CN103486783B - Air-conditioner system and defrosting control method thereof - Google Patents
Air-conditioner system and defrosting control method thereof Download PDFInfo
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- CN103486783B CN103486783B CN201310446426.5A CN201310446426A CN103486783B CN 103486783 B CN103486783 B CN 103486783B CN 201310446426 A CN201310446426 A CN 201310446426A CN 103486783 B CN103486783 B CN 103486783B
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- 238000010257 thawing Methods 0.000 title claims abstract description 154
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 239000003507 refrigerant Substances 0.000 description 17
- 238000005192 partition Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 101100517651 Caenorhabditis elegans num-1 gene Proteins 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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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
- 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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/031—Sensor arrangements
- F25B2313/0315—Temperature sensors near the outdoor heat exchanger
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
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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
- F25B2500/00—Problems to be solved
- F25B2500/31—Low ambient temperatures
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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
- F25B2600/00—Control issues
- F25B2600/01—Timing
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2501—Bypass valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2507—Flow-diverting valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of air-conditioner system, comprise the compressor, cross valve, indoor heat exchanger, throttle part and the outdoor micro-channel parallel flow heat exchanger that are connected by pipe arrangement successively, described air-conditioner system also comprises bypass circulation and controls the control device of bypass circulation conducting or cross valve, one end of this bypass circulation is connected with the outlet of described outdoor microchannel advection heat exchanger, and the other end is connected with the outlet of described indoor heat exchanger; This control device is used for when judging that air-conditioner needs defrost, controls bypass circulation conducting and carries out bypass defrosting or control cross valve commutation carrying out the tangential defrost of cross valve.The invention also discloses a kind of defrosting control method of air-conditioner system.The present invention, by increasing bypass circulation in air-conditioner system, carries out bypass defrosting during low-temperature heating, is conducive to improving low-temperature heating capacity, and during defrost simultaneously, power generating ratio number of times, improves the defrosting efficiency of air-conditioner.
Description
Technical field
The present invention relates to air-conditioner technical field, particularly relate to a kind of air-conditioner system and defrosting control method thereof.
Background technology
Air-conditioner is when heating, and indoor temperature is high, and outside temperature is low.Because the temperature of outdoor heat exchanger declines, fin there will be condensation water; And outdoor heat exchanger is when temperature dropped to a certain extent, fin will starts frosting, even may freeze, and so heat exchanger channels will be caused to block, thus heating effect difference even not heat.When especially adopting micro-channel parallel flow heat exchanger as outdoor heat exchanger, frosting velocity during operation can be faster, defrosting time is longer, and capillary aperture that is constant or electric expansion valve is large not during owing to defrosting, refrigerant is caused to be trapped in the flat tube of bottom, refrigerant temperature in flat tube bottom this is lower than the refrigerant temperature in the flat tube of other positions, and therefore the frost that condenses in the flat tube of bottom of this micro-channel parallel flow heat exchanger is more difficult except clean, thus affects heating effect.
Summary of the invention
Main purpose of the present invention is to provide a kind of air-conditioner system and defrosting control method thereof, is intended to the defrosting efficiency improving air-conditioner system.
The invention provides a kind of air-conditioner system, comprise the compressor, cross valve, indoor heat exchanger, throttle part and the outdoor micro-channel parallel flow heat exchanger that are connected by pipe arrangement successively, described air-conditioner system also comprises bypass circulation and controls the control device of bypass circulation conducting or cross valve, one end of this bypass circulation is connected with the outlet of described outdoor microchannel advection, and the other end is connected with the outlet of described indoor heat exchanger; Described control device comprises:
Temperature acquisition module, when running the first preset time under heating mode for air-conditioner, obtains the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet; When bypass circulation disconnects, the number of times of record bypass defrosting, obtains the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger during defrost;
Control module, during for being less than or equal to the first temperature threshold T1 as temperature Tx, conducting bypass circulation, carries out bypass defrosting to air-conditioner, and disconnects bypass circulation when meeting bypass defrosting exit criteria; When the number of times of bypass defrosting reaches predetermined times or when minimum temperature Tz is less than the second temperature threshold T2, control cross valve commutation, the tangential defrost of cross valve is carried out to air-conditioner.
Preferably, described temperature acquisition module also for: obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube;
Described control module also for: when Tx-Ty is greater than the second temperature threshold T6, conducting bypass circulation, carries out bypass defrosting to air-conditioner; When temperature Ty is more than or equal to the 3rd temperature threshold T3, exit bypass defrosting.
Preferably, described control device also comprises timing module, for when conducting bypass circulation, and the running time of record record bypass defrosting;
Control module also for: when being greater than the second preset time the running time of described bypass defrosting, disconnect bypass circulation, exit bypass defrosting.
Preferably, described temperature acquisition module also for: obtain the current exhaust gas temperature Tp of compressor
n; During bypass circulation conducting after cross valve is tangential, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger when starting to obtain defrost; When disconnecting bypass circulation, obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet;
Described control module also for: as current exhaust gas temperature Tp
nbe less than the delivery temperature Tp of the last compressor obtained
n-1time, conducting bypass circulation; When temperature Tz is more than or equal to the 4th temperature threshold T4, disconnect bypass circulation; When temperature Tx is more than or equal to the 5th temperature threshold T5, exit the tangential defrost of cross valve.
Present invention also offers a kind of defrosting control method of air-conditioner system, described air-conditioner system is the air-conditioner system of said structure, and described control method comprises the following steps:
Under air-conditioner operation heating mode during the first preset time, obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet; Obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube;
When temperature Tx is less than the first temperature threshold T1, or when Tx-Ty is greater than the second temperature threshold T6, conducting bypass circulation, carries out bypass defrosting to air-conditioner, and disconnects bypass circulation when meeting bypass defrosting exit criteria;
When bypass circulation disconnects, the number of times of record bypass defrosting, or the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger when obtaining defrost;
When the number of times of bypass defrosting reaches predetermined times or minimum temperature Tz is less than the second temperature threshold T2, control cross valve commutation, the tangential defrost of cross valve is carried out to air-conditioner.
