CN105758034A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN105758034A CN105758034A CN201610209449.8A CN201610209449A CN105758034A CN 105758034 A CN105758034 A CN 105758034A CN 201610209449 A CN201610209449 A CN 201610209449A CN 105758034 A CN105758034 A CN 105758034A
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- increasing compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning system and a control method thereof. The air conditioning system comprises an enhanced vapor injection compressor, a reversing component, two heat exchangers, a flash evaporator and a control device. The enhanced vapor injection compressor comprises a shell, a first-stage compression component and a second-stage compression component. The shell is provided with an exhaust port, an air supply port and two air suction ports, the two air suction ports are connected with air suction passages of the first-stage compression component and the second-stage compression component respectively, and an exhaust passage of the first-stage compression component is connected with the air suction passage of the second-stage compression component. A fourth valve port is respectively connected with the two air suction ports through a three-way division valve. The control device is used for acquiring an operating frequency of the enhanced vapor injection compressor and controlling operating conditions of the three-way division valve according to the operating frequency of the enhanced vapor injection compressor to select an operating mode of the enhanced vapor injection compressor. The air conditioning system has the advantages that a dual-stage compression mode is adopted in medium and high frequencies to increase refrigeration and heating speeds; a single-stage compression mode is adopted in low frequency, and accordingly energy saving and comfort are realized.
Description
Technical field
The present invention relates to technical field of refrigeration equipment, especially relate to a kind of air conditioning system and the control method of a kind of air conditioning system.
Background technology
Along with growth in the living standard, people are also more and more higher to the requirement of domestic air conditioning.Such as require powerful to freeze during domestic air conditioning not only high temperature, can also powerful heat when low temperature, but also want energy saving etc..Common convertible frequency air-conditioner, owing to cost reason majority adopts single-stage compressor, due to rotor single load bearing, vibration and noise are all relatively larger, and high-temperature refrigeration and low-temperature heating are it cannot be guaranteed that special user's demand；According to common double-stage compressor, under low-frequency operation, system stability is too poor again.
Summary of the invention
It is contemplated that at least solve one of technical problem of existence in above-mentioned technology.For this, the invention reside in a kind of air conditioning system of proposition, this air conditioning system is possible not only to realize the output of big ability under medium-high frequency, it is also possible to high energy efficiency even running at low frequency.
The present invention also proposes the control method of a kind of air conditioning system.
Air conditioning system according to embodiments of the present invention, including: air injection enthalpy-increasing compressor, described air injection enthalpy-increasing compressor includes housing, first order compression assembly and second level compression assembly, described housing is provided with air vent, gas supplementing opening and two air entries, said two air entry is connected with the air intake passage of described first order compression assembly and described second level compression assembly respectively, and the exhaust passage of described first order compression assembly is connected with the air intake passage of described second level compression assembly；Commutation assembly, described commutation assembly has the first valve port to the 4th valve port, one of them connection in described first valve port and the second valve port and the 3rd valve port, described 4th valve port connects with another in described second valve port and described 3rd valve port, described first valve port is connected with described air vent, and described 4th valve port is respectively connected with by three-way diverter valve and said two air entry；Two heat exchangers, the first end of said two heat exchanger is connected with described second valve port and described 3rd valve port respectively；Flash vessel, described flash vessel has gas outlet and two gateways, described gas outlet is connected with described gas supplementing opening, and said two gateway is connected with the second end of said two heat exchanger respectively, is in series with restricting element between each described gateway and corresponding described heat exchanger；Control device, described control device is for obtaining the running frequency of described air injection enthalpy-increasing compressor, and the running frequency according to described air injection enthalpy-increasing compressor controls the duty of described three-way diverter valve to select the mode of operation of described air injection enthalpy-increasing compressor, wherein, the mode of operation of described air injection enthalpy-increasing compressor includes single stage compress increasing enthalpy pattern and Two-stage Compression increasing enthalpy pattern.
Air conditioning system according to embodiments of the present invention, control device and control the duty of three-way diverter valve to select the mode of operation of air injection enthalpy-increasing compressor according to the running frequency of air injection enthalpy-increasing compressor, thus enthalpy mode operation can be increased with Two-stage Compression by air injection enthalpy-increasing compressor when medium-high frequency, especially when superhigh temperature and ultralow temperature, the high compression ratio of air injection enthalpy-increasing compressor is capable of the output of big ability, improves cooling and warming speed；When low frequency, automatic switchover single stage compress increases enthalpy mode operation, not only vibrates little, and realizes low power run, when air conditioner load is less, can realize not shutting down work, keep the stability of temperature, and temperature difference fluctuation is little, energy-conservation, comfortable.
