CN109269137B - Multi-split system and control method thereof - Google Patents
Multi-split system and control method thereof Download PDFInfo
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- CN109269137B CN109269137B CN201611208197.3A CN201611208197A CN109269137B CN 109269137 B CN109269137 B CN 109269137B CN 201611208197 A CN201611208197 A CN 201611208197A CN 109269137 B CN109269137 B CN 109269137B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a multi-split system and a control method thereof, wherein the multi-split system comprises an outdoor unit, a flow dividing device and a plurality of indoor units, the outdoor unit comprises a compressor, an outdoor heat exchanger and an air supplementing valve group, an air outlet of the compressor is respectively connected with one end of the outdoor heat exchanger and one end of the air supplementing valve group, the other end of the outdoor heat exchanger is connected with the other end of the air supplementing valve group and then connected with the flow dividing device, the air supplementing valve group comprises a plurality of air supplementing valves connected in parallel, and the method comprises the following steps: when the multi-split system is started and operated in a main refrigeration mode, acquiring the total starting capacity and the heating starting proportion of the multi-split system; and controlling the opening or closing of a plurality of parallel air supply valves in the air supply valve group according to the total starting capacity and the heating starting proportion so as to control the opening of the air supply valve group in multiple grades. Therefore, the problems that the refrigerating capacity of the large-capacity outdoor unit is poor, the system modes are frequently switched and the cold and hot are unbalanced in a small-load main refrigerating mode are effectively solved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a multi-split system and the multi-split system.
Background
At present, a multi-split system can realize refrigeration and heating at the same time, and is wide in application range and flexible to use.
When the multi-split air-conditioning system operates in a pure heating mode, high-pressure gaseous refrigerant coming out of the compressor does not pass through the outdoor heat exchanger and directly flows to the high-pressure valve from the bypass pipeline, and in order to ensure that the bypass pipeline can pass through enough refrigerant, the valve body on the bypass pipeline is generally arranged to be larger.
However, when the multi-split air conditioning system operates in the low-load main cooling mode, if the valve body is arranged at a high speed, most of the gaseous refrigerant flows to the high-pressure valve from the bypass pipe, and only a small amount of refrigerant passes through the outdoor heat exchanger, is condensed and is accumulated in the outdoor unit, so that the liquid refrigerant at the high-pressure valve is little, the liquid refrigerant is almost not present, and the cooling capacity of the cooling indoor unit is poor. This is more evident in short-piping systems.
In addition, the system can be automatically switched to the main heating mode due to poor refrigeration effect in the main refrigeration mode, but the refrigeration energy needs to be higher than the heating energy needs, and the system can be switched back to the main refrigeration mode again, so that the problems of frequent switching of the system mode and frequent switching of the heat exchanger are caused.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a method for controlling a multi-split system, which can effectively solve the problems of poor cooling capacity, frequent system mode switching, and unbalanced cooling and heating of a large capacity outdoor unit in a low load main cooling mode.
Another object of the present invention is to provide a multi-split system.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a method for controlling a multi-split system, where the multi-split system includes an outdoor unit, a flow dividing device, and a plurality of indoor units, the outdoor unit includes a compressor, an outdoor heat exchanger, and a gas supplementing valve group, an exhaust port of the compressor is respectively connected to one end of the outdoor heat exchanger and one end of the gas supplementing valve group, another end of the outdoor heat exchanger is connected to another end of the gas supplementing valve group and then connected to the flow dividing device, and the gas supplementing valve group includes a plurality of gas supplementing valves connected in parallel, where the method includes the following steps: s1, when the multi-split system is started and operated in a main cooling mode, acquiring the total starting capacity and the heating starting proportion of the multi-split system; and S2, controlling the opening or closing of a plurality of parallel air make-up valves in the air make-up valve group according to the total starting capacity and the heating starting proportion so as to control the opening of the air make-up valve group in multiple grades.
According to the control method of the multi-split system, when the multi-split system is started and operated in the main refrigeration mode, the total starting capacity and the heating starting proportion of the multi-split system are obtained, and the opening and closing of the air replenishing valves connected in parallel in the air replenishing valve group are controlled according to the total starting capacity and the heating starting proportion, so that the opening of the air replenishing valve group is subjected to multi-level control. Therefore, the problems that the refrigerating capacity of the large-capacity outdoor unit is poor, the system modes are frequently switched and the cold and hot are unbalanced in a small-load main refrigerating mode are effectively solved.
According to an embodiment of the present invention, the step S2 specifically includes: if the total starting capacity is smaller than a first preset capacity, when the heating starting proportion is smaller than a first preset proportion, carrying out first opening degree grade control on the opening degree of the air supplementing valve group, and when the heating starting proportion is larger than or equal to the first preset proportion, carrying out second opening degree grade control on the opening degree of the air supplementing valve group; if the total starting capacity is greater than or equal to the first preset capacity and smaller than a second preset capacity, when the heating starting proportion is smaller than the first preset proportion, the first opening degree grade control is carried out on the opening degree of the air supplementing valve group, and when the heating starting proportion is greater than or equal to the first preset proportion, the third opening degree grade control is carried out on the opening degree of the air supplementing valve group; if the total capacity of starting up more than or equal to the second is predetermine the capacity, then works as the ratio of starting up of heating is less than during first predetermined ratio, it is right the aperture of tonifying qi valves is gone on first aperture grade control, and works as the ratio of starting up of heating more than or equal to during first predetermined ratio, it is right the aperture of tonifying qi valves carries out fourth aperture grade control, wherein, the aperture of fourth aperture grade > the aperture of third aperture grade > the aperture of second aperture grade > the aperture of first aperture grade.
