JPH0351680A - Refrigerating cycle of air conditioner - Google Patents
Refrigerating cycle of air conditionerInfo
- Publication number
- JPH0351680A JPH0351680A JP18461989A JP18461989A JPH0351680A JP H0351680 A JPH0351680 A JP H0351680A JP 18461989 A JP18461989 A JP 18461989A JP 18461989 A JP18461989 A JP 18461989A JP H0351680 A JPH0351680 A JP H0351680A
- Authority
- JP
- Japan
- Prior art keywords
- compressor
- oil
- refrigerant
- separated
- refrigerating machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000007906 compression Methods 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000005057 refrigeration Methods 0.000 claims description 35
- 239000010721 machine oil Substances 0.000 claims description 32
- 239000003921 oil Substances 0.000 claims description 31
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims 1
- 239000003507 refrigerant Substances 0.000 abstract description 40
- 230000006835 compression Effects 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は空気調和機の冷凍サイクルに係シ、特に油分離
器を備えた空気調和機の冷凍サイクルに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigeration cycle for an air conditioner, and particularly to a refrigeration cycle for an air conditioner equipped with an oil separator.
従来の冷凍サイクルは、特開昭６５−１２９２５５号公
報に記載のように、四方切換弁と室内熱交換器との間の
管路、四方切換弁と室外熱交換器との間の管路に夫々液
留め容器を設け、この液留め容器の下部を圧縮機の冷媒
吸込側通路忙連結させたものがある。これは冷房、ｍ房
運転時にそれぞれ圧縮機吐出側にあたる液留め容器を油
分離器として作用させ、分離した冷凍機油を圧縮機の冷
媒吸込側通路にもどす冷凍サイクルとなっていた。As described in Japanese Patent Application Laid-Open No. 65-129255, a conventional refrigeration cycle has a pipe line between a four-way switching valve and an indoor heat exchanger, and a pipe line between a four-way switching valve and an outdoor heat exchanger. There is a type in which a liquid retaining container is provided in each case, and the lower part of the liquid retaining container is connected to the refrigerant suction side passage of the compressor. This is a refrigeration cycle in which a liquid storage container on the discharge side of the compressor acts as an oil separator during cooling and room operation, and the separated refrigerating machine oil is returned to the refrigerant suction side passage of the compressor.
またインジエクシ四ン回路を有する冷凍サイクルは、冷
媒の一部を圧縮機にバイパスするものである。なおこの
種の冷凍サイクルに関連するものには特開昭６２−２７
６５７０号が挙げられゐ。Furthermore, a refrigeration cycle having a four-injector circuit bypasses a portion of the refrigerant to the compressor. For information related to this type of refrigeration cycle, see Japanese Patent Application Laid-Open No. 62-27.
No. 6570 is mentioned.
上記従来技術は、圧縮機の高圧側で分離された冷凍機油
が、圧縮機の低圧側にもどされるため、冷凍機油ととも
に冷媒も圧縮機の低圧側にもどされてしまい、熱交換器
内の冷媒循環量が減少してしまう点について配慮がされ
ておらず、冷房、暖房能力が減少してしまうという問題
があった〇本発明の目的は、圧縮機から吐出された冷凍
機油を冷房、暖房能力に影響を与えずに圧縮機にもどし
、効率の良い冷凍サイクルを実現することにある。In the above conventional technology, the refrigerating machine oil separated on the high pressure side of the compressor is returned to the low pressure side of the compressor, so the refrigerant is also returned to the low pressure side of the compressor along with the refrigerating machine oil, and the refrigerant in the heat exchanger is returned to the low pressure side of the compressor. There was a problem that the cooling and heating capacity was reduced because no consideration was given to the reduction in the amount of circulation.The purpose of the present invention is to improve the cooling and heating capacity of the refrigerating machine oil discharged from the compressor. The objective is to return the refrigeration to the compressor without affecting the refrigeration cycle, thereby realizing an efficient refrigeration cycle.
