CN106247652A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
- Publication number
- CN106247652A CN106247652A CN201610867664.7A CN201610867664A CN106247652A CN 106247652 A CN106247652 A CN 106247652A CN 201610867664 A CN201610867664 A CN 201610867664A CN 106247652 A CN106247652 A CN 106247652A
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- China
- Prior art keywords
- expansion valve
- aperture
- electric expansion
- conditioning system
- air conditioning
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Classifications
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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
- F25B1/00—Compression machines, plants or systems with non-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
- 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
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
Abstract
The open a kind of air conditioning system of the present invention, including being sequentially connected with and formed the compressor of twin-tub independent compression of refrigerant circulation circuit, reversing unit, outdoor heat exchanger, the first electric expansion valve, gas-liquid separator, the second electric expansion valve, indoor heat exchanger；Air conditioning system also includes controller, according to the operational factor of air conditioning system, determines aperture and the aperture of the second electric expansion valve of the first electric expansion valve；During air conditioning system is run, target exhaust temperature according to compressor or the return-air degree of superheat, regulate the aperture of the second electric expansion valve, and when the aperture of the second electric expansion valve reaches aperture maximum or the aperture minima of this electric expansion valve, when compressor target exhaust temperature or the return-air degree of superheat are still unable to reach, adjust the aperture of the first electric expansion valve.The invention also discloses the control method of a kind of air conditioning system.The present invention is not only so that this air conditioning system can quickly meet operation demand, but also ensures the operational energy efficiency of air conditioning system.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly to a kind of air conditioning system and control method thereof.
Background technology
Current air conditioning system is not optimized cyclic design to the gaseous refrigerant after throttling and before entering vaporizer,
Cause gaseous refrigerant to affect evaporator heat exchange performance, and increase compressor compresses power consumption, thus have influence on energy efficiency of air conditioner
Level.
Although, air injection enthalpy-increasing and twin-tub compress technique can improve air conditioning system heating capacity under low temperature and ultralow temperature
Level, but in the control of air conditioning system, in order to ensure the properly functioning of air conditioning system and operational energy efficiency, throttling arrangement
Flow restriction control is of crucial importance, such as, when air conditioning system runs refrigeration mode, circulated outdoor heat exchanger by first throttle device
The coolant gone out carries out a reducing pressure by regulating flow, and the coolant being recycled to indoor heat exchanger by the second throttling arrangement carries out second throttle fall
Pressure.But existing flow restriction control is all independent control, is adjusted according to respective affecting parameters, air-conditioning so cannot be ensured
The operational energy efficiency of system.
Summary of the invention
The main object of the present invention is to provide a kind of air conditioning system and control method thereof, it is intended to solve existing air conditioning system
The technical problem of the operational energy efficiency of air conditioning system cannot be ensured when being independently controlled throttling.
For achieving the above object, a kind of air conditioning system that the present invention proposes, return including being sequentially connected with and formed refrigerant circulation
The compressor of twin-tub independent compression on road, reversing unit, outdoor heat exchanger, the first electric expansion valve, gas-liquid separator, the second electricity
Sub-expansion valve, indoor heat exchanger；Described air conditioning system also includes controller, and described controller is joined according to the operation of air conditioning system
Number, determines aperture K11 and aperture K21 of the second electric expansion valve of the first electric expansion valve；During air conditioning system is run, according to pressure
The target exhaust temperature of contracting machine or the return-air degree of superheat, regulate aperture K21 of the second electric expansion valve, and when the second electric expansion valve
Aperture K21 reach aperture maximum or the aperture minima of this electric expansion valve, compressor target exhaust temperature or return-air mistake
When temperature is still unable to reach, adjust aperture K11 of the first electric expansion valve.
Preferably, described controller is used for: when air conditioning system runs refrigeration mode, according to the compression of described air conditioning system
Machine running frequency and operation of air conditioner temperature, determine aperture K11 of the first electric expansion valve.
Preferably, the running frequency of described compressor includes current operation frequency or the frequency change of compressor；Described
Running temperature includes current temperature value or temperature change value.
Preferably, described controller is used for: according to delivery temperature or the return-air degree of superheat of described compressor, determines the second electricity
Aperture K21 of sub-expansion valve.
Preferably, described controller is used for: according to aperture K11 of the first electric expansion valve and preset difference value or preset ratio
Example value, determines aperture K21 of the second electric expansion valve.
Preferably, described controller is used for: when the aperture of the second electric expansion valve reaches the aperture of this electric expansion valve
When big value or aperture minima, compressor target exhaust temperature or the return-air degree of superheat are still unable to reach, control the first electronic expansion
Aperture K11 of valve adjusts in the range of [K11-Δ K, K11+ Δ K].