According to one embodiment of the invention, when the air make-up valve set comprises a first air make-up valve and a second air make-up valve, the first opening grade control is performed on the opening of the air make-up valve set by controlling the first air make-up valve and the second air make-up valve to be closed; controlling the opening of the air supplementing valve group to perform second opening grade control by controlling the opening of the first air supplementing valve and the closing of the second air supplementing valve; controlling the opening degree of the air supplementing valve group to carry out the third opening degree grade control by controlling the first air supplementing valve to be closed and the second air supplementing valve to be opened; and the opening degree of the air supplementing valve group is subjected to fourth degree grade control by controlling the opening and closing of the first air supplementing valve and the second air supplementing valve.
According to an embodiment of the present invention, after the step S2, the method further includes: delaying for a first preset time, acquiring the medium-pressure supercooling degree of the flow dividing device, and judging whether the medium-pressure supercooling degree is smaller than a first preset supercooling degree; if the intermediate-pressure supercooling degree is smaller than the first preset supercooling degree, reducing the opening degree of the air supplementing valve group by an opening degree grade; if the medium-pressure supercooling degree is greater than or equal to the first preset supercooling degree and smaller than the second supercooling degree, controlling the opening degree grade of the air supplementing valve group to be kept unchanged; and if the medium-pressure supercooling degree is more than or equal to the second preset supercooling degree, increasing the opening degree of the air supplementing valve group by an opening degree grade.
In order to achieve the above object, an embodiment of another aspect of the present invention provides a multi-split system, including: the outdoor unit comprises a compressor, an outdoor heat exchanger and a gas supplementing valve group, wherein an exhaust port of the compressor is respectively connected with one end of the outdoor heat exchanger and one end of the gas supplementing valve group, the other end of the outdoor heat exchanger is connected with the other end of the gas supplementing valve group and then connected with the flow dividing device, and the gas supplementing valve group comprises a plurality of gas supplementing valves connected in parallel; a flow divider; a plurality of indoor units; the control module is used for acquiring the total starting capacity and the heating starting proportion of the multi-split system when the multi-split system is started and operated in a main refrigeration mode, and controlling the opening or closing of a plurality of parallel air replenishing valves in the air replenishing valve group according to the total starting capacity and the heating starting proportion so as to perform multi-level control on the opening of the air replenishing valve group.
According to the multi-split system disclosed by the embodiment of the invention, when the multi-split system is started and operated in the main refrigeration mode, the total starting capacity and the heating starting proportion of the multi-split system are obtained through the control module, and the opening or closing of the plurality of parallel air replenishing valves in the air replenishing valve group is controlled according to the total starting capacity and the heating starting proportion, so that the opening of the air replenishing valve group is subjected to multi-level control. Therefore, the problems that the refrigerating capacity of the large-capacity outdoor unit is poor, the system modes are frequently switched and the cold and hot are unbalanced in a small-load main refrigerating mode are effectively solved.
According to an embodiment of the present invention, if the total starting-up capacity is smaller than a first preset capacity, the control module performs a first opening degree level control on the opening degree of the air make-up valve set when the heating starting-up ratio is smaller than a first preset ratio, and performs a second opening degree level control on the opening degree of the air make-up valve set when the heating starting-up ratio is greater than or equal to the first preset ratio; if the total starting capacity is greater than or equal to the first preset capacity and smaller than the second preset capacity, when the heating starting proportion is smaller than the first preset proportion, the control module performs first opening degree grade control on the opening degree of the air supplementing valve group, and when the heating starting proportion is greater than or equal to the first preset proportion, the control module performs third opening degree grade control on the opening degree of the air supplementing valve group; if start total capacity more than or equal to the second is predetermine capacity, then works as the start proportion of heating is less than during first predetermined proportion, control module is right the aperture of tonifying qi valves goes on first aperture grade control, and works as the start proportion more than or equal to of heating during first predetermined proportion, control module is right the aperture of tonifying qi valves carries out fourth aperture grade control, wherein, the aperture of fourth aperture grade > the aperture of third aperture grade > the aperture of second aperture grade > the aperture of first aperture grade.
According to an embodiment of the invention, when the air make-up valve group comprises a first air make-up valve and a second air make-up valve, the control module controls the opening degree of the air make-up valve group to be the first opening degree grade control by controlling the first air make-up valve and the second air make-up valve to be closed; the control module controls the opening of the air supplementing valve group to carry out second opening grade control by controlling the opening of the first air supplementing valve and the closing of the second air supplementing valve; the control module controls the first air supplementing valve to be closed and controls the second air supplementing valve to be opened so as to control the opening degree of the air supplementing valve group in a third opening degree grade mode; the control module controls the first air supplementing valve and the second air supplementing valve to be opened and closed so as to control the opening degree of the air supplementing valve group in a fourth degree grade mode.