本発明の他の目的は、圧縮機より吐出された冷凍機油を
有効に利用して冷凍サイクルの性能を向上させることに
ある。Another object of the present invention is to effectively utilize refrigeration oil discharged from a compressor to improve the performance of a refrigeration cycle.
上記目的を達成するために、圧縮機の冷媒の吐出側に油
分離器を設け、分離された冷凍機油を圧縮機の圧縮工程
中にバイパスするインジス２フ１フ回路としたものであ
る。In order to achieve the above object, an oil separator is provided on the refrigerant discharge side of the compressor, and an ingis 2-flush circuit is used to bypass the separated refrigerating machine oil during the compression process of the compressor.
また、圧縮機吐出冷媒温度と入力を低下させるために、
インジェクシ冒ン回路に冷凍機油冷却用の熱交換器を設
けたものである。Also, to reduce compressor discharge refrigerant temperature and input,
A heat exchanger for cooling the refrigerating machine oil is installed in the injection circuit.
さらに、上記項目の他に、暖房時に高暖力を得るため、
冷凍機油冷却用の熱交換器にバイパスする回路を設け、
さらに冷凍機油の流路を切シ換える弁を設けたものであ
る。In addition to the above items, in order to obtain high heating power during heating,
A bypass circuit is installed in the heat exchanger for cooling the refrigerating machine oil.
Furthermore, a valve is provided to switch the flow path of the refrigerating machine oil.
圧縮機よ）冷媒とともに吐出された冷凍機油は油分離器
によって冷媒と冷凍機油に分離され、分離された冷凍機
油は、圧縮機へバイパスされたインジェクション回路を
通シ、圧縮機の中間圧へもどされる。この様にすること
により、油分離器から冷凍機油と伴にガス冷媒が圧縮機
に戻っても、冷媒循環量の低下を起こさずくすみ、能力
の低下を防止できる。The refrigeration oil discharged together with the refrigerant (compressor) is separated into refrigerant and refrigeration oil by an oil separator, and the separated refrigeration oil is passed through an injection circuit bypassed to the compressor and returned to the intermediate pressure of the compressor. It will be done. By doing so, even if the gas refrigerant returns to the compressor together with the refrigerating machine oil from the oil separator, the refrigerant circulation amount does not decrease and the capacity is prevented from decreasing.
また冷凍サイクル内への冷凍機油の吐出を防止できるた
め、圧縮機内の油量の低下による信頼性の低下を無くす
とともに、冷凍サイクル内の冷凍機油循環による配管損
失の増大や、熱交換器部での冷媒側熱伝達率の低下とよ
る性能低下を防止できる■
またインジェクシ璽ン回路に戻す冷凍機油を冷却するこ
とにより、圧縮動力を少なくでき入力の少ない冷凍サイ
クルが実現できる。In addition, since it is possible to prevent refrigeration oil from being discharged into the refrigeration cycle, it eliminates a decrease in reliability due to a decrease in the amount of oil in the compressor, and also prevents an increase in piping loss due to the circulation of refrigeration oil in the refrigeration cycle, and prevents damage to the heat exchanger section. It is possible to prevent performance deterioration due to a decrease in the heat transfer coefficient on the refrigerant side. Also, by cooling the refrigeration oil that is returned to the injector circuit, compression power can be reduced and a refrigeration cycle with less input can be realized.
以下、本発明の一実施例を第１図、第２図、第３図によ
り説明する〇
第１図は、本発明の実施例を示す冷媒回路図であシ、１
は圧縮機、２は油分離器、５は四方切換弁、４は室外熱
交換器、５は減圧装置、６は室内熱変換器、７は油の流
路を切シ換える切）換え弁。Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1, 2, and 3. FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention.
2 is a compressor, 2 is an oil separator, 5 is a four-way switching valve, 4 is an outdoor heat exchanger, 5 is a pressure reducing device, 6 is an indoor heat converter, and 7 is a switching valve for switching the oil flow path.