Preferably, the span of described Δ K is [0,0.1K], and wherein K is electric expansion valve maximum opening.
Additionally, for achieving the above object, present invention also offers the control method of a kind of air conditioning system, including following step
Rapid:
During operation of air conditioner, obtain the operational factor of air conditioning system；
Operational factor according to air conditioning system determines aperture K11 of the first electric expansion valve and the second electric expansion valve
Aperture K21；
During air conditioning system is run, according to target exhaust temperature or the return-air degree of superheat of compressor, regulate the second electronic expansion
Aperture K21 of valve；
When aperture K21 of the second electric expansion valve reaches the aperture maximum of this electric expansion valve, compressor target exhaust
When temperature or the return-air degree of superheat are still unable to reach, adjust aperture K11 of the first electric expansion valve.
Preferably, the described operational factor according to air conditioning system determines the step bag of aperture K11 of the first electric expansion valve
Include:
When air conditioning system runs refrigeration mode, according to compressor operating frequency and the operation of air conditioner temperature of described air conditioning system
Degree, determines aperture K11 of the first electric expansion valve.
Preferably, the described operational factor according to air conditioning system determines the step bag of aperture K21 of the second electric expansion valve
Include:
Delivery temperature according to described compressor or the return-air degree of superheat, determine aperture K21 of the second electric expansion valve；Or
Person,
Aperture K11 according to the first electric expansion valve and preset difference value or preset ratio value, determine the second electronic expansion
Aperture K21 of valve.
The present invention, in the throttling of air conditioning system controls, first determines opening of the first electric expansion valve according to air conditioner operation parameters
Degree and the aperture of the second electric expansion valve, then according to target exhaust temperature or the return-air degree of superheat of compressor, regulation the second electricity
The aperture of sub-expansion valve, and still it is unable to reach pressure in the second electronic expansion valve regulation to aperture maximum or aperture minima
When the target exhaust temperature of contracting machine or the return-air degree of superheat, regulate the aperture of the first electric expansion valve.Therefore, air-conditioning system of the present invention
System, by compressor air-discharging or return-air parameter, controls the regulation of the second electric expansion valve so that air conditioning system can quickly meet
Service requirement；During it addition, still service requirement cannot be met after regulating the second electric expansion valve, then regulate the first electronic expansion
Valve, to ensure the operational energy efficiency of air conditioning system.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the structural representation of air conditioning system one embodiment of the present invention；
Fig. 2 is the schematic flow sheet of control method one embodiment of air conditioning system of the present invention.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 1 | Compressor | 11 | First cylinder |
| 12 | Second cylinder | 13 | First fluid reservoir |
| 14 | Second fluid reservoir | 2 | Reversing unit |
| 3 | Outdoor heat exchanger | 4 | First electric expansion valve |
| 5 | Gas-liquid separator | 6 | Second electric expansion valve |
| 7 | Indoor heat exchanger |
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all its
His embodiment, broadly falls into the scope of protection of the invention.
If it is to be appreciated that the embodiment of the present invention relating to directivity instruction (such as up, down, left, right, before and after ...), then
It is only used for explanation relative position relation under a certain particular pose (as shown in drawings) between each parts, motion conditions etc.,
If this particular pose changes, then directionality instruction changes the most therewith.
If it addition, relate to the description of " first ", " second " etc. in the present invention, then it is only used for describing purpose, and can not
It is interpreted as instruction or implies its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can express or implicitly include at least one this feature.It addition, the skill between each embodiment
Art scheme can be combined with each other, but must be based on those of ordinary skill in the art are capable of, when technical scheme
Will be understood that the combination of this technical scheme does not exists, the most not at application claims when maybe cannot realize in conjunction with appearance is conflicting
Protection domain within.
Refer to Fig. 1, air conditioning system provided by the present invention, including: the twin-tub being sequentially communicated and being formed coolant loop is only
The compressor 1 of vertical compression, reversing unit 2, outdoor heat exchanger the 3, first electric expansion valve 4, gas-liquid separator the 5, second electronics are swollen
Swollen valve 6, indoor heat exchanger 7.Wherein compressor 1 includes housing, is provided with the first cylinder 11 and the second cylinder 12, housing in this housing
It is externally provided with the first fluid reservoir 13 and the second fluid reservoir 14.Be additionally provided with on compressor 1 housing connect with reversing unit 2 air vent,
The first gas returning port connected with the air entry of the first cylinder 11, and the second return-air connected with the air entry of the second cylinder 12
Mouthful.First liquid storage fills 13 one end and connects with reversing unit 2, the other end and the connection of the first gas returning port；Second liquid storage fill 14 one end with
Gas outlet's connection of gas-liquid separator 5, the other end and the connection of the second gas returning port.It is understood that this second liquid storage fills 14
Can also omit.Being communicated with the second fluid reservoir 14 at the second gas returning port is the stability in order to improve air conditioning system further.
