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WO2019130441A1 - Rotor blade, axial-flow blower, and ceiling fan - Google Patents

Rotor blade, axial-flow blower, and ceiling fan Download PDF

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Publication number
WO2019130441A1
WO2019130441A1 PCT/JP2017/046753 JP2017046753W WO2019130441A1 WO 2019130441 A1 WO2019130441 A1 WO 2019130441A1 JP 2017046753 W JP2017046753 W JP 2017046753W WO 2019130441 A1 WO2019130441 A1 WO 2019130441A1
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WO
WIPO (PCT)
Prior art keywords
blade
mounting plate
axis
center
blade mounting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/046753
Other languages
French (fr)
Japanese (ja)
Inventor
青木　普道
比出晴 小野
真裕 上田
哲也 福嶋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2017/046753 priority Critical patent/WO2019130441A1/en
Priority to JP2019561444A priority patent/JP6789414B2/en
Priority to MYPI2020003201A priority patent/MY184176A/en
Priority to CN201780096157.0A priority patent/CN111492145B/en
Publication of WO2019130441A1 publication Critical patent/WO2019130441A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings

Definitions

  • the present invention relates to an axial fan provided with a rotor for an axial fan, a rotor and a motor, and a ceiling fan installed on a ceiling.
  • Patent Document 1 discloses a ceiling fan in which a recess is provided in a blade to improve fatigue strength against repeated load in long-term use.
  • Patent Document 1 Although the strength of the blade can be improved, additional processing for providing a recess in the blade is required, and the number of manufacturing steps increases.
  • the present invention has been made in view of the above, and it is an object of the present invention to obtain a rotor for an axial flow fan in which the strength of the blades is improved without performing additional processing.
  • the present invention is a blade mounting plate fixed to a shaft of a motor for rotation, and a fastening member joined to the blade mounting plate by a fastening member and rotating together with the blade mounting plate a shaft And an impeller for forming an air flow along the
  • the blade has a blade mounting portion joined to a blade mounting plate by a fastening member, and a blade portion that generates an air flow.
  • the center of gravity of the blade is the plate thickness of the blade at the portion where the fastening member positioned on the foremost side in the rotational direction of the blade mounting plate fixes the blade mounting portion to the blade mounting plate in the axial direction of the rotary shaft of the blade mounting plate.
  • the rotor according to the present invention has an effect that the strength of the blade can be improved without performing additional processing.
  • FIG. 1 The perspective view of the ceiling fan which concerns on Embodiment 1 of this invention
  • FIG. 1 Side view of the rotor fan of the ceiling fan according to the first embodiment
  • Front view of a rotary fan of a ceiling fan according to Embodiment 1 Schematic diagram of the rotor of the ceiling fan according to the first embodiment The figure which shows the relationship between the rotation speed of the ceiling fan which concerns on Embodiment 1, and the distance in the axial direction of the rotating shaft of the blade
  • FIG. 1 is a perspective view of a ceiling fan according to Embodiment 1 of the present invention.
  • the ceiling fan 100 includes a suspending portion 1 hooked to a hook attached to the ceiling, a motor 3 as a power source, a pipe 2 connecting the suspending portion 1 and the motor 3, and a rotation driven by the motor 3
  • the wing 6 is provided.
  • the ceiling fan 100 is an axial flow fan provided with the motor 3 and the rotary wings 6, and the motor 3 is installed on the ceiling with the shaft of the motor 3 along the vertical direction.
  • FIG. 2 is a perspective view of the rotary wing of the ceiling fan according to the first embodiment.
  • FIG. 3 is a side view of the rotary wing of the ceiling fan according to the first embodiment.
  • the rotary wing 6 is provided with a blade mounting plate 4 which is attached to the shaft of the motor 3 and rotates, and a blade 5 joined to the blade mounting plate 4 and radially extending around a rotation axis AX of the blade mounting plate 4.
  • the blade 5 includes a blade mounting portion 5 a fixed to the blade mounting plate 4 and a blade 5 b generating an air flow.
  • the blade portion 5 b is inclined with respect to a plane perpendicular to the shaft of the motor 3.
  • the blade attachment portion 5a and the blade portion 5b are integrally formed.
  • FIG. 4 is a front view of the rotary wing of the ceiling fan according to the first embodiment.
  • FIG. 4 shows a state in which the rotary wing 6 is viewed from the direction shown by the arrow v in FIG.
  • the blade mounting portion 5 a is fixed to the blade mounting plate 4 by two fastening members 7.
  • the center C1 of the plate thickness of the blade 5 at the portion where the fastening member 7 located forward in the rotational direction fixes the blade attachment portion 5a to the blade attachment plate 4 and the fastening member located rearward in the rotational direction 7 is perpendicular to the rotation axis AX of the blade mounting plate 4 through the midpoint C3 of the line connecting the blade mounting portion 5a to the blade thickness plate center C2 at the portion fixing the blade mounting portion 5a to the blade mounting plate 4
  • the plane is defined as the plane L perpendicular to the axis.
  • a plane perpendicular to the rotation axis AX of the blade mounting plate 4 can be defined as an axis-perpendicular plane L through a midpoint of a line connecting the center of the plate thickness of 5 and the center of the plate thickness.
  • FIG. 5 is a front view of the rotary wing of the ceiling fan according to the first embodiment. Even when the blade mounting portion 5a is inclined with respect to the rotation axis AX, the plate thickness of the blade 5 at the portion where the fastening member 7 located forward in the rotational direction fixes the blade mounting portion 5a to the blade mounting plate 4 Middle point C3 of a line connecting the center C1 of the blade and the center C2 of the plate thickness of the blade 5 at the portion where the fastening member 7 located at the rear in the rotational direction fixes the blade mounting portion 5a to the blade mounting plate 4 A plane perpendicular to the rotation axis AX of the blade mounting plate 4 can be defined as an axis perpendicular plane L.
  • FIG. 1 is a front view of the rotary wing of the ceiling fan according to the first embodiment.
  • a plane perpendicular to the rotation axis AX of the blade mounting plate 4 can be defined as an axis-perpendicular plane L through a midpoint of a line connecting the center of the plate thickness of 5 and the center of the plate thickness.
  • the rotary wings 6 rotate with the shaft. Since the blade portion 5b is inclined with respect to a plane perpendicular to the shaft of the motor 3, the rotation of the rotary blade 6 generates an air flow in the direction indicated by the arrow A in FIG.
  • the ceiling fan 100 shown in FIG. 1 includes five blades 5, but the number of the blades 5 may be two or more, and is not limited to five.
