JP2012002233A - Ceiling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling fan used for circulation of air in a room, which can increase wind speed and wind quantity and of sending air in a wide range during operation, and can reduce load of a joining part of blade plates and of improving appearance during operation stop.SOLUTION: The ceiling fan provided with the plurality of blade plates 8 fixed on a rotor 5 and sending air with rotating the blade plates 8, can increase wind speed and wind quantity and of sending air in the wide range during operation since an outer diameter of the blade plate 8 is constructed to increase during operation of the ceiling fan, can reduce load of the joining part of the blade plates and of improving appearance during operation stop.

Description

  The present invention relates to a ceiling fan that is installed on a ceiling and is used for reducing the temperature of the sensible temperature caused by direct wind or circulating indoor air.

  Conventionally, this type of ceiling fan is known to be fixed to a rotating body that is rotated by an electric motor via a connecting member that supports one end of a long blade blade (see, for example, Patent Document 1).

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

  As shown in the figure, the overall structure of the ceiling fan 101 is composed of a canopy (upper cover) 102, an intermediate cover 103, an outer rotating body 104 and a lower cover 105 of an electric motor, and a blade 107 attached to a holder 106 of the outer rotating body 104. The simple mounting bracket 108 inside the canopy 102 is screwed to the ceiling 109 and the ceiling fan 101 is suspended.

  In the above configuration, the blades 107 are attached at a predetermined angle in the circumferential direction around the rotation axis. When the blades 107 are rotated by the electric motor, the blades 107 are stepped up by the pressure increasing action of the blades 107 in the forward direction. Air passing between the ceiling 109 and the blade 107 from the outer periphery is blown downward, and in reverse rotation, the air passes from the lower portion of the blade 107 between the ceiling 109 and the blade 107 to the outer periphery of the blade 107. Therefore, in the case of cooling in the vicinity of the ceiling fan 101 mainly in the summer, it is used in the forward rotation, and in the case of encouraging the circulation of the air in the whole room so as not to feel the cold wind by the direct wind mainly in the winter. Used in reverse rotation.

Japanese Patent Laid-Open No. 11-210678

  In such a conventional ceiling fan, the outer diameter and the chord length of the blades 107 are constant, and in order to increase the wind speed and the air volume in order to improve the cool wind feeling and expand the reachable range of the air, the rotational speed must be increased. Since there is no method, the amount of increase is limited by the capacity of the motor and the strength of the blades, and there is a problem that noise increases due to an increase in the number of rotations. The increase in the number of rotations is suppressed, and the wind speed and air volume are increased. There is a demand for blowing air over a wide area.

  Further, since the outer diameter of the blade 107 is constant, there is a problem that the material of the holder 106 is fatigued because a load is always applied to the holder 106 that is a joint portion due to the weight of the blade 107 when the operation is stopped. There is a problem that the outer appearance is poor due to the drooping of the outer peripheral part due to the pressure and the feeling of pressure due to the large outer diameter and chord length of the blade 107, and it is required to reduce the load on the joint and improve the appearance when the operation is stopped. ing.

  The present invention solves such a conventional problem. A ceiling fan that can suppress an increase in the number of revolutions during operation to increase the wind speed and air volume, blow air over a wide range, and improve the appearance when the operation is stopped. It is intended to provide.

  In order to achieve the above object, the ceiling fan of the present invention has a mounting means for fixing one end of the rotating shaft to the ceiling surface side, an electric motor rotating around the rotating shaft, and a rotating body containing all or part of the electric motor. And a ceiling fan that is provided with a plurality of blades fixed to the electric motor or the rotating body, and the blades rotate with the electric motor to blow air. It is what.

  By this means, by increasing the chord length of the slats to increase the wind speed and air volume during the operation of the ceiling fan, the work of the slats is increased, and the increase in the rotational speed is suppressed and the wind speed and air volume are reduced. A ceiling fan that can be increased and blown over a wide range and whose appearance can be improved by shortening the chord length of the blades when operation is stopped is obtained.

  Another means is a ceiling fan in which one blade is composed of a main plate fixed to a rotating body and one or more chord length extension plates.

  By this means, the chord length of the slats can be increased when the ceiling fan is operated with a simple structure. Therefore, it is possible to suppress the increase in the rotational speed and increase the air speed and the air volume at a low cost, and to blow air over a wide range. Moreover, the ceiling fan which can improve an external appearance by shortening a blade board at the time of a driving | operation stop is obtained.

  Another means is a ceiling fan in which the chord length of the slats is extended by the centrifugal force generated by the rotation of the slats.

