CN105864972B - Frequency-conversion air-conditioning system and its control method - Google Patents

Frequency-conversion air-conditioning system and its control method Download PDF

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Publication number
CN105864972B
CN105864972B CN201610231631.3A CN201610231631A CN105864972B CN 105864972 B CN105864972 B CN 105864972B CN 201610231631 A CN201610231631 A CN 201610231631A CN 105864972 B CN105864972 B CN 105864972B
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CN
China
Prior art keywords
electric expansion
expansion valve
valve
frequency
heating
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CN201610231631.3A
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CN105864972A (en
Inventor
陈海群
廖四清
曾令华
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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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Priority to CN201610231631.3A priority Critical patent/CN105864972B/en
Publication of CN105864972A publication Critical patent/CN105864972A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B49/022—Compressor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a kind of frequency-conversion air-conditioning system and its control methods, frequency-conversion air-conditioning system includes compressor, first order electric expansion valve, the second level electric expansion valve along the flow direction of refrigerant behind, when refrigerating operaton, control method is the following steps are included: detection outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor；According to Toutdoor、TindoorCalculate refrigeration temperature difference △ Tcool=Toutdoor‑Tindoor；Detect the revolving speed M of compressor；According to △ TcoolThe refrigeration valve opening of first order electric expansion valve is controlled with revolving speed M；When heating operation, control method is the following steps are included: detection outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor；According to Toutdoor、TindoorCalculate heating temperature difference △ Theat=Tindoor‑Toutdoor；Detect the revolving speed N of compressor；According to △ TheatThe heating valve opening of first order electric expansion valve is controlled with revolving speed N.The control method of frequency-conversion air-conditioning system according to the present invention, control are simple.

Description

Frequency-conversion air-conditioning system and its control method
Technical field
The present invention relates to air-conditioning technical fields, more particularly, to a kind of frequency-conversion air-conditioning system and its control method.
Background technique
In the related technology, for using coolant injection formula compressor frequency-conversion air-conditioning system, coolant injection formula compressor First cylinder absorbs the refrigerant for carrying out flash-pot, and the second cylinder then absorbs the refrigerant from gas-liquid separator, if using two The control for the electric expansion valve that the first order throttles when a expansion valve is controlled can extremely complex and to first order throttling electronics Expansion valve needs to increase sensor when controlling, for example, it is desired to the sensor of flasher temperature or pressure is detected, the second temperature cylinder Or sensor of pressure etc..
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, one object of the present invention It is to propose a kind of control method of frequency-conversion air-conditioning system, control is simple.
It is another object of the present invention to propose a kind of frequency-conversion air-conditioning system using above-mentioned control method.
The control method of frequency-conversion air-conditioning system according to a first aspect of the present invention, the frequency-conversion air-conditioning system include compression Machine, first order electric expansion valve, the second level electric expansion valve along the flow direction of refrigerant behind, when the convertible frequency air-conditioner system When controlling cold operation, the control method is the following steps are included: detection outdoor environment temperature ToutdoorAnd indoor environment temperature Tindoor；According to Toutdoor、TindoorCalculate refrigeration temperature difference △ Tcool=Toutdoor-Tindoor；Detect the revolving speed M of the compressor； According to the refrigeration temperature difference △ TcoolIt is opened with the revolving speed M of the compressor to control the refrigeration valve of the first order electric expansion valve Degree；
When the frequency-conversion air-conditioning system heating operation, the control method is the following steps are included: detection outdoor environment temperature Spend ToutdoorWith indoor environment temperature Tindoor；According to Toutdoor、TindoorCalculate heating temperature difference △ Theat=Tindoor-Toutdoor； Detect the revolving speed N of the compressor；According to the heating temperature difference △ TheatDescribed first is controlled with the revolving speed N of the compressor The heating valve opening of grade electric expansion valve.
The control method of frequency-conversion air-conditioning system according to the present invention, by using above-mentioned control method to convertible frequency air-conditioner system System is controlled, and control is simple.
