CN104266318A - Control method and system of multi-connected air conditioning unit - Google Patents
Control method and system of multi-connected air conditioning unit Download PDFInfo
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- CN104266318A CN104266318A CN201410579483.5A CN201410579483A CN104266318A CN 104266318 A CN104266318 A CN 104266318A CN 201410579483 A CN201410579483 A CN 201410579483A CN 104266318 A CN104266318 A CN 104266318A
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- Prior art keywords
- expansion valve
- aperture
- interior machine
- machine
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005057 refrigeration Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000003507 refrigerant Substances 0.000 abstract description 60
- 230000007774 longterm Effects 0.000 abstract description 4
- 230000000717 retained effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method and a system of a multi-connected air conditioning unit, which comprises the steps of judging whether an idle indoor unit exists or not; if yes, judging the operation mode; in a refrigeration mode, judging whether the opening degree of a main electronic expansion valve of the working indoor unit is greater than or equal to a first threshold value or not, and judging whether the value obtained by subtracting the temperature of a heat exchanger of the indoor unit from the ambient temperature of the indoor unit is less than or equal to a second threshold value or not; if so, adjusting the main electronic expansion valve of the non-working internal machine to a first opening degree, and adjusting the auxiliary electronic expansion valve to a second opening degree; in the heating mode, judging whether the opening degree of the electronic expansion valve of the outdoor unit is greater than or equal to a third threshold value or not, and judging whether the value obtained by subtracting the temperature of the heat exchanger of the outdoor unit from the environment temperature of the outdoor unit is less than or equal to a fourth threshold value or not; if so, the auxiliary electronic expansion valve of the non-working internal machine is adjusted to a third opening degree, and the main electronic expansion valve is adjusted to a fourth opening degree, so that the refrigerant retained in the internal machine flows out and participates in circulation, and the long-term reliable operation of the compressor and the air conditioning unit is ensured.
Description
Technical field
The present invention relates to air-conditioning technical field, more particularly, relate to a kind of control method and system of VRF Air Conditioning System.
Background technology
Refrigerant is the material completing thermodynamic cycle in air-conditioner set, and it absorbs the heat of cooled object at low temperatures, then transfers heat to cooling water or air at relatively high temperatures.But, when the cold medium shortage in air-conditioner set, during as scarce fluorine, can cause compressor exhaust temperature and motor temperature too high, cause motor to burn out, the compressor lost of life.
Especially for the VRF Air Conditioning System that an one-driven-several type air-conditioner set i.e. off-premises station and multiple indoor set are formed, when there is indoor set and not working, refrigerant is easily deposited in idle indoor set, cause in VRF Air Conditioning System and lack refrigerant, and then cause the lost of life of compressor.
Summary of the invention
In view of this, the invention provides a kind of control method of VRF Air Conditioning System, to solve in prior art cause VRF Air Conditioning System to lack because refrigerant is deposited in idle indoor set problem that refrigerant causes the compressor lost of life.
Present invention also offers a kind of control system of VRF Air Conditioning System.
For achieving the above object, the invention provides following technical scheme:
A kind of control method of VRF Air Conditioning System, the multiple interior machine that described VRF Air Conditioning System comprises an outer machine and is connected with described outer machine, described interior machine comprises interior machine heat exchanger, main electric expansion valve and auxiliary electron expansion valve, and wherein, described control method comprises:
Judge whether VRF Air Conditioning System has idle interior machine;
If had, judge the operational mode of described air-conditioner set;
If be in refrigeration mode, obtain the aperture of the main electric expansion valve of the interior machine of work, interior machine environment temperature and interior machine heat exchanger temperature; Judge whether the aperture of described main electric expansion valve is more than or equal to first threshold, and whether the value that described interior machine environment temperature deducts interior machine heat exchanger temperature is less than or equal to Second Threshold; If, then the main electric expansion valve of idle interior machine is adjusted to the first aperture, and the auxiliary electron expansion valve of described idle interior machine is adjusted to the second aperture, if not, then after Preset Time, obtain the aperture of the main electric expansion valve of the interior machine of work, interior machine environment temperature and interior machine heat exchanger temperature;
If be in heating mode, obtain the aperture of the electric expansion valve of outer machine, outer machine environment temperature and outer machine heat exchanger temperature; Judge whether the aperture of described electric expansion valve is more than or equal to the 3rd threshold value, and whether the value that described outer machine environment temperature deducts outer machine heat exchanger temperature is less than or equal to the 4th threshold value; If, then the auxiliary electron expansion valve of idle interior machine is adjusted to the 3rd aperture, and the main electric expansion valve of described idle interior machine is adjusted to the 4th aperture, if not, then after Preset Time, obtain the aperture of the electric expansion valve of outer machine, outer machine environment temperature and outer machine heat exchanger temperature.
