JP2003291625A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for vehicles having sufficient dehumidifying and heating performance without applying excessive load to a compressor in a very cold atmospheric environment. <P>SOLUTION: The air conditioner for vehicles comprises a unit case 11, in which an in-cabin air passage 12 is formed, including an in-cabin heat exchanger 34 for heat radiation, in-cabin heat exchanger 36 for heat absorption, outside air inlet port 13a, inside air inlet port 13b, floor fan 15, heating passage 18 communicating with the in-cabin heat exchanger 34, heating by-pass passage 18a by-passing the in-cabin heat exchanger 34, and air mix door 19 for switching the air passage of the heating passage 18 and the heating by-pass passage 18a. The air conditioner is also provided with an evaporation blast passage 16 through which the outside air introduced in the in-cabin air passage 12 is sent to the in-cabin heat exchanger 36 for heat absorption and an air by-pass passage 16a which the outside air introduced in the in-cabin air passage 12 by-passes the in-cabin heat exchanger 36, and the air by-pass passage 16a is equipped with a counter flow preventive means 17 for preventing air conditioned wind from counter-flowing. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for adjusting the temperature environment inside a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner 1, as shown in FIG. 4, a heater core 3 in which engine cooling water circulates in a vehicle interior air flow path 2, a sub condenser 4 in which a refrigerant circulates, and an evaporator 5 are provided. And a compressor 6 are provided.

At the time of cooling operation, the air-conditioning air flows through the evaporator 5
It is cooled and dehumidified by and is blown into the passenger compartment.

During the heating operation, the conditioned air is cooled and dehumidified by the evaporator 5 and then heated by the sub-condenser 4 and the heater core 3, and the dehumidified and heated conditioned air is blown into the passenger compartment.

The dehumidified / heated low-humidity air-conditioned air is blown into the inside of the window to effectively remove the fogging of the window.

[0006]

However, when the vehicle is placed in an environment of extremely low temperature outside air, even if the inside air is circulated while being dehumidified and heated by the vehicle air conditioner 1 in the above-mentioned conventional technique. When the outside air temperature becomes lower than the inside air cooled and dehumidified by the evaporator 5, dew condensation occurs on the inner surface of the window, resulting in fogging of the window.

Therefore, conventionally, outside air of extremely low temperature and low humidity is introduced into the air conditioner in order to prevent the window fogging, but since the temperature of the introduced outside air is too low, the refrigerant inside the evaporator 5 is cooled. Cannot absorb the heat and condense, which hinders the rise of the refrigerant pressure.

As a result, the compressor 6 for compressing the refrigerant is overloaded and causes a failure of the compressor 6.

Therefore, an object of the present invention is to provide a vehicle air conditioner having sufficient dehumidifying and heating performance without exerting an excessive load on the compressor even in an extremely low temperature outside air environment.

[0010]

The invention according to claim 1 is
In order to solve the above problems, a refrigeration cycle mounted in a vehicle, in which a refrigerant circulates, and a unit case in which a vehicle interior air flow path through which conditioned air is blown are formed are included in the refrigeration cycle. A compressor for compressing the introduced refrigerant, and a heat absorbing vehicle interior heat exchanger for dehumidifying and cooling the conditioned air by transmitting heat of the conditioned air to the introduced refrigerant disposed in the vehicle interior air flow path And a heat radiating passenger compartment heat exchanger that heats the conditioned air by transmitting the heat of the refrigerant, which is arranged downstream of the heat absorbing passenger compartment heat exchanger of the passenger compartment air flow path, to the conditioned air And a blower fan for introducing conditioned air into the vehicle interior air flow path, an outside air introduction port for introducing air outside the vehicle compartment, an inside air introduction port for introducing air inside the vehicle interior, and the unit case. A vehicle air conditioner comprising: An air ventilation path through which the outside air introduced into the air flow path is blown to the endothermic vehicle interior heat exchanger, and an external air introduced into the inside air path of the vehicle interior bypasses the endothermic vehicle interior heat exchanger. It is characterized in that a bypass passage and a backflow preventing means for preventing a backflow of the conditioned air are provided in the EVA bypass passage.

