CN108644983A - Multi-online air-conditioning system and its control method, control device - Google Patents
Multi-online air-conditioning system and its control method, control device Download PDFInfo
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- CN108644983A CN108644983A CN201810467326.3A CN201810467326A CN108644983A CN 108644983 A CN108644983 A CN 108644983A CN 201810467326 A CN201810467326 A CN 201810467326A CN 108644983 A CN108644983 A CN 108644983A
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- conditioning system
- online air
- electric expansion
- expansion valve
- valve
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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
- F24F11/70—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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of multi-online air-conditioning systems, including refrigerant circulation circuit, which includes indoor heat-exchange unit, four-way valve, outdoor heat exchanger and compressor made of piping connection, in addition, further include flow-rate adjustment branch, which includes：Electric expansion valve, electric expansion valve have a first end and a second end, and the first end of electric expansion valve is connected to the connecting line between outdoor heat exchanger and indoor heat-exchange unit；First solenoid valve, the input terminal of the first solenoid valve and the second end of electric expansion valve connect, and the output end of the first solenoid valve is connected to the connecting line between four-way valve and compressor return air mouth.The invention also discloses a kind of multi-online air-conditioning system control method and multi-online air-conditioning system control devices.The present invention reduces compressor operating load and system output power, avoid the long-distance cycle of unnecessary refrigerant and caused by crushing, so that cold medium flux is more effectively adapted to the different refrigeration demand of indoor unit.
Description
Technical field
The present invention relates to refrigeration technology field more particularly to multi-online air-conditioning system, multi-line system control method and
Multi-online air-conditioning system control device.
Background technology
In current multi-gang air-conditioner, outdoor unit connects more indoor units, and indoor unit can be separated according to refrigeration demand portion
It opens or is all turned on, the drop that this variation for just causing indoor unit to run causes outdoor unit to adjust is big.
Since the connecting pipe of multi-online air-conditioning system internal-external machine is apart from farther out, height fall is big, and refrigerant will pass through always
Long-distance operation, flow-rate adjustment will increase the operating load of compressor and the output power of system not in time, cause unnecessary refrigerant long
Crushing caused by way recycles and indoor unit comfort type flow-rate adjustment are difficult.
The above is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that the above is existing skill
Art.
Invention content
The main purpose of the present invention is to provide a kind of multi-online air-conditioning systems, it is intended to reduce compressor operating load, subtract
Mini system output power, avoid unnecessary refrigerant by indoor unit it is long-distance cycle and caused by crushing, enable cold medium flux more effectively
Adapt to the different refrigeration demand of indoor unit, keep system operation stability and reliability.
To achieve the above object, the present invention provides a kind of multi-online air-conditioning system, and the multi-online air-conditioning system includes cold
Matchmaker's circulation loop, the refrigerant circulation circuit include indoor heat-exchange unit, four-way valve, outdoor heat exchanger made of piping connection
And compressor, the interior heat-exchange unit include at least two indoor heat exchangers in parallel, the four-way valve have first port,
Second port, third port and the 4th port, the compressor have exhaust outlet and gas returning port, the first port and the row
Gas port connects, and the second port is connect with the gas returning port, and the third port is connect with one end of the outdoor heat exchanger,
The other end of the outdoor heat exchanger is connect with one end of the indoor heat-exchange unit, the 4th port and the indoor heat exchange
The other end of unit connects, and the multi-online air-conditioning system further includes flow-rate adjustment branch, and the flow-rate adjustment branch includes：
Electric expansion valve, the electric expansion valve have a first end and a second end, and the first end of the electric expansion valve connects
The connecting line being connected between the outdoor heat exchanger and the indoor heat-exchange unit；
The input terminal of first solenoid valve, first solenoid valve is connect with the second end of the electric expansion valve, and described
The output end of one solenoid valve is connected to the connecting line between the four-way valve and the compressor return air mouth.
Optionally, the flow-rate adjustment branch further includes：
The output end of second solenoid valve, the second solenoid valve is connected to first solenoid valve and the electric expansion valve
Between connecting line, the input terminal of the second solenoid valve is connected between the exhaust outlet of compressor and the four-way valve
Connecting line.
Optionally, the flow-rate adjustment branch further includes：
Capillary, the capillary are connected with the second solenoid valve, one end of the capillary and second electromagnetism
The input terminal of valve connects, and the other end of the capillary is connected to the connection between the exhaust outlet of compressor and the four-way valve
Pipeline.
Optionally, the multi-online air-conditioning system further include set on the outdoor heat exchanger and the indoor heat-exchange unit it
Between fluid reservoir, the fluid reservoir has first interface, second interface and third interface, and the first interface changes with the outdoor
Hot device connection, the second interface are connect with the indoor heat exchanger, the third interface and the first of the electric expansion valve
End connection.
In addition, to achieve the above object, the present invention also provides a kind of multi-online air-conditioning system control methods, based on above-mentioned
Multi-online air-conditioning system, when the multi-online air-conditioning system does not include second solenoid valve, the multi-online air-conditioning system control
Method includes the following steps：
In the multi-online air-conditioning system refrigerating operaton, obtain the total exhaust side of the multi-online air-conditioning system it is current the
One pressure value；
When the current first pressure value of total exhaust side is more than the first preset value, the first solenoid valve and electronics are opened
Expansion valve.
Optionally, when the multi-online air-conditioning system includes second solenoid valve, the multi-online air-conditioning system controlling party
Method includes the following steps：
In the multi-online air-conditioning system refrigerating operaton, obtain the total exhaust side of the multi-online air-conditioning system it is current the
One pressure value；
When the current first pressure value of total exhaust side is more than first preset value, second electromagnetism is closed
Valve opens first solenoid valve and the electric expansion valve.
Optionally, when the multi-online air-conditioning system includes the second solenoid valve, the multi-online air-conditioning system control
Method processed includes the following steps：
In the multi-online air-conditioning system heating operation, obtain the total exhaust side of the multi-online air-conditioning system it is current the
Two pressure values；
When the current second pressure value of total exhaust side is more than the second preset value, first solenoid valve is closed, is opened
Open the second solenoid valve and the electric expansion valve.
Optionally, the closing second solenoid valve, unlatching first solenoid valve and the electric expansion valve
Step or after described the step of closing first solenoid valve, opening the second solenoid valve and the electric expansion valve,
Further include：
Judge the numerical intervals where the current first pressure value of total exhaust side or current second pressure value；
The current aperture of the electric expansion valve is adjusted according to the numerical intervals of judgement.
