JP2007010259A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out reduction of a stalling area and suppression of peeling in a wall surface neighborhood of each member composing a cross flow fan without imparting a factor to be a load in a flow area of the cross flow fan in an air conditioner. <P>SOLUTION: The air conditioner is provided with an indoor unit 20 having: a heat exchanger 7 carrying out heat exchange with sent in air; and the cross flow fan 8 sending air to the heat exchanger 7. The cross flow fan 8 is composed of: a plurality of blades 8b at predetermined intervals in a circumferential direction; and a partition plate 8c partitioning the blade 8b in its axial direction. A circumferentially extending recessed part 6a for peeling suppression is provided in a portion positioned between each blade 8b in a side face of the partition plate 8c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner that uses a cross-flow fan as a blower in an indoor unit.

  As a cross flow fan (cross-flow fan) used in a conventional air conditioner, there is one disclosed in Japanese Patent Laid-Open No. 9-119393 (Patent Document 1). This crossflow fan supports a plurality of blades arranged radially at a predetermined interval in the circumferential direction with end plates and a partition plate arranged at a predetermined interval in the axial direction, A groove extending radially in the radial direction is formed, and this groove is intended to suppress separation of the boundary layer by feeding and rectifying air in the vicinity of the side surface.

  Moreover, there exists a thing shown by Unexamined-Japanese-Patent No. 2003-28089 (patent document 2) as a cross-flow fan of the conventional air conditioner. In this once-through fan, as the thickness distribution of the blade of the once-through fan is increased or decreased gradually from the outer peripheral edge toward the inner peripheral direction, a step is provided in the middle to increase the thickness rapidly. By setting the place to do, peeling is suppressed and the static pressure is increased.

JP-A-9-119393 JP 2003-028089 A

  However, in the crossflow fan disclosed in Patent Document 1, the radially extending groove formed on the side surface of the partition plate is a groove extending along the blowing direction, and thus has a sufficient peeling suppression effect. It was difficult.

  Further, in the once-through fan of Patent Document 2, since a step provided in the middle of the blade protrudes into the flow field, the disadvantage is that the flow is blocked on the upstream side of the once-through fan (the flow from the outer diameter side to the inner diameter side of the blade). It was a simple structure.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner that can reduce the stall area near the wall surface of each member constituting the cross-flow fan and suppress separation without giving a load factor to the flow field of the cross-flow fan. The purpose is to provide.

  According to a first aspect of the present invention for achieving the above object, an indoor unit includes a heat exchanger that exchanges heat with air to be blown, and a cross-flow fan that blows air to the heat exchanger. The fan is an air conditioner configured to include a plurality of blades arranged at predetermined intervals in the circumferential direction, and a partition plate that partitions the blades in the axial direction. A concave portion extending in the circumferential direction is provided in a portion located between the blades on the side surface.

  Moreover, the 2nd aspect of this invention equips an indoor unit with the heat exchanger which heat-exchanges with the air blown, and the once-through fan which ventilates the said heat exchanger, and the said once-through fan is predetermined in the circumferential direction. In the air conditioner configured to include a plurality of blades arranged at intervals, a concave portion or a convex portion extending in the axial direction is provided at the inner diameter side tip portion of the blade.

  According to a third aspect of the present invention, the indoor unit includes a heat exchanger that exchanges heat with the air to be blown, and a cross-flow fan that blows air to the heat exchanger, and the cross-flow fan is predetermined in the circumferential direction. In the air conditioner configured to include a plurality of blades arranged with an interval of, a concave portion or a convex portion extending in the axial direction is provided at the outer diameter side tip portion of the blade.

  According to a fourth aspect of the present invention, the indoor unit includes a heat exchanger that exchanges heat with the blown air, and a cross-flow fan that blows air to the heat exchanger, and the cross-flow fan is predetermined in the circumferential direction. In the air conditioner configured to include a plurality of blades arranged with an interval of, a recess extending in the axial direction is provided on the blade surface.

  A more preferable specific configuration in each aspect of the present invention is that the concave portions or the convex portions are provided in a plurality of strips in the blowing direction.

  ADVANTAGE OF THE INVENTION According to this invention, the air conditioner which can aim at reduction of the stall area | region near the wall surface of each member which comprises a crossflow fan, and suppression of peeling, without giving the factor which becomes a load to the flow field of a crossflow fan. Can be provided.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. Each embodiment of the present invention is applied as an example of an air conditioner to a separate type air conditioner in which an indoor unit includes a heat exchanger that performs heat exchange and a cross-flow fan that performs ventilation. The same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. In addition, it can be made more effective by combining each embodiment suitably as needed.
(First embodiment)
Initially, the air conditioner of 1st Embodiment of this invention is demonstrated using FIGS. 1-9.

