JPWO2015030048A1 - Propeller fan, blower and outdoor unit - Google Patents

Abstract

The propeller fans 1, 201, 301, 401 include a boss 3 and a plurality of blades 5 provided on the outer periphery of the boss 3, and at least one of the blades 5 has a negative pressure surface 15 with protrusions 17, 217, 317. , 417, and the protrusions 17, 217, 317, 417 extend in the rotational direction at positions away from the outer peripheral edge of the wing, and the radially inner base of the protrusions 17, 217, 317, 417 The inclination of 17a is gentler than the inclination of the radially outer skirt portion 17b of the projecting portions 17, 217, 317, 417, and the blowout flow is made uniform in the radial direction, thereby suppressing local high-speed flow.

Description

  The present invention relates to a propeller fan, a blower, and an outdoor unit.

  At present, various blade shapes have been proposed in order to realize a low noise and high efficiency blower. The noise and loss of the fan increases with the turbulence of the air flow and the magnitude of the wind speed. Therefore, to reduce the noise and increase the efficiency of the fan, reduce the turbulence of the air flow generated around the blades. In addition, it is necessary to suppress the occurrence of local high wind speed portions as much as possible.

  As an existing fan, for example, in Patent Document 1, an airflow flowing into the suction surface of the blade is provided on the edge on the rear side in the rotation direction of the suction surface of the blade, by providing a protrusion substantially along the extending direction of the blade. Fans have been disclosed that attempt to avoid abrupt collisions with the airflow flowing into the pressure surface of the blade.

  Patent Document 2 discloses a fan that is intended to form a thick part at the trailing edge of the blade and reattach the peeled airflow at the thick part.

  Patent Document 3 discloses a fan that is curved so that the outer peripheral portion has a concave shape and the boss side has a convex shape with respect to the airflow suction side.

  Furthermore, Patent Document 4 discloses a fan that rectifies the flow of blades by providing a ring-shaped member. Patent Document 5 discloses a fan that is intended to hold a blade tip vortex by providing a groove extending in a generally circumferential direction on the suction surface of the blade.

Japanese Patent Laying-Open No. 2013-19335 (FIG. 4) Japanese Patent Laying-Open No. 2005-76501 (FIG. 2) JP 2011-179330 A (FIG. 4) Japanese Unexamined Patent Publication No. 2009-257260 (FIGS. 1 and 2) JP 2000-192898 A (FIG. 6)

  A blade tip vortex is generated at a radially outer peripheral end of the blade suction surface of the rotating fan by a flow leaking from the pressure surface to the suction surface, and a low pressure portion is formed on the blade surface. Therefore, the airflow flowing on the suction surface flows toward the outside of the radius. As a result, the air flow blown out from the suction surface has a distribution that is biased toward the outside of the radius, and there is a problem that the blown-out air speed increases.

  In relation to the above problem, in the fan disclosed in Patent Document 1, it may be possible to reduce turbulence at the time of airflow merging between the pressure surface and the suction surface at the trailing edge due to the protrusion, There is still a possibility that the blown airflow is biased radially outward.

  Also in the fan disclosed in Patent Document 2, the thick portion is an aspect of a convex shape, and there is still a possibility that the blown airflow is biased radially outward, as in the case of the fan disclosed in Patent Document 1.

  In the fan disclosed in Patent Document 3, by providing a convex shape on the suction surface of the blade, the airflow at the boss side tends to stay on the inner side in the radial direction, but on the outer side in the radial direction from the apex of the convex shape. The airflow tends to flow radially outward due to the inclination, and the blowout wind speed may become uneven. Also, since the suction side airflow is directed to the boss side, it can be seen that the entire suction side is inclined toward the boss side, and on the pressure side, the blade surface is inclined upstream from the boss side toward the outer peripheral side. Is formed, the flow tends to leak from the pressure surface to the suction surface, and the leakage vortex may increase.

  Further, in the fan disclosed in Patent Document 4, there is an effect of partitioning the flow between the inner side and the outer side in the radial direction with the ring-shaped member as a boundary, but when the flow over the ring-shaped member is generated due to the turbulent flow between the blades On the other hand, there is a possibility that large peeling will occur. Furthermore, in the fan disclosed in Patent Document 5, if the vortex is held in the groove portion, the flow is deviated, and there is a possibility that the blown air speed is deviated.

  The present invention has been made in view of the above, and an object of the present invention is to provide a propeller fan in which the blow-out flow is made uniform in the radial direction and local high-speed flow can be suppressed.

