JPS63286664A - Heat pump type air conditioner - Google Patents
Heat pump type air conditionerInfo
- Publication number
- JPS63286664A JPS63286664A JP12050287A JP12050287A JPS63286664A JP S63286664 A JPS63286664 A JP S63286664A JP 12050287 A JP12050287 A JP 12050287A JP 12050287 A JP12050287 A JP 12050287A JP S63286664 A JPS63286664 A JP S63286664A
- Authority
- JP
- Japan
- Prior art keywords
- electric expansion
- expansion valve
- temperature
- heat exchanger
- indoor
- 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
- 239000003507 refrigerant Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 description 12
- 238000001816 cooling Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000006866 deterioration Effects 0.000 description 3
- 239000010721 machine oil Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、冷媒流量制御装置として、電動膨張弁を採用
し、室内外の空気温度が上昇してくる、暖房過負荷時の
吐出圧力・吐出温度の増大を制御する機能を備えたヒー
トポンプ式空気調和機に関する。[Detailed Description of the Invention] Industrial Application Field The present invention employs an electric expansion valve as a refrigerant flow rate control device to control the discharge pressure and discharge temperature during heating overload when indoor and outdoor air temperatures rise. The present invention relates to a heat pump type air conditioner that has a function of controlling an increase in heat.
従来の技術
近年、ヒートポンプ式空気調和機は、運転状態に合った
最適な冷媒流量を決定するために、冷凍サイクルの冷媒
制御装置として、電動膨張弁が採用されている。BACKGROUND OF THE INVENTION In recent years, heat pump air conditioners have adopted an electric expansion valve as a refrigerant control device for a refrigeration cycle in order to determine the optimal refrigerant flow rate suited to operating conditions.
以下図面を参照しながら従来のヒートポンプ式空気調和
機の冷媒制御装置の一例について説明する。第４図は、
冷媒制御装置として、電動膨張弁を用いた従来のヒート
ポンプ式空気調和機の冷却システム図を示すものである
。第４図において、１は空調負荷及び運転条件に応じて
、能力が可変出来る圧縮機、３は冷暖房サイクルを切換
える四方弁４は室外熱交換器、５は室外の電動膨張弁、
７は室内の電動膨張弁、８は室内熱交換器、１゜はアキ
ュムレータであり、これらを環状に接続して冷凍サイク
ルを構成している。１１は電磁弁、１２はキャピラリチ
ューブで、四方弁３．アキュムレータ１０を結ぶ配管と
、室外熱交換器４と電動膨張弁７を結ぶ配管を接続して
いる。２は高圧圧力開閉器で吐出圧力が一定値以上にな
ると電磁弁１１を開き、液冷媒の一部を液バイパス回路
へ流し、吐出温度及び吐出圧力の上昇を防ぐ。１３ば、
暖房運転時に室外熱交換器の中間部の配管温度センサー
２ｏと出口部の配管温度センサー２１が検知する差温に
基づいて電動膨張弁６の開度変更動作を出力する制御器
である。９は冷房運転時に室内熱交換器８の中間部の配
管温度センサー２２と出口部の配管温度センサー２３が
検出する差温に基づいて電動膨張弁７の開度変更動作を
出力する制（財）器である。An example of a conventional refrigerant control device for a heat pump air conditioner will be described below with reference to the drawings. Figure 4 shows
This figure shows a cooling system diagram of a conventional heat pump air conditioner that uses an electric expansion valve as a refrigerant control device. In Fig. 4, 1 is a compressor whose capacity can be varied according to the air conditioning load and operating conditions, 3 is a four-way valve that switches between air conditioning and heating cycles, 4 is an outdoor heat exchanger, 5 is an outdoor electric expansion valve,
7 is an indoor electric expansion valve, 8 is an indoor heat exchanger, and 1° is an accumulator, which are connected in a ring to form a refrigeration cycle. 11 is a solenoid valve, 12 is a capillary tube, and 3. is a four-way valve. A pipe connecting the accumulator 10 and a pipe connecting the outdoor heat exchanger 4 and the electric expansion valve 7 are connected. Reference numeral 2 denotes a high-pressure switch which opens a solenoid valve 11 when the discharge pressure exceeds a certain value, allowing a portion of the liquid refrigerant to flow into the liquid bypass circuit, thereby preventing increases in discharge temperature and discharge pressure. 13th ba,
This is a controller that outputs an operation to change the opening degree of the electric expansion valve 6 based on the temperature difference detected by the pipe temperature sensor 2o at the intermediate part of the outdoor heat exchanger and the pipe temperature sensor 21 at the outlet part during heating operation. Reference numeral 9 refers to a system that outputs an operation to change the opening of the electric expansion valve 7 based on the temperature difference detected by the pipe temperature sensor 22 at the intermediate part of the indoor heat exchanger 8 and the pipe temperature sensor 23 at the outlet part during cooling operation. It is a vessel.