  FIG. 1 is a schematic structural view showing the indoor unit of the air conditioner according to the first embodiment of the present invention from the front, and FIG. 2 is a schematic structural view showing the side of the indoor unit in FIG.

  A front panel 1 is installed on the front side of the indoor unit 20, and an upper grill 2 is installed on the upper surface side. The upper part of the front panel 1 is attached to the unit frame 3, and the front panel 1 can be opened and closed from the lower part with the upper part as a fulcrum. In addition, during the operation of the air conditioner, the upper portion of the front panel 1 is opened around the middle abdomen. The front panel 1 can be removed from the unit frame 3 at the top, and is removable from the unit frame 3. The top grill 2 is also attached to the unit frame 3 and is detachable. A transverse wind direction plate 11 is installed on the lower surface side of the indoor unit 20, and the transverse wind direction plate 11 is attached to the casing 9. The air outlet 18 of the indoor unit 20 can be opened and closed as the side wind direction plate 11 rotates. The appearance of the indoor unit 20 is substantially constituted by the front panel 1, the upper grill 2, the unit frame 3, the cross wind direction plate 11, the casing 9, and the like.

  A pre-filter 4 is installed immediately inside the front panel 1 and the top grill 2 of the indoor unit. The prefilter 4 is attached to the unit frame 3 and can be detached from the unit frame 3 by sliding. An air purification filter 5 is installed inside the prefilter 4 and is located on the front side of the indoor unit. The air purification filter 5 is also attached to the unit frame 3 so that it can be attached and detached. A heat exchanger 7 is installed further inside the indoor unit 20 and is composed of pipes and fins. The heat exchanger 7 exchanges heat with the air to be blown, and is arranged so as to surround the cross-flow fan 8, and is divided into three places, one on the indoor unit upper side and two on the front side. It has been. The cross-flow fan 8 blows air to the heat exchanger, and is arranged so as to be sandwiched between the casings 9. The end of the rotating shaft of the once-through fan 8 is connected to a motor. The vertical wind direction plate 10 is attached to the casing 9, and rotates with the attachment portion as a fulcrum. The copper pipe 16 for refrigerant is covered with a heat insulating material, and is piped on the back side of the indoor unit near the casing 9. The air supply / exhaust duct 14 is disposed at the lower part on the back side of the front panel 1 so that the air outlet 18 can be seen from the front when the front panel 1 is covered with the indoor unit 20.

  FIG. 3 is a perspective view of the cross-flow fan 8 provided in the indoor unit 20 of the air conditioner, and FIG. 4 shows a cross-flow fan block 8 a constituting the cross-flow fan 8.

  The cross-flow fan 8 provided in the indoor unit 20 of the air conditioner is formed by connecting a plurality of cross-flow fan blocks 8a in the axial direction in terms of strength and manufacturing because the fan width is larger than the fan diameter. . In this way, the cross-flow fan 8 is divided into several pieces in the axial direction, and a plurality of partition plates 8c are arranged. Cross-flow fan 8 has a structure in which an end plate to which a bearing is attached and an end plate to which a boss connected to a motor is attached are installed at both ends. One cross-flow fan block 8a is composed of a plurality of blades 8b radially arranged at a predetermined interval in the circumferential direction and a partition plate 8c to which the blades 8b are attached. In the partition plate 8c, the side surface opposite to the side surface on which the blades 8b are attached is matched to the blade shape so that the blades 8b of the other once-through fan blocks 8a can be fitted when the other once-through fan block 8a is connected. A plurality of fitting grooves 8d are provided.

  FIG. 5 shows a cross-sectional view of the partition plate 8c that partitions the cross-flow fan 8 into several when viewed from the circumferential direction of the cross-flow fan 8, and is a cross-section in a region A of FIG. FIG. 6 is a diagram showing a modification of FIG. FIG. 7 is a schematic view of the cross-flow fan block 8 a as viewed from the axial direction of the cross-flow fan 8. 8 and 9 are diagrams showing a modification of FIG.

