CN113188230B - Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner - Google Patents
Expansion valve control method and device of multi-connected air conditioner and multi-connected air conditioner Download PDFInfo
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- CN113188230B CN113188230B CN202110410915.XA CN202110410915A CN113188230B CN 113188230 B CN113188230 B CN 113188230B CN 202110410915 A CN202110410915 A CN 202110410915A CN 113188230 B CN113188230 B CN 113188230B
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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
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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
- F24F11/62—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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention discloses a method and a device for controlling an expansion valve of a multi-connected air conditioner and the multi-connected air conditioner, and relates to the technical field of air conditioners, wherein the method for controlling the expansion valve of the multi-connected air conditioner comprises the following steps: detecting whether the multi-connected air conditioner is in a heating mode or not; when the multi-connected air conditioner is in a heating mode, periodically detecting the opening of an expansion valve of an outdoor unit of the multi-connected air conditioner; and when the opening of the expansion valve of the outdoor unit is greater than a first preset opening or smaller than a second preset opening, controlling the opening of the expansion valve of the indoor unit of the multi-connected air conditioner. The invention can adopt a mode of linkage control of the outdoor unit expansion valve when the opening of the outdoor unit expansion valve is larger or smaller so as to ensure that the opening of the outdoor unit expansion valve is in a proper range, thereby ensuring that the return air superheat degree of the multi-connected air conditioner is in a controllable range and improving the operation reliability of the multi-connected air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling an expansion valve of a multi-connected air conditioner and the multi-connected air conditioner.
Background
At present, indoor unit expansion valves and outdoor expansion valves of a multi-split air conditioner are generally controlled independently according to fixed target values, in a multi-split air conditioner heating mode, return air superheat degree of a compressor is generally controlled by controlling an outdoor unit expansion valve, and supercooling degree of an outlet of an indoor heat exchanger is controlled by an indoor expansion valve.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for controlling an expansion valve of a multi-connected air conditioner and the multi-connected air conditioner, which can improve the operation reliability of the multi-connected air conditioner.
According to an embodiment of the present invention, in one aspect, there is provided a method for controlling an expansion valve of a multi-connected air conditioner, including: detecting whether the multi-connected air conditioner is in a heating mode or not; when the multi-connected air conditioner is in a heating mode, periodically detecting the opening of an expansion valve of an outdoor unit of the multi-connected air conditioner; and when the opening of the expansion valve of the outdoor unit is larger than a first preset opening or smaller than a second preset opening, controlling the opening of the expansion valve of the indoor unit of the multi-connected air conditioner.
By adopting the technical scheme, when the opening degree of the outdoor unit expansion valve is larger or smaller, the mode of linkage control of the outdoor unit expansion valve is adopted, so that the opening degree of the outdoor unit expansion valve is in a proper range, the return air superheat degree of the multi-connected air conditioner is in a controllable range, and the running reliability of the multi-connected air conditioner is improved.
Preferably, the step of controlling the opening of the expansion valve of the indoor unit of the multi-connected air conditioner when the opening of the expansion valve of the outdoor unit is greater than a first preset opening or smaller than a second preset opening includes: and when the opening degree of the expansion valve of the outdoor unit is greater than the first preset opening degree, acquiring a target supercooling degree of the indoor unit of the multi-connected air conditioner, and controlling the target supercooling degree to reduce a first preset temperature so as to increase the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner.
By adopting the technical scheme, when the opening of the outdoor unit expansion valve is large, the target supercooling degree of the multi-connected air conditioner is controlled to be reduced, the opening of the indoor unit expansion valve can be increased, the opening of the outdoor unit expansion valve can be reduced, the problem that the compressor of the multi-connected air conditioner is poor in stability due to the fact that the opening of the outdoor unit expansion valve is too large is solved, and the heating operation stability of the multi-connected air conditioner is improved.
Preferably, the expansion valve control method of the multi-connected air conditioner further includes: when the opening degree of the expansion valve of the outdoor unit is reduced to be smaller than a third preset opening degree, or when the compressor of the multi-connected air conditioner stops running, the current target supercooling degree of the indoor unit of the multi-connected air conditioner is obtained, and the current target supercooling degree is controlled to be restored to the preset target supercooling degree.
By adopting the technical scheme, when the opening degree of the outdoor unit expansion valve is reduced or the compressor stops running, the target supercooling degree of the indoor unit is controlled to recover the default value, so that the multi-connected air conditioner can recover the normal control of the expansion valve, the heating comfort level of the multi-connected air conditioner is ensured, and the use experience of a user is improved.
Preferably, the step of controlling the opening of the expansion valve of the indoor unit of the multi-connected air conditioner when the opening of the expansion valve of the outdoor unit is greater than a first preset opening or smaller than a second preset opening includes: and when the opening degree of the outdoor unit expansion valve is smaller than the second preset opening degree, or when the opening degree of the outdoor unit expansion valve is equal to the preset minimum opening degree, acquiring a target supercooling degree of the indoor unit of the multi-connected air conditioner, and controlling the target supercooling degree to increase the second preset temperature so as to reduce the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner.
