Ceiling fan

Abstract

To prevent the drop of a blade shaft or a blade.SOLUTION: A ceiling fan 1 includes a rotary shaft 20 to be rotationally driven by a motor 10, a rotary shaft support part 30 supporting the rotary shaft 20, a plurality of blade shafts 50 radially mounted to the rotary shaft 20 and adapted to be rotated integrally with the rotary shaft 20, a plurality of blades 60 supported by the plurality of blade shafts 50, respectively, and a first wire 70 connecting the plurality of blade shaft 50 to one another.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ceiling fan.

Background Art

[0002] Patent Document 1 describes a ceiling fan 100 that is attached to the ceiling of a facility such as a factory and generates an air flow. As shown in FIG. 4, the ceiling fan 100 has a rotating shaft 102 that is rotationally driven by a motor 101 and a rotating shaft support portion 103 that supports the rotating shaft 102. Further, the ceiling fan 100 has a plurality of blade shafts 104 that are attached radially with respect to the rotating shaft 102 and rotate integrally with the rotating shaft 102, and a plurality of blades 105 that are respectively supported by the plurality of blade shafts 104.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the ceiling fan 100 of Patent Document 1, for example, when any one of the plurality of blade shafts 104 or the plurality of blades 105 is damaged by an impact, there is a risk that the damaged blade shaft 104 or blade 105 may fall.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to prevent the blade shaft and the blade from falling.

Means for Solving the Problems

[0006] The sealing fan of aspect 1 includes a rotating shaft that is rotationally driven by a motor, a rotating shaft support portion that supports the rotating shaft, a plurality of blade shafts that are radially attached to the rotating shaft and rotate integrally with the rotating shaft, a plurality of blades that are respectively supported by the plurality of blade shafts, and an annular first wire that connects the plurality of blade shafts to each other. According to this configuration, since the annular first wire connects the plurality of blade shafts, for example, even if a blade shaft is damaged due to impact, the first wire can prevent the blade shaft from falling. Or, even when the amplitude of the blade increases due to metal fatigue and leads to breakage, the first wire can prevent the blade shaft from falling.

[0007] Aspect 2 is the sealing fan of aspect 1, wherein the first wire connects the plurality of blade shafts to each other at the ends of the plurality of blade shafts on the rotating shaft side. According to this configuration, since the first wire is provided at the end of the blade shaft on the rotating shaft side, the presence of the first wire is less likely to interfere with the rotation of the blade. Therefore, even with the first wire, the blade can rotate smoothly.

[0008] The sealing fan of aspect 3 includes a rotating shaft that is rotationally driven by a motor, a rotating shaft support portion that supports the rotating shaft, a plurality of blade shafts that are radially attached to the rotating shaft and rotate integrally with the rotating shaft, a plurality of blades that are respectively supported by the plurality of blade shafts, a second wire that connects the plurality of blades to each other, and a sensor that is attached to the second wire and detects abnormalities of the blades. According to this configuration, since the sensor is attached to the second wire, the sensor can detect abnormalities of all the blades. When the sensor detects an abnormality of the blade, for example, by stopping the rotation of the blade, the fall of the blade can be prevented.

[0009] Aspect 4 is the sealing fan of Aspect 3, wherein both ends of the second wire are respectively attached to different blades. According to this configuration, it becomes easy to attach the second wire to the blade.

[0010] Aspect 5 is the sealing fan of Aspect 4, wherein the sensor is provided at the end of the second wire. According to this configuration, since the sensor can play a role of fixing one end of the second wire to the blade, a sealing fan with a simpler configuration and high safety can be obtained.

Advantages of the Invention

[0011] According to the sealing fan of the present invention, it is possible to prevent the blade shaft and the blade from falling.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0013] <First Embodiment> The first embodiment of the sealing fan will be described. As shown in FIG. 1, the sealing fan 1 includes a motor 10, a rotating shaft 20, a rotating shaft support portion 30, a ceiling fixture 40, a plurality of blade shafts 50, a plurality of blades 60, and a first wire 70.

