CN101776308A - Energy-saving air conditioner - Google Patents

Energy-saving air conditioner Download PDF

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Publication number
CN101776308A
CN101776308A CN200910036603A CN200910036603A CN101776308A CN 101776308 A CN101776308 A CN 101776308A CN 200910036603 A CN200910036603 A CN 200910036603A CN 200910036603 A CN200910036603 A CN 200910036603A CN 101776308 A CN101776308 A CN 101776308A
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China
Prior art keywords
air
conditioning
heat exchanger
check valve
energy
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CN200910036603A
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Chinese (zh)
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CN101776308B (en
Inventor
汪俊勇
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN2009100366036A priority Critical patent/CN101776308B/en
Publication of CN101776308A publication Critical patent/CN101776308A/en
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Abstract

The invention provides an energy-saving air conditioner. The overall performance of the air conditioner is enhanced by controlling the supercooling degree/superheating degree of the air-conditioning system, and simultaneously, the reliability of the air conditioner is improved. The air conditioner comprises a control system, an outdoor air-conditioning unit, an indoor air-conditioning unit and a plurality of refrigerant tubes connected between the outdoor air-conditioning unit and the indoor air-conditioning unit; the outdoor air-conditioning unit comprises a compressor, an outdoor unit heat exchanger and a throttling device, which are connected through a plurality of refrigerant tubes; the indoor air-conditioning unit comprises an indoor unit heat exchanger; the outdoor air-conditioning unit is provided with a supercooling degree increaser, which comprises a throttling mechanism and a heat exchanger mechanism; the supercooling degree increaser is connected with one of the refrigerant tubes of the outdoor air-conditioning unit, and the refrigerant tube connected with the supercooling degree increaser is branched into an auxiliary branch and a main flow passage; the throttling mechanism is arranged on the auxiliary branch, the auxiliary branch and the main flow passage are jointed at the position of the heat exchange mechanism and carry out heat exchange; and the auxiliary branch is connected with the low-pressure side of the compressor.

Description

A kind of energy-saving air-conditioning device
Technical field
The invention belongs to air-conditioning technical field, be specifically related to a kind of novel energy-saving air-conditioning device that can improve degree of supercooling/degree of superheat.
Background technology
According to the pressure-enthalpy chart of air-conditioning system as can be known, degree of supercooling is big more, the refrigerating capacity of air-conditioning system is just big more, the existing device that is applied in the similar raising degree of supercooling on the air-conditioning mainly contains two kinds, the first realizes by extraneous cold water, increase a water route circulation because of in actual applications more, to the user use and installation brings inconvenience, seldom in the common air-conditioning system, use.It two is degree of supercooling degrees of superheat that high-voltage tube by system and the temperature difference between the low-voltage tube and pressure sensor, temperature sensor and control module are controlled machine system, the control system complexity, therefore the cost height often only uses on types such as multi-joint machine, and common air-conditioning is seldom used.
Because of all carrying out the high energy efficiency product in present each field, wherein air conditioner industry is also being drafted the minimum efficiency threshold of execution, simply improved the cold degree of superheat by increasing the air conditioner two-unit heat exchange area, not only the cost increase is very big thereby reach the method that improves efficiency, and the size of complete machine also increases.
Therefore, design a kind of desirable energy-saving air-conditioning device that can improve degree of supercooling/degree of superheat, be very important.
Summary of the invention
The object of the present invention is to provide a kind of energy-saving air-conditioning device, improve the performance of air conditioner, and improve the reliability of complete machine by the degree of supercooling/degree of superheat of control air-conditioning system.
The present invention is achieved through the following technical solutions:
A kind of energy-saving air-conditioning device includes control system, air-conditioner outdoor unit, indoor apparatus of air conditioner and is connected in many refrigerant pipes between described air-conditioner outdoor unit, the indoor set; Refrigerant circulates in described refrigerant pipe; Described air-conditioner outdoor unit includes compressor, off-premises station heat exchanger and throttling arrangement, and described compressor, off-premises station heat exchanger and throttling arrangement all connect by many refrigerant pipes; Described indoor apparatus of air conditioner includes the indoor set heat exchanger; Described air-conditioner outdoor unit is provided with and improves the degree of supercooling device, and described raising degree of supercooling device includes throttle mechanism and heat exchange mechanisms; Described raising degree of supercooling device is connected with wherein refrigerant pipe of described air-conditioner outdoor unit, and the refrigerant pipe that described connection improves the degree of supercooling device is branched off into: auxiliary branch and primary flow path; Described throttle mechanism is arranged on the auxiliary branch, and described auxiliary branch and primary flow path are converged at the heat exchange mechanisms place and carried out heat exchange; Described auxiliary branch is connected with the compressor low-pressure side.
