JP3382803B2 - Ejector device - Google Patents

Ejector device

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Publication number
JP3382803B2
JP3382803B2 JP00756897A JP756897A JP3382803B2 JP 3382803 B2 JP3382803 B2 JP 3382803B2 JP 00756897 A JP00756897 A JP 00756897A JP 756897 A JP756897 A JP 756897A JP 3382803 B2 JP3382803 B2 JP 3382803B2
Authority
JP
Japan
Prior art keywords
primary fluid
ejector
plug
pressure
ejection hole
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
JP00756897A
Other languages
Japanese (ja)
Other versions
JPH10206285A (en
Inventor
敬 西脇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP00756897A priority Critical patent/JP3382803B2/en
Publication of JPH10206285A publication Critical patent/JPH10206285A/en
Application granted granted Critical
Publication of JP3382803B2 publication Critical patent/JP3382803B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、低圧室を実現する
ための排気装置等に用いられるエジェクタ装置に関す
る。 【0002】 【従来の技術】ロケットエンジンやジェットエンジンの
高空模擬試験を行う試験設備では、試験室を低圧にする
必要があり、このような場合に排気装置としてエジェク
タ装置が使用される。 【0003】図3に従来のエジェクタ装置の構造を示し
てある。図3において、1はエジェクタ本体で、圧力室
4を有し、圧力室4には一次流体供給ライン6、スロー
ト部9、及びノズルスカート11が設けられている。 【0004】図3に示すように、従来のエジェクタ装置
では、そのスロート部9の有効断面積は固定されてお
り、通過する一次流体の流速は圧力室4の圧力に比例し
たものとなる。なお、図3において、2−1はディフュ
ーザ入口(二次流入口)、2−2はディフューザスロー
ト部、2−3はディフューザ出口を示している。 【0005】 【発明が解決しようとする課題】図3に示したように、
従来のエジェクタ装置では、その作動範囲を制御するの
に一次流体供給圧力を変えるしかない。一次流体の流量
と圧力の関係は1つの固定された曲線しかなく、エジェ
クタ装置の作動範囲は極めて限られていた。 【0006】特に、二次流体の流量を大幅に変えること
なく二次流体圧を下げるためには、一次流体の流量を減
らす必要があるが、このためには一次流体供給圧力を下
げるしか方法がない。 【0007】ところが超音速エジェクタ装置の場合、一
次流体は、(ノズル開口面積)/(スロート面積)以下
での膨張比を取れないのでエジェクタ装置の性能を変え
るのに自ずと制限があり、超音速ディフューザとして作
動しなくなる、いわゆるブレイク現象が発生し、逆に二
次流体圧は上がってしまう。 【0008】また、二次流体圧を或る範囲内にして二次
流体の流量を上げる時、従来方式では一次流体の供給圧
力を上げることしかできず、この方法だと二次流体圧も
上がって了うという問題がある。 【0009】本発明は、二次流体の流量を大幅に変える
ことなく二次流体圧を下げたり、二次流体圧を上昇させ
ることなく二次流体の流量を増やすなど作動範囲を拡大
したエジェクタ装置を提供することを課題としている。 【0010】 【課題を解決するための手段】本発明は、前記課題を解
決するため、一次流体の供給圧力だけでなく、一次流体
に対するスロート面積(スロート径)の可変をパラメー
タとして加えられる構造のエジェクタ装置を提供する。 【0011】すなわち、本発明は、ディフューザ及び同
ディフューザ内に同軸に配設され一次流体噴出孔を具え
たエジェクタ本体を有するエジェクタ装置において、
記エジェクタ本体は、先端が尖った円錐形で前記一次流
体噴出孔に対し内部から進退され同一次流体噴出孔との
間に環状のスロート部を形成するプラグを設ける。更
に、そのプラグを前記した一次流体噴出孔に向け進退さ
スロート面積を変えるプラグ駆動装置を設けた構造の
エジェクタ装置とする。 【0012】本発明によるエジェクタ装置は前記した構
成を有していて、第一次流体噴出孔とプラグとの間の環
状のスロート部のスロート面積がプラグの進退動により
変化される。これにより一次流体の流量と圧力の関係
は、一曲線上に限定されることなく、幅のある曲線上に
広げられることとなり、エジェクタの作動範囲は拡大す
る。 【0013】具体的には、本発明によるエジェクタ装置
では、スロート面積を絞り一次流体を高圧で供給すれば
従来の装置で発生していたプレイク現象を生ずることが
ない。 【0014】また、或る二次流体圧の範囲内で二次流体
の流量を上げるとき、従来のエジェクタ装置では一次流
体供給圧力を上げることしかできず、この方式だと二次
流体圧も上がる。しかしながら、本発明によるエジェク
タ装置では、一次流体供給圧力は一定でスロート径を大
きくして一次流体流量を増やせば、二次流体圧力を上昇
させることなく二次流体流量を増やすことができる。 【0015】 【発明の実施の形態】以下、本発明によるエジェクタ装
置について図1に示した実施の一形態に基づいて具体的
に説明する。なお、以下の実施の形態において、図3に
示した従来の装置と同じ構成の部分には説明を簡単にす
るため同じ符号を付してあり、それらについての重複す
る説明は省略する。 【0016】エジェクタ本体1は、プラグ3、圧力室
4、プラグ駆動装置5から構成される。また、圧力
にはエジェクタの作動流体となる一次流体供給ライン6
が接続されている。 【0017】プラグ3は、先端が尖った円錐形で、一次
流体噴出孔に対し内部から進退され、その一次流体噴出
孔との間に環状のスロート部9を形成するように構成さ
れている。 【0018】プラグ3はプラグ駆動装置5により一次流
体噴出孔に向け前後に移動され、これによってスロート
部9の有効面積を変化させて、一次流体の流れる流量を
変化させることができる。 【0019】一次流体供給ライン6により供給される気
体は、圧力室4に入り、スロート部9を通過して音速以
上の速度となり、さらにプラグ3の斜面で滑らかに膨張
加速する。これにより従来のエジェクタ装置より10〜
20%程度多い流量を流すことができエジェクタ性能を
向上させる。なお、プラグ駆動装置5は、ギヤを利用し
た手動駆動や、油圧を利用した油圧アクチュエータ駆
動、電動モータ駆動等、種々の構成のものであってよ
い。 【0020】以上、本発明を図示した実施の一形態に基
づいて具体的に説明したが、本発明がこれらの実施形態
に限定されず特許請求の範囲に示す本発明の範囲内で、
その具体的構造、構成に種々の変更を加えてよいことは
いうまでもない。 【0021】例えば、上記実施形態では図1のAに示す
ようにエジェクタ本体1を1個だけ設けているが、図1
のB部に適宜の個数を直列に配置してもよい。 【0022】 【発明の効果】以上説明したように、本発明は、ディフ
ューザ及び同ディフューザ内に同軸に配設され一次流体
噴出孔を具えたエジェクタ本体を有するエジェクタ装置
において、前記エジェクタ本体は、先端が尖った円錐形
で前記一次流体噴出孔に対し内部から進退され同一次流
体噴出孔との間に環状のスロート部を形成するプラグ
と、同プラグを前記一次流体噴出孔に向け進退させスロ
ート面積を変えるプラグ駆動装置を有する構成のエジェ
クタ装置を提供する。 【0023】このエジェクタ装置においては、そのプラ
グをプラグ駆動装置によって進退させることにより第一
次流体噴出孔とプラグの間の環状のスロート部のスロー
ト面積が変化され一次流体の流量と圧力の関係は一曲線
上に限定されることなく幅のある曲線上に広げられエジ
ェクタの作動範囲は拡大する。 【0024】また、本発明によるエジェクタ装置では円
錐形のプラグを用い、そのプラグと一次流体噴出孔との
間に環状のスロート部を形成させているので、一次流体
の流れに対しスロート以降も流路形状が滑らかに変化す
るので、従来のエジェクタ装置のように一次流体の流路
がスロート部の出口から急拡大して剥離を起こすような
ことがなくエジェクタとしての性能が向上する。
Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an ejector device used for an exhaust device or the like for realizing a low-pressure chamber. 2. Description of the Related Art In a test facility for performing a high altitude simulation test of a rocket engine or a jet engine, it is necessary to set a test chamber to a low pressure. In such a case, an ejector is used as an exhaust device. FIG. 3 shows the structure of a conventional ejector device. In FIG. 3, reference numeral 1 denotes an ejector main body, which has a pressure chamber 4, and the pressure chamber 4 is provided with a primary fluid supply line 6, a throat portion 9, and a nozzle skirt 11. As shown in FIG. 3, in the conventional ejector device, the effective cross-sectional area of the throat portion 9 is fixed, and the flow rate of the primary fluid passing therethrough is proportional to the pressure in the pressure chamber 4. In FIG. 3, 2-1 indicates a diffuser inlet (secondary inlet), 2-2 indicates a diffuser throat portion, and 2-3 indicates a diffuser outlet. [0005] As shown in FIG. 3,
In conventional ejector devices, the only way to control its operating range is to change the primary fluid supply pressure. The relationship between the flow rate and pressure of the primary fluid was only one fixed curve, and the operating range of the ejector device was extremely limited. In particular, in order to lower the secondary fluid pressure without greatly changing the flow rate of the secondary fluid, it is necessary to reduce the flow rate of the primary fluid, but the only way to do this is to lower the primary fluid supply pressure. Absent. However, in the case of a supersonic ejector device, the primary fluid cannot take an expansion ratio of (nozzle opening area) / (throat area) or less, so that there is a natural limitation in changing the performance of the ejector device, and a supersonic diffuser is required. As a result, a so-called break phenomenon occurs, and conversely, the secondary fluid pressure increases. Further, when the secondary fluid pressure is set within a certain range to increase the flow rate of the secondary fluid, the conventional method can only increase the supply pressure of the primary fluid, and this method also increases the secondary fluid pressure. There is a problem of ending. The present invention provides an ejector device having an extended working range, such as lowering the secondary fluid pressure without significantly changing the flow rate of the secondary fluid, or increasing the flow rate of the secondary fluid without increasing the secondary fluid pressure. The challenge is to provide [0010] In order to solve the above-mentioned problems, the present invention has a structure in which not only the supply pressure of the primary fluid but also a variable throat area (throat diameter) for the primary fluid is added as a parameter. An ejector device is provided. [0011] Namely, the present invention provides a ejector device having an ejector body which comprises a primary fluid jet holes are disposed coaxially diffuser and the same diffuser, before
The ejector body is provided with a plug having a pointed conical shape which is advanced and retracted from the inside of the primary fluid ejection hole to form an annular throat portion with the same primary fluid ejection hole. Moreover, the ejector device having the structure in which a plug driving apparatus Ru changing the throat area to advance and retreat toward the plug into the primary fluid jet holes described above. The ejector device according to the present invention has the above-described configuration, and the throat area of the annular throat portion between the primary fluid ejection hole and the plug is changed by the advance and retreat of the plug. As a result, the relationship between the flow rate and the pressure of the primary fluid is not limited to one curve, but is expanded on a wide curve, and the operating range of the ejector is expanded. More specifically, in the ejector device according to the present invention, if the throat area is reduced and the primary fluid is supplied at a high pressure, the break phenomenon that occurs in the conventional