JPH07205633A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To dehumidify/heat inside a car room without providing a heat exchanger to dehumidity air in an air conditioning duct to jet the air into the car room. CONSTITUTION:An exterior heat exchanger 3 which serves as a condenser during a cooling period, and serves as an evaporator during a heating period and a dehumidification/heating period is provided outside a car room. An outside air introducing duct 5 wherein outside air passed through the exterior heat exchanger 3 is introduced into an air conditioning duct 7 during the humidification/heating period is connected to the exterior heat exchanger 3. An interior heat exchanger 20 which serves as the evaporator during the cooling period, and serves as the condenser during the humidification/heating period is arranged in the air conditioning duct 7. The inside of the air conditioning duct 7 is divided in a first layer 23 to jet air to a face and a differential and a second layer 24 to introduce the air to a foot, and the upper stream of the first layer 23 is closed during the humidification/heating period so that the dehumidified outside air passed from an outside air introducing duct 5 through the exterior heat exchanger 3 is introduced into the first layer 23. Therefore, the dehumidified outside air is jet from the differential and the face so as to dehumidify/ heat the inside of the car room without providing a heat exchanger for dehumidification in the air conditioning duct 7.

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 capable of preventing fogging of window glass of a vehicle. Especially for electric vehicle air conditioners that require power to generate heat for heating, or hot water heaters that use engine cooling water for air conditioners for diesel vehicles and lean burn engine vehicles that have high engine thermal efficiency and low hot water temperature. It is suitable.

[0002]

2. Description of the Related Art As an air conditioner having a dehumidifying function for preventing fogging of window glass, an indoor upstream heat exchanger that operates as an evaporator at the time of dehumidification is provided upstream of an air conditioning duct that blows air into the vehicle interior. There is known a technique in which an indoor downstream heat exchanger that operates as a condenser at the time of dehumidification is provided downstream of the above. This air conditioner sucks outdoor air (outside air) into the air conditioning duct during dehumidification, cools and dehumidifies the air flowing in the air conditioning duct by the indoor upstream heat exchanger,
After that, the dehumidified air is heated by the indoor downstream heat exchanger and blown to the foot outlet and the defroster outlet to reduce the humidity in the vehicle compartment and prevent the window glass from fogging.

This air conditioner is provided with an outdoor heat exchanger which is arranged outdoors to exchange heat with the outside air and operates as an evaporator during heating operation. During heating operation, the indoor upstream heat exchanger and indoor downstream heat exchanger are provided. Both or one of the exchangers is operated as a condenser to heat the room.

[0004]

In an internal combustion engine vehicle, there is a strong demand for keeping the energy consumption of the air conditioner low due to the improvement of fuel consumption and the recent increasing awareness of global environment conservation. In addition, in the electric vehicle, there is an even higher demand for suppressing the power consumption of the air conditioner from the requirement of extending the running distance per charge.

However, in the above technique, the refrigerant compressor of the refrigeration cycle needs to drive the refrigerant flowing through the three heat exchangers of the indoor upstream heat exchanger, the indoor downstream heat exchanger, and the outdoor heat exchanger. Therefore, there is a problem that the load on the refrigerant compressor is large and the energy applied to the refrigerant compressor is large. Further, since the air flowing through the air conditioning duct passes through the indoor upstream heat exchanger and the indoor downstream heat exchanger, there is also a problem that ventilation resistance in the air conditioning duct increases and power consumption of the blower increases.

Further, since the refrigeration cycle is equipped with three heat exchangers, an indoor upstream heat exchanger, an indoor downstream heat exchanger, and an outdoor heat exchanger, the cost of the air conditioner increases and the air conditioner becomes expensive. This weight becomes large. In addition, there is a problem that the handling of the refrigerant pipe is complicated.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. An object of the present invention is to remove outside air without providing a heat exchanger for dehumidifying air in an air conditioning duct for blowing air into the passenger compartment. (EN) Provided is a vehicle air conditioner which can be dehumidified and blown into a vehicle interior.

