JPH09229399A - Indoor unit for air conditioning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively lower the level of noise caused by the rotation of a crossflow fan. SOLUTION: A room unit 1 for air conditioning is provided with a crossflow fan 5 in the body thereof and it is so arranged that the positions of the maximum access parts MA and MB, formed between a tongue part 4A or a backnose 2C provided in proximity to the crossflow fan and the crossflow fan 5, on the circumferential surface of the crossflow fan 5 change in the circumferential direction of the crossflow fan 5. A straightening reinforcing plate 17 is mounted on a drain pan member 14 a part of which acts as tongue part 14C to reduce the quantity of passing air covering a lower part of a heat exchanger 13 while reinforcing and fixing the drain pan member 14.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional air conditioning indoor unit in a housing air conditioner system, a heat exchanger is arranged near the grill of the indoor unit, and indoor air is exhausted from the grill by a cross flow fan provided near the lower part of the heat exchanger. Inhale,
A configuration is known in which sucked indoor air is passed through a heat exchanger and then returned to the room. This structure is often used especially for wall-mounted indoor units.

By the way, in the case of an air conditioning indoor unit using a cross flow fan, a tongue portion and a back nose are arranged in the vicinity of the cross flow fan so as to sandwich the cross flow fan, and a cross flow is provided between them and the cross flow fan. A narrow gap extending in the axial direction is formed along the peripheral surface of the fan, and indoor air is sucked in by using these gaps.

[0004]

As described above, since the tongue portion and the back nose are arranged close to each other in the crossflow fan, a so-called beep sound is generated due to the airflow flowing between them and the fan blades of the crossflow fan. The noise level, which is referred to as the noise level, is generated, and the noise level is related to the relative position between the fan blade and the tongue or the back nose. Therefore, in the case where a part of the drain pan is used as the tongue portion, which is often seen in the case of a wall-embedded thin device, since the drain pan is usually made of a thin resin, the drain pan is easily deformed. However, this causes a problem that noise is increased.

Further, the member providing the tongue is arranged so as to be parallel to the cross flow fan and fixed to the frame of the apparatus or the like, but is formed between the loss flow fan and the member as described above. Since the noise level changes depending on the state of the gap, the mounting and adjustment of the noise level must be accurate, which requires a long time for assembly and causes a cost increase. Even if the assembly is performed correctly, there is a problem such as misalignment during transportation, and if a screwing structure is used to solve this, another problem such as an increase in the number of parts and an increase in the number of assembly steps will occur. Become.

Therefore, an object of the present invention is to provide an air conditioning indoor unit having a structure capable of effectively reducing the noise level generated by the rotation of the cross flow fan.

[0007]

According to a first aspect of the present invention for solving the above-mentioned problems, an indoor unit for air-conditioning in which a crossflow fan is provided in a main body is provided in the vicinity of the crossflow fan. The position of the maximum approaching portion formed between the provided tongue portion or back nose and the crossflow fan on the circumferential surface of the crossflow fan is changed in the circumferential direction of the crossflow fan. . This change may be changed stepwise by providing a step on the tongue or the back nose, or may be continuously changed by twisting the tongue or the back nose.

According to this structure, when the crossflow fan rotates, the phase of the change in the airflow caught between the tongue or the back nose and the crossflow fan by the passage of time changes along the axial direction. Since they are sequentially displaced with each other, the level of noise generated by the airflow passing between the crossflow fan and the tongue or the back nose can be significantly reduced.

According to a second aspect of the present invention, a heat exchanger, a drain pan member disposed near a lower portion of the heat exchanger for receiving condensed water generated in the heat exchanger, and room air are provided. A cross flow fan arranged in the vicinity of the drain pan member for passing through a heat exchanger, and a part of the drain pan member is configured to act as a tongue portion with respect to the cross flow fan. In this case, a flow straightening reinforcing plate for covering the lower portion of the heat exchanger to reduce the amount of passing air and for reinforcing and fixing the drain pan member is attached to the drain pan member.

The rectifying and reinforcing plate may be a plate-shaped member arranged along the longitudinal direction of the drain pan member, for example, and a part of the rectifying and reinforcing plate may cover the outer lower portion of the heat exchanger. By providing such a flow straightening reinforcing plate, the drain pan member can be prevented from being deformed without giving mechanical strength to the drain pan member itself, and the drain pan member can be fixed by the flow straightening reinforcing plate. The required relative positional relationship between the drain pan member acting as a section and the cross flow fan can be stably maintained. In addition, since the flow rate of air in the part near the cross flow fan of the heat exchanger is limited by a part of the rectification reinforcing plate, the air bypass in the place where the intake air front wind speed, which is a characteristic of the cross flow fan, becomes faster. Can be prevented.

