CN112963944A - Multi-connected air conditioner control system, method and device and storage medium - Google Patents
Multi-connected air conditioner control system, method and device and storage medium Download PDFInfo
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- CN112963944A CN112963944A CN202110330125.0A CN202110330125A CN112963944A CN 112963944 A CN112963944 A CN 112963944A CN 202110330125 A CN202110330125 A CN 202110330125A CN 112963944 A CN112963944 A CN 112963944A
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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
- F24F11/46—Improving electric energy efficiency or saving
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention relates to the technical field of multi-connected air conditioning systems, and discloses a multi-connected air conditioning control system, a method, a device and a storage medium, wherein a first port of an auxiliary four-way valve of the multi-connected air conditioning system is connected with an inlet pipe of an outdoor heat exchanger, and a third port of the auxiliary four-way valve is connected with an outlet pipe of the outdoor heat exchanger, and the method comprises the following steps: when the multi-connected air conditioning system is in a refrigerating or heating mode, acquiring an energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air conditioning system; acquiring the working state of a main four-way valve; the working state of the auxiliary four-way valve is adjusted according to the energy demand ratio and the working state of the main four-way valve so as to realize the switching of the heat exchange modes of the outdoor heat exchanger.
Description
Technical Field
The invention relates to the technical field of multi-connected air conditioning systems, in particular to a multi-connected air conditioning control system, method and device and a storage medium.
Background
With the rapid development of the air conditioning industry, the air conditioning industry is subjected to energy efficiency upgrading for many times, the energy efficiency requirement is higher and higher, the heat exchange efficiency of a heat exchanger of an air conditioning system is critical to the energy efficiency of the whole machine, and therefore the heat exchange efficiency of the heat exchanger is also required to be higher and higher.
In the existing air conditioning system, the design of an outdoor unit heat exchanger is usually fixed to adopt a heating, countercurrent and cooling cocurrent heat exchange mode, and the outdoor unit heat exchanger cannot perform free switching of cocurrent, countercurrent and heat exchange.
Disclosure of Invention
The invention provides a multi-connected air conditioner control system, method, device and storage medium, and aims to solve the technical problem that the existing outdoor unit heat exchanger cannot perform free switching of forward flow and reverse flow heat exchange.
In order to achieve the above object, the present invention further provides a multi-connected air conditioning system, which includes an outdoor heat exchanger, a main four-way valve, an auxiliary four-way valve and an indoor unit, wherein a first port of the auxiliary four-way valve is connected to an inlet pipe of the outdoor heat exchanger, a second port of the auxiliary four-way valve is connected to the main four-way valve, a third port of the auxiliary four-way valve is connected to an outlet pipe of the outdoor heat exchanger, and a fourth port of the auxiliary four-way valve is connected to a pipeline between the main four-way valve and the indoor unit.
Optionally, the multi-connected air conditioning system further includes a low pressure stop valve, a throttling component and a high pressure stop valve, the first port of the main four-way valve is connected to the indoor unit through the low pressure stop valve, the second port of the auxiliary four-way valve is connected to the second port of the main four-way valve, and the fourth port of the auxiliary four-way valve is connected to the indoor unit through the throttling component and the high pressure stop valve.
In addition, in order to achieve the above object, the present invention further provides a control method of a multi-connected air conditioner, which is applied to the above multi-connected air conditioning system, and the method includes:
when the multi-connected air-conditioning system is in a refrigerating or heating mode, acquiring an energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air-conditioning system;
acquiring the working state of the main four-way valve;
and adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve so as to realize switching of the heat exchange modes of the outdoor heat exchanger.
Optionally, the step of adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve to switch the heat exchange modes of the outdoor heat exchanger includes:
when the working state of the main four-way valve is a power-on state, judging that the current multi-connected air-conditioning system is in a heating mode;
judging whether the required load ratio is greater than or equal to a first preset load ratio or not;
when the energy demand load ratio is greater than or equal to a first preset load ratio, the working state of the auxiliary four-way valve is adjusted to be a power-off state, so that the heat exchange mode of the outdoor heat exchanger is switched to heating countercurrent heat exchange; alternatively, the first and second electrodes may be,
and when the energy demand load ratio is smaller than a first preset load ratio, adjusting the working state of the auxiliary four-way valve to be in a power-on state so as to realize switching of the heat exchange mode of the outdoor heat exchanger to heating downstream heat exchange.
Optionally, the step of adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve to switch the heat exchange modes of the outdoor heat exchanger includes:
when the working state of the main four-way valve is a power-off state, judging that the current multi-connected air conditioning system is in a refrigeration mode;
judging whether the required load ratio is greater than or equal to a second preset load ratio or not;
when the energy demand load ratio is greater than or equal to a second preset load ratio, the working state of the auxiliary four-way valve is adjusted to be a power-on state, so that the heat exchange mode of the outdoor heat exchanger is switched to refrigeration countercurrent heat exchange; alternatively, the first and second electrodes may be,
and when the energy demand load ratio is smaller than a second preset load ratio, adjusting the working state of the auxiliary four-way valve to be a power-off state so as to realize switching of the heat exchange mode of the outdoor heat exchanger to refrigeration downstream heat exchange.
