JP5228694B2 - Ceiling fan - Google Patents

Description

  The present invention mainly relates to a ceiling fan used by being suspended from an indoor ceiling surface.

  Conventionally, this type of ceiling fan is widely known in which one end of a plurality of blades is fixed to a motor and is cantilevered (see, for example, Patent Document 1).

Hereinafter, the ceiling fan will be described with reference to FIGS. 9 and 10. As shown in FIG. 9, the blade 101 includes an attachment portion 103 for fixing to the electric motor 102 and a wing portion 104 that generates lift, and the attachment portion 103 holds the wing portion 104 at an angle from a horizontal plane. An inclined surface 105 for fixing, two mounting holes 106 for fixing to the electric motor 102, and a cylindrical portion 107 for improving rigidity are integrally formed on the peripheral edge. As shown in FIG. 10, a plurality of blades 101 are attached to a support frame 109 provided on the outer periphery of the rotor 108 of the electric motor 102 using screws 110.
Japanese Utility Model Publication No. 3-30599 (FIGS. 1 and 2)

  In such a conventional ceiling fan, a difference occurs in the rigidity on both sides of the center line in the radial direction of the slats due to the inclined surface of the mounting portion, and the rigidity on the side where the level difference due to the inclined surface is small is reduced. When a load is applied to the blades during operation or stop, the amount of deformation is biased due to the difference in rigidity, and the stress distribution is not uniform on both sides of the center line, and the stress generated on the side with a small step due to the inclined surface increases. Since stress is biased and concentrated on one side, the maximum stress increases, and there is a problem that it tends to be damaged by long-term use.

  The present invention solves such a conventional problem, and since the maximum stress can be reduced by equalizing the stress distribution generated with respect to the load applied to the blade plate and eliminating the bias, the blade plate is damaged. An object is to provide a ceiling fan that is difficult to reach and has improved safety.

In order to achieve the above object, the ceiling fan according to the present invention has a plurality of metal blades arranged on an electric motor whose rotation axis is held perpendicular to the ceiling surface, and the blades are fixed to the electric motor. It consists of a base part and a wing part that generates lift by the rotation of the electric motor, and the base part is formed with an inclined surface for holding the wing part at an angle from the horizontal plane in the rotational circumferential direction of the electric motor and which, by providing asymmetrically with respect to the radial direction center line of the motor reinforcing ribs on the base portion, can reduce the maximum stress in the stress is dispersed averaged.

  According to the present invention, by providing the reinforcing ribs asymmetrically with respect to the center line in the radial direction of the motor, the maximum stress can be reduced by equalizing the stress distribution generated with respect to the load applied to the blades and eliminating the bias. Therefore, it is possible to provide a ceiling fan in which the blades are less likely to be damaged and the safety is improved.

In the ceiling fan according to claim 1 of the present invention, a plurality of metal blades are arranged in an electric motor whose rotation axis direction is held perpendicular to the ceiling surface, and the blade plates are fixed to the electric motor. It consists of a wing part that generates lift by the rotation of the electric motor, and an inclined surface is formed at the base part for holding the wing part in an angled state from the horizontal plane in the rotation circumferential direction of the electric motor. The base portion is provided with reinforcing ribs asymmetrically with respect to the center line in the radial direction of the motor , and the maximum stress can be reduced by dispersing and averaging the stress.

The ceiling fan according to claim 2 of the present invention is the ceiling fan according to claim 1, wherein the reinforcing rib is formed of a plurality of beads at the apex along the radial center line of the electric motor. And, it has the effect that the metal base can be easily processed.

The ceiling fan according to claim 3 of the present invention is the ceiling fan according to claim 2 , characterized in that the reinforcing rib has at least two cross-sectional shapes, and is easily rigid with the same processing area. It has the effect that different reinforcing ribs can be formed.

The ceiling fan according to claim 4 of the present invention is the ceiling fan according to claim 2, wherein the reinforcing ribs have the same cross-sectional shape, and the apparent reinforcing rib shape is the same. Has the effect of being aesthetically pleasing.

The ceiling fan according to claim 5 of the present invention is characterized in that, in the ceiling fan according to claim 4 , the height of the cross-sectional shape of the reinforcing rib is changed, and the apparent processing area is the same. However, the reinforcing ribs having different rigidity can be easily formed.

