JPH0143156B2 - - Google Patents
Info
- Publication number
- JPH0143156B2 JPH0143156B2 JP56144428A JP14442881A JPH0143156B2 JP H0143156 B2 JPH0143156 B2 JP H0143156B2 JP 56144428 A JP56144428 A JP 56144428A JP 14442881 A JP14442881 A JP 14442881A JP H0143156 B2 JPH0143156 B2 JP H0143156B2
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- stage
- gas
- valve
- stage compressor
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Description
【発明の詳細な説明】
本発明は、多段ガス往復動圧縮機を無負荷起動
できるようにした運転制御装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control device that enables a multi-stage gas reciprocating compressor to be started without load.
多段ガス往復動圧縮機は、低段側圧縮機から高
段側圧縮機へ、圧縮比に応じてシリンダ径も小さ
くなるように設計しているので、低段側圧縮機と
高段側圧縮機とを同時に起動するときは、中間段
における圧縮機が機内において仕事をして圧力が
上昇し、そのため多段ガス圧縮機を駆動する駆動
電動機は負荷起動を余儀なくし、電力消費上極め
て不利であるばかりでなく、高段側圧縮機ほどピ
ストンリングや軸受関係の摺動部分の摩耗が激し
くなる傾向があるので、負荷がかかる前に無負荷
で前記摺動部分のなじみ運転を行なう必要があつ
た。 Multi-stage gas reciprocating compressors are designed so that the cylinder diameter decreases from the low-stage compressor to the high-stage compressor according to the compression ratio. When starting the gas compressor at the same time, the compressor in the intermediate stage performs work inside the machine and the pressure rises, forcing the drive motor that drives the multistage gas compressor to start under load, which is extremely disadvantageous in terms of power consumption. However, since the piston rings and bearing-related sliding parts tend to wear more severely in higher-stage compressors, it is necessary to run the sliding parts under no load before applying a load.
このため、従来、多段ガス往復動圧縮機の低段
側圧縮機及び高段側圧縮機の各吸入弁に吸入弁開
放型アンローダを取りつけ、高段側圧縮機の吐出
圧力が一定圧力以上になると前記アンローダがそ
れぞれ作動して吸入弁を強制的に開くようにし、
吸入弁より吸入されたガスはシリンダ内では圧縮
されずに再び吸入側へ吹き返して圧縮機を無負荷
運転できるようにした装置が考えられたが、高段
側圧縮機の吸入弁に取りつける前記アンローダは
耐圧力の大きいものが必要で、コスト面、信頼面
いずれも不利な上に、前記アンローダを実ガスで
操作させる場合は高段側圧縮機の吐出圧力が出る
まで前記アンローダを作動させることができず、
直ちになじみ運転に入ることができないなどの欠
点を有していた。また、多段ガス往復動圧縮機の
運転停止後、機内残留ガスを膨張タンクに回収
し、次回起動時低段側圧縮機に吸入させる装置が
考えられたが、この場合は大きな膨張タンクを必
要とする上に、多段ガス往復動圧縮機の駆動機を
連続回転しなければ次回起動時の残留ガス回収が
終らないなどの欠点を有していた。 For this reason, conventionally, a suction valve opening type unloader is attached to each suction valve of the low-stage compressor and high-stage compressor of a multi-stage gas reciprocating compressor, and when the discharge pressure of the high-stage compressor exceeds a certain pressure, each of the unloaders is actuated to forcibly open the suction valve;
A device has been considered in which the gas sucked in from the suction valve is not compressed in the cylinder and is blown back to the suction side to allow the compressor to operate under no load. The unloader must have a high pressure resistance, which is disadvantageous in terms of both cost and reliability.In addition, when the unloader is operated with actual gas, it is difficult to operate the unloader until the discharge pressure of the high-stage compressor is reached. I can't do it,
This had drawbacks such as the inability to immediately begin running-in. Another idea was to use a device that collects residual gas in an expansion tank after the multistage gas reciprocating compressor stops operating, and then inhales it into the lower stage compressor the next time it is started, but this would require a large expansion tank. In addition, it has the disadvantage that residual gas recovery at the next startup cannot be completed unless the drive machine of the multistage gas reciprocating compressor is continuously rotated.
