JP2001088533A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve comfortability by heating or cooling under the condition of temperature and humidity suitable for weak heating or weak cooling in early spring and late fall inside a vehicle such as a bus. SOLUTION: A discharge passage of a cold air blower of a cooler unit 12 is connected to a discharge passage of a hot air blower 68 of a heater unit 30 by a temperature regulating duct 40, and the temperature regulating duct 40 is communicated with a hot water passage 78 between a heater and the hot air blower 68 of the heater unit 30 by a by-pass passage. A valve device is provided in the temperature regulating duct 40, and the discharge passage of the cold air blower and the hot air passage 78 of the heater unit 30 are communicated with each other to attain weak heating regulated in temperature by leading cold air into the hot air passage 78 of the heater unit 30 and mixing it with hot air. At a request, a cold air passage 58 between an evaporator and the cold air blower is connected to the temperature regulating duct 40 by a by-pass passage 72, and hot air on the heater unit side is led into the cold air passage 58 and mixed with cold air to attain weak cooling regulated in temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner suitable for use in a vehicle, particularly a bus having a direct cooling system.

[0002]

2. Description of the Related Art Conventionally, there is an advantage in that it is widely used for a route bus due to an advantage in manufacturing cost, and there is an advantage that a trunk room having a sufficiently large capacity can be provided in a lower part of a side of a vehicle between front and rear wheels. So-called direct cooling systems are also used for buses. In a bus equipped with a direct connection type cooling device or system (hereinafter referred to as a direct connection type cooling bus), a cooling device and a heating device constitute a separate and independent system, and an evaporator and a cool air blower which form a main part of the cooling device are provided. The cooler unit is disposed on the ceiling of the vehicle body. Now, the schematic structure of the direct connection type cooling bus will be described with reference to the perspective view of FIG. 1 showing a preferred embodiment of the present invention for convenience.

A cooler unit 12 including at least an evaporator and a cool air blower is arranged on a ceiling near the front end of a bus body indicated generally by reference numeral 10 in FIG. 1, and cooperates in front of the cooler unit 12. The capacitor unit 14 is provided. In addition, a pair of cooler ducts 18 are provided extending in the front and rear direction of the vehicle along left and right sides of the ceiling portion of the vehicle compartment 16, and each of the cooler ducts 18 is laterally directed toward an upper portion of the central passage of the vehicle compartment 16. A number of outlets 20 for blowing cool air and a number of outlets 22 for blowing cool air downward toward a passenger seat are provided. Further, a pair of heater ducts 24 are provided along the left and right sides of the floor of the passenger compartment 16 and extend in the front-rear direction of the vehicle. Each of the heater ducts 24 has a large number of blowers for blowing warm air to the feet of passengers seated in the seats. An outlet 26 is provided.

In the vicinity of the front and rear ends of the heater duct 24, a heater for heating the air using the cooling water of the engine 28 as a heat source and a hot air blower for feeding the hot air heated by the heater into the heater duct 24 are stored. Heater unit 30 is provided. Each heater unit 30 includes
Although a water supply pipe 32 and a return pipe communicating with the cooling water system of the engine 28 are connected, only a part of the water supply pipe 32 is shown in FIG. 1 to avoid excessive congestion in the drawing, and the return pipe is omitted. I have. Further, a refrigerant compressor 34 driven by a belt by the engine 28 is provided, and the high-temperature and high-pressure refrigerant compressed by the compressor 34 is supplied to a refrigerant supply pipe 36.
Is sent to the condenser in the condenser unit 14,
It is cooled to become a high-temperature, high-pressure liquid-phase refrigerant. The liquid-phase refrigerant is supplied from a receiver (not shown) to an evaporator housed in the cooler unit 12 via an expansion valve, where the liquid-phase refrigerant takes heat from ambient air to be vaporized, and returns from the return pipe 38 to the compressor 34 again. Return to The air cooled by the evaporator is supplied to the outlets 20 and 2 of the cooler duct 18.
2 is supplied into the vehicle interior 16 to cool the vehicle interior air. In FIG. 1, the temperature control duct indicated by reference numeral 40 is a characteristic component of the present invention, as will be described later in detail, and is not provided in a conventional direct-connection cooling bus.