Optionally, the step of adjusting the working state of the auxiliary four-way valve to a power-off state includes:
controlling a first port of the auxiliary four-way valve to be communicated with a second port of the auxiliary four-way valve;
and controlling the third port of the auxiliary four-way valve to be communicated with the fourth port of the auxiliary four-way valve so as to adjust the working state of the auxiliary four-way valve to be a power-off state.
Optionally, the step of adjusting the working state of the auxiliary four-way valve to an energized state includes:
controlling a first port of the auxiliary four-way valve to be communicated with a fourth port of the auxiliary four-way valve;
and controlling the second port of the auxiliary four-way valve to be communicated with the third port of the auxiliary four-way valve so as to adjust the working state of the auxiliary four-way valve to be a power-on state.
Optionally, the step of obtaining an energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air conditioning system includes:
acquiring target loads corresponding to indoor units in the multi-connected air-conditioning system, and acquiring the sum of the indoor unit loads of the current multi-connected air-conditioning system according to the target loads corresponding to the indoor units;
acquiring the rated load of an outdoor unit of the multi-connected air conditioning system;
and acquiring the energy-demand load ratio between the indoor units and the outdoor units of the multi-connected air-conditioning system according to the sum of the loads of the indoor units and the rated load of the outdoor unit.
In addition, to achieve the above object, the present invention also provides a multiple air conditioner control device, including:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air-conditioning system when the multi-connected air-conditioning system is in a refrigerating or heating mode;
the second acquisition module is used for acquiring the working state of the main four-way valve;
and the adjusting module is used for adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve so as to realize switching of the heat exchange modes of the outdoor heat exchanger.
In addition, to achieve the above object, the present invention also provides a computer storage medium having a multi-connected air conditioner control program stored thereon, which, when executed by a processor, implements the steps of the multi-connected air conditioner control method as described above.
Compared with the prior art, the invention provides a control method of a multi-connected air conditioner, wherein the method is applied to a multi-connected air conditioner system, a first port of an auxiliary four-way valve of the multi-connected air conditioner system is connected with an inlet pipe of an outdoor heat exchanger, and a third port of the auxiliary four-way valve is connected with an outlet pipe of the outdoor heat exchanger; acquiring the working state of a main four-way valve; the working state of the auxiliary four-way valve is adjusted according to the energy demand ratio and the working state of the main four-way valve so as to realize the switching of the heat exchange modes of the outdoor heat exchanger.
Drawings
FIG. 1 is a schematic structural diagram of a multi-connected air conditioning system according to the present invention
FIG. 2 is a schematic flow chart of a control method for a multi-connected air conditioner according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart of a control method for a multi-connected air conditioner according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of functional modules of a multi-connected air conditioner control device according to an embodiment of the present invention.
Description of the drawings:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
8 | Inlet of heat exchangerMouth |
| 2 | |
9 | Temperature sensing bag at outlet of heat exchanger |
| 3 | Main four- |
10 | High-voltage sensor |
| 4 | |
11 | High-pressure stop valve |
| 5 | |
12 | Oil return capillary tube |
| 6 | Gas- |
13 | |
| 7 | Auxiliary four- |
14 | Low-pressure stop valve |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a multi-connected air conditioning system, which is characterized in that in the existing air conditioning system, the design of an outdoor heat exchanger usually adopts a heat exchange mode of heating countercurrent (namely, a refrigerant flows in from an outlet pipe orifice of the outdoor heat exchanger and flows out from an inlet pipe orifice of the outdoor heat exchanger) and refrigerating cocurrent (namely, the refrigerant flows in from an inlet pipe orifice of the outdoor heat exchanger and flows out from an outlet pipe orifice of the outdoor heat exchanger), but due to the internal structure of the existing air conditioning system, the outdoor heat exchanger can not freely switch cocurrent countercurrent heat exchange, and the technicians in the field know that the countercurrent heat exchange temperature difference is large, the heat exchange efficiency is high, the cocurrent heat exchange temperature difference is small, the heat exchange efficiency is low, the higher the environmental temperature is, the higher the refrigeration requirement on an air conditioner is, the lower the cocurrent heat exchange efficiency is low, and the larger the capacity of a single unit module is, the lower the heat exchange efficiency, therefore, the present embodiment provides a multi-connected air conditioning system for the above problem, and referring to fig. 1, in the present embodiment, the multi-connected air conditioning system includes an outdoor heat exchanger 4, a main four-way valve 3, an auxiliary four-way valve 7, and an indoor unit 13, wherein a first port C of the auxiliary four-way valve 7 is connected to an inlet pipe of the outdoor heat exchanger 4, a second port D of the auxiliary four-way valve 7 is connected to the main four-way valve 3, a third port E of the auxiliary four-way valve 7 is connected to an outlet pipe of the outdoor heat exchanger 4, and a fourth port S of the auxiliary four-way valve 7 is connected.