Preferably, also comprise:
Judge whether the running time of VRF Air Conditioning System is greater than the very first time, if so, then judge whether described air-conditioner set exists idle interior machine, the scope of the described very first time is 10min ~ 15min.
Preferably, after the auxiliary electron expansion valve of described idle interior machine being adjusted to the second aperture or the main electric expansion valve of described idle interior machine being adjusted to the 4th aperture, also comprise:
After the second Preset Time, rejudge VRF Air Conditioning System and whether there is idle interior machine.
Preferably, the scope of described first threshold is 3 DEG C ~ 5 DEG C, and the scope of described Second Threshold is 96% ~ 100%; The scope of described first aperture is 20% ~ 25%, and the scope of described second aperture is 30% ~ 50%.
Preferably, the scope of described 3rd threshold value is 3 DEG C ~ 5 DEG C, and the scope of described 4th threshold value is 96% ~ 100%; The scope of described 3rd aperture is 15% ~ 20%, and the scope of described 4th aperture is 20% ~ 25%.
A kind of control system of VRF Air Conditioning System, the multiple interior machine that described VRF Air Conditioning System comprises an outer machine and is connected with described outer machine, described interior machine comprises interior machine heat exchanger, main electric expansion valve and auxiliary electron expansion valve, and wherein, described control system comprises:
First judge module, for judging whether VRF Air Conditioning System has idle interior machine, if had, then produces the first control instruction and is sent to the second judge module;
Second judge module, for receiving described first control instruction, and judges the operational mode of described air-conditioner set, if be in refrigeration mode, then produce the second control instruction and be sent to acquisition module, if be in heating mode, then produce the 3rd control instruction and be sent to acquisition module;
Acquisition module, for after receiving described second control instruction, the aperture of the main electric expansion valve of the interior machine of acquisition work, interior machine environment temperature and interior machine heat exchanger temperature, and the data of acquisition are sent to the 3rd judge module, or after receiving described 3rd control instruction, obtain the aperture of the electric expansion valve of outer machine, outer machine environment temperature and outer machine heat exchanger temperature, and the data of acquisition are sent to described 3rd judge module;
3rd judge module, for after receiving the data, judge whether the aperture of the main electric expansion valve of the interior machine of work is more than or equal to first threshold and whether the value that described interior machine environment temperature deducts interior machine heat exchanger temperature is less than or equal to Second Threshold, if, then produce the 4th control instruction and be sent to adjustment module, if not, then after Preset Time, produce the second control instruction and be sent to described acquisition module; Or described 3rd judge module after receiving the data, judge whether the aperture of the electric expansion valve of outer machine is more than or equal to the 3rd threshold value and whether the value that described outer machine environment temperature deducts outer machine heat exchanger temperature is less than or equal to the 4th threshold value, if, then produce the 5th control instruction and be sent to adjustment module, if not, then after Preset Time, produce the 3rd control instruction and be sent to described acquisition module;
Adjustment module, for after receiving described 4th control instruction, the main electric expansion valve of idle interior machine is adjusted to the first aperture, and the auxiliary electron expansion valve of described idle interior machine is adjusted to the second aperture, or after receiving described 5th control instruction, the auxiliary electron expansion valve of idle interior machine is adjusted to the 3rd aperture, and the main electric expansion valve of described idle interior machine is adjusted to the 4th aperture.
