CN104764111A - Multi-connected air conditioning system and defrosting control method thereof - Google Patents
Multi-connected air conditioning system and defrosting control method thereof Download PDFInfo
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- CN104764111A CN104764111A CN201410004315.3A CN201410004315A CN104764111A CN 104764111 A CN104764111 A CN 104764111A CN 201410004315 A CN201410004315 A CN 201410004315A CN 104764111 A CN104764111 A CN 104764111A
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- outdoor unit
- unit modules
- valve
- air conditioning
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 62
- 238000010257 thawing Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims description 22
- 238000005057 refrigeration Methods 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 11
- 239000003507 refrigerant Substances 0.000 description 44
- 230000005494 condensation Effects 0.000 description 12
- 238000009833 condensation Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 9
- 230000005855 radiation Effects 0.000 description 8
- 238000007599 discharging Methods 0.000 description 5
- 230000008676 import Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000018199 S phase Effects 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003134 recirculating effect Effects 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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
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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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
-
- 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
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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
- F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
- F25B2313/0252—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units with bypasses
- F25B2313/02522—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units with bypasses during defrosting
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- 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)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a multi-connected air conditioning system and a defrosting control method thereof. The multi-connected air conditioning system comprises an indoor unit module and a plurality of outdoor unit modules connected in parallel, wherein each outdoor unit module comprises a compressor, a four-way valve, an outdoor heat exchanger, a first throttling element, a first control valve, a second control valve, a third control valve, a fourth control valve, and a fifth control valve; each first control valve is connected between the corresponding first throttling element and the indoor unit module; each second control valve is connected with the corresponding first throttling element; and each second control valve is connected to a first public pipeline; each third control valve is connected with a corresponding fourth control valve port; each third control valve is connected to a second public pipe; and the second public pipe is connected with the indoor unit module; each fourth control valve is connected with a second valve port and the first public pipe; each fifth control valve is connected with a first valve port and the second public pipe. According to the invention, continuous heating during defrosting is realized, and the indoor unit module does not stop, so that comfortability is improved.
Description
Technical field
The present invention relates to electrical equipment manufacturing technology field, especially relate to a kind of multi-connected air conditioning system and defrosting control method thereof.
Background technology
At present no matter that parallel module multi-connected air conditioning system or free-standing multi-connected air conditioning system are during defrosting, all whole system must be converted to refrigeration mode to realize the frost outdoor heat exchanger except clean from heating mode, and in defrost process, indoor set must prevent defrost process from indoor heat is taken away by close chamber's inner blower, indoor heat exchanger there will be frosting situation, abnormal sound is produced sometimes because expanding with heat and contract with cold rapidly, and after exiting defrosting, system needs when just having transferred normal heating mode to carry out anti-cold wind control, when in waiting room, heat exchanger coils temperature rises and meets the demands, indoor fan could be opened.In whole refrigeration defrost process, indoor set there will be shutdown phenomenon, and lasting a few minutes were to the time of tens minutes, and comfort is lower, and easily causes user to misread.
Summary of the invention
The present invention is intended at least to solve one of technical problem existed in prior art.
For this reason, one object of the present invention is to propose a kind of multi-connected air conditioning system, achieves continuous heating during defrosting, and indoor set module is not shut down.
Another object of the present invention is the defrosting control method proposing a kind of above-mentioned multi-connected air conditioning system.
According to the multi-connected air conditioning system of the embodiment of the present invention, comprising: indoor set module, described indoor set module comprises at least one indoor heat exchanger; The outdoor unit modules of multiple parallel connection, each described outdoor unit modules comprises: compressor, and described compressor has exhaust outlet and air entry; Cross valve, described cross valve comprises first to fourth valve port, and described first valve port is connected with described exhaust outlet, and described second valve port is connected with described air entry; Outdoor heat exchanger, one end of described outdoor heat exchanger is connected with described 3rd valve port; First throttle element, described first throttle element is connected with the other end of described outdoor heat exchanger; First control valve, described first control valve is connected between described first throttle element and described indoor set module; Second control valve, one end of described second control valve is connected to the pipeline between described first throttle element and described first control valve, and the other end of described second control valve is connected to the first common line; 3rd control valve, one end of described 3rd control valve is connected with described 4th valve port, and the other end of described 3rd control valve is connected to the second common line, and described second common line is connected with described indoor set module; 4th control valve, described one end of 4th control valve is connected with the second valve port of described cross valve, and the first common line described in the other end of described 4th control valve is connected; 5th control valve, described one end of 5th control valve is connected with the first valve port of described cross valve, and the other end of described 5th control valve is connected with described second common line; Wherein, when needing the outdoor unit modules defrosting one of them in described multiple outdoor unit modules being in heating mode, described second control valve in one of them outdoor unit modules described and described 5th control valve are opened, and described first control valve in remaining outdoor unit modules in described multiple outdoor unit modules, described 3rd control valve and described 4th control valve are opened.
According to the multi-connected air conditioning system of the embodiment of the present invention; when one of them outdoor unit modules defrosts; remaining outdoor unit modules is still in heating mode; achieve multi-connected air conditioning system continuous heating during defrosting; indoor set module is not shut down, thus improves the comfortableness of multi-connected air conditioning system.
