JPH11107997A - Stall avoiding method of multistage compressor and device therefor - Google Patents
Stall avoiding method of multistage compressor and device thereforInfo
- Publication number
- JPH11107997A JPH11107997A JP27156297A JP27156297A JPH11107997A JP H11107997 A JPH11107997 A JP H11107997A JP 27156297 A JP27156297 A JP 27156297A JP 27156297 A JP27156297 A JP 27156297A JP H11107997 A JPH11107997 A JP H11107997A
- Authority
- JP
- Japan
- Prior art keywords
- stage
- air
- casing
- stall
- ejector
- 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.)
- Pending
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、多段圧縮機に係
り、特に多段圧縮機で発生するストールを回避する多段
圧縮機のストール回避方法及びその装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage compressor, and more particularly, to a stall avoiding method for a multi-stage compressor for avoiding a stall generated in the multi-stage compressor, and an apparatus therefor.
【０００２】[0002]
【従来の技術】圧縮機は、空気流量を絞っていくと圧力
上昇のピーク近傍で圧縮機全体がストール（以下全体ス
トールという）という非定状現象を起こし、著しい作動
効率の低下を起こす。2. Description of the Related Art In a compressor, when the air flow rate is reduced, the whole compressor suffers an unsteady phenomenon called a stall (hereinafter referred to as a whole stall) near a peak of a pressure rise, and causes a remarkable decrease in operating efficiency.
【０００３】このため、従来の圧縮機は全体ストール発
生点から十分離れた点で運転し、性能を十分生かしきれ
ていない。[0003] For this reason, the conventional compressor is operated at a point sufficiently distant from the point at which the entire stall occurs, and its performance is not fully utilized.
【０００４】全体ストールの前にロータ翼端より発生、
進展するパートスパン・ローティングストール（以下Ｐ
スパントールという）が先行することが知られている。[0004] Generated from the rotor blade tip before the entire stall,
Evolving part-span / rotating stall (P
Is known to precede it.
【０００５】この部位に、高速ジェットを吹き付けて、
Ｐスパントールの萌芽を吹き飛ばすことが提案されてい
る。これにより、Ｐスパントールの発生を遅らせて全体
スパントールを抑制する有効な一つの手段である。[0005] A high-speed jet is sprayed on this part,
It has been proposed to blow off the sprouting of P-spanitol. This is one effective means of delaying the occurrence of P spantol and suppressing the entire spantole.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、高速ジ
ェットは、圧縮機の後段の抽気により供給することにな
るので、効率低下を防ぐためには抽気量は極力抑えるの
が望ましいが、抽気量が少ないと全体ストールを抑制す
ることは難しい問題がある。However, since the high-speed jet is supplied by bleeding at the subsequent stage of the compressor, it is desirable to suppress the bleeding amount as much as possible in order to prevent a decrease in efficiency. It is difficult to control the overall stall.
【０００７】そこで、本発明の目的は、上記課題を解決
し、多段圧縮機のストールを効率よく回避できる多段圧
縮機のストール回避方法及びその装置を提供することに
ある。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a method and an apparatus for avoiding a stall of a multi-stage compressor, which can efficiently avoid a stall of the multi-stage compressor.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に請求項１の発明は、多段圧縮機で発生するストールを
回避する方法において、ケーシングの後段の圧縮空気を
抽気してイジェクタに流し、そのイジェクタで生じた吸
引流でケーシングの中間段の空気を吸引して抽気と共に
ケーシングの前段に流すようにした多段圧縮機のストー
ル回避方法である。According to a first aspect of the present invention, there is provided a method of avoiding a stall generated in a multi-stage compressor, wherein compressed air at a later stage of a casing is extracted and flowed to an ejector. This is a method of avoiding stall in a multi-stage compressor in which air in an intermediate stage of a casing is sucked by a suction flow generated by the ejector and is flown to a preceding stage of the casing together with bleed air.
【０００９】請求項２の発明は、圧縮機のケーシングの
後段と前段をバイパス通路で接続すると共にそのバイパ
ス通路にイジェクタを接続し、そのイジェクタの吸込口
とケーシングの中間段とを連通させた多段圧縮機のスト
ール回避装置である。According to a second aspect of the present invention, the rear stage and the front stage of the casing of the compressor are connected by a bypass passage and an ejector is connected to the bypass passage, and a suction port of the ejector communicates with an intermediate stage of the casing. This is a compressor stall avoidance device.
【００１０】請求項３の発明は、イジェクタの上流側の
バイパス通路に開閉弁を接続し、イジェクタの吸込口と
中間段を結ぶ連通路に開閉弁の作動で開閉する作動弁を
接続した請求項２記載の多段圧縮機のストール回避装置
である。According to a third aspect of the present invention, an on-off valve is connected to the bypass passage on the upstream side of the ejector, and an operating valve which is opened and closed by the operation of the on-off valve is connected to a communication passage connecting the suction port of the ejector and the intermediate stage. 2. A stall avoidance device for a multi-stage compressor according to 2.