  By this means, when trying to increase the rotation speed in order to increase the wind speed and air volume of the ceiling fan, the chord length of the blade plate increases due to centrifugal force without applying external force other than rotation by the electric motor to the ceiling fan, By increasing the work load of the plate, it is possible to further increase the wind speed and air volume by suppressing the increase in the rotation speed, and to blow air over a wide range. A ceiling fan can be obtained.

  The other means is a ceiling fan in which a blade plate whose string length is extended by centrifugal force is restored by a restoring force of a spring.

  By this means, it is possible to increase the wind speed and air volume by increasing the chord length of the slats without applying external force other than rotation by the electric motor to the ceiling fan during operation, thereby increasing the wind speed and air volume and blowing air over a wide range. Also, the ceiling fan that can reliably reduce the chord length of the blades when the operation is stopped by the restoring force of the spring and can improve the appearance when the operation is stopped is obtained.

  Another means is a ceiling fan in which the chord length of the slats is expanded and contracted by an auxiliary electric motor included in the ceiling fan.

  By this means, by controlling the expansion and contraction by the auxiliary electric motor, it is possible to accurately increase the chord length of the slats in order to increase the wind speed and air volume during the operation of the ceiling fan, and the work of the slats Increases the speed and volume of air by suppressing the increase in the number of rotations, allowing air to be blown over a wide range, and shortening the chord length of the slats accurately and reliably when operation is stopped, improving the appearance A ceiling fan can be obtained.

  The other means includes a plurality of metal bands, one end of which is connected to a chord length extension plate of a plurality of blades and the other end is connected to a winding shaft of the auxiliary motor, and winding of the metal band by rotation of the auxiliary motor This is a ceiling fan in which the chord lengths of a plurality of slats are simultaneously expanded and contracted by feeding.

  By this means, the chord length of multiple blades can be expanded and contracted simultaneously by the auxiliary motor, so that the chord length of multiple blades can be made to be the same length at low cost. A ceiling fan that can be reliably maintained is obtained.

  According to the present invention, it is possible to provide a ceiling fan that can suppress an increase in the rotational speed during operation, increase the wind speed and air volume, blow air over a wide range, and improve the appearance when the operation is stopped.

The figure which shows the ceiling fan at the time of the stop of the reference form 1 of this invention ((a) perspective view, (b) partial perspective view) The figure which shows the ceiling fan at the time of the stop of the reference form 1 ((a) partial side view, (b) side view) The figure which shows the ceiling fan at the time of the driving | operation of the reference form 1 ((a) perspective view, (b) partial perspective view) The figure which shows the ceiling fan at the time of a stop of the reference form 2 ((a) perspective view, (b) partial side view) The figure which shows the ceiling fan at the time of the driving | operation of the same reference form 2 ((a) perspective view, (b) side view) The figure which shows the ceiling fan of the same reference form 3 ((a) perspective view, (b) partial side view) Side view showing ceiling fan of form 4 of reference The figure which shows the ceiling fan of the same reference form 5 ((a) Side view at the time of a stop, (b) Side view at the time of driving | operation) Partial sectional side view which shows the ceiling fan of the form 6 of the reference The figure which shows the ceiling fan of Embodiment 1 ((a) Partial perspective view at the time of a stop, (b) Partial perspective view at the time of driving | operation) The figure which shows the ceiling fan of Embodiment 1 ((a) Partial side view when stopped, (b) Partial side view when operating) Side view showing the ceiling fan of the first embodiment The fragmentary sectional side view which shows the ceiling fan of Embodiment 2 The figure which shows the ceiling fan of the form 7 of the reference ((a) perspective view, (b) side view) The perspective view which shows the ceiling fan of the form 8 of the reference The figure which shows the ceiling fan of the same reference form 8 ((a) Partial side view at the time of a stop, (b) Partial side view at the time of driving | operation) The figure which shows the ceiling fan of the form 9 of the same reference ((a) Reverse symmetrical laminated composite development view, (b) Perspective view) The figure which shows the ceiling fan of the same reference form 9 ((a) Partial side view at the time of a stop, (b) Partial side view at the time of driving | operation) Partial sectional side view showing the ceiling fan of the reference form 10 Side view showing a conventional ceiling fan

  According to the first aspect of the present invention, there is provided an attachment means for fixing one end of the rotating shaft to the ceiling surface side, an electric motor rotating around the rotating shaft, a rotating body containing all or part of the electric motor, and an electric motor Or a ceiling fan that has a plurality of blades fixed to the rotating body, and the blades rotate with the electric motor and blows air. The ceiling fan is designed to extend the chord length of the blades when the ceiling fan is in operation. By increasing the chord length of the slats to increase the wind speed and air volume during the ceiling fan operation, the work of the slats increases, and the increase in the speed and air volume is suppressed by suppressing the increase in the rotational speed. It can be blown over a wide range, and has an effect that the appearance can be improved by shortening the chord length of the blade when the operation is stopped.

