JP4957774B2 - Cross flow fan and air conditioner equipped with the same - Google Patents

Description

  The present invention relates to a cross flow fan and an air conditioner equipped with the same.

  In general, it is known that a crossflow fan is used as a blower included in a wall-mounted air conditioner. As shown in FIG. 22, the crossflow fan 104 is a surface perpendicular to the central axis Z of the impeller 141. , The airflow X is a cross-flow blower (cross-flow blower) that passes through the impeller 141 so as to cross. That is, when the impeller 141 provided with the blades (blades) 142 rotates in the direction indicated by the arrow Z1 in the drawing, for example, air cooled or heated in the air conditioner (that is, conditioned air) enters the room. It is configured to be blown out.

  Further, in the impeller of the cross flow fan, noise is generated when air passes through the blades forming the impeller, so that the cross-sectional shape of the blade edge portion is sawtooth-shaped, There is known a cross flow fan in which a notch is formed at the edge of the fan.

  For example, for the purpose of reducing the above noise with a simple shape, an invention has been filed in which a plurality of notches are formed at predetermined intervals in the edge of a blade (see, for example, Patent Document 1). More specifically, as shown in FIGS. 23 and 24, the outer peripheral edge of the blade 242 is formed by forming a plurality of notches in the outer peripheral edge portion (the outer peripheral blade tip in Patent Document 1) 242 a of the blade 242. The part 242a is formed with a plurality of cut parts 242b that are cut from the outer peripheral side edge part 242a in a direction perpendicular to the direction (indicated by an arrow T in the figure) at a predetermined interval. The basic shape portion (smooth portion in Patent Document 1) 242c is left between the cut portions 242b. 25, the blade thickness L6 of the outer peripheral side edge portion 242a of the cut portion 242b is the same as the blade thickness L5 of the outer peripheral side edge portion 242a of the basic shape portion 242c, as shown in FIG. And as for the shape of the outer peripheral side edge part 242a of the blade | wing 242 in the notch part 242b, as shown in FIG.25 (b) and FIG. 26, the end surface 242y of the outer peripheral side edge part 242a is flat. As described above, since the blades 242 are formed with a plurality of cut portions 242b, the wake vortex (not shown) generated on the blowout side M of the crossflow fan 204 is reduced, and noise is effectively achieved with a simple shape. Can be reduced.

JP 2006-125390 A

  However, when a notch is formed in the edge of a blade as described in the above-mentioned patent document, noise can be effectively reduced with a simple shape, but there is a problem that the input of the electric motor increases. It was. Specifically, when a notch is formed in the outer peripheral edge 242a of the blade 242, as shown in FIG. 26, the air flow X collides with the flat end surface 242y of the outer peripheral edge 242a in the notch 242b. Thus, the impeller 241 rotates. For this reason, when the notch is formed in the outer peripheral side edge 242a, the air flow X is cut in the suction side N of the cross flow fan 204 as compared to the case where the outer peripheral side edge 242a is not formed. The collision loss increases by flowing into the portion 242b. As a result, for example, the input of the electric motor (not shown) for driving the cross flow fan 204 (that is, the power supplied to the electric motor) has increased.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a cross flow fan that suppresses an increase in input of an electric motor for driving the cross flow fan and an air conditioner including the cross flow fan. is there.

The invention according to claim 1 is the cross flow fan in which the impeller is formed by the blade curved to the pressure surface side, and at least one edge of both the inner circumferential side and the outer circumferential side of the blade, A plurality of cut portions cut at right angles from the edge portions are formed at predetermined intervals so as to leave a basic shape portion between the cut portions, and are recessed on one of the pressure surface and the suction surface of the blade. Is formed so that the blade thickness of the edge of the cut portion is smaller than the blade thickness of the edge of the basic shape portion provided adjacent to the cut portion, and the longitudinal section of the blade in, the other surface is not formed depressions straight der is, a boundary portion between adjacent said notch and the basic shape section with each other, characterized in that it extends parallel to the perpendicular direction .

  According to this configuration, at least one of the edges on the inner peripheral side and the outer peripheral side of the wing is provided with a notch cut in a direction perpendicular to the edge between the notches. Since a plurality of shapes are formed at predetermined intervals so as to leave the shape portion, noise can be effectively reduced with a simple shape. Furthermore, since the blade thickness at the edge of the cut portion is smaller than the blade thickness of the edge of the basic shape portion provided adjacent to the cut portion, the blade thickness at the edge of the cut portion. Is the same as the blade thickness of the edge of the basic shape portion provided adjacently, or larger than the blade thickness of the edge of the basic shape portion provided adjacently, The area of the end face of the edge can be reduced. Therefore, it is possible to reduce the collision loss when the air flow flows into the cut portion, and as a result, it is possible to suppress an increase in the input of the electric motor for driving the cross flow fan. In the above description, the “predetermined interval” may be a constant interval or may be an interval in which the interval is changed depending on the position of the blade in the longitudinal direction.

  The invention according to claim 2 is the crossflow fan according to claim 1, wherein the cut portion is one of the inner peripheral side and the outer peripheral side of the blade in the direction parallel to the chord. It is characterized in that the blade thickness is gradually increased from one cut edge to the other edge.

  According to this configuration, the incision portion moves in the direction parallel to the chord from one edge portion of the blade on the inner peripheral side and the outer peripheral side toward the other edge portion. The blade thickness is formed to gradually increase. For this reason, in the direction parallel to the chord, the blade thickness of the edge of the cut portion is smaller than the blade thickness of the edge of the basic shape portion provided adjacent to the cut portion. The pressure surface and the suction surface can be formed with a smooth curved surface. Therefore, the air flow can be prevented from being disturbed, and an increase in the input of the electric motor for driving the cross flow fan can be further suppressed.

  Invention of Claim 3 is the crossflow fan of Claim 1 or Claim 2, Comprising: A notch part is V shape seeing from the suction surface side and pressure surface side of a wing | blade, The cut portion is characterized in that the blade thickness is gradually increased from the cut portion toward the basic shape portion at the boundary between the cut portion and the basic shape portion in the longitudinal direction of the blade. To do.

  According to the same configuration, the notch formed at the blade edge is V-shaped when viewed from the suction surface side and the pressure surface side of the blade, so the notch formed at the blade edge is Compared with the rectangular shape, the pressure area of the blade can be secured. Further, the cut portion is formed so that the blade thickness gradually increases from the cut portion toward the basic shape portion at the boundary portion between the cut portion and the basic shape portion in the longitudinal direction of the blade. For this reason, in the longitudinal direction of the blade, the blade thickness at the edge of the cut portion is smaller than the blade thickness of the edge of the basic shape portion provided adjacent to the cut portion. The blade thickness can be continuously changed so that no step is formed at the boundary with the basic shape portion. Therefore, compared to the case where a step is formed at the boundary between the cut portion and the basic shape portion, the air flow can be prevented from being disturbed, and the input of the electric motor for driving the cross flow fan can be increased. Further suppression can be achieved.

