CN113405155A - Expansion valve control method and device and multi-connected air conditioner - Google Patents
Expansion valve control method and device and multi-connected air conditioner Download PDFInfo
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- CN113405155A CN113405155A CN202110745475.3A CN202110745475A CN113405155A CN 113405155 A CN113405155 A CN 113405155A CN 202110745475 A CN202110745475 A CN 202110745475A CN 113405155 A CN113405155 A CN 113405155A
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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
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
- 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/40—Damper positions, e.g. open or closed
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- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application provides an expansion valve control method and device and a multi-connected air conditioner, and relates to the technical field of air conditioners. The expansion valve control method comprises the steps of judging whether the ratio of the total capacity of all target indoor units to the total capacity of all indoor units in operation at present reaches a preset ratio, and if the ratio reaches the preset ratio, controlling the expansion valves of all the target indoor units to sequentially execute corresponding closing or opening actions according to the priority of all the target indoor units. Therefore, the closing or opening actions of the expansion valves of the target indoor units with larger total capacity are performed in sequence rather than simultaneously, so that the overlarge pressure fluctuation of the multi-connected air conditioning system in a short time is avoided, the stability of system operation is improved, and the use experience of a user is improved. The expansion valve control device and the multi-connected air conditioner are used for achieving the expansion valve control method.
Description
Technical Field
The application relates to the technical field of air conditioners, in particular to an expansion valve control method and device and a multi-connected air conditioner.
Background
When part (a plurality of) indoor units need to be closed or opened simultaneously during heating operation of the multi-split air conditioner, the electronic expansion valves of the indoor units are closed to the minimum opening degree simultaneously or are opened from the minimum opening degree to the target opening degree. When the electronic expansion valves of multiple indoor units are simultaneously closed or opened, the system parameters may fluctuate greatly, for example, the pressure and temperature on the exhaust side of the compressor may fluctuate greatly, which may affect the stability of the air conditioner operation in severe cases.
Disclosure of Invention
The problem that this application will improve is the relatively poor problem of operating stability of current multiple air conditioner.
In order to solve the above problem, in a first aspect, the present application provides an expansion valve control method, which is applied to a multi-split air conditioner, and the expansion valve control method includes:
determining a plurality of target indoor units, wherein the target indoor units are a plurality of indoor units which need to close the expansion valve at the same time or a plurality of indoor units which need to open the expansion valve at the same time;
judging whether the ratio of the total capacity of all target indoor units to the total capacity of all indoor units in operation at present reaches a preset ratio or not;
if yes, determining the priority of each target indoor unit, and controlling the expansion valve of each target indoor unit to sequentially execute corresponding closing or opening actions according to the priority of each target indoor unit.
In the embodiment of the present application, if the ratio of the total capacity of the target indoor units that need to close or open the expansion valves at the same time to the total capacity of all the operating indoor units is large, closing or opening the expansion valves of multiple target indoor units at the same time easily causes large system pressure fluctuation. Therefore, the expansion valve control method in the embodiment of the present application includes determining whether a ratio of a total capacity of all target indoor units to a total capacity of all currently operating indoor units reaches a preset ratio, and if the ratio reaches the preset ratio, controlling the expansion valves of the target indoor units to sequentially perform corresponding closing or opening actions according to priorities of the target indoor units. Therefore, the closing or opening actions of the expansion valves of the target indoor units with larger total capacity are performed in sequence rather than simultaneously, the overlarge pressure fluctuation of the multi-connected air conditioning system in a short time is avoided, and the running stability of the system is improved. The system operation stability is improved, the fluctuation of the air outlet temperature can be reduced, the phenomenon of mistaken defrosting, the phenomenon that the exhaust temperature is too high and the exhaust temperature enters a protection state and the like are not easy to occur, and therefore the use experience of a user is also improved.
In an optional embodiment, the step of determining the priority of each target indoor unit includes:
and determining the priority of each target indoor unit according to the reference characteristics of each target indoor unit, wherein the reference characteristics comprise at least one of a windshield, capacity, temperature difference between the ambient temperature and the target temperature, a communication address and an authority level.
In an alternative embodiment, when the target indoor units are a plurality of indoor units that simultaneously need to close the expansion valve:
when the reference characteristics comprise the windshield, the higher the windshield of the target indoor unit is, the lower the priority of the target indoor unit is;
when the reference characteristic comprises the temperature difference between the environment temperature and the target temperature, the larger the temperature difference between the environment temperature and the target temperature corresponding to the target indoor unit is, the lower the priority is;
when the reference characteristics include capacity, the larger the capacity of the target indoor unit, the higher its priority.
