first cold air passage (15) and the first warm air passage (17).
a, 20) and a first air mix member (18) for opening and closing
And the second cold air passage (16) and the second warm air passage (17).
b, 21) second air mix member (19) for opening and closing
And a foot opening / closing member (31) arranged in the air-conditioning case (11) to open / close the foot outlet (30), and the foot opening / closing member (31) allows the second cold air passage (16). An air conditioner for a vehicle, characterized in that cold air flowing through the air is guided toward the second mixing section (23). 2. The vehicle air conditioner according to claim 1, wherein the foot outlet (30) is arranged below the heating heat exchanger (13).