CN114484586B - Modularized multi-connected unit and control method thereof - Google Patents
Modularized multi-connected unit and control method thereof Download PDFInfo
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- CN114484586B CN114484586B CN202210072982.XA CN202210072982A CN114484586B CN 114484586 B CN114484586 B CN 114484586B CN 202210072982 A CN202210072982 A CN 202210072982A CN 114484586 B CN114484586 B CN 114484586B
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 241000237983 Trochidae Species 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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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
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- 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
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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
- F24F11/88—Electrical aspects, e.g. circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a modular multi-connected unit and a control method thereof. The modular multi-connected unit comprises a plurality of outdoor units, branch circuits additionally arranged at inlets of outdoor heat exchangers of the outdoor units, communication branch circuits which connect all the branch circuits to enable each outdoor heat exchanger to be used by other outdoor units, first valves which control the outdoor units to be connected or disconnected with the communication branch circuits, second valves which control the outdoor heat exchangers of the outdoor units to participate or not participate in refrigerant circulation, and third valves which are matched with compressors of the outdoor units to enable the compressors to participate or not participate in refrigerant circulation. The invention improves the service cycle of the whole modularized unit by realizing the independent rotation of the compressor and the fan.
Description
Technical Field
The invention relates to the technical field of modular multi-connected units, in particular to a modular multi-connected unit with compressors or fans capable of independently rotating and a control method of the modular multi-connected unit.
Background
The multi-split system can realize the parallel connection of a plurality of units, namely the modularized installation of the units, and the flexible and diverse installation of the multi-split system can meet the requirements of various projects. In general, the modular multi-split air conditioner is rarely operated at full load during use, and some outdoor units may be in standby state. In order to prolong the service life of the unit, the unit is controlled alternately. The current common control is the rotation between the outer machine and the outer machine: and after the normal unit operates for a certain time, the operating external unit stops operating (the fan and the compressor both stop operating), and the unit which does not operate normally starts operating (the fan and the compressor operate synchronously). The premise of unit rotation is that the unit is operated for a preset time, but at the moment, the compressor and the fan can be continuously operated for a long time at a high frequency, the loads of the compressor and the fan are large, the fatigue degree is increased, and the service life of unit components is seriously influenced.
Disclosure of Invention
The invention provides a modular multi-connected unit and a control method thereof, and aims to solve the technical problem that in the prior art, the rotation of units needs to reach the preset time, so that a compressor or a fan is continuously operated for a long time at a high frequency, and the load is large.
The invention provides a modular multi-connected unit, which comprises a plurality of outdoor units, branch circuits additionally arranged at inlets of outdoor heat exchangers of the outdoor units, communication branch circuits for connecting all the branch circuits to enable each outdoor heat exchanger to be used by other outdoor units, first valves for controlling the outdoor units to be connected with or disconnected from the communication branch circuits, second valves for controlling the outdoor heat exchangers of the outdoor units to participate or not participate in refrigerant circulation, and third valves for matching with compressors of the outdoor units to enable the compressors to participate or not participate in refrigerant circulation.
The outdoor unit comprises a first valve, a second valve, a third valve, a compressor, a fan control module and a control module, wherein the first valve, the second valve, the third valve and the fourth valve are respectively connected with the outdoor unit through the control module, and the control module controls the first valve, the second valve, the third valve and the fourth valve of each outdoor unit according to a preset rule when part of the outdoor units are started, so that the compressors of the outdoor units or the fans of the outdoor heat exchangers are independently rotated.
Further, the compressor to be shut down is made according to any one of the operating frequency, the current, the temperature of the drive plate, the temperature of the top shell and the exhaust temperature of the compressor in the preset rule by turns and the upper limit time of the compressor by turns corresponding to the condition.
Further, the fan to be shut down is made according to any one of the operating frequency, the temperature of the driving board and the current corresponding to the fan and the rotation upper limit time corresponding to the condition in the preset rule.
Further, the preset rule is established according to the stop operation time by alternately using the compressor or the fan to be started.
Further, the first valve is an electronic expansion valve.
Further, the second valve includes an electronic expansion valve disposed on an outlet line of the outdoor heat exchanger.
Further, the third valve is a one-way valve arranged on a discharge pipeline of the compressor.
The invention also provides a control method of the modular multi-connected unit in the technical scheme, which comprises the following steps:
when partial outdoor units are started, judging whether compressors or fans to be shut down alternately exist or not;
and if the compressor or the fan with the longest stop running time exists, the compressor or the fan with the longest stop running time is correspondingly selected to rotate with the compressor or the fan to be shut down.
