JP2019167008A - Air conditioner for vehicle - Google Patents

Abstract

To adjust a blast temperature in a bi-level mode to a desired temperature while maintaining a blast volume to a face blast port and a foot blast port at a rear seat side in each blast mode, in an air conditioner for a vehicle.SOLUTION: An air conditioner for a vehicle comprises a rear seat side blast unit 20 for blowing air to a rear seat side at a rear side of a vehicle of an air-conditioning case 12. The rear seat side blast unit 20 has a rear seat passage 28 connected to the air-conditioning case 12, and a rear seat foot passage 32 and a rear seat face passage 34 which are branched at a downstream side of the rear seat passage 28 by a branch part 30. A changeover mechanism 36 for switching opening/closing states of the rear seat passage 28, the rear seat foot passage 32 and the rear seat face passage 34 is arranged at the branch part 30. Then, when blowing air to a rear seat side at a bi-level mode, a lower part of the rear seat passage 28 facing a cold wind passage 52 is blocked by a rotary door 44 of the changeover mechanism 36, and a cold wind and a hot wind from a cold wind passage 52 are thereby effectively mixed, and can be blown to the rear seat side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle air conditioner that is mounted on a vehicle and that adjusts the temperature of the vehicle interior by blowing air that has been temperature-adjusted by a heat exchanger into the vehicle interior.

  Conventionally, a vehicular air conditioner 1 mounted on a vehicle has an interior of an air conditioning case 2 that is vertically divided by a partition plate 3 as disclosed in, for example, Patent Document 1 shown in FIG. Are divided into a first air passage 4a through which air flowing in from the first air inlet flows and a second air passage 4b through which air flowing in from the second air inlet flows, and the first and second air passages 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, the air flowing through the first air passage 4 a is heated by the upper portion thereof, and the air flowing through the second air passage 4 b is heated by the lower portion thereof.

  The hot air that has passed through the lower part of the heater core 6 is mixed in the air mixing unit 7 with the cold air that has bypassed the lower part of the heater core 6 on the downstream side, and then the front seat foot opening 8 in the rear part of the vehicle. The temperature-controlled air is sent to the vicinity of the feet on the rear seat side of the vehicle interior by being supplied to the rear seat opening 9 that opens downward.

  In recent years, in the vehicle air-conditioning apparatus 1 as described above, when the temperature-controlled air to the rear seat side is blown, not only is it blown to the vicinity of the passenger's feet, but is also simultaneously blown to the vicinity of the passenger's face. It is desired to increase the comfort of the car.

  When trying to realize such a face mode that blows air to the vicinity of the occupant's face in the rear seat, for example, the downstream side from the rear seat opening 9 is a rear seat face passage and a rear seat foot passage. It is conceivable to provide a rotary door for branching, and switching the communication state between the two passages and the rear seat opening at the branch portion.

  And, in the configuration as described above, when trying to realize the driving 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 face passage and at the same time the air is blown to the vicinity of the feet through the rear seat side foot passage. The rotary door is positioned so as to straddle between the face passage and the foot passage, and the upstream rear seat opening and the rear seat face passage and the rear foot foot passage are communicated together. Air conditioning can be simultaneously performed near the occupant's face and feet near the rear seat. At this time, the temperature of the temperature-controlled air blown to the vicinity of the occupant's face is set lower than the temperature of the temperature-controlled air blown to the vicinity of the feet, so that the passenger's comfort can be further enhanced.

JP2013-14284A

  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 opening 9 for the rear seat, and the upper rear seat. It will flow into the side face passage. Therefore, the temperature difference between the temperature-controlled air blown to the vicinity of the occupant's face in the rear seat and the temperature-controlled air blown to the foot vicinity becomes larger than necessary, and it is difficult to set the desired temperature. There's a problem.