Further, first port of described three-way diverter valve is connected with described 4th valve port by reservoir, second port of described three-way diverter valve is connected with the first air entry in said two air entry, and the 3rd port of described three-way diverter valve is connected with the second air entry in said two air entry.
Wherein, when the running frequency of described air injection enthalpy-increasing compressor is more than default switching frequency threshold value, described control device controls the first port of described three-way diverter valve and connects with the second port of described three-way diverter valve, is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described Two-stage Compression；When the running frequency of described air injection enthalpy-increasing compressor is less than or equal to default switching frequency threshold value, described control device controls the first port of described three-way diverter valve and connects with the 3rd port of described three-way diverter valve, is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described single stage compress.
Alternatively, described commutation assembly is cross valve.
Alternatively, each described restricting element is electric expansion valve.
In some embodiments of the invention, described default switching frequency threshold value can be 25～35Hz.
nullIn addition，The embodiment of the present invention also proposed the control method of a kind of air conditioning system，Wherein，Described air conditioning system includes air injection enthalpy-increasing compressor、Commutation assembly、Two heat exchangers and flash vessel，Described air injection enthalpy-increasing compressor includes housing、First order compression assembly and second level compression assembly，Described housing is provided with air vent、Gas supplementing opening and two air entries，Said two air entry is connected with the air intake passage of described first order compression assembly and described second level compression assembly respectively，The exhaust passage of described first order compression assembly is connected with the air intake passage of described second level compression assembly，Described commutation assembly has the first valve port to the 4th valve port，One of them connection in described first valve port and the second valve port and the 3rd valve port，Described 4th valve port connects with another in described second valve port and described 3rd valve port，Described first valve port is connected with described air vent，Described 4th valve port is respectively connected with by three-way diverter valve and said two air entry，First end of said two heat exchanger is connected with described second valve port and described 3rd valve port respectively，Described flash vessel has gas outlet and two gateways，Described gas outlet is connected with described gas supplementing opening，Said two gateway is connected with the second end of said two heat exchanger respectively，It is in series with restricting element between each described gateway and corresponding described heat exchanger，Described control method comprises the steps: to obtain the running frequency of described air injection enthalpy-increasing compressor；Running frequency according to described air injection enthalpy-increasing compressor controls the duty of described three-way diverter valve to select the mode of operation of described air injection enthalpy-increasing compressor, wherein, the mode of operation of described air injection enthalpy-increasing compressor includes single stage compress increasing enthalpy pattern and Two-stage Compression increasing enthalpy pattern.
The control method of air conditioning system according to embodiments of the present invention, by obtaining the running frequency of air injection enthalpy-increasing compressor, then the duty of three-way diverter valve is controlled according to the running frequency of air injection enthalpy-increasing compressor to select the mode of operation of air injection enthalpy-increasing compressor, thus enthalpy mode operation can be increased with Two-stage Compression by air injection enthalpy-increasing compressor when medium-high frequency, especially when superhigh temperature and ultralow temperature, the high compression ratio of air injection enthalpy-increasing compressor is capable of the output of the big ability of air conditioning system, improves cooling and warming speed；When low frequency, automatic switchover single stage compress increases enthalpy mode operation, not only vibrates little, and realizes air conditioning system low power run, when air conditioner load is less, can realize not shutting down work, keep the stability of temperature, and temperature difference fluctuation is little, energy-conservation, comfortable.
According to one embodiment of present invention, first port of described three-way diverter valve is connected with described 4th valve port by reservoir, second port of described three-way diverter valve is connected with the first air entry in said two air entry, 3rd port of described three-way diverter valve is connected with the second air entry in said two air entry, wherein, when the running frequency of described air injection enthalpy-increasing compressor is more than default switching frequency threshold value, second port of the first port and described three-way diverter valve that control described three-way diverter valve connects, it is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described Two-stage Compression；When the running frequency of described air injection enthalpy-increasing compressor is less than or equal to default switching frequency threshold value, 3rd port of the first port and described three-way diverter valve that control described three-way diverter valve connects, and is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described single stage compress.
Specifically, described default switching frequency threshold value can be 25～35Hz.
The additional aspect of the present invention and advantage will part provide in the following description, and part will become apparent from the description below, or is recognized by the practice of the present invention.
Accompanying drawing explanation
Fig. 1 is the air conditioning system schematic diagram when refrigeration mode according to an embodiment of the invention；
Fig. 2 is the air conditioning system schematic diagram when heating mode according to an embodiment of the invention；
Fig. 3 is the flow chart of the control method of air conditioning system according to embodiments of the present invention；
Fig. 4 is the flow chart of the control method of air conditioning system according to an embodiment of the invention.
