JP7075253B2 - Vehicle air conditioner - Google Patents

Description

The present invention relates to a vehicle air conditioner mounted on a vehicle and whose temperature is adjusted by a heat exchanger to be blown into a vehicle interior to adjust the temperature inside the vehicle interior.

Conventionally, in a vehicle air conditioner 1 mounted on a vehicle, for example, as disclosed in Patent Document 1 shown in FIG. 4, the inside of the air conditioner case 2 is vertically divided by a partition plate 3, and the partition plate 3 is used. The first air passage 4a through which the air flowing in from the first air inlet flows and the second air passage 4b through which the air flowing in from the second air inlet flows are divided by, and the first and second air passages are separated. The evaporator 5 is provided so as to straddle 4a and 4b. Further, a heater core 6 is provided on the downstream side of the evaporator 5, and the air flowing through the first air passage 4a is heated by the upper portion thereof, and the air flowing through the second air passage 4b is heated by the lower portion.

Then, the warm air that has passed through the lower part of the heater core 6 is mixed with the cold air that has bypassed the lower part of the heater core 6 on the downstream side thereof in the air mixing unit 7, and then in the rear portion of the vehicle, the front seat foot opening 8 By being supplied to the rear seat opening 9 that opens downward, the temperature control air is blown to the vicinity of the foot on the rear seat side in the vehicle interior.

In recent years, in the vehicle air conditioner 1 as described above, when the temperature-controlled air to the rear seat side is blown, not only the air is blown to the vicinity of the occupant's feet but also the occupant is simultaneously blown to the vicinity of the occupant's face. It is desired to further enhance the comfort of the air conditioner.

When trying to realize such a face mode in which air is blown to the vicinity of the occupant's face in the rear seats, for example, the downstream side from the rear seat opening 9 is divided into a rear seat side face aisle and a rear seat side foot aisle. It is conceivable to branch and provide a rotary door at the branch portion for switching the communication state between the two aisles and the rear seat opening.

Then, in the case of trying to realize the operation in the bi-level mode in which the air is blown to the vicinity of the occupant's face in the rear seat through the rear seat side aisle and at the same time to the vicinity of the feet through the rear seat side foot aisle with the above-mentioned configuration. The rotary door is positioned so as to straddle between the face aisle and the foot aisle, and the opening for the rear seat on the upstream side is communicated with the face aisle on the rear seat side and the foot aisle on the rear seat. It is possible to simultaneously blow air to the vicinity of the occupant's face and feet in the rear seats. At this time, the comfort of the occupant can be further enhanced by setting the temperature of the temperature-controlled air blown to the vicinity of the occupant's face to be lower than the temperature of the temperature-controlled air to be blown to the vicinity of the feet.

Japanese Unexamined Patent Publication No. 2013-14284

However, in the above-described configuration, the hot air that has passed through the heater core 6 and the cold air that has passed through the evaporator 5 and bypassed the heater core 6 are not sufficiently mixed in the vicinity of the rear seat opening 9, and the upper rear seat is not sufficiently mixed. It will flow into the side face passage. Therefore, the temperature difference between the temperature control air blown near the occupant's face in the rear seat and the temperature control air blown near the feet becomes larger than necessary, and it is difficult to set the desired temperature. There's a problem.

Further, in order to solve such a problem, for example, it is conceivable to reduce the opening area of the rear seat opening 9 so that the hot air and the cold air are mixed more effectively. When the opening area of the opening 9 is reduced, the air resistance of the temperature-controlled air flowing from the rear seat opening 9 to the downstream side increases, and the face mode in which the air is blown only to the vicinity of the occupant's face and the occupant's feet There is a problem that the amount of air blown in the foot mode, which blows air only to the vicinity, decreases.

The present invention has been made in consideration of the above-mentioned problems, and adjusts the air-conditioning temperature in the bi-level mode to a desired temperature while maintaining the air-conditioning amount to each air-conditioning port on the rear seat side in each air-conditioning mode. It is an object of the present invention to provide an air conditioner for a vehicle which can be used.

