JPS6223590A - Reverse thrust preventing apparatus for screw expansion machine - Google Patents
Reverse thrust preventing apparatus for screw expansion machineInfo
- Publication number
- JPS6223590A JPS6223590A JP16357685A JP16357685A JPS6223590A JP S6223590 A JPS6223590 A JP S6223590A JP 16357685 A JP16357685 A JP 16357685A JP 16357685 A JP16357685 A JP 16357685A JP S6223590 A JPS6223590 A JP S6223590A
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- reverse thrust
- pressure
- control valve
- gap
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/10—Purpose of the control system
- F05B2270/109—Purpose of the control system to prolong engine life
- F05B2270/1097—Purpose of the control system to prolong engine life by preventing reverse rotation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、スクリュー膨張機の逆スラスト防止装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reverse thrust prevention device for a screw expander.
従来、スクリュー膨張機において起動時や停止時に発生
する逆スラストを防止する装置を設けたものについては
知られていない。Conventionally, there has been no known screw expander equipped with a device for preventing reverse thrust that occurs when starting or stopping.
一方、スクリュー圧縮機においては、第２図に示すよう
に、ロータ２１に吐出口２３側から吸入口２２側に向か
ってガス圧力差により大きなスラスト力２４が作用し、
スラスト軸受に過大なスラスト力が作用する。そのため
、ロータ軸２５に装着したピストン２６を構成要素とす
るシリンダ装置２７を設け、ピストン２６の両側に形成
された吸入側と吐出側の室の内、吸入側の室２８に対し
て圧力流体源２９からの油圧または圧縮ガスを供給する
ように構成し、これによって上記スラスト力を相殺して
軽減し、スラスト軸受の寿命を向上させるようにしたも
のが知られている。On the other hand, in a screw compressor, as shown in FIG. 2, a large thrust force 24 acts on the rotor 21 from the discharge port 23 side toward the suction port 22 side due to the gas pressure difference.
Excessive thrust force acts on the thrust bearing. Therefore, a cylinder device 27 is provided which has a piston 26 mounted on the rotor shaft 25 as a component, and a pressure fluid source is provided for the suction side chamber 28 of the suction side and discharge side chambers formed on both sides of the piston 26. It is known that the thrust bearing is configured to supply hydraulic pressure or compressed gas from 29, thereby offsetting and reducing the thrust force, thereby improving the life of the thrust bearing.
ところで、前記スクリュー膨張機では、起動時及び停止
時に容積形彫張機特有のスラスト逆転現象によって逆ス
ラスト力が発生する。即ち、起動時及び停止時の入口側
ガス圧の低下によって、膨張機内部では指圧線図に従っ
て所定の内部膨張比の分だけガスは膨張し背圧以下にい
ったん降圧した後、出口側ポート付近で背圧まで昇圧す
る。その結果、定常運転時において生じるスラスト力と
は逆方向の逆スラスト力が発生することになる。By the way, in the screw expander, a reverse thrust force is generated due to a thrust reversal phenomenon peculiar to a positive displacement expander when starting and stopping. In other words, due to the drop in inlet gas pressure at startup and stop, the gas expands inside the expander by a predetermined internal expansion ratio according to the finger pressure diagram, and after the pressure drops below the back pressure, the gas expands near the outlet port. Increase the pressure to back pressure. As a result, a reverse thrust force is generated in the opposite direction to the thrust force generated during steady operation.
しかるに、このようにスクリュー膨張機において起動時
及び停止時にのみ発生する逆スラスト力の防止装置に、
上記スクリュー圧縮機におけるスラスト力軽減装置をそ
のまま適用することは不可能である。However, in this way, there is a device to prevent reverse thrust force that occurs only when starting and stopping a screw expander.
It is impossible to apply the thrust force reduction device in the above-mentioned screw compressor as it is.