According to an embodiment of the present invention, after the plurality of parallel aeration valves in the aeration valve bank are controlled to be opened or closed according to the total starting-up capacity and the heating starting-up ratio, the control module is further configured to obtain the medium-pressure supercooling degree of the flow dividing device after delaying for a first preset time, and determine whether the medium-pressure supercooling degree is smaller than a first preset supercooling degree, wherein if the medium-pressure supercooling degree is smaller than the first preset supercooling degree, the control module decreases the opening degree of the aeration valve bank by an opening degree level; if the medium-pressure supercooling degree is greater than or equal to the first preset supercooling degree and smaller than the second supercooling degree, the control module controls the opening degree grade of the air supplementing valve group to be kept unchanged; and if the medium-pressure supercooling degree is greater than or equal to the second preset supercooling degree, the control module increases the opening degree of the air supplementing valve group by an opening degree grade.
Drawings
Fig. 1 is a schematic configuration diagram of a multi-split system in the related art;
fig. 2 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control method of a multi-split system according to an embodiment of the present invention;
fig. 4 is a schematic view of a control method of a multi-split system according to another embodiment of the present invention; and
fig. 5 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control method of a multi-split system and a multi-split system proposed according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic configuration diagram of a multi-split system in the related art.
As shown in fig. 1, when the multi-split system operates in the pure heating mode, the high-pressure gaseous refrigerant flowing from the compressor 110 directly flows to the high-pressure valve from the bypass pipe without passing through the outdoor heat exchanger 120. In order to ensure that the bypass pipeline can pass through enough refrigerants and ensure that the heating indoor unit has a good heating effect, a valve body of an air compensating valve SV6 on the bypass pipeline is usually arranged to be large.
When the multi-split air-conditioning system operates in the main refrigeration mode, a part of high-pressure gaseous refrigerant coming out of the compressor 110 is condensed into liquid through the outdoor heat exchanger 120 and then flows to the high-pressure valve, and the other part of the high-pressure gaseous refrigerant flows to the high-pressure valve through the air compensating valve SV6 of the bypass pipeline, so that the liquid condensed by the outdoor heat exchanger 120 and the gas passing through the bypass pipeline can be mixed into proper refrigerant dryness, and then the mixture is conveyed to the flow dividing device through the connecting pipeline, and the refrigerant with proper dryness is separated into high-pressure liquid and high-pressure gas by the gas-liquid separator 210 in the flow dividing device and is respectively distributed to the refrigeration indoor unit and the heating.
The valve body of the air compensating valve SV6 is arranged according to the maximum refrigerant flow allowed to pass under the pure heating mode, so the valve bodies of the air compensating valve SV6 are all arranged relatively large. However, when the multi-split air-conditioning system operates in the low-load main cooling mode, if the valve body of the air compensating valve SV6 is large, most of the gaseous refrigerant is bypassed by the air compensating valve SV6, and a small amount of refrigerant is condensed after passing through the outdoor heat exchanger 120 and is accumulated in the outdoor unit, so that the outlet of the high-pressure valve is the gaseous refrigerant bypassed by the air compensating valve SV6, and the liquid refrigerant is little or no liquid refrigerant. Gaseous refrigerant increases through diverging device valve body resistance, reduces the low pressure more easily, and the high pressure also can reduce simultaneously. The refrigerant directly enters the heating indoor unit in a superheated state, the low pressure is lower, the heating indoor unit does not absorb heat, and the refrigerant circulation volume of the system is small. When the low pressure is too low, the frequency of the compressor 110 cannot be increased, and thus the refrigerant flow rate is not sufficient to ensure the cooling effect of the indoor unit. This is even more evident in short piping systems.
In addition, the system can be automatically switched to the main heating mode due to poor refrigeration effect in the main refrigeration mode, but the refrigeration energy needs to be higher than the heating energy needs, and the system can be switched back to the main refrigeration mode again, so that the problems of frequent switching of the system mode and frequent switching of the heat exchanger are caused.
For this reason, in the embodiment of the invention, the air compensating valve SV6 is provided as a plurality of parallel valve bodies, and then the cooling and heating requirements under different loads and different modes are met through controlling the valve bodies.
Fig. 2 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention. As shown in fig. 2, the multi-split system may include an outdoor unit 100, a distribution device 200, a plurality of indoor units 300, and a control module (not specifically shown).
The outdoor unit 100 may include a compressor 110, an outdoor heat exchanger 120, and a gas-supplementing valve group 130, where a gas outlet of the compressor 110 is connected to one end of the outdoor heat exchanger 120 and one end of the gas-supplementing valve group 130, respectively, the other end of the outdoor heat exchanger 120 is connected to the other end of the gas-supplementing valve group 130 and then connected to the flow dividing device 200, and the gas-supplementing valve group 130 may include a plurality of gas-supplementing valves connected in parallel.
The plurality of indoor units 300 may include a heating indoor unit 310, a cooling indoor unit 320, a heating throttle member 330, and a cooling throttle member 340. The flow splitting device 200 can include a gas-liquid separator 210, a first heat exchanger 220, a second heat exchanger 230, an intermediate pressure throttling element 240, and a subcooling circuit valve body 250. A first end of the gas-liquid separator 210 is connected to one end of the outdoor unit 100, a second end of the gas-liquid separator 210 is connected to an inlet of the first heat exchange flow path of the first heat exchanger 220, and an outlet of the first heat exchange flow path of the first heat exchanger 220 is connected to an inlet of the first heat exchange flow path of the second heat exchanger 230 through the medium-pressure throttling element 240. An outlet of the first heat exchange flow path of the second heat exchanger 230 is connected to an inlet of the second heat exchange flow path of the second heat exchanger 230 through the supercooling circuit valve body 250, an outlet of the second heat exchange flow path of the second heat exchanger 230 is connected to an inlet of the second heat exchange flow path of the first heat exchanger 220, and outlets of the second heat exchange flow path of the first heat exchanger 220 are connected to the other end of the outdoor unit 100 and one end of the cooling indoor unit 320, respectively. The other end of the refrigerating indoor unit 320 is connected to the outlet of the first heat exchange flow path of the second heat exchanger 230 through a refrigerating throttling element 340, the third end of the gas-liquid separator 210 is connected to one end of the heating indoor unit 310 through a heating throttling element 330, and the other end of the heating indoor unit 310 is connected to the inlet of the first heat exchange flow path of the second heat exchanger 230.
