JP2019172027A - Air conditioner for vehicle - Google Patents

Abstract

In a vehicle air conditioner, the size of a vehicle in the front-rear direction is reduced while equalizing the temperature of air blown to the vicinity of a foot of an occupant on a front seat side and a rear seat side. In a vehicle air conditioner provided with a rear-seat blower unit that blows air to a rear seat side, a heat opening is provided inside a air-conditioning case to receive warm air behind a heating unit. 48b are provided. The heat openings 48a and 48b communicate with the front-seat heat vent 32 and the first and second rear-seat heat passages 54 and 86 on the downstream side, and the rear seats are provided below the heat openings 48a and 48b. A rear seat vent opening 58 is provided for taking in cool air to be blown to the side. The heat openings 48a and 48b and the rear seat vent opening 58 are arranged so as to overlap with the heating unit 16 when viewed from the front and rear direction of the vehicle. [Selection diagram] Fig. 1

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, there is known a vehicle air conditioner capable of simultaneously performing air conditioning on a front seat side and a rear seat side in a vehicle interior. Such a vehicle air conditioner is disclosed in, for example, Patent Document 1. As described above, the front seat vent that blows air to the vicinity of the front seat face opens above the downstream side of the air-conditioning case, and the rear seat vent that opens to the vicinity of the rear seat face opens downstream of the heater core. Further, on the downstream side of the air-conditioning case, a heat passage that opens above the heater core and extends downward extends, and a floor vent for the front seat that blows air to the vicinity of the feet on the front seat side is provided at the lower end thereof. It is open.

  Then, the cool air that is cooled by the evaporator and bypasses the upper part of the heater core is blown from the front seat side vent to the vicinity of the face of the front seat occupant, and the cool air that bypasses the lower part of the heater core is sent from the rear seat side vent to the rear seat side. And the warm air that has passed through the heater core is blown from the front seat floor vent to the vicinity of the foot of the passenger in the front seat through a heat passage that extends in the height direction along the downstream side of the air conditioning case. Further, a part of the warm air blown to the front seat floor vent is supplied to the vicinity of the feet of the passengers in the rear seat.

Japanese Patent No. 4296179

  However, in the vehicle air conditioner described above, since the opening of the heat passage for supplying warm air is provided above the heater core, heat is generated to guide the warm air to the front seat floor vent opened downward. It is necessary to provide the passage so as to extend along the height direction, and there is a problem that the air conditioning case is enlarged in the front-rear direction by the amount of the heat passage.

  The present invention has been made in consideration of the above-described problems, and it is possible to reduce the size in the front-rear direction of the vehicle while equalizing the air temperature to the feet of the occupant on the front seat side and the rear seat side. An object of the present invention is to provide a vehicle air conditioner.

To achieve the above object, the present invention provides an air conditioning case having a passage through which air flows, a cooler provided inside the air conditioning case, a heater provided downstream of the cooler, and a heater. A set of cool air passages that bypass the heater up and down on the downstream side of the cooler, cool air that is formed on the downstream side of the heater and flows through the cool air passage, and warm air that has passed through the heater In the vehicle, a merging portion that is temperature-controlled and temperature-controlled, a heat opening for the front seat that blows to the feet of the front seat in the vehicle, a vent opening for the front seat that blows to the vicinity of the face of the front seat, Rear seat heat opening for blowing air to the feet of the rear seat, rear seat vent opening for blowing air to the vicinity of the face of the rear seat, and heat opening formed upstream of the front seat heat opening and the rear seat heat opening And a heat switching door for opening and closing the heat opening. In the device,
The air conditioning case is provided with a rear seat air blowing unit that is provided so as to face the merging portion and blows air from the rear seat heat opening and the rear seat vent opening to the rear seat side,
At least a part of the heat opening and the vent opening for the rear seat is arranged so as to face the heater, respectively.

  According to the present invention, in the vehicle air conditioner having the rear seat air blowing unit capable of blowing air to the rear seat side of the vehicle interior, the rear seat air blowing unit is temperature-controlled by the combination of the cold air and the hot air. A vent for the rear seat that is provided so as to face the junction where the temperature is controlled, and that has a heat opening on the upstream side of the front seat heat opening and the rear seat heat opening, and blows air to the vicinity of the face of the vehicle rear seat At least a part of the opening and the heat opening are arranged so as to face the heater, respectively.

