JP2015044506A - Ventilation duct connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation duct connection structure in which mutual affection of wind flows can be suppressed even in a case where plural ventilation ducts are connected to an air conditioning unit and design change on a ventilation duct can be easily corresponded to.SOLUTION: A ventilation duct connection structure 100 related to the present, which is a structure for connecting plural ventilation ducts forming air channels from the air outlet 104a of an air conditioning unit 104, includes a ventilation duct 110 for front seats, a ventilation duct 120 for rear seats and an adaptor 130 which is connected to the air outlet and connects the air outlet to the ventilation duct for front seats and the ventilation duct for rear seats. The adaptor includes a duct connection part 132 for front seats and a duct connection part 134 for rear seats, and the duct connection part for rear seats has a shape of extending from the duct connection part for rear seats, bending, and, thereafter, extending further downward.

Description

  The present invention includes an air-conditioning unit that is disposed in an instrument panel that partitions an engine room and a vehicle compartment of a vehicle, and that has an air outlet that blows air upward, and that forms a flow path of air from the air outlet. The present invention relates to a vent duct connection structure for connecting vent ducts.

  The engine room and the vehicle compartment of the vehicle are partitioned by a dash panel, and an instrument panel which is a fitting part is arranged on the vehicle compartment side of the dash panel. An air conditioning unit (also referred to as HVAC) is provided on the front side of the instrument panel. The air whose temperature has been adjusted in the air conditioning unit passes through a front duct or the like provided in the instrument panel and is blown out from a ventilator installed in an opening formed in the instrument panel, so that the driver's seat and Supplied to the passenger seat.

  In recent years, a rear vent duct is provided in the center console that extends from the instrument panel to the front side of the vehicle and is located between the driver's seat and the passenger seat, and the temperature is adjusted in the air conditioning unit through the rear vent duct. There are vehicles that supply fresh air to the rear seats. In such a vehicle, a rear ventilator is provided on the rear surface of the center console, and air is blown from here to the rear seat.

  For example, in Patent Document 1, the front end of a center face duct provided on an instrument panel and connected to a center face outlet serving as an outlet for air to a driver seat or a passenger seat is connected to an air conditioning unit. Then, the rear seat duct branches off from the center face duct, and the rear end of the rear seat duct is connected to a rear face outlet provided on the rear surface of the center console, so that air is blown out to the rear seat. The For example, in patent document 2, the upper vent duct is branched from the differential duct.

JP 2009-190471 A Patent No. 3885681

  When the rear duct is branched from the center face duct as in Patent Document 1, the flow of wind in each duct (hereinafter referred to as wind flow) affects each other. For this reason, there existed a subject that it was difficult to perform air volume adjustment in the vent duct to which they were connected. Moreover, in patent document 2, since the upper vent duct has branched from the differential duct, it is necessary to switch an upper vent duct and a differential duct according to blowing mode. For this reason, changing the air volume of the differential duct affects the air volume of the upper vent duct. Furthermore, in the configuration in which another vent duct is branched from one vent duct as in Patent Document 1 and Patent Document 2, when the design of any duct is changed, the vent duct connected to the vent duct and the air conditioning unit is connected. It is also necessary to change the design of the duct connecting portion, and a large design change is forced.

  In view of such a problem, the present invention can suppress the mutual influence of the wind flow even when a plurality of vent ducts are connected to the air conditioning unit, and can easily cope with a design change of the vent duct. It is an object of the present invention to provide a vent duct connection structure that can be used.

  In order to solve the above-mentioned problems, a typical configuration of a vent duct connection structure according to the present invention has an air outlet that is arranged in an instrument panel that partitions an engine room and a vehicle compartment of a vehicle and blows air upward. A vent duct connection structure that includes an air conditioning unit and connects a plurality of vent ducts that form a flow path of air from an air outlet, and supplies the air from the air outlet to a driver seat and a passenger seat. A rear seat vent duct that supplies air from the air outlet to the rear seat, and an adapter that is connected to the air outlet and connects the air outlet to the front seat vent duct and the rear seat vent duct. The rear seat vent has a front seat duct connecting portion for connecting the air outlet to the front seat vent duct, and a rear seat duct connecting portion for connecting the air outlet to the rear seat vent duct. ECTS is characterized in that it has a shape extending further downward after the rear seat duct connecting portions curved to extend rearwardly.

