JP2010006325A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner excellent in energy saving by utilizing cooled drain water without requiring a condensed water transportation structure for leading the drain water to a remote place. <P>SOLUTION: An evaporator bypass 23 for bypassing an evaporator 6 to make air directing to the inside of a cabin flow is provided immediately under the evaporator 6. A heat exchanger 24 for performing heat exchange between drain water dropped from the evaporator 6 and air passing through the evaporator bypass 23 is provided immediately under the evaporator 6. An evaporator bypass opening/closing door 29 capable of opening and closing the evaporator bypass 23 is provided. When quick cooling is performed, the evaporator bypass 23 is closed and all air blown to the inside of the cabin is strongly cooled. When energy saving air conditioning is performed, the evaporator bypass 23 is opened, air passing through the evaporator bypass 23 is cooled by drain water dropped from the evaporator 6, the cold heat of the drain water is recovered to be blown into the cabin, and thereby excellent energy saving performance can be exhibited. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioner capable of cooling operation by an evaporator, and more particularly to a cooling technology capable of energy saving operation.

When the cooling operation is performed with the refrigeration cycle activated, a part of the water vapor contained in the air passing through the evaporator is condensed on the evaporator. The drain water generated by the condensation of the evaporator is dropped from the evaporator by gravity and discharged from the outlet to the outside of the air conditioner.
Since the drain water is water that has condensed on the evaporator, it is cooled to the surface temperature of the evaporator. Proposals have been made to increase the cooling capacity using this cooled drain water (see, for example, Patent Documents 1 and 2).

Patent document 1 is a technique for collecting drain water generated by an evaporator and guiding it to a condenser, and spraying the drain water in the condenser to increase the cooling capacity.
On the other hand, Patent Document 2 collects drain water generated by an evaporator, guides it to a drain evaporator, and forcibly evaporates the drain water with this drain evaporator, and the high pressure upstream of the pressure reducing device by the latent heat of evaporation at that time. This is a technology that increases the cooling capacity by cooling the refrigerant.

However, in Patent Documents 1 and 2, the location where the drain water is generated and the location where the drain water is used are separated, and a condensed water transport structure for guiding the drain water to the remote location is required. A space for providing a water transport structure is required, resulting in an increase in cost and an increase in size (in a vehicle air conditioner, vehicle mountability is deteriorated).
JP-A-9-207542 JP 2003-35460 A

  The present invention has been made in view of the above problems, and its purpose is to utilize cooled drain water without requiring a condensed water transport structure for guiding drain water to a remote location. An object of the present invention is to provide an air conditioner having excellent energy saving performance capable of cooling the air toward the room to be air conditioned.

[Means of claim 1]
In the air conditioner employing the means of claim 1, in the heat exchanging means (24) provided immediately below the evaporator (6), the air that bypasses the evaporator (6) {air passing through the evaporator bypass (23)} It is cooled by drain water dripped from the evaporator (6). In this way, the cold heat of the drain water that has been discarded in the prior art is recovered and blown out indoors. For this reason, it is possible to obtain an air cooling capacity greater than that of the prior art with the same energy consumption as that of the prior art.
Moreover, since the drain water dripped from the evaporator (6) is utilized in the heat exchange means (24) directly under the evaporator (6), a condensed water transport structure for guiding the drain water to a remote place is not required. . Thereby, while being able to suppress the enlargement by utilizing drain water, a cost rise can be suppressed.

[Means of claim 2]
The heat exchanging means (24) of the air conditioner employing the means of claim 2 is a heat exchanger (24) for exchanging heat between the drain water and the air passing through the EVA bypass (23). The vessel (24) includes a plurality of tubes (25) through which drain water dripped from the evaporator (6) flows, and air passing through the evaporator bypass (23) flows between the plurality of tubes (25). is there.
The heat exchanger (24) is intended to increase the heat exchange efficiency between the drain water and the air passing through the EVA bypass (23) {that is, the air that efficiently passes the cold water of the drain water through the EVA bypass (23). It is desirable that it is made of a material having excellent heat conductivity such as aluminum and has a large area in contact with air passing through the EVA bypass (23).

