JP3325383B2 - Automotive air conditioners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION An automotive air conditioner according to the present invention is used for air conditioning in a vehicle interior, that is, for cooling, heating and dehumidifying.

[0002]

2. Description of the Related Art Various types of air conditioners for vehicles for performing air conditioning in a vehicle cabin have been known. For example, Japanese Unexamined Utility Model Publication No. 59-169213 discloses an air conditioner for a vehicle having a structure as shown in FIG. The air conditioner for a vehicle shown in FIG. 3 is configured by connecting an intake unit 1, a cooling unit 2, and a heater unit 3 in series with each other. The unit cases 1a, 2a, and 3a constituting the units 1 to 3 collectively constitute a casing 4 of the air conditioner.

[0003] The casing 4 has an inner flow path 5 surrounded by four circumferences, and air for air conditioning can freely flow through the inner flow path 5. Constituting the upstream end of this casing 4,
The unit case 1a of the intake unit 1 has an outside air intake 6 and an inside air intake 7. An intake door 8 is provided in the unit case 1a. The intake door 8 opens one of the air intake ports 6 and 7 at a position indicated by a solid line or a broken line in FIG. A blower 9 is provided in the unit case 1a of the intake unit 1 having such intakes 6, 7,
The air sucked from the air inlets 6 and 7 can be sent to the downstream side of the casing 4.

[0004] An evaporator 10 is provided inside the unit case 2 a of the cooling unit 2, which constitutes an intermediate portion of the casing 4, so as to block the entire inside flow path 5. The evaporator 10 constitutes a vapor compression refrigerator together with a compressor, a condenser, a liquid tank, an expansion valve and the like (not shown), and lowers the temperature by evaporating the refrigerant passing through the expansion valve inside. Then, the air passing through the core portion along the inner flow path 5 from left to right in FIG. 3 is cooled, and at the same time, moisture contained in the air is removed (water vapor is condensed and collected). The refrigerant is fed into the evaporator 10 only when the air conditioner switch is turned on and the compressor is driven.

In the actual case, when the air conditioner switch is turned on, the electromagnetic clutch of the pulley fixed to the drive shaft of the compressor is excited (ON), and the driving force of the engine is transmitted to the compressor. This compressor is driven to send refrigerant to the evaporator 10. When the air conditioner switch is turned off, the electromagnetic clutch is demagnetized (OFF), the driving force of the engine is not transmitted to the compressor, the compressor does not discharge the refrigerant, and the refrigerant is discharged to the evaporator. Feeding stops. That is, the electromagnetic clutch constitutes switching means for switching between sending the refrigerant to the evaporator 10 and stopping the refrigerant. Therefore,
When cooling of the air is not required in winter or the like, the electromagnetic clutch is turned off by the air conditioner switch, and the refrigerant does not flow through the evaporator 10.
The air passing through 0 is not cooled.

Further, a heater core 11 is provided inside the unit case 3a of the heater unit 3, which constitutes a downstream portion from an intermediate portion of the casing 4. The heater core 11 is provided inside the unit case 3a so as to close a part of the inside flow path 5. Therefore, a bypass passage 12 that allows air that does not pass through the heater core 11 to pass is provided on the side of the heater core 11 (upward in FIG. 3). And this bypass passage 1
An air mix door 13 is provided upstream of the heater core 11 and the heater core 11. This air mix door 13
By adjusting the rotation position, the bypass passage 1 can be adjusted.
The ratio between the air passing through 2 and the air passing through heater core 11 is adjusted. The heater core 11 needs to be heated by air, and hot water is supplied only when a hot water cock (not shown) is open. Therefore, when heating of air is not required, such as in summer, the heater core 11
No hot water flows through the heater core 11 and the air passing through the heater core 11 is not heated. These air mix doors 13
And the opening and closing of the hot water cock correspond to the operation position of the temperature control means (switch, lever, etc.) of the control panel provided in the driver's seat, and are performed in relation to the outside air temperature or the like as necessary.