This air-conditioning passes through the first cylinder 11 and independent compression of the second cylinder 12, after the compression that the first cylinder 11 is discharged
Then coolant and the coolant after the compression that the second cylinder 12 is discharged discharge from air vent in being drained into housing 1 respectively.It addition, gas
The gas outlet of liquid/gas separator 5 directly connects the gas returning port of compressor 1, and the coolant through the first electric expansion valve 4 passes through gas-liquid
After separator 5, gaseous coolant through gas-liquid separator 5 gas outlet to compressor second cylinder 12 circulation compression, reduce
Compression power consumption, improving energy efficiency.
Specifically, the span of the delivery space ratio of above-mentioned second cylinder 12 and the first cylinder 11 is 1%～10%.
Further, the span of the delivery space ratio of the second cylinder 12 and the first cylinder 11 is 1%～9%, it is preferable that second
The span of the delivery space ratio of cylinder 12 and the first cylinder 11 is 4%～9%.Such as second cylinder 12 and the first cylinder
The delivery space ratio of 11 can be the parameter such as 4%, 5%, 8% or 8.5%.
Above-mentioned reversing unit 2 is preferably cross valve, and it fills 13 by the first liquid storage and connects with the first gas returning port, reversing unit
2 include one of them connection in the first valve port D to the 4th valve port S, the first valve port D and the second valve port C and the 3rd valve port E, the
Another connection in four valve port S and the second valve port C and described 3rd valve port E, the air vent phase of the first valve port D and compressor 1
Even, the 4th valve port S and the first fluid reservoir 13 are connected.First end of outdoor heat exchanger 3 and the second valve port C are connected, indoor heat exchanger 4
The first end and the 3rd valve port E be connected.Specifically, when heating and air conditioner 100 is freezed, the first valve port D and the second valve port C is even
Logical and the 3rd valve port E and the 4th valve port S connects, when air conditioning system heats, and the first valve port D and the 3rd valve port E connection and second
Valve port C and the 4th valve port S connection.
Gas-liquid separator 5 includes gas outlet, first interface and the second interface, and gas outlet is connected with the second gas returning port,
First interface is connected with the second end of outdoor heat exchanger 3, and the second interface is connected with the second end of indoor heat exchanger 7, first interface
And the first electric expansion valve 4 of connecting between outdoor heat exchanger 3, the second electronics of connecting between the second interface and indoor heat exchanger 7 is swollen
Swollen valve 6.
Above-mentioned air conditioning system also includes controller, and this controller can be the functional unit being independently arranged, it is also possible to for
In air conditioning system, other assemblies controls the panel that functional unit is arranged together.Specifically, this controller is used for: according to air-conditioning
The operational factor of system determines aperture K11 and aperture K21 of the second electric expansion valve 6 of the first electric expansion valve 4；Air-conditioning system
During system runs, according to target exhaust temperature or the return-air degree of superheat of compressor, regulate aperture K21 of the second electric expansion valve, and
When aperture K21 of the second electric expansion valve reaches aperture maximum or the aperture minima of this electric expansion valve, compressor target
When delivery temperature or the return-air degree of superheat are still unable to reach, adjust aperture K11 of the first electric expansion valve.
Above-mentioned first electric expansion valve 4 and the second electric expansion valve 6 are adjustable choke valve, by changing valve passage
Sectional area reaches to regulate pressure and the purpose of flow.The open range of such as electric expansion valve is [0,450], i.e. electronic expansion
When the aperture of valve is 0, this choke valve completely closes, and coolant does not allows to pass through；When the aperture of electric expansion valve is 450, this throttling
Valve fully opens, and coolant all passes through.
In the embodiment of the present invention, by the first electric expansion valve and the control of the second electric expansion valve, it is achieved one-level saves
Stream blood pressure lowering and two-step throttle blood pressure lowering, after the coolant after one-level reducing pressure by regulating flow being carried out gas-liquid separation, gas coolant is recycled to simultaneously
Second cylinder 12 of compressor is circulated compression, and the gas being flowed in the coolant of indoor heat exchanger 7 when reducing refrigeration contains
Amount, and reduce the gas content in the coolant being flowed into outdoor heat exchanger 3 when heating, decrease gaseous coolant to as steaming
Send out the indoor heat exchanger 7 of device or the impact of the heat exchange property of outdoor heat exchanger 3, such that it is able to improve heat exchange efficiency, reduce pressure
The compression power consumption of contracting machine.