８は油冷却用の熱変換器、９は高圧の冷凍機油を圧縮機
の中間圧にする減圧装置、及びそれぞれの機器を接続す
る配管よ多構成されている。Numeral components include a heat converter 8 for cooling oil, a pressure reducing device 9 that converts high-pressure refrigerating machine oil to an intermediate pressure of the compressor, and piping that connects each device.
圧縮機１より冷凍機油とともに吐出された冷媒は、油分
離器２によって冷媒と冷凍機油に分離される。分離され
た冷媒は、冷房時には四方切換弁３によって室外熱交換
器４＆Ｃ送られて液化し、威圧装置５で減圧され室内熱
交換器６で蒸発し四方切換弁５を通シ圧縮機１にもどさ
れる。暖房時には、四方切換弁３によって室内熱交換器
６に送られて液化し、減圧装置５によって減圧され室外
熱交換器４で蒸発し、四方切換弁３を通シ圧縮機１にも
どされる通常の流路を通る。一方、分離された冷凍機油
は、流路切換弁７１Ｃよって冷凍機油冷却用の熱交換器
８を通る回路か、そのままバイパスする回路かに流路を
切）換え、減圧装置９によって高圧の冷凍機油を圧縮機
の中間圧付近まで減圧され、圧縮機１のインジェクシ嘗
ンボートにもどされる・
このように構成された冷凍サイクルにおいて、圧縮機よ
り冷媒とともに吐出された冷凍機油は、油分離器２によ
って分離されるため、冷媒の熱伝達率の低下、圧力損失
の増大等の、冷凍機油が冷凍サイクルに与える影響を排
除することができる。The refrigerant discharged from the compressor 1 together with refrigerating machine oil is separated into refrigerant and refrigerating machine oil by an oil separator 2. During cooling, the separated refrigerant is sent to the outdoor heat exchanger 4&C by the four-way switching valve 3, where it is liquefied, reduced in pressure by the pressure device 5, evaporated in the indoor heat exchanger 6, and returned to the compressor 1 through the four-way switching valve 5. It will be done. During heating, normal water is sent to the indoor heat exchanger 6 by the four-way switching valve 3 and liquefied, reduced in pressure by the pressure reducing device 5, evaporated in the outdoor heat exchanger 4, and returned to the compressor 1 through the four-way switching valve 3. Pass through the flow path. On the other hand, the flow path of the separated refrigerating machine oil is switched by the flow path switching valve 71C to a circuit that passes through the heat exchanger 8 for cooling the refrigerating machine oil or a circuit that directly bypasses the refrigerating machine oil, and the flow path of the separated refrigerating machine oil is changed by the pressure reducing device 9. The oil is depressurized to around the intermediate pressure of the compressor and returned to the injector boat of the compressor 1. In the refrigeration cycle configured in this way, the refrigeration oil discharged from the compressor together with the refrigerant is separated by the oil separator 2. Therefore, it is possible to eliminate the effects of refrigeration oil on the refrigeration cycle, such as a decrease in the heat transfer coefficient of the refrigerant and an increase in pressure loss.
この時、冷凍機油とともに冷媒が圧縮機にもどされても
、圧縮機の吸込側忙もどされるのではなく冷媒の圧縮過
程にもどされるインジェクシ胃ン回路となっているため
、圧縮機にもどった冷媒は吸込過程中に流入しないため
、冷凍サイクル内の冷媒循環量の低下を防止できること
になっている。At this time, even if the refrigerant is returned to the compressor together with the refrigeration oil, the refrigerant returned to the compressor is not returned to the suction side of the compressor, but is returned to the refrigerant compression process due to the injector intake circuit. Since the refrigerant does not flow in during the suction process, it is possible to prevent a decrease in the amount of refrigerant circulating within the refrigeration cycle.
また圧縮機よυ吐出された冷凍機油は、すぐに圧縮機に
もどされるため、圧縮機内の油量の低下が防止でき、圧
縮機の信頼性も向上する。In addition, since the refrigerating machine oil discharged from the compressor is immediately returned to the compressor, the amount of oil in the compressor can be prevented from decreasing, and the reliability of the compressor can also be improved.
