JPH0681886B2 - Axial flow machine blades - Google Patents
Axial flow machine bladesInfo
- Publication number
- JPH0681886B2 JPH0681886B2 JP63137548A JP13754888A JPH0681886B2 JP H0681886 B2 JPH0681886 B2 JP H0681886B2 JP 63137548 A JP63137548 A JP 63137548A JP 13754888 A JP13754888 A JP 13754888A JP H0681886 B2 JPH0681886 B2 JP H0681886B2
- Authority
- JP
- Japan
- Prior art keywords
- blades
- connecting member
- blade
- moving
- tenon
- 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.)
- Expired - Lifetime
Links
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、軸流流体機械の動翼装置、たとえば蒸気ター
ビンやガスタービン等に採用されている動翼装置の改良
に係り、特に動翼の外周部に動翼支持補強用の翼結合体
を有するこの種動翼装置の改良に関するものである。Description: TECHNICAL FIELD The present invention relates to improvement of a moving blade device of an axial fluid machine, for example, a moving blade device used in a steam turbine, a gas turbine, or the like, and more particularly to a moving blade. The present invention relates to an improvement of this type of blade apparatus having a blade combination for supporting and reinforcing the blades on the outer peripheral portion of.
従来一般に採用されている大容量のこの種動翼装置は、
複数個の動翼が回転体の周囲に周方向に所定の間隔を保
って配置されており、そしてさらにこの動翼の外周部
に、各動翼の外周側端に固定され、かつ、動翼相互間に
連結保持している翼結合体が設けられている。The large-capacity seed blade device that has been generally adopted in the past,
A plurality of moving blades are arranged around the rotating body at a predetermined interval in the circumferential direction, and further fixed to the outer peripheral portion of each moving blade on the outer peripheral side end of each moving blade. A wing combination is provided which is interlocked and held between them.
この翼結合体については、今までにも多くの改良がなさ
れ、その構造形状は多種，多岐にわたっているが、大き
く分類すると次の２種に分けられよう。その一つとして
１リング構成があげられる。すなわち全周すべての動翼
を連結体（環状連結装置）で連結するものであり、一般
には全周１リング構造と云われている。２つめは群翼構
造と云われているもので、たとえば実開昭55-163405号
公報に記載されているように、複数個の動翼単位ごとに
連結体に切れ目があるものである。Many improvements have been made so far on this blade combination, and its structural shape is diverse and diversified, but it can be roughly classified into the following two types. One of them is the one-ring structure. That is, all the moving blades on the entire circumference are connected by a connecting body (annular connecting device), which is generally called a one-ring structure on the entire circumference. The second is what is called a group blade structure. For example, as described in Japanese Utility Model Laid-Open No. 55-163405, the connecting body has a break in each of a plurality of moving blade units.
このように形成されたこれらの動翼装置を、振動特性上
から比較してみると、全周１リング構造のものは、群翼
構造のものに比し、固有の振動モードの数は一般に多く
なるが、しかしタービン回転数の整数倍の周波数をもつ
励振力を受けた場合の共振点の数は、群翼構造のものに
比較しはるかに少なくなる。したがってタービンの運転
範囲において共振を回避した動翼設計を行う上で、この
全周１リング構造のものは非常に有利となる。Comparing these rotor blade devices formed in this way from the viewpoint of vibration characteristics, the one-ring structure with the entire circumference has a larger number of unique vibration modes than the group-wing structure. However, the number of resonance points when an excitation force having a frequency that is an integral multiple of the turbine speed is received is much smaller than that of the group wing structure. Therefore, in designing a moving blade that avoids resonance in the operating range of the turbine, this one-ring all-round structure is extremely advantageous.
このようにこの種大容量の動翼装置においては、振動特
性の面からは全周１リング構造のものが有利なのである
が、反面このものは全周連結されることから、熱や遠心
力による応力が一部分に集中しがちで、連結体が破損に
至る恐れがある。したがってこの全周一リング構造とす
る場合には、遠心力による機械的な応力及び熱応力が連
結体に影響しないように工夫する必要がある。As described above, in this type of large-capacity moving blade device, the one-ring structure around the entire circumference is advantageous from the viewpoint of vibration characteristics, but on the other hand, since this structure is connected all around, heat or centrifugal force causes The stress tends to concentrate on one part, which may lead to damage of the connector. Therefore, in the case of this all-round one-ring structure, it is necessary to devise so that mechanical stress and thermal stress due to centrifugal force do not affect the coupling body.
