JPS59119089A - Capacity controlling apparatus for nitrogen compressor - Google Patents
Capacity controlling apparatus for nitrogen compressorInfo
- Publication number
- JPS59119089A JPS59119089A JP22608382A JP22608382A JPS59119089A JP S59119089 A JPS59119089 A JP S59119089A JP 22608382 A JP22608382 A JP 22608382A JP 22608382 A JP22608382 A JP 22608382A JP S59119089 A JPS59119089 A JP S59119089A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control valve
- check valve
- valve
- 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.)
- 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
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C28/26—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (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】
〔発明の利用分野〕
本発明はスクリュー圧縮機などの窒素圧縮機における容
量制御装置に関するものでらる。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a capacity control device for a nitrogen compressor such as a screw compressor.
゛ オイルフリースクリユー圧縮機などは空気圧縮機に
用いられる場合、０ＮＮ−ＯＦＦ’の２ステツプ制御が
一般的に行われている。第１図にその系統図を示す。圧
縮機１の仕様吐出圧力Ｐ３を例えば７．０匂／ｃＩＩＬ
Ｇとした場合、圧力Ｐ３が第２図に示すように例えば７
．２ｋＣｙ／ａｔｌＧに達したとき、圧力スイッチ２か
ら信号が大気放出弁３および吸入弁４に送られ、吸入弁
４を閉、大気放出弁３を開とする。従って第３図に示す
ように逆止弁５の上流側における吐出配管６内圧力Ｐ２
は大気圧とな９、空気の圧送は行な“われない。このた
め、逆止弁５下流の吐出配管６内圧力Ｐ３は低下し、例
えば６．７〜／ｃｎｌＧに達した時、圧力スイッチ２か
ら信号が送ら扛て吸入弁４が開、大気放出弁３が閉とな
ｐ１空気の圧送金再び開始する。これを繰ｐ返すことに
よシ、圧送流量を調節することができる。第３図に示す
時間Ｔ１とＴ２の関係により・圧送流量が決まシ、での
時の軸動力を第４図のＡ点で表わすことが可能である。``When an oil-free screw compressor is used as an air compressor, two-step control of 0NN-OFF' is generally performed. Figure 1 shows the system diagram. For example, the specified discharge pressure P3 of the compressor 1 is 7.0 odor/cIIL.
G, the pressure P3 is, for example, 7 as shown in Figure 2.
．． When the pressure reaches 2 kCy/atlG, a signal is sent from the pressure switch 2 to the atmosphere release valve 3 and the suction valve 4 to close the suction valve 4 and open the atmosphere release valve 3. Therefore, as shown in FIG. 3, the pressure inside the discharge pipe 6 on the upstream side of the check valve 5 is P2.
becomes atmospheric pressure 9, and air is not fed under pressure. Therefore, the pressure P3 inside the discharge pipe 6 downstream of the check valve 5 decreases, and when it reaches, for example, 6.7~/cnlG, the pressure switch A signal is sent from 2 to open the suction valve 4, close the atmospheric release valve 3, and restart the pressure transfer of air.By repeating this process, the flow rate can be adjusted. The shaft power when the pumping flow rate is determined by the relationship between times T1 and T2 shown in FIG. 3 can be expressed by point A in FIG. 4.
この０ＮＮ−ＯＦ’Ｆ制御を窒素圧縮機に用いた場合、
吸入弁４を閉としたとき、吸込配管７内の圧力Ｐ１が大
気圧力以下となシ、このため窒素ガス中に空気中の酸系
ガスが侵入して窒素の純度を低下させるという欠点があ
った。また、大気放出弁３を開として吐出配管６内圧力
Ｐ２を大気圧とした場合にも配管内に空気が侵入して窒
素ガスの純度を低下させるおそれがめった。このため窒
素圧縮機においては従来第５図に示すような容量制御装
置が使用されていた。これは圧力調節コントローラ８に
よシ、逆止弁５下流の吐出配管６内圧力Ｐ３が仕様圧力
の状態に一定に保たれるように圧力制御弁９の開度を調
節し、必要な童のみプラント側（逆上弁５の下流側）に
圧送し、余分な量はバイパス配管６ａから吸入側にバイ
パスするか大気に放出していた。When this 0NN-OF'F control is used for a nitrogen compressor,
When the suction valve 4 is closed, the pressure P1 in the suction pipe 7 must be below atmospheric pressure, which has the disadvantage that acid gases in the air enter the nitrogen gas and reduce the purity of the nitrogen. Ta. Further, even when the atmosphere release valve 3 is opened and the internal pressure P2 of the discharge pipe 6 is set to atmospheric pressure, there is a risk that air will enter the pipe and reduce the purity of the nitrogen gas. For this reason, a capacity control device as shown in FIG. 5 has conventionally been used in nitrogen compressors. This is done by the pressure adjustment controller 8, which adjusts the opening degree of the pressure control valve 9 so that the pressure P3 in the discharge pipe 6 downstream of the check valve 5 is kept constant at the specified pressure, and only the necessary It was fed under pressure to the plant side (downstream side of the reversal valve 5), and the excess amount was bypassed to the suction side from the bypass pipe 6a or released into the atmosphere.