In the heating process, because the indoor unit with the high windshield can ensure sufficient air volume, the gaseous refrigerant of the indoor unit is quickly condensed into the liquid refrigerant, the high-pressure quick rise is avoided, the air volume of the indoor unit with the low windshield is small, and if the high-temperature gaseous refrigerant can not be effectively radiated, the high pressure and the exhaust temperature of the system are easily caused to rise. Therefore, the expansion valve of the indoor unit with the high windshield is closed later, and the expansion valve of the indoor unit with the low windshield is closed first. The difference between the ambient temperature and the target temperature is large, which means that the heating demand in the room is large, whereas the difference is small, which means that the heating load in the room is small. The expansion valve corresponding to the indoor unit with small temperature difference is closed preferentially, and the requirements of users are met better. And the expansion valve corresponding to the indoor unit with large temperature difference is closed later, so that the heat of the heat exchanger can be dissipated in time, and the high pressure of the system is prevented from rising rapidly. The indoor unit with large capacity has a large influence on other indoor units, so that the expansion valve of the target indoor unit with large capacity should be closed when the total capacity of the indoor units is large during operation, so that the change proportion of the total capacity of the indoor units during operation is relatively small. If the expansion valve of the target indoor unit with large capacity is closed, the change of the total capacity of the indoor unit in operation is larger. Therefore, when the expansion valve of the target indoor unit needs to be closed, the influence of the indoor unit with large capacity on the system parameters can be reduced by closing the indoor unit with high priority.
In an alternative embodiment, when the target indoor unit is a plurality of indoor units that simultaneously require opening of the expansion valve:
when the reference characteristics comprise the windshield, the higher the windshield of the target indoor unit is, the higher the priority of the target indoor unit is;
when the reference characteristic comprises the temperature difference between the environment temperature and the target temperature, the larger the temperature difference between the environment temperature and the target temperature corresponding to the target indoor unit is, the higher the priority is;
when the reference characteristics include capacity, the larger the capacity of the target indoor unit, the lower its priority.
In contrast to the case where the target indoor unit is a plurality of indoor units that simultaneously need to close the expansion valve, when a plurality of indoor units need to be opened simultaneously, the above-described reference characteristics have opposite effects on the priority, that is, the higher the damper is, the higher the priority thereof is; the larger the temperature difference is, the higher the priority is; the larger the capacity, the lower its priority.
In an optional embodiment, the step of determining the priority of each target indoor unit by referring to a plurality of characteristics including a communication address includes:
determining the first priority of each target indoor unit according to other characteristics except the communication address;
and if a plurality of target indoor units with the same first priority exist, determining a second priority among the plurality of target indoor units with the same first priority according to the communication address.
When the priorities of the target indoor units cannot be distinguished through the windshield, the temperature difference between the target temperature and the ambient temperature and the capacity, the priorities can be determined according to the communication addresses, for example, the priorities are automatically sorted according to the communication address sequence of the target indoor units.
In an alternative embodiment, the time interval for controlling the expansion valves of the target indoor units to sequentially perform the corresponding closing or opening operations is 1s to 10 s. The system pressure fluctuation caused by the opening and closing of the expansion valve can be alleviated by setting a certain time interval.
In an alternative embodiment, the predetermined ratio is 40% to 60%.
In an optional embodiment, the plurality of indoor units that need to close the expansion valve at the same time include an indoor unit that receives a shutdown instruction and an indoor unit that is shut down when reaching a temperature; and the indoor units which need to open the expansion valves at the same time comprise the indoor unit which receives a starting instruction and the indoor unit which quits from the temperature-reaching shutdown.
In an optional embodiment, if the ratio of the total capacity of all the target indoor units to the total capacity of all the currently operating indoor units does not reach the preset ratio, the expansion valves of the target indoor units are controlled to simultaneously execute corresponding closing or opening actions.