Accompanying drawing labelling:
Air conditioning system 100,
Air injection enthalpy-increasing compressor 1, air vent a, gas supplementing opening b, the first air entry c, the second air entry d,
Reservoir 11, gas returning port n,
Commutation assembly 2, the first valve port h, the second valve port i, the 3rd valve port j, the 4th valve port k,
Three-way diverter valve 3, the first port 31, the second port 32, the 3rd port 33,
Outdoor heat exchanger 4, indoor heat exchanger 5,
Flash vessel 6, gas outlet r, the first gateway s, the second gateway t,
First throttle element 71, second section fluid element 72.
Detailed description of the invention
Being described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of same or like function from start to finish.The embodiment described below with reference to accompanying drawing is illustrative of, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Following disclosure provides many different embodiments or example for realizing the different structure of the present invention.In order to simplify disclosure of the invention, hereinafter parts and setting to specific examples are described.Certainly, they are only merely illustrative, and are not intended to the restriction present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.This repetition is for purposes of simplicity and clarity, the relation between itself not indicating discussed various embodiment and/or arranging.Additionally, the example of the various specific technique that the invention provides and material, but those of ordinary skill in the art are it can be appreciated that the use of the property of can be applicable to of other techniques and/or other materials.
Below with reference to the accompanying drawings the control method of air conditioning system 100 according to embodiments of the present invention and air conditioning system is described.
In conjunction with shown in Fig. 1 and Fig. 2, air conditioning system 100 according to embodiments of the present invention, including: air injection enthalpy-increasing compressor 1, commutation 2, two heat exchangers of assembly (outdoor heat exchanger 4 as shown in Figure 1 and indoor heat exchanger 5), flash vessel 6 with control device (in figure not specifically illustrated).
Specifically, air injection enthalpy-increasing compressor 1 includes housing, first order compression assembly and second level compression assembly, housing is provided with air vent a, gas supplementing opening b and two air entries (such as the first air entry c shown in Fig. 1 and the second air entry d), two air entries are connected with the air intake passage of first order compression assembly and second level compression assembly respectively, and the exhaust passage of first order compression assembly is connected with the air intake passage of second level compression assembly.
As shown in Figure 1 or 2, air entry includes the first air entry c and the second air entry d, first air entry c is connected with the air intake passage of first order compression assembly, second air entry d is connected with the air intake passage of second level compression assembly, and the exhaust passage of the first compression assembly is connected with the air intake passage of the second compression assembly.After coolant enters air injection enthalpy-increasing compressor 1 from the first air entry c, coolant sequentially passes through first order compression assembly and second level compression assembly two stages of compression, i.e. Two-stage Compression, and air injection enthalpy-increasing compressor 1 increases enthalpy pattern with Two-stage Compression and is operated；When coolant enters air injection enthalpy-increasing compressor 1 from the second air entry d, coolant only compresses at second level compression assembly, i.e. single stage compress, and air injection enthalpy-increasing compressor 1 increases enthalpy pattern with single stage compress and is operated.It is to say, air injection enthalpy-increasing compressor 1 has Two-stage Compression increases enthalpy pattern and single stage compress increasing enthalpy pattern, and air injection enthalpy-increasing compressor 1 can switch between above two pattern.It is understood that the air injection enthalpy-increasing compressor 1 of the present invention can adopt the existing compressor with Two-stage Compression pattern and single stage compress pattern, the concrete contraction principle of coolant has been prior art by compressor, is just not described in detail here.
Commutation assembly 2 has the first valve port h, the second valve port i, the 3rd valve port j and the four valve port k, one of them connection in first valve port h and the second valve port i and the 3rd valve port j, another connection in 4th valve port k and the second valve port i and the 3rd valve port j, that is, when the first valve port h and the second valve port i connects, 4th valve port k then connects with the 3rd valve port j, and when the first valve port h and the three valve port j connection, the 4th valve port k then connects with the second valve port i.
First valve port h is connected with air vent a, 4th valve port k is respectively connected with by three-way diverter valve 3 and two air entries, thus, coolant can select an air entry from two air entries to return in air injection enthalpy-increasing compressor 1 by the connected state of three-way diverter valve 3, it is achieved single stage compress or Two-stage Compression.