Further, a downstream end of the casing 4 is provided.
At the downstream end of the unit case 3a of the heater unit 3, a defrost opening 14, a foot opening 15, and an upper opening 16 are provided.
And are provided in parallel with each other. The defrost opening 14 communicates with a defroster outlet opening toward the inner surface of the windshield. In addition, the underfoot opening 15 communicates with an underfoot outlet opening at a lower portion in the vehicle interior such as a lower side of the dashboard. Further, the upper opening 16 communicates with an upper outlet, such as a dash panel outlet, which opens at the upper part in the vehicle interior. In addition, first to third mode doors 17 to 19 are provided in the openings 14 to 16, respectively, so that the blowing and stopping of air from the openings 14 to 16 can be controlled. In the downstream end portion of the inner flow path 5, a portion between each of the openings 14 to 16, the heater core 11, and the bypass passage 12 is connected to the mix chamber 20.
And

When the air conditioner constructed as described above is used, the blower 9 is operated and air taken in from outside or inside the vehicle, or outside and inside the vehicle, depending on the position of the intake door 8, is supplied to the inside stream. Send downstream of Road 5. After the air passes through the evaporator 10 and drops in temperature (when a refrigerant is flowing through the evaporator 10), the air flows through the heater core 11 according to the position of the air mixing door 13.
And one or both of the bypass passage 12. When warm water is flowing through the heater core 11 and the air mix door 13 is located at an intermediate position, the heater core 1
The temperature of the air that has passed through
The cold air that has passed through the
Mix in the 0 part. Then, according to the open / close state of the first to third mode doors 17 to 19, the air is blown into the passenger compartment from desired outlets 14 to 16.

In the air conditioner for an automobile, a main body portion which adjusts temperature (furthermore, humidity) by taking in air and further blows out into the vehicle compartment is configured as shown in FIG. Conventionally, a control panel for controlling the operation state has been configured as shown in FIGS. First, in the case of the first example shown in FIG. 4, a fan switch 21, an inside / outside air changeover switch 22, an air conditioner switch 23, a mode switch group 24, and a temperature control lever 25 are provided.

The fan switch 21 is used to adjust the operation speed (rotation speed) of the blower 9 (FIG. 3). For example, as the knob 21a is turned clockwise, the operating speed of the blower 9 increases. The inside / outside air changeover switch 22 is used to change the position of the intake door 8. For example, the intake door 8 (FIG. 3) closes the outside air intake 6 and opens the inside air intake 7 only when the push button constituting the inside / outside air changeover switch 22 is pressed. The air conditioner switch 23 is used to control the ON / OFF state of an electromagnetic clutch attached to the compressor. Also, the temperature control lever 25
Is used to set the target value of the temperature inside the vehicle. For example, the more the lever 25 is located to the right, the higher the target value becomes.

The mode switch group 24 is composed of a plurality of (five in the example shown) push buttons 24a to 24e, and air is blown from any of the outlets by pressing any of the push buttons 24a to 24e. Select whether to blow out. For example, when the push button 24a at the left end in FIG. 4 is pressed, a so-called ventilation mode in which air is blown from an upper outlet is provided. When the next push button 24b is pressed, a so-called bi-level mode, in which cold air is blown from the upper outlet and warm air is blown from the lower outlet, respectively. When the center push button 24c is pressed, the so-called foot mode is set, in which air is blown out from the foot outlet.
When the next push button 24d is pressed, a so-called differential foot mode in which air is blown out from the defrost blowout port and the underfoot blowout port is set. When the right end push button 24e is pressed, air is blown out from the defrost blowout port.
This is a so-called defrost mode.

Next, in the case of the second example shown in FIG. 5, the temperature can be adjusted by the temperature adjusting dial 26 and the mode can be switched by the mode switching dial 27. The configuration and operation other than that the plurality of push buttons or direct-acting levers are replaced with dials are the same as in the first example described above.

Further, in the case of the third example shown in FIG. 6, the position of the intake door 8 (FIG. 3) is adjusted by the inside / outside air switching lever 28. The movement of the inside / outside air switching lever 28 is transmitted to the intake door 8 by a cable (not shown), and changes the position of the intake door 8. For example, when the inside / outside air switching lever 28 is located at the right end in FIG. 6, an outside air intake state is realized, when it is located at the left end, an inside / outside air intake state is realized when it is located at the center, respectively. . The configuration and operation of the other parts are the same as in the above-described second example.

[0014]

However, in the case of the conventional structure configured and operated as described above, from the following circumstances,
Improvement is desired. First of all, there are many switches to be operated and the operation is troublesome. Further, even if the number of switches increases, the space in which the control panel can be installed is limited, so that individual switches are reduced or the interval between adjacent switches is reduced.

