CN105864972A - Variable frequency air conditioner system and control methods thereof - Google Patents

Variable frequency air conditioner system and control methods thereof Download PDF

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Publication number
CN105864972A
CN105864972A CN201610231631.3A CN201610231631A CN105864972A CN 105864972 A CN105864972 A CN 105864972A CN 201610231631 A CN201610231631 A CN 201610231631A CN 105864972 A CN105864972 A CN 105864972A
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CN
China
Prior art keywords
expansion valve
valve
electric expansion
gear
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610231631.3A
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Chinese (zh)
Other versions
CN105864972B (en
Inventor
陈海群
廖四清
曾令华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Midea Toshiba Compressor Corp
Guangdong Meizhi Compressor Co Ltd
Anhui Meizhi Precision Manufacturing Co Ltd
Original Assignee
Guangdong Meizhi Compressor Co Ltd
Anhui Meizhi Precision Manufacturing Co Ltd
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Application filed by Guangdong Meizhi Compressor Co Ltd, Anhui Meizhi Precision Manufacturing Co Ltd filed Critical Guangdong Meizhi Compressor Co Ltd
Priority to CN201610231631.3A priority Critical patent/CN105864972B/en
Publication of CN105864972A publication Critical patent/CN105864972A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • F25B41/34Expansion valves with the valve member being actuated by electric means, e.g. by piezo-electric actuators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022Compressor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control 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
    • F24F11/85Control 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 variable-flow pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • F24F2110/12Temperature of the outside air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • F25B2600/021Inverters therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a variable frequency air conditioner system and control methods thereof. The variable frequency air conditioner system comprises a compressor, a first-stage electronic expansion valve and a second-stage electronic expansion valve located behind the first-stage electronic expansion valve in the flowing direction of coolants. In the refrigerating operation, the control method comprises the following steps that the outdoor environment temperature Toutdoor and the indoor environment temperature Tindoor are detected; the refrigeration temperature difference delta Tcool=Toutdoor-Tindoor is calculated according to the Toutdoor and the Tindoor; the rotation speed M of the compressor is detected; and the opening degree of a refrigerating valve of the first-stage electronic expansion valve is controlled according to the delta Tcool and the rotation speed M. In the heating operation, the control method comprises the following steps that the outdoor environment temperature Toutdoor and the indoor environment temperature Tindoor are detected; the heating temperature difference delta Theat=Toutdoor-Tindoor is calculated according to the Toutdoor and the Tindoor; the rotation speed N of the compressor is detected; and the opening degree of a heating valve of the first-stage electronic expansion valve is controlled according to the delta Theat and the rotation speed N. According to the control methods of the variable frequency air conditioner system, control is easy.

Description

Frequency-conversion air-conditioning system and control method thereof
Technical field
The present invention relates to air-conditioning technical field, especially relate to a kind of frequency-conversion air-conditioning system and control method thereof.
Background technology
In correlation technique, for using the frequency-conversion air-conditioning system of coolant injection formula compressor, the of coolant injection formula compressor One cylinder absorbs the refrigerant of flash-pot, and the second cylinder then absorbs the refrigerant from gas-liquid separator, if used When two expansion valves are controlled the first order throttling electric expansion valve control can extremely complex and to the first order throttle Need during electronic expansion valve controls to increase sensor, for example, it is desired to detection flasher temperature or the sensor of pressure, the Two temperature cylinders or the sensor etc. of pressure.
Summary of the invention
It is contemplated that at least solve one of technical problem present in prior art.To this end, one object of the present invention exists In the control method of a kind of frequency-conversion air-conditioning system of proposition, control simple.
Further object is that a kind of frequency-conversion air-conditioning system using above-mentioned control method of proposition.
The control method of frequency-conversion air-conditioning system according to a first aspect of the present invention, described frequency-conversion air-conditioning system include compressor, First order electric expansion valve, flow direction second level electric expansion valve behind along refrigerant, when described convertible frequency air-conditioner When cooling system runs, described control method comprises the following steps: detection outdoor environment temperature ToutdoorWith indoor environment temperature Degree Tindoor;According to Toutdoor、TindoorCalculate refrigeration temperature difference △ Tcool=Toutdoor-Tindoor;Detect the rotating speed M of described compressor; According to described refrigeration temperature difference △ TcoolWith the refrigeration that the rotating speed M of described compressor controls described first order electric expansion valve Valve opening;
When described frequency-conversion air-conditioning system heating operation, described control method comprises the following steps: detection outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor;According to Toutdoor、TindoorCalculating heats temperature difference △ Theat=Tindoor-Toutdoor;Detection The rotating speed N of described compressor;Temperature difference △ T is heated according to describedheatDescribed first is controlled with the rotating speed N of described compressor Level electric expansion valve heat valve opening.
