EP4160102A1 - Ölrücklaufsteuerverfahren für multisplitsystem - Google Patents

Ölrücklaufsteuerverfahren für multisplitsystem Download PDF

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Publication number
EP4160102A1
EP4160102A1 EP21800140.2A EP21800140A EP4160102A1 EP 4160102 A1 EP4160102 A1 EP 4160102A1 EP 21800140 A EP21800140 A EP 21800140A EP 4160102 A1 EP4160102 A1 EP 4160102A1
Authority
EP
European Patent Office
Prior art keywords
oil return
opening degree
expansion valve
indoor unit
smax
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
EP21800140.2A
Other languages
English (en)
French (fr)
Other versions
EP4160102A4 (de
EP4160102B1 (de
Inventor
Baitian ZHUO
Bin Shi
Shaojiang CHENG
Ruigang Zhang
Jun Wang
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.)
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co 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 Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioning Electric Co Ltd
Publication of EP4160102A1 publication Critical patent/EP4160102A1/de
Publication of EP4160102A4 publication Critical patent/EP4160102A4/de
Application granted granted Critical
Publication of EP4160102B1 publication Critical patent/EP4160102B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • 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
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel

Definitions

  • the present disclosure belongs to the technical field of air conditioning, and specifically provides an oil return control method for a multi-connection system.
  • a multi-connection system usually consists of a plurality of indoor units and at least one outdoor unit. During the actual operation, some indoor units are in a shutdown or standby state. If an expansion valve of the shutdown or standby indoor unit is closed, a lubricating oil in connecting pipes and heat exchanger of the indoor unit cannot be circulated into the system. As the time elapses, there will be more and more lubricating oil in the indoor unit, causing the compressor to suffer severe wear due to lack of the lubricating oil or causing damage to the compressor due to overheating. In order to ensure a normal operation of the multi-connection system, oil return control is required so that the lubricating oil can be normally circulated into the system.
  • the oil is usually returned according to a fixed cycle.
  • the expansion valve is opened by a fixed opening degree, and the system terminates the oil return after an oil return operation time is reached.
  • the traditional oil return control methods have not fundamentally solved the problem of insufficient lubricating oil in the compressor, and may also cause the problem of poor overall heat exchange performance of the system due to the insufficient amount of refrigerant in the normally turned-on indoor units. That is, the traditional oil return control methods cannot give considerations to both the oil return effect and the heat exchange performance of the system.
  • the present disclosure provides an oil return control method for a multi-connection system.
  • the multi-connection system includes a plurality of indoor units, at least one of which is not turned on, and the oil return control method includes: determining an oil storage quantity q of the indoor units; determining a system oil return time T of the multi-connection system; determining a current opening degree k of an expansion valve of one indoor unit that is not turned on according to the oil storage quantity q and the system oil return time T; comparing the current opening degree k with a maximum opening degree threshold k smax and a minimum opening degree threshold k smin ; selectively adjusting the opening degree of the expansion valve according to a comparison result, and keeping the expansion valve operating at the adjusted opening degree for the system oil return time T.
  • the step of "selectively adjusting the opening degree of the expansion valve according to a comparison result, and keeping the expansion valve operating at the adjusted opening degree for the system oil return time T" specifically includes: keeping the expansion valve operating at the current opening degree k for the system oil return time T if k smin ⁇ k ⁇ k smax , and then returning to the step of determining q.
  • the step of "selectively adjusting the opening degree of the expansion valve according to a comparison result, and keeping the expansion valve operating at the adjusted opening degree for the system oil return time T" specifically includes: adjusting the opening degree of the expansion valve to k smax if k>k smax , keeping the expansion valve operating at the adjusted opening degree for the system oil return time T, and then returning to the step of determining q.
  • the expansion valve before returning to the step of determining q, the expansion valve is kept operating at the adjusted opening degree for an oil return interval time Ti.
  • the step of "keeping the expansion valve operating at the adjusted opening degree for an oil return interval time T i " specifically includes: acquiring a shutdown time t sp of the indoor unit; and judging whether the shutdown time t sp is larger than a maximum shutdown time threshold t spmax ; if yes, it means that the expansion valve has operated at the adjusted opening degree for the oil return interval time Ti.
