JP3694464B2

JP3694464B2 - Oil-cooled compressor

Info

Publication number: JP3694464B2
Application number: JP2001082915A
Authority: JP
Inventors: 省二吉村; 正樹松隈; 中村　　元
Original assignee: Kobe Steel Ltd
Current assignee: Kobe Steel Ltd
Priority date: 2001-03-22
Filing date: 2001-03-22
Publication date: 2005-09-14
Anticipated expiration: 2021-03-22
Also published as: JP2002276552A

Description

【０００１】
【発明の属する技術分野】
本発明は、ガス圧縮するロータ室内に油注入する油冷式圧縮機に関するものである。
【０００２】
【従来の技術】
従来、油冷式圧縮機は周知であり（例：特開昭61-294188号公報）、この油冷式圧縮機においては、ガス圧縮するロータ室内に注入する油の一部或いは全量を油クーラにより冷却して圧縮ガスの吐出温度が異常上昇するのを防止する一方で、その吸込みガスに含まれている水分が、圧縮ガスの吐出時に水ドレンとして析出するのを回避するために、圧縮ガスの吐出温度が低下し過ぎないようにする対策が採られている。具体的には、圧縮ガスの吐出温度、或いはこの吐出温度にほぼ等しい上記油クーラの一次側の油温度を検出して、この検出油温が設定温度よりも低い場合には、上記油クーラを経由させる冷却油の量に比してこの油クーラを通さず、バイパスさせるバイパス油の量を多くして上記注入油の温度を上昇させ、逆に上記検出油温が設定温度よりも高い場合には、上記冷却油の量に比して上記バイパス油の量を少なくして上記注入油の温度を低下させている。
【０００３】
この油冷式圧縮機への注油量ｑと注油温度Ｔ_Ｏとの間の関係は次式により表される。
【数１】