It should be noted that, in this embodiment, by providing an auxiliary four-way valve 2 in the multi-split air conditioning system, the refrigerant flow path of the outdoor heat exchanger 4 in the multi-split air conditioning system is converted from a single flow path to multiple flow paths, and then the purpose of freely switching the downstream and upstream heat exchange of the outdoor heat exchanger 7 is achieved, it should be understood that the outlet of the outdoor heat exchanger in the existing multi-split air conditioning system is directly connected to the throttling component, and the inlet of the outdoor heat exchanger is directly connected to the four-way valve, so that the refrigerant can only flow from the throttling component to the outlet of the outdoor heat exchanger, flow from the inlet of the outdoor heat exchanger to the four-way valve, or flow from the four-way valve to the inlet of the outdoor heat exchanger, and flow from the outlet of the outdoor heat exchanger to the throttling component, thereby the heat exchange manner of the outdoor heat exchanger is only heating downstream and cooling, while in this embodiment, by providing an auxiliary, therefore, when the refrigerant flows out from the throttling component 5, the refrigerant can flow to the pipe inlet or the pipe outlet of the outdoor heat exchanger 4 through the auxiliary four-way valve 2, or when the refrigerant flows out from the main four-way valve 3, the refrigerant can flow to the pipe inlet or the pipe outlet of the outdoor heat exchanger 4 through the auxiliary four-way valve 7, and the effect of free switching of downstream and upstream heat exchange of the outdoor heat exchanger 7 is achieved.
When the multi-connected air conditioning system performs cooling or heating, referring to fig. 1, the multi-connected air conditioning system further includes a low pressure stop valve 14, a throttling component 6, and a high pressure stop valve 11, a first port E of the main four-way valve 3 is connected to an indoor unit 13 through the low pressure stop valve 14, a second port D of the auxiliary four-way valve 7 is connected to a second port C of the main four-way valve 3, a fourth port S of the auxiliary four-way valve 4 is connected to the indoor unit 13 through the throttling component 5 and the high pressure stop valve 11, further, a third port D of the main four-way valve 3 is connected to an outlet pipe of the oil separator 2 through a high pressure sensor 10, and the fourth port S of the main four-way valve 3 is connected.
It should be further described that, in this embodiment, when the main four-way valve 3 is in the power-off state, the third port D and the second port C of the main four-way valve are connected, and the first port E and the fourth port S of the main four-way valve are connected, so that when the main four-way valve 3 is in the power-off state, the multi-connected air conditioning system is in the cooling mode, wherein the cooling mode refrigerant flows to: in addition, in the present embodiment, when the main four-way valve 3 is in the energized state, the third port D and the first port E of the main four-way valve are communicated, and the second port C and the fourth port S of the main four-way valve are communicated, so that when the main four-way valve 3 is in the energized state, the multi-type air conditioning system is in the heating mode, in which the cooling mode refrigerant flows: the compressor 1 → the oil separator 2 → the main four-way valve 3 is energized → the low pressure stop valve 14 → the indoor unit 13 → the high pressure stop valve 11 → the throttle member 5 → the auxiliary four-way valve 7 is controlled → the outdoor heat exchanger 4 → the auxiliary four-way valve 7 is controlled → the main four-way valve 3 is energized → the gas-liquid separator 6 → the compressor 1, thereby completing the system heating cycle process.
It should be further noted that, in this embodiment, the control of the auxiliary four-way valve 7 refers to a control mechanism of a conducting state of four ports of the auxiliary four-way valve 7, wherein, in this embodiment, when the auxiliary four-way valve 7 is in a power-off state, the first port C and the second port D of the auxiliary four-way valve are conducted, and the third port E and the fourth port S of the auxiliary four-way valve are conducted, so that when the auxiliary four-way valve 7 is in a power-on state, a flow direction of the refrigerant flowing through the outdoor heat exchanger 4 is the main four-way valve second port C → the auxiliary four-way valve second port D → the auxiliary four-way valve first port C → the inlet pipe port of the outdoor heat exchanger 4 → the outlet pipe port of the outdoor heat exchanger 4 → the auxiliary four-way valve third port E → the auxiliary four-way valve fourth port S → the throttling member 5, or the throttling member 5 → the auxiliary four-way valve third port E → the outlet pipe port E of the outdoor heat exchanger 4 → the inlet pipe port of the outdoor The second port D of the auxiliary four-way valve → the second port C of the main four-way valve, and further, when the auxiliary four-way valve 7 is in the energized state, conduction is established between the third port E and the second port D of the auxiliary four-way valve, and conduction is established between the first port C and the fourth port S of the auxiliary four-way valve, whereby when the auxiliary four-way valve 7 is in the energized state, the flow direction of the refrigerant flowing through the outdoor heat exchanger 4 is the second port C of the main four-way valve → the second port D of the auxiliary four-way valve → the third port E of the auxiliary four-way valve → the outlet pipe port of the outdoor heat exchanger 4 → the inlet pipe port of the outdoor heat exchanger 4 → the first port C of the auxiliary four-way valve → the fourth port S of the auxiliary four-way valve → the throttle member 5, or the throttle member 5 → the fourth port S of the auxiliary four-way valve → the first port C of the auxiliary four-way valve → the inlet pipe, and further, the downstream and upstream heat exchange of the outdoor heat exchanger 7 can be freely switched when the multi-connected air conditioning system performs refrigeration or heating based on a control mechanism of the conduction state of the four ports of the auxiliary four-way valve 7.