  • the five blades 5 of the ceiling fan 100 have the same shape.
  • FIG. 6 is a schematic view of a rotary wing of a ceiling fan according to the first embodiment.
  • the center of gravity G of the blade 5 is the position of the center of gravity of one blade 5 and is lower than the plane L perpendicular to the rotation axis AX of the blade mounting plate 4 through the thickness center of the blade 5 of the blade mounting portion 5a. That is, it is on the downstream side, and is separated from the rotation axis AX of the blade attachment plate 4 in the radial direction by r, and away from the plane L perpendicular to the axis L in the axial direction of the rotation axis AX of the blade attachment plate 4.
  • a centrifugal force Fr acts on the blades 5 in parallel to the plane L perpendicular to the axis L as the rotation is performed.
  • the centrifugal force Fr applied to the blade 5 is a tensile component force Frt in the direction of the barycentric line K passing through the joint point P of the blade mounting portion 5a and the center of gravity G of the blade 5 and a bending component force Frb in the direction perpendicular to the barycentric line K Can be broken down into
  • the bending component Frb due to the centrifugal force Fr works in the upstream direction. That is, the bending component force Frb acts to cancel the force Fg due to its own weight, and the force for bending the blade 5 is weakened, and the stress generated in the blade 5 is reduced.
  • the centrifugal force Fr exerted on the blade 5 can be expressed as mr ⁇ 2.
  • the angle between the plane L and the center of gravity line K is ⁇
  • the bending component force Frb due to the centrifugal force can be expressed as mr ⁇ 2 ⁇ sin ⁇ .
  • the distance h in the axial direction of the rotation axis AX of the blade attachment plate 4 between the plane L perpendicular to the axis and the center of gravity G of the blade 5 can be expressed as sin ⁇ ⁇ h / r.
  • the bending force component Frb by centrifugal force considered to be proportional to the mh ⁇ 2. If ⁇ (h / r) ⁇ sin (h / r) ⁇ / sin (h / r) is about 0.01, it can be approximated as sin ⁇ ⁇ h / r. That is, if the angle ⁇ between the plane L and the center of gravity line K is 15 ° or less, it can be considered that an approximation of sin ⁇ ⁇ h / r holds.
  • the force for bending the blade 5 is minimized. That is, by determining the distance h in the axial direction of the rotation axis AX of the blade mounting plate 4 between the center of gravity G of the blade 5 and the plane L perpendicular to the axis so that the force Fg by its own weight balances with the bending component force Frb due to centrifugal force. The stress applied to the blades 5 can be reduced.
  • the force Fg by its own weight and the bending component Frb by centrifugal force are both forces acting on the blade 5 of mass m, and the gravitational acceleration is a constant, so the center of gravity G of the blade 5 and the plane L perpendicular to the axis L
  • the coefficient K can be obtained by analyzing the blade 5 by computer aided design, and takes a value of 2 or more and 3 or less.
  • the distance h between the center of gravity G of the blade 5 and the axis perpendicular surface L in the axial direction of the rotation axis AX of the blade mounting plate 4 is 2 ⁇ K ⁇ 3 and 1 / (K ⁇ N 2 ) ⁇ (g ⁇ ( By selecting so as to be 60 / 2 ⁇ ) 2 ), the stress generated in the blade 5 can be reduced.
  • FIG. 7 is a view showing the relationship between the number of revolutions of the ceiling fan according to the first embodiment and the distance between the center of gravity of the blade and the plane perpendicular to the axis in the axial direction of the rotation axis of the blade mounting plate.
  • the ceiling fan 100 is used in a rotation speed N in a range of 200 rotations per minute to 260 rotations per minute.
  • the distance h between the center of gravity G of the blade 5 and the axis-perpendicular surface L in the axial direction of the rotation axis AX of the blade mounting plate 4 is about 11 mm at 200 revolutions per minute and about 4 mm at 260 revolutions per minute.
  • the speed is 200 rotations per minute to 260 rotations per minute.
  • the stress generated in the blade 5 can be reduced.
  • the use rotation speed of the ceiling fan 100 is not limited to the illustrated range of 200 rotations per minute to 260 rotations per minute.
  • FIG. 8 is a side view of the rotary wing of the ceiling fan according to the first embodiment. Since the center of gravity G of the blade 5 is provided on the downstream side of the plane L, the distance b between the lower end 5l of the blade 5 which is the downstream end of the air flow generated by the blade 5 and the plane L is It is longer than the distance a between the upper end 5 h of the blade 5 which is the upstream end of the air flow generated by the air flow 5 and the plane L perpendicular to the axis L.
  • the distance h between the plane L perpendicular to the axis L and the lower end 5 l of the wing 5 in order to make the distance h in the axial direction of the rotation axis AX of the wing mounting plate 4 between the center G of the wing 5 and the plane L perpendicular to the axis b is 1.3 or more and 2.2 or less times the distance a between the plane L and the upper end 5 h of the blade 5.
  • the blade 5 is integrally formed with the blade mounting portion 5a and the blade and wing portion 5b.
  • the blade mounting portion 5a and the blade and wing portion 5b may be separate parts and fastened.
  • the ceiling fan 100 according to the first embodiment and the blades 5 used for the rotary wings 6 are additionally processed by setting the position of the center of gravity G so that the force Fg by its own weight and the bending component force Frb by centrifugal force are balanced. You can improve the strength without doing
  • the present invention is also applicable to the blades of an axial flow fan in which the rotation axis AX of the blade attachment plate 4 is installed along the vertical direction.
  • the configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A rotor blade (6) is provided with: a vane mounting plate (4) which is fixed to a shaft of a motor and rotates; and a vane (5) which is joined to the vane mounting plate (4) by means of a fastening member and rotates with the vane mounting plate (4) to form an air flow along the shaft. The vane (5) includes a vane mounting portion joined to the vane mounting plate (4) by means of the fastening member, and a vane blade portion for generating the air flow. The vane (5) has a center of gravity which, in an axial direction of an axis of rotation (AX) of the vane mounting plate (4), is positioned on the downstream side of an axis-perpendicular plane (L) which: passes the center point of a line segment connecting the center in the plate thickness of the vane (5) where the fastening member positioned frontmost in the rotating direction of the vane mounting plate (4) has the vane mounting portion fixed to the vane mounting plate (4) and the center in the plate thickness of the vane (5) where the fastening member positioned rearmost in the rotating direction has the vane mounting portion fixed to the vane mounting plate (4); and is orthogonal to the axis of rotation (AX) of the vane mounting plate (4).

