JP5076796B2 - Fan - Google Patents

Description

    The present invention relates to an electric fan that blows air over a wide range of 360 degrees.

  Conventionally, an electric fan blows air by rotating an axial fan provided horizontally with the ground, and swings the fan part in a reciprocating manner to blow air over a wide range. There is one in which a plate material is arranged in an annular shape around a direction perpendicular to the ground as an axis to blow 360 degrees (see, for example, Patent Document 1).

  Hereinafter, the electric fan will be described with reference to FIG.

  As shown in the figure, the electric fan main body 101 has a pedestal 102, a support column 103, and a blower 104. The pedestal 102 functions as a base of the electric fan main body 101, and an operation unit 105 is provided. Further, the support column 103 is erected on the upper surface of the base unit 102 to support the air blowing unit 104. The air blowing unit 104 includes a case unit 106, a cover unit 107, and an electric motor (not shown) housed in the case, A rotating shaft 108 and an impeller 109 are provided.

In the above configuration, when the operation is started by the operation unit 105, the electric motor is rotated, and the rotating shaft 108 is rotated accordingly, and thus the impeller 109 is rotated. Air above and below the rotating impeller 109 is sucked and blown toward the periphery of the impeller 109. Further, by attaching the wind shield portion 110, it is possible to form a region that covers a part of the circumferential direction of the cover portion 107 and is not blown in the horizontal direction.
JP 2006-63948 A (FIG. 1)

  In such a conventional fan, instead of performing a wide range of air blowing in the circumferential direction, the wind speed decreases in proportion to the square of the distance, so that there is a problem that the air blowing to a distant place is inferior.

  Moreover, since the dimension of the rotating shaft direction is larger than that of the axial fan, there is a problem that the movable space of the impeller is increased and the range of the movable range is increased.

  The present invention solves such a conventional problem, and by increasing the initial speed in the vicinity of the electric fan, it is possible to improve the air blowing capacity to a distant place, and the space inside the impeller is not made the movable range of the impeller. Thus, an object of the present invention is to provide a fan that can reduce the range of the movable range.

For ceiling fan of the present invention to achieve the above object, it performs the vertical rotary shaft and the electric motor, a blower is connected before Symbol electric motor and the electric motor that rotates coaxially to 360 degrees in the centrifugal direction on the ground An impeller having an impeller, wherein the impeller includes an annular main plate connected to the electric motor, a plurality of impellers provided annularly on a surface of the main plate, and a impeller facing the main plate. The impeller is provided with a diverting means in the direction of the outlet flow axis, and the areas of the holes in the main plate and the side plate are different .

  Another means is that the tangential extension line of the inner end point in the axial vertical cross-sectional shape of the slat is directed in the rotational direction from the straight line connecting the inner end point and the rotation axis, and the extension tangent of the outer end point is the outer end point and the rotation axis. It is characterized by being directed in the reverse direction of rotation rather than a straight line connecting the two.

  Another means is characterized in that the ratio of the total area of the holes of the main plate and the side plate to the area of the circle calculated from the outer diameter of the blade is 0.6 or more.

  The other means is characterized in that the edge of one or both of the main plate and the side plate is smoothly tapered in a nozzle shape toward the outside in the axial direction of the impeller.

  The other means is characterized in that the shape of the cross section passing through the rotation axis of the edge of one or both of the main plate and the side plate is a semicircular shape protruding outward in the axial direction of the impeller. is there.

  Another means is characterized in that a guard for protecting the impeller is provided around the impeller.

  Another means is characterized in that an orifice for smoothly guiding the airflow is provided on the axially outer side of the impeller on one side or both sides of the main plate and the side plate through a guard.

  Further, the other means is characterized in that an additional function other than the air blowing fixed to the inside of the impeller through a guard on the side opposite to the electric motor is provided.

  The other means is characterized in that the motor is an outer rotor motor and is provided with an additional function other than air blowing fixed to the stator tip inside the impeller.