In order to achieve the above object, the present invention is provided in an air conditioning case, a cooler and a heater provided inside the air conditioning case, a hot air passage in which the heater is arranged, and a downstream side of the cooler. In a vehicle air conditioner having a cold air passage that bypasses a heater and a confluence portion that is provided on the downstream side of the hot air passage and the cold air passage and where cold air and hot air are mixed.
The air-conditioning case is equipped with a rear-seat ventilation unit that is installed so as to face the confluence and adjusts the ventilation to the rear-seat side of the vehicle.
The rear seat blower unit has an upstream opening that opens to the rear of the vehicle in the air conditioning case, and an upstream opening.
A branch part that is located on the downstream side of the upstream side opening and has an open upstream side opening and has a space inside.
A rear seat foot aisle that is connected to the branch and opens to blow air to the vicinity of the foot on the rear seat side of the vehicle,
A rear seat face aisle that is connected to the branch and opens and is provided below the rear seat foot aisle to blow air to the vicinity of the face on the rear seat side of the vehicle.
A switching door that is rotatably arranged at the branch and switches the open / closed state of the upstream opening, the rear seat foot aisle , and the rear seat face aisle .
Have,
The switching door is a rotary door provided with a rotating shaft rotatably supported by the air conditioning case and a shielding plate provided on the radial outer side of the rotating shaft and extending along the circumferential direction of the rotating shaft.
In the foot mode where air is blown only through the rear seat foot aisle , the switching door rotates and the shielding plate is blocked by facing the rear seat face aisle, and in the face mode where air is blown only through the rear seat foot aisle , switching is performed. In the bi-level mode in which the door rotates and the shield plate faces the rear seat foot aisle to block it, and at the same time blows air through the rear seat foot aisle and the rear seat face aisle at the same time, the switching door rotates and the shield plate Is arranged so as to straddle the upstream opening and the rear seat face aisle, and is characterized by blocking a part of the upstream opening and a part of the rear seat face aisle .

According to the present invention, the air-conditioning case constituting the vehicle air-conditioning device is provided with a rear-seat blower unit that adjusts the blown air to the rear-seat side so as to face the confluence where cold air and hot air are mixed. The rear seat ventilation unit is provided below the vehicle rear opening, an upstream opening of the air conditioning case on the rear side of the vehicle, a foot passage for the rear seats that blows air to the vicinity of the feet on the rear seat side of the vehicle, and a foot passage for the rear seats. It is equipped with a face passage for the rear seats that blows air to the vicinity of the face on the seat side, and a switching door for switching the open / closed state of these upstream openings, the foot passage for the rear seats, and the face passage for the rear seats.

Then, in the foot mode in which air is blown only to the vicinity of the foot on the rear seat side of the vehicle through the foot opening, the shielding plate of the switching door faces the rear seat face passage to block the opening of the rear seat face passage, and the rear seat face. In the face mode, in which air is blown only to the vicinity of the face on the rear seat side of the vehicle through the passage , the shielding plate of the switching door faces the foot passage for the rear seats, thereby blocking the opening of the foot passage for the rear seats and from the foot opening and the face opening. In the bi-level mode in which air is blown at the same time , the shielding plate of the switching door is arranged so as to straddle the upstream opening and the rear seat face passage , thereby closing a part of the rear seat face passage.

Therefore, in the bi-level mode in which air is simultaneously blown to the vicinity of the face and the vicinity of the feet on the rear seat side, a part of the upstream opening is closed with a switching door to intentionally reduce the opening area, so that cold air and warm air are intentionally reduced at the confluence. It is possible to further promote mixing with and to blow air whose temperature has been adjusted to a desired temperature toward the rear seat side.

In addition, by making it possible to adjust the ventilation temperature in the bi-level mode by arranging the switching door described above, it is possible to secure a large opening area of the upstream opening in the foot mode and the face mode, so that the rear seat side can be used. When the temperature-controlled air is blown near the feet of the occupant or near the face, the air resistance of the air passing through the upstream opening does not increase, and the air is efficiently blown into the vehicle interior with the desired amount of air. be able to.

As a result, the air blown to the rear seat side in the bi-level mode is adjusted to a desired temperature while maintaining the amount of air blown to the rear seat side without increasing the blowing resistance in the face mode or the foot mode. Is possible.

Further, in the bi-level mode, when closing the upstream opening with the switching door, it is preferable to close a part of the upstream opening on the cold air passage side by the switching door.

According to the present invention, the following effects can be obtained.