  A fourth aspect of the present invention is the crossflow fan according to any one of the first to third aspects, wherein the blade surface in the cut portion has a basic pressure surface and a negative shape. Since the depression is formed on the pressure surface, the blade thickness of the edge portion of the cut portion is formed smaller than the blade thickness of the edge portion of the basic shape portion provided adjacently.

  According to this configuration, the blade shape in the cut portion is the basic shape in which the pressure surface remains the basic shape and the blade thickness at the edge of the cut portion is adjacent because the depression is formed in the suction surface. Therefore, the pressure applied to the air flow can be increased as compared with the case where the depression is formed on the pressure surface.

  Invention of Claim 5 is a crossflow fan as described in any one of Claim 1 thru | or 4, Comprising: On the negative pressure surface of a blade | wing, it suppresses that the gas which flows in a blade | wing peels. Therefore, a turbulent boundary layer control structure for transitioning the boundary layer from laminar flow to turbulent flow is provided.

  According to this configuration, a turbulent boundary layer control structure (for example, dimples, grooves, rough surfaces) that transitions the boundary layer from laminar flow to turbulent flow is provided on the negative pressure surface of the blade in order to suppress gas separation. Etc.), the boundary layer on the suction surface of the blade can be changed from laminar flow to turbulent flow. Therefore, the deceleration of the air flow in the boundary layer is reduced, and the flow of air flowing into the wing can be prevented from being separated from the wing. In particular, when the edge of the wing is cut and a notch is formed in the wing, a gas with a flow that has collapsed two-dimensionality (that is, a flow with three-dimensionality) flows into the wing. By providing a turbulent boundary layer control structure such as a dimple whose shape changes or an irregular rough surface, separation of the air flow flowing into the blade can be effectively suppressed. As a result, the pressure resistance acting on the blade can be reduced, and the input of the electric motor for driving the crossflow fan can be reduced as compared with the case where the turbulent boundary layer control structure is not provided.

The invention according to claim 6 is the crossflow fan according to claim 5, wherein the turbulent boundary layer control structure is provided in a basic shape portion formed between the cut portions. To do.
According to this configuration, since the turbulent boundary layer control structure is provided in the basic shape part formed between the cut portions, for example, when a dimple or a groove is provided as the turbulent boundary layer control structure in the cut portion. Compared to the above, dimples and grooves having a desired depth can be easily formed. That is, since the basic shape portion has a larger blade thickness than the cut portion, the depth of the dimples and grooves as the turbulent boundary layer control structure can be easily secured.

The invention according to claim 7 is the crossflow fan according to claim 5 or 6, wherein the turbulent boundary layer control structure is a dimple.
According to this configuration, since the turbulent boundary layer control structure for transitioning the boundary layer from laminar flow to turbulent flow is a dimple, the turbulent boundary layer control structure is a groove extending along the gas flow direction. Compared with a certain case, the effect of suppressing the separation of the gas flowing into the blade can be increased. That is, if the turbulent boundary layer control structure is a dimple, the boundary layer is changed from a laminar flow to a turbulent flow, and a secondary flow is generated in the dimple, thereby generating a shear force generated at the bottom of the boundary layer. Can be reduced. Therefore, it can suppress more that the flow of the air which flows in into a wing | blade separates from a wing | blade.

  The invention according to claim 8 is the crossflow fan according to claim 7, wherein the dimples are arranged in the vicinity of at least one edge of both the inner peripheral side and the outer peripheral side of the blade. A plurality of dimples are formed along the gas flow direction on the negative pressure surface, and the depths of the plurality of dimples become shallower from one edge to the other edge where these dimples are formed in the vicinity. To do.

  According to this configuration, the depth of the plurality of dimples formed in the vicinity of at least one of the inner and outer peripheral edges of the blade becomes shallower toward the other edge. Among the plurality of dimples, the dimple provided away from the edge has a smaller depth than the dimple provided near the edge. In this way, by making the depth of multiple dimples different, the effect of suppressing the development of the boundary layer is suppressed, and the loss due to the secondary air flow in the dimple provided away from the edge is suppressed. Can do. Therefore, the input of the electric motor for driving the crossflow fan can be reduced as compared with the case where the depths of the plurality of dimples are the same. The plurality of dimples that become shallower from one edge to the other edge may be several dimples constituting a plurality of dimples provided in the vicinity of the one edge. All of the dimples constituting a plurality of dimples provided in the vicinity of the edge portion may be used.

  Invention of Claim 9 is a crossflow fan as described in any one of Claim 1 thru | or 8, Comprising: A notch | incision part is out of both the edge parts of the inner peripheral side and outer peripheral side of a wing | blade. It is provided in the outer peripheral side edge part.

  According to this configuration, the cut portion is provided on the outer peripheral side edge portion of both the inner peripheral side and outer peripheral side edge portions of the blade. On the suction side of the cross flow fan, the air flow flows from the outer peripheral side of the blade to the notch so as to resist the rotation of the impeller, so when the notch is provided on the inner peripheral edge In comparison, it is possible to further reduce the collision loss when the air flow flows into the cut portion, and to further suppress the increase in the input of the electric motor for driving the cross flow fan.

  A tenth aspect of the present invention is the crossflow fan according to any one of the first to ninth aspects, wherein the cut portions are both the inner peripheral side and the outer peripheral side of the blade. It is provided in.

  According to this configuration, since the cut portions are provided on both the inner peripheral side and the outer peripheral side of the blade, noise can be further effectively reduced, and the cross flow fan suction side can be reduced. Thus, it is possible to reduce the collision loss when the air flow flows into the cut portion from the outer peripheral side of the blade. Furthermore, on the blowout side of the cross flow fan, it is possible to reduce the collision loss when the air flow flows into the cut portion from the inner peripheral side of the blade. Therefore, compared with the case where the cut portion is provided only on one of the outer peripheral side edge and the inner peripheral side edge, it is possible to reduce the collision loss while reducing the noise more effectively. An increase in input of the electric motor for driving the flow fan can be further suppressed.

The invention described in claim 11 is characterized by including the cross flow fan described in any one of claims 1 to 10.
According to this configuration, since the crossflow fan according to any one of claims 1 to 10 is provided, noise can be effectively reduced with a simple shape. An increase in the input of the driving electric motor can be suppressed.

