JP2009228774A - Rotary member installing structure, rotary machine and centrifugal compressor - Google Patents

Rotary member installing structure, rotary machine and centrifugal compressor Download PDF

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Publication number
JP2009228774A
JP2009228774A JP2008074486A JP2008074486A JP2009228774A JP 2009228774 A JP2009228774 A JP 2009228774A JP 2008074486 A JP2008074486 A JP 2008074486A JP 2008074486 A JP2008074486 A JP 2008074486A JP 2009228774 A JP2009228774 A JP 2009228774A
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impeller
rotating
rotating member
connecting member
mounting structure
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Nobuyori Yagi
信頼 八木
Eiichi Yanagisawa
栄一 柳沢
Daisuke Kiuchi
大輔 木内
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary member installing structure, a rotary machine adopting this installing structure, and a centrifugal compressor, capable of restraining a rotary member from floating from a rotary shaft by centrifugal force, in the rotary machine for rotating the rotary member installed on the rotary shaft at a high speed together with the rotary shaft. <P>SOLUTION: An impeller installing structure is provided for installing impellers on the rotary shaft 3 in the centrifugal compressor for installing a plurality of impellers by inserting the rotary shaft 3, and is characterized in that a rear end part 41A of the front stage impeller 41 and a front end part 42A of the rear stage impeller 42 are connected by a connecting member 11, and the connecting member 11 has a first engaging part 11A engaging with the rear end part 41A and a second engaging part 11B engaging with the front end part 42A, and outward force in the radial direction generated in the rear end part 41A can be converted into inward force in the radial direction of the front end part 42A. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、回転軸に取り付けられた回転部材が回転軸とともに高速回転される回転機械において回転部材が遠心力によって回転軸から浮き上がるのを抑制可能な回転部材の取付構造、この取付構造を備えた回転機械及び遠心圧縮機に関する。   The present invention includes a mounting structure for a rotating member capable of suppressing the rotating member from being lifted off the rotating shaft by centrifugal force in a rotating machine in which the rotating member mounted on the rotating shaft is rotated at a high speed together with the rotating shaft. The present invention relates to a rotary machine and a centrifugal compressor.

従来、例えば、遠心圧縮により流体を圧縮する場合、効率的に圧縮するために回転軸の軸線方向に複数のインペラが配列された多段インペラを用いる場合があるが、例えば、水素等の分子量が小さい流体を圧縮する場合には多段にするだけでは十分な仕事（ヘッド）が確保されないために、回転軸を、例えばインペラの周速を外径で４００m/s以上と従来の遠心圧縮機よりも高周速で回転させる必要があり、かかる遠心圧縮機に関する技術が開示されている（例えば、特許文献１参照。）。
特開２００３−２９３９８８号公報 Conventionally, for example, when compressing a fluid by centrifugal compression, a multi-stage impeller in which a plurality of impellers are arranged in the axial direction of the rotating shaft may be used in order to compress efficiently. For example, the molecular weight of hydrogen or the like is small When the fluid is compressed, sufficient work (head) is not ensured only by using multiple stages. Therefore, the rotating shaft, for example, the peripheral speed of the impeller is 400 m / s or more in outer diameter, which is higher than that of a conventional centrifugal compressor. It is necessary to rotate at a peripheral speed, and a technique relating to such a centrifugal compressor is disclosed (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2003-293988

しかしながら、上記遠心圧縮機をはじめとする回転軸が挿通された回転部材を高速回転する回転機械では、高速回転された回転部材が回転軸から浮き上がり、この浮き上がりにより回転部材が回転軸に対してすべりを生じる場合や浮き上がった回転部材が変形し又は浮き上がった回転部材が回転機械の周囲に接触することにより回転部材が変形する場合がある。   However, in a rotary machine that rotates a rotating member through which the rotating shaft is inserted, such as the above centrifugal compressor, at high speed, the rotating member that is rotated at a high speed is lifted from the rotating shaft, and the rotating member slides with respect to the rotating shaft by this lifting. In some cases, the rotating member that is lifted is deformed or the rotating member that is lifted contacts the periphery of the rotating machine.

本発明は、このような事情を考慮してなされたものであり、回転軸に取り付けられた回転部材が回転軸とともに高速回転される回転機械において遠心力によって回転部材が遠心力により回転軸から浮き上がるのを抑制することが可能な回転部材の取付構造、この取付構造を適用した回転機械及び遠心圧縮機を提供することを目的とする。   The present invention has been made in consideration of such circumstances. In a rotating machine in which a rotating member attached to a rotating shaft is rotated at a high speed together with the rotating shaft, the rotating member is lifted from the rotating shaft by centrifugal force. An object of the present invention is to provide a rotating member mounting structure capable of suppressing the above, a rotating machine and a centrifugal compressor to which the mounting structure is applied.

上記課題を解決するために、この発明は以下の手段を提案している。
請求項１記載の発明は、回転軸が挿通されて該回転軸の軸線方向に複数の回転部材が同軸上に取り付けられる回転機械において前記回転部材を前記回転軸に取り付ける回転部材の取付構造であって、第１の回転部材の前記軸線方向一方側の端部と、前記第１の回転部材に隣接する第２の回転部材の前記軸線方向他方側の端部とが、連結部材により接続され、前記連結部材は、前記一方側の端部と係合する第１の係合部と、前記他方側の端部と係合する第２の係合部とを備え、前記一方側の端部と前記他方側の端部のいずれか一方に発生する径方向外方への力を、他方の径方向内方への力に変換可能に構成されていることを特徴とする。 In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a rotating member mounting structure for mounting the rotating member to the rotating shaft in a rotary machine in which the rotating shaft is inserted and a plurality of rotating members are coaxially mounted in the axial direction of the rotating shaft. Then, an end portion on the one axial side of the first rotating member and an end portion on the other axial side of the second rotating member adjacent to the first rotating member are connected by a connecting member, The connection member includes a first engagement portion that engages with the one end portion, and a second engagement portion that engages with the other end portion, and the one end portion; It is configured to be able to convert a radially outward force generated at one of the other end portions into a radially outward force.