According to some embodiments of the present invention, the gear C of the refrigeration valve opening of the first order electric expansion valve meets: C =A+B-1, wherein the A is the refrigeration temperature difference △ TcoolThe gear of the corresponding refrigeration temperature difference, the B are M pairs of the revolving speed The gear for the refrigeration compressor revolving speed answered, described A, B, C are positive integer, and the gear number and the system of the refrigeration temperature difference The gear number of cold compressor revolving speed is all larger than equal to 2, and the refrigeration valve opening of the first order electric expansion valve corresponds to described The gear C of the refrigeration valve opening of first order electric expansion valve.
Specifically, the gear A of the refrigeration temperature difference is specifically included: as △ TcoolAt < -10 DEG C, A=1；As -10 DEG C≤△ TcoolAt < -5 DEG C, A=2；As -5 DEG C≤△ TcoolAt 5 DEG C of <, A=3；As △ TcoolAt >=5 DEG C, A=4.
Specifically, the gear B of the refrigeration compressor revolving speed is specifically included: as M >=70Hz, B=1；As M < 70Hz When, B=2.
Specifically, the refrigeration valve opening of the first order electric expansion valve is V1, the system of the first order electric expansion valve The gear C of low temperature valve aperture is specifically included: as C=1, the V1=100 steps；As C=2, the V1=150 steps；Work as C=3 When, the V1=200 steps；As C=4, the V1=300 steps；As C=5, the V1=400 steps.
According to some embodiments of the present invention, the gear F of the heating valve opening of the first order electric expansion valve meets: F =D+E-1, wherein the D is heating temperature difference △ TheatThe gear of the corresponding heating temperature difference, the E are that the revolving speed N is corresponding The gear of compressor rotary speed is heated, described D, E, F are positive integer, and the gear number of the heating temperature difference and the heating are pressed The gear number of contracting machine revolving speed is all larger than equal to 2, and the heating valve opening of the first order electric expansion valve corresponds to described first The gear F of the heating valve opening of grade electric expansion valve.
Specifically, the gear D of the heating temperature difference is specifically included: as △ TheatAt < -15 DEG C, D=1；As -15 DEG C≤△ TheatAt < -8 DEG C, D=2；As -8 DEG C≤△ TheatAt 8 DEG C of <, D=3；As △ TheatAt >=8 DEG C, D=4.
Specifically, the gear E of the heating compressor rotary speed is specifically included: as N >=60Hz, E=1；As N < 60Hz When, E=2.
Specifically, the heating valve opening of the first order electric expansion valve is V2, the system of the first order electric expansion valve The gear F of thermal valve aperture is specifically included: as F=1, the V2=80 steps；As F=2, the V2=120 steps；As F=3, The V2=180 steps；As F=4, the V2=250 steps；As F=5, the V2=300 steps.
According to some embodiments of the present invention, the outdoor environment temperature is the temperature of outdoor heat exchanger.
Optionally, the temperature of the outdoor heat exchanger is the saturation temperature being converted by the saturation pressure of the outdoor heat exchanger Degree.
According to some embodiments of the present invention, the indoor environment temperature is the temperature of indoor heat exchanger.
Optionally, the temperature of the indoor heat exchanger is the saturation temperature being converted by the saturation pressure of the indoor heat exchanger Degree.
The controlling party using the frequency-conversion air-conditioning system of above-mentioned first aspect according to the present invention according to a second aspect of the present invention The frequency-conversion air-conditioning system of method, comprising: compressor, the compressor include the first cylinder and the second cylinder, the first cylinder tool There is the first air entry, second cylinder has the second air entry, and the compressor has exhaust outlet；Control valve, the control Valve includes the first valve port to the 4th valve port, and first valve port is connected with the exhaust outlet, third valve port and the first air entry phase Even；First Heat Exchanger, one end of the First Heat Exchanger are connected with the 4th valve port；Second heat exchanger, second heat exchange One end of device is connected with the second valve port；Gas-liquid separator, the gas-liquid separator have the first connector, the second connector and go out Mouthful, the outlet is connected with second air entry；First electric expansion valve, one end of first electric expansion valve with it is described The other end of First Heat Exchanger is connected, and the other end of first electric expansion valve is connected with first connector；And the Two electric expansion valves, one end of second electric expansion valve are connected with the other end of second heat exchanger, second electricity The other end of sub- expansion valve is connected with second connector, when the frequency-conversion air-conditioning system refrigerating operaton, first electricity Sub- expansion valve is the first order electric expansion valve and second electric expansion valve is the second level electric expansion valve, works as institute When stating frequency-conversion air-conditioning system heating operation, second electric expansion valve is the first order electric expansion valve and first electricity Sub- expansion valve is the second level electric expansion valve.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures Obviously and it is readily appreciated that, in which:
Schematic diagram when Fig. 1 is frequency-conversion air-conditioning system refrigerating operaton according to an embodiment of the present invention；
Schematic diagram when Fig. 2 is frequency-conversion air-conditioning system heating operation according to an embodiment of the present invention.
