CN115200179B - Air conditioning system, throttle control method and device thereof and storage medium - Google Patents

Air conditioning system, throttle control method and device thereof and storage medium Download PDF

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Publication number
CN115200179B
CN115200179B CN202210743234.XA CN202210743234A CN115200179B CN 115200179 B CN115200179 B CN 115200179B CN 202210743234 A CN202210743234 A CN 202210743234A CN 115200179 B CN115200179 B CN 115200179B
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China
Prior art keywords
temperature
compressor
throttling element
air conditioning
conditioning system
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CN202210743234.XA
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Chinese (zh)
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CN115200179A (en
Inventor
李江波
余俊贤
范志威
郑树杰
刘亚丽
陈楷
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202210743234.XA priority Critical patent/CN115200179B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • 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
    • 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
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a throttle control method and device of an air conditioning system, a two-stage compressor air conditioning system and a storage medium, wherein the method comprises the following steps: the method comprises the steps of obtaining exhaust temperature of a compressor, obtaining first heat exchange temperature of a first heat exchanger, second heat exchange temperature of a second heat exchanger and current outdoor environment temperature; controlling the first throttling element and the second throttling element to operate according to the corresponding set maximum opening; and controlling the adjusting logic of the first throttling element and the second throttling element according to the exhaust temperature of the compressor or the current outdoor environment temperature and combining the first heat exchange temperature or the second heat exchange temperature so as to start the preset reverse adjusting logic of the second throttling element under the condition that the second throttling element misses the preset forward adjusting optimal value, so that the current running state of the air conditioning system is in the preset optimal running state. According to the scheme, the reverse control logic of the secondary throttle valve in the double throttle valve is arranged, so that the running performance of the air conditioning system of the two-stage compressor is improved.

Description

Air conditioning system, throttle control method and device thereof and storage medium
Technical Field
The invention belongs to the technical field of air conditioning systems, and particularly relates to a throttle control method and device of an air conditioning system, a two-stage compressor air conditioning system and a storage medium, in particular to a method and device for realizing reverse control logic of a double-electronic expansion valve in the two-stage compressor air conditioning system, the two-stage compressor air conditioning system and the storage medium.
Background
In the two-stage compressor air conditioning system of the related art, a conventional control manner is generally used to control the opening degree of the electronic expansion valve in the two-stage compressor air conditioning system. However, the control mode only aims at whether the parameters of the two-stage compressor air conditioning system are optimal or not under a certain specific working condition, and cannot consider whether the parameters of the two-stage compressor air conditioning system are optimal or not under other working conditions; in addition, due to the air supplementing characteristic of the two-stage compressor in the two-stage compressor air conditioning system, if the optimal value is missed by the control mode aiming at the opening degree adjustment of the two-stage throttle valve (namely the two-stage electronic expansion valve) in the two-stage throttle valve (namely the two-stage electronic expansion valve), the exhaust temperature of the two-stage compressor can be reduced along with the reduction of the opening degree of the two-stage throttle valve (namely the two-stage electronic expansion valve), and the operation performance of the two-stage compressor air conditioning system is influenced.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention aims to provide a throttling control method and device of an air conditioning system, a two-stage compressor air conditioning system and a storage medium, so as to solve the problem that the running performance of the two-stage compressor air conditioning system is unavoidably influenced by using a conventional control mode to control a double throttle valve (namely a double electronic expansion valve) in the two-stage compressor air conditioning system, and only aiming at specific working conditions, whether the parameters of the two-stage compressor air conditioning system are optimal or not can not be considered for optimal adjustment under other classes; and the problem that the operation performance of the two-stage compressor air conditioning system can be influenced if the optimal value is missed by the opening adjustment of the two-stage throttle valve (namely the two-stage electronic expansion valve) in the double throttle valve (namely the two-stage electronic expansion valve) is solved, and the effect of improving the operation performance of the two-stage compressor air conditioning system is facilitated by setting the reverse control logic of the two-stage throttle valve (namely the two-stage electronic expansion valve) in the double throttle valve (namely the two-stage electronic expansion valve).
The invention provides a throttle control method of an air conditioning system, which comprises the following steps: the device comprises a compressor, a four-way valve, a first heat exchanger, a first throttling element, a gas-liquid separator, a second throttling element and a second heat exchanger; the exhaust port of the compressor is divided into two paths after passing through a first refrigerant flow path, the first heat exchanger and the first throttling element of the four-way valve: one path is communicated with the air supplementing port of the compressor, and the other path returns to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger and the second refrigerant flow path of the four-way valve; the throttle control method of the air conditioning system comprises the following steps: after the air conditioning system is started and the compressor is operated, acquiring the exhaust temperature of the compressor, acquiring the first heat exchange temperature of the first heat exchanger, acquiring the second heat exchange temperature of the second heat exchanger and acquiring the current outdoor environment temperature of the air conditioning system; controlling the first throttling element to operate according to a first set maximum opening degree, and controlling the second throttling element to operate according to a second set maximum opening degree; and controlling the adjusting logic of the first throttling element and the second throttling element according to the exhaust temperature of the compressor or the current outdoor environment temperature of the air conditioning system and combining the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger so as to start the preset reverse adjusting logic of the second throttling element in the first throttling element and the second throttling element under the condition that the second throttling element in the first throttling element and the second throttling element has missed the preset forward adjusting optimal value, so that the current running state of the air conditioning system is in the preset optimal running state.
In some embodiments, wherein if the air conditioning system is operating in a cooling mode, the secondary one of the first and second throttling elements is the second throttling element; if the air conditioning system is operated in a heating mode, the second-stage throttling element in the first throttling element and the second throttling element is the first throttling element; the discharge temperature of the compressor includes: the method comprises the steps of monitoring an initial exhaust temperature of the compressor when the compressor is started, monitoring a current exhaust temperature of the compressor after the first throttling element operates according to a first set maximum opening degree and the second throttling element operates according to a second set maximum opening degree, and monitoring a first exhaust temperature of the compressor after the opening degree of the second throttling element is reduced.
In some embodiments, in a case where the air conditioning system is operating in a cooling mode, the adjusting logic for controlling the first throttling element and the second throttling element according to the discharge temperature of the compressor or the current outdoor ambient temperature of the air conditioning system in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger comprises: controlling the opening of the first throttling element according to the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature; and controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor; and controlling the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor under the condition that the opening degree of the second throttling element is reduced.
In some embodiments, controlling the opening degree of the first throttling element according to the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature includes: determining whether a difference between a first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to a refrigeration target temperature; if the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is larger than the refrigeration target temperature, controlling the opening of the first throttling element to be reduced according to a first set opening adjustment rate until the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is smaller than or equal to the refrigeration target temperature; and/or controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor, including: if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate; if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to maintain the current value; if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening of the second throttling element to be reduced; and/or controlling the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor, comprising: if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is greater than or equal to a first set temperature, controlling the opening degree of the second throttling element to continuously decrease; and if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is smaller than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
In some embodiments, in a case where the air conditioning system is operating in a heating mode, the adjusting logic for controlling the first throttling element and the second throttling element according to the discharge temperature of the compressor or the current outdoor ambient temperature of the air conditioning system in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger comprises: controlling the opening of the second throttling element according to the difference value between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger; and controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor; and controlling the opening degree of the first throttling element according to the difference value between the initial discharge temperature of the compressor and the first discharge temperature of the compressor under the condition that the opening degree of the first throttling element is reduced.
In some embodiments, wherein controlling the opening of the second throttling element according to the difference between the current discharge temperature of the compressor and the second heat exchange temperature of the second heat exchanger comprises: determining whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to a difference between a heating target temperature and a preset value, and whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is less than or equal to a sum of the heating target temperature and the preset value; if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than the difference between the heating target temperature and the preset value or if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the sum of the heating target temperature and the preset value, controlling the second throttling element to reduce or increase according to a second set opening adjustment rate until the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the difference between the heating target temperature and the preset value and the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than or equal to the sum of the heating target temperature and the preset value; and/or controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor, including: if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to increase according to a second set opening adjusting rate; if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to maintain the current value; if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening degree of the first throttling element to be reduced; and/or controlling the opening degree of the first throttling element according to the difference value between the initial discharge temperature of the compressor and the first discharge temperature of the compressor, comprising: if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is smaller than or equal to a first set temperature, controlling the opening degree of the first throttling element to continuously decrease; and if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is greater than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
In accordance with another aspect of the present invention, there is provided a throttle control apparatus for an air conditioning system, the air conditioning system comprising: the device comprises a compressor, a four-way valve, a first heat exchanger, a first throttling element, a gas-liquid separator, a second throttling element and a second heat exchanger; the exhaust port of the compressor is divided into two paths after passing through a first refrigerant flow path, the first heat exchanger and the first throttling element of the four-way valve: one path is communicated with the air supplementing port of the compressor, and the other path returns to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger and the second refrigerant flow path of the four-way valve; the throttle control device of the air conditioning system comprises: the acquisition unit is configured to acquire the exhaust temperature of the compressor, acquire the first heat exchange temperature of the first heat exchanger, acquire the second heat exchange temperature of the second heat exchanger and acquire the current outdoor environment temperature of the air conditioning system after the air conditioning system is started and the compressor is operated; a control unit configured to control the first throttling element to operate at a first set maximum opening and to control the second throttling element to operate at a second set maximum opening; the control unit is further configured to control the adjusting logic of the first throttling element and the second throttling element according to the exhaust temperature of the compressor or the current outdoor environment temperature of the air conditioning system and in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, so as to start the preset reverse adjusting logic of the second throttling element in the first throttling element and the second throttling element under the condition that the second throttling element in the first throttling element and the second throttling element has missed the preset forward adjusting optimal value, so that the current running state of the air conditioning system is in the preset optimal running state.
