WO2021088363A1 - Air conditioning system and control method therefor - Google Patents

Air conditioning system and control method therefor Download PDF

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Publication number
WO2021088363A1
WO2021088363A1 PCT/CN2020/094847 CN2020094847W WO2021088363A1 WO 2021088363 A1 WO2021088363 A1 WO 2021088363A1 CN 2020094847 W CN2020094847 W CN 2020094847W WO 2021088363 A1 WO2021088363 A1 WO 2021088363A1
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Prior art keywords
temperature
heat exchanger
outdoor heat
conditioning system
bypass
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PCT/CN2020/094847
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French (fr)
Chinese (zh)
Inventor
刘江彬
宋强
任滔
刘景升
孟庆良
李银银
荣丹
Original Assignee
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2021088363A1 publication Critical patent/WO2021088363A1/en

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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
    • 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
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity

Definitions

  • the invention relates to the technical field of air conditioning, and specifically provides an air conditioning system and a control method thereof.
  • air conditioners are widely used in people's lives.
  • the air conditioner realizes the switching between the cooling mode and the heating mode by changing the flow direction of the refrigerant in the circulation loop, so as to meet the cooling demand in summer and heating demand in winter.
  • the heat pump air conditioning system is in heating mode in winter, the outer surface of the outdoor heat exchanger is often frosted, and the heat exchange performance of the outdoor heat exchanger is reduced, resulting in a serious decrease in the heating capacity of the air conditioning system, which affects the air conditioning. Normal heating of the system.
  • the improved air conditioner has a defrosting function.
  • the flow direction of the refrigerant in the circulation loop is changed, so that the high-temperature gaseous refrigerant discharged from the compressor flows into the outdoor heat exchanger, thereby reducing the outdoor heat exchanger
  • the melting of the frost on the outer surface reduces the influence of the frost layer on the heating capacity of the air conditioner to a certain extent.
  • the air conditioner with defrosting function only defrosts after the surface of the outdoor heat exchanger is frosted to reduce the influence of the frost layer on the heating capacity of the air conditioner, but it does not eliminate the effect of the frost layer on the air conditioner.
  • the influence of thermal capacity is only defrosts after the surface of the outdoor heat exchanger is frosted to reduce the influence of the frost layer on the heating capacity of the air conditioner, but it does not eliminate the effect of the frost layer on the air conditioner. The influence of thermal capacity.
  • one aspect of the present invention provides a control method of an air conditioning system.
  • the air conditioning system includes a compressor, a four-way reversing valve, an indoor heat exchanger, and an outdoor heat exchanger.
  • the compressor, the four-way reversing valve, the indoor heat exchanger, and the outdoor heat exchanger are connected to form Circulation loop
  • the outdoor heat exchanger includes a first outdoor heat exchanger and a second outdoor heat exchanger sequentially distributed along the airflow direction of the outdoor fan
  • the outer surface of the first outdoor heat exchanger is provided with an adsorption layer
  • the air conditioning system further includes a first bypass pipeline and a second bypass pipeline. In the heating mode, part of the refrigerant discharged from the compressor can pass into the first outdoor room through the first bypass pipeline.
  • the heat exchanger or part of the refrigerant flowing out of the indoor heat exchanger can be passed into the first outdoor heat exchanger through the second bypass line, and the control method includes the following steps: obtaining air flow in a heating mode The first temperature and the first humidity before flowing through the first outdoor heat exchanger and the second temperature and the second humidity after the airflow passes through the first outdoor heat exchanger; according to the first temperature, the The second temperature, the first humidity, and the second humidity selectively switch the conduction state of the first bypass line, the conduction state of the second bypass line, and the air conditioning system Operating mode.
  • steps of “state, the conduction state of the second bypass line, and the operation mode of the air-conditioning system” include: obtaining a first dew point temperature according to the first temperature and the first humidity; and obtaining a first dew point temperature according to the second temperature and The second humidity obtains a second dew point temperature; calculates the difference between the first dew point temperature and the second dew point temperature; compares the difference value with the first threshold value, and compares the result with the first temperature
  • the conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air conditioning system are selectively switched.
  • the conduction state of the first bypass line, the conduction state of the second bypass line, and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature.
  • the step of "operation mode of the air conditioning system” includes: if the difference is less than the first threshold and the first temperature is greater than the second threshold, making the first bypass pipe or the second bypass pipe The road is in a conducting state.
  • the conduction state of the first bypass line, the conduction state of the second bypass line, and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature.
  • the operation mode of the air-conditioning system includes: if the difference is less than the first threshold and the first temperature is not greater than the second threshold, making the first bypass line and the second The bypass lines are all in a disconnected state and the air conditioning system is switched to the cooling mode.
  • the conduction state of the first bypass line, the conduction state of the second bypass line, and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature.
  • the step of "operation mode of the air-conditioning system” includes: if the difference is not less than the first threshold, both the first bypass pipeline and the second bypass pipeline are in a disconnected state.
  • the method before the step of "making the first bypass pipeline or the second bypass pipeline in a conducting state", the method further includes: acquiring the indoor ambient temperature;
  • the step of "a bypass pipeline or the second bypass pipeline is in a conductive state” includes: if the indoor ambient temperature is greater than a third threshold, the first bypass pipeline is in a conductive state.
  • the step of "making the first bypass pipe or the second bypass pipe in a conducting state" includes: if the indoor ambient temperature is not greater than the third Threshold, the second bypass line is in a conducting state.
  • control method includes: disconnecting the first bypass pipeline after the first bypass pipeline is conducted for a first set time; or After the two bypass pipelines are conducted for a second set time period, the second bypass pipeline is disconnected; wherein, the first set time period is less than the second set time period.
  • the first set duration and/or the second set duration are determined according to the outdoor ambient temperature.
  • the air conditioning system includes a compressor, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger, a compressor, a four-way reversing valve, and an indoor heat exchanger.
  • the heat exchanger and the outdoor heat exchanger are connected to form a circulation loop.
  • the outdoor heat exchanger includes a first outdoor heat exchanger and a second outdoor heat exchanger that are sequentially distributed along the airflow direction of the outdoor fan.
  • the outer surface of the first outdoor heat exchanger is arranged With an adsorption layer, the air conditioning system also includes a first bypass pipeline and a second bypass pipeline.
  • part of the refrigerant discharged from the compressor can pass into the first outdoor heat exchanger through the first bypass pipeline or Part of the refrigerant flowing out of the indoor heat exchanger can be passed into the first outdoor heat exchanger through the second bypass line, and the control method includes the following steps: in the heating mode, obtaining airflow before flowing through the first outdoor heat exchanger The first temperature and the first humidity, and the second temperature and the second humidity after the air flows through the first outdoor heat exchanger; according to the first temperature, the second temperature, the first humidity, and the The second humidity selectively switches the conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air conditioning system.
  • the first temperature and the first humidity before the air flow through the first outdoor heat exchanger and the second temperature and the second humidity after the air flow through the first outdoor heat exchanger are acquired, according to the first temperature, The second temperature, the first humidity, and the second humidity determine whether the adsorption layer needs to be heated to regenerate it.
  • the first bypass pipeline and the second bypass pipeline are in a disconnected state, and the air conditioning system maintains the heating operation mode.
  • the adsorption on the outer surface of the first outdoor heat exchanger The layer adsorbs the moisture in the airflow passing through, which reduces the humidity of the airflow, thereby reducing the dew point temperature of the airflow; when it is determined that the adsorption layer needs to be heated to regenerate it, the air conditioning system is switched to the cooling mode, or the first side
  • the duct is in the conducting state, or the second bypass duct is in the conducting state, the high-temperature refrigerant enters the first outdoor heat exchanger to heat the adsorption layer and regenerate it, so that the adsorption layer can be used in the heating process of the air conditioning system
  • the moisture in the airflow is continuously absorbed to reduce the dew point temperature of the airflow, thereby avoiding frosting on the outer surface of the outdoor heat exchanger in the air-conditioning system in the heating mode, and completely eliminating the influence of the frost layer on the heating capacity of the air-conditioning system.
  • the present invention also provides an air-conditioning system, which includes a controller, and the controller is used to execute any one of the above-mentioned control methods. It should be noted that the air-conditioning system has all the technical effects of the above-mentioned control method of the air-conditioning system.
  • Figure 1 is a schematic diagram of the main steps of the control method of the air conditioning system of the present invention
  • FIG. 2 is a schematic diagram of specific steps of the control method of the air conditioning system of the present invention.
  • Fig. 3 is a schematic structural diagram of a multi-connected air-conditioning system according to an embodiment of the present invention.
  • the terms “installation”, “setting”, and “connection” should be understood in a broad sense, for example, it may be a fixed connection or It is a detachable connection or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication between two components.
  • the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.
  • Figure 1 is a schematic diagram of the main steps of the control method of the air conditioning system of the present invention
  • Figure 2 is a schematic diagram of the specific steps of the control method of the air conditioning system of the present invention
  • Figure 3 is a multi-connected air conditioner according to an embodiment of the present invention Schematic diagram of the system structure.
  • the air conditioning system includes a compressor, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger.
  • the compressor, the four-way reversing valve, the indoor heat exchanger and the outdoor heat exchanger are connected to form a circulation loop.
  • the outdoor heat exchanger includes The first outdoor heat exchanger and the second outdoor heat exchanger are sequentially distributed along the airflow direction of the outdoor fan.
  • the outer surface of the first outdoor heat exchanger is provided with an adsorption layer.
  • the air conditioning system also includes a first bypass pipeline and a second Bypass pipeline, in heating mode, part of the refrigerant discharged from the compressor can pass into the first outdoor heat exchanger through the first bypass pipeline or part of the refrigerant flowing out of the indoor heat exchanger can pass through the second bypass pipeline Access the first outdoor heat exchanger.
  • the air-conditioning system includes a controller, and the controller is used in a control method of the air-conditioning system.
  • control method of the air conditioning system mainly includes the following steps:
  • a first temperature and a first humidity before the airflow flows through the first outdoor heat exchanger and a second temperature and a second humidity after the airflow flows through the first outdoor heat exchanger in the heating mode For example, a first temperature sensor and a first humidity sensor are arranged outside the first outdoor heat exchanger, and a second temperature sensor and a second humidity sensor are arranged between the first outdoor heat exchanger and the second outdoor heat exchanger.
  • the first temperature sensor and the first humidity sensor respectively detect the first temperature and the first humidity before the air flows through the first outdoor heat exchanger
  • the second temperature sensor and the second humidity sensor respectively detect the outdoor air flow
  • the second temperature and second humidity after the first outdoor heat exchanger wherein, the first humidity and the second humidity are both relative humidity.
  • step S200 includes the following steps:
  • the first dew point temperature can be obtained according to the first temperature and the first humidity and the second dew point temperature can be obtained according to the second temperature and the second humidity in a table look-up manner.
  • the memory stores the correspondence table of humidity, temperature and dew point
  • the controller obtains the corresponding first dew point temperature from the correspondence table stored in the memory according to the first temperature and the first humidity, and obtains the corresponding first dew point temperature according to the second temperature and the second humidity.
