JPS623105A - Reverse thrust prevention device of screw expanding machine - Google Patents
Reverse thrust prevention device of screw expanding machineInfo
- Publication number
- JPS623105A JPS623105A JP14276085A JP14276085A JPS623105A JP S623105 A JPS623105 A JP S623105A JP 14276085 A JP14276085 A JP 14276085A JP 14276085 A JP14276085 A JP 14276085A JP S623105 A JPS623105 A JP S623105A
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- Prior art keywords
- pressure
- valve
- line
- pipe
- screw expander
- 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.)
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
・一本発明は、スクリュー膨張機に付設され、
負荷遮断時や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。[Detailed description of the invention] [Industrial application field]
・One of the present invention is attached to a screw expander,
This invention relates to a reverse thrust prevention device for preventing reverse thrust from occurring during load shedding or stoppage.
Ｃエイゎ ：′一般にスクリ
ュー膨張機では、第５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１つにまとめ
て構成される場合もある。C: 'Generally, in a screw expander, a regulating valve 24 or a governor is provided in the inlet line 22 connected to the inlet of the screw expander 21, as shown in Fig. 5, and the regulating valve 24 controls the gas flow rate. Adjust and rotate the screw expander 21 at a predetermined rotation speed,
It is configured to drive a load such as a generator (not shown) and discharge gas from the outlet line 23. Further, in order to immediately stop the screw expander 21 when the load is cut off, a cutoff valve 25 is disposed in the inlet line 22, and the structure is such that the cutoff valve 25 is closed to stop the gas supply. . Note that the control valve 24 and the cutoff valve 25 may be configured as one unit.
ところで、例えば負荷が発電機の場合、発電機は電気事
業法によって定格の１１１％以上の回転数に加速するこ
とを許容されていないため、発電機の負荷が遮断した場
合は前記遮断弁２５を緊急に遮断する必要がある。この
ように負荷が遮断して遮断弁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２
１はまだ定格回転状態にあるため、スクリュー膨張機２
１が停止するまでの短時間の間、ガス入口側の圧力が真
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 is not allowed to accelerate to a rotation speed of 111% or more of the rated speed according to the Electricity Business Act. It needs to be shut down urgently. In this way, when the load is cut off and the cutoff valve 25 is closed, or when the cutoff valve 25 is closed during a normal stop, the screw expander 2
1 is still in the rated rotation state, screw expander 2
During a short period of time until the gas inlet 1 stops, the pressure on the gas inlet side drops to near vacuum, resulting in a negative pressure state. Therefore, the pressures on the gas inlet side and the gas outlet side are temporarily reversed, and this reverse pressure applies a reverse thrust to the rotor of the screw expander 21. As a result, the rotor moves in the axial direction and comes into contact with the casing end surface. In addition, there were problems in that the rotors came into contact with each other and the expander itself was 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禿時に逆スラストが生じないよう
にした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 to solve the above-mentioned conventional problems, and is a screw expansion device that closes a shutoff valve to stop the gas supply to the screw expansion machine, thereby preventing reverse thrust from occurring during baldness. The purpose is to provide a reverse thrust prevention device for aircraft.
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
弁が閉じられたとき、この遮断弁とスクリュー膨張機と
の間の管路を相対的に高圧の他の管路に連通させるよう
に構成し、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 is arranged to separate the pipeline between the shutoff valve and the screw expander when the shutoff valve disposed in the inlet line of the screw expander is closed. The structure is configured so that the inlet side of the screw expander does not enter a low pressure state when the isolation valve closes, thereby preventing the occurrence of reverse thrust due to reverse pressure in the screw expander. This feature is characterized in that it is configured to prevent.
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、
両者を連通ず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。In addition, in the reverse thrust prevention device for a screw expander according to the second invention, a cutoff valve disposed on the inlet line of the screw expander is closed, and the pressure in the pipeline between the cutoff valve and the screw expander is reduced to the outlet. When the pressure becomes lower than the line pressure,
In addition to providing a pressure equalizing pipe that communicates the two, an atmospheric release line is provided that releases the outlet line to the atmosphere when the shutoff valve is closed. Even if there is back pressure, the outlet side pressure is released to the atmosphere to eliminate the back pressure. This feature is characterized by preventing this from occurring.
〔実施例１〕
本発明の第１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。[Example 1] The first example of the present invention will be described as follows based on FIG. 1.
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４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ずるように（第４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
、１って逆圧が生ずるのを防止している
のである。Prior to explaining this embodiment, the principle of the first embodiment will be explained with reference to FIG. 4, which shows the basic configuration. The pipe 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 this pressure equalizing pipe 27 is connected when the pressure on the outlet line 23 side becomes relatively high. By configuring the valves so that they can communicate (in FIG. 4, the check valve 28 has this function), the occurrence of back pressure is prevented.
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
１・゛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を備えた均圧管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・ 、。Therefore, in Fig. 1, the screw expander 1 is
``□An inlet line 2 for supplying gas is connected to the inlet, and an outlet line 3 for discharging expanded gas is connected to the outlet.