Wherein the first heat exchange flow path of the first heat exchanger 220, the intermediate pressure throttling element 240 and the first heat exchange flow path of the second heat exchanger 230 constitute a main path of the flow dividing device 200, and the subcooling circuit valve body 250, the second heat exchange flow path of the second heat exchanger 230 and the second heat exchange flow path of the first heat exchanger 220 constitute a subcooling circuit of the flow dividing device 200.
When the multi-split air-conditioning system is started and operated in the main refrigeration mode, the control module acquires the total starting capacity and the heating starting proportion of the multi-split air-conditioning system, and controls the opening or closing of the air supply valves connected in parallel in the air supply valve bank 130 according to the total starting capacity and the heating starting proportion so as to perform multi-level control on the opening of the air supply valve bank 130.
According to an embodiment of the present invention, if the total starting-up capacity is smaller than a first preset capacity, the control module performs a first opening degree level control on the opening degree of the air supplement valve set 130 when the heating starting-up ratio is smaller than the first preset ratio, and performs a second opening degree level control on the opening degree of the air supplement valve set 130 when the heating starting-up ratio is greater than or equal to the first preset ratio; if the total starting-up capacity is greater than or equal to the first preset capacity and smaller than the second preset capacity, when the heating starting-up proportion is smaller than the first preset proportion, the control module performs first opening degree grade control on the opening degree of the air supplementing valve group 130, and when the heating starting-up proportion is greater than or equal to the first preset proportion, the control module performs third opening degree grade control on the opening degree of the air supplementing valve group 130; if the total starting capacity is larger than or equal to the second preset capacity, the control module performs first opening degree grade control on the opening degree of the air supply valve group 130 when the heating starting proportion is smaller than the first preset proportion, and performs fourth opening degree grade control on the opening degree of the air supply valve group 130 when the heating starting proportion is larger than or equal to the first preset proportion.
The opening degree of the fourth opening degree level > the opening degree of the third opening degree level > the opening degree of the second opening degree level > the opening degree of the first opening degree level, and the first preset capacity, the second preset capacity and the first preset proportion can be calibrated according to actual conditions, for example, the first preset capacity is 30% of the total capacity, the second preset capacity is 60% of the total capacity, and the first preset proportion is 40% of the total heating starting proportion.
Further, when the air supplement valve group 130 comprises a first air supplement valve SV6 and a second air supplement valve SV9, the control module controls the first air supplement valve SV6 and the second air supplement valve SV9 to close so as to perform first opening grade control on the opening of the air supplement valve group 130; the control module controls the opening of the gas supplementing valve group 130 to perform second opening grade control by controlling the opening of the first gas supplementing valve SV6 and the closing of the second gas supplementing valve SV 9; the control module controls the closing of the first air supplement valve SV6 and the opening of the second air supplement valve SV9 to control the opening degree of the air supplement valve group 130 in a third opening degree grade mode; the control module controls the first air supplement valve SV6 and the second air supplement valve SV9 to open and close, so that the opening degree of the air supplement valve group 130 is subjected to fourth degree grade control.
Specifically, as shown in fig. 2, an air supplement valve group 130 composed of a first air supplement valve SV6 and a second air supplement valve SV9 connected in parallel is taken as an example. The sizes of the valve bodies of the first air supplement valve SV6 and the second air supplement valve SV9 can be the same or different, when the sizes of the valve bodies of the first air supplement valve SV6 and the second air supplement valve SV9 are the same, the air supplement valve group 130 can have three opening grades, and when the sizes of the valve bodies of the first air supplement valve SV6 and the second air supplement valve SV9 are different, the air supplement valve group 130 can have four opening grades.
Taking the valve body of the first air compensating valve SV6 smaller than the valve body of the second air compensating valve SV9 as an example, as shown in fig. 3, the air compensating valve bank 130 has four opening levels, and the opening of the air compensating valve bank 130 increases gradually from the first opening level to the fourth opening level. Wherein the first opening degree level corresponds to: SV6 is OFF, SV9 is OFF; the second opening degree level corresponds to: SV6 is ON, SV9 is OFF; the third openness level corresponds to: SV6 is OFF, SV9 is ON; the fourth degree level corresponds to: SV6 ═ ON, SV9 ═ ON.