[0014] (Motor 10) The motor 10 is of the quadrature-axis type. The motor 10 may be of the parallel-axis type or the direct drive type. The motor 10 is fixed to the side surface of the rotary shaft support portion 30. When the motor 10 is driven, the rotary shaft 20, which will be described later, rotates.

[0015] (Rotary shaft 20) The rotary shaft 20 is formed in a hollow cylindrical shape extending in the vertical direction. The rotary shaft 20 is rotationally driven by the motor 10 with the vertical direction as the axial direction. Since a blade shaft 50, which will be described later, is attached to the rotary shaft 20, the rotary shaft 20 rotates integrally with the blade shaft 50.

[0016] (Rotary shaft support portion 30) The rotary shaft support portion 30 supports the rotary shaft 20. The motor 10 is attached to the side surface of the rotary shaft support portion 30. A ceiling fixture 40, which will be described later, is attached to the upper surface of the rotary shaft support portion 30. That is, the motor 10, the rotary shaft 20, and the ceiling fixture 40 are integrated via the rotary shaft support portion 30.

[0017] (Ceiling fixture 40) The ceiling fixture 40 has a support column 41. The support column 41 is attached to the upper surface of the rotary shaft support portion 30 so as to protrude upward. By fixing the ceiling fixture 40 to the ceiling of a facility such as a factory, the sealing fan 1 is fixed to the ceiling.

[0018] (Blade shaft 50) The blade shaft 50 is long and has a hollow square bar shape. The blade shaft 50 is attached radially with respect to the rotation shaft 20. Therefore, the blade shaft 50 rotates integrally with the rotation shaft 20. A total of six blade shafts 50 are provided at intervals of 60 degrees around the rotation shaft 20. Each of the six blade shafts 50 supports a blade 60, which will be described later. The number of blade shafts 50 is preferably from 3 to 10, more preferably from 4 to 6, based on the balance between the weight of the blade 60 and the blowing effect. The blade shafts 50 are preferably provided at equal angular intervals around the rotation shaft 20 according to the number of blades 60. At the end of the blade shaft 50 on the side of the rotation shaft 20, the blade 60 is not supported and the blade shaft 50 is exposed.

[0019] (Blade 60) The blades 60 are respectively supported by the six blade shafts 50. At the blade 60, the front end in the rotation direction is defined as the front end, and the rear end in the rotation direction is defined as the rear end. The blade 60 is formed in an airfoil shape (NACA airfoil) with a rounded front end and tapering towards the rear end. The number of blades 60 is preferably from 3 to 10, more preferably from 4 to 6, similar to the blade shaft 50.

[0020] (First wire 70) As shown in FIGS. 1 and 2, the first wire 70 is passed through an eye nut 71 provided at the end of the blade shaft 50 on the side of the rotation shaft 20 and is formed in a ring shape. The first wire 70 connects the six blade shafts 50 to each other. In FIG. 2, the ceiling fixture 40 is omitted.

[0021] <Actions and effects of the first embodiment> The actions and effects of the first embodiment will be described. (1-1) The sealing fan 1 has a rotating shaft 20 that is rotationally driven by a motor 10, a rotating shaft support portion 30 that supports the rotating shaft 20, and a plurality of blade shafts 50 that are radially attached to the rotating shaft 20 and rotate integrally with the rotating shaft 20. Further, the sealing fan 1 has a plurality of blades 60 respectively supported by the plurality of blade shafts 50, and an annular first wire 70 that connects the plurality of blade shafts 50 to each other. According to this configuration, since the annular first wire 70 connects the plurality of blade shafts 50, for example, even if the blade shaft 50 is damaged due to an impact, the first wire 70 can prevent the blade shaft 50 from falling. Or, even when the amplitude of the blade 60 increases due to metal fatigue and leads to breakage, the first wire 70 can prevent the blade shaft 50 from falling.