In order to solve the above-mentioned problems, a second aspect of the present invention provides the vehicle air-conditioning system according to the first aspect, wherein the backflow preventing means is provided with the air-flow ventilation passage communicating with the heat-absorbing vehicle interior heat exchanger. It is characterized by being an EVA switching door for switching between the EVA bypass path.

[0012] In order to solve the above-mentioned problems, a third aspect of the present invention provides the vehicle air conditioner according to the first aspect, wherein the backflow preventing means is a check valve, and the unit case is provided with air outside the vehicle compartment. Is provided and an auxiliary outside air introduction port communicating with the evaporation bypass passage is provided.

In order to solve the above-mentioned problems, the invention according to claim 4 is the vehicle air conditioner according to claim 3, wherein an auxiliary blower for introducing conditioned air into the vehicle interior air flow path through the auxiliary outside air introduction port. It is characterized by having a fan.

According to a fifth aspect of the present invention, in order to solve the above-mentioned problems, in the vehicle air conditioner according to the third aspect, the blower fan is provided with a partitioning portion for blocking between the air blow passage and the air bypass passage. It is characterized by being provided.

[0015]

According to the first aspect of the present invention, in the dehumidifying and heating operation under the extremely low temperature outside air environment, the low temperature outside air bypasses the heat absorbing vehicle interior heat exchanger and is sent to the heat radiating vehicle interior heat exchanger. By entering, it is possible to blow low-humidity heating air into the passenger compartment, and the inside air is cooled and dehumidified by the heat-absorbing passenger compartment heat exchanger before being sent to the heat-releasing passenger compartment heat exchanger. As a result, the refrigerant absorbs the heat of the inside air in the heat absorption vehicle interior heat exchanger,
The refrigerant pressure can be stabilized.

As a result, the compressor inlet pressure is not extremely lowered, so that sufficient dehumidifying and heating performance can be ensured without imposing an excessive load on the compressor even in a cryogenic environment.

According to the second aspect of the present invention, in addition to the effect of the first aspect, since the EVA switching door has the function of a check valve, an increase in the number of parts can be prevented and the manufacturing cost can be reduced. .

According to the invention described in claim 3, in addition to the effect of claim 1, since the check valve does not require a control means to function, an increase in the number of parts is prevented and an increase in manufacturing cost. Can be prevented.

According to the invention of claim 4, claim 1
In addition to the effect of 3, the provision of the auxiliary blower fan makes it possible to control the introduction ratio of the outside air and the inside air with high accuracy, and further prevent fogging of the window and reduce the load on the compressor.

According to the invention of claim 5, claim 1
In addition to the effect of 3, by providing a partition inside the blower fan, the outside air introduced into the unit case in the inside / outside air mixing operation state does not mix with the inside of the blower fan. Since the air is blown to the air blowing passage and the outside air is blown to the air bypass passage, it is possible to further prevent the window fogging and reduce the load on the compressor without increasing the manufacturing cost.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a vehicle air conditioner 10 according to the present invention.
It is a system configuration diagram showing a configuration of the first embodiment of.

This vehicle air conditioner 10 can be divided into a heat pump type refrigeration cycle 30, a hot water line 40 for circulating engine cooling water, and a vehicle interior air flow path 12 for adjusting the temperature of conditioned air.

The refrigeration cycle 30 includes a compressor 31 for compressing a refrigerant, and a main condenser 33 arranged outside the vehicle compartment as a heat exchanger for discharging heat of the refrigerant to the outside air.
And a sub-condenser 34 arranged in the vehicle interior air flow path 12 as a heat radiating vehicle interior heat exchanger that releases the heat of the refrigerant to the blown air, and an expansion valve 3 that expands the refrigerant.
5 and an evaporator 36 as a heat absorbing vehicle interior heat exchanger that transfers the heat of blown air to the expanded refrigerant.