According to a third aspect of the present invention, a heat exchanger, a drain pan member disposed near a lower portion of the heat exchanger for receiving condensed water generated in the heat exchanger, and room air are provided. An air conditioner indoor unit, comprising: a cross flow fan arranged in the vicinity of the drain pan member for passing through a heat exchanger; and a part of the drain pan member provided with a portion acting as a tongue portion with respect to the cross flow fan. In the above, a pair of fitting protrusions for positioning in the up-down and front-rear directions are formed at both ends of the drain pan member, and a corresponding dimension for receiving the pair of fitting protrusions on the frame body side of the air conditioning indoor unit. A pair of shaped recesses are formed, and at least one rotation stopping recess corresponding to the shape of the end of the drain pan member is formed on the frame body side.

According to this structure, when the drain pan member is attached to the frame, the pair of fitting protrusions, for example, the columnar protrusions are engaged with the corresponding pair of recesses, respectively, and thereby the frame is attached to the frame. It is possible to easily position the drain pan member in the vertical and longitudinal directions. After that, by fitting the end portion of the drain pan member to the rotation stopper dent portion on the frame body side, anyone can easily attach the drain pan member to the frame body at a predetermined position in a predetermined posture. As a result, it becomes extremely easy to set the three-dimensional relative positional relationship between the tongue portion of the drain pan member and the cross flow fan to a required state, and the relative positional relationship changes due to vibration during transportation. There is nothing to do.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view showing an example of an embodiment of an air conditioning indoor unit according to the invention of claim 1. Reference numeral 1 generally indicates an indoor unit for air conditioning which is connected to an outdoor unit (not shown) by piping and constitutes an air conditioning system. The air-conditioning indoor unit 1 has a casing 2 made of, for example, a synthetic resin material, a heat exchanger 3 is arranged in the casing 2 as shown in the drawing, and is fixed to the casing 2 by known mounting means not shown. The casing 2 is provided with a crosspiece member 4 along the lower edge of the heat exchanger 3 so as to extend over the entire width of the casing 2, and a crosspiece is provided between the crosspiece member 4 and the rear wall portion 2A of the casing 2. The flow fan 5 is rotatably provided.

A cross flow fan 5 is provided inside the crosspiece member 4.
The protrusion is formed so as to project toward, and the protrusion acts as the tongue 4A. On the other hand, a part of the inner surface 2B of the rear wall portion 2A rises in a ridge having a chevron cross section to form a back nose 2C. Therefore, when the crossflow fan 5 is rotationally driven in the arrow X direction by a motor (not shown), the air in the room passes through the heat exchanger 3, where heat is exchanged and enters the casing 2. Then, the air is returned to the room from the air outlet 6 through the gap between the cross flow fan 5 and the back nose 2C.

FIG. 2 shows a region of action for air in the casing 2 when the crossflow fan 5 rotates. The suction region extends from the connection point between the heat exchanger 3 and the crosspiece member 4 to the back nose 2C, and the blow region extends from the back nose 2C to immediately below the crossflow fan 5. Most of the air in this blow region is discharged from the blowout port 6. Returned to the room. The region immediately below the cross flow fan 5 to the tongue portion 4A is a swirl region, and the region from the tongue portion 4A to the connection point between the heat exchanger 3 and the crosspiece member 4 is a transition region. Most of the air in the vortex region is returned to the room from the air outlet 6, but the remaining part of the air is tongue 4A.
And returns to the blow-in area through the gap between the cross flow fan 5 and the cross flow fan 5.

Here, it is known that noise called a so-called beep sound is generated in a narrow portion between the crossflow fan 5 and the tongue portion 4A and a narrow portion between the crossflow fan 5 and the back nose 2C. However, the generation mechanism is explained below.

