CN114811863A - Control method of multi-split air conditioner, controller, air conditioner and medium - Google Patents

Control method of multi-split air conditioner, controller, air conditioner and medium Download PDF

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Publication number
CN114811863A
CN114811863A CN202210533076.5A CN202210533076A CN114811863A CN 114811863 A CN114811863 A CN 114811863A CN 202210533076 A CN202210533076 A CN 202210533076A CN 114811863 A CN114811863 A CN 114811863A
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China
Prior art keywords
opening degree
throttling
indoor units
air conditioner
energy
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Granted
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CN202210533076.5A
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Chinese (zh)
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CN114811863B (en
Inventor
周壮
李健锋
廖振华
刘帅帅
李东
王军强
朱声浩
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GD Midea Air Conditioning Equipment Co Ltd
Midea Group Wuhan HVAC Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Midea Group Wuhan HVAC Equipment Co Ltd
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Priority to CN202210533076.5A priority Critical patent/CN114811863B/en
Publication of CN114811863A publication Critical patent/CN114811863A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a control method of a multi-split air conditioner, a controller, the air conditioner and a medium, wherein the control method comprises the steps of obtaining the current opening of first throttling equipment corresponding to an indoor unit which is not required under the condition that the operation mode of the multi-split air conditioner is a refrigeration mode and at least one indoor unit is switched from an energy-required state to an energy-unnecessary state, wherein the indoor unit is an indoor unit in the energy-unnecessary state; acquiring the number of indoor units which can be required, wherein the indoor units which can be required are in an energy-required state; and adjusting the opening degree of the first throttling equipment corresponding to the indoor units which are not required to be operated according to the number of the indoor units which are required to be operated and the current opening degree of the first throttling equipment. According to the technical scheme of the invention, the opening degree of the first throttling equipment corresponding to the indoor units which are not required is adjusted according to the number of the indoor units which are required and the current opening degree of the first throttling equipment, so that the condition that the return air pressure of the compressor is too low can be reduced, and the aim of improving the stability of the multi-split air conditioner system is fulfilled.

Description

Control method of multi-split air conditioner, controller, air conditioner and medium
Technical Field
The invention relates to the technical field of control of electronic expansion valves, in particular to a control method of a multi-split air conditioner, a controller, the air conditioner and a medium.
Background
In the process of refrigeration of the multi-split air conditioner, the opening degree of the electronic expansion valve of the indoor unit in the refrigeration operation is usually adjusted according to the superheat degree, when part of the indoor units are switched to a stop or standby state from the refrigeration operation, the electronic expansion valve of the part of the indoor units is usually adjusted from a relatively large opening degree to a closed state or a relatively small opening degree, so that the valve opening degree of the whole system is suddenly reduced, the return air pressure of the compressor is too low, and the low-pressure protection of the compressor is triggered, so that the stability of the multi-split air conditioner is reduced.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and provides a method for controlling a multi-split air conditioner, a controller, an air conditioner, and a computer readable storage medium, which can prevent the return air pressure of a compressor from being too low and trigger low pressure protection, thereby improving the stability of the multi-split air conditioner.
In a first aspect, an embodiment of the present invention provides a method for controlling a multi-split air conditioner, including:
when the operation mode of the multi-split air conditioner is a refrigeration mode and at least one indoor unit is switched from an energy-required state to an energy-unnecessary state, wherein the energy-required state represents a state in which the indoor environment temperature needs to be adjusted, and the energy-unnecessary state represents a state in which the indoor environment temperature does not need to be adjusted;
acquiring the current opening of first throttling equipment corresponding to an unavailable indoor unit, wherein the unavailable indoor unit is an indoor unit in an unavailable state;
acquiring the number of indoor units which are in energy and demand states;
and adjusting the opening degree of the first throttling equipment corresponding to the indoor machines without energy demand according to the number of the indoor machines with energy demand and the current opening degree of the first throttling equipment.
The information processing method provided by the embodiment of the invention has at least the following beneficial effects: under the condition that the operation mode of the multi-split air conditioner is a refrigeration mode and at least one indoor unit is switched from an energy-required state to an energy-unnecessary state, wherein the energy-required state represents a state requiring the adjustment of the indoor environment temperature, and the energy-unnecessary state represents a state not requiring the adjustment of the indoor environment temperature; acquiring the current opening of a first throttling device corresponding to an unavailable indoor unit, wherein the unavailable indoor unit is an indoor unit in an unavailable state; acquiring the number of indoor units which can be required, wherein the indoor units which can be required are in an energy-required state; and adjusting the opening degree of the first throttling equipment corresponding to the indoor units which are not required to be operated according to the number of the indoor units which are required to be operated and the current opening degree of the first throttling equipment. According to the technical scheme of the invention, the opening degree of the first throttling equipment corresponding to the indoor units which are not required can be adjusted according to the number of the indoor units which are required and the current opening degree of the first throttling equipment, so that the condition that the return air pressure of the compressor is too low can be reduced, low-pressure protection is prevented from being triggered, and the stability of the multi-split system is improved.