  In addition, one blade is a ceiling fan composed of a main plate fixed to the rotating body and one or more string length extension plates. Since the chord length can be increased, the increase in rotation speed can be suppressed at a low cost, the air speed and air volume can be increased, and air can be blown over a wide range. It has the effect that it can be made.

  In addition, it is a ceiling fan in which the chord length of the slats is extended by the centrifugal force due to the rotation of the slats, and when trying to increase the rotation speed to increase the wind speed and air volume of the ceiling fan, Without applying external force other than rotation by the electric motor to the ceiling fan, the chord length of the slats is increased by centrifugal force, and by increasing the work of the slats, the increase in the number of rotations is further suppressed to increase the wind speed and air volume, The air can be blown over a wide range, and when the operation is stopped, the chord length of the slats is shortened and the appearance can be improved.

  In addition, the wing plate whose string length is extended by centrifugal force is used as a ceiling fan that is restored by the restoring force of the spring. During operation, the wing plate is applied without applying external force other than rotation by the electric motor to the ceiling fan. The chord length of the slats can be shortened reliably when the operation is stopped by the restoring force of the spring. And has the effect of improving the appearance when the operation is stopped.

  In addition, the chord length of the slats is a ceiling fan that is expanded and contracted by an auxiliary motor included in the ceiling fan, and by controlling expansion and contraction by the auxiliary motor, the wind speed during operation of the ceiling fan, In order to increase the air volume, it is possible to accurately increase the chord length of the slats, increase the work amount of the slats, suppress the increase in the number of rotations, increase the wind speed, the air volume, and blow air over a wide range In addition, the chord length of the blade can be shortened accurately and reliably when the operation is stopped, and the appearance can be improved.

  In addition, a plurality of metal bands having one end connected to the chord length extension plate of a plurality of blades and the other end connected to the winding shaft of the auxiliary motor are provided by winding and unwinding the metal band by the rotation of the auxiliary motor. This is a ceiling fan that expands and contracts the chord length of the slats at the same time, and the chord length of a plurality of slats can be expanded and contracted at the same time by the auxiliary electric motor. Since the chord length can be surely made the same length, there is an effect that the rotation balance of the ceiling fan can be reliably maintained.

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

(Reference form 1)
As shown in FIGS. 1 and 2, the ceiling fan 1 includes an attachment means 3 for fixing one end of the rotating shaft 2 to the ceiling surface side, an electric motor 4 rotating around the rotating shaft 2, and the electric motor 4. A rotating body 5 having an outer diameter of 250 mm that rotates together with the electric motor 4, a main plate 6 fixed to the rotating body 5, a diameter extension plate 7 that can slide in parallel with the main plate 6 in the radial direction and can extend the outer diameter of the ceiling fan 1. Are fixed at an equal pitch in parallel with a plane perpendicular to the rotary shaft 2 with an attachment angle θ. In this example, the attachment angle θ is 30 degrees. Further, the lower end surface 9 of the main plate 6 is provided with a slit hole 10, a projection 11 provided on the diameter extension plate 7 is positioned in the slit hole 10, and the inner peripheral side end 12 of the projection 11 and the slit hole 10 is a spring. 13, the outer diameter of the main plate 6 is 600 mm, the length of the diameter extension plate 7 is 250 mm, and the outer diameter of the blade plate 8 is movable between 600 mm and 900 mm by sliding the diameter extension plate 7. It has a structure. The attachment means 3 is a hook member that can be fixed to a hook ceiling provided in advance on the ceiling 14.

  With this configuration, when the blade 8 is rotated by the electric motor 4 in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the pressure between the ceiling 14 and the blade 8 is increased by the pressure increase of the blade 8. The room air flows into the slat 8 from the slat 8 and a downward air blow 17 is generated from the slat 8, but in order to increase the wind speed and air volume, the output of the motor 4 is increased and the rotational speed is increased. Since the centrifugal force acts in the radial direction, the radial extension plate 7 slidable in the radial direction moves outward in the radial direction against the tensile force of the spring 13 due to the centrifugal force, and the outer diameter of the blade plate 8 increases. As the outer diameter of the blade 8 increases, the area of the lower surface 15 of the blade 8 increases, the load on the blade 8 increases due to air resistance, and the rotational speed tends to decrease. Therefore, the rotational speed, centrifugal force, and spring 13 The rotation speed at which the restoring force due to the tensile force balances and the outer diameter of the blade 8 are constant. The state is shown in FIG. Therefore, since the increase in the number of rotations can be suppressed, the increase in noise can be suppressed, and the outer diameter of the blade plate 8 is increased, so that the work amount and the peripheral speed of the blade plate 8 are increased, and the wind speed and the air volume are increased. Can be blown.

