TW202007870A - Propeller fan and air blowing device - Google Patents

Abstract

In the present invention, the air volume from an inner portion in the radial direction is increased. A propeller fan (10A) includes a boss hub part (11) and blades (12A). Each blade (12A) includes, on a positive pressure surface thereof, a first rib group consisting of at least one first rib (19A) that extends from a front edge (13) towards a back edge (14). The center position, in the blade (12A) radial direction, of the first rib group is a position closer to an inner circumferential end of the blade (12A) than an outer circumferential end thereof.

Description

Propeller fan and air supply device

The present invention relates to a propeller fan used in a transmission device such as an electric fan and a circulator, and an air blowing device including the same.

Propeller fans can efficiently deliver large amounts of air, and have been used as fans for ventilation fans, electric fans, air-conditioning outdoor units, and air cooling devices. The conventional propeller fan mainly sends the wind with a high wind speed in the axial direction as it goes outward in the radial direction.

For example, a propeller fan used in an electric fan sends out soft wind to the user as a first function, and as a second function, such as when it is used in conjunction with an air conditioner in summer, in order to cool the wind from the air conditioner Stir and reach the room, seeking to extend the reach of the wind.

Among them, for the first function, in recent years, by increasing the number of blades of the propeller fan, the pressure fluctuation of the wind is reduced, and the function is improved. In addition, for the second function, a fixed wing is provided on the downstream side of the propeller fan, and an additional casing is added, thereby improving the function. However, since the addition of the housing and components in this way increases the disadvantages of the cost, size, and material cost of the air blowing device, it becomes difficult to adopt.

Here, in the fan described in Patent Document 1, a plurality of rib-like protrusions are provided along the flow direction of the blower fluid on the blades, the inner surface of the casing, and the like. This suppresses the disturbance of the air flow on the negative pressure surface and the pressure fluctuation on the negative pressure surface. The sound pressure emitted from the negative pressure surface of the blade is caused by the pressure fluctuation of the negative pressure surface of the blade. Therefore, the reduction of the disturbance of the air flow on the negative pressure surface is linked to the reduction of the sound emitted.

Further, in the propeller fan described in Patent Document 2, serrations are formed on the front edge portion of the propeller fan, and protruding ribs are formed so as to extend from the serrated valley portion toward the rear edge portion. Thus, in the propeller fan described above, the direction of the air flow flowing on the negative pressure surface can be concentrated, and the detachment of the main flow on the negative pressure surface can be suppressed.

Patent Document 1: Japanese Patent Laid-Open No. 7-279893. Patent Document 2: Japanese Patent Laid-Open No. 2016-65536.

In the conventional propeller fan, the amount of air flow from the radially outer part of the blade is large, but the amount of air flow from the radially inner part is small. That is, the inner portion in the radial direction contributes little to the increase in the air volume of the propeller fan. Therefore, if the propeller fan can increase the air volume from the radially inner portion, the air volume as the entire propeller fan can be increased. On the other hand, the configurations of Patent Documents 1 and 2 do not contribute to the increase in the air volume from the radially inner portion.

Therefore, an object of one aspect of the present invention is to provide a propeller fan and an air blowing device that can increase the air volume from the radially inner portion.

In order to solve the above-mentioned problems, the propeller fan according to an aspect of the present invention includes: a rotating shaft portion; a wing; and the wing includes: a front edge portion formed from the rotating shaft portion outward, respectively, on the side of the rotating direction; a rear edge Part, on the side opposite to the direction of rotation; and a peripheral edge part, connecting the front end part of the front edge part and the front end part of the rear edge part and formed in the circumferential direction; and the wing includes a first rib group on the positive pressure surface , The first rib group includes one or more first ribs extending from the upstream side, that is, the front edge portion side, to the downstream side, that is, the rear edge portion side; the radial center position of the wing of the first rib group becomes and The outer end of the wing is closer to the inner end than the inner end.

According to an aspect of the present invention, the propeller fan can increase the air volume from the radially inner portion.

[First embodiment] (Structure of electric fan 1) Hereinafter, embodiments of the present invention will be described below based on the drawings. FIG. 1 is a partially exploded side view of an electric fan including a propeller fan of this embodiment.

As shown in FIG. 1, the electric fan (air supply device) 1 includes a front guard 2, a rear guard 3, a body portion 4, a stand 5, and a propeller fan 10A.

The main body 4 is supported by the bracket 5 and houses a drive motor (not shown) inside. In front of the main body 4, the rotating shaft 4a of the drive motor is exposed and positioned, and here the rotating shaft 4a will use a nut 6 as a boss hub 11 (see FIG. 2 etc.) of the rotating shaft of the propeller fan 10A fixed.

The front stop 2 and the rear stop 3 are provided so as to surround the propeller fan 10A fixed to the main body 4. In detail, the rear stop 3 is fixed to the main body 4 so as to cover the back side (negative pressure surface side) of the propeller fan 10A, and the front stop 2 covers the front side (positive pressure surface side) of the propeller fan 10A. Fixed in the rear block 3.

The bracket 5 is provided for placing the electric fan 1 on the ground or the like, and supports the main body 4. In addition, an operation part (not shown) for turning ON/OFF of the electric fan 1, switching the operating state, etc. is provided at a specific position of the bracket 5.

In addition, the body portion 4 and the bracket 5 are preferably connected in such a manner that the electric fan 1 has a swing head function, and the body portion 4 can swing in a horizontal plane and a vertical plane.

In addition, the bracket 5 is preferably configured so that the electric fan 1 has a height adjustment function and can be stretched freely in the vertical direction.

(Outline of propeller fan 10A) FIG. 2 is a perspective view of the propeller fan 10A viewed from the front. FIG. 3 is a perspective view of the propeller fan 10A viewed from the back side. FIG. 4 is a front view of propeller fan 10A. FIG. 5 is a rear view of propeller fan 10A.

As shown in FIGS. 2 to 5, the propeller fan 10A includes the hub portion 11 described above and a plurality of wings 12A. The hub portion 11 is a rotating shaft portion of the propeller fan 10A, and has a bottomed and substantially cylindrical shape. The plurality of wings 12A are each in a plate shape smoothly curved, and are formed in a state of protruding outward from the outer circumferential surface of the hub portion 11 toward the radial direction so as to be aligned along the circumferential direction of the hub portion 11.

