CN117006660A - Method and device for controlling supercooling valve and multi-split system - Google Patents

Method and device for controlling supercooling valve and multi-split system Download PDF

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Publication number
CN117006660A
CN117006660A CN202311062645.3A CN202311062645A CN117006660A CN 117006660 A CN117006660 A CN 117006660A CN 202311062645 A CN202311062645 A CN 202311062645A CN 117006660 A CN117006660 A CN 117006660A
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China
Prior art keywords
temperature
exhaust
superheat degree
supercooling
degree
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CN202311062645.3A
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Chinese (zh)
Inventor
张坤坤
任小辉
陈东
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Priority to CN202311062645.3A priority Critical patent/CN117006660A/en
Publication of CN117006660A publication Critical patent/CN117006660A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • 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

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

Abstract

The invention provides a supercooling valve control method, a supercooling valve control device and a multi-split system; wherein the method comprises the following steps: after all outdoor units are operated for a preset period of time in a refrigerating mode, periodically acquiring operation parameters; wherein the operating parameters include: the superheat degree of the internal machine, the exhaust temperature and the exhaust superheat degree, and the opening of the supercooling valve corresponding to the target pipe temperature; determining a control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold; in the control mode, determining a target opening corresponding to the current period according to the operation parameters and a preset superheat threshold; and controlling the supercooling valve to operate according to the target opening degree in the current period. According to the control mode, different control modes of the supercooling valve are determined according to the exhaust temperature, and in the control mode, the opening of the supercooling valve is intelligently controlled according to the opening of the supercooling valve, the superheat degree of the exhaust and the superheat degree of the internal machine, so that the exhaust of the multi-split system is stable, the output is maximum, and the operation effect of the multi-split system is improved.

Description

Method and device for controlling supercooling valve and multi-split system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a supercooling valve control method and device and a multi-split system.
Background
For a supercooling valve of a multi-split air conditioner system (namely a multi-split air conditioner unit), the control is mainly performed according to the supercooling degree, specifically, a target supercooling degree (numerical value or range) is set, and when the actual supercooling degree is smaller than the target supercooling degree, the opening degree of the supercooling valve is controlled to be increased; when the actual supercooling degree is greater than the target supercooling degree, the opening degree of the control supercooling valve is reduced. The full supercooling is filled, the target superheat degree is generally set to be relatively large, the opening of the supercooling valve returns liquid in the process of continuously increasing, the opening of the supercooling valve is reduced due to the liquid return, the supercooling degree is insufficient after the opening is reduced, the opening is increased again, and the operation is repeated. In addition, the supercooling valve is also controlled by the exhaust gas, such as when the exhaust gas temperature is high, the supercooling valve is forcibly opened to lower the exhaust gas temperature, and when the exhaust gas temperature is lowered, the supercooling valve resumes normal control.
The above-mentioned scheme can realize the control of the supercooling valve, but has the following problems: the fixed target supercooling degree may not be suitable for different working conditions and systems, for example, the opening degree of the supercooling valve is larger, or the opening degree is forcedly increased for reducing the exhaust temperature, and the exhaust temperature is withdrawn until the exhaust temperature is reduced to be lower, so that the opening degree of the supercooling valve is larger, and the main path refrigerant is smaller, so that the capacity output of the multi-split system is smaller, and the operation effect of the multi-split system is affected.
Disclosure of Invention
Accordingly, the present invention is directed to a method and an apparatus for controlling a supercooling valve, and a multi-split system, which are capable of reducing the above problems, and intelligently controlling the opening of the supercooling valve according to the opening of the supercooling valve, the superheat degree of the exhaust gas, and the superheat degree of the internal unit, so that the exhaust gas of the multi-split system is stable, the output is maximum, and the operation effect of the multi-split system is improved.
In a first aspect, an embodiment of the present invention provides a supercooling valve control method, which is applied to a multi-split system; the multi-split air conditioner system comprises a plurality of outdoor units and a plurality of indoor units; the method comprises the following steps: after all outdoor units are operated for a preset period of time in a refrigerating mode, periodically acquiring operation parameters; wherein the operating parameters include: the indoor heat exchanger comprises an indoor unit, an outdoor unit, a compressor, a supercooling valve opening and a target pipe temperature, wherein the indoor unit is corresponding to each running indoor unit; determining a control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold; the control method comprises a first control method and a second control method, wherein the first control method is used for representing a method for controlling the supercooling valve according to a preset target supercooling degree, and the second control method is used for representing a method for controlling the supercooling valve according to the exhaust temperature; in the control mode, determining a target opening corresponding to the current period according to the operation parameters and a preset superheat threshold; and controlling the supercooling valve to operate according to the target opening degree in the current period.
According to the supercooling valve control method, different control modes of the supercooling valve are determined according to the exhaust temperature, and in the control modes, the opening of the supercooling valve is intelligently controlled according to the opening of the supercooling valve, the superheat degree of the exhaust and the superheat degree of the internal machine, so that the exhaust of the multi-split system is stable, the output is maximum, and the operation effect of the multi-split system is improved.
Preferably, the step of determining the control mode of the supercooling valve in the current period according to the exhaust temperature and the preset temperature threshold includes: if the exhaust temperature is not greater than a preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is a first control mode; or if the exhaust temperature is greater than the preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is a second control mode.
