JP2018053718A - Ceiling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling fan for restraining deterioration of efficiency of an operation performed by blades of a ceiling fan.SOLUTION: A blade 7 has an inner periphery 8 on a stationary shaft 3 side of the blade 7, and an outer periphery 9 nearer an outer circumference than the inner periphery 8. The blade has such a shape that a front edge distance 15 gets bigger toward the outer circumference of the blade 7 and a rear edge distance 16 is constant or gets bigger. The outer periphery 9 has such a shape that a rear edge 12 approaches a front edge 11 toward the outer circumference of the blade 7. Therefore, an area of a blade tip for generating a blade tip vortex can be reduced, and efficiency deterioration of an operation performed by the blade can be restrained.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a ceiling fan used mainly by being attached to a ceiling surface.

  Conventionally, this type of ceiling fan has the following configuration. That is, a pipe portion that can be engaged with the ceiling, a motor portion provided at the lower portion of the connecting portion, a support portion that is rotatably provided at the periphery of the motor portion, and a plurality of detachably provided on the support portion The blade part is composed of a metal blade part, and the blade part includes a root part fixed to the support part, a wing part that blows air as the support part rotates, and the root part and the wing part. The wing portion formed between the wing portion and the step portion which is inclined from the horizontal is formed, and the wing portion is bent downward toward the downstream side in the rotation direction of the wing portion. And it became the structure provided with the some reinforcement part in the center of the blade | wing part.

  For example, a similar prior document is described in Patent Document 1 below.

JP 2009-121243 A

  However, the ceiling fan described in Patent Document 1 has a problem that the number of manufacturing steps is increased as compared with the case where the reinforcing portion is not provided because the reinforcing portion is provided in order to improve the strength of the blade portion. In order to improve the strength of the blade without providing the reinforcing portion, it can be considered that the bending rate of the bent portion is reduced to provide an effect like a bead. However, generally, when the blade shape changes sharply, the flow along the blade is peeled off and energy loss occurs, so that the work efficiency performed by the blade decreases. In other words, in order to give the blade a bead-like effect, there is a problem that it is necessary to make the blade shape more efficient.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a ceiling fan that improves the efficiency of work performed by blades.

  In order to achieve the above object, the present invention achieves the above-described object, an attachment means that can fix one end of the fixed shaft to the ceiling surface, an electric motor that rotates a rotating portion that is arranged on the outer periphery around the fixed shaft, and the rotation A ceiling fan in which the blades rotate together with the rotating portion and blows air, and the blades are located on the inner peripheral portion on the fixed shaft side and on the outer peripheral side with respect to the inner peripheral portion. An outer peripheral portion, and the inner peripheral portion includes a midpoint of a straight line connecting a front edge and a rear edge of the attachment portion to the rotating portion and the fixed shaft in the projection of the blade in the fixed axis direction. When a line segment is a center line, the leading edge distance and the trailing edge distance, which are the distances from the point on the center line to the leading edge and the trailing edge in the vertical direction, are directed toward the outer periphery of the blade. The leading edge distance is large and the trailing edge distance is constant The outer peripheral portion has a shape in which the front edge of the inner peripheral portion is extended, and the rear edge of the inner peripheral portion approaches the front edge of the outer peripheral portion as it goes toward the outer periphery of the blade. The ceiling fan is characterized in that it has a desired purpose.

  According to the present invention, a decrease in blade efficiency can be suppressed.

Configuration schematic diagram of ceiling fan according to Embodiment 1 of the present invention Schematic view of ceiling fan blades according to Embodiment 1 of the present invention Schematic diagram of ceiling fan blade according to Embodiment 2 of the present invention Conceptual view of blades of ceiling fan according to Embodiment 2 of the present invention

A ceiling fan according to claim 1 of the present invention is a mounting means capable of fixing one end of a fixed shaft to a ceiling surface, an electric motor rotating a rotating portion arranged around the fixed shaft, and the rotating portion. A ceiling fan in which the blades rotate together with the rotating part and blows air. The blades are arranged on the outer peripheral side of the fixed shaft side and on the outer peripheral side of the inner peripheral part. The inner peripheral portion includes a straight midpoint connecting a front edge and a rear edge of the portion attached to the rotating portion and the fixed shaft in the projection of the blade in the fixed axis direction. When the minute is the center line, the leading edge distance and the trailing edge distance, which are the distances from the point on the center line to the leading edge and the trailing edge in the vertical direction, respectively, move toward the outer periphery of the blade as described above. The leading edge distance increases and the trailing edge distance is constant or large. The outer peripheral portion has a shape in which the front edge of the inner peripheral portion is extended, and the rear edge of the inner peripheral portion approaches the front edge of the outer peripheral portion as it goes toward the outer periphery of the blade. It is.

  Accordingly, the outer peripheral portion has a shape in which the rear edge approaches the front edge as it goes toward the outer periphery. With this shape, the ratio of the blades occupying on the same circumference at the furthest position on the blade from the fixed shaft is reduced compared to the inner peripheral side, thereby reducing the region for generating the tip vortex at the blade tip. be able to. In other words, the airflow that has caused vortices on the circular orbit of the outer periphery of the blade can be caused to act in the axial direction as the airflow on the trailing edge side of the blade. Therefore, the work loss of the blades can be reduced, and the air volume can be secured with less power consumption.

  In the ceiling fan according to claim 2, the inner peripheral portion has a shape in which the increasing rate of the trailing edge distance is larger than the increasing rate of the leading edge distance.