In the present embodiment, the propeller fan 10A is a seven-winger including seven wings 12A. The propeller fan 10A is made of, for example, synthetic resin such as AS (acrylonitrile-styrene) resin, and the hub portion 11 is formed integrally with the seven wings 12A, for example, by a resin molded product by injection molding. The propeller fan 10A can also be formed by sheet metal or the like.

The propeller fan 10A is driven by the above-described drive motor, and rotates in the direction of arrow A shown in FIG. 2 using the virtual center axis 25 of the hub portion 11 as the center of rotation. In the propeller fan 10A, as the plurality of blades 12A rotate, air flows from the rear side of the propeller fan 10A, that is, the suction side, to the front side of the propeller fan 10A, that is, the discharge side, and toward the front of the electric fan 1 Air supply.

In the propeller fan 10A, a plurality of blades 12A are arranged at regular intervals so as to be separated from each other in the rotation direction, and each of the plurality of blades 12A has the same shape. Therefore, when an arbitrary wing 12A is rotated about the center axis 25 as the center of rotation, the shape of the wing 12A matches the shape of the other wing 12A.

(Structure of Wing 12A) Next, the configuration of the blade 12A of the propeller fan 10A will be described in detail. Since a plurality of (7) wings 12A have the same configuration, here, the configuration of one wing 12A will be described.

6 is a cross-sectional view taken along line B-B in FIG. 5. 7 is a cross-sectional view taken along C-C in FIG. 5. FIG. 8 is an enlarged view of the section of FIG. 7. 9 is an explanatory view showing the shape of the first rib 19A included in the wing 12A.

The wing 12A of the propeller fan 10A, as shown in FIGS. 2 to 5, includes a front edge portion 13, a rear edge portion 14, a peripheral edge portion 15, and a tail-shaped protrusion 22, and the width becomes wider toward the outside in the radial direction . As the propeller fan 10A rotates, the airflow flows from the front edge portion 13 toward the rear edge portion 14 in the wing 12A. Therefore, hereinafter, the front edge portion 13 side will be referred to as the upstream side, and the rear edge portion 14 side will be referred to as the downstream side.

The front edge portion 13 is an end edge portion located on the side in the rotation direction of the blade 12A, and is curved in a concave shape so that the middle portion in the radial direction recedes toward the side opposite to the rotation direction. The rear edge portion 14 is an end edge portion located on the side opposite to the rotation direction, and is curved convexly so that the middle portion in the radial direction recedes toward the side opposite to the rotation direction. The peripheral edge portion 15 is an end edge portion formed in the circumferential direction that connects the front end portion of the front edge portion 13 and the front end portion of the rear edge portion 14. The tail-shaped protruding portion 22 is a shape extending in a tongue shape at a position radially outward of the rear edge portion 14, and protrudes rearward than the rear edge portion 14.

The blade 12A is curved in the axial direction so that the front side becomes concave and the back side becomes convex. Therefore, the front surface of the wing 12A is the positive pressure surface 16 and the back surface is the negative pressure surface 17.

(Bending part 18) As shown in FIG. 6, the wing 12A includes a bent portion 18 near the leading edge portion 13. The bent portion 18 is a fold 18 a that becomes convex on the positive pressure surface 16 side and a portion from the fold 18 a toward the front edge portion 13 side, and is formed along the front edge portion 13. In addition, the bent portion 18 is not limited to a structure formed to span a length equal to the entire length of the front edge portion 13, but may be formed to a length shorter than the entire length of the front edge portion 13.

(First rib 19A) On the positive pressure surface 16 of the wing 12A, a first rib 19A, a second rib 20 and a third rib 21 are formed. The first rib 19A is formed on a substantially circumference centered on the center of the hub portion 11, and the position downstream of the bent portion 18 is taken as the starting end and extends toward the rear edge portion 14. In this embodiment, two first ribs 19A are formed. The center position in the radial direction of the wing 12A in these two first ribs 19A (here, the intermediate position in the radial direction of the wing 12A of the two first ribs 19A) is the outer peripheral side end portion of the wing 12A ( The peripheral edge portion 15) is closer to the end portion on the inner peripheral side. That is, the wing 12A includes the first rib 19A group including at least one or more first ribs 19A, and the radial center position of the wing 12A of the first rib 19A group is closer to the inner periphery than the outer peripheral end of the wing 12A The position of the side end. This point is also the same in the configuration of the first rib in the following other embodiments.

The size of the first rib 19A is, as shown in FIG. 9, the width in the direction perpendicular to the direction of the central axis 25 (hereinafter referred to as the axial direction) is 0.6 to 1.5 mm, and the height in the axial direction is 0.5 to 1.5 mm. In addition, the two first ribs 19A shown in FIG. 8 have a width of 1.0 mm and a height of 0.8 mm, for example.

In addition, the height of the first rib 19A is preferably appropriately selected from the range of 0.5 to 4 mm. The height in this range is higher than the boundary layer of the airflow formed on the surface of the positive pressure surface 16 of the wing 12A. This point is also the same for the first ribs 19 other than the second rib 20 and the third rib 21 and the first rib 19A described later.

(Second rib 20) Fig. 10 is a cross-sectional view seen from D-D in Fig. 5. FIG. 11 is an enlarged view of a cross-sectional portion near the bent portion 18 shown in FIG. 10. FIG. 12 is an explanatory diagram showing the shape of the second rib 20 included in the wing 12A.

As shown in FIG. 6, the second rib 20 is formed along the front edge portion 13 on the surface of the bent portion 18 on the side of the positive pressure surface 16. Specifically, the second rib 20 is formed in the fold 18a of the bent portion 18 and extends in the radial direction of the wing 12A together with the fold 18a.

As shown in FIG. 12, the size of the second rib 20 has a width in the direction perpendicular to the axial direction of 0.6 to 2.0 mm, and a height in the axial direction of 0.5 to 1.5 mm. In addition, the second rib 20 shown in FIG. 11 has a width of 2.0 mm and a height of 1.0 mm, for example. In addition, the second rib 20 may have, for example, a rounded convex shape having R (curved at the top) at the top.

In the present embodiment, although the second rib 20 is formed in the fold 18a of the bent portion 18, it is not limited to this, as long as the bent portion 18 formed on the positive pressure surface 16 side along the front edge portion 13 is can.