Preferably, in the above control manner, the step of determining the target opening corresponding to the current period according to the operation parameter and the preset superheat threshold includes: if the control mode is the first control mode, acquiring a history parameter before the current period; wherein the history parameters include: the method comprises the steps of a first historical parameter corresponding to a previous period, a second historical parameter corresponding to the previous period and a third historical parameter corresponding to the previous period; and determining the target opening corresponding to the current period according to the historical parameters and the superheat threshold.
Preferably, the superheat threshold includes a first superheat threshold, a second superheat threshold, and a third superheat threshold; the first history parameters include: the first inner machine superheat degree, the first exhaust superheat degree and the opening of the first supercooling valve corresponding to the target pipe temperature in the previous period; the second history parameters include: the second internal machine superheat degree, the second exhaust superheat degree and the second supercooling valve opening corresponding to the target pipe temperature in the previous period; the third history parameters include: the third inner machine superheat degree, the third exhaust superheat degree and the third supercooling valve opening corresponding to the target pipe temperature in the last cycle; determining a target opening corresponding to the current period according to the history parameter and the superheat threshold, wherein the determining comprises the following steps: and if the first internal machine superheat degree, the second internal machine superheat degree and the third internal machine superheat degree are equal to the first superheat degree threshold value, and the first exhaust superheat degree, the second exhaust superheat degree and the third exhaust superheat degree are all larger than the second superheat degree threshold value, calculating according to the opening of the first supercooling valve, the opening of the second supercooling valve and the opening of the third supercooling valve to obtain the target opening corresponding to the current period.
Preferably, the step of calculating the target opening corresponding to the current period according to the first subcooling valve opening, the second subcooling valve opening and the third subcooling valve opening includes: the calculation formula of the target opening is as follows: pa= (p1+p2+p3)/3; where Pa represents a target opening degree, P1 represents a first subcooling valve opening degree, P2 represents a second subcooling valve opening degree, and P3 represents a third subcooling valve opening degree.
Preferably, in the above control manner, the step of determining the target opening corresponding to the current period according to the operation parameter and the preset superheat threshold further includes: when the control mode is the second control mode, if the exhaust temperature of the current period is smaller than the exhaust temperature of the previous period, and the superheat degree of the internal machine of the current period is equal to the third superheat degree threshold, and the exhaust superheat degree of the current period is larger than the second superheat degree threshold, the opening of the first supercooling valve corresponding to the target pipe temperature of the previous period is taken as the target opening corresponding to the current period.
Preferably, the step of periodically acquiring the operation parameter includes: in each period, acquiring the inlet temperature and the outlet temperature of the indoor heat exchanger, and calculating to obtain the superheat degree of the indoor unit according to the inlet temperature and the outlet temperature; and obtaining the saturation temperature corresponding to the high-pressure in the outdoor unit, and calculating the exhaust superheat degree of the compressor in the outdoor unit according to the exhaust temperature and the saturation temperature.
In a second aspect, an embodiment of the present invention further provides a supercooling valve control apparatus, which is applied to a multi-split system; the multi-split air conditioner system comprises a plurality of outdoor units and a plurality of indoor units; the device comprises: the parameter acquisition module is used for periodically acquiring operation parameters after all outdoor refrigeration operation is performed for a preset time period; wherein the operating parameters include: the indoor heat exchanger comprises an indoor unit, an outdoor unit, a compressor, a supercooling valve opening and a target pipe temperature, wherein the indoor unit is corresponding to each running indoor unit; the first determining module is used for determining a control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold value, wherein the first control mode is used for representing a mode of controlling the supercooling valve according to a preset target supercooling degree, and the second control mode is used for representing a mode of controlling the supercooling valve according to the exhaust temperature; the control modes comprise a first control mode and a second control mode; the second determining module is used for determining a target opening corresponding to the current period according to the operation parameters and a preset superheat threshold value in a control mode; and the control operation module is used for controlling the supercooling valve to operate according to the target opening degree in the current period.
In a third aspect, an embodiment of the present invention further provides a multi-split system, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the computer program to implement the steps of the method of the first aspect.
In a fourth aspect, embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect described above.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a supercooling valve control method, a supercooling valve control device and a multi-split system, wherein after all outdoor refrigeration is operated for a preset period of time, operation parameters are periodically acquired; wherein the operating parameters include: the indoor heat exchanger comprises an indoor unit, an outdoor unit, a compressor, a supercooling valve opening and a target pipe temperature, wherein the indoor unit is corresponding to each running indoor unit; determining a control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold; in the control mode, determining a target opening corresponding to the current period according to the operation parameters and a preset superheat threshold; and controlling the supercooling valve to operate according to the target opening degree in the current period. According to the control mode, different control modes of the supercooling valve are determined according to the exhaust temperature, and in the control mode, the opening of the supercooling valve is intelligently controlled according to the opening of the supercooling valve, the superheat degree of the exhaust and the superheat degree of the internal machine, so that the exhaust of the multi-split system is stable, the output is maximum, and the operation effect of the multi-split system is improved.
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 objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling a supercooling valve according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for controlling a subcooling valve according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a multi-split system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a supercooling valve control apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another multi-split system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. 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 order to facilitate understanding of the present embodiment, the following describes embodiments of the present invention in detail.
Embodiment one:
the embodiment of the invention provides a supercooling valve control method which is applied to a multi-split air conditioner system; the multi-split air conditioner system comprises a plurality of outdoor units and a plurality of indoor units; as shown in fig. 1, the method comprises the steps of:
step S102, periodically acquiring operation parameters after all outdoor units are operated for a preset period of time in a refrigerating mode; wherein the operating parameters include: the superheat degree of the indoor unit corresponding to each running indoor unit, the exhaust temperature and the exhaust superheat degree of the compressor in each outdoor unit, and the opening of the supercooling valve corresponding to the target pipe temperature;
In practical application, a controller and a plurality of temperature acquisition devices, such as temperature sensors or temperature sensing bags, which are in communication connection with the controller are arranged in the multi-split system so as to acquire the temperature of a designated position. The temperature acquisition device comprises, but is not limited to, a first temperature sensor arranged at an inlet of the indoor heat exchanger, a second temperature sensor arranged at an outlet of the indoor heat exchanger, a third temperature sensor arranged at a middle coil pipe of the indoor heat exchanger, a fourth temperature sensor arranged at an exhaust port of the compressor and the like, and the setting position of the specific temperature acquisition device can be set according to actual conditions.
The process of periodically acquiring the operation parameters is as follows: in each period, acquiring the inlet temperature and the outlet temperature of the indoor heat exchanger, and calculating to obtain the superheat degree of the indoor unit according to the inlet temperature and the outlet temperature; and obtaining the saturation temperature corresponding to the high-pressure in the outdoor unit, and calculating the exhaust superheat degree of the compressor in the outdoor unit according to the exhaust temperature and the saturation temperature.
Specifically, in each period, for each indoor unit running, the controller acquires the inlet temperature of the indoor heat exchanger acquired by the first temperature sensor, the outlet temperature of the indoor heat exchanger acquired by the second temperature sensor and the middle tube temperature acquired by the third temperature sensor, and calculates the superheat degree of the indoor heat exchanger according to the inlet temperature and the outlet temperature; and meanwhile, taking the minimum tube temperature of the middle tube temperature in the period as the target tube temperature, namely, the target tube temperature is used for representing the minimum tube temperature of the middle tube temperature of the indoor heat exchanger in the indoor unit, and acquiring the opening of the supercooling valve corresponding to the target tube temperature. In addition, for each outdoor unit in all the outdoor units, the controller also obtains the exhaust temperature collected by the fourth temperature sensor arranged at the exhaust port of the compressor in the outdoor unit, and calculates the exhaust superheat degree according to the exhaust temperature and the saturation temperature, and if the exhaust temperature minus the saturation temperature corresponding to the high-pressure is the exhaust superheat degree of the compressor.
It should be noted that, the above-mentioned calculation process of the superheat degree of the indoor unit of each indoor unit and the superheat degree of the exhaust gas of the compressor of each outdoor unit may refer to the prior art, and the embodiments of the present invention are not described in detail herein. And the preset time length is preferably 10min, each period is preferably 40s, and the specific preset time length and the time corresponding to the period can be set according to actual conditions.
Step S104, determining a control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold;
the control method comprises a first control method and a second control method, wherein the first control method is used for representing a method for controlling the supercooling valve according to a preset target supercooling degree, for example, when the actual supercooling degree is smaller than the target supercooling degree, the opening degree of the supercooling valve is controlled to be increased, and otherwise, the opening degree of the supercooling valve is controlled to be decreased; the second control mode is used for representing a mode of forcedly controlling the supercooling valve according to the exhaust temperature, namely, when the exhaust temperature is higher, the supercooling valve is forcedly opened to reduce the exhaust temperature, and when the exhaust temperature is reduced, the supercooling valve is restored to normal control.
Specifically, if the exhaust temperature is not greater than a preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is a first control mode; namely, when the exhaust temperature of the supercooling valve is low, controlling the supercooling valve according to the target supercooling degree; or if the exhaust temperature is greater than the preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is a second control mode; that is, when the exhaust temperature of the supercooling valve is high, the supercooling valve is forcibly controlled according to the exhaust temperature. Therefore, the control mode corresponding to the supercooling valve is determined according to different exhaust temperature scenes, the opening control precision of the supercooling valve is improved, and the operation effect of the multi-split system is further ensured.
It should be noted that, for a plurality of outdoor units in the multi-split system, a control mode of the supercooling valve in each outdoor unit is determined according to the exhaust temperature of the compressor in the outdoor unit; for example, the multi-split air conditioner system comprises a first outdoor unit and a second outdoor unit, and if the exhaust temperature of a compressor in the first outdoor unit is not greater than a preset temperature threshold, the opening of a supercooling valve in the first outdoor unit is controlled in a current period according to a first control mode; similarly, if the discharge temperature of the compressor in the second outdoor unit is greater than the preset temperature threshold, the opening of the supercooling valve in the second outdoor unit is controlled in the current period according to the second control mode, so that the control mode of the supercooling valve in the outdoor unit is determined according to the discharge temperature of the compressor, and the control precision of each supercooling valve is ensured.
Step S106, in the control mode, determining a target opening corresponding to the current period according to the operation parameters and a preset superheat threshold;
specifically, after the control mode of the supercooling valve in the current period is determined according to the exhaust temperature, the target opening corresponding to the current period is determined according to the operation parameter of the current period and the preset superheat threshold, namely, the opening of the supercooling valve, the superheat degree of the exhaust and the superheat degree of the internal machine are intelligently controlled together, and compared with the mode of singly controlling the supercooling valve, the mode of intelligently controlling multiple parameters together ensures that the exhaust of the multi-split system is stable, the output of the multi-split system is maximum, and therefore the operation effect of the multi-split system is improved.