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、スクリュー膨張機の起動時及び停止時に
おける逆スラストの発生を防止し、逆スラストに起因す
るトラブルの発生を防止すること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, and prevents the occurrence of reverse thrust when starting and stopping a screw expander, thereby preventing the occurrence of troubles caused by reverse thrust. The purpose is to
本発明のスクリュー膨張機の逆スラスト防止装置は、ロ
ータの軸方向変位を検知するロータ位置検知装置を設け
、ロータ軸に装着されたピストンを構成要素とするシリ
ンダ装置を設けるとともに、このシリンダ装置のピスト
ン両側に形成された入口側の室と出口側の室の少なくと
もいずれか一方の室の圧力を前記ロータ位置検知装置か
らの信号により制御する制御弁を設け、起動時や停止時
に逆スラストが生じてロータが軸方向に変位するとこれ
を検知して制御弁を作動させ、逆スラストに対向する力
を作用させ、ロータの変位によるトラブルの発生を防止
するようにしたことを特徴とするものである。The reverse thrust prevention device for a screw expander of the present invention is provided with a rotor position detection device that detects the axial displacement of the rotor, a cylinder device whose component is a piston attached to the rotor shaft, and a cylinder device with a piston mounted on the rotor shaft. A control valve is provided to control the pressure in at least one of the inlet-side chamber and the outlet-side chamber formed on both sides of the piston by a signal from the rotor position detection device, and reverse thrust occurs when starting or stopping. When the rotor is displaced in the axial direction, this is detected and the control valve is actuated to apply an opposing force to the reverse thrust, thereby preventing trouble from occurring due to rotor displacement. .
以下、本発明の一実施例を第１図に基づいて説明する。 An embodiment of the present invention will be described below with reference to FIG.
ロータ１の両端部に入口２と出口３が配設され、このロ
ータ１から両側に延出されたロータ軸１ａ・１ｂが図示
しないラジアル軸受とスラスト軸受４にて回転自在に支
持されている。一方のロータ軸１ａの一端にはピストン
５が装着され、このピストン５を構成要素とするシリン
ダ装置６が設けられている。このシリンダ装置６のピス
トン５両側に形成された出口側と入口側の室７・８の内
、出口側の室７には油圧または高圧ガス等の圧力流体源
９から開閉制御弁１０を介して圧力流体を供給し得るよ
うに構成されている。また、入口側の室８には油タンク
１１から給油ポンプ１２にて油圧が供給されるとともに
、前記給油ポンプ１２に圧力制御弁１３を備えたバイパ
ス路１４を設けて供給油圧を調節可能に構成されている
。An inlet 2 and an outlet 3 are provided at both ends of the rotor 1, and rotor shafts 1a and 1b extending from the rotor 1 on both sides are rotatably supported by a radial bearing and a thrust bearing 4 (not shown). A piston 5 is attached to one end of one rotor shaft 1a, and a cylinder device 6 having this piston 5 as a component is provided. Of the chambers 7 and 8 on the outlet side and inlet side formed on both sides of the piston 5 of this cylinder device 6, the outlet side chamber 7 is connected to a pressure fluid source 9 such as hydraulic pressure or high pressure gas via an on-off control valve 10. It is configured to be able to supply pressure fluid. In addition, oil pressure is supplied to the chamber 8 on the inlet side from an oil tank 11 by an oil supply pump 12, and the oil supply pump 12 is provided with a bypass passage 14 equipped with a pressure control valve 13 so that the supplied oil pressure can be adjusted. has been done.
他方のロータ軸１ｂにはロータ１の移動を検出するため
の検出カラー１５が装着され、この検出カラー１５と一
定間隙ΔＳを設けて膨張機のケーシングに間隙検出器１
６が配設されている。これら検出カラー１５と間隙検出
器Ｉ６にてロータ位置検知装置が構成されている。前記
間隙検出器１６は、検出した間隙量が所定値を越えると
、調節器１７に信号を出力するように構成され、さらに
この調節器１７から前記開閉制御弁１ｏ及び圧力制御弁
１３に制御信号を出力するように構成されている。A detection collar 15 for detecting movement of the rotor 1 is attached to the other rotor shaft 1b, and a constant gap ΔS is provided between the detection collar 15 and the gap detector 1 on the expander casing.
6 are arranged. These detection collars 15 and gap detector I6 constitute a rotor position detection device. The gap detector 16 is configured to output a signal to a regulator 17 when the detected gap exceeds a predetermined value, and further outputs a control signal from the regulator 17 to the opening/closing control valve 1o and the pressure control valve 13. is configured to output.
以上の構成において、スクリュー膨張機の通常運転中は
入口２側の圧力が高く、出口３側の圧力が低いため、ロ
ータ１には入口側から出口側に向かってスラスト力１８
が作用し、そのスラスト力はスラスト軸受４にて支持さ
れている。また、このスラスト力１８を軽減するために
、シリンダ装置６の出口側の室７に圧力流体源９から開
閉制御弁１０を介して調節された油圧が供給され、前記
スラスト力１８に対向してこれを相殺する力がロータ１
に作用している。In the above configuration, during normal operation of the screw expander, the pressure on the inlet 2 side is high and the pressure on the outlet 3 side is low, so the rotor 1 has a thrust force of 18 from the inlet side to the outlet side.
acts, and the thrust force is supported by the thrust bearing 4. In addition, in order to reduce this thrust force 18, regulated hydraulic pressure is supplied from a pressure fluid source 9 to the chamber 7 on the outlet side of the cylinder device 6 via an on-off control valve 10 to counteract the thrust force 18. The force that offsets this is the rotor 1
It is acting on
一方、スクリュー膨張機の起動時や停止時にはロータ１
に逆方向のスラスト力１９が作用する。On the other hand, when starting or stopping the screw expander, the rotor 1
A thrust force 19 in the opposite direction acts on.
そのため、ロータ１が逆スラスト方向に移動すると、検
出カラー１５と間隙検出器１６の間の間隙ΔＳが変化し
、その変化量が間隙検出器１６にて検出される。この間
隙ΔＳの変化量が、ロータ１の端面やロータ１同志の接
触を生ずるような限界値に達する前に、間隙検出器１６
から調節器１７に信号が出され、この調節器１７から開
閉制御弁１０及び圧力制御弁１３に制御信号が出力され
、開閉制御弁１０又は圧力制御弁１３が制御され、シリ
ンダ装置６の出口側の室７に供給される圧力流体の圧力
が降圧されるか、あるいは、入口側の室８に供給される
油の圧力が昇圧される。これによって、ロータ１が逆ス
ラスト方向に対向する方向に押圧され、ロータ１に逆ス
ラスト力が作用するのを防止するとともにロータ１の移
動が規制され、ロータ１の接触等によるトラブルの発生
が防止される。Therefore, when the rotor 1 moves in the reverse thrust direction, the gap ΔS between the detection collar 15 and the gap detector 16 changes, and the amount of change is detected by the gap detector 16. Before the amount of change in the gap ΔS reaches a limit value that causes contact between the end faces of the rotor 1 or between the rotors 1, the gap detector 16
A signal is output from the regulator 17 to the regulator 17, a control signal is output from the regulator 17 to the on-off control valve 10 and the pressure control valve 13, the on-off control valve 10 or the pressure control valve 13 is controlled, and the outlet side of the cylinder device 6 is controlled. The pressure of the pressurized fluid supplied to the chamber 7 is lowered, or the pressure of the oil supplied to the chamber 8 on the inlet side is increased. As a result, the rotor 1 is pressed in a direction opposite to the reverse thrust direction, preventing reverse thrust force from acting on the rotor 1, and restricting the movement of the rotor 1, thereby preventing troubles caused by contact of the rotor 1, etc. be done.
尚、上記実施例では給油ポンプ１２を用いたものを例示
したが、ガス圧を用いてもよい。又、シリンダ装置６の
両側の室の出口側の室７に圧力流体を供給するとともに
入口側の室８の圧力を昇圧するようにしたものを例示し
たが、単に出口側の室７に圧力流体を供給し、その圧力
流体の圧力を降圧するだけでもよい。In the above embodiment, the oil supply pump 12 was used, but gas pressure may also be used. In addition, although pressure fluid is supplied to the chamber 7 on the outlet side of the chambers on both sides of the cylinder device 6 and the pressure in the chamber 8 on the inlet side is increased, the pressure fluid is simply supplied to the chamber 7 on the outlet side. It is also possible to simply supply the pressure fluid and reduce the pressure of the pressure fluid.