  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 warm air and cold air are more effectively mixed. If the opening area of the opening 9 is reduced, the blowing resistance of the temperature-controlled air flowing from the rear seat opening 9 to the downstream side increases, so that the face mode or the foot of the occupant that blows only to the vicinity of the occupant's face There arises a problem that the amount of air blown in the foot mode that blows air only in the vicinity decreases.

  The present invention has been made in consideration of the above-described problems, and adjusts the blowing temperature in the bi-level mode to a desired temperature while maintaining the blowing amount to each blowing port on the rear seat side in each blowing mode. An object of the present invention is to provide a vehicle air conditioner that 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 in the air conditioning case, a hot air passage in which the heater is disposed, and a downstream side of the cooler. In a vehicle air conditioner having a cold air passage that bypasses the heater, and a hot air passage and a merging portion that is provided downstream of the cold air passage and in which cold air and hot air are mixed,
The air conditioning case is provided with a rear seat air blow unit that is provided to face the junction and adjusts the air flow to the rear seat side in the vehicle.
The rear seat blower unit has an upstream opening that opens to the vehicle rear side in the air conditioning case, and
A foot opening that opens to the downstream side of the upstream opening and blows air to the vicinity of the foot on the vehicle rear seat side; and
A face opening that is provided below the foot opening and blows air to the vicinity of the face on the vehicle rear seat side;
A switching door that switches between opening and closing states of the upstream opening, foot opening, and face opening;
Have
The switching door closes the face opening in the foot mode that blows air only from the foot opening, and closes the foot opening in the face mode that blows air only from the face opening, and the bi-level mode that blows air simultaneously from the foot opening and face opening The method is characterized in that a part of the upstream opening is closed.

  According to the present invention, the air conditioning case constituting the vehicle air conditioner is provided with a rear seat air blowing unit that adjusts the air flow to the rear seat side so as to face the junction where cold air and hot air are mixed, The rear seat ventilation unit includes an upstream opening that opens to the vehicle rear side of the air conditioning case, a foot opening that blows air to the vicinity of the foot on the vehicle rear seat side, and a face that is provided below the foot opening and near the face on the vehicle rear seat side. A face opening that blows air and a switching door that switches between opening and closing states of the upstream opening, the foot opening, and the face opening are provided.

  In the foot mode that blows air only to the vicinity of the foot on the rear seat side through the foot opening, the face opening is closed by the switching door, and in the face mode that blows air only to the vicinity of the face on the rear seat side through the face opening, In the bi-level mode in which the opening is closed and air is simultaneously blown from the foot opening and the face opening, a part of the upstream opening is closed by the switching door.

  Therefore, in the bi-level mode in which air is blown simultaneously to the vicinity of the face on the back seat side and the vicinity of the feet, a part of the upstream opening is closed with a switching door to intentionally reduce the opening area, so that cold air and hot air are And the air whose temperature is adjusted to a desired temperature can be blown to the rear seat side.

  In addition, since it is possible to adjust the ventilation temperature during the bi-level mode by the arrangement of 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. When temperature-controlled air is blown near the passenger's feet or near the face, the blowing resistance of the air passing through the upstream opening is not increased, and the air is efficiently blown into the vehicle interior with a desired blowing amount. 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 air flow rate to the rear seat side without increasing the air blowing resistance in the face mode or the foot mode. Is possible.

  In the bilevel mode, when the upstream opening is closed by the switching door, a part of the upstream opening on the cold air passage side may be closed by the switching door.

Further, the switching door has a rotation shaft that is rotatably supported by the air conditioning case,
A shielding plate provided on a radially outer side of the rotating shaft and extending along a circumferential direction of the rotating shaft;
A rotary door equipped with

