WO2011063548A1

WO2011063548A1 - Ceiling fan

Info

Publication number: WO2011063548A1
Application number: PCT/CN2009/001318
Authority: WO
Inventors: Jianqiang Zhao; Decong Yang; Zhijun Li; Kiminobu Yamamoto; Tetsuji Kawazu
Original assignee: Panasonic Corporation
Priority date: 2009-11-25
Filing date: 2009-11-25
Publication date: 2011-06-03

Abstract

A ceiling fan includes a coupling part (2), a main body part (3), and a motor part (4). The motor part includes a coil part (6), an upper motor cover part (7), a lower motor cover part (8), and a rotor part (10) located at an outer periphery of the coil part. The rotor part is provided with a plurality of blades (5) in a horizontal direction, the upper motor cover part and the rotor part are provided integrally and rotatably to the coupling part, and a first space portion (10a) is provided between the upper motor cover part and the rotor part. The upper motor cover part has a plurality of first and second holes (16a,16b), and the second holes are located at an outer periphery relative to the first holes, and a plurality of fins (11) are provided on a lower surface of the upper motor cover part.

Description

[DESCRIPTION]

[Title of Invention]

CEILING FAN

[Technical Field]

[0001]

The present invention relates to a ceiling fan suspended from a ceiling. [Background Art]

[0002]

Conventionally, a ceiling fan of this kind has the following configuration. A main body part suspended from a ceiling with a coupling part includes a blade and a motor. A rotor of the motor is sandwiched between an upper motor cover and a lower motor cover each being made of a metal plate and having a hole for cooling. Furthermore, the motor is surrounded by an upper main body cover and a lower main body cover each having a hole for cooling. Furthermore, a fin for cooling is provided on the upper portion of the upper main body cover. Citation relating to such a ceiling fan includes Patent Literature 1.

[0003]

In the above-mentioned conventional ceiling fan, when specifications of a stator, a rotor, a coil, and the like, are determined, in order to secure the safety of products, it is necessary to keep the temperature rise of a motor in a predetermined range. Herein, the stator, the rotor, and the coil constitute the motor as an outer rotor of the ceiling fan. In general, a core thickness of a stator or a rotor is increased, the temperature rise of a motor can be suppressed. In this case, however, necessary core materials are increased, causing the increase in cost and weight and the damage in the design property. Therefore, an air hole is provided in a yoke or a motor cover so as to dissipate heat of the motor by an airflow generated during operation of the ceiling fan. Alternatively, a fin is provided outside a motor so as to cool an outer contour of the motor whose temperature is increased due to heat conduction from the vicinity of a coil as a heat source, so that the temperature rise is suppressed. However, any of the methods have not been an efficient cooling method.

[Patent Literature]

[PTL 1]

Unexamined Japanese Patent Publication No. S61-108890

[Summary of Invention]

[0004]

A ceiling fan of the present invention includes a coupling part fixed to a ceiling, a main body part provided on a lower portion of the coupling part, and a motor part provided on the main body part. The motor part includes a coil part, an upper motor cover part covering the upper portion of the coil part, a lower motor cover part covering the lower portion of the coil part, and a rotor part located at the outer periphery of the coil part. The rotor part is provided with a plurality of blades in the horizontal direction. The upper motor cover part and the rotor part are provided integrally and rotatably to the coupling part. A first space portion is provided between the upper motor cover part and the rotor part. The upper motor cover part has a plurality of first and second holes. The second holes are located at the outer periphery relative to the first hole. A plurality of fins are provided on the lower surface of the upper motor cover part.

[0005]

In such a ceiling fan, during operation, the upper motor cover part, the lower motor cover part, and the rotor part are rotated integrally around the coupling part. Since a plurality of fins are provided on the lower surface of the upper motor cover part, the fins are also rotated together with the upper motor cover part. Therefore, the heated air in the vicinity of the coil part is exhausted into the room from the second holes through the first space portion between the upper motor cover part and the rotor part. Then, the air in the room is absorbed into the motor from a plurality of first holes of the upper motor cover part. In other words, the heated air in the vicinity of the coil inside the motor part is exhausted into the room from the second hole through the first space portion. Then, the air in the room, which has a temperature lower than that in the vicinity of the coil inside the motor part, is absorbed into the motor from a plurality of first holes of the upper motor cover part. As a result, the heated air in the vicinity of the coil is efficiently exhausted. Thus, the temperature rise in the coil part can be reduced.

