JP2554160B2 - Impeller core holding device - Google Patents
Impeller core holding deviceInfo
- Publication number
- JP2554160B2 JP2554160B2 JP1040301A JP4030189A JP2554160B2 JP 2554160 B2 JP2554160 B2 JP 2554160B2 JP 1040301 A JP1040301 A JP 1040301A JP 4030189 A JP4030189 A JP 4030189A JP 2554160 B2 JP2554160 B2 JP 2554160B2
- Authority
- JP
- Japan
- Prior art keywords
- core holding
- notch
- impeller
- stepped shaft
- holding device
- 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 - Fee Related
Links
Landscapes
- Supercharger (AREA)
- 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、高速回転機器の羽根車が高速回転中でも芯
を保持できるようにした羽根車の芯保持装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller core holding device capable of holding a core even when an impeller of a high-speed rotating machine rotates at high speed.
従来の技術 回転機器の回転軸に羽根車を取り付ける手段として、
最も単純なものとしては焼きばめ方式が知られている
が、その他としては、第６図に示すテンションボルト方
式、及び第７図に示すテーパ方式が一般的なものであ
る。As a means for attaching an impeller to the rotary shaft of a rotating device,
Although the shrink-fitting method is known as the simplest method, the tension bolt method shown in FIG. 6 and the taper method shown in FIG. 7 are other common methods.
第６図に示すテンションボルト方式は、回転軸１の端
に直径を若干細くした段付軸部２を形成し、ここに羽根
車３のディスク４をきつめの嵌め合いとなるように嵌合
させ、軸１の端より締付けナット５を螺合し、デイスク
４を固定したものである。この方式では、回転軸１の端
面と締付けナット５の締付け部との摩擦で羽根車３の芯
保持を行っている。In the tension bolt method shown in FIG. 6, a stepped shaft portion 2 having a slightly reduced diameter is formed at the end of a rotary shaft 1, and a disc 4 of an impeller 3 is fitted therein so as to be a tight fit. Then, the tightening nut 5 is screwed from the end of the shaft 1 and the disk 4 is fixed. In this method, the center of the impeller 3 is held by friction between the end surface of the rotary shaft 1 and the tightening portion of the tightening nut 5.
また、第７図に示すテーパ方式のものは、段付軸部６
がテーパ状に形成されており、ここに同じテーパ状の貫
通孔を形成した羽根車３のディスク４を嵌合させて、軸
１の端より締付けナット５を螺合し、デイスク４を固定
したものである。この方式では、回転軸１の端面と締付
けナット５の締付け部とに生ずる摩擦の他に、テーパ状
の段付軸部６全体に生じる摩擦で羽根車３の芯保持を行
っている。The taper type shown in FIG. 7 has a stepped shaft portion 6
Is formed in a tapered shape, and the disk 4 of the impeller 3 having the same tapered through hole is fitted therein, and the tightening nut 5 is screwed from the end of the shaft 1 to fix the disk 4. It is a thing. In this method, the impeller 3 is core-held by friction generated on the entire end surface of the rotary shaft 1 and the tightening portion of the tightening nut 5, as well as friction generated on the entire tapered stepped shaft portion 6.
発明が解決しようとする課題 ところで、回転軸１が高速で回転するときには、遠心
力のために、第８図に示すように、羽根車３の内径が膨
らんで隙間ｇを生じるとともに、軸方向の長さが縮む現
象が生じ、回転が高速になればなるほどその量が増大し
て、芯保持力が弱まってしまうものであった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, when the rotary shaft 1 rotates at high speed, due to centrifugal force, the inner diameter of the impeller 3 swells to form a gap g as shown in FIG. The phenomenon in which the length is shortened occurs, and the amount thereof increases as the rotation speed increases, and the core holding force becomes weaker.
遠心力は回転数の二乗に比例して大きくなるので、従
来の芯保持方式では20,000ないし30,000rpm程度が限界
であり、それ以上の回転数での芯保持を行うには、焼き
ばめ方式では焼きばめ代を過大なものとする必要があ
り、テンションボルト方式でも過大トルクとなり、さら
にテーパ方式のものも過大な押し込み代となるために、
いずれも材料が降伏してしまうので実現が困難であっ
た。Since the centrifugal force increases in proportion to the square of the number of rotations, the conventional core holding method has a limit of about 20,000 to 30,000 rpm, and in order to hold the core at a rotation speed higher than that, the shrink fitting method Since it is necessary to make the shrink fitting amount excessive, even the tension bolt type will cause excessive torque, and the taper type will also cause an excessive pushing amount.
