JP4075206B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the conditioned air passage is divided into a first air passage on the outside air side and a second air passage on the inside air side to form a two-layer flow mode. The present invention relates to a vehicle air conditioner that recirculates and blows off air, and blows out low-humidity outside air from a defroster air outlet to achieve both improvement in heating capacity and anti-fogging property of window glass.
[0002]
[Prior art]
As a prior art of the vehicle air conditioner as described above, there is one disclosed in Japanese Patent Laid-Open No. 10-338019.
FIG. 3 shows a state in which the blowing mode is the foot mode and the inside / outside air mode is the normal (all outside air or all inside air) mode in this prior art, and is introduced from the air inlet (not shown) of the air conditioning case 31. As shown by the arrows in the figure, the air that has passed through the first and second air passages 20a and 20b, the evaporator 32, and the heater core 33 joins in the first hot air passage 39, and then branches again to a large extent. Passes through the communication port 45, reaches the front and rear seat foot openings 44 and 50, and blows out to the feet of the passengers. The remainder of the warm air reaches the defroster opening 42 side and blows out to the inner surface of the window glass.
[0003]
FIG. 4 shows a state in which the blowing mode is the foot mode and the inside / outside air mode is the two-layer flow mode, and the warm air bypass door 41 defines the first warm air passage 39 immediately after the heater core 33. At the same time, the hot air bypass opening 40 is opened.
As a result, the inside air that has flowed into the second air passage 21a passes through the heater core 33, reaches the front seat and rear seat foot openings 44, 50 via the warm air bypass opening 40, and blows out to the feet of the passengers. On the other hand, outside air that has flowed into the first air passage 20a passes through the heater core 33, passes through the first hot air passage 39, reaches the defroster opening 42 side, and blows out to the inner surface of the window glass without intersecting with the inside air. Further, a part of the outside air passes through the communication port 45 and reaches the front and rear seat foot openings 44 and 50 and is blown out to the feet of the passengers.
[0004]
In the normal mode, the hot air bypass opening 40 is blocked, and the ventilation resistance of the second warm air passage 46 on the side of the foot openings 44 and 50 increases, and the amount of air blown from the foot openings 44 and 50 decreases. On the other hand, since the warm air bypass opening 40 is opened in the two-layer flow mode, the ventilation resistance of the second warm air passage 46 is reduced, and the amount of air blown from the foot openings 44 and 50 is increased. As a result, the blowout air volume ratio from the defroster opening 42 and the foot openings 44 and 50 changes.
[0005]
Therefore, in the above prior art, the opening degree of the communication port 45 is adjusted by the foot door 49 in conjunction with the switching between the normal mode and the two-layer flow mode. The defroster opening 42 and the foot opening are offset by increasing the opening of 45 and canceling the increase in ventilation resistance, and by reducing the opening of the communication port 45 and canceling the decrease in ventilation resistance in the two-layer flow mode. The change of the blowing air volume ratio from 44 and 50 is suppressed.
[0006]
[Problems to be solved by the invention]
By the way, the foot door 49 needs to be operated both when the blow mode is changed and when the inside / outside air mode is switched. In this case, the foot door 49 is moved by the blow mode lever and the inside / outside air mode lever provided on the air conditioning operation panel. Manual operation is difficult due to the mechanism.
[0007]
Therefore, conventionally, the foot door 49 is driven together with the defroster door 47 and the face door 48 by one servo motor.
However, this servo motor is a high-functional type capable of reciprocating rotation in which the stop position is set in 5 to 6 stages, and has a problem of being extremely expensive.
