JP2003013875A - Two-stage compression type compressor and refrigerating device using it - Google Patents
Two-stage compression type compressor and refrigerating device using itInfo
- Publication number
- JP2003013875A JP2003013875A JP2001199103A JP2001199103A JP2003013875A JP 2003013875 A JP2003013875 A JP 2003013875A JP 2001199103 A JP2001199103 A JP 2001199103A JP 2001199103 A JP2001199103 A JP 2001199103A JP 2003013875 A JP2003013875 A JP 2003013875A
- Authority
- JP
- Japan
- Prior art keywords
- stage
- refrigerant
- suction port
- path
- pressure
- 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.)
- Granted
Links
- 230000006835 compression Effects 0.000 title claims abstract description 41
- 238000007906 compression Methods 0.000 title claims abstract description 41
- 239000003507 refrigerant Substances 0.000 claims abstract description 90
- 238000010257 thawing Methods 0.000 claims description 35
- 238000005057 refrigeration Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000007423 decrease Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、二段圧縮型圧縮機
およびそれを用いた冷凍装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stage compression type compressor and a refrigeration system using the same.
【０００２】[0002]
【従来の技術】一般に、一段目で中間圧に圧縮された冷
媒を二段目の吸込みポートに直接導く第一の経路と、一
段目で中間圧に圧縮された冷媒をシェルケース内に吐出
し、このシェルケース内を通して二段目の吸込みポート
に導く第二の経路とを有し、各経路を通して二段目の吸
込みポートに導かれた中間圧の冷媒を、この二段目で高
圧に圧縮して吐出する構成を有した二段圧縮型圧縮機が
知られている。2. Description of the Related Art Generally, a first path for directly guiding a refrigerant compressed to an intermediate pressure in a first stage to a suction port in a second step and a refrigerant compressed to an intermediate pressure in a first step are discharged into a shell case. , A second path that leads to the second-stage suction port through the shell case, and compresses the intermediate-pressure refrigerant that is guided to the second-stage suction port through each path to a high pressure in the second-stage. There is known a two-stage compression type compressor having a configuration for discharging the liquid.
【０００３】この二段圧縮型圧縮機においては、第一の
経路を通して二段目の吸込みポートに導かれた冷媒と、
第二の経路を通して二段目の吸込みポートに導かれた冷
媒とで、オイル混合比率が異なるのが一般的であり、第
一の経路を経た場合、第二の経路を経た場合に比べてオ
イル混合比率が高くなる。In this two-stage compression type compressor, the refrigerant introduced to the second-stage suction port through the first path,
Generally, the oil mixing ratio is different between the refrigerant introduced to the second-stage suction port through the second path, and the oil ratio is different when passing through the first path than when passing through the second path. The mixing ratio becomes high.
【０００４】この二段圧縮型圧縮機の使用形態によって
は圧縮機からの吐出冷媒に対するオイル混合比率を加減
することが必要になる場合がある。Depending on the usage of this two-stage compression type compressor, it may be necessary to adjust the oil mixing ratio to the refrigerant discharged from the compressor.
【０００５】[0005]
【発明が解決しようとする課題】しかし、従来の二段圧
縮型圧縮機では、吐出された冷媒に対するオイル混合比
率を加減することができないという問題がある。However, the conventional two-stage compression type compressor has a problem that the oil mixing ratio with respect to the discharged refrigerant cannot be adjusted.
【０００６】例えば、この二段圧縮型圧縮機が冷凍装置
に使用され、この冷凍装置が屋外に設置された場合、冬
期等において、蒸発器の除霜運転が必要になる。For example, when this two-stage compression type compressor is used in a refrigerating apparatus and the refrigerating apparatus is installed outdoors, the defrosting operation of the evaporator is required in winter and the like.
【０００７】この場合の除霜運転では、圧縮機から吐出
された冷媒を、凝縮器および減圧装置をバイパスして蒸
発器に直接的に供給し、この蒸発器を冷媒熱により加熱
して除霜するホットガス除霜が一般的である。In the defrosting operation in this case, the refrigerant discharged from the compressor is directly supplied to the evaporator by bypassing the condenser and the pressure reducing device, and the evaporator is heated by the heat of the refrigerant to defrost it. Hot gas defrosting is commonly used.
