WO2016107202A1 - 并联多联机的冷媒控制方法 - Google Patents

并联多联机的冷媒控制方法 Download PDF

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Publication number
WO2016107202A1
WO2016107202A1 PCT/CN2015/088396 CN2015088396W WO2016107202A1 WO 2016107202 A1 WO2016107202 A1 WO 2016107202A1 CN 2015088396 W CN2015088396 W CN 2015088396W WO 2016107202 A1 WO2016107202 A1 WO 2016107202A1
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WIPO (PCT)
Prior art keywords
outdoor unit
superheat degree
refrigerant
superheat
average
Prior art date
Application number
PCT/CN2015/088396
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English (en)
French (fr)
Inventor
马熙华
许永锋
熊美兵
胡伟龙
Original Assignee
广东美的暖通设备有限公司
美的集团股份有限公司
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.)
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Publication date
Application filed by 广东美的暖通设备有限公司, 美的集团股份有限公司 filed Critical 广东美的暖通设备有限公司
Priority to US15/329,452 priority Critical patent/US10436489B2/en
Priority to BR112016030913A priority patent/BR112016030913A2/pt
Priority to EP15874888.9A priority patent/EP3150942A4/en
Publication of WO2016107202A1 publication Critical patent/WO2016107202A1/zh

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    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety 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
    • F24F11/30—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
    • 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
    • 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
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger

Definitions

  • the invention relates to refrigeration technology, in particular to a refrigerant control method for parallel multi-connection.
  • the size of the heat exchanger of each outdoor unit and the amount of suction of the compressor may be different.
  • the usage environment and system load will also change with time, plus the installation specifications. The degree and various differences will cause the refrigerant that comes back from the indoor unit during the heating operation in parallel, and the distribution between the outdoor units is uneven.
  • Some outdoor units distribute less refrigerant, which is easier to evaporate in the outdoor unit's heat exchanger and form overheating; some outdoor units distribute more refrigerant, while the outdoor unit's heat exchanger has limited heat transfer capacity. Completely evaporated. As a result, the superheat of some compressors is too high, and the superheat of some compressors is too low.
  • the present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention needs to provide a refrigerant control method in parallel and multiple connections.
  • the superheat of the outdoor unit is the superheat of the compressor of the outdoor unit or the degree of superheat at the outlet of the heat exchanger of the outdoor unit.
  • the current superheat of the outdoor unit is too high relative to the average superheat, which means that the superheat degree of the outdoor unit is greater than the predetermined superheat degree; the current outdoor unit The fact that the heat is too low relative to the average superheat means that the superheat of the outdoor unit is currently less than the predetermined degree of the average superheat.
  • the step S2 increases the amount of refrigerant entering the current outdoor unit by opening the opening degree of the electronic expansion valve before the compressor of the current outdoor unit; the step S3 is to close the current current The opening of the electronic expansion valve in front of the compressor of the outdoor unit reduces the amount of refrigerant entering the current outdoor unit.
  • the refrigerant control method further includes: after the step S2:
  • step S21 determining, after the first predetermined time, whether the superheat degree of the outdoor unit and the average superheat degree are higher than a preset maximum superheat degree; if yes, proceeding to step S22; if not, returning after the second predetermined time The step S1; and
  • the refrigerant control method further includes: after the step S3:
  • step S31 After the third predetermined time, determining whether the superheat degree of the outdoor unit and the average superheat degree are lower than a preset minimum superheat degree, if yes, proceeding to step S32, and if not, returning after the fourth predetermined time The step S1; and
  • the refrigerant control method further includes:
  • the amount of refrigerant entering each of the outdoor units is determined by comparing the superheat degree of the outdoor unit and the average degree of superheat (system), and is adjusted from the overall angle of the system.
  • the amount of refrigerant per unit of the outdoor unit enables the compressor to be in a good operating range, thereby avoiding the occurrence of the compressor
  • the problem caused by excessive or insufficient superheat increases the reliability of the multi-line operation.
  • FIG. 1 is a schematic diagram of a multi-connected functional module of a refrigerant control system and method according to a preferred embodiment of the present invention.
  • FIG. 2 is a flow chart showing a refrigerant control method according to a preferred embodiment of the present invention.
  • the multi-connection 10 includes a plurality of parallel outdoor units 12 and a plurality of parallel indoor units 14.
  • the outdoor unit 12 is connected to the indoor unit 14, and a refrigerant (not shown, for example, Freon) circulates between the outdoor unit 12 and the indoor unit 14.
