JP2001287534A - Vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of a cool differential phenomenon, in a vehicular air conditioner wherein a blowing out mode to a vehicular interior is shifted by a rotary door. SOLUTION: A foot blowing out opening portion 23 and a defroster blowing out opening portion 22 are opened/closed by rotating displacement of a door actuating surface 20b of the rotary door 20. An auxiliary communicating hole 20e is provided on the door actuating surface 20b, which makes a part of warm air toward the foot blowing out opening portion 23 branch off when selecting a blowing out mode simultaneously opening both blowing out opening portions 22, 23 by the rotary door 20. A guiding passage 30 is provided on the foot blowing out opening portion 23, which guides the warm air passing though the auxiliary opening portion 20e to the defroster blowing out opening portion 22 side. Thereby, a part of the warm air towards the foot blowing out opening portion 23 is certainly guided to the defroster blowing out opening portion 22 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle in which a mode for blowing air into a passenger compartment is switched by a rotary door.

[0002]

2. Description of the Related Art Conventionally, as a blowout opening of a vehicle air conditioner, there are a face blowout opening for blowing conditioned air toward the occupant head, and a foot blowout opening for blowing conditioned air toward the foot of the occupant. A defroster blowing opening for blowing conditioned air toward the inner surface of the vehicle front window glass.

[0003] The plurality of outlets are selectively opened and closed by appropriate door means to switch the mode of blowing into the vehicle compartment. When a normal plate door is used as the blow mode switching door means, a plurality of plate doors are required and a connecting mechanism of the plurality of plate doors is required, so that the configuration is complicated and the door installation is difficult. The required space becomes larger.

In view of the above, there has been conventionally proposed a method in which a plurality of blowout openings are switched and opened and closed by a single rotary door, thereby simplifying the blowout mode switching mechanism and saving space. Here, the rotary door has a structure in which a rotating shaft and a door operating surface (usually an arc shape) extending in a rotating direction about the rotating shaft are integrally connected, and the rotary door blows out due to the rotational displacement of the door operating surface. Open and close the opening.

[0005]

However, an air conditioner for a vehicle having a blow-out mode switching mechanism using a rotary door is actually manufactured on a trial basis and experimentally examined.
In a blow mode in which air is blown into the vehicle compartment from both the foot blow opening and the defrost blow opening, specifically, in the foot mode, a so-called cool differential in which the defrost blow temperature is extremely lower than the foot blow temperature. It turns out that a phenomenon occurs.

[0006] Due to the occurrence of the cool differential phenomenon, the temperature of the window glass on the front of the vehicle is lowered, the anti-fog performance is lowered, and fogging of the window glass is easily caused. According to the study of the present inventors, it has been found that this Cool Def phenomenon occurs for the following reason.

That is, FIG. 6 shows a prototype (not known) of the present inventors, and is a view for explaining the above-mentioned Cool Def phenomenon. In the foot mode, the foot blowing air volume is usually 80%, and the defroster blowing air volume is normally used. Is set to about 20%. Therefore, the door operating surface 20 of the rotary door 20 is compared with the opening area of the communication portion a2 between the communication hole 20d of the door operating surface 20b of the rotary door 20 and the foot opening 23.
The opening area of the communication part a1 between the communication hole 20d of b and the defroster blowing opening part 22 is made sufficiently small.

[0008] Here, the rotary door 20 is disposed above the heat exchanger 14 for heating.
Communication part a2 between the communication hole 20d and the foot outlet opening 23
Is located below the communication portion a1 between the communication hole 20d of the rotary door 20 and the defroster outlet opening portion 22 and approaches the outlet side of the heating heat exchanger 14. From the positional relationship of the communication part of the rotary door 20, the main flow of the hot air B on the outlet side of the heating heat exchanger 14 is
Then, the air flows into the foot outlet 23 through the communication hole 20d.

On the other hand, the cool air that has passed through the bypass passage 15 of the heating heat exchanger 14 flows through the warm air indicated by arrows B and C as indicated by arrows D and E, and the door operating surface 20b of the rotary door 20 is moved.
The cold air D, E flows along the inner wall surface of the door operating surface 20b of the rotary door 20, passes through the communication portion a1 of the rotary door 20, and flows into the defroster outlet opening 22.

