WO2018029877A1

WO2018029877A1 - Indoor unit and air-conditioning device

Info

Publication number: WO2018029877A1
Application number: PCT/JP2017/005719
Authority: WO
Inventors: 佐藤　大和; 一浩土橋; 尾原　秀司
Original assignee: 日立ジョンソンコントロールズ空調株式会社
Priority date: 2016-08-10
Filing date: 2017-02-16
Publication date: 2018-02-15
Also published as: JP6758992B2; JP2018025356A

Abstract

The purpose of the present invention is provide an indoor unit of an air-conditioning device which, by suppressing airflow turbulence caused by an electrical component box, improves the areas of uneven airflow at the opening of the bell mouth, improving the efficiency of the centrifugal fan and reducing noise. In order to achieve this purpose, the indoor unit of the present invention comprises: a motor that generates rotational driving force; a centrifugal fan mounted to the motor, and which blows out air sucked in from beneath, in the circumferential direction; a bell mouth for smoothly introducing airflow to said centrifugal fan; an electrical component box mounted on the upstream side of the bell mouth; and a deflection plate that guides the airflow which flows from the edge in the longitudinal direction to the center along the side surface of the electrical component box, to the central part of the opening of the bell mouth.

Description

Indoor unit and air conditioner

The present invention relates to an indoor unit and an air conditioner.

In the abstract of Patent Document 1, FIG. 1 and the like, there is a centrifugal fan provided with a bell mouth that guides air sucked through the bell mouth suction port with respect to the fan suction port formed at the center of the rotor. In the bell mouth, an air conditioner is disclosed in which an airflow guide portion that guides the intake air to the bell mouth suction port is formed on the surface on the suction side.

JP 2009-24595 A

The housing dimensions of indoor units are smaller than in the past, and various parts such as fans and heat exchangers must be installed in a limited space. The air taken in the indoor unit passes through a filter for removing dust and the like contained in the air, and is then sucked into the centrifugal fan. In order to reduce the pressure loss and improve the dust collection capacity of the filter, it is necessary to make the area through which the air passes as large as possible. By making the filter square, it is possible to increase the area within a limited space. There are things to do. On the other hand, the outer diameter of the centrifugal fan needs to ensure a certain distance from the heat exchanger arranged so as to surround the periphery.

From this, the suction port area of the centrifugal fan may be smaller than the area of the filter, and it passes through the square filter and is sucked into the circular centrifugal fan. Inside a narrow indoor unit, it is difficult to ensure a sufficient distance from the filter to the suction port of the centrifugal fan. Therefore, even if a bell mouth is installed to smoothly introduce the air taken into the indoor unit to the centrifugal fan. Due to the difference in shape between the suction port of the filter and the centrifugal fan, the air flow is sucked into the centrifugal fan while being biased in the circumferential direction of the bell mouth. This reduces the efficiency of the centrifugal fan and increases noise. In Patent Literature 1, an airflow guide portion that guides intake air to the bellmouth suction port is formed on the suction side surface of the bellmouth to suppress the bias of the airflow, thereby improving the above-described problem.

Here, in recent indoor units of air conditioners, in consideration of maintainability after installation, there is an increasing configuration in which an electrical component box storing an electrical base is installed at a suction port of a centrifugal fan. However, the turbulence of the airflow that occurs when the electrical component box is installed at the inlet of the bellmouth cannot be sufficiently suppressed by the airflow guide portion formed on the surface of the bellmouth.

Therefore, an object of the indoor unit of the present invention is to provide an air conditioner that suppresses the disturbance of the air flow caused by the electrical component box installed in the suction port of the bell mouth and improves the efficiency of the centrifugal fan and reduces the noise. .

In order to solve the above-described problems, an indoor unit of the present invention includes a motor that generates a rotational driving force, a centrifugal fan that is attached to the motor and discharges air sucked from below in a circumferential direction, and air flow smoothly to the centrifugal fan. A bell mouth for introducing into the bell mouth, an electrical component box attached to the upstream side of the bell mouth, and an airflow flowing from the longitudinal end toward the center along the side of the electrical component box, And a rectifying member that leads to the center side of the opening.