According to some embodiments of the present invention, the adjusting the opening degree of the first throttling device corresponding to the indoor units without energy demand according to the number of indoor units with energy demand and the current opening degree of the first throttling device includes:
and under the condition that the number of the indoor units which can be required is at least one and the current opening of the first throttling equipment is not 0, after the opening of the first throttling equipment is kept for a first preset time, the first throttling equipment is adjusted to 0 from the current opening.
According to some embodiments of the invention, in the case where the number of the capable indoor units is one, the method further comprises:
and increasing the opening degree of the second throttling equipment corresponding to the indoor unit which can be needed to be operated to a first preset opening degree.
According to some embodiments of the present invention, the adjusting the opening degree of the first throttling device corresponding to the indoor units without energy demand according to the number of indoor units with energy demand and the current opening degree of the first throttling device includes:
and under the condition that the number of the indoor units with energy and demands is 0 and the current opening of the first throttling equipment is not 0, after the current opening of the first throttling equipment is maintained for a second preset time, obtaining the number of the indoor units with energy and demands, and adjusting the opening of the first throttling equipment according to the number of the indoor units with energy and demands.
According to some embodiments of the invention, the adjusting the opening degree of the first throttling device according to the number of the indoor units with capacity comprises:
under the condition that the number of the indoor units which can be needed is 0, after the current opening degree of the first throttling equipment is kept for a third preset time, the opening degree of the first throttling equipment is adjusted to be 0;
alternatively, the first and second electrodes may be,
and under the condition that the number of the indoor units with the capacity is not 0, adjusting the opening degree of the first throttling equipment to be 0.
According to some embodiments of the present invention, the adjusting the opening degree of the first throttling device corresponding to the indoor units without energy demand according to the number of indoor units with energy demand and the current opening degree of the first throttling device includes:
and under the condition that the number of the indoor units which can be required is at least one and the current opening degree of the first throttling equipment is 0, maintaining the current opening degree of the first throttling equipment.
According to some embodiments of the present invention, the adjusting the opening degree of the first throttling device corresponding to the indoor units without energy demand according to the number of indoor units with energy demand and the current opening degree of the first throttling device includes:
and under the condition that the number of the indoor units which need energy is 0 and the current opening of the first throttling equipment is 0, adjusting the opening of the first throttling equipment to a second preset opening.
According to some embodiments of the invention, the method further comprises:
when the operation mode is a heating mode, after the current opening degree of the first throttling equipment is kept for a fourth preset time, the opening degree of the first throttling equipment is adjusted to a third preset opening degree;
alternatively, the first and second electrodes may be,
and adjusting the opening degree of the first throttling device to a fourth preset opening degree when the operation mode is switched from the non-heating mode to the heating mode.
In a second aspect, an embodiment of the present invention provides an operation control apparatus, including at least one control processor and a memory, which is communicatively connected to the at least one control processor; the memory stores instructions executable by the at least one control processor to enable the at least one control processor to perform the method of controlling a multi-split air conditioner according to the first aspect.
In a third aspect, an embodiment of the present invention provides an air conditioner, including the controller in the second aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to cause a computer to execute the method for controlling an on-line aircrew according to the first aspect.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
The invention is further described below with reference to the accompanying drawings and examples;
fig. 1 is a schematic diagram of a system architecture platform for performing a control method of a multi-split air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic configuration diagram of an air conditioner for performing a control method of a multi-split air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of a multi-split air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of a multi-split air conditioner according to another embodiment of the present invention;
FIG. 5 is a flowchart of a specific method of step S300 in FIG. 3;
FIG. 6 is a flow chart of another specific method of step S300 in FIG. 3;
fig. 7 is a flowchart of another specific method of step S300 in fig. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the description of the methods may be transposed or transposed in order, as will be apparent to a person skilled in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
In the description of the present invention, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the present number, and greater than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the process of refrigeration of the multi-split air conditioner, the opening degree of the electronic expansion valve of the indoor unit in the refrigeration operation is usually adjusted according to the superheat degree, when part of the indoor units are switched to a stop or standby state from the refrigeration operation, the electronic expansion valve of the part of the indoor units is usually adjusted from a relatively large opening degree to a closed state or a relatively small opening degree, so that the valve opening degree of the whole system is suddenly reduced, the return air pressure of the compressor is too low, and the low-pressure protection of the compressor is triggered, so that the stability of the multi-split air conditioner is reduced.