It is understood that due to during air conditioning system heating mode when refrigerant circulation circuit and air conditioning system refrigeration mode cold
When matchmaker's closed circuit contrast, i.e. air conditioning system run refrigeration mode, above-mentioned first electric expansion valve 4 is one-level reducing pressure by regulating flow
Effect, the second electric expansion valve 6 is two-step throttle hypotensive effect；When air conditioning system runs heating mode, the second electric expansion valve 6
For one-level reducing pressure by regulating flow effect, the first electric expansion valve 4 is two-step throttle hypotensive effect.Therefore, in the present invention, air conditioning system is transported
During row refrigeration mode, the control principle of the first electric expansion valve 4 and the second electric expansion valve 6 runs heating mode with air conditioning system
Time, the control principle of the second electric expansion valve 6 and the first electric expansion valve 4 is basically identical, therefore following example are only with air-conditioning system
System runs under refrigeration mode, and the throttling of electric expansion valve controls to be described.
In the present embodiment, by determine respectively according to the operational factor of air conditioning system the first electric expansion valve 4 aperture K11 and
Aperture K21 of the second electric expansion valve 6.Specifically:
When air conditioning system runs refrigeration mode, according to compressor operating frequency and the operation of air conditioner temperature of described air conditioning system
Degree, determines aperture K11 of the first electric expansion valve, after entering the first electric expansion valve flow restriction control in order to ensure refrigeration system,
Enter gas-liquid separation optimal intermediate pressure state.
In the present embodiment, operation of air conditioner temperature can include the delivery temperature of compressor, outdoor environment temperature, gas-liquid separator
Inlet temperature.Wherein, the running frequency of this compressor can read from the master control borad of air conditioning system, and the delivery temperature of compressor can
Obtaining with the temperature sensor of the air vent by being arranged on compressor, outdoor environment temperature can be by being disposed in the outdoor on machine
Temperature sensor obtain, gas-liquid separator inlet temperature can be by being arranged on the temperature sensing on gas-liquid separator inlet tube
Device obtains.It addition, the running frequency of above-mentioned compressor can include current operation frequency or the frequency change of compressor.Such as,
From the master control borad of air conditioning system, periodically read the running frequency of compressor, then calculate the operation of adjacent twice compressor
The difference of frequency, it is thus achieved that frequency change.Above-mentioned running temperature may also comprise current temperature value or temperature change value.
In the embodiment of the present invention, preset least one set weight coefficient the most within air-conditioning systems, when needing to calculate aperture, from
Read this weight coefficient at air conditioning system pre-stored location, further according to the operational factor of air conditioning system, be weighted summation, it is thus achieved that the
Aperture K11 of one electric expansion valve.Such as, aperture K11=A11 of the first electric expansion valve × frequency+B11 × ambient temperature+
C11 × delivery temperature+D11 × gas-liquid separator inlet temperature.What wherein A11, B11, C11, D11 prestored in being air conditioning system consolidates
Determine weight coefficient, can set and organize weight coefficient more, to be correspondingly arranged according to different operating conditions.It is understood that
Calculate that the parameter used by the aperture of the first electric expansion valve is alternatively in aforementioned four is the most several, certainly according to aforementioned four
The aperture of the first electric expansion valve that parameter calculates is more accurate.
When above-mentioned air conditioning system runs heating mode, before the determination process of aperture K21 of the second electric expansion valve can refer to
The determination process of aperture K11 of face the first electric expansion valve, does not repeats them here.
Further, controller noted above is additionally operable to: when air conditioning system runs refrigeration mode, according to the row of described compressor
Temperature or the return-air degree of superheat, determine aperture K21 of the second electric expansion valve, entered the second electronics in order to ensure refrigeration system swollen
After swollen valve flow restriction control, enter vaporizer optimum mass dryness fraction state, promote evaporation and heat-exchange ability.
Specifically, when air conditioning system runs refrigeration mode, aperture K21 of the second electric expansion valve 6 is according to the row of compressor
Temperature or the return-air degree of superheat determine.The delivery temperature of compressor is examined by being arranged on the temperature sensor at exhaust outlet of compressor
Surveying and obtain, the return-air degree of superheat of compressor refers to the suction temperature of compressor and the difference of evaporating temperature, when air conditioning system is run
During refrigeration mode, the return-air degree of superheat is the difference of the suction temperature of compressor and the evaporating temperature of indoor heat exchanger.This return-air
Temperature obtains by being arranged on the temperature sensor detection at the gas returning port of compressor, and evaporating temperature is by being disposed in the interior heat exchange
The temperature sensor detection of device obtains.In the present embodiment, can pre-set delivery temperature and the return-air degree of superheat respectively with electricity
Mapping relations between the aperture of sub-expansion valve, when obtaining delivery temperature or during the return-air degree of superheat, can according to these mapping relations,
Obtain aperture K21 of this second electric expansion valve.
