CN114484618A - Air conditioner and control method thereof - Google Patents

Air conditioner and control method thereof Download PDF

Info

Publication number
CN114484618A
CN114484618A CN202210089907.4A CN202210089907A CN114484618A CN 114484618 A CN114484618 A CN 114484618A CN 202210089907 A CN202210089907 A CN 202210089907A CN 114484618 A CN114484618 A CN 114484618A
Authority
CN
China
Prior art keywords
compressor
air conditioner
expansion valve
pipeline
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210089907.4A
Other languages
Chinese (zh)
Other versions
CN114484618B (en
Inventor
薛秀夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
Original Assignee
Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningbo Aux Electric Co Ltd, Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd filed Critical Ningbo Aux Electric Co Ltd
Priority to CN202210089907.4A priority Critical patent/CN114484618B/en
Publication of CN114484618A publication Critical patent/CN114484618A/en
Application granted granted Critical
Publication of CN114484618B publication Critical patent/CN114484618B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F1/10—Arrangement or mounting thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • 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
    • F24F11/48—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring prior to normal operation, e.g. pre-heating or pre-cooling
    • 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
    • F24F11/70—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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • 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
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the invention provides an air conditioner and a control method thereof, and belongs to the technical field of air conditioners. The air conditioner includes a first compressor, a second compressor, and a first duct. The discharge port of the second compressor is in communication with the intake port of the first compressor, and the discharge port of the second compressor is in communication with the intake port of the second compressor through a first conduit. The air outlet of the first compressor and the air inlet of the second compressor are used for exchanging heat with the indoor unit. The air conditioner is provided with a first refrigerant circulating flow path and a second refrigerant circulating flow path which run simultaneously when in a running state, wherein the air inlet of the second compressor, the air outlet of the second compressor and the first pipeline in the first refrigerant circulating flow path are communicated in a closed loop mode, and the air inlet of the second compressor, the air outlet of the second compressor, the air inlet of the first compressor, the air outlet of the first compressor and the heat exchanger of the indoor unit in the second refrigerant circulating flow path are communicated in a closed loop mode. The time for starting the air conditioner at extremely low temperature is shortened.