In a second aspect, the present application provides an expansion valve control device for a multi-split air conditioner, the expansion valve control device comprising:
the system comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a plurality of target indoor units, and the target indoor units are a plurality of indoor units which need to close expansion valves at the same time or a plurality of indoor units which need to open the expansion valves at the same time;
the judging module is used for judging whether the ratio of the total capacity of all target indoor units to the total capacity of all indoor units in current operation reaches a preset ratio or not;
and the execution module is used for determining the priority of each target indoor unit under the condition that the ratio of the total capacity of all target indoor units to the total capacity of all indoor units in current operation reaches a preset ratio, and controlling the expansion valves of all target indoor units to sequentially execute corresponding closing or opening actions according to the priority of each target indoor unit.
In a third aspect, the present application provides a multi-connected air conditioner comprising a controller configured to execute an executable program to implement the expansion valve control method in the embodiment of any one of the first aspect.
Drawings
Fig. 1 is a schematic diagram of a partial pipeline of a multi-connected air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a block diagram of a multi-split air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a method for controlling an expansion valve according to an embodiment of the present disclosure;
FIG. 4 is a schematic illustration of an expansion valve control apparatus according to an embodiment of the present application;
fig. 5 is a block diagram of a multi-connected air conditioner according to an embodiment of the present disclosure.
Description of reference numerals: 010-multi-connected air conditioners; 100-a compressor; 200-indoor unit; 210-an expansion valve; 220-an inner fan; 230-a temperature sensor; 300-a controller; 400-bus; 500-a memory; 600-expansion valve control means; 610-a determination module; 620-judgment module; 630-execution module.
Detailed Description
Currently, when a plurality of indoor units of a multi-split air conditioner are in operation, when some of the indoor units in the operating indoor units receive a closing demand or reach a warm stop at the same time, electronic expansion valves of the indoor units are closed to a minimum opening degree from a current opening degree at the same time so as to stop capacity output of the indoor units. The electronic expansion valve will again enter regulation until the indoor unit is turned on or has the ability to output the demand. However, when the electronic expansion valves of a plurality of indoor units are simultaneously closed, the parameters of the system can greatly fluctuate. Taking the heating working condition as an example, the expansion valves of a plurality of indoor units are closed, the pressure and the exhaust temperature of the exhaust side of the compressor are quickly increased, and the operation frequency of the compressor is reduced along with the reduction of the total capacity requirement of the indoor units. The exhaust pressure and the exhaust temperature are reduced after being increased, the pipe temperature of the indoor unit is increased and then reduced, and the outlet air temperature of the indoor unit in other running processes is greatly fluctuated, so that the comfort is poor.
Moreover, as the refrigerant piping of the multi-connected air conditioner is long, when the opening degree of the electronic expansion valves is simultaneously reduced, the flow of the refrigerant is rapidly reduced, the refrigerant of the indoor unit cannot return to the compressor in time, so that the low-pressure on the suction side of the compressor is rapidly reduced, even a defrosting condition is triggered, the unit enters a defrosting error program, and then rapidly exits after entering defrosting, and enters normal heating operation. Therefore, fluctuation of the outlet air temperature of the indoor unit is accelerated, and poor heating comfort is caused. In addition, the exhaust temperature rising process may trigger the protection of the exhaust temperature from being too high, and the air conditioner stops running.
Therefore, the control mode of the expansion valve of the multi-connected air conditioner is not reasonable enough, and the operation pressure fluctuation of the air conditioning system is easy to be large when the expansion valves are closed, so that the user experience is not good. Similarly, opening a plurality of expansion valves simultaneously also can bring the fluctuation to air-out temperature, system pressure etc. of indoor unit in service, also can lead to user to use the experience relatively poor. Therefore, it is necessary to optimize the control of the electronic expansion valves when the indoor units of the multi-connected air conditioner, especially when multiple indoor units are simultaneously closed, so as to avoid unstable operation of the air conditioning system caused by simultaneous closing of the opening degrees of the multiple electronic expansion valves, trigger the system to protect shutdown or enter an action of defrosting by mistake, reduce fluctuation of outlet air temperature of the indoor units, and improve comfort of the multi-connected air conditioner.
Therefore, an embodiment of the present application provides an expansion valve control method, which, for a multi-split air conditioner, performs priority ordering on a plurality of indoor units that need to close or open an expansion valve at the same time, and then sequentially controls the expansion valve to perform corresponding closing or opening actions according to the priority ordering. Therefore, the problems that the operation stability of the current multi-connected air conditioner is poor and the user experience is poor can be solved. The embodiment of the application also provides an expansion valve control device and a multi-connected air conditioner, which are used for realizing the control method.