[Means of claim 3]
The heat exchanging means (24) of the air conditioner adopting the means of claim 3 is a fin or concavo-convex for promoting heat exchange between the air passing through the evaporator bypass (23) and the drain water dripped from the evaporator (6). Is provided.
In this way, heat exchange between the air passing through the evaporator bypass (23) and the drain water dripped from the evaporator (6) is promoted by fins or unevenness, so that the air passing through the evaporator bypass (23) is accelerated. Cooling efficiency can be increased.

[Means of claim 4]
The air conditioner adopting the means of claim 4 includes an EVA bypass opening / closing door (29) capable of opening / closing the EVA bypass (23) and a control device for controlling the opening degree of the EVA bypass opening / closing door (29) according to the air conditioning state. With.
Thereby, all the air blown into the vehicle interior passes through the evaporator (6), and all the air blown into the vehicle interior is strongly cooled, whereby rapid cooling of the vehicle interior is performed. Also, when energy-saving air conditioning is required, the EVA bypass (23) is opened by the EVA bypass opening / closing door (29), thereby recovering the cold heat of the drain water that was discarded in the prior art and blowing it out indoors. . For this reason, it is possible to obtain an air cooling capacity greater than that of the prior art with the same energy consumption as that of the prior art.

[Means of claim 5]
The air conditioner employing the means of claim 5 comprises a drainage port (22) for draining drain water that has passed through the heat exchanger (24) directly below the heat exchanger (24). 22) and the upstream side of the air flow of the heat exchanger (24) in the EVA bypass (23) communicate with each other.
Thereby, the water which infiltrated from the outside can be discharged | emitted in common with the drain outlet (22) of drain water.

[Means of claim 6]
The air conditioner adopting the means of claim 6 includes an evaporator opening / closing door (32) capable of opening / closing an evaporation channel (31) through which air passing through the evaporator (6) flows, and an evaporation opening / closing door (32 according to the air conditioning state) ).
Thus, in an operation state in which the refrigeration cycle is temporarily stopped (for example, during idling stop when applied to a vehicle air conditioner), the evaporation channel (31) is closed by the evaporation opening / closing door (32), By allowing air to flow through the bypass (23), only the cold air that collects the cold heat of the drain water can be blown into the room. That is, only the cold air that bypasses the evaporator (6) (cold air that collects the cold heat of the drain water) is blown into the room.
Thereby, the generation | occurrence | production of the air-conditioner odor which arises when the water | moisture content of the surface of an evaporator (6) evaporates and it blows off indoors can be prevented.

The air conditioner may be a vehicle air conditioner that can air-condition the vehicle interior or a stationary air conditioner that can air-condition the interior (indoor air conditioner for home use, business use, etc.). An evaporator (6) that cools the air toward the target room (vehicle interior, indoors, etc.) is provided, and at least a cooling operation is possible.
This air conditioner is provided with an evaporator bypass (23) that directly bypasses the evaporator (6) and flows air toward the air-conditioned room directly below the evaporator (6).
The air conditioner also includes heat exchange means {for example, drain water that exchanges heat between the air passing through the evaporator bypass (23) and the drain water dripped from the evaporator (6) immediately below the evaporator (6). A plurality of tubes (25) to be flowed and a heat exchanger (24) for performing heat exchange between the air flowing between the tubes (25) and the like}.

A first embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIGS.
(Schematic configuration of vehicle air conditioner)
The vehicle air conditioner controls the operation of the HVAC (a unit in which a heater unit, a ventilation unit, and an air conditioner unit are combined into one unit: see FIG. 1) that performs heating, blowing, and cooling of the passenger compartment. It comprises a control device (hereinafter referred to as an air conditioning ECU: not shown).
The HVAC is arranged inside an instrument panel (dashboard) at the front part of the vehicle interior, and is roughly divided into two parts, a blower unit 1 and an air conditioning unit 2, and the blower unit 1 and the air conditioning unit. 2 is mounted on the vehicle in a coupled state. In FIG. 1, the front, rear, upper, and lower arrows indicate the direction of the HVAC mounted in the vehicle.