【０００８】このホットガス除霜を行う場合、高圧ガス
を低圧側蒸発器に供給することになるため、高低圧差の
減少によって冷媒を圧縮する仕事が減少する代わりにオ
イルが汲み出され、圧縮機からのオイル吐出量が増大す
る。この場合の圧縮機が、従来の二段圧縮型圧縮機であ
った場合、吐出冷媒に対するオイル混合比率を加減する
ことができないため、オイル吐出量が増大しすぎて、通
常運転再開時の圧縮機性能が低下するという問題があ
る。When this hot gas defrosting is performed, high-pressure gas is supplied to the low-pressure side evaporator, so that the work of compressing the refrigerant is reduced by the reduction of the high-low pressure difference, but the oil is pumped out, and the compressor is compressed. The amount of oil discharged from is increased. When the compressor in this case is a conventional two-stage compression type compressor, the oil mixing ratio to the discharge refrigerant cannot be adjusted, so the oil discharge amount increases too much and the compressor when restarting normal operation There is a problem of reduced performance.
【０００９】一方、二段圧縮型圧縮機が使用された冷凍
装置において、上記高圧ガスが低圧側の蒸発器に供給さ
れてホットガス除霜運転が行われた場合、高圧側の熱交
換器に冷媒の流れがなくなり、その温度が低下するた
め、通常運転再開時の定常運転に移行するまでの時間が
長くかかるという問題がある。On the other hand, in a refrigeration system using a two-stage compression type compressor, when the high pressure gas is supplied to the low pressure side evaporator to perform the hot gas defrosting operation, the high pressure side heat exchanger is used. There is a problem that it takes a long time to shift to the steady operation when the normal operation is resumed because the flow of the refrigerant is stopped and the temperature of the refrigerant is decreased.
【００１０】そこで、本発明の目的は、上述した従来の
技術が有する課題を解消し、吐出冷媒に対するオイル混
合比率を調整することができる二段圧縮型圧縮機および
それを用いた冷凍装置を提供することにある。Therefore, an object of the present invention is to provide a two-stage compression type compressor and a refrigerating apparatus using the same which can solve the problems of the above-mentioned conventional techniques and can adjust the oil mixing ratio to the discharged refrigerant. To do.
【００１１】また、ホットガス除霜運転が行われた場
合、その除霜運転終了後に、通常運転再開時の定常運転
に移行するまでの時間短縮を図ることのできる二段圧縮
型圧縮機を用いた冷凍装置を提供することにある。In addition, when the hot gas defrosting operation is performed, a two-stage compression type compressor is used which can shorten the time until the steady operation is resumed when the normal operation is resumed after the defrosting operation is completed. The purpose of this is to provide a refrigerating device.
【００１２】[0012]
【課題を解決するための手段】請求項１記載の発明は、
一段目で中間圧に圧縮された冷媒を二段目の吸込みポー
トに直接導く第一の経路と、一段目で中間圧に圧縮され
た冷媒をシェルケース内に吐出し、このシェルケース内
を通して二段目の吸込みポートに導く第二の経路とを有
し、各経路を通して二段目の吸込みポートに導かれた中
間圧の冷媒を、この二段目で高圧に圧縮して吐出する構
成を有した二段圧縮型圧縮機において、上記第一の経路
に二段目の吸込みポートに直接導かれる冷媒量を調整す
る調整弁を設けたことを特徴とする。The invention according to claim 1 is
The first path, which directly guides the refrigerant compressed to the intermediate pressure in the first stage, to the suction port in the second step, and the refrigerant compressed to the intermediate pressure in the first step, are discharged into the shell case, and are passed through this shell case. It has a second path leading to the suction port of the second stage, and has a configuration in which the intermediate-pressure refrigerant guided to the suction port of the second stage through each path is compressed to high pressure in the second stage and discharged. In the above two-stage compression type compressor, an adjusting valve for adjusting the amount of refrigerant directly introduced to the second-stage suction port is provided in the first path.
【００１３】請求項２記載の発明は、二段圧縮型圧縮機
であって、一段目で中間圧に圧縮された冷媒を二段目の
吸込みポートに直接導く第一の経路と、一段目で中間圧
に圧縮された冷媒をシェルケース内に吐出し、このシェ
ルケース内を通して二段目の吸込みポートに導く第二の
経路とを有し、各経路を通して二段目の吸込みポートに
導かれた中間圧の冷媒を、この二段目で高圧に圧縮して
吐出する構成を有した二段圧縮型圧縮機を備えた冷凍装
置において、上記第一の経路に二段目の吸込みポートに
直接導かれる冷媒量を調整する調整弁を設けたことを特
徴とする。According to a second aspect of the present invention, there is provided a two-stage compression type compressor, wherein the first stage directly introduces the refrigerant compressed to the intermediate pressure to the second-stage suction port, and the first-stage compressor. The refrigerant compressed to an intermediate pressure is discharged into the shell case, and has a second path that leads to the second-stage suction port through the shell case, and is guided to the second-stage suction port through each path. In a refrigeration system equipped with a two-stage compression type compressor having a structure in which an intermediate-pressure refrigerant is compressed to a high pressure in the second stage and discharged, the refrigerant is directly introduced to the second-stage suction port in the first path. It is characterized in that an adjusting valve for adjusting the amount of refrigerant to be discharged is provided.