The control method of the frequency-conversion air-conditioning system according to the present invention, by using above-mentioned control method to frequency-conversion air-conditioning system It is controlled, controls simple.
According to some embodiments of the present invention, the gear C of the refrigeration valve aperture of described first order electric expansion valve meets: C=A+B-1, wherein, described A is described refrigeration temperature difference △ TcoolThe gear of the corresponding refrigeration temperature difference, described B is described The gear of refrigeration compressor rotating speed corresponding for rotating speed M, described A, B, C be positive integer, and the described refrigeration temperature difference The gear number of gear number and described refrigeration compressor rotating speed is all higher than equal to 2, the system of described first order electric expansion valve Low temperature valve aperture is corresponding to the gear C of the refrigeration valve aperture of described first order electric expansion valve.
Specifically, the gear A of the described refrigeration temperature difference specifically includes: as △ TcoolDuring <-10 DEG C, A=1;As-10 DEG C≤△ TcoolDuring <-5 DEG C, A=2;As-5 DEG C≤△ TcoolDuring < 5 DEG C, A=3;As △ TcoolWhen >=5 DEG C, A=4.
Specifically, the gear B of described refrigeration compressor rotating speed specifically includes: as M >=70Hz, B=1;As M < 70Hz Time, B=2.
Specifically, the refrigeration valve aperture of described first order electric expansion valve is V1, the refrigeration of described first order electric expansion valve The gear C of valve opening specifically includes: as C=1, described V1=100 steps;As C=2, described V1=150 steps;When During C=3, described V1=200 steps;As C=4, described V1=300 steps;As C=5, described V1=400 steps.
According to some embodiments of the present invention, the gear F heating valve opening of described first order electric expansion valve meets: F=D+E-1, wherein, described D is for heating temperature difference △ TheatThe corresponding gear heating the temperature difference, described E is described rotating speed What N was corresponding heats the gear of compressor rotary speed, and described D, E, F are positive integer, and described in heat the gear of the temperature difference Number and the described gear number heating compressor rotary speed are all higher than equal to 2, and the valve that heats of described first order electric expansion valve is opened Spend the gear F heating valve opening corresponding to described first order electric expansion valve.
Specifically, the gear D heating the temperature difference described in specifically includes: as △ TheatDuring <-15 DEG C, D=1;As-15 DEG C≤△ TheatDuring <-8 DEG C, D=2;As-8 DEG C≤△ TheatDuring < 8 DEG C, D=3;As △ TheatWhen >=8 DEG C, D=4.
Specifically, described in heat the gear E of compressor rotary speed and specifically include: as N >=60Hz, E=1;As N < 60Hz Time, E=2.
Specifically, the valve opening that heats of described first order electric expansion valve is V2, heating of described first order electric expansion valve The gear F of valve opening specifically includes: as F=1, described V2=80 steps;As F=2, described V2=120 steps;When During F=3, described V2=180 steps;As F=4, described V2=250 steps;As F=5, described V2=300 steps.
According to some embodiments of the present invention, described outdoor environment temperature is the temperature of outdoor heat exchanger.
Alternatively, the temperature of described outdoor heat exchanger is the saturated temperature being converted into by the saturation pressure of described outdoor heat exchanger Degree.
According to some embodiments of the present invention, described indoor environment temperature is the temperature of indoor heat exchanger.
Alternatively, the temperature of described indoor heat exchanger is the saturated temperature being converted into by the saturation pressure of described indoor heat exchanger Degree.
The control method using the frequency-conversion air-conditioning system according to the above-mentioned first aspect of the present invention according to a second aspect of the present invention Frequency-conversion air-conditioning system, including: compressor, described compressor includes the first cylinder and the second cylinder, described first gas Cylinder has the first air entry, and described second cylinder has the second air entry, and described compressor has exhaust outlet;Control valve, Described control valve includes that the first valve port to the 4th valve port, described first valve port are connected with described exhaust outlet, the 3rd valve port with First air entry is connected;First Heat Exchanger, one end of described First Heat Exchanger is connected with described 4th valve port;Second changes Hot device, one end of described second heat exchanger is connected with the second valve port;Gas-liquid separator, described gas-liquid separator has One connector, the second connector and outlet, described outlet is connected with described second air entry;First electric expansion valve, One end of described first electric expansion valve is connected with the other end of described First Heat Exchanger, described first electric expansion valve The other end is connected with described first connector;And second electric expansion valve, one end of described second electric expansion valve with The other end of described second heat exchanger is connected, and the other end of described second electric expansion valve is connected with described second connector, When described frequency-conversion air-conditioning system refrigerating operaton, described first electric expansion valve is described first order electric expansion valve and institute Stating the second electric expansion valve is described second level electric expansion valve, when described frequency-conversion air-conditioning system heating operation, described Second electric expansion valve is described first order electric expansion valve and described first electric expansion valve is that described second level electronics is swollen Swollen valve.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become from the following description Substantially, or by the practice of the present invention recognize.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become bright from combining the accompanying drawings below description to embodiment Aobvious and easy to understand, wherein:
Fig. 1 is schematic diagram during frequency-conversion air-conditioning system refrigerating operaton according to embodiments of the present invention;
Fig. 2 is schematic diagram during frequency-conversion air-conditioning system heating operation according to embodiments of the present invention.