(Description of blower unit 1)
The blower unit 1 includes an inside / outside air switching box 3 for selecting and taking in the inside air (vehicle interior air) or the outside air (vehicle outside air), and a blower 4 for blowing the air selected in the inside / outside air switching box 3 to the air conditioning unit 2. And in combination.
The inside / outside air switching box 3 includes an outside air introduction port communicating with the outside of the vehicle interior, an inside air introduction port communicating with the vehicle interior, and an inside / outside air switching door capable of opening and closing the outside air introduction port or the inside air introduction port. The air selected by the above (outside air, inside air, or mixed air of outside air and inside air) is introduced into the inside / outside air switching box 3.
The blower 4 is a centrifugal electric fan formed by combining a fan and an electric motor. When energized from an air conditioning ECU (not shown), the blower 4 is selected by an inside / outside air switching box 3 (specifically, an inside / outside air switching door). The sucked air is sucked and pumped into the air conditioning unit 2.

(Description of air conditioning unit 2)
The air conditioning unit 2 includes a resin air conditioning case 5 that forms an air passage from the connection port of the blower unit 1 toward the vehicle interior. The air conditioning case 5 is formed of a resin having elasticity like polypropylene and high mechanical strength. Specifically, the air conditioning case 5 adopts a structure in which it is divided into a plurality of parts and then joined together by fastening parts for reasons such as die cutting during molding and reasons for assembling functional parts inside. is doing.

  In the air conditioning unit 2, from the upstream side to the downstream side of the air flow, (a) a cooling unit that cools the air flow blown into the vehicle interior, and (b) heating of the air flow blown into the vehicle interior. The heating part to perform, (c) The blower outlet switching part which switches the blower outlet of the airflow which blows off into a vehicle interior is provided.

(Description of cooling part)
The cooling unit is provided with an evaporator 6 that cools the air flow. The evaporator 6 is a part of the vehicle refrigeration cycle.
A schematic configuration of the refrigeration cycle for a vehicle will be described. The vehicle refrigeration cycle includes a refrigerant compressor that performs a suction and compression operation of the refrigerant, a condenser (refrigerant condenser) that liquefies and condenses the high-temperature and high-pressure refrigerant compressed by the refrigerant compressor with the outside air, and the condenser The pressure reduction device (expansion valve, etc.) that converts the high-temperature and high-pressure liquid refrigerant liquefied at the low-temperature and low-pressure into a low-temperature and low-pressure mist-like refrigerant, and heat exchange with the air blown into the vehicle compartment. In addition, an evaporator 6 (refrigerant evaporator) that evaporates low-temperature and low-pressure mist refrigerant is provided. The vapor refrigerant evaporated by the evaporator 6 is again sucked into the refrigerant compressor, and the above cycle is repeated.

The refrigerant compressor is driven by, for example, an engine for running a vehicle (for example, a swash plate type variable capacity compressor whose discharge capacity is controlled by an instruction from an air conditioning ECU), and the rotation of the crankshaft of the engine. The output is transmitted through power transmission means such as a pulley and a belt, and refrigerant suction operation and compression discharge operation are performed. The refrigerant compressor may be an electric compressor that is directly driven by an electric motor.
On the other hand, as described above, the evaporator 6 disposed in the air conditioning unit 2 flows in the low-temperature and low-pressure mist refrigerant decompressed by the decompression device, and the low-temperature and low-pressure mist refrigerant flows from the air passing through the evaporator 6. It absorbs heat and evaporates. At this time, the mist refrigerant absorbs heat from the air passing through the evaporator 6, whereby the air passing through the evaporator 6 is cooled.
In addition, the energy-saving technique in a cooling part is mentioned later.