  According to the above configuration, the plurality of vent ducts (the front seat vent duct and the rear seat vent duct) are respectively connected to the air outlet through the adapter. In other words, the outlet is divided by the adapter, and the vent duct is connected to each of the divided outlets, so that the plurality of ducts are in an independent state. Therefore, as in the prior art, when the other duct is branched from one duct, in other words, only one duct is connected to the outlet and the other air duct tends to occur when the other duct is connected to the duct. Mutual influence can be suppressed.

  In particular, by connecting the rear seat duct connecting portion and the rear seat vent duct to the air outlet without passing through other ducts, the air from the air conditioning unit can be guided directly to the rear seat. In addition, since the rear seat vent duct is curved, the wind does not collide with the corner of the duct and lose the flow velocity, that is, the duct ventilation resistance can be reduced. It becomes possible to supply the rear seats with airflow.

  Furthermore, as described above, by connecting a plurality of vent ducts to the outlet through the adapter, even if the design of one vent duct is changed, it is possible to easily cope with the change of the adapter design. This eliminates the need for major design changes for the entire vent duct. Also, when the differential duct and other vent ducts are connected as in the past, it was necessary to provide a switching mechanism in consideration of the effect on the flow rate of other vent ducts when switching the air volume of the differential duct. According to this, all the flow paths from the outlet to the plurality of vent ducts are independent. Therefore, even if the differential duct is connected to the outlet, it is possible to suppress the influence on other vent ducts at the time of switching the air volume, so that the switching mechanism can be made unnecessary.

  The rear seat duct connecting portion may be inclined upward toward the rear of the vehicle. Thereby, the height in the up-down direction of the rear seat duct connecting portion can be reduced while maximizing the opening area of the rear seat duct connecting portion. Therefore, the rear seat duct connecting portion and the rear seat vent duct can be suitably arranged even in a region where a plurality of ducts are densely packed, that is, in a narrow space. Further, when the rear seat duct connecting portion is inclined, the connecting portion of the rear seat vent duct connected thereto is also inclined along the inclination. Thereby, since those connection places become a solid shape, it becomes possible to raise the rigidity of a connection place.

  The front seat vent duct includes a center vent duct whose rear end is connected to a ventilator arranged in the center of the instrument panel in the vehicle width direction, and the front seat duct connecting portion connects the outlet to the center vent duct. The rear seat duct connecting portion is adjacent to the rear side of the center duct connecting portion, and the front end of the rear seat vent duct is preferably located below the center vent duct. According to this configuration, since the center vent duct is located above the rear seat vent duct, the upward lifting of the rear seat vent duct is suppressed. Therefore, it is possible to prevent the rear seat vent duct from coming off due to vibration during traveling.

  The adapter may further include a flange extending from the lower end of the rear seat duct connecting portion toward the inside of the rear seat duct connecting portion. Thereby, if a sealing material (packing) is arrange | positioned on the lower surface of a flange, a packing can be suitably compressed with a flange and an air-conditioning unit, and it will become possible to improve sealing performance. In particular, by extending the flange toward the inside of the rear seat duct connecting portion, it is possible to suitably compress the packing even when there is no space for providing the flange extending outward.

  In addition, as described above, the flange extends toward the inside of the rear seat duct connecting portion, and as described above, the effect of improving the sealing performance is obtained. Erosion of the space around the part can be suppressed. Therefore, the cross-sectional area of the rear-seat vent duct connected to the rear-seat duct connecting portion can be increased by the space. Furthermore, the amount of air flowing through the rear seat vent duct can be adjusted by adjusting the protruding amount of the flange.

  The rear seat vent duct includes an instrument panel or a vehicle body structural member disposed inside the instrument panel that extends downward from the rear seat duct connecting portion and then extends downward. It is preferable that a fixed portion is formed. According to such a configuration, the rear seat vent duct is supported by the vehicle body structural member, that is, a member having high rigidity, by the fixing portion, so that stability can be improved. Also, the rear seat vent duct is connected to the adapter, and the front seat vent duct is also connected to the adapter, so the front seat vent duct is also supported by the vehicle body structural member via the adapter and the rear seat vent duct. Is done. Therefore, the stability of the vent duct for the front seat can be improved.

