CN114674063A - Air conditioner control method and device and air conditioner system - Google Patents
Air conditioner control method and device and air conditioner system Download PDFInfo
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- CN114674063A CN114674063A CN202210430740.3A CN202210430740A CN114674063A CN 114674063 A CN114674063 A CN 114674063A CN 202210430740 A CN202210430740 A CN 202210430740A CN 114674063 A CN114674063 A CN 114674063A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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Abstract
The application provides an air conditioner control method, an air conditioner control device and an air conditioner system, and relates to the technical field of air conditioners. Under the refrigerating working condition, the expansion valve of the outdoor unit is adjusted to be in the upper limit opening degree, and meanwhile, the compressor is kept to operate at the first preset frequency, so that more refrigerants in the target outdoor unit can be conveyed into the operation pipeline, and the insufficient operation refrigerant quantity is avoided. In the heating condition, the outdoor unit expansion valve of the target outdoor unit is closed and the compressor is maintained to operate at the second preset frequency, and the refrigerant in the target outdoor unit can be conveyed into the operation pipeline under the driving of the compressor until the suction side pressure is reduced to the first preset pressure value and then stops operating, so that the problem of insufficient operation refrigerant quantity caused by excessive refrigerant stored after the target indoor unit is stopped can be solved. The air conditioner control device and the air conditioner system provided by the embodiment of the application can realize the air conditioner control method.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to an air conditioner control method and device and an air conditioner system.
Background
In an air conditioning system connected with a plurality of outdoor units, when the load on the indoor side is reduced, a part of the running outdoor units may be stopped. If a large amount of refrigerant remains in the heat exchanger or the gas-liquid separator of the stopped outdoor unit after a part of the operating outdoor units are stopped, the amount of refrigerant in operation for cooling or heating may be insufficient, which may easily result in insufficient cooling or heating capacity. At present, after a part of the operating outdoor units of the existing air conditioning system with a plurality of outdoor units are controlled to stop, the quantity of the operating refrigerants is easy to be insufficient.
Disclosure of Invention
The problem that current air conditioning system that has a plurality of off-premises stations leads to the operation refrigerant volume not enough easily after controlling partly operation off-premises station to shut down.
In order to solve the above problem, in a first aspect, the present application provides an air conditioning control method applied to an air conditioning system, where the air conditioning system includes at least two indoor units arranged in parallel and at least two outdoor units arranged in parallel, and the air conditioning control method includes:
determining a part of outdoor units to be closed in at least two running outdoor units as target outdoor units;
under the refrigeration working condition, controlling a compressor of the target outdoor unit to operate at a first preset frequency, adjusting the opening of an outdoor unit expansion valve of the target outdoor unit to be an upper limit opening, and stopping the operation of the compressor and closing the outdoor unit expansion valve after maintaining a first preset time;
and/or in the heating condition, closing an outdoor unit expansion valve of the target outdoor unit, controlling a compressor of the target outdoor unit to operate at a second preset frequency, and stopping the compressor after the suction side pressure of the compressor of the target outdoor unit is reduced to a first preset pressure value.
In the process of controlling the shutdown of the target outdoor unit, under the refrigeration working condition, the expansion valve of the outdoor unit is firstly adjusted to be at the upper limit opening, and meanwhile, the compressor is kept to operate at the first preset frequency, so that more refrigerants in the target outdoor unit can be conveyed into an operation pipeline, and the insufficient operation refrigerant quantity is avoided. In the heating condition, the outdoor unit expansion valve of the target outdoor unit is closed and the compressor is maintained to operate at the second preset frequency, at the moment, the operating refrigerant cannot enter the target outdoor unit through the outdoor unit expansion valve, but the refrigerant in the target outdoor unit is conveyed into the operation pipeline under the driving of the compressor until the suction side pressure is reduced to the first preset pressure value, and then the operation is stopped, so that the problem that the operating refrigerant amount is insufficient due to the fact that excessive refrigerant is stored after the target indoor unit is stopped can be solved.