以上のように構成された空気調和機について、以下その
動作について説明する。The operation of the air conditioner configured as above will be described below.
まず冷房時について説明する。冷房時は圧縮機１で圧縮
された高温・高圧の冷媒ガスは四方弁３を通り、室外熱
交換器４で液化する。冷房時、電動膨張弁６は、全開と
し、ここでは、絞りを与えないだめ、室内機には、高圧
液冷媒が入る。さらに室内機の電動膨張弁７にて断熱膨
張して低温低圧の気液二相の冷媒となシ、室内熱交換器
８で蒸発ガス化してアキュムレーター１０に至り、圧縮
機１に戻るサイクルを繰り返す。First, the cooling time will be explained. During cooling, high-temperature, high-pressure refrigerant gas compressed by the compressor 1 passes through the four-way valve 3 and is liquefied in the outdoor heat exchanger 4. During cooling, the electric expansion valve 6 is fully opened, and high-pressure liquid refrigerant enters the indoor unit without throttling. The electric expansion valve 7 of the indoor unit further adiabatically expands the refrigerant into a low-temperature, low-pressure gas-liquid two-phase refrigerant, which is then evaporated and gasified in the indoor heat exchanger 8 to reach the accumulator 10 and return to the compressor 1. repeat.
次に電動膨張弁子による冷媒流量制御方法について第６
図を参照しながら説明する。室内熱交換器８の中間部と
出口部に設けられた温度センサー２２．２３から差温計
測手段９ｄによシ差温を求め、その差温に基づき電動膨
張弁開度決定手段９ｂにより弁開度を決定し、それに基
づき、電動膨張弁制御手段９Ｃにて電動膨張弁７を制御
し、弁開度を調節・設定・制御する。Next, we will discuss the refrigerant flow rate control method using an electric expansion valve in the sixth section.
This will be explained with reference to the figures. The temperature difference measuring means 9d determines the temperature difference from the temperature sensors 22, 23 provided at the intermediate part and the outlet part of the indoor heat exchanger 8, and based on the temperature difference, the electric expansion valve opening degree determining means 9b opens the valve. Based on the determination, the electric expansion valve control means 9C controls the electric expansion valve 7 to adjust, set, and control the valve opening degree.
次に暖房時について説明する。暖房時は圧縮機１で圧縮
された高温・高圧の冷媒ガスは四方弁３を通シ、室内熱
交換器８で液化する。暖房時、電動膨張弁７は全開とし
、室外機には、高圧液冷媒が入る。更に室外機側の電動
膨張弁５にて断熱膨張して低温低圧の気液二相の冷媒と
なり室外熱交換器４で蒸発ガス化してアキュムレータ１
０に至シ、圧縮機１に戻るサイクルを繰）返す。Next, heating will be explained. During heating, high-temperature, high-pressure refrigerant gas compressed by the compressor 1 passes through the four-way valve 3 and is liquefied in the indoor heat exchanger 8. During heating, the electric expansion valve 7 is fully opened, and high-pressure liquid refrigerant enters the outdoor unit. Furthermore, it undergoes adiabatic expansion in the electric expansion valve 5 on the outdoor unit side, becomes a low-temperature, low-pressure, gas-liquid two-phase refrigerant, and is evaporated and gasified in the outdoor heat exchanger 4 to the accumulator 1.