In some embodiments, wherein if the air conditioning system is operating in a cooling mode, the secondary one of the first and second throttling elements is the second throttling element; if the air conditioning system is operated in a heating mode, the second-stage throttling element in the first throttling element and the second throttling element is the first throttling element; the discharge temperature of the compressor includes: the method comprises the steps of monitoring an initial exhaust temperature of the compressor when the compressor is started, monitoring a current exhaust temperature of the compressor after the first throttling element operates according to a first set maximum opening degree and the second throttling element operates according to a second set maximum opening degree, and monitoring a first exhaust temperature of the compressor after the opening degree of the second throttling element is reduced.
In some embodiments, the control unit, in a case where the air conditioning system is operated in a cooling mode, controls the adjusting logic of the first and second throttling elements according to the discharge temperature of the compressor or the current outdoor ambient temperature of the air conditioning system in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, includes: controlling the opening of the first throttling element according to the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature; and controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor; and controlling the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor under the condition that the opening degree of the second throttling element is reduced.
In some embodiments, the control unit controls the opening degree of the first throttling element according to a difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature, and includes: determining whether a difference between a first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to a refrigeration target temperature; if the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is larger than the refrigeration target temperature, controlling the opening of the first throttling element to be reduced according to a first set opening adjustment rate until the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is smaller than or equal to the refrigeration target temperature; and/or, the control unit controls the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor, and the control unit comprises: if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate; if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to maintain the current value; if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening of the second throttling element to be reduced; and/or, the control unit controls the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor, and the control unit comprises: if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is greater than or equal to a first set temperature, controlling the opening degree of the second throttling element to continuously decrease; and if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is smaller than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
In some embodiments, the control unit, in a case where the air conditioning system is operated in a heating mode, controls the adjusting logic of the first and second throttling elements according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, includes: controlling the opening of the second throttling element according to the difference value between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger; and controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor; and controlling the opening degree of the first throttling element according to the difference value between the initial discharge temperature of the compressor and the first discharge temperature of the compressor under the condition that the opening degree of the first throttling element is reduced.
In some embodiments, the control unit controls the opening degree of the second throttling element according to a difference value between the current exhaust gas temperature of the compressor and the second heat exchange temperature of the second heat exchanger, including: determining whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to a difference between a heating target temperature and a preset value, and whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is less than or equal to a sum of the heating target temperature and the preset value; if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than the difference between the heating target temperature and the preset value or if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the sum of the heating target temperature and the preset value, controlling the second throttling element to reduce or increase according to a second set opening adjustment rate until the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the difference between the heating target temperature and the preset value and the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than or equal to the sum of the heating target temperature and the preset value; and/or, the control unit controls the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor, and the control unit comprises: if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to increase according to a second set opening adjusting rate; if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to maintain the current value; if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening degree of the first throttling element to be reduced; and/or, the control unit controls the opening degree of the first throttling element according to the difference value between the initial discharge temperature of the compressor and the first discharge temperature of the compressor, and the control unit comprises: if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is smaller than or equal to a first set temperature, controlling the opening degree of the first throttling element to continuously decrease; and if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is greater than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
In accordance with another aspect of the present invention, there is provided a dual stage compressor air conditioning system comprising: the throttle control device of the air conditioning system is described above.
In accordance with the above method, a further aspect of the present invention provides a storage medium, where the storage medium includes a stored program, and when the program runs, controls a device where the storage medium is located to execute the above method for controlling throttling of an air conditioning system.
Therefore, according to the scheme of the invention, by comparing the exhaust temperature change trend in the air conditioning system of the two-stage compressor, whether the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value is judged, so that the reverse regulation logic is started in time when the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value, and the air conditioning system is always in the optimal running state, and therefore, the running performance of the air conditioning system of the two-stage compressor is favorably improved by setting the reverse control logic of the two-stage throttle valve (namely the two-stage electronic expansion valve) in the two-stage throttle valve (namely the two-stage electronic expansion valve).
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a flow chart of an embodiment of a throttle control method of an air conditioning system according to the present invention;
FIG. 2 is a flow chart of an embodiment of a control logic for controlling a first throttling element and a second throttling element in a cooling mode in a throttling control method of an air conditioning system according to the present invention;
FIG. 3 is a flow chart illustrating an embodiment of controlling the opening of a first throttling element in a cooling mode in a throttling control method of an air conditioning system according to the present invention;
FIG. 4 is a flow chart of an embodiment of the adjusting logic for controlling the first and second throttling elements in the heating mode in the throttling control method of the air conditioning system according to the present invention;
FIG. 5 is a flow chart illustrating an embodiment of controlling the opening of the second throttling element in the heating mode in the throttling control method of the air conditioning system according to the present invention;
FIG. 6 is a schematic diagram illustrating an embodiment of a throttle control apparatus for an air conditioning system according to the present invention;
FIG. 7 is a schematic diagram of one embodiment of a refrigeration circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system);
FIG. 8 is a control logic diagram of one embodiment of a refrigeration circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system);
FIG. 9 is a schematic diagram of one embodiment of a heating flow path of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system);
FIG. 10 is a control logic diagram of one embodiment of a heating circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system).
In the embodiment of the present invention, reference numerals are as follows, in combination with the accompanying drawings:
102-an acquisition unit; 104-a control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In some aspects, conventional control logic for a throttle valve (i.e., electronic expansion valve) for a single or dual stage compressor type air conditioning system may include:
step 11, after the air conditioning system of the single-stage or double-stage compressor type is started, monitoring the exhaust temperature T of the single-stage or double-stage compressor d 。
Step 12, comparing the discharge temperature T of a single-stage or double-stage compressor d And a preset temperature T Is provided with Step 13, step 14 or step 15 is selectively performed.
Step 13, if the discharge temperature T of the single-stage or double-stage compressor d > preset temperature T Is provided with The opening degree of a throttle valve (i.e., an electronic expansion valve) in an air conditioning system of a single-stage or double-stage compressor type is increased at +1 ℃;
step 14, if T Is provided with Exhaust temperature T of single-stage or double-stage compressor at minus 1 DEG C d A preset temperature T less than or equal to Is provided with And the opening degree of a throttle valve (namely an electronic expansion valve) in the air conditioning system of a single-stage or double-stage compressor type is unchanged at +1 ℃.
Step 15, discharge temperature T of single-stage or double-stage compressor d A preset temperature T less than or equal to Is provided with The opening of the throttle valve (i.e., the electronic expansion valve) is reduced in an air conditioning system of a single-stage or two-stage compressor type at-1 c.
The control mode only aims at whether the parameters of the two-stage compressor air conditioning system are optimal or not under a certain specific working condition, and whether the parameters of the two-stage compressor air conditioning system are optimal or not can not be adjusted under other working conditions; in addition, due to the air supplementing characteristic of the two-stage compressor in the two-stage compressor air conditioning system, if the optimal value is missed by the control mode aiming at the opening degree adjustment of the two-stage throttle valve (namely the two-stage electronic expansion valve) in the two-stage throttle valve (namely the two-stage electronic expansion valve), the exhaust temperature of the two-stage compressor can be reduced along with the reduction of the opening degree of the two-stage throttle valve (namely the two-stage electronic expansion valve), and the operation performance of the two-stage compressor air conditioning system is influenced.
According to an embodiment of the present invention, there is provided a throttle control method of an air conditioning system, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The air conditioning system includes: a compressor, a four-way valve, a first heat exchanger, a first throttling element, a gas-liquid separator, a second throttling element, and a second heat exchanger, wherein the first throttling element is a throttle valve 1, and the second throttling element is a throttle valve 2. The exhaust port of the compressor is divided into two paths after passing through a first refrigerant flow path, the first heat exchanger and the first throttling element of the four-way valve: one path is communicated with the air supplementing port of the compressor, and the other path returns to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger and the second refrigerant flow path of the four-way valve. Specifically, the exhaust port of the compressor is communicated to the first port of the gas-liquid separator after passing through the first valve port of the four-way valve, the second valve port of the four-way valve, the first heat exchanger and the first throttling element. And the second port of the gas-liquid separator is communicated with the gas supplementing port of the compressor. And the third port of the gas-liquid separator is communicated to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger, the third valve port of the four-way valve and the fourth valve port of the four-way valve.
The throttle control method of the air conditioning system comprises the following steps: step S110 to step S130.
At step S110, after the air conditioning system is started and the compressor is operated, the exhaust temperature of the compressor, the current condensation temperature of the condenser, the second heat exchange temperature of the second heat exchanger, and the current outdoor environment temperature of the air conditioning system are monitored in real time, the exhaust temperature of the compressor is obtained, the first heat exchange temperature of the first heat exchanger is obtained, the second heat exchange temperature of the second heat exchanger is obtained, and the current outdoor environment temperature of the air conditioning system is obtained.
At step S120, the first throttling element is controlled to operate at a first set maximum opening, and the second throttling element is controlled to operate at a second set maximum opening.
At step S130, according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system, in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, the adjusting logic of the first throttling element and the second throttling element is controlled so as to start the preset reverse adjusting logic of the second throttling element of the first throttling element and the second throttling element when the second throttling element of the first throttling element and the second throttling element has missed the preset forward adjusting optimal value, so that the current operation state of the air conditioning system is in the preset optimal operation state. Specifically, according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system, in combination with the current condensation temperature of the condenser or the current evaporation temperature of the evaporator, it is determined whether the secondary throttle element of the first throttle element and the second throttle element has missed the preset optimal value of the forward regulation logic. And if the second throttling element in the first throttling element and the second throttling element is determined to miss the preset optimal value of forward regulation, starting preset reverse regulation logic of the second throttling element in the first throttling element and the second throttling element so as to enable the current running state of the air conditioning system to be in the preset optimal running state.