Optionally, the numerical intervals according to judgement adjust the step of current aperture of the electric expansion valve and include：
When the numerical intervals of judgement for first pressure section when, control the electric expansion valve and keep current aperture operation；
When the numerical intervals of judgement for second pressure section when, control the electric expansion valve according to preset rules increase work as
Preceding aperture；
When the numerical intervals of judgement for third pressure range when, close the electric expansion valve；
Pressure value in the second pressure section>Pressure value in the first pressure section>The third pressure area
Between in pressure value.
Optionally, the multi-online air-conditioning system control method further includes：
In the multi-online air-conditioning system refrigerating operaton, obtain the third pressure value of the electric expansion valve second end with
And the 4th pressure value of total return-air side of the multi-online air-conditioning system；
Judge the first difference of the third pressure value and the 4th pressure value whether in the 4th pressure range；
If so, execute it is described when the numerical intervals of judgement for first pressure section when, control the electric expansion valve and protect
The step of holding the operation of current aperture and it is described when the numerical intervals of judgement for second pressure section when, it is swollen to control the electronics
The step of swollen valve increases current aperture according to preset rules；Or,
In the multi-online air-conditioning system heating operation, the 5th pressure value of the electric expansion valve first end is obtained；
Judge the second difference of the current second pressure value of total exhaust side and the 5th pressure value whether the 5th
Pressure range；
If so, execute it is described when the numerical intervals of judgement for first pressure section when, control the electric expansion valve and protect
The step of holding the operation of current aperture and it is described when the numerical intervals of judgement for second pressure section when, it is swollen to control the electronics
The step of swollen valve increases current aperture according to preset rules.
Optionally, it is also wrapped after the step of control electric expansion valve increases current aperture according to preset rules
It includes：
In the multi-online air-conditioning system refrigerating operaton, judge the current first pressure value of total exhaust side whether position
In the first pressure section, and/or, whether first difference is located at the 6th pressure range；
If it is not, it is out of service then to control compressor；Or,
In the multi-online air-conditioning system heating operation, judge the current second pressure value of total exhaust side whether position
In the first pressure section, and/or, whether second difference is located at the 7th pressure range；
If it is not, it is out of service then to control the compressor.
In addition, to achieve the above object, the present invention also provides a kind of multi-online air-conditioning system control device, the multi-connected machines
Air-conditioning system control device includes：It memory, processor and is stored on the memory and can run on the processor
Multi-gang air-conditioner control program, multi-gang air-conditioner control program realizes as above any one institute when being executed by the processor
The step of multi-online air-conditioning system control method stated.
The present invention is by being arranged flow-rate adjustment branch, and one end of flow-rate adjustment branch is connected to indoor heat exchanger and interior is changed
Connecting line between heat engine group, the other end is connected to the connecting line between four-way valve and compressor return air mouth, in multi-connected machine
When the first pressure value of air-conditioning system refrigerating operaton and exhaust side is more than the first preset value, turn-on flow rate adjusts the electronics in branch
Expansion valve and the first solenoid valve make the part refrigerant of participation refrigeration cycle flow back into compressor from flow-rate adjustment branch, to reduce
The coolant quantity of refrigeration cycle is participated in, compressor operating load is reduced, reduces system output power, avoids unnecessary refrigerant by indoor
Captain way cycle and caused by crushing, so that cold medium flux is more effectively adapted to the different refrigeration demand of indoor unit, keep system
Operation stability and reliability.
Description of the drawings
Fig. 1 is the structural schematic diagram of multi-online air-conditioning system in the embodiment of the present invention；
Fig. 2 is the first pass schematic diagram of multi-online air-conditioning system control method in the embodiment of the present invention；
Fig. 3 is the second procedure schematic diagram of multi-online air-conditioning system control method in the embodiment of the present invention；
Fig. 4 is the third flow diagram of multi-online air-conditioning system control method in the embodiment of the present invention；
Fig. 5 is the 4th flow diagram of multi-online air-conditioning system control method in the embodiment of the present invention.
| Title | Label | Title | Label |
| Indoor heat exchanger | 100 | Fluid reservoir | 600 |
| Second throttling device | 110 | Gas-liquid separator | 710 |
| Volume control device | 120 | Oil eliminator | 720 |
| Four-way valve | 200 | First throttling device | 810 |
| Outdoor heat exchanger | 300 | Check valve | 820 |
| Compressor | 400 | First pressure sensor | 910 |
| Electric expansion valve | 510 | Second pressure sensor | 920 |
| First solenoid valve | 520 | Third pressure sensor | 930 |
| Second solenoid valve | 530 | 4th pressure sensor | 940 |
| Capillary | 540 |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of multi-online air-conditioning system.
In embodiments of the present invention, as shown in Figure 1, multi-online air-conditioning system includes refrigerant circulation circuit, refrigerant circulation returns
Road includes indoor heat-exchange unit, four-way valve 200, outdoor heat exchanger 300, compressor 400 made of piping connection.Indoor heat exchange
Unit includes at least two indoor heat exchanger units in parallel.
Wherein, there is compressor 400 exhaust outlet and gas returning port, four-way valve 200 to have first port, second port, third
Port and the 4th port.The first port of four-way valve 200 is connect with the exhaust outlet of compressor 400, in first port and exhaust outlet
Between be equipped with oil eliminator 720, the lubricating oil in high steam that refrigeration compressor 400 is discharged is detached, to ensure to fill
It sets and safely and efficiently runs.The second port of four-way valve 200 is connect with the gas returning port of compressor 400, in second port and return-air
Gas-liquid separator 710 is equipped between mouthful, for isolating and preserving the liquid in muffler to prevent 400 liquid hammer of compressor.Four
One end of the third port connection outdoor heat exchanger 300 of port valve 200, the other end and the indoor heat exchanger machine of outdoor heat exchanger 300
One end connection after group is in parallel, check valve 820 is equipped between outdoor heat exchanger 300 and indoor heat exchanger unit, ensures system
The one-way flow of refrigerant when refrigerating operaton.In addition, the multi-online air-conditioning system, which is additionally provided with, is parallel to 820 both ends of above-mentioned check valve
First throttling device 810 is used to adjust the cold medium flux for entering outdoor heat exchanger 300 after long-distance transport when heating operation.