Based on the above situation, an embodiment of the present invention provides a control method of a multi-split air conditioner, a controller, an air conditioner, and a computer-readable storage medium, where the control method of the air conditioner includes, but is not limited to, the following steps: under the condition that the operation mode of the multi-split air conditioner is a refrigeration mode and at least one indoor unit is switched from an energy-required state to an energy-unnecessary state, acquiring the current opening of first throttling equipment corresponding to the energy-unnecessary indoor unit, wherein the energy-unnecessary indoor unit is an indoor unit in the energy-unnecessary state; acquiring the number of indoor units which can be required, wherein the indoor units which can be required are in an energy-required state; and adjusting the opening degree of the first throttling equipment corresponding to the indoor units which are not required to be operated according to the number of the indoor units which are required to be operated and the current opening degree of the first throttling equipment. According to the technical scheme, the opening degree of the first throttling equipment corresponding to the unavailable indoor unit is adjusted according to the number of the available indoor units and the current opening degree of the first throttling equipment corresponding to the unavailable indoor units, so that the condition that the return air pressure of the compressor is too low can be reduced, low-pressure protection is prevented from being triggered, and the stability of the multi-split system is improved.
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1, fig. 1 is a schematic diagram of a system architecture platform for performing a control method of a multi-split air conditioner according to an embodiment of the present invention.
The system architecture platform 1000 of the present invention includes one or more processors 1001 and a memory 1002, and fig. 1 illustrates one processor 1001 and one memory 1002 as an example.
The processor 1001 and the memory 1002 may be connected by a bus or other means, such as the bus shown in fig. 1.
The memory 1002, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer-executable programs. Further, the memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 1002 optionally includes memory 1002 located remotely from processor 1001, which may be connected to system architecture platform 1000 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Those skilled in the art will appreciate that the device architecture shown in FIG. 1 does not constitute a limitation of system architecture platform 1000, and may include more or fewer components than those shown, or some components in combination, or a different arrangement of components.
In the system architecture platform 1000 shown in fig. 1, the processor 1001 may be configured to call an air conditioner external unit defrosting control program stored in the memory 1002, so as to implement a control method of a multi-split air conditioner.
Based on the hardware structure of the system architecture platform 1000, various embodiments of the air conditioner of the present invention are proposed.
Specifically, referring to fig. 2, the multi-split air conditioner according to the embodiment of the present invention includes, but is not limited to, a compressor 210, an outdoor heat exchanger 220, a throttling device 240, and an indoor heat exchanger 230, which are sequentially communicated, and a controller (not shown in the figure), in which a plurality of sets of refrigerant passages of the throttling device 240 and the indoor heat exchanger 230 are arranged in parallel, the controller is in communication connection with the compressor 210 and the throttling device 240, respectively, and the controller may include a processor 1001 and a memory 1002 as shown in fig. 1.
It should be noted that the outdoor heat exchanger 220 may be an evaporator, or may be other devices with heat exchange capability, and the embodiment is not limited thereto. It can be understood that the outdoor heat exchanger 220 serves as a condensation end for dissipating heat from the refrigerant in the cooling mode, and serves as an evaporation end for absorbing heat from the refrigerant in the heating mode.
The throttle device 240 may be an electronic expansion valve, or may be another throttle device 240 capable of adjusting the opening degree, and this embodiment is not particularly limited thereto.
It should be noted that the number of the throttling devices 240 and the indoor heat exchangers 230 is set according to actual needs, and the present embodiment does not specifically limit the number.
Based on the above module hardware structure of the air conditioner, embodiments of the control method of the multi-split air conditioner of the present invention are provided.
As shown in fig. 3, fig. 3 is a flowchart of a control method of a multi-split air conditioner according to an embodiment of the present invention. The control method of the air conditioner of the embodiment of the invention includes, but is not limited to, step S100, step S200 and step S300.
Step S100, under the condition that the operation mode of the multi-split air conditioner is a refrigeration mode and at least one indoor unit is switched from an energy-required state to an energy-unnecessary state, wherein the energy-required state represents a state in which the indoor environment temperature needs to be adjusted, and the energy-unnecessary state represents a state in which the indoor environment temperature does not need to be adjusted; and acquiring the current opening of the first throttling equipment corresponding to the unavailable indoor unit, wherein the unavailable indoor unit is an indoor unit in an unavailable state.
Specifically, when it is detected that one or more indoor units are switched from an energy-requiring state to an energy-requiring state in a cooling mode of the multi-split air conditioner, a current opening degree of a first throttling device corresponding to an energy-requiring indoor unit needs to be acquired, and it may be determined whether the energy-requiring indoor unit corresponding to the first throttling device is an indoor unit kept in an energy-requiring state or an indoor unit switched from an energy-requiring state to an energy-requiring state according to the current opening degree, for example: the current opening degree is 0, which indicates that the indoor unit is in a closed state; another example is: the current opening is not 0, which indicates that the indoor unit is changed from the energy-demand state to the energy-demand state.
