WO2017202198A1 - 多联机系统及其制热节流元件的控制方法 - Google Patents

多联机系统及其制热节流元件的控制方法 Download PDF

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Publication number
WO2017202198A1
WO2017202198A1 PCT/CN2017/083654 CN2017083654W WO2017202198A1 WO 2017202198 A1 WO2017202198 A1 WO 2017202198A1 CN 2017083654 W CN2017083654 W CN 2017083654W WO 2017202198 A1 WO2017202198 A1 WO 2017202198A1
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WIPO (PCT)
Prior art keywords
compressor
pressure
heating
pressure difference
target
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Ceased
Application number
PCT/CN2017/083654
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English (en)
French (fr)
Inventor
罗彬�
李元阳
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
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Publication date
Application filed by Midea Group Co Ltd, GD Midea Heating and Ventilating Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to EP17802044.2A priority Critical patent/EP3467390B1/en
Publication of WO2017202198A1 publication Critical patent/WO2017202198A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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
    • 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
    • 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—Component parts or details not otherwise provided for in this subclass
    • 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

Definitions

  • the invention relates to the technical field of air conditioners, in particular to a control method of a heating throttling element in a multi-line system and a multi-line system.
  • the multi-line system has four modes: pure cooling, pure heating, main cooling, and main heating.
  • the main cooling mode and the main heating mode can simultaneously utilize the system's condensation heat and evaporation heat to achieve simultaneous cooling and heating, which greatly improves the system energy efficiency.
  • the high-pressure gas of the high-pressure pipe of the outdoor unit enters the heating indoor unit, and after the heating indoor unit releases heat, it expands into a low-pressure gas through the electronic expansion valve and returns to the outdoor unit.
  • the opening degree of the electronic expansion valve will affect the flow rate of the refrigerant entering the heating indoor unit, and also adjust the condensation temperature of the heating indoor unit. The proper opening degree will make the heating indoor unit have both higher refrigerant flow rate and also Higher condensation temperature, which results in higher heat production.
  • an object of the present invention is to provide a control method for a heating throttling element in a multi-line system, which adjusts the opening degree of the heating throttling element by the pressure difference between the high and medium pressures of the flow dividing device, so as to
  • the on-line system not only meets the liquid discharge requirements, but also has good performance and energy efficiency during heating, especially during partial load heating, and improves the user experience.
  • Another object of the present invention is to provide a non-transitory computer readable storage medium.
  • Yet another object of the present invention is to provide a multi-line system.
  • an embodiment of the present invention provides a method for controlling a heating throttle element in a multi-line system, the multi-line system including an outdoor unit, a flow dividing device, and a plurality of indoor units, the outdoor unit including a compressor, the flow dividing device comprising a first heat exchanger, a second heat exchanger and a heating throttle element, an outlet of the first heat exchange flow path of the first heat exchanger and the second heat exchanger An inlet of the first heat exchange passage is in communication, and an outlet of the second heat exchange passage of the second heat exchanger is in communication with an inlet of the second heat exchange passage of the first heat exchanger, A heating throttling element is disposed between an outlet of the first heat exchange passage of the second heat exchanger and an inlet of the second heat exchange passage of the second heat exchanger, the method comprising the steps of: Obtaining a target exhaust pressure of the compressor or a saturation temperature corresponding to the target exhaust pressure; controlling the compressor according to the target exhaust pressure or a saturation temperature corresponding to the target exhaust
  • the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure is acquired, and then corresponding to the target exhaust pressure or the target exhaust pressure.
  • the saturation temperature controls the compressor to stabilize the compressor, and obtains the high pressure and medium pressure of the flow dividing device after the compressor is stably operated, and calculates the pressure difference between the high pressure and the medium pressure, and finally obtains
  • the target pressure difference between the high pressure and the medium pressure of the flow dividing device, and the opening of the heating throttle element is adjusted according to the pressure difference and the target pressure difference, so that the multi-line system is heated, especially It is a part load heating system that not only meets the liquid discharge requirements, but also has good performance and energy efficiency to improve the user experience.
  • adjusting the opening degree of the heating and throttling element according to the pressure difference value and the target pressure difference value comprising: if the pressure difference value is greater than the target pressure difference value And controlling the opening degree of the heating and throttling element; if the pressure difference is smaller than the target pressure difference, the opening degree of the heating and throttling element is controlled.
  • the method further includes: determining whether the pressure difference value is equal to the target pressure difference value, and determining the current state of the compressor Whether the saturation temperature corresponding to the exhaust pressure is greater than or equal to a saturation temperature corresponding to the target exhaust pressure of the compressor, and determining whether the operating frequency of the compressor is greater than or equal to the maximum frequency; if the pressure difference is equal to the target pressure
  • the difference, or the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than or equal to a saturation temperature corresponding to the target exhaust pressure of the compressor, or the operating frequency of the compressor is greater than or equal to the maximum frequency, then controlling The opening of the heating and throttling element remains unchanged.
  • the saturation temperature corresponding to the current exhaust pressure of the compressor is less than the saturation temperature corresponding to the target exhaust pressure of the compressor.
  • the operating frequency of the compressor is less than the maximum frequency, the operating frequency of the compressor is adjusted, and the opening degree of the heating and throttling element is adjusted according to the adjusted operating frequency of the compressor .
  • the multi-line system operates in a heating mode, a main heating mode or a main cooling mode.
  • the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program, the program being implemented by the processor to implement the control method of the heating throttling element in the multi-line system described above .
  • the non-transitory computer readable storage medium of the embodiment of the present invention adjusts the heating throttling element according to the pressure difference between the high and medium pressures of the flow dividing device by performing the above-described control method of the heating throttling element in the multi-line system
  • the degree of opening is such that when the multi-line system is heated, especially when partially loaded, it can meet the liquid discharge requirements, has good performance and energy efficiency, and improves the user experience.
  • another embodiment of the present invention provides a multi-line system, including: an outdoor unit, the outdoor unit includes a compressor, a plurality of indoor units, a flow dividing device, and the flow dividing device includes a first heat exchange a second heat exchanger and a heating and throttling element, wherein an outlet of the first heat exchange passage of the first heat exchanger is in communication with an inlet of the first heat exchange passage of the second heat exchanger, An outlet of the second heat exchange passage of the second heat exchanger is in communication with an inlet of the second heat exchange passage of the first heat exchanger, and the heating throttle element is disposed at the second exchange Between the outlet of the first heat exchange flow path of the heat exchanger and the inlet of the second heat exchange flow path of the second heat exchanger; a control module for obtaining a target exhaust pressure of the compressor Or the saturation temperature corresponding to the target exhaust pressure, and controlling the compressor according to the target exhaust pressure or a saturation temperature corresponding to the target exhaust pressure to stabilize the compressor, and Obtaining the high
  • the control module first acquires the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure, and performs the compressor on the compressor according to the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure. Control to stabilize the compressor and obtain the high pressure and medium pressure of the flow dividing device after the compressor is stably operated. Then, the control module calculates the pressure difference between the high pressure and the medium pressure, and obtains the high pressure of the flow dividing device.