Further, as shown in Figure 1 or 2, first port 31 of three-way diverter valve 3 is connected with the 4th valve port k by reservoir 11, second port 32 of three-way diverter valve 3 is connected with the first air entry c in two air entries, and the 3rd port 33 of three-way diverter valve 3 is connected with the second air entry d in two air entries.So, when the first port 31 of three-way diverter valve 3 connects with the second port 32 of three-way diverter valve 3, coolant can enter air injection enthalpy-increasing compressor 1 from the 4th valve port k of commutation assembly 2 first port the 31, second port 32 through three-way diverter valve 3 and the first air entry c, carries out Two-stage Compression；When the first port 31 of three-way diverter valve 3 connects with the 3rd port 33 of three-way diverter valve 3, coolant can enter air injection enthalpy-increasing compressor 1 from the 4th valve port k of commutation assembly 2 first port the 31, the 3rd port 33 through three-way diverter valve 3 and the second air entry d, carries out single stage compress.The coolant of the High Temperature High Pressure formed after compression in cylinder, is expelled to the first valve port h from air vent a.
Preferably, commutation assembly 2 can be cross valve, when air conditioning system 100 adopts refrigeration mode, first valve port h and the second valve port i connection, 3rd valve port j and the four valve port k connection, when air conditioning system 100 adopts heating mode, the first valve port h and the three valve port j connection, the second valve port i and the four valve port k connection.Certainly, the invention is not restricted to this, commutation assembly 2 can also be formed as other elements, as long as having the first valve port h to the 4th valve port k and can realizing commutating.
First end of two heat exchangers (the such as outdoor heat exchanger 4 shown in Fig. 1 and indoor heat exchanger 5) is connected with the second valve port i and the 3rd valve port j respectively.As it is shown in figure 1, the first end 4a and the second valve port i of outdoor heat exchanger 4 are connected, the first end 5a and the three valve port j of indoor heat exchanger 5 is connected.
Flash vessel 6 has gas outlet r and two gateways (such as the first gateway s shown in Fig. 1 and the second gateway t), gas outlet r is connected with gas supplementing opening b, so, can return to air injection enthalpy-increasing compressor 1 from gas supplementing opening b from the isolated steam state coolant of flash vessel 6 and be compressed, to realize air injection enthalpy-increasing.
Two gateways are connected with the second end of two heat exchangers respectively, are in series with restricting element (such as the first throttle element 71 shown in Fig. 1 and second section fluid element 72) between each gateway and corresponding heat exchanger.As shown in Figure 1, first gateway s is connected with the second end 4b of outdoor heat exchanger 4, it is serially connected with first throttle element 71 between first gateway s and outdoor heat exchanger 4, second gateway t is connected with the second end 5b of indoor heat exchanger 5, and second be serially connected with second section fluid element 72 between gateway t and indoor heat exchanger 5, wherein, first throttle element 71 and second section fluid element 72 all play the effect of reducing pressure by regulating flow.
Preferably, each restricting element can be electric expansion valve.Certainly, the invention is not restricted to this, restricting element can also be the structures such as the combination of capillary tube or capillary tube and electric expansion valve, as long as the effect of reducing pressure by regulating flow can be played.
Control device for obtaining the running frequency of air injection enthalpy-increasing compressor 1, and the running frequency according to air injection enthalpy-increasing compressor 1 controls the duty of three-way diverter valve 3 to select the mode of operation of air injection enthalpy-increasing compressor 1, wherein, the mode of operation of air injection enthalpy-increasing compressor 1 includes single stage compress increasing enthalpy pattern and Two-stage Compression increasing enthalpy pattern.
Specifically, when the running frequency of air injection enthalpy-increasing compressor 1 is more than default switching frequency threshold value, the first port 31 controlling device control three-way diverter valve 3 connects with the second port 32 of three-way diverter valve 3, is operated so that air injection enthalpy-increasing compressor 1 increases enthalpy pattern with described Two-stage Compression；When the running frequency of air injection enthalpy-increasing compressor 1 is less than or equal to default switching frequency threshold value, the first port 31 controlling device control three-way diverter valve 3 connects with the 3rd port 33 of three-way diverter valve 3, is operated so that air injection enthalpy-increasing compressor 1 increases enthalpy pattern with single stage compress.
In an example of the present invention, according to heating the feature cold with heat, and in conjunction with the efficiency curve characteristic of air injection enthalpy-increasing compressor 1, default switching frequency threshold value can be 25～35Hz.
Air conditioning system according to embodiments of the present invention, control device and control the duty of three-way diverter valve to select the mode of operation of air injection enthalpy-increasing compressor according to the running frequency of air injection enthalpy-increasing compressor, thus enthalpy mode operation can be increased with Two-stage Compression by air injection enthalpy-increasing compressor when medium-high frequency, especially when superhigh temperature and ultralow temperature, the high compression ratio of air injection enthalpy-increasing compressor is capable of the output of big ability, improves cooling and warming speed；When low frequency, automatic switchover single stage compress increases enthalpy mode operation, not only vibrates little, and realizes low power run, when air conditioner load is less, can realize not shutting down work, keep the stability of temperature, and temperature difference fluctuation is little, energy-conservation, comfortable.