[0008]

[Means for Solving the Problems]

[Claim 1] The vehicle air conditioner according to claim 1 has a refrigeration cycle in which an outdoor heat exchanger for exchanging heat with air outside the vehicle compartment can operate as an evaporator, and an outdoor heat exchanger when operating as an evaporator. And an external air introducing duct capable of guiding the air passing through the outdoor heat exchanger into the vehicle compartment.

According to a second aspect of the present invention, an air conditioning apparatus for a vehicle according to the first aspect is provided with an air conditioning duct for blowing air toward a passenger compartment, and an air conditioning duct arranged in the duct to heat the air blown into the passenger compartment. And an indoor heat exchanger of the refrigeration cycle operable as a condenser. Then, the outside air introduction duct is connected to the air conditioning duct, the air that has passed through the outdoor heat exchanger that operates as an evaporator,
The technical means provided so as to be blown into the vehicle interior through the outside air introduction duct and the air conditioning duct is adopted.

[Claim 3] The air-conditioning duct of the vehicle air conditioner according to claim 2 has a face outlet for blowing air toward the upper half of the occupant and a defroster outlet for blowing air toward the windshield. And a first layer that is provided with a foot outlet that blows air toward the feet of an occupant, passes through the indoor heat exchanger, and is guided to the face outlet and the defroster outlet, and the indoor heat exchanger. And a second layer that is guided to the foot air outlet. The outside air introduction duct is connected to the first layer upstream of the indoor heat exchanger, and the air that has passed through the outdoor heat exchanger that operates as an evaporator is discharged from the face outlet or the defroster outlet. Adopt technical means that can be blown out.

[Claim 4] The first layer of the vehicle air conditioner according to claim 3 is a first layer opening / closing door that opens and closes the first layer upstream of a connection point with the outside air introducing duct. Equipped with. Then, during the heating operation or the dehumidifying heating operation in which the indoor heat exchanger operates as a condenser, the first layer opening / closing door is closed, and the air that has passed through the outdoor heat exchanger that operates as an evaporator is transferred to the face outlet or The technical means is adopted in which the air blown from the defroster outlet, passed through the second layer, and passed through the indoor heat exchanger to be heated is blown out through the foot outlet.

[0012]

The outdoor heat exchanger is operated as an evaporator. Then, the outside air passing through the outdoor heat exchanger is cooled and dehumidified. Then, the dehumidified outside air is introduced into the vehicle compartment through the outside air introduction duct to suppress the humidity in the vehicle compartment and prevent the window glass from fogging. In particular, by introducing the dehumidified outside air introduced from the outside air introduction duct to the window glass,
It is possible to efficiently suppress the fogging of the window glass.

[0013]

As described above, the vehicle air conditioner of the present invention uses the outdoor heat exchanger as a heat exchanger for dehumidifying the outside air. There is no need to provide a heat exchanger for dehumidification.

Therefore, for example, as shown in the prior art, it is possible to suppress the fogging of the window glass without providing a heat exchanger for dehumidifying the air in the air conditioning duct for blowing the air into the passenger compartment.

In order to perform the dehumidifying and heating operation, it is necessary to drive the refrigerant flowing through the three heat exchangers of the indoor upstream heat exchanger, the indoor downstream heat exchanger, and the outdoor heat exchanger, as shown in the prior art. There is no need to drive the refrigerant flowing through two heat exchangers, an outdoor heat exchanger that operates as an evaporator and a heat exchanger that operates as a condenser (for example, an indoor heat exchanger). The load on the refrigerant compressor is reduced. As a result, the energy consumption of the refrigerant compressor can be reduced.

Since dehumidification is performed by the air that has passed through the outdoor heat exchanger, it is not necessary to dispose a heat exchanger for dehumidification in, for example, the air conditioning duct, and the ventilation resistance of the air conditioning duct can be reduced. . Therefore, it is possible to suppress the power consumption of the blower that causes the air flow in the air conditioning duct to be small.

