JP4559283B2 - 2-stage screw refrigerator - Google Patents

2-stage screw refrigerator Download PDF

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JP4559283B2
JP4559283B2 JP2005122563A JP2005122563A JP4559283B2 JP 4559283 B2 JP4559283 B2 JP 4559283B2 JP 2005122563 A JP2005122563 A JP 2005122563A JP 2005122563 A JP2005122563 A JP 2005122563A JP 4559283 B2 JP4559283 B2 JP 4559283B2
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昇 壷井
英次 神吉
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Kobe Steel Ltd
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Description

本発明は、２段油冷式スクリュ圧縮機を用いた２段スクリュ冷凍機に関するものである。   The present invention relates to a two-stage screw refrigerator using a two-stage oil-cooled screw compressor.

従来、２段油冷式スクリュ圧縮機を用いた２段スクリュ冷凍機は公知である（例えば、特許文献１及び２参照。）。
特開平１−２７３８９４号公報 特開２００３−１３０４７７号公報 Conventionally, a two-stage screw refrigerator using a two-stage oil-cooled screw compressor is known (see, for example, Patent Documents 1 and 2).
JP-A-1-273894 JP 2003-130477 A

特許文献１に記載の２段スクリュ冷凍機では、２段油冷式スクリュ圧縮機から圧縮冷媒ガスとともに吐出された油は油分離回収器（オイルセパレータ）でこの冷媒ガスから分離、回収された後、水冷式の油冷却器（オイルクーラ）で冷却され、オイルストレーナを経て軸受等に供給されている。   In the two-stage screw refrigerator described in Patent Document 1, oil discharged together with the compressed refrigerant gas from the two-stage oil-cooled screw compressor is separated and recovered from this refrigerant gas by an oil separator / collector (oil separator). It is cooled by a water-cooled oil cooler (oil cooler) and supplied to a bearing or the like through an oil strainer.

特許文献２に記載の２段スクリュ冷凍機では、油冷却器における冷却媒体を供給するために、冷媒循環流路から分岐した液冷媒用分岐流路が設けられ、２段油冷式スクリュ圧縮機から圧縮冷媒ガスとともに吐出された油は油分離器でこの冷媒ガスから分離された後、上記油冷却器で上記液冷媒用分岐流路の液冷媒により冷却され、２段油冷式スクリュ圧縮機の各軸受に供給されている。   In the two-stage screw refrigerator described in Patent Document 2, a liquid refrigerant branch passage branched from the refrigerant circulation passage is provided to supply a cooling medium in the oil cooler, and a two-stage oil-cooled screw compressor is provided. The oil discharged together with the compressed refrigerant gas from the refrigerant is separated from the refrigerant gas by an oil separator, and then cooled by the liquid refrigerant in the liquid refrigerant branch flow path by the oil cooler, so that the two-stage oil-cooled screw compressor Are supplied to each bearing.

上述した従来の２段スクリュ冷凍機の場合、冷却媒体が冷却水か液冷媒かの差異はあるものの、いずれも油冷却器が設けられており、これにより構造が複雑になり、嵩高になるとともに、メンテナンスの作業も増大するという問題がある。
本発明は、斯か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、構造の単純化、小型化、メンテナンスの負担軽減等を可能とした２段スクリュ冷凍機を提供しようとするものである。 In the case of the conventional two-stage screw refrigerator described above, although there is a difference between the cooling medium and the cooling water or the liquid refrigerant, an oil cooler is provided in each case, which makes the structure complicated and bulky. There is a problem that maintenance work increases.
The present invention has been made with the object of eliminating such conventional problems, and an object of the present invention is to provide a two-stage screw refrigerator capable of simplifying the structure, reducing the size, reducing the maintenance burden, and the like. .