1. A control valve 4 for adjusting the gas flow rate to the tensioner 1 and a cutoff valve 5 for cutting off the gas supply are provided. entrance
A conduit 6 between the cutoff valve 5 and the screw expander 1 in line 2 and the outlet line 3 are connected by a pressure equalizing pipe 7 equipped with an electromagnetic on-off valve 8. The pipe line 6 and the outlet line 3 are each equipped with a pressure sensor 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
１、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とが均圧状態となるように構成
されている。10 are provided. These pressure detectors 9 and 10 are
Compare the detected pressure and send it to the pressure detector 9.
1. A reverse pressure detector 11 is provided, which is configured to generate a detection signal when the detected pressure by the pressure detector 10 becomes lower than the pressure detected by the pressure detector 10. The opening/closing valve 8 is opened so that the inlet line 2 and the outlet line 3 are brought into an equal pressure 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、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（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 etc. is cut off and the cutoff valve 5 is closed, the gas supply is completely cut off, while the screw expander 1 continues to rotate due to inertia. The pressure in the passage 6 section decreases. However, when the pressure in this pipe line 6 becomes even slightly lower than the pressure in the outlet line 3, a detection signal is output from the back pressure detector 11, the electromagnetic on-off valve 8 is opened, and the pressure is passed from the outlet line 3 to the pressure equalizing pipe 7. Gas flows into the pipe 6, and the pressure in the pipe 6 and the outlet line 3 is equalized. As a result, a situation in which reverse thrust is exerted on the rotor of the screw expander 1 due to the reverse pressure is avoided.
〔実施例２〕 次に第２実施例を第２図に基づいて説明する。[Example 2] Next, a second embodiment will be described based on FIG.
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り、遮断
弁５とスクリュー膨張機１との間の管路６と、入口ライ
ン２の元圧部とに、遮断弁５及び調節弁４をバイパスし
て連通ずる導入管１２が設けられるとともに、この導入
管１２を開閉する均圧弁１３が設けられており、前記遮
断弁５が閉じられたときに均圧弁１３が開くように構成
されている。The screw expander 1, the inlet line 2, the outlet line 3, the control valve 4, and the cutoff valve 5 are the same as those in the embodiment shown in FIG. An introduction pipe 12 that communicates with the main pressure part of the line 2 by bypassing the cutoff valve 5 and the control valve 4 is provided, and a pressure equalization valve 13 that opens and closes this introduction pipe 12 is provided. The pressure equalizing valve 13 is configured to open when the pressure equalizing valve 13 is closed.
この実施例においても遮断弁５が閉じると、均
゛圧弁１３が開いて入口ライン２の元圧部からガ
スが導入されるため、逆圧を生ずることはない。尚、均
圧弁１３は出口ライン３の圧力とほぼ等しい圧力に設定
されており、前記管路６の圧力がスクリュー膨張機１を
作動させるような圧力になることはない。In this embodiment as well, when the shutoff valve 5 closes, the
``Since the pressure valve 13 is opened and gas is introduced from the source pressure part of the inlet line 2, no back pressure is generated. Note that the pressure equalizing valve 13 is set at approximately the same pressure as the pressure in the outlet line 3, so that the pressure in the pipe line 6 does not reach a level that would cause the screw expander 1 to operate.
〔実施例３〕
次に、本第２発明を第３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と久クリニー膨張機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とが、逆止弁１７を設けられた均圧管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（ように構成されている。[Embodiment 3] Next, the second invention will be explained based on FIG. 3. Screw expander 1, inlet line 2, outlet line 3, control valve 4
, the shutoff valve 5 is similar to the embodiment of FIG. A check valve 14 is disposed in the outlet line 3, and a conduit 6 between the cutoff valve 5 and the Kuliny expander 1 in the inlet line 2, and a conduit 6 between the screw expander 1 and the check valve 14 in the outlet line 3. A pipe line 15 between the two is connected through a pressure equalizing pipe 16 provided with a check valve 17. Further, an atmosphere discharge line 18 equipped with a release valve 19 is provided from the pipe line 15 in the outlet line 3, and the release valve 19 is configured to open when the cutoff valve 5 is closed.
この実施例においては、遮断弁５が閉じて入口ライン側
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と同時に、出口ライン３側
の管路１５が大気放出ライン１８から大気へ開放される
ため、スクリュー膨張機１に逆圧を生じることはない。In this embodiment, when the shutoff valve 5 is closed and the pressure in the conduit 6 on the inlet line side becomes low, the gas on the outlet line 3 side flows through the pressure equalizing pipe 16, and at the same time, the conduit 15 on the outlet line 3 side is released to the atmosphere from the atmosphere discharge line 18, so no back pressure is generated in the screw expander 1.
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
。Further, in this embodiment, a check valve 14 is provided in the outlet line 3 so that the pipe line 15 on the side of the screw expander 1 is opened to the atmosphere, so that back pressure due to back pressure can 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 addition, in the above embodiment, the control valve 4 and the cutoff valve 5 can also be configured as an integrated type.