Further, since the refrigeration cycle requires only two heat exchangers, an outdoor heat exchanger that operates as an evaporator and a heat exchanger (for example, an indoor heat exchanger) that operates as a condenser, the cost of the air conditioner is low. Can be kept low, and the weight of the air conditioner can be reduced. Further, there is an effect that the handling of the refrigerant pipe can be simplified.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in the drawings. [Structure of Embodiments] FIGS. 1 to 3 show an embodiment in which claims 1 to 4 are adopted. FIG. 1 is a schematic structure diagram of a duct of an air conditioner, and FIG. 2 is a heat pump type refrigeration cycle. It is a refrigerant circuit diagram. (Explanation of Outdoor Heat Exchanger) The vehicle air conditioner 1 of this embodiment is installed in, for example, an electric vehicle, and is placed outside the heat pump type refrigeration cycle 2 at a position where the vehicle receives traveling wind when the vehicle travels. The heat exchanger 3 is arranged.

The outdoor heat exchanger 3 is arranged outside the vehicle compartment and exchanges heat between the outside air forcibly exchanged with heat by the outdoor fan 4 and the refrigerant flowing inside, and serves as a condenser during cooling operation. It operates and operates as an evaporator during heating operation and dehumidifying heating operation.

The outdoor heat exchanger 3 is connected to an outdoor air introducing duct 5 for guiding the air passing through the outdoor heat exchanger 3 into the vehicle compartment during the dehumidifying and heating operation in which the outdoor heat exchanger 3 operates as an evaporator. The outdoor air introducing duct 5 guides the air passing through the outdoor heat exchanger 3 into the vehicle interior by the air flow generated by the outdoor fan 4, and as shown in FIG.
The fan shroud 6 of one of the two outdoor fans 4 is provided with an outside air introduction duct 5 that guides the air that has passed through the outdoor heat exchanger 3 into the vehicle interior (configuration according to claim 1). . As described above, since the outdoor heat exchanger 3 is arranged at a position to receive the traveling wind, the air that has passed through the outdoor heat exchanger 3 due to the traveling wind of the vehicle even if the outdoor fan 4 does not operate. Are introduced into the vehicle compartment through the outside air introduction duct 5. The outside air introduction duct 5 is connected to an air conditioning duct 7 that blows out conditioned air toward the passenger compartment (configuration according to claim 2).

(Explanation of the air conditioning duct 7)
A duct that forms an air passage for sending air toward the room. At one end of the air conditioning duct 7, a blower 8 driven by an electric motor that creates an air flow toward the room in the air conditioning duct 7.
Are connected. The blower 8 is provided only with the inside air introduction port 9 for sucking the air (inside air) inside the vehicle.

At the other end of the air conditioning duct 7, there is formed an air outlet for blowing the air passing through the air conditioning duct 7 toward each part in the room. This outlet is from the center of the front of the room,
Center face outlet 10 that mainly blows cool air toward the upper body of the occupant, and side face outlets 11 that mainly blows cool air toward the upper body of the occupant or the side glass from both sides of the front of the room, and toward the windshield The defroster outlet 12 mainly blows warm air, and the foot outlet 13 mainly blows warm air toward the feet of the occupant.
Then, in the air conditioning duct 7, the side face outlet 1
A center face door 14, a defroster door 15, and a foot door 16 that control the air flow to each of the air outlets are provided in the air passages that communicate with the other air outlets except 1.

An indoor heat exchanger 20 for cooling or heating the air flowing in the air conditioning duct 7 is arranged in the air conditioning duct 7. The indoor heat exchanger 20 is a component of the heat pump refrigeration cycle 2, and operates as an evaporator during cooling operation and as a condenser during heating operation. A bypass passage 21 that bypasses the indoor heat exchanger 20 is provided in the air conditioning duct 7. The bypass passage 21 is provided with a cool door 22 that opens and closes the bypass passage 21 and changes the opening degree of the bypass passage 21.