The cooling mode refers to an operation mode arbitrarily set to reduce the temperature of the indoor environment in the related art, and the indoor units that are required and required may be indoor units in a cooling operation state, the indoor units that are not required may be indoor units that are switched from a state that is required and required to a state that is not required and may also be indoor units in a closed state; the indoor unit in the no-demand state may be an indoor unit in an off state or a standby state. It can be understood that, in operation, the indoor unit in the standby state is not required to determine that the current indoor environment temperature meets the preset temperature value, so as to enter the operating state or the standby state.
The first throttle device may be an electronic expansion valve, or may be a throttle device whose opening degree can be controlled by a controller, and this embodiment is not particularly limited thereto.
And step S200, acquiring the number of the indoor units which can be needed, wherein the indoor units which can be needed are indoor units in an energy-needed state.
Specifically, the number of the indoor units which can be used for energy and demand can be obtained through a controller in the multi-split air conditioner system, and the total opening degree change condition of the throttling equipment in the multi-split air conditioner system can be judged and obtained according to the number of the indoor units which can be used for energy and demand.
In the cooling mode, the indoor unit is in a cooling working state, and when a refrigerant enters the indoor unit and absorbs heat in the environment, the indoor environment temperature of the indoor unit can be reduced.
And step S300, adjusting the opening degree of the first throttling equipment corresponding to the indoor units which are not required according to the number of the indoor units which are required to be required and the current opening degree of the first throttling equipment.
In particular, the total opening degree change condition of the throttling equipment in the multi-split air conditioner system can be judged according to the number of the required indoor units, according to the current opening, whether the indoor machine without energy requirement corresponding to the first throttling equipment is the indoor machine kept in the state without energy requirement or the indoor machine converted from the state with energy requirement to the state without energy requirement can be judged, then according to the number of the indoor machines with energy requirement and the current opening of the first throttling equipment, the opening of the first throttling equipment corresponding to the indoor machine without energy requirement is adjusted, the change condition of the total opening of the throttling equipment in the system can be fully considered, then the aperture of first throttling equipment is adjusted, can guarantee that the total aperture of throttling equipment can not diminish suddenly in the in-process system that compressor power descends, can effectively avoid the return-air pressure of compressor to hang down excessively, can not trigger low pressure protection to reach the purpose that improves system stability.
In the embodiment of steps S100 to S300, in the cooling mode, when the indoor unit is switched from the energy-requiring state to the energy-requiring state, the current opening degree of the first throttling device corresponding to the energy-requiring indoor unit is obtained, the number of the indoor units in the energy-requiring state is obtained, and the opening degree of the first throttling device corresponding to the energy-requiring indoor unit is adjusted according to the number of the energy-requiring indoor units and the current opening degree of the first throttling device. The method comprises the steps of obtaining the current opening degree of first throttling equipment corresponding to the indoor machines which do not need energy, obtaining the number of the indoor machines which need energy, and adjusting the opening degree of the first throttling equipment corresponding to the indoor machines which do not need energy according to the number of the indoor machines which need energy and the current opening degree of the first throttling equipment. In the technical scheme of this embodiment, the opening degree of the first throttling device corresponding to the indoor units which are not required can be adjusted according to the number of the indoor units which are required and the current opening degree of the first throttling device, so that the condition that the return air pressure of the compressor is too low can be reduced, and the purpose of improving the stability of the multi-split system is achieved.
It should be noted that, when the frequency of the compressor is constant, the smaller the opening degree of the throttling devices in the system is, the larger the resistance is, the lower the return air pressure of the compressor is, and therefore, when the indoor unit is switched from the energy-needed state to the energy-unavailable state, the opening degree of the first throttling device corresponding to the energy-unavailable indoor unit can be adjusted according to the number of the energy-needed indoor units and the current opening degree of the first throttling device corresponding to the energy-unavailable indoor unit, so that the situation that the return air pressure of the compressor is too low can be reduced, and the purpose of improving the system stability can be achieved.
It should be further noted that, according to the technical solution of this embodiment, the change of the total opening degree of the throttling device in the multi-split air conditioner system can be fully considered, and the control difficulty is reduced through the control flow of the control method, so that the cost of the multi-split air conditioner can be reduced, and the purpose of improving the system stability can be achieved.
Referring to fig. 4, step S300 includes, but is not limited to, the following step S410.
And step S410, under the condition that the number of the indoor units which can be needed is at least one and the current opening of the first throttling equipment is not 0, keeping the opening of the first throttling equipment for a first preset time, and then adjusting the current opening of the first throttling equipment to 0.