Described throttle mechanism is a kind of electric expansion valve or capillary.
Described heat exchange mechanisms be a kind of be to adopt double pipe heat exchanger or the parallel welded type heat exchanger of a kind of copper pipe.
To sum up, the invention has the beneficial effects as follows:
A kind of energy-saving air-conditioning device of patent application of the present invention, the raising degree of supercooling device of its setting, not only can improve the degree of supercooling of condenser side, improve complete machine capability, can improve simultaneously the suction side degree of superheat of compressor, can effectively prevent the difficult problem of compressor band liquid when worst cold case moves, therefore adopt this device that machine performance and reliability are all improved a lot.
The technical program specifically has the following advantages:
1, the degree of supercooling of unit condenser side can be improved, the complete machine performance can be improved;
2, can improve the degree of superheat of suction side, especially during cold operation, can effectively prevent the operation of compressor band liquid, can improve the reliability of complete machine;
3, improving the degree of supercooling device all is suitable in single cooler group and source pump;
4, compact conformation, easy for installation, improving the degree of supercooling device can independently be installed on the off-premises station as parts, need not to increase on unit extra water route circulation.Can on the contour structures basis of invariable of former organic type, increase this degree of supercooling device;
5, control is simple, need not complicated control program, also need not to consider to connect how many indoor sets;
6, cost is low, saves raw material.If aircondition is provided with all temps sensor and pressure sensor, accurately control, cost is lower.
Description of drawings
Fig. 1 is the raising degree of supercooling apparatus structure schematic diagram of a kind of energy-saving air-conditioning device of the present invention;
Fig. 2 is the pressure-enthalpy chart of a kind of energy-saving air-conditioning device of the present invention;
Fig. 3 is the heat exchange mechanisms structural representation of a kind of energy-saving air-conditioning device of the present invention;
Fig. 4 is the another kind of structural representation of the heat exchange mechanisms of a kind of energy-saving air-conditioning device of the present invention;
Fig. 5 is the concrete installation site schematic diagram of raising degree of supercooling device in single cold air conditioning system of a kind of energy-saving air-conditioning device of the present invention;
Fig. 6 is the concrete installation site schematic diagram of raising degree of supercooling device in heat pump type air conditioning system of a kind of energy-saving air-conditioning device of the present invention.
Description of reference numerals:
10, improve the degree of supercooling device, 11, throttle mechanism, 12, heat exchange mechanisms, 13, auxiliary branch, 20, primary flow path, 121, sleeve pipe, 15, side-walls, 30, compressor, 32, gas-liquid separator, 31, oil eliminator, 40, cross valve, 50, the off-premises station heat exchanger, 60, check valve apparatus, 61, first check valve, the 63, the 3rd check valve, 62, second check valve, the 64, the 4th check valve, 70, the high pressure fluid reservoir, 91, first stop valve, 92, second stop valve, 100, the indoor set heat exchanger.
The specific embodiment
The present invention discloses a kind of energy-saving air-conditioning device, as shown in Figure 1, includes control system, air-conditioner outdoor unit, indoor apparatus of air conditioner and is connected in many refrigerant pipes between described air-conditioner outdoor unit, the indoor set; Refrigerant circulates in described refrigerant pipe; Described air-conditioner outdoor unit includes compressor, off-premises station heat exchanger and throttling arrangement, and described compressor, off-premises station heat exchanger and throttling arrangement all connect by many refrigerant pipes; Described indoor apparatus of air conditioner includes the indoor set heat exchanger; Wherein: described air-conditioner outdoor unit is provided with and improves degree of supercooling device 10, and described raising degree of supercooling device includes throttle mechanism 11 and heat exchange mechanisms 12; Described raising degree of supercooling device is connected with wherein refrigerant pipe of described air-conditioner outdoor unit, and the refrigerant pipe that described connection improves the degree of supercooling device is branched off into: auxiliary branch 13 and primary flow path 20; Described throttle mechanism 11 is arranged on the auxiliary branch 13, and described auxiliary branch 13 and primary flow path 20 are converged at heat exchange mechanisms 12 places and carried out heat exchange; Described auxiliary branch 13 is connected with the compressor low-pressure side.