  According to the present invention, even when a plurality of vent ducts are connected to the air conditioning unit, the mutual influence of the wind flow can be suppressed, and the vent that can easily cope with a design change of the vent duct. A duct connection structure can be provided.

It is a perspective view of a vehicle front part provided with the vent duct connection structure concerning this embodiment. FIG. 2 is an enlarged perspective view of FIG. 1. It is AA sectional drawing of FIG. It is the perspective view which observed the vehicle front part of FIG. 1 from the vehicle front.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a perspective view of a vehicle front portion 100a including a vent duct connection structure 100 according to the present embodiment, and illustrates a state in which the vehicle front portion 100a is observed from the passenger compartment side. FIG. 2 is an enlarged perspective view of FIG. 1 and does not show the instrument panel 102 and the like of FIG. As shown in FIG. 1, in a vehicle front portion 100a including a vent duct connection structure 100 according to the present embodiment, an engine room 102a and a vehicle compartment 102b are partitioned by a dash panel (not shown). On the side, an instrument panel 102 which is a fitting part is arranged. An air conditioning unit 104 shown in FIG. 2 is provided on the vehicle front side of the instrument panel 102 (inside the instrument panel 102). The air conditioning unit 104 adjusts the temperature of air taken in from the outside of the vehicle or the inside of the vehicle (vehicle interior).

  The air whose temperature has been adjusted by the air conditioning unit 104 is blown upward from the air outlet 104a of the air conditioning unit 104 shown in FIG. 2, and through the front seat vent duct 110, a ventilator 108a. 108b, 108c, and 108d (see FIG. 1) are supplied to the driver seat and the passenger seat (both not shown). In the present embodiment, a center console 106 is disposed between the driver's seat and the passenger seat at the center of the instrument panel 102 in the vehicle width direction, and a ventilator 108e is provided on the rear surface of the center console 106. Thus, the air whose temperature is adjusted by the air conditioning unit 104 is supplied from the ventilator 108e to the rear seat (not shown) through the rear seat vent duct 120 (see FIG. 2).

  As described above, in the vent duct connection structure 100 of the present embodiment, the air flow path from the air outlet 104a of the air conditioning unit 104 is formed by a plurality of vent ducts of the front seat vent duct 110 and the rear seat vent duct 120. Is done. The vent duct 110 for the front seat is a flow path for supplying air from the air outlet 104a to the driver seat and the passenger seat, and the rear ends thereof are ventilators 108a, 108b, 108c, and 108d (see FIG. 1). The rear seat vent duct 120 is a flow path for supplying air from the air outlet 104 a to the rear seat, and a rear end thereof is connected to a ventilator 108 e provided on the rear surface of the center console 106. Hereinafter, unless otherwise specified, when referring to both the front seat vent duct 110 and the rear seat vent duct 120, they are referred to as a plurality of vent ducts.

  As shown in FIG. 2, as a feature of the present embodiment, the vent duct connection structure 100 includes a plurality of vent ducts (a front seat vent duct 110 and a rear seat vent duct 120) that form an air flow path, An adapter 130 for connecting them is further provided. Specifically, the lower portion of the adapter 130 is connected to the air outlet 104a of the air conditioning unit 104, and the front seat vent duct 110 and the rear seat vent duct 120 are connected to the air outlet 104a.

  FIG. 3 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 3, the adapter 130 connects the front seat duct connecting portion 132 that connects the air outlet 104 a (see FIG. 2) of the air conditioning unit 104 to the front seat vent duct 110, and the air outlet 104 a of the air conditioning unit 104. And a rear seat duct connecting portion 134 connected to the rear seat vent duct 120. By connecting the front end of the front seat vent duct 110 and the front end of the rear seat vent duct 120 to the front seat duct connecting portion 132 and the rear seat duct connecting portion 134, respectively, the front seat vent duct 110 is connected. The rear seat vent duct 120 is connected to the air outlet 104 a via the adapter 130.

  By connecting a plurality of vent ducts to the outlet 104a via the adapter 130 as in the present embodiment, the wind flow that tends to occur when one vent duct is branched from another vent duct in the past. Mutual influence can be suppressed. In addition, when another vent duct is branched from one vent duct in the related art, the design of one of the vent ducts needs to be changed due to a change in the design of one of the vent ducts. It is possible to cope with the design change of the vent duct only by changing the design. Therefore, a major design change of the entire vent duct is not required.