[Brief Description of Drawings]

[0006]

[Fig. 1]

Fig. 1 is an outline view showing a ceiling fan in accordance with a first exemplary embodiment of the present invention.

[Fig. 2]

Fig. 2 is a sectional view showing a principal part of the ceiling fan.

[Fig. 3]

Fig. 3 is an outline view showing a ceiling fan in accordance with a second exemplary embodiment of the present invention.

[Fig. 4]

Fig. 4 is a sectional view showing a principal part of the ceiling fan.

[Fig. 5]

Fig. 5 is an outline plan view showing a principal part of the ceiling fan.

[Fig. 6]

Fig. 6 is a schematic view showing a principal part of the ceiling fan.

[Fig. 7]

Fig. 7 is an enlarged view showing a principal part of the ceiling fan.

[Fig. 8]

Fig. 8 is a graph showing an effect of temperature cooling of a motor of the ceiling fan.

[Fig. 9]

Fig. 9 is an outline perspective view showing a principal part of the ceiling fan.

[Description of Embodiments]

[0007]

Hereinafter, exemplary embodiments of the present invention are described with reference to drawings.

[Example 1]

[0008]

Fig. 1 is an outline view showing a ceiling fan in accordance with a first exemplary embodiment of the present invention, and Fig. 2 is a sectional view showing a principal part of the ceiling fan. As shown in Figs. 1 and 2, the ceiling fan in accordance with the exemplary embodiment of the present invention includes coupling part 2 fixed to ceiling 1 and main body part 3 suspended on the lower portion of coupling part 2.

[0009]

Main body part 3 includes motor part 4, blades 5 , and lower main body cover part 25. Herein, motor part 4 is suspended from ceiling 1 with shaft 26 as coupling part 2. Blades 5 are provided on motor part 4. Lower main body cover part 25 covers the lower surface of motor part 4.

[0010]

Motor part 4 includes stator 9, coil part 6, and rotor part 10. Herein, stator 9 is fixed to shaft 26 as coupling part 2, and has a substantially disk shape. Coil part 6 is fixed to the peripheral edge of stator 9 and has a substantially annular shape. Rotor part 10 is located at the outer periphery of coil part 6 and has a substantially annular shape.

[001 1]

Substantially bowl-shaped upper motor cover part 7 with the lower surface opened is provided above rotor part 10. Substantially bowl-shaped lower motor cover part 8 with the upper surface opened is provided below rotor part 10. Upper motor cover part 7, lower motor cover part 8, and rotor part 10 are integrally fixed by a rod member as connecting means 7a. That is to say, upper motor cover part 7 and rotor part 10 are integrally and rotatably provided on coupling part 2.

[0012]

Furthermore, bearing 27 is fixed to the center of upper motor cover part 7 and lower motor cover part 8. A plurality of blades 5, each having a substantially plate shape, are provided. Blades 5 are fixed to the upper surface of rotor part 10 in the horizontal direction. That is to say, motor part 4 includes coil part 6, upper motor cover part 7 covering the upper portion of coil part 6, and lower motor cover part 8 covering the lower portion of coil part 6, and rotor part 10 located at the outer periphery of coil part 6.

[0013]

Herein, since bearing 27 is inserted into and fixed to shaft 26, when motor part 4 is operated, upper motor cover part 7, lower motor cover part 8, rotor part 10, and a plurality of blades 5 are integrally rotated around shaft 26.

[0014]

The features of the ceiling fan in accordance with the first exemplary embodiment of the present invention include the following points. First space 10a is provided between upper motor cover part 7 and rotor part 10, and upper motor cover part 7 has a plurality of first holes 16a and a plurality of second holes 16b. Second holes 16b are located at the outer periphery relative to first holes 16a. A plurality of fins 11 are provided on the lower surface of upper motor cover part 7.

[0015]

That is to say, during operation of the ceiling fan, upper motor cover part 7, lower motor cover part 8, and rotor part 10 are integrally rotated around coupling part 2. Herein, since a plurality of fins 1 1 are provided on the lower surface of upper motor cover part 7, fins 11 are also rotated together with upper motor cover part 7. Thus, the heated air in the vicinity of coil part 6 is exhausted into the room from second holes 16b through first space portion 10a between upper motor cover part 7 and rotor part 10. Then, the air in the room is absorbed into motor part 4 from a plurality of first holes 16a of upper motor cover part 7.