  • the oil return control method for the multi-connection system includes: determining an oil storage quantity q of the indoor units; determining a system oil return time T of the multi-connection system; determining a current opening degree k of an expansion valve of one indoor unit that is not turned on according to the oil storage quantity q and the system oil return time T; comparing the current opening degree k with a maximum opening degree threshold k smax and a minimum opening degree threshold k smin ; selectively adjusting the opening degree of the expansion valve according to a comparison result, and keeping the expansion valve operating at the adjusted opening degree for the system oil return time T.
  • the oil return control method of the present disclosure can precisely control the opening degree of the expansion valve and the oil return time of each indoor unit that is not turned on, so that at the same time of providing sufficient lubricating oil to the compressor, it can also be ensured that there is sufficient amount of refrigerant in the normally turned-on indoor units, thus giving considerations to both the oil return effect and the heat exchange performance of the system.
  • a “controller” may include hardware, software, or a combination thereof.
  • a module may include hardware circuits, various suitable sensors, communication ports and memories, and may also include software parts, such as program codes, or a combination of software and hardware.
  • FIG. 1 a typical structure of a multi-connection system will be first briefly introduced with reference to FIG. 1 .
  • the dotted line “- - - " in FIG. 1 represents liquid pipes
  • the solid line “-" in FIG. 1 represents gas pipes.
  • a multi-connection system includes an outdoor unit and n indoor units.
  • Each of the indoor units is connected to the outdoor unit through a gas pipe and a liquid pipe to form a refrigerant circulation system, and each of the indoor units further includes an expansion valve VE.
  • the expansion valve VE is arranged on the liquid pipe between the outdoor unit and the corresponding indoor unit, and is configured to adjust the amount of refrigerant flowing through the indoor unit.
  • the lubricating oil also circulates with the refrigerant in the system so as to lubricate and cool inner components of a compressor.
  • indoor units in the shutdown or standby state are collectively referred to as indoor units that are not turned on herein.
  • an opening degree of the expansion valves VE of the indoor units that are not turned on is adjusted to a fixed value within a preset period of time, so that the lubricating oil accumulated in the indoor units that are not turned on flows back into the compressor with the refrigerant, which is called an oil return control process of the multi-connection system.
  • the present disclosure provides an oil return control method for a multi-connection system, which can precisely control the opening degree of the expansion valve of each indoor unit that is not turned on and the oil return time thereof, so that at the same time of providing sufficient lubricating oil to the compressor, it can also be ensured that there is sufficient amount of refrigerant in the normally turned-on indoor units, thus giving considerations to both the oil return effect and the heat exchange performance of the system.
  • the main step flow of the oil return control method of the present disclosure includes:
  • the expansion valve of the turned-on indoor unit is always in an open state before the oil is returned.
  • the opening degrees of the expansion valves of all the turned-on indoor units are normally adjusted according to a control logic before the oil return.
  • a detailed step flow of the oil return control method of the present disclosure includes the following steps.
  • Step S100 determining an oil storage quantity q of all the indoor units.
  • step S 100 the oil storage quantity q of the indoor units is determined according to formula (1).
  • q P ⁇ t sp ⁇ P d ⁇ P s ⁇ R o
  • P represents a capacity horsepower of the indoor unit
  • t sp represents the shutdown time of the indoor unit
  • P d represents a system high pressure of the multi-connection system
  • P s represents a system low pressure of the multi-connection system
  • R o represents an oil storage coefficient of the indoor unit.
  • P represents the capacity horsepower of the indoor unit. This value is a performance parameter of the indoor unit, which has been clearly set at the factory and can be acquired directly when needed, without additional calculation.
  • t sp represents the shutdown time of the indoor unit. The shutdown time t sp of each indoor unit is stored in a controller of the multi-connection system, and can be read directly when needed.
  • P d and P s represent the system high pressure and system low pressure of the multi-connection system respectively. These two specific values can be collected by two pressure sensors installed on the outdoor unit, and then transmitted to the controller in a wired or wireless manner for storage. Also, they can be read directly when needed.
  • R o represents the oil storage coefficient of the indoor unit, and this value depends on an ambient temperature T ai of the indoor unit, a saturation temperature T pd corresponding to the system high pressure and a saturation temperature T ps corresponding to the system low pressure under different working conditions of the system.
  • Table 1 shows the oil storage coefficient R o obtained under different working conditions of the indoor unit through experimental verification, and an appropriate value can be chosen from Table 1 according to the actual working conditions of the indoor unit during calculation.
  • Step S200 determining a system oil return time T of the multi-connection system.
  • step S200 specifically includes: Step S201: acquiring the maximum oil storage quantity q max of the indoor unit.
  • the controller of the multi-connection system calculates and stores the oil storage quantity q of each indoor unit according to the aforementioned formula (1).
  • the oil storage quantity q of the indoor unit varies according to the different working condition of the indoor unit.
  • the controller traverses all the oil storage quantities q of the indoor unit that have been stored, finds out the maximum oil storage quantity q max therefrom and reads it directly.
  • Step S202 judging whether the maximum oil storage quantity q max is larger than the maximum oil storage quantity threshold q smax ; if yes, the process proceeds to step S203; otherwise, the process proceeds to step S204.
  • Step S203 determining the system oil return time T as the maximum oil return time threshold T smax .
  • the values of the maximum oil storage quantity threshold q smax and the maximum oil return time threshold T smax depend on various performance parameters of the indoor unit, and they can be set by those skilled in the art according to the specific performance parameters of the indoor unit.
  • step S300 After the oil storage quantity q of the indoor unit and the system oil return time T are determined, with continued reference to FIG. 2 , the oil return control method proceeds to step S300.
  • q smax , k smax and a minimum opening degree threshold k smin that will appear in subsequent steps depend on various performance parameters of the indoor unit, and they can be set by those skilled in the art according to the specific performance parameters of the indoor unit.
  • T smax depends on the actual working parameters of the multi-connection system, and it can be set by those skilled in the art according to the actual situation.
  • Step S400 comparing the current opening degree k with the maximum opening degree threshold k smax and a minimum opening degree threshold k smin .
  • Step S500 selectively adjusting the opening degree of the expansion valve according to a comparison result, and keeping the expansion valve operating at the adjusted opening degree for the system oil return time T.
  • Step S502 adjusting the opening degree of the expansion valve to k smin , and keeping the expansion valve operating at the adjusted opening degree for the indoor unit oil return time t.
  • Step S503 adjusting the opening degree of the expansion valve to zero, and keeping the expansion valve operating at the adjusted opening degree for a time T-t; then the process returns to the step of determining q.
  • step S504 the process proceeds to step S504 of keeping the expansion valve operating at the current opening degree k for the system oil return time T, and then the process returns to the step of determining q.
  • step S505 the process proceeds to step S505 of adjusting the opening degree of the expansion valve to k smax and keeping the expansion valve operating at the adjusted opening degree for the system oil return time T, and then the process returns to the step of determining q.
  • the oil return control method further includes: Step S600: keeping the expansion valve operating at the adjusted opening degree for an oil return interval time Ti.
  • the present disclosure will provide two methods of judging whether the expansion valve has operated at the adjusted opening degree for the oil return interval time T i , and the two methods will be described in detail below with reference to FIGS. 5 and 6 . It should be noted that in order to improve readability, the following two methods are distinguished by different step labels. Specifically, steps of the first method are denoted by a label S600, and steps of the second method are denoted by a label S600'.
  • step S600 of the first method specifically includes:
  • Step S602 judging whether the total oil storage quantity Q is larger than a maximum total oil storage quantity threshold Q smax ; if yes, the process proceeds to step S603; otherwise, the process returns to step S601.
  • Step S603 meaning that the expansion valve has operated at the adjusted opening degree for the oil return interval time Ti.
  • step S600' of the second method specifically includes:
  • the method for judging whether the expansion valve has operated at the adjusted opening degree for the oil return interval time T i is not limited to the above two methods, and those skilled in the art can also use other conventional means to judge.
  • the present disclosure also provides a multi-connection air conditioning system including a controller, and the controller is configured to be capable of executing the above refrigerant flow control method.
  • the basic functional components constituting the multi-connection air conditioning system and the working principle are basically the same as those in the prior art, and can be realized by those skilled in the art completely based on the prior art, so a repeated description thereof will not be given herein.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)
EP21800140.2A 2020-05-25 2021-02-08 Ölrücklaufsteuerverfahren für multisplitsystem Active EP4160102B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010449608.8A CN113719963B (zh) 2020-05-25 2020-05-25 多联机系统的回油控制方法
PCT/CN2021/075909 WO2021223481A1 (zh) 2020-05-25 2021-02-08 多联机系统的回油控制方法

Publications (3)

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EP4160102A1 true EP4160102A1 (de) 2023-04-05
EP4160102A4 EP4160102A4 (de) 2023-12-06
EP4160102B1 EP4160102B1 (de) 2025-01-08

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EP21800140.2A Active EP4160102B1 (de) 2020-05-25 2021-02-08 Ölrücklaufsteuerverfahren für multisplitsystem

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EP (1) EP4160102B1 (de)
CN (1) CN113719963B (de)
WO (1) WO2021223481A1 (de)

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
CN114135973B (zh) * 2021-11-15 2023-02-03 珠海格力电器股份有限公司 一种多联机控制方法、装置及多联机
CN115789995B (zh) * 2022-10-18 2025-06-20 青岛海尔空调电子有限公司 用于压缩机回油的控制方法及装置、压缩机系统
IT202200022080A1 (it) * 2022-10-26 2024-04-26 Ariston Spa Pompa di calore con modulazione ampliata del dispositivo di espansione

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JPH102626A (ja) * 1996-06-12 1998-01-06 Mitsubishi Heavy Ind Ltd 空気調和装置
CN100520208C (zh) * 2006-07-12 2009-07-29 松下电器产业株式会社 多室型空调装置
JP4877052B2 (ja) * 2006-07-12 2012-02-15 パナソニック株式会社 多室形空気調和機
JP5484930B2 (ja) * 2010-01-25 2014-05-07 三菱重工業株式会社 空気調和機
JP5798830B2 (ja) * 2011-07-29 2015-10-21 三菱重工業株式会社 超臨界サイクルヒートポンプ
JP6790115B2 (ja) * 2016-11-25 2020-11-25 三菱電機株式会社 冷凍サイクル装置
CN106839330B (zh) * 2017-03-03 2020-01-07 广东美的暖通设备有限公司 油平衡控制方法及油平衡控制装置、多联机空调系统
CN108224850A (zh) * 2017-12-29 2018-06-29 广东美的制冷设备有限公司 回油控制方法、装置、空调器和计算机可读存储介质
CN109357440B (zh) * 2018-10-26 2019-11-05 宁波奥克斯电气股份有限公司 一种多联机制热回油控制方法及多联机空调器
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CN110296547B (zh) * 2019-07-04 2020-04-21 宁波奥克斯电气股份有限公司 一种多联机回油控制方法、系统及空调器
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Publication number Publication date
CN113719963B (zh) 2022-12-27
WO2021223481A1 (zh) 2021-11-11
EP4160102A4 (de) 2023-12-06
EP4160102B1 (de) 2025-01-08
CN113719963A (zh) 2021-11-30

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