Preferably, also comprise:
4th judge module, for judging whether the running time of VRF Air Conditioning System is greater than the very first time, if, then produce the 6th control instruction and be sent to described first judge module, to judge whether described air-conditioner set exists idle interior machine, the scope of the described very first time is 10min ~ 15min.
Preferably, described adjustment module is also sent to described first judge module for generation of the 6th control instruction, rejudges VRF Air Conditioning System whether have idle interior machine to make described first judge module after the second Preset Time.
Preferably, the scope of described first threshold is 3 DEG C ~ 5 DEG C, and the scope of described Second Threshold is 96% ~ 100%; The scope of described first aperture is 20% ~ 25%, and the scope of described second aperture is 30% ~ 50%.
Preferably, the scope of described 3rd threshold value is 3 DEG C ~ 5 DEG C, and the scope of described 4th threshold value is 96% ~ 100%; The scope of described 3rd aperture is 15% ~ 20%, and the scope of described 4th aperture is 20% ~ 25%.
Compared with prior art, technical scheme provided by the present invention has the following advantages:
The control method of VRF Air Conditioning System provided by the present invention and system, when VRF Air Conditioning System has idle interior machine, the judgment mode lacking refrigerant is determined according to the operational mode of air-conditioner set, if be namely in refrigeration mode, then judge whether system lacks refrigerant according to the parameter of machine in work, if be in heating mode, then judge whether system lacks refrigerant according to the parameter of outer machine, then when air-conditioner set lacks refrigerant, open main electric expansion valve and the auxiliary electron expansion valve of idle interior machine, the refrigerant be trapped in idle interior machine is flowed out, participate in the circulation of air-conditioner set refrigerant, the reliability of compressor is improved with this, guarantee the operation reliably and with long-term of air-conditioner set.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The VRF Air Conditioning System structural representation that Fig. 1 provides for the embodiment of the present invention one;
Fig. 2 a is the interior fundamental diagram of machine when refrigeration mode in the embodiment of the present invention one;
Fig. 2 b is the interior fundamental diagram of machine when heating mode in the embodiment of the present invention one;
The control method flow chart of the VRF Air Conditioning System that Fig. 3 provides for the embodiment of the present invention one;
The Control system architecture schematic diagram of the VRF Air Conditioning System that Fig. 4 provides for the embodiment of the present invention two.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one
Present embodiments provide a kind of control method of VRF Air Conditioning System, as shown in Figure 1, this VRF Air Conditioning System comprises an outer machine 1 and multiple interior machine 2, outer machine 1 comprises four-way change-over valve 10, gas-liquid separator 11, compressor 12, oil eliminator 13, outer machine heat exchanger 14, check valve 15, capillary 16, magnetic valve 17 and electric expansion valve 18, each interior machine 2 includes interior machine heat exchanger 20, main electric expansion valve 21 and auxiliary electron expansion valve 22, wherein, main electric expansion valve 21 is positioned on the liquid pipe that is connected with machine heat exchanger 20, auxiliary electron expansion valve 22 is positioned on the tracheae that is connected with machine heat exchanger 20, for regulating the flow of refrigerant in described tracheae.
When air-conditioner set is in refrigeration mode, as shown in Figure 1, low pressure refrigerant in tracheae enters gas-liquid separator 11 through four-way change-over valve 10, enter compressor 12 afterwards to compress, high-pressure gaseous refrigerant after compression enters oil eliminator 13 and carries out oil content, after enter outer machine heat exchanger 14 through four-way change-over valve 10, and be condensed into highly pressurised liquid refrigerant, condensed high-pressure liquid refrigerant enters liquid-in pipe through check valve 15, is assigned to machine 2 in each afterwards.Wherein, the isolated oil of oil eliminator 13 is back to the import of gas-liquid separator 11 after capillary 16 and magnetic valve 17.
High-pressure liquid refrigerant to be assigned in each after machine 2, for machine 2 in running order, as shown in Fig. 1 and 2 a, high-pressure liquid refrigerant enters interior machine heat exchanger 20 after the throttling of main electric expansion valve 21, high-pressure liquid refrigerant evaporation is low-pressure gaseous refrigerant afterwards, and low-pressure gaseous refrigerant enters tracheae through auxiliary electron expansion valve 22.Wherein, when interior machine 2 is in refrigeration work state, auxiliary electron expansion valve 22 aperture standard-sized sheet.