Step S108, controlling the supercooling valve to operate according to the target opening degree in the current period.
According to the supercooling valve control method provided by the embodiment of the invention, different control modes of the supercooling valve are determined according to the exhaust temperature, and in the control modes, the opening of the supercooling valve is intelligently controlled together according to the opening of the supercooling valve, the superheat degree of the exhaust and the superheat degree of the internal machine, so that the exhaust of the multi-split system is stable, the output is maximum, the operation effect of the multi-split system is improved, and the control precision of the supercooling valve is also improved.
In one embodiment, if the control mode is the first control mode, in the control mode, a process of determining the target opening corresponding to the current period according to the operation parameter and the preset superheat threshold is as follows: acquiring a history parameter before a current period; wherein the history parameters include: the method comprises the steps of a first historical parameter corresponding to a previous period, a second historical parameter corresponding to the previous period and a third historical parameter corresponding to the previous period; and determining the target opening corresponding to the current period according to the historical parameters and the superheat threshold.
The superheat threshold comprises a first superheat threshold, a second superheat threshold and a third superheat threshold; the first history parameters include: the first inner machine superheat degree, the first exhaust superheat degree and the opening of the first supercooling valve corresponding to the target pipe temperature in the previous period; the first indoor unit superheat degree comprises the indoor unit superheat degree corresponding to the last period of each indoor unit in operation, the first exhaust superheat degree comprises the exhaust superheat degree corresponding to the last period of each compressor of each outdoor unit in all the outdoor units in operation, and the first supercooling valve opening degree refers to the supercooling valve opening degree corresponding to the last period of the target pipe temperature in the last period. Similarly, the second history parameters include: the second internal machine superheat degree, the second exhaust superheat degree and the second supercooling valve opening corresponding to the target pipe temperature in the previous period; the second superheat degree of the indoor units comprises the superheat degree of the indoor units corresponding to the last cycle of each indoor unit, the second discharge superheat degree comprises the discharge superheat degree corresponding to the last cycle of each compressor of all the outdoor units in the outdoor units, and the second subcooling valve opening degree refers to the subcooling valve opening degree corresponding to the last cycle of the target pipe temperature of the last cycle. And, the third history parameter includes: the third inner machine superheat degree, the third exhaust superheat degree and the third supercooling valve opening corresponding to the target pipe temperature in the last cycle; the third superheat degree of the indoor units comprises the superheat degree of the indoor units corresponding to the last cycle, the third discharge superheat degree comprises the discharge superheat degree corresponding to the last cycle of the compressors of all the outdoor units in the outdoor units, and the third subcooling valve opening degree refers to the subcooling valve opening degree corresponding to the last cycle of the target tube temperature in the last cycle.
Specifically, if the first internal machine superheat degree, the second internal machine superheat degree and the third internal machine superheat degree are all equal to the first superheat degree threshold, and the first exhaust superheat degree, the second exhaust superheat degree and the third exhaust superheat degree are all greater than the second superheat degree threshold, calculating according to the first subcooling valve opening, the second subcooling valve opening and the third subcooling valve opening to obtain the target opening corresponding to the current period.
For convenience of explanation, an outdoor unit is taken as an example. If the first, second and third indoor unit superheat degrees of all indoor units are equal to the first superheat degree threshold, and the first, second and third discharge superheat degrees of the compressor of the outdoor unit are all greater than the second superheat degree threshold, the target opening corresponding to the current period of the compressor of the outdoor unit can be calculated according to the first, second and third subcooling valve opening. The calculation formula of the target opening is as follows:
Pa＝(P1+P2+P3)/3
where Pa represents a target opening degree, P1 represents a first subcooling valve opening degree, P2 represents a second subcooling valve opening degree, and P3 represents a third subcooling valve opening degree.
Therefore, for three consecutive history periods before the current period, namely the last period, the last period; if the following conditions are satisfied: (1) in the previous cycle, the first indoor unit superheat degree=a first superheat degree threshold value of all indoor units, the first exhaust superheat degree of the compressor of the outdoor unit is larger than a second superheat degree threshold value, and the opening of a first supercooling valve corresponding to the target pipe temperature in the outdoor unit in the previous cycle is P1; (2) in the last cycle, the second indoor unit superheat degree=the first superheat degree threshold value of all indoor units, and the second exhaust superheat degree of the compressor of the outdoor unit is larger than the second superheat degree threshold value, and the opening of the second supercooling valve corresponding to the target pipe temperature in the outdoor unit in the last cycle is P2; (3) in the last cycle, the third indoor unit superheat degree=the first superheat degree threshold value of all the indoor units, and the third exhaust superheat degree of the compressor of the outdoor unit is larger than the second superheat degree threshold value, and the opening of the third supercooling valve corresponding to the target pipe temperature in the outdoor unit in the last cycle is P3; the supercooling valve of the outdoor unit is controlled to operate according to the target opening Pa in the following period when the target opening Pa of the supercooling valve of the outdoor unit is the same as the target opening Pa in the current period.
Therefore, when the exhaust temperature of the supercooling valve of each outdoor unit is lower, the supercooling valve is controlled according to the first control mode, in the control mode, the superheat degree of the indoor unit is detected to be in an optimal state under a certain opening degree, the superheat degree of the exhaust is satisfied without liquid return, the target pipe temperature of the indoor unit is lowest, and the output of the multi-split system is maximum at the moment, so that the supercooling valve is controlled to operate according to the calculated target opening degree, and operate according to the target opening degree in a subsequent period until the control mode is changed, and the supercooling valve is controlled according to the changed control mode.