この発明に係る回転部材の取付構造によれば、第１の回転部材の一方側の端部と、第２の回転部材の他方側の端部のいずれか一方に発生する径方向外方への力（遠心力）を他方の径方向内方への力（押圧力）に変換されるので、回転数が増加して連結部材の一方に生じる遠心力が大きくなると他方を大きな力で押圧され、遠心力と押圧力に対する反力が互いに回転部材の浮き上がりを抑制するように作用する。その結果、回転部材の浮き上がりが効率的に抑制される。   According to the mounting structure of the rotating member according to the present invention, it is possible to radially outwardly generate at one of the one end of the first rotating member and the other end of the second rotating member. Since the force (centrifugal force) is converted into the other radial inward force (pressing force), when the rotational force increases and the centrifugal force generated in one of the connecting members increases, the other is pressed with a large force, The reaction force against the centrifugal force and the pressing force acts so as to suppress the lifting of the rotating member. As a result, lifting of the rotating member is efficiently suppressed.

請求項２記載の発明は、請求項1に記載の回転部材の取付構造であって、前記連結部材の前記軸線方向の長さＬは、
Ｌ＜Ａ／Ｋ
Ａ：２〜３
Ｋ＝（（３（１−（ν）２））／Ｒ２ｈ２）１／４
ν：連結部材を構成する材料のポアソン比
Ｒ：連結部材の半径（連結部材の内径＋（肉厚／２））（ｃｍ）
ｈ：連結部材の肉厚（ｃｍ）
であることを特徴とする。 Invention of Claim 2 is the attachment structure of the rotation member of Claim 1, Comprising: The length L of the said axial direction of the said connection member is the following.
L <A / K
A: 2-3
K = ((3 (1- (ν) 2 )) / R 2 h 2 ) 1/4
ν: Poisson's ratio of the material constituting the connecting member R: radius of the connecting member (inner diameter of connecting member + (wall thickness / 2)) (cm)
h: thickness of connecting member (cm)
It is characterized by being.

この発明に係る回転部材の取付構造によれば、連結部材の長さＬが、上記、Ｌ＜Ａ／Ｋを満足して、連結部材が厚肉円筒である場合の半無限長に該当しないので、連結部材の一方側の端部と他方側の端部のいずれか一方に発生する遠心力を他方の径方向内方への力に効率的に変換することができる。
また、上記式（１）により、連結部材の一方の端部に生じた曲げモーメントが他方の端部に曲げモーメントとして作用し回転部材の浮き上がりが効率的に抑制可能な連結部材を、寸法として定量的に求めることができるので、設計開発段階における開発コスト、製造における品質管理コスト等を低減することができる。 According to the rotating member mounting structure according to the present invention, the length L of the connecting member satisfies the above L <A / K and does not correspond to the semi-infinite length when the connecting member is a thick cylinder. The centrifugal force generated at one of the one end and the other end of the connecting member can be efficiently converted into the other radially inward force.
Further, according to the above formula (1), the dimension of the connecting member that can effectively suppress the lifting of the rotating member when the bending moment generated at one end of the connecting member acts as the bending moment at the other end is determined as a dimension. Therefore, development costs in the design and development stage, quality control costs in manufacturing, and the like can be reduced.

なお、この明細書における連結部材の前記軸線方向の長さＬとは、軸線方向における第１の回転部材の一方側の端部と連結部材、及び第２の回転部材の他方側の端部と連結部材のそれぞれにおける相互に力を伝達する作用点、（力学的な連結位置）同士間の距離を意味している。   Note that the length L in the axial direction of the connecting member in this specification refers to the end on one side of the first rotating member in the axial direction, the connecting member, and the end on the other side of the second rotating member. The point of action which transmits a force mutually in each of a connection member, and the distance between (dynamic connection position) are meant.

請求項３記載の発明は、請求項1又は請求項２に記載の回転部材の取付構造であって、前記第１の係合部は、前記一方側の端部を、外周面にて把持する壁部又は端面にて把持する凹凸形状部の少なくともいずれか一方からなり、前記第２の係合部は、前記他方側の端部を、外周面にて把持する壁部又は端面にて把持する凹凸形状部の少なくともいずれか一方からなることを特徴とする。   A third aspect of the present invention is the rotating member mounting structure according to the first or second aspect, wherein the first engaging portion grips the end portion on the one side with an outer peripheral surface. It consists of at least any one of the uneven | corrugated shaped part hold | gripped in a wall part or an end surface, and the said 2nd engaging part hold | grips the said other side edge part in the wall part or end surface hold | gripped in an outer peripheral surface It consists of at least any one of an uneven | corrugated shaped part, It is characterized by the above-mentioned.

この発明に係る回転部材の取付構造によれば、第１の係合部及び第２の係合部によって、一方側の端部と他方側の端部が力学的に確実に連結される。
その結果、第１の回転部材及び第２の回転部材の端部が浮き上がるのを抑制する力を確実に作用させることができる。 According to the rotating member mounting structure according to the present invention, the one end and the other end are mechanically and reliably connected by the first engaging portion and the second engaging portion.
As a result, the force which suppresses that the edge part of a 1st rotation member and a 2nd rotation member floats can be made to act reliably.

