JP4078007B2 - Air conditioning unit for automobile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioning unit for an automobile.
[0002]
[Prior art]
FIG. 5 is a cross-sectional view showing an example of a conventional product. An automobile air conditioning unit a shown in this figure is disclosed in Japanese Patent Application Laid-Open No. 9-267620, and a unit case b disposed in a vehicle interior space covered with an instrument panel, and the unit A blower c attached to the case b, and both cooling and heating heat exchangers d and e arranged in the unit case b are provided.
[0003]
The unit case b includes a scroll part b1 in which the blower fan c1 of the blower c is accommodated, and a duct part b2 provided adjacent to the scroll part b1 and guiding at least the air passing through the cooling heat exchanger d. I have. In this duct portion b2, there are opened a foot outlet f, a vent outlet g, and a defroster outlet h through which at least the air that has passed through the cooling heat exchanger d flows out of the unit case b.
[0004]
The foot outlet f is provided with a foot duct F for guiding the air flowing out from the foot outlet f to the feet of the passengers in the vehicle compartment. The vent outlet g is provided with a vent duct V that guides air flowing out from the vent outlet g to the vent outlet P1 of the instrument panel. The defroster outlet h is provided with a defroster duct D for guiding the air flowing out from the defroster outlet h to the defroster outlet P2 of the instrument panel.
[0005]
In an air-conditioning unit such as the air-conditioning unit a described above, the width of both the cooling and heating heat exchangers d and e is generally wider than the width of the blower fan c1. The width of the duct part b2 is wider than the width of the scroll part b1.
[0006]
[Problems to be solved by the invention]
By the way, the space in the front part of the passenger compartment covered with the instrument panel is narrow, and in this space, steering members that support the steering column are arranged along the vehicle width direction. In-vehicle devices such as navigation devices are also housed. For this reason, the storage space of the air conditioning unit a is extremely limited, and the size of the unit case b including the various ducts F, V, and D is preferably as small as possible.
[0007]
Accordingly, an object of the present invention is to provide an air conditioning unit for automobiles that can reduce the size of a unit case including a duct as much as possible.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 includes a unit case disposed in a vehicle interior space covered with an instrument panel, a blower attached to the unit case, and a heat exchanger disposed in the unit case. The unit case has a scroll portion in which the blower fan of the blower is housed, and is provided adjacent to the scroll portion to guide the air that is wider than the scroll portion and has passed through the heat exchanger, and to the outside of the unit case of the air blow And a duct portion that is integrally or separately provided with a duct that guides the air flowing out from the outlet to a predetermined position in the vehicle interior. Air conditioning unit for The heat exchanger is disposed at the bottom of the unit case, and the unit case includes a scroll portion and a duct portion at the top thereof, and the duct portion is disposed such that the duct portion is positioned in front of the scroll portion in the vehicle front-rear direction. The duct portion is provided with a vent outlet through which air flows out in the vent mode, and the vent outlet is provided with a vent duct for guiding the air flowing out from the vent outlet to the vent outlet of the instrument panel. The defroster outlet opens to the upper end surface of the duct part, two vent outlets open across the scroll part on the rear surface of the duct part, and vent ducts that allow air to flow rearward on both sides in the axial direction of the scroll part are routed ing It is characterized by that.
[0011]
Claim 2 The described invention is claimed. 1 In the air conditioning unit for an automobile described above, the duct portion is characterized in that the maximum height from the bottom wall of the unit case is set to be equal to or less than the maximum height from the bottom wall of the scroll portion.
[0012]
【The invention's effect】
In the first aspect of the present invention, the duct portion provided adjacent to the scroll portion of the unit case is wider than the scroll portion, and the duct provided at the outlet of the duct portion is , Su Since it is arrange | positioned by the side of a crawl part, the dead space by the side of a scroll part can be used effectively as a piping space of a duct. Therefore, the expansion of the duct in the unit case width direction can be suppressed, and the size of the unit case including the duct can be reduced as much as possible.
[0013]
Also The unit case is arranged such that the duct portion is positioned in front of the scroll portion in the front-rear direction of the vehicle, and the duct portion has a vent outlet opening through which air flows out in the vent mode. Since a vent duct that guides the air flowing out from the vent outlet to the vent outlet of the instrument panel is provided, it extends in the vehicle longitudinal direction between the duct portion having the vent outlet and the vent outlet of the instrument panel. A relatively long distance can be secured. For this reason, the airflow which flows through a duct part can be smoothly distribute | circulated to a vent blower outlet via a vent duct at the time of vent mode, and ventilation resistance at the time of vent mode can be restrained small.