In one embodiment, when the control mode is the second control mode, in the control mode, the process of determining the target opening corresponding to the current period according to the operation parameter and the preset superheat threshold is as follows: and if the exhaust temperature in the current period is smaller than the exhaust temperature in the previous period, and the superheat degree of the internal machine in the current period is equal to the third superheat degree threshold value, and the exhaust superheat degree in the current period is larger than the second superheat degree threshold value, taking the opening of the first supercooling valve corresponding to the target pipe temperature in the previous period as the target opening corresponding to the current period.
Specifically, with the second control method, if the exhaust temperature in the current cycle is lower than the exhaust temperature in the previous cycle, the exhaust temperature is reduced, which means that the opening degree of the supercooling valve can maintain the stability of the exhaust. When the superheat degree of the inner machine is equal to the third superheat degree threshold value and the exhaust superheat degree is greater than the second superheat degree threshold value, the inner machine superheat degree and the exhaust superheat degree meet the requirement of not violent liquid return, so that the opening of the first supercooling valve corresponding to the target pipe temperature in the previous period is used as the target opening, the exhaust stability can be kept, the refrigerant quantity of the main circuit of the multi-split system can be kept to the maximum extent, and the running efficiency of the multi-split system is improved.
Example two
On the basis of the embodiment of the method, the embodiment of the invention provides another supercooling valve control method which is applied to a multi-split system; the multi-split air conditioner system comprises a plurality of outdoor units and a plurality of indoor units, and the method mainly describes the determination of different control modes of the supercooling valve and the determination process of the target opening degree in each control mode.
As shown in fig. 2, the method comprises the steps of:
step S202, performing full-open refrigeration operation on an outdoor unit in the multi-split air conditioner system, and continuously operating for 10 minutes; for convenience of explanation, a supercooling valve of an outdoor unit is taken as an example;
Step S204, judging that Td is less than or equal to A; namely, judging whether the discharge temperature of the compressor of the outdoor unit is not more than a preset temperature threshold, if so, executing step S206; if not, executing step S212; wherein Td is the exhaust temperature in the current period, A is a preset temperature threshold, and the value range is 100-110 ℃, preferably 105 ℃;
step S206, a first control mode; namely, controlling the supercooling valve according to the target supercooling degree;
step S208, judging whether three previous continuous periods are satisfied: first period (i.e. last period), the superheat degree of the internal unit=b and the superheat degree of the exhaust gas > C, the target tube temperature Tem min The corresponding supercooling valve opening is P3; in the second period (i.e. the last period), the superheat degree of the internal unit=b and the superheat degree of the exhaust gas > C, the target tube temperature Tem min The corresponding opening degree of the supercooling valve is P2; in the third period (i.e. the last period), the superheat degree of the internal unit=b and the superheat degree of the exhaust gas > C, the target tube temperature Tem min The corresponding supercooling valve opening is P1; if yes, executing step S210, otherwise, returning to step S206, and continuing to control the supercooling valve according to the first control mode, namely, when three consecutive periods before the current period do not meet the above conditions, continuing to control the supercooling valve according to the target supercooling degree until three consecutive periods before the current period meet the above conditions;
Wherein B represents a first superheat threshold, and the value range is-1-3 ℃, preferably 0 ℃; c represents a second superheat threshold, the value range is 10-40 ℃, and the optimal value is 20 ℃;
step S210, subsequent P (n) =pa= (p1+p2+p3)/3; controlling the supercooling valve to operate according to the target opening Pa in the current period and the subsequent period, and keeping unchanged; wherein P represents the opening degree of the supercooling valve, and n represents the current period;
step S212, a second control mode; namely, forcedly controlling the supercooling valve according to the exhaust temperature;
step S214, judging whether: td (n) < Td (n-1), and the internal machine superheat=d and the exhaust superheat > C in the current period n; if yes, executing step S216, otherwise, returning to step S212, and continuing to forcedly control the supercooling valve according to a second control mode, namely continuing to adjust the opening of the supercooling valve according to the exhaust temperature; wherein D represents a third superheat threshold, and the value range is-3 ℃, preferably 0 ℃;
step S216, subsequent P (n) =pb, where Pb is the target tube temperature Tem in the previous cycle min Corresponding supercooling valve opening; thus, when the exhaust gas temperature is reduced, the degree of superheat of the internal unit and the degree of superheat of the exhaust gas are satisfied, and the opening degree of the supercooling valve is maintained to be the opening degree of the supercooling valve corresponding to the target pipe temperature in the previous cycle, namely, the opening degree of the supercooling valve corresponding to the minimum Guan Wen.
For ease of understanding, this is illustrated herein. For example, for a multi-split air conditioner system, after the outdoor unit of the multi-split air conditioner system is fully opened and cooled for 10min, a certain supercooling valve is periodically changed (180 pls-240 pls), and the corresponding compressor exhaust temperature is 97-98 ℃.