Here, the communication hole 20d of the rotary door 20 is provided.
In addition to the small opening area of the communication part a1 between the cooling air flow D and the defroster blowing opening 22 as described above,
The presence of E prevents the warm air from flowing into the defroster outlet opening 22. As a result, almost only the cool air flows into the defroster outlet 22 and the cool differential phenomenon occurs.

[0011] The present invention has been made in view of the above points,
An object of the present invention is to suppress the occurrence of a cool differential phenomenon in a vehicle air conditioner in which a mode of blowing into a vehicle compartment is switched by a rotary door.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, a rotary shaft (20a) is provided.
A rotary door (20) integrally formed with a door operating surface (20b) extending in the direction of rotation about the rotation axis (20a); a foot outlet opening (23) and a defroster outlet opening (22); ), The rotary door (20)
Is opened and closed by the rotational displacement of the door operating surface (20b). Further, when a blowing mode in which both the blowing openings (22, 23) are simultaneously opened by the rotary door (20) is selected, heating for heating is performed. A hot air guide section (20e, 30) is provided for branching a part of the hot air from the outlet side of the heat exchanger (14) toward the foot outlet opening (23) and guiding it to the defroster outlet opening (22) side. It is characterized by the following.

[0013] This ensures that a portion of the warm air flowing toward the foot outlet opening (23) is reliably removed from the defroster outlet opening (2).
2) It can be introduced to the side to suppress the occurrence of the cool differential phenomenon, and the anti-fog performance of the window glass can be secured.

According to a second aspect of the present invention, in the first aspect, the guide passage (30) for guiding a portion of the warm air to the defroster outlet opening (22) through the foot outlet opening (23).
And a main communication hole (20d) for simultaneously opening the two outlet openings (22, 23) on the door operating surface (20b) of the rotary door (20); and the two outlet openings (22). , 23) at the time of simultaneous opening of the guide passage (30)
An auxiliary communication hole (20e) communicating with the guide passage (3).
0) and the auxiliary communication hole (20e) constitute a hot air guide portion.

Thus, by providing the auxiliary communication hole (20e) on the rotary door (20) side and the guide passage (30) on the foot outlet opening (23) side, respectively, the foot outlet opening (23) is provided. Part of the warm air flowing can be reliably introduced into the defroster outlet opening (22) side.

According to a third aspect of the present invention, in the first or second aspect, in the blow mode, the amount of air blown from the defroster air blow opening (22) is reduced, and the amount of air blown from the foot air blow opening (23) is reduced. This is the foot mode in which the amount is large, and in the blowing mode other than the foot mode, the hot air guide (2
0d, 30) is always in a cutoff state.

Thus, in the foot mode in which the amount of air blown out by the defroster is small and the cool differential phenomenon is likely to occur, a part of the warm air directed to the foot outlet opening (23) can be branched to suppress the cool differential phenomenon. In the blowout mode, the introduction of warm air into the defroster blowout opening (22) is stopped, thereby preventing the adverse effects caused by the introduction of warm air.

If the hot air guides (20d, 30) are arranged substantially at the center of the rotary door (20) in the axial direction as in the invention according to claim 4, the defroster outlet opening (22).
Mixing of cold and hot air is performed at a substantially central portion on the downstream side, so that the temperature distribution of the defroster blowout air is easily made uniform.

In the fifth aspect of the present invention, the foot outlet opening (23) and the defroster outlet opening (22) are
The rotary door (20) is disposed adjacent to the outer peripheral side of the door operating surface (20b) in the rotational direction, and the foot outlet opening (23) has a heating heat exchanger (14) larger than the defroster outlet opening (22). A bypass passage (15) is provided adjacent to the outlet side of the heating heat exchanger (14), and the bypass passage (15) through which the cool air flows bypasses the heating heat exchanger (14), from the outlet side of the heating heat exchanger (14). The cool air from the bypass passage (15) is pressed against the inner wall surface side of the door operating surface (20b) by the warm air heading toward the foot outlet opening (23) and heads toward the defroster outlet opening (22). .

As described above, in the case where the cool air from the bypass passage (15) is pressed against the inner wall surface of the door operating surface (20b) by the warm air and directed toward the defroster outlet opening (22), the cool differential is provided. The phenomenon is easy to occur. However, even in such an arrangement layout, the cool air diffusing phenomenon can be satisfactorily suppressed by the hot air guiding action to the defroster blowing opening (22) based on the configuration of claims 1 to 4.