In another example, aperture K21 of this second electric expansion valve 6 can also be according to the aperture of the first electric expansion valve 4
K11 and preset difference value or preset ratio value, determine aperture K21 of the second electric expansion valve.Such as, the present embodiment is first according to air-conditioning
Operational factor determines the aperture of an electric expansion valve, determines opening of another electric expansion valve further according to default difference or ratio value
Degree, because calculating respectively without the aperture of two electric expansion valves, such that it is able to realize the quick regulation of electric expansion valve, and
And control simple to operate.Specifically, the span of this preset difference value is [0,200], and the span of this preset ratio value is
[0.1,10].This preset difference value is pressed when being set to ensure air conditioning system actual motion under different operating modes from preset ratio value
Contracting machine does not return the value of liquid, it is ensured that system run all right, reliably.
When above-mentioned air conditioning system runs heating mode, before the determination process of aperture K11 of the first electric expansion valve can refer to
The determination process of aperture K21 of face the second electric expansion valve, does not repeats them here.
Further, in air conditioning system running, the aperture of the second electric expansion valve 6 is also by the mesh according to compressor
Mark delivery temperature or the return-air degree of superheat are adjusted, to be regulated by the aperture of the second electric expansion valve 6 so that current compressor
Delivery temperature reach target exhaust temperature, or current compressor reaches the default return-air degree of superheat.
Specifically, the current exhaust gas temperature of compressor is compared with target exhaust temperature, and according to comparative result, adjust
Save the aperture of the second electric expansion valve 6.When i.e. current exhaust gas temperature is less than target exhaust temperature, reduce the second electric expansion valve 6
Aperture, current exhaust gas temperature more than target exhaust temperature time, increase the aperture of the second electric expansion valve 6.Or, by compressor
The current return-air degree of superheat compare with the return-air degree of superheat preset, and according to comparative result, regulate the second electric expansion valve 6
Aperture.When the most current return-air degree of superheat is less than the return-air degree of superheat preset, reduce the aperture of the second electric expansion valve 6, currently
When the return-air degree of superheat is more than the return-air degree of superheat preset, increase the aperture of the second electric expansion valve 6, it is ensured that air conditioning system is at optimum
Recurrent state is operated, improving energy efficiency.
When the aperture of the second electric expansion valve reaches aperture maximum or aperture minima, the compressor of this electric expansion valve
When target exhaust temperature or the return-air degree of superheat are still unable to reach, control aperture K11 of the first electric expansion valve [K11-Δ K,
K11+ Δ K] in the range of adjust.
When the aperture of the second electric expansion valve 6 is adjusted, if it has reached the aperture of this electric expansion valve
Big value or aperture minima, and now compressor target exhaust temperature or the return-air degree of superheat are still unable to reach, and i.e. represent and pass through
The regulation of the second electric expansion valve 6 can not meet operation of air conditioner requirement.Therefore, the aperture of the first electric expansion valve 4 will be regulated
K11.And, in order to ensure the excessive adjustments of the aperture of the first electric expansion valve 4, in the present embodiment, a regulation model will be set
Enclose, i.e. [K11-Δ K, K11+ Δ K].The span of this Δ K is [0,0.1K], and wherein K is the maximum opening of electric expansion valve
Value.
The present invention, in the throttling of air conditioning system controls, first determines opening of the first electric expansion valve according to air conditioner operation parameters
Degree and the aperture of the second electric expansion valve, then according to target exhaust temperature or the return-air degree of superheat of compressor, regulation the second electricity
The aperture of sub-expansion valve, and still it is unable to reach pressure in the second electronic expansion valve regulation to aperture maximum or aperture minima
When the target exhaust temperature of contracting machine or the return-air degree of superheat, regulate the aperture of the first electric expansion valve.Therefore, air-conditioning system of the present invention
System, by compressor air-discharging or return-air parameter, controls the regulation of the second electric expansion valve so that air conditioning system can quickly meet
Service requirement；During it addition, still service requirement cannot be met after regulating the second electric expansion valve, then regulate the first electronic expansion
Valve, to ensure the operational energy efficiency of air conditioning system.