[0015] The control panel of the air conditioner for automobiles is
Since the driver sometimes operates during driving, it is preferable that each switch is easy to understand and the operation is simple. In particular, in recent years, the number of drivers, such as the elderly, who have difficulty in seeing a relatively close control panel (because of presbyopia) has been increasing. Realization is desired. The automotive air conditioner of the present invention has been made in view of such circumstances.

[0016]

SUMMARY OF THE INVENTION An air conditioner for a vehicle according to the present invention has a casing through which air for air conditioning can flow, an air intake provided at an upstream end of the casing, and an air intake. An intake door for switching between an outside air intake state in which an opening communicates with the outside of the vehicle and an inside air intake state in which the inside air communicates with the interior of the vehicle; and A blower to be sent downstream, a fan switch for manually adjusting the operation speed of the blower, and a fan switch provided inside the intermediate portion of the casing so as to block the entire inner flow path of the casing, thereby cooling the passing air. An evaporator, a switching means for switching between sending the refrigerant to the evaporator and stopping the refrigerant, and the casing A heater core provided inside the intermediate portion on the downstream side of the evaporator and heating the passing air, a hot water cock for controlling feeding and stopping of hot water to the heater core, and provided at a downstream end of the casing. A foot opening that opens to a foot outlet for blowing air to the lower part of the vehicle compartment, and an upper opening that is provided in parallel with the foot opening at the downstream end of the casing and that blows air to the upper part of the vehicle room. A defrost opening provided at the downstream end of the casing in parallel with the underfoot opening and the upper opening and communicating with a defrost blowout opening opening toward the inner surface of the windshield; and a mode door for controlling a state of air supply to each of these openings. And control means for controlling the switching state of the mode door.

The control means switches the state of the mode door to select one or two openings from which air is blown out of the underfoot opening, the upper opening, and the defrost opening, and at the same time, selects the intake door. And at least the following positions (1) to (3) for switching between the switching state and the ON / OFF state of the air conditioner switch. A first ventilation position in which the intake door is brought into an inside air state, the switching means is brought into a state of sending refrigerant to the evaporator, the defrost opening and the underfoot opening are closed, and only the upper opening is opened. A second ventilation position in which the intake door is in an outside air intake state, the switching means is in a state in which the refrigerant is not sent to the evaporator, the defrost opening and the underfoot opening are closed, and only the upper opening is opened. A bi-level position in which the intake door is in an outside air intake state, the switching means is in a state in which no refrigerant is sent to the evaporator, the defrost opening is closed, and the foot opening and the upper opening are opened. A foot position in which the intake door is in a state of taking in outside air, the switching means is in a state of not sending refrigerant to the evaporator, the defrost opening and the upper opening are closed, and only the foot opening is opened; A differential foot position in which the intake door is in a state of taking in outside air, the switching means is in a state of not sending refrigerant to the evaporator, and the upper opening is closed to open the foot opening and the defrost opening. A defrost position in which the intake door is in an outside air intake state, the switching means is in a state in which the refrigerant is fed into the evaporator, the foot opening and the upper opening are closed, and only the defrost opening is opened.

[0018]

According to the air conditioner for a vehicle of the present invention constructed as described above, if any one of the positions (1) to (4) is simply selected by the control means, the blowout opening for blowing air into the vehicle interior is selected. At the same time, the state of the intake door and the state of sending the refrigerant to the evaporator can be optimized according to the selected blowout opening. Therefore, an air conditioner switch and an inside / outside air changeover switch (or an inside / outside air changeover lever) as in the conventional device are not required. As a result, the control panel of the vehicle air conditioner is easy to see and the operation is easy.

[0019]

FIG. 1 shows a first embodiment of the present invention.
A feature of the present invention is that the state of the intake door 8 and the state of sending the refrigerant to the evaporator 10 are automatically selected according to the selected blowout openings 14 to 16 (see FIG. 3), so that the control panel is controlled. Is simplified. The configuration and operation of the main body of the air conditioner are the same as, for example, the above-described structure of FIG.

The control panel constituting the air conditioner for a vehicle according to the present invention includes a fan switch 21, a mode switching lever 29 constituting control means, and a temperature control lever 25. Neither the inside / outside air changeover switch 22 or inside / outside air changeover lever 28 provided in the case of the conventional structure nor the air conditioner switch 23 (see FIGS. 4 to 6) are provided. The fan switch 21 is used to adjust the operation speed (rotation speed) of the blower 9 (FIG. 3). For example, as the knob 21a is turned clockwise, the operating speed of the blower 9 increases. The temperature control lever 25 is used to set a target value of the temperature inside the vehicle. For example, the more the lever is located to the right, the higher the target value becomes. This point
This is similar to the case of the conventional structure shown in FIG.