In the refrigeration cycle 30, the refrigerant line 38 downstream of the compressor 31 is connected to the first refrigerant line 38a leading to the main condenser 33, and the main condenser 3 is connected.
3 is bypassed to a second refrigerant line 38b, and a switching valve 32 for selectively switching between the first refrigerant line 38a and the second refrigerant line 38b is disposed at this branch portion, and The flow is switched as needed.

Further, since the first refrigerant line 38a and the second refrigerant line 38b are joined at the joining portion 37 having a check valve, the refrigerants passing through the respective refrigerant lines 38a and 38b are brought into the mutual lines. There is no inflow.

An expansion valve 35 is provided downstream of the confluence portion 37, and an evaporator 36 is arranged downstream of the expansion valve 35 in the vehicle interior air flow passage 12.

The downstream side of the evaporator 36 communicates with the compressor 31.

The hot water line 40 is arranged so that engine cooling water can circulate inside the heater core 41.

In the vehicle interior air flow passage 12 arranged in the vehicle compartment, an outside air inlet 13a, an inside air inlet 13b, and inside / outside air switching doors 14a, 14b for selectively switching between outside air and inside air.
The blower fan 15 that introduces the outside air and the inside air into the vehicle interior air flow path 12, and the introduced conditioned air is the evaporator 3
6 and an evaporator bypass passage 16a through which the introduced conditioned air bypasses the evaporator 36.
And an air switching door 17 that selectively switches between the air blowing path 16 and the air bypass path 16a, and the air-conditioning air flows through the heater core 41.
And the heating passage 18 fed into the sub-condenser 34, the heating bypass passage 18a bypassing the heater core 41 and the sub-condenser 34, the heating passage 18 and the heating bypass passage 18a.
An air mix door 19 for selectively switching between and is provided.

-Inside Air Circulation Operation- As shown in FIG. 1 (a), in the case of the inside air circulation operation, the inside / outside air switching door 14b is opened to introduce the inside air into the vehicle interior air flow path 12, and the inside / outside air is switched. The door 14a is closed to shut off the outside air.

During the cooling operation, the air bypass passage 16a is fully closed by the air switching door 17, while the air ventilation passage 16 is fully opened. Further, the air mixing door 19 is used to heat the heating path
Is fully closed, and the heating bypass passage 18a is fully opened.

All the conditioned air introduced into the vehicle interior air flow path 12 from the inside air introduction port 13b by the blower fan 15 is cooled and dehumidified by the evaporator 36, and is blown into the vehicle interior as cooling air through the heating bypass passage 18a. .

During the dehumidifying and heating operation, the evaporator switching door 17 is used to fully close the evaporator bypass passage 16a while the evaporator blow passage 16 is being closed.
Fully open. Further, the air mix door 19 distributes the conditioned air to the heating passage 18 and the heating bypass passage 18a at a predetermined ratio.

All of the conditioned air introduced from the inside air introduction port 13b into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36 and distributed to the heating path 18 and the heating bypass path 18a to form the heater core. The air-conditioning air heated by 41 and the sub-condenser 34 and the air-conditioning air that has passed through the heating bypass passage 18a are mixed and sent to the passenger compartment as heating air having a uniform temperature.

-Outside Air Introducing Operation- As shown in FIG. 1B, in the outside air introducing operation, the inside / outside air switching door 14b is closed to shut off the inside air, and the inside / outside air switching door 14a is opened to remove the outside air. It is introduced into the vehicle interior air flow path 12.

During the cooling operation, the EVA switching door 17 is used to fully close the EVA bypass passage 16a, while the EVA blowing passage 16 is fully opened. Further, the air mixing door 19 is used to heat the heating path
Is fully closed, and the heating bypass passage 18a is fully opened.

All of the conditioned air introduced from the outside air introduction port 13a into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36, and is blown into the vehicle interior as a cooling air through the heating bypass passage 18a. .