[0014]
In addition, since the length of the vent duct in the longitudinal direction of the vehicle can be made relatively long, if the vent duct has a center vent duct and a side vent duct, the aperture of the center vent duct can be reduced. The air distribution to the center vent duct and the side vent duct can be performed smoothly, and also in this respect, the airflow resistance in the vent mode can be kept small. Accordingly, it is possible to achieve both a large air volume and low noise during the vent mode, and it is possible to achieve both a large air volume during the vent mode and a reduction in the size of the fan motor of the blower.
[0015]
further The vent outlet is the duct part rear Since it opens to the surface, there is no need to raise the vent duct upward from the vent outlet, and the vertical dimension of the unit case including the vent duct can be kept low. Therefore, even when the vent duct is arranged below the steering member in a small vehicle or the like having a small height dimension in the space covered with the instrument panel, it can be dealt with.
[0016]
Claim 2 In the described invention, the claims 1 In addition to the effects of the described invention, the duct portion is set so that the maximum height from the bottom wall of the unit case is equal to or less than the maximum height from the bottom wall of the scroll portion. Thus, the unit case including the vent duct can be further reduced in size.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing an example of an embodiment in which the inventions according to claims 1 to 4 are implemented together. FIG. 2 is a perspective view showing a unit case of what is shown in FIG. An air conditioning unit 1 shown in FIG. 1 is used for an automobile, and is attached to the unit case 2 and a unit case 2 disposed in a space in front of the cabin S covered with the instrument panel P. A blower 3 is provided.
[0018]
As shown in FIGS. 1 and 2, the unit case 2 includes a front wall 2 a disposed on the engine room E side in the front and rear direction X of the vehicle, and a rear wall disposed on the vehicle compartment S side in the rear of the vehicle front and rear direction X 2b, and a scroll portion 21 in which a sirocco fan 3a employed as a blower fan of the blower 3 is accommodated is provided at the top on the rear wall 2b side.
[0019]
A built-in port 31 for incorporating the sirocco fan 3a into the scroll chamber 11 is opened on the right side wall of the scroll portion 21, and a fan motor 3b of the blower 3 that rotationally drives the sirocco fan 3a is attached. An inflow port 32 through which outside air outside the vehicle or inside air in the passenger compartment S flows into the scroll portion 21 is opened in the left side wall of the scroll portion 21.
[0020]
A scroll chamber 11 is formed inside the scroll portion 21. Inside the unit case 2 is formed a substantially U-shaped air passage 5 that communicates with the scroll chamber 11 and through which air from the sirocco fan 3a flows. The air passage 5 includes a descending passage 12 through which air from the sirocco fan 3 a descends along the rear wall 2 b of the unit case 2.
[0021]
At the bottom 22 of the unit case 2, a cooling heat exchanger 6 that cools the air blowing down the down passage 12 is disposed on the rear wall 2 b side, and heat for heating the air that has passed through the cooling heat exchanger 6. The exchanger 7 is disposed on the front wall 2a side. The cooling heat exchanger 6 is disposed in an inclined state from the upright state toward the heating heat exchanger 7 by an appropriate angle. The heating heat exchanger 7 is arranged substantially horizontally next to the cooling heat exchanger 6. Between the cooling heat exchanger 6 and the heating heat exchanger 7, a bypass passage 13 is provided in which the air that has passed through the cooling heat exchanger 6 flows around the heating heat exchanger 7.
[0022]
Below the cooling heat exchanger 6, a drain reservoir 14 is provided for storing condensed water dehumidified by the cooling heat exchanger 6. A drainage port (not shown) for draining condensed water accumulated in the drain reservoir 14 to the outside of the unit case 2 is opened at a portion of the unit case 2 facing the drain reservoir 14. On the bottom wall 2c of the unit case 2, there is a waterproof step 2d that prevents the condensed water collected in the drain reservoir 14 from moving on the bottom wall 2c when the automobile suddenly stops, etc., and wets the heat exchanger 7 for heating. Is formed.
[0023]
In the air passage 5 upstream of the cooling heat exchanger 6, a filter 8 that removes dust being blown covers the entire air blowing surface of the cooling heat exchanger 6 at a position adjacent to the cooling heat exchanger 6. Are arranged. The first guide wall 2e that guides the air that has passed through the heating heat exchanger 7 obliquely upward toward the bypass passage 13 side, and the first guide wall 2e in the air passage 5 downstream from the cooling heat exchanger 6 A second guide wall 2f is provided from the upper end of the first guide wall 2a to the front wall 2a to guide the air flow obliquely upward toward the front wall 2a.