  Particularly in the present embodiment, as shown in FIGS. 2 and 3, the rear seat vent duct 120 extends rearward from the rear seat duct connecting portion, curves in a circular arc, and further extends downward. Has a shape. Thereby, the wind of a natural flow can be supplied to a rear seat. Further, by connecting the rear-seat vent duct 120 to the air outlet 104a without using other ducts by the rear-seat duct connecting part 134, air from the air-conditioning unit 104 can be directly guided to the rear seat. It is possible to supply air with a sufficient air volume to the rear seat.

  In the present embodiment, the front-seat vent duct 110 and the rear-seat vent duct 120 are illustrated as a plurality of vent ducts. However, the present invention is not limited to this, and other ducts such as a differential duct may be used as the front-seat vent duct 110. Instead of the rear-seat vent duct 120, or in addition to the front-seat vent duct 110 and the rear-seat vent duct 120, the adapter 130 may be connected. In particular, if the differential duct is connected to the adapter 130 of the present embodiment, the influence on the air volume (flow rate) to the vent duct at the time of switching the air volume of the differential duct, which has been apt to occur when the diff duct is branched from the conventional vent duct, is affected. It is suppressed. For this reason, the conventionally required switching mechanism can be eliminated.

  Further, in the present embodiment, as shown in FIG. 3, the upper end 134a of the rear seat duct connecting portion 134 is inclined upward toward the rear of the vehicle. This makes it possible to reduce the height in the vertical direction of the rear seat duct coupling portion 134 while ensuring the maximum opening area of the rear seat duct coupling portion 134 as compared with the case where the upper end is simply horizontal. it can. Therefore, even when a plurality of vent ducts are connected as in the present embodiment and the space is small, the rear seat duct connecting portion 134 and the rear seat vent duct 120 can be suitably arranged. .

  Further, since the upper end 134a of the rear seat duct connecting portion 134 is inclined, the front end of the rear seat vent duct 120 connected thereto is also inclined so as to follow the inclination. Thereby, since the connection part of the duct coupling part 134 for rear seats (adapter 130) and the vent duct 120 for rear seats becomes a three-dimensional shape, it becomes possible to improve the rigidity of the area | region.

  As described above, the instrument panel 102 of the present embodiment is provided with two ventilators 108a and 108b near the center in the vehicle width direction, and on the outside in the vehicle width direction, the ventilator 108c on the right side of the vehicle. A ventilator 108d is provided on the left side of the vehicle (see FIG. 1). For this reason, the front seat vent duct 110 serving as a flow path of air to the ventilators 108a to 108d is constituted by a plurality of vent ducts.

  Specifically, as shown in FIG. 2, the front seat vent duct 110 includes a center vent duct 112, a right vent duct 114, and a left vent duct 116. The center vent duct 112 is disposed in the vicinity of the center in the vehicle width direction, and its rear end is branched into an opening 112a and an opening 112b. By connecting the openings 112a and 112b to the ventilators 108a and 108b (see FIG. 1), air from the air conditioning unit 104 via the center vent duct 112 blows out from the ventilators 108a and 108b to the driver seat and the passenger seat. Is done.

  The light vent duct 114 extends toward the right side from the air outlet 104a, and the opening 114a (see FIG. 4) at the rear end thereof is connected to the ventilator 108c. The left vent duct 116 extends leftward from the air outlet 104a, and the opening 116a at the rear end thereof is connected to the ventilator 108d (see FIG. 1). Thus, the air from the air conditioning unit 104 via the right vent duct 114 and the left vent duct 116 is blown out from the ventilators 108c and 108d to the driver's seat.

  FIG. 4 is a perspective view of the vehicle front portion 100a of FIG. 1 observed from the front of the vehicle. In order to facilitate understanding, in FIG. 4, illustrations other than the front seat vent duct 110, the rear seat vent duct 120, the adapter 130, and members disposed in the vicinity thereof are omitted.

