JP6723434B2 - Propeller fan - Google Patents

Description

The present invention relates to a propeller fan used in a refrigeration cycle device such as an air conditioner and a ventilation device.

Conventionally, noise reduction has been required for propeller fans (axial flow fans). Therefore, there has been proposed a propeller fan in which the noise is further reduced depending on the shape of the blade.
For example, Patent Document 1 discloses a propeller fan whose blade trailing edge has a sawtooth shape.

JP, 08-189497, A

The propeller fan described in Patent Document 1 enables the flow on the suction surface side and the flow surface on the pressure surface side of the blade to join little by little by forming the shape of the trailing edge of the blade into a sawtooth shape. Therefore, the velocity loss becomes small in the vicinity of the trailing edge, and as a result, the propeller fan disclosed in Patent Document 1 has a reduced velocity gradient and less turbulence than the conventional one. That is, Japanese Patent Application Laid-Open No. 2004-163242 is designed to reduce the turbulence of the blade rear flow, reduce noise, and improve fan efficiency by the shape of the trailing edge of the blade.

However, in the propeller fan described in Patent Document 1, by making the shape of the trailing edge of the blade into a sawtooth shape, it is possible to subdivide the vortex that is the sound source, but the sawtooth shape causes air flow. Not along. Therefore, the propeller fan described in Patent Document 1 has a problem that the static pressure decreases and a sufficient noise reduction effect cannot be obtained.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a propeller fan that adopts a blade shape in consideration of static pressure and achieves low noise.

The propeller fan according to the present invention has a boss that rotates about an axis, and a plurality of blades arranged on the outer peripheral portion of the boss, and the blade has a notch at the trailing edge, The notch has three or more triangular notched portions arranged from the inner peripheral edge to the outer peripheral edge of the blade in a top view, and the notched portion has a depth and a width from the inner peripheral edge of the blade to the outer periphery. The notch portion is configured so as to increase once toward the end and then decrease, and the notch portion has one first end portion formed on the leading edge side of the blade and two first end portions formed on the trailing edge side of the blade. a second end, and two sides connecting the second end portion and said first end portion has a, the two sides that have an arc shape protruding toward the outer peripheral end side, respectively ..

According to the propeller fan of the present invention, the notch having three or more notched portions is configured so that the depth and the width once increase from the inner peripheral edge to the outer peripheral edge of the blade and then decrease. Since it is formed on the trailing edge, it is possible to secure an increase in static pressure and realize low noise.

FIG. 3 is a perspective view schematically showing the configuration of the propeller fan according to Embodiment 1 of the present invention. It is an expansion perspective view which expands and shows one of the blades of the propeller fan which concerns on Embodiment 1 of this invention. FIG. 3 is a schematic view schematically showing an enlarged trailing edge portion of one blade of the propeller fan according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram for explaining the flow of air in the blades of the propeller fan according to Embodiment 1 of the present invention. It is a perspective view which shows roughly the structure of the propeller fan which concerns on Embodiment 2 of this invention. It is an expansion perspective view which expands and shows one of the blades of the propeller fan which concerns on Embodiment 3 of this invention. FIG. 9 is a schematic view showing an enlarged trailing edge portion of one blade of a propeller fan according to a third embodiment of the present invention. It is the schematic which looked at a part of propeller fan which concerns on Embodiment 4 of this invention from the top view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings including FIG. 1, the relationship of the sizes of the respective constituent members may be different from the actual one. Further, in the following drawings including FIG. 1, the same reference numerals are the same or equivalent, and this is common to all the texts of the specification. Furthermore, the forms of the constituent elements shown in the entire text of the specification are merely examples, and the present invention is not limited to these descriptions.

Embodiment 1.
FIG. 1 is a perspective view schematically showing a configuration of a propeller fan 100A according to the first embodiment of the present invention. FIG. 2 is an enlarged perspective view showing one of the blades 2A of the propeller fan 100A in an enlarged manner. FIG. 3 is an enlarged schematic view of a trailing edge 24 portion of one blade 2A of the propeller fan 100A. FIG. 4 is a schematic diagram for explaining the flow of air in the blade 2A of the propeller fan 100A. The propeller fan 100A will be described with reference to FIGS.