【００１４】請求項３記載の発明は、請求項２記載のも
のにおいて、二段目の吐出ポートから吐出された高圧冷
媒を蒸発器に供給する除霜経路を有し、この除霜経路を
通じた除霜運転時に上記調整弁を閉じる手段を備えたこ
とを特徴とする。According to a third aspect of the present invention, in the second aspect, there is provided a defrosting route for supplying the high-pressure refrigerant discharged from the second-stage discharge port to the evaporator, and the defrosting route is used. It is characterized in that a means for closing the adjusting valve at the time of defrosting operation is provided.
【００１５】これらの発明では、第一の経路に二段目の
吸込みポートに直接導かれる冷媒量を調整する調整弁を
設けたために、例えば、この調整弁の弁開度を絞り気味
にすれば、第一の経路を流れる冷媒量が減って、第二の
経路を流れる冷媒量が増大する。この第二の経路を流れ
る冷媒に対するオイル混合比率は、第一の冷媒経路を流
れる冷媒のそれよりも小さいため、圧縮機の二段目の吐
出ポートから吐出される全体のオイル量が減少する。こ
れに対し、調整弁の弁開度を開き気味にすれば、第一の
経路を流れる冷媒量が増大し、それに伴って、第二の経
路を流れる冷媒量が減少する。この場合、圧縮機の二段
目の吐出ポートから吐出される全体のオイル量が増大す
る。In these inventions, since the adjusting valve for adjusting the amount of the refrigerant directly guided to the second-stage suction port is provided in the first passage, for example, if the valve opening degree of this adjusting valve is throttled slightly. The amount of refrigerant flowing through the first route decreases, and the amount of refrigerant flowing through the second route increases. Since the oil mixing ratio with respect to the refrigerant flowing through the second path is smaller than that of the refrigerant flowing through the first refrigerant path, the total amount of oil discharged from the second-stage discharge port of the compressor decreases. On the other hand, if the valve opening degree of the adjusting valve is opened slightly, the amount of the refrigerant flowing through the first route increases, and accordingly, the amount of the refrigerant flowing through the second route decreases. In this case, the total amount of oil discharged from the second-stage discharge port of the compressor increases.
【００１６】請求項４記載の発明は、二段圧縮型圧縮機
であって、一段目で中間圧に圧縮された冷媒を二段目の
吸込みポートに直接導く第一の経路と、一段目で中間圧
に圧縮された冷媒をシェルケース内に吐出し、このシェ
ルケース内を通して二段目の吸込みポートに導く第二の
経路とを有し、各経路を通して二段目の吸込みポートに
導かれた中間圧の冷媒を、この二段目で高圧に圧縮して
吐出する構成を有した二段圧縮型圧縮機を備えた冷凍装
置において、上記二段目の吸込みポートに吸い込まれる
中間圧冷媒の一部を蒸発器に供給する除霜経路を備えた
ことを特徴とするものである。According to a fourth aspect of the present invention, there is provided a two-stage compression type compressor, wherein the first passage directly guides the refrigerant compressed to the intermediate pressure to the second-stage suction port, and the first-stage compressor. The refrigerant compressed to an intermediate pressure is discharged into the shell case, and has a second path that leads to the second-stage suction port through the shell case, and is guided to the second-stage suction port through each path. In a refrigerating apparatus including a two-stage compression type compressor having a configuration in which an intermediate-pressure refrigerant is compressed to a high pressure in the second stage and discharged, one of the intermediate-pressure refrigerant sucked into the second-stage suction port is It is characterized in that it is provided with a defrosting path for supplying the part to the evaporator.
【００１７】本発明では、二段目の吸込みポートに吸い
込まれる中間圧冷媒の一部を蒸発器に供給する除霜経路
を備えたため、除霜運転時に、残りの中間圧冷媒を二段
目で圧縮して、その高圧冷媒を高圧側熱交換器に流せ
ば、除霜運転時における高圧側熱交換器の温度低下が少
なくなり、従って、通常運転再開時の定常運転に移行す
るまでの時間を短縮できる。In the present invention, since the defrosting path for supplying a part of the intermediate-pressure refrigerant sucked into the second-stage suction port to the evaporator is provided, the remaining intermediate-pressure refrigerant is second-staged during the defrosting operation. By compressing and flowing the high-pressure refrigerant to the high-pressure side heat exchanger, the temperature drop of the high-pressure side heat exchanger during defrosting operation is reduced, and therefore, the time until transition to steady operation when normal operation is resumed is reduced. Can be shortened.