Fig. 1 is a schematic diagram of a partial pipeline of a multi-connected air conditioner 010 according to an embodiment of the present application; fig. 2 is a block diagram illustrating a multi-connected air conditioner 010 according to an embodiment of the present disclosure. As shown in fig. 1 and 2, the multi-type air conditioner 010 includes a plurality of indoor units 200, and the plurality of indoor units 200 are disposed in parallel and form a loop with the compressor 100 for circulation of refrigerant. Each branch line of the indoor unit 200 is provided with an expansion valve 210 of the indoor unit 200, and the opening and closing of the expansion valve 210 is related to the flow rate of the refrigerant in the branch line. When the expansion valve 210 is closed, the corresponding indoor unit 200 is in a shutdown state (including a non-startup state or a warm shutdown); when the expansion valve 210 is opened, the refrigerant flows through the indoor unit 200 by driving the compressor 100, and the indoor environment is cooled or heated, and the indoor unit 200 is in operation. In the present embodiment, the expansion valve 210 is an electronic expansion valve.
In this embodiment, the indoor unit 200 further includes an inner fan 220 and a temperature sensor 230. The inner fan 220 is used for enhancing the heat exchange effect of a coil (not shown in the figure) of the indoor unit 200. In this embodiment, the inner fan 220 has a plurality of windshields, the higher the windshield is, the larger the air quantity is, and the better the heat exchange effect is. The temperature sensor 230 is configured to detect an indoor ambient temperature, which is a current indoor ambient temperature corresponding to the indoor unit 200.
The multi-connected air conditioner 010 further includes a controller 300, and the expansion valve 210, the temperature sensor 230, and the inner fan 220 of each indoor unit 200 are electrically connected to the controller 300. The controller 300 can determine an operation mode, a target temperature, and the like according to an instruction of a user, and can collect an ambient temperature corresponding to the indoor unit 200 according to the temperature sensor 230. The controller 300 may control the expansion valve 210 to perform an opening or closing action according to the collected information and the received instruction.
FIG. 3 is a flowchart illustrating an expansion valve control method according to an embodiment of the present disclosure. As shown in fig. 3, an expansion valve control method provided in an embodiment of the present application includes:
step S100, determining a plurality of target indoor units, wherein the target indoor units are a plurality of indoor units which need to close expansion valves at the same time or a plurality of indoor units which need to open the expansion valves at the same time;
step S200, judging whether the ratio of the total capacity of all target indoor units to the total capacity of all indoor units in operation at present reaches a preset ratio;
if yes, go to step S300: and determining the priority of each target indoor unit, and controlling the expansion valve of each target indoor unit to sequentially execute corresponding closing or opening actions according to the priority of each target indoor unit.
In the embodiment of the present application, if the ratio of the total capacity of the target indoor units 200 that need to close or open the expansion valves 210 at the same time to the total capacity of all the operating indoor units 200 is large, the simultaneous closing or opening of the expansion valves 210 of a plurality of target indoor units 200 easily causes large system pressure fluctuation. Therefore, the expansion valve control method according to the embodiment of the present application includes determining whether a ratio of the total capacity of all target indoor units 200 to the total capacity of all currently operating indoor units 200 reaches a preset ratio, and if the ratio reaches the preset ratio, controlling the expansion valves 210 of the target indoor units 200 to sequentially perform corresponding closing or opening actions according to the priorities of the target indoor units 200. Therefore, the closing or opening actions of the expansion valves 210 of the target indoor units 200 with larger total capacity are performed in sequence rather than simultaneously, so that the excessive pressure fluctuation of the multi-connected air conditioner 010 system in a short time is avoided, and the running stability of the system is improved. The system operation stability is improved, the fluctuation of the air outlet temperature can be reduced, the phenomenon of mistaken defrosting, the phenomenon that the exhaust temperature is too high and the exhaust temperature enters a protection state and the like are not easy to occur, and therefore the use experience of a user is also improved.
