CN110671784B - Air conditioning system refrigerant circulation control method and device and air conditioning system - Google Patents

Air conditioning system refrigerant circulation control method and device and air conditioning system Download PDF

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Publication number
CN110671784B
CN110671784B CN201911031754.2A CN201911031754A CN110671784B CN 110671784 B CN110671784 B CN 110671784B CN 201911031754 A CN201911031754 A CN 201911031754A CN 110671784 B CN110671784 B CN 110671784B
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refrigerant
outdoor unit
target
pressure
target outdoor
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CN110671784A (en
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陈东
任小辉
吉金浩
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • 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
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure

Abstract

The invention provides a method and a device for controlling refrigerant circulation of an air conditioning system and the air conditioning system, wherein the air conditioning system comprises a plurality of outdoor units, and the method for controlling refrigerant circulation of the air conditioning system comprises the following steps: acquiring the refrigerant demand state and pressure of each outdoor unit and the pressure of the refrigerant storage center; and when the outdoor units meet the refrigerant regulation condition, controlling the outdoor units to enter a refrigerant regulation process. According to the refrigerant circulation control method of the air conditioning system, the refrigerant demand state of each outdoor unit in operation is detected in real time, and the magnitude relation between the pressure of the refrigerant storage center and the pressure of the outdoor unit is detected, when the outdoor unit is detected to meet the refrigerant regulation condition, the outdoor unit is automatically controlled to enter the refrigerant regulation process, so that the refrigerant circulation use among different outdoor units is realized, and the phenomenon of uncontrollable refrigerant addition can be avoided.

Description

Air conditioning system refrigerant circulation control method and device and air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling refrigerant circulation of an air conditioning system and the air conditioning system.
Background
With the continuous improvement of the living standard of people, the air conditioner is widely applied.
At present, when a plurality of outdoor units need to add refrigerants, the addition is generally carried out by the length of a pipeline, but the demand amount of the refrigerants is different in different seasons for different outdoor units, the refrigerant adding process is uncontrollable, the amount of the added refrigerants is easily inappropriate, and the use of an air conditioner is influenced.
Disclosure of Invention
The invention solves the problem that the prior multiple outdoor units are easy to cause improper added refrigerant quantity due to uncontrollable refrigerant adding process, thereby influencing the use of the air conditioner.
In order to solve the above problems, the present invention provides a refrigerant circulation control method for an air conditioning system, wherein the air conditioning system includes a plurality of outdoor units, and the plurality of outdoor units are respectively connected to a refrigerant storage center through electromagnetic valves, the method including the steps of:
acquiring the refrigerant demand state and pressure of each outdoor unit and the pressure of the refrigerant storage center;
and when the outdoor units meet the refrigerant regulation condition, controlling the outdoor units to enter a refrigerant regulation process.
Therefore, by detecting the refrigerant demand state of each outdoor unit in the running process in real time and the size relation between the pressure of the refrigerant storage center and the pressure of the outdoor unit, when the outdoor unit is detected to meet the refrigerant adjusting condition, the outdoor unit is automatically controlled to enter the refrigerant adjusting process, so that the refrigerant among different outdoor units is recycled, and the phenomenon that the refrigerant is added uncontrollably can be avoided.
Optionally, the refrigerant regulation condition includes a first regulation condition, where the first regulation condition is: the plurality of outdoor units comprise at least one first target outdoor unit, and the pressure of the refrigerant storage center is smaller than that of each first target outdoor unit; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the first regulation condition, controlling the first target outdoor unit with the highest serial number priority to execute a first control process so as to recycle the refrigerant to the refrigerant storage center.
In this way, when only one first target outdoor unit is detected to meet a first regulation condition, the priority of the serial number of the first target outdoor unit is defaulted to be the highest, and at the moment, the first target outdoor unit is controlled to execute a first control process to enable a refrigerant to flow from the first target outdoor unit to a refrigerant storage center; when a plurality of first target outdoor units meet first regulation conditions, the first target outdoor unit with the highest priority of the control serial number executes a first control process, and the refrigerant flows to the refrigerant storage center from the first target outdoor unit with the highest priority of the serial number, so that the refrigerant is recovered.
Optionally, the refrigerant regulation condition includes a second regulation condition, where the second regulation condition is: the plurality of outdoor units comprise at least one second target outdoor unit, and the pressure of the refrigerant storage center is greater than that of each second target outdoor unit; the second target outdoor unit is the outdoor unit in a state of too little refrigerant in the plurality of outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the second regulation condition, controlling the second target outdoor unit with the highest serial number priority to execute a second control process, so that the refrigerant returns to the second target outdoor unit with the highest serial number priority.
In this way, when only one second target outdoor unit is detected to meet a second regulation condition, the priority of the serial number of the second target outdoor unit is defaulted to be the highest, and at the moment, the second target outdoor unit is controlled to execute a second control process to allow the refrigerant to flow from the refrigerant storage center to the second target outdoor unit; when a plurality of second target outdoor units meet a second regulation condition, the second target outdoor unit with the highest control sequence number priority executes a second control process, and the refrigerant flows from the refrigerant storage center to the second target outdoor unit with the highest sequence number priority, so that the refrigerant storage center supplements the refrigerant for the outdoor units in the state of insufficient refrigerant.
Optionally, the refrigerant regulation condition includes a third regulation condition, where the third regulation condition is: the plurality of outdoor units comprise a first target outdoor unit and a second target outdoor unit, the pressure of the first target outdoor unit is the same as the operation mode of the second target outdoor unit, and the pressure of the first target outdoor unit and the pressure of the second target outdoor unit are both smaller than the pressure of the refrigerant storage center; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
when detecting that the outdoor units meet the third regulation condition, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be opened simultaneously;
acquiring the opening duration of the electromagnetic valve corresponding to the first target outdoor unit or the electromagnetic valve corresponding to the second target outdoor unit, wherein the opening duration is kept in an opening state;
when the opening duration reaches a first preset duration, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be closed simultaneously;
acquiring the pressures of the first target outdoor unit and the second target outdoor unit and the refrigerant demand states of the first target outdoor unit and the second target outdoor unit after a second preset time; the second preset time length is longer than the first preset time length;
when the first target outdoor unit and the second target outdoor unit still meet the third regulation condition, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be opened simultaneously until the first target outdoor unit and the second target outdoor unit meet the third closing condition;
wherein the third off condition is: the pressures of the first target outdoor unit and the second target outdoor unit are equal, or the refrigerant demand state of any one of the first target outdoor unit and the second target outdoor unit reaches a proper state.