According to the scheme, a novel control method of the electronic expansion valve in the two-stage compressor air conditioning system is provided, and particularly, the electronic expansion valve reverse control logic is provided, so that no cost is increased, the opening degree of the two-stage throttle valve is adjusted by comparing the exhaust temperature change trend in the two-stage compressor air conditioning system, the air conditioning system corresponding to the two-stage compressor air conditioning system always has sufficient refrigerant passing through the indoor unit, and the comfort of the indoor environment controlled by the air conditioning system is guaranteed. In this way, in the scheme of the invention, the control method of the secondary throttle valve (namely the secondary electronic expansion valve) in the double throttle valve (namely the double electronic expansion valve) is optimized, so that the double throttle valve (namely the double electronic expansion valve) is ensured to open and reversely regulate after the forward regulation optimal value is missed, and the heat exchange capacity of the air conditioning system is ensured.
In an aspect of the present invention, a dual-stage compressor air conditioning system (e.g., a dual-stage inverter air conditioning system) includes: the device comprises a compressor, a liquid storage tank, an evaporator, a condenser, a throttle valve 1, a throttle valve 2, a two-way valve, a four-way valve and a gas-liquid separator. And an exhaust port of the compressor is communicated with the first valve port of the four-way valve. The second valve port of the four-way valve is communicated with the gas-liquid separation after passing through the condenser and the throttle valve 1 A first port of the device. The second port of the gas-liquid separator is communicated to the air supplementing port of the compressor after passing through the two-way valve. The third port of the gas-liquid separator is communicated with the third valve port of the four-way valve after passing through the throttle valve 2 and the evaporator. The fourth valve port of the four-way valve is communicated to the air suction port of the compressor after passing through the liquid storage tank. The condenser is a first heat exchanger, and the evaporator is a second heat exchanger. The temperature at the inlet of the liquid storage tank is T in The coil temperature of the evaporator is T E The coil temperature of the condenser is T C 。
In the scheme of the invention, by comparing the change trend of the exhaust temperature in the air conditioning system of the two-stage compressor, whether the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value or not is judged, so that the reverse regulation logic is timely started when the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value, the reverse control can be timely started after the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value, the air conditioning system is always in the optimal running state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
And if the air conditioning system operates in a refrigeration mode, the second-stage throttling element in the first throttling element and the second throttling element is the second throttling element. And if the air conditioning system is operated in a heating mode, the second-stage throttling element in the first throttling element and the second throttling element is the first throttling element.
Wherein for the cooling mode, the secondary throttle valve (i.e. the secondary electronic expansion valve) refers to throttle valve 2. For heating mode, the secondary throttle valve (i.e., the secondary electronic expansion valve) refers to the throttle valve 1.
The discharge temperature of the compressor includes: the method comprises the steps of monitoring an initial exhaust temperature of the compressor when the compressor is started, monitoring a current exhaust temperature of the compressor after the first throttling element operates according to a first set maximum opening degree and the second throttling element operates according to a second set maximum opening degree, and monitoring a first exhaust temperature of the compressor after the opening degree of the second throttling element is reduced.
Specifically, an initial discharge temperature of the compressor, a current discharge temperature of the compressor, and a first discharge temperature of the compressor are obtained, a current condensing temperature of the condenser is obtained, a current evaporating temperature of the evaporator is obtained, and a current outdoor ambient temperature of the air conditioning system is obtained. Wherein the initial discharge temperature of the compressor, the current discharge temperature of the compressor, and the first discharge temperature of the compressor are discharge temperatures of the compressor monitored over time. For example: initial discharge temperature T of compressor d0 Current discharge temperature T of compressor d First discharge temperature T of compressor d1 The first heat exchange temperature of the first heat exchanger is the current condensing temperature T of the condenser C The second heat exchange temperature of the second heat exchanger is the current evaporating temperature T of the evaporator E Current outdoor ambient temperature T Outer ring 。
In some embodiments, in the case that the air conditioning system is operated in the cooling mode, the specific process of controlling the adjusting logic of the first and second throttling elements according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system in step S130 in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger is described as an example below.
The following is a schematic flow chart of an embodiment of the adjusting logic for controlling the first throttling element and the second throttling element in the cooling mode in the method according to the present invention in connection with fig. 2, and further describes a specific process for controlling the adjusting logic for controlling the first throttling element and the second throttling element in the cooling mode in step S130, which includes: step S210 and step S220.
Step S210, controlling the opening of the first throttling element according to the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature. And controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor.
Step S220, controlling the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor when the opening degree of the second throttling element is reduced. That is, after the opening degree of the second throttling element is controlled according to the current exhaust temperature and the preset temperature of the compressor, if the opening degree of the second throttling element is reduced, the opening degree of the second throttling element is controlled according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor when the opening degree of the second throttling element is reduced.
Fig. 7 is a schematic diagram of an embodiment of a refrigeration circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 7, in a refrigeration flow path of a two-stage compressor air conditioning system (such as a two-stage variable frequency air conditioning system), a refrigerant output from an exhaust port of a compressor passes through a first port of a four-way valve, a second port of the four-way valve, a condenser and a throttle valve 1, and then enters a gas-liquid separator through a first port of the gas-liquid separator. Then, the air is input to the air supplementing port of the compressor through the second port of the gas-liquid separator and the two-way valve, and the air is returned to the air suction port of the compressor through the third port of the gas-liquid separator, the throttle valve 2, the evaporator, the third valve port of the four-way valve, the fourth valve port of the four-way valve and the liquid storage tank. By judging whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value or not, so that the reverse regulation logic is started in time when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, the air conditioning system can be always in an optimal running state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
In some embodiments, the specific process of controlling the opening degree of the first throttling element according to the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature in step S210 is described in the following exemplary description.
The following is a schematic flow chart of an embodiment of controlling the opening of the first throttling element in the refrigeration mode in the method of the present invention in connection with fig. 3, and further describes a specific process of controlling the opening of the first throttling element in the refrigeration mode in step S210, which includes: step S310 and step S320.
Step S310, determining whether the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to a refrigeration target temperature.
Step S320, if the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is greater than the refrigeration target temperature, controlling the opening of the first throttling element to decrease according to a first set opening adjustment rate until the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to the refrigeration target temperature.
FIG. 8 is a control logic diagram of one embodiment of a refrigeration circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 8, the control logic of the refrigerating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic refrigerating mode, includes:
Step 21, after the air conditioning system is started, the compressor is started and operated, and the throttle valve 1 and the throttle valve 2 are controlled according to a preset upper limit P of opening Upper limit 1 、P Upper limit 2 Operating, i.e. throttle 1 at a preset upper limit P Upper limit 1 In operation, the throttle valve 2 is operated at a preset upper opening limit P Upper limit 2 And (5) running.
Step 22, after the air conditioning system is started, monitoring the current exhaust temperature T of the compressor in real time d Current condensing temperature T of condenser C Initial discharge temperature T of the compressor as monitored after start-up of the air conditioning system d0 Initial condensing temperature T of condenser C0 And monitors the current outdoor environment temperature T Outer ring 。
Step 23, the throttle valve 1 is operated according to the current condensing temperature T of the condenser C -current outdoor ambient temperature T Outer ring Refrigeration target temperature A less than or equal to Cold 0 If the throttle valve 1 does not meet the requirement, the throttle valve is adjusted in the opening by a first set opening adjustment rate DeltaP 1 S decreases until the requirement is met, i.e. until the throttle valve 1 is at the current condensation temperature T of the condenser C -current outdoor ambient temperature T Outer ring Refrigeration purpose less than or equal toTarget temperature A Cold 0 。
In some embodiments, in step S210, the opening degree of the second throttling element is controlled according to the current exhaust temperature and the preset temperature of the compressor, including a first control situation of the opening degree of any one of the following second throttling elements:
A first control situation of the opening degree of the first second throttling element: and if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
First control situation of opening degree of second throttle element: and if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening degree of the second throttling element to maintain the current value.
First control situation of opening degree of third second throttling element: and if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening degree of the second throttling element to be reduced.
As shown in fig. 8, the control logic of the refrigerating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic refrigerating mode, further includes:
step 24, while executing step 23, comparing the current discharge temperature T of the compressor d And a preset temperature T Is provided with 。
Step 25, if the current discharge temperature T of the compressor d > preset temperature T Is provided with +1 ℃, the opening of the throttle valve 2 is adjusted by a second set opening adjustment rate DeltaP 2 And/s increases. If the throttle valve 2 has reached the upper limit opening, the subsequent opening will remain unchanged until the throttle valve opening reduction condition is satisfied.
Step 26, if the preset temperature T Is provided with -1 ℃ < current discharge temperature T of the compressor d A preset temperature T less than or equal to Is provided with The opening degree of the throttle valve 2 is maintained constant at +1℃.
Step 27, if the current discharge temperature T of the compressor d A preset temperature T less than or equal to Is provided with -1 ℃, the opening of the throttle valve 2 is reduced, e.g. the rate Δp is adjusted according to the second set opening 2 And/s decreases.
In some embodiments, the controlling the opening degree of the second throttling element in step S220 according to the difference between the first discharge temperature of the compressor and the initial discharge temperature of the compressor includes any of the following second control conditions of the opening degree of the second throttling element:
a second control situation of the opening degree of the first second throttle element: and if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is greater than or equal to a first set temperature, controlling the opening degree of the second throttling element to continuously decrease.
Second control of the opening degree of the second throttle element: and if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is smaller than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
As shown in fig. 8, the control logic of the refrigerating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic refrigerating mode, further includes:
in step 27, the first discharge temperature T of the compressor is monitored with a decrease in the opening of the throttle valve 2 d1 . At the same time determine the initial discharge temperature T of the compressor d0 First discharge temperature T of the compressor d1 After which step 28 or step 29 is optionally performed.
Step 28, if the first discharge temperature T of the compressor d1 Initial discharge temperature T of the compressor d0 Not less than the first set temperature DeltaT 1 It is explained that the flow rate of the make-up air is appropriate at this time, the throttle valve 2 continues to be adjusted in the forward direction, that is, the opening degree of the throttle valve 2 continues to be reduced until the target exhaust gas temperature requirement is satisfied.
Step 29, if the first discharge temperature T of the compressor d1 -initial row of compressorsTemperature T of gas d0 The second set temperature delta T is less than or equal to 2 At the moment, the air supplementing flow is larger, the smaller the opening of the throttle valve is, the lower the exhaust temperature of the compressor is, the forward adjustment of the double throttle valve is failed, and the reverse adjustment of the double throttle valve is started, namely the opening of the throttle valve 2 adjusts the speed delta P according to the second set opening 2 S increases until the target discharge demand of the compressor is met or the positive adjustment logic demand of the double throttle is met.
Of course, the exhaust temperature of the compressor programmed for different air conditioning systems is different, and the exhaust temperature of the compressor in a common air conditioning system is within a reasonable range from 60 ℃ to 95 ℃. The control logic of the scheme of the invention mainly judges the change of the exhaust temperature of the compressor along with the reduction of the opening of the throttle valve 1, and if the exhaust temperature gradually rises along with the reduction of the opening of the throttle valve 1, the proper air supplementing quantity of the two-stage system compressor is indicated, and the forward regulation is satisfied.
If the exhaust temperature is gradually or rapidly reduced along with the reduction of the opening of the throttle valve 1, the condition that the air supplementing amount of the compressor of the two-stage system is larger is indicated, most of the refrigerant flow of the air conditioning system returns to the compressor through the air supplementing opening of the compressor, the refrigerant does not pass through the evaporator, the refrigeration effect is poor, at the moment, reverse regulation is required to be started, the opening of the throttle valve 1 is increased, more refrigerant flows into the evaporator to produce the refrigeration effect, and the exhaust temperature of the compressor can be also increased.
For example: for the cooling mode, the target discharge temperature of the compressor is 75 ℃ under the current outdoor ambient temperature 35 ℃. The air conditioning system is started and operated, the exhaust temperature of the compressor is detected to be 60 ℃, the exhaust temperature of the compressor is smaller than the target exhaust of the compressor, the throttle valve 1 is reduced by 3B/s, and 3B (namely 3 steps) corresponds to the first set opening adjustment rate delta P 1 . If the exhaust temperature of the compressor is increased from 60 ℃ to 75 ℃ along with the reduction of the opening of the throttle valve 1 in the process, the forward regulation is effective, and the forward regulation requirement is met.
If the exhaust temperature of the compressor increases from 60 ℃ to 70 ℃ during the process of decreasing the opening of the throttle valve 1, but after the exhaust temperature of the compressor exceeds 70 ℃, the exhaust temperature of the compressor decreases with decreasing opening of the throttle valve 1 (for example, the exhaust temperature of the compressor decreases to 50 ℃ after increasing to 70 ℃ during the process of decreasing the opening of the throttle valve 1), which means that the forward regulation cannot meet the exhaust requirement during the process of decreasing the opening of the throttle valve 1, and the reverse regulation must be started to increase the target exhaust. It also shows that the initial target exhaust temperature of the compressor is 75 ℃ which is not the optimal exhaust value of the unit, and the turning point of the exhaust temperature of the compressor is the optimal state. The reverse regulation is only applicable to a two-stage air supplementing system, and is ineffective to a non-air supplementing system.
In some embodiments, in the case that the air conditioning system is operated in the heating mode, the specific process of controlling the adjusting logic of the first and second throttling elements according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system in step S130 in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger is described as an example below.
The following is a schematic flow chart of an embodiment of the control logic for controlling the first throttling element and the second throttling element in the heating mode in the method of the present invention in connection with fig. 4, and further describes a specific process for controlling the control logic for controlling the first throttling element and the second throttling element in the heating mode in step S130, which includes: step S410 and step S420.
Step S410, controlling the opening of the second throttling element according to the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger. And controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor.
Step S420, controlling the opening degree of the first throttling element according to the difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor when the opening degree of the first throttling element is reduced. That is, after the opening of the first throttling element is controlled according to the current discharge temperature and the preset temperature of the compressor, if the opening of the first throttling element is reduced, the opening of the first throttling element is controlled according to the difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor when the opening of the first throttling element is reduced.
FIG. 9 is a schematic diagram of one embodiment of a heating flow path of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 9, in a heating flow path of a two-stage compressor air conditioning system (such as a two-stage variable frequency air conditioning system), a refrigerant output by an exhaust port of a compressor enters a gas-liquid separator through a third port of the gas-liquid separator after passing through a fourth valve port of a four-way valve, a third valve port of the four-way valve, an evaporator and a throttle valve 2. Then, the air is input to the air supplementing port of the compressor through the second port of the gas-liquid separator and the two-way valve, and the air is returned to the air suction port of the compressor through the first port of the gas-liquid separator, the throttle valve 1, the condenser, the second valve port of the four-way valve, the first valve port of the four-way valve and the liquid storage tank. By judging whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value or not, so that the reverse regulation logic is started in time when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, the air conditioning system can be always in an optimal running state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
In some embodiments, the specific process of controlling the opening degree of the second throttling element in step S410 according to the difference between the current exhaust gas temperature of the compressor and the second heat exchange temperature of the second heat exchanger is described in the following exemplary description.
The following is a schematic flow chart of an embodiment of controlling the opening of the second throttling element in the heating mode in the method of the present invention in connection with fig. 5, and further describes a specific process of controlling the opening of the second throttling element in the heating mode in step S410, which includes: step S510 and step S520.
Step S510, determining whether the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to the difference between the heating target temperature and the preset value, and whether the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is less than or equal to the sum of the heating target temperature and the preset value.
And step S520, if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than the difference between the heating target temperature and the preset value, or if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to the sum of the heating target temperature and the preset value, controlling the second throttling element to reduce or increase according to the second set opening adjustment rate until the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to the difference between the heating target temperature and the preset value, and the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is less than or equal to the sum of the heating target temperature and the preset value.
FIG. 10 is a control logic diagram of one embodiment of a heating circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 10, the control logic of the heating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic heating mode, includes:
step 31, after the air conditioning system is started, the compressor is started and operated, and the throttle valve 1 and the throttle valve 2 are controlled according to a preset upper limit P of opening Upper limit 1 、P Upper limit 2 Operating, i.e. throttle 1 at a preset upper limit P Upper limit 1 In operation, the throttle valve 2 is operated at a preset upper opening limit P Upper limit 2 And (5) running.
Step 32, after the air conditioning system is started, monitoring the current exhaust temperature T of the compressor in real time d Current evaporating temperature T of evaporator E Initial discharge temperature T of the compressor as monitored after start-up of the air conditioning system d0 Initial evaporation temperature T of evaporator E0 And monitors the current outdoor environment temperature T Outer ring 。
Step 33, throttle valve 2 is operated at current exhaust temperature T d Current evaporator temperature T E Not less than the heating target temperature B re1 Regulating, if not meeting the requirement, the throttle valve2 according to a first set opening adjustment rate DeltaP 2 S decreases until the requirement is met, i.e. until the throttle valve 1 is at the current exhaust gas temperature T d Current evaporator temperature T E Not less than the heating target temperature B re1 。
In some embodiments, in step S410, the opening degree of the first throttling element is controlled according to the current discharge temperature and the preset temperature of the compressor, including a first control situation of the opening degree of any one of the following first throttling elements:
a first control situation of the opening degree of the first throttle element: and if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to increase according to the second set opening adjusting speed.
First control situation of opening degree of second type first throttle element: and if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening degree of the first throttling element to maintain the current value.
First control situation of opening degree of third first throttling element: and if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening degree of the first throttling element to be reduced.
As shown in fig. 10, the control logic of the heating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic heating mode, further includes:
Step 34, comparing the current discharge temperature T of the compressor while executing step 33 d And a preset temperature T Is provided with 。
Step 35, if the current discharge temperature T of the compressor d > preset temperature T Is provided with The opening of the throttle valve 1 is adjusted by a second set opening adjustment rate DeltaP at +1deg.C 2 And/s increases.
Step 36, if the preset temperature T Is provided with -1 ℃ < current discharge temperature T of the compressor d A preset temperature T less than or equal to Is provided with The opening degree of the throttle valve 1 is maintained constant at +1℃.
Step 37, if the current discharge temperature T of the compressor d A preset temperature T less than or equal to Is provided with -1 ℃, the opening of the throttle valve 1 is reduced.
In some embodiments, the controlling the opening degree of the first throttling element in step S420 according to the difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor includes any of the following second control conditions of the opening degree of the first throttling element:
second control situation of opening degree of first throttle element: and if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is smaller than or equal to a first set temperature, controlling the opening degree of the first throttling element to continuously decrease.
Second control situation of opening degree of second first throttle element: and if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is greater than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
As shown in fig. 10, the control logic of the heating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic heating mode, further includes:
in step 37, the first discharge temperature T of the compressor is monitored with a decrease in the opening of the throttle valve 1 d1 . At the same time determine the initial discharge temperature T of the compressor d0 First discharge temperature T of the compressor d1 After which step 38 or step 39 is optionally performed.
Step 38, if the first discharge temperature T of the compressor d1 Initial discharge temperature T of the compressor d0 Not less than the first set temperature DeltaT 1 It is explained that the flow rate of the make-up air is appropriate at this time, the throttle valve 1 continues to be adjusted in the forward direction, that is, the opening degree of the throttle valve 1 continues to be reduced until the requirement of the target discharge temperature of the compressor is satisfied.
Step 39, if the first discharge temperature T of the compressor d1 -compressionInitial exhaust temperature T of machine d0 The second set temperature delta T is less than or equal to 2 At this time, the exhaust temperature of the compressor is lower as the opening of the throttle valve is smaller, the forward regulation of the double throttle valve is failed, and the reverse regulation of the double throttle valve is started, namely, the opening of the throttle valve 1 regulates the speed delta P according to the second set opening 2 S increases until the target discharge temperature of the compressor is met or the positive adjustment logic of the double throttle is met.
The two-stage compressor air conditioning system with the scheme is particularly suitable for a variable frequency air conditioning system. According to the scheme of the invention, through the change trend of the exhaust temperature and the difference between the condenser temperature and the outdoor environment temperature, the double throttle valves (namely the double electronic expansion valves) are jointly controlled, so that when the two-stage throttle valves (namely the two-stage electronic expansion valves) in the double throttle valves (namely the double electronic expansion valves) are in a wrong forward regulation optimal value, the reverse regulation logic is timely started, and the reverse control is timely started after the two-stage throttle valves (namely the two-stage electronic expansion valves) are in a wrong forward regulation optimal value, so that the air conditioning system is always in an optimal operation state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
By adopting the technical scheme of the embodiment, whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value or not is judged by comparing the change trend of the exhaust temperature in the air conditioning system of the two-stage compressor, so that the air conditioning system is always in the optimal running state by timely starting the reverse regulation logic when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, and the operation performance of the air conditioning system of the two-stage compressor is favorably improved by setting the reverse control logic of the secondary throttle valve (namely the secondary electronic expansion valve) in the double throttle valve (namely the double electronic expansion valve).
According to an embodiment of the present invention, there is also provided a throttle control apparatus of an air conditioning system corresponding to the throttle control method of an air conditioning system. Referring to fig. 6, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The air conditioning system includes: a compressor, a four-way valve, a first heat exchanger, a first throttling element, a gas-liquid separator, a second throttling element, and a second heat exchanger, wherein the first throttling element is a throttle valve 1, and the second throttling element is a throttle valve 2. The exhaust port of the compressor is divided into two paths after passing through a first refrigerant flow path, the first heat exchanger and the first throttling element of the four-way valve: one path is communicated with the air supplementing port of the compressor, and the other path returns to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger and the second refrigerant flow path of the four-way valve. Specifically, the exhaust port of the compressor is communicated to the first port of the gas-liquid separator after passing through the first valve port of the four-way valve, the second valve port of the four-way valve, the first heat exchanger and the first throttling element. And the second port of the gas-liquid separator is communicated with the gas supplementing port of the compressor. And the third port of the gas-liquid separator is communicated to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger, the third valve port of the four-way valve and the fourth valve port of the four-way valve.
The throttle control device of the air conditioning system comprises: an acquisition unit 102 and a control unit 104.
The acquiring unit 102 is configured to monitor, in real time, an exhaust temperature of the compressor, a current condensing temperature of the condenser, a second heat exchange temperature of the second heat exchanger, and a current outdoor environment temperature of the air conditioning system after the air conditioning system is started and the compressor is operated, acquire the exhaust temperature of the compressor, acquire the first heat exchange temperature of the first heat exchanger, acquire the second heat exchange temperature of the second heat exchanger, and acquire the current outdoor environment temperature of the air conditioning system. The specific function and process of the acquisition unit 102 refer to step S110.
A control unit 104 is configured to control the first throttling element to operate at a first set maximum opening and to control the second throttling element to operate at a second set maximum opening. The specific function and process of the control unit 104 refer to step S120.
The control unit 104 is further configured to control the adjustment logic of the first throttling element and the second throttling element according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system, and in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, so as to start the preset reverse adjustment logic of the second throttling element of the first throttling element and the second throttling element to enable the current operation state of the air conditioning system to be in the preset optimal operation state under the condition that the second throttling element of the first throttling element and the second throttling element has missed the preset forward adjustment optimal value. Specifically, according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system, in combination with the current condensation temperature of the condenser or the current evaporation temperature of the evaporator, it is determined whether the secondary throttle element of the first throttle element and the second throttle element has missed the preset optimal value of the forward regulation logic. And if the second throttling element in the first throttling element and the second throttling element is determined to miss the preset optimal value of forward regulation, starting preset reverse regulation logic of the second throttling element in the first throttling element and the second throttling element so as to enable the current running state of the air conditioning system to be in the preset optimal running state. The specific function and processing of the control unit 104 is also referred to in step S130.
According to the scheme, a novel electronic expansion valve control device in the two-stage compressor air conditioning system is provided, and particularly, the electronic expansion valve reverse control logic is provided, so that the cost is not increased, the opening degree of a two-stage throttle valve is adjusted by comparing the exhaust temperature change trend in the two-stage compressor air conditioning system, the air conditioning system corresponding to the two-stage compressor air conditioning system always has sufficient refrigerant passing through an indoor unit, and the comfort of the indoor environment controlled by the air conditioning system is ensured. In this way, in the scheme of the invention, the control device of the secondary throttle valve (namely the secondary electronic expansion valve) in the double throttle valve (namely the double electronic expansion valve) is optimized, so that the double throttle valve (namely the double electronic expansion valve) is ensured to open and reversely regulate after the forward regulation optimal value is missed, and the heat exchange capacity of the air conditioning system is ensured.
In aspects of the present invention, a dual stage compressor air conditioning system (e.g., a dual stage variable frequency air conditioning system)System), comprising: the device comprises a compressor, a liquid storage tank, an evaporator, a condenser, a throttle valve 1, a throttle valve 2, a two-way valve, a four-way valve and a gas-liquid separator. And an exhaust port of the compressor is communicated with the first valve port of the four-way valve. The second valve port of the four-way valve is communicated to the first port of the gas-liquid separator after passing through the condenser and the throttle valve 1. The second port of the gas-liquid separator is communicated to the air supplementing port of the compressor after passing through the two-way valve. The third port of the gas-liquid separator is communicated with the third valve port of the four-way valve after passing through the throttle valve 2 and the evaporator. The fourth valve port of the four-way valve is communicated to the air suction port of the compressor after passing through the liquid storage tank. The condenser is a first heat exchanger, and the evaporator is a second heat exchanger. The temperature at the inlet of the liquid storage tank is T in The coil temperature of the evaporator is T E The coil temperature of the condenser is T C 。
In the scheme of the invention, by comparing the change trend of the exhaust temperature in the air conditioning system of the two-stage compressor, whether the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value or not is judged, so that the reverse regulation logic is timely started when the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value, the reverse control can be timely started after the two-stage throttle valve (namely the two-stage electronic expansion valve) misses the forward regulation optimal value, the air conditioning system is always in the optimal running state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
And if the air conditioning system operates in a refrigeration mode, the second-stage throttling element in the first throttling element and the second throttling element is the second throttling element. And if the air conditioning system is operated in a heating mode, the second-stage throttling element in the first throttling element and the second throttling element is the first throttling element.
Wherein for the cooling mode, the secondary throttle valve (i.e. the secondary electronic expansion valve) refers to throttle valve 2. For heating mode, the secondary throttle valve (i.e., the secondary electronic expansion valve) refers to the throttle valve 1.
The discharge temperature of the compressor includes: the method comprises the steps of monitoring an initial exhaust temperature of the compressor when the compressor is started, monitoring a current exhaust temperature of the compressor after the first throttling element operates according to a first set maximum opening degree and the second throttling element operates according to a second set maximum opening degree, and monitoring a first exhaust temperature of the compressor after the opening degree of the second throttling element is reduced.
Specifically, an initial discharge temperature of the compressor, a current discharge temperature of the compressor, and a first discharge temperature of the compressor are obtained, a current condensing temperature of the condenser is obtained, a current evaporating temperature of the evaporator is obtained, and a current outdoor ambient temperature of the air conditioning system is obtained. Wherein the initial discharge temperature of the compressor, the current discharge temperature of the compressor, and the first discharge temperature of the compressor are discharge temperatures of the compressor monitored over time. For example: initial discharge temperature T of compressor d0 Current discharge temperature T of compressor d First discharge temperature T of compressor d1 The first heat exchange temperature of the first heat exchanger is the current condensing temperature T of the condenser C The second heat exchange temperature of the second heat exchanger is the current evaporating temperature T of the evaporator E Current outdoor ambient temperature T Outer ring 。
In some embodiments, the control unit 104, in a case where the air conditioning system is operated in a cooling mode, controls the adjusting logic of the first throttling element and the second throttling element according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, includes:
the control unit 104 is specifically further configured to control the opening degree of the first throttling element according to a difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature. And controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor. The specific function and process of the control unit 104 also refer to step S210.
The control unit 104 is specifically further configured to control the opening degree of the second throttling element according to a difference between the first discharge temperature of the compressor and the initial discharge temperature of the compressor, in case the opening degree of the second throttling element is reduced. That is, after the opening degree of the second throttling element is controlled according to the current exhaust temperature and the preset temperature of the compressor, if the opening degree of the second throttling element is reduced, the opening degree of the second throttling element is controlled according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor when the opening degree of the second throttling element is reduced. The specific function and process of the control unit 104 is also referred to as step S220.
Fig. 7 is a schematic diagram of an embodiment of a refrigeration circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 7, in a refrigeration flow path of a two-stage compressor air conditioning system (such as a two-stage variable frequency air conditioning system), a refrigerant output from an exhaust port of a compressor passes through a first port of a four-way valve, a second port of the four-way valve, a condenser and a throttle valve 1, and then enters a gas-liquid separator through a first port of the gas-liquid separator. Then, the air is input to the air supplementing port of the compressor through the second port of the gas-liquid separator and the two-way valve, and the air is returned to the air suction port of the compressor through the third port of the gas-liquid separator, the throttle valve 2, the evaporator, the third valve port of the four-way valve, the fourth valve port of the four-way valve and the liquid storage tank. By judging whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value or not, so that the reverse regulation logic is started in time when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, the air conditioning system can be always in an optimal running state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
In some embodiments, the control unit 104 controls the opening degree of the first throttling element according to a difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature, including:
The control unit 104 is specifically further configured to determine whether a difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to a refrigeration target temperature. The specific function and process of the control unit 104 also refer to step S310.
The control unit 104 is specifically further configured to control the opening of the first throttling element to decrease according to a first set opening adjustment rate if the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is greater than the refrigeration target temperature, until the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to the refrigeration target temperature. The specific function and process of the control unit 104 also refer to step S320.
FIG. 8 is a control logic diagram of one embodiment of a refrigeration circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 8, the control logic of the refrigerating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic refrigerating mode, includes:
step 21, after the air conditioning system is started, the compressor is started and operated, and the throttle valve 1 and the throttle valve 2 are controlled according to a preset upper limit P of opening Upper limit 1 、P Upper limit 2 Operating, i.e. throttle 1 at a preset upper limit P Upper limit 1 In operation, the throttle valve 2 is operated at a preset upper opening limit P Upper limit 2 And (5) running.