Appended drawing 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: third valve port；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.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", "upper", The orientation or positional relationship of the instructions such as "lower", "left", "right", "vertical", "horizontal", "inner", "outside" is based on the figure Orientation or positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning or Element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two It is a or more than two.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.
The control method of frequency-conversion air-conditioning system 100 according to an embodiment of the present invention is described below with reference to Fig. 1 and Fig. 2.
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, packet Include the two kinds of control methods run under refrigeration and heating both of which individually below.
Wherein, frequency-conversion air-conditioning system 100 is including compressor 1, first order electric expansion valve, along the flow direction of refrigerant at it Second level electric expansion valve afterwards.Here, " first order electric expansion valve ", " second level electric expansion valve " are it is to be understood that nothing By 100 refrigerating operaton of frequency-conversion air-conditioning system or heating operation, the refrigerant of 100 internal circulation flow of frequency-conversion air-conditioning system first flows always Through first order electric expansion valve, pass through second level electric expansion valve.
Specifically, when 100 refrigerating operaton of frequency-conversion air-conditioning system, the control method of frequency-conversion air-conditioning system 100 include with Lower step:
Detect outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor；
According to Toutdoor、TindoorCalculate refrigeration temperature difference △ Tcool=Toutdoor-Tindoor；
Detect the revolving speed M of compressor 1；
According to above-mentioned refrigeration temperature difference △ TcoolThe refrigeration valve of first order electric expansion valve is controlled with the revolving speed M of compressor 1 Aperture.
When 100 heating operation of frequency-conversion air-conditioning system, the control method of frequency-conversion air-conditioning system 100 the following steps are included:
Detect outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor；
According to Toutdoor、TindoorCalculate heating temperature difference △ Theat=Tindoor-Toutdoor；
Detect the revolving speed N of compressor 1；
According to above-mentioned heating temperature difference △ TheatThe heating valve of first order electric expansion valve is controlled with the revolving speed N of compressor 1 Aperture.
Under refrigeration or heating mode, second level electric expansion valve can be carried out automatically controlling according to present mode.For example, Second level electric expansion valve can be carried out automatically controlling according to the evaporator superheat of frequency-conversion air-conditioning system 100, i.e. liquid refrigerants Gaseous state is just all flashed to when flowing through the outlet of evaporator.It is, of course, also possible to be controlled according to suction superheat etc..
The control method of frequency-conversion air-conditioning system 100 according to an embodiment of the present invention, by using above-mentioned control method pair Frequency-conversion air-conditioning system 100 is controlled, and control is simple.
According to some embodiments of the present invention, the gear C of the refrigeration valve opening 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 are the corresponding system of revolving speed M of compressor 1 The gear of 1 revolving speed of cold compressor, A, B, C are positive integer, and the shelves of 1 revolving speed of gear number and refrigeration compressor for the temperature difference of freezing Position number is all larger than equal to 2, and the refrigeration valve opening of first order electric expansion valve corresponds to the system of first order electric expansion valve at this time The gear C of low temperature valve aperture.
Specifically, the gear A of the practical refrigeration temperature difference is needed according to the refrigeration temperature difference △ T being actually calculatedcoolCome true It is fixed, for example, can preset the refrigeration temperature difference shares acoolA gear is followed successively by the 1st grade of refrigeration temperature difference respectively from small to large, the 2 grades of refrigeration temperature difference ... ..., acoolThe shelves refrigeration temperature difference.Similarly, the gear B of practical 1 revolving speed of refrigeration compressor can also basis The actual speed M of the compressor 1 detected is determined, for example, presetting compressor 1 revolving speed shares bcoolA gear, from big It is followed successively by the 1st grade of refrigeration revolving speed, the 2nd grade of refrigeration revolving speed ... ..., b respectively to smallcoolShelves refrigeration revolving speed.
