JPS5929702A - Vibration damping construction of moving blade - Google Patents

Abstract

PURPOSE:To thin each part of a tie wire located between blades so as to reduce the centrifugal stress by sleeving said part of the tie wire which passes through a blade and welding the sleeve to the tie wire. CONSTITUTION:A sleeve 4 is fit to each part at which a tie wire 3 passes through a blade 1 and then welded to the tie wire 3. Thus, the tie wire 3 may gain larger thickness at only the part which passes through the blade.

Description

【発明の詳細な説明】 ターボ機械の動翼には特に翼長が大きくなると振動が生
じ易い。この振動は当然有害であるので従来第１図に斜
視図で示すようなタイワイヤで翼同志をその翼列に亘っ
てつなぐ制振方式がよく用いられる。図で１は動翼、２
はタイワイヤの貫通孔、６はタイワイヤである。タイワ
イヤの制振作用は翼１とタイワイヤ３との間の摩擦によ
るものなので、タイワイヤの摩耗切断の対策として第２
図のようにワイヤ３の孔２の貫通部分３ａのみを太くし
翼間部分３ｂは遠心力の増大を来さぬよう充分細くした
形状のタイワイヤが特許５３−１１９７７３（特開５７
−４４７０５）で提案されている。しかしこのような太
い部分と細い部分とを交互にもつワイヤの製作は工費の
かさむ作業である。それで本発明はタイワイヤを第３図
のように細いワイヤ３に翼の貫通部分にスリーブ４をは
め、これをワイヤ３に溶接５する構造をとることとした
。あるいはタイワイヤ３に対する翼の孔には第４図のよ
うに翼にスリーブ６を溶接７し、タイワイヤ３はスリー
ブ６を通すこととした。DETAILED DESCRIPTION OF THE INVENTION Vibrations are likely to occur in the rotor blades of turbomachines, especially when the blade length becomes large. Since this vibration is of course harmful, conventionally a vibration damping method is often used in which the blades are connected across the blade cascade using tie wires as shown in the perspective view of FIG. In the figure, 1 is the rotor blade, 2
6 is a tie wire through hole, and 6 is a tie wire. Since the vibration damping effect of the tie wire is due to the friction between the blade 1 and the tie wire 3, the second measure against wear and tear of the tie wire is
As shown in the figure, a tie wire having a shape in which only the penetrating portion 3a of the wire 3 through the hole 2 is thick and the inter-blade portion 3b is sufficiently thin to prevent an increase in centrifugal force is disclosed in Patent No. 53-119773 (JP 57
-44705). However, manufacturing such a wire having alternating thick and thin portions is an expensive process. Therefore, in the present invention, as shown in FIG. 3, the tie wire is constructed such that a sleeve 4 is fitted onto a thin wire 3 at the portion through which the blade passes, and this is welded 5 to the wire 3. Alternatively, a sleeve 6 is welded 7 to the wing as shown in FIG. 4 in the hole in the wing for the tie wire 3, and the tie wire 3 is passed through the sleeve 6.

第３図のものでは第２図のもののタイワイヤの製作のよ
うに手数のかかることなくしかも第２図のものと同様の
効果が得られ、第４図のものではタイワイヤと振動部分
との接触面積が大きくなることにより、タイワイヤに対
する応力、摩耗の分散、さらには翼の孔から生ずる翼の
クランクの防止に役立つ。In the case of the one in Fig. 3, it is possible to obtain the same effect as the one in Fig. 2 without requiring the trouble of manufacturing the tie wire in the one in Fig. 2, and in the case of the one in Fig. 4, the contact area between the tie wire and the vibrating part. The increased .DELTA. is helpful in distributing stress and wear on the tie wires and also in preventing wing cranking resulting from the wing holes.

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

第１図は従来のターボ機械動翼の制振方式を示す斜視図
、第２図は従来のタイワイヤの動翼貫通部分のみを太く
した構造の、第６図は本発明のタイワイヤの動翼貫通部
にスリーブをかぶせてワイヤに溶接した構造の、第４図
は同動翼の孔にタイワイヤの通るスリーブを溶接した構
造の、何れも動翼の横断面図である。 １　動翼 ２　タイワイヤの貫通孔 ３　タイワイヤ ３ａ同孔貫通部分 ３ｂ同翼間部分 ４．６　スリーブ ５．７　溶接 第玉　　　　　　　　　　′：４２図 第３図　　　　　　　　　茅４図Fig. 1 is a perspective view showing a conventional vibration damping system for turbomachinery rotor blades, Fig. 2 shows a structure in which only the part of the conventional tie wire that penetrates the rotor blade is thickened, and Fig. 6 shows the tie wire of the present invention that penetrates the rotor blade. FIG. 4 is a cross-sectional view of a rotor blade in which a sleeve is placed over the rotor blade and welded to a wire, and FIG. 4 is a cross-sectional view of a rotor blade in which a sleeve through which a tie wire passes is welded to a hole in the rotor blade. 1 Moving blade 2 Tie wire through hole 3 Tie wire 3a through-hole portion 3b inter-blade portion 4.6 Sleeve 5.7 Welding ball ′: 42, 3, and 4

Claims (1)

【特許請求の範囲】 １）ターボ機械動翼にロータ周方向の孔を穿ってこれに
その翼列を連ねるタイワイヤをおく制振構造において、
タイワイヤの翼の貫通個所にスリーブをかぶせてこれを
タイワイヤに溶接した構造。 ２）ターボ機械動翼にロータ周方向の孔を穿ってこれに
その翼列を連ねるタイワイヤをおく構造において、上記
動翼の孔にタイワイヤの通るスリーブを溶接した構造。[Claims] 1) A vibration damping structure in which holes are bored in the rotor circumferential direction in the turbomachinery blades and tie wires connecting the blade rows are placed in the holes,
A structure in which a sleeve is placed over the point where the tie wire passes through the wing, and this is welded to the tie wire. 2) A structure in which a hole in the circumferential direction of the rotor is bored in a turbomachine rotor blade and a tie wire connecting the blade rows is placed in the hole, and a sleeve through which the tie wire passes is welded to the hole in the rotor blade.