FIG. 3 shows a cross flow fan 105, a tongue portion 104A and a back nose 102C in the conventional apparatus.
And are shown enlarged. Cross flow fan 105
Is rotated in the X direction, the cross flow fan 105
The blades 5A, 5B, 5C, ... of the cross flow fan 105 face the tongue portion 104A in sequence, and at the same time, the blades 5a, 5b, 5c ,.
It will face C in sequence. Cross flow fan 10
Assuming that the rotation speed of 5 is N (rpm) and the number of blades is Z, the blade passing through the tongue 104A and the back nose 102C is (N / 60) × Z (sheets / second). The level of the beeping sound generated when each one focused wing faces the tongue changes as shown in FIG.
As can be seen from FIG. 4, when the wing makes one revolution,
The noise level suddenly rises at the moment when it faces 04A.
Each wing of the cross flow fan 105 and the back nose 102
A beeping sound generated between C and C is generated similarly.

Thus, the tongue 10 as shown in FIG.
The change in the noise level due to 4A sequentially occurs at each blade with a predetermined time difference, and the back nose 10
Since the change in the noise level due to 2C similarly occurs in each blade, the noise generated as a whole is the sum of these, and the noise level generated by the rotation of the crossflow fan 105 pulsates as shown in FIG. Will be done.

In the air conditioning indoor unit 1 shown in FIG.
In order to reduce the level of noise that accompanies the rotation of the crossflow fan 5 due to the above-described causes, the maximum proximity formed between the tongue portion 4A and the back nose 2C, which are provided close to the crossflow fan 5, respectively. Department MA,
The tongue portion 4A of the crosspiece member 4 and the back nose 2C are twisted so that the position of the MB on the peripheral surface of the cross flow fan 5 does not become parallel to the axial direction thereof but changes in the peripheral direction of the cross flow fan 5. .

FIG. 6 is a view for explaining the above-mentioned twist given to the tongue portion 4A and the back nose 2C shown in FIG. As shown in FIG. 6A, the tongue 4A
And when the vicinity of the cross flow fan 5 including the back nose 2C is viewed in some planes P1, P2, P3, P4, P5 perpendicular to the axis of the cross flow fan 5, the tongue portion 4A and the cross flow in these planes are seen. The positions of the maximum approach points Q1, Q2, Q3, Q4, and Q5 with the fan 5 on the peripheral surface of the crossflow fan 5 are shown in FIG. 6B when the casing 2, the crosspiece member 4, and the crossflow fan 5 are viewed from the side. ), Changes in the circumferential direction of the cross flow fan 5. That is, in the tongue portion 4A, the line connecting the points closest to the crossflow fan 5 extends obliquely across the peripheral surface of the crossflow fan 5.

Referring to FIG. 7, a line connecting the points on the tongue portion 4A of the crosspiece member 4 that are closest to the crossflow fan 5 is shown by reference numeral 4B. It can be seen from FIG. 7 that the line 4B is twisted and continuously extends.

As shown in FIG. 8, the back nose 2C formed in the casing 2 also extends diagonally across the peripheral surface of the cross flow fan 5 in the same manner as in the case where the ridge line 2D is the tongue portion 4A. Is formed in.

According to such a structure, when the cross flow fan 5 rotates, the edge of one blade does not approach the tongue 4A or the back nose 2A over the entire moment at a moment. Since the edge portion sequentially comes closest to the tongue portion 4A from the start, the generation points of the peak level of the beeping sound generated by each blade are uniformly dispersed as shown in FIG.

Since the tongue portion 4A and the back nose 2C are constructed as described above, the noise generation level is averaged as a whole, and the peak level becomes smaller than the noise peak level shown in FIG. That is, the level of noise generated by the rotation of the cross flow fan 5 can be reduced.

In the embodiment described above, the position of the maximum approaching portion formed between the tongue portion 4A and the back nose 2C with the crossflow fan 5 is slanted on the peripheral surface of the crossflow fan 5. Although the case where the tongue portion 4A and the back nose 2C are formed so as to straddle each other has been described, it goes without saying that only one of the tongue portion 4A and the back nose 2C may have the above-described configuration.

Further, the structure of the tongue portion 4A or the back nose 2C is not limited to the above embodiment. For example, FIG.
As illustrated in the case of the tongue portion 4A, the maximum approaching positions of the two do not continuously and diagonally cross the circumferential surface of the crossflow fan 5, but the maximum approaching positions of the two gradually go around the circumferential surface in stages. A configuration in which a step-like portion 4C that shifts in the direction is formed may be used. The same applies to the back nose 2C.