  • a refrigerant not shown, for example, Freon
  • the refrigerant is pressurized by the compressor 122 of the outdoor unit 12 to become a high-temperature high-pressure gas, and enters the heat exchanger of the indoor unit 14 (the condenser diagram is not shown at this time, and the figure is not shown as a condenser at this time).
  • the condensate liquefies and releases heat to become a liquid, and at the same time heats the indoor air to achieve the purpose of increasing the indoor temperature.
  • the liquid is depressurized by the throttling device, enters the heat exchanger 124 of the outdoor unit 12 (in this case, the evaporator), evaporates and vaporizes to absorb heat, becomes a gas, and absorbs heat of the outdoor air (the outdoor air becomes colder).
  • the refrigerant that becomes the gas enters the compressor 122 again to start the next cycle.
  • each of the outdoor units 12 along the refrigerant also includes an electronic expansion valve 126 in front of the heat exchanger 124 and a four-way valve 128 in front of the compressor 122.
  • the electronic expansion valve 126 adjusts the opening according to a preset program or control signal to adjust the amount of refrigerant entering the heat exchanger 124. For example, the opening of the large electronic expansion valve 126 can increase the amount of refrigerant entering the outdoor unit 12. Conversely, the opening of the small electronic expansion valve 126 can reduce the amount of refrigerant entering the outdoor unit 12.
  • the electronic expansion valve 126 may be an electromagnetic expansion valve or an electric expansion valve. In the present embodiment, the electronic expansion valve 126 is an electromagnetic expansion valve.
  • the four-way valve 128 has four ports A-D.
  • AB is connected
  • CD is connected
  • the refrigerant is compressed into high-temperature and high-pressure gas by compressor 122. It passes through port A of the four-way valve and is discharged from port B to enter the indoor heat exchanger (cold
  • the condenser becomes a medium-temperature and high-pressure liquid after the condenser is cooled and released by heat, and becomes a low-temperature and low-pressure liquid after passing through the electronic expansion valve 126, and is subjected to the heat absorption and cooling action of the outdoor heat exchanger 124 (evaporator).
  • the low-temperature and low-pressure gas passes through the D port of the four-way valve, returns from the C port to the compressor 122, and then continues to circulate.
  • the multiple connection 10 of the present embodiment further includes a refrigerant control system 16 for controlling the distribution of the refrigerant between the respective outdoor units 12.
  • the refrigerant control system 16 may include a temperature sensor disposed in each of the outdoor units 12 and a multi-line control system (not shown).
  • a refrigerant control method may be implemented by the refrigerant control system 16 and includes the following steps:
  • the amount of refrigerant entering each of the outdoor units 12 is determined by comparing the superheat degree of the current outdoor unit 12 with the average superheat degree (system), and is adjusted from the overall system angle to each outdoor unit.
  • the amount of refrigerant of the machine 12 enables the compressor 122 to be in a good operating range, thereby avoiding problems caused by excessive or insufficient superheat of the compressor 122, and improving the reliability of the multi-line 10 operation.
  • the degree of superheat of the outdoor unit 12 is the degree of superheat of the compressor 122 of the outdoor unit 12. In other embodiments, the degree of superheat of the outdoor unit 12 may also be the degree of superheat at the outlet of the heat exchanger 124 of the outdoor unit 12.
  • Step S1 may be implemented by the refrigerant control system 16.
  • the temperature sensor of the refrigerant control system 16 measures various required temperatures (e.g., the temperature of the exhaust pipe of each compressor 122), and then the control system calculates each of the outdoor units 12 based on the thermometer.
  • the superheat degree Tsh and the average superheat degree Ta are compared. That is to say, in step S1, it is actually included to measure the temperature and calculate the superheat degree Tsh and the average superheat degree Ta of each of the outdoor units 12.
  • the current outdoor unit 12 refers to the outdoor unit 12 currently being controlled.
  • the refrigerant control system and method of the preferred embodiment of the present invention controls each of the outdoor units 12 simultaneously or in a certain order.
  • step S2 the superheat degree Tsh of the current outdoor unit 12 is too high with respect to the average superheat degree Ta to mean Tsh-Ta> ⁇ T.
  • step S3 the superheat degree Tsh of the current outdoor unit 12 is too low with respect to the average superheat degree Ta to mean Ta-Tsh> ⁇ T.
  • the step S2 increases the amount of refrigerant entering the current outdoor unit 12 by opening the opening degree of the electronic expansion valve 126 of the current outdoor unit 12.
  • step S3 reduces the amount of refrigerant entering the current outdoor unit 12 by turning off the opening degree of the electronic expansion valve 126 before the compressor 122 of the current outdoor unit 12.
