JP2018004220A - Refrigerator - Google Patents

Refrigerator Download PDF

Info

Publication number
JP2018004220A
JP2018004220A JP2016135069A JP2016135069A JP2018004220A JP 2018004220 A JP2018004220 A JP 2018004220A JP 2016135069 A JP2016135069 A JP 2016135069A JP 2016135069 A JP2016135069 A JP 2016135069A JP 2018004220 A JP2018004220 A JP 2018004220A
Authority
JP
Japan
Prior art keywords
oil
compressor
refrigerant
internal mechanism
return
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
Application number
JP2016135069A
Other languages
Japanese (ja)
Other versions
JP6758963B2 (en
Inventor
善彰 宮本
Yoshiaki Miyamoto
善彰 宮本
創 佐藤
So Sato
創 佐藤
和巳 長田
Kazumi Osada
和巳 長田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Priority to JP2016135069A priority Critical patent/JP6758963B2/en
Publication of JP2018004220A publication Critical patent/JP2018004220A/en
Application granted granted Critical
Publication of JP6758963B2 publication Critical patent/JP6758963B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve a lubrication condition of a compressor by using return oil from oil separators and prevent liquid compression in starting of the compressor.SOLUTION: A refrigerator 1 includes: a compressor 2 which compresses a refrigerant; a plurality of oil separators 8 and 9 which are connected in series to a refrigerant circuit 7 extended from a discharge side of the compressor 2 and separates/recovers refrigeration oil contained in the refrigerant discharged from the compressor 2; and a plurality of oil return pipelines 16 and 17 extended from the plurality of oil separators 8 and 9. One of the plurality of oil return pipelines 16 and 17 is connected to a suction side of the compressor 2, and the other of the plurality of oil return pipelines 16 and 17 is connected to an internal mechanism section of the compressor 2. The internal mechanism section serves as a bearing section 26, for instance.SELECTED DRAWING: Figure 1

Description

本発明は、油分離器を備えた冷凍装置に関するものである。   The present invention relates to a refrigeration apparatus including an oil separator.

冷媒を圧縮する圧縮機（コンプレッサ）に用いられる冷凍機油は、圧縮機から吐出される圧縮冷媒ガス中に混入して冷凍回路中を循環する。この冷凍機油が凝縮器や蒸発器等の熱交換器に入ると熱伝導が阻害されるため、特許文献１等に開示されているように、圧縮機から吐出された圧縮冷媒は油分離器（オイルセパレータ）に通されて冷凍機油を分離される。分離された冷凍機油はキャピラリチューブ等の減圧部により減圧されて圧縮機の吸入側に戻される。   Refrigerating machine oil used in a compressor (compressor) that compresses refrigerant is mixed in compressed refrigerant gas discharged from the compressor and circulates in the refrigeration circuit. When this refrigerating machine oil enters a heat exchanger such as a condenser or an evaporator, the heat conduction is hindered. Therefore, as disclosed in Patent Document 1 and the like, the compressed refrigerant discharged from the compressor is an oil separator ( The oil is passed through an oil separator to separate the refrigerating machine oil. The separated refrigeration oil is decompressed by a decompression unit such as a capillary tube and returned to the suction side of the compressor.

油分離器は、その容量が大きいほど油分離性能を高められるが、冷蔵車等の車両に搭載されている冷凍装置においては、車両内部スペースの関係で十分なサイズの油分離器を設置できず、例えば小型の油分離器を２箇所に分散させて配置し、これらの油分離器を直列に接続することで必要な油分離性能を確保している。２つの油分離器の底部から延びる油戻し管路は、それぞれキャピラリチューブを介して圧縮機の吸入側に接続される。キャピラリチューブを用いることで、電磁弁等の部材を省き、油戻し管路の構成を簡素化することができる。   The larger the capacity of the oil separator, the higher the oil separation performance. However, in a refrigeration system mounted on a vehicle such as a refrigerated vehicle, an oil separator of sufficient size cannot be installed due to the space inside the vehicle. For example, small oil separators are dispersed in two locations and these oil separators are connected in series to ensure necessary oil separation performance. The oil return lines extending from the bottoms of the two oil separators are each connected to the suction side of the compressor via a capillary tube. By using a capillary tube, members such as an electromagnetic valve can be omitted, and the configuration of the oil return conduit can be simplified.

特開２００７−１４７２１２号公報JP 2007-147212 A

上記のように、油分離器からの油戻し管路に電磁弁等を設けずにキャピラリチューブを経て圧縮機の吸入側のみに接続すると、冷凍装置の停止時に油分離器からの戻り油の大部分がキャピラリチューブを通過して圧縮機の内部に溜まり込み、圧縮機の起動時に戻り油が液圧縮されて圧縮機が破損する虞がある。
これを防止するべく、従来では冷凍装置の停止時に油分離器からの戻り油が圧縮機の上流側にあるアキュムレータの方に溜まるように、圧縮機とアキュムレータとの間に高低差を設けて対処していたが、これによりアキュムレータの配置位置に制約が加わってしまう。 As described above, if the oil return line from the oil separator is not provided with a solenoid valve or the like and is connected only to the suction side of the compressor via a capillary tube, a large amount of return oil from the oil separator when the refrigeration system is stopped. There is a possibility that the portion passes through the capillary tube and accumulates in the compressor, and the return oil is liquid-compressed when the compressor is started, and the compressor is damaged.
In order to prevent this, conventionally, there is a difference in level between the compressor and the accumulator so that the return oil from the oil separator is accumulated in the accumulator on the upstream side of the compressor when the refrigeration system is stopped. However, this places a restriction on the position of the accumulator.

一方、自動車等の車両における冷凍装置においては、設置スペースの関係で圧縮機を小型化する必要があり、圧縮機の内部に油ポンプや油貯留部が設けられていない。このため、圧縮機の内部機構の潤滑は、冷媒中に含まれる冷凍機油の霧によるミスト潤滑となっている。
しかしながら、圧縮機がエンジン等の外部動力によって駆動される開放型である場合には、その主軸が圧縮機ハウジングから外部に突出する部分に設けられる軸受部材や軸シール部材がミスト潤滑のみでは十分に潤滑されない虞があった。 On the other hand, in a refrigeration apparatus in a vehicle such as an automobile, it is necessary to reduce the size of the compressor due to the installation space, and an oil pump and an oil reservoir are not provided inside the compressor. For this reason, lubrication of the internal mechanism of the compressor is mist lubrication due to mist of refrigerating machine oil contained in the refrigerant.
However, when the compressor is an open type driven by external power from an engine or the like, it is sufficient that the bearing member and the shaft seal member provided at the portion where the main shaft protrudes outside from the compressor housing are mist lubrication alone. There was a risk of not being lubricated.

