JP3730298B2 - Gas bearing supported expansion turbine - Google Patents

Gas bearing supported expansion turbine Download PDF

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Publication number
JP3730298B2
JP3730298B2 JP00577396A JP577396A JP3730298B2 JP 3730298 B2 JP3730298 B2 JP 3730298B2 JP 00577396 A JP00577396 A JP 00577396A JP 577396 A JP577396 A JP 577396A JP 3730298 B2 JP3730298 B2 JP 3730298B2
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JP
Japan
Prior art keywords
blower
turbine
gas bearing
expansion turbine
bearing
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
Application number
JP00577396A
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Japanese (ja)
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JPH09195984A (en
Inventor
善裕 仲山
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Kobe Steel Ltd
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Kobe Steel Ltd
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Filing date
Publication date
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Priority to JP00577396A priority Critical patent/JP3730298B2/en
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Description

【０００１】
【発明の属する技術分野】
本発明は、ヘリウム冷凍機、空気分離装置等に適用される気体軸受支持形膨張タービンに関するものである。
【０００２】
【従来の技術】
図２は、従来より用いられている気体軸受支持形膨張タービンの本体断面説明図である。この図により従来の気体軸受支持形膨張タービンを説明する。
【０００３】
図中、１は軸受箱、２はタービンインペラ、３はブロワインペラ、４はスラスト気体軸受、５はジャーナル軸受、６はロータを示す。この図示の膨張タービンでは、高圧のタービン入口流路７内のガスを、タービンインペラ２で膨張、低圧としてタービン出口流路８に排気する一方、タービンインペラ２と相対しロータ６の他端には回転を制動するブロワインペラ３が設けられており、このブロワインペラ３側ではブロワ入口流路９から吸引したガスをブロワ出口ディフューザ部10に昇圧、排気する。
【０００４】
【発明が解決しようとする課題】
ところで、上記従来の気体軸受支持形膨張タービンにおいては、タービンインペラ２側ではノズル13を通過したガスの静圧がタービンインペラ背板部11の背面と軸受箱１のタービン側サイドプレート14の間に張り込み、タービン出口流路８との圧力差で図４の下向きにスラスト力を発生する。一方、ブロワインペラ３側ではブロワインペラ３を通過したガスの静圧がブロワインペラ背板部12の背面と軸受箱１のブロワ側サイドプレート15の間に張り込み、ブロワ入口流路９との圧力差で図４の上向きにスラスト力を発生する。従って、一般に低圧力比のブロワに対しタービン側の前記スラスト力は大きく、結果としてロータ６は下向きにスラスト力を受け、油軸受等に比べ極めて負荷能力の小さいスラスト気体軸受４の下部がスラスト力を支持しきれずに焼損する問題があった。
【０００５】
本発明は、上記の問題点を改善すべくなしたものであって、その目的は、スラスト気体軸受が上下方向のスラスト力をバランス良く支持し得る気体軸受支持形膨張タービンを提供するものである。
【０００６】
【課題を解決するための手段】
上記の目的を達成するため、本発明に係る気体軸受支持形膨張タービンの〔請求項１〕のものは、ロータの一端にタービンインペラ、他端にブロワインペラを備えるとともに、スラスト気体軸受を備える気体軸受支持形膨張タービンにおいて、ブロワディフューザ部にブロワインペラ背板部に指向する流れを形成するバケットを配設したものである。
【０００９】
従来の気体軸受支持形膨張タービンにおいてスラスト気体軸受が焼損する理由は、タービン側で発生する下向きスラスト力がブロワ側で発生する上向きスラスト力よりも大きくなるためである。ブロワ側で発生する上向きスラスト力が小さいのは、ブロワ側で上向きスラスト力を発生させるブロワインペラ背板部の背面に張り込む圧力がブロワインペラ直後の静圧であるためで、ブロワインペラ直後ではブロワで昇圧される圧力（全圧）は静圧と流速分（動圧）とを持っているが、流速が大きい（動圧分が大きい）ためブロワインペラ背板部の背面に回り込む静圧分が小さなものとなる。そこで、上述した本発明では、ブロワ直後で持っている動圧分をブロワ出口のディフューザで十分静圧に回復させた後の大きな静圧をブロワインペラ背板部の背面に導くように構成し、これにより、ブロワ側で発生する上向きスラスト力を大きくし、結果としてスラスト軸受が支持すべき下向きスラスト力の低減を図るものである。
【００１０】
【発明の実施の形態】
以下、本発明の実施形態を図面を参照して説明する。なお、従来技術と同構成のものは同じ符号を以て示す。
【００１１】
図１は、本発明に係る気体軸受支持形膨張タービンのロータ軸受部を主体とした断面説明図であって、図において１は軸受箱、２はタービンインペラ、３はブロワインペラ、４はスラスト気体軸受、５はジャーナル軸受、６はロータを示す。
【００１２】
この図に示す膨張タービンは、ロータ６をスラスト気体軸受４及びジャーナル軸受５により支持されるとともに、下端にタービンインペラ２が、上端にブロワインペラ３が取付けられ、タービン側では、高圧のタービン入口流路７内のガスをタービンインペラ２で膨張、低圧としてタービン出口流路８に排気する。またブロワ側では、ブロワ入口流路９から吸引したガスをブロワ出口ディフューザ部10に昇圧、排気するように構成されている。この気体軸受け支持形膨張タービンは、ブロワディフューザ部 10 のブロワ側サイドプレート 15 表面にブロワインペラ背板部 12 の背面に指向する流れを形成するバケット 19 を配設している。
【００１７】
上記構成の気体軸受支持形膨張タービンにおいては、運転中、タービン側では、高圧のタービン入口流路７内のガスをタービンインペラ２で膨張、低圧としてタービン出口流路８に排気し、その過程でノズル 13 を通過したガスの静圧がタービンインペラ背板部 11 の背面に張り込み、タービン出口流路８との圧力差で下向きにスラスト力を発生するが、ブロワインペラ３で昇圧された気体流れの一部はバケット19に衝突して流速分（動圧分）を静圧に加えた形でブロワインペラ背板部12の背面に指向する流れとなるので、その大きな圧力がブロワインペラ背板部12の背面に張り込み、ブロワ入口流路９との圧力差で、前記タービン側で発生する下向きのスラスト力に見合う大きさの上向きのスラスト力が発生し、この上向きのスラスト力によってスラスト気体軸受４のスラストカラー4aがバランス良く支持され焼損が防止される。
【００１８】
【発明の効果】
以上説明したように、本発明に係る気体軸受支持形膨張タービンによれば、ロータに加わるタービン側で発生する下向きのスラスト力をブロワ側で発生する上向きのスラスト力によって低減することができ、スラスト気体軸受によって上下方向のスラストをバランスして支持することができ焼損が防止される。
【図面の簡単な説明】
【図１】本発明に係る気体軸受支持形膨張タービンのロータ軸受部を主体とした断面説明図である。
【図２】従来の気体軸受支持形膨張タービンのロータ軸受部を主体とした断面説明図である。
【符号の説明】
１：軸受箱 ２：タービンインペラ ３：ブロワインペラ
４：スラスト気体軸受 4a：スラストカラー ５：ジャーナル軸受
６：ロータ ７：タービン入口流路 ８：タービン出口流路
９：ブロワ入口流路 10：ブロワ出口ディフューザ部