（１）式は次式のように書き換えることができる。
【数２】

【０００４】
（２）式より、圧縮機動力Ｗ、ガス重量流量Ｇおよび注油量ｑが一定の場合には、注油温度Ｔ_Ｏが上昇するとＴ_Ｄが上昇する。また、注油量ｑを増大させてゆくにしたがって、ガス吐出温度Ｔ_Ｄは注油温度Ｔ_Ｏに等しくなってゆき、理論上は、注油量ｑが無限大でガス吐出温度Ｔ_Ｄ＝注油温度Ｔ_Ｏとなる。これに対して、注油量ｑ＝０のときは、Ｔ_Ｄ＝（Ｗ＋Ｃ_ＡＧＴ_Ｓ）／Ｃ_ＡＧとなり、通常はガス吐出温度Ｔ_Ｄの方が注油温度Ｔ_Ｏよりも高い故、注油温度Ｔ_Ｏを一定として注油量ｑを減少させるとガス吐出温度Ｔ_Ｄが上昇する。
そして、これまではガス吐出温度Ｔ_Ｄの調節は、注油量ｑを一定に保ったままで、注油温度Ｔ_Ｏを変えることにより行われていた。
【０００５】
【発明が解決しようとする課題】
油冷式圧縮機のロータ室内に注入する油は、上述したようにガス吐出温度Ｔ_Ｄに関係し、これを調節するための働きをする他に、ロータの周囲のシールおよび潤滑のための役目もしており、そのための最低限の量を必要とする。このため、従来の油冷式圧縮機では、上述したように、注油量ｑを一定に保ち、注油温度Ｔ_Ｏのみを変えることによりガス吐出温度Ｔ_Ｄの調節を行っていた。
ところが、油が吸込ガスと接触すると、ガスが油により加熱されて膨張し、その膨張量だけ吸込ガスの重量流量が減少することになり、油冷式圧縮機の性能が低下するという問題がある。
本発明は、斯る従来の問題をなくすことを課題としてなされたもので、油による吸込ガスの加熱を抑制し、この加熱による性能低下を最小限に止めるようにした油冷式圧縮機を提供しようとするものである。
【０００６】
【課題を解決するための手段】
上記課題を解決するために、第一発明は、圧縮機本体と、その吐出流路に介在する油分離回収器と、この油分離回収器の下部の油溜り部から延び、上記圧縮機本体内の少なくともロータ室に通じる油流路とを備えた油冷式圧縮機において、油温を調節する油温調節部と上記油流路における必要最少限度の油流量を超える油流量のみを調節する流量調節部とを上記油流路に設け、上記吐出流路或いは上記油溜り部或いはこの油溜り部と油温調節部との間の油温が予め定めた設定温度を超える場合は、上記油温調節部により上記油温を降下させ、この上記油温調節部が最も強く油冷却する状態に至った後は、上記油温を下げるために上記流量調節部にて油流量を増大させ、上記油温が上記設定温度以下の場合は、流量調節部にて油流量を減少させ、この油流量が上記必要最少限度の値に達した後は、上記油温調節部により上記油温を上昇させるように形成した。
【０００７】
また、第二発明は、圧縮機本体と、その吐出流路に介在する油分離回収器と、この油分離回収器の下部の油溜り部から延び、上記圧縮機本体内の少なくともロータ室に通じる油流路とを備えた油冷式圧縮機において、油温を調節する油温調節部と上記油流路における必要最少限度の油流量を超える油流量のみを調節する流量調節部とを上記油流路に設け、上記上記吐出流路或いは上記油溜り部或いはこの油溜り部と油温調節部との間の油温が予め定めた第一設定温度よりも高い場合は、上記流量調節部にて油流量を増大させ、上記油温が上記第一設定温度以下の場合は、上記流量調節部にて油流量を減少させる一方、上記油温が上記第一設定温度よりも低い第二設定温度よりも高い場合は、上記油温調節部により上記油温を降下させ、上記油温が上記第二設定温度以下の場合は、上記油温調節部により上記油温を上昇させるように形成した。
【０００８】
【発明の実施の形態】
次に、本発明の実施形態を図面にしたがって説明する。
図１は、第一本発明に係る油冷式圧縮機１、例えば油冷式スクリュ圧縮機を示し、この油冷式圧縮機１の圧縮機本体１１の一方には吸込流路１２が、他方には吐出流路１３が延びている。吐出流路１３には、油分離回収器１４が介在し、その下部の油溜り部１５からは圧縮機本体１１内の少なくともロータ室に通じる油流路１６が延びている。
【０００９】
吐出流路１３には、温度検出可能に温度検出器２１が設けてあり、油流路１６には、温度検出器２１から検出温度を示す温度信号を受けるコントローラ２２により制御される流量調節部２３と油温調節部２４とが設けてある。さらに詳説すると、この流量調節部２３は、流量調節用の弁Ａを介在させた流路部分とこの弁Ａの一次側にて上記流路部分から分岐し、オリフィス２５を経て、弁Ａの二次側で上記流路部分に合流する必要最少限度の油流量を確保するためのバイパス流路２６とからなっており、後述するように弁Ａの開度がコントローラ２２からの制御信号に基づき調節される。
【００１０】
また、油温調節部２４は、流路切換え用の三方切換弁である弁Ｂおよび油クーラ２７が介設された流路部分と弁Ｂにてこの流路部分から分岐し、油クーラ２７を経由することなく直接油クーラ２７の二次側にてこの流路部分に合流する油冷却を避けるためのバイパス流路２８とからなっている。この弁Ｂは弁Ａに連通するポートａと、油クーラ２７に連通するポートｂと、バイパス流路２８に接続するポートｃとを有し、後述するように、ポートａ，ｂを連通させる内部流路の開度とポートａ，ｃを連通させる内部流路の開度、即ちバイパス側開度がコントローラ２２からの制御信号に基づき調節される。