In addition, according to multi-connected air conditioning system of the present invention, also there is following additional technical feature:
According to some embodiments of the present invention, each outdoor unit modules also comprises the first check valve, and described first check valve is connected between described first valve port and described exhaust outlet with from described exhaust outlet to one-way conduction on the direction of described first valve port.Thus the reliability of multi-connected air conditioning system can be improved.
In some embodiments of the invention, each outdoor unit modules also comprises oil eliminator, and described oil eliminator is connected between described exhaust outlet and described first valve port, and the oil export of described oil eliminator is connected with described air entry.Thus the reliability of compressor can be improved.
Further, each outdoor unit modules also comprises second section fluid element, and described second section fluid element is connected between described oil export and described air entry.
In further embodiment of the present invention, each outdoor unit modules also comprises gas-liquid separator, described gas-liquid separator has entrance and gas vent, and described gas vent is connected with described air entry, and described entrance is connected with described 4th control valve with described second valve port respectively.
Further, each outdoor unit modules also comprises the first stop valve, and described first stop valve is connected between described first control valve and described indoor set module.
Further, each outdoor unit modules also comprises the second stop valve, and described second stop valve is connected between described second control valve and described first common line.
Further, each outdoor unit modules also comprises the 3rd stop valve, and described 3rd stop valve is connected between described 3rd control valve and described second common line, and one end of described 5th control valve is connected between described 3rd control valve and described 3rd stop valve.
Further, each outdoor unit modules also comprises the 4th stop valve, and described 4th stop valve is connected between described 4th control valve and described first common line.
Particularly, described first control valve, described second control valve, described 3rd control valve, described 4th control valve and described 5th control valve are respectively magnetic valve.
According to the defrosting control method of the multi-connected air conditioning system of the embodiment of the present invention, described multi-connected air conditioning system is multi-connected air conditioning system according to the above embodiment of the present invention, described defrosting control method comprises the steps: S1: when the outdoor unit modules being in heating mode in described multiple outdoor unit modules sends defrosting instruction, judge that whether all the other outdoor unit modules in described multiple outdoor unit modules are in running order; S2: when all the other outdoor unit modules described are in heating mode, keep heating mode constant, the cross valve of a described outdoor unit modules is switched to refrigeration mode, and described first control valve in a described outdoor unit modules is closed, described 3rd control valve is closed, described 4th control valve is closed, described second control valve is opened, described 5th control valve is opened and described compressor shutdown; When all the other outdoor unit modules described are in off-duty state; all the other outdoor unit modules described enter heating mode; and described first control valve of each outdoor unit modules in all the other outdoor unit modules described, described 3rd control valve and described 4th control valve are opened; the cross valve of a described outdoor unit modules is switched to refrigeration mode, and described first control valve in a described outdoor unit modules is closed, described 3rd control valve is closed, described 4th control valve is closed, described second control valve is opened, described 5th control valve is opened and described compressor shutdown.
According to the defrosting control method of the multi-connected air conditioning system of the embodiment of the present invention; when one of them outdoor unit modules defrosts; remaining outdoor unit modules is still in heating mode; achieve multi-connected air conditioning system continuous heating during defrosting; indoor set module is not shut down, thus improves the comfortableness of multi-connected air conditioning system.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the schematic diagram of the multi-connected air conditioning system according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the outdoor unit modules in the multi-connected air conditioning system shown in Fig. 1;
Fig. 3 is the flow chart of the defrosting control method of multi-connected air conditioning system according to the embodiment of the present invention.
Reference numeral:
Multi-connected air conditioning system 100, indoor set module 1, indoor heat exchanger 10, outdoor unit modules 2, first outdoor unit modules 2a, second outdoor unit modules 2b, 3rd outdoor unit modules 2c, compressor 20, exhaust outlet a, air entry b, cross valve 21, first valve port D, second valve port S, 3rd valve port C, 4th valve port E, outdoor heat exchanger 22, first throttle element 23, first control valve 24, second control valve 25, 3rd control valve 26, 4th control valve 27, 5th control valve 28, first check valve 29, oil eliminator 30, import f, oil export h, gas outlet i, second section fluid element 31, gas-liquid separator 32, entrance g, gas vent w, first stop valve 33, second stop valve 34, 3rd stop valve 35, 4th stop valve 36, first interface 37, second interface 38, 3rd interface 39, 4th interface 40, second check valve 41, first common line 3, second common line 4
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, it will be appreciated that, term " on ", D score, "front", "rear", "left", "right", " top ", " end ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise one or more these features.In describing the invention, except as otherwise noted, the implication of " multiple " is two or more.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
Describe the multi-connected air conditioning system 100 according to the embodiment of the present invention below with reference to Fig. 1 and Fig. 2, this multi-connected air conditioning system 100 has heating mode and refrigeration mode.It should be noted that; in following multi-connected air conditioning system 100; only describe the situation that this multi-connected air conditioning system 100 comprises three outdoor unit modules 2; but it should be noted that; the present invention is not limited thereto; what the technical staff of common art obviously knew is; reading the present invention's instruction disclosed herein; this embodiment can be applied to the situation that multi-connected air conditioning system 100 comprises the outdoor unit modules 2 of more than two and three; this also drops within protection scope of the present invention, is described in detail below to multi-connected air conditioning system 100.