  • the superheat of the current outdoor unit 12 can also be determined by other means. Whether or not Tsh is too high or too low with respect to the average superheat degree Ta is not limited to the present embodiment.
  • the steps S2-S3 can be implemented by the refrigerant control system 16. Specifically, the control system compares the superheat degree Tsh and the average superheat degree Ta of the current outdoor unit 12, and then controls the opening degree of the electronic expansion valve 126 according to the result to adjust the entry into the current outdoor unit 12. The amount of refrigerant. As such, the opening of the electronic expansion valve 126 needs to be initialized during initialization of the refrigerant control system and method.
  • the refrigerant control method further includes:
  • step S2 the opening E is increased by ⁇ E1, that is, E + ⁇ E1.
  • step S3 the magnitude of the decrease in the opening E is also ⁇ E1, that is, E- ⁇ E1.
  • the refrigerant control method further includes: after step S2:
  • step S2 it can be understood that if the superheat degree Tsh and the average superheat degree Ta of the current outdoor unit 12 are higher than the maximum superheat degree Tmax after the first predetermined time t1 after the adjustment in step S2, it can be determined that the amount of refrigerant of the outdoor unit 12 is still insufficient.
  • the superheat degree exceeds the predetermined maximum superheat degree Tmax, and the average superheat degree Ta is pushed up, the amount of refrigerant entering the current outdoor unit 12 needs to be increased in step S22.
  • the opening E is increased by ⁇ E2, that is, E + ⁇ E2.
  • step S22 After the operation of the second predetermined time t2 is increased after the amount of the refrigerant entering the current outdoor unit 12 is increased in step S22, the process returns to step S1 to continue the control. Of course, if it is not determined that the amount of refrigerant of the outdoor unit 12 is still insufficient, the process returns to step S1 and continues to control after step S21.
  • Steps S21-S22 may be implemented by the refrigerant control system 16.
  • the temperature sensor of the refrigerant control system 16 measures various required temperatures (for example, the temperature of the exhaust pipe of each compressor 122), and then the control system calculates the superheat degree Tsh and the average superheat degree Ta of the current outdoor unit 12 based on the thermometer. Compare with Tmax.
  • the specific values of ⁇ E2, the first predetermined time t1 and the second predetermined time t2 should be determined according to the actual use environment and requirements, and may be the same or different.
  • the refrigerant control method further includes: after step S3:
  • step S32 reduces the amount of refrigerant entering the current outdoor unit 12.
  • the magnitude of the decrease in the opening E is also ⁇ E2, that is, E- ⁇ E2.
  • step S32 After the operation of the fourth predetermined time t4 is reduced after the amount of the refrigerant entering the current outdoor unit 12 is reduced in step S32, the process returns to step S1 to continue the control. Of course, if it is not determined that the amount of refrigerant of the outdoor unit 12 is still insufficient, the process returns to step S1 and continues to control after step S31.
  • Steps S31-S32 may be implemented by the refrigerant control system 16.
  • the temperature sensor of the refrigerant control system 16 measures various required temperatures (for example, the temperature of the exhaust pipe of each compressor 122), and then the control system calculates the superheat degree Tsh and the average superheat degree Ta of the current outdoor unit 12 based on the thermometer. Compare with Tmin.
  • the refrigerant control method further includes:
  • step S5 If yes, increase the amount of refrigerant entering the current outdoor unit 12, after the fifth predetermined time t5, return to step S1;
  • steps S4-S8 are added to prevent the overall superheat of the system from being too high or too low.
  • the steps S4-S8 are added to prevent the overall superheat of the system from being too high or too low.
  • the superheat of the single outdoor unit 12 cannot be compared with the system, it is judged whether the superheat is too high or too low. It is still necessary to control the amount of refrigerant of the current outdoor unit 12 according to the degree of superheat of the system. That is, if it is determined in step S4 that the system superheat is too high, which is greater than the maximum superheat degree Tmax, the amount of refrigerant of the current outdoor unit 12 is increased in step S5 and the process returns to step S1 to continue control after the fifth predetermined time t5, otherwise in step S4.
  • step S5 Go to step S5 to determine that the system superheat is too low, less than the minimum superheat degree Tmin, then reduce the amount of refrigerant entering the current outdoor unit 12 in step S7 and return to step S1 to continue control after the sixth predetermined time t6, otherwise, the system superheat is also proved. Normal, the opening remains the same.
  • step S5 the opening E is increased by an amplitude of ⁇ E2, that is, E + ⁇ E2.
  • step S8 the degree of decrease in the opening E is also ⁇ E2, that is, E- ⁇ E2.