[0022] (1-2) The first wire 70 connects the plurality of blade shafts 50 to each other at the end portions on the rotating shaft side of the plurality of blade shafts 50. According to this configuration, since the first wire 70 is provided at the end portion of the blade shaft 50 on the rotating shaft 20 side, the presence of the first wire 70 is less likely to interfere with the rotation of the blade 60. Therefore, even with the first wire 70, the blade 60 can rotate smoothly.

[0023] <Second Embodiment> A second embodiment of the sealing fan 1 will be described. In the embodiment described below, the differences from the first embodiment will be mainly described, and the same components as those in the first embodiment may be denoted by the same reference numerals, and part or all of the description may be omitted.

[0024] As shown in FIG. 3, the sealing fan 1 in the second embodiment has a motor 10, a rotating shaft 20, a rotating shaft support portion 30, a ceiling fixture (not shown), and a plurality of blade shafts 50. Further, the sealing fan 1 has a plurality of blades 60, a second wire 80, and a sensor 90. The sealing fan 1 of the second embodiment does not have an annular first wire 70 that connects the plurality of blade shafts 50 to each other.

[0025] (Second wire 80) As shown in FIG. 3, the second wire 80 is attached to the upper surface of the blade 60. The second wire 80 is attached at a position on the rotation axis side in the longitudinal direction of the blade 60, that is, at a position closer to the rotation axis 20 in the blade 60. The second wire 80 is attached on the upper extension of the portion of the blade 60 where the blade shaft 50 is provided. The second wire 80 is attached to all six blades 60 and connects the six blades 60 to each other. Note that both ends of the second wire 80 are attached to another blade 60. That is, the second wire 80 is not configured in a ring shape.

[0026] The method of attaching the second wire 80 to the blade 60 is not particularly limited. For example, by providing a through hole in the upper surface of the blade 60 and inserting the second wire 80 through this through hole, the second wire 80 can be attached to the blade 60. A jig such as a rivet may be attached to the upper surface of the blade 60, and the second wire 80 may be attached to this jig.

[0027] (Sensor 90) The sensor 90 is on the upper surface of the blade 60 and is attached to the end of the second wire 80. The sensor 90 is for detecting an abnormality of the blade 60, and examples include a limit switch. The sensor 90 may be configured to stop the rotation of the blade 60 when an abnormality of the blade 60 is detected. For example, the ceiling fan 1 may have a control unit that controls the rotation of the motor 10, and may be configured to transmit a signal from the sensor 90 to the control unit to stop the rotation of the motor 10. Note that the abnormality of the blade 60 is not particularly limited, but examples include cases where the amplitude of the blade 60 increases due to metal fatigue, or cases where the vibration or position of the blade 60 exceeds the allowable range.

[0028] The method of attaching the sensor 90 to the blade 60 is not particularly limited. The sensor 90 may be directly attached to the upper surface of the blade 60, or a jig such as a rivet may be attached to the upper surface of the blade 60, and the sensor 90 may be attached to this jig.

[0029] <Actions and effects of the second embodiment> The actions and effects of the second embodiment will be described. (2-1) The sealing fan 1 has a rotating shaft 20 that is rotationally driven by a motor 10, a rotating shaft support portion 30 that supports the rotating shaft 20, and a plurality of blade shafts 50 that are radially attached to the rotating shaft 20 and rotate integrally with the rotating shaft 20. Further, the sealing fan 1 has a plurality of blades 60 respectively supported by the plurality of blade shafts 50, a second wire 80 that connects the plurality of blades 60 to each other, and a sensor 90 that is attached to the second wire 80 and detects abnormalities in the blades 60. According to this configuration, since the sensor 90 is attached to the second wire 80, the sensor 90 can detect abnormalities in all the blades 60. When the sensor 90 detects an abnormality in the blade 60, for example, the rotation of the blade 60 can be stopped to prevent the blade 60 from falling.