【００１１】[0011]
【発明の実施の形態】以下、本発明の好適一実施の形態
を添付図面に基づいて詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.
【００１２】図１において、多段圧縮機１０は、ケーシ
ング１１内に回転自在に支承された回転軸１２に多段に
動翼となる羽根車１３が取り付けられて構成され、前段
１４からの空気を順次羽根車１３と静翼（図示せず）で
圧縮し、後段１５から吐出するようになっている。Referring to FIG. 1, a multi-stage compressor 10 is configured by mounting an impeller 13 serving as a moving blade in multiple stages on a rotating shaft 12 rotatably supported in a casing 11, and sequentially supplying air from a front stage 14. Compressed by an impeller 13 and a stationary blade (not shown), and discharged from the rear stage 15.
【００１３】さて、ケーシング１１の後段１５には、圧
縮空気を抽気して前段１４に戻すバイパス通路１６が接
続される。A bypass passage 16 is connected to the rear stage 15 of the casing 11 to extract compressed air and return the compressed air to the front stage 14.
【００１４】このバイパス通路１６には、開閉弁１７を
介してイジェクタ１８が接続され、その前段１４には、
後段１５側に向けて空気を噴射するノズル１９が設けら
れる。このノズル１９は、ケーシング１１の円周方向に
複数個設けられる。An ejector 18 is connected to the bypass passage 16 via an on-off valve 17.
A nozzle 19 for injecting air toward the rear stage 15 is provided. The plurality of nozzles 19 are provided in the circumferential direction of the casing 11.
【００１５】イジェクタ１８は、バイパス通路１６を通
る圧縮空気で吸引流を生じ、その吸込口２０とケーシン
グ１１の中段２１とを結んで連通路２２が設けられ、そ
の連通路２２に作動弁２３が接続される。The ejector 18 generates a suction flow by the compressed air passing through the bypass passage 16, and a communication passage 22 is provided by connecting the suction port 20 and the middle stage 21 of the casing 11, and an operation valve 23 is provided in the communication passage 22. Connected.
【００１６】開閉弁１７と作動弁２３とは、常時閉型の
二方弁からなり、常時はスプリング２４，２５にて閉と
なるポート２６，２７に保持され、開閉弁１７は、電磁
ソレノイド２８の励磁で開となるポート２９にされ、作
動弁２３は、開閉弁１７の開でバイパス通路１６から分
岐した制御ライン３０からの圧縮空気圧で開となるポー
ト３１にされる。The on-off valve 17 and the operating valve 23 are two-way valves of a normally closed type, and are held by ports 26 and 27 which are normally closed by springs 24 and 25. The opening of the opening / closing valve 17 causes the operating valve 23 to become a port 31 opened by the compressed air pressure from the control line 30 branched from the bypass passage 16.
【００１７】次に本発明の作用を述べる。Next, the operation of the present invention will be described.
【００１８】前段１４から吸い込まれた空気は羽根車１
３にて圧縮され後段１５より吐出される。この際、圧縮
空気の消費量が少なく、流量が少なくなるとストールが
発生し易くなるが、開閉弁１７の電磁ソレノイド２８を
励磁して開閉弁１７を開とすることで、後段１５の圧縮
空気がバイパス通路１６の上流側に導入され、イジェク
タ１８に導入される。また圧縮空気の一部は、制御ライ
ン３０に流れ、作動弁２３を開とする。イジェクタ１８
に圧縮空気が導入されることで、イジェクタ１８に吸引
力が生じ、中間段２１の圧縮途中の空気が連通路２２か
らイジェクタ１８に吸引され、バイパス通路１６からの
圧縮空気と共に下流側のバイパス通路１６よりノズル１
９を介してケーシング１１の前段１４に吹き込まれる。The air sucked from the front stage 14 is the impeller 1
It is compressed at 3 and discharged from the latter stage 15. At this time, if the consumption of the compressed air is small and the flow rate is small, the stall is likely to occur. However, by exciting the electromagnetic solenoid 28 of the on-off valve 17 and opening the on-off valve 17, the compressed air in the subsequent stage 15 It is introduced upstream of the bypass passage 16 and is introduced into the ejector 18. A part of the compressed air flows to the control line 30 to open the operation valve 23. Ejector 18
When compressed air is introduced into the ejector 18, a suction force is generated in the ejector 18, the air in the middle of compression of the intermediate stage 21 is sucked into the ejector 18 from the communication passage 22, and the compressed air from the bypass passage 16 and the downstream bypass passage Nozzle 1 from 16
The air is blown into the front stage 14 of the casing 11 through 9.