According to the present invention, by suppressing the turbulence of the airflow caused by the electrical component box, it is possible to suppress the uneven suction of the centrifugal fan, and to improve the efficiency and reduce the noise of the centrifugal fan.

It is a perspective view of the indoor unit of an air conditioner. It is the figure which showed the AA cross section of FIG. FIG. 3 is a view showing a BB cross section of FIG. 2. FIG. 4 is a view showing a CC cross section of FIG. 3. FIG. 4 is a view showing a DD section of FIG. 3. It is the figure which showed the structure which attached the electrical component box which does not overlap with a bellmouth opening part. FIG. 7 is a diagram showing a cross section taken along line EE shown in FIG. 6. It is the figure which showed the structure inside the indoor unit of Example 1. FIG. It is the figure which showed the structure inside the indoor unit of Example 2. FIG. It is the figure which showed the structure inside the indoor unit of Example 3. FIG. It is the figure which showed the structure inside the indoor unit of Example 3. FIG. It is the figure which showed the structure inside the indoor unit of Example 3. FIG. It is the figure which showed the structure inside the indoor unit of Example 4. FIG. It is the figure which showed the structure inside the indoor unit of Example 5. FIG. It is the figure which showed the electrical component box, the rectification | straightening member, and the bellmouth in the FF cross section shown in FIG. 10 is a perspective view of Example 5. FIG. It is the figure which showed the structure inside the indoor unit of Example 6. FIG. It is the figure which showed the electrical component box, the rectification | straightening member, and the bellmouth in the GG cross section shown in FIG. 10 is a perspective view of Example 6. FIG.

First, a conventional air conditioner indoor unit will be described with reference to FIGS.

FIG. 1 is a perspective view showing the appearance of a conventional air conditioner indoor unit. The indoor unit is connected to an outdoor unit (not shown) via a refrigerant pipe to constitute an air conditioner. The outdoor unit has a built-in compressor, the refrigerant is compressed by the compressor, and circulates in the refrigerant pipe to form a refrigeration cycle.

As shown in FIG. 1, the indoor unit includes a casing 1 disposed in the ceiling and a panel 2 attached to the indoor side of the casing 1. The panel 2 is provided with four grills 3 for taking in air and four outlets 4 for blowing the air sucked from the grill 3 into the room. A louver 5 is attached to each outlet 4 to adjust the direction of air blowing.

FIG. 2 is a cross-sectional view showing the AA cross section of FIG. Inside the housing 1 of the indoor unit, a motor 40 that generates a rotational driving force, and a centrifugal device that is attached to the motor 40 and discharges air sucked from below through the grill 3, the filter 8, and the bell mouth 9 in the circumferential direction. A fan 6 and a heat exchanger 7 arranged so as to surround the centrifugal fan 6 in the blowing direction of the centrifugal fan 6 are arranged. The air blown by the centrifugal fan 6 passes through the heat exchanger 7 and is blown into the room from the outlet. During the cooling operation, water condensed on the heat exchanger 7 is stored in the drain pan 41 so as not to fall into the room. When a certain amount of water accumulates in the drain pan 41, the water is discharged outside by a drain pump (not shown). In the following, the flow of air by the centrifugal fan 6 is referred to as an air flow 50, and a straight line that serves as an axis of rotation of the centrifugal fan is referred to as a rotation axis Z.

First, details of the flow field in the first aspect of the conventional indoor unit will be described with reference to FIGS. In this indoor unit, the electrical component box 10 is relatively large, and the electrical component box 10 and the bell mouth opening 91 overlap each other.