  Another means is characterized in that an electric motor is fixed to a stand apex portion having a base portion, a column portion, and a case portion, and an impeller is provided above the electric motor.

  Another means is characterized in that a motor is fixed by providing a case with a column or wire suspended from the ceiling of the room, and an impeller is provided below the motor.

According to the present invention, it is possible to improve the air blowing capability to a distant place by increasing the initial speed in the vicinity of the electric fan, and to reduce the area of the movable range by making the space inside the impeller not be the movable range of the impeller. Ru can provide. In addition, by providing a turning means to the impeller, it is possible to provide a turning means that has little resistance and does not increase the volume, and by changing the wind direction, in addition to the effect that the person can reliably cool off. By setting the wind direction in accordance with the cooling and heating when using the air conditioner, it is possible to function as an effective circulator.

Fan according to claim 1 of the present invention, an impeller for performing an electric motor in a perpendicular direction to the rotation axis to the ground, the connected before Symbol electric motor and the electric motor which rotates coaxially blown into 360 degrees in the centrifugal direction The impeller includes an annular main plate connected to the electric motor, a plurality of annular blades provided annularly on the surface of the main plate, and an annular shape sandwiching the blade plate opposite the main plate The main plate and the side plate provided at both ends have a rectifying effect, so that the wind speed is increased by suppressing the turbulence and vortex generation at the axial end of the outer periphery of the slats. Since the movable part can be made small inside, it can be used as a space for providing other additional functions without interfering with the flow of air, and furthermore, since the blades are fixed at both ends. It is possible to ensure sufficient strength Further, the impeller is provided with a direction change means for the blowout flow axis direction, and it is possible to ensure that the person can be surely changed by changing the wind direction instead of making the blowout axis direction horizontal with the ground. In addition to the effect of cooling off, setting the wind direction according to the cooling and heating when using the air conditioner can also serve as an effective circulator. In addition, the area of the holes in the main plate and the side plate is different, and the amount of air sucked in the large direction of the holes in the main plate and the side plate is taken into account, and the flow blown from the fan is drawn in the direction of the large hole. By providing the impeller with a turning means, it is possible to provide a turning means that has little resistance and does not increase the volume.

  Further, in the invention according to claim 2, the tangential extension line of the inner end point in the axial vertical cross-sectional shape of the slat is directed in the rotational direction from the straight line connecting the inner end point and the rotation axis, and the extension tangent of the outer end point is the outer end point. It is characterized by being directed in the opposite direction of rotation than the straight line connecting the rotating shaft and the rotating shaft, and the blades provided in the ring form the air flow of the centrifugal fan and, like the centrifugal fan, the inner end point shape is less lossy The air can be taken in, and the ratio of the work amount to the load can be increased with the outer end point shape, and the wind speed can be increased with a highly efficient impeller.

  The invention according to claim 3 is characterized in that the ratio of the total area of the holes of the main plate and the side plate to the area of the circle calculated from the outer diameter of the blade is 0.6 or more. Therefore, even if the main plate and the side plate are simple planes, the wind speed can be easily increased by the rectifying effect of the main plate and the side plate.

The invention according to claim 4 is characterized in that the edge of one or both holes of the main plate and the side plate is smoothly tapered in a nozzle shape toward the outside in the axial direction of the impeller, When flowing into the impeller in the axial direction from the hole in the side plate, and the flow is redirected in the centrifugal direction by the vane plate, the flow is guided by a smooth curved surface like a nozzle. Decreases and wind speed can be increased.

The invention according to claim 5 is characterized in that the shape of the cross section passing through the rotation axis at the edge of one or both holes of the main plate and the side plate is a semicircular shape that protrudes outward in the axial direction of the impeller. It is a semi-circular smooth curved surface when air approaches from the circumferential direction toward the holes of the main plate and side plate, and when it flows into the axial flow when flowing from the holes of the main plate and side plate. Since the flow is guided, the vortex generated at the time of turning is suppressed, the suction resistance is reduced, and the wind speed can be increased.