  • the corresponding second dew point temperature is obtained from the correspondence table stored in the memory.
  • the current outdoor environment temperature (the first temperature) can be obtained by looking up the table.
  • the Pqb value corresponding to the outdoor ambient temperature, and then the corresponding dew point temperature t is calculated by the above two formulas.
  • the first threshold is set to 5°C and the second threshold is set to 0°C
  • the calculated first dew point temperature is -3°C and the second dew point temperature is -5°C
  • the difference between the first dew point temperature and the second dew point temperature (2°C) is less than the first threshold (5°C)
  • the first temperature is -6°C less than the second threshold (0°C)
  • the four-way control is now controlled.
  • the direction of the reversing valve changes, the air conditioning system switches to the refrigeration mode, and the high-temperature gaseous refrigerant discharged from the compressor enters the first outdoor heat exchanger to heat the adsorption layer on the surface to regenerate the adsorption layer.
  • first threshold value of 5°C and the second threshold value of 0°C are only an exemplary description, and those skilled in the art can adjust them as needed to adapt to specific applications, such as the first threshold value. It can be 3°C, 6°C, etc., and the second threshold can be -2°C, 1°C, or the like.
  • the second bypass pipeline is put in a conducting state.
  • the difference is less than the first threshold, it means that the adsorption layer has adsorbed more water at this time, and the water absorption capacity of the adsorption layer has decreased. At this time, the adsorption layer needs to be heated to evaporate the adsorbed water so as to further adsorb and flow through the outdoor. Moisture in the airflow of the heat exchanger.
  • the first temperature is not greater than the second threshold, it means that the outdoor temperature is low. At this time, the four-way reversing valve is switched, and the air conditioning system is switched to the cooling mode, so that a large amount of gaseous refrigerant flows into the first outdoor heat exchanger. The adsorption layer is quickly heated to regenerate it.
  • the difference is less than the first threshold and the first temperature is greater than the second threshold, it means that the outdoor temperature is relatively high at this time and the adsorption layer adsorbs more water.
  • the first bypass pipeline can be turned on. Or make the second bypass pipe in a conducting state, so as to heat the adsorption layer on the surface of the first outdoor heat exchanger.
  • the indoor ambient temperature is greater than the third threshold, the indoor temperature is relatively high at this time, so that the first bypass pipeline is in a conducting state, and part of the gaseous refrigerant discharged from the compressor is passed into the first outdoor heat exchanger. The gaseous refrigerant entering the indoor heat exchanger is reduced, but the indoor ambient temperature will not reach a lower temperature.
  • the second bypass pipeline When the indoor environment temperature is not greater than the third threshold, the second bypass pipeline is in a conducting state, and part of the liquid refrigerant flowing out of the indoor heat exchanger is passed into the first outdoor heat exchanger, which ensures that it enters the indoor heat exchanger.
  • the amount of gaseous refrigerant in the heater ensures the heating efficiency of the room and realizes the heating and regeneration of the adsorption layer. Through this control method, the indoor environment temperature is avoided to be too low, and the indoor comfort is ensured.
  • the third threshold is not limited to 26°C, and those skilled in the art can set it according to specific conditions.
  • the third threshold may be 22°C, 24°C, 25°C, and so on.
  • the difference is not less than the first threshold, it indicates that the adsorption layer has strong water absorption capacity at this time, so that the first bypass pipeline and the second bypass pipeline remain disconnected, and the air conditioning system is in a normal heating state.
  • the adsorption layer adsorbs the moisture in the airflow flowing through the first outdoor heat exchanger, so that the humidity of the airflow is reduced, thereby reducing its dew point temperature, and avoiding frosting on the surfaces of the first outdoor heat exchanger and the second outdoor heat exchanger.
  • the indoor ambient temperature may not be acquired, and the One is in the conducting state, such as when the difference is less than the first threshold and the first temperature is greater than the second threshold, the first bypass pipeline and the second bypass pipeline are alternately conducted, such as the first bypass pipeline After being turned on for 2 minutes, it will be disconnected, and then the second bypass line will be turned on for 1 min, after which the second bypass line will be disconnected, and the first bypass line will be turned on for 2 minutes, and the conduction will be performed alternately.
  • the regeneration efficiency of the adsorption layer is improved compared to the mode that only conducts the second bypass pipe.
  • the first dew point temperature is obtained according to the first temperature and the first humidity
  • the second dew point temperature is obtained according to the second temperature and the second humidity
  • the difference between the first dew point temperature and the second dew point temperature is calculated.
  • the difference between the absolute humidity and the second absolute humidity and the first temperature determine whether to selectively switch the conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air conditioning system. It's just that the absolute humidity value is small, and the error in judgment is relatively large.
  • control method further includes step S251, disconnecting the first bypass line after the first bypass line is turned on for a first set period of time.
  • control method further includes step S252, disconnecting the second bypass line after the second bypass line is turned on for a second set period of time. Wherein, the first set duration is less than the second set duration.
  • the first set duration is 20min
  • the second set duration is 30min.
  • the first bypass pipeline is in the conducting state
  • part of the high-temperature gaseous refrigerant is passed into the first outdoor heat exchanger, and the efficiency of heating the adsorption layer is relatively high
  • the second bypass pipeline is in the conducting state
  • Passing part of the high-temperature liquid refrigerant into the first outdoor heat exchanger has relatively low heating efficiency for the adsorption layer. Therefore, the first set time period is smaller than the second set time period.
  • excessive heating time of the adsorption layer is avoided, and the operation of heating the adsorption layer has less effect on the heating capacity of the air conditioning system. influences.
  • first set duration of 20 minutes and the second set duration of 30 minutes are only an exemplary description. Those skilled in the art can make adjustments to the first set duration and the second set duration according to actual conditions. Adjust the set duration to suit specific applications.
  • the first set duration can be 15min, 18min, 22min, etc.
  • the second set duration can be 23min, 25min, 28min, etc.
  • the first set duration and the second set duration can be determined according to the first temperature.
  • the first temperature is greater than 6°C
  • the first set duration is 16min
  • the second set duration is 24min
  • the first temperature is greater than -2°C and not greater than 6°C
  • the first set duration is 18min
  • the second setting duration is 27min
  • the first temperature is not greater than -2°C
  • the first setting duration is 22min
  • the second setting duration is 35min. Since the first temperature is lower, that is, the outdoor environment temperature is lower, when the first bypass pipeline or the second bypass pipeline is conducted to heat the adsorption layer through the high-temperature refrigerant, the more heat is dissipated to the outdoor environment.
  • Heating the adsorption layer causes the amount of heat to evaporate the adsorbed water is relatively reduced.
  • increasing the first set time period and the second set time period can ensure the regeneration of the adsorption layer. It can be understood that the temperature interval in which the first temperature is located, the corresponding first set duration, and the corresponding second duration can be set according to specific conditions.
  • the air-conditioning system includes a controller, and the controller is used to execute any one of the above-mentioned control methods.
  • the multi-line air conditioning system includes a compressor 1, a four-way reversing valve 2, 4 indoor heat exchangers 3, a first outdoor heat exchanger 41, and a second outdoor heat exchanger. Heat exchanger 42.
  • the compressor 1, the four-way reversing valve 2, the four indoor heat exchangers 3, the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 are connected to form a circulation loop.
  • the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 are sequentially distributed along the airflow direction of the outdoor fan (not shown in the figure), and the outer surface of the first outdoor heat exchanger 41 is provided with an adsorption layer (not shown in the figure) Out), such as silicone coating.
  • the adsorption layer can also be a potassium carbonate coating or other suitable renewable adsorbent coatings.
  • the exhaust port of the compressor 1 and the first port of the four-way reversing valve 2 are connected by a pipeline, and a first port is provided between the exhaust port of the compressor 1 and the first port of the four-way reversing valve 2
  • the oil separator 51 and the oil return port of the oil separator 51 are connected to the suction port of the compressor 1.
  • the first ends of the four indoor heat exchangers 3 are all connected to the second port of the four-way reversing valve 2, the second end of each indoor heat exchanger 3 is connected to the indoor electronic expansion valve 61, and the indoor electronic expansion valve 61 is connected
  • the high-pressure accumulator 53 is respectively connected to the first end of the first outdoor heat exchanger 41 and the first end of the second outdoor heat exchanger 42 through two branches, the high-pressure accumulator 53 and
  • a first valve 71 is provided on the branch between the first outdoor heat exchanger 41, a first outdoor electronic expansion valve 62 is provided between the first valve 71 and the first outdoor heat exchanger 41, and the high-pressure accumulator 53 is connected to the first outdoor heat exchanger 41.
  • a second outdoor electronic expansion valve 63 is provided on the branch between the two outdoor heat exchangers 42, and the second end of the first outdoor heat exchanger 41 and the second end of the second outdoor heat exchanger 42 are both connected to the four-way exchange
  • the third port of the valve 2 and the fourth port of the four-way reversing valve 2 are connected to the gas-liquid separator 54, and the gas-liquid separator 54 is connected to the suction port of the compressor 1.
  • the air conditioning system also includes a first bypass pipeline and a second bypass pipeline.
  • the first end of the first bypass pipeline is connected to the pipe between the oil separator 51 and the first interface of the four-way reversing valve 2.
  • the first end of the second bypass pipeline is connected to the pipeline between the indoor electronic expansion valve 61 and the high-pressure accumulator 53, the second end of the first bypass pipeline and the second end of the second bypass pipeline Both ends are connected to the pipeline between the first valve 71 and the first outdoor electronic expansion valve 62.
  • a second valve 72 and a third valve 73 are respectively provided on the first bypass pipeline and the second bypass pipeline.
  • the pipeline between the indoor electronic expansion valve 61 and the high-pressure accumulator 53 is connected in series with a subcooler 52, which is divided into a subcooling pipe, which passes through the subcooler 52 and is connected to the gas-liquid separator 54
  • a subcooling electronic expansion valve 64 and a fourth valve 74 are respectively provided at the upstream and downstream positions of the subcooler 52.
  • the air conditioning system also includes a controller, a first temperature sensor and a first humidity sensor arranged between the first outdoor heat exchanger and the outdoor fan, and a first outdoor heat exchanger and a second outdoor The second temperature sensor and the second humidity sensor between the heat exchangers.
  • the controller controls the first valve 71 to be in an open state, the second valve 72, the third valve 73 and the fourth valve 74 to be in a closed state, the indoor electronic expansion valve 61 is in a fully open state, and the An outdoor electronic expansion valve 62 and a second outdoor electronic expansion valve 63 play a throttling function.
  • the flow of refrigerant in the circulation loop is: compressor 1 ⁇ oil separator 51 ⁇ four-way reversing valve 2 ⁇ indoor heat exchanger 3 ⁇ indoor electronic expansion valve 61 ⁇ high pressure accumulator 53 ⁇ (first outdoor electronic expansion valve 62 ⁇ The first outdoor heat exchanger 41), (the second outdoor electronic expansion valve 63 ⁇ the second outdoor heat exchanger 42) ⁇ the four-way reversing valve 2 ⁇ the gas-liquid separator 54 ⁇ the compressor 1.