  • Steps S4-S8 can be implemented by the refrigerant control system 16.
  • the temperature sensor of the refrigerant control system 16 measures various required temperatures (for example, the temperature of the exhaust pipe of each compressor 122), and then the control system calculates the average superheat degree Ta based on the thermometer, and then the maximum superheat degree Tmax and the minimum The heat Tmin is compared.
  • first predetermined time t1, the second predetermined time t2, the third predetermined time t3, the fourth predetermined time t4, the fifth predetermined time t5, and the sixth predetermined time t6 may be the same or different.
  • ⁇ E1 and ⁇ E2 may also be the same or different.
  • the terms “installation”, “connected”, and “connected” should be understood broadly, and may be a fixed connection, for example, or They are detachable or integrally connected; they can be mechanically connected, they can be electrically connected or can communicate with each other; they can be connected directly or indirectly through an intermediate medium, which can be internal or two components of two components. Interaction relationship.
  • an intermediate medium which can be internal or two components of two components. Interaction relationship.
  • the "on" or “below” of the second feature may include direct contact of the first and second features, and may also include the first sum, unless otherwise specifically defined and defined.
  • the second feature is not in direct contact but through additional features between them.
  • the first feature “above”, “above” and “above” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature includes the first feature directly above and above the second feature, or merely the first feature level being less than the second feature.
  • a "computer-readable medium” can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with the instruction execution system, apparatus, or device.
  • computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
  • the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.
  • portions of the embodiments of the invention may be implemented in hardware, software, firmware or a combination thereof.
  • multiple steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a suitable instruction execution system For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.