  When the operation is stopped, the diameter extension plate 7 is moved radially inward by the restoring force due to the tensile force of the spring 13, and the outer diameter of the blade plate 8 is shortened to return to the state of FIG. The load on the joint portion of the rotating body 5 can be reduced, the droop due to the weight of the blade 8 and the feeling of pressure due to the large outer diameter of the blade 8 can be reduced, and the appearance can be improved.

(Reference form 2)
As shown in FIG. 4, the diameter extension plate 7 constituting the blade plate 8 has a cylindrical shape with an inner peripheral side opened, and a chord length Lb in an arbitrary circumferential section of the diameter extension plate 7 is a string of the main plate 6. Larger than the length La, the main plate 6 is enclosed in the cylindrical inside of the diameter extension plate 7, and is configured to be slidable in the radial direction. Further, the lower end surface 9 of the diameter extension plate 7 is provided with a slit hole 10, a projection 11 provided on the main plate 6 is located in the slit hole 10, and the projection 11 has an outer peripheral end 18 of the slit hole 10 at the spring 13. It is connected with.

  With this configuration, when the blade 8 is rotated by the electric motor 4 in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the pressure between the ceiling 14 and the blade 8 is increased by the pressure increase of the blade 8. The room air flows into the slat 8 from the slat 8 and a downward air blow 17 is generated from the slat 8, but in order to increase the wind speed and air volume, the output of the motor 4 is increased and the rotational speed is increased. Since the centrifugal force acts in the radial direction, the radial extension plate 7 slidable in the radial direction moves outward in the radial direction against the tensile force of the spring 13 due to the centrifugal force, and the outer diameter of the blade plate 8 increases. (The state is shown in FIG. 5.) The work diameter and the outer peripheral speed of the blade plate 8 are increased by increasing the outer diameter of the blade plate 8, and the increase in the rotational speed is suppressed and the wind speed and the air volume are increased. Since the chord length Lb of the diameter extension plate 7 is longer than the chord length La of the main plate 6, the peripheral speed is the fastest and the work is performed further on the outer peripheral portion where the work volume is large. Can be blown.

  When the operation is stopped, the diameter extension plate 7 moves radially inward due to the restoring force due to the tension force of the spring 13 and the outer diameter of the blade plate 8 is shortened. The load can be reduced, and the feeling of pressure due to the large outer diameter of the blade 8 and the droop due to the dead weight of the blade 8 can be reduced, and the appearance can be improved.

(Reference form 3)
As shown in FIG. 6, the radial extension plate 7 includes an overlapping portion 19 that overlaps the main plate 6 and a non-overlapping portion 20 that does not overlap, and the chord length Lo of the non-overlapping portion 20 is longer than the chord length Li of the overlapping portion 19. It has a configuration. In this example, the chord length Lo of the non-overlapping portion 20 is 20% longer than the chord length Li of the overlapping portion 19.

  With this configuration, since the chord length Lo of the outer peripheral portion with the fastest peripheral speed and the large work amount becomes long, it is possible to increase the wind speed and air volume by suppressing the increase in the rotational speed, and to blow air over a wide range. Since the chord length Li of the overlapping portion 19 on the inner peripheral side with a small amount is small, the weight can be reduced and the cost can be reduced.

(Reference form 4)
As shown in FIG. 7, the ceiling fan 1 includes an attachment means 3 for fixing one end of the rotating shaft 2 to the ceiling surface side, an electric motor 4 that rotates around the rotating shaft 2, and an electric motor 4 that includes the electric motor 4. The blades 8 are fixed at three equal pitches in parallel to a plane perpendicular to the rotary shaft 2 through rod-like members 21 that are radially fixed to the rotary body 5. Has been. Further, the blade 8 is provided with a hole that can contain the rod-shaped material 21, the tip of the rod-shaped material 21 and the hole are connected by a spring 13, and the outer diameter of the blade 8 is reduced from 600 mm by sliding the blade 8. The structure is movable between 900 mm. The attachment means 3 is a hook member that can be fixed to a hook ceiling provided in advance on the ceiling 14. The rod-like material 21 may be rod-like and strong, for example, an iron pipe.