Described throttle mechanism 11 is a kind of electric expansion valve or capillary.
The benefit of electric expansion valve is to regulate in real time the size of degree of supercooling, more is applicable to capacity-variable air conditioner systems such as multi-joint machine, frequency changer; Fixed frequency air conditioner system for common one-to-one can select the cheap capillary-compensated of price comparison for use, and shortcoming is can only determine a degree of supercooling with capillary, can't carry out range regulation to degree of supercooling.
Described heat exchange mechanisms 12 for a kind of be to adopt double pipe heat exchanger or the parallel welded type heat exchanger of a kind of copper pipe.
As shown in Figure 3, described heat exchange mechanisms 12 adopts the double-tube heat exchanger structure, and primary flow path 20 is passed the middle part of described heat exchange mechanisms 12, and auxiliary branch 13 is communicated with sleeve pipe 121, and sleeve pipe 121 is nested in primary flow path 20 outsides; The appearance of sleeve pipe 121 is incubated with the heat-preservation cotton parcel.
As shown in Figure 4, described heat exchange mechanisms 12 adopts the parallel welded type heat exchanger structure of copper pipe, and primary flow path 20 is two parallel copper pipes with auxiliary branch 13, and the side-walls 15 of described primary flow path 20 and auxiliary branch 13 adopts the mode of welding to be connected; The appearance of described primary flow path 20 and auxiliary branch 13 is incubated with the heat-preservation cotton parcel.
The size of described heat exchange mechanisms 12 can be determined according to the size of actual type and the degree of supercooling of needs.
As shown in Figure 2, from pressure-enthalpy chart as can be known degree of supercooling from Δ T=T 3-T 4Bring up to Δ T '=T 3-T 4' complete machine capability also brings up to Q '=A * (h from Q=A * (h1-h5) 1-h 5'), simultaneously because of after bypass branch road and the primary flow path heat exchange, bypass branch road temperature can increase, and has improved suction temperature with air-breathing the mixing after entering suction side, thereby has improved the degree of superheat of suction side, has improved the reliability of air conditioner.
Among Fig. 2, ordinate P refers to system pressure, and abscissa h refers to the enthalpy of system's each point.
1 → 2nd, the compression process of compressor, 2 → 4th, condensation process, 4 → 5th, throttling process, 5 → 1st, evaporation process, T represents the refrigerant temperature of certain point, and Δ T represents degree of supercooling, and h represents the refrigerant enthalpy of certain point, and A represents the refrigerant mass flow, Q represents refrigerating capacity.
Embodiment one:
As shown in Figure 5, described aircondition is a kind of single cold air conditioning system, and the low-pressure side of compressor 30 is provided with gas-liquid separator 32, and the high-pressure side of compressor 30 is provided with oil eliminator 31; Indoor set heat exchanger 100 is connected with described gas-liquid separator 32, and off-premises station heat exchanger 50 is connected with described oil eliminator 31.
Connect by stop valve 91,92 between described air-conditioner outdoor unit, the indoor apparatus of air conditioner.
The port of export of described off-premises station heat exchanger 50 connects a high pressure fluid reservoir 70, and described off-premises station heat exchanger 50 connects the inlet of high pressure fluid reservoir 70; Improving degree of supercooling device 10 is connected with the outlet of described high pressure fluid reservoir 70.
Described axle helps branch road 13 through after the heat exchange mechanisms 12, connects gas-liquid separator 32; Primary flow path 20 is connected with throttling arrangement 70 through after the heat exchange mechanisms 12.
Embodiment two:
As shown in Figure 6, described aircondition is a kind of heat pump type air conditioning system, be with single cold air conditioning system difference: described aircondition is provided with a cross valve 40, and 4 interfaces of described cross valve 40 connect respectively: indoor set heat exchanger 100, gas-liquid separator 32, oil eliminator 31 and off-premises station heat exchanger 50.