[0016]

In other words, the heated air in the vicinity of coil part 6 inside motor part 4 is exhausted into the room from second holes 16b. The air in the room, which has a temperature lower than that in the vicinity of coil part 6 inside motor part 4, is absorbed into motor part 4 from a plurality of first holes 16a of upper motor cover part 7. As a result, heat of the heated air in the vicinity of coil part 6 is efficiently wasted. Thus, the temperature rise of coil part 6 can be reduced.

[0017]

Furthermore, fin 11 is formed of plate 1 1a extending in the outer peripheral direction from the center of motor part 4. A plurality of plates 11a as fins 11 extend radially on the lower surface of upper motor cover part 7.

[0018]

That is to say, during operation of the ceiling fan, since a plurality of plates 1 1a are rotated together with upper motor cover part 7, the heated air in the vicinity of coil part 6 is allowed to flow in the centrifugal direction. Then, the heated air is exhausted into the room from second hole 16b through first space portion 10a between upper motor cover part 7 and rotor part 10. Furthermore, the air in the room is absorbed into motor part 4 from a plurality of first holes 16a of upper motor cover part 7.

[0019]

Furthermore, fin 11 is disposed immediately above coil part 6. A plurality of plates 11a extend radially on the lower surface of upper motor cover part 7 and located substantially annularly immediately above coil part 6.

[0020]

Thus, a plurality of fins 11 are provided immediately above coil part 6 as a heat generating part of motor part 4. Therefore, even when the ceiling fan is operated and coil part 6 generates heat, the heated air in the vicinity of coil part 6 ascends to fin 11 part. By fin 11 , the heated air is efficiently exhausted into the room from second holes 16b through first space portion 10a. Furthermore, the air in the room is absorbed into motor part 4 from a plurality of first holes 16a of upper motor cover part 7. As a result, heat of the heated air in the vicinity of coil part 6 is wasted efficiently.

Thus, the temperature rise of coil part 6 can be reduced.

[0021]

Furthermore, first holes 16a of upper motor cover part 7 are located in the center side of upper motor cover part 7 relative to fins 11. A plurality of first holes 16a having a substantially circular shape are located substantially annularly in the center side of upper motor cover part 7 relative to fins 11 , that is, in the center side from coil part 6 as a heat generating part of motor part 4.

[0022]

That is to say, during operation of the ceiling fan, since plurality of plates 11a are rotated together with the upper motor cover part, the heated air in the vicinity of coil part 6 is allowed to flow in the centrifugal direction. Then, the heated air is exhausted into the room from second hole 16b through first space portion 10a between upper motor cover part 7 and rotor part 10. Furthermore, the air in the room is absorbed into motor part 4 from a plurality of first holes 16a of upper motor cover part 7. In other words, the heated air in the vicinity of coil part 6 and the air in the room, which is absorbed into motor part 4 from first hole 16a of upper motor cover part 7, are allowed to flow in the centrifugal direction. Therefore, the heated air in the vicinity of coil part 6 is exhausted into the room from second holes 16b through first space portion 10a and heat of the heated air is wasted. Furthermore, a part of the air in the room, which is absorbed into motor part 4 from first holes 16a of upper motor cover part 7, is sent to coil part 6, so that coil part 6 can be cooled. As a result, heat of the heated air in the vicinity of coil part 6 is efficiently wasted, so that coil part 6 can be cooled. Thus, the temperature rise of coil part 6 can be reduced. [0023]

Furthermore, upper motor cover part 7 is made of metal and fin 11 is formed of raised part l ib of upper motor cover part 7. Specifically, upper motor cover part 7 made of metal is cut in a substantially U-shape. Then, raised part 1 lb surrounded by this cut portion is folded downward of upper motor cover part 7 so as to form fin 11. In other words, upper motor cover part 7 and fin 11 are integrally formed.

[0024]

That is to say, raised part l ib of fin 1 1 , which is made of metal, is heated by the heated air in the vicinity of coil part 6. Herein, the heat is conducted from raised part 1 lb to upper motor cover part 7 and dissipated from the upper surface of upper motor cover part 7. Thus, the temperature rise of raised part l ib can be suppressed. In other words, since heat of coil part 6 can be efficiently conducted to upper motor cover part 7 by raised part l ib in the vicinity of coil part 6, the temperature rise of coil part 6 can be reduced.

[Example 2]

[0025]

Hereinafter, a ceiling fan in accordance with a second exemplary embodiment of the present invention is described with reference to drawings. In the second exemplary embodiment of the present invention, the same reference numerals are given to the same components as those in the first exemplary embodiment, and the description thereof is omitted.