Thus, when a plurality of outdoor units meet the third regulation condition, the electromagnetic valves corresponding to the first target outdoor unit and the electromagnetic valves corresponding to the second target outdoor unit are controlled to be opened simultaneously, so that the refrigerant flows from the first target outdoor unit with excessive refrigerant to the second target outdoor unit with insufficient refrigerant under the pressure difference action of the two target outdoor units, the switching of the refrigerant between different outdoor units is realized, the outdoor units are closed after being opened for a first preset time, the pressures of the first target outdoor unit and the second target outdoor unit and the refrigerant demand states of the first target outdoor unit and the second target outdoor unit are detected again after a second preset time, if the third regulation condition is still met, the electromagnetic valves corresponding to the first target outdoor unit and the second target outdoor unit are opened again simultaneously, and the detection is performed in a circulating manner until the pressures of the two target outdoor units are balanced, or when the refrigerant state of any one of the two target outdoor units reaches the refrigerant proper state, controlling the electromagnetic valves corresponding to the two target outdoor units to be closed, so as to complete the refrigerant switching between the different outdoor units in the same operation mode.
Optionally, the refrigerant regulation condition includes a fourth regulation condition, where the fourth regulation condition is: the plurality of outdoor units comprise at least one first target outdoor unit and at least one second target outdoor unit, and the pressure of the refrigerant storage center is greater than the pressure of each second target outdoor unit and less than each first target outdoor unit; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
when detecting that the outdoor units meet the fourth regulation condition, controlling the first target outdoor unit with the highest sequence number priority to execute a first control process; and controlling the second target outdoor unit with the highest sequence number priority to execute a second control process.
Therefore, when the fact that the plurality of first target outdoor units and the plurality of second target outdoor units meet the fourth adjusting condition is detected at the same time, the first target outdoor unit with the highest sequence number priority is controlled to execute the first control process, so that the refrigerant is recycled to the refrigerant storage center from the outdoor units with too many refrigerants, and then the second target outdoor unit with the highest sequence number priority is controlled to execute the second control process, so that the refrigerant flows to the outdoor units with too few refrigerants from the refrigerant storage center, and therefore refrigerant circulation adjustment among the different outdoor units is achieved.
Optionally, the refrigerant adjustment condition includes a fifth adjustment condition, where the fifth adjustment condition is: the plurality of outdoor units comprise at least one first target outdoor unit and at least one second target outdoor unit, and the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both greater than the pressure of the refrigerant storage center; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the fifth regulation condition, controlling the first target outdoor unit with the highest priority of the serial number to execute a first control process.
In this way, when it is detected that the plurality of first target outdoor units and the plurality of second target outdoor units satisfy the fifth adjustment condition, the first target outdoor unit with the highest priority of the control sequence number executes the first control process, so that the refrigerant is recovered from the outdoor unit with excessive refrigerants to the refrigerant storage center, and thus, the refrigerant recovery is realized.
Optionally, the refrigerant adjustment condition includes a sixth adjustment condition, where the sixth adjustment condition is: the plurality of outdoor units comprise at least one first target outdoor unit and at least one second target outdoor unit, and the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both smaller than the pressure of the refrigerant storage center; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the sixth regulation condition, controlling the second target outdoor unit with the highest priority of the serial number to execute a second control process.
In this way, when it is detected that the plurality of outdoor units satisfy the sixth adjustment condition, the second target outdoor unit with the highest priority of the control sequence number executes the second control process, so that the refrigerant flows from the refrigerant storage center to the outdoor unit with too little refrigerant, and the refrigerant storage center replenishes the refrigerant for the outdoor unit with too little refrigerant.
Optionally, when the plurality of outdoor units satisfy a refrigerant regulation condition, controlling the plurality of outdoor units to enter a refrigerant regulation process specifically includes:
when the pressure of the refrigerant storage center is detected to be greater than or equal to a first pressure threshold value, controlling the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center to be opened simultaneously;
acquiring the pressure of the refrigerant storage center;
when the pressure of the refrigerant storage center is smaller than or equal to a second pressure threshold value, controlling the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center to be closed simultaneously; wherein the second pressure threshold is less than the first pressure threshold.
When the pressure of the refrigerant storage center is detected to be greater than or equal to the first pressure threshold, the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center are controlled to be opened simultaneously, so that the refrigerant flows from the refrigerant storage center to the outdoor units, the refrigerant is released, and when the pressure of the refrigerant storage center is reduced from the first pressure threshold to the second pressure threshold, the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center are controlled to be closed simultaneously; therefore, the phenomenon that the refrigerant overflows due to excessive refrigerant recovery of the refrigerant storage center is prevented, and the refrigerant circulation control among the outdoor units is effectively ensured.
Optionally, the first control procedure includes:
controlling the electromagnetic valve corresponding to the first target outdoor unit with the highest priority of the serial number to be opened simultaneously with the electromagnetic valve corresponding to the refrigerant storage center;
acquiring the refrigerant demand state and pressure of the first target outdoor unit with the highest serial number priority and the pressure of the refrigerant storage center;
when the first target outdoor unit with the highest sequence number priority meets a first closing condition, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the refrigerant storage center to be closed simultaneously;
wherein the first shut-down condition is: the pressure of the first target outdoor unit with the highest sequence number priority is equal to the pressure of the refrigerant storage center, or the refrigerant demand state of the first target outdoor unit with the highest sequence number priority reaches a proper state.
Therefore, after the electromagnetic valve corresponding to the first target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center are opened simultaneously, the pressure of the first target outdoor unit with the highest serial number priority is greater than that of the refrigerant storage center, so that the refrigerant flows from the first target outdoor unit with the highest serial number priority to the refrigerant storage center under the action of pressure difference of the first target outdoor unit and the refrigerant storage center, namely, the outdoor units with excessive refrigerants are recycled to the refrigerant storage center, and the refrigerant recycling is realized; in the process, the refrigerant demand state of the first target outdoor unit with the highest serial number priority and the pressures of the first target outdoor unit with the highest serial number priority and the refrigerant storage center are detected in real time, and when the pressures of the first target outdoor unit with the highest serial number priority and the refrigerant storage center are balanced, namely the pressures are equal, or the refrigerant demand state of the first target outdoor unit with the highest serial number priority is gradually adjusted to a refrigerant appropriate state from a refrigerant excess state, the electromagnetic valves corresponding to the first target outdoor unit and the refrigerant storage center are automatically controlled to be closed, so that the adjustment of the refrigerant is completed.