FIG. 3 is a plan view of the section BB in FIG. 2 and shows only the bell mouth 9 and the electrical component box 10. As shown here, among the airflow 50 passing through the filter 8, the airflow 51 that has passed through the filter 8 at the lower part of the electrical component box 10 extends from the left and right ends of the electrical component box 10 along the side surface of the electrical component box 10. It goes to the center of the electrical component box 10 while vortexing, collides with the air flow 51 coming from the other end near the center, changes direction, and flows into the centrifugal fan 6. That is, since the electrical component box 10 is provided at the suction port of the bell mouth 9, the airflow 51 is greatly disturbed.

FIG. 4 is a cross-sectional view showing the CC cross section of FIG. As shown here, at the end of the electrical component box 10, most of the airflow 51 is peeled off by the electrical component box 10, and the side surface of the electrical component box 10 moves toward the center while swirling. A part of the air flow 51 is directly sucked into the centrifugal fan 6 from the vicinity of the CC cross section, but the ratio is small, and the illustration in FIG. 4 is omitted.

FIG. 5 is a cross-sectional view showing a DD cross section of FIG. As shown here, a vortex due to the separation of the airflow 51 is generated on the side surface of the electrical component box 10 even in the center of the electrical component box 10. In addition to this, a complicated flow field is generated at the center of the electrical component box 10 due to collision between the airflows 51 flowing from the longitudinal ends of the electrical component box 10 and separation of the airflow 51. As a result, the speed and pressure in the vicinity of the center of the electrical component box 10 are reduced as compared with the surroundings, thereby generating a non-uniform flow field in the circumferential direction of the bell mouth opening 91 and reducing the efficiency of the centrifugal fan 6. It is a factor.

Next, details of the flow field in the second mode of the conventional indoor unit will be described with reference to FIGS. In this indoor unit, the electrical component box 10 is relatively small, and the electrical component box 10 and the bell mouth opening 91 do not overlap.

The flow fields shown in FIGS. 3 to 5 are based on a configuration in which the electrical component box 10 and the bell mouth opening 91 overlap, but as shown in FIG. 6, the electrical component box 10 and the bell mouth opening 91 do not overlap. Even if it is a structure, the airflow 51 which goes to the center from the longitudinal direction edge part of the electrical component box 10 arises, and a big disturbance arises in the airflow 51 for the same reason demonstrated in FIG.

FIG. 7 is a view showing the EE cross section shown in FIG. As shown here, even if the electrical component box 10 and the bell mouth opening 91 do not overlap, the longitudinal end of the electrical component box 11 is located at the center of the electrical component box 10 as in the flow field shown in FIG. A complicated flow field is generated by collision between the airflows 51 flowing in from the section and separation of the airflow 51.

That is, as long as the electrical component box 10 is attached to the suction side of the bell mouth 9, a similar flow field is generated regardless of the positional relationship between the electrical component box 10 and the bell mouth opening 91. By making the value small, it is not possible to suppress the occurrence of the turbulence of the airflow 51 due to the installation of the electrical component box 10.

In the following, an embodiment of the present invention will be described focusing on features of the indoor unit as a configuration for solving this problem.

FIG. 8 is a diagram illustrating an internal configuration of the indoor unit according to the first embodiment, and is a plan view of the indoor unit at a height where the electrical component box 10 is installed. Note that the description of points in common with the description of FIGS. 1 to 7 is omitted.

FIG. 8 is a plan view of the section BB in FIG. 2, and shows only the bell mouth 9, the electrical component box 10, and the current plate 20 extracted. As shown here, in the present embodiment, the rectifying plate 20 constituted by a single plane having a length reaching the outer periphery of the bell mouth opening 91 with the tip directed to the rotation axis Z is provided on the side surface of the electrical component box 10. It is attached in two places. The turbulent flow caused by the separation of the airflow 51 from the electrical component box 10 by guiding the airflow 51 flowing from both ends of the electrical component box 10 toward the center of the bell mouth opening 91 by the two rectifying plates 20. And the occurrence of turbulence due to the collision of the airflow 51 flowing in from the left and right end portions at the center, and the airflow 51 is smoothly introduced to the centrifugal fan 6. Thereby, the efficiency improvement and noise reduction of the centrifugal fan 6 are realizable.