Preferably, the described bypass circulation that disconnects when meeting bypass defrosting exit criteria comprises:
Obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube;
When temperature Ty is more than or equal to the 3rd temperature threshold T3, exit bypass defrosting;
When temperature Ty is less than the 3rd temperature threshold T3, continue to obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube.
Preferably, the temperature Ty on the outdoor micro-channel parallel flow heat exchanger inlet tube of described acquisition comprises: the temperature Ty on the outdoor micro-channel parallel flow heat exchanger inlet tube of interval acquiring;
Described when temperature Ty is more than or equal to the 3rd temperature threshold T3, exit bypass defrosting and comprise: temperature Ty is continuous when being all more than or equal to the 3rd temperature threshold T3 b time, exits bypass defrosting.
Preferably, also comprise before the temperature Ty on the outdoor micro-channel parallel flow heat exchanger inlet tube of described acquisition:
The running time of record bypass defrosting;
When being less than or equal to the second preset time the running time of described bypass defrosting, obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube;
When being greater than the second preset time the running time of described bypass defrosting, disconnecting bypass circulation, exiting bypass defrosting.
Preferably, under described air-conditioner operation heating mode during the first preset time, start to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet, temperature Ty on inlet tube comprises: under air-conditioner operation heating mode during the first preset time, temperature Tx on the outlet of outdoor micro-channel parallel flow heat exchanger described in interval acquiring; Interval acquiring obtains the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube;
Described when temperature Tx is less than the first temperature threshold T1, conducting bypass circulation comprises: when temperature Tx is continuous be all less than the first temperature threshold T1 a time time, conducting bypass circulation, wherein a is natural number;
During described acquisition defrost, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger comprises: the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger described in interval acquiring;
When described minimum temperature Tz is less than the second temperature threshold T2, control cross valve commutate, the tangential defrost of cross valve is carried out to air-conditioner and comprises: when temperature Tz is continuous be all less than the second temperature threshold T2 m time time, control cross valve commutate, carry out the tangential defrost of cross valve to air-conditioner, wherein m is natural number.
Preferably, described control cross valve commutation, also comprises while carrying out the tangential defrost of cross valve to air-conditioner:
Obtain the current exhaust gas temperature Tp of compressor
n;
As current exhaust gas temperature Tp
nbe less than the delivery temperature Tp of the last compressor obtained
n-1time, conducting bypass circulation;
Obtain the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger during defrost;
When temperature Tz is more than or equal to the 4th temperature threshold T4, disconnect bypass circulation;
When temperature Tz is less than the 4th temperature threshold T4, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger when continuing to obtain defrost;
When disconnecting bypass circulation, obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet;
When temperature Tx is more than or equal to the 5th temperature threshold T5, exit the tangential defrost of cross valve, and the number of times of bypass defrosting resets;
When temperature Tx is less than the 5th temperature threshold T5, continue to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet.
The present invention, by increasing bypass circulation in air-conditioner system, carries out bypass defrosting during low-temperature heating, is conducive to improving low-temperature heating capacity, and during defrost simultaneously, power generating ratio number of times, improves microchannel parallel pipeline heat exchanger air-conditioner comfort level.And, a tangential defrost of cross valve is carried out every n bypass defrosting cycle, open by-passing valve simultaneously, refrigerant is made to enter into every root flat tube on micro-channel parallel flow heat exchanger more uniformly, frost on removing heat exchanger that can be rapid and clean, the clean frost of avoiding has influence on next cycle heat exchanger heat exchanger, improves air-conditioner system low-temperature heating capacity to a certain extent.
Accompanying drawing explanation
Fig. 1 is the structural representation of air-conditioner system preferred embodiment of the present invention;
Fig. 2 is the structural representation of outdoor micro-channel parallel flow heat exchanger in Fig. 1;
Fig. 3 is the schematic flow sheet of defrosting control method first embodiment of air-conditioner system of the present invention;
Fig. 4 is that the refrigerant that the air-conditioner system shown in Fig. 1 carries out bypass defrosting in a heating mode flows to schematic diagram;
Fig. 5 is that the refrigerant that the air-conditioner system shown in Fig. 1 carries out the tangential defrost of cross valve in a heating mode flows to schematic diagram;
Fig. 6 is the schematic flow sheet judging the embodiment whether bypass defrosting exits in the defrosting control method of air-conditioner system of the present invention;
Fig. 7 is the schematic flow sheet judging another embodiment whether bypass defrosting exits in the defrosting control method of air-conditioner system of the present invention;
Fig. 8 is the schematic flow sheet of defrosting control method second embodiment of air-conditioner system of the present invention;
Fig. 9 is that the air-conditioner system described in Fig. 1 carries out the tangential defrost of cross valve and flows to schematic diagram in conjunction with refrigerant during bypass defrosting;
Figure 10 is the high-level schematic functional block diagram of control device first embodiment in air-conditioner system of the present invention;
Figure 11 is the high-level schematic functional block diagram of control device second embodiment in air-conditioner system of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Technical scheme of the present invention is further illustrated below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to Fig. 1, propose a kind of micro-channel parallel flow heat exchanger air-conditioner system, air-conditioner system comprises indoor unit and outdoor unit, indoor unit and outdoor unit form loop by pipeline communication, cold-producing medium runs in the loop, realize indoor unit and outdoor unit heat exchange, thus the refrigeration reaching air-conditioning, the object that heats.