In order to achieve the above-described object, the present invention provides a propeller fan including a boss and a plurality of blades provided on an outer periphery of the boss, wherein at least one of the blades has a protrusion on the suction surface. The protrusion extends in the rotational direction at a position away from the outer peripheral edge of the wing, and the inclination of the radially inner skirt of the protrusion is the inclination of the radially outer skirt of the protrusion. It is gentler than the slope.
You may make it the height of the said protrusion part become so large that it goes back from the front of a rotation direction. Moreover, you may make it the protrusion part non-formation part exist in the trailing edge side of the said suction surface in the said wing | blade. You may make it the vertex of the said protrusion part be located so that the front side of the rotation direction RD may approach the said boss | hub. You may make it the said protrusion part be comprised by the curved surface.
Furthermore, a blower according to the present invention for achieving the same object accommodates the above-described propeller fan according to the present invention, a drive source for applying a driving force to the propeller fan, the propeller fan, and the drive source. A casing.
Furthermore, an outdoor unit according to the present invention for achieving the same object includes the above-described propeller fan according to the present invention, a drive source that applies driving force to the propeller fan, the propeller fan, the drive source, and the heat. And a casing for accommodating the exchanger.

  According to the present invention, the blow-out flow is made uniform in the radial direction, and local high-speed flow can be suppressed.

It is a perspective view which shows the outline of the propeller fan which concerns on Embodiment 1 of this invention. It is a top view of the propeller fan of FIG. It is sectional drawing by the II line | wire of FIG. It is a perspective view which shows the suction surface about one blade regarding the propeller fan which concerns on Embodiment 1 of this invention. It is a figure explaining the flow of airflow in FIG. It is a figure of the same aspect as FIG. 5 about the explanatory example in which the effect of this invention is not acquired. It is a top view of the propeller fan which concerns on Embodiment 2 of this invention. (A), (b) and (c) are sectional views taken along lines VIIIa, VIIIb and VIIIc in FIG. 7, respectively. It is a top view of the propeller fan which concerns on Embodiment 3 of this invention. (A), (b) and (c) are sectional views taken along lines Xa, Xb and Xc in FIG. 9, respectively. It is a top view of the propeller fan which concerns on Embodiment 4 of this invention. (A), (b) and (c) are sectional views taken along lines XIIa, XIIb and XIIc in FIG. 11, respectively. It is a perspective view which shows the cross section of (c) of FIG. 12 about one propeller, and the part of the rotation direction front side rather than the cross section regarding the propeller fan which concerns on Embodiment 4 of this invention. It is a perspective view when the outdoor unit which concerns on Embodiment 6 of this invention is seen from the blower outlet side. It is a figure for demonstrating the structure of an outdoor unit from the upper surface side regarding this Embodiment 6. FIG. It is a figure which shows the state which removed the fan grille regarding this Embodiment 6. FIG. It is a figure which removes a front panel etc. further about this Embodiment 6, and shows an internal configuration.

  Embodiments of a propeller fan according to the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an outline of the propeller fan according to the first embodiment. An arrow with a symbol RD indicates a rotation direction RD of the propeller fan 1, and an arrow with a symbol FD indicates a flow direction FD of an air flow during blowing.

  The propeller fan 1 includes a boss 3 having a rotation axis RA and a plurality (three in the illustrated example) of blades 5. The boss 3 is provided so as to be rotatable about the rotation axis RA. The plurality of wings 5 are provided on the side surface 3 a of the boss 3. In addition, as an example, the plurality of blades 5 are formed in the same shape and are arranged at equiangular intervals. In addition, as this invention, it is not limited to this, You may vary the angular interval and shape of arrangement | positioning for every one wing | blade or each wing | blade.

  Each wing 5 has a leading edge 7, a trailing edge 9, and an outer peripheral edge 11. The leading edge 7 is a front edge in the rotational direction of the blade 5, and the trailing edge 9 is a rear edge in the rotational direction. The outer peripheral edge 11 is an edge portion that connects the radial outer end of the front edge 7 and the radial outer end of the rear edge 9.