Below with reference to Fig. 1-Fig. 2, the air conditioning system 100 according to one specific embodiment of the present invention is described.
Seeing figures.1.and.2, air conditioning system 100 includes air injection enthalpy-increasing compressor 1, commutation assembly 2, three-way diverter valve 3, outdoor heat exchanger 4, indoor heat exchanger 5, flash vessel 6, first throttle element 71, second section fluid element 72 and controls device.Wherein, commutation assembly 2 is cross valve, first throttle element 71 and second section fluid element 72 are electric expansion valve, control device and select the mode of operation of air injection enthalpy-increasing compressor 1 according to the duty of the running frequency f control three-way diverter valve 3 of air injection enthalpy-increasing compressor 1.
Specifically, as shown in Figure 1 or 2, air injection enthalpy-increasing compressor 1 includes housing, reservoir 11, first order compression assembly and second level compression assembly, and housing is provided with air vent a, gas supplementing opening b, the first air entry c and the second air entry d, and reservoir 11 is provided with gas returning port n；Cross valve has the first valve port h, the second valve port i, the 3rd valve port j and the four valve port k, and flash vessel 6 has gas outlet r, the first gateway s and the second gateway t.
Wherein, the first air entry c connects with the air intake passage of first order compression assembly, and the second air entry d connects with the air intake passage of second level compression assembly, and the exhaust passage of first order compression assembly is connected with the air intake passage of second level compression assembly；First valve port h of cross valve is connected with air vent a；Second valve port i is connected with the first end 4a of outdoor heat exchanger 4, and the 3rd valve port j is connected with the first end 5a of indoor heat exchanger 5, and the 4th valve port k is connected with gas returning port n；The outlet of reservoir 11 is connected with the first port 31 of three-way diverter valve 3, and the second port 32 of three-way diverter valve 3 is connected with the first air entry c, and the 3rd port 33 of three-way diverter valve 3 is connected with the second air entry d；The gas outlet r of flash vessel 6 is connected with gas supplementing opening b, is serially connected with first throttle element 71 between the first gateway s and the second end 4b of outdoor heat exchanger 4, concatenates second section fluid element 72 between the second gateway t and the second end 5b of indoor heat exchanger 5.
As it is shown in figure 1, when air conditioning system 100 is refrigeration mode, the first valve port h and the second valve port i conducting of cross valve and the 4th valve port k and the 3rd valve port j turn on.
The flow direction of coolant is as follows: enter into condensation outdoor heat exchanger 4 from the air vent a of the air injection enthalpy-increasing compressor 1 High Temperature High Pressure coolant discharged through the first valve port h and the second valve port i of cross valve, coolant carries out the second end 4b of heat exchanger 4 outdoor after heat exchange in outdoor heat exchanger 4 and discharges with outdoor environment, the liquid phase coolant being then discharged out is through the reducing pressure by regulating flow of first throttle element 71, gas-liquid two-phase coolant after throttling enters flash vessel 6 from the first gateway s, and carries out gas-liquid separation in flash vessel 6.
From flash vessel 6, isolated steam state coolant is from gas outlet r through gas supplementing opening b, returns in air injection enthalpy-increasing compressor 1, discharges from the air vent a of air injection enthalpy-increasing compressor 1 and proceed circulation after overcompression.
From flash vessel 6, isolated liquid refrigerants flows out from the second gateway t, then coolant enters in indoor heat exchanger 5 after the reducing pressure by regulating flow of second section fluid element 72, coolant carries out heat exchange with indoor environment in indoor heat exchanger 5 and undergoes phase transition, and indoor environment is freezed, user is made to obtain cryogenic temperature and refrigerating capacity, the gas phase refrigerant that heat exchanger 5 is discharged indoor is through the 3rd valve port j and the four valve port k of cross valve, then enters reservoir 11 from gas returning port n, completes kind of refrigeration cycle.
As in figure 2 it is shown, when air conditioning system 100 is heating mode, the first valve port h and the three valve port j conducting of cross valve and the 4th valve port k and the second valve port i turn on.
The flow direction of coolant is as follows: from the air vent a of the air injection enthalpy-increasing compressor 1 high pressure gaseous coolant discharged, enter in indoor heat exchanger 5 through the first valve port h and the three valve port j of cross valve, the coolant of the High Temperature High Pressure in indoor heat exchanger 5 and indoor environment carry out phase-change heat-exchange, so that indoor environment is heated, the liquid phase coolant that heat exchanger 5 is discharged indoor carries out first time throttling through second section fluid element 72, gas-liquid two-phase mixing coolant after throttling enters in flash vessel 6, and coolant is carried out gas-liquid separation by flash vessel 6.