【００１８】[0018]
【発明の実施の形態】以下、本発明の一実施形態を、図
面に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
【００１９】図１は、二段圧縮型ロータリー式圧縮機を
示す。この圧縮機１はシェルケース１１の内部に電動機
部１２と、この電動機部１２により駆動される圧縮部１
３とを有して構成されている。この圧縮部１３は二段圧
縮の構成を有し、一段目の圧縮部１５と二段目の圧縮部
１７とからなる。FIG. 1 shows a two-stage compression type rotary compressor. The compressor 1 includes an electric motor unit 12 inside a shell case 11, and a compressor unit 1 driven by the electric motor unit 12.
3 and 3. The compression unit 13 has a two-stage compression structure and includes a first-stage compression unit 15 and a second-stage compression unit 17.
【００２０】一段目の圧縮部１５の吸込みポート１５Ａ
から吸い込まれた冷媒は、この圧縮部１５で中間圧Ｐ１
に圧縮された後、第一の吐出ポート１５Ｂから管路１９
を通って二段目の圧縮部１７の吸込みポート１７Ａに直
接導かれる（第一の経路）と共に、第二の吐出ポート１
５Ｃから一旦シェルケース１１内に吐出され、このシェ
ルケース１１内を経た後、管路２１を通って二段目の圧
縮部１７の吸込みポート１７Ａに導かれる（第二の経
路）。Suction port 15A of the first stage compression section 15
The refrigerant sucked from the compression unit 15 receives the intermediate pressure P1.
From the first discharge port 15B to the conduit 19 after being compressed to
Through the suction port 17A of the second-stage compression section 17 (first path) and the second discharge port 1
5C is once discharged into the shell case 11, and after passing through the shell case 11, is guided to the suction port 17A of the second-stage compression section 17 through the pipe line 21 (second path).
【００２１】そして、各経路（管路１９、２１が合流し
た管路２３）を通った中間圧の冷媒は、圧縮部１７で高
圧Ｐ２に圧縮されて吐出される。The intermediate-pressure refrigerant that has passed through each path (the conduit 23 where the conduits 19 and 21 merge) is compressed to a high pressure P2 in the compression unit 17 and is discharged.
【００２２】この二段圧縮型圧縮機１においては、第一
の経路１９、２３を通して二段目の吸込みポート１７Ａ
に導かれた冷媒と、それとは別の第二の経路２１、２３
を通して二段目の吸込みポート１７Ａに導かれた冷媒と
で、潤滑用オイルの混合比率が異なるのが一般的であ
る。第一の経路を経た場合、第二の経路を経た場合に比
べてオイル混合比率が高くなる。In the two-stage compression type compressor 1, the second-stage suction port 17A is passed through the first paths 19 and 23.
And the second paths 21, 23 which are different from that
Generally, the mixing ratio of the lubricating oil is different from that of the refrigerant introduced to the second-stage suction port 17A through. When passing through the first route, the oil mixing ratio becomes higher than when passing through the second route.
【００２３】本実施形態では、第一の経路を構成する管
路１９に、二段目の吸込みポート１７Ａに直接導かれる
冷媒量を調整する調整弁２５が設けられ、この調整弁２
５の弁開度を制御することにより、圧縮機１の二段目の
吐出ポート１７Ｂから吐出される全体のオイル量が調整
される。In this embodiment, the pipe 19 forming the first passage is provided with the adjusting valve 25 for adjusting the amount of the refrigerant directly guided to the second-stage suction port 17A.
By controlling the valve opening of No. 5, the total amount of oil discharged from the second-stage discharge port 17B of the compressor 1 is adjusted.
【００２４】例えば、この調整弁２５の弁開度を絞り気
味にすれば、第一の経路１９、２３を流れる冷媒量が減
って、第二の経路２１、２３を流れる冷媒量が増大す
る。この第二の経路２１、２３を流れる冷媒に対するオ
イル混合比率は、第一の冷媒経路１９、２３を流れる冷
媒のそれよりも小さいため、圧縮機１の二段目の吐出ポ
ート１７Ｂから吐出される全体のオイル量が減少する。For example, if the valve opening of the adjusting valve 25 is reduced, the amount of refrigerant flowing through the first paths 19 and 23 decreases and the amount of refrigerant flowing through the second paths 21 and 23 increases. Since the oil mixing ratio to the refrigerant flowing through the second passages 21 and 23 is smaller than that of the refrigerant flowing through the first refrigerant passages 19 and 23, the oil is discharged from the second-stage discharge port 17B of the compressor 1. The total amount of oil is reduced.