Specifically, when the current opening degree of the first throttling device is not 0, it is described that the unnecessary indoor unit corresponding to the first throttling device is an unnecessary indoor unit that is converted from an energy-required state to an energy-unnecessary state, the compressor may reduce the frequency, and the total opening degree of the throttling device in the system suddenly decreases, which may result in too low return air pressure.
It should be noted that the first preset time may be preset in a manual manner or an automatic control manner by a controller, and the first preset time may be set according to a frequency reduction time of the compressor, a refrigeration time of the indoor unit, and the like, which is not limited in this embodiment.
In the embodiment of step S410, after the first preset time, the opening of the first throttling device is adjusted to 0, after the first preset time, in response to a signal that the indoor unit corresponding to the first throttling device is switched from the energy-needed state to the energy-not-needed state, the compressor has reduced the frequency for a period of time, and at this time, adjusting the opening of the first throttling device can reduce the condition that the return air pressure of the compressor is too low, thereby achieving the purpose of improving the system stability.
Referring to fig. 4, in the case where there is one capable indoor unit, the method includes, but is not limited to, the following step S510.
Step S510, increasing the opening of the second throttling device corresponding to the indoor unit to a first preset opening.
Specifically, when only one indoor unit is required and there are a plurality of indoor units which need to be switched to an unnecessary state, the opening degree of the first throttling device corresponding to the unnecessary indoor unit can be immediately reduced or closed, or reduced or closed after time delay, in order to reduce the change of the total opening degree of the throttling devices in the system, the opening degree of the second throttling device corresponding to the required indoor unit is increased to a first preset opening degree, and the condition that the return air pressure is too low when the compressor reduces the frequency can be reduced.
It should be noted that the first preset opening degree may be an opening degree value after the second throttling device completes the reset operation when the indoor unit receives the refrigeration signal, and the reset operation may be directly increasing the opening degree of the indoor unit corresponding to the second throttling device to the first preset opening degree, or may be completely closing the opening degree of the indoor unit corresponding to the second throttling device and then opening the opening degree to the first preset opening degree. The first preset opening degree may be preset according to, for example, a down-conversion speed of the compressor, a cooling speed of the indoor unit, and the like, and is set to, for example, 60% to 70% of the total opening degree, that is, 60% to 70% of 480 steps, which is not specifically limited herein.
In an embodiment, in the cooling mode, the opening degree of the second throttling device corresponding to the indoor unit is 30% of the total opening degree. If only one indoor unit is required, if the indoor unit is required to have a smaller opening degree currently and the opening degree of the first throttling device corresponding to the indoor unit is not required to be 0, the refrigerant flowing in the whole system can only flow through the smaller opening degree, and the return air pressure of the compressor is too low. Therefore, the opening degree of the second throttling device corresponding to the indoor unit can be increased to the first preset opening degree, and the condition that the return air pressure of the compressor is too low can be reduced.
In the embodiment of step S510, the opening degree of the second throttling device is increased to the first preset opening degree, and the total opening degree of the throttling devices in the multi-split air conditioner system does not suddenly become too small regardless of the opening degree change condition of the first throttling device corresponding to the indoor unit, so that the condition that the return air pressure of the compressor is too low can be reduced, and the purpose of improving the system stability is achieved.
Referring to fig. 5, step S300 further includes, but is not limited to, the following steps S610 and S620.
In step S610, under the condition that the number of the indoor units which can be required is 0 and the current opening degree of the first throttling device is not 0, the number of the indoor units which can be required is obtained after the current opening degree of the first throttling device is maintained for a second preset time.
And step S620, adjusting the opening of the first throttling equipment according to the number of the indoor units which can be needed.
Specifically, the number of the indoor units with energy and demand is 0, the current opening degree of the first throttling device is not 0, all the indoor units in the current system are in an energy-free state, and the indoor units corresponding to the first throttling device are the indoor units which are switched from the energy-free state to the energy-free state, so that in order to avoid that the frequency of the compressor is not reduced, the opening degree of the throttling device is already reduced, and therefore the return air pressure of the compressor is too low, the current opening degree of the first throttling device needs to be maintained for a second preset time; and then acquiring the number of the indoor units which can be used and need the capacity, and adjusting the opening of the first throttling device according to the number of the indoor units which can be used and need the capacity, so that the condition that the return air pressure of the compressor is too low is avoided.
It should be noted that the second preset time may be preset in a manual mode or an automatic control mode of the controller, and the second preset time may be set according to the frequency reduction time of the compressor, the refrigeration time of the indoor unit, and the like, which is not limited specifically herein.
It should be further noted that, after the current opening degree of the first throttling device is maintained for the second preset time, the number of the indoor units with capacity and demand is obtained, and the indoor units with capacity and demand at this time may be the indoor units which are controlled by a person or a controller to convert the indoor units from the state without capacity to the state with capacity and demand.