When the multi-split air-conditioning system is started and operated in a main cooling mode, the on-off states of a first air supplementing valve SV6 and a second air supplementing valve SV9 are determined according to the total starting-up capacity A and the heating starting-up proportion B, so that an appropriate opening degree grade is selected for air supplementing control. For example, when a < 30% and B < 40%, the control module performs a first opening level control on the opening of the valve block 130, i.e., SV6 is OFF and SV9 is OFF; when A is less than 30% and B is more than or equal to 40%, the control module performs a second opening level control ON the opening of the air make-up valve set 130, that is, SV6 is ON and SV9 is OFF. When A is more than or equal to 30% and less than 60% and B is less than 40%, the control module performs first opening grade control on the opening of the air supplementing valve group 130, namely SV6 is OFF and SV9 is OFF; when A is more than or equal to 30% and less than 60% and B is more than or equal to 40%, the control module performs third opening grade control ON the opening of the air supply valve group 130, namely SV6 is OFF and SV9 is ON. When A is larger than or equal to 60% and B is smaller than 40%, the control module performs first opening grade control on the opening of the air supply valve group 130, namely SV6 is OFF and SV9 is OFF; when A is larger than or equal to 60% and B is larger than or equal to 40%, the control module performs fourth opening grade control ON the opening of the air supply valve group 130, namely SV6 is ON and SV9 is ON. Therefore, a proper opening degree grade is selected according to the total starting capacity and the heating starting proportion, and the opening degree of the air compensation valve body group is controlled according to the opening degree grade.
Therefore, according to the multi-split system provided by the embodiment of the invention, the heating requirement of the system in a pure heating mode can be ensured, the refrigerating and heating requirement in a small-load main refrigerating mode can be ensured, and the problems of liquid accumulation of an outdoor heat exchanger, no liquid refrigerant at an outlet of a high-pressure valve, poor refrigerating capacity, frequent switching of system modes and unbalanced cold and heat caused by overlarge valve body of an air make-up valve in the small-load main refrigerating mode are effectively avoided, so that the system is more stable.
Further, according to an embodiment of the present invention, after the plurality of parallel air make-up valves in the air make-up valve group 130 are controlled to be opened or closed according to the total startup capacity and the heating startup proportion, the control module is further configured to obtain the medium-pressure supercooling degree of the flow dividing device 200 after delaying the first preset time, and determine whether the medium-pressure supercooling degree is smaller than the first preset supercooling degree. If the intermediate-pressure supercooling degree is smaller than the first preset supercooling degree, the control module reduces the opening degree of the air supplementing valve group 130 by an opening degree grade; if the intermediate-pressure supercooling degree is greater than or equal to the first preset supercooling degree and smaller than the second supercooling degree, the control module controls the opening degree grade of the air supplementing valve group 130 to be kept unchanged; if the intermediate-pressure supercooling degree is greater than or equal to the second preset supercooling degree, the control module increases the opening degree of the air supplement valve bank 130 by an opening degree grade. The first preset time, the first preset supercooling degree and the second preset supercooling degree may be calibrated according to actual conditions, for example, the first preset time may be 10 min.
Specifically, when the multi-split air-conditioning system is started up and operated in the main cooling mode, the opening degree grade of the air-supply valve group 130 is initially judged according to the total opening capacity and the heating starting ratio, and the system is controlled to start to operate according to the judgment result. After the system operates stably, for example, after delaying for a first preset time (for example, 10min), the control module starts to determine whether the opening degree of the valve pack 130 needs to be adjusted according to the supercooling degree of the flow divider 200. For example, whether the opening degree level of the air make-up valve group 130 needs to be adjusted may be determined according to the intermediate-pressure subcooling degree SCm1 of the flow dividing device 200 (SCm1 is Tps1-Tm1, Tps1 is the saturation temperature corresponding to the pre-valve pressure Ps1 of the intermediate-pressure throttling element 240, and Tm1 is the pre-valve temperature of the intermediate-pressure throttling element 240).
If the medium-pressure supercooling degree SCm1 is smaller than the first preset supercooling degree, the result shows that the liquid refrigerant of the main flow path is less, the supercooling degree is lower, and the refrigerating effect of the refrigerating indoor unit 320 is poor, at this time, the control module reduces the opening degree of the air supply valve group 130 by one opening degree grade, so that the passing refrigerant of the air supply valve group 130 is reduced, more refrigerant enters the outdoor heat exchanger 120 to be condensed, and then enters the flow dividing device 200, so that the medium-pressure supercooling degree SCm1 of the main flow path is improved, and the refrigerating effect of the refrigerating indoor unit 320 is ensured; if the medium-pressure supercooling degree is greater than or equal to the first preset supercooling degree and smaller than the second supercooling degree, the liquid refrigerant entering the refrigerating indoor unit 320 and the gaseous refrigerant entering the heating indoor unit 310 can meet energy requirements, and the control module controls the opening degree grade of the air supplementing valve group 130 to be unchanged so as to ensure the refrigerating and heating capacities of the refrigerating indoor unit 320 and the heating indoor unit 310; if the medium-pressure supercooling degree is greater than or equal to the second preset supercooling degree, which indicates that the liquid refrigerant entering the main flow path is too much and the gaseous refrigerant is less, the control module increases the opening degree grade of the air supply valve group 130 by one opening degree grade, so that the gaseous refrigerant passing through the air supply valve group 130 is increased, and the heating capacity of the heating indoor unit 310 is ensured.