  • the target pressure difference between the pressure and the medium pressure, and the opening of the heating throttle element according to the pressure difference and the target pressure difference so that the multi-line system is heated, especially the partial load system When it is hot, it can meet the drainage requirements, but also has good performance and energy efficiency.
  • the control module adjusts the opening degree of the heating and throttling element according to the pressure difference value and the target pressure difference value, wherein if the pressure difference is greater than Determining the target pressure difference, the control module performing a small control on the opening of the heating throttle element; if the pressure difference is less than the target pressure difference, the control module is The opening of the thermal throttling element is controlled by an increase.
  • the control module further determines whether the pressure difference is equal to the target pressure difference, and determines the compression. Whether the saturation temperature corresponding to the current exhaust pressure of the machine is greater than or equal to a saturation temperature corresponding to the target exhaust pressure of the compressor, and determining whether the operating frequency of the compressor is greater than or equal to the maximum frequency, and the pressure difference is equal to The target pressure difference, or a saturation temperature corresponding to a current exhaust pressure of the compressor, is greater than or equal to a saturation temperature corresponding to a target exhaust pressure of the compressor, or an operating frequency of the compressor is greater than or equal to the maximum At the frequency, the opening of the heating and throttling element is controlled to remain unchanged.
  • the saturation temperature corresponding to the current exhaust pressure of the compressor is less than the saturation temperature corresponding to the target exhaust pressure of the compressor.
  • the operating frequency of the compressor is less than the maximum frequency, and the control module adjusts the operating frequency of the compressor, and adjusts the opening degree of the heating and throttling element according to the adjusted operating frequency of the compressor.
  • the multi-line system operates in a heating mode, a main heating mode or a main cooling mode.
  • FIG. 1 is a block diagram showing the structure of a multi-line system according to an embodiment of the present invention.
  • FIG. 2 is a flow chart of a method of controlling a heating throttle element in a multiple-line system in accordance with an embodiment of the present invention.
  • FIG. 3 is a flow chart of a method of controlling a heating throttle element in a multiple-line system in accordance with one embodiment of the present invention.
  • outdoor unit 10 a plurality of indoor units 20, a flow dividing device 30, a gas-liquid separator 31, a first heat exchanger 32, a second heat exchanger 33, a first throttle element 34, and a heating throttle element 35.
  • the multi-line system includes an outdoor unit, a flow dividing device, and a plurality of indoor units
  • the outdoor unit includes a compressor
  • the flow dividing device includes a first heat exchanger, a second heat exchanger, and a heating throttle element.
  • An outlet of the first heat exchange passage of the first heat exchanger is in communication with an inlet of the first heat exchange passage of the second heat exchanger, and an outlet of the second heat exchange passage of the second heat exchanger is first exchanged
  • An inlet of the second heat exchange passage of the heat exchanger is in communication
  • the heating throttle element is disposed at an inlet of the first heat exchange passage of the second heat exchanger and an inlet of the second heat exchange passage of the second heat exchanger between.
  • the multi-line system includes an outdoor unit 10 , a plurality of indoor units 20 , and a flow dividing device 30 .
  • the outdoor unit 10 includes a compressor (not specifically shown), and the flow dividing device 30 includes gas and liquid.
  • the separator 31 the first heat exchanger 32, the second heat exchanger 33, the first throttle element 34, and the heating throttle element 35.
  • the first end of the gas-liquid separator 31 is connected to one end of the outdoor unit 10.
  • the second end of the gas-liquid separator 31 is in communication with the inlet of the first heat exchange passage of the first heat exchanger 32, and the first throttle element 34 is disposed at the first heat exchange passage of the first heat exchanger 32.
  • the outlet is between the inlet of the first heat exchange passage of the second heat exchanger 33.
  • the heating throttle element 35 is disposed between the outlet of the first heat exchange passage of the second heat exchanger 33 and the inlet of the second heat exchange passage of the second heat exchanger 33, and the second heat exchanger 33
  • the outlet of the second heat exchange flow path is in communication with the inlet of the second heat exchange flow path of the first heat exchanger 32, and the outlet of the second heat exchange flow path of the first heat exchanger 32 is respectively connected to the other end of the outdoor unit 10
  • One end of the refrigeration indoor unit is connected.
  • Refrigeration indoor unit The other end is in communication with the outlet of the first heat exchange path of the second heat exchanger 33, and the third end of the gas-liquid separator 31 is connected to one end of the heating indoor unit, and the other end of the heating indoor unit is second
  • the inlets of the first heat exchange passages of the heat exchanger 33 are in communication.
  • the first throttle element and the heating throttle element may be electronic expansion valves, and the first heat exchanger and the second heat exchanger may be plate heat exchangers.
  • Tps2 is the middle of the diverting device
  • the opening degree of the heating throttling element is too large, the pressure difference between the inlet and outlet of the heating indoor unit will become large, and the flow rate and flow rate of the refrigerant entering the heating indoor unit will increase, although the heating indoor unit at this time
  • the liquid storage is not easy to occur, but the outlet supercooling degree of the heating indoor unit is too small, and the pre-chamber subcooling degree SCm2 of the heating and throttling element is too small, and there may be gas in front of the valve, resulting in system instability.
  • the opening of the heating throttling element is too large, which will cause the operating frequency of the compressor to increase, the energy efficiency of the system to be lowered, and the high pressure may not rise, and the exhaust superheat of the compressor may be relatively low.
  • the heating element does not have liquid accumulation, the opening of the heating throttling element is relatively small. At this time, the exhaust superheat of the compressor is relatively high, the high pressure is relatively high, and the operating frequency of the compressor is relatively low.
  • FIG. 2 is a flow chart of a method of controlling a heating throttle element in a multiple-line system in accordance with an embodiment of the present invention. As shown in FIG. 2, the control method of the heating throttling element in the multi-line system includes the following steps:
  • the exhaust pressure Pc of the compressor is obtained in real time through a pressure sensor disposed at an exhaust port of the compressor, or is acquired After the exhaust pressure Pc of the compressor, the saturation temperature Tc corresponding to the exhaust pressure is acquired based on the exhaust pressure Pc. Then, according to the exhaust pressure Pc of the compressor (or the saturation temperature Tc corresponding to the exhaust pressure) and the target exhaust pressure Pcs (or the target exhaust pressure) The difference between the saturation temperatures Tcs) is PI (Proportional Integral) adjustment of the operating frequency of the compressor to obtain the new compressor discharge pressure Pc (or exhaust pressure) after the compressor is stably operated.