[0005] In the above-mentioned direct connection type cooling bus, when the temperature is high in summer,
A cooling system including the refrigerant compressor 34, the cooler unit 12, the condenser unit 14, and the cooler duct 18 is operated to cool the passenger compartment 16, and in a cold winter season, a heating system including the heater unit 30 and the heater duct 24 is operated. Heating of the passenger compartment 16 is performed. However, at the turn of the season, for example, early spring or late autumn, the temperature of the passenger compartment is often too high with normal heating, but it is cold without heating, so it may be preferable to perform weak heating. In this case, conventionally, a method has been adopted in which the cooling system and the heating system are simultaneously operated to blow cool air from the cooler duct 18 on the ceiling portion of the passenger compartment 16 and blow warm air from the heater duct 24 near the floor. However, there is a problem that the passenger is not always comfortable because the cold air and the hot air act on the occupant at the same time. Also, contrary to the above,
When performing cooling, the temperature in the cabin is too low for normal cooling, but it is hot without cooling, so weak cooling may be desirable.In this case, however, the conventional heating system and cooling system In the method of operating simultaneously, the same problem occurs, and there is a problem that the livability is impaired.

[0006]

SUMMARY OF THE INVENTION According to the present invention, comfortable weak heating can be easily achieved in a vehicle such as a directly connected cooling bus provided with a cooling system and a heating system which operate basically independently. It is another object of the present invention to provide a vehicle air conditioner capable of performing weak cooling if desired, thereby achieving an improvement in comfort.

[0007]

In order to achieve the above object, the present invention provides an evaporator for cooling air and a cooler duct provided in a vehicle interior and having a number of air outlets, which is supplied with cool air cooled by the evaporator. A cooler unit including a cool air blower for sending air, a heater for heating air using an engine cooling water as a heat source, and hot air heated by the heater to a heater duct provided in the vehicle interior and having a large number of outlets. A heater unit including a hot air blower,
A temperature control duct having one end communicating with the discharge passage of the cool air blower of the cooler unit and the other end communicating with the hot air passage between the heater of the heater unit and the hot air blower; A vehicle air conditioner comprising a valve device for controlling communication and shutoff between a discharge passage of a blower and a warm air passage of the heater unit is proposed.

[0008] In the present invention, the valve device may include a first position for communicating the discharge passage of the cooler unit with the warm air passage of the heater unit, and a first position for communicating the warm air passage of the heater unit with the vehicle interior air. Preferably, it is a three-way valve controlled to one of two positions. Further, in the present invention, a first bypass passage communicating the temperature control duct portion of the temperature control duct closer to the cooler duct than the valve device and a cool air passage between the evaporator of the cooler unit and the cool air blower is provided. A second bypass passage communicating between a temperature control duct portion of the temperature control duct closer to the heater duct than the valve device and a hot air passage of the hot air blower, wherein a second bypass passage is provided in the first bypass passage and the second bypass passage; And an on-off valve for controlling the communication and shutoff of the temperature control duct portion on the cooler duct side and the temperature control duct portion on the heater duct side with the discharge passage of the cool air blower and the discharge passage of the hot air blower. Is preferred.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Members and portions that are substantially the same as or correspond to the configuration of the conventional direct-coupled cooling bus are denoted by the same reference numerals, and redundant description is omitted. First,
FIG. 2 shows a cooling system and a heater unit 30 including the cooler unit 12 disposed substantially symmetrically with respect to the center line in the front-rear direction on the left and right sides of the ceiling portion of the vehicle body 10.
FIG. 3 is a conceptual plan view of a heating system including the above. (In the figure,
For convenience, only the left part facing the front of the vehicle is shown, but the same applies to the right. The left and right cooler units 12
A bottom plate 42 disposed on each of the left and right sides of the ceiling portion of the vehicle compartment 16 to form a part of the ceiling, and a normal roof panel of the vehicle body 16 in a portion not having a cooler shown by a two-dot chain line in FIG. An evaporator 48 and a plurality (four in the illustrated case) of cool air blowers 50 housed in a casing formed by a top plate 46 projecting upward from the top 44 are provided. The evaporator 48 is a plate-fin type heat exchanger having a large number of copper tubes through which the refrigerant supplied from the condenser unit 14 flows and a large number of fins made of a copper plate or an aluminum plate closely connected to the copper tube, The cool air blower 50 is a rotary blower such as a sirocco fan having a fan rotated by an electric motor. Each cool air blower 50
The discharge passages or ducts 52 of the cooler duct 1
8 is open.