  In addition, each blade 5 has a pressure surface 13 that is one surface that pushes the air flow during air rotation (when an air flow in the flow direction FD is generated) and a negative pressure surface 15 that is the other surface on the back side of the pressure surface 13. doing. In other words, the pressure surface 13 has the same circumferential direction component as the rotation direction RD of the propeller fan 1 during the rotation of the blower when the blade surface normal direction extending from the surface is decomposed into the axial direction component and the circumferential direction component. The suction surface 15 is the opposite surface, that is, when the blade surface normal direction extending from the surface is decomposed into an axial component and a circumferential component, the circumferential component is It is a surface that is opposite to the rotation direction RD of the propeller fan 1 during the air rotation.

  FIG. 2 is a plan view in which the propeller fan according to the first embodiment is projected onto a surface where the rotation axis RA is orthogonal. More specifically, the rotation axis RA extends so as to be orthogonal to the paper surface of FIG. 2, the propeller fan 1 is viewed from the upstream side in the air flow direction FD, and the suction surface 15 is shown on the front side of the paper surface of FIG. Has been.

  Next, the detail of the protrusion part provided in the wing | blade is demonstrated mainly based on FIGS. FIG. 3 shows the propeller fan according to the first embodiment in a cross section extending in the radial direction, and is a cross-sectional view taken along the line II in FIG. FIG. 4 is a perspective view showing a suction surface of one blade with respect to the propeller fan according to the first embodiment. FIG. 5 is a diagram for explaining the flow of the airflow in FIG.

  A protrusion 17 is provided on the suction surface 15 of the blade 5. The protrusion part 17 is extended in the circumferential direction in general. When viewed in the cross section of FIG. 3, the protruding portion 17 is a portion protruding away from the pressure surface 13 with respect to the reference line RL of the suction surface 15 of the blade 5. The reference line RL is a virtual curve that smoothly extends from the radially inner side to the radially outer side with respect to the negative pressure surface 15 in the same manner as the curve constituting the pressure surface 13. The protrusion 17 extends in the rotation direction, and the width (diameter dimension) of the protrusion 17 becomes narrower toward the front side in the rotation direction RD, and the protrusion 17 disappears without reaching the front edge 7. Further, the protruding portion 17 reaches the rear edge 9.

  Moreover, the protrusion part 17 has the vertex Pt as a site | part where the height H of the protrusion part 17 becomes the largest regarding each cross section of radial direction as an example is shown by FIG. The height H extends from the suction surface 15 toward the upstream side in the flow direction FD, and more precisely is a length in a direction perpendicular to the reference line RL.

  Furthermore, the protrusion 17 has a skirt portion on each of the radially inner side and the radially outer side with the apex Pt as a boundary. Each of the radially inner skirt portion 17a and the radially outer skirt portion 17b is a portion that decreases the height H as it is further away from the vertex Pt in the radial direction. The radially inner skirt portion 17a and the radially outer skirt portion 17b are respectively , Smoothly overlaps the reference line RL at a position sufficiently away from the vertex Pt. As one of the features of the first embodiment, the inclination of the radially inner skirt portion 17a is gentler than the inclination of the radially outer skirt portion 17b. That is, as shown in FIG. 3, the length along the reference line RL seen in the radial cross section of the entire protrusion 17 is defined as the protrusion width Pw, and the radial inner base 17a of the protrusion width Pw is included in the protrusion width Pw. When the width is the radially inner skirt width Wa and the width of the radially outer skirt width 17b is the radially outer skirt width Wb, the radially inner skirt width Wa> the radially outer skirt width Wb. . That is, the fact that the inclination of the radially inner skirt portion 17a is gentler than the inclination of the radially outer skirt portion 17b is that the decrease in the height H with respect to the distance away from the apex Pt (the dimension in the width direction) This is also because the reduction rate of the skirt portion 17a is smaller than the reduction rate of the radially outer skirt portion 17b.

  Further, the thickness of the wing 5 will be described. First, the negative pressure surface 15 has the protrusions 17 as described above, while the pressure surface 13 has no protrusions. For this reason, after the thickness of the blade 5 gradually decreases from the root portion of the blade 5 connected to the boss 3 toward the outer peripheral edge 11, and once increases toward the apex of the protrusion 17, the protrusion 17 It decreases again from the top to the outer peripheral edge 11.