(Third rib 21) The third rib 21 is formed in the tail-shaped protruding portion 22, and the downstream end portion is located radially outward of the wing 12A compared to the upstream end portion. In addition, in this embodiment, although the case where only one third rib 21 is formed is shown, it may be formed in plural.

In this embodiment, the size of the third rib 21 is such that the width in the direction perpendicular to the axial direction is 0.6 to 1.5 mm, and the height in the axial direction is 0.5 to 1.5 mm.

(Swell 23) As shown in FIG. 4, the wing 12A includes a raised portion 23 that is a convex curved portion toward the positive pressure surface 16 side. In the raised portion 23, the positive pressure surface side of the blade 12A becomes convex and the negative pressure surface side becomes concave, and extends from the upstream position to the downstream position of the blade 12A. In detail, the raised portion 23 is a state where the ridgeline extends from the front edge portion 13 side to the rear edge portion 14 side, and is gently curved in a convex shape (convex curved portion). In the present embodiment, the raised portion 23 is located on the outer peripheral side of the first rib 19A on the outermost peripheral side. That is, all the first ribs 19A are located on the inner side in the radial direction of the wing 12A than the raised portion 23. In addition, the positional relationship between the first rib 19A group and the raised portion 23 is not limited to this, as long as the radial center position of the wings 12A of the first rib 19A group is located on the inner peripheral side of the raised portion 23.

(Operation and advantages of propeller fan 10A) In the above configuration, when the propeller fan 10A rotates, the wind flowing from the front edge portion 13 of the wing 12A to the wing surface of the wing 12A flows from the front edge portion 13 to the circumferential direction substantially, and flows out from the rear edge portion 14.

(Action and advantages caused by the first rib 19A) The flow of the wind on the wing surface of the wing 12A is different in the radial direction inside and outside of the wing 12A, and on the front edge portion 13 side and the rear edge portion 14 side. When such wind flows intersect on the airfoil, it becomes a cause of noise. However, in the wing 12A of the propeller fan 10A, the wind sent from the rear edge portion 14 around the first rib 19A first turns around the positive pressure surface 16 along the first rib 19A from the high pressure side to the low side, and then , Which further returns to the negative pressure surface 17 side, and becomes almost a certain flow.

Therefore, the propeller fan 10A includes the first rib 19A, whereby the occurrence of noise due to the intersection of wind (air flow) on the wing surface of the wing 12A can be suppressed.

Also, as described above, the first rib 19A is formed on the substantially circumferential surface of the positive pressure surface 16, for example, with the central axis 25 as the center. When the first rib 19A can prevent the airflow from colliding with each other on the wing surface, it can be The wind speed at the formation position of the first rib 19A becomes faster. In this case, in the propeller fan 10A, in particular, the center position in the radial direction of the blade 12A of the first rib 19A group becomes a position closer to the inner circumferential side end than the outer circumferential side end of the blade 12A.

Therefore, the wind speed outside the radial direction of the wing 12A can suppress the influence on the fast wind, that is, the wind speed of the fast outside wind in the radial direction can be suppressed, and the wind speed inside the radial direction can be increased. As a result, the difference in the wind speed between the radially outer side and the radially inner side of the wing 12A is reduced. Therefore, the difference in the wind speed between the radially outer side and the radially inner side of the wind sent by the propeller fan 10A is reduced, and the user of the electric fan 1 can be reduced. Send a gentle wind. In addition, while suppressing the change in the air volume outside the radial direction of the propeller fan 10A, it is possible to increase the air volume inside the radial direction and extend the reach distance of the wind.

In addition, the propeller fan 10A includes the first rib 19A to increase the strength. Thereby, it is possible to reduce the thickness, reduce the weight, and reduce the material cost. This point is also the same by including the second rib 20 and the third rib 21.

In addition, when the first rib 19A is provided on the upstream side of the fold 18a of the bent portion 18, it affects the angle of inflow of the wind to the wing 12A, preferably from the downstream side of the fold 18a, that is The position setting does not affect the inflow angle of the wind to the wing 12A. With such a configuration, the first ribs 19A can suppress the conflict between the mainstreams on the airfoil, and can rectify the airflow more favorably.

(Detailed description of raising the wind speed in the radial direction by the first rib 19A) FIG. 13(a) shows the wind speed distribution on the wing surface when the wing 12A does not include the first rib 19A, and the wind speed distribution near the rear edge portion 14 of the wing 12A when the wing 12A does not include the first rib 19A Illustration. 13(b) is an illustration showing the wind speed distribution on the wing surface when the wing 12A includes the first rib 19A, and the wind speed distribution near the rear edge portion 14 of the wing 12A when the wing 12A includes the first rib 19A Figure.

As shown in FIG. 13(a), when the wing 12A does not include the first rib 19A, the wind speed distribution on the wing surface of the wing 12A changes in the difference between the outer and inner wind speeds in the radial direction (outside: fast, inside: slow) Big. Therefore, the wind speed distribution on the downstream side of the wing 12A is radially outside and inside. Although the wind speed difference is slightly reduced, it is maintained in a state where the wind speed difference is large.

On the other hand, as shown in FIG. 13(b), when the blade 12A includes the first rib 19A, there is a position where the wind speed is fast inside. Therefore, the wind speed distribution on the airfoil surface of the wing 12A is faster than that in the case of FIG. 13( a ), and the difference in the wind speed between the outside and the inside in the radial direction is small. Accordingly, the wind speed distribution on the downstream side of the wing 12A is such that the difference in the wind speed between the outside and the inside in the radial direction becomes small, and the fast wind speed can be maintained even in the inside in the radial direction. In addition, there is the fastest wind speed position and the like, and as a whole the wing 12A can maintain a fast wind speed.

(Due to the action and advantages of the bending portion 18) 14 is a cross-sectional view taken along the line B-B in FIG. 5 of the wing 12A showing the flow of wind of the wing 12A when the bent portion 18 is not formed. FIG. 15 is a cross-sectional view corresponding to FIG. 6, and is a cross-sectional view of the blade 12A showing the flow of wind when the bent portion 18 is included. In addition, FIG. 15 shows a state where the first rib 19A and the second rib 20 are removed due to the focus on the bent portion 18.