本発明は、上記問題点を解決した多段ガス往復
動圧縮機の運転制御装置を提供するものであり、
多段ガス往復動圧縮機の運転を停止した時に高段
側圧縮機の吸入側に残る機内残留ガスの量を少な
くするようにして、高段側圧縮機に、コスト面及
び信頼面で不利になる従来の吸入弁開放型アンロ
ーダを取り付けることなく、多段ガス往復動圧縮
機を無負荷で起動することができるようにした運
転制御装置を提供するものである。 The present invention provides an operation control device for a multistage gas reciprocating compressor that solves the above problems.
By reducing the amount of residual gas remaining on the suction side of the high-stage compressor when the operation of the multi-stage gas reciprocating compressor is stopped, the high-stage compressor is disadvantageous in terms of cost and reliability. The present invention provides an operation control device that can start a multistage gas reciprocating compressor without load without installing a conventional suction valve open type unloader.
すなわち、本発明は、多段ガス往復動圧縮機の
低段側圧縮機と高段側圧縮機とをそれぞれ別々に
駆動できるように駆動機を取り付け、前記高段側
圧縮機の吐出弁からガス出口弁を経て吐出ガスを
外部へ送出できるように配管し、前記吐出弁と前
記ガス出口弁との間の配管から膨張タンク入口弁
を経て膨張タンクへ配管し、膨張タンクからガス
入口弁と前記低段側圧縮機の吸入弁との間の配管
まで配管して、前記多段ガス往復動圧縮機の運転
を停止する際には、前記低段側圧縮機の運転を停
止した後に一定時間だけ前記高段側圧縮機の運転
を継続して、機内残留ガスをさらに吐出ガスとし
て前記ガス出口弁から外部に送出した後に、前記
高段側圧縮機の運転を停止すると共に前記ガス出
口弁を閉じて前記膨張タンク入口弁を開くことが
できるようにして、前記多段ガス往復動圧縮機の
運転を開始する際に、前記低段側圧縮機及び前記
高段側圧縮機を同時に無負荷で起動することがで
きるようにしたことを特徴とする多段ガス往復動
圧縮機の運転制御装置を提供する。 That is, the present invention provides a multi-stage gas reciprocating compressor in which a drive unit is installed so that a low-stage compressor and a high-stage compressor can be driven separately, and a gas outlet is connected from a discharge valve of the high-stage compressor. Piping is provided so that the discharged gas can be sent to the outside through a valve, and piping is provided between the discharge valve and the gas outlet valve to the expansion tank via the expansion tank inlet valve, and from the expansion tank to the gas inlet valve and the lower When stopping the operation of the multi-stage gas reciprocating compressor by installing piping between the suction valve of the stage side compressor, the high-speed After continuing the operation of the stage side compressor and sending out the residual gas in the machine as discharge gas to the outside from the gas outlet valve, the operation of the high stage side compressor is stopped and the gas outlet valve is closed. The expansion tank inlet valve can be opened, and when starting the operation of the multi-stage gas reciprocating compressor, the low-stage compressor and the high-stage compressor can be started simultaneously with no load. To provide an operation control device for a multi-stage gas reciprocating compressor, which is characterized by being able to perform the following functions.
本発明において、低段側圧縮機とは、多段ガス
往復動圧縮機における第１段圧縮機、又は第１段
圧縮機を含む複数段の圧縮機をいい、最終段圧縮
機は除かれる。また、高段側圧縮機とは、多段ガ
ス往復動圧縮機における最終段圧縮機、又は最終
段を含む複数段の圧縮機をいい、第１段圧縮機は
除かれる。 In the present invention, the low stage compressor refers to a first stage compressor in a multistage gas reciprocating compressor, or a multiple stage compressor including the first stage compressor, and excludes the final stage compressor. Further, the term "high stage compressor" refers to the final stage compressor in a multistage gas reciprocating compressor, or a multiple stage compressor including the final stage, and excludes the first stage compressor.
