WO2017185733A1 - 空调系统及其阀体控制方法 - Google Patents

空调系统及其阀体控制方法 Download PDF

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Publication number
WO2017185733A1
WO2017185733A1 PCT/CN2016/107359 CN2016107359W WO2017185733A1 WO 2017185733 A1 WO2017185733 A1 WO 2017185733A1 CN 2016107359 W CN2016107359 W CN 2016107359W WO 2017185733 A1 WO2017185733 A1 WO 2017185733A1
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WO
WIPO (PCT)
Prior art keywords
expansion valve
electronic expansion
conditioning system
air conditioning
subcooling
Prior art date
Application number
PCT/CN2016/107359
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English (en)
French (fr)
Inventor
李元阳
Original Assignee
广东美的暖通设备有限公司
美的集团股份有限公司
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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
Publication of WO2017185733A1 publication Critical patent/WO2017185733A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves

Definitions

  • the invention relates to the field of air conditioning, in particular to an air conditioning system and a valve body control method thereof.
  • Air conditioners are favored by users due to their humidity regulation. However, if the capacity of the outdoor unit of the air conditioner is small and the indoor unit capacity is small, if the opening degree of the electronic expansion valve is too large, the degree of subcooling at the front end of the electronic expansion valve will appear small for a while, so the front end of the electronic expansion valve There is gas for a while and liquid for a while. When the front end of the electronic expansion valve is a gas, the flow of the refrigerant will be blocked, and the flow rate of the refrigerant in the indoor unit will be slowed down; when the front end of the electronic expansion valve is a liquid, the refrigerant in the indoor unit will accelerate the flow. If the opening adjustment of the electronic expansion valve does not match, fluctuations in the air conditioning system may occur.
  • the main object of the present invention is to provide a valve body control method and an air conditioning system for adjusting an air conditioner, aiming at preventing fluctuations of the air conditioning system and making the operation of the air conditioning system more stable.
  • a valve body control method for an air conditioning system includes the following steps:
  • the opening degree of the electronic expansion valve is PI adjusted until the degree of subcooling of the front end of the electronic expansion valve tends to be stable.
  • the step of reducing the opening degree of the electronic expansion valve until the front end of the electronic expansion valve of the air conditioning system re-appears the degree of subcooling includes:
  • the opening of the electronic expansion valve is continuously lowered.
  • the step of reducing the opening degree of the electronic expansion valve until the front end of the electronic expansion valve of the air conditioning system re-appears the degree of subcooling further comprises:
  • Controlling the electronic expansion valve after the reduced opening degree of the electronic expansion valve is a preset minimum opening degree and the front end of the electronic expansion valve is still not subjected to the degree of subcooling after operating at the preset minimum opening degree
  • the opening of the expansion valve is lowered to a new opening value, and the new opening value is lower than the preset minimum opening value, and the process proceeds to step S1.
  • the step of determining whether the front end of the electronic expansion valve of the air conditioning system has no undercooling comprises:
  • the step of determining whether the front end of the electronic expansion valve of the air conditioning system has no undercooling comprises:
  • the step of determining whether the front end of the electronic expansion valve of the air conditioning system has no undercooling comprises:
  • the air conditioning system is in multiple connection, the operating parameters of the opened indoor unit are acquired, and the degree of subcooling is determined according to the average value of the operating parameters of the opened indoor units.
  • the air conditioning system operates in a state where the outdoor unit capacity is greater than the indoor unit capacity, and operates in the low temperature heating mode.
  • an embodiment of the present invention further provides an air conditioning system including an indoor unit and an outdoor unit, wherein an electronic expansion valve is disposed in a refrigerant pipeline between the indoor unit and the outdoor unit, and the air conditioning system is provided.
  • the controller further includes: determining whether the front end of the electronic expansion valve of the air conditioning system has no subcooling; and determining that the front end of the electronic expansion valve of the air conditioning system has no subcooling, reducing the opening of the electronic expansion valve until the The front end of the electronic expansion valve of the air conditioning system reappears to a degree of subcooling; after the front end of the electronic expansion valve of the air conditioning system reappears to a degree of subcooling, the opening of the electronic expansion valve is PI adjusted until the front end of the electronic expansion valve The coldness tends to be stable.
  • the controller is further configured to: adjust a current opening degree of the electronic expansion valve to a preset opening value; if the electronic expansion valve operates at the adjusted opening value, the front end of the electronic expansion valve does not appear too cold Degree, continue to reduce the opening of the electronic expansion valve.
  • the controller is further configured to: if the reduced degree of opening of the electronic expansion valve is a preset minimum opening of the electronic expansion valve and the front end of the electronic expansion valve still does not exhibit subcooling, then controlling the The opening of the electronic expansion valve is lowered to a new opening value, and the new opening value is lower than the preset opening value; by sequentially reducing the opening of the electronic expansion valve until the front end of the electronic expansion valve of the air conditioning system reappears Too cold.
  • the air outlet and the air inlet of the indoor heat exchanger are respectively provided with a temperature sensor for detecting the outlet temperature and the intake air temperature of the heat exchanger; the controller is further used for: calculating the indoor The difference between the intake air temperature and the outlet air temperature of the heat exchanger, when the difference between the intake air temperature and the outlet air temperature of the indoor heat exchanger is within a preset first difference range, it is determined whether the front end of the electronic expansion valve of the air conditioning system is absent Too cold.
  • the air outlet of the indoor heat exchanger is provided with a temperature sensor for detecting the outlet temperature of the heat exchanger; and the exhaust port of the compressor in the outdoor unit is provided with a temperature sensor for Detecting the exhaust temperature of the compressor; the controller is further configured to: calculate a difference between the exhaust temperature of the compressor and the outlet temperature of the indoor unit, when the difference between the exhaust temperature of the compressor and the outlet temperature of the indoor unit is preset When the second difference is within the range, it is judged whether the front end of the electronic expansion valve of the air conditioning system has no undercooling.
  • a side of the electronic expansion valve close to the indoor unit is provided with a subcooling detecting device for detecting the degree of subcooling of the front end of the electronic expansion valve; and the controller is further configured to: when the front end of the electronic expansion valve passes When the cooling degree is less than the preset value, it is judged whether the front end of the electronic expansion valve of the air conditioning system has no subcooling.
  • the controller is further configured to: acquire an operating parameter of the opened indoor unit, and perform subcooling according to an average value of operating parameters of each opened indoor unit.
  • the controller is further configured to: acquire an operating parameter of the opened indoor unit, and perform subcooling according to an average value of operating parameters of each opened indoor unit.
  • the controller is further configured to: determine whether the front end of the electronic expansion valve has no subcooling when the air conditioning system is operating in a state in which the outdoor unit capacity is greater than the indoor unit capacity, and when operating in the low temperature heating mode.
  • the embodiment of the present invention monitors whether the electronic expansion valve has no subcooling phenomenon, and if so, reduces the adjustment of the electronic expansion valve, so that the subcooling degree of the air conditioning system is extracted, thereby being in the air conditioning system.