Description

Air conditioner and control method thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and an air conditioner control method.
Background
In recent years, heat pump air conditioners have been increasingly used, and there is an increasing demand for heating operation in an extremely low temperature environment with a lower ambient temperature.
However, when the conventional air conditioner is started at an extremely low temperature, the temperature of the refrigerant in the refrigerant circuit is low, so that the air conditioner needs a long start time when the air conditioner is started for heating.
Disclosure of Invention
The invention solves the problem that when the existing air conditioner is started at extremely low temperature for heating, the air conditioner needs longer starting time when the air conditioner is started for heating because the temperature of a refrigerant in a refrigerant loop is lower.
To solve the above problems, embodiments of the present invention provide an air conditioner and an air conditioner control method, which can reduce the time for heating and starting the air conditioner at an extremely low temperature.
In a first aspect, the present invention provides an air conditioner comprising a first compressor, a second compressor, and a first duct; the gas outlet of the second compressor is communicated with the gas inlet of the first compressor, and the gas outlet of the second compressor is communicated with the gas inlet of the second compressor through the first pipeline; the air outlet of the first compressor and the air inlet of the second compressor are used for communicating with an indoor unit heat exchanger; the air conditioner is provided with a first refrigerant circulating flow path and a second refrigerant circulating flow path which operate simultaneously in an operating state, the air inlet of the second compressor, the air outlet of the second compressor and the first pipeline in the first refrigerant circulating flow path are communicated in a closed loop mode, and the air inlet of the second compressor, the air outlet of the second compressor, the air inlet of the first compressor, the air outlet of the first compressor and the indoor unit heat exchanger in the second refrigerant circulating flow path are communicated in a closed loop mode.
This application is through establishing ties first compressor and second compressor to through the gas vent and the air inlet intercommunication of first pipeline with the second compressor, thereby have the first refrigerant circulation flow path and the second refrigerant circulation flow path of simultaneous operation when the air ware heats the start-up, the air inlet of second compressor in the first refrigerant circulation flow path, the gas vent and the first pipeline closed loop intercommunication of second compressor, the air inlet of second compressor in the second refrigerant circulation flow path the gas vent of second compressor first compressor air inlet, first compressor gas vent, indoor set heat exchanger closed loop intercommunication. Therefore, the second refrigerant circulation flow path can maintain the normal heating cycle of the indoor unit. Meanwhile, the refrigerant compressed by the second compressor is introduced into the second compressor through the first pipeline by using the first refrigerant circulation flow path, so that the temperature of the refrigerant at the air inlet of the second compressor can be increased, the temperature of the refrigerant in the refrigerant loop is increased, and the starting time of the air conditioner during heating starting can be shortened.
In an optional embodiment, the air conditioner further comprises a first valve body, the first valve body is arranged on the first pipeline, and the first valve body is used for controlling the on-off of the first pipeline; the air conditioner has a first operation state that the first valve body is opened, and the first refrigerant circulation flow path and the second refrigerant circulation flow path operate simultaneously in the first operation state; the air conditioner also has a second operation state that the first valve body is closed, and in the second operation state, the air inlet of the second compressor, the air outlet of the second compressor, the air inlet of the first compressor, the air outlet of the first compressor and the heat exchanger of the indoor unit are communicated in a closed loop mode. Through setting up first valve body, when the air conditioner heats and gets into the steady state of heating after the start-up, the gas vent that first valve body can block the second compressor communicates with the air inlet of second compressor to make the air conditioner more energy-conserving when heating the operation.
In an alternative embodiment, the air conditioner further includes a second valve body, a second duct, a third duct, and a fourth duct; the air inlet of the first compressor is communicated with the air inlet of the second compressor through the second pipeline; the exhaust port of the second compressor is communicated with the exhaust port of the first compressor through the third pipeline; the exhaust port of the second compressor is communicated with the air inlet of the first compressor through the fourth pipeline; the second valve body is arranged on the fourth pipeline and used for controlling the on-off of the fourth pipeline; the air conditioner also has a third operation state that the first valve body is closed and the second valve body is opened or closed, and in the third operation state, the first compressor and the second compressor are connected in parallel with the indoor unit heat exchanger. In an alternative embodiment, one end of the second pipeline is connected with the air inlet of the first compressor, the other end of the second pipeline is connected with one end of the first pipeline, the other end of the first pipeline is connected with the air inlet of the second compressor, one end of the fourth pipeline is connected with the air outlet of the second compressor, and the other end of the fourth pipeline is connected with the second pipeline; the first pipeline and the third pipeline are used for being communicated with the indoor unit heat exchanger; in the first operation state of the air conditioner, the first valve body and the second valve body are both in an open state, the air inlet of the second compressor, the air outlet of the second compressor, the fourth pipeline and the first pipeline are communicated in a closed loop mode to form a first refrigerant circulation flow path, and the air inlet of the second compressor, the air outlet of the second compressor, the fourth pipeline, the second pipeline, the air inlet of the first compressor, the air outlet of the first compressor, the third pipeline, the heat exchanger of the indoor unit and the first pipeline are communicated in a closed loop mode to form a second refrigerant circulation flow path; in the second operation state of the air conditioner, the first valve body is in a closed state, the second valve body is in an open state, and the air inlet of the second compressor, the air outlet of the second compressor, the fourth pipeline, the second pipeline, the air inlet of the first compressor, the air outlet of the first compressor, the third pipeline, the heat exchanger of the indoor unit and the first pipeline are communicated in a closed loop manner to form a refrigerant circulation flow path; and in a third running state of the air conditioner, the first valve body is in an open state, the second valve body is in a closed state, and the first compressor and the second compressor are connected in parallel.
This application is through setting up first valve body and second valve body for the air conditioner has three kinds of running state when heating the operation, thereby can select according to service environment and the user demand of difference when the air conditioner uses, makes the air conditioner heat the effect better, and it is more convenient and energy-conserving to use.
In an optional embodiment, the air conditioner further includes a counter flow valve, the counter flow valve is disposed in the first pipeline, the counter flow valve is configured to limit a flow rate of a refrigerant in the first operating state, so that a portion of the refrigerant discharged from the discharge port of the second compressor flows to the discharge port of the first compressor, and another portion of the refrigerant flows to the air inlet of the second compressor, and the counter flow valve is further configured to conduct the first pipeline in the third operating state, so that a portion of the refrigerant flows to the air inlet of the first compressor.
Through setting the counter pressure flow valve, the flow of the refrigerant can be limited when the air conditioner operates in the first operation state, one part of the refrigerant flowing out of the second compression exhaust port flows to the air inlet of the first compressor, and the other part of the refrigerant flows to the air inlet of the second compressor, so that the normal operation of the first refrigerant circulation flow path and the second refrigerant circulation flow path is ensured. In the third operation state, the refrigerant can flow to the air inlet of the first compressor in a large flow rate.
In an optional embodiment, the air conditioner further comprises a check valve, the check valve is installed in the third pipeline, the check valve is used for blocking the third pipeline in the first running state and the second running state, and the check valve is also used for conducting the third pipeline in the third running state. The provision of the check valve allows the third conduit to be blocked in the first operating state and in the second operating state and to be connected in a large flow rate in the third operating state.
In an optional embodiment, the air conditioner further comprises a four-way valve, a fifth pipeline, a sixth pipeline, an outdoor unit heat exchanger, an outdoor unit expansion valve and an indoor unit heat exchanger; one end of the fifth pipeline is connected with the third pipeline, so that the refrigerant flowing out of the exhaust port of the first compressor and/or the refrigerant flowing out of the exhaust port of the second compressor can flow into the fifth pipeline, the other end of the fifth pipeline is communicated with the first interface of the four-way valve, one end of the sixth pipeline is connected with the first pipeline, the other end of the sixth pipeline is communicated with the third interface of the four-way valve, one end of the outdoor unit heat exchanger is communicated with the second interface of the four-way valve, the other end of the outdoor unit heat exchanger is communicated with the outdoor unit expansion valve, one end of the indoor unit heat exchanger is communicated with the outdoor unit expansion valve, and the other end of the indoor unit heat exchanger is communicated with the fourth interface of the four-way valve. The four-way valve can meet the requirements of refrigeration and heating of the air conditioner to adjust the flow direction of the refrigerant.
In an optional embodiment, the air conditioner further includes an auxiliary heat exchange assembly, a third valve body and a seventh pipeline, the auxiliary heat exchange assembly is connected between the outdoor expansion valve and the indoor heat exchanger, the auxiliary heat exchange assembly is communicated with the fourth pipeline, one end of the seventh pipeline is connected with the fourth pipeline, the other end of the seventh pipeline is connected with the first pipeline, the third valve body is disposed on the seventh pipeline, and the third valve body is used for controlling on-off of the seventh pipeline; in the third operating state, the first valve body is in an open state, the second valve body is in a closed state, the third valve body is in an open state, and the auxiliary heat exchange assembly can deliver the heat-exchanged refrigerant to the air inlet of the first compressor and the air inlet of the second compressor. The third valve body and the auxiliary heat exchange assembly are arranged, so that energy can be recovered and reused, and the energy consumption of the air conditioner is reduced.
In a second aspect, the present invention provides an air conditioner control method applied to the air conditioner of the foregoing embodiment, the control method including:
acquiring the outdoor environment temperature;
judging whether the outdoor environment temperature is lower than a preset outdoor environment temperature or not under the condition of receiving a heating instruction;
and if the outdoor environment temperature is lower than the preset outdoor environment temperature, configuring starting operation parameters of the air conditioner, controlling the first valve body and the second valve body to be opened, controlling the first interface and the fourth interface of the four-way valve to be communicated, and controlling the air conditioner to operate according to the first operation state.
The control method of the air conditioner judges whether the outdoor environment temperature is lower than the preset outdoor environment temperature or not under the condition of receiving the heating instruction, the outdoor environment temperature is lower than the preset outdoor environment temperature, the starting operation parameters of the air conditioner are configured, the first valve body and the second valve body are controlled to be opened, the first interface and the fourth interface of the four-way valve are controlled to be communicated, the air conditioner is controlled to operate according to the first operation state, the air conditioner is enabled to have a first refrigerant circulation flow path and a second refrigerant circulation flow path which operate simultaneously when the air conditioner is heated and started, the air inlet of the second compressor in the first refrigerant circulation flow path, the air outlet of the second compressor and the first pipeline are communicated in a closed loop mode, the air inlet of the second compressor in the second refrigerant circulation flow path, the air outlet of the second compressor, the air inlet of the first compressor, the air outlet of the first compressor, The indoor heat exchanger is communicated in a closed loop mode. Therefore, the second refrigerant circulation flow path can maintain the normal heating cycle of the indoor unit. Meanwhile, the refrigerant compressed by the second compressor is introduced into the second compressor through the first pipeline by using the first refrigerant circulation flow path, so that the temperature of the refrigerant at the air inlet of the second compressor can be increased, the temperature of the refrigerant in the refrigerant loop is increased, and the starting time of the air conditioner during heating starting can be shortened.
In an alternative embodiment, the step of configuring the start-up operation parameters of the air conditioner includes:
controlling the starting frequency of the first compressor to be one half of the rated starting frequency of the first compressor;
controlling the starting frequency of the second compressor to be twice of the starting frequency of the first compressor;
and controlling the opening degree of the outdoor unit expansion valve to be the lowest opening degree.
According to the method, the starting frequency of the first compressor is half of the rated starting frequency of the first compressor, the starting frequency of the second compressor is twice of the starting frequency of the first compressor, the opening degree of the outdoor unit expansion valve is the lowest opening degree, the circulation amount of the first compressor and the circulation amount of the second compressor can be adjusted, and the medium pressure can be adjusted to the pressure with the highest operation efficiency.
In an alternative embodiment, after the step of controlling the air conditioner to operate in the first operation state, the control method further includes:
acquiring the superheat degree of the exhaust port of the second compressor and the superheat degree of the air inlet of the first compressor;
and if the superheat degree of the exhaust port of the first compressor is larger than the preset exhaust heat degree and the superheat degree of the air inlet of the second compressor is larger than the preset suction superheat degree, controlling the air conditioner to perform heating operation in the second operation state or the third operation state.
This application through the superheat degree of first compressor gas vent and the superheat degree of second compressor air inlet can be convenient judge whether the air conditioner starts the completion, starts to control the air conditioner with second running state or third running state operation after the completion at the air conditioner, can make the air conditioner heat the effectual of operation, simultaneously, can let the operation of air conditioner more energy-conserving.
In an alternative embodiment, the step of controlling the air conditioner to perform the heating operation in the second operation state or the third operation state includes:
acquiring low pressure values of the first compressor and the second compressor, and/or acquiring compression ratios of the first compressor and the second compressor;
and if the low pressure value of the first compressor and the second compressor is smaller than the preset low pressure value or the compression ratio of the first compressor and the second compressor is larger than the preset compression ratio, controlling the first valve body to be closed and the second valve body to be opened, configuring the operation parameters of the air conditioner in the second operation state, and controlling the air conditioner to operate in the second operation state.
According to the air conditioner, the air conditioner can be conveniently controlled to run in the second running state or the third running state according to the low pressure value of the first compressor and the second compressor or the compression ratio of the first compressor and the second compressor, the air conditioner and the environment are more pointed, and the air conditioner is more energy-saving in use.
In an optional embodiment, the step of controlling the air conditioner to perform the heating operation in the second operation state or the third operation state further includes:
and if the low pressure value of the first compressor and the second compressor is larger than a preset low pressure value or the compression ratio of the first compressor and the second compressor is smaller than a preset compression ratio, controlling the first valve body to be opened and the second valve body to be closed, configuring the operation parameters of the air conditioner in the third operation state, and controlling the air conditioner to operate in the third operation state.
According to the air conditioner, the air conditioner can be conveniently controlled to run in the second running state or the third running state according to the low pressure value of the first compressor and the second compressor or the compression ratio of the first compressor and the second compressor, the air conditioner and the environment are more pointed, and the air conditioner is more energy-saving in use.
In an optional embodiment, the air conditioner further includes an indoor unit expansion valve, and the indoor unit expansion valve is connected in series between the indoor unit heat exchanger and the outdoor expansion valve;
the step of configuring the operation parameters of the second operation state of the air conditioner:
acquiring the pressure of the air inlet of the second compressor at the current moment, acquiring the pressure of the air outlet of the first compressor at the current moment, acquiring the superheat degree of the outlet of the heat exchanger of the outdoor unit at the current moment, acquiring the opening degree of an expansion valve of the outdoor unit at the current moment, acquiring the current opening degree of the expansion valve of the indoor unit and acquiring the supercooling degree of the outlet of the heat exchanger of the indoor unit;
the medium pressure is calculated according to the following formula:
Pm＝(Ph*Ps)^(1/2)；
Pmdenotes medium pressure, PhRepresenting the first compressor discharge pressure, PsRepresenting a second compressor inlet pressure;
determining a first refrigerant density corresponding to the medium pressure and a second refrigerant density corresponding to the second compressor air inlet pressure according to a refrigerant physical property table;
calculating the operating frequency of the second compressor at the next moment according to the following formula:
Hzs(t+1)＝Hzs(t+1)*(ρm/ρs)/(1+α)；
Hzs(t+1)representing the operating frequency, p, of the second compressor at the next moment in timehDenotes the first refrigerant density, rhosExpressing the density of the second refrigerant, wherein alpha represents the injection enthalpy circulation volume ratio, and the value of alpha is 0.15-0.30;
controlling the second compressor to work at Hz at the next moments(t+1)The frequency of (2) is running;
calculating a frequency adjustment value of the first compressor according to the following formula:
△Hzh＝fx(Pg-Ph)；
△Hzhindicating the frequency adjustment value, P, of the first compressorgRepresenting the target pressure, PhRepresenting a discharge port pressure of the first compressor;
calculating the operating frequency of the first compressor at the next moment according to the following formula:
△Hz＝fx(Pg-Ph)；
Δ Hz represents the frequency adjustment value，PgRepresenting the target pressure, PhRepresenting a discharge port pressure of the first compressor or a discharge port pressure of the second compressor;
calculating the operating frequency of the first compressor at the next moment according to the following formula:
Hzh(t+1)＝Hzh(t)+△Hz；
Hzh(t+1)representing the operating frequency of the first compressor at the next moment in time, Hzh(t)Representing the operating frequency of the first compressor at the present moment;
controlling the first compressor to work at Hz at the next momenth(t+1)The frequency of (2) is running;
calculating the adjustment value of the opening degree of the outdoor unit expansion valve according to the following formula:
△Pls＝gx(SHG–SH)；
△Plsindicating the opening degree adjustment value of the outdoor unit expansion valve, SHGIndicates the target degree of superheat, SHRepresenting the superheat degree of an outlet of a heat exchanger of the outdoor unit;
calculating the opening degree of the outdoor unit expansion valve at the next moment according to the following formula;
Pls(t+1)＝Pls(t)+△Pls；
Pls(t+1)opening degree of expansion valve of outdoor unit, P, at the next timels(t)An opening degree of the outdoor unit expansion valve indicating a current time;
controlling the next time of the outdoor unit expansion valve to be Pls(t+1)Opening operation;
calculating the adjustment value of the opening degree of the expansion valve of the indoor unit according to the following formula:
△Plsc＝kx(ScG–Sc)；
△Plscrepresents the opening degree adjustment value S of the expansion valve of the indoor unitcGIndicates the target degree of subcooling, SHThe supercooling degree of the outlet of the outdoor unit heat exchanger is shown;
calculating the opening degree of the expansion valve of the indoor unit at the next moment according to the following formula;
Plsc(t+1)＝Plsc(t)+△Plsc；
Plsc(t+1)opening degree of expansion valve of indoor unit, P, at next momentlsc(t)An opening degree of the indoor unit expansion valve indicating a current time;
controlling the next time of the expansion valve of the indoor unit to be Pls(t+1)And (4) opening operation.
This application is through when the second running state, through adjusting the operating parameter to the air conditioner to can let the running state and the operating parameter of air conditioner match more, let the heating operation effect of air conditioner better.
In an optional embodiment, the air conditioner further includes an indoor unit expansion valve, and the indoor unit expansion valve is connected in series between the indoor unit heat exchanger and the outdoor expansion valve;
the step of configuring the operation parameters of the third operation state of the air conditioner includes:
acquiring the pressure of the exhaust ports of the first compressor and the second compressor, the running frequency of the first compressor and the second compressor, the superheat degree of the outlet of the outdoor unit heat exchanger at the current moment, the opening degree of the outdoor unit expansion valve, the current opening degree of the indoor unit expansion valve and the supercooling degree of the outlet of the indoor unit heat exchanger at the current moment;
calculating frequency adjustment values for the first and second compressors according to the following formula:
△Hz＝fx(Pg-Ph)；
Δ Hz represents the frequency adjustment of the first and second compressors, PgRepresenting the target pressure, PhRepresenting a discharge port pressure of the first compressor or a discharge port pressure of the second compressor;
calculating the operating frequencies of the first compressor and the second compressor at the next moment according to the following formula:
Hz(t+1)＝Hz(t)+△Hz；
Hz(t+1)indicating the next moment of said first compressor andoperating frequency of the second compressor, Hz(t)Representing the operating frequencies of the first compressor and the second compressor at the current moment;
controlling the first compressor and the second compressor to work at Hz at the next moment(t+1)Frequency operation;
calculating the adjustment value of the opening degree of the outdoor unit expansion valve according to the following formula:
△Pls＝gx(SHG–SH)；
△Plsindicating the opening degree adjustment value of the outdoor unit expansion valve, SHGIndicates the target degree of superheat, SHRepresenting the superheat degree of an outlet of a heat exchanger of the outdoor unit;
calculating the opening degree of the outdoor unit expansion valve at the next moment according to the following formula;
Pls(t+1)＝Pls(t)+△Pls；
Pls(t+1)opening degree of expansion valve of outdoor unit, P, at the next timels(t)An opening degree of the outdoor unit expansion valve indicating a current time;
controlling the next time of the outdoor unit expansion valve to be Pls(t+1)Opening operation;
calculating the adjustment value of the opening degree of the expansion valve of the indoor unit according to the following formula:
△Plsc＝kx(ScG–Sc)；
△Plscrepresents the opening degree adjustment value S of the expansion valve of the indoor unitcGIndicates the target degree of subcooling, SHThe supercooling degree of the outlet of the outdoor unit heat exchanger is shown;
calculating the opening degree of the expansion valve of the indoor unit at the next moment according to the following formula;
Plsc(t+1)＝Plsc(t)+△Plsc；
Plsc(t+1)opening degree of expansion valve of indoor unit, P, at the next momentlsc(t)An opening degree of the indoor unit expansion valve indicating a current time;
controlling the next time of the expansion valve of the indoor unit to be Pls(t+1)And (4) opening operation.
This application is through when the third running state, through adjusting the operating parameter to the air conditioner to can let the running state and the operating parameter of air conditioner match more, let the heating operation effect of air conditioner better.
In an optional embodiment, when the air conditioner receives a cooling command, the control method includes:
controlling a first interface and a second interface of the four-way valve to be communicated;
the first valve body is opened and the second valve body is closed;
configuring refrigeration operation parameters;
and controlling the air conditioner to perform refrigerating operation.
The air conditioner of this application is when receiving refrigeration instruction, opens through the first valve body of control and closes with the second valve body for first compressor and second compressor are established ties, thereby make the refrigeration effect of air conditioner better.
In an alternative embodiment, the step of configuring the cooling operation parameter comprises:
acquiring the air inlet pressures of the first compressor and the second compressor at the current moment and the current-moment operating frequencies of the first compressor and the second compressor;
calculating frequency adjustment values for the first and second compressors according to the following formula:
△Hz＝fx(Pg-Ps)；
Δ Hz represents the frequency adjustment of the first and second compressors, PgRepresenting the target pressure, PsRepresenting the inlet pressure of the first compressor or the inlet pressure of the second compressor;
calculating the operating frequencies of the first compressor and the second compressor at the next moment according to the following formula:
Hz(t+1)＝Hz(t)+△Hz；
Hz(t+1)representing the operating frequency, Hz, of the first and second compressors at the next moment(t)Indicating the current timeCarving the operating frequency of the first compressor and the second compressor;