Wherein indoor unit comprises indoor heat exchanger 3 and indoor fan 4, and the entrance and exit of indoor heat exchanger 3 is communicated with outdoor unit respectively by pipeline.Outdoor unit comprises equally by compressor 1, cross valve 2, throttle part 5, magnetic valve 6, outdoor micro-channel parallel flow heat exchanger 8, the outdoor fan 9 of pipeline communication.Throttle part 5 is connected in the pipeline between outdoor micro-channel parallel flow heat exchanger 8 and indoor heat exchanger 3.The exhaust outlet of compressor 1 is connected with the interface c of cross valve 2, and the gas returning port of compressor 1 is connected with the interface a of cross valve 2, and outdoor micro-channel parallel flow heat exchanger 8 is connected with the interface b of cross valve 2, and indoor heat exchanger 3 is connected with the interface d of cross valve.And, between outdoor micro-channel parallel flow heat exchanger 8 and indoor heat exchanger 3, be provided with a bypass circulation.In the present embodiment, this bypass circulation comprises magnetic valve 6, and one end of this magnetic valve 6 is connected with the outlet of outdoor micro-channel parallel flow heat exchanger 8, and the other end is connected with the outlet of indoor heat exchanger 3.It should be noted that: the outdoor micro-channel parallel flow heat exchanger mentioned in the embodiment of the present invention and the inlet tube of indoor heat exchanger, outlet are all with air-conditioner system refrigerant flow direction definition in cooling mode.
In conjunction with reference Fig. 2, above-mentioned micro-channel parallel flow heat exchanger 8 comprises input pipe 801, left header 802, right header 803, flat tube 804, fin 805, distributor 806, isocon 807,808,809, partition 810, distributor 811, outlet manifold 813,814, outlet 812, end cap 815.In usual low-temperature heating situation, after cold-producing medium enters distributor 811 by outlet 812, microchannel flat shape stream heat exchanger 8 is entered respectively again through outlet manifold 813,814, and enter distributor 806 after flowing through the flat tube between partition 810 and end cap 815 and carry out secondary distribution, then carry out double evaporation-cooling heat exchange respectively through the flat tube that distributing pipe 807,808,809 enters partition more than 810.In normal defrost situation; the flow direction of cold-producing medium is just contrary to the above; the flat pipe heat exchanger that cold-producing medium enters into partition more than 810 by inlet tube 801 enters into isocon 807,808,809 and converges to distributor 806, and then enters into the flat tube of partition less than 810.Usually due to the existence of throttle part 5, lower in the flat tube inner refrigerant temperature near 810 during defrost, likely lower than the temperature of outlet 812 inner refrigerant.
Therefore, the air-conditioner system of the embodiment of the present invention adds bypass circulation, and coordinates corresponding defrosting control method, to improve the defrost efficiency of air-conditioner system.Particularly, with reference to Fig. 3, defrosting control method first embodiment of air-conditioner system of the present invention is proposed.Defrosting control method in this embodiment comprises the following steps:
When step S110, air-conditioner run the first preset time with heating mode, obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet 812, obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube 801;
In air-conditioner system shown in Fig. 1, outlet 812 place of outdoor micro-channel parallel flow heat exchanger 8 is provided with the first temperature sensor 101, is provided with three-temperature sensor 103 at inlet tube 801 place of outdoor micro-channel parallel flow heat exchanger 8.First temperature sensor 101 is for the temperature Tx on the outlet 812 of micro-channel parallel flow heat exchanger outside sensing chamber 8, and three-temperature sensor 103 is for the temperature Ty on the inlet tube 801 of micro-channel parallel flow heat exchanger outside sensing chamber 8.In addition, in air-conditioner system, also will timer be set, carry out timing for the running time run in a heating mode air-conditioner.When air-conditioner starts with heating mode, this timer triggers and starts, to record air-conditioner running time in a heating mode.When the time that timer records reaches the first preset time, by the temperature Tx detected by acquisition first temperature sensor 101, obtain the temperature Ty detected by three-temperature sensor 103.
Step S120, judge whether Tx is less than the first temperature threshold T1 or Tx-Ty and whether is greater than the 6th temperature threshold T6; Proceed to step S130; Otherwise proceed to step S110;
Judge whether Tx is less than the first temperature threshold T1 or Tx-Ty and whether is greater than the 6th temperature threshold T6, to judge whether air-conditioner system enters defrost.In order to the maloperation preventing the exception of temperature from making air-conditioner system defrost, will air-conditioner system run in a heating mode the first preset time N1 time, temperature Tx on the outlet 812 of the outdoor micro-channel parallel flow heat exchanger 8 that interval acquiring first temperature sensor 101 detects, if this temperature Tx is continuous be all less than the first temperature threshold T1 for a time, then proceed to step S130; Otherwise continue to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet 812.Or air-conditioner system run in a heating mode the first preset time N1 time, temperature Ty on the inlet tube 801 of the outdoor micro-channel parallel flow heat exchanger that the temperature Tx on the outlet 812 of the outdoor micro-channel parallel flow heat exchanger 8 that interval acquiring first temperature sensor 101 detects and interval acquiring three-temperature sensor 103 detect, if this temperature Tx-Ty is continuous be all greater than the 6th temperature threshold T6 for a time, then proceed to step S130; Otherwise continue the temperature Tx obtained on outdoor micro-channel parallel flow heat exchanger the outlet 812 and temperature Ty continued on the outdoor micro-channel parallel flow heat exchanger inlet tube 801 of acquisition.
Step S130, conducting bypass circulation, carry out bypass defrosting to air-conditioner, and disconnect bypass circulation when meeting bypass defrosting exit criteria;
When judging to need defrost, Controlling solenoid valve 6 is opened, with conducting bypass circulation.As shown in Figure 4, the cold-producing medium of the exhaust outlet of compressor 1 will be divided into two-way after cross valve c interface, d interface, one road flow through indoor heat exchanger 3, throttle part 5 laggard enter outdoor micro-channel parallel flow heat exchanger 8, another road flows through bypass circulation and enters outdoor micro-channel parallel flow heat exchanger 8, then flowed out by outdoor micro-channel parallel flow heat exchanger 8, and get back in compressor 1 through the b interface of cross valve, a interface, form the closed circuit of cold-producing medium.When carrying out bypass defrosting, meeting once defrost exit criteria, then disconnecting bypass circulation.