Description

回転翼、軸流送風機及び天井扇Rotor, axial fan and ceiling fan

　本発明は、軸流送風機用の回転翼、回転翼とモータとを備える軸流送風機、及び天井に設置される天井扇に関する。 The present invention relates to an axial fan provided with a rotor for an axial fan, a rotor and a motor, and a ceiling fan installed on a ceiling.

　脱着可能な複数枚の羽根がモータの軸部に取り付けられた軸流送風機を、回転軸を鉛直方向に沿わせて天井に設置した天井扇において、羽根は、軸部に固定される根元部と、軸部が回転することにより空気を送風する翼部と、根元部と翼部を繋ぐ段差部とを有する。特許文献１には、羽根に窪みを設け、長期使用における繰り返し荷重に対する疲労強度を向上させた天井扇が開示されている。 In a ceiling fan provided with an axial flow fan in which a plurality of detachable blades are attached to the shaft of a motor, and the rotary shaft is vertically aligned along the vertical direction, the blades are rooted and fixed to the shaft And a wing portion for blowing air by rotation of the shaft portion, and a stepped portion connecting the root portion and the wing portion. Patent Document 1 discloses a ceiling fan in which a recess is provided in a blade to improve fatigue strength against repeated load in long-term use.

特開２０１４－１９０２９１号公報JP, 2014-190291, A

　しかしながら、上記特許文献１に開示される発明によれば、羽根の強度は向上させることができるが、羽根に窪みを設けるための追加加工が必要となり、製造時の工数が増加してしまう。 However, according to the invention disclosed in Patent Document 1, although the strength of the blade can be improved, additional processing for providing a recess in the blade is required, and the number of manufacturing steps increases.

　本発明は、上記に鑑みてなされたものであって、追加加工を行うことなく羽根の強度を向上させた軸流送風機用の回転翼を得ることを目的とする。 The present invention has been made in view of the above, and it is an object of the present invention to obtain a rotor for an axial flow fan in which the strength of the blades is improved without performing additional processing.

　上述した課題を解決し、目的を達成するために、本発明は、モータのシャフトに固定されて回転する羽根取付板と、羽根取付板に締結部材で接合され、羽根取付板とともに回転してシャフトに沿った気流を形成する羽根とを備える。羽根は、締結部材で羽根取付板に接合される羽根取付部と、気流を発生させる羽根翼部とを有する。羽根の重心は、羽根取付板の回転軸の軸方向において、羽根取付板の回転方向の最前方に位置する締結部材が羽根取付部を羽根取付板に固定している部分での羽根の板厚の中心と、回転方向の最後方に位置する締結部材が羽根取付部を羽根取付板に固定している部分での羽根の板厚の中心とを結ぶ線分の中点を通って羽根取付板の回転軸に直交する軸直角面よりも下流側に位置する。 In order to solve the problems described above and to achieve the object, the present invention is a blade mounting plate fixed to a shaft of a motor for rotation, and a fastening member joined to the blade mounting plate by a fastening member and rotating together with the blade mounting plate a shaft And an impeller for forming an air flow along the The blade has a blade mounting portion joined to a blade mounting plate by a fastening member, and a blade portion that generates an air flow. The center of gravity of the blade is the plate thickness of the blade at the portion where the fastening member positioned on the foremost side in the rotational direction of the blade mounting plate fixes the blade mounting portion to the blade mounting plate in the axial direction of the rotary shaft of the blade mounting plate. Through the middle of the line connecting the center of the blade and the center of the plate thickness of the blade at the portion where the fastening member located at the rear of the rotational direction fixes the blade mounting portion to the blade mounting plate Located on the downstream side of a plane perpendicular to the axis of rotation of

　本発明に係る回転翼は、追加加工を行うことなく羽根の強度を向上できるという効果を奏する。 The rotor according to the present invention has an effect that the strength of the blade can be improved without performing additional processing.