Based on the multi-connected air conditioning system shown in fig. 1, a first embodiment of the invention provides a control method for a multi-connected air conditioner.
Referring to fig. 2, fig. 2 is a flowchart illustrating a control method of a multi-split air conditioner according to a first embodiment of the present invention.
While a logical sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in a different sequence than that shown or described herein. Specifically, the control method of the multi-connected air conditioner in the embodiment includes:
step S10: when the multi-connected air-conditioning system is in a refrigerating or heating mode, acquiring an energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air-conditioning system;
in this embodiment, since at least one indoor unit of the multi-type air conditioning system is provided, the load of each indoor unit and the rated load of the outdoor unit in the multi-type air conditioning system are obtained in this embodiment, so as to obtain the energy/demand load ratio between the indoor unit and the outdoor unit of the multi-type air conditioning system.
Specifically, in this embodiment, the step of obtaining the energy demand load ratio between the indoor unit and the outdoor unit of the multi-connected air conditioning system specifically includes:
acquiring target loads corresponding to indoor units in the multi-connected air-conditioning system, and acquiring the sum of the indoor unit loads of the current multi-connected air-conditioning system according to the target loads corresponding to the indoor units;
acquiring the rated load of an outdoor unit of the multi-connected air conditioning system;
and acquiring the energy-demand load ratio between the indoor units and the outdoor units of the multi-connected air-conditioning system according to the sum of the loads of the indoor units and the rated load of the outdoor unit.
In this embodiment, in order to improve the accuracy of the multi-split air conditioner control, the target load refers to an indoor unit load after the indoor unit has undergone energy correction.
Step S20: acquiring the working state of the main four-way valve;
step S30: and adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve so as to realize switching of the heat exchange modes of the outdoor heat exchanger.
It should be understood that, referring to fig. 1, when the main four-way valve 3 is in the power-off state, conduction is made between the third port D and the second port C of the main four-way valve, conduction is made between the first port E and the fourth port S of the main four-way valve, and the refrigerant flows in the direction of the compressor → the oil separator → power-off of the main four-way valve → control of the auxiliary four-way valve → the outdoor heat exchanger → control of the auxiliary four-way valve → the throttle member → the high pressure stop valve → the indoor unit → the low pressure stop valve → power-off of the main four-way valve → the gas-liquid separator → the compressor, that is, the system is a refrigeration cycle process, and when the main four-way valve is in the power-on state, conduction is made between the third port D and the first port E of the main four-way valve, conduction is made between the second port C and the fourth port S of the main four-way valve, and the refrigerant flows in the direction of the direction Separator → compressor, i.e. the system is a heating cycle process.
Therefore, in this embodiment, the operating mode of the multi-connected air conditioning system is determined by obtaining the operating state of the main four-way valve, and further, the heat exchange mode of the outdoor unit in the operating mode of the current multi-connected air conditioning system is determined by the energy demand load ratio, it should be noted that the heat exchange coefficient is high when the outdoor unit heat exchanger enters the countercurrent heat exchange, and the heat exchange efficiency is reduced when the outdoor unit heat exchanger enters the cocurrent heat exchange, so that the regulation and control of the heat exchange amount in the operating mode of the current multi-connected air conditioning system are determined according to the energy demand load ratio, and further, it should be noted that, referring to fig. 1, in this embodiment, by arranging an auxiliary four-way valve 2 in the multi-connected air conditioning system, the refrigerant flow path of the outdoor heat exchanger 4 in the multi-connected air conditioning system is converted from a single flow path to multiple flow paths, and further, the first port C and the second port D of the auxiliary four-way valve are communicated with each other, and the third port E and the fourth port S of the auxiliary four-way valve are communicated with each other, so that when the auxiliary four-way valve is in an energized state, the flow direction of the refrigerant flowing through the outdoor heat exchanger is the second port C of the main four-way valve → the second port D of the auxiliary four-way valve → the first port C of the auxiliary four-way valve → the pipe inlet of the outdoor heat exchanger → the pipe outlet of the outdoor heat exchanger → the third port E of the auxiliary four-way valve → the fourth port S of the auxiliary four-way valve → the throttling part, or from the throttling part → the fourth port S of the auxiliary four-way valve → the third port E of the auxiliary four-way valve → the pipe outlet of the outdoor heat exchanger → the pipe inlet of the outdoor heat exchanger → the first port C of the auxiliary four-.