11：タービンインペラ背板部 12：ブロワインペラ背板部
13：ノズル 14：タービン側サイドプレート
15：ブロワ側サイドプレート 16：出口部
17：流路 17a ：入口 18：延長背板部
19：バケット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas bearing supported expansion turbine applied to a helium refrigerator, an air separation device, and the like.
[0002]
[Prior art]
FIG. 2 is a cross-sectional explanatory view of a main body of a conventional gas bearing supported expansion turbine. A conventional gas bearing supported expansion turbine will be described with reference to FIG.
[0003]
In the figure, 1 is a bearing box, 2 is a turbine impeller, 3 is a blower impeller, 4 is a thrust gas bearing, 5 is a journal bearing, and 6 is a rotor. In the illustrated expansion turbine, the gas in the high-pressure turbine inlet passage 7 is expanded by the turbine impeller 2 and discharged to the turbine outlet passage 8 as a low pressure, while facing the turbine impeller 2 at the other end of the rotor 6. A blower blade 3 for braking the rotation is provided. On the blower blade 3 side, the gas sucked from the blower inlet channel 9 is pressurized and exhausted to the blower outlet diffuser section 10.
[0004]
[Problems to be solved by the invention]
By the way, in the conventional gas bearing supported expansion turbine, the static pressure of the gas that has passed through the nozzle 13 on the turbine impeller 2 side is between the rear surface of the turbine impeller back plate portion 11 and the turbine side plate 14 of the bearing box 1. A thrust force is generated in the downward direction of FIG. On the other hand, the static pressure of the gas that has passed through the blower propeller 3 sticks between the back surface of the back plate portion 12 of the blower propeller 12 and the blower side plate 15 of the bearing box 1 on the blower propeller 3 side. Thus, a thrust force is generated upward in FIG. Accordingly, the thrust force on the turbine side is generally larger than that of the blower having a low pressure ratio. As a result, the rotor 6 receives a thrust force downward, and the lower portion of the thrust gas bearing 4 having a very small load capacity compared to an oil bearing or the like is located at the lower portion. There was a problem of burning without being able to support.
[0005]
The present invention has been made to improve the above-mentioned problems, and an object of the present invention is to provide a gas bearing-supported expansion turbine in which a thrust gas bearing can support a thrust force in the vertical direction in a well-balanced manner. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the gas bearing supported expansion turbine according to the present invention has a turbine impeller at one end of the rotor and a blower impeller at the other end and a gas having a thrust gas bearing. In the bearing-supported expansion turbine, a bucket that forms a flow directed to the back plate portion of the blower blade is disposed in the blower diffuser portion.
[0009]
The reason why the thrust gas bearing burns down in the conventional gas bearing supported expansion turbine is that the downward thrust force generated on the turbine side is larger than the upward thrust force generated on the blower side. The upward thrust force generated on the blower side is small because the pressure applied to the back of the blower blade back plate that generates the upward thrust force on the blower side is the static pressure immediately after the blower impeller. The pressure (total pressure) increased by the pressure has both static pressure and flow velocity (dynamic pressure), but since the flow velocity is large (dynamic pressure component is large), the static pressure flowing around the back of the back plate of the blow wine perimeter It will be small. Therefore, in the present invention described above, the configuration is such that a large static pressure after the dynamic pressure component immediately after the blower is restored to a sufficient static pressure by the diffuser at the blower outlet is guided to the back surface of the back plate portion of the blower perimeter, As a result, the upward thrust force generated on the blower side is increased, and as a result, the downward thrust force to be supported by the thrust bearing is reduced.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art is shown with the same code | symbol.