By adopting the technical scheme, when the opening degree of the outdoor unit expansion valve is smaller, the target supercooling degree of the multi-connected air conditioner is controlled to be increased, the opening degree of the indoor unit expansion valve can be reduced, the opening degree of the outdoor unit expansion valve can be further increased, the return air superheat degree is ensured to be in a controllable range, the problem that the compressor of the multi-connected air conditioner is poor in stability due to the fact that the opening degree of the outdoor unit expansion valve is too small is solved, and the heating operation reliability of the multi-connected air conditioner is improved.
Preferably, the method for controlling the expansion valve of the multi-connected air conditioner further includes: when the opening degree of the expansion valve of the outdoor unit is increased to be larger than or equal to a fourth preset opening degree, or when the compressor of the multi-connected air conditioner stops operating, the current target supercooling degree of the indoor unit of the multi-connected air conditioner is obtained, and the current target supercooling degree is controlled to be restored to the preset target supercooling degree.
By adopting the technical scheme, when the opening degree of the outdoor unit expansion valve is larger than the minimum opening degree or the compressor stops running, the target supercooling degree of the indoor unit is controlled to recover the default value, so that the multi-connected air conditioner timely exits from the step of controlling the target supercooling degree due to the undersize opening degree of the outdoor unit expansion valve, and the reliability of the control of the multi-connected air conditioner is improved.
Preferably, the step of periodically detecting the opening of the expansion valve of the outdoor unit of the multi-connected air conditioner when the multi-connected air conditioner is in the heating mode includes: and when the running time of the multi-connected air conditioner in the heating mode reaches a first preset time, detecting the opening of an expansion valve of an outdoor unit of the multi-connected air conditioner at intervals of a second preset time. Because the compressor is in the rapid frequency increasing stage in the starting stage of the heating mode of the multi-connected air conditioner, various system parameters in the multi-connected air conditioner system are unstable, the expansion valve of the indoor unit and the expansion valve of the outdoor unit are in the rapid adjusting stage, and the opening of the expansion valve of the outdoor unit is periodically detected after the multi-connected air conditioner is started and operated for the first preset time, the detected opening of the expansion valve of the outdoor unit can be prevented from having larger errors, and the probability of mis-adjusting the expansion valve is reduced.
By adopting the technical scheme, after the multi-connected air conditioner is started to operate for the first preset time, the opening of the expansion valve of the outdoor unit is periodically detected, so that the detected opening of the expansion valve of the outdoor unit can be prevented from having larger errors, and the probability of misadjustment of the expansion valve is reduced.
Preferably, the value range of the second preset time is 3-20 min.
By adopting the technical scheme, the detection period of the outdoor unit expansion valve is set to be any time between 3-20 min, the opening degree of the indoor expansion valve and the opening degree of the outdoor expansion valve can be given certain adjusting time after the target supercooling degree is adjusted every time, the accurate control action is ensured, the opening degree of the outdoor expansion valve detected in the next period is more accurate, and the reliability of expansion valve control is improved.
According to an embodiment of the present invention, in another aspect, there is provided an expansion valve control apparatus for a multi-connected air conditioner, including: the first detection module is used for detecting whether the multi-connected air conditioner is in a heating operation mode or not; the second detection module is used for periodically detecting the opening of an expansion valve of an outdoor unit of the multi-connected air conditioner when the multi-connected air conditioner is in a heating mode; and the control module is used for controlling the opening of the expansion valve of the indoor unit of the multi-connected air conditioner when the opening of the expansion valve of the outdoor unit is larger than a first preset opening or smaller than a second preset opening.
According to an embodiment of the present invention, another aspect provides a multi-connected air conditioner, which includes a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed by the processor to implement the method according to any one of the first aspect.
According to an embodiment of the present invention, another aspect provides a computer-readable storage medium, in which a computer program is stored, and the computer program is read and executed by a processor to implement the method according to any one of the first aspect.
The invention has the following beneficial effects: when the multi-connected air conditioner is operated in a heating mode, the opening degree of an expansion valve of an outdoor unit of the multi-connected air conditioner is periodically detected, and when the opening degree of the expansion valve of the outdoor unit is larger or smaller, the opening degree of the expansion valve of the outdoor unit is controlled in a linkage mode, so that the opening degree of the expansion valve of the outdoor unit is in a proper range, the return air superheat degree of the multi-connected air conditioner is in a controllable range, and the operation reliability of the multi-connected air conditioner is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flowchart illustrating an expansion valve control method of a multi-connected air conditioner according to the present invention;
fig. 2 is a schematic structural view of a multi-split air conditioner according to the present invention;
fig. 3 is a schematic structural diagram of an expansion valve control device of a multi-connected air conditioner according to the present invention.
Description of reference numerals:
21-outdoor heat exchanger; 22-a compressor; 23-outdoor unit expansion valve; 241-24 n-outdoor heat exchanger; 251-25 n-indoor unit expansion valve.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The first embodiment is as follows:
the embodiment provides an expansion valve control method of a multi-connected air conditioner, which may be applied to a controller of the multi-connected air conditioner, referring to a flowchart of the expansion valve control method of the multi-connected air conditioner shown in fig. 1, and the method mainly includes the following steps S102 to S106:
step S102: and detecting whether the multi-connected air conditioner is in a heating mode.