Optionally, the second control procedure includes:
controlling the electromagnetic valve corresponding to the second target outdoor unit with the highest priority of the serial number to be opened simultaneously with the electromagnetic valve corresponding to the refrigerant storage center;
acquiring the refrigerant demand state and pressure of the second target outdoor unit with the highest serial number priority and the pressure of the refrigerant storage center;
when the second target outdoor unit with the highest sequence number priority meets a second closing condition, controlling the electromagnetic valve corresponding to the second target outdoor unit with the highest sequence number priority and the electromagnetic valve corresponding to the refrigerant storage center to be closed simultaneously;
wherein the second shut-off condition is: the pressure of the second target outdoor unit with the highest sequence number priority is equal to the pressure of the refrigerant storage center, or the refrigerant demand state of the second target outdoor unit with the highest sequence number priority reaches a proper state.
Therefore, after the electromagnetic valve corresponding to the second target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center are opened simultaneously, the pressure of the second target outdoor unit with the highest serial number priority is lower than that of the refrigerant storage center at the moment, so that the refrigerant flows from the refrigerant storage center to the second target outdoor unit with the highest serial number priority under the action of pressure difference of the two outdoor units, namely, the refrigerant flows from the refrigerant storage center to the outdoor unit with too little refrigerant, and the refrigerant is supplemented to the outdoor unit with the too little refrigerant in the refrigerant storage center; in the process, the refrigerant demand state of the second target outdoor unit with the highest serial number priority and the pressures of the second target outdoor unit with the highest serial number priority and the refrigerant storage center are detected in real time, and when the pressures of the second target outdoor unit with the highest serial number priority and the refrigerant storage center are balanced, namely the pressures are equal, or the refrigerant demand state of the second target outdoor unit with the highest serial number priority is gradually adjusted to a refrigerant appropriate state from a refrigerant excess state, the electromagnetic valves corresponding to the second target outdoor unit and the refrigerant storage center are automatically controlled to be closed, so that the adjustment of the refrigerant is completed.
In order to solve the above problems, the present invention further provides a refrigerant circulation control device for an air conditioning system, including:
the system comprises an acquisition unit, a storage unit and a control unit, wherein the acquisition unit is used for acquiring the refrigerant demand state and pressure of each outdoor unit and the pressure of the refrigerant storage center;
and the control unit is used for controlling the outdoor units to enter a refrigerant adjusting process when the outdoor units meet the refrigerant adjusting condition.
In order to solve the above problems, the present invention further provides a refrigerant circulation control device for an air conditioning system, including a memory and a processor:
the memory for storing a computer program;
the processor is configured to implement the refrigerant circulation control method of the air conditioning system according to any one of the above descriptions when the computer program is executed.
A computer-readable storage medium storing a computer program, which when read and executed by a processor, implements any of the above-described air conditioning system refrigerant cycle control methods.
In order to solve the above problems, the present invention further provides an air conditioning system, including the above refrigerant circulation control device, a refrigerant storage center, and a plurality of outdoor units, where the plurality of outdoor units are respectively connected to the refrigerant storage center through electromagnetic valves, and the refrigerant circulation control device of the air conditioning system is respectively electrically connected to the electromagnetic valves corresponding to the refrigerant storage center and the electromagnetic valves corresponding to the plurality of outdoor units.
Compared with the prior art, the advantages of the air conditioning system refrigerant circulation control device, the computer readable storage medium, the air conditioning system and the air conditioning system refrigerant circulation control method are the same, and are not repeated herein.
Drawings
FIG. 1 is a flow chart of a refrigerant circulation control method of an air conditioning system according to an embodiment of the present invention;
FIG. 2 is a flowchart of a first control process in the embodiment of the present invention;
FIG. 3 is a flowchart of a second control process in the embodiment of the invention;
FIG. 4 is a block diagram of a refrigerant circulation control device of an air conditioning system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an air conditioning system according to an embodiment of the present invention.
Description of reference numerals:
10-an acquisition unit, 20-a control unit;
3-refrigerant storage center, 31-storage center electromagnetic valve, 32-pressure detection switch, 4-outdoor unit and 41-outdoor unit electromagnetic valve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "high", "low", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, cannot be construed as limiting the present invention.
The outdoor unit of the invention can be connected with one indoor unit or a plurality of indoor units; meanwhile, a refrigerant storage center is arranged, and pressure detection switches are arranged on the refrigerant storage center and each outdoor unit and are respectively used for detecting the pressure of the refrigerant storage center and the pressure of each outdoor unit; the outdoor units are connected in parallel and then connected in series with the refrigerant storage center, the refrigerant storage center and the outdoor units are provided with electromagnetic valves, and all the electromagnetic valves are in a closed state in a normal state and a shutdown state. Thus, the control method of the present invention can control the refrigerant circulation of a plurality of general air conditioners (i.e., one outdoor unit corresponds to one indoor unit), a plurality of multi-split systems (i.e., one outdoor unit corresponds to a plurality of indoor units), and a plurality of multi-split systems (i.e., a plurality of outdoor units correspond to a plurality of indoor units).
Referring to fig. 1, an embodiment of the present invention provides a refrigerant circulation control method for an air conditioning system, where the air conditioning system includes a plurality of outdoor units, and the outdoor units are respectively connected to a refrigerant storage center through electromagnetic valves, including the following steps:
s100, acquiring the refrigerant demand state and pressure of each outdoor unit and the pressure of a refrigerant storage center;
and step S200, when the outdoor units meet the refrigerant regulation condition, controlling the outdoor units to enter a refrigerant regulation process.