In an alternative embodiment, the first preset frequency is a lower limit frequency of a compressor of the target outdoor unit, and/or the second preset frequency is a lower limit frequency of a compressor of the target outdoor unit. The selection of the first and second preset frequencies as the lower limit frequencies can avoid a sharp rise in the exhaust side pressure, which is also a transition for the final shutdown.
In an alternative embodiment, the first preset time period is 5s to 20 s.
In an optional embodiment, the first preset pressure value is 0-0.1 MPa.
In an alternative embodiment, the outer fan of the control target outdoor unit is operated at the lower limit rotation speed while the compressor of the control target outdoor unit is operated at the first preset frequency. The outer fan of the target outdoor unit is controlled to operate at the lower limit rotating speed, and the liquefaction of the refrigerant in the target outdoor unit can be reduced, so that the refrigerant stored after the target indoor unit is stopped is reduced, and the sufficient amount of the operating refrigerant is further ensured.
In an optional embodiment, after stopping the operation of the compressor of the target outdoor unit, the air conditioner control method further includes performing a refrigerant adjusting step, where the refrigerant adjusting step includes:
judging whether the running refrigerant quantity of the air conditioning system is excessive or not;
and under the condition that the running refrigerant amount of the air conditioning system is judged to be excessive, controlling the outdoor unit expansion valve of the target outdoor unit to be opened to a first preset opening degree and closed after maintaining a second preset time length.
Therefore, in the embodiment, when the amount of the operating refrigerant is excessive, the outdoor unit expansion valve of the target outdoor unit is adjusted to be opened again to enable a part of the operating pipelines to enter the target outdoor unit, so as to alleviate the problem of excessive amount of the operating refrigerant.
In an alternative embodiment, the first preset opening degree is 40% to 60% of the upper limit opening degree of the outer motor expansion valve.
In an optional embodiment, the second preset time period is 15-30 min. The setting range of the first preset opening degree and the second preset duration is to consider that the running refrigerant quantity may be insufficient due to excessive opening of the outer machine expansion valve or excessive maintaining time, so that a reasonable interval needs to be selected.
In an alternative embodiment, the refrigerant adjusting step is performed at least twice after stopping the operation of the compressor of the target outdoor unit.
In an optional embodiment, under the refrigeration condition, when the air conditioning system meets any one of the following conditions, it is determined that the operating refrigerant quantity of the air conditioning system is excessive:
the opening degree of an indoor unit expansion valve of an operating indoor unit is smaller than a second preset opening degree, the superheat degree of an indoor heat exchanger is smaller than a first superheat degree threshold value, and a third preset time length is maintained;
and the supercooling degree of the outdoor heat exchanger of the running outdoor unit is greater than the first supercooling degree threshold value, and the third preset time length is maintained.
In an optional embodiment, in the heating condition, when the air conditioning system satisfies any one of the following conditions, it is determined that the operating refrigerant quantity of the air conditioning system is excessive:
the frequency of a compressor of the outdoor unit is less than a third preset frequency, the side pressure of the exhaust side is greater than a second preset pressure value, and a fourth preset time is maintained;
the opening degree of an indoor unit expansion valve of the running indoor unit is larger than the third preset opening degree, the supercooling degree of the indoor heat exchanger is larger than the second supercooling degree threshold value, and the fourth preset time length is maintained.
In a second aspect, the present application provides an air conditioning control device, which is applied to an air conditioning system, where the air conditioning system includes at least two indoor units connected in parallel and at least two outdoor units connected in parallel, and the air conditioning control device includes:
the system comprises a confirming module, a control module and a control module, wherein the confirming module is used for confirming that a part of outdoor units to be closed in at least two running outdoor units are target outdoor units;
and the shutdown module is used for controlling the compressor of the target outdoor unit to operate at a first preset frequency under the refrigeration working condition, adjusting the opening of the outdoor unit expansion valve of the target outdoor unit to be an upper limit opening, stopping the operation of the compressor and the outdoor unit expansion valve and closing the outdoor unit expansion valve after maintaining the first preset time, and/or is used for closing the outdoor unit expansion valve of the target outdoor unit and controlling the compressor of the target outdoor unit to operate at a second preset frequency under the refrigeration working condition, and stopping the operation of the compressor after the suction side pressure of the compressor of the target outdoor unit is reduced to a first preset pressure value.
