WO2018201851A1 - 分体式热泵空调和用于延缓其结霜的方法 - Google Patents

分体式热泵空调和用于延缓其结霜的方法 Download PDF

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Publication number
WO2018201851A1
WO2018201851A1 PCT/CN2018/082317 CN2018082317W WO2018201851A1 WO 2018201851 A1 WO2018201851 A1 WO 2018201851A1 CN 2018082317 W CN2018082317 W CN 2018082317W WO 2018201851 A1 WO2018201851 A1 WO 2018201851A1
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Prior art keywords
value
set value
gas flow
pressure
solenoid valve
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PCT/CN2018/082317
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English (en)
French (fr)
Inventor
马韵华
顾超
国德防
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Qingdao Haier Air Conditioning Electric Co Ltd
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Qingdao Haier Air Conditioning Electric Co Ltd
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    • 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

Definitions

  • the invention relates to the technical field of air conditioners, in particular to a split heat pump air conditioner and a method for delaying frosting thereof.
  • the outdoor heat pump air conditioner system When the outdoor heat pump air conditioner system is heating, when the outdoor ambient temperature is lower than the freezing point, the water vapor in the air will condense on the surface of the heat exchanger, and a frost layer will form on the surface of the heat exchanger as time changes.
  • the frosting directly increases the heat transfer resistance between the surface of the heat exchanger and the flowing air, so that the air flow through the heat exchanger is reduced, the heat exchange efficiency is reduced, and the heat exchange amount of the system is decreased, and the heating condition of the system is reduced. Deterioration, and therefore measures need to be taken to defrost.
  • the embodiment of the invention provides a split heat pump air conditioner and a method for delaying frosting thereof, and aims to solve the problem of how to delay frosting of the outdoor unit when the split heat pump air conditioner is used for heating.
  • a brief summary is given below. This generalization is not a general comment, nor is it intended to identify key/critical constituent elements or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the following detailed description.
  • a split heat pump air conditioner comprising a controller and an outdoor unit having a compressor and an outdoor heat exchanger, the outdoor heat exchanger having a gas flow port, and the gas flow port passing through a four
  • the valve is connected to the exhaust port or the return port of the compressor, and a bypass line is disposed between the exhaust port of the compressor and the gas flow port of the outdoor heat exchanger, and a solenoid valve is disposed on the bypass line;
  • the air port is provided with a pressure sensor for detecting the air pressure of the gas flow port;
  • the controller receives the air pressure value Ps detected by the air pressure sensor in the heating mode, and adjusts the opening degree of the electromagnetic valve according to the air pressure value Ps detected by the air pressure sensor, so that The gas pressure at the gas flow port is greater than or equal to the set pressure value P0.
  • the setting of P0 is related to the outdoor ambient temperature.
  • the value of P0 is inversely proportional to the outdoor ambient temperature.
  • P0 When the outdoor environment temperature is high and the outdoor unit is not prone to frost formation, P0 can be set smaller.
  • P0 can be set larger, as long as When the air pressure at the gas flow port of the outdoor heat exchanger is larger than P0, it can be judged that the pressure at the gas flow port is large, the surface temperature of the outdoor heat exchanger is high, and the outdoor machine is less likely to cause frost formation.
  • a method for delaying frosting of a split heat pump air conditioner comprising an outdoor unit having a compressor and an outdoor heat exchanger, the outdoor heat exchanger having a gas flow port
  • the gas circulation port is connected to the high-pressure exhaust body port or the return air port of the compressor through a four-way valve, and a bypass pipe is also arranged between the exhaust port of the compressor and the gas flow port of the outdoor heat exchanger, and the bypass is provided.
  • a solenoid valve is disposed on the pipeline; the method includes: detecting a gas pressure value Ps of the gas circulation port in the heating mode; adjusting the opening degree of the electromagnetic valve according to the air pressure value Ps, so that the gas pressure of the gas circulation port is greater than or equal to the set pressure value P0.
  • the gas flow port of the outdoor heat exchanger communicates with the gas return port of the compressor, and the gas flow port of the compressor exhaust port and the outdoor heat exchanger is further provided with a bypass pipe. Therefore, the high temperature and high pressure gas at the exhaust port of the compressor can flow to the gas circulation port of the outdoor heat exchanger through the bypass line, and the solenoid valve is disposed on the bypass line, and the controller adjusts the opening degree of the solenoid valve, that is, the control is compressed.
  • the flow rate of the high-temperature and high-pressure gas flowing to the gas flow port of the outdoor heat exchanger is such that the gas pressure at the gas flow port is greater than or equal to the set air pressure value P0, so that the pressure of the gas flow port of the outdoor heat exchanger can be maintained at all times.
  • the internal pressure of the outdoor heat exchanger is larger, and the surface temperature is higher, which effectively delays frosting of the outdoor unit. Therefore, the present invention can solve the problem of how to delay the frosting of the outdoor unit when the split heat pump air conditioner is used for heating. problem.
  • FIG. 1 is a schematic structural view of a split heat pump air conditioner according to an embodiment of the present invention
  • FIG. 2 is a schematic structural view of a controller of a split type heat pump air conditioner according to an embodiment of the present invention
  • FIG. 3 is a flow chart of a method for delaying frosting of a split heat pump air conditioner according to an embodiment of the present invention
  • FIG. 4 is a flow chart of a method for delaying frosting of a split heat pump air conditioner according to an embodiment of the present invention.
  • a first embodiment of the present invention provides a split heat pump air conditioner including a controller 10 and an outdoor unit having a compressor 20 and an outdoor heat exchanger 40.
  • the outdoor heat exchanger 40 has a gas flow port 41 through which the gas flow port 41 passes.
  • the four-way valve 30 is in communication with the exhaust port 21 or the return port 22 of the compressor 20, and a bypass line is provided between the exhaust port 21 of the compressor 20 and the gas flow port 41 of the outdoor heat exchanger 40, bypassing
  • a solenoid valve 60 is disposed on the pipeline; the gas flow port 41 is provided with a gas pressure sensor 50 for detecting the air pressure at the gas flow port 41; and the controller 10 receives the air pressure value Ps detected by the air pressure sensor 50 in the heating mode, and according to The air pressure value Ps detected by the air pressure sensor 50 adjusts the opening degree of the electromagnetic valve 60.