controlling the first compressor and the second compressor to work at Hz at the next moment(t+1)The frequency is run.
This application is through configuring the parameter when the air conditioner operation of refrigerating for the air conditioner operation parameter and running condition match more when refrigerating the operation, make the refrigeration effect of air conditioner better.
Drawings
Fig. 1 is a schematic view of an overall structure of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic flow direction diagram of a refrigerant flowing in a first operation state of an air conditioner according to an embodiment of the present invention;
fig. 3 is a schematic flow direction diagram of a refrigerant flowing in a second operation state of the air conditioner according to the embodiment of the present invention;
fig. 4 is a schematic flow direction diagram of a refrigerant flowing in a third operating state of the air conditioner according to the embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a refrigerant flow direction of an air conditioner according to an embodiment of the present invention during a cooling operation;
FIG. 6 is a schematic cross-sectional view of a back pressure flow valve of an air conditioner according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating an air conditioner control method according to an embodiment of the present invention;
fig. 8 is a schematic flowchart illustrating a switching process from a first operation state to a second operation state or a third operation state in an air conditioner control method according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating parameter configuration under a second operation state of the air conditioner control method according to the embodiment of the present invention;
fig. 10 is a flowchart illustrating a parameter configuration under a third operation condition of the air conditioner control method according to the embodiment of the present invention;
fig. 11 is a flowchart illustrating a cooling operation state of an air conditioner control method according to an embodiment of the present invention;
fig. 12 is a flowchart illustrating parameter configuration during cooling operation of the air conditioner control method according to an embodiment of the present invention.
Description of reference numerals:
1-a first compressor; 2-a second compressor; 3-a first conduit; 4-a first valve body; 5-a second valve body; 6-a second conduit; 7-a third conduit; 8-a fourth conduit; 9-reverse pressure flow valve; 91-valve seat; 92-a valve core; 93-a first flow channel; 94-a second flow channel; 10-a check valve; 11-a four-way valve; 12-a fifth pipeline; 13-a sixth conduit; 14-outdoor unit heat exchanger; 15-outdoor unit expansion valve; 16-indoor heat exchanger; 17-an auxiliary heat exchange assembly; 171-auxiliary heat exchanger; 172-an auxiliary heat exchange expansion valve; 18-a third valve body; 19-a seventh conduit; 20-indoor unit expansion valve; 100-air conditioner.
Detailed Description
When the existing air conditioner is started at extremely low temperature, the air conditioner needs longer starting time when heating is started due to the fact that the temperature of a refrigerant in a refrigerant loop is low. In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 and fig. 2, the present embodiment provides an air conditioner 100, where the air conditioner 100 includes a first compressor 1, a second compressor 2, and a first pipeline 3; the exhaust port of the second compressor 2 communicates with the intake port of the first compressor 1, and the exhaust port of the second compressor 2 communicates with the intake port of the second compressor 2 through a first pipe 3; the air outlet of the first compressor 1 and the air inlet of the second compressor 2 are used for connecting an indoor unit heat exchanger 16; the air conditioner 100 has a first refrigerant circulation flow path and a second refrigerant circulation flow path which operate simultaneously when the air conditioner 100 is in an operating state, wherein an air inlet of the second compressor 2, an air outlet of the second compressor 2 and the first pipeline 3 in the first refrigerant circulation flow path are communicated in a closed loop mode, and an air inlet of the second compressor 2, an air outlet of the second compressor 2, an air inlet of the first compressor 1, an air outlet of the first compressor 1 and the indoor unit heat exchanger 16 in the second refrigerant circulation flow path are communicated in a closed loop mode.
This application is through establishing ties first compressor 1 and second compressor 2 to through first pipeline 3 with the gas vent and the air inlet intercommunication of second compressor 2, thereby have the first refrigerant circulation flow path and the second refrigerant circulation flow path of simultaneous operation when the air ware heats the start-up, the air inlet of second compressor 2 in the first refrigerant circulation flow path, the gas vent and the 3 closed loop intercommunications of first pipeline of second compressor 2, the air inlet of second compressor 2 in the second refrigerant circulation flow path, the gas vent of second compressor 2, first compressor 1 air inlet, first compressor 1 gas vent, indoor set heat exchanger 16 closed loop intercommunication. Therefore, the second refrigerant circulation flow path can maintain the normal heating cycle of the indoor unit. Meanwhile, the refrigerant compressed by the second compressor 2 is introduced into the second compressor 2 through the first pipeline 3 by using the first refrigerant circulation flow path, so that the temperature of the refrigerant at the air inlet of the second compressor 2 can be increased, the temperature of the refrigerant in the refrigerant loop is increased, and the starting time of the air conditioner 100 during heating starting can be shortened.
In this embodiment, the air conditioner 100 further includes a first valve body 4, the first valve body 4 is disposed in the first pipeline 3, and the first valve body 4 is used for controlling on/off of the first pipeline 3; the air conditioner 100 has a first operation state in which the first valve body 4 is opened, and the first refrigerant circulation flow path and the second refrigerant circulation flow path operate simultaneously in the first operation state; the air conditioner 100 further has a second operation state in which the first valve body 4 is closed, and in the second operation state, the air inlet of the second compressor 2, the air outlet of the second compressor 2, the air inlet of the first compressor 1, the air outlet of the first compressor 1 and the indoor unit heat exchanger are communicated in a closed loop manner. Through setting up first valve body 4, when air conditioner 100 heats and gets into the steady state of heating after the start-up, first valve body 4 can block the gas vent of second compressor 2 and the air inlet intercommunication of second compressor 2 to make air conditioner 100 more energy-conserving when heating the operation.
In this embodiment, the first valve body 4 is an electromagnetic valve, but in other embodiments of the present application, the first valve body 4 may also be other types of electrically controlled valves.
Referring to fig. 1, 2, 3 and 4, in the present embodiment, the air conditioner 100 further includes a second valve body 5, a second pipe 6, a third pipe 7 and a fourth pipe 8; the air inlet of the first compressor 1 is communicated with the air inlet of the second compressor 2 through a second pipeline 6; the exhaust port of the second compressor 2 is communicated with the exhaust port of the first compressor 1 through a third pipeline 7; the exhaust port of the second compressor 2 is communicated with the intake port of the first compressor 1 through a fourth pipeline 8; the second valve body 5 is arranged on the fourth pipeline 8, and the second valve body 5 is used for controlling the on-off of the fourth pipeline 8; the air conditioner 100 also has a third operating state in which the first valve body 4 is closed and the second valve body 5 is opened or closed, and in the third operating state, the first compressor 1 and the second compressor 2 are connected in parallel to the indoor unit heat exchanger 16. In an alternative embodiment, one end of the second pipeline 6 is connected with the air inlet of the first compressor 1, the other end of the second pipeline 6 is connected with one end of the first pipeline 3, the other end of the first pipeline 3 is connected with the air inlet of the second compressor 2, one end of the fourth pipeline 8 is connected with the air outlet of the second compressor 2, and the other end of the fourth pipeline 8 is connected with the second pipeline 6; the first pipeline 3 and the third pipeline 7 are used for being communicated with an indoor unit heat exchanger 16; in a first operation state of the air conditioner 100, the first valve body 4 and the second valve body 5 are both in an open state, the air inlet of the second compressor 2, the air outlet of the second compressor 2, the fourth pipeline 8 and the first pipeline 3 are communicated in a closed loop manner to form a first refrigerant circulation flow path, and the air inlet of the second compressor 2, the air outlet of the second compressor 2, the fourth pipeline 8, the second pipeline 6, the air inlet of the first compressor 1, the air outlet of the first compressor 1, the third pipeline 7, the indoor unit heat exchanger and the first pipeline 3 are communicated in a closed loop manner to form a second refrigerant circulation flow path; in a second operation state of the air conditioner 100, the first valve body 4 is in a closed state, the second valve body 5 is in an open state, and an air inlet of the second compressor 2, an air outlet of the second compressor 2, the fourth pipeline 8, the second pipeline 6, an air inlet of the first compressor 1, an air outlet of the first compressor 1, the third pipeline 7, an indoor unit heat exchanger and the first pipeline 3 are communicated in a closed loop mode to form a refrigerant circulation flow path; in the third operating state of the air conditioner 100, the first valve body 4 is in an open state, the second valve body 5 is in a closed state, and the first compressor 1 and the second compressor 2 are connected in parallel.
This application is through setting up first valve body 4 and second valve body 5 for air conditioner 100 has three kinds of running state when heating operation, thereby can select according to service environment and the user demand of difference when air conditioner 100 uses, makes air conditioner 100 heat the effect better, and it is more convenient and energy-conserving to use.
In this embodiment, the second valve body 5 is also an electromagnetic valve, but in other embodiments of the present application, the second valve body 5 may also be other types of electrically controlled valves.
In this embodiment, the air conditioner 100 further includes a counter flow valve 9, the counter flow valve 9 is disposed in the first pipeline 3, the counter flow valve 9 is configured to limit a flow rate of the refrigerant in the first operating state, so that a portion of the refrigerant discharged from the discharge port of the second compressor 2 flows to the discharge port of the first compressor 1, and another portion of the refrigerant flows to the intake port of the second compressor 2, and the counter flow valve 9 is further configured to conduct the first pipeline 3 in the third operating state, so that a portion of the refrigerant flows to the intake port of the first compressor 1.
Referring to fig. 6, in the embodiment, the reverse flow valve 9 includes a valve seat 91 and a valve core 92, the valve core 92 is movably installed in the valve seat 91, and a first flow passage 93 is formed between the side wall of the valve body 92 and the side wall of the valve seat 91, the valve body 92 is provided with a second flow passage 94, the diameter of the second flow passage 94 is relatively small, in the first operation state, because one side of the reverse pressure flow valve 9 is a high-pressure refrigerant and the other side is a low-pressure refrigerant, therefore, a pressure difference is formed between the two sides of the valve core 92, the valve core 92 moves under the action of the pressure difference, so that the first flow channel 93 is closed by the valve core 92, at this time, a part of the refrigerant flowing out of the exhaust port of the second compressor 2 flows to the intake port of the first compressor 1, and the other part of the refrigerant flows to the intake port of the second compressor 2 from the second flow channel 94 to form a second refrigerant circulation loop, so that the first refrigerant circulation loop and the second refrigerant circulation loop are performed simultaneously. In the second operation state, the first compressor 1 and the second compressor 2 are connected in parallel, so that the valve core 92 is pushed by the refrigerant, the valve core 92 can open the first flow channel 93, and at the moment, the refrigerant can flow to the air inlet of the first compressor 1 through the first flow channel 93 and the second flow channel together, so that different flow rates are realized when the refrigerant flows in two opposite directions.
By arranging the counter pressure flow valve 9, the flow of the refrigerant can be limited when the air conditioner 100 operates in the first operation state, and a part of the refrigerant flowing out of the second compression exhaust port flows to the air inlet of the first compressor 1, and the other part of the refrigerant flows to the air inlet of the second compressor 2, so that the normal operation of the first refrigerant circulation flow path and the second refrigerant circulation flow path is ensured. In the third operating state, the refrigerant can flow to the inlet of the first compressor 1 at a large flow rate.
In this embodiment, the air conditioner 100 further includes a check valve 10, the check valve 10 is installed in the third pipeline 7, the check valve 10 is used for blocking the third pipeline 7 in the first operation state and the second operation state, and the check valve 10 is further used for conducting the third pipeline 7 in the third operation state. The provision of the non-return valve 10 makes it possible to block the third duct 7 in the first operating state and in the second operating state and to put the third duct 7 into communication at a high flow rate in the third operating state.