これによれば圧送流量は制御されるが、吐出配管６の逆
止弁５上流側の圧力Ｐ２は常時高圧となっているため、
圧縮機の軸動力は第６図に示すように常に１００％の状
態で運転しつづけなければならないという欠点があった
。According to this, the pumping flow rate is controlled, but since the pressure P2 on the upstream side of the check valve 5 of the discharge pipe 6 is always high pressure,
The shaft power of the compressor had the disadvantage that it had to be constantly operated at 100% as shown in FIG.
゛ 〔発明の目的〕
本発明は、窒素ガスの純度低下を完全に防止でき、しか
も圧送流量の変化に応じて、圧縮機の軸動力を低下でき
るようにして省エネルギー化を計るようにしたことを目
的とするものである。゛ [Object of the Invention] The present invention is capable of completely preventing a decrease in the purity of nitrogen gas, and in addition, it is possible to reduce the shaft power of the compressor in accordance with changes in the pumping flow rate, thereby saving energy. This is the purpose.
本発明の特徴は、窒素圧縮機と、この窒素圧縮機の吐出
側に連通された逆止弁を備える吐出配管と、該吐出配管
の逆止弁上流側と圧縮機の吸込配管を連通ずるバイパス
配管と、該バイパス配管の途中に設けた制御弁とを備え
るものにおいて、前記制御弁は前記吐出配管内の圧力を
任意の値に調整できる圧力制御弁によシ構成し、かつ吐
出配管の逆止弁下流側の圧力を検出してその圧力が設定
値以上となったときに前記逆止弁上流側の吐出配管内圧
力を大気圧より若干高い圧力に調整するように前記制御
弁の開度を制御する制御器を設けた点にある。The present invention is characterized by a nitrogen compressor, a discharge pipe provided with a check valve that communicates with the discharge side of the nitrogen compressor, and a bypass that communicates the check valve upstream side of the discharge pipe with the suction pipe of the compressor. In the device comprising piping and a control valve provided in the middle of the bypass piping, the control valve is constituted by a pressure control valve that can adjust the pressure in the discharge piping to an arbitrary value, and The opening degree of the control valve is set such that when the pressure on the downstream side of the stop valve is detected and the pressure exceeds a set value, the pressure inside the discharge pipe on the upstream side of the check valve is adjusted to a pressure slightly higher than atmospheric pressure. The point is that a controller is provided to control the
本発明装置の一実施例ｔ−第７図〜第１０図により説明
する。図において第１図、第５図と同一符号のものは同
一または相当するものでめる。−圧力 ・Ｐ３が第８図
に示すように上限圧力ＰＨＫ達した時、圧力スイッチ１
０から制御器１１に信号カニ出される。制御器１１から
の信号によシ圧力制御弁１２は、圧力Ｐ２が大気圧よシ
若干尚い圧力、例えば０．１ Ｋｇ／ ｃｒｌの設定圧
力ＰＡとなるようにその開度を制御される。圧力Ｐ３が
下限圧力ＰＬになった場合にも圧力スイッチ１０から１
何１卸器１１に信号が発せられ、制御器１１から圧力制
御弁１２に信号が出されて圧力制御ａ１弁１２を閉とす
る。従って、プラント側に圧送される流量は第９図の時
間Ｔ、トＴｚ ｆ）１□ア決０、エユ、□。。１、ある
。An embodiment of the apparatus of the present invention will be described with reference to FIGS. 7 to 10. In the figures, the same reference numerals as in FIGS. 1 and 5 are the same or equivalent. -Pressure ・When P3 reaches the upper limit pressure PHK as shown in Figure 8, pressure switch 1
A signal is output from 0 to the controller 11. The opening degree of the pressure control valve 12 is controlled by a signal from the controller 11 so that the pressure P2 becomes a pressure slightly higher than atmospheric pressure, for example, a set pressure PA of 0.1 Kg/crl. Even when the pressure P3 reaches the lower limit pressure PL, the pressure switches 10 to 1
A signal is sent to the regulator 11, and a signal is sent from the controller 11 to the pressure control valve 12 to close the pressure control a1 valve 12. Therefore, the flow rate pumped to the plant side is as shown in FIG. . 1. Yes.