The invention described in claim 6 is characterized in that a guard for protecting the impeller is provided around the impeller to prevent contact of other objects with the rotating impeller, or at the time of falling. Can prevent the impeller from being damaged.

The invention according to claim 7 is characterized in that a curved orifice that smoothly guides the airflow is provided on the outer side in the axial direction of the impeller on one side or both sides of the main plate and the side plate through the guard, When air approaches the holes in the main plate and side plate from the circumferential direction and flows in through the holes in the main plate and side plate, the flow can be rectified by the smooth curved surface of the curved orifice when the flow is changed to the axial direction. The wind speed can be increased by reducing the resistance generated in the direction and guiding it to the impeller.

Further, the invention described in claim 8 is characterized in that an additional function other than the air blowing fixed inside the impeller via a guard is provided on the side opposite to the motor, and the stationary guard is provided. In this way, it is possible to stably fix other functional parts provided inside the impeller and to give the fan an additional function without increasing the volume.

The invention according to claim 9 is characterized in that the motor is an outer rotor motor and has an additional function other than air blowing fixed to the stator tip inside the impeller. By supporting the other function part, it becomes possible to stably fix the other function part inside the impeller and to give the electric fan an additional function without increasing the volume.

The invention of claim 1 0, wherein the electric motor is fixed to the stand top portion having a base portion and a support portion and the case portion is obtained by comprising the impeller above the motor, transportable It is possible to provide a fan that can be easily moved.

The invention of claim 1 1, wherein the electric motor is fixed includes a case portion to the post or wire suspended from the room ceiling, it is obtained by comprising the impeller below the motor, the floor surface It is possible to make a fan that does not occupy and takes up no place.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

( Reference form 1)
FIG. 1 is a perspective view of an electric fan according to Reference Embodiment 1 of the present invention, and FIG. 2 is a top view of an impeller. As shown in FIG. 1, fan 1 according to the first reference of the present invention, a stand 6 consists of struts 5 with case portion 4 to the base portion 3 and the front end having an operating portion 2, the case portion 4 The motor is supported by an electric motor (not shown) and an impeller 9 that rotates on the same rotating shaft 7 as the electric motor and is connected to the shaft 8 of the electric motor. The impeller 9 has a shaft support portion 10 and is not a support portion. Is an annular main plate 11 having an inner diameter of 260 mm and an outer diameter of 300 mm, a blade plate 12 having a height of 120 mm and a width of 82 mm, and a plane in which the main plate 11 has the same inner diameter and outer diameter as the main plate and the blade plate. Side plate 13.

  As shown in FIG. 2, the blade 12 has a cross-sectional shape perpendicular to the rotation axis 7, and the extended tangent line 14 of the inner end point faces the rotation direction more than the straight line 15 that connects the inner end point and the rotation axis. The extended tangent line 16 of the end point is directed in the opposite direction of rotation from the straight line 17 connecting the outer end point and the rotation axis.

  In the above configuration, when the operation starts and the electric motor rotates, the impeller 9 rotates through the shaft 8. Along with the rotation, air is sucked from the lower side of the impeller 9 through the main plate 11 and from the upper side of the impeller 9 through the side plate 13, and the air pressurized by the impeller 12 is blown from the impeller 9 toward the substantially horizontal periphery. Will be. The flow passing through the impeller can increase the wind speed by suppressing the occurrence of turbulence 18 at the outer peripheral end of the impeller due to the rectifying effect of the main plate 11 and the side plate 13.

  FIG. 3 shows the air blowing performance of the impeller having the flat main plate 11 and the side plate 13 which are the simplest shapes. The total of the upper and lower circles calculated from the outer diameter of the blades. Sin / Sc, which is the ratio of the total area Sin of the holes of the main plate and the side plate to the area Sc, and a reach distance ratio of a wind speed of 0.4 m / s at which a person can feel an air current (Sin / not including the main plate and the side plate) In relation to the reach distance when Sc = 1, the main plate 11 has Sin / Sc of 0.6 or more regardless of the ratio D / H represented by the blade height H and the blade outer diameter D. In the first embodiment, since the main plate 11 and the side plate 13 each have a hole with a diameter of 130 mm, the Sin is shown in FIG. The total area of the two holes, Sin / Sc is 0.8 Which is configured to, airflow reach the main plate 11, as compared with the case side plate 13 is not increased about 10% wind speed at the same length position increases.