請求項４記載の発明は、回転機械であって、請求項1から請求項３のいずれか１項に記載の回転部材の取付構造を備えることを特徴とする。   A fourth aspect of the present invention is a rotary machine, and includes the rotating member mounting structure according to any one of the first to third aspects.

この発明に係る回転機械によれば、回転部材が回転軸に取り付けられた回転機械において、回転軸が高速で回転された場合にも回転部材の浮き上がりが抑制される。   According to the rotating machine according to the present invention, in the rotating machine in which the rotating member is attached to the rotating shaft, the floating of the rotating member is suppressed even when the rotating shaft is rotated at a high speed.

請求項５記載の発明は、遠心圧縮機であって、前記回転部材がインペラとされ、請求項1から請求項３のいずれか１項に記載の回転部材の取付構造を備えることを特徴とする。   The invention according to claim 5 is a centrifugal compressor, wherein the rotating member is an impeller, and includes the rotating member mounting structure according to any one of claims 1 to 3. .

この発明に係る遠心圧縮機によれば、例えば、水素等の圧縮が困難な気体についても、安定して圧縮することができる。   According to the centrifugal compressor according to the present invention, for example, a gas that is difficult to compress, such as hydrogen, can be stably compressed.

この発明に係る回転部材の取付構造によれば、第１の回転部材の一方側の端部と、第２の回転部材の他方側の端部のいずれか一方に発生する遠心力を、もう一方の端部における径方向内方への押圧力に変換するので、回転部材の浮き上がりを効率的に抑制することができる。
また、この発明に係る回転部材の取付構造を備えた回転機械によれば、回転軸を安定して高速回転することができる。
また、この発明に係る遠心圧縮機によれば、例えば、水素等の圧縮が困難な気体についても、安定して圧縮することができる。 According to the rotating member mounting structure according to the present invention, the centrifugal force generated at one of the end portion on one side of the first rotating member and the end portion on the other side of the second rotating member is supplied to the other end. Since it is converted into a pressing force inward in the radial direction at the end of the rotating member, it is possible to efficiently suppress the lifting of the rotating member.
Moreover, according to the rotating machine provided with the rotating member mounting structure according to the present invention, the rotating shaft can be stably rotated at a high speed.
Moreover, according to the centrifugal compressor which concerns on this invention, gas which cannot be compressed easily, such as hydrogen, for example, can be compressed stably.

以下、図１から図３を参照し、この発明の第１の実施形態について説明する。
図１は、インペラ（回転部材）を有する遠心圧縮機（回転機械）１の全体構成の概略を示す断面図である。遠心圧縮機１は、回転するインペラ４により、例えば水素等の流体（気体あるいは蒸気）をインペラ４の半径方向に通過させ、流体に発生する遠心力により流体を圧縮するものである。
遠心圧縮機１は、ケーシング２と、多段ロータ１０とを備え、多段ロータ１０は回転軸３が複数のインペラ４に回転軸３の軸線Ｏに同軸に挿通されて取り付けられている。 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view showing an outline of the overall configuration of a centrifugal compressor (rotary machine) 1 having an impeller (rotating member). The centrifugal compressor 1 uses a rotating impeller 4 to pass a fluid (gas or vapor) such as hydrogen in the radial direction of the impeller 4 and compresses the fluid by centrifugal force generated in the fluid.
The centrifugal compressor 1 includes a casing 2 and a multi-stage rotor 10, and the multi-stage rotor 10 is attached to a plurality of impellers 4 so as to be coaxially inserted into an axis O of the rotary shaft 3.

ケーシング２は、遠心圧縮機の外観形状をなすとともに、この内部に、回転軸３と、この回転軸３の軸線方向に沿って所定の間隔を有して取り付けられた複数のインペラ４と、各インペラ４間を連通して段階的に圧縮された流体を流通させる流路２ｃと、回転軸３の両端部を回転可能に支持する各軸受５とを備え、ケーシング２の壁面には、圧縮する気体を導き入れる吸入口２ａと、圧縮された気体を送出する吐出口２ｂとが設けられている。また、回転軸３は、図示しない駆動源に連結されて回転駆動するようになっている。   The casing 2 has an external shape of a centrifugal compressor, and includes a rotating shaft 3 and a plurality of impellers 4 attached at predetermined intervals along the axial direction of the rotating shaft 3. A flow path 2c that allows the compressed fluid to flow in stages by communicating between the impellers 4 and bearings 5 that rotatably support both ends of the rotating shaft 3 are provided. The wall surface of the casing 2 is compressed. A suction port 2a for introducing gas and a discharge port 2b for sending compressed gas are provided. The rotating shaft 3 is connected to a driving source (not shown) so as to be rotated.

各インペラ４は、図２に示すように、円盤上に複数の羽根（図示せず）が立設され、該羽根の先端にシュラウドが取り付けられて構成されている。上記円盤とシュラウドとの間に形成される空間は、圧縮する気体の通り道として機能する流路とされ、先に説明したケーシング２内の流路２ｃと繋げられている。   As shown in FIG. 2, each impeller 4 is configured such that a plurality of blades (not shown) are erected on a disk, and a shroud is attached to the tip of the blade. The space formed between the disk and the shroud is a flow path that functions as a passage for the gas to be compressed, and is connected to the flow path 2c in the casing 2 described above.