In the wing 12A, as shown in FIGS. 14 and 15, when determining the height of the chord 24 and the wing 12A, that is, when determining the occupable volume of the wing 12A, in order to increase the air volume sent by the wing 12A, change The warpage of the wing 12A becomes large, and it is a common means to set the wing 12A to high lift. However, when the warpage of the wing 12A becomes too large, the efficiency is reduced instead.

Therefore, in the wing 12A, as shown in FIG. 15, the inflow angle β is increased by forming the bent portion 18, and compared with the case where the bent portion 18 is not included (the case in FIG. 14 ), the The lift becomes larger. Accordingly, the wind speed of the wind flowing on the wing surface of the wing 12A can be increased, and the propeller fan 10A can increase the wind speed of the sent wind, that is, the air volume of the sent wind can be increased.

In addition, the bent portion 18 preferably exists near the downstream side of the front edge portion 13 of the wing 12A, for example, within 10% from the front edge portion 13 to the rear edge portion 14 side. That is, in the fold 18a of the bent portion 18, as shown in FIG. 6, the boundary layer may be disturbed in the concave portion on the negative pressure surface 17 side of the fold 18a. Therefore, the bent portion 18 is provided as close to the front edge portion 13 as possible. Thereby, the main flow flowing on the airfoil does not flow into the fold 18a, and can pass above the boundary layer turbulence, and the range of the boundary layer turbulence caused by the bent portion 18 can be stably fixed.

(Actions and advantages caused by the second rib 20) In the wing 12A, as described above, by providing the bent portion 18 close to the front edge portion 13, the inflow angle β can be increased while stably fixing the boundary layer disturbance range. However, if the angle of inclination of the bending portion 18 is simply increased excessively, there is a possibility that the boundary layer disorder may increase due to some opportunities. Therefore, in the wing 12A, further, the second rib 20 is formed along the fold 18a on the positive pressure surface 16 side of the bent portion 18, whereby the increase in the inclination angle of the bent portion 18 can be suppressed while reducing The inflow angle β becomes larger. Accordingly, the wind speed of the wind flowing on the wing surface of the wing 12A can be increased, and the propeller fan 10A can increase the wind speed of the sent wind, that is, the air volume of the sent wind can be increased.

(Including actions and advantages caused by the bent portion 18 and the first rib 19A) The wing 12A includes a bent portion 18, that is, a cross-sectional shape in which the wind speed is increased, whereby the wind speed of the wind flowing on the wing surface of the wing 12A can be increased. In addition, by including the first rib 19A, the wing 12A can suppress the occurrence of noise caused by the wind intersecting on the wing surface, increase the wind speed in the radial direction inside, and reduce the difference in wind speed between the outside and the inside in the radial direction. Thereby, the propeller fan 10A including the blades 12A can send out wind at a fast wind speed on the outside and inside in the radial direction while suppressing the occurrence of noise.

(Operations and advantages caused by the tail-shaped protrusion 22 and the third rib 21) By including the tail-shaped protrusion 22, the wing 12 can divert the flow of the wind that pushes downstream toward the downstream without including the tail-shaped protrusion 22, and can be greatly diffused radially outward. That is, the tail-shaped protrusion 22 can control the blade end vortex and strongly send the blade end vortex outward in the radial direction, whereby the wind can be diffused outward in the radial direction.

In addition, the third rib 21 formed in the tail-shaped protruding portion 22 has the downstream end portion positioned radially outward of the blade 12A compared to the upstream end portion. Therefore, the wind flowing on the wing surface of the tail-shaped protrusion 22 along the third rib 21 becomes faster and regulates the direction of flow.

As a result, the propeller fan 10A includes the tail-shaped protrusion 22 and the third rib 21 by the wing 12A, so that the range of the air supply to the outside in the radial direction can be widened, and the initial velocity of the wind outside the radial direction can be increased to increase the wind speed. Reach distance.

(Operations and advantages caused by the raised portion 23) The wing 12A includes a bulging portion 23 that is convex toward the positive pressure surface 16 side, whereby the horseshoe vortex and the wing tip vortex can be maintained in the vicinity of the ridge 23 on the surface layer of the wing surface, and the horseshoe vortex and the wing tip vortex can be suppressed Detach from the surface of the airfoil.

In addition, in the vicinity of the region where the raised portion 23 exists, the main flow flows from the radial direction outer side toward the radial direction inner side, and is separated from the radial direction outer side toward the radial inner side of the raised portion 23. In this case, the wind speed in which the raised portion 23 is radially inward is slower than the wind speed in which the raised portion 23 is radially outward. Therefore, the distribution of the blowing wind speed in the radial direction of the wing 12A is that the slowness of the wind speed of the radially inner portion becomes significant. Therefore, in the blade 12A, the first rib 19A is provided as described above, thereby reducing the difference in the wind speed between the radially inner and outer sides of the blade 12A as described later. As a result, as the entire blade 12A (propeller fan 10A), the wind reaching distance can be extended.

(Manufacture of propeller fan 10A) In the present embodiment, the propeller fan 10A is a resin molded product. In this case, the propeller fan 10A can be formed using a molding die for injection molding. As the material of the propeller fan 10A, as mentioned above, for example, an AS resin can be used, or a synthetic resin that increases strength like an AS resin added with glass fiber can also be used.

Generally speaking, as a propeller fan, there are those using metal as a material and forming an integral body by extension molding by stamping. Because these shapes are difficult to extend with thick metal plates and are of high quality, thin metal plates are generally used. In this case, it is difficult to maintain the strength (rigidity) of a large propeller fan. In contrast, although a member called a spider formed of a metal plate thicker than the wing portion is used to fix the wing portion to the rotating shaft, there is a problem that the weight is heavy and the fan balance is also deteriorated. In addition, generally speaking, since a thin metal plate having a certain thickness is used, the cross-sectional shape of the wing cannot be set as a wing shape.

On the other hand, as in the present embodiment, by molding the propeller fan 10A with resin, these problems can be solved together.

In addition, in the case where a DC motor is used for the drive motor to which the propeller fan 10A is fixed, in order to counteract the cocking sound unique to the DC motor and to further reduce noise, it is provided for inserting the rotating shaft 4a. The shaft hole of the hub portion 11 may be formed by inserting a cylindrical rubber hub (boss). In this case, the mold forming the surface on the negative pressure surface 17 side of the propeller fan 10A may be provided by injection molding the rubber hub as the insert member first.