本発明に係るスクリュー膨張機の逆スラスト防止装置に
よれば、以上のように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ときこの遮断弁とスクリ
ュー膨張機との間の管路を相対的に高圧の他の管路に連
通させるように構成しているので、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を生じるのを防止でき、
この逆圧に起因する逆スラストの発生を確実ネこ防
、。According to the reverse thrust prevention device for a screw expander according to the present invention, when the shutoff valve disposed in the inlet line of the screw expander is closed as described above, the pipe between the shutoff valve and the screw expander is closed. The passage is configured to communicate with other relatively high-pressure pipelines, so when the isolation valve closes, the inlet side becomes low pressure due to the inertial rotation of the screw expander, creating a reverse pressure in the screw expander. It can prevent
Reliably prevents the occurrence of reverse thrust caused by this reverse pressure.
,.
止することができ、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。また、
遮断弁が閉じたとき出口ラインを大気に開放するよう
′にすると、背圧のある場合でも背圧によ
る逆圧の発生を防止することが可能となる等の効果を奏
するものである。Can prevent bearing damage due to reverse thrust
′ and rotor contact accidents can be avoided. Also,
to open the outlet line to atmosphere when the isolation valve closes.
', even if there is back pressure, it is possible to prevent the generation of back pressure due to back pressure.
第１図は本第１発明の第１実施例の構成図、第２図は第
２実施例の構成図、第３図は本第２発明における構成図
、第４図は第１発明の実施例の原理説明図、第５図は従
来例の構成図である。
ｌ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−膨張機管の管
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、１２は導入管、１３は均
圧弁、１７は逆止弁、１Ｂは大気放出ラインである。
特許出願人 株式会社 神戸製鋼所第１図
第４図Fig. 1 is a block diagram of the first embodiment of the first invention, Fig. 2 is a block diagram of the second embodiment, Fig. 3 is a block diagram of the second invention, and Fig. 4 is an implementation of the first invention. An example principle explanatory diagram, FIG. 5, 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 pipeline between the shutoff valve and the screw expander pipe, 7 and 16 are pressure equalization pipes, 8 is an electromagnetic on-off valve, 9. 10 is a pressure detector, 11 is a back pressure detector, 12 is an inlet pipe, 13 is a pressure equalizing valve, 17 is a check valve, and 1B is an atmospheric discharge line. Patent applicant: Kobe Steel, Ltd. Figure 1 Figure 4
Claims (1)
が閉じられたときこの遮断弁とスクリュー膨張機との間
の管路を、相対的に高圧となる他の管路に連通可能とな
るよう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。 ２、遮断弁とスクリュー膨張機との間の管路は、この管
路が出口ラインより低圧になると開く弁を備えた均圧管
で出口ラインに接続されている特許請求の範囲第１項記
載のスクリュー膨張機の逆スラスト防止装置。 ３、遮断弁とスクリュー膨張機との間の管路は、入口ラ
インの元圧部に均圧弁を介して連通可能となるように接
続されたものである特許請求の範囲第１項記載のスクリ
ュー膨張機の逆スラスト防止装置。 ４、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両者を連
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。[Scope of Claims] 1. When the shutoff valve disposed in the inlet line of the screw expander is closed, the pipe line between the shutoff valve and the screw expander is connected to another pipe that has a relatively high pressure. A reverse thrust prevention device for a screw expander, characterized in that it is connected so as to be able to communicate with a road. 2. The pipe line between the shutoff valve and the screw expander is connected to the outlet line by a pressure equalizing pipe equipped with a valve that opens when the pressure becomes lower than the outlet line. Reverse thrust prevention device for screw expanders. 3. The screw according to claim 1, wherein the pipe line between the shutoff valve and the screw expander is connected to the source pressure part of the inlet line so as to be able to communicate through a pressure equalizing valve. Expander reverse thrust prevention device. 4. When the shutoff valve installed in the inlet line of the screw expander is closed and the pressure in the pipeline between this shutoff valve and the screw expander becomes lower than the pressure in the outlet line, the pressure equalizing pipe connecting the two is opened. A reverse thrust prevention device for a screw expander, characterized in that the outlet line is further provided with an atmosphere release line that opens the outlet line to the atmosphere when the shutoff valve is closed.
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 true JPS623105A (en) | 1987-01-09 |
| JPH0759882B2 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01313346A (en) * | 1988-06-10 | 1989-12-18 | Asahi Fiber Glass Co Ltd | Production of antistatic glass fiber bundle, antistatic glass fiber roving, fiber material for reinforcing resin and sheet molding compound |
| JP2013057264A (en) * | 2011-09-07 | 2013-03-28 | Kobe Steel Ltd | Generator |
Citations (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
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257147U (en) * | 1975-10-24 | 1977-04-25 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01313346A (en) * | 1988-06-10 | 1989-12-18 | Asahi Fiber Glass Co Ltd | Production of antistatic glass fiber bundle, antistatic glass fiber roving, fiber material for reinforcing resin and sheet molding compound |
| JP2013057264A (en) * | 2011-09-07 | 2013-03-28 | Kobe Steel Ltd | Generator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0759882B2 (en) | 1995-06-28 |
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