【００１１】
そして、上記温度検出器２１により油を伴ったガスの温度が検出され、この検出された油温が、予め定めた設定温度を超える場合は、油温調節部２８の弁Ｂが、上記バイパス側開度に比してポートａ，ｂを連通させる内部流路の開度が増大するようにコントローラ２２により制御され、上記油温が降下させられる。この油温調節部２８が最も強く油冷却する状態に至った後、即ち上記バイパス側開度がゼロで、ポートａ，ｂを連通させる内部流路の開度が最大値に達した後は、流量調節部２３の弁Ａが、その開度を大きくして上記油流量を増大させるようにコントローラ２２により制御され、上記油温が降下させられる。
【００１２】
一方、上記油温が上記設定温度以下の場合は、流量調節部２３の弁Ａが、その開度を小さくして上記油流量を減少させるようにコントローラ２２により制御され、上記油温が上昇させられる。そして、弁Ａの開度がゼロに達した後は、油温調節部２８により上記油温させられる。即ち、弁Ｂがコントローラ２２により制御され、上記バイパス側開度が大きくさせられる。
【００１３】
このように、この油冷式圧縮機１では、圧縮機本体１１への必要最少限度の油流量を確保した状態下で、吐出流路１３の吐出温度を示す上記油温を調節するに当って、上記油温が高過ぎる場合は、まず油温調節部２４で油温調節がなされ、ここでの油温降下のための調節が限界に達した後は、流量調節部２４で油流量を増大させるように調節がなされる。
【００１４】
図２は、第二本発明に係る油冷式圧縮機２、例えば油冷式スクリュ圧縮機を示し、図１に示す油冷式圧縮機１と互いに共通する部分については、同一番号を付して説明を省略する。
この油冷式圧縮機２では、流量調節部２３の弁Ａは温度検出器２１から検出温度を示す温度信号を受ける第一コントローラ２２Ａにより制御され、油温調節部２３の弁Ｂは温度検出器２１から検出温度を示す温度信号を受ける第二コントローラ２２Ｂにより制御される。
【００１５】
具体的には、第一コントローラ２２Ａには予め第一設定温度が定められており、上記油温がこの第一設定温度よりも高い場合は、弁Ａが、その開度を大きくして上記油を増大させるようにコントローラ２２Ａにより制御され、上記油温がこの第一設定温度以下の場合は、弁Ａが、その開度を小さく上記油を減少させるようにコントローラ２２Ａにより制御される。一方、第二コントローラ２２Ｂには予め第二設定温度が定められており、上記油温がこの第二設定温度よりも高い場合は、弁Ｂが、上記バイパス側開度を小さくして油冷却される油量の比率を増大させるようにコントローラ２２Ｂにより制御され、上記油温がこの第二設定温度以下の場合は、弁Ｂが、上記バイパイ側開度を大きくして油冷却される油量の比率を減少させるようにコントローラ２２Ｂにより制御される。
このように、この油冷式圧縮機２では、弁Ａはコントローラ２２Ａにより、弁Ｂはコントローラ２２Ｂにより、それぞれ別個独立に制御され、上記油温の調節がなされる。
【００１６】
なお、本発明は、上述した構成に限定するものではなく、弁Ａおよび弁Ｂとして、内部に収容された流体、即ち内部流体の温度変化に伴う膨張、収縮の作用により弁体が作動して、内部流路の開度調節が可能な市販のタイプの弁を採用して、上記温度検出器２１、コントローラ２２，２２Ａおよび２２Ｂを省いてもよい。この場合、圧縮機本体１１から吐出されて油分離回収器１４内の油溜り部１５を経て、油クーラ２７に達するまでのいずれかの部分における油と熱交換可能に上記内部流体が位置するようにし、上記油温とともに上記内部流体が温度変化するようにする。したがって、本願発明は、また、上記油温を必ずしも、吐出流路１３における油の温度に限定するものではなく、吐出流路１３から油分離回収器１４内の油溜り部１５を経て、油クーラ２７に達するまでのいずれかの部分における油の温度を含むものである。
【００１７】
【発明の効果】
以上の説明より明らかなように、第一本発明によれば、圧縮機本体と、その吐出流路に介在する油分離回収器と、この油分離回収器の下部の油溜り部から延び、上記圧縮機本体内の少なくともロータ室に通じる油流路とを備えた油冷式圧縮機において、油温を調節する油温調節部と上記油流路における必要最少限度の油流量を超える油流量のみを調節する流量調節部とを上記油流路に設け、上記吐出流路或いは上記油溜り部或いはこの油溜り部と油温調節部との間の油温が予め定めた設定温度を超える場合は、上記油温調節部により上記油温を降下させ、この上記油温調節部が最も強く油冷却する状態に至った後は、上記油温を下げるために上記流量調節部にて油流量を増大させ、上記油温が上記設定温度以下の場合は、流量調節部にて油流量を減少させ、この油流量が上記必要最少限度の値に達した後は、上記油温調節部により上記油温を上昇させるように形成してある。
【００１８】
このため、如何なる状況下でも、油が途絶えることに起因する機械的な異常の発生を防ぎ、かつ圧縮機本体に供給する油の温度を低くしつつ、油流量を最小限にとどめるようにすることが可能になり、油による吸込みガスの加熱およびこれに伴う吸込みガスの重量流量の減少を防ぎ、油冷式圧縮機の性能の向上が可能になるという効果を奏する。