本発明は、このような課題を解決するためになされたものであり、油分離器からの戻り油を利用して圧縮機の潤滑条件を改善するとともに、圧縮機の起動時における液圧縮を防止することができる冷凍装置を提供することを目的とする。   The present invention has been made to solve such a problem, and improves the lubrication conditions of the compressor by using the return oil from the oil separator and prevents liquid compression at the time of starting the compressor. It is an object of the present invention to provide a refrigeration apparatus that can be used.

本発明に係る冷凍装置は、冷媒を圧縮する圧縮機と、前記圧縮機の吐出側から延出する冷媒回路に直列に接続され、前記圧縮機から吐出される前記冷媒中に含まれる冷凍機油を分離・回収する複数の油分離器と、複数の前記油分離器から延出する複数の油戻し管路と、を備え、複数の前記油戻し管路の１本は前記圧縮機の吸入側に接続され、複数の前記油戻し管路の別な１本は前記圧縮機の内部機構部に接続されたものである。   A refrigerating apparatus according to the present invention is connected in series to a compressor that compresses a refrigerant and a refrigerant circuit extending from a discharge side of the compressor, and refrigerating machine oil contained in the refrigerant discharged from the compressor. A plurality of oil separators to be separated and recovered, and a plurality of oil return pipes extending from the plurality of oil separators, one of the plurality of oil return pipes being provided on the suction side of the compressor Another one of the plurality of oil return pipes connected is connected to an internal mechanism of the compressor.

上記構成の冷凍装置によれば、複数の油分離器によって吐出冷媒から冷凍機油が分離・回収され、この回収された冷凍機油が、各油分離器から延出する複数の油戻し管路を経て圧縮機の吸入側と、圧縮機の内部機構部とに戻される。このため、戻り油によって圧縮機の内部機構部が強制的に潤滑される。つまり、戻り油を有効に利用して、従来のミスト潤滑のみによる潤滑に比べて圧縮機の潤滑条件を改善することができる。   According to the refrigeration apparatus having the above configuration, the refrigeration oil is separated and recovered from the refrigerant discharged by the plurality of oil separators, and the recovered refrigeration oil passes through the plurality of oil return pipes extending from each oil separator. It is returned to the suction side of the compressor and the internal mechanism part of the compressor. For this reason, the internal mechanism of the compressor is forcibly lubricated by the return oil. In other words, the return oil can be used effectively to improve the lubrication conditions of the compressor as compared with the conventional lubrication using only mist lubrication.

また、上記のように冷凍機油の戻り先が圧縮機の吸入側と内部機構部とに分散されるため、冷凍装置の停止時に戻り油の全量が圧縮機の吸入側に集中することがない。したがって、圧縮機の起動時における液圧縮を防止することができる。また、従来のように戻り油がアキュムレータに戻るよう圧縮機とアキュムレータとの間に高低差を設ける必要性が低下し、アキュムレータの配置位置の自由度が高められる。   Moreover, since the return destination of the refrigerating machine oil is dispersed between the suction side of the compressor and the internal mechanism as described above, the entire amount of return oil does not concentrate on the suction side of the compressor when the refrigeration apparatus is stopped. Therefore, liquid compression at the time of starting of the compressor can be prevented. Further, the necessity of providing a height difference between the compressor and the accumulator so that the return oil returns to the accumulator as in the conventional case is reduced, and the degree of freedom of the arrangement position of the accumulator is increased.

上記構成の冷凍装置において、前記圧縮機は、前記内部機構部が前記冷凍機油のミストによって潤滑される開放型圧縮機であり、前記内部機構部に接続される前記油戻し管路は、前記内部機構部のうちの軸受部における軸受部材または軸シール部材の少なくとも一方に接続されるようにしてもよい。   In the refrigeration apparatus having the above-described configuration, the compressor is an open-type compressor in which the internal mechanism is lubricated by mist of the refrigerator oil, and the oil return pipe connected to the internal mechanism is the internal You may make it connect with at least one of the bearing member in the bearing part of a mechanism part, or a shaft seal member.

開放型の圧縮機においては、軸受部に設けられる軸受部材や軸シール部材がミスト潤滑のみでは十分に潤滑されない虞があったが、この軸受部における軸受部材や軸シール部材に油戻し管路から戻り油が供給されるため、ミスト潤滑による潤滑が困難な軸受部を強制的に潤滑して潤滑条件を改善することができる。   In the open type compressor, there is a possibility that the bearing member and the shaft seal member provided in the bearing portion may not be sufficiently lubricated only by mist lubrication. Since the return oil is supplied, the lubrication conditions can be improved by forcibly lubricating the bearing portion that is difficult to lubricate by mist lubrication.

上記構成の冷凍装置において、前記内部機構部に接続される前記油戻し管路は、前記複数の油分離器のうち、最も上流側のものから延出するものとするのが好ましい。   In the refrigeration apparatus having the above-described configuration, it is preferable that the oil return pipe connected to the internal mechanism portion extends from the most upstream one of the plurality of oil separators.

上流側の油分離器には下流側の油分離器よりも多くの冷凍機油が回収される。このため、上流側の油分離器から延出する油戻し管路を圧縮機の内部機構部に接続することにより、内部機構部への給油量を多くして潤滑条件を確実に向上させることができる。
また、冷凍機油の回収量が少ない下流側の油分離器から延出する油戻し管路が圧縮機の吸入側に接続されるので、冷凍装置の停止時に圧縮機の吸入側に戻る冷凍機油の量を減少させ、圧縮機の起動時における液圧縮を防止することができる。 More oil in the refrigeration machine is recovered in the upstream oil separator than in the downstream oil separator. For this reason, by connecting the oil return line extending from the upstream oil separator to the internal mechanism part of the compressor, the amount of oil supplied to the internal mechanism part can be increased and the lubrication conditions can be improved reliably. it can.
In addition, since the oil return line extending from the downstream oil separator that collects a small amount of refrigeration oil is connected to the suction side of the compressor, the refrigerating machine oil that returns to the suction side of the compressor when the refrigeration system is stopped The amount can be reduced and liquid compression at the start of the compressor can be prevented.