Described aircondition is provided with check valve apparatus 60, and described check valve apparatus 60 includes two groups of check valve assemblies that are connected in parallel, that is: check valve assembly one and check valve assembly two; Described check valve assembly one includes first check valve 61 and the 3rd check valve 63 of reverse setting, and described check valve assembly two includes second check valve 62 and the 4th check valve 64 of reverse setting; The inlet of high pressure fluid reservoir 70 and primary flow path 20 connect the centre position of described check valve assembly one and check valve assembly two respectively.
Aircondition of the present invention, essence is exactly to increase an auxiliary branch at condensator outlet, refrigerant in the auxiliary branch carries out heat exchange through throttling step-down cooling back with primary flow path, reduce the temperature of primary flow path, thereby improve the purpose of the degree of supercooling of primary flow path, auxiliary branch carries out directly getting back to compressor low-pressure side (suction side) after the heat exchange.Then need to increase the check valve assembly device for heat pump type air conditioning system, for single cold air-conditioning unit, this check valve apparatus can be cancelled.
Aircondition of the present invention, during refrigeration: the high temperature and high pressure gas that compressor is discharged enters oil eliminator, the oil that oil eliminator will separate returns suction side, separated refrigerant enters the cross valve commutation, flowing to the off-premises station heat exchanger after the commutation cools off, the liquid refrigerants of the cryogenic high pressure of cooling flows to the high pressure fluid reservoir through second check valve 62, the high-pressure liquid refrigerant that fluid reservoir comes out is through improving the degree of supercooling device, the refrigerant of the low-temp low-pressure after the throttling of part auxiliary branch and the refrigerant of main branch road carry out heat exchange, improve the degree of supercooling of primary flow path, auxiliary branch enters gas-liquid separator through becoming refrigerant vapour after the heat exchange, finally gets back to suction side; Further cooling behind the cryogenic high pressure refrigerant process degree of supercooling device of primary flow path, the degree of supercooling increase also flows to the throttling arrangement throttling, the saturated liquid refrigerants that dams into low temperature, low pressure flows to the indoor set heat exchanger through the 3rd check valve 63 and evaporates, low-temperature low-pressure refrigerant steam after evaporating is got back to behind the gas-liquid separator and auxiliary branch bout, the suction side that finally enters compressor through cross valve.
When heating: the high temperature and high pressure gas that compressor is discharged enters oil eliminator, the oil that oil eliminator will separate returns suction side, separated refrigerant enters the cross valve commutation, flow to the indoor set heat exchanger after the commutation and cool off heat release, the liquid refrigerants of the cryogenic high pressure of cooling flows to high pressure fluid reservoir 70 through the 4th check valve 64, the high-pressure liquid refrigerant that high pressure fluid reservoir 70 comes out is through the degree of supercooling device, the refrigerant of the low-temp low-pressure after the throttling of part auxiliary branch and the refrigerant of main branch road carry out heat exchange, improve the degree of supercooling of primary flow path, auxiliary branch enters gas-liquid separator and mixes with primary flow path through becoming refrigerant vapour after the heat exchange, and can improve the degree of superheat of primary flow path, finally get back to suction side; Further cooling behind the cryogenic high pressure refrigerant process degree of supercooling device of primary flow path, flow to the throttling arrangement throttling again after increasing degree of supercooling, the saturated liquid refrigerants of the low temperature after the throttling, low pressure flows to the off-premises station heat exchanger through check valve 61 and evaporates, and the low-temperature low-pressure refrigerant steam after evaporating converges the suction side that flows to compressor with auxiliary branch after getting back to gas-liquid separator through cross valve.
Install improving the degree of supercooling device for source pump must points for attention:
Can increase as shown in Figure 6 check valve apparatus or similarly non-return device can control degree of supercooling/degree of superheat when cooling and warming to guarantee the import and export invariant position of refrigerant at the degree of supercooling device.
Improve check valve in parallel on the degree of supercooling device at this, can improve degree of supercooling in the time of refrigeration, from the check valve process, can only under the situation of refrigeration, control degree of supercooling/degree of superheat like this when heating.
The electric expansion valve that will improve when heating on the supercooling apparatus closes extremely, and it is inoperative to improve the degree of supercooling device when heating, and just opens electronic expansion valve controls degree of supercooling/degree of superheat during refrigeration.
Under the situation that does not have wherein one or more auxiliary elements such as oil eliminator, gas-liquid separator, high pressure fluid reservoir in the air-conditioning system, also can use this degree of supercooling device.