本発明の実施の形態１に係る天井扇の斜視図The perspective view of the ceiling fan which concerns on Embodiment 1 of this invention 実施の形態１に係る天井扇の回転翼の斜視図The perspective view of the rotary wing of the ceiling fan which concerns on Embodiment 1 実施の形態１に係る天井扇の回転翼の側面図Side view of the rotor fan of the ceiling fan according to the first embodiment 実施の形態１に係る天井扇の回転翼の正面図Front view of a rotary fan of a ceiling fan according to Embodiment 1 実施の形態１に係る天井扇の回転翼の正面図Front view of a rotary fan of a ceiling fan according to Embodiment 1 実施の形態１に係る天井扇の回転翼の模式図Schematic diagram of the rotor of the ceiling fan according to the first embodiment 実施の形態１に係る天井扇の回転数と、羽根の重心と軸直角面との羽根取付板の回転軸の軸方向における距離との関係を示す図The figure which shows the relationship between the rotation speed of the ceiling fan which concerns on Embodiment 1, and the distance in the axial direction of the rotating shaft of the blade | wing attachment plate of the gravity center of a blade | wing, and an axis right plane. 実施の形態１に係る天井扇の回転翼の側面図Side view of the rotor fan of the ceiling fan according to the first embodiment

　以下に、本発明の実施の形態に係る回転翼、軸流送風機及び天井扇を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, a rotor, an axial fan and a ceiling fan according to an embodiment of the present invention will be described in detail based on the drawings. The present invention is not limited by the embodiment.

実施の形態１．
　図１は、本発明の実施の形態１に係る天井扇の斜視図である。天井扇１００は、天井に取り付けられたフックに引っ掛けられる吊り下げ部１と、動力源であるモータ３と、吊り下げ部１とモータ３とを繋ぐパイプ２と、モータ３によって回転駆動される回転翼６とを備える。天井扇１００は、モータ３と回転翼６とを備えた軸流送風機であり、モータ３のシャフトを鉛直方向に沿わせて天井にモータ３が設置される。図２は、実施の形態１に係る天井扇の回転翼の斜視図である。図３は、実施の形態１に係る天井扇の回転翼の側面図である。回転翼６は、モータ３のシャフトに取り付けられて回転する羽根取付板４と、羽根取付板４に接合され、羽根取付板４の回転軸ＡＸを中心に放射状に延びる羽根５とを備える。羽根５は、羽根取付板４に固定される羽根取付部５ａと、気流を発生させる羽根翼部５ｂとを備える。羽根翼部５ｂは、モータ３のシャフトに垂直な平面に対して傾きを有する。羽根５は、羽根取付部５ａと羽根翼部５ｂとが一体成形されている。 Embodiment 1
FIG. 1 is a perspective view of a ceiling fan according to Embodiment 1 of the present invention. The ceiling fan 100 includes a suspending portion 1 hooked to a hook attached to the ceiling, a motor 3 as a power source, a pipe 2 connecting the suspending portion 1 and the motor 3, and a rotation driven by the motor 3 The wing 6 is provided. The ceiling fan 100 is an axial flow fan provided with the motor 3 and the rotary wings 6, and the motor 3 is installed on the ceiling with the shaft of the motor 3 along the vertical direction. FIG. 2 is a perspective view of the rotary wing of the ceiling fan according to the first embodiment. FIG. 3 is a side view of the rotary wing of the ceiling fan according to the first embodiment. The rotary wing 6 is provided with a blade mounting plate 4 which is attached to the shaft of the motor 3 and rotates, and a blade 5 joined to the blade mounting plate 4 and radially extending around a rotation axis AX of the blade mounting plate 4. The blade 5 includes a blade mounting portion 5 a fixed to the blade mounting plate 4 and a blade 5 b generating an air flow. The blade portion 5 b is inclined with respect to a plane perpendicular to the shaft of the motor 3. In the blade 5, the blade attachment portion 5a and the blade portion 5b are integrally formed.

　羽根取付部５ａは、締結部材７によって羽根取付板４に接合される。図４は、実施の形態１に係る天井扇の回転翼の正面図である。図４は、図３中に矢印ｖで示す方向から回転翼６を見た状態を示している。羽根取付部５ａは、二つの締結部材７で羽根取付板４に固定されている。ここで、回転方向の前方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心Ｃ１と、回転方向の後方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心Ｃ２とを結ぶ線分の中点Ｃ３を通って羽根取付板４の回転軸ＡＸに直交する面を軸直角面Ｌと定義する。図４は、二つの締結部材７で締結された場合であるが、三つ以上の締結部材７で締結された場合は、回転方向の最前方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心と、回転方向の最後方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心とを結ぶ線分の中点を通って羽根取付板４の回転軸ＡＸに直交する面を軸直角面Ｌと定義できる。 The blade attachment portion 5 a is joined to the blade attachment plate 4 by the fastening member 7. FIG. 4 is a front view of the rotary wing of the ceiling fan according to the first embodiment. FIG. 4 shows a state in which the rotary wing 6 is viewed from the direction shown by the arrow v in FIG. The blade mounting portion 5 a is fixed to the blade mounting plate 4 by two fastening members 7. Here, the center C1 of the plate thickness of the blade 5 at the portion where the fastening member 7 located forward in the rotational direction fixes the blade attachment portion 5a to the blade attachment plate 4 and the fastening member located rearward in the rotational direction 7 is perpendicular to the rotation axis AX of the blade mounting plate 4 through the midpoint C3 of the line connecting the blade mounting portion 5a to the blade thickness plate center C2 at the portion fixing the blade mounting portion 5a to the blade mounting plate 4 The plane is defined as the plane L perpendicular to the axis. FIG. 4 shows a case where two fastening members 7 are fastened, but in the case where three or more fastening members 7 are fastened, the fastening member 7 located at the forefront in the rotational direction has the blade attachment portion 5a as a blade The center of the plate thickness of the blade 5 at the portion fixed to the mounting plate 4 and the blade at the portion where the fastening member 7 located at the rear of the rotational direction fixes the blade mounting portion 5a to the blade mounting plate 4 A plane perpendicular to the rotation axis AX of the blade mounting plate 4 can be defined as an axis-perpendicular plane L through a midpoint of a line connecting the center of the plate thickness of 5 and the center of the plate thickness.