  As described above, the front seat vent duct 110 according to the present embodiment includes the center vent duct 112, the right vent duct 114, and the left vent duct 116. Therefore, as shown in FIG. 4, also in the adapter 130, the front seat duct connecting portion 132 to which the front seat vent duct 110 is connected includes a center duct connecting portion 132 a to which the center vent duct 112 is connected, a light vent duct. It is divided into a right duct connecting part 132b to which 114 is connected and a left duct connecting part 132c to which 116 is connected.

  As a next feature of the present embodiment, as shown in FIG. 3, the rear seat duct connecting portion 134 is a connecting portion between the center vent duct 112 and the adapter 130 in the front seat duct connecting portion 132, that is, the center duct. It is adjacent to the rear side of the connecting portion 132a. As a result, the front end of the rear seat vent duct 120 connected to the rear seat duct connecting portion 134 is located below the center vent duct 112. With this configuration, since the center vent duct 112 is located above the connecting portion between the rear seat vent duct 120 and the rear seat duct connecting portion 134, the upward movement of the rear seat vent duct 120 is restricted, The lift of the rear seat vent duct 120 is suppressed. Therefore, it is possible to prevent the rear seat vent duct 120 from being detached due to vibration during traveling.

  In the present embodiment, as shown in FIG. 3, in the adapter 130, a flange 134 b extending from the lower end toward the inside of the rear seat duct connecting portion 134 is formed in the rear seat duct connecting portion 134. Yes. Thereby, compared with the case where a flange is extended toward the outer side of the duct connection part for rear seats, erosion of the space around the duct connection part 134 for rear seats is suppressed. Therefore, the cross-sectional area of the rear seat vent duct 120 connected to the rear seat duct connecting portion 134 can be expanded by the space, and a sufficient amount of air flowing through the rear seat vent duct 120 is secured. It becomes possible.

  Then, as shown in FIG. 3, a sealing material (hereinafter referred to as packing 140) is arranged on the lower surface of the flange 134b, so that the flange 134b and the peripheral edge 104b of the air outlet 104a of the air conditioning unit 104 (see FIG. 2). Thus, the packing 140 can be suitably compressed, and the sealing performance can be improved. It is also possible to adjust the amount of air flowing through the rear seat vent duct 120 by adjusting the amount of protrusion of the flange 134b.

  Further, in the present embodiment, as shown in FIG. 2, in the rear seat vent duct 120, the fixing portion 122 is formed at the tip that extends downward from the rear seat duct coupling portion 134 and then extends downward. doing. As shown in FIG. 4, the rear seat vent duct 120 is fixed to the steering support member 150, which is a vehicle body structural member disposed inside the instrument panel 102, by the fixing portion 122.

  The vehicle body structural members such as the instrument panel 102 and the steering support member 150 disposed therein are extremely high rigidity members. Therefore, it is possible to improve stability by fixing the rear seat vent duct 120 to these members, that is, by supporting the rear seat vent duct 120. Further, the rear seat vent duct 120 is fixed to the instrument panel 102 and the vehicle body structural member, so that the rear seat vent duct 120 is connected to the adapter 130, and thus the front seat vent is connected to the adapter 130. The duct 110 is also indirectly supported by the instrument panel 102 and the vehicle body structural member. For this reason, it is possible to improve the stability of the adapter 130 and the front-seat vent duct 110, the movement of the adapter 130 and the front-seat vent duct 110 is prevented from moving backward due to vibrations during vehicle travel. Can be prevented.

  In the present embodiment, the rear seat vent duct 120 is illustrated as being fixed to the vehicle body structural member, and the steering support member 150 is illustrated as the vehicle body structural member. However, the present invention is not limited thereto. The rear seat vent duct 120 may be fixed to the instrument panel 102 at the fixing portion 122, or may be fixed to a vehicle body structural member other than the steering support member.

  As described above, in the vent duct connection structure 100 according to the present embodiment, the plurality of vent ducts (the front seat vent duct 110 and the rear seat vent duct 120) are connected to the outlet 104a via the adapter 130, respectively. Is done. In other words, the plurality of vent ducts are branched at the adapter 130, and the air flow paths are independent of each other. Therefore, it is possible to suppress the mutual influence of the wind flow that has occurred when the other duct is branched from one duct as in the prior art. In particular, by connecting the rear seat vent duct 120 to the air outlet 104a without passing through other vent ducts, the air from the air conditioning unit 104 can be guided directly to the rear seat. By curving, it becomes possible to supply a natural flow of wind to the rear seat with a sufficient air volume.