In both cases, the material yielded and it was difficult to achieve.
このように従来の芯保持手段は、高速回転になればな
るほど芯保持力が弱まる現象を生じ、芯保持力を強くし
ようとすれば材料が降伏してしまうため、30,000rpm程
度の回転数までが限度であったが、本発明はそれ以上の
高速回転機器にも適合する芯保持手段を提供することを
目的とする。As described above, the conventional core holding means causes a phenomenon in which the core holding force becomes weaker as the rotation speed becomes higher, and the material yields if the core holding force is increased, so that the rotation speed up to about 30,000 rpm is reached. Although limited, the present invention aims to provide a core holding means that is suitable for higher speed rotating equipment.
課題を解決するための手段 本発明は、このような従来技術の課題を解決するため
に、回転軸の端に形成した段付軸部に回転翼のディスク
を嵌合させ、軸端より締付けナットを螺合し、デイスク
を固定した羽根車において、段付軸部に嵌合される前記
ディスクの挿入孔の内周面に円周方向にわたって切込み
を形成するとともに、この切込み内に切込み幅の中心よ
り軸方向に離隔した位置に円周方向にわたって凸部を形
成し、この切込み内に前記凸部と段付軸部との間に円周
方向に複数に分割された円周板を挿入したものである。Means for Solving the Problems In order to solve the problems of the prior art, the present invention fits a disc of a rotary blade to a stepped shaft portion formed at the end of a rotary shaft and tightens a nut from the shaft end. In the impeller in which the disc is fixed by screwing, the notch is formed in the inner peripheral surface of the insertion hole of the disc fitted in the stepped shaft portion in the circumferential direction, and the center of the notch width is formed in the notch. A projecting part is formed in a circumferential direction at positions further apart from each other in the axial direction, and a circumferential plate divided into a plurality of parts in the circumferential direction is inserted between the projecting part and the stepped shaft part in this cut. Is.
作用 上記の手段によれば、回転翼が高速回転する際のディ
スクの切込み内に挿入した円筒板に働く遠心力のため
に、円筒板は切込みの凸部を支点としてこの凸部からの
距離が長い方は外側に、短い方は内側にそれぞれ動くこ
とになる。この内側に動く方によって、円筒板が回転軸
を抱え込むように押さえつけるので、芯保持が行える。Action According to the above means, due to the centrifugal force acting on the cylindrical plate inserted into the notch of the disk when the rotary blade rotates at a high speed, the cylindrical plate has a distance from the convex part of the notch as a fulcrum. The longer one will move outward and the shorter one will move inward. By this inward moving direction, the cylindrical plate presses the rotary shaft so as to hold it, so that the core can be held.
実施例 以下本発明の一実施例を第１図ないし第５図を参照し
て詳細に説明する。なお、これらの図において、第６図
ないし第８図と同一の部分には同一符号を付して示して
あるので、その部分の説明は省略する。Embodiment An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 5. In these figures, the same parts as those in FIGS. 6 to 8 are designated by the same reference numerals and the description thereof will be omitted.
第１図は本発明に係る羽根車の芯保持装置の一実施例
を示した断面図であり、第２図は第１図のII−II線に沿
う断面図、そして第３図は第１図のIII部の拡大図であ
る。FIG. 1 is a cross-sectional view showing an embodiment of an impeller core holding device according to the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. It is an enlarged view of the III section of a figure.