Next, with reference to FIG. 11, an example of the embodiment of the invention of claim 2 will be described. The air conditioning indoor unit 11 shown in FIG. 11 is connected to an outdoor unit (not shown) by piping to form an air conditioning system, and has a casing 12 made of a synthetic resin material. Casing 1
A heat exchanger 13 is arranged in the casing 2 as shown in the drawing, and the heat exchanger 13 is formed by a known means (not shown) in the casing 1.
It is fixed to 2. A drain pan member 14 is provided in the casing 12 along the lower end edge of the heat exchanger 13 so as to cover the entire width of the casing 12, and between the drain pan member 14 and the rear wall portion 12A of the casing 12. The cross flow fan 15 is rotatably provided.

The drain pan member 14 is composed of a gutter-shaped member 14A made as a relatively thin synthetic resin molded product, and a synthetic resin foam member provided so as to wrap the outer periphery of the gutter-shaped member 14A with its upper opening left. And an outer shell member 14B. The condensed water generated in the heat exchanger 13 is collected in the gutter-shaped member 14A of the drain pan member 14.
The gutter-shaped member 14A is connected to a drain hose (not shown),
The condensed water collected in the gutter-shaped member 14A is drained to the outside through a drain hose. A ridge protruding toward the cross flow fan 15 is formed inside the outer member 14B, and the ridge acts as a tongue 14C. In addition, the gutter-shaped member 14A and the outer shell member 14B
The assembly of the drain pan 14 including
B can be formed by forming a dent corresponding to the outer dimension of the trough-shaped member 14A in advance and inserting the trough-shaped member 14A into the dent and fixing it with an adhesive. On the other hand, the rear wall 12
A part of the inner surface 12B of A is raised to a ridge having a chevron cross section to form a back nose 12C.

Therefore, when the cross flow fan 15 is rotationally driven in the direction of arrow X by a motor (not shown), the air in the room is sucked through the heat exchanger 13, and at this time, the heat exchanger 13 performs heat exchange. The air cooled by this heat exchange enters the casing 12. And
It is returned to the room from the air outlet 6 through the gap between the cross flow fan 15 and the back nose 12C.

By the way, in a thin air-conditioning indoor unit for wall hangings, the drain pan member 14 having the above-mentioned structure is used.
Is insufficient in strength, the relative positional relationship between the tongue portion 14C formed on a part of the outer member 14B and the cross flow fan 15 is caused by vibration due to rotation of the cross flow fan 15 or wind pressure generated thereby. It tends to change, which causes the cross flow fan 15 and the tongue portion 16A.
There is a problem that noise is apt to be generated in a narrow portion between and.

Therefore, in the air conditioning indoor unit 11, the flow straightening reinforcing plate 17 is provided on the front surface of the drain pan member 14. The rectification reinforcing plate 17 is a plate-shaped member along the longitudinal direction of the drain pan 14, and can be formed as a plate member made of synthetic resin, for example. This rectification reinforcing plate 17 thereby reinforces the mechanical strength of the drain pan member 14 and can effectively prevent the drain pan member 14 from being deformed even when an external force is applied. The rectification reinforcing plate 17 further extends so as to cover the lower portion of the heat exchanger 13, thereby reducing the amount of air passing through the heat exchanger 13. As a result, the flow amount of air in the portion of the heat exchanger 13 near the cross flow fan 15 is limited by a part of the flow straightening reinforcing plate 17, and the suction air front wind speed that occurs when the cross flow fan 15 is used becomes faster. Air bypass can be prevented. That is, it is possible to effectively prevent the suction air from passing through the lower portion of the heat exchanger 13 in which the heat exchange tube is not arranged.

As a result, the relative positional relationship between the tongue portion 14C and the cross flow fan 15 is kept well in a predetermined state by improving the air blowing performance, the heat exchange performance, and the mechanical strength of the tongue portion. Therefore, it is possible to obtain the effect of helping to reduce noise. As can be seen from the above description, the above-described configuration is particularly effective for an air conditioning indoor unit that uses a thin resin drain pan member and a cross flow fan, thereby increasing the cooling and heating performance and also serving as a tongue. Since the strength of the drain pan member is improved, it is possible to effectively prevent the drain water from flowing out, and it is possible to prevent the displacement of the tongue portion due to the change in the internal pressure, which is useful for preventing the generation of noise and the reduction of the air flow rate.

12 and 13 are views showing an example of the embodiment of the invention of claim 3, and an example of the embodiment of the invention of claim 3 will be described with reference to FIGS. 12 and 13.