本発明の実施例を図面により以下に説明する。 Embodiments of the present invention will be described below with reference to the drawings.
１０は多段ガス往復動圧縮機で、低段側圧縮機
１１と高段側圧縮機１２とをそれぞれ別々に駆動
する駆動電動機１１０及び１２０が取りつけら
れ、タイマ１３によつて低段側圧縮機１１の駆動
電動機１１０の運転を停止したのち、一定時間
（例えば30秒）後、高段側圧縮機１２の駆動電動
機１２０の運転が停止できるようにされている。 10 is a multi-stage gas reciprocating compressor, and drive motors 110 and 120 are attached to drive the low-stage compressor 11 and the high-stage compressor 12 separately. After the operation of the drive motor 110 of the high-stage compressor 12 is stopped, the operation of the drive motor 120 of the high-stage compressor 12 can be stopped after a certain period of time (for example, 30 seconds).
また、ガス入口弁（逆止弁）３１と低段側圧縮
機１１の吸入弁１１１との間、低段側圧縮機１１
の吐出弁１１２と高段側圧縮機１２の吸入弁１２
１との間、及び高段側圧縮機１２の吐出弁１２２
とガス出口弁３２との間は、配管によつて連通し
ている。 Further, between the gas inlet valve (check valve) 31 and the suction valve 111 of the low stage compressor 11, the low stage compressor 11
The discharge valve 112 of the high-stage compressor 12 and the suction valve 12 of the high-stage compressor 12
1 and the discharge valve 122 of the high-stage compressor 12
and the gas outlet valve 32 are communicated via piping.
４０は膨張タンクで、高段側圧縮機１２の吐出
弁１２２からガス出口弁３２を経て吐出ガスを外
部に送出している配管の前記吐出弁１２２と前記
ガス出口弁３２との間から分岐された配管と膨張
タンク入口弁４１を経て連通し、また、膨張タン
ク４０は低段側圧縮機１１の吸入弁１１１と、ガ
ス入口弁（逆止弁）３１との間の配管から分岐し
た配管によつて連通している。膨張タンク入口弁
４１は、励磁により閉じ無励磁により開く電磁弁
４２を介して送入される計装空気により作動する
が、電磁弁４２は、高段側圧縮機１２の駆動電動
機１２０の起動により通電されて励磁され、電動
機１２０の停止により非通電となつて無励磁とな
る。ガス出口弁３２は、励磁により閉り、無励磁
により開く電磁弁３３を介して送入される計装空
気により作動するが、電磁弁３３は電動機１２０
の起動により非通電となつて無励磁となり、電動
機１２０の停止により通電されて励磁される。圧
力スイツチPSHは、高段側圧縮機１２の吐出弁
１２２とガス出口弁３２との間の配管途上に設置
され、一定圧力（例えば150Kg／cm2）以上の吐出
圧力の場合に低段側圧縮機１１の駆動電動機１１
０を停止させるものであり、引続いてタイマ１３
により一定時間後、高段側圧縮機１２の駆動電動
機１２０が停止するものである。 Reference numeral 40 denotes an expansion tank, which is branched from between the discharge valve 122 and the gas outlet valve 32 of a pipe that sends discharged gas to the outside from the discharge valve 122 of the high-stage compressor 12 via the gas outlet valve 32. The expansion tank 40 is connected to a pipe branched from a pipe between the suction valve 111 of the low-stage compressor 11 and the gas inlet valve (check valve) 31. It is connected in a twisted manner. The expansion tank inlet valve 41 is operated by instrumentation air sent through a solenoid valve 42 that closes when energized and opens when not energized. It is energized and excited, and when the electric motor 120 stops, it is de-energized and becomes non-excited. The gas outlet valve 32 is operated by instrumentation air fed through a solenoid valve 33 that closes when energized and opens when not energized.