これらの図において、10はディスク４の内周面に円周
方向にわたって形成された仕込みであり、回転軸１の段
付軸部２に対向して１または２以上形成されている。こ
の実施例では、２つの切込みが示されている。そして、
この切込み10内には、仕込み10の幅の中心より軸方向に
離隔した位置に円周方向にわたって凸部11が形成されて
いる。また、この凸部11の先端と段付軸部２との間には
所定の隙間が設けられており、凸部11を含む切込み10の
内に、例えば円周方向に４分割された円筒板12が段付軸
部２を囲むように挿入されている。第４図は円筒板12を
示した斜視図であり、その内径Ｄが段付軸部２の外径に
なる。In these drawings, reference numeral 10 denotes a charge formed on the inner peripheral surface of the disk 4 in the circumferential direction, and one or more of them are formed so as to face the stepped shaft portion 2 of the rotary shaft 1. In this example, two notches are shown. And
In the cut 10, a convex portion 11 is formed in the circumferential direction at a position separated from the center of the width of the charging 10 in the axial direction. A predetermined gap is provided between the tip of the convex portion 11 and the stepped shaft portion 2, and a cylindrical plate divided into four in the circumferential direction, for example, in the notch 10 including the convex portion 11. 12 is inserted so as to surround the stepped shaft portion 2. FIG. 4 is a perspective view showing the cylindrical plate 12, and the inner diameter D thereof becomes the outer diameter of the stepped shaft portion 2.
このように、仕込み10内に円筒板12の挿入された回転
翼３は、きつめの嵌め合いで段付軸部２に嵌合され、端
面を締付けナット５により規定トルクで締付けて固定し
ている。In this way, the rotary blade 3 in which the cylindrical plate 12 is inserted in the preparation 10 is fitted into the stepped shaft portion 2 by a tight fit, and the end face is tightened and fixed by the tightening nut 5 at a specified torque. There is.
本発明の羽根車の芯保持装置は上記のような構成であ
り、次のように作用する。The core holding device for the impeller of the present invention is configured as described above and operates as follows.
すなわち、第５図に示すように、凸部11の中心に対し
て円筒板12が、l1:l2＝1:4の関係となるように位置して
おり、円筒板12が等分割された５つの部材ａないしｅの
集合から成っているものとすれば、部材a,bに作用する
遠心力F1,F2はキャンセルされ、残った部材c,d,eに作用
する遠心力F3は、全体の3F/5となり、これが凸部11の中
心からの円筒板12の長さ とによってモーメントを形成して、押し付け力ｆを生
じ、この力ｆでもって段付軸部２を押さえ付ける。That is, as shown in FIG. 5, the cylindrical plate 12 is positioned with respect to the center of the convex portion 11 in a relationship of l 1 : l 2 = 1: 4, and the cylindrical plate 12 is equally divided. If it consists of a set of five members a to e, the centrifugal forces F 1 and F 2 acting on the members a and b are canceled and the centrifugal force F acting on the remaining members c, d and e. 3 is 3F / 5 of the whole, which is the length of the cylindrical plate 12 from the center of the convex portion 11. A moment is formed by and to generate a pressing force f, and the stepped shaft portion 2 is pressed by this force f.
従って、回転翼１の回転中に円筒板12に作用する遠心
力によって、第３図に示すように、円筒板12の長い方12
bは切込み10内の周壁側へ移動し、凸部11を支点とした
テコの原理で、円筒板12の短い方12aが回転軸１側へ移
動して回転軸１を押え込むようになるので、確実に芯保
持される。そして、回転数の二乗に比例して遠心力Ｆは
大きくなるので、回転が高速になればなるほど押し付け
力ｆも急激に大きくなって、芯保持力が強くなり、より
確実な芯保持ができるようになる。Therefore, due to the centrifugal force acting on the cylindrical plate 12 during the rotation of the rotary blade 1, as shown in FIG.
b moves to the peripheral wall side in the notch 10, and the shorter side 12a of the cylindrical plate 12 moves to the rotary shaft 1 side and presses the rotary shaft 1 by the lever principle with the convex portion 11 as a fulcrum. The core is securely held. Since the centrifugal force F increases in proportion to the square of the number of revolutions, the pressing force f increases rapidly as the rotation speed increases, and the core holding force becomes stronger, so that more reliable core holding can be performed. become.
なお、実際の運用にあたっては、回転軸１に回転翼３
を取り付け、締付けナット５で締付けることによって、
段付軸部２の端面と締付けナット５の端面との摩擦で芯
保持を行い、低速バランス調整をした後試運転を行って
芯保持の状態などを確認する。In actual operation, the rotary shaft 1 and the rotor 3
By attaching and tightening with the tightening nut 5,
The core is held by the friction between the end surface of the stepped shaft portion 2 and the end surface of the tightening nut 5, and after the low speed balance adjustment, a trial operation is performed to check the core holding state and the like.