  • the indoor heat exchanger 3 functions as a condenser
  • the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 function as evaporators, thereby heating the room.
  • the airflow sequentially flows through the first outdoor heat exchanger 41, the second outdoor heat exchanger 42, and the outdoor fan.
  • the adsorption layer on the outer surface of the first outdoor heat exchanger 41 absorbs the moisture in the airflow, so that The humidity of the airflow flowing through the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 is reduced, and the dew point temperature of the airflow is lowered, so that the dew point temperature is lower than that of the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42
  • the surface temperature of the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 are prevented from being frosted.
  • the first temperature sensor and the first humidity sensor detect the first temperature and the first humidity in real time
  • the second temperature sensor and the second humidity sensor detect the second temperature and the second humidity in real time, according to the first temperature and the first humidity
  • Calculate the first dew point temperature calculate the second dew point temperature based on the second temperature and the second humidity, calculate the difference between the first dew point temperature and the second dew point temperature, compare the difference with the first threshold (such as 5°C) and The size of the first temperature and the second threshold (0°C).
  • the controller controls the four-way reversing valve 2 to reverse, and the air conditioning system switches to the cooling mode, and the compressor 1
  • the discharged high-temperature gaseous refrigerant enters the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42, and the high-temperature gaseous refrigerant heats the adsorption layer on the outer surface of the first outdoor heat exchanger 41 to regenerate the adsorption layer.
  • the indoor ambient temperature is further obtained. If the indoor ambient temperature is greater than the third threshold (such as 26°C), the controller controls The second valve 72 is opened to conduct the first bypass line, while the first valve 71, the third valve 73 and the fourth valve 74 are in a closed state.
  • the first threshold such as 5°C
  • the second threshold such as 26°C
  • the flow direction of the refrigerant in the circulation loop is: (1) Compressor ⁇ Oil separator 51 ⁇ Four-way reversing valve 2 ⁇ Indoor heat exchanger 3 ⁇ Indoor electronic expansion valve 61 ⁇ High pressure accumulator 53 ⁇ Second outdoor electronic expansion valve 63 ⁇ Second outdoor heat exchanger 42 ⁇ Four-way reversing Valve 2 ⁇ gas-liquid separator 54 ⁇ compressor 1; (2) compressor ⁇ oil separator 51 ⁇ second valve 72 ⁇ first outdoor electronic expansion valve 62 ⁇ first outdoor heat exchanger 41 ⁇ four-way reversing valve 2 ⁇ Gas-liquid separator 54 ⁇ Compressor 1.
  • the heating function of the indoor heat exchanger 3 is ensured, and part of the high-temperature gaseous refrigerant is passed into the first outdoor heat exchanger 41 through the first bypass pipe to adsorb the surface of the first outdoor heat exchanger 41
  • the layer is heated to evaporate the water absorbed by the adsorption layer, and the regeneration of the adsorption layer is realized.
  • the controller controls the third valve 73 to open
  • the second bypass pipeline is turned on, and the first valve 71, the second valve 72 and the fourth valve 74 are in a closed state.
  • the flow of refrigerant in the circulation loop is: (1) compressor ⁇ oil separator 51 ⁇ Four-way reversing valve 2 ⁇ Indoor heat exchanger 3 ⁇ Indoor electronic expansion valve 61 ⁇ High pressure accumulator 53 ⁇ Second outdoor electronic expansion valve 63 ⁇ Second outdoor heat exchanger 42 ⁇ Four-way reversing valve 2 ⁇ Gas-liquid Separator 54 ⁇ Compressor 1; (2) Compressor ⁇ Oil separator 51 ⁇ Four-way reversing valve 2 ⁇ Indoor heat exchanger 3 ⁇ Indoor electronic expansion valve 61 ⁇ Third valve 73 ⁇ First outdoor electronic expansion valve 62 ⁇ First outdoor heat exchanger 41 ⁇ Four-way reversing valve 2 ⁇ Gas-liquid separator 54 ⁇ Compressor 1.
  • the heating function of the indoor heat exchanger 3 is ensured, and part of the high-temperature liquid refrigerant is passed into the first outdoor heat exchanger 41 through the second bypass pipe to adsorb the surface of the first outdoor heat exchanger 41
  • the layer is heated to evaporate the water absorbed by the adsorption layer, and the regeneration of the adsorption layer is realized.
  • the number of indoor heat exchangers 3 is not limited to 4.
  • the number of indoor heat exchangers 3 may be 2, 3, 5, etc.
  • the number of the first outdoor heat exchanger 41 may be multiple, and the number of the second outdoor heat exchanger 42 may also be multiple.
  • the subcooler 52, the subcooling electronic expansion valve 64, the fourth valve 74, etc. may not be provided in the air conditioning system.

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Abstract

The present invention relates to the technical field of air conditioners and provides an air conditioning system and a control method therefor, for use in solving the problem that an air conditioner having a defrosting function cannot completely eliminate a frost layer, causing that the heating capacity of the air conditioner is influenced. An outdoor heat exchanger of the air conditioning system comprises a first outdoor heat exchanger and a second outdoor heat exchanger sequentially distributed in an airflow direction of an outdoor fan; and an absorption layer is provided on an outer surface of the first outdoor heat exchanger. The air conditioning system comprises a first bypass pipeline and a second bypass pipeline capable of introducing a high-temperature gas-state refrigerant or a high-temperature liquid-state refrigerant into the first outdoor heat exchanger in a heating mode. The control method comprises: obtaining, in the heating mode, a first temperature and a first humidity of an airflow before flowing through the first outdoor heat exchanger and a second temperature and a second humidity of the airflow after flowing through the first outdoor heat exchanger; and selectively switching conducting states of the first bypass pipeline and the second bypass pipeline and operation modes of the air conditioning system according to the first temperature, the second temperature, the first humidity, and the second humidity.

Description

空调***及其控制方法Air conditioning system and its control method 技术领域Technical field
本发明涉及空调技术领域，具体提供了一种空调***及其控制方法。The invention relates to the technical field of air conditioning, and specifically provides an air conditioning system and a control method thereof.
背景技术Background technique
随着人们生活水平的不断提高，空调器在人们的生活中被广泛使用。空调器通过改变循环回路中冷媒的流向，实现了制冷模式与制热模式的切换，从而满足夏季的制冷需求以及冬季的制热需求。不过，在冬季热泵空调***处于制热模式的情况下，室外换热器的外表面经常会结霜，室外换热器的换热性能下降，导致空调***的制热能力严重下降，从而影响空调***的正常制热。With the continuous improvement of people's living standards, air conditioners are widely used in people's lives. The air conditioner realizes the switching between the cooling mode and the heating mode by changing the flow direction of the refrigerant in the circulation loop, so as to meet the cooling demand in summer and heating demand in winter. However, when the heat pump air conditioning system is in heating mode in winter, the outer surface of the outdoor heat exchanger is often frosted, and the heat exchange performance of the outdoor heat exchanger is reduced, resulting in a serious decrease in the heating capacity of the air conditioning system, which affects the air conditioning. Normal heating of the system.
鉴于此，改进后的空调器具有了除霜功能。如在制热模式下，当室外换热器的外表面结霜达到一定程度时，改变循环回路中冷媒的流向，使压缩机排出的高温气态冷媒流入室外换热器，从而将室外换热器外表面的霜融化，在一定程度上减小了霜层对空调器的制热能力的影响。不过，具有除霜功能的空调器仅仅是在室外换热器的表面结霜之后进行除霜来减小霜层对空调器的制热能力的影响，但并未消除霜层对空调器的制热能力的影响。In view of this, the improved air conditioner has a defrosting function. For example, in the heating mode, when the outer surface of the outdoor heat exchanger is frosted to a certain degree, the flow direction of the refrigerant in the circulation loop is changed, so that the high-temperature gaseous refrigerant discharged from the compressor flows into the outdoor heat exchanger, thereby reducing the outdoor heat exchanger The melting of the frost on the outer surface reduces the influence of the frost layer on the heating capacity of the air conditioner to a certain extent. However, the air conditioner with defrosting function only defrosts after the surface of the outdoor heat exchanger is frosted to reduce the influence of the frost layer on the heating capacity of the air conditioner, but it does not eliminate the effect of the frost layer on the air conditioner. The influence of thermal capacity.
相应地，本领域需要一种新的技术方案来解决上述问题。Correspondingly, a new technical solution is needed in this field to solve the above-mentioned problems.
发明内容Summary of the invention
为了解决现有技术中的上述问题，即为了解决具有除霜功能的空调器不能完全消除霜层影响空调器制热能力的问题，本发明一方面提供了一种空调***的控制方法，所述空调***包括压缩机、四通换向阀、室内换热器以及室外换热器，所述压缩机、所述四通换向阀、所述室内换热器以及所述室外换热器连通形成循环回路，所述室外换热器包括沿室外风机的气流方向依次分布的第一室外换热器和第二室外换热器，所述第一室外换热器的外表面设置有吸附层，所述空调***还包括第一旁 通管路和第二旁通管路，在制热模式下，所述压缩机排出的部分冷媒能够通过所述第一旁通管路通入所述第一室外换热器或者所述室内换热器流出的部分冷媒能够通过所述第二旁通管路通入所述第一室外换热器，所述控制方法包括以下步骤：在制热模式下获取气流流经所述第一室外换热器之前的第一温度和第一湿度以及气流流经所述第一室外换热器之后的第二温度和第二湿度；根据所述第一温度、所述第二温度、所述第一湿度以及所述第二湿度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及所述空调***的运行模式。In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that an air conditioner with a defrosting function cannot completely eliminate the frost layer that affects the heating capacity of the air conditioner, one aspect of the present invention provides a control method of an air conditioning system. The air conditioning system includes a compressor, a four-way reversing valve, an indoor heat exchanger, and an outdoor heat exchanger. The compressor, the four-way reversing valve, the indoor heat exchanger, and the outdoor heat exchanger are connected to form Circulation loop, the outdoor heat exchanger includes a first outdoor heat exchanger and a second outdoor heat exchanger sequentially distributed along the airflow direction of the outdoor fan, the outer surface of the first outdoor heat exchanger is provided with an adsorption layer, so The air conditioning system further includes a first bypass pipeline and a second bypass pipeline. In the heating mode, part of the refrigerant discharged from the compressor can pass into the first outdoor room through the first bypass pipeline. The heat exchanger or part of the refrigerant flowing out of the indoor heat exchanger can be passed into the first outdoor heat exchanger through the second bypass line, and the control method includes the following steps: obtaining air flow in a heating mode The first temperature and the first humidity before flowing through the first outdoor heat exchanger and the second temperature and the second humidity after the airflow passes through the first outdoor heat exchanger; according to the first temperature, the The second temperature, the first humidity, and the second humidity selectively switch the conduction state of the first bypass line, the conduction state of the second bypass line, and the air conditioning system Operating mode.
在上述控制方法的优选技术方案中，“根据所述第一温度、所述第二温度、所述第一湿度以及所述第二湿度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：根据所述第一温度和所述第一湿度获得第一露点温度；根据所述第二温度和所述第二湿度获得第二露点温度；计算所述第一露点温度和所述第二露点温度的差值；比较所述差值与第一阈值的大小，根据比较结果和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式。In the preferred technical solution of the above control method, "selectively switch the conduction of the first bypass line according to the first temperature, the second temperature, the first humidity, and the second humidity The steps of “state, the conduction state of the second bypass line, and the operation mode of the air-conditioning system” include: obtaining a first dew point temperature according to the first temperature and the first humidity; and obtaining a first dew point temperature according to the second temperature and The second humidity obtains a second dew point temperature; calculates the difference between the first dew point temperature and the second dew point temperature; compares the difference value with the first threshold value, and compares the result with the first temperature The conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air conditioning system are selectively switched.
在上述控制方法的优选技术方案中，“根据比较结果和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：若所述差值小于所述第一阈值并且所述第一温度大于第二阈值，则使所述第一旁通管路或者所述第二旁通管路处于导通状态。In the preferred technical solution of the above control method, “the conduction state of the first bypass line, the conduction state of the second bypass line, and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature. The step of "operation mode of the air conditioning system" includes: if the difference is less than the first threshold and the first temperature is greater than the second threshold, making the first bypass pipe or the second bypass pipe The road is in a conducting state.
在上述控制方法的优选技术方案中，“根据比较结果和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：若所述差值小于所述第一阈值并且所述第一温度不大于所述第二阈值，则使所述第一旁通管路和所述第二旁通管路均处于断开状态以及使空调***切换为制冷模式。In the preferred technical solution of the above control method, “the conduction state of the first bypass line, the conduction state of the second bypass line, and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature. The operation mode of the air-conditioning system" includes: if the difference is less than the first threshold and the first temperature is not greater than the second threshold, making the first bypass line and the second The bypass lines are all in a disconnected state and the air conditioning system is switched to the cooling mode.
在上述控制方法的优选技术方案中，“根据比较结果和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：若所述差值不小于 所述第一阈值，则使所述第一旁通管路和所述第二旁通管路均处于断开状态。In the preferred technical solution of the above control method, “the conduction state of the first bypass line, the conduction state of the second bypass line, and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature. The step of "operation mode of the air-conditioning system" includes: if the difference is not less than the first threshold, both the first bypass pipeline and the second bypass pipeline are in a disconnected state.
在上述控制方法的优选技术方案中，“使所述第一旁通管路或者所述第二旁通管路处于导通状态”的步骤之前还包括：获取室内环境温度；“使所述第一旁通管路或者所述第二旁通管路处于导通状态”的步骤包括：若所述室内环境温度大于第三阈值，则使所述第一旁通管路处于导通状态。In the preferred technical solution of the above-mentioned control method, before the step of "making the first bypass pipeline or the second bypass pipeline in a conducting state", the method further includes: acquiring the indoor ambient temperature; The step of "a bypass pipeline or the second bypass pipeline is in a conductive state" includes: if the indoor ambient temperature is greater than a third threshold, the first bypass pipeline is in a conductive state.
在上述控制方法的优选技术方案中，“使所述第一旁通管路或者所述第二旁通管路处于导通状态”的步骤包括：若所述室内环境温度不大于所述第三阈值，则使所述第二旁通管路处于导通状态。In the preferred technical solution of the above control method, the step of "making the first bypass pipe or the second bypass pipe in a conducting state" includes: if the indoor ambient temperature is not greater than the third Threshold, the second bypass line is in a conducting state.
在上述控制方法的优选技术方案中，所述控制方法包括：在所述第一旁通管路导通第一设定时长后使所述第一旁通管路断开；或者在所述第二旁通管路导通第二设定时长后使所述第二旁通管路断开；其中，所述第一设定时长小于所述第二设定时长。In the preferred technical solution of the above control method, the control method includes: disconnecting the first bypass pipeline after the first bypass pipeline is conducted for a first set time; or After the two bypass pipelines are conducted for a second set time period, the second bypass pipeline is disconnected; wherein, the first set time period is less than the second set time period.
在上述控制方法的优选技术方案中，所述第一设定时长和/或所述第二设定时长根据所述室外环境温度确定。In the preferred technical solution of the above control method, the first set duration and/or the second set duration are determined according to the outdoor ambient temperature.
本领域技术人员能够理解的是，在本发明的技术方案中，空调***包括压缩机、四通换向阀、室内换热器以及室外换热器，压缩机、四通换向阀、室内换热器以及室外换热器连通形成循环回路，室外换热器包括沿室外风机的气流方向依次分布的第一室外换热器和第二室外换热器，第一室外换热器的外表面设置有吸附层，空调***还包括第一旁通管路和第二旁通管路，在制热模式下压缩机排出的部分冷媒能够通过第一旁通管路通入第一室外换热器或者室内换热器流出的部分冷媒能够通过第二旁通管路通入第一室外换热器，控制方法包括以下步骤：在制热模式下获取气流流经所述第一室外换热器之前的第一温度和第一湿度以及气流流经所述第一室外换热器之后的第二温度和第二湿度；根据所述第一温度、所述第二温度、所述第一湿度以及所述第二湿度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式。Those skilled in the art can understand that in the technical solution of the present invention, the air conditioning system includes a compressor, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger, a compressor, a four-way reversing valve, and an indoor heat exchanger. The heat exchanger and the outdoor heat exchanger are connected to form a circulation loop. The outdoor heat exchanger includes a first outdoor heat exchanger and a second outdoor heat exchanger that are sequentially distributed along the airflow direction of the outdoor fan. The outer surface of the first outdoor heat exchanger is arranged With an adsorption layer, the air conditioning system also includes a first bypass pipeline and a second bypass pipeline. In heating mode, part of the refrigerant discharged from the compressor can pass into the first outdoor heat exchanger through the first bypass pipeline or Part of the refrigerant flowing out of the indoor heat exchanger can be passed into the first outdoor heat exchanger through the second bypass line, and the control method includes the following steps: in the heating mode, obtaining airflow before flowing through the first outdoor heat exchanger The first temperature and the first humidity, and the second temperature and the second humidity after the air flows through the first outdoor heat exchanger; according to the first temperature, the second temperature, the first humidity, and the The second humidity selectively switches the conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air conditioning system.
在制热模式下，获取气流流经第一室外换热器之前的第一温度和第一湿度以及气流流经第一室外换热器之后的第二温度和第二湿度， 根据第一温度、第二温度、第一湿度以及第二湿度判定是否需要对吸附层加热使其再生。当不需要对吸附层加热使其再生时，第一旁通管路和第二旁通管路处于断开状态，并使空调***保持制热运行模式，第一室外换热器外表面的吸附层吸附流经的气流中的水分，降低了气流的湿度，进而使气流的露点温度降低；当判定需要对吸附层进行加热使其再生时，使空调***切换至制冷模式，或者使第一旁通管路处于导通状态，或者使第二旁通管路处于导通状态，高温冷媒进入第一室外换热器对吸附层进行加热使其再生，从而使吸附层能够在空调***制热过程中不断吸附气流中的水分，使气流的露点温度降低，从而在制热模式下避免了空调***中室外换热器的外表面结霜，完全消除了霜层对空调***制热能力的影响。In the heating mode, the first temperature and the first humidity before the air flow through the first outdoor heat exchanger and the second temperature and the second humidity after the air flow through the first outdoor heat exchanger are acquired, according to the first temperature, The second temperature, the first humidity, and the second humidity determine whether the adsorption layer needs to be heated to regenerate it. When there is no need to heat the adsorption layer to regenerate it, the first bypass pipeline and the second bypass pipeline are in a disconnected state, and the air conditioning system maintains the heating operation mode. The adsorption on the outer surface of the first outdoor heat exchanger The layer adsorbs the moisture in the airflow passing through, which reduces the humidity of the airflow, thereby reducing the dew point temperature of the airflow; when it is determined that the adsorption layer needs to be heated to regenerate it, the air conditioning system is switched to the cooling mode, or the first side The duct is in the conducting state, or the second bypass duct is in the conducting state, the high-temperature refrigerant enters the first outdoor heat exchanger to heat the adsorption layer and regenerate it, so that the adsorption layer can be used in the heating process of the air conditioning system In the heating mode, the moisture in the airflow is continuously absorbed to reduce the dew point temperature of the airflow, thereby avoiding frosting on the outer surface of the outdoor heat exchanger in the air-conditioning system in the heating mode, and completely eliminating the influence of the frost layer on the heating capacity of the air-conditioning system.
另一方面，本发明还提供了一种空调***，该空调***包括控制器，所述控制器用于执行上述任一项的控制方法。需要说明的是，该空调***具有上述空调***的控制方法的全部技术效果。On the other hand, the present invention also provides an air-conditioning system, which includes a controller, and the controller is used to execute any one of the above-mentioned control methods. It should be noted that the air-conditioning system has all the technical effects of the above-mentioned control method of the air-conditioning system.
附图说明Description of the drawings
下面参照附图并结合多联机空调***来描述本发明的优选实施方式，附图中：Hereinafter, the preferred embodiments of the present invention will be described with reference to the accompanying drawings and in conjunction with a multi-line air conditioning system. In the accompanying drawings:
图1是本发明空调***的控制方法的主要步骤示意图；Figure 1 is a schematic diagram of the main steps of the control method of the air conditioning system of the present invention;
图2是本发明空调***的控制方法的具体步骤示意图；2 is a schematic diagram of specific steps of the control method of the air conditioning system of the present invention;
图3是本发明一种实施例的多联机空调***的结构示意图。Fig. 3 is a schematic structural diagram of a multi-connected air-conditioning system according to an embodiment of the present invention.
附图标记列表:List of reference signs:
1、压缩机；2、四通换向阀；3、室内换热器；41、第一室外换热器；42、第二室外换热器；51、油分离器；52、过冷却器；53、高压储液器；54、气液分离器；61、室内电子膨胀阀；62、第一室外电子膨胀阀；63、第二室外电子膨胀阀；64、过冷电子膨胀阀；71、第一阀门；72、第二阀门；73、第三阀门；74、第四阀门。1. Compressor; 2. Four-way reversing valve; 3. Indoor heat exchanger; 41. The first outdoor heat exchanger; 42. The second outdoor heat exchanger; 51. Oil separator; 52. Subcooler; 53. High pressure accumulator; 54, gas-liquid separator; 61, indoor electronic expansion valve; 62, first outdoor electronic expansion valve; 63, second outdoor electronic expansion valve; 64, subcooled electronic expansion valve; 71, first One valve; 72, the second valve; 73, the third valve; 74, the fourth valve.
具体实施方式Detailed ways
下面参照附图来描述本发明的优选实施方式。本领域技术人员应当理解的是，这些实施方式仅仅用于解释本发明的技术原理，并非旨在限制本发明的保护范围。The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.
需要说明的是，在本发明的描述中，术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方向或位置关系的术语是基于附图所示的方向或位置关系，这仅仅是为了便于描述，而不是指示或暗示所述装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”、“第三”、“第四”、“第五”仅用于描述目的，而不能理解为指示或暗示相对重要性。It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and other terms indicating directions or positional relationships are based on the attached drawings. The direction or position relationship shown is only for ease of description, and does not indicate or imply that the device or element must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", "fourth", and "fifth" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.