When the electric motor 120 is started, it is de-energized and becomes non-excited, and when the motor 120 is stopped, it is energized and energized. The pressure switch PSH is installed in the piping between the discharge valve 122 of the high-stage compressor 12 and the gas outlet valve 32, and switches the pressure switch to the low-stage compressor when the discharge pressure is higher than a certain pressure (for example, 150 kg/cm 2 ). Drive motor 11 of machine 11
0, and subsequently the timer 13
After a certain period of time, the drive motor 120 of the high-stage compressor 12 is stopped.
多段ガス往復動圧縮機１０の運転を停止する際
には、低段側圧縮機１１の駆動電動機１１０の運
転を停止したのち、一定時間高段側圧縮機１２の
駆動電動機１２０の運転が継続され、その間、膨
張タンク入口弁４１は閉り、ガス出口弁３２は開
いているので、高段側圧縮機１２内の残留ガスは
圧縮されて吐出ガスとしてガス出口弁３２を経て
外部に吐出される。高段ガス圧縮機１２の駆動電
動機１２０が停止すると、ガス出口弁３２は閉
り、膨張タンク入口弁４１が開いて高段ガス圧縮
機１２内の更に残つたガスが膨張タンク４０に流
入し、膨張して低圧力のガスとなるが、このガス
量は小量であるので膨張タンク４０は小さくてよ
く、また、膨張タンク４０から低段側圧縮機１１
の吸入弁１１１に流入するガス圧は極めて低く、
ガス圧力は、ガス入口弁３１からガス出口弁３２
まで、その間は低圧力かつ均圧となる。 When stopping the operation of the multistage gas reciprocating compressor 10, after stopping the operation of the drive motor 110 of the low stage compressor 11, the operation of the drive motor 120 of the high stage compressor 12 is continued for a certain period of time. During this period, the expansion tank inlet valve 41 is closed and the gas outlet valve 32 is open, so the residual gas in the high-stage compressor 12 is compressed and discharged to the outside via the gas outlet valve 32 as discharge gas. . When the drive motor 120 of the high-stage gas compressor 12 stops, the gas outlet valve 32 closes and the expansion tank inlet valve 41 opens, allowing the remaining gas in the high-stage gas compressor 12 to flow into the expansion tank 40. The gas expands and becomes a low-pressure gas, but since the amount of this gas is small, the expansion tank 40 may be small.
The gas pressure flowing into the suction valve 111 is extremely low;
The gas pressure is changed from the gas inlet valve 31 to the gas outlet valve 32.
Until then, the pressure remains low and equal.
従つて、多段ガス往復動圧縮機１０の起動の際
には、低段側圧縮機１１及び高段側圧縮機１２を
無負荷に近い状態で同時に起動することができ
る。 Therefore, when starting the multi-stage gas reciprocating compressor 10, the low-stage compressor 11 and the high-stage compressor 12 can be started simultaneously in a nearly no-load state.
図面には、前述の実施例に対して選択的に設け
ることができる装置として、低段側圧縮機１１の
吸入弁１１１に取り付けた吸入弁開放型アンロー
ダ２０と、電磁弁２１と、圧力スイツチPS１及
びPS２とが示されているので、これらについて
説明を補足する。 The drawing shows a suction valve opening type unloader 20 attached to the suction valve 111 of the low-stage compressor 11, a solenoid valve 21, and a pressure switch PS1 as devices that can be selectively provided with respect to the above-described embodiment. and PS2 are shown, so a supplementary explanation will be provided regarding these.
