EP1914493A2 - Appareil de climatisation d'air - Google Patents

Appareil de climatisation d'air Download PDF

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Publication number
EP1914493A2
EP1914493A2 EP07118087A EP07118087A EP1914493A2 EP 1914493 A2 EP1914493 A2 EP 1914493A2 EP 07118087 A EP07118087 A EP 07118087A EP 07118087 A EP07118087 A EP 07118087A EP 1914493 A2 EP1914493 A2 EP 1914493A2
Authority
EP
European Patent Office
Prior art keywords
refrigerant
oil
pipe
indoor
length
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
EP07118087A
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German (de)
English (en)
Other versions
EP1914493B8 (fr
EP1914493B1 (fr
EP1914493A3 (fr
Inventor
Satoshi Watanabe
Masashi Maeno
Shinichi Isozumi
Keisuke Mitoma
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 Ltd
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Mitsubishi Heavy Industries 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 Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP1914493A2 publication Critical patent/EP1914493A2/fr
Publication of EP1914493A3 publication Critical patent/EP1914493A3/fr
Application granted granted Critical
Publication of EP1914493B1 publication Critical patent/EP1914493B1/fr
Publication of EP1914493B8 publication Critical patent/EP1914493B8/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/01—Geometry problems, e.g. for reducing size
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves

Definitions

  • the oil-recovery operating unit includes a refrigerant-pipe-length detecting unit configured to detect the refrigerant pipe length of each of the indoor units; a refrigerant-pipe-length storing unit configured to store the refrigerant pipe lengths detected by the refrigerant-pipe-length detecting unit; and an oil-recovery control unit configured to change the operation time during the oil-recovery operation on the basis of the refrigerant pipe length of each of the indoor units stored in the refrigerant-pipe-length storing unit.
  • the oil-recovery operating unit includes a refrigerant-pipe-length detecting unit configured to detect the refrigerant pipe length of each indoor unit, a refrigerant-pipe-length storing unit configured to store the refrigerant pipe lengths detected by the refrigerant-pipe-length detecting unit, and an oil-recovery control unit configured to change the operation time during the oil-recovery operation on the basis of the refrigerant pipe length of each of the indoor units stored in the refrigerant-pipe-length storing unit, the lubricant accumulated in the indoor units and the refrigerant circuit can be recovered, even when the refrigerant pipe length of each indoor unit differs, by changing the operation time during the oil-recovery operation on the basis of the refrigerant pipe length of each indoor unit so as to set an appropriate oil-recovery operation time.
  • the oil-recovery control unit may add the refrigerant-pipe lengths of the indoor units and may change the operation completion time during the oil-recovery operation on the basis of the total refrigerant-pipe length.
  • the completion time of the oil-recovery operation can be delayed by an amount of time corresponding to the refrigerant-pipe length difference, and the operation time can be extended.
  • the lubricant accumulated in the indoor units having long refrigerant pipes and the refrigerant circuit can be reliably recovered.
  • defective lubrication caused by lack of lubricant in the compressor can be reliably prevented.
  • the oil-recovery control unit may determine the refrigerant-pipe length differences among each of the indoor units and may change the operation start time during the oil-recovery operation on the basis of the refrigerant-pipe length differences.
  • the oil-recovery operation is started from the indoor unit having the longest refrigerant pipe so that the longer the refrigerant pipe of the indoor unit is, the greater the degree of opening is.
  • the lubricant accumulated in the indoor units having long refrigerant pipes and the refrigerant circuit can be reliably recovered.
  • defective lubrication caused by lack of lubricant in the compressor can be reliably prevented.
  • An air-conditioning apparatus includes an outdoor unit including a compressor and an outdoor heat-exchanger; a plurality of indoor units connected in parallel with each other, each of the indoor units including an indoor heat-exchanger and an indoor expansion valve; a refrigerant circuit formed by connecting, in order, the compressor, the outdoor heat-exchangers, the plurality of indoor heat-exchangers, and the indoor expansion valves using refrigerant pipes; and an oil-recovery operating unit configured to carry out a liquid return operation at each indoor unit at a predetermined timing, to carry out an oil-recovery operation for recovering lubricant accumulated in the refrigerant circuit, and to complete the oil-recovery operation when liquid return is detected at the outdoor unit.
  • the oil-recovery operating unit includes a refrigerant-pipe-length detecting unit configured to detect the refrigerant pipe length of each of the indoor units; a refrigerant-pipe-length storing unit configured to store the refrigerant pipe lengths detected by the refrigerant-pipe-length detecting unit; and an oil-recovery control unit configured to change the degree of opening of each indoor expansion valve during the oil-recovery operation on the basis of the refrigerant pipe length of each of the indoor units stored in the refrigerant-pipe-length storing unit.
  • the oil-recovery operating unit includes a refrigerant-pipe-length detecting unit configured to detect the refrigerant pipe length of each indoor unit, a refrigerant-pipe-length storing unit configured to store the refrigerant pipe lengths detected by the refrigerant-pipe-length detecting unit, and an oil-recovery control unit configured to change the degree of opening of each indoor expansion valve during the oil-recovery operation on the basis of the refrigerant pipe length of each of the indoor units stored in the refrigerant-pipe-length storing unit, the lubricant accumulated in the indoor units and the refrigerant circuit can be recovered, even when the refrigerant pipe length of each indoor unit differs, by changing the degree of opening of each indoor expansion valve during the oil-recovery operation on the basis of the refrigerant pipe length of each indoor unit so as to make an appropriate amount of refrigerant flow through each indoor unit.
  • the lubricant accumulated in the indoor units having long refrigerant pipes and the refrigerant circuit can be reliably recovered to the compressor.
  • a predetermined amount of lubricant can be constantly retained in the compressor, reliably preventing defective lubrication caused by lack of lubricant in the compressor due to a large amount of lubricant being discharged to the refrigerant circuit.
  • the oil-recovery control unit may determine the refrigerant-pipe length differences among each of the indoor units and may set the degree of opening of the indoor expansion valve so that the longer the refrigerant pipe of the indoor unit is, the greater the degree of opening is.
  • the refrigerant-pipe length differences among each of the indoor units are determined and the degrees of opening of the indoor expansion valves are set so that the longer the refrigerant pipe of the indoor unit is, the greater the degree of opening is, and the longer the refrigerant pipe of the indoor unit, the greater the amount of refrigerant to be discharged.
  • liquid return can be actively carried out so as to recover the lubricant.
  • the lubricant accumulated in the indoor units having long refrigerant pipes and the refrigerant circuit can be reliably recovered.
  • defective lubrication caused by lack of lubricant in the compressor can be reliably prevented.