The refrigerant demand state of the outdoor unit comprises three states of excessive refrigerant, insufficient refrigerant and refrigerant balance, wherein the excessive refrigerant state means that the amount of the refrigerant cyclically used in the outdoor unit is larger than the amount of the refrigerant required by the outdoor unit in normal operation, namely the supply amount of the refrigerant is larger than the demand amount of the refrigerant; similarly, the refrigerant too-little state means that the amount of the refrigerant cyclically used in the outdoor unit is less than the amount of the refrigerant required by the outdoor unit in normal operation, that is, the supply amount of the refrigerant is less than the demand amount of the refrigerant; the refrigerant balance state means that the amount of refrigerant cyclically used in the outdoor unit is equal to the amount of refrigerant required by the outdoor unit in normal operation, that is, the supply amount of refrigerant is proper and is neither too much nor too little. When the outdoor unit is detected to be in a refrigerant excess state or in a refrigerant deficiency state, the refrigerant circulation in the outdoor unit is abnormal, and the refrigerant circulation quantity of the outdoor unit needs to be adjusted to meet the requirement that the refrigerant in the outdoor unit can be normally recycled, and the adjustment of the refrigerant quantity needs to be carried out according to the size relation between the pressures of the outdoor unit and the refrigerant storage center.
Therefore, by detecting the refrigerant demand state of each outdoor unit in the running process in real time and the size relation between the pressure of the refrigerant storage center and the pressure of the outdoor unit, when the outdoor unit is detected to meet the refrigerant adjusting condition, the outdoor unit is automatically controlled to enter the refrigerant adjusting process, so that the refrigerant among different outdoor units is recycled, and the phenomenon that the refrigerant is added uncontrollably can be avoided.
Optionally, the refrigerant regulation condition includes a first regulation condition, and the first regulation condition is: the plurality of outdoor units comprise at least one first target outdoor unit, and the pressure of the refrigerant storage center is smaller than that of each first target outdoor unit; the first target outdoor unit is an outdoor unit in a state of excessive refrigerants in the outdoor units;
step S200 specifically includes:
when the outdoor units meet the first adjusting condition, the first target outdoor unit with the highest priority of the control sequence number executes a first control process, so that the refrigerant is recycled to the refrigerant storage center.
When a plurality of outdoor units operate simultaneously, when the refrigerant demand state and pressure of each outdoor unit in operation and the pressure of a refrigerant storage center are detected in real time, an outdoor unit which only detects that one refrigerant circulation amount is abnormal may occur at a certain time, and an outdoor unit which detects that a plurality of refrigerant circulation amounts are abnormal may also occur. In this embodiment, only one first target outdoor unit is detected at the current time, or a plurality of first target outdoor units are detected at the same time, and the pressure of the refrigerant storage center is smaller than the pressure of each first target outdoor unit. Since each outdoor unit is preset with a serial number, such as serial numbers 1, 2, 3, etc., the priority of serial number 1 is higher than the priority of serial number 2, that is, when it is detected that the outdoor units corresponding to serial numbers 1 and 2 satisfy the refrigerant regulation condition, the outdoor unit corresponding to serial number 1 is regulated preferentially, the priority of serial number 2 is higher than the priority of serial number 3, and so on, that is, the priority of serial numbers decreases with the increasing of serial numbers. Therefore, for example, when it is detected that the outdoor units of numbers 2, 5, and 7 satisfy the first adjustment condition at the same time, the priority of number 2 is the highest among numbers 2, 5, and 7, and the refrigerant circulation adjustment needs to be performed on the outdoor unit of number 2 first.
In this way, when only one first target outdoor unit is detected to meet a first regulation condition, the priority of the serial number of the first target outdoor unit is defaulted to be the highest, and at the moment, the first target outdoor unit is controlled to execute a first control process to enable a refrigerant to flow from the first target outdoor unit to a refrigerant storage center; when a plurality of first target outdoor units meet first regulation conditions, the first target outdoor unit with the highest priority of the control serial number executes a first control process, and the refrigerant flows to the refrigerant storage center from the first target outdoor unit with the highest priority of the serial number, so that the refrigerant is recovered.
Optionally, as shown in fig. 2, the first control process includes the following steps:
step S310, simultaneously opening an electromagnetic valve corresponding to a first target outdoor unit with the highest control sequence number priority and an electromagnetic valve corresponding to a refrigerant storage center;
step S320, acquiring the refrigerant demand state and pressure of a first target outdoor unit with the highest serial number priority and the pressure of a refrigerant storage center;
step S330, when the first target outdoor unit with the highest serial number priority meets a first closing condition, controlling the electromagnetic valve corresponding to the first target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center to be closed simultaneously;
wherein the first closing condition is: the pressure of the first target outdoor unit with the highest sequence number priority is equal to the pressure of the refrigerant storage center, or the refrigerant demand state of the first target outdoor unit with the highest sequence number priority reaches a refrigerant balance state.
Two of the first closing conditions are parallel conditions, and the condition that is reached first is taken as the first closing condition in the detection, that is, which of the two parallel conditions is reached first is taken as the first closing condition. After the electromagnetic valve corresponding to the first target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center are opened simultaneously, the pressure of the first target outdoor unit with the highest serial number priority is higher than that of the refrigerant storage center, so that the refrigerant flows from the first target outdoor unit with the highest serial number priority to the refrigerant storage center under the action of pressure difference of the first target outdoor unit and the refrigerant storage center, namely, the outdoor units with excessive refrigerants are recycled to the refrigerant storage center, and the refrigerant recycling is realized; in the process, the refrigerant demand state of the first target outdoor unit with the highest serial number priority and the pressures of the first target outdoor unit with the highest serial number priority and the refrigerant storage center are detected in real time, and when the pressures of the first target outdoor unit with the highest serial number priority and the refrigerant storage center are balanced, namely the pressures are equal, or the refrigerant demand state of the first target outdoor unit with the highest serial number priority is gradually adjusted to a refrigerant balance state from a refrigerant excess state, the electromagnetic valves corresponding to the first target outdoor unit and the refrigerant storage center are automatically controlled to be closed, so that the adjustment of the refrigerant is completed.
Therefore, the pressure difference between the first target outdoor unit with the highest serial number priority and the refrigerant storage center is utilized to automatically control the electromagnetic valves corresponding to the first target outdoor unit and the refrigerant storage center to be opened and closed simultaneously, refrigerant circulation regulation of the outdoor units is completed, the regulation process is simple and controllable, and normal operation of the outdoor units is guaranteed.