During the dehumidifying and heating operation, the evaporator switching door 17 is used to fully close the evaporator bypass passage 16a while the evaporator blow passage 16 is being closed.
Fully open. Further, the air mix door 19 distributes the conditioned air to the heating passage 18 and the heating bypass passage 18a at a predetermined ratio.

All of the conditioned air introduced from the outside air introduction port 13a into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36 and distributed to the heating path 18 and the heating bypass path 18a. The air-conditioned air that has been introduced and heated by the heater core 41 and the sub-condenser 34 and the air-conditioned air that has passed through the heating bypass passage 18a are mixed and sent to the vehicle interior as heating air having a uniform temperature.

-Inside / Outside Air Mixing Operation- The inside / outside air mixing operation is used when dehumidifying and heating in a cryogenic environment.

As shown in FIG. 1C, in the inside / outside air mixed operation, the inside / outside air switching doors 14a and 14b are opened to introduce the inside air and the outside air into the vehicle interior air flow passage 12.

During the inside / outside air mixing operation, the air changing door 17
Is neutralized to shut off the air blower passage 16 and the air bypass passage 16a, and fully open the air blower passage 16 and the air bypass passage 16a. Further, the air mixing door 19 is used for heating path 1
While fully opening 8, the heating bypass passage 18a is fully closed.

All the conditioned air introduced from the outside air introduction port 13a into the vehicle interior air flow path 12 by the blower fan 15 bypasses the evaporator 36 and is sent to the heater core 41 and the sub-condenser 34, and the inside air introduction port 13b. All the conditioned air introduced into the vehicle interior air flow path 12 by the blower fan 15 is sent to the evaporator 36, the heater core 41, and the sub-condenser 34.

As a result, the heated outside air and the dehumidified / heated inside air are mixed and blown into the passenger compartment as heating air having a uniform temperature.

-Operation-With the above configuration, in the dehumidifying and heating operation under the extremely low temperature outside air environment, the low temperature outside air bypasses the heat absorbing vehicle interior heat exchanger and is fed into the heat radiating vehicle interior heat exchanger. With this, it is possible to send low-humidity heating air into the passenger compartment, and the inside air is cooled and dehumidified by the heat-absorbing passenger compartment heat exchanger before being sent to the heat-dissipating passenger compartment heat exchanger. The refrigerant absorbs the heat of the inside air in the vehicle interior heat exchanger, and the refrigerant pressure can be stabilized.

As a result, the compressor inlet pressure will not be extremely lowered, so that sufficient dehumidifying and heating performance can be ensured without imposing an excessive burden on the compressor even in an extremely low temperature environment.

Further, since the EVA switching door has the function of a check valve, it is possible to prevent an increase in the number of parts and reduce the manufacturing cost.

Further, the inside air inlet 13b and the outside air inlet 1
By adjusting the opening degree of 3a, it is possible to control the air blowing ratio between the inside air and the outside air, so that it is possible to secure sufficient dehumidification heating performance while preventing an increase in manufacturing cost.

One example of the shape of the blower fan usable in this embodiment is a sirocco fan as shown in FIGS. 4 and 5 of Japanese Utility Model Laid-Open No. 49-150706.

FIG. 2 shows a vehicle air conditioner 10 according to the present invention.
It is a system block diagram which shows the structure of 2nd Embodiment of this.

The difference between this embodiment and the first embodiment is that
In the first embodiment, the outside air can flow into the evaporator blow passage 16 and the inside air can flow into the evaporator bypass passage 16a through the inside of the blower fan 15.
With the above-described configuration, the EVA ventilation passage 16 and the EVA bypass passage 1
The point that 6a is blocked by the partition wall 20 is a big difference.

An outside air introduction port 13a, an inside air introduction port 13b, an inside / outside air switching door 14 and a blower fan 15 are provided upstream of the evaporation blow passage 16 and upstream of the evaporation bypass passage 16a. Auxiliary outside air inlet 13a, auxiliary blower fan 15a, and check valve 1 for preventing backflow of conditioned air
7b is provided.