The indoor heat exchanger 20 in the air conditioning duct 7
Upstream and downstream of the first layer 23 that guides the air that has passed through the indoor heat exchanger 20 or the air that has passed through the bypass passage 21 to the center face outlet 10, the side face outlet 11, and the defroster outlet 12; Heat exchanger 20
A partition wall 25 is provided to divide the air passing through the second layer 24 into the foot outlet 13. And
The indoor heat exchanger 20 and the bypass passage 21 of the first layer 23
Is connected to the outside air introduction duct 5 so that the outside air passing through the outdoor heat exchanger 3 is blown out to the center face outlet 10, the side face outlet 11, and the defroster outlet 12 through the first layer 23. (The structure according to claim 3).

The outside air introduction duct 5 is formed with a discharge port 26 through which the outside air introduced into the outside air introduction duct 5 is discharged to the outside of the vehicle compartment. The exhaust port 26 or the outside air introducing duct 5 is provided at the downstream portion of the outside air introducing duct 5.
An outside air switching door 27 that closes the downstream side of is provided. The outside air switching door 27 allows the outside air to enter the air conditioning duct 7 (inside the passenger compartment).
In the mode in which the air is not guided to the exhaust port 26 (in the present embodiment, it is during the cooling operation and the heating operation, but it may be provided so that part of the outside air is introduced into the vehicle interior during the heating operation to prevent fogging).
To close the downstream side of the outside air introduction duct 5,
It is provided so as to prevent the outside air from being introduced therein. In addition, by changing the opening degree of the outside air switching door 27, the required ratio of dehumidification (for example, the number of passengers, the set value of the user, etc.)
According to the above, it may be provided so as to adjust the amount of outside air introduced into the vehicle compartment.

On the other hand, the first layer 23 is provided with a first layer opening / closing door 28 for opening / closing the first layer 23 upstream of the connection point with the outside air introducing duct 5. The first layer opening / closing door 28 closes the upstream of the first layer 23 during the heating / dehumidifying operation, and blows air through the first layer 23 to the center face outlet 10, the side face outlet 11, and the defroster outlet 12. But,
Only the air that has passed through the outdoor heat exchanger 3 is used (the configuration according to claim 4). The first layer opening / closing door 28
Of the inside air passing through the first layer 23 and the outside air introduced from the outside air introduction duct 5 in accordance with the dehumidification request ratio (for example, the number of occupants, the set value of the user, etc.). You may provide so that the ratio of may be adjusted.

The indoor heat exchanger 20 is arranged in the air conditioning duct 7 while penetrating the partition wall 25. Further, a communication port 29 for communicating the first layer 23 and the second layer 24 in the face mode and the defroster mode is provided downstream of the partition wall 25. The communication port 29 is provided with a communication door 30 that opens and closes the communication port 29. When the face mode or the defroster mode is selected, the communication door 30 opens the communication port 29.

The outdoor heat exchanger 3 and the indoor heat exchanger 20
2 is a component of the heat pump refrigeration cycle 2 as described above, and an example of the refrigeration cycle 2 used in this embodiment is shown in the refrigerant circuit diagram of FIG. The refrigeration cycle 2 of the present embodiment is an accumulator cycle, and in addition to the outdoor heat exchanger 3 and the indoor heat exchanger 20, a refrigerant compressor 31, a cooling decompression device 32, a heating decompression device 33, an accumulator 3 are provided.
4, and the flow path switching means 3 for switching the flow direction of the refrigerant
5 is provided.

The refrigerant compressor 31 sucks, compresses and discharges the refrigerant, and is driven by an electric motor (not shown). The refrigerant compressor 31 is arranged inside the sealed case integrally with the electric motor. The rotation speed of the electric motor that drives the refrigerant compressor 31 is changed by control by an inverter (not shown), and the refrigerant discharge capacity of the refrigerant compressor 31 changes. The outlet temperature is controlled by changing the capacity of the refrigerant compressor 31 by changing the rotation speed of the refrigerant compressor 31 with the inverter.