また、インペラ４は、軸線方向後方側（一方側）４Ａには一方側が小径とされた多段円筒状の後方側壁部４Ｂが形成されるとともに、軸線方向後方側（他方側）４Ｃには他方側が小径とされた多段円筒状の前方側壁部４Ｄが形成され、重量が大きいインペラ本体が形成される後方側４Ａのほうが遠心力の影響を大きく受けて浮き上がりやすい構成とされており、インペラ４は前方側４Ｂが焼きばめ又はクリアランスゼロにて回転軸３に取り付けられ、後方側４Ａがすき間ばめにより取り付けられている。符号Ｔで示した部分は焼ばめを、符号Ｓで示した部分はすき間ばめを示している。
なお、最も前段側のインペラ４では前方側壁部４Ｄが、最も後段側のインペラ４では後方側壁部４Ｂは必要とされていない。 Further, the impeller 4 is formed with a multi-stage cylindrical rear side wall portion 4B having a small diameter on one side in the axial rear side (one side) 4A, and on the other side in the axial rear side (the other side) 4C. The rear side 4A where the multi-stage cylindrical front side wall portion 4D having a small diameter is formed and the impeller body having a large weight is formed is more easily affected by the centrifugal force, and the impeller 4 is more easily lifted. The side 4B is attached to the rotary shaft 3 with shrink fitting or zero clearance, and the rear side 4A is attached by clearance fitting. The portion indicated by the symbol T indicates shrink fit, and the portion indicated by the symbol S indicates clearance fit.
The front side wall portion 4D is not required for the frontmost impeller 4, and the rear side wall portion 4B is not required for the rearmost impeller 4.

図３は、第１の実施形態における多段ロータ１０の概略構成を説明する図である。
前段インペラ４１と、前段インペラ４１と隣接して軸線方向後方側に配置される後段インペラ４２は、前段インペラ４１、後段インペラ４２の中央に形成された取付孔に回転軸３が挿通され、各インペラ４１、４２は回転軸３の軸線Ｏと同軸に配置されている。
前段インペラ４１は、後端部（一方側の端部）４１Ａに円筒形状の後方側壁部４１Ｂを備え、後段インペラ４２は、前端部（他方側の端部）４２Ａに円筒形状の前方側壁部４２Ｂを備えている。
また、軸線方向に隣接する前段インペラ４１と後段インペラ４２は、連結部材１１により接続されている。 FIG. 3 is a diagram illustrating a schematic configuration of the multistage rotor 10 according to the first embodiment.
The front-stage impeller 41 and the rear-stage impeller 42 disposed adjacent to the front-stage impeller 41 on the rear side in the axial direction are inserted into the mounting holes formed in the center of the front-stage impeller 41 and the rear-stage impeller 42, and each impeller is inserted. 41 and 42 are arranged coaxially with the axis O of the rotating shaft 3.
The front stage impeller 41 includes a cylindrical rear side wall part 41B at the rear end part (one side end part) 41A, and the rear stage impeller 42 has a cylindrical front side wall part 42B at the front end part (the other side end part) 42A. It has.
Further, the front-stage impeller 41 and the rear-stage impeller 42 that are adjacent in the axial direction are connected by the connecting member 11.

連結部材１１は、図３に示すように、円筒形状に形成されており、前段インペラ４１の後方側円筒壁部（一方側の端部）４１Ｂの外周面４１Ｃを把持可能とされた第１の係合部１１Ａと、後段インペラ４２の前方側円筒壁部（他方側の端部）４２Ｂの外周面４２Ｃを把持可能とされた第２の係合部１１Ｂとを備えている。   As shown in FIG. 3, the connecting member 11 is formed in a cylindrical shape, and is capable of gripping the outer peripheral surface 41 </ b> C of the rear cylindrical wall portion (one end portion) 41 </ b> B of the front impeller 41. 11 A of engaging parts and the 2nd engaging part 11B which can hold | grip the outer peripheral surface 42C of the front side cylindrical wall part (end part of the other side) 42B of the back | latter stage impeller 42 are provided.

また、連結部材１１は、インペラ４１、４２と同一の材質又は線膨張係数が小さい材料により形成され、連結部材１１によるインペラ４１，４２への締め付けが効率的に行なわれるようになっている。また、連結部材１１の第１の係合部１１Ａ及び第２の係合部１１Ｂは、後方側円筒壁部４１Ｂの外周面４１Ｃ及び前方側円筒壁部４２Ｂの外周面４２Ｃに焼きばめ又はクリアランスゼロで取り付けられている。   The connecting member 11 is formed of the same material as the impellers 41 and 42 or a material having a small linear expansion coefficient so that the impellers 41 and 42 are efficiently tightened by the connecting member 11. Further, the first engaging portion 11A and the second engaging portion 11B of the connecting member 11 are shrink-fitted or cleared on the outer peripheral surface 41C of the rear cylindrical wall portion 41B and the outer peripheral surface 42C of the front cylindrical wall portion 42B. Installed with zero.

また、連結部材１１の軸線方向の長さＬは、以下の式（１）
Ｌ＜Ａ／Ｋ ・・・式（１）
Ａ：２〜３
Ｋ＝（（３（１−（ν）２））／Ｒ２ｈ２）１／４
ν：連結部材を構成する材料のポアソン比
Ｒ：連結部材の半径（連結部材の内径＋（肉厚／２））（ｃｍ）
ｈ：連結部材の肉厚（ｃｍ）
の条件を満足するようになっており、連結部材１１が厚肉円筒である場合に、上記後端部４１Ａにおいて遠心力により生じた曲げモーメントが前端部４２Ａ作用する長さＬとされている。 Further, the length L in the axial direction of the connecting member 11 is expressed by the following formula (1).
L <A / K (1)
A: 2-3
K = ((3 (1- (ν) 2 )) / R 2 h 2 ) 1/4
ν: Poisson's ratio of the material constituting the connecting member R: radius of the connecting member (inner diameter of connecting member + (wall thickness / 2)) (cm)
h: thickness of connecting member (cm)
When the connecting member 11 is a thick cylinder, the bending moment generated by the centrifugal force at the rear end portion 41A is set to a length L at which the front end portion 42A acts.