In a third aspect, the present application provides an air conditioning system, including at least two indoor units arranged in parallel and at least two outdoor units arranged in parallel, and further including a controller, where the controller is configured to execute an executable instruction to implement the air conditioning control method in any one of the foregoing embodiments.
Drawings
FIG. 1 is a schematic view of an air conditioning system in a cooling condition according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an air conditioning system in an embodiment of the present application under a heating condition;
FIG. 3 is a flow chart of an embodiment of a method for controlling an air conditioner;
FIG. 4 is a schematic diagram of an air conditioning control unit according to an embodiment of the present application;
fig. 5 is a block diagram of an air conditioning system according to an embodiment of the present application.
Icon: 010-air conditioning systems; 100-an outdoor unit; 110-outdoor heat exchanger; 120-an outer machine expansion valve; 130-a compressor; 140-a gas-liquid separator; 150-a reversing valve; 160-one-way valve; 200-indoor unit; 210-indoor heat exchanger; 220-inner machine expansion valve; 300-running the pipeline; 400-air conditioning control means; 410-a confirmation module; 420-shutdown module; 430-refrigerant adjusting module; 500-a controller; 600-a memory; 700-bus.
Detailed Description
When the load on the indoor side of an air conditioning system connected with a plurality of outdoor units is reduced, one part of the running outdoor units is controlled to stop, and the other part of the running outdoor units maintains the running state. After a part of outdoor units are shut down, a certain amount of refrigerant can be retained in the heat exchangers or gas-liquid separators of the part of outdoor units, the part of refrigerant does not participate in cooling or heating, and the total amount of refrigerant in the system is constant, so if the amount of refrigerant retained in the shut-down outdoor units is too much, the amount of refrigerant participating in circulation is insufficient, and further, the cooling or heating capacity is insufficient.
In order to solve the problem that insufficient operation refrigerant quantity is easily caused when an air conditioning system of a multi-outdoor unit controls a part of operation outdoor units to stop, the embodiment of the application provides an air conditioning control method, and the operation indoor units to be stopped are reasonably controlled in the stopping process, so that the refrigerant quantity stored after the indoor units are stopped is reduced, and the sufficient operation refrigerant quantity is ensured. In addition, the embodiment of the application also provides an air conditioner running device and an air conditioning system.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below.
Fig. 1 is a schematic diagram of an air conditioning system 010 in a cooling condition according to an embodiment of the present application; fig. 2 is a schematic diagram of an air conditioning system 010 in a heating condition according to an embodiment of the present disclosure. The arrows on the lines represent the flow direction of the refrigerant, the upper outdoor unit 100 is in a shutdown state, and the lower outdoor unit 100 is in an operating state. As shown in fig. 1 and 2, the air conditioning system 010 includes at least two indoor units 200 arranged in parallel and at least two outdoor units 100 arranged in parallel, in fig. 1 and 2, two outdoor units 100 and six indoor units 200 are shown, and in other embodiments, the number of the indoor units 200 and the outdoor units 100 may be adjusted. In the present embodiment, each outdoor unit 100 is provided with a compressor 130, a gas-liquid separator 140, an outdoor heat exchanger 110, an outdoor expansion valve 120, a reversing valve 150, and the like. The indoor unit 200 is provided with an indoor heat exchanger 210 and an indoor expansion valve 220. Under the refrigeration condition, the high-temperature and high-pressure gaseous refrigerant output by the compressor 130 firstly passes through the outdoor heat exchanger 110, the gaseous refrigerant is condensed and liquefied in the outdoor heat exchanger 110, then is changed into a low-pressure liquid refrigerant through the outdoor expansion valve 120 and the indoor expansion valve 220, then passes through the indoor heat exchanger 210, is changed into a low-pressure gaseous refrigerant after being subjected to heat absorption and gasification in the indoor heat exchanger 210, then reaches the gas-liquid separator 140, is subjected to gas-liquid separation in the gas-liquid separator 140 (so that the liquid refrigerant is prevented from entering the compressor 130), and finally the low-pressure gaseous refrigerant returns to the compressor 130 to be compressed, so that a cycle is completed. By switching the direction valve 150, it is possible to switch from the cooling operation to the heating operation. Under the heating condition, the high-temperature and high-pressure gaseous refrigerant output by the compressor 130 firstly passes through the indoor heat exchanger 210, the gaseous refrigerant is condensed and liquefied in the indoor heat exchanger 210, then is changed into a low-pressure liquid refrigerant through the indoor expansion valve 220 and the outdoor expansion valve 120, then passes through the outdoor heat exchanger 110, is changed into a low-pressure gaseous refrigerant after absorbing heat and gasifying in the outdoor heat exchanger 110, then reaches the gas-liquid separator 140, is subjected to gas-liquid separation in the gas-liquid separator 140, and finally returns to the compressor 130 for compression, thereby completing a cycle.