The cooling decompression device 32 is an expansion valve that decompresses and expands the refrigerant flowing into the indoor heat exchanger 20 during the cooling operation. The heating decompression device 33 is an expansion valve that decompresses and expands the refrigerant flowing into the outdoor heat exchanger 3 during the heating operation and the dehumidifying and heating operation. For example, the indoor heat exchanger 20 during the dehumidifying and heating operation.
It is provided to adjust the amount of super cool.

The refrigerant flow path switching means 35 switches the flow direction of the refrigerant in the cooling operation, the heating operation, and the dehumidifying and heating operation. As shown in FIG. 2, the discharge direction of the refrigerant compressor 31 is changed to indoor heat exchange. A four-way valve 36 for switching between the device 20 or the outdoor heat exchanger 3, a bypass refrigerant pipe 37, a plurality of electromagnetic opening / closing valves 38, and a plurality of check valves 39.

Then, the flow path switching means 35 switches the flow of the refrigerant as follows according to the cooling operation, the heating operation and the dehumidifying heating operation. During the cooling operation, the refrigerant discharged from the refrigerant compressor 31 is discharged from the four-way valve 36 to the outdoor heat exchanger 3
→ Cooling decompression device 32 → Indoor heat exchanger 20 → Four-way valve 36
The flow is made in the order of the accumulator 34 and the refrigerant compressor 31 (see arrow C in the figure). During the heating operation, the refrigerant discharged from the refrigerant compressor 31 is transferred in the order of the four-way valve 36, the indoor heat exchanger 20, the heating decompression device 33, the outdoor heat exchanger 3, the four-way valve 36, the accumulator 34, and the refrigerant compressor 31. Flow (see arrow H in the figure). During the dehumidifying heating operation, the refrigerant discharged from the refrigerant compressor 31 is transferred to the four-way valve 36 → the indoor heat exchanger 2 as in the heating operation.
0 → decompression device for heating 33 → outdoor heat exchanger 3 → four-way valve 36
The flow is made in the order of the accumulator 34 and the refrigerant compressor 31 (see arrow D in the figure).

The outdoor fan 4, the blower 8, the inverter of the electric motor, the four-way valve 36, each electromagnetic opening / closing valve 38, the actuator (not shown) for driving the outside air switching door 27, and the actuator for driving the first layer opening / closing door 28. Electric components such as (not shown) are controlled by the control device 40.

The control device 40 controls energization of each electric component in accordance with an operation signal of an operation panel 41 (see FIG. 3) operated by an occupant, and the operation panel 41 is located at a position where operability is good in a room. Is installed. Operation panel 41
Is a blowout mode switch 42 for setting each blowout mode, an air volume setting switch 43 for setting the amount of air blown into the room from the air conditioning duct 7, a cooling / heating switch 44 for instructing start and stop of the refrigeration cycle 2, and a dehumidification instruction. A dehumidifying switch 45 for giving and a temperature adjusting lever 46 for adjusting the temperature of air blown into the vehicle compartment are provided.

The blow-out mode switch 42 is a face mode switch 47 for discharging the air in the air conditioning duct 7 toward the upper body of the occupant, relatively cool air to the upper body of the occupant, and relatively warm air to the feet of the occupant. A bi-level mode switch 48 for ejecting, a foot mode switch 49 for ejecting relatively warm air mainly to the occupant's feet,
It mainly comprises a differential mode switch 50 for discharging relatively warm air to the windshield. Further, the cooling / heating switch 44 turns on / off the refrigerant compressor 31 of the refrigeration cycle 2. When both the cooling / heating switch 44 and the face mode switch 47 are turned on, the refrigeration cycle 2 performs cooling operation, and Bi-level mode switch 48, foot mode switch 49 and differential mode switch 50
The refrigeration cycle 2 is provided so as to perform the heating operation when any one of the above and the cooling / heating switch 44 are turned on.