In this embodiment, the check valve 10 and the reverse flow valve 9 are substantially identical in construction, except that the valve spool 92 of the reverse flow valve 9 does not have a second flow passage 94. In the first or second operating state of the air conditioner 100, the valve core 92 moves to allow all of the refrigerant flowing out of the outlet of the second compressor 2 to flow into the first pipe 3 due to the pressure difference between the two sides of the check valve 10. When the air conditioner 100 operates in the third operating state, the valve core 92 opens the flow passage to allow the refrigerant discharged from the outlet of the second compressor 2 to flow into the third pipe 7 because the pressure difference between both sides of the back pressure valve is substantially the same.
In this embodiment, the air conditioner 100 further includes a four-way valve 11, a fifth pipeline 12, a sixth pipeline 13, an outdoor heat exchanger 14, an outdoor expansion valve 15, and an indoor heat exchanger 16; one end of a fifth pipeline 12 is connected to the third pipeline 7, so that the refrigerant flowing out of the exhaust port of the first compressor 1 and/or the refrigerant flowing out of the exhaust port of the second compressor 2 can flow into the fifth pipeline 12, the other end of the fifth pipeline 12 is communicated with the first port of the four-way valve 11, one end of a sixth pipeline 13 is connected to the first pipeline 3, the other end is communicated with the third port of the four-way valve 11, one end of an outdoor heat exchanger 14 is communicated with the second port of the four-way valve 11, the other end is communicated with an outdoor expansion valve 15, one end of an indoor heat exchanger 16 is communicated with the outdoor expansion valve 15, and the other end is communicated with the fourth port of the four-way valve 11. The four-way valve 11 can adjust the flow direction of the refrigerant in consideration of the cooling and heating requirements of the air conditioner 100.
In the present embodiment, the air conditioner 100 is a multi-connected air conditioner 100, that is, a plurality of indoor units correspond to one outdoor unit. The air conditioner 100 further includes an indoor expansion valve 20, and the indoor expansion valve 20 is connected in series between the indoor heat exchanger and the outdoor expansion valve; in other embodiments of the present application, the air conditioner 100 may be a conventional one-to-one air conditioner 100.
In this embodiment, the air conditioner 100 further includes an auxiliary heat exchange assembly 17, a third valve 18 and a seventh pipe 19, the auxiliary heat exchange assembly 17 is connected between the outdoor expansion valve 15 and the indoor expansion valve 20, the auxiliary heat exchange assembly 17 is communicated with the fourth pipe 8, one end of the seventh pipe 19 is connected with the fourth pipe 8, the other end of the seventh pipe is connected with the first pipe 3, the third valve 18 is disposed on the seventh pipe 19, and the third valve 18 is used for controlling the on/off of the seventh pipe 19; in the third operating state, the first valve element 4 is in an open state, the second valve element 5 is in a closed state, the third valve element 18 is in an open state, and the auxiliary heat exchange assembly 17 can deliver the heat-exchanged refrigerant to the air inlet of the first compressor 1 and the air inlet of the second compressor 2. The provision of the third valve body 18 and the auxiliary heat exchange assembly 17 allows for energy recovery and reuse, reducing the energy consumption of the air conditioner 100.
In the present embodiment, the auxiliary heat exchange unit 17 includes an auxiliary heat exchanger 171 and an auxiliary heat exchange expansion valve 172, the auxiliary heat exchanger 171 is connected between the outdoor expansion valve 15 and the indoor expansion valve 20, the auxiliary heat exchanger 171 communicates with the auxiliary heat exchanger 171 at one end of the expansion valve, communicates with the outdoor expansion valve at the other end, and communicates with the auxiliary heat exchanger 171 and the fourth pipe 8. The auxiliary heat exchanger 171 and the expansion valve of the auxiliary heat exchanger 171 are provided to recover heat during the heating operation. In the third operating state, the third valve body 18 and the auxiliary heat exchange expansion valve 172 are opened, and the refrigerant heated by the auxiliary heat exchanger 171 can be introduced into the intake port of the first compressor 1 and the intake port of the second compressor 2.
Referring to fig. 7, an embodiment of the present invention provides a method for controlling the air conditioner 100, where the method includes:
s1, acquiring outdoor environment temperature;
s2 judging whether the outdoor environment temperature is lower than the preset outdoor environment temperature under the condition of receiving the heating instruction;
s3 determines whether the outdoor temperature is lower than a preset outdoor temperature, and if so, configures start operation parameters of the air conditioner 100, controls both the first valve body 4 and the second valve body 5 to open, controls the first interface and the fourth interface of the four-way valve 11 to communicate, and controls the air conditioner 100 to start and operate according to the first operation state.
The control method of the air conditioner 100 of the application judges whether the outdoor environment temperature is lower than the preset outdoor environment temperature or not under the condition of receiving the heating instruction, configures the starting operation parameters of the air conditioner 100 when the outdoor environment temperature is lower than the preset outdoor environment temperature, controls the first valve body 4 and the second valve body 5 to be opened, controls the first interface and the fourth interface of the four-way valve 11 to be communicated, and controls the air conditioner 100 to operate according to the first operation state, so that the air conditioner 100 has a first refrigerant circulation flow path and a second refrigerant circulation flow path which operate simultaneously when heating is started, an air inlet of the second compressor 2, an air outlet of the second compressor 2 and a first pipeline 3 in the first refrigerant circulation flow path are communicated in a closed loop manner, an air inlet of the second compressor 2, an air outlet of the second compressor 2, an air inlet of the first compressor 1, an air outlet of the first compressor 1, a heat exchanger in the second refrigerant circulation flow path, The indoor heat exchanger 16 is communicated in a closed loop mode. Therefore, the second refrigerant circulation flow path can maintain the normal heating cycle of the indoor unit. Meanwhile, the refrigerant compressed by the second compressor 2 is introduced into the second compressor 2 through the first pipeline 3 by using the first refrigerant circulation flow path, so that the temperature of the refrigerant at the air inlet of the second compressor 2 can be increased, the temperature of the refrigerant in the refrigerant loop is increased, and the starting time of the air conditioner 100 during heating starting can be shortened.
In this example, the preset ambient temperature is-5 ℃. Of course, in other embodiments of the present application, the preset ambient temperature may also be-10 ℃, or the preset ambient temperature may be set and adjusted according to the temperature of the area in actual use. It is understood that the embodiment of the present invention does not limit the temperature value of the preset ambient temperature.
In the present embodiment, the step of configuring the start-up operation parameters of the air conditioner 100 includes:
s31 controlling the starting frequency of the first compressor 1 to be one-half of the rated starting frequency of the first compressor 1; controlling the starting frequency of the second compressor 2 to be twice of the starting frequency of the first compressor 1; controlling the opening degree of the outdoor unit expansion valve 15 to be the minimum opening degree; controlling the outdoor unit expansion valve 15 to a minimum opening degree; the thermally assisted heat exchange expansion valve 172 is controlled to be fully closed.
In the present invention, the starting frequency of the first compressor 1 is one-half of the rated starting frequency of the first compressor 1, the starting frequency of the second compressor 2 is twice the starting frequency of the first compressor 1, the circulation amounts of the first compressor 1 and the second compressor 2 can be adjusted by setting the opening degree of the outdoor unit expansion valve 15 to the minimum opening degree, and the medium pressure can be adjusted to the pressure with the highest operation efficiency.
In the present embodiment, after the step of controlling the air conditioner 100 to operate in the first operation state, the control method further includes:
s4, acquiring the superheat degree of the exhaust port of the second compressor 2 and the superheat degree of the air inlet of the first compressor 1;
s5, judging whether the superheat degree of the exhaust port of the first compressor 1 is larger than the preset exhaust heat degree and whether the superheat degree of the air inlet of the second compressor 2 is larger than the preset suction superheat degree;
and S6, if the superheat degree of the exhaust port of the first compressor 1 is larger than the preset exhaust heat degree and the superheat degree of the air inlet of the second compressor 2 is larger than the preset suction superheat degree, controlling the air conditioner 100 to perform heating operation in a second operation state or a third operation state.
This application through the superheat degree of the 1 gas vent of first compressor and the superheat degree of the 2 air intakes of second compressor judge that whether air conditioner 100 starts the completion, control air conditioner 100 after air conditioner 100 starts the completion and move with second running state or third running state, can make the effectual of air conditioner 100 operation of heating, simultaneously, can let air conditioner 100's operation more energy-conserving.
In the present embodiment, the preset exhaust superheat is 10k, and the preset suction superheat is 3 k. Of course, in other embodiments of the present application, the preset discharge superheat and the preset suction superheat may be set according to the type of the compressor and the usage environment.
Referring to fig. 8, in the present embodiment, the step of controlling the air conditioner 100 to perform the heating operation in the second operation state or the third operation state includes:
s61 obtaining low pressure values of the first compressor 1 and the second compressor 2, and/or obtaining compression ratios of the first compressor 1 and the second compressor 2;
s62 judges whether the low pressure value of the first compressor 1 and the second compressor 2 is less than a preset low pressure value or whether the compression ratio of the first compressor 1 and the second compressor 2 is greater than a preset compression ratio;
s63, if the low pressure value of the first compressor 1 and the second compressor 2 is less than the preset low pressure value or the compression ratio of the first compressor 1 and the second compressor 2 is greater than the preset compression ratio, controlling the first valve 4 to close and the second valve 5 to open, configuring the operation parameter of the second operation state of the air conditioner 100, and controlling the air conditioner 100 to operate in the second operation state.
In the present embodiment, the preset low pressure value is 0.6mpa (g), and the preset compression ratio is 2.0. Of course, in other embodiments of the present application, the preset low pressure value and the preset compression ratio may be selected according to the type and the field of use of the compressor.
According to the low-pressure values of the first compressor 1 and the second compressor 2 or the compression ratios of the first compressor 1 and the second compressor 2, the air conditioner can be conveniently controlled to operate in the second operation state or the third operation state, the air conditioner 100 and the environment have pertinence, and therefore the air conditioner 100 is more energy-saving in use.
In this embodiment, the step of controlling the air conditioner 100 to perform the heating operation in the second operation state or the third operation state further includes:
s64, if the low pressure value of the first compressor 1 and the second compressor 2 is greater than or equal to the preset low pressure value or the compression ratio of the first compressor 1 and the second compressor 2 is less than or equal to the preset compression ratio, controlling the first valve body 4 to open and the second valve body 5 to close, configuring the operation parameter of the third operation state of the air conditioner 100, and controlling the air conditioner 100 to operate in the third operation state.
According to the low-pressure values of the first compressor 1 and the second compressor 2 or the compression ratios of the first compressor 1 and the second compressor 2, the air conditioner can be conveniently controlled to operate in the second operation state or the third operation state, the air conditioner 100 and the environment have pertinence, and therefore the air conditioner 100 is more energy-saving in use.
Referring to fig. 9, the step of configuring the operation parameters of the second operation state of the air conditioner 100 includes:
s631, acquiring the pressure of the air inlet of the second compressor 2 at the current moment, acquiring the pressure of the air outlet of the first compressor 1 at the current moment, acquiring the superheat degree of the outlet of the outdoor unit heat exchanger 14 at the current moment, acquiring the opening degree of the outdoor unit expansion valve 15 at the current moment, acquiring the current opening degree of the indoor unit expansion valve and acquiring the supercooling degree of the outlet of the indoor unit heat exchanger;
s632 calculates the medium pressure according to the following formula:
Pm＝(Ph*Ps)^(1/2)；
Pmdenotes medium pressure, PhDenotes the first compressor 1 discharge pressure, PsRepresenting the second compressor 2 inlet pressure;
s633, according to the refrigerant physical property table, determining a first refrigerant density corresponding to the medium pressure and a second refrigerant density corresponding to the air inlet pressure of the second compressor 2;