Accordingly, present invention also offers the control method of a kind of air conditioning system.As in figure 2 it is shown, the control of this air conditioning system
Method processed comprises the following steps:
During step S110, operation of air conditioner, obtain the operational factor of air conditioning system；
The operational factor of above-mentioned air conditioning system can include the running temperature of the running frequency of compressor, air conditioning system, wherein
This running temperature can include the delivery temperature of compressor, outdoor environment temperature, gas-liquid separator inlet temperature.Wherein, this compression
The running frequency of machine can read from the master control borad of air conditioning system, and the delivery temperature of compressor can be by being arranged on compressor
The temperature sensor of air vent obtains, and outdoor environment temperature can be obtained by the temperature sensor being disposed in the outdoor on machine, gas
Liquid/gas separator inlet temperature can be obtained by the temperature sensor being arranged on gas-liquid separator inlet tube.It addition, above-mentioned pressure
The running frequency of contracting machine can include current operation frequency or the frequency change of compressor.Such as, periodically from air conditioning system
Master control borad in read the running frequency of compressor, then calculate the difference of the running frequency of adjacent twice compressor, it is thus achieved that frequently
Rate changing value.Above-mentioned running temperature may also comprise current temperature value or temperature change value.
Step S120, operational factor according to air conditioning system determine aperture K11 and second electricity of the first electric expansion valve
Aperture K21 of sub-expansion valve；
According to the operational factor of above-mentioned air conditioning system, and the operational rule preset, it may be determined that the first electric expansion valve 4
Aperture K11 and aperture K21 of the second electric expansion valve 6.
During step S130, air conditioning system are run, according to target exhaust temperature or the return-air degree of superheat of compressor, regulate second
Aperture K21 of electric expansion valve；
Specifically, the current exhaust gas temperature of compressor is compared with target exhaust temperature, and according to comparative result, adjust
Save the aperture of the second electric expansion valve 6.When i.e. current exhaust gas temperature is less than target exhaust temperature, reduce the second electric expansion valve 6
Aperture, current exhaust gas temperature more than target exhaust temperature time, increase the aperture of the second electric expansion valve 6.Or, by compressor
The current return-air degree of superheat compare with the return-air degree of superheat preset, and according to comparative result, regulate the second electric expansion valve 6
Aperture.When the most current return-air degree of superheat is less than the return-air degree of superheat preset, reduce the aperture of the second electric expansion valve 6, currently
When the return-air degree of superheat is more than the return-air degree of superheat preset, increase the aperture of the second electric expansion valve 6, it is ensured that air conditioning system is at optimum
Recurrent state is operated, improving energy efficiency.
Step S140, reach the aperture maximum of this electric expansion valve, compressor when aperture K21 of the second electric expansion valve
When target exhaust temperature or the return-air degree of superheat are still unable to reach, adjust aperture K11 of the first electric expansion valve.
When the aperture of the second electric expansion valve reaches aperture maximum or aperture minima, the compressor of this electric expansion valve
When target exhaust temperature or the return-air degree of superheat are still unable to reach, control aperture K11 of the first electric expansion valve [K11-Δ K,
K11+ Δ K] in the range of adjust.
When the aperture of the second electric expansion valve 6 is adjusted, if it has reached the aperture of this electric expansion valve
Big value or aperture minima, and now compressor target exhaust temperature or the return-air degree of superheat are still unable to reach, and i.e. represent and pass through
The regulation of the second electric expansion valve 6 can not meet operation of air conditioner requirement.Therefore, the aperture of the first electric expansion valve 4 will be regulated
K11.And, in order to ensure the excessive adjustments of the aperture of the first electric expansion valve 4, in the present embodiment, a regulation model will be set
Enclose, i.e. [K11-Δ K, K11+ Δ K].The span of this Δ K is [0,0.1K], and wherein K is the maximum opening of electric expansion valve
Value.
The present invention, in the throttling of air conditioning system controls, first determines opening of the first electric expansion valve according to air conditioner operation parameters
Degree and the aperture of the second electric expansion valve, then according to target exhaust temperature or the return-air degree of superheat of compressor, regulation the second electricity
The aperture of sub-expansion valve, and still it is unable to reach pressure in the second electronic expansion valve regulation to aperture maximum or aperture minima
When the target exhaust temperature of contracting machine or the return-air degree of superheat, regulate the aperture of the first electric expansion valve.Therefore, air-conditioning system of the present invention
System, by compressor air-discharging or return-air parameter, controls the regulation of the second electric expansion valve so that air conditioning system can quickly meet
Service requirement；During it addition, still service requirement cannot be met after regulating the second electric expansion valve, then regulate the first electronic expansion
Valve, to ensure the operational energy efficiency of air conditioning system.
Further, above-mentioned steps S120 determining, aperture K11 of the first electric expansion valve specifically comprises the steps that in air-conditioning system
When system runs refrigeration mode, according to compressor operating frequency and the operation of air conditioner temperature of described air conditioning system, fixed first electronics is swollen
Aperture K11 of swollen valve.
