EP3182039A1 - Verfahren und vorrichtung zur steuerung des kältemittelflusses eines einrichtungssystems mit mehreren leitungen - Google Patents

Verfahren und vorrichtung zur steuerung des kältemittelflusses eines einrichtungssystems mit mehreren leitungen Download PDF

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Publication number
EP3182039A1
EP3182039A1 EP16820687.8A EP16820687A EP3182039A1 EP 3182039 A1 EP3182039 A1 EP 3182039A1 EP 16820687 A EP16820687 A EP 16820687A EP 3182039 A1 EP3182039 A1 EP 3182039A1
Authority
EP
European Patent Office
Prior art keywords
expansion valve
electronic expansion
opening
cooling indoor
indoor unit
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
EP16820687.8A
Other languages
English (en)
French (fr)
Other versions
EP3182039A4 (de
EP3182039B1 (de
Inventor
Bin Luo
Yuanyang Li
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.)
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment 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 Midea Group Co Ltd, GD Midea Heating and Ventilating Equipment Co Ltd filed Critical Midea Group Co Ltd
Publication of EP3182039A1 publication Critical patent/EP3182039A1/de
Publication of EP3182039A4 publication Critical patent/EP3182039A4/de
Application granted granted Critical
Publication of EP3182039B1 publication Critical patent/EP3182039B1/de
Active 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
    • 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
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • 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
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • 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
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators
    • 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
    • F25B2600/2509—Economiser 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves

Definitions

  • the present disclosure relates to air conditioner technology field, and more particularly to a method and a device for controlling refrigerant distribution of a multi-split air-conditioning system.
  • Refrigerant volume entering the cooling indoor unit and discharge superheat of the cooling indoor unit will be affected by an opening of the electronic expansion valve.
  • the refrigerant volume entering the cooling indoor unit is reduced because of the inappropriate opening of the electronic expansion valve, the cooling effect of the cooling indoor unit will be affected; and when the discharge superheat is reduced because of the inappropriate opening of the electronic expansion valve, the liquid strike on a compressor will be caused and the compressor is damaged.
  • a first objective of the present disclosure is to provide a method for controlling refrigerant distribution of a multi-split air-conditioning system, which may ensure the cooling effect of the cooling indoor unit and may avoid the liquid strike on the compressor under the main heating mode, and ensure the compressor to operate safely and reliably.
  • a second objective of the present disclosure is to provide a device for controlling refrigerant distribution of a multi-split air-conditioning system.
  • a method for controlling refrigerant distribution of a multi-split air-conditioning system includes: a re-cooling system including a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve, and a flow distributing device.
  • the method includes followings: when the multi-split air-conditioning system enters a main heating mode, controlling the second electronic expansion valve to close; controlling an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, calculating a target opening of the second electronic expansion valve according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit; and controlling the second electronic expansion valve according to the target opening.
  • the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit.
  • the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
  • the method according to the above embodiments may further include additional technical features as follows.
  • the total opening is obtained according to following acts of: when the multi-split air-conditioning system enters a pure heating mode, obtaining a discharge superheat; and calculating the total opening using a PI (Proportional-Integral) algorithm according to the discharge superheat.
  • PI Proportional-Integral
  • a device for controlling refrigerant distribution of a multi-split air-conditioning system includes: a re-cooling system including a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve, and a flow distributing device.
  • the device for controlling refrigerant distribution of a multi-split air-conditioning system includes: a first control module, configured to control the second electronic expansion valve to close when the multi-split air-conditioning system enters a main heating mode; a second control module, configured to control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment; a calculating module, configured to calculate a target opening of the second electronic expansion valve according to a total opening and a maximum opening of the electronic expansion valve corresponding to the cooling indoor unit when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening; and a third control module, configured to control the second electronic expansion valve according to the target opening.
  • the device for controlling refrigerant distribution of a multi-split air-conditioning system in embodiments of the present disclosure, when the multi-split air-conditioning system enters the main cooling mode, first the second electronic expansion valve is controlled to close, the opening of the electronic expansion valve corresponding to the cooling indoor unit is controlled, and after the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the opening of the second electronic expansion valve is controlled according to the total opening. Therefore, the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit. Meanwhile, according to the control of the total opening, the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
  • the device according to the above embodiments may further include additional technical features as follows.
  • the total opening is obtained according to following acts of: when the multi-split air-conditioning system enters a pure heating mode, obtaining a discharge superheat; and calculating the total opening using a PI (Proportional-Integral) algorithm according to the discharge superheat.
  • PI Proportional-Integral
  • Fig. 1 is a flow chart of a method for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure.
  • the multi-split air-conditioning system includes: a re-cooling system and a flow distributing device.
  • the re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve.
  • the method for controlling refrigerant distribution of a multi-split air-conditioning system includes followings.
  • step S101 when the multi-split air-conditioning system enters a main heating mode, the second electronic expansion valve is controlled to close.
  • step S102 an electronic expansion valve corresponding to a cooling indoor unit is controlled to perform an opening adjustment.
  • the discharge superheat of an outdoor unit may be controlled by controlling an opening of the second electronic expansion valve.
  • the discharge superheat of the outdoor unit and a refrigerant volume flowing into the cooling indoor unit are controlled by controlling the opening of the second electronic expansion valve and an opening of the electronic expansion valve corresponding to the cooling indoor unit.
  • the opening of the second electronic expansion valve and the opening of the electronic expansion valve corresponding to the cooling indoor unit may be calculated according to the refrigerant volume required by the cooling indoor unit for cooling.
  • the electronic expansion valve corresponding to the cooling indoor unit may also play the role of the second electronic expansion valve, i.e.
  • the opening of the electronic expansion valve corresponding to the cooling indoor unit may be controlled preferentially in that mode, that is, in step S101, before controlling the electronic expansion valve corresponding to the cooling indoor unit to perform the opening adjustment, the second electronic expansion valve may be controlled to close, and then the control on the discharge superheat of the outdoor unit and the refrigerant volume flowing into the cooling indoor unit may also be realized.
  • step S103 when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches a maximum opening, a target opening of the second electronic expansion valve is calculated according to a total opening and the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit.
  • ⁇ EXV2 is the target opening of the second electronic expansion valve
  • EXV2(PI) is the total opening
  • EV(cooling indoor)MAX is the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit
  • a EV(cooling indoor) is a valve circulating area of the electronic expansion valve corresponding to the cooling indoor unit
  • a EXV2 is a valve circulating area of the second electronic expansion valve.
  • the total opening may be obtained by calculating in the pure heating mode.
  • the discharge superheat, the discharge temperature and the returned-gas superheat of the outdoor unit are controlled by the second electronic expansion valve, such that the reliability of the compressor is ensured and the liquid strike on the compressor is avoided.
  • the discharge superheat is obtained; and the total opening is calculated using a PI algorithm according to the discharge superheat.
  • step 104 the second electronic expansion valve is controlled according to the target opening.
  • the second electronic expansion valve is controlled according to the calculated target opening, such that the discharge superheat of the outdoor unit may be controlled.
  • the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit.
  • the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
  • a device for controlling refrigerant distribution of a multi-split air-conditioning system is also provided in the present disclosure.
  • Fig. 3 is a block diagram of a device for controlling refrigerant distribution of a multi-split air-conditioning system according to an embodiment of the present disclosure.
  • the multi-split air-conditioning system includes: a re-cooling system and a flow distributing device.
  • the re-cooling system includes a first heat exchanger, a second heat exchanger, a first electronic expansion valve and a second electronic expansion valve.
  • the device for controlling refrigerant distribution of a multi-split air-conditioning system includes: a first control module 10, a second control module 20, a calculating module 30 and a third control module 40.
  • the first control module 10 is configured to control the second electronic expansion valve to close when the multi-split air-conditioning system enters a main heating mode.
  • the second control module 20 is configured to control an electronic expansion valve corresponding to a cooling indoor unit to perform an opening adjustment.
  • the discharge superheat of an outdoor unit may be controlled by controlling an opening of the second electronic expansion valve.
  • the discharge superheat of the outdoor unit and a refrigerant volume flowing into the cooling indoor unit are controlled by controlling the opening of the second electronic expansion valve and an opening of the electronic expansion valve corresponding to the cooling indoor unit.
  • the opening of the second electronic expansion valve and the opening of the electronic expansion valve corresponding to the cooling indoor unit may be calculated according to the refrigerant volume required by the cooling indoor unit for cooling.
  • the electronic expansion valve corresponding to the cooling indoor unit may also play the role of the second electronic expansion valve, i.e.
  • the opening of the electronic expansion valve corresponding to the cooling indoor unit may be controlled by the second control module 20 preferentially in that mode, that is, before controlling by the second control module 20 the electronic expansion valve corresponding to the cooling indoor unit to perform the opening adjustment, the second electronic expansion valve may be controlled to close by the first control module 10, and then the control on the discharge superheat of the outdoor unit and the refrigerant volume flowing into the cooling indoor unit may also be realized.
  • the calculating module 30 is configured to calculate a target opening of the second electronic expansion valve according to a total opening and a maximum opening of the electronic expansion valve corresponding to the cooling indoor unit when an opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening.
  • ⁇ EXV2 is the target opening of the second electronic expansion valve
  • EXV2(PI) is the total opening
  • EV(cooling indoor)MAX is the maximum opening of the electronic expansion valve corresponding to the cooling indoor unit
  • a EV(cooling indoor) is a valve circulating area of the electronic expansion valve corresponding to the cooling indoor unit
  • a EXV2 is a valve circulating area of the second electronic expansion valve.
  • the total opening may be obtained by calculating in the pure heating mode.
  • the discharge superheat, the discharge temperature and the returned-gas superheat of the outdoor unit are controlled by the second electronic expansion valve, such that the reliability of the compressor is ensured and the liquid strike on the compressor is avoided.
  • the discharge superheat is obtained; and the total opening is calculated using a PI algorithm according to the discharge superheat.
  • the third control module 40 is configured to control the second electronic expansion valve according to the target opening.
  • the second electronic expansion valve may be controlled according to the calculated target opening by the third control module 40, such that the discharge superheat of the outdoor unit may be controlled.
  • the device for controlling refrigerant distribution of a multi-split air-conditioning system in embodiments of the present disclosure, when the multi-split air-conditioning system enters the main cooling mode, first the second electronic expansion valve is controlled to close, the opening of the electronic expansion valve corresponding to the cooling indoor unit is controlled, and after the opening of the electronic expansion valve corresponding to the cooling indoor unit reaches the maximum opening, the opening of the second electronic expansion valve is controlled according to the total opening. Therefore, the refrigerating capacity of the cooling indoor unit may be controlled by controlling the refrigerant volume flowing into the cooling indoor unit so as to ensure the cooling effect of the cooling indoor unit. Meanwhile, according to the control of the total opening, the discharge superheat is effectively controlled, such that the liquid strike on the compressor may be avoided, and the compressor is ensured to operate safely and reliably.
  • first and second are used herein for purposes of description and are not intended to indicate or imply relative importance or significance or to imply the number of indicated technical features.
  • the feature defined with “first” and “second” may comprise one or more of this feature.
  • a plurality of means two or more than two, unless specified otherwise.
  • the terms “mounted,” “connected,” “coupled,” “fixed” and the like are used broadly, and may be, for example, fixed connections, detachable connections, or integral connections; may also be mechanical or electrical connections; may also be direct connections or indirect connections via intervening structures; may also be inner communications of two elements, which can be understood by those skilled in the art according to specific situations.
  • a structure in which a first feature is "on" or “below” a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween.
  • a first feature "on,” “above,” or “on top of” a second feature may include an embodiment in which the first feature is right or obliquely “on,” “above,” or “on top of” the second feature, or just means that the first feature is at a height higher than that of the second feature; while a first feature “below,” “under,” or “on bottom of” a second feature may include an embodiment in which the first feature is right or obliquely “below,” “under,” or “on bottom of” the second feature, or just means that the first feature is at a height lower than that of the second feature.
EP16820687.8A 2015-07-06 2016-04-26 Verfahren und vorrichtung zur steuerung des kältemittelflusses eines einrichtungssystems mit mehreren leitungen Active EP3182039B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510395506.1A CN105115199B (zh) 2015-07-06 2015-07-06 多联机系统的冷媒分流控制方法和装置
PCT/CN2016/080246 WO2017005036A1 (zh) 2015-07-06 2016-04-26 多联机系统的冷媒分流控制方法和装置

Publications (3)

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EP3182039A1 true EP3182039A1 (de) 2017-06-21
EP3182039A4 EP3182039A4 (de) 2018-05-02
EP3182039B1 EP3182039B1 (de) 2020-09-30

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US (1) US20170198956A1 (de)
EP (1) EP3182039B1 (de)
CN (1) CN105115199B (de)
WO (1) WO2017005036A1 (de)

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US20170198956A1 (en) 2017-07-13
WO2017005036A1 (zh) 2017-01-12
CN105115199A (zh) 2015-12-02
EP3182039A4 (de) 2018-05-02
EP3182039B1 (de) 2020-09-30
CN105115199B (zh) 2017-10-31

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