発明の効果 以上詳述したように、本発明によれば、回転翼の回転
中に円筒板に作用する遠心力によって凸部を支点とした
テコの原理で円筒板の短い方が回転軸を押し付けて、確
実な芯保持を可能とし、かつ、高速回転になればなるほ
ど芯保持力が強くなるという大きな効果を発揮する羽根
車の芯保持装置が提供される。EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the shorter one of the cylindrical plates presses the rotating shaft by the lever principle with the convex portion as the fulcrum by the centrifugal force acting on the cylindrical plates during the rotation of the rotor blades. Thus, there is provided a core holding device for an impeller, which is capable of reliably holding the core and has a great effect that the core holding force becomes stronger as the rotation speed becomes higher.
第１図は本発明に係る羽根車の芯保持装置の一実施例の
断面図、第２図は第１図のII−II線に沿った断面図、第
３図は第１図のIII部拡大図、第４図は本発明に使用さ
れる円筒板の一例を示した斜視図、第５図は本発明の作
用を説明するために示した図、第６図及び第７図は従来
の羽根車の芯保持装置を説明した断面図、第８図は従来
の装置の問題点を説明するために示した説明図である。 １……回転軸、２……段付軸部、３……回転翼、４……
ディスク、５……締付けナット、10……切込み、11……
凸部、12……円筒板。FIG. 1 is a sectional view of an embodiment of an impeller core holding device according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a portion III of FIG. FIG. 4 is an enlarged view, FIG. 4 is a perspective view showing an example of a cylindrical plate used in the present invention, FIG. 5 is a view shown for explaining the operation of the present invention, and FIGS. FIG. 8 is a cross-sectional view for explaining the core holding device of the impeller, and FIG. 8 is an explanatory diagram for explaining the problems of the conventional device. 1 ... Rotary axis, 2 ... Stepped shaft section, 3 ... Rotary blade, 4 ...
Disc, 5 ... tightening nut, 10 ... notch, 11 ...
Convex part, 12 ... Cylindrical plate.
Claims (1)
ディスクを嵌合させ、軸端より締付けナットを螺合し、
ディスクを固定した羽根車において、前記段付軸部に嵌
合される前記ディスクの挿入孔の内周面に円周方向にわ
たって切込みを形成するとともに、この切込み内に切込
み幅の中心より軸方向に離隔した位置に円周方向にわた
って凸部を形成し、この切込み内に前記凸部と段付軸部
との間に円周方向に複数に分割された円筒板を挿入した
ことを特徴とする羽根車の芯保持装置。1. A disc of a rotary blade is fitted into a stepped shaft portion formed at the end of a rotary shaft, and a tightening nut is screwed from the shaft end,
In an impeller with a fixed disk, a notch is formed in the inner peripheral surface of the insertion hole of the disc fitted in the stepped shaft portion in the circumferential direction, and the notch is axially formed from the center of the notch width. A blade characterized in that a convex portion is formed in a circumferential direction at distant positions, and a cylindrical plate divided into a plurality in the circumferential direction is inserted between the convex portion and the stepped shaft portion in the notch. Car core holding device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040301A JP2554160B2 (en) | 1989-02-22 | 1989-02-22 | Impeller core holding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040301A JP2554160B2 (en) | 1989-02-22 | 1989-02-22 | Impeller core holding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02221601A JPH02221601A (en) | 1990-09-04 |
| JP2554160B2 true JP2554160B2 (en) | 1996-11-13 |
Family
ID=12576793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1040301A Expired - Fee Related JP2554160B2 (en) | 1989-02-22 | 1989-02-22 | Impeller core holding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2554160B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112272733B (en) * | 2018-08-07 | 2023-05-16 | 三菱重工发动机和增压器株式会社 | Turbine shaft assembly, supercharger and supercharger manufacturing method |
-
1989
- 1989-02-22 JP JP1040301A patent/JP2554160B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02221601A (en) | 1990-09-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |