CN103375937B - Multi-connected air conditioning system and control method thereof - Google Patents
Multi-connected air conditioning system and control method thereof Download PDFInfo
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- CN103375937B CN103375937B CN201210107145.2A CN201210107145A CN103375937B CN 103375937 B CN103375937 B CN 103375937B CN 201210107145 A CN201210107145 A CN 201210107145A CN 103375937 B CN103375937 B CN 103375937B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004378 air conditioning Methods 0.000 title abstract description 8
- 238000005057 refrigeration Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000005494 condensation Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The invention discloses a multi-connected air conditioning system and a control method thereof. This many air conditioning systems that ally oneself with includes: a compressor (7); an indoor heat exchanger (9); a four-way valve (8); a first outdoor heat exchanger (1); a second outdoor heat exchanger (2); the pressure detection device (6) is used for detecting the system pressure of the multi-connected air-conditioning system; and the control main board (5) is connected with the pressure detection device (6) and is used for controlling the first outdoor heat exchanger (1) and/or the second outdoor heat exchanger (2) to work according to the system pressure. According to the invention, the work of one or two outdoor heat exchangers can be controlled according to the pressure of the system, so that the proper heat exchange quantity of the system can be maintained, the proper pressure of the system can be maintained, the control capability of the differential pressure of the system is improved, and the stability of the operation of the system is improved.
Description
Technical field
The present invention relates to field of air conditioning, in particular to a kind of multi-gang air conditioner and control method thereof.
Background technology
In water source multi-gang air conditioner, cold-producing medium in outdoor unit heat exchanger mainly through carrying out exchange heat with water, to reach the effect of condensation or evaporation.The size of outdoor unit heat exchanger affects the quality of system heat exchange.
Multi-gang air conditioner unit is in the process of actual motion, the heat exchange demand of outdoor condenser changes with the difference opening indoor set number, when refrigerant flow changes, if keep the exchange capability of heat of constant size, likely make the insufficient or undue condensation of condensation of refrigerant, make the force value of system can not remain in suitable scope, when the high pressure of system is higher or low pressure is on the low side, the height pressure reduction of the system that then may make increases, the power of unit is caused to increase, the power consumption of indirect adding users; When system high pressure is on the low side or low pressure is higher, be then easy to the height pressure reduction of reduction system, make cold-producing medium flows decrease in systems in which, underfed, cause that unit refrigerating capacity is not enough, oil return is difficult and cross valve can not the problem such as normal commutation.
For the problem of system pressure difference control effects difference in multiplex system in correlation technique, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is to provide a kind of multi-gang air conditioner and control method thereof, to solve the problem of system pressure difference control effects difference in multiplex system.
To achieve these goals, according to an aspect of the present invention, a kind of multi-gang air conditioner is provided.
Multi-gang air conditioner according to the present invention comprises: compressor; Indoor heat exchanger; Cross valve, first end is connected with the first end of compressor, and the second end of cross valve is connected with the second end of compressor, and the 3rd end of cross valve is connected with the first end of indoor heat exchanger; First outdoor heat exchanger, first end is connected with the 4th end of cross valve, and the second end is connected with the second end of indoor heat exchanger; Second outdoor heat exchanger, in parallel with the first outdoor heat exchanger; Pressure-detecting device, for detecting the system pressure of multi-gang air conditioner; And control mainboard, be connected with pressure-detecting device, for controlling the first outdoor heat exchanger and/or the second outdoor heat exchanger work according to system pressure.
Further, this system also comprises: the first valve, is positioned on the pipeline of the first outdoor heat exchanger, is connected with control mainboard; And second valve, be positioned on the pipeline of the second outdoor heat exchanger, be connected with control mainboard, wherein, control mainboard and be used for controlling the first valve and the second valve according to system pressure, to make the first outdoor heat exchanger and/or the second outdoor heat exchanger work.
Further, the heat exchange amount of the first outdoor heat exchanger is greater than the heat exchange amount of the second outdoor heat exchanger.
Further, pressure-detecting device is for detecting the pressure of close cross valve one end of the first outdoor heat exchanger and the second outdoor heat exchanger.
To achieve these goals, according to a further aspect in the invention, a kind of control method of multi-gang air conditioner is provided.