The cycle of reaching 0 and returning to compressor 1 is repeated.
次に電動膨張弁６による冷媒流量制御方法について説明
する。Next, a method of controlling the refrigerant flow rate using the electric expansion valve 6 will be explained.
室外熱交換器４の中間部と出口部の配管温度を温度セン
サー２０．２１によって検知することによシ、その差温
に応じて、室内機の制御器９と同様の制御を行ない、電
動膨張弁６を制御する。By detecting the temperature of the piping between the intermediate section and the outlet section of the outdoor heat exchanger 4 with the temperature sensor 20.21, the same control as the controller 9 of the indoor unit is performed according to the difference in temperature, and electric expansion is performed. Control valve 6.
次に暖房過負荷時について説明する。暖房運転時には室
内外の空気温度が上昇してくると吐出温度。Next, the case of heating overload will be explained. During heating operation, when the indoor and outdoor air temperature rises, the discharge temperature will increase.
吐出圧力がそれにともなって上昇し、運転不可能という
結果が生じるため、吐出圧力が一定値以上にあると高圧
圧力開閉器２の働きで、電磁弁１１を開き液冷媒の一部
を液バイパス回路へ逃がすことで、吐出圧力を下げると
同時に、圧縮機吸入側のガスを冷やし、吐出温度・吐出
圧力の上昇を防ぐ。なお吐出圧力が一定値以下に下がる
と、電磁弁１１を閉じ、元の標準時の運転に戻る。The discharge pressure increases accordingly, resulting in the inability to operate. Therefore, when the discharge pressure exceeds a certain value, the high pressure switch 2 operates to open the solenoid valve 11 to divert a portion of the liquid refrigerant to the liquid bypass circuit. This reduces the discharge pressure and at the same time cools the gas on the suction side of the compressor, preventing increases in discharge temperature and pressure. Note that when the discharge pressure falls below a certain value, the solenoid valve 11 is closed and the operation returns to the original standard operation.
発明が解決しようとする問題点
しかしながら上記のような構成では、暖房過負荷時に少
量の液冷媒を直接吸入側に戻すため、戻しだ液冷媒分だ
け能力が低下するうえに、液バイパス回路用に電磁弁及
びキャピラリーを設置しなければならず、コストが高く
つくという問題点も有していた。Problems to be Solved by the Invention However, with the above configuration, a small amount of liquid refrigerant is directly returned to the suction side during heating overload, so the capacity is reduced by the amount of returned liquid refrigerant, and the liquid refrigerant is not used for the liquid bypass circuit. Another problem was that a solenoid valve and a capillary had to be installed, resulting in high costs.
本発明は上記問題点に鑑み、暖房過負荷時に電動膨張弁
のみを有効に使うことにより、吐出温度・吐出圧力の増
大を防ぎ、サイクル状態を安定に保つことができる制御
機能を備えたヒートポンプ式空気調和機を提供するもの
である。In view of the above-mentioned problems, the present invention is a heat pump type with a control function that prevents an increase in discharge temperature and discharge pressure and maintains a stable cycle state by effectively using only an electric expansion valve during heating overload. It provides air conditioners.
問題点を解決するだめの手段
上記問題点を解決するために本発明のヒートポンプ式空
気調和機は、通常はエバポレーター側の中間部の配管温
度と出口部の配管温度を演算して電動膨張弁室内外の空
気温度が上昇してくる暖房過負荷時には、吐出温度また
は吐出圧力または室内外の空気温度を検知して、電動膨
張弁の開度を決定するという構成を備えたものである。Means for Solving the Problems In order to solve the above problems, the heat pump type air conditioner of the present invention normally calculates the pipe temperature at the intermediate section on the evaporator side and the pipe temperature at the outlet section, and then calculates the temperature inside the electric expansion valve. In the event of a heating overload in which the outside air temperature rises, the opening of the electric expansion valve is determined by detecting the discharge temperature or pressure or the indoor and outdoor air temperature.