この全周１リング構造でありながら比較的連結体に影響
を及ぼさない、すなわち連結体に応力集中が生じない構
成として次のものが知られている。The following structure is known as a structure in which the connecting body is relatively unaffected, that is, stress concentration does not occur in the connecting body even though it is the one-ring structure around the entire circumference.
すなわち第５図及び第６図に基づきそのものを説明する
と、回転体１の周囲には周方向に間隔を保って動翼２が
配置されており、またこの動翼の外周部に翼結合体３が
配置されているが、この翼結合体３は複数個の動翼を連
結している連結部材４と、これら連結部材間を接続する
接続片５より構成されているのである。That is, the description will be given based on FIG. 5 and FIG. 6, in which the rotor blades 2 are arranged around the rotating body 1 at intervals in the circumferential direction, and the blade combination body 3 is provided on the outer peripheral portion of the rotor blades. The blade combination 3 is composed of a connecting member 4 connecting a plurality of moving blades and a connecting piece 5 connecting the connecting members.
この場合第６図から明らかとなるように、群の端部に位
置する動翼2a,2bには肩下げが行われ、すなわち他の部
分の動翼より短長に形成され、この短い動翼と連結部材
との間に接続片５が介在され、そしてこの接続片は、テ
ノン６のかしめにより連結部材４と結合されるようにな
っている。In this case, as is clear from FIG. 6, the blades 2a, 2b located at the end of the group are shoulder-shouldered, that is, formed to be shorter than the blades of other portions, and the short blades are formed. The connecting piece 5 is interposed between the connecting member 4 and the connecting member, and the connecting piece is joined to the connecting member 4 by caulking the tenon 6.
このように動翼群を形成する連結部材４と、これらの連
結部材間を結合している接続片５により、全体として全
周にわたり切れ目なく連結した１リング翼構造となさ
れ、かつ接続片の部分、すなわち連結部材の切れ目の部
分で応力集中が緩和されるように形成されているのであ
る。Thus, the connecting member 4 forming the moving blade group and the connecting piece 5 connecting the connecting members together form a one-ring blade structure in which the connecting members 4 are seamlessly connected over the entire circumference, and a portion of the connecting piece. That is, it is formed so that stress concentration is relaxed at the cut portion of the connecting member.
尚この装置に関連するものとして、たとえば実公昭62-1
2803号公報，実開昭61-51405号公報が挙げられる。As a device related to this device, for example, Japanese Utility Model Sho 62-1
2803 and Japanese Utility Model Laid-Open No. 61-51405.
以上のように構成された動翼装置であると、全周の動翼
が結合されることになり、前述もしたように励振力を受
けた場合の共振点の数は、群翼構造のもに比し少なくな
り、また接続片の結合部、すなわち動翼のテノンとこの
テノンに嵌合された接続片の穴との関係で、微小な相対
変化は許容されることから連結部材に悪影響を及ぼす応
力集中は緩和され、この点では有効なものとなるのであ
るが、反面この構成であると、隣接群翼を互に接結する
接続片が連結部材と同時にテノンによりかしめられるこ
とから、同時かしめ作業に神経が費やされること、ま
た、この接続片を取付けるために、群翼の両端にある動
翼を肩下げしなければならず、他の動翼と異なる形状に
加工する必要があるなど、組立てや加工が複雑となる嫌
いがある。さらに、このように形成された動翼装置の最
も重大な難点は、接続片と連結部材とを動翼先端部のテ
ノンをかしめることにより固定するようにしているが、
事故時や試験時等、タービンの回転による遠心力がこの
部材に大きく作用した場合、この接続板と連結部材を固
定しているテノン強度は必ずしも十分な余裕がなく、テ
ノン強度に悪影響を及ぼしてしまい、強度的な面で信頼
性が低いということである。With the rotor blade device configured as described above, the rotor blades around the entire circumference are coupled, and as described above, the number of resonance points when an exciting force is applied is the same as that of the group blade structure. In addition, because of the relationship between the joint of the connecting piece, that is, the tenon of the blade and the hole of the connecting piece fitted to this tenon, a minute relative change is allowed, which adversely affects the connecting member. The stress concentration exerted is relaxed and effective in this respect, but on the other hand, with this configuration, the connecting piece that connects the adjacent group blades to each other is caulked by the tenon at the same time as the connecting member. Nervousness is spent on caulking work, and in order to attach this connecting piece, the blades at both ends of the group blade must be shoulder-shouldered, and it is necessary to process it into a different shape from other blades. , I dislike the complicated assembly and processing. Further, the most serious difficulty of the moving blade device thus formed is to fix the connecting piece and the connecting member by caulking the tenon of the moving blade tip,
If the centrifugal force due to the rotation of the turbine exerts a large force on this member during an accident or during a test, the tenon strength that secures this connecting plate and the connecting member does not always have a sufficient margin, and the tenon strength is adversely affected. That is, the reliability is low in terms of strength.
