JP2000291973A - Indoor unit of air conditioner - Google Patents

Abstract

(57) [Summary] [Problem] To improve the shape of the suction section at the both ends of the rear guider near the side wall and the shape of the ventilation path, to make the air flow near the side wall high static pressure, and to blow out while minimizing the ventilation resistance. Provided is an indoor unit of an air conditioner capable of stabilizing an air volume. SOLUTION: In a suction portion 13 of a rear guider 9, a protruding end portion 13a in which a distance between the suction portion 13 and the cross flow fan 8 is shortest is formed in a longitudinal direction of the rear guider 9, and the rear guider 9 near the side wall 9a is formed. Is formed with an extension 14 extending from the tip 13a, and the shortest distance between the extension 14 and the cross flow fan 8 is longer than the distance between the tip 13a and the cross flow fan 8. This allows
In the vicinity of the side wall, the inflow of air into the suction portion 13 can be promoted, and the flow of air in the vicinity of the side wall 9a can be increased in static pressure, and the amount of blown air can be stabilized while minimizing ventilation resistance. Can be planned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indoor unit of an air conditioner having a cross flow fan called a cross flow fan.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view of an indoor unit of a conventional air conditioner. FIG. 7 is a cross-sectional view taken along line II of FIG. FIG. 7 shows an example of a cross section of an air conditioner including a cross flow blower. An air passage 3 is formed between the inlet 1 and the outlet 2.
An air filter 6 is arranged in the ventilation passage 3. The air filter 6 covers the inner surface of the front cover 4 to the ceiling of the underframe 5 and is detachable.

[0003] A heat exchanger 7 is disposed in front and rear of the ventilation passage 3, and a cross-flow fan 8 is disposed between the heat exchangers 7. Cross flow fan 8
Is formed by combining a plurality of series of impellers in each of which a plurality of blades of a certain length are arranged in a columnar shape in a rotation axis direction. On the back of the cross flow fan 8, a rear guide 9 is provided.
Stabilizers 10 are arranged below the cross flow fans 8, respectively.

[0004] The stabilizer 10 and the rear guider 9 are drain pans for receiving dehumidified water falling from the heat exchanger 7, and are walls forming part of the ventilation path 3. The air that has passed through the heat exchanger 7 and exchanged heat is sent to the outlet 2 by the cross flow fan 8. The wind direction to the room is
It can be adjusted by the wind direction blade 11.

[0005] Due to recent trends in energy saving, air conditioners are also required to have higher performance, and blowers with higher performance are required. To improve the performance of the indoor unit of the air conditioner means to improve the flow characteristics of the ventilation path and reduce the noise, and it is desired to develop a blower having a high air volume and low noise.

[0006] Accordingly, the performance of the blower can be improved by enlarging the heat exchanger 7 and widening the suction port 1 or widening the shortest distance α between the stabilizer 10 and the rear guider 9. Have been.

[0007]

However, in the above-mentioned conventional means for improving the performance, the blower can be improved in performance, but the blower is of a low static pressure type. Therefore, when a large amount of dust and dirt adhere to the air filter 6 at the time of actual use, that is, when the load is high, the amount of blown air is not stable, and the air flow characteristic is deteriorated. Furthermore, "Basabasa"
There is also a problem of causing an intermittent abnormal noise (hereinafter referred to as "basting sound") and increasing noise.

As a characteristic of an air conditioner equipped with a cross flow fan, a two-dimensional flow is formed at the center of the cross flow fan, but the two-dimensional flow is distorted near the side walls at both ends due to the resistance of the side walls. It becomes a three-dimensional flow. For this reason, when a load is applied to the blower, the blowout flow becomes unstable, and particularly in the vicinity of the side wall, the tendency is remarkable, and the flow becomes a three-dimensional unsteady flow. This is considered to be the cause of the rattling sound occurring near the side walls at both ends.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and improves the shape of the suction section at both ends of the rear guider near the side wall and the shape of the ventilation passage to reduce the flow of air near the side wall with high static pressure. It is an object of the present invention to provide an indoor unit of an air conditioner that can stabilize the amount of blown air while minimizing ventilation resistance.