此外，还需要说明的是，在本发明的描述中，除非另有明确的规定和限定，术语“安装”、“设置”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，还可以是两个元件内部的连通。对于本领域技术人员而言，可根据具体情况理解上述术语在本发明中的具体含义。In addition, it should be noted that, in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it may be a fixed connection or It is a detachable connection or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication between two components. For those skilled in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.
参照图1至图3，图1是本发明空调***的控制方法的主要步骤示意图；图2是本发明空调***的控制方法的具体步骤示意图；图3是本发明一种实施例的多联机空调***的结构示意图。1 to 3, Figure 1 is a schematic diagram of the main steps of the control method of the air conditioning system of the present invention; Figure 2 is a schematic diagram of the specific steps of the control method of the air conditioning system of the present invention; Figure 3 is a multi-connected air conditioner according to an embodiment of the present invention Schematic diagram of the system structure.
空调***包括压缩机、四通换向阀、室内换热器以及室外换热器，压缩机、四通换向阀、室内换热器以及室外换热器连通形成循环回路，室外换热器包括沿室外风机的气流方向依次分布的第一室外换热器和第二室外换热器，第一室外换热器的外表面设置有吸附层，空调***还包括第一旁通管路和第二旁通管路，在制热模式下，压缩机排出的部分冷媒能够通过第一旁通管路通入第一室外换热器或者室内换热器流出的部分冷媒能够通过第二旁通管路通入第一室外换热器。空调***包括控制器，控制器用于空调***的控制方法。The air conditioning system includes a compressor, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger. The compressor, the four-way reversing valve, the indoor heat exchanger and the outdoor heat exchanger are connected to form a circulation loop. The outdoor heat exchanger includes The first outdoor heat exchanger and the second outdoor heat exchanger are sequentially distributed along the airflow direction of the outdoor fan. The outer surface of the first outdoor heat exchanger is provided with an adsorption layer. The air conditioning system also includes a first bypass pipeline and a second Bypass pipeline, in heating mode, part of the refrigerant discharged from the compressor can pass into the first outdoor heat exchanger through the first bypass pipeline or part of the refrigerant flowing out of the indoor heat exchanger can pass through the second bypass pipeline Access the first outdoor heat exchanger. The air-conditioning system includes a controller, and the controller is used in a control method of the air-conditioning system.
如图1所示，空调***的控制方法包括主要包括以下步骤：As shown in Figure 1, the control method of the air conditioning system mainly includes the following steps:
S100、在制热模式下获取气流流经所述第一室外换热器之前的第一温度和第一湿度以及气流流经所述第一室外换热器之后的第二温度和第二湿度。如第一室外换热器外侧设置有第一温度传感器和第一湿 度传感器，第一室外换热器与第二室外换热器之间设置有第二温度传感器和第二湿度传感器。在制热模式下，第一温度传感器和第一湿度传感器分别检测气流流经第一室外换热器之前的第一温度和第一湿度，第二温度传感器和第二湿度传感器分别检测室外气流流经第一室外换热器之后的第二温度和第二湿度。其中，第一湿度和第二湿度均为相对湿度。S100. Acquire a first temperature and a first humidity before the airflow flows through the first outdoor heat exchanger and a second temperature and a second humidity after the airflow flows through the first outdoor heat exchanger in the heating mode. For example, a first temperature sensor and a first humidity sensor are arranged outside the first outdoor heat exchanger, and a second temperature sensor and a second humidity sensor are arranged between the first outdoor heat exchanger and the second outdoor heat exchanger. In the heating mode, the first temperature sensor and the first humidity sensor respectively detect the first temperature and the first humidity before the air flows through the first outdoor heat exchanger, and the second temperature sensor and the second humidity sensor respectively detect the outdoor air flow The second temperature and second humidity after the first outdoor heat exchanger. Wherein, the first humidity and the second humidity are both relative humidity.
S200、根据第一温度、第二温度、第一湿度以及第二湿度选择性地切换第一旁通管路的导通状态、第二旁通管路的导通状态以及空调***的运行模式。S200. Selectively switch the conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air conditioning system according to the first temperature, the second temperature, the first humidity, and the second humidity.
如图2所示，具体而言，步骤S200包括以下步骤：As shown in FIG. 2, specifically, step S200 includes the following steps:
S210、根据第一温度和第一湿度获得第一露点温度；根据第二温度和第二湿度获得第二露点温度；计算第一露点温度和第二露点温度的差值。S210. Obtain a first dew point temperature according to the first temperature and the first humidity; obtain a second dew point temperature according to the second temperature and the second humidity; and calculate a difference between the first dew point temperature and the second dew point temperature.
本领域技术人员可以理解的是，可以采用查表的方式根据第一温度和第一湿度获得第一露点温度以及根据第二温度和第二湿度获得第二露点温度。例如存储器中存储湿度、温度以及露点的对应关系表，控制器根据第一温度和第一湿度从存储器中存储的对应关系表中获取对应的第一露点温度，根据第二温度和第二湿度从存储器中存储的对应关系表中获取对应的第二露点温度。另外，根据第一温度和第一湿度获得第一露点温度以及根据第二温度和第二湿度获得第二露点温度也可以利用公式计算，如露点温度t＝35.957-1.8726LN(Pq)+1.1689LN(Pq)^2，相对湿度RH(％)＝Pq/Pqb，其中，Pq为水蒸气分压力，Pqb为饱和水蒸气分压力，可根据当前的室外环境温度(第一温度)查表获取当前的室外环境温度对应的Pqb值，然后通过上述两个公式计算出对应的露点温度t。Those skilled in the art can understand that the first dew point temperature can be obtained according to the first temperature and the first humidity and the second dew point temperature can be obtained according to the second temperature and the second humidity in a table look-up manner. For example, the memory stores the correspondence table of humidity, temperature and dew point, the controller obtains the corresponding first dew point temperature from the correspondence table stored in the memory according to the first temperature and the first humidity, and obtains the corresponding first dew point temperature according to the second temperature and the second humidity. The corresponding second dew point temperature is obtained from the correspondence table stored in the memory. In addition, obtaining the first dew point temperature according to the first temperature and the first humidity and obtaining the second dew point temperature according to the second temperature and the second humidity can also be calculated using formulas, such as the dew point temperature t=35.957-1.8726LN(Pq)+1.1689LN (Pq)^2, relative humidity RH(%)=Pq/Pqb, where Pq is the partial pressure of water vapor, and Pqb is the partial pressure of saturated water vapor. The current outdoor environment temperature (the first temperature) can be obtained by looking up the table. The Pqb value corresponding to the outdoor ambient temperature, and then the corresponding dew point temperature t is calculated by the above two formulas.
S220、若差值小于第一阈值并且第一温度不大于第二阈值，则使第一旁通管路和第二旁通管路均处于断开状态以及使空调***切换为制冷模式。S220: If the difference is less than the first threshold and the first temperature is not greater than the second threshold, the first bypass pipeline and the second bypass pipeline are both in a disconnected state and the air conditioning system is switched to a cooling mode.
如将第一阈值设置为5℃，第二阈值设置为0℃，当检测到的第一温度为-6℃，计算得到的第一露点温度为-3℃，第二露点温度为-5℃时，则第一露点温度和第二露点温度的差值(2℃)小于第一阈值(5℃)，并且第一温度为-6℃小于第二阈值(0℃)，此时控制四通换向阀换向，空调***切换至制冷模式，压缩机排出的高温气态冷媒进入第一室外换 热器中加热其表面的吸附层而使吸附层再生。需要说明的是，第一阈值为5℃、第二阈值为0℃仅是一种示例性的描述，本领域技术人员可以根据需要对其作出调整，以便适应具体的应用场合，如第一阈值可以是3℃、6℃等，第二阈值可以是-2℃、1℃等。For example, if the first threshold is set to 5°C and the second threshold is set to 0°C, when the detected first temperature is -6°C, the calculated first dew point temperature is -3°C and the second dew point temperature is -5°C When, the difference between the first dew point temperature and the second dew point temperature (2°C) is less than the first threshold (5°C), and the first temperature is -6°C less than the second threshold (0°C), and the four-way control is now controlled. The direction of the reversing valve changes, the air conditioning system switches to the refrigeration mode, and the high-temperature gaseous refrigerant discharged from the compressor enters the first outdoor heat exchanger to heat the adsorption layer on the surface to regenerate the adsorption layer. It should be noted that the first threshold value of 5°C and the second threshold value of 0°C are only an exemplary description, and those skilled in the art can adjust them as needed to adapt to specific applications, such as the first threshold value. It can be 3°C, 6°C, etc., and the second threshold can be -2°C, 1°C, or the like.
S230、若差值小于第一阈值并且第一温度大于第二阈值时，则获取室内环境温度。S230: If the difference is less than the first threshold and the first temperature is greater than the second threshold, acquire the indoor ambient temperature.
S231、若室内环境温度大于第三阈值(如26℃)，则使第一旁通管路处于导通状态。S231: If the indoor ambient temperature is greater than the third threshold (for example, 26°C), the first bypass pipeline is placed in a conducting state.
S232、若室内环境温度不大于第三阈值(如26℃)，则使第二旁通管路处于导通状态。S232. If the indoor ambient temperature is not greater than the third threshold (for example, 26°C), the second bypass pipeline is put in a conducting state.
当差值小于第一阈值时，说明此时吸附层吸附了较多的水分，吸附层的吸水能力下降，此时需要对吸附层进行加热使其吸附的水分蒸发掉从而进一步吸附流经使室外换热器的气流中的水分。当第一温度不大于第二阈值时，说明室外温度较低，此时使四通换向阀换向，空调***切换至制冷模式，使大量的气态冷媒流入第一室外换热器内，从而快速地加热吸附层使其再生。当差值小于第一阈值，同时第一温度大于第二阈值时，说明此时室外温度相对较高，同时吸附层吸附了较多的水分，此时可以使第一旁通管路处于导通状态或者使第二旁通管路处于导通状态，以便对第一室外换热器表面的吸附层加热。当根据室内环境温度大于第三阈值时，此时室内温度相对较高，使第一旁通管路处于导通状态，将压缩机排出的部分气态冷媒通入第一室外换热器，这样虽然进入室内换热器的气态冷媒减少了，但室内环境温度不会达到较低的温度。当根据室内环境温度不大于第三阈值时，使第二旁通管路处于导通状态，将室内换热器流出的部分液态冷媒通入第一室外换热器，这样既保证了进入室内换热器的气态冷媒的量，保证了对室内的加热效率，又实现了对吸附层的加热再生。通过这样的控制方式，避免了室内环境温度过低，保证了室内的舒适度。可以理解的是，第三阈值不局限于26℃，本领域技术人员可以根据具体情况进行设置，如第三阈值可以是22℃、24℃、25℃等。When the difference is less than the first threshold, it means that the adsorption layer has adsorbed more water at this time, and the water absorption capacity of the adsorption layer has decreased. At this time, the adsorption layer needs to be heated to evaporate the adsorbed water so as to further adsorb and flow through the outdoor. Moisture in the airflow of the heat exchanger. When the first temperature is not greater than the second threshold, it means that the outdoor temperature is low. At this time, the four-way reversing valve is switched, and the air conditioning system is switched to the cooling mode, so that a large amount of gaseous refrigerant flows into the first outdoor heat exchanger. The adsorption layer is quickly heated to regenerate it. When the difference is less than the first threshold and the first temperature is greater than the second threshold, it means that the outdoor temperature is relatively high at this time and the adsorption layer adsorbs more water. At this time, the first bypass pipeline can be turned on. Or make the second bypass pipe in a conducting state, so as to heat the adsorption layer on the surface of the first outdoor heat exchanger. When the indoor ambient temperature is greater than the third threshold, the indoor temperature is relatively high at this time, so that the first bypass pipeline is in a conducting state, and part of the gaseous refrigerant discharged from the compressor is passed into the first outdoor heat exchanger. The gaseous refrigerant entering the indoor heat exchanger is reduced, but the indoor ambient temperature will not reach a lower temperature. When the indoor environment temperature is not greater than the third threshold, the second bypass pipeline is in a conducting state, and part of the liquid refrigerant flowing out of the indoor heat exchanger is passed into the first outdoor heat exchanger, which ensures that it enters the indoor heat exchanger. The amount of gaseous refrigerant in the heater ensures the heating efficiency of the room and realizes the heating and regeneration of the adsorption layer. Through this control method, the indoor environment temperature is avoided to be too low, and the indoor comfort is ensured. It is understandable that the third threshold is not limited to 26°C, and those skilled in the art can set it according to specific conditions. For example, the third threshold may be 22°C, 24°C, 25°C, and so on.
