JPH0759882B2 - Screw-expander reverse thrust prevention device - Google Patents
Screw-expander reverse thrust prevention deviceInfo
- Publication number
- JPH0759882B2 JPH0759882B2 JP60142760A JP14276085A JPH0759882B2 JP H0759882 B2 JPH0759882 B2 JP H0759882B2 JP 60142760 A JP60142760 A JP 60142760A JP 14276085 A JP14276085 A JP 14276085A JP H0759882 B2 JPH0759882 B2 JP H0759882B2
- Authority
- JP
- Japan
- Prior art keywords
- line
- pressure
- screw expander
- valve
- outlet line
- 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
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、スクリュー膨張機に付設され、負荷遮断時に
停止時に逆スラストが発生するのを防止するための逆ス
ラスト防止装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse thrust prevention device that is attached to a screw expander and that prevents reverse thrust from being generated when the load is stopped when the load is stopped.
一般にスクリュー膨張機では、第４図に示すようにスク
リュー膨張機21の入口に接続された入口ライン22に調節
弁24あるいはガバナを配設し、この調節弁24でガス流量
を調節してスクリュー膨張機21を所定回転数で回転さ
せ、図示しない発電機等の負荷を駆動し、出口ライン23
からガスを排出するように構成されている。また、負荷
が遮断したときにスクリュー膨張機21を直ちに停止する
ために、入口ライン22に遮断弁25を配設し、この遮断弁
25を閉じてガスの供給を停止するように構成されてい
る。なお、調節弁24と遮断弁25は一つにまとめて構成さ
れる場合もある。Generally, in a screw expander, a control valve 24 or a governor is arranged in an inlet line 22 connected to the inlet of the screw expander 21 as shown in FIG. The machine 21 is rotated at a predetermined speed to drive a load such as a generator (not shown), and the outlet line 23
Is configured to exhaust gas from the. Further, in order to immediately stop the screw expander 21 when the load is cut off, a cutoff valve 25 is arranged in the inlet line 22.
It is configured to close 25 to stop the supply of gas. The control valve 24 and the shutoff valve 25 may be integrated into one.
ところで、例えば負荷が発電機の場合、発電機は電気事
業法によって、発電機の負荷が遮断した場合は、定格の
111％の回転数で前記遮断弁25を緊急に遮断する必要が
ある。このように負荷に遮断した遮断弁25を閉じたとき
や通常停止で遮断弁25を閉じた時点では、スクリュー膨
張機21はまだ定格回転状態にあるため、スクリュー膨張
機21が停止するまでの短時間の間、ガス入口側に圧力が
真空近くまで低下して負圧状態となる。そのため、ガス
入口側とガス出口側の圧力が一時的に逆転し、この逆圧
によってスクリュー膨張機21のロータに逆スラストが加
わり、その結果、ロータが軸方向に移動してケーシング
端面と接触したり、ロータ同士が接触して膨張機自体が
損傷するといった問題を有していた。By the way, for example, if the load is a generator, the generator will be rated according to the Electricity Business Act if the load on the generator is cut off.
It is necessary to urgently shut off the shutoff valve 25 at a rotation speed of 111%. When the shut-off valve 25 shut off by the load in this way is closed or when the shut-off valve 25 is closed by normal stop, the screw expander 21 is still in the rated rotation state. During the time, the pressure on the gas inlet side drops to near vacuum and becomes a negative pressure state. Therefore, the pressures on the gas inlet side and the gas outlet side are temporarily reversed, and this reverse pressure adds reverse thrust to the rotor of the screw expander 21, and as a result, the rotor moves axially and comes into contact with the casing end surface. In addition, there is a problem in that the rotors come into contact with each other and the expander itself is damaged.
本発明は、上記従来の問題点を解決するためになされた
ものであって、遮断弁を閉じてスクリュー膨張機に対し
てガスの供給を停止した時に逆スラストが生じないよう
にスクリュー膨張機の逆スラスト防止装置の提供を目的
とするものである。The present invention has been made in order to solve the above-mentioned conventional problems, in which a reverse expansion thrust does not occur when the shutoff valve is closed and gas supply to the screw expansion machine is stopped. It is intended to provide a reverse thrust prevention device.