  • the setting of P0 is related to the outdoor ambient temperature.
  • the value of P0 is inversely proportional to the outdoor ambient temperature.
  • P0 can be set smaller.
  • P0 can be set larger, as long as
  • the air pressure at the gas flow port 41 of the outdoor heat exchanger 40 is larger than P0, it can be determined that the pressure at the gas flow port 41 is large, the surface temperature of the outdoor heat exchanger 40 is high, and the outdoor unit is less likely to cause frost formation.
  • the value range of P0 is the corresponding evaporation pressure when the refrigerant saturated evaporation temperature Ts is 0 to 2 ° C, and the saturated evaporation temperature Ts refers to the temperature of the refrigerant gas-liquid saturation state.
  • the value of P0 is related to the type of refrigerant selected. Different refrigerants have different values of P0. For example, R22 refrigerant has a corresponding pressure value of 0.35 MPa when the Ts is 0 °C.
  • the gas flow port 41 of the outdoor heat exchanger 40 communicates with the gas return port 22 of the compressor 20 through the four-way valve 30, and the exhaust port 21 of the compressor 20 and the outdoor heat exchanger
  • the gas flow port 41 of 40 is also provided with a bypass line, so that the high-temperature high-pressure gas at the exhaust port 21 of the compressor 20 can flow to the gas flow port 41 of the outdoor heat exchanger 40 through the bypass line, and is disposed on the bypass line.
  • the controller 10 is also used to adjust the opening degree of the solenoid valve 60, that is, to control the flow from the exhaust port 21 of the compressor 20.
  • the flow rate of the high-temperature high-pressure gas in the gas flow port 41 of the outdoor heat exchanger 40 is such that the gas pressure of the gas flow port 41 is greater than or equal to the set air pressure value P0, so that the pressure of the gas flow port 41 of the outdoor heat exchanger 40 can be maintained at all times.
  • the internal pressure of the outdoor heat exchanger 40 is larger, and the surface temperature is higher, which effectively delays frosting of the outdoor unit. Therefore, the present invention can solve the problem of how to delay the outdoor unit when the split heat pump air conditioner is used for heating. The problem.
  • a split heat pump air conditioner of the present embodiment includes a controller 10, a compressor 20, a four-way valve 30, an outdoor heat exchanger 40, an indoor heat exchanger 70, an air pressure sensor 50, and a solenoid valve 60.
  • the gas return port 22 of the compressor 20 is connected to the gas flow port 41 of the outdoor heat exchanger 40 through the four-way valve 30, and the exhaust port 21 of the compressor 20 passes through the four-way valve 30 and the indoor heat exchanger 70.
  • the air inlets 71 are connected, and the liquid outlet 72 of the indoor heat exchanger 70 is connected to the liquid inlet 42 of the outdoor heat exchanger 40 through a throttle valve (not shown), so that the outdoor heat exchange is performed in the heating mode.
  • the device 40 serves as an evaporator, the indoor heat exchanger 70 functions as a condenser, and a bypass line is provided between the gas flow port 41 of the outdoor heat exchanger 40 and the exhaust port 21 of the compressor 20, and is disposed on the bypass line.
  • a solenoid valve 60 and a gas flow port 41 of the outdoor heat exchanger 40 is provided with an air pressure sensor 50 for detecting the air pressure at the gas flow port 41, and the controller 10 receives the air pressure value Ps detected by the air pressure sensor 50 in the heating mode. And adjusting the opening of the solenoid valve 60 based on the air pressure value Ps detected by the air pressure sensor 50.
  • the gas pressure of the gas flow port 41 is made greater than or equal to the set air pressure value P0.
  • the setting of the set air pressure value P0 is as described above, and is not described herein again.
  • the exhaust port 21 of the compressor 20 and the indoor heat exchanger 70 are advanced.
  • the gas ports 71 are connected, and the high temperature and high pressure gaseous refrigerant releases heat in the indoor heat exchanger 70 for heating, and the liquid outlet 72 of the indoor heat exchanger 70 is connected to the liquid inlet 42 of the outdoor heat exchanger 40 through the throttle valve.
  • the normal temperature and normal pressure liquid refrigerant absorbs heat in the outdoor heat exchanger 40 and is vaporized by the four-way valve 30 from the gas return port 22 of the compressor 20 into the compressor 20 for compression and reuse, due to the outdoor heat exchanger 40
  • For absorbing heat when the pressure of the refrigerant in the outdoor heat exchanger 40 is low, the temperature in the outdoor heat exchanger 40 is low, and the surface of the outdoor heat exchanger 40 is prone to frost formation.
  • the row of the compressor 20 is arranged.
  • a bypass line is disposed between the gas port 21 and the gas flow port 41, and a solenoid valve 60 is disposed on the bypass line, the opening degree of the electromagnetic valve 60 is adjustable, and the gas flow port 41 is further provided with a pressure sensor 50, an air pressure sensor 50 for detecting the air pressure Ps at the gas flow port 41
  • the controller 10 is further configured to receive Ps, and adjust the opening degree of the electromagnetic valve 60 according to Ps, so that the air pressure at the gas flow port 41 is greater than or equal to the set air pressure value P0, so that the gas flow port 41 is
  • the air pressure is always maintained at a relatively high range, and since the refrigerant flows from the liquid inlet 42 of the outdoor heat exchanger 40 to the gas flow port 41, and the refrigerant flows under pressure, the gas in the outdoor heat exchanger 40
  • the pressure at the flow port 41 is high, the pressure at the liquid inlet port 42 of the outdoor heat exchanger 40 is also high, so that the pressure in the outdoor heat exchanger 40 is high and the temperature is high,
  • the controller 10 adjusts the opening degree of the solenoid valve 60 based on the air pressure value Ps detected by the air pressure sensor 50.
  • the controller 10 detects the air pressure sensor 50 based on the air pressure sensor 50.
  • the pressure difference ⁇ P between the air pressure value Ps and the set air pressure value P0 adjusts the opening degree of the solenoid valve 60.
  • the controller 10 adjusts the opening degree of the electromagnetic valve 60 according to the pressure difference ⁇ P between Ps and P0, so that the control method is simple in calculation and convenient in control.