Therefore, in this embodiment, after the control of the heat exchange amount in the operation mode of the current multi-connected air conditioning system is determined according to the energy demand load ratio, the switching of the heat exchange modes of the outdoor heat exchanger is realized by adjusting the working state of the auxiliary four-way valve, for example, when the operation mode of the multi-connected air conditioning system is the heating mode, the load demand of the indoor unit is large (that is, the energy demand load ratio between the indoor unit and the outdoor unit of the multi-connected air conditioning system is large), which indicates that the output of the outdoor unit is insufficient, the refrigerant of the multi-connected air conditioning system is easy to condense in the indoor heat exchanger, the overcooling compressor is easy to compress liquid or wet, and the compressor is damaged, so that the auxiliary four-way valve is controlled to be in the power-off state, the first port C and the second port D of the auxiliary four-way valve are conducted, and the third port, the heat exchange coefficient is higher, and the heat exchange of outdoor heat exchanger is strengthened for the refrigerant is overheated at the moderate degree condensation of indoor side heat exchanger, has avoided compressor liquid compression or wet compression, and then has improved travelling comfort and press reliability.
In addition, in an embodiment, after the working state of the auxiliary four-way valve is adjusted according to the energy demand load ratio and the working state of the main four-way valve to realize the switching of the heat exchange modes of the outdoor heat exchanger, in order to maintain the comfort and the reliability of the compressor of the multi-connected air conditioning system, in the embodiment, after the stable operation of the outdoor heat exchanger is monitored, the step of obtaining the energy demand load ratio between the indoor unit and the outdoor unit of the multi-connected air conditioning system when the multi-connected air conditioning system is in a cooling or heating mode, obtaining the working state of the main four-way valve, adjusting the working state of the auxiliary four-way valve according to the energy demand load ratio and the working state of the main four-way valve to realize the switching of the heat exchange modes of the outdoor heat exchanger is returned to be executed until the multi-connected air conditioning system is in a shutdown or standby state, wherein it should be noted that in the embodiment, the stability of, namely, when the temperature value acquired by the heat exchanger inlet temperature sensing bag and/or the heat exchanger outlet temperature sensing bag is not fluctuated or the fluctuation amplitude is in a preset amplitude, the outdoor heat exchanger is judged to be stably operated, and therefore the comfort of the multi-connected air conditioning system is improved.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and those skilled in the art can make settings based on needs in practical applications, and the settings are not listed here.
In this embodiment, when the multi-connected air conditioning system is in the cooling or heating mode, the energy-demand load ratio between the indoor unit and the outdoor unit of the multi-connected air conditioning system is obtained; acquiring the working state of a main four-way valve; the working state of the auxiliary four-way valve is adjusted according to the energy demand ratio and the working state of the main four-way valve so as to realize the switching of the heat exchange modes of the outdoor heat exchanger.
Further, based on the first embodiment of the control method of the multiple air conditioner, a second embodiment of the control method of the multiple air conditioner is provided.
Referring to fig. 3, fig. 3 is a schematic flow chart of a control method of a multi-connected air conditioner according to a second embodiment of the present invention;
the difference between the second embodiment of the multi-connected air conditioner control method and the first embodiment of the multi-connected air conditioner control method is that the step of adjusting the working state of the auxiliary four-way valve according to the energy-to-demand load ratio and the working state of the main four-way valve to realize the switching of the heat exchange modes of the outdoor heat exchanger comprises the following steps:
step S3010: when the working state of the main four-way valve is a power-on state, judging that the current multi-connected air-conditioning system is in a heating mode;
step S3011: judging whether the required load ratio is greater than or equal to a first preset load ratio or not;
step S3012: when the energy demand load ratio is greater than or equal to a first preset load ratio, the working state of the auxiliary four-way valve is adjusted to be a power-off state, so that the heat exchange mode of the outdoor heat exchanger is switched to heating countercurrent heat exchange; alternatively, the first and second electrodes may be,
step S3013: and when the energy demand load ratio is smaller than a first preset load ratio, adjusting the working state of the auxiliary four-way valve to be in a power-on state so as to realize switching of the heat exchange mode of the outdoor heat exchanger to heating downstream heat exchange.
It should be understood that, based on the above-mentioned structure of the multi-connected air conditioning system, when the working state of the main four-way valve is the power-on state, the current multi-connected air conditioning system is in the heating mode, at this time, it is determined whether the required load ratio is greater than or equal to a first preset load ratio, wherein the first preset load ratio is between 40% and 70%, it should be noted that, when the required load ratio is greater than or equal to the first preset load ratio, it indicates that the multi-connected air conditioning system is in heating high-load operation, because the indoor unit has a large load demand and the outdoor unit has insufficient output, the experience effect inside the multi-connected air conditioning system is general, and further the refrigerant is easy to condense and supercool in the indoor heat exchanger, the compressor is easy to compress liquid or wet, the compressor is damaged, therefore the outdoor unit heat exchanger needs to be controlled to enter the countercurrent heat exchange, thereby through the intensive heat transfer of off-premises station heat exchanger, make the inboard experience effect of multiple air conditioning system promote, make the refrigerant overheated at indoor side heat exchanger moderate degree condensation, avoided compressor liquid compression or wet compression, and then improved travelling comfort and press reliability, consequently when can need the load ratio more than or equal to first predetermined load ratio, the operating condition adjustment that needs to assist the cross valve is the outage state, switch into the heat production countercurrent flow heat transfer with outdoor heat exchanger's heat transfer mode in order to realize, and then reach above-mentioned effect.