And when the operation mode received from the user is the heating mode, determining that the multi-connected air conditioner is in the heating mode to operate.
Step S104: when the multi-connected air conditioner is in a heating mode, the opening degree of an outdoor unit expansion valve of the multi-connected air conditioner is periodically detected.
Referring to the schematic diagram of the multi-split air conditioner shown in fig. 2, the multi-split air conditioner includes an outdoor heat exchanger 21, a compressor 22, an outdoor expansion valve 23, a plurality of outdoor heat exchangers 241 to 24n, and a plurality of indoor expansion valves 251 to 25n, the opening degrees of the outdoor expansion valve 23 and the plurality of indoor expansion valves 251 to 25n may be electronic expansion valves that are independently controlled, and the outdoor expansion valve 23 and the plurality of indoor expansion valves 251 to 25n are respectively connected to a controller of the multi-split air conditioner in a communication manner. When the multi-connected air conditioner is in a heating mode, the opening degree of an outdoor unit expansion valve fed back by the outdoor unit expansion valve is periodically acquired.
Step S106: and when the opening of the expansion valve of the outdoor unit is greater than the first preset opening or smaller than the second preset opening, controlling the opening of the expansion valve of the indoor unit of the multi-connected air conditioner.
In the heating operation process of the multi-connected air conditioner, the expansion valve of the outdoor unit is easily opened to the maximum opening or the minimum opening, and the problem that the multi-connected air conditioner is unstable due to uncontrollable return air superheat degree is solved:
the outdoor expansion valve usually controls the superheat degree of the return air of the compressor, the indoor expansion valve controls the supercooling degree of the outlet of the indoor heat exchanger, the superheat degree of the return air is less influenced by the ambient temperature, the supercooling degree of the indoor unit is high-pressure temperature-the temperature of the middle part of the indoor heat exchanger, the temperature change range of the middle part of the heat exchanger is large, the influence of the external environment is large, when the ambient temperature rises, the expansion valve of the indoor unit preferentially acts, the high-pressure saturation temperature rises, the supercooling degree of the indoor unit increases, the expansion valve of the indoor unit is firstly opened, the flow of the refrigerant entering the indoor unit rises, further, the outdoor evaporator can not be evaporated completely, the opening of the expansion valve of the outdoor unit needs to be reduced to control the flow rate, when the expansion valve of the outdoor unit is closed to the minimum, the refrigerant in the outdoor evaporator can not be completely evaporated, so that the superheat degree of return air can not be controlled, liquid refrigerant enters the compressor, and the risk of liquid compression of the compressor is high.
On the contrary, when the ambient temperature is reduced, the expansion valve of the indoor unit is preferably closed, the refrigerant circulation flow of the multi-air-conditioning system is small, the opening degree of the expansion valve of the outdoor unit is increased and the refrigerant flow is increased easily due to the large suction superheat degree of the outdoor heat exchanger, and when the opening degree of the expansion valve of the outdoor unit is opened to the maximum, the return superheat degree cannot be reduced, the exhaust temperature of the compressor is increased, and the compression efficiency is reduced.
In order to avoid the influence on the running reliability of the compressor caused by the fact that the outdoor expansion valve cannot control the superheat degree of return air, after the opening degree of the outdoor expansion valve is detected every time, whether the outdoor expansion valve is larger than a first preset opening degree or smaller than a second preset opening degree is judged, if yes, linkage control is carried out on the indoor expansion valve, and therefore the outdoor expansion valve is smaller than the first preset opening degree or larger than the second preset opening degree. The first preset opening degree and the second preset opening degree may be determined according to an opening degree range of an outdoor unit expansion valve, for example, a value range of the first preset opening degree may be 450 to 480pls, and a preferred value is 470 pls; the value of the second preset opening degree can range from 60 pls to 150pls, and the preferred value is 100 pls.
According to the expansion valve control method of the multi-connected air conditioner, when the multi-connected air conditioner operates in the heating mode, the opening degree of the expansion valve of the outdoor unit of the multi-connected air conditioner is periodically detected, and when the opening degree of the expansion valve of the outdoor unit is larger or smaller, the mode of controlling the expansion valve of the outdoor unit in a linkage mode is adopted, so that the opening degree of the expansion valve of the outdoor unit is in a proper range, the return air superheat degree of the multi-connected air conditioner is in a controllable range, and the operation reliability of the multi-connected air conditioner is improved.
In order to control the opening degree of the expansion valve of the outdoor unit to decrease when the opening degree of the expansion valve of the outdoor unit of the multi-connected air conditioner is large, the present embodiment provides an implementation manner for controlling the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner, and the implementation manner may be specifically executed with reference to the following steps (1) to (2):
step (1): when the opening degree of the expansion valve of the outdoor unit is larger than the first preset opening degree, the target supercooling degree of the indoor unit of the multi-connected air conditioner is obtained, and the target supercooling degree is controlled to reduce the first preset temperature, so that the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner is increased.