In particular, in the case of the vehicle air conditioner of the present invention, by operating the mode switching lever 29, the openings 14 to 16 for blowing air into the vehicle compartment are selected, and at the same time, the inside and outside air by the intake door 8 is controlled. Is controlled, and the supply of the refrigerant to the evaporator 10 (see FIG. 3) or the stop of the supply is controlled. In addition, switching between the intake door 8 and the state of sending the refrigerant in accordance with the selection of the openings 14 to 16 can be easily performed by a simple electric circuit or a microcomputer.

First, when the mode switching lever 29 is moved to the first ventilation position shown in FIG. 1 at the left end in FIG. 1, the intake door 8 enters the inside air intake state. In addition, the switching means enters the refrigerant into the evaporator 10 when the electromagnetic clutch attached to the compressor is excited and the compressor is driven. The first mode door 17 is connected to the defrost opening 14.
The second mode door 18 closes the foot opening 15, and the third mode door 19 opens the upper opening 16.

In this first ventilation position, the casing 4 (FIG. 3)
The air that has been taken into the vehicle and passed through the evaporator 10 and has dropped in temperature blows out into the upper space of the vehicle compartment from an upper outlet provided in a dash panel portion or the like. Therefore, this first ventilation position is useful in a case where the vehicle interior temperature is rapidly lowered. The position of the air mix door 13 and the open / close state of the hot water cock in this state change according to the target value of the vehicle interior temperature determined by the temperature control lever 25. As the target value is higher, the air mix door 13 is displaced in a direction to close the bypass passage 12,
The opening of the hot water cock increases. When the target value is low, the opposite tendency occurs. This point is the same as a conventionally known automotive air conditioner. Further, also in each position described below, the temperature of the air blown out from each of the openings 14 to 16 changes at the position of the temperature control lever 25. Further, the sensible temperature can be adjusted not only by changing the temperature in the vehicle compartment itself by the temperature adjusting lever 25 but also by changing the amount (wind speed) of air blown from each of the openings 14 to 16 by the fan switch 21.

Next, the mode switching lever 29 is
When it is moved to the second ventilation position marked 3 in the figure at the third position from the left, the intake door 8 enters the outside air intake state. Further, the electromagnetic clutch attached to the compressor is demagnetized, and the refrigerant is not sent to the evaporator 10. Also, the first mode door 1
7 closes the defrost opening 14, the second mode door 18 closes the foot opening 15, and the third mode door 1
9 opens the upper opening 16. In this second ventilation position, outside air is introduced into the vehicle interior. That is, this position is useful for ventilating the interior of the vehicle by operating the blower 9 or by using the ram pressure during traveling.

Next, the mode switching lever 29 is
When it is moved to the bi-level position shown in the figure at the center of the above, the intake door 8 enters the outside air intake state. Further, the electromagnetic clutch attached to the compressor is demagnetized, and the refrigerant is not sent to the evaporator 10. Further, the first mode door 17 closes the defrost opening 14, and the second mode door 18 closes the foot opening 15,
Third mode doors 19 open the upper openings 16 respectively. In this bi-level position, the foot opening 1
5, hot air that has passed through the heater core 11 blows out from the upper opening 16, and cool air that has passed through the bypass passage 12 blows out from the upper opening 16.

Next, the mode switching lever 29 is
When the door is moved to the third foot position from the right of the figure, the intake door 8 enters the outside air intake state. Also, the electromagnetic clutch attached to the compressor is demagnetized so that the refrigerant is not sent to the evaporator 10. The first mode door 17 has a defrost opening 14 and the third mode door 19 has an upper opening 16.
Are closed, and the second mode door 18 is
Release 5. In this foot position, the warm air that has passed through the heater core 11 blows out to the lower part of the vehicle compartment, so that rapid heating can be performed.

Next, when the mode switching lever 29 is moved to the differential foot position, which is the second from the right in FIG. 1 and is denoted by the reference numeral in FIG. 1, the intake door 8 enters the outside air intake state. Further, the electromagnetic clutch attached to the compressor is demagnetized, and the refrigerant is not sent to the evaporator 10. Further, the third mode door 19 closes the upper opening 16, the first mode door 17 opens the defrost opening 14, and the second mode door 18 opens the foot opening 15 respectively. In this differential foot position, wind blows to the inside of the windshield and the feet, so that the feet can be warmed and the windshield can be prevented from fogging.