Normally, the outdoor unit expansion valve 120 of the shutdown outdoor unit 100 is in a closed state, and the refrigerant in operation is blocked from entering the outdoor heat exchanger 110 through the outdoor unit expansion valve 120, or the refrigerant in the outdoor heat exchanger 110 is blocked from entering the operation line 300 through the outdoor unit expansion valve 120. The refrigerant in the service line 300 is in circulation transport. Normally, the indoor unit expansion valve 220 of the shutdown indoor unit 200 is also closed.
In the embodiment of the present application, the pipeline on the exhaust side of the compressor 130 is provided with the check valve 160, and the check valve 160 prevents the refrigerant from flowing to the compressor 130, especially prevents the refrigerant from flowing into the compressor 130 in the shutdown state.
Fig. 3 is a flowchart illustrating an air conditioner control method according to an embodiment of the present disclosure. The air conditioner control method provided by the embodiment of the application is used for reasonably controlling the running outdoor unit 100 to be closed to stop. As shown in fig. 3, the air conditioner control method according to the embodiment of the present application includes:
step S100, determining a part of outdoor units to be closed as target outdoor units among at least two operating outdoor units.
In this step, the air conditioning system 010 may determine the target outdoor unit 100 according to the received shutdown instruction sent by the user; the target outdoor unit 100 may be determined according to the change in the total load of the indoor units 200. After the target outdoor unit 100 is determined, it is closed in the method of step S200.
Step S200, under the refrigeration working condition, controlling a compressor of a target outdoor unit to run at a first preset frequency, adjusting the opening of an outdoor unit expansion valve of the target outdoor unit to be an upper limit opening, and stopping the running of the compressor and closing the outdoor unit expansion valve after maintaining a first preset time; and/or in the heating condition, closing an outdoor unit expansion valve of the target outdoor unit, controlling a compressor of the target outdoor unit to operate at a second preset frequency, and stopping the compressor after the suction side pressure of the compressor of the target outdoor unit is reduced to a first preset pressure value.
In the embodiment of the present invention, when the target outdoor unit 100 is stopped, the outdoor unit expansion valve 120 is first adjusted to the upper limit opening degree under the cooling condition, and the compressor 130 is kept operating at the first preset frequency, so that more refrigerant in the target outdoor unit 100 can be delivered to the operation pipeline 300, and the amount of the refrigerant is not enough. Specifically, under the cooling condition, the first preset frequency may be a lower limit frequency of the compressor 130 of the target outdoor unit 100, and the first preset time period may be 5s to 20s, for example, 10 s. The selection of the first preset frequency and the second preset frequency as the lower limit frequencies can avoid a sharp rise in the exhaust side pressure, which is also a transition for the final shutdown. The first preset time period is selected to be 5s to 20s, and the compressor 130 can discharge enough refrigerants in the target outdoor unit 100 in the time period.