(Description of heating unit)
Inside the air conditioning case 5, there is provided a hot air passage in which a hot water heater core 7 (an example of a heat exchanger for heating) is disposed, and a cold air bypass 8 that bypasses the hot air passage (bypasses the heater core 7). It has been.
Here, the heater core 7 is provided so that the engine cooling water (hot water) can be circulated and supplied, and the air passing through the heater core 7 is heated by exchanging heat between the engine cooling water and the air passing through the heater core 7. The

On the upstream side of the air flow of the heater core 7, the flow rate of air passing through the heater core 7 (that is, the amount of hot air heated by the heater core 7) and the flow rate of air passing through the cold air bypass 8 (that is, the amount of cold air that bypasses the heater core 7). ) And an air mix door 9 for adjusting the ratio. In addition, this air mix door 9 may be comprised with a plate-shaped door, and may be a film-type door.
Here, in FIG. 1, an auxiliary cold air bypass 10 that bypasses both the heater core 7 and the cold air bypass 8 is provided above the cold air bypass 8, and the auxiliary cold air bypass 10 is provided so as to be openable and closable by the open / close door 11. As shown, the auxiliary cold air bypass 10 and its opening / closing door 11 may be omitted.

(Explanation of outlet switching unit)
The air outlet switching unit switches the air outlet of the conditioned air that has passed through the air conditioning unit 2. The air conditioned air (mainly) is directed toward the inside of the windshield at the downstream side of the air flow in the air conditioning case 5. Defroster opening 12 leading to the defroster outlet for blowing out the warm air), face opening 13 leading to the face outlet for blowing the conditioned air (mainly cold air) toward the upper body of the front seat occupant, the feet of the front seat occupant A foot opening (not shown) that leads to a foot outlet for blowing conditioned air (mainly hot air) toward the section is provided.

The defroster opening 12 is provided with a defroster door 14 that opens and closes the defroster opening 12 and adjusts the opening degree of the defroster opening 12.
The face opening 13 is provided with a face door 15 that adjusts the opening and closing of the face opening 13 and the opening degree of the face opening 13.
A foot door (not shown) that adjusts the opening and closing of the foot opening and the opening degree of the foot opening is disposed in the foot opening.
The defroster door 14, the face door 15, and the foot door may be constituted by plate-like doors, film type doors, or rotary doors.

  Here, the air outlet switching unit shown in FIG. 1 includes, in addition to the air outlets described above, a rear face opening 16 leading to a rear face air outlet for blowing air-conditioned air toward the upper body of the rear seat occupant, A rear foot opening 17 leading to a rear foot outlet for blowing air-conditioned air toward the foot portion of the rear door is provided, and a rear face door 18 and a rear foot door 19 for opening and closing the rear face opening 16 and the rear foot opening 17 are provided. Further, at the downstream portion of the air flow of the air conditioning unit 2, a rear cool air opening 20 a that guides cool air to the rear face opening 16 and the rear foot opening 17, and a rear hot air opening 20 b that guides warm air to the rear face opening 16 and the rear foot opening 17. A rear air conditioning switching door 21 is provided for switching between the two. It should be noted that these rear seat outlet switching units may not be mounted.

(Explanation of ECU for air conditioning)
The air conditioning ECU includes a CPU for performing control processing and arithmetic processing, a storage device (memory such as RAM, ROM, SRAM, and EEPROM) for storing various programs and data, an input circuit, an output circuit, a power supply circuit, and the like. In accordance with signals (such as occupant operation instructions and detected temperatures) from the read sensors (including switches operated by the occupant, etc.) and the control program stored in the vehicle. The operation control of various electric operation parts (blower 4, the above-mentioned refrigerant compressor, the servomotor which drives each door mentioned above, etc.) mounted in the air conditioner for operation is performed.

Specifically, the air conditioning ECU automatically adjusts the blowout air volume and the blowout temperature (the airflow control of the blower 4 and the refrigeration cycle) from the operation state (occupant operation instructions, detected temperature, etc.) read from the switches and sensors. Automatic temperature adjustment means (control program for auto air conditioner) that performs operation control, air mix door opening control, etc., and automatic blowout that performs automatic selection of blowout ports (control of servo motors that drive each blowout door) An exit selection means (a control program for the automatic blowing mode) is installed, and an automatic air conditioner and an automatic blowing mode can be set by a passenger.
In the following description, it is assumed that the vehicle air conditioner is set to an auto air conditioner and an auto blow-out mode as a specific example.