  The apex Pt of the projecting portion 17 may be either a sharp corner or a moderately curved portion, but in FIG. 4, an example in which the apex Pt of the projecting portion 17 is a moderately curved portion. As shown, a portion where the vertices Pt are continuous is indicated by a broken line. Further, as an example, the vertex Pt is set at a position closer to the outer peripheral edge 11 which is the tip than the root portion connected to the boss 3 in the radial direction of the blade 5. The protruding portion 17 is provided at a position away from the outer peripheral edge 11, and a negative pressure surface 15 along the reference line RL exists between the protruding portion 17 and the outer peripheral edge 11. In other words, the dotted line 17b ′ indicating the outermost portion of the radially outer skirt portion 17b (that is, the dotted line 17b ′ indicating the boundary portion between the radially outer skirt portion 17b and the suction surface 15 along the reference line RL) is the outer peripheral edge 11. It exists in the position away from the inside in the radial direction.

  Next, the operation of the propeller fan according to the first embodiment having the above-described configuration will be described. The propeller fan 1 is attached to a well-known fan motor and rotates with the rotational force of the fan motor. When the propeller fan 1 rotates, airflow flows from the leading edge 7 of each wing and is discharged from the trailing edge 9. When the airflow flows along the wing 5, the direction of the airflow is changed by the inclination and warpage of the wing, and the static pressure rises by the change in momentum.

  More specifically, as shown in FIG. 5, a leakage vortex 19 (blade tip vortex) is generated in the outer peripheral edge 11 due to the flow leaking from the pressure surface 13 to the negative pressure surface 15 via the outer peripheral edge 11 of the blade 5. However, the leakage vortex 19 stays in a region near the outer peripheral edge 11 of the negative pressure surface 15 as shown by the oblique lines in the figure, thereby generating a low pressure portion. And the airflow which flows on the negative pressure surface 15 is attracted | sucked toward the vortex which is a low voltage | pressure, and becomes easy to flow to the outer periphery 11 side.

  In such a tendency, in the first embodiment, since the protruding portion 17 is provided on the suction surface 15, it flows on the boss side particularly due to the presence of the inclination of the radially inner skirt portion 17a of the protruding portion 17. The airflow 21a is suppressed from being sucked radially outward. Further, since the radially inner skirt portion 17a is provided in such a manner that the height gradually changes in the radial direction, the radially inner skirt portion 17a flows on the inner peripheral side with respect to a wide range of airflow 21a radially inward from the apex Pt of the protruding portion 17. Therefore, it is possible to control the blowing air direction as desired. On the other hand, on the radially outer side from the apex Pt of the projecting portion 17, the radially outer skirt portion 17b is limitedly arranged in a local range in view of the relationship with the radially inner skirt portion 17a. For this reason, the airflow 21b on the radially outer side can be made to flow to reach the rear edge without giving an effect of flowing to the outer peripheral edge 11 side as much as possible, and also toward the outer peripheral edge 11. It is possible to suppress the drift.

  In addition, as an advantage of providing a radially outer skirt portion 17b that is relatively limited to a local range when viewed from the outside in the radial direction, the thickness (mass) of the radially outer side is reduced, and at the time of rotation There exists a point which can maintain higher stability.

  Further, in the first embodiment, the flow of the suction surface is deviated outwardly in the radial direction only by the form of the suction surface in which the protrusion 17 is provided on the suction surface 15 independently of the shape of the outer peripheral edge of the blade. Can be suppressed. If the thickness of the blade is closer to the outer peripheral edge as shown in FIG. 6 while maintaining the wall thickness without providing the protrusion, the blade is warped upstream so that a force on the inner side in the radial direction is applied to the entire suction surface. The inclination of the pressure surface also becomes an inclination 23 inclined upstream from the boss toward the outer periphery, and there is a problem that the flow leaking from the pressure surface to the suction surface increases at the outer peripheral edge. On the other hand, in this Embodiment 1, since the flow of a suction surface is controlled only with the form of a suction surface, such a problem is not accompanied. In the first embodiment, as shown in FIG. 3, a region radially outward from the apex Pt of the projecting portion 17 (diameter larger than the radially outer skirt portion 17 b and the radially outer skirt width Wb). Both the negative pressure surface 15 and the pressure surface 13 are curved so as to be gradually located on the downstream side in the flow direction FD toward the outer peripheral edge 11. Due to the synergistic effect of the downstream warp of the radially outer portion with respect to both the suction surface 15 and the pressure surface 13 and the presence of the protrusion 17 described above, the flow of the radial direction on the suction surface is further reduced. Uniformity can be suppressed.

  As described above, according to the propeller fan according to the first embodiment, it is possible to reduce the deviation of the flow to the outside in the radial direction of the entire suction surface of the blade, and the blowout from the trailing edge The flow can be made uniform in the radial direction. Therefore, it is possible to reduce the occurrence of a local high-speed region, and as a result, it is possible to realize low noise and high efficiency.