Control method according to multi-gang air conditioner of the present invention comprises: the system pressure P detecting multi-gang air conditioner; And according to the magnitude relationship of system pressure P and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work, wherein, this multi-gang air conditioner is any one multi-gang air conditioner provided by the invention.
Further, when multi-gang air conditioner freezes, predetermined system limiting pressure comprises predetermined system high pressure limit pressure P
the system high pressure upper limitwith predetermined system high pressure threshold pression P
system high pressure lower limit, wherein, according to the magnitude relationship of system pressure and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work comprises: as P > P
on system high pressure limittime, control the first outdoor heat exchanger and the second outdoor heat exchanger works simultaneously; And as P < P
system high pressure lower limittime, control the first outdoor heat exchanger work and the second outdoor heat exchanger quits work, or the second outdoor heat exchanger work of control and the first outdoor heat exchanger quit work.
Further, the heat exchange amount of the first outdoor heat exchanger is greater than the heat exchange amount of the second outdoor heat exchanger, P
system high pressure lower limitcomprise P
be 1 under system high pressureand P
system high pressure lower limit 2, and P
system high pressure lower limit 1> P
system high pressure lower limit 2, wherein, control the first outdoor heat exchanger work and the second outdoor heat exchanger quits work, or the second outdoor heat exchanger work of control and the first outdoor heat exchanger quit work and comprise: work as P
system high pressure lower limit 2≤ P < P
system high pressure lower limit 1time, control the first outdoor heat exchanger work and the second outdoor heat exchanger quits work; And as P < P
system high pressure lower limit 2time, control the first outdoor heat exchanger and quit work and the second outdoor heat exchanger work.
Further, when multi-gang air conditioner heats, predetermined system limiting pressure comprises predetermined system low pressure pressure upper limit P
the system low-voltage upper limitwith predetermined system low pressure threshold pression P
system low-voltage lower limit, wherein, according to the magnitude relationship of system pressure and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work comprises: as P < P
under system low-voltage limittime, control the first outdoor heat exchanger and the second outdoor heat exchanger works simultaneously; And as P > P
the system low-voltage upper limittime, control the first outdoor heat exchanger work and the second outdoor heat exchanger quits work, or the second outdoor heat exchanger work of control and the first outdoor heat exchanger quit work.
Further, the heat exchange amount of the first outdoor heat exchanger is greater than the heat exchange amount of the second outdoor heat exchanger, P
the system low-voltage upper limitcomprise P
the system low-voltage upper limit 1and P
the system low-voltage upper limit 2, and P
the system low-voltage upper limit 1< P
the system low-voltage upper limit 2, wherein, control the first outdoor heat exchanger work and the second outdoor heat exchanger quits work, or the second outdoor heat exchanger work of control and the first outdoor heat exchanger quit work and comprise: work as P
the system low-voltage upper limit 2>=P > P
the system low-voltage upper limit 1time, control the first outdoor heat exchanger work and the second outdoor heat exchanger quits work; And as P > P
the system low-voltage upper limit 2time, control the first outdoor heat exchanger and quit work and the second outdoor heat exchanger work.
Further, the system pressure detecting multi-gang air conditioner comprises: take Preset Time as interval, detects the system pressure of multi-gang air conditioner.
By the present invention, adopt the multi-gang air conditioner comprised with lower part: compressor; Indoor heat exchanger; Cross valve; Two outdoor heat exchangers parallel with one another; For detecting the pressure-detecting device of the system pressure of multi-gang air conditioner; And the control mainboard to be connected with pressure-detecting device, this control mainboard can control single or two outdoor heat exchanger work according to the size of system pressure, thus can the suitable heat exchange amount of keeping system, make the pressure that system keeps suitable, solve the problem of system pressure difference control effects difference in multiplex system, and then reach raising system pressure difference control ability, increase the effect of system run all right.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the multi-gang air conditioner according to the embodiment of the present invention;
Fig. 2 is the flow chart of multi-gang air conditioner control method according to a first embodiment of the present invention;
Fig. 3 is the flow chart of multi-gang air conditioner control method according to a second embodiment of the present invention; And
Fig. 4 is the flow chart of multi-gang air conditioner control method according to a third embodiment of the present invention.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Fig. 1 is the schematic diagram of the multi-gang air conditioner according to the embodiment of the present invention, as shown in Figure 1, this multi-gang air conditioner comprises: the first outdoor heat exchanger 1, second outdoor heat exchanger 2, first valve 3, second valve 4, control mainboard 5, pressure-detecting device 6, compressor 7, cross valve 8, indoor heat exchanger 9, temperature sensor 10, choke valve 11 and gas-liquid separator 12.