  • the PI adjustment in the presence of subcooling can make the air conditioning system reach stability quickly and accurately.
  • FIG. 1 is a schematic structural view of an embodiment of an air conditioning system according to the present invention.
  • FIG. 2 is a schematic flow chart of an embodiment of a valve body control method of an air conditioning system according to the present invention.
  • the invention provides a valve body control scheme for an air conditioning system, which is applied to an air conditioning system with a small outdoor unit capacity and a small indoor unit capacity, in particular, when the air conditioning system is operated at a low temperature heating, if the system is not subcooled, Reduce the opening of the electronic expansion valve to remove the subcooling of the air conditioning system, so that the air conditioning system runs stably.
  • the above air conditioning system may include various types, and may include an on-hook, a cabinet, a ceiling machine, a window machine, a mobile air conditioner, and an embedded air conditioner according to the installation manner; the frequency conversion machine and the fixed frequency machine may be included according to the working principle; Household air conditioners and commercial air conditioners.
  • An air conditioning system having a large outdoor unit capacity and a small indoor unit capacity during operation is within the scope of application of the present invention. For example, in a multi-connected air conditioning system, one outdoor unit drives a plurality of indoor units, and when several indoor units are turned off, there is a case where the outdoor unit has a large indoor unit capacity.
  • the air conditioning system will be described below by taking a multi-line system as an example.
  • the air conditioning system may include an outdoor unit 110, a plurality of indoor units 120, and a refrigerant circulation circuit formed by the outdoor unit 110 and the indoor unit 120.
  • the refrigerant circulation lines of the plurality of indoor units 120 are cyclically arranged.
  • Each of the indoor units 120 may include an indoor heat exchanger 121 and an indoor fan 122.
  • the outdoor unit 110 may include a compressor 111, an outdoor heat exchanger 112, an outdoor fan 113, a four-way valve 114, and the like.
  • An electronic expansion valve 130 is further disposed in the refrigerant circuit of the outdoor unit 110 and the indoor unit 120 to throttle the flow rate of the refrigerant.
  • the air outlet of the compressor 111 is connected to the first interface of the four-way valve 114, the second port of the four-way valve 114 is connected to one end of the outdoor heat exchanger 112, and the other end of the outdoor heat exchanger 112 is respectively coupled to the electronic expansion valve 130.
  • One end of the indoor heat exchanger 121 of each indoor unit 120 is connected, and the other end of the indoor heat exchanger 121 is connected to the air return port of the compressor 111. It should be noted that some components of the air conditioning system are shown in FIG. 1, and it is not limited to set corresponding components in order to implement other functions.
  • the compressor 111 compresses the refrigerant to discharge the high-pressure steam refrigerant and flows through the outdoor heat exchanger, while the outdoor air sucked by the outdoor fan flows through the outdoor heat exchanger to the outdoor heat exchanger.
  • the high-pressure steam refrigerant performs heat exchange, so that the high-pressure steam refrigerant condenses into a high-pressure liquid; the high-pressure liquid enters the indoor heat exchanger through the throttle valve, and evaporates at a corresponding low pressure to absorb the surrounding heat, and the indoor fan continuously keeps the air
  • the indoor heat exchanger is taken in for heat exchange, and the air cooled after the heat exchange is sent into the room. In this way, indoor air continuously circulates to achieve the purpose of reducing indoor humidity.
  • the outdoor heat exchanger when the air conditioner is operating in the cooling mode, the outdoor heat exchanger may also be referred to as a condenser, and the indoor heat exchanger may also be referred to as an evaporator.
  • the refrigerant circulation loop When the air conditioner is running in the heating mode, the refrigerant circulation loop is opposite to the refrigerant circulation loop in the cooling mode, and the outdoor heat exchanger may be referred to as an evaporator, and the indoor heat exchanger may be referred to as a condenser.
  • connection between the indoor unit 120 and the outdoor unit 110 is respectively provided with an on-off valve to close the on-off valve corresponding to the indoor unit to be shut down when receiving the shutdown command of the indoor unit. Therefore, during the operation of the above air conditioning system, there will be a case where the indoor unit capacity is large and the indoor unit capacity is small.
  • the present invention proposes a valve body control scheme for controlling the opening degree of the electronic expansion valve 130 to prevent fluctuations of the air conditioning system. details as follows:
  • the air conditioning system further includes: a controller 140 connected to the electronic expansion valve 130, the controller 140 is configured to determine whether the front end of the electronic expansion valve 130 of the air conditioning system has no subcooling; when determining that the front end of the electronic expansion valve 130 of the air conditioning system is absent In the case of subcooling, the opening degree of the electronic expansion valve 130 is lowered until the front end of the electronic expansion valve 130 of the air conditioning system reappears. Further, after the degree of subcooling reappears at the front end of the electronic expansion valve 130 of the air conditioning system, the opening degree of the electronic expansion valve is PI-adjusted so that the degree of subcooling of the front end of the electronic expansion valve is stabilized.
  • the embodiment of the present invention reduces the degree of subcooling of the air conditioning system by reducing the opening degree of the electronic expansion valve 130, and performs PI adjustment in the case where the air conditioning system has a degree of subcooling, so that the air conditioner can be made.
  • the system is more stable.
  • the opening degree of the electronic expansion valve 130 can be directly adjusted to a preset opening value, and the preset opening value is Is a lower opening value, such as 36 steps. If the preset opening value still fails to cause the air conditioning system to re-appear the degree of subcooling, the opening of the electronic expansion valve can be continuously lowered. Such an arrangement can make it possible to quickly find the opening value of the degree of subcooling of the air conditioning system when the opening degree of the electronic expansion valve 130 of the pre-conditioning air conditioning system is large.
  • the refrigerant at the front end of the electronic expansion valve 130 is a liquid, and the flow rate of the refrigerant in the indoor unit can be adjusted by the opening degree of the electronic expansion valve 130, thereby making the air conditioning system more stable. Therefore, when the electronic expansion valve 130 reappears in the degree of subcooling, or when the electronic expansion valve 130 has a degree of subcooling, the opening degree of the electronic expansion valve can be PI adjusted to stabilize the air conditioning system.
  • the PI adjustment of the opening degree of the electronic expansion valve is mainly based on the current opening value, and it is determined whether the degree of subcooling of the front end of the electronic expansion valve reaches a steady state.
  • the feedback signal of the degree of subcooling of the electronic expansion valve 130 may be collected, and the feedback signal may be compared with the current degree of subcooling of the electronic expansion valve 130, and the opening degree adjustment may be performed according to the comparison result. For example, if the previous subcooling degree is greater than the latter subcooling degree, the opening degree of the electronic expansion valve 130 is increased; when the previous subcooling degree is smaller than the latter subcooling degree, the opening degree of the electronic expansion valve 130 is adjusted to be small. This adjustment is repeated until the degree of subcooling of the front end of the electronic expansion valve 130 tends to be smooth. That is, the floating range of the degree of subcooling of the front end of the electronic expansion valve 130 is within a normal range, for example, [-0.2, +0.2].