Further, in the cooling operation, while the compressor 130 of the control target outdoor unit 100 is operated at the first preset frequency, the external fan of the control target outdoor unit 100 is operated at the lower limit rotation speed or stopped. Controlling the external fan of the target outdoor unit 100 to operate or stop operating at the lower limit rotation speed can reduce liquefaction of the refrigerant in the target outdoor unit 100, thereby reducing the amount of the refrigerant stored in the target indoor unit 200 after the shutdown, and further ensuring sufficient amount of the operating refrigerant. The time period during which the outer fan operates at the lower limit rotational speed and the compressor 130 operates at the first preset frequency may be the same, and both are the first preset time period. After the first preset time period is over, the compressor 130 and the external fan of the target outdoor unit 100 stop operating, and the external unit expansion valve 120 is closed.
In the heating operation, the outdoor unit expansion valve 120 of the target outdoor unit 100 is first closed, and the compressor 130 is maintained to operate at the second preset frequency, at this time, the refrigerant in operation cannot enter the target outdoor unit 100 through the outdoor unit expansion valve 120, but the refrigerant in the target outdoor unit 100 is driven by the compressor 130 to be conveyed into the operation pipeline 300, and the operation is stopped until the suction side pressure is reduced to the first preset pressure value, so that the problem of insufficient operation refrigerant amount caused by excessive refrigerant stored in the target indoor unit 200 after the shutdown can be avoided. Optionally, the second preset frequency is a lower limit frequency of the compressor 130 of the target outdoor unit 100. The selection of the second preset frequency as the lower limit frequency can avoid a sharp rise in the exhaust side pressure, which is also a transition for the final shutdown. Optionally, the first preset time period is 5s to 20s, for example, 10 s; the first preset pressure value is 0-0.1 MPa. It can be understood that if the compressor 130 exhausts the refrigerant in the outdoor heat exchanger 110 and the compressor 130 continues to operate when the suction side pressure is too low, the compressor 130 is easily damaged, and therefore, the operation of the compressor 130 is stopped after the suction side pressure of the compressor 130 of the target outdoor unit 100 is reduced to 0-0.1 MPa, and at this time, the target outdoor unit 100 stores less (or exhausts) the refrigerant.
In an optional embodiment, after the operation of the compressor 130 of the target outdoor unit 100 is stopped, the air-conditioning control method further includes performing a refrigerant adjusting step, where the refrigerant adjusting step includes:
step S300, judging whether the running refrigerant quantity of the air conditioning system is excessive or not;
and step S400, under the condition that the running refrigerant amount of the air-conditioning system is judged to be excessive, controlling the outdoor unit expansion valve of the target outdoor unit to be opened to a first preset opening degree and to be closed after maintaining a second preset time length.
When the target outdoor unit 100 is turned off in the shutdown mode in step S200, the operation refrigerant amount may be too large, and the stability of the air conditioning system 010 may be deteriorated due to the too large operation refrigerant amount. Therefore, in the embodiment, when the operation refrigerant amount is excessive, the outdoor unit expansion valve 120 of the target outdoor unit 100 is adjusted to be opened again, so that the refrigerant circulating in a part of the operation pipeline 300 can enter the target outdoor unit 100, thereby alleviating the problem of the excessive operation refrigerant amount. Optionally, the first preset opening degree is 40% to 60%, for example, 50%, of the upper limit opening degree of the outer expansion valve 120; the second preset time period is 15s to 25s, such as 20 s. The setting range of the first preset opening degree and the second preset duration is to consider that the running refrigerant amount may be insufficient due to excessive opening of the outer unit expansion valve 120 or excessive duration, and therefore a reasonable interval needs to be selected.
Alternatively, the refrigerant adjusting step is performed at least twice after stopping the operation of the compressor 130 of the target outdoor unit 100. For example, after the execution of step S400 is completed, step S300 is executed again, and if it is still determined that the operation refrigerant amount is excessive, step S400 is executed again.
Optionally, under the refrigeration condition, under the condition that the air-conditioning system 010 meets any one of the following conditions, it is determined that the operation refrigerant quantity of the air-conditioning system 010 is excessive:
(1) the opening degree of the indoor expansion valve 220 operating the indoor unit 200 is smaller than the second preset opening degree, the superheat degree of the indoor heat exchanger 210 is smaller than the first superheat degree threshold value, and the third preset duration is maintained. Optionally, the second preset opening is 10% of the upper limit opening, the first superheat threshold is 3K, and the third preset time is 20 min.