作 用
本発明は上記した構成によって、通常はエバポレーター
側の中間部の配管温度と出口部の配算温度の差温を演算
して室内外の空気温度が上昇してくる暖房過負荷時には
、吐出温度または、吐出圧力または、室内外の空気温度
を検知して電動膨張弁の開度を決定するため、通常運転
時に比べて、開度が大きくなりそれとともに冷媒流量も
増加し、室外熱交換器での放熱量が小さくなるので、圧
縮置板入側を冷却することが出来、吐出温度・吐出圧力
の上昇を抑えることになる。Function: With the above-described configuration, the present invention normally calculates the difference between the piping temperature at the intermediate section on the evaporator side and the calculated temperature at the outlet section, and then adjusts the discharge during heating overload when the indoor and outdoor air temperatures rise. Since the opening degree of the electric expansion valve is determined by detecting temperature, discharge pressure, or indoor/outdoor air temperature, the opening degree becomes larger than during normal operation, and the refrigerant flow rate also increases. Since the amount of heat dissipated at is reduced, the inlet side of the compression plate can be cooled, and increases in discharge temperature and discharge pressure can be suppressed.
実施例
以下本発明の一実施例のヒートポンプ式空気調和機につ
いて、第１図、第２図及び第３図を参照しながら説明す
る。第１図は本発明の実施例におけるヒートポンプ式空
気調和機の冷却システムを示すものであシ、第２図は室
外機の電動膨張弁の制御のブロック図、第３図は、特に
室内外の空気温度が上昇してくる暖房過負荷時の電動膨
張弁の挙動とそれにともなって変化する吐出圧力の関係
を示している。第１図において、１は圧縮機、３は四方
弁、４は室外熱交換器、５．γは電動膨張弁、８は室内
熱交換器、１ｏはアキュムレータで、これらを環状に接
続して冷凍サイクルを構成している。EXAMPLE Hereinafter, a heat pump air conditioner according to an example of the present invention will be described with reference to FIGS. 1, 2, and 3. Fig. 1 shows a cooling system for a heat pump type air conditioner according to an embodiment of the present invention, Fig. 2 is a block diagram of the control of the electric expansion valve of the outdoor unit, and Fig. 3 shows a cooling system for a heat pump air conditioner according to an embodiment of the present invention. This figure shows the relationship between the behavior of the electric expansion valve during heating overload, where the air temperature rises, and the discharge pressure that changes accordingly. In FIG. 1, 1 is a compressor, 3 is a four-way valve, 4 is an outdoor heat exchanger, and 5. γ is an electric expansion valve, 8 is an indoor heat exchanger, and 1o is an accumulator, which are connected in a ring to form a refrigeration cycle.
まず第２図よシ暖房時の室外側の電動膨張弁５の制御に
ついて説明する。通常は室外熱交換器４の中間部と出口
部に設けられた温度センサー２０゜２１から差温計測手
段６ａによシ差温を求め、その差温に基づき電動膨張弁
開度決定手段６Ｃで弁開度を設定し、電動膨張弁６の弁
開度を電動膨張弁制御手段６ｄにて制御する。しかしな
がら、高圧圧力開閉器２より、吐出圧力検知手段らｂが
、吐出圧力の上限値ＰＨを検知した場合、電動膨張弁開
度決定手段６Ｃは、弁開度を全開に設定し、電動膨張弁
制御手段６ｄにて制御する。First, referring to FIG. 2, the control of the electric expansion valve 5 on the outdoor side during heating will be explained. Normally, the temperature difference is determined by the temperature difference measuring means 6a from the temperature sensors 20 and 21 provided at the intermediate part and the outlet part of the outdoor heat exchanger 4, and based on the temperature difference, the electric expansion valve opening degree determining means 6C is used. The valve opening degree is set, and the valve opening degree of the electric expansion valve 6 is controlled by the electric expansion valve control means 6d. However, when the discharge pressure detection means b detects the upper limit value PH of the discharge pressure from the high-pressure pressure switch 2, the electric expansion valve opening degree determination means 6C sets the valve opening degree to fully open, and the electric expansion valve It is controlled by the control means 6d.
冷房時の電動膨張弁制御については、従来と同一である
ので説明は省略する。The electric expansion valve control during cooling is the same as the conventional one, so a description thereof will be omitted.