  With this configuration, when the vane plate 8 is rotated in the rotation direction 16 by the electric motor 4 in order to blow downward, the room air flows into the vane plate 8 from between the ceiling 14 and the vane plate 8 due to the pressure increasing action of the vane plate 8. The air blower 17 is generated downward from the blade plate 8, but the centrifugal force acts on the blade plate 8 in the radial direction as the output of the motor 4 is increased and the rotation speed is increased in order to increase the wind speed and air volume. The blade 8 slidable in the direction moves radially outward against the tensile force of the spring 13 by centrifugal force, and the outer diameter of the blade 8 increases. As the outer diameter of the blade 8 increases, the area of the lower surface 15 of the blade 8 increases, the load on the blade 8 increases due to air resistance, and the rotational speed tends to decrease. Therefore, the rotational speed, centrifugal force, and spring 13 The rotation speed at which the restoring force due to the tensile force balances and the outer diameter of the blade 8 are constant. Therefore, the simple structure of the bar-like material 21 can suppress the increase in the number of revolutions, so that the increase in noise can be suppressed, and the outer diameter of the blade plate 8 increases, so that the work amount and the outer peripheral speed of the blade plate 8 increase. The wind speed and the air volume can be increased and the air can be blown over a wide range.

  When the operation is stopped, the diameter extension plate 7 is moved radially inward by the restoring force due to the tension force of the spring 13, the outer diameter of the blade plate 8 is shortened, and the load on the joint between the blade plate 8 and the rotating body 5 is reduced. Can be reduced, and the feeling of pressure due to the large outer diameter of the blade 8 can be reduced, and the appearance can be improved.

(Reference form 5)
As shown in FIG. 8 (a), a blade plate 8 comprising a main plate 6 fixed to the rotating body 5 and a diameter extending plate 7 slidable in parallel with the main plate 6 is in a plane perpendicular to the rotary shaft 2. Three pieces are fixed at an equal pitch with an elevation angle β of 10 degrees upward in the radial direction. The lower end surface 9 of the main plate 6 is provided with a slit hole 10, and a protrusion 11 provided on the diameter extension plate 7 is positioned in the slit hole 10 so that the diameter extension plate 7 does not slide and come off.

  Since the vane plate 8 has an elevation angle β of 10 degrees radially upward with respect to the plane perpendicular to the rotation axis 2, the radial extension plate 7 exerts a force in a direction in which the vane diameter is reduced by its own weight. The outer diameter of the plate 8 can be reduced, the load on the joint between the blade plate 8 and the rotating body 5 can be reduced, and the appearance can be improved.

  Further, as shown in FIG. 8B, when the vane plate 8 is rotated in the rotation direction 16 in which pressure is applied to the lower surface 15 of the vane plate 8 by the electric motor 4 to blow downward, Room air flows into the slats 8 from between the ceiling 14 and the slats 8 and blows 17 downward from the slats 8, but the output of the motor 4 is increased in order to increase the wind speed and the air volume. As the blade plate 8 is raised, centrifugal force acts on the blade plate 8 in the radial direction, but the radially extending plate 7 slidable in the radial direction moves radially outward by the centrifugal force against the restoring force due to its own weight, The outer diameter of the slat 8 is increased. As the outer diameter of the slat 8 increases, the area of the lower surface 15 of the slat 8 increases, the load on the slat 8 increases due to air resistance, and the rotational speed tends to decrease. Therefore, the rotational speed, centrifugal force, and diameter extension plate 7 is steady at the rotational speed at which the restoring force due to its own weight balances and the outer diameter of the blade 8. Therefore, since the increase in the number of rotations can be suppressed, the increase in noise can be suppressed, and the outer diameter of the blade plate 8 is increased, so that the work amount and the peripheral speed of the blade plate 8 are increased, and the wind speed and the air volume are increased. Can be blown.

(Reference form 6)
As shown in FIG. 9, the ceiling fan 1 includes three blades 8 including a main plate 6 and a diameter extension plate 7, and an auxiliary motor fixed inside the rotating body 5 so as not to rotate due to the rotation of the motor 4. 22 is included, and three metal bands 24 having one end connected to the diameter extension plate 7 are fixed to the winding shaft 23 of the auxiliary motor 22, and the metal band 24 is wound by the rotation of the auxiliary motor 22. The diameter extension plate 7 is slid in parallel with the main plate 6 by feeding and the three blade plates 8 can be expanded and contracted simultaneously.

  With this configuration, when the blade 8 is rotated by the electric motor 4 in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the pressure between the ceiling 14 and the blade 8 is increased by the pressure increase of the blade 8. However, in order to increase the wind speed and the air volume, the auxiliary motor 22 can reliably increase the outer diameter of the vane plate 8. Therefore, it is possible to suppress the increase in the number of rotations by suppressing the increase in the number of rotations, and the work diameter and the outer peripheral speed of the blade plate 8 are increased by increasing the outer diameter of the blade plate 8, thereby increasing the wind speed and the air volume. A wide range of air can be blown.

  Further, when the operation is stopped, the outer diameter of the blade 8 can be shortened accurately and surely by the auxiliary motor 22, so that the load on the joint between the blade 8 and the rotating body 5 can be reduced and the appearance is improved. be able to.