When air-conditioner set is in heating mode, equally for machine 2 in running order, as shown in Fig. 1 and 2 b, high-pressure gaseous refrigerant in tracheae enters interior machine heat exchanger 20 through auxiliary electron expansion valve 22 and is condensed into highly pressurised liquid refrigerant, and condensed high-pressure liquid refrigerant flows in liquid-in pipe through interior owner's electric expansion valve 21.Highly pressurised liquid refrigerant in liquid pipe enters outer machine heat exchanger 14 and evaporates after the throttling of outer organic electronic expansion valve 18, low pressure refrigerant enters gas-liquid separator 11 through four-way change-over valve 10 afterwards, enter compressor 12 afterwards to compress, high-pressure gaseous refrigerant after compression enters oil eliminator 13 and carries out oil content, after enter tracheae through four-way change-over valve 10 and be assigned to machine 2 in each.Wherein, when interior machine 2 be in heat duty time, auxiliary electron expansion valve 22 and main electric expansion valve 21 aperture standard-sized sheet.
The flow chart of the control method of the VRF Air Conditioning System that the present embodiment provides, as shown in Figure 3, comprising:
S101: judge whether running time is greater than the very first time;
Air-conditioner set has just been started shooting and compressor just brings into operation time, the refrigerant in air-conditioner set does not enter normal operating conditions, therefore, needs to run after a period of time, then judges whether air-conditioner set lacks refrigerant.Wherein, the scope of the very first time is 10min ~ 15min.
If be less than the very first time, then do not perform any operation, after the Preset Time of interval running time of air-conditioner set, continue to judge whether running time is greater than the very first time, if running time is greater than the very first time, then can enter follow-up determining step, i.e. step S102.
S102: judge whether that there is idle interior machine;
By carrying out data interaction with the main control chip of air-conditioner set, can judge whether VRF Air Conditioning System has idle interior machine, if do not had, then after the Preset Time of interval, continue to judge whether that there is idle interior machine, if had, then enter step S103.
S103: the operational mode judging described air-conditioner set;
If the operational mode of described air-conditioner set is refrigeration mode, enter step S104, if the operational mode of described air-conditioner set is heating mode, enter step S108.
S104: obtain the aperture of the main electric expansion valve of the interior machine of work, interior machine environment temperature and interior machine heat exchanger temperature;
In the present embodiment, the aperture of main electric expansion valve is obtained by the data interaction of the control chip with main electric expansion valve, by be arranged on the temperature-sensitive bag of interior machine air inlet or temperature sensor etc. obtain in environment temperature residing for machine, by be arranged on temperature-sensitive bag in the middle part of interior machine heat exchanger or temperature sensor etc. obtain in machine heat exchanger temperature.
S105: judge whether the aperture of the main electric expansion valve of the interior machine of work is more than or equal to first threshold, and whether the value that interior machine environment temperature deducts interior machine heat exchanger temperature is less than or equal to Second Threshold;
When air-conditioner set is in refrigeration mode, record and preserve the aperture of the main electric expansion valve of the interior machine of work, temperature in the middle part of interior machine heat exchanger temperature and heat exchanger and interior machine environment temperature and the indoor environment temperature residing for described interior machine, and judge whether the aperture of main electric expansion valve is more than or equal to first threshold, the scope of described first threshold is 3 DEG C ~ 5 DEG C, whether the value that interior machine environment temperature deducts interior machine heat exchanger temperature is less than or equal to Second Threshold, the scope of described Second Threshold is 96% ~ 100%, if the two is set up simultaneously, if namely the aperture of main electric expansion valve is more than or equal to first threshold, and the value that interior machine environment temperature deducts interior machine heat exchanger temperature is less than or equal to Second Threshold, then illustrate in air-conditioner set and lack refrigerant, now, step S106 can be entered, if set up when the two is different, then after the first Preset Time, enter the parameter of the step S104 interior machine of writing task again, and rejudge two conditions and whether set up simultaneously, if the two is set up simultaneously, enter step S106.
