WO2018094844A1 - 一种空调系统及控制方法 - Google Patents

一种空调系统及控制方法 Download PDF

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Publication number
WO2018094844A1
WO2018094844A1 PCT/CN2016/113673 CN2016113673W WO2018094844A1 WO 2018094844 A1 WO2018094844 A1 WO 2018094844A1 CN 2016113673 W CN2016113673 W CN 2016113673W WO 2018094844 A1 WO2018094844 A1 WO 2018094844A1
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Prior art keywords
air conditioning
conditioning system
pressure
heat exchanger
electronic expansion
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English (en)
French (fr)
Inventor
杨晓东
韦汉儒
李杏党
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Midea Group Co Ltd
Guangzhou Hualing Refrigeration Equipment Co Ltd
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Midea Group Co Ltd
Guangzhou Hualing Refrigeration Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention relates to the technical field of air conditioners, in particular to an air conditioning system for high temperature refrigeration and a control method thereof.
  • the air conditioning system usually adopts unloading to reduce the system load during high temperature cooling, and the refrigerant required for cooling of the air conditioning system gradually decreases as the outdoor side temperature increases, and the existing air conditioning system refrigerant cannot follow The change in the outdoor temperature changes, resulting in excessive system load due to excessive refrigerant at high outdoor temperatures, which affects the reliability of the unit.
  • the technical problem to be solved by the present invention is that the refrigerant of the air conditioning system cannot change with the change of the outdoor temperature when the air conditioner is cooled at a high temperature.
  • the present invention provides an air conditioning system including a main pipe including a compressor connected to a refrigeration circuit or a heating circuit, an outdoor heat exchanger, a first throttle assembly, and a room heat exchange
  • the air conditioning system further includes an auxiliary pipeline serially connected in series by an electronic expansion valve, a liquid storage tank, a check valve and a second throttle component, wherein the auxiliary pipeline is connected in parallel to the outdoor heat exchanger of the main pipeline a line between the outlet and the inlet of the indoor heat exchanger.
  • the compressor is connected to the outdoor heat exchanger and the indoor heat exchanger through a four-way valve Pick up.
  • a pressure sensor is arranged in the main line of the air conditioning system for monitoring the pressure of the air conditioning system.
  • the air conditioning system is provided with a controller, and the controller is respectively connected with the pressure sensor and the electronic expansion valve for controlling the opening degree of the electronic expansion valve according to the signal of the pressure sensor.
  • the outlet pipe of the liquid storage tank is disposed at the bottom of the liquid storage tank.
  • the compressor suction port is provided with a returning member for preventing backflow of gas sucked into the compressor.
  • the invention also provides a control method for the above air conditioning system, comprising the following steps:
  • the air conditioning system pressure P d is monitored, and it is determined whether the air conditioning system pressure P d is greater than the system first preset pressure P ds1 ,
  • the controller controls the electronic expansion valve to be closed, the air conditioning system operates according to the current state and continuously monitors the system pressure;
  • the controller controls the electronic expansion valve to open at a preset opening degree, the refrigerant enters the liquid storage tank, and then outputs through the liquid storage tank output tube, and flows through the one-way The valve and the second throttling assembly enter the indoor heat exchanger and continuously monitor system pressure.
  • the controller controls the electronic expansion valve to maintain the current opening degree, the air conditioning system operates according to the current state and continuously monitors the system pressure;
  • the controller controls the electronic expansion valve to increase the opening degree at a preset speed and continuously monitors the system pressure.
  • the liquid storage tank can adjust the stored or output refrigerant amount according to the change of the air conditioning system pressure.
  • the air conditioning system and the control method thereof provided by the invention have the beneficial effects that when the air conditioning system performs high temperature cooling, the air conditioning system can be controlled to store the refrigerant at a high temperature, and the system refrigerant flow rate and pressure are performed according to the opening degree of the electronic expansion valve. Continuous control, realized empty The system adjusts the refrigerant at high temperature, and the refrigerant re-enters the system cycle at low temperature. The system runs stably, reduces the system operation load, is environmentally friendly, and improves the user experience.