　図５は、実施の形態１に係る天井扇の回転翼の正面図である。羽根取付部５ａが回転軸ＡＸに対して傾きを有する場合も、回転方向の前方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心Ｃ１と、回転方向の後方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心Ｃ２とを結ぶ線分の中点Ｃ３を通って羽根取付板４の回転軸ＡＸに直交する面を軸直角面Ｌと定義できる。図５は、二つの締結部材７で締結された場合であるが、三つ以上の締結部材７で締結された場合は、回転方向の最前方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心と、回転方向の最後方に位置する締結部材７が羽根取付部５ａを羽根取付板４に固定している部分での羽根５の板厚の中心とを結ぶ線分の中点を通って羽根取付板４の回転軸ＡＸに直交する面を軸直角面Ｌと定義できる。 FIG. 5 is a front view of the rotary wing of the ceiling fan according to the first embodiment. Even when the blade mounting portion 5a is inclined with respect to the rotation axis AX, the plate thickness of the blade 5 at the portion where the fastening member 7 located forward in the rotational direction fixes the blade mounting portion 5a to the blade mounting plate 4 Middle point C3 of a line connecting the center C1 of the blade and the center C2 of the plate thickness of the blade 5 at the portion where the fastening member 7 located at the rear in the rotational direction fixes the blade mounting portion 5a to the blade mounting plate 4 A plane perpendicular to the rotation axis AX of the blade mounting plate 4 can be defined as an axis perpendicular plane L. FIG. 5 shows a case where two fastening members 7 are fastened, but in the case where three or more fastening members 7 are fastened, the fastening member 7 located at the forefront in the rotational direction has the blade attachment portion 5a as a blade The center of the plate thickness of the blade 5 at the portion fixed to the mounting plate 4 and the blade at the portion where the fastening member 7 located at the rear of the rotational direction fixes the blade mounting portion 5a to the blade mounting plate 4 A plane perpendicular to the rotation axis AX of the blade mounting plate 4 can be defined as an axis-perpendicular plane L through a midpoint of a line connecting the center of the plate thickness of 5 and the center of the plate thickness.

　天井扇１００は、モータ３が回転することにより、シャフトとともに回転翼６が回転する。羽根翼部５ｂは、モータ３のシャフトに垂直な平面に対して傾きを有するため、回転翼６が回転することにより、図１中に矢印Ａで示す方向に気流が発生する。 In the ceiling fan 100, when the motor 3 rotates, the rotary wings 6 rotate with the shaft. Since the blade portion 5b is inclined with respect to a plane perpendicular to the shaft of the motor 3, the rotation of the rotary blade 6 generates an air flow in the direction indicated by the arrow A in FIG.

　図１に示す天井扇１００は、羽根５を五枚備えるが、羽根５は二枚以上であればよく、五枚に限定はされない。なお、天井扇１００の五枚の羽根５は同一形状である。 The ceiling fan 100 shown in FIG. 1 includes five blades 5, but the number of the blades 5 may be two or more, and is not limited to five. The five blades 5 of the ceiling fan 100 have the same shape.

　図６は、実施の形態１に係る天井扇の回転翼の模式図である。羽根５の重心Ｇは、羽根５一枚の重心位置であり、羽根取付部５ａの羽根５の板厚中心を通って羽根取付板４の回転軸ＡＸに直交する軸直角面Ｌよりも下、すなわち下流側にあり、羽根取付板４の回転軸ＡＸから半径方向にｒ、軸直角面Ｌから羽根取付板４の回転軸ＡＸの軸方向にｈ離れている。 FIG. 6 is a schematic view of a rotary wing of a ceiling fan according to the first embodiment. The center of gravity G of the blade 5 is the position of the center of gravity of one blade 5 and is lower than the plane L perpendicular to the rotation axis AX of the blade mounting plate 4 through the thickness center of the blade 5 of the blade mounting portion 5a. That is, it is on the downstream side, and is separated from the rotation axis AX of the blade attachment plate 4 in the radial direction by r, and away from the plane L perpendicular to the axis L in the axial direction of the rotation axis AX of the blade attachment plate 4.

　図６に示すように、羽根５の質量をｍ、重力加速度をｇとすると、羽根５の重心Ｇに自重による力Ｆｇ＝ｍｇが重力方向、すなわち気流の下流側に加わり、羽根５を下流側に曲げる。 As shown in FIG. 6, assuming that the mass of the blade 5 is m and the gravitational acceleration is g, a force Fg = mg due to its own weight is applied to the center of gravity G of the blade 5 in the gravity direction, that is, the downstream side of the air flow. Bend in