To further explain step S620, step S620 may also include the following two cases:
under the condition that the number of the indoor units which can be needed is 0, after the current opening degree of the first throttling equipment is kept for the third preset time, the opening degree of the first throttling equipment is adjusted to be 0.
Specifically, the number of the indoor units which are required to be available is 0, that is, all the indoor units in the multi-split air conditioner system are in an unavailable state, in order to enable the multi-split air conditioner system to reach pressure balance after the compressor is in a shutdown state, the problem that the compressor is damaged due to the fact that pressure difference exists between the exhaust end and the return end of the compressor when the multi-split air conditioner system is restarted is avoided, the pressure of the system reaches a balance value after the current opening of the first throttling device is kept for a third preset time, at the moment, the opening of the first throttling device is adjusted to be 0, and the purpose of improving the stability of the system can be achieved.
And in the second scenario, when the number of the indoor units which can be needed is not 0, the opening degree of the first throttling device is adjusted to be 0.
Specifically, the number of the indoor units required by the energy is not 0, that is, the indoor units in the energy-required state exist in the multi-split air conditioner system, at this time, the frequency of the compressor is reduced, the return air pressure is reduced, and since the indoor units still need to reduce the temperature of the indoor environment of the indoor units and do not need to balance the pressure, the opening degree of the first throttling device can be directly adjusted to 0, so that the purpose of avoiding the too low return air pressure of the compressor is achieved.
It should be noted that the third preset time may be preset in a manual manner or an automatic control manner by a controller, and the third preset time may be set according to a frequency reduction time of the compressor, a refrigeration time of the indoor unit, and the like, which is not limited specifically herein. The opening degree of the first throttling equipment is adjusted according to the number of the indoor units in the multi-split air-conditioning system, and because the current opening degree of the first throttling equipment is maintained for the second preset time, the compressor reduces the frequency at the moment, and the opening degree of the first throttling equipment is adjusted to 0, so that the return air pressure of the compressor cannot be too low.
In the embodiment including the above two scenarios, after the second preset time, the opening of the first throttling device is adjusted according to the number of the indoor units which can be needed, and the compressor reduces the frequency at the moment, so that the condition that the return air pressure of the compressor is too low can be effectively reduced, and the purpose of improving the system stability is achieved.
In the embodiments from step S610 to step S620, when all the indoor units in the multi-split air conditioner system are in an energy-inessential state, the current opening of the first throttling device needs to be maintained for the second preset time, so as to reduce the situation that the return air pressure is too low due to the excessive change of the opening of the throttling device and the incomplete frequency reduction of the compressor, thereby achieving the purpose of improving the system stability.
It should be noted that when all the indoor units in the multi-split air conditioner system are in an energy-inessential state, the opening degree of the first throttling device can be adjusted to 0 only when the compressor is stopped down, so as to reduce the condition of pressure imbalance; when the energy-demand indoor unit exists in the multi-split air conditioner system, the first throttling device can be directly adjusted to 0, the condition that the return air pressure is too low is reduced, and the energy-demand indoor unit exists, namely, the indoor unit still needs to adjust the temperature of the indoor environment, and the pressure in the front and the back of the throttling device does not need to be balanced.
Referring to fig. 6, step S300 further includes, but is not limited to, the following step S810.
And step S810, keeping the current opening degree of the first throttling equipment under the condition that the number of the indoor units which can be needed is at least one and the current opening degree of the first throttling equipment is 0.
Specifically, the number of the indoor units which can be required is at least one, the current opening degree of the first throttling device is 0, the opening degree of the first throttling device is already 0, the indoor units which can be required still exist in the current multi-split air conditioner system, the total opening degree of the throttling devices in the system does not need to be changed, and only the opening degree of the first throttling device needs to be maintained.
The current opening degree of the first throttling device is 0, and the nonexistent indoor unit corresponding to the first throttling device is an indoor unit which is switched from the energy-requiring state to the energy-nonexistent state.
In the embodiment of step S810, the opening degree of the first throttling device is already 0, and an indoor unit that can be needed still exists in the current multi-split air conditioner system, and only the current opening degree of the first throttling device needs to be maintained, so that the situation that the return air pressure of the compressor in the multi-split air conditioner system is too low is not caused, and the opening degree of the first throttling device also meets the target opening degree of the indoor unit that cannot be needed in the multi-split air conditioner system, thereby achieving the purpose of improving the system stability.
Referring to fig. 7, step S300 further includes, but is not limited to, the following step S910.
In step S910, when the number of the indoor units that can be operated is 0 and the current opening of the first throttling device is 0, the opening of the first throttling device is adjusted to a second preset opening.
Specifically, the number of the indoor units with energy demand is 0, the current opening degree of the first throttling device is 0, all the indoor units in the system are in an energy-nonexistence state, the current opening degree of the first throttling device is already 0, and in order to bypass the pressure of the multi-split air conditioner system, the multi-split air conditioner system is prevented from being started with differential pressure, and the opening degree of the first throttling device is adjusted to be a second preset opening degree.