低段側圧縮機１１の吸入弁１１１に取りつけら
れた吸入弁開放型アンローダ２０は、低段側圧縮
機１１の吸入圧力又は吐出圧力が一定圧力以上に
なると、吸入弁１１１を強制的に開放する装置で
ある。すなわち、アンローダ２０は、励磁により
閉まり、無励磁により開く電磁弁２１を経て送入
される計装空気により作動し、ガス入口弁（逆止
弁）３１の出口と低段側圧縮機１１の吸入弁１１
１との間の配管途上に設置された圧力スイツチ
PS１は、低段側圧縮機１１の吸入圧力が一定圧
力（例えば3.5Kg／cm2）以上になると、前記電磁
弁回路を開路して電磁弁２１の励磁を解き、一定
圧力（例えば３Kg／cm2）以下になると、前記電磁
弁回路を閉路して電磁弁２１を励磁するもので、
低段側圧縮機１１の吐出弁１１２と高段側圧縮機
１２の吸入弁１２１との間の配管途上に設置され
た圧力スイツチPS２は、低段側圧縮機１１の吐
出圧力が一定圧力（例えば６Kg／cm2）以上になる
と、前記電磁弁回路を開路して電磁弁２１の励磁
を解き、一定圧力（例えば5.4Kg／cm2）以下にな
ると、前記電磁弁回路を閉路して電磁弁２１を励
磁するものである。 The suction valve opening type unloader 20 attached to the suction valve 111 of the low stage compressor 11 forcibly opens the suction valve 111 when the suction pressure or discharge pressure of the low stage compressor 11 exceeds a certain pressure. It is a device. That is, the unloader 20 is operated by instrument air fed through a solenoid valve 21 that closes when energized and opens when not energized, and connects the outlet of the gas inlet valve (check valve) 31 and the intake of the low-stage compressor 11. valve 11
Pressure switch installed in the piping between 1 and
When the suction pressure of the low-stage compressor 11 becomes equal to or higher than a certain pressure (for example, 3.5 kg/cm 2 ), the PS 1 opens the electromagnetic valve circuit to release the excitation of the electromagnetic valve 21 , and presses the 2 ) When the following occurs, the solenoid valve circuit is closed and the solenoid valve 21 is energized,
A pressure switch PS2 installed in the piping between the discharge valve 112 of the low-stage compressor 11 and the suction valve 121 of the high-stage compressor 12 keeps the discharge pressure of the low-stage compressor 11 at a constant pressure (for example, When the pressure exceeds 6Kg/cm 2 ), the solenoid valve circuit is opened and the solenoid valve 21 is deenergized, and when the pressure is below a certain level (for example, 5.4Kg/cm 2 ), the solenoid valve circuit is closed and the solenoid valve 21 is deenergized. It is used to excite.
従つて、低段側圧縮機１１の吸入圧力が少しで
も高くなると、圧力スイツチPS１がこれを検知
して、アンローダ２０が作動し、強制的に吸入弁
１１１を開き低段側圧縮機１１を無負荷運転状態
にすることができる。 Therefore, when the suction pressure of the low-stage compressor 11 increases even a little, the pressure switch PS1 detects this and the unloader 20 operates, forcibly opening the suction valve 111 and disabling the low-stage compressor 11. It can be put into load operation state.
また、経年変化により高圧多段ガス圧縮機は高
段側圧縮機ほどピストンリングの摩耗が大きく洩
れ量も大きくなり（高段側から低段側へ洩れる）
中間段における圧縮機の圧力が異常上昇する場合
があるが、この場合に、低段側圧縮機の吐出圧力
が異常上昇すると、圧力スイツチPS２がこれを
検知して、アンローダ２０が作動し、強制的に吸
入弁１１１を開いて、低段側圧縮機１１を無負荷
運転状態として中間段圧力を下げ、高段側圧縮機
１２だけ負荷運転できるものである。 In addition, due to aging, in high-pressure multi-stage gas compressors, the higher the stage compressor, the greater the piston ring wear and the greater the amount of leakage (leakage from the higher stage side to the lower stage side).
The pressure of the compressor in the intermediate stage may rise abnormally. In this case, if the discharge pressure of the lower stage compressor rises abnormally, the pressure switch PS2 detects this and the unloader 20 operates to force the In this case, the suction valve 111 is opened, the lower stage compressor 11 is placed in a no-load operating state, and the intermediate stage pressure is lowered, so that only the higher stage compressor 12 can be operated under load.