Optionally, the refrigerant regulation condition includes a second regulation condition, and the second regulation condition is: the plurality of outdoor units comprise at least one second target outdoor unit, and the pressure of the refrigerant storage center is greater than that of each second target outdoor unit; the second target outdoor unit is an outdoor unit in a state of too little refrigerant in the plurality of outdoor units;
at this time, step S200 specifically includes:
and when detecting that the outdoor units meet a second regulation condition, controlling a second target outdoor unit with the highest serial number priority to execute a second control process, so that the refrigerant returns to the second target outdoor unit with the highest serial number priority.
In this embodiment, only one second target outdoor unit is detected at the current time, or a plurality of second target outdoor units are detected at the same time, and the pressure of the refrigerant storage center is greater than the pressure of each second target outdoor unit. When only one second target outdoor unit is detected to meet a second regulation condition, the priority of the serial number of the second target outdoor unit is defaulted to be the highest, and at the moment, the second target outdoor unit is controlled to execute a second control process to enable the refrigerant to flow to the second target outdoor unit from the refrigerant storage center; when a plurality of second target outdoor units meet a second regulation condition, the second target outdoor unit with the highest control sequence number priority executes a second control process, and the refrigerant flows from the refrigerant storage center to the second target outdoor unit with the highest sequence number priority, so that the refrigerant storage center supplements the refrigerant for the outdoor units in the state of insufficient refrigerant.
Optionally, as shown in fig. 3, the second control process includes the following steps:
step S410, simultaneously opening an electromagnetic valve corresponding to a second target outdoor unit with the highest control sequence number priority and an electromagnetic valve corresponding to a refrigerant storage center;
step S420, acquiring the refrigerant demand state and pressure of a second target outdoor unit with the highest serial number priority and the pressure of a refrigerant storage center;
step S430, when the second target outdoor unit with the highest serial number priority meets a second closing condition, controlling the electromagnetic valve corresponding to the second target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center to be closed simultaneously;
wherein the second shut-off condition is: the pressure of the second target outdoor unit with the highest sequence number priority is equal to the pressure of the refrigerant storage center, or the refrigerant demand state of the second target outdoor unit with the highest sequence number priority reaches a refrigerant balance state.
Two conditions of the second closing condition are parallel conditions, and the first condition is the one that is reached first in the detection, that is, the first condition is the one that is reached first in the two parallel conditions. After the electromagnetic valve corresponding to the second target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center are opened simultaneously, because the pressure of the second target outdoor unit with the highest serial number priority is lower than that of the refrigerant storage center at the moment, the refrigerant flows from the refrigerant storage center to the second target outdoor unit with the highest serial number priority under the pressure difference effect of the two, namely flows from the refrigerant storage center to the outdoor unit with too few refrigerants, and the refrigerant storage center supplements the refrigerant for the outdoor unit with the too few refrigerants; in the process, the refrigerant demand state of the second target outdoor unit with the highest serial number priority and the pressures of the second target outdoor unit with the highest serial number priority and the refrigerant storage center are detected in real time, and when the pressures of the second target outdoor unit with the highest serial number priority and the refrigerant storage center are balanced, namely the pressures are equal, or the refrigerant demand state of the second target outdoor unit with the highest serial number priority is gradually adjusted to a refrigerant balance state from a refrigerant excess state, the electromagnetic valves corresponding to the second target outdoor unit and the refrigerant storage center are automatically controlled to be closed, so that the adjustment of the refrigerant is completed.
Therefore, the pressure difference between the second target outdoor unit with the highest serial number priority and the refrigerant storage center is utilized to automatically control the electromagnetic valves corresponding to the second target outdoor unit and the refrigerant storage center to be opened and closed simultaneously, refrigerant circulation regulation of the outdoor units is completed, the regulation process is simple and controllable, and normal operation of the outdoor units is guaranteed.
Optionally, the refrigerant regulation condition includes a third regulation condition, and the third regulation condition is: the multiple outdoor units comprise a first target outdoor unit and a second target outdoor unit, the pressure of the first target outdoor unit is the same as the operation mode of the second target outdoor unit, and the pressure of the first target outdoor unit and the pressure of the second target outdoor unit are both smaller than the pressure of the refrigerant storage center; the first target outdoor unit is an outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is an outdoor unit in a state of insufficient refrigerants in the outdoor units;
at this time, step S200 specifically includes:
step S211, when detecting that the outdoor units meet the third regulation condition, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be opened simultaneously;
step S212, the opening duration of the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit is obtained;
step S213, when the opening duration reaches a first preset duration, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be closed simultaneously;
step S214, obtaining the pressures of the first target outdoor unit and the second target outdoor unit and the refrigerant demand states of the first target outdoor unit and the second target outdoor unit after a second preset time period; the second preset time length is longer than the first preset time length;
step S215, when the first target outdoor unit and the second target outdoor unit still meet the third regulation condition, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be opened simultaneously, and closing the first target outdoor unit and the second target outdoor unit until the first target outdoor unit and the second target outdoor unit meet the third closing condition;
wherein the third closing condition is: the pressures of the first target outdoor unit and the second target outdoor unit are equal, or the refrigerant demand state of any one of the first target outdoor unit and the second target outdoor unit reaches a refrigerant balance state.
In this embodiment, an outdoor unit in a refrigerant excess state and an outdoor unit in a refrigerant deficiency state are detected at the same time, that is, a first target outdoor unit and a second target outdoor unit are detected at the same time at the current time, and both the pressure of the first target outdoor unit and the pressure of the second target outdoor unit are smaller than the pressure of a refrigerant storage center, and the first target outdoor unit and the second target outdoor unit are in the same operation mode; the operation modes are the same, which means that the two target systems are operated in a heating mode or a cooling mode, so that the pressure of the outdoor unit with too much refrigerant is greater than that of the outdoor unit with too little refrigerant. When the outdoor unit is in a state of excessive refrigerants, the pressure of the outdoor unit is higher, namely the pressure of the outdoor unit is high, and when the outdoor unit is in a state of insufficient refrigerants, the pressure of the outdoor unit is lower, namely the pressure of the outdoor unit is low; when the operation modes of the two target outdoor units are different, namely one outdoor unit operates in the heating mode and the other outdoor unit operates in the cooling mode, the low pressure in the cooling mode is higher than the high pressure in the heating mode easily in summer, and if refrigerant circulation adjustment is performed at the moment, the refrigerant flows from the outdoor unit with too little refrigerant to the outdoor unit with too much refrigerant, so that the refrigerant circulation adjustment is influenced. The first preset time and the second preset time are both program setting values, and can be set according to actual needs, and the first preset time is smaller than the second preset time, and usually the first preset time is set to 5S, and the second preset time is set to 10 min.