本第１発明に係るスクリュー膨張機の逆スラスト防止装
置は、スクリュー膨張機の入口ラインに配設された遮断
弁とスクリュー膨張機との間の管路を、上記遮断弁が閉
じられた後に該管路の圧力が出口ラインより低圧になる
と開く弁を介設した均圧管で出口ラインに接続し、遮断
弁が閉じたときにスクリュー膨張機の入口側が低圧状態
にならないようにして、スクリュー膨張機において逆圧
に起因する逆スラストの発生を防止するように構成した
ことを特徴とするものである。The reverse thrust prevention device for a screw expander according to the first aspect of the present invention provides a pipe line between a screw expander and a shutoff valve disposed in an inlet line of the screw expander after the shutoff valve is closed. When the pressure in the pipeline becomes lower than the outlet line, a pressure equalizing pipe with a valve that opens is connected to the outlet line to prevent the inlet side of the screw expander from becoming a low pressure state when the shutoff valve is closed. It is characterized in that it is configured so as to prevent the occurrence of reverse thrust due to the reverse pressure.
また、本第２発明に係るスクリュー膨張機の逆スラスト
防止装置は、スクリュー膨張機の入口ラインに配設され
た遮断弁が閉じられた後にこの遮断弁とスクリュー膨張
機との間の管路の圧力が出口ラインの圧力より低くなっ
たとき該管路と出口ラインとを連通する均圧管を設ける
とともに、前記遮断弁が閉じられたとき出口ラインを大
気に開放する大気放出ラインを出口ラインに設け、背圧
がある場合も出口側圧力を大気に開放することによって
逆圧を生じないようにしたことを特徴とするものであ
る。Further, the reverse thrust prevention device for a screw expander according to the second aspect of the present invention is configured so that the pipe between the cutoff valve and the screw expander is closed after the cutoff valve arranged in the inlet line of the screw expander is closed. A pressure equalizing pipe that connects the pipe line and the outlet line is provided when the pressure becomes lower than the pressure of the outlet line, and an atmosphere release line that opens the outlet line to the atmosphere when the shutoff valve is closed is provided in the outlet line. In the case where there is a back pressure, the back side pressure is not generated by opening the outlet side pressure to the atmosphere.
〔実施例１〕 本第１発明に係る実施例を第１図に基づいて説明すれ
ば、以下の通りである。[Embodiment 1] The following description will discuss Embodiment 1 of the present invention with reference to FIG.
この実施例の説明に先立って、まず原理的な構成をなす
第３図によって第１実施例の原理を説明をする。入口ラ
イン22における遮断弁25とスクリュー膨張機21との間の
管路26と、出口ライン23とを均圧管27で接続するととも
に、この均圧管27を出口ライン23側が相対的に高圧にな
ると連通するように（第３図では逆止弁28でその機能を
もたせている）構成することによって逆圧が生ずるのを
防止しているのである。Prior to the description of this embodiment, the principle of the first embodiment will be described with reference to FIG. A line 26 between the shutoff valve 25 and the screw expander 21 in the inlet line 22 and the outlet line 23 are connected by a pressure equalizing pipe 27, and the pressure equalizing pipe 27 communicates when the outlet line 23 side has a relatively high pressure. By doing so (the check valve 28 has the function in FIG. 3), the back pressure is prevented from occurring.