Reference:
100: frequency-conversion air-conditioning system;
1: compressor;11: the first air entries;12: the second air entries;13: exhaust outlet;
2: control valve;21: the first valve ports;22: the second valve ports;23: the three valve ports;24: the four valve ports;
3: First Heat Exchanger;4: the second heat exchangers;
5: gas-liquid separator;6: the first electric expansion valves;7: the second electric expansion valves.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish phase Same or similar label represents same or similar element or has the element of same or like function.Below with reference to The embodiment that accompanying drawing describes is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", On " ", D score, "left", "right", " vertically ", " level ", " interior ", the instruction such as " outward " Orientation or position relationship are based on orientation shown in the drawings or position relationship, are for only for ease of the description present invention and simplification Describe rather than indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration And operation, therefore it is not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or imply relatively heavy The property wanted or the implicit quantity indicating indicated technical characteristic.Thus, " first ", the spy of " second " are defined Levy and can express or implicitly include one or more this feature.In describing the invention, unless otherwise saying Bright, " multiple " are meant that two or more.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " install ", " be connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, Or be integrally connected;Can be to be mechanically connected, it is also possible to be electrical connection;Can be to be joined directly together, it is also possible in by Between medium be indirectly connected to, can be the connection of two element internals.For the ordinary skill in the art, may be used Above-mentioned term concrete meaning in the present invention is understood with concrete condition.
Control method below with reference to Fig. 1 and Fig. 2 description frequency-conversion air-conditioning system 100 according to embodiments of the present invention.
As depicted in figs. 1 and 2, the control method of the frequency-conversion air-conditioning system 100 of embodiment according to a first aspect of the present invention, Including freezing and heating the two kinds of control methods run under both of which individually below.
Wherein, frequency-conversion air-conditioning system 100 includes that compressor 1, first order electric expansion valve, flow direction along refrigerant exist Thereafter second level electric expansion valve.Here, " first order electric expansion valve ", " second level electric expansion valve " can To be interpreted as: no matter frequency-conversion air-conditioning system 100 refrigerating operaton or heating operation, circulation in frequency-conversion air-conditioning system 100 The refrigerant of flowing the most first flows through first order electric expansion valve, passes through second level electric expansion valve.
Specifically, when frequency-conversion air-conditioning system 100 refrigerating operaton, the control method of frequency-conversion air-conditioning system 100 include with Lower step:
Detection outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor
According to Toutdoor、TindoorCalculate refrigeration temperature difference △ Tcool=Toutdoor-Tindoor
The rotating speed M of detection compressor 1;
According to above-mentioned refrigeration temperature difference △ TcoolThe refrigeration valve controlling first order electric expansion valve with the rotating speed M of compressor 1 is opened Degree.
When frequency-conversion air-conditioning system 100 heating operation, the control method of frequency-conversion air-conditioning system 100 comprises the following steps:
Detection outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor
According to Toutdoor、TindoorCalculating heats temperature difference △ Theat=Tindoor-Toutdoor
The rotating speed N of detection compressor 1;
Temperature difference △ T is heated according to above-mentionedheatThe valve that heats controlling first order electric expansion valve with the rotating speed N of compressor 1 is opened Degree.
Under refrigeration or heating mode, second level electric expansion valve can automatically control according to present mode.Such as, Second level electric expansion valve can automatically control according to the evaporator superheat of frequency-conversion air-conditioning system 100, i.e. liquid Gaseous state is the most all flashed to when refrigerant flows through the outlet of evaporimeter.It is, of course, also possible to carry out according to suction superheat etc. Control.
The control method of frequency-conversion air-conditioning system 100 according to embodiments of the present invention, by using above-mentioned control method to change Frequently air-conditioning system 100 is controlled, and controls simple.
According to some embodiments of the present invention, the gear C of the refrigeration valve aperture of first order electric expansion valve meets:
C=A+B-1
Wherein, A is refrigeration temperature difference △ TcoolThe gear of the corresponding refrigeration temperature difference, B is that the rotating speed M of compressor 1 is corresponding The gear of refrigeration compressor 1 rotating speed, A, B, C be positive integer, and the gear number of the refrigeration temperature difference and refrigeration compressor The gear number of 1 rotating speed is all higher than equal to 2, and now the refrigeration valve aperture of first order electric expansion valve is corresponding to first order electricity The gear C of the refrigeration valve aperture of sub-expansion valve.