When the opening degree of the outdoor unit expansion valve is detected to be large each time, in order to avoid the opening degree of the outdoor unit expansion valve from being continuously increased to the maximum opening degree, the current target supercooling degree of the outdoor unit of the multi-connected air conditioner is obtained, and the current target supercooling degree of the multi-connected air conditioner is controlled to reduce the first preset temperature. The opening of the expansion valve of the indoor unit can be increased, the flow of the refrigerant is increased, and the expansion valve of the outdoor unit does not need to be fully opened, so that the purpose of reducing the opening of the expansion valve of the outdoor unit is achieved.
When the supercooling degree of the indoor unit is controlled, the actual supercooling degree (high-pressure saturation temperature-temperature in the pipe) is close to the target supercooling degree by adjusting the expansion valve of the indoor unit, when the opening degree of the expansion valve of the indoor unit is controlled to be increased, the flow of a refrigerant flowing through the indoor heat exchanger is increased, the evaporator cannot cool the refrigerant to the temperature before the opening degree is increased, the temperature in the pipe is increased, and the actual supercooling degree is reduced. When the opening of the expansion valve of the indoor unit is increased, the flow rate of the refrigerant in the pipeline can be increased, and the opening of the expansion valve of the outdoor unit can be reduced.
The multi-connected air conditioner periodically detects the opening degree of the expansion valve of the outdoor unit, namely when the opening degree of the expansion valve of the outdoor unit is overlarge, the target supercooling degree is periodically controlled to be reduced, and in order to avoid that the target supercooling degree single reduction value is too small to cause the expansion valve of the indoor unit to be not operated for a long time or the target supercooling degree single reduction value is overlarge to cause the adjustment fluctuation of the expansion valve of the indoor unit to be large, the first preset temperature can be 1 ℃, so that when the target supercooling degree is changed, the expansion valve of the indoor unit can rapidly respond to adjustment, and the adjustment amplitude is not overlarge.
When the opening of the outdoor unit expansion valve is large, the target supercooling degree of the multi-connected air conditioner is controlled to be reduced, the opening of the indoor unit expansion valve can be increased, the opening of the outdoor unit expansion valve can be reduced, the problem that the compressor of the multi-connected air conditioner is poor in stability due to the fact that the opening of the outdoor unit expansion valve is too large is solved, and the heating operation stability of the multi-connected air conditioner is improved.
Step (2): when the opening degree of the expansion valve of the outdoor unit is reduced to be smaller than a third preset opening degree or when the compressor of the multi-connected air conditioner stops operating, the current target supercooling degree of the indoor unit of the multi-connected air conditioner is obtained, and the current target supercooling degree is controlled to be restored to the preset target supercooling degree.
The opening degree of the expansion valve of the indoor unit is gradually increased by periodically controlling the target supercooling degree to be reduced, the opening degree of the expansion valve of the outdoor unit can be effectively reduced, when the opening degree of the expansion valve of the outdoor unit of the multi-connected air conditioner is smaller than a third preset opening degree, or when a compressor of the multi-connected air conditioner stops running, the multi-connected air conditioner is controlled to quit the step of controlling the target supercooling degree, the target supercooling degree of the indoor unit is controlled to be restored to the preset target supercooling degree, and the preset target supercooling degree can be a target supercooling degree default value of the indoor unit. The third preset opening is within an optimum range of the opening of the expansion valve of the outdoor unit (at this time, the degree of superheat of the return air is within a controllable range), for example, a value of the third preset opening may be 350 to 450pls, and a preferred value is 400 pls.
When the opening of the expansion valve of the outdoor unit is reduced or the compressor stops running, the target supercooling degree of the indoor unit is controlled to recover the default value, so that the multi-connected air conditioner can recover normal control over the expansion valve, the heating comfort level of the multi-connected air conditioner is guaranteed, and the use experience of a user is improved.
In order to control the opening degree of the expansion valve of the outdoor unit of the multi-connected air conditioner to increase when the opening degree of the expansion valve of the outdoor unit is smaller, the present embodiment provides another embodiment for controlling the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner, and the following steps 1) to 2) may be specifically referred to:
Step 1): and when the opening degree of the outdoor unit expansion valve is smaller than a second preset opening degree, or when the opening degree of the outdoor unit expansion valve is equal to a preset minimum opening degree, acquiring a target supercooling degree of the indoor unit of the multi-connected air conditioner, and controlling the target supercooling degree to increase a second preset temperature so as to reduce the opening degree of the indoor unit expansion valve of the multi-connected air conditioner.
When the opening degree of the expansion valve of the outdoor unit is detected to be small, in order to avoid the influence on the running stability of the compressor when the opening degree of the expansion valve of the outdoor unit is at the minimum opening degree, the current target supercooling degree of the outdoor unit of the multi-connected air conditioner is obtained, and the current target supercooling degree of the multi-connected air conditioner is controlled to be increased by a second preset temperature. When the opening degree of the outdoor unit expansion valve is smaller, the situation that more refrigerants enter the outdoor heat exchanger in the multi-connected air-conditioning system and the flow rate of the refrigerants needs to be reduced is shown, the opening degree of the indoor unit expansion valve can be reduced by controlling the target supercooling degree of the indoor unit of the multi-connected air-conditioner to increase the second preset temperature, the flow rate of the refrigerants is reduced, and the opening degree of the outdoor unit expansion valve is increased.