The refrigeration valve opening of first order electric expansion valve can be pre-arranged ccoolA gear, valve opening are divided from small to large It is not followed successively by the 1st grade of refrigeration valve opening, the 2nd grade of refrigeration valve opening ... ..., ccoolShelves refrigeration valve opening.First order electronics is swollen The corresponding refrigeration valve opening of each gear of swollen valve can debug out in advance according to specific frequency-conversion air-conditioning system 100, and ccool =acool+bcool-1。
The gear C of the refrigeration valve opening of first order electric expansion valve can be according to the refrigeration temperature difference △ T detectedcoolAnd pressure 1 revolving speed N of contracting machine is determined, as the refrigeration temperature difference △ T detectedcoolIt corresponds to A grades and the 1 revolving speed M of compressor detected is corresponding At B grades, then the gear C=A+B-1 of the refrigeration valve opening of first order electric expansion valve, thus the valve of first order electric expansion valve Aperture corresponds to C grades of refrigeration valve openings.
For example, the gear A of the refrigeration temperature difference can be specifically included:
As △ TcoolAt < -10 DEG C, A=1；
As -10 DEG C≤△ TcoolAt < -5 DEG C, A=2；
As -5 DEG C≤△ TcoolAt 5 DEG C of <, A=3；
As △ TcoolAt >=5 DEG C, A=4.
That is, when according to the T detectedoutdoor、TindoorThe refrigeration temperature difference △ T being calculatedcoolAt < -10 DEG C, Gear where the temperature difference of freezing is the 1st grade；As refrigeration -10 DEG C of the temperature difference≤△ TcoolGear at < -5 DEG C, where the temperature difference of freezing It is the 2nd grade；As refrigeration -5 DEG C of the temperature difference≤△ TcoolAt 5 DEG C of <, the gear where the temperature difference of freezing is the 3rd grade；As refrigeration temperature difference △ TcoolAt >=5 DEG C, the gear where the temperature difference of freezing is the 4th grade.Wherein, Toutdoor、TindoorIt can be sensed respectively by outdoor temperature Device and indoor temperature transmitter detect to obtain.
The gear B of 1 revolving speed of refrigeration compressor can be specifically included:
As M >=70Hz, B=1；
As M < 70Hz, B=2.
That is, as revolving speed M >=70Hz of the compressor 1 detected, the gear where 1 revolving speed of refrigeration compressor is 1st grade；As the revolving speed M < 70Hz of the compressor 1 detected, the gear where 1 revolving speed of refrigeration compressor is the 2nd grade.
The refrigeration valve opening of first order electric expansion valve is V1, the gear C of the refrigeration valve opening of first order electric expansion valve It specifically includes:
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.
That is, the valve opening V of the corresponding first order electric expansion valve of the 1st grade of refrigeration valve opening1For 100 steps, the 2nd grade The valve opening V of the corresponding first order electric expansion valve of valve opening of freezing1For 150 steps, the 3rd grade of corresponding first order of refrigeration valve opening The valve opening V of electric expansion valve1For 200 steps, the valve opening V of the corresponding first order electric expansion valve of the 4th grade of refrigeration valve opening1For 300 steps, the valve opening V of the corresponding first order electric expansion valve of the 5th grade of refrigeration valve opening1For 400 steps.
A specific embodiment according to the present invention, in the case where 100 refrigerating operaton of frequency-conversion air-conditioning system, when refrigeration temperature Poor △ TcoolCorresponding 2nd grade and the 1 revolving speed M of compressor that detects it is 1st grade corresponding when, then the refrigeration valve of first order electric expansion valve Aperture gear C=2+1-1=2, thus the valve opening of first order electric expansion valve correspond to the 2nd grade of refrigeration valve opening, i.e., first The valve opening V of grade electric expansion valve1For 150 steps.
As refrigeration temperature difference △ TcoolCorresponding 3rd grade and the 1 revolving speed M of compressor that detects it is 1st grade corresponding when, then first order electricity The refrigeration valve opening gear C=3+1-1=3 of sub- expansion valve, then the valve opening of first order electric expansion valve corresponds to the 3rd grade of refrigeration Valve opening, i.e. the valve opening V of first order electric expansion valve1For 200 steps.