【００１９】
また、第二本発明によれば、圧縮機本体と、その吐出流路に介在する油分離回収器と、この油分離回収器の下部の油溜り部から延び、上記圧縮機本体内の少なくともロータ室に通じる油流路とを備えた油冷式圧縮機において、油温を調節する油温調節部と上記油流路における必要最少限度の油流量を超える油流量のみを調節する流量調節部とを上記油流路に設け、上記上記吐出流路或いは上記油溜り部或いはこの油溜り部と油温調節部との間の油温が予め定めた第一設定温度よりも高い場合は、上記流量調節部にて油流量を増大させ、上記油温が上記第一設定温度以下の場合は、上記流量調節部にて油流量を減少させる一方、上記油温が上記第一設定温度よりも低い第二設定温度よりも高い場合は、上記油温調節部により上記油温を降下させ、上記油温が上記第二設定温度以下の場合は、上記油温調節部により上記油温を上昇させるように形成してある。
【００２０】
このため、第一発明による効果に加えて、より制御が簡単になるという効果を
【図面の簡単な説明】
【図１】第一発明に係る油冷式圧縮機の全体構成を示す図である。
【図２】第二発明に係る油冷式圧縮機の全体構成を示す図である。
【符号の説明】
１，２油冷式圧縮機
１１圧縮機本体
１３吐出流路
１４油分離回収器
１５油溜り部
１６油流路
２１温度検出器
２２コントローラ
２２Ａ第一コントローラ
２２Ｂ第二コントローラ
２３流量調節部
２４油温調節部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil-cooled compressor that injects oil into a rotor chamber for gas compression.
[0002]
[Prior art]
Conventionally, oil-cooled compressors are well known (eg, Japanese Patent Laid-Open No. 61-294188). In this oil-cooled compressor, part or all of the oil injected into the rotor chamber for gas compression is oil cooler. In order to prevent the discharge temperature of the compressed gas from rising abnormally by cooling by the above, while preventing the moisture contained in the suction gas from precipitating as water drain during the discharge of the compressed gas, Measures are taken to prevent the discharge temperature of the liquid from excessively decreasing. Specifically, the discharge temperature of the compressed gas or the oil temperature on the primary side of the oil cooler that is substantially equal to the discharge temperature is detected, and if the detected oil temperature is lower than the set temperature, the oil cooler is When this oil cooler is not passed through compared to the amount of cooling oil to be passed through, the amount of bypass oil to be bypassed is increased to raise the temperature of the injected oil, and conversely when the detected oil temperature is higher than the set temperature. Reduces the temperature of the injection oil by reducing the amount of the bypass oil compared to the amount of the cooling oil.
[0003]
The relationship between the oil quantity q to the oil-cooled compressor and the oil temperature T _O is expressed by the following equation.
[Expression 1]