The second preset temperature may be the same as or different from the first preset temperature, and the second preset temperature may be 1 degree in order to avoid that the expansion valve of the indoor unit does not operate for a long time due to too small single-time increment of the target supercooling degree, or that the adjustment fluctuation of the expansion valve of the indoor unit is large due to too large single-time increment of the target supercooling degree.
When the target supercooling degree of the multi-connected air conditioner indoor unit is increased, the stable state can be achieved only by controlling the actual supercooling degree of the indoor unit to be increased, the control of the supercooling degree to be increased is realized by controlling the opening degree of the expansion valve of the indoor unit to be reduced, and when the opening degree of the expansion valve of the indoor unit is reduced, the flow of a refrigerant in a pipeline can be reduced, so that the opening degree of the expansion valve of the outdoor unit can be increased.
When the opening degree of the outdoor unit expansion valve is small, the target supercooling degree of the multi-connected air conditioner is controlled to be increased, so that the opening degree of the indoor unit expansion valve can be reduced, the opening degree of the outdoor unit expansion valve can be increased, the return air superheat degree is guaranteed to be within a controllable range, the problem that the stability of a compressor of the multi-connected air conditioner is poor due to the fact that the opening degree of the outdoor unit expansion valve is too small is solved, and the reliability of heating operation of the multi-connected air conditioner is improved.
Step 2): when the opening degree of the expansion valve of the outdoor unit is increased to be larger than or equal to a fourth preset opening degree, or when the compressor of the multi-connected air conditioner stops running, the current target supercooling degree of the indoor unit of the multi-connected air conditioner is obtained, and the current target supercooling degree is controlled to be restored to the preset target supercooling degree.
After the target supercooling degree of the indoor unit is periodically increased, the opening degree of an expansion valve of the outdoor unit is gradually increased, when the multi-split air conditioner meets the condition that the opening degree of the expansion valve of the outdoor unit is increased to be more than or equal to a fourth preset opening degree, or when a compressor of the multi-split air conditioner stops running, the multi-split air conditioner is controlled to exit a step of controlling the target supercooling degree, the target supercooling degree of the indoor unit is controlled to be restored to the preset target supercooling degree, and the preset target supercooling degree can be a target supercooling degree default value of the indoor unit. The fourth preset opening degree may be determined according to a minimum opening degree of the outdoor unit expansion valve, for example, the fourth preset opening degree may range from the minimum opening degree to a minimum opening degree +50pls, and a preferred value is the minimum opening degree +20 pls.
In practical application, the adjustable range of the target supercooling degree is 4-10 ℃, namely after the target supercooling degree of the indoor unit is periodically reduced or increased for 4-10 times, in order to avoid the influence of the increase or reduction of the target supercooling degree on the running stability of the multi-connected air conditioner, the multi-connected air conditioner can be controlled to quit the step of adjusting the target supercooling degree.
When the opening of the outdoor unit expansion valve is larger than the minimum opening or the compressor stops running, the target supercooling degree of the indoor unit is controlled to recover the default value, so that the multi-connected air conditioner timely exits the step of controlling the target supercooling degree due to the fact that the opening of the outdoor unit expansion valve is too small, and the reliability of control over the multi-connected air conditioner is improved.
In a specific embodiment, the step of periodically detecting the opening degree of the expansion valve of the outdoor unit of the multi-connected air conditioner when the multi-connected air conditioner is in the heating mode includes: when the running time of the multi-connected air conditioner in the heating mode reaches a first preset time, detecting the opening of an outdoor unit expansion valve of the multi-connected air conditioner at intervals of a second preset time. The first preset time is an operation time for the multi-connected air conditioner to reach stable heating from the start-up, and may be 5min, for example. When the opening degree of an outdoor unit expansion valve of the multi-connected air conditioner is detected at every second preset time, the target supercooling degree of the indoor unit needs to be controlled according to the opening degree of the outdoor unit expansion valve.
Because the compressor is in the rapid frequency increasing stage in the starting stage of the heating mode of the multi-connected air conditioner, various system parameters in the multi-connected air conditioner system are unstable, the expansion valve of the indoor unit and the expansion valve of the outdoor unit are in the rapid adjusting stage, and the opening of the expansion valve of the outdoor unit is periodically detected after the multi-connected air conditioner is started and operated for the first preset time, the detected opening of the expansion valve of the outdoor unit can be prevented from having larger errors, and the probability of mis-adjusting the expansion valve is reduced.
In a specific embodiment, the second predetermined time is 3 to 20 min. By setting the detection period of the outdoor unit expansion valve to any time between 3 and 20min, certain adjustment time can be given to the opening degree of the indoor expansion valve and the opening degree of the outdoor expansion valve after the target supercooling degree is adjusted every time, so that the accuracy of control action is ensured, the opening degree of the outdoor expansion valve detected in the next period is more accurate, and the reliability of expansion valve control is improved.
According to the method for controlling the expansion valve of the multi-connected air conditioner, when the outdoor unit expansion valve is too large or too small, the opening degree of the indoor unit expansion valve can be adjusted by controlling the target supercooling degree of the indoor unit, so that the outdoor unit expansion valve can be adjusted in a linkage manner, the control target is set to be the target supercooling degree, the method can be suitable for the multi-connected air conditioners of different expansion valve types, and the universality of the method for controlling the expansion valve of the multi-connected air conditioner is improved.