specifically, the first refrigerant density and the second refrigerant density are both related to the ambient temperature T and the pressure P, the first refrigerant density corresponds to a vapor density, and the second refrigerant density corresponds to a liquid density. Specifically, the look-up can be performed according to a refrigerant physical property table.
The following is a part of refrigerant physical property table of R32 type refrigerant:
temperature T (. degree. C.) Pressure P (mpa) Liquid density (Kg/m)3) Steam Density (Kg/m)3)
-35 0.22138 1165.3 6.2476
-20 0.40575 1120.6 11.157
-5 0.69058 1072.2 18.769
5 0.95145 1037.7 25.891
20 1.4746 981.38 40.856
35 2.1898 917.05 63.343
The following is a part of refrigerant physical property table of R410A type refrigerant:
Figure BDA0003488779300000161
Figure BDA0003488779300000171
s634 calculates the operating frequency of the second compressor 2 at the next time according to the following formula:
Hzs(t+1)＝Hzs(t+1)*(ρm/ρs)/(1+α)；
Hzs(t+1)represents the operating frequency, p, of the second compressor 2 at the next moment in timehDenotes the first refrigerant density, rhosExpressing the density of the second refrigerant, wherein alpha represents the injection enthalpy circulation volume ratio, and the value of alpha is 0.15-0.30;
s635 controls the next moment of the second compressor 2 to be Hzs(t+1)The frequency of (2) is running;
s636 calculates the frequency adjustment value of the first compressor 1 according to the following formula:
△Hzh＝fx(Pg-Ph)；
△Hzhindicating the frequency adjustment value, P, of the first compressor 1gRepresenting the target pressure, PhRepresents the discharge port pressure of the first compressor 1;
s638 calculates the operating frequency of the first compressor 1 at the next time according to the following formula:
Hzh(t+1)＝Hzh(t)+△Hz；
Hzh(t+1)represents the operating frequency, H, of the first compressor 1 at the next moment in timezh(t)Represents the operating frequency of the first compressor 1 at this moment;
s639 controls the first compressor 1 downAt a moment with Hzh(t+1)The frequency of (2) is running;
s6310 calculates an adjustment value of the opening degree of the outdoor unit expansion valve 15 according to the following formula:
△Pls＝gx(SHG–SH)；
Δ Pls represents an opening degree adjustment value of the outdoor unit expansion valve 15, SHG represents a target superheat degree, and SH represents an outlet superheat degree of the outdoor unit heat exchanger 14;
s6311, calculating the opening degree of the outdoor unit expansion valve 15 at the next time according to the following formula;
Pls(t+1)＝Pls(t)+△Pls；
Pls(t+1)the opening degree, P, of the outdoor unit expansion valve 15 at the next timels(t)The opening degree of the outdoor unit expansion valve 15 at the present time;
s6312 control the next time of the outdoor unit expansion valve 15 to Pls(t+1)Opening operation;
s6313 calculates an adjustment value of the opening degree of the indoor unit expansion valve 20 according to the following formula:
△Plsc＝Kx(ScG–Sc)；
Δ Plsc represents an opening degree adjustment value of the indoor unit expansion valve 20, ScG represents a target supercooling degree, and SH represents an outlet supercooling degree of the outdoor unit heat exchanger 14;
s6314, calculating the opening degree of the indoor unit expansion valve 20 at the next time according to the following formula;
Plsc(t+1)＝Plsc(t)+△Plsc；
Plsc(t+1)opening degree, P, of the indoor unit expansion valve 20 at the next timelsc(t)An opening degree of the indoor unit expansion valve 20 at the current time;
s6315 controls the indoor unit expansion valve 20 to operate at Pls (t +1) opening at the next time.
In the present embodiment, the step of configuring the operation parameters of the second operation state of the air conditioner 100 further includes:
s6316 calculates an adjustment value of the opening degree of the auxiliary heat exchange expansion valve 172 according to the following formula:
△Plsf＝gx(SHf–Sf)；
△Plsfindicates the opening adjustment value, S, of the auxiliary heat exchange expansion valve 172HfIndicates the target degree of superheat, SfIndicating the degree of superheat at the outlet of the heat-assisted heater;
s6317 calculates the opening degree of the auxiliary heat exchange expansion valve 172 at the next time according to the following formula;
Plsf(t+1)＝Plsf(t)+△Plsf；
Plsf(t+1)opening degree, P, of the auxiliary heat exchange expansion valve 172 at the next timelsf(t)An opening degree of the auxiliary heat exchange expansion valve 172 at the present time;
s6318 controls the next time of opening of the auxiliary heat exchange expansion valve 172 to Pls(t+1)And (4) opening operation.
This application is through when the second running state, through adjusting the operating parameter to air conditioner 100 to can let air conditioner 100's running state and operating parameter match more, let air conditioner 100's the operation effect of heating better.
In the present embodiment, the step of controlling the air conditioner 100 to operate in the second operation state further includes:
s6319 determines whether the air conditioner 100 has received the heating operation stop instruction;
s6319 controls the air conditioner 100 to stop the heating operation when the air conditioner 100 receives the heating operation stop instruction;
if the air conditioner 100 does not receive the heating operation stop instruction, the above steps S631 to S6318 are repeated, and the above steps S631 to S6317 are performed simultaneously.
Referring to fig. 10, in the present embodiment, the step of configuring the operation parameters of the third operation state of the air conditioner 100 includes:
s641 acquires the pressures of the exhaust ports of the first compressor 1 and the second compressor 2, the operating frequencies of the first compressor 1 and the second compressor 2, the degree of superheat at the outlet of the outdoor unit heat exchanger 14, the opening degree of the outdoor unit expansion valve 15 at the current time, the current opening degree of the indoor unit expansion valve, and the degree of subcooling at the outlet of the indoor unit heat exchanger;
s642 calculates the frequency adjustment values of the first compressor 1 and the second compressor 2 according to the following formula:
△Hz＝fx(Pg-Ph)；
Δ Hz represents a frequency adjustment value of the first compressor 1 and the second compressor 2, Pg represents a target pressure, and Ph represents a discharge port pressure of the first compressor 1 or a discharge port pressure of the second compressor 2;
s643 calculates the operating frequency of the first compressor 1 and the second compressor 2 at the next time according to the following formula:
Hz(t+1)＝Hz(t)+△Hz；
Hz(t+1)represents the operating frequency, Hz, of the first compressor 1 and the second compressor 2 at the next moment in time(t)Represents the operating frequency of the first compressor 1 and the second compressor 2 at the present moment;
s644 controls the first compressor 1 and the second compressor 2 to work at Hz next moment(t+1)Frequency operation;
s645 calculates an opening degree adjustment value of the outdoor unit expansion valve 15 according to the following equation:
△Pls＝gx(SHG–SH)；
△Plsindicates the opening degree adjustment value S of the outdoor unit expansion valve 15HGIndicates the target degree of superheat, SHIndicating the degree of superheat at the outlet of the outdoor heat exchanger 14;
s646, calculating an opening degree of the outdoor unit expansion valve 15 at the next time according to the following formula;
Pls(t+1)＝Pls(t)+△Pls；
Pls(t+1)the opening degree, P, of the outdoor unit expansion valve 15 at the next timels(t)The opening degree of the outdoor unit expansion valve 15 at the present time;
s647 controls the outdoor unit expansion valve 15 to operate at the next time point Pls(t+1)Opening operation;
s648 calculates an adjustment value of the opening degree of the indoor unit expansion valve 20 according to the following formula:
△Plsc＝kx(ScG–Sc)；
Δ Plsc represents an opening degree adjustment value of the indoor unit expansion valve 20, ScG represents a target supercooling degree, and SH represents an outlet supercooling degree of the outdoor unit heat exchanger 14;
s649, calculating the opening degree of the indoor expansion valve 20 at the next time according to the following formula:
Plsc(t+1)＝Plsc(t)+△Plsc；
Plsc(t+1)opening degree, P, of indoor unit expansion valve 20 at the next timelsc(t)An opening degree of the indoor unit expansion valve 20 indicating the current time;
s6410 controlling the next time of the indoor expansion valve 20 to be Pls(t+1)And (4) opening operation.
In the present embodiment, the step of controlling the air conditioner 100 to operate in the third operation state includes:
s6411 determines whether the air conditioner 100 receives the heating operation stop instruction;
s6412 controls the air conditioner 100 to stop the heating operation when the air conditioner 100 receives the heating operation stop instruction, and loops the above steps S641 to S6410 when the air conditioner 100 does not receive the heating operation stop instruction, and the above steps S641 to S6410 are performed simultaneously.
This application is through when the third running state, through adjusting the operating parameter to air conditioner 100 to can let air conditioner 100's running state and operating parameter match more, let air conditioner 100's the operation effect of heating better.
Referring to fig. 5, 11 and 12, in the present embodiment, when the air conditioner 100 receives a cooling instruction, the control method includes:
s101, controlling a first interface and a second interface of a four-way valve 11 to be communicated;
s102, controlling the first valve body 4 to be opened, the second valve body 5 to be closed and the outdoor unit expansion valve 15 to be fully opened;
s103, configuring refrigeration operation parameters;
s104 controls the air conditioner 100 to perform cooling operation.
When the air conditioner 100 receives a refrigeration instruction, the first valve body 4 is controlled to be opened and the second valve body 5 is controlled to be closed, so that the first compressor 1 and the second compressor 2 are connected in series, and the refrigeration effect of the air conditioner 100 is better.
In an embodiment, the step of configuring the cooling operation parameter includes:
s1031 acquiring current time air inlet pressures of the first compressor 1 and the second compressor 2 and current time operating frequencies of the first compressor 1 and the second compressor 2;
s1032 calculates the frequency adjustment values of the first and second compressors 1 and 2 according to the following formulas:
△Hz＝fx(Pg-Ps)；
Δ Hz denotes the frequency adjustment of the first compressor 1 and the second compressor 2, PgRepresenting the target pressure, PsRepresents the inlet pressure of the first compressor 1 or the inlet pressure of the second compressor 2;
s1033 calculates the operating frequencies of the first compressor 1 and the second compressor 2 at the next time according to the following formulas: hz(t+1)＝Hz(t)+△Hz；
Hz(t+1)Representing the operating frequency, Hz, of the first compressor 1 and the second compressor 2 at the next moment in time(t)Represents the operating frequency of the first compressor 1 and the second compressor 2 at the present moment;
s1034 controls the first compressor 1 and the second compressor 2 to work at Hz at the next moment(t+1)The frequency is run.
S1035 calculates an adjustment value of the opening degree of the indoor expansion valve 20 according to the following formula:
△Plsc＝gx(ShG–Sc)；
△Plscindicates the opening degree adjustment value S of the indoor unit expansion valve 20cGIndicates the target degree of subcooling, ScRepresents the degree of supercooling of the outlet of the outdoor heat exchanger 14;
s1036 calculating an opening degree of the indoor unit expansion valve 20 at the next time according to the following formula;
Plsc(t+1)＝Plsc(t)+△Plsc；
Plsc(t+1)is shown belowOpening degree P of indoor unit expansion valve 20 at a momentlsc(t)An opening degree of the indoor unit expansion valve 20 indicating the current time;
s1037 control the next time of the indoor expansion valve 20 to be Pls(t+1)And (4) opening operation.
According to the method and the device, the parameters of the air conditioner 100 during refrigeration operation are configured, so that the operation parameters and the operation conditions of the air conditioner 100 during refrigeration operation are matched, and the refrigeration effect of the air conditioner 100 is better.
In this embodiment, the step of controlling the air conditioner 100 to perform the cooling operation includes:
s1041, determining whether the air conditioner 100 receives a cooling operation stop instruction;
s1042 controls the air conditioner 100 to stop the heating operation when the air conditioner 100 receives the cooling operation stop instruction, and loops the above steps S631 to S6317 when the air conditioner 100 does not receive the cooling operation stop instruction, and the above steps S1031 to S1037 are performed simultaneously.
The working principle and the beneficial effects of the air conditioner 100 and the control method of the air conditioner 100 provided by the embodiment of the invention comprise that:
this application is through establishing ties first compressor 1 and second compressor 2, and communicate the gas vent and the air inlet of second compressor 2 through first pipeline 3, thereby have first refrigerant circulation flow path and the second refrigerant circulation flow path of concurrent operation when the air ware heats the start-up, the air inlet of second compressor 2 in the first refrigerant circulation flow path, the gas vent and the 3 closed loop intercommunications of first pipeline of second compressor 2, the air inlet of second compressor 2 in the second refrigerant circulation flow path, the gas vent of second compressor 2, first compressor 1 air inlet, first compressor 1 gas vent, indoor set heat exchanger 16 closed loop intercommunication. Therefore, the second refrigerant circulation flow path can maintain the normal heating cycle of the indoor unit. Meanwhile, the refrigerant compressed by the second compressor 2 is introduced into the second compressor 2 through the first pipeline 3 by using the first refrigerant circulation flow path, so that the temperature of the refrigerant at the air inlet of the second compressor 2 can be increased, the temperature of the refrigerant in the refrigerant loop is increased, and the starting time of the air conditioner 100 during heating starting can be shortened.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (17)