Step 22, after the air conditioning system is started, monitoring the current exhaust temperature T of the compressor in real time d Current condensing temperature T of condenser C Initial discharge temperature T of the compressor as monitored after start-up of the air conditioning system d0 Initial condensing temperature T of condenser C0 And monitors the current outdoor environment temperature T Outer ring 。
Step 23, the throttle valve 1 is operated according to the current condensing temperature T of the condenser C -current outdoor ambient temperature T Outer ring Refrigeration target temperature A less than or equal to Cold 0 If the throttle valve 1 does not meet the requirement, the throttle valve is adjusted in the opening by a first set opening adjustment rate DeltaP 1 S decreases until the requirement is met, i.e. until the throttle valve 1 is at the current condensation temperature T of the condenser C -current outdoor ambient temperature T Outer ring Refrigeration target temperature A less than or equal to Cold 0 。
In some embodiments, the control unit 104 controls the opening degree of the second throttling element according to the current discharge temperature and the preset temperature of the compressor, including a first control situation of the opening degree of any one of the following second throttling elements:
a first control situation of the opening degree of the first second throttling element: the control unit 104 is specifically further configured to control the opening degree of the second throttling element to increase according to a second set opening degree adjustment rate if the current discharge temperature of the compressor is greater than the sum of the preset temperature and the preset value.
First control situation of opening degree of second throttle element: the control unit 104 is specifically further configured to control the opening degree of the second throttling element to maintain the current value if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value.
First control situation of opening degree of third second throttling element: the control unit 104 is specifically further configured to control the opening degree of the second throttling element to decrease if the current discharge temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value.
As shown in fig. 8, the control logic of the refrigerating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic refrigerating mode, further includes:
step 24, while executing step 23, comparing the current discharge temperature T of the compressor d And a preset temperature T Is provided with 。
Step 25, if the current discharge temperature T of the compressor d > preset temperature T Is provided with +1 ℃, the opening of the throttle valve 2 is adjusted by a second set opening adjustment rate DeltaP 2 And/s increases.
Step 26, if the preset temperature T Is provided with -1 ℃ < current discharge temperature T of the compressor d A preset temperature T less than or equal to Is provided with The opening degree of the throttle valve 2 is maintained constant at +1℃.
Step 27, if the current discharge temperature T of the compressor d A preset temperature T less than or equal to Is provided with -1 ℃, the opening of the throttle valve 2 is reduced.
In some embodiments, the control unit 104 controls the opening degree of the second throttling element according to a difference between the first discharge temperature of the compressor and the initial discharge temperature of the compressor, including a second control condition of the opening degree of any one of the following second throttling elements:
a second control situation of the opening degree of the first second throttle element: the control unit 104 is specifically further configured to control the opening degree of the second throttling element to continue to decrease if the difference between the first discharge temperature of the compressor and the initial discharge temperature of the compressor is greater than or equal to a first set temperature.
Second control of the opening degree of the second throttle element: the control unit 104 is specifically further configured to control the opening degree of the second throttling element to increase at a second set opening degree adjustment rate if the difference between the first discharge gas temperature of the compressor and the initial discharge gas temperature of the compressor is less than or equal to a second set temperature.
As shown in fig. 8, the control logic of the refrigerating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic refrigerating mode, further includes:
in step 27, the first discharge temperature T of the compressor is monitored with a decrease in the opening of the throttle valve 2 d1 . At the same time determine the initial discharge temperature T of the compressor d0 First discharge temperature T of the compressor d1 After which step 28 or step 29 is optionally performed.
Step 28, if the first discharge temperature T of the compressor d1 Initial discharge temperature T of the compressor d0 Not less than the first set temperature DeltaT 1 It is explained that the flow rate of the make-up air is appropriate at this time, the throttle valve 2 continues to be adjusted in the forward direction, that is, the opening degree of the throttle valve 2 continues to be reduced until the target exhaust gas temperature requirement is satisfied.
Step 29, if the first discharge temperature T of the compressor d1 Initial discharge temperature T of the compressor d0 The second set temperature delta T is less than or equal to 2 At the moment, the air supplementing flow is larger, the smaller the opening of the throttle valve is, the lower the exhaust temperature of the compressor is, the forward adjustment of the double throttle valve is failed, and the reverse adjustment of the double throttle valve is started, namely the opening of the throttle valve 2 adjusts the speed delta P according to the second set opening 2 S increases until the target discharge demand of the compressor is met or the positive adjustment logic demand of the double throttle is met.
Of course, the exhaust temperature of the compressor programmed for different air conditioning systems is different, and the exhaust temperature of the compressor in a common air conditioning system is within a reasonable range from 60 ℃ to 95 ℃. The control logic of the scheme of the invention mainly judges the change of the exhaust temperature of the compressor along with the reduction of the opening of the throttle valve 1, and if the exhaust temperature gradually rises along with the reduction of the opening of the throttle valve 1, the proper air supplementing quantity of the two-stage system compressor is indicated, and the forward regulation is satisfied.
If the exhaust temperature is gradually or rapidly reduced along with the reduction of the opening of the throttle valve 1, the condition that the air supplementing amount of the compressor of the two-stage system is larger is indicated, most of the refrigerant flow of the air conditioning system returns to the compressor through the air supplementing opening of the compressor, the refrigerant does not pass through the evaporator, the refrigeration effect is poor, at the moment, reverse regulation is required to be started, the opening of the throttle valve 1 is increased, more refrigerant flows into the evaporator to produce the refrigeration effect, and the exhaust temperature of the compressor can be also increased.
For example: for the cooling mode, the target discharge temperature of the compressor is 75 ℃ under the current outdoor ambient temperature 35 ℃. The air conditioning system is started and operated, the exhaust temperature of the compressor is detected to be 60 ℃, the exhaust temperature of the compressor is smaller than the target exhaust of the compressor, the throttle valve 1 is reduced by 3B/s, and 3B (namely 3 steps) corresponds to the first set opening adjustment rate delta P 1 . If the exhaust temperature of the compressor is increased from 60 ℃ to 75 ℃ along with the reduction of the opening of the throttle valve 1 in the process, the forward regulation is effective, and the forward regulation requirement is met.
If the exhaust temperature of the compressor increases from 60 ℃ to 70 ℃ during the process of decreasing the opening of the throttle valve 1, but after the exhaust temperature of the compressor exceeds 70 ℃, the exhaust temperature of the compressor decreases with decreasing opening of the throttle valve 1 (for example, the exhaust temperature of the compressor decreases to 50 ℃ after increasing to 70 ℃ during the process of decreasing the opening of the throttle valve 1), which means that the forward regulation cannot meet the exhaust requirement during the process of decreasing the opening of the throttle valve 1, and the reverse regulation must be started to increase the target exhaust. It also shows that the initial target exhaust temperature of the compressor is 75 ℃ which is not the optimal exhaust value of the unit, and the turning point of the exhaust temperature of the compressor is the optimal state. The reverse regulation is only applicable to a two-stage air supplementing system, and is ineffective to a non-air supplementing system.
In some embodiments, the control unit 104, in a case where the air conditioning system is operated in a heating mode, controls the adjusting logic of the first throttling element and the second throttling element according to the discharge temperature of the compressor or the current outdoor environment temperature of the air conditioning system in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, including:
The control unit 104 is specifically further configured to control the opening degree of the second throttling element according to a difference value between the current exhaust gas temperature of the compressor and the second heat exchange temperature of the second heat exchanger. And controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor. The specific function and process of the control unit 104 also refer to step S410.
The control unit 104 is specifically further configured to control the opening degree of the first throttling element according to a difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor in case the opening degree of the first throttling element is reduced. That is, after the opening of the first throttling element is controlled according to the current discharge temperature and the preset temperature of the compressor, if the opening of the first throttling element is reduced, the opening of the first throttling element is controlled according to the difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor when the opening of the first throttling element is reduced. The specific function and process of the control unit 104 also refer to step S420.
FIG. 9 is a schematic diagram of one embodiment of a heating flow path of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 9, in a heating flow path of a two-stage compressor air conditioning system (such as a two-stage variable frequency air conditioning system), a refrigerant output by an exhaust port of a compressor enters a gas-liquid separator through a third port of the gas-liquid separator after passing through a fourth valve port of a four-way valve, a third valve port of the four-way valve, an evaporator and a throttle valve 2. Then, the air is input to the air supplementing port of the compressor through the second port of the gas-liquid separator and the two-way valve, and the air is returned to the air suction port of the compressor through the first port of the gas-liquid separator, the throttle valve 1, the condenser, the second valve port of the four-way valve, the first valve port of the four-way valve and the liquid storage tank. By judging whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value or not, so that the reverse regulation logic is started in time when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, the air conditioning system can be always in an optimal running state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
In some embodiments, the control unit 104 controls the opening degree of the second throttling element according to a difference between the current exhaust gas temperature of the compressor and the second heat exchange temperature of the second heat exchanger, including:
the control unit 104 is specifically further configured to determine whether a difference between the current exhaust gas temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to a difference between a heating target temperature and a preset value, and whether a difference between the current exhaust gas temperature of the compressor and the second heat exchange temperature of the second heat exchanger is less than or equal to a sum of the heating target temperature and the preset value. The specific function and process of the control unit 104 also refer to step S510.
The control unit 104 is specifically further configured to control the second throttling element to decrease or increase according to the second set opening adjustment rate if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than the difference between the heating target temperature and the preset value, or if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the sum of the heating target temperature and the preset value, until the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the difference between the heating target temperature and the preset value, and the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than or equal to the sum of the heating target temperature and the preset value. The specific function and process of the control unit 104 also refer to step S520.