上記構成の冷凍装置において、前記内部機構部に接続される前記油戻し管路に開閉弁を設けてもよい。こうすれば、開閉弁を開閉操作することにより、圧縮機の内部機構部に供給される戻り油の量を必要に応じて制御することができる。
例えば、冷凍装置の中〜高負荷運転時には、圧縮機を通過する冷媒量が多くなることから冷媒中に含まれる冷凍機油の霧によるミスト潤滑が良好になる。このため、開閉弁を閉じるか開度を小さくして内部機構部への戻り油の供給を停止させるか供給量を少なくし、冷凍装置の系統内に冷凍機油が過剰に供給されることを抑制することができる。 In the refrigeration apparatus having the above-described configuration, an opening / closing valve may be provided in the oil return pipe connected to the internal mechanism. In this way, the amount of return oil supplied to the internal mechanism of the compressor can be controlled as necessary by opening and closing the on-off valve.
For example, during medium to high load operation of the refrigeration apparatus, the amount of refrigerant passing through the compressor increases, so that mist lubrication by mist of refrigerating machine oil contained in the refrigerant is improved. For this reason, close the on-off valve or reduce the opening to stop the supply of return oil to the internal mechanism or reduce the supply amount to suppress excessive supply of refrigeration oil in the refrigeration system. can do.

また、冷凍装置の低負荷運転時や、蒸発器温度および冷媒圧力（即ち吸入冷媒の密度）がより低下する冷凍運転時には、圧縮機を通過する冷媒量が減少し、冷媒中に含まれる冷凍機油の霧によるミスト潤滑のみでは圧縮機の内部機構部の潤滑が不足する可能性がある。このような場合には開閉弁を開き、内部機構部に戻り油を供給することによって内部機構部を強制的に潤滑し、その潤滑条件を改善することができる。
さらに、冷凍装置の停止時には、開閉弁を閉じておくことにより、油分離器に回収された冷凍機油が高低差圧により油戻し管路を流下して圧縮機に溜まることを防止できる。これにより、圧縮機の起動時における液圧縮を回避することができる。 In addition, during the low load operation of the refrigeration apparatus or during the refrigeration operation in which the evaporator temperature and the refrigerant pressure (that is, the density of the intake refrigerant) are further reduced, the amount of refrigerant passing through the compressor decreases, and the refrigeration oil contained in the refrigerant There is a possibility that the internal mechanism part of the compressor is insufficiently lubricated only by the mist lubrication by the fog. In such a case, the internal mechanism can be forcibly lubricated by opening the on-off valve and supplying the return oil to the internal mechanism to improve the lubrication conditions.
Furthermore, when the refrigerating apparatus is stopped, the on-off valve is closed, so that the refrigerating machine oil recovered in the oil separator can be prevented from flowing down the oil return line due to high and low differential pressures and collecting in the compressor. Thereby, the liquid compression at the time of starting of a compressor can be avoided.

以上のように、本発明に係る冷凍装置によれば、油分離器からの戻り油を利用して圧縮機の潤滑条件を改善するとともに、圧縮機の起動時における液圧縮を防止することができる。   As described above, according to the refrigeration apparatus according to the present invention, the return oil from the oil separator can be used to improve the lubrication conditions of the compressor and to prevent liquid compression at the time of starting the compressor. .

本発明の第１実施形態を示す冷凍装置の概略構成図である。It is a schematic block diagram of the freezing apparatus which shows 1st Embodiment of this invention. 図１のII部を拡大した圧縮機の縦断面図である。It is the longitudinal cross-sectional view of the compressor which expanded the II section of FIG. 本発明の第２実施形態を示す冷凍装置の概略構成図である。It is a schematic block diagram of the freezing apparatus which shows 2nd Embodiment of this invention.

以下、本発明の実施形態について図面を参照しながら説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

［第１実施形態］
図１は、本発明の第１実施形態を示す冷凍装置の概略構成図である。この冷凍装置１は、例えば冷蔵輸送車における冷蔵室の冷却に用いられる冷却専用の回路であるが、自動車の空調装置等にも応用することができる。 [First Embodiment]
FIG. 1 is a schematic configuration diagram of a refrigeration apparatus showing a first embodiment of the present invention. The refrigeration apparatus 1 is a circuit dedicated to cooling used for cooling a refrigerated room in a refrigerated transport vehicle, for example, but can also be applied to an air conditioner for an automobile.

冷凍装置１は、車両のエンジン等に駆動されて冷媒を圧縮する開放型（主軸が外部に突出した形式）の圧縮機２を備えている。圧縮機２は、例えばスクロール式のものであり、ベルト等で回転駆動されるクラッチ付プーリー３と、吸入ポート４と、吐出ポート５とを備えている。冷凍装置１は、圧縮機２の吐出ポート５から延びて吸入ポート４に戻る閉ループ状の冷媒回路７を備えており、その上流側（圧縮機２側）から順に、油分離器８、油分離器９、凝縮器１０、レシーバ１１、膨張弁１２、蒸発器１３、アキュムレータ１４が接続されている。つまり、２つの油分離器８，９は、圧縮機２の吐出側から延出する冷媒回路７に直列に接続されている。これらの油分離器８，９は、車両搭載スペースの関係で２つに分けられたものである。なお、凝縮器１０には冷却ファン１０ａが設けられ、蒸発器１３には送風ファン１３ａが設けられている。   The refrigeration apparatus 1 includes an open type compressor (a type in which a main shaft protrudes outside) that is driven by a vehicle engine or the like to compress refrigerant. The compressor 2 is of a scroll type, for example, and includes a pulley 3 with a clutch that is rotationally driven by a belt or the like, a suction port 4, and a discharge port 5. The refrigeration apparatus 1 includes a closed-loop refrigerant circuit 7 that extends from the discharge port 5 of the compressor 2 and returns to the suction port 4, and in that order from the upstream side (compressor 2 side), an oil separator 8 and an oil separator. A vessel 9, a condenser 10, a receiver 11, an expansion valve 12, an evaporator 13, and an accumulator 14 are connected. That is, the two oil separators 8 and 9 are connected in series to the refrigerant circuit 7 extending from the discharge side of the compressor 2. These oil separators 8 and 9 are divided into two due to the vehicle mounting space. The condenser 10 is provided with a cooling fan 10a, and the evaporator 13 is provided with a blower fan 13a.

上流側の油分離器８の底部からは油戻し管路１６が延出し、その先端が圧縮機２の内部機構部（例えば軸受部２６）に接続されている。また、下流側の油分離器９の底部からは油戻し管路１７が延出して圧縮機２の吸入側、例えば冷媒回路７における吸入ポート４とアキュムレータ１４との間の区間に接続されている。
油戻し管路１６にはキャピラリチューブ１９と電磁弁２０（開閉弁）とが接続され、油戻し管路１７にはキャピラリチューブ２１が接続されている。上に述べた各部材７〜２１は、全て公知のものである。なお、電磁弁２０は必須ではないが、電磁弁２０を設けることにより、後述するように油戻し管路１６から圧縮機２への戻り油の供給量を制御することができる。 An oil return line 16 extends from the bottom of the upstream oil separator 8, and its tip is connected to an internal mechanism part (for example, a bearing part 26) of the compressor 2. An oil return line 17 extends from the bottom of the oil separator 9 on the downstream side and is connected to the suction side of the compressor 2, for example, a section between the suction port 4 and the accumulator 14 in the refrigerant circuit 7. .
A capillary tube 19 and an electromagnetic valve 20 (open / close valve) are connected to the oil return line 16, and a capillary tube 21 is connected to the oil return line 17. Each member 7-21 mentioned above is a well-known thing. Although the solenoid valve 20 is not essential, the supply amount of return oil from the oil return line 16 to the compressor 2 can be controlled by providing the solenoid valve 20 as described later.

図２は、図１のII部を拡大した圧縮機２の縦断面図である。圧縮機２は、軽合金製のハウジング２５を備えており、その内部に設けられた軸受部２６に主軸２７が軸支されている。主軸２７はハウジング２５の内部から外部に貫通しており、その外端部に前述のクラッチ付プーリー３が装着されている。軸受部２６は、内側のメイン軸受２６ａ（軸受部材）と、外側のサブ軸受２６ｂ（軸受部材）と、さらにその外側のリップシール２６ｃ（軸シール部材）とを有する構成である。   FIG. 2 is a longitudinal sectional view of the compressor 2 in which the II part of FIG. 1 is enlarged. The compressor 2 includes a light alloy housing 25, and a main shaft 27 is pivotally supported by a bearing portion 26 provided therein. The main shaft 27 penetrates from the inside of the housing 25 to the outside, and the above-described pulley 3 with a clutch is attached to the outer end portion thereof. The bearing portion 26 includes an inner main bearing 26a (bearing member), an outer sub-bearing 26b (bearing member), and an outer lip seal 26c (shaft seal member).

クラッチ付プーリー３がエンジン等の外部動力によって回転駆動され、その内部の電磁クラッチ３ａがＯＮになると、クラッチ付プーリー３の回転が主軸２７に伝達され、主軸２７の内端部に偏心形成されたクランクピン２７ａがドライブブッシュ２８とドライブ軸受２９とを介して圧縮機構３０の旋回スクロール３１を図示しない固定スクロールに対して旋回公転運動させる。これにより、吸入ポート４から吸入された冷媒が圧縮され、図１に示す吐出ポート５から吐出される。   When the clutch-equipped pulley 3 is rotationally driven by external power from an engine or the like, and the electromagnetic clutch 3a therein is turned on, the rotation of the pulley-with-clutch 3 is transmitted to the main shaft 27 and formed eccentrically at the inner end of the main shaft 27 The crank pin 27 a causes the orbiting scroll 31 of the compression mechanism 30 to orbit and revolve with respect to the fixed scroll (not shown) via the drive bush 28 and the drive bearing 29. As a result, the refrigerant sucked from the suction port 4 is compressed and discharged from the discharge port 5 shown in FIG.

冷媒中には冷凍機油が所定の比率で含有されており、軸受部２６および圧縮機構３０といった内部機構部が、冷媒中に含まれる冷凍機油のミストによって潤滑されるようになっている。そして、前述の通り、図１に示す上流側の油分離器８の底部から延出する油戻し管路１６の他端が、ハウジング２５の内部に形成された給油通路３５に接続されて軸受部２６に繋がっている。この給油通路３５は、軸受部２６におけるサブ軸受２６ｂとリップシール２６ｃとの間の環状空間Ｓに連通している。なお、軸受部２６に限らず、必要に応じて他の内部機構部に油戻し管路１６を連通させてもよい。   Refrigerating machine oil is contained in the refrigerant in a predetermined ratio, and the internal mechanism parts such as the bearing part 26 and the compression mechanism 30 are lubricated by refrigeration oil mist contained in the refrigerant. As described above, the other end of the oil return pipe 16 extending from the bottom of the upstream oil separator 8 shown in FIG. 1 is connected to the oil supply passage 35 formed inside the housing 25 to be a bearing part. 26. The oil supply passage 35 communicates with the annular space S between the sub bearing 26 b and the lip seal 26 c in the bearing portion 26. In addition, you may make the oil return pipe line 16 communicate with not only the bearing part 26 but another internal mechanism part as needed.

冷凍装置１は以上のように構成されている。
圧縮機２により圧縮された高温・高圧の冷媒は、吐出ポート５から吐出されて冷媒回路７を流れ、上流側の油分離器８と下流側の油分離器９とを順次通過する際に含有されている大部分の冷凍機油を分離される。冷凍機油を分離された圧縮冷媒は凝縮器１０に流れ、ここで冷却ファン１０ａにより外気と熱交換されて冷却されることにより凝縮されて大半が液相状となる。その際には予め冷媒中の冷凍機油が油分離器８，９において分離されているので熱伝導が阻害されない。 The refrigeration apparatus 1 is configured as described above.
The high-temperature and high-pressure refrigerant compressed by the compressor 2 is discharged from the discharge port 5, flows through the refrigerant circuit 7, and is contained when sequentially passing through the upstream oil separator 8 and the downstream oil separator 9. Most of the refrigerating machine oil that has been separated. The compressed refrigerant from which the refrigerating machine oil has been separated flows into the condenser 10, where it is condensed by being cooled by being exchanged with the outside air by the cooling fan 10a and cooled to become a liquid phase. At that time, since the refrigeration oil in the refrigerant is separated in advance in the oil separators 8 and 9, heat conduction is not hindered.