上記課題を解決するために、第１発明は、
互いに噛み合う雌雄一対の第１段スクリュロータ及び第２段スクリュロータを有する２段油冷式スクリュ圧縮機に加えて、油分離回収器、凝縮器、膨張弁及び蒸発器を含む冷媒循環流路と、上記油分離回収器内の油を上記２段油冷式スクリュ圧縮機内の少なくとも軸受、軸封部を含む油供給箇所に導く油流路とを備えた２段スクリュ冷凍機において、
上記第１段スクリュロータと上記第２段スクリュロータとの間の中間段部に位置する中間油だまりを備え、
上記冷媒循環流路における上記凝縮器と上記膨張弁との間から分岐して絞り手段を経て、その絞り手段から直接、上記中間油だまりに通じる分岐流路を設け、上記分岐流路に分流した冷媒液を上記絞り手段を経て上記中間油だまりに流入させるよう構成した。 In order to solve the above problems, the first invention is:
In addition to a two-stage oil-cooled screw compressor having a pair of male and female first-stage screw rotors and second-stage screw rotors engaged with each other, a refrigerant circulation passage including an oil separation and recovery unit, a condenser, an expansion valve, and an evaporator, A two-stage screw refrigerator comprising an oil flow path for guiding the oil in the oil separation and recovery unit to at least a bearing in the two-stage oil-cooled screw compressor and an oil supply location including a shaft seal portion,
An intermediate oil sump located at an intermediate stage between the first stage screw rotor and the second stage screw rotor;
Through the branch to the throttle means from between the condenser and the expansion valve in the refrigerant circulation flow path, directly from the throttle means, it is provided a branch flow passage communicating with the intermediate oil reservoir, and diverted into the branch channel The refrigerant liquid is configured to flow into the intermediate oil reservoir through the throttle means .

第２発明は、第１発明の構成に加えて、上記冷媒循環流路における上記２段油冷式スクリュ圧縮機の吐出側で、上記凝縮器の一次側の部分に、ここでの流路内温度を検出し、且つ上記流路内温度が設定温度になるように上記絞り手段の開度を調整する温度検出器を設けた構成とした。 The second invention, in addition to the configuration of the first invention, the discharge side of the two-stage oil-cooled screw compressor in the refrigerant circulation flow path, the primary side of the portion of the condenser, the flow path here A temperature detector is provided that detects the internal temperature and adjusts the opening of the throttle means so that the flow path internal temperature becomes a set temperature.

第１発明に係る２段スクリュ冷凍機によれば、上記第１段スクリュロータと上記第２段スクリュロータとそれらの間の中間段部のうちのいずれかで冷媒ガスが冷却される故、冷媒ガスの冷却のために必要であった油の冷却用の油冷却器を省くことができ、構造の単純化、小型化、メンテナンスの負担軽減等が可能になるという効果を奏する。   According to the two-stage screw refrigerator according to the first invention, the refrigerant gas is cooled at any one of the first-stage screw rotor, the second-stage screw rotor, and the intermediate stage portion between them. The oil cooler for cooling the oil required for cooling the gas can be omitted, and the structure can be simplified, the size can be reduced, and the maintenance burden can be reduced.

また、上記第１段スクリュロータと上記第２段スクリュロータとの間の中間段部に位置する中間油だまりで油が冷却されるとともに、冷媒ガスが冷却される故、やはり油冷却器を省くことができ、構造の単純化、小型化、メンテナンスの負担軽減等が可能になるという効果を奏する。 Further , the oil is cooled by the intermediate oil sump located at the intermediate stage between the first stage screw rotor and the second stage screw rotor, and the refrigerant gas is cooled, so that the oil cooler is also omitted. It is possible to simplify the structure, reduce the size, reduce the burden of maintenance, and the like.