As a specific example, as shown in fig. 4, when the multi-split air-conditioning system is started up in the main cooling mode, a ratio a of total startup capacity to total startup capacity and a ratio B of heating indoor units to total startup capacity are detected, and then the total startup capacity is determined, and if a is less than 30% and B is less than 40%, the air-supply valve group 130 is controlled at a first opening level; if A is less than 30% and B is more than or equal to 40%, the air make-up valve set 130 is controlled by a second opening degree grade. If A is more than or equal to 30% and less than 60% and B is less than 40%, the air supplementing valve group 130 is controlled by a first opening degree grade; if A is more than or equal to 30% and less than 60% and B is more than or equal to 40%, the air supply valve bank 130 is controlled by a third opening degree grade. If A is more than or equal to 60% and B is less than 40%, the air supply valve group 130 is controlled by a first opening grade; and if A is more than or equal to 60% and B is more than or equal to 40%, controlling the air supply valve bank 130 at the fourth degree level.
After delaying for 10min, detecting the medium-pressure supercooling degree SCm1 of the flow dividing device 200, and if the SCm1 is smaller than the first preset supercooling degree C, reducing the opening degree of the air supplementing valve group 130 by an opening degree grade; if the SCm1 is greater than or equal to the second preset supercooling degree D, the opening degree of the gulp valve body group 130 is increased by an opening degree grade; if C is less than or equal to SCm1 and less than D, the opening degree grade of the current air make-up valve set 130 is stable and unchanged. Therefore, the problem that the high-capacity multi-split system runs in a small-load main refrigeration mode and the refrigeration capacity is poor can be effectively solved. Resulting in frequent switching and unbalanced cooling and heating.
In summary, according to the multi-split system in the embodiment of the invention, when the multi-split system is started and operated in the main cooling mode, the control module obtains the total starting capacity and the heating starting ratio of the multi-split system, and controls the opening or closing of the plurality of parallel air make-up valves in the air make-up valve group according to the total starting capacity and the heating starting ratio, so as to perform multi-level control on the opening of the air make-up valve group. Therefore, the problems that the high-capacity outdoor unit is poor in refrigerating capacity, frequent in system mode switching and unbalanced in cold and hot states in a low-load main refrigerating mode are effectively solved.
Fig. 5 is a flowchart of a control method of a multi-split system according to an embodiment of the present invention.
In an embodiment of the present invention, the multi-split system may include an outdoor unit, a flow distribution device, and a plurality of indoor units, the outdoor unit may include a compressor, an outdoor heat exchanger, and a gas supplementing valve group, an exhaust port of the compressor is connected to one end of the outdoor heat exchanger and one end of the gas supplementing valve group, respectively, the other end of the outdoor heat exchanger and the other end of the gas supplementing valve group are connected to the flow distribution device, and the gas supplementing valve group may include a plurality of gas supplementing valves connected in parallel.
As shown in fig. 5, the control method of the multi-split system may include the steps of:
and S1, when the multi-split air conditioner system is started to operate in the main cooling mode, acquiring the total starting capacity and the heating starting proportion of the multi-split air conditioner system.
And S2, controlling the opening or closing of a plurality of parallel air make-up valves in the air make-up valve group according to the total starting capacity and the heating starting proportion so as to control the opening of the air make-up valve group in a multi-level manner.
According to an embodiment of the present invention, step S2 may specifically include: if the total starting capacity is smaller than the first preset capacity, when the heating starting proportion is smaller than the first preset proportion, carrying out first opening degree grade control on the opening degree of the air supplementing valve group, and when the heating starting proportion is larger than or equal to the first preset proportion, carrying out second opening degree grade control on the opening degree of the air supplementing valve group; if the total starting capacity is greater than or equal to a first preset capacity and smaller than a second preset capacity, when the heating starting proportion is smaller than the first preset proportion, carrying out first opening degree grade control on the opening degree of the air supplementing valve group, and when the heating starting proportion is greater than or equal to the first preset proportion, carrying out third opening degree grade control on the opening degree of the air supplementing valve group; if the total starting capacity is larger than or equal to the second preset capacity, when the heating starting proportion is smaller than the first preset proportion, the opening degree of the air supplementing valve group is subjected to first opening degree grade control, and when the heating starting proportion is larger than or equal to the first preset proportion, the opening degree of the air supplementing valve group is subjected to fourth opening degree grade control, wherein the opening degree of the fourth opening degree grade is larger than the opening degree of the third opening degree grade and larger than the opening degree of the second opening degree grade and larger than the opening degree of the first opening degree grade.
According to an embodiment of the present invention, when the air make-up valve set may include a first air make-up valve and a second air make-up valve, wherein the first air make-up valve and the second air make-up valve are both controlled to be closed, so as to perform a first opening degree grade control on the opening degree of the air make-up valve set; the opening degree of the air supplementing valve group is subjected to second opening degree grade control by controlling the opening degree of the first air supplementing valve and the closing degree of the second air supplementing valve; controlling the opening degree of the air supplementing valve group to carry out third opening degree grade control by controlling the closing of the first air supplementing valve and the opening of the second air supplementing valve; and the opening degree of the air supplementing valve group is subjected to fourth degree grade control by controlling the opening and closing of the first air supplementing valve and the second air supplementing valve.