  As shown in FIGS. 5 and 7, the wall surfaces on both sides of the partition plate 8 c are provided with recesses 6 a for suppressing peeling that extend in the circumferential direction. The recess 6a is provided at least in the vicinity of the peripheral edge located between the blades 8b on the side surface of the partition plate 8c, and in this embodiment, the radial direction of the recess 6a in the vicinity of the peripheral edge (in other words, air flow In the direction). Moreover, in this embodiment, it is provided also in the part located inside each blade | wing 8b in the side surface of the partition plate 8c. Although the cross section of the recessed part 6a shown in FIG. 5 is substantially the same in the ventilation direction, you may make it differ in a ventilation direction like the recessed part 6a shown in FIG. Moreover, although the shape of the recessed part 6a shown in FIG. 7 is a circular shape concentric with the partition plate 8c or the blade | wing 8b, as shown in FIG.8 and FIG.9, it is good also as a spiral shape or an intermittent shape. In the case of FIG. 9, since the shape extends so as to be substantially orthogonal to the blowing direction between the blades, the peeling prevention effect of the recesses 6 a works equally in the blowing direction, so a stable peeling suppression effect is obtained. There are advantages to being Further, as shown in FIG. 18, the shape of the recess 6a is such that an angle θ formed by a tangent at an arbitrary position and a tangent at the cross section of the blade closest to the position is 45 ° or more. In this relationship, there is a portion that satisfies the condition in any shape of the recess 6a.

  The function and operation of the indoor unit 20 of the air conditioner configured as described above will be described mainly assuming a state in which cooling / heating operation is performed.

  The air conditioner starts operation by receiving an operation signal from the remote controller in the electrical component of the electrical component unit located in the back of the display unit of the front panel 1. The lightning color of the electrical component changes in accordance with the operation mode, and the operation mode can be determined by confirming the color from the display unit of the front panel 1. When the operation is started, the front panel 1 is tilted forward with the middle portion as a fulcrum, and the upper part of the indoor unit is opened. The side wind direction plate 11 is rotated by control from the electric component unit, and opens the outlet of the indoor unit 20 that has been covered. Further, by operating the remote controller, the horizontal wind direction plate 11 and the vertical wind direction plate 10 are controlled via the electric component unit, and the wind direction of the indoor unit 20 can be changed. When the indoor unit 20 receives the operation signal, the outdoor unit also operates. The refrigerant sent from the outdoor unit circulates through the heat exchanger 7 via the refrigerant copper pipe 16.

  The motor connecting the cross-flow fan 8 is rotated in accordance with the operating state under the control of the electric component unit. The cross-flow fan 8 rotates clockwise in FIG. 2, and when the cross-flow fan 8 starts to rotate, the air is mainly sucked from the opening of the front panel 1 and the top grill 2 and passes through the prefilter 4 to the room. It flows into the inside of the unit 20. When this air passes through the pre-filter 4, dust and the like are removed. The air purification filter 5 installed further inside the pre-filter 4 cleans the air.

  Through the above process, the air flows into the heat exchanger 7 and exchanges heat, and then flows to the cross-flow fan 8 side. The heat-exchanged air is diverted by the partition plate 8c that divides the cross-flow fan 8 into several parts in the axial direction, and is sucked into the cross-flow fan 8. The air passes between the blades 8b and flows from the outer diameter side to the inner diameter side. The air that has flowed into the cross-flow fan 8 passes again between the blades 8b, moves from the inner diameter side to the outer diameter side, and flows out to the casing 9 side. The air that has been divided by the partition plate 8c joins again when it is blown out to the casing 9 side. The air direction is controlled by the horizontal wind direction plate 11 and the vertical wind direction plate 10 provided on the downstream side of the casing 9 and is blown out from the air outlet 18 of the indoor unit 20.

  Further, the indoor unit 20 has an air supply / exhaust function, and can select air supply from the outside to the room, air discharge from the room to the outside, and air circulation in the room. When these air supply / exhaust functions are used, airflow is blown out from the air supply / exhaust duct 14 installed at the lower part of the front panel 1. The airflow from the air supply / exhaust duct 14 also serves to control the airflow of the air blown from the casing 9.

  The function and effect of the air conditioner of the first embodiment will be described below.