第１の実施形態に係るインペラの取付構造によれば、前段インペラ４１の後端部４１Ａと、後段インペラ４２の前端部４２Ａが連結部材１１で連結され、前段インペラ４１の後端部４１Ａに発生する遠心力を押圧力に変換して後段インペラ４２の前端部４２Ａを押圧するので、前段インペラ４１の後端部４１Ａ及び後段インペラ４２の前端部４２Ａの浮き上がりを効率的に抑制することができる。   According to the impeller mounting structure according to the first embodiment, the rear end portion 41A of the front stage impeller 41 and the front end portion 42A of the rear stage impeller 42 are connected by the connecting member 11, and are generated at the rear end portion 41A of the front stage impeller 41. Since the centrifugal force is converted into a pressing force and the front end 42A of the rear impeller 42 is pressed, the lifting of the rear end 41A of the front impeller 41 and the front end 42A of the rear impeller 42 can be efficiently suppressed.

その結果、インペラ４が回転軸３の回転に対してすべることがなくなり、多段ロータ１０の回転速度を高めることにより各段のインペラ４による気体の圧縮率を高めることができる。また、回転停止を繰り返してもインペラ４に起因する振動を抑制することができる。
また、遠心圧縮機１によれば、例えば、水素等の圧縮が困難な気体についても、効率的かつ安定して圧縮することができる。
また、多段ロータ１０が高速で回転可能とされることにより、圧縮するために必要とされるインペラ４の段数を少なくし、又はインペラ４の外径を小さくすることができるので、遠心圧縮機及び水素圧縮機の小型化を図ることも可能となる。 As a result, the impeller 4 does not slide with respect to the rotation of the rotating shaft 3, and the gas compression rate of each stage of the impeller 4 can be increased by increasing the rotation speed of the multistage rotor 10. Further, vibration caused by the impeller 4 can be suppressed even if the rotation stop is repeated.
Further, according to the centrifugal compressor 1, for example, a gas that is difficult to compress, such as hydrogen, can be efficiently and stably compressed.
Further, since the multi-stage rotor 10 can be rotated at a high speed, the number of stages of the impeller 4 required for compression can be reduced, or the outer diameter of the impeller 4 can be reduced. It is also possible to reduce the size of the hydrogen compressor.

次に、図４を参照してこの発明の第２の実施形態について説明する。
第２の実施形態が第１の実施形態と異なるのは、多段ロータ１０における前段インペラ（第１のインペラ）４３及び後段インペラ（第２のインペラ）４４の回転軸３への取付構造が異なる点であり、他は同様であるため同一の符号を付して、その説明を省略する。 Next, a second embodiment of the present invention will be described with reference to FIG.
The second embodiment differs from the first embodiment in that the mounting structure of the front-stage impeller (first impeller) 43 and the rear-stage impeller (second impeller) 44 in the multi-stage rotor 10 to the rotary shaft 3 is different. Since the others are the same, the same reference numerals are given and the description thereof is omitted.

第２の実施形態において、図４に示すように、前段インペラ４３は後端部４３Ａの後端面４３Ｂに回転軸３の軸線Ｏを中心とし同心状に形成された複数の環状凹凸形状からなる環状凹凸係合部４３Ｃが径方向に間隔をあけて形成されている。
また、後段インペラ４４の前端部４４Ａの前端面４４Ｂには、回転軸３の軸線Ｏを中心し同心状に形成された複数の環状凹凸形状からなる環状凹凸係合部４４Ｃが径方向に間隔をあけて形成されている。 In the second embodiment, as shown in FIG. 4, the front impeller 43 is an annular shape formed of a plurality of annular concavo-convex shapes formed concentrically around the axis O of the rotation shaft 3 on the rear end surface 43B of the rear end portion 43A. The concave / convex engaging portions 43C are formed at intervals in the radial direction.
Further, on the front end surface 44B of the front end portion 44A of the rear stage impeller 44, an annular concave and convex engaging portion 44C made of a plurality of annular concave and convex shapes formed concentrically around the axis O of the rotating shaft 3 is spaced in the radial direction. Open and formed.

連結部材１２は、長さＬの円筒形状に形成され、前段インペラ４３の環状凹凸係合部４３Ｃと相補的に形成された環状の凹凸形状部からなる第１の係合部１２Ａと、後段インペラ４４の環状凹凸係合部４４Ｃと相補的に形成された環状の凹凸形状部からなる第２の係合部１２Ｂとを備えている。   The connecting member 12 is formed in a cylindrical shape having a length L, and includes a first engagement portion 12A composed of an annular concavo-convex shape portion complementary to the annular concavo-convex engagement portion 43C of the front-stage impeller 43, and a rear-stage impeller. There are provided second annular engaging portions 12B formed of an annular concave-convex shaped portion formed in a complementary manner with 44 annular concave-convex engaging portions 44C.