Specifically, the gear A of the actual refrigeration temperature difference needs the refrigeration temperature difference △ T obtained according to Practical CalculationcoolDetermine, For example, it is possible to pre-set the refrigeration temperature difference to have acoolIndividual gear, is followed successively by the 1st grade of refrigeration temperature difference the most respectively, The 2nd grade of refrigeration temperature difference ..., acoolThe shelves refrigeration temperature difference.Similarly, the gear B of actual refrigeration compressor 1 rotating speed Can also determine according to actual speed M of the compressor 1 detected, such as, pre-set compressor 1 rotating speed altogether There is bcoolIndividual gear, be followed successively by the most respectively the 1st grade refrigeration rotating speed, the 2nd grade refrigeration rotating speed ..., bcool Shelves refrigeration rotating speed.
The refrigeration valve aperture of first order electric expansion valve can be pre-arranged ccoolIndividual gear, valve opening is distinguished from small to large It is followed successively by the 1st grade of refrigeration valve aperture, the 2nd grade of refrigeration valve aperture ..., ccoolShelves refrigeration valve aperture.The first order The refrigeration valve aperture that each gear of electric expansion valve is corresponding can be debugged in advance according to concrete frequency-conversion air-conditioning system 100 Go out, and ccool=acool+bcool-1。
The gear C of the refrigeration valve aperture of first order electric expansion valve can be according to the refrigeration temperature difference △ T detectedcoolAnd compression Machine 1 rotating speed N determines, as the refrigeration temperature difference △ T detectedcoolCorresponding A shelves and the compressor 1 rotating speed M detected During corresponding B shelves, then the gear C=A+B-1 of the refrigeration valve aperture of first order electric expansion valve, thus first order electronics The corresponding C shelves refrigeration valve aperture of the valve opening of expansion valve.
Such as, the gear A of the refrigeration temperature difference can specifically include:
As △ TcoolDuring <-10 DEG C, A=1;
As-10 DEG C≤△ TcoolDuring <-5 DEG C, A=2;
As-5 DEG C≤△ TcoolDuring < 5 DEG C, A=3;
As △ TcoolWhen >=5 DEG C, A=4.
It is to say, when according to the T detectedoutdoor、TindoorCalculated refrigeration temperature difference △ TcoolDuring <-10 DEG C, system The gear at cold temperature difference place is the 1st grade;As the refrigeration temperature difference-10 DEG C≤△ TcoolDuring <-5 DEG C, the shelves at refrigeration temperature difference place Position is the 2nd grade;As the refrigeration temperature difference-5 DEG C≤△ TcoolDuring < 5 DEG C, the gear at refrigeration temperature difference place is the 3rd grade;Work as system Cold temperature difference △ TcoolWhen >=5 DEG C, the gear at refrigeration temperature difference place is the 4th grade.Wherein, Toutdoor、TindoorCan respectively by Outdoor temperature sensor and indoor temperature transmitter detection obtain.
The gear B of refrigeration compressor 1 rotating speed can specifically include:
As M >=70Hz, B=1;
As M < 70Hz, B=2.
It is to say, as the rotating speed M >=70Hz of the compressor 1 detected, the gear at refrigeration compressor 1 rotating speed place It it is the 1st grade;As the rotating speed M < 70Hz of the compressor 1 detected, the gear at refrigeration compressor 1 rotating speed place is 2nd grade.
The refrigeration valve aperture of first order electric expansion valve is V1, the gear C of the refrigeration valve aperture of first order electric expansion valve Specifically include:
As C=1, V1=100 steps;
As C=2, V1=150 steps;
As C=3, V1=200 steps;
As C=4, V1=300 steps;
As C=5, V1=400 steps.
It is to say, valve opening V of first order electric expansion valve corresponding to the 1st grade of refrigeration valve aperture1It is 100 steps, the 2nd Valve opening V of the first order electric expansion valve that shelves refrigeration valve aperture is corresponding1Being 150 steps, the 3rd grade of refrigeration valve aperture is corresponding Valve opening V of first order electric expansion valve1It is 200 steps, the first order electronic expansion that the 4th grade of refrigeration valve aperture is corresponding Valve opening V of valve1It is 300 steps, valve opening V of the first order electric expansion valve that the 5th grade of refrigeration valve aperture is corresponding1It is 400 Step.