  • the embodiment of the present invention monitors whether the electronic expansion valve has no subcooling phenomenon, and if so, reduces the adjustment of the electronic expansion valve, so that the subcooling degree of the air conditioning system is extracted, thereby being in the air conditioning system.
  • the PI adjustment in the presence of subcooling can make the air conditioning system reach stability quickly and accurately.
  • the electronic expansion valve will preset an adjustment range, and the electronic expansion valve has an unadjustable area, that is, from zero to the minimum valve opening pulse given by the electronic expansion valve manufacturer.
  • embodiments of the present invention pre-set the electronic expansion to a minimum opening, such as 24 steps.
  • the opening degree of the electronic expansion valve 130 is lowered to extract the degree of subcooling of the air conditioning system, if the lowered degree of opening of the electronic expansion valve 130 is the preset minimum opening degree of the electronic expansion valve 130, and the electronic expansion valve 130, after the preset minimum opening degree is performed for the refrigerant adjustment, the front end of the electronic expansion valve 130 still cannot be subcooled, and the controller 140 reduces the opening degree of the electronic expansion valve 130 to a new opening value, and The new opening value is lower than the preset minimum opening value. Then, it is determined whether the front end of the electronic expansion valve 130 has a degree of subcooling. If not, the electronic expansion valve 130 is controlled to decrease to a new opening value, which is lower than the previous new opening value. .
  • the controller 140 can control the on/off of each indoor unit, self-learn and obtain the minimum opening degree of the electronic expansion valve.
  • the self-learning electronic expansion valve can ensure the performance of the air conditioning system is reliable and stable, and can obtain a smaller opening of the electronic expansion valve, thereby preventing fluctuations of the air conditioning system.
  • valve body control scheme is mainly applied to an air conditioning system that operates at a low temperature.
  • the refrigerant discharged from the outdoor unit must exceed the heating capacity required by the indoor unit, so that there will be gas at the front end of the electronic expansion valve. Liquid, gas will block the flow of refrigerant, so that the refrigerant gas of the indoor unit will fully radiate heat in the indoor unit; the liquid will accelerate the flow of the refrigerant, so that the condensed gas of the indoor unit will not flow out when it is fully radiated, thus causing system fluctuations. .
  • the controller 140 determines whether the front end of the electronic expansion valve has no subcooling degree, it is first determined whether the air conditioning system is operating in a state where the outdoor unit capacity is larger than the indoor unit capacity, and whether it is operating in the low temperature heating mode.
  • the valve body control scheme described above is performed to avoid waste of resources when the valve body control scheme is performed when not needed.
  • the air outlet and the air inlet of the indoor heat exchanger are both provided with a temperature sensor for detecting the outlet temperature and the intake air temperature of the heat exchanger; the controller 140 is further configured to: Calculating the difference between the intake air temperature and the outlet air temperature of the indoor heat exchanger, and determining the front end of the electronic expansion valve of the air conditioning system when the difference between the intake air temperature and the outlet air temperature of the indoor heat exchanger is within a preset first difference range Is there no coldness?
  • the first difference range is [0, a].
  • the value of a can take different values depending on the air conditioning system.
  • the difference between the intake air temperature and the outlet air temperature of the indoor heat exchanger is within a preset first difference range, it indicates that the refrigerant flow rate of the indoor unit is slow, and the heat exchange is sufficiently performed in the indoor unit, that is, the degree of subcooling is very low. Not even.
  • the air outlet of the indoor heat exchanger is provided with a temperature sensor for detecting the outlet temperature of the heat exchanger; and the exhaust port of the compressor in the outdoor unit is provided with a temperature sensor.
  • the controller 140 is further configured to: calculate a difference between the exhaust temperature of the compressor and the outlet temperature of the indoor unit, when the difference between the exhaust temperature of the compressor and the outlet temperature of the indoor unit is When the preset second difference range is within, it is judged whether the front end of the electronic expansion valve of the air conditioning system has no undercooling.
  • the second difference range is [0, b].
  • the b value can take different values depending on the air conditioning system.
  • the exhaust temperature of the compressor is substantially equal to the intake air temperature of the heat exchanger in the indoor unit, there is a difference in heat loss in the pipeline. Therefore, when the difference between the exhaust gas temperature and the outlet air temperature of the compressor is within a preset first difference range, it indicates that the refrigerant flow rate of the indoor unit is slow, and the heat exchange is sufficiently performed in the indoor unit, that is, the degree of subcooling is very low. Not even.
  • the indoor units that are turned on are monitored, as long as the operating parameters of one of the indoor units satisfy the non-subcooling degree determination. Conditions, the opening of the electronic expansion valve is adjusted.
  • the refrigerant of the outdoor unit is branched to each of the indoor units that are turned on, it is also possible to judge based on the average value of the parameters of the indoor units that are turned on, that is, the average value of the intake air temperature of each indoor unit, and the average value of the outlet air temperature. .
  • the side of the electronic expansion valve 130 adjacent to the indoor unit 120 is provided with a subcooling detecting device for detecting the degree of subcooling of the front end of the electronic expansion valve 130; the controller 140 is further configured to: When the front end subcooling degree of the electronic expansion valve 130 is less than a preset value, it is determined whether the front end of the electronic expansion valve of the air conditioning system has no subcooling.
  • the preset value can also take different values depending on the air conditioning system.
  • the present invention also provides a valve body control method for an air conditioning system, which controls the opening degree of the electronic expansion valve based on the air conditioning system.
  • the valve body control method of the air conditioning system includes the following steps:
  • the degree of subcooling can be directly detected according to the front end of the electronic expansion valve 130 to determine whether the front end of the electronic expansion valve has no subcooling.
  • it can also be judged by other parameters. For example, the exhaust temperature of the compressor, the intake air temperature and the outlet temperature of the indoor heat exchanger, and the like.
  • the embodiment of the present invention reduces the degree of subcooling of the electronic expansion valve of the air conditioning system by reducing the opening degree of the electronic expansion valve 130.
  • the opening degree of the electronic expansion valve 130 can be directly adjusted to a preset opening value, and the preset opening value is Is a lower opening value, such as 36 steps. If the preset opening value still fails to cause the air conditioning system to re-appear the degree of subcooling, the opening of the electronic expansion valve can be continuously lowered. Such an arrangement can make it possible to quickly find the opening value of the degree of subcooling of the air conditioning system when the opening degree of the electronic expansion valve 130 of the pre-conditioning air conditioning system is large.
  • the PI adjustment of the opening degree of the electronic expansion valve is mainly based on the current opening value, and it is determined whether the degree of subcooling of the front end of the electronic expansion valve reaches a steady state.