[0010]

In order to achieve the above object, a first indoor unit of an air conditioner according to the present invention comprises a heat exchanger, a cross flow fan, and a cross flow fan inside a box. A rear guide formed at a distal end of a portion opposed to the cross flow fan and having a suction portion extending in a rotation axis direction for sucking air blown by the cross flow fan; and suction to the suction portion opposed to the rear guide. An indoor unit of an air conditioner including a stabilizer forming a ventilation path for guiding a flow out of the box, and side walls disposed at both sides of the rear guider and perpendicular to the rotation axis. In the suction portion, a protruding end portion in which a distance between the suction portion and the cross flow fan is minimized is formed in a longitudinal direction of the rear guider, and a protrusion of the side wall of the rear guider is formed. An extension part extending from the tip is formed on the side, and the shortest distance between the extension and the cross flow fan is longer than the distance between the tip and the cross flow fan. It is characterized by the following.

According to the indoor unit of the air conditioner as described above, since the extending portion is formed in the vicinity of the side wall so as to increase the distance from the cross flow fan, the air flows into the suction portion near the side wall. Therefore, the flow of air in the vicinity of the side wall can be increased. That is,
The blowout air volume can be stabilized while minimizing the ventilation resistance.

In the first indoor unit of the air conditioner, the heat exchanger is disposed in front and rear in the box body, and the extension portion faces the rear heat exchanger, It preferably extends along the slope of the rear heat exchanger. According to the indoor unit of the air conditioner as described above, the flow of the suction flow in the vicinity of the side wall is smooth, and it is possible to prevent the generation of the rattling sound in the vicinity of the side wall.

The distance between the stabilizer near the side wall and the rear guider is made shorter than the distance between the stabilizer near the center in the direction of the rotation axis and the rear guider, so that the width of the ventilation path is reduced. It is preferable to have a portion where is narrowed. According to the indoor unit of the air conditioner as described above, the blowout flow in the ventilation passage has a high static pressure, so that the blowout air volume can be stabilized.

[0014] Further, it is preferable that a portion where the width of the ventilation path is narrowed extends along the direction of air flow in the ventilation path.

It is preferable that the width of the air passage in a portion where the width of the air passage is reduced is at least about の of the width of the air passage in a central portion in the rotation axis direction.
According to the indoor unit of the air conditioner as described above, it is possible to stabilize the blowing air volume while minimizing the ventilation resistance in the ventilation path.

Further, the cross flow fan is formed by combining a plurality of blades each having a predetermined length in a columnar shape with a plurality of impellers arranged in a rotational axis direction. The length is preferably substantially the same as the length of a series of the impeller.

Next, a second indoor unit of the air conditioner according to the present invention is provided with a heat exchanger, a cross flow fan, and a cross flow fan extending in the rotation axis direction of the cross flow fan inside the box. A rear guide formed with a suction portion for sucking the air blown by the flow fan at an end portion of the portion facing the cross flow fan; and a ventilation passage facing the rear guide and guiding a suction flow to the suction portion out of the box body. And an indoor unit of an air conditioner comprising a side wall disposed in a direction perpendicular to the rotation axis on both sides of both ends of the rear guider, wherein the stabilizer near the side wall is provided. The distance between the rear guider,
The width of the ventilation path is reduced by making the distance between the stabilizer and the rear guider at the center in the rotation axis direction shorter. According to the indoor unit of the air conditioner as described above, since the blowout flow in the ventilation passage near the side wall has a high static pressure, it is possible to stabilize the blowout air volume.

In the indoor unit of the second air conditioner, it is preferable that a portion where the width of the ventilation path is narrowed extends along a flow direction of the air in the ventilation path.

It is preferable that the width of the ventilation passage in a portion where the width of the ventilation passage is narrowed is about 1/2 or more of the width of the ventilation passage in a central portion in the rotation axis direction.
According to the indoor unit of the air conditioner as described above, it is possible to stabilize the blowing air volume while minimizing the ventilation resistance in the ventilation path.

Further, the cross flow fan is formed by combining a plurality of blades each having a predetermined length in a columnar shape with a series of impellers in the direction of the rotation axis. The length in the rotation axis direction is preferably substantially the same as the length of a series of the impeller.