  • each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Abstract

公开了一种并联多联机的冷媒控制方法，包括：S1：在制热模式中，比较每台室外机(12)的过热度Tsh与多台室外机(12)的平均过热度Ta；S2：若当前室外机(12)的过热度Tsh相对于平均过热度Ta过高，则增加进入当前室外机(12)的冷媒量；及S3：若当前室外机(12)的过热度Tsh相对于平均过热度Ta过低，则减少进入当前室外机(12)的冷媒量。如此，进入每台室外机(12)的冷媒量由当前室外机(12)的过热度Tsh与平均过热度Ta比较决定，从系统整体角度来调节进入每台室外机(12)的冷媒量，能使压缩机(122)处于良好的运行范围，从而避免出现因压缩机(122)过热度过高或不足导致的问题，提高多联机运行的可靠性。

Description

并联多联机的冷媒控制方法
优先权信息
本申请请求2014年12月29日向中国国家知识产权局提交的、专利申请号为201410849263.X的专利申请的优先权和权益，并且通过参照将其全文并入此处。
技术领域
本发明涉及制冷技术，尤其是涉及一种并联多联机的冷媒控制方法。
背景技术
在多台室外机并联的多联机系统中，由于各台室外机的换热器大小、压缩机吸气量大小可能不相同，使用环境和系统负荷也会随时间不断变化，加上安装的规范程度，各种差异都会导致并联的室外机在制热运行时，从室内机回来的冷媒，在室外机之间的分配不均匀。有的室外机分配到的冷媒较少，较易在室外机的换热器中蒸发并形成过热；有的室外机分配到的冷媒较多，而室外机的换热器换热能力有限，无法完全蒸发。从而导致有的压缩机的过热度过高，有的压缩机的过热度过低。压缩机的过热度过高会造成压缩机电机散热不良，过高的温度也会使压缩机内冷冻油容易发生变质而润滑不良，影响压缩机的寿命；而压缩机过热度过低表明压缩机的吸气口的冷媒有可能以液体的形式存在，过多未能完全蒸发的冷媒可压缩性较差，会令压缩机电流功率增大，同时液态的冷媒使冷冻油被稀释，使得进入压缩机的压缩腔内的冷冻油减少，压缩腔磨损加重。现有的调节方式一般以单台室外机的压缩机为对象进行调节，然而，多联机系统各台室外机的调节会彼此影响，没有使多联机系统得到整体上的控制。因此，多联机系统的压缩机过热度必须保证在适合的范围，并且不同室外机之间的压缩机过热度不能出现较大的差异。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一。为此，本发明需要提供一种并联多联机的冷媒控制方法。
根据本发明实施方式并联多联机的冷媒控制方法包括：
S1：在制热模式中，比较所述多联机的每台室外机的过热度与多台所述室外机的平均过热度；
S2：若当前所述室外机的过热度相对于所述平均过热度过高则增加进入当前所述室外机的冷媒量；及
S3：若当前所述室外机的过热度相对于所述平均过热度过低则减少进入当前所述室外机的冷媒量。
在某些实施方式中，所述室外机的过热度为所述室外机的压缩机过热度或者所述室外机的换热器的出口处的过热度。
在某些实施方式中，当前所述室外机的过热度相对于所述平均过热度过高是指当前所述室外机的过热度大于所述平均过热度预定幅度；当前所述室外机的过热度相对于所述平均过热度过低是指当前所述室外机的过热度小于所述平均过热度所述预定幅度。
在某些实施方式中，所述步骤S2通过开大当前所述室外机的压缩机前的电子膨胀阀的开度来增加进入当前所述室外机的冷媒量；所述步骤S3通过关小当前所述室外机的压缩机前的电子膨胀阀的开度来减少进入当前所述室外机的冷媒量。
在某些实施方式中，所述冷媒控制方法在所述步骤S2后还包括：
S21：第一预定时间后判断当前所述室外机的过热度与所述平均过热度是否高于预设最大过热度；若是则进入步骤S22，若否，则经所述第二预定时间后返回所述步骤S1；及
S22：若是，则增加进入当前所述室外机的冷媒量，经第二预定时间后返回所述步骤S1。
在某些实施方式中，所述冷媒控制方法在所述步骤S3后还包括：
S31：第三预定时间后判断当前所述室外机的过热度与所述平均过热度是否低于预设最小过热度，若是则进入步骤S32，若否，则经所述第四预定时间后返回所述步骤S1；及
S32：若是，则减少进入当前所述室外机的冷媒量，经第四预定时间后返回所述步骤S1。
在某些实施方式中，所述冷媒控制方法还包括：
S4：若当前所述室外机的过热度相对于所述平均过热度未过高或过低则判断所述平均过热度是否大于预定最大过热度；
S5：若是则增加进入当前所述室外机的冷媒量，经第五预定时间后返回所述步骤S1；
S6：若否，则判断所述平均过热度是否小于预定最小过热度；
S7：若是，则减少进入当前所述室外机的冷媒量，经第六预定时间后返回所述步骤S1；
S8：若否，维持进入当前所述室外机的冷媒量不变。
本发明较佳实施方式的冷媒控制方法中，进入每台所述室外机的冷媒量由当前所述室外机的过热度与所述平均过热度(系统)比较决定，从系统整体角度来调节进入每台所述室外机的冷媒量，能使所述压缩机处于良好的运行范围，从而避免出现因所述压缩机 过热度过高或不足导致的问题，提高所述多联机运行的可靠性。
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是本发明较佳实施方式的冷媒控制系统及方法应用的多联机的功能模块示意图。
图2是本发明较佳实施方式的冷媒控制方法的流程示意图。