[Features of Example 1]
When the cooling operation with the refrigeration cycle is performed, a part of the water vapor contained in the air passing through the evaporator 6 is condensed on the evaporator 6. The drain water generated by the condensation of the evaporator 6 is dropped from the evaporator 6 by gravity and is discharged to the outside from the drain port 22 provided in the air conditioning case 5 at a position below the evaporator 6.
Since the drain water is water that has condensed on the evaporator 6, the drain water is cooled to the surface temperature of the evaporator 6.

The HVAC according to the first embodiment is equipped with a technique for reducing the energy consumption of the cooling by supplying the cooling water of the drain water to the air blown into the vehicle interior before discharging the drain water dripped from the evaporator 6.
This energy saving technology will be specifically described.
In the HVAC according to the first embodiment, an evaporator bypass 23 is provided immediately below the evaporator 6 to flow the air that bypasses the evaporator 6 and flows toward the vehicle interior (an example of a room to be air-conditioned).
Further, immediately below the evaporator 6, heat exchange means for exchanging heat between the drain water dripped from the evaporator 6 and the air passing through the evaporator bypass 23 is provided.

In the first embodiment, the heat exchanging means for exchanging heat between the drain water dripped from the evaporator 6 and the air passing through the evaporator bypass 23 performs heat exchange between the drain water and the air passing through the evaporator bypass 23. This is a heat exchanger 24.
As shown in FIG. 3, the heat exchanger 24 includes a plurality of tubes 25 in which drain water dripped from the evaporator 6 flows, and air passing between the plurality of tubes 25 through the EVA bypass 23. Flows.

  A drain water receiving portion 26 for receiving drain water dripped from the evaporator 6 and guiding it into the tube 25 of the heat exchanger 24 is provided on the upper portion of the heat exchanger 24. The drain water receiving portion 26 is formed so as to expand in a funnel shape upward, and is arranged so that the evaporator 6 is accommodated inside the opening edge of the drain water receiving portion 26 as viewed from above. Further, the downstream side of the air flow of the evaporator 6 in the drain water receiving portion 26 is provided so as to expand toward the downstream side as shown in FIG. 2, and drain water scattered from the evaporator 6 to the downstream side by the air flow as much as possible. The drain water receiving portion 26 is provided.

Here, a large number of drain water dripping holes 27 are provided in the lower surface of the evaporator 6 along the left-right width direction of the evaporator 6, and the drain water dripped from the evaporator 6 is distributed and supplied to a wide range of the heat exchanger 24. It is like that.
On the other hand, a drainage collecting unit 28 that collects drain water that has passed through the tube 25 and guides the collected drain water to the drain port 22 is provided at the lower portion of the heat exchanger 24.

  The drain water receiving unit 26, the heat exchanger 24, and the waste water collecting unit 28 described above may be provided integrally or may be provided separately. Moreover, although the material of the drain water receiving part 26, the heat exchanger 24, and the waste_water | drain collection part 28 is not limited, Metal materials, such as aluminum, copper, and brass excellent in heat conductivity, are desirable. At least the heat exchanger 24 conducts heat for the purpose of increasing the heat exchange efficiency between the drain water and the air passing through the EVA bypass 23 (that is, for the purpose of efficiently providing the cold heat of the drain water to the air passing through the EVA bypass 23). It is desirable to form with the material excellent in property.

The heat exchanger 24 preferably includes fins or unevenness that promote heat exchange between the air passing through the evaporator bypass 23 and the drain water dripped from the evaporator 6.
Specifically, in this embodiment, a corrugated fin (not shown) is arranged between the tube 25 and the tube 25 through which the air passing through the EVA bypass 23 flows, and the cool water of the drain water is efficiently converted into the air passing through the EVA bypass 23. Provided to give. Of course, a large number of irregularities may be provided on the surface of the tube 25 so that the cooling water of the drain water is efficiently given to the air passing through the EVA bypass 23.