As refrigeration temperature difference △ TcoolCorresponding 4th grade and the 1 revolving speed M of compressor that detects it is 1st grade corresponding when, then first order electricity The refrigeration valve opening gear C=4+1-1=4 of sub- expansion valve, then the valve opening of first order electric expansion valve corresponds to the 4th grade of refrigeration Valve opening, then the valve opening V of first order electric expansion valve1For 300 steps.
When detecting the refrigeration temperature difference △ TcoolIt corresponds to the 4th grade and detects that the 1 revolving speed M of compressor is 2nd grade corresponding When, then the refrigeration valve opening gear C=4+2-1=5 of the first order electric expansion valve, then the first order electric expansion valve Valve opening corresponds to the 5th grade of refrigeration valve opening, then the valve opening V of first order electric expansion valve1For 400 steps.
According to some embodiments of the present invention, the gear F of the heating valve opening of first order electric expansion valve meets:
F=D+E-1
Wherein, D is the gear for heating the temperature difference, and E is the gear for heating 1 revolving speed of compressor, and D, E, F are positive integer, and is made The gear number of the hot temperature difference and the gear number of heating 1 revolving speed of compressor are all larger than the heating of first order electric expansion valve equal to 2 Valve opening corresponds to the gear F of the heating valve opening of first order electric expansion valve.
Specifically, the gear D of the practical heating temperature difference is needed according to the heating temperature difference △ T being actually calculatedheatCome true It is fixed, for example, can preset the heating temperature difference shares aheatA gear is followed successively by the 1st grade of heating temperature difference respectively from small to large, the 2 grades of heating temperature difference ... ..., aheatThe shelves heating temperature difference.Similarly, the gear E of practical 1 revolving speed of refrigeration compressor can also basis The actual speed N of the compressor 1 detected is determined, for example, presetting compressor 1 revolving speed shares bheatA gear, from big It is followed successively by the 1st grade of heating revolving speed, the 2nd grade of heating revolving speed ... ..., b respectively to smallheatShelves heating revolving speed.
The refrigeration valve opening of first order electric expansion valve can be pre-arranged cheatA gear, valve opening are divided from small to large It is not followed successively by the 1st grade of heating valve opening, the 2nd grade of valve heats aperture ... ..., cheatShelves heating valve opening.First order electronics is swollen The corresponding heating valve opening of each gear of swollen valve is debugged out in advance according to specific frequency-conversion air-conditioning system 100, and cheat=aheat +bheat-1。
The gear F of the heating valve opening of first order electric expansion valve can be according to the heating temperature difference △ T detectedheatAnd pressure 1 revolving speed N of contracting machine is determined, as the heating temperature difference △ T detectedheatThe corresponding E of 1 revolving speed N of compressor for corresponding to D grades and detecting When shelves, then the gear F=D+E-1 of the heating valve opening of first order electric expansion valve, so that the valve of first order electric expansion valve is opened Spend corresponding F grades of heating valve openings.
For example, the gear D of the heating temperature difference is specifically included:
As △ TheatAt < -15 DEG C, D=1；
As -15 DEG C≤△ TheatAt < -8 DEG C, D=2；
As -8 DEG C≤△ TheatAt 8 DEG C of <, D=3；
As △ TheatAt >=8 DEG C, D=4.
That is, when according to the T detectedoutdoor、TindoorThe heating temperature difference △ T being calculatedheatAt < -15 DEG C, Gear where heating the temperature difference is the 1st grade；As heating -15 DEG C of the temperature difference≤△ TheatAt < -8 DEG C, the gear where the temperature difference is heated It is the 2nd grade；As heating -8 DEG C of the temperature difference≤△ TheatAt 8 DEG C of <, the gear where heating the temperature difference is the 3rd grade；As heating temperature difference △ TheatAt >=8 DEG C, the gear where heating the temperature difference is the 4th grade.
According to some embodiments of the present invention, the gear E for heating 1 revolving speed of compressor is specifically included:
As N >=60Hz, E=1；
As N < 60Hz, E=2.