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

  That is, a rear seat air blower unit provided in the air conditioning case includes an upstream opening that opens to the vehicle rear side of the air conditioning case, a foot opening that blows air to the vicinity of the foot on the vehicle rear seat side, and a rear side of the vehicle that is provided below the foot opening. Bi-level mode with a face opening that blows air near the face on the seat side and a switching door that switches the open / closed state of the upstream opening, foot opening, and face opening, and simultaneously blows air to the back seat side and foot area In this case, the opening area is intentionally reduced by blocking a part of the upstream opening with a switching door, thereby further promoting the mixing of the cold air and the hot air at the merging portion and setting the air blowing temperature to the rear seat side as desired. Can be adjusted to temperature. Also, in the foot mode that blows air only to the vicinity of the foot on the rear seat side and the face mode that blows air only to the vicinity of the face on the rear seat side, it is possible to secure a large opening area of the upstream opening, so hot air and cold air circulate The air blowing resistance at the time 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 the desired temperature while maintaining the air flow to the rear seat side without increasing the airflow resistance in the face mode or foot mode. can do.

1 is a schematic overall cross-sectional view of a vehicle air conditioner according to an embodiment of the present invention. It is an expanded sectional view which shows the back seat side ventilation unit vicinity in the vehicle air conditioner of FIG. FIG. 3A is an enlarged cross-sectional view showing a state in which the rotary door of the rear seat-side air blowing unit closes the rear seat face passage, and FIG. 3B is an enlarged view showing a state in which the rotary door closes the rear seat foot passage. FIG. 3C is an enlarged sectional view showing a state where the rotary door closes the rear seat passage. It is whole sectional drawing which shows the vehicle air conditioner which concerns on a prior art.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a 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 (arrow A direction) of the vehicle air conditioner 10 shown in FIG. 1 is described as the front side of the vehicle, and the right side (arrow B direction) is described as the rear side of the vehicle.

  As shown in FIG. 1, the vehicle air conditioner 10 includes an air conditioning case 12 that constitutes each air passage, and an evaporator (cooler) 14 that is disposed inside the air conditioning 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 through the passages, and a rear seat side blower unit (rear seat) for adjusting the air flow to the rear seat side of the vehicle Air blowing unit) 20.

  Above the air conditioning case 12 (in the direction of the arrow C1), a face blower port 22 that blows air in the vicinity of the occupant's face in the vehicle interior, and a defroster blower port that blows air near the face blower port 22 and in the vicinity of the front window of the vehicle. 24 is open.

  On the other hand, on the rear side of the air conditioning case 12 (in the direction of arrow B), there is a foot blower port (not shown) that blows air near the feet of the occupant in the front seat of the vehicle, and the rear seat side at the lower part of the foot blower port. A blower unit 20 is provided. In addition, the foot blower opening is opened in the width direction side wall orthogonal to the front-back direction (arrow A, B direction) in the air-conditioning case 12. FIG.

  As shown in FIGS. 1 and 2, the rear seat-side air blowing unit 20 includes a rear seat-side intake 26 that opens downward (in the direction of arrow C <b> 2) on the rear end surface of the air conditioning case 12. The side intake port 26 is connected to a rear seat passage (upstream side opening) 28 extending toward the downstream side. The rear seat passage 28 is divided into a bifurcated branch portion 30 on the downstream side thereof, and a rear seat foot passage (foot opening) 32 connected further upward (in the direction of arrow C1) on the further downstream side of the branch portion 30. And a rear seat face passage (face opening) 34 connected to the lower portion (in the direction of the arrow C2) with respect to the branch portion 30, and the rear seat passage 28, A switching mechanism (switching door) 36 for switching the open / closed state of the rear seat foot passage 32 and the rear seat face passage 34 is provided.

  The branch part 30 has, for example, a space formed in a substantially circular cross section inside, and an upstream side thereof is connected to the rear seat passage 28, and a rear seat foot passage 32 and the rear seat are provided downstream thereof. The face passage 34 is provided at a predetermined interval in the circumferential direction. As shown in FIG. 2, a first peripheral wall 38 is formed between the rear seat passage 28 and the rear seat foot passage 32, and the rear seat foot passage 32 and the rear seat face passage 34 are connected to each other. A second peripheral wall 40 is formed therebetween, and a third peripheral wall 42 is formed between the rear seat passage 28 and the rear seat face passage 34. The first to third peripheral walls 38, 40, and 42 are each formed in a cross-sectional arc shape.