The second embodiment:
corresponding to the method for controlling the expansion valve of the multi-connected air conditioner provided in the first embodiment, an example of the method for controlling the expansion valve of the multi-connected air conditioner provided in the embodiment of the present invention is provided, and the method may be specifically executed in reference to the following first mode and second mode:
the method I comprises the following steps: the method comprises the following steps of controlling the opening of an expansion valve of the outdoor unit to be overlarge in the heating process:
the method comprises the steps that the size of the opening degree of an expansion valve of an outdoor unit is judged after the multi-connected air conditioner is started, oil return and load are switched for 5min, the judgment is carried out once at an interval t, system parameters are unstable when a compressor is in a quick frequency rising stage in a starting stage, a defrosting and oil return four-way valve is reversed, system parameter transformation is large, the opening degree of the expansion valve of the outdoor unit is in a quick adjusting stage, and at the moment, if other controls are involved, the probability of misadjustment is large.
In order to prevent frequent adjustment of the control target of the expansion valve of the indoor unit, the target value of the control valve cannot be obtained a plurality of times within tmin of the change of the control target (overshoot is easy). And increasing time conditions, wherein control parameters of the expansion valve are temperature parameters, the expansion valve needs a certain time when the temperature changes, and in order to ensure the accuracy of control action, the value range of t is 3-20 min, preferably 5 min.
And when the indoor unit of the multi-connected air conditioner enters a heating mode and the opening degree of an expansion valve of the outdoor unit is greater than c, the multi-connected air conditioner enters a control action. c is preferably 470pls, and the protection range is 450-480 pls.
The control actions include: and (3) controlling the target supercooling degree of the indoor unit to be reduced by 1 degree, wherein the adjusting range cannot exceed the adjusting range in the parameter description (such as the adjustable range of the target supercooling degree of the indoor unit is 4-10 ℃). The opening degree of the expansion valve of the outdoor unit is maximum, which means that the multi-connected air-conditioning system needs more refrigerants, and at the moment, if the supercooling degree target value is reduced, the valve of the indoor unit is opened greatly, the flow of the refrigerants is increased, and the valve of the outdoor unit does not need to be opened fully. The explanation about the reduction of the target supercooling degree by 1 ℃ is that the program can recognize once in 5min, if the value of the single change of the target supercooling degree is selected to be too small, the valve has no action for a long time, and the supercooling degree and the valve regulation fluctuation are caused by overlarge value, aiming at the actual supercooling degree of the internal machine, the temperature measurement accuracy of the thermocouple is ensured to be accurate at 1 ℃, and the change valve of the target supercooling degree responds quickly.
And (3) controlling the exit condition by the overlarge opening of an expansion valve of the outdoor unit: and when the expansion valve is under the condition of controlling the opening degree of the expansion valve of the heating outdoor unit to be overlarge and meets any one of the following conditions (I), the expansion valve is withdrawn from the heating outdoor unit to be controlled to be overlarge.
When the multi-connected indoor unit enters a heating mode and the opening degree of an expansion valve of the outdoor unit is smaller than d. d is preferably 400pls, and the value range is 350-450 pls.
And the compressor of the multi-connected air conditioner stops running.
And (4) exiting the action: and controlling the target supercooling degree of the indoor unit to recover to a default value.
The second method comprises the following steps: the method comprises the following steps of controlling the opening of an expansion valve of the outdoor unit to be too small in the heating process:
the method comprises the steps that the opening degree of an expansion valve of an outdoor unit is judged after the multi-connected air conditioner is started, oil return and load are switched for 5min, the judgment is carried out once at an interval t, system parameters are unstable when a press is in a quick frequency increasing stage in a starting stage, four-way valves for defrosting and oil return are reversed, system parameter transformation is large, EEV adjustment is in a quick adjusting stage, and at the moment, if other controls are involved, the probability of misadjustment is high.
And when the multi-connected air conditioner indoor unit enters a heating mode and the opening degree of an expansion valve of the outdoor unit is equal to the minimum opening degree, the multi-connected air conditioner indoor unit enters a control action. The minimum opening degree is related to the model, the optimal value is 100pls, and the value range is 60-150 pls.
The control actions include: and controlling the target supercooling degree of the indoor unit to increase by 1 degree, wherein the adjusting range cannot exceed the adjusting range in the parameter description (such as the adjustable range of the target supercooling degree of the indoor unit is 4-10 ℃). The opening degree of an outdoor unit expansion valve is the minimum, which means that the number of refrigerants entering an outdoor heat exchanger is large, the flow rate of the refrigerants needs to be reduced, at the moment, if the target supercooling degree value is increased, the valve of an indoor unit is closed to be small, the flow rate of the refrigerants is reduced, and the opening degree of an outdoor unit expansion valve is increased, and the explanation about the increase of the target supercooling degree by 1 ℃ is that the program can be identified once in 5min, if the target supercooling degree single change is selected to be too small, the expansion valve can not act for a long time, the supercooling degree and the expansion valve regulation fluctuation are caused by overlarge, and the change of the target supercooling degree is ensured to enable the expansion valve to respond quickly aiming at the actual supercooling degree of the indoor unit and 1 ℃.