The other end after the 4th port connection indoor unit parallel connection of four-way valve 200.
Indoors in heat exchanger unit, one end that each indoor heat exchanger 100 is connect with outdoor heat exchanger 300 is in series with
Second throttling device 110, for adjusting the refrigerant stream for getting in heat exchanger 100 after long-distance transport in refrigerating operaton
Amount；One end that each indoor heat exchanger 100 is connect with the 4th interface of four-way valve 200 is in series with volume control device 120,
It is turned on and off according to demand when refrigeration or heating, to control the outflow of indoor heat exchanger 100 or flow into the cold of indoor heat exchanger 100
Matchmaker's flow.
When heat exchanger 100 sends out refrigerating operaton instruction indoors, corresponding second throttling device 110 adjusts open according to demand
Degree, corresponding volume control device 120 is in open state at this time；It is corresponding when indoor heat exchanger 100 sends out shutdown command
Second throttling device 110 is closed immediately, and corresponding volume control device 120 is conducive to interior and changes still in open state at this time
Refrigerant in hot device 100 constantly gasifies, and so that larger amount of refrigerant is returned to gas-liquid separator 710 by return-air and participates in multi-gang air-conditioner
The cycle operation of system.
When heat exchanger 100 sends out heating operation instruction indoors, corresponding second throttling device 110 adjusts open according to demand
Degree, corresponding volume control device 120 is in open state at this time；It is corresponding when indoor heat exchanger 100 sends out shutdown command
Volume control device 120 is closed immediately, and corresponding second throttling device 110 is conducive to interior and changes still in open state at this time
Under high pressure effect, larger amount of refrigerant returns to outdoor heat exchanger 300 and participates in multi-online air-conditioning system refrigerant in hot device 100
Cycle operation.
In setting based on above-mentioned multi-online air-conditioning system, as shown in Figure 1, the multi-online air-conditioning system further includes flow
Adjust branch.The specific flow-rate adjustment branch includes electric expansion valve 510 and the first solenoid valve 520, for adjusting the system of participation
The cold medium flux of SAPMAC method.Electric expansion valve 510 has a first end and a second end, and the first end of electric expansion valve 510 is connected to
Connecting line between the outdoor heat exchanger 300 and the indoor heat exchanger unit；The input terminal of first solenoid valve 520 and electricity
The second end of sub- expansion valve 510 connects, and the output end of the first solenoid valve 520 is connected to four-way valve 200 and 400 gas returning port of compressor
Between connecting line.
In multi-online air-conditioning system refrigerating operaton, and the first pressure value of the total exhaust side of multi-online air-conditioning system is more than first
When preset value, shows that the refrigerant for participating in cooling system cycle is not suitable with the refrigeration demand of current system, unnecessary refrigerant can be caused to lead
The problem of causing two device liquid storages.At this point, opening the first solenoid valve 520 and electric expansion valve 510, keep the part of participation refrigeration cycle cold
Matchmaker flows back into gas-liquid separator 710 from flow-rate adjustment branch, and compressor 400 is flowed back into again after the separation of gas-liquid separator 710,
To reduce the cold medium flux for participating in refrigeration cycle.
In embodiments of the present invention, by the way that flow-rate adjustment branch is arranged, one end of flow-rate adjustment branch is connected to outdoor and changes
Connecting line between hot device 300 and indoor heat exchanger unit, the other end are connected to four-way valve 200 and 400 gas returning port of compressor
Between connecting line, the first pressure value of multi-online air-conditioning system refrigerating operaton and exhaust side be more than the first preset value when,
Turn-on flow rate adjusts the electric expansion valve 510 and the first solenoid valve 520 in branch, makes the part refrigerant of participation refrigeration cycle from stream
Amount adjusts branch and flows back into compressor 400, to reduce the coolant quantity for participating in refrigeration cycle, reduces 400 operating load of compressor, subtracts
Mini system output power, avoid unnecessary refrigerant by indoor unit it is long-distance cycle and caused by crushing, enable cold medium flux more effectively
Adapt to the different refrigeration demand of indoor unit, keep system operation stability and reliability.
Further, the setting based on above-mentioned multi-online air-conditioning system, as shown in Figure 1, above-mentioned flow-rate adjustment branch is also
Including second solenoid valve 530, for adjusting the cold medium flux for participating in heating cycle.The output end of second solenoid valve 530 is connected to
Connecting line between first solenoid valve 520 and electric expansion valve 510, the input terminal of second solenoid valve 530 are connected to compressor
Connecting line between 400 exhaust outlets and four-way valve 200.
In multi-online air-conditioning system heating operation, and the first pressure value of the total return-air side of multi-online air-conditioning system is more than first
When preset value, shows that the refrigerant of participation system heating cycle is not suitable with the heating needs of current system, unnecessary refrigerant can be caused to lead
The problem of causing two device liquid storages.At this point, closing the first solenoid valve 520, second solenoid valve 530 and electric expansion valve 510 are opened, ginseng is made
Pass through condenser reflux to gas-liquid separator 710, by gas-liquid separation from flow-rate adjustment branch with the part refrigerant of heating cycle
Device 710 flows back into compressor 400 again after detaching, to reduce the cold medium flux for participating in heating cycle.
In embodiments of the present invention, by the way that second solenoid valve 530 is arranged in flow-rate adjustment branch, in multi-online air-conditioning system
When the first pressure value of heating operation and exhaust side is more than the first preset value, the first solenoid valve 520 is closed, turn-on flow rate adjusts branch
Electric expansion valve 510 in road and second solenoid valve 530 make the part refrigerant of participation heating cycle flow back from flow-rate adjustment branch
Reduce 400 operating load of compressor to reduce the coolant quantity for participating in heating cycle to compressor 400, reduce system output work(
Rate, avoid unnecessary refrigerant by indoor unit it is long-distance cycle and caused by crushing, so that cold medium flux is more effectively adapted to indoor unit
Different heating needs keep system operation stability and reliability.In addition, also can avoid indoor unit radiates heat release, improves and use
The comfort at family, and booster action is played in the evaporation that can absorb heat to outdoor unit, improves suction temperature.