  According to the present invention, since a plurality of cut portions cut in a direction perpendicular to the edge portion are formed at predetermined intervals so as to leave a basic shape portion between the cut portions, the noise is reduced. Can be reduced. Furthermore, since the blade thickness at the edge of the cut portion is smaller than the blade thickness at the edge of the basic shape portion provided adjacently, the collision loss of the air flow flowing into the cut portion is reduced. It is possible to suppress an increase in input of the electric motor for driving the cross flow fan.

The schematic block diagram which shows the air conditioner provided with the crossflow fan which concerns on embodiment of this invention. The perspective view which shows the crossflow fan which concerns on embodiment of this invention. (A) (b) The perspective view which shows the blade | wing of the impeller with which the crossflow fan which concerns on the 1st Embodiment of this invention is provided. The figure for demonstrating the wing | blade in which the notch concerning 1st Embodiment was formed. (A) AA sectional drawing, (b) BB sectional drawing. CC sectional drawing. The figure for demonstrating inflow of the airflow to the notch part which concerns on the 1st Embodiment of this invention. The graph for demonstrating the effect of the crossflow fan which concerns on the 1st Embodiment of this invention. (A) (b) The perspective view which shows the blade | wing of the impeller with which the crossflow fan which concerns on the 2nd Embodiment of this invention is provided. The figure for demonstrating the wing | blade in which the notch concerning 2nd Embodiment was formed. (A) DD sectional drawing, (b) EE sectional drawing. FF sectional drawing. The figure for demonstrating inflow of the airflow to the notch part which concerns on the 2nd Embodiment of this invention. (A) (b) The perspective view which shows the modification of the blade | wing of the impeller with which the crossflow fan which concerns on embodiment of this invention is provided. The figure for demonstrating the modification of the wing | blade in which the notch which concerns on embodiment was formed. GG sectional drawing. (A) (b) The perspective view which shows the modification of the blade | wing of the impeller with which the crossflow fan which concerns on embodiment of this invention is provided. The figure for demonstrating the modification of the wing | blade in which the notch which concerns on embodiment was formed. PP sectional drawing. The figure for demonstrating the effect of the dimple provided in the suction surface of the blade | wing which concerns on embodiment of this invention. The graph for demonstrating the effect of the crossflow fan which concerns on the modification of embodiment of this invention. The figure for demonstrating a crossflow fan. (A) (b) The perspective view which shows the blade | wing of the impeller with which the conventional crossflow fan is provided. The figure for demonstrating the wing | blade in which the conventional notch was formed. (A) HH sectional drawing, (b) II sectional drawing. The figure for demonstrating the crossflow fan in which the impeller was formed with the conventional wing | blade.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 3 to 5, 9 to 11, 14, 15, and 17 to 19, an arrow S indicates the outer peripheral side of the impeller and the blade, and an arrow U indicates the impeller and the blade. The inner circumference side is shown.

(First embodiment)
As shown in FIG. 1, an air conditioner 1 according to this embodiment is a wall-mounted indoor unit, and the air conditioner 1 includes a main body casing 2 and a heat exchanger 3 disposed in the main body casing 2. Or a cross flow fan 4 disposed on the downstream side of the heat exchanger 3.

  An air inlet 21 is provided on the upper surface and the front surface of the main casing 2, and an air outlet 22 is provided on the lower surface of the main casing 2. The air outlet 22 is provided with a vertical blade 23 and a horizontal blade 24 in order to adjust the direction of air blown from the air outlet 22.

  Further, a guide portion 25 for forming a flow path of blown air blown out by the crossflow fan 4 is formed on the back side of the main casing 2 on the blowout side M of the crossflow fan 4. Further, a backflow preventing tongue 26 is formed between the heat exchanger 3 and the air outlet 22 to prevent the backflow of the blown air by separating the blowout side M and the suction side N.

  The heat exchanger 3 is connected to the front heat exchange portion 3a disposed on the front side in the main body casing 2 and the upper end of the front heat exchange portion 3a, and is disposed on the back side in the main body casing 2. It is comprised from the back surface heat exchange part 3b. The air flowing in from the air suction port 21 passes through the heat exchanger 3 to become cooled or heated conditioned air. The conditioned air is blown by the crossflow fan 4 and blown out into the room from the air outlet 22. The

  The crossflow fan 4 is a casing that forms a flow path for an airflow X (see FIG. 7) on the suction side N and the blowout side M of the crossflow fan 4 and an impeller 41 having blades (blades) 42. It consists of a casing 2 and is driven by an electric motor (not shown).

  As shown in FIG. 2, the impeller 41 of the cross flow fan 4 is parallel to a large number of blades 42 at a predetermined interval in the axial direction A1 (that is, the longitudinal direction of the rotating shaft 44 and the longitudinal direction of the blades 42). And a plurality of circular support plates 43 that support the blades 42 and a rotating shaft 44 connected to the electric motor. A plurality of blades 42 are disposed in a forward blade structure between the plurality of support plates 43 with a predetermined blade angle by being fixed to the outer peripheral side end 43a of the support plate 43.

  As shown in FIGS. 3 and 4, the blade 42 has a concavely curved shape on the pressure surface 42 p side, and a plurality of notches are formed in the outer peripheral side edge portion 42 a of the blade 42. A plurality of V-shaped cut portions 42b as viewed from the negative pressure surface 42q side and the pressure surface 42p side of 42 are formed at predetermined intervals so as to leave the basic shape portions 42c between the cut portions 42b.

  That is, a cut portion 42b cut into the outer peripheral side edge portion 42a of the blade 42 from the outer peripheral side edge portion 42a toward the inner peripheral side edge portion 42d (that is, in the direction indicated by the arrow U in the drawing) is predetermined. Since a plurality are formed at intervals, a basic shape portion 42c having a curved basic shape of the blades 42 is left between the cut portions 42b. Here, the “predetermined interval” may be a constant interval or may be an interval in which the interval is changed depending on the position of the blade 42 in the longitudinal direction. For example, since the end 6a of the blade 42 in the axial direction A1 is in the vicinity of the support plate 43, the flow velocity of the airflow X is slower than the central portion 6b of the blade 42 in the axial direction A1. Therefore, in the present embodiment, in order to ensure the pressure area of the blade 42, the interval between the cut portions 42b of the end portion 6a of the blade 42 in the axial direction A1 is set so that the center portion 6b of the blade 42 in the axial direction A1 is cut. It is larger than the interval between the insert portions 42b.

