JPH109192A - Rotor blade for axial blower - Google Patents

Rotor blade for axial blower

Info

Publication number
JPH109192A
JPH109192A JP16586496A JP16586496A JPH109192A JP H109192 A JPH109192 A JP H109192A JP 16586496 A JP16586496 A JP 16586496A JP 16586496 A JP16586496 A JP 16586496A JP H109192 A JPH109192 A JP H109192A
Authority
JP
Japan
Prior art keywords
shelf
blade
disk
blade body
axial blower
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.)
Pending
Application number
JP16586496A
Other languages
Japanese (ja)
Inventor
Yukimasa Okada
幸正 岡田
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 Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP16586496A priority Critical patent/JPH109192A/en
Publication of JPH109192A publication Critical patent/JPH109192A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent fretting cracks in the stepped part of a blade body part in an axial blower by filling the space between the stepped part, which is inserted into the shelf part of a disc and fastened thereto with a nut, and the shelf part with material of a smaller hardness to avoid the contact of the stepped part with the shelf part. SOLUTION: A rotor blade of an axial blower is fastened at its blade body part 8 to a shelf part 7 of a disc with its screw part 5 and a nut 6. In order to avoid the contact of a stepped part 4 of the rotor blade in which fretting cracks are liable to occur with the shelf part 7, which both parts are made of metal, the space between the stepped part 4 and the shelf part 7 is filled with material 1 of a smaller hardness such as resin and hard rubber. The contact of the stepped part 4 with the soft material 1 prevents fretting cracks from occurring therein. The relative sliding motion of the material 1 and the stepped part 4 to each other increases the structural damping to thereby reduce the vibrational stress of the blade body part 8.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、送風などに適用さ
れる軸流送風機に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial blower used for blowing air and the like.

【0002】[0002]

【従来の技術】図4は送風などに使用されている従来の
軸流送風機の動翼の説明図である。図において、軸流送
風機の動翼は翼身部8の段差部4がディスク9の棚部7
に挿入され、ねじ部5とナット6とを使用して翼身部8
がディスク9に固定されている。図における符号2は翼
身部8のプラットフォーム、10は軸流送風機の回転軸
である。
2. Description of the Related Art FIG. 4 is an explanatory view of a moving blade of a conventional axial flow blower used for blowing air or the like. In the figure, the rotor 4 of the axial blower has a step portion 4 of a blade body 8 and a shelf 7 of a disk 9.
And a wing body 8 using a screw 5 and a nut 6.
Are fixed to the disk 9. Reference numeral 2 in the figure denotes a platform of the blade body 8, and reference numeral 10 denotes a rotation axis of the axial blower.

【0003】[0003]

【発明が解決しようとする課題】上記のように、従来の
軸流送風機の動翼においては翼身部8の段差部4がディ
スク9の棚部7に挿入され、ねじ部5とナット6とを使
用して翼身部8がディスク9に固定されているが、軸流
送風機の回転時に遠心力により翼身部8が浮き上がり、
段差部4が棚部7と接触してフレッティング亀裂を発生
することがある。このフレッティング亀裂が発生すると
翼材の強度が急激に低下して微小な振動応力でも亀裂が
伝播し、最終的には動翼の飛散事故を招く場合がある。
As described above, in the moving blade of the conventional axial blower, the stepped portion 4 of the blade body 8 is inserted into the shelf 7 of the disk 9, and the screw portion 5, the nut 6 and The wing body 8 is fixed to the disk 9 by using, but the wing body 8 rises due to centrifugal force when the axial blower rotates,
The step portion 4 may come into contact with the shelf portion 7 to cause fretting cracks. When the fretting crack occurs, the strength of the blade material rapidly decreases, and the crack propagates even with a small vibration stress, which may eventually lead to a flying blade scattering accident.

【0004】[0004]

【課題を解決するための手段】本発明に係る軸流送風機
の動翼は上記課題の解決を目的にしており、翼身部の段
差部がディスクの棚部に挿入されナットにより締結され
て上記翼身部が上記ディスクに固定される軸流送風機の
動翼における上記段差部と上記棚部との間に硬度の低い
物質が充填されている。このように翼身部の段差部とデ
ィスクの棚部との間に硬度の低い物質を充填することに
より段差部が棚部と接触せず、段差部のフレッティング
亀裂が防止される。また、硬度の低い物質と段差部との
相対的な滑りにより構造減衰が増加する。
SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor blade for an axial blower, in which a stepped portion of a blade body is inserted into a shelf of a disk and fastened by a nut. A material having low hardness is filled between the step portion and the shelf portion in the rotor blade of the axial blower whose blade body is fixed to the disk. In this way, by filling the low-hardness material between the step portion of the blade body portion and the shelf of the disk, the step portion does not come into contact with the shelf portion, and fretting cracks in the step portion are prevented. In addition, relative damping between the low hardness material and the step portion increases structural damping.