  • Fig. 1 illustrates a refrigerant circuit of an air-conditioning apparatus according to a first embodiment of the present invention.
  • Fig. 2 is a control flowchart of an oil-recovery control unit of the air-conditioning apparatus according to the first embodiment of the present invention.
  • Figs. 3A and 3B are control flowcharts of an oil-recovery control unit of an air-conditioning apparatus according to a second embodiment of the present invention.
  • Fig. 1 illustrates a refrigerant circuit of a multi-unit air-conditioning apparatus 1 according to the first embodiment of the present invention.
  • the air-conditioning apparatus 1 includes one outdoor unit 2 and a plurality of indoor units 3A, 3B, and 3C that are connected in parallel to the outdoor unit 2.
  • the three indoor units 3A, 3B, and 3C are connected.
  • the number of indoor units 3A, 3B, and 3C to be connected is not limited thereto.
  • the outdoor unit 2 includes an inverter-driven compressor 4 configured to compress a refrigerant, a four-way diverter valve 5 configured to switch the circulation direction of the refrigerant, an outdoor heat-exchanger 6 configured to carry out heat exchange between the refrigerant and outdoor air, an outdoor electronic expansion valve 7 for heating, a receiver 8 configured to retain a liquid refrigerant, a supercooling heat-exchanger 9 configured to supercool the liquid refrigerant, and an accumulator 10 configured to supply the compressor 4 only with a gas refrigerant by separating the liquid component in the refrigerant gas.
  • These components are connected by a known refrigerant pipe 11 to configure a refrigerant circuit 12 for the outdoor unit 2.
  • a gas-side control valve 14 and a liquid-side control valve 15 are provided in the outdoor unit 2.
  • a gas pipe 16 and a liquid pipe 17 that extend to the indoor units 3A, 3B, and 3C are connected via the gas-side control valve 14 and the liquid-side control valve 15.
  • the plurality of indoor units 3A, 3B, and 3C are connected in series to the gas pipe 16 and the liquid pipe 17 via a branching unit and indoor refrigerant pipes 18A, 18B, and 18C, which are not shown in the drawing.
  • the air-conditioning apparatus 1 includes an oil-recovery operating unit 22 configured to carry out liquid return operation of the indoor units 3A, 3B, and 3C at a predetermined timing, for example, after the elapse of predetermined operation times so as to carry out an oil-recovery operation for recovering the lubricant accumulated in the gas side of the refrigerant circuit 21 and to complete the oil-recovery operation when a return of liquid refrigerant is detected at the outdoor unit 2.
  • the timing for carrying out the oil-recovery operation is not limited thereto and may be carried out at other timings, such as when the cumulative flow amount of the lubricant, calculated on the basis of a predetermined formula, reaches a predetermined limit flow amount.
  • the indoor electronic expansion valves 20 of the indoor units 3A, 3B, and 3C can be set at predetermined degrees of opening for the oil-recovery operation. Whether or not liquid refrigerant is returning to the outdoor unit 2 during oil-recovery operation can be detected by determining the degree of superheating of the suction refrigerant from values detected by a low-pressure sensor 23 and an intake-refrigerant temperature sensor 24 that are provided on the refrigerant pipe 11 on the inlet side of the accumulator 10.
  • the pressure loss of a low-pressure gas pipe i.e., indoor refrigerant pipe 18A, 18B, and 18C and the gas pipe 16
  • the suction pressure of the compressor 4 detected by the low-pressure sensor 23
  • the saturation pressure of the indoor refrigerant pipe 18A, 18B, or 18C calculated from the refrigerant temperature detected by heat-exchanger temperature sensors 25 provided on the indoor refrigerant pipes 18A, 18B, and 18C
  • the refrigerant pipe length may be calculated on the basis of the amount of time required for the temperature of the gas discharged from the compressor to reach a predetermined temperature after the degree of opening of the expansion valve is forcefully changed after the cooling operation is stabilized.
  • An oil-recovery control unit 28 that changes the amount of time for carrying out the oil-recovery operation on the basis of the length of each indoor refrigerant pipe 18A, 18B, or 18C (actually the length of the low-pressure gas pipe including the length of the gas pipe 16) of each indoor unit 3A, 3B, or 3C stored in the refrigerant-pipe-length storage unit 27 when the oil-recovery operation is carried out at the above-described timing is provided in the oil-recovery operating unit 22.
  • the oil-recovery control unit 28 controls the oil-recovery operation time in accordance with the control flow illustrated in Fig. 2.
  • the oil-recovery control unit 28 first, it is determined, on the basis of the detection result of the refrigerant pipe length, whether the difference between the refrigerant pipe length (Lmax) of the indoor refrigerant pipe 18A connected to the furthest indoor unit 3A and the refrigerant pipe length (Lmin) of the indoor refrigerant pipe 18C connected to the closest indoor unit 3C is greater than a set pipe length difference Llim (for example, 40 m) (S1). If the refrigerant-pipe length difference is smaller than the set pipe length difference Llim, the process proceeds to normal control, and the above-described oil-recovery operation is carried out.
  • Llim set pipe length difference
  • the oil-recovery operation is completed after the elapse of an oil-recovery operation time Tk (for example, after 30 seconds) set on the basis of the refrigerant pipe length.
  • Tk oil-recovery operation time
  • Llim set pipe length difference
  • the oil-recovery operation completion time is determined by how much time the oil-recovery operation completion time is to be delayed on the basis of the refrigerant-pipe length difference (Lmax - Lmin) (S3). If the refrigerant-pipe length difference (Lmax - Lmin) is within a set range (for example, 40 m ⁇ Lmax - Lmin ⁇ 60 m), the operation completion time is delayed from the set completion time by, for example, 30 seconds, and the oil-recovery operation time is extended by 30 seconds (S4).
  • a set range for example, 40 m ⁇ Lmax - Lmin ⁇ 60 m