【００２５】これに対し、調整弁２５の弁開度を開き気
味にすれば、第一の経路１９、２３を流れる冷媒量が増
大し、それに伴って、第二の経路２１、２３を流れる冷
媒量が減少する。この場合には、圧縮機１の二段目の吐
出ポート１７Ｂから吐出される全体のオイル量が増大す
る。On the other hand, if the valve opening of the adjusting valve 25 is opened slightly, the amount of the refrigerant flowing through the first paths 19 and 23 increases, and accordingly, the refrigerant flowing through the second paths 21 and 23 increases. The amount decreases. In this case, the total amount of oil discharged from the second-stage discharge port 17B of the compressor 1 increases.
【００２６】上記構成によれば、二段圧縮型圧縮機１か
らの吐出冷媒に対するオイル混合比率を加減することが
可能になる。According to the above construction, the oil mixing ratio to the refrigerant discharged from the two-stage compression type compressor 1 can be adjusted.
【００２７】図２は、上記二段圧縮型圧縮機１を使用し
た冷凍装置を示す。この圧縮機１には、実線で示す冷媒
配管を介して、ガスクーラ（高圧側熱交換器）３、減圧
装置（膨張弁）５、蒸発器（低圧側熱交換器）７が順に
接続されて、冷凍サイクルが構成されている。この冷凍
サイクルにはＣＯ2冷媒が使用される。ＣＯ2冷媒はオゾ
ン破壊係数が０で、地球温暖化係数が１であるため、環
境への負荷が小さく、毒性、可燃性がなく安全で安価で
ある。FIG. 2 shows a refrigerating apparatus using the two-stage compression type compressor 1. A gas cooler (high pressure side heat exchanger) 3, a pressure reducing device (expansion valve) 5, and an evaporator (low pressure side heat exchanger) 7 are sequentially connected to the compressor 1 through a refrigerant pipe shown by a solid line, A refrigeration cycle is configured. A CO 2 refrigerant is used in this refrigeration cycle. Since the CO 2 refrigerant has an ozone depletion potential of 0 and a global warming potential of 1, it has a low environmental load, is neither toxic nor flammable, and is safe and inexpensive.
【００２８】上記ガスクーラ３は、ＣＯ2冷媒が流れる
冷媒コイル９と、水が流れる水コイル１０とからなり、
この水コイル１０は水配管を介して図示を省略した貯湯
タンクに接続されている。水配管には図示を省略した循
環ポンプが接続され、この循環ポンプが駆動されて貯湯
タンクの水がガスクーラ３を循環し、ここで加熱されて
貯湯タンクに貯湯される。The gas cooler 3 comprises a refrigerant coil 9 in which a CO 2 refrigerant flows and a water coil 10 in which water flows,
The water coil 10 is connected to a hot water storage tank (not shown) via a water pipe. A circulation pump (not shown) is connected to the water pipe, and the circulation pump is driven to circulate the water in the hot water storage tank through the gas cooler 3, where it is heated and stored in the hot water storage tank.
【００２９】この冷凍装置は、冷凍機ユニットとして屋
外に設置されており、蒸発器７に付着した霜を除去する
ための除霜運転が必要になる。この場合の除霜運転は、
圧縮機１から吐出された高圧Ｐ２の冷媒を、ガスクーラ
３および膨張弁５をバイパスするバイパス管３３を通じ
て蒸発器７に供給し、これを加熱することにより行われ
る（除霜経路）。この除霜運転では、バイパス管３３に
設けられた通常時閉の除霜用電磁弁３５が開かれる。This refrigerating apparatus is installed outdoors as a refrigerator unit and requires a defrosting operation for removing the frost adhering to the evaporator 7. The defrosting operation in this case is
The high-pressure P2 refrigerant discharged from the compressor 1 is supplied to the evaporator 7 through a bypass pipe 33 that bypasses the gas cooler 3 and the expansion valve 5 and is heated (defrost path). In this defrosting operation, the normally closed defrosting electromagnetic valve 35 provided in the bypass pipe 33 is opened.
【００３０】通常、ホットガス除霜が行われる場合、圧
縮機１から吐出された高圧ガスを低圧側蒸発器７に直接
供給することになるため、高低圧差の減少によって圧縮
機１のオイル吐出量が増大する。これが増大すると、オ
イル不足状態となって、通常運転再開時の圧縮機性能が
低下する。Normally, when hot gas defrosting is performed, the high-pressure gas discharged from the compressor 1 is directly supplied to the low-pressure side evaporator 7, so that the oil discharge amount of the compressor 1 is reduced by reducing the high-low pressure difference. Will increase. If this increases, an oil shortage occurs and the compressor performance at the time of restarting normal operation deteriorates.
【００３１】本実施形態では、オイル吐出量の増大を抑
制するために、除霜運転時に管路１９に設けた調整弁２
５が閉じられる。In this embodiment, in order to suppress an increase in the oil discharge amount, the adjusting valve 2 provided in the pipe line 19 during the defrosting operation.