[0026]

Fig. 3 is an outline view showing a ceiling fan in accordance with the second exemplary embodiment of the present invention. Fig. 4 is a sectional view showing a principal part of the ceiling fan. Fig. 5 is an outline plan view showing a principal part of the ceiling fan. Fig. 6 is a schematic view showing a principal part of the ceiling fan.

[0027]

As shown in Figs. 3 to 6, the second exemplary embodiment of the present invention is different from the first exemplary embodiment in that upper main body cover part 12 covering the upper portion of motor part 4 is provided. Specifically, main body part 3 includes motor part 4, blades 5, lower main body cover part 25, and upper main body cover part 12 covering the upper surface of motor part 4.

[0028]

Upper main body cover part 12 is made of resin and has a substantially bowl shape with the lower surface opened. Upper main body cover part 12 has, in a center, a substantially circular-shaped coupling hole 28 through which shaft 26 as coupling part 2 passes. In the periphery of coupling hole 28, a plurality of substantially elliptical-shaped holes 29 are formed substantially annularly. On the peripheral edge of upper main body cover part 12, a plurality of substantially elliptical-shaped outer peripheral holes 19 are formed substantially annularly. On the lower surface of upper main body cover part 12, first fins 11c, that is, a plurality of flat-shaped first plates l id extending downward are provided. First plate l id extends in the outer peripheral direction from the center of motor part 4, that is, extends radially and is disposed substantially annularly immediately above coil part 6.

[0029]

Upper motor cover part 7 has a plurality of substantially circular-shaped communicating holes 16c of first holes 16a in the center thereof. Herein, communicating holes 16c are located in the center side of upper motor cover part 7 relative to first fins 11c.

[0030]

Immediately above coil part 6, a plurality of fin holes 13 that are substantially rectangular-shaped openings are provided substantially annularly. Herein, fin holes 13 are provided in the periphery of communicating holes 16c. First plate l id extends to immediately above coil part 6 via fin hole 13. That is to say, first fin 11c is formed of first plate l id extending in the perpendicularly downward direction from upper main body cover part 12 via fin hole 13.

[0031]

In this way, a plurality of first plates l id as first fins 11c are provided immediately above coil part 6. Therefore, even when a ceiling fan is operated and coil part 6 generates heat, the heated air in the vicinity of coil part 6 ascends to the vicinity of first fins 1 1c. Then, by first fins 11c, heat of the heated air is efficiently dissipated into the room from first space portion 10a and outer peripheral holes 19. Then, the air in the room is absorbed into motor part 4 from a plurality of holes 29 of upper main body cover part 12 and a plurality of communicating holes 16c of upper motor cover part 7. As a result, heat of the heated air in the vicinity of coil part 6 is efficiently wasted. Thus, the temperature rise of coil part 6 can be reduced. Furthermore, since upper motor cover part 7 is made of resin, when coil part 6 and first plate l id are brought into contact with each other, the short circuit between coil part 6 and upper motor cover part 7 can be prevented.

[0032]

Furthermore, second space portion 30 is provided between upper main body cover part 12 and upper motor cover part 7. Specifically, second space portion 30 is provided between coupling hole 28 of upper main body cover part 12 and communicating hole 16c and fin hole 13 of upper motor cover part 7.

[0033]

That is to say, since second space portion 30 is provided between coupling hole 28 of upper main body cover part 12 and communicating hole 16c of upper motor cover part 7, coupling hole 28 of upper main body cover part 12 is not closed by upper motor cover part 7. Furthermore, airflow resistance from a plurality of holes 29 of upper main body cover part 12 and a plurality of communicating holes 16c of upper motor cover part 7 to the inside of motor part 4 can be reduced.

[0034]

Furthermore, upper main body cover part 12 has a substantially bowl shape, and first fin 1 1c is provided on inclined surface 31 of upper main body cover part 12. Specifically, upper main body cover part 12 is inclined upward so that upper main body cover part 12 is apart from upper motor cover part 7 between the vicinity immediately above rotor part 10 and a substantially circular-shaped coupling hole 28 in the center. Immediately above coil part 6 on inclined surface 31, first plate l id of first fin 11c is located. First plate l id extends downward from inclined surface 31 and has a substantially triangular sectional shape and a level surface at the bottom.