(2) The supercooling degree of the outdoor heat exchanger 110 of the outdoor unit 100 is greater than the first supercooling degree threshold value and is maintained for a third preset time period. Optionally, the first supercooling degree threshold value is 15K, and the third time duration is 20 min.
If the amount of the operating refrigerant is excessive, the density of the refrigerant in the heat exchanger operating the indoor unit 200 increases, and the refrigerant is not sufficiently gasified due to the decrease in the gaseous refrigerant, thereby decreasing the degree of superheat of the heat exchanger operating the indoor unit 200. The opening degree of the indoor expansion valve 220 is decreased to facilitate increasing the heat exchanger superheat degree to the target superheat degree. However, if the opening degree of the indoor unit expansion valve 220 is decreased to a low level or reaches a lower limit opening degree, it is difficult to control the degree of superheat of the heat exchanger, and the degree of superheat of the heat exchanger is still small. Therefore, the opening degree of the indoor expansion valve 220 for operating the indoor unit 200 is smaller than the second preset opening degree, and the superheat degree of the indoor heat exchanger 210 is smaller than the first superheat degree threshold value, which can be used as a basis for determining that the amount of the operating refrigerant is excessive under the cooling condition. In addition, when the amount of the operation refrigerant is excessive, the density of the refrigerant in the heat exchanger of the operation outdoor unit 100 increases, the ratio of the liquid refrigerant increases, the liquefaction of the gas refrigerant is promoted, and the supercooling degree of the outdoor heat exchanger 110 increases. Therefore, the supercooling degree of the heat exchanger of the outdoor unit 100 is greater than the first supercooling degree threshold value, and the duration of the third preset time period can be used as a basis for judging that the refrigerant is excessive in operation under the refrigeration working condition.
Optionally, in the heating condition, when the air-conditioning system 010 meets any one of the following conditions, it is determined that the operation refrigerant quantity of the air-conditioning system 010 is excessive:
(1) the frequency of operating the compressor 130 of the outdoor unit 100 is less than the third preset frequency, the discharge side pressure is greater than the second preset pressure value, and the fourth preset time period is maintained. Optionally, the third preset frequency is 5% of the upper limit frequency, the second preset pressure value is 0.3MPa, and the fourth preset duration is 20 min.
(2) The opening degree of the indoor unit expansion valve 220 operating the indoor unit 200 is greater than the third preset opening degree, the supercooling degree of the indoor heat exchanger 210 is greater than the second supercooling degree threshold value, and the fourth preset duration is maintained. Optionally, the third preset opening degree is 90% of the upper limit opening degree, the second supercooling degree threshold value is 15K, and the fourth time duration is 20 min.
If the operation refrigerant amount is excessive, the refrigerant density at the discharge side of the compressor 130 increases, and the discharge side pressure increases. In the case where the frequency of the compressor 130 is affected by the discharge-side pressure, the frequency of the compressor 130 may be reduced to lower the discharge-side pressure to the target discharge pressure. If the frequency of the compressor 130 falls to a low level or reaches a lower limit, it is difficult to effectively control the discharge side pressure, which may still be high. Therefore, the frequency of operating the compressor 130 of the outdoor unit 100 is less than the third preset frequency, and the discharge side pressure is greater than the second preset pressure value, which can be used as a basis for determining that the amount of the operating refrigerant is excessive under the heating condition. In addition, if the amount of the operation refrigerant is too large, the density of the refrigerant in the heat exchanger of the operation indoor unit 200 increases, the liquid refrigerant increases, and the supercooling degree at the outlet side of the heat exchanger of the operation indoor unit 200 increases. At this time, the opening degree of the indoor unit expansion valve 220 is increased to reduce the supercooling degree of the heat exchanger of the indoor unit 200 to the target supercooling degree. However, when the opening degree of the indoor unit expansion valve 220 reaches a large level or an upper limit, it is difficult to continuously control the supercooling degree of the heat exchanger, and the supercooling degree of the heat exchanger of the indoor unit 200 is maintained at a high level. Therefore, the opening degree of the indoor expansion valve 220 for operating the indoor unit 200 is greater than the third preset opening degree, and the supercooling degree of the indoor heat exchanger 210 is greater than the second supercooling degree threshold value, which can be used as a basis for determining that the operating refrigerant amount is excessive under the heating condition.