Thereby, the inner peripheral part has a shape in which the increasing rate of the trailing edge distance is larger than the increasing rate of the leading edge distance. In other words, of the angles formed by the center line and the leading edge, and the center line and the trailing edge, if the acute angle is the leading edge angle and the trailing edge angle, respectively, the trailing edge angle is larger. Yes. Thereby, even if it is the same chord length, the disturbance which arises from the wake of an inner peripheral part can be suppressed by setting it as this shape. Therefore, the air volume can be secured efficiently.
(Embodiment 1)
As shown in FIG. 1, the ceiling fan 1 of the present embodiment is attached to a ceiling surface 2.

  Such a ceiling fan 1 includes an electric motor 5 in which a rotating unit 4 arranged on the outer periphery around a fixed shaft 3 rotates, an attachment means 6 that can fix one end of the fixed shaft 3 to the ceiling surface 2, and a rotating unit. 4 and a plurality of blades 7 fixed to 4, and the blades 7 rotate together with the rotating unit 4 to blow air.

  As shown in FIG. 2, in the ceiling fan 1, the blade 7 has an inner peripheral portion 8 on the fixed shaft 3 side of the blade 7 and an outer peripheral portion 9 on the outer peripheral side of the inner peripheral portion 8.

  The inner peripheral portion 8 is centered on a line segment including the midpoint 13 of the straight line connecting the front edge 11 and the rear edge 12 of the attachment portion 10 to the rotating portion 4 and the fixed shaft 3 in the projection of the blade 7 in the direction of the fixed shaft 3. When the line 14 is used, the leading edge distance 15 and the trailing edge distance 16 from the center line 14 to the leading edge 11 and the trailing edge 12 in the vertical direction are respectively increased toward the outer periphery of the blade 7. The trailing edge distance 16 has a constant or large shape.

  The outer peripheral portion 9 has a shape such that the rear edge 12 approaches the front edge 11 as it goes toward the outer periphery of the blade 7. In other words, the farthest portion 17 that is the farthest position on the blade 7 from the fixed shaft 3 has a shape that is located closer to the front edge 11 than the rear edge 12. Thereby, since the ratio of the blade | wing occupied on the same periphery of the position farthest on the blade | wing 7 from the fixed axis | shaft 3 can be made small compared with an inner peripheral side, the area | region which produces | generates the blade tip vortex of a blade | wing front-end | tip part is made. Can be small. In other words, the generation of the blade tip vortex can be suppressed by causing the outer periphery of the blade 7 to act as the wake side of the blade in a region parallel to the rotation direction and acting as the blade tip. Therefore, the work loss of the blades can be reduced, and the air volume can be secured with less power consumption.

  As described above, the air flow rate can be efficiently secured by forming the outer peripheral portion 9 in such a shape that the rear edge 12 approaches the front edge 11 toward the outer periphery of the blade 7.

(Embodiment 2)
A ceiling fan according to the second embodiment will be described.

  As shown in FIG. 3, the inner peripheral portion 8 has a shape in which the increasing rate of the trailing edge distance 16 of the blade 7 is larger than the increasing rate of the leading edge distance 15. In other words, of the angles formed by the center line 14 and the leading edge 11 and the trailing edge 12, if the acute angles are the leading edge angle 18 and the trailing edge angle 19, respectively, the trailing edge angle 19 becomes larger. doing. Here, as shown in FIG. 4, the increase rate is defined as a front edge distance 15a and a rear edge distance 16a in the attachment portion 10, and a front edge distance 15b and a rear edge distance 16b at a position away from the attachment portion 10 by a distance R. The increase rate of the leading edge distance is obtained by (15b-15a) / R, and the increase rate of the trailing edge distance is obtained by (16b-16a) / R. By adopting such a shape, even if the chord length is the same, it is possible to suppress the turbulence generated from the wake of the inner peripheral portion 8 by using this shape. Therefore, the air volume can be secured efficiently.

  As described above, the inner peripheral portion 8 can efficiently secure the air volume by making the increase rate of the trailing edge distance 16 of the blade 7 larger than the increase rate of the leading edge distance 15.

  The present invention is useful as a technique expected to be used as a ceiling fan for home use or office use.

DESCRIPTION OF SYMBOLS 1 Ceiling fan 2 Ceiling surface 3 Fixed shaft 4 Rotating part 5 Electric motor 6 Mounting means 7 Blade 8 Inner peripheral part 9 Outer peripheral part 10 Attaching part 11 Front edge 12 Rear edge 13 Midpoint 14 Center line 15 Front edge distance 16 Farmost part 18 Leading edge angle 19 Trailing edge angle

Claims (2)

Mounting means capable of fixing one end of the fixed shaft to the ceiling surface;
An electric motor in which a rotating part arranged on the outer periphery around the fixed shaft rotates;
A ceiling fan that includes a plurality of blades fixed to the rotating unit, and the blade rotates together with the rotating unit and blows air;
The blade has an inner peripheral portion on the fixed shaft side, and an outer peripheral portion on the outer peripheral side than the inner peripheral portion,
The inner periphery is
In the projection in the fixed axis direction of the blade, when the line segment including the fixed axis and the midpoint of the straight line connecting the front edge and the rear edge of the attachment portion to the rotating part is the center line, The leading edge distance and the trailing edge distance, which are the respective distances from the point to the leading edge and the trailing edge in the vertical direction, increase toward the outer periphery of the blade, and the leading edge distance increases, and the trailing edge distance is Have a constant or larger shape,
The outer peripheral portion is a ceiling fan having a shape in which a front edge of the inner peripheral portion is extended, and a rear edge of the inner peripheral portion approaches a front edge of the outer peripheral portion toward the outer periphery of the blade. The inner peripheral portion has a shape in which the trailing edge distance increases toward the outer periphery of the blade, and the increasing rate of the trailing edge distance is larger than the increasing rate of the leading edge distance. Ceiling fan.