そこで第１図において、スクリュー膨張機１の入口にガ
スを供給する入口ライン２が接続され、出口には膨張し
たガスを排出する出口ライン３が接続されている。入口
ライン２にはスクリュー膨張機１へのガス流量を調節す
る調節弁４とガスの供給を遮断する遮断弁５が配設され
ている。入口ライン２における遮断弁５とスクリュー膨
張機１との間の管路６と、出口ライン３とは、電磁開閉
弁８を介設した均圧管７で接続されている。前記管路６
と出口ライン３にはそれぞれ圧力検知器９・10が設けら
れている。これら圧力検知器９・10は、その検知圧力を
比較して、圧力検知器９による検知圧力が圧力検知器10
による検知圧力よりも低くなると、検出信号を発生する
ように設定された逆圧検知器11が設けられ、この逆圧検
知器11からの検出信号により前記電磁開閉弁８を開動作
させて、入口ライン２と出口ライン３とが均圧状態にな
るように構成されている。Therefore, in FIG. 1, an inlet line 2 for supplying gas is connected to the inlet of the screw expander 1, and an outlet line 3 for discharging the expanded gas is connected to the outlet. The inlet line 2 is provided with a control valve 4 for controlling the gas flow rate to the screw expander 1 and a shutoff valve 5 for shutting off the gas supply. The line 6 between the shutoff valve 5 and the screw expander 1 in the inlet line 2 and the outlet line 3 are connected by a pressure equalizing pipe 7 having an electromagnetic opening / closing valve 8 interposed therebetween. The pipeline 6
Pressure detectors 9 and 10 are provided at the outlet line 3 and the outlet line 3, respectively. These pressure detectors 9 and 10 compare the detected pressures, and the pressure detected by the pressure detector 9 is the pressure detector 10.
When the pressure becomes lower than the pressure detected by the back pressure detector 11, a back pressure detector 11 is provided which is set to generate a detection signal. The detection signal from the back pressure detector 11 causes the electromagnetic on-off valve 8 to open, and the inlet The line 2 and the outlet line 3 are configured to be in a pressure equalized state.
上記の構成において、発電機等の負荷が遮断されて遮断
弁５を閉じると、ガスの供給が完全に断たれる一方、ス
クリュー膨張機１は惰性で回転を続けるため、その後、
入口ライン２の前記管路６部分の圧力が低下する。しか
し、この管路６部分の圧力が出口ライン３の圧力よりも
少しでも低くなると逆圧検知器11から検出信号が出力さ
れ電磁開閉弁８が開かれ、出口ライン３から均圧管７を
通ってガスが前記管路６内へ流れ込み、管路６と出口ラ
イン３が均圧化される。その結果、逆圧によってスクリ
ュー膨張機１のロータに逆スラストが働くといった事態
は回避されることになる。In the above configuration, when the load of the generator or the like is shut off and the shutoff valve 5 is closed, the gas supply is completely shut off, while the screw expander 1 continues to rotate by inertia.
The pressure in the line 6 portion of the inlet line 2 is reduced. However, when the pressure in the pipe line 6 becomes slightly lower than the pressure in the outlet line 3, a detection signal is output from the back pressure detector 11 to open the electromagnetic on-off valve 8, and the outlet line 3 passes through the pressure equalizing pipe 7. The gas flows into the pipe 6, and the pipe 6 and the outlet line 3 are pressure-equalized. As a result, the situation where reverse thrust acts on the rotor of the screw expander 1 due to reverse pressure is avoided.
〔実施例２〕 次に、本第２発明に係る実施例を第２図に基づいて説明
する。スクリュー膨張機１、入口ライン２、出口ライン
３、調節弁４、遮断弁５は第１図の実施例と同様であ
る。出口ライン３には逆止弁14が配設され、入口ライン
２における遮断弁５とスクリュー膨張機１との間の管路
６と、出口ライン３におけるスクリュー膨張機１と逆止
弁14との間の管路15とは、逆止弁17が介設された均圧管
16にて連通されている。また、出口ライン３における前
記管路15からは開放弁19を備えた大気放出ライン18が設
けられており、前記遮断弁５が閉じられたとき開放弁19
が開くように構成されている。[Embodiment 2] Next, an embodiment according to the second invention will be described with reference to FIG. The screw expander 1, the inlet line 2, the outlet line 3, the control valve 4, and the shutoff valve 5 are the same as those in the embodiment shown in FIG. A check valve 14 is provided in the outlet line 3, and a line 6 between the shutoff valve 5 and the screw expander 1 in the inlet line 2 and the screw expander 1 and the check valve 14 in the outlet line 3 are provided. The pipe line 15 between is a pressure equalizing pipe in which a check valve 17 is provided.