  Further, by connecting a plurality of vent ducts to the air outlet 104a via the adapter 130, even if the design of one vent duct is changed, it is possible to easily cope with the change by simply changing the design of the adapter 130. The entire design change is unnecessary. Further, since only the design change (specification change) of the adapter 130, which is a smaller part than the vent duct, is required, the other duct is connected to one duct, and the design change of the entire vent duct can be made by any design change. Compared to the case where it is necessary, it is possible to suitably carry and store parts according to specifications.

  In the above-described embodiment, it has been explained that the amount of air flowing through the rear seat vent duct 120 can be adjusted by changing the amount of protrusion of the flange 134b formed inside the rear seat duct coupling portion 134. However, for example, by adjusting the position of the partition portion 136 (partition wall) between the front seat duct connecting portion 132 and the rear seat duct connecting portion 134 shown in FIG. In addition, the air volume of the rear seat duct connecting portion 134 can be adjusted. Therefore, by changing only the design of the adapter 130, it is possible to adjust the air distribution balance of the vent ducts without changing the design (shape change) of the front seat duct connecting portion 132 and the rear seat duct connecting portion 134. It can be easily performed.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention includes an air-conditioning unit that is disposed in an instrument panel that partitions an engine room and a vehicle compartment of a vehicle, and that has an air outlet that blows air upward, and that forms a flow path of air from the air outlet. It can utilize for the vent duct connection structure which connects a vent duct.

DESCRIPTION OF SYMBOLS 100 ... Vent duct connection structure, 100a ... Vehicle front part, 102 ... Instrument panel, 102a ... Engine room, 102b ... Car compartment, 104 ... Air-conditioning unit, 104a ... Air outlet, 104b ... Periphery, 106 ... Center console, 108a ... Ventilator 108b ... ventilator 108c ... ventilator 108d ... ventilator 108e ... ventilator 110 ... front seat vent duct 112 112 center vent duct 112a ... opening 112b ... opening 114 ... light vent duct 114a ... Opening 116, Left vent duct 116a Opening 120 Rear seat vent 122 122 Fixing 130 Adapter 132 Front seat duct coupling 132a Center duct coupling 132b Right Duct connection, 32c ... left duct connecting portion, 134 ... rear seat duct connecting portion, 134a ... upper, 134b ... flange, 136 ... partition portion, 140 ... packing, 150 ... steering support member

Claims (5)

An air conditioning unit having an air outlet that is arranged in an instrument panel that divides the engine room and the vehicle compartment of the vehicle and blows air upward, and that connects a plurality of vent ducts that form a flow path of air from the air outlet A vent duct connecting structure,
A vent duct for a front seat for supplying air from the air outlet to a driver seat and a passenger seat;
A rear-seat vent duct for supplying air from the air outlet to the rear seat;
An adapter connected to the outlet and connecting the outlet to the front seat vent duct and the rear seat vent duct;
The adapter has a front seat duct connecting portion that connects the air outlet to the front seat vent duct, and a rear seat duct connecting portion that connects the air outlet to the rear seat vent duct,
The vent duct connection structure according to claim 1, wherein the rear seat vent duct has a shape extending downward from the rear seat duct connecting portion and then extending downward.   The vent duct connection structure according to claim 1, wherein the rear seat duct connection portion is inclined upward toward the rear of the vehicle. The front seat vent duct includes a center vent duct whose rear end is connected to a ventilator disposed in the center of the instrument panel in the vehicle width direction,
The front seat duct connecting portion includes a center duct connecting portion that connects the outlet to the center vent duct,
The rear seat duct connecting portion is adjacent to the rear side of the center duct connecting portion,
The vent duct connection structure according to claim 1 or 2, wherein a front end of the rear seat vent duct is positioned below the center vent duct.   The vent according to any one of claims 1 to 3, wherein the adapter further includes a flange extending from a lower end of the rear seat duct connecting portion toward an inside of the rear seat duct connecting portion. Duct connection structure.   The rear seat vent duct includes an instrument panel or a vehicle body disposed inside the instrument panel at a point extending downward from the rear seat duct connecting portion and then extending downward. The vent duct connection structure according to any one of claims 1 to 4, wherein a fixing portion to the structural member is formed.

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