In addition, in the present embodiment, a case where the propeller fan 10A is used for the electric fan 1 as the air blowing device will be described. However, the configuration of the propeller fan 10A of the present embodiment can also be used in the same manner as a circulator or other air blowing device that is an air blowing device. This point is the same for the propeller fan 10A in the following other embodiments.

[Second Embodiment] Other embodiments of the present invention will be described below. In addition, for the convenience of explanation, the components having the same functions as those described in the above embodiments are given the same symbols, and the description thereof will not be repeated.

(Structure of Wing 12B) FIG. 16 is a front view of propeller fan 10A of the present embodiment. FIG. 17 is a front view of the blade 12B included in the propeller fan 10A shown in FIG. 16. In addition, in FIGS. 17 and 16, for simplicity, the description of the bent portion 18 and the second rib 20 is omitted.

The propeller fan 10A of this embodiment includes the blade 12B shown in FIG. 17 instead of the blade 12A. The wing 12B includes the first rib 19B instead of the first rib 19A of the wing 12A. The first rib 19B is the same as the first rib 19A, for example, two are formed. In addition to the first rib 19B, the wing 12B includes a bent portion 18, a second rib 20, a third rib 21, and a raised portion 23 included in the aforementioned wing 12A. That is, the wing 12B has the same configuration as the wing 12A except for the first rib 19B.

The first rib 19A has a position downstream from the bent portion 18 as a starting end, extends toward the rear edge portion 14, and is formed on a substantially circumference centering on the center of the hub portion 11. On the other hand, the first rib 19B is the same as the first rib 19A, and the position on the downstream side from the bent portion 18 is set as the starting end and extends toward the rear edge portion 14. However, the first rib 19B is located on the inner side in the radial direction of the blade 12B than the upstream end (the end on the rear edge 14 side) compared to the upstream end (the end on the front edge 13 side).

(Actions and advantages caused by the first rib 19B) Since the first rib 19B is located on the inner side in the radial direction of the wing 12B than the upstream end, compared with the case of the first rib 19A, the main flow to be flowed outward in the radial direction of the wing 12B is rectified and The effect of pushing out works strongly, and it is possible to make the speed of the wind inward in the radial direction (the area specifically enclosed by a circle in FIG. 17) faster. In addition, when the wind flowing outward in the radial direction is rectified by the first rib 19B, the centrifugal force becomes stronger in the radial outer side. When the two first ribs 19B, the radial outer first rib 19B When the height and width are relatively large, the rectification effect can be further improved.

The other actions and advantages caused by the wing 12B including the first rib 19B are the same as those caused by the first rib 19A. In addition, the operation and advantages of the wing 12B including the bent portion 18, the second rib 20, the third rib 21, and the raised portion 23 are the same as those of the first rib 19A.

[Third Embodiment] Another embodiment of the present invention will be described below. In addition, for the convenience of description, the components having the same functions as the components described in the above embodiments are given the same symbols, and the description thereof is not repeated.

(Structure of Wing 12C) FIG. 18 is a front view of propeller fan 10A of the present embodiment. FIG. 19 is a front view of the blade 12C included in the propeller fan 10A shown in FIG. 18. In addition, in FIGS. 18 and 19, for simplicity, the description of the bent portion 18 and the second rib 20 is omitted.

The wing 12C replaces the first rib 19A of the wing 12A and includes the first rib 19C shown in FIG. 19. The first rib 19C is the same as the first rib 19A, for example, two are formed. In addition to the first rib 19C, the wing 12C includes a bent portion 18, a second rib 20, a third rib 21, and a raised portion 23 included in the aforementioned wing 12A. That is, the wing 12C has the same configuration as the wing 12A except for the first rib 19C.

The first rib 19A is positioned downstream from the bent portion 18 as a starting end, extends toward the rear edge portion 14, and is formed on a substantially circumference centered on the center of the hub portion 11. On the other hand, the first rib 19C is the same as the first rib 19A, and the position on the downstream side of the bent portion 18 is set as the starting end and extends toward the rear edge portion 14. However, the first rib 19C of the first rib 19C on the radially outer side of the wing 12C is different from the first rib 19C on the radially inner side of the wing 12C.

Specifically, the first outer rib 19C in the radial direction is the downstream end (the end on the rear edge 14 side) which is located in the radial direction of the wing 12C compared to the upstream end (the end on the front edge 13 side) The first rib 19C on the inner side in the radial direction is the end on the downstream side (the end on the rear edge 14 side) that is located in the radial direction of the wing 12C compared to the upstream end (the end on the front edge 13 side) Outside.

(Action and advantages caused by the first rib 19C) The first rib 19 is not limited to the configuration such as the first rib 19A or the first rib 19B, but may be configured as the first rib 19C. Since the wing 12C includes the first rib 19C, it has substantially the same actions and advantages as those caused by the wing 12A including the first rib 19A. In addition, the operation and advantages of the blade 12C including the bent portion 18, the second rib 20, the third rib 21, and the raised portion 23 are the same as those of the first rib 19A.

[Fourth Embodiment] Another embodiment of the present invention will be described below. In addition, for the convenience of description, the components having the same functions as the components described in the above embodiments are given the same symbols, and the description thereof is not repeated.

(Structure of Wing 12D) FIG. 20 is a rear view of propeller fan 10A of this embodiment. FIG. 21 is a cross-sectional view taken along line E-E in FIG. 20. FIG. 22 is an enlarged view of the cross-sectional portion of FIG. 21. FIG. 23 is an explanatory diagram showing the shape of the first rib corresponding groove 31 included in the wing 12D.

The propeller fan 10A of this embodiment includes the blade 12D shown in FIG. 20 instead of the blade 12A. The wing 12D includes a first rib corresponding groove (recess) 31, a second rib corresponding groove (recess) 32 and a third rib corresponding groove (recess) 33 on the negative pressure surface 17. The first rib corresponding groove 31 is formed at the position of the negative pressure surface 17 corresponding to the position of the first rib 19A of the positive pressure surface 16 as shown in FIGS. 21 and 22. Similarly, the second rib corresponding groove 32 is formed at the position of the negative pressure surface 17 corresponding to the position of the second rib 20 of the positive pressure surface 16, and the third rib corresponding groove 33 is formed at the position of the third rib 21 corresponding to the positive pressure surface 16 Position of the negative pressure surface 17 position. The first rib corresponding groove 31, the second rib corresponding groove 32, and the third rib corresponding groove 33 have shapes corresponding to the shapes of the first rib 19A, the second rib 20, and the third rib 21, respectively.

