JPH09240248A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a white fog phenomenon during a cooling operation with ventilation in an inside-outside air dual layer unit type air conditioner for a vehicle. SOLUTION: An inside/outside air introducing mode is selected in a cooling operation mode, an inside-outside air switching door 5 and an inside air open/ close door 6 are controlled so that respective inlets 2, 3, 4 and a communication space 23 are opened. In this way, the inside air and the outside air are mixed together so as to flow into an evaporator 8, so that a temperature difference and a relative humidity difference are reduced after they passes the evaporator 8. Therefore, condensation of water vapor is prevented in the vicinity of a face opening part 12 in which the outside air and the inside air are mixed together again, and a white fog phenomenon can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has two flow passages, a first air flow passage from the inside air introduction port to the vehicle interior and a second air flow passage from the outside air introduction port to the vehicle interior. The present invention relates to a so-called inside / outside air two-layer unit type vehicle air conditioner.

[0002]

2. Description of the Related Art A two-layer indoor / outdoor air unit type air conditioner for a vehicle is designed to improve the heating capacity of a vehicle having a small heat source for heating, such as a diesel engine vehicle or an electric vehicle. Specifically, it is as shown in FIG. That is, the partition plates 19 to 22 are provided in the air conditioning casing 1 so that the interior air outlets (the face outlet 12, the defroster outlet 1) are discharged from the first inside air inlet 3 to the vehicle interior.
1, the first air passage 17 leading to the foot outlet 13)
And a second air flow passage 18 from the outside air introduction port 2 or the second inside air introduction port 4 to the vehicle interior air outlet, two air passages are formed. Further, in both air flow paths 17 and 18,
A blower 7, an evaporator 8 and a heater core 9 are provided, and these air passages 17, 18 are provided by these devices.
The air inside is blown, cooled, and heated. In addition, 10 is an air mix door, and 14, 15 and 16 are doors for opening and closing the respective air outlets 11, 12, and 13.

Then, during the heating operation in winter, the outside air inlet 2
The low-humidity outside air introduced from the inside is blown out toward the window glass from the defroster outlet 11 through the second air passage 18, and the inside air introduced from the inside air inlet 3 is blown through the inside air passage 17 through the foot. A blowing mode in which the air is blown from the outlet 13 toward the feet of the passenger in the passenger compartment can be selected. Then, when this blowing mode is selected, low-humidity outside air is blown to the window glass, so that the window glass is prevented from being fogged and the already warmed inside air enters the first air flow path 17. be introduced. Therefore, the heating load on the heater core 9 is reduced, and as a result, the heating capacity is improved.

[0004]

By the way, the inventors of the present invention introduced the outside air and the inside air into the vehicle air conditioner at the same time during the summer cooling operation as in the above heating operation. In order to reduce the cooling load compared to the introduction operation, the air introduced from each introduction port was cooled by the evaporator 8 and blown out toward the vehicle interior. In one case (for example, as shown in FIG. 6, only the face outlet 12 is in an open state), a white mist phenomenon described below may occur.

Therefore, the inventors of the present invention have conducted tests and examinations, and have found that the white fog phenomenon occurs due to the following reasons. Hereinafter, description will be made with reference to FIG. That is, the inside air flowing through the first air flow path 17 and the outside air flowing through the second air flow path 18 are independently blown to the face air outlet 12, and after passing through the evaporator 8, the air near the face air outlet 12 is the first time. Combine and mix.

In addition, since the temperature and the relative humidity of the outside air are generally high during the summer cooling operation, if the outside air is cooled by the evaporator 8 in this state, the relative humidity of the outside air becomes higher. Therefore, when the inside air and the outside air merge near the face outlet 12, the outside air having a high relative humidity is cooled by the inside air having a low temperature, and the water vapor in the outside air is condensed to cause a white mist phenomenon. .

That is, the inside air and the outside air having different temperatures and relative humidity are cooled independently of each other, and the white fog phenomenon occurs when the cooled inside air merges with the outside air having a higher relative humidity. For this reason, when the inside air and the outside air have to join each other only after passing through the evaporator 8, for example, when there is only one vehicle interior outlet in the open state, the white mist phenomenon is likely to occur.

In view of the above points, an object of the present invention is to suppress the white fog phenomenon during ventilation cooling operation in a vehicle air conditioner of a two-layer indoor / outdoor air unit type.

[0009]

The present invention uses the following technical means in order to achieve the above object. Claim 1
In the invention described in 3, in the cooling operation mode, both the air inside the vehicle and the air outside the vehicle are introduced, the introduced air is cooled by the cooling means (8), and then the air is mixed and blown into the vehicle interior. It is characterized in that both airs are mixed also on the air upstream side of the cooling means (8).