From flash vessel 6, isolated steam state coolant is from gas outlet r through gas supplementing opening b, returns in air injection enthalpy-increasing compressor 1, discharges from the air vent a of air injection enthalpy-increasing compressor 1 and proceed circulation after overcompression.
From flash vessel 6, isolated liquid refrigerants flows out from the first gateway s, enter into after first throttle element 71 second throttle blood pressure lowering in outdoor heat exchanger 4, after refrigerant evaporation heat exchange in outdoor heat exchanger 4, the second valve port i and the four valve port k through cross valve, enter reservoir 11 from gas returning port n, complete to heat circulation.
Wherein, when gas phase refrigerant returns the cylinder compression of air injection enthalpy-increasing compressor 1 from reservoir 11 by three-way diverter valve 3, control device to judge according to the running frequency of air injection enthalpy-increasing compressor 1, namely the duty automatically controlling three-way diverter valve 3 is that the first port 31 connects with the second port 32 or the first port 31 connects with the 3rd port, makes low-temp low-pressure gas phase refrigerant carry out Two-stage Compression or single stage compress.
Therefore, air conditioning system 100 according to embodiments of the present invention, Two-stage Compression pattern is used when altofrequency, realizing fast-refrigerating or heat, when heating particularly in superhigh temperature refrigeration and ultralow temperature, heat pump performance is more powerful, improve the comfortableness used, use single stage compress pattern when low frequency, reduce output, reach energy-conservation purpose.
Fig. 3 is the flow chart of the control method of air conditioning system according to embodiments of the present invention.nullWherein，This air conditioning system can be the air conditioning system that above-described embodiment describes，It includes air injection enthalpy-increasing compressor、Commutation assembly、Two heat exchangers and flash vessel，Air injection enthalpy-increasing compressor includes housing、First order compression assembly and second level compression assembly，Housing is provided with air vent、Gas supplementing opening and two air entries，Two air entries are connected with the air intake passage of first order compression assembly and second level compression assembly respectively，The exhaust passage of first order compression assembly is connected with the air intake passage of second level compression assembly，Commutation assembly has the first valve port to the 4th valve port，One of them connection in first valve port and the second valve port and the 3rd valve port，Another connection in 4th valve port and the second valve port and the 3rd valve port，First valve port is connected with air vent，4th valve port is respectively connected with by three-way diverter valve and two air entries，First end of two heat exchangers is connected with the second valve port and the 3rd valve port respectively，Flash vessel has gas outlet and two gateways，Gas outlet is connected with gas supplementing opening，Two gateways are connected with the second end of two heat exchangers respectively，It is in series with restricting element between each gateway and corresponding heat exchanger.As it is shown on figure 3, the control method of this air conditioning system comprises the steps:
S1, obtains the running frequency of air injection enthalpy-increasing compressor.
S2, controls the duty of three-way diverter valve to select the mode of operation of air injection enthalpy-increasing compressor according to the running frequency of air injection enthalpy-increasing compressor, and wherein, the mode of operation of air injection enthalpy-increasing compressor includes single stage compress and increases enthalpy pattern and Two-stage Compression increasing enthalpy pattern.
According to one embodiment of present invention, first port of three-way diverter valve is connected with described 4th valve port by reservoir, the first air entry in second port of three-way diverter valve and two air entries is connected, the second air entry in 3rd port of three-way diverter valve and two air entries is connected, wherein, when the running frequency of air injection enthalpy-increasing compressor is more than default switching frequency threshold value, the first port controlling three-way diverter valve connects with the second port of three-way diverter valve, is operated so that air injection enthalpy-increasing compressor increases enthalpy pattern with Two-stage Compression；When the running frequency of air injection enthalpy-increasing compressor is less than or equal to default switching frequency threshold value, the first port controlling three-way diverter valve connects with the 3rd port of three-way diverter valve, so that air injection enthalpy-increasing compressor is operated with single stage compress increasing enthalpy pattern.
Specifically, as shown in Figure 4, air conditioning system, in refrigeration with when heating, sets switching frequency threshold value that namely single twin-stage switching frequency of air injection enthalpy-increasing compressor preset as F1, and the span of F1 is 25Hz～35Hz.
The actual motion frequency of detection air injection enthalpy-increasing compressor is f, as f > F1, control the first port and the connection of the second port of three-way diverter valve, now, reservoir connects with the first air entry of air injection enthalpy-increasing compressor, coolant enters the compression of first order compression assembly from the first air entry of air injection enthalpy-increasing compressor, then it is compressed from the entrance second level, the exhaust passage compression assembly of first order compression assembly, High Temperature High Pressure coolant after compression is discharged from the air vent of air injection enthalpy-increasing compressor, air injection enthalpy-increasing compressor increases enthalpy pattern with Two-stage Compression and is operated.