Next, a third indoor unit of the air conditioner according to the present invention is provided with a heat exchanger, a cross flow fan, and a cross flow fan extending in the rotation axis direction of the cross flow fan inside the box. A rear guide formed with a suction portion for sucking the air blown by the flow fan at an end portion of the portion facing the cross flow fan; and a ventilation passage facing the rear guide and guiding a suction flow to the suction portion out of the box body. An indoor unit of an air conditioner, comprising: a stabilizer forming a cross section; and a side wall disposed in a direction perpendicular to the rotation axis on both sides of both ends of the rear guider, wherein a downstream area of the cross flow fan is provided. A portion formed on the inner side of the side wall and having a step of two or more steps with respect to the inner side surface of the side wall, wherein the width of the ventilation path is reduced in the rotation axis direction of the cross flow fan. It is characterized by having a minute. According to the indoor unit of the air conditioner as described above, since the turbulence in the direction of the rotation axis of the cross flow fan in the ventilation flow near the side wall is reduced, it is possible to stabilize the ventilation flow.

In the indoor unit of the third air conditioner, the upper surface of the projection forming the first step with respect to the inner surface of the side wall is a concentric circle obtained by enlarging an outer peripheral circle of the cross flow fan. Is preferably formed to include a curved surface shape having the circular arc as an arc line. According to the indoor unit of the air conditioner as described above, in the vicinity of the side wall, the blowout flow changes its direction in the direction of the rotation axis while the wind speed is substantially uniform, and the disturbance in the direction of the rotation axis is further reduced. Can be reduced.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) In this embodiment, since the external perspective view of the air conditioner is the same as FIG. 6, FIG. 6 is used as the external perspective view of the air conditioner according to the first embodiment. FIG. 1A is a cross-sectional view taken along line II of FIG. FIG.
(B) shows the extension 1 of the rear guider 9 shown in FIG.
FIG. 1 (c) is an enlarged view of the vicinity of the extension 4 and FIG.
It is a principal part arrow view from the direction.

The cross flow fan 8 is formed by combining a plurality of impellers 8a arranged in a columnar shape in the direction of the rotation axis by providing a plurality of blades 8b of a fixed length between the partition disks 8c. Cross flow fan 8
The rear guide 9 extending in the direction of the rotation axis has a suction portion 13 formed at the end thereof to face the cross flow fan 8. The air that has passed through the heat exchanger 7 flows into the suction section 13. Side walls 9a are formed beside the rear guider 9 and both ends of the cross flow fan 8 in the rotation axis direction of the cross flow fan 8. The sectional view shown in FIG. 1A is a sectional view near the side wall (the same applies to FIGS. 2 to 5 below).

As shown in FIG. 1B, the suction portion 13 has a curved protruding end portion 13a. Tip 1
An extension 14 extends from 3a. This extension 1
4 is formed so as to become a part of a cylindrical shape by making the outer peripheral surface 14a substantially the same shape as the curved surface shape of the protruding end portion 13a. Cross flow fan 8 in extension portion 14
Is greater than the distance β between the tip of the tip 13a and the cross flow fan 8 (γ> β). That is, the distance β is the shortest distance in the suction part 13 and the extension part 14.

As shown in FIG. 1C, the extending portions 14 are formed near both ends of the cross flow fan 8 in the rotation axis direction, that is, near the side wall 9a. FIG.
7C, a line 15 indicates an end on the right side when viewed from the front of the cross flow fan 8, and a part of the side wall 9a has a cylindrical recess 9b in which the end of the cross flow fan 8 is housed. The horizontal line on the left side of the view of arrow B of the extension portion 14 in FIG. 1C (hatched portion) is the view of arrow B of the suction portion 13 in FIG. 1B.

In the present embodiment, the dimension 16 indicating the length in the longitudinal direction of the extension portion 14 is substantially the same as the length of a series 8 a of the impeller forming the cross flow fan 8.
FIG. 1C shows the right end when viewed from the front of the cross flow fan 8, but the same applies to the left end.

According to the present embodiment, since the extending portion 14 is formed near the side wall 9a so as to increase the distance from the cross flow fan 8, the flow of air into the suction portion 13 is promoted near the side wall 9a. Therefore, the flow of air near the side wall 9a can be increased to a high static pressure. That is, it is possible to stabilize the blown air volume while minimizing the ventilation resistance.

(Embodiment 2) In this embodiment, since the external perspective view of the air conditioner is the same as FIG. 6, FIG. 6 is used as the external perspective view of the air conditioner according to the second embodiment. FIG. 2A is a cross-sectional view taken along line II of FIG. FIG.
(B) is an essential part arrow view of the vicinity of extension part 18 from the B direction.