Wherein, in system high-low pressure exception, (such as total exhaust lateral pressure value and the pressure value of total return-air side are greater than or equal to
Preset value etc.) or the total exhaust side temperature exception (such as total exhaust side temperature is greater than or equal to preset temperature) of system, at this time may be used
The first solenoid valve 520 and second solenoid valve 530 are opened, electric expansion valve 510 is closed, forms the total return-air side of system and total exhaust side
Between bypass circulation, make system high-low pressure balance, achieve the purpose that gas bypass pressure release.
It should be noted that including second solenoid valve 530 and multi-online air-conditioning system refrigeration fortune in multi-online air-conditioning system
When row, when the first pressure value of total exhaust side is more than the first preset value, the first solenoid valve 520 and electric expansion valve 510 are opened
While, second solenoid valve 530 need to be closed, to realize the reduction of the cold medium flux to participating in refrigeration cycle.
In addition, can also only include second solenoid valve 530 and electronic expansion in the flow-rate adjustment branch of multi-online air-conditioning system
Valve 510 does not include the first solenoid valve 520, is served only for the adjusting of the cold medium flux to participating in refrigeration cycle.Specifically, being arranged always
When the first pressure value of gas side is more than the first preset value, while opening second solenoid valve 530 and electric expansion valve 510, with reality
The now reduction to the cold medium flux for participating in heating cycle.
Further, as shown in Figure 1, in above-mentioned multi-online air-conditioning system, flow-rate adjustment branch further includes capillary
540, capillary 540 is connected with second solenoid valve 530, and one end of capillary 540 is connect with the input terminal of second solenoid valve 530,
The other end of capillary 540 is connected to the connecting line between 400 exhaust outlet of compressor and four-way valve 200.Due to being transported in heating
The input terminal of flow-rate adjustment branch is gaseous coolant when row, and output end is liquid refrigerants, thus the pressure of the flow-rate adjustment branch
Poor larger, the second solenoid valve 530 and electric expansion valve 510 in road in order to protect flow-rate adjustment, thus capillary can be set
540 throttle.In addition, when system high-low pressure is abnormal and the total exhaust side temperature exception of system, the first solenoid valve 520 and the
Two solenoid valves 530 are opened, and electric expansion valve 510 is closed, by the pressure release that 540 feasible system of capillary is arranged.
Specifically, as shown in Figure 1, multi-online air-conditioning system further includes being set to outdoor heat exchanger 300 and indoor heat exchanger machine
Fluid reservoir 600 between group, fluid reservoir 600 have first interface, second interface and third interface, first interface and outdoor heat exchange
Device 300 connects, and second interface is connect with indoor heat exchanger unit, and third interface is connect with the first end of electric expansion valve 510.It is logical
The setting for crossing fluid reservoir 600, when multi-online air-conditioning system is run, refrigerant can be stored in fluid reservoir 600, lasting for refrigeration
Or heating cycle provides enough refrigerants, ensures the stability of system operation.Flow-rate adjustment branch and the third of fluid reservoir 600 connect
Mouth connection is realized by the way that the coolant quantity in fluid reservoir 600 is adjusted, while to ensure system run all right and is reduced
Participate in the cold medium flux of refrigeration or heating cycle；In addition, flow-rate adjustment branch can be in multi-online air-conditioning system refrigerating operaton, it will
600 liquid storage of fluid reservoir deposits the lubricating oil to get off and flows back to gas-liquid separator 710, to be entered again by 400 air-breathing of compressor
Secondary cycle.
Specifically, as shown in Figure 1, in above-mentioned multi-online air-conditioning system, the second end of electric expansion valve 510 can be equipped with
First pressure sensor 910, flow-rate adjustment when for freezing, in refrigerating operaton, detection is cold into flow-rate adjustment branch
Refrigerant pressure value of the matchmaker after the adjusting of electric expansion valve 510；The first end of electric expansion valve 510 can be equipped with second pressure and sense
Device 920, flow-rate adjustment when for heating, in heating operation, the refrigerant of detection into flow-rate adjustment branch is swollen by electronics
Refrigerant pressure value after the adjusting of swollen valve 510.In addition, in total exhaust side (such as exhaust of compressor 400 of multi-online air-conditioning system
Mouthful) third pressure sensor 930, the first pressure value for detecting the total exhaust side of above system can be equipped with；In multi-gang air-conditioner
Total return-air side (such as gas returning port of compressor 400) of system can be equipped with the 4th pressure sensor 940, be used for the total return-air of detecting system
The second pressure value of side.
In addition, the embodiment of the present invention also proposes a kind of multi-online air-conditioning system control device, the multi-online air-conditioning system control
Device processed includes：Memory, processor and storage on a memory and the computer program that can run on a processor, computer
The step of following multi-online air-conditioning system control method is realized when program is executed by processor.
Wherein, multi-online air-conditioning system further includes above-mentioned multi-online air-conditioning system control device, multi-online air-conditioning system control
Device processed is installed in multi-online air-conditioning system, is sensed with compressor 400 and above-mentioned first pressure sensor 910, second pressure
Device 920, third pressure sensor 930 and the 4th pressure sensor 940 communication connection, and with above-mentioned first solenoid valve 520,
Second solenoid valve 530 and electric expansion valve 510 are electrically connected.Wherein, multi-online air-conditioning system control device can control first pressure
Sensor 910, second pressure sensor 920, third pressure sensor 930 and the 4th pressure sensor 940 carry out data and adopt
Collect and receive the data that above-mentioned pressure sensor is acquired, can control the unlatching of the first solenoid valve 520, second solenoid valve 530
And closure, the unlatching of controllable electric expansion valve 510 are closed and are opened to required aperture.
Specifically, the multi-online air-conditioning system control device includes：Processor, such as CPU, data-interface, memory lead to
Believe bus.Wherein, communication bus is for realizing the connection communication between these components.Data-interface is for receiving first pressure biography
The detection data of sensor 910, second pressure sensor 920, third pressure sensor 930 and the 4th pressure sensor 940 etc..
Memory can be high-speed RAM memory, can also be stable memory (non-volatile memory), such as disk
Memory.Memory optionally can also be the storage device independently of aforementioned processor.
It will be understood by those skilled in the art that the restriction of above-mentioned apparatus structure not structure twin installation, may include than upper
More or fewer components are stated, certain components or different components arrangement are either combined.
As may include in a kind of memory of computer storage media multi-online air-conditioning system control program, processor
It can be used for calling the multi-online air-conditioning system control program stored in memory, and execute following multi-online air-conditioning system control
The operation of method.