On the other hand, the HVAC is provided with an EVA bypass opening / closing door 29 that can open and close the EVA bypass 23. The EVA bypass opening / closing door 29 may be constituted by a plate-shaped door as shown in FIG. 1, or may be other opening / closing means such as a film type door.
The EVA bypass opening / closing door 29 is driven to open and close by a servo motor whose operation is controlled by the air conditioning ECU.

The ECU for air conditioning closes the EVA bypass 23 by the EVA bypass opening / closing door 29 at the time of cooling operation in which rapid cooling is required (for example, when the air conditioning is turned on immediately after parking under hot weather). Thereby, all the air blown into the vehicle interior passes through the evaporator 6, and all the air blown into the vehicle interior is strongly cooled, whereby rapid cooling of the vehicle interior is performed.
On the other hand, the air conditioning ECU opens the EVA bypass 23 by the EVA bypass opening / closing door 29 when it is in an operation state in which energy saving air conditioning is possible (during steady cooling operation) even in a state where the cooling operation is required. As a result, heat is exchanged between the drain water that drops onto the heat exchanger 24 and passes through the tube 25 and the air that passes through the EVA bypass 23, and the air that passes through the EVA bypass 23 is cooled by the drain water. The air cooled by the drain water merges with the air that has passed through the evaporator 6 and is blown out into the vehicle interior to cool the vehicle interior.

  It should be noted that an “eco air conditioning switch” that can be operated by a passenger is provided, and when the air conditioning is selected by the passenger, the EVA bypass 23 may be opened even if the rapid cooling condition is satisfied. good.

(Effect of Example 1)
As described above, in the vehicle air conditioner according to the first embodiment, in the heat exchanger 24 provided immediately below the evaporator 6, air that bypasses the evaporator 6 (air that passes through the evaporator bypass 23) drops from the evaporator 6. Cooled by drained water. In this way, since the cold heat of the drain water that has been discarded in the conventional technique is recovered and blown out into the vehicle interior, it is possible to obtain a greater cooling capacity of air with the same energy consumption as in the conventional technique. That is, the same cooling capacity as that of the conventional technology can be obtained with less energy consumption than that of the conventional technology, and excellent energy saving performance can be exhibited.
Moreover, since the drain water dripped from the evaporator 6 is utilized in the heat exchanger 24 directly under the evaporator 6, a condensate transport structure for guiding the drain water to a remote location is not required. For this reason, the enlargement by using drain water is suppressed, and the cost rise by a condensed water transport structure does not arise.

  The vehicle air conditioner according to the first embodiment can switch between a rapid cooling operation and an energy-saving cooling operation by providing the EVA bypass opening / closing door 29 and controlling the opening and closing of the EVA bypass 23 according to the operation state. This makes it possible to achieve both passenger comfort and energy saving.

  Further, the vehicle air conditioner of the first embodiment is provided with a corrugated fin (not shown) between the tubes 25 and 25 so as to efficiently supply the cooling water of the drain water to the air passing through the EVA bypass 23. It was. Thereby, the cold-heat recovery efficiency of drain water increases, and the temperature of the air which passes the EVA bypass 23 can be lowered | hung. As a result, the energy saving performance using drain water can be further improved.

Here, there is a possibility that rainwater or water during car washing may enter the air conditioning unit 2 through the blower unit 1. The water that has entered from the blower unit 1 side is normally discharged from a drain port 22 provided in the lower part of the evaporator 6.
However, in the vehicle air conditioner of the first embodiment, the heat exchanger 24 is disposed on the upper portion of the drain port 22, and the drain collection part 28 of the heat exchanger 24 is connected to the drain port 22.
Therefore, in the first embodiment, in order to discharge the water that has entered from the blower unit 1 side through the drain port 22, the external port that communicates with the upstream side of the air flow of the heat exchanger 24 in the evaporator bypass 23. An intrusion water discharge gap 30 is provided. With this external intrusion water discharge gap 30, the water that has entered from the blower unit 1 side can be discharged in common with the drain water drain port 22.