The ceiling fan according to claim 6 of the present invention is the ceiling fan according to claim 4 , characterized in that the reinforcing rib changes the width of its cross-sectional shape, and the height of the reinforcing rib is the same. By being able to do so, it is possible to make vortex generation by blowing air constant and to suppress generated noise and the like.

The ceiling fan according to claim 7 of the present invention is the ceiling fan according to claim 4 , wherein the length of the reinforcing rib is changed, and the cross-sectional shape of the beads to be formed can be made the same. Therefore, it has the effect that the man-hour for manufacturing the mold for processing can be simplified.

The ceiling fan according to claim 8 of the present invention is the ceiling fan according to claim 4 , wherein the number of reinforcing ribs arranged on both sides of the radial center line of the electric motor is different. In addition to the cross-sectional shape of the bead to be made, the length can be made the same, so that the man-hours for manufacturing the mold can be further simplified.

A ceiling fan according to a ninth aspect of the present invention is the ceiling fan according to any one of the fourth to eighth aspects, wherein the cross-sectional shape of the reinforcing rib is a quadrangle, which is more than the other cross-sectional shapes. Since the degree of improvement in rigidity is high, there is an effect that an area to be processed for forming a bead can be reduced.

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

(Embodiment 1)
1 is a side sectional view of a main part of a ceiling fan according to Embodiment 1 of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a front view of a blade, FIG. 4 (a) is an enlarged view of a root portion, and FIG. (B) is sectional drawing in the cross section AA of a root part.

  As shown in FIGS. 1 and 2, the electric motor 1 of the ceiling fan includes a disk-shaped stator 2 at the center and an annular rotor 3 provided in the vicinity of the periphery of the stator 2. The support frame 4 is fixed to the peripheral edge of the metal frame, and a plurality of metal blades 6 are detachably disposed on the support frame 4 with screws 5.

  As shown in FIG. 3, the vane plate 6 is formed by joining a root portion 7 fixed to the support frame 4 of the electric motor 1 and a wing portion 8 that generates lift by the rotation of the electric motor 1 by three rivets 9. Yes. Bonding with the rivet 9 has good workability, and has the advantage that the residual strain after processing is small compared to spot welding and the like, and the bonding strength can be obtained stably. In addition, since the number is plural, even if one place is broken due to some factor, the root portion and the wing portion can maintain the joint.

As shown in FIG. 4 (a), the root portion 7 is formed from a single sheet material by press working, and the screw hole 10 for fixing to the support frame 4 of the electric motor 1 is a radial center line of the electric motor 1. 11
2 are provided near both ends in the rotational circumferential direction that is symmetrical to each other, and inclined surfaces 12 are formed to hold the wing portion 8 in an angled state in the rotational circumferential direction of the electric motor 1 from the horizontal plane. ing. The inclined surfaces have different two curved portions 13 of the bending direction, each of the bending angle is 60 degrees if example embodiment. Since the bending angle can be alleviated stress concentration and deviation generated at the curved portion 13 by the same, stress is reduced in the dispersion. The root portion 7 is formed with reinforcing ribs 14 having a plurality of beads whose apexes along the radial center line 11 of the electric motor 1.

  As shown in FIG. 4B, the cross-sectional shape of the surface of the reinforcing rib 14 perpendicular to the radial center line 11 of the electric motor 1 is a quadrangle, and the cross-sectional shape has a width W, a height H, and a length. For example, the width w is 5 mm, the length l is 80 mm, and the height h is 3 mm to 4.5 mm. For example, the number of the reinforcing ribs 14 is changed so that the level difference due to the inclined surface 12 is lower. Are arranged at equal intervals with two center lines symmetrically. In addition, when arrange | positioning the reinforcement rib 14, you may arrange | position one piece on the radial direction centerline 11 of an electric motor, and the same number on both sides. In this way, the height of the reinforcing rib 14 is changed to provide an asymmetric arrangement with respect to the radial center line 11 of the electric motor 1.

  In the above configuration, the load acting on the blade 6 is a gravity load acting on the mass of the blade 6 itself regardless of the start / stop of the motor 1, and a centrifugal force or lift force acting on starting and rotating the motor 1. However, since the blade plate 6 is made of metal and has a large mass, the blade plate 6 receives the maximum load when only the gravity load acts when the electric motor 1 is stopped.