The embodiment of the present invention provides a kind of multi-online air-conditioning system control method, the stream based on above-mentioned multi-online air-conditioning system
When amount adjusts branch not including second solenoid valve 530, with reference to Fig. 2, the multi-online air-conditioning system control method includes following step
Suddenly：
Step S10 obtains the total exhaust side of the multi-online air-conditioning system in the multi-online air-conditioning system refrigerating operaton
Current first pressure value；
Step S20 opens the first solenoid valve when the current first pressure value of total exhaust side is more than the first preset value
520 and electric expansion valve 510；
It is described with reference to Fig. 3 when flow-rate adjustment branch based on above-mentioned multi-online air-conditioning system includes second solenoid valve 530
Multi-online air-conditioning system control method includes the following steps：
Step S30 obtains the total exhaust side of the multi-online air-conditioning system in the multi-online air-conditioning system refrigerating operaton
Current first pressure value；
Step S40 closes described the when the current first pressure value of total exhaust side is more than first preset value
Two solenoid valves 530 open first solenoid valve 520 and the electric expansion valve 510.
It is preset when the first pressure value of the total exhaust side of multi-online air-conditioning system (such as exhaust outlet of compressor 400) is more than first
When value, shows that the refrigerant for participating in cooling system cycle is not suitable with the refrigeration demand of current system, unnecessary refrigerant can be caused to lead to two
The problem of device liquid storage.When multi-online air-conditioning system does not include second solenoid valve 530, opens the first solenoid valve 520 and electronics is swollen
Swollen valve 510；Or when multi-online air-conditioning system includes second solenoid valve 530, second solenoid valve 530 is closed, and open first
Solenoid valve 520 and electric expansion valve 510.The part refrigerant for participating in refrigeration cycle at this time passes sequentially through the electricity in flow-rate adjustment branch
Sub- expansion valve 510 and the first solenoid valve 520, gas-liquid separator 710 are passed straight back to compressor 400.
In addition, when multi-online air-conditioning system includes second solenoid valve 530, cut off in addition to closing second solenoid valve 530
The refrigerant of 530 place branch of second solenoid valve flows, and can also be realized to second solenoid valve 530 by controlling the operation of other component
The cut-out of place branch avoids the refrigerant of 400 exhaust outlet of compressor directly by second solenoid valve 530, the first solenoid valve 520
Gas returning port is flowed back into, normal refrigeration cycle is cannot achieve.
Wherein, the initial opening after electric expansion valve 510 is opened can be specially default aperture, and the size for presetting aperture can
Specifically it is arranged according to the actual conditions of regulating system；Also it can always be returned according to the current first pressure value of total exhaust side and system
Pressure difference or other numerical relations between the 4th current respective specific size of pressure value of gas side or both, which correspond to, to be determined；
It can also be according to the second pressure value of 510 second end of electric expansion valve and the respective specific size of above-mentioned 4th pressure value or both
Between pressure difference or other numerical relations correspond to determine, etc..
When the first pressure value of the total exhaust side of multi-online air-conditioning system is less than or equal to the first preset value, show to participate in system
The refrigerant of controlling SAPMAC method adapts to the refrigeration demand of current system, or even if can if being not suitable with the refrigeration demand of current system
Flow-rate adjustment is carried out by the other existing throttle parts of multi-online air-conditioning system, is not in unnecessary refrigerant.At this point, flow tune
Section branch can be not involved in the adjusting of flow, i.e. the first solenoid valve 520 and electric expansion valve 510 are in closed state, in multi-connected machine
When air-conditioning system includes second solenoid valve 530, second solenoid valve 530 is also at closed state.
In embodiments of the present invention, by not including second solenoid valve 530, and total exhaust side in multi-online air-conditioning system
When the first pressure value of (such as exhaust outlet of compressor 400) is more than the first preset value, the first solenoid valve 520 and electronic expansion are opened
Valve 510；Or in multi-online air-conditioning system include second solenoid valve 530, and total exhaust side (such as the exhaust outlet of compressor 400)
When first pressure value is more than the first preset value, second solenoid valve 530 is closed, and open the first solenoid valve 520 and electric expansion valve
510, so that the part refrigerant of participation refrigeration cycle is passed sequentially through the electric expansion valve 510 in flow-rate adjustment branch, the first solenoid valve
520 are passed straight back to compressor 400, to reduce the coolant quantity for participating in refrigeration cycle, reduce 400 operating load of compressor, reduce
System output power, avoid unnecessary refrigerant by indoor unit it is long-distance cycle and caused by crushing, enable cold medium flux more effectively
The different refrigeration demand of indoor unit is adapted to, system operation stability and reliability are kept.In addition, being equipped in multi-online air-conditioning system
When fluid reservoir 600,600 liquid storage of fluid reservoir is deposited into the lubricating oil to get off and flows back to gas-liquid separator 710, to pass through compressor
400 air-breathings enter to be recycled again.
Further, described multi-joint when the multi-online air-conditioning system includes the second solenoid valve 530 with reference to Fig. 4
Air conditioner system control method includes the following steps：
Step S50 obtains the total exhaust side of the multi-online air-conditioning system in the multi-online air-conditioning system heating operation
Current second pressure value；
Step S60 closes first electricity when the current second pressure value of total exhaust side is more than the second preset value
Magnet valve 520 opens the second solenoid valve 530 and the electric expansion valve 510.
It is preset when the first pressure value of the total exhaust side of multi-online air-conditioning system (such as exhaust outlet of compressor 400) is more than first
When value, shows that the refrigerant of participation system heating cycle is not suitable with the heating needs of current system, unnecessary refrigerant can be caused to lead to two
The problem of device liquid storage.At this point, closing second solenoid valve 530, and open the first solenoid valve 520 and electric expansion valve 510.Join at this time
Second solenoid valve 530 and electric expansion valve 510, the outdoor in flow-rate adjustment branch are passed sequentially through with the part refrigerant of heating cycle
Evaporator flows back into compressor 400.
Wherein, the initial opening after electric expansion valve 510 is opened can be specially default aperture, and the size for presetting aperture can
Specifically it is arranged according to the actual conditions of regulating system；Also it can always be returned according to the current first pressure value of total exhaust side and system
Pressure difference or other numerical relations between the 4th current respective specific size of pressure value of gas side or both, which correspond to, to be determined；
Also it can be worth respective specific size or both according to the 5th pressure value of 510 first end of electric expansion valve and above-mentioned first pressure
Between pressure difference or other numerical relations correspond to determine, etc..