  Further, the size of the cutout (that is, the cutout of the cutout portion 42b) may be all the same, but the size of the cutout may be varied depending on the position in the longitudinal direction of the blade 42, and in the present embodiment, In order to secure the pressure area of the blade 42, the notch of the end portion 6a of the blade 42 in the axial direction A1 is smaller than the notch of the central portion 6b of the blade 42 in the axial direction A1.

  As described above, the cut portion 42b cut into the outer peripheral side edge portion 42a of the blade 42 in the direction perpendicular to the outer peripheral side edge portion 42a (the direction indicated by the arrow U) has a basic shape between the cut portions 42b. A plurality are formed at predetermined intervals so as to leave the portion 42c. For this reason, the wake vortex (not shown) generated on the blowout side M of the crossflow fan 4 can be reduced, and the shape of the outer peripheral side edge 42a is simpler than when the cross-sectional shape is a sawtooth shape. Noise can be effectively reduced.

  Further, as described above, the cut portion 42b is V-shaped when viewed from the suction surface 42q side and the pressure surface 42p side of the blade 42, and therefore the cut portion 42b formed on the outer peripheral side edge portion 42a of the blade 42. The pressure area of the blades 42 can be ensured as compared with the case where is a rectangular shape.

  Here, in this embodiment, as shown in FIG. 5A which is a cross-sectional view of the AA portion shown in FIG. 4 and FIG. 5B which is a cross-sectional view of the BB portion shown in FIG. Further, the blade thickness L2 of the outer peripheral side edge portion 42a of the cut portion 42b is smaller than the blade thickness L1 of the outer peripheral side edge portion 42a of the basic shape portion 42c provided adjacent to the cut portion 42b (that is, It is characterized by being thin.

  More specifically, as shown in FIG. 6 which is a cross-sectional view of the CC portion shown in FIG. 4 and the like, the blade surface in the cut portion 42b is the basic shape of the pressure surface 42p, and the suction surface 42q. A recess 42t is formed. By forming the recess 42t in the suction surface 42q in this way, the blade thickness L2 of the outer peripheral side edge portion 42a of the cut portion 42b is greater than the blade thickness L1 of the outer peripheral side edge portion 42a of the adjacent basic shape portion 42c. The blade thickness L in the cross section in the longitudinal direction of the blade 42 changes so as to decrease. The blade thickness L1 is the same as the blade thickness L5 of the outer peripheral side edge portion 242a of the conventional cut portion 242b.

  With such a configuration, compared to the case where the blade thickness L2 of the outer peripheral side edge portion 42a of the cut portion 42b is the same as the blade thickness L1 or larger (that is, thicker) than the blade thickness L1, the cut portion 42b The area of the end face 42y of the outer peripheral edge 42a can be reduced. Therefore, as shown in FIG. 7, it is possible to reduce the collision loss when the airflow X flows into the cut portion 42b provided in the outer peripheral side edge portion 42a.

  In the present embodiment, as shown in FIGS. 3 and 5, the cut portion 42 b is an outer peripheral side edge portion 42 a that is cut in a direction parallel to the chord 5 (see FIG. 5B). The blade thickness L2 is formed so as to gradually increase from the end toward the inner peripheral edge 42d. For this reason, the blade chord 5 has a blade thickness L2 of the outer peripheral side edge portion 42a of the cut portion 42b so as to be smaller than the blade thickness L1 of the outer peripheral side edge portion 42a of the adjacent basic shape portion 42c. In the parallel direction, the pressure surface 42p and the suction surface 42q of the blade 42 can be formed with smooth curved surfaces.

  Moreover, in this embodiment, as shown in FIG. 6, the notch part 42b is a basic shape from the notch part 42b in the boundary part 42e of the notch part 42b and the basic shape part 42c in the longitudinal direction of the wing | blade 42. The blade thickness L is formed so as to gradually increase toward the portion 42c. For this reason, the longitudinal direction of the blade 42 is set such that the blade thickness L2 of the outer peripheral edge 42a of the cut portion 42b is smaller than the blade thickness L1 of the outer peripheral edge 42a of the basic shape portion 42c provided adjacently. In the direction, the blade thickness L can be continuously changed so that no step is formed at the boundary 42e.

According to the cross flow fan 4 of the present embodiment, the following effects can be obtained.
(1) The blade thickness L2 of the outer peripheral side edge portion 42a of the cut portion 42b is formed smaller than the blade thickness L1 of the outer peripheral side edge portion 42a of the basic shape portion 42c provided adjacent to the cut portion 42b. Therefore, the area of the end face 42y of the outer peripheral edge 42a can be reduced, and the collision loss when the airflow X flows into the cut portion 42b can be reduced. As a result, as shown in FIG. 8, the input of the electric motor for driving the cross flow fan 4 can be reduced as compared with the input of the conventional electric motor, and the input of the electric motor due to the formation of the notch can be reduced. Increase can be suppressed. That is, FIG. 8 is an air flow-motor input characteristic diagram for the cross flow fan 4 according to the present embodiment and the conventional cross flow fan 204. In FIG. 8, the solid line represents the cross flow fan 4 of the present invention. The alternate long and short dash line is for the conventional cross flow fan 204. The horizontal axis in FIG. 8 indicates the air volume, and one scale on the horizontal axis is 0.5 m ³ / min. Moreover, the vertical axis | shaft of FIG. 8 has shown the motor input, and the 1 scale of a vertical axis | shaft is 5W.

  (2) The cut portion 42b is formed so that the blade thickness L2 gradually increases in the direction parallel to the chord 5 from the cut outer peripheral edge portion 42a toward the inner peripheral edge portion 42d. Therefore, the pressure surface 42p and the suction surface 42q of the blade 42 can be formed with smooth curved surfaces in a direction parallel to the chord 5 so that the blade thickness L2 is smaller than the blade thickness L1. Accordingly, the air flow X can be prevented from being disturbed, and an increase in the input of the electric motor for driving the cross flow fan 4 can be further suppressed.

  (3) The cut portion 42b has a blade thickness L that gradually increases from the cut portion 42b toward the basic shape portion 42c at the boundary portion 42e between the cut portion 42b and the basic shape portion 42c in the longitudinal direction of the blade 42. Thus, the blade thickness L can be continuously changed in the longitudinal direction of the blade 42 so that the blade thickness L2 is smaller than the blade thickness L1. Accordingly, the airflow X can be prevented from being disturbed as compared with the case where a step is formed at the boundary portion 42e between the cut portion 42b and the basic shape portion 42c, and the electric motor for driving the crossflow fan 4 can be prevented. The increase in input can be further suppressed.