  • FIG. 1 is a schematic structural view of an air conditioning system of the present invention
  • FIG. 2 is a flow chart of a method for controlling an air conditioning system of the present invention
  • the air conditioning system of the present invention comprises a compressor connected to a circuit, a four-way valve 2, an outdoor heat exchanger 4, a first throttle assembly 5 and an indoor heat exchanger 10, said air conditioning system
  • the utility model further includes an auxiliary pipeline serially connected in series by the electronic expansion valve 6, the liquid storage tank 7, the check valve 8 and the second throttle assembly 9, and the auxiliary pipeline is connected in parallel to the outlet of the outdoor heat exchanger 4 in the main pipeline.
  • the controller is respectively connected to the temperature sensor 41 and the electronic expansion valve 8 for controlling the opening degree of the electronic expansion valve 6 according to the signal of the temperature sensor, and the outlet pipe of the liquid storage tank 7 is disposed in the liquid storage tank The bottom of 7.
  • the control method of the air conditioning system of the present invention is as shown in FIG. 2, and includes the following steps:
  • the air conditioning system pressure P d is monitored, and it is determined whether the air conditioning system pressure P d is greater than the system first preset pressure P ds1 ,
  • the controller controls the electronic expansion valve 6 to be closed, the air conditioning system operates according to the current state and continuously monitors the system pressure;
  • the controller controls the electronic expansion valve 6 to open at a preset opening degree, the refrigerant enters the liquid storage tank, and then flows through the output tube of the liquid storage tank 7 and flows through The check valve 8 and the second throttle assembly 0 enter the indoor heat exchanger and continuously monitor the system pressure.
  • the controller controls the electronic expansion valve 6 to maintain the current opening degree, the air conditioning system operates according to the current state and continuously monitors the system pressure;
  • the controller controls the electronic expansion valve 6 to increase the opening degree at a preset speed and continuously monitors the system pressure.
  • the controller controls the opening of the electronic expansion valve 6 to control the entry of the refrigerant in the liquid storage tank according to the system pressure P d being compared with the system first preset pressure P ds1 and the second preset pressure P ds2 , respectively. Output.
  • the liquid storage tank can adjust the stored or output refrigerant amount according to the change of the air conditioning system pressure.
  • the refrigerant circulation process is: the refrigerant is compressed by the compressor 1, flows through the four-way valve 2, enters the outdoor heat exchanger 4 for heat exchange, and is converted into a medium temperature high pressure.
  • the refrigerant then enters the indoor heat exchanger 10 through the first throttling assembly 5 for heat exchange, and the heat exchanged refrigerant re-injects into the compressor to compress.
  • the controller controls the electronic expansion valve 6 to open at a preset opening degree, and the refrigerant flows through the electronic expansion valve 6 into the liquid storage tank 7 (where the liquid storage tank inlet pipe can not be deeply stored in the liquid storage tank)
  • the liquid storage tank outlet pipe needs to be connected to the bottom of the liquid storage tank body so that the refrigerant can be output in time), and then the refrigerant enters the indoor heat exchanger after being throttled by the single valve 8 and the second throttle assembly 9 10 heat exchange, re-flow into the compressor after heat exchange 1 compression.
  • the controller controls the electronic expansion valve 6 to increase the opening degree at a preset speed to allow more refrigerant to enter the liquid storage In tank 7.
  • the controller controls the electronic expansion valve 6 to be closed, and the refrigerant stored in the liquid storage tank is returned to the system through the second throttle assembly for cooling, and continues to monitor the air conditioning system. Pressure, such loop control.
  • the predetermined time may be a factory setting of the air conditioning system, or may be customized by the user. Accordingly, when the air conditioning system is running a cooling mode, the air conditioning system is turned on monitoring pressure P d after a predetermined time, and judges as compared to the first preset pressure and a second predetermined system pressure, the controller controls the electronic expansion valve 6 The opening is used to control the entry and output of refrigerant in the reservoir.
  • the predetermined time may range from 0 s to 60 s.
  • the predetermined time may be 40 s. By setting a predetermined time of 40 s, the rate of change when the room temperature starts to change may be avoided.
  • the air conditioner adjusts the indoor temperature relatively gently, thereby improving the user's comfort to a certain extent.
  • the air conditioning system and the control method thereof provided by the invention can control the air conditioning system to store the refrigerant at a high temperature when performing high temperature cooling, and continuously control the flow rate and pressure of the system refrigerant according to the opening degree of the electronic expansion valve, thereby realizing the air conditioner.