According to an embodiment of the present invention, after step S2, the method further includes: delaying the first preset time, obtaining the medium-pressure supercooling degree of the flow dividing device, and judging whether the medium-pressure supercooling degree is smaller than the first preset supercooling degree; if the intermediate-pressure supercooling degree is smaller than the first preset supercooling degree, reducing the opening degree of the air supplementing valve group by an opening degree grade; if the intermediate-pressure supercooling degree is greater than or equal to a first preset supercooling degree and smaller than a second supercooling degree, controlling the opening degree grade of the gas supplementing valve group to be unchanged; and if the intermediate-pressure supercooling degree is greater than or equal to a second preset supercooling degree, increasing the opening degree of the air supplementing valve group by an opening degree grade.
It should be noted that details that are not disclosed in the method for controlling a multi-split air-conditioning system according to the embodiment of the present invention refer to details that are disclosed in the multi-split air-conditioning system according to the embodiment of the present invention, and are not described herein again in detail.
According to the control method of the multi-split system, when the multi-split system is started and operated in the main refrigeration mode, the total starting capacity and the heating starting proportion of the multi-split system are obtained, and the opening and closing of the air replenishing valves connected in parallel in the air replenishing valve group are controlled according to the total starting capacity and the heating starting proportion, so that the opening of the air replenishing valve group is controlled in a multi-level mode. Therefore, the problems that the high-capacity multi-connected outdoor unit has poor refrigerating capacity in a small-load main refrigerating mode, so that modes are frequently switched and cold and hot are unbalanced are effectively solved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The control method of the multi-split air conditioning system is characterized in that the multi-split air conditioning system comprises an outdoor unit, a flow dividing device and a plurality of indoor units, the outdoor unit comprises a compressor, an outdoor heat exchanger and an air supplementing valve group, an air outlet of the compressor is respectively connected with one end of the outdoor heat exchanger and one end of the air supplementing valve group, the other end of the outdoor heat exchanger is connected with the other end of the air supplementing valve group and then connected with the flow dividing device, the air supplementing valve group comprises a plurality of air supplementing valves connected in parallel, and the method comprises the following steps:
s1, when the multi-split system is started and operated in a main cooling mode, acquiring the total starting capacity and the heating starting proportion of the multi-split system;
s2, controlling opening or closing of a plurality of parallel air make-up valves in the air make-up valve group according to the total starting capacity and the heating starting ratio, so as to perform multi-level control on the opening of the air make-up valve group, wherein the step S2 includes:
if the total starting capacity is smaller than a first preset capacity, when the heating starting proportion is smaller than a first preset proportion, first opening degree grade control is carried out on the opening degree of the air supplementing valve group, and when the heating starting proportion is larger than or equal to the first preset proportion, second opening degree grade control is carried out on the opening degree of the air supplementing valve group, wherein the opening degree of the second opening degree grade is larger than the opening degree of the first opening degree grade.
2. The method of controlling a multi-split system as set forth in claim 1, wherein the step S2 further includes:
if the total starting capacity is greater than or equal to the first preset capacity and smaller than a second preset capacity, when the heating starting proportion is smaller than the first preset proportion, the first opening degree grade control is carried out on the opening degree of the air supplementing valve group, and when the heating starting proportion is greater than or equal to the first preset proportion, the third opening degree grade control is carried out on the opening degree of the air supplementing valve group;
if the total capacity of starting up more than or equal to the second is predetermine the capacity, then works as the ratio of starting up of heating is less than during first predetermined ratio, it is right the aperture of tonifying qi valves is gone on first aperture grade control, and works as the ratio of starting up of heating more than or equal to during first predetermined ratio, it is right the aperture of tonifying qi valves carries out fourth aperture grade control, wherein, the aperture of fourth aperture grade > the aperture of third aperture grade > the aperture of second aperture grade.
3. The method for controlling a multi-split system as claimed in claim 2, wherein, when the valve block includes a first gulp valve and a second gulp valve, wherein,
controlling the first air supplement valve and the second air supplement valve to be closed so as to control the opening degree of the air supplement valve group in a first opening degree grade mode;
controlling the opening of the air supplementing valve group to perform second opening grade control by controlling the opening of the first air supplementing valve and the closing of the second air supplementing valve;
controlling the opening degree of the air supplementing valve group to carry out the third opening degree grade control by controlling the first air supplementing valve to be closed and the second air supplementing valve to be opened;
and controlling the opening degree of the air supplementing valve group to carry out the fourth degree grade control by controlling the first air supplementing valve and the second air supplementing valve to be opened.
4. The method of controlling a multi-split system as set forth in any one of claims 1 to 3, further comprising, after the step S2:
delaying for a first preset time, acquiring the medium-pressure supercooling degree of the flow dividing device, and judging whether the medium-pressure supercooling degree is smaller than a first preset supercooling degree;
if the intermediate-pressure supercooling degree is smaller than the first preset supercooling degree, reducing the opening degree of the air supplementing valve group by an opening degree grade;
if the medium-pressure supercooling degree is greater than or equal to the first preset supercooling degree and smaller than the second preset supercooling degree, controlling the opening degree grade of the air supplementing valve group to be kept unchanged;
and if the medium-pressure supercooling degree is more than or equal to the second preset supercooling degree, increasing the opening degree of the air supplementing valve group by an opening degree grade.