第２発明に係る２段スクリュ冷凍機によれば、第１発明による効果に加えて、２段油冷式スクリュ圧縮機の吐出側の流路内温度が設定温度になるように、油流路から２段油冷式スクリュ圧縮機内の油供給箇所に供給する油の温度を適温にすることが可能になるという効果を奏する。 According to the two-stage screw refrigerator according to the second aspect of the invention, in addition to the effect of the first aspect , the oil flow path is such that the temperature in the flow path on the discharge side of the two-stage oil-cooled screw compressor becomes the set temperature. From the above, there is an effect that the temperature of the oil supplied to the oil supply location in the two-stage oil-cooled screw compressor can be set to an appropriate temperature.

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１発明に係る２段スクリュ冷凍装置１Ａを示し、この２段スクリュ冷凍装置１Ａは、２段油冷式スクリュ圧縮機１１、油分離回収器１２、凝縮器１３、膨張弁１４及び蒸発器１５を含む冷媒循環流路Iと、油分離回収器１２内の油、即ちその下部の油溜まり部１６における油を２段油冷式スクリュ圧縮機１１内の後述する油供給箇所に導く油流路IIと、冷媒循環流路Iにおける凝縮器１３と膨張弁１４との間の部分から分岐し、絞り手段１７が介設された分岐流路IIIとを備えている。 Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a two-stage screw refrigeration apparatus 1A according to the first invention . This two-stage screw refrigeration apparatus 1A includes a two-stage oil-cooled screw compressor 11, an oil separation and recovery unit 12, a condenser 13, an expansion valve 14, and The refrigerant circulation path I including the evaporator 15 and the oil in the oil separator / recovery unit 12, that is, the oil in the oil sump 16 at the lower part thereof, are guided to an oil supply point (described later) in the two-stage oil-cooled screw compressor 11. An oil flow path II and a branch flow path III branched from a portion between the condenser 13 and the expansion valve 14 in the refrigerant circulation flow path I and provided with a throttle means 17 are provided.

２段油冷式スクリュ圧縮機１１は、一方に吸込口２１、他方に吐出口２２が形成された圧縮機ケーシング２３内に互いに噛み合う雌雄一対の第１段スクリュロータ２４及び第２段スクリュロータ２５を有し、第１段スクリュロータ２４と第２段スクリュロータ２５との間、即ち第１段スクリュロータ２４の吐出部２６と第２段スクリュロータ２５の吸込み部２７との間の中間段部２８には油が溜められた中間油だまり２９が形成されている。また、これらの第１段スクリュロータ２４及び第２段スクリュロータ２５は、軸受・軸封部３１，３２，３３にて回転可能に支持されるとともに、第１段スクリュロータ２４の一方のロータと第２段スクリュロータ２５の一方のロータとは、ロータ軸を共有し、同軸回転可能となっている。さらに、２段油冷式スクリュ圧縮機１１の駆動部であるモータ４１のモーターケーシング４２はこれと一体的に結合された圧縮機ケーシング２３とともに半密閉構造を形成し、モーターケーシング４２内には、第１段スクリュロータ２４の上記一方のロータと軸を共有する回転子４３とこれを包囲する固定子４４とが収容されている。従って、この一方のロータの軸はモータ４１の出力軸にもなっており、この一方のロータ及び第２段スクリュロータ２５の上記一方のロータを介してモータ４１により第１段スクリュロータ２４及び第２段スクリュロータ２５が回転駆動される。   The two-stage oil-cooled screw compressor 11 has a pair of male and female first-stage screw rotors 24 and second-stage screw rotors 25 that mesh with each other in a compressor casing 23 having a suction port 21 on one side and a discharge port 22 on the other side. Intermediate stage between the first stage screw rotor 24 and the second stage screw rotor 25, that is, between the discharge part 26 of the first stage screw rotor 24 and the suction part 27 of the second stage screw rotor 25. An intermediate oil sump 29 in which oil is stored is formed at 28. The first-stage screw rotor 24 and the second-stage screw rotor 25 are rotatably supported by bearing / shaft sealing portions 31, 32, 33, and one rotor of the first-stage screw rotor 24 One rotor of the second stage screw rotor 25 shares the rotor shaft and is coaxially rotatable. Further, the motor casing 42 of the motor 41 that is the drive unit of the two-stage oil-cooled screw compressor 11 forms a semi-hermetic structure together with the compressor casing 23 that is integrally coupled with the motor casing 42. A rotor 43 sharing a shaft with the one rotor of the first stage screw rotor 24 and a stator 44 surrounding the rotor 43 are accommodated. Accordingly, the shaft of this one rotor is also the output shaft of the motor 41, and the first stage screw rotor 24 and the second stage rotor are driven by the motor 41 through this one rotor and the one rotor of the second stage screw rotor 25. The two-stage screw rotor 25 is driven to rotate.