次に、凝縮冷媒はレシーバ１１で気液分離され、液相状の凝縮冷媒のみが膨張弁１２において膨張して適切な圧力に設定されて蒸発器１３に流れる。凝縮冷媒は蒸発器１３で気化することにより蒸発器１３の熱を奪い、同時に送風ファン１３ａが作動することにより冷蔵室内の空気が蒸発器１３により冷却されて冷蔵室内に吹き出され、冷蔵室内の冷却に供される。蒸発器１３で気化した冷媒はアキュムレータ１４において未蒸発の液相状冷媒を分離され、気相状冷媒のみが再び圧縮機２の吸入ポート４に吸入される。   Next, the condensed refrigerant is gas-liquid separated by the receiver 11, and only the liquid-phase condensed refrigerant is expanded in the expansion valve 12, is set to an appropriate pressure, and flows to the evaporator 13. The condensed refrigerant takes the heat of the evaporator 13 by being vaporized by the evaporator 13, and at the same time, the air in the refrigerator compartment is cooled by the evaporator 13 and blown into the refrigerator compartment by operating the blower fan 13a. To be served. The refrigerant vaporized by the evaporator 13 is separated from the non-evaporated liquid-phase refrigerant in the accumulator 14, and only the gas-phase refrigerant is sucked into the suction port 4 of the compressor 2 again.

下流側の油分離器９において圧縮冷媒から分離された冷凍機油は、キャピラリチューブ２１を通過して圧力を低減され、油戻し管路１７を経て圧縮機２の吸入側、即ち吸入ポート４に繋がる下流側区間に戻される。冷媒回路７に戻された冷凍機油は冷媒に混合されて圧縮機２に吸入され、圧縮機２内部の軸受部２６や圧縮機構３０といった内部機構をミスト潤滑する。   The refrigerating machine oil separated from the compressed refrigerant in the downstream oil separator 9 passes through the capillary tube 21 to be reduced in pressure, and is connected to the suction side of the compressor 2, that is, the suction port 4 through the oil return pipe 17. Returned to the downstream section. The refrigerating machine oil returned to the refrigerant circuit 7 is mixed with the refrigerant and sucked into the compressor 2, and mist lubricates internal mechanisms such as the bearing portion 26 and the compression mechanism 30 inside the compressor 2.

一方、上流側の油分離器８において圧縮冷媒から分離された冷凍機油は、電磁弁２０が開いていればキャピラリチューブ１９を通過して圧力を低減され、油戻し管路１６と圧縮機２の給油通路３５（図２参照）とを経て軸受部２６に直接供給される。具体的には、図２に示すように、軸受部２６に画成された環状空間Ｓに流れた冷凍機油は、サブ軸受２６ｂとリップシール２６ｃとに流れてこれらを潤滑する。サブ軸受２６ｂを潤滑した冷凍機油はさらにメイン軸受２６ａを潤滑した後、冷媒に混合されて吐出ポート５から冷媒回路７に吐出される。   On the other hand, the refrigerating machine oil separated from the compressed refrigerant in the upstream oil separator 8 is reduced in pressure by passing through the capillary tube 19 if the electromagnetic valve 20 is open, and the oil return line 16 and the compressor 2 The oil is directly supplied to the bearing portion 26 through the oil supply passage 35 (see FIG. 2). Specifically, as shown in FIG. 2, the refrigerating machine oil that has flowed into the annular space S defined in the bearing portion 26 flows into the sub-bearing 26b and the lip seal 26c to lubricate them. The refrigerating machine oil that has lubricated the sub-bearing 26 b is further lubricated to the main bearing 26 a, and then mixed with the refrigerant and discharged from the discharge port 5 to the refrigerant circuit 7.

従来のミスト潤滑のみによる潤滑では、開放型の圧縮機２における軸受部２６のサブ軸受２６ｂやリップシール２６ｃが十分に潤滑されない虞があったが、本実地形態によれば、軸受部２６に油戻し管路１６から戻り油が直接供給されるため、戻り油を有効に利用してミスト潤滑による潤滑が困難な軸受部２６を強制的に潤滑し、軸受部２６の潤滑条件を改善することができる。   With conventional mist lubrication alone, there is a risk that the sub-bearing 26b and lip seal 26c of the bearing portion 26 in the open type compressor 2 may not be sufficiently lubricated. Since the return oil is directly supplied from the return pipe 16, the return oil can be effectively used to forcibly lubricate the bearing portion 26, which is difficult to lubricate by mist lubrication, and improve the lubrication conditions of the bearing portion 26. it can.

しかも、本実施形態によれば、油分離器８，９によって回収された冷凍機油の戻り先が圧縮機２の吸入側と軸受部２６とに分散されるため、冷凍装置１の停止時に戻り油の全量が圧縮機２の吸入側に集中することがない。したがって、圧縮機２の起動時における液圧縮を防止することができる。また、従来のように戻り油がアキュムレータ１４に戻るよう圧縮機２とアキュムレータ１４との間に高低差を設ける必要性が低下し、アキュムレータ１４の配置位置の自由度が高められる。   Moreover, according to the present embodiment, the return destination of the refrigerating machine oil collected by the oil separators 8 and 9 is distributed to the suction side of the compressor 2 and the bearing portion 26, so that the return oil when the refrigerating apparatus 1 is stopped. Is not concentrated on the suction side of the compressor 2. Therefore, liquid compression at the time of starting of the compressor 2 can be prevented. Further, the necessity of providing a height difference between the compressor 2 and the accumulator 14 so that the return oil returns to the accumulator 14 as in the conventional case is reduced, and the degree of freedom of the arrangement position of the accumulator 14 is increased.