[0011]
FIG. 1 is a cross-sectional explanatory view mainly showing a rotor bearing portion of a gas bearing-supported expansion turbine according to the present invention, in which 1 is a bearing box, 2 is a turbine impeller, 3 is a blower impeller, and 4 is a thrust gas. Bearings 5 are journal bearings, and 6 is a rotor.
[0012]
In the expansion turbine shown in this figure, a rotor 6 is supported by a thrust gas bearing 4 and a journal bearing 5, a turbine impeller 2 is attached to the lower end, and a blower impeller 3 is attached to the upper end. The gas in the passage 7 is expanded by the turbine impeller 2 and discharged to the turbine outlet passage 8 as a low pressure. On the blower side, the gas sucked from the blower inlet channel 9 is pressurized and exhausted to the blower outlet diffuser section 10. In this gas bearing supported expansion turbine, a bucket 19 is provided on the surface of the blower side plate 15 of the blower diffuser portion 10 to form a flow directed to the back surface of the blower blade back plate portion 12 .
[0017]
In the gas bearing supported expansion turbine having the above-described configuration, during operation, on the turbine side, the gas in the high-pressure turbine inlet passage 7 is expanded by the turbine impeller 2 and discharged to the turbine outlet passage 8 as a low pressure. The static pressure of the gas that has passed through the nozzle 13 sticks to the back surface of the turbine impeller back plate 11 and generates a thrust force downward due to the pressure difference with the turbine outlet flow path 8 . A part of the flow collides with the bucket 19 and the flow velocity component (dynamic pressure component) is added to the static pressure to flow toward the back surface of the blower blade back plate portion 12, so the large pressure is applied to the blow wine blade back plate portion 12. imposition on the back of a pressure differential between the blower inlet channel 9, the upward thrust force having a magnitude commensurate with the thrust force downwardly generated in the turbine side is generated, the scan by the thrust force of the upward The thrust collar 4a of the last gas bearing 4 is supported in a well-balanced manner to prevent burning.
[0018]
【The invention's effect】
As described above, according to the gas bearing-supported expansion turbine of the present invention, the downward thrust force generated on the turbine side applied to the rotor can be reduced by the upward thrust force generated on the blower side. The gas bearing can balance and support the thrust in the vertical direction and prevent burning.
[Brief description of the drawings]
FIG. 1 is an explanatory cross-sectional view mainly showing a rotor bearing portion of a gas bearing supported expansion turbine according to the present invention.
FIG. 2 is an explanatory cross-sectional view mainly showing a rotor bearing portion of a conventional gas bearing supported expansion turbine.
[Explanation of symbols]
1: Bearing housing 2: Turbine impeller 3: Blow winder 4: Thrust gas bearing 4a: Thrust collar 5: Journal bearing 6: Rotor 7: Turbine inlet channel 8: Turbine outlet channel 9: Blower inlet channel 10: Blower outlet Diffuser section
11: Turbine impeller back plate 12: Blow wine impeller back plate
13: Nozzle 14: Turbine side plate
15: Blower side plate 16: Exit
17: Channel 17a: Entrance 18: Extension back plate
19: Bucket