Therefore, in view of the above points, the present invention makes it possible to achieve fluctuation suppression of the blowout air flow rate ratio accompanying the switching between the inside and outside air modes without adjustment by the foot door, and to make it possible to manually operate the blowing mode door such as the foot door. Objective.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first and second aspects of the invention, at least the maximum heating state is set in the blowing mode in which both the foot opening (44, 50) and the defroster opening (42) are simultaneously opened. The conditioned air passage is partitioned into a first air passage (20, 20a) through which the outside air flows and a second air passage (21, 21a) through which the inside air flows,
A vehicle air conditioner for communicating the first air passage (20, 20a) with the defroster opening (42) and the second air passage (21, 21a) with the foot opening (44, 50),
A first hot air passage (39) for guiding the hot air that has passed through the heating heat exchanger (33) to the defroster opening (42) side;
A second hot air passage (46) for directing the hot air that has passed through the heating heat exchanger (33) directly to the foot openings (44, 50), bypassing the first hot air passage (39);
A hot air bypass door (41) for opening and closing the inlet (40) of the second hot air passage (46);
A communication port (45) for guiding the warm air that has passed through the first warm air passage (39) to the second warm air passage (46);
A foot door (49) for opening and closing the communication port (45) according to the blowing mode;
An adjustment door (51) for adjusting the communication area between the communication port (45) and the second hot air passage (46);
With the transition from the normal mode in which the hot air bypass door (41) closes the inlet portion (40) to the two-layer flow mode in which the hot air bypass door (41) opens the inlet portion (40). The adjustment door (51) is operated to a position that reduces the communication area.
[0009]
According to this, the fluctuation | variation of the ventilation resistance of the 2nd warm air channel | path (46) accompanying opening and closing of the entrance part (40) of a 2nd warm air channel | path (46) can be canceled by the action | operation of an adjustment door (51). Even if the two-layer flow mode and the normal mode are switched, it is possible to effectively suppress the change in the ratio of the blown air volume from the foot opening (44, 50) and the blown air volume from the defroster opening (42). . In other words, the function of suppressing fluctuation in the blown air volume ratio that has been obtained by the foot door (49) can be achieved by the adjusting door (51).
[0010]
Accordingly, since the foot door (49) only needs to be operated when the blow mode is changed, the blow mode door such as the foot door (49) can be manually operated by the blow mode lever provided on the air-conditioning operation panel. A motor is unnecessary, and the cost can be greatly reduced.
As in the second aspect of the invention, the hot air bypass door (41) and the adjustment door (51) can be connected and linked by a link (53).
[0011]
In addition, the code | symbol in the above-mentioned parenthesis shows the correspondence with the specific means of embodiment description later mentioned.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 and FIG. 2 are schematic cross-sectional views showing the overall configuration of a ventilation system of a vehicle air conditioner according to an embodiment of the present invention. This embodiment is used for a vehicle equipped with a diesel engine, an electric vehicle, a hybrid vehicle, and the like. Thus, it is suitable for an air conditioner in a vehicle in which it is difficult to secure a sufficient heat source for heating, and the inside / outside air two-layer flow mode can be set during maximum heating. FIG. 1 shows an all outside air (normal) mode setting state, and FIG. 2 shows an inside / outside air two-layer flow mode setting state.
[0013]
In the figure, the air conditioning system ventilation system is roughly divided into two parts, a blower unit 10 and an air conditioning unit 30. The air blower unit 10 part is usually arranged offset from the center part to the passenger seat side in the lower part of the instrument panel in the passenger compartment, and the air conditioning unit 30 part is the left and right side of the vehicle in the lower part of the instrument panel in the passenger compartment. Arranged in the approximate center of the direction.
[0014]
The air conditioning unit 30 is mounted as shown by the arrows in the vertical and longitudinal directions of the vehicle. In FIG. 1, for convenience of illustration of the blower unit 10 part, for convenience, the blower unit 10 part is disposed on the vehicle front side of the air conditioning unit 30 part, but in reality, the blower unit 10 part is disposed on the side of the air conditioning unit 30 part. Is done.
Next, the blower unit 10 will be described in detail. First and second inside air introduction ports 11 and 12 for introducing inside air (vehicle compartment air) and outside air (vehicle compartment outside air) are introduced into the fan unit 10. An outside air inlet 13 is provided. These inlets 11 to 13 can be opened and closed by first and second inside / outside air switching doors 14 and 15, respectively.