Here, it is desirable that the height of the rectifying plate 20 is equal to that of the electrical component box 10, but when lower than that, it is desirable to place the rectifying plate 20 close to the bell mouth 9 side.

The cross-sectional shape of the rectifying plate 20 may be different from that shown in FIG.

For example, in FIG. 8, the length of the rectifying plate 20 is the length that reaches the outer periphery of the bell mouth opening 91, but it may be longer than this and extend to the inside of the bell mouth opening 91. In this case, since the airflow 51 can be more accurately directed to the rotation axis Z, the rectification effect can be further enhanced.

Further, for example, in FIG. 8, the direction of the rectifying plate 20 is the direction toward the rotation axis Z, but the direction may be perpendicular to the side surface of the electrical component box 10. In this case, although the rectifying effect is inferior to that of FIG. 8, the mounting structure is simplified and the mounting operation is facilitated, so that the manufacturing cost can be reduced and the manufacturing work efficiency can be improved.

Further, for example, in FIG. 8, the rectifying plate 20 is configured as a plane, but may be configured as a curved surface. In this case, since the direction of the airflow 51 flowing through the side surface of the electrical component box 10 can be changed more smoothly, the turbulence of the airflow can be further reduced. In addition, the length of the current plate 20 formed of a curved surface may be a length that reaches the bell mouth opening 91 or may be longer than that. Moreover, it is good also as a structure which makes only the base of the baffle plate 20 into a curved surface, and makes the front-end | tip flat.

Further, for example, the current plate 20 in FIG. 8 is configured by a single plane, but may be configured by combining a plurality of planes. In this case, since the direction of the airflow 51 flowing through the side surface of the electrical component box 10 can be changed more smoothly, the turbulence of the airflow can be further reduced.

According to the configuration of the present embodiment described above, by suppressing the turbulence of the air flow caused by the electrical component box, it is possible to suppress the uneven suction of the centrifugal fan, and to improve the efficiency and reduce the noise of the centrifugal fan.

In the above embodiment, the centrifugal fan 6, the bell mouth 9, and the indoor unit including the electrical component box 10 provided between the bell mouth 9 and the filter 8 have been described. However, the centrifugal fan 6 and the bell mouth are described. 9, and even if there is no electrical box 10 between the bell mouth 9 and the filter 8, an air flow 51 is generated from the end of the same shape as the electrical box 10 to the center, thereby the bell mouth. The present invention can be applied to any indoor unit that has a structure in which an uneven flow field is generated in the opening 91 and the efficiency of the centrifugal fan 6 is reduced.

Also, the rectifying member need not be a separate member from the electrical component box 10 or the bell mouth 9, and may be integrally formed with either one or both.

FIG. 9 is a diagram illustrating an internal configuration of the indoor unit according to the second embodiment. In the first embodiment, the rectifying plate 20 is provided on the side surface of the electrical component box 10, but in this embodiment, a rectifying member 21 made of a polygonal column is used instead of the rectifying plate 20. Note that the description of the points in common with the first embodiment will be omitted.

FIG. 9 is a plan view looking up at the BB cross section of FIG. 2, and shows only the bell mouth 9, the electrical component box 10, and the rectifying member 21 extracted. As shown here, in this embodiment, the triangular columnar rectifying member 21 having a slope that reaches the outer periphery of the bell mouth opening 91 with the tip directed to the rotation axis Z is provided on the side surface of the electrical component box 10. It is attached in two places. By these two rectifying members 21, the airflow 51 flowing from both ends of the electrical component box 10 is guided toward the center of the bell mouth opening 91, so that the turbulent flow caused by the separation of the airflow 51 from the electrical component box 10. And the occurrence of turbulence due to the collision of the airflow 51 flowing in from the left and right end portions at the center, and the airflow 51 is smoothly introduced to the centrifugal fan 6.

Here, it is desirable that the height of the rectifying member 21 is equal to that of the electrical component box 10, but when the height is lower than that, it is desirable to place the rectifying member 21 close to the bell mouth 9 side.