1 shows a propeller fan 100A having five blades 2A. However, the number of blades 2A is not particularly limited. Further, the cutout 25A is set for each blade regardless of the number of blades 2A, and the effect obtained by implementing the propeller fan 100A according to the first embodiment of the present invention can be obtained for each blade. Further, in FIG. 3, the cutout portion 30c forming a part of the cutout 25A is shown as a typical example.

The propeller fan 100A includes a boss 1 that rotates about an axis RC, and a plurality of blades 2A that are arranged on the outer peripheral portion of the boss 1. The blade 2A is surrounded by an inner peripheral edge 21, an outer peripheral edge 22, a front edge 23, and a rear edge 24. Further, a cutout 25A is provided at the trailing edge 24 of the blade 2A. The notch 25A is formed by arranging a plurality of notch portions 30 each having a triangular shape in a top view, from the inner peripheral end 21 to the outer peripheral end 22 of the blade 2A.

Although FIG. 1 and FIG. 2 show an example in which the notch 25A is formed by the five notch portions 30, the number of the notch portions 30 may be three or more, and the number is not particularly limited. Further, in FIG. 2, the cutout portion 30a, the cutout portion 30b, the cutout portion 30c, the cutout portion 30d, and the cutout portion 30e are illustrated from the left side of the drawing, that is, from the inner peripheral end 32 side. The triangular shape when viewed from above means that the propeller fan 100A has a triangular shape when viewed from the axial direction (upper side of the drawing).

The notch 25A will be described in detail.
Each of the cutout portions 30 has a first end portion 25a and a second end portion 25b. The first end portion 25a is one apex portion formed on the front edge 23 side of the cutout portion 30. That is, each of the cutout portions 30 has one first end portion 25a. The second end portion 25b is two apex portions formed on the rear edge 24 side of the cutout portion 30. That is, each of the second end portions 25b has two cutout portions 30.

However, the second end portion 25b on the outer peripheral end 22 side of the cutout portion 30a is common to the second end portion 25b on the inner peripheral end 21 side of the adjacent cutout portion 30b. Similarly, the second end portion 25b of the cutout portion 30b on the outer peripheral end 22 side is common to the second end portion 25b of the adjacent cutout portion 30c on the inner peripheral end 21 side. Similarly, the second end portion 25b on the outer peripheral end 22 side of the cutout portion 30c is common to the second end portion 25b on the inner peripheral end 21 side of the adjacent cutout portion 30d. Similarly, the second end 25b on the outer peripheral end 22 side of the cutout portion 30d is common to the second end 25b on the inner peripheral end 21 side of the adjacent cutout portion 30e. The cutout portion 30a has a second end portion 25b on the inner peripheral end 21 side of the cutout portion 30a, and the cutout portion 30e has a second end portion 25b on the outer peripheral end 22 side of the cutout portion 30e.

Further, each of the cutout portions 30 has two sides 253 that connect the first end portion 25a and the second end portion 25b. The side 253 on the inner peripheral end 21 side, which is one of the two sides, is defined as the inner periphery 253i, and the side 253 on the outer peripheral end 22 side, which is one of the two sides, is defined as the outer periphery 253o. Each of the cutout portions 30 is a space portion from the two second end portions 25b to the first end portion 25a.

Here, a straight line connecting the adjacent second end portions 25b is L1, a perpendicular line passing through the first end portion 25a of each cutout portion 30 is L2 with respect to L1, and an intersection point of L1 and L2 is P. At this time, the distance between P and the first end portion 25a is defined as the depth 251 of the cutout portion 30, and the distance between the adjacent second end portions 25b is defined as the width 252 of the cutout portion 30.