FIG. 10 is a control logic diagram of one embodiment of a heating circuit of a dual stage compressor air conditioning system (e.g., a dual stage inverter air conditioning system). As shown in fig. 10, the control logic of the heating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic heating mode, includes:
step 31, after the air conditioning system is started, the compressor is started and operated, and the throttle valve 1 and the throttle valve 2 are controlled according to a preset upper limit P of opening Upper limit 1 、P Upper limit 2 Operating, i.e. throttle 1 at a preset upper limit P Upper limit 1 In operation, the throttle valve 2 is operated at a preset upper opening limit P Upper limit 2 And (5) running.
Step 32, after the air conditioning system is started, monitoring the current exhaust temperature T of the compressor in real time d Current evaporating temperature T of evaporator E Initial discharge temperature T of the compressor as monitored after start-up of the air conditioning system d0 Initial evaporation temperature T of evaporator E0 And monitors the current outdoor environment temperature T Outer ring 。
Step 33, throttle valve 2 is operated at current exhaust temperature T d Current evaporator temperature T E Not less than the heating target temperature B re1 If the throttle valve 2 does not meet the requirement, the opening of the throttle valve is adjusted by a first set opening adjustment rate DeltaP 2 S decreases until the requirement is met, i.e. until the throttle valve 1 is at the current exhaust gas temperature T d Current evaporator temperature T E Not less than the heating target temperature B re1 。
In some embodiments, the control unit 104 controls the opening degree of the first throttling element according to the current discharge temperature and the preset temperature of the compressor, including a first control condition of the opening degree of any one of the following first throttling elements:
a first control situation of the opening degree of the first throttle element: the control unit 104 is specifically further configured to control the opening degree of the first throttling element to increase according to a second set opening degree adjustment rate if the current discharge temperature of the compressor is greater than the sum of the preset temperature and the preset value.
First control situation of opening degree of second type first throttle element: the control unit 104 is specifically further configured to control the opening degree of the first throttling element to maintain the current value if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value.
First control situation of opening degree of third first throttling element: the control unit 104 is specifically further configured to control the opening degree of the first throttling element to decrease if the current discharge temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value.
As shown in fig. 10, the control logic of the heating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic heating mode, further includes:
step 34, comparing the current discharge temperature T of the compressor while executing step 33 d And a preset temperature T Is provided with 。
Step 35, if the current discharge temperature T of the compressor d > preset temperature T Is provided with The opening of the throttle valve 1 is adjusted by a second set opening adjustment rate DeltaP at +1deg.C 2 And/s increases.
Step 36, if the preset temperature T Is provided with -1 ℃ < current discharge temperature T of the compressor d A preset temperature T less than or equal to Is provided with The opening degree of the throttle valve 1 is maintained constant at +1℃.
Step 37, if the compressor is currently dischargingTemperature T d A preset temperature T less than or equal to Is provided with -1 ℃, the opening of the throttle valve 1 is reduced.
In some embodiments, the control unit 104 controls the opening degree of the first throttling element according to a difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor, including a second control case of the opening degree of any one of the following first throttling elements:
second control situation of opening degree of first throttle element: the control unit 104 is specifically further configured to control the opening degree of the first throttling element to continue to decrease if the difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor is less than or equal to a first set temperature.
Second control situation of opening degree of second first throttle element: the control unit 104 is specifically further configured to control the opening degree of the second throttling element to increase at a second set opening degree adjustment rate if the difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor is greater than or equal to a second set temperature.
As shown in fig. 10, the control logic of the heating flow path of the two-stage compressor air conditioning system (such as the two-stage variable frequency air conditioning system), specifically, the operation logic of the double throttle valve (i.e. the double electronic expansion valve) in the new logic heating mode, further includes:
in step 37, the first discharge temperature T of the compressor is monitored with a decrease in the opening of the throttle valve 1 d1 . At the same time determine the initial discharge temperature T of the compressor d0 First discharge temperature T of the compressor d1 After which step 38 or step 39 is optionally performed.
Step 38, if the first discharge temperature T of the compressor d1 Initial discharge temperature T of the compressor d0 Not less than the first set temperature DeltaT 1 It is explained that the flow rate of the make-up air is appropriate at this time, the throttle valve 1 continues to be adjusted in the forward direction, that is, the opening degree of the throttle valve 1 continues to be reduced until the requirement of the target discharge temperature of the compressor is satisfied.
Step 39, if the first discharge temperature T of the compressor d1 Initial discharge of the compressorTemperature T d0 The second set temperature delta T is less than or equal to 2 At this time, the exhaust temperature of the compressor is lower as the opening of the throttle valve is smaller, the forward regulation of the double throttle valve is failed, and the reverse regulation of the double throttle valve is started, namely, the opening of the throttle valve 1 regulates the speed delta P according to the second set opening 2 S increases until the target discharge temperature of the compressor is met or the positive adjustment logic of the double throttle is met.
The two-stage compressor air conditioning system with the scheme is particularly suitable for a variable frequency air conditioning system. According to the scheme of the invention, through the change trend of the exhaust temperature and the difference between the condenser temperature and the outdoor environment temperature, the double throttle valves (namely the double electronic expansion valves) are jointly controlled, so that when the two-stage throttle valves (namely the two-stage electronic expansion valves) in the double throttle valves (namely the double electronic expansion valves) are in a wrong forward regulation optimal value, the reverse regulation logic is timely started, and the reverse control is timely started after the two-stage throttle valves (namely the two-stage electronic expansion valves) are in a wrong forward regulation optimal value, so that the air conditioning system is always in an optimal operation state, the heat exchange capacity is improved, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
Since the processes and functions implemented by the apparatus of the present embodiment substantially correspond to the embodiments, principles and examples of the foregoing methods, the descriptions of the embodiments are not exhaustive, and reference may be made to the descriptions of the foregoing embodiments and their descriptions are omitted herein.
By adopting the technical scheme of the invention, whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value is judged by comparing the change trend of the exhaust temperature in the air conditioning system of the two-stage compressor, so that the reverse regulation logic is started in time when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, the air conditioning system is always in the optimal running state, and the heat exchange capacity is improved.
There is also provided, in accordance with an embodiment of the present invention, a two-stage compressor air conditioning system corresponding to a throttle control device of the air conditioning system. The dual stage compressor air conditioning system may include: the throttle control device of the air conditioning system is described above.
Since the processing and functions implemented by the two-stage compressor air conditioning system of the present embodiment basically correspond to the embodiments, principles and examples of the foregoing apparatus, the description of the present embodiment is not exhaustive, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
By adopting the technical scheme of the invention, whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value is judged by comparing the exhaust temperature change trend in the air conditioning system of the two-stage compressor, so that the reverse regulation logic is started in time when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, the air conditioning system is always in the optimal running state, and the comfort of the indoor environment controlled by the air conditioning system is ensured.
According to an embodiment of the present invention, there is also provided a storage medium corresponding to a throttle control method of an air conditioning system, the storage medium including a stored program, wherein an apparatus in which the storage medium is controlled to execute the above-described throttle control method of an air conditioning system when the program runs.
Since the processes and functions implemented by the storage medium of the present embodiment substantially correspond to the embodiments, principles and examples of the foregoing methods, the descriptions of the present embodiment are not exhaustive, and reference may be made to the related descriptions of the foregoing embodiments, which are not repeated herein.
By adopting the technical scheme of the invention, whether the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value is judged by comparing the exhaust temperature change trend in the air conditioning system of the two-stage compressor, so that the reverse regulation logic is started in time when the secondary throttle valve (namely the secondary electronic expansion valve) misses the forward regulation optimal value, the air conditioning system is always in the optimal running state, the reverse regulation of the double throttle valve (namely the double electronic expansion valve) is started after the forward regulation optimal value is missed, and the heat exchange capacity of the air conditioning system is ensured.
In summary, it is readily understood by those skilled in the art that the above-described advantageous ways can be freely combined and superimposed without conflict.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A throttle control method of an air conditioning system, the air conditioning system comprising: the device comprises a compressor, a four-way valve, a first heat exchanger, a first throttling element, a gas-liquid separator, a second throttling element and a second heat exchanger; the exhaust port of the compressor is divided into two paths after passing through a first refrigerant flow path, the first heat exchanger and the first throttling element of the four-way valve: one path is communicated with the air supplementing port of the compressor, and the other path returns to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger and the second refrigerant flow path of the four-way valve;
the throttle control method of the air conditioning system comprises the following steps:
after the air conditioning system is started and the compressor is operated, acquiring the exhaust temperature of the compressor, acquiring the first heat exchange temperature of the first heat exchanger, acquiring the second heat exchange temperature of the second heat exchanger and acquiring the current outdoor environment temperature of the air conditioning system;
Controlling the first throttling element to operate according to a first set maximum opening degree, and controlling the second throttling element to operate according to a second set maximum opening degree;
controlling the adjusting logic of the first throttling element and the second throttling element according to the exhaust temperature of the compressor or the current outdoor environment temperature of the air conditioning system and combining the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger so as to start the preset reverse adjusting logic of the second throttling element in the first throttling element and the second throttling element under the condition that the second throttling element in the first throttling element and the second throttling element has missed the preset forward adjusting optimal value, so that the current running state of the air conditioning system is in the preset optimal running state;
if the air conditioning system operates in a refrigeration mode, the second-stage throttling element in the first throttling element and the second throttling element is the second throttling element; if the air conditioning system is operated in a heating mode, the second-stage throttling element in the first throttling element and the second throttling element is the first throttling element;
The discharge temperature of the compressor includes: an initial discharge temperature of the compressor monitored when the compressor is started, a current discharge temperature of the compressor monitored after the first throttling element is operated at a first set maximum opening and the second throttling element is operated at a second set maximum opening for a set time, and a first discharge temperature of the compressor monitored after the opening of the second throttling element is reduced;
in the case that the air conditioning system is operated in a heating mode, according to an exhaust temperature of the compressor or a current outdoor environment temperature of the air conditioning system, and in combination with a first heat exchange temperature of the first heat exchanger or a second heat exchange temperature of the second heat exchanger, controlling adjustment logic of the first throttling element and the second throttling element, including:
controlling the opening of the second throttling element according to the difference value between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger; and controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor;
and controlling the opening degree of the first throttling element according to the difference value between the initial discharge temperature of the compressor and the first discharge temperature of the compressor under the condition that the opening degree of the first throttling element is reduced.