本発明はこれに鑑みなされたもので、その目的とすると
ころは、連結部材の応力緩和が可能で、かつ強度的にも
堅牢であることは勿論、加工，組立が簡単であると共
に、蒸気タービンの効率を向上させることのできる軸流
流体機械の動翼装置を提供するにある。The present invention has been made in view of the above, and an object of the present invention is not only that the stress of the connecting member can be relaxed and also that it is robust in strength, it is easy to process and assemble, and the steam turbine is Another object of the present invention is to provide a moving blade device for an axial flow fluid machine capable of improving the efficiency of the above.
上記目的を達成するためには、動翼を群ごとに保持して
いる連結部材を、複数列に形成するとともに、この連結
部材の周方向端部が、隣接する連結部材の列間で同位置
とならないように配置、すなわち連結部材の切れ目が千
鳥状となるように配置すればよい。In order to achieve the above-mentioned object, the connecting members holding the moving blades for each group are formed in a plurality of rows, and the circumferential ends of the connecting members are located at the same position between the rows of the adjacent connecting members. Therefore, the connecting members may be arranged in a zigzag pattern.
また、蒸気流入側連結部材の厚みを蒸気流出側連結部材
の厚みより少なく形成するとよい。Further, the thickness of the steam inflow side connecting member may be smaller than that of the steam outflow side connecting member.
ここに、本発明は、回転体に周囲に配置された複数個の
動翼及び、前記動翼に固定され、複数個の動翼を跨い
で、動翼の群れとして保持する翼結合体を備えた軸流流
体機械の動翼装置において、前記翼結合体は、蒸気の流
入方向に対して前列と後列との連結部材に別けて形成さ
れ、更に、前列の厚みが後列の厚みより少なく形成され
ると共に、前記連結部材の周方向の端部は、前記動翼の
反り方向と略同一方向になるように隣接し、前列と後列
との間で千鳥状となるように配置したものである。Here, the present invention comprises a plurality of moving blades arranged around a rotating body, and a blade combination fixed to the moving blades and straddling the plurality of moving blades and holding the blades as a group of moving blades. In the moving blade device of an axial flow fluid machine, the blade combination is formed separately in the connecting member of the front row and the rear row in the inflow direction of steam, and further, the thickness of the front row is formed to be smaller than the thickness of the rear row. In addition, the end portions in the circumferential direction of the connecting members are adjacent to each other in the same direction as the warp direction of the moving blades, and are arranged in a staggered manner between the front row and the rear row.
すなわち以上のような構成であると、周方向に隣接して
いる動翼のすべてが、複数列ある連結部材のうちいずれ
かの連結部材にて互いに連結されることになり、全周の
動翼が連結された全周１リング構造のものと同一の作用
をなし、またこれらの結合が千鳥状結合であることか
ら、ある程度の相対変位は許容され、したがって遠心力
による応力や熱応力は許容され、また各動翼に設けられ
ているテノンが負う機械的負荷はすべて同一量で局部的
に大きな負荷となる部分はなくなり、また特に動翼は特
殊な形状のものを必要とせず、すなわち同一形状のもの
でよく、動翼の加工は容易となるのである。That is, with the above configuration, all of the moving blades that are adjacent to each other in the circumferential direction are connected to each other by any one of the connecting members in a plurality of rows. Has the same effect as the one-ring structure in which all are connected, and because these connections are staggered, some relative displacement is allowed, and therefore stress due to centrifugal force and thermal stress are allowed. Also, the mechanical load that the tenon provided on each blade bears is the same, and there is no locally large load, and the blade does not need to have a special shape, that is, the same shape. The blades can be any of the above, and the processing of the rotor blades becomes easy.