軸受部２６に接続される油戻し管路１６は、上流側の油分離器８から延出しているが、上流側の油分離器８には下流側の油分離器９よりも多くの冷凍機油が回収されるため、上流側の油分離器８から延出する油戻し管路１６を圧縮機２の軸受部２６に接続することにより、軸受部２６への給油量を多くして潤滑条件を確実に向上させることができる。
また、冷凍機油の回収量が少ない下流側の油分離器９から延出する油戻し管路１７が圧縮機２の吸入側に接続されているため、冷凍装置１の停止時に圧縮機２の吸入側に戻る冷凍機油の量を減少させ、圧縮機２の起動時における液圧縮を有効に防止することができる。 The oil return line 16 connected to the bearing portion 26 extends from the upstream oil separator 8, but the upstream oil separator 8 has more refrigeration oil than the downstream oil separator 9. Therefore, by connecting the oil return pipe 16 extending from the upstream oil separator 8 to the bearing portion 26 of the compressor 2, the amount of oil supplied to the bearing portion 26 is increased and the lubrication condition is improved. It can certainly be improved.
In addition, since the oil return pipe 17 extending from the downstream oil separator 9 with a small amount of recovered refrigeration oil is connected to the suction side of the compressor 2, the suction of the compressor 2 is stopped when the refrigeration apparatus 1 is stopped. The amount of refrigerating machine oil returning to the side can be reduced, and liquid compression at the time of starting the compressor 2 can be effectively prevented.

上記のように、上流側の油分離器８は冷凍機油の回収量が多いが、この油分離器８から延出する油戻し管路１６に電磁弁２０を設けたことにより、圧縮機２の軸受部２６に供給される戻り油の量を必要に応じて制御することができる。
例えば、冷凍装置１の中〜高負荷運転時には、圧縮機２を通過する冷媒量が多いことから冷媒中に含まれる冷凍機油の霧によるミスト潤滑が良好になる。このため、電磁弁２０を閉じるか開度を小さくして軸受部２６への戻り油の供給を停止させるか供給量を少なくし、冷凍装置１の系統内に冷凍機油が過剰に供給されることを抑制することができる。 As described above, the oil separator 8 on the upstream side has a large amount of recovered refrigeration oil. By providing the electromagnetic valve 20 in the oil return line 16 extending from the oil separator 8, the compressor 2 The amount of return oil supplied to the bearing portion 26 can be controlled as necessary.
For example, during medium to high load operation of the refrigeration apparatus 1, since the amount of refrigerant passing through the compressor 2 is large, mist lubrication due to mist of refrigerating machine oil contained in the refrigerant is improved. For this reason, the solenoid valve 20 is closed or the opening degree is reduced to stop the supply of the return oil to the bearing portion 26 or the supply amount is reduced, and the refrigerating machine oil is excessively supplied into the system of the refrigeration apparatus 1. Can be suppressed.

また、冷凍装置１の低負荷運転時や、蒸発器１３の温度および冷媒圧力がより低下する冷凍運転時等においては、吸入冷媒の密度が低下し、システム全体の冷媒循環量が低下して圧縮機２を通過する冷媒量が減少し、冷媒中に含まれる冷凍機油の霧によるミスト潤滑のみでは軸受部２６の潤滑が不足する可能性がある。このような場合には電磁弁２０を開き、軸受部２６に戻り油を供給することによって軸受部２６を強制的に潤滑し、軸受部２６の潤滑条件を改善することができる。   In addition, during low-load operation of the refrigeration apparatus 1 or during refrigeration operation in which the temperature of the evaporator 13 and the refrigerant pressure are further reduced, the density of the suction refrigerant is reduced, and the refrigerant circulation amount of the entire system is reduced and compressed. There is a possibility that the amount of refrigerant passing through the machine 2 will decrease, and the lubrication of the bearing portion 26 may be insufficient only with mist lubrication caused by mist of refrigerating machine oil contained in the refrigerant. In such a case, the solenoid valve 20 is opened and the return oil is supplied to the bearing portion 26 to forcibly lubricate the bearing portion 26, so that the lubrication condition of the bearing portion 26 can be improved.

さらに、冷凍装置１の停止時には、電磁弁２０を閉じておくことにより、油分離器８に回収された冷凍機油が高低差圧により油戻し管路１６を流下して圧縮機２に溜まることを防止できる。これにより、圧縮機２の起動時における液圧縮を回避することができる。なお、必要に応じて下流側の油分離器９から延出する油戻し管路１７にも電磁弁２０を設けることが考えられる。これにより、冷凍装置１の停止時における油分離器９からの戻り油が圧縮機２の吸入側に過剰に流下することを抑制できる。   Further, when the refrigerating apparatus 1 is stopped, the solenoid valve 20 is closed so that the refrigerating machine oil recovered by the oil separator 8 flows down the oil return line 16 due to the high and low differential pressure and accumulates in the compressor 2. Can be prevented. Thereby, the liquid compression at the time of starting of the compressor 2 can be avoided. In addition, it is possible to provide the solenoid valve 20 also in the oil return pipe line 17 extended from the downstream oil separator 9 as needed. Thereby, it is possible to suppress the return oil from the oil separator 9 from flowing down excessively to the suction side of the compressor 2 when the refrigeration apparatus 1 is stopped.

以上のように、本実施形態に係る冷凍装置１によれば、油分離器８，９からの戻り油を有効に利用して圧縮機２の潤滑条件を改善するとともに、圧縮機２の起動時における液圧縮を防止することができる。   As described above, according to the refrigeration apparatus 1 according to the present embodiment, the return oil from the oil separators 8 and 9 is effectively used to improve the lubrication conditions of the compressor 2 and at the time of starting the compressor 2. The liquid compression in can be prevented.

［第２実施形態］
図３は、本発明の第２実施形態を示す冷凍装置の概略構成図である。
この冷凍装置５１は、図１に示す冷凍装置１とは逆に、上流側の油分離器８から延出する油戻し管路１６が圧縮機２の吸入側に接続され、下流側の油分離器９から延出する油戻し管路１７が圧縮機２の軸受部２６に接続されている。戻り油の量が多い油戻し管路１６には電磁弁２０を設けるのが好ましい。必要に応じて油戻し管路１７にも電磁弁２０を設けてよい。その他の構成は第１実施形態の冷凍装置１と同様である。 [Second Embodiment]
FIG. 3 is a schematic configuration diagram of a refrigeration apparatus showing a second embodiment of the present invention.
In the refrigeration apparatus 51, contrary to the refrigeration apparatus 1 shown in FIG. 1, an oil return line 16 extending from the upstream oil separator 8 is connected to the suction side of the compressor 2, and the downstream oil separation is performed. An oil return pipe 17 extending from the vessel 9 is connected to the bearing portion 26 of the compressor 2. It is preferable to provide an electromagnetic valve 20 in the oil return line 16 having a large amount of return oil. The oil return pipe 17 may be provided with an electromagnetic valve 20 as necessary. Other configurations are the same as those of the refrigeration apparatus 1 of the first embodiment.