device does not occur. Further, when increasing the flow rate of the secondary fluid within a certain range of the secondary fluid pressure, the conventional ejector device can only increase the primary fluid supply pressure, and this system also increases the secondary fluid pressure. . However, in the ejector device according to the present invention, if the primary fluid supply pressure is constant and the throat diameter is increased to increase the primary fluid flow rate, the secondary fluid flow rate can be increased without increasing the secondary fluid pressure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an ejector device according to the present invention will be specifically described based on one embodiment shown in FIG. In the following embodiments, the same components as those of the conventional device shown in FIG. 3 are denoted by the same reference numerals for simplification of description, and redundant description thereof will be omitted. The ejector body 1 comprises a plug 3, a pressure chamber 4, and a plug driving device 5. Also, the pressure chamber 4
Has a primary fluid supply line 6 serving as a working fluid of the ejector.
Is connected. The plug 3 has a conical shape with a sharp tip, and is configured to advance and retreat from the inside with respect to the primary fluid ejection hole, and to form an annular throat portion 9 with the primary fluid ejection hole. The plug 3 is moved back and forth toward the primary fluid ejection hole by the plug drive device 5, whereby the effective area of the throat portion 9 can be changed and the flow rate of the primary fluid can be changed. The gas supplied by the primary fluid supply line 6 enters the pressure chamber 4, passes through the throat 9, has a speed higher than the speed of sound, and further smoothly expands and accelerates on the slope of the plug 3. This makes the conventional ejector device 10-
The flow rate can be increased by about 20% to improve the ejector performance. The plug driving device 5 may have various configurations such as manual driving using gears, hydraulic actuator driving using hydraulic pressure, and electric motor driving. As described above, the present invention has been specifically described based on one embodiment shown in the drawings. However, the present invention is not limited to these embodiments, and within the scope of the present invention shown in the claims,
It goes without saying that various changes may be made to the specific structure and configuration. For example, in the above embodiment, only one ejector main body 1 is provided as shown in FIG.
A suitable number may be arranged in series in section B. As described above, the present invention relates to an ejector apparatus having a diffuser and an ejector body provided coaxially in the diffuser and having a primary fluid ejection hole, wherein the ejector body has a tip end. and a plug to form a throat portion of an annular between the pointed the conical be retractable from inside to the primary fluid jet holes identical following fluid ejection holes, Ro moved back and forth toward the same plug to the primary fluid jet holes
Providing an ejector device configurations having plug driving apparatus Ru changed over preparative area. In this ejector device, by moving the plug forward and backward by the plug driving device, the throat area of the annular throat portion between the primary fluid ejection hole and the plug is changed, and the relationship between the flow rate and pressure of the primary fluid is changed. The operating range of the ejector is expanded not only on one curve but on a wide curve. In the ejector device according to the present invention, a conical plug is used, and an annular throat portion is formed between the plug and the primary fluid ejection hole. Since the path shape changes smoothly, the performance of the ejector is improved without the flow path of the primary fluid suddenly expanding from the outlet of the throat portion and causing separation, unlike the conventional ejector device.