  The rear-seat foot passage 32 is connected to a blower opening (not shown) that opens near the foot of the occupant on the rear seat side of the vehicle, and the rear-seat face passage 34 is formed on the rear seat side of the vehicle. It is connected to a blower opening (not shown) opened near the face.

  The switching mechanism 36 includes, for example, a rotary door 44 that is rotatably provided at the branch portion 30. The rotary door 44 includes a rotary shaft 46 that is supported by a widthwise wall portion of the air conditioning case 12, and the rotary shaft 46. And 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 a circular 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 rotation 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 is the first to third peripheral walls 38. 40, 42, rear seat passage 28, rear seat foot passage 32, and rear seat face passage 34.

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

  A passage in the air conditioning case 12 includes a cold air passage 52 where the evaporator 14 is disposed, a hot air passage 54 which is formed downstream of the cold air passage 52 and where the heater core 16 is disposed, and downstream of the cold air passage 52. A pair of first and second bypass passages 56 and 58 that bypass the heater core 16 are included.

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

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

  In other words, the vehicle air conditioner 10 is a two-layer type that can take outside air and inside air at the same time, separate them in the vertical direction, and supply them into the air conditioning case 12.

  The cool 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 (arrow C1 and C2 directions). 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 a straight line with the first partition plate 64 along the (arrow A, B direction).

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

  The door mechanism 18 is provided between the evaporator 14 and the heater core 16 and adjusts 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. A second air mix door 76 that switches the flow state of the air, a face switching door 78 that adjusts the air blowing state from the face air blowing port 22, and a defroster switching door 80 that switches the air blowing state from the defroster air blowing 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 with respect to the air conditioning case 12 via the rack gear 86, respectively, and are not shown in the drawing. When the first and second shafts 82 and 84 are rotated by the driving force from the first and second air mix doors 74 and 76, the first and second air mix doors 74 and 76 are slid in the vertical direction (arrow C1 and C2 directions).

  And the 1st and 2nd air mix doors 74 and 76 adjust the distribution | circulation ratio of the heater core 16 of the cold wind which flows through the cold wind passage 52, and the 1st and 2nd bypass passages 56 and 58 by sliding up and down.

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

  In the vehicle air conditioner 10, when performing a heating operation (foot mode) in which temperature-controlled air is blown to the vicinity of the feet of the passenger, as shown in FIG. 3A, the rotary door 44 of the rear seat side blower unit 20 is opened. It is rotated under the driving action of a driving source (not shown), and the shielding wall 50 is in a closed state facing the rear seat face passage 34. That is, the rear seat foot passage 32 is in communication with the rear seat passage 28 via the branch portion 30.

  Thereby, the air that is the outside air and the inside air passes through the inside of the evaporator 14 through the upper air passage 60 and the lower air passage 62, is cooled and flows to the cold air passage 52, and the cold air flowing to the cold air passage 52 is In the up-down direction of the second partition plate 66, the heater core 16 and the first and second bypass passages 56, 58 are led to the heater core 16 and the first and second bypass passages 56, 58 by the first and second air mix doors 74, 76, respectively, and are merged again at the junction 88 to be temperature-controlled. The temperature is controlled.

  The temperature-controlled air is blown to a foot blower (not shown) by the third partition plate 72 and blown to the vicinity of the feet of the passenger on the front seat side, and from the rear seat side intake 26 to the rear seat passage. The air flows into the rear seat foot passage 32 through the branch portion 30 and flows into the vicinity of the foot on the rear seat side.

  Next, when performing a cooling operation (face mode) in which temperature-controlled air is blown to the vicinity of the occupant's face, the face blowing port 22 is opened by the face switching door 78, and as shown in FIG. 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 passage 34 communicates with the rear seat passage 28 via the branch portion 30.