具体实施方式
下面详细描述本发明的实施方式的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明的实施方式，而不能理解为对本发明的实施方式的限制。
以下结合附图对本发明的实施方式并联多联机的冷媒控制方法作进一步说明。
图1是本发明较佳实施方式的冷媒控制方法应用的多联机10。多联机10包括多台并联的室外机12及多台并联的室内机14。室外机12与室内机14连接，冷媒(图未示，例如氟利昂)在室外机12与室内机14之间循环。多联机10制热时，冷媒被室外机12的压缩机122加压，成为高温高压气体，进入室内机14的换热器(此时为冷凝器图未示，图未示此时为冷凝器)，冷凝液化放热，成为液体，同时将室内空气加热，从而达到提高室内温度的目的。液体经节流装置减压，进入室外机12的换热器124(此时为蒸发器)，蒸发气化吸热，成为气体，同时吸取室外空气的热量(室外空气变得更冷)。成为气体的冷媒再次进入压缩机122开始下一个循环。
每台室外机12沿冷媒的走向还包括在换热器124前的电子膨胀阀126及在压缩机122前的四通阀128。
电子膨胀阀126是按照预设程序或者控制信号调节开度从而调节进入换热器124的冷媒量。例如开大电子膨胀阀126的开度可增加进入室外机12的冷媒量，反之，关小电子膨胀阀126的开度可减少进入室外机12的冷媒量。电子膨胀阀126可以是电磁式膨胀阀或电动式膨胀阀。本实施方式中，电子膨胀阀126为电磁式膨胀阀。
四通阀128，具有四个油口A-D。制热时，AB连通，CD连通，冷媒通过压缩机122压缩转变为高温高压的气体，通过四通阀的A口，由B口排出，进入室内热交换器(冷 凝器)，在冷凝器吸冷放热后变成中温高压的液体，经电子膨胀阀126后变成低温低压的液体，经过室外热交换器124(蒸发器)吸热放冷作用后，变成低温低压的气体，经过四通阀D口，由C口回到压缩机122，然后继续循环。
本实施方式的多联机10还包括冷媒控制系统16，用于控制冷媒在各个室外机12之间的分配。冷媒控制系统16可以包括设置于各个室外机12的温度传感器及多联机的控制系统(图未示)。
请参阅图2，本发明较佳实施方式的冷媒控制方法可以由冷媒控制系统16实现，并包括以下步骤：
S1：在制热模式中，比较每台室外机12的过热度与多台室外机12的平均过热度；
S2：若当前室外机12的过热度Tsh相对于平均过热度Ta过高则增加进入当前室外机12的冷媒量；及
S3：若当前室外机12的过热度Tsh相对于平均过热度Ta过低则减少进入当前室外机12的冷媒量。
本发明较佳实施方式的冷媒控制系统及方法，进入每台室外机12的冷媒量由当前室外机12的过热度与平均过热度(系统)比较决定，从系统整体角度来调节进入每台室外机12的冷媒量，能使压缩机122处于良好的运行范围，从而避免出现因压缩机122过热度过高或不足导致的问题，提高多联机10运行的可靠性。
本实施方式中，在步骤S1中，室外机12的过热度为室外机12的压缩机122过热度。在其他实施方式中，室外机12的过热度也可以是室外机12的换热器124的出口处的过热度。
步骤S1可以由冷媒控制系统16实现，具体的，冷媒控制系统16的温度传感器测量各种所需温度(例如各个压缩机122的排气管的温度)，然后控制系统根据温度计算出各个室外机12的过热度Tsh及平均过热度Ta，再进行比较。也即是说，在步骤S1中，实际上还包括测量温度及计算各个室外机12的过热度Tsh及平均过热度Ta。
需先说明的是，在本实施方式中，在步骤S2-S3中，当前室外机12是指当前正在控制的室外机12。实际上，本发明较佳实施方式的冷媒控制系统及方法对每台室外机12同时或者按一定的顺序进行控制。
在本实施方式中，在步骤S2中，当前室外机12的过热度Tsh相对于平均过热度Ta过高是指Tsh-Ta>ΔT。在步骤S3中，当前室外机12的过热度Tsh相对于平均过热度Ta过低是指Ta-Tsh>ΔT。步骤S2通过开大当前室外机12的电子膨胀阀126的开度来增加进入当前室外机12的冷媒量。步骤S3通过关小当前室外机12的压缩机122前的电子膨胀阀126的开度来减少进入当前室外机12的冷媒量。
当然，在其他实施方式中，还可以通过其他的方式来判断当前室外机12的过热度 Tsh相对于平均过热度Ta是否过高或过低，并不限于本实施方式。
步骤S2-S3可以由冷媒控制系统16实现，具体的，控制系统比较当前室外机12的过热度Tsh及平均过热度Ta后根据结果控制电子膨胀阀126的开度来调节进入当前室外机12的冷媒量。如此，在冷媒控制系统及方法初始化时需对电子膨胀阀126的开度进行初始化。
因此，本实施方式中，冷媒控制方法还包括：
S0：电子膨胀阀126的开度被初始化至E。
在步骤S2中，开度E增加的幅度为ΔE1，即E+ΔE1。在步骤S3中，开度E减小的幅度也为ΔE1，即E-ΔE1。
可以理解，E、ΔE1的具体数值应该根据实际使用环境及需求而定。
本实施方式中，冷媒控制方法在步骤S2后还包括：
S21：第一预定时间t1后判断当前室外机12的过热度Tsh与平均过热度Ta是否高于预设最大过热度Tmax，若是，进入步骤S22，若否，经第二预定时间t2后返回步骤S1；及
S22：增加进入当前室外机12的冷媒量，经第二预定时间t2后返回步骤S1。