【0005】また、本発明に係る軸流送風機の動翼は、
翼身部の段差部がディスクの棚部に挿入されナットによ
り締結されて上記翼身部が上記ディスクに固定される軸
流送風機の動翼における上記翼身部のプラットフォーム
と上記棚部とを密接に係合させるとともに上記段差部と
上記棚部との間に互いの接触を抑止する十分な隙間を設
けている。このように翼身部のプラットフォームとディ
スクの棚部とを密着させるとともに翼身部の段差部とデ
ィスクの棚部との間に十分な隙間を設けることにより段
差部が棚部と接触せず、段差部のフレッティング亀裂が
防止される。また、段差部よりも大径のプラットフォー
ムをディスクの棚部と密着させることにより翼身部の振
動応力を大幅に低減させることができる。
[0005] Further, the moving blade of the axial blower according to the present invention comprises:
The step portion of the blade body is inserted into the shelf of the disk and fastened by a nut, and the platform of the blade body in the moving blade of the axial blower in which the blade body is fixed to the disk is closely attached to the shelf. And a sufficient gap is provided between the step portion and the shelf to suppress mutual contact. In this way, the platform of the blade body portion and the disk shelf are brought into close contact with each other, and by providing a sufficient gap between the step portion of the blade body portion and the disk shelf, the step does not contact the shelf, Fretting cracks at the steps are prevented. Further, by bringing a platform having a diameter larger than that of the step portion into close contact with the shelf of the disk, the vibration stress of the blade body can be significantly reduced.

【0006】[0006]

【発明の実施の形態】図1乃至図3はそれぞれ本発明の
実施の第一乃至第三の形態に係る軸流送風機の動翼の説
明図である。図において、これら実施の形態に係る軸流
送風機の動翼は送風などに使用される軸流送風機の動翼
で、図に示すように翼身部8がねじ部5とナット6とを
使用してディスクの棚部7に固定されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 are explanatory views of a moving blade of an axial blower according to first to third embodiments of the present invention, respectively. In the drawings, the blades of the axial blower according to these embodiments are blades of an axial blower used for air blowing and the like, and a blade body 8 uses a screw portion 5 and a nut 6 as shown in the drawing. To the shelf 7 of the disk.

【0007】図1において、第一の実施の形態に係る軸
流送風機の動翼はフレッティング亀裂が発生する可能性
がある段差部4とディスクの棚部7との金属同士の接触
を避けるために図に示すように段差部4と棚部7との間
に樹脂、硬質ゴムなど硬度の低い物質1が充填されてい
る。このように、段差部4と棚部7との間に樹脂、硬質
ゴムなど硬度の低い物質1を充填して段差部4をこれら
の柔い物質1と接触させることにより、フレッティング
亀裂の発生を防止している。この場合、物質1と段差部
4との相対的な滑りによって構造減衰が増加することに
より、翼身部8の振動応力を低減させることができる。
In FIG. 1, the blades of the axial blower according to the first embodiment are used to avoid metal-to-metal contact between the step portion 4 and the disk shelf 7 where fretting cracks may occur. As shown in the figure, a low-hardness substance 1 such as resin or hard rubber is filled between the step portion 4 and the shelf portion 7. As described above, the space between the step portion 4 and the shelf portion 7 is filled with the low-hardness material 1 such as resin or hard rubber, and the step portion 4 is brought into contact with these soft materials 1 to generate fretting cracks. Has been prevented. In this case, since the structural damping increases due to the relative slip between the substance 1 and the step portion 4, the vibration stress of the blade body portion 8 can be reduced.

【0008】図2において、第二の実施の形態に係る軸
流送風機の動翼は図に示すようにフレッティング亀裂が
発生する可能性がある翼身部8の段差部4とディスクの
棚部7との間の隙間L2 を、翼身部8のプラットフォー
ム2とディスクの棚部7との隙間L1 よりも十分に大き
くL2 >L1 とし、翼身部8が振動してもプラットフォ
ーム2がディスクの棚部7と接触することにより段差部
4は棚部7と接触しないようにようにし、フレッティン
グ亀裂の発生を防止している。
In FIG. 2, the blade of the axial flow blower according to the second embodiment has a stepped portion 4 of a blade body 8 and a disk shelf which may cause fretting cracks, as shown in FIG. a gap L 2 between the 7, sufficiently large and L 2> L 1 than the gap L 1 between the platform 2 and the shelf portion 7 of the disc Tsubasami portion 8, platforms oscillate Tsubasami portion 8 When the disc 2 comes into contact with the shelf 7 of the disc, the step 4 does not come into contact with the shelf 7, thereby preventing the occurrence of fretting cracks.