When the first pressure value of the total exhaust side of multi-online air-conditioning system is less than or equal to the first preset value, show to participate in system
The refrigerant of controlling thermal cycle adapts to the heating needs of current system, or even if can if being not suitable with the heating needs of current system
Flow-rate adjustment is carried out by the other existing throttle parts of multi-online air-conditioning system, is not in unnecessary refrigerant.At this point, flow tune
Section branch can be not involved in the adjusting of flow, i.e. the first solenoid valve 520, second solenoid valve 530 and electric expansion valve 510 is in and closes
Conjunction state.
It should be noted that when multi-online air-conditioning system is not provided with the first solenoid valve 520, the second electromagnetism can be directly opened
Valve and electric expansion valve 510, the adjusting of cold medium flux when to realize to heating operation.
In the present embodiment, include second solenoid valve 530 in multi-online air-conditioning system, and multi-online air-conditioning system heating is transported
When the second pressure value of row and exhaust side is more than the first preset value, the first solenoid valve 520 is closed, turn-on flow rate is adjusted in branch
Electric expansion valve 510 and second solenoid valve 530 make the part refrigerant of participation heating cycle flow back into compression from flow-rate adjustment branch
Machine 400 reduces 400 operating load of compressor, reduces system output power, avoid to reduce the coolant quantity for participating in heating cycle
Unnecessary refrigerant crushing caused by by the long-distance cycle of indoor unit, enables cold medium flux more effectively to adapt to the different system of indoor unit
Heat demand keeps system operation stability and reliability.In addition, also can avoid indoor unit radiates heat release, the comfortable of user is improved
Property, and booster action is played in the evaporation that can absorb heat to outdoor unit, improves suction temperature.
After the step of reference Fig. 5, opening electric expansion valve 510, further include：
Step S70 judges the numerical value where the current first pressure value of total exhaust side or current second pressure value
Section；
Step S80 adjusts the current aperture of the electric expansion valve 510 according to the numerical intervals of judgement.
Current system is adapted to since the different pressure values of total exhaust side can characterize the current refrigerant circulation flow for participating in cycle
The refrigeration or heating needs of system and the operating status of system.Thus, it is suitable for the refrigeration or heating fortune of multi-online air-conditioning system
The situation of refrigerant, the pressure value relationship of the operating condition of system and the total exhaust side of system when row, in advance by the total exhaust side of system
Pressure value is divided into several numerical intervals.
Wherein, freeze and heat and be suitable for respective operating condition and be provided with identical or different numerical intervals.It is different
Numerical intervals can be corresponding with the target aperture of different electric expansion valves 510 or the regulated quantity etc. of aperture.
After getting the current first pressure value of total exhaust side in refrigerating operaton, or total row is got in heating operation
After the current second pressure value in gas side, the numerical intervals where first pressure value or second pressure value are judged, according to the number of judgement
Value section determines the target aperture of corresponding electric expansion valve 510 or the regulated quantity of aperture, adjusts electric expansion valve 510 to determination
Target aperture, either according to the regulated quantity of aperture increase or reduce electric expansion valve 510 current aperture or keep electronics
Current aperture of expansion valve 510 etc..
In the present embodiment, after opening electric expansion valve 510, the first pressure value current by judging total exhaust side
Or the numerical intervals where current second pressure value, it adjusts the current of electric expansion valve 510 according to the numerical intervals of judgement and opens
Degree passes through the coolant quantity after 510 adjustment effect of electric expansion valve in flow-rate adjustment branch, it can be achieved that in refrigeration or heating operation
It can be more effectively adapted to the practical operation situation of current multi-online air-conditioning system, further decrease 400 operating load of compressor,
Reduce system output power, improves system run all right and reliability.
It is wrapped specifically, the numerical intervals according to judgement adjust the step of current aperture of the electric expansion valve 510
It includes：
Step S81, when the numerical intervals of judgement for first pressure section when, control the electric expansion valve 510 holding work as
Preceding aperture operation；
Step S82, when the numerical intervals of judgement for second pressure section when, control the electric expansion valve 510 according to pre-
If rule increases current aperture；
Step S83, when the numerical intervals of judgement for third pressure range when, close the electric expansion valve 510；
Pressure value in the second pressure section>Pressure value in the first pressure section>The third pressure area
Between in pressure value.
When the numerical intervals of judgement for first pressure section when, although illustrate current system participate in cycle coolant quantity mistake
It is more, but so that system is restored to normal operating condition by the adjusting of the present flow rate of flow-rate adjustment branch, at this time controllably
Electric expansion valve 510 processed keeps current aperture to run.
When the numerical intervals of judgement for second pressure section when, illustrate flow-rate adjustment branch present flow rate adjust under, be
System can control electric expansion valve 510 according to pre- at this time there are still abnormal (routinely having coolant quantity exception or system jams abnormal)
If rule increases current aperture, make the fast quick-recovery normal operating condition of system, wherein preset rules can be preset aperture regulation
Increment, or the target aperture etc. of current system conditions is corresponded to, it can be configured according to the actual operation.
When the numerical intervals of judgement for third pressure range when, illustrate that the pressure of system is normal, at this point, it is swollen to close electronics
Swollen valve 510, stops the adjustment effect of flow-rate adjustment branch, while after a certain period of time, first can be closed in refrigerating operaton
Solenoid valve 520 can close second solenoid valve 530 in heating operation, to completely enclose the flow-rate adjustment branch, refrigerant be avoided to accumulate
There are in the branch.
Wherein, first pressure section, second pressure section, third pressure range can be separately adapted to refrigeration and heating operation
Different situations and have different settings.