S106: the main electric expansion valve of idle interior machine is adjusted to the first aperture;
S107: the auxiliary electron expansion valve of idle interior machine is adjusted to the second aperture;
When air-conditioner set is in refrigeration mode and lacks refrigerant, first the main electric expansion valve of idle interior machine is adjusted to the first aperture, then the auxiliary electron expansion valve of idle interior machine is adjusted to the second aperture, wherein, the scope of described first aperture is 20% ~ 25%, the scope of described second aperture is 30% ~ 50%, now, high pressure refrigerant in liquid pipe enters in interior machine heat exchanger through main electric expansion valve throttling, refrigerant pressure after throttling is greater than the pressure of the refrigerant be detained in the interior machine that do not work, thus can promote to be detained machine heat exchanger in refrigerant outflow, tracheae is entered after the further throttling of auxiliary electron expansion valve becomes gas-liquid two-phase state, then gas-liquid separator is entered through four-way change-over valve, participate in the circulation of refrigerant.
And, after the main electric expansion valve regulating current idle interior machine and auxiliary electron expansion valve, after the second Preset Time, also need to return S102, rejudge VRF Air Conditioning System and whether there is idle interior machine, in case during this period of time there is new idle interior machine, air-conditioner set is made to lack refrigerant.
S108: obtain the aperture of the electric expansion valve of outer machine, outer machine environment temperature and outer machine heat exchanger temperature;
In the present embodiment, the aperture of electric expansion valve is obtained by the control chip of outer organic electronic expansion valve, environment temperature residing for outer machine is obtained, by being arranged on the outer machine heat exchanger temperature of acquisition such as temperature-sensitive bag in the middle part of outer machine heat exchanger or temperature sensor by being arranged on the temperature-sensitive bag of outer machine air inlet or temperature sensor etc.
S109: judge whether the aperture of the electric expansion valve of outer machine is more than or equal to the 3rd threshold value, and whether the value that outer machine environment temperature deducts outer machine heat exchanger temperature is less than or equal to the 4th threshold value;
When air-conditioner set is in heating mode, record and preserve the aperture of the electric expansion valve of outer machine, outer machine heat exchanger temperature and the outer machine environment temperature outdoor environment temperature namely residing for outer machine, and judge whether the aperture of electric expansion valve is more than or equal to the 3rd threshold value, whether the value that outer machine environment temperature deducts outer machine heat exchanger temperature is less than or equal to the 4th threshold value, wherein, the scope of described 3rd threshold value is 3 DEG C ~ 5 DEG C, and the scope of described 4th threshold value is 96% ~ 100%.If the two is set up simultaneously, then illustrate in air-conditioner set and lack refrigerant, now, can step S110 be entered, if asynchronously set up, then, after the first Preset Time, enter the parameter that step S108 obtains outer machine again, and rejudge, if the two is set up simultaneously, enter step S110.Wherein, the first Preset Time can set according to demand, and to this, the time does not limit in the present invention.
S110: the auxiliary electron expansion valve of idle interior machine is adjusted to the 3rd aperture;
S111: the main electric expansion valve of described idle interior machine is adjusted to the 4th aperture.
When air-conditioner set is in heating mode and lacks refrigerant, first the auxiliary electron expansion valve of idle interior machine is adjusted to the 3rd aperture, then the main electric expansion valve of idle interior machine is adjusted to the 4th aperture, wherein, the scope of described 3rd aperture is 15% ~ 20%, and the scope of described 4th aperture is 20% ~ 25%.Now, tracheae mesohigh refrigerant enters in interior machine heat exchanger through auxiliary electron expansion valve, machine heat exchanger in the refrigerant that high pressure refrigerant promotes to be detained in idle interior machine flows out, the laggard liquid-in pipe of gas-liquid two-phase state is become through main electric expansion valve throttling, enter outer machine heat exchanger through outer organic electronic expansion valve to evaporate, participate in the circulation of air-conditioner set refrigerant.