次に第１図及び第３図によシ、室内外の空気温度が上昇
してくる暖房過負荷時の電動膨張弁制御方法について説
明する。Next, with reference to FIGS. 1 and 3, a description will be given of an electric expansion valve control method during heating overload when the indoor and outdoor air temperatures rise.
暖房時外気温が上昇してくると、吐出温度−吐出圧力が
それにともなって上昇してくる（０〈ｔ＜Ｔ１）。When the outside temperature rises during heating, the ratio of discharge temperature to discharge pressure rises accordingly (0<t<T1).
そして、吐出圧力がＰＨ以上になると高圧圧力開閉器２
が働き、電動膨張弁を全開とすることによって吐出圧力
を下げると同時に冷媒流量を増加させることによって、
室外熱交換器４での放熱量を小さくし、圧縮機吸入側の
ガスを冷やし、吐出温度・吐出圧力の上昇、冷凍機油の
劣化を防ぐ（Ｔ ＜ ｔ ＜Ｔ２ ）。When the discharge pressure exceeds PH, the high pressure switch 2
works, by fully opening the electric expansion valve to lower the discharge pressure and at the same time increase the refrigerant flow rate.
The amount of heat released by the outdoor heat exchanger 4 is reduced to cool the gas on the suction side of the compressor, thereby preventing increases in discharge temperature and discharge pressure and deterioration of refrigerating machine oil (T < t < T2).
なお、吐出圧力がＰ２以下になると電動膨張弁６を従来
のエバポレーターの中間部の配管温度と出口部の配管温
度の差温を演算することによって、開度を制御するとい
う手法に切り換える（Ｔ２〈ｔ）。Note that when the discharge pressure becomes lower than P2, the electric expansion valve 6 is switched to a conventional method in which the opening degree is controlled by calculating the difference in temperature between the pipe temperature at the middle part of the evaporator and the pipe temperature at the outlet part (T2 t).
なお本実施例では、室内外の空気温度が上昇してくる暖
房過負荷時の電動膨張弁開度制御を、吐出圧力を検知す
ることによって行なっているが、吐出温度及び室内外の
空気温度を検知してもよい。In this example, the opening degree of the electric expansion valve is controlled by detecting the discharge pressure during heating overload when the indoor and outdoor air temperatures rise. May be detected.
このように暖房過負荷時に吐出圧力が設定値以上まで上
昇してくると高圧圧力開閉器によって電動膨張弁の全開
とすることによシ、吐出圧力を下げると同時に、圧縮機
吸入側のガスを冷やし、吐出温度を下げ、冷凍機油の劣
化も防ぐことができる。In this way, when the discharge pressure rises above the set value during heating overload, the electric expansion valve is fully opened by the high-pressure switch, thereby lowering the discharge pressure and at the same time reducing the gas on the suction side of the compressor. It is possible to cool down, lower the discharge temperature, and prevent deterioration of refrigerating machine oil.
発明の効果
以上のように本発明は、室内外の空気温度が上昇してく
る暖房過負荷時には、吐出温度・吐出圧力または外気温
を検知して、電動膨張弁の開度を決定するという制御手
段を備えることにより、吐出温度・吐出圧力の増大及び
冷凍機油の劣化を防ぐことかできる。Effects of the Invention As described above, the present invention provides control in which the opening degree of the electric expansion valve is determined by detecting the discharge temperature, discharge pressure, or outside temperature during heating overload when the indoor and outdoor air temperatures rise. By providing the means, it is possible to prevent increases in discharge temperature and discharge pressure and deterioration of refrigerating machine oil.