[0015]
And the 1st (outside air side) fan 16 and the 2nd (inside air side) fan 17 which ventilate the introduction air from the said inlets 11-13 are arrange | positioned in the air blower unit 1 up and down. Both fans 16 and 17 are well-known centrifugal multiblade fans, and are driven to rotate simultaneously by a common electric motor 18.
In the all outside air mode of FIG. 1, the first inside / outside air switching door 14 closes the first inside air introduction port 11 and opens the outside air introduction port 13, and the second inside / outside air switching door 15 opens the communication path 19. Thus, the second inside air introduction port 12 is closed. Therefore, outside air is sucked into the suction port 16 a of the first fan 16 and the suction port 17 a of the second fan 17 from the outside air introduction port 13, and is blown to the first air passage 20 and the second air passage 21.
[0016]
On the other hand, in the two-layer flow mode of FIG. 2, the second inside / outside air switching door 15 opens the second inside air introduction port 12 and closes the communication path 19. For this reason, the inside air is sucked into the suction port 17 a of the second fan 17 from the second inside air introduction port 12 and blown into the second air passage 21.
Next, the air conditioning unit 30 is of a type in which both an evaporator (cooling heat exchanger) 32 and a heater core (heating heat exchanger) 33 are integrally incorporated in an air conditioning case 31.
[0017]
In the air conditioning case 31, the upstream portion of the evaporator 32 is partitioned into first and second air passages 20 a and 21 a by a partition plate 34. The air blown from the first and second air passages 20 and 21 of the blower unit 10 flows into the first and second air passages 20a and 21a. As is well known, the evaporator 32 absorbs the latent heat of evaporation of the refrigerant in the refrigeration cycle from the conditioned air to cool the blown air.
[0018]
A heater core 33 is disposed adjacent to the downstream side of the evaporator 32 (on the rear side of the vehicle) with a predetermined interval. Here, the heater core 33 is inclined and arranged at a predetermined angle on the vehicle rear side. The heater core 33 reheats the cold air that has passed through the evaporator 32, and hot water (engine cooling water) that is a heat source fluid flows through the heater core 33 and heats the air using the hot water as a heat source. is there.
[0019]
In the air conditioning case 31, a cold air bypass passage 35 that bypasses the heater core 33 and flows air (cold air) is formed above the heater core 33.
Within the air conditioning case 31, between the heater core 33 and the evaporator 32, the air volume ratio between the hot air heated by the heater core 33 and the cold air bypassing the heater core 33 (that is, the cold air flowing through the cold air bypass passage 35) is adjusted. A flat main air mix door (temperature adjusting means) 36 and an auxiliary air mix door (temperature adjusting means) 37 are arranged. Here, both the air mix doors 36 and 37 are rotatable in the vehicle vertical direction.
[0020]
The main air mix door 36 and the auxiliary air mix door 37 are arranged in a vertical direction at a predetermined interval, and can be operated at an arbitrary rotational position so as not to interfere with each other. Further, at the time of maximum cooling, the air mix doors 36 and 37 are rotated to a position where they are overlapped with each other, and the air inflow path to the heater core 33 is fully closed.
On the other hand, at the time of maximum heating, the air mix doors 36 and 37 are rotated to the positions indicated by solid lines in FIGS. 1 and 2, so that the main air mix door 36 fully closes the cold air bypass passage 35 and simultaneously the auxiliary air mix door 37. Is positioned in the vicinity of the central position in the vertical direction immediately after the evaporator 32, the auxiliary air mix door 37 serves as an air passage between the evaporator 32 and the heater core 33 for the first air passage 20 a and the second air passage. It acts as a movable partition member partitioned into 21a.
[0021]
In the air conditioning case 31, a partition wall 38 extending in the vertical direction with a predetermined interval from the heater core 33 is integrally formed in the air conditioning case 31 on the downstream side of the heater core 33 (part on the vehicle rear side). The partition wall 38 forms a first hot air passage 39 that extends upward immediately after the heater core 33. The hot air from the hot air passage 39 and the cold air from the cold air bypass passage 35 are mixed in the upper part of the heater core 33.