　また、羽根５には、回転にともなって軸直角面Ｌに平行に遠心力Ｆｒが働く。羽根５に加わる遠心力Ｆｒは、羽根取付部５ａの接合点Ｐと羽根５の重心Ｇとを通る重心線Ｋの方向の引っ張り分力Ｆｒｔと、重心線Ｋに垂直方向の曲げ分力Ｆｒｂとに分解できる。 In addition, a centrifugal force Fr acts on the blades 5 in parallel to the plane L perpendicular to the axis L as the rotation is performed. The centrifugal force Fr applied to the blade 5 is a tensile component force Frt in the direction of the barycentric line K passing through the joint point P of the blade mounting portion 5a and the center of gravity G of the blade 5 and a bending component force Frb in the direction perpendicular to the barycentric line K Can be broken down into

　羽根５の重心Ｇを軸直角面Ｌよりも下流側にすることで、遠心力Ｆｒによる曲げ分力Ｆｒｂは、上流側の向きに働く。すなわち、曲げ分力Ｆｒｂが、自重による力Ｆｇを打ち消すように働き、羽根５を折り曲げる力が弱まり、羽根５に発生する応力が小さくなる。 By setting the center of gravity G of the blade 5 downstream of the plane L, the bending component Frb due to the centrifugal force Fr works in the upstream direction. That is, the bending component force Frb acts to cancel the force Fg due to its own weight, and the force for bending the blade 5 is weakened, and the stress generated in the blade 5 is reduced.

　ここで、羽根取付板４の回転軸ＡＸから羽根５の重心Ｇまでの半径方向の距離をｒ、角速度をωとすると、羽根５にかかる遠心力Ｆｒは、ｍｒω２と表せる。軸直角面Ｌと重心線Ｋとのなす角度をθとすると、遠心力による曲げ分力Ｆｒｂはｍｒω２×ｓｉｎθと表せる。一方、軸直角面Ｌと羽根５の重心Ｇとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈは、ｓｉｎθ≒ｈ／ｒと表せる。これより、遠心力による曲げ分力Ｆｒｂは、ｍｈω２と比例関係にあるとみなせる。なお、｛（ｈ／ｒ）－ｓｉｎ（ｈ／ｒ）｝／ｓｉｎ（ｈ／ｒ）が０．０１程度であれば、ｓｉｎθ≒ｈ／ｒと近似できるとする。すなわち、軸直角面Ｌと重心線Ｋとのなす角度θが１５°以下であれば、ｓｉｎθ≒ｈ／ｒの近似が成り立つと見なせる。 Here, when the radial distance from the axis of rotation AX of the blade mounting plate 4 to the center of gravity G of the blade 5 r, and the angular velocity omega, the centrifugal force Fr exerted on the blade 5 can be expressed as mrω 2. Assuming that the angle between the plane L and the center of gravity line K is θ, the bending component force Frb due to the centrifugal force can be expressed as mrω 2 × sinθ. On the other hand, the distance h in the axial direction of the rotation axis AX of the blade attachment plate 4 between the plane L perpendicular to the axis and the center of gravity G of the blade 5 can be expressed as sin θ ≒ h / r. From this, the bending force component Frb by centrifugal force, considered to be proportional to the mhω 2. If {(h / r) −sin (h / r)} / sin (h / r) is about 0.01, it can be approximated as sin θ ≒ h / r. That is, if the angle θ between the plane L and the center of gravity line K is 15 ° or less, it can be considered that an approximation of sin θ ≒ h / r holds.

　自重による力Ｆｇと、遠心力による曲げ分力Ｆｒｂとが釣り合うとき、羽根５を曲げる力が最も小さくなる。すなわち、自重による力Ｆｇと、遠心力による曲げ分力Ｆｒｂとが釣り合うように羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈを決めることで、羽根５にかかる応力を小さくできる。 When the force Fg due to the own weight and the bending component Frb due to the centrifugal force are balanced, the force for bending the blade 5 is minimized. That is, by determining the distance h in the axial direction of the rotation axis AX of the blade mounting plate 4 between the center of gravity G of the blade 5 and the plane L perpendicular to the axis so that the force Fg by its own weight balances with the bending component force Frb due to centrifugal force. The stress applied to the blades 5 can be reduced.

　自重による力Ｆｇと、遠心力による曲げ分力Ｆｒｂとは、どちらも質量ｍの羽根５に作用する力であり、重力加速度は定数であるため、羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈは、角速度に比例する。また、回転数をＮ回転毎分とすると、Ｎ＝ω×（６０／２π）と表せるため、羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈは、回転数Ｎに基づいて決定できる。羽根５の形状及び構造に基づいて定まる係数をＫとすると、羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈと、天井扇１００の回転数Ｎとは、ｈ＝１／（Ｋ×Ｎ２）×（ｇ×（６０／２π）２）と表すことができる。なお、係数Ｋは、羽根５をコンピュータ支援設計によって解析することによって求めることができ、２以上３以下の値をとる。 The force Fg by its own weight and the bending component Frb by centrifugal force are both forces acting on the blade 5 of mass m, and the gravitational acceleration is a constant, so the center of gravity G of the blade 5 and the plane L perpendicular to the axis L The distance h in the axial direction of the rotation axis AX of the blade mounting plate 4 is proportional to the angular velocity. Further, assuming that the number of rotations is N rotations per minute, N = ω × (60 / 2π), so the distance between the center G of the blade 5 and the plane L perpendicular to the axis of the rotation axis AX of the blade mounting plate 4 h can be determined based on the number of revolutions N. Assuming that the coefficient determined based on the shape and structure of the blade 5 is K, the distance h between the center G of the blade 5 and the plane L perpendicular to the blade mounting plate 4 in the axial direction of the rotation axis AX and the number of rotations of the ceiling fan 100 N can be expressed as h = 1 / (K × N 2 ) × (g × (60 / 2π) 2 ). The coefficient K can be obtained by analyzing the blade 5 by computer aided design, and takes a value of 2 or more and 3 or less.