  Further, by defining the shape of both end portions of the blade 12, the inner end shape of the vane plate 12 takes in air with little loss in accordance with the inflow of air, and the outer end shape increases the ratio of work to the load. The high-efficiency impeller 9 has the effect of increasing the wind speed.

  In addition, since the main plate 11 and the side plate 13 sandwich the blade 12, sufficient strength can be ensured compared to the case where the blade 12 is supported only by the main plate 11, and the expansion of the blade 12 due to centrifugal force, etc. Can be suppressed.

  Further, since the electric motor and the impeller 9 are provided on the stand and can be placed on an arbitrary floor, the electric fan is easy to carry and move.

In Reference Embodiment 1, since the main plate 11 and the side plate 13 are flat, the Sin / Sc is 0.6 or more, and the main plate 11 and the side plate 13 increase the wind speed. However, the main plate 11 and the side plate 13 are curved. By reducing the loss at the time of air inflow, the wind speed can be increased even if Sin / Sc is 0.6 or less. Therefore, when it is desired to increase the strength of the impeller 9, the annular main plate 11, The inner diameter of the side plate 13 can be further reduced.

  In addition, the blowout from the impeller 9 forms a main flow in the horizontal direction with the floor surface, but it may be provided with a turning means in the blow flow axial direction, and the person can be surely cooled by changing the wind direction. In addition to the effect, it is possible to function as an effective circulator by setting the wind direction in accordance with the cooling and heating when using the air conditioner.

  Further, although the impeller 9 is exposed, a guard that protects the impeller may be provided around the impeller, preventing contact of other objects with the rotating impeller, and the impeller at the time of the fall. Damage can be prevented.

( Reference form 2)
The same parts as those in Reference Embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 4 is a perspective view of the electric fan according to Reference Embodiment 2 of the present invention, and FIG. 5 is a cross-sectional view passing through the rotation shaft 7 of the fan impeller.

  As shown in these drawings, the electric fan 1 according to the present invention includes a case portion 4 that supports an electric motor (not shown) and a guard portion 20 that protects an impeller at an upper portion of a stand 6. The electric motor is connected to an impeller 9 through a shaft 8, and the impeller 9 has an annular main plate 11, a side plate 13, and a main plate that have a smooth tapered shape 19 with no nozzle corners toward the outside in the axial direction. 11 and a slat 12 fixed by being sandwiched between side plates 13. The guard portion 20 is connected to the guard portion 20 in the axial direction, and is connected to the lattice 21 to the extent that ventilation is possible and prevents foreign matter from entering, the curved orifice portion 22 provided on the outer side in the axial direction of the main plate 11 and the side plate 13, respectively. It is comprised from the wind direction control board 23 used as the cylindrical direction change means which covers the perimeter of a part of impeller shaft direction which slides in the direction.

  In the above configuration, the impeller 9 rotates and sucks up and down air of the impeller 9, and is blown to the surroundings through the orifice portion 22, the main plate 11 or the side plate 13, the vane plate 12, and the guard portion 20. Here, the suction diverted flow 24 in which the suction flow sucked into the impeller 9 is turned into an axial flow passing between the main plate 11 and the side plate 13 is smooth without the corners of the orifice portion 22 and causing vortices. The curled flow in the impeller 25 rectified by a curved surface and redirected by the impeller in the centrifugal direction inside the impeller 9 does not have an angle that causes a nozzle-like vortex between the main plate 11 and the side plate 13. Since the flow is guided by a smooth curved surface, the vortex 26 at the time of turning is suppressed and the suction resistance is reduced, so that the wind speed is increased.