The temperature adjusting lever 46 sets the rotational speed of the refrigerant compressor 31 in accordance with the set position.
For example, as the temperature control lever 46 is moved to the cool side during the cooling operation, the rotation of the refrigerant compressor 31 becomes faster and the cooling capacity of the air passing through the indoor heat exchanger 20 that operates as an evaporator is continuously increased. is there. Conversely, as the temperature control lever 46 is moved to the hot side during the heating operation, the rotation of the refrigerant compressor 31 becomes faster, and the heating capacity of the air passing through the indoor heat exchanger 20 that operates as a condenser is continuously increased. is there. In addition, as the temperature control lever 46 is moved to the hot side during the dehumidification heating operation, the rotation of the refrigerant compressor 31 becomes faster, and the heating capacity of the air passing through the indoor heat exchanger 20 that operates as a condenser is continuously increased. Adjust the heating capacity during dehumidification.

[Operation of Embodiment] Next, the operation of the above embodiment will be described. (Cooling operation) When the occupant turns on the face mode switch 47 and the cooling / heating switch 44 of the operation panel 41, turns on the air volume setting switch 43, and sets the temperature adjusting lever 46 to the cool side, the refrigeration cycle 2 starts the cooling operation. At the same time, the outside air switching door 27 closes the outside air introduction duct 5,
The blower 8 operates while the first layer opening / closing door 28 is open upstream of the first layer 23. Then, the outdoor heat exchanger 3 operates as a condenser, and the indoor heat exchanger 20 operates as an evaporator. In this mode, the cool door 22 is closed, and all the inside air sent by the blower 8 into the air conditioning duct 7 passes through the indoor heat exchanger 20 and is cooled, mainly from the center face outlet 10 and the side face outlet 11, It is blown out into the passenger compartment. In this mode, since the exhaust port 26 is opened by the outside air switching door 27 and the downstream side of the outside air introduction duct 5 is closed, the warm outside air that has passed through the outdoor heat exchanger 3 that operates as a condenser enters the inside of the air conditioning duct 7. Is not guided.

(Heating operation) An occupant turns on any one of the bi-level mode switch 48, the foot mode switch 49 and the diff mode switch 50 of the operation panel 41 and both the cooling and heating switch 44, and the air volume setting switch 4
3 is turned on and the temperature control lever 46 is set to the hot side, the refrigeration cycle 2 performs the heating operation, the outside air switching door 27 closes the outside air introduction duct 5, and the first layer opening / closing door 28 opens the first layer. The blower 8 operates with the upstream side of 23 open. Then, the outdoor heat exchanger 3 operates as an evaporator, and the indoor heat exchanger 20 operates as a condenser. Even in this mode, the cool door 22 is closed except in the bi-level mode, and all the inside air sent by the blower 8 into the air conditioning duct 7 is heated through the indoor heat exchanger 20, and mainly from the foot outlet 13 and the defroster outlet 12. Hot air is blown out.

In the bilevel mode, the degree of heating of the air flowing through the first layer 23 can be reduced by opening the cool door 22. At this time, by increasing the opening degree of the outside air introduction duct 5, the temperature difference between the upper and lower sides can be adjusted significantly. Further, during this heating operation, the opening degree of the outside air introduction duct 5 is opened, and a part of the dehumidified air that has passed through the outdoor heat exchanger 3 that operates as an evaporator is introduced into the air conditioning duct 7 so that the window glass becomes cloudy. You may provide so that heating operation may be suppressed and suppressed.

(Dehumidifying and Heating Operation) During the heating operation, when the dehumidifying switch 45 is turned on, the outside air switching door 27 closes the discharge port 26 and opens the outside air introducing duct 5, so that the outside air that operates as an evaporator is operated. The dehumidified outside air that has passed through the heat exchanger 3 receives the first air from the air conditioning duct 7.
Guided into layer 23. At this time, the upstream of the first layer 23 is closed by the first layer opening / closing door 28, and the introduction of the inside air into the first layer 23 is blocked. As a result, only the dehumidified outside air that has passed through the outdoor heat exchanger 3 that operates as an evaporator is guided to the first layer 23. The dehumidified outside air passing through the first layer 23 is reheated by the indoor heat exchanger 20 that operates as a condenser, and becomes warm outside air with extremely low humidity, and is blown out from the side face outlet 11 and the defroster outlet 12. Prevents fogging of the windshield and side windows.