A specific embodiment according to the present invention, in the case of frequency-conversion air-conditioning system 100 refrigerating operaton, when refrigeration temperature Difference △ TcoolCorresponding 2nd grade and detect corresponding 1st grade of compressor 1 rotating speed M time, then first order electric expansion valve Refrigeration valve aperture gear C=2+1-1=2, thus the valve opening of first order electric expansion valve is opened corresponding to the 2nd grade of refrigeration valve Degree, i.e. valve opening V of first order electric expansion valve1It is 150 steps.
As refrigeration temperature difference △ TcoolCorresponding 3rd grade and detect corresponding 1st grade of compressor 1 rotating speed M time, then the first order The refrigeration valve aperture gear C=3+1-1=3 of electric expansion valve, then the valve opening of first order electric expansion valve corresponds to the 3rd Shelves refrigeration valve aperture, i.e. valve opening V of first order electric expansion valve1It is 200 steps.
As refrigeration temperature difference △ TcoolCorresponding 4th grade and detect corresponding 1st grade of compressor 1 rotating speed M time, then the first order The refrigeration valve aperture gear C=4+1-1=4 of electric expansion valve, then the valve opening of first order electric expansion valve corresponds to the 4th Shelves refrigeration valve aperture, then valve opening V of first order electric expansion valve1It is 300 steps.
When described refrigeration temperature difference △ T being detectedcoolCorresponding 4th grade and corresponding 2nd grade of described compressor 1 rotating speed M detected Time, the refrigeration valve aperture gear C=4+2-1=5 of the most described first order electric expansion valve, the most described first order electronic expansion The valve opening of valve corresponds to the 5th grade of refrigeration valve aperture, then valve opening V of first order electric expansion valve1It is 400 steps.
According to some embodiments of the present invention, the gear F heating valve opening of first order electric expansion valve meets:
F=D+E-1
Wherein, D is the gear heating the temperature difference, and E is the gear heating compressor 1 rotating speed, and D, E, F are positive integer, And the gear number heating the temperature difference is all higher than equal to 2 with the gear number heating compressor 1 rotating speed, first order electronic expansion The valve opening that heats of valve corresponds to the gear F heating valve opening of first order electric expansion valve.
Specifically, the actual gear D heating the temperature difference needs to heat temperature difference △ T according to what Practical Calculation obtainedheatDetermine, Heat the temperature difference have a for example, it is possible to pre-setheatIndividual gear, is followed successively by the 1st grade the most respectively and heats the temperature difference, 2nd grade heats the temperature difference ..., aheatShelves heat the temperature difference.Similarly, the gear E of actual refrigeration compressor 1 rotating speed Can also determine according to actual speed N of the compressor 1 detected, such as, pre-set compressor 1 rotating speed altogether There is bheatIndividual gear, is followed successively by the 1st grade the most respectively and heats rotating speed, and the 2nd grade heats rotating speed ..., bheat Shelves heat rotating speed.
The refrigeration valve aperture of first order electric expansion valve can be pre-arranged cheatIndividual gear, valve opening is distinguished from small to large Being followed successively by the 1st grade and heat valve opening, the 2nd grade of valve heats aperture ..., cheatShelves heat valve opening.The first order The valve opening that heats that each gear of electric expansion valve is corresponding is debugged out in advance according to concrete frequency-conversion air-conditioning system 100, And cheat=aheat+bheat-1。
The gear F heating valve opening of first order electric expansion valve can heat temperature difference △ T according to detectheatAnd compression Machine 1 rotating speed N determines, heats temperature difference △ T when detectheatCorresponding D shelves and compressor 1 rotating speed N pair detected When answering E shelves, then the gear F=D+E-1 heating valve opening of first order electric expansion valve, thus first order electronics is swollen The corresponding F shelves of the valve opening of swollen valve heat valve opening.
Such as, the gear D heating the temperature difference specifically includes:
As △ TheatDuring <-15 DEG C, D=1;
As-15 DEG C≤△ TheatDuring <-8 DEG C, D=2;
As-8 DEG C≤△ TheatDuring < 8 DEG C, D=3;
As △ TheatWhen >=8 DEG C, D=4.
It is to say, when according to the T detectedoutdoor、TindoorCalculated heat temperature difference △ TheatDuring <-15 DEG C, system The gear at hot temperature difference place is the 1st grade;When heating the temperature difference-15 DEG C≤△ TheatDuring <-8 DEG C, heat the shelves at temperature difference place Position is the 2nd grade;When heating the temperature difference-8 DEG C≤△ TheatDuring < 8 DEG C, the gear heating temperature difference place is the 3rd grade;Work as system Hot temperature difference △ TheatWhen >=8 DEG C, the gear heating temperature difference place is the 4th grade.
According to some embodiments of the present invention, the gear E heating compressor 1 rotating speed specifically includes:
As N >=60Hz, E=1;
As N < 60Hz, E=2.