As depicted in figs. 1 and 2, multi-connected air conditioning system 100 according to the embodiment of the present invention comprises: indoor set module 1 and three outdoor unit modules 2 in parallel, and wherein, indoor set module 1 comprises at least one indoor heat exchanger 10, it should be noted that, indoor set module 1 also comprises the elements such as indoor fan.Three outdoor unit modules 2 are respectively the first outdoor unit modules 2a, the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c, and the first outdoor unit modules 2a, the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c are connected in parallel to indoor set module 1.
Particularly, each outdoor unit modules 2 comprises: compressor 20, cross valve 21, outdoor heat exchanger 22, first throttle element 23, first control valve 24, second control valve 25, the 3rd control valve 26, the 4th control valve 27 and the 5th control valve 28, wherein, compressor 20 has exhaust outlet a and air entry b, it should be noted that, the structure of compressor 20 and operation principle etc. are the state of the art, are just not described in detail here.Cross valve 21 comprises the first valve port D, the second valve port S, the 3rd valve port C and the 4th valve port E, first valve port D is connected with exhaust outlet a, air entry b and the second valve port S-phase connect, when outdoor unit modules 2 be in heat state time, cross valve 21 is in heating mode, now the first valve port D and the 4th valve port E conducting and the second valve port S and the 3rd valve port C conducting, when outdoor unit modules 2 is in refrigerating state, cross valve 21 is in refrigeration mode, now the first valve port D and the 3rd valve port C conducting and the second valve port S and the 4th valve port E conducting.
One end of outdoor heat exchanger 22 is connected with the 3rd valve port C.First throttle element 23 is connected with the other end of outdoor heat exchanger 22, and alternatively, first throttle element 23 is capillary.First control valve 24 is connected between first throttle element 23 and indoor set module 1.One end of second control valve 25 is connected to and pipeline between first throttle element 23 and the first control valve 24, the other end of the second control valve 25 is connected to the first common line 3, that is, the second control valve 25 of multiple outdoor unit modules 2 is connected to the first common line 3 respectively.
One end of 3rd control valve 26 is connected with the 4th valve port E, the other end of each 3rd control valve 26 is connected to the second common line 4, second common line 4 is connected with indoor set module 1, that is, the 3rd control valve 26 of each outdoor unit modules 2 is all connected with indoor set module 1 by the second common line 4.
One end of 4th control valve 27 is connected with the second valve port S of cross valve 21, and the other end of the 4th control valve 27 is connected with the first common line 3.One end of 5th control valve 28 is connected with the first valve port D, and the other end of the 5th control valve 28 is connected with the second common line 4.Wherein, the first control valve 24, second control valve 25, the 3rd control valve 26, the 4th control valve 27 and the 5th control valve 28 have opening and closed condition respectively.Alternatively, the first control valve 24, second control valve 25, the 3rd control valve 26, the 4th control valve 27 and the 5th control valve 28 are respectively magnetic valve.
When needing the outdoor unit modules 2 being in heating mode to one of them in three outdoor unit modules 2 to defrost, the outdoor unit modules 2 that one of them outdoor unit modules 2(is namely to be defrosted) in the second control valve 25 and the 5th control valve 28 open, the first control valve 24 of one of them outdoor unit modules 2, the 3rd control valve 26 and the 4th control valve 27 are closed.The first control valve 24 in remaining outdoor unit modules 2 in multiple outdoor unit modules 2, the 3rd control valve 26 and the 4th control valve 27 are opened, and the second control valve 25 in remaining outdoor unit modules 2 in multiple outdoor unit modules 2 and the 5th control valve 28 are closed.
If all outdoor unit modules 2 of multi-connected air conditioning system 100 are opened heating mode and are in when normally heating under state, i.e. the first outdoor unit modules 2a, second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is all in and normally heats state, now the first outdoor unit modules 2a, the first control valve 24 in second outdoor unit modules 2b and the 3rd outdoor unit modules 2c, 3rd control valve 26 and the 4th control valve 27 are in opening, second control valve 25 and the 5th control valve 28 are in closed condition, and the first valve port D of each cross valve 21 and the 4th valve port E conducting and the second valve port S and the 3rd valve port C conducting.
When the first outdoor unit modules 2a requires to enter into refrigeration mode, the compressor 20 of the first outdoor unit modules 2a reduces output, close first control valve 24 of the first outdoor unit modules 2a, 3rd control valve 26 and the 4th control valve 27, cross valve 21 power down of the first outdoor unit modules 2a switches to refrigeration mode, now the cross valve 21 of the first outdoor unit modules 2a is the first valve port D and the 3rd valve port C conducting and the second valve port S and the 4th valve port E conducting, then, the compressor 20 of the first outdoor unit modules 2a is shut down, then the second control valve 25 and the 5th control valve 28 of the first outdoor unit modules 2a is opened.Second outdoor unit modules 2b and the 3rd outdoor unit modules 2c keeps heating mode constant.