Equation (1) can be rewritten as:
[Expression 2]

[0004]
Equation (2), when the compressor power W, the gas weight flow rate G and lubrication amount q is constant, T _D is increased when the oil feed temperature T _O is increased. Further, as the lubrication amount q is increased, the gas discharge temperature T _D becomes equal to the lubrication temperature T _O. Theoretically, the lubrication amount q is infinite and the gas discharge temperature T _D = the lubrication temperature T _O. It becomes. On the other hand, when the lubrication amount q = 0, T _D = (W + C _A GT _S ) / C _A G, and since the gas discharge temperature T _D is usually higher than the lubrication temperature T _O , the lubrication temperature When the T _O decreases the lubrication amount q as a constant gas discharge temperature T _D is increased.
The regulation of the gas discharge temperature T _D is far, while maintaining the lubrication amount q constant, it has been performed by changing the lubrication temperature T _O.
[0005]
[Problems to be solved by the invention]
Oil to be injected into the rotor chamber of the oil-cooled compressor is related to the gas discharge temperature T _D, as described above, in addition to the function for adjusting this role for the sealing and lubrication of the circumference of the rotor And we need a minimum amount for that. Therefore, in the conventional oil-cooled compressor, as described above, keeping the oil feed quantity q constant, it has been performed an adjustment of the gas discharge temperature T _D by changing only the lubrication temperature T _O.
However, when the oil comes into contact with the suction gas, the gas is heated by the oil and expands, and the weight flow rate of the suction gas decreases by the amount of expansion, and the performance of the oil-cooled compressor deteriorates. .
The present invention has been made to eliminate such conventional problems, and provides an oil-cooled compressor that suppresses the heating of the suction gas by oil and minimizes the performance degradation due to this heating. It is something to try.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the first invention extends from a compressor main body, an oil separation and recovery device interposed in the discharge flow path, and an oil reservoir portion below the oil separation and recovery device. In an oil-cooled compressor equipped with at least an oil flow path leading to the rotor chamber, an oil temperature adjusting section for adjusting the oil temperature and a flow rate for adjusting only the oil flow rate exceeding the minimum required oil flow rate in the oil flow path When the oil temperature between the discharge flow path, the oil reservoir, or the oil reservoir and the oil temperature adjuster exceeds a preset temperature, the oil temperature is adjusted. After the oil temperature is lowered by the adjusting unit and the oil temperature adjusting unit reaches the state where the oil is most strongly cooled, the oil flow rate is increased by the flow rate adjusting unit to lower the oil temperature, If the temperature is lower than the set temperature, decrease the oil flow rate with the flow control section. After the oil flow rate reaches the value of the required minimum limit, it was formed to raise the oil temperature by the oil temperature adjusting unit.
[0007]
Further, the second invention extends from the compressor main body, the oil separation / recovery device interposed in the discharge flow path, and the oil reservoir portion below the oil separation / recovery device, and communicates with at least the rotor chamber in the compressor main body. In an oil-cooled compressor including an oil flow path, an oil temperature control unit that adjusts the oil temperature and a flow rate control unit that adjusts only the oil flow rate exceeding the minimum required oil flow rate in the oil flow path are If the oil temperature between the discharge flow path, the oil reservoir, or the oil reservoir and the oil temperature controller is higher than a predetermined first set temperature, the flow controller When the oil temperature is equal to or lower than the first set temperature, the oil flow rate is decreased by the flow rate adjustment unit, while the oil temperature is lower than the first set temperature. The oil temperature is lowered by the oil temperature adjusting unit, If it is less than the second set temperature, and formed to raise the oil temperature by the oil temperature adjusting unit.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an oil-cooled compressor 1 according to the first aspect of the present invention, for example, an oil-cooled screw compressor, and a suction passage 12 is provided on one side of a compressor body 11 of the oil-cooled compressor 1 and the other. The discharge channel 13 extends. An oil separation / recovery unit 14 is interposed in the discharge flow path 13, and an oil flow path 16 communicating with at least the rotor chamber in the compressor body 11 extends from the oil reservoir 15 at the lower part.
[0009]