【図面の簡単な説明】 【図1】本発明の実施の一形態によるエジェクタ装置の
構造を示す説明図。 【図2】図1におけるC部の拡大図。 【図3】従来のエジェクタ装置の構造を示す説明図。 【符号の説明】 1 エジェクタ本体 2 ディフューザ 3 プラグ 4 圧力室 5 プラグ駆動装置 6 一次流体供給ライン 9 スロート部 2−1 ディフューザ入口 2−2 ディフューザスロート部 2−3 ディフューザ出口 11 ノズルスカート
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing a structure of an ejector device according to an embodiment of the present invention. FIG. 2 is an enlarged view of a portion C in FIG. FIG. 3 is an explanatory view showing the structure of a conventional ejector device. [Description of Signs] 1 Ejector main body 2 Diffuser 3 Plug 4 Pressure chamber 5 Plug drive 6 Primary fluid supply line 9 Throat 2-1 Diffuser inlet 2-2 Diffuser throat section 2-3 Diffuser outlet 11 Nozzle skirt

フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G01M 15/00 F02C 3/32 JICSTファイル(JOIS)Continuation of the front page (58) Field surveyed (Int. Cl. 7 , DB name) G01M 15/00 F02C 3/32 JICST file (JOIS)

Claims (1)

(57)【特許請求の範囲】 【請求項1】 ディフューザ及び同ディフューザ内に同
軸に配設され一次流体噴出孔を具えたエジェクタ本体を
有するエジェクタ装置において、前記エジェクタ本体
は、先端が尖った円錐形で前記一次流体噴出孔に対し内
部から進退され同一次流体噴出孔との間に環状のスロー
ト部を形成するプラグと、同プラグを前記一次流体噴出
孔に向け進退させスロート面積を変えるプラグ駆動装置
を有することを特徴とするエジェクタ装置。
(57) In the ejector apparatus having the Patent Claims 1 ejector body comprising a diffuser and a primary fluid jet holes are disposed coaxially within the diffuser, the ejector body
Is a plug having a pointed conical shape which advances and retreats from the inside with respect to the primary fluid ejection hole to form an annular throat portion between the primary fluid ejection hole and the same primary fluid ejection hole, and moves the plug toward the primary fluid ejection hole ejector unit, characterized in that it comprises a plug driving apparatus Ru changing the throat area to.
JP00756897A 1997-01-20 1997-01-20 Ejector device Expired - Lifetime JP3382803B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP00756897A JP3382803B2 (en) 1997-01-20 1997-01-20 Ejector device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00756897A JP3382803B2 (en) 1997-01-20 1997-01-20 Ejector device

Publications (2)

Publication Number Publication Date
JPH10206285A JPH10206285A (en) 1998-08-07
JP3382803B2 true JP3382803B2 (en) 2003-03-04

Family

ID=11669422

Family Applications (1)

Application Number Title Priority Date Filing Date
JP00756897A Expired - Lifetime JP3382803B2 (en) 1997-01-20 1997-01-20 Ejector device

Country Status (1)

Country Link
JP (1) JP3382803B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW441766U (en) * 2000-08-03 2001-06-16 Huang Ming Shu Air exchanging apparatus of air conditioner
US7536864B2 (en) * 2005-12-07 2009-05-26 General Electric Company Variable motive nozzle ejector for use with turbine engines

Also Published As

Publication number Publication date
JPH10206285A (en) 1998-08-07

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