  In the operating state, the air flowing into the once-through fan 8 is divided by the partition plate 8c, and the flow in the vicinity of the partition plate 8c is stalled and blown out to the casing 9 side. Therefore, in order to suppress the stall in the vicinity of the partition plate 8c, a recess 6a is provided on the wall surface of the partition plate 8c. In the vicinity of the wall surface, there exists a boundary layer whose speed is greatly changed, and when the boundary layer peels off from the wall surface, the flow of fluid becomes extremely worse on the downstream side of the wall surface where the separation occurs. On the other hand, the effect of suppressing peeling can be produced by including disturbance in the boundary layer. Therefore, peeling of the boundary layer can be suppressed by giving fine disturbance in the boundary layer by the recess 6a of the wall surface. Further, as shown in FIG. 18, the shape of the recess 6a includes a portion where the angle θ between the tangent at an arbitrary position and the tangent at the cross section of the blade closest to the position is 45 ° or more. . By doing so, it becomes the positional relationship which the recessed part 6a fully opposes with respect to a ventilation direction, and can generate a fine disorder effectively. As an example of the undulation shape, the undulation portion 6a of FIG. 5 and the undulation portion 6b of FIG. 6 are shown. However, it is important that there are a plurality of undulations, and the positions of the undulations are aligned on the respective wall surfaces. It is not necessary and may be other than the undulating shape in the figure. The same applies to the position of the undulating portion 6, and it is important that there are a plurality of undulations, and arrangement / division methods other than those shown in FIGS.

By adopting the above structure, the air conditioner having a high performance air blowing function capable of achieving both improvement of the flow in the vicinity of the wall surface of the partition plate 8c and low load on the flow field, and suppressing the deterioration of the flow in the vicinity of the wall surface itself Machine can be realized.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in the points described below, and the other points are basically the same as those in the first embodiment, and thus redundant description is omitted.

  FIG. 11 shows a cross-sectional view of the blade 8b constituting the cross-flow fan 8 when viewed from the axial direction of the cross-flow fan 8, and is a cross section in a region B of FIG. 12 and 13 are enlarged views of the tip on the inner diameter side of the blade 8b, and show an enlarged region C in FIG.

  In the second embodiment, as shown in FIG. 12A, the inner diameter side tip portion of the blade 8b is provided with a recess 13a for suppressing peeling that extends in the axial direction. Further, as shown in FIG. 12B, instead of the recess 13a, a protrusion 13b for suppressing separation extending in the axial direction may be provided at the inner diameter side tip of the blade 8b. Alternatively, as shown in FIG. 13 (a), a plurality of strip-reducing depressions 13a extending in the axial direction may be provided in the ventilation direction at the tip on the inner diameter side of the blade 8b. Alternatively, as shown in FIG. As shown in FIG. 6, a plurality of strips 13b for preventing separation extending in the axial direction may be provided in the air flow direction at the tip on the inner diameter side of the blade 8b.

  The air that has flowed into the heat exchanger 7 and exchanged heat flows to the cross-flow fan 8, is divided by the partition plate 8 c that divides the cross-flow fan 8 in the axial direction, and is sucked into the cross-flow fan 8. This air passes between the blades 8b and flows from the outer diameter side to the inner diameter side. The air that has flowed into the cross-flow fan 8 passes between the blades 8b, moves from the inner diameter side to the outer diameter side, and flows out to the casing 9 side.

  As shown in FIG. 10, in the operation state in which the once-through fan 8 rotates and blows air, the flow in the vicinity of the blade surface of the blade 8b constantly changes. In the circulating vortex 12 which is a region where the suction and blowing of the once-through fan 8 are reversed, the flow field changes particularly severely. When the cross-flow fan 8 is rotating, the flow field at the inner diameter side tip of the blade 8b is also constantly changing, so that a stall region and separation due to the inner diameter side tip occur.

If separation occurs at the inner diameter side tip, it affects the range of the main flow between the blades, resulting in a region where the flow deteriorates between the blades. In the vicinity of the wall surface, there exists a boundary layer whose speed is greatly changed, and when the boundary layer peels off from the wall surface, the flow of fluid becomes extremely worse on the downstream side of the wall surface where the separation occurs. On the other hand, the effect of suppressing peeling can be produced by including disturbance in the boundary layer. Therefore, in order to improve the flow in the vicinity of the inner diameter side distal end portion, the above-described concave portion 13a or convex portion 13b is provided, and the separation of the boundary layer can be suppressed by generating fine disturbance in the boundary layer. Further, even if the blade tip has an uneven shape, the shape itself does not directly interfere with the main flow of the cross-flow fan 8, so that both low load and improvement of the flow field can be achieved. Therefore, it is possible to realize an air conditioner having a high-performance air blowing function that can suppress the deterioration of the flow in the vicinity of the wall surface.
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. 10, 11, 14, and 15. FIG. The third embodiment is different from the second embodiment in the following points, and the other points are basically the same as those in the second embodiment, and thus redundant description is omitted.