[0022]
A hot air bypass opening (inlet part) 40 is opened at the lower end of the partition wall 38, and the hot air bypass opening 40 is opened and closed by a plate-like hot air bypass door 41. In the two-layer flow mode, the hot air bypass door 41 is operated to the position indicated by the solid line in FIG. 2 (substantially central position in the vertical direction of the heater core 33), and the first hot air passage 39 immediately after the heater core 33 is moved through the first air passage 20a. And the second air passage 21a function as a movable partition member.
[0023]
On the other hand, in a mode other than the two-layer flow mode, the hot air bypass door 41 is operated to the position indicated by the solid line in FIG. 1 to close the hot air bypass opening 40 and eliminate the partitioning action on the first hot air passage 39 immediately after the heater core 33. To do.
A defroster opening 42 connected to a defroster outlet (not shown) for blowing wind toward the inner surface of the vehicle window glass is opened at a front portion of the air conditioning case 31 on the front side of the vehicle. In addition, a face connected to a face outlet (not shown) that blows wind toward the head of the occupant at a position on the upper surface of the air conditioning case 31 on the vehicle rear side (close to the occupant) with respect to the defroster opening 42. The opening 43 is open. Further, in the air conditioning case 31, front seat foot openings connected to front seat foot outlets (not shown) for blowing wind toward the feet of the front seat occupants are provided on the left and right side surfaces on the vehicle rear side. The part 44 is open.
[0024]
In this front seat foot opening 44, conditioned air whose temperature is controlled by mixing cold and hot air flows from the upper side of the heater core 33 through the communication passage 45 and the hot air bypass opening 40 is opened. The warm air from the warm air bypass opening 40 flows through the second warm air passage 46.
The communication ports 45 of the defroster opening 42, the face opening 43, and the front seat foot opening 44 are respectively rotatable plate-like blowing mode doors, that is, a defroster door 47, a face door 48, Opened and closed by the foot door 49. These blowing mode doors 47, 48, 49 are connected to a blowing mode lever (not shown) provided on the air conditioning operation panel via a link mechanism (not shown) and an operation cable (not shown). It is designed to be manually operated.
[0025]
Further, in the air conditioning case 31, a rear seat foot opening 50 is opened at the lower end portion on the vehicle rear side (close to the occupant) so as to face immediately after the hot air bypass opening 40. Hot air from the warm air bypass opening 40 and the second warm air passage 46 flows into the rear seat foot opening 50, and this warm air flows through the rear seat foot duct (not shown). Hot air is blown out from the exit to the feet of passengers.
[0026]
In the second hot air passage 46, the front seat foot opening 44 and the communication port 45 are located at positions close to the end of the front seat foot opening 44 on the side of the communication port 45 (upper side in FIG. 1). An adjustment door 51 for adjusting the communication area is provided and is rotatably supported by a shaft 52.
The adjustment door 51 is connected to the warm air bypass door 41 by a link 53 disposed outside the air conditioning case 31, and both the doors 41 and 51 are linked to the first and second inside / outside air switching doors 14 and 15 ( (Not shown). These four doors 14, 15, 41, 51 are connected to an inside / outside air mode lever (not shown) provided on the air conditioning operation panel via an operation cable (not shown) and are manually operated. It is like that.
[0027]
In the full outside air mode of FIG. 1, the adjustment door 51 is operated to the position indicated by the solid line in FIG. 1 to fully open the front seat foot opening 44 and the communication port 45. On the other hand, in the two-layer flow mode, the adjustment door 51 is operated to the solid line position in FIG. 2 to reduce the communication area between the communication port 45 and the second hot air passage 46.
Next, the operation of this embodiment in the above configuration will be described.
[0028]
FIG. 1 shows a state of all outside air (normal) mode in which only outside air is introduced in the foot blowing mode. In this state, the outside air introduction port 13 communicates with the suction port 16 a of the first fan 16 and the suction port 17 a of the second fan 17.