　すなわち、羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈを、２≦Ｋ≦３、かつ１／（Ｋ×Ｎ２）×（ｇ×（６０／２π）２）となるように選べば、羽根５に発生する応力を小さくすることができる。 That is, the distance h between the center of gravity G of the blade 5 and the axis perpendicular surface L in the axial direction of the rotation axis AX of the blade mounting plate 4 is 2 ≦ K ≦ 3 and 1 / (K × N 2 ) × (g × ( By selecting so as to be 60 / 2π) 2 ), the stress generated in the blade 5 can be reduced.

　図７は、実施の形態１に係る天井扇の回転数と、羽根の重心と軸直角面との羽根取付板の回転軸の軸方向における距離との関係を示す図である。ここで、天井扇１００は、回転数Ｎが毎分２００回転から毎分２６０回転の範囲で使用されるものとする。羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈは、毎分２００回転では１１ｍｍ、毎分２６０回転では４ｍｍ程度である。すなわち、羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈを、４ｍｍ以上１１ｍｍ以下とすれば、毎分２００回転から毎分２６０回転の範囲で使用した場合に、羽根５に発生する応力を小さくすることができる。なお、天井扇１００の使用回転数は、例示した毎分２００回転から毎分２６０回転の範囲に限定はされない。 FIG. 7 is a view showing the relationship between the number of revolutions of the ceiling fan according to the first embodiment and the distance between the center of gravity of the blade and the plane perpendicular to the axis in the axial direction of the rotation axis of the blade mounting plate. Here, it is assumed that the ceiling fan 100 is used in a rotation speed N in a range of 200 rotations per minute to 260 rotations per minute. The distance h between the center of gravity G of the blade 5 and the axis-perpendicular surface L in the axial direction of the rotation axis AX of the blade mounting plate 4 is about 11 mm at 200 revolutions per minute and about 4 mm at 260 revolutions per minute. That is, if the distance h between the center of gravity G of the blade 5 and the axis perpendicular surface L in the axial direction of the rotation axis AX of the blade mounting plate 4 is 4 mm or more and 11 mm or less, the speed is 200 rotations per minute to 260 rotations per minute. When used, the stress generated in the blade 5 can be reduced. In addition, the use rotation speed of the ceiling fan 100 is not limited to the illustrated range of 200 rotations per minute to 260 rotations per minute.

　図８は、実施の形態１に係る天井扇の回転翼の側面図である。羽根５の重心Ｇは、軸直角面Ｌよりも下流側に設けるため、羽根５が発生させる気流の下流側となる端である羽根５の下端５ｌと軸直角面Ｌとの距離ｂは、羽根５が発生させる気流の上流側となる端である羽根５の上端５ｈと軸直角面Ｌとの距離ａよりも長い。羽根５の重心Ｇと軸直角面Ｌとの羽根取付板４の回転軸ＡＸの軸方向における距離ｈを４ｍｍから１１ｍｍの範囲とするために、軸直角面Ｌと羽根５の下端５ｌとの距離ｂは、軸直角面Ｌと羽根５の上端５ｈとの距離ａの１．３倍以上２．２倍以下とされている。 FIG. 8 is a side view of the rotary wing of the ceiling fan according to the first embodiment. Since the center of gravity G of the blade 5 is provided on the downstream side of the plane L, the distance b between the lower end 5l of the blade 5 which is the downstream end of the air flow generated by the blade 5 and the plane L is It is longer than the distance a between the upper end 5 h of the blade 5 which is the upstream end of the air flow generated by the air flow 5 and the plane L perpendicular to the axis L. The distance h between the plane L perpendicular to the axis L and the lower end 5 l of the wing 5 in order to make the distance h in the axial direction of the rotation axis AX of the wing mounting plate 4 between the center G of the wing 5 and the plane L perpendicular to the axis b is 1.3 or more and 2.2 or less times the distance a between the plane L and the upper end 5 h of the blade 5.

　上記の説明において、羽根５は、羽根取付部５ａと羽根翼部５ｂとが一体成形されていたが、羽根取付部５ａと羽根翼部５ｂとを別部品とし、締結してもよい。板厚が厚い羽根取付部５ａと板厚が薄い羽根翼部５ｂとを締結して羽根５を形成することにより、羽根５に働く自重による力Ｆｇを小さくできるため、発生する応力が小さく、軽量かつ低コストな羽根５を容易に得られる。 In the above description, the blade 5 is integrally formed with the blade mounting portion 5a and the blade and wing portion 5b. However, the blade mounting portion 5a and the blade and wing portion 5b may be separate parts and fastened. By forming the blade 5 by fastening the blade mounting portion 5a having a large thickness and the blade wing portion 5b having a small thickness to form the blade 5, the force Fg due to its own weight acting on the blade 5 can be reduced. And a low cost blade 5 can be easily obtained.

　実施の形態１に係る天井扇１００及び回転翼６に用いられる羽根５は、自重による力Ｆｇと、遠心力による曲げ分力Ｆｒｂとが釣り合うように重心Ｇの位置を設定することにより、追加加工を行うことなくの強度を向上できる。 The ceiling fan 100 according to the first embodiment and the blades 5 used for the rotary wings 6 are additionally processed by setting the position of the center of gravity G so that the force Fg by its own weight and the bending component force Frb by centrifugal force are balanced. You can improve the strength without doing

　なお、上記の実施の形態１では、天井扇について説明したが、羽根取付板４の回転軸ＡＸが鉛直方向に沿って設置される軸流送風機の羽根にも本発明を適用可能である。 Although the ceiling fan has been described in the first embodiment, the present invention is also applicable to the blades of an axial flow fan in which the rotation axis AX of the blade attachment plate 4 is installed along the vertical direction.