And, after the auxiliary electron expansion valve regulating current idle interior machine and main electric expansion valve, after the second Preset Time, also need to return S102, rejudge VRF Air Conditioning System and whether there is idle interior machine, in case during this period of time there is new idle interior machine, air-conditioner set is made to lack refrigerant.Wherein, the second Preset Time can set according to demand, and to this, the time does not limit in the present invention.
In the present embodiment, idle interior machine can be one, also can be multiple.When idle interior machine only has one, only need open main electric expansion valve and the auxiliary electron expansion valve of this interior machine that do not work, when idle interior machine is multiple, first open main electric expansion valve and the auxiliary electron expansion valve of machine in one of them, then repeat to judge whether air-conditioner set lacks refrigerant, if still lack refrigerant, then open second interior machine, if when judged result is not for lacking refrigerant, then other interior machine can not be opened.
The control method of the VRF Air Conditioning System that the present embodiment provides, when VRF Air Conditioning System has idle interior machine, the judgment mode lacking refrigerant is determined according to the operational mode of air-conditioner set, if be namely in refrigeration mode, then judge whether system lacks refrigerant according to the parameter of machine in work, if be in heating mode, then judge whether system lacks refrigerant according to the parameter of outer machine, then when air-conditioner set lacks refrigerant, open main electric expansion valve and the auxiliary electron expansion valve of idle interior machine, the refrigerant be trapped in idle interior machine is flowed out, participate in the circulation of air-conditioner set refrigerant, the reliability of compressor is improved with this, guarantee the operation reliably and with long-term of air-conditioner set.
Embodiment two
Present embodiments provide a kind of control system of VRF Air Conditioning System, be applied to the VRF Air Conditioning System that embodiment one provides, its structure chart as shown in Figure 4, comprises the first judge module 401, second judge module 402, acquisition module 403, the 3rd judge module 404 and adjustment module 405.
First judge module 401, for judging whether VRF Air Conditioning System has idle interior machine, if had, then produces the first control instruction and is sent to the second judge module 402;
Second judge module 402, for receiving described first control instruction, and judge the operational mode of described air-conditioner set, if be in refrigeration mode, then produce the second control instruction and be sent to acquisition module 403, if be in heating mode, then produce the 3rd control instruction and be sent to acquisition module 403;
Acquisition module 403, for after receiving described second control instruction, the main electronic expansion valve opening of the interior machine of acquisition work, interior machine environment temperature and interior machine heat exchanger temperature, and the data of acquisition are sent to the 3rd judge module 404, or after receiving described 3rd control instruction, the electronic expansion valve opening obtaining outer machine is, outer machine environment temperature and outer machine heat exchanger temperature, and the data of acquisition is sent to described 3rd judge module 404;
3rd judge module 404, for after receiving the data, judge whether the main electronic expansion valve opening of the interior machine of work is more than or equal to first threshold and whether the value that the interior machine environment temperature of work deducts interior machine heat exchanger temperature is less than or equal to Second Threshold, if, then produce the 4th control instruction and be sent to adjustment module 405, or judge whether the aperture of the electric expansion valve of outer machine is more than or equal to the 3rd threshold value and whether the value that outer machine environment temperature deducts outer machine heat exchanger temperature is less than or equal to the 4th threshold value, if, then produce the 5th control instruction and be sent to adjustment module 405,
Adjustment module 405, for after receiving described 4th control instruction, the main electric expansion valve of idle interior machine is adjusted to the first aperture, and the auxiliary electron expansion valve of described idle interior machine is adjusted to the second aperture, or after receiving described 5th control instruction, the auxiliary electron expansion valve of idle interior machine is adjusted to the 3rd aperture, and the main electric expansion valve of described idle interior machine is adjusted to the 4th aperture.
In addition, adjustment module 405 is also for after being adjusted to the second aperture or the main electric expansion valve of described idle interior machine is adjusted to the 4th aperture by the auxiliary electron expansion valve of described idle interior machine, produce the 6th control instruction and be sent to described first judge module 401, after the second Preset Time, rejudging VRF Air Conditioning System to make described first judge module 401 and whether there is idle interior machine.