Further, in this embodiment, since the triangular columnar rectifying member 21 is used, unlike the first embodiment, the air flow 51 wraps around the back side of the rectifying plate 20 and vortex is not generated. That is, by using the rectifying member 21 of the present embodiment, generation of turbulent flow can be further suppressed as compared with the case where the rectifying plate 20 is used.

Here, the rectifying member 21 of the present embodiment may have a hollow inside, and a temperature sensor such as a thermistor may be disposed in the hollow. By arranging the thermistor here, the observation target temperature can be accurately measured without being affected by the airflow 50 or the airflow 51.

The cross-sectional shape of the rectifying member 21 may be different from that shown in FIG.

For example, in the rectifying member 21 in FIG. 9, the guide surface for guiding the air flow 51 is a flat surface, but it may be a curved surface. In this case, since the direction of the airflow 51 flowing through the side surface of the electrical component box 10 can be changed more smoothly, the turbulence of the airflow can be further reduced. It should be noted that the length of the guide surface constituted by a curved surface may be a length reaching the bell mouth opening 91 or may be longer than that. Further, only the base of the guide surface may be a curved surface and the tip may be a flat surface.

For example, in FIG. 9, the cross section of the rectifying member 21 is a right triangle, but the shape of the surface that is not the guide surface can be arbitrarily set, and may be an isosceles triangle. In this case, since the separation of the airflow 51 along the downstream side surface can be suppressed as compared with the configuration of FIG. 9, the generation of turbulence can be further suppressed, and the direction of attachment when the rectifying member 21 is attached in the manufacturing process. There is also the effect of improving production efficiency because there is no mistake.

As described above, according to the configuration of the present embodiment using the rectifying member 21, the efficiency improvement and noise reduction of the centrifugal fan 6 that are higher than those of the first embodiment can be realized.

10 to 12 are diagrams showing an internal configuration of the indoor unit according to the third embodiment. In the embodiment described above, the same shape of the rectifying plate 20 or the rectifying member 21 is provided at the two left and right sides of the side surface of the electrical component box 10, but in this embodiment, the rectifying plate 20 or the rectifying member 21 is singular or different. A plurality of shapes are used in combination. The description of the points common to the above-described embodiment is omitted.

FIG. 10 shows a state in which a rectifying member 21 is provided on the left side of the side surface of the electrical component box 10 and a rectifying plate 20 is provided on the right side. Further, in FIG. 11, the rectifying plate 20 is provided on the left side of the side surface of the electrical component box 10, and the rectifying plate 20 is not provided on the right side. Further, in FIG. 12, two rectifying plates 20 are provided on the left side of the side surface of the electrical component box 10, and two rectifying plates 20 are also provided on the right side. In FIG. 10, the positions of the rectifying plate 20 and the rectifying member 21 may be interchanged. In FIG. 11, the rectifying member 21 may be used instead of the rectifying plate 20, or the rectifying plate 20 or the rectifying member is only on the right side. 21 may be provided. Further, in FIG. 12, a rectifying member 21 may be used instead of the rectifying plate 20.

As described above, the same effects as those described in the first and second embodiments can be obtained by the structures shown in FIGS. 10 to 12 which are selected based on the structure of the indoor unit, the manufacturing method, the cost, and whether the thermistor is incorporated in the rectifying member. Can be obtained.

In FIG. 12, by attaching a plurality of rectifying plates in the longitudinal direction of the electrical component box 10, not only the airflow 51 from the longitudinal end of the electrical component box 10, but also the airflow closer to the center than the longitudinal end. 52 can also be guided to the center side of the bell mouth opening 91, so that the flow field at the bell mouth opening 91 can be made more efficient and uniform.

FIG. 13 is a diagram illustrating an internal configuration of the indoor unit according to the fourth embodiment. In the embodiment described above, the rectifying plate 20 or the rectifying member 21 that guides the left and right airflows 51 are separately provided. However, in this embodiment, both the left and right airflows 51 are rectified by one rectifying member 22. . The description of the points common to the above-described embodiment is omitted.