  • the controller 10 further includes: a calculating unit 11 configured to calculate a pressure difference ⁇ P between the air pressure value Ps detected by the air pressure sensor 50 and the set air pressure value P0. a judging unit 12 for judging an area where the pressure difference ⁇ P is located; and an adjusting unit 13 for adjusting the solenoid valve 60 to an opening degree corresponding to a region where the pressure difference ⁇ P is located.
  • the pressure difference ⁇ P is calculated by the calculation unit 11, and then the determination unit 12 determines the region where the pressure difference ⁇ P is located, and finally adjusts the opening degree of the solenoid valve 60 according to the region where the pressure difference ⁇ P is located, thereby calculating The unit 11, the judging unit 12, and the adjusting unit 13, the controller 10 is capable of adjusting the opening degree of the solenoid valve 60 in accordance with the differential pressure ⁇ P, and can ensure that the opening degree of the solenoid valve 60 corresponds to the region where the differential pressure ⁇ P is located.
  • the adjusting unit 13 adjusts the electromagnetic valve 60 to the opening corresponding to the region where the pressure difference ⁇ P is located.
  • the adjusting unit 13 turns off the solenoid valve 60; when the pressure difference ⁇ P is smaller than the first set value A1 but greater than or equal to the second set value A2, the adjusting unit 13 opens the solenoid valve 60 The degree is adjusted to 1/4; when the pressure difference ⁇ P is smaller than the second set value A2 but greater than or equal to the third set value A3, the adjusting unit 13 adjusts the opening degree of the solenoid valve 60 to 1/2; when the pressure difference ⁇ P When it is less than the third set value A3 but greater than or equal to the fourth set value A4, the adjusting unit 13 adjusts the opening degree of the solenoid valve 60 to 3/4; when the pressure difference ⁇ P is smaller than the fourth set value A4, the adjusting unit 13 All solenoid valves 60 are opened; wherein A1
  • A1 can be taken between 0.04 and 0.05 Mpa, and the value of A1 is related to the safe temperature of the evaporator saturation temperature.
  • the safe temperature is generally 4 to 5 ° C, and the safe temperature is too low to ensure that the difference between the temperature at the gas flow port 41 and the saturated evaporation temperature Ts is greater than or When it is equal to the safe temperature, the surface of the outdoor heat exchanger 40 will certainly not be frosted, and the safe temperature is too high, which will seriously affect the heating effect of the air conditioner;
  • A1 is the pressure of the refrigerant corresponding to the safe temperature, when the pressure difference is ⁇ P
  • the ratio is greater than or equal to A1
  • the pressure at the gas flow port 41 is high, and the outdoor heat exchanger 40 does not cause frost formation at this time, and it is not necessary to transport the high temperature from the exhaust port 21 of the compressor 20 to the gas flow port 41.
  • the electromagnetic valve 60 is provided. With 4 different opening degrees, the pressure of the refrigerant corresponding to the safe temperature is 0.04 to 0.05 Mpa, and one opening interval of the solenoid valve 60 corresponds to the pressure adjustment area of 0.01 Mpa to 0.0125 Mpa, so A2 can subtract a pressure from A1.
  • the value is within the range of the adjustment area. For example, A2 can take a value between 0.03 and 0.04 MPa.
  • the adjusting unit 13 adjusts the opening degree of the electromagnetic valve 60 to 1/4, and controls the delivery of the high-temperature and high-pressure gaseous refrigerant with less, so that the requirement of the set pressure value P0 is greater than or equal to Let the pressure at the gas flow port 41 always be greater than or equal to P0, and delay the outdoor machine frosting; wherein A3 can be taken within the range of A1 minus two pressure adjustment areas, for example, A3 can be between 0.02 and 0.03Mpa. The value is set.
  • the adjustment unit 13 opens the electromagnetic valve 60. Adjust to 1/2, let At the exhaust port 21 of the compressor 20, a large amount of high-temperature and high-pressure gaseous refrigerant is discharged to the gas flow port 41, so that the pressure at the gas flow port 41 is always greater than or equal to P0, and the outdoor unit is frosted; wherein A4 can be subtracted from A3.
  • the value of the adjustment area is within the range, for example, A3 can be set between 0 and 0.02 MPa.
  • the gas is indicated.
  • the pressure at the flow port 41 is very low, and the adjusting unit 13 adjusts the opening degree of the solenoid valve 60 to 3/4, so that the pressure at the gas flow port 41 is always greater than or equal to P0, delaying frosting of the outdoor unit;
  • the pressure difference ⁇ P is smaller than At A4, it is considered that the pressure at the gas flow port 41 is extremely low, and the adjusting unit 13 opens all the solenoid valves 60, and a large amount of high-temperature and high-pressure gaseous refrigerant is supplied from the exhaust port 21 of the compressor 20 to the gas flow port, so that the gas flow port 41 is made.
  • the pressure at the place is always greater than or equal to P0, delaying frosting of the outdoor unit.
  • any of the above embodiments further comprising a temperature sensor (not shown) located near the gas flow port 41 for detecting the temperature Te at the gas flow port 41.
  • the controller 10 is further configured to adjust the values of A1, A2, A3, and A4 according to the difference ⁇ T between Te and the saturated evaporation temperature Ts.
  • the values of A1, A2, A3, and A4 when ⁇ T ⁇ 0 are smaller than the values of A1, A2, A3, and A4 when ⁇ T ⁇ 0, respectively.
  • the controller 10 is also capable of adjusting the values of A1, A2, A3, and A4 according to the difference between Te and Ts, so that the control of the air conditioner is more accurate.
  • ⁇ T Te-Ts.
  • a second embodiment of the present invention discloses a method for delaying a split heat pump air conditioner in any of the above embodiments. As shown in FIG. 3, the control method includes:
  • Step S301 detecting the gas pressure value Ps of the gas flow port in the heating mode.
  • Step S302 Adjust the opening degree of the solenoid valve according to the air pressure value Ps.