The depths 251 of the cutout portions 30 and the widths 252 of the cutout portions 30 are formed such that each of the cutout portions 30 increases once from the inner peripheral end 21 side to the outer peripheral end 22 side and then decreases. That is, as shown in FIG. 2, the notch portion 30 is sequentially enlarged from the notch portion 30a to the notch portion 30c, and the notch portion 30 is successively decreased from the notch portion 30c to the notch portion 30e, and the notch portion 30c has the largest size. It has become. The depth 251 of the cutout portion 30c and the width 252 of the cutout portion 30c are the maximum.

The two sides 253 of the cutout portion 30 each have an arc shape that is convex toward the outer peripheral end 22 side. Then, the radius of curvature of the arc of the inner periphery 253i is Ri, and the radius of curvature of the arc of the outer periphery 253o is Ro. At this time, the inner periphery 253i and the outer periphery 253o are configured to satisfy the relationship of Ri<Ro.

Next, based on FIG. 4, the effect of the propeller fan 100A will be described together with the operation of the propeller fan 100A. In FIG. 4, the flow of air in the blade 2A is represented by an arrow.

The operation of the propeller fan 100A will be described.
When a motor (not shown) attached to the boss 1 is rotationally driven, the three-dimensional solid blade 2A shown in FIG. 1 rotates together with the boss 1 in a direction indicated by an arrow A around the axis RC. An airflow (blast flow) is generated by the rotation of the blade 2A. The upstream side of the blade 2A serves as a suction surface and the downstream side serves as a pressure surface.

The effect of the propeller fan 100A will be described.
In the propeller fan 100A, as in a general propeller fan, the air flow on the outer peripheral end 22 side on the surface of the blade 2A moves toward the outer peripheral end 22 side by the centrifugal force in the vicinity of the trailing edge 24 as indicated by an arrow ST1. It becomes a biased flow.
Further, in the propeller fan 100A, the air flow on the inner peripheral end 21 side on the surface of the blade 2A becomes a flow along the inner peripheral end 21, as indicated by an arrow ST2, as in a general propeller fan.

By the way, in the propeller fan 100A, a notch 25A is formed in the trailing edge 24 of the blade 2A. Therefore, in the propeller fan 100A, air flows in the outer periphery 253o of the cutout portion 30 as shown by an arrow ST3. That is, in the outer periphery 253o of the cutout portion 30, the air flow is originally substantially parallel to the arrow ST1. Therefore, by making Ro larger than Ri, the air flow is long along the blade surface as shown by the arrow ST3. It will be.

Further, in the propeller fan 100A, air flows in the inner periphery 253i of the cutout portion 30 as indicated by an arrow ST4. That is, in the inner periphery 253i of the cutout portion 30, the air flow is originally substantially orthogonal to the arrow ST1. Therefore, by making Ri smaller than Ro, the air flow extends along the inner periphery 253i as shown by the arrow ST4. And can be bent smoothly. Therefore, if Ri is larger than Ro, the air flow cannot be sharply bent and cannot be along the blade surface, but in the propeller fan 100A, by making Ri smaller than Ro, the inner periphery of the cutout portion 30 can be reduced. Also in 253i, it becomes possible to make the air flow follow the blade surface for a long time.

As described above, according to the propeller fan 100A, by forming the notch 25A in the trailing edge 24 of the blade 2A, it is possible to lengthen the air flow near the trailing edge 24 along the blade surface, The static pressure rise can be secured.

Further, in the velocity distribution of the air flow shown by the arrow ST1, the velocity temporarily increases from the inner peripheral end 21 side toward the outer peripheral end 22 side due to the increased centrifugal force action, and at the outer peripheral end 22 end the arrow V indicates. The indicated leak flow occurs. As a result, the work of the blade 2A is reduced, and the speed is reduced. The higher the speed, the larger the vortex that becomes the sound source. In order to subdivide this, it is necessary to increase the depth 251 of the cutout portion 30 and the width 252 of the cutout portion 30.