As for step S100, optionally, if some indoor units 200 of all the operating indoor units 200 simultaneously receive a shutdown instruction or shutdown at a temperature, these indoor units 200 that simultaneously need to close the expansion valve 210 may be determined as target indoor units 200; however, if all the operating indoor units 200 receive the shutdown instruction or the warm shutdown at the same time, the indoor units 200 may not be determined as the target indoor units 200, that is, the control is not performed in the manner of step S200 or step S300, but the expansion valve 210 is closed at the same time as the existing control manner. Since if all of the operating indoor units 200 need to close the expansion valve 210, no other operating indoor units 200 will be affected, and thus sequential closing is not necessary. Similarly, if the expansion valves 210 of all the indoor units 200 of the multi-type air conditioner 010 need to be opened, it is not necessary to determine all the indoor units 200 as the target indoor units 200. Note that, in the present embodiment, the indoor unit 200 in operation refers to the indoor unit 200 having a refrigerant flowing therethrough, and does not include the indoor unit 200 in only the air blowing state.
In this embodiment, the plurality of indoor units 200 that simultaneously need to close the expansion valve 210 include the indoor unit 200 that has received the shutdown instruction and the indoor unit 200 that has reached the temperature shutdown; the plurality of indoor units 200 that require the expansion valve 210 to be opened at the same time include the indoor unit 200 that has received the power-on instruction and the indoor unit 200 that has exited the temperature-up shutdown. It should be understood that the term "simultaneously closing the expansion valve 210" and "simultaneously opening and closing the expansion valve 210" does not only include the same moment in a strict sense, but also can be a very short time (e.g., within one second) when the controller 300 receives a demand for adjustment of the expansion valve 210. Therefore, the condition that the expansion valve 210 needs to be adjusted includes that the user sends an instruction of stopping or starting the plurality of indoor units 200 at an instant, or the user sends an instruction of stopping or starting the plurality of indoor units 200 in a very short time, or each indoor unit 200 reaches the temperature stop or quits the temperature stop in a very short time.
In step S200, the capacity of each indoor unit 200 is recorded in advance, and the controller 300 can acquire the capacity information of each indoor unit 200 at any time. The controller 300 may calculate the total capacity of the currently operating indoor units 200 and the total capacity of all the target indoor units 200, and calculate the ratio of the total capacity of all the target indoor units 200 to the total capacity of all the currently operating indoor units 200. The higher the ratio, which represents the change in the total capacity of the indoor unit 200 caused by the impending expansion valve 210 adjustment, means that the system will experience greater fluctuations in the simultaneous expansion valve 210 adjustment. It is understood that the ratio of the total capacity of all target indoor units 200 to the total capacity of all currently operating indoor units 200 should be a ratio not greater than 1 if a closing action of the expansion valve 210 is to be performed, and may be greater than 1 if an opening action of the expansion valve 210 is to be performed. In an optional embodiment, the ratio is compared with a preset ratio, and if the ratio is greater than the preset ratio, the expansion valve 210 of the target indoor unit 200 needs to be subsequently adjusted in sequence to relieve system pressure fluctuation; if the ratio is smaller than the preset ratio, it means that it is not necessary to adjust the expansion valves 210 one by one, and the simultaneous opening or closing does not have a great influence. Therefore, optionally, if the ratio of the total capacity of all the target indoor units 200 to the total capacity of all the currently operating indoor units 200 does not reach the preset ratio, the step S400 is executed: and controlling the expansion valves of the target indoor units to simultaneously execute corresponding closing or opening actions. Optionally, the preset ratio is 40% to 60%, for example, 50%.
It should be understood that in one control flow, each target indoor unit 200 of the same batch is an indoor unit 200 that needs to close the expansion valve 210, or each target indoor unit 200 that needs to open the expansion valve 210. That is, two indoor units 200 that require the expansion valve 210 to be closed and the expansion valve 210 to be opened cannot be simultaneously determined as the target indoor unit 200.
With respect to step S300, in an optional embodiment, the step of determining the priority of each target indoor unit 200 includes: and determining the priority of each target indoor unit 200 according to the reference characteristics of each target indoor unit 200, wherein the reference characteristics comprise at least one of a windshield, capacity, temperature difference between the ambient temperature and the target temperature, a communication address and an authority level.
It can be understood that the problem of system operation fluctuation can be alleviated to some extent as long as the priority of each target indoor unit 200 is determined and the expansion valve 210 of the target indoor unit 200 is adjusted in turn (including one of closing and opening). But the effects may still be different if the adjustments are made in different orders. Therefore, the priority of each indoor unit 200 is determined, and reference characteristics that can be referred to include a windshield, a capacity, a temperature difference between an ambient temperature and a target temperature, a communication address, an authority level, and the like. The priorities of the target indoor units 200 can be comprehensively judged by using a plurality of reference characteristics (each reference characteristic can be assigned with different or the same weight), or the priorities of the target indoor units 200 can be judged by only one reference characteristic.