That is, the rear seat ventilation unit provided in the air conditioning case is provided at the upstream side opening opened on the rear side of the vehicle of the air conditioning case, the foot opening for blowing air to the vicinity of the foot on the rear seat side of the vehicle, and the rear of the vehicle provided below the foot opening. A bi-level mode that has a face opening that blows air to the vicinity of the face on the seat side and a switching door that switches the open / closed state of these upstream openings, foot openings, and face openings, and simultaneously blows air to the vicinity of the face and feet on the rear seat side. In the above, by closing a part of the upstream side opening with a switching door and intentionally reducing the opening area, the mixing of cold air and hot air at the confluence is further promoted, and the ventilation temperature to the rear seat side is desired. Can be adjusted to temperature. In addition, in the foot mode that blows air only to the vicinity of the feet on the rear seat side and the face mode that blows air only to the vicinity of the face on the rear seat side, a large opening area of the upstream opening can be secured, so that hot air and cold air flow. The air blowing resistance does not increase, and the air passing through the upstream opening can be efficiently blown into the vehicle interior with a desired air blowing amount.

As a result, the air blown to the rear seat side in the bi-level mode is suitably adjusted to a desired temperature while maintaining the amount of air blown to the rear seat side without increasing the blowing resistance in the face mode or the foot mode. can do.

It is a schematic whole sectional view of the air conditioner for vehicles which concerns on embodiment of this invention. FIG. 3 is an enlarged cross-sectional view showing the vicinity of the rear seat side blower unit in the vehicle air conditioner of FIG. 1. FIG. 3A is an enlarged cross-sectional view showing a state in which the rotary door of the rear seat side blower unit blocks the rear seat face passage, and FIG. 3B is an enlarged view showing a state in which the rotary door blocks the rear seat foot passage. It is a cross-sectional view, and FIG. 3C is an enlarged cross-sectional view showing a state in which the rotary door blocks the aisle for a rear seat. It is an overall cross-sectional view which shows the air conditioner for a vehicle which concerns on the prior art.

A preferred embodiment of the vehicle air conditioner according to the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 indicates a vehicle air conditioner according to an embodiment of the present invention. In the following description, the left side (direction of arrow A) of the vehicle air conditioner 10 shown in FIG. 1 will be referred to as the front side of the vehicle, and the right side (direction of arrow B) will be described as the rear side of the vehicle.

As shown in FIG. 1, the vehicle air conditioner 10 includes an air conditioner case 12 that constitutes each air passage, and an evaporator (cooler) 14 that is arranged inside the air conditioner case 12 and cools the air. , A heater core (heater) 16 for heating the air, a door mechanism 18 for switching the flow of air flowing in each of the passages, and a rear seat side ventilation unit (rear seat) for adjusting the ventilation to the rear seat side of the vehicle. Blower unit) 20 and included.

Above the air conditioning case 12 (in the direction of arrow C1), there is a face air outlet 22 that blows air near the occupant's face in the passenger compartment, and a defroster air outlet that is adjacent to the face air outlet 22 and blows air near the front window of the vehicle. 24 is open.

On the other hand, on the rear side (direction of arrow B) of the air conditioning case 12, there is a foot air outlet (not shown) that blows air near the feet of the occupant in the front seat of the vehicle, and a rear seat side below the foot air outlet. A blower unit 20 is provided. The foot air outlet is opened in the air conditioning case 12 on the side wall in the width direction orthogonal to the front-rear direction (arrows A and B).

As shown in FIGS. 1 and 2, the rear seat side ventilation unit 20 has a rear seat side intake port 26 that opens downward (in the direction of arrow C2) on the rear end surface of the air conditioning case 12, and the rear seat side air supply unit 20 has a rear seat side intake port 26. The side intake port 26 is connected to a rear seat aisle (upstream side opening) 28 extending toward the downstream side. The rear seat aisle 28 has a bifurcated branch portion 30 on the downstream side thereof and a rear seat foot aisle (foot opening) 32 connected upward (in the direction of arrow C1) on the downstream side of the branch portion 30. And a rear seat aisle (face opening) 34 connected downward (in the direction of arrow C2) to the branch portion 30, and inside the branch portion 30, the rear seat aisle 28, A switching mechanism (switching door) 36 for switching the open / closed state of the rear seat foot aisle 32 and the rear seat face aisle 34 is provided.