The discharge flow path 13 is provided with a temperature detector 21 so that the temperature can be detected, and the oil flow path 16 has a flow rate adjusting unit 23 controlled by a controller 22 that receives a temperature signal indicating the detected temperature from the temperature detector 21. And an oil temperature adjusting unit 24 are provided. More specifically, the flow rate adjusting unit 23 branches from the flow path portion where the flow rate adjusting valve A is interposed and the flow path portion on the primary side of the valve A, passes through the orifice 25, and the two of the valve A. It consists of a bypass flow passage 26 for ensuring the minimum necessary oil flow rate to join the flow passage portion on the next side, and the opening degree of the valve A is adjusted based on a control signal from the controller 22 as will be described later. Is done.
[0010]
The oil temperature adjusting unit 24 branches from the flow path portion and the flow path portion where the valve B and the oil cooler 27, which are three-way switching valves for switching the flow path, and the valve B are provided. It consists of a bypass flow path 28 for avoiding oil cooling that joins this flow path portion directly on the secondary side of the oil cooler 27 without going through. This valve B has a port a communicating with the valve A, a port b communicating with the oil cooler 27, and a port c connected to the bypass flow path 28. As will be described later, the valve B communicates with the ports a and b. The opening of the flow path and the opening of the internal flow path that communicates the ports a and c, that is, the opening on the bypass side is adjusted based on the control signal from the controller 22.
[0011]
When the temperature of the gas accompanied with oil is detected by the temperature detector 21 and the detected oil temperature exceeds a preset temperature, the valve B of the oil temperature adjusting unit 28 is connected to the bypass side. The oil temperature is lowered by being controlled by the controller 22 so that the opening degree of the internal flow path that communicates the ports a and b with respect to the opening degree is increased. After the oil temperature adjusting unit 28 reaches the state where the oil is most strongly cooled, that is, after the opening degree of the bypass side is zero and the opening degree of the internal flow path connecting the ports a and b reaches the maximum value, The valve A of the flow rate adjusting unit 23 is controlled by the controller 22 so as to increase the oil flow rate by increasing the opening degree, and the oil temperature is lowered.
[0012]
On the other hand, when the oil temperature is equal to or lower than the set temperature, the valve A of the flow rate adjusting unit 23 is controlled by the controller 22 so as to decrease the oil flow rate by reducing the opening degree, thereby increasing the oil temperature. It is done. Then, after the opening degree of the valve A reaches zero, the oil temperature is adjusted by the oil temperature adjusting unit 28. That is, the valve B is controlled by the controller 22 and the bypass opening is increased.
[0013]
As described above, in the oil-cooled compressor 1, the oil temperature indicating the discharge temperature of the discharge flow path 13 is adjusted in a state where the minimum required oil flow rate to the compressor body 11 is secured. When the oil temperature is too high, the oil temperature adjustment unit 24 first adjusts the oil temperature, and after reaching the limit for adjusting the oil temperature, the flow rate adjustment unit 24 increases the oil flow rate. Adjustments are made to
[0014]
FIG. 2 shows an oil-cooled compressor 2 according to the second aspect of the present invention, for example, an oil-cooled screw compressor, and parts common to the oil-cooled compressor 1 shown in FIG. The description is omitted.
In this oil-cooled compressor 2, the valve A of the flow rate adjusting unit 23 is controlled by a first controller 22A that receives a temperature signal indicating the detected temperature from the temperature detector 21, and the valve B of the oil temperature adjusting unit 23 is a temperature detector. The second controller 22B receives a temperature signal indicating the detected temperature from the control unit 21B.
[0015]
Specifically, a first set temperature is set in advance in the first controller 22A, and when the oil temperature is higher than the first set temperature, the valve A increases the opening degree and the oil When the oil temperature is equal to or lower than the first set temperature, the valve A is controlled by the controller 22A so that the degree of opening is reduced and the oil is decreased. On the other hand, a second set temperature is set in advance in the second controller 22B, and when the oil temperature is higher than the second set temperature, the valve B is oil-cooled by reducing the bypass opening. When the oil temperature is equal to or lower than the second set temperature, the valve B is configured to increase the amount of oil to be cooled by increasing the degree of opening of the bypass pipe side. It is controlled by the controller 22B so as to decrease the ratio.
As described above, in the oil-cooled compressor 2, the valve A is controlled by the controller 22A and the valve B is separately controlled by the controller 22B, and the oil temperature is adjusted.
[0016]
The present invention is not limited to the above-described configuration. As the valve A and the valve B, the valve body is operated by the action of expansion and contraction accompanying the temperature change of the fluid contained therein, that is, the internal fluid. Further, a commercially available type valve capable of adjusting the opening degree of the internal flow path may be adopted, and the temperature detector 21 and the