In three history periods before the current period, in the first history period, the opening of a supercooling valve corresponding to the target tube temperature is 200pls, the superheat degree of an internal machine is 1 ℃, the superheat degree of exhaust is 20 ℃, the target tube temperature is 10 ℃, the opening of the supercooling valve in the second history period is 210pls, the superheat degree of the internal machine is 1 ℃, the superheat degree of exhaust is 21 ℃, the tube temperature of the internal machine is 10.1 ℃ at the minimum, the opening of the supercooling valve in the third history period is 206pls, the superheat degree of the internal machine is 1 ℃, the superheat degree of exhaust is 17 ℃, and the tube temperature of the internal machine is 10.3 ℃ at the minimum. Then the opening of the super-cooled valve is subsequently maintained at 205pls.
Therefore, according to the supercooling valve control method, the opening degree of the supercooling valve is intelligently controlled according to the opening degree of the supercooling valve, the superheat degree of the exhaust and the superheat degree of the internal unit, so that the exhaust of the multi-split system is stable, the output is maximum, and the operation effect of the multi-split system is improved.
Example III
The embodiment of the invention provides a multi-split system, as shown in fig. 3, including but not limited to: a compressor 301, a gas-liquid separator 302, an oil separator 303, a four-way valve 304, an outdoor heat exchanger 305, a plate heat exchanger 306, an electronic expansion valve 307, a supercooling valve 308, a liquid pipe shutoff valve 309, and a gas pipe shutoff valve 310; the structure of the specific multi-split system can refer to the existing multi-split system, and the embodiment of the invention is not described in detail here.
Specifically, in the cooling mode, the refrigerant is condensed by the outdoor heat exchanger 305 and mainly circulates in 2 paths, wherein 1 path (main path) is the through-plate heat exchanger 306 to the liquid pipe stop valve 309 and the indoor unit (not shown), and the other 1 path (auxiliary path) is the through-cooling valve 308 to the gas-liquid separator 302, so that the opening degree of the through-cooling valve 308 can control the supercooling degree (high pressure temperature-liquid pipe temperature) and the exhaust temperature. However, when the opening of the supercooling valve 308 is larger, the main refrigerant is smaller, and the capacity output is insufficient; when the opening of the supercooling valve 308 is smaller, the supercooling degree is insufficient, the output of the indoor unit is also smaller due to the problem of long pipe pressure loss, and the exhaust temperature is also higher. Therefore, the opening degree of the supercooling valve 308 is controlled in a reasonable range, so that not only can the exhaust stability be ensured, but also the maximum output of the multi-split air conditioning system can be ensured.
When the exhaust temperature is lower, the supercooling valve 308 is controlled to be opened or closed by the target supercooling degree, in the process, the degree of superheat of the internal unit is detected to be in an optimal state, the degree of superheat of the exhaust unit meets the condition that liquid is not returned, and the target pipe temperature is lowest, which means that the output of the multi-split system is the largest at the moment, so that the opening degree of the subsequent supercooling valve 308 maintains the average opening degree Pa corresponding to the continuous 3 periods before the current period.
Conversely, when the temperature is relatively high, the supercooling valve 308 is forcibly controlled to be opened by the exhaust temperature to reduce the exhaust temperature, and the indoor unit pipe temperature is gradually increased during the reduction process. During the process of opening the super-cooling valve, the exhaust temperature gradually decreases, and when the exhaust temperature decreases, this indicates that the opening of the super-cooling valve 308 can maintain the stability of the exhaust. At this time, in the process of finding out the decrease of the exhaust temperature, the supercooling valve 308 maintains the opening Pb corresponding to the lowest engine pipe temperature (i.e., the target pipe temperature) in the previous period under the condition that the superheat degree of the internal engine and the superheat degree of the exhaust meet the condition of not severely returning liquid, so that the exhaust is kept constant, the refrigerant quantity on the main path can be kept to the maximum extent, the lowest pipe temperature is kept, the output is increased, and the operation effect of the multi-split air conditioner system is ensured.
Example IV
Corresponding to the embodiment of the method, the embodiment of the invention also provides a supercooling valve control device which is applied to the multi-split system; the multi-split air conditioner system comprises a plurality of outdoor units and a plurality of indoor units; as shown in fig. 4, the apparatus includes: a parameter acquisition module 41, a first determination module 42, a second determination module 43, and a control operation module 44; wherein, the functions of each module are as follows:
The parameter obtaining module 41 is configured to periodically obtain an operation parameter after all outdoor refrigeration operation is performed for a preset period of time; wherein the operating parameters include: the indoor heat exchanger comprises an indoor unit, an outdoor unit, a compressor, a supercooling valve opening and a target pipe temperature, wherein the indoor unit is corresponding to each running indoor unit;
a first determining module 42, configured to determine a control manner of the supercooling valve in a current period according to the exhaust temperature and a preset temperature threshold; the control method comprises a first control method and a second control method, wherein the first control method is used for representing a method for controlling the supercooling valve according to a preset target supercooling degree, and the second control method is used for representing a method for controlling the supercooling valve according to the exhaust temperature;
a second determining module 43, configured to determine, in a control manner, a target opening corresponding to the current period according to the operation parameter and a preset superheat threshold;
the control operation module 44 is configured to control the operation of the supercooling valve according to the target opening in the current period.
According to the supercooling valve control device provided by the embodiment of the invention, different control modes of the supercooling valve are determined according to the exhaust temperature, and in the control modes, the opening of the supercooling valve is intelligently controlled together according to the opening of the supercooling valve, the superheat degree of the exhaust and the superheat degree of the internal unit, so that the exhaust of the multi-split system is stable, the output is maximum, and the operation effect of the multi-split system is improved.
Preferably, the first determining module 42 is further configured to: if the exhaust temperature is not greater than a preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is a first control mode; or if the exhaust temperature is greater than the preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is a second control mode.