Step S140, when bypass circulation disconnects, the frequency n of record bypass defrosting, or the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger 8 when obtaining defrost;
In air-conditioner system shown in Fig. 1, the position that during defrost, the temperature of outdoor micro-channel parallel flow heat exchanger is minimum arranges the second temperature sensor.As previously mentioned, the temperature of the cold-producing medium of flat tube during defrost near partition 810 is lower.Then this second temperature sensor can be arranged on the flat tube place near the partition 810, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger 8 during to detect defrost.In addition, above-mentioned air-conditioner system can also arrange counter, to count bypass defrosting number of times.When bypass circulation disconnects, counter carries out counting n=n+1 to this bypass defrosting number of times.Meanwhile, when bypass circulation disconnects, also by the minimum temperature Tz of the outdoor micro-channel parallel flow heat exchanger 8 detected by acquisition second temperature sensor, and store.
Step S150, judge whether the frequency n of bypass defrosting reaches predetermined times num; Proceed to step S160; Otherwise proceed to step S110;
At the end of bypass defrosting, will judge whether the number of times of the bypass defrosting counted reaches predetermined times num, when bypass defrosting number of times does not reach num, then proceeds bypass defrosting, returns step S110.
Step S160, judge whether the minimum temperature Tz at the end of n-th um-1 time bypass defrosting is less than the second temperature threshold T2, is proceed to step S170; Otherwise proceed to step S180;
When bypass defrosting number of times reaches num, then the minimum temperature Tz obtained at the end of judging num-1 bypass defrosting, and judge whether this minimum temperature Tz is less than the second temperature threshold T2, when Tz is less than the second temperature threshold T2, proceed to step S170; Otherwise proceed to step S180.In order to the maloperation preventing the exception of temperature from making air-conditioner system defrost, will when bypass circulation disconnects, by the minimum temperature Tz of the outdoor micro-channel parallel flow heat exchanger 8 that interval acquiring second temperature sensor detects, if the minimum temperature Tz at the end of this num-1 time bypass defrosting is continuous be all less than the second temperature threshold T2 for m time, then proceed to step S170.
Step S170, control cross valve 2 commutate, and carry out the tangential defrost of cross valve to air-conditioner.
If bypass defrosting number of times reaches predetermined times num and at the end of num-1 bypass defrosting, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger is less than the second temperature threshold T2, then control cross valve 2 and commutate, the tangential defrost of cross valve is carried out to air-conditioner.As shown in Figure 5, after the refrigerant of the exhaust outlet of compressor 1 flows through outdoor micro-channel parallel flow heat exchanger 8, throttle part 5, indoor heat exchanger 3 after cross valve c interface, b interface, get back in compressor 1 by the d interface of cross valve, a interface again, form the closed circuit of refrigerant.
Step S180, enter normal heating mode, time when again running with heating mode air-conditioner system is carried out timing by timer, n=0; And return step S110.
If at the end of judgement bypass defrosting, the bypass defrosting frequency n of having carried out reaches predetermined times num and at the end of n-th um-1 time bypass defrosting, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger is more than or equal to the second temperature threshold T2, represent that the frost in air-conditioner system has been changed totally, the tangential defrost of cross valve need not be entered.Now, control air-conditioner being entered normal heating mode, again to carrying out timing the running time of heating mode, and after bypass defrosting frequency n before being reset, returning step S110.
The present invention, by increasing bypass circulation in air-conditioner system, carries out bypass defrosting during low-temperature heating, is conducive to improving low-temperature heating capacity, and during defrost simultaneously, power generating ratio number of times, improves microchannel parallel pipeline heat exchanger air-conditioner comfort level.And, when bypass defrosting is unclean, carry out a tangential defrost of cross valve, open by-passing valve simultaneously, refrigerant is made to enter into every root flat tube on micro-channel parallel flow heat exchanger more uniformly, frost on removing heat exchanger that can be rapid and clean, the clean frost of avoiding has influence on next cycle heat exchanger, improves air-conditioner system low-temperature heating capacity to a certain extent.
Further, with reference to Fig. 6, the bypass circulation that disconnects when meeting bypass defrosting exit criteria in above-mentioned steps 130 comprises:
Step S131a, the temperature Ty obtained on outdoor micro-channel parallel flow heat exchanger inlet tube 801;
In air-conditioner system shown in Fig. 1, the inlet tube 801 of outdoor micro-channel parallel flow heat exchanger arranges three-temperature sensor 103, and this three-temperature sensor 103 is for the temperature Ty on micro-channel parallel flow heat exchanger inlet tube 801 outside sensing chamber.When after bypass circulation conducting, the temperature Ty detected by this three-temperature sensor will be obtained.
Step S132a, judge whether Ty is more than or equal to the 3rd temperature threshold T3; When Ty is more than or equal to the 3rd temperature threshold T3, proceed to step S133a; When Ty is less than the 3rd temperature threshold T3, proceed to step S131a;
Judge whether Ty is more than or equal to the 3rd temperature threshold T3, to judge whether to exit bypass defrosting.In order to the maloperation preventing the exception of temperature from making air-conditioner system defrost, will after bypass circulation conducting, temperature Ty on the inlet tube 801 of the outdoor micro-channel parallel flow heat exchanger 8 that interval acquiring three-temperature sensor 103 detects, if this temperature Ty is continuous be all less than the 3rd temperature threshold T3 for b time, then proceed to step S131a; Otherwise proceed to step S133a.
Step S133a, exit bypass defrosting.
By the temperature Ty on micro-channel parallel flow heat exchanger inlet tube 801 outside sensing chamber in the present embodiment, and according to this temperature Ty, judge whether to exit bypass defrosting.