図面は本発明の実施例を説明する略図である。
１０…多段ガス往復動圧縮機、１１…低段側圧
縮機、１１０…同上駆動電動機、１１１…同上吸
入弁、１１２…同上吐出弁、１２…高段側圧縮
機、１２０…同上駆動電動機、１２１…同上吸入
弁、１２２…同上吐出弁、３１…ガス入口弁、３
２…ガス出口弁、４０…膨張タンク、４１…膨張
タンク入口弁。
The drawings are schematic diagrams illustrating embodiments of the invention. DESCRIPTION OF SYMBOLS 10... Multi-stage gas reciprocating compressor, 11... Low stage side compressor, 110... Same as above drive motor, 111... Same as above suction valve, 112... Same as above discharge valve, 12... High stage side compressor, 120... Same as above drive motor, 121 ...Suction valve as above, 122...Discharge valve as above, 31...Gas inlet valve, 3
2... Gas outlet valve, 40... Expansion tank, 41... Expansion tank inlet valve.
Claims (1)
側圧縮機とをそれぞれ別々に駆動できるように駆
動機を取り付け、前記高段側圧縮機の吐出弁から
ガス出口弁を経て吐出ガスを外部へ送出できるよ
うに配管し、前記吐出弁と前記ガス出口弁との間
の配管から膨張タンク入口弁を経て膨張タンクへ
配管し、膨張タンクからガス入口弁と前記低段側
圧縮機の吸入弁との間の配管まで配管して、前記
多段ガス往復動圧縮機の運転を停止する際には、
前記低段側圧縮機の運転を停止した後に一定時間
だけ前記高段側圧縮機の運転を継続して、機内残
留ガスをさらに吐出ガスとして前記ガス出口弁か
ら外部に送出した後に、前記高段側圧縮機の運転
を停止すると共に前記ガス出口弁を閉じて前記膨
張タンク入口弁を開くことができるようにして、
前記多段ガス往復動圧縮機の運転を開始する際
に、前記低段側圧縮機及び前記高段側圧縮機を同
時に無負荷で起動することができるようにしたこ
とを特徴とする多段ガス往復動圧縮機の運転制御
装置。1. A driver is installed so that the low-stage compressor and the high-stage compressor of the multi-stage gas reciprocating compressor can be driven separately, and the discharged gas is passed from the discharge valve of the high-stage compressor to the gas outlet valve. from the expansion tank through the expansion tank inlet valve, and from the expansion tank to the gas inlet valve and the low-stage compressor. When stopping the operation of the multistage gas reciprocating compressor by installing piping to the suction valve,
After the operation of the low-stage compressor is stopped, the operation of the high-stage compressor is continued for a certain period of time, and residual gas in the machine is further sent out from the gas outlet valve as discharge gas, and then the high-stage compressor is stopping operation of the side compressor and closing the gas outlet valve so that the expansion tank inlet valve can be opened;
The multi-stage gas reciprocating compressor is characterized in that, when starting the operation of the multi-stage gas reciprocating compressor, the low-stage compressor and the high-stage compressor can be started simultaneously with no load. Compressor operation control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56144428A JPS5847188A (en) | 1981-09-12 | 1981-09-12 | Apparatus for controlling operation of multiple stage gas compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56144428A JPS5847188A (en) | 1981-09-12 | 1981-09-12 | Apparatus for controlling operation of multiple stage gas compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5847188A JPS5847188A (en) | 1983-03-18 |
| JPH0143156B2 true JPH0143156B2 (en) | 1989-09-19 |
Family
ID=15361959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56144428A Granted JPS5847188A (en) | 1981-09-12 | 1981-09-12 | Apparatus for controlling operation of multiple stage gas compressor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5847188A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7092649B2 (en) * | 2018-11-29 | 2022-06-28 | 大陽日酸株式会社 | How to operate the multi-stage high-pressure gas compressor, multi-stage high-pressure gas compressor |
-
1981
- 1981-09-12 JP JP56144428A patent/JPS5847188A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5847188A (en) | 1983-03-18 |
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