２
第１０図において、１００％圧送時の軸動力は１０００
時には軸動力はＸ％となり、従来の制御方式に比べて、
（１００−Ｘ）％（図のＥで示す量）だけ省エネルギー
となる。2 In Figure 10, the shaft power at 100% pressure is 1000
Sometimes the shaft power is X%, compared to the conventional control method.
Energy is saved by (100-X)% (the amount indicated by E in the figure).
次に、不発明の他の実施例を第１１図によシ説、明する
。圧縮機の仕様吐出圧力を例えば７に９々船とする。圧
力スイッチ１０の上限値ＰＨを７．２〜／ ｃｖｉ Ｇ
、下限値Ｐ Ｌ ’ｋ ６．７ ｈ／ ｃｒｌＩＧと
する。圧力Ｐ３が７，２匂／ ｃｒｉｌ Ｇ ｉｃなる
と、圧力スイッチ１０からの信号が制御器１１に入υ、
それに備えられた信号切換器によシコントローラ１３が
作動する。Next, another embodiment of the invention will be explained and explained with reference to FIG. Let us assume that the specified discharge pressure of the compressor is, for example, 7 to 9. Set the upper limit PH of the pressure switch 10 to 7.2~/cvi G
, the lower limit value PL'k is 6.7 h/crlIG. When the pressure P3 reaches 7.2 g/c, a signal from the pressure switch 10 enters the controller 11.
The controller 13 is operated by a signal switch provided therein.
コントローラ１３の設定値がＩＫｇ／ｃｎｉＧとすると
、圧力制御弁１２の開度が制御されて圧力Ｐ２の圧力を
ＩｋＣＩ／Ｃ４Ｇとする。圧力Ｐ３が６．７匂／ ｃｒ
ｔｉ Ｇになると、圧力スイッチ１０が作動して信号が
発せられ、制御器３内の信号切換器に信号が与えられて
コントローラ１４を作動させる。このコントローラ１４
の設定値を７．２助／Ｃｒ／ｌＧとすると、圧力制御弁
１２は全閉となる。この動作を繰シ返す事によ多窒素圧
縮機の容量制御を行う。When the set value of the controller 13 is IKg/cniG, the opening degree of the pressure control valve 12 is controlled to set the pressure P2 to IkCI/C4G. Pressure P3 is 6.7 odor/cr
When ti G is reached, the pressure switch 10 is actuated and a signal is issued, and a signal is given to the signal switch in the controller 3 to actuate the controller 14. This controller 14
When the set value of is set to 7.2 Cr/lG, the pressure control valve 12 is fully closed. By repeating this operation, the capacity of the multi-nitrogen compressor is controlled.
第１２図はさらに別の実施例である。圧力Ｐ３が例えば
７．２Ｋｇ／ｉＧとなると、圧力スイッチ１０が作動し
て信号を電磁弁１４に送９、この′電磁弁１４は圧力制
御弁１２をある一定の開度にする。圧力制御弁１２の容
量またはその開度を適当に選ぶことによシ、圧力Ｐ２を
例えばＩ Ｑ ／ ｃｒｉｌ Ｇにすることが可能でお
る。また、圧力Ｐ３が例えば６−７ Ｋｆ／ ｃａ（Ｊ
になると圧力スイッチ１ｏが作動し、電磁弁１凄を介し
て圧力制御弁１２を全閉とし、供給源への圧送を開始す
る。以下同様の作動を繰シ返す。FIG. 12 shows yet another embodiment. When the pressure P3 reaches, for example, 7.2 kg/iG, the pressure switch 10 is activated and sends a signal to the solenoid valve 14, which causes the pressure control valve 12 to open to a certain degree. By appropriately selecting the capacity of the pressure control valve 12 or its opening degree, it is possible to set the pressure P2 to, for example, IQ/cril G. Moreover, the pressure P3 is, for example, 6-7 Kf/ca (J
When this happens, the pressure switch 1o is activated, the pressure control valve 12 is fully closed via the solenoid valve 1, and pressure feeding to the supply source is started. The same operation is repeated thereafter.