In the embodiment of the present invention, preset least one set weight coefficient the most within air-conditioning systems, when needing to calculate aperture, from
Read this weight coefficient at air conditioning system pre-stored location, further according to the operational factor of air conditioning system, be weighted summation, it is thus achieved that the
Aperture K11 of one electric expansion valve.Such as, aperture K11=A11 of the first electric expansion valve × frequency+B11 × ambient temperature+
C11 × delivery temperature+D11 × gas-liquid separator inlet temperature.What wherein A11, B11, C11, D11 prestored in being air conditioning system consolidates
Determine weight coefficient, can set and organize weight coefficient more, to be correspondingly arranged according to different operating conditions.It is understood that
If it is the most several, certainly according to above-mentioned 4 that the parameter used by aperture calculating the first electric expansion valve is alternatively in aforementioned four
The aperture of the first electric expansion valve that individual parameter calculates is more accurate.
Further, above-mentioned steps S120 determining, aperture K21 of the second electric expansion valve specifically comprises the steps that according to described
The delivery temperature of compressor or the return-air degree of superheat, determine aperture K21 of the second electric expansion valve, entered in order to ensure refrigeration system
After second electric expansion valve flow restriction control, enter vaporizer optimum mass dryness fraction state, promote evaporation and heat-exchange ability.
In the present embodiment, aperture K21 of the second electric expansion valve 6 is true according to delivery temperature or the return-air degree of superheat of compressor
Fixed.The delivery temperature of compressor obtains by being arranged on the temperature sensor detection at exhaust outlet of compressor, the return-air of compressor
The degree of superheat refers to the suction temperature of compressor and the difference of evaporating temperature, and when air conditioning system runs refrigeration mode, return-air is overheated
Degree is the difference of the suction temperature of compressor and the evaporating temperature of indoor heat exchanger.This suction temperature is by being arranged on compressor
Gas returning port at temperature sensor detection obtain, evaporating temperature by be disposed in the interior heat exchanger temperature sensor detect obtain
?.In the present embodiment, delivery temperature and the return-air degree of superheat can be pre-set respectively and between the aperture of electric expansion valve
Mapping relations, when obtaining delivery temperature or the return-air degree of superheat, can be according to these mapping relations, it is thus achieved that this second electric expansion valve
Aperture K21 of 6.
In another example, it is also possible to according to aperture K11 of the first electric expansion valve and preset difference value or preset ratio value,
Determine aperture K21 of the second electric expansion valve.Specifically, the span of this preset difference value is [0,200], preset ratio value
Span is [0.1,10].The present embodiment first determines the aperture of an electric expansion valve according to air conditioner operation parameters, further according in advance
If difference determine the aperture of another electric expansion valve, because calculating respectively without the aperture of two electric expansion valves, thus
The quick regulation of electric expansion valve can be realized, and control simple to operate.
Further, above-mentioned steps S140 regulates aperture K11 of the first electric expansion valve concretely: control the first electricity
Aperture K11 of sub-expansion valve adjusts in the range of [K11-Δ K, K11+ Δ K].
During the aperture regulation of the second electric expansion valve 6, the aperture maximum of this electric expansion valve or aperture are reached
Little value, and now compressor target exhaust temperature or the return-air degree of superheat are still unable to reach, and i.e. represent by the second electronic expansion
The regulation of valve 6 can not meet operation of air conditioner requirement.Therefore, aperture K11 of the first electric expansion valve 4 will be regulated.And, in order to protect
Demonstrate,prove the excessive adjustments of the aperture of the first electric expansion valve 4, in the present embodiment, a range of accommodation will be set, i.e. [K11-Δ K,
K11+ΔK].The span of this Δ K is [0,0.1K], and wherein K is the maximum opening value of electric expansion valve.
The foregoing is only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every at this
Under the inventive concept of invention, utilize the equivalent structure transformation that description of the invention and accompanying drawing content are made, or directly/indirectly use
The technical field relevant at other is included in the scope of patent protection of the present invention.
Claims (10)
1. an air conditioning system, including being sequentially connected with and formed the compressor of twin-tub independent compression of refrigerant circulation circuit, commutation
Unit, outdoor heat exchanger, the first electric expansion valve, gas-liquid separator, the second electric expansion valve, indoor heat exchanger；Its feature exists
In, described air conditioning system also includes controller, and described controller, according to the operational factor of air conditioning system, determines the first electronic expansion
Aperture K11 of valve and aperture K21 of the second electric expansion valve；During air conditioning system is run, according to the target exhaust temperature of compressor
Or the return-air degree of superheat, regulate aperture K21 of the second electric expansion valve, and when aperture K21 of the second electric expansion valve reaches this electricity
When the aperture maximum of sub-expansion valve or aperture minima, compressor target exhaust temperature or the return-air degree of superheat are still unable to reach,
Adjust aperture K11 of the first electric expansion valve.