  (4) The blade shape in the cut portion 42b is such that the pressure surface 42p remains the basic shape, and the recess 42t is formed in the suction surface 42q, so that the blade thickness L2 is smaller than the blade thickness L1. Therefore, the pressure applied to the airflow X can be increased as compared with the case where a depression (not shown) is formed on the pressure surface 42p.

  (5) The notch 42 b is provided on the outer peripheral side edge 42 a of the blade 42, and on the suction side N of the crossflow fan 4, from the outer peripheral side of the blade 42 so as to resist the rotation of the impeller 41. The air flow X flows into the cut portion 42b. For this reason, compared with the case where the notch part 42b is provided in the inner peripheral side edge part 42d, it is possible to further reduce the collision loss when the air flow X flows into the notch part 42b. An increase in the input of the driving electric motor can be further suppressed.

  Further, in the present embodiment, the air conditioner 1 includes the cross flow fan 4 that can obtain the effects (1) to (5). Therefore, the same effects as the above (1) to (5) can be obtained. Obtainable.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, about the whole structure of the air conditioner concerning this embodiment, the structure of a crossflow fan, etc., since it is the same as that of the above-mentioned 1st Embodiment, detailed description is abbreviate | omitted here.

  In the present embodiment, as shown in FIGS. 9 and 10, a plurality of notches are formed in the inner peripheral side edge portion 42 d of the blade 42, so that the suction surface 42 q side and the pressure surface 42 p side of the blade 42 are formed. When viewed from above, a plurality of V-shaped cut portions 42b are formed at predetermined intervals so as to leave the basic shape portions 42c between the cut portions 42b.

  That is, the notch 42b cut into the inner peripheral edge 42d of the blade 42 from the inner peripheral edge 42d toward the outer peripheral edge 42a (that is, in the direction indicated by the arrow S in the drawing). Since a plurality are formed at a predetermined interval, a basic shape portion 42c having a curved basic shape of the blades 42 is left between the cut portions 42b. That is, the basic shape part 42c is a non-cut part which is not cut without a notch being formed. Here, the “predetermined interval” may be a constant interval or may be an interval in which the interval is changed depending on the position of the blade 42 in the longitudinal direction.

  As described above, the cut portion 42b cut into the inner circumferential side edge portion 42d of the blade 42 in the direction perpendicular to the inner circumferential side edge portion 42d (the direction indicated by the arrow S) is between the cut portions 42b. A plurality of basic shape portions 42c are formed at predetermined intervals so as to leave them. For this reason, the wake vortex (not shown) generated on the suction side N of the crossflow fan 4 is reduced, and the noise is reduced with a simpler shape compared to the case where the cross-sectional shape of the inner peripheral side edge portion 42d is serrated. Can be effectively reduced.

  Further, as described above, the cut portion 42b is V-shaped when viewed from the negative pressure surface 42q side and the pressure surface 42p side of the blade 42, and therefore the cut portion formed in the inner peripheral side edge portion 42d of the blade 42. Compared with the case where 42b is rectangular, the pressure area of the wing | blade 42 is securable.

  Here, in the present embodiment, as shown in FIG. 11A which is a cross-sectional view of the DD portion shown in FIG. 10 and FIG. 11B which is a cross-sectional view of the EE portion shown in FIG. Further, the blade thickness L4 of the inner peripheral side edge portion 42d of the cut portion 42b is smaller than the blade thickness L3 of the inner peripheral side edge portion 42d of the basic shape portion 42c provided adjacent to the cut portion 42b. It is characterized by being formed.

  More specifically, as shown in FIG. 12, which is a cross-sectional view of the FF portion shown in FIG. 10, the blade shape in the cut portion 42b is basically the pressure surface 42p as in the first embodiment. The shape remains the same, and a recess 42t is formed on the suction surface 42q. By forming the recess 42t in the negative pressure surface 42q in this way, the blade thickness L4 of the inner peripheral side edge portion 42d of the cut portion 42b is equal to the blade thickness of the inner peripheral side edge portion 42d of the adjacent basic shape portion 42c. The blade thickness L in the longitudinal section of the blade 42 changes so as to be smaller than L3.

  With such a configuration, the inner peripheral side of the cut portion 42b is larger than the case where the blade thickness L4 of the inner peripheral side edge portion 42d of the cut portion 42b is the same as or larger than the blade thickness L3. The area of the end face 42z of the edge portion 42d can be reduced. Therefore, as shown in FIG. 13, it is possible to reduce the collision loss when the airflow X flows into the cut portion 42b provided in the inner peripheral edge portion 42d.

  Moreover, in this embodiment, as shown in FIG.9 and FIG.11, the notch part 42b is the inner peripheral side edge part cut in the direction parallel to the chord 5 (refer FIG.11 (b)). The blade thickness L4 is formed so as to gradually increase from 42d toward the outer peripheral edge 42a. For this reason, the chord thickness L4 of the inner peripheral side edge portion 42d of the cut portion 42b is smaller than the blade thickness L3 of the inner peripheral side edge portion 42d of the basic shape portion 42c provided adjacently. 5, the pressure surface 42p and the suction surface 42q of the blade 42 can be formed with smooth curved surfaces.

  Also in the present embodiment, as in the first embodiment, the cut portion 42b is a boundary portion 42e between the cut portion 42b and the basic shape portion 42c in the longitudinal direction of the blade 42 as shown in FIG. The blade thickness L is gradually increased from the cut portion 42b toward the basic shape portion 42c. For this reason, the blade 42 has a blade thickness L4 of the inner peripheral edge 42d of the cut portion 42b so as to be smaller than the blade thickness L3 of the inner peripheral edge 42d of the basic shape portion 42c provided adjacent thereto. In the longitudinal direction, the blade thickness L can be continuously changed so that no step is formed at the boundary 42e.

According to the cross flow fan 4 of the present embodiment, the following effects can be obtained.
(6) The blade thickness L4 of the inner peripheral side edge portion 42d of the cut portion 42b is formed smaller than the blade thickness L3 of the inner peripheral side edge portion 42d of the basic shape portion 42c provided adjacent to the cut portion 42b. Therefore, the area of the end surface 42z of the inner peripheral edge 42d can be reduced, and the collision loss when the airflow X flows into the cut portion 42b can be reduced. As a result, the input of the electric motor for driving the cross flow fan 4 can be reduced as compared with the input of the conventional electric motor, and the increase in the input of the electric motor due to the formation of the notch can be suppressed. it can.

