JP2018053778A - Ceiling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device of a ceiling fan capable of automatically preventing an unsafe state by stopping energization in a case when a blade is broken due to repeated application of load to the blade.SOLUTION: A ceiling fan includes a motor portion capable of being mounted on a ceiling, a supporting portion 5 rotated by the motor portion, a blade 6 mounted on the supporting portion, a drop prevention member 7 capable of being engaged with the blade and the supporting portion, and a safety switch for controlling energization to the motor portion. The blade has a root portion fixed to the supporting portion. When the blade is fixed to the supporting portion, the safety switch is energized, and the energization to the safety switch is stopped when the root portion is broken and the blade is moved, thus a safety device of the ceiling fan capable of automatically preventing an unsafe state can be provided.SELECTED DRAWING: Figure 3

Description

The present invention relates to a ceiling fan suspended from a ceiling.

  In a conventional ceiling fan, a motor unit that can be attached to the ceiling, a support frame that is rotated by the motor unit, a blade plate provided on the support frame, and a fall prevention member that can be engaged with the blade plate and the support frame And the slat includes a root portion fixed to the support frame. A through-hole through which the fall prevention member passes is provided in the root portion of the blade plate. When the root portion is broken and the blade plate moves, the blade plate is engaged with the support frame by the fall prevention member.

International Publication No. 2016/051665

  In such a conventional ceiling fan, stress concentrates on the base of the blade as a reaction to push down the air of the blade, and the blade does not separate even if the blade breaks due to metal fatigue due to repeated loading in long-term use. Although it is moored on the rotor side as described above, since the power is continuously supplied, there is a problem that it is continuously operated, and further safety is required.

  The present invention solves the above problems, and even if a load is repeatedly applied to the blade plate attached to the rotor of the motor and the blade is broken, the blade can be moored on the rotor side so that the blade plate is not separated. An object of the present invention is to provide a safety device for a ceiling fan that can automatically stop when a blade breaks.

  In order to achieve this object, the present invention provides a motor unit that can be mounted on a ceiling, a support frame that is rotated by the motor unit, a blade plate provided on the support frame, the blade plate, and the support. A fall prevention member engageable with the frame, and a safety switch for controlling energization to the motor unit, wherein the vane plate has a root portion fixed to the support frame, and the vane plate is The safety switch is energized when fixed to a support frame, and the safety switch stops energizing when the root portion is broken and the blade is moved, thereby achieving the intended purpose. To do.

  According to the present invention, a motor unit that can be attached to a ceiling, a support frame that is rotated by the motor unit, a blade plate provided on the support frame, and a drop that can be engaged with the blade plate and the support frame. A safety switch that controls energization of the motor unit, and the vane plate has a root portion that is fixed to the support frame. When the vane plate is fixed to the support frame, the safety switch Is in an energized state, and the safety switch stops energizing when the root portion is broken and the blade is moved.

  With the above configuration, energization can be stopped when the root portion is broken and the blade is moved.

Side view of the ceiling fan according to the first embodiment of the present invention. Partial enlarged view of the ceiling fan Partial enlarged view of the attachment part of the ceiling fan to the support part of the blades Perspective view when the blades are broken The perspective view of the loop part of the fall prevention member of the ceiling fan The figure of the state where the blade is held by the fall prevention member when the attachment part to the support part of the blade of the ceiling fan is damaged The elements on larger scale of the attachment part to the support part of the blade | wing of Embodiment 2 of this invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
A side view of the ceiling fan 1 according to the first embodiment of the present invention is shown in FIG. 1, and a partially enlarged view of the ceiling fan 1 is shown in FIG.

  As shown in FIGS. 1 and 2, the ceiling fan 1 includes a connecting portion 2, a motor portion 3, a motor cover 4, a support portion 5, and blades 6.