可以理解，若在步骤S2调整后，经第一预定时间t1后，当前室外机12的过热度Tsh及平均过热度Ta高于最大过热度Tmax，则可以判断当前室外机12的冷媒量仍然不足，导致过热度超过预定的最大过热度Tmax，并且连带推高平均过热度Ta，需在步骤S22增加进入当前室外机12的冷媒量。在步骤S22中，开度E增加的幅度为ΔE2，即E+ΔE2。在步骤S22增加进入当前室外机12的冷媒量后经第二预定时间t2的运行后可以重新返回步骤S1继续控制。当然，若未判断到当前室外机12的冷媒量仍然不足，则可以在步骤S21后直接返回步骤S1继续控制。
步骤S21-S22可以由冷媒控制系统16实现。具体的，冷媒控制系统16的温度传感器测量各种所需温度(例如各个压缩机122的排气管的温度)，然后控制系统根据温度计算出当前室外机12的过热度Tsh及平均过热度Ta，再与Tmax进行比较。
可以理解，ΔE2、第一预定时间t1及第二预定时间t2的具体数值应该根据实际使用环境及需求而定，可以相同也可以不同。
本实施方式中，冷媒控制方法在步骤S3后还包括：
S31：第三预定时间t3后判断当前室外机12的过热度Tsh与平均过热度Ta是否低于预设最小过热度Tmin，若是，进入步骤S32，若否，经第四预定时间t4后返回步骤S1；及
S32：减少进入当前室外机12的冷媒量，经第四预定时间t4后返回步骤S1。
可以理解，若在步骤S3调整后，经第三预定时间t3后，当前室外机12的过热度 Tsh及平均过热度Ta高于最小过热度Tmin，则可以判断当前室外机12的冷媒量仍然过多，导致过热度超过预定的最小过热度Tmin，并且连带推低平均过热度Ta，需在步骤S32减少进入当前室外机12的冷媒量。在步骤S32中，开度E减小的幅度也为ΔE2，即E-ΔE2。在步骤S32减少进入当前室外机12的冷媒量后经第四预定时间t4的运行后可以重新返回步骤S1继续控制。当然，若未判断到当前室外机12的冷媒量仍然不足，则可以在步骤S31后直接返回步骤S1继续控制。
步骤S31-S32可以由冷媒控制系统16实现。具体的，冷媒控制系统16的温度传感器测量各种所需温度(例如各个压缩机122的排气管的温度)，然后控制系统根据温度计算出当前室外机12的过热度Tsh及平均过热度Ta，再与Tmin进行比较。
本实施方式中，若当前室外机12的过热度Tsh相对于平均过热度Ta未过高也未过低，即Tsh-Ta>ΔT及Ta-Tsh>ΔT都不成立，则冷媒控制方法还包括：
S4：若当前室外机12的过热度Tsh相对于平均过热度Ta未过高或过低则判断平均过热度Ta是否大于预定最大过热度Tmax；
S5：若是则增加进入当前室外机12的冷媒量，经第五预定时间t5后返回步骤S1；
S6：若否，则判断平均过热度Ta是否小于预定最小过热度Tmin；
S7：若是，则减少进入当前室外机12的冷媒量，经第六预定时间t6后返回步骤S1；
S8：若否，维持进入当前室外机12的冷媒量不变。
可以理解，增加步骤S4-S8是为了防止并非系统整体过热度过高或者过低，在此情况下，即使单个室外机12的过热度无法与系统比较后判断出是否过热度过高或过低，仍需根据系统的过热度对当前室外机12的冷媒量做出控制。即若在步骤S4中判断系统过热度过高，大于最大过热度Tmax，则在步骤S5中增加当前室外机12的冷媒量并经第五预定时间t5后返回步骤S1继续控制，否则在步骤S4进入步骤S5判断系统过热度过低，小于最小过热度Tmin，则在步骤S7减少进入当前室外机12的冷媒量并经第六预定时间t6返回步骤S1继续控制，否则，则证明系统过热度也正常，开度保持不变。
在步骤S5中，开度E增加的幅度为ΔE2，即E+ΔE2。在步骤S8中，开度E减小的幅度也为ΔE2，即E-ΔE2。
步骤S4-S8可以由冷媒控制系统16实现。具体的，冷媒控制系统16的温度传感器测量各种所需温度(例如各个压缩机122的排气管的温度)，然后控制系统根据温度计算出平均过热度Ta，再与最大过热度Tmax及最小过热度Tmin进行比较。
可以理解，第一预定时间t1、第二预定时间t2、第三预定时间t3、第四预定时间t4、第五预定时间t5及第六预定时间t6可以相同或不同。ΔE1与ΔE2也可以相同或不同。
在本发明的实施方式的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、 “竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明的实施方式和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的实施方式的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的实施方式的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明的实施方式的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明的实施方式中的具体含义。
在本发明的实施方式中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的实施方式的不同结构。为了简化本发明的实施方式的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明的实施方式可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明的实施方式提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