Can improve frequency and increase output after the first outdoor unit modules 2a shuts down, indoor set module 1 keeps original pattern normally to run.Now as illustrated by the arrows in fig. 1, the high pressure gaseous refrigerant of discharging from the exhaust outlet a of the compressor 20 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is drained in the second common line 4 by cross valve 21 and the 3rd control valve 26 successively, a part for refrigerant in second common line 4 enters in indoor set module 1, the indoor heat exchanger 10 that this part of refrigerant enters into indoor set module 1 carries out condensation heat radiation, refrigerant after condensation heat radiation indoor machine module 1 is discharged and is drained in corresponding outdoor heat exchanger 22 by first control valve 24 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c and first throttle element 23, the refrigerant that heat exchanger 22 is discharged outdoor is expelled back in compressor 20 by cross valve 21 and air entry b.
Another part of high pressure gaseous refrigerant in second common line 4 is drained in the outdoor heat exchanger 22 of the first outdoor unit modules 2a by the 5th control valve 28 of the first outdoor unit modules 2a and the cross valve 21 of the first outdoor unit modules 2a, the condensation in the outdoor heat exchanger 22 of the first outdoor unit modules 2a of high pressure gaseous refrigerant is dispelled the heat to defrost to outdoor heat exchanger 22, the liquid refrigerants of low-temp low-pressure is become after defrosting, this liquid refrigerants is discharged in the first common line 3 by the second control valve 25 again through the first outdoor unit modules 2a after first throttle element 23 throttling, liquid refrigerants in first common line 3 is expelled back in corresponding compressor 20 respectively by the 4th control valve 27 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c.Thus the defrost process completed the first outdoor unit modules 2a.After defrosting terminates, cross valve 21 on first outdoor unit modules 2a is switched to heating mode, close the second control valve 25 and the 5th control valve 28 of the first outdoor unit modules 2a, open first control valve 24 of the first outdoor unit modules 2a, the 3rd control valve 26 and the 4th control valve 27, first outdoor unit modules 2a simultaneously and reopen heating mode.
It should be noted that, when the second outdoor unit modules 2b or the 3rd outdoor unit modules 2c require to enter defrosting, defrosting principle when defrosting principle and the first outdoor unit modules 2a of multi-connected air conditioning system 100 enter defrosting is identical, is just not described in detail here.
When the first outdoor unit modules 2a, the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c send defrosting request simultaneously, undertaken by outdoor unit modules 2 sequence of addresses, carry out the defrosting of single outdoor unit modules 2 in turn.When single outdoor unit modules 2 receives the defrosting request of other outdoor unit modules 2 in defrost process, must wait for that the outdoor unit modules 2 defrosted is undertaken by outdoor unit modules 2 sequence of addresses after having removed frost again, carry out single outdoor unit modules 2 in turn and defrost.
If multi-connected air conditioning system 100 only has an outdoor unit modules 2 to open heating mode, such as when the first outdoor unit modules 2a opens heating mode, second outdoor unit modules 2b and the 3rd outdoor unit modules 2c does not open heating mode, now first control valve 24, second control valve 25 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c, the 3rd control valve 26 and the 5th control valve 28 are in closed condition, and the 4th control valve 27 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is in open mode.When the first outdoor unit modules 2a requires to defrost, the compressor 20 of the first outdoor unit modules 2a reduces output, total output when original first outdoor unit modules 2a being in heating mode is on average on the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c, and the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c opens heating mode respectively, after the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is stable, first outdoor unit modules 2a closes the first control valve 24, 3rd control valve 26 and the 4th control valve 27, cross valve 21 power down of the first outdoor unit modules 2a switches to refrigeration mode, the compressor 20 of the first outdoor unit modules 2a is shut down, then the second control valve 25 and the 5th control valve 28 of the first outdoor unit modules 2a is opened, indoor set module 1 keeps original pattern normally to run.
Now as illustrated by the arrows in fig. 1, the high pressure gaseous refrigerant of discharging from the exhaust outlet a of the compressor 20 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is drained in the second common line 4 by cross valve 21 and the 3rd control valve 26 successively, a part for refrigerant in second common line 4 enters in indoor set module 1, the indoor heat exchanger 10 that this part of refrigerant enters into indoor set module 1 carries out condensation heat radiation, refrigerant after condensation heat radiation indoor machine module 1 is discharged and is drained in corresponding outdoor heat exchanger 22 by first control valve 24 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c and first throttle element 23, the refrigerant that heat exchanger 22 is discharged outdoor is expelled back in compressor 20 by cross valve 21 and air entry b.
Another part of high pressure gaseous refrigerant in second common line 4 is drained in the outdoor heat exchanger 22 of the first outdoor unit modules 2a by the 5th control valve 28 of the first outdoor unit modules 2a and the cross valve 21 of the first outdoor unit modules 2a, the condensation in the outdoor heat exchanger 22 of the first outdoor unit modules 2a of high pressure gaseous refrigerant is dispelled the heat to defrost to outdoor heat exchanger 22, the liquid refrigerants of low-temp low-pressure is become after defrosting, this liquid refrigerants is discharged in the first common line 3 by the second control valve 25 again through the first outdoor unit modules 2a after first throttle element 23 throttling, liquid refrigerants in first common line 3 is expelled back in compressor 20 respectively by the 4th control valve 27 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c.Thus the defrost process completed the first outdoor unit modules 2a.After defrosting terminates, the first outdoor unit modules 2a reopens heating mode, and the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c shuts down.