The modular multi-split unit heat exchanger is connected in a bypass mode, and the whole modular unit heat exchanger is shared. When part of outdoor units operate, the service cycle of the whole modularized unit is prolonged by independently rotating the compressor and the fan. The invention independently rotates the compressors or the fans according to the specific conditions of the compressors or the fans, so that the compressors and the fans can be stopped and rested in time when the pressure of the compressors and the fans is higher, and the service lives of the compressors and the fans are prolonged. The invention realizes that the running time of the fan and the compressor under high frequency is reduced by the independent rotation of the compressor and the fan in the modularized multi-split system, thereby prolonging the service life of devices and the service life of the whole modularized unit.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
fig. 1 is a schematic structural view of an outdoor unit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a plurality of outdoor units according to an embodiment of the present invention.
Fig. 3 is a refrigerant flow diagram of the dual-module multi-connected unit in refrigeration according to the embodiment of the present invention.
Fig. 4 is a refrigerant flow diagram in heating of the dual-module multi-connected unit according to the embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
As shown in fig. 1 and 2, the modular multi-connected unit of the present invention includes a plurality of outdoor units, which are denoted by reference numerals 1, 2, and 3, respectively. Fig. 1 shows a detailed structure of an outdoor unit connected to a main liquid pipe 100 and a main gas pipe 200, and including a compressor 10, an oil separator 80 provided on a discharge line of the compressor 10, a four-way valve 60 connected to the oil separator 80, an outdoor heat exchanger 20 connected to the four-way valve 60, a gas-liquid separator 90, and a subcooler 70.
On the basis of the existing multi-connected unit, the invention adds a branch 30 at the inlet of the outdoor heat exchanger 20 of the outdoor unit, and then connects the branches 30 of all the outdoor heat exchangers through a communicating branch 300, so that each outdoor heat exchanger 20 can be used by other outdoor units. Meanwhile, a first valve 40 for controlling the connection or disconnection of the outdoor units to the communication branch 300, a second valve 50 for controlling the participation or non-participation of the outdoor heat exchangers 20 of the outdoor units in the refrigerant circulation, and a third valve for cooperating with the compressors of the outdoor units to make the compressors 10 participate in the refrigerant circulation or not are provided.
In a specific embodiment, the first valves are respectively disposed on the branches in a one-to-one correspondence manner, and the second valve includes an electronic expansion valve disposed on the outlet pipeline of the outdoor heat exchanger, for example, in one embodiment, the second valve may be an electronic expansion valve disposed on the outlet pipeline of the outdoor heat exchanger, and in other embodiments, the second valve may include a valve disposed on a pipeline between the inlet and the branch of the outdoor heat exchanger, in addition to the electronic expansion valve disposed on the outlet pipeline of the outdoor heat exchanger. The third valve includes a one-way valve disposed on the discharge line of the compressor. For example, in one embodiment, the third valve is a one-way valve disposed in the discharge line of the compressor, and in other embodiments, the third valve may be a plurality of other valves that cooperate with each other.
In a preferred embodiment, the modular multi-connected unit further comprises a control module, and when the multi-connected unit is fully opened, the electronic expansion valves on the branches connected with the communication branches are closed, so that the system operates normally. When some outdoor units are started, the control module controls the first valve to the third valve of each outdoor unit according to a preset rule, so that the compressors of the outdoor units or the fans of the outdoor heat exchangers are independently rotated. In a specific embodiment, the preset rule is that the compressor to be shut down is made according to any one condition of the operating frequency, the current, the temperature of the drive plate, the temperature of the top shell and the exhaust temperature of the compressor and the rotation upper limit time corresponding to the condition. The fan to be shut down in turn in the preset rule is made according to any one condition of the operating frequency, the temperature of the driving plate and the current corresponding to the fan and the turn upper limit time corresponding to the condition. The preset rule is formed by formulating the compressors or fans to be started alternately according to the stop operation time.