Also can use this degree of supercooling device for the air-conditioning that does not have wherein one or more auxiliary elements such as oil eliminator, gas-liquid separator, high pressure fluid reservoir in the system.
Above-mentioned listed specific implementation is nonrestrictive, to one skilled in the art, is not departing from the scope of the invention, and various improvement and the variation carried out all belong to protection scope of the present invention.For example, concrete form of heat exchange mechanisms 12 etc.

Claims (11)

1. energy-saving air-conditioning device includes control system, air-conditioner outdoor unit, indoor apparatus of air conditioner and is connected in many refrigerant pipes between described air-conditioner outdoor unit, the indoor set; Refrigerant circulates in described refrigerant pipe; Described air-conditioner outdoor unit includes compressor, off-premises station heat exchanger and throttling arrangement, and described compressor, off-premises station heat exchanger and throttling arrangement all connect by many refrigerant pipes; Described indoor apparatus of air conditioner includes the indoor set heat exchanger; It is characterized in that: described air-conditioner outdoor unit is provided with and improves degree of supercooling device (10), and described raising degree of supercooling device includes throttle mechanism (11) and heat exchange mechanisms (12); Described raising degree of supercooling device is connected with wherein refrigerant pipe of described air-conditioner outdoor unit, and the refrigerant pipe that described connection improves the degree of supercooling device is branched off into: auxiliary branch (13) and primary flow path (20); Described throttle mechanism (11) is arranged on the auxiliary branch (13), and described auxiliary branch (13) and primary flow path (20) are located to converge and carried out heat exchange in heat exchange mechanisms (12); Described auxiliary branch (13) is connected with the compressor low-pressure side.
2. a kind of energy-saving air-conditioning device according to claim 1 is characterized in that: described throttle mechanism (11) is a kind of electric expansion valve or capillary.
3. a kind of energy-saving air-conditioning device according to claim 1 and 2 is characterized in that: described heat exchange mechanisms (12) for a kind of be to adopt double pipe heat exchanger or the parallel welded type heat exchanger of a kind of copper pipe.
4. a kind of energy-saving air-conditioning device according to claim 3, it is characterized in that: described heat exchange mechanisms (12) adopts the double-tube heat exchanger structure, primary flow path (20) is passed the middle part of described heat exchange mechanisms (12), auxiliary branch (13) is communicated with sleeve pipe (121), and sleeve pipe (121) is nested in primary flow path (20) outside; The appearance of sleeve pipe (121) is incubated with the heat-preservation cotton parcel.
5. a kind of energy-saving air-conditioning device according to claim 3, it is characterized in that: described heat exchange mechanisms (12) adopts the parallel welded type heat exchanger structure of copper pipe, primary flow path (20) is two parallel copper pipes with auxiliary branch (13), and the side-walls (15) of described primary flow path (20) and auxiliary branch (13) adopts the mode of welding to be connected; The appearance of described primary flow path (20) and auxiliary branch (13) is incubated with the heat-preservation cotton parcel.
6. a kind of energy-saving air-conditioning device according to claim 3 is characterized in that: the low-pressure side of described air-conditioning pump (30) is provided with gas-liquid separator (32), and the high-pressure side of compressor (30) is provided with oil eliminator (31); Indoor set heat exchanger (100) is connected with described gas-liquid separator (32), and off-premises station heat exchanger (50) is connected with described oil eliminator (31).
7. a kind of energy-saving air-conditioning device according to claim 1 is characterized in that: connect by stop valve (91), (92) between described air-conditioner outdoor unit, the indoor apparatus of air conditioner.
8. a kind of energy-saving air-conditioning device according to claim 6 is characterized in that: the port of export of described off-premises station heat exchanger (50), connect a high pressure fluid reservoir (70), and described off-premises station heat exchanger (50) connects the inlet of high pressure fluid reservoir (70); Improving degree of supercooling device (10) is connected with the outlet of described high pressure fluid reservoir (70).
9. a kind of energy-saving air-conditioning device according to claim 7 is characterized in that: after described auxiliary branch (13) the process heat exchange mechanisms (12), connect gas-liquid separator (32); After primary flow path (20) the process heat exchange mechanisms (12), be connected with throttling arrangement (70).