一方、本実施形態では、油流路IIは油溜まり部１６から油を軸受・軸封部３１，３２，３３に加え、第１段スクリュロータ２４及び第２段スクリュロータ２５により形成されるガス圧縮空間のそれぞれに導いている。ここで、ガス圧縮空間はガス圧縮過程にある空間である故、吸込口２１、吐出部２６、吸込み部２７、吐出口２２には連通していない状態となっている。また、分岐流路IIIは絞り手段１７を経て、中間油だまり２９に通じている。なお、この絞り手段１７としては、絞り作用を有するものであればよく、例えばオリフィス、固定絞り弁、可変絞り弁が含まれる。   On the other hand, in the present embodiment, the oil flow path II adds oil from the oil reservoir 16 to the bearing / shaft seals 31, 32, 33, and is formed by the first stage screw rotor 24 and the second stage screw rotor 25. Leads to each of the compression spaces. Here, since the gas compression space is a space in the gas compression process, the gas compression space is not in communication with the suction port 21, the discharge unit 26, the suction unit 27, and the discharge port 22. Further, the branch flow path III communicates with the intermediate oil reservoir 29 through the throttle means 17. The throttling means 17 may be any means having a throttling action, and includes, for example, an orifice, a fixed throttle valve, and a variable throttle valve.

そして、上記構成からなる２段スクリュ冷凍装置１Ａにおいて、２段油冷式スクリュ圧縮機１１の吸込口２１から吸込まれた冷媒ガスは、油流路IIからの油注入下で圧縮され、吐出部２６から油を伴って中間段部２８に吐出される。さらに、この油を伴った冷媒ガスは、吸込み部２７より第２段スクリュロータ２５に吸込まれ、油流路IIからの油注入下で圧縮され、油とともに吐出口２２から油分離回収器１２に向けて吐出される。軸受・軸封部３１，３２，３３に供給された油も油分離回収器１２に戻され、この油分離回収器１２で冷媒ガスと油とが分離され、油は一旦油溜まり部１６に溜められ、油除去された冷媒ガスは油分離回収器１２の上部から延びる冷媒循環流路Iの部分に送り出される。   In the two-stage screw refrigeration apparatus 1A having the above-described configuration, the refrigerant gas sucked from the suction port 21 of the two-stage oil-cooled screw compressor 11 is compressed under oil injection from the oil passage II, and is discharged from the discharge section. 26 is discharged to the intermediate step portion 28 with oil. Further, the refrigerant gas accompanied by the oil is sucked into the second stage screw rotor 25 from the suction portion 27 and compressed under the oil injection from the oil flow path II, and is discharged together with the oil from the discharge port 22 to the oil separator / collector 12. It is discharged toward. The oil supplied to the bearing / shaft seals 31, 32, 33 is also returned to the oil separation / recovery unit 12, where the refrigerant gas and oil are separated by the oil separation / recovery unit 12. Then, the refrigerant gas from which the oil has been removed is sent out to a portion of the refrigerant circulation channel I extending from the upper part of the oil separator / recovery unit 12.