The air conditioning indoor unit 21 shown in FIG. 12 also has basically the same configuration as the air conditioning indoor unit 11 shown in FIG. 11, so that FIG.
The same reference numerals are given to the portions corresponding to the respective portions, and the description thereof will be omitted. Reference numeral 24 indicates a heat exchanger 1
3 is a drain pan member provided along the lower edge of the casing 3 so as to cover the entire width of the casing 12. The drain pan member 24 also has the same basic structure as the drain pan member 14 shown in FIG. 11, and includes a gutter-shaped member 24A made of synthetic resin and an outer shell member 24B provided so as to wrap the member. A tongue portion 24C is formed on the outer member 24B. Therefore, detailed description of the basic configuration itself of the gutter-shaped member 24A and the outer member 24B made of synthetic resin will not be repeated here.

In order to allow the drain pan member 24 to be firmly and easily attached to the casing 12 in a predetermined posture, both ends of the drain pan member 24 are
A cylindrical projection 24D, which is a pair of fitting projections used to position the drain pan member 24 in the vertical and front-rear direction with respect to the casing 12, is integrally formed. In FIG.
Only one cylindrical projection 24D provided on the one end 24E of the drain pan member 24 is shown, and the other cylindrical projection 24D paired with this is omitted from the drawing. On the other hand, on the casing 12 side, a pair of recessed portions 12D for receiving these cylindrical protrusions 24D are formed. In FIG. 13, only the recessed portion 12D corresponding to the cylindrical protrusion 24D formed on the one end portion 24E of the drain pan member 24 is shown, and the dimensional shape of the recessed portion 12D corresponds to that of the cylindrical protrusion 24D. Is to be housed within the dent portion 12D. Cylindrical protrusion 2
Since the cross-sectional shape of 4D is a cylinder as described above, by fitting the cylindrical projections 24D at both ends of the drain pan member 24 into the corresponding recessed portions 12D, the positions of the drain pan member 24 in the up, down, front, and back directions with respect to the axis can be determined. Besides being determined, it can be rotated about the axis in the positioning state.

In order for anyone to easily set the three-dimensional relative posture of the drain pan member 24 with respect to the casing 12, a rotation of a size and shape corresponding to the shape of the one end portion 24E of the drain pan member 24 is performed. A stop 12E is formed on the casing 12. The rotation stopping step portion 12E is formed so that the one end portion 24E can be fitted therein by appropriately adjusting the rotational position of the drain pan member 24 when the cylindrical projection 24D is fitted in the recess portion 12D. ing. Anti-rotation step 12
E may be provided on the casing 12 corresponding to the other end (not shown) of the drain pan member 24, but only one rotation stopping step 12E may be provided on either side.

According to this structure, the cylindrical projections 24D at the ends of the drain pan member 24 are inserted into the corresponding recesses 12D to determine the positions in the vertical and longitudinal directions, and at least one end 24E of the drain pan member 24 is rotated correspondingly. The position in the rotational direction can be determined by fitting the stop step portion 12E, and thus the drain pan member 24 can be fixed to the casing 12 in a three-dimensionally predetermined posture by a simple operation. Therefore, the position of the tongue portion 24C of the drain pan member 24 with respect to the cross flow fan 5 can be properly determined and fixed, and thus the assembling work is significantly simplified.

As described above, since the tongue portion, which greatly affects the blowing and noise characteristics, can be reliably assembled and the deviation from the proper tongue position can be prevented, the blowing and
It has the advantages of being able to prevent variations in noise characteristics during mass production, being useful in preventing displacement of the tongue during transportation, and not requiring screws during the mounting process during assembly.

[0040]

According to the invention of claim 1, when the cross-flow fan rotates, the edge of one blade of the cross-flow fan does not approach the tongue or the back nose over its entirety at an instant. However, since this edge portion comes closest to the tongue or the back nose in order from the beginning, the generation points of the peak level of the bee sound generated by each blade are evenly distributed, and the noise generation level is averaged as a whole, The level of noise generated by the rotation of the cross flow fan can be effectively reduced.

According to the second aspect of the present invention, the relative positional relationship between the tongue portion and the cross flow fan is in a predetermined state due to the improvement of the blowing performance, the heat exchange performance, and the increase of the mechanical strength of the tongue portion. Since it is kept well, it is possible to obtain the effect of helping to reduce noise. Furthermore, since the cooling and heating performance is improved and the strength of the drain pan member that also serves as the tongue is improved, drain water can be effectively prevented and the tongue position can be prevented from shifting due to internal pressure changes, and noise can be prevented and sent. This is useful for preventing reduction of air flow.