When detecting that the outdoor units meet the third regulation condition, controlling the electromagnetic valves corresponding to the first target outdoor unit and the electromagnetic valves corresponding to the second target outdoor unit to be opened simultaneously, so that the refrigerant flows from the first target outdoor unit with excessive refrigerant to the second target outdoor unit with insufficient refrigerant under the pressure difference action of the two target systems, realizing the switching of the refrigerant between different outdoor units, closing the outdoor units after opening for a first preset time, detecting the pressures of the first target outdoor unit and the second target outdoor unit and the refrigerant demand states of the first target outdoor unit and the second target outdoor unit again after a second preset time, if the third regulation condition is still met, simultaneously opening the electromagnetic valves corresponding to the first target outdoor unit and the second target outdoor unit again, and performing cycle detection until the pressures of the two target systems are balanced, or, when the refrigerant state of any one of the two target systems reaches the appropriate refrigerant state, the electromagnetic valves corresponding to the two target systems are controlled to be closed, so that the refrigerant switching between the different outdoor units in the same operation mode is completed.
Optionally, the refrigerant regulation condition includes a fourth regulation condition, and the fourth regulation condition is: the plurality of outdoor units comprise a plurality of first target outdoor units and a plurality of second target outdoor units, and the pressure of the refrigerant storage center is greater than the pressure of each second target outdoor unit and smaller than each first target outdoor unit; the first target outdoor unit is an outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is an outdoor unit in a state of insufficient refrigerants in the outdoor units;
at this time, step S200 specifically includes:
when detecting that the outdoor units meet the fourth regulation condition, controlling a first target outdoor unit with the highest sequence number priority to execute a first control process; and then controlling the second target outdoor unit with the highest sequence number priority to execute a second control process.
In this embodiment, a plurality of first target outdoor units and a plurality of second target outdoor units are detected at the same time, and the pressure of the refrigerant storage center is greater than the pressure of each of the second target outdoor units and less than that of each of the first target outdoor units. At this time, the first target outdoor unit with the highest sequence number priority is controlled to execute the first control process, so that the refrigerant is recovered to the refrigerant storage center from the outdoor unit with too many refrigerants, and then the second target outdoor unit with the highest sequence number priority is controlled to execute the second control process, so that the refrigerant flows to the outdoor unit with too few refrigerants from the refrigerant storage center, and thus, the refrigerant circulation regulation among different outdoor units is realized.
Optionally, the refrigerant regulation condition includes a fifth regulation condition, and the fifth regulation condition is: the outdoor units comprise at least one first target outdoor unit and at least one second target outdoor unit, and the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both greater than the pressure of the refrigerant storage center; the first target outdoor unit is an outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is an outdoor unit in a state of insufficient refrigerants in the outdoor units;
at this time, step S200 specifically includes:
and when detecting that the outdoor units meet the fifth regulation condition, executing a first control process by a first target outdoor unit with the highest control sequence number priority.
In this embodiment, a plurality of first target outdoor units and a plurality of second target outdoor units are detected at the same time, and the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both greater than the pressure of the refrigerant storage center. At this time, the first target outdoor unit with the highest priority of the control serial number executes the first control process, so that the refrigerant is recovered to the refrigerant storage center from the outdoor unit with too many refrigerants, and thus, the recovery of the refrigerant is realized.
Optionally, the refrigerant regulation condition includes a sixth regulation condition, and the sixth regulation condition is: the system comprises a plurality of outdoor units, at least one first target outdoor unit and at least one second target outdoor unit, wherein the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both smaller than the pressure of a refrigerant storage center; the first target outdoor unit is an outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is an outdoor unit in a state of insufficient refrigerants in the outdoor units;
at this time, step S200 specifically includes:
and when detecting that the outdoor units meet the sixth regulation condition, executing a second control process by a second target outdoor unit with the highest control sequence number priority.
In this embodiment, a plurality of first target outdoor units and a plurality of second target outdoor units are detected at the same time, and the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both smaller than the pressure of the refrigerant storage center. At this time, the second target outdoor unit with the highest priority of the control sequence number executes a second control process, so that the refrigerant flows from the refrigerant storage center to the outdoor unit with too little refrigerant, and thus the refrigerant storage center replenishes the refrigerant for the outdoor unit with too little refrigerant.
Optionally, step S200 specifically includes:
step S231, when the pressure of the refrigerant storage center is detected to be greater than or equal to a first pressure threshold value, controlling the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center to be opened simultaneously;
step S232, acquiring the pressure of a refrigerant storage center;
step 233, when the pressure of the refrigerant storage center is less than or equal to the second pressure threshold, controlling the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center to be closed at the same time; wherein the second pressure threshold is less than the first pressure threshold.
The first pressure threshold and the second pressure threshold are both programmed values, and the first pressure threshold is usually set to 90% of the maximum design pressure, which is the pressure at the full load of the refrigerant storage center and is the pressure limit value set when the refrigerant storage center is designed, and the second pressure threshold is usually set to 70% of the maximum design pressure. In this embodiment, it is detected at the present moment that the pressure of the refrigerant storage center is greater than or equal to the first pressure threshold, which indicates that the refrigerant in the refrigerant storage center is too much at the present moment, and the refrigerant storage volume is close to the maximum design capacity, at this moment, the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center are controlled to be simultaneously opened, so that the refrigerant flows from the refrigerant storage center to the outdoor units, thereby releasing the refrigerant, and when the pressure of the refrigerant storage center is reduced from the first pressure threshold to the second pressure threshold, the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center are controlled to be simultaneously closed. Therefore, the phenomenon that the refrigerant overflows due to excessive refrigerant recovery of the refrigerant storage center can be prevented, and the refrigerant circulation control among the outdoor units is effectively ensured.
In another embodiment of the present invention, a computer-readable storage medium is provided, which stores instructions that when loaded and executed by a processor implement any of the above methods for controlling refrigerant circulation of an air conditioning system.
The technical solution of the embodiment of the present invention substantially or partly contributes to the prior art, or all or part of the technical solution may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiment of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
By the method for controlling the refrigerant circulation of the air conditioning system, when the outdoor unit meets the refrigerant regulation condition, the outdoor unit is automatically controlled to enter the refrigerant regulation process to realize the refrigerant circulation use among different outdoor units by detecting the refrigerant demand state of each outdoor unit in the running process in real time and the magnitude relation between the pressure of the refrigerant storage center and the pressure of the outdoor unit, so that the phenomenon of uncontrollable refrigerant addition can be avoided.