[0024]
The first guide wall 2e forms a warm air passage 15 through which the air that has passed through the heating heat exchanger 7 flows. At the junction of the air flowing through the hot air passage 15 and the air flowing through the bypass passage 13, a cold air position where the hot air passage 15 is closed and the bypass passage 13 is opened, and the hot air passage 15 is opened and the bypass passage is opened. A rotary air mix door 41 is disposed that moves between the hot air positions that close the air passage 13 and distributes the air that passes through the bypass passage 13 and the air that passes through the heating heat exchanger 7 at an appropriate ratio. Has been. The air passage 5 downstream of the air mix door 41 is an air mix chamber 16 that mixes the air that has passed through the bypass passage 13 and the air that has passed through the heat exchanger 7 for heating.
[0025]
A foot passage 17 surrounded by both the first and second guide walls 2e, 2f and the front wall 2a is formed in the unit case 2, and the second guide wall 2f facing the air mix chamber 16 has an air passage. A communication port 33 that allows the mix chamber 16 and the foot passage 17 to communicate with each other is opened. The communication port 33 includes an open position where the rising passage 18 where the air flow rises along the front wall 2a of the unit case 2 is closed to open the communication port 33, and an opening position where the rising passage 18 is opened to close the communication port 33. A pivoting foot door 42 that moves between the closed position and the closed position is provided. The foot door 42 is operated and controlled so as to be in the fully open state at the open position in the foot mode and in the half open state in the bi-level mode.
[0026]
The air duct 5 downstream of the heating heat exchanger 7 is formed, and at least the duct portion 23 of the unit case 2 that guides the air that has passed through the cooling heat exchanger 6 has openings on the left and right sides of the foot passage 17. Each of the foot outlets 34 is an opening. Each foot outlet 34 is provided with a foot duct (not shown) separately from the unit case 2 for guiding the air flowing out from the foot outlet 34 to the feet of the passengers in the passenger compartment S.
[0027]
The duct portion 23 is provided adjacent to the scroll portion 21 at the top of the unit case 2, and the maximum height from the bottom wall 2 c of the unit case 2 is the same as the maximum height from the bottom wall 2 c of the scroll portion 21. And is arranged in front of the vehicle longitudinal direction X of the scroll portion 21. The ascending passage 18 of the duct portion 23 is separated from the scroll chamber 11 by an arc-shaped arc-shaped partition wall 2g of the unit case 2 that forms the scroll chamber 11, and blows air from the engine room E side along the arc-shaped partition wall 2g. It is formed so as to be gradually directed toward the S side.
[0028]
Since the cooling heat exchanger 6 and the heating heat exchanger 7 arranged on the bottom portion 22 of the unit case 2 are wider than the width of the sirocco fan 3a, the bottom portion 22 and the duct portion 23 of the unit case 2 are The width in the width direction Y is wider than the width in the vehicle width direction Y of the scroll portion 21. A vent outlet 35 is opened at each of the projecting portions 24 and 24 of the duct portion 23 projecting to the left and right sides of the scroll portion 21 at the upper end portion of the rear surface 24a in the vehicle front-rear direction. On the upper surface 23 a of the duct portion 23, a defroster outlet 36 is opened at a portion facing the rising passage 18.
[0029]
At the rear edge of the defroster outlet 36 in the duct portion 23, the defroster outlet 36 is opened in the defroster mode and both vent outlets 35 and 35 are closed, and the defroster outlet 36 is opened in the vent mode and the bi-level mode. A pivotal switching door 43 that closes and opens both vent outlets 35 and 35 is provided. In the defroster outlet 36, a defroster duct D for guiding the air flowing out from the defroster outlet 36 in the defroster mode to the defroster outlet P <b> 2 opening on the upper surface near the windshield G of the instrument panel P is separated from the unit case 2. Is provided. In each vent outlet 35, a vent duct V that guides the air flowing out from the vent outlet 35 in the vent mode and the bi-level mode to the vent outlet P 1 that opens to the front of the instrument panel P is separate from the unit case 2. It is provided on the body.
[0030]
FIG. 3 is a perspective view showing a state in which a vent duct is connected to the one shown in FIG. As shown in FIG. 3, the vent ducts V provided at both vent outlets 35, 35 of the unit case 2 are located on the side of the upper part of the scroll portion 21 of the unit case 2, and the inlet 31 (see FIG. 2) and the inlet 32.