2. The method of claim 1, wherein the adjusting logic for controlling the first and second throttling elements in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger according to the discharge temperature of the compressor or the current outdoor ambient temperature of the air conditioning system when the air conditioning system is operated in a cooling mode, comprises:
controlling the opening of the first throttling element according to the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature; and controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor;
and controlling the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor under the condition that the opening degree of the second throttling element is reduced.
3. The method for throttle control of an air conditioning system according to claim 2, wherein,
controlling the opening of the first throttling element according to the difference between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature, comprising:
Determining whether a difference between a first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to a refrigeration target temperature;
if the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is larger than the refrigeration target temperature, controlling the opening of the first throttling element to be reduced according to a first set opening adjustment rate until the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is smaller than or equal to the refrigeration target temperature;
and/or the number of the groups of groups,
controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor, wherein the method comprises the following steps:
if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate;
if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to maintain the current value;
if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening of the second throttling element to be reduced;
And/or the number of the groups of groups,
controlling the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor, comprising:
if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is greater than or equal to a first set temperature, controlling the opening degree of the second throttling element to continuously decrease;
and if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is smaller than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
4. The method for throttle control of an air conditioning system according to claim 1, wherein,
controlling the opening degree of the second throttling element according to the difference value between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger, wherein the method comprises the following steps:
determining whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to a difference between a heating target temperature and a preset value, and whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is less than or equal to a sum of the heating target temperature and the preset value;
If the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than the difference between the heating target temperature and the preset value or if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the sum of the heating target temperature and the preset value, controlling the second throttling element to reduce or increase according to a second set opening adjustment rate until the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the difference between the heating target temperature and the preset value and the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than or equal to the sum of the heating target temperature and the preset value;
and/or the number of the groups of groups,
controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor, wherein the method comprises the following steps:
if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to increase according to a second set opening adjusting rate;
if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to maintain the current value;
If the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening degree of the first throttling element to be reduced;
and/or the number of the groups of groups,
controlling the opening degree of the first throttling element according to the difference between the initial discharge temperature of the compressor and the first discharge temperature of the compressor, comprising:
if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is smaller than or equal to a first set temperature, controlling the opening degree of the first throttling element to continuously decrease;
and if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is greater than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
5. A throttle control apparatus of an air conditioning system, the air conditioning system comprising: the device comprises a compressor, a four-way valve, a first heat exchanger, a first throttling element, a gas-liquid separator, a second throttling element and a second heat exchanger; the exhaust port of the compressor is divided into two paths after passing through a first refrigerant flow path, the first heat exchanger and the first throttling element of the four-way valve: one path is communicated with the air supplementing port of the compressor, and the other path returns to the air suction port of the compressor after passing through the second throttling element, the second heat exchanger and the second refrigerant flow path of the four-way valve;
The throttle control device of the air conditioning system comprises:
the acquisition unit is configured to acquire the exhaust temperature of the compressor, acquire the first heat exchange temperature of the first heat exchanger, acquire the second heat exchange temperature of the second heat exchanger and acquire the current outdoor environment temperature of the air conditioning system after the air conditioning system is started and the compressor is operated;
a control unit configured to control the first throttling element to operate at a first set maximum opening and to control the second throttling element to operate at a second set maximum opening;
the control unit is further configured to control the adjusting logic of the first throttling element and the second throttling element according to the exhaust temperature of the compressor or the current outdoor environment temperature of the air conditioning system and in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, so as to start the preset reverse adjusting logic of the second throttling element in the first throttling element and the second throttling element to enable the current running state of the air conditioning system to be in the preset optimal running state under the condition that the second throttling element in the first throttling element and the second throttling element has missed the preset forward adjusting optimal value;
If the air conditioning system operates in a refrigeration mode, the second-stage throttling element in the first throttling element and the second throttling element is the second throttling element; if the air conditioning system is operated in a heating mode, the second-stage throttling element in the first throttling element and the second throttling element is the first throttling element;
the discharge temperature of the compressor includes: an initial discharge temperature of the compressor monitored when the compressor is started, a current discharge temperature of the compressor monitored after the first throttling element is operated at a first set maximum opening and the second throttling element is operated at a second set maximum opening for a set time, and a first discharge temperature of the compressor monitored after the opening of the second throttling element is reduced;
the control unit, in the case that the air conditioning system is operated in a heating mode, controls the adjusting logic of the first throttling element and the second throttling element according to the exhaust temperature of the compressor or the current outdoor environment temperature of the air conditioning system and in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger, including:
Controlling the opening of the second throttling element according to the difference value between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger; and controlling the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor;
and controlling the opening degree of the first throttling element according to the difference value between the initial discharge temperature of the compressor and the first discharge temperature of the compressor under the condition that the opening degree of the first throttling element is reduced.
6. The throttle control apparatus of an air conditioning system according to claim 5, wherein the control unit controls the adjustment logic of the first and second throttle elements according to the discharge temperature of the compressor or the current outdoor ambient temperature of the air conditioning system in combination with the first heat exchange temperature of the first heat exchanger or the second heat exchange temperature of the second heat exchanger in a case where the air conditioning system is operated in a cooling mode, comprising:
controlling the opening of the first throttling element according to the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature; and controlling the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor;
And controlling the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor under the condition that the opening degree of the second throttling element is reduced.
7. The throttle control apparatus of an air conditioning system according to claim 6, wherein,
the control unit controls the opening degree of the first throttling element according to the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature, and the control unit comprises:
determining whether a difference between a first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is less than or equal to a refrigeration target temperature;
if the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is larger than the refrigeration target temperature, controlling the opening of the first throttling element to be reduced according to a first set opening adjustment rate until the difference value between the first heat exchange temperature of the first heat exchanger and the current outdoor environment temperature is smaller than or equal to the refrigeration target temperature;
and/or the number of the groups of groups,
the control unit controls the opening degree of the second throttling element according to the current exhaust temperature and the preset temperature of the compressor, and the control unit comprises:
If the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate;
if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the second throttling element to maintain the current value;
if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening of the second throttling element to be reduced;
and/or the number of the groups of groups,
the control unit controls the opening degree of the second throttling element according to the difference value between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor, and the control unit comprises:
if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is greater than or equal to a first set temperature, controlling the opening degree of the second throttling element to continuously decrease;
and if the difference between the first exhaust temperature of the compressor and the initial exhaust temperature of the compressor is smaller than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
8. The throttle control apparatus of an air conditioning system according to claim 5, wherein,
the control unit controls the opening degree of the second throttling element according to the difference value between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger, and the control unit comprises:
determining whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is greater than or equal to a difference between a heating target temperature and a preset value, and whether a difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is less than or equal to a sum of the heating target temperature and the preset value;
if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than the difference between the heating target temperature and the preset value or if the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the sum of the heating target temperature and the preset value, controlling the second throttling element to reduce or increase according to a second set opening adjustment rate until the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is larger than or equal to the difference between the heating target temperature and the preset value and the difference between the current exhaust temperature of the compressor and the second heat exchange temperature of the second heat exchanger is smaller than or equal to the sum of the heating target temperature and the preset value;
And/or the number of the groups of groups,
the control unit controls the opening degree of the first throttling element according to the current exhaust temperature and the preset temperature of the compressor, and the control unit comprises:
if the current exhaust temperature of the compressor is greater than the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to increase according to a second set opening adjusting rate;
if the current exhaust temperature of the compressor is greater than the difference between the preset temperature and the preset value and the current exhaust temperature of the compressor is less than or equal to the sum of the preset temperature and the preset value, controlling the opening of the first throttling element to maintain the current value;
if the current exhaust temperature of the compressor is less than or equal to the difference between the preset temperature and the preset value, controlling the opening degree of the first throttling element to be reduced;
and/or the number of the groups of groups,
the control unit controls the opening degree of the first throttling element according to a difference value between an initial discharge temperature of the compressor and a first discharge temperature of the compressor, and includes:
if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is smaller than or equal to a first set temperature, controlling the opening degree of the first throttling element to continuously decrease;
And if the difference between the initial exhaust temperature of the compressor and the first exhaust temperature of the compressor is greater than or equal to a second set temperature, controlling the opening of the second throttling element to increase according to a second set opening adjusting rate.
9. A dual stage compressor air conditioning system, comprising: the throttle control apparatus of an air conditioning system according to any one of claims 5 to 8.
10. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to execute the throttle control method of the air conditioning system according to any one of claims 1 to 4.
CN202210743234.XA 2022-06-28 2022-06-28 Air conditioning system, throttle control method and device thereof and storage medium Active CN115200179B (en)

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CN104061705A (en) * 2014-06-12 2014-09-24 珠海格力电器股份有限公司 Two-stage compression air conditioner system and control method thereof
CN105758034A (en) * 2016-04-06 2016-07-13 广东美的制冷设备有限公司 Air conditioning system and control method thereof
CN106468487A (en) * 2016-09-29 2017-03-01 广东美的制冷设备有限公司 Air conditioning system and its control method
CN206291521U (en) * 2016-07-08 2017-06-30 广东美的制冷设备有限公司 Air-conditioning system
EP3734167A1 (en) * 2017-12-29 2020-11-04 Qingdao Haier Air Conditioner General Corp., Ltd. Air conditioner system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104061705A (en) * 2014-06-12 2014-09-24 珠海格力电器股份有限公司 Two-stage compression air conditioner system and control method thereof
CN105758034A (en) * 2016-04-06 2016-07-13 广东美的制冷设备有限公司 Air conditioning system and control method thereof
CN206291521U (en) * 2016-07-08 2017-06-30 广东美的制冷设备有限公司 Air-conditioning system
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