この冷凍装置５１によれば、第１実施形態の冷凍装置１と同じく、油分離器８，９によって回収された冷凍機油の戻り先が圧縮機２の吸入側と軸受部２６とに分散されるため、冷凍装置５１の停止時に戻り油の全量が圧縮機２の吸入側に集中することを避け、圧縮機２の起動時における液圧縮を防止することができる。   According to the refrigeration apparatus 51, as with the refrigeration apparatus 1 of the first embodiment, the return destination of the refrigeration oil recovered by the oil separators 8 and 9 is distributed to the suction side of the compressor 2 and the bearing portion 26. Therefore, it is possible to prevent the entire amount of return oil from concentrating on the suction side of the compressor 2 when the refrigeration apparatus 51 is stopped, and to prevent liquid compression when the compressor 2 is started.

また、冷凍機油の回収量が少ない下流側の油分離器９からの戻り油が圧縮機２の軸受部２６に戻るようになっているため、油戻し管路１７に電磁弁２０を設けずにキャピラリチューブ２１のみによる減圧を行う構成であっても、冷凍装置５１の停止時に圧縮機２に流下する戻り油の量が過大にならず、この点でも圧縮機２の起動時における液圧縮を防止することができる。   Further, since the return oil from the downstream oil separator 9 with a small amount of recovered refrigeration oil is returned to the bearing portion 26 of the compressor 2, the solenoid valve 20 is not provided in the oil return line 17. Even when the pressure is reduced only by the capillary tube 21, the amount of return oil flowing down to the compressor 2 when the refrigeration apparatus 51 is stopped does not become excessive, and also in this respect, liquid compression at the time of starting the compressor 2 is prevented. can do.

なお、本発明は上記の第１、第２実施形態の構成のみに限定されるものではなく、適宜変更や改良を加えることができ、このように変更や改良を加えた実施形態も本発明の権利範囲に含まれるものとする。
例えば、上記実施形態では、圧縮機２が開放型であるものとして説明したが、密閉型の圧縮機（電動機一体型圧縮機等）であってもよい。
油戻し管路１６，１７に電磁弁２０を設ける場合は、電磁弁２０に流量調整機能を持たせることにより、キャピラリチューブ１９，２１を省略することも考えられる。
また、冷媒回路７に接続されている各構成機器類の種類や形状、位置等は、必ずしも上記実施形態のものである必要はない。 Note that the present invention is not limited to the configurations of the first and second embodiments described above, and can be appropriately modified or improved. Embodiments with such modifications and improvements are also applicable to the present invention. It shall be included in the scope of rights.
For example, in the above-described embodiment, the compressor 2 has been described as an open type, but may be a hermetic compressor (such as a motor-integrated compressor).
When the solenoid valve 20 is provided in the oil return pipes 16 and 17, it may be considered that the capillary tubes 19 and 21 are omitted by providing the solenoid valve 20 with a flow rate adjusting function.
In addition, the types, shapes, positions, and the like of each component device connected to the refrigerant circuit 7 do not necessarily have to be those of the above embodiment.

１，５１ 冷凍装置
２ 圧縮機
７ 冷媒回路
８，９ 油分離器
１６，１７ 油戻し管路
１９，２１ キャピラリチューブ
２０ 電磁弁（開閉弁）
２６ 軸受部（圧縮機の内部機構部）
２６ａ メイン軸受（軸受部材）
２６ｂ サブ軸受（軸受部材）
２６ｃ リップシール（軸シール部材） DESCRIPTION OF SYMBOLS 1,51 Refrigeration apparatus 2 Compressor 7 Refrigerant circuit 8, 9 Oil separators 16, 17 Oil return lines 19, 21 Capillary tube 20 Electromagnetic valve (open / close valve)
26 Bearing (compressor internal mechanism)
26a Main bearing (bearing member)
26b Sub bearing (bearing member)
26c Lip seal (shaft seal member)

Claims (4)

冷媒を圧縮する圧縮機と、
前記圧縮機の吐出側から延出する冷媒回路に直列に接続され、前記圧縮機から吐出される前記冷媒中に含まれる冷凍機油を分離・回収する複数の油分離器と、
複数の前記油分離器から延出する複数の油戻し管路と、を備え、
複数の前記油戻し管路の１本は前記圧縮機の吸入側に接続され、
複数の前記油戻し管路の別な１本は前記圧縮機の内部機構部に接続されている冷凍装置。 A compressor for compressing the refrigerant;
A plurality of oil separators connected in series to a refrigerant circuit extending from the discharge side of the compressor, for separating and recovering refrigerating machine oil contained in the refrigerant discharged from the compressor;
A plurality of oil return lines extending from the plurality of oil separators,
One of the plurality of oil return lines is connected to the suction side of the compressor;
Another one of the plurality of oil return pipes is a refrigeration apparatus connected to an internal mechanism of the compressor. 前記圧縮機は、前記内部機構部が前記冷凍機油のミストによって潤滑される開放型圧縮機であり、
前記内部機構部に接続される前記油戻し管路は、前記内部機構部のうちの軸受部における軸受部材または軸シール部材の少なくとも一方に接続されている請求項１に記載の冷凍装置。 The compressor is an open-type compressor in which the internal mechanism is lubricated by refrigeration oil mist.
The refrigeration apparatus according to claim 1, wherein the oil return pipe connected to the internal mechanism is connected to at least one of a bearing member or a shaft seal member in a bearing portion of the internal mechanism. 前記内部機構部に接続される前記油戻し管路は、前記複数の油分離器のうち、最も上流側のものから延出している請求項１に記載の冷凍装置。   2. The refrigeration apparatus according to claim 1, wherein the oil return pipe connected to the internal mechanism extends from the most upstream one of the plurality of oil separators. 前記内部機構部に接続される前記油戻し管路に開閉弁が設けられている請求項１に記載の冷凍装置。   The refrigeration apparatus according to claim 1, wherein an opening / closing valve is provided in the oil return pipe connected to the internal mechanism.
JP2016135069A 2016-07-07 2016-07-07 Freezer Active JP6758963B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016135069A JP6758963B2 (en) 2016-07-07 2016-07-07 Freezer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016135069A JP6758963B2 (en) 2016-07-07 2016-07-07 Freezer