It is to say, as the rotating speed N >=60Hz of the compressor 1 detected, heat the gear at compressor 1 rotating speed place It it is the 1st grade;As the rotating speed N < 60Hz of the compressor 1 detected, the gear heating compressor 1 rotating speed place is 2nd grade.
The valve opening that heats of first order electric expansion valve is V2, the gear F heating valve opening of first order electric expansion valve Specifically include:
As F=1, V2=80 steps;
As F=2, V2=120 steps;
As F=3, V2=180 steps;
As F=4, V2=250 steps;
As F=5, V2=300 steps.
It is to say, the 1st grade heat first order electric expansion valve corresponding to valve opening heat valve opening V2It is 80 steps, 2nd grade heat first order electric expansion valve corresponding to valve opening heat valve opening V2Being 120 steps, the 3rd grade heats valve The first order electric expansion valve that aperture is corresponding heat valve opening V2It is 180 steps, the 4th grade of heat that valve opening is corresponding the th One-level electric expansion valve heat valve opening V2Being 250 steps, the 5th grade heats the first order electronic expansion that valve opening is corresponding Valve heat valve opening V2It is 300 steps.
A specific embodiment according to the present invention, in the case of frequency-conversion air-conditioning system 100 heating operation, when heating temperature Difference △ TheatCorresponding 1st grade and detect corresponding 1st grade of compressor 1 rotating speed N time, then first order electric expansion valve Heat valve opening gear F=1+1-1=1, thus the valve opening that heats of first order electric expansion valve heats corresponding to the 1st grade Valve opening, i.e. first order electric expansion valve heat valve opening V2It is 80 steps.
When heating temperature difference △ TheatCorresponding 2nd grade and detect corresponding 1st grade of compressor 1 rotating speed N time, then the first order Electric expansion valve heat valve opening gear F=2+1-1=2, thus first order electric expansion valve to heat valve opening corresponding Heat valve opening in the 2nd grade, i.e. first order electric expansion valve heat valve opening V2It is 120 steps.
When heating temperature difference △ TheatCorresponding 3rd grade and detect corresponding 1st grade of compressor 1 rotating speed N time, then the first order Electric expansion valve heat valve opening gear F=3+1-1=3, thus first order electric expansion valve to heat valve opening corresponding Heat valve opening in the 3rd grade, i.e. first order electric expansion valve heat valve opening V2It is 180 steps.
When heating temperature difference △ TheatCorresponding 4th grade and detect corresponding 1st grade of compressor 1 rotating speed N time, then the first order Electric expansion valve heat valve opening gear F=4+1-1=4, thus first order electric expansion valve to heat valve opening corresponding Heat valve opening in the 4th grade, i.e. first order electric expansion valve heat valve opening V2It is 250 steps.
When heating temperature difference △ TheatCorrespondence the 4th grade and corresponding 2nd grade of the compressor 1 rotating speed N detected, then first order electricity Sub-expansion valve heat valve opening gear F=4+2-1=5, thus the valve opening that heats of first order electric expansion valve corresponds to 5th grade heats valve opening, i.e. first order electric expansion valve heat valve opening V2It is 300 steps.
According to some embodiments of the present invention, outdoor environment temperature can be the temperature of outdoor heat exchanger, and such as, outdoor is changed The temperature of hot device is the saturation temperature being converted into by the saturation pressure of outdoor heat exchanger, but is not limited to this.
According to some embodiments of the present invention, indoor environment temperature can be the temperature of indoor heat exchanger, and such as, indoor are changed The temperature of hot device is the saturation temperature being converted into by the saturation pressure of indoor heat exchanger, but is not limited to this.
As depicted in figs. 1 and 2, the frequency-conversion air-conditioning system 100 of embodiment according to a second aspect of the present invention, including compressor 1, control valve 2, First Heat Exchanger 3 (i.e. outdoor heat exchanger), the second heat exchanger 4 (i.e. indoor heat exchanger), gas-liquid Separator the 5, first electric expansion valve 6 and the second electric expansion valve 7.Wherein, frequency-conversion air-conditioning system 100 can be adopted It is controlled with according to the control method of the present invention above-mentioned first aspect embodiment.