【００１９】このように後段１５からの抽気によりイジ
ェクタ１８を作動し、中間段２１の空気と共に前段１４
に吹き出すことで、後段１５の圧縮空気をそのまま吹き
込むより、少ない圧縮空気ですみ、かつ背圧を下げるの
で、後段１５の作動が楽になりストールの発生がなくな
る。また中間段２１の空気を吸い込むことで、その中間
段２１のケーシング１１内を流れる空気の壁面境界層が
薄くなるので、軸流方向の流速が増加してストールの発
生がなくなり、さらに前段１４のノズル１９から空気が
吹き込まれることで、羽根車１３の翼端の流体が活性化
され、結果としてストールマージンが全段にわたって改
善される。As described above, the ejector 18 is operated by the bleed air from the rear stage 15, and together with the air of the intermediate stage 21, the front stage 14
When the compressed air is blown out, the compressed air of the latter stage 15 is blown as it is, so that only a small amount of compressed air is used and the back pressure is reduced, so that the operation of the latter stage 15 becomes easier and stall is not generated. Further, by sucking the air of the intermediate stage 21, the wall boundary layer of the air flowing through the casing 11 of the intermediate stage 21 becomes thinner, so that the flow velocity in the axial flow direction is increased and the generation of stall is eliminated. By blowing air from the nozzle 19, the fluid at the blade tip of the impeller 13 is activated, and as a result, the stall margin is improved over all stages.
【００２０】[0020]
【発明の効果】以上要するに本発明によれば、後段の抽
気で、イジェクタを作動し、中間段の空気を吸引し、そ
の空気と共に前段に吹き込むようにしたので、多段圧縮
機の作動が全段に亘って改善することができ、全体スト
ールの発生を確実に回避できる。In summary, according to the present invention, the ejector is operated by the bleed air in the subsequent stage, the air in the intermediate stage is sucked, and the air is blown into the preceding stage together with the air. And stalls can be reliably avoided.
【図１】本発明の一実施の形態を示す概略図である。FIG. 1 is a schematic diagram showing an embodiment of the present invention.
１１ ケーシング １４ 前段 １５ 後段 １８ イジェクタ ２１ 中間段 11 casing 14 front stage 15 rear stage 18 ejector 21 intermediate stage
Claims (3)
る方法において、ケーシングの後段の圧縮空気を抽気し
てイジェクタに流し、そのイジェクタで生じた吸引流で
ケーシングの中間段の空気を吸引して抽気と共にケーシ
ングの前段に流すことを特徴とする多段圧縮機のストー
ル回避方法。In a method for avoiding a stall generated in a multi-stage compressor, compressed air at a later stage of a casing is extracted and flowed to an ejector, and air at an intermediate stage of the casing is sucked by a suction flow generated by the ejector. A stall avoidance method for a multi-stage compressor, characterized in that the gas is flowed to the front stage of a casing together with bleed air.
パス通路で接続すると共にそのバイパス通路にイジェク
タを接続し、そのイジェクタの吸込口とケーシングの中
間段とを連通させたことを特徴とする多段圧縮機のスト
ール回避装置。2. A multi-stage compressor wherein a rear stage and a front stage of a casing of the compressor are connected by a bypass passage, an ejector is connected to the bypass passage, and a suction port of the ejector communicates with an intermediate stage of the casing. Stall avoidance device for compressor.
閉弁を接続し、イジェクタの吸込口と中間段を結ぶ連通
路に開閉弁の作動で開閉する作動弁を接続した請求項２
記載の多段圧縮機のストール回避装置。3. An on-off valve is connected to a bypass passage on the upstream side of the ejector, and an operating valve which is opened and closed by the operation of the on-off valve is connected to a communication passage connecting the suction port of the ejector and the intermediate stage.
A stall avoidance device for a multi-stage compressor according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27156297A JPH11107997A (en) | 1997-10-03 | 1997-10-03 | Stall avoiding method of multistage compressor and device therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27156297A JPH11107997A (en) | 1997-10-03 | 1997-10-03 | Stall avoiding method of multistage compressor and device therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11107997A true JPH11107997A (en) | 1999-04-20 |
Family
ID=17501819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27156297A Pending JPH11107997A (en) | 1997-10-03 | 1997-10-03 | Stall avoiding method of multistage compressor and device therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11107997A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015057550A (en) * | 2014-12-19 | 2015-03-26 | 三菱重工業株式会社 | Multistage compressor |
-
1997
- 1997-10-03 JP JP27156297A patent/JPH11107997A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015057550A (en) * | 2014-12-19 | 2015-03-26 | 三菱重工業株式会社 | Multistage compressor |
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