The evaporator 48 is mounted on a receiving tray 54 for receiving condensed water generated by cooling air (hereinafter referred to as inside air) in the passenger compartment 16, and an inside air inlet 56 is provided in the bottom plate 42 adjacent to the receiving tray 54. And a cold air passage 5 between the evaporator 48 and the cool air blower 50.
8 are formed. As shown in FIGS. 1 and 2, the temperature control duct 40 is located on the left side of the vehicle body 10 along the vehicle body side wall slightly behind the door opening for getting on and off, and on the right side of the vehicle body 10 adjacent to the driver's seat. The upper end of one end is connected to the cooler unit 12 of the left and right cooler ducts 18 near the ceiling of the vehicle body near the ceiling of the vehicle body. A first opening / closing valve 60 for controlling communication with and shutoff from the valve 40 is provided. The other end of the temperature control duct 40 is connected to a discharge passage 62 of a heater unit 30 provided at a front portion in the vehicle compartment 16. A second opening / closing valve 64 for controlling communication and cutoff is provided. The heater unit 30 includes a warm air blower 66 composed of a rotary blower such as a sirocco fan similar to the cool air blower 50, and a heater 68.

A valve device comprising a three-way valve 70 is provided at an appropriate position of the temperature control duct 40 between the first and second on-off valves 60 and 64, and the three-way valve 70 has a T-shaped passage in the case shown in the figure. Although a rotary valve is shown, a valve device having an arbitrary structure such as a spool valve or a poppet valve capable of switching three passages can be used. The valve device 70 and the cooler duct 18
A first bypass passage 72 is provided between the temperature control duct portion 40a and the cold air passage 58, and one end of the first bypass passage 72 has a plurality of branch passages (in the illustrated example, as an example). The cold air passage 5 via two on each side)
8, and the other end is connected to the temperature control duct portion 40a via a third on-off valve 74. Further, a temperature control duct portion 40b between the valve device 70 and the heater duct 24.
A second bypass passage 80 is provided between a space between the discharge duct 76 of the hot air blower 66 of the front heater unit 30 and the heater 68, that is, a hot air passage 78. A fourth opening / closing valve 82 is provided at an appropriate position of 80, in the case shown, at a connection portion with the temperature control duct portion 40b. Although the first to fourth on-off valves 60, 64, 74 and 82 are all shown as butterfly valves in the drawing, any valve device such as a slide valve can be used.

The switching of the passage of the valve device 70 is controlled by a valve actuator 84, and the first to fourth on-off valves 60, 64, 74 and 82 are opened and closed by valve actuators 86, 88, 90 and 92, respectively. You. The valve actuators 84 to 92 are respectively controlled by a control unit 94, which controls the inside air temperature sensor 9 provided at an appropriate position in the vehicle interior 16.
6. The valve actuator 84 receives signals from the outside air temperature sensor 98, the sunshine sensor 100, and any number of auxiliary sensors 102 for detecting humidity and the like related to cooling and heating conditions.
To 92, respectively. The overall perspective view of FIG. 1 shows a conceptual configuration in a case where the present invention is applied to a directly connected cooling bus. However, in order to avoid excessive congestion in the drawing, the temperature control duct 40 on the left side of the vehicle compartment and The structure accompanying this is shown in some detail, but only a part of the corresponding members on the right side of the cabin is described.

FIGS. 3 to 7 show the operation of the air conditioner.
Will be described. 3 to 7
In FIG. 2, the warm air blower 66 of the heater unit 30 is shown as a suction blower and is arranged downstream of the heater 68, while in FIG. 2, the warm air blower 66 is shown as a push-in blower and arranged upstream of the heater 68. However, both are substantially equivalent, and either one can be appropriately selected. First, FIG. 3 shows, for the sake of convenience, a state in which only heating is performed in cold winter or the like, and a state in which only cooling is performed in hot summer or the like. At this time, the first to fourth on-off valves 60,
64, 74 and 82 and the valve device 70 as a three-way valve
Are controlled to the illustrated positions by valve actuators 86, 88, 90 and 92 and 84, respectively, which receive the drive output of the control unit 94. That is, the direct communication between the cooler duct 18 and the temperature control duct 40 is blocked by the first opening / closing valve 60 and the discharge passage 52 of the cool air blower 50 is provided.
Is communicated with the cooler duct 18, and the direct communication between the heater duct 24 and the temperature control duct 40 is blocked by the second opening / closing valve 64, and the discharge passage 62 for the warm air is communicated with the heater duct 24. At the same time, the first bypass passage 72 on the cooler unit 12 side is closed by the third on-off valve 74, and the second bypass passage 80 on the heater unit 30 side is closed by the fourth on-off valve 8.
2 closed.