  The connecting portion 2 includes a joint portion 10 that engages with the hanging portion 9 and a pipe portion 11 that is fixed to the lower portion of the joint portion 10. The joint portion 10 is engaged with and suspended from the suspended portion 9 fixed to the ceiling 50, whereby the connecting portion 2 is supported by the ceiling 50 via the suspended portion 9. The ceiling fan may not be provided with the suspended portion 9, and the connecting portion 2 may be directly suspended from and supported by the ceiling 50.

  The motor unit 3 is supported by the connecting unit 2. The motor unit 3 includes a substantially disk-shaped stator 12 that is fixed to the lower portion of the pipe unit 11, and a substantially annular rotor 13 that rotates around the stator 12. When the motor unit 3 is energized, the rotor 13 rotates around the stator 12. A support portion 5 is fixed to the periphery of the rotor 13, and the support portion 5 rotates integrally with the rotor 13. A motor cover 4 is attached so as to cover the lower part of the motor unit 3.

  A plurality of blades 6 are detachably attached to the support portion 5. As shown in FIG. 2, the support portion 5 includes a receiving portion 14 that is an annular plate member, and a fixing portion 15 that supports the receiving portion 14 from below. The base portion 16 of the blade 6 is placed on the receiving portion 14 and, as will be described later, each blade 6 is detachably fixed to the receiving portion 14 and the fixing portion 15 using screws that are fastening members. The

  FIG. 3 is a partially enlarged view of a portion where the blade 6 included in the ceiling fan is attached to the support portion 5.

  As shown in FIG. 3, the blade 6 is a root portion 16 placed on the receiving portion 14 of the support portion 5, and a portion that is located radially outside the root portion 16 and substantially blows air. A certain wing portion 17 and a step portion 18 located between the root portion 16 and the wing portion 17 are provided. For example, the blade 6 is formed as a metal plate, and the root portion 16, the wing portion 17, and the stepped portion 18 are integrally formed. The step height in the width direction of the blade 6 is set in the step portion 18 so that the wing portion 17 is inclined and arranged at an angle suitable for blowing air with respect to the root portion 16 arranged in a substantially horizontal state. Specifically, the wing portion 17 is disposed to be inclined with respect to the rotation direction so that the edge on the rear side is lower than the edge on the front side in the rotation direction of the blade 6 in the width direction. Further, the blade 6 is provided with a plurality of convex portions (or concave portions) extending along the longitudinal direction in order to increase rigidity.

  Two fastening holes 19 are provided in the vicinity of both ends in the width direction of the root portion 16 of the blade 6. A plurality of holes 20 are provided in the receiving portion 14 of the support portion 5. A fastening member (not shown) such as a screw is inserted into the fastening hole 19 of the root portion 16 of the blade 6 and the hole 20 of the receiving portion 14 and fastened to the fixing portion 15, whereby the root portion 16 of the blade 6 is supported by the support portion. 5 is mounted in a state where it is placed on the surface.

  Next, a configuration for preventing the blade 6 from falling when the attachment portion (the root portion or the like) of the blade 6 included in the ceiling fan is damaged will be described.

  An opening groove 22 that extends along the length direction of the blade and is opened at the inner edge 21 of the root portion 16 is provided at the center portion in the width direction of the root portion 16 of the blade 6. The open groove 22 communicates with the first hole 22a, which is a substantially square hole opened to the inner edge 21 of the root portion 16, and the first hole 22a, and has a larger opening width than the first hole 22a. The second hole portion 22b is a quadrangular hole. The first hole portion 22a is positioned closer to the inner edge 21 of the root portion 16 than the second hole portion 22b.

  In the vicinity of the outer peripheral edge 23 (outer edge of the support portion 5) of the receiving portion of the support portion 5, a protruding portion 24 is provided that protrudes upward. The protrusion 24 is a plate-like protrusion having a T-shape when viewed from the blade length direction (radial direction). The protrusion 24 is fixed to the substantially flat plate-shaped first flat plate portion 24 a fixed to the receiving portion 14 and the upper portion of the first flat plate portion 24 a, and has a width larger than that of the first flat plate portion 24 a in the width direction of the blade 6. And a second plate portion 24b having a substantially rectangular plate shape.