It should be noted that the current opening degree of the first throttling device is 0, that is, the no-energy-requirement indoor unit corresponding to the first throttling device is not converted from the energy-requirement state to the no-energy-requirement state, the second preset opening degree refers to a larger opening degree, the second preset opening degree may be a total opening degree of the throttling device, that is, the second preset opening degree may be 480 steps, and the second preset opening degree may also be other larger opening degrees, which is not specifically limited herein.
In the embodiment of step S910, after the compressor is stopped, in order to bypass the pressure of the multi-split air conditioner system and avoid the start of the multi-split air conditioner system with a pressure difference, when all the indoor units in the multi-split air conditioner system are in an unnecessary state and the opening degree of the first throttling device is 0, the opening degrees of the throttling devices need to be restored to a larger standby opening degree, so as to achieve the purpose of improving the system stability.
It is worth pointing out that when all the indoor units in the multi-split air conditioner system are in the no-energy-requirement state, and the opening degrees of the first throttling devices corresponding to the no-energy-requirement indoor units are all 0, when the compressor is stopped, the opening degrees of the first throttling devices need to be all restored to the second preset opening degree, namely, the larger opening degree value, so that the pressure of the multi-split air conditioner system can be bypassed, the multi-split air conditioner system is prevented from being started with differential pressure, and the purpose of improving the stability of the system is achieved.
In another embodiment, in the case where the operation mode is the heating mode, the opening degree of the first throttling device is adjusted to a third preset opening degree after maintaining the current opening degree of the first throttling device for a fourth preset time. Specifically, in the heating mode, the indoor units are equivalent to condensers, the compressors are subjected to frequency reduction when at least one indoor unit is switched from an energy-requiring state to an energy-requiring state, a large amount of gas-liquid two-phase refrigerants are still in the outdoor unit which is switched from the energy-requiring state to the energy-requiring state, the refrigerants pass through the throttling equipment, and if the opening degree of the throttling equipment is immediately closed, the gas-liquid two-phase refrigerants generate strong noise near the throttling equipment. Therefore, after the current opening degree of the first throttling device is maintained for the fourth preset time, the opening degree of the first throttling device is adjusted to the third preset opening degree.
In another embodiment, in the case where the operation mode of the multi-split air conditioner is switched from the non-heating mode to the heating mode, the opening degree of the first throttling device is directly adjusted to the fourth preset opening degree without waiting.
Specifically, when the operation mode is switched from the non-heating mode to the current heating mode, the effect of the indoor unit changes, in an optional embodiment, when the operation mode is switched from the cooling mode to the heating mode, a gas-liquid two-phase refrigerant does not exist at the indoor unit to generate large noise, and when at least one indoor unit is switched from an energy-demand state to an energy-demand-free state, the opening degree of the first throttling device can be directly adjusted to a fourth preset opening degree.
It should be noted that the fourth preset time may be preset in a manual manner or an automatic control manner by a controller, and the fourth preset time may be set according to a frequency reduction time of the compressor, a refrigeration time of the indoor unit, and the like, which is not limited specifically herein. The third preset opening degree and the fourth preset opening degree may both be smaller opening degree values, for example, the third preset opening degree and the fourth preset opening degree may both be 96 steps. The non-heating mode refers to any operation mode except the heating mode, such as a cooling mode, and is not particularly limited herein.
An embodiment of the present invention also provides a controller including: a processor, a memory, and a computer program stored on the memory and executable on the processor.
The processor and memory may be connected by a bus or other means.
It should be noted that the controller in this embodiment may include a processor and a memory as in the embodiment shown in fig. 1, both belong to the same inventive concept, and therefore both have the same implementation principle and beneficial effect, and are not described in detail herein.
Non-transitory software programs and instructions required to implement the control method of the multi-split air conditioner of the above-described embodiment are stored in the memory, and when executed by the processor, the control method of the multi-split air conditioner of the above-described embodiment is performed.
In addition, the embodiment of the invention also provides an air conditioner, which comprises the controller.
It is to be noted that, since the air conditioner according to the embodiment of the present invention has the controller according to the above-described embodiment, and the controller according to the above-described embodiment is capable of executing the control method of the multi-split air conditioner according to the above-described embodiment, the specific implementation and technical effects of the air conditioner according to the embodiment of the present invention may refer to the specific implementation and technical effects of the control method of the multi-split air conditioner according to any of the above-described embodiments.