It is in communication with 16. Further, an atmospheric release line 18 having an open valve 19 is provided from the pipe line 15 in the outlet line 3, and the open valve 19 is provided when the shutoff valve 5 is closed.
Is configured to open.
この実施例においては、遮断弁５が閉じ、その後、入口
ライン側の前記管路６が低圧になると、均圧管16を通っ
て出口ライン３側のガスが流入する。このとき、出口ラ
イン３側の管路15は、遮断弁５が閉じたときに大気放出
ライン18から大気へ開放されているため、スクリュー膨
張機１に逆圧を生じることはない。また、この実施例で
は出口ライン３に逆止弁14を設けておいてスクリュー膨
張機１側の管路15を大気に開放するようにしているの
で、背圧による逆圧も防止できる。In this embodiment, when the shutoff valve 5 is closed and then the pressure in the pipe line 6 on the inlet line side becomes low, the gas on the outlet line 3 side flows through the pressure equalizing pipe 16. At this time, since the pipe line 15 on the outlet line 3 side is opened to the atmosphere from the atmosphere release line 18 when the shutoff valve 5 is closed, no reverse pressure is generated in the screw expander 1. Further, in this embodiment, since the check valve 14 is provided in the outlet line 3 to open the pipe line 15 on the screw expander 1 side to the atmosphere, back pressure due to back pressure can also be prevented.
尚、以上の実施例において調節弁４と遮断弁５は一体型
の構成とすることも可能である。In the above embodiment, the control valve 4 and the shutoff valve 5 may be integrated.
以上のように、本第１発明に係るスクリュー膨張機の逆
スラスト防止装置は、スクリュー膨張機の入口ラインに
配設された遮断弁とスクリュー膨張機との間の管路を、
上記遮断弁が閉じられた後に該管路の圧力が出口ライン
より低圧になると開く弁を介設した均圧管で出口ライン
に接続した構成である。As described above, the reverse thrust prevention device for a screw expander according to the first aspect of the present invention includes a pipe between the shutoff valve and the screw expander arranged in the inlet line of the screw expander.
After the shutoff valve is closed, when the pressure in the pipeline becomes lower than the outlet line, a pressure equalizing pipe provided with a valve that opens is connected to the outlet line.
これにより、遮断弁が閉じたときにスクリュー膨張機の
惰性回転によって入口側が低圧となってスクリュー膨張
機に逆圧が生じるのを防止できるので、この逆圧に起因
する逆スラストの発生を確実に防止することが可能とな
り、逆スラストによる軸受の損傷やロータの接触事故等
を回避し得る。As a result, when the shutoff valve is closed, it is possible to prevent the pressure on the inlet side from becoming low due to the inertial rotation of the screw expander, and thus it is possible to prevent the back pressure from being generated in the screw expander. This makes it possible to prevent damage to the bearing due to reverse thrust, contact accidents with the rotor, and the like.
また、本第２発明に係るスクリュー膨張機の逆スラスト
防止装置は、スクリュー膨張機の入口ラインに配設され
た遮断弁が閉じられた後にこの遮断弁とスクリュー膨張
機との間の管路の圧力が出口ラインの圧力より低くなっ
たとき該管路と出口ラインとを連通する均圧管と設ける
とともに、前記遮断弁が閉じられたとき出口ラインを大
気に開放する大気放出ラインを出口ラインに設けた構成
である。Further, the reverse thrust prevention device for a screw expander according to the second aspect of the present invention is configured so that the pipe between the cutoff valve and the screw expander is closed after the cutoff valve arranged in the inlet line of the screw expander is closed. A pressure equalizing pipe that connects the pipeline and the outlet line is provided when the pressure becomes lower than the pressure of the outlet line, and an atmosphere release line that opens the outlet line to the atmosphere when the shutoff valve is closed is provided in the outlet line. It has a different structure.