2. air conditioning system as claimed in claim 1, it is characterised in that described controller is used for: run refrigeration in air conditioning system
During pattern, according to compressor operating frequency and the operation of air conditioner temperature of described air conditioning system, determine opening of the first electric expansion valve
Degree K11.
3. air conditioning system as claimed in claim 2, it is characterised in that the running frequency of described compressor includes working as of compressor
Front running frequency or frequency change；Described running temperature includes current temperature value or temperature change value.
4. air conditioning system as claimed in claim 2, it is characterised in that described controller is used for: according to the row of described compressor
Temperature or the return-air degree of superheat, determine aperture K21 of the second electric expansion valve.
5. air conditioning system as claimed in claim 2, it is characterised in that described controller is used for: according to the first electric expansion valve
Aperture K11 and preset difference value or preset ratio value, determine aperture K21 of the second electric expansion valve.
6. air conditioning system as claimed in claim 5, it is characterised in that described controller is used for: when the second electric expansion valve
Aperture reaches aperture maximum or the aperture minima of this electric expansion valve, and compressor target exhaust temperature or the return-air degree of superheat are still
When being unable to reach, aperture K11 controlling the first electric expansion valve adjusts in the range of [K11-Δ K, K11+ Δ K].
7. air conditioning system as claimed in claim 1, it is characterised in that the span of described Δ K is [0,0.1K], wherein K
For electric expansion valve maximum opening value.
8. the control method of an air conditioning system, it is characterised in that comprise the following steps:
During operation of air conditioner, obtain the operational factor of air conditioning system；
Operational factor according to air conditioning system determines aperture K11 and the aperture of the second electric expansion valve of the first electric expansion valve
K21；
During air conditioning system is run, according to target exhaust temperature or the return-air degree of superheat of compressor, regulate the second electric expansion valve
Aperture K21；
When aperture K21 of the second electric expansion valve reaches the aperture maximum of this electric expansion valve, compressor target exhaust temperature
Or the return-air degree of superheat is when being still unable to reach, adjust aperture K11 of the first electric expansion valve.
9. the control method of air conditioning system as claimed in claim 8, it is characterised in that the described operation according to air conditioning system is joined
Number determines that the step of aperture K11 of the first electric expansion valve includes:
When air conditioning system runs refrigeration mode, according to compressor operating frequency and the operation of air conditioner temperature of described air conditioning system,
Determine aperture K11 of the first electric expansion valve.
10. the control method of air conditioning system as claimed in claim 9, it is characterised in that the described operation according to air conditioning system
The step of aperture K21 of parameter determination the second electric expansion valve includes:
Delivery temperature according to described compressor or the return-air degree of superheat, determine aperture K21 of the second electric expansion valve；Or,
Aperture K11 according to the first electric expansion valve and preset difference value or preset ratio value, determine the second electric expansion valve
Aperture K21.
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| CN201610867664.7A CN106247652A (en) | 2016-09-29 | 2016-09-29 | Air conditioning system and control method thereof |
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| CN111397104A (en) * | 2020-03-24 | 2020-07-10 | 珠海格力电器股份有限公司 | Control method and device of air conditioning system, control equipment, medium and air conditioning system |
| CN111829173A (en) * | 2019-04-23 | 2020-10-27 | 杭州先途电子有限公司 | Control method and system and air source heat pump air heater |
| CN113108439A (en) * | 2021-05-20 | 2021-07-13 | 广东美的制冷设备有限公司 | Control method and device of air conditioner, air conditioner and storage medium |
| WO2021208523A1 (en) * | 2020-04-14 | 2021-10-21 | 青岛海尔空调器有限总公司 | Oil return control method for compressor of air conditioning system in refrigeration mode |
| CN113739381A (en) * | 2020-05-29 | 2021-12-03 | 广东美的制冷设备有限公司 | Control method of air conditioner, air conditioner and computer readable storage medium |
| CN114061018A (en) * | 2020-07-30 | 2022-02-18 | 广东美的暖通设备有限公司 | Air conditioning system and detection method and detection device of electronic expansion valve thereof and controller |
| CN114893902A (en) * | 2022-04-25 | 2022-08-12 | 青岛海信日立空调系统有限公司 | Air conditioning system and control method thereof |
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| CN114893902A (en) * | 2022-04-25 | 2022-08-12 | 青岛海信日立空调系统有限公司 | Air conditioning system and control method thereof |
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