The branch portion 30 has, for example, a space formed in a substantially circular cross section, the upstream side thereof is connected to the rear seat aisle 28, and the downstream side thereof is the rear seat foot aisle 32 and the rear seat. The face passages 34 are provided at predetermined intervals in the circumferential direction. Then, as shown in FIG. 2, a first peripheral wall 38 is formed between the rear seat aisle 28 and the rear seat foot aisle 32, and the rear seat foot aisle 32 and the rear seat face aisle 34 are formed. A second peripheral wall 40 is formed between them, and a third peripheral wall 42 is formed between the rear seat aisle 28 and the rear seat face aisle 34. The first to third peripheral walls 38, 40, and 42 are each formed in an arcuate cross section.

Further, the rear seat foot aisle 32 is connected to an air outlet (not shown) opened near the occupant's feet on the rear seat side of the vehicle, and the rear seat face aisle 34 is connected to the occupant's rear seat side on the rear seat side of the vehicle. It is connected to an air outlet (not shown) that opens near the face.

The switching mechanism 36 is composed of, for example, a rotary door 44 rotatably provided at the branch portion 30, and the rotary door 44 includes a rotary shaft 46 supported by a widthwise wall portion of the air conditioning case 12 and the rotary shaft 46. It has a side wall portion 48 having a fan-shaped cross section extending outward in the radial direction, and a shielding wall 50 formed on the outer edge portion of the side wall portion 48. The shielding wall 50 is formed in an arc shape having a radius corresponding to the first to third peripheral walls 38, 40, 42 of the branch portion 30.

The rotary door 44 is arranged so that the rotating shaft 46 is substantially at the center of the branch portion 30, and is rotated by a driving force from a driving source (not shown) so that the shielding wall 50 becomes the first to third peripheral walls 38. It is arranged so as to face the 40, 42, the rear seat aisle 28, the rear seat foot aisle 32, and the rear seat face aisle 34.

On the other hand, as shown in FIG. 1, the evaporator 14 is housed inside the air conditioning case 12 on the front side (direction of arrow A), and on the downstream side of the evaporator 14, that is, on the rear side (direction of arrow B). The heater core 16 is housed in the heater core 16. The evaporator 14 is formed at substantially the same height as the air conditioning case 12 along the height direction (arrows C1 and C2 directions) of the air conditioning case 12, and the heater core 16 faces, for example, the lower half of the evaporator 14. It is formed at about half the height. Further, the lower portions of the evaporator 14 and the heater core 16 are provided so as to be separated from the bottom portion of the air conditioning case 12.

Then, air is introduced into the air conditioning case 12 from a blower through a duct (not shown) connected to a position on the upstream side of the evaporator 14, and the air is cooled by passing through the evaporator 14 and passes through the heater core 16. The air is heated in.

Further, the passages in the air conditioning case 12 are in the cold air passage 52 in which the evaporator 14 is arranged, the hot air passage 54 formed on the downstream side of the cold air passage 52 and in which the heater core 16 is arranged, and the downstream side of the cold air passage 52. It includes a set of first and second bypass passages 56, 58 that bypass the heater core 16.

The first bypass passage 56 is provided so as to detour above the heater core 16 (direction of arrow C1) and communicates with the downstream side of the cold air passage 52, and the second bypass passage 58 is below the heater core 16 (direction of arrow C2). ), And communicates with the downstream side of the cold air passage 52.

Further, on the upstream side of the evaporator 14, a first partition plate 64 for separating the air supplied to the air conditioning case 12 into the upper air passage 60 and the lower air passage 62 along the vertical direction is provided, and the first partition plate 64 is provided. The partition plate 64 is formed so as to face substantially the center of the evaporator 14 in the height direction, and extends along the air flow direction (arrow B direction). Then, the air (outside air) taken in from the outside of the vehicle is supplied to the upper air passage 60, and the air (inside air) taken in from the inside of the vehicle is supplied to the lower air passage 62.

That is, the vehicle air-conditioning device 10 is a two-layer type capable of simultaneously taking in outside air and inside air, separating them in the vertical direction, and supplying them into the air-conditioning case 12.

The cold air passage 52 on the downstream side of the evaporator 14 is provided with a second partition plate 66 that is divided in the vertical direction (arrows C1 and C2 directions), and the second partition plate 66 is in the front-rear direction of the vehicle air conditioner 10. It is formed so as to be in line with the first partition plate 64 along (directions of arrows A and B).