  Here, the relationship between the open groove 22 provided in the root portion 16 of the blade 6 and the protrusion 24 provided in the receiving portion 14 will be described. The width of the second flat plate portion 24b of the protruding portion 24 is smaller than the opening width of the second hole portion 22b of the open groove 22 and larger than the opening width of the first hole portion 22a. The width of the first flat plate portion 24 a of the protrusion 24 is smaller than the opening width of the first hole portion 22 a of the open groove 22.

  Thus, the protrusion 24 is inserted into the second hole 22 b of the open groove 22 by placing the root portion 16 of the blade 6 on the receiving portion 14 of the support portion 5. Then, the first flat plate portion 24 a of the protrusion 24 is slid into the first hole portion 22 a of the open groove 22 by moving the blade 6 outward in the radial direction by a predetermined amount. As a result, as shown in FIG. 3, the second flat plate portion 24 b of the protrusion 24 and the first hole portion 22 a of the open groove 22 are engaged with each other at least in the width direction and the thickness direction of the blade 6. Become. In such a state, the two fastening holes 19 of the root portion 16 of the blade 6 are positioned in the two holes of the receiving portion 14 so that a fastening member (not shown) such as a screw can be inserted.

  In addition to the two fastening holes 19 and the open groove 22, a through hole 29 is provided in the root portion 16 of the blade 6. The through hole 29 is formed between the one fastening hole 19 and the open groove 22 and is formed as a long hole extending along the length direction of the blade 6, and from the center in the width direction of the blade 6. Arranged at the shifted position. The drop preventing member 7 passes through the through hole 29, and the loop portion of the drop preventing member passes through an opening portion on the outer side in the longitudinal direction of the blade 6 in the shape of a long hole.

  FIG. 4 is a perspective view of the loop portion of the fall prevention member 7. As shown in FIGS. 3 and 4, the fall prevention member 7 has a loop portion formed of a wire. For example, a rigid metal wire is used as the wire. The fall prevention member 7 has a first loop portion 30 and a second loop portion 31, and the first loop portion 30 is formed as a larger loop portion than the second loop portion 31. For example, the first loop portion 30 is formed in a single loop, and the second loop portion 31 is formed in a double loop. Each of the loop portions 30 and 31 is formed continuously by bending a single wire. Therefore, each of the first loop portion 30 and the second loop portion 31 has a discontinuous portion of the wire (for example, a portion in which the loop shape is formed substantially by bringing the wires close to each other). For example, by applying an external force to elastically deform the wire, the discontinuous portion can be expanded and the loop portion can be opened.

  The loop portion of the fall prevention member 7 having such a configuration is attached to the root portion 16 of the blade 6 as shown in FIG. Specifically, the wire constituting the first loop portion 30 passes through the through hole 29 of the root portion 16 of the blade 6. The second loop portion 31 is disposed around the second hole portion 22 b of the open groove 22. Further, one end of the wire rod of the fall prevention member 7 is inserted into and engaged with a notch 32 provided at the inner edge 21 of the root portion 16 of the blade 6. As described above, the fall prevention member 7 includes a non-continuous portion of the wire. The wire constituting the first and second loop portions 30 and 31 is elastically deformed in the thickness direction of the blade 6 to widen the discontinuous portion and penetrate the wire through the through hole 29, and the notch 32 has a wire rod. One end is inserted. Thereby, the wire which comprises the member 7 for fall prevention can be fixed to the blade | wing 6 so that cancellation | release is possible on both sides of the front and back of the blade | wing 6. FIG. That is, the fall prevention member 7 has a clip function that is fixed with the front and back surfaces of the blade 6 sandwiched while being elastically deformed.