From these things, the propeller fan 100A is configured such that the depth 251 of the cutout portion 30 and the width 252 of the cutout portion are first increased from the inner peripheral end 21 side to the outer peripheral end 22 side and then reduced. By doing so, the velocity distribution of the blade surface, the depth 251 of the cutout portion 30 and the width 252 of the cutout portion are more appropriately combined, and the effect of ensuring a rise in static pressure is sufficiently exerted.
Therefore, according to the propeller fan 100, by forming the notch 25A in the trailing edge 24 of the blade 2A, the effect of subdividing the vortex that is the sound source can be sufficiently exerted without lowering the static pressure, thus reducing noise. Can be realized.

Embodiment 2.
FIG. 5 is a perspective view schematically showing a configuration of propeller fan 100B according to the second embodiment of the present invention. The propeller fan 100B will be described with reference to FIG.
In the second embodiment, differences from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be designated by the same reference numerals and the description thereof will be omitted. Further, FIG. 5 illustrates a propeller fan 100B having five blades 2B. However, the number of blades 2B is not particularly limited. Further, the cutout 25B is set for each blade regardless of the number of blades 2B, and the effect obtained by implementing the propeller fan 100B according to the second embodiment of the present invention can be obtained for each blade.

The propeller fan 100B has a boss 1 that rotates about an axis RC, and a plurality of blades 2B that are arranged on the outer peripheral portion of the boss 1. The blade 2B is surrounded by an inner peripheral edge 21, an outer peripheral edge 22, a front edge 23, and a rear edge 24. Further, a cutout 25B is provided at the trailing edge 24 of the blade 2B. Similar to the cutout 25A described in the first embodiment, the cutout 25B is formed by arranging a plurality of cutout portions 30 each having a triangular shape in a top view from the inner peripheral end 21 to the outer peripheral end 22 of the blade 2B. In FIG. 5, the state in which the notch 25B is formed by the five notch portions 30 is shown as an example, but the number of the notch portions 30 may be three or more. The structure of the cutout portion 30 is as described in the first embodiment.

The notch 25B will be described in detail.
The radial position of the second end portion 25b located on the inner peripheral end 21 side of the cutout portion 30a with respect to the axial center RC is Rki, and the radius of the second end portion 25b located on the outer peripheral end 22 side of the cutout portion 30e with respect to the axial center RC. The position is Rko, and the radial position of the outer peripheral end 22 of the blade 2B with respect to the axis RC is Rf. The notch 25B is formed at a position that satisfies the relationship of Rki/Rf>0.65 and Rko/Rf<0.95. That is, when Rki/Rf and Rko/Rf are the radius ratios, the notch 25B is provided in the radius ratio range of 0.65 to 0.95.

Further speaking, the value defined by the second end portion 25b located closest to the inner peripheral end 21 side of the cutout portion 30 forming the cutout 25B and the outermost outer peripheral end 22 of the blade 2 is set to the minimum value, and the cutout portion The range of the radius ratio is determined with the maximum value being the value determined by the second end portion 25b located on the outermost peripheral edge 22 side of the cutout portion 30 that constitutes 25B and the outermost peripheral edge 22 of the blade 2. It

The effect of the propeller fan 100B will be described.
When the notch 25B is formed in a region having a radius ratio of 0.65 or less, the centrifugal force acting on the air flow is small, and the influence of the air flow biased toward the outer peripheral end 22 side (see arrow ST1 shown in FIG. 4) is small. Will be things.
Further, when the notch 25B is formed in the region having the radius ratio of 0.95 or more, the action of pushing back the air flow to the inner peripheral end 21 side due to the influence of the leakage flow (see arrow V shown in FIG. 4) works, and The air flow biased toward the end 22 side (see arrow ST1 shown in FIG. 4) is less likely to occur.

That is, in the propeller fan 100B, the notch 25B is provided in the range of the radius ratio of 0.65 to 0.95, which is the region where the air flow biased toward the outer peripheral end 22 side by the centrifugal force is most prominent. Therefore, according to the propeller fan 100B, by forming the notch 25B in the optimum range of the trailing edge 24 of the blade 2B, it becomes possible to lengthen the air flow near the trailing edge 24 along the blade surface. The static pressure increase can be secured more effectively. Therefore, according to the propeller fan 100B, the effect of subdividing the vortex serving as the sound source can be sufficiently exerted without lowering the static pressure, so that noise reduction can be realized.

Embodiment 3.
FIG. 6 is an enlarged perspective view showing one of blades 2C of propeller fan 100C according to Embodiment 3 of the present invention in an enlarged manner. FIG. 7 is an enlarged schematic view of a trailing edge 24 portion of one blade 2C of the propeller fan 100C. The propeller fan 100C will be described with reference to FIGS. 6 and 7.

Note that the third embodiment will be described focusing on the differences from the first and second embodiments, and the same parts as those of the first and second embodiments will be assigned the same reference numerals and description thereof will be omitted. In addition, FIG. 6 illustrates one of the blades 2C that configure the propeller fan 100C. The propeller fan 100C has, for example, five blades 2C, but the number of blades 2C is not particularly limited. Further, the notch 25C is set for each blade regardless of the number of blades 2C, and the effect obtained by implementing the propeller fan 100C according to Embodiment 3 of the present invention can be obtained for each blade.

The propeller fan 100C has a boss 1 that rotates about an axis RC, and a plurality of blades 2C that are arranged on the outer peripheral portion of the boss 1. The blade 2C is surrounded by an inner peripheral edge 21, an outer peripheral edge 22, a front edge 23, and a rear edge 24. Further, a notch 25C is provided at the trailing edge 24 of the blade 2C. Similar to the cutout 25A described in the first embodiment, the cutout 25C is formed by arranging a plurality of cutout portions 30 each having a triangular shape in a top view from the inner peripheral end 21 to the outer peripheral end 22 of the blade 2C. Although FIG. 6 shows an example in which the cutouts 25C are formed by the five cutouts 30, the cutouts 30 may be three or more. The structure of the cutout portion 30 is as described in the first embodiment.

The notch 25C will be described in detail.
In the first embodiment, the depth 251 of the notch portion 30 and the width 252 of the notch portion 30 are formed such that the depths 251 and 252 of the notch portion 30 increase once from the inner peripheral end 21 side to the outer peripheral end 22 side, and then decrease. However, the radius of curvature Ri of the arc of the inner periphery 253i of each cutout portion 30 is not described.
Therefore, in the propeller fan 100C, in addition to the contents of the first embodiment, the size of the radius of curvature Ri of the arc of the inner periphery 253i of each cutout portion 30 is taken into consideration.

Specifically, the radius of curvature Ri of the arc of the inner periphery 253i of each cutout portion 30 becomes smaller in a region where the depth 251 of the cutout portion 30 and the width 252 of the cutout portion 30 are larger than the reference value. The depth 251 of the portion 30 and the width 252 of the cutout portion 30 are set to be large in a small region. The reference value is the average value of the depth 251 and the width 252 of each cutout portion 30, or the maximum depth 251 of the cutout portion 30 and the width 252 of the cutout portion 30 and the minimum cutout portion. The depth 251 of the groove 30 and the width 252 of the cutout portion 30 can be appropriately set as an intermediate value.

Here, of the depth 251 of the cutout portion 30, the depth 251a, the depth 251b, and the depth 251c are set in order from the largest depth, for example, 251b=0.9×251a, for example, 251c=0.9×251b. And Further, the radius of curvature Ri of the arc of the inner periphery 253i corresponds to the depth 251a, the depth 251b, and the depth 251c, and is Ria, Rib, and Ric, respectively. At this time, the relationship of Rib=0.95×Ria and Ric=0.95×Rib is satisfied.

In FIG. 7, the relationship between the cutout portion 30c, the cutout portion 30d, and the cutout portion 30e is illustrated as an example. The cutout portion 30a can be formed, for example, with the same depth 251 and the same width 252 as the cutout portion 30e. Similarly, the cutout portion 30b can be formed, for example, with the same depth 251 and the same width 252 as the cutout portion 30d. However, it is not essential to form the cutout portions 30 at symmetrical positions with the same depth 251 and the same width 252. The symmetrical position is a position where the depth 251 of the cutout portion 30 and the width 252 of the cutout portion 30 once increase from the inner peripheral end 21 side to the outer peripheral end 22 side and then decrease. Further, the depth 251 and the width 252 of all the cutout portions 30 may be different. The width 252 of the cutout portion 30 has the same structure.