  • the gas flow port of the outdoor heat exchanger communicates with the gas return port of the compressor through the four-way valve, and the gas flow port of the compressor exhaust port and the outdoor heat exchanger is also provided with The bypass line, so the high temperature and high pressure gas at the exhaust port of the compressor can flow to the gas circulation port of the outdoor heat exchanger 40 through the bypass line, the electromagnetic valve is disposed on the bypass line, and the air conditioner passes through the heating mode in step S301.
  • the air pressure value PS at the gas flow port is detected, and then the opening degree of the electromagnetic valve is adjusted by step S302, so that the gas pressure of the gas flow port is greater than or equal to the set air pressure value P0, so that the pressure of the gas flow port of the outdoor heat exchange 0 can be made. It is always kept in a large range, so that the internal heat exchanger has a large internal pressure and a high surface temperature, which effectively delays frosting of the outdoor unit. Therefore, the present invention can solve the problem of how to delay the outdoor unit when the split heat pump air conditioner is used for heating. The problem of frost.
  • step S302 further includes: adjusting the opening degree of the electromagnetic valve according to the pressure difference ⁇ P between the air pressure value Ps and the set air pressure value P0.
  • the air conditioner adjusts the opening degree of the electromagnetic valve according to the pressure difference ⁇ P between PS and P0, so that the control method is simple in calculation and convenient in control.
  • step S302 further includes:
  • Step S3021 Calculate the pressure difference ⁇ P between the air pressure value Ps and the set air pressure value P0.
  • Step S3022 Determine the region where the differential pressure ⁇ P is located.
  • Step S3023 The solenoid valve is adjusted to an opening degree corresponding to the region where the pressure difference ⁇ P is located.
  • the air conditioner can calculate the pressure difference ⁇ P in step S3021, and can determine the region where the pressure difference ⁇ P is located in step S3022, and can adjust the opening degree of the solenoid valve according to the region where the pressure difference ⁇ P is located in step S3023.
  • the air conditioner can adjust the opening degree of the solenoid valve according to the pressure difference ⁇ P, and can ensure that the opening degree of the solenoid valve corresponds to the region where the pressure difference ⁇ P is located.
  • step S3023 specifically includes: closing the electromagnetic valve when the pressure difference ⁇ P is greater than or equal to the first set value A1; and when the pressure difference ⁇ P is less than the first set value A1 but greater than or equal to the first
  • the opening degree of the solenoid valve is adjusted to 1/4; when the pressure difference ⁇ P is smaller than the second set value A2 but greater than or equal to the third set value A3, the opening degree of the solenoid valve is adjusted to 1/2; when the pressure difference ⁇ P is smaller than the third set value A3 but greater than or equal to the fourth set value A4, the opening degree of the solenoid valve is adjusted to 3/4; when the pressure difference ⁇ P is smaller than the fourth set value A4 When the solenoid valve is fully opened, where A1>A2>A3>A4>0.
  • the setting of A1 is as described above, and is not described here.
  • the pressure difference ⁇ P is greater than or equal to A1
  • the pressure at the gas flow port 41 is high, so the air conditioner adjusts to close the solenoid valve 60 even if it is not from the compressor 20.
  • a high-temperature and high-pressure gaseous refrigerant is supplied to the gas flow port 41, and the outdoor heat exchanger 40 does not cause frost formation; wherein the setting of A2 is as described above, and the pressure difference ⁇ P is not described here.
  • the air conditioner adjusts the opening degree of the solenoid valve 60 to 1/4 as long as the conveying is performed.
  • Less high temperature and high pressure gaseous refrigerant can reach the requirement of greater than or equal to the set pressure value P0, so that the pressure at the gas flow port 41 is always greater than or equal to P0, delaying the outdoor machine frosting; wherein, the setting of A3 is as above
  • the pressure difference ⁇ P is smaller than the second set value A2 but greater than or equal to the third set value A3, the current pressure at the gas flow port 41 is low, and the air conditioner opens the solenoid valve 60.
  • the pressure at the gas flow port 41 is always greater than or equal to P0, delaying the frosting of the outdoor unit; when the pressure difference ⁇ P is less than A4, it is considered that the pressure at the gas flow port 41 is extremely low, the air conditioner opens all the solenoid valves 60, and the air conditioning control is compressed.
  • the exhaust port 21 of the machine 20 a large amount of high-temperature and high-pressure gaseous refrigerant is supplied to the gas circulation port, so that the pressure at the gas circulation port 41 is always greater than or equal to P0, and the outdoor unit is delayed in frosting.
  • the values of A1, A2, A3, and A4 are adjusted according to the difference ⁇ T between the temperature Te at the gas flow port 41 and the saturated evaporation temperature Ts.
  • the values of A1, A2, A3, and A4 when ⁇ T ⁇ 0 are smaller than the values of A1, A2, A3, and A4 when ⁇ T ⁇ 0, respectively.
  • A1 takes 0.04Mpa A1 takes 0.04Mpa
  • A3 takes 0.02Mpa
  • A4 takes 0Mpa
  • ⁇ T ⁇ 0 A1 takes 0.05Mpa
  • A2 takes 0.04Mpa
  • A3 takes 0.03Mpa
  • A4 takes 0.02Mpa.
  • the values of A1, A2, A3, and A4 are adjusted according to the difference between Te and Ts, so that the control of the air conditioner is more accurate.
  • ⁇ T Te-Ts.