  Further, as shown in FIG. 3, in the state where the root portion 16 of the blade 6 to which the fall prevention member 7 is fixed is placed on the receiving portion 14 and attached with a fastening member (not shown) such as a screw, the blade The projecting portion 24 of the receiving portion 14 is engaged with the 6 open grooves 22. The second loop portion 31 of the fall prevention member 7 is disposed around the protruding portion 24 in such a state.

  The operation of the ceiling fan 1 of the first embodiment having such a configuration will be described. In the ceiling fan 1, when the motor unit 3 is energized, the rotor 13 rotates. By this rotation, the blade 6 fixed to the support portion 5 together with the support portion 5 rotates around the center of the rotor 13. In the blade 6, the wing part 17 is inclined obliquely downward as it goes from the front side to the rear side in the rotational direction by the step part 18, so that the air flowing along the lower surface of the wing part 17 flows from the ceiling 50 side to the floor direction. It is blown to (downward). Each blade 6 is rotationally driven at a rotational speed of about 200 to 300 rotations / minute, for example.

  In the ceiling fan 1 according to the first embodiment, when the attachment portion of the blade 6 to the support portion 5 is damaged, such as when the root portion 16 of the blade 6 is damaged, the fall prevention member 7 prevents the blade 6 from falling. Functions and operations to be performed will be described.

  During the operation of the ceiling fan 1, when the attachment portion between the blade 6 and the support portion 5 is damaged, the root portion 16 of the blade 6 is directed outward from the receiving portion 14 of the support portion 5 by centrifugal force ( Trying to leave (radially outward). When the blade 6 starts moving outward in the radial direction, the open groove 22 engaged with the protrusion 24 slides relative to the protrusion 24 of the receiving portion 14. As a result, the second loop portion 31 of the fall prevention member 7 disposed around the projection 24 comes into contact with the projection 24 and further slides, whereby the second loop 31 is projected. 24 is engaged (becomes caught).

  Further, when the blade 6 is separated from the support portion 5 in the radially outward direction, the loop portions 30 and 31 of the fall prevention member 7 are deformed, and the protrusion 24 is formed from the open groove 22 of the root portion 16 of the blade 6. Detach (the engagement between the open groove 22 and the protrusion 24 is released). The blade 6 is further separated by the centrifugal force, and the inner edge 21 of the root portion 16 of the blade 6 is in a state of being located on the radially outer side than the outer edge of the support portion 5 (see FIG. 5). On the other hand, the fall prevention member 7 is greatly deformed by the centrifugal force of the blades 6 and the like, but penetrates the through hole 29 in the first loop portion 30, and the second loop portion 31 The projection 24 is engaged. Thereby, the blade | wing 6 will be in the state hold | maintained at the support part 5 via the loop parts 30 and 31 of the member 7 for fall prevention, and can prevent the blade | wing 6 from falling.

The feature of this embodiment is that when the root portion 16 is broken and the blade 6 moves during operation of the ceiling fan 1, the blade 6 is engaged with the support portion 5 by the fall prevention member 7, and the safety switch 8 is It is a point to stop energization to the motor unit. Specifically, a safety switch 8 is provided on the upper surface of the support portion 5, and an example of the safety switch 8 is a limit switch. The limit switch includes a switch portion 27 protruding upward from the upper surface of the limit switch. When the blade 6 is attached to the support portion 5, the switch portion 27 is pushed downward by the blade 6, and the safety switch 8 becomes conductive. On the other hand, when the root portion 16 of the blade 6 breaks, the loop portion engages with the protrusion 24 of the support portion 5, and the inner edge 21 of the root portion 16 of the blade 6 is more than the safety switch 8 of the support portion 5. The blade 6 is held by the support portion 5 through the loop portion of the fall prevention member 7 in a state of being located outside.
Thus, when the blade | wing 6 moves and the blade | wing 6 leaves | separates from the safety switch 8, the switch part 27 protrudes upwards and the safety switch 8 stops electricity supply. Thereby, if the blade | wing 6 is damaged, the motor part 3 will stop and rotation of the blade | wing 6 will also be stopped.
(Embodiment 2)
In FIG. 6, the same components as those in FIGS. 2, 3 and 4 are denoted by the same reference numerals, and detailed description thereof is omitted. A difference from the first embodiment is a drop prevention member 34. The fall prevention member 34 includes a protruding portion 24 of the support portion 5 and a hole portion 33 of the blade 6.