第２の実施形態に係る連結部材１２を適用したインペラの取付構造によれば、前段インペラ４３及び後段インペラ４４に対する連結部材１２の取付構造が二重円筒によらず単円筒であるため、加工性、組み立て性が向上する。
また、連結部材１２が回転軸３の外径と同一の内径とされるので遠心力の影響を小さくすることができ、また、連結部材１２の肉厚が大きく確保されるので剛性を高めて効率的にインペラの浮き上がりを抑制することができる。 According to the impeller mounting structure to which the connecting member 12 according to the second embodiment is applied, the mounting structure of the connecting member 12 to the front impeller 43 and the rear impeller 44 is a single cylinder, not a double cylinder. Assemblability is improved.
Further, since the connecting member 12 has the same inner diameter as the outer diameter of the rotating shaft 3, the influence of centrifugal force can be reduced, and the thickness of the connecting member 12 is ensured to be large, so that the rigidity is increased and the efficiency is increased. In particular, the impeller can be prevented from rising.

次に、図５を参照してこの発明の第３の実施形態について説明する。
第３の実施形態が第１の実施形態と異なるのは、多段ロータ１０に関して回転軸３への前段インペラ（第１のインペラ）４５及び後段インペラ（第２のインペラ）４６の取付構造が異なる点であり、他は同様であるため同一の符号を付して、その説明を省略する。 Next, a third embodiment of the present invention will be described with reference to FIG.
The third embodiment differs from the first embodiment in that the mounting structure of the front-stage impeller (first impeller) 45 and the rear-stage impeller (second impeller) 46 to the rotary shaft 3 is different with respect to the multistage rotor 10. Since the others are the same, the same reference numerals are given and the description thereof is omitted.

第３の実施形態において、前段インペラ４５は後端部４５Ａには軸線方向後方側が漸次縮径されるテーパ状の後方側壁部４５Ｂが形成され、後段インペラ４６の前端部４６Ａには軸線方向前方側が漸次縮径されるテーパ状の前方側壁部４６Ｂが形成されている。
連結部材１３は、図５に示すように、上記式（１）を満足する一定の長さＬとされ、後方側壁部４５Ｂの外周面４５Ｃ及び前方側壁部４６Ｂの外周面４６Ｃと相補的に形成された連結部材１３の両端側に拡径する第１のテーパ形状部（第１の係合部）１３Ａと、第２のテーパ形状部（第２の係合部）１３Ｂとを備えている。
第３の実施形態に係る連結部材１３を適用したインペラ４の取付構造によれば、内周径が回転軸３の外周径と同一とされるとともに、クサビ効果により後端部４５Ａの変位が小さな段階で、前端部４６Ａを押圧して、前段インペラ４５の後端部４５Ａ及び後段インペラ４６の前端部４６Ａの浮き上がりを抑制することができる。 In the third embodiment, the front impeller 45 has a rear end 45A formed with a tapered rear side wall 45B whose diameter is gradually reduced on the rear side in the axial direction, and the front end 46A of the rear impeller 46 has an axial front side on the front end 46A. A tapered front side wall portion 46B that is gradually reduced in diameter is formed.
As shown in FIG. 5, the connecting member 13 has a constant length L that satisfies the above formula (1), and is formed in a complementary manner with the outer peripheral surface 45C of the rear side wall 45B and the outer peripheral surface 46C of the front side wall 46B. The connecting member 13 includes a first tapered portion (first engaging portion) 13A and a second tapered portion (second engaging portion) 13B.
According to the mounting structure of the impeller 4 to which the connecting member 13 according to the third embodiment is applied, the inner peripheral diameter is the same as the outer peripheral diameter of the rotary shaft 3, and the displacement of the rear end portion 45A is small due to the wedge effect. In the stage, the front end portion 46A can be pressed to prevent the rear end portion 45A of the front stage impeller 45 and the front end portion 46A of the rear stage impeller 46 from being lifted.

次に、図６を参照してこの発明の第４の実施形態について説明する。
第４の実施形態が第１の実施形態と異なるのは、図６で示した連結部材１４が、前段インペラの後方側壁部の外周面と係合する第１の係合部１４Ａと、後段インペラの前方側壁部の外周面と係合する第２の係合部１４Ｂとを備え、連結部材１４の両端から長さ方向の中央側に伸びる凹形状部１４Ｃ、１４Ｄが周方向に間隔をあけて形成されている点である。
また、連結部材１４の長さについての式（１）の適用に関しては、例えば、実験又はシミュレーションで求めることが好適である。 Next, a fourth embodiment of the present invention will be described with reference to FIG.
The fourth embodiment is different from the first embodiment in that the connecting member 14 shown in FIG. 6 has a first engaging portion 14A that engages with the outer peripheral surface of the rear side wall portion of the front impeller, and the rear impeller. And a second engaging portion 14B that engages with the outer peripheral surface of the front side wall portion, and concave portions 14C and 14D that extend from both ends of the connecting member 14 toward the center in the length direction are spaced apart in the circumferential direction. It is a point that is formed.
Moreover, it is suitable to obtain | require by experiment or simulation regarding application of Formula (1) about the length of the connection member 14, for example.

第４の実施形態に係る連結部材１４を用いたインペラの取付構造によれば、前段インペラの後端部及び後段インペラの前端部に径方向外方に突出する凸形状部等が形成されている場合においても、連結部材１４を用いて上記インペラの取付構造を構成することができる。   According to the impeller mounting structure using the connecting member 14 according to the fourth embodiment, the rear end portion of the front impeller and the convex portion that protrudes radially outward are formed at the front end portion of the rear impeller. Even in such a case, the mounting structure of the impeller can be configured using the connecting member 14.