The blower fan 15 and the auxiliary blower fan 15a are arranged so that they can operate independently.

The description of the parts having the same structure will be omitted.

-Inside Air Circulation Operation- As shown in FIG. 2 (a), in the inside air circulation operation, the inside / outside air switching door 14 fully opens the inside air introduction port 13b while completely closing the outside air introduction port 13a. Be supported to do. Further, the check valve 17b is biased and supported so as to fully close the evaporation bypass passage 16a.

Further, the blower fan 15 is operated, the auxiliary blower fan 15a is stopped, and the inside air is exhausted to the air ventilation passage 16
To introduce.

During the cooling operation, the heating passage 18 is fully opened while the heating passage 18 is fully closed by the air mix door 19.

All of the conditioned air introduced from the inside air introduction port 13b into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36 and is blown into the vehicle interior as cooling air through the heating bypass passage 18a. .

During the dehumidifying and heating operation, the air mix door 1
At 9, the conditioned air is distributed to the heating passage 18 and the heating bypass passage 18a at a predetermined ratio.

All of the conditioned air introduced from the inside air introduction port 13b into the vehicle interior air flow path 12 by the blower fan is cooled and dehumidified by the evaporator 36, and distributed to the heating path 18 and the heating bypass path 18a. The air-conditioning air heated by 41 and the sub-condenser 34 and the air-conditioning air that has passed through the heating bypass passage 18a are mixed and sent to the passenger compartment as heating air having a uniform temperature.

-Outside Air Introducing Operation- As shown in FIG. 2B, in the outside air introducing operation, the inside / outside air switching door 14 fully closes the inside air introducing port 13b while fully opening the outside air introducing port 13a. Be supported to do. Further, the check valve 17b is biased and supported so as to fully close the evaporation bypass passage 16a.

Further, the blower fan 15 is operated, the auxiliary blower fan 15a is stopped, and the inside air is exhausted to the air blow passage 16
To introduce.

During the cooling operation, the heating passage 18 is fully opened while the heating passage 18 is fully closed by the air mix door 19.

All of the conditioned air introduced from the outside air introduction port 13a into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36, and is blown into the vehicle interior as cooling air through the heating bypass passage 18a. .

During the dehumidifying and heating operation, the air mix door 1
At 9, the conditioned air is distributed to the heating passage 18 and the heating bypass passage 18a at a predetermined ratio.

All of the conditioned air introduced from the outside air inlet 13a into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36 and is distributed to the heating path 18 and the heating bypass path 18a to form the heater core. The air-conditioning air heated by 41 and the sub-condenser 34 and the air-conditioning air that has passed through the heating bypass passage 18a are mixed and sent to the passenger compartment as heating air having a uniform temperature.

-Inside / Outside Air Mixing Operation- The inside / outside air mixing operation is used when dehumidifying and heating in a cryogenic environment.

As shown in FIG. 2C, in the case of the inside / outside air mixed operation, the inside / outside air switching door 14 is set to the inside air introduction port 13
It is supported so that b is fully opened and the outside air inlet 13a is fully closed. Further, the check valve 17b is used for the EVA bypass passage 1
6a is biased and supported so that 6a is fully closed.

Further, the blower fan 15 and the auxiliary blower fan 15a are operated so that the inside air is introduced into the evaporation blow passage 16 and the outside air is introduced into the evaporation bypass passage 16a. When the auxiliary blower fan 15a operates and the outside air is introduced from the auxiliary outside air introduction port 13a, the check valve 17b is opened by the introduced outside air, and the outside air is sent into the evaporation bypass passage 16a.

During the inside / outside air mixing operation, the air changing door 17
Is neutralized and the communication portion between the air blowing passage 16 and the air bypass passage 16a is blocked, and the air blowing passage 16 and the air bypass passage 16a are fully opened. Furthermore, air mix door 1
While fully opening the heating passage 18 at 9, the heating bypass passage 18a
Fully closed.