  Further, since the outer diameters of the plurality of blades 8 can be expanded and contracted simultaneously by the auxiliary electric motor 22, the outer diameter of the plurality of blades 8 can be surely made the same length at a low cost. The rotation balance can be reliably maintained, and vibration and noise can be suppressed.

  In addition, the extension of the blade plate 8 may use a centrifugal force due to rotation, and the auxiliary motor 22 may reduce the blade plate 8 when stopped.

  In addition, when the blower 17 is required only in a narrow range, the blade 8 can be rotated in a state where the blade 8 is reduced by the auxiliary electric motor 22, and the ceiling fan 1 can be used with low power consumption.

(Embodiment 1)
As shown in FIGS. 10 to 12, the ceiling fan 1 includes an attachment means 3 for fixing one end of the rotating shaft 2 to the ceiling surface side, an electric motor 4 rotating around the rotating shaft 2, and the electric motor 4. A rotating body 5 having an outer diameter of 250 mm that rotates together with the electric motor 4; a main plate 6 that is fixed to the rotating body 5 and that has an open lower end surface 9; and a string extension plate 25 that is contained in the main plate 6 and that can slide in parallel with the main plate 6. Three blade plates 8 are fixed at an equal pitch parallel to a plane perpendicular to the rotary shaft 2 with an attachment angle θ. In this example, the outer diameter of the blade 8 of the ceiling fan 1 is 900 mm, the string extension plate 25 has a radial length of 250 mm, a circumferential width of 50 mm, and an attachment angle θ of 30 degrees. The main plate 6 and the string extension plate 25 are connected to each other by two connecting plates 27 each having a rotating shaft 26 at both ends, and the connecting plate 27 is connected to the main plate 6 by the spring 13 and the ceiling fan. When the operation 1 is stopped, the spring 13 exerts stress so that the connecting plate 27 extends along the radial direction, and the string extension plate 25 is included in the main plate 6 and fixed.

  With this configuration, when the blade 8 is rotated by the electric motor 4 in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the pressure between the ceiling 14 and the blade 8 is increased by the pressure increase of the blade 8. The room air flows into the slat 8 from the slat 8 and a downward air blow 17 is generated from the slat 8, but in order to increase the wind speed and air volume, the output of the motor 4 is increased and the number of rotations is increased. Centrifugal force acts in the radial direction, the coupling plate 27 rotates so as to be perpendicular to the radial direction against the tensile force of the spring 13, the string extension plate 25 projects from the lower end face 9 of the main plate 6, and the blade plate The chord length L of 8 becomes longer. As the chord length L of the slat 8 increases, the area of the lower surface 15 of the slat 8 increases, and the attachment angle θ of the slat 8 increases to 35 degrees, the load on the slat 8 increases due to air resistance, and the rotational speed Therefore, the rotation speed, centrifugal force, and restoring force due to the tension force of the spring 13 are balanced, and the rotation speed and the chord length of the blade 8 are steady. Therefore, since the increase in the number of rotations can be suppressed, the increase in noise can be suppressed, and the chord length L of the slat 8 is increased, so that the work amount of the slat 8 is increased, the wind speed and the air volume are increased, and the air is blown over a wide range. be able to.

  When the operation is stopped, the connecting plate 27 is rotated along the radial direction by the restoring force due to the tensile force of the spring 13, the string extension plate 25 is moved into the main plate 6, and the chord length L of the blade plate 8 is Since it becomes short, the feeling of pressure by the chord length of the blade 8 is reduced, and the appearance can be improved.

(Embodiment 2)
As shown in FIG. 13, the ceiling fan 1 includes three blades 8 including a main plate 6 and a string extension plate 25, and an auxiliary motor fixed inside the rotating body 5 so as not to rotate due to the rotation of the motor 4. 22 is included, and three metal bands 24 having one end connected to the string extension plate 25 are fixed to the winding shaft 23 of the auxiliary motor 22. The main plate 6 and the string extension plate 25 are connected to each other by two connecting plates 27 so as to be rotatable, and the connecting plate 27 is rotated by winding and unwinding the metal strip 24 by the rotation of the auxiliary electric motor 22 to extend the string. The plate 25 is protruded from the lower end surface 9 of the main plate 6 or retracted so that the chord length L of the three blades 8 can be expanded and contracted simultaneously.

  With this configuration, when the blade 8 is rotated by the electric motor 4 in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the pressure between the ceiling 14 and the blade 8 is increased by the pressure increase of the blade 8. However, in order to increase the wind speed and the air volume, the auxiliary motor 22 can reliably increase the chord length of the vane plate 8. Therefore, the increase in the number of rotations can be suppressed and the increase in noise can be suppressed. Also, the chord length of the slat 8 is increased, the work amount of the slat 8 is increased, the wind speed and the air volume are increased, and the air is blown over a wide range. Can be made.