なお、この発明は上記実施の形態に限定されるものではなく、発明の趣旨を逸脱しない範囲において、種々の変更をすることが可能である。
例えば、上記実施の形態においては、回転部材がインペラ４とされ、このインペラ４が遠心圧縮機１に適用される場合について説明したが、インペラ以外の回転部材に適用してもよいし、インペラ４に適用する場合においても、ジェットエンジン、タービン、液化水素を生成する生成プラントに用いる冷却用の冷凍機等、他の回転機械に適用可能であることはいうまでもない。 Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, in the above embodiment, the case where the rotating member is the impeller 4 and the impeller 4 is applied to the centrifugal compressor 1 has been described. However, the impeller 4 may be applied to a rotating member other than the impeller. Needless to say, the present invention can also be applied to other rotating machines such as a cooling refrigerator used in a production plant for generating liquefied hydrogen, a jet engine, a turbine, and the like.

また、上記実施の形態においては、前段インペラ４１、４３、４５の後端部４１Ａ、４３Ａ、４５Ａが、後段インペラ４２、４４、４６の前端部４２Ａ、４４Ａ、４６Ａよりも遠心力による影響を大きく受ける場合について説明したが、後段インペラ４２、４４、４６の前端部４２Ａ、４４Ａ、４６Ａが、前段インペラ４１、４３、４５の後端部４１Ａ、４３Ａ、４５Ａがより大きな遠心力を受ける場合にも適用可能である。   Further, in the above embodiment, the rear end portions 41A, 43A, 45A of the front stage impellers 41, 43, 45 are more affected by the centrifugal force than the front end portions 42A, 44A, 46A of the rear stage impellers 42, 44, 46. Although the case where it receives is explained, the front end parts 42A, 44A, 46A of the rear stage impellers 42, 44, 46 are also used when the rear end parts 41A, 43A, 45A of the front stage impellers 41, 43, 45 receive a larger centrifugal force. Applicable.

また、隣接する回転部材のうち相対的に遠心力の影響を大きく受ける端部は、軸線方向における一方向（一方側又は他方側のいずれか）に限定されることなく、隣接する回転部材のうち遠心力の影響をより大きく受ける端部が軸線方向の一方側又は他方側であるかは自在に設定可能であり、また、ひとつの回転機械に中に軸線方向の一方側及び他方側の双方の組み合わせがあり、又はそれらがランダムに配置されてもよい。   Moreover, the edge part which receives the influence of centrifugal force relatively greatly among adjacent rotating members is not limited to one direction (either one side or the other side) in the axial direction. It is possible to freely set whether the end portion that is more greatly affected by the centrifugal force is on one side or the other side in the axial direction. In addition, both ends on one side and the other side in the axial direction can be inserted into one rotating machine. There are combinations or they may be randomly arranged.

また、上記実施の形態においては、連結部材１１、１２、１３、１４の一端部と他端部とが同一形状である場合について説明したが、インペラ４の前端部と後端部、及び連結部材１１、１２、１３、１４の第１の係合部１１Ａ、１２Ａ、１３Ａ、１４Ａと第２の係合部１１Ｂ、１２Ｂ、１３Ｂ、１４Ｂの係合形状については任意に組み合わせることが可能である。
また、式（１）の条件を満足するかどうかは遠心力の大きさとの関わりにより任意に設定可能な事項であるし、上記実施形態でしました形状以外の係合部を用いてもよいことは当然である。 Moreover, in the said embodiment, although the case where the one end part and other end part of the connection members 11, 12, 13, and 14 were the same shape was demonstrated, the front-end part and rear-end part of the impeller 4, and a connection member The engaging shapes of the first engaging portions 11A, 12A, 13A, 14A of 11, 12, 13, 14 and the second engaging portions 11B, 12B, 13B, 14B can be arbitrarily combined.
Whether or not the condition of the expression (1) is satisfied is a matter that can be arbitrarily set depending on the relationship with the magnitude of the centrifugal force, and an engaging portion other than the shape described in the above embodiment may be used. Is natural.

。本発明の一実施形態における遠心圧縮機または遠心圧縮機の概略構成を説明する縦断面図である。. It is a longitudinal section explaining a schematic structure of a centrifugal compressor or a centrifugal compressor in one embodiment of the present invention. 本発明の一実施形態に係るインペラの概略説明する断面図である。1 is a cross-sectional view schematically illustrating an impeller according to an embodiment of the present invention. 本発明の第１の実施形態に係る多段ロータの概略構成を説明する断面図である。It is sectional drawing explaining schematic structure of the multistage rotor which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係る多段ロータの概略構成を説明する断面図である。It is sectional drawing explaining schematic structure of the multistage rotor which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る多段ロータの概略構成を説明する断面図である。It is sectional drawing explaining schematic structure of the multistage rotor which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施形態に係る連結部材を説明する斜視図である。It is a perspective view explaining the connection member which concerns on the 4th Embodiment of this invention.