In addition, the wing 12D is not limited to the structure including the first to third rib-corresponding grooves 31 to 33, and at least the first rib-corresponding groove 31 may be included. In addition, the wing 12D may include the first rib 19B or the first rib 19C instead of the first rib 19A.

The first rib corresponds to the size of the groove 31. As shown in FIG. 23, it is the same as the first rib 19A shown in FIG. 9, and the width in the direction perpendicular to the direction of the central axis 25 (hereinafter, referred to as the axis direction) is 0.6 to 1.5. mm, the height in the axial direction is 0.5 to 1.5 mm. The two first ribs 19A and the two first rib corresponding grooves 31 shown in FIG. 20 have a width of 1.0 mm and a height of 0.8 mm, for example. Similarly, the second corresponding groove 3 and the third corresponding groove 33 also have shapes corresponding to the second rib 20 and the third rib 21, respectively.

(Advantages of Wing 12D) Since the position of the wing 12D on the negative pressure surface 17 corresponding to the positions of the first rib 19A, the second rib 20, and the third rib 21 of the positive pressure surface 16 includes the first rib corresponding groove 31, the second rib corresponding groove 32, and the third The rib corresponds to the groove 33, and the thickness of the formation position of the first rib 19A, the second rib 20, and the third rib 21 does not increase. Thereby, the wings 12D can be easily molded using the resin of the mold, and the resin materials used can be reduced.

(Modification of the first to third ribs) FIG. 24 is a front view of the wing 12A showing an example in which the first rib 19A shown in FIG. 4 is formed discontinuously. In the above embodiment, for example, the first rib 19A does not necessarily need to be continuous. As shown in FIG. 24, it may be interrupted to be discontinuously formed. This point is the same for the other first ribs 19B and 19C, the second rib 20 and the third rib 21.

(Including wind speed measurement results of propeller fan of each wing) Next, the measurement result of the wind speed of the propeller fan including each blade will be described. Here, the measurement is performed on the first to fifth propeller fans including each of the first wing (a) to the fifth wing (e) shown in FIG. 25. In the following, for simplicity, these propeller fans are simply referred to as wing (a) propeller fan, wing (b) propeller fan, wing (c) propeller fan, wing (d) propeller fan, and wing (e) Propeller fan.

25(a) is a front view showing the first wing (a), FIG. 25(b) is a front view showing the second wing (b), and FIG. 25(c) is a front view showing the third wing (c) FIG. 25(d) is a front view showing the fourth wing (d), and FIG. 25(e) is a front view showing the fifth wing (e). 25(f) is a propeller fan including seven wings to be measured including any one of the first wing (a) of FIG. 25(a) to the fifth wing (e) of FIG. 25(e). Front view.

The first wing (a) is a wing that does not include the first ribs 19A to 19C, the second rib 20, the third rib 21, and the bent portion 18. The second wing (b) is a wing including only the bent portion 18 and not including the first ribs 19A to 19C, the second rib 20 and the third rib 21. The third wing (c) is a wing that includes only two first ribs 19B and one third rib 21 and does not include the second rib 20 and the bent portion 18. The fourth wing (d) is a wing that includes only two first ribs 19C, one third rib 21, and a bent portion 18, and does not include the second rib 20. The fifth wing (e) is a wing that includes only two first ribs 19B, one third rib 21, and a bent portion 18, and does not include the second rib 20. In addition, the first rib group 19B (two first ribs 19B) of the third wing (c) and the fifth wing (e), and the first rib group 19C group (two first ribs) of the fourth wing (d) The center position of the wings in the radial direction of the group 19C) is closer to the inner peripheral end than the outer peripheral end of the wing.

(Measurement result 1) 26 is a table showing the measurement results of the wind speed at a position 2 cm downstream of each propeller fan including each blade shown in FIG. 25. FIG. 27 is a table showing the air volume and maximum wind speed of each propeller fan obtained from the results of FIG. 26. Fig. 28 is a graph showing the measurement result of Fig. 26.

For the first to fifth propeller fans (wing (a) propeller fan to wing (e) propeller fan), at a position 2 cm downstream of the propeller fan, from the center of the propeller fan to the propeller fan Move the measurement point in the direction perpendicular to the axis of the axis, and measure the wind speed to the right (+ side) in the radial direction and the left side (- side) in the radial direction at intervals of 5 cm. The measurement of each position is carried out every minute and one minute (60 points), and the measurement result is set to the average of these 60 points. As a result, the measurement results shown in FIGS. 26 and 28 are obtained.

In addition, from the results of FIGS. 26 and 28, the results shown in FIG. 27 are obtained with respect to the air volume and maximum wind speed of each propeller fan. The air volume is calculated according to the Japanese Industrial Standard (JIS) method (JISC9601), multiplied by the sum of the ring areas.

In addition, in the Japanese Industrial Standards, the measurement method for wind speed is specified in FIG. 29, and the calculation method for air volume is specified in FIG. 30.

(Review of measurement result 1) The wing (c) propeller fan and the wing (e) propeller fan are located closer to the radial center of the wing of the first rib 19B group (two first ribs 19B) than the outer peripheral end of the wing The location of the peripheral end. Similarly, in the wing (d) propeller fan, the radial center position of the wing of the first rib 19C group (two first ribs 19C) becomes a position closer to the inner peripheral end than the outer peripheral end of the wing . From the results in FIG. 28, it can be seen that the wing (c) propeller fan, the wing (e) propeller fan, and the wing (d) propeller fan have a faster wind speed than the wing (a) propeller fan. The wind speed of the inner circumferential side portion in the radial direction is fast.

In addition, from the results of FIG. 27, it can be seen that in the wing (b) propeller fan and the wing (c) propeller fan, the air volume and the maximum wind speed increase as compared with the wing (a) propeller fan.