In the air conditioning unit 30, the hot air bypass door 41 closes the hot air bypass opening 40 and eliminates the partitioning action on the first hot air passage 39 immediately after the heater core 33. Further, the adjustment door 51 fully opens between the front seat foot opening 44 and the communication port 45.
[0029]
Further, by manual operation of the blowout mode lever, the defroster door 47 is in a small opening position and the defroster opening 42 is slightly opened, the face door 48 fully closes the face opening 43, and the foot door 49 is a communication port 45. Is fully open.
Therefore, by operating the fans 16 and 17, outside air flows through the first and second air passages 20a and 21a, and all the outside air passes through the heater core 33 and is heated to the maximum. All the warm air heated by the heater core 33 rises in the first warm air passage 39, and most of the warm air passes through the communication port 45 to the front and rear seat foot openings 44, 50 side, and to the passenger's feet. Blow out. Further, the remaining hot air reaches the defroster opening 42 side and blows out to the inner surface of the window glass.
[0030]
At this time, the ratio of the blown air volume from the defroster opening 42 and the blown air volume from the foot openings 44 and 50 is set to a predetermined ratio as described below.
That is, by operating the defroster door 47 to the small opening position, the ventilation resistance of the air passage on the defroster opening 42 side is increased, and the dynamic pressure of the hot air flowing through the first hot air passage 39 is increased in the direction of the communication port 45. The hot air is guided by the foot door 49 so as to face, so that the hot air easily flows into the second hot air passage 46.
[0031]
Further, since the ventilation resistance of the second warm air passage 46 is increased due to the blockage of the warm air bypass opening 40, the increase in the ventilation resistance is offset by operating the adjustment door 51 to the fully open position.
As described above, the amount of air blown from the foot openings 44 and 50 can be set to about 80%, and the amount of air blown from the defroster opening 42 can be set to about 20%.
[0032]
In addition, by appropriately setting the airflow resistance from the foot openings 44 and 50 to the foot outlets, the amount of air blown from the front seat foot openings 44 is reduced to about 45% of the total amount of air blown to the rear seat. The blowing air volume from the foot opening 50 can be set to about 35% of the total blowing air volume.
By operating both air mix doors 36 and 37 to the intermediate opening position, a part of the air flows through the cold air bypass passage 35 without passing through the heater core 33, and the cold air and the hot air that has passed through the heater core 33. And the blown air is adjusted to a predetermined temperature.
[0033]
Further, when the first and second inside / outside air switching doors 14 and 15 are operated to enter the all inside air (normal) mode in which both the first and second inside air introduction ports are opened, the openings 42, 44, and 50 The blown air volume is adjusted in the same manner as in the all outside air mode, and therefore the ratio of the blown air volume does not change.
FIG. 2 shows a state in which the maximum heating state is set and the two-layer flow mode is set in the foot blowing mode. In this state, in the blower unit 10, the outside air introduction port 13 communicates with the suction port 16 a of the first fan 16, and the second inside air introduction port 12 communicates with the suction port 17 a of the second fan 17. Therefore, in this state, the first fan 16 blows outside air from the outside air inlet 13 to the first air passage 20, and the second fan 17 sends inside air from the second inside air inlet 12 to the second air passage 21. To blow.
[0034]
In the air conditioning unit 30, both the air mix doors 36 and 37 are rotated to the position indicated by the solid line in FIG. 2 so that the main air mix door 36 fully closes the cold air bypass passage 36 and at the same time the auxiliary air mix door 37. The front end portion is positioned in the vicinity of the central position in the vertical direction immediately after the evaporator 32, so that the ventilation path of the heater core 33 is fully opened. At this time, the air passage between the evaporator 32 and the heater core 33 is divided into the first air passage 20a and the second air passage 21a by the auxiliary air mix door 37.
[0035]
Further, the hot air bypass door 41 is operated to the position indicated by the solid line in FIG. 2 to partition the first hot air passage 39 immediately after the heater core 33 and open the hot air bypass opening 40.
Further, the adjustment door 51 is operated to the position indicated by the solid line in FIG. 2 to reduce the communication area between the front seat foot opening 44 and the communication port 45.