  Therefore, the temperature adjustment air taken in from the heat opening is supplied to the front seat heat opening for blowing air to the vicinity of the feet on the front seat side and the rear seat heat opening for blowing air to the vicinity of the feet on the rear seat side, respectively. Therefore, the temperature-controlled air sent from the front-seat heat opening to the front-seat feet and the temperature-controlled air sent from the rear-seat side heat openings to the rear-seat feet are blown at the same temperature. can do. Further, in the air conditioning case, the vehicle according to the related art that has the heat passage extending in the height direction by arranging the heat opening and the vent opening for the rear seat so as to overlap the heater in the height direction. Compared to an air conditioner for a vehicle, the air conditioning case can be downsized in the longitudinal direction of the vehicle.

  Furthermore, it is good to arrange | position so that at least one part of a heat opening and the vent opening for rear seats may overlap in the height direction of an air-conditioning case.

  Furthermore, the rear seat blower unit may be formed of a separate member from the air conditioning case.

  Still further, the heat opening may be disposed above the vent opening for the rear seat.

  The rear seat vent opening may be arranged so that at least a portion thereof overlaps the cold air passage in the longitudinal direction of the vehicle.

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

  That is, the rear-seat air blowing unit capable of blowing air to the rear seat side of the vehicle interior is provided so as to face the merged portion where the cold air and the hot air are combined with the air-conditioning case and the temperature is adjusted. By providing a heat opening upstream of the heat opening for the seat and the heat opening for the rear seat, the temperature-controlled air taken in from the heat opening is supplied to the heat opening for the front seat and the heat opening for the rear seat, respectively, into the vehicle interior. Therefore, the temperature control air blown from the front seat heat opening to the front seat foot and the temperature control air blown from the rear seat heat opening to the rear seat foot should be the same temperature. Can do. In addition, by arranging at least a part of the vent opening for the rear seat and the heat opening for blowing air to the face of the rear seat so as to face the heater, respectively, the front and rear of the vehicle as compared with the conventional vehicle air conditioner It can be downsized in the direction.

1 is an overall cross-sectional view of a vehicle air conditioner according to an embodiment of the present invention. It is sectional drawing along the II-II line of FIG. It is sectional drawing along the III-III line of FIG.

  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.

  As shown in FIG. 1, the air conditioner 10 for a vehicle includes an air conditioning case 12 that forms each passage of air, an evaporator (cooler) 14 that is disposed inside the air conditioning case 12 and cools the air, It includes a heating unit (heater) 16 that heats the air, a door mechanism 18 that switches the flow of air flowing through each passage, and a rear seat blower unit 20 that blows air to the rear seat side of the vehicle.

  The air conditioning case 12 includes first and second case portions 22 and 24 that can be divided in a width direction (the arrow C direction in FIGS. 2 and 3) perpendicular to the vehicle front-rear direction (arrow A and B direction). Above that (in the direction of arrow D1), a front vent vent opening (front vent opening) 26 for blowing air near the face of the front seat occupant in the passenger compartment, and a front vent opening 26 for the front seat Adjacent to the front window of the vehicle is a defroster blower opening 28 for blowing air. It should be noted that the defroster air vent 28 is formed adjacent to the vehicle front side (arrow A direction) and the front seat vent air vent 26 is located on the vehicle rear side (arrow B direction).

  In addition, a rear seat side opening 30 to which the rear seat blower unit 20 is connected is formed in a wall portion on the rear side (arrow B direction) in the air conditioning case 12, and the first and first orthogonal to the vehicle front-rear direction. 2 In the width direction wall part of the case parts 22 and 24, a front-seat heat blowing port (a front-seat heat opening) 32 that blows air near the feet of the front-seat occupant in the passenger compartment (see FIGS. 1 and 3) Are formed respectively.

  On the other hand, an evaporator 14 is provided inside the air conditioning case 12 at a position on the upstream side (arrow A direction) in the air flow direction, and a predetermined position is set on the downstream side (arrow B direction) with respect to the evaporator 14. A heating unit 16 is provided at an interval.

