KR20210113958A - Blower unit of two layer type air conditioner for vehicle - Google Patents

Abstract

Disclosed is a blower unit of an air conditioner for a vehicle, which effectively suppresses a flow of air backflowing around a scroll bell mouth in a blower unit of a two-layer structure. The blower unit of an air conditioner for a vehicle has a scroll case where a first flow passage and a second flow passage are divided to divide and suck internal air and external air, wherein a partition wall dividing a suction unit of the first flow passage and a suction unit of the second flow passage is provided to the scroll case, and an air backflowing prevention unit preventing air introduced to one between the first flow passage or the second flow passage from backflowing to the other flow passage is provided on the partition wall.

Description

Blower unit of air conditioner for vehicle {BLOWER UNIT OF TWO LAYER TYPE AIR CONDITIONER FOR VEHICLE}

The present invention relates to a ventilation unit of an air conditioner for a vehicle, and more particularly, to an air conditioner having a two-layer structure that can maintain high heating performance while securing defogging performance during heating. It relates to a blower unit of an air conditioner for a vehicle having a two-layer flow structure that selectively sucks.

In general, an air conditioner for a vehicle is a device that heats or cools a room by introducing external air into a room or circulating air in the room to heat or cool it. A heater core or the like is configured, and the air cooled or heated by the evaporator or the heater core is selectively blown to each part of the vehicle interior.

In particular, in order to maintain a high heating performance while securing defogging performance during heating, an air conditioner having a two-layer structure has been developed. Low-humidity, cold outside air is effective to remove frost on the window during heating in winter, but it results in lowering the indoor temperature.

The air conditioning system with a two-layer structure realizes a two-layer air flow that supplies outdoor air to the upper part of the vehicle and circulates bet air to the lower part for defogging during heating. While effectively removing it, it provides fresh outside air to the occupants and supplies warm air to the bottom to maintain high heating performance.

Japanese Patent Publication No. 3900965 (2007.01.12), which was previously applied for, discloses a blower unit of an air conditioner for a two-story vehicle. 1 is a cross-sectional view showing a blower unit of a conventional air conditioner for a two-story vehicle.

As shown in FIG. 1, the ventilation unit of the air conditioner for a two-story vehicle includes a case 1, and the case 1 has an inside air inlet 11 for introducing bet air and an outside air inlet 12 for introducing outside air. is formed The case (1) is provided with a bet door 43 for controlling the opening degree of the inside air inlet 11 and the outside air door 44 for controlling the opening degree of the outside air inlet (12). An air filter 5 is provided on the downstream side of the inner and outer air doors 43 and 44 in the air flow direction.

On the downstream side of the air filter (5), dual fans (2,3) rotated by a motor are provided, and on the downstream side of the dual fans (2,3), the first blowing path ( 15) and the second ventilation passage 16 are partitioned. The inside door 43 and the outside door 44 are rotated about the rotation shaft 41, and the partition plate 42 is integrally formed.

The partition plate 42 is composed of a first plate portion 42a extending from the rotation shaft 41 to the arc surface side of the case 1 and a second plate portion 42b extending from the rotation shaft 41 to the air filter 5 side. . In the two laminar flow mode, as the tip of the first plate part 42a is positioned between the inside and outside air inlets 11 and 12, the flow path and the outside air inlet ( In 12), a flow path connecting the second ventilation passage 16 is divided.

The conventional two-layer flow structure blowing unit is provided with a partition wall separating the movement path of the bet and the movement path of the outside air around the scroll-shaped case (1). There was a problem that the fan pass frequency noise (BPT) was generated.

Patent Document 1: Japanese Patent Publication No. 3900965 (2007.01.12)

In order to solve the problems of the related art, the present invention provides a blower unit of an air conditioner for a vehicle capable of effectively suppressing the flow of air backflowing around a scroll bell mouse in a blowing unit having a two-layer flow structure.

In the ventilation unit of the vehicle air conditioner according to the present invention, the ventilation unit of the vehicle air conditioner includes a scroll case in which a first flow passage and a second flow passage are partitioned so that betting and outside air can be separately sucked. A partition wall separating the suction part of the flow path and the suction part of the second flow path is provided, and an air backflow preventing part for suppressing backflow of air flowing into one of the first flow path or the second flow path into the other is provided on the partition wall.