[0036]
The opening positions of the three blow-out mode doors 47, 48, 49 are the same as in the all outside air mode of FIG.
Accordingly, by operating the fans 16 and 17, the inside air from the second inside air introduction port 12 and the outside air from the outside air introduction port 13 are partitioned by the partition members 34, 37, and 41, and the first air passage 20a and the first air passage 20a are separated from each other. The two air passages 21a flow separately from each other. All the inside air and outside air pass through the heater core 33 and are heated to the maximum.
[0037]
After the inside air is heated by the heater core 33, it passes through the warm air bypass opening 40 and the second warm air passage 46 to reach the front seat and rear seat foot openings 44 and 50. On the other hand, after the outside air is heated by the heater core 33, it branches into two flows through the first warm air passage 39 above the warm air bypass door 41, and one of the outside air flows into the defroster opening 42. The remaining outside air flows into the front seat foot opening 44 through the communication port 45.
[0038]
As a result, since the warm air which heated the low humidity outside air flows through the defroster opening 42 and the warm air of the low humidity blows out to the inner surface of the window glass, the antifogging property of the window glass can be ensured satisfactorily. In addition, warm air having a high temperature that mainly heats the inside air is blown out to the front and rear foot openings 44 and 50 to improve the heating effect. In FIG. 2, an arrow D indicates the flow of outside air, and an arrow E indicates the flow of internal air.
[0039]
Here, since the ventilation resistance of the second warm air passage 46 is reduced by opening the warm air bypass opening 40, the communication area between the front seat foot opening 44 and the communication port 45 is reduced by the adjustment door 51. Therefore, the decrease in ventilation resistance is offset.
Thereby, even if there is switching between the all-outside air mode and the two-layer flow mode, it is possible to effectively suppress the change in the ratio of the blown air volume from the defroster opening 42 and the foot openings 44 and 50.
[0040]
As described above, according to the present embodiment, the adjustment door 51 can achieve the function of suppressing the fluctuation of the blown air volume ratio that has been conventionally obtained by the foot door 49. Accordingly, since the foot door 49 only needs to be operated when the blowing mode is changed, the blowing mode doors of the defroster door 47, the face door 48 and the foot door 49 can be manually operated by the blowing mode lever provided on the air conditioning operation panel. Expensive servo motors are not required, and the cost can be greatly reduced.
[0041]
Next, in the foot defroster blowing mode in which the amount of air blown from the defroster opening 42 is substantially equal to the amount of air blown from the foot openings 44 and 50, the defroster door 47 is opened more than the state of FIGS. The opening degree of the part 42 is increased, and the foot door 49 decreases the opening degree of the communication port 49.
In the all-outside air mode of the foot defroster blowing mode, the amount of blown air from the defroster opening 42 and the amount of blown air from the foot openings 44 and 50 can be set substantially equal to each other by increasing the opening of the defroster opening 42.
[0042]
On the other hand, in the two-layer flow mode of the foot defroster blowing mode, the amount of air flowing into the second hot air passage 46 through the communication port 45 is limited to about 50% due to the decrease in the opening of the communication port 49, and the defroster opening The amount of air blown from the portion 42 and the amount of air blown from the foot openings 44 and 50 are adjusted to be approximately the same.
In the face blowing mode, the defroster door 47 fully closes the defroster opening 42, the face door 48 fully opens the face opening 43, and the foot door 49 fully closes the communication port 45 from the state shown in FIG. Further, at the time of maximum cooling, the air mix doors 36 and 37 fully close the air inflow path to the heater core 33. Therefore, all the cold air cooled by the evaporator 32 passes through the cold air bypass passage 35 and is blown out from the face opening 43. The air temperature in the face blowing mode can be arbitrarily adjusted by rotating both the air mix doors 36 and 37 from the maximum cooling state to the maximum heating side.