FIG. 13 is a plan view looking up at the BB cross section of FIG. 2, and shows only the bell mouth 9, the electrical component box 10, and the rectifying member 22 extracted. As shown here, in the present embodiment, a wide trapezoidal columnar rectifying member 22 having a slope that reaches the bell mouth opening 91 with the tip directed to the rotation axis Z is provided on the electrical component box 10. It is attached to the side. By the rectifying member 22, the airflow 51 flowing from both ends of the electrical component box 10 is guided toward the center of the bell mouth opening 91, thereby generating turbulence due to the separation of the airflow 51 from the electrical component box 10. And the generation | occurrence | production of the turbulent flow by the airflow 51 which flowed in from the right-and-left end part collides in the center part is prevented, and the airflow 51 is smoothly introduced to the centrifugal fan 6.

According to the rectifying member 22 described above, unlike the rectifying plate 20 of the first embodiment, the airflow 51 does not go around to the back side of the guide surface of the rectifying member 22, so that turbulence is generated on the back surface of the rectifying plate 20. There is nothing. Moreover, since the effect similar to having attached the two rectifying

plates

20 and 21 mentioned above can be acquired only by attaching one rectifying member 22, the working efficiency at the time of manufacture can be improved significantly.

In FIG. 13, the guide surface of the rectifying member 22 is configured by a single plane. However, the same effect can be obtained by configuring the guide surface by a curved surface or combining a plurality of planes. .

14 to 16 are diagrams showing an internal configuration of the indoor unit according to the fifth embodiment. In the embodiment described above, the guide surfaces of the rectifying plate 20, the rectifying member 21, and the rectifying member 22 are arranged in parallel with the rotation axis Z. However, in this embodiment, the guide surface of the rectifying plate 23 is inclined with respect to the rotation axis Z. Are arranged. The description of the points common to the above-described embodiment is omitted.

FIG. 14 is a plan view looking up at the BB cross section of FIG. 2, and shows only the bell mouth 9, the electrical component box 10, and the current plate 23 extracted. As shown here, in this embodiment, the rectifying plate 23 formed of a single flat surface extending in the bell mouth opening 91 with the tip directed to the rotation axis Z is formed on the side surface of the electrical component box 10. It is attached to the place.

15 is a view of the electrical component box 10 and the rectifying plate 23 as seen from the FF cross section shown in FIG. 14, and FIG. 16 shows the electrical component box 10 and the rectifying plate 23 of this embodiment below. It is the perspective view looked up from. As shown in these drawings, by attaching the rectifying plate 23 to be inclined with respect to the rotation axis Z, the airflow 51 is not only guided to the center side of the bell mouth opening 91 but also directed toward the centrifugal fan 6. Can be bent in the direction.

The airflow 51 flowing from both ends of the electrical component box 10 is guided toward the center of the bell mouth opening 91 and upward by the two rectifying plates 23, so that the airflow 51 is converted into the electrical component box 10. Generation of turbulent flow due to separation from the air and generation of turbulent flow due to collision of the airflow 51 flowing in from the left and right end portions at the center are prevented, and the airflow 51 is smoothly introduced to the centrifugal fan 6. In FIG. 14, a portion indicated by a broken line in the air flow 51 indicates that the portion located above the current plate 23 when looking up at the bell mouth 9 or the like.

Also in this embodiment, the shape of the rectifying plate 23 is not limited to that shown in FIGS. 14 to 16, and as described in the above-described embodiment, it is assumed that a curved surface or a combination of a plurality of planes is used. Also good.

FIG. 17 to FIG. 19 are diagrams showing the internal configuration of the indoor unit of the sixth embodiment. In the fifth embodiment, the rectifying plate 23 whose base side and tip side are parallel is inclined with respect to the rotation axis Z. However, in this embodiment, the rectifying plate 24 whose tip side is inclined with respect to the base side is provided as a base side. And the rotation axis Z are arranged in parallel. The description of the points common to the above-described embodiment is omitted.