  Thereby, the air which is outside air and inside air through the upper air passage 60 and the lower air passage 62 is cooled through the evaporator 14 and flows into the cold air passage 52, and the cold air flowing into the cold air passage 52 is The air is led to the heater core 16 and the first and second bypass passages 56, 58 by the second air mix doors 74, 76, and the temperature is adjusted by joining again at the junction 88, and the temperature is adjusted. The air is blown to the vicinity of the occupant's face in the front seat and flows from the branching portion 30 to the face passage 34 for the rear seat via the rear seat side intake 26 and the rear seat passage 28, and in the vicinity of the occupant's face in the rear seat It is blown into.

  Further, when driving in the bi-level mode in which the temperature-controlled air is blown simultaneously to the vicinity of the passenger's face and the vicinity of the feet, the rotary door 44 of the rear-seat side blowing unit 20 is rotated as shown in FIGS. The shielding wall 50 faces the third peripheral wall 42 of the branch portion 30 and is disposed so as to block a part of the rear seat passage 28 and the rear seat face passage 34. In other words, the rotary door 44 is arranged at the branch portion 30 so as to be downward, the rear seat foot passage 32 is completely opened, and the rotary door 44 is straddled across the rear seat passage 28 and the rear seat face passage 34. The rear seat passage 28, the rear seat foot passage 32, and the rear seat face passage 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 with the first and second air mix doors 74 and 76, and the outside air and the inside air are passed 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 flows downstream of the heater core 16 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 then sent to the downstream side as hot air.

  And after the cold wind which distribute | circulates the 1st bypass channel 56, and the warm air which flows over the 3rd partition plate 72 are mixed in the downstream of the heater core 16, the face ventilation port 22 and the foot ventilation port (not shown), respectively. ) Is supplied to the vicinity of the passenger's face and the vicinity of the feet on the front seat side in the passenger compartment.

  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 similarly flows to the rear side of the air conditioning case 12. . At this time, when the cold air is about to flow into the rear seat passage 28 from below, the lower side of the rear seat passage 28 is blocked by the rotary door 44. Mixing is performed by flowing along the shielding wall 50 of the rotary door 44 exposed in the passage 28 and then joining the flow of warm air that has flowed relatively straight from the upper side to the rear side at the junction 88. Is done.

  Then, after the cool air and the warm air are suitably mixed, the air flows into the branch portion 30 from the opened portion of the rear seat passage 28, and the warm air flows in a relatively straight line, whereby the rear seat foot passage. When the cool air flows downward along the rotary door 44, the air is guided to the rear seat face passage 34, and is blown to the vicinity of the passenger's face and the vicinity of the feet on the rear seat side.

  On the other hand, when the air blowing to the rear seat side by the rear seat side air blow 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. By arranging so as to face and close the rear seat passage 28, the communication between the rear seat passage 28, the rear seat foot passage 32, and the rear seat face passage 34 is cut off, and air flow to the rear seat side is cut off. Is done.

  As described above, in the present embodiment, the rear seat side blower unit 20 capable of blowing air to the rear seat side of the vehicle interior is provided on the rear side of the air conditioning case 12. A rear-seat passage 28 that is open and connected to the rear side of the rear-seat, and a rear-seat foot passage 32 and a rear-seat face passage 34 that are connected to a branching portion 30 that is branched downstream of the rear-seat passage 28. The opening / closing states of the rear seat passage 28, the rear seat foot passage 32, and the rear seat face passage 34 can be switched by a rotary door 44 of the switching mechanism 36.

  Therefore, in the bi-level mode in which temperature-controlled air is blown simultaneously to the vicinity of the passenger's face and the feet on the rear seat side, a part of the rear seat passage 28 is disposed so as to close the rotary door 44 and is intentionally opened. By reducing the above, the mixing of the cool air and the warm air at the junction 88 can be further promoted, and the temperature of the air sent to the rear seat side can be adjusted to a desired temperature.

