JP6429887B2 - Indoor unit for air conditioner and air conditioner - Google Patents

Description

  The present invention relates to an indoor unit for an air conditioner equipped with, for example, a centrifugal fan.

  There have been the following techniques for controlling the flow of the blowout part of the fan (particularly, a technique for realizing low power consumption and low noise by uniformizing the wind speed). For example, in a centrifugal fan that has an impeller composed of a plurality of blower blades disposed between a main plate and a side plate and blows air in a direction orthogonal or substantially orthogonal to the rotation axis, the outer diameter of the side plate or main plate of the impeller is It is formed larger than the outer diameter of the blower blade of the impeller (for example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 02-166323 (page 4, FIG. 1)

  However, since the centrifugal fan such as Patent Document 1 has the outer diameter of the side plate or the main plate larger than the outer diameter of the blower blades of the impeller, the boundary layer between the side plate and the main plate becomes thick, and the substantial inter-blade flow path Becomes narrower. For this reason, there has been a problem that sufficient low power consumption and low noise cannot be realized.

  The present invention has been made to solve such a problem, and provides an indoor unit for an air conditioner that has low power consumption and low noise.

Air conditioner indoor unit according to the present invention, main plate fixed to the rotary shaft, and the main plate and the counter has a plurality of vanes that will be disposed between the shroud and the main plate and the shroud having a suction port gas flows An air conditioner indoor unit that includes a centrifugal fan and an opening portion surrounded by a shroud, a main plate, and a wing serves as a blowout port for gas to flow out, and an outer peripheral portion of the main plate is around a joint portion with the wing A first portion and a second portion between the blades, and an end portion of the outer peripheral portion is formed in an arc shape in a cut surface cut in an axial direction of the rotating shaft, and a shroud and a main plate at the end portion of the outer peripheral portion The opening height, which is the distance between the two , is enlarged , and the radius of curvature of the end arc of the first portion is larger than the radius of curvature of the end arc of the second portion.

  According to the indoor unit for an air conditioner of the present invention, by expanding the outlet in the height direction in the outer peripheral portion of the main plate, the indoor heat exchange of the gas flowing in from the inlet is higher than the height of the outlet. Can be sent evenly to the vessel. At this time, the flow of the gas flowing out from the centrifugal fan becomes easy to spread in the gas inflow direction, and spreads along the end most easily. For this reason, the inflow of the airflow to the heat exchanger can be effectively made uniform, and the indoor unit for the air conditioner can have low power consumption and low noise.

It is a perspective view of the centrifugal fan 1 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention. 1 is a top view of an air conditioner indoor unit 100 according to Embodiment 1 of the present invention. It is AA sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention. It is BB sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the flow of the gas inside the conventional indoor unit for air conditioning apparatuses. It is sectional drawing which shows the flow of the gas inside the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention. It is AA sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 2 of this invention. It is BB sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 2 of this invention. It is a perspective view of the centrifugal fan 1 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 3 of this invention. It is AA sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the flow of the gas inside the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 3 of this invention. It is a perspective view of the centrifugal fan 1 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 4 of this invention. It is AA sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 5 of this invention. It is AA sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 6 of this invention. It is a figure showing the structural example of the air conditioning apparatus which concerns on Embodiment 7 of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Here, as for the reference numerals, those given the same reference numerals in FIGS. 1 to 14 are the same or equivalent, and this is common throughout the entire specification. And the form of the component represented by the whole specification is an illustration to the last, Comprising: It does not limit to the form described in the specification. In particular, the combination of the components is not limited to the combination in each embodiment, and the components described in the other embodiments can be applied to another embodiment. Moreover, the code | symbol regarding the wing | blade or winglet which has two or more sheets shall be attached | subjected only to one representative. In each embodiment, as an example, the case where the number of blades is seven is illustrated and described, but the effect of the present invention can be obtained even when the number of blades is other than seven. Furthermore, the upper side in the figure will be described as “upper side” and the lower side will be described as “lower side”. In the drawings, the relationship between the sizes of the constituent members may be different from the actual one.