  The heating unit 16 includes, for example, a heater core 34 that heats air by circulating hot water therein, and an electric heater 36 that is provided downstream (in the direction of arrow B) of the heater core 34 and generates heat under energization. The electric heater 36 heats the passing air to a predetermined temperature and supplies it to the downstream side when the heating element generates heat based on a control signal from the controller.

  Further, a split rib 38 is provided in the air conditioning case 12 between the evaporator 14 and the heater core 34. The split rib 38 is, for example, along the height direction of the heater core 34 (arrow D1, D2 direction). It faces the vicinity of the substantially central portion and is provided between the first air mix door 62 and the second air mix door 64 of the door mechanism 18 described later.

  Further, inside the air conditioning case 12, a cold air passage 40 in which the evaporator 14 is disposed, a hot air passage 42 formed on the downstream side of the cold air passage 40 and in which the heating unit 16 is disposed, and downstream of the cold air passage 40. And a pair of first and second bypass passages (cool air passages) 44 and 46 that bypass the heating unit 16 on the side, and the first bypass passage 44 bypasses the heater core 34 (in the direction of arrow D1). The second bypass passage 46 extends so as to bypass the lower side of the heater core 34 (in the direction of the arrow D2), and communicates with the downstream side of the cold air passage 40, respectively.

  That is, the first and second bypass passages 44 and 46 each function as a cold air passage through which cold air flows.

  Further, at the rear of the heating unit 16 in the air conditioning case 12, the temperature is controlled by adjusting the cool air flowing through the first and second bypass passages 44 and 46 and the warm air flowing through the hot air passage 42 together. A confluence portion 47 that becomes wind is formed.

  A pair of heat openings 48 a and 48 b for guiding the temperature-controlled air to the front seat heat passage (not shown) and the rear seat blower unit 20 are formed behind the junction 47.

  As shown in FIGS. 1 and 2, the heat openings 48a and 48b are provided, for example, in the first and second case portions 22 and 24, respectively, and downstream (in the direction of arrow B) immediately after the electric heater 36. The first opening 50 is formed in a rectangular cross section along the width direction of the air conditioning case 12 (in the direction of arrow C in FIG. 2), and is provided in the lower portion of the first opening 50 in the width direction. And a second opening 52 formed on the surface. That is, the second opening 52 is formed in a narrow shape in the width direction (arrow C direction) with respect to the first opening 50, and the end in the width direction is the width direction of the first opening 50. It is formed so as to be aligned with the end portion.

  In addition, the pair of heat openings 48a and 48b are configured so that the heat opening 48a on the first case portion 22 side and the heat opening 48b on the second case portion 24 side are symmetrical in the width direction (arrow C direction) of the air conditioning case 12. Formed to be.

  The heat openings 48a and 48b are connected to a first rear seat heat passage (rear seat heat opening) 54 in which the first opening 50 extends toward the vehicle rear side on the downstream side shown in FIG. The second opening 52 is connected to the front-seat heat blowing port 32 opened in the wall in the width direction of the air conditioning case 12.

  The first rear seat heat passage 54 is formed in a flat rectangular section that is elongated in the width direction (arrow C direction), and a first rear seat vent passage 60 described later is adjacent to the first rear seat heat passage 54. Formed as follows. The first rear seat heat passage 54 and the first rear seat vent passage 60 are formed so as not to communicate with each other.

  On the other hand, at the position on the downstream side of the electric heater 36 shown in FIG. 2, under the heat openings 48 a and 48 b, the temperature-controlled air temperature-controlled by the junction 47 is blown to the rear seat blower unit 20. A rear-seat vent opening 58 is formed, and the rear-seat vent opening 58 opens downward to a position facing the second bypass passage 46 at the center in the width direction of the air-conditioning case 12 (see FIG. 1). It is formed in a rectangular cross section that is elongated in the direction (see FIG. 2). Further, as shown in FIG. 2, the rear seat vent opening 58 is formed so as to be inside in the width direction of the second opening 52 in the heat openings 48 a and 48 b.