また、蒸気流入側連結部材の厚みを蒸気流出側連結部材
の厚みより少なく形成すると、動翼に付着した水分が、
遠心力によりすみやかに連結部材の列間を介して動翼装
置外部へ排出されるので、タービン損失を減少させる。If the thickness of the steam inflow side connecting member is made smaller than the thickness of the steam outflow side connecting member,
The turbine is promptly discharged to the outside of the moving blade device through the space between the rows of the connecting members by the centrifugal force, so that the turbine loss is reduced.
以下図示した実施例に基づいて本発明を詳細に説明す
る。The present invention will be described in detail based on the illustrated embodiments.
第１図及び第２図にはその動翼装置の要部が斜視図で平
面図で示されている。動翼２は回転体１の周囲に、径方
向にのび、かつ周方向に所定の間隔を保って配置されて
おり、そして動翼２の先端には連結部材4a,4bを取付け
るための２個のテノン、すなわち蒸気流入側に位置する
テノン6aと蒸気流出側に位置するテノン6bが設けられて
いる。In FIG. 1 and FIG. 2, a main part of the rotor blade device is shown in a plan view in a perspective view. The moving blades 2 are arranged around the rotating body 1 in the radial direction and at a predetermined interval in the circumferential direction, and two blades are provided at the tip of the moving blades 2 for attaching the connecting members 4a, 4b. , Namely, a tenon 6a located on the steam inflow side and a tenon 6b located on the steam outflow side.
連結部材4a,4bは、それぞれ蒸気流入側と流出側に、す
なわち、略同一半径上で軸方向の異なる位置に２列設け
られている。蒸気流入側の連結部材4aには、図で見えな
いが動翼間隔に合致したテノン穴が設けられており、こ
のテノン穴部を蒸気流入側テノン6aに挿入した後、この
テノン6aをかしめることによりこの連結部材4aと動翼２
との結合が行われる。すなわち連結部材が動翼に固定さ
れる。同様に、蒸気流出側連結部材4bも、蒸気流出側テ
ノン6bによって動翼に固定される。この場合連結部材は
複数の動翼に跨がりそれぞれ複数の動翼を連結して群翼
構造を形成している。１つの群翼構造を形成する翼本数
は、通常４〜８本位である。第２図の場合には４本の場
合が示されている。ここで重要なことは、隣接群翼の
境、すなわち、連結部材の切れ目は、蒸気流入側連結部
材4aの切れ目７と蒸気流出側連結部材4bの切れ目８が、
互に円周方向にずれて、隣接する同じ動翼間にないよう
に配置されることである。すなわち連結部材の周方向端
部が隣接列間で千鳥状となるように形成されることであ
る。このような翼連結が全周の翼についてなされてい
る。これにより、周方向に隣接するどの動翼も、蒸気流
入側連結部材4aと蒸気流出側連結部材4bのうちどちらか
一方の連結部材で互に連結されることになり、全周の翼
を切れ目なく連結した全周１リング構造となり、機械的
に堅牢な動翼の保持が可能なことは勿論、共振点の少な
い構成となる。The connecting members 4a and 4b are provided in two rows on the steam inflow side and the steam outflow side, that is, at different positions in the axial direction on substantially the same radius. The connecting member 4a on the steam inflow side is provided with a tenon hole which is not visible in the figure and which matches the moving blade spacing.After inserting this tenon hole into the tenon 6a on the steam inflow side, the tenon 6a is caulked. As a result, this connecting member 4a and the moving blade 2
Is combined with. That is, the connecting member is fixed to the moving blade. Similarly, the steam outflow side connecting member 4b is also fixed to the moving blade by the steam outflow side tenon 6b. In this case, the connecting member straddles a plurality of moving blades and connects the plurality of moving blades to form a group blade structure. The number of blades forming one group blade structure is usually about 4 to 8. In the case of FIG. 2, four cases are shown. What is important here is that the boundary between the adjacent group blades, that is, the cut of the connecting member is the cut 7 of the steam inflow side connecting member 4a and the cut 8 of the steam outflow side connecting member 4b.
They are arranged so that they are circumferentially offset from each other so that they are not between the same adjoining blades. That is, the circumferential ends of the connecting members are formed in a zigzag pattern between adjacent rows. Such a blade connection is made for the blades on the entire circumference. As a result, any of the moving blades adjacent in the circumferential direction will be connected to each other by either one of the steam inflow side connecting member 4a and the steam outflow side connecting member 4b, and the blades around the entire circumference will be cut. The structure is a single ring all-round structure that is not connected, and mechanically robust moving blades can be held, and the structure has few resonance points.