[Effects of Embodiment] In the air conditioner 1 of this embodiment, since the outdoor heat exchanger 3 that operates as an evaporator during heating operation is used as a heat exchanger that dehumidifies the outside air, the air conditioning duct 7 is used. It is not necessary to provide a heat exchanger therein to dehumidify the air during heating operation. For this reason, as shown in the prior art, even if the heat exchanger for dehumidifying the air and the heat exchanger for reheating the dehumidified air are not provided in the air conditioning duct 7, the window glass The cloudiness of can be suppressed.

In order to perform dehumidifying and heating operation, there are three heat exchangers: a heat exchanger for dehumidifying air, a heat exchanger for reheating dehumidified air, and an outdoor heat exchanger 3. It is not necessary for the refrigerant compressor 31 to drive the refrigerant flowing through
The outdoor heat exchanger 3 operating as an evaporator and the heat exchanger operating as a condenser (for example, the indoor heat exchanger 2
0) and the refrigerant flowing through the two heat exchangers to the refrigerant compressor 31
Need only be driven.
The load on the can be reduced. As a result, the refrigerant compressor 3
The energy consumption of 1 can be suppressed to be small.

Further, in order to perform the dehumidifying and heating operation, two heat exchangers, a heat exchanger for dehumidifying the air and a heat exchanger for reheating the dehumidified air, are provided in the air conditioning duct 7. Even if it is not provided, dehumidifying and heating can be performed by providing only one indoor heat exchanger 20 in the air conditioning duct 7, so the ventilation resistance of the air conditioning duct 7 becomes small. Therefore, it is possible to reduce the power consumption of the blower 8 that causes an air flow in the air conditioning duct 7.

Since the refrigeration cycle 2 needs only two heat exchangers, the outdoor heat exchanger 3 which operates as an evaporator and the indoor heat exchanger 20 which operates as a condenser, the cost of the air conditioner 1 can be kept low. You can Further, since the weight applied to the air conditioner 1 is reduced and only two heat exchangers are needed, the handling of the refrigerant pipe can be simplified.

Further, conventionally, during the dehumidifying and heating operation, the air cooled for dehumidification at the upstream side is reheated at the downstream side, so it is difficult to maintain the temperature of the air blown at the feet high. However, in this embodiment, since the inside air is reheated and blown to the feet, the temperature of the air blown to the feet can be kept high. Therefore, the blowout temperature during the dehumidifying and heating operation can be controlled more easily than in the related art.

Since the dehumidified outside air is blown out from the side face outlet 11 during the heating and dehumidifying operation, the side glass is prevented from fogging and the visibility of the door mirror is excellent. Further, like the side face outlet 11, the center face outlet 10 communicates with the first layer 23, so that fresh outside air can be blown out from the center face outlet 10 and the side face outlet 11 to the upper body of the occupant. Thus, it is possible to give the occupant a fresh feeling and improve the comfort of the occupant.

During the cooling operation, since the inside air having a relatively low temperature in the room is sucked and cooled, the cooling load can be kept small. Further, even during the heating operation, since the inside air having a relatively high temperature in the room is sucked and heated, the heating load can be suppressed. Furthermore, during the dehumidifying and heating operation, the warm air blown to the feet sucks and heats warm inner air, so that the heating load on the dehumidifying and heating can be suppressed low. As a result, the vehicle air conditioner 1 of this embodiment is suitable for an electric vehicle that generates almost no excess heat.

[Modification] In this embodiment, the air conditioner is mounted on an electric vehicle. However, the air conditioner may be mounted on an automobile driven by an internal combustion engine, particularly a diesel engine or a lean burn engine. The air conditioner duct blower
The inside / outside air switching means may be provided so that the outside air can be introduced only into the first layer or into the second layer, for example.