  That is, the vent opening 58 for the rear seat is arranged so as to overlap with the second opening 52 of the heat openings 48a and 48b and the height direction (arrow D1 and D2 direction) of the air conditioning case 12.

  Further, the heat openings 48a, 48b and the rear seat vent opening 58 are disposed at positions overlapping the heater core 34 (heating unit 16) when viewed from the front-rear direction of the vehicle shown in FIG.

  As shown in FIG. 1, the rear seat vent opening 58 is connected to a first rear seat vent passage 60 extending toward the rear side (arrow B direction) of the air conditioning case 12, and this first The rear seat vent passage 60 communicates with the rear seat blower unit 20 through the rear seat opening 30.

  As shown in FIG. 1, the door mechanism 18 includes a first air mix door 62 that is provided between the evaporator 14 and the heater core 34 and adjusts the mixing ratio of cold air and hot air, and on the downstream side of the evaporator 14. A second air mix door 64 that switches the flow state of the cold air to the second bypass passage 46, a first vent switching door 66 that adjusts the air blowing state from the front vent vent vent 26 to the vehicle interior, and the defroster vent 28 A defroster switching door 68 that switches the air blowing state from the front window to the front window, a heat switching door 70 that opens and closes the heat openings 48a and 48b, and a second vent switching door 72 provided in the rear seat air blowing unit 20 described later.

  The first and second air mix doors 62 and 64 are respectively meshed with the first and second shafts 74 and 76 rotatably supported with respect to the air conditioning case 12 via a rack gear 78, and drive means (not shown). When the first and second shafts 74 and 76 are rotated by the driving force from the first and second air mix doors 62 and 64, the first and second air mix doors 62 and 64 are slid in the vertical direction (arrow D1 and D2 directions).

  And the 1st air mix door 62 is provided so that it may become above the division | segmentation rib 38, adjusts the distribution | circulation ratio to the warm air channel | path 42 side of the cold wind which flows through the cool air channel | path 40 by sliding up and down, The two air mix doors 64 are provided below the dividing ribs 38 and slide in the vertical direction to adjust the flow rate between the warm air passage 42 and the second bypass passage 46 below the heater core 34. To do.

  The heat switching door 70 is provided for each of the heat openings 48a and 48b, and includes a rotating shaft 80 supported by the width direction wall portion of the air conditioning case 12, and a shielding wall extending radially outward from the rotating shaft 80. 82. The shielding wall 82 is formed so as to extend on both sides with the rotation shaft 80 as a center. Further, the rotation shaft 80 of the heat switching door 70 is disposed so as to overlap the heater core 34 when viewed from the front-rear direction of the vehicle shown in FIG.

  When the heat switching door 70 is rotated, the heat openings 48a and 48b are opened and closed, and the temperature adjustment airflow to the front seat heat blowing port 32 and the first rear seat heat passage 54 communicated with the heat openings 48a and 48b. The air blowing state is switched. In other words, the single heat switching door 70 can adjust the temperature-controlled air blowing state toward the front seat and the air-conditioning air blowing state toward the rear seat.

  The rear seat blower unit 20 includes a duct 88 having a second rear seat vent passage 84 and a second rear seat heat passage 86 therein, and the rear seat side opening opened in the rear side wall portion of the air conditioning case 12. 30. The duct 88 has a second rear seat heat passage 86 formed in the upper portion and a second rear seat vent passage 84 formed in the lower portion. The duct 88 extends from the air conditioning case 12 side toward the downstream side so as to form two layers. Exist.

  The second rear seat heat passage 86 has an upstream side connected to the first rear seat heat passage 54 of the air conditioning case 12 and a downstream side facing the vicinity of the feet of the rear seat occupant in the passenger compartment (see FIG. (Not shown). The upstream side of the second rear seat vent passage 84 is connected to the first rear seat vent passage 60 (rear seat vent opening 58) of the air conditioning case 12, and the downstream side is connected to the rear seat side occupant in the passenger compartment. It is connected to a blower opening (not shown) facing the vicinity of the face.

  In addition, the second rear seat vent passage 84 is provided with a second vent switching door 72 for switching its communication state. The second vent switching door 72 is opened and closed to open the rear seat face. The air blowing state to the vicinity is switched.

  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.