Embodiment 1 FIG.
FIGS. 1-4 is a figure explaining the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention. Specifically, FIG. 1 is a perspective view of centrifugal fan 1 of air conditioner indoor unit 100 according to Embodiment 1 of the present invention. FIG. 2 is a top view of the air conditioner indoor unit 100 according to Embodiment 1 of the present invention. Furthermore, FIG. 3 is an AA cross-sectional view in FIG. 2 of the indoor unit 100 for an air-conditioning apparatus according to Embodiment 1 of the present invention. And FIG. 4 is BB sectional drawing in FIG. 2 of the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention.

  As shown in FIGS. 1-4, the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention has the centrifugal fan 1, the bellmouth 2, and the indoor heat exchanger 3. As shown in FIG. Here, the air conditioner indoor unit 100 in the present embodiment is a ceiling-embedded indoor unit. The centrifugal fan 1 includes a boss 12 that rotates around an axis 11, a main plate 13 that is connected to the boss 12, a shroud 14 that has a suction port 141 through which gas (for example, air) flows, a main plate 13, and a shroud 14. A plurality of (seven in the present embodiment) blades 15 are disposed between the blades 15. Further, in the centrifugal fan 1, a space between the blades 15 sandwiched between the main plate 13 and the shroud 14 becomes a blowout port 16. When a driving device (fan motor or the like) is attached to the boss 12 and the centrifugal fan 1 is rotated, gas flows in (inhales) through the bell mouth 2 from the suction port 141 facing the rotational axis direction (hereinafter referred to as the axial direction). ) The inflowing gas flows out (blows out) from the outlet 16 facing the outer peripheral direction intersecting the rotation axis.

  The bell mouth 2 is installed on the gas inflow side (suction side) of the centrifugal fan 1. The bell mouth 2 rectifies the gas and allows it to flow into the suction port 141 of the centrifugal fan 1. Moreover, the indoor heat exchanger 3 is installed so that the blower outlet 16 of the centrifugal fan 1 may be enclosed. The indoor heat exchanger 3 exchanges heat between the refrigerant and the gas flowing in the heat exchanger, and cools, heats, etc. the gas. Here, the height (length in the vertical direction) of the indoor heat exchanger 3 in the indoor unit 100 for an air conditioner according to the present embodiment is the height of the outlet 16 of the centrifugal fan 1 in relation to the amount of heat exchange and the like. It is configured to be higher than the length (the length between the main plate 13 and the shroud 14). The gas flowing out from the outlet 16 of the centrifugal fan 1 passes through the indoor heat exchanger 3 and flows out of the indoor unit 100 for the air conditioner.

  In the air conditioner indoor unit 100 of the present embodiment, the outer peripheral end 131 of the main plate 13 of the centrifugal fan 1 is in the axial main plate 13 side (the inflow direction of the gas flowing into the centrifugal fan 1. An enlarged portion 132 that extends in the axial direction main plate side and expands the size of the outlet 16 in the opening height direction is formed at the end of the outer peripheral portion. Here, the enlarged portion 132 is formed to have an arc shape (including a substantially arc shape, hereinafter referred to as a substantially arc shape) on the cut surface including the rotation axis. Further, as can be seen from the difference between the enlarged portion 132 in FIG. 3 and FIG. 4, the radius of curvature of the enlarged portion 132 is that of the wing portion 152 that is the first portion where the main plate 13 and the wing 15 are joined, It is formed so as to be larger than the blade interval 151 as the second portion.

  FIG. 5 is a cross-sectional view showing a gas flow inside a conventional indoor unit for an air conditioner. Moreover, FIG. 6 is sectional drawing which shows the flow of the gas inside the indoor unit 100 for air conditioning apparatuses which concerns on Embodiment 1 of this invention. Here, in order to clarify the correspondence, FIG. 5 is given the same reference numerals as those of the members in the indoor unit 100 for an air conditioner of the present embodiment. The effects obtained by the configuration of the air conditioner indoor unit 100 in the present embodiment will be described with reference to FIGS. 1, 5, and 6.

  As described above, in the air conditioner indoor unit 100, the gas flowing out from the outlet 16 of the centrifugal fan 1 flows into the indoor heat exchanger 3. At this time, since the height of the indoor heat exchanger 3 is different from the height of the outlet 16, as shown in FIG. 5, in the indoor unit 100 for a conventional air conditioner, the indoor heat exchanger 3 is connected to the indoor heat exchanger 3. Inflow becomes uneven. For example, when the air conditioner indoor unit 100 is installed, the amount of gas flowing into the region that becomes the top surface (the lower side in FIG. 5) decreases.