油溜まり部１６の油は油流路IIにより軸受・軸封部３１，３２，３３に供給されるとともに、第１段のスクリュロータ２４及び第２段スクリュロータ２５により形成されるガス圧縮空間のそれぞれに導かれた後、油分離回収器１２に回収されて、繰返し循環使用に供される。   The oil in the oil reservoir 16 is supplied to the bearing / shaft seals 31, 32, and 33 through the oil flow path II, and in the gas compression space formed by the first stage screw rotor 24 and the second stage screw rotor 25. After being guided to each, it is recovered by the oil separator / collector 12 and repeatedly used for circulation.

これに対して、油分離回収器１２を出た冷媒ガスは、凝縮器１３で低温熱源、例えば水により熱を奪われ、凝縮し、冷媒液となって凝縮器１３から分岐流路IIIの分岐点に至り、ここで冷媒液の一部が分岐流路IIIに分流し、その残りが膨張弁１４に向かう。膨張弁１４に向かった冷媒液ガスは、膨張弁１４を経て部分的にガス状態になるとともに温度を下げた後、蒸発器１５で高温熱源から熱を奪い、完全に蒸発し、ガス状態になって２段スクリュ冷凍装置１Ａの吸込口２１に戻る。また、分岐流路IIIに分流した冷媒液は絞り手段１７を経て温度を下げ部分的にガス状態になるとともに温度を下げ、中間油だまり２９に流入し、ここの油温を低下させると同時に完全にガス状態となって中間段部２８にて吐出部２６から吸込み部２７に向かう油を伴った冷媒ガスに合流する。この結果、中間油だまり２９の油が冷却されると同時に、中間段部２８にて油及び冷媒ガスも冷却される。   On the other hand, the refrigerant gas exiting the oil separator / recovery unit 12 is deprived of heat by a condenser 13 by a low-temperature heat source, for example, water, condenses, and becomes a refrigerant liquid to branch from the condenser 13 to the branch channel III. At this point, a part of the refrigerant liquid is diverted to the branch flow path III, and the rest is directed to the expansion valve 14. The refrigerant liquid gas directed to the expansion valve 14 is partially in a gas state through the expansion valve 14 and lowered in temperature, and then is deprived of heat from a high-temperature heat source by the evaporator 15 and completely evaporated to be in a gas state. Return to the suction port 21 of the two-stage screw refrigeration apparatus 1A. In addition, the refrigerant liquid branched into the branch flow path III is reduced in temperature through the throttle means 17 to partially become a gas state and at the same time the temperature is lowered and flows into the intermediate oil sump 29. In the middle stage portion 28, the gas flows into the refrigerant gas accompanied by the oil from the discharge portion 26 toward the suction portion 27. As a result, the oil in the intermediate oil pool 29 is cooled, and at the same time, the oil and the refrigerant gas are cooled in the intermediate step portion 28.

このように、この２段スクリュ冷凍装置１Ａでは、分岐流路IIIからの冷媒により中間油だまり２９の油を冷却すると同時に、中間段部２８にて油及び冷媒ガスが冷却されるため、従来のように油流路IIに油冷却器を設ける必要がなくなり、構造が単純化、小型化され、メンテナンスの負担軽減も可能となっている。   As described above, in the two-stage screw refrigeration apparatus 1A, the oil and the refrigerant gas are cooled in the intermediate stage portion 28 at the same time as the oil in the intermediate oil pool 29 is cooled by the refrigerant from the branch flow path III. Thus, there is no need to provide an oil cooler in the oil flow path II, the structure is simplified and miniaturized, and the maintenance burden can be reduced.