In a first embodiment, the compressor or fan to be rotated is related to its own operating frequency and operating time, see tables 1, 2. When the frequency F of the compressor satisfies that F is more than 0 and less than or equal to F1, the compressor operates for T1 hours in the frequency range, which indicates that the compressor needs to be rotated. And at the moment, counting the stop operation time of all the compressors which are not operated, selecting the maximum stop operation time X, judging the X, and if the X is more than or equal to the set time X, stopping the compressors to be rotated and operating the compressors. When the fan runs and the preset time under the running frequency is reached, the fan executes alternate operation. And at the moment, counting the running stop time of all the fans which are not operated, selecting the maximum running stop time Y, judging Y, and if Y is more than or equal to the set time Y, stopping the original running fan and operating the fan.
| Compressor frequency/Hz | Run time/h |
| 0＜F≤F1 | T1 |
| F1＜F≤F2 | T2 |
| F2＜F≤F3 | T3 |
| F3＜F | T4 |
TABLE 1 frequency-based compressor rotation table
| Fan speed/rpm | Run time/h |
| 0＜n≤n1 | t1 |
| n1＜n≤n2 | t2 |
| n2＜n | t3 |
TABLE 2 Fan Replacing Table based on frequency
In a second embodiment, the compressor or fan to be rotated is related to its own operating temperature and operating time. See tables 3 and 4. The system detects the module temperature of each compressor and each fan in real time, and judges whether the compressor and the fan are rotated or not according to the module temperature, wherein the module temperature is the temperature of the driving plates of the compressor and the fan. When the compressor runs and reaches the preset running time corresponding to the temperature of the compressor module, the compressor executes the alternate operation. At the moment, the stop operation time of all the compressors which are not operated is counted, the maximum stop operation time X is selected, X is judged, if X is larger than or equal to the set time X, the originally operated compressor to be rotated stops, and the compressor operates. When the fan runs and reaches the preset running time corresponding to the temperature of the fan module, the fan executes alternate operation. And at the moment, counting the running stop time of all the fans which are not operated, selecting the maximum running stop time Y, judging Y, and if Y is more than or equal to the set time Y, stopping the original running fan to be rotated, and operating the fan.
| Compressor module temperature/° c | Run time/h |
| T ring < T ≤ T9 | T5 |
| T9＜T≤T10 | T6 |
| T10＜T≤T11 | T7 |
| T12＜T | T8 |
TABLE 3 compressor rotation table based on drive plate temperature
| Temperature/. Degree.C.of fan module | Run time/h |
| T is more than T and less than or equal to T7 | t4 |
| t8＜t≤t9 | t5 |
| t9＜t | t6 |
TABLE 4 Fan Replacing Table based on drive plate temperature
In the multi-module system, a plurality of compressors or fans simultaneously reach the rotation condition, if the number of the compressors or fans which do not run is less than the number of the compressors or fans which need to be rotated, the running frequencies of the compressors and fans which reach the rotation condition and are running or the temperatures of the modules are counted, and the compressor and the fan which have the highest frequency or the compressor and the fan which correspond to the modules and have the highest temperature are selected for rotation.
As shown in fig. 3 and 4, in a specific embodiment, the modular multi-connected unit may be a dual-module multi-connected unit.
The compressor and the fan of the initial unit are the same unit. For example: when the outdoor unit 1 is in an initial state and the outdoor unit 2 is in a standby state, and the compressor 11 of the outdoor unit 1 meets the rotation condition, the dual-module multi-connected unit rotates the compressor 11 of the outdoor unit 1 to the compressor 10 of the outdoor unit 2, that is, the compressor 11 stops, the one-way valve arranged on the discharge pipeline of the compressor closes the flow path of the compressor part of the outdoor unit 1, and the compressor 10 operates.
As shown in fig. 3, in the cooling mode, the first valves (electronic expansion valves) 40 and 41 of the branches 30 and 31 connected to the communication branch 300 are opened, the second valve (heating electronic expansion valve) 50 of the outdoor unit 2 is closed, and the second valve (heating electronic expansion valve) 51 of the outdoor unit 1 is opened. The refrigerant flows out of the compressor 10 of the outdoor unit 2, passes through the four-way valve 60, the first valve 40, and the first valve 41, flows through the outdoor heat exchanger 21 of the outdoor unit 1, enters the indoor unit for evaporation, and then enters the compressor 10 of the outdoor unit 2 through the main air pipe 200, thereby completing the refrigerant circulation.
As shown in fig. 4, in the heating mode, the first valves (electronic expansion valves) 40 and 41 of the branches 30 and 31 connected to the communication branch 300 are opened, the second valve (electronic expansion valve for heating) 50 of the outdoor unit 2 is closed, and the second valve (electronic expansion valve for heating) 51 of the outdoor unit 1 is opened. The refrigerant flows out of the compressor 10 of the outdoor unit 2, passes through the four-way valve 60, enters the indoor unit through the main air pipe 200, and after entering the outdoor heat exchanger 21 of the outdoor unit 1 through the main liquid pipe 100, the condensed refrigerant enters the outdoor unit 2 through the communication branch 300, passes through the four-way valve 60, and enters the compressor 10 of the outdoor unit 2, thereby completing refrigerant circulation.