Embodiments of the present invention also provide a computer-readable storage medium storing computer-executable instructions for performing the above-described method for controlling a multi-split air conditioner, for example, executed by one processor 1001 in fig. 1, which may cause the above-described one or more processors to perform the method for controlling a multi-split air conditioner in the above-described method embodiments, for example, to perform the above-described method steps S100 to S300 in fig. 3, method step S410 in fig. 4, method step S100, step S200, step S410 and step S510 in fig. 4, method steps S610 to S620 in fig. 5, method step S100, step S200, and step S810 in fig. 6, method step S100, step S200, and step S910 in fig. 7.
The above-described embodiments of the apparatus are merely illustrative, and the units illustrated as separate components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network nodes. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer readable storage media (or non-transitory media) and communication media (or transitory media). The term computer-readable storage medium includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer-readable storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.

Claims (11)

1. A control method of a multi-split air conditioner is characterized by comprising the following steps:
when the operation mode of the multi-split air conditioner is a refrigeration mode and at least one indoor unit is switched from an energy-required state to an energy-unnecessary state, wherein the energy-required state represents a state in which the indoor environment temperature needs to be adjusted, and the energy-unnecessary state represents a state in which the indoor environment temperature does not need to be adjusted;
acquiring the current opening of first throttling equipment corresponding to an unavailable indoor unit, wherein the unavailable indoor unit is an indoor unit in an unavailable state;
acquiring the number of indoor units which are in energy and demand states;
and adjusting the opening degree of the first throttling equipment corresponding to the indoor machines without energy demand according to the number of the indoor machines with energy demand and the current opening degree of the first throttling equipment.
2. The method for controlling a multi-split air conditioner according to claim 1, wherein the adjusting the opening degree of the first throttling device corresponding to the non-required indoor units according to the number of the required indoor units and the current opening degree of the first throttling device comprises:
and under the condition that the number of the indoor units which can be required is at least one and the current opening of the first throttling equipment is not 0, after the opening of the first throttling equipment is kept for a first preset time, the first throttling equipment is adjusted to 0 from the current opening.
3. The method of controlling a multi-split air conditioner as claimed in claim 2, wherein in case that the number of the available and required indoor units is one, the method further comprises:
and increasing the opening degree of the second throttling equipment corresponding to the indoor unit which can be needed to be operated to a first preset opening degree.
4. The method for controlling a multi-split air conditioner according to claim 1, wherein the adjusting the opening degree of the first throttling device corresponding to the non-required indoor units according to the number of the required indoor units and the current opening degree of the first throttling device comprises:
under the condition that the number of the indoor units with capacity and demand is 0 and the current opening degree of the first throttling equipment is not 0, maintaining the current opening degree of the first throttling equipment for a second preset time, and then obtaining the number of the indoor units with capacity and demand;
and adjusting the opening degree of the first throttling equipment according to the number of the indoor units which have the capacity to need.
5. The method for controlling a multi-split air conditioner according to claim 4, wherein the adjusting the opening degree of the first throttling device according to the number of the indoor units capable of requiring energy comprises:
under the condition that the number of the indoor units which can be needed is 0, after the current opening degree of the first throttling equipment is kept for a third preset time, the opening degree of the first throttling equipment is adjusted to be 0;
alternatively, the first and second electrodes may be,
and under the condition that the number of the indoor units with the capacity is not 0, adjusting the opening degree of the first throttling equipment to be 0.
6. The method for controlling a multi-split air conditioner according to claim 1, wherein the adjusting the opening degree of the first throttling device corresponding to the non-required indoor units according to the number of the required indoor units and the current opening degree of the first throttling device comprises:
and under the condition that the number of the indoor units which can be required is at least one and the current opening degree of the first throttling equipment is 0, maintaining the current opening degree of the first throttling equipment.
7. The method for controlling a multi-split air conditioner according to claim 1, wherein the adjusting the opening degree of the first throttling device corresponding to the non-required indoor units according to the number of the required indoor units and the current opening degree of the first throttling device comprises:
and under the condition that the number of the indoor units which need energy is 0 and the current opening of the first throttling equipment is 0, adjusting the opening of the first throttling equipment to a second preset opening.
8. The control method of a multi-split air conditioner as set forth in claim 1, further comprising:
when the operation mode is a heating mode, after the current opening degree of the first throttling equipment is kept for a fourth preset time, the opening degree of the first throttling equipment is adjusted to a third preset opening degree;
alternatively, the first and second electrodes may be,
and adjusting the opening degree of the first throttling device to a fourth preset opening degree when the operation mode is switched from the non-heating mode to the heating mode.
9. A controller comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the method of controlling a multi-split air conditioner as claimed in any one of claims 1 to 8 when executing the computer program.
10. An air conditioner characterized by comprising the controller according to claim 9.
11. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method of controlling a multi-split air conditioner according to any one of claims 1 to 8.
CN202210533076.5A 2022-05-16 2022-05-16 Control method of multi-split air conditioner, controller, air conditioner and medium Active CN114811863B (en)

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