  On the other hand, as shown in FIG. 6, the indoor unit 100 for an air conditioner according to the present embodiment has a substantially arc shape so that the outlet 16 extends toward the axial main plate at the outer peripheral end 131 of the main plate 13. An enlarged portion 132 is provided. For this reason, the gas flowing out of the centrifugal fan 1 is likely to spread to the top surface side.

  Further, as shown in FIGS. 1 and 6, the flow of the gas flowing out from the centrifugal fan 1 has a large blowing flow velocity in the blade portion 152 that gives work to the airflow, and the space between the blades between the blade portion 152 and the blade portion 152 is increased. At 151, the blowout flow rate decreases. In view of this, the radius of curvature of the substantially arc-shaped enlarged portion 132 is formed large in the blade portion 152 having a large blowing flow velocity, and the curvature radius is formed small in the blade interval 151 having a small blowing flow velocity. Then, the gas is allowed to expand to the axial main plate side while following the substantially arc-shaped enlarged portion 132 of the outer peripheral end portion 131 of the main plate 13 without any difficulty. For this reason, the inflow of the gas to the indoor heat exchanger 3 can be made uniform effectively. Therefore, the air conditioner indoor unit 100 can be configured with low power consumption and low noise.

Embodiment 2. FIG.
In order to further reduce the power consumption and the noise of the air conditioner indoor unit 100, it is desirable that the air conditioner indoor unit 100 of the present embodiment has the following configuration. 7 and 8 are diagrams for explaining an air conditioner indoor unit 100 according to Embodiment 2 of the present invention. Specifically, FIG. 7 is an AA cross-sectional view in FIG. 2 of the indoor unit 100 for an air-conditioning apparatus according to Embodiment 2 of the present invention. FIG. 8 is a cross-sectional view taken along the line BB in FIG. 2 of the indoor unit 100 for an air-conditioning apparatus according to Embodiment 2 of the present invention.

  With respect to the configuration of the air conditioner indoor unit 100 according to Embodiment 2, the differences from Embodiment 1 will be described. In the air conditioner indoor unit 100 according to the present embodiment, the tangent at the outer peripheral end 131 of the substantially arc-shaped enlarged portion 132 toward the axial main plate of the outer peripheral end 131 of the main plate 13 of the centrifugal fan 1 is the centrifugal fan. 1 is configured to pass through the lower end portion 31 of the indoor heat exchanger 3 at a position where the distance between the outer peripheral end portion 131 and the indoor heat exchanger 3 is closest.

  As described above, by configuring the air conditioner indoor unit 100 according to Embodiment 2, the outer peripheral end 131 of the main plate 13 spreads along the substantially arc-shaped enlarged portion 132 toward the axial main plate. The blowout flow from the centrifugal fan 1 flows into the indoor heat exchanger 3 without excess or deficiency in order to expand at an optimal expansion angle. Therefore, the inflow of the airflow into the indoor heat exchanger 3 can be made even more effectively, and the air conditioner indoor unit 100 can be reduced in power consumption and noise.

Embodiment 3 FIG.
In order to further reduce the power consumption and the noise of the air conditioner indoor unit 100, it is desirable that the air conditioner indoor unit 100 of the present embodiment has the following configuration. 9 and 10 are diagrams for explaining an air conditioner indoor unit 100 according to Embodiment 3 of the present invention. Specifically, FIG. 9 is a perspective view of centrifugal fan 1 of air conditioner indoor unit 100 according to Embodiment 3 of the present invention. FIG. 10 is a cross-sectional view taken along the line AA in FIG. 2 of the indoor unit 100 for an air-conditioning apparatus according to Embodiment 3 of the present invention.

  With respect to the configuration of the air conditioner indoor unit 100 according to Embodiment 3 of the present invention, differences from Embodiment 1 and Embodiment 2 will be described. As shown in FIGS. 9 and 10, the air conditioner indoor unit 100 according to the present embodiment has a small blade 17 attached to the upstream side surface of the shroud 14 of the centrifugal fan 1.