[0035]

That is to say, first plate l id as first fin 11c extends downward from inclined surface 31 and extends toward immediately above coil part 6 as a heat generation part of motor part 4 via fin hole 13 of upper motor cover part 7. In other words, as shown in Fig. 7 that is an enlarged view of a principal part of the ceiling fan in accordance with the second exemplary embodiment of the present invention, first plate l id includes plate upper part 11 f located on the upper portion of upper motor cover part 7 and plate lower part l ie located on the lower portion of upper motor cover part 7.

[0036]

Herein, when the ceiling fan is operated, since the heated air in the vicinity of coil part 6 ascends to the vicinity of plate lower part l ie, the heated air is efficiently exhausted into the room from first space portion 10a by plate lower part l ie. Then, the air in the room is absorbed into motor part 4 from a plurality of holes 29 of upper main body cover part 12 and a plurality of communicating holes 16c of upper motor cover part 7. Therefore, heat of the heated air in the vicinity of coil part 6 is efficiently wasted. Thus, the temperature rise of coil part 6 can be reduced.

[0037]

Furthermore, the air in the room is absorbed from a plurality of holes 29a in the center side of upper main body cover part 12 by plate upper part 1 If. Then, since the air absorbed from holes 29a flows along a part of the upper surface of upper main body cover part 12 and is exhausted into the room from a plurality of holes 29b at the peripheral edge side of upper main body cover part 12, upper main body cover part 12 can be cooled. As a result, the temperature rise of motor part 4 can be reduced.

[0038]

Furthermore, fin holes 13 of upper motor cover part 7 includes first fin 11c at the upstream side in the rotation direction N of blade 5 and gap 13a at the downstream side thereof. Since first fin 11c is located at the upstream side in the rotation direction N of fin holes 13 of upper motor cover part 7, gap 13a opening at the downstream side is formed.

[0039] That is to say, even when the ceiling fan is operated and coil part 6 generates heat, the heated air in the vicinity of coil part 6 ascends to the vicinity of first fin 1 1c. Therefore, the heated air is efficiently exhausted into the room from first space portion 10a and outer peripheral holes 19 by first fin 11c. Then, the air in the room is absorbed into motor part 4 from a plurality of holes 29a of upper main body cover part 12 and a plurality of communicating holes 16c of upper motor cover part 7. The air in the room is absorbed into motor part 4 also from a plurality of holes 29a of upper main body cover part 12 and gap 13a of upper motor cover part 7. As a result, the temperature rise of motor part 4 can be reduced.

[0040]

The ceiling fan in accordance with the second exemplary embodiment of the present invention includes a plurality of second fins 18 on peripheral edge 17 of upper main body cover part 12. Second fin 18 is formed of second plate 18a extending in the outer peripheral direction from the center of motor part 4. On the lower surface of upper main body cover part 12, a plurality of second fins 18 are provided on peripheral edge 17 that is peripheral edge side relative to first fin 11c. A plurality of second plates 18a as second fins 18 extend radially on the lower surface of upper motor cover part 7, and located on peripheral edge 17 substantially annularly.

[0041]

That is to say, even when a ceiling fan is operated and coil part 6 generates heat, the heated air in the vicinity of coil part 6 ascends to the vicinity of first fin 1 1c. Therefore, the heated air is sent in the centrifugal direction by first plate l id, sucked by second plate 18a through first space portion 10a and sent in the centrifugal direction. Thus, the heated air is exhausted into the room from outer peripheral hole 19 by first plate l id. Furthermore, the air in the room is absorbed into motor part 4 from a plurality of holes 29 of upper main body cover part 12 and a plurality of communicating holes 16c of upper motor cover part 7 through first plate l id and second plate 18a.

[0042]

In other words, since first fin 11c is located above coil part 6 as a heat generating part and second fin 18 is located at the outer peripheral part of coil part 6, the heated air in the vicinity of coil part 6 is allowed to flow in the centrifugal direction and dispersed in first space portion 10a by first plate l id. The dispersed air is absorbed through second plate 18a, and exhausted into the room from outer peripheral holes 19. Therefore, dispersion of the heated air in the vicinity of coil part 6 into motor part 4 can be suppressed. As a result, since the heated air in the vicinity of coil part 6 is efficiently exhausted into the room. Thus, the temperature rise of motor part 4 can be reduced.