Further, on the downstream side of the heater core 16, a third partition plate 72 for separating the hot air passage 54 into the upper hot air passage 68 and the lower hot air passage 70 is provided. The third partition plate 72 extends from one end of the heater core 16 facing substantially the center in the height direction along the air flow direction (arrow B direction), and then extends from the middle to the rear seat side intake port 26. It is formed so as to incline toward it.

The door mechanism 18 includes a first air mix door 74 provided between the evaporator 14 and the heater core 16 for adjusting the mixing ratio of cold air and hot air, and air to the second bypass passage 58 on the downstream side of the evaporator 14. It includes a second air mix door 76 for switching the distribution state of the air, a face switching door 78 for adjusting the air blowing state from the face air vent 22, and a defroster switching door 80 for switching the air blowing state from the defroster air port 24.

The first and second air mix doors 74 and 76 are meshed with the first and second shafts 82 and 84 rotatably supported by the air conditioning case 12 via the rack gear 86, respectively, and are drive sources (not shown). As the first and second shafts 82 and 84 rotate due to the driving force from the above, the first and second air mix doors 74 and 76 slide and displace in the vertical direction (arrows C1 and C2 directions).

Then, the first and second air mix doors 74 and 76 adjust the distribution ratio between the cold air heater core 16 flowing through the cold air passage 52 and the first and second bypass passages 56 and 58 by sliding in the vertical direction.

The vehicle air conditioner 10 according to the embodiment of the present invention is basically configured as described above, and the operation and the effect thereof will be described next.

In the vehicle air conditioner 10, when the heating operation (foot mode) for blowing temperature-controlled air to the vicinity of the feet of the occupant is performed, as shown in FIG. 3A, the rotary door 44 of the rear seat side ventilation unit 20 is used. It is rotated under the driving action of a driving source (not shown), and the shielding wall 50 faces the rear seat face passage 34 and is closed. That is, the rear seat foot aisle 32 is in a state of communicating with the rear seat aisle 28 via the branch portion 30.

As a result, the outside air and the inside air pass through the inside of the evaporator 14 and flow to the cold air passage 52 through the upper air passage 60 and the lower air passage 62, and the cold air flowing to the cold air passage 52 is generated. In the vertical direction of the second partition plate 66, they are guided to the heater core 16 and the first and second bypass passages 56 and 58 by the first and second air mix doors 74 and 76, respectively, and are rejoined at the merging portion 88 to control the temperature. It becomes a temperature control air.

Then, this temperature control air is blown to a foot air outlet (not shown) by the third partition plate 72 and is blown to the vicinity of the occupant's feet on the front seat side, and is also blown from the rear seat side intake port 26 to the rear seat aisle. By flowing into 28 and flowing through the branch portion 30 to the rear seat foot aisle 32, the air is blown to the vicinity of the foot on the rear seat side.

Next, when performing cooling operation (face mode) in which temperature control air is blown to the vicinity of the occupant's face, the face air outlet 22 is opened by the face switching door 78, and as shown in FIG. 3B, the rear seat is further seated. The rotary door 44 of the side blower unit 20 is rotated so that the shielding wall 50 faces the rear seat foot passage 32 and is closed. That is, the rear seat face aisle 34 is in a state of communicating with the rear seat aisle 28 via the branch portion 30.

As a result, the outside air and the inside air through the upper air passage 60 and the lower air passage 62 are cooled through the evaporator 14 and flow to the cold air passage 52, and the cold air flowing to the cold air passage 52 is the first and the cold air passage 52. The second air mix doors 74 and 76 lead to the heater core 16 and the first and second bypass passages 56 and 58, and the temperature is adjusted by rejoining at the confluence 88 to become a temperature control air, which is passed through the face air outlet 22. Air is blown to the vicinity of the occupant's face in the front seat, and flows from the branch portion 30 to the rear seat face aisle 34 via the rear seat side intake port 26 and the rear seat aisle 28, and is near the occupant's face in the rear seat. Is blown to.