[0030] (2-2) Both ends of the second wire 80 are attached to different blades 60 respectively. According to this configuration, it becomes easy to attach the second wire 80 to the blade 60.

[0031] (2-3) The sensor 90 is provided at the end of the second wire 80. According to this configuration, since the sensor 90 can serve to fix one end of the second wire 80 to the blade 60, a sealing fan 1 with a simpler configuration and high safety can be obtained.

[0032] <Modification example> The first embodiment and the second embodiment (hereinafter also collectively referred to as the present embodiment) can be implemented with the following modifications. The present embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0033] · In this embodiment, the blade 60 was formed in the NACA airfoil, but is not limited to this aspect. The blade 60 can adopt a known airfoil. · In this embodiment, the first wire 70 was passed through the eye nut 71 and formed in a ring shape, but is not limited to this aspect. The first wire 70 may be directly fixed to the blade shaft 50 to connect a plurality of blade shafts 50 to each other.

[0034] · In the first embodiment, the first wire 70 connected a plurality of blade shafts 50 to each other at the end of the plurality of blade shafts 50 on the side of the rotation axis 20, but is not limited to this aspect. The first wire 70 may connect a plurality of blade shafts 50 to each other at a location other than the end of the plurality of blade shafts 50 on the side of the rotation axis 20, for example, at the end of the blade shaft 50 opposite to the end on the side of the rotation axis 20.

[0035] · In the sealing fan 1 of the first embodiment, it may further have a second wire 80 and a sensor 90. · A sensor for detecting an abnormality of the blade shaft 50 may be attached to the first wire 70.

[0036] · The second wire 80 may be configured in a ring shape. · In the second embodiment, both ends of the second wire 80 were attached to different blades 60 respectively, but are not limited to this aspect. Both ends of the second wire 80 may be attached to the same blade 60.

[0037] ·In the second embodiment, the sensor 90 was provided at the end of the second wire 80, but is not limited to this mode. The sensor 90 may be provided at a location other than the end of the second wire 80, for example, at the central portion of the second wire 80.

[0038] ·In the second embodiment, the sensor 90 was configured to stop the rotation of the blade 60 when an abnormality of the blade 60 was detected, but is not limited to this mode. The sensor 90 may be configured to slow down the rotation speed of the blade 60 for at least a certain period of time when an abnormality of the blade 60 is detected. Alternatively, the sensor 90 may be configured to transmit the detection of the abnormality of the blade 60 to other devices. Examples of other devices include a notification device that notifies of the abnormality, a control unit that controls the sealing fan 1, and the like.

Explanation of reference numerals

[0039] 1...Sealing fan, 10...Motor, 20...Rotating shaft, 30...Rotating shaft support portion, 50...Blade shaft, 60...Blade, 70...First wire, 80...Second wire, 90...Sensor.

Claims

1. A rotating shaft that is rotationally driven by a motor, A rotating shaft support portion that supports the rotating shaft, A plurality of blade shafts that are radially attached to the rotating shaft and rotate integrally with the rotating shaft, A plurality of blades respectively supported by the plurality of blade shafts, An annular first wire that connects the plurality of blade shafts to each other, Characterized by having, A sealing fan.

2. The first wire connects the plurality of blade shafts to each other at the ends of the plurality of blade shafts on the rotating shaft side. The sealing fan according to Claim 1.

3. A rotating shaft that is rotationally driven by a motor, A rotating shaft support portion that supports the rotating shaft, A plurality of blade shafts that are radially attached to the rotating shaft and rotate integrally with the rotating shaft, A plurality of blades respectively supported by the plurality of blade shafts, A second wire that connects the plurality of blades to each other, A sensor attached to the second wire for detecting abnormalities in the blades, Characterized by having, A sealing fan.

4. Both ends of the second wire are respectively attached to different ones of the blades. The sealing fan according to Claim 3.

5. The sensor is provided at an end of the second wire. The sealing fan according to Claim 4.

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