[0043]

Furthermore, the ceiling fan in accordance with the second exemplary embodiment of the present invention includes a plurality of outer peripheral holes 19 in the vicinity of second fin 18 of upper main body cover part 12. That is to say, in peripheral edge 17, that is, in the vicinity of second fin 18 of upper main body cover part 12, a plurality of outer peripheral holes 19 that are openings are provided substantially annularly.

[0044]

That is to say, the air that is allowed to flow in the centrifugal direction by second fin 18 is efficiently exhausted into the room from outer peripheral holes 19 of peripheral edge 17. As a result, heat of the heated air in the vicinity of coil part 6 is efficiently wasted. Thus, the temperature rise of coil part 6 can be reduced.

[0045]

Furthermore, peripheral edge 17 of upper main body cover part 12 is inclined surface 20. That is to say, peripheral edge 17 is inclined downward toward the outer periphery. This inclined portion is defined as inclined surface 20. A plurality of second plates 18a as second fins 18 and a plurality of outer peripheral holes 19 are located on inclined surface 20. First plate l id extends downward from inclined surface 20 and has a substantially triangular sectional shape and a level surface at the bottom.

[0046]

That is to say, since a plurality of outer peripheral holes 19 are located in the centrifugal direction of second fin 18, the heated air is efficiently allowed to flow in the centrifugal direction by second fm 18, and can be efficiently exhausted into the room from outer peripheral holes 19 on peripheral edge 17.

[0047]

Furthermore, the number of second fins 18 is made to be larger thaii the number of first fins 11c. Fig. 8 is a graph showing an effect of cooling the temperature of the motor of the ceiling fan in accordance with the second exemplary embodiment of the present invention. Fig. 8 shows the relation between the number of fins and the effect of cooling the temperature of motor part 4. As shown in this graph, when the number of second fins 18 is larger than the number of first fins 11c, the cooling effect is higher. However, the reason for this has not been sufficiently elucidated.

[0048]

Furthermore, Fig. 9 is an outline perspective view showing a principal part of the ceiling fan in accordance with the second exemplary embodiment of the present invention. As shown in Fig. 9, expanded portion 21 is provided on peripheral edge 17 of upper main body cover part 12, and opening 22 is provided in expanded portion 21 at the upstream side in the rotation direction N of blade 5. A part of inclined surface 20 that is peripheral edge 17 of upper main body cover part 12 is expanded in the outer peripheral direction to form expanded portion 21, and expanded portion 21 has opening 22 that is opened at the upstream side in the rotation direction N of blade 5.

[0049]

That is to say, when upper main body cover part 12 is rotated, air flows to outer peripheral surface 21a of expanded portion 21 in the direction from the downstream side to the upstream side in the rotation direction of blade 5. It is thought that this airflow, that is, induced flow 32 induces the air inside the upper main body cover part 12 into the room from opening 22 of expanded portion 21. As a result, the heated air in the vicinity of coil part 6 is efficiently wasted and the temperature rise of coil part 6 can be reduced.

[0050]

Furthermore, a plurality of third fins 23 are provided on the upper portion of rotor part 10. Third fin 23 is formed of third plate 23a extending in the outer peripheral direction from the center of motor part 4. A plurality of third plates 23a as third fins 23 extend radially to the upper portion of rotor part 10, that is, to the peripheral edge of upper motor cover part 7.

[0051]

That is to say, during operation of the ceiling fan, since first fin 11c is rotated together with upper motor cover part 7, the heated air in the vicinity of coil part 6 is allowed to flow in the centrifugal direction. This flowing air flows directly to third fin 23 of rotor part 10, or is led to third fin 23 of rotor part 10 by edge wall part 7b extending downward from the peripheral edge of a substantially bowl-shaped upper motor cover part 7. Then, the heated air is allowed to flow in the centrifugal direction to the upper portion of rotor part 10 by a plurality of third fins 23, and allowed to flow to second fin 18 through first space portion 10a. Furthermore, the air is exhausted into the room from outer peripheral hole 19 through second fin 18. Furthermore, the air in the room is absorbed into motor part 4 from a plurality of communicating holes 16c of upper motor cover part 7. That is to say, since third fin 23 is provided between first fin 11c and second fin 18, these three fins are adjacent to each other between the upper portion of rotor part 10 and outer peripheral hole 19. Therefore, dispersion of the heated air inside motor part 4 is suppressed, and air can be efficiently sent from first fin 1 1c to third fin 23, and from third fin 23 to second fin 18. As a result, heat of the heated air in the vicinity of coil part 6 is efficiently wasted and the temperature rise of coil part 6 can be reduced.