S240、若差值不小于第一阈值，则使第一旁通管路和第二旁通管路均处于断开状态。S240: If the difference is not less than the first threshold, both the first bypass pipeline and the second bypass pipeline are in a disconnected state.
当差值不小于第一阈值时，说明此时吸附层具有较强的吸水能力，使第一旁通管路和第二旁通管路保持断开状态，空调***处于正常的制热状态，吸附层吸附流经第一室外换热器的气流中的水分，使气流的湿度降低，进而降低其露点温度，避免第一室外换热器和第二室外换热器表面结霜。When the difference is not less than the first threshold, it indicates that the adsorption layer has strong water absorption capacity at this time, so that the first bypass pipeline and the second bypass pipeline remain disconnected, and the air conditioning system is in a normal heating state. The adsorption layer adsorbs the moisture in the airflow flowing through the first outdoor heat exchanger, so that the humidity of the airflow is reduced, thereby reducing its dew point temperature, and avoiding frosting on the surfaces of the first outdoor heat exchanger and the second outdoor heat exchanger.
本领域技术人员可以理解的是，若差值小于第一阈值并且第一温度大于第二阈值时，可以不获取室内环境温度，直接使第一旁通管路和第二旁通管路中的一条处于导通状态，如当差值小于第一阈值并且第一温度大于第二阈值时，使第一旁通管路和第二旁通管路交替导通，如使第一旁通管路导通2min后断开，然后使第二旁通管路导通1min，之后第二旁通管路断开，使第一旁通管路导通2min，如此交替导通。这样，同样能够避免室内温度过低，同时相对于仅导通第二旁通管路的方式，提高了吸附层的再生效率。此外，根据第一温度和第一湿度获得第一露点温度，根据第二温度和第二湿度获得第二露点温度，计算第一露点温度和第二露点温度的差值，根据差值和第一温度判断是否选择性地切换第一旁通管路的导通状态、第二旁通管路的导通状态以及空调***的运行模式仅是一种优选的实施方式，本领域技术人员可以根据第一温度和第一湿度计算出对应的第一绝对湿度，根据第一温度和第二湿度计算出对应的第二绝对湿度，并计算第一绝对湿度和第二绝对湿度的差值，根据第一绝对湿度和第二绝对湿度的差值和第一温度确定是否选择性地切换第一旁通管路的导通状态、第二旁通管路的导通状态以及空调***的运行模式。只不过绝对湿度的数值较小，判断时误差相对较大而已。Those skilled in the art can understand that if the difference is less than the first threshold and the first temperature is greater than the second threshold, the indoor ambient temperature may not be acquired, and the One is in the conducting state, such as when the difference is less than the first threshold and the first temperature is greater than the second threshold, the first bypass pipeline and the second bypass pipeline are alternately conducted, such as the first bypass pipeline After being turned on for 2 minutes, it will be disconnected, and then the second bypass line will be turned on for 1 min, after which the second bypass line will be disconnected, and the first bypass line will be turned on for 2 minutes, and the conduction will be performed alternately. In this way, too low indoor temperature can be avoided, and at the same time, the regeneration efficiency of the adsorption layer is improved compared to the mode that only conducts the second bypass pipe. In addition, the first dew point temperature is obtained according to the first temperature and the first humidity, the second dew point temperature is obtained according to the second temperature and the second humidity, and the difference between the first dew point temperature and the second dew point temperature is calculated. The temperature judgment whether to selectively switch the conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air-conditioning system is only a preferred embodiment. Calculate the corresponding first absolute humidity according to the first temperature and the first humidity, calculate the corresponding second absolute humidity according to the first temperature and the second humidity, and calculate the difference between the first absolute humidity and the second absolute humidity, according to the first The difference between the absolute humidity and the second absolute humidity and the first temperature determine whether to selectively switch the conduction state of the first bypass line, the conduction state of the second bypass line, and the operation mode of the air conditioning system. It's just that the absolute humidity value is small, and the error in judgment is relatively large.
在步骤S231之后，控制方法还包括步骤S251、在第一旁通管路导通第一设定时长后使第一旁通管路断开。After step S231, the control method further includes step S251, disconnecting the first bypass line after the first bypass line is turned on for a first set period of time.
在步骤S232之后，控制方法还包括步骤S252、在第二旁通管路导通第二设定时长后使第二旁通管路断开。其中，第一设定时长小于第二设定时长。After step S232, the control method further includes step S252, disconnecting the second bypass line after the second bypass line is turned on for a second set period of time. Wherein, the first set duration is less than the second set duration.
如第一设定时长为20min，第二设定时长为30min。第一旁通管路处于导通状态时，将部分高温气态的冷媒通入第一室外换热器中，对吸附层加热的效率相对较高；第二旁通管路处于导通状态时，将部分高温液态的冷媒通入第一室外换热器中，对吸附层加热的效率相对较低。 因此，将第一设定时长小于第二设定时长，在保证吸附层完全再生的基础上，避免了吸附层加热时间过长，较小了对吸附层加热的操作对空调***制热能力的影响。For example, the first set duration is 20min, and the second set duration is 30min. When the first bypass pipeline is in the conducting state, part of the high-temperature gaseous refrigerant is passed into the first outdoor heat exchanger, and the efficiency of heating the adsorption layer is relatively high; when the second bypass pipeline is in the conducting state, Passing part of the high-temperature liquid refrigerant into the first outdoor heat exchanger has relatively low heating efficiency for the adsorption layer. Therefore, the first set time period is smaller than the second set time period. On the basis of ensuring the complete regeneration of the adsorption layer, excessive heating time of the adsorption layer is avoided, and the operation of heating the adsorption layer has less effect on the heating capacity of the air conditioning system. influences.
本领域技术人员可以理解的是，第一设定时长为20min，第二设定时长为30min仅是一种示例性的描述，本领域技术人员可以根据实际情况对第一设定时长和第二设定时长进行调整，以便适应具体的应用场合，如第一设定时长可以是15min，18min，22min等，第二设定时长可以是23min、25min、28min等。Those skilled in the art can understand that the first set duration of 20 minutes and the second set duration of 30 minutes are only an exemplary description. Those skilled in the art can make adjustments to the first set duration and the second set duration according to actual conditions. Adjust the set duration to suit specific applications. For example, the first set duration can be 15min, 18min, 22min, etc., and the second set duration can be 23min, 25min, 28min, etc.
优选地，第一设定时长和第二设定时长可以根据第一温度确定。示例性地，当第一温度大于6℃时，第一设定时长为16min，第二设定时长为24min；当第一温度大于-2℃并且不大于6℃时，第一设定时长为18min，第二设定时长为27min；当第一温度不大于-2℃时，第一设定时长为22min，第二设定时长为35min。由于第一温度越低，即室外环境温度越低，第一旁通管路或者第二旁通管路导通通过高温冷媒对吸附层加热时，散发到室外环境中的热量越多，用来加热吸附层使其吸附的水分蒸发的热量相对减少。在第一温度较低的情况下，使第一设定时长和第二设定时长增大，能够保证吸附层的再生。可以理解的是，第一温度所处的温度区间、对应的第一设定时长以及对应的第二时长可以根据具体情况进行设定。Preferably, the first set duration and the second set duration can be determined according to the first temperature. Exemplarily, when the first temperature is greater than 6°C, the first set duration is 16min, and the second set duration is 24min; when the first temperature is greater than -2°C and not greater than 6°C, the first set duration is 18min, the second setting duration is 27min; when the first temperature is not greater than -2℃, the first setting duration is 22min, and the second setting duration is 35min. Since the first temperature is lower, that is, the outdoor environment temperature is lower, when the first bypass pipeline or the second bypass pipeline is conducted to heat the adsorption layer through the high-temperature refrigerant, the more heat is dissipated to the outdoor environment. Heating the adsorption layer causes the amount of heat to evaporate the adsorbed water is relatively reduced. When the first temperature is relatively low, increasing the first set time period and the second set time period can ensure the regeneration of the adsorption layer. It can be understood that the temperature interval in which the first temperature is located, the corresponding first set duration, and the corresponding second duration can be set according to specific conditions.
本发明另一方面提供了一种空调***，空调***包括控制器，控制器用于执行上述任一项的控制方法。Another aspect of the present invention provides an air-conditioning system. The air-conditioning system includes a controller, and the controller is used to execute any one of the above-mentioned control methods.
如图3所示，在一种具体的实施例中，多联机空调***包括压缩机1、四通换向阀2、4个室内换热器3、第一室外换热器41以及第二室外换热器42。压缩机1、四通换向阀2、4个室内换热器3、第一室外换热器41以及第二室外换热器42连通形成循环回路。第一室外换热器41和第二室外换热器42沿室外风机(图中未示出)的气流方向依次分布，第一室外换热器41的外表面设置有吸附层(图中未示出)，如硅胶涂层。可以理解的是，吸附层也可以是碳酸钾涂层或者其他合适的可再生的吸附剂涂层等。As shown in Figure 3, in a specific embodiment, the multi-line air conditioning system includes a compressor 1, a four-way reversing valve 2, 4 indoor heat exchangers 3, a first outdoor heat exchanger 41, and a second outdoor heat exchanger. Heat exchanger 42. The compressor 1, the four-way reversing valve 2, the four indoor heat exchangers 3, the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 are connected to form a circulation loop. The first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 are sequentially distributed along the airflow direction of the outdoor fan (not shown in the figure), and the outer surface of the first outdoor heat exchanger 41 is provided with an adsorption layer (not shown in the figure) Out), such as silicone coating. It is understandable that the adsorption layer can also be a potassium carbonate coating or other suitable renewable adsorbent coatings.