Preferably, the second determining module 43 is further configured to: if the control mode is the first control mode, acquiring a history parameter before the current period; wherein the history parameters include: the method comprises the steps of a first historical parameter corresponding to a previous period, a second historical parameter corresponding to the previous period and a third historical parameter corresponding to the previous period; and determining the target opening corresponding to the current period according to the historical parameters and the superheat threshold.
Preferably, the superheat threshold includes a first superheat threshold, a second superheat threshold, and a third superheat threshold; the first history parameters include: the first inner machine superheat degree, the first exhaust superheat degree and the opening of the first supercooling valve corresponding to the target pipe temperature in the previous period; the second history parameters include: the second internal machine superheat degree, the second exhaust superheat degree and the second supercooling valve opening corresponding to the target pipe temperature in the previous period; the third history parameters include: the third inner machine superheat degree, the third exhaust superheat degree and the third supercooling valve opening corresponding to the target pipe temperature in the last cycle; determining a target opening corresponding to the current period according to the historical parameters and the superheat threshold value comprises the following steps: and if the first internal machine superheat degree, the second internal machine superheat degree and the third internal machine superheat degree are equal to the first superheat degree threshold value, and the first exhaust superheat degree, the second exhaust superheat degree and the third exhaust superheat degree are all larger than the second superheat degree threshold value, calculating according to the opening of the first supercooling valve, the opening of the second supercooling valve and the opening of the third supercooling valve to obtain the target opening corresponding to the current period.
Preferably, the calculating the target opening corresponding to the current period according to the first subcooling valve opening, the second subcooling valve opening and the third subcooling valve opening includes: the calculation formula of the target opening is as follows: pa= (p1+p2+p3)/3; where Pa represents a target opening degree, P1 represents a first subcooling valve opening degree, P2 represents a second subcooling valve opening degree, and P3 represents a third subcooling valve opening degree.
Preferably, the second determining module 43 is further configured to: when the control mode is the second control mode, if the exhaust temperature of the current period is smaller than the exhaust temperature of the previous period, and the superheat degree of the internal machine of the current period is equal to the third superheat degree threshold, and the exhaust superheat degree of the current period is larger than the second superheat degree threshold, the opening of the first supercooling valve corresponding to the target pipe temperature of the previous period is taken as the target opening corresponding to the current period.
Preferably, the parameter obtaining module 41 is further configured to: in each period, acquiring the inlet temperature and the outlet temperature of the indoor heat exchanger, and calculating to obtain the superheat degree of the indoor unit according to the inlet temperature and the outlet temperature; and obtaining the saturation temperature corresponding to the high-pressure in the outdoor unit, and calculating the exhaust superheat degree of the compressor in the outdoor unit according to the exhaust temperature and the saturation temperature.
The supercooling valve control device provided by the embodiment of the invention has the same technical characteristics as the supercooling valve control method provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
The embodiment of the invention also provides a multi-split system which comprises a processor and a memory, wherein the memory stores machine executable instructions which can be executed by the processor, and the processor executes the machine executable instructions to realize the supercooling valve control method.
Referring to fig. 5, the multi-split system includes a processor 100 and a memory 101, the memory 101 storing machine-executable instructions that can be executed by the processor 100, and the processor 100 executing the machine-executable instructions to implement the above-described supercooling valve control method.
Further, the multi-split system shown in fig. 5 further includes a bus 102 and a communication interface 103, where the processor 100, the communication interface 103 and the memory 101 are connected through the bus 102.
The memory 101 may include a high-speed random access memory (RAM, random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. The communication connection between the system network element and at least one other network element is implemented via at least one communication interface 103 (which may be wired or wireless), and may use the internet, a wide area network, a local network, a metropolitan area network, etc. Bus 102 may be an ISA (Industrial Standard Architecture, industry standard architecture) bus, PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or EISA (Enhanced Industry Standard Architecture, extended industry standard architecture) bus, among others. The buses may be classified into address buses, data buses, control buses, and the like. For ease of illustration, only one bi-directional arrow is shown in FIG. 5, but not only one bus or type of bus.
The processor 100 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 100 or by instructions in the form of software. The processor 100 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but also digital signal processors (Digital Signal Processor, DSP for short), application specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), field-programmable gate arrays (Field-Programmable Gate Array, FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 101, and the processor 100 reads the information in the memory 101 and, in combination with its hardware, performs the steps of the method of the previous embodiment.
The present embodiment also provides a machine-readable storage medium storing machine-executable instructions that, when invoked and executed by a processor, cause the processor to implement the above-described subcooling valve control method.
The supercooling valve control method, apparatus and computer program product of the multi-split system provided by the embodiments of the present invention include a computer readable storage medium storing program codes, and the instructions included in the program codes may be used to execute the method described in the foregoing method embodiment, and specific implementation may refer to the method embodiment and will not be repeated herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In addition, in the description of embodiments of the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A supercooling valve control method is characterized by being applied to a multi-split air conditioner system; the multi-split air conditioner system comprises a plurality of outdoor units and a plurality of indoor units; the method comprises the following steps:
after all the outdoor refrigeration operation is performed for a preset time period, periodically acquiring operation parameters; wherein the operating parameters include: the superheat degree of the indoor unit corresponding to each running indoor unit, the exhaust temperature and the exhaust superheat degree of the compressor in each outdoor unit, the supercooling valve opening corresponding to a target tube temperature, wherein the target tube temperature is used for representing the minimum tube temperature of the middle tube temperature of the indoor heat exchanger in the indoor unit;
Determining a control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold; the control method comprises a first control method and a second control method, wherein the first control method is used for representing a method for controlling the supercooling valve according to a preset target supercooling degree, and the second control method is used for representing a method for controlling the supercooling valve according to the exhaust temperature;
in the control mode, determining a target opening corresponding to the current period according to the operation parameter and a preset superheat threshold;
and controlling the supercooling valve to operate according to the target opening degree in the current period.