5 is closed.
【００３２】この調整弁２５が完全に閉じられた場合、
冷媒は、第一の経路１９、２３を流れなくなり、すべて
の冷媒がシェルケース１１内を経て、第二の経路２１、
２３を流れる。第二の経路２１、２３を流れる冷媒のオ
イル混合比率は、第一の冷媒経路１９、２３を流れる冷
媒のそれよりも小さいため、二段目の吐出ポート１７Ｂ
から吐出される全体のオイル量が減少する。When the adjusting valve 25 is completely closed,
The refrigerant stops flowing through the first paths 19 and 23, all the refrigerant passes through the shell case 11, and the second path 21 and
Flow through 23. Since the oil mixing ratio of the refrigerant flowing through the second passages 21 and 23 is smaller than that of the refrigerant flowing through the first refrigerant passages 19 and 23, the second-stage discharge port 17B
The total amount of oil discharged from the tank is reduced.
【００３３】従って、除霜運転時にオイル不足状態とな
ることが少なく、通常運転再開時の圧縮機性能の維持が
図られる。Therefore, an oil shortage is less likely to occur during the defrosting operation, and the compressor performance can be maintained when the normal operation is resumed.
【００３４】図３は、冷凍装置の別の実施形態を示す。FIG. 3 shows another embodiment of the refrigeration system.
【００３５】この実施形態では、二段目の吸込みポート
１７Ａに吸い込まれる中間圧Ｐ１の冷媒の一部を蒸発器
７に供給するバイパス管３７が設けられ（除霜経路）、
このバイパス管３５には除霜用電磁弁３９が設けられ
る。In this embodiment, a bypass pipe 37 for supplying a part of the intermediate pressure P1 refrigerant sucked into the second-stage suction port 17A to the evaporator 7 is provided (defrosting path),
The bypass pipe 35 is provided with a defrosting electromagnetic valve 39.
【００３６】そして、ホットガス除霜運転時には、この
除霜用電磁弁３９が開かれ、二段目の吸込みポート１７
Ａに吸い込まれる中間圧Ｐ１冷媒の一部が、蒸発器７に
直接供給されると共に、残りの中間圧Ｐ１冷媒は二段目
で圧縮されて、その高圧Ｐ２冷媒がガスクーラ３に流さ
れる。During the hot gas defrosting operation, the defrosting solenoid valve 39 is opened and the second-stage suction port 17 is opened.
A part of the intermediate pressure P1 refrigerant sucked into A is directly supplied to the evaporator 7, the remaining intermediate pressure P1 refrigerant is compressed in the second stage, and the high pressure P2 refrigerant is flown to the gas cooler 3.
【００３７】本実施形態では、図２に示すものと比較し
た場合、ガスクーラ３への経路とホットガス除霜経路と
が別々に形成されるため、除霜運転しながら高圧Ｐ２冷
媒をガスクーラ３に導くことができるため、除霜運転時
におけるガスクーラ３の温度低下が少なくなり、従っ
て、通常運転再開時の定常運転に移行するまでの時間を
短縮することができる。In this embodiment, when compared with the one shown in FIG. 2, the path to the gas cooler 3 and the hot gas defrosting path are formed separately, so that the high pressure P2 refrigerant is supplied to the gas cooler 3 while performing the defrosting operation. Since it can be guided, the temperature decrease of the gas cooler 3 during the defrosting operation is reduced, and therefore, the time until the steady operation is resumed when the normal operation is resumed can be shortened.
【００３８】以上、一実施形態に基づいて本発明を説明
したが、本発明はこれに限定されるものでないことは明
らかである。Although the present invention has been described based on the embodiment, it is obvious that the present invention is not limited to this.
【００３９】例えば、調整弁２５は弁開度がリニアに開
閉制御される電動弁であってもよいし、オン・オフ制御
弁であってもよい。For example, the regulating valve 25 may be an electrically operated valve whose valve opening is controlled to open and close linearly, or may be an on / off control valve.
【００４０】[0040]
【発明の効果】本発明では、第一の経路に二段目の吸込
みポートに直接導かれる冷媒量を調整する調整弁を設け
たため、この調整弁の調整によって、二段目から吐出さ
れるオイル量を調整することができる。According to the present invention, since the adjusting valve for adjusting the amount of the refrigerant directly introduced to the suction port of the second stage is provided in the first passage, the oil discharged from the second stage is adjusted by adjusting the adjusting valve. The amount can be adjusted.