具体而言，压缩机1的排气口与四通换向阀2的第一接口通过管路连接，在压缩机1的排气口与四通换向阀2的第一接口之间设置有油分 离器51，油分离器51的回油口连接至压缩机1的吸气口。四个室内换热器3的第一端均连接至四通换向阀2的第二接口，每个室内换热器3的第二端连接至室内电子膨胀阀61，室内电子膨胀阀61连接至高压储液器53，高压储液器53通过两条支路分别连接至第一室外换热器41的第一端和第二室外换热器42的第一端，高压储液器53与第一室外换热器41之间的支路上设置有第一阀门71，第一阀门71和第一室外换热器41之间设置有第一室外电子膨胀阀62，高压储液器53与第二室外换热器42之间的支路上设置有第二室外电子膨胀阀63，第一室外换热器41的第二端和第二室外换热器42的第二端均连接至四通换向阀2的第三接口，四通换向阀2的第四接口连接至气液分离器54，气液分离器54连接至压缩机1的吸气口。Specifically, the exhaust port of the compressor 1 and the first port of the four-way reversing valve 2 are connected by a pipeline, and a first port is provided between the exhaust port of the compressor 1 and the first port of the four-way reversing valve 2 The oil separator 51 and the oil return port of the oil separator 51 are connected to the suction port of the compressor 1. The first ends of the four indoor heat exchangers 3 are all connected to the second port of the four-way reversing valve 2, the second end of each indoor heat exchanger 3 is connected to the indoor electronic expansion valve 61, and the indoor electronic expansion valve 61 is connected To the high-pressure accumulator 53, the high-pressure accumulator 53 is respectively connected to the first end of the first outdoor heat exchanger 41 and the first end of the second outdoor heat exchanger 42 through two branches, the high-pressure accumulator 53 and A first valve 71 is provided on the branch between the first outdoor heat exchanger 41, a first outdoor electronic expansion valve 62 is provided between the first valve 71 and the first outdoor heat exchanger 41, and the high-pressure accumulator 53 is connected to the first outdoor heat exchanger 41. A second outdoor electronic expansion valve 63 is provided on the branch between the two outdoor heat exchangers 42, and the second end of the first outdoor heat exchanger 41 and the second end of the second outdoor heat exchanger 42 are both connected to the four-way exchange The third port of the valve 2 and the fourth port of the four-way reversing valve 2 are connected to the gas-liquid separator 54, and the gas-liquid separator 54 is connected to the suction port of the compressor 1.
空调***中还包括第一旁通管路和第二旁通管路，第一旁通管路的第一端连接至油分离器51与四通换向阀2的第一接口之间的管路，第二旁通管路的第一端连接至室内电子膨胀阀61与高压储液器53之间的管路，第一旁通管路的第二端和第二旁通管路的第二端均连接至第一阀门71与第一室外电子膨胀阀62之间的管路。第一旁通管路和第二旁通管路上分别设置有第二阀门72和第三阀门73。The air conditioning system also includes a first bypass pipeline and a second bypass pipeline. The first end of the first bypass pipeline is connected to the pipe between the oil separator 51 and the first interface of the four-way reversing valve 2. The first end of the second bypass pipeline is connected to the pipeline between the indoor electronic expansion valve 61 and the high-pressure accumulator 53, the second end of the first bypass pipeline and the second end of the second bypass pipeline Both ends are connected to the pipeline between the first valve 71 and the first outdoor electronic expansion valve 62. A second valve 72 and a third valve 73 are respectively provided on the first bypass pipeline and the second bypass pipeline.
室内电子膨胀阀61与高压储液器53之间的管路串联有过冷却器52，该管路分出一条过冷管，过冷管穿过过冷却器52并连接至气液分离器54的进口，过冷管上在过冷却器52的上下游位置分别设置有过冷电子膨胀阀64和第四阀门74。The pipeline between the indoor electronic expansion valve 61 and the high-pressure accumulator 53 is connected in series with a subcooler 52, which is divided into a subcooling pipe, which passes through the subcooler 52 and is connected to the gas-liquid separator 54 At the inlet of the subcooling pipe, a subcooling electronic expansion valve 64 and a fourth valve 74 are respectively provided at the upstream and downstream positions of the subcooler 52.
虽然图中未示出，空调***还包括控制器、设置在第一室外换热器与室外风机之间的第一温度传感器和第一湿度传感器以及设置在第一室外换热器与第二室外换热器之间的第二温度传感器和第二湿度传感器。Although not shown in the figure, the air conditioning system also includes a controller, a first temperature sensor and a first humidity sensor arranged between the first outdoor heat exchanger and the outdoor fan, and a first outdoor heat exchanger and a second outdoor The second temperature sensor and the second humidity sensor between the heat exchangers.
在空调***处于常规制热模式下，控制器控制第一阀门71处于打开状态，第二阀门72、第三阀门73和第四阀门74处于关闭状态，室内电子膨胀阀61处于全开状态，第一室外电子膨胀阀62和第二室外电子膨胀阀63起节流作用。循环回路中冷媒的流向为：压缩机1→油分离器51→四通换向阀2→室内换热器3→室内电子膨胀阀61→高压储液器53→(第一室外电子膨胀阀62→第一室外换热器41)、(第二室外电子膨胀阀63→第二室外换热器42)→四通换向阀2→气液分离器54→压缩机1。在这 个过程中，室内换热器3起冷凝器的作用，第一室外换热器41和第二室外换热器42起蒸发器的作用，从而对室内进行制热。在室外风机的作用下，气流依次流经第一室外换热器41、第二室外换热器42和室外风机，第一室外换热器41外表面上的吸附层吸附气流中的水分，使流经第一室外换热器41和第二室外换热器42的气流的湿度降低，降低了气流的露点温度，使露点温度低于第一室外换热器41和第二室外换热器42的表面温度，从而避免了第一室外换热器41和第二室外换热器42表面结霜。When the air conditioning system is in the conventional heating mode, the controller controls the first valve 71 to be in an open state, the second valve 72, the third valve 73 and the fourth valve 74 to be in a closed state, the indoor electronic expansion valve 61 is in a fully open state, and the An outdoor electronic expansion valve 62 and a second outdoor electronic expansion valve 63 play a throttling function. The flow of refrigerant in the circulation loop is: compressor 1→oil separator 51→four-way reversing valve 2→indoor heat exchanger 3→indoor electronic expansion valve 61→high pressure accumulator 53→(first outdoor electronic expansion valve 62 → The first outdoor heat exchanger 41), (the second outdoor electronic expansion valve 63 → the second outdoor heat exchanger 42) → the four-way reversing valve 2 → the gas-liquid separator 54 → the compressor 1. In this process, the indoor heat exchanger 3 functions as a condenser, and the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 function as evaporators, thereby heating the room. Under the action of the outdoor fan, the airflow sequentially flows through the first outdoor heat exchanger 41, the second outdoor heat exchanger 42, and the outdoor fan. The adsorption layer on the outer surface of the first outdoor heat exchanger 41 absorbs the moisture in the airflow, so that The humidity of the airflow flowing through the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 is reduced, and the dew point temperature of the airflow is lowered, so that the dew point temperature is lower than that of the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 The surface temperature of the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42 are prevented from being frosted.
与此同时，第一温度传感器和第一湿度传感器实时检测第一温度和第一湿度，第二温度传感器和第二湿度传感器实时检测第二温度和第二湿度，根据第一温度和第一湿度计算第一露点温度，根据第二温度和第二湿度计算第二露点温度，并计算第一露点温度和第二露点温度的差值，比较差值与第一阈值(如5℃)的大小以及第一温度与第二阈值(0℃)的大小。At the same time, the first temperature sensor and the first humidity sensor detect the first temperature and the first humidity in real time, the second temperature sensor and the second humidity sensor detect the second temperature and the second humidity in real time, according to the first temperature and the first humidity Calculate the first dew point temperature, calculate the second dew point temperature based on the second temperature and the second humidity, calculate the difference between the first dew point temperature and the second dew point temperature, compare the difference with the first threshold (such as 5°C) and The size of the first temperature and the second threshold (0°C).
当差值小于第一阈值(如5℃)，并且第一温度不大于第二阈值(0℃)时，控制器控制四通换向阀2换向，空调***切换至制冷模式，压缩机1排出的高温气态冷媒进入第一室外换热器41和第二室外换热器42，高温气态冷媒对第一室外换热器41外表面的吸附层加热，使吸附层再生。When the difference is less than the first threshold (for example, 5°C) and the first temperature is not greater than the second threshold (0°C), the controller controls the four-way reversing valve 2 to reverse, and the air conditioning system switches to the cooling mode, and the compressor 1 The discharged high-temperature gaseous refrigerant enters the first outdoor heat exchanger 41 and the second outdoor heat exchanger 42, and the high-temperature gaseous refrigerant heats the adsorption layer on the outer surface of the first outdoor heat exchanger 41 to regenerate the adsorption layer.
当差值小于第一阈值(如5℃)，并且第一温度大于第二阈值(0℃)时，进一步获取室内环境温度，若室内环境温度大于第三阈值(如26℃)，控制器控制第二阀门72打开使第一旁通管路导通，同时第一阀门71、第三阀门73和第四阀门74处于关闭状态，此时循环回路中冷媒的流向为：(1)压缩机→油分离器51→四通换向阀2→室内换热器3→室内电子膨胀阀61→高压储液器53→第二室外电子膨胀阀63→第二室外换热器42→四通换向阀2→气液分离器54→压缩机1；(2)压缩机→油分离器51→第二阀门72→第一室外电子膨胀阀62→第一室外换热器41→四通换向阀2→气液分离器54→压缩机1。这样，既保证了室内换热器3的制热功能，又通过第一旁通管路将部分高温气态冷媒通入第一室外换热器41中，对第一室外换热器41表面的吸附层进行加热，使吸附层吸附的水分蒸发，实现了吸附层的再生。When the difference is less than the first threshold (such as 5°C) and the first temperature is greater than the second threshold (0°C), the indoor ambient temperature is further obtained. If the indoor ambient temperature is greater than the third threshold (such as 26°C), the controller controls The second valve 72 is opened to conduct the first bypass line, while the first valve 71, the third valve 73 and the fourth valve 74 are in a closed state. At this time, the flow direction of the refrigerant in the circulation loop is: (1) Compressor → Oil separator 51→Four-way reversing valve 2→Indoor heat exchanger 3→Indoor electronic expansion valve 61→High pressure accumulator 53→Second outdoor electronic expansion valve 63→Second outdoor heat exchanger 42→Four-way reversing Valve 2 → gas-liquid separator 54 → compressor 1; (2) compressor → oil separator 51 → second valve 72 → first outdoor electronic expansion valve 62 → first outdoor heat exchanger 41 → four-way reversing valve 2→Gas-liquid separator 54→Compressor 1. In this way, the heating function of the indoor heat exchanger 3 is ensured, and part of the high-temperature gaseous refrigerant is passed into the first outdoor heat exchanger 41 through the first bypass pipe to adsorb the surface of the first outdoor heat exchanger 41 The layer is heated to evaporate the water absorbed by the adsorption layer, and the regeneration of the adsorption layer is realized.