  • the system stores the refrigerant at high temperature, and the refrigerant re-enters the system cycle at low temperature, the system runs stably, reduces the system operation load, is environmentally friendly, and improves the user experience.
  • the air conditioning system and the control method according to the present invention can control the air conditioning system to store the refrigerant at a high temperature when the air conditioning system performs high temperature cooling, and continuously control the system refrigerant flow rate and pressure according to the opening degree of the electronic expansion valve.
  • the air conditioning system stores the refrigerant at high temperatures, and the refrigerant re-enters the system at low temperatures.
  • the air conditioning system and the control method provided by the present invention increase an electronic expansion valve, a liquid storage tank, a check valve and a second throttle
  • the auxiliary pipelines in series are connected in series, and then the refrigerant flow rate and pressure of the air conditioning system are continuously controlled to achieve the storage of the refrigerant in the air conditioning system at a high temperature, and the refrigerant re-enters the system circulation at a low temperature, the system runs stably, and the system operation load is reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

一种空调系统，包括主管路，主管路包括连接成回路的压缩机（1）、四通阀（2）、室外换热器（4）、第一节流组件（5）和室内换热器（10）；空调系统还包括由电子膨胀阀（6）、储液罐（7）、单向阀（8）及第二节流组件（9）依次串联的辅管路，辅管路并联于主管路中室外换热器（4）的出口与室内换热器（10）入口之间的管路；空调系统的主管路中设有压力传感器（3），用来监测空调系统压力。还提供了一种空调系统的控制方法。实现了在高温时储存制冷剂，低温时制冷剂重新进入系统循环，系统运行稳定，降低系统运行负荷。

Description

一种空调系统及控制方法
交叉引用
本申请要求2016年11月25日提交的专利名称为“一种空调系统及控制方法”的第2016110756480号中国专利申请的优先权，其所公开的内容作为参考全文并入本申请。
技术领域
本发明涉及空调技术领域，特别涉及一种高温制冷的空调系统及其控制方法。
背景技术
目前的空调系统在高温制冷时通常采取卸荷的方式降低系统负荷，而空调系统制冷时所需的制冷剂随着室外侧温度的升高而逐渐减少，而现有的空调系统制冷剂无法随着室外温度的变化而变化，从而造成在室外高温时由于制冷剂偏多而造成系统负荷过大，影响了机组的可靠性。
发明内容
(一)要解决的技术问题
本发明目要解决的技术问题是在空调高温制冷时，空调系统制冷剂无法随着室外温度的变化而变化。
(二)技术方案