Referring to fig. 4, in another embodiment of the present invention, a refrigerant circulation control device for an air conditioning system includes:
an obtaining unit 10, configured to obtain a refrigerant demand state and pressure of each outdoor unit, and a pressure of a refrigerant storage center;
the control unit 20 is configured to control the outdoor units to enter a refrigerant adjusting process when the outdoor units meet the refrigerant adjusting condition.
In this way, the acquisition unit 10 detects the refrigerant demand state of each outdoor unit in real time during operation and the magnitude relation between the pressure of the refrigerant storage center and the pressure of the outdoor unit, and transmits the detected pressure data and the refrigerant demand state data to the control unit 20, the control unit 20 processes and analyzes the received data, and when the outdoor unit is detected to meet the refrigerant regulation condition, the control unit controls the outdoor unit to enter the refrigerant regulation process, so that the refrigerant circulation between different outdoor units is realized, and the phenomenon that the refrigerant is added uncontrollable can be avoided.
In another embodiment of the present invention, a refrigerant circulation control device for an air conditioning system includes a memory and a processor:
a memory for storing a computer program;
and a processor configured to implement the method for controlling refrigerant circulation of the outdoor units as described above when the computer program is executed.
In addition, the air conditioning system refrigerant circulation control device in the present embodiment is a computer device.
In another embodiment of the present invention, an air conditioning system is provided, which includes the refrigerant circulation control device of the air conditioning system, a refrigerant storage center and a plurality of outdoor units, wherein the plurality of outdoor units are respectively connected to the refrigerant storage center through electromagnetic valves, and the refrigerant circulation control device of the air conditioning system is respectively electrically connected to the electromagnetic valves corresponding to the plurality of outdoor units.
Referring to fig. 5, the air conditioning system including three outdoor units is exemplified in the present embodiment. Namely, the air conditioning system comprises a refrigerant storage center 3 and three outdoor units 4, and the three outdoor units 4 are connected in parallel and then connected in series with the refrigerant storage center 3; the refrigerant storage center 3 is provided with a storage center electromagnetic valve 31 and a pressure detection switch 32, the pressure detection switch 32 is used for detecting the pressure of the refrigerant storage center 3, and the storage center electromagnetic valve 31 is arranged on a pipeline connecting the refrigerant storage center 3 and the outdoor unit 4; each outdoor unit 4 may be connected to one or more indoor units (not shown), each outdoor unit 4 is connected to the refrigerant storage center 3 in series through an outdoor unit electromagnetic valve 41, and the storage center electromagnetic valve 31 and each outdoor unit electromagnetic valve 41 are electrically connected to the computer device. The storage center solenoid valve 31 and each of the outdoor unit solenoid valves 41 are in a closed state in a normal state and a shutdown state, wherein the normal state is a state when the amount of refrigerant in the outdoor unit is appropriate and the refrigerant circulation control is not required, and at this time, the outdoor unit is also in a refrigerant balance state, and the shutdown state is a state when the outdoor unit stops operating.
In this way, in the refrigerant circulation adjusting process, the opening and closing of the outer unit electromagnetic valve 41 and the storage center electromagnetic valve 31 are controlled, so that the refrigerant is adjusted between the refrigerant storage center 3 and the outdoor unit 4 or between the two outdoor units 4, the refrigerant circulation use between different outdoor units is realized, and the phenomenon of uncontrollable refrigerant addition can be avoided.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (13)

1. A refrigerant circulation control method of an air conditioning system comprises a plurality of outdoor units, wherein the outdoor units are respectively connected with a refrigerant storage center through electromagnetic valves, and the refrigerant circulation control method is characterized by comprising the following steps:
acquiring the refrigerant demand state and pressure of each outdoor unit and the pressure of the refrigerant storage center;
when the outdoor units meet the refrigerant regulation condition, controlling the outdoor units to enter a refrigerant regulation process;
the refrigerant regulation conditions comprise first regulation conditions, and the first regulation conditions are as follows: the plurality of outdoor units comprise at least one first target outdoor unit, and the pressure of the refrigerant storage center is smaller than that of each first target outdoor unit; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the first regulation condition, controlling the first target outdoor unit with the highest serial number priority to execute a first control process so as to recycle the refrigerant to the refrigerant storage center.
2. The refrigerant cycle control method of claim 1, wherein the refrigerant regulation condition comprises a second regulation condition, and the second regulation condition is: the plurality of outdoor units comprise at least one second target outdoor unit, and the pressure of the refrigerant storage center is greater than that of each second target outdoor unit; the second target outdoor unit is the outdoor unit in a state of too little refrigerant in the plurality of outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the second regulation condition, controlling the second target outdoor unit with the highest serial number priority to execute a second control process, so that the refrigerant returns to the second target outdoor unit with the highest serial number priority.
3. The refrigerant cycle control method of claim 1, wherein the refrigerant regulation condition comprises a third regulation condition, and the third regulation condition is: the plurality of outdoor units comprise a first target outdoor unit and a second target outdoor unit, the pressure of the first target outdoor unit is the same as the operation mode of the second target outdoor unit, and the pressure of the first target outdoor unit and the pressure of the second target outdoor unit are both smaller than the pressure of the refrigerant storage center; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
when detecting that the outdoor units meet the third regulation condition, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be opened simultaneously;
acquiring the opening duration of the electromagnetic valve corresponding to the first target outdoor unit or the electromagnetic valve corresponding to the second target outdoor unit, wherein the opening duration is kept in an opening state;
when the opening duration reaches a first preset duration, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be closed simultaneously;
acquiring the pressures of the first target outdoor unit and the second target outdoor unit and the refrigerant demand states of the first target outdoor unit and the second target outdoor unit after a second preset time; the second preset time length is longer than the first preset time length;
when the first target outdoor unit and the second target outdoor unit still meet the third regulation condition, controlling the electromagnetic valve corresponding to the first target outdoor unit and the electromagnetic valve corresponding to the second target outdoor unit to be opened simultaneously until the first target outdoor unit and the second target outdoor unit meet the third closing condition;
wherein the third off condition is: the pressures of the first target outdoor unit and the second target outdoor unit are equal, or the refrigerant demand state of any one of the first target outdoor unit and the second target outdoor unit reaches a refrigerant balance state.