当差值小于第一阈值(如5℃)，并且第一温度大于第二阈值(0℃)时，若室内环境温度不大于第三阈值(如26℃)，控制器控制第三阀门73打开使第二旁通管路导通，同时第一阀门71、第二阀门72和第四阀门74处于关闭状态，此时循环回路中冷媒的流向为：(1)压缩机→油分离器51→四通换向阀2→室内换热器3→室内电子膨胀阀61→高压储液器53→第二室外电子膨胀阀63→第二室外换热器42→四通换向阀2→气液分离器54→压缩机1；(2)压缩机→油分离器51→四通换向阀2→室内换热器3→室内电子膨胀阀61→第三阀门73→第一室外电子膨胀阀62→第一室外换热器41→四通换向阀2→气液分离器54→压缩机1。这样，既保证了室内换热器3的制热功能，又通过第二旁通管路将部分高温液态冷媒通入第一室外换热器41中，对第一室外换热器41表面的吸附层进行加热，使吸附层吸附的水分蒸发，实现了吸附层的再生。When the difference is less than the first threshold (such as 5°C) and the first temperature is greater than the second threshold (0°C), if the indoor ambient temperature is not greater than the third threshold (such as 26°C), the controller controls the third valve 73 to open The second bypass pipeline is turned on, and the first valve 71, the second valve 72 and the fourth valve 74 are in a closed state. At this time, the flow of refrigerant in the circulation loop is: (1) compressor→oil separator 51→ Four-way reversing valve 2 → Indoor heat exchanger 3 → Indoor electronic expansion valve 61 → High pressure accumulator 53 → Second outdoor electronic expansion valve 63 → Second outdoor heat exchanger 42 → Four-way reversing valve 2 → Gas-liquid Separator 54 → Compressor 1; (2) Compressor → Oil separator 51 → Four-way reversing valve 2 → Indoor heat exchanger 3 → Indoor electronic expansion valve 61 → Third valve 73 → First outdoor electronic expansion valve 62 → First outdoor heat exchanger 41 → Four-way reversing valve 2 → Gas-liquid separator 54 → Compressor 1. In this way, the heating function of the indoor heat exchanger 3 is ensured, and part of the high-temperature liquid refrigerant is passed into the first outdoor heat exchanger 41 through the second bypass pipe to adsorb the surface of the first outdoor heat exchanger 41 The layer is heated to evaporate the water absorbed by the adsorption layer, and the regeneration of the adsorption layer is realized.
本领域技术人员可以理解的是，室内换热器3的数量不局限于4个，如室内换热器3的数量可以是2个、3个、5个等。第一室外换热器41的数量可以是多个，第二室外换热器42的数量也可以是多个。另外，空调***中也可以不设置过冷却器52和过冷电子膨胀阀64和第四阀门74等。Those skilled in the art can understand that the number of indoor heat exchangers 3 is not limited to 4. For example, the number of indoor heat exchangers 3 may be 2, 3, 5, etc. The number of the first outdoor heat exchanger 41 may be multiple, and the number of the second outdoor heat exchanger 42 may also be multiple. In addition, the subcooler 52, the subcooling electronic expansion valve 64, the fourth valve 74, etc. may not be provided in the air conditioning system.
至此，已经结合附图所示的优选实施方式描述了本发明的技术方案，但是，本领域技术人员容易理解的是，本发明的保护范围显然不局限于这些具体实施方式。在不偏离本发明的原理的前提下，本领域技术人员可以对相关技术特征作出等同的更改或替换，这些更改或替换之后的技术方案都将落入本发明的保护范围之内。So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

  1. 一种空调***的控制方法，其特征在于，所述空调***包括压缩机、四通换向阀、室内换热器以及室外换热器，所述压缩机、所述四通换向阀、所述室内换热器以及所述室外换热器连通形成循环回路，A control method of an air conditioning system, characterized in that the air conditioning system includes a compressor, a four-way reversing valve, an indoor heat exchanger and an outdoor heat exchanger, the compressor, the four-way reversing valve, and the The indoor heat exchanger and the outdoor heat exchanger are connected to form a circulation loop,
    所述室外换热器包括沿室外风机的气流方向依次分布的第一室外换热器和第二室外换热器，所述第一室外换热器的外表面设置有吸附层，The outdoor heat exchanger includes a first outdoor heat exchanger and a second outdoor heat exchanger that are sequentially distributed along the airflow direction of the outdoor fan, and the outer surface of the first outdoor heat exchanger is provided with an adsorption layer,
    所述空调***还包括第一旁通管路和第二旁通管路，在制热模式下，所述压缩机排出的部分冷媒能够通过所述第一旁通管路通入所述第一室外换热器或者所述室内换热器流出的部分冷媒能够通过所述第二旁通管路通入所述第一室外换热器，The air conditioning system further includes a first bypass pipeline and a second bypass pipeline. In the heating mode, part of the refrigerant discharged from the compressor can pass into the first bypass pipeline through the first bypass pipeline. The outdoor heat exchanger or part of the refrigerant flowing out of the indoor heat exchanger can pass into the first outdoor heat exchanger through the second bypass line,
    所述控制方法包括以下步骤：The control method includes the following steps:
    在制热模式下获取气流流经所述第一室外换热器之前的第一温度和第一湿度以及气流流经所述第一室外换热器之后的第二温度和第二湿度；Obtaining the first temperature and the first humidity before the airflow passes through the first outdoor heat exchanger and the second temperature and the second humidity after the airflow passes through the first outdoor heat exchanger in the heating mode;
    根据所述第一温度、所述第二温度、所述第一湿度以及所述第二湿度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及所述空调***的运行模式。According to the first temperature, the second temperature, the first humidity, and the second humidity, the conduction state of the first bypass line and the conduction state of the second bypass line are selectively switched. The conduction state and the operation mode of the air conditioning system.
  2. 根据权利要求1所述的控制方法，其特征在于，“根据所述第一温度、所述第二温度、所述第一湿度以及所述第二湿度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：The control method according to claim 1, wherein “the first bypass pipe is selectively switched according to the first temperature, the second temperature, the first humidity, and the second humidity. The steps of the conduction state of the circuit, the conduction state of the second bypass pipeline, and the operation mode of the air conditioning system include:
    根据所述第一温度和所述第一湿度获得第一露点温度；Obtaining a first dew point temperature according to the first temperature and the first humidity;
    根据所述第二温度和所述第二湿度获得第二露点温度；Obtaining a second dew point temperature according to the second temperature and the second humidity;
    计算所述第一露点温度和所述第二露点温度的差值；Calculating the difference between the first dew point temperature and the second dew point temperature;
    比较所述差值与第一阈值的大小，根据比较结果和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式。Compare the magnitude of the difference with the first threshold, and selectively switch the conduction state of the first bypass line and the conduction state of the second bypass line based on the comparison result and the first temperature And the operating mode of the air conditioning system.
  3. 根据权利要求2所述的控制方法，其特征在于，“根据比较结果 和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：The control method according to claim 2, characterized in that “the conduction state of the first bypass line and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature. The steps of the "conduction state and operation mode of the air-conditioning system" include:
    若所述差值小于所述第一阈值并且所述第一温度大于第二阈值，则使所述第一旁通管路或者所述第二旁通管路处于导通状态。If the difference is less than the first threshold value and the first temperature is greater than the second threshold value, the first bypass line or the second bypass line is placed in a conducting state.
  4. 根据权利要求3所述的控制方法，其特征在于，“根据比较结果和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：The control method according to claim 3, characterized in that “the conduction state of the first bypass line and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature. The steps of the "conduction state and operation mode of the air-conditioning system" include:
    若所述差值小于所述第一阈值并且所述第一温度不大于所述第二阈值，则使所述第一旁通管路和所述第二旁通管路均处于断开状态以及使空调***切换为制冷模式。If the difference is less than the first threshold and the first temperature is not greater than the second threshold, the first bypass pipeline and the second bypass pipeline are both in a disconnected state, and Switch the air conditioning system to cooling mode.
  5. 根据权利要求2所述的控制方法，其特征在于，“根据比较结果和所述第一温度选择性地切换所述第一旁通管路的导通状态、所述第二旁通管路的导通状态以及空调***的运行模式”的步骤包括：The control method according to claim 2, characterized in that “the conduction state of the first bypass line and the conduction state of the second bypass line are selectively switched based on the comparison result and the first temperature. The steps of the "conduction state and operation mode of the air-conditioning system" include:
    若所述差值不小于所述第一阈值，则使所述第一旁通管路和所述第二旁通管路均处于断开状态。If the difference is not less than the first threshold, the first bypass pipeline and the second bypass pipeline are both in a disconnected state.
  6. 根据权利要求3所述的控制方法，其特征在于，“使所述第一旁通管路或者所述第二旁通管路处于导通状态”的步骤之前还包括：The control method according to claim 3, characterized in that, before the step of "making the first bypass pipe or the second bypass pipe in a conducting state", the method further comprises:
    获取室内环境温度；Obtain indoor ambient temperature;
    “使所述第一旁通管路或者所述第二旁通管路处于导通状态”的步骤包括：The step of "making the first bypass pipeline or the second bypass pipeline in a conducting state" includes:
    若所述室内环境温度大于第三阈值，则使所述第一旁通管路处于导通状态。If the indoor ambient temperature is greater than the third threshold, the first bypass pipeline is placed in a conducting state.
  7. 根据权利要求6所述的控制方法，其特征在于，“使所述第一旁通管路或者所述第二旁通管路处于导通状态”的步骤包括：The control method according to claim 6, wherein the step of "making the first bypass pipe or the second bypass pipe in a conducting state" comprises:
    若所述室内环境温度不大于所述第三阈值，则使所述第二旁通管路处于导通状态。If the indoor ambient temperature is not greater than the third threshold, the second bypass pipeline is placed in a conducting state.
  8. 根据权利要求3所述的控制方法，其特征在于，所述控制方法包括：The control method according to claim 3, wherein the control method comprises:
    在所述第一旁通管路导通第一设定时长后使所述第一旁通管路断开；或者Disconnect the first bypass pipeline after the first bypass pipeline is conducted for a first set time; or
    在所述第二旁通管路导通第二设定时长后使所述第二旁通管路断开；Disconnecting the second bypass pipeline after the second bypass pipeline is conducted for a second set period of time;
    其中，所述第一设定时长小于所述第二设定时长。Wherein, the first set duration is less than the second set duration.
  9. 根据权利要求8所述的控制方法，其特征在于，所述第一设定时长和/或所述第二设定时长根据所述第一温度确定。The control method according to claim 8, wherein the first set duration and/or the second set duration are determined according to the first temperature.
  10. 一种空调***，其特征在于，所述空调***包括控制器，所述控制器用于执行权利要求1至9中任一项所述的空调***的控制方法。An air-conditioning system, wherein the air-conditioning system comprises a controller, and the controller is configured to execute the control method of the air-conditioning system according to any one of claims 1 to 9.
PCT/CN2020/094847 2019-11-06 2020-06-08 Air conditioning system and control method therefor WO2021088363A1 (en)

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