図２は、参考例１に係る２段スクリュ冷凍装置１Ｂを示し、この２段スクリュ冷凍装置１Ｂにおいて、上述した２段スクリュ冷凍装置１Ａ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２段スクリュ冷凍装置１Ｂでは、冷媒循環流路Iにおける凝縮器１３と膨張弁１４との間の部分から分岐し、絞り手段１７が介設された分岐流路IVを備えており、この分岐流路IVは中間油だまり２９に代えて、第１段スクリュロータ２４により形成されるガス圧縮空間に通じている。そして、斯かる構成により、このガス圧縮空間での冷却作用により上記同様、油冷却器が不要になり、構造の単純化、小型化され、メンテナンスの負担軽減が可能になるとともに、ガス圧縮動力が低減される。 Figure 2 shows a two-stage screw refrigerating device 1B according to the reference example 1, in this two-stage screw refrigerating device 1B, the parts common to each other and two-stage screw refrigerating device 1A described above are given the same number Description Is omitted.
The two-stage screw refrigeration apparatus 1B includes a branch channel IV that branches from a portion of the refrigerant circulation channel I between the condenser 13 and the expansion valve 14 and in which a throttle means 17 is interposed. The channel IV communicates with a gas compression space formed by the first stage screw rotor 24 instead of the intermediate oil reservoir 29. With this configuration, the cooling action in the gas compression space eliminates the need for an oil cooler, simplifies the structure, reduces the maintenance burden, and reduces the gas compression power. Reduced.

図３は、参考例２に係る２段スクリュ冷凍装置１Ｃを示し、この２段スクリュ冷凍装置１Ｃにおいて、上述した２段スクリュ冷凍装置１Ａと互いに共通する部分については、同一符号を付して説明を省略する。
この２段スクリュ冷凍装置１Ｃでは、冷媒循環路Iにおける凝縮器１３と膨張弁１４との間の部分から分岐し、絞り手段１７が介設された分岐流路Vを備えており、この分岐流路Vは中間油だまり２９に代えて、第２段スクリュロータ２５により形成されるガス圧縮空間に通じている。そして、斯かる構成によって、このガス圧縮空間での冷却作用により上記同様、油冷却器が不要になり、構造の単純化、小型化及びメンテナンスの負担軽減が可能になるとともに、ガス圧縮動力が低減される。 FIG. 3 shows a two-stage screw refrigeration apparatus 1C according to Reference Example 2. In this two-stage screw refrigeration apparatus 1C, parts common to the above-described two-stage screw refrigeration apparatus 1A are denoted by the same reference numerals and described. Is omitted.
This two-stage screw refrigeration apparatus 1C includes a branch flow path V that branches from a portion of the refrigerant circuit I between the condenser 13 and the expansion valve 14 and that is provided with a throttle means 17. The path V leads to a gas compression space formed by the second stage screw rotor 25 instead of the intermediate oil sump 29. Such a configuration eliminates the need for an oil cooler due to the cooling action in the gas compression space, simplifies the structure, reduces the size of the maintenance load, and reduces the gas compression power. Is done.

図４は第２発明に係る２段スクリュ冷凍装置１Ｄを示し、この２段スクリュ冷凍装置１Ｄにおいて、上述した２段スクリュ冷凍装置１Ａ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２段スクリュ冷凍装置１Ｄでは、絞り手段１７を膨張弁にするとともに、冷媒循環流路Iにおける２段油冷式スクリュ圧縮機１１の吐出側で、凝縮器１３の一次側の部分、例えば図示するように、この第１実施形態では、２段油冷式スクリュ圧縮機１１と油分離回収器１２との間の部分に温度検出器５１が温度検出可能に設けられている。そして、この部分の流路内温度が設定温度、例えば４０〜６０℃の所望温度になるように温度検出器５１により絞り手段１７の開度調整がなされ、油流路IIから２段油冷式スクリュ圧縮機１１内の油供給箇所に供給する油の温度を適温にすることが可能となっている。 FIG. 4 shows a two-stage screw refrigeration apparatus 1D according to the second invention . In this two-stage screw refrigeration apparatus 1D, parts common to the above-described two-stage screw refrigeration apparatus 1A are given the same reference numerals for explanation. Omitted.
In the two-stage screw refrigeration apparatus 1D, the throttle means 17 is an expansion valve, and the primary side portion of the condenser 13 on the discharge side of the two-stage oil-cooled screw compressor 11 in the refrigerant circulation channel I, for example, illustrated As described above, in the first embodiment, the temperature detector 51 is provided in a portion between the two-stage oil-cooled screw compressor 11 and the oil separator / collector 12 so that the temperature can be detected. Then, the opening degree of the throttle means 17 is adjusted by the temperature detector 51 so that the temperature in the flow path of this portion becomes a set temperature, for example, a desired temperature of 40 to 60 ° C., and the two-stage oil cooling type is performed from the oil flow path II. The temperature of the oil supplied to the oil supply location in the screw compressor 11 can be set to an appropriate temperature.