According to the multi-connected air conditioning system 100 of the embodiment of the present invention; when one of them outdoor unit modules 2 defrosts; remaining outdoor unit modules 2 is still in heating mode; achieve multi-connected air conditioning system 100 continuous heating during defrosting; indoor set module 1 is not shut down, thus improves the comfortableness of multi-connected air conditioning system 100.
In some embodiments of the invention, as depicted in figs. 1 and 2, each outdoor unit modules 2 also comprises the first check valve 29, first check valve 29 and is connected between the first valve port D and exhaust outlet a with from exhaust outlet a to one-way conduction on the direction of the first valve port D.Thus can prevent the refrigerant being discharged to the first valve port D by the 5th control valve 28 from entering in exhaust outlet a, ensure that the reliability of multi-connected air conditioning system 100.
As shown in 1 and Fig. 2, in further embodiment of the present invention, each outdoor unit modules 2 also comprises oil eliminator 30, oil eliminator 30 is connected between exhaust outlet a and the first valve port D, the oil export h of oil eliminator 30 is connected with air entry b, further, each outdoor unit modules 2 also comprises second section fluid element 31, and second section fluid element 31 is connected between oil export h and air entry b.Particularly, oil eliminator 30 has import f, oil export h gentle outlet i, import f is connected with exhaust outlet a, gas outlet i is connected with the first valve port D, oil export h is connected with second section fluid element 31, second section fluid element 31 is connected with air entry b, enter in oil eliminator 30 from the refrigerant of the oil gas state of exhaust outlet a discharge and carry out Oil-gas Separation, gaseous coolant after separation enters in the first valve port D by gas outlet i, refrigeration oil after separation is by being expelled back in compressor 20 after second section fluid element 31 throttling, thus ensure the recirculating oil quantity of compressor 20, extend the service life of compressor 20.Alternatively, second section fluid element 31 is capillary.
In the example of fig. 1 and 2, first check valve 29 is connected between the gas outlet i and the first valve port D of oil eliminator 30, and as shown in Figure 1, each outdoor unit modules 2 also comprises the second check valve 41, second check valve 41 is connected between the import f of exhaust outlet a and oil eliminator 30, thus can ensure the reliability of multi-connected air conditioning system 100 further.
As depicted in figs. 1 and 2, according to some embodiments of the present invention, each outdoor unit modules 2 also comprises gas-liquid separator 32, and gas-liquid separator 32 has entrance g and gas vent w, gas vent w is connected with air entry b, and entrance g is connected with the 4th control valve 27 with the second valve port S respectively.The refrigerant of now discharging from the second valve port S and the 4th control valve 27 enters in gas-liquid separator 32 and carries out gas-liquid separation, isolated gaseous coolant is expelled back in compressor 20 by gas vent w and air entry b, thus ensures that only having gaseous coolant to get back in compressor 20 carries out compression cycle.
According to some embodiments of the present invention, as depicted in figs. 1 and 2, each outdoor unit modules 2 also comprises the first stop valve 33, second stop valve 34, the 3rd stop valve 35 and the 4th stop valve 36, first stop valve 33 and is connected between the first control valve 24 and indoor set module 1.Second stop valve 34 is connected between the second control valve 25 and the first common line 3.3rd stop valve 35 is connected between the 3rd control valve 26 and the second common line 4, and one end of the 5th control valve 18 is connected between the 3rd control valve 26 and the 3rd stop valve 35.4th stop valve 36 is connected between the 4th control valve 27 and the first common line 3.Wherein, the refrigerant that the first stop valve 33, second stop valve 34, the 3rd stop valve 35 and the 4th stop valve 36 circulate for truncated system, is convenient to the maintenance of each outdoor unit modules 2.
Particularly, as shown in Figure 2, each outdoor unit modules 2 has four interfaces respectively, first throttle element 23 is connected with two branch roads, the branch road be made up of the first control valve 24 and the first stop valve 33 is first interface 37, another branch road be made up of the second control valve 25 and the second stop valve 34 is the second interface 38, the pipeline at the 3rd control valve 26 and the 3rd stop valve 35 place is the 3rd interface 39, the pipeline at the 4th control valve 27 and the 4th stop valve 36 place is the 4th interface 40, the first interface 37 of each outdoor unit modules 2 is connected to indoor set module 1, namely the first interface 37 of multiple outdoor unit modules 2 is connected in parallel and is formed as liquid lateral line, second interface 38 of each outdoor unit modules 2 is connected with the first common line 3 respectively with the 4th interface 40, that is, second interface 38 and the 4th interface 40 of each outdoor unit modules 2 are connected in parallel by the first common line 3 and are interconnected.3rd interface 39 of each outdoor unit modules 2 is connected with the second common line 4, and namely the 3rd interface 39 of each outdoor unit modules 2 is connected in parallel, and now the second common line 4 is gas lateral line.
Describe the defrosting control method according to the multi-connected air conditioning system of the embodiment of the present invention below with reference to Fig. 1-Fig. 3, wherein multi-connected air conditioning system is multi-connected air conditioning system 100 according to the above embodiment of the present invention.