  FIG. 11 is a cross-sectional view showing the flow of gas inside the air conditioner indoor unit 100 according to Embodiment 3 of the present invention. The effect obtained by configuring the indoor unit 100 for an air conditioner according to Embodiment 3 will be described with reference to FIG.

  As shown in FIGS. 9 to 11, by attaching a small wing 17 on the upstream side surface of the shroud 14 of the centrifugal fan 1, a space formed between the shroud 14, the bell mouth 2, and the indoor heat exchanger 3 is provided. The generated shroud vicinity vortex 4 can be strengthened. For this reason, the gas flowing out from the centrifugal fan 1 easily spreads to the bell mouth 2 side (axial bell mouth side) in the axial direction due to the airflow attraction effect by the action of the strong shroud vicinity vortex 4. Therefore, the inflow of the airflow into the indoor heat exchanger 3 can be made even more effectively, and the indoor unit 100 for the air conditioner can be reduced in power consumption and noise.

Embodiment 4 FIG.
In order to realize further reduction in power consumption and noise in the indoor unit 100 for an air conditioner, it is desirable to adopt the following configuration. FIG. 12 is a perspective view of centrifugal fan 1 of air conditioner indoor unit 100 according to Embodiment 4 of the present invention.

  With respect to the configuration of the air conditioner indoor unit 100 according to Embodiment 4 of the present invention, differences from Embodiments 1 to 3 will be described. Although not specifically defined in the third embodiment, in the indoor unit 100 for an air conditioner, the small blade 17 attached to the upstream side surface of the shroud 14 of the centrifugal fan 1 is disposed between the main plate 13 and the shroud 14. It is the same number as the plurality of blades 15 to be formed. Each winglet 17 is attached at a position that is the same as the wing 15 when viewed from the axial direction.

  The effect obtained by the above configuration will be described. The flow rate of the gas flowing out of the centrifugal fan 1 increases in the blowing flow velocity at the blade portion 152 that imparts work to the air flow, and decreases in the blade interval 151 between the blade portions 152 and 152. In addition, a strong shroud vicinity vortex 4 is generated in the small wing portion 172 which is a space near the small blade 17 provided on the upstream surface side of the shroud 14. On the other hand, a weak shroud vicinity vortex 4 is generated in the small blade inter-blade portion 171 which is a space between the small blade 17 and the small blade 17.

  As in the present embodiment, a small blade is provided on the upstream side surface of the shroud 14 of the centrifugal fan 1 so that the same number and the same number of blades 15 are disposed between the main plate 13 and the shroud 14. By attaching 17, a relatively strong shroud vicinity vortex 4 is generated in the wing portion 152 having a large blowing flow velocity, and the blowing flow having a large flow velocity is expanded toward the axial shroud side by an attraction effect. Further, a relatively weak shroud vicinity vortex 4 is generated between the blades 151 having a small blowing flow velocity so that the blowing flow having a small flow velocity is expanded toward the axial shroud side by an attraction effect. For this reason, the attractive effect of the intensity suitable for the magnitude | size of blowing flow velocity can be exhibited. Therefore, the inflow of the airflow into the indoor heat exchanger 3 can be made even more effective, and the air conditioner indoor unit 100 can be reduced in power consumption and noise.

Embodiment 5. FIG.
In order to realize further reduction in power consumption and noise in the indoor unit 100 for an air conditioner, it is desirable to adopt the following configuration. FIG. 13 is a cross-sectional view taken along line AA in FIG. 2 of the indoor unit 100 for an air-conditioning apparatus according to Embodiment 5 of the present invention.

  With respect to the configuration of the air conditioner indoor unit 100 according to Embodiment 5 of the present invention, portions different from those in Embodiments 1 to 4 will be described. As shown in FIG. 13, for the small blade 17 attached to the upstream side surface of the shroud 14 of the centrifugal fan 1, the axial height from the shroud outer peripheral end portion 142 to the small blade outer peripheral upper end portion 173 is h, and the shroud outer periphery The axial height from the end 142 to the bell mouth 2 is H. At this time, in the present embodiment, h is configured to be 1/2 or less of H.