That is, as revolving speed N >=60Hz of the compressor 1 detected, the gear where heating 1 revolving speed of compressor is 1st grade；As the revolving speed N < 60Hz of the compressor 1 detected, the gear where heating 1 revolving speed of compressor is the 2nd grade.
The heating valve opening of first order electric expansion valve is V2, the gear F of the heating valve opening of first order electric expansion valve It specifically includes:
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.
That is, the heating valve opening V of the corresponding first order electric expansion valve of the 1st grade of heating valve opening2For 80 steps, The heating valve opening V of the corresponding first order electric expansion valve of 2 grades of heating valve openings2For 120 steps, the 3rd grade of heating valve opening is corresponded to First order electric expansion valve heating valve opening V2For 180 steps, the 4th grade of corresponding first order electric expansion valve of heating valve opening Heating valve opening V2For 250 steps, the heating valve opening V of the corresponding first order electric expansion valve of the 5th grade of heating valve opening2It is 300 Step.
A specific embodiment according to the present invention, in the case where 100 heating operation of frequency-conversion air-conditioning system, when heating temperature Poor △ TheatCorresponding 1st grade and the 1 revolving speed N of compressor that detects it is 1st grade corresponding when, then the heating valve of first order electric expansion valve Aperture gear F=1+1-1=1, so that the heating valve opening of first order electric expansion valve corresponds to the 1st grade of heating valve opening, i.e., The heating valve opening V of first order electric expansion valve2For 80 steps.
As heating temperature difference △ TheatCorresponding 2nd grade and the 1 revolving speed N of compressor that detects it is 1st grade corresponding when, then first order electricity The heating valve opening gear F=2+1-1=2 of sub- expansion valve, so that the heating valve opening of first order electric expansion valve corresponds to the 2nd Shelves heating valve opening, i.e. the heating valve opening V of first order electric expansion valve2For 120 steps.
As heating temperature difference △ TheatCorresponding 3rd grade and the 1 revolving speed N of compressor that detects it is 1st grade corresponding when, then first order electricity The heating valve opening gear F=3+1-1=3 of sub- expansion valve, so that the heating valve opening of first order electric expansion valve corresponds to the 3rd Shelves heating valve opening, i.e. the heating valve opening V of first order electric expansion valve2For 180 steps.
As heating temperature difference △ TheatCorresponding 4th grade and the 1 revolving speed N of compressor that detects it is 1st grade corresponding when, then first order electricity The heating valve opening gear F=4+1-1=4 of sub- expansion valve, so that the heating valve opening of first order electric expansion valve corresponds to the 4th Shelves heating valve opening, i.e. the heating valve opening V of first order electric expansion valve2For 250 steps.
As heating temperature difference △ TheatIt corresponds to the 4th grade and the 1 revolving speed N of compressor detected is 2nd grade corresponding, then first order electronics The heating valve opening gear F=4+2-1=5 of expansion valve, so that the heating valve opening of first order electric expansion valve corresponds to the 5th grade Heat valve opening, i.e. the heating valve opening V of first order electric expansion valve2For 300 steps.
According to some embodiments of the present invention, outdoor environment temperature can be the temperature of outdoor heat exchanger, for example, outdoor is changed The temperature of hot device is the saturation temperature being converted by the saturation pressure of outdoor heat exchanger, but not limited to this.
According to some embodiments of the present invention, indoor environment temperature can be the temperature of indoor heat exchanger, for example, interior is changed The temperature of hot device is the saturation temperature being converted by the saturation pressure of indoor heat exchanger, but 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 5, first Electric expansion valve 6 and the second electric expansion valve 7.Wherein, frequency-conversion air-conditioning system 100 can be using according to the present invention above-mentioned first The control method of aspect embodiment is controlled.