  14 and 15 are enlarged views of the outer diameter side tip portion of the blade 8b, and an area D of FIG. 11 is enlarged. In this embodiment, as shown in FIG. 14 (a), the outer diameter side tip of the blade 8b is provided with a recess 15a for preventing peeling extending in the axial direction. Further, as shown in FIG. 14B, instead of the recess 15a, an exfoliation-suppressing projection 15b extending in the axial direction may be provided at the outer diameter side tip of the blade 8b. Alternatively, as shown in FIG. 15 (a), a plurality of strip-reducing depressions 15a extending in the axial direction may be provided in the ventilation direction at the outer diameter side tip of the blade 8b, or alternatively, as shown in FIG. ), A plurality of strip-suppressing convex portions 15b extending in the axial direction may be provided in the ventilation direction at the tip end portion on the outer diameter side of the blade 8b.

  As shown in FIG. 10, in the operation state in which the once-through fan 8 rotates and blows air, the flow in the vicinity of the blade surface of the blade 8b constantly changes. In the circulating vortex 12 which is a region where the suction and blowing of the once-through fan 8 are reversed, the flow field changes particularly severely. When the cross-flow fan 8 is rotating, the flow field at the tip of the outer diameter side blade of the blade 8b is also constantly changing, so that a stall region and separation due to the tip of the outer diameter side blade are generated.

If separation occurs at the outer diameter side tip, the main flow range between the blades is affected, and a region where the flow deteriorates between the blades is generated. In the vicinity of the wall surface, there exists a boundary layer whose speed is greatly changed, and when the boundary layer peels off from the wall surface, the flow of fluid becomes extremely worse on the downstream side of the wall surface where the separation occurs. On the other hand, the effect of suppressing peeling can be produced by including disturbance in the boundary layer. Therefore, in order to improve the flow in the vicinity of the outer diameter side blade tip, it is possible to suppress the separation of the boundary layer by providing the concave portion 15a or the convex portion 15b and generating a fine disturbance in the boundary layer. Further, even if the blade tip has an uneven shape, the shape itself does not directly interfere with the main flow of the cross-flow fan 8, so that both low load and improvement of the flow field can be achieved. Therefore, it is possible to realize an air conditioner having a high-performance air blowing function that can suppress the deterioration of the flow in the vicinity of the wall surface.
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. 10, FIG. 11, FIG. 16, and FIG. The fourth embodiment is different from the second embodiment or the third embodiment in the following points, and is basically the same as the second embodiment or the third embodiment in other points. Therefore, the overlapping description is omitted.

  16 and 17 are enlarged views of the outer diameter side blade tip of the blade 8b, and show the region E and the region F in FIG. 11 in an enlarged manner. In each figure, (a) is an enlarged view of the region E, and (b) is an enlarged view of the region F.

  In the fourth embodiment, as shown in FIG. 16 (a), an exfoliation depression 17 extending in the axial direction is provided on the outer diameter side of the blade surface of the blade 8b, and on the inner diameter side of the blade surface of the blade 8b. As shown in FIG. 16B, a recess 17 for suppressing peeling is provided extending in the axial direction. Alternatively, as shown in FIG. 17, a plurality of depressions 17 are provided on the blade surface of the blade 8b. Alternatively, a plurality of strips for preventing separation 17 extending in the axial direction in the axial direction as shown in FIG. 17A may be provided on the outer diameter side of the blade surface of the blade 8b, or the blade of the blade 8b. As shown in FIG. 17B, a plurality of strips 17 for preventing separation that extends in the axial direction may be provided in the ventilation direction on the inner diameter side of the surface.

  As shown in FIG. 10, in the operating state in which the once-through fan 8 rotates and blows air, the flow in the vicinity of the blade surface of the blade 8b constantly changes. In the circulation vortex 12 which is a region where the suction and blowing of the once-through fan are reversed, the flow field changes particularly severely. When the cross-flow fan 8 is rotating, the flow field between the blades of the blades 8b is also constantly changing, so that a stall region and separation due to the blades 8b occur.