  • the feedback signal of the degree of subcooling of the electronic expansion valve 130 may be collected, and the feedback signal may be compared with the current degree of subcooling of the electronic expansion valve 130, and the opening degree adjustment may be performed according to the comparison result. For example, if the previous subcooling degree is greater than the latter subcooling degree, the opening degree of the electronic expansion valve 130 is increased; when the previous subcooling degree is smaller than the latter subcooling degree, the opening degree of the electronic expansion valve 130 is adjusted to be small.
  • the embodiment of the present invention monitors whether the electronic expansion valve has no subcooling phenomenon, and if so, reduces the adjustment of the electronic expansion valve, so that the subcooling degree of the air conditioning system is extracted, thereby being in the air conditioning system.
  • the PI adjustment in the presence of subcooling can make the air conditioning system reach stability quickly and accurately.
  • the step of reducing the opening degree of the electronic expansion valve in the above step S120 includes: if the lowered degree of opening of the electronic expansion valve 130 is a preset minimum opening degree of the electronic expansion valve and the electronic expansion valve 130 is opened at the preset minimum After the operation, if the front end of the electronic expansion valve 130 still does not have the degree of subcooling, the opening degree of the electronic expansion valve 130 is controlled to decrease to a new opening value, and the new opening value is lower than the preset opening value. And the process proceeds to step S110.
  • the electronic expansion valve is controlled to be lowered to a new opening value which is lower than the previous new opening value.
  • the degree of subcooling reappears until the front end of the electronic expansion valve 130 of the air conditioning system.
  • the electronic expansion valve will preset an adjustment range, and the electronic expansion valve has an unadjustable area, that is, from zero to the minimum valve opening pulse given by the electronic expansion valve manufacturer.
  • embodiments of the present invention pre-set the electronic expansion to a minimum opening, such as 24 steps.
  • the opening degree of the electronic expansion valve 130 is lowered to extract the degree of subcooling of the air conditioning system, if the opening degree of the electronic expansion valve 130 is lowered to a preset minimum opening degree, the front end of the electronic expansion valve is still unable to exhibit subcooling degree. Then, the controller 140 reduces the opening degree of the electronic expansion valve 130 to a new opening degree value, and the new opening degree value is lower than the preset minimum opening degree value.
  • the controller 140 can control the on/off of each indoor unit, self-learn and obtain the minimum opening degree of the electronic expansion valve.
  • the self-learning electronic expansion valve can ensure the performance of the air conditioning system is reliable and stable, and can obtain a smaller opening of the electronic expansion valve, thereby preventing fluctuations of the air conditioning system.
  • valve body control scheme is mainly applied to an air conditioning system that operates at a low temperature.
  • the refrigerant discharged from the outdoor unit must exceed the heating capacity required by the indoor unit, so that there will be gas at the front end of the electronic expansion valve. Liquid, gas will block the flow of refrigerant, so that the refrigerant gas of the indoor unit will fully radiate heat in the indoor unit; the liquid will accelerate the flow of the refrigerant, so that the condensed gas of the indoor unit will not flow out when it is fully radiated, thus causing system fluctuations. .
  • step S110 before determining whether the front end of the electronic expansion valve has no subcooling degree in the above step S110, it is first determined whether the air conditioning system is operating in a state where the outdoor unit capacity is larger than the indoor unit capacity, and whether it is operating in the low temperature heating mode.
  • the valve body control scheme described above is performed to avoid waste of resources when the valve body control scheme is performed when not needed.
  • the step S110 may include: acquiring an intake air temperature and an air outlet temperature of the indoor heat exchanger; and when the difference between the intake air temperature and the air outlet temperature of the indoor heat exchanger is within a preset first difference range; Determine whether the front end of the electronic expansion valve of the air conditioning system has no subcooling.
  • the first difference range is [0, a].
  • the value of a can take different values depending on the air conditioning system.
  • the difference between the intake air temperature and the outlet air temperature of the indoor heat exchanger is within a preset first difference range, it indicates that the refrigerant flow rate of the indoor unit is slow, and the heat exchange is sufficiently performed in the indoor unit, that is, the degree of subcooling is very low. Not even.
  • the step S110 may further include: acquiring an exhaust temperature of the compressor and an outlet temperature of the indoor heat exchanger; and a difference between the exhaust temperature of the compressor and the outlet temperature of the indoor unit is preset When the difference is within the range of two, it is judged whether the front end of the electronic expansion valve of the air conditioning system has no subcooling.
  • the second difference range is [0, b]. The b value can take different values depending on the air conditioning system. Since the exhaust temperature of the compressor is substantially equal to the intake air temperature of the indoor unit, there is a difference in heat loss in the pipeline.
  • the indoor units that are turned on are monitored, as long as the operating parameters of one of the indoor units satisfy the non-subcooling degree determination. Conditions, the opening of the electronic expansion valve is adjusted.
  • the refrigerant of the outdoor unit is branched to each of the indoor units that are turned on, it is also possible to judge based on the average value of the parameters of the indoor units that are turned on, that is, the average value of the intake air temperature of each indoor unit, and the average value of the outlet air temperature. .
  • the step S110 may further include: acquiring a front end subcooling degree of the electronic expansion valve; and determining whether the front end of the electronic expansion valve of the air conditioning system is not too cold when the front end of the electronic expansion valve is less than a preset value degree.
  • the preset value can also take different values depending on the air conditioning system.
  • the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better.