　以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and one of the configurations is possible within the scope of the present invention. Parts can be omitted or changed.

　１　吊り下げ部、２　パイプ、３　モータ、４　羽根取付板、５　羽根、５ａ　羽根取付部、５ｂ　羽根翼部、５ｈ　上端、５ｌ　下端、６　回転翼、７　締結部材、１００　天井扇、ＡＸ　回転軸、Ｇ　重心、Ｋ　重心線、Ｌ　軸直角面。 DESCRIPTION OF SYMBOLS 1 Suspension part, 2 pipe, 3 motor, 4 blade attachment plate, 5 blade, 5a blade attachment part, 5b blade wing part, 5h upper end, 5l lower end, 6 rotary wing, 7 fastening member, 100 ceiling fan, AX rotary shaft , G center of gravity, K center of gravity line, L axis perpendicular plane.

Claims (7)

　モータのシャフトに固定されて回転する羽根取付板と、該羽根取付板に締結部材で接合され、前記羽根取付板とともに回転して前記シャフトに沿った気流を形成する羽根とを備え、
　前記羽根は、前記締結部材で前記羽根取付板に接合される羽根取付部と、前記気流を発生させる羽根翼部とを有し、
　前記羽根の重心は、前記羽根取付板の回転軸の軸方向において、前記羽根取付板の回転方向の最前方に位置する前記締結部材が前記羽根取付部を前記羽根取付板に固定している部分での前記羽根の板厚の中心と、回転方向の最後方に位置する前記締結部材が前記羽根取付部を前記羽根取付板に固定している部分での前記羽根の板厚の中心とを結ぶ線分の中点を通って前記羽根取付板の回転軸に直交する軸直角面よりも下流側に位置することを特徴とする回転翼。 The apparatus comprises: a blade mounting plate fixed to a motor shaft and rotating; and a blade joined to the blade mounting plate by a fastening member and rotating with the blade mounting plate to form an air flow along the shaft.
The blade includes a blade mounting portion joined to the blade mounting plate by the fastening member, and a blade portion generating the air flow.
The center of gravity of the blade is a portion where the fastening member positioned on the foremost side in the rotational direction of the blade mounting plate in the axial direction of the rotating shaft of the blade mounting plate fixes the blade mounting portion to the blade mounting plate Between the center of the plate thickness of the blade and the center of the plate thickness of the blade at the portion where the fastening member located at the rear of the rotational direction fixes the blade mounting portion to the blade mounting plate A rotary blade, which is positioned downstream of a plane perpendicular to the axis of rotation of the blade attachment plate through a middle point of the line segment. 　前記羽根の重心と前記軸直角面との前記羽根取付板の回転軸の軸方向における距離は、４ｍｍ以上１１ｍｍ以下であることを特徴とする請求項１に記載の回転翼。 The rotary blade according to claim 1, wherein the distance between the center of gravity of the blade and the axis perpendicular to the axial direction of the blade mounting plate in the axial direction is 4 mm or more and 11 mm or less. 　前記気流の下流側となる前記羽根の端と前記軸直角面との距離は、前記気流の上流側となる前記羽根の端と前記軸直角面との距離よりも長いことを特徴とする請求項１に記載の回転翼。 The distance between the end of the blade on the downstream side of the air flow and the plane perpendicular to the axis is longer than the distance between the end of the blade on the upstream side of the air flow and the plane perpendicular to the axis. The rotor according to 1. 　前記気流の下流側となる前記羽根の端と前記軸直角面との距離は、前記気流の上流側となる前記羽根の端と前記軸直角面との距離の１．３倍以上２．２倍以下であることを特徴とする請求項１に記載の回転翼。 The distance between the end of the blade on the downstream side of the air flow and the plane perpendicular to the axis is 1.3 to 2.2 times the distance between the end of the blade on the upstream side of the air flow and the plane perpendicular to the axis The rotor according to claim 1, characterized in that: 　請求項１から４のいずれか１項に記載の回転翼と前記モータとを備えることを特徴とする軸流送風機。 An axial flow fan comprising the rotor according to any one of claims 1 to 4 and the motor. 　前記軸直角面と前記羽根の重心との前記羽根取付板の回転軸の軸方向における距離をｈ、前記羽根取付板の回転数をＮ、前記羽根の形状及び構造に基づいて定まる係数をＫとするとき、ｈ＝１／（Ｋ×Ｎ２）×（ｇ×（６０／２π）２）を満たし、前記係数Ｋは、２以上３以下であることを特徴とする請求項５に記載の軸流送風機。 The distance between the plane perpendicular to the axis and the center of gravity of the blade in the axial direction of the axis of rotation of the blade mounting plate is h, the number of rotations of the blade mounting plate is N, and the coefficient determined based on the shape and structure of the blade is K 6. The shaft according to claim 5, wherein h = 1 / (K × N 2 ) × (g × (60 / 2π) 2 ) is satisfied, and the coefficient K is 2 or more and 3 or less. Flow blower. 　請求項５又は６に記載の軸流送風機を用いた天井扇であって、
　前記羽根取付板の回転軸を鉛直方向に沿わせて天井に設置されることを特徴とする天井扇。 It is a ceiling fan using the axial flow fan according to claim 5 or 6,
A ceiling fan which is installed on a ceiling with the rotation axis of the blade attachment plate along the vertical direction.
PCT/JP2017/046753 2017-12-26 2017-12-26 Rotor blade, axial-flow blower, and ceiling fan Ceased WO2019130441A1 (en)

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MYPI2020003201A MY184176A (en) 2017-12-26 2017-12-26 Rotor blade, axial-flow blower, and ceiling fan
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