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Abstract

一种分体式热泵空调，包括控制器（10）和具有压缩机（20）和室外热交换器（40）的室外机，室外热交换器（40）具有气体流通口（41），气体流通口（41）经过一四通阀（30）与压缩机（20）的排气口（21）或进气口（22）连通，压缩机（20）的排气口（21）和室外热交换器（40）的气体流通口（41）之间还设置有旁通管路，旁通管路上设置有电磁阀（60），气体流通口（41）设置有气压传感器（50），用于检测气体流通口（41）的气压，控制器（10）在制热模式下接收气压传感器（50）检测到的气压值Ps，并根据气压传感器（50）检测到的气压值Ps调节电磁阀（60）的开度，使气体流通口（41）的气压大于或等于设定气压值P0。上述结构能够有效延缓室外机结霜。

Description

分体式热泵空调和用于延缓其结霜的方法
本申请基于申请号为201710304764.3、申请日为2017年5月3日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及空调技术领域，特别涉及一种分体式热泵空调和用于延缓其结霜的方法。
背景技术
分体式热泵空调系统在制热的时候，当室外环境温度低于冰点时，空气中的水蒸气将会在换热器表面凝结，随着时间的变化，在换热器表面会形成霜层，结霜直接加大了换热器的表面与流动空气间的传热热阻，使得通过换热器的空气流通量减少，换热效率降低，导致系统换热量下降，系统的制热工况恶化，因而需要采取措施来除霜。
现有技术中，一般是针对空调室外机发生结霜以后再采取措施去除霜，一般采取室内制冷室外制热的控制模式来除霜，因此当室外机发生结霜时，会影响室内制热效果，而除霜过程，同样也会严重影响室内的制热效果，降低人体舒适度。
发明内容
本发明实施例提供了一种分体式热泵空调和用于延缓其结霜的方法，旨在解决当分体式热泵空调用于制热时如何延缓室外机结霜的问题。为了对披露的实施例的一些方面有一个基本的理解，下面给出了简单的概括。该概括部分不是泛泛评述，也不是要确定关键/重要组成元素或描绘这些实施例的保护范围。其唯一目的是用简单的形式呈现一些概念，以此作为后面的详细说明的序言。
根据本发明实施例的第一方面，提供了一种分体式热泵空调，包括控 制器和具有压缩机和室外热交换器的室外机，室外热交换器具有气体流通口，气体流通口经过一四通阀与压缩机的排气口或回气口连通，压缩机的排气口和室外热交换器的气体流通口之间还设置有旁通管路，旁通管路上设置有电磁阀；气体流通口设置有气压传感器，用于检测气体流通口的气压；控制器在制热模式下接收气压传感器检测到的气压值Ps，并根据气压传感器检测到的气压值Ps调节电磁阀的开度，使气体流通口的气压大于或等于设定气压值P0。P0的设定与室外环境温度相关联。P0的取值和室外环境温度成反比。当室外环境温度较高，室外机不易发生结霜时，P0可以设置的较小，当室外环境温度较低，制热过程中室外机容易发生结霜时，P0可以设置的较大，只要当室外热交换器气体流通口处的气压大于P0时，可以判定气体流通口处的压力较大，室外热交换器的表面温度较高，室外机不易发生结霜即可。
根据本发明实施例的第二方面，提供一种用于延缓分体式热泵空调结霜的方法，分体式热泵空调包括具有压缩机和室外热交换器的室外机，室外热交换器具有气体流通口，气体流通口经过一四通阀与压缩机的高压排气体口或回气口连通，压缩机的排气口和室外热交换器的气体流通口之间还设置有旁通管路，旁通管路上设置有电磁阀；方法包括：在制热模式下检测气体流通口的气压值Ps；根据气压值Ps调节电磁阀的开度，使气体流通口的气压大于或等于设定气压值P0。
本发明中，在空调运行制热模式时，室外热交换器的气体流通口与压缩机的回气口连通，压缩机的排气口与室外热交换器的气体流通口还设置有旁通管路，因此压缩机排气口处的高温高压气体能够通过旁通管路流向室外热交换器的气体流通口，旁通管路上设置有电磁阀，控制器调节电磁阀的开度，即控制从压缩机排气口流向室外热交换器的气体流通口的高温高压气体的流量，使气体流通口的气压大于或等于设定气压值P0，因此能够令室外热交换器的气体流通口的压力始终保持在一个较高的范围，令室外热交换器内部压力较大，表面温度较高，有效延缓室外机结霜，因此本发明能够解决当分体式热泵空调用于制热时如何延缓室外机结霜的问题。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本发明。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本发明的实施例，并与说明书一起用于解释本发明的原理。
图1是本发明实施例的分体式热泵空调的结构示意图；
图2是本发明实施例的分体式热泵空调的控制器的结构示意图；
图3是本发明实施例的用于延缓分体式热泵空调结霜的方法流程图；
图4是本发明实施例的用于延缓分体式热泵空调结霜的方法流程图。
附图标记说明：10、控制器；11、计算单元；12、判断单元；13、调节单元；20、压缩机；21、排气口；22、回气口；30、四通阀；40、室外热交换器；41、气体流通口；42、进液口；50、气压传感器；60、电磁阀；70、室内热交换器；71、进气口；72、出液口。
具体实施方式
以下描述和附图充分地示出本发明的具体实施方案，以使本领域的技术人员能够实践它们。实施例仅代表可能的变化。除非明确要求，否则单独的部件和功能是可选的。一些实施方案的部分和特征可以被包括在或替换其他实施方案的部分和特征。本发明的实施方案的范围包括权利要求书的整个范围，以及权利要求书的所有可获得的等同物。在本文中，各实施方案可以被单独地或总地用术语“发明”来表示，这仅仅是为了方便，并且如果事实上公开了超过一个的发明，不是要自动地限制该应用的范围为任何单个发明或发明构思。本文中，诸如第一和第二等之类的关系术语仅仅用于将一个实体与另一个实体区分开来，而不要求或者暗示这些实体之间存在任何实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素不仅包括那些要素，而且还包括没有明确列出的其他要素。本文中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对于实施例公开的结构、产品等而言，由于其与实施例公开的部分相对应，所以描述的比较简单，相关之处参见方法部分说明即可。