Next, when the mode switching lever 29 is moved to the defrost position indicated by the reference numeral in FIG. 1 at the right end in FIG. 1, the intake door 8 enters the outside air intake state. Further, the electromagnetic clutch attached to the compressor is excited to send the refrigerant to the evaporator 10.
The second mode door 18 closes the foot opening 15, the third mode door 19 closes the upper opening 16, and the first mode door 17 opens the defrost opening 14. In this defrost position, on the inside of the windshield,
Dry air that has passed through the evaporator 10 is blown,
Anti-fog inside the windshield.

Each of the above-mentioned positions is a position that is essential for the automotive air conditioner of the present invention. Further, in the illustrated embodiment, a third ventilation position is provided. That is, when the mode switching lever 29 is moved to the second position from the left in FIG. 1 and is not marked with a circle, the intake door 8 enters the outside air intake state. or,
When the electromagnetic clutch attached to the compressor is excited and the compressor is driven, the switching means enters a state in which the refrigerant is sent to the evaporator 10. Also, the first mode door 17 has the defrost opening 14 and the second mode door 1
8 closes the foot opening 15, respectively, and the third mode door 19 opens the upper opening 16.

In the third ventilation position, the air that has been taken into the casing 4 from outside the cabin by the blower 9 and has passed through the evaporator 10 and has been cooled in temperature passes through the upper outlet provided in the dash panel and the like. Blow out into the upper space of the room. Therefore, this third ventilation position is useful for reducing the temperature in the vehicle interior while ventilating.

The following seven types of positions are arranged as shown in Table 1 below. In Table 1, "VENT" in "MODE" means the ventilation position, "B / L"
Means bi-level position, "FOOT" means foot position, "D / F" means differential foot position, "DE
"F" indicates a defrost position. Further, “REC” in “INTAKE” represents a state of taking in inside air, and “FRE” represents a state of taking in outside air. Further, "ON" in "A / C" indicates a state in which the refrigerant is sent to the evaporator 10, and "OFF" indicates a state in which the refrigerant is not sent.

[0032]

[Table 1]

FIG. 2 shows a second embodiment of the present invention. In the case of the present embodiment, the control means for switching the mode is constituted by the mode switching dial 30, and the mode switching dial 30 allows seven types of positions similar to those of the above-described first embodiment to be freely selected. Further, the temperature control lever 25 (FIG. 1) is omitted, and the temperature of the blown air is changed according to the selected position.

That is, in the present embodiment, in the case of the first, second and third ventilation positions, the air mix door 13 is rotated most counterclockwise in FIG. A full-cool (F / COOL) state is made in which all of the drawn air passes through the bypass passage 12. Further, in the case of the foot position, the differential foot position, and the defrost position, the air mix door 13 is moved to the position shown in FIG.
To make a full hot (F / HOT) state in which all the air passing through the evaporator 10 passes through the heater core 11 through which the hot water flows. Further, in the case of the bi-level position, the air mix door 1 is used.
3 is stopped at the intermediate position, and the blown air temperature is set to an intermediate value between the full cool and the full hot so as to be in a half (1/2) state. In this half state, the upper part, the feet,
6 and 15 (FIG. 3) are open, the relatively low-temperature air that has passed through the bypass passage 12 (FIG. 3) to the upper opening 16 and the heater core 11 (FIG. 3) that has passed through the foot opening 15 High-temperature air is easy to flow into each. The following Table 2 summarizes seven types of positions in this embodiment.

[0035]

[Table 2]

As described above, the feature of the present invention is that the state of the intake door 8 and the state of sending the refrigerant to the evaporator 10 are automatically selected according to the selected blowout openings 14 to 16. The point is that the control panel is simplified. The configuration of the main body of the air conditioner is not limited to the structure shown in FIG. 3, and other conventionally known structures can be adopted. For example, FIG. 7 shows another example of a conventionally known automotive air conditioner called a full reheat type. In the case of this structure, similarly to the evaporator 10, the heater core 11 is disposed at right angles to the air flow direction (the left-right direction in FIG. 7), and a door 31 that opens and closes the bypass passage 12 is provided. In the case of this structure, the temperature of the blown air is adjusted by the opening and closing of the door 31 and the amount of hot water sent to the heater core 11. The present invention is also applicable to an air conditioner for a vehicle having a main body having such a structure.