As f≤F1, control the first port and the connection of the 3rd port of three-way diverter valve, now, reservoir connects with the second air entry of air injection enthalpy-increasing compressor, coolant enters second level compression assembly from the second air entry of air injection enthalpy-increasing compressor and is compressed, High Temperature High Pressure coolant after compression is discharged from the air vent of air injection enthalpy-increasing compressor, and air injection enthalpy-increasing compressor increases enthalpy pattern with single stage compress and is operated.
Therefore, in an embodiment of the present invention, can controlling three-way diverter valve according to the actual motion frequency of air injection enthalpy-increasing compressor, using Two-stage Compression to increase enthalpy mode operation thus realizing the air injection enthalpy-increasing compressor when medium-high frequency, when low frequency, air injection enthalpy-increasing compressor uses single stage compress to increase enthalpy mode operation.
The control method of air conditioning system according to embodiments of the present invention, by obtaining the running frequency of air injection enthalpy-increasing compressor, then the duty of three-way diverter valve is controlled according to the running frequency of air injection enthalpy-increasing compressor to select the mode of operation of air injection enthalpy-increasing compressor, thus enthalpy mode operation can be increased with Two-stage Compression by air injection enthalpy-increasing compressor when medium-high frequency, especially when superhigh temperature and ultralow temperature, the high compression ratio of air injection enthalpy-increasing compressor is capable of the output of the big ability of air conditioning system, improves cooling and warming speed；When low frequency, automatic switchover single stage compress increases enthalpy mode operation, not only vibrates little, and realizes air conditioning system low power run, when air conditioner load is less, can realize not shutting down work, keep the stability of temperature, and temperature difference fluctuation is little, energy-conservation, comfortable.
In describing the invention, it will be appreciated that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, " interior ", " outward " be based on orientation shown in the drawings or position relationship; be for only for ease of the description present invention and simplifying and describe; rather than instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only for descriptive purposes, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include one or more these features.In describing the invention, " multiple " are meant that two or more, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, for instance, it is possible to it is fixing connection, it is also possible to be removably connect, or integral；Can be mechanically connected, it is also possible to be electrical connection, it is also possible to be communication；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be connection or the interaction relationship of two elements of two element internals.For the ordinary skill in the art, it is possible to understand above-mentioned term concrete meaning in the present invention as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of fisrt feature level height higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means in conjunction with this embodiment or example describe are contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature can combine in one or more embodiments in office or example in an appropriate manner.Additionally, when not conflicting, the feature of the different embodiments described in this specification or example and different embodiment or example can be carried out combining and combining by those skilled in the art.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: these embodiments can being carried out multiple change, amendment, replacement and modification when without departing from principles of the invention and objective, the scope of the present invention is limited by claim and equivalent thereof.
Claims (9)
1. an air conditioning system, it is characterised in that including:
Air injection enthalpy-increasing compressor, described air injection enthalpy-increasing compressor includes housing, first order compression assembly and second level compression assembly, described housing is provided with air vent, gas supplementing opening and two air entries, said two air entry is connected with the air intake passage of described first order compression assembly and described second level compression assembly respectively, and the exhaust passage of described first order compression assembly is connected with the air intake passage of described second level compression assembly；
Commutation assembly, described commutation assembly has the first valve port to the 4th valve port, one of them connection in described first valve port and the second valve port and the 3rd valve port, described 4th valve port connects with another in described second valve port and described 3rd valve port, described first valve port is connected with described air vent, and described 4th valve port is respectively connected with by three-way diverter valve and said two air entry；
Two heat exchangers, the first end of said two heat exchanger is connected with described second valve port and described 3rd valve port respectively；
Flash vessel, described flash vessel has gas outlet and two gateways, described gas outlet is connected with described gas supplementing opening, and said two gateway is connected with the second end of said two heat exchanger respectively, is in series with restricting element between each described gateway and corresponding described heat exchanger；
Control device, described control device is for obtaining the running frequency of described air injection enthalpy-increasing compressor, and the running frequency according to described air injection enthalpy-increasing compressor controls the duty of described three-way diverter valve to select the mode of operation of described air injection enthalpy-increasing compressor, wherein, the mode of operation of described air injection enthalpy-increasing compressor includes single stage compress increasing enthalpy pattern and Two-stage Compression increasing enthalpy pattern.