  Moreover, since the chord length of the blade 8 can be shortened accurately and reliably by the auxiliary electric motor 22 when the operation is stopped, the appearance can be improved.

  Further, since the chord lengths of the plurality of blades 8 can be simultaneously expanded and contracted by the auxiliary electric motor 22, the chord lengths of the plurality of blades 8 can be surely made the same length. The rotation balance can be reliably maintained, and vibration and noise can be suppressed.

  In addition, the extension of the chord length of the blade plate 8 may use a centrifugal force by rotation, and the chord length of the blade plate 8 may be reduced by the auxiliary motor 22 when stopped.

(Reference form 7)
As shown in FIG. 14, the ceiling fan 1 includes an attachment means 3 for fixing one end of the rotating shaft 2 to the ceiling surface side, an electric motor 4 that rotates around the rotating shaft 2, and an electric motor 4 that includes the electric motor 4. In addition, three iron blades 8 fixed to the rotating body 5 are fixed at a constant pitch parallel to a plane perpendicular to the rotating shaft 2. The outer diameter of the blade 8 is 900 mm, and the attachment means 3 is a hooking member that can be fixed to a hooking ceiling provided in advance on the ceiling 14. Also, a support column 28 having a length of 70 mm is fixed to the blade plate 8 at an angle of 25 degrees from the lower surface 15 of each blade plate 8 outward in the radial direction, and a spherical weight 29 is fixed to the tip of the column 28. Yes.

  With this configuration, when the blade 8 is rotated by the electric motor 4 in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the pressure between the ceiling 14 and the blade 8 is increased by the pressure increase of the blade 8. The room air flows into the slat 8 from the slat 8 and the air blow 17 downward from the slat 8 is generated. However, as the output of the motor 4 is increased and the rotational speed is increased to increase the wind speed and air volume, On the other hand, a centrifugal force acts in the radial direction on the weight 29 fixed to the tip of the column 28 that has an angle outwardly in the radial direction, and a force that causes the column 28 to be parallel to a plane perpendicular to the rotary shaft 2 is applied accordingly. Thus, the blade 8 is bent upward by the elasticity of the iron material, and the air blowing 17 spreads outward, so that air can be blown over a wide range.

(Reference form 8)
As shown in FIGS. 15 and 16, the ceiling fan 1 includes an attachment means 3 for fixing one end of the rotating shaft 2 to the ceiling surface side, and a rotating body 5 having an outer diameter of 250 mm that rotates around the rotating shaft 2. In addition, three iron blades 8 fixed to the rotating body 5 are fixed at an equal pitch parallel to a plane perpendicular to the rotating shaft 2 with an attachment angle θ. In this example, the attachment angle θ is 30 degrees. The outer diameter of the slat 8 is 900 mm. At the center of the outer peripheral side end 18 of the slat 8, 50 mm long struts 28 are fixed on both sides in the direction perpendicular to the slat 8. A spherical weight 29 is fixed to each end.

  With this configuration, when the blade 8 rotates in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the blade 8 is blown downward from the blade 8 due to the pressure increasing action of the blade 8. As the output of the motor 4 is increased and the rotational speed is increased to increase the air volume, a centrifugal force acts in the radial direction on each of the weights 29 at the end of the support column 28 fixed to the outer peripheral side end 18 of the vane plate 8, Along with this, a force that causes the support column 28 to be parallel to the plane perpendicular to the rotating shaft 2 is actuated so that the vane plate 8 is twisted so that the mounting angle in the circumferential direction is increased by the elasticity of the iron material. θ can be increased, the increase in the rotational speed can be suppressed, the wind speed and the air volume can be increased, and the air can be blown over a wide range.

(Reference form 9)
As shown in FIGS. 17 and 18, the vane plate 8 has a characteristic that causes torsional deformation such that the mounting angle θ of the outer peripheral portion becomes larger with respect to the tensile load, so that the orientation angle α of the reinforcing fiber becomes inversely symmetric. It is comprised by the reverse symmetrical laminated composite material laminated | stacked on. In this example, the inversely symmetric laminated composite material is obtained by laminating 16 layers of a composite material layer 30 having a main material thickness of 0.15 mm and an epoxy resin having carbon fibers as reinforcing fibers. When the orientation of is positive, the composite material layers having the reinforcing fiber orientation angles α of −60 degrees, 30 degrees, −30 degrees, and 60 degrees, respectively, are laminated in one layer, seven layers, seven layers, and one layer, respectively. ing. Further, the attachment angle θ of the blade 8 is 30 degrees.