All of the conditioned air introduced from the auxiliary outside air introduction port 13a into the vehicle interior air flow path 12 by the auxiliary blower fan 15a bypasses the evaporator 36 and is fed into the heater core 41 and the sub-condenser 34, and the inside air introduction port 1
3b to the air passage 12 in the vehicle interior by the blower fan 15
All of the conditioned air introduced into the air conditioner is sent to the evaporator 36, the heater core 41, and the sub-condenser 34.

As a result, the heated outside air and the dehumidified / heated inside air are mixed and blown into the passenger compartment as heating air having a uniform temperature.

-Operation-With the above configuration, in the dehumidifying and heating operation under the extremely low temperature outside air environment, the low temperature outside air bypasses the heat absorbing vehicle interior heat exchanger and is fed into the heat radiating vehicle interior heat exchanger. With this, it is possible to send low-humidity heating air into the passenger compartment, and the inside air is cooled and dehumidified by the heat-absorbing passenger compartment heat exchanger before being sent to the heat-dissipating passenger compartment heat exchanger. The refrigerant absorbs the heat of the inside air in the vehicle interior heat exchanger, and the refrigerant pressure can be stabilized.

As a result, the compressor inlet pressure is not extremely lowered, so that sufficient dehumidifying and heating performance can be ensured without imposing an excessive load on the compressor even in a cryogenic environment.

Further, since the control means for operating the check valve is not necessary, it is possible to prevent the manufacturing cost from increasing.

Further, by providing the auxiliary blower fan, it becomes possible to control the blowing ratio of the outside air to the inside air with high accuracy, and it is possible to further prevent the window fogging and reduce the load on the compressor.

One example of the shape of the blower fan that can be used in this embodiment is a sirocco fan as shown in FIGS. 4 and 5 of Japanese Utility Model Laid-Open No. 49-150706. The sirocco fan can be applied to the present embodiment by using two sirocco fans having different outer dimensions and different width dimensions.

FIG. 3 shows a vehicle air conditioner 10 according to the present invention.
It is a system block diagram which shows the structure of 3rd Embodiment of this.

The difference between this embodiment and the first embodiment is that
In the first embodiment, the outside air can flow into the evaporator blow passage 16 and the inside air can flow into the evaporator bypass passage 16a through the inside of the blower fan 15.
With the above structure, the inside of the blower fan 15 is covered with the wall 15c.
The major difference is that they are divided by.

An outside air introduction port 13a, an inside air introduction port 13b, and an inside / outside air switching door 14 are provided upstream of the evaporation blow passage 16, and an auxiliary outside air introduction port 13a is provided upstream of the evaporation bypass passage 16a. An auxiliary outside air door 14c for opening and closing the auxiliary outside air introduction port 13a is provided.

Further, by closing the auxiliary outside air door 14c, the conditioned air is prevented from flowing backward through the evaporator bypass passage 16a and outflowing to the outside.

The description of the parts having the same structure will be omitted.

-Inside Air Circulation Operation- As shown in FIG. 3 (a), in the inside air circulation operation, the inside / outside air switching door 14 fully opens the inside air inlet 13b while fully closing the outside air inlet 13a. Be supported to do. Further, the auxiliary outside air door 14c is the auxiliary outside air introduction port 13a.
Is supported to be fully closed.

During the cooling operation, the heating passage 18 is fully opened while the heating passage 18 is fully closed by the air mix door 19.

All of the conditioned air introduced from the inside air introduction port 13b into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36, and is blown into the vehicle interior as cooling air through the heating bypass passage 18a. .

During the dehumidifying and heating operation, the air mix door 1
At 9, the conditioned air is distributed to the heating passage 18 and the heating bypass passage 18a at a predetermined ratio.

The conditioned air introduced into the vehicle interior air flow passage 12 from the inside air introduction port 13b by the blower fan 15 is all cooled and dehumidified by the evaporator 36 and is distributed to the heating passage 18 and the heating bypass passage 18a to form the heater core. The air-conditioning air heated by 41 and the sub-condenser 34 and the air-conditioning air that has passed through the heating bypass passage 18a are mixed and sent to the passenger compartment as heating air having a uniform temperature.

-Outside Air Introducing Operation- As shown in FIG. 3B, in the outside air introducing operation, the inside / outside air switching door 14 fully closes the inside air introducing port 13b while fully opening the outside air introducing port 13a. Be supported to do. Further, the auxiliary outside air door 14c is the auxiliary outside air introduction port 13a.
Is supported to be fully closed.

During the cooling operation, the heating passage 18 is fully opened while the heating passage 18 is fully closed by the air mix door 19.

All of the conditioned air introduced from the outside air introduction port 13a into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36, and is blown into the vehicle interior as a cooling air through the heating bypass passage 18a. .

During the dehumidifying and heating operation, the air mix door 1
At 9, the conditioned air is distributed to the heating passage 18 and the heating bypass passage 18a at a predetermined ratio.

All of the conditioned air introduced from the outside air introduction port 13a into the vehicle interior air flow path 12 by the blower fan 15 is cooled and dehumidified by the evaporator 36 and distributed to the heating path 18 and the heating bypass path 18a to form the heater core. The air-conditioning air heated by 41 and the sub-condenser 34 and the air-conditioning air that has passed through the heating bypass passage 18a are mixed and sent to the passenger compartment as heating air having a uniform temperature.

-Inside / Outside Air Mixing Operation- The inside / outside air mixing operation is used when dehumidifying and heating in a cryogenic environment.

As shown in FIG. 2C, in the case of the inside / outside air mixed operation, the inside / outside air switching door 14 is moved to the inside air introduction port 13
It is supported so that b is fully opened and the outside air inlet 13a is fully closed. The auxiliary outside air door 14c is supported so that the auxiliary outside air introduction port 13a is fully closed.

During the inside / outside air mixing operation, the heating bypass path 18 is opened while the heating path 18 is fully opened by the air mix door 19.
Fully close a.

Blower fan 1 from auxiliary outside air inlet 13a
The conditioned air introduced into the vehicle interior air flow passage 12 by
All bypass the evaporator 36 and the heater core 41
All of the conditioned air introduced into the vehicle interior air flow path 12 from the inside air introduction port 13b by the blower fan 15 is introduced into the evaporator 36, the heater core 41, and the sub-condenser 34.

As a result, the heated outside air and the dehumidified / heated inside air are mixed, and the heated air having a uniform temperature is blown into the passenger compartment.

-Operation-With the above configuration, in the dehumidifying and heating operation under the extremely low temperature outside air environment, the low temperature outside air bypasses the heat absorbing vehicle interior heat exchanger and is fed into the heat radiating vehicle interior heat exchanger. With this, it is possible to send low-humidity heating air into the passenger compartment, and the inside air is cooled and dehumidified by the heat-absorbing passenger compartment heat exchanger before being sent to the heat-dissipating passenger compartment heat exchanger. The refrigerant absorbs the heat of the inside air in the vehicle interior heat exchanger, and the refrigerant pressure can be stabilized.

As a result, the compressor inlet pressure is not extremely lowered, so that sufficient dehumidifying and heating performance can be ensured without imposing an excessive load on the compressor even in a cryogenic environment.

Further, since the auxiliary outside air door has the function of the check valve, it is possible to prevent an increase in the number of parts and reduce the manufacturing cost.

Further, by providing the partition inside the blower fan, the outside air introduced into the unit case and the inside air are not mixed in the blower fan.
Since the inside air is blown to the evaporator ventilation passage and the outside air is blown to the evaporation bypass passage, it is possible to further prevent the window fogging and reduce the load on the compressor without increasing the manufacturing cost.