本发明第一实施例提供一种分体式热泵空调，包括控制器10和具有压缩机20和室外热交换器40的室外机，室外热交换器40具有气体流通口41，气体流通口41经过一四通阀30与压缩机20的排气口21或回气口22连通，压缩机20的排气口21和室外热交换器40的气体流通口41之间还设置有旁通管路，旁通管路上设置有电磁阀60；气体流通口41设置有气压传感器50，用于检测气体流通口41处的气压；控制器10在制热模式下接收气压传感器50检测到的气压值Ps，并根据气压传感器50检测到的气压值Ps调节电磁阀60的开度。
其中，P0的设定与室外环境温度相关联。P0的取值和室外环境温度成反比。当室外环境温度较高，室外机不易发生结霜时，P0可以设置的较小，当室外环境温度较低，制热过程中室外机容易发生结霜时，P0可以设置的较大，只要当室外热交换器40气体流通口41处的气压大于P0时，可以判定气体流通口41处的压力较大，室外热交换器40的表面温度较高，室外机不易发生结霜即可。
其中，P0的取值范围为制冷剂饱和蒸发温度Ts在0～2℃时对应的蒸发压力，饱和蒸发温度Ts指的是制冷剂气液饱和状态下的温度。P0的取值和所选制冷剂的种类相关。不同的制冷剂，P0的取值不同，例如R22制冷剂，其Ts为0℃时，对应的压力值为0.35Mpa。
本发明中，在空调运行制热模式时，室外热交换器40的气体流通口41通过四通阀30与压缩机20的回气口22连通，压缩机20的排气口21与室外热交换器40的气体流通口41还设置有旁通管路，因此压缩机20排气口21处的高温高压气体能够通过旁通管路流向室外热交换器40的气体流通口41，旁通管路上设置有电磁阀60，控制器10用于接收气压传感器50检测到的气体流通口41处的压力，控制器10还用于调节电磁阀60的开度，即控制从压缩机20排气口21流向室外热交换器40的气体流通口41的高温高压气体的流量，使气体流通口41的气压大于或等于设定气压值P0，因此能够令室外热交换器40的气体流通口41的压力始终保持在一个较高的范围，令室外热交换器40内部压力较大，表面温度较高，有效延缓室外机结霜，因此本发明能够解决当分体式热泵空调用于制热时如何延缓室外机结霜的问题。
如图1所示，本实施例的一种分体式热泵空调，包括控制器10、压缩机20、四通阀30、室外热交换器40、室内热交换器70、气压传感器50和电磁阀60，制热模式下，压缩机20的回气口22通过四通阀30与室外热交换器40的气体流通口41相连，压缩机20的排气口21通过四通阀30与室内热交换器70的进气口71相连，室内热交换器70的出液口72通过节流阀(图中未示出)和室外热交换器40的进液口42相连，因此制热模式下，室外热交换器40用作蒸发器，室内热交换器70用作冷凝器，室外热交换器40的气体流通口41和压缩机20的排气口21之间设置有旁通管路，旁通管路上设置有电磁阀60，室外热交换器40的气体流通口41设置有气压传感器50，用于检测气体流通口41处的气压，控制器10在制热模式下接收气压传感器50检测到的气压值Ps，并根据气压传感器50检测到的气压值Ps调节电磁阀60的开度，使气体流通口41的气压大于或等于设定气压值P0。
其中，设定气压值P0的设定如上所述，此处不再赘述，在本实施例中，当空调器用于制热时，压缩机20的排气口21与室内热交换器70的进气口71相连，高温高压的气态冷媒在室内热交换器70内释放热量用于制热，室内热交换器70的出液口72通过节流阀和室外热交换器40的进液口42相连，常温常压的液态冷媒在室外热交换器40内吸收热量气化，并通过四通阀30从压缩机20的回气口22进入压缩机20内部进行压缩和重复利用，由于室外热交换器40用于吸收热量，当室外热交换器40内冷媒压力较低时，室外热交换器40内温度较低，室外热交换器40表面容易发生结霜，本实施例中，在压缩机20的排气口21和气体流通口41之间设置了旁通管路，旁通管路上设置有电磁阀60，电磁阀60的开度可调，气体流通口41处还设置有气压传感器50，气压传感器50用于检测气体流通口41处的气压Ps，制热模式下，控制器10还用于接收Ps，并根据Ps调节电磁阀60的开度，令气体流通口41处的气压大于或等于设定气压值P0，令气体流通口41处的气压始终保持在一个较高的范围，由于冷媒是从室外热交换器40的进液口42处流向气体流通口41处，且冷媒是在压力作用下流动，因此当室外热交换器40的气体流通口41处的压力较高时，室外热交换器40的进液口42处的压力也较高，令室外热交换器40内的压力较高，温度较高， 有效延缓室外机结霜。
在上述实施例中，控制器10根据气压传感器50检测到的气压值Ps调节电磁阀60的开度有多种实施方式，作为一种可选的实施方式，控制器10根据气压传感器50检测到的气压值Ps和设定气压值P0之间的压差ΔP调节电磁阀60的开度。控制器10根据Ps和P0之间的压差ΔP调节电磁阀60的开度，令控制方法计算简单，控制方便。
可选的，在上述实施例中，如图2所示，控制器10还包括：计算单元11，用于计算气压传感器50检测到的气压值Ps和设定气压值P0之间的压差ΔP；判断单元12，用于判断压差ΔP所在的区域；和，调节单元13，用于将电磁阀60调节到对应于压差ΔP所在区域的开度。在本实施例中，通过计算单元11计算出压差ΔP，然后通过判断单元12，判断出压差ΔP所在的区域，最后根据压差ΔP所在的区域调节电磁阀60的开度，因此通过计算单元11、判断单元12和调节单元13，控制器10能够根据压差ΔP调节电磁阀60的开度，且能保证电磁阀60的开度与压差ΔP所在的区域相对应。