  It is known that when the slat 6 is subjected to a gravitational load, it is greatly deformed so as to hang vertically downward with the root portion 7 as a fulcrum, so that maximum stress is generated in the vicinity of the screw hole 10 of the root portion 7. The inclined surface 12 of the root portion 7 causes a difference in rigidity on both sides where the radial center line of the electric motor 1 is symmetric, and the rigidity on the large step side due to the inclined surface 12 is increased, but the reinforcing ribs 14 are disposed asymmetrically. Since the height h of the reinforcing rib 14 is low on the side where the level difference is large, the difference in rigidity can be canceled and made uniform. By equalizing the rigidity, the stress of the root portion 7 on both sides is not biased, and the maximum stress of the root portion 7 can be reduced. As a result, it is possible to obtain an effect that the vane plate 6 is not easily damaged even when it is used repeatedly for a long time.

  In addition, although the cross-sectional shape of the reinforcing rib 14 is a quadrangle, the cross-section coefficient per the same processing area is large compared to other shapes of triangles and semi-circles that can be formed, so the processing area for obtaining equivalent rigidity is reduced. can do. As a result, the effect that processing cost can be reduced is obtained.

( Reference form 1 )
Fig.5 (a) is an enlarged view of the base part of the blade of the reference form 1 , FIG.5 (b) is sectional drawing in the cross section AA of the base part. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5 (a), the root portion 7 is wider than the wing portion 8, and the generated sectional area of the root portion that receives the acting load increases, so that the generated stress is reduced. Moreover, one screw hole 10 for fixing to the support frame 4 of the electric motor 1 is added to make a total of three locations. The added screw hole 15 is provided on the radial center line 11 of the electric motor 1. By increasing the number of fixing points, the stress generated at the screw hole position can be dispersed and reduced.

  Moreover, as shown in FIG.5 (b), the cross-sectional shape of the reinforcement rib 14 of the root part 7 is a semicircle, for example, height H is 5 mm, length L is 60 mm, and width W is 12 mm-18 mm and an inclined surface. 12 is changed so as to be narrowed on the side where the step is large. In this way, by changing the width of the reinforcing rib 14, the structure is provided asymmetrically with respect to the radial center line of the electric motor 1. In the above configuration, since the reinforcing ribs 14 are arranged asymmetrically, the difference in rigidity due to the level difference can be canceled and the rigidity can be made uniform. can do.

(Embodiment 2 )
FIG. 6A is an enlarged view of the root portion of the blade according to the second embodiment, and FIG. 6B is a cross-sectional view taken along a section AA of the root portion. The same parts as those in the first embodiment and the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 6A, the position of the screw hole 15 added for fixing to the support frame 4 of the electric motor 1 is on the radial center line 11 of the electric motor 1, and from the other two screw holes 10. Is also provided on the outer peripheral side of the electric motor 1 in the radial direction. Since the added screw hole 15 is on the outer peripheral side, the apparent distance from the fixed position of the blade to the end can be shortened. As a result, since a deformation | transformation at the time of a blade | wing receiving the load which acts at the time of an operation | movement and vibrating can be suppressed, the generated stress can be reduced.

  Further, as shown in FIG. 6 (b), the reinforcing rib 14 at the base portion has the same height H as 4 mm, width W as 6 mm, and length L as 60 mm, but the cross-sectional shape is changed. A semi-circular shape was arranged on the side with a large step, and two squares were arranged on the side with a small step. In the case of the same dimensions, it is known that the cross-sectional shape of the quadrilateral is larger than the semi-circular shape, and the rigidity of the reinforcing rib is increased when the cross-sectional factor is large.

  In this way, the cross-sectional shape of the reinforcing rib 14 is changed to provide an asymmetric configuration with respect to the radial center line of the electric motor 1.

  In the above configuration, since the reinforcing ribs 14 are arranged asymmetrically, the difference in rigidity due to the level difference can be canceled and the rigidity can be made uniform. can do.