  In addition, since the main flow is formed inside the impeller 9 toward the portion not covered with the wind direction control plate 23 due to the presence of the wind direction control plate 23, the blowing direction can be controlled, and the wind direction control plate 23 is made movable. By doing so, in addition to the effect of surely cooling the person, it is possible to have a function as an effective circulator by setting the wind direction according to the cooling and heating when using the air conditioner together. Furthermore, since the wind direction control plate 23 can be configured with a thin structure, an increase in volume can be avoided.

In Reference Mode 2, the guard portion 20 is provided, but the effect of increasing the wind speed is obtained by the main plate 11 and the side plate 13 regardless of the presence or absence. In this case, the pressure loss when passing through the guard portion 20 is eliminated. Therefore, the wind speed and the airflow arrival distance are increased as compared with the case where the guard unit 20 is provided.

  Moreover, the orifice part 22 is provided in both directions of the main plate 11 and the side plate 13, and the inside of the main plate 11 and the side plate 13 has a nozzle-like smooth tapered shape 19, but it is desirable to avoid a slight volume increase of the fan 1. In addition, the effect can be obtained with only one orifice portion 22 and the tapered shape 19, and as shown in FIG. 6, the sectional shape passing through the rotating shaft 7 is not the orifice portion 22 or the tapered shape 19, but the axial direction of the impeller 9. Even if a semicircular shape that protrudes outward is used, the flow is guided by a smooth curved surface with no semicircular corners when the flow is changed to an axial flow when passing through the main plate 11 and the side plate 13. Therefore, the turbulent diverted flow 27 inside the main plate 11 or the side plate 13 becomes a rectified diverted flow 28, and the vortex generated at the time of the diversion is suppressed, the suction resistance is reduced, and the wind speed and the airflow reaching distance can be increased. It becomes. Incidentally, in FIG. 6, a semicircular shape is formed with an arc having a radius of about 7 mm with respect to the inner diameter of the 300 mm impeller 9.

  Moreover, although the wind direction control board 23 is movable, when it is not necessary to change the direction of the blowing flow, the configuration can be simplified by fixing it.

(Embodiment 1 )
The same parts as those in Reference Embodiments 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 7 is a perspective view of the electric fan according to Embodiment 3 of the present invention, and FIG. 8 is a cross-sectional view passing through the rotation shaft 7 of the impeller of the electric fan.

  As shown in these drawings, the outer rotor motor 29 is supported on the case 4 at the top of the support column 5, and the shaft support 10 of the main plate 11 is directly attached to the rotor 30 to rotate the impeller 9. . The impeller 9 has an outer diameter of 300 mm, an inner diameter 31 of the main plate is 240 mm, an inner diameter 32 of the side plate is 260 mm, and the inner side of the side plate 13 is smooth without a corner in a nozzle shape toward the outer side of the rotating shaft 7. It has a tapered shape 19.

  Further, a fragrance 34 as an additional function is provided at the tip of the stator 33 of the motor 29 of the outer rotor in the space inside the impeller 9 in which the vane plate 12 is annularly arranged around the rotation shaft 7.

  In the above configuration, the impeller 9 is rotated by the rotation of the electric motor 29 of the outer rotor, and air is sucked into the main plate 11 and the side plate 13 that serve as an inlet to the impeller 9, and is moved to the surroundings by the vane plate 12. Be blown. Here, the side plate 13 has a tapered shape 19 with respect to the flat main plate 11 to reduce the suction loss, and the inner diameter 32 of the side plate is also larger than the inner diameter 31 of the main plate. Since the inflow area at the side plate 13 is increased, the amount of inflow from the side plate 13 is increased. When the inflow amount of one of the main plate 11 and the side plate 13 increases, the blown air generates an induced air flow 41 toward the suction side where the inflow amount is large, and the main flow is directed in the direction where the inflow amount is large. The blowing direction will be changed.