Further, with reference to Fig. 7, the bypass circulation that disconnects when meeting bypass defrosting exit criteria in above-mentioned steps 130 comprises:
The running time T M2 of step S131b, record bypass defrosting;
Timer in above-mentioned air-conditioner system, also when bypass defrosting starts, records the running time T M2 of bypass defrosting.
Step S132b, judge whether TM2 is less than or equal to the second preset time; When TM2 is less than or equal to the second preset time, proceed to step S133b; When TM2 is greater than the second preset time, proceed to step S135b;
Judge whether TM2 is less than or equal to the second preset time, to judge whether to exit bypass defrosting.
Step S133b, the temperature Ty obtained on outdoor micro-channel parallel flow heat exchanger inlet tube 801;
When TM2 is less than or equal to the second preset time, then obtain this temperature Ty detected by three-temperature sensor 103.
Step S134b, judge whether Ty is more than or equal to the 3rd temperature threshold T3; When Ty is more than or equal to the 3rd temperature threshold T3, proceed to step S135b; When Ty is less than the 3rd temperature threshold T3, proceed to step S133b;
Judge whether Ty is more than or equal to the 3rd temperature threshold T3, to judge whether to exit bypass defrosting.In order to the maloperation preventing the exception of temperature from making air-conditioner system defrost, will after bypass circulation conducting, temperature Ty on the inlet tube 801 of the outdoor micro-channel parallel flow heat exchanger 8 that interval acquiring three-temperature sensor 103 detects, if this temperature Ty is continuous be all less than the 3rd temperature threshold T3 for b time, then proceed to step S135b; Otherwise proceed to step S133b.
Step S135b, exit bypass defrosting.
In the present embodiment, not only according to the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube, but also the overlong time of bypass defrosting can be avoided and affect heating the time normally by arranging of the second preset time.
With reference to Fig. 8, defrosting control method second embodiment of air-conditioner system is proposed.Based on above-described embodiment, also comprise while step S170 in this embodiment:
The current exhaust gas temperature Tp of step S190, acquisition compressor
n;
In air-conditioner system shown in Fig. 1, be provided with the 4th temperature sensor 102 in the exhaust ports of compressor.When air-conditioner system enters the tangential defrost of cross valve, the delivery temperature Tp obtaining compressor 1 will be started
n.In the present embodiment, separated in time is carried out the acquisition of the delivery temperature of compressor, this interval time is obtained once every 5 seconds.
Step S200, judge Tp
nwhether be less than the delivery temperature Tp of the last compressor obtained
n-1, be proceed to step S210; Otherwise proceed to step S190;
Compare the delivery temperature of the front and back twice of obtained compressor, to judge whether to need conducting bypass circulation.
Step S210, conducting bypass circulation;
Work as Tp
nbe less than Tp
n-1time, then Controlling solenoid valve 6 is opened, thus conducting bypass circulation.As shown in Figure 9, the refrigerant of the exhaust outlet of compressor 1 through cross valve c interface, b interface laggard enter outdoor micro-channel parallel flow heat exchanger 8, and be divided into two-way after being flowed out by outdoor micro-channel parallel flow heat exchanger 8, one road flows through after throttle part 5 enters indoor heat exchanger, get back in compressor 1 by the d interface of cross valve, a interface again, form the closed circuit of refrigerant.Another road through bypass circulation, then is got back in compressor 1 by the d interface of cross valve, a interface, forms the closed circuit of refrigerant.
Step S220, obtain the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger;
After bypass circulation conducting, by the minimum temperature Tz of the outdoor micro-channel parallel flow heat exchanger detected by acquisition second temperature sensor.
Step S230, judge whether Tz is more than or equal to the 4th temperature threshold T4, when Tz is greater than the 4th temperature threshold, proceed to step S240; When Tz is less than the 4th temperature threshold T4, proceed to step S220;
Then judge whether Tz is greater than the 4th temperature threshold T4, to judge whether to disconnect bypass circulation.In order to the maloperation preventing the exception of temperature from making air-conditioner system defrost, will after bypass circulation conducting, the minimum temperature Tz of the outdoor micro-channel parallel flow heat exchanger 8 that interval acquiring second temperature sensor detects, if this temperature Tz is continuous be all more than or equal to the 4th temperature threshold T4 for c time, then proceed to step S240; Otherwise proceed to step S220.
Step S240, disconnection bypass circulation;
When Tz is more than or equal to the 4th temperature threshold T4, disconnect bypass circulation.When Tz is less than the 4th temperature threshold T4, then the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger when continuing to obtain defrost.
Step S250, the temperature Tx obtained on outdoor micro-channel parallel flow heat exchanger outlet 812;
After bypass circulation disconnects, then temperature Tx on the outlet 812 obtaining the outdoor micro-channel parallel flow heat exchanger 8 that the first temperature sensor 101 detects.
Step S260, judge whether Tx is more than or equal to the 5th temperature threshold T5, when Tx is more than or equal to the 5th temperature threshold T5, proceed to step S270; When Tx is less than the 5th temperature threshold T5, proceed to step S250;
Then judge whether Tx is more than or equal to the 5th temperature threshold T5, to judge whether that exiting cross valve switches defrost.In order to the maloperation preventing the exception of temperature from making air-conditioner system defrost, will after bypass circulation disconnects, temperature Tx on the outlet 812 of the outdoor micro-channel parallel flow heat exchanger 8 that interval acquiring first temperature sensor 101 detects, if this temperature Tx is continuous be all more than or equal to the first temperature threshold T5 for d time, then proceed to step S270; Otherwise proceed to step S250.
Step S270, exit the tangential defrost of cross valve, and proceed to step S180.
When Tx is more than or equal to the 5th temperature threshold T5, exits the tangential defrost of cross valve, enter normal heating mode, and the bypass defrosting frequency n of record is reset.When Tx is less than the 5th temperature threshold T5, continue to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet 812.