Further, when operating in the bi-level mode in which the temperature control air is simultaneously blown to the vicinity of the occupant's face and feet, the rotary door 44 of the rear seat side blowing unit 20 is rotated as shown in FIGS. 1 and 2. The shielding wall 50 is arranged so as to face the third peripheral wall 42 of the branch portion 30 and to block a part of the rear seat aisle 28 and the rear seat face passage 34, respectively. That is, the rotary door 44 is arranged so as to be downward at the branch portion 30, the rear seat foot aisle 32 is completely opened, and the rotary door 44 straddles the rear seat aisle 28 and the rear seat face aisle 34. Is arranged so that the rear seat aisle 28, the rear seat foot aisle 32, and the rear seat face aisle 34 are in communication with each other.

As a result, a part of the upstream side (in the direction of arrow A) of the heater core 16 is covered by the first and second air mix doors 74 and 76, and the outside air and the inside air pass through the upper air passage 60 and the lower air passage 62. A certain air passes through the evaporator 14 and flows as cold air to the cold air passage 52, and a part of the cold air is downstream from the first and second bypass passages 56 and 58 so as to bypass the heater core 16. The remaining cold air is heated by passing through the heater core 16 and is blown to the downstream side as warm air.

Then, after the cold air flowing through the first bypass passage 56 and the warm air flowing above the third partition plate 72 are mixed on the downstream side of the heater core 16, the face air outlet 22 and the foot air outlet 22 (not shown) are used, respectively. ), It is supplied to the vicinity of the occupant's face and the vicinity of the feet on the front seat side of the vehicle interior, respectively.

On the other hand, the cold air flowing through the second bypass passage 58 flows to the rear side along the bottom of the air conditioning case 12, and the warm air flowing below the third partition plate 72 also flows to the rear side of the air conditioning case 12. .. At this time, when the cold air tries to flow into the rear seat aisle 28 from below, the lower side of the rear seat aisle 28 is blocked by the rotary door 44, so that the cold air is for the rear seat. The warm air that flows upward along the shielding wall 50 of the rotary door 44 exposed in the passage 28 and flows relatively linearly from the upper side to the rear side is mixed by merging at the merging portion 88. Will be done.

Then, after the cold air and the hot air are suitably mixed, they flow into the branch portion 30 from the opened portion of the rear seat aisle 28, and the warm air flows in a relatively linear manner, so that the rear seat foot aisle It is guided to 32, and cold air flows downward along the rotary door 44 to be guided to the rear seat face aisle 34, and is blown to the vicinity of the occupant's face and the vicinity of the feet on the rear seat side, respectively.

On the other hand, when the air blow to the rear seat side by the rear seat side air blower unit 20 is stopped and the air is blown only to the front seat side, the rotary door 44 is rotated as shown in FIG. 3C, and the shielding wall 50 thereof is formed. By arranging so as to face the rear seat aisle 28 and block it, the communication between the rear seat aisle 28 and the rear seat foot aisle 32 and the rear seat face aisle 34 is blocked, and the air blow to the rear seat side is blocked. Will be done.

As described above, in the present embodiment, the rear seat side blower unit 20 capable of blowing air to the rear seat side in the vehicle interior is provided on the rear side of the air conditioner case 12, and the rear seat side blower unit 20 is the air conditioner case 12. A rear seat aisle 28 opened and connected to the rear side of the rear seat, and a rear seat foot aisle 32 and a rear seat face aisle 34 connected to a branch portion 30 branched on the downstream side of the rear seat aisle 28. The open / closed state of the rear seat aisle 28, the rear seat foot aisle 32, and the rear seat face aisle 34 can be switched by the rotary door 44 of the switching mechanism 36.

Therefore, in the bi-level mode in which the temperature control air is simultaneously blown to the vicinity of the occupant's face and the vicinity of the feet on the rear seat side, a part of the rear seat aisle 28 is arranged so as to block the rotary door 44 and the opening area is intentionally opened. By reducing the temperature, the mixing of the cold air and the hot air can be further promoted in the confluence portion 88, and the air blowing temperature to the rear seat side can be adjusted to a desired temperature.

Further, by making it possible to adjust the ventilation temperature in the bi-level mode by arranging the rotary door 44 described above, the opening area of the rear seat side intake port 26 (rear seat aisle 28) in the foot mode and the face mode can be increased. There is no need to squeeze it and it can be secured large. Therefore, in the foot mode in which only warm air is blown to the vicinity of the occupant's feet on the rear seat side and the face mode in which only cold air is blown to the vicinity of the occupant's face on the rear seat side, the blowing resistance of cold air and hot air increases. This cold air and hot air can be efficiently blown to the rear seat side in the vehicle interior with a desired air flow rate.