In addition, in another embodiment, when the energy demand load ratio is smaller than a first preset load ratio, which indicates that the multi-connected air conditioning system is in heating low-load operation, because the indoor unit has a small load demand and the outdoor unit has a large output, the experience effect on the inner side of the multi-connected air conditioning system is good, and further, the refrigerant is easily condensed and overheated in the indoor side heat exchanger, and the compressor is easily operated beyond the range, so that the compressor is damaged. Therefore, the outdoor heat exchanger needs to be controlled to enter the downstream heat exchange, the heat exchange coefficient of the downstream heat exchange is low, the effect of experience on the inner side of the multi-connected air conditioning system is reduced through the weakened heat exchange of the outdoor heat exchanger, the effect of experience on the inner side of the multi-connected air conditioning system is reduced, the condensation superheat degree of a refrigerant on the indoor heat exchanger is reduced, the compressor runs in a safe range, the reliability of the compressor is improved, the working state of the auxiliary four-way valve needs to be adjusted to be in a power-off state when the energy load ratio is smaller than a first preset load ratio, the heat exchange mode of the outdoor heat exchanger is switched to heating countercurrent heat exchange, and the effects are achieved.
In addition, the step of adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve to realize the switching of the heat exchange modes of the outdoor heat exchanger further comprises:
step S3020: when the working state of the main four-way valve is a power-off state, judging that the current multi-connected air conditioning system is in a refrigeration mode;
step S3021: judging whether the required load ratio is greater than or equal to a second preset load ratio or not;
step S3022: when the energy demand load ratio is greater than or equal to a second preset load ratio, the working state of the auxiliary four-way valve is adjusted to be a power-on state, so that the heat exchange mode of the outdoor heat exchanger is switched to refrigeration countercurrent heat exchange; alternatively, the first and second electrodes may be,
step S3023: and when the energy demand load ratio is smaller than a second preset load ratio, adjusting the working state of the auxiliary four-way valve to be a power-off state so as to realize switching of the heat exchange mode of the outdoor heat exchanger to refrigeration downstream heat exchange.
It should be understood that, based on the structure of the multi-connected air conditioning system, when the working state of the main four-way valve is the power-off state, the current multi-connected air conditioning system is in the cooling mode, at this time, it is determined whether the energy demand load ratio is greater than or equal to a second preset load ratio, where the second preset load ratio is between 20% and 60%, it should be noted that, when the energy demand load ratio is greater than or equal to the second preset load ratio, it indicates that the multi-connected air conditioning system is in cooling high-load operation, because the indoor unit has a large load demand and the outdoor unit has an insufficient output, the experience effect on the inner side of the multi-connected air conditioning system is general, and further, the refrigerant is excessively evaporated in the indoor heat exchanger, the return air of the compressor is excessively hot, the compressor is easily. Therefore, the outdoor heat exchanger needs to be controlled to enter countercurrent heat exchange, the heat exchange coefficient of the countercurrent heat exchange is higher, the enhanced heat exchange through the outdoor heat exchanger improves the effect of the inside experience of the multi-connected air conditioning system, the evaporation overheat of a refrigerant in the indoor heat exchanger is reduced, the liquid compression or wet compression of a compressor is avoided, the comfort and the reliability of a press are improved, the working state of the auxiliary four-way valve needs to be adjusted to be an electrified state when the load ratio is required to be greater than or equal to the second preset load ratio, the heat exchange mode of the outdoor heat exchanger is switched to refrigeration countercurrent heat exchange, and the effect is achieved.
In addition, in another embodiment, when the energy demand load ratio is smaller than a first preset load ratio, which indicates that the multi-connected air conditioning system is in a small refrigeration load operation, because the indoor unit load demand is small and the outdoor unit output is large, the experience effect of the inner side of the multi-connected air conditioning system is good, the refrigerant is easy to be incompletely evaporated in the indoor side heat exchanger, the compressor is easy to be subjected to liquid compression or wet compression, and the compressor is damaged, so that the outdoor unit heat exchanger needs to be controlled to enter downstream heat exchange, because the heat exchange coefficient of the downstream heat exchange is higher, the experience effect of the inner side of the multi-connected air conditioning system is improved through the enhanced heat exchange of the outdoor unit heat exchanger, the refrigerant is easy to be completely evaporated in the indoor side heat exchanger, the liquid compression or wet compression of the compressor is avoided, the comfort and the reliability of the compressor are improved, and, the working state of the auxiliary four-way valve needs to be adjusted to be in a power-off state so as to switch the heat exchange mode of the outdoor heat exchanger to refrigeration countercurrent heat exchange, and further achieve the effect.
It should be further noted that, in this embodiment, the step of adjusting the working state of the auxiliary four-way valve to the power-off state includes:
controlling a first port of the auxiliary four-way valve to be communicated with a second port of the auxiliary four-way valve;
and controlling the third port of the auxiliary four-way valve to be communicated with the fourth port of the auxiliary four-way valve so as to adjust the working state of the auxiliary four-way valve to be a power-off state.