The rear guide 9 extending in the direction of the rotation axis of the cross flow fan 8 has a suction portion 17 formed at the end thereof to face the cross flow fan 8. The air that has passed through the heat exchanger 7 flows into the suction section 17. At the tip 17a, the distance between the suction portion 17 and the cross flow fan 8 is the shortest. An extension 18 extends from the tip 17a. The distance between the extension 18 and the cross flow fan 8 is larger than the distance between the protruding end 17a and the cross flow fan 8, as in the first embodiment.

The extension 18 is opposed to the heat exchanger 7a on the back side and extends along the slope of the heat exchanger 7a. In addition, as shown in FIG.
The cross-flow fan 8 is formed near both ends in the rotation axis direction, and its axial dimension 16 is set to be substantially the same as the length of the series 8 a of the impeller of the cross-flow fan 8.

In FIG. 2B, the line 15 indicates the right end when viewed from the front of the cross flow fan 8, and the side wall 9a
Is provided with a cylindrical recess 9b in which the end of the cross flow fan 8 is housed. The horizontal line on the left side of the view of the extension portion 18 as viewed from the direction of the arrow B in FIG. FIG. 2B shows the right end when viewed from the front of the cross flow fan 8, but the same applies to the left end in the vicinity of the side wall 9 a of the rear guider 9 according to the present embodiment. Is formed with an extended portion 18 extending a distance from the cross flow fan 8 and extending along the inclination of the heat exchanger 7a.
The flow of the suction flow in the vicinity of a becomes smooth. For this reason,
It is possible to prevent the generation of a rattling sound near the side wall 9a.

(Embodiment 3) In this embodiment, since the external perspective view of the air conditioner is the same as FIG. 6, FIG. 6 is used as the external perspective view of the air conditioner according to the third embodiment. FIG. 3A is a cross-sectional view taken along line II of FIG. FIG.
(B) is a main part arrow view from the C direction near the outlet 2. FIG.

The rear guide 9 and the stabilizer 10 are opposed to each other, and a ventilation path 3 is formed in a space formed at the opposed portion. The tip of the ventilation path 3 is the air outlet 2. In the present embodiment, projections 19 are formed at both ends in the longitudinal direction of the stabilizer 10. For this reason, the shortest distance α2 of the outlet 2 at the portion where the protrusion 19 is formed is shorter than the shortest distance α1 of the ventilation passage 3 at the center.

FIG. 3B shows the position of the projection 19 in the longitudinal direction of the stabilizer 10. FIG.
The hatched portion in (b) is a view of the projection 19 as seen from the arrow C. The length 16 of the projection 19 in the longitudinal direction is preferably substantially the same as the length of a series 8 a of the impeller forming the cross flow fan 8. FIG. 3B shows the right end when viewed from the front of the cross flow fan 8, but the same applies to the left end.

In this embodiment, by forming the projection 19 and making the shortest distance α2 of the outlet 2 shorter than the shortest distance α1 at the center, the blowout flow at the side wall 9a becomes high in static pressure. It is possible to stabilize the blowing air volume while minimizing the amount.

(Embodiment 4) In this embodiment, since the external perspective view of the air conditioner is the same as that of FIG. 6, FIG. 6 is used as the external perspective view of the air conditioner according to Embodiment 4. FIG. 4A is a cross-sectional view taken along line II of FIG. FIG.
(B) is a main part arrow view from the C direction near the outlet 2. FIG.

In this embodiment, projections 20 are formed at both ends of the outlet 2 in the longitudinal direction. The protrusion 20 is formed along the direction of air flow in the ventilation path 3. The width of the ventilation passage 3 at the portion where the protrusion 20 is formed is preferably about 約 or less of the width of the ventilation passage 3 at the center in the rotation axis direction of the cross flow fan 8. In this embodiment,
The shortest distance α3 of the ventilation path 3 is about の of α4.

FIG. 4B shows the position of the projection 20 in the longitudinal direction of the rear guide 9. The hatched portion in FIG. 4B is a view of the projection 20 as seen from the arrow C.
The length 16a in the longitudinal direction of the projection 20 is １ ／ of the length of a series 8a of the impeller forming the cross flow fan 8.
The length is preferably about 1/6. FIG. 4 (b)
Shows the right end when viewed from the front of the cross flow fan 8, but the same applies to the left end.