According to the third aspect of the present invention, since the tongue having a great influence on the air blowing and noise characteristics can be reliably assembled and the variation from the proper tongue position can be prevented, the air blowing and noise can be prevented. In addition to being able to prevent mass production variations in characteristics, it also helps prevent displacement of the tongue during transportation,
Moreover, there is an effect that a screw is not required in the mounting process at the time of assembly.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of an air conditioning indoor unit according to the invention of claim 1.

FIG. 2 is a diagram showing an action area for air in a casing of the air conditioning indoor unit shown in FIG.

FIG. 3 is an explanatory diagram for explaining a noise generation mechanism due to rotation of a cross flow fan.

FIG. 4 is a graph showing how the noise level is periodically changed by one of the blades of the cross flow fan shown in FIG.

5 is a graph showing a temporal change in noise level caused by rotation of the cross flow fan shown in FIG.

6 is an explanatory view for explaining a twist given to a tongue portion and a back nose of the air conditioning indoor unit shown in FIG.

7 is a perspective view of a crosspiece member for showing a twist of a tongue portion of the crosspiece member of FIG. 1;

8 is a perspective view of a main part of the casing for showing a twist of a back nose formed in the casing of FIG.

9 is a graph for explaining how the noise level generated in the air conditioning indoor unit of FIG. 1 changes with time.

10 is a perspective view showing a modified example of a crosspiece member that can be used in place of the crosspiece member shown in FIG.

FIG. 11 is a sectional view showing an example of an embodiment of an air conditioning indoor unit according to the invention of claim 2.

FIG. 12 is a schematic sectional view showing an example of an embodiment of an air conditioning indoor unit according to the invention of claim 3.

FIG. 13 is an enlarged perspective view of a partly sectioned main part showing the structure of the drain pan member of the indoor unit for air conditioning shown in FIG. 12 and the structure for attaching it to the casing.

[Explanation of symbols]

 1, 11, 21 Air-conditioning indoor units 2, 12, Casing 2C, 12C Back nose 2D Ridge line 3, 13 Heat exchanger 4 Cross member 4A, 14C, 24C Tongue 4C Step-shaped part 5, 15 Cross flow fan 12D Dimple Part 12E Rotation stop step 14, 24 Drain pan member 17 Straightening reinforcing plate 24D Cylindrical protrusion 24E One end

Claims (5)

[Claims] 1. In an air conditioning indoor unit in which a crossflow fan is provided in a main body, a maximum formed between a tongue portion or a back nose provided near the crossflow fan and the crossflow fan. An air conditioner indoor unit, wherein a position of an approaching portion on a peripheral surface of the cross flow fan is changed in a circumferential direction of the cross flow fan. 2. A heat exchanger, a drain pan member disposed close to a lower portion of the heat exchanger for receiving condensed water generated in the heat exchanger, and a drain pan member for passing room air through the heat exchanger. A cross-flow fan arranged in the vicinity of a drain pan member, wherein a part of the drain pan member is configured to act as a tongue portion with respect to the cross-flow fan. An air conditioner indoor unit, wherein a straightening reinforcing plate for covering the lower part to reduce the amount of passing air and for reinforcing and fixing the drain pan member is attached to the drain pan member. 3. A heat exchanger, a drain pan member disposed close to a lower portion of the heat exchanger for receiving condensed water generated in the heat exchanger, and a drain pan member for passing room air through the heat exchanger. A cross-flow fan arranged in the vicinity of the drain pan member, wherein both ends of the drain pan member are provided in an indoor unit for air conditioning, wherein a part of the drain pan member is provided with a portion that acts as a tongue for the cross-flow fan. A pair of fitting projections for positioning in the up-down and front-rear directions, and a pair of dents having a corresponding size and shape for receiving the pair of fitting projections on the frame side of the indoor unit for air conditioning. An indoor unit for air conditioning, characterized in that at least one rotation stop dent corresponding to the shape of the end of the drain pan member is formed on the frame body side. 4. A position on the peripheral surface of the crossflow fan of a maximum approaching portion formed between the tongue or back nose and the crossflow fan by twisting the tongue or back nose. Is changed in the circumferential direction of the cross flow fan. 5. A position on the peripheral surface of the crossflow fan of a maximum approaching portion formed between the tongue or back nose and the crossflow fan by providing a step on the tongue or back nose. Is changed in the circumferential direction of the cross flow fan.