Although the example in which the air conditioning duct is divided into the first layer and the second layer is shown, the outside air introducing duct may be connected to the air conditioning duct which is not divided into two layers. An example was shown in which the outside air introduction duct was connected in the middle of the air conditioning duct, but at the air introduction port of the blower,
It may be provided so that the air that has passed through the outside air introduction duct is introduced. Although the example in which the outside air introducing duct is connected to the air conditioning duct is shown, it may be provided so as to blow out into the vehicle interior (preferably window glass) independently of the air conditioning duct.

As an example of the heat exchanger that operates as a condenser when the outdoor heat exchanger operates as an evaporator, an example in which the heat exchanger is arranged in an air conditioning duct has been shown.
For example, it may be applied to a vehicle that uses a condenser of a refrigerating cycle as a heat source of a warm storage that keeps the inside of the heat insulation at a high temperature. That is, even if there is no heat exchanger that operates as a condenser in the vehicle compartment, in a vehicle that is equipped with an outdoor heat exchanger that operates as an evaporator, the outside air that passes through the outdoor heat exchanger that operates as an evaporator should be introduced into the vehicle interior. It may be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a duct of an air conditioner.

FIG. 2 is a refrigerant circuit diagram of a refrigeration cycle.

FIG. 3 is a front view of an operation panel.

[Explanation of symbols]

 1 Vehicle Air Conditioner 2 Refrigeration Cycle 3 Outdoor Heat Exchanger 5 Outdoor Air Inducting Duct 7 Air Conditioning Duct 10 Center Face Outlet 11 Side Face Outlet 12 Defroster Outlet 13 Foot Outlet 20 Indoor Heat Exchanger 23 First Layer 24th 2nd layer 28 1st layer open / close door

Claims (4)

[Claims] 1. A refrigeration cycle in which an outdoor heat exchanger for exchanging heat with the air outside a vehicle is operable as an evaporator, and when the outdoor heat exchanger is operated as an evaporator,
An air conditioner for a vehicle, comprising: an outside air introduction duct capable of guiding the air that has passed through the outdoor heat exchanger into the vehicle interior. 2. An air conditioner for a vehicle according to claim 1, wherein the air conditioning duct blows air toward the passenger compartment, and the air conditioner operates as a condenser arranged in the duct to heat the air blown into the passenger compartment. An indoor heat exchanger of the possible refrigeration cycle, the outside air introduction duct is connected to the air conditioning duct, the air that has passed through the outdoor heat exchanger that operates as an evaporator, the outside air introduction duct and the air conditioning duct An air conditioner for a vehicle, wherein the air conditioner for a vehicle is provided so as to be blown into the vehicle interior via the. 3. The air conditioning duct according to claim 2, wherein a face outlet for blowing air toward the upper body of the occupant, a defroster outlet for blowing air toward the windshield, and air toward the feet of the occupant. A first layer that is provided with a foot outlet that blows out, passes through the indoor heat exchanger and is guided to the face outlet and the defroster outlet, and passes through the indoor heat exchanger and is guided to the foot outlet. The air is introduced separately from the second layer, and the outside air introduction duct is connected to the first layer upstream of the indoor heat exchanger, and the air that has passed through the outdoor heat exchanger that operates as an evaporator is An air conditioner for a vehicle, which is provided so as to be blown from a face outlet or the defroster outlet. 4. The first layer according to claim 3, further comprising a first layer opening / closing door for opening / closing the first layer upstream of a connection point with the outside air introducing duct, wherein the indoor heat exchanger is a condenser. During the heating operation or the dehumidifying heating operation, the air that has passed through the outdoor heat exchanger that operates as an evaporator is blown from the face outlet or the defroster outlet, and the first layer opening / closing door is closed. The air conditioner for a vehicle, wherein the air that has passed through two layers and has passed through the indoor heat exchanger and is heated is blown out from the foot outlet.