また冷凍機油をインジエクシ冒ン回路で圧縮機にもどし
た場合の効果を第２図、第５図で説明するＯ
第２図は、冷凍機油流路切換弁７を破線矢印方向にした
場合のモリエル線図で、実線は本発明を実施した場合、
破線が従来のモリエル線図である〇従来の冷凍サイクル
では圧縮機に吸込まれた冷媒は等エントロピ線にそって
断熱圧縮され圧縮機吐出温度’ｒｏ となる。その断熱
圧縮の中間圧の位置の温度ｒｒ ｏ／に、油分離器によ
って分離された高温の冷凍機油をもどすと冷媒温度はｔ
ｒ ｏ／からＴ１′に変化し断熱圧縮されインジェクシ
冒ン回路にした場合の圧縮機吐出温度で１ となる。そ
の際に圧縮機のエンタルピ差はΔ１０＋Δ１ｏ′からΔ
１ｏ＋Δ１１′となシ（Δ１１′−Δ１ｏ′）ｘ冷媒循
環量分だけ圧縮仕事は多くなるが、凝縮機となる室内熱
交換器６のエンタルピ差がΔｉｏｏからΔ１ｏ１と大き
くなるため暖房能力は向上する。In addition, the effect of returning refrigerating machine oil to the compressor through the injection circuit is explained in Figs. 2 and 5. In the diagram, the solid line indicates when the present invention is implemented,
The broken line is a conventional Mollier diagram. In a conventional refrigeration cycle, the refrigerant sucked into the compressor is adiabatically compressed along an isentropic line and reaches the compressor discharge temperature 'ro. When the high temperature refrigerating machine oil separated by the oil separator is returned to the temperature rr o/ at the intermediate pressure position of the adiabatic compression, the refrigerant temperature becomes t.
It becomes 1 at the compressor discharge temperature when the temperature changes from r o/ to T1', adiabatic compression is performed, and the injector is in an open circuit. At that time, the enthalpy difference of the compressor is Δ10+Δ1o′ to Δ
1o + Δ11'(Δ11' - Δ1o') x The compression work increases by the refrigerant circulation amount, but the heating capacity improves because the enthalpy difference of the indoor heat exchanger 6, which serves as a condenser, increases from Δioo to Δ1o1. .
第５図は、冷凍機油の流路切換弁７を実線矢印方向に切
換えた場合のモリエル線図で、実線は本発明を実施した
場合、破線は従来のモリエル線図である◎従来の冷凍サ
イクルは上記と同様であるので省略する・油分離器７で
分離された冷凍機油を、油冷却用Ｏ熱交換器８で冷却し
て、断熱圧縮の途中の中間圧の位置の温度ｒｒｏ／の位
置にもどすと冷媒温度はＴ ２／となシ、等エントロピ
線にそって断熱圧縮され、インジェクション回路とした
場合の圧縮機吐出温度Ｔ２となシ、圧縮機吐出温度を下
げることができる。また圧縮機のエンタルピ差もΔ１ｏ
＋Δ１ｏ／からΔ１ｏ＋Δ１２′ となシ、圧縮仕事は
（Δ１ｏ′−Δｉ２′）×冷媒循環量分だけ少なくなる
。ここで冷媒機油は非圧縮性流体のため圧縮仕事には影
響しない。これによって蒸発器となる室内熱交換器６の
エンタルピ差、１、。を変化させることなく入力を減少
させることができる。Fig. 5 is a Mollier diagram when the refrigerating machine oil flow path switching valve 7 is switched in the direction of the solid arrow.The solid line is the Mollier diagram when the present invention is implemented, and the broken line is the conventional Mollier diagram.◎Conventional refrigeration cycle is the same as above and will be omitted. Refrigerating machine oil separated by the oil separator 7 is cooled by the oil cooling O heat exchanger 8, and the temperature rro/ is reached at the intermediate pressure position during adiabatic compression. When the refrigerant temperature is returned to T2/, the refrigerant is adiabatically compressed along an isentropic line, and the compressor discharge temperature can be lowered to T2 when an injection circuit is used. Also, the enthalpy difference of the compressor is Δ1o
From +Δ1o/ to Δ1o+Δ12', the compression work decreases by (Δ1o'-Δi2')×refrigerant circulation amount. Since the refrigerant machine oil is an incompressible fluid, it does not affect the compression work. As a result, the enthalpy difference of the indoor heat exchanger 6, which becomes an evaporator, is 1. The input can be reduced without changing the
このように油分離器２の下流に流路切換弁７を設けるこ
とによ）上記２つの冷凍サイクルを切υ換えることがで
きる。By providing the flow path switching valve 7 downstream of the oil separator 2 in this way, it is possible to switch between the two refrigeration cycles.