  First, in the vehicle air conditioner 10, when performing a heating operation (heat mode) in which temperature-controlled air is blown to the vicinity of the feet of the occupant, the heat switching door 70 is rotated around the rotation shaft 80 to be in an open state, The 2-vent switching door 72 is fully closed.

  The ratio of the cool air that has passed through the evaporator 14 flows into the heating unit 16 and the first and second bypass passages 44 and 46 is adjusted by the first and second air mix doors 62 and 64, and flows into the heating unit 16. Then, the warm air heated by passing through the heater core 34 and the electric heater 36 and the cool air flowing into the first and second bypass passages 44 and 46 and bypassing the heating unit 16 merge at the junction 47. The temperature is adjusted.

  The temperature-controlled temperature-controlled air flows rearward from the heat openings 48a and 48b, and is divided into a front seat heat passage and a first rear seat heat passage 54 (not shown), and then the front seat heat. The air is blown from the passage to the vicinity of the feet of the occupant on the front seat side through the front seat heat blowing port 32. In addition, the temperature-controlled air flowing through the first rear seat heat passage 54 flows to the second rear seat heat passage 86 of the rear seat blower unit 20 through the rear seat side opening 30, and from the air outlet (not shown) to the rear. The air is blown to the vicinity of the passenger's feet on the seat side.

  Next, when performing a cooling operation (vent mode) in which temperature-controlled air is blown to the vicinity of the occupant's face, the front vent vent opening 26 is opened by the first vent switching door 66 and the heat switching door 70 is rotated. The second vent switching door 72 is rotated and kept in the open state.

  Thereby, the temperature-controlled air temperature-controlled at the junction 47 is blown to the vicinity of the occupant's face in the front seat through the front-seat vent air outlet 26.

  In addition, the temperature-controlled air flows rearward from the rear seat vent opening 58 along the first rear seat vent passage 60 and then from the rear seat side opening 30 to the second rear seat air blower unit 20. It flows into the vent passage 84 and is blown from a blower opening (not shown) to the vicinity of the face on the rear seat side.

  Next, when performing the bi-level mode in which temperature-controlled air is blown simultaneously to the vicinity of the feet and the face of the occupant, the first and second vent switching doors 66 and 72 and the heat switching door 70 are opened. As a result, the temperature-controlled air temperature-controlled at the merging portion 47 is converted into the heat openings 48a and 48b, the first and second rear seat heat passages 54 and 86, the front seat vent air outlet 26, the first and second rear portions. The air flows to the seat vent passages 60 and 84 and is simultaneously blown to the vicinity of the feet and the face of the passenger.

  As described above, in the present embodiment, in the vehicle air conditioner 10 having the rear seat air blowing unit 20 capable of blowing air to the rear seat side of the vehicle interior, the air conditioning case 12 includes the heating unit 16. Heat openings 48a and 48b and a rear seat vent opening 58 are provided on the downstream side, and the front seat heat blowing port 32 for blowing the heat openings 48a and 48b to the vicinity of the feet on the front seat side, and the rear seat side The heater unit is connected to the first and second rear seat heat passages 54 and 86 for blowing air to the vicinity of the feet, and the heat openings 48a and 48b and the rear seat vent opening 58 are viewed from the front and rear direction of the vehicle. It is arranged at the position that overlaps.

  Thereby, the temperature-controlled air taken in from the heat openings 48a and 48b can be blown to the front seat heat blowing port 32 and the first and second rear seat heat passages 54 and 86, respectively. Therefore, the temperature-controlled air blown to the vicinity of the feet on the front seat side and the temperature-controlled air blown to the vicinity of the feet on the rear seat side can be blown with the same temperature.

  Further, in the air conditioning case 12, the rear seat vent opening 58 and the heat openings 48a and 48b for blowing the temperature-controlled air to the rear seat side are disposed adjacent to each other, and viewed from the front-rear direction of the vehicle (directions of arrows A and B). By arranging the heating unit 16 so as to overlap, the upper part of the air conditioning case 12 is compared with the conventional vehicle air conditioner provided with a heat passage extending in the height direction on the rear side of the air conditioning case. It is possible to reduce the size in the front-rear direction of the vehicle.