Embodiment 2. FIG.
Next, a propeller fan according to Embodiment 2 of the present invention will be described with reference to FIGS. The second embodiment is the same as the first embodiment except for the part specifically described below. 7 is a plan view of the propeller fan according to the second embodiment. FIGS. 8A, 8B, and 8C are cross-sectional views taken along lines VIIIa, VIIIb, and VIIIc of FIG. 7, respectively. It is.

  The propeller fan 201 according to the second embodiment has blades 205 that increase in height H from the front to the rear in the rotation direction RD (from the upstream side to the downstream side). That is, for the three cross sections illustrated in FIG. 8, the height H1 <H2 <H3. In addition, although it is an example, also regarding the reference line, the inclination of the direction in which the outer peripheral edge 11 is located on the downstream side in the flow direction FD increases from the front to the rear in the rotation direction RD. That is, with respect to the three cross-sections illustrated in FIG. 8, the inclination of the direction in which the outer peripheral edge 11 is located on the downstream side in the flow direction FD is large in the order of the reference lines RL3, RL2, and RL1.

  According to the propeller fan according to the second embodiment configured as described above, the following advantages can be obtained in addition to the same advantages as those of the first embodiment. In general, since the differential pressure on both sides of the blade increases toward the trailing edge, leakage vortices generated in the vicinity of the outer peripheral edge 11 become stronger toward the trailing edge. Therefore, the airflow passing through the blade surface is also easily sucked outward in the radial direction toward the rear edge. Therefore, the height of the protruding portion increases from the front to the rear in the rotational direction RD, so that the airflow flowing on the rear edge side on the suction surface is particularly difficult to be sucked to the outer peripheral edge side, and the radial flow is efficiently performed. Can be suppressed. Note that the start point S of the protrusion is set to be 1/2 or earlier of the chord from the leading edge to the trailing edge (part closer to the leading edge than the trailing edge) with reference to the flow on the blade surface by the airflow analysis. Is more effective.

Embodiment 3 FIG.
Next, based on FIG.9 and FIG.10, the propeller fan which concerns on Embodiment 3 of this invention is demonstrated. The third embodiment is the same as the first embodiment except for the part specifically described below. FIG. 9 is a plan view of the propeller fan according to the third embodiment. 10A, 10B, and 10C are cross-sectional views taken along lines Xa, Xb, and Xc in FIG. 9, respectively.

  As can be seen from FIG. 10 (c) and FIG. 9, the protrusion 317 of the wing 305 in the propeller fan 301 according to the third embodiment disappears without reaching the trailing edge 9. That is, the rear edge 9 does not have the protruding portion 317 (the protruding portion non-forming portion 315a exists on the rear edge 9 side of the suction surface). In addition, as an aspect which makes the protrusion part 317 disappear without reaching the rear edge 9, for example, as shown in three cross sections shown in FIG. 10 and FIG. 9, the height H is from the front to the rear in the rotational direction RD. A portion that becomes smaller (from upstream to downstream) may be provided in a portion near the rear edge of the protruding portion 317. In relation to the illustration, the heights H4> H5 are satisfied for the two illustrated cross sections of FIG.

  According to the propeller fan according to the third embodiment configured as described above, the following advantages can be obtained in addition to the same advantages as those of the first embodiment. For example, when the projecting portion is formed up to the trailing edge, the trailing edge becomes thick, so that there is a possibility that a trailing flow will occur in the trailing edge blowing flow. On the other hand, in the third embodiment, no protrusion is formed on the trailing edge, and accordingly, an increase in the thickness in the vicinity of the trailing edge is avoided, and the possibility that a wake will occur is further reduced. This also makes it possible to further suppress the uneven flow.

  It should be noted that the third embodiment may be implemented in combination with the second embodiment described above. That is, in a wing having a protruding portion whose height increases from the front to the rear in the rotation direction, a protruding portion non-forming portion may be provided on the trailing edge side of the suction surface.

Embodiment 4 FIG.
Next, a propeller fan according to Embodiment 4 of the present invention will be described with reference to FIGS. The fourth embodiment is the same as the first embodiment except for the part specifically described below. FIG. 11 is a plan view of a propeller fan according to the fourth embodiment. 12A, 12B, and 12C are cross-sectional views taken along lines XIIa, XIIb, and XIIc in FIG. 11, respectively. FIG. 13 shows a propeller fan according to the fourth embodiment. FIG. 12C shows a cross section of FIG. 12C (cross section taken along line XIIc in FIG. 11) and a portion on the front side in the rotational direction of the cross section. FIG.