The outdoor unit expansion valve with an excessively small opening controls the exit condition: and when the expansion valve is under the control of the over-small opening of the expansion valve of the heating outdoor unit and any one of the following conditions is met, the control of the over-small opening of the expansion valve of the heating outdoor unit is quitted.
When the multi-connected indoor unit enters a heating mode and the opening degree of an expansion valve of the outdoor unit is larger than e. The preferred values of e are the minimum opening +20pls, the minimum opening of the protection range to the minimum opening +50 pls.
And secondly, after the compressor of the multi-connected air conditioner stops running.
And (4) exiting action: and controlling the target supercooling degree of the indoor unit to recover the default value.
Example three:
corresponding to the method for controlling the expansion valve of a multi-connected air conditioner provided in the first embodiment, an embodiment of the present invention provides an expansion valve control device of a multi-connected air conditioner, which may be applied to a multi-connected air conditioner, and referring to a schematic structural diagram of an expansion valve control device of a multi-connected air conditioner as shown in fig. 3, the device includes the following modules:
the first detection module 31 is configured to detect whether the multi-connected air conditioner is in a heating operation mode.
And the second detection module 32 is configured to periodically detect the opening of an expansion valve of an outdoor unit of the multi-connected air conditioner when the multi-connected air conditioner is in the heating mode.
And the control module 33 is configured to control the opening of the expansion valve of the indoor unit of the multi-connected air conditioner when the opening of the expansion valve of the outdoor unit is greater than a first preset opening or smaller than a second preset opening.
According to the expansion valve control device of the multi-connected air conditioner, when the multi-connected air conditioner is operated in the heating mode, the opening degree of the expansion valve of the outdoor unit of the multi-connected air conditioner is periodically detected, and when the opening degree of the expansion valve of the outdoor unit is larger or smaller, the expansion valve of the outdoor unit is controlled in a linkage mode, so that the opening degree of the expansion valve of the outdoor unit is in a proper range, the return air superheat degree of the multi-connected air conditioner is in a controllable range, and the operation reliability of the multi-connected air conditioner is improved.
In an embodiment, the control module 33 is further configured to, when the opening degree of the expansion valve of the outdoor unit is greater than a first preset opening degree, obtain a target supercooling degree of the indoor unit of the multi-connected air conditioner, and control the target supercooling degree to decrease the first preset temperature, so as to increase the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner.
In an embodiment, the control module 33 is further configured to, when the opening degree of the expansion valve of the outdoor unit is decreased to be smaller than a third preset opening degree, or when the compressor of the multi-connected air conditioner stops operating, obtain a current target supercooling degree of the indoor unit of the multi-connected air conditioner, and control the current target supercooling degree to return to the preset target supercooling degree.
In an embodiment, the control module 33 is further configured to, when the opening degree of the outdoor unit expansion valve is smaller than a second preset opening degree, or when the opening degree of the outdoor unit expansion valve is equal to a preset minimum opening degree, obtain a target supercooling degree of an indoor unit of the multi-split air conditioner, and control the target supercooling degree to increase by a second preset temperature, so as to decrease the opening degree of the indoor unit expansion valve of the multi-split air conditioner.
In an embodiment, the control module 33 is further configured to, when the opening degree of the outdoor unit expansion valve is increased to be greater than or equal to a fourth preset opening degree, or when the compressor of the multi-connected air conditioner stops operating, acquire a current target supercooling degree of the indoor unit of the multi-connected air conditioner, and control the current target supercooling degree to return to the preset target supercooling degree.
In an embodiment, the second detecting module 32 is further configured to detect an opening degree of an expansion valve of an outdoor unit of the multi-connected air conditioner every second preset time when an operation time of the multi-connected air conditioner in the heating mode reaches a first preset time.
In an embodiment, the second predetermined time is 3 to 20 min.
The expansion valve control device for the multi-connected air conditioner provided by the embodiment can realize the adjustment of the opening degree of the expansion valve of the indoor unit by controlling the target supercooling degree of the indoor unit when the expansion valve of the outdoor unit is too large or too small, further realize the linkage adjustment of the expansion valve of the outdoor unit, can be suitable for the multi-connected air conditioners with different expansion valve types by setting the control target as the target supercooling degree, and improves the universality of the expansion valve control method of the multi-connected air conditioner.
Example four:
in correspondence to the method for controlling an expansion valve of a multi-connected air conditioner provided in the first embodiment, the present embodiment provides a multi-connected air conditioner including a computer readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed to implement the method for controlling an expansion valve of a multi-connected air conditioner provided in the first embodiment.