可选的，在上述实施例中，调节单元13将电磁阀60调节到对应于压差ΔP所在区域的开度的实施方式有多种，作为一种可选的实施方式，当压差ΔP大于或等于第一设定值A1时，调节单元13关闭电磁阀60；当压差ΔP小于第一设定值A1但大于或等于第二设定值A2时，调节单元13将电磁阀60的开度调节为1/4；当压差ΔP小于第二设定值A2但大于或等于第三设定值A3时，调节单元13将电磁阀60的开度调节为1/2；当压差ΔP小于第三设定值A3但大于或等于第四设定值A4时，调节单元13将电磁阀60的开度调节为3/4；当压差ΔP小于第四设定值A4时，调节单元13将电磁阀60全部打开；其中，A1＞A2＞A3＞A4＞0。其中A1可以在0.04～0.05Mpa之间进行取值，A1的取值和蒸发器饱和温度的安全温度有关，当气体流通口41处的温度与饱和蒸发温度Ts的差大于或等于安全温度时，室外热交换器40表面肯定不会发生结霜，其中安全温度一般取4～5℃，安全温度取的过低，不能够保证当气体流通口41处的温度与饱和蒸发温度Ts的差大于或等于安全温度时，室外热交换器40表面肯定不会发生结霜，安全温度取的过高，则会严重影响空调的制热效果；A1为安全温度对应的制冷剂的 压力，当压差ΔP大于或等于A1时，说明气体流通口41处的压力很高，此时室外热交换器40也不会发生结霜，不需要从压缩机20排气口21处向气体流通口41处输送高温高压的气态冷媒，因此调节单元13关闭电磁阀60；A2的取值和电磁阀60的开度区域设置和安全温度对应的制冷剂的压力有关，在本实施例中，电磁阀60设置了4个不同的开度，安全温度对应的制冷剂的压力为0.04～0.05Mpa，电磁阀60的一个开度区间对应0.01Mpa～0.0125Mpa的压力调节区域，因此A2可以在A1减去一个压力调节区域的范围之内进行取值，例如A2可以在0.03～0.04Mpa之间取值，当压差ΔP小于A1，且大于或等于A2，说明当前气体流通口41处的压力虽然较高，但是仍不能够满足不结霜的要求，调节单元13将电磁阀60的开度调节为1/4，控制输送较少的高温高压气态冷媒，就能够达到大于或等于设定气压值P0的要求，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜；其中A3可以在A1减去两个压力调节区域的范围之内进行取值，例如A3可以在0.02～0.03Mpa之间进行取值，当压差ΔP小于第二设定值A2但大于或等于第三设定值A3时，说明当前气体流通口41处的压力较低，因此调节单元13将电磁阀60的开度调节为1/2，令压缩机20排气口21处向气体流通口41排出较多的高温高压气态冷媒，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜；其中A4可以在A3减去三个调节区域的范围之内进行取值，例如A3可以在0～0.02Mpa之间进行取值，当压差ΔP小于第三设定值A3但大于或等于第四设定值A4时，说明气体流通口41处的压力很低，调节单元13将电磁阀60的开度调节为3/4，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜；当压差ΔP小于A4时，认为气体流通口41处的压力极低，调节单元13将电磁阀60全部打开，从压缩机20排气口21处向气体流通口处补充大量高温高压气态冷媒，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜。
可选的，在上述任一实施例中，还包括温度传感器(图中未示出)，所述温度传感器位于所述气体流通口41附近，用于检测气体流通口41处的温度Te，所述控制器10还用于根据Te与饱和蒸发温度Ts的差值ΔT调节A1、A2、A3和A4的取值。作为一种可选的实施方式，ΔT≥0时的A1、A2、A3和A4的取值分别小于ΔT＜0时的A1、A2、A3和A4的取值。进一 步可选的，当ΔT≥0时，A1取值0.04Mpa，A2取值0.03Mpa，A3取值0.02Mpa，A4取值0Mpa；当ΔT＜0时，A1取值0.05Mpa，A2取值0.04Mpa，A3取值0.03Mpa，A4取值0.02Mpa。在本实施例中，控制器10还能够根据Te和Ts的差值调节A1、A2、A3和A4的取值，令空调的控制更加精确。其中ΔT＝Te-Ts。
本发明第二实施例公开一种用于延缓上述任一实施例中的分体式热泵空调的方法，如图3所示，该控制方法包括：
步骤S301：在制热模式下检测气体流通口的气压值Ps。
步骤S302：根据气压值Ps调节电磁阀的开度。
其中，设定气压值P0的设定如上所述，此处不再赘述。本发明中，在空调运行制热模式时，室外热交换器的气体流通口通过四通阀与压缩机的回气口连通，压缩机的排气口与室外热交换器的气体流通口还设置有旁通管路，因此压缩机排气口处的高温高压气体能够通过旁通管路流向室外热交换器40的气体流通口，旁通管路上设置有电磁阀，空调通过步骤S301在制热模式下检测气体流通口处的气压值PS，然后通过步骤S302调节电磁阀的开度，令气体流通口的气压大于或等于设定气压值P0，因此能够令室外热交换0的气体流通口的压力始终保持在一个较大的范围，令室外热交换器内部压力较大，表面温度较高，有效延缓室外机结霜，因此本发明能够解决当分体式热泵空调用于制热时如何延缓室外机结霜的问题。
可选的，在上述实施例中，步骤S302还包括：根据气压值Ps和设定气压值P0之间的压差ΔP调节电磁阀的开度。空调根据PS和P0之间的压差ΔP调节电磁阀的开度，令控制方法计算简单，控制方便。
可选的，在上述实施例中，如图4所示，步骤S302还包括：
步骤S3021：计算气压值Ps和设定气压值P0之间的压差ΔP。
步骤S3022：判断压差ΔP所在的区域。
步骤S3023：将电磁阀调节到对应于压差ΔP所在区域的开度。
在本实施例中，空调通过步骤S3021能够计算出压差ΔP，通过步骤S3022能够判断出压差ΔP所在的区域，通过步骤S3023还能够根据压差ΔP所在的区域调节电磁阀的开度，因此通过本实施例，空调能够根据压差ΔP调节电磁阀的开度，且能保证电磁阀的开度与压差ΔP所在的区域相对应。