図５は参考例３に係る２段スクリュ冷凍装置１Ｅを示し、この２段スクリュ冷凍装置１Ｅにおいて、上述した２段スクリュ冷凍装置１Ｂ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２段スクリュ冷凍装置１Ｅでは、２段スクリュ冷凍装置１Ｄと同様、絞り手段１７を膨張弁にするとともに、冷媒循環流路Iにおける２段油冷式スクリュ圧縮機１１の吐出側で、凝縮器１３の一次側の部分、例えば図示するように、この第２実施形態では、２段油冷式スクリュ圧縮機１１と油分離回収器１２との間の部分に温度検出器５１が温度検出可能に設けられている。そして、この部分の流路内温度が設定温度、例えば４０〜６０℃の所望温度になるように温度検出器５１により絞り手段１７の開度調整がなされ、油流路IIから２段油冷式スクリュ圧縮機１１内の油供給箇所に供給する油の温度を適温にすることが可能となっている。 FIG. 5 shows a two-stage screw refrigeration apparatus 1E according to Reference Example 3. In this two-stage screw refrigeration apparatus 1E, parts common to the above-described two-stage screw refrigeration apparatus 1B are given the same reference numerals and described. Omitted.
In the two-stage screw refrigeration apparatus 1E, as in the two-stage screw refrigeration apparatus 1D, the throttle means 17 is an expansion valve, and a condenser is provided on the discharge side of the two-stage oil-cooled screw compressor 11 in the refrigerant circulation passage I. 13, for example, as shown in the figure, in this second embodiment, the temperature detector 51 can detect the temperature in the portion between the two-stage oil-cooled screw compressor 11 and the oil separator / collector 12. Is provided. Then, the opening degree of the throttle means 17 is adjusted by the temperature detector 51 so that the temperature in the flow path of this portion becomes a set temperature, for example, a desired temperature of 40 to 60 ° C., and the two-stage oil cooling type is performed from the oil flow path II. The temperature of the oil supplied to the oil supply location in the screw compressor 11 can be set to an appropriate temperature.

第１発明に係る２段スクリュ冷凍装置の全体構成を示す図である。It is a figure which shows the whole structure of the two-stage screw freezing apparatus which concerns on 1st invention . 参考例１に係る２段スクリュ冷凍装置の全体構成を示す図である。It is a figure which shows the whole structure of the two-stage screw freezing apparatus which concerns on the reference example 1. FIG. 参考例２に係る２段スクリュ冷凍装置の全体構成を示す図である。It is a figure which shows the whole structure of the two-stage screw freezing apparatus which concerns on the reference example 2. FIG. 第２発明に係る２段スクリュ冷凍装置の全体構成を示す図である。It is a figure which shows the whole structure of the two-stage screw freezing apparatus which concerns on 2nd invention . 参考例３に係る２段スクリュ冷凍装置の全体構成を示す図である。It is a figure which shows the whole structure of the two-stage screw freezing apparatus which concerns on the reference example 3. FIG.