Example five:
the present embodiment further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the processes of the embodiment of the method for controlling an expansion valve of a multi-connected air conditioner, and can achieve the same technical effects, and in order to avoid repetition, the computer program is not described herein again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art can understand that all or part of the processes in the methods according to the above embodiments may be implemented by instructing a control device to implement the methods according to the above embodiments by a computer, and the program may be stored in a computer-readable storage medium, and when executed, the program may include the processes according to the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, or the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The expansion valve control device of the multi-connected air conditioner and the multi-connected air conditioner disclosed by the embodiment correspond to the expansion valve control method of the multi-connected air conditioner disclosed by the embodiment, so that the description is relatively simple, and relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A control method for an expansion valve of a multi-connected air conditioner is characterized by comprising the following steps:
detecting whether the multi-connected air conditioner is in a heating mode or not;
when the multi-connected air conditioner is in a heating mode, periodically detecting the opening of an outdoor unit expansion valve of the multi-connected air conditioner;
when the opening of the outdoor unit expansion valve is larger than a first preset opening or smaller than a second preset opening, controlling the opening of the indoor unit expansion valve of the multi-connected air conditioner;
when the opening degree of the expansion valve of the outdoor unit is larger than a first preset opening degree or smaller than a second preset opening degree, the step of controlling the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner comprises the following steps:
when the opening degree of the outdoor unit expansion valve is larger than the first preset opening degree, acquiring a target supercooling degree of an indoor unit of the multi-connected air conditioner, and controlling the target supercooling degree to reduce a first preset temperature so as to increase the opening degree of the indoor unit expansion valve of the multi-connected air conditioner;
when the opening degree of the expansion valve of the outdoor unit is reduced to be smaller than a third preset opening degree, or when the compressor of the multi-connected air conditioner stops running, acquiring the current target supercooling degree of the indoor unit of the multi-connected air conditioner, and controlling the current target supercooling degree to be restored to the preset target supercooling degree;
And when the opening degree of the outdoor unit expansion valve is smaller than the second preset opening degree, or when the opening degree of the outdoor unit expansion valve is equal to the preset minimum opening degree, acquiring a target supercooling degree of the indoor unit of the multi-connected air conditioner, and controlling the target supercooling degree to increase the second preset temperature so as to reduce the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner.
2. An expansion valve control method of a multi-connected air conditioner as claimed in claim 1, further comprising:
when the opening degree of the expansion valve of the outdoor unit is increased to be larger than or equal to a fourth preset opening degree, or when the compressor of the multi-connected air conditioner stops operating, the current target supercooling degree of the indoor unit of the multi-connected air conditioner is obtained, and the current target supercooling degree is controlled to be restored to the preset target supercooling degree.
3. The method for controlling expansion valves of a multi-connected air conditioner as claimed in claim 1, wherein the step of periodically detecting an opening degree of expansion valves of outdoor units of the multi-connected air conditioner when the multi-connected air conditioner is in a heating mode comprises:
and when the running time of the multi-connected air conditioner in the heating mode reaches a first preset time, detecting the opening of an expansion valve of an outdoor unit of the multi-connected air conditioner at intervals of a second preset time.
4. The expansion valve control method of a multi-connected air conditioner as claimed in claim 3, wherein the second preset time is set to a value ranging from 3 to 20 min.
5. An expansion valve control device of a multi-connected air conditioner is characterized by comprising:
the first detection module is used for detecting whether the multi-connected air conditioner is in a heating operation mode or not;
the second detection module is used for periodically detecting the opening of an expansion valve of an outdoor unit of the multi-connected air conditioner when the multi-connected air conditioner is in a heating mode;
the control module is used for controlling the opening of an expansion valve of an indoor unit of the multi-connected air conditioner when the opening of the expansion valve of the outdoor unit is larger than a first preset opening or smaller than a second preset opening;
the control module is used for acquiring a target supercooling degree of the indoor unit of the multi-connected air conditioner when the opening degree of the outdoor unit expansion valve is larger than the first preset opening degree, and controlling the target supercooling degree to reduce a first preset temperature so as to increase the opening degree of the indoor unit expansion valve of the multi-connected air conditioner;
when the opening degree of the expansion valve of the outdoor unit is reduced to be smaller than a third preset opening degree, or when the compressor of the multi-connected air conditioner stops running, acquiring the current target supercooling degree of the indoor unit of the multi-connected air conditioner, and controlling the current target supercooling degree to be restored to the preset target supercooling degree;
And when the opening degree of the outdoor unit expansion valve is smaller than the second preset opening degree, or when the opening degree of the outdoor unit expansion valve is equal to the preset minimum opening degree, acquiring a target supercooling degree of the indoor unit of the multi-connected air conditioner, and controlling the target supercooling degree to increase the second preset temperature so as to reduce the opening degree of the expansion valve of the indoor unit of the multi-connected air conditioner.
6. A multi-connected air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and executing the method of any one of claims 1 to 4.
7. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-4.
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| CN113739335B (en) * | 2021-09-03 | 2022-10-25 | 宁波奥克斯电气股份有限公司 | Control method for multi-split air conditioner refrigeration expansion valve and multi-split air conditioner |
| CN113819570B (en) * | 2021-10-20 | 2022-04-29 | 宁波奥克斯电气股份有限公司 | Multi-connected air conditioning system high pressure calculation method and multi-connected air conditioning system |
| CN115654712A (en) * | 2022-10-24 | 2023-01-31 | 宁波奥克斯电气股份有限公司 | Multi-connected air conditioner control method and device and multi-connected air conditioner |
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Effective date of registration: 20221014 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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