Seeing figures.1.and.2, compressor 1 can include the first cylinder and the second cylinder, and the first cylinder has the first air-breathing Mouth 11, the second cylinder has the second air entry 12, and compressor 1 has exhaust outlet 13.Control valve 2 includes the first valve port 21, the first valve port the 21, the 3rd valve port 23 and the 4th valve port 24, the first valve port 21 is connected with exhaust outlet 13, and the 3rd Valve port 23 is connected with the first air entry 11.One end (such as, the left end in Fig. 1) and the 4th of First Heat Exchanger 3 Valve port 24 is connected.One end (such as, the left end in Fig. 1) of second heat exchanger 4 is connected with the second valve port 22.Gas Liquid/gas separator 5 has the first connector, the second connector and outlet, and outlet is connected with the second air entry 12.First electricity One end (such as, the upper end in Fig. 1) of sub-expansion valve 6 and the other end of First Heat Exchanger 3 are (such as, in Fig. 1 Right-hand member) be connected, the other end (such as, the lower end in Fig. 1) and the first connector phase of the first electric expansion valve 6 Even.One end (such as, the left end in Fig. 1) of second electric expansion valve 7 and the other end (example of the second heat exchanger 4 Such as, the right-hand member in Fig. 1) it is connected, the other end (such as, the right-hand member in Fig. 1) of the second electric expansion valve 7 and the Two connectors are connected.Alternatively, control valve 2 is cross valve, but is not limited to this.
When frequency-conversion air-conditioning system 100 refrigerating operaton, the first electric expansion valve 6 is first order electric expansion valve and second Electric expansion valve 7 is second level electric expansion valve;When frequency-conversion air-conditioning system 100 heating operation, the second electronic expansion Valve 7 is first order electric expansion valve and the first electric expansion valve 6 is second level electric expansion valve.
Frequency-conversion air-conditioning system 100 according to embodiments of the present invention, by using above-mentioned control method, it is possible to use frequency conversion The existing indoor temperature transmitter of air-conditioning system 100, outdoor temperature sensor and compressor 1 rotating speed that detects are to One-level electric expansion valve is controlled, without arranging detection flasher temperature or the sensor of pressure, the second cylinder temperature Degree or the sensor etc. of pressure, control simple, and, the control of second level electric expansion valve still can be according to existing Technology (as controlled evaporator superheat, suction superheat etc.) is controlled, and easily promotes.
Other of frequency-conversion air-conditioning system 100 according to embodiments of the present invention constitute and operate for ordinary skill It is all known for personnel, is not detailed herein.
In the description of this specification, reference term " embodiment ", " some embodiments ", " illustrative examples ", It is concrete that the description of " example ", " concrete example " or " some examples " etc. means to combine this embodiment or example describes Feature, structure, material or feature are contained at least one embodiment or the example of the present invention.In this manual, right The schematic representation of above-mentioned term is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, Material or feature can combine in any one or more embodiments or example in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: do not taking off In the case of the principles and objective of the present invention, these embodiments can be carried out multiple change, revise, replace and modification, The scope of the present invention is limited by claim and equivalent thereof.

Claims (14)

1. the control method of a frequency-conversion air-conditioning system, it is characterised in that described frequency-conversion air-conditioning system include compressor, First order electric expansion valve, flow direction second level electric expansion valve behind along refrigerant,
When described frequency-conversion air-conditioning system refrigerating operaton, described control method comprises the following steps:
Detection outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor
According to Toutdoor、TindoorCalculate refrigeration temperature difference △ Tcool=Toutdoor-Tindoor
Detect the rotating speed M of described compressor;
According to described refrigeration temperature difference △ TcoolWith the system that the rotating speed M of described compressor controls described first order electric expansion valve Low temperature valve aperture;
When described frequency-conversion air-conditioning system heating operation, described control method comprises the following steps:
Detection outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor
According to Toutdoor、TindoorCalculating heats temperature difference △ Theat=Tindoor-Toutdoor
Detect the rotating speed N of described compressor;
Temperature difference △ T is heated according to describedheatWith the system that the rotating speed N of described compressor controls described first order electric expansion valve Thermal valve aperture.
The control method of frequency-conversion air-conditioning system the most according to claim 1, it is characterised in that described first order electricity The gear C of the refrigeration valve aperture of sub-expansion valve meets:
C=A+B-1
Wherein, described A is described refrigeration temperature difference △ TcoolThe gear of the corresponding refrigeration temperature difference, described B is described rotating speed M The gear of corresponding refrigeration compressor rotating speed, described A, B, C are positive integer, and the gear of the described refrigeration temperature difference The gear number of number and described refrigeration compressor rotating speed is all higher than equal to 2,
The refrigeration valve aperture of described first order electric expansion valve is corresponding to the refrigeration valve aperture of described first order electric expansion valve Gear C.
The control method of frequency-conversion air-conditioning system the most according to claim 2, it is characterised in that the described refrigeration temperature difference Gear A specifically include:
As △ TcoolDuring <-10 DEG C, A=1;
As-10 DEG C≤△ TcoolDuring <-5 DEG C, A=2;
As-5 DEG C≤△ TcoolDuring < 5 DEG C, A=3;
As △ TcoolWhen >=5 DEG C, A=4.
The control method of frequency-conversion air-conditioning system the most according to claim 2, it is characterised in that described refrigerant compression The gear B of machine rotating speed specifically includes:
As M >=70Hz, B=1;
As M < 70Hz, B=2.