In the present embodiment, a projection 20 is further provided in the vicinity of the side wall 9a of the outlet 2, so that the rear guider 9 is provided.
The flow of the exfoliated air blown out along the air can be smoothed, and the noise can be reduced. Further, since the flow from the upper half is secured, the ventilation resistance can be minimized.

(Embodiment 5) In this embodiment, since the external perspective view of the air conditioner is the same as that of FIG. 6, FIG. 6 is used as the external perspective view of the air conditioner according to the fourth embodiment. FIG. 5A is a cross-sectional view taken along line II of FIG. FIG.
(B) is a main part arrow view from the C direction near the outlet 2. FIG. FIG. 5C is a cross-sectional view taken along line II-II of FIG.

The downstream side wall 9a of the cross flow fan 8
Has a projection 21 formed over the entire width of the ventilation path 3. As shown in FIG. 5C, the protrusions 21 are formed on the side walls 9a.
Has a first step 21a and a second step 21b with respect to the inner side surface of the. Reference numerals 16b and 16c indicate the lengths of the steps 21a and 21b in the rotation axis direction of the cross flow fan 8, respectively.

Since the projection 21 has such a two-level step, the width of the ventilation passage 3 in the rotation axis direction of the cross flow fan 8 is reduced to two levels. As a result, the fluctuation component of the airflow blown by the crossflow fan 8 in the direction of the rotation axis is reduced, so that the flow of the blowout flow can be made smooth and noise can be reduced.

In this embodiment, as shown in FIG. 5A, the upper surface of the projection 21 forming the first step 21a is
The cross flow fan 8 is formed so as to include a curved surface shape having an arc of a concentric circle obtained by enlarging the outer peripheral circle of the cross flow fan 8. As a result, in the vicinity of the side wall 9a, the blowout flow changes its direction in the direction of the rotation axis while the wind speed is substantially uniform. That is, the turbulence (fluctuation) component in the rotation axis direction can be further reduced, and the flow of the blowout flow can be made smoother, so that noise can be reduced.

In this embodiment, the example in which the projection has two steps is shown. However, if the step has two or more steps, the same effect can be obtained.

[0047]

As described above, according to the indoor unit of the air conditioner of the present invention, the rear guide is formed with the extension extending from the protruding end near the side wall next to the rear guide. In the vicinity, the inflow of air into the suction portion can be promoted, and the flow of air in the vicinity of the side wall can be increased. That is, it is possible to stabilize the blown air volume while minimizing the ventilation resistance.

Since the stabilizer and the rear guide have a portion near the side wall where the width of the air passage formed opposite to each other is reduced, the blowout flow in the air passage near the side wall becomes high static pressure. Can be obtained.

[Brief description of the drawings]

1A is a cross-sectional view of an indoor unit of an air conditioner according to a first embodiment of the present invention. FIG. 1B is an enlarged view of the vicinity of a rear guider tip in FIG. 1A. FIG. View from the arrow

2A is a cross-sectional view of an indoor unit of an air conditioner according to Embodiment 2 of the present invention. FIG. 2B is a view as seen from a direction B in FIG. 2A.

3A is a sectional view of an indoor unit of an air conditioner according to Embodiment 3 of the present invention. FIG.

4A is a cross-sectional view of an indoor unit of an air conditioner according to Embodiment 4 of the present invention. FIG. 4B is a view as seen from a direction C in FIG. 4A.

5A is a cross-sectional view of an indoor unit of an air conditioner according to Embodiment 5 of the present invention. FIG. 5B is a view taken in the direction of arrow C in FIG. 5A. Sectional view along line -II

FIG. 6 is an external perspective view of an indoor unit of an air conditioner according to a conventional example.