可选的，在上述实施例中，步骤S3023具体包括：当压差ΔP大于或等于第一设定值A1时，关闭电磁阀；当压差ΔP小于第一设定值A1但大于或等于第二设定值A2时，将电磁阀的开度调节为1/4；当压差ΔP小于第二设定值A2但大于或等于第三设定值A3时，将电磁阀的开度调节为1/2；当压差ΔP小于第三设定值A3但大于或等于第四设定值A4时，将电磁阀的开度调节为3/4；当压差ΔP小于第四设定值A4时，将电磁阀全部打开；其中，A1＞A2＞A3＞A4＞0。其中A1的设定如上所述，此处不再赘述，当压差ΔP大于或等于A1时，说明气体流通口41处的压力很高，因此空调调节关闭电磁阀60，即使不从压缩机20排气口21处向气体流通口41处输送高温高压的气态冷媒，室外热交换器40也不会发生结霜；其中，A2的设定如上所述，此处不再赘述，当压差ΔP小于A1，且大于或等于A2，说明当前气体流通口41处的压力虽然不能够满足不结霜的要求，但是也比较高，因此空调将电磁阀60的开度调节为1/4，只要输送较少的高温高压气态冷媒，就能够达到大于或等于设定气压值P0的要求，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜；其中，A3的设定如上所述，此处不再赘述，当压差ΔP小于第二设定值A2但大于或等于第三设定值A3时，说明当前气体流通口41处的压力较低，空调将电磁阀60的开度调节为1/2，令压缩机20排气口21处向气体流通口41排出较多的高温高压气态冷媒，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜；其中A4的设定如上所述，此处不再赘述，当压差ΔP小于第三设定值A3但大于或等于第四设定值A4，说明气体流通口41处的压力很低，空调将电磁阀60的开度调节为3/4，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜；当压差ΔP小于A4时，认为气体流通口41处的压力极低，空调将电磁阀60全部打开，空调控制从压缩机20排气口21处向气体流通口处补充大量高温高压气态冷媒，令气体流通口41处的压力始终大于或等于P0，延缓室外机结霜。
可选的，在上述任一实施例中，根据气体流通口41处的温度Te和饱和蒸发温度Ts的差值ΔT调节A1、A2、A3和A4的取值。作为一种可选的实施方式，ΔT≥0时的A1、A2、A3和A4的取值分别小于ΔT＜0时A1、A2、A3和A4的取值。进一步可选的，ΔT≥0时，A1取值0.04Mpa，A2取值 0.03Mpa，A3取值0.02Mpa，A4取值0Mpa；ΔT＜0时，A1取值0.05Mpa，A2取值0.04Mpa，A3取值0.03Mpa，A4取值0.02Mpa。在本实施例中，根据Te和Ts的差值调节A1、A2、A3和A4的取值，令空调的控制更加精确。其中ΔT＝Te-Ts。
应当理解的是，本发明并不局限于上面已经描述并在附图中示出的流程及结构，并且可以在不脱离其范围进行各种修改和改变。本发明的范围仅由所附的权利要求来限制。

Claims (10)

  1. 一种分体式热泵空调，包括控制器和具有压缩机和室外热交换器的室外机，所述室外热交换器具有气体流通口，所述气体流通口经过一四通阀与所述压缩机的排气口或回气口连通，其特征在于，所述压缩机的排气口和所述室外热交换器的气体流通口之间还设置有旁通管路，所述旁通管路上设置有电磁阀；所述气体流通口设置有气压传感器，用于检测所述气体流通口的气压；所述控制器在制热模式下接收所述气压传感器检测到的气压值Ps，并根据所述气压传感器检测到的气压值Ps调节所述电磁阀的开度。
  2. 如权利要求1所述的分体式热泵空调，其特征在于，所述控制器根据所述气压传感器检测到的气压值Ps和所述设定气压值P0之间的压差ΔP调节所述电磁阀的开度。
  3. 如权利要求2所述的分体式热泵空调，其特征在于，所述控制器包括：
    计算单元，用于计算所述气压传感器检测到的气压值Ps和所述设定气压值P0之间的压差ΔP；
    判断单元，用于判断所述压差ΔP所在的区域；和，
    调节单元，用于将所述电磁阀调节到对应于所述压差ΔP所在区域的开度。
  4. 如权利要求3所述的分体式热泵空调，其特征在于，
    当所述压差ΔP大于或等于第一设定值A1时，所述调节单元关闭所述电磁阀；
    当所述压差ΔP小于所述第一设定值A1但大于或等于第二设定值A2时，所述调节单元将所述电磁阀的开度调节为1/4；
    当所述压差ΔP小于所述第二设定值A2但大于或等于第三设定值A3时，所述调节单元将所述电磁阀的开度调节为1/2；
    当所述压差ΔP小于所述第三设定值A3但大于或等于第四设定值A4时，所述调节单元将所述电磁阀的开度调节为3/4；
    当所述压差ΔP小于所述第四设定值A4时，所述调节单元将所述电磁阀全部打开；其中，A1＞A2＞A3＞A4＞0。
  5. 如权利要求4所述的分体式热泵空调，其特征在于，还包括：
    温度传感器，所述温度传感器位于所述气体流通口处，用于检测气体流通口的温度Te，所述控制器还用于根据所述温度Te与饱和蒸发温度Ts的差值调节第一设定值A1、第二设定值A2、第三设定值A3和第四设定值A4的取值。
  6. 一种用于延缓分体式热泵空调结霜的方法，其特征在于，所述方法包括：
    在制热模式下检测所述气体流通口的气压值Ps；
    根据所述气压值Ps调节所述电磁阀的开度。
  7. 如权利要求5所述的方法，其特征在于，根据所述气压值Ps和所述设定气压值P0之间的压差ΔP调节所述电磁阀的开度。
  8. 如权利要求6所述的方法，其特征在于，所述根据气压值Ps和设定气压值P0之间的压差ΔP调节电磁阀的开度，包括：
    计算所述气压值Ps和所述设定气压值P0之间的压差ΔP；
    判断所述压差ΔP所在的区域；和，
    将所述电磁阀调节到对应于所述压差ΔP所在区域的开度。
  9. 如权利要求7所述的方法，其特征在于，所述将电磁阀调节到对应于压差ΔP所在区域的开度，包括：
    当所述压差ΔP大于或等于第一设定值A1时，关闭所述电磁阀；
    当所述压差ΔP小于所述第一设定值A1但大于或等于第二设定值A2时，将所述电磁阀的开度调节为1/4；
    当所述压差ΔP小于所述第二设定值A2但大于或等于第三设定值A3时，将所述电磁阀的开度调节为1/2；
    当所述压差ΔP小于所述第三设定值A3但大于或等于第四设定值A4时，将所述电磁阀的开度调节为3/4；
    当所述压差ΔP小于所述第四设定值A4时，将所述电磁阀全部打开；其中，A1＞A2＞A3＞A4＞0。
  10. 如权利要求9所述的方法，其特征在于，还包括：
    根据气体流通口处的温度和饱和蒸发温度的差值调节所述第一设定值A1、所述第二设定值A2、所述第三设定值A3和所述第四设定值A4的取值。
PCT/CN2018/082317 2017-05-03 2018-04-09 分体式热泵空调和用于延缓其结霜的方法 Ceased WO2018201851A1 (zh)

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