2. air conditioning system according to claim 1, it is characterized in that, first port of described three-way diverter valve is connected with described 4th valve port by reservoir, second port of described three-way diverter valve is connected with the first air entry in said two air entry, and the 3rd port of described three-way diverter valve is connected with the second air entry in said two air entry.
3. air conditioning system according to claim 2, it is characterised in that
When the running frequency of described air injection enthalpy-increasing compressor is more than default switching frequency threshold value, described control device controls the first port of described three-way diverter valve and connects with the second port of described three-way diverter valve, is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described Two-stage Compression；
When the running frequency of described air injection enthalpy-increasing compressor is less than or equal to default switching frequency threshold value, described control device controls the first port of described three-way diverter valve and connects with the 3rd port of described three-way diverter valve, is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described single stage compress.
4. the air conditioning system according to any one of claim 1-3, it is characterised in that described commutation assembly is cross valve.
5. air conditioning system according to claim 1, it is characterised in that each described restricting element is electric expansion valve.
6. air conditioning system according to claim 3, it is characterised in that described default switching frequency threshold value is 25～35Hz.
null7. the control method of an air conditioning system，It is characterized in that，Described air conditioning system includes air injection enthalpy-increasing compressor、Commutation assembly、Two heat exchangers and flash vessel，Described air injection enthalpy-increasing compressor includes housing、First order compression assembly and second level compression assembly，Described housing is provided with air vent、Gas supplementing opening and two air entries，Said two air entry is connected with the air intake passage of described first order compression assembly and described second level compression assembly respectively，The exhaust passage of described first order compression assembly is connected with the air intake passage of described second level compression assembly，Described commutation assembly has the first valve port to the 4th valve port，One of them connection in described first valve port and the second valve port and the 3rd valve port，Described 4th valve port connects with another in described second valve port and described 3rd valve port，Described first valve port is connected with described air vent，Described 4th valve port is respectively connected with by three-way diverter valve and said two air entry，First end of said two heat exchanger is connected with described second valve port and described 3rd valve port respectively，Described flash vessel has gas outlet and two gateways，Described gas outlet is connected with described gas supplementing opening，Said two gateway is connected with the second end of said two heat exchanger respectively，It is in series with restricting element between each described gateway and corresponding described heat exchanger，Described control method comprises the steps:
Obtain the running frequency of described air injection enthalpy-increasing compressor；
Running frequency according to described air injection enthalpy-increasing compressor controls the duty of described three-way diverter valve to select the mode of operation of described air injection enthalpy-increasing compressor, wherein, the mode of operation of described air injection enthalpy-increasing compressor includes single stage compress increasing enthalpy pattern and Two-stage Compression increasing enthalpy pattern.
8. the control method of air conditioning system according to claim 7, it is characterized in that, first port of described three-way diverter valve is connected with described 4th valve port by reservoir, second port of described three-way diverter valve is connected with the first air entry in said two air entry, 3rd port of described three-way diverter valve is connected with the second air entry in said two air entry, wherein
When the running frequency of described air injection enthalpy-increasing compressor is more than default switching frequency threshold value, second port of the first port and described three-way diverter valve that control described three-way diverter valve connects, and is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described Two-stage Compression；
When the running frequency of described air injection enthalpy-increasing compressor is less than or equal to default switching frequency threshold value, 3rd port of the first port and described three-way diverter valve that control described three-way diverter valve connects, and is operated so that described air injection enthalpy-increasing compressor increases enthalpy pattern with described single stage compress.
9. the control method of air conditioning system according to claim 8, it is characterised in that described default switching frequency threshold value is 25～35Hz.
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| CN107878154A (en) * | 2017-10-24 | 2018-04-06 | 珠海格力电器股份有限公司 | Two-stage enthalpy-increasing vehicle air conditioning system and control method |
| CN108088103A (en) * | 2017-12-08 | 2018-05-29 | 珠海格力电器股份有限公司 | Air conditioning system and control method |
| CN108731224A (en) * | 2018-08-31 | 2018-11-02 | 广东美的制冷设备有限公司 | Control method, device, equipment and the fixed frequency air conditioner system of fixed frequency air conditioner system |
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| CN112902282A (en) * | 2021-01-28 | 2021-06-04 | 广东芬尼克兹节能设备有限公司 | Cascade type heat pump start-stop control method and device, computer equipment and storage medium |
| CN115200179A (en) * | 2022-06-28 | 2022-10-18 | 珠海格力电器股份有限公司 | Air conditioning system, throttling control method and device thereof, and storage medium |
| CN115200179B (en) * | 2022-06-28 | 2023-09-29 | 珠海格力电器股份有限公司 | Air conditioning system, throttle control method and device thereof and storage medium |
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