In addition, it can be seen that in the wing (d) propeller fan and the wing (e) propeller fan, the bent portion 18 (wing (b)) and the first rib 19C (wing (c)) of the front edge 13 or The effect obtained by adding the first ribs 19B greatly increases the air volume and the maximum wind speed compared to the wing (a) propeller fan, wing (b) propeller fan, and wing (c) propeller fan. For example, the difference between the wing (c) propeller fan and the wing (e) propeller fan is only the presence or absence of the bent portion 18. However, the increase rate of the air volume of the wing (e) propeller fan relative to the wing (a) propeller fan is not a simple addition value of the air volume increase rate of the wing (b) propeller fan and the wing (c) propeller fan ( 4.2% + 2.0% = 6.2%), becoming 11.6%, a substantial increase. This is the same for the maximum wind speed.

(Measurement result 2) 31 is a table showing the measurement results of the wind speed at a position 90 cm downstream of each propeller fan including each blade shown in FIG. 25. 32 is a table showing the air volume and maximum wind speed of each propeller fan obtained from the results of FIG. 31. Fig. 33 is a graph showing the measurement result of Fig. 31.

For the first to fifth propeller fans (wing (a) propeller fan to wing (e) propeller fan), at a position 90 cm downstream of the propeller fan, from the center of the propeller fan to the propeller fan Move the measurement point in the direction perpendicular to the axis of the axis, and measure the wind speed to the right (+ side) in the radial direction and the left side (- side) in the radial direction at intervals of 5 cm. The measurement of each position is carried out every minute and one minute (60 points), and the measurement result is set to the average of these 60 points. As a result, the measurement results shown in FIGS. 31 and 33 are obtained. In addition, from the results of FIGS. 31 and 33, the results shown in FIG. 32 are obtained with respect to the air volume and maximum wind speed of each propeller fan.

In addition, in FIG. 31, the distance (cm) indicates the distance from the center of the propeller fan to the measurement point outside the propeller fan in the radial direction. The coefficient (K) is the above-mentioned annular area. ＋Vn (1 minute) is the wind speed between one minute or two minutes from the center of the propeller fan to the measurement point on the right side (+ side) in the radial direction. －Vn (1 minute) is the wind speed between one minute or two minutes from the center of the propeller fan to the measurement point on the left side (-side) in the radial direction. Qn is the air volume of each ring-shaped part (ring-shaped part sequentially from the inside).

(Review of measurement result 2) For the wing (c) propeller fan and wing (e) propeller fan, as well as the wing (d) propeller fan, the wind speed of the inner peripheral side of the radial direction, the wing (b) propeller fan, and the wing (c) propeller The air volume and maximum wind speed of the fan, and the air volume and maximum wind speed of the wing (d) propeller fan and the wing (e) propeller fan are the same as those of the measurement result 1 and the measurement results.

〔to sum up〕 The propeller fan related to the first aspect of the present invention includes: a rotating shaft portion; a wing; and the wing includes: a front edge portion formed from the rotating shaft portion toward the outside and on the side in the direction of rotation; a rear edge portion, On the side opposite to the direction of rotation; and the peripheral edge portion connecting the front end portion of the front edge portion and the front end portion of the rear edge portion and formed in the circumferential direction; and the wing includes a first rib group on the positive pressure surface, the The first rib group includes one or more first ribs extending from the upstream side, that is, the front edge portion side, to the downstream side, that is, the rear edge portion side; and the radial center position of the wing of the first rib group becomes the same as the The outer peripheral end of the wing is closer to the inner peripheral end.

The propeller fan according to the second aspect of the present invention may be configured such that, in the above-described first aspect, the first rib is located on the inner side in the radial direction of the wing than the upstream end.

The propeller fan according to the third aspect of the present invention may be configured such that, in the above-mentioned first or second aspect, the wing includes a bent portion in a region along at least a part of the leading edge portion , With a specific width from the front edge portion to the rear edge portion, and the fold becomes convex toward the positive pressure surface side; and the first rib is the downstream end of the bent portion as the starting end and It extends to the rear edge portion side.

The propeller fan according to the fourth aspect of the present invention may be configured such that, in the above-described third aspect, the wing includes a second rib, and the surface of the second rib on the positive pressure surface side of the bent portion is along the front The edge portion is formed.

The propeller fan according to the fifth aspect of the present invention may be configured so that in any of the above first to fourth aspects, the wing includes a tail-shaped protrusion at the trailing edge portion, the tail-shaped protrusion facing the The direction of the leading edge portion is a tongue-shaped protrusion in the opposite direction; and a third rib extending in the extending direction of the tail-shaped protrusion is formed on the surface of the tail-shaped protrusion.

The propeller fan according to the sixth aspect of the present invention may be configured so that in any of the first to fifth aspects described above, the wing includes a raised portion, and the raised portion is convex on the positive pressure surface side and the negative pressure surface The side becomes a concave convex curved portion; and the center position of the first rib group is located on the inner circumferential side of the wing in the radial direction compared with the raised portion.

The propeller fan according to the seventh aspect of the present invention may be configured so that in any of the first to sixth aspects described above, the wing includes a recessed portion that is negative at the position of the first rib corresponding to the positive pressure surface The position of the pressing surface is a shape corresponding to the shape of the first rib.

The air supply device of the eighth aspect of the present invention includes the propeller fan of any one of the above first to seventh aspects.

The present invention is not limited to the above-mentioned embodiments, and various changes can be made within the scope shown in the patent application scope. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in this The technical scope of the invention. Furthermore, by combining the technical methods disclosed in the respective embodiments, it is possible to form new technical features.

1‧‧‧Electric fan (air supply device) 10A‧‧‧Propeller fan 11‧‧‧Hub 12A～12D‧‧‧wing 13‧‧‧ Front edge 14‧‧‧ Rear edge 15‧‧‧ peripheral part 16‧‧‧Positive pressure surface 17‧‧‧Negative pressure surface 18‧‧‧Bending Department 18a‧‧‧Creasing 19A～19C‧‧‧First rib 20‧‧‧The second rib 21‧‧‧ third rib 22‧‧‧Caudal protrusion 23‧‧‧Bulge 24‧‧‧wing string 25‧‧‧Central axis 31‧‧‧The first rib corresponds to the groove (recess) 32‧‧‧The second rib corresponds to the groove (recess) 33‧‧‧The third rib corresponds to the groove (recess)