  • the operation completion time is delayed from the set completion time by, for example, 60 seconds, and the oil-recovery operation time is extended by 60 seconds (S5).
  • the operation completion condition changed in the above-described manner is stored in the oil-recovery operating unit 22, which controls the outdoor unit 2 (S6). Then, the control is switched to normal control so as to carry out the above-described oil-recovery operation.
  • a liquid return operation is carried out in a cooling cycle while the indoor electronic expansion valves 20 of the indoor units 3A, 3B, and 3C are set at a predetermined degree of opening for the oil-recovery operation so as to return the liquid refrigerant to the outdoor unit 2.
  • the lubricant accumulated in the indoor units 3A, 3B, and 3C and the indoor refrigerant pipes 18A, 18B, and 18C is flushed with the refrigerant flow and is recovered to the compressor 4.
  • the liquid return is detected and the oil-recovery operation is completed.
  • Whether or not the liquid refrigerant has returned to the outdoor unit 2 can be determined by calculating the degree of superheating of the suction refrigerant from values detected by the low-pressure sensor 23 and the intake-refrigerant temperature sensor 24 provided on the refrigerant pipe 11 on the inlet side of the accumulator 10.
  • the oil-recovery operation is completed a predetermined amount of time (30 seconds according to this embodiment) after the liquid return to the outdoor unit 2 is detected.
  • the refrigerant-pipe length difference (Lmax - Lmin) of the indoor units 3A, 3B, and 3C detected in advance by the refrigerant-pipe-length detecting unit 26 and stored in the refrigerant-pipe-length storage unit 27 is compared with the set pipe length difference Llim (for example, 40 m) (S1 in Fig. 2). If the refrigerant-pipe length difference (Lmax - Lmin) is less than 40 m, as described above, the oil-recovery operation is completed 30 seconds after liquid return is detected. If the refrigerant-pipe length difference (Lmax - Lmin) is equal to or greater than 40 m, the completion condition of the oil-recovery operation is changed.
  • Llim for example, 40 m
  • the completion condition of the oil-recovery operation is set such that, when the refrigerant-pipe length difference is between 40 and 60 m, the oil-recovery operation time is extended by 30 seconds (S4 in Fig. 2), and the oil-recovery operation is completed 60 seconds after liquid return is detected at the outdoor unit 2.
  • the oil-recovery operation time is extended by 60 seconds (S5 in Fig.
  • the oil-recovery operation time can be changed on the basis of the refrigerant pipe length of each indoor unit 3A, 3B, or 3C so as to set an appropriate oil-recovery operation time corresponding to the indoor unit 3A that has the largest refrigerant pipe length. Therefore, the lubricant accumulated in the indoor units 3A, 3B, and 3C and their refrigerant circuits can be reliably collected.
  • the refrigerant-pipe length difference of the indoor units 3A, 3B, and 3C is determined, and the completion time of the oil-recovery operation can be changed on the basis of the determined refrigerant-pipe length difference. Therefore, when it is determined that the refrigerant-pipe length difference is large, the completion time of the oil-recovery operation can be delayed by an amount of time corresponding to the refrigerant-pipe length difference, and the oil-recovery operation time can be extended. In this way, the lubricant accumulated in the indoor unit 3A having the largest refrigerant pipe length and the indoor refrigerant pipe 18A can be reliably recovered to the compressor 4.
  • a predetermined amount of lubricant can be constantly retained in the compressor 4, reliably preventing defective lubrication caused by lack of lubricant in the compressor 4 due to a large amount of lubricant being discharged to the refrigerant circuit 21.
  • the oil-recovery operation time is changed in two steps. However, it may be changed in three steps or may be changed continuously.
  • the oil-recovery operation time is changed on the basis of the refrigerant-pipe length difference of the indoor units 3A, 3B, and 3C.
  • the process of changing the oil-recovery operation time is not limited thereto, and various modifications, as described below, may be employed.
  • the operation time changed during the oil-recovery operation is not limited to that described above, and may be set appropriately.
  • the oil-recovery operation is a liquid return operation, it is desirable to limit the maximum operation time by taking into consideration the volume of the accumulator 10.
  • the corresponding indoor electronic expansion valve 20 of the indoor unit is determined to be, for example, +40 pulses with respect to the set degree of opening, i.e., is determined to have a degree of opening 40 pulses greater than the set degree of opening (S17).
  • the indoor electronic expansion valve 20 of the corresponding indoor unit is determined to be, for example, +20 pulses with respect to the set degree of opening, i.e., is determined to have a degree of opening 20 pulses greater than the set degree of opening (S18).
  • the corresponding indoor electronic expansion valve 20 of the indoor unit is determined to be, for example, -20 pulses with respect to the set degree of opening, i.e., is determined to have a degree of opening 20 pulses smaller than the set degree of opening (S19).
  • the indoor electronic expansion valve 20 of the corresponding indoor unit is determined to be, for example, -40 pulses with respect to the set degree of opening, i.e., is determined to have a degree of opening 40 pulses smaller than the set degree of opening (S20).
  • the liquid return operation can be carried out by discharging an appropriate amount of refrigerant corresponding to the refrigerant pipe length of each of the indoor units 3A, 3B, and 3C, and the lubricant accumulated in the indoor units 3A, 3B, and 3C and the indoor refrigerant pipes 18A, 18B, and 18C can be recovered. Therefore, the lubricant retained in the indoor unit 3A having a great refrigerant pipe length and its indoor refrigerant pipe 18A can be reliably recovered to the compressor 4.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
EP20070118087 2006-10-11 2007-10-09 Appareil de climatisation d'air Expired - Fee Related EP1914493B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006277481A JP5259944B2 (ja) 2006-10-11 2006-10-11 空気調和装置