  • Implementation Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

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Abstract

一种空调系统及其阀体控制方法，包括：判断空调系统的电子膨胀阀（130）前端是否无过冷度；当判断无过冷度时，降低电子膨胀阀（130）的开度，直到电子膨胀阀（130）的前端重新出现过冷度；当重新出现过冷度后，对电子膨胀阀（130）的开度进行PI调节，直到电子膨胀阀（130）前端的过冷度稳定。该空调系统能快速、准确地达到稳定。

Description

空调系统及其阀体控制方法
技术领域
本发明涉及空调领域，尤其涉及空调系统及其阀体控制方法。
背景技术
空调由于具有湿度调节的功能，备受用户亲睐。但是空调运行室外机容量大室内机容量小的情况时，若电子膨胀阀的开度如果过大，电子膨胀阀前端的过冷度将出现一会大一会小的现象，因此电子膨胀阀前端一会儿有气体，一会儿有液体。当电子膨胀阀前端是气体时，会阻塞冷媒流动，室内机内的冷媒会流速减慢；当电子膨胀阀前端是液体时，室内机内的冷媒会加快流动。若电子膨胀阀的开度调节不匹配，则会出现空调系统的波动。
发明内容
本发明的主要目的在于提供一种调空调的阀体控制方法及空调系统，旨在防止空调系统的波动，使得空调系统的运行更加稳定。
为实现上述目的，本发明提供的一种空调系统的阀体控制方法，包括以下步骤：
S1、空调系统运行过程中，判断空调系统的电子膨胀阀前端是否无过冷度；
S2、当判断空调系统的电子膨胀阀前端无过冷度时，降低所述电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度；
S3、当空调系统的电子膨胀阀前端重新出现过冷度后，对所述电子膨胀阀的开度进行PI调节，直到所述电子膨胀阀前端的过冷度趋于稳定。
优选地，所述降低电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度的步骤包括：
将电子膨胀阀的当前开度调节至预设的开度值；
若电子膨胀阀以调节后的开度值运行后，电子膨胀阀前端仍未出现过冷度，则继续降低电子膨胀阀的开度。
优选地，所述降低电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度的步骤还包括：
若降低后的所述电子膨胀阀的开度为电子膨胀阀的预设最小开度且以所述预设最小开度运行后电子膨胀阀的前端仍然未出现过冷度，则控制所述电子膨胀阀的开度降低至新的开度值，且所述新的开度值比预设最小开度值低，并转入步骤S1。
优选地，所述判断空调系统的电子膨胀阀前端是否无过冷度的步骤包括：
获取室内换热器的进气温度和出气温度；
当室内换热器的进气温度和出气温度的差值在预设的第一差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
优选地，所述判断空调系统的电子膨胀阀前端是否无过冷度的步骤包括：
获取压缩机的排气温度和室内换热器的出气温度；
当压缩机的排气温度和室内机的出气温度的差值在预设的第二差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
优选地，所述判断空调系统的电子膨胀阀前端是否无过冷度的步骤包括：
获取电子膨胀阀的前端过冷度；
当电子膨胀阀的前端过冷度小于预设值时，判断空调系统的电子膨胀阀前端是否无过冷度。
优选地，若空调系统为多联机时，则对已开启的室内机的运行参数进行获取，并根据各开启的室内机的运行参数的平均值进行过冷度的判断。
优选地，所述判断电子膨胀阀前端是否无过冷度的步骤在执行时，所述空调系统运行在室外机容量大于室内机容量的状态，且运行在低温制热模式。
此外，为实现上述目的，本发明实施例还提供了一种空调系统，包括室内机和室外机，所述室内机和室外机之间的冷媒管路中设置有电子膨胀阀，所述空调系统还包括控制器，用于：判断空调系统的电子膨胀阀前端是否无过冷度；当判断空调系统的电子膨胀阀前端无过冷度时，降低所述电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度；当空调系统的电子膨胀阀前端重新出现过冷度后，对所述电子膨胀阀的开度进行PI调节，直到所述电子膨胀阀前端的过冷度趋于稳定。
优选，所述控制器还用于：将电子膨胀阀的当前开度调节至预设的开度值；若电子膨胀阀以调节后的开度值运行后，电子膨胀阀前端仍未出现过冷度，则继续降低电子膨胀阀的开度。
优选地，所述控制器还用于：若降低后的所述电子膨胀阀的开度为电子膨胀阀的预设最小开度且电子膨胀阀的前端仍然未出现过冷度，则控制所述电子膨胀阀的开度降低至新的开度值，且所述新的开度值比预设开度值低；通过依次降低电子膨胀阀的开度，直到空调系统的电子膨胀阀前端重新出现过冷度。
优选地，所述室内机内换热器的出气口和进气口均设有温度传感器，用于检测所述换热器的出气温度和进气温度；所述控制器还用于：计算室内换热器的进气温度和出气温度的差，当室内换热器的进气温度和出气温度的差值在预设的第一差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
优选地，所述室内机内换热器的出气口均设有温度传感器，用于检测所述换热器的出气温度；所述室外机内压缩机的排气口设有温度传感器，用于检测压缩机的排气温度；控制器还用于：计算压缩机的排气温度和室内机的出气温度的差，当压缩机的排气温度和室内机的出气温度的差值在预设的第二差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
优选地，所述电子膨胀阀的靠近室内机的一侧设有过冷度检测装置，用于检测电子膨胀阀的前端过冷度；所述控制器还用于：当电子膨胀阀的前端过冷度小于预设值时，判断空调系统的电子膨胀阀前端是否无过冷度。
优选地，若空调系统为多联机时，则所述控制器还用于：对已开启的室内机的运行参数进行获取，并根据各开启的室内机的运行参数的平均值进行过冷度的判断。
优选地，所述控制器还用于：在空调系统运行在室外机容量大于室内机容量的状态，且运行在低温制热模式时，进行电子膨胀阀前端是否无过冷度的判断。
本发明实施例在空调系统的运行过程中，通过监测电子膨胀阀是否存在无过冷度现象，若存在则降低电子膨胀阀的调节，以使得空调系统的过冷度憋出来，从而在空调系统存在过冷度的情况下进行PI调节，可以使得空调系统快速、准确地达到稳定。
附图说明
图1为本发明空调系统一实施例的结构示意图；
图2为本发明空调系统的阀体控制方法一实施例的流程示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提出一种空调系统的阀体控制方案，应用于室外机容量大室内机容量小的空调系统控制，尤其是该空调系统运行在低温制热时，若系统出现无过冷度，则可以降低调节电子膨胀阀的开度，以将空调系统的过冷度憋出来，从而使得空调系统稳定运行。