为了解决上述技术问题，本发明提供了一种空调系统，包括主管路，所述主管路包括连接成制冷回路或制热回路的压缩机、室外换热器、第一节流组件和室内换热器；所述空调系统还包括由电子膨胀阀、储液罐、单向阀及第二节流组件依次串联的辅管路，所述辅管路并联于所述主管路中室外换热器的出口与所述室内换热器入口之间的管路。
其中，所述压缩机通过四通阀与室外热交换器和室内热交换器连 接。
其中，所述空调系统的主管路中设有压力传感器，用来监测空调系统压力。
其中，所述空调系统设有控制器，所述控制器分别与压力传感器和电子膨胀阀连接，用于根据压力传感器的信号控制电子膨胀阀的开度。
其中，所述储液罐的出口管管口设置于储液罐的底部。
其中，所述压缩机吸气口设置有回气部件，用于防止吸入压缩机的气体回流。
本发明还提供了一种上述空调系统的控制方法，包括以下步骤：
当空调器运行制冷模式时，监测空调系统压力Pd，并判断空调系统压力Pd是否大于系统第一预设压力Pds1，
当空调系统压力Pd≤系统第一预设压力Pds1时，控制器控制电子膨胀阀关闭，空调系统按当前状态运行并持续监测系统压力；
当空调系统压力Pd>系统第一预设压力Pds1时，控制器控制电子膨胀阀以预设开度打开，制冷剂进入储液罐，然后经储液罐输出管输出，流经单向阀和第二节流组件后进入室内换热器，并持续监测系统压力。
当系统第二预设压力Pds2≥空调系统压力Pd>系统第一预设压力Pds1时，控制器控制电子膨胀阀保持当前开度，空调系统按当前状态运行并持续监测系统压力；
当空调系统压力Pd>系统第二预设压力Pds2时，控制器控制电子膨胀阀以预设速度增大开度，并持续监测系统压力。
其中，所述储液罐能够根据空调系统压力的变化调整储存或输出的制冷剂量。
(三)有益效果
本发明所提供的空调系统及其控制方法的有益效果是，在空调系统进行高温制冷时，能够控制空调系统在高温时储存制冷剂，并根据电子膨胀阀的开度进行系统制冷剂流量和压力的连续控制，实现了空 调系统在高温时储存制冷剂，低温时制冷剂重新进入系统循环，系统运行稳定，降低系统运行负荷，利于环保，且提高了用户体验。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明空调系统的结构示意图
图2是本发明空调系统控制方法的流程图
附图标记：1.压缩机，2.四通阀，3.压力传感器，4.室外换热器，5.第一节流组件，6.电子膨胀阀，7.储液罐，8.单向阀，9.第二节流组件，10.室内换热器，11.回气部件。
具体实施方式
下面结合说明书附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例仅用于说明本发明，但不能用来限制本发明的范围。
如图1所示，本发明的空调系统，包括连接成回路的压缩机1、四通阀2、室外换热器4、第一节流组件5和室内换热器10，所述述空调系统还包括由电子膨胀阀6、储液罐7、单向阀8及第二节流组件9依次串联的辅管路，所述辅管路并联于所述主管路中室外换热器4的出口与所述室内换热器10入口之间的管路；所述空调系统的主管路中设有压力传感器3，用来监测空调系统压力，所述空调系统设有控制器(图中未示出)，所述控制器分别与温度传感器41和电子膨胀阀8连接，用于根据温度传感器的信号控制电子膨胀阀6的开度，所述储液罐7的出口管管口设置于储液罐7的底部。
本发明的空调系统的控制方法如图2所示，包括以下步骤：
当空调器运行制冷模式时，监测空调系统压力Pd，并判断空调系统压力Pd是否大于系统第一预设压力Pds1，
当空调系统压力Pd≤系统第一预设压力Pds1时，控制器控制电子膨胀阀6关闭，空调系统按当前状态运行并持续监测系统压力；
当空调系统压力Pd>系统第一预设压力Pds1时，控制器控制电子膨胀阀6以预设开度打开，制冷剂进入储液罐，然后经储液罐7输出管输出，流经单向阀8和第二节流组件0后进入室内换热器，并持续监测系统压力。
当系统第二预设压力Pds2≥空调系统压力Pd>系统第一预设压力Pds1时，控制器控制电子膨胀阀6保持当前开度，空调系统按当前状态运行并持续监测系统压力；
当空调系统压力Pd>系统第二预设压力Pds2时，控制器控制电子膨胀阀6以预设速度增大开度，并持续监测系统压力。如此循环，根据系统压力Pd分别与系统第一预设压力Pds1和第二预设压力Pds2相比，控制器控制电子膨胀阀6的开度以控制储液罐内制冷剂的进入和输出。
其中，所述储液罐能够根据空调系统压力的变化调整储存或输出的制冷剂量。