1. An air conditioner, characterized in that the air conditioner (100) comprises a first compressor (1), a second compressor (2) and a first duct (3);
the discharge outlet of the second compressor (2) communicates with the intake of the first compressor (1), and the discharge outlet of the second compressor (2) communicates with the intake of the second compressor (2) through the first conduit (3);
the air outlet of the first compressor (1) and the air inlet of the second compressor (2) are used for being connected with an indoor unit heat exchanger (16);
the air conditioner (100) is provided with a first refrigerant circulating flow path and a second refrigerant circulating flow path which run simultaneously in the running state, the air inlet of the second compressor (2), the air outlet of the second compressor (2) and the first pipeline (3) in the first refrigerant circulating flow path are communicated in a closed loop mode, and the air inlet of the second compressor (2), the air outlet of the second compressor (2), the air inlet of the first compressor (1), the air outlet of the first compressor (1) and the heat exchanger (16) of the indoor unit in the second refrigerant circulating flow path are communicated in a closed loop mode.
2. The air conditioner according to claim 1, wherein the air conditioner (100) further comprises a first valve body (4), the first valve body (4) is arranged on the first pipeline (3), and the first valve body (4) is used for controlling the on-off of the first pipeline (3);
the air conditioner (100) has a first operation state in which the first valve body (4) is opened, and the first refrigerant circulation flow path and the second refrigerant circulation flow path operate simultaneously in the first operation state;
the air conditioner (100) is also provided with a second operation state that the first valve body (4) is closed, and in the second operation state, the air inlet of the second compressor (2), the air outlet of the second compressor (2), the air inlet of the first compressor (1), the air outlet of the first compressor (1) and the indoor unit heat exchanger are communicated in a closed loop mode.
3. The air conditioner according to claim 2, wherein the air conditioner (100) further comprises a second valve body (5), a second duct (6), a third duct (7) and a fourth duct (8);
the air inlet of the first compressor (1) is communicated with the air inlet of the second compressor (2) through the second pipeline (6); the exhaust port of the second compressor (2) is communicated with the exhaust port of the first compressor (1) through the third pipeline (7);
the exhaust port of the second compressor (2) is communicated with the intake port of the first compressor (1) through the fourth pipeline (8);
the second valve body (5) is arranged on the fourth pipeline (8), and the second valve body (5) is used for controlling the on-off of the fourth pipeline (8);
the air conditioner (100) further has a third operating state in which the first valve body (4) is closed and the second valve body (5) is opened or closed, and in the third operating state, the first compressor (1) and the second compressor (2) are connected in parallel to the indoor unit heat exchanger (16).
4. The air conditioner according to claim 3, wherein one end of the second pipe (6) is connected with an air inlet of the first compressor (1), the other end of the second pipe (6) is connected with one end of the first pipe (3), the other end of the first pipe (3) is connected with an air inlet of the second compressor (2), one end of the fourth pipe (8) is connected with an air outlet of the second compressor (2), and the other end of the fourth pipe (8) is connected with the second pipe (6); the first pipeline (3) and the third pipeline (7) are used for being communicated with the indoor unit heat exchanger (16);
in the first operation state of the air conditioner (100), the first valve body (4) and the second valve body (5) are both in an open state, the air inlet of the second compressor (2), the air outlet of the second compressor (2), the fourth pipeline (8) and the first pipeline (3) are communicated in a closed loop manner to form a first refrigerant circulation flow path, and the air inlet of the second compressor (2), the air outlet of the second compressor (2), the fourth pipeline (8), the second pipeline (6), the air inlet of the first compressor (1), the air outlet of the first compressor (1), the third pipeline (7), the indoor unit heat exchanger and the first pipeline (3) are communicated in a closed loop manner to form a second refrigerant circulation flow path;
in the second operation state of the air conditioner (100), the first valve body (4) is in a closed state, the second valve body (5) is in an open state, and an air inlet of the second compressor (2), an air outlet of the second compressor (2), the fourth pipeline (8), the second pipeline (6), an air inlet of the first compressor (1), an air outlet of the first compressor (1), the third pipeline (7), the indoor heat exchanger and the first pipeline (3) are communicated in a closed loop manner to form a refrigerant circulation flow path;
in a third operation state of the air conditioner (100), the first valve body (4) is in an open state, the second valve body (5) is in a closed state, and the first compressor (1) and the second compressor (2) are connected in parallel.
5. The air conditioner according to claim 4, wherein the air conditioner (100) further comprises a counter flow valve (9), the counter flow valve (9) is disposed on the first pipeline (3), the counter flow valve (9) is configured to limit a flow rate of the refrigerant in the first operating state, so that a portion of the refrigerant discharged from the discharge port of the second compressor (2) flows to the discharge port of the first compressor (1), and another portion of the refrigerant flows to the intake port of the second compressor (2), and the counter flow valve (9) is further configured to conduct the first pipeline (3) in the third operating state, so that a portion of the refrigerant flows to the intake port of the first compressor (1).
6. The air conditioner according to claim 4, wherein the air conditioner (100) further comprises a check valve (10), the check valve (10) being mounted to the third duct (7), the check valve (10) being configured to block the third duct (7) in the first and second operating states, the check valve (10) being further configured to allow the third duct (7) to conduct in the third operating state.
7. The air conditioner according to any one of claims 4 to 6, wherein the air conditioner (100) further comprises a four-way valve (11), a fifth pipe (12), a sixth pipe (13), an outdoor heat exchanger (14), an outdoor expansion valve (15), and an indoor heat exchanger (16);
one end of the fifth pipeline (12) is connected with the third pipeline (7) so that the refrigerant flowing out of the exhaust port of the first compressor (1) and/or the refrigerant flowing out of the exhaust port of the second compressor (2) can flow into the fifth pipeline (12), the other end of the fifth pipeline (12) is communicated with the first interface of the four-way valve (11), one end of the sixth pipeline (13) is connected with the first pipeline (3), the other end of the sixth pipeline is communicated with the third interface of the four-way valve (11), one end of the outdoor unit heat exchanger (14) is communicated with the second interface of the four-way valve (11), the other end of the outdoor unit heat exchanger is communicated with the outdoor unit expansion valve (15), one end of the indoor unit heat exchanger (16) is communicated with the outdoor unit expansion valve (15), and the other end of the indoor unit heat exchanger is communicated with the fourth interface of the four-way valve (11).
8. The air conditioner according to claim 7, wherein the air conditioner (100) further comprises an auxiliary heat exchange assembly (17), a third valve body (18) and a seventh pipe (19), the auxiliary heat exchange assembly (17) is connected between the outdoor expansion valve (15) and the indoor heat exchanger (16), the auxiliary heat exchange assembly (17) is communicated with the fourth pipe (8), one end of the seventh pipe (19) is connected with the fourth pipe (8), the other end of the seventh pipe is connected with the first pipe (3), the third valve body (18) is arranged on the seventh pipe (19), and the third valve body (18) is used for controlling the on-off of the seventh pipe (19);
in the third operating state, the first valve body (4) is in an open state, the second valve body (5) is in a closed state, the third valve body (18) is in an open state, and the auxiliary heat exchange assembly (17) can convey the heat-exchanged refrigerant to the air inlet of the first compressor (1) and the air inlet of the second compressor (2).
9. An air conditioner control method, applied to the air conditioner (100) of claim 7, the control method comprising:
acquiring the outdoor environment temperature;
judging whether the outdoor environment temperature is lower than a preset outdoor environment temperature or not under the condition of receiving a heating instruction; and if the outdoor environment temperature is lower than the preset outdoor environment temperature, configuring starting operation parameters of the air conditioner (100), controlling the first valve body (4) and the second valve body (5) to be opened, controlling the first interface and the fourth interface of the four-way valve (11) to be communicated, and controlling the air conditioner (100) to operate according to the first operation state.
10. The air conditioner controlling method according to claim 9, wherein the step of configuring the start-up operation parameters of the air conditioner (100) comprises:
controlling the starting frequency of the first compressor (1) to be one half of the rated starting frequency of the first compressor (1);
controlling the starting frequency of the second compressor (2) to be twice the starting frequency of the first compressor (1); and controlling the opening degree of the outdoor unit expansion valve (15) to be the lowest opening degree.
11. The air conditioner control method according to claim 9, wherein after the step of controlling the air conditioner (100) to operate in the first operation state, the control method further comprises:
acquiring the superheat degree of the exhaust port of the second compressor (2) and the superheat degree of the air inlet of the first compressor (1);
and if the superheat degree of the exhaust port of the first compressor (1) is larger than the preset exhaust heat degree and the superheat degree of the air inlet of the second compressor (2) is larger than the preset suction superheat degree, controlling the air conditioner (100) to perform heating operation in the second operation state or the third operation state.
12. The air conditioner control method according to claim 11, wherein the step of controlling the air conditioner (100) to perform a heating operation in the second operation state or the third operation state includes:
-obtaining low pressure values of the first compressor (1) and the second compressor (2), and/or obtaining compression ratios of the first compressor (1) and the second compressor (2);
if the low pressure value of the first compressor (1) and the low pressure value of the second compressor (2) are smaller than a preset low pressure value or the compression ratio of the first compressor (1) and the second compressor (2) is larger than a preset compression ratio, the first valve body (4) is controlled to be closed and the second valve body (5) is controlled to be opened, the operation parameters of the air conditioner (100) in the second operation state are configured, and the air conditioner (100) is controlled to operate in the second operation state.
13. The air conditioner control method according to claim 12, wherein the step of controlling the air conditioner (100) to perform a heating operation in the second operation state or the third operation state further comprises:
and if the low pressure value of the first compressor (1) and the second compressor (2) is larger than a preset low pressure value or the compression ratio of the first compressor (1) and the second compressor (2) is smaller than a preset compression ratio, controlling the first valve body (4) to be opened and the second valve body (5) to be closed, configuring the operation parameters of the air conditioner (100) in the third operation state, and controlling the air conditioner (100) to operate in the third operation state.
14. The air conditioner control method according to claim 12, wherein the air conditioner (100) further comprises an indoor expansion valve (20) and an indoor heat exchanger (16), the indoor expansion valve (20) being connected in series between the indoor heat exchanger and the outdoor expansion valve (15);
the step of configuring the operating parameters of the second operating state of the air conditioner (100) comprises:
acquiring the pressure of an air inlet of the second compressor (2) at the current moment, acquiring the pressure of an air outlet of the first compressor (1) at the current moment, acquiring the superheat degree of an outlet of the outdoor unit heat exchanger (14) at the current moment, acquiring the opening degree of an outdoor unit expansion valve (15) at the current moment, acquiring the current opening degree of the indoor unit expansion valve and acquiring the supercooling degree of the outlet of the indoor unit heat exchanger;
the medium pressure is calculated according to the following formula:
Pm＝(Ph*Ps)^(1/2)；
Pmdenotes medium pressure, PhRepresents the discharge port pressure, P, of the first compressor (1)sRepresenting the second compressor (2) inlet pressure;
according to a refrigerant physical property table, determining a first refrigerant density corresponding to the medium pressure and a second refrigerant density corresponding to the air inlet pressure of the second compressor (2);
the operating frequency of the second compressor (2) at the next moment is calculated according to the following formula:
Hzs(t+1)＝Hzs(t+1)*(ρm/ρs)/(1+α)；
Hzs(t+1)represents the operating frequency, rho, of the second compressor (2) at the next moment in timehDenotes the first refrigerant density, rhosExpressing the density of the second refrigerant, wherein alpha represents the injection enthalpy circulation volume ratio, and the value of alpha is 0.15-0.30;
controlling the second compressor (2) at the next moment in Hzs(t+1)The frequency of (2) is running;
calculating a frequency adjustment value of the first compressor (1) according to the following formula:
△Hzh＝fx(Pg-Ph)；
△Hzhrepresents a frequency adjustment value, P, of the first compressor (1)gRepresenting the target pressure, PhRepresents the discharge port pressure of the first compressor (1);
-calculating the operating frequency of the first compressor (1) at the next moment in time according to the following formula:
△Hz＝fx(Pg-Ph)；
Δ Hz represents a frequency adjustment value, Pg represents a target pressure, and Ph represents a discharge port pressure of the first compressor (1) or a discharge port pressure of the second compressor (2);
calculating the operating frequency of the first compressor (1) at the next moment according to the following formula:
Hzh(t+1)＝Hzh(t)+△Hz；
Hzh(t+1)representing the operating frequency, Hz, of the first compressor (1) at the next momenth(t)Represents the operating frequency of the first compressor (1) at the present moment;
controlling the first compressor (1) at the next moment in Hzh(t+1)The frequency of (2) is running;
the adjustment value of the opening degree of the outdoor unit expansion valve (15) is calculated according to the following formula:
△Pls＝gx(SHG–SH)；
△Plsindicates the opening degree adjustment value S of the outdoor unit expansion valve (15)HGIndicates the target degree of superheat, SHRepresents the degree of superheat at the outlet of the outdoor heat exchanger (14);
calculating the opening degree of the outdoor unit expansion valve (15) at the next moment according to the following formula;
Pls(t+1)＝Pls(t)+△Pls；
Pls(t+1)the opening degree P of the outdoor unit expansion valve (15) at the next timels(t)An opening degree of the outdoor unit expansion valve (15) indicating a current time;
controlling the next time of the outdoor unit expansion valve (15) to be Pls(t+1)Opening operation;
calculating the adjustment value of the opening degree of the expansion valve (20) of the indoor unit according to the following formula:
△Plsc＝kx(ScG–Sc)；
△Plscindicating the opening degree adjustment of the indoor unit expansion valve (20)Value, ScGIndicates the target degree of subcooling, ScRepresents the degree of supercooling of an outlet of an outdoor heat exchanger (14);
calculating the opening degree of the indoor unit expansion valve (20) at the next moment according to the following formula;
Plsc(t+1)＝Plsc(t)+△Plsc；
Plsc(t+1)indicates the opening degree, P, of the indoor unit expansion valve (20) at the next timelsc(t)An opening degree of the indoor unit expansion valve (20) indicating a current time;
controlling the next time of the indoor unit expansion valve (20) to be Pls(t+1)And (4) opening operation.
15. The air conditioner control method according to claim 12, wherein the air conditioner (100) further comprises an indoor expansion valve (20), the indoor expansion valve (20) being connected in series between the indoor heat exchanger (16) and the outdoor expansion valve (15);
the step of configuring the operating parameters of the third operating state of the air conditioner (100) comprises:
acquiring the exhaust port pressures of the first compressor (1) and the second compressor (2), the operating frequencies of the first compressor (1) and the second compressor (2), the superheat degree of an outlet of the outdoor unit heat exchanger (14), the opening degree of the outdoor unit expansion valve (15) at the current moment, the current opening degree of the indoor unit expansion valve (20) and the supercooling degree of the outlet of the indoor unit heat exchanger at the current moment;
calculating a frequency adjustment value for the first compressor (1) and the second compressor (2) according to the following formula:
△Hz＝fx(Pg-Ph)；
delta Hz represents the frequency adjustment of the first compressor (1) and the second compressor (2), PgRepresenting the target pressure, PhRepresents the discharge port pressure of the first compressor (1) or the discharge port pressure of the second compressor (2); calculating the operating frequency of the first compressor (1) and the second compressor (2) at the next moment according to the following formula: hz(t+1)＝Hz(t)+△Hz；
Hz(t+1)Represents the operating frequency, Hz, of the first compressor (1) and the second compressor (2) at the next moment(t)Representing the operating frequency of the first compressor (1) and the second compressor (2) at the current moment;
controlling the first compressor (1) and the second compressor (2) at the next moment in Hz(t+1)Frequency operation; the adjustment value of the opening degree of the outdoor unit expansion valve (15) is calculated according to the following formula:
△Pls＝gx(SHG–SH)；
△Plsindicates the opening degree adjustment value S of the outdoor unit expansion valve (15)HGIndicates the target degree of superheat, SHRepresents the degree of superheat at the outlet of the outdoor heat exchanger (14);
calculating the opening degree of the outdoor unit expansion valve (15) at the next moment according to the following formula;
Pls(t+1)＝Pls(t)+△Pls；
Pls(t+1)represents the opening degree of the outdoor unit expansion valve (15) at the next time, and pls (t) represents the opening degree of the outdoor unit expansion valve (15) at the current time;
controlling the next time of the outdoor unit expansion valve (15) to be Pls(t+1)Opening operation;
calculating the adjustment value of the opening degree of the expansion valve (20) of the indoor unit according to the following formula:
△Plsc＝kx(ScG–Sc)；
△Plscindicates the opening degree adjustment value S of the expansion valve (20) of the indoor unitcGIndicates the target degree of subcooling, SHRepresents the degree of supercooling of the outlet of the outdoor heat exchanger (14);
calculating the opening degree of the indoor unit expansion valve (20) at the next moment according to the following formula;
Plsc(t+1)＝Plsc(t)+△Plsc；
Plsc(t+1)indicates the opening degree, P, of the indoor unit expansion valve (20) at the next timelsc(t)The indoor unit expansion valve (20) is opened at the current timeDegree;
controlling the next time of the indoor unit expansion valve (20) to be Pls(t+1)And (4) opening operation.
16. The air conditioner control method according to claim 9, wherein when the air conditioner (100) receives a cooling command, the control method comprises:
controlling a first interface and a second interface of the four-way valve (11) to be communicated;
the first valve body (4) is opened and the second valve body (5) is closed;
configuring refrigeration operation parameters;
the air conditioner (100) is controlled to perform cooling operation.
17. The air conditioner controlling method as claimed in claim 16, wherein the step of configuring the cooling operation parameter includes:
acquiring the air inlet pressures of the first compressor (1) and the second compressor (2) at the current moment and the current-moment operating frequencies of the first compressor (1) and the second compressor (2);
calculating a frequency adjustment value for the first compressor (1) and the second compressor (2) according to the following formula:
△Hz＝fx(Pg-Ps)；
delta Hz represents the frequency adjustment of the first compressor (1) and the second compressor (2), PgRepresenting the target pressure, PsRepresents the inlet pressure of the first compressor (1) or the inlet pressure of the second compressor (2);
calculating the operating frequency of the first compressor (1) and the second compressor (2) at the next moment according to the following formula:
Hz(t+1)＝Hz(t)+△Hz；
Hz(t+1)represents the operating frequency, Hz, of the first compressor (1) and the second compressor (2) at the next moment(t)Representing the operating frequency of the first compressor (1) and the second compressor (2) at the current moment;
control stationThe first compressor (1) and the second compressor (2) are operated in Hz at the next moment(t+1)The frequency is run.
CN202210089907.4A 2022-01-25 2022-01-25 Air conditioner and control method thereof Active CN114484618B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210089907.4A CN114484618B (en) 2022-01-25 2022-01-25 Air conditioner and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210089907.4A CN114484618B (en) 2022-01-25 2022-01-25 Air conditioner and control method thereof