Optionally, when the target indoor units 200 are multiple indoor units 200 that need to open the expansion valve 210 at the same time, determining the priority of each target indoor unit 200 may follow the following rule:
when the reference feature includes a damper, the higher the damper of the target indoor unit 200 is, the lower its priority is;
when the reference feature includes a temperature difference between the ambient temperature and the target temperature, the greater the temperature difference between the ambient temperature and the target temperature corresponding to the target indoor unit 200 is, the lower the priority thereof is;
when the reference feature includes the capacity, the larger the capacity of the target indoor unit 200 is, the higher the priority thereof is.
In the heating process, because the indoor unit 200 with the high windshield can ensure sufficient air volume, the gaseous refrigerant of the indoor unit 200 can be quickly condensed into the liquid refrigerant, the high-pressure quick rise is avoided, the air volume of the indoor unit 200 with the low windshield is small, and if the high-temperature gaseous refrigerant can not effectively dissipate heat, the high-pressure and exhaust temperature of the system can be easily increased. Therefore, the expansion valve 210 of the indoor unit 200 with a high damper is closed later, and the expansion valve 210 of the indoor unit 200 with a low damper is closed first. The difference between the ambient temperature and the target temperature is large, which means that the heating demand in the room is large, whereas the difference is small, which means that the heating load in the room is small. The expansion valve 210 corresponding to the indoor unit 200 with a small temperature difference is closed preferentially, which better meets the user requirements. In addition, the expansion valve 210 corresponding to the indoor unit 200 having a large temperature difference is closed late, so that heat can be dissipated from the heat exchanger in time, and the high pressure of the system is prevented from rising rapidly. The indoor unit 200 having a large capacity has a large influence on other indoor units 200, and therefore, the expansion valve 210 of the target indoor unit 200 having a large capacity should be closed when the total capacity of the indoor units 200 in operation is large, so that the change ratio of the total capacity of the indoor units 200 in operation is relatively small. If the expansion valve 210 of the target indoor unit 200 with a large capacity is closed later, the change of the total capacity of the indoor unit 200 in operation will be large. Therefore, when it is necessary to close the expansion valve 210 of the target indoor unit 200, the priority of closing the indoor unit 200 having a large capacity can reduce the influence of the priority on the system parameters.
Further, in the case where the target indoor units 200 are a plurality of indoor units 200 that simultaneously require opening of the expansion valve 210, the priority of each target indoor unit 200 may be determined according to the following rule:
when the reference feature includes a damper, the higher the damper of the target indoor unit 200 is, the higher its priority is;
when the reference feature includes a temperature difference between the ambient temperature and the target temperature, the greater the temperature difference between the ambient temperature and the target temperature corresponding to the target indoor unit 200 is, the higher the priority thereof is;
when the reference feature includes the capacity, the larger the capacity of the target indoor unit 200 is, the lower the priority thereof is.
Contrary to the case where the target indoor unit 200 is a plurality of indoor units 200 that simultaneously need to close the expansion valve 210, when a plurality of indoor units 200 need to be opened simultaneously, the above-mentioned reference features have opposite influence on the priority, that is, the higher the damper is, the higher the priority is; the larger the temperature difference is, the higher the priority is; the larger the capacity, the lower its priority.
In an alternative embodiment, if the reference characteristics include a plurality of characteristics including a communication address, the step of determining the priority of each target indoor unit 200 may include:
a first priority of each target indoor unit 200 determined according to other characteristics except the communication address; if a plurality of target indoor units 200 with the same first priority exist, a second priority among the plurality of target indoor units 200 with the same first priority is further determined according to the communication addresses.
When the priority of the target indoor unit 200 cannot be distinguished through the windshield, the temperature difference between the target temperature and the ambient temperature, and the capacity, the priority may be determined according to the communication address, for example, the priority may be automatically sorted according to the communication address sequence of the target indoor unit 200. If the first priority of each target indoor unit 200 is different, the expansion valves 210 of the respective indoor units 200 are sequentially adjusted with the first priority as the final priority.
In addition, if the reference feature includes an authority level, for example, a VIP indoor unit is set in the multi-connected air conditioner 010, the VIP indoor unit is preferentially adjusted (with the highest priority), and after the adjustment, the priorities of the other target indoor units 200 are compared.