According to the sixth aspect of the present invention, the heating heat exchanger (14) is disposed substantially horizontally so that the conditioned air passes vertically through the heat exchanging portion.
The rotary door (20) is arranged above the item (4).

According to this, by arranging the rotary door (20) above the heating heat exchanger (14) arranged substantially horizontally, the required space in the vehicle front-rear direction is reduced, and a compact air conditioning unit is constituted. it can.

According to the seventh aspect of the present invention, the rotary shaft (20
a) and a rotary door (20) integrally connected to a door operating surface (20b) extending in the direction of rotation about the rotation axis (20a), and a plurality of outlet openings (21) into the vehicle interior.
To 23) are opened and closed by the rotational displacement of the door operating surface (20b), a foot opening opening (23) for blowing out conditioned air at least toward the feet of the occupant, as a blowing opening, and a vehicle window glass. A defroster blowout opening (22) for blowing conditioned air toward the inner surface of the door, and further, when a blowout mode in which both the blowout openings (22, 23) are simultaneously opened by the rotary door (20) is selected, An auxiliary communication hole (20e) for branching a part of the warm air toward the blowout opening (23) is formed on the door operating surface (20).
b), and a guide passage (3) for guiding the warm air passing through the auxiliary opening (20e) to the defroster blowing opening (22) side.
0) is provided in the foot outlet opening (23).

According to this structure, a part of the warm air flowing toward the foot outlet opening (23) is surely introduced into the defroster outlet opening (22) side to reduce the cool differential phenomenon. Can be suppressed.

The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiments described later.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an air conditioning unit of an indoor unit of a vehicle air conditioner, and FIG. 2 is a schematic plan view of the air conditioning unit. 3 and 4 show specific examples of the main part of the present invention.

The indoor unit of the vehicle air conditioner is roughly divided into a blower unit (not shown) and an air conditioner unit 10. The blower unit is arranged from the center of the instrument panel at the front of the passenger compartment to the passenger seat side. It is arranged at an offset position (offset to the left in the vehicle width direction for right-hand drive vehicles). On the other hand, the air conditioning unit 10 is disposed at the center of the instrument panel in the vehicle width direction. Arrows in FIGS. 1 and 2 indicate front, rear, up, down, left, and right directions when the vehicle is mounted.

The blower unit is provided with an inside / outside air switching box for switching and introducing between the vehicle interior air and the vehicle outside air at an upper portion thereof, and a blower is disposed below the inside / outside air switching box. Centrifugal multi-blade fan (Sirocco fan)
And a motor for driving the fan.

On the other hand, the air-conditioning unit 10 has a resin-made air-conditioning case 11 forming an air passage. The air-conditioning case 11 is formed into a substantially box-like shape as a whole, and is divided into a plurality of case bodies for accommodating devices described below, and the divided case bodies are integrally connected. .

An air inlet 12 is provided at a lower portion of the side of the air-conditioning case 11 facing the blower unit, and air blown from the blower unit is supplied from the air inlet 12 to the evaporator 13 in the air-conditioning case 11. It is introduced into the lower space. The evaporator 13 is a cooling heat exchanger that cools the blown air by evaporating the low-pressure refrigerant of the refrigeration cycle and absorbing heat from the blown air.

Since the evaporator 13 is installed in a substantially horizontal state below the air conditioning case 11, the air inlet 12
Flows through the heat exchange section of the evaporator 13 from below to above.

In the air-conditioning case 11, a heater core 14 is installed in a substantially horizontal state on the downstream side (upper side) of the evaporator 13 in the air. This heater core 14
Hot water (engine cooling water) from a vehicle engine (not shown)
Is a heating heat exchanger for heating the blown air by using the heat source as a heat source, and is disposed in the air conditioning case 11 so as to be biased toward the vehicle front side. As a result, a first bypass passage 15 through which the cool air flows bypassing the heater core 14 is formed on the vehicle rear side of the heater core 14.

The first bypass passage 15 has a plate-shaped first
The bypass door 16 is provided so as to be rotatable by a rotating shaft 16 a, and the opening degree (opening area) of the first bypass passage 15 is adjusted by the first bypass door 16.

The heater core 14 has a core portion 14a in which a number of flat tubes made of aluminum are laminated and aluminum corrugated fins are arranged between the tubes.
And aluminum tank portions 14b and 14 disposed at both ends in the longitudinal direction of the tube (in this example, the vehicle longitudinal direction).
c, and the whole has a thin rectangular shape.