(Embodiment 3 )
FIG. 7 is an enlarged view of the root portion of the blade according to the third embodiment. Incidentally, denoted by the same numerals for the embodiment 1-2 and the embodiment 1, the same parts of the reference embodiment, and detailed description thereof will be omitted.

  As shown in FIG. 7, the root portion 7 and the wing portion 8 are joined by three rivets, and the arrangement is provided at one location on the inner peripheral side in the radial direction of the electric motor 1 and two locations on the outer peripheral side. Two locations on the outer peripheral side are at the same radial position. Since the stress generated in the rivet 9 due to the load acting on the blade 6 increases on the outer peripheral side, the stress is dispersed and reduced by setting the number of rivets on the outer peripheral side to two.

  Further, the reinforcing rib 14 at the base portion has a quadrangular cross-sectional shape, a height h of 3 mm, a width w of 3 mm, and a length l of 90 mm, all of which are the same, for example, a large step due to an inclined surface. They were arranged with two on the side and three on the side with a small step. In this manner, the number of reinforcing ribs 14 is changed to provide an asymmetric configuration with respect to the radial center line of the electric motor 1.

  In the above configuration, since the reinforcing ribs 14 are arranged asymmetrically, the difference in rigidity due to the level difference can be canceled and the rigidity can be made uniform. can do.

(Embodiment 4 )
FIG. 8 is an enlarged view of the root portion of the blade according to the fourth embodiment. The same parts as those in Embodiments 1 to 3 and Reference Embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, the reinforcing rib 14 at the base portion has a quadrangular cross-sectional shape, a height h of 3 mm, a width w of 3 mm, and a length l of 70 to 80 mm. It is changed to be shorter. In this way, the length of the reinforcing rib 14 is changed to provide an asymmetric arrangement with respect to the radial center line of the electric motor 1.

  In the above configuration, since the reinforcing ribs 14 are arranged asymmetrically, the difference in rigidity due to the level difference can be canceled and the rigidity can be made uniform. can do.

Side sectional view of the main part of the ceiling fan according to the first embodiment of the present invention. Front view Front view of a blade according to Embodiment 1 of the present invention (A) The enlarged front view of the root part of Embodiment 1 of this invention, (b) Sectional drawing in the same cross section AA (A) The enlarged front view of the root part of the reference form 1 of this invention, (b) Sectional drawing in the same cross section AA (A) The enlarged front view of the root part of Embodiment 2 of this invention, (b) Sectional drawing in the same cross section AA The enlarged front view of the root part of Embodiment 3 of this invention The enlarged front view of the root part of Embodiment 4 of this invention Enlarged view of the root of the conventional ceiling fan Sectional view of the main part of a conventional ceiling fan

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Stator 3 Rotor 4 Support frame 5 Screw 6 Blade plate 7 Root part 8 Wing part 9 Rivet 10 Screw hole 11 Radial direction center line 12 Inclined surface 13 Curved part 14 Reinforcement rib 15 Added screw hole

Claims (9)

A plurality of metal blades are arranged in an electric motor whose rotation axis direction is held perpendicular to the ceiling surface, and the blade plates are separated from a root part fixed to the electric motor and a wing part that generates lift by the rotation of the electric motor. The base portion is formed with an inclined surface for holding the wing portion at an angle from the horizontal plane in the rotational circumferential direction of the electric motor, and a reinforcing rib is provided at the base portion in the radial direction of the electric motor. ceiling fan which is characterized in that provided asymmetrically with respect to the center line. Reinforcing ribs, ceiling fan of claim 1 wherein vertices along the radial center line of the motor is obtained by forming a plurality of beads. The ceiling fan according to claim 2 , wherein the reinforcing rib has at least two cross-sectional shapes. The ceiling fan according to claim 2 , wherein the reinforcing ribs have the same cross-sectional shape. The ceiling fan according to claim 4, wherein the height of the cross-sectional shape of the reinforcing rib is changed. The ceiling fan according to claim 4 , wherein the reinforcing rib changes a width of a cross-sectional shape thereof. The ceiling fan according to claim 4 , wherein the length of the reinforcing rib is changed. The ceiling fan according to claim 4 , wherein the number of reinforcing ribs arranged on both sides of a radial center line of the electric motor is different. The ceiling fan according to any one of claims 4 to 8, wherein the reinforcing rib has a square cross-sectional shape.

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