[0052]

Furthermore, since rotor part 10 is rotated while generating a magnetic field, rotor part 10 itself generates heat. A part of the generated heat can be exhausted into the room from outer peripheral holes 19 by the air flowing from first fin 11c to third fin 23 and from third fin 23 to second fin 18. Thus, the temperature rise of rotor part 10 can be reduced.

[0053]

Furthermore, a plurality of fourth fins 24 are provided on the lower part of rotor part 10. Fourth fin 24 is formed of fourth plate 24a extending in the outer peripheral direction from the center of motor part 4. A plurality of fourth plates 24a as fourth fins 24 extend radially to the lower portion of rotor part 10.

[0054]

That is to say, during operation of the ceiling fan, since first fin 11c is rotated together with upper motor cover part 7, the heated air in the vicinity of coil part 6 is allowed to flow in the centrifugal direction. The flowing air is allowed to flow to the lower portion of rotor part 10 in the centrifugal direction by a plurality of fourth fins 24. Furthermore, the heated air is exhausted into the room by second fin 18. Furthermore, the air in the room is absorbed into motor part 4 from a plurality of communicating holes 16c of upper motor cover part 7. As a result, heat of the heated air in the vicinity of coil part 6 is efficiently wasted. Thus, the temperature rise of coil part 6 can be reduced.

[0055]

Furthermore, the dimension in the perpendicular direction of third fin 23 is longer than that of fourth fin 24. In other words, the dimension in the vertical direction of third fin 23 at the upper portion of rotor part 10 is longer than that of fourth fin 24 at the lower portion of rotor part 10.

[0056]

The heated air gathers in the upper portion as compared with in the lower portion of rotor part 10. Therefore, by making the dimension in the vertical direction of third fin 23 in the upper portion of rotor part 10 be longer than that of fourth fin 24 in the lower portion of rotor part 10, heat can be wasted efficiently. Thus, the temperature rise of coil part 6 can be reduced.

[0057]

Furthermore, the number of third fins 23 is made to be larger than that of fourth fins 24. As shown in Fig. 8, the cooling effect becomes higher as the number of fins is increased.

[0058]

Note here that the shapes of first fin 11c, second Fin 18, third fin 23, and fourth fin 24 are determined for the purpose of generating a flow in the outer peripheral direction. Therefore, they may be formed with an angle with respect to the outer peripheral direction, or may be formed in a curved shape having a substantially arch shape.

[0059]

Furthermore, second fin 18 and third fin 23 may be produced as a part of the rotor and formed of, for example, metal such as aluminum die cast. Thus, heat of the heated air is conducted to second fin 18 and third fin 23, and easily dissipated to the outside of motor part 4.

[0060]

In this way, during operation of the ceiling fan, motor part 4, first fin 11c, second fin 18, third fin 23 and fourth fin 24 are rotated. The airflow is generated inside motor part 4, and heat of the heated air in the vicinity of coil part 6 is efficiently wasted. Then, the temperature rise of coil part 6 can be suppressed. Thus, the increase in cost and weight of motor part 4 as a product can be prevented without increasing the core thickness of stator 9 and rotor part 10.

[Industrial Applicability]

[0060]

As mentioned above, a ceiling fan of the present invention can be used for household use or office use.

[Reference Signs List]

1 ceiling 2 coupling part

3 main body part

4 motor part

5 blade

6 coil part

7 upper motor cover part 7a connecting means

8 lower motor cover part

9 stator

10 rotor part

10a first space portion

11 fin

11a plate

l ib raised part

11c first fin

l id first plate

l ie plate lower part

1 If plate upper part

12 upper main body cover part 13 fin hole

13a gap

16a first hole

16b second hole

16c communicating hole 17 peripheral edge

18 second fin

18a second plate 19 outer peripheral hole

20 inclined surface

21 expanded portion

22 opening

23 third fin

23a third plate

24 fourth fin

24a fourth plate

25 lower main body cover part 26 shaft

27 bearing

28 connection hole

29, 29a, 29b hole

30 second space portion 31 inclined surface

32 induced flow

Claims

[CLAIMS]

[Claim 1]

A ceiling fan comprising:

a coupling part fixed to a ceiling;

a main body part provided on a lower portion of the coupling part; and

a motor part provided on the main body part, the motor part including:

a coil part;

an upper motor cover part covering an upper portion of the coil part;

a lower motor cover part covering a lower portion of the coil part; and

a rotor part located at an outer periphery of the coil part, wherein the rotor part is provided with a plurality of blades in a horizontal direction, the upper motor cover part and the rotor part are provided integrally and rotatably to the coupling part, and a first space portion is provided between the upper motor cover part and the rotor part, wherein the upper motor cover part has a plurality of first holes and a plurality of second holes, and the second holes are located at an outer periphery relative to the first holes, and

a plurality of fins are provided on a lower surface of the upper motor cover part.