また、この構成があると、一部のテノン部のみに負荷が
かかることなく熱応力緩和も可能となるのである。すな
わち連結部材が軸方向に並設されて固定されるので、テ
ノンが負う負荷はすべて同一となり、一部のテノンのみ
が過負荷となることはないのである。又、一般にテノン
はテノン穴との関係は、テノン穴径がテノン径よりも、
やや大き目に作られるのが普通で、このため、テノンを
かしめることによって連結部材４が動翼２に固定された
後であっても、動翼と連結部材の円周方向，軸方向の微
小な相対変位は許容されるのである。Also, with this configuration, thermal stress can be relaxed without applying a load to only some of the tenon portions. That is, since the connecting members are arranged side by side in the axial direction and are fixed, the tenons bear the same load, and only some of the tenons do not become overloaded. Also, in general, the relationship between tenon and tenon hole is that the diameter of tenon is larger than the diameter of tenon.
It is usually made a little larger. Therefore, even after the connecting member 4 is fixed to the moving blade 2 by caulking the tenon, the moving blade and the connecting member are fine in the circumferential and axial directions. Such relative displacement is allowed.
このように、この構成であると、一般に全く切れ目のな
い全周１リング構造とした時問題となる遠心力や熱応力
等による連結部材の伸び、及び動翼と連結部材の変形差
などが充分許容され、また連結部材の切れ目で吸収され
ることにより連結部材に過大な応力が発生することはな
いのである。As described above, with this configuration, the elongation of the connecting member due to centrifugal force, thermal stress, etc., which is generally a problem in the case of a completely-circumferential 1-ring structure without breaks, and the deformation difference between the moving blade and the connecting member are sufficient. No excessive stress is generated in the connecting member due to the allowance and absorption at the break of the connecting member.
さらに、本実施例では、翼振動に対する減衰を高める効
果を有効に発揮できる構造とすることも可能なのであ
る。すなわち、第２図を用いて説明すると、蒸気流入側
連結部材4aと蒸気流出側連結部材4bとを、互に円周方向
に延びる接触面９で両者が押圧接触となるように配置す
るのである。このようにすると、翼振動発生時に、各動
翼相互の相対振動変位、あるいは、動翼のねじり振動に
よる、動翼の蒸気流入側と流出側の相対振動変位が生じ
た場合、この２つの連結部材の接触面９に摩擦部分、す
なわち振動減衰部分があるため、翼振動の低減を図るこ
とができるのである。Further, in the present embodiment, it is possible to have a structure capable of effectively exhibiting the effect of increasing the damping of the blade vibration. That is, referring to FIG. 2, the steam inflow side connecting member 4a and the steam outflow side connecting member 4b are arranged such that they are in pressure contact with each other at the contact surfaces 9 extending in the circumferential direction. . With this configuration, when the blade vibration occurs, when the relative vibration displacement between the moving blades or the relative vibration displacement between the steam inflow side and the outflow side of the moving blade due to the torsional vibration of the moving blades, these two couplings are connected. Since the contact surface 9 of the member has a friction portion, that is, a vibration damping portion, it is possible to reduce blade vibration.
尚、以上説明してきた実施例では、一つの連結部材が群
翼として連結する翼の本数を４本となし、かつそれが全
周にわたり同じ本数の場合について説明してきたが、一
般に全周の翼本数は、種々の要件、たとえば、熱的，流
体的，強度的，振動的要件等から決められるものであ
り、第２図の実施例のように、すべて４本ずつの群翼、
すなわち全周同一の群翼本数にできない場合がある。そ
のような場合には各群の翼本数は異なることになるが、
その場合であっても本発明は適用可能である。この場合
であっても、蒸気流入側の連結部材と蒸気流出側の連結
部材の切れ目は、円周方向の隣接する同じ翼間に重なら
ないようにすることは重要なことである。In the embodiments described above, the case where one connecting member connects four blades as a group blade and the number of blades is the same over the entire circumference has been described. The number is determined from various requirements, for example, thermal, fluid, strength, vibrational requirements, etc., and as in the embodiment of FIG. 2, all four group blades,
That is, it may not be possible to have the same number of group blades all around. In such a case, the number of wings in each group will be different,
Even in that case, the present invention can be applied. Even in this case, it is important that the cuts between the connecting member on the steam inflow side and the connecting member on the steam outflow side do not overlap between the same adjacent blades in the circumferential direction.
尚、第３図には、その例として蒸気流入側の連結部材4a
と流出側の連結部材4bによって連結される翼の本数が夫
々異なる（４本と５本）場合が示されている。又この他
の例として、蒸気流入側の連結部材で群翼として連結さ
れる翼本数は全周同一であるが、隣接している蒸気流出
側の連結部材間とでは翼本数が異なるような連結構造の
場合もあるであろう。In FIG. 3, as an example, the connecting member 4a on the steam inflow side is shown.
And the number of blades connected by the connecting member 4b on the outflow side are different (4 and 5), respectively. As another example, the number of blades connected as a group blade by the connecting member on the steam inflow side is the same all around, but the number of blades is different between adjacent connecting members on the steam outflow side. It may be a structure.
さらに、本実施例では、連結部材の周囲断面を示した第
４図にあるように、動翼外周がテーパ10を有するもの
で、複数列（図では２列）設けられている連結部材4a,4
bの、その隣接列間に所定の間隙ｇを設けるとともに、
連結部材の内周面側に段差Ｄを設けたものである。Further, in the present embodiment, as shown in FIG. 4 showing the peripheral cross section of the connecting member, the outer periphery of the moving blade has the taper 10, and the connecting members 4a, which are provided in a plurality of rows (two rows in the figure), are provided. Four
While providing a predetermined gap g between the adjacent rows of b,
A step D is provided on the inner peripheral surface side of the connecting member.
このように形成すると、矢印12で示すように動翼２に付
着した水分が遠心力によりすみやかにこの間隙ｇを介し
て動翼装置外部へ排出され、水分によるタービン損失を
減少させることができるのである。すなわち、第７図は
タービンの動翼装置周囲を示したもので、動翼２と静翼
20とが交互に配置され蒸気が実線矢印に流れているが、
動翼２に付着した水分は実線矢印Ｒで示すように流れ、
間隙ｇより固定子21側へ排出されるのである。If formed in this way, as shown by the arrow 12, the water adhering to the moving blade 2 is promptly discharged to the outside of the moving blade device through the gap g by the centrifugal force, and the turbine loss due to the water can be reduced. is there. That is, FIG. 7 shows the periphery of the moving blade device of the turbine.
20 and 20 are arranged alternately and the steam flows in the solid arrow,
Water attached to the rotor blade 2 flows as shown by a solid arrow R,
It is discharged from the gap g to the stator 21 side.
また、図のように動翼２の外周部のテーパ部に段差の切
込みを設けるようにしてもよいし、テーパ部は平滑にし
て連結部材4bの側部に突堤を設けるようにしてもよいで
あろう。Further, as shown in the figure, a step cut may be provided in the taper portion of the outer peripheral portion of the moving blade 2, or the taper portion may be smoothed and a jetty may be provided on the side portion of the connecting member 4b. Let's do it.
以上種々述べてきたように、本発明の動翼装置によれ
ば、動翼を結合している翼結合体を、蒸気の流入方向に
対して前列と後列との連結部材に別けて形成され、更
に、前列の厚みが後列の厚みより少なく形成されると共
に、前記連結部材の周方向の端部は、前記動翼の反り方
向と略同一方向になるように隣接し、前列と後列との間
で千鳥状となるように配置したから、複数個の動翼が連
結部材により連結された、いわゆる群翼構造を形成し、
またこの連結部材が複数列千鳥状に配置されていること
から一リング構造ともなり、堅牢にして熱応力の吸収が
可能なことは勿論、連結部材を支持している動翼に遠心
力による過大な応力が加わることなく、かつ動翼の形状
も全周同一のものを採用することが可能となる。As described above in various ways, according to the moving blade device of the present invention, the blade combined body that connects the moving blades is formed separately for the connecting members of the front row and the rear row with respect to the inflow direction of steam, Further, the thickness of the front row is formed to be smaller than the thickness of the rear row, and the end portions in the circumferential direction of the connecting member are adjacent to each other so as to be substantially in the same direction as the warp direction of the moving blade, and between the front row and the rear row. Since they are arranged in a zigzag pattern, a plurality of moving blades are connected by a connecting member to form a so-called group blade structure,
Further, since the connecting members are arranged in a zigzag pattern in a plurality of rows, the connecting members also have a one-ring structure, which is robust and capable of absorbing thermal stress. Of course, the rotor blades supporting the connecting members are excessive by centrifugal force. It is possible to adopt the same shape of the moving blade over the entire circumference without applying any stress.