Embodiment 2 will be described with reference to FIG. In the second embodiment, the same reference numerals as those in the first embodiment denote the same functional objects.
An idle stop is known in which the engine stops when the vehicle stops. Since the engine is stopped at the idle stop, the operation of the refrigerant compressor driven by the engine stops at the idle stop. Even when an electric compressor is used, in a vehicle with a small battery capacity (a vehicle different from an electric vehicle or a hybrid vehicle), the electric compressor is stopped for the purpose of suppressing the discharge amount of the battery while the vehicle is stopped. There is.
Thus, if the refrigerant compressor stops during idle stop, the cooling operation in which the refrigeration cycle is operated cannot be performed.

In view of this, it is conceivable to use a technique in which the air blower 4 is operated during the idling stop and the comfort of the occupant is maintained by the wind blown from the HVAC.
However, when the wind that has passed through the evaporator 6 is blown into the passenger compartment, the moisture containing the off-flavor components adhering to the surface of the evaporator 6 evaporates and is blown out into the passenger compartment as an air conditioner odor, which is uncomfortable for the passengers. There was a bug that gave.

As means for solving the above problems, the second embodiment employs the following means in addition to the configuration of the first embodiment.
In the cooling part of the HVAC, in addition to the evaporator bypass 23, an evaporator channel 31 through which air passing through the evaporator 6 flows is provided.
The HVAC is provided with an ever open / close door 32 that can open and close the ever flow passage 31. The EVA opening / closing door 32 may be constituted by a plate-like door as shown in FIG. 4, or may be other opening / closing means such as a film type door.
The EVA door 32 is opened and closed by a servo motor whose operation is controlled by an air conditioning ECU.

The air conditioning ECU closes the EVA bypass 23 by the EVA bypass opening / closing door 29 and opens the EVA flow path 31 by the EVA opening / closing door 32 during the cooling operation requiring rapid cooling (during the refrigerant compressor operation). Thereby, all the air blown into the vehicle interior passes through the evaporator 6, and all the air blown into the vehicle interior is strongly cooled, whereby rapid cooling of the vehicle interior is performed.
In addition, even if the air conditioning ECU is in a state where cooling operation is required (during the refrigerant compressor operation), if it enters an operation state in which energy-saving air conditioning is possible (during steady cooling operation), the EVA bypass door 29 opens the EVA bypass. 23 and the evaporative flow path 31 is opened by the elevating door 32. As a result, heat is exchanged between the drain water that drops onto the heat exchanger 24 and passes through the tube 25 and the air that passes through the EVA bypass 23, and the air that passes through the EVA bypass 23 is cooled by the drain water. The air cooled by the drain water merges with the air that has passed through the evaporator 6 and is blown out into the vehicle interior to cool the vehicle interior.

  Further, even when the cooling operation is required, the air conditioning ECU opens the EVA bypass 23 by the EVA bypass opening / closing door 29 and opens / closes the EVA when the refrigerant compressor is stopped by the idle stop. The EVA channel 31 is closed by the door 32. Thereby, only the air which bypassed the evaporator 6 (air without an air-conditioner odor) is blown into the vehicle interior, and the comfort of the passenger is maintained by the blowing.

Note that it is desirable that the air-conditioning during the idling stop in the state where the cooling operation is required increase the air volume by increasing the air volume level by one step from the air volume of the cooling operation while the vehicle is running.
Further, it is desirable that the air-conditioning during idling stop in a state where the cooling operation is required is automatically switched to the inside air circulation to blow the air cooled by the cooling in the passenger compartment.
Furthermore, it is desirable that the air-conditioning during idle stop in a state where the cooling operation is required automatically switches the blowing mode to the face blowing mode and blows air toward the upper body of the occupant.