本発明のスクリュー膨張機の逆スラスト防止装置によれ
ば、以上のようにロータの軸方向変位を検知するロータ
位置検知装置とロータ軸を軸方向に押圧するシリンダ装
置を設け、このシリンダ装置のピストン両側の室の少な
（ともいずれか一方の室の圧力を、前記ロータ位置検知
装置からの信号により作動する制御弁で制御するように
しているので、起動時や停止時に逆スラストが生じてロ
ータが軸方向に変位すると、制御弁が作動して逆スラス
トに対向する力が作用するため、ロータの変位によるト
ラブルの発生を確実に防止することができるという効果
を奏する。According to the reverse thrust prevention device for a screw expander of the present invention, the rotor position detection device that detects the axial displacement of the rotor and the cylinder device that presses the rotor shaft in the axial direction are provided as described above, and the piston of the cylinder device is provided. Since the pressure in one of the two chambers is controlled by a control valve that is activated by a signal from the rotor position detection device, reverse thrust occurs when starting or stopping, and the rotor is When the rotor is displaced in the axial direction, the control valve is actuated and a force opposing the reverse thrust is applied, so that troubles caused by displacement of the rotor can be reliably prevented.
第１図は本発明の一実施例の構成図、第２図は従来例の
概略構成図である。
１はロータ、５はピストン、６はシリンダ装置、７・８
は室、９は圧力流体源、１０は開閉制御弁、１２は給油
ポンプ、１３は圧力制御弁、１５は検出カラー、１６は
間隙検出器、１７は調節器、１９は逆スラスト力である
。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a conventional example. 1 is a rotor, 5 is a piston, 6 is a cylinder device, 7 and 8
1 is a chamber, 9 is a pressure fluid source, 10 is an opening/closing control valve, 12 is an oil supply pump, 13 is a pressure control valve, 15 is a detection collar, 16 is a gap detector, 17 is a regulator, and 19 is a reverse thrust force.
Claims (1)
を設け、ロータ軸に装着されたピストンを構成要素とす
るシリンダ装置を設けるとともに、このシリンダ装置の
ピストン両側に形成された入口側の室と出口側の室の少
なくともいずれか一方の室の圧力を前記ロータ位置検知
装置からの信号により制御する制御弁を設けたことを特
徴とするスクリュー膨張機の逆スラスト防止装置。1. A rotor position detection device for detecting the axial position of the rotor is provided, and a cylinder device whose component is a piston attached to the rotor shaft is provided, and an inlet side chamber formed on both sides of the piston of this cylinder device. A reverse thrust prevention device for a screw expander, comprising a control valve that controls the pressure of at least one of the chambers on the outlet side based on a signal from the rotor position detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16357685A JPS6223590A (en) | 1985-07-24 | 1985-07-24 | Reverse thrust preventing apparatus for screw expansion machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16357685A JPS6223590A (en) | 1985-07-24 | 1985-07-24 | Reverse thrust preventing apparatus for screw expansion machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6223590A true JPS6223590A (en) | 1987-01-31 |
Family
ID=15776533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16357685A Pending JPS6223590A (en) | 1985-07-24 | 1985-07-24 | Reverse thrust preventing apparatus for screw expansion machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6223590A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5123822A (en) * | 1990-06-30 | 1992-06-23 | Kabushiki Kaisha Kobe Seiko Sho | Screw compressor with spacer to prevent movement of volume adjusting valve |
| GB2442830A (en) * | 2007-09-05 | 2008-04-16 | Grasso Gmbh Refrigeration Tech | Screw Compressor with Axial thrust Balancing Device |
| DE102006021703B4 (en) * | 2006-05-10 | 2018-01-04 | Gea Refrigeration Germany Gmbh | Oil-immersed screw compressor with axial force relief |
| WO2019183262A1 (en) * | 2018-03-21 | 2019-09-26 | Johnson Controls Technology Company | Systems and methods for enhanced compressor bearing life |
-
1985
- 1985-07-24 JP JP16357685A patent/JPS6223590A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5123822A (en) * | 1990-06-30 | 1992-06-23 | Kabushiki Kaisha Kobe Seiko Sho | Screw compressor with spacer to prevent movement of volume adjusting valve |
| DE102006021703B4 (en) * | 2006-05-10 | 2018-01-04 | Gea Refrigeration Germany Gmbh | Oil-immersed screw compressor with axial force relief |
| GB2442830A (en) * | 2007-09-05 | 2008-04-16 | Grasso Gmbh Refrigeration Tech | Screw Compressor with Axial thrust Balancing Device |
| WO2019183262A1 (en) * | 2018-03-21 | 2019-09-26 | Johnson Controls Technology Company | Systems and methods for enhanced compressor bearing life |
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