第１図は本発明の一実施例におけるヒートポンプ式空気
調和機の冷却システム図、第２図は同制御器のブロック
図、第３図は同暖房過負荷時の電動膨張弁制御と吐出圧
力の関係を示す図、第４図は従来のヒートポンプ式空気
調和機の冷却システム図、第６図は同制御器のブロック
図である。
１・・・・・・圧縮機、４・・・・・・室外熱交換器、
６・・・・・・電動膨張弁、６・・・・・・制御器、８
・・・・・・室内熱交換器。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名１−
圧縮機
４−・ 室外珠父撲５
５− 電り彫県弁
６− 判 ＠ 嘉
第１図
第 ４ 図
第５図
ｔｒ膨張弁閘度（喘） 吐セ庄カＰＯＮ Ｃ）１〜
ｊ Ｉ＋Fig. 1 is a diagram of the cooling system of a heat pump air conditioner according to an embodiment of the present invention, Fig. 2 is a block diagram of the controller, and Fig. 3 is a diagram of electric expansion valve control and discharge pressure during heating overload. 4 is a diagram showing the cooling system of a conventional heat pump type air conditioner, and FIG. 6 is a block diagram of the controller. 1...Compressor, 4...Outdoor heat exchanger,
6...Electric expansion valve, 6...Controller, 8
...Indoor heat exchanger. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
Compressor 4-・Outdoor pump 5 5-Electric carving prefecture valve 6- Size @KaFigure 1Figure 4Figure 5Tr expansion valve tightness (gasp) Discharge valve PON C) 1 ~ j I+
Claims (1)
て構成される冷媒回路中に、室内熱交換器と室外熱交換
器との間に電動膨張弁を設け、かつ暖房過負荷時には吐
出温度または吐出圧力または室内外の空気温度を検知し
て、電動膨張弁の開度を決定する制御手段を備えたこと
を特徴とするヒートポンプ式空気調和機。A refrigerant circuit consisting of a compressor, an indoor heat exchanger, an outdoor heat exchanger, etc. connected in a ring is provided with an electric expansion valve between the indoor heat exchanger and the outdoor heat exchanger, and a heating overload is provided. A heat pump type air conditioner characterized by comprising a control means that sometimes detects discharge temperature or pressure or indoor and outdoor air temperature to determine the opening degree of an electric expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12050287A JPS63286664A (en) | 1987-05-18 | 1987-05-18 | Heat pump type air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12050287A JPS63286664A (en) | 1987-05-18 | 1987-05-18 | Heat pump type air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63286664A true JPS63286664A (en) | 1988-11-24 |
Family
ID=14787785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12050287A Pending JPS63286664A (en) | 1987-05-18 | 1987-05-18 | Heat pump type air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63286664A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03134436A (en) * | 1989-10-16 | 1991-06-07 | Daikin Ind Ltd | Operation control device in freezer device |
| JPH03251661A (en) * | 1990-02-28 | 1991-11-11 | Daikin Ind Ltd | Heat pump system |
| WO2017170538A1 (en) * | 2016-04-01 | 2017-10-05 | ダイキン工業株式会社 | Refrigeration device |
| JP2022020605A (en) * | 2020-07-20 | 2022-02-01 | エルジー エレクトロニクス インコーポレイティド | Multi-air conditioner for cooling and heating |
-
1987
- 1987-05-18 JP JP12050287A patent/JPS63286664A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03134436A (en) * | 1989-10-16 | 1991-06-07 | Daikin Ind Ltd | Operation control device in freezer device |
| JPH03251661A (en) * | 1990-02-28 | 1991-11-11 | Daikin Ind Ltd | Heat pump system |
| WO2017170538A1 (en) * | 2016-04-01 | 2017-10-05 | ダイキン工業株式会社 | Refrigeration device |
| JP2017187189A (en) * | 2016-04-01 | 2017-10-12 | ダイキン工業株式会社 | Freezer |
| CN108885029A (en) * | 2016-04-01 | 2018-11-23 | 大金工业株式会社 | Refrigerating plant |
| CN108885029B (en) * | 2016-04-01 | 2019-12-24 | 大金工业株式会社 | Refrigerating device |
| US10794615B2 (en) | 2016-04-01 | 2020-10-06 | Daikin Industries, Ltd. | Refrigeration apparatus |
| US11280525B2 (en) | 2016-04-01 | 2022-03-22 | Daikin Industries, Ltd. | Refrigeration apparatus |
| JP2022020605A (en) * | 2020-07-20 | 2022-02-01 | エルジー エレクトロニクス インコーポレイティド | Multi-air conditioner for cooling and heating |
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