１Ａ，１Ｂ，１Ｃ，１Ｄ，１Ｅ ２段スクリュ冷凍装置
１１ ２段油冷式スクリュ圧縮機
１２ 油分離回収器
１３ 凝縮器
１４ 膨張弁
１５ 蒸発器
１６ 油溜まり部
１７ 絞り手段
２１ 吸込口
２２ 吐出口
２３ 圧縮機ケーシング
２４ 第１段スクリュロータ
２５ 第２段スクリュロータ
２６ 吐出部
２７ 吸込み部
２８ 中間段部
２９ 中間油だまり
３１，３２，３３ 軸受・軸封部
４１ モータ
４２ モーターケーシング
４３ 回転子
４４ 固定子
５１ 温度検出器
I 冷媒循環流路
II 油流路
III 分岐流路
IV 分岐流路
V 分岐流路 1A, 1B, 1C, 1D, 1E Two-stage screw refrigeration unit 11 Two-stage oil-cooled screw compressor 12 Oil separation and recovery unit 13 Condenser 14 Expansion valve 15 Evaporator 16 Oil reservoir 17 Throttle means 21 Suction port 22 Discharge port 23 Compressor casing 24 First stage screw rotor 25 Second stage screw rotor 26 Discharge part 27 Suction part 28 Intermediate stage part 29 Middle oil sump 31, 32, 33 Bearing / shaft seal part 41 Motor 42 Motor casing 43 Rotor 44 Fixed Child 51 Temperature detector
I Refrigerant circulation flow path
II Oil flow path
III Branch channel
IV branch flow path
V branch flow path

Claims (2)

互いに噛み合う雌雄一対の第１段スクリュロータ及び第２段スクリュロータを有する２段油冷式スクリュ圧縮機に加えて、油分離回収器、凝縮器、膨張弁及び蒸発器を含む冷媒循環流路と、上記油分離回収器内の油を上記２段油冷式スクリュ圧縮機内の少なくとも軸受、軸封部を含む油供給箇所に導く油流路とを備えた２段スクリュ冷凍機において、
上記第１段スクリュロータと上記第２段スクリュロータとの間の中間段部に位置する中間油だまりを備え、
上記冷媒循環流路における上記凝縮器と上記膨張弁との間から分岐して絞り手段を経て、その絞り手段から直接、上記中間油だまりに通じる分岐流路を設け、上記分岐流路に分流した冷媒液を上記絞り手段を経て上記中間油だまりに流入させるよう構成したことを特徴とする２段スクリュ冷凍機。 In addition to a two-stage oil-cooled screw compressor having a pair of male and female first-stage screw rotors and second-stage screw rotors engaged with each other, a refrigerant circulation passage including an oil separation and recovery unit, a condenser, an expansion valve, and an evaporator, A two-stage screw refrigerator comprising an oil flow path for guiding the oil in the oil separation and recovery unit to at least a bearing in the two-stage oil-cooled screw compressor and an oil supply location including a shaft seal portion,
An intermediate oil sump located at an intermediate stage between the first stage screw rotor and the second stage screw rotor;
Through the branch to the throttle means from between the condenser and the expansion valve in the refrigerant circulation flow path, directly from the throttle means, it is provided a branch flow passage communicating with the intermediate oil reservoir, and diverted into the branch channel A two-stage screw refrigerator configured to allow a refrigerant liquid to flow into the intermediate oil reservoir through the throttle means . 上記冷媒循環流路における上記２段油冷式スクリュ圧縮機の吐出側で、上記凝縮器の一次側の部分に、ここでの流路内温度を検出し、且つ上記流路内温度が設定温度になるように上記絞り手段の開度を調整する温度検出器を設けたことを特徴とする請求項１に記載の２段スクリュ冷凍機。 On the discharge side of the two-stage oil-cooled screw compressor in the refrigerant circulation flow path, the temperature in the flow path is detected at the primary side portion of the condenser, and the temperature in the flow path is a set temperature. The two-stage screw refrigerator according to claim 1, further comprising a temperature detector for adjusting the opening degree of the throttle means.
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