Correspondingly describe to the detailed process of above-mentioned air-conditioner system defrost below:
Air-conditioner system enters heating mode and runs, timing again after air-conditioner system running time T M1, bypass circulation running time T M2 reset, when air-conditioner system running time T M1 timing reaches the first preset time (such as, 10-15 minute) afterwards the first temperature sensor 101 of outdoor micro-channel parallel flow heat exchanger 8 start working, detected a temperature Tx every 20 seconds, then control module 202 judges that Tx meets Tx≤-3 DEG C whether continuous 9 times.When temperature Tx is continuous meet Tx≤-3 DEG C for 9 times after, bypass circulation is opened, and carries out bypass defrosting to air-conditioner.
When bypass defrosting runs, outdoor fan is closed, and indoor fan runs by anti-cold wind, and bypass circulation running time T M2 starts timing, and then control module judges whether TM2 is more than or equal to the defrosting time TM0 of standard, if TM2 >=TM0, then disconnects bypass circulation; If TM2<TM0, the then temperature Ty of three-temperature sensor 103 micro-channel parallel flow heat exchanger 8 outside 20 seconds sensing chamber, then control module 202 judges that temperature Ty is more than or equal to 5 DEG C whether continuous 3 times, if meet continuous 3 temperature Ty >=5 DEG C, then disconnect bypass circulation, otherwise continue the temperature Ty of micro-channel parallel flow heat exchanger 8 outside sensing chamber.When bypass circulation disconnects, then the minimum temperature Tz of the second temperature sensor micro-channel parallel flow heat exchanger 8 outside 20 seconds sensing chamber.
When bypass defrosting disconnects; control module 202 judges that bypass defrosting frequency n reaches predetermined times 6 times and at the end of judging the 5th bypass defrosting, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger is less than 3 DEG C; then control module 202 controls cross valve commutation; indoor and outdoor blower fan cuts out, and system enters normal defrost pattern.Now, the 4th temperature sensor 102 is by the delivery temperature Tpn every 5 seconds detection compressors, and the delivery temperature of twice compressor before and after control module 202 judges, when Tpn-Tpn-1≤0 DEG C, bypass circulation is opened.Then every 20 seconds, the second temperature sensor detects the minimum temperature Tz of off-premises station parallel-flow heat exchanger, and control module 202 judges that temperature Tz is more than or equal to 5 DEG C whether continuous 3 times, when temperature Tz >=5 DEG C, controls bypass circulation and closes.Then every 10 seconds, the temperature Tx of micro-channel parallel flow heat exchanger outside first temperature sensor 101 sensing chamber, control module 202 judges whether continuous 3 temperature T1 >=5 DEG C, when continuous 3 temperature T1 >=5 DEG C, then control air-conditioner to exit cross valve and tangentially to defrost end, air-conditioner system enters normal heating mode.
Accordingly, also comprise control device in above-mentioned air-conditioner system, this control device is turned on or off according to the tangential and bypass circulation of above-mentioned defrosting control method control cross valve.With reference to Figure 10, this control device comprises:
Temperature acquisition module 201, when running the first preset time under heating mode for air-conditioner, starts to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet 812, obtains the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube 801; When bypass circulation disconnects, obtain the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger during defrost;
Counting module 203, for when bypass circulation disconnects, the number of times of record bypass defrosting;
Control module 202, for being less than or equal to the first temperature threshold T1 as temperature Tx or when Tx-Ty is greater than the 6th temperature threshold T6, conducting bypass circulation, carries out bypass defrosting to air-conditioner, and disconnects bypass circulation when meeting bypass defrosting exit criteria; When the number of times of bypass defrosting reaches predetermined times and on minimum temperature Tz once at the end of bypass defrosting when being less than the second temperature threshold T2, control cross valve commutation, the tangential defrost of cross valve carried out to air-conditioner.
Said temperature acquisition module 201 for obtaining the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet 812 detected in the first temperature sensor 101 on air-conditioner system, and obtains the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube 801 detected in the three-temperature sensor 103 on air-conditioner system.Then control module 202 will, according to temperature Tx or Tx-Ty, judge whether to enter defrost.Namely when temperature Tx is less than or equal to the first temperature threshold T1, or when Tx-Ty is greater than the 6th temperature threshold T6 constantly, conducting bypass defrosting, to carry out bypass defrosting to air-conditioner.After carrying out a bypass defrosting, counting module 203 will count bypass defrosting number of times, and simultaneous temperature acquisition module 201 is also by the minimum temperature Tz of micro-channel parallel flow heat exchanger outdoor during defrost detected by acquisition second temperature sensor.Then control module 202 also judges whether to carry out the tangential defrost of cross valve by according to the number of times of bypass defrosting and temperature Tz.Namely when the number of times of bypass defrosting reaches predetermined times num and at the end of n-th um-1 time bypass defrosting, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger is less than the second temperature threshold T2, control module 202 controls cross valve commutation, carries out the tangential defrost of cross valve to air-conditioner.
The present invention, by increasing bypass circulation in air-conditioner system, carries out bypass defrosting during low-temperature heating, is conducive to improving low-temperature heating capacity, and during defrost simultaneously, power generating ratio number of times, improves microchannel parallel pipeline heat exchanger air-conditioner comfort level.And, when bypass defrosting is unclean, carry out a tangential defrost of cross valve, open by-passing valve simultaneously, refrigerant is made to enter into every root flat tube on micro-channel parallel flow heat exchanger more uniformly, frost on removing heat exchanger that can be rapid and clean, the clean frost of avoiding has influence on next cycle heat exchanger, improves air-conditioner system low-temperature heating capacity to a certain extent.
Further, above-mentioned control module 202 also for: when temperature Ty is more than or equal to the 3rd temperature threshold T3, exit bypass defrosting.