The control system that the present embodiment provides, also comprise: the 4th judge module, for judging whether the running time of VRF Air Conditioning System is greater than the very first time, if, then produce the 6th control instruction and be sent to described first judge module, to judge whether described air-conditioner set exists idle interior machine, wherein, the scope of the described very first time is 10min ~ 15min.
In the present embodiment, the scope of described first threshold is 3 DEG C ~ 5 DEG C, and the scope of described Second Threshold is 96% ~ 100%; The scope of described first aperture is 20% ~ 25%, and the scope of described second aperture is 30% ~ 50%; The scope of described 3rd threshold value is 3 DEG C ~ 5 DEG C, and the scope of described 4th threshold value is 96% ~ 100%; The scope of described 3rd aperture is 15% ~ 20%, and the scope of described 4th aperture is 20% ~ 25%.But the present invention is not limited only to this, namely in other embodiments of the invention, can limit according to the value of actual conditions to first threshold ~ the 4th threshold value and the first aperture ~ the 4th aperture.
The control system of the VRF Air Conditioning System that the present embodiment provides, when VRF Air Conditioning System has idle interior machine, the judgment mode lacking refrigerant is determined according to the operational mode of air-conditioner set, if be namely in refrigeration mode, then judge whether system lacks refrigerant according to the parameter of machine in work, if be in heating mode, then judge whether system lacks refrigerant according to the parameter of outer machine, then when air-conditioner set lacks refrigerant, open main electric expansion valve and the auxiliary electron expansion valve of idle interior machine, the refrigerant be trapped in idle interior machine is flowed out, participate in the circulation of air-conditioner set refrigerant, the reliability of compressor is improved with this, guarantee the operation reliably and with long-term of air-conditioner set.
In this description, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. the control method of a VRF Air Conditioning System, it is characterized in that, the multiple interior machine that described VRF Air Conditioning System comprises an outer machine and is connected with described outer machine, described interior machine comprises interior machine heat exchanger, main electric expansion valve and auxiliary electron expansion valve, wherein, described control method comprises:
Judge whether VRF Air Conditioning System has idle interior machine;
If had, judge the operational mode of described air-conditioner set;
If be in refrigeration mode, obtain the aperture of the main electric expansion valve of the interior machine of work, interior machine environment temperature and interior machine heat exchanger temperature; Judge whether the aperture of described main electric expansion valve is more than or equal to first threshold, and whether the value that environment temperature residing for described interior machine deducts interior machine heat exchanger temperature is less than or equal to Second Threshold; If, then the main electric expansion valve of idle interior machine is adjusted to the first aperture, and the auxiliary electron expansion valve of described idle interior machine is adjusted to the second aperture, if not, then after the first Preset Time, obtain the aperture of the main electric expansion valve of the interior machine of work, interior machine environment temperature and interior machine heat exchanger temperature;
If be in heating mode, obtain the aperture of the electric expansion valve of outer machine, outer machine environment temperature and outer machine heat exchanger temperature; Judge whether the aperture of described electric expansion valve is more than or equal to the 3rd threshold value, and whether the value that described outer machine environment temperature deducts outer machine heat exchanger temperature is less than or equal to the 4th threshold value; If, then the auxiliary electron expansion valve of idle interior machine is adjusted to the 3rd aperture, and the main electric expansion valve of described idle interior machine is adjusted to the 4th aperture, if not, then after the first Preset Time, obtain the aperture of the electric expansion valve of outer machine, outer machine environment temperature and outer machine heat exchanger temperature.
2. method according to claim 1, is characterized in that, also comprises:
Judge whether the running time of VRF Air Conditioning System is greater than the very first time, if so, then judge whether described air-conditioner set exists idle interior machine, the scope of the described very first time is 10min ~ 15min.
3. method according to claim 2, is characterized in that, after the auxiliary electron expansion valve of described idle interior machine being adjusted to the second aperture or the main electric expansion valve of described idle interior machine being adjusted to the 4th aperture, also comprises:
After the second Preset Time, rejudge VRF Air Conditioning System and whether there is idle interior machine.