Wherein, first outdoor heat exchanger 1 is in parallel with the second outdoor heat exchanger 2, and A end is water inlet, and B end is delivery port, after in parallel, one end is connected to one end of indoor heat exchanger 9 through cross valve 8, and the other end after parallel connection is connected through the other end of choke valve 11 with indoor heat exchanger 9; Other two ends of cross valve 8 are connected with the suction end of gas-liquid separator 12 with the exhaust end of compressor 7 respectively, and gas-liquid separator 12 is placed between compressor 7 and cross valve 8; First valve 3 is positioned on the pipeline of the first outdoor heat exchanger 1, and the second valve 4 is positioned on the pipeline of the second outdoor heat exchanger 2; Control mainboard 5 to be connected respectively with choke valve 11 with the first valve 3, second valve 4, pressure-detecting device 6, temperature sensor 10.
Pressure-detecting device 6 is for detecting the system pressure of multi-gang air conditioner, control mainboard 5 and control the first valve 3 and the second valve 4 according to the system pressure detected, the exhaust end of compressor 7 is system high pressure, compressor 7 suction end is system low-voltage, when system high pressure is higher or low pressure is on the low side, controls the first valve 3 and the second valve 4 is all opened, work to make the first outdoor heat exchanger 1 and the second outdoor heat exchanger 2 simultaneously, reduce height pressure reduction, and then reduce the power of the assembling unit, save electric energy; When system high pressure is on the low side or low pressure is higher; control the first valve 3 to open; second valve 4 is closed, and to make the first outdoor heat exchanger 1 work independently, or control the second valve 4 is opened; first valve 3 is closed; to make the second outdoor heat exchanger 2 work independently, with the height pressure reduction of elevation system, make cold-producing medium in systems in which flow velocity speed; ensure sufficient refrigerating capacity, thus make cross valve 8 normal commutation.
In this embodiment, open or close control room external heat exchanger work by by-pass valve control, other control modes also can be adopted to control heat exchanger start and stop.
Adopt the multi-gang air conditioner that this embodiment provides, two heat exchangers in parallel are set in outdoor, and by pressure-detecting device real-time detecting system pressure, control mainboard according to system pressure, be also the size of multi-gang air conditioner inner refrigerant flow, suitable selection is carried out to two outdoor heat exchangers, control two heat exchangers work simultaneously or work independently, in order to the heat exchange amount that keeping system is suitable, make the pressure that system can keep suitable, increase the stability that air-conditioning system is run.
In order to further control system pressure is in suitable scope, preferably, the heat exchange amount of the first outdoor heat exchanger 1 is greater than the heat exchange amount of the second outdoor heat exchanger 2, system high pressure comparatively large or low pressure on the low side higher larger time, control the first outdoor heat exchanger 1 to work, system high pressure less or low pressure on the low side higher less time, control the second outdoor heat exchanger 2 and work.
In order to accurate control system pressure, preferably, pressure-detecting device 6 is arranged near two heat exchangers, for detecting the inlet pressure of the first outdoor heat exchanger 1 and the second outdoor heat exchanger 2.
Fig. 2 is the flow chart of multi-gang air conditioner control method according to a first embodiment of the present invention, as shown in Figure 2, this multi-gang air conditioner is any one multi-gang air conditioner in this detailed description of the invention, wherein, the outdoor heat exchanger of this multi-gang air conditioner comprises two heat exchangers in parallel, and this control method comprises following step S102 and step S104.
Step S102: the system pressure P detecting multi-gang air conditioner.
Step S104: according to the magnitude relationship of system pressure P and predetermined system limiting pressure, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work.