[0043]
In the bi-level blowing mode, the foot door 49 opens the communication port 45 with respect to the face blowing mode. Thereby, the cold air from the cold air bypass passage 35 mainly flows to the face opening 43 side, and the warm air from the first hot air passage 39 mainly flows to the foot openings 44 and 50 side. Becomes lower than the blowing temperature on the side of the foot openings 44 and 50, and the blowing temperature distribution of head cold foot heat is obtained.
[0044]
In the defroster blowing mode, the defroster door 47 fully opens the defroster opening 42, the face door 48 fully closes the face opening 43, and the foot door 49 fully closes the communication port 45. Accordingly, the air whose temperature is adjusted by the air mix doors 36 and 37 is blown out from the defroster opening 42.
(Other embodiments)
In the above embodiment, the adjustment door 51 is connected to the hot air bypass door 41 and the first and second inside / outside air switching doors 14 and 15 and is manually operated by an inside / outside air mode lever (not shown). However, the adjustment door 51 may be driven by a motor alone, or the adjustment door 51 and the hot air bypass door 41 may be driven by one motor. In this case, an inexpensive servo motor having two stop positions and a one-way rotation type can be used.
[0045]
Moreover, the 1st, 2nd inside / outside air switching doors 14 and 15, the warm air bypass door 41, and the adjustment door 51 can also be driven by one motor.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of an entire ventilation system of a vehicle air conditioner showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state of a two laminar flow mode in the foot blowing mode of the embodiment.
FIG. 3 is a schematic cross-sectional view of the entire ventilation system of an air conditioning unit of a conventional device.
FIG. 4 is a cross-sectional view showing a state of a two-layer flow mode in a foot blowing mode of the conventional apparatus.
[Explanation of symbols]
20, 20a ... first air passage, 21, 21a ... second air passage,
31 ... Air conditioning case, 33 ... Heater core (heat exchanger for heating),
36, 37 ... Air mix door (temperature adjusting means), 39 ... First hot air passage,
40 ... Warm air bypass opening (entrance), 41 ... Warm air bypass door,
42 ... defroster opening, 44, 50 ... foot opening, 45 ... communication port,
46 ... second hot air passage, 49 ... foot door, 51 ... adjusting door.

Claims (2)

A heating heat exchanger (33) for heating conditioned air;
Temperature adjusting means (36, 37) for adjusting the air temperature by adjusting the heating amount of the conditioned air by the heating heat exchanger (33);
A foot opening (44, 50) connected to a foot outlet for blowing wind toward the feet of passengers in the passenger compartment;
A defroster opening (42) connected to a defroster outlet for blowing wind toward the inner surface of the vehicle window glass;
In the blowing mode in which both the foot opening (44, 50) and the defroster opening (42) are simultaneously opened, the temperature adjusting means (36, 37) is operated at the maximum position where the heating amount is maximized. When the heating state is set, at least the conditioned air passage is partitioned into a first air passage (20, 20a) through which the outside air flows and a second air passage (21, 21a) through which the inside air flows,
A vehicle air conditioner that communicates the first air passage (20, 20a) with the defroster opening (42) and communicates the second air passage (21, 21a) with the foot opening (44, 50). Because
A first hot air passage (39) for guiding the hot air that has passed through the heating heat exchanger (33) to the defroster opening (42) side;
A second hot air passage (46) for directing the warm air that has passed through the heating heat exchanger (33) directly to the foot openings (44, 50), bypassing the first hot air passage (39); ,
A hot air bypass door (41) for opening and closing the inlet (40) of the second hot air passage (46);
A communication port (45) for guiding the warm air that has passed through the first warm air passage (39) to the second warm air passage (46);
A foot door (49) for opening and closing the communication port (45) according to the blowing mode;
An adjustment door (51) for adjusting a communication area between the communication port (45) and the second hot air passage (46);
Transition from the normal mode in which the hot air bypass door (41) closes the inlet portion (40) to the two-layer flow mode in which the hot air bypass door (41) opens the inlet portion (40) Accordingly, the adjustment door (51) is operated to a position where the communication area is reduced. The vehicle air conditioner according to claim 1, wherein the warm air bypass door (41) and the adjustment door (51) are connected and linked by a link (53).

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