  FIG. 6 is a partially enlarged view of a portion where the blades of the ceiling fan according to Embodiment 2 of the present invention are attached to the support portion. As shown in FIG. 6, the support portion 5 includes a protruding portion 24. The blade 6 fixed to the support portion 5 is provided with a hole 33 at a position where the protruding portion 24 enters. When the root portion 16 is broken, the blade 6 moves to a position where the projection 24 is caught by the opening edge of the hole 33, and the inner edge 21 of the root portion 16 of the blade 6 is outside the safety switch 8 of the support portion 5. The blade 6 is held by the support portion 5 in the positioned state. When the blade 6 moves and the blade 6 moves away from the safety switch 8, the safety switch 8 stops energization.

  As a result, when the blade 6 breaks due to repeated loads, the unsafe state can be avoided automatically and immediately, and it is possible to avoid applying a load to the mechanism that prevents the blade 6 from dropping for a long time. Thus, a ceiling fan that can ensure safety can be obtained.

The present invention is useful as a ceiling fan for home use or office use.

DESCRIPTION OF SYMBOLS 1 Ceiling fan 2 Connection part 3 Motor part 4 Motor cover 5 Support part 6 Blade 7 Fall prevention member 8 Safety switch 9 Suspension part 10 Joint part 11 Pipe part 12 Stator 13 Rotor 14 Receiving part 15 Fixing part 16 Base part 17 Wing part 18 Step part 19 Fastening hole 20 Hole 21 Inner edge 22 Open groove 22a First hole part 22b Second hole part 23 Outer peripheral edge 24 Projection part 24a First flat plate part 24b Second flat plate part 27 Switch part 29 Through hole 30 First 1 loop portion 31 second loop portion 32 notch portion 33 hole portion 34 fall prevention member 50 ceiling

Claims (4)

A motor unit that can be mounted on the ceiling;
A support portion rotated by the motor portion;
Blades provided on the support,
A drop-preventing member that can be engaged with the blade and the support;
A safety switch for controlling energization to the motor unit,
The blade has a root portion fixed to the support portion,
When the blade is fixed to the support, the safety switch is energized,
The ceiling fan, wherein the safety switch stops energization when the root portion is broken and the blade is moved. Provide the safety switch on the support,
The safety switch contacts the blade;
When the root portion is broken,
When the blade moves and the blade leaves the safety switch,
The ceiling fan according to claim 1, wherein the safety switch stops energization. The fall prevention member is
A loop portion formed of a wire material so as to be engageable with the blade and the support portion;
The root portion of the blade is provided with a through hole through which the loop portion of the fall prevention member passes,
The support portion is provided with a protrusion that can be engaged with the loop portion of the fall prevention member,
In the state where the blade is attached to the support portion, the loop portion of the fall prevention member is arranged to be engageable with the protrusion of the support portion,
When the attachment part of the support part and the blade is damaged, the loop part engages with the protrusion part of the support part,
In a state where the inner edge of the root portion of the blade is located outside the safety switch of the support portion, the blade is held by the support portion via the loop portion of the fall prevention member. The ceiling fan according to claim 1 or 2, characterized in that The fall prevention member is
Providing a protrusion on the support,
A hole is provided at a position where the protrusion of the blade enters.
When the root portion is broken,
The protrusion is caught on the opening edge of the hole,
The ceiling fan according to claim 1 or 2, wherein the blades move to a position outside the safety switch.

Images