In the heater core 14 of this embodiment, the hot water inlet side tank 14b is located on the rear side of the vehicle so as to be adjacent to the first bypass passage 15, and the hot water outlet side tank 14c is located on the vehicle front side. Accordingly, the heater core 14 is a one-way flow type (all-pass type) in which warm water flows from the inlet side tank 14b in one direction from the vehicle rear side to the vehicle front side toward the outlet side tank 14c through all the flat tubes of the core portion 14a. It is configured.

Then, hot water (engine cooling water) from the vehicle engine flows into the inlet side tank 14b of the heater core 14 through the hot water inlet pipe 17 and the hot water valve 18.
The hot water that has passed through the core portion 14a of the heater core 14 is drawn into the water pump (not shown) of the vehicle engine from the outlet tank 14c through the hot water outlet pipe 18.

The hot water valve 18 adjusts the flow rate of the hot water flowing into the heater core 14 by adjusting the opening degree (opening area) of the hot water passage. The hot water valve 18 controls the flow rate of the hot water and the first bypass. The temperature of the air blown into the vehicle interior is adjusted in combination with the adjustment of the opening degree of the first bypass passage 15 by the door 16.

In the air conditioning case 11, the heater core 1
The rotary door 20 is rotatably arranged on the downstream side (upper side) of the air 4. The rotary door 20 plays a role as an air outlet mode switching door for switching an air outlet portion (air outlet mode) of the conditioned air into the vehicle interior.

The rotary door 20 has a rotating shaft 20a disposed at both ends in the axial direction, a door operating surface 20b forming an arc-shaped circumferential wall extending in the rotating direction about the rotating shaft 20a, and a fan-shaped rotary door 20a. And the connecting plate 20c.
The connecting plate 20c connects both ends of the door operating surface 20b in the axial direction to the rotating shaft 20a. In this example, the rotary shaft 20a, the door operating surface 20b, and the connecting plate 20c of the rotary door 20 are integrally formed of resin, and the entire shape of the rotary door 20 is substantially semi-cylindrical (see FIG. 4). In addition, W in FIG. 2 indicates a width dimension of the entire rotary door 20.

Rotary shafts 2 at both axial ends of rotary door 20
Oa is rotatably supported by a bearing hole (not shown) of the air conditioning case 11. One of the rotating shafts 20a at both ends is connected to a drive mechanism by a servomotor or a manual operation mechanism operated by an occupant, and the rotary door 20 is rotated by these mechanisms.

The inner space between the door operating surface 20b of the rotary door 20 and the connecting plate 20c is always in communication with the downstream side of the heater core 14 in the air. At a predetermined position in the circumferential direction of the door operation surface 20b, a main communication hole 20d that communicates the inside and outside of the door operation surface 20b is formed. The main communication hole 20d is formed in the shape of a long hole in the circumferential direction as illustrated in FIG. 4, and the length of the main communication hole 20d in the circumferential direction (the long-axis direction dimension of the long hole) is determined by a foot described later. , Defroster outlet openings 22, 23
Is set to a predetermined size that can be fully opened.

Specifically, the main communication hole 20d is formed by being divided into a plurality of parts (four parts a to d in the examples of FIGS. 2 and 4) in the axial direction of the rotary door 20. An auxiliary communication hole 20e is formed at a central portion in the axial direction (an intermediate position between the plurality of main communication holes 20d). The circumferential length of the auxiliary communication hole 20e is sufficiently smaller than the main communication hole 20d. This auxiliary communication hole 20e is the main communication hole 20e.
It is formed closer to the foot outlet opening 23 side (right end side in FIGS. 3 and 4) of the circumferential length of d.

In the air conditioning case 11, the rotary door 2
On the upper side of the rotary door 20, three blowout openings 21, 22, and 23 are provided in an area where the rotary door 20 rotates.
Are formed adjacent to each other along the rotation direction (circumferential direction). The distal ends of the case partition walls 24 to 27 forming the three blowout openings 21, 22, and 23 are attached to the rotary door 2.
The door operation surface 20b having a zero arc shape slides.