As shown in Figure 3, comprise the steps: according to the defrosting control method of the embodiment of the present invention
S1: when the outdoor unit modules being in heating mode in multiple outdoor unit modules sends defrosting instruction, judge that whether all the other outdoor unit modules in multiple outdoor unit modules are in running order.
S2: when all the other outdoor unit modules are in heating mode; keep heating mode constant; the cross valve of a described outdoor unit modules is switched to refrigeration mode, and the first control valve in a described outdoor unit modules is closed, the 3rd control valve is closed, the 4th control valve is closed, the second control valve is opened, the 5th control valve is opened and compressor shutdown.
When all the other outdoor unit modules are in off-duty state; all the other outdoor unit modules enter heating mode; and the first control valve of each outdoor unit modules in all the other outdoor unit modules, the 3rd control valve and the 4th control valve are opened; the cross valve of a described outdoor unit modules is switched to refrigeration mode, and the first control valve in a described outdoor unit modules is closed, the 3rd control valve is closed, the 4th control valve is closed, the second control valve is opened, the 5th control valve is opened and compressor shutdown.
Specifically, if when all the other outdoor unit modules 2 are in heating mode, namely now all outdoor unit modules 2 of multi-connected air conditioning system 100 open heating mode and under being in and normally heating state, that is, first outdoor unit modules 2a, second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is all in and normally heats state, now the first outdoor unit modules 2a, the first control valve 24 in second outdoor unit modules 2b and the 3rd outdoor unit modules 2c, 3rd control valve 26 and the 4th control valve 27 are in opening, second control valve 25 and the 5th control valve 28 are in closed condition, and the first valve port D of each cross valve 21 and the 4th valve port E conducting and the second valve port S and the 3rd valve port C conducting.
When the first outdoor unit modules 2a sends defrosting instruction, the compressor 20 of the first outdoor unit modules 2a reduces output, close first control valve 24 of the first outdoor unit modules 2a, 3rd control valve 26 and the 4th control valve 27, cross valve 21 power down of the first outdoor unit modules 2a switches to refrigeration mode, now the cross valve 21 of the first outdoor unit modules 2a is the first valve port D and the 3rd valve port C conducting and the second valve port S and the 4th valve port E conducting, then, the compressor 20 of the first outdoor unit modules 2a is shut down, then the second control valve 25 and the 5th control valve 28 of the first outdoor unit modules 2a is opened.Second outdoor unit modules 2b and the 3rd outdoor unit modules 2c keeps heating mode constant.
Can improve frequency and increase output after the first outdoor unit modules 2a shuts down, indoor set module 1 keeps original pattern normally to run.Now as illustrated by the arrows in fig. 1, the high pressure gaseous refrigerant of discharging from the exhaust outlet a of the compressor 20 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is drained in the second common line 4 by cross valve 21 and the 3rd control valve 26 successively, a part for refrigerant in second common line 4 enters in indoor set module 1, the indoor heat exchanger 10 that this part of refrigerant enters into indoor set module 1 carries out condensation heat radiation, refrigerant after condensation heat radiation indoor machine module 1 is discharged and is drained in corresponding outdoor heat exchanger 22 by first control valve 24 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c and first throttle element 23, the refrigerant that heat exchanger 22 is discharged outdoor is expelled back in compressor 20 by cross valve 21 and air entry b.
Another part of high pressure gaseous refrigerant in second common line 4 is drained in the outdoor heat exchanger 22 of the first outdoor unit modules 2a by the 5th control valve 28 of the first outdoor unit modules 2a and the cross valve 21 of the first outdoor unit modules 2a, the condensation in the outdoor heat exchanger 22 of the first outdoor unit modules 2a of high pressure gaseous refrigerant is dispelled the heat to defrost to outdoor heat exchanger 22, the liquid refrigerants of low-temp low-pressure is become after defrosting, this liquid refrigerants is discharged in the first common line 3 by the second control valve 25 again through the first outdoor unit modules 2a after first throttle element 23 throttling, liquid refrigerants in first common line 3 is expelled back in corresponding compressor 20 respectively by the 4th control valve 27 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c.Thus the defrost process completed the first outdoor unit modules 2a.After defrosting terminates, cross valve 21 on first outdoor unit modules 2a is switched to heating mode, close the second control valve 25 and the 5th control valve 28 of the first outdoor unit modules 2a, open first control valve 24 of the first outdoor unit modules 2a, the 3rd control valve 26 and the 4th control valve 27, first outdoor unit modules 2a simultaneously and reopen heating mode.
It should be noted that, when the second outdoor unit modules 2b or the 3rd outdoor unit modules 2c sends defrosting instruction, the defrosting principle of multi-connected air conditioning system 100 is identical with the defrosting principle that the first outdoor unit modules 2a sends when defrosting instruction, is just not described in detail here.
When the first outdoor unit modules 2a, the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c send defrosting request simultaneously, undertaken by outdoor unit modules 2 sequence of addresses, carry out the defrosting of single outdoor unit modules 2 in turn.When single outdoor unit modules 2 receives the defrosting request of other outdoor unit modules 2 in defrost process, must wait for that the outdoor unit modules 2 defrosted is undertaken by outdoor unit modules 2 sequence of addresses after having removed frost again, carry out single outdoor unit modules 2 in turn and defrost.