上述空调系统可包括多种类型，按安装方式可包括挂机、柜机、天花机、窗机、移动式空调、嵌入式空调；按工作原理可包括变频机和定频机；按使用环境可包括家用空调和商用空调。凡是运行过程中会出现室外机容量大室内机容量小的空调系统均在本发明的适用范围内。例如，多联机空调系统，一个室外机带动多个室内机，当其中几个室内机处于关闭时，就会出现室外机容量大室内机容量小的情况。以下将以多联机系统为例对空调系统进行描述。
如图1所示，该空调系统可包括一个室外机110、多个室内机120、以及室外机110与室内机120形成的冷媒循环回路。该多个室内机120的冷媒循环管路循环设置。其中，每个室内机120均可以包括室内换热器121、室内风机122；室外机110可包括压缩机111、室外换热器112、室外风机113、四通阀114等等。其中室外机110和室内机120的冷媒管路中还设有电子膨胀阀130，以对冷媒的流量起到节流作用。压缩机111的出气口与四通阀114的第一接口连接，四通阀114的第二接口与室外换热器112的一端连接，室外换热器112的另一端经电子膨胀阀130分别与每个室内机120的室内换热器121的一端连接，室内换热器121的另一端与压缩机111的回气口连接。需要说明的是，图1中示出了空调系统的部分组件，不限定其为了实现其他功能而设置对应的组件。
空调运行在制冷模式时，压缩机111将冷媒经过压缩后排出高压蒸汽冷媒，并流经室外换热器，同时室外风扇吸入的室外空气流经该室外换热器，对室外换热器内的高压蒸汽冷媒进行换热，使得该高压蒸汽冷媒凝结为高压液体；该高压液体经过节流阀后进入室内换热器，并在相应的低压下蒸发，吸收周围的热量，同时室内风机使空气不断吸入室内换热器进行热交换，并将热交换后变冷的空气送入室内。如此室内空气不断循环流动，达到降低室内湿度的目的。可以理解的是，当空调运行在制冷模式时，室外换热器还可称为冷凝器，室内换热器还可称为蒸发器。空调运行在制热模式时冷媒循环回路与制冷模式时的冷媒循环回路正好相反，而且室外换热器可称为蒸发器，室内换热器可称为冷凝器。
上述室内机120与室外机110的连接处分别设有开关阀，以在接收到室内机的关机指令时，关闭待关机的室内机对应的开关阀。因此，上述空调系统在运行过程中，将出现室内机容量大室内机容量小的情况。
针对上述空调系统出现室外机容量大室内机容量小的情况，本发明提出了一种阀体控制方案，通过对电子膨胀阀130的开度进行控制，以防止空调系统的波动。具体如下：
上述空调系统还包括：与上述电子膨胀阀130连接的控制器140，该控制器140用于判断空调系统的电子膨胀阀130前端是否无过冷度；当判断空调系统的电子膨胀阀130前端无过冷度时，降低所述电子膨胀阀130的开度，直到空调系统的电子膨胀阀130前端重新出现过冷度。而且，在空调系统的电子膨胀阀130前端重新出现过冷度后，对电子膨胀阀的开度进行PI调节，以使电子膨胀阀的前端过冷度达到稳定。
当电子膨胀阀130无过冷度时，表明室内机已经没有足够的换热能力，致使没有经过充分换热的冷媒流出室内机。此时为了防止空调系统的波动，本发明实施例通过降低电子膨胀阀130的开度，使空调系统的过冷度憋出来，在空调系统存在过冷度的情况下进行PI调节，可以使得空调系统更加稳定。
一实施例中，上述判断空调系统的电子膨胀阀130的前端无过冷度时，可以直接将电子膨胀阀130的开度调节至一个预设的开度值，且该预设的开度值为一个较低的开度值，例如36步。若该预设的开度值仍然无法使得空调系统重新出现过冷度，则可以继续降低该电子膨胀阀的开度。如此设置可以使得当调节前空调系统的电子膨胀阀130的开度较大时，可以快速找到将空调系统的过冷度憋出来的开度值。
由于电子膨胀阀130有过冷度时，电子膨胀阀130前端的冷媒为液体，通过对电子膨胀阀130的开度可以调节室内机中冷媒的流速，从而使得空调系统更加稳定。因此，当电子膨胀阀130重新出现过冷度时，或者当电子膨胀阀130有过冷度时，可以对电子膨胀阀的开度进行PI调节，以使空调系统达到稳定。上述对电子膨胀阀的开度进行PI调节，主要是基于当前开度值的基础上进行上下调节，并判断电子膨胀阀前端过冷度是否达到稳定状态。一实施例中，可以通过采集电子膨胀阀130的过冷度的反馈信号，并将该反馈信号与电子膨胀阀130的当前过冷度进行比较，并根据比较结果进行开度调节。例如，前一次过冷度比后一次过冷度大，则电子膨胀阀130的开度调大；前一次过冷度比后一次过冷度小，则电子膨胀阀130的开度调小，如此反复调整，直到电子膨胀阀130的前端过冷度趋于平稳。即电子膨胀阀130的前端过冷度的浮动范围在正常范围内，例如[-0.2，+0.2]。
本发明实施例在空调系统的运行过程中，通过监测电子膨胀阀是否存在无过冷度现象，若存在则降低电子膨胀阀的调节，以使得空调系统的过冷度憋出来，从而在空调系统存在过冷度的情况下进行PI调节，可以使得空调系统快速、准确地达到稳定。
由于电子膨胀阀的控制特性，电子膨胀阀均会预设一个调节范围，而且电子膨胀阀存在一个不可调区域，即从零到电子膨胀阀厂商给出的最小开阀脉冲。因此，本发明实施例将电子膨胀预设一个最小开度，例如24步。在对电子膨胀阀130的开度进行降低以将空调系统的过冷度憋出来时，若降低后的电子膨胀阀130的开度为电子膨胀阀130的预设最小开度，且电子膨胀阀130处于该预设最小开度进行冷媒调节后，电子膨胀阀130的前端仍然无法出现过冷度，则控制器140将控制所述电子膨胀阀130的开度降低至新的开度值，且所述新的开度值比预设最小开度值低。然后继续判断电子膨胀阀130的前端是否出现过冷度，若未出现，则控制电子膨胀阀130的降低至新的开度值，该新的开度值比前一次的新的开度值低。如此，通过依次降低电子膨胀阀的开度，直到空调系统的电子膨胀阀130前端重新出现过冷度。一实施例中，若空调系统为多联机系统，则该控制器140可以控制各室内机的开/关，自学习并获得该电子膨胀阀的最小开度。该自学习的电子膨胀阀的开度既可以保证空调系统的性能可靠、稳定，又可以获得电子膨胀阀的更小的开度，从而防止空调系统的波动。
需要说明的是，上述电子膨胀阀的开度的调节后，都需要等一段时间再去判断是否还需要再调节，以给电子膨胀阀的开度调节之后对空调系统的作用时间。
另外，上述阀体控制方案主要应用于运行低温制热的空调系统。以多联机为例，由于室外温度低，当室内机只开启一台时，室外机排出的冷媒必然超过了室内机需要的制热排气量，致使电子膨胀阀前端一会有气体一会有液体，气体会阻塞制冷剂流动，从而室内机的冷媒气体将在室内机中充分放热；液体会加快制冷剂流动，从而室内机的冷凝气体未得到充分放热就流出，如此将造成系统波动。因此，上述控制器140判断电子膨胀阀前端是否无过冷度时，先判断空调系统中是否运行在室外机容量大于室内机容量的状态，且是否运行在低温制热模式。在室外机容量大于室内机容量的状态，且运行低温制热模式下，进行上述阀体控制方案，避免在不需要的时候进行上述阀体控制方案而浪费资源。
以下实施例具体描述电子膨胀阀无过冷度的具体判断方式：
一实施例中，上述室内机内换热器的出气口和进气口均设有温度传感器，用于检测所述换热器的出气温度和进气温度；所述控制器140还用于：计算室内换热器的进气温度和出气温度的差，当室内换热器的进气温度和出气温度的差值在预设的第一差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。本实施例中，该第一差值范围为[0，a]。该a值可以根据空调系统的不同而取不同值。当室内换热器的进气温度和出气温度的差在预设的第一差值范围内时，表明室内机的冷媒流速慢，并在室内机中充分换热，即过冷度非常低，甚至没有。