As a result, the air blown to the rear seat side in the bi-level mode is adjusted to a desired temperature while maintaining the amount of air blown to the rear seat side without increasing the blowing resistance in the face mode or the foot mode. Is possible.

Further, in the above-mentioned bi-level mode, the shielding wall 50 of the rotary door 44 is arranged so as to block a part of the lower portion of the rear seat aisle 28 on the cold air aisle 52 side (direction of arrow C2). As a result, the cold air flowing through the cold air passage 52, which has less flow path resistance than the hot air passage 54, is transferred to the closed rear seat aisle 28 (rear seat side intake port 26) on the cold air passage 52 side. By allowing the cold air to flow in, the flow of the cold air is suitably deflected upward and merged with the warm air. As a result, the flow velocity of the cold air will be lower than when it flows linearly, but since the flow velocity of this cold air is faster than that of the warm air, the flow velocity on the rear seat side will be sufficient after the two are mixed. The air can be blown to the rear seat side in the vehicle interior through the air blowing unit 20.

Further, by using the rotary door 44 as the switching mechanism 36, the rear seat aisle has a simple configuration of a rotating shaft 46 supported by the air conditioning case 12 and a shielding wall 50 provided on the radial outer side of the rotating shaft 46. 28, the rear seat foot aisle 32, and the rear seat face aisle 34 can be selectively and freely opened and closed.

It should be noted that the vehicle air conditioner according to the present invention is not limited to the above-described embodiment, and of course, various configurations can be adopted without departing from the gist of the present invention.

10 ... Vehicle air conditioner 12 ... Air conditioner case 14 ... Evaporator 16 ... Heater core 20 ... Rear seat side air blower unit 26 ... Rear seat side intake port 28 ... Rear seat aisle 30 ... Branch 32 ... Rear seat foot aisle 34 ... Rear seat face aisle 36 ... Switching mechanism 44 ... Rotary door 50 ... Shielding wall 52 ... Cold air passage 54 ... Warm air aisle 56 ... First bypass aisle 58 ... Second bypass aisle 74 ... First air mix door 76 ... Second air Mixed door

Claims (2)

An air-conditioning case, a cooler and a heater provided inside the air-conditioning case, a hot air passage in which the heater is arranged, and a cold air passage provided on the downstream side of the cooler and bypassing the heater. In a vehicle air conditioner having a hot air passage and a confluence portion where cold air and hot air are mixed, which is provided on the downstream side of the cold air passage.
The air-conditioning case is provided with a rear-seat ventilation unit that is provided so as to face the confluence and adjusts ventilation to the rear-seat side of the vehicle.
The rear seat blower unit has an upstream opening opened to the rear side of the vehicle in the air conditioning case and an upstream opening.
A branch portion arranged on the downstream side of the upstream opening, the upstream opening is open, and a space is provided inside.
A rear seat foot aisle that is connected to the branch and opens to blow air to the vicinity of the foot on the rear seat side of the vehicle.
A rear seat face aisle that is connected to the branch portion to open and is provided below the rear seat foot aisle to blow air to the vicinity of the face on the vehicle rear seat side.
A switching door rotatably arranged at the branch portion to switch the open / closed state of the upstream opening, the rear seat foot aisle , and the rear seat face aisle .
Have,
The switching door is a rotary door provided with a rotating shaft rotatably supported by the air conditioning case and a shielding plate provided on the radial outer side of the rotating shaft and extending along the circumferential direction of the rotating shaft. can be,
In the foot mode in which the air is blown only through the rear seat foot passage , the switching door is rotated and the shielding plate is blocked by facing the rear seat face passage, and the air is blown only through the rear seat foot passage . In the face mode, the switching door rotates and the shielding plate is closed by facing the rear seat foot passage, and at the same time, a bi-level mode in which air is simultaneously blown through the rear seat foot passage and the rear seat face passage. The switching door is rotated so that the shielding plate is arranged so as to straddle the upstream opening and the rear seat face passage, and a part of the upstream opening and a part of the rear seat face passage. A vehicle air conditioner characterized by closing the door. In the vehicle air conditioner according to claim 1,
A vehicle air conditioner comprising, in the bi-level mode, when the upstream opening is closed by the switching door, a part of the upstream opening on the cold air passage side is closed by the switching door.

Images