  As shown in FIGS. 11 to 13, the apex Pt of the protrusion 417 of the blade 405 in the propeller fan 401 according to the fourth embodiment is located closer to the boss 3 in the forward direction in the rotational direction RD. (It is formed so as to be located inside in the radial direction). That is, with respect to the three cross sections illustrated in FIG. 12, the radius R7 <R8 <R9 indicating the radial position of the apex Pt of the protrusion 417 is satisfied. Moreover, although it is only an example, the inclination of the reference line is large from the front to the rear in the rotation direction RD so that the outer peripheral edge is located on the downstream side in the flow direction FD.

  According to the propeller fan according to the fourth embodiment configured as described above, the following advantages can be obtained in addition to the same advantages as those of the first embodiment. That is, on the downstream side (rear edge side) where the pressure increase value by the propeller fan increases, the differential pressure between the pressure surface and the suction surface of the blade also increases, so the leakage vortex generated at the outer peripheral edge becomes stronger, and the suction force by the leakage vortex Will increase. For this reason, there exists a tendency for airflow to go to radial direction outside in the wide range of a wing | blade. In contrast to this tendency, in the fourth embodiment, the downstream side on the blade surface (the rear edge side) has a wide area that tends to flow outward in the radial direction due to the presence of the protruding portion on the radially outer side. A deterrent force directed inward in the radial direction can be applied to the airflow, and the blowout flow can be made uniform in the radial direction by this action.

  The fourth embodiment may be implemented in combination with the second or third embodiment described above.

Embodiment 5 FIG.
Next, a propeller fan according to Embodiment 5 of the present invention will be described. In addition, although this Embodiment 5 appears in drawing which shows Embodiment already demonstrated, regarding any of the said Embodiment 1-4, the protrusion part containing the vertex and the skirt part of both sides is a curved surface. It is configured. Thereby, in addition to the corresponding advantages of the first to fourth embodiments, the following advantages are also obtained. There is a possibility that a part of the airflow passing through the wing surface may get over the protrusion. In this regard, according to the fifth embodiment, when the airflow flows over the protruding portion, it is not necessary to generate a large separation at the protruding portion, and the loss can be prevented from increasing.

Embodiment 6 FIG.
Next, an outdoor unit (blower) according to Embodiment 6 of the present invention will be described. FIG. 14 is a perspective view of the outdoor unit (blower) according to the sixth embodiment when viewed from the outlet side, and FIG. 15 is a diagram for explaining the configuration of the outdoor unit from the upper surface side. . FIG. 16 shows a state where the fan grill is removed, and FIG. 17 is a diagram showing the internal configuration by further removing the front panel and the like.

  As shown in FIGS. 14-17, the outdoor unit main body (casing) 51 is configured as a housing having a pair of left and right side surfaces 51a, 51c, a front surface 51b, a back surface 51d, an upper surface 51e, and a bottom surface 51f. The side surface 51a and the back surface 51d have an opening for sucking air from the outside (see arrow A in FIG. 15). Moreover, in the front surface 51b, the blower outlet 53 as an opening part for blowing air outside (refer arrow A of FIG. 15) is formed in the front panel 52. As shown in FIG. Furthermore, the blower outlet 53 is covered with a fan grille 54, thereby preventing contact between an object or the like and the propeller fan 1 for safety.

  The propeller fan 1 is installed in the outdoor unit main body 51. The propeller fan 1 is the propeller fan according to any one of the first to fifth embodiments described above. The propeller fan 1 is connected to a fan motor (drive source) 61 on the back surface 51 d side via a rotary shaft 62, and is driven to rotate by the fan motor 61.

  The interior of the outdoor unit main body 51 is divided into a blower chamber 56 in which the propeller fan 1 is housed and installed, and a machine room 57 in which the compressor 64 and the like are installed, by a partition plate (wall body) 51g. . On the side surface 51a side and the back surface 51d side in the air blowing chamber 56, a heat exchanger 68 is provided so as to extend in a substantially L shape in plan view.