  With this configuration, when the blade 8 rotates in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the blade 8 is blown downward from the blade 8 due to the pressure increasing action of the blade 8. As the rotational speed is increased in order to increase the air flow, a centrifugal tensile force applies a tensile load to the blade plate 8 in the radial direction, and the circumferential mounting angle is increased by the characteristics of the antisymmetric laminated composite material. The attachment angle θ of the outer peripheral portion can be increased, the increase in the rotational speed can be suppressed, the wind speed and the air volume can be increased, and the air can be blown over a wide range.

(Reference form 10)
As shown in FIG. 19, the ceiling fan 1 includes an attachment means 3 for fixing one end of the rotating shaft 2 to the ceiling surface side, an electric motor 4 that rotates around the rotating shaft 2, and an electric motor 4 that includes the electric motor 4. In addition, a rotating body 5 having an outer diameter of 250 mm that rotates with the rotating body 5 is fixed, and three blades 8 fixed to the rotating body 5 are fixed at an equal pitch parallel to a plane perpendicular to the rotating shaft 2. The outer diameter of the blade 8 is 900 mm, and the attachment means 3 is a hooking member that can be fixed to a hooking ceiling provided in advance on the ceiling 14. The rotary shaft 2 is made of two pipes 31 that can be included by sliding one of them, and an auxiliary motor 22 fixed so as not to rotate by the rotation of the electric motor 4 is included inside the rotating body 5. A metal strip 24, one end of which is connected to the attachment means 3, is fixed to the winding shaft 23 of 22, and the pipe 31 of the rotary shaft 2 is slid by winding and unwinding the metal strip 24 by the rotation of the auxiliary motor 22. It can be expanded and contracted.

  With this configuration, when the blade 8 is rotated by the electric motor 4 in the rotation direction 16 in which pressure is applied to the lower surface 15 of the blade 8 in order to blow downward, the pressure between the ceiling 14 and the blade 8 is increased by the pressure increase of the blade 8. The indoor air flows into the blade 8 from the blade 8 and the downward blowing 17 is generated from the blade 8, but the length of the rotating shaft 2 of the ceiling fan 1 is increased by the auxiliary motor 22 during the operation of the ceiling fan 1. Since the loss at the time of inflow can be reduced by increasing the distance between the ceiling 14 and the slat 8, the increase in the amount of air flowing into the slat 8 is suppressed, and the increase in the rotational speed is suppressed to reduce the wind speed and air volume. It can be increased and blown over a wide range.

  Moreover, since the ceiling fan 1 can be made to adjoin to the ceiling 14 by shortening the length of the rotating shaft 2 of the ceiling fan 1 when the operation is stopped, the feeling of pressure can be reduced and the appearance can be improved.

  The present invention provides a ceiling fan that can increase the wind speed and air volume during operation, can blow air over a wide range, can reduce the load on the joint of the blades when operation is stopped, and can improve the appearance.

DESCRIPTION OF SYMBOLS 1 Ceiling fan 2 Rotating shaft 3 Attaching means 4 Electric motor 5 Rotating body 6 Main plate 7 Diameter extension plate 8 Blade plate 9 Lower end surface 10 Slit hole 11 Protrusion 12 Inner peripheral end 13 Spring 14 Ceiling 15 Lower surface 16 Rotating direction 17 Air blow 18 Outer periphery Side end 19 Overlapping portion 20 Non-overlapping portion 21 Bar-shaped material 22 Auxiliary motor 23 Winding shaft 24 Metal strip 25 String extension plate 26 Rotating shaft 27 Connecting plate 28 Strut 29 Weight 30 Composite material layer 31 Pipe L String length La String length Lb String length Li String length Lo String length θ Mounting angle α Orientation angle β Elevation angle

Claims (6)

Fixing means for fixing one end of the rotating shaft to the ceiling surface side, an electric motor rotating around the rotating shaft, a rotating body containing all or part of the electric motor, and the electric motor or the rotating body A ceiling fan comprising a plurality of blades, wherein the blades rotate with the electric motor to blow air, and the chord length of the blades is extended during operation of the ceiling fan. The ceiling fan according to claim 1, wherein one blade is composed of a main plate fixed to the rotating body and one or more chord length extension plates. The ceiling fan according to claim 1 or 2, wherein the chord length of the slats is extended by centrifugal force due to rotation of the slats. The ceiling fan according to claim 3, wherein the blade plate whose string length is extended by centrifugal force is restored by a restoring force of a spring. The ceiling fan according to claim 1 or 2, wherein the chord length of the slats is expanded and contracted by an auxiliary electric motor included in the ceiling fan. A plurality of metal bands having one end connected to a chord length extension plate of a plurality of blades and the other end connected to a winding shaft of the auxiliary motor, and by winding and unwinding the metal band by rotation of the auxiliary motor The ceiling fan according to claim 5, wherein the chord lengths of the blades are simultaneously expanded and contracted.

Images