[0037]

The vehicle air conditioner of the present invention is constructed and operates as described above. However, the number of operation switches provided on the control panel can be reduced, and the number of operation switches can be increased if necessary. The control panel is easy to see and easy to operate. Further, the cost can be reduced by reducing the number of switches.

[Brief description of the drawings]

FIG. 1 is a front view of a control panel showing a first embodiment of the present invention.

FIG. 2 is a front view of a control panel showing the second embodiment.

FIG. 3 is a schematic longitudinal sectional side view showing an example of a structure of a main body portion of an automotive air conditioner to which the present invention is applied.

FIG. 4 is a front view showing a first example of a conventionally known control panel.

FIG. 5 is a front view showing the second example.

FIG. 6 is a front view showing the third example.

FIG. 7 is a schematic vertical side view showing another example of the structure of the main body of the air conditioner for a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake unit 1a Unit case 2 Cooling unit 2a Unit case 3 Heater unit 3a Unit case 4 Casing 5 Inside flow path 6 Outside air intake 7 Inside vehicle air intake 8 Intake door 9 Blower 10 Evaporator 11 Heater core 12 Bypass passage 13 Air mix door 14 Defrost opening 15 Underfoot opening 16 Upper opening 17 First mode door 18 Second mode door 19 Third mode door 20 Mix chamber 21 Fan switch 21a Knob 22 Inside / outside air changeover switch 23 Air conditioner switch 24 Mode switch group 24a to 24e Push button 25 Temperature control lever 26 Temperature control dial 27 Mode switching dial 28 Inside / outside air switching lever 29 Mode switching lever 30 Mode switching dial 3 1 door

Claims (1)

(57) [Claims] 1. A casing through which air for air conditioning can flow, an air intake port provided at an upstream end of the casing, and an outside air intake state in which the air intake port is connected to the outside of the vehicle. An intake door for switching to an inside air intake state to be communicated, a blower provided inside the upstream end portion of the casing, for sending air sucked from the air intake to the downstream side of the casing, and an operation speed of the blower manually. A fan switch for adjusting the pressure, an evaporator provided inside the intermediate portion of the casing so as to close the entire inner flow path of the casing, and cooling the passing air; and sending and stopping the refrigerant to the evaporator. Switching means for switching between the evaporator and a downstream side of the evaporator inside the intermediate portion of the casing. A heater core for heating the passing air, a hot water cock for controlling the supply of hot water to the heater core, and a stop therefor; a foot blowout provided at a downstream end of the casing and blowing out air to a lower portion of the vehicle compartment. An underfoot opening leading to the mouth, an upper opening provided in parallel with the underfoot opening at the downstream end of the casing, and leading to an upper outlet for blowing air to the upper part of the vehicle compartment, and a underfoot opening at the downstream end of the casing; A defrosting opening provided in parallel with the upper opening and leading to a defrosting outlet opening toward the inner surface of the windshield; a mode door for controlling a state of air supply to each of the openings; and a mode door for controlling a switching state of the mode door. Control means for switching the state of the mode door, and opening the lower opening, the upper opening, and the differential. A vehicle having at least the following positions to select one or two openings from which air is blown out of the strike openings and to switch the intake door switching state and the air conditioner switch ON / OFF state at the same time. Air conditioner. A first ventilation position in which the intake door is brought into an inside air state, the switching means is brought into a state of sending refrigerant to the evaporator, the defrost opening and the underfoot opening are closed, and only the upper opening is opened. A second ventilation position in which the intake door is in an outside air intake state, the switching means is in a state in which the refrigerant is not sent to the evaporator, the defrost opening and the underfoot opening are closed, and only the upper opening is opened. A bi-level position in which the intake door is in an outside air intake state, the switching means is in a state in which no refrigerant is sent to the evaporator, the defrost opening is closed, and the foot opening and the upper opening are opened. A foot position in which the intake door is in a state of taking in outside air, the switching means is in a state of not sending refrigerant to the evaporator, the defrost opening and the upper opening are closed, and only the foot opening is opened; A differential foot position in which the intake door is in a state of taking in outside air, the switching means is in a state of not sending refrigerant to the evaporator, and the upper opening is closed to open the foot opening and the defrost opening. A defrost position in which the intake door is in an outside air intake state, the switching means is in a state in which the refrigerant is fed into the evaporator, the foot opening and the upper opening are closed, and only the defrost opening is opened.