另一实施例中，上述室内机内换热器的出气口均设有温度传感器，用于检测所述换热器的出气温度；所述室外机内压缩机的排气口设有温度传感器，用于检测压缩机的排气温度；控制器140还用于：计算压缩机的排气温度和室内机的出气温度的差，当压缩机的排气温度和室内机的出气温度的差值在预设的第二差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。本实施例中，该第二差值范围为[0，b]。该b值可以根据空调系统的不同而取不同值。由于压缩机的排气温度与室内机内换热器的进气温度基本相等，除了管路中的热量流失会存在差异。因此，当压缩机的排气温度和出气温度的差在预设的第一差值范围内时，表明室内机的冷媒流速慢，并在室内机中充分换热，即过冷度非常低，甚至没有。
需要说明的是，上述电子膨胀阀130的无过冷度判定中，若空调系统为多联机时，则对开启的室内机均进行监控，只要其中一个室内机的运行参数满足无过冷度判定条件，则对电子膨胀阀的开度进行调节。当然，由于室外机的冷媒将分流至各开启的室内机，因此也可以根据各开启的室内机的参数的平均值进行判断，即各室内机的进气温度的平均值、出气温度的平均值。
又一实施例中，上述电子膨胀阀130的靠近室内机120的一侧设有过冷度检测装置，用于检测电子膨胀阀130的前端过冷度；所述控制器140还用于：当电子膨胀阀130的前端过冷度小于预设值时，判断空调系统的电子膨胀阀前端是否无过冷度。该预设值也可以根据空调系统的不同而取不同值。
对应地，本发明还提出一种空调系统的阀体控制方法，基于上述空调系统对电子膨胀阀的开度进行控制。如图2所示，该空调系统的阀体控制方法包括以下步骤：
S110、判断空调系统的电子膨胀阀前端是否无过冷度；
本实施例中，可根据电子膨胀阀130的前端直接对过冷度进行检测，以判断电子膨胀阀前端是否无过冷度。当然也可以通过其他参数进行判断。例如压缩机的排气温度、室内换热器的进气温度和出气温度等等。
S120、当判断空调系统的电子膨胀阀前端无过冷度时，降低所述电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度。
当电子膨胀阀130无过冷度时，表明室内机已经没有足够的换热能力，致使没有经过充分换热的冷媒流出室内机。此时为了防止空调系统的波动，本发明实施例通过降低电子膨胀阀130的开度，以使空调系统的电子膨胀阀重新出现过冷度。
一实施例中，上述判断空调系统的电子膨胀阀130的前端无过冷度时，可以直接将电子膨胀阀130的开度调节至一个预设的开度值，且该预设的开度值为一个较低的开度值，例如36步。若该预设的开度值仍然无法使得空调系统重新出现过冷度，则可以继续降低该电子膨胀阀的开度。如此设置可以使得当调节前空调系统的电子膨胀阀130的开度较大时，可以快速找到将空调系统的过冷度憋出来的开度值。
S130、当空调系统的电子膨胀阀前端重新出现过冷度后，对所述电子膨胀阀的开度进行PI调节，直到所述电子膨胀阀前端的过冷度趋于稳定。
上述对电子膨胀阀的开度进行PI调节，主要是基于当前开度值的基础上进行上下调节，并判断电子膨胀阀前端过冷度是否达到稳定状态。一实施例中，可以通过采集电子膨胀阀130的过冷度的反馈信号，并将该反馈信号与电子膨胀阀130的当前过冷度进行比较，并根据比较结果进行开度调节。例如，前一次过冷度比后一次过冷度大，则电子膨胀阀130的开度调大；前一次过冷度比后一次过冷度小，则电子膨胀阀130的开度调小，如此反复调整，直到电子膨胀阀130的前端过冷度趋于平稳。即电子膨胀阀130的前端过冷度的浮动范围在正常范围内，例如[-0.2，+0.2]。
本发明实施例在空调系统的运行过程中，通过监测电子膨胀阀是否存在无过冷度现象，若存在则降低电子膨胀阀的调节，以使得空调系统的过冷度憋出来，从而在空调系统存在过冷度的情况下进行PI调节，可以使得空调系统快速、准确地达到稳定。
进一步地，上述步骤S120中降低电子膨胀阀的开度的步骤包括：若降低后的电子膨胀阀130的开度为电子膨胀阀的预设最小开度且电子膨胀阀130以该预设最小开度运行后，电子膨胀阀130的前端仍然未出现过冷度，则控制电子膨胀阀130的开度降低至新的开度值，且所述新的开度值比预设开度值低，并转入步骤S110。即，继续判断电子膨胀阀的前端是否出现过冷度，若未出现，则控制电子膨胀阀的降低至新的开度值，该新的开度值比前一次的新的开度值低。如此，通过依次降低电子膨胀阀的开度，直到空调系统的电子膨胀阀130前端重新出现过冷度。
由于电子膨胀阀的控制特性，电子膨胀阀均会预设一个调节范围，而且电子膨胀阀存在一个不可调区域，即从零到电子膨胀阀厂商给出的最小开阀脉冲。因此，本发明实施例将电子膨胀预设一个最小开度，例如24步。在对电子膨胀阀130的开度进行降低以将空调系统的过冷度憋出来时，若电子膨胀阀130的开度降低至预设最小开度，电子膨胀阀的前端仍然无法出现过冷度，则控制器140将控制所述电子膨胀阀130的开度降低至新的开度值，且所述新的开度值比预设最小开度值低。通过依次降低电子膨胀阀的开度，直到空调系统的电子膨胀阀130前端的过冷度稳定。一实施例中，若空调系统为多联机系统，则该控制器140可以控制各室内机的开/关，自学习并获得该电子膨胀阀的最小开度。该自学习的电子膨胀阀的开度既可以保证空调系统的性能可靠、稳定，又可以获得电子膨胀阀的更小的开度，从而防止空调系统的波动。
需要说明的是，上述电子膨胀阀的开度的调节后，都需要等一段时间再去判断是否还需要再调节，以给电子膨胀阀的开度调节之后对空调系统的作用时间。
另外，上述阀体控制方案主要应用于运行低温制热的空调系统。以多联机为例，由于室外温度低，当室内机只开启一台时，室外机排出的冷媒必然超过了室内机需要的制热排气量，致使电子膨胀阀前端一会有气体一会有液体，气体会阻塞制冷剂流动，从而室内机的冷媒气体将在室内机中充分放热；液体会加快制冷剂流动，从而室内机的冷凝气体未得到充分放热就流出，如此将造成系统波动。因此，上述步骤S110的判断电子膨胀阀前端是否无过冷度之前，先判断空调系统中是否运行在室外机容量大于室内机容量的状态，且是否运行在低温制热模式。在室外机容量大于室内机容量的状态，且运行低温制热模式下，进行上述阀体控制方案，避免在不需要的时候进行上述阀体控制方案而浪费资源。
以下实施例具体描述电子膨胀阀无过冷度的具体判断方式：
一实施例中，上述步骤S110可包括：获取室内换热器的进气温度和出气温度；当室内换热器的进气温度和出气温度的差值在预设的第一差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
本实施例中，该第一差值范围为[0，a]。该a值可以根据空调系统的不同而取不同值。当室内换热器的进气温度和出气温度的差在预设的第一差值范围内时，表明室内机的冷媒流速慢，并在室内机中充分换热，即过冷度非常低，甚至没有。