[0031]
And the vent duct V is branched from this center vent duct V1 connected to the vent blower outlet P1 opened in the front center part of the instrument panel P, and extends to the side of the center vent duct V1. And a side vent duct V2. The side vent duct V2 is connected to a vent outlet P1 that opens at the front end of the instrument panel P.
[0032]
FIG. 4 is a perspective view showing another example of the embodiment in which the inventions of claims 1 to 4 are implemented together. As shown in FIG. 4, this air conditioning unit 100 is similar to the air conditioning unit 1, at the top of the unit case 102, a scroll portion 21, and a duct portion 23 disposed in front of the scroll portion 21 in the vehicle front-rear direction X. Are provided adjacent to each other. The duct portion 23 is wider than the scroll portion 21, and the maximum height from the bottom wall 102 c of the unit case 102 is the same as the maximum height from the bottom wall 102 c of the scroll portion 21.
[0033]
The cooling heat exchanger 6 disposed on the bottom 22 in the unit case 102 is located on the rear wall 102b side of the unit case 102, and a front bell region 6a through which air flows from above to below, and a front wall 102a of the unit case 102. The main cooling region 6b that is located on the side and that has passed through the pre-bell region 6a is re-passed upward from below, and is tilted at an appropriate angle from the horizontal state so that the pre-bell region 6a is positioned below the main cooling region 6b. is doing.
[0034]
A heat exchanger 7 for heating is arranged substantially horizontally in the air passage 5 downstream of the main cooling region 6b of the cooling heat exchanger 6, and the cold air passing through the main cooling region 6b is heated by the heat exchanger for heating. A bypass passage that flows around 7 is formed. Between the cooling heat exchanger 6 and the heating heat exchanger 7, the cold air that has passed through the main cooling region 6 b of the cooling heat exchanger 6 is transferred to the heating heat exchanger 7 and the bypass passage at an appropriate ratio. A slide-type air mix door 41 that distributes air is disposed.
[0035]
The air mix door 41 includes a rack that meshes with the pinion 9, and a cold air position that covers the heating heat exchanger 7 and opens the bypass passage for the cold air that has passed through the main cooling region 6 b of the cooling heat exchanger 6. Then, the rack and the pinion 9 are slid between the hot air position where the heating heat exchanger 7 is opened and the bypass passage is closed.
[0036]
In the duct portion 23 of the unit case 102, foot outlets 34 are opened on both the left and right side surfaces, and a defroster outlet 36 is opened on the upper surface 23a. Further, the projecting portions 24, 24 of the duct portion 23 projecting to the left and right sides of the scroll portion 21 include a portion located below the built-in port 31 of the scroll portion 21 on the rear surface 24 a in the vehicle longitudinal direction, and the scroll portion 21. A vent outlet 35 is opened at a portion located below the inlet 32.
[0037]
Each vent outlet 35 is provided with a rotary vent door 44 that opens and closes the vent outlet 35 outside the unit case 102, and the defroster outlet 36 has a rotary defroster door that opens and closes the defroster outlet 36. 45 is provided in the unit case 102.
[0038]
A foot duct separate from the unit case 102 is connected to each foot outlet 34. A defroster duct D (see FIG. 1) separate from the unit case 102 is connected to the defroster outlet 36. A vent duct V (see FIG. 1) separate from the unit case 102 is connected to each vent outlet 35. The vent duct V is arranged beside the lower part of the scroll part 21 of the unit case 102 so as to avoid the incorporation port 31 and the inflow port 32 of the scroll part 21.
[0039]
In the air conditioning unit 1, 100 described above, the duct portion 23 of the unit case 2, 102 provided adjacent to the scroll portion 21 is wider than the scroll portion 21, and is provided at the vent outlet 35 of the duct portion 23. The vent duct V thus arranged is arranged beside the scroll portion 21. For this reason, the dead space on the side of the scroll portion 21 can be effectively used as the piping space of the vent duct V. Therefore, the vent duct V is included while suppressing the expansion of the vent duct V in the unit case 2 width direction. The size of the unit case 2 can be reduced as much as possible.