controllers

22, 22A and 22B may be omitted. In this case, the internal fluid is positioned so as to be able to exchange heat with oil in any part from the compressor body 11 to the oil cooler 27 through the oil reservoir 15 in the oil separator / collector 14. The internal fluid changes in temperature with the oil temperature. Accordingly, the present invention does not necessarily limit the oil temperature to the temperature of the oil in the discharge flow path 13, and passes through the oil reservoir 15 in the oil separator / collector 14 from the discharge flow path 13 to the oil cooler. The temperature of oil in any part up to 27 is included.
[0017]
【The invention's effect】
As is clear from the above description, according to the first aspect of the present invention, the compressor main body, the oil separation / recovery device interposed in the discharge flow path, and the oil sump portion below the oil separation / recovery device, In an oil-cooled compressor equipped with an oil flow path leading to at least the rotor chamber in the compressor body, only an oil flow rate that exceeds the minimum required oil flow rate in the oil flow path and an oil temperature adjustment section that adjusts the oil temperature. When the oil flow path is provided in the oil flow path, and the oil temperature between the discharge flow path or the oil reservoir or the oil reservoir and the oil temperature adjustment section exceeds a preset temperature, After the oil temperature is lowered by the oil temperature adjusting unit and the oil temperature adjusting unit reaches the state where the oil is most strongly cooled, the oil flow rate is increased by the flow rate adjusting unit to lower the oil temperature. If the oil temperature is lower than the set temperature, Reduces, after the oil flow rate reaches the value of the required minimum limit, is formed so as to raise the oil temperature by the oil temperature adjusting unit.
[0018]
For this reason, under any circumstances, to prevent the occurrence of mechanical abnormalities due to oil interruption, and to keep the oil flow rate to a minimum while lowering the temperature of the oil supplied to the compressor body. Thus, it is possible to prevent the heating of the suction gas by the oil and the accompanying decrease in the weight flow rate of the suction gas, thereby improving the performance of the oil-cooled compressor.
[0019]
According to the second aspect of the present invention, at least the rotor in the compressor body extends from the compressor body, the oil separation / recovery unit interposed in the discharge flow path, and the oil reservoir portion below the oil separation / recovery unit. In an oil-cooled compressor having an oil flow path leading to a chamber, an oil temperature adjustment section that adjusts the oil temperature, and a flow rate adjustment section that adjusts only the oil flow rate that exceeds the minimum required oil flow rate in the oil flow path, Is provided in the oil flow path, and when the oil temperature between the discharge flow path or the oil reservoir or between the oil reservoir and the oil temperature adjusting unit is higher than a predetermined first set temperature, the flow rate When the oil flow rate is increased by the adjustment unit and the oil temperature is equal to or lower than the first set temperature, the oil flow rate is decreased by the flow rate adjustment unit, while the oil temperature is lower than the first set temperature. If the temperature is higher than the two preset temperatures, the oil temperature is decreased by the oil temperature control unit. If the oil temperature is below the second preset temperature, it is formed so as to raise the oil temperature by the oil temperature adjusting unit.
[0020]
For this reason, in addition to the effect of the first invention, the effect that the control becomes simpler is described.
FIG. 1 is a diagram showing an overall configuration of an oil-cooled compressor according to a first invention.
FIG. 2 is a diagram showing an overall configuration of an oil-cooled compressor according to a second invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 2 Oil-cooled compressor 11 Compressor main body 13 Discharge flow path 14 Oil separation collection | recovery device 15 Oil reservoir 16 Oil flow path 21 Temperature detector 22 Controller 22A 1st controller 22B 2nd controller 23 Flow control part 24 Oil temperature Adjustment unit

Claims

A compressor main body, an oil separation / recovery device interposed in the discharge flow passage, and an oil flow passage extending from an oil reservoir at a lower portion of the oil separation / recovery device and communicating with at least the rotor chamber in the compressor main body. In the oil-cooled compressor, an oil temperature adjusting unit for adjusting the oil temperature and a flow rate adjusting unit for adjusting only the oil flow rate exceeding the minimum required oil flow rate in the oil flow channel are provided in the oil flow channel, and the discharge When the oil temperature between the flow path or the oil reservoir or between the oil reservoir and the oil temperature adjusting unit exceeds a preset temperature, the oil temperature adjusting unit lowers the oil temperature, After reaching the state where the temperature control unit cools the oil most strongly, the flow rate control unit increases the oil flow rate to lower the oil temperature, and if the oil temperature is equal to or lower than the set temperature, the flow rate control unit Decrease the oil flow rate at, and this oil flow rate will reach the minimum required value. After the oil-cooled compressor, characterized in that the formation to raise the oil temperature by the oil temperature adjusting unit.

A compressor main body, an oil separation / recovery device interposed in the discharge flow passage, and an oil flow passage extending from an oil reservoir at a lower portion of the oil separation / recovery device and communicating with at least the rotor chamber in the compressor main body. In the oil-cooled compressor, an oil temperature adjusting unit for adjusting the oil temperature and a flow rate adjusting unit for adjusting only the oil flow rate exceeding the minimum required oil flow rate in the oil flow channel are provided in the oil flow channel, and the discharge When the oil temperature between the flow path or the oil reservoir or between the oil reservoir and the oil temperature adjusting unit is higher than a predetermined first set temperature, the oil flow rate is increased in the flow rate adjusting unit, When the oil temperature is equal to or lower than the first set temperature, the oil flow rate is decreased by the flow rate adjusting unit, while when the oil temperature is higher than the second set temperature lower than the first set temperature, the oil The oil temperature is lowered by a temperature control unit, and the oil temperature is not less than the second set temperature. For the oil-cooled compressor, characterized in that the formation to raise the oil temperature by the oil temperature adjusting unit.