In this step, referring to FIG. 1, when the auxiliary four-way valve is in a power-off state, the first port C and the second port D of the auxiliary four-way valve are connected, the third port E and the fourth port S of the auxiliary four-way valve are connected, thus, when the auxiliary four-way valve is in an energized state, the refrigerant flows through the second port C of the main four-way valve → the second port D of the auxiliary four-way valve → the first port C of the auxiliary four-way valve → the inlet pipe port of the outdoor heat exchanger 4 → the outlet pipe port of the outdoor heat exchanger 4 → the third port E of the auxiliary four-way valve → the fourth port S of the auxiliary four-way valve → the throttle member 5, or the throttling component 5 → the fourth port S of the auxiliary four-way valve → the third port E of the auxiliary four-way valve → the outlet pipe orifice of the outdoor heat exchanger 4 → the pipe inlet of the outdoor heat exchanger 4 → the first port C of the auxiliary four-way valve → the second port D of the auxiliary four-way valve → the second port C of the main four-way valve, thereby realizing the forward-reverse flow heat exchange of the outdoor heat exchanger.
It should be further noted that, in this embodiment, the step of adjusting the working state of the auxiliary four-way valve to the power-on state further includes:
controlling a first port of the auxiliary four-way valve to be communicated with a fourth port of the auxiliary four-way valve;
and controlling the second port of the auxiliary four-way valve to be communicated with the third port of the auxiliary four-way valve so as to adjust the working state of the auxiliary four-way valve to be a power-on state.
In this step, referring to fig. 2, when the auxiliary four-way valve 7 is in the energized state, the third port E and the second port D of the auxiliary four-way valve are connected, and the first port C and the fourth port S of the auxiliary four-way valve are connected, so that when the auxiliary four-way valve 7 is in the energized state, the flow direction of the refrigerant flowing through the outdoor heat exchanger 4 is the main four-way valve second port C → the auxiliary four-way valve second port D → the auxiliary four-way valve third port E → the outlet pipe port of the outdoor heat exchanger 4 → the inlet pipe port of the outdoor heat exchanger 4 → the auxiliary four-way valve first port C → the auxiliary four-way valve fourth port S → the throttle member 5, or the throttle member 5 → the auxiliary four-way valve fourth port S → the auxiliary four-way valve first port C → the inlet pipe port of the outdoor heat exchanger 4 → the outlet pipe port of the outdoor heat exchanger 4 → the auxiliary four-way valve third, thereby realizing the forward and reverse flow heat exchange of the outdoor heat exchanger.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and those skilled in the art can make settings based on needs in practical applications, and the settings are not listed here.
In the embodiment, the working state of the auxiliary four-way valve can be adjusted for the running mode by the multi-connected air conditioning system with the required load ratio, so that the hydraulic compression or wet compression of the compressor is avoided, and the comfort and the reliability of the compressor are further improved.
In addition, the embodiment also provides a multi-connected air conditioner control device. Referring to fig. 4, fig. 4 is a functional block diagram of a multi-connected air conditioner control device according to an embodiment of the present invention.
In this embodiment, the multiple air conditioner control device is a virtual device to realize all functions of the multiple air conditioner control program: the system comprises a multi-connected air conditioning system, a control unit and a control unit, wherein the multi-connected air conditioning system is used for acquiring the energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air conditioning system when the multi-connected air conditioning system is in a refrigerating or heating mode; the system comprises a main four-way valve, a control module and a control module, wherein the main four-way valve is used for acquiring the working state of the main four-way valve; and the auxiliary four-way valve is used for adjusting the working state of the auxiliary four-way valve according to the energy demand load ratio and the working state of the main four-way valve so as to realize the switching of the heat exchange modes of the outdoor heat exchanger.
Specifically, referring to fig. 4, the multi-connected air conditioning control apparatus includes:
the system comprises a first acquisition module 10, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air-conditioning system when the multi-connected air-conditioning system is in a cooling or heating mode;
a second obtaining module 20, configured to obtain a working state of the main four-way valve;
and the adjusting module 30 is configured to adjust the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve, so as to switch the heat exchange modes of the outdoor heat exchanger.
The control device for the multi-connected air conditioner provided by the embodiment obtains the energy demand load ratio between the indoor unit and the outdoor unit of the multi-connected air conditioning system when the multi-connected air conditioning system is in a cooling or heating mode; acquiring the working state of a main four-way valve; the working state of the auxiliary four-way valve is adjusted according to the energy demand ratio and the working state of the main four-way valve so as to realize the switching of the heat exchange modes of the outdoor heat exchanger.
In addition, an embodiment of the present invention further provides a computer storage medium, where a multi-connected air conditioner control program is stored on the computer storage medium, and when the multi-connected air conditioner control program is executed by a processor, the steps of the multi-connected air conditioner control method are implemented, which are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures or flow transformations made by the present specification and drawings, or applied directly or indirectly to other related arts, are included in the scope of the present invention.
Claims (10)
1. The multi-connected air conditioning system is characterized by comprising an outdoor heat exchanger, a main four-way valve, an auxiliary four-way valve and an indoor unit, wherein a first port of the auxiliary four-way valve is connected with an inlet pipe of the outdoor heat exchanger, a second port of the auxiliary four-way valve is connected with the main four-way valve, a third port of the auxiliary four-way valve is connected with an outlet pipe of the outdoor heat exchanger, and a fourth port of the auxiliary four-way valve is connected to a pipeline between the main four-way valve and the indoor unit.