As a result, both airs are mixed on the upstream side of the cooling means (8), so that the temperature difference and the relative humidity difference between both airs after passing through the cooling means (8) become small. Therefore, since the dew condensation of the water vapor is suppressed when the both air is merged and mixed again, the occurrence of the white mist phenomenon can be suppressed.
In the invention according to claim 2, after both the air inside the vehicle and the air outside the vehicle are mixed in the communication space (23),
It is characterized in that it is sucked into the blower (7) and blown out toward the passenger compartment.

According to the third aspect of the present invention, when the mode in which both the vehicle interior air and the vehicle exterior air are introduced by the introduction air mode setting means (40) in the cooling operation mode, both introduction ports are selected. (2, 3) and communication space (2
It is characterized by opening 3). In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; (First Embodiment) FIG. 1 is a block diagram schematically showing the whole ventilation system of the present embodiment, which is the same as the ventilation system described in the section of the prior art. Reference numeral 1 denotes an air-conditioning casing that forms a flow path for air, and an air-conditioning casing 1 is provided at one end thereof with an outside-air inlet 2 for introducing outside air, a first inside-air inlet 3 for introducing inside air, and a second inside-air inlet 4 for forming inside air. ing. Inside the air conditioning casing 1, an inside / outside air switching door 5 for selectively opening / closing the outside air introduction port 2 and the second inside air introduction port 4, and a first
An inside air opening / closing door 6 for opening / closing the inside air inlet 3 is provided.

The inside / outside air switching door 5 is a so-called rotary type door that opens and closes the outside air introduction port 8 and the second inside air introduction port 4 by swinging around a rotation shaft (not shown). Each of the doors 5 and 6 has a driving means (specifically, the servo motors 30 and 3 shown in FIG. 2).
It is driven by 1). In addition, both inlets 2, 3,
4, an air blower 7 that blows air to a later-described first flow path 20 and a second flow path 21 is provided in the air conditioning casing 1 on the downstream side of the air. A first fan 71 that blows air and a second fan that blows air to the second flow path 21.
It is composed of a fan 72 and one blower motor 73 that rotationally drives both fans. The first fan 71 mainly blows air toward the foot opening 13 described later, and the second fan 72 mainly blows air toward the defroster opening 11 or the face opening 12 described later. In the present embodiment, since the blower motor 73 is arranged on the side of the second fan 72, the suction resistance of the second fan 72 increases, so the outer diameter and inner diameter of the second fan 72 are set to the first fan 71.
Larger than.

Further, an evaporator 8 for cooling the air flowing in both flow paths 20 and 21 is provided on the air downstream side of both fans 71 and 72 in the air conditioning casing 1.
The evaporator 8 is provided in the air conditioning casing 1 so that all the air in the air conditioning casing 1 passes through the evaporator 8. In addition to the compressor not shown, a condenser, pressure reducer, etc. not shown are also provided. It is also a heat exchanger that constitutes a well-known refrigeration cycle.

A heater core 9 for heating the air passing through the evaporator 8 is provided on the air downstream side of the evaporator 8 in the air conditioning casing 1. The heater core 9 has a bypass passage (not shown in FIG. 1 because the air in the air conditioning casing 1 bypasses the heater core 9 is located on the back side of the heater core 9 in the drawing) so that the inside of the air conditioning casing 1 is formed. The cooling water for the engine circulates inside, and the cooling water is used as a heat source to heat the air in the air conditioning casing 1.

On the air upstream side of the heater core 9, an air mix door 10 for adjusting the air flow rate ratio between the air flow passing through the heater core 9 and the air flow passing through the bypass passage is provided. The air mix door 10 is driven by its driving means (specifically, the servo motor 32 shown in FIG. 2). A defroster opening 11, a face opening 12, and a foot opening 13 are formed at the most downstream end of the air conditioning casing 1. Hereinafter, these openings will be collectively referred to as a vehicle compartment outlet opening. .

A defroster duct (not shown) is connected to the defroster opening 11, and the conditioned air introduced into the defroster duct is discharged from the defroster outlet at the downstream end of the defroster duct to the vehicle windshield. Is blown toward the inside of the. Further, a center face duct and a side face duct (not shown) are connected to the face opening 12. Of these, the conditioned air introduced into the center face duct is blown from the center face outlet, which is the downstream end of this center face duct, toward the upper body of the passenger in the passenger compartment, and the air conditioner introduced into the side face duct. The wind is blown toward the vehicle side glass from the side face outlet which is the downstream end of the side face duct.

Further, a foot duct (not shown) is connected to the foot opening 13, and the conditioned air introduced into the foot duct is discharged from a foot outlet, which is a downstream end of the foot duct, to a passenger in the passenger compartment. Is blown toward the feet of. A defroster door 14, a face door 15, and a foot door 16 are provided on the upstream side of the openings 11 to 13. Defroster Door 14
Is a door that opens and closes an air inflow path to the defroster duct, the face door 15 is a door that opens and closes an air inflow path to the center face duct, and the foot door 16 is
It is a door that opens and closes an air inflow path to the foot duct.