Of the three blowout openings 21, 22, and 23, the face blowout opening 21 located closest to the vehicle rear side.
Communicates with a face outlet (not shown) that blows air toward an upper side (occupant head side) in the vehicle interior. Also,
The defroster blowout opening 22 located in the middle between the three blowout openings 21, 22, and 23 in the front-rear direction of the vehicle communicates with a defroster blowout (not shown) that blows air toward the inside of the vehicle front window glass. are doing.

Of the three blowout openings 21, 22, and 23, the foot blowout opening 23 located at the most front side of the vehicle is a foot air passage 28 that hangs down along the outer surface of the air conditioning case 11 on the front side of the vehicle. And a foot duct 29 connected to the passage 28. The air is blown out from the foot outlet 29a at the lower end of the foot duct 29 toward the feet of the occupant.

In accordance with the rotational position of the rotary door 20, five blow modes can be selected as shown in FIG. More specifically, as the blowing mode, a face mode in which only the face blowing opening 21 is opened, a bi-level mode in which both the face blowing opening 21 and the foot blowing opening 23 are almost half-opened, and a foot blowing opening 23 is fully opened. A foot mode in which a small amount of the defroster outlet opening 22 is opened, a foot differential mode in which both the defroster outlet opening 22 and the foot opening 23 are substantially half-opened, and a defroster mode in which only the defroster outlet opening 22 is opened can be selected.

As shown in FIGS.
1, the rotary door 20 is provided at the axial center of the rotary door 20 in the portion where the foot outlet opening 23 is formed.
A guide passage 30 for guiding the warm air from the auxiliary communication hole 20e to the defroster outlet opening 22 side is formed. The guide passage 30 is separated from a surrounding passage of the foot outlet 23 by a partition wall 31.

The door operating surface 2 of the guide passage 30
An entrance hole 30a is opened at a site opposing Ob. When the rotary door 20 is rotated clockwise from the position shown in FIG.
The auxiliary communication hole 20e communicates with the entrance hole 30a of the guide passage 30. Exit hole 30b of guide passage 30
Is always connected to the downstream side of the defroster outlet 22 through the hot air passage 32.

In this embodiment, when the rotary door 20 is at a position other than the foot mode, the door operating surface 20b
Thereby, the inlet hole 30a is shut off.

On the other hand, the rotary door 20 is connected to the heater core 14.
, The second bypass passage 33 is provided on the side of the rotary door 20 (on the rear side of the vehicle).
Is formed. The second bypass passage 33 directly connects the downstream side of the air of the first bypass passage 15 to the downstream passage 34 of the face outlet 21 by bypassing the rotary door 20 and the face outlet 21.

In the second bypass passage 33, a plate-shaped second bypass door 35 is provided rotatably by a rotating shaft 35a, and the second bypass passage 33 is opened and closed by the second bypass door 35. . The first bypass door 16, the hot water valve 18, and the second bypass 33 are operated in conjunction with each other by a drive mechanism using a servomotor or a manual operation mechanism operated by an occupant.

Next, the operation of the present embodiment based on the above configuration will be described. The air flows into the lowermost part in the case 11 of the air conditioning unit 10 by the operation of the blower of the blower unit (not shown). The inflow air is cooled and dehumidified by the evaporator 13 when passing through the evaporator 13 from below to above. Thereafter, the air is heated by the heater core 14 and, after the temperature is adjusted, passes through the outlet openings 21 to 23 selected by the rotary door 20 and is blown into the vehicle interior.

The temperature of the air blown into the vehicle cabin is adjusted as follows.
The operation is performed by operating the hot water valve 18 and the first bypass door 16 based on a manual operation of a blown air temperature setting member (not shown) provided on the air conditioning operation panel. Specifically, the hot water valve 18 is fully closed at the maximum cooling position (lowest temperature position) of the operation range of the temperature setting member, and is fully opened at the maximum heating position (highest temperature position). Further, when the outlet air temperature setting member is operated from the maximum cooling position to the maximum heating position, the opening degree (opening area) of the hot water valve 18 gradually increases, and the flow rate of the hot water passing through the hot water valve 18 gradually increases. It is.

Further, the first bypass door 16 is in the fully closed state of the first bypass passage 15 in the maximum heating position of the temperature setting member, and the first bypass door 16 is in the second closed position until the temperature setting member is operated from the maximum heating position to the predetermined intermediate position. The 1 bypass passage 15 is kept in a fully closed state. When the temperature setting member reaches the predetermined intermediate position, the first bypass door 16 starts to open. When the temperature setting member is operated from the intermediate position toward the maximum cooling side, the opening degree of the first bypass door 16 ( The opening area of the first bypass passage 15) increases linearly, and the opening characteristic is such that the first bypass door 16 fully opens the first bypass passage 15 near the maximum cooling position of the temperature setting member 3.

On the other hand, the second bypass door 35 fully opens the second bypass passage 33 in the vicinity of the maximum cooling position of the temperature setting member to increase the amount of face blown air. Then, when the temperature setting member 3 is operated from the maximum cooling position to the temperature control range, the second bypass door 35 shifts to the fully closed state of the second bypass passage 33.

Next, the behavior of the upper and lower outlet temperature difference in the foot mode, which is a feature of the present invention, will be described in detail. In the foot mode, the rotary door 20 is rotated to the position shown in FIGS. 1 and 3, and the main communication hole 20d of the rotary door 20 communicates with the defroster blowout opening 22 with a small opening (see the communication part a1 in FIG. 1). The main communication hole 20d communicates with the foot outlet 23 with a large opening (see the communication part a2 in FIG. 1). At this time, the face blowing opening 21
Is completely closed by the wall of the door operating surface 20b.

By setting the degree of opening of the communication part a1 <the degree of opening of the communication part a2, normally, in the foot mode, the amount of air blown out by the defroster is about 20% and the amount of air blown out by the foot is about 80%. Further, since the foot outlet opening 23 is arranged closer to the outlet side of the heater core 14 than the defroster outlet opening 22, the warm air B passing through the heater core 14 flows inside the rotary door 20 as shown by an arrow C. , Main communication hole 20d
Through the communication portion a2 with the large opening of the foot outlet opening portion 23
Flows towards

At this time, when the first bypass door 16 has opened the first bypass passage 15 by a small opening for the purpose of adjusting the blowout temperature, the cool air passes through the first bypass passage 15 as shown by the arrow D. The cool air D is pushed by the flow of the warm air B and C toward the foot outlet 23 and flows along the inner wall surface of the door operating surface 20b of the rotary door 20 as shown by the arrow E, and thereafter, the cool air D and E Mostly flows into the defroster outlet opening 22 through the communication portion a1 of the main communication hole 20d having a small opening degree.

However, according to the present embodiment, in the foot mode, the auxiliary communication hole 20e provided in the door operating surface 20b of the rotary door 20 is provided in the entrance hole 30a of the guide passage 30 provided in the area where the foot outlet opening 23 is formed. Communicate. Therefore, a part of the warm air is diverged from the warm air B and C heading toward the foot outlet 23 as shown by the arrow F, and the auxiliary communication hole 20 is opened.
e, it flows into the guide passage 30 through the entrance hole 30a.

Since the guide passage 30 is separated from the passage of the surrounding foot opening 23 by the partition wall 31,
The warm air F in the guide passage 30 flows from the outlet hole 30b through the warm air passage 3
2 and flows downstream of the defroster outlet 22. Here, the hot air F and the cold air D and E are mixed, and the conditioned air having a predetermined temperature due to the mixing flows toward the defroster outlet.

As described above, even in the foot mode, even when a phenomenon occurs in which only the cool air D and E flows in the small opening degree communication portion a1 of the main communication hole 20d which is the original air inflow passage for the defroster outlet opening portion 22, A part of the warm air B and C heading toward the foot outlet opening 23 can be branched, and the branched warm air can reliably flow downstream of the defroster outlet opening 22.

Therefore, it is possible to prevent the cool differential phenomenon in which the temperature of the defroster blown air drops extremely, and it is possible to maintain the defroster blown air temperature at a predetermined temperature or more even in the foot mode, thereby ensuring good anti-fogging property.

In the foot differential mode, the main communication hole 2
Since 0d is simultaneously opened with substantially the same opening degree to the defroster outlet opening 22 and the foot outlet opening 23, the defroster outlet air volume and the foot outlet air volume are substantially the same. Along with this, the warm air on the outlet side of the heater core 14 easily flows into the defroster outlet opening 22, so that the cool differential phenomenon hardly occurs.

Therefore, in the present embodiment, when the rotary door 20 rotates counterclockwise from the rotation position in the foot mode in the foot differential mode and reaches the rotation position in the foot differential mode, the auxiliary communication hole in the door operating surface 20b is provided. 20e moves away from the entrance hole 30a of the guide passage 30 on the side of the foot outlet opening 23, and the wall of the door operating surface 20b closes the entrance hole 30a.

That is, in the foot differential mode, the introduction of the warm air F from the auxiliary communication hole 20e through the guide passage 30 to the defroster outlet 22 is stopped. In the other defroster, bi-level, and face blowout modes, the inlet hole 30a remains closed by the wall of the door operating surface 20b.

(Other Embodiments) The present invention can be variously modified as described below without being limited to the above-described embodiment.

In the above-described embodiment, the case where the introduction of warm air from the auxiliary communication hole 20e through the guide passage 30 to the defroster outlet 22 is stopped in the foot differential mode has been described. Even in the foot differential mode, the cool differential phenomenon may easily occur due to a change in the layout design, a change in the defroster blowout air volume and the foot blowout air volume in the foot differential mode, and the like. In such a case, in the foot differential mode in addition to the foot mode, warm air may be introduced into the defroster outlet 22 through the guide passage 30 from the auxiliary communication hole 20e.

In the above-described embodiment, the adjustment of the flow rate of hot water to the heater core 14 by the hot water valve 18 and the adjustment of the cool air flow rate of the heater core by the first bypass door 16 are used to adjust the temperature of the air blown into the vehicle cabin. However, the present invention may be applied to a well-known air mix system in which the ratio of the amount of warm air passing through the heater core and the amount of cool air bypassing the heater core is adjusted by an air mix door.

In other words, even in the air mix system, only the heater core bypass cold air may flow into the defroster outlet opening 22 in the foot mode to cause a cool differential phenomenon. Therefore, the present invention can be applied to prevent the cool differential phenomenon.

The first bypass door 16 and the first bypass passage 15 are eliminated, and the present invention is applied to a temperature adjustment system in which the temperature of the air blown into the vehicle compartment is adjusted only by adjusting the flow rate of hot water to the heater core 14 by the hot water valve 18. May be applied.

That is, as the heater core 14, a one-way flow type (all-pass type) in which warm water flows in one direction from the above-described inlet side tank 14b through all the flat tubes of the core portion 14a toward the outlet side tank 14c. 1 and the inlet-side tank 14b of the heater core 14 is arranged on the side of the foot outlet opening 23 opposite to FIG. 1, and the outlet-side tank 14c is arranged on the side of the face outlet opening 21.
In the minute hot water flow rate range where the hot water flow rate is reduced by the hot water valve 18,
The temperature of the air blown out of the heater core 14 drops significantly from the inlet side tank 14b to the outlet side tank 14c.
Therefore, only the low-temperature blown air on the outlet side tank 14c side of the heater core 14 may flow into the defroster blowout opening 22 to cause a cool differential phenomenon. Therefore, the present invention can be applied to prevent the cool differential phenomenon.

In the above embodiment, the rotary door 2
The auxiliary communication hole 20e is provided at one position in the center of the axis 0 in the axial direction.
The guide passage 30 and the hot air passage 32 are formed at one central portion in the axial direction in correspondence with the auxiliary communication holes 20.
e, the guide passage 30 and the hot air passage 32 may be provided at a plurality of positions in the axial direction of the rotary door 20.

In the above embodiment, the rotary door 2
Although the seal structure of No. 0 was not described, a film member having a communication hole was arranged on the outer peripheral side of the arcuate door operating surface 20b, and this film member was separated by the wind pressure of the blowing air from the partition walls 24-27 on the case 11 side. If a configuration in which the rotary door 20 is pressed into contact with the distal end portion (the configuration of the rotary door using the film member is well known) is adopted, it is possible to ensure the sealing performance of the rotary door 20 and reduce the operating force.

In the above embodiment, the rotary door 2
Although the case where the door operating surface 20b of No. 0 is formed in an arc shape has been described, the door operating surface 20b may not be formed in a complete arc shape, but may be formed in a shape in which a flat surface is provided partially.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an air conditioning unit of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of the air conditioning unit of FIG. 1 in a foot mode.

FIG. 3 is a sectional view of a main part of FIG. 1;

FIG. 4 is a perspective view of a main part of FIG. 1;

FIG. 5 is an explanatory view of a blowing mode according to an embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a prototype (comparative example) of the inventor.

[Explanation of symbols]

11 ... air-conditioning case, 14 ... heater core (heat exchanger for heating), 15, 33 ... bypass passage, 16, 35 ... bypass door, 18 ... hot water valve, 20 ... rotary door, 20a ...
Rotating shaft, 20b: Door operating surface, 20d: Main communication hole, 20
e: auxiliary communication hole, 21: face blowing opening, 22: defroster blowing opening, 23: foot blowing opening, 30 ...
Guideway.

Claims (7)

[Claims] A heating heat exchanger (1) for heating conditioned air.
4), a foot outlet (23) that is provided downstream of the heating heat exchanger (14) and blows out conditioned air toward the occupant's feet, and downstream of the heating heat exchanger (14). A defroster blowout opening (22) provided on the side and blowing out conditioned air toward the inner surface of the vehicle window glass; and door means (20) for opening and closing the blowout openings (22, 23). The means includes a rotating shaft (20a) and the rotating shaft (2).
0a) and a door operating surface (20
b) a rotary door (20) integrally connected with
The two opening openings (22, 23) are opened and closed by the rotational displacement of the door operating surface (20b). Further, the two opening openings (22, 23) are opened by the rotary door (20). When the blowing mode that opens simultaneously is selected, a part of the hot air flowing from the blowing side of the heating heat exchanger (14) toward the foot blowing opening (23) is branched to form the defroster blowing opening (22). The air conditioner for a vehicle, comprising: a hot air guide section (20e, 30) for guiding the air to the side of the vehicle. 2. A guide passageway (30) for guiding a part of the hot air toward the defroster blowout opening (22) is formed in the foot blowout opening (23), and the rotary door (20) is formed. ) Of the door operating surface (2)
0b), a main communication hole (20d) for simultaneously opening the two outlet openings (22, 23), and an auxiliary communicating with the guide passage (30) when the two outlet openings (22, 23) are simultaneously opened. The communication hole (20e) is provided, and the warm air guide part is constituted by the guide passage (30) and the auxiliary communication hole (20e).
A vehicle air conditioner according to claim 1. 3. The foot mode in which the blowing mode is a mode in which the amount of blowing air from the defroster blowing opening (22) is small and the amount of blowing air from the foot blowing opening (23) is large. The air conditioner for a vehicle according to claim 1 or 2, wherein the hot air guide section (20d, 30) is always in a shut-off state in a blowing mode other than the above. 4. The rotary door (20) according to claim 1, wherein the hot air guide portion (20d, 30) is arranged at a substantially central portion in the axial direction of the rotary door (20). Vehicle air conditioners. 5. The foot outlet opening (23) and the defroster outlet opening (22) are arranged adjacent to the rotation direction on the outer peripheral side of the door operating surface (20b) of the rotary door (20). The foot outlet opening (23) is arranged closer to the outlet side of the heating heat exchanger (14) than the defroster outlet opening (22). A bypass passage (15) through which cool air is bypassed is provided on a side, and the bypass passage (15) is provided by warm air flowing from the outlet side of the heating heat exchanger (14) toward the foot outlet opening (23). The vehicle according to any one of claims 1 to 4, wherein the cool air from (15) is pressed against the inner wall surface of the door operating surface (20b) and travels toward the defroster outlet opening (22). Dual use air conditioner. 6. The heating heat exchanger (14) is disposed substantially horizontally so that the conditioned air passes vertically through the heat exchange part, and the heating heat exchanger (14) is provided above the heating heat exchanger (14). The air conditioner for a vehicle according to any one of claims 1 to 5, wherein a rotary door (20) is arranged. 7. A rotating shaft (20a) and said rotating shaft (20).
a) a door operating surface (20) extending in the direction of rotation about
b) and a rotary door (20) integrally connected thereto.
In a vehicle air conditioner which opens and closes a plurality of outlets (21 to 23) into a vehicle cabin by rotational displacement of the door operating surface (20b), the air outlets are provided with air-conditioned air at least toward a foot of an occupant. A foot outlet opening (23) for blowing out air, and a defroster outlet opening (22) for blowing out conditioned air toward the inner surface of the vehicle window glass, are further provided by the rotary door (20). When an air outlet mode in which the air outlets are simultaneously opened is selected, an auxiliary communication hole (20e) for branching a part of the warm air toward the foot air outlet (23) is provided in the door operating surface (20b). A guide passage (30) for guiding the warm air passing through the auxiliary opening (20e) to the defroster outlet opening (22).
Is provided in the foot outlet opening (23).