【００４１】本発明では、二段目の吸込みポートに吸い
込まれる中間圧冷媒の一部を蒸発器に供給する除霜経路
を備えたため、除霜運転時に残りの中間圧冷媒を二段目
で圧縮して、その高圧冷媒を高圧側熱交換器に流せば除
霜運転時における高圧側熱交換器の温度低下が少なくな
り、従って、通常運転再開時の定常運転に移行するまで
の時間を短縮することができる。In the present invention, since the defrosting path for supplying a part of the intermediate pressure refrigerant sucked into the second-stage suction port to the evaporator is provided, the remaining intermediate-pressure refrigerant is compressed in the second stage during the defrosting operation. Then, by flowing the high-pressure refrigerant to the high-pressure side heat exchanger, the temperature drop of the high-pressure side heat exchanger during the defrosting operation is reduced, and therefore the time until the transition to the steady operation at the time of restarting the normal operation is shortened. be able to.
【図１】本発明による二段圧縮型圧縮機の一実施形態を
示す図である。FIG. 1 is a diagram showing an embodiment of a two-stage compression type compressor according to the present invention.
【図２】二段圧縮型圧縮機を用いた冷凍装置の一実施形
態を示す回路図である。FIG. 2 is a circuit diagram showing an embodiment of a refrigerating apparatus using a two-stage compression type compressor.
【図３】二段圧縮型圧縮機を用いた冷凍装置の別の実施
形態を示す回路図である。FIG. 3 is a circuit diagram showing another embodiment of a refrigerating apparatus using a two-stage compression type compressor.
１ 圧縮機 ３ ガスクーラ ５ 減圧装置 ７ 蒸発器 ９ 冷媒コイル １０ 水コイル １１ シェルケース １３ 圧縮部 １５ 一段目の圧縮部 １５Ａ 吸込みポート １７ 二段目の圧縮部 １７Ａ 吸込みポート １９ 管路 Ｐ１ 中間圧 Ｐ２ 高圧 1 compressor 3 gas cooler 5 decompression device 7 evaporator 9 Refrigerant coil 10 water coils 11 shell case 13 Compressor 15 First stage compression unit 15A suction port 17 Second stage compression unit 17A suction port 19 pipelines P1 intermediate pressure P2 high pressure
───────────────────────────────────────────────────── フロントページの続き (72)発明者 向山 洋 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 小田 淳志 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 Ｆターム(参考） 3H029 AA04 AA09 AA13 AB03 BB04 BB06 CC02 CC08 CC14 CC24 CC25 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiroshi Mukaiyama 2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture Within Yo Denki Co., Ltd. (72) Inventor Atsushi Oda 2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture Within Yo Denki Co., Ltd. F-term (reference) 3H029 AA04 AA09 AA13 AB03 BB04 BB06 CC02 CC08 CC14 CC24 CC25
Claims (4)
目の吸込みポートに直接導く第一の経路と、一段目で中
間圧に圧縮された冷媒をシェルケース内に吐出し、この
シェルケース内を通して二段目の吸込みポートに導く第
二の経路とを有し、各経路を通して二段目の吸込みポー
トに導かれた中間圧の冷媒を、この二段目で高圧に圧縮
して吐出する構成を有した二段圧縮型圧縮機において、 上記第一の経路に二段目の吸込みポートに直接導かれる
冷媒量を調整する調整弁を設けたことを特徴とする二段
圧縮型圧縮機。1. A first path for directly guiding a refrigerant compressed to an intermediate pressure in the first stage to a suction port of a second step, and a refrigerant compressed to an intermediate pressure in the first stage are discharged into a shell case, There is a second path that leads to the second-stage suction port through the shell case, and the intermediate-pressure refrigerant that is guided to the second-stage suction port through each path is compressed to high pressure in the second-stage. A two-stage compression type compressor having a discharge structure, characterized in that an adjusting valve for adjusting the amount of refrigerant directly introduced to the second-stage suction port is provided in the first path. Machine.
間圧に圧縮された冷媒を二段目の吸込みポートに直接導
く第一の経路と、一段目で中間圧に圧縮された冷媒をシ
ェルケース内に吐出し、このシェルケース内を通して二
段目の吸込みポートに導く第二の経路とを有し、各経路
を通して二段目の吸込みポートに導かれた中間圧の冷媒
を、この二段目で高圧に圧縮して吐出する構成を有した
二段圧縮型圧縮機を備えた冷凍装置において、 上記第一の経路に二段目の吸込みポートに直接導かれる
冷媒量を調整する調整弁を設けたことを特徴とする冷凍
装置。2. A two-stage compression type compressor, wherein a first path directly guides a refrigerant compressed to an intermediate pressure in the first stage to a suction port in the second stage and an intermediate pressure in the first stage. The refrigerant is discharged into the shell case, and has a second path leading to the second-stage suction port through the shell case, the intermediate-pressure refrigerant guided to the second-stage suction port through each path, In the refrigerating apparatus including the two-stage compression type compressor having a configuration of compressing and discharging to high pressure in the second stage, the amount of refrigerant directly guided to the second stage suction port in the first path is adjusted. A refrigeration system provided with a regulating valve.