The control method of the multi-gang air conditioner adopting this embodiment to provide, real-time detecting system pressure, according to the system pressure detected, also be the size of multi-gang air conditioner inner refrigerant flow, control the first outdoor heat exchanger and/or the second outdoor heat exchanger work, in order to the heat exchange amount that keeping system is suitable, make the pressure that system keeps suitable, increase the stability that air-conditioning system is run.
Fig. 3 is the flow chart of multi-gang air conditioner control method according to a second embodiment of the present invention, in this multi-gang air conditioner, off-premises station has the different heat exchanger of two heat exchange amounts, on two heat exchange manifolds, be provided with magnetic valve simultaneously, near two heat exchangers, be provided with pressure sensor, and be preset with P in control mainboard
system high pressure lower limit 1, P
system high pressure lower limit 2, P
the system high pressure upper limit, and P
system high pressure lower limit 2< P
system high pressure lower limit 1< P
the system high pressure upper limit.
As shown in Figure 3, when unit refrigerating operaton, the pressure that pressure sensor detects is the high-voltage value of system, after refrigeration start, controls the high-voltage value P1 of mainboard every 40s detection system, and with the P preset
system high pressure lower limit 1, P
under system high pressure limit 2, P
the system high pressure upper limitcompare:
As the pressure value P 1 > P detected
the system high pressure upper limittime, then two magnetic valves are all opened, and allow two heat exchangers all participate in heat exchange, promote heat exchange amount, reduce system high pressure to desired value;
Work as P
the system high pressure upper limit>=P1>=P
system high pressure lower limit 1time, then magnetic valve maintains current state;
Work as P
system high pressure lower limit 2≤ P1 < P
system high pressure lower limit 1time, then open the magnetic valve that heat exchanger is larger, close the magnetic valve that heat exchanger is less, larger heat exchanger participates in heat exchange, and reduce heat exchange amount, elevator system high pressure is to desired value;
As P1 < P
system high pressure lower limit 2time, then close the larger magnetic valve of heat exchanger, open the magnetic valve that heat exchanger is less, less heat exchanger participates in heat exchange.
Wherein, after changing the state of magnetic valve, continue the force value of the import of sensing chamber's external heat exchanger, and keep magnetic valve state according to the force value detected or again change magnetic valve state, thus, the high-voltage value of system is finally made to remain in suitable scope.
Fig. 4 is the flow chart of multi-gang air conditioner control method according to a third embodiment of the present invention, in this multi-gang air conditioner, off-premises station has the different heat exchanger of two heat exchange amounts, pressure sensor is provided with near two heat exchangers, on two heat exchange manifolds, be provided with magnetic valve simultaneously, and be preset with P in control mainboard
system low-voltage lower limit, P
the system low-voltage upper limit 1, P
the system low-voltage upper limit 2, and P
system low-voltage lower limit< P
the system low-voltage upper limit 1< P
the system low-voltage upper limit 2.
As shown in Figure 4, when unit heating operation, the pressure that pressure sensor detects is the low voltage value of system, after heating start, controls the low voltage value P2 of mainboard every 40s detection system, and with the P preset
system low-voltage lower limit, P
the system low-voltage upper limit 1, P
the system low-voltage upper limit 2compare:
As the pressure value P 2 < P detected
system low-voltage lower limittime, then two magnetic valves are all opened, and allow two heat exchangers participate in heat exchange, promote heat exchange amount, make the low pressure of system be increased to desired value;
Work as P
the system low-voltage upper limit 1>=P2>=P
system low-voltage lower limittime, then magnetic valve maintains current state;
Work as P
the system low-voltage upper limit 2>=P2 > P
the system low-voltage upper limit 1time, condenser inner refrigerant and water heat exchange abundance are described, then close the less magnetic valve of heat exchanger;
As P2 > P
the system low-voltage upper limit 2time, then close the larger magnetic valve of heat exchanger, only allow less heat exchanger participate in heat exchange, reduce heat exchange amount, reduce low pressure to desired value.
Wherein, after changing the state of magnetic valve, continue the force value of the import of sensing chamber's external heat exchanger, and keep magnetic valve state according to the force value detected or again change magnetic valve state, thus, the low voltage value of system is finally made to remain in suitable scope.