FIG. 7 is a sectional view taken along line II of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet 2 Outlet 3 Ventilation path 4 Front cover 5 Main body frame 6 Air filter 7, 7a Heat exchanger 8 Cross flow fan 8a A series of impellers 8b Blade 9 Rear guide 9a Side wall 9b Cylindrical recess 10 Stabilizer 11 Winding blade 12, 13, 17 Suction portion 13a, 17a Protruding end portion 14, 18 Extension portion 15 End portion of rear guider 16 Length of extension portion in width direction 19, 20, 21 Projection 21a First step 21b Second step

Claims (12)

[Claims] 1. A cross flow fan comprising: a heat exchanger; a cross flow fan; and a suction portion which extends in a rotation axis direction of the cross flow fan and sucks air blown by the cross flow fan. A rear guider formed at the end of the facing portion, a stabilizer facing the rear guider and forming a ventilation path for guiding a suction flow to the suction portion out of the box, and a stabilizer formed at both sides of the rear guider. An indoor unit of an air conditioner having a side wall disposed in a direction perpendicular to a rotation axis, wherein a distance between the suction unit and the cross flow fan is minimized in the suction unit. A protruding portion is formed in a longitudinal direction of the rear guider, and an extension portion extending from the protruding portion is formed near the side wall of the rear guider, and the extension portion and the crossflow fan Wherein the shortest distance is longer than the distance between the tip and the cross flow fan. 2. The heat exchanger is disposed in front and rear of the inside of the box, and the extending portion is opposed to a rear heat exchanger and extends along an inclination of the rear heat exchanger. The indoor unit of the air conditioner according to claim 1, wherein: 3. The width of the ventilation path by making the distance between the stabilizer near the side wall and the rear guider shorter than the distance between the stabilizer and the rear guider at the center in the rotation axis direction. The indoor unit for an air conditioner according to claim 1 or 2, wherein the indoor unit has a portion that is narrowed. 4. A portion of the ventilation passage having a reduced width extends along the direction of air flow in the ventilation passage.
An indoor unit for an air conditioner according to item 1. 5. The air according to claim 4, wherein the width of the ventilation path in a portion where the width of the ventilation path is reduced is about 約 or more of the width of the ventilation path in a central portion in the rotation axis direction. The indoor unit of the harmonizer. 6. The cross-flow fan is formed by combining a plurality of blades each having a certain length in a columnar shape with a plurality of impellers arranged in a rotational axis direction, and extending the extension portion in the rotational axis direction. The indoor unit of an air conditioner according to any one of claims 1 to 5, wherein a length is substantially the same as a length of a series of the impeller. 7. A cross flow fan comprising: a heat exchanger; a cross flow fan; and a suction portion which extends in a rotation axis direction of the cross flow fan and sucks air blown by the cross flow fan. A rear guider formed at the end of the facing portion, a stabilizer facing the rear guider and forming a ventilation path for guiding a suction flow to the suction portion out of the box, and a stabilizer formed at both sides of the rear guider. An indoor unit of an air conditioner having a side wall disposed in a direction perpendicular to a rotation axis, wherein a distance between the stabilizer and the rear guider near the side wall is
An indoor unit for an air conditioner, comprising: a portion in which the width of the ventilation path is reduced by making the distance between the stabilizer and the rear guider at the center in the rotation axis direction shorter. 8. The air passage having a reduced width extends in a direction in which air flows in the air passage.
An indoor unit for an air conditioner according to item 1. 9. The air according to claim 8, wherein the width of the air passage in a portion where the width of the air passage is narrowed is about 1/2 or more of the width of the air passage in a central portion in the rotation axis direction. The indoor unit of the harmonizer. 10. The cross flow fan is formed by combining a plurality of blades having a certain length arranged in a columnar shape with a plurality of impellers in a rotation axis direction, and a portion where a width of the ventilation passage is reduced. The indoor unit of an air conditioner according to claim 7, wherein the length in the rotation axis direction is substantially the same as the length of a series of the impeller. 11. A cross flow fan, comprising: a heat exchanger, a cross flow fan, and a suction portion extending in a rotation axis direction of the cross flow fan and sucking air blown by the cross flow fan. A rear guider formed at the end of the facing portion, a stabilizer facing the rear guider and forming a ventilation path for guiding a suction flow to the suction portion out of the box, and a stabilizer formed at both sides of the rear guider. An indoor unit of an air conditioner having a side wall disposed in a direction perpendicular to a rotation axis, the downstream unit of the cross flow fan being formed inside the side wall and an inner surface of the side wall. The air conditioner indoor unit has a portion in which the width of the ventilation passage is reduced in the rotation axis direction of the cross flow fan by a projection having two or more steps. . 12. An upper surface of the projection forming a first step with respect to an inner surface of the side wall so as to include a curved surface having an arc of a concentric circle obtained by enlarging an outer peripheral circle of the cross flow fan. The indoor unit of the air conditioner according to claim 11, wherein the indoor unit is formed.