第１３図は窒素圧縮機が容量３７５０ｍ″／ｈ１圧カフ
Ｋｇ／ａｔｌの場合に本発明装置と従来装置の動力を
比戟したもので必る。圧送流量が５０％の場合には３５
０−２３０＝１２０ｋＷ（７）省エネルギーとなる。例
えば１年間５ｏｏｏ時間使用した場合、１５円／ｋＷｆ
（とすれば、１４４０万円の電力料金の節約となる。Figure 13 shows a comparison of the power of the device of the present invention and the conventional device when the nitrogen compressor has a capacity of 3750m''/h1 pressure cuff Kg/atl.When the pumping flow rate is 50%,
0-230=120kW (7) Energy saving. For example, if you use it for 5ooo hours in one year, it will be 15 yen/kWf.
(This would result in a savings of 14.4 million yen in electricity charges.
本発明装置は以上説明したように、吐出配・Ｕの逆止弁
下流側の圧力を検出してその圧力が設定値以上となった
ときに逆止弁上流側の圧力を大気圧よシ若干高い圧力に
調整するように制御弁の開度全制御するようにしたから
、大気中の空気が配管内に侵入することが防止でき、よ
って窒素ガスの純度低下を完全に防止できる。しかも、
圧送流量の変化に応じて逆止弁上流側の吐出配管内圧力
を低下させる゛ようにしているから、圧縮機の軸動力を
低下させることができ、よって省エネルギーを計ること
ができる効果がある。As explained above, the device of the present invention detects the pressure on the downstream side of the check valve of the discharge pipe U, and when the pressure exceeds a set value, changes the pressure on the upstream side of the check valve to atmospheric pressure. Since the opening of the control valve is fully controlled to adjust the pressure to a high level, it is possible to prevent air from the atmosphere from entering the piping, thereby completely preventing a decrease in the purity of nitrogen gas. Moreover,
Since the pressure inside the discharge pipe on the upstream side of the check valve is reduced in response to changes in the pumping flow rate, the shaft power of the compressor can be reduced, which has the effect of saving energy.
第１図〜第４図は空気圧縮機の容量制御装置を示すもの
で、第１図はその系統図、第２図は逆止弁下流側圧力Ｐ
３の変化を示す線図、ｓ３図は逆上弁上流側圧力Ｐ２の
変化を示す線図、第４図は圧送流量と軸動力の関係を示
す線図、第５図〜第６図は従来の窒素圧ａ機の容量制御
装置を示すもので、第５図はその系統図、第６図は圧縮
機の圧送流量とその軸動力との関係を示す線図、第７図
〜第１０図は本発明の窒素圧縮機の容量制御装置の一実
施ｆｌＪ１ｒ：示すもので、第７図はその系統図、第８
図は圧力Ｐ３の変化を示す線図、第９図は圧力Ｐ２の変
化を示す線図、第１０図は圧縮機の圧送流量とその軸動
力との関係を示す線図、第１１図および第１２図はそれ
ぞれ本発明装置の他の実施例を示す系統図、第１３図は
本発明装置の効果全具体的な例で示した線図である。
１・・・窒素圧縮機、５・・・逆止弁、６・・・吐出配
管、７・・・吸込配ｇ１１２・・・圧力制御弁、１１・
・・制御器。
第 １ の
第３ 図
第 ４ 口
五送歳量
第 ５ 図
υ
第 ６ 口
第 ７ 目
第 ３ 図
第 ９ 口
第 １０ 図
μ
斤送汽量
￥］１１ 図Figures 1 to 4 show the capacity control device of an air compressor. Figure 1 is its system diagram, and Figure 2 is the pressure P on the downstream side of the check valve.
Figure 3 is a diagram showing changes in pressure P2 on the upstream side of the reverse valve, Figure 4 is a diagram showing the relationship between pumping flow rate and shaft power, Figures 5 and 6 are conventional diagrams. Fig. 5 is a system diagram thereof, Fig. 6 is a diagram showing the relationship between the pumping flow rate of the compressor and its shaft power, and Figs. 7 to 10. shows one implementation of the nitrogen compressor capacity control device of the present invention, FIG. 7 is its system diagram, and FIG.
9 is a diagram showing changes in pressure P3, FIG. 9 is a diagram showing changes in pressure P2, FIG. 10 is a diagram showing the relationship between the compressor's pumping flow rate and its shaft power, and FIGS. FIG. 12 is a system diagram showing other embodiments of the device of the present invention, and FIG. 13 is a line diagram showing all the effects of the device of the present invention in concrete examples. DESCRIPTION OF SYMBOLS 1... Nitrogen compressor, 5... Check valve, 6... Discharge piping, 7... Suction distribution g112... Pressure control valve, 11...