From above description, can find out, present invention achieves following technique effect: two heat exchangers in parallel are set in outdoor, control mainboard, according to system pressure, suitable selection is carried out to two outdoor heat exchangers, control two heat exchangers work simultaneously or work independently, thus the heat exchange amount that keeping system is suitable, make the pressure that system can keep suitable, increase the stability that air-conditioning system is run.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a multi-gang air conditioner, comprising:
Compressor (7);
Indoor heat exchanger (9);
Cross valve (8), first end is connected with the first end of described compressor (7), second end of described cross valve (8) is connected with the second end of described compressor (7), and the 3rd end of described cross valve (8) is connected with the first end of described indoor heat exchanger (9);
It is characterized in that, also comprise:
First outdoor heat exchanger (1), first end is connected with the 4th end of described cross valve (8), and the second end is connected with the second end of described indoor heat exchanger (9);
Second outdoor heat exchanger (2), in parallel with described first outdoor heat exchanger (1);
Pressure-detecting device (6), for detecting the system pressure of described multi-gang air conditioner; And
Control mainboard (5), be connected with described pressure-detecting device (6), for controlling described first outdoor heat exchanger (1) and/or described second outdoor heat exchanger (2) work according to described system pressure.
2. multi-gang air conditioner according to claim 1, is characterized in that, also comprises:
First valve (3), is positioned on the pipeline of described first outdoor heat exchanger (1), is connected with described control mainboard (5); And
Second valve (4), is positioned on the pipeline of described second outdoor heat exchanger (2), is connected with described control mainboard (5),
Wherein, described control mainboard (5), for controlling described first valve (3) and described second valve (4) according to described system pressure, works to make described first outdoor heat exchanger (1) and/or described second outdoor heat exchanger (2).
3. multi-gang air conditioner according to claim 1 and 2, is characterized in that, the heat exchange amount of described first outdoor heat exchanger (1) is greater than the heat exchange amount of described second outdoor heat exchanger (2).
4. multi-gang air conditioner according to claim 1 and 2, it is characterized in that, described pressure-detecting device (6) is for detecting the pressure of close described cross valve (8) one end of described first outdoor heat exchanger (1) and described second outdoor heat exchanger (2).
5. a control method for multi-gang air conditioner, is characterized in that, described multi-gang air conditioner is multi-gang air conditioner according to claim 1, and described control method comprises:
Detect the system pressure P of described multi-gang air conditioner; And
According to the magnitude relationship of described system pressure P and predetermined system limiting pressure, control described first outdoor heat exchanger (1) and/or described second outdoor heat exchanger (2) work.
6. control method according to claim 5, is characterized in that, when described multi-gang air conditioner refrigeration, described predetermined system limiting pressure comprises predetermined system high pressure limit pressure P
the system high pressure upper limitwith predetermined system high pressure threshold pression P
system high pressure lower limit, wherein, according to the magnitude relationship of described system pressure and predetermined system limiting pressure, control described first outdoor heat exchanger (1) and/or described second outdoor heat exchanger (2) work comprises:
As P > P
the system high pressure upper limittime, control described first outdoor heat exchanger (1) and described second outdoor heat exchanger (2) works simultaneously; And
As P < P
system high pressure lower limittime, control described first outdoor heat exchanger (1) work and described second outdoor heat exchanger (2) quit work, or control described second outdoor heat exchanger (2) work and described first outdoor heat exchanger (1) quit work.
7. control method according to claim 6, is characterized in that, the heat exchange amount of described first outdoor heat exchanger (1) is greater than the heat exchange amount of described second outdoor heat exchanger (2), described P
system high pressure lower limitcomprise P
system high pressure lower limit 1and P
system high pressure lower limit 2, and P
system high pressure lower limit 1> P
system high pressure lower limit 2wherein, control the work of described first outdoor heat exchanger (1) and described second outdoor heat exchanger (2) quits work, or control the work of described second outdoor heat exchanger (2) and described first outdoor heat exchanger (1) quits work and comprises:
Work as P
system high pressure lower limit 2≤ P < P
high system pressure limit 1time, control described first outdoor heat exchanger (1) work and described second outdoor heat exchanger (2) quit work; And
As P < P
system high pressure lower limit 2time, control described first outdoor heat exchanger (1) and quit work and described second outdoor heat exchanger (2) work.