  If separation occurs on the blade surface of the blade 8b, a region where the flow deteriorates is generated on the downstream side of the separation point. In the vicinity of the wall surface, there exists a boundary layer whose speed is greatly changed, and when the boundary layer peels off from the wall surface, the flow of fluid becomes extremely worse on the downstream side of the wall surface where the separation occurs. On the other hand, the effect of suppressing peeling can be produced by including disturbance in the boundary layer. Therefore, in order to improve the flow in the vicinity of the blade 8b, it is possible to suppress the separation of the boundary layer by providing the concave portion 17 on the blade surface of the blade 8b and generating a fine disturbance in the boundary layer. Moreover, since the cross section which becomes resistance from the reference | standard blade surface does not protrude into the flow field, the recessed part 17 does not obstruct the mainstream of the once-through fan 8 directly. For this reason, both low load and improved flow field are achieved.

  By setting it as the above structure, the air conditioner provided with the high performance air blower function which can suppress the deterioration of the flow of the wall vicinity vicinity itself can be implement | achieved.

It is a schematic structure figure showing the indoor unit of the air harmony machine of the 1st to 4th embodiment of the present invention from the front. It is a schematic structure figure shown from the side of the indoor unit of the 1st to 4th embodiment of the present invention. It is a perspective view of the crossflow fan of the 1st to 4th embodiment of the present invention. It is a perspective view of the cross-flow fan block of the 1st to 4th embodiment of the present invention. It is an expanded sectional view of the area | region A of FIG. 4 in 1st Embodiment of this invention. It is a figure which shows the modification of FIG. It is the schematic which looked at the cross-flow fan block in 1st Embodiment of this invention from the axial direction. It is a figure which shows the modification of FIG. It is a figure which shows another modification of FIG. It is a trajectory diagram of the once-through fan according to the second to fourth embodiments of the present invention. It is the cross-sectional schematic of the blade | wing of the once-through fan which concerns on 2nd-4th embodiment of this invention. It is the C section enlarged view of Drawing 11 in a 2nd embodiment. It is a figure which shows the modification of FIG. It is the D section enlarged view of Drawing 11 in a 3rd embodiment. It is a figure which shows the modification of FIG. It is the E section and F section enlarged view of Drawing 12 in a 4th embodiment. It is a figure which shows the modification of FIG. It is an enlarged view between the blade | wings of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Front panel, 2 ... Upper surface grille, 3 ... Unit frame, 4 ... Pre filter, 5 ... Emptying filter, 6a, 6b ... Recess, 7 ... Heat exchanger, 8 ... Cross-flow fan, 8a ... Cross-flow fan block, 8b ... Blades, 8c ... partition plate, 8d ... fitting groove, 9 ... casing, 10 ... longitudinal wind direction plate, 11 ... transverse wind direction plate, 12 ... circulating vortex, 13a ... concave portion, 13b ... convex portion, 14 ... air supply / exhaust duct, 15a ... concave portion, 15b ... convex portion, 16 ... copper pipe for refrigerant, 17 ... concave portion, 18 ... outlet, 20 ... indoor unit.

Claims (5)

The indoor unit includes a heat exchanger that exchanges heat with the air to be blown, and a cross-flow fan that blows air to the heat exchanger,
The cross-flow fan is an air conditioner configured to include a plurality of blades arranged at predetermined intervals in the circumferential direction, and a partition plate that partitions the blades in the axial direction.
The air conditioner characterized by providing the recessed part extended in the circumferential direction in the part located between each blade | wing in the side surface of the said partition plate. The indoor unit includes a heat exchanger that exchanges heat with the air to be blown, and a cross-flow fan that blows air to the heat exchanger,
In the air conditioner configured to include a plurality of blades arranged with a predetermined interval in the circumferential direction, the cross-flow fan,
An air conditioner characterized in that a concave portion or a convex portion extending in the axial direction is provided at an inner diameter side tip portion of the blade. The indoor unit includes a heat exchanger that exchanges heat with the air to be blown, and a cross-flow fan that blows air to the heat exchanger,
In the air conditioner configured to include a plurality of blades arranged with a predetermined interval in the circumferential direction, the cross-flow fan,
An air conditioner characterized in that a concave portion or a convex portion extending in the axial direction is provided at the outer diameter side tip portion of the blade. The indoor unit includes a heat exchanger that exchanges heat with the air to be blown, and a cross-flow fan that blows air to the heat exchanger,
In the air conditioner configured to include a plurality of blades arranged with a predetermined interval in the circumferential direction, the cross-flow fan,
An air conditioner comprising a recess extending in the axial direction on the blade surface. The air conditioner according to any one of claims 1 to 4, wherein the concave portion or the convex portion is provided so as to form a plurality of strips in a blowing direction.

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