符号の説明Explanation of symbols

Ｏ 軸線
１ 遠心圧縮機（回転機械）
３ 回転軸
４ インペラ（回転部材）
４Ｂ 後方側壁部（一方側の壁部）
４Ｄ 前方側壁部（他方側の壁部）
１１、１２、１３、１４ 連結部材
１１Ａ、１２Ａ、１３Ａ、１４Ａ 第１の係合部
１１Ｂ、１２Ｂ、１３Ｂ、１４Ｂ 第２の係合部
４１、４３、４５ 前段インペラ（第１の回転部材）
４２、４４、４６ 後段インペラ（第２の回転部材）
４１Ａ、４３Ａ、４５Ａ 後端部（一方側の端部）
４２Ａ、４４Ａ、４６Ａ 前端部（他方側の端部）
４１Ｂ、４５Ｂ 後方側壁部（一方側の壁部）
４２Ｂ，４６Ｂ 前方側壁部（他方側の壁部）
４１Ｃ、４５Ｃ 外周面（一方側の外周面）
４２Ｃ，４６Ｃ 外周面（他方側の外周面）
４３Ｂ 後端面（一方側の端面）
４４Ｂ 前端面（他方側の端面） O Axis 1 Centrifugal compressor (rotary machine)
3 Rotating shaft 4 Impeller (Rotating member)
4B Rear side wall (one side wall)
4D Front side wall (the other side wall)
11, 12, 13, 14 Connecting member 11A, 12A, 13A, 14A First engaging portion 11B, 12B, 13B, 14B Second engaging portion 41, 43, 45 Pre-stage impeller (first rotating member)
42, 44, 46 Rear impeller (second rotating member)
41A, 43A, 45A Rear end (end on one side)
42A, 44A, 46A Front end (the other end)
41B, 45B Rear side wall (one side wall)
42B, 46B front side wall (wall on the other side)
41C, 45C outer peripheral surface (one outer peripheral surface)
42C, 46C outer peripheral surface (the other outer peripheral surface)
43B Rear end face (one end face)
44B Front end face (the other end face)

Claims (5)

回転軸が挿通されて該回転軸の軸線方向に複数の回転部材が同軸上に取り付けられる回転機械において前記回転部材を前記回転軸に取り付ける回転部材の取付構造であって、
第１の回転部材の前記軸線方向一方側の端部と、前記第１の回転部材に隣接する第２の回転部材の前記軸線方向他方側の端部とが、連結部材により接続され、
前記連結部材は、
前記一方側の端部と係合する第１の係合部と、前記他方側の端部と係合する第２の係合部とを備え、
前記一方側の端部と前記他方側の端部のいずれか一方に発生する径方向外方への力を、他方の径方向内方への力に変換可能に構成されていることを特徴とする回転部材の取付構造。 In a rotating machine in which a rotating shaft is inserted and a plurality of rotating members are coaxially mounted in the axial direction of the rotating shaft, the rotating member is attached to the rotating shaft.
An end portion on the one axial direction side of the first rotating member and an end portion on the other axial side side of the second rotating member adjacent to the first rotating member are connected by a connecting member,
The connecting member is
A first engagement portion that engages with the one end portion; and a second engagement portion that engages with the other end portion;
It is configured such that a radially outward force generated at one of the one end and the other end can be converted into the other radially inward force. A rotating member mounting structure. 請求項1に記載の回転部材の取付構造であって、
前記連結部材の前記軸線方向の長さＬは、
Ｌ＜Ａ／Ｋ
Ａ：２〜３
Ｋ＝（（３（１−（ν）２））／Ｒ２ｈ２）１／４
ν：連結部材を構成する材料のポアソン比
Ｒ：連結部材の半径（連結部材の内径＋（肉厚／２））（ｃｍ）
ｈ：連結部材の肉厚（ｃｍ）
であることを特徴とする回転部材の取付構造。 The rotating member mounting structure according to claim 1,
The length L of the connecting member in the axial direction is:
L <A / K
A: 2-3
K = ((3 (1- (ν) 2 )) / R 2 h 2 ) 1/4
ν: Poisson's ratio of the material constituting the connecting member R: radius of the connecting member (inner diameter of connecting member + (wall thickness / 2)) (cm)
h: thickness of connecting member (cm)
A mounting structure for a rotating member, wherein 請求項1又は請求項２に記載の回転部材の取付構造であって、
前記第１の係合部は、
前記一方側の端部を、外周面にて把持する壁部又は端面にて把持する凹凸形状部の少なくともいずれか一方からなり、
前記第２の係合部は、
前記他方側の端部を、外周面にて把持する壁部又は端面にて把持する凹凸形状部の少なくともいずれか一方からなることを特徴とする回転部材の取付構造。 The rotating member mounting structure according to claim 1 or 2,
The first engaging portion is
The one end is composed of at least one of a wall portion gripped by the outer peripheral surface or an uneven shape portion gripped by the end surface,
The second engaging portion is
The rotating member mounting structure is characterized by comprising at least one of a wall portion gripped by the outer peripheral surface and an uneven shape portion gripped by the end surface. 請求項1から請求項３のいずれか１項に記載の回転部材の取付構造を備えることを特徴とする回転機械。   A rotating machine comprising the rotating member mounting structure according to any one of claims 1 to 3. 前記回転部材がインペラとされ、請求項1から請求項３のいずれか１項に記載の回転部材の取付構造を備えることを特徴とする遠心圧縮機。   A centrifugal compressor comprising the rotating member mounting structure according to any one of claims 1 to 3, wherein the rotating member is an impeller.
JP2008074486A 2008-03-21 2008-03-21 Rotary member installing structure, rotary machine and centrifugal compressor Pending JP2009228774A (en)

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US9951627B2 (en) 2012-02-13 2018-04-24 Mitsubishi Heavy Industries Compressor Corporation Impeller and rotating machine provided with same
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US11041504B2 (en) 2015-12-03 2021-06-22 Mitsubishi Heavy Industries Compressor Corporation Rotor of centrifugal compressor, centrifugal compressor, and method for manufacturing rotor of centrifugal compressor
CN113474971A (en) * 2019-02-25 2021-10-01 西门子股份公司 Complex annular element with connecting elements applied in an additive method
CN113474971B (en) * 2019-02-25 2024-05-14 西门子股份公司 Complex ring element with connecting elements applied in additive manner

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