In the above, the first flow path is disposed above the second flow path, the suction part of the second flow path is formed in a lateral direction of the suction part of the first flow path, and the air backflow prevention part is formed around the suction part of the first flow path. .

In the above, the outside air flows through the first flow path and the bet air flows through the second flow path, and the air backflow preventing unit blocks the reverse flow of the outside air flowing into the suction part of the first flow path into the second flow path.

In the above, the air backflow preventing unit includes a curved rib extending from the partition wall along the suction unit scroll deployment direction of the first flow path.

In the above, a plurality of curved ribs are disposed to be separated from each other in the scroll unfolding direction.

In the above, the curved rib is formed of a first curved rib and a second curved rib that extend symmetrically on both sides with respect to the partition wall and are spaced apart from each other.

In the above, the scroll case is composed of an upper scroll case and a lower scroll case, and the air backflow preventing part is formed to protrude upward from the upper surface of the upper scroll case.

* In the above, the protrusion height of the air backflow prevention part is formed equal to or smaller than the protrusion height of the partition wall.

In the above, the scroll case has an upper suction port for introducing air into the first flow path and a lower suction port for introducing air into the second flow path, and the air backflow prevention part is formed to extend along the circumference of the bell mouth of the upper suction port.

In the above, the air introduced into the suction part of the second flow path bypasses through the lateral flow path of the first flow path, and then is sucked from the lower part to the upper part through the lower suction port.

In the above, the first curved rib and the second curved rib are formed to be less than half the suction part of the first flow path in the circumferential direction.

In the above, the suction part of the first flow path is formed under the outdoor air inlet, the suction part of the second flow path is formed below the indoor air inlet, and the air backflow prevention part is the outdoor air inlet where the suction part of the first flow path is located based on the partition wall. is formed at the bottom of

In the above, the plurality of curved ribs are formed to have different lengths from each other.

In the above, the curved rib on the downstream side in the air flow direction of the first flow path is formed to extend longer in the circumferential direction than the curved rib on the upstream side.

The blower unit of the vehicle air conditioner according to the present invention effectively suppresses the flow of backflowing air around the scroll bell mouse, thereby effectively reducing the fan passing frequency noise (BPT) due to the imbalance in the suction flow between the movement path of the bet and the movement path of the outside air. can be prevented, and the air backflow prevention unit can be easily implemented, so that the manufacturing cost is not increased.

In addition, by forming the length of the first curved rib to be longer on the downstream side than the start portion of the air flow along the circumferential direction of the scroll case, it is possible to more effectively prevent the reverse flow of air.

1 is a cross-sectional view showing a blower unit of a conventional air conditioner for a two-story vehicle;
2 is a front view showing an air conditioner for a vehicle according to an embodiment of the present invention;
3 is a perspective view illustrating a scroll case according to an embodiment of the present invention;
Figure 4 is an exploded perspective view of Figure 3,
5 is a cross-sectional view showing a blowing unit according to an embodiment of the present invention,
6 is a plan view illustrating a scroll case according to an embodiment of the present invention;
7 is an enlarged perspective view of a part of a scroll case according to an embodiment of the present invention;
Figure 8 is a cross-sectional view of Figure 7,
9 is a view showing the outdoor air mode of the blowing unit according to an embodiment of the present invention,
10 is a view showing a betting mode of the blowing unit according to an embodiment of the present invention,
11 is a view showing a two-layer flow mode of the blowing unit according to an embodiment of the present invention,
12 is a view showing the noise evaluation results of the blowing unit according to the prior art,
13 is a view showing a noise evaluation result of a blowing unit according to an embodiment of the present invention,
14 is a perspective view illustrating a scroll case according to another embodiment of the present invention;
FIG. 15 is a plan view of FIG. 14 .

Hereinafter, the technical configuration of the ventilation unit of the vehicle air conditioner will be described in detail according to the accompanying drawings.

2 is a front view illustrating an air conditioner for a vehicle according to an embodiment of the present invention, FIG. 3 is a perspective view illustrating a scroll case according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of FIG. 5 is a cross-sectional view illustrating a blowing unit according to an embodiment of the present invention, FIG. 6 is a plan view illustrating a scroll case according to an embodiment of the present invention, and FIG. 7 is a scroll case according to an embodiment of the present invention. is an enlarged perspective view of a part, and FIG. 8 is a cross-sectional view of FIG. 7 .

2 to 8 , an air conditioner for a vehicle according to an embodiment of the present invention includes a blower unit 200 that blows inside or outside air by introducing a bet or outside air, and the air blown from the blower unit 200 is air-conditioned to the interior of the vehicle. It consists of an air conditioning unit 100 for discharging to. The air conditioner for a vehicle is configured to separate internal air from outside air to blow air, and has a two-layer structure that can maintain high heating performance while securing defogging performance during heating.

The blowing unit 200 is formed by combining the scroll case 270 and the intake case 282 .

The intake case 282 is provided on the scroll case 270 . The intake case 282 has a bet inlet 272 for introducing a bet and an outdoor air inlet 271 for introducing outside air are formed. The inside air inlet 272 and the outside air inlet 271 are formed on the upper side of the intake case 282 . The inside door 274 controls the opening degree of the inside air inlet 272, and the outside air door 273 controls the opening degree of the outside air inlet 271. The intake case 282 is provided with an air filter 275 for filtering air passing therethrough.

The scroll case 270 is configured to divide the bet and external air to be sucked. A first flow passage 241 and a second flow passage 242 are partitioned in the scroll case 270 . The first flow path 241 is disposed above the second flow path 242 , and the outside air flows through the first flow path 241 and the bet air flows through the second flow path 242 . A first blower wheel 277 is provided in the first flow path 241 , and a second blower wheel 278 is provided in the second flow path 242 . The first blower wheel 277 and the second blower wheel 278 are rotated by the blower motor 276 .

The scroll case 270 includes an upper scroll case 270a and a lower scroll case 270b. The upper scroll case 270a is coupled to the upper portion of the lower scroll case 270b. A first flow path 241 is formed in the upper scroll case 270a, and a second flow path 242 is formed in the lower scroll case 270b. The first flow passage 241 and the second flow passage 242 are vertically partitioned by the partition wall 250 .

By rotation, the first blower wheel 277 and the second blower wheel 278 introduce air in the axial direction of the blower motor 276 and blow air in the radial direction. The outdoor air introduced into the outdoor air inlet 271 is introduced into the first flow path 241 by the first blower wheel 277, and then discharged into the room through the upper flow path of the air conditioning unit 100, and into the indoor air inlet 272. The introduced bet is introduced into the second flow path 242 by the second blower wheel 278 , and then is discharged into the room through the lower flow path of the air conditioning unit 100 .

The scroll case 270 includes an upper suction port for introducing air into the first flow path 241 and a lower suction port 244 for introducing air into the second flow path 242 . In addition, the scroll case 270 includes the suction part 243 of the first flow path 241 and the suction part 266 of the second flow path 242 . In addition, the air introduced into the suction part 266 of the second flow path 242 bypasses through the lateral flow path of the first flow path 241 and is then sucked from the lower part to the upper part through the lower suction port 244 .

That is, the upper suction port of the first flow path 241 is formed of a circular hole formed along the bell mouth 247 , and is the same as the suction part 243 of the first flow path 241 . On the other hand, the lower suction port 244 of the second flow passage 242 is formed on the lower surface of the lower scroll case 270b, and the suction part 266 of the second flow passage 242 is formed on the upper surface of the upper scroll case 270a. will be formed

The outdoor air introduced through the outdoor air inlet 271 is sucked through the suction part 243 of the first flow path 241, that is, the upper suction port, and flows into the first flow path 241, and the outside air introduced through the inner air inlet 272 The bet moves to the lower part through the suction part 266 of the second flow path 242 and then turns "U" to be sucked into the upper part through the lower suction port 244 and flows to the second flow path 242 .

The scroll case 270 is provided with a partition wall 265 . The partition wall 265 divides the suction part 243 of the first flow path 241 from the suction part 266 of the second flow path 242 . The partition wall 265 protrudes and extends upwardly from the upper surface of the upper scroll case 270a. The suction part 243 of the first flow path 241 is formed under the outdoor air inlet 271 , and the suction part 266 of the second flow path 242 is formed below the indoor air inlet 272 . The suction part 266 of the second flow path 242 is formed in a lateral direction of the suction part 243 of the first flow path 241 .

An air filter 275 is positioned at the upper end of the partition wall 265 , and a wall member capable of partitioning indoor and outdoor air may be formed in the air filter 275 . A partition member 281 extending upwardly is formed on the upper surface of the air filter 275 . The partition member 281 may be integrally formed with the intake case 282 . The outside air and the bet air are separated and guided by the partition member 281 and the partition wall 265 into the suction part 243 of the first flow path 241 and the suction part 266 of the second flow path 242, respectively.

The blowing unit 200 includes an air backflow prevention unit. The air backflow prevention part is provided on the partition wall 265 and functions to prevent the air flowing into one of the first flow path 241 and the second flow path 242 from flowing backward into the other. Specifically, the air backflow preventing unit functions to prevent the air flowing into the first flow passage 241 from flowing back into the second flow passage 242 .

Through the configuration of the air backflow prevention unit as described above, it is possible to solve the fan passing frequency noise (BPT) problem caused by the imbalance of the suction flow between the movement path of the bet and the movement path of the outside air.

More specifically, the air backflow prevention unit includes a curved rib. The curved rib extends from the partition wall 265 in a streamlined shape along the scroll development direction of the suction part 243 of the first flow path 241 . A plurality of curved ribs are arranged to be separated from each other in the scroll unfolding direction. In this embodiment, two curved ribs are provided, and are composed of a first curved rib 310 and a second curved rib 320 .

The first curved rib 310 and the second curved rib 320 are spaced apart from each other by a predetermined distance, and extend symmetrically to each other on both sides based on the partition wall 265 . The first curved rib 310 and the second curved rib 320 are formed around the suction part 243 of the first flow path 241 . That is, the first curved rib 310 and the second curved rib 320 are formed to extend along the circumference of the bell mouth 247 of the upper suction port of the first flow path 241 .

Through this configuration, the flow of air flowing backward around the bell mouth 247 of the upper scroll case 270a is suppressed and, at the same time, air is smoothly sucked into the suction unit 243 of the first flow path 241 to induce noise. The problem can be improved and the air flow resistance is minimized so that the air conditioning performance is not impaired.

As a result, in the first curved rib 310 and the second curved rib 320 , the outside air flowing into the suction part 243 of the first flow path 241 flows back into the suction part 266 of the second flow path 242 . block that The outdoor air introduced into the outdoor air inlet 271 forms a movement path that is almost straight in the downward direction.

Most of this flow of outside air is blown to the air conditioning unit 100 through the first blower wheel 277 inside the first flow path 241, but some of the outside air flows back to the upper side and rides around the bell mouth 247. It may move to the suction part 266 of the 2 flow path 242 . The first curved rib 310 and the second curved rib 320 block the reverse flow of external air flowing into the suction unit 243 of the first flow path 241 into the suction unit 266 of the second flow path 242 . to solve the noise problem.

The first curved rib 310 and the second curved rib 320 are formed to protrude upward from the upper surface of the upper scroll case 270a. In this case, the first curved rib 310 and the second curved rib 320 protrude. The height h2 is equal to or smaller than the protrusion height h1 of the partition wall 265 . Therefore, the upper ends of the first curved rib 310 and the second curved rib 320 do not interfere with the air filter 275 , so that the overall package of the blowing unit 200 is not increased, and within the protrusion height of the partition wall 265 . can faithfully perform the function of preventing backflow of air in

In addition, the first curved rib 310 and the second curved rib 320 are formed at the lower portion of the outdoor air inlet 271 in which the suction part 243 of the first flow path 241 is located based on the partition wall 265 . In addition, the first curved rib 310 and the second curved rib 320 are formed to be less than half of the suction part 243 of the first flow path 241 in the circumferential direction. Therefore, by minimizing the resistance of the air flow through the suction part 243 of the first flow path 241, the outside air can be smoothly sucked and the reverse flow of the outside air can be effectively prevented.

Meanwhile, the first curved rib 310 and the second curved rib 320 are integrally formed to extend from the partition wall 265 , and the first curved rib 310 and the second curved rib 320 are connected to the upper scroll case. Since it is possible to form integrally during injection molding of the upper scroll case 270a, the air backflow prevention unit can be easily implemented without increasing the manufacturing cost only by partially modifying the mold of the upper scroll case 270a.

9 is a view showing the outdoor air mode of the blowing unit according to an embodiment of the present invention.

Referring to FIG. 9 , in the outdoor air mode, the outdoor air door 273 opens the outdoor air inlet 271 and the bet door 274 closes the indoor air inlet 272 . The outdoor air introduced through the outdoor air inlet 271 is introduced through the suction part 243 of the first flow path 241 and is discharged to the interior of the vehicle along the first flow path 241 . In this case, the outside air sucked into the suction unit 243 of the first flow path 241 is directed toward the suction unit 266 of the second flow path 242 by the first curved rib 310 and the second curved rib 320 . backflow is prevented.

10 shows a betting mode of the blowing unit according to an embodiment of the present invention.

Referring to FIG. 10 , in the betting mode, the outside air door 273 closes the outside air inlet 271 and the betting door 274 opens the outside air inlet 272 . The bet introduced through the bet inlet 272 is introduced through the suction unit 266 of the second flow path 242, moves to the lower side, and then turns “U” and is sucked upward through the lower suction port 244 to the second flow path. It is discharged into the vehicle interior along 242 .

11 is a view showing a two-layer flow mode of the blowing unit according to an embodiment of the present invention.

11 , in the two-layer flow mode, the outside air door 273 opens the outside air inlet 271 and the inside door 274 opens the inside air inlet 272 . The outdoor air introduced through the outdoor air inlet 271 is introduced through the suction part 243 of the first flow path 241 and is discharged to the interior of the vehicle along the first flow path 241 .

In addition, the bet introduced through the bet inlet 272 is introduced through the suction unit 266 of the second flow path 242, moves to the lower side, and then turns "U" to be sucked upward through the lower suction port 244 and removed. 2 It is discharged into the vehicle interior along the flow path 242 . In this case, the outside air sucked into the suction unit 243 of the first flow path 241 is directed toward the suction unit 266 of the second flow path 242 by the first curved rib 310 and the second curved rib 320 . backflow is prevented.

12 shows the noise evaluation results of the blowing unit according to the prior art, and FIG. 13 shows the noise evaluation results of the blowing unit according to an embodiment of the present invention.

Referring to FIG. 12, in the case of a conventional blower unit not provided with an air backflow prevention unit, as indicated by a dotted line when the blower wheel is operated in 8 stages for 5 seconds, sudden fan passing frequency noise (BPT) is generated in the approximately 2000 f/Hz section. could be seen to occur. 13, in the case of the blowing unit of the present invention equipped with an air backflow prevention unit, when the blower wheel is operated in 8 stages for 5 seconds, BPT noise does not occur in all sections, and the overall noise is about 1.6 dB compared to the prior art was confirmed to decrease.

Meanwhile, FIG. 14 is a perspective view illustrating a scroll case according to another embodiment of the present invention, and FIG. 15 is a plan view of FIG. 14 . In this embodiment, the configuration of the curved rib is changed compared to the above-described embodiment, and only the changed configuration will be described in detail.

14 and 15 , the scroll case 270 according to another embodiment of the present invention includes an upper scroll case 270a and a lower scroll case 270b. A first flow path 241 is formed in the upper scroll case 270a, and a second flow path 242 is formed in the lower scroll case 270b (refer to the drawings of the above-described embodiment). The upper suction port of the first flow path 241 is formed of a circular hole formed along the bell mouth 247 , and is the same as the suction part 243 of the first flow path 241 .

The scroll case 270 is provided with a partition wall 265 . The partition wall 265 divides the suction part 243 of the first flow path 241 from the suction part 266 of the second flow path 242 . The blowing unit 200 includes an air backflow prevention unit. The air backflow prevention part has a curved rib. The curved rib extends from the partition wall 265 in a streamlined shape along the scroll development direction of the suction part 243 of the first flow path 241 .

A plurality of curved ribs are arranged to be separated from each other in the scroll unfolding direction. In this embodiment, two curved ribs are provided, and are composed of a first curved rib 310 and a second curved rib 320 . The plurality of curved ribs 310 and 320 are formed to have different lengths from each other. That is, the curved rib on the downstream side in the air flow direction of the first flow path 241 is formed to extend longer in the circumferential direction than the curved rib on the upstream side.

More specifically, the first curved rib 310 is formed on the downstream side of the second curved rib 320 in the air flow direction. The first curved rib 310 is formed to extend longer in the circumferential direction than the second curved rib 320 . The outside air flowing along the scroll case 270 of the first flow path 241 has a higher airflow rate on the side going around the bell mouth 247 in the circumferential direction, so there is a high possibility of a reverse flow.

For this reason, by forming the length of the first curved rib 310 to be longer on the downstream side than the start portion of the air flow along the circumferential direction of the scroll case 270 , the reverse flow of air can be more effectively prevented.

Up to now, the blower unit of the vehicle air conditioner according to the present invention has been described with reference to the embodiment shown in the drawings, but this is only an example, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. will be. Accordingly, the true technical protection scope should be determined by the technical spirit of the appended claims.

100: air conditioning unit 200: ventilation unit
241: first euro 242: second euro
243: the suction part of the first flow path (upper suction port)
244: lower inlet 250: dividing wall
265: bulkhead 266: suction portion of the second flow path
270: scroll case
270a: upper scroll case 270b: lower scroll case
271: outside air inlet 272: bet inlet
273: outside door 274: bet door
275: air filter 276: blower motor
277: first blower wheel 278: second blower wheel
281: partition member 282: intake case
310: first curved rib 320: second curved rib

Claims (14)

In the blowing unit of an air conditioner for a vehicle having a scroll case in which a first flow passage and a second flow passage are partitioned so as to separate bet and external air to be sucked, the ventilation unit comprising:
The scroll case is provided with a partition wall dividing the suction part of the first flow path and the suction part of the second flow path;
A blower unit of an air conditioner for a vehicle provided with an air backflow preventing unit in the bulkhead that suppresses a backflow of air flowing into one of the first flow path and the second flow path into the other. According to claim 1,
The first flow path is disposed above the second flow path,
The suction part of the second flow path is formed in a lateral direction of the suction part of the first flow path,
The air backflow prevention unit is a blower unit of an air conditioner for a vehicle that is formed around the suction part of the first flow path. According to claim 1,
Outside air flows through the first flow path and bet air flows through the second flow path, and the air backflow prevention unit blocks the reverse flow of outside air flowing into the suction part of the first flow path into the second flow path. The ventilation unit of the air conditioning system. 4. The method according to any one of claims 1 to 3,
The air backflow prevention unit,
and a curved rib extending from the partition wall along a scroll development direction of the suction unit of the first flow path. 5. The method of claim 4,
The blowing unit of the vehicle air conditioner, characterized in that the plurality of curved ribs are arranged separately from each other in the scroll unfolding direction. 6. The method of claim 5,
The curved ribs extend symmetrically on both sides with respect to the bulkhead and include first curved ribs and second curved ribs that are spaced apart from each other. 4. The method according to any one of claims 1 to 3,
The scroll case is composed of an upper scroll case and a lower scroll case,
The air blower unit of the air conditioner for a vehicle, characterized in that the air backflow prevention part is formed to protrude upward from the upper surface of the upper scroll case. 8. The method of claim 7,
A blower unit for an air conditioner for a vehicle, characterized in that the protrusion height of the air backflow prevention unit is equal to or smaller than the protrusion height of the bulkhead. 4. The method according to any one of claims 1 to 3,
The scroll case includes an upper suction port for introducing air into the first flow path and a lower suction port for introducing air into the second flow path,
The blower unit of the air conditioner for a vehicle, characterized in that the air backflow prevention part is formed to extend along the circumference of the bell mouth of the upper intake port. 10. The method of claim 9,
Air introduced into the suction part of the second flow path is detoured through the lateral flow path of the first flow path, and then is sucked from the lower part to the upper part through the lower suction port. 7. The method of claim 6,
The first curved rib and the second curved rib,
A blower unit of an air conditioner for a vehicle, characterized in that it is formed to be less than half of the suction part of the first flow path in the circumferential direction. 4. The method according to any one of claims 1 to 3,
The suction part of the first flow path is formed below the outdoor air inlet, and the suction part of the second flow path is formed below the indoor air inlet,
The blower unit of the vehicle air conditioner, characterized in that the air backflow prevention part is formed under the outdoor air inlet in which the suction part of the first flow path is located with respect to the partition wall. 6. The method of claim 5,
The plurality of curved ribs are formed to have different lengths from each other. 14. The method of claim 13,
The blowing unit of the air conditioner for a vehicle, characterized in that the curved rib on the downstream side in the air flow direction of the first flow path extends longer in the circumferential direction than the curved rib on the upstream side.

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