In an alternative embodiment, the priority evaluation may be performed by using one reference feature in sequence each time according to the different weights of the reference features and the weights from high to low, and if two (or more) target indoor units 200 with the same priority appear, the priority order of the two (or more) target indoor units 200 may be evaluated by using the next reference feature. For example, the priorities of the target indoor units 200 may be first sorted by using the windshield; if the two (or more) target indoor units 200 have the same windshield, continuously comparing the temperature difference between the environment temperature and the target temperature corresponding to the two (or more) target indoor units 200; if the target indoor units 200 with the same temperature difference still exist, the priorities are distinguished according to the capacity; if the communication address can not be distinguished, the communication address is automatically sorted finally.
In an alternative embodiment, the time interval for controlling the expansion valves 210 of the target indoor units 200 to sequentially perform the corresponding closing or opening operations is 1s to 10s, for example, 3 s. Setting a certain time interval can mitigate system pressure fluctuations caused by the opening and closing of the expansion valve 210.
The expansion valve control method has the following advantages that:
1. when the expansion valves 210 of the indoor units 200 need to be closed at the same time (under a heating working condition), the exhaust pressure and the exhaust temperature fluctuation in the system can be reduced, and the triggering protection shutdown and the like are prevented;
2. when the expansion valves 210 of the indoor units 200 need to be closed at the same time (under a heating working condition), the low pressure and the outdoor unit defrosting temperature can be prevented from being rapidly reduced, so that the air conditioner enters into wrong defrosting control;
3. when the expansion valves 210 of the plurality of indoor units 200 need to be opened at the same time, the sudden drop of the high pressure of the system can be avoided, and the operation stability is increased;
4. when the electronic expansion valves 210 of the plurality of indoor units 200 are simultaneously closed or opened, the influence on the air outlet temperature of the operating indoor units 200 is reduced, and the heating comfort is improved.
Fig. 4 is a schematic diagram of an expansion valve control apparatus 600 according to an embodiment of the present disclosure. As shown in fig. 4, expansion valve control apparatus 600 includes:
the determining module 610 is configured to determine a plurality of target indoor units, where the plurality of target indoor units are a plurality of indoor units that need to close an expansion valve at the same time or a plurality of indoor units that need to open the expansion valve at the same time;
the judging module 620 is configured to judge whether a ratio of the total capacity of all the target indoor units to the total capacity of all currently operating indoor units reaches a preset ratio;
and an executing module 630, configured to determine the priority of each target indoor unit when it is determined that the ratio of the total capacity of all the target indoor units to the total capacity of all currently operating indoor units reaches a preset ratio, and control the expansion valves of each target indoor unit to sequentially execute corresponding closing or opening actions according to the priority of each target indoor unit.
The expansion valve control device 600 and each module included in the expansion valve control device may be an executable program, and the controller 300 may be invoked to implement the expansion valve control method provided by the embodiment of the present application. It should be understood that the expansion valve control apparatus 600 may contain more modules, and each module may have more functions. The description of the expansion valve control method in the present application can be referred to for the function implementation manner corresponding to each module, and will not be described herein again.
Fig. 5 is a block diagram of a multi-connected air conditioner 010 according to an embodiment of the present disclosure. As shown in fig. 5, the multi-connected air conditioner 010 further includes a memory 500 and a bus 400, and the controller 300 is connected to the memory 500 through the bus 400.
The controller 300 may be an integrated circuit chip having signal processing capabilities. The controller 300 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 500 is used to store a program, such as the expansion valve control device 600 shown in fig. 4. The expansion valve control device 600 includes at least one software function module, which may be stored in the memory 500 in the form of software or firmware (firmware) or solidified in the operating system of the multi-connected air conditioner 010, and the controller 300 executes the above program after receiving the execution instruction to implement the expansion valve control method disclosed in the above embodiment. The Memory 500 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 500 may be integrated with the controller 300, for example, the memory 500 may be integrated with the controller 300 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 (11)
1. An expansion valve control method is applied to a multi-connected air conditioner and is characterized by comprising the following steps:
determining a plurality of target indoor units, wherein the target indoor units are a plurality of indoor units which need to close the expansion valve at the same time or a plurality of indoor units which need to open the expansion valve at the same time;
judging whether the ratio of the total capacity of all the target indoor units to the total capacity of all the indoor units in operation at present reaches a preset ratio or not;
if yes, determining the priority of each target indoor unit, and controlling the expansion valve of each target indoor unit to sequentially execute corresponding closing or opening actions according to the priority of each target indoor unit.