10. a kind of energy-saving air-conditioning device according to claim 9, it is characterized in that: described aircondition is provided with a cross valve (40), and 4 interfaces of described cross valve (40) connect respectively: indoor set heat exchanger (100), gas-liquid separator (32), oil eliminator (31) and off-premises station heat exchanger (50).
11. a kind of energy-saving air-conditioning device according to claim 10, it is characterized in that: described aircondition is provided with check valve apparatus (60), described check valve apparatus (60) includes two groups of check valve assemblies that are connected in parallel, that is: check valve assembly one and check valve assembly two; Described check valve assembly one includes first check valve (61) and the 3rd check valve (63) of reverse setting, and described check valve assembly two includes second check valve (62) and the 4th check valve (64) of reverse setting; The inlet of high pressure fluid reservoir (70) and primary flow path (20) connect the centre position of described check valve assembly one and check valve assembly two respectively.
CN2009100366036A 2009-01-13 2009-01-13 Energy-saving air conditioner Active CN101776308B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
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CN101915450A (en) * 2010-08-16 2010-12-15 清华大学 Multi-online indoor machine wind side bypass content control method and device thereof
CN102374588A (en) * 2010-08-04 2012-03-14 三菱电机株式会社 Indoor unit of air-conditioning apparatus and air-conditioning apparatus
CN103175323A (en) * 2011-12-23 2013-06-26 东普雷股份有限公司 Refrigeration device using ternary pipe-type heat exchanger
CN103982965A (en) * 2014-05-06 2014-08-13 合肥天鹅制冷科技有限公司 Pneumatic ice storage air conditioning device for downhole rescue
CN104832993A (en) * 2015-05-13 2015-08-12 苏州奥然日用品有限公司 Energy-saving air conditioner
CN104848579A (en) * 2015-05-05 2015-08-19 广东美的制冷设备有限公司 Air conditioner and heat exchanging system thereof
WO2017148225A1 (en) * 2016-02-29 2017-09-08 珠海格力电器股份有限公司 Multi-split air conditioning device and system, cooling and heating method, and method for controlling multi-split air conditioning system
WO2019128517A1 (en) * 2017-12-29 2019-07-04 青岛海尔空调器有限总公司 Air-conditioner system

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CN2809528Y (en) * 2005-07-11 2006-08-23 海尔集团公司 Control device for overcooling degree of air conditioner refrigerant
JP4705878B2 (en) * 2006-04-27 2011-06-22 ダイキン工業株式会社 Air conditioner
CN101430149A (en) * 2007-11-08 2009-05-13 无锡同方人工环境有限公司 Bidirectional over-cooling liquid container
CN100580345C (en) * 2008-08-04 2010-01-13 广东美的电器股份有限公司 Secondary throttle recooling device of air conditioner
CN201363971Y (en) * 2009-01-13 2009-12-16 珠海格力电器股份有限公司 Energy-efficient air-conditioning device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102374588A (en) * 2010-08-04 2012-03-14 三菱电机株式会社 Indoor unit of air-conditioning apparatus and air-conditioning apparatus
CN101915450A (en) * 2010-08-16 2010-12-15 清华大学 Multi-online indoor machine wind side bypass content control method and device thereof
CN101915450B (en) * 2010-08-16 2012-10-10 清华大学 Multi-online indoor machine wind side bypass capacity control method and device thereof
CN103175323A (en) * 2011-12-23 2013-06-26 东普雷股份有限公司 Refrigeration device using ternary pipe-type heat exchanger
CN103982965A (en) * 2014-05-06 2014-08-13 合肥天鹅制冷科技有限公司 Pneumatic ice storage air conditioning device for downhole rescue
CN104848579A (en) * 2015-05-05 2015-08-19 广东美的制冷设备有限公司 Air conditioner and heat exchanging system thereof
CN104848579B (en) * 2015-05-05 2017-12-01 广东美的制冷设备有限公司 Air conditioner and its heat-exchange system
CN104832993A (en) * 2015-05-13 2015-08-12 苏州奥然日用品有限公司 Energy-saving air conditioner
WO2017148225A1 (en) * 2016-02-29 2017-09-08 珠海格力电器股份有限公司 Multi-split air conditioning device and system, cooling and heating method, and method for controlling multi-split air conditioning system
WO2019128517A1 (en) * 2017-12-29 2019-07-04 青岛海尔空调器有限总公司 Air-conditioner system

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