  (7) The cut portion 42b is formed such that the blade thickness L4 gradually increases in the direction parallel to the chord 5 from the cut inner peripheral edge portion 42d toward the outer peripheral edge portion 42a. Therefore, the pressure surface 42p and the suction surface 42q of the blade 42 can be formed with smooth curved surfaces in a direction parallel to the chord 5 so that the blade thickness L4 is smaller than the blade thickness L3. Accordingly, the air flow X can be prevented from being disturbed, and an increase in the input of the electric motor for driving the cross flow fan 4 can be further suppressed.

  (8) The cut portion 42b has a blade thickness L that gradually increases from the cut portion 42b toward the basic shape portion 42c at the boundary portion 42e between the cut portion 42b and the basic shape portion 42c in the longitudinal direction of the blade 42. Thus, the blade thickness L can be continuously changed in the longitudinal direction of the blade 42 so that the blade thickness L4 is smaller than the blade thickness L3. Accordingly, the airflow X can be prevented from being disturbed as compared with the case where a step is formed at the boundary portion 42e between the cut portion 42b and the basic shape portion 42c, and the electric motor for driving the crossflow fan 4 can be prevented. The increase in input can be further suppressed.

  (9) The blade shape in the cut portion 42b is such that the pressure surface 42p remains the basic shape, and the recess 42t is formed in the suction surface 42q, so that the blade thickness L4 is smaller than the blade thickness L3. Therefore, the pressure applied to the airflow X can be increased as compared with the case where a depression (not shown) is formed on the pressure surface 42p.

  In the present embodiment, the air conditioner 1 includes the cross flow fan 4 that can obtain the effects (6) to (9). Therefore, the air conditioner 1 has the same effects as the above (6) to (9). Obtainable.

  In addition, this invention is not limited to the said embodiment, A various design change is possible based on the meaning of this invention, and they are not excluded from the scope of the present invention. For example, you may change the said embodiment as follows.

  In the above-described embodiment, the cut portion 42b is provided in only one of the inner peripheral side and outer peripheral side edges of the blade 42 (that is, the outer peripheral side edge 42a or the inner peripheral side edge 42d). The cut portion 42b may not be provided on only one side. That is, the cut portion 42b may be provided on both the inner peripheral side and outer peripheral side edge portions of the blade 42 (that is, the outer peripheral side edge portion 42a and the inner peripheral side edge portion 42d).

  If comprised in this way, since the notch part 42b is provided in the outer peripheral side edge part 42a and the inner peripheral side edge part 42d of the wing | blade 42, a noise can be reduced more effectively, and cross On the suction side N of the flow fan 4, it is possible to reduce a collision loss when the air flow X flows into the cut portion 42 b from the outer peripheral side of the blade 42. Furthermore, on the blowout side M of the cross flow fan 4, it is possible to reduce a collision loss when the air flow X flows into the cut portion 42b from the inner peripheral side of the blade 42. Accordingly, it is possible to reduce the collision loss while reducing the noise more effectively than when the cut portion 42b is provided only in one of the outer peripheral side edge 42a and the inner peripheral side edge 42d. It is possible to suppress an increase in the input of the electric motor for driving the cross flow fan 4.

  In the above embodiment, the blade shape in the cut portion 42b is the basic shape of the pressure surface 42p, and the indentation 42t is formed in the suction surface 42q, so that the blade thickness L2 is smaller than the blade thickness L1. Although the blade thickness L4 is formed smaller than the blade thickness L3, it does not have to be configured in this way. That is, for example, the blade shape in the cut portion 42b may be formed so that the blade thickness L2 is smaller than the blade thickness L1 by forming a depression (not shown) in the pressure surface 42p. By forming a recess (not shown) in the surface 42p, the blade thickness L4 may be smaller than the blade thickness L3. Even if comprised in this way, the effect of said (1)-(3) or (6)-(8) can be acquired.

  In the above embodiment, the cut portion 42b is V-shaped, and at the boundary portion 42e between the cut portion 42b and the basic shape portion 42c in the longitudinal direction of the wing 42, the basic shape portion 42c is formed from the cut portion 42b. Although the blade thickness L is formed so as to gradually increase toward the top, it does not have to be configured in this way.

  For example, as shown in FIGS. 14 and 15, the cut portion 42b formed in the outer peripheral side edge portion 42a may have a rectangular shape when viewed from the negative pressure surface 42q side and the pressure surface 42p side of the blade 42. The cross-sectional view of the AA portion and the cross-sectional view of the BB portion shown in FIG. 15 are the same as FIGS. 5A and 5B, respectively. The cut portion 42b formed in the inner peripheral side edge portion 42d may have a rectangular shape when viewed from the negative pressure surface 42q side and the pressure surface 42p side of the blade 42.

  Then, in the longitudinal direction of the blade 42, the blade thickness L does not gradually increase as the cut portion 42b formed in the rectangular shape as described above moves from the cut portion 42b to the basic shape portion 42c. As shown in FIG. 16 which is a cross-sectional view of the GG portion indicated by, a step 42f may be formed at a boundary portion 42e between the cut portion 42b and the basic shape portion 42c. Even if comprised in this way, the effect of said (1) and (2) or (6) and (7) can be acquired.

  In the above embodiment, the cut portion 42b is formed so that the blade thicknesses L2 and L4 gradually increase from the cut edge to the other edge in the direction parallel to the chord 5. However, it does not have to be configured in this way. That is, if the blade thickness L2 at the edge of the cut portion 42b is smaller than the blade thickness L1 at the edge of the basic shape portion 42c, the effect (1) can be obtained, and the cut portion If the blade thickness L4 of the edge part of 42b is formed smaller than the blade thickness L3 of the edge part of the basic shape part 42c, the effect of said (6) can be acquired. Further, as described above, the cut portions 42b may be formed on both the inner peripheral side and the outer peripheral side of the wing 42, that is, both the inner peripheral side and the outer peripheral side of the wing 42. The cut portion 42b is formed in at least one of the edge portions, and the blade thickness of the edge portion of the cut portion 42b may be formed smaller than the blade thickness of the edge portion of the basic shape portion 42c.

  -The turbulent boundary layer control structure for suppressing that the air which is the gas which flows in into the blade | wing 42 peels in the suction surface 42q of the blade | wing 42 may be provided. The turbulent boundary layer control structure is a structure (dimple, groove, rough surface, etc.) for transitioning the boundary layer from laminar flow to turbulent flow. When the turbulent boundary layer control structure is provided, the turbulent boundary layer control structure works on the blade 42. The pressure resistance can be reduced, and the input of the electric motor for driving the crossflow fan can be reduced as compared with the case where the turbulent boundary layer control structure is not provided. In particular, when the outer peripheral edge 42a of the blade 42 is cut and a notch is formed in the blade 42, the gas of the flow whose two-dimensionality is broken (that is, the flow having three-dimensionality) is impeller. 41 (i.e., wing 42), the turbulent boundary such as dimples and irregular rough surfaces whose cross-sectional shape changes in the axial direction A1 and the direction orthogonal to the axial direction A1 (i.e., two directions orthogonal to each other). By providing the layer control structure, separation of the air flow flowing into the blades 42 can be effectively suppressed.