2. The method of claim 1, wherein the step of determining the control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold includes:
if the exhaust temperature is not greater than the preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is the first control mode; or if the exhaust temperature is greater than the preset temperature threshold, determining that the control mode of the supercooling valve corresponding to the compressor in the current period is the second control mode.
3. The method according to claim 2, wherein the step of determining the target opening corresponding to the current period according to the operation parameter and a preset superheat threshold in the control manner includes:
if the control mode is the first control mode, acquiring a history parameter before the current period; wherein the history parameters include: the method comprises the steps of a first historical parameter corresponding to a previous period, a second historical parameter corresponding to the previous period and a third historical parameter corresponding to the previous period;
and determining a target opening corresponding to the current period according to the history parameter and the superheat threshold.
4. The method of claim 3, wherein the superheat threshold comprises a first superheat threshold, a second superheat threshold, and a third superheat threshold;
the first history parameter includes: the first inner machine superheat degree, the first exhaust superheat degree and the first supercooling valve opening corresponding to the target pipe temperature in the previous period; the second history parameters include: the second inner machine superheat degree, the second exhaust superheat degree and the second supercooling valve opening corresponding to the target pipe temperature in the last period; the third history parameter includes: the third inner machine superheat degree, the third exhaust superheat degree and the third supercooling valve opening corresponding to the target pipe temperature in the last cycle;
The step of determining the target opening corresponding to the current period according to the history parameter and the superheat threshold value comprises the following steps:
and if the first internal machine superheat degree, the second internal machine superheat degree and the third internal machine superheat degree are equal to the first superheat degree threshold, and the first exhaust superheat degree, the second exhaust superheat degree and the third exhaust superheat degree are all larger than the second superheat degree threshold, calculating according to the first subcooling valve opening, the second subcooling valve opening and the third subcooling valve opening to obtain the target opening corresponding to the current period.
5. The method of claim 4, wherein the step of calculating a target opening corresponding to the current cycle from the first subcooling valve opening, the second subcooling valve opening, and the third subcooling valve opening comprises:
the calculation formula of the target opening is as follows:
Pa＝(P1+P2+P3)/3
wherein Pa represents the target opening degree, P1 represents the first subcooling valve opening degree, P2 represents the second subcooling valve opening degree, and P3 represents the third subcooling valve opening degree.
6. The method of claim 4, wherein in the controlling manner, the step of determining the target opening corresponding to the current period according to the operation parameter and a preset superheat threshold value further includes:
And when the control mode is the second control mode, if the exhaust temperature of the current period is smaller than the exhaust temperature of the previous period, the superheat degree of the internal unit in the current period is equal to the third superheat degree threshold, and the exhaust superheat degree of the current period is larger than the second superheat degree threshold, taking the opening of the first supercooling valve corresponding to the target pipe temperature in the previous period as the target opening corresponding to the current period.
7. The method of claim 1, wherein the step of periodically obtaining the operating parameter comprises:
in each period, acquiring the inlet temperature and the outlet temperature of the indoor heat exchanger, and calculating to obtain the superheat degree of the indoor unit according to the inlet temperature and the outlet temperature; and obtaining the saturation temperature corresponding to the high-pressure in the outdoor unit, and calculating the exhaust superheat degree of the compressor in the outdoor unit according to the exhaust temperature and the saturation temperature.
8. The supercooling valve control device is characterized by being applied to a multi-split air conditioner system; the multi-split air conditioner system comprises a plurality of outdoor units and a plurality of indoor units; the device comprises:
The parameter acquisition module is used for periodically acquiring operation parameters after all the outdoor refrigeration operation is performed for a preset time period; wherein the operating parameters include: the superheat degree of the indoor unit corresponding to each running indoor unit, the exhaust temperature and the exhaust superheat degree of the compressor in each outdoor unit, the supercooling valve opening corresponding to a target tube temperature, wherein the target tube temperature is used for representing the minimum tube temperature of the middle tube temperature of the indoor heat exchanger in the indoor unit;
the first determining module is used for determining a control mode of the supercooling valve in the current period according to the exhaust temperature and a preset temperature threshold value; the control method comprises a first control method and a second control method, wherein the first control method is used for representing a method for controlling the supercooling valve according to a preset target supercooling degree, and the second control method is used for representing a method for controlling the supercooling valve according to the exhaust temperature;
the second determining module is used for determining a target opening corresponding to the current period according to the operation parameter and a preset superheat threshold in the control mode;
and the control operation module is used for controlling the supercooling valve to operate according to the target opening degree in the current period.
9. A multi-split system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps of the method of any of the preceding claims 1-7 when the computer program is executed.
10. A computer-readable storage medium, characterized in that it has stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any of the preceding claims 1-7.
CN202311062645.3A 2023-08-21 2023-08-21 Method and device for controlling supercooling valve and multi-split system Pending CN117006660A (en)

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