  • PI Proportional Integral
  • the high pressure Ps1 can be obtained by a pressure sensor disposed at the outlet of the first heat exchange path of the first heat exchanger of the flow dividing device, and the medium pressure Ps2 can be passed through the first change of the second heat exchanger. Pressure sensor detection at the inlet of the heat flow path is obtained.
  • the target pressure difference ⁇ Ps is the pressure difference between the high pressure and the medium pressure of the flow dividing device obtained by the experimental verification, and the target pressure difference ⁇ Ps is generally small. It can guarantee the system refrigerant flow rate and meet the high pressure value.
  • the opening of the heating throttle element is adjusted according to the pressure difference value and the target pressure difference, including: if the pressure difference is greater than the target pressure difference, opening the heating throttle element The degree is controlled by the small adjustment; if the pressure difference is smaller than the target pressure difference, the opening degree of the heating throttle element is controlled.
  • the heating throttle is performed on the premise that the compressor is adjusted to obtain the exhaust pressure Pc of the new compressor (or the saturation temperature Tc corresponding to the exhaust pressure), and the high pressure Ps1 and the intermediate pressure Ps2. From the initial opening degree, the element performs PI adjustment based on the pressure difference ⁇ P between the high pressure pressure Ps1 and the intermediate pressure Ps2 and the target pressure difference ⁇ Ps.
  • ⁇ P ⁇ ⁇ Ps the opening degree of the heating throttle element is increased, and at this time, the exhaust pressure Pc of the compressor (or the saturation temperature Tc corresponding to the exhaust pressure) is lowered, and ⁇ P is increased due to an increase in the flow rate.
  • the method further comprises: determining whether the pressure difference is equal to the target pressure difference, and determining whether the saturation temperature corresponding to the current exhaust pressure of the compressor is And greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, and determining whether the operating frequency of the compressor is greater than or equal to the maximum frequency; if the pressure difference is equal to the target pressure difference, or the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than When the saturation temperature corresponding to the target exhaust pressure of the compressor is equal, or the operating frequency of the compressor is greater than or equal to the maximum frequency, the opening of the control heating throttle element remains unchanged.
  • the saturation temperature corresponding to the current exhaust pressure of the compressor is less than the saturation temperature corresponding to the target exhaust pressure of the compressor, and the operating frequency of the compressor is less than the maximum frequency, then the compressor The operating frequency is adjusted, and the opening of the heating throttle element is adjusted according to the adjusted operating frequency of the compressor.
  • FIG. 3 is a flowchart of a method of controlling a heating throttle element in a multiple-line system according to a specific example of the present invention.
  • control method of the heating throttling element in the multi-line system may include the following steps:
  • the operating frequency of the compressor is adjusted according to the difference between the exhaust pressure Pc (or the saturation temperature Tc corresponding to the exhaust pressure) and the target exhaust pressure Pcs (or the saturation temperature Tcs corresponding to the target exhaust pressure).
  • a new exhaust pressure Pc (or a saturation temperature Tc corresponding to the exhaust pressure), a high pressure Ps1, and a medium pressure Ps2 are obtained.
  • the heating throttling element is stabilized at the opening, and the system is stable.
  • control method of the heating throttling element in the multi-line system first acquires the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure, and then according to the target exhaust pressure or The saturation temperature corresponding to the target exhaust pressure controls the compressor to stabilize the compressor, and obtains the high pressure and medium pressure of the flow dividing device after the compressor is stably operated, and calculates the pressure between the high pressure and the medium pressure.
  • the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program that, when executed by the processor, implements the control method of the heating throttling element in the multi-line system described above.
  • the non-transitory computer readable storage medium of the embodiment of the present invention adjusts the heating throttling element according to the pressure difference between the high and medium pressures of the flow dividing device by performing the above-described control method of the heating throttling element in the multi-line system
  • the degree of opening is such that when the multi-line system is heated, especially when partially loaded, it can meet the liquid discharge requirements, has good performance and energy efficiency, and improves the user experience.
  • the multi-line system includes an outdoor unit 10, a plurality of indoor units 20, a flow dividing device 30, and a control module (not specifically shown in the drawings).
  • the outdoor unit 10 includes a compressor (not specifically shown), and the flow dividing device 30 includes a first heat exchanger 32, a second heat exchanger 33 and a heating and throttling element 35, the outlet of the first heat exchange passage of the first heat exchanger 32 is in communication with the inlet of the first heat exchange passage of the second heat exchanger 33, and the second exchange
  • the outlet of the second heat exchange passage of the heat exchanger 33 is in communication with the inlet of the second heat exchange passage of the first heat exchanger 32, and the first heat exchange of the heating throttle element 35 at the second heat exchanger 33 is provided.
  • the outlet of the flow path is between the inlet of the second heat exchange flow path of the second heat exchanger 33.
  • control module configured to acquire a target exhaust pressure of the compressor or a saturation temperature corresponding to the target exhaust pressure, and control the compressor according to the target exhaust pressure or a saturation temperature corresponding to the target exhaust pressure to stabilize the compressor Running, and obtaining the high pressure and the intermediate pressure of the flow dividing device 30 after the compressor is stably operated, the control module calculates the pressure difference between the high pressure and the medium pressure, and obtains the high pressure and the medium pressure of the flow dividing device 30.
  • the target pressure difference between the two, and the opening of the heating and throttling element 35 are adjusted according to the pressure difference and the target pressure difference.
  • the target pressure difference is obtained by experimental verification to obtain a pressure difference between the high pressure and the medium pressure of the flow dividing device in the absence of liquid accumulation, and the target pressure difference is generally small to ensure system refrigerant flow. And meet the value of high pressure.
  • the control module adjusts the opening degree of the heating throttle element according to the pressure difference value and the target pressure difference, wherein if the pressure difference is greater than the target pressure difference, the control module controls the heating The opening degree of the throttle element 35 is controlled to be small; if the pressure difference is smaller than the target pressure difference, the control module controls the opening of the heating throttle element 35 to be increased.
  • the control module when the multi-line system heating (including the multi-line system operating in the heating mode, the main heating mode, or the main cooling mode), especially under partial load heating, the control module first passes through the exhaust gas disposed in the compressor.
  • the pressure sensor at the mouth acquires the exhaust pressure Pc of the compressor in real time, or acquires the saturation temperature Tc corresponding to the exhaust pressure based on the exhaust pressure Pc after acquiring the exhaust pressure Pc of the compressor.