FIG. 1 is a partial exploded side view of an electric fan including a propeller fan according to an embodiment of the present invention. FIG. 2 is a perspective view of the propeller fan shown in FIG. 1 viewed from the front. FIG. 3 is a perspective view of the propeller fan shown in FIG. 1 viewed from the back side. Fig. 4 is a front view of the propeller fan shown in Fig. 1. Fig. 5 is a rear view of the propeller fan shown in Fig. 1. 6 is a cross-sectional view taken along line B-B in FIG. 5. 7 is a cross-sectional view taken along C-C in FIG. 5. 8 is an enlarged view of a cross-sectional portion of the wing of FIG. 7. 9 is an explanatory view showing the shape of the first rib shown in FIG. 4. Fig. 10 is a cross-sectional view seen from D-D in Fig. 5. Fig. 11 is an enlarged view of a cross-sectional portion near the bent portion shown in Fig. 10. FIG. 12 is an explanatory diagram showing the shape of the second rib shown in FIG. 4. 13(a) is a diagram showing the wind speed distribution on the wing surface when the wing shown in FIG. 4 does not include the first rib, and the wind speed distribution near the rear edge portion of the wing when the wing does not include the first rib Illustration. 13(b) is an illustration showing the wind speed distribution on the wing surface when the wing shown in FIG. 4 includes the first rib, and the wind speed distribution near the rear edge portion of the wing when the wing includes the first rib Figure. 14 is a cross-sectional view taken along the line B-B of FIG. 5 showing the flow of the wind of the wing when the wing shown in FIG. 4 does not include a bent portion. FIG. 15 is a cross-sectional view corresponding to FIG. 6, and is a cross-sectional view of a wing showing the flow of wind when the wing includes a bent portion. 16 is a front view of a propeller fan according to another embodiment of the present invention. 17 is a front view of the wing included in the propeller fan shown in FIG. 16. 18 is a front view of a propeller fan according to still another embodiment of the present invention. 19 is a front view of the wing included in the propeller fan shown in FIG. 18. 20 is a rear view of a propeller fan including still another embodiment of the present invention. FIG. 21 is a cross-sectional view taken along line E-E in FIG. 20. FIG. Fig. 22 is an enlarged view of a cross-sectional portion of the wing shown in Fig. 21. FIG. 23 is an explanatory view showing the shape of the groove corresponding to the first rib included in the blade shown in FIG. 22. 24 is a front view of a wing showing an example of a case where the first rib shown in FIG. 4 is formed discontinuously. 25(a) is a front view showing the wing of the first propeller fan to be measured, FIG. 25(b) is a front view showing the wing of the second propeller fan, and FIG. 25(c) is a third propeller FIG. 25(d) is a front view showing the wing of the fourth propeller fan, and FIG. 25(e) is a front view showing the wing of the fifth propeller fan. 25(f) is a propeller fan including seven wings to be measured including any one of the first wing (a) of FIG. 25(a) to the fifth wing (e) of FIG. 25(e). Front view. 26 is a table showing the measurement results of the wind speed at a position 2 cm downstream of each propeller fan including each blade shown in FIG. 25. 27 is a table showing the air volume and maximum wind speed of each propeller fan obtained from the results of FIGS. 26 and 28. Fig. 28 is a graph showing the measurement result of Fig. 26. FIG. 29 is a diagram for explaining the measurement method of wind speed in Japanese Industrial Standards (JIS). FIG. 30 is a diagram explaining the calculation method of the air volume by Japanese Industrial Standards. 31 is a table showing the measurement results of the wind speed at a position 90 cm downstream of each propeller fan including each blade shown in FIG. 25. 32 is a table showing the air volume and maximum wind speed of each propeller fan obtained from the results of FIGS. 31 and 33. Fig. 33 is a graph showing the measurement result of Fig. 31.

10A‧‧‧Propeller fan

11‧‧‧Hub

12A‧‧‧wing

13‧‧‧ Front edge

14‧‧‧ Rear edge

15‧‧‧ peripheral part

16‧‧‧Positive pressure surface

18‧‧‧Bending Department

19A‧‧‧The first rib

20‧‧‧The second rib

21‧‧‧ third rib

22‧‧‧Caudal protrusion

23‧‧‧Bulge

A‧‧‧arrow

Claims (8)

A propeller fan, including: Rotating shaft Wing; and the wing contains: The front edge portion is formed outward from the rotation shaft portion, and is on the rotation direction side; The rear edge, on the side opposite to the direction of rotation; and A peripheral edge portion connecting the front end portion of the front edge portion and the front end portion of the rear edge portion and formed in the circumferential direction; and The wing includes a first rib group on the positive pressure surface, the first rib group including one or more first ribs extending from the upstream side, that is, the front edge portion side, to the downstream side, that is, the rear edge portion side; and the first rib The center position of the wing in the radial direction of the group becomes a position closer to the inner peripheral end than the outer peripheral end of the wing. For example, the propeller fan in the first scope of the patent application, in which The first rib is located on the inner side in the radial direction of the wing than the upstream end. For example, the propeller fan of patent application item 1 or 2, wherein, The wing includes a bent portion, which is a region along at least a part of the front edge portion, has a specific width from the front edge portion to the rear edge portion, and the fold becomes convex toward the positive pressure surface side; And The first rib extends toward the rear edge portion with the position downstream of the bent portion as the starting end. For example, the propeller fan according to item 3 of the patent scope, in which The wing includes a second rib formed along the front edge portion on the positive pressure surface side of the bent portion. The propeller fan according to any one of items 1 to 4 of the patent application scope, wherein, The wing includes a tail-shaped protrusion at the rear edge portion, and the tail-shaped protrusion portion protrudes in a tongue shape in a direction opposite to the direction of the front edge portion; and the tail-shaped protrusion portion is formed on the surface of the tail-shaped protrusion portion The third rib extending in the extending direction of the protrusion. The propeller fan according to any one of items 1 to 5 of the patent application, wherein, The wing includes a raised portion, which is a convex curved portion that becomes convex on the positive pressure surface side and becomes concave on the negative pressure surface side; and The center position of the first rib group is located on the inner peripheral side of the wing in the radial direction compared to the raised portion. The propeller fan according to any one of items 1 to 6 of the patent application, wherein, The wing includes a recessed portion having a shape corresponding to the shape of the first rib at the position of the negative pressure surface corresponding to the position of the first rib of the positive pressure surface. An air supply device, including: The propeller fan according to any one of the items 1 to 7 of the patent scope.

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