[Claim 2]

A ceiling fan comprising:

a coupling part fixed to a ceiling;

a main body part provided on a lower portion of the coupling part; and

a motor part provided on the main body part, the motor part including:

a coil part;

an upper motor cover part covering an upper portion of the coil part;

a lower motor cover part covering a lower portion of the coil part; and

a rotor part located at an outer periphery of the coil part, wherein the rotor part is provided with a plurality of blades in a horizontal direction, the upper motor cover part and the rotor part are provided integrally and rotatably to the coupling part, and a first space portion is provided between the upper motor cover part and the rotor part, wherein the upper motor cover part includes first holes in a center thereof and a plurality of fin holes around the first holes,

an upper main body cover part covering an upper portion of the motor is provided,

the upper main body cover part includes a connection hole in a center thereof, a plurality of holes in a periphery of the connection holes, first fins and outer peripheral holes on a peripheral edge, and

the first fin is formed of a plate extending in a perpendicularly downward direction from the upper main body cover part via the fin hole.

[Claim 3]

The ceiling fan of claim 1 , wherein the fin is formed of a plate extending in an outer peripheral direction from a center of the motor part.

[Claim 4]

The ceiling fan of claim 1 , wherein the fin is located immediately above the coil part.

[Claim 5]

The ceiling fan of claim 2, wherein the first fin is formed of a first plate extending in an outer peripheral direction from a center of the motor part.

[Claim 6]

The ceiling fan of claim 2, wherein the first fin is located immediately above the coil part.

[Claim 7]

The ceiling fan of claim 1, wherein the first hole is located in a center side of the upper motor cover part relative to the fin.

[Claim 8]

The ceiling fan of claim 1 , wherein the upper motor cover part is made of metal, and the fin is formed of a raised part of the upper motor cover part.

[Claim 9]

The ceiling fan of claim 2, wherein a second space portion is provided between the upper main body cover part and the upper motor cover part.

[Claim 10]

The ceiling fan of claim 2, wherein the upper main body cover part has a bowl shape, and the first fin is provided on an inclined surface of the upper main body cover part.

[Claim 11]

The ceiling fan of claim 2, wherein the fin hole includes the first fin at an upstream side in a rotation direction of the blade, and a gap at a downstream side in the rotation direction of the blade.

[Claim 12]

The ceiling fan of claim 2, wherein a plurality of second fins are provided on a peripheral edge of the upper main body cover part.

[Claim 13]

The ceiling fan of claim 12, wherein the second fin is formed of a second plate extending in an outer peripheral direction from a center of the motor part.

[Claim 14]

The ceiling fan of either claim 12 or 13, wherein a plurality of the outer peripheral holes are provided in a vicinity of the second fins.

[Claim 15]

The ceiling fan of either claim 12 or 13, wherein the second fins are provided on an inclined surface of the upper main body cover part.

[Claim 16]

The ceiling fan of either claim 12 or 13, wherein the number of the second fins is larger than the number of the first fins.

[Claim 17]

The ceiling fan of claim 2, wherein an expanded portion is provided on a peripheral edge of the upper main body cover part, and an opening is provided at an upstream side of the expanded portion in a rotation direction of the blade.

[Claim 18]

The ceiling fan of claim 2, wherein a plurality of third fins are provided on an upper portion of the rotor part.

[Claim 19]

The ceiling fan of claim 18, wherein the third fin is formed of a third plate extending in an outer peripheral direction from a center of the motor part.

[Claim 20]

The ceiling fan of claim 2, wherein a plurality of fourth fins are provided on a lower portion of the rotor part.

[Claim 21]

The ceiling fan of claim 20, wherein the fourth fin is formed of a fourth plate extending in an outer peripheral direction from a center of the motor part.

[Claim 22]

The ceiling fan of claim 17, wherein the third fin has a dimension longer than a dimension of the fourth fin in a perpendicular direction.

[Claim 23]

The ceiling fan of claim 18, wherein the number of the third fins is larger than the number of the fourth fins.