If when all the other outdoor unit modules 2 are in off-duty state, namely now multi-connected air conditioning system 100 only has an outdoor unit modules 2 to open heating mode, such as when the first outdoor unit modules 2a opens heating mode, second outdoor unit modules 2b and the 3rd outdoor unit modules 2c does not open heating mode, now first control valve 24 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c, second control valve 25, 3rd control valve 26 and the 5th control valve 28 are in closed condition, 4th control valve 27 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is in open mode.When the first outdoor unit modules 2a requires to defrost, the compressor 20 of the first outdoor unit modules 2a reduces output, total output when original first outdoor unit modules 2a being in heating mode is on average on the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c, and the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c opens heating mode respectively, after the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is stable, first outdoor unit modules 2a closes the first control valve 24, 3rd control valve 26 and the 4th control valve 27, cross valve 21 power down of the first outdoor unit modules 2a switches to refrigeration mode, the compressor 20 of the first outdoor unit modules 2a is shut down, then the second control valve 25 and the 5th control valve 28 of the first outdoor unit modules 2a is opened, indoor set module 1 keeps original pattern normally to run.
Now as illustrated by the arrows in fig. 1, the high pressure gaseous refrigerant of discharging from the exhaust outlet a of the compressor 20 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c is drained in the second common line 4 by cross valve 21 and the 3rd control valve 26 successively, a part for refrigerant in second common line 4 enters in indoor set module 1, the indoor heat exchanger 10 that this part of refrigerant enters into indoor set module 1 carries out condensation heat radiation, refrigerant after condensation heat radiation indoor machine module 1 is discharged and is drained in corresponding outdoor heat exchanger 22 by first control valve 24 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c and first throttle element 23, the refrigerant that heat exchanger 22 is discharged outdoor is expelled back in compressor 20 by cross valve 21 and air entry b.
Another part of high pressure gaseous refrigerant in second common line 4 is drained in the outdoor heat exchanger 22 of the first outdoor unit modules 2a by the 5th control valve 28 of the first outdoor unit modules 2a and the cross valve 21 of the first outdoor unit modules 2a, the condensation in the outdoor heat exchanger 22 of the first outdoor unit modules 2a of high pressure gaseous refrigerant is dispelled the heat to defrost to outdoor heat exchanger 22, the liquid refrigerants of low-temp low-pressure is become after defrosting, this liquid refrigerants is discharged in the first common line 3 by the second control valve 25 again through the first outdoor unit modules 2a after first throttle element 23 throttling, liquid refrigerants in first common line 3 is expelled back in compressor 20 respectively by the 4th control valve 27 of the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c.Thus the defrost process completed the first outdoor unit modules 2a.After defrosting terminates, the first outdoor unit modules 2a reopens heating mode, and the second outdoor unit modules 2b and the 3rd outdoor unit modules 2c shuts down.
According to the defrosting control method of the multi-connected air conditioning system of the embodiment of the present invention; when one of them outdoor unit modules 2 defrosts; remaining outdoor unit modules 2 is still in heating mode; achieve multi-connected air conditioning system 100 continuous heating during defrosting; indoor set module 1 is not shut down, thus improves the comfortableness of multi-connected air conditioning system 100.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (11)
1. a multi-connected air conditioning system, is characterized in that, comprising:
Indoor set module, described indoor set module comprises at least one indoor heat exchanger;
The outdoor unit modules of multiple parallel connection, each described outdoor unit modules comprises:
Compressor, described compressor has exhaust outlet and air entry;
Cross valve, described cross valve comprises first to fourth valve port, and described first valve port is connected with described exhaust outlet, and described second valve port is connected with described air entry;
Outdoor heat exchanger, one end of described outdoor heat exchanger is connected with described 3rd valve port;
First throttle element, described first throttle element is connected with the other end of described outdoor heat exchanger;
First control valve, described first control valve is connected between described first throttle element and described indoor set module;
Second control valve, one end of described second control valve is connected to the pipeline between described first throttle element and described first control valve, and the other end of described second control valve is connected to the first common line;
3rd control valve, one end of described 3rd control valve is connected with described 4th valve port, and the other end of described 3rd control valve is connected to the second common line, and described second common line is connected with described indoor set module;
4th control valve, described one end of 4th control valve is connected with the second valve port of described cross valve, and the other end of described 4th control valve is connected with described first common line;
5th control valve, described one end of 5th control valve is connected with the first valve port of described cross valve, and the other end of described 5th control valve is connected with described second common line;
Wherein, when needing the outdoor unit modules defrosting one of them in described multiple outdoor unit modules being in heating mode, described second control valve in one of them outdoor unit modules described and described 5th control valve are opened, and described first control valve in remaining outdoor unit modules in described multiple outdoor unit modules, described 3rd control valve and described 4th control valve are opened.
2. multi-connected air conditioning system according to claim 1, it is characterized in that, each outdoor unit modules also comprises the first check valve, and described first check valve is connected between described first valve port and described exhaust outlet with from described exhaust outlet to one-way conduction on the direction of described first valve port.
3. multi-connected air conditioning system according to claim 1, it is characterized in that, each outdoor unit modules also comprises oil eliminator, and described oil eliminator is connected between described exhaust outlet and described first valve port, and the oil export of described oil eliminator is connected with described air entry.