  • the control module compares the difference between the exhaust pressure Pc of the compressor (or the saturation temperature Tc corresponding to the exhaust pressure) and the target exhaust pressure Pcs (or the saturation temperature Tcs corresponding to the target exhaust pressure) to the compressor.
  • the operating frequency is subjected to PI adjustment to obtain a new compressor discharge pressure Pc (or a saturation temperature Tc corresponding to the exhaust pressure), and a high pressure pressure Ps1 and an intermediate pressure Ps2 of the flow dividing device 30 after the compressor is stably operated.
  • the high pressure Ps1 can be detected by a pressure sensor disposed at the outlet of the first heat exchange path of the first heat exchanger 32 of the flow dividing device 30, and the medium pressure Ps2 can be passed through the second heat exchanger 33.
  • a pressure sensor at the inlet of the first heat exchange flow path is detected.
  • the control module Under the premise that the compressor is adjusted to obtain the exhaust pressure Pc of the new compressor (or the saturation temperature Tc corresponding to the exhaust pressure), and the high pressure pressure Ps1 and the intermediate pressure Ps2, the control module according to the high pressure Ps1 and the middle
  • the pressure difference ⁇ P between the pressures Ps2 and the target pressure difference ⁇ Ps are PI-adjusted from the initial opening degree by the heating throttle element 35.
  • the control module controls the opening degree of the heating throttle element 35 to be small, at which time the exhaust pressure Pc of the compressor (or the saturation temperature Tc corresponding to the exhaust pressure) rises, and the flow rate decreases, ⁇ P become smaller.
  • the control module controls the opening degree of the heating throttle element 35 to be large, at which time the discharge pressure Pc of the compressor (or the saturation temperature Tc corresponding to the exhaust pressure) is decreased, and ⁇ P is increased due to the flow rate. Become bigger.
  • the control module after the control module adjusts the opening degree of the heating throttle element 35, it also determines Determining whether the pressure difference is equal to the target pressure difference, and determining whether the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, and determining whether the operating frequency of the compressor is greater than or equal to the maximum Frequency, and when the pressure difference is equal to the target pressure difference, or the saturation temperature corresponding to the current exhaust pressure of the compressor is greater than or equal to the saturation temperature corresponding to the target exhaust pressure of the compressor, or the operating frequency of the compressor is greater than or equal to the maximum frequency
  • the opening of the control heating throttle element 35 remains unchanged.
  • the control module compresses The operating frequency of the machine is adjusted, and the opening degree of the heating throttle element 35 is adjusted according to the operating frequency of the adjusted compressor.
  • the control module first acquires the target exhaust pressure of the compressor or the saturation temperature corresponding to the target exhaust pressure, and performs the compressor on the compressor according to the target exhaust pressure or the saturation temperature corresponding to the target exhaust pressure. Control to stabilize the compressor and obtain the high pressure and medium pressure of the flow dividing device after the compressor is stably operated. Then, the control module calculates the pressure difference between the high pressure and the medium pressure, and obtains the high pressure of the flow dividing device.