[0040]
By the way, in the conventional product shown in FIG. 5, the unit case b is arranged such that a duct portion b2 provided adjacent to the scroll portion b1 at the top is positioned behind the scroll portion b1 in the vehicle longitudinal direction X. Yes. For this reason, the distance of the vehicle front-back direction X between the duct part b2 of the unit case b and the vent blower outlet P1 of the instrument panel P is short, and air is blown from the vent blower outlet P1 toward the passenger in the passenger compartment S. In the vent mode to be performed, the direction of the air flowing through the duct portion b2 is suddenly changed toward the vent outlet P1. Therefore, the ventilation resistance in the vent mode is increased.
[0041]
In addition, since the length of the vent duct V in the vehicle front-rear direction X is short, when the vent duct V includes the center vent duct V1 and the side vent duct V2, the center vent duct V1 and the side vent duct are provided. Smooth air distribution to V2 cannot be performed, and as a result, a large throttle must be provided in the center vent duct V1 to force air distribution to the side vent duct V2. Increases ventilation resistance during mode.
[0042]
Therefore, in the conventional product shown in FIG. 5, when the amount of air blown into the passenger compartment S in the vent mode is increased, noise is increased and the fan motor is increased to reduce the weight and size of the air conditioning unit. And go backwards.
[0043]
On the other hand, in the air conditioning units 1 and 100, the unit cases 2 and 102 are such that the duct portion 23 provided adjacent to the scroll portion 21 at the top thereof is positioned in front of the scroll portion 21 in the vehicle longitudinal direction X. Is arranged. For this reason, a relatively long distance in the vehicle longitudinal direction X can be secured between the duct portion 23 having the vent outlet 35 and the vent outlet P1 of the instrument panel P. Therefore, during the vent mode, the air flowing through the duct portion 23 can be smoothly circulated to the vent outlet P1 via the vent duct V, and the ventilation resistance in the vent mode can be suppressed to a small value.
[0044]
In addition, since the length of the vent duct V in the vehicle longitudinal direction X can be made relatively long, when the vent duct V includes the center vent duct V1 and the side vent duct V2, the center vent duct V1. Therefore, the air distribution to the center vent duct V1 and the side vent duct V2 can be smoothly performed, and also in this respect, the ventilation resistance in the vent mode can be suppressed to be small. Therefore, it is possible to achieve both a large air volume and a low noise level in the vent mode, and to achieve both a large air volume in the vent mode and a reduction in the size of the fan motor 3b of the blower 3.
[0045]
Further, in the conventional product shown in FIG. 5, the vent outlet g of the unit case b opens at the upper end of the duct portion b2, so that the vent outlet V and the vent outlet P1 of the instrument panel P are connected to the vent duct V. When connecting with the above, it is necessary to once raise the vent duct V upward from the vent outlet g of the unit case b.
[0046]
On the other hand, in the air conditioning unit 1, 100, the vent outlet 35 of the unit case 2 102 opens to the rear surface 24 a in the vehicle front-rear direction of the protruding portion 24 of the duct portion 23 protruding to the side of the scroll portion 21. Therefore, when the vent outlet 35 and the vent outlet P1 of the instrument panel P are connected by the vent duct V, it is not necessary to raise the vent duct V upward from the vent outlet 35. Therefore, in the air conditioning units 1 and 100, the vertical dimension of the unit case 2 and 102 including the vent duct V can be made smaller than that of the conventional product shown in FIG.
[0047]
In the conventional product shown in FIG. 5, the duct part b2 of the unit case b protrudes upward from the scroll part b1, whereas in the air conditioning unit 1,100, the duct part 23 of the unit case 2, 102 is The maximum height from the bottom wall 2 c of the unit case 2 is the same as the maximum height from the bottom wall 2 c of the scroll portion 21. Also in this point, in the air conditioning units 1 and 100, the vertical dimension of the unit cases 2 and 102 including the vent duct V can be made smaller than that of the conventional product shown in FIG.
[0048]
Incidentally, a steering member M (see FIG. 1) for supporting the steering column is disposed in the vehicle width direction Y in the space in the front part of the passenger compartment S covered with the instrument panel P. The vent duct V is disposed above the steering member M. However, the vent duct V may not be disposed above the steering member M due to the relative position between the steering member M and the vent outlet P1 according to the design on the vehicle side. Alternatively, if the vent duct V is disposed above the steering member, the ventilation resistance of the vent duct V increases, which may cause a decrease in air volume and an increase in noise during the vent mode. In such a case, it is necessary to arrange the vent duct V below the steering member M.
[0049]
However, in the conventional product shown in FIG. 5, as described above, the duct portion b2 of the unit case b protrudes upward from the scroll portion b1, and the vent duct V rises upward from the upper end of the duct portion b2. The vertical dimension of the unit case b including the vent duct V is relatively large, and the vent duct V is disposed below the steering member M in a small car or the like having a small height dimension in the space covered with the instrument panel P. In some cases, it may not be possible.