また、連結部剤の厚み、即ち直列の厚みが後列の厚みよ
り少なく形成されるので、動翼に付着した水分が、遠心
力によりすみやかに連結部材の列間を介して動翼装置外
部へ排出され、タービン損失を減少させるので、蒸気タ
ービンの効率を向上させることができる。Further, since the thickness of the connecting agent, that is, the thickness in series, is formed to be smaller than the thickness of the rear row, the water adhering to the moving blades is quickly discharged to the outside of the moving blade device through the rows of the connecting members by the centrifugal force. As a result, the turbine loss is reduced and the efficiency of the steam turbine can be improved.
第１図は本発明の動翼装置の要部を示す一部断面斜視
図、第２図はその平面図、第３図は本発明の他の実施例
を示す平面図、第４図は本発明の動翼装置の連結部材周
囲の縦断面図、第５図は従来の動翼装置周囲を示す斜視
図、第６図は第５図のＡ−Ａ線に沿う断面図、第７図は
タービンの要部を示す縦断面図である。 １……回転体、２……動翼、4a,4b……連結部材、6a,6b
……テノン。FIG. 1 is a partial cross-sectional perspective view showing a main part of a rotor blade device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a plan view showing another embodiment of the present invention, and FIG. FIG. 5 is a perspective view showing the periphery of a connecting member of a moving blade device of the invention, FIG. 5 is a perspective view showing the periphery of a conventional moving blade device, FIG. 6 is a sectional view taken along the line AA of FIG. 5, and FIG. It is a longitudinal cross-sectional view showing a main part of the turbine. 1 ... Rotating body, 2 ... Moving blade, 4a, 4b ... Connecting member, 6a, 6b
...... Tenon.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭50−88402（ＪＰ，Ａ) 特公 昭47−14161（ＪＰ，Ｂ１) 特公 昭52−32401（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-50-88402 (JP, A) JP-B 47-14161 (JP, B1) JP-B 52-32401 (JP, B2)
Claims (1)
び、前記動翼に固定され、複数個の動翼を跨いで、動翼
の群れとして保持する翼結合体を備えた軸流流体機械の
動翼装置において、 前記翼結合体は、蒸気の流入方向に対して前列と後列と
の連結部材に別けて形成され、更に、前列の厚みが後列
の厚みより少なく形成されると共に、前記連結部材の周
方向の端部は、前記動翼の反り方向と略同一方向になる
ように隣接し、前列と後列との間で千鳥状となるように
配置されたことを特徴とする軸流流体機械の動翼装置。1. A shaft comprising a plurality of moving blades arranged around a rotating body, and a blade assembly fixed to the moving blades and straddling the plurality of moving blades and holding the blades as a group of moving blades. In a moving blade device for a flow fluid machine, the blade combination is formed separately in a connecting member of a front row and a rear row in a steam inflow direction, and further, a thickness of the front row is formed to be smaller than a thickness of the rear row. The circumferential ends of the connecting members are adjacent to each other in substantially the same direction as the warp direction of the moving blades, and are arranged in a staggered manner between the front row and the rear row. A rotor blade device for an axial fluid machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63137548A JPH0681886B2 (en) | 1988-06-06 | 1988-06-06 | Axial flow machine blades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63137548A JPH0681886B2 (en) | 1988-06-06 | 1988-06-06 | Axial flow machine blades |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01310103A JPH01310103A (en) | 1989-12-14 |
| JPH0681886B2 true JPH0681886B2 (en) | 1994-10-19 |
Family
ID=15201273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63137548A Expired - Lifetime JPH0681886B2 (en) | 1988-06-06 | 1988-06-06 | Axial flow machine blades |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0681886B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3107266B2 (en) * | 1993-09-17 | 2000-11-06 | 株式会社日立製作所 | Fluid machinery and wing devices for fluid machinery |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5088402A (en) * | 1973-12-12 | 1975-07-16 | ||
| JPS5232401A (en) * | 1975-09-08 | 1977-03-11 | Hitachi Ltd | Indoor boiler control system |
-
1988
- 1988-06-06 JP JP63137548A patent/JPH0681886B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01310103A (en) | 1989-12-14 |
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