Optionally, an interval time between two refrigerant adjusting steps may be selected to be 20min to 30min, and may be selected to be longer than a third preset time period and a fourth preset time period in the step of determining that the refrigerant amount is excessive, for example, 25 min. Various parameters (various thresholds and duration) adopted in the step of judging the excessive operation refrigerant quantity under different working conditions can be selected according to requirements; of course, other methods in the prior art may be adopted to determine whether the amount of the operating refrigerant is excessive.
In a second aspect, the present application provides an air conditioning control device 400 applied to an air conditioning system 010, the air conditioning system 010 includes at least two indoor units 200 connected in parallel and at least two outdoor units 100 connected in parallel, the air conditioning control device 400 includes:
a confirming module 410, configured to determine, among the at least two operating outdoor units 100, that a part of the outdoor units 100 to be closed is a target outdoor unit 100;
the shutdown module 420 is configured to, under a cooling condition, control the compressor 130 of the target outdoor unit 100 to operate at a first preset frequency, adjust an opening degree of the outdoor unit expansion valve 120 of the target outdoor unit 100 to an upper-limit opening degree, stop the operation of the compressor 130 and the external fan and close the outdoor unit expansion valve 120 after maintaining a first preset time period, and/or, under a heating condition, close the outdoor unit expansion valve 120 of the target outdoor unit 100, control the compressor 130 of the target outdoor unit 100 to operate at a second preset frequency, and stop the operation of the compressor 130 after a suction side pressure of the compressor 130 of the target outdoor unit 100 is reduced to a first preset pressure value.
The determining module 410 and the stopping module 420 are executable computer programs, and when the computer programs are executed, the air conditioner control method in the above embodiments can be implemented, and specific control and adjustment manners can refer to the description of the air conditioner control method, which is not described herein again. The climate control device 400 may further include more modules to achieve more functions, such as a refrigerant adjusting module 430 for performing the refrigerant adjusting step.
Fig. 5 is a block diagram of an air conditioning system 010 according to an embodiment of the present application. As shown in fig. 5, the air conditioning system 010 further includes a controller 500, a memory 600, and a bus 700, wherein the controller 500 is connected to the memory 600 through the bus 700. The controller 500 is configured to execute the executable program stored in the memory 600 to implement the air conditioner control method provided by the above-described embodiment of the present application.
The controller 500 may be an integrated circuit chip having signal processing capabilities. The controller 500 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The methods, steps, and flowchart disclosed in the embodiments of the present application may be implemented or performed.
The memory 600 is used to store a program, such as the air conditioning control apparatus 400 shown in fig. 4. The air conditioner control device 400 includes at least one software function module which can be stored in the memory 600 in the form of software or firmware (firmware) or is solidified in the operating system of the air conditioner system 010, and the controller 500 executes the above program to implement the air conditioner control method disclosed in the above embodiment after receiving the execution instruction. The Memory 600 may be in the form of a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or any other medium capable of storing program codes. In some alternative embodiments, the memory 600 may be integrated with the controller 500, for example, the memory 600 may be integrated with the controller 500 in a chip.
Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present disclosure, and it is intended that the scope of the present disclosure be defined by the appended claims.
Claims (13)
1. An air conditioner control method is applied to an air conditioner system, the air conditioner system comprises at least two indoor units arranged in parallel and at least two outdoor units arranged in parallel, and the air conditioner control method is characterized by comprising the following steps: determining a part of outdoor units to be closed in at least two running outdoor units as target outdoor units;
under the refrigerating working condition, controlling a compressor of the target outdoor unit to operate at a first preset frequency, adjusting the opening of an outdoor unit expansion valve of the target outdoor unit to be an upper-limit opening, and stopping the operation of the compressor and closing the outdoor unit expansion valve after maintaining a first preset time;
and/or in a heating condition, closing an outer machine expansion valve of the target outdoor machine, controlling a compressor of the target outdoor machine to operate at a second preset frequency, and stopping the operation of the compressor after the suction side pressure of the compressor of the target outdoor machine is reduced to a first preset pressure value.