  With the configuration as described above, in the indoor unit 100 for an air conditioner according to Embodiment 5, the size of the shroud vicinity vortex 4 generated by the small blades 17 is not excessive and interferes with the bell mouth 2. do not do. For this reason, the flow of the gas flowing out from the centrifugal fan 1 can be effectively expanded to the axial shroud side by the attraction effect while suppressing the flow loss to the minimum. Therefore, the inflow of the airflow to the indoor heat exchanger 3 can be made uniform, and the air conditioner indoor unit 100 can have low power consumption and low noise.

Embodiment 6 FIG.
In order to realize further reduction in power consumption and noise in the indoor unit 100 for an air conditioner, it is desirable to adopt the following configuration. 14 is a cross-sectional view taken along line AA in FIG. 2 of the indoor unit 100 for an air-conditioning apparatus according to Embodiment 6 of the present invention.

  With respect to the configuration of the air conditioner indoor unit 100 according to Embodiment 6 of the present invention, portions different from those in Embodiments 1 to 5 will be described. As shown in FIG. 14, let L be a radial distance at a position where the blowout port 16 in the outer peripheral end 131 of the centrifugal fan 1 and the indoor heat exchanger 3 are closest to each other. Further, the axial distance between the shroud outer peripheral end 142 of the centrifugal fan 1 and the upper end 32 of the heat exchanger, and the axial distance between the outer peripheral end 131 of the main plate 13 of the centrifugal fan 1 and the lower end 31 of the heat exchanger. Among these, let L1 be the smaller one and L2 the larger one. At this time, the air conditioner indoor unit 100 of the present embodiment is configured to satisfy L1 <L <L2. Here, in FIG. 14, the axial distance between the outer peripheral end 131 of the main plate 13 of the centrifugal fan 1 and the lower end 31 of the heat exchanger is L1, the shroud outer end 142 of the centrifugal fan 1 and the upper end of the heat exchanger. Although the case where the axial direction distance to 32 is set to L2 is shown as an example, it is not limited to this.

  With the above configuration, in the air conditioner indoor unit 100 according to Embodiment 6, the distance between the air outlet 16 at the outer peripheral end 131 of the centrifugal fan 1 and the indoor heat exchanger 3 is appropriately set. Can be maintained. The outer peripheral end 131 of the main plate 13 is formed with a substantially arc-shaped enlarged portion 132 toward the axial main plate, and the radius of curvature of the substantially arc-shaped enlarged portion 132 is large in the blade portion 152 where the blowing flow velocity is large. The flow between the blades 151 having a small flow velocity is small, and the blowout flow of the centrifugal fan 1 spread by attaching the small blades 17 to the upstream side of the shroud 14 of the centrifugal fan 1 is the most effective in the indoor heat exchanger 3. The air conditioner indoor unit 100 can be reduced in power consumption and noise.

Embodiment 7 FIG.
FIG. 15 is a diagram illustrating a configuration example of an air-conditioning apparatus according to Embodiment 7 of the present invention. The air conditioner of FIG. 15 connects an outdoor unit (outdoor unit) 200 and an indoor unit (indoor unit) 100 with a gas refrigerant pipe 300 and a liquid refrigerant pipe 400. The outdoor unit 200 includes a compressor 201, a four-way valve 202, an outdoor heat exchanger 203, an expansion valve 204, and an outdoor blower 205. The indoor unit 100 for an air conditioner has an indoor heat exchanger 3.

  The compressor 201 compresses and discharges the sucked refrigerant. Here, although not particularly limited, the capacity of the compressor 201 (the amount of refrigerant sent out per unit time) is changed by arbitrarily changing the operating frequency of the compressor 201 by, for example, an inverter circuit. You may be able to. The four-way valve 202 is, for example, a valve for switching the refrigerant flow between the cooling operation and the heating operation.

  The outdoor heat exchanger 203 performs heat exchange between the refrigerant and air (outdoor air). For example, it functions as an evaporator during heating operation, evaporating and evaporating the refrigerant. Moreover, it functions as a condenser during the cooling operation, and condenses and liquefies the refrigerant. The outdoor blower 205 sends gas to the outdoor heat exchanger 203. An expansion valve 204 such as a throttle device (flow rate control means) expands the refrigerant by depressurizing it. For example, in the case of an electronic expansion valve or the like, the opening degree is adjusted based on an instruction from a control means (not shown) or the like.