Claims (1)

ロータの一端にタービンインペラ、他端にブロワインペラを備えるとともに、スラスト気体軸受を備える気体軸受支持形膨張タービンにおいて、ブロワディフューザ部にブロワインペラ背板部に指向する流れを形成するバケットを配設したことを特徴とする気体軸受支持形膨張タービン。Distribution turbine impeller on one end of the rotor, provided with a blower impeller to the other end, in the gas bearing-supporting the expansion turbine with a thrust gas bearing, a bucket to form a flow directed to the blower impeller back plate portion to the blower di fuser unit A gas bearing supported expansion turbine characterized by being provided.
JP00577396A 1996-01-17 1996-01-17 Gas bearing supported expansion turbine Expired - Lifetime JP3730298B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP00577396A JP3730298B2 (en) 1996-01-17 1996-01-17 Gas bearing supported expansion turbine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00577396A JP3730298B2 (en) 1996-01-17 1996-01-17 Gas bearing supported expansion turbine

Publications (2)

Publication Number Publication Date
JPH09195984A JPH09195984A (en) 1997-07-29
JP3730298B2 true JP3730298B2 (en) 2005-12-21

Family

ID=11620447

Family Applications (1)

Application Number Title Priority Date Filing Date
JP00577396A Expired - Lifetime JP3730298B2 (en) 1996-01-17 1996-01-17 Gas bearing supported expansion turbine

Country Status (1)

Country Link
JP (1) JP3730298B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5031012B2 (en) * 2006-07-13 2012-09-19 三菱重工業株式会社 Compressor and operation control method thereof
JP2011122516A (en) * 2009-12-10 2011-06-23 Mitsubishi Heavy Ind Ltd Centrifugal compressor
CN104879302A (en) * 2015-04-15 2015-09-02 安徽三联泵业股份有限公司 Centrifugal pump for pipeline delivery

Also Published As

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