  For example, as shown in FIGS. 17 and 18, dimples 42 h may be provided on the suction surface 42 q of the blade 42 as a turbulent boundary layer control structure that transitions the boundary layer from laminar flow to turbulent flow. The dimple 42h is a small depression having a predetermined depth and a concave spherical bottom surface. A plurality of dimples 42 h are formed in the vicinity of the outer peripheral side edge 42 a of the blade 42 along the air flow direction on the negative pressure surface 42 q of the blade 42. The direction in which air flows on the suction surface 42q of the blade 42 is a direction substantially perpendicular to the axial direction A1. From the viewpoint of securing the depth of the dimple 42h, the dimple 42h is preferably provided in the basic shape portion 42c formed between the cut portions 42b.

  Further, when a plurality of dimples 42h are formed along the air flow direction on the suction surface 42q of the blade 42, as shown in FIG. 19 which is a cross-sectional view of the PP portion shown in FIG. The dimple 42j formed away from the edge 42a is preferably formed to have a smaller depth than the dimple 42i formed nearer to the outer peripheral side edge 42a than the dimple 42j. That is, it is preferable that the depth of the plurality of dimples 42h formed in the vicinity of the outer peripheral edge 42a becomes shallower toward the inner peripheral edge 42d. 18 is the same as FIG. 5B, and the blade thickness L of the dimple 42h is not included in the blade thickness L1 of the outer peripheral edge 42a of the basic shape portion 42c. . In addition, the “dimple depth” here is the maximum depth of the dimple.

  When the depth of the dimples 42h is reduced, as shown in FIG. 18, three rows of dimples 42h in which one row is arranged in the axial direction A1 (that is, the longitudinal direction of the blades 42) are formed. In some cases, the two rows of dimples 42h may be configured to the same depth. Specifically, among the plurality of dimples 42h, the depth of the third row of dimples 42j formed away from the outer peripheral edge portion 42a is set to be two rows formed closer to the outer peripheral edge portion 42a. The dimples 42i and 42k may be formed so as to have the same depth by making them smaller than the depth of the dimples 42i and 42k. That is, the plurality of dimples 42h that become shallower from the outer peripheral side edge 42a toward the inner peripheral side edge 42d are several dimples constituting the plurality of dimples 42h provided in the vicinity of the outer peripheral side edge 42a. Alternatively, all the dimples constituting the plurality of dimples 42h provided in the vicinity of the outer peripheral edge portion 42a may be used. Further, as shown in FIG. 18, the second row of dimples 42k provided between the first row of dimples 42i and the third row of dimples 42j are arranged in the axial direction A1 as compared with the two rows of dimples 42i and 42j. They may be formed with a half pitch shift.

  Since the dimple 42h is provided as described above, the boundary layer on the suction surface 42q of the blade 42 can be changed from laminar flow to turbulent flow. Therefore, the deceleration of the air flow in the boundary layer is reduced, and the air flow flowing into the impeller 41 (that is, the blades 42) is prevented from being separated from the blades 42 as shown by the air flow X in FIG. can do. As a result, the pressure resistance acting on the blade 42 can be reduced, and the input of the electric motor for driving the crossflow fan can be reduced as compared with the case where the dimple 42h is not provided, as shown by the two-dot chain line in FIG. Can be reduced. In FIG. 20, the broken line indicates the air flow when the dimple 42h is not provided. FIG. 21 is an air flow-motor input characteristic diagram similar to FIG. 8. In FIG. 21, the two-dot chain line is for the cross flow fan 4 provided with the dimple 42h, and the solid line is It is about the cross flow fan 4 of 1st Embodiment, Comprising: A dashed-dotted line is about the conventional cross flow fan 204. FIG.

  Further, if the turbulent boundary layer control structure is the dimple 42h, the turbulent boundary layer control structure flows into the blade 42 compared to the case where the turbulent boundary layer control structure is a groove (not shown) extending along the air flow direction. It is possible to increase the effect of suppressing gas peeling. That is, if the turbulent boundary layer control structure is the dimple 42h, the boundary layer is changed from the laminar flow to the turbulent flow, and a secondary flow is generated in the dimple 42h, thereby generating shear at the bottom of the boundary layer. The power can be reduced. Therefore, it is possible to further suppress separation of the air flow flowing into the blade 42 from the blade 42.

  In particular, the blade 42 of the present invention is formed with a plurality of cut portions 42b at a predetermined interval, so that the effect of reducing air flow separation in the dimple 42h is greater than when the cut portions 42b are not formed. can do. That is, when there is no notch 42b, the edge is straight and the two-dimensionality of the air flow is strong, and when the dimple 42h is provided on the wing where the notch 42b is not formed, sufficient separation is achieved. A reduction effect cannot be obtained. On the other hand, since the blade 42 in which the cut portion 42b is formed has a notch at the edge, air that tends to flow into the impeller 41 easily flows into the cut portion 42b, and the two-dimensionality is improved. The dimple 42h can effectively suppress separation of the broken flow of air from the blades 42.

  Further, since the dimple 42h is provided in the basic shape portion 42c formed between the cut portions 42b, the dimple 42h having a desired depth is formed as compared with the case where the dimple 42h is provided in the cut portion 42b. Can be made easier. That is, since the basic shape portion 42c has a larger blade thickness L than the cut portion 42b, the depth of the dimple 42h can be easily secured.

  Further, since the depth of the plurality of dimples 42h formed in the vicinity of the outer peripheral edge 42a becomes shallower toward the inner peripheral edge 42d, the dimple formed away from the outer peripheral edge 42a of the blade 42 is formed. 42j has a smaller depth than the dimple 42i formed closer to the outer peripheral edge 42a than the dimple 42j. In this way, by making the depths of the plurality of dimples 42h different, the secondary air flow in the dimple 42j provided away from the outer peripheral edge 42a having a small effect of suppressing the development of the boundary layer. The loss due to can be suppressed. Further, since the dimple 42j has a smaller effect of suppressing the development of the boundary layer than the dimple 42i provided near the outer peripheral side edge 42a, the effect of suppressing air separation by the plurality of dimples 42h is maintained. The Therefore, the input of the electric motor for driving the cross flow fan can be reduced as compared with the case where the depths of the plurality of dimples 42h are the same.