4. The refrigerant cycle control method of claim 1, wherein the refrigerant regulation condition comprises a fourth regulation condition, and the fourth regulation condition is: the plurality of outdoor units comprise a plurality of first target outdoor units and a plurality of second target outdoor units, and the pressure of the refrigerant storage center is greater than the pressure of each second target outdoor unit and less than the pressure of each first target outdoor unit; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
when detecting that the outdoor units meet the fourth regulation condition, controlling the first target outdoor unit with the highest sequence number priority to execute a first control process; and controlling the second target outdoor unit with the highest sequence number priority to execute a second control process.
5. The refrigerant circulation control method of an air conditioning system as claimed in claim 1, wherein the refrigerant adjusting conditions include a fifth adjusting condition, and the fifth adjusting condition is: the plurality of outdoor units comprise at least one first target outdoor unit and at least one second target outdoor unit, and the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both greater than the pressure of the refrigerant storage center; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the fifth regulation condition, controlling the first target outdoor unit with the highest priority of the serial number to execute a first control process.
6. The refrigerant cycle control method of claim 1, wherein the refrigerant adjusting conditions include a sixth adjusting condition, and the sixth adjusting condition is: the plurality of outdoor units comprise at least one first target outdoor unit and at least one second target outdoor unit, and the pressure of each first target outdoor unit and the pressure of each second target outdoor unit are both smaller than the pressure of the refrigerant storage center; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units, and the second target outdoor unit is the outdoor unit in a state of insufficient refrigerants in the outdoor units;
when the plurality of outdoor units meet the refrigerant regulation condition, the method for controlling the plurality of outdoor units to enter the refrigerant regulation process specifically comprises the following steps:
and when detecting that the outdoor units meet the sixth regulation condition, controlling the second target outdoor unit with the highest priority of the serial number to execute a second control process.
7. The method of claim 1, wherein the controlling the plurality of outdoor units to enter a refrigerant conditioning process when the plurality of outdoor units satisfy a refrigerant conditioning condition comprises:
when the pressure of the refrigerant storage center is detected to be greater than or equal to a first pressure threshold value, controlling the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center to be opened simultaneously;
acquiring the pressure of the refrigerant storage center;
when the pressure of the refrigerant storage center is smaller than or equal to a second pressure threshold value, controlling the electromagnetic valves corresponding to the outdoor units and the electromagnetic valves corresponding to the refrigerant storage center to be closed simultaneously; wherein the second pressure threshold is less than the first pressure threshold.
8. The method as claimed in claim 1, 4 or 5, wherein the first control process comprises:
controlling the electromagnetic valve corresponding to the first target outdoor unit with the highest priority of the serial number to be opened simultaneously with the electromagnetic valve corresponding to the refrigerant storage center;
acquiring the refrigerant demand state and pressure of the first target outdoor unit with the highest serial number priority and the pressure of the refrigerant storage center;
when the first target outdoor unit with the highest serial number priority meets a first closing condition, controlling the electromagnetic valve corresponding to the first target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center to be closed simultaneously;
wherein the first shut-down condition is: the pressure of the first target outdoor unit with the highest sequence number priority is equal to the pressure of the refrigerant storage center, or the refrigerant demand state of the first target outdoor unit with the highest sequence number priority reaches a refrigerant balance state.
9. The method as claimed in claim 2, 4 or 6, wherein the second control process comprises:
controlling the electromagnetic valve corresponding to the second target outdoor unit with the highest priority of the serial number to be opened simultaneously with the electromagnetic valve corresponding to the refrigerant storage center;
acquiring the refrigerant demand state and pressure of the second target outdoor unit with the highest serial number priority and the pressure of the refrigerant storage center;
when the second target outdoor unit with the highest serial number priority meets a second closing condition, controlling the electromagnetic valve corresponding to the second target outdoor unit with the highest serial number priority and the electromagnetic valve corresponding to the refrigerant storage center to be closed simultaneously;
wherein the second shut-off condition is: the pressure of the second target outdoor unit with the highest sequence number priority is equal to the pressure of the refrigerant storage center, or the refrigerant demand state of the second target outdoor unit with the highest sequence number priority reaches a refrigerant balance state.
10. A refrigerant circulation control device of an air conditioning system comprises:
the system comprises an acquisition unit (10) and a control unit, wherein the acquisition unit is used for acquiring the refrigerant demand state and pressure of each outdoor unit and the pressure of a refrigerant storage center;
the control unit (20) is used for controlling the outdoor units to enter a refrigerant regulation process when the outdoor units meet the refrigerant regulation condition;
the refrigerant regulation conditions comprise first regulation conditions, and the first regulation conditions are as follows: the plurality of outdoor units comprise at least one first target outdoor unit, and the pressure of the refrigerant storage center is smaller than that of each first target outdoor unit; the first target outdoor unit is the outdoor unit in a state of excessive refrigerants in the outdoor units;
the control unit (20) is configured to control the outdoor units to enter a refrigerant regulation process when the outdoor units meet a refrigerant regulation condition, and specifically includes: the control unit (20) is configured to, when it is detected that the plurality of outdoor units satisfy the first adjustment condition, control the first target outdoor unit having the highest priority of the serial number to perform a first control process, so that the refrigerant is recovered to the refrigerant storage center.
11. The refrigerant circulation control device of the air conditioning system is characterized by comprising a memory and a processor:
the memory for storing a computer program;
the processor is configured to implement the method for controlling refrigerant circulation of an air conditioning system according to any one of claims 1 to 9 when executing the computer program.
12. An air conditioning system, comprising the refrigerant circulation control device of claim 11, a refrigerant storage center, and a plurality of outdoor units, wherein the plurality of outdoor units are respectively connected to the refrigerant storage center through electromagnetic valves, and the refrigerant circulation control device of the air conditioning system is respectively electrically connected to the electromagnetic valves corresponding to the plurality of outdoor units.
13. A computer-readable storage medium storing a computer program, which when read and executed by a processor, implements the method of controlling refrigerant circulation of an air conditioning system according to any one of claims 1 to 9.
CN201911031754.2A 2019-10-28 2019-10-28 Air conditioning system refrigerant circulation control method and device and air conditioning system Active CN110671784B (en)

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