2. The expansion valve control method according to claim 1, wherein the step of determining the priority of each of the target indoor units comprises:
and determining the priority of each target indoor unit according to the reference characteristics of each target indoor unit, wherein the reference characteristics comprise at least one of a windshield, capacity, temperature difference between the ambient temperature and the target temperature, a communication address and an authority level.
3. The expansion valve control method according to claim 2, wherein, when the target indoor units are a plurality of indoor units that simultaneously require the expansion valve to be closed:
when the reference feature comprises a windshield, the higher the windshield of the target indoor unit is, the lower the priority of the target indoor unit is;
when the reference characteristic comprises a temperature difference between the environment temperature and the target temperature, the larger the temperature difference between the environment temperature and the target temperature corresponding to the target indoor unit is, the lower the priority is;
when the reference feature contains capacity, the larger the capacity of the target indoor unit is, the higher the priority thereof is.
4. The expansion valve control method according to claim 2, wherein, when the target indoor unit is a plurality of indoor units that simultaneously require opening of the expansion valve:
when the reference feature comprises a windshield, the higher the windshield of the target indoor unit is, the higher the priority of the target indoor unit is;
when the reference characteristic comprises a temperature difference between the environment temperature and the target temperature, the larger the temperature difference between the environment temperature and the target temperature corresponding to the target indoor unit is, the higher the priority is;
when the reference feature contains capacity, the higher the capacity of the target indoor unit is, the lower the priority of the target indoor unit is.
5. The expansion valve control method according to claim 2, wherein the reference characteristic includes a plurality of characteristics including the communication address, and the step of determining the priority of each of the target indoor units includes:
determining a first priority of each target indoor unit according to other characteristics except the communication address;
and if a plurality of target indoor units with the same first priority exist, determining a second priority among the plurality of target indoor units with the same first priority according to the communication address.
6. An expansion valve control method according to any one of claims 1-5, wherein the time interval for controlling the expansion valve of each target indoor unit to perform the corresponding closing or opening actions in sequence is 1 s-10 s.
7. An expansion valve control method according to any of claims 1-5, wherein the predetermined proportion is in the range of 40% to 60%.
8. The expansion valve control method according to any one of claims 1 to 5, wherein the plurality of indoor units requiring closing of the expansion valve at the same time include an indoor unit that has received a shutdown instruction and an indoor unit that has been shutdown to reach a temperature; the indoor units which need to open the expansion valve at the same time comprise the indoor unit which receives the starting instruction and the indoor unit which quits the temperature reaching shutdown.
9. The expansion valve control method of any of claims 1-5, wherein if the ratio of the total capacity of all the target indoor units to the total capacity of all currently operating indoor units does not reach the preset ratio, the expansion valves of the target indoor units are controlled to simultaneously perform corresponding closing or opening actions.
10. An expansion valve control device applied to a multi-connected air conditioner, characterized by comprising:
the system comprises a determining module, a judging module and a judging module, wherein the determining module is used for determining a plurality of target indoor units, and the target indoor units are a plurality of indoor units which need to close expansion valves at the same time or a plurality of indoor units which need to open the expansion valves at the same time;
the judging module is used for judging whether the ratio of the total capacity of all the target indoor units to the total capacity of all the indoor units in operation at present reaches a preset ratio or not;
and the execution module is used for determining the priority of each target indoor unit under the condition that the ratio of the total capacity of all the target indoor units to the total capacity of all the indoor units in current operation reaches the preset ratio, and controlling the expansion valves of all the target indoor units to sequentially execute corresponding closing or opening actions according to the priority of each target indoor unit.
11. A multi-connected air conditioner comprising a controller for executing an executable program to implement the expansion valve control method of any one of claims 1-9.
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| CN202110745475.3A CN113405155A (en) | 2021-07-01 | 2021-07-01 | Expansion valve control method and device and multi-connected air conditioner |
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| CN202110745475.3A CN113405155A (en) | 2021-07-01 | 2021-07-01 | Expansion valve control method and device and multi-connected air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113944979A (en) * | 2021-11-12 | 2022-01-18 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device, multi-connected air conditioner and computer storage medium |
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