Further, as described above, the indoor heat exchanger 3 performs heat exchange between gas (for example, air to be air-conditioned) and refrigerant. During heating operation, it functions as a condenser and condenses and liquefies the refrigerant. Moreover, it functions as an evaporator during cooling operation, evaporating and evaporating the refrigerant.
As described above, the centrifugal fan 1 sends air to be air-conditioned, for example, into the indoor heat exchanger 3. The centrifugal fan 1 of the present embodiment has an enlarged portion 132 formed on the main plate 13.

  For this reason, according to the air conditioner of Embodiment 7, the air flow to the indoor heat exchanger 3 can be effectively achieved by using the indoor unit 100 for an air conditioner described in Embodiments 1 to 6. Can be made uniform, and the entire apparatus can achieve low power consumption and low noise.

  Although the air conditioner has been described in the seventh embodiment, the indoor units of the first to third embodiments can be used for other refrigeration cycle apparatuses such as a refrigeration apparatus.

  DESCRIPTION OF SYMBOLS 1 Centrifugal fan, 2 bell mouth, 3 indoor heat exchanger, 4 shroud vicinity vortex, 11 axial center, 12 boss | hub, 13 main plate, 14 shroud, 15 wing | blade, 16 outlet, 17 small wing | blade, 31 lower end part, 32 upper end part , 100 Air conditioner indoor unit, 131 Outer end, 132 Enlarged part, 141 Suction port, 142 Shroud outer end, 151 Between blades (second part), 152 Wing part (first part), 171 Small blade part , 172 Small blade part, 173 Small blade outer peripheral upper end part, 200 outdoor unit, 201 compressor, 202 four-way valve, 203 outdoor heat exchanger, 204 expansion valve, 205 outdoor blower, 300 gas refrigerant pipe, 400 liquid refrigerant pipe.

Claims (7)

A main plate fixed to the rotating shaft, a shroud facing the main plate and having a suction port through which gas flows, and a centrifugal fan having a plurality of blades disposed between the main plate and the shroud, the shroud, An opening part surrounded by a main plate and the wing is an indoor unit for an air conditioner that serves as a blowout port through which the gas flows out,
The outer peripheral portion of the main plate has a first portion that is the periphery of the joint portion with the wing, and a second portion that is between the wings,
An end portion of the outer peripheral portion is formed in an arc shape in a cut surface cut in the axial direction of the rotating shaft, and an opening height which is a distance between the shroud and the main plate at the end portion of the outer peripheral portion is enlarged. An air conditioner indoor unit having a larger radius of curvature of the arc of the end portion in the first portion than the radius of curvature of the arc of the end portion of the second portion. An indoor heat exchanger that is higher than the opening height and is installed so as to surround the outlet;
The said indoor heat exchanger is comprised so that the tangent of the position where the distance with the said indoor heat exchanger may approach in the circular arc of the said edge part in said 2nd part passes the lower end part of the said indoor heat exchanger. Item 2. An indoor unit for an air conditioner according to Item 1.   The indoor unit for an air conditioner according to claim 1 or 2, wherein the centrifugal fan has a small blade on an upstream side surface of the shroud.   4. The air conditioner chamber according to claim 3, wherein the number of the small blades is the same as the number of the blades, and is attached to a position that is the same as the blades when viewed from the rotation axis direction. Machine.   The height of the winglet is ½ or less of the distance in the direction of the rotation axis between the end of the outer peripheral portion of the shroud and the bell mouth installed on the gas inflow side of the centrifugal fan. The indoor unit for an air conditioning apparatus according to claim 4. The radial distance at the position where the end of the outer peripheral portion of the centrifugal fan and the indoor heat exchanger are close to each other is L. The end of the outer peripheral portion of the shroud of the centrifugal fan and the upper end of the indoor heat exchanger L1 is the shorter distance and the longer distance is the axial distance between the end of the outer peripheral portion of the main plate of the centrifugal fan and the lower end of the indoor heat exchanger. The air according to any one of claims 2 and 3, and a subordinate of claim 2 , wherein L1 is a configuration having a relationship of L1 <L <L2. Indoor unit for harmony equipment.   An air conditioner comprising the indoor unit for an air conditioner according to any one of claims 1 to 6 and an outdoor unit to perform air conditioning.

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