  • the target pressure difference between the pressure and the medium pressure, and the opening of the heating throttle element according to the pressure difference and the target pressure difference so that the multi-line system is heated, especially the partial load system When it is hot, it can meet the drainage requirements, but also has good performance and energy efficiency.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • 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 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 and in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: discrete with logic gates for implementing logic functions on data signals Logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), and the like.

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Abstract

一种多联机系统中制热节流元件（35）的控制方法，包括以下步骤：获取压缩机的目标排气压力或者目标排气压力对应的饱和温度（S1）；根据目标排气压力或者目标排气压力对应的饱和温度对压缩机进行控制以使压缩机稳定运行，并在压缩机稳定运行后获取分流装置（30）的高压压力和中压压力，以及计算高压压力与中压压力之间的压力差值（S2）；以及获取分流装置（30）的高压压力与中压压力之间的目标压力差值，并根据压力差值和目标压力差值对制热节流元件（35）的开度进行调节（S3）。另外还公开了一种应用了该制热节流元件（35）控制方法的多联机系统。

Description

多联机系统及其制热节流元件的控制方法 技术领域
本发明涉及空调技术领域，特别涉及一种多联机系统中制热节流元件的控制方法以及一种多联机系统。
背景技术
多联机系统具有纯制冷、纯制热、主制冷和主制热四种模式。其中，主制冷模式和主制热模式可以同时利用系统的冷凝热和蒸发热，实现同时制冷和制热，大大提高了系统能效。
在多联机系统运行过程中，室外机高压管的高压气进入制热室内机，在制热室内机放热后，通过电子膨胀阀膨胀成低压气体回到室外机。电子膨胀阀的开度会影响进入制热室内机的制冷剂流量，同时也会调节制热室内机的冷凝温度，合适的开度会使制热室内机既具有较高的制冷剂流量同时也有较高的冷凝温度，从而输出更高的制热量。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本发明的一个目的在于提出一种多联机系统中制热节流元件的控制方法，通过分流装置的高中压之间的压力差值调整制热节流元件的开度，以使多联机系统在制热时，尤其是部分负荷制热时，既能满足排液要求，又具有很好的性能和能效，提高用户体验。
本发明的另一个目的在于提出一种非临时性计算机可读存储介质。
本发明的又一个目的在于提出一种多联机系统。
为实现上述目的，本发明一方面实施例提出了一种多联机系统中制热节流元件的控制方法，所述多联机系统包括室外机、分流装置和多个室内机，所述室外机包括压缩机，所述分流装置包括第一换热器、第二换热器和制热节流元件，所述第一换热器的第一换热流路的出口与所述第二换热器的第一换热流路的入口相连通，所述第二换热器的第二换热流路的出口与所述第一换热器的第二换热流路的入口相连通，所述制热节流元件设置在所述第二换热器的第一换热流路的出口与所述第二换热器的第二换热流路的入口之间，所述方法包括以下步骤：获取所述压缩机的目标排气压力或者所述目标排气压力对应的饱和温度；根据所述目标排气压力或者所述目标排气压力对应的饱和温度对所述压缩机进行控制以使所述压缩机稳定运行，并在所述压缩机稳定运行后获取所述分流装置的高压压力和中压压力，以及计算所述高压压力与所述中压压力之间的压力差值；以及获取所述分流装置的高 压压力与中压压力之间的目标压力差值，并根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节。
根据本发明实施例的多联机系统中制热节流元件的控制方法，首先获取压缩机的目标排气压力或者目标排气压力对应的饱和温度，然后根据目标排气压力或者目标排气压力对应的饱和温度对压缩机进行控制以使压缩机稳定运行，并在压缩机稳定运行后获取分流装置的高压压力和中压压力，以及计算高压压力与中压压力之间的压力差值，最后获取分流装置的高压压力与中压压力之间的目标压力差值，并根据压力差值和目标压力差值对制热节流元件的开度进行调节，以使多联机系统在制热时，尤其是部分负荷制热时，既能满足排液要求，又能具有很好的性能和能效，提高用户体验。
根据本发明的一个实施例，根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节，包括：如果所述压力差值大于所述目标压力差值，则对所述制热节流元件的开度进行调小控制；如果所述压力差值小于所述目标压力差值，则对所述制热节流元件的开度进行调大控制。
根据本发明的一个实施例，在对所述制热节流元件的开度进行调节后，还包括：判断所述压力差值是否等于所述目标压力差值，并判断所述压缩机的当前排气压力对应的饱和温度是否大于等于所述压缩机的目标排气压力对应的饱和温度，以及判断所述压缩机的运行频率是否大于等于最大频率；如果所述压力差值等于所述目标压力差值，或者所述压缩机的当前排气压力对应的饱和温度大于等于所述压缩机的目标排气压力对应的饱和温度，或者所述压缩机的运行频率大于等于所述最大频率，则控制所述制热节流元件的开度保持不变。
根据本发明的一个实施例，如果所述压力差值不等于所述目标压力差值、所述压缩机的当前排气压力对应的饱和温度小于所述压缩机的目标排气压力对应的饱和温度、且所述压缩机的运行频率小于所述最大频率，则对所述压缩机的运行频率进行调节，并根据调节后的压缩机的运行频率对所述制热节流元件的开度进行调节。
根据本发明的一个实施例，所述多联机系统工作在制热模式、主制热模式或主制冷模式下。
为实现上述目的，本发明还提供了一种非临时性计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现上述的多联机系统中制热节流元件的控制方法。
本发明实施例的非临时性计算机可读存储介质，通过执行上述的多联机系统中制热节流元件的控制方法，根据分流装置的高中压之间的压力差值调整制热节流元件的开度，以使多联机系统在制热时，尤其是部分负荷制热时，既能满足排液要求，又具有很好的性能和能效，提高用户体验。
为实现上述目的，本发明另一方面实施例提出了一种多联机系统，包括：室外机，所述室外机包括压缩机；多个室内机；分流装置，所述分流装置包括第一换热器、第二换热器和制热节流元件，所述第一换热器的第一换热流路的出口与所述第二换热器的第一换热流路的入口相连通，所述第二换热器的第二换热流路的出口与所述第一换热器的第二换热流路的入口相连通，所述制热节流元件设置在所述第二换热器的第一换热流路的出口与所述第二换热器的第二换热流路的入口之间；控制模块，所述控制模块用于获取所述压缩机的目标排气压力或者所述目标排气压力对应的饱和温度，并根据所述目标排气压力或者所述目标排气压力对应的饱和温度对所述压缩机进行控制以使所述压缩机稳定运行，并在所述压缩机稳定运行后获取所述分流装置的高压压力和中压压力，所述控制模块计算所述高压压力与所述中压压力之间的压力差值，并获取所述分流装置的高压压力与中压压力之间的目标压力差值，以及根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节。
根据本发明实施例的多联机系统，控制模块首先获取压缩机的目标排气压力或者目标排气压力对应的饱和温度，并根据目标排气压力或者目标排气压力对应的饱和温度对压缩机进行控制以使压缩机稳定运行，并在压缩机稳定运行后获取分流装置的高压压力和中压压力，然后，控制模块计算高压压力与中压压力之间的压力差值，并获取分流装置的高压压力与中压压力之间的目标压力差值，以及根据压力差值和目标压力差值对制热节流元件的开度进行调节，以使多联机系统在制热时，尤其是部分负荷制热时，既能满足排液要求，又能具有很好的性能和能效。
根据本发明的一个实施例，所述控制模块根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节时，其中，如果所述压力差值大于所述目标压力差值，所述控制模块则对所述制热节流元件的开度进行调小控制；如果所述压力差值小于所述目标压力差值，所述控制模块则对所述制热节流元件的开度进行调大控制。
根据本发明的一个实施例，所述控制模块在对所述制热节流元件的开度进行调节后，还判断判断所述压力差值是否等于所述目标压力差值，并判断所述压缩机的当前排气压力对应的饱和温度是否大于等于所述压缩机的目标排气压力对应的饱和温度，以及判断所述压缩机的运行频率是否大于等于最大频率，并在所述压力差值等于所述目标压力差值，或者所述压缩机的当前排气压力对应的饱和温度大于等于所述压缩机的目标排气压力对应的饱和温度，或者所述压缩机的运行频率大于等于所述最大频率时，控制所述制热节流元件的开度保持不变。
根据本发明的一个实施例，如果所述压力差值不等于所述目标压力差值、所述压缩机的当前排气压力对应的饱和温度小于所述压缩机的目标排气压力对应的饱和温度、且所述 压缩机的运行频率小于所述最大频率，所述控制模块则对所述压缩机的运行频率进行调节，并根据调节后的压缩机的运行频率对所述制热节流元件的开度进行调节。
根据本发明的一个实施例，所述多联机系统工作在制热模式、主制热模式或主制冷模式下。
附图说明
图1是根据本发明一个实施例的多联机系统的结构示意图。
图2是根据本发明实施例的多联机系统中制热节流元件的控制方法的流程图。
图3是根据本发明一个实施例的多联机系统中制热节流元件的控制方法的流程图。
附图标记：室外机10、多个室内机20、分流装置30、气液分离器31、第一换热器32、第二换热器33、第一节流元件34和制热节流元件35。
具体实施方式
下面详细描述本发明的实施例，所述实施例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例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
下面参照附图来描述根据本发明实施例提出的多联机系统及其制热节流元件的控制方法。
在本发明的实施例中，多联机系统包括室外机、分流装置和多个室内机，室外机包括压缩机，分流装置包括第一换热器、第二换热器和制热节流元件，第一换热器的第一换热流路的出口与第二换热器的第一换热流路的入口相连通，第二换热器的第二换热流路的出口与第一换热器的第二换热流路的入口相连通，制热节流元件设置在第二换热器的第一换热流路的出口与第二换热器的第二换热流路的入口之间。
具体地，如图1所示，多联机系统包括室外机10、多个室内机20、分流装置30，其中，室外机10包括压缩机(图中未具体示出)，分流装置30包括气液分离器31、第一换热器32、第二换热器33、第一节流元件34和制热节流元件35。
气液分离器31的第一端与室外机10的一端相连。气液分离器31的第二端与第一换热器32的第一换热流路的入口相连通，第一节流元件34设置在第一换热器32的第一换热流路的出口与第二换热器33的第一换热流路的入口之间。制热节流元件35设置在第二换热器33的第一换热流路的出口与第二换热器33的第二换热流路的入口之间，第二换热器33的第二换热流路的出口与第一换热器32的第二换热流路的入口相连通，第一换热器32的第二换热流路的出口分别与室外机10的另一端和制冷室内机的一端相连通。制冷室内机的 另一端与第二换热器33的第一换热流路的出口相连通，气液分离器31的第三端与制热室内机的一端相连通，制热室内机的另一端与第二换热器33的第一换热流路的入口相连通。其中，第一节流元件和制热节流元件可以为电子膨胀阀，第一换热器和第二换热器可以为板式换热器。
在多联机系统制热(包括多联机系统以制热模式、主制热模式或主制冷模式运行)时，尤其是部分负荷制热下，如果制热节流元件的开度太小，则将导致制热室内机的进出口压差(即分流装置的高压压力Ps1与中压压力Ps2之间的压力差值ΔP＝Ps1-Ps2)变小，进入制热室内机的制冷剂流量和流速都会减少，此时由于制热室内机所处的室内温度通常较低，制热室内机会发生存液，制热室内机的出风温度就会降低，从而导致制热能力衰减，因此需要采取措施将制热室内机中多余的液体排掉。同时，较小的进出口压差不仅会引起制热室内机过冷度太大，而且会引起制热节流元件的阀前过冷度SCm2＝Tps2-Tm2(其中，Tps2为分流装置的中压压力值对应的饱和温度，即制热节流元件的阀前压力值对应的饱和温度，Tm2为制热节流元件的阀前温度值)比较高。
而如果制热节流元件的开度太大，则将导致制热室内机的进出口压差变大，进入制热室内机的制冷剂流量和流速都会增大，虽然此时制热室内机不容易发生存液，但会导致制热室内机的出口过冷度太小，制热节流元件的阀前过冷度SCm2太小，有可能出现阀前有气体，造成系统不稳定。同时，制热节流元件的开度太大也会造成压缩机的运行频率升高，系统能效降低，且高压有可能升不上去，压缩机的排气过热度有时会比较低。
如果在制热室内机未发生积液的条件下，制热节流元件的开度比较小，此时压缩机的排气过热度会比较高，高压也比较高，压缩机的运行频率比较低，系统能效会很高。因此，通过控制合理的高压压力Ps1与中压压力Ps2之间的压力差值ΔP＝Ps1-Ps2即可使系统既能满足排液要求，又能具有很好的制热和能效表现。
图2是根据本发明实施例的多联机系统中制热节流元件的控制方法的流程图。如图2所示，该多联机系统中制热节流元件的控制方法包括以下步骤：
S1，获取压缩机的目标排气压力或者目标排气压力对应的饱和温度。
S2，根据目标排气压力或者目标排气压力对应的饱和温度对压缩机进行控制以使压缩机稳定运行，并在压缩机稳定运行后获取分流装置的高压压力和中压压力，以及计算高压压力与中压压力之间的压力差值。
具体地，在多联机系统以制热模式、主制热模式或主制冷模式运行时，通过设置在压缩机的排气口处的压力传感器实时获取压缩机的排气压力Pc，或者在获取到压缩机的排气压力Pc后，根据排气压力Pc获取排气压力对应的饱和温度Tc。然后，根据压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)与目标排气压力Pcs(或者目标排气压力对应 的饱和温度Tcs)之间的差值对压缩机的运行频率进行PI(Proportional Integral，比例积分)调节，以在压缩机稳定运行后，获得新的压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)、以及分流装置的高压压力Ps1和中压压力Ps2。其中，高压压力Ps1可通过设置在分流装置的第一换热器的第一换热流路的出口处的压力传感器检测获得，中压压力Ps2可通过设置在第二换热器的第一换热流路的入口处的压力传感器检测获得。
S3，获取分流装置的高压压力与中压压力之间的目标压力差值，并根据压力差值和目标压力差值对制热节流元件的开度进行调节。
需要说明的是，目标压力差值ΔPs是通过实验验证获得的在系统不积液情况下分流装置的高压压力与中压压力之间的压力差值，该目标压力差值ΔPs一般为较小的能够保证系统制冷剂流量，且满足高压的值。
根据本发明的一个实施例，根据压力差值和目标压力差值对制热节流元件的开度进行调节，包括：如果压力差值大于目标压力差值，则对制热节流元件的开度进行调小控制；如果压力差值小于目标压力差值，则对制热节流元件的开度进行调大控制。
也就是说，在对压缩机进行调节以获得新的压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)、以及高压压力Ps1和中压压力Ps2的前提下，制热节流元件从初始开度，根据高压压力Ps1与中压压力Ps2之间的压力差值ΔP和目标压力差值ΔPs进行PI调节。
如果ΔP＞ΔPs，则制热节流元件的开度关小，此时压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)上升，且由于流量减小，ΔP变小。
如果ΔP＜ΔPs，则制热节流元件的开度开大，此时压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)下降，且由于流量增大，ΔP变大。
根据本发明的一个实施例，在对制热节流元件的开度进行调节后，还包括：判断压力差值是否等于目标压力差值，并判断压缩机的当前排气压力对应的饱和温度是否大于等于压缩机的目标排气压力对应的饱和温度，以及判断压缩机的运行频率是否大于等于最大频率；如果压力差值等于目标压力差值，或者压缩机的当前排气压力对应的饱和温度大于等于压缩机的目标排气压力对应的饱和温度，或者压缩机的运行频率大于等于最大频率，则控制制热节流元件的开度保持不变。
如果压力差值不等于目标压力差值、压缩机的当前排气压力对应的饱和温度小于压缩机的目标排气压力对应的饱和温度、且压缩机的运行频率小于最大频率，则对压缩机的运行频率进行调节，并根据调节后的压缩机的运行频率对制热节流元件的开度进行调节。
具体地，在对制热节流元件的开度进行调节后，还判断是否有ΔP＝ΔPs，且Pc≥Pcs(或者Tc≥Tcs)或者压缩机已经满频。如果ΔP＝ΔPs，或者ΔP≠ΔPs但Pc≥Pcs(或者Tc≥Tcs)，或者ΔP≠ΔPs但压缩机已经满频，则控制制热节流元件的开度保持不变；否则，先调整压缩机的运行频率，并重新调整制热节流元件的开度，直到满足上述条件， 表明系统已经达到稳定状态，制热节流元件的开度可以稳定在该开度下，从而保证系统在制热下，尤其是部分负荷制热下，系统的性能和能效可以达到更好。
为使本领域技术人员更清楚地了解本发明，图3是根据本发明一个具体示例的多联机系统中制热节流元件的控制方法的流程图。
如图3所示，多联机系统中制热节流元件的控制方法可包括以下步骤：
S101，制热节流元件的当前开度。
S102，压缩机的运行频率根据排气压力Pc(或排气压力对应的饱和温度Tc)与目标排气压力Pcs(或目标排气压力对应的饱和温度Tcs)之间的差值进行PI调节，以获得新的排气压力Pc(或排气压力对应的饱和温度Tc)、高压压力Ps1和中压压力Ps2。
S103，根据压力差值ΔP与目标压力差值ΔPs之间的差值对制热节流元件的开度进行PI调节。
S104，如果ΔP＞ΔPs，则关小制热节流元件的开度。
S105，如果ΔP＜ΔPs，则开大制热节流元件的开度。
S106，判断是否满足ΔP＝ΔPs，且Pc≥Pcs(或Tc≥Tcs)或压缩机已经满频。如果是，执行步骤S107；如果否，返回步骤S101。
S107，制热节流元件稳定在该开度，系统稳定。
综上所述，根据本发明实施例的多联机系统中制热节流元件的控制方法，首先获取压缩机的目标排气压力或者目标排气压力对应的饱和温度，然后根据目标排气压力或者目标排气压力对应的饱和温度对压缩机进行控制以使压缩机稳定运行，并在压缩机稳定运行后获取分流装置的高压压力和中压压力，以及计算高压压力与中压压力之间的压力差值，最后获取分流装置的高压压力与中压压力之间的目标压力差值，并根据压力差值和目标压力差值对制热节流元件的开度进行快速调节，以使多联机系统在制热时，尤其是部分负荷制热时，既能满足排液要求，又能具有很好的性能和能效，提高用户体验。
另外，本发明还提供了一种非临时性计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现上述的多联机系统中制热节流元件的控制方法。
本发明实施例的非临时性计算机可读存储介质，通过执行上述的多联机系统中制热节流元件的控制方法，根据分流装置的高中压之间的压力差值调整制热节流元件的开度，以使多联机系统在制热时，尤其是部分负荷制热时，既能满足排液要求，又具有很好的性能和能效，提高用户体验。
图1是根据本发明一个实施例的多联机系统的结构示意图。如图1所示，该多联机系统包括：室外机10、多个室内机20、分流装置30和控制模块(图中未具体示出)。
其中，室外机10包括压缩机(图中未具体示出)，分流装置30包括第一换热器32、第 二换热器33和制热节流元件35，第一换热器32的第一换热流路的出口与第二换热器33的第一换热流路的入口相连通，第二换热器33的第二换热流路的出口与第一换热器32的第二换热流路的入口相连通，制热节流元件35设置在第二换热器33的第一换热流路的出口与第二换热器33的第二换热流路的入口之间。
控制模块，控制模块用于获取压缩机的目标排气压力或者目标排气压力对应的饱和温度，并根据目标排气压力或者目标排气压力对应的饱和温度对压缩机进行控制以使压缩机稳定运行，并在压缩机稳定运行后获取分流装置30的高压压力和中压压力，控制模块计算高压压力与中压压力之间的压力差值，并获取分流装置30的高压压力与中压压力之间的目标压力差值，以及根据压力差值和目标压力差值对制热节流元件35的开度进行调节。其中，目标压力差值是通过实验验证获得在系统不积液情况下分流装置的高压压力与中压压力之间的压力差值，该目标压力差值一般为较小的能够保证系统制冷剂流量，且满足高压的值。
根据本发明的一个实施例，控制模块根据压力差值和目标压力差值对制热节流元件的开度进行调节时，其中，如果压力差值大于目标压力差值，控制模块则对制热节流元件35的开度进行调小控制；如果压力差值小于目标压力差值，控制模块则对制热节流元件35的开度进行调大控制。
具体地，在多联机系统制热(包括多联机系统以制热模式、主制热模式或主制冷模式运行)时，尤其是部分负荷制热下，控制模块先通过设置在压缩机的排气口处的压力传感器实时获取压缩机的排气压力Pc，或者在获取到压缩机的排气压力Pc后，根据排气压力Pc获取排气压力对应的饱和温度Tc。然后，控制模块根据压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)与目标排气压力Pcs(或者目标排气压力对应的饱和温度Tcs)之间的差值对压缩机的运行频率进行PI调节，以在压缩机稳定运行后，获得新的压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)、以及分流装置30的高压压力Ps1和中压压力Ps2。其中，高压压力Ps1可通过设置在分流装置30的第一换热器32的第一换热流路的出口处的压力传感器检测获得，中压压力Ps2可通过设置在第二换热器33的第一换热流路的入口处的压力传感器检测获得。
在对压缩机进行调节以获得新的压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)、以及高压压力Ps1和中压压力Ps2的前提下，控制模块根据高压压力Ps1与中压压力Ps2之间的压力差值ΔP和目标压力差值ΔPs对制热节流元件35从初始开度进行PI调节。
如果ΔP＞ΔPs，控制模块则控制制热节流元件35的开度关小，此时压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)上升，且由于流量减小，ΔP变小。
如果ΔP＜ΔPs，控制模块则控制制热节流元件35的开度开大，此时压缩机的排气压力Pc(或者排气压力对应的饱和温度Tc)下降，且由于流量增大，ΔP变大。
根据本发明的一个实施例，控制模块在对制热节流元件35的开度进行调节后，还判断 判断压力差值是否等于目标压力差值，并判断压缩机的当前排气压力对应的饱和温度是否大于等于压缩机的目标排气压力对应的饱和温度，以及判断压缩机的运行频率是否大于等于最大频率，并在压力差值等于目标压力差值，或者压缩机的当前排气压力对应的饱和温度大于等于压缩机的目标排气压力对应的饱和温度，或者压缩机的运行频率大于等于最大频率时，控制制热节流元件35的开度保持不变。
如果压力差值不等于目标压力差值、压缩机的当前排气压力对应的饱和温度小于压缩机的目标排气压力对应的饱和温度、且压缩机的运行频率小于最大频率，控制模块则对压缩机的运行频率进行调节，并根据调节后的压缩机的运行频率对制热节流元件35的开度进行调节。
具体地，控制模块在对制热节流元件35的开度进行调节后，还判断是否有ΔP＝ΔPs，且Pc≥Pcs(或者Tc≥Tcs)或者压缩机已经满频。如果ΔP＝ΔPs，或者ΔP≠ΔPs但Pc≥Pcs(或者Tc≥Tcs)，或者ΔP≠ΔPs但压缩机已经满频，控制模块则控制制热节流元件35的开度保持不变；否则，控制模块先调整压缩机的运行频率，并重新调整制热节流元件35的开度，直到满足上述条件，表明系统已经达到稳定状态，制热节流元件35的开度可以稳定在该开度下，从而保证系统在制热下，尤其是部分负荷制热下，系统的性能和能效可以达到更好。
根据本发明实施例的多联机系统，控制模块首先获取压缩机的目标排气压力或者目标排气压力对应的饱和温度，并根据目标排气压力或者目标排气压力对应的饱和温度对压缩机进行控制以使压缩机稳定运行，并在压缩机稳定运行后获取分流装置的高压压力和中压压力，然后，控制模块计算高压压力与中压压力之间的压力差值，并获取分流装置的高压压力与中压压力之间的目标压力差值，以及根据压力差值和目标压力差值对制热节流元件的开度进行调节，以使多联机系统在制热时，尤其是部分负荷制热时，既能满足排液要求，又能具有很好的性能和能效。
在本发明的描述中，需要理解的是，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至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；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，除非另有明确的限定。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中的具体含义。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例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例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
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定制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。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。
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。

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  1. 一种多联机系统中制热节流元件的控制方法，其特征在于，所述多联机系统包括室外机、分流装置和多个室内机，所述室外机包括压缩机，所述分流装置包括第一换热器、第二换热器和制热节流元件，所述第一换热器的第一换热流路的出口与所述第二换热器的第一换热流路的入口相连通，所述第二换热器的第二换热流路的出口与所述第一换热器的第二换热流路的入口相连通，所述制热节流元件设置在所述第二换热器的第一换热流路的出口与所述第二换热器的第二换热流路的入口之间，所述方法包括以下步骤：
    获取所述压缩机的目标排气压力或者所述目标排气压力对应的饱和温度；
    根据所述目标排气压力或者所述目标排气压力对应的饱和温度对所述压缩机进行控制以使所述压缩机稳定运行，并在所述压缩机稳定运行后获取所述分流装置的高压压力和中压压力，以及计算所述高压压力与所述中压压力之间的压力差值；以及
    获取所述分流装置的高压压力与中压压力之间的目标压力差值，并根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节。
  2. 根据权利要求1所述的多联机系统中制热节流元件的控制方法，其特征在于，根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节，包括：
    如果所述压力差值大于所述目标压力差值，则对所述制热节流元件的开度进行调小控制；
    如果所述压力差值小于所述目标压力差值，则对所述制热节流元件的开度进行调大控制。
  3. 根据权利要求1或2所述的多联机系统中制热节流元件的控制方法，其特征在于，在对所述制热节流元件的开度进行调节后，还包括：
    判断所述压力差值是否等于所述目标压力差值，并判断所述压缩机的当前排气压力对应的饱和温度是否大于等于所述压缩机的目标排气压力对应的饱和温度，以及判断所述压缩机的运行频率是否大于等于最大频率；
    如果所述压力差值等于所述目标压力差值，或者所述压缩机的当前排气压力对应的饱和温度大于等于所述压缩机的目标排气压力对应的饱和温度，或者所述压缩机的运行频率大于等于所述最大频率，则控制所述制热节流元件的开度保持不变。
  4. 根据权利要求3所述的多联机系统中制热节流元件的控制方法，其特征在于，如果所述压力差值不等于所述目标压力差值、所述压缩机的当前排气压力对应的饱和温度小于所述压缩机的目标排气压力对应的饱和温度、且所述压缩机的运行频率小于所述最大频率，则对所述压缩机的运行频率进行调节，并根据调节后的压缩机的运行频率对所述制热节流 元件的开度进行调节。
  5. 根据权利要求1-4中任一项所述的多联机系统中制热节流元件的控制方法，其特征在于，所述多联机系统工作在制热模式、主制热模式或主制冷模式下。
  6. 一种多联机系统，其特征在于，包括：
    室外机，所述室外机包括压缩机；
    多个室内机；
    分流装置，所述分流装置包括第一换热器、第二换热器和制热节流元件，所述第一换热器的第一换热流路的出口与所述第二换热器的第一换热流路的入口相连通，所述第二换热器的第二换热流路的出口与所述第一换热器的第二换热流路的入口相连通，所述制热节流元件设置在所述第二换热器的第一换热流路的出口与所述第二换热器的第二换热流路的入口之间；
    控制模块，所述控制模块用于获取所述压缩机的目标排气压力或者所述目标排气压力对应的饱和温度，并根据所述目标排气压力或者所述目标排气压力对应的饱和温度对所述压缩机进行控制以使所述压缩机稳定运行，并在所述压缩机稳定运行后获取所述分流装置的高压压力和中压压力，所述控制模块计算所述高压压力与所述中压压力之间的压力差值，并获取所述分流装置的高压压力与中压压力之间的目标压力差值，以及根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节。
  7. 根据权利要求6所述的多联机系统，其特征在于，所述控制模块根据所述压力差值和所述目标压力差值对所述制热节流元件的开度进行调节时，其中，
    如果所述压力差值大于所述目标压力差值，所述控制模块则对所述制热节流元件的开度进行调小控制；
    如果所述压力差值小于所述目标压力差值，所述控制模块则对所述制热节流元件的开度进行调大控制。
  8. 根据权利要求6或7所述的多联机系统，其特征在于，所述控制模块在对所述制热节流元件的开度进行调节后，还判断判断所述压力差值是否等于所述目标压力差值，并判断所述压缩机的当前排气压力对应的饱和温度是否大于等于所述压缩机的目标排气压力对应的饱和温度，以及判断所述压缩机的运行频率是否大于等于最大频率，并在所述压力差值等于所述目标压力差值，或者所述压缩机的当前排气压力对应的饱和温度大于等于所述压缩机的目标排气压力对应的饱和温度，或者所述压缩机的运行频率大于等于所述最大频率时，控制所述制热节流元件的开度保持不变。
  9. 根据权利要求8所述的多联机系统，其特征在于，如果所述压力差值不等于所述目标压力差值、所述压缩机的当前排气压力对应的饱和温度小于所述压缩机的目标排气压力 对应的饱和温度、且所述压缩机的运行频率小于所述最大频率，所述控制模块则对所述压缩机的运行频率进行调节，并根据调节后的压缩机的运行频率对所述制热节流元件的开度进行调节。
  10. 根据权利要求6-9中任一项所述的多联机系统中制热节流元件的控制方法，其特征在于，所述多联机系统工作在制热模式、主制热模式或主制冷模式下。
  11. 一种非临时性计算机可读存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行时实现如权利要求1-5中任一项所述的多联机系统中制热节流元件的控制方法。
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