When carrying out bypass defrosting, temperature acquisition module 201 is by the temperature Ty on the outdoor micro-channel parallel flow heat exchanger inlet tube 801 detected by acquisition three-temperature sensor 103, and then control module 202 judges whether to exit bypass defrosting according to this temperature Ty.Namely, when temperature Ty is more than or equal to the 3rd temperature threshold T3, controller Controlling solenoid valve 6 disconnects, and exits bypass defrosting.
Further, with reference to Figure 11, above-mentioned control device also comprises timing module 204, for when conducting bypass circulation, and the running time of record bypass defrosting.Above-mentioned control module 202 also for: when being greater than the second preset time the running time of described bypass defrosting, disconnect bypass circulation, exit bypass defrosting.
When carrying out bypass defrosting, timing module 204 is by the running time of record bypass defrosting.Then control module 202 judged whether to exit bypass defrosting according to the running time of bypass defrosting.Namely, when being greater than the second preset time the running time of described bypass defrosting, control module 202 Controlling solenoid valve 6 disconnects, and exits bypass defrosting; When being less than or equal to the second preset time the running time of described bypass defrosting, then temperature acquisition module 201 continue detected by acquisition three-temperature sensor 103 outdoor micro-channel parallel flow heat exchanger inlet tube 801 on temperature Ty.Then control module judges whether to exit bypass defrosting according to temperature Ty again.In the present embodiment, not only according to the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube 801, but also the overlong time of bypass defrosting can be avoided and affect heating the time normally by arranging of the second preset time.
Further, said temperature acquisition module 201 also for: obtain the current exhaust gas temperature Tp of compressor
n; During bypass circulation conducting after cross valve is tangential, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger when starting to obtain defrost; When disconnecting bypass circulation, obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet 812.
Above-mentioned control module 202 also for: as current exhaust gas temperature Tp
nbe less than the delivery temperature Tp of the last compressor obtained
n-1time, conducting bypass circulation; When temperature Tz is greater than the 4th temperature threshold T4, disconnect bypass circulation; When temperature Tx is greater than the 5th temperature threshold T5, exit the tangential defrost of cross valve.
In air-conditioner system shown in Fig. 1, be provided with the 4th temperature sensor 102 in the exhaust ports of compressor.When air-conditioner system enters the tangential defrost of cross valve, temperature acquisition module 201 will start the delivery temperature Tp of the compressor 1 obtained detected by the 4th temperature sensor 102
n.In the present embodiment, separated in time is carried out the acquisition of the delivery temperature of compressor, this interval time is obtained once every 5 seconds.Then control module 202 is by the comparative result of the delivery temperature of the front and back twice according to obtained compressor, judges whether to want conducting bypass circulation.Namely Tp is worked as
nbe less than Tp
n-1time, then Controlling solenoid valve 6 is opened, thus conducting bypass circulation.After bypass circulation conducting, temperature acquisition module 201 is by the minimum temperature Tz of the outdoor micro-channel parallel flow heat exchanger detected by acquisition second temperature sensor.Then control module 202 judges whether to disconnect bypass circulation according to temperature Tz.Namely, when Tz is more than or equal to the 4th temperature threshold T4, bypass circulation is disconnected.After bypass circulation disconnects, temperature Tx on the outlet 812 of the outdoor micro-channel parallel flow heat exchanger that temperature acquisition module 201 acquisition the first temperature sensor 101 detects.Then control module 202 judges whether to exit the tangential defrost of cross valve according to temperature Tx.Namely, when Tx is more than or equal to the 5th temperature threshold T5, exit the tangential defrost of cross valve, enter normal heating mode.
Be understandable that, said temperature acquisition module 201 can be respectively the first temperature sensor be arranged on air-conditioner system, the second temperature sensor, three-temperature sensor, the 4th temperature sensor.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that above-described embodiment method can add required general hardware platform by software and realize, can certainly pass through the function of the above-mentioned control device of hardware implementing, but in a lot of situation, the former is better embodiment.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium (as ROM/RAM, magnetic disc, CD), comprises some instructions and performs method described in each embodiment of the present invention in order to make air-conditioner.
The foregoing is only the preferred embodiments of the present invention; not thereby its scope of the claims is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; directly or indirectly be used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an air-conditioner system, comprise the compressor, cross valve, indoor heat exchanger, throttle part and the outdoor micro-channel parallel flow heat exchanger that are connected by pipe arrangement successively, it is characterized in that, described air-conditioner system also comprises bypass circulation and controls the control device of bypass circulation conducting or cross valve, one end of this bypass circulation is connected with the outlet of described outdoor microchannel advection heat exchanger, and the other end is connected with the outlet of described indoor heat exchanger; Described control device comprises:
Temperature acquisition module, when running the first preset time under heating mode for air-conditioner, starts to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet, obtains the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube; When bypass circulation disconnects, obtain the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger during defrost;
Counting module, for when bypass circulation disconnects, the number of times of record bypass defrosting;
Control module, for being less than or equal to the first temperature threshold T1 as temperature Tx or when Tx-Ty is greater than the 6th temperature threshold T6, conducting bypass circulation, carries out bypass defrosting to air-conditioner, and disconnects bypass circulation when meeting bypass defrosting exit criteria; The number of times of bypass defrosting reach predetermined times and on minimum temperature Tz once at the end of bypass defrosting be less than the second temperature threshold T2 time, control cross valve commutation, the tangential defrost of cross valve carried out to air-conditioner.
2. air-conditioner system according to claim 1, is characterized in that, described control module also for: when temperature Ty is more than or equal to the 3rd temperature threshold T3, exit bypass defrosting.
3. air-conditioner system according to claim 1, is characterized in that, described control device also comprises timing module, for when conducting bypass circulation, and the running time of record bypass defrosting;
Control module also for: when being greater than the second preset time the running time of described bypass defrosting, disconnect bypass circulation, exit bypass defrosting.