8. control method according to claim 5, is characterized in that, when described multi-gang air conditioner heats, described predetermined system limiting pressure comprises predetermined system low pressure pressure upper limit P
the system low-voltage upper limitwith predetermined system low pressure threshold pression P
system low-voltage lower limit, wherein, according to the magnitude relationship of described system pressure and predetermined system limiting pressure, control described first outdoor heat exchanger and/or described second outdoor heat exchanger work comprises:
As P < P
system low-voltage lower limittime, control described first outdoor heat exchanger (1) and described second outdoor heat exchanger (2) works simultaneously; And
As P > P
the system low-voltage upper limittime, control described first outdoor heat exchanger (1) work and described second outdoor heat exchanger (2) quit work, or control described second outdoor heat exchanger (2) work and described first outdoor heat exchanger (1) quit work.
9. control method according to claim 8, is characterized in that, the heat exchange amount of described first outdoor heat exchanger (1) is greater than the heat exchange amount of described second outdoor heat exchanger (2), described P
the system low-voltage upper limitcomprise P
the system low-voltage upper limit 1and P
system the low pressure upper limit 2, and P
the system low-voltage upper limit 1< P
the system low-voltage upper limit 2wherein, control the work of described first outdoor heat exchanger (1) and described second outdoor heat exchanger (2) quits work, or control the work of described second outdoor heat exchanger (2) and described first outdoor heat exchanger (1) quits work and comprises:
Work as P
the system low-voltage upper limit 2>=P > P
the system low-voltage upper limit 1time, control described first outdoor heat exchanger (1) work and described second outdoor heat exchanger (2) quit work; And
As P > P
the system low-voltage upper limit 2time, control described first outdoor heat exchanger (1) and quit work and described second outdoor heat exchanger (2) work.
10. the control method according to any one of claim 5 to 9, is characterized in that, the system pressure detecting described multi-gang air conditioner comprises:
Be interval with Preset Time, detect the system pressure of described multi-gang air conditioner.
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| CN201210107145.2A CN103375937B (en) | 2012-04-12 | 2012-04-12 | Multi-connected air conditioning system and control method thereof |
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| CN104748431B (en) * | 2015-03-31 | 2017-05-03 | 广东美的暖通设备有限公司 | multiple on-line system |
| CN104748430B (en) * | 2015-03-31 | 2018-02-06 | 广东美的暖通设备有限公司 | Multiple on-line system |
| CN104748425B (en) * | 2015-03-31 | 2017-03-08 | 广东美的暖通设备有限公司 | The off-premises station assembly of multiple on-line system and multiple on-line system |
| CN104748424B (en) * | 2015-03-31 | 2017-06-06 | 广东美的暖通设备有限公司 | The outdoor unit component and the multiple on-line system with it of multiple on-line system |
| CN111426106A (en) * | 2020-05-11 | 2020-07-17 | 珠海格力电器股份有限公司 | Cold water air conditioner, cooling water unit thereof and cooling water control method |
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| JP2914783B2 (en) * | 1991-06-05 | 1999-07-05 | 株式会社東芝 | Air conditioner |
| CN1301392C (en) * | 2005-04-06 | 2007-02-21 | 广东科龙电器股份有限公司 | Adaptive variable throttling air conditioner |
| CN101240962B (en) * | 2008-01-18 | 2010-06-02 | 西安交通大学 | Carbon dioxide heat pump control method based on pressure-temperature |
| CN101338948A (en) * | 2008-05-09 | 2009-01-07 | 浙江盾安人工环境设备股份有限公司 | Refrigeration system provided with electronic expansion valve opening control device |
| CN101818975B (en) * | 2010-05-12 | 2012-06-06 | 艾默生网络能源有限公司 | Air conditioner in machine room |
| CN202521935U (en) * | 2012-04-12 | 2012-11-07 | 珠海格力电器股份有限公司 | Multi-connected air conditioning system |
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Effective date of registration: 20200709 Address after: Room 317, 416 jingwan Road, Jingan Town, Doumen District, Zhuhai City, Guangdong Province Patentee after: Zhuhai Gree Electromechanical Engineering Co.,Ltd. Address before: 519070 Guangdong city of Zhuhai Province Qianshan No. six Patentee before: GREE ELECTRIC APPLIANCES,Inc.OF ZHUHAI |