これにより、上記に加え、さらに、遮断弁が閉じたとき
出口ラインにおける背圧による逆圧の発生が防止され、
逆スラストによる軸受の損傷やロータの接触事故等をよ
り確実に回避し得る。By this, in addition to the above, when the shutoff valve is closed, the occurrence of back pressure due to back pressure in the outlet line is prevented,
It is possible to more reliably avoid damage to the bearing, accidental contact with the rotor, etc. due to reverse thrust.
第１図は本第１発明における一実施例の構成図、第２図
は本第２発明における一実施例の構成図、第３図は第１
発明の実施例の原理説明図、第４図は従来例の構成図で
ある。 １はスクリュー膨張機、２は入口ライン、３は出口ライ
ン、５は遮断弁、６は遮断弁とスクリュー膨張機との間
の管路、７・16は均圧管、８は電磁開閉弁、９・10は圧
力検知器、11は逆圧検知器、17は逆止弁、18は大気放出
ラインである。FIG. 1 is a block diagram of one embodiment of the first invention, FIG. 2 is a block diagram of one embodiment of the second invention, and FIG.
FIG. 4 is a diagram illustrating the principle of an embodiment of the invention, and FIG. 4 is a configuration diagram of a conventional example. 1 is a screw expander, 2 is an inlet line, 3 is an outlet line, 5 is a shutoff valve, 6 is a pipe line between the shutoff valve and the screw expander, 7/16 is a pressure equalizing pipe, 8 is an electromagnetic on-off valve, 9・ 10 is a pressure detector, 11 is a back pressure detector, 17 is a check valve, and 18 is an atmospheric release line.
Claims (2)
た遮断弁とスクリュー膨張機との間の管路を、上記遮断
弁が閉じられた後に該管路の圧力が出口ラインより低圧
になると開く弁を介設した均圧管で出口ラインに接続し
たことを特徴とするスクリュー膨張機の逆スラスト防止
装置。1. A pipeline between a shutoff valve disposed in an inlet line of a screw expander and the screw expander, when the pressure of the pipeline becomes lower than that of the outlet line after the shutoff valve is closed. A reverse thrust prevention device for a screw expander, characterized in that it is connected to the outlet line by a pressure equalizing pipe provided with an opening valve.
た遮断弁が閉じられた後にこの遮断弁とスクリュー膨張
機との間の管路の圧力が出口ラインの圧力より低くなっ
たとき該管路と出口ラインとを連通する均圧管を設ける
とともに、前記遮断弁が閉じられたとき出口ラインを大
気に開放する大気放出ラインを出口ラインに設けたこと
を特徴とするスクリュー膨張機の逆スラスト防止装置。2. When the pressure in the pipe line between the shut-off valve and the screw expander becomes lower than the pressure in the outlet line after the shut-off valve arranged in the inlet line of the screw expander is closed, the pipe is closed. Reverse thrust prevention of a screw expander, characterized in that a pressure equalizing pipe that connects the passage and the outlet line is provided, and an atmosphere release line that opens the outlet line to the atmosphere when the shutoff valve is closed is provided in the outlet line. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60142760A JPH0759882B2 (en) | 1985-06-28 | 1985-06-28 | Screw-expander reverse thrust prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60142760A JPH0759882B2 (en) | 1985-06-28 | 1985-06-28 | Screw-expander reverse thrust prevention device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS623105A JPS623105A (en) | 1987-01-09 |
| JPH0759882B2 true JPH0759882B2 (en) | 1995-06-28 |
Family
ID=15322937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60142760A Expired - Lifetime JPH0759882B2 (en) | 1985-06-28 | 1985-06-28 | Screw-expander reverse thrust prevention device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0759882B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2563826B2 (en) * | 1988-06-10 | 1996-12-18 | 旭ファイバーグラス株式会社 | Manufacturing method of antistatic glass fiber bundle, antistatic roving, resin reinforcing fiber and sheet molding compound |
| JP5460663B2 (en) * | 2011-09-07 | 2014-04-02 | 株式会社神戸製鋼所 | Power generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257147U (en) * | 1975-10-24 | 1977-04-25 |
-
1985
- 1985-06-28 JP JP60142760A patent/JPH0759882B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS623105A (en) | 1987-01-09 |
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