  Further, since the second opening 52 and the rear seat vent opening 58 in the heat openings 48a and 48b overlap with each other in the height direction of the air conditioning case 12, the air conditioning case 12 is further reduced in size in the front-rear direction. Can be

  Furthermore, by configuring the rear seat blower unit 20 with a duct 88 that is detachable to the rear side of the air conditioning case 12, for example, in a vehicle that does not blow near the face on the rear seat side, A part of the seat side opening 30 is blocked and the duct 88 is removed, so that it can be easily handled.

  Furthermore, since the temperature of the temperature-controlled air blown to the vicinity of the face is desired to be lower than the temperature of the temperature-controlled air blown to the vicinity of the feet, in the air conditioning case 12, the heat openings 48a and 48b. Is disposed above the vent opening 58 for the rear seat (in the direction of the arrow D1), and the cool air flowing through the cool air passage 40 is preferably guided to the vent opening 58 for the rear seat, thereby the heat opening 48a disposed above. It is possible to blow with a good temperature difference with respect to the temperature-controlled air blown from 48b to the vicinity of the feet on the front seat side and the rear seat side.

  Further, by arranging the vent opening 58 for the rear seat so as to face the downstream side of the second bypass passage 46 through which the cool air flows, the cool air can be actively taken in from the vent opening 58 for the rear seat. Thus, a sufficient temperature difference from the warm air taken in from the heat openings 48a and 48b can be secured.

  Furthermore, the cool air flowing through the second bypass passage 46 flows along the bottom of the air conditioning case 12, so that the flow direction can be guided to the rear seat vent opening 58 without being deflected. Therefore, it is possible to reduce the blowing resistance when the cold air flows from the second bypass passage 46 to the rear seat vent opening 58, and to circulate more smoothly to the downstream side.

  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 ... Heating unit 20 ... Rear-seat air blow unit 30 ... Rear-seat side opening 32 ... Front-seat heat blower port 40 ... Cool air passage 42 ... Hot air passage 47 ... Merge 48a, 48b ... Heat opening 50 ... First opening 52 ... Second opening 54 ... First rear seat heat passage 58 ... Rear seat vent opening 60 ... First rear seat vent passage 70 ... Heat switching door 84 ... second rear seat vent passage 86 ... second rear seat heat passage 88 ... duct

Claims (5)

An air conditioning case having a passage through which air flows, a cooler provided inside the air conditioning case, a heater provided downstream of the cooler, a hot air passage provided with the heater, and the cooler A pair of cool air passages that bypass the heater up and down on the downstream side of the heater, and the cool air that is formed on the downstream side of the heater and flows through the cool air passage and the warm air that has passed through the heater join together. A temperature-adjusted merging section, a front-seat heat opening that blows air to the feet of the front seat in the vehicle, a front-seat vent opening that blows air to the vicinity of the face of the front seat, and a rear seat in the vehicle A rear seat heat opening for blowing to the feet, a rear seat vent opening for blowing near the face of the rear seat, and a heat opening formed upstream of the front seat heat opening and the rear seat heat opening And a heat switching door that opens and closes the heat opening. In an air conditioning system for vehicles that,
The air conditioning case includes a rear seat blower unit that faces the merging portion and blows air from the rear seat heat opening and the rear seat vent opening to the rear seat side,
An air conditioner for vehicles, wherein at least a part of the heat opening and the rear seat vent opening are respectively arranged to face the heater. The vehicle air conditioner according to claim 1,
The vehicle air conditioner is arranged so that at least a part of the heat opening and the rear seat vent opening overlap in the height direction of the air conditioning case. The vehicle air conditioner according to claim 1 or 2,
The vehicular air conditioner is characterized in that the rear seat blower unit is formed of a member different from the air conditioning case. In the vehicle air conditioner according to any one of claims 1 to 3,
The vehicle air conditioner, wherein the heat opening is disposed above the vent opening for the rear seat. In the vehicle air conditioner according to any one of claims 1 to 4,
The vehicular air-conditioning apparatus according to claim 1, wherein the rear-seat vent opening is arranged so that at least a part thereof overlaps the cold air passage in the front-rear direction of the vehicle.

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