Further, the multi-online air-conditioning system control method further includes：
Step 01, in the multi-online air-conditioning system refrigerating operaton, the of 510 second end of the electric expansion valve is obtained
4th pressure value of total return-air side of three pressure values and the multi-online air-conditioning system；
Step 02, judge the first difference of the third pressure value and the 4th pressure value whether in the 4th pressure area
Between；
If so, execute it is described when the numerical intervals of judgement for first pressure section when, control the electric expansion valve 510
The step of keeping current aperture to run and it is described when the numerical intervals of judgement for second pressure section when, control the electronics
The step of expansion valve 510 increases current aperture according to preset rules；Or,
Step 03, in the multi-online air-conditioning system heating operation, the of 510 first end of the electric expansion valve is obtained
Five pressure values；
Step 04, judge the current second pressure value of total exhaust side and the 5th pressure value the second difference whether
In the 5th pressure range；
If so, execute it is described when the numerical intervals of judgement for first pressure section when, control the electric expansion valve 510
The step of keeping current aperture to run and it is described when the numerical intervals of judgement for second pressure section when, control the electronics
The step of expansion valve 510 increases current aperture according to preset rules.
S01 and S02 through the above steps can be by judging the third after electric expansion valve 510 is adjusted in refrigerating operaton
Whether the first difference of pressure value and the 4th pressure value of the total return-air side of system is in the 4th pressure range, to judge refrigerant return extremely
Whether the pressure of the entire access of compressor 400 is in normal range (NR), if in the 4th pressure range, shows refrigerant return to compression
The entire access of machine 400 is in normal condition, can realize and adjust to the coolant quantity of system；If not in the 4th pressure range, table
There is exception, such as blocking or 710 failure of gas-liquid separator in bright refrigerant return to the access of compressor 400, at this point, controllable
Compressor 400 is shut down to realize the protection to multi-online air-conditioning system.
S03 and S04 through the above steps can be by judging the 5th after electric expansion valve 510 is adjusted in heating operation
Whether the second difference of pressure value and the current second pressure value of the total exhaust side of system is in the 5th pressure range, to judge compressor
If whether the pressure difference of access shows in normal range (NR) in the 5th pressure range between 400 total exhaust sides and flow-rate adjustment branch
The part refrigerant of 400 total exhaust side of compressor effectively can be back to compressor 400 by flow-rate adjustment branch, can be to system
Coolant quantity, which is realized, to be adjusted；If not in the 5th pressure range, show to lead between 400 total exhaust side of compressor and flow-rate adjustment branch
There is exception, such as blocking or 720 failure of oil eliminator in road, at this point, controllable compressor 400 is shut down to realize to multi-connected machine sky
The protection of adjusting system.
By the above-mentioned means, when can guarantee multi-online air-conditioning system normal operation, just to the flow of multi-online air-conditioning system
Regulated and controled, to ensure the stability and reliability of the operation of multi-connection air-conditioning system.
Further, it is described when the numerical intervals of judgement for second pressure section when, control the electric expansion valve 510 and press
Further include after the step of increasing current aperture according to preset rules：
Step S821 judges the first current pressure of total exhaust side in the multi-online air-conditioning system refrigerating operaton
Whether force value is located at the first pressure section, and/or, whether first difference is located at the 6th pressure range；If it is not, then holding
Row step S822, if so, thening follow the steps S823.
Step S822, control compressor 400 are out of service；
Step S823, control electric expansion valve 510 keep current aperture.
Step S824 judges the second current pressure of total exhaust side in the multi-online air-conditioning system heating operation
Whether force value is located at the first pressure section, and/or, whether second difference is located at the 7th pressure range；If it is not, then holding
Row step S825, if so, thening follow the steps S826.
Step S825, control compressor 400 are out of service；
Step S826, control electric expansion valve 510 keep current aperture.
In refrigerating operaton, after control electric expansion valve 510 increases current aperture, if the current first pressure of total exhaust side
Value is located at the first pressure section, and/or, the first difference is located at the 6th pressure range, it is believed that, electric expansion valve 510 is worked as
Preceding aperture can be effectively by system regulation to normal operating condition；If total current first pressure value of exhaust side is not located at described the
One pressure range, and/or, the first difference is not located at the 6th pressure range, then shows that multi-online air-conditioning system breaks down, controllably
Compressor 400 processed is out of service to include with realize system, in addition, being overhauled to system, investigation is abnormal.Pass through above-mentioned side
Formula, it is ensured that normal operation of the multi-online air-conditioning system in refrigerating operaton.
In heating operation, after control electric expansion valve 510 increases current aperture, if the current second pressure of total exhaust side
Value is located at the first pressure section, and/or, the second difference is located at the 7th pressure range, it is believed that, electric expansion valve 510 is worked as
Preceding aperture can be effectively by system regulation to normal operating condition；If total current second pressure value of exhaust side is not located at described the
One pressure range, and/or, the second difference is not located at the 7th pressure range, then shows that multi-online air-conditioning system breaks down, controllably
Compressor 400 processed is out of service to realize the protection of system, in addition, being overhauled to system, investigation is abnormal.Pass through above-mentioned side
Formula, it is ensured that normal operation of the multi-online air-conditioning system in heating operation.
Specifically, step S821 or step can just be executed when the aperture of electric expansion valve 510 increases to maximum opening
S824, if first pressure value and/or the first difference cannot still meet the requirement in above-mentioned first pressure section and the 6th pressure range,
Or, if second pressure value and/or the second difference cannot still meet the requirement in above-mentioned first pressure section and the 7th pressure range, table
Bright its maximal regulated of flow-rate adjustment branch effect still, to normal operating condition, will cannot just control compressor 400 in system regulation
It is out of service, to play maximum regulating and controlling effect of the flow-rate adjustment branch to multi-online air-conditioning system, avoid the work of compressor 400 need not
The stoppage protection wanted ensures the stability and reliability of system operation.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that process, method, article or system including a series of elements include not only those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including this
There is also other identical elements in the process of element, method, article or system.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical scheme of the present invention substantially in other words does the prior art
Going out the part of contribution can be expressed in the form of software products, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disc, CD), including some instructions use so that a station terminal equipment (can be mobile phone,
Computer, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (12)
1. a kind of multi-online air-conditioning system, the multi-online air-conditioning system includes refrigerant circulation circuit, the refrigerant circulation circuit
Including indoor heat-exchange unit, four-way valve, outdoor heat exchanger and compressor made of piping connection, the interior heat-exchange unit packet
At least two indoor heat exchangers in parallel are included, the four-way valve has first port, second port, third port and the 4th end
Mouthful, there is the compressor exhaust outlet and gas returning port, the first port to be connect with the exhaust outlet, the second port and institute
State gas returning port connection, the third port connect with one end of the outdoor heat exchanger, the other end of the outdoor heat exchanger and
One end connection of the interior heat-exchange unit, the 4th port are connect with the other end of the indoor heat-exchange unit, feature
It is, the multi-online air-conditioning system further includes flow-rate adjustment branch, and the flow-rate adjustment branch includes：
Electric expansion valve, the electric expansion valve have a first end and a second end, and the first end of the electric expansion valve is connected to
Connecting line between the outdoor heat exchanger and the indoor heat-exchange unit；
The input terminal of first solenoid valve, first solenoid valve is connect with the second end of the electric expansion valve, first electricity
The output end of magnet valve is connected to the connecting line between the four-way valve and the compressor return air mouth.