2. The multi-connected air conditioning system according to claim 1, further comprising a low pressure cut-off valve, a throttling part, and a high pressure cut-off valve, wherein a first port of the main four-way valve is connected to the indoor unit through the low pressure cut-off valve, a second port of the auxiliary four-way valve is connected to a second port of the main four-way valve, and a fourth port of the auxiliary four-way valve is connected to the indoor unit through the throttling part and the high pressure cut-off valve.
3. A multi-connected air conditioner control method applied to the multi-connected air conditioner system of claim 1, the method comprising:
when the multi-connected air-conditioning system is in a refrigerating or heating mode, acquiring an energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air-conditioning system;
acquiring the working state of the main four-way valve;
and adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve so as to realize switching of the heat exchange modes of the outdoor heat exchanger.
4. The method for controlling a multi-connected air conditioner according to claim 3, wherein the step of adjusting the operating state of the auxiliary four-way valve according to the energy-to-demand load ratio and the operating state of the main four-way valve to switch the heat exchange modes of the outdoor heat exchangers comprises:
when the working state of the main four-way valve is a power-on state, judging that the current multi-connected air-conditioning system is in a heating mode;
judging whether the required load ratio is greater than or equal to a first preset load ratio or not;
when the energy demand load ratio is greater than or equal to a first preset load ratio, the working state of the auxiliary four-way valve is adjusted to be a power-off state, so that the heat exchange mode of the outdoor heat exchanger is switched to heating countercurrent heat exchange; alternatively, the first and second electrodes may be,
and when the energy demand load ratio is smaller than a first preset load ratio, adjusting the working state of the auxiliary four-way valve to be in a power-on state so as to realize switching of the heat exchange mode of the outdoor heat exchanger to heating downstream heat exchange.
5. The method for controlling a multi-connected air conditioner according to claim 3, wherein the step of adjusting the operating state of the auxiliary four-way valve according to the energy-to-demand load ratio and the operating state of the main four-way valve to switch the heat exchange modes of the outdoor heat exchangers comprises:
when the working state of the main four-way valve is a power-off state, judging that the current multi-connected air conditioning system is in a refrigeration mode;
judging whether the required load ratio is greater than or equal to a second preset load ratio or not;
when the energy demand load ratio is greater than or equal to a second preset load ratio, the working state of the auxiliary four-way valve is adjusted to be a power-on state, so that the heat exchange mode of the outdoor heat exchanger is switched to refrigeration countercurrent heat exchange; alternatively, the first and second electrodes may be,
and when the energy demand load ratio is smaller than a second preset load ratio, adjusting the working state of the auxiliary four-way valve to be a power-off state so as to realize switching of the heat exchange mode of the outdoor heat exchanger to refrigeration downstream heat exchange.
6. The multi-connected air conditioner control method according to claim 4 or 5, wherein the step of adjusting the operating state of the auxiliary four-way valve to the power-off state comprises:
controlling a first port of the auxiliary four-way valve to be communicated with a second port of the auxiliary four-way valve;
and controlling the third port of the auxiliary four-way valve to be communicated with the fourth port of the auxiliary four-way valve so as to adjust the working state of the auxiliary four-way valve to be a power-off state.
7. The multi-connected air conditioner control method according to claim 4 or 5, wherein the step of adjusting the operating state of the auxiliary four-way valve to the power-on state comprises:
controlling a first port of the auxiliary four-way valve to be communicated with a fourth port of the auxiliary four-way valve;
and controlling the second port of the auxiliary four-way valve to be communicated with the third port of the auxiliary four-way valve so as to adjust the working state of the auxiliary four-way valve to be a power-on state.
8. The method of claim 3, wherein the step of obtaining the energy demand load ratio between the indoor units and the outdoor units of the multi-connected air conditioning system comprises:
acquiring target loads corresponding to indoor units in the multi-connected air-conditioning system, and acquiring the sum of the indoor unit loads of the current multi-connected air-conditioning system according to the target loads corresponding to the indoor units;
acquiring the rated load of an outdoor unit of the multi-connected air conditioning system;
and acquiring the energy-demand load ratio between the indoor units and the outdoor units of the multi-connected air-conditioning system according to the sum of the loads of the indoor units and the rated load of the outdoor unit.
9. A multi-connected air conditioner control device, characterized by comprising:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the energy-demand load ratio between an indoor unit and an outdoor unit of the multi-connected air-conditioning system when the multi-connected air-conditioning system is in a refrigerating or heating mode;
the second acquisition module is used for acquiring the working state of the main four-way valve;
and the adjusting module is used for adjusting the working state of the auxiliary four-way valve according to the energy-demand load ratio and the working state of the main four-way valve so as to realize switching of the heat exchange modes of the outdoor heat exchanger.
10. A computer storage medium having stored thereon a multi-connected air conditioning control program that, when executed by a processor, performs the steps of the multi-connected air conditioning control method according to any one of claims 3 to 9.
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