...Controller. Figure 1, Figure 3, Figure 4, Figure 4, Figure 5, Figure 5, Figure 6, Figure 7, Figure 9, Figure 10, μ, Volume of loaf steaming, ¥] Figure 11.
Claims (1)
止弁を備える吐出配管と、該吐出配管の逆上弁上流側と
圧縮機の吸込配管を連通するノくイパス配゛ａと、該バ
イパス配管の途中に設けた制御弁とを備えるものにおい
て、前記制御弁は前記吐出配管内の圧力を任意の値に調
整できる圧力制御弁によ多構成し、かつ吐出配管の逆止
弁下流側の圧力を検出してその圧力が設定値以上となっ
たときに前記逆止弁上流側の吐出配管内圧力を大気圧よ
り若干高い圧力に調整するように前記制御弁の開度を制
御する制御器を設けたことを特徴とする窒素圧ａ機の容
量制御装置。A nitrogen compressor, a discharge piping provided with a check valve that communicates with the discharge side of the nitrogen compressor, and a check pass arrangement a that communicates the upstream side of the reverse valve of the discharge piping with the suction piping of the compressor. , and a control valve provided in the middle of the bypass piping, wherein the control valve is configured with a pressure control valve capable of adjusting the pressure in the discharge piping to an arbitrary value, and a check valve of the discharge piping is provided. The opening degree of the control valve is controlled so that when the pressure on the downstream side is detected and the pressure exceeds a set value, the pressure inside the discharge pipe on the upstream side of the check valve is adjusted to a pressure slightly higher than atmospheric pressure. 1. A capacity control device for a nitrogen pressure machine, characterized in that a controller is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22608382A JPS59119089A (en) | 1982-12-24 | 1982-12-24 | Capacity controlling apparatus for nitrogen compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22608382A JPS59119089A (en) | 1982-12-24 | 1982-12-24 | Capacity controlling apparatus for nitrogen compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59119089A true JPS59119089A (en) | 1984-07-10 |
Family
ID=16839551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22608382A Pending JPS59119089A (en) | 1982-12-24 | 1982-12-24 | Capacity controlling apparatus for nitrogen compressor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59119089A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03160181A (en) * | 1989-11-15 | 1991-07-10 | Sumitomo Heavy Ind Ltd | Power reducing method for mechanically-driven lysholm type supercharger |
-
1982
- 1982-12-24 JP JP22608382A patent/JPS59119089A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03160181A (en) * | 1989-11-15 | 1991-07-10 | Sumitomo Heavy Ind Ltd | Power reducing method for mechanically-driven lysholm type supercharger |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1134422A3 (en) | Turbo compressor surge control method | |
| TW200512373A (en) | Compressor control device | |
| WO2022111577A1 (en) | Bypass auxiliary system for closed brayton cycle heat engine system, heat engine device, and regulation method therefor | |
| JPS59119089A (en) | Capacity controlling apparatus for nitrogen compressor | |
| JPS60249694A (en) | Starting unloader device for compressor | |
| JP2018165583A (en) | Method and device for avoiding surge of supercharger attached to incinerator | |
| JPS61197793A (en) | Cooling method in multi-stage root type vacuum pump | |
| EP1600630A2 (en) | Multistage gas compressor and its control method | |
| JPS59133365A (en) | Vacuum device | |
| CN110645475A (en) | Blast furnace oxygen conveying system and working method | |
| CN110454371B (en) | Method for dynamically matching lower pressure limiting during joint control of air compression station | |
| JPH10141013A (en) | Extra steam collecting device | |
| TWI240947B (en) | Pumping system of load lock chamber and operating method thereof | |
| JPS611895A (en) | Method of preventing condensation in multiple stage compressor | |
| JPS62103979A (en) | Control method for turbo-compressor system | |
| CN114992176A (en) | Gas path control system and method for adjusting pressure plate cylinder | |
| JPH0916266A (en) | Flow rate controller | |
| JP2004068685A (en) | Control method and control system for primary and secondary valves | |
| JPS63198794A (en) | Controller for following-up load fluctuation in pneumatic machinery | |
| JPH0587325A (en) | Control of steam pressure for soot blower | |
| JP2003097800A (en) | Method for supplying steam by steam accumulator | |
| JPH0749039A (en) | Gas turbine | |
| JPH1162886A (en) | Gas supplying system to plant and method for controlling it | |
| JPH0261640B2 (en) | ||
| JPH04269331A (en) | Control method for fuel gas flow |