  Further, the arrangement of the rotary door 44 described above makes it possible to adjust the air blowing temperature during the bi-level mode, thereby reducing the opening area of the rear seat intake 26 (rear seat passage 28) during the foot mode and the face mode. There is no need to squeeze it and it can be secured large. Therefore, in the foot mode that blows only warm air to the vicinity of the passenger's feet on the rear seat side and the face mode that blows only cold air to the vicinity of the passenger's face on the rear seat side, the blowing resistance of cold air and hot air increases. Therefore, the cold air and the hot air can be efficiently blown to the rear seat side of 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 adjusted to a desired temperature while maintaining the air flow rate to the rear seat side without increasing the air blowing resistance in the face mode or the foot mode. Is possible.

  Further, in the above-described bi-level mode, the shielding wall 50 of the rotary door 44 is disposed so as to block a part of the lower portion of the rear seat passage 28 on the cold air passage 52 side (arrow C2 direction). As a result, the cool air flowing through the cool air passage 52 having less flow resistance compared to the hot air passage 54 is transferred to the rear seat passage 28 (rear seat side intake 26) closed on the cold air passage 52 side. By making it flow in, the flow of the cold air is preferably deflected upward and can be merged with the warm air. As a result, the flow rate of the cold air is reduced compared to the case where it flows in a straight line. However, since the flow rate of the cold air is faster than that of the hot air, the rear seat side has a sufficient flow rate after both are mixed. The air can be blown to the rear seat side of the passenger compartment through the blower unit 20.

  Further, by using the rotary door 44 as the switching mechanism 36, the rear seat passage has a simple configuration of the rotation shaft 46 supported by the air conditioning case 12 and the shielding wall 50 provided radially outside the rotation shaft 46. It is possible to selectively open and close the three passages 28, the rear seat foot passage 32, and the rear seat face passage 34.

  In addition, the vehicle air conditioner according to the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Vehicle air conditioner 12 ... Air conditioning case 14 ... Evaporator 16 ... Heater core 20 ... Rear seat side ventilation unit 26 ... Rear seat side intake 28 ... Rear seat passage 30 ... Branch part 32 ... Rear seat foot passage 34 ... Rear seat face passage 36 ... switching mechanism 44 ... rotary door 50 ... shielding wall 52 ... cool air passage 54 ... warm air passage 56 ... first bypass passage 58 ... second bypass passage 74 ... first air mix door 76 ... second air Mixed door

Claims (3)

An air conditioning case, a cooler and a heater provided in the air conditioning case, a hot air passage in which the heater is disposed, and a cold air passage provided downstream of the cooler and bypassing the heater, In the vehicle air conditioner having the hot air passage and a merging portion provided on the downstream side of the cold air passage and mixed with the cold air and the hot air,
The air conditioning case is provided with a rear seat air blowing unit that is provided so as to face the merging portion and adjusts air flow to the rear seat side in the vehicle,
The rear seat blower unit has an upstream opening that opens to the vehicle rear side in the air conditioning case, and
A foot opening that opens to the downstream side of the upstream opening and blows air to the vicinity of the foot on the vehicle rear seat side;
A face opening that is provided below the foot opening and blows air to the vicinity of the face on the vehicle rear seat side;
A switching door that switches between opening and closing states of the upstream opening, the foot opening, and the face opening;
Have
The switching door closes the face opening in the foot mode in which air is blown only from the foot opening, and closes the foot opening in the face mode in which air is blown only from the face opening, and from the foot opening and the face opening. A vehicular air conditioner that closes a part of the upstream opening in a bi-level mode in which air is blown simultaneously. The vehicle air conditioner according to claim 1,
In the bi-level mode, when the upstream opening is closed by the switching door, the switching door closes a part of the upstream opening on the cold air passage side. The vehicle air conditioner according to claim 1 or 2,
The switching door is a rotary shaft that is rotatably supported by the air conditioning case;
A shielding plate provided on a radially outer side of the rotating shaft and extending along a circumferential direction of the rotating shaft;
A vehicular air conditioner characterized by being a rotary door provided with

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