The control method of frequency-conversion air-conditioning system the most according to claim 2, it is characterised in that described first order electricity The refrigeration valve aperture of sub-expansion valve is V1,
The gear C of the refrigeration valve aperture of described first order electric expansion valve specifically includes:
As C=1, described V1=100 steps;
As C=2, described V1=150 steps;
As C=3, described V1=200 steps;
As C=4, described V1=300 steps;
As C=5, described V1=400 steps.
6. according to the control method of the frequency-conversion air-conditioning system according to any one of claim 1-5, it is characterised in that institute The gear F heating valve opening stating first order electric expansion valve meets:
F=D+E-1
Wherein, described D is for heating temperature difference △ TheatThe corresponding gear heating the temperature difference, described E is that described rotating speed N is corresponding The gear heating compressor rotary speed, described D, E, F be positive integer, and described in heat the temperature difference gear number and The described gear number heating compressor rotary speed is all higher than equal to 2,
Described first order electric expansion valve heat valve opening corresponding to described first order electric expansion valve heat valve opening Gear F.
The control method of frequency-conversion air-conditioning system the most according to claim 6, it is characterised in that described in heat the temperature difference Gear D specifically include:
As △ TheatDuring <-15 DEG C, D=1;
As-15 DEG C≤△ TheatDuring <-8 DEG C, D=2;
As-8 DEG C≤△ TheatDuring < 8 DEG C, D=3;
As △ TheatWhen >=8 DEG C, D=4.
The control method of frequency-conversion air-conditioning system the most according to claim 6, it is characterised in that described in heat compression The gear E of machine rotating speed specifically includes:
As N >=60Hz, E=1;
As N < 60Hz, E=2.
The control method of frequency-conversion air-conditioning system the most according to claim 6, it is characterised in that described first order electricity The valve opening that heats of sub-expansion valve is V2,
The gear F heating valve opening of described first order electric expansion valve specifically includes:
As F=1, described V2=80 steps;
As F=2, described V2=120 steps;
As F=3, described V2=180 steps;
As F=4, described V2=250 steps;
As F=5, described V2=300 steps.
The control method of frequency-conversion air-conditioning system the most according to claim 1, it is characterised in that described outdoor environment Temperature is the temperature of outdoor heat exchanger.
The control method of 11. frequency-conversion air-conditioning systems according to claim 10, it is characterised in that described outdoor is changed The temperature of hot device is the saturation temperature being converted into by the saturation pressure of described outdoor heat exchanger.
The control method of 12. frequency-conversion air-conditioning systems according to claim 1, it is characterised in that described indoor environment Temperature is the temperature of indoor heat exchanger.
The control method of 13. frequency-conversion air-conditioning systems according to claim 12, it is characterised in that described indoor are changed The temperature of hot device is the saturation temperature being converted into by the saturation pressure of described indoor heat exchanger.
The convertible frequency air-conditioner of the control method of 14. 1 kinds of frequency-conversion air-conditioning systems used according to any one of claim 1-13 System, it is characterised in that including:
Compressor, described compressor includes that the first cylinder and the second cylinder, described first cylinder have the first air entry, institute Stating the second cylinder and have the second air entry, described compressor has exhaust outlet;
Control valve, described control valve includes that the first valve port to the 4th valve port, described first valve port are connected with described exhaust outlet, 3rd valve port and the first air entry are connected;
First Heat Exchanger, one end of described First Heat Exchanger is connected with described 4th valve port;
Second heat exchanger, one end of described second heat exchanger is connected with the second valve port;
Gas-liquid separator, described gas-liquid separator has the first connector, the second connector and outlet, described outlet and institute State the second air entry to be connected;
First electric expansion valve, one end of described first electric expansion valve is connected with the other end of described First Heat Exchanger, institute The other end stating the first electric expansion valve is connected with described first connector;And
Second electric expansion valve, one end of described second electric expansion valve is connected with the other end of described second heat exchanger, institute The other end stating the second electric expansion valve is connected with described second connector,
When described frequency-conversion air-conditioning system refrigerating operaton, described first electric expansion valve be described first order electric expansion valve and Described second electric expansion valve is described second level electric expansion valve, when described frequency-conversion air-conditioning system heating operation, and institute State the second electric expansion valve and be described first order electric expansion valve and described first electric expansion valve is described second level electronics Expansion valve.
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CN106352585A (en) * 2016-09-29 2017-01-25 广东美的制冷设备有限公司 Air-conditioning system and control method thereof
CN106468487A (en) * 2016-09-29 2017-03-01 广东美的制冷设备有限公司 Air conditioning system and its control method
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CN106247652A (en) * 2016-09-29 2016-12-21 广东美的制冷设备有限公司 Air conditioning system and control method thereof
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