在本说明书的描述中，参考术语“一个实施方式”、“一些实施方式”、“示意性实施方式”、“示例”、“具体示例”或“一些示例”等的描述意指结合所述实施方式或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为，表示包括一个或更多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分，并且本发明的优选实施方式的范围包括另外的实现，其中可以不按所示出或讨论的顺序，包括根据所涉及的功能按基本同时的方式或按相反的顺序，来执行功能，这应被本发明的实施例所属技术领域的技术人员所理解。
在流程图中表示或在此以其他方式描述的逻辑和/或步骤，例如，可以被认为是用于实现逻辑功能的可执行指令的定序列表，可以具体实现在任何计算机可读介质中，以供指令执行系统、装置或设备(如基于计算机的系统、包括处理器的系统或其他可以从指令执行系统、装置或设备取指令并执行指令的系统)使用，或结合这些指令执行系统、装置或设备而使用。就本说明书而言，"计算机可读介质"可以是任何可以包含、存储、通信、传播或传输程序以供指令执行系统、装置或设备或结合这些指令执行系统、装置或设备而使用的装置。计算机可读介质的更具体的示例(非穷尽性列表)包括以下：具有一个或多个布线的电连接部(电子装置)，便携式计算机盘盒(磁装置)，随机存取存储器(RAM)，只读存储器(ROM)，可擦除可编辑只读存储器(EPROM或闪速存储器)，光纤装置，以及便携式光盘只读存储器(CDROM)。另外，计算机可读介质甚至可以是可在其上打印所述程序的纸或其他合适的介质，因为可以例如通过对纸或其他介质进行光学扫描，接着进行编辑、解译或必要时以其他合适方式进行处理来以电子方式获得所述程序，然后将其存储在计算机存储器中。
应当理解，本发明的实施方式的各部分可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执行系统执行的软件或固件来实现。例如，如果用硬件来实现，和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现场可编程门阵列(FPGA)等。
本技术领域的普通技术人员可以理解实现上述实施例方法携带的全部或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，该程序在执行时，包括方法实施例的步骤之一或其组合。
此外，在本发明的各个实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。
上述提到的存储介质可以是只读存储器，磁盘或光盘等。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (7)

  1. 一种并联多联机的冷媒控制方法，其特征在于，包括：
    S1：在制热模式中，比较所述多联机的每台室外机的过热度与多台所述室外机的平均过热度；
    S2：若当前所述室外机的过热度相对于所述平均过热度过高则增加进入当前所述室外机的冷媒量；及
    S3：若当前所述室外机的过热度相对于所述平均过热度过低则减少进入当前所述室外机的冷媒量。
  2. 如权利要求1所述的并联多联机的冷媒控制方法，其特征在于，所述室外机的过热度为所述室外机的压缩机过热度或者所述室外机的换热器的出口处的过热度。
  3. 如权利要求1所述的并联多联机的冷媒控制方法，其特征在于，当前所述室外机的过热度相对于所述平均过热度过高是指当前所述室外机的过热度大于所述平均过热度预定幅度；当前所述室外机的过热度相对于所述平均过热度过低是指当前所述室外机的过热度小于所述平均过热度所述预定幅度。
  4. 如权利要求1所述的并联多联机的冷媒控制方法，其特征在于，所述步骤S2通过开大当前所述室外机的压缩机前的电子膨胀阀的开度来增加进入当前所述室外机的冷媒量；所述步骤S3通过关小当前所述室外机的压缩机前的电子膨胀阀的开度来减少进入当前所述室外机的冷媒量。
  5. 如权利要求1所述的并联多联机的冷媒控制方法，其特征在于，所述冷媒控制方法在所述步骤S2后还包括：
    S21：第一预定时间后判断当前所述室外机的过热度与所述平均过热度是否高于预设最大过热度；若是则进入步骤S22，若否，则经所述第二预定时间后返回所述步骤S1；及
    S22：若是，则增加进入当前所述室外机的冷媒量，经第二预定时间后返回所述步骤S1。
  6. 如权利要求1所述的并联多联机的冷媒控制方法，其特征在于，所述冷媒控制方法在所述步骤S3后还包括：
    S31：第三预定时间后判断当前所述室外机的过热度与所述平均过热度是否低于预设最小过热度，若是则进入步骤S32，若否，则经所述第四预定时间后返回所述步骤S1；及
    S32：若是，则减少进入当前所述室外机的冷媒量，经第四预定时间后返回所述步骤S1。
  7. 如权利要求1所述的并联多联机的冷媒控制方法，其特征在于，所述冷媒控制方法还包括：
    S4：若当前所述室外机的过热度相对于所述平均过热度未过高或过低则判断所述平均过热度是否大于预定最大过热度；
    S5：若是则增加进入当前所述室外机的冷媒量，经第五预定时间后返回所述步骤S1；
    S6：若否，则判断所述平均过热度是否小于预定最小过热度；
    S7：若是，则减少进入当前所述室外机的冷媒量，经第六预定时间后返回所述步骤S1；
    S8：若否，维持进入当前所述室外机的冷媒量不变。
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