(Effect of Example 2)
As described above, the vehicle air conditioner according to the second embodiment blows an air flow that does not pass through the evaporator 6 into the vehicle compartment when the refrigerant compressor is stopped and the energy saving operation is performed when the vehicle is stopped (when the vehicle is idle stopped). Implement air conditioning.
For this reason, even at the time of idling stop when the refrigerant compressor stops, passenger comfort can be maintained by air-conditioning by air blowing. Further, since the air flow that does not pass through the evaporator 6 is blown into the vehicle interior, it is possible to prevent the air conditioner odor from being blown into the vehicle interior. That is, even during idling stop, passenger comfort can be ensured by the airflow without the air conditioner odor.

[Modification]
In the above embodiment, as an example of the heat exchange means, an example in which the heat exchanger 24 that performs heat exchange between the drain water and the air passing through the EVA bypass 23 without being touched is shown. On the other hand, you may use the heat exchange means to which drain water and the air which passes the EVA bypass 23 touch.
When a specific example is disclosed, a tray that guides drain water dripped from the evaporator 6 to the drain port 22 at a gentle angle is provided at the lower portion of the evaporator 6, and the drain water flowing through the tray (or the tray cooled by the drain water) is provided. The air passing through the EVA bypass 23 may be cooled by touching the air passing through the EVA bypass 23.
In this case, fins and irregularities may be provided on the tray so as to promote heat exchange between the drain water and the air passing through the EVA bypass 23.

In the above embodiment, the EVA bypass opening / closing door 29 is provided for rapid cooling and the EVA bypass 23 can be closed. However, for the purpose of energy saving and cost reduction, the EVA bypass opening / closing door 29 may be abolished. good.
The technique of eliminating the EVA bypass opening / closing door 29 is a particularly effective technique when the present invention is applied to a stationary air conditioner (indoor air conditioner for home use, business use, etc.) capable of air-conditioning the interior.

It is a schematic block diagram of HVAC (Example 1). (Example 1) which is the principal part enlarged view of FIG. It is explanatory drawing of the heat exchanger provided directly under an evaporator (Example 1). (Example 2) which is a schematic block diagram of HVAC.

Explanation of symbols

6 Evaporator 22 Drain outlet 23 EVA bypass 24 Heat exchanger (heat exchange means)
25 Tube 29 EVA bypass opening / closing door 30 External intrusion water discharge gap 31 EVA flow path 32 EVA opening / closing door

Claims (6)

In an air conditioner that includes an evaporator (6) that cools air toward a room to be air conditioned and is capable of at least cooling operation,
The air conditioner includes an evaporator bypass (23) that flows directly to the room to be air-conditioned while bypassing the evaporator (6), immediately below the evaporator (6).
A heat exchanging means (24) for exchanging heat between the drain water dripped from the evaporator (6) and the air passing through the evaporator bypass (23) is provided immediately below the evaporator (6). Air conditioner. The air conditioner according to claim 1,
The heat exchanging means (24) includes a plurality of tubes (25) which are arranged immediately below the evaporator (6) and through which drain water dripped from the evaporator (6) flows. The tubes (25) It is a heat exchanger (24) through which the air which passes the said EVA bypass (23) flows between. In the air conditioner according to claim 1 or 2,
The heat exchange means (24) is provided with fins or irregularities for promoting heat exchange between the air passing through the evaporator bypass (23) and the drain water dripped from the evaporator (6). apparatus. In the air conditioner in any one of Claims 1-3,
This air conditioner includes an EVA bypass opening / closing door (29) capable of opening and closing the EVA bypass (23), and a control device for controlling the opening degree of the EVA bypass opening / closing door (29) according to the air conditioning state. A featured air conditioner. The air conditioner according to claim 2,
The air conditioner includes a drain port (22) for discharging drain water that has passed through the heat exchanger (24) to the outside immediately below the heat exchanger (24),
The air conditioner characterized in that the drain port (22) communicates with the upstream side of the air flow of the heat exchanger (24) in the EVA bypass (23). In the air conditioner in any one of Claims 1-5,
This air conditioner has an opening / closing door (32) capable of opening and closing an evaporation channel (31) through which air passing through the evaporator (6) flows, and opening control of the evaporation opening / closing door (32) according to the air conditioning state. An air conditioner comprising: a control device that performs the operation.

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