  Further, since the outer rotor motor 29 is provided, a stationary body can be fixed inside the impeller 9. Here, since the fragrance 34 that diffuses the scent of the herb is provided at the tip of the stator 33, it is possible to obtain the effects of both air blowing and fragrance. Fulfill.

In the first embodiment, the inner diameter 31 of the main plate is different from the inner diameter 32 of the side plate. However, since the inflow area from the main plate 11 and the side plate 13 may be changed, the blowout flow can be achieved by arbitrarily closing the hole. This change is possible.

  Further, although the inflow areas from the main plate 11 and the side plate 13 are fixed differently, the area variable structure 35 may be used as shown in FIG. The variable area structure 35 is made possible by varying the area by, for example, overlapping the rotating plate 37 on the stationary plate 36 having a radial slit and changing the overlapping amount of the slit by shifting the angle of the rotating plate 37.

  The area of the main plate 11 may be larger than that of the side plate 13. In this case, the wind direction is directed toward the main plate 11, so that the effective wind direction depends on the installation height of the impeller 9 and the air blowing target area. Can be determined.

  Although the fragrance 34 is provided as an additional function, it may be a silica gel dehumidifier or an electric negative ion generator, and since air is circulated by the impeller 9, it plays an effective role. Further, by providing illumination as an additional function, it is possible to obtain light in addition to the air blowing function.

(Embodiment 2 )
The same parts as those in Embodiment 1 and Reference Embodiments 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 10 is a perspective view of the electric fan according to Embodiment 2 of the present invention.

  As shown in FIG. 10, the electric fan of the present invention has a blade 4 fixed to a motor (not shown) provided on the case portion 4 with a main plate 11 by connecting the case portion 4 to a column portion 5 attached to a ceiling 38. It comprises a car 9 and a guard part 20 that is connected to the case part 4 and protects the impeller 9. The impeller 9 is composed of a blade plate 12 that is annularly arranged on the lower surface side of the main plate 11 and a side plate 13 that is connected to the lower end of the blade plate 12, and the guard portion 20 is from a central portion on the opposite side to the case portion 4. An impeller fixing portion 39 is provided toward the inside of the impeller, and an illumination 40 as an additional function is provided.

  In the above configuration, when the operation is started by the wall switch attached via the remote controller or the ceiling, the vane plate 12 is rotated by the electric motor and the air in the vertical direction is sucked to blow around the vane plate 12. Here, since the impeller 9 is suspended from the ceiling, it can be blown without occupying the floor and taking up space, and can be used as a circulator. Moreover, since the illumination 40 is provided in the inside of the impeller 9, it serves not only as a fan but also as illumination.

In the second embodiment, the fan 40 suspended from the ceiling 38 is provided with the illumination 40. However, the lamp 40 may be provided inside the stand-shaped fan to serve as a stand illumination. Although the illumination 40 is provided, it may be a dehumidifying agent, a fragrance, or a negative ion generator, and since air is circulated by the impeller 9, it plays an effective role.

  Moreover, although it is a structure which blows in the horizontal direction from the slat 12 in a state of being suspended from the ceiling 38, it may be provided with a direction changing means in the direction of the blowing flow axis. In addition to the effect of reliably cooling the air, it is possible to function as an effective circulator by setting the air direction according to the air conditioning when the air conditioner is used together.

  The electric fan according to the present invention can improve the air blowing capability to a distant place by increasing the initial speed in the vicinity, and the electric fan capable of reducing the area of the movable range by making the space inside the impeller not be the movable range of the impeller. Useful as.