Publications (2)

Publication Number Publication Date
JP2018004220A true JP2018004220A (en) 2018-01-11
JP6758963B2 JP6758963B2 (en) 2020-09-23

Family

ID=60946123

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016135069A Active JP6758963B2 (en) 2016-07-07 2016-07-07 Freezer

Country Status (1)

Country Link
JP (1) JP6758963B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112648754A (en) * 2020-12-14 2021-04-13 青岛海信日立空调***有限公司 Air conditioner circulating system and circulating method thereof
CN115342559A (en) * 2022-08-19 2022-11-15 江苏拓米洛环境试验设备有限公司 Refrigerating system and one-driving-multiple environment simulation test box

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4897142A (en) * 1972-02-22 1973-12-11
JPS54109645A (en) * 1978-02-17 1979-08-28 Hitachi Ltd Refrigerating device with screw compressor
JPH02131171U (en) * 1989-04-05 1990-10-31
JPH0593553A (en) * 1991-10-02 1993-04-16 Hitachi Ltd Helium gas compression device
JPH0626714A (en) * 1992-07-08 1994-02-04 Mitsubishi Heavy Ind Ltd Refrigerant circuit of air conditioner
JPH06229634A (en) * 1993-02-01 1994-08-19 Sanyo Electric Co Ltd Freezer
JPH10253177A (en) * 1997-03-12 1998-09-25 Zexel Corp Compressor for transition critical refrigerating cycle
JPH1194378A (en) * 1997-09-25 1999-04-09 Kobe Steel Ltd Oil-cooled refrigerator
JP2001349644A (en) * 2000-06-06 2001-12-21 Fujitsu General Ltd Air conditioner
JP2003042603A (en) * 2001-08-02 2003-02-13 Mitsubishi Electric Corp Refrigerating cycle apparatus, method for manufacturing the same and method for operating the same
JP2005345016A (en) * 2004-06-03 2005-12-15 Samsung Electronics Co Ltd Air conditioner, and operation method of air conditioner
JP2008144643A (en) * 2006-12-08 2008-06-26 Mitsubishi Heavy Ind Ltd Multiple stage compressor and refrigeration cycle using the same
JP2015038407A (en) * 2013-08-19 2015-02-26 ダイキン工業株式会社 Refrigerating device

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4897142A (en) * 1972-02-22 1973-12-11
JPS54109645A (en) * 1978-02-17 1979-08-28 Hitachi Ltd Refrigerating device with screw compressor
JPH02131171U (en) * 1989-04-05 1990-10-31
JPH0593553A (en) * 1991-10-02 1993-04-16 Hitachi Ltd Helium gas compression device
JPH0626714A (en) * 1992-07-08 1994-02-04 Mitsubishi Heavy Ind Ltd Refrigerant circuit of air conditioner
JPH06229634A (en) * 1993-02-01 1994-08-19 Sanyo Electric Co Ltd Freezer
JPH10253177A (en) * 1997-03-12 1998-09-25 Zexel Corp Compressor for transition critical refrigerating cycle
JPH1194378A (en) * 1997-09-25 1999-04-09 Kobe Steel Ltd Oil-cooled refrigerator
JP2001349644A (en) * 2000-06-06 2001-12-21 Fujitsu General Ltd Air conditioner
JP2003042603A (en) * 2001-08-02 2003-02-13 Mitsubishi Electric Corp Refrigerating cycle apparatus, method for manufacturing the same and method for operating the same
JP2005345016A (en) * 2004-06-03 2005-12-15 Samsung Electronics Co Ltd Air conditioner, and operation method of air conditioner
JP2008144643A (en) * 2006-12-08 2008-06-26 Mitsubishi Heavy Ind Ltd Multiple stage compressor and refrigeration cycle using the same
JP2015038407A (en) * 2013-08-19 2015-02-26 ダイキン工業株式会社 Refrigerating device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112648754A (en) * 2020-12-14 2021-04-13 青岛海信日立空调***有限公司 Air conditioner circulating system and circulating method thereof
CN112648754B (en) * 2020-12-14 2023-07-14 青岛海信日立空调***有限公司 Air conditioner circulation system and circulation method thereof
CN115342559A (en) * 2022-08-19 2022-11-15 江苏拓米洛环境试验设备有限公司 Refrigerating system and one-driving-multiple environment simulation test box

Also Published As

Publication number Publication date
JP6758963B2 (en) 2020-09-23

Similar Documents

Publication Publication Date Title
US8109116B2 (en) Dual compressor air conditioning system with oil level regulation
US5884498A (en) Turborefrigerator
EP2766676B1 (en) Motor cooling and sub-cooling circuits for compressor
KR100846567B1 (en) Refrigerating apparatus
US3514225A (en) Motor driven compressors for refrigerating machines
EP0852324B1 (en) Refrigerant circulating apparatus
JP4114337B2 (en) Refrigeration equipment
US9816506B2 (en) Intermediate oil separator for improved performance in a scroll compressor
JPH11351168A (en) Screw type refrigerating device
JP6758963B2 (en) Freezer
CN103175346B (en) Oil injection type split-compressor and heat pump
JP4815808B2 (en) Rotary compressor
EP3604813B1 (en) Two-stage compressor
JP5478927B2 (en) Refrigeration equipment
JP2009063234A (en) Compressor lubricating system
CN108072198B (en) Compressor assembly, control method thereof and refrigerating/heating system
JP5276499B2 (en) Refrigeration equipment
US20160116190A1 (en) Turbo refrigerator
US10288069B2 (en) Refrigerant compressor lubricant viscosity enhancement
JP5934931B2 (en) Tank for refrigeration cycle apparatus and refrigeration cycle apparatus including the same
JP2000337282A (en) Two-stage type screw compressor
JP5554039B2 (en) Transportation refrigeration equipment
US11162495B2 (en) Oil circulation in a scroll compressor
KR20200057455A (en) Air Conditioning System
JP2002039635A (en) Air conditioner

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20170621

A625 Written request for application examination (by other person)

Free format text: JAPANESE INTERMEDIATE CODE: A625

Effective date: 20190425

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200421

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20200619

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20200804

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20200902

R150 Certificate of patent or registration of utility model

Ref document number: 6758963

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150