Accordingly, when heating is performed in cold weather, the cooler unit 12 is of course inactive and the heater unit 30 is operating, so that as shown by the solid arrow in FIG. The inside air Ai or outside air Ao or the mixed air Ai + Ao of the inside air and outside air that has passed through the heater 68 becomes hot air, is supplied to the heater duct 24 by the hot air blower 66 through the hot air passage 78, and from a large number of outlets 26 The air is blown out into the chamber 16 and normal heating is performed. next,
FIG. 4 shows a state in which weak heating is performed in early spring, late autumn, or the like. At this time, based on the drive output of the control unit 94, the communication between the discharge passage 52 of the cool air blower 50 of the cooler unit 12 and the cooler duct 18 is interrupted by the first opening / closing valve 60, and the discharge passage 52 is connected to the temperature control duct 40. Communicated. Further, the first bypass passage 72 is closed by the third on-off valve 74. On the other hand, on the heater unit 30 side, the direct communication between the discharge passage 62 of the warm air delivery device 66 and the temperature control duct 40 is cut off by the second on-off valve 64, and the warm air discharge passage 62 and the heater duct 24 are connected. And the second on-off valve 82
The bypass passage 80 is open. Further, the valve device 70 in the temperature control duct 40 is located at a first position that allows the discharge passage 52 of the cooler unit 12 to communicate with the hot air passage 78 of the heater unit 30. Of course, both the heater unit 30 and the cooler unit 12 are operating. As a result, the cool air from the cooler unit 12 flows to the second bypass passage 80 through the temperature control duct 40 and the valve device 70, and the hot air passage 7
The temperature is adjusted by mixing with the warm air in the inside 8, and the regulated warm air at a low temperature is supplied to the heater duct 24 and blown out from the many outlets 26 into the passenger compartment 16, so that comfortable weak heating is performed. .

FIG. 5 shows a state in which intermediate heating between normal heating and the weak heating, that is, so-called weak heating is being performed. At this time, the cooler unit 12 is at rest, the first opening / closing valve 60 is at a position where the communication between the cooler duct 18 and the temperature control duct portion 40a is cut off by the drive output of the control unit 94, and the third opening / closing valve 74 is in the third position. One bypass passage 72 is closed. Further, the valve device 70 is located at a second position that allows the temperature control duct portion 40b closer to the heater duct 24 to communicate with the inside air of the passenger compartment 16, and the second position.
The on-off valve 64 is located at a position where the communication between the temperature control duct portion 40b and the heater duct 24 is interrupted, and the fourth on-off valve 82 is at an open position allowing the second bypass passage 80 to communicate with the temperature control duct portion 40b. As a result, the inside air Ai of the passenger compartment 16 enters the temperature control duct portion 40b through the valve device 70, flows into the warm air passage 78 through the second bypass passage 80, and
4 is mixed with the inside air Ai or the outside air Ao or the mixed air Ai + Ao of the two, and is supplied to the heater duct 24 as a regulated hot air at the intermediate temperature.
Since the air is blown into the passenger compartment 16 from the room 6, the desired weak heating is performed.

Referring back to FIG. 3, when the heater unit 30 is stopped and the cooler unit 12 is operated, the inside air Ai, the outside air Ao, or the mixed air Ai + Ao of the two as shown by the dotted arrows in the figure. Evaporator 5
4 and is supplied to the cooler duct 18 as cool air, and is blown into the passenger compartment 16 from a number of outlets 20 and 22 to perform normal cooling.