The effect of the propeller fan 100C will be described.
As described in the first embodiment, making the inner periphery 253i of the cutout portion 30 into an arc shape increases the static pressure by smoothly bending the air flow along the inner periphery 253i and extending it along the blade surface for a long time. Is secured (see arrow ST4 shown in FIG. 4).
In addition, in the propeller fan 100C, the radius of curvature Ri of the arc of the inner periphery 253i is made smaller in a region where the velocity of the air flow is higher. As a result, according to the propeller fan 100C, it is possible to overcome the inertia of the fast air flow and bend the air flow along the inner periphery 253i, and to further increase the static pressure. Therefore, according to the propeller fan 100C, the effect of subdividing the vortex that is the sound source can be sufficiently exerted without lowering the static pressure, so that noise reduction can be realized.

Fourth Embodiment
FIG. 8 is a schematic view of a part of propeller fan 100D according to the fourth embodiment of the present invention when viewed from above. The propeller fan 100D will be described with reference to FIG.
In addition, in the fourth embodiment, differences from the first to third embodiments will be mainly described, and the same parts as those of the first to third embodiments will be denoted by the same reference numerals and description thereof will be omitted. In addition, FIG. 8 illustrates one of the blades 2D included in the propeller fan 100D. The propeller fan 100D has, for example, five blades 2D, but the number of blades 2D is not particularly limited. The cutouts 25D are set for each blade regardless of the number of blades 2D, and the effect obtained by implementing the propeller fan 100C according to the fourth embodiment of the present invention can be obtained for each blade.

The propeller fan 100D has a boss 1 that rotates about an axis RC, and a plurality of blades 2D that are arranged on the outer peripheral portion of the boss 1. The blade 2D is surrounded by an inner peripheral edge 21, an outer peripheral edge 22, a front edge 23, and a rear edge 24. Further, a cutout 25D is provided at the trailing edge 24 of the blade 2D. Similar to the cutout 25A described in the first embodiment, the cutout 25D is formed by arranging a plurality of cutout portions 30 each having a triangular shape in a top view from the inner peripheral end 21 to the outer peripheral end 22 of the blade 2D. In FIG. 8, the state in which the notch 25D is formed by the five notch portions 30 is shown as an example, but the number of notch portions 30 may be three or more. The structure of the cutout portion 30 is as described in the first embodiment.

The cutout 25D will be described in detail.
As shown in FIG. 8, an arc passing through the first end 25a of the cutout portion 30a with the axis RC as the center is defined as an arc X1. Further, an arc passing through the first end 25a of the cutout portion 30b about the axis RC is defined as an arc X2. Further, an arc passing through the first end portion 25a of the cutout portion 30c with the axis RC as the center is defined as an arc X3. Further, an arc passing through the first end 25a of the cutout portion 30d with the axis RC as the center is defined as an arc X4. Further, an arc passing through the first end portion 25a of the cutout portion 30e with the axis RC as the center is defined as an arc X5.

At this time, the second end portion 25b located on the inner peripheral end 21 side of the cutout portion 30a is located on the outer peripheral end 22 side with respect to the arc X1. Similarly, the second end portion 25b located on the inner peripheral end 21 side of the cutout portion 30b is located on the outer peripheral end 22 side with respect to the arc X2. Similarly, the second end 25b located on the inner peripheral end 21 side of the cutout portion 30c is located on the outer peripheral end 22 side with respect to the arc X3. Similarly, the second end portion 25b located on the inner peripheral end 21 side of the cutout portion 30d is located on the outer peripheral end 22 side with respect to the arc X4. Similarly, the second end 25b located on the inner peripheral end 21 side of the cutout portion 30e is located on the outer peripheral end 22 side with respect to the arc X5.