本発明によれば、圧縮機より冷媒とともに吐出した冷凍
機油を油分離器で分離させ４７９１２７１７回路で圧縮
機にもどすことにより、冷房、暖房性能に影響を与えず
に冷凍機油を圧縮機に回収することができ、圧縮機の信
頼性を向上させる効果がある〇
また、インジス２フ１フ回路に冷凍機油冷却用の熱交換
器を設けることによ）、圧縮機の圧縮仕事の低減、圧縮
機吐出冷媒温度を下げる効果があるＯ
さらに、上記熱変換器をバイパスする回路と５その上流
だ切シ換え弁を設けることにより、暖房能力を向上させ
る冷凍サイクルと、圧縮仕事の低減と圧縮機吐出冷媒温
度を下げる冷凍サイクルかを切シ換えることができる。According to the present invention, the refrigerating machine oil discharged from the compressor together with the refrigerant is separated by the oil separator and returned to the compressor through the 47912717 circuit, thereby recovering the refrigerating machine oil to the compressor without affecting the cooling and heating performance. 〇In addition, by installing a heat exchanger for cooling the refrigerating machine oil in the Ingis 2F 1F circuit), the compression work of the compressor can be reduced, and the compressor O has the effect of lowering the discharge refrigerant temperature.Furthermore, by providing a circuit that bypasses the heat converter and a switching valve upstream thereof, a refrigeration cycle that improves heating capacity, reduces compression work, and reduces compressor discharge. You can switch between the refrigeration cycle that lowers the refrigerant temperature.
第１図は本発明の一実施例を示す冷媒回路図、第２図は
分離した冷凍機油をバイパスしたインジェクシ璽ンサイ
クルの場合のモリエル線図、第３図は分離した冷凍機油
を冷凍機油冷却用の熱交換器を通したインジェクシｗｓ
７サイクルの場合のモリエル線図である。
１・・・圧縮機、 ２・・・油分離器、３・・・四方
切換弁、４・・・室外熱交換器、 ５・・・減圧
装置、６・・・室内熱交換器、 ７・・・流路切
換弁、８・・・冷凍機油冷却用熱交換器、
９・・・冷凍機油用減圧装置。Fig. 1 is a refrigerant circuit diagram showing an embodiment of the present invention, Fig. 2 is a Mollier diagram for an injection cycle in which separated refrigerating machine oil is bypassed, and Fig. 3 is a refrigerating machine oil cooling system using separated refrigerating machine oil. Injection through a heat exchanger for
It is a Mollier diagram in the case of 7 cycles. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Oil separator, 3... Four-way switching valve, 4... Outdoor heat exchanger, 5... Pressure reduction device, 6... Indoor heat exchanger, 7. ...Flow path switching valve, 8...Refrigerating machine oil cooling heat exchanger, 9...Refrigerating machine oil pressure reducing device.