2. multi-online air-conditioning system as described in claim 1, which is characterized in that the flow-rate adjustment branch further includes：
The output end of second solenoid valve, the second solenoid valve is connected between first solenoid valve and the electric expansion valve
Connecting line, the input terminal of the second solenoid valve is connected to the connection between the exhaust outlet of compressor and the four-way valve
Pipeline.
3. multi-online air-conditioning system as claimed in claim 2, which is characterized in that the flow-rate adjustment branch further includes：
Capillary, the capillary are connected with the second solenoid valve, one end of the capillary and the second solenoid valve
Input terminal connects, and the other end of the capillary is connected to the connecting tube between the exhaust outlet of compressor and the four-way valve
Road.
4. multi-online air-conditioning system as claimed any one in claims 1 to 3, which is characterized in that the multi-gang air-conditioner system
System further includes the fluid reservoir between the outdoor heat exchanger and the indoor heat-exchange unit, and the fluid reservoir has first to connect
Mouth, second interface and third interface, the first interface are connect with the outdoor heat exchanger, the second interface and the interior
Heat exchanger connects, and the third interface is connect with the first end of the electric expansion valve.
5. a kind of multi-online air-conditioning system control method is based on multi-gang air-conditioner system according to any one of claims 1 to 4
System, which is characterized in that when the multi-online air-conditioning system does not include second solenoid valve, the multi-online air-conditioning system controlling party
Method includes the following steps：
In the multi-online air-conditioning system refrigerating operaton, the first current pressure of the total exhaust side of the multi-online air-conditioning system is obtained
Force value；
When the current first pressure value of total exhaust side is more than the first preset value, the first solenoid valve and electronic expansion are opened
Valve.
6. air conditioner system control method as claimed in claim 5, which is characterized in that in the multi-online air-conditioning system include the
When two solenoid valves, the multi-online air-conditioning system control method includes the following steps：
In the multi-online air-conditioning system refrigerating operaton, the first current pressure of the total exhaust side of the multi-online air-conditioning system is obtained
Force value；
When the current first pressure value of total exhaust side is more than first preset value, the second solenoid valve is closed, is opened
Open first solenoid valve and the electric expansion valve.
7. multi-online air-conditioning system control method as claimed in claim 6, which is characterized in that the multi-online air-conditioning system control
Method processed includes the following steps：
In the multi-online air-conditioning system heating operation, the second current pressure of the total exhaust side of the multi-online air-conditioning system is obtained
Force value；
When the current second pressure value of total exhaust side is more than the second preset value, first solenoid valve is closed, opens institute
State second solenoid valve and the electric expansion valve.
8. multi-online air-conditioning system control method as claimed in claim 7, which is characterized in that described to close second electromagnetism
The step of valve, unlatching first solenoid valve and the electric expansion valve or closing first solenoid valve, open institute
After the step of stating second solenoid valve and the electric expansion valve, further include：
Judge the numerical intervals where the current first pressure value of total exhaust side or current second pressure value；
The current aperture of the electric expansion valve is adjusted according to the numerical intervals of judgement.
9. multi-online air-conditioning system control method as claimed in claim 8, which is characterized in that the numerical value area according to judgement
Between the step of adjusting the current aperture of the electric expansion valve include：
When the numerical intervals of judgement for first pressure section when, control the electric expansion valve and keep current aperture operation；
When the numerical intervals of judgement for second pressure section when, control the electric expansion valve according to preset rules increase currently open
Degree；
When the numerical intervals of judgement for third pressure range when, close the electric expansion valve；
Pressure value in the second pressure section>Pressure value in the first pressure section>In the third pressure range
Pressure value.
10. multi-online air-conditioning system control method as claimed in claim 9, which is characterized in that the multi-online air-conditioning system
Control method further includes：
In the multi-online air-conditioning system refrigerating operaton, third pressure value and the institute of the electric expansion valve second end are obtained
State the 4th pressure value of total return-air side of multi-online air-conditioning system；
Judge the first difference of the third pressure value and the 4th pressure value whether in the 4th pressure range；
If so, execute it is described when the numerical intervals of judgement for first pressure section when, control the electric expansion valve holding and work as
The step of preceding aperture operation and it is described when the numerical intervals of judgement for second pressure section when, control the electric expansion valve
The step of increasing current aperture according to preset rules；Or,
In the multi-online air-conditioning system heating operation, the 5th pressure value of the electric expansion valve first end is obtained；
Judge the second difference of the current second pressure value of total exhaust side and the 5th pressure value whether in the 5th pressure
Section；
If so, execute it is described when the numerical intervals of judgement for first pressure section when, control the electric expansion valve holding and work as
The step of preceding aperture operation and it is described when the numerical intervals of judgement for second pressure section when, control the electric expansion valve
The step of increasing current aperture according to preset rules.
11. multi-online air-conditioning system control method as claimed in claim 10, which is characterized in that the control electronics is swollen
Further include after the step of swollen valve increases current aperture according to preset rules：
In the multi-online air-conditioning system refrigerating operaton, judge whether the current first pressure value of total exhaust side is located at institute
First pressure section is stated, and/or, whether first difference is located at the 6th pressure range；
If it is not, it is out of service then to control compressor；Or,
In the multi-online air-conditioning system heating operation, judge whether the current second pressure value of total exhaust side is located at institute
First pressure section is stated, and/or, whether second difference is located at the 7th pressure range；
If it is not, it is out of service then to control the compressor.
12. a kind of multi-online air-conditioning system control device, which is characterized in that the multi-online air-conditioning system control device includes：
The multi-gang air-conditioner control program that memory, processor and being stored in can be run on the memory and on the processor,
The multi-gang air-conditioner control program is realized multi-joint as described in any one of claim 5 to 11 when being executed by the processor
The step of air conditioner system control method.
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