  Further, the dimple 42h is formed such that the depth of the plurality of dimples 42h formed in the vicinity of the outer peripheral side edge portion 42a becomes shallower toward the inner peripheral side edge portion 42d. It is possible to easily form a plurality of dimples 42h (that is, dimples 42i, 42j, and 42k) along the air flow direction on the suction surface 42q of the blade 42. That is, since the blades 42 are curved, when forming a plurality of blades 42 using a single mold (not shown), the dimples 42h are formed when the molds are removed after the blades 42 are formed. If a protrusion (not shown) formed on the mold interferes with the wing 42, it is difficult to remove the mold from the wing 42. Therefore, the dimple 42j provided away from the outer peripheral side edge 42a is formed to have a smaller depth than the dimple 42i provided near the outer peripheral side edge 42a. It is possible to prevent the protrusion provided on the mold to form the dimple 42j away from the portion 42a from interfering with the blade 42 when the mold is removed. As a result, the mold for forming the blade 42 can be easily removed, and it is easy to form a plurality of dimples 42h along the direction in which air flows on the negative pressure surface 42q of the blade 42 using the mold. it can.

  In addition, although the case where the dimple 42h was provided in the wing | blade 42 which concerns on 1st Embodiment was demonstrated with reference to drawings, you may provide the dimple 42h in any of the said wing | blades 42 other than 1st Embodiment.

  Further, dimples (not shown) as a turbulent boundary layer control structure may be formed on the suction surface 42q of the blade 42 in the vicinity of the inner peripheral edge portion 42d, and the inner peripheral side and the outer peripheral side of the blade 42 may be formed. Dimples may be formed in the vicinity of both edges of the two edges.

  When a plurality of dimples are formed in the vicinity of the inner peripheral edge 42d along the air flow direction on the suction surface 42q of the blade 42, the depth of the plurality of dimples is determined by the inner peripheral edge 42d. It is preferable that it becomes shallow as it goes to the outer peripheral side edge part 42a. That is, for the dimples (not shown) formed in the vicinity of the inner peripheral edge 42d, the dimples (not shown) formed away from the inner peripheral edge 42d are formed near the outer peripheral edge 42a. It is preferable that the depth be smaller than a dimple (not shown). Therefore, when dimples are formed in the vicinity of both edges on the inner peripheral side and the outer peripheral side of the blade 42, the depths of the plurality of dimples formed in the vicinity of the outer peripheral side edge 42a. Is shallower from the outer peripheral edge 42a toward the inner peripheral edge 42d, and the depth of the plurality of dimples formed in the vicinity of the inner peripheral edge 42d is from the inner peripheral edge 42d to the outer peripheral edge. It is preferable that the depth becomes shallower toward the portion 42a.

  L1: blade thickness of outer peripheral side edge of basic shape portion, L2: blade thickness of outer peripheral side edge of cut portion, L3: blade thickness of inner peripheral side edge of basic shape portion, L4: inside of cut portion Blade thickness at peripheral edge, S ... outer peripheral side, U ... inner peripheral side, X ... air flow, 1 ... air conditioner, 2 ... main body casing, 3 ... heat exchanger, 4 ... cross flow fan, 5 ... blade String, 5a ... center part of chord, 41 ... impeller, 42 ... wing, 42a ... outer peripheral side edge (edge), 42b ... notch, 42c ... basic shape part, 42d ... inner peripheral side edge ( Edge), 42e ... boundary part, 42h, 42i, 42j, 42k ... dimple, 42p ... pressure surface, 42q ... negative pressure surface, 42t ... depression, 42y ... end face of outer peripheral side edge, 42z ... inner peripheral side edge part End face, 43... Support plate, 44.

Claims (11)

In the cross flow fan in which the impeller is formed by the blades curved on the pressure surface side,
At least one of the inner peripheral side and the outer peripheral side edge of the wing is cut at a right angle from the edge so that a basic shape portion remains between the cut portions. Are formed at a predetermined interval, and a recess is formed on one of the pressure surface and the suction surface of the blade, so that the blade thickness of the edge of the cut portion is adjacent to the cut portion. and is smaller than the blade thickness of the edge of the basic shape portion provided in the longitudinal direction of the cross section of the blade, the other surface of the recess is not formed Ri straight der, the switching of adjacent A cross flow fan , wherein a boundary portion between the insertion portion and the basic shape portion extends in parallel to the perpendicular direction .   In the direction parallel to the chord, the notch has a blade thickness that gradually decreases from one edge of the inner edge of the wing to the other edge of the outer edge. The crossflow fan according to claim 1, wherein the crossflow fan is formed to be large.   The cut portion is V-shaped when viewed from the suction surface side and the pressure surface side of the blade, and the cut portion is a boundary portion between the cut portion and the basic shape portion in the longitudinal direction of the blade. The crossflow fan according to claim 1 or 2, wherein the blade thickness is formed so as to gradually increase from the cut portion toward the basic shape portion.   The blade shape in the notch is that the pressure surface remains the basic shape, and the indentation is formed in the suction surface, so that the blade thickness of the edge of the notch is adjacent to the basic shape portion. The crossflow fan according to any one of claims 1 to 3, wherein the crossflow fan is formed smaller than a blade thickness of an edge portion.   The suction surface of the blade is provided with a turbulent boundary layer control structure for transitioning the boundary layer from laminar flow to turbulent flow in order to suppress separation of gas flowing into the blade. The crossflow fan according to any one of claims 1 to 4.   The crossflow fan according to claim 5, wherein the turbulent boundary layer control structure is provided in a basic shape portion formed between the cut portions.   The crossflow fan according to claim 5 or 6, wherein the turbulent boundary layer control structure is a dimple. A plurality of the dimples are formed in the vicinity of at least one of the inner peripheral side and the outer peripheral side of the blade along the gas flow direction on the negative pressure surface of the blade;
8. The crossflow fan according to claim 7, wherein the depth of the plurality of dimples becomes shallower from one edge where the dimple is formed in the vicinity to the other edge.   The said cut | notch part is provided in the outer peripheral side edge part of the both inner peripheral side of the said wing | blade, and an outer peripheral side edge part, The Claim 1 thru | or 8 characterized by the above-mentioned. Cross flow fan.   The cross flow fan according to any one of claims 1 to 9, wherein the cut portion is provided on both the inner peripheral side and the outer peripheral side of the blade.   An air conditioner comprising the crossflow fan according to any one of claims 1 to 10.

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