【0009】図3において、第三の実施の形態に係る軸
流送風機の動翼は図に示すように翼身部8のプラットフ
ォーム2とディスクの棚部7とが接触する部分に互いに
ねじを刻設してプラットフォーム2と棚部7とを噛み合
わせ螺合することにより段差部4は棚部7と接触しない
ようにし、フレッティング亀裂の発生を防止している。
このように、第二、第三の実施の形態に係る軸流送風機
の動翼においては、段差部4よりも直径の大きいプラッ
トフォーム2をディスクの棚部7と接触させることによ
り、翼身部8の振動応力を大幅に低減させている。即
ち、接触部における直径をdとすると断面定数Zは直径
dの3乗で増加し、Z=π・d3 /32となる。振動応
力σはそこに働くモーメントをMとするとσ=M/Zの
関係からσ=32M/πd3 となり、振動応力σを大幅
に低減させることができる。
Referring to FIG. 3, the blades of the axial blower according to the third embodiment are mutually threaded at the portion where the platform 2 of the blade body 8 and the disk shelf 7 are in contact with each other as shown in the figure. The stepped portion 4 is prevented from contacting the shelf portion 7 by engaging the platform 2 and the shelf portion 7 and screwing them together, thereby preventing generation of fretting cracks.
As described above, in the rotor blades of the axial blower according to the second and third embodiments, the platform 2 having a larger diameter than the step portion 4 is brought into contact with the shelf 7 of the disk, whereby the blade body portion 8 is formed. Vibration stress is greatly reduced. That is, cross-sectional constant Z When the diameter is d at the contact portion increases with the cube of the diameter d, the Z = π · d 3/32 . Assuming that the moment acting on the vibration stress σ is M, σ = 32M / πd 3 from the relation of σ = M / Z, and the vibration stress σ can be greatly reduced.

【0010】従来の軸流送風機の動翼においては翼身部
の段差部がディスクの棚部に挿入され、ねじ部とナット
とを使用して翼身部がディスクに固定されているが、軸
流送風機の回転時に遠心力により翼身部が浮き上がり、
段差部が棚部と接触してフレッティング亀裂を発生する
ことがある。このフレッティング亀裂が発生すると翼材
の強度が急激に低下して微小な振動応力でも亀裂が伝播
し、最終的には動翼の飛散事故を招く場合があるが、上
述の各実施の形態に係る軸流送風機の動翼においては図
1に示すように段差部4とディスクの棚部7との間に樹
脂、硬質ゴムなど硬度の低い物質1を充填する、或いは
図2に示すように翼身部8の段差部4とディスクの棚部
7との間の隙間を、プラットフォーム2とディスクの棚
部7との隙間よりも十分に大きくする、或いは図3に示
すように翼身部8のプラットフォーム2とディスクの棚
部7とが接触する部分に互いにねじを切って翼身部8の
段差部4よりも直径の大きいプラットフォーム2と棚部
7とを噛み合わせるなどしており、段差部4と棚部7と
の間に樹脂、硬質ゴムなど硬度の低い物質1を充填して
段差部4を柔い物質1と接触させることにより、フレッ
ティング亀裂の発生を防止することができるとともに、
充填した物質1と段差部4との相対的な滑りにより構造
減衰が増加する。また、振動応力は直径の3乗に逆比例
するため、段差部4よりも直径の大きいプラットフォー
ム2をディスクの棚部7と接触させることにより、翼身
部8の振動応力を大幅に低減させることができる。この
ように、物質1や隙間L2 などによるフレッティング亀
裂の防止、或いは翼身部8がディスクの棚部7と接触す
る部分の直径を拡大することにより翼身部8の振動応力
を大幅に低減させることなどが可能になって軸流送風機
における動翼の飛散事故などがなくなる。
In a conventional blade of an axial flow blower, a step portion of a blade body is inserted into a shelf of a disk, and the blade body is fixed to the disk using screws and nuts. At the time of the rotation of the blower, the wing body part rises due to centrifugal force,
The step may come into contact with the shelf to cause fretting cracks. When this fretting crack occurs, the strength of the wing material decreases rapidly and the crack propagates even with minute vibration stress, which may eventually cause a flying blade scattering accident. In the rotor of such an axial blower, a material 1 having a low hardness such as resin or hard rubber is filled between a step portion 4 and a disk shelf 7 as shown in FIG. 1 or a blade as shown in FIG. The gap between the step 4 of the body 8 and the shelf 7 of the disk is made sufficiently larger than the gap between the platform 2 and the shelf 7 of the disk, or as shown in FIG. The portion where the platform 2 and the disk shelf 7 contact each other is threaded with each other to engage the platform 2 having a larger diameter than the step 4 of the wing body 8 with the shelf 7, and the like. Hardness such as resin and hard rubber between By contacting the stepped portion 4 and Yawarai material 1 filled with low material 1, it is possible to prevent the occurrence of fretting cracking,
The relative slip between the filled substance 1 and the step 4 increases the structural damping. Further, since the vibration stress is inversely proportional to the cube of the diameter, the vibration stress of the blade body 8 can be greatly reduced by bringing the platform 2 having a larger diameter than the step portion 4 into contact with the disk shelf 7. Can be. As described above, the vibration stress of the wing 8 is greatly reduced by preventing the fretting crack due to the substance 1 or the gap L 2 or by increasing the diameter of the portion where the wing 8 contacts the disk shelf 7. It is possible to reduce the number of rotor blades, thereby eliminating the occurrence of a flying blade accident in an axial blower.