4. air-conditioner system according to claim 1, is characterized in that, described temperature acquisition module also for: obtain the current exhaust gas temperature Tp of compressor
n; During bypass circulation conducting after cross valve is tangential, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger when starting to obtain defrost; When disconnecting bypass circulation, obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet;
Described control module also for: as current exhaust gas temperature Tp
nbe less than the delivery temperature Tp of the last compressor obtained
n-1time, conducting bypass circulation; When temperature Tz is more than or equal to the 4th temperature threshold T4, disconnect bypass circulation; When temperature Tx is more than or equal to the 5th temperature threshold T5, exit the tangential defrost of cross valve.
5. a defrosting control method for air-conditioner system, is characterized in that, described air-conditioner system is air-conditioner system according to claim 1, and described control method comprises the following steps:
Under air-conditioner operation heating mode during the first preset time, start to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet, the temperature Ty on inlet tube;
When temperature Tx is less than the first temperature threshold T1 or is greater than the 6th temperature threshold T6 as Tx-Ty, conducting bypass circulation, carries out bypass defrosting to air-conditioner, and disconnects bypass circulation when meeting bypass defrosting exit criteria;
When bypass circulation disconnects, the number of times of record bypass defrosting, and the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger when obtaining defrost;
Reach predetermined times at the number of times of bypass defrosting, and when the minimum temperature Tz at the end of last bypass defrosting is less than the second temperature threshold T2, controls cross valve commutation, the tangential defrost of cross valve is carried out to air-conditioner.
6. the defrosting control method of air-conditioner system according to claim 5, is characterized in that, the described bypass circulation that disconnects when meeting bypass defrosting exit criteria comprises:
When temperature Ty is more than or equal to the 3rd temperature threshold T3, exit bypass defrosting;
When temperature Ty is less than the 3rd temperature threshold T3, continue to obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube.
7. the defrosting control method of air-conditioner system according to claim 6, is characterized in that, the temperature Ty on the outdoor micro-channel parallel flow heat exchanger inlet tube of described acquisition comprises: the temperature Ty on the outdoor micro-channel parallel flow heat exchanger inlet tube of interval acquiring;
Described when temperature Ty is more than or equal to the 3rd temperature threshold T3, exit bypass defrosting and comprise: temperature Ty is continuous when being all more than or equal to the 3rd temperature threshold T3 b time, disconnect bypass circulation, exit bypass defrosting.
8. the defrosting control method of air-conditioner system according to claim 6, is characterized in that, also comprises before the temperature Ty on the outdoor micro-channel parallel flow heat exchanger inlet tube of described acquisition:
The running time of record bypass defrosting;
When being less than or equal to the second preset time the running time of described bypass defrosting, obtain the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube;
When being greater than the second preset time the running time of described bypass defrosting, disconnecting bypass circulation, exiting bypass defrosting.
9. the defrosting control method of air-conditioner system according to claim 5, it is characterized in that, under described air-conditioner operation heating mode during the first preset time, start to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet, temperature Ty on inlet tube comprises: under air-conditioner operation heating mode during the first preset time, temperature Tx on the outlet of outdoor micro-channel parallel flow heat exchanger described in interval acquiring, interval acquiring obtains the temperature Ty on outdoor micro-channel parallel flow heat exchanger inlet tube;
Described when temperature Tx is less than the first temperature threshold T1, conducting bypass circulation comprises: when temperature Tx is continuous be all less than for a time the first temperature threshold T1 or when Tx-Ty is continuous be greater than the 6th temperature threshold T6 for a time time, conducting bypass circulation, wherein a is natural number;
During described acquisition defrost, the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger comprises: the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger described in interval acquiring;
The described number of times at bypass defrosting reaches predetermined times, and the minimum temperature Tz at the end of last bypass defrosting is when being less than the second temperature threshold T2, control cross valve commutates, carry out the tangential defrost of cross valve to air-conditioner to comprise: when the number of times of bypass defrosting reaches predetermined times, and minimum temperature Tz at the end of last bypass defrosting is continuous when being all less than the second temperature threshold T2 m time, control cross valve commutates, and carry out the tangential defrost of cross valve to air-conditioner, wherein m is natural number.
10. the defrosting control method of the air-conditioner system according to any one of claim 5-9, is characterized in that, described control cross valve commutation, also comprises while carrying out the tangential defrost of cross valve to air-conditioner:
Obtain the current exhaust gas temperature Tp of compressor
n;
As current exhaust gas temperature Tp
nbe less than the delivery temperature Tp of the last compressor obtained
n-1time, conducting bypass circulation;
Obtain the minimum temperature Tz of outdoor micro-channel parallel flow heat exchanger during defrost;
When temperature Tz is more than or equal to the 4th temperature threshold T4, disconnect bypass circulation;
When temperature Tz is less than the 4th temperature threshold T4, continue the minimum temperature Tz obtaining outdoor micro-channel parallel flow heat exchanger;
When disconnecting bypass circulation, obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet;
When temperature Tx is more than or equal to the 5th temperature threshold T5, exit the tangential defrost of cross valve, and the number of times of bypass defrosting resets;
When temperature Tx is less than the 5th temperature threshold T5, continue to obtain the temperature Tx on outdoor micro-channel parallel flow heat exchanger outlet.
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| CN201310446426.5A CN103486783B (en) | 2013-09-26 | 2013-09-26 | Air-conditioner system and defrosting control method thereof |
| PCT/CN2013/090591 WO2015043097A1 (en) | 2013-09-26 | 2013-12-26 | Air conditioner system and defrosting control method therefor |
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| CN104791969B (en) * | 2015-04-30 | 2017-10-13 | 广东美的制冷设备有限公司 | Temperature compensation means and air conditioner |
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| WO2015043097A1 (en) | 2015-04-02 |
| CN103486783A (en) | 2014-01-01 |
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