Next, FIG. 6 shows a state in which weak cooling is performed in spring, autumn and the like. At this time, the first on-off valve 60 is turned on by the command of the control unit 94.
0 is connected to the cooler duct 18 and is also driven to a position where the communication between the discharge passage 52 and the temperature control duct 40 is cut off. It communicates with the portion 40a.
The valve device 70 includes the temperature control duct portion 40a and the temperature control duct portion 4
0b, and the second on-off valve 64 cuts off the communication between the heater duct 24 and the discharge passage 62 of the warm air blower 66, and the second bypass passage 80 is closed by the fourth on-off valve 82. . When the cooler unit 12 and the heater unit 30 are operated in this state, the inside air A
i or outside air Ao or their mixed air Ai + Ao
Is heated by the heater 64 to become hot air, flows into the temperature control duct 40, and flows from the first bypass passage 72 into the cool air passage 58 of the cooler unit 12 via the valve device 70. The cool air passage 58 acts as a mixer chamber, and the evaporator 5
4 is mixed with the cool air passed through the cooler duct 4 to form a temperature-controlled cool air having a substantially uniform temperature.
Since the air is blown out of the passenger compartment 22 into the passenger compartment 16, the weak cooling that is comfortable for the passenger and the occupant is performed. Of course, at this time
The rear heater units other than the front heater unit 30 adjacent to the temperature control duct 40 are at rest, and unpleasant warm air is not blown from the feet of the seat.

FIG. 7 shows a state in which the cooling in the middle of the normal cooling shown in FIG. 3 and the weak cooling shown in FIG. 6, that is, the so-called weak cooling is performed. At this time, all the heater units 30 are at rest. On the other hand, according to a command from the control unit 78, the first and second on-off valves 60 and 64 are located at positions where the communication between the temperature control duct 40 and the cooler duct 18 and the heater duct 24 is cut off, respectively. The bypass passage 72 is opened, and the fourth on-off valve 82 closes the second bypass passage 80. further,
The valve device 70 is set at a position where the inside air of the vehicle compartment 16 flows into the temperature control duct portion 40a. Accordingly, the vehicle interior air Ai passes through the valve device 70 and is
The air flows into the cool air passage 58 of the cooler unit 12 through the bypass passage 72, and mixes with the cool air that has passed through the evaporator 54 to become a regulated cold air having a substantially uniform temperature. Weak cooling with a slightly higher cool air temperature is performed. At this time, since all the heater units 30 are of course at rest, unpleasant warm air is not blown from the feet of the seat.

According to the above configuration, the temperature control duct 40, the valve device 70 including the three-way valve, the first to fourth valves, while maintaining the advantage of the direct connection type cooling system which is essentially low in manufacturing cost.
By simply adding the on-off valves 60, 64, 74 and 82 and the first and second bypass passages 72 and 80, three types of heating modes including normal heating, weak heating, and weak heating in between these can be realized. Therefore, there is an advantage that the livability of a vehicle room such as a bus can be improved. In addition, if desired, three types of cooling modes, that is, normal cooling, weak cooling, and weak cooling in between, can be realized as desired. There are advantages that can be.

[0020]

As described above, the air conditioner for a vehicle according to the present invention provides an evaporator for cooling air and a cool air duct, which is provided in a vehicle interior and has a plurality of outlets, cooled by the evaporator. A cooler unit including a cool air blower for supplying air, a heater for heating air using the cooling water of the engine as a heat source, and a heater duct disposed in the vehicle interior and provided with a number of air outlets, to supply hot air heated by the heater to the heater duct. A heater unit including a hot air blower to be fed, and a temperature control having one end communicating with a discharge passage of the cool air blower of the cooler unit and the other end communicating with a hot air passage between the heater of the heater unit and the hot air blower. A duct, and a valve device disposed in the tuned temperature duct and configured to control communication and shutoff between a discharge passage of the cold air blower and a warm air passage of the heater unit. , While sparing the benefits of manufacturing cost is low direct type cooling system and a heating system provided in the bus or the like in the cooling system generally as described above,
By combining them, at least two stages of normal heating and weak heating can be supplied to the interior of the vehicle at a pre-conditioned uniform temperature, so that it is possible to improve the livability of the interior of the vehicle. Further, in the present invention, the valve device communicates a first position for selectively communicating a discharge passage of the cooler unit with a warm air passage of the heater unit, and a warm air passage of the heater unit and vehicle interior air. A three-way valve controlled to any one of the second positions to be controlled, and a cool air passage between an evaporator of the cooler unit and a cool air blower, and a temperature control duct portion of the temperature control duct closer to a cooler duct than the valve device. And a second bypass passage communicating the temperature control duct portion of the temperature control duct closer to the heater duct than the valve device of the temperature control duct and the hot air passage of the hot air blower. An on-off valve provided in each of the first bypass passage and the second bypass passage, and a temperature control duct portion on the cooler duct side and a temperature control duct portion on the heater duct side; By providing an open / close valve for controlling communication with the cold air blower discharge passage and the hot air blower discharge passage, and shutting off, the warm air temperature during heating can be reduced to three stages: normal heating, weak heating, and weak heating in between. It is possible to control the temperature and, if desired, the temperature of the cold air during cooling can be controlled in three stages: normal cooling, weak cooling and weak cooling in between.
There is an advantage that the livability can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an entire vehicle showing a preferred embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the entire heating and cooling system including the cooler unit 12 and the heater unit 30 in FIG.