Referring to Figures 1 and 2, compressor 1 may include the first cylinder and the second cylinder, and the first cylinder has the first air entry 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 Mouth 21, third valve port 23 and the 4th valve port 24, the first valve port 21 are connected with exhaust outlet 13, third valve port 23 and the first air entry 11 It is connected.One end (for example, left end in Fig. 1) of First Heat Exchanger 3 is connected with the 4th valve port 24.One end (example of second heat exchanger 4 Such as, the left end in Fig. 1) it is connected with the second valve port 22.Gas-liquid separator 5 has the first connector, the second connector and outlet, out Mouth is connected with the second air entry 12.One end (for example, upper end in Fig. 1) of first electric expansion valve 6 is another with First Heat Exchanger 3 One end (for example, right end in Fig. 1) is connected, and the other end (for example, lower end in Fig. 1) of the first electric expansion valve 6 connects with first Interface is connected.One end (for example, left end in Fig. 1) of second electric expansion valve 7 and the other end of the second heat exchanger 4 are (for example, figure Right end in 1) it is connected, the other end (for example, right end in Fig. 1) of the second electric expansion valve 7 is connected with the second connector.It is optional Ground, control valve 2 are four-way valve, but not limited to this.
When 100 refrigerating operaton of frequency-conversion air-conditioning system, 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 100 heating operation of frequency-conversion air-conditioning system, the second electric expansion valve 7 is the Level-one electric expansion valve and the first electric expansion valve 6 are second level electric expansion valve.
Frequency-conversion air-conditioning system 100 according to an embodiment of the present invention can use frequency conversion by using above-mentioned control method The existing indoor temperature transmitter of air-conditioning system 100, outdoor temperature sensor and 1 revolving speed of compressor detected are to first order electricity Sub- expansion valve is controlled, without the sensor for detecting flasher temperature or pressure, the second temperature cylinder or pressure is arranged Sensor etc., control is simple, moreover, the control of second level electric expansion valve still can be according to the prior art (as control is evaporated The device degree of superheat, suction superheat etc.) it is controlled, it is easy to promote.
Other of frequency-conversion air-conditioning system 100 according to an embodiment of the present invention are constituted and are operated for ordinary skill All be for personnel it is known, be not detailed herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ", The description of " example ", " specific example " or " some examples " etc. means specific features described in conjunction with this embodiment or example, knot Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description Point can be combined in any suitable manner in any one or more of the embodiments or examples.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this The range of invention is defined by the claims and their equivalents.

Claims (13)

1. a kind of control method of frequency-conversion air-conditioning system is it is characterized in that, the frequency-conversion air-conditioning system includes compressor, the first order Electric expansion valve, the second level electric expansion valve along the flow direction of refrigerant behind,
When the frequency-conversion air-conditioning system refrigerating operaton, the control method the following steps are included:
Detect outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor；
According to Toutdoor、TindoorCalculate refrigeration temperature difference △ Tcool=Toutdoor-Tindoor；
Detect the revolving speed M of the compressor；
According to the refrigeration temperature difference △ TcoolThe refrigeration of the first order electric expansion valve is controlled with the revolving speed M of the compressor The gear C of valve opening, the refrigeration valve opening of the first order electric expansion valve meets:
C=A+B-1
Wherein, the A is the refrigeration temperature difference △ TcoolThe gear of the corresponding refrigeration temperature difference, the B are that the revolving speed M is corresponding The gear of refrigeration compressor revolving speed, described A, B, C are positive integer, and the gear number of the refrigeration temperature difference and the refrigeration are pressed The gear number of contracting machine revolving speed is all larger than equal to 2,
The refrigeration valve opening of the first order electric expansion valve corresponds to the refrigeration valve opening of the first order electric expansion valve Gear C；
When the frequency-conversion air-conditioning system heating operation, the control method the following steps are included:
Detect outdoor environment temperature ToutdoorWith indoor environment temperature Tindoor；
According to Toutdoor、TindoorCalculate heating temperature difference △ Theat=Tindoor-Toutdoor；
Detect the revolving speed N of the compressor；
According to the heating temperature difference △ TheatThe heating of the first order electric expansion valve is controlled with the revolving speed N of the compressor Valve opening.
2. the control method of frequency-conversion air-conditioning system according to claim 1, which is characterized in that the gear of the refrigeration temperature difference A is specifically included:
As △ TcoolAt < -10 DEG C, A=1；
As -10 DEG C≤△ TcoolAt < -5 DEG C, A=2；
As -5 DEG C≤△ TcoolAt 5 DEG C of <, A=3；
As △ TcoolAt >=5 DEG C, A=4.
3. the control method of frequency-conversion air-conditioning system according to claim 1, which is characterized in that the refrigeration compressor revolving speed Gear B specifically include:
As M >=70Hz, B=1；
As M < 70Hz, B=2.