Publications (2)

Publication Number Publication Date
CN114484618A true CN114484618A (en) 2022-05-13
CN114484618B CN114484618B (en) 2023-10-24

Family

ID=81474462

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210089907.4A Active CN114484618B (en) 2022-01-25 2022-01-25 Air conditioner and control method thereof

Country Status (1)

Country Link
CN (1) CN114484618B (en)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005257203A (en) * 2004-03-12 2005-09-22 Tgk Co Ltd Expander
JP2006029604A (en) * 2004-07-12 2006-02-02 Matsushita Electric Ind Co Ltd Air conditioner
JP2006316852A (en) * 2005-05-11 2006-11-24 Saginomiya Seisakusho Inc Pilot operated solenoid valve and heat exchange system using the same
CN2906251Y (en) * 2006-06-06 2007-05-30 浙江盾安精工集团有限公司 One-way valve for use in air conditioner
JP2007322058A (en) * 2006-05-31 2007-12-13 Fuji Koki Corp Pressure control valve
JP2010078164A (en) * 2008-09-24 2010-04-08 Fujitsu General Ltd Refrigeration and air conditioning device
CN103822401A (en) * 2014-02-13 2014-05-28 广东美的制冷设备有限公司 Air conditioner and heat exchange system thereof
JP2015048970A (en) * 2013-08-30 2015-03-16 株式会社富士通ゼネラル Heat pump device
CN104848598A (en) * 2015-05-27 2015-08-19 广东欧科空调制冷有限公司 Water source heat pump system wide in water inlet temperature range
CN108224839A (en) * 2017-12-29 2018-06-29 Tcl空调器(中山)有限公司 A kind of multi-online air-conditioning system and its control method
CN112066458A (en) * 2020-09-07 2020-12-11 珠海格力电器股份有限公司 Air conditioning unit adopting throttle valve and control method thereof
CN113513856A (en) * 2021-07-15 2021-10-19 广东纽恩泰新能源科技发展有限公司 Heat pump system and control method

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005257203A (en) * 2004-03-12 2005-09-22 Tgk Co Ltd Expander
JP2006029604A (en) * 2004-07-12 2006-02-02 Matsushita Electric Ind Co Ltd Air conditioner
JP2006316852A (en) * 2005-05-11 2006-11-24 Saginomiya Seisakusho Inc Pilot operated solenoid valve and heat exchange system using the same
JP2007322058A (en) * 2006-05-31 2007-12-13 Fuji Koki Corp Pressure control valve
CN2906251Y (en) * 2006-06-06 2007-05-30 浙江盾安精工集团有限公司 One-way valve for use in air conditioner
JP2010078164A (en) * 2008-09-24 2010-04-08 Fujitsu General Ltd Refrigeration and air conditioning device
JP2015048970A (en) * 2013-08-30 2015-03-16 株式会社富士通ゼネラル Heat pump device
CN103822401A (en) * 2014-02-13 2014-05-28 广东美的制冷设备有限公司 Air conditioner and heat exchange system thereof
CN104848598A (en) * 2015-05-27 2015-08-19 广东欧科空调制冷有限公司 Water source heat pump system wide in water inlet temperature range
CN108224839A (en) * 2017-12-29 2018-06-29 Tcl空调器(中山)有限公司 A kind of multi-online air-conditioning system and its control method
CN112066458A (en) * 2020-09-07 2020-12-11 珠海格力电器股份有限公司 Air conditioning unit adopting throttle valve and control method thereof
CN113513856A (en) * 2021-07-15 2021-10-19 广东纽恩泰新能源科技发展有限公司 Heat pump system and control method

Also Published As

Publication number Publication date
CN114484618B (en) 2023-10-24

Similar Documents

Publication Publication Date Title
CN109556210B (en) Control method of low-temperature triple heat supply pump system
CN105910357B (en) Air-conditioning system and its valve body control method
JP2013537282A (en) Volume ratio control system and method
WO2020103521A1 (en) Gas-replenishing and enthalpy-increasing system and control method therefor
US11892209B2 (en) Multi-air conditioner for heating and cooling including a shut-off valve between indoor and outdoor units and control method thereof
CN110319513A (en) A kind of fresh air conditioner system
KR100468474B1 (en) Cooling and heating system
TWI588424B (en) Heat pump air condition system and control method thereof
CN112944453B (en) Control method of three-pipe multi-split air conditioning unit
CN114484618B (en) Air conditioner and control method thereof
KR20060117755A (en) Method for controlling operation of a multi air conditioner system
CN113983579B (en) Control method of air conditioning unit
KR100788459B1 (en) Heat pump air-conditioner having function for controlling flux of refrigerant
JP6198945B2 (en) Air conditioner
CN104913435B (en) Air conditioning system, air conditioner and control method thereof
WO2017185517A1 (en) Cooling and heating air conditioner, cooling-only air conditioner, and control method for air conditioner
CN219243740U (en) Air conditioner
CN112577101A (en) Air conditioner and control method thereof
CN110173910A (en) A kind of Gas-supplying enthalpy-increasing refrigeration system and air conditioner
KR100705668B1 (en) Heat pump air-conditioner
KR100575693B1 (en) Air conditioner with sub compression loop
WO2017185516A1 (en) Control method for cooling-heating type air conditioner and control method for cooling-only type air conditioner
WO2017185513A1 (en) Cooling-heating type air conditioner, cooling-only type air conditioner, control method for air conditioner
CN213272813U (en) Air conditioning system
CN219367765U (en) Air conditioner outdoor system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20221010

Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District

Applicant after: NINGBO AUX ELECTRIC Co.,Ltd.

Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd.

Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province

Applicant before: NINGBO AUX ELECTRIC Co.,Ltd.

Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd.

GR01 Patent grant
GR01 Patent grant