2. The air conditioner control method of claim 1, wherein the first preset frequency is a lower limit frequency of a compressor of the target outdoor unit, and/or the second preset frequency is a lower limit frequency of a compressor of the target outdoor unit.
3. The air conditioner control method according to claim 1, wherein the first preset time period is 5s to 20 s.
4. The air conditioner control method according to claim 1, wherein the first preset pressure value is 0-0.1 MPa.
5. The air conditioner controlling method of claim 1, wherein in a cooling operation, the compressor of the target outdoor unit is controlled to operate at a first preset frequency, and the external fan of the target outdoor unit is controlled to operate at a lower limit rotation speed.
6. The air conditioning control method of any one of claims 1 to 5, further comprising performing a refrigerant adjusting step after stopping an operation of a compressor of the target outdoor unit, the refrigerant adjusting step comprising:
judging whether the running refrigerant quantity of the air conditioning system is excessive or not;
and under the condition that the running refrigerant amount of the air conditioning system is judged to be excessive, controlling an outer machine expansion valve of the target outdoor machine to be opened to a first preset opening degree and closed after maintaining a second preset time length.
7. The method of claim 6, wherein the first predetermined opening degree is 40-60% of an upper limit opening degree of the outdoor unit expansion valve.
8. The air conditioner control method according to claim 6, wherein the second preset time period is 15-30 min.
9. The air conditioner control method of claim 6, wherein the refrigerant adjusting step is performed at least twice after stopping the operation of the compressor of the target outdoor unit.
10. The air conditioner control method according to claim 6, wherein under a cooling condition, the air conditioning system is judged to have an excessive operation refrigerant amount when satisfying any one of the following conditions:
the opening degree of an indoor unit expansion valve of an operating indoor unit is smaller than a second preset opening degree, the superheat degree of an indoor heat exchanger is smaller than a first superheat degree threshold value, and a third preset time length is maintained;
and the supercooling degree of the outdoor heat exchanger of the running outdoor unit is greater than the first supercooling degree threshold value, and the third preset time length is maintained.
11. The air conditioning control method according to claim 6, wherein in the heating condition, it is determined that the operating refrigerant amount of the air conditioning system is excessive when the air conditioning system satisfies any one of the following conditions:
the frequency of a compressor of the outdoor unit is less than a third preset frequency, the side pressure of the exhaust side is greater than a second preset pressure value, and a fourth preset time is maintained;
the opening degree of an indoor unit expansion valve of the running indoor unit is larger than the third preset opening degree, the supercooling degree of the indoor heat exchanger is larger than the second supercooling degree threshold value, and the fourth preset time length is maintained.
12. The utility model provides an air conditioner controlling means, is applied to air conditioning system, air conditioning system includes at least two indoor sets that connect in parallel and at least two off-premises stations that connect in parallel, its characterized in that, air conditioner controlling means includes:
the system comprises a confirming module, a control module and a control module, wherein the confirming module is used for confirming that a part of outdoor units to be closed in at least two running outdoor units are target outdoor units;
and the shutdown module is used for controlling the compressor of the target outdoor unit to operate at a first preset frequency under a refrigeration working condition, adjusting the opening of an outdoor unit expansion valve of the target outdoor unit to be an upper limit opening, stopping the operation of the compressor and closing the outdoor unit expansion valve after maintaining a first preset time, and/or is used for closing the outdoor unit expansion valve of the target outdoor unit and controlling the compressor of the target outdoor unit to operate at a second preset frequency under a heating working condition, and stopping the operation of the compressor after the suction side pressure of the compressor of the target outdoor unit is reduced to a first preset pressure value.
13. An air conditioning system, comprising at least two indoor units arranged in parallel and at least two outdoor units arranged in parallel, and further comprising a controller, wherein the controller is configured to execute executable instructions to implement the air conditioning control method according to any one of claims 1 to 11.
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| CN114674063B (en) | 2023-10-20 |
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