5. A multiple on-line system, comprising:
a flow divider;
the outdoor unit comprises a compressor, an outdoor heat exchanger and a gas supplementing valve group, wherein an exhaust port of the compressor is respectively connected with one end of the outdoor heat exchanger and one end of the gas supplementing valve group, the other end of the outdoor heat exchanger is connected with the other end of the gas supplementing valve group and then connected with the flow dividing device, and the gas supplementing valve group comprises a plurality of gas supplementing valves connected in parallel;
a plurality of indoor units;
the control module is used for acquiring the total starting capacity and the heating starting proportion of the multi-split system when the multi-split system is started and operated in a main cooling mode, and a plurality of parallel air compensating valves in the air compensating valve group are controlled to be opened or closed according to the total starting capacity and the heating starting proportion so as to control the opening degree of the air compensating valve group in multiple grades, wherein, if the total starting capacity is smaller than a first preset capacity, the control module performs first opening degree grade control on the opening degree of the air supplementing valve group when the heating starting proportion is smaller than a first preset proportion, and when the heating starting-up proportion is larger than or equal to the first preset proportion, the control module performs second opening degree grade control on the opening degree of the air supplementing valve group, wherein the opening degree of the second opening degree grade is larger than the opening degree of the first opening degree grade.
6. The multi-split system as claimed in claim 5, wherein if the total power-on capacity is greater than or equal to the first preset capacity and less than a second preset capacity, the control module performs the first opening degree level control on the opening degree of the air supplement valve group when the heating power-on ratio is less than the first preset ratio, and performs the third opening degree level control on the opening degree of the air supplement valve group when the heating power-on ratio is greater than or equal to the first preset ratio;
if start total capacity more than or equal to the second is predetermine capacity, then works as the ratio of making a start is less than during the first ratio of predetermineeing, control module is right the aperture of tonifying qi valves is gone on first aperture grade control, and works as the ratio more than or equal to of making a start heats during the first ratio of predetermineeing, control module is right the aperture of tonifying qi valves carries out fourth aperture grade control, wherein, the aperture of fourth aperture grade > the aperture of third aperture grade > the aperture of second aperture grade.
7. The multi-split system as claimed in claim 6, wherein, when the air supplement valve block includes a first air supplement valve and a second air supplement valve, wherein,
the control module controls the first air supplement valve and the second air supplement valve to be closed so as to control the opening degree of the air supplement valve group in a first opening degree grade mode;
the control module controls the opening of the air supplementing valve group to carry out second opening grade control by controlling the opening of the first air supplementing valve and the closing of the second air supplementing valve;
the control module controls the first air supplementing valve to be closed and controls the second air supplementing valve to be opened so as to control the opening degree of the air supplementing valve group in a third opening degree grade mode;
and the control module controls the first air supplementing valve and the second air supplementing valve to be opened so as to control the opening degree of the air supplementing valve group in a fourth degree grade mode.
8. The multi-split system as claimed in any one of claims 5 to 7, wherein after controlling the opening or closing of the plurality of parallel gulp valves in the gulp valve bank according to the total startup capacity and the heating startup proportion, the control module is further configured to obtain the medium-pressure supercooling degree of the splitting device after delaying a first preset time, and determine whether the medium-pressure supercooling degree is less than a first preset supercooling degree, wherein,
if the intermediate-pressure supercooling degree is smaller than the first preset supercooling degree, the control module reduces the opening degree of the gas supplementing valve group by an opening degree grade;
if the medium-pressure supercooling degree is greater than or equal to the first preset supercooling degree and smaller than the second preset supercooling degree, the control module controls the opening degree grade of the air supplementing valve group to be kept unchanged;
and if the medium-pressure supercooling degree is greater than or equal to the second preset supercooling degree, the control module increases the opening degree of the air supplementing valve group by an opening degree grade.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821663A (en) * | 2005-02-15 | 2006-08-23 | Lg电子株式会社 | Multi type air-conditioner and control method thereof |
| KR20080009848A (en) * | 2006-07-25 | 2008-01-30 | 엘지전자 주식회사 | Multi-type air conditioner for cooling/heating the same time |
| KR20090114834A (en) * | 2008-04-30 | 2009-11-04 | 엘지전자 주식회사 | Multi-type air-conditioner and the control method |
| CN104748262A (en) * | 2015-03-31 | 2015-07-01 | 广东美的暖通设备有限公司 | Multi-split system |
| CN105928064A (en) * | 2016-04-29 | 2016-09-07 | 广东美的暖通设备有限公司 | VRV system and valve control method for supercooling loop of VRV system |
| CN105987537A (en) * | 2015-02-05 | 2016-10-05 | 佛山市禾才科技服务有限公司 | Multi-connected air conditioning system and variable load control method thereof |
-
2016
- 2016-12-23 CN CN201611208197.3A patent/CN109269137B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821663A (en) * | 2005-02-15 | 2006-08-23 | Lg电子株式会社 | Multi type air-conditioner and control method thereof |
| KR20080009848A (en) * | 2006-07-25 | 2008-01-30 | 엘지전자 주식회사 | Multi-type air conditioner for cooling/heating the same time |
| KR20090114834A (en) * | 2008-04-30 | 2009-11-04 | 엘지전자 주식회사 | Multi-type air-conditioner and the control method |
| CN105987537A (en) * | 2015-02-05 | 2016-10-05 | 佛山市禾才科技服务有限公司 | Multi-connected air conditioning system and variable load control method thereof |
| CN104748262A (en) * | 2015-03-31 | 2015-07-01 | 广东美的暖通设备有限公司 | Multi-split system |
| CN105928064A (en) * | 2016-04-29 | 2016-09-07 | 广东美的暖通设备有限公司 | VRV system and valve control method for supercooling loop of VRV system |
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