Claims (1)
機の冷凍サイクルにおいて、上記圧縮機の吐出側に油分
離器を設け、分離した冷凍機油を圧縮機の圧縮工程中に
バイパスするインジェクション回路を有することを特徴
とする空気調和機の冷凍サイクル。 ２、上記インジェクション回路に冷凍機油冷却用の熱交
換器を設けたことを特徴とする特許請求の範囲第１項記
載の空気調和機の冷凍サイクル。 ３、上記冷凍機油冷却用熱交換器とそれをバイパスする
回路を設け、その上流に切り換え弁を有することを特徴
とする特許請求の範囲第１項記載の空気調和機の冷凍サ
イクル。[Claims] 1. In the refrigeration cycle of an air conditioner consisting of a compressor, a condenser, an evaporator, and a pressure reducer, an oil separator is provided on the discharge side of the compressor, and the separated refrigeration oil is transferred to the compressor. A refrigeration cycle for an air conditioner, characterized by having an injection circuit that bypasses during a compression process. 2. The refrigerating cycle for an air conditioner as set forth in claim 1, wherein the injection circuit is provided with a heat exchanger for cooling refrigerating machine oil. 3. The refrigeration cycle for an air conditioner according to claim 1, further comprising the refrigerating machine oil cooling heat exchanger and a circuit bypassing the heat exchanger, and having a switching valve upstream thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18461989A JPH0351680A (en) | 1989-07-19 | 1989-07-19 | Refrigerating cycle of air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18461989A JPH0351680A (en) | 1989-07-19 | 1989-07-19 | Refrigerating cycle of air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0351680A true JPH0351680A (en) | 1991-03-06 |
Family
ID=16156403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18461989A Pending JPH0351680A (en) | 1989-07-19 | 1989-07-19 | Refrigerating cycle of air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0351680A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970722A (en) * | 1996-12-19 | 1999-10-26 | Sharp Kabushiki Kaisha | Air conditioning apparatus returning refrigerating machine oil to compressor by two restrictors and method of controlling air conditioning apparatus |
| EP1065455A3 (en) * | 1999-06-30 | 2001-01-24 | Carrier Corporation | Hot gas compressor bypass using oil separator circuit |
| WO2009098862A1 (en) * | 2008-02-06 | 2009-08-13 | Daikin Industries, Ltd. | Refrigeration device |
| JP2010032196A (en) * | 2008-02-06 | 2010-02-12 | Daikin Ind Ltd | Refrigerating device |
| CN110411054A (en) * | 2019-07-09 | 2019-11-05 | 南京天加环境科技有限公司 | A kind of combustion-gas thermal pump air-conditioning system reducing lubricating oil temperature and control method |
-
1989
- 1989-07-19 JP JP18461989A patent/JPH0351680A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970722A (en) * | 1996-12-19 | 1999-10-26 | Sharp Kabushiki Kaisha | Air conditioning apparatus returning refrigerating machine oil to compressor by two restrictors and method of controlling air conditioning apparatus |
| EP1065455A3 (en) * | 1999-06-30 | 2001-01-24 | Carrier Corporation | Hot gas compressor bypass using oil separator circuit |
| WO2009098862A1 (en) * | 2008-02-06 | 2009-08-13 | Daikin Industries, Ltd. | Refrigeration device |
| JP2010032196A (en) * | 2008-02-06 | 2010-02-12 | Daikin Ind Ltd | Refrigerating device |
| JP2010032195A (en) * | 2008-02-06 | 2010-02-12 | Daikin Ind Ltd | Refrigerating device |
| US20100275634A1 (en) * | 2008-02-06 | 2010-11-04 | Tetsuya Okamoto | Refrigeration apparatus |
| AU2009210984B2 (en) * | 2008-02-06 | 2011-11-24 | Daikin Industries, Ltd. | Refrigeration apparatus |
| CN110411054A (en) * | 2019-07-09 | 2019-11-05 | 南京天加环境科技有限公司 | A kind of combustion-gas thermal pump air-conditioning system reducing lubricating oil temperature and control method |
| CN110411054B (en) * | 2019-07-09 | 2021-02-02 | 南京天加环境科技有限公司 | Gas heat pump air conditioning system capable of reducing temperature of lubricating oil and control method |
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