在本发明的实施例中，空调系统运行制冷模式时，制冷剂的循环过程为：制冷剂经压缩机1压缩，流经四通阀2进入室外换热器4中换热，转变为中温高压制冷剂后经第一节流组件5进入室内换热器10中换热，换热后的制冷剂重新流入压缩机中1压缩。当压力超过预设压力值Pds1时，控制器控制电子膨胀阀6以预设开度开启，制冷剂流经电子膨胀阀6进入储液罐7中(其中储液罐进口管可不深入储液罐体中，而储液罐出口管需接入储液罐体底部，以使制冷剂能够及时输出)，然后制冷剂经过单项阀8和第二节流组件9节流后进入室内换热器10中换热，换热后重新流入压缩机中1压缩。当系统第二预设压力Pds2≥空调系统压力Pd>系统第一预设压力Pds1时，控制器控制电子膨胀阀6以预设速度增大开度，使更多的制冷剂进入储液罐7中。当系统压力再次小于等于预设 压力值Pds1时，控制器控制电子膨胀阀6关闭，储液罐中储存的制冷剂经第二节流组件重新回到系统中进行制冷，并继续监测空调系统压力，如此循环控制。
进而，在空调系统开始运行之前，需要在控制器内设定预定时间T0。可选地，预定时间可以是空调系统的出厂设置，也可以由用户自定义设置。由此，当空调系统开始运行制冷模式时，经预定时间后开启监测空调系统压力Pd，并判断其与系统第一预设压力和第二预设压力相比，控制器控制电子膨胀阀6的开度以控制储液罐内制冷剂的进入和输出。根据本发明的一些具体实施例，预定时间的取值范围可以为0s—60s，例如，预定时间可以为40s,通过设定40s的预定时间，可以避免室温开始变化时的变化率太大，使空调器对室内温度的调节较为平缓，从而在一定程度上提高用户的舒适度。
本发明所提供的空调系统及其控制方法在进行高温制冷时，能够控制空调系统在高温时储存制冷剂，并根据电子膨胀阀的开度进行系统制冷剂流量和压力的连续控制，实现了空调系统在高温时储存制冷剂，低温时制冷剂重新进入系统循环，系统运行稳定，降低系统运行负荷，利于环保，且提高了用户体验。
以上实施方式仅用于说明本发明，而非对本发明的限制。尽管参照实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，对本发明的技术方案进行各种组合、修改或者等同替换，都不脱离本发明技术方案的精神和范围，均应涵盖在本发明的权利要求范围当中。
工业实用性
本发明所述的空调系统及控制方法，在空调系统进行高温制冷时，能够控制空调系统在高温时储存制冷剂，并根据电子膨胀阀的开度进行系统制冷剂流量和压力的连续控制，使空调系统在高温时储存制冷剂，低温时制冷剂重新进入系统循环。可见，本发明提供的空调系统及控制方法，通过增加一由电子膨胀阀、储液罐、单向阀及第二节流 组件依次串联的辅管路，进而对空调系统的制冷剂流量和压力进行连续控制，以达到空调系统在高温时储存制冷剂，低温时制冷剂重新进入系统循环，系统运行稳定，降低系统运行负荷，利于环保的目的，即本发明具有工业实用性。

Claims (9)

  1. 一种空调系统，包括主管路，所述主管路包括连接成制冷回路或制热回路的压缩机、室外换热器、第一节流组件和室内换热器；其特征在于，所述空调系统还包括由电子膨胀阀、储液罐、单向阀及第二节流组件依次串联的辅管路，所述辅管路并联于所述主管路中室外换热器的出口与所述室内换热器入口之间的管路。
  2. 根据权利要求1所述的空调系统，其特征在于，所述压缩机通过四通阀与室外热交换器和室内热交换器连接。
  3. 根据权利要求1所述的空调系统，其特征在于，所述空调系统的主管路中设有压力传感器，用来监测空调系统压力。
  4. 根据权利要求3所述的空调系统，其特征在于，所述空调系统设有控制器，所述控制器分别与压力传感器和电子膨胀阀连接，用于根据压力传感器的信号控制电子膨胀阀的开度。
  5. 根据权利要求1所述的空调系统，其特征在于，所述储液罐的出口管管口设置于储液罐的底部。
  6. 根据权利要求1-5任意一项所述的空调系统，其特征在于，所述压缩机吸气口设置有回气部件，用于防止吸入压缩机的气体回流。
  7. 一种根据权利要求1-6任意一项所述的空调系统的控制方法，其特征在于，包括以下步骤：
    当空调器运行制冷模式时，监测空调系统压力Pd，并判断空调系统压力Pd是否大于系统第一预设压力Pds1，
    当空调系统压力Pd≤系统第一预设压力Pds1时，控制器控制电子膨胀阀关闭，空调系统按当前状态运行并持续监测系统压力；
    当空调系统压力Pd>系统第一预设压力Pds1时，控制器控制电子膨胀阀以预设开度打开，制冷剂进入储液罐，然后经储液罐输出管输出，流经单向阀和第二节流组件后进入室内换热器，并持续监测系统压力。
  8. 根据权利要求7所述的控制方法，其特征在于，包括以下步骤：
    当系统第二预设压力Pds2≥空调系统压力Pd>系统第一预设压力Pds1时，控制器控制电子膨胀阀保持当前开度，空调系统按当前状态运行并持续监测系统压力；
    当空调系统压力Pd>系统第二预设压力Pds2时，控制器控制电子膨胀阀以预设速度增大开度，并持续监测系统压力。
  9. 根据权利要求7或8所述的控制方法，其特征在于，所述储液罐能够根据空调系统压力的变化调整储存或输出的制冷剂量。
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