FIG. 3 is a schematic explanatory view showing an operation mode of each component of the heating and cooling device when normal heating or cooling is performed.

FIG. 4 is a schematic explanatory view showing an operation mode of each component of the heating and cooling device when weak heating is performed.

FIG. 5 is a schematic explanatory view showing an operation mode of each component of the heating and cooling device in a case where weak heating at an intermediate level between normal heating and weak heating is performed.

FIG. 6 is a schematic explanatory view showing an operation mode of each component of the heating and cooling device when weak cooling is performed.

FIG. 7 is a schematic explanatory view showing an operation mode of each component of the heating and cooling device in a case where weak cooling is performed at an intermediate level between normal cooling and weak cooling.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Bus body, 12 ... Cooler unit, 14 ... Condenser unit, 16 ... Cabin room, 18 ... Cooler duct, 24
... heater duct, 28 ... engine, 30 ... heater unit, 34 ... refrigerant compressor, 40 ... temperature control duct, 48
... Evaporator, 50 ... Cool air blower, 52 ... Discharge passage,
56 ... inside air intake, 58 ... cold air passage, 60 ... first on-off valve, 62 ... discharge passage, 64 ... second on-off valve, 66 ... hot air blower, 68 ... heater, 70 ... valve device (three-way valve), 72 …
First bypass passage, 74: third on-off valve, 78: hot air passage, 80: second bypass passage, 82: fourth on-off valve, 84
-92: valve actuator, 94: control unit.

Claims (3)

[Claims] 1. A cooler unit including an evaporator for cooling air, a cool air blower for supplying cool air cooled by the evaporator to a cooler duct provided in a vehicle interior and having a plurality of outlets, and cooling water for an engine. A heater unit including a heater for heating air as a heat source and a hot air blower for supplying hot air heated by the heater to a heater duct provided in the vehicle interior and having a number of air outlets;
A temperature control duct having one end communicating with the discharge passage of the cool air blower of the cooler unit and the other end communicating with the hot air passage between the heater of the heater unit and the hot air blower; An air conditioner for a vehicle, comprising: a valve device that controls communication and cutoff between a discharge passage of a blower and a warm air passage of the heater unit. 2. A first valve for communicating a discharge passage of the cooler unit with a warm air passage of the heater unit.
The air conditioner for a vehicle according to claim 1, wherein the three-way valve is controlled to any one of a position and a second position that allows communication between the warm air passage of the heater unit and the vehicle interior air. 3. A first bypass passage communicating between a temperature control duct portion of the temperature control duct closer to a cooler duct than the valve device and a cool air passage between an evaporator of the cooler unit and a cool air blower, A second bypass passage communicating between a temperature control duct portion on the heater duct side of the valve device of the temperature control duct and a hot air passage of the hot air blower, and a first bypass passage and a second bypass passage are provided; Opening / closing valves are provided in the first bypass passage and the second bypass passage, respectively, and the temperature control duct portion on the cooler duct side and the temperature control duct portion on the heater duct side; the cold air blower discharge passage and the hot air blower discharge passage; 3. An air conditioner for a vehicle according to claim 1, further comprising an on-off valve for controlling communication and shutoff of the air conditioner.