冷媒を蒸発器に供給する除霜経路を有し、この除霜経路
を通じた除霜運転時に上記調整弁を閉じる手段を備えた
ことを特徴とする請求項２記載の冷凍装置。3. A defrosting path for supplying the evaporator with high-pressure refrigerant discharged from the second-stage discharge port, and means for closing the adjusting valve at the time of defrosting operation through the defrosting path. The refrigeration apparatus according to claim 2, wherein
間圧に圧縮された冷媒を二段目の吸込みポートに直接導
く第一の経路と、一段目で中間圧に圧縮された冷媒をシ
ェルケース内に吐出し、このシェルケース内を通して二
段目の吸込みポートに導く第二の経路とを有し、各経路
を通して二段目の吸込みポートに導かれた中間圧の冷媒
を、この二段目で高圧に圧縮して吐出する構成を有した
二段圧縮型圧縮機を備えた冷凍装置において、 上記二段目の吸込みポートに吸い込まれる中間圧冷媒の
一部を蒸発器に供給する除霜経路を備えたことを特徴と
する冷凍装置。4. A two-stage compression type compressor, wherein a first passage directly guides a refrigerant compressed to an intermediate pressure in the first stage to a suction port in the second stage and an intermediate pressure in the first stage. The refrigerant is discharged into the shell case, and has a second path leading to the second-stage suction port through the shell case, the intermediate-pressure refrigerant guided to the second-stage suction port through each path, In the refrigerating apparatus including the two-stage compression type compressor configured to discharge to the high pressure in the second stage, a part of the intermediate pressure refrigerant sucked into the second-stage suction port is supplied to the evaporator. A refrigeration system having a defrosting path for
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| JP2001199103A JP3594570B2 (en) | 2001-06-29 | 2001-06-29 | Two-stage compression type compressor and refrigeration system using the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001199103A JP3594570B2 (en) | 2001-06-29 | 2001-06-29 | Two-stage compression type compressor and refrigeration system using the same |
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| Publication Number | Publication Date |
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| JP3594570B2 JP3594570B2 (en) | 2004-12-02 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100585809B1 (en) | 2004-12-28 | 2006-06-07 | 엘지전자 주식회사 | Variable capacity multiple rotary compressors and their operation methods |
| JP2006161659A (en) * | 2004-12-07 | 2006-06-22 | Hitachi Ltd | Refrigeration cycle equipment |
| CN100419403C (en) * | 2005-07-20 | 2008-09-17 | 中国计量学院 | Equivalent test method for compressor cooling capacity with the same compression ratio and flow requirements as the national standard |
| WO2009084245A1 (en) * | 2007-12-27 | 2009-07-09 | Mitsubishi Electric Corporation | Electric motor for compressor, compressor, and freezing cycle device |
| US20110030409A1 (en) * | 2008-04-22 | 2011-02-10 | Daikin Industries, Ltd. | Refrigeration apparatus |
| KR102798080B1 (en) * | 2024-06-24 | 2025-04-17 | 아르네코리아(주) | A chiller system using corbon dioxide gas for the industrial use |
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2001
- 2001-06-29 JP JP2001199103A patent/JP3594570B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006161659A (en) * | 2004-12-07 | 2006-06-22 | Hitachi Ltd | Refrigeration cycle equipment |
| KR100585809B1 (en) | 2004-12-28 | 2006-06-07 | 엘지전자 주식회사 | Variable capacity multiple rotary compressors and their operation methods |
| CN100419403C (en) * | 2005-07-20 | 2008-09-17 | 中国计量学院 | Equivalent test method for compressor cooling capacity with the same compression ratio and flow requirements as the national standard |
| WO2009084245A1 (en) * | 2007-12-27 | 2009-07-09 | Mitsubishi Electric Corporation | Electric motor for compressor, compressor, and freezing cycle device |
| JPWO2009084245A1 (en) * | 2007-12-27 | 2011-05-12 | 三菱電機株式会社 | Electric motor for compressor, compressor and refrigeration cycle apparatus |
| US20110030409A1 (en) * | 2008-04-22 | 2011-02-10 | Daikin Industries, Ltd. | Refrigeration apparatus |
| KR102798080B1 (en) * | 2024-06-24 | 2025-04-17 | 아르네코리아(주) | A chiller system using corbon dioxide gas for the industrial use |
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| Publication number | Publication date |
|---|---|
| JP3594570B2 (en) | 2004-12-02 |
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