[0050]
On the other hand, in the air conditioning units 1 and 100, the vertical dimension of the unit case 2 and 102 including the vent duct V can be made smaller than the conventional product shown in FIG. Even when the vent duct V is arranged below the steering member M in a small car or the like having a small height dimension in the space, it can be dealt with.
[0051]
In the air conditioning units 1 and 100 described above, the cooling heat exchanger 6 and the heating heat exchanger 7 are employed as heat exchangers. However, the heat exchanger includes the cooling heat exchanger 6 and the heat exchanger 6. Only one of the heat exchanger 7 for heating may be used.
[0052]
In the air conditioning units 1, 100, the scroll portion 21 is provided in the center portion of the unit cases 2, 102 in the vehicle width direction Y, and the vent duct V is disposed on the left and right sides of the scroll portion 21. However, the scroll portion 21 may be provided at one end of the unit case 2 in the vehicle width direction Y. The vent duct V may be disposed only on either the left or right side of the scroll portion 21.
[0053]
Further, in the air conditioning units 1, 100, a vent duct V is disposed beside the scroll portion 21. However, the duct arranged on the side of the scroll portion 21 is not limited to the vent duct V, and may be at least one kind of duct among the foot duct, the defroster duct D, and the vent duct V, and one kind thereof. When there are a plurality of ducts, only one of the plurality of ducts may be used.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.
FIG. 2 is a perspective view showing a unit case of what is shown in FIG.
FIG. 3 is a perspective view showing a state where a vent duct is connected to the one shown in FIG. 2;
FIG. 4 is a perspective view showing another example of the embodiment of the present invention.
FIG. 5 is a cross-sectional view showing an example of a conventional product.
[Explanation of symbols]
1,100 Air conditioning unit
2,102 unit case
2c, 102c Unit case bottom wall
3 Blower
3a Sirocco fan (fan)
6 Heat exchanger for cooling (heat exchanger)
7 Heat exchanger for heating (heat exchanger)
21 Scroll part
22 Bottom
23 Duct section
23a Top surface of duct part
34 Foot outlet (outlet)
35 Vent outlet (outlet)
36 Defroster outlet (outlet)
D Defroster duct (duct)
P1 vent outlet
P instrument panel
S
V Vent duct (duct)
X Vehicle longitudinal direction

Claims (2)

A unit case (2,102) disposed in the interior space of the vehicle compartment (S) covered with the instrument panel (P), a blower (3) attached to the unit case (2,102), and a unit case A heat exchanger (6, 7) disposed in (2, 102), and a unit case (2, 102) includes a scroll unit (3a) in which a blower fan (3a) of a blower (3) is accommodated. 21) and a unit case (2,102) for guiding the air that is provided adjacent to the scroll portion (21) and is wider than the scroll portion (21) and that has passed through the heat exchanger (6,7). A duct portion (23) in which an outlet (34, 35, 36) to the outside opens, and the outlet (34, 35, 36) is connected to the outlet (34, 35, 36) of the duct portion (23). 36) The air blown out from the passenger compartment (S) The air conditioning unit for a motor vehicle which is provided integrally with or separately from the duct that leads into position (D, V) is the unit case (2, 102),
The heat exchanger (6, 7) is arranged at the bottom (22) of the unit case (2, 102), and the unit case (2, 102) has a scroll part (21) and a duct part (23) at the top. And the duct portion (23) is arranged to be positioned in front of the scroll portion (21) in the vehicle front-rear direction (X), and the duct portion (23) has a vent flow through which air flows out in the vent mode. An outlet (35) is opened, and a vent duct (V) for guiding the air flowing out from the vent outlet (35) to the vent outlet (P1) of the instrument panel (P) is provided to the vent outlet (35). Is provided,
The defroster outlet (36) opens to the upper end surface of the duct portion (23), the two vent outlets (35) open to the rear surface (24a) of the duct portion (23) with the scroll portion (21) interposed therebetween, A vent duct (V1, V2) for flowing air to the rear on both sides in the axial direction of the scroll portion (21) is routed . An air conditioning unit for an automobile according to claim 1 ,
The duct part (23) is set so that the maximum height from the bottom wall (2c, 102c) of the unit case (2, 102) is less than the maximum height from the bottom wall (2c, 102c) of the scroll part (21). An air conditioning unit for automobiles.

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