The doors 14 to 16 are driven by respective drive means (specifically, servo motors 33, 34 and 35 shown in FIG. 2, respectively). In addition, the air inflow passage to the side face duct is
It is not opened or closed depending on ~ 16. An air outlet grill (not shown) for manually opening and closing the side face air outlet is provided near the side face air outlet, and an air inflow path to the side face duct is opened and closed by the air outlet grill.

The space inside the air conditioning casing 1 is
The first air flow path 17 extending from the inside air inlet 3 to the vehicle interior outlets 11, 12, 13 and the first air flow passage 17 extending from the outside air inlet 2 or the second inside air inlet 4 to the vehicle interior outlets 11, 12, 13. The partition plates 19 to 22 which are divided into the two air flow paths 18,
It is provided in the air conditioning casing 1. Then, between the both inlets 2, 3, 4 and the blower 7, both air flow paths 17,
A communication space 23 for communicating 18 is formed, and control of the communication state of the communication space 23 is performed by the inside air opening / closing door 6 (see FIG. 6).

The above-mentioned servomotors 30 to 35, the blower motor 73, etc. are controlled by an air conditioning control unit (ECU) 36 as shown in FIG. A signal from a sensor group 37 such as an outdoor temperature sensor, a signal from a temperature setting means 38 for setting an indoor temperature desired by an occupant, and a blow mode setting means for manually selecting a blow mode of air to the room. Introduced air mode setting means 4 for selecting introduced air
The signal from 0 is input.

Next, the operation of the air conditioner according to this embodiment (air flow in the air conditioning casing 1) will be described. 1. Inside / Outside Air Introduction Cooling Operation Mode When the cooling operation is performed in a state in which the mode of introducing both the inside air and the outside air is selected, the inside air opening / closing door 6 and the inside / outside air switching door 5 are in a half-open state as shown in FIG. Since the inside air opening / closing door 6 is in the half-opened state, the inside air is introduced from the first inside air inlet 3 and
The first air flow path 17 and the second air flow path are in communication with each other through the communication space 23. Further, since the inside / outside air switching door 5 is in the half-opened state, air is introduced from both the outside air introducing port 2 and the second inside air introducing port 4.

The foot opening 13 and the defroster opening 11 are closed by the doors 14 and 16 in order to intensively blow the cool air toward the upper body of the passenger in the passenger compartment. Since the communication space 23 is in the communication state, the inside air introduced from both the inside air introduction ports 3 and 4 and the outside air introduced from the outside air outside air introduction port 2 are sucked into the blower 7 in a mixed state. The air is blown toward both air flow paths 17 and 18.

After that, the air flowing through both air flow paths 17 and 18 is cooled by the evaporator 8, merges and mixes again near the face opening 12, and is blown out from the face opening 12 into the vehicle interior. . Note that, during cooling operation, only the face opening 12 is usually open as described above in many cases, so in the present embodiment, an example in which the face opening 12 is open has been described. Openings (foot opening 13, defroster opening 11
This mode can be applied even when only (for example,) is open.

2. Outside air introduction operation mode When the outside air introduction mode is selected, the first inside air introduction port 3 is completely closed by the inside air opening / closing door 6 as shown in FIG. The second inside air introducing port 4 is completely closed by the door 5. As a result, only the outside air introduction port 2 is opened and the communication space 23
Becomes a communication state. Therefore, the outside air passes through both air flow paths by the blower 7 and blows out into the vehicle compartment.
Is blown towards.

3. Inside air introduction operation mode When the inside air introduction mode is selected, the first inside air introduction port 3 is opened and the communication space 23 is closed by the inside air opening / closing door 6 as shown in FIG. 4 regardless of the cooling operation or the heating operation. . Further, the inside / outside air switching door 5 completely closes the outside air introduction port 2 and completely opens the second outside air introduction port 4.

As a result, the inside air introduced from the first inside air introduction port 3 is blown toward the vehicle compartment outlets 11, 12, 13 through the first air flow path 17, and the second outside air introduction port 4 is introduced.
The inside air introduced from the air is blown toward the vehicle compartment outlets 11, 12, 13 through the second air flow path 18. 4. Inside / outside air introduction heating operation mode The operation in this mode is the same as the operation described in the section of the related art.

The introduction air mode setting means 40 automatically selects the mode in consideration of the manual type manually selected by the occupant, the indoor / outdoor temperature, the amount of solar radiation, the indoor temperature desired by the occupant, and the like. Either of auto type may be used. Next, the effect in the inside / outside air introduction cooling operation mode, which is a characteristic operation of this embodiment, will be described.