另一实施例中，上述步骤S110还可包括：获取压缩机的排气温度和室内换热器的出气温度；当压缩机的排气温度和室内机的出气温度的差值在预设的第二差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。本实施例中，该第二差值范围为[0，b]。该b值可以根据空调系统的不同而取不同值。由于压缩机的排气温度与室内机的进气温度基本相等，除了管路中的热量流失会存在差异。因此，当压缩机的排气温度和出气温度的差在预设的第一差值范围内时，表明室内机的冷媒流速慢，并在室内机中充分换热，即过冷度非常低，甚至没有。
需要说明的是，上述电子膨胀阀130的无过冷度判定中，若空调系统为多联机时，则对开启的室内机均进行监控，只要其中一个室内机的运行参数满足无过冷度判定条件，则对电子膨胀阀的开度进行调节。当然，由于室外机的冷媒将分流至各开启的室内机，因此也可以根据各开启的室内机的参数的平均值进行判断，即各室内机的进气温度的平均值、出气温度的平均值。
又一实施例中，上述步骤S110还可包括：获取电子膨胀阀的前端过冷度；当电子膨胀阀的前端过冷度小于预设值时，判断空调系统的电子膨胀阀前端是否无过冷度。该预设值也可以根据空调系统的不同而取不同值。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质（如ROM/RAM、磁碟、光盘）中，包括若干指令用以使得一台终端设备（可以是手机，计算机，服务器，空调器，或者网络设备等）执行本发明各个实施例所述的方法。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (16)

  1. 一种空调系统的阀体控制方法，其特征在于，所述空调系统的阀体控制方法包括以下步骤：
    S1、空调系统运行过程中，判断空调系统的电子膨胀阀前端是否无过冷度；
    S2、当判断空调系统的电子膨胀阀前端无过冷度时，降低所述电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度；
    S3、当空调系统的电子膨胀阀前端重新出现过冷度后，对所述电子膨胀阀的开度进行PI调节，直到所述电子膨胀阀前端的过冷度趋于稳定。
  2. 如权利要求1所述的阀体控制方法，其特征在于，所述降低电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度的步骤包括：
    将电子膨胀阀的当前开度调节至预设的开度值；
    若电子膨胀阀以调节后的开度值运行后，电子膨胀阀前端仍未出现过冷度，则继续降低电子膨胀阀的开度。
  3. 如权利要求2所述的阀体控制方法，其特征在于，所述降低电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度的步骤还包括：
    若降低后的所述电子膨胀阀的开度为电子膨胀阀的预设最小开度且以所述预设最小开度运行后电子膨胀阀的前端仍然未出现过冷度，则控制所述电子膨胀阀的开度降低至新的开度值，且所述新的开度值比预设最小开度值低，并转入步骤S1。
  4. 如权利要求1所述的阀体控制方法，其特征在于，所述判断空调系统的电子膨胀阀前端是否无过冷度的步骤包括：
    获取室内换热器的进气温度和出气温度；
    当室内换热器的进气温度和出气温度的差值在预设的第一差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
  5. 如权利要求1所述的阀体控制方法，其特征在于，所述判断空调系统的电子膨胀阀前端是否无过冷度的步骤包括：
    获取压缩机的排气温度和室内换热器的出气温度；
    当压缩机的排气温度和室内机的出气温度的差值在预设的第二差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
  6. 如权利要求1所述的阀体控制方法，其特征在于，所述判断空调系统的电子膨胀阀前端是否无过冷度的步骤包括：
    获取电子膨胀阀的前端过冷度；
    当电子膨胀阀的前端过冷度小于预设值时，判断空调系统的电子膨胀阀前端是否无过冷度。
  7. 如权利要求4或5所述的阀体控制方法，其特征在于，若空调系统为多联机时，则对已开启的室内机的运行参数进行获取，并根据各开启的室内机的运行参数的平均值进行过冷度的判断。
  8. 如权利要求1所述的阀体控制方法，其特征在于，所述判断电子膨胀阀前端是否无过冷度的步骤在执行时，所述空调系统运行在室外机容量大于室内机容量的状态，且运行在低温制热模式。
  9. 一种空调系统，包括室内机和室外机，所述室内机和室外机之间的冷媒管路中设置有电子膨胀阀，其特征在于，所述空调系统还包括控制器，用于：判断空调系统的电子膨胀阀前端是否无过冷度；当判断空调系统的电子膨胀阀前端无过冷度时，降低所述电子膨胀阀的开度，直到所述空调系统的电子膨胀阀前端重新出现过冷度；当空调系统的电子膨胀阀前端重新出现过冷度后，对所述电子膨胀阀的开度进行PI调节，直到所述电子膨胀阀前端的过冷度趋于稳定。
  10. 如权利要求9所述的空调系统，其特征在于，所述控制器还用于：将电子膨胀阀的当前开度调节至预设的开度值；若电子膨胀阀以调节后的开度值运行后，电子膨胀阀前端仍未出现过冷度，则继续降低电子膨胀阀的开度。
  11. 如权利要求10所述的空调系统，其特征在于，所述控制器还用于：若降低后的所述电子膨胀阀的开度为电子膨胀阀的预设最小开度且电子膨胀阀的前端仍然未出现过冷度，则控制所述电子膨胀阀的开度降低至新的开度值，且所述新的开度值比预设开度值低；通过依次降低电子膨胀阀的开度，直到空调系统的电子膨胀阀前端重新出现过冷度。
  12. 如权利要求9所述的空调系统，其特征在于，所述室内机内换热器的出气口和进气口均设有温度传感器，用于检测所述换热器的出气温度和进气温度；所述控制器还用于：计算室内换热器的进气温度和出气温度的差，当室内换热器的进气温度和出气温度的差值在预设的第一差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
  13. 如权利要求9所述的空调系统，其特征在于，所述室内机内换热器的出气口均设有温度传感器，用于检测所述换热器的出气温度；所述室外机内压缩机的排气口设有温度传感器，用于检测压缩机的排气温度；控制器还用于：计算压缩机的排气温度和室内机的出气温度的差，当压缩机的排气温度和室内机的出气温度的差值在预设的第二差值范围内时，判断空调系统的电子膨胀阀前端是否无过冷度。
  14. 如权利要求9所述的空调系统，其特征在于，所述电子膨胀阀的靠近室内机的一侧设有过冷度检测装置，用于检测电子膨胀阀的前端过冷度；所述控制器还用于：当电子膨胀阀的前端过冷度小于预设值时，判断空调系统的电子膨胀阀前端是否无过冷度。
  15. 如权利要求12或13所述的空调系统，其特征在于，若空调系统为多联机时，则所述控制器还用于：对已开启的室内机的运行参数进行获取，并根据各开启的室内机的运行参数的平均值进行过冷度的判断。
  16. 如权利要求9所述的空调系统，其特征在于，所述控制器还用于：在空调系统运行在室外机容量大于室内机容量的状态，且运行在低温制热模式时，进行电子膨胀阀前端是否无过冷度的判断。
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