That is, in the propeller fan 100D, the radial position of the second end 25b with respect to the axial center RC on the inner periphery 253i of each of the plurality of cutout portions 30 is connected to the second end 25b at the inner periphery 253i. The notch 25D is formed so as to be located on the outer peripheral side with respect to the radial position of the one end 25a with respect to the axis RC.

The effect of the propeller fan 100D will be described.
As described in the first embodiment, making the inner periphery 253i of the cutout portion 30 into an arc shape increases the static pressure by smoothly bending the air flow along the inner periphery 253i and extending it along the blade surface for a long time. Is secured (see arrow ST4 shown in FIG. 4).
In addition, in the propeller fan 100D, since the first end portion 25a and the second end portion 25b on the inner periphery 253i are set in relation to the arc X passing through the first end portion 25a, the air flow is bent too much. The flow of air can be bent appropriately without causing bending loss due to. As a result, according to the propeller fan 100D, the static pressure can be further increased. Therefore, according to the propeller fan 100D, the effect of subdividing the vortex that is the sound source can be sufficiently exerted without lowering the static pressure, and thus noise reduction can be realized.

The propeller fan according to the present invention has been described above divided into four embodiments, but the present invention is not limited to these, and various modifications and changes can be made without departing from the scope and spirit of the present invention. Further, the propeller fan may be configured by appropriately combining the contents described in each embodiment.

The propeller fan described in each of the embodiments is an example of a refrigeration cycle device such as an air conditioner (for example, a refrigerating device, a room air conditioner, a package air conditioner, a multi air conditioner for buildings), a heat pump water heater, a showcase, or the like. It is used in the cooling unit that constitutes the unit. Specifically, it can be adopted as a blower that supplies air to a heat exchanger mounted on a cooling unit.

1 boss, 2A wing, 2B wing, 2C wing, 2D wing, 21 inner peripheral end, 22 outer peripheral end, 23 leading edge, 24 trailing edge, 25A notch, 25B notch, 25C notch, 25D notch, 25a first end, 25b 2nd end part, 30 notch part, 30a notch part, 30b notch part, 30c notch part, 30d notch part, 30e notch part, 100A propeller fan, 100B propeller fan, 100C propeller fan, 100D propeller fan, 251 notch part Depth, 252 Notch width, 253 sides, 253i inner periphery, 253o outer periphery.

Claims (5)

A boss that rotates around the axis,
A plurality of blades arranged on the outer peripheral portion of the boss,
The wings are
Has a notch on the rear edge,
The notch is
And three or more triangular cutouts in a top view arranged from the inner peripheral edge to the outer peripheral edge of the blade,
The cutout portion is
The depth and width are configured to increase once from the inner peripheral edge to the outer peripheral edge of the blade and then decrease .
The cutout portion is
One first end formed on the leading edge side of the wing;
Two second end portions formed on the trailing edge side of the blade,
Two sides connecting the first end portion and the second end portion,
A propeller fan in which each of the two sides has an arc shape that is convex toward the outer peripheral edge side . The cutout portion is
The two one is near the radius of curvature among which sides, propeller fan according to claim 1, which is made smaller than the radius of curvature of the outer periphery, which is one of the two sides. The radial position with respect to the axis of the second end located on the innermost end side is Rki,
The radial position with respect to the axis of the second end located on the outermost peripheral side is Rko,
When the radial position with respect to the axial center of the outer peripheral end of the blade is Rf,
The notch is
Rki / Rf> 0.65 and, propeller fan according to claim 1 or 2 is formed at a position satisfying the relation of Rko / Rf <0.95. The notch is
The radius of curvature of the inner periphery of the cutout portion becomes large in a region where the depth and width of the cutout portion is smaller than a reference value so that it becomes smaller in a region where the depth and width of the cutout portion is larger than a reference value. propeller fan according to any one of claims 1 to 3 is configured. The notch is
The radial position of the second end portion with respect to the axial center on the inner periphery of the cutout portion is closer to the outer peripheral end than the radial position of the first end portion connected to the second end portion with the inner periphery with respect to the axial center. propeller fan according to any one of claims 1 to 4, which is located.

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