Publications (4)

Publication Number Publication Date
EP1914493A2 true EP1914493A2 (fr) 2008-04-23
EP1914493A3 EP1914493A3 (fr) 2011-06-08
EP1914493B1 EP1914493B1 (fr) 2012-07-11
EP1914493B8 EP1914493B8 (fr) 2012-09-26

Family

ID=38951720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070118087 Expired - Fee Related EP1914493B8 (fr) 2006-10-11 2007-10-09 Appareil de climatisation d'air

Country Status (4)

Country Link
EP (1) EP1914493B8 (fr)
JP (1) JP5259944B2 (fr)
CN (1) CN101162104B (fr)
ES (1) ES2390485T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
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JP2015094561A (ja) * 2013-11-13 2015-05-18 三菱重工業株式会社 冷暖フリーマルチ形空気調和機の冷媒配管洗浄方法
EP3333508A4 (fr) * 2015-08-03 2019-04-17 Daikin Industries, Ltd. Dispositif de détermination
CN111102772A (zh) * 2019-10-23 2020-05-05 珠海格力电器股份有限公司 低温连续制热的回油系统、回油控制方法及空调设备
EP3643979A4 (fr) * 2017-06-23 2020-07-15 Mitsubishi Electric Corporation Dispositif à cycle frigorifique
EP3546851A4 (fr) * 2016-11-24 2020-08-19 Daikin Industries, Ltd. Dispositif de réfrigération

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JP4902723B2 (ja) * 2009-11-12 2012-03-21 三菱電機株式会社 凝縮圧力検知システム及び冷凍サイクルシステム
JP5773711B2 (ja) * 2011-04-01 2015-09-02 三菱電機株式会社 冷凍機
JP2013044512A (ja) * 2011-08-26 2013-03-04 Yanmar Co Ltd 空調システム
CN103162385B (zh) * 2013-04-02 2016-01-13 四川长虹电器股份有限公司 一种调整制冷设备电子膨胀阀的装置及方法
KR102073011B1 (ko) 2013-12-18 2020-03-02 삼성전자주식회사 오일 검출 장치, 그를 가지는 압축기 및 압축기의 제어 방법
CN108885028B (zh) * 2016-04-18 2020-07-17 三菱电机株式会社 制冷循环装置
WO2020066016A1 (fr) * 2018-09-28 2020-04-02 三菱電機株式会社 Climatiseur
CN109539407A (zh) * 2018-11-19 2019-03-29 珠海格力电器股份有限公司 多联机系统及其控制方法
EP3933296A4 (fr) * 2019-02-28 2022-03-02 Mitsubishi Electric Corporation Dispositif à cycle frigorifique
CN109855229A (zh) * 2019-03-01 2019-06-07 珠海格力电器股份有限公司 分段回油的回油控制方法及多联机系统
CN110986257B (zh) * 2019-12-17 2023-05-26 珠海格力电器股份有限公司 一种多联机系统清洗方法、装置及空调设备
CN114061056B (zh) * 2020-07-28 2023-05-30 广东美的制冷设备有限公司 空调器控制方法、空调器及计算机可读存储介质
CN112361537B (zh) * 2020-11-23 2021-10-15 珠海格力电器股份有限公司 多联机系统及其回油控制方法、装置、存储介质及处理器
CN113108445B (zh) * 2021-04-26 2023-04-21 广东美的暖通设备有限公司 多联机空调系统的回油控制方法及装置
CN113324287A (zh) * 2021-05-21 2021-08-31 广东美的暖通设备有限公司 室内机与室外机连接管长度的识别方法、装置及空调系统
CN113280533B (zh) * 2021-06-10 2022-04-19 宁波奥克斯电气股份有限公司 一种多联空调压缩机回油方法
CN113639390B (zh) * 2021-07-16 2022-12-27 青岛海尔空调电子有限公司 空调压缩机的控制方法和系统

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JPH10288410A (ja) * 1997-04-14 1998-10-27 Daikin Ind Ltd 冷凍装置
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CN111102772A (zh) * 2019-10-23 2020-05-05 珠海格力电器股份有限公司 低温连续制热的回油系统、回油控制方法及空调设备
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JP5259944B2 (ja) 2013-08-07
EP1914493B8 (fr) 2012-09-26
CN101162104A (zh) 2008-04-16
CN101162104B (zh) 2010-08-25
ES2390485T3 (es) 2012-11-13
EP1914493B1 (fr) 2012-07-11
EP1914493A3 (fr) 2011-06-08

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