4. multi-connected air conditioning system according to claim 3, is characterized in that, each outdoor unit modules also comprises second section fluid element, and described second section fluid element is connected between described oil export and described air entry.
5. multi-connected air conditioning system according to claim 1, it is characterized in that, each outdoor unit modules also comprises gas-liquid separator, described gas-liquid separator has entrance and gas vent, described gas vent is connected with described air entry, and described entrance is connected with described 4th control valve with described second valve port respectively.
6. multi-connected air conditioning system according to claim 1, is characterized in that, each outdoor unit modules also comprises the first stop valve, and described first stop valve is connected between described first control valve and described indoor set module.
7. multi-connected air conditioning system according to claim 1, is characterized in that, each outdoor unit modules also comprises the second stop valve, and described second stop valve is connected between described second control valve and described first common line.
8. multi-connected air conditioning system according to claim 1, it is characterized in that, each outdoor unit modules also comprises the 3rd stop valve, described 3rd stop valve is connected between described 3rd control valve and described second common line, and one end of described 5th control valve is connected between described 3rd control valve and described 3rd stop valve.
9. multi-connected air conditioning system according to claim 1, is characterized in that, each outdoor unit modules also comprises the 4th stop valve, and described 4th stop valve is connected between described 4th control valve and described first common line.
10. multi-connected air conditioning system according to claim 1, is characterized in that, described first control valve, described second control valve, described 3rd control valve, described 4th control valve and described 5th control valve are respectively magnetic valve.
The defrosting control method of 11. 1 kinds of multi-connected air conditioning systems, described multi-connected air conditioning system is the multi-connected air conditioning system according to any one of claim 1-10, it is characterized in that, described defrosting control method comprises the steps:
S1: when the outdoor unit modules being in heating mode in described multiple outdoor unit modules sends defrosting instruction, judge that whether all the other outdoor unit modules in described multiple outdoor unit modules are in running order;
S2: when all the other outdoor unit modules described are in heating mode, keep heating mode constant, the cross valve of a described outdoor unit modules is switched to refrigeration mode, and described first control valve in a described outdoor unit modules is closed, described 3rd control valve is closed, described 4th control valve is closed, described second control valve is opened, described 5th control valve is opened and described compressor shutdown;
When all the other outdoor unit modules described are in off-duty state; all the other outdoor unit modules described enter heating mode; and described first control valve of each outdoor unit modules in all the other outdoor unit modules described, described 3rd control valve and described 4th control valve are opened; the cross valve of a described outdoor unit modules is switched to refrigeration mode, and described first control valve in a described outdoor unit modules is closed, described 3rd control valve is closed, described 4th control valve is closed, described second control valve is opened, described 5th control valve is opened and described compressor shutdown.
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| CN109708216A (en) * | 2018-12-06 | 2019-05-03 | 珠海格力电器股份有限公司 | Modular multi-connected air conditioner system and its control method |
| WO2021047158A1 (en) * | 2019-09-11 | 2021-03-18 | 广东美的制冷设备有限公司 | Air conditioner and control method therefor |
| CN112984595A (en) * | 2021-03-10 | 2021-06-18 | 青岛海信日立空调系统有限公司 | Ground heating unit |
| WO2021218350A1 (en) * | 2020-04-30 | 2021-11-04 | 青岛海尔空调电子有限公司 | Air conditioning system control method and air conditioning system |
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| CN106288546B (en) * | 2016-09-09 | 2022-04-01 | 珠海格力电器股份有限公司 | Modular multi-split air conditioning system and defrosting control method thereof |
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| CN107642835B (en) * | 2017-10-16 | 2024-02-06 | 广东美的暖通设备有限公司 | Multi-split outdoor unit and multi-split with same |
| CN109708216A (en) * | 2018-12-06 | 2019-05-03 | 珠海格力电器股份有限公司 | Modular multi-connected air conditioner system and its control method |
| WO2021047158A1 (en) * | 2019-09-11 | 2021-03-18 | 广东美的制冷设备有限公司 | Air conditioner and control method therefor |
| WO2021218350A1 (en) * | 2020-04-30 | 2021-11-04 | 青岛海尔空调电子有限公司 | Air conditioning system control method and air conditioning system |
| CN112984595B (en) * | 2021-03-10 | 2022-04-19 | 青岛海信日立空调系统有限公司 | Ground heating unit |
| CN112984595A (en) * | 2021-03-10 | 2021-06-18 | 青岛海信日立空调系统有限公司 | Ground heating unit |
| US20220333837A1 (en) * | 2021-04-20 | 2022-10-20 | Guangdong Giwee Technology Co. Ltd. | Multi-outdoor unit parallel type non-reversing defrosting system and defrosting control method thereof |
| EP4083522A1 (en) * | 2021-04-20 | 2022-11-02 | Guangdong Giwee Technology Co., Ltd. | Multi-outdoor unit parallel type non-reversing defrosting system and defrosting control method thereof |
| US11994324B2 (en) | 2021-04-20 | 2024-05-28 | Guangdong Giwee Technology Co. Ltd. | Multi-outdoor unit parallel type non-reversing defrosting system and defrosting control method thereof |
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