4. according to the method in claim 2 or 3, it is characterized in that, the scope of described first threshold is 3 DEG C ~ 5 DEG C, and the scope of described Second Threshold is 96% ~ 100%; The scope of described first aperture is 20% ~ 25%, and the scope of described second aperture is 30% ~ 50%.
5. method according to claim 4, is characterized in that, the scope of described 3rd threshold value is 3 DEG C ~ 5 DEG C, and the scope of described 4th threshold value is 96% ~ 100%; The scope of described 3rd aperture is 15% ~ 20%, and the scope of described 4th aperture is 20% ~ 25%.
6. the control system of a VRF Air Conditioning System, it is characterized in that, the multiple interior machine that described VRF Air Conditioning System comprises an outer machine and is connected with described outer machine, described interior machine comprises interior machine heat exchanger, main electric expansion valve and auxiliary electron expansion valve, wherein, described control system comprises:
First judge module, for judging whether VRF Air Conditioning System has idle interior machine, if had, then produces the first control instruction and is sent to the second judge module;
Second judge module, for receiving described first control instruction, and judges the operational mode of described air-conditioner set, if be in refrigeration mode, then produce the second control instruction and be sent to acquisition module, if be in heating mode, then produce the 3rd control instruction and be sent to acquisition module;
Acquisition module, for after receiving described second control instruction, the aperture of the main electric expansion valve of the interior machine of acquisition work, interior machine environment temperature and interior machine heat exchanger temperature, and the data of acquisition are sent to the 3rd judge module, or after receiving described 3rd control instruction, obtain the aperture of the electric expansion valve of outer machine, outer machine environment temperature and outer machine heat exchanger temperature, and the data of acquisition are sent to described 3rd judge module;
3rd judge module, for after receiving the data, judge whether the aperture of the main electric expansion valve of the interior machine of work is more than or equal to first threshold and whether the value that described interior machine environment temperature deducts interior machine heat exchanger temperature is less than or equal to Second Threshold, if, then produce the 4th control instruction and be sent to adjustment module, if not, then after Preset Time, produce the second control instruction and be sent to described acquisition module; Or described 3rd judge module after receiving the data, judge whether the aperture of the electric expansion valve of outer machine is more than or equal to the 3rd threshold value and whether the value that described outer machine environment temperature deducts outer machine heat exchanger temperature is less than or equal to the 4th threshold value, if, then produce the 5th control instruction and be sent to adjustment module, if not, then after Preset Time, produce the 3rd control instruction and be sent to described acquisition module;
Adjustment module, for after receiving described 4th control instruction, the main electric expansion valve of idle interior machine is adjusted to the first aperture, and the auxiliary electron expansion valve of described idle interior machine is adjusted to the second aperture, or after receiving described 5th control instruction, the auxiliary electron expansion valve of idle interior machine is adjusted to the 3rd aperture, and the main electric expansion valve of described idle interior machine is adjusted to the 4th aperture.
7. system according to claim 6, is characterized in that, also comprises:
4th judge module, for judging whether the running time of VRF Air Conditioning System is greater than the very first time, if, then produce the 6th control instruction and be sent to described first judge module, to judge whether described air-conditioner set exists idle interior machine, the scope of the described very first time is 10min ~ 15min.
8. system according to claim 7, it is characterized in that, described adjustment module is also sent to described first judge module for generation of the 6th control instruction, rejudges VRF Air Conditioning System whether have idle interior machine to make described first judge module after the second Preset Time.
9. system according to claim 8, is characterized in that, the scope of described first threshold is 3 DEG C ~ 5 DEG C, and the scope of described Second Threshold is 96% ~ 100%; The scope of described first aperture is 20% ~ 25%, and the scope of described second aperture is 30% ~ 50%.
10. system according to claim 9, is characterized in that, the scope of described 3rd threshold value is 3 DEG C ~ 5 DEG C, and the scope of described 4th threshold value is 96% ~ 100%; The scope of described 3rd aperture is 15% ~ 20%, and the scope of described 4th aperture is 20% ~ 25%.
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