  A bell mouth 63 is arranged on the outer side in the radial direction of the propeller fan 1 arranged in the blower chamber 56. The bell mouth 63 is located outside the outer peripheral end of the blade 5 and has an annular shape along the rotation direction of the propeller fan 1. In addition, a partition plate 51g is located on one side of the bell mouth 63 (right side in FIG. 15), and on the other side (opposite direction) (left side in FIG. 15). A part of the heat exchanger 68 is located.

  The front end of the bell mouth 63 is connected to the front panel 52 of the outdoor unit so as to surround the outer periphery of the air outlet 53. The bell mouth 63 may be configured integrally with the front panel 52 or may be prepared as a separate body. With the bell mouth 63, a flow path between the suction side and the blow-out side of the bell mouth 63 is configured as an air path near the blow-out port 53. That is, the air passage near the blowout port 53 is separated from the other space in the blower chamber 56 by the bell mouth 63.

  The heat exchanger 68 provided on the suction side of the propeller fan 1 includes a plurality of fins arranged side by side so that the plate-like surfaces are parallel to each other, and a heat transfer tube penetrating each fin in the direction of arrangement. I have. A refrigerant circulating through the refrigerant circuit flows in the heat transfer tube. In the heat exchanger 68 of the present embodiment, the heat transfer tube extends in an L shape over the side surface 51a and the back surface 51d of the outdoor unit main body 51, and a plurality of heat transfer tubes meander while passing through the fins as shown in FIG. Configured to do. The heat exchanger 68 is connected to the compressor 64 via a pipe 65 and the like, and is further connected to an indoor heat exchanger, an expansion valve and the like (not shown) to constitute a refrigerant circuit of the air conditioner. A substrate box 66 is disposed in the machine room 57, and devices mounted in the outdoor unit are controlled by a control board 67 provided in the substrate box 66.

  In the sixth embodiment, the same advantages as those of the corresponding first to fifth embodiments can be obtained. In addition, by installing the propeller fan of Embodiments 1 to 5 above in the blower, the amount of blown air can be increased with high efficiency, and air that is a refrigeration cycle apparatus configured with a compressor, a heat exchanger, and the like By installing it in the outdoor unit of a harmony machine or the outdoor unit of a water heater, it is possible to increase the amount of air passing through the heat exchanger with low noise and high efficiency, thereby realizing low noise and energy saving of the equipment.

  In addition, although this Embodiment 6 demonstrated the outdoor unit of the air conditioning apparatus as an example of the outdoor unit including a blower, this invention is not limited to this, For example, implement as outdoor units, such as a water heater. Further, it can be widely applied as a device for blowing air, and can also be applied to devices and facilities other than outdoor units.

  Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

  For example, the protrusions are all formed in the same manner on each of the blades, but the present invention is not limited to this, and may be selectively formed on a plurality of blades constituting the propeller fan. In FIGS. 1, 2, and 14 to 17, priority is given to the clarity of the drawings, and the protrusions are not shown.

  1,201,301,401 Propeller fan, 3 bosses, 5,205,305,405, wing, 7 leading edge, 9 trailing edge, 11 outer periphery, 13 pressure surface, 15 suction surface, 17, 217, 317, 417 Projection part, 17a Radial inner base part, 17b Radial outer base part, 315a Projection part non-forming part.

Claims (7)

A propeller fan comprising a boss and a plurality of wings provided on the outer periphery of the boss,
The suction surface of at least one of the wings is provided with a protrusion,
The protrusion extends in the rotational direction at a position away from the outer peripheral edge of the wing,
The inclination of the radially inner skirt portion of the protrusion is gentler than the inclination of the radially outer skirt portion of the protrusion.
Propeller fan. The height of the protruding portion increases from the front to the rear in the rotational direction.
The propeller fan according to claim 1. On the trailing edge side of the suction surface of the wing, there is a protrusion non-forming portion.
The propeller fan according to claim 1 or 2. The apex of the protruding portion is located closer to the boss toward the front side in the rotation direction RD.
The propeller fan according to any one of claims 1 to 3. The protrusion is formed of a curved surface;
The propeller fan according to any one of claims 1 to 4. The propeller fan according to any one of claims 1 to 5,
A driving source for applying a driving force to the propeller fan;
A blower device comprising the propeller fan and a casing that houses the drive source. A heat exchanger,
The propeller fan according to any one of claims 1 to 5,
A driving source for applying a driving force to the propeller fan;
An outdoor unit comprising the propeller fan, the drive source, and a casing that houses the heat exchanger.

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