The perspective view of the fan of the reference form 1 of this invention Top view of an impeller of a reference in the form 1 fan of the present invention The figure which shows the ventilation performance of the fan of the reference form 1 of this invention The perspective view of the fan of the reference form 2 of this invention Sectional drawing of the impeller of the fan of the reference form 2 of this invention Supplementary cross-sectional view of the impeller of the fan according to Reference Embodiment 2 of the present invention The perspective view of the electric fan of Embodiment 1 of the present invention Sectional drawing of the impeller of the electric fan of Embodiment 1 of this invention Supplementary perspective view of electric fan according to Embodiment 1 of the present invention The perspective view of the electric fan of Embodiment 2 of the present invention Side view showing a conventional ceiling fan

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fan 2 Operation part 3 Base part 4 Case part 5 Support | pillar part 6 Stand 7 Rotating shaft 8 Shaft 9 Impeller 10 Shaft support 11 Main plate 12 Blade plate 13 Side plate 14 Extension tangent of inner end point 15 Straight line connecting inner end point and rotating shaft 16 Extension tangent line of outer end point 17 Straight line connecting outer end point and rotation axis 18 Disturbance of outer peripheral end portion of impeller 19 Tapered shape 20 Guard portion 21 Grid 22 Orifice portion 23 Wind direction control plate 24 Suction direction change flow 25 Impeller direction change flow 26 Vortex at turning 27 Disturbed turning flow 28 Rectified turning flow 29 Motor of outer rotor 30 Rotor 31 Inner diameter of main plate 32 Inner diameter of side plate 33 Stator 34 Air freshener 35 Area variable structure 36 Stationary plate 37 Rotating plate 38 Ceiling 39 Impeller fixed part 40 Illumination 41 Induced air flow 42 Semicircular shape Sc Total area of circle Sin Total surface of hole H impeller height D slats OD 101 fan main body 102 sets 103 struts 104 blower 105 operating section 106 case portion 107 cover 108 rotates shaft 109 impeller 110 windbreak portion

Claims (11)

An electric fan having an electric motor whose axis of rotation is perpendicular to the ground, and an impeller connected to the electric motor that rotates coaxially with the electric motor and blows air to 360 degrees in the centrifugal direction. An annular main plate connected to the electric motor, a plurality of blades provided annularly on the outer peripheral surface of the main plate, and an annular side plate sandwiching the blades facing the main plate ,
The impeller is provided with a means for changing the direction of the outlet flow axis,
An electric fan characterized in that the area of the hole in the main plate and the side plate is different . The tangential extension line of the inner end point in the vertical cross-sectional shape of the slats is oriented in the rotational direction from the straight line connecting the inner end point and the rotation axis, and the extended tangent line of the outer end point rotates more than the straight line connecting the outer end point and the rotation axis. The electric fan according to claim 1, wherein the electric fan is directed in the opposite direction. The electric fan according to claim 1 or 2, wherein the ratio of the total area of the holes of the main plate and the side plate to the area of the circle calculated from the outer diameter of the blade plate is 0.6 or more. The fan according to any one of claims 1 to 3 , wherein an edge of one or both of the main plate and the side plate is smoothly tapered in a nozzle shape toward the outside in the axial direction of the impeller. Claim 1 which is characterized by a semicircular cross section passing through the axis of rotation of the edges of one or both of the hole of the main plate and the side plate is convex toward the outside in the axial direction of the impeller to either the 4 The listed fan. The electric fan according to any one of claims 1 to 5 , further comprising a guard that protects the impeller around the impeller. The electric fan according to claim 6 , further comprising an orifice for guiding airflow smoothly through the guard on an axially outer side of the impeller on one side or both sides of the main plate and the side plate. The electric fan according to claim 6 , further comprising an additional function other than air blowing fixed inside the impeller through a guard on a side opposite to the electric motor. The motor according to any one of claims 1 to 7 , further comprising an additional function other than air blowing, wherein the motor is an outer rotor motor, the impeller is connected to the rotor, and the stator is fixed to a stator tip inside the impeller. Fan. The electric fan according to any one of claims 1 to 9 , wherein an electric motor is fixed to a stand apex portion having a base portion, a column portion, and a case portion, and an impeller is provided above the electric motor. The electric fan according to any one of claims 1 to 9 , wherein the electric motor is fixed by providing a case portion on a support or wire suspended from the indoor ceiling, and an impeller is provided below the electric motor.

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