One example of the shape of the blower fan that can be used in this embodiment is a sirocco fan as shown in FIG. 1 of Japanese Utility Model Laid-Open No. 49-150706.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing a configuration of a first embodiment of a vehicle air conditioner according to the present invention, (a) showing an inside air circulation operation state, (b) showing an outside air introduction operation state,
(C) has shown the inside / outside air mixing operation state.

FIG. 2 is a system configuration diagram showing a configuration of a second embodiment of a vehicle air conditioner according to the present invention, (a) showing an inside air circulation operation state, (b) showing an outside air introduction operation state,
(C) has shown the inside / outside air mixing operation state.

FIG. 3 is a system configuration diagram showing a configuration of a third embodiment of a vehicle air conditioner according to the present invention, (a) showing an inside air circulation operation state, (b) showing an outside air introduction operation state,
(C) has shown the inside / outside air mixing operation state.

FIG. 4 is a system configuration diagram showing a configuration of a conventional vehicle air conditioner.

[Explanation of symbols]

10 Vehicle air conditioner 11 unit case 12 Car interior air flow path 13a Outside air inlet 13b Inside air inlet 13c Auxiliary outside air inlet 15 Blower Fan 15a Auxiliary blower fan 15c partition 16 Eva air duct 16a Eva bypass road 17a EVA switching door (backflow prevention means) 17b Check valve (backflow prevention means) 18 heating path 18a Heating bypass path 19 air mix door 30 refrigeration cycle 31 compressor 34 Heat dissipation vehicle interior heat exchanger 36 Heat absorption vehicle interior heat exchanger

Claims (5)

[Claims] 1. A unit case (1) mounted on a vehicle and having a refrigeration cycle (30) in which a refrigerant circulates and a vehicle interior air flow path (12) in which conditioned air is blown.
1), a compressor (31) for compressing the refrigerant introduced into the refrigeration cycle (30), and an air conditioner for the refrigerant introduced in the vehicle interior air flow path (12). A heat-absorbing vehicle interior heat exchanger (36) that dehumidifies and cools the conditioned air by transmitting the heat of the wind, and a heat-absorbing vehicle interior heat exchanger (36) downstream of the vehicle interior air flow path (12). A heat radiating vehicle interior heat exchanger (34) for heating the conditioned air by transmitting the heat of the refrigerant that is installed and fed to the conditioned air, and the unit case (11) is provided with air outside the vehicle. An outside air introduction port (13a) to be introduced, an inside air introduction port (13b) to introduce air in the vehicle interior, and a blower fan (15) to introduce conditioned air into the vehicle interior air flow path (12) are provided. In the air conditioner for a vehicle, which is introduced into the vehicle interior air flow path (12) The air blow path (16) through which air is blown to the heat absorption vehicle interior heat exchanger (36) and the outside air introduced into the vehicle interior air flow path (12) is the heat absorption vehicle interior heat exchanger (36). ) Is provided with an EVA bypass passage (16a) and a backflow prevention means (17a, 17b) for preventing backflow of the conditioned air in the EVA bypass passage (16a). 2. The vehicle air conditioner according to claim 1, wherein an EVA switching door that switches between the EVA ventilation passage (16) and the EVA bypass passage (16a) communicating with the heat absorption vehicle interior heat exchanger (36). An air conditioner for a vehicle, comprising the backflow prevention means (17a). 3. The vehicle air conditioner according to claim 1, further comprising: the check valve (17b) for preventing the backflow. 4. The vehicle air conditioner according to claim 1, wherein the unit case (11) has an auxiliary outside air introduction port (13c) communicating with the EVA bypass passage, and the auxiliary outside air introduction port (13c). An air conditioner for a vehicle, characterized in that an auxiliary blower fan (15a) for introducing air-conditioning air to the air bypass passage (16a) is provided through 13c). 5. The vehicle air conditioner according to claim 1, wherein the unit case (11) has an auxiliary outside air introduction port (13a) communicating with the EVA bypass passage, and the blower fan (15). The partition part (15) for blocking between the air ventilation passage (16) and the air bypass passage (16a)
A vehicle air conditioner characterized by being provided with c).