When the initial unit is operated, the compressor and the fan may be compressors and fans of different outdoor units, for example, the compressor 11 of the outdoor unit 1 is operated, the fan of the outdoor heat exchanger 20 of the outdoor unit 2 is operated, and the compressor 11 of the outdoor unit 1 is alternatively switched to the compressor 10 of the outdoor unit 2.
At this time, the outdoor unit 1 is in a standby state corresponding to the normal operation of the outdoor unit 2. The first valve of the branch connected to the communication branch 300 is closed, and the second valve of the outdoor unit 2 is opened regardless of cooling or heating.
If the compressor and the fan of the initial unit are the same unit, for example, the outdoor unit 1 operates in the initial state, the outdoor unit 2 is in the standby state, and after the fan of the outdoor unit 1 reaches the rotation condition, the fan of the outdoor unit 1 needs to be stopped, the rotation is performed to the fan of the outdoor unit 2, and the compressor of the outdoor unit 1 continues to operate without rotation. Similarly, the first valve, the second valve, the third valve and the fourth valve can be controlled to realize the rotation of the outdoor heat exchanger. Similarly, if the compressor and the fan operated by the initial unit are different units, the rotation of the outdoor heat exchanger can also be performed in a similar manner.
The invention also provides a control method of the modular multi-connected unit, which is used for judging whether the compressors or fans to be switched off exist when part of the outdoor units are started. And if the current compressor or the fan exists, the corresponding compressor or the fan with the longest stop running time is selected to be rotated with the compressor or the fan to be shut down in rotation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a modularization multi-connected unit, includes a plurality of off-premises stations, its characterized in that still includes: the outdoor heat exchangers of the outdoor units are connected with a communication branch circuit, a first valve for controlling the outdoor units to be connected or disconnected with the communication branch circuit, a second valve for controlling the outdoor heat exchangers of the outdoor units to participate or not participate in refrigerant circulation, and a third valve for matching with the compressors of the outdoor units to make the compressors participate or not participate in refrigerant circulation;
when part of the outdoor units run, the independent rotation of the compressors or the fans is realized.
2. The modular multi-connected unit according to claim 1, further comprising a control module for controlling the first to third valves of each outdoor unit according to a preset rule when some outdoor units are turned on, so that the compressors of each outdoor unit or the fans of the outdoor heat exchangers are independently rotated.
3. The modular multi-connected unit as claimed in claim 2, wherein the preset rule is established by rotating the compressors to be shut down according to any one of an operating frequency, a current, a driving plate temperature, a top case temperature, and a discharge temperature of the compressors and a rotation upper limit time corresponding to the condition.
4. The modular multi-connected unit according to claim 2, wherein the fan to be shut down in turn in the preset rule is made according to any one of operating frequency, driving board temperature and current corresponding to the fan and turn upper limit time corresponding to the condition.
5. The modular multi-connected unit according to claim 2, wherein the preset rules are established according to the stop operation time by alternately rotating compressors or fans to be started.
6. The modular multi-connected unit according to claim 1, wherein the first valve is an electronic expansion valve.
7. The modular multi-connected unit as set forth in claim 1, wherein the second valve comprises an electronic expansion valve disposed on an outlet line of the outdoor heat exchanger.
8. The modular multi-connected unit as claimed in claim 1, wherein the third valve is a check valve disposed on a discharge line of a compressor.
9. The control method of the modular multi-connected unit according to any one of claims 1 to 8, comprising:
when partial outdoor units are started, judging whether compressors or fans to be shut down alternately exist or not;
and if the current running time of the compressor or the fan is the longest, the compressor or the fan with the longest stop running time is correspondingly selected to be alternated with the compressor or the fan to be shut down in alternation.
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| CN112444002A (en) * | 2020-11-30 | 2021-03-05 | 青岛海信日立空调系统有限公司 | Air conditioner |
| CN113154522A (en) * | 2021-04-25 | 2021-07-23 | 珠海格力电器股份有限公司 | Multi-connected air conditioner system and defrosting control method |
| CN113432187A (en) * | 2021-07-08 | 2021-09-24 | 宁波奥克斯电气股份有限公司 | Control method of multi-split air conditioning system and related device |
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