【0011】[0011]

【発明の効果】本発明に係る軸流送風機は前記のように
構成されており、段差部が棚部と接触せず、翼身部のフ
レッティング亀裂が防止されるので、動翼が飛散するな
どの事故が発生しなくなる。
The axial blower according to the present invention is constructed as described above, and the stepped portion does not come into contact with the shelf and fretting cracks in the blade body portion are prevented, so that the moving blades scatter. Accidents such as will not occur.

【図面の簡単な説明】[Brief description of the drawings]

【図1】図1(a)は本発明の実施の第一の形態に係る
軸流送風機の動翼の断面図、同図(b)は平面図であ
る。
FIG. 1A is a cross-sectional view of a moving blade of an axial blower according to a first embodiment of the present invention, and FIG. 1B is a plan view.

【図2】図2は本発明の実施の第二の形態に係る軸流送
風機の動翼の断面図である。
FIG. 2 is a sectional view of a moving blade of an axial blower according to a second embodiment of the present invention.

【図3】図3は本発明の実施の第三の形態に係る軸流送
風機の動翼の断面図である。
FIG. 3 is a sectional view of a moving blade of an axial blower according to a third embodiment of the present invention.

【図4】図4(a)は従来の軸流送風機の動翼の正面
図、同図(b)は側面図、同図(c)は断面図である。
4 (a) is a front view of a moving blade of a conventional axial flow fan, FIG. 4 (b) is a side view, and FIG. 4 (c) is a sectional view.

【符号の説明】[Explanation of symbols]

1 硬度の低い物質 2 プラットフォーム 3 ねじ付きのプラットフォーム 4 翼身部の段差部 5 ねじ部 6 ナット 7 ディスクの棚部 8 翼身部 DESCRIPTION OF SYMBOLS 1 Low-hardness substance 2 Platform 3 Threaded platform 4 Step part of wing part 5 Screw part 6 Nut 7 Disk shelf 8 Wing part

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 翼身部の段差部がディスクの棚部に挿入
されナットにより締結されて上記翼身部が上記ディスク
に固定される軸流送風機の動翼において、上記段差部と
上記棚部との間に硬度の低い物質を充填したことを特徴
とする軸流送風機の動翼。
1. A moving blade of an axial flow fan in which a step portion of a blade body is inserted into a shelf of a disk and fastened by a nut to fix the blade body to the disk, wherein the step and the shelf are fixed. A rotor blade of an axial blower, characterized by being filled with a material having a low hardness.
【請求項2】 翼身部の段差部がディスクの棚部に挿入
されナットにより締結されて上記翼身部が上記ディスク
に固定される軸流送風機の動翼において、上記翼身部の
プラットフォームと上記棚部とを密接に係合させるとと
もに上記段差部と上記棚部との間に互いの接触を抑止す
る十分な隙間を設けたことを特徴とする軸流送風機の動
翼。
2. A blade of an axial flow blower in which a step portion of a blade body is inserted into a shelf of a disk and fastened by a nut to fix the blade body to the disk. A rotor blade for an axial blower, wherein a sufficient clearance is provided between the step portion and the shelf portion so as to suppress the mutual contact between the step portion and the shelf portion.
JP16586496A 1996-06-26 1996-06-26 Rotor blade for axial blower Pending JPH109192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16586496A JPH109192A (en) 1996-06-26 1996-06-26 Rotor blade for axial blower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16586496A JPH109192A (en) 1996-06-26 1996-06-26 Rotor blade for axial blower

Publications (1)

Publication Number Publication Date
JPH109192A true JPH109192A (en) 1998-01-13

Family

ID=15820442

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16586496A Pending JPH109192A (en) 1996-06-26 1996-06-26 Rotor blade for axial blower

Country Status (1)

Country Link
JP (1) JPH109192A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013217220A (en) * 2012-04-05 2013-10-24 Mitsubishi Heavy Ind Ltd Fuel gas compressor, fuel gas compressor moving blade assembling method, and fuel gas compressor moving blade removing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013217220A (en) * 2012-04-05 2013-10-24 Mitsubishi Heavy Ind Ltd Fuel gas compressor, fuel gas compressor moving blade assembling method, and fuel gas compressor moving blade removing method

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