4. the control method of frequency-conversion air-conditioning system according to claim 1, which is characterized in that the first order electronic expansion The refrigeration valve opening of valve is V1,
The gear C of the refrigeration valve opening of the first order electric expansion valve is specifically included:
As C=1, the V1=100 steps；
As C=2, the V1=150 steps；
As C=3, the V1=200 steps；
As C=4, the V1=300 steps；
As C=5, the V1=400 steps.
5. the control method of frequency-conversion air-conditioning system described in any one of -4 according to claim 1, which is characterized in that described first The gear F of the heating valve opening of grade electric expansion valve meets:
F=D+E-1
Wherein, the D is heating temperature difference △ TheatThe gear of the corresponding heating temperature difference, the E are the corresponding heating of the revolving speed N The gear of compressor rotary speed, described D, E, F are positive integer, and the gear number of the heating temperature difference and the heating compressor The gear number of revolving speed is all larger than equal to 2,
The heating valve opening of the first order electric expansion valve corresponds to the heating valve opening of the first order electric expansion valve Gear F.
6. the control method of frequency-conversion air-conditioning system according to claim 5, which is characterized in that the gear of the heating temperature difference D is specifically included:
As △ TheatAt < -15 DEG C, D=1；
As -15 DEG C≤△ TheatAt < -8 DEG C, D=2；
As -8 DEG C≤△ TheatAt 8 DEG C of <, D=3；
As △ TheatAt >=8 DEG C, D=4.
7. the control method of frequency-conversion air-conditioning system according to claim 5, which is characterized in that the heating compressor rotary speed Gear E specifically include:
As N >=60Hz, E=1；
As N < 60Hz, E=2.
8. the control method of frequency-conversion air-conditioning system according to claim 5, which is characterized in that the first order electronic expansion The heating valve opening of valve is V2,
The gear F of the heating valve opening of the first order electric expansion valve is specifically included:
As F=1, the V2=80 steps；
As F=2, the V2=120 steps；
As F=3, the V2=180 steps；
As F=4, the V2=250 steps；
As F=5, the V2=300 steps.
9. the control method of frequency-conversion air-conditioning system according to claim 1, which is characterized in that the outdoor environment temperature is The temperature of outdoor heat exchanger.
10. the control method of frequency-conversion air-conditioning system according to claim 9, which is characterized in that the outdoor heat exchanger Temperature is the saturation temperature being converted by the saturation pressure of the outdoor heat exchanger.
11. the control method of frequency-conversion air-conditioning system according to claim 1, which is characterized in that the indoor environment temperature For the temperature of indoor heat exchanger.
12. the control method of frequency-conversion air-conditioning system according to claim 11, which is characterized in that the indoor heat exchanger Temperature is the saturation temperature being converted by the saturation pressure of the indoor heat exchanger.
13. a kind of convertible frequency air-conditioner system of the control method using frequency-conversion air-conditioning system of any of claims 1-12 System characterized by comprising
Compressor, the compressor include the first cylinder and the second cylinder, and first cylinder has the first air entry, and described the Two cylinders have the second air entry, and the compressor has exhaust outlet；
Control valve, the control valve include the first valve port to the 4th valve port, and first valve port is connected with the exhaust outlet, third Valve port is connected with the first air entry；
First Heat Exchanger, one end of the First Heat Exchanger are connected with the 4th valve port；
One end of second heat exchanger, second heat exchanger is connected with the second valve port；
Gas-liquid separator, the gas-liquid separator have the first connector, the second connector and outlet, the outlet and described the Two air entries are connected；
One end of first electric expansion valve, first electric expansion valve is connected with the other end of the First Heat Exchanger, described The other end of first electric expansion valve is connected with first connector；And
Second electric expansion valve, one end of second electric expansion valve is connected with the other end of second heat exchanger, described The other end of second electric expansion valve is connected with second connector,
When the frequency-conversion air-conditioning system refrigerating operaton, first electric expansion valve is the first order electric expansion valve and institute Stating the second electric expansion valve is the second level electric expansion valve, when the frequency-conversion air-conditioning system heating operation, described second Electric expansion valve is the first order electric expansion valve and first electric expansion valve is the second level electric expansion valve.
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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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