FIG. 17 is a plan view looking up at the BB section of FIG. 2, and shows only the bell mouth 9, the electrical component box 10, and the current plate 24 extracted. As shown here, in this embodiment, the rectifying plate 24 constituted by one curved surface having a length extending into the bell mouth opening 91 with the tip directed to the rotation axis Z is formed on the two side surfaces of the electrical component box 10. It is attached to the place.

18 is a view of the electrical component box 10 and the rectifying plate 24 as seen from the GG cross section shown in FIG. 17, and FIG. 19 shows the electrical component box 10 and the rectifying plate 23 of the present embodiment below. It is the perspective view looked up from. As shown in these drawings, the rectifying plate 24 has a large angle formed between the lower end 24a and the side surface of the electrical component box 10, and a small angle formed between the upper end 24b and the side surface of the electrical component box 10. Are attached to the side surface of the electrical component box 10 so that the rotation axis Z is parallel. With such a configuration, the air flow 51 can be bent not only toward the center of the bell mouth opening 91 but also upwardly toward the centrifugal fan 6.

The airflow 51 flowing from both ends of the electrical component box 10 is guided toward the center of the bell mouth opening 91 and upward by the two rectifying plates 24, so that the airflow 51 is converted into the electrical component box 10. Generation of turbulent flow due to separation from the air and generation of turbulent flow due to collision of the airflow 51 flowing in from the left and right end portions at the center are prevented, and the airflow 51 is smoothly introduced to the centrifugal fan 6. In FIG. 17, a portion indicated by a broken line in the airflow 51 indicates that the airflow 51 is located above the current plate 24 when looking up at the bell mouth 9 or the like.

Also in the present embodiment, the shape of the rectifying plate 24 is not limited to that shown in FIGS. 17 to 19, and as described in the above-described embodiments, it is assumed that a curved surface or a combination of a plurality of planes is used. Also good.

1 housing,
2 Panel 3 Grill 4 Outlet 5 Louver 6 Centrifugal fan 7 Heat exchanger 8 Filter 9 Bell mouth 91 Bell mouth opening 10, 11

Electrical box

50, 51, 52

Airflow

20, 23, 24 Current plate 24a Upper end of current plate

24b Lower end

21 and 22 of current plate 40 Current member 40 Motor 41 Drain pan Z

Claims

A motor that generates rotational driving force;
A centrifugal fan attached to the motor and discharging the air sucked from below in the circumferential direction;
A bell mouth for smoothly introducing airflow into the centrifugal fan;
An electrical box attached upstream of the bellmouth;
A rectifying member that guides an airflow flowing from the longitudinal end toward the center along the side surface of the electrical box, toward the center of the bell mouth opening;
An indoor unit characterized by comprising:
The indoor unit according to claim 1,
The indoor unit is characterized in that the rectifying member is a rectifying plate attached to a side surface of the electrical component box on the opening side and having a guide surface with a tip directed to a rotating shaft of the centrifugal fan.
The indoor unit according to claim 1,
The indoor unit is characterized in that the rectifying member is a polygonal column that is attached to a side surface of the electrical component box on the opening side and has a guide surface with a tip directed to a rotating shaft of the centrifugal fan.
The indoor unit according to claim 2 or claim 3,
The indoor unit is characterized in that the rectifying member is provided singly or in plural on a side surface of the electrical component box.
The indoor unit according to claim 2 or claim 3,
The indoor unit is characterized in that the guide surface is configured by one plane, a plurality of planes, a curved surface, or a combination of a plane and a curved surface.
The indoor unit according to claim 2 or claim 3,
The indoor unit is characterized in that the rectifying member is attached in parallel to a rotating shaft of the centrifugal fan.
The indoor unit according to claim 2 or claim 3,
The indoor unit, wherein the rectifying member is attached to be inclined with respect to a rotation axis of the centrifugal fan.
An air conditioner characterized in that the indoor unit according to claim 2 or 3 and the outdoor unit are connected to each other.