Since the inside air introduced from both the inside air introduction ports 3 and 4 and the outside air introduced from the outside air outside air introduction port 2 flow to the evaporator 8 in a mixed state, the evaporator 8
The difference in temperature and relative humidity after passing is small. Therefore, the dew condensation of water vapor is suppressed in the vicinity of the face opening 12 where both air are mixed again, so that the occurrence of the white mist phenomenon can be suppressed.

Further, in the introduction air mode setting means 40,
Even when the occupant selects the outside air introduction mode, the cooling load can be reduced by setting the inside / outside air mixing mode. As a result, the load on the compressor is reduced, and the fuel efficiency of the vehicle can be improved. By the way, in the above-described embodiment, the outside air and the inside air are mixed in the communication space 23 formed upstream of the blower 7, but, for example,
A communication space may be formed in the partition plate 22 between the blower 7 and the evaporator 8 so that both air flow paths communicate with each other, and the communication space may be opened and closed to mix the outside air and the inside air.

Further, like the air conditioner for the bus, the blower 7
May be disposed on the air downstream side of the evaporator 8 and the outside air and the inside air may be mixed on the air upstream side of the evaporator 8.
Moreover, in the above-described embodiment, the first inside air inlet 3 and the communication space 23 are opened and closed by the inside air opening / closing door.
A means for opening / closing the inside air inlet 3 and a means for opening / closing the communication space 23 may be independently provided.

Further, the air flow path length from the first inside air introduction port 3 and the outside air introduction port 2 to the first fan 71, and the air flow path from the second inside air introduction port 4 and the outside air introduction port 2 to the first fan 72. By making the lengths substantially equal to each other, the temperature and the relative humidity of the air flowing through the air passages 17 and 18 immediately before passing through the evaporator 8 can be made more equal. As a result, the temperature difference and the relative humidity difference between the air flowing through the air flow paths 17 and 18 are reduced, so that the occurrence of the white mist phenomenon can be further suppressed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a ventilation system of the present embodiment.

FIG. 2 is a configuration diagram showing a control system of the present embodiment. .

FIG. 3 is a configuration diagram showing an outside air introduction operation mode of a ventilation system.

FIG. 4 is a configuration diagram showing an inside air introduction operation mode of a ventilation system.

FIG. 5 is a configuration diagram showing an inside / outside air introduction heating operation mode of a ventilation system.

FIG. 6 is a configuration diagram showing an inside / outside air introduction cooling operation mode of a ventilation system according to a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air-conditioning casing, 2 ... Outside air introduction port, 3 ... 1st inside air introduction port, 4 ... 2nd inside air introduction port, 5 ... Inside / outside air switching door, 6 ...
Inside air opening / closing door, 7 ... Blower, 8 ... Evaporator (cooling means), 9 ... Heater core, 10 ... Air mix door, 11
Defroster openings 12, 12 Face openings 13, 13 Foot openings 13, 14 Defroster doors 15, Face doors 16, Foot doors 17, First air passages 18,
... 2nd air flow path, 19-22 ... Partition plate, 23 ... Communication space.

Claims (3)

[Claims] 1. An inside air inlet (3) for introducing air into a vehicle compartment
From the vehicle interior air outlet (11, 1, 1)
The first air flow path (1
7), a second air flow path (18) forming a flow path of air from an outside air introduction port (2) for introducing air outside the vehicle interior to the vehicle interior air outlet (11, 12, 13), and It is provided on the air downstream side from the inlets (2, 3), and from the both inlets (2, 3) side, the vehicle interior air outlet (11,
The air is directed toward both sides of the air passages (1 and 12, 13).
A blower (7) for blowing air to the air passages (7, 18), and a cooling means (8) provided in the air passages (17, 18) for cooling the air flowing in the air passages (17, 18). In the cooling operation mode in which both the air in the vehicle interior and the air outside the vehicle are introduced, the introduced air is cooled by the cooling means (8), and the air is mixed and blown out into the vehicle interior. An air conditioning system for vehicles, characterized in that both air is mixed also on the air upstream side of the cooling means (8). 2. The blower (7) is provided on the air upstream side of the cooling means (8), and is formed between the both inlets (2, 3) and the blower (7), The air blower has a communication space (23) for communicating the both air flow paths (17, 18), and both the air inside the vehicle and the air outside the vehicle are mixed in the communication space (23) and then the blower. The vehicle air conditioner according to claim 1, wherein the air conditioner is inhaled to (7). 3. Opening / closing means (5, 6) for opening / closing both the inlets (2, 3) and the communication space (23), and an introduced air mode setting means (40) for selecting introduced air.
When the mode in which both the air inside the vehicle and the air outside the vehicle are introduced by the introduction air mode setting means (40) in the cooling operation mode, the both introduction ports (2, 3) and the air Control means (30, 3) for controlling the opening / closing means (5, 6) so as to open the communication space (23).
The vehicle air conditioner according to claim 2, further comprising: