CN108151350B - Three-control multi-split system and control method thereof - Google Patents

Three-control multi-split system and control method thereof Download PDF

Info

Publication number
CN108151350B
CN108151350B CN201711384317.XA CN201711384317A CN108151350B CN 108151350 B CN108151350 B CN 108151350B CN 201711384317 A CN201711384317 A CN 201711384317A CN 108151350 B CN108151350 B CN 108151350B
Authority
CN
China
Prior art keywords
switching
port
heat exchanger
switching port
split
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201711384317.XA
Other languages
Chinese (zh)
Other versions
CN108151350A (en
Inventor
王命仁
杨坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GD Midea Heating and Ventilating Equipment Co Ltd
Hefei Midea Heating and Ventilating Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Midea Group Co Ltd, GD Midea Heating and Ventilating Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201711384317.XA priority Critical patent/CN108151350B/en
Publication of CN108151350A publication Critical patent/CN108151350A/en
Application granted granted Critical
Publication of CN108151350B publication Critical patent/CN108151350B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • F25B2347/021—Alternate defrosting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a three-control multi-split system and a control method, wherein the three-control multi-split system comprises: the refrigerant distribution device comprises a compressor assembly, a plurality of first heat exchanger assemblies arranged in parallel, a plurality of second heat exchanger assemblies arranged in parallel, a refrigerant distribution device, a flow regulating device and a second switching device, wherein the flow regulating device is connected between a second end of one of the first heat exchangers and the corresponding first throttling device; the second switching device comprises a first switching port and a third switching port, the first switching port is connected with an air suction port of the compressor assembly, the third switching port is connected between the flow regulating device and the corresponding first throttling device, the second switching port is switched and communicated with any one of the first switching port and the third switching port, and the second end of each second heat exchanger is switchably communicated with the second switching port and an air exhaust port of the compressor assembly through a distribution switching part of the corresponding refrigerant distribution device. The three-pipe multi-split system has high reliability.

Description

Three-control multi-split system and control method thereof
Technical Field
The invention relates to the technical field of refrigeration, in particular to a three-pipe multi-split air conditioner system and a control method thereof.
Background
In the traditional heat pump multi-split air conditioner system, when the indoor side generates a refrigeration demand, the heat pump multi-split air conditioner system transfers the heat load of the indoor side to an outer machine of the heat pump multi-split air conditioner system through a refrigerant, and releases heat through condensation of a heat exchanger in the outer machine; when the indoor side generates the heating demand, the heat pump multi-split air conditioner system switches the heat exchanger in the outdoor unit into the evaporator to absorb heat to the surrounding environment, and transfers the heat absorbed by the outdoor unit to the indoor side through the refrigerant to meet the heating demand of the indoor side. However, in a building air conditioning system using a multi-split air conditioning unit, there are often both cooling and heating loads. For example, in the spring and autumn transition season, the rooms in the outer part of the building may have heating requirements, while the rooms in the interior of the building are easily sultry due to heat accumulation, thereby generating cooling requirements. At the moment, the heat pump multi-split system cannot control the heat exchangers in the outer machine to absorb and release heat simultaneously. And the heat exchanger of the outer machine of the three-pipe multi-split system can absorb and release heat simultaneously, and meanwhile, the heat of the inner machine side of the heat pump multi-split system is recovered, so that the requirements of refrigerating and heating simultaneously are met.
Although the three-pipe multi-split air conditioner system can simultaneously refrigerate and heat, when a part of heat exchangers of the outer unit are used as evaporators, if the outdoor environment temperature is lower than a certain temperature (for example, lower than 5 ℃), the evaporation temperature of the inner unit is lowered due to too low evaporation temperature of the heat exchangers of the outer unit, so that a coil pipe and fins in the refrigerated inner unit are frosted, the inner unit is enabled to frequently enter anti-freezing protection, the comfort of the refrigerated inner unit is affected, and meanwhile, condensed water is blown and the pipelines of the inner unit are damaged by freezing.
In the related art, the throttling valve of the refrigeration inner machine is mainly closed to deal with the problem, however, the outlet air temperature of the refrigeration inner machine is low, and the frosting of the coil pipe and the fins in the inner machine cannot be avoided.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a three-control multi-split system which is high in reliability.
The invention also provides a control method of the three-control multi-split system.
The three-control multi-split system according to the embodiment of the first aspect of the present invention includes: the outdoor unit comprises a compressor assembly and a plurality of first heat exchanger assemblies arranged in parallel, the compressor assembly comprises an air suction port and an air exhaust port, each first heat exchanger assembly comprises a first switching device, a first heat exchanger and a first throttling device, the first switching device comprises a first interface to a third interface, the first interface is connected with the air exhaust port, the second interface is connected with the first end of the first heat exchanger, the third interface is connected with the air suction port, the second interface is suitable for being switched and conducted with any one of the first interface and the third interface, and the first throttling device is connected with the second end of the first heat exchanger; the indoor unit comprises a plurality of second heat exchanger assemblies arranged in parallel, the plurality of second heat exchanger assemblies are connected with the plurality of first heat exchanger assemblies in series, each second heat exchanger assembly comprises a second throttling device and a second heat exchanger, one end of each second throttling device is connected with the plurality of first throttling devices, and the other end of each second throttling device is connected with the first end of each second heat exchanger; the refrigerant distribution device comprises a plurality of distribution switching parts, and the distribution switching parts are correspondingly connected with the second ends of the second heat exchangers one by one; the flow regulating device is connected between the second end of one of the first heat exchangers and the corresponding first throttling device, and is suitable for regulating the flow of the refrigerant flowing through the flow regulating device; and the second switching device comprises a first switching port to a third switching port, the first switching port is connected with the air suction port, the third switching port is connected between the flow regulating device and the corresponding first throttling device, the second switching port is suitable for being switched and communicated with any one of the first switching port and the third switching port, and the second end of each second heat exchanger is switchably communicated with any one of the second switching port and the air exhaust port through the corresponding distribution switching part.
According to the three-pipe multi-split system disclosed by the embodiment of the invention, the refrigeration requirement on the indoor side under the low-temperature working condition can be effectively met, meanwhile, the second heat exchanger is prevented from being frozen, and the reliability and the comfort of the operation of the three-pipe multi-split system are ensured.
According to some embodiments of the present invention, when the three-pipe multi-split air conditioning system is mainly in heating operation and the evaporating temperature of the internal machine for cooling needs to be adjusted, the second end of the second heat exchanger is switched to be conducted with the second switching port and the second switching port is conducted with the third switching port through the corresponding distribution switching component.
According to some embodiments of the invention, the flow regulating device is a throttle valve.
According to some embodiments of the invention, the flow regulating device is a plurality of solenoid valves connected in parallel.
According to some embodiments of the invention, the second switching device is a three-way valve.
According to some embodiments of the invention, the second switching device is a four-way valve, and the second switching device further comprises a fourth switching port connected to the suction port through a capillary tube.
According to some embodiments of the invention, the second end of each of the second heat exchangers is connected to the second switching port through a first flow path and to the exhaust port through a second flow path, and the distribution switching part includes a first switch provided on the first flow path and a second switch provided on the second flow path.
According to a second aspect of the present invention, a control method for a three-control multi-split air-conditioning system is provided, where the three-control multi-split air-conditioning system is the three-control multi-split air-conditioning system according to the first aspect of the present invention, and the control method includes the following steps: when the three-pipe multi-split air-conditioning system meets at least one of a condition A, a condition B and a condition C, controlling the second switching port to be communicated with the first switching port and keeping the flow regulating device in a fully-opened state; otherwise, controlling the second switching port and the third switching port to be communicated and adjusting the flow of the refrigerant flowing through the flow adjusting device; the condition A is the non-main heating operation of the three-control multi-split system; the condition B is the outdoor environment temperature T1Satisfies the following conditions: t is1A is greater than a; the condition C is the evaporation temperature T of the inner machine for refrigeration2Satisfies the following conditions: t is2B and t1The inner machine for refrigeration does not perform the anti-freezing protection action within the time.
According to some embodiments of the invention, the determination period is Ta。
According to some embodiments of the invention, the initial opening of the flow regulating device is K, when T is2Satisfies the following conditions: t is2B is ≦ b for the time t1Or for refrigerationWhen the inner machine executes the anti-freezing protection action, the opening degree of the flow regulating device is continuously reduced; when said T is2Satisfies the following conditions: t is2B, when the inner machine for refrigeration does not execute the anti-freezing protection action, keeping the current opening of the flow regulating device to continue running; when said T is2Satisfies the following conditions: t is2C and at t2When the inner machine for refrigeration does not execute the anti-freezing protection action within the time, the opening degree of the flow regulating device is increased; wherein c > b.
According to some embodiments of the invention, the control period of the opening of the flow regulating device is Tb。
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments taken in conjunction with the accompanying drawings of which:
fig. 1 is a partial schematic view of a three-pipe multi-split system according to an embodiment of the present invention;
FIG. 2 is a partial schematic view of a three-pipe multi-split air conditioning system according to an embodiment of the invention during pure cooling operation;
FIG. 3 is a partial schematic view of a three-pipe multi-split air conditioning system during main cooling operation according to an embodiment of the invention;
FIG. 4 is a partial schematic diagram of a tri-pipe multi-split air-conditioning system during pure heating operation according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a three pipe multiple on line system during main heating operation with the refrigeration second heat exchanger evaporative thermostat deactivated in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of a three-pipe multi-split air conditioning system during main heating operation with the refrigeration second heat exchanger evaporating temperature adjusting device in effect, according to an embodiment of the invention;
FIG. 7 is a control flow diagram of a control method of a tri-regulation multi-split air-conditioning system according to an embodiment of the present invention;
fig. 8 is a control flow chart of the opening degree of the flow regulating device of the three-pipe multi-split system according to the embodiment of the invention.
Reference numerals:
100: a three-control multi-split system;
1: an outdoor unit; 11: a compressor; 111: an exhaust port;
12: a low pressure tank; 121: an air suction port;
13: a first switching device; 131: a first interface; 132: a second interface; 133: a third interface;
14: a first heat exchanger; 15: a first throttling device;
2: an internal machine; 21: a second throttling device; 22: a second heat exchanger;
3: a refrigerant distribution device; 31: a first switch; 32: a second switch;
4: a flow regulating device;
5: a second switching device; 51: a first switching port; 52: a second switching port;
53: a third switching port; 54: a fourth switching port;
61: a first flow path; 62: a second flow path.
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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A three-pipe multi-split system 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 8.
As shown in fig. 1 to 8, a three-pipe multi-split air-conditioning system 100 according to an embodiment of the first aspect of the present invention includes an outdoor unit 1, an indoor unit 2, a refrigerant distribution device 3, a flow rate adjustment device 4, and a second switching device 5.
Specifically, the outer unit 1 includes a compressor unit including a suction port 121 and a discharge port 111, and a plurality of first heat exchanger 14 units disposed in parallel. For example, referring to fig. 1 to 6, the compressor assembly includes a compressor 11 and a low pressure tank 12, the low pressure tank 12 is connected to a suction port 121 of the compressor 11, when the suction port 121 is provided on the low pressure tank 12, and a discharge port 111 is provided on the compressor 11.
Each first heat exchanger 14 assembly comprises a first switching device 13, a first heat exchanger 14 and a first throttling device 15, the first switching device 13 comprises a first interface 131, a second interface 132 and a third interface 133, the first interface 131 of the first switching device 13 is connected with the exhaust port 111 of the compressor assembly, the second interface 132 of the first switching device 13 is connected with a first end (e.g. the left end in fig. 1-6) of the first heat exchanger 14, the third interface 133 of the first switching device 13 is connected with the suction port 121 of the compressor assembly, the first interface 131 of the first switching device 13 is adapted to be switched into conduction with any one of the second interface 132 and the third interface 133, and the first throttling device 15 is connected with a second end (e.g. the right end in fig. 1-6) of the first heat exchanger 14. Alternatively, the first throttling device 15 is an electronic expansion valve or a capillary tube, etc.
The inner machine 2 includes a plurality of second heat exchanger 22 assemblies arranged in parallel, the plurality of second heat exchanger 22 assemblies being connected in series with the plurality of first heat exchanger 14 assemblies, each of the second heat exchanger 22 assemblies including a second throttle device 21 and a second heat exchanger 22, one end (e.g., the left end in fig. 5-6) of the plurality of second throttle devices 21 being connected to the plurality of first throttle devices 15, and the other end (e.g., the right end in fig. 5-6) of the plurality of second throttle devices 21 being connected to the first end (e.g., the left end in fig. 5-6) of the plurality of second heat exchangers 22. Alternatively, the second throttling device 21 is an electronic expansion valve or a capillary tube or the like.
The refrigerant distribution device 3 includes a plurality of distribution switching members, and the plurality of distribution switching members are connected to second ends (e.g., right ends in fig. 5 to 6) of the plurality of second heat exchangers 22 in a one-to-one correspondence. The number of distribution switching means is now the same as the number of second heat exchangers 22.
The flow rate adjusting device 4 is connected between the second end of one of the first heat exchangers 14 and the corresponding first throttling device 15, and the flow rate adjusting device 4 is adapted to adjust the flow rate of the refrigerant flowing therethrough.
The second switching device 5 comprises a first switching port 51, a second switching port 52 and a third switching port 53, the first switching port 51 of the second switching device 5 is connected with the suction port 121 of the compressor assembly, the third switching port 53 of the second switching device 5 is connected between the flow regulating device 4 and the corresponding first throttling device 15, the second switching port 52 of the second switching device 5 is adapted to be in switching communication with any one of the first switching port 51 and the third switching port 53, and the second end of each second heat exchanger 22 is in switching communication with any one of the second switching port 52 of the second switching device 5 and the discharge port 111 of the compressor assembly through a corresponding distribution switching member. The second switching device 5 and the flow rate adjusting device 4 together form an evaporation temperature adjusting device of the refrigeration inner machine 2.
When the three-pipe multi-split air-conditioning system 100 is in pure cooling operation, all the indoor units 2 generate cooling demands, and the evaporation temperature adjusting devices of the indoor units 2 do not work, that is, the flow adjusting device 4 is kept in a fully open state, and the second switching port 52 of the second switching device 5 is switched to be communicated with the first switching port 51. The flow direction of the refrigerant is completely the same as that of the conventional three-pipe multi-split air-conditioning system 100. Specifically, the second port 132 of the first switching device 13 is communicated with the first port 131, and the second end of each second heat exchanger 22 is switched to be communicated with the second switching port 52 of the second switching device 5 through the corresponding distribution switching component. The high-temperature and high-pressure refrigerant discharged from the compressor 11 is cooled to a low-temperature and high-pressure refrigerant in the first heat exchanger 14 of the outer unit 1, and then sent to the second heat exchanger 22 of the inner unit 2 for evaporation, and the formed low-pressure gaseous refrigerant returns to the suction port 121 of the compressor assembly through the second switching device 5, as shown by the arrow in fig. 2.
When the three-pipe multi-split air-conditioning system 100 is in main cooling operation, the multiple internal machines 2 mainly generate cooling demands, and the evaporation temperature adjusting devices of the cooling internal machines 2 are inactive, that is, the flow adjusting device 4 is kept in a fully open state and the second switching port 52 of the second switching device 5 is switched to be communicated with the first switching port 51. The flow direction of the refrigerant is completely the same as that of the conventional three-pipe multi-split air-conditioning system 100. Specifically, the second port 132 of the first switching device 13 is in communication with the first port 131, the second end of the second heat exchanger 22 for cooling is switched to be in communication with the second switching port 52 of the second switching device 5 by the corresponding distribution switching member, and the second end of the second heat exchanger 22 for heating is switched to be in communication with the discharge port 111 of the compressor 11 by the corresponding distribution switching member. A part of the high-temperature and high-pressure refrigerant discharged from the compressor 11 flows to the first heat exchanger 14 of the outdoor unit 1, is cooled into a low-temperature and high-pressure refrigerant, and a part of the low-temperature and high-pressure refrigerant is sent to the indoor unit 2 for heating through the distribution switching unit, then is mixed with the low-temperature and high-pressure liquid refrigerant of the first heat exchanger 14, flows into the indoor unit 2 for cooling, is evaporated, and the formed low-pressure gaseous refrigerant returns to the suction port 121 of the compressor assembly through the second switching device 5, as shown by an arrow in fig. 3.
When the three-pipe multi-split air-conditioning system 100 is running purely for heating, all the indoor units 2 generate heating requirements at this time, and the evaporation temperature adjusting devices of the refrigeration indoor units 2 do not work, that is, the flow adjusting device 4 is kept in a fully open state and the second switching port 52 of the second switching device 5 is switched to be communicated with the first switching port 51. The flow direction of the refrigerant is completely the same as that of the conventional three-pipe multi-split air-conditioning system 100. Specifically, the second port 132 of the first switching device 13 is communicated with the third port 133, and the second end of each second heat exchanger 22 is switched to be communicated with the exhaust port 111 of the compressor 11 through the corresponding distribution switching component. The high-temperature and high-pressure refrigerant discharged from the compressor 11 is sent to the internal machine 2 for heating to be condensed, and the generated low-temperature and high-pressure liquid refrigerant is throttled by the first throttling device 15, evaporated into a low-pressure gaseous refrigerant in the first heat exchanger 14 of the external machine 1, and returned to the air suction port 121 of the compressor assembly, as shown by the arrow in fig. 4.
When the three-pipe multi-split air-conditioning system 100 mainly performs heating operation, the multiple indoor units 2 mainly generate heating requirements, and if the evaporation temperature of the indoor unit 2 for cooling does not need to be adjusted, the evaporation temperature adjusting device of the indoor unit 2 for cooling does not work, that is, the flow adjusting device 4 is kept in a fully open state, and the second switching port 52 of the second switching device 5 is switched to be communicated with the first switching port 51. The flow direction of the refrigerant is completely the same as that of the conventional three-pipe multi-split air-conditioning system 100. Specifically, the second port 132 of the first switching device 13 is in communication with the third port 133, the second end of the second heat exchanger 22 for heating is switched to be in communication with the discharge port 111 of the compressor 11 by the corresponding distribution switching member, and the second end of the second heat exchanger 22 for cooling is switched to be in communication with the second switching port 52 of the second switching device 5 by the corresponding distribution switching member. The high-temperature high-pressure refrigerant discharged from the compressor 11 is sent to the inner machine 2 for heating to be condensed, a part of the generated low-temperature high-pressure liquid refrigerant is sent to the inner machine 2 for refrigeration to be evaporated, a part of the low-temperature high-pressure liquid refrigerant is throttled by the first throttling device 15 and evaporated into low-pressure gaseous refrigerant in the first heat exchanger 14 of the outer machine 1, and the low-pressure gaseous refrigerant is converged with the low-pressure gaseous refrigerant returned after being evaporated from the inner machine 2 for refrigeration and then returns to the air suction port 121 of the compressor assembly, as shown by an arrow in fig. 5.
When the three-pipe multi-split air-conditioning system 100 mainly performs heating operation, the multiple internal machines 2 mainly generate heating requirements, and if the evaporation temperature of the internal machines 2 for cooling needs to be adjusted, the second switching port 52 of the second switching device 5 is switched to be communicated with the third switching port 53, and the opening degree of the flow regulating device 4 can be adjusted according to the needs of the three-pipe multi-split air-conditioning system 100, so that an intermediate pressure state is generated between the first throttling device 15 and the flow regulating device 4. Specifically, the second port 132 of the first switching device 13 is in communication with the third port 133, the second end of the second heat exchanger 22 for heating is switched to be in communication with the discharge port 111 of the compressor 11 by the corresponding distribution switching member, and the second end of the second heat exchanger 22 for cooling is switched to be in communication with the second switching port 52 of the second switching device 5 by the corresponding distribution switching member. High-temperature and high-pressure refrigerant discharged from the compressor 11 is sent to the inner machine 2 for heating to be condensed, part of the generated low-temperature and high-pressure liquid refrigerant returns to the outer machine 1, and is evaporated into low-pressure gaseous refrigerant in a first heat exchanger 14 of the outer machine 1 after being throttled by the first throttling device 15 and the flow regulating device 4; a part of the refrigerant is sent to the indoor unit 2 for refrigeration to be evaporated, the generated medium-pressure refrigerant returns to the outdoor unit 1 through the distribution switching part, and is merged with the refrigerant after being throttled once by the first throttling device 15, and is throttled twice by the flow adjusting device 4 to be a low-pressure two-phase refrigerant, and the refrigerant returns to the air suction port 121 of the compressor assembly after being evaporated in the first heat exchanger 14 of the outdoor unit 1, as shown by an arrow in fig. 6.
Therefore, when the outdoor environment temperature is low, in the refrigerating and heating mixed operation mode of the three-pipe multi-split air-conditioning system 100, the intermediate pressure state can be manufactured through the outlet of the indoor unit 2 for refrigerating, so that the evaporation temperature of the indoor unit 2 for refrigerating is adjusted, the phenomenon that the coil pipe and the fin of the indoor unit 2 for refrigerating are frozen is avoided, and the comfort level and the reliability of the three-pipe multi-split air-conditioning system 100 are improved.
Here, it should be noted that "main cooling" and "main heating" may be understood as both cooling and heating demands in the plurality of internal machines 2, but the whole is mainly the cooling or heating demand, and may be determined according to the number of the internal machines 2 for cooling and the number of the internal machines 2 for heating, but also according to the number of the internal machines 2. For example, although the number of the indoor units 2 for cooling is larger than the number of the indoor units 2 for heating, the sum of the numbers of the indoor units 2 for cooling is smaller than the sum of the numbers of the indoor units 2 for heating, and it may be determined as the main heating operation, otherwise, as the main cooling operation.
According to the three-pipe multi-split air-conditioning system 100 disclosed by the embodiment of the invention, the refrigeration requirement on the indoor side under the low-temperature working condition can be effectively met, meanwhile, the freezing of the indoor unit 2 is avoided, and the reliability and the comfort of the operation of the three-pipe multi-split air-conditioning system 100 are ensured.
According to some embodiments of the present invention, as shown in fig. 6, when the three-pipe multi-split system 100 is mainly in heating operation and it is required to adjust the evaporating temperature of the indoor unit 2 for cooling, the second end of the second heat exchanger 22 is switched to be conducted with the second switching port 52 of the second switching device 5 and the second switching port 52 is conducted with the third switching port 53 through the corresponding distribution switching component. Therefore, the evaporation temperature of the indoor unit 2 for refrigeration can be well increased, the freezing of a coil and fins of the indoor unit 2 for refrigeration is avoided, and the comfort level and the reliability of the three-pipe multi-split air-conditioning system 100 are improved. The specific operation of the tri-pipe multi-split system 100 is described in detail in the above description of the present application, and will not be described herein again.
Alternatively, according to some embodiments of the invention, the flow regulating device 4 is a throttle valve. Therefore, the number of parts of the three-pipe multi-split air-conditioning system 100 is effectively reduced by adopting the throttle valve, the arrangement of the parts can be more compact, and the occupied space of the three-pipe multi-split air-conditioning system 100 can be reduced. It will be appreciated that the throttle valve may be a valve that controls the flow of fluid by varying the throttle cross-section or throttle length. However, the present invention is not limited to this, and may be any as long as the flow rate of the refrigerant flowing therethrough can be adjusted. For example, the flow rate adjusting device 4 may be an electronic expansion valve or the like.
Of course, the invention is not limited thereto, and according to other embodiments of the invention, the flow regulating device 4 may also be a plurality of solenoid valves (not shown) connected in parallel. At this time, the opening and closing of the plurality of solenoid valves may be controlled to adjust the flow rate of the refrigerant flowing through the plurality of solenoid valves. Thus, the cost is low by adopting a plurality of electromagnetic valves.
Alternatively, the second switching device 5 is a three-way valve (not shown).
Alternatively, the second switching device 5 may also be a four-way valve, as shown in fig. 1 to 6, and the second switching device 5 further includes a fourth switching port 54, and the fourth switching port 54 is connected to the suction port 121 of the compressor assembly through a capillary tube. At this time, the refrigerant in the three-pipe multi-split system 100 does not substantially flow to the suction port 121 of the compressor unit through the fourth switching port 54 of the second switching device 5. Therefore, the four-way valve is adopted, the switching function can be well realized, and the cost is low.
According to some embodiments of the present invention, as shown in fig. 1-6, the second end of each second heat exchanger 22 is connected to the second switching port 52 of the second switching device 5 through a first flow path 61 and to the discharge port 111 of the compressor assembly through a second flow path 62, and the distribution switching means comprises a first switch 31 provided on the first flow path 61 and a second switch 32 provided on the second flow path 62. Therefore, by arranging the first switch 31 and the second switch 32, the on-off of the first switch 31 and the second switch 32 can be determined according to the actual operation requirement of the three-pipe multi-split air-conditioning system 100, and the three-pipe multi-split air-conditioning system is simple in structure and easy to implement.
A three-pipe multi-split system 100 according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 6.
As shown in fig. 5 and 6, the three-pipe multi-split air-conditioning system 100 mainly includes an outdoor unit 1, a refrigerant distribution device 3, and an indoor unit 2. The outdoor unit 1 may include at least one compressor 11, at least two four-way valves connected to the first heat exchangers 14, one four-way valve connected to the discharge port 111 of the compressor 11, at least two first heat exchangers 14, and other critical components that may be present, such as a first throttling device 15, e.g., a throttle valve, a low pressure tank 12, etc.
Wherein, the low-pressure pipe is provided with a refrigerating inner machine 2 evaporation temperature adjusting device to realize the function of adjusting the evaporation temperature of the refrigerating inner machine 2, and the refrigerating inner machine 2 evaporation temperature adjusting device can be composed of a second switching device 5 such as a four-way valve and a flow adjusting device 4 such as a throttle valve. The throttle valve may be a combination of solenoid valves or an electronic expansion valve.
A throttle valve is arranged between the outlet of the first heat exchanger 14 and the first throttle device 15. A second switching port 52 of the four-way valve is connected to a low pressure pipe, a fourth switching port 54 is connected to an inlet of the low pressure tank 12 through a capillary tube, one of a first switching port 51 and a third switching port 53 is connected to a pipe between the first throttling means 15 and the throttle valve, and the other connecting pipe is also connected to the inlet of the low pressure tank 12.
When the three-pipe multi-split air conditioning system 100 is in pure cooling operation, the flow direction of the refrigerant is as shown in fig. 2: the throttle valve is kept in a full-open state; a second switching port 52 of the four-way valve communicates with the low-pressure tank 12. At this time, the evaporation temperature adjusting device of the refrigeration indoor unit 2 does not function. The high-temperature high-pressure refrigerant discharged from the compressor 11 is cooled to a low-temperature high-pressure refrigerant in the first heat exchanger 14 of the outdoor unit 1, and enters the refrigerant distribution device 3 through the high-pressure liquid pipe, and is sent to the indoor unit 2 for refrigeration to be evaporated, and the formed low-pressure gaseous refrigerant returns to the outdoor unit 1 from the low-pressure pipe and returns to the air suction port 121 of the compressor assembly through the four-way valve.
When the three-pipe multi-split system 100 is in the main cooling operation, the flow direction of the refrigerant is as shown in fig. 3: the throttle valve is kept in a full-open state; a second switching port 52 of the four-way valve communicates with the low-pressure tank 12. At this time, the evaporation temperature adjusting device of the refrigeration indoor unit 2 does not function. A part of the high-temperature and high-pressure refrigerant discharged from the compressor 11 flows to the first heat exchanger 14 of the outdoor unit 1, is cooled into a low-temperature and high-pressure refrigerant, enters the refrigerant distribution device 3 through the high-pressure liquid pipe, and a part of the low-temperature and high-pressure refrigerant passes through the high-pressure gas pipe and is sent to the indoor unit 2 for heating and then returns to the refrigerant distribution device 3, and is mixed with the low-temperature and high-pressure liquid refrigerant of the outdoor unit 1, and then flows into the indoor unit 2 for refrigeration and is evaporated, so that the formed low-pressure gaseous refrigerant returns to the outdoor unit 1 from the.
When the three-pipe multi-split system 100 is running for pure heating, the flow direction of the refrigerant is as shown in fig. 4: the throttle valve is kept in a full-open state; a second switching port 52 of the four-way valve communicates with the low-pressure tank 12. At this time, the evaporation temperature adjusting device of the refrigeration indoor unit 2 does not function. The high temperature and high pressure refrigerant discharged from the compressor 11 is sent to the inner machine 2 for heating through the high pressure gas pipe to be condensed, and the generated low temperature and high pressure liquid refrigerant returns to the refrigerant distribution device 3, returns to the outer machine 1 through the high pressure liquid pipe, is throttled by the first throttling device 15, is evaporated into low pressure gaseous refrigerant in the first heat exchanger 14 of the outer machine 1, and returns to the air suction port 121 of the compressor assembly.
When the three-pipe multi-split air-conditioning system 100 is mainly operated for heating, if there is no need to adjust the evaporation temperature of the indoor unit 2 for cooling, the flow direction of the refrigerant is as shown in fig. 5: the throttle valve is kept in a full-open state; a second switching port 52 of the four-way valve communicates with the low-pressure tank 12. At this time, the evaporation temperature adjusting device of the refrigeration indoor unit 2 does not function. High-temperature and high-pressure refrigerant discharged by the compressor 11 is sent to the inner machine 2 for heating through the high-pressure air pipe to be condensed, the generated low-temperature and high-pressure liquid refrigerant returns to the refrigerant distribution device 3, a part of the low-temperature and high-pressure liquid refrigerant is sent to the inner machine 2 for cooling to be evaporated, and the generated low-pressure steam returns to the outer machine 1 through the low-pressure air pipe; and a part of the refrigerant returns to the external unit 1 through the high-pressure liquid pipe, is throttled by the first throttling device 15, is evaporated into low-pressure gaseous refrigerant in the first heat exchanger 14 of the external unit 1, is merged with the low-pressure gaseous refrigerant returned by the low-pressure liquid pipe, and then returns to the air suction port 121 of the compressor assembly.
When the three-pipe multi-split air conditioning system 100 is mainly operated for heating, if the evaporation temperature of the indoor unit 2 for cooling needs to be adjusted, the flow direction of the refrigerant is as shown in fig. 6: and reversing the four-way valve, wherein a second switching port 52 of the four-way valve is communicated with a pipeline between the throttle valve and the first throttling device 15, and the opening degree of the throttle valve is regulated according to the control requirement of the three-pipe multi-split system 100, so that an intermediate pressure state is generated between the throttle valve and the first throttling device 15. High-temperature and high-pressure refrigerant discharged by a compressor 11 is sent to an inner machine 2 for heating through a high-pressure air pipe to be condensed, the generated low-temperature and high-pressure liquid refrigerant returns to a refrigerant distribution device 3, and a part of the low-temperature and high-pressure liquid refrigerant returns to an outer machine 1 through a high-pressure liquid pipe, is throttled by a throttle valve and a first throttling device 15, and is evaporated into low-pressure gaseous refrigerant in a first heat exchanger 14 of the outer machine 1; a part of the refrigerant is sent to the inner unit 2 for refrigeration to evaporate, the generated medium-pressure refrigerant returns to the outer unit 1 through the low-pressure air pipe, is merged with the refrigerant subjected to the primary throttling by the first throttling device 15, is subjected to the secondary throttling by the throttling valve to form a low-pressure two-phase refrigerant, and returns to the air suction port 121 of the compressor assembly after being evaporated in the first heat exchanger 14 of the outer unit 1.
Other configurations and operations of the tri-pipe multi-split system 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
As shown in fig. 7 to 8, a control method of a three-pipe multi-split system 100 according to an embodiment of a second aspect of the present invention. The three-pipe multi-split system 100 is the three-pipe multi-split system 100 according to the above-mentioned first aspect of the present invention.
As shown in fig. 7, the control method of the three-pipe multi-split air-conditioning system 100 includes the following steps:
when the three-regulation multi-split air-conditioning system 100 meets at least one of the conditions a, B and C, controlling the second switching port 52 of the second switching device 5 to be communicated with the first switching port 51 and keeping the flow regulating device 4 in a fully open state; if not, then,
controlling the conduction between the second switching port 52 and the third switching port 53 of the second switching device 5 and adjusting the flow rate of the refrigerant flowing through the flow rate adjusting device 4;
wherein, the condition a is the non-main heating operation (for example, pure cooling operation, main cooling operation, pure heating operation, etc.) of the three-pipe multi-split air conditioning system 100;
condition B is outdoor ambient temperature T1Satisfies the following conditions: t is1＞a；
Condition C is the evaporation temperature T of the inner unit 2 for refrigeration2Satisfies the following conditions: t is2B and t1The inner machine 2 for cooling does not perform the anti-freeze protection action for the time.
For example, the control method of the regulation circuit that determines whether or not the evaporation temperature of the indoor unit 2 for cooling needs to be operated is:
three-pipe multi-split system 100 masterAt hot running time, if T1If the temperature is higher than a (for example, 8 degrees celsius), it is determined that the evaporation temperature of the inner unit 2 for cooling is not required to be adjusted, and an adjustment circuit that is not required to adjust the evaporation temperature of the inner unit 2 for cooling is operated, that is, the second switching port 52 of the second switching device 5 is controlled to be communicated with the first switching port 51, and the flow rate adjustment device 4 is kept in a fully open state; when T is1A is less than or equal to a, and the evaporation temperature T of the inner machine 2 for refrigeration is detected2< B (e.g., 1 degree Celsius), for a duration greater than t1(e.g., 5 minutes), it is determined that the evaporation temperature of the indoor unit 2 for cooling needs to be adjusted, and a regulation loop that needs to adjust the evaporation temperature of the indoor unit 2 for cooling is operated, and the determination period may be Ta。
It will be appreciated that the frost protection action may be a defrosting operation. But is not limited thereto as long as the purpose of preventing the freezing of the inner unit 2 for cooling can be achieved.
According to the control method of the three-pipe multi-split air-conditioning system 100, the three-pipe multi-split air-conditioning system 100 is adopted, so that the condition that the indoor unit 2 for refrigeration is frozen can be well avoided, and the comfort level and the reliability of the three-pipe multi-split air-conditioning system 100 are improved.
According to some embodiments of the present invention, as shown in fig. 8, the initial opening degree of the flow rate regulation device 4 is K,
when the evaporation temperature T of the inner machine 2 for cooling2Satisfies the following conditions: t is2B and duration t1Or when the inner machine 2 for refrigeration executes the anti-freezing protection action, the opening degree of the flow regulating device 4 is continuously reduced;
when the evaporation temperature T of the inner machine 2 for cooling2Satisfies the following conditions: t is2B, when the inner machine 2 for refrigeration does not execute the anti-freezing protection action, keeping the current opening of the flow regulating device 4 to continue to operate;
when the evaporation temperature T of the inner machine 2 for cooling2Satisfies the following conditions: t is2C and at t2When the inner machine 2 for refrigeration does not execute the anti-freezing protection action within the time, the opening degree of the flow regulating device 4 is regulated;
wherein c > b.
For example, the second switching device 5 and the flow rate adjusting device 4 are controlled as follows:
if the three-pipe multi-split air conditioner system 100 determines that the evaporation temperature of the indoor unit 2 for cooling does not need to be adjusted, the flow adjusting device 4 is fully opened; the second switching port 52 of the second switching device 5 communicates with the low-pressure tank 12;
if the three-pipe multi-split air-conditioning system 100 determines that the evaporation temperature of the indoor unit 2 for cooling needs to be adjusted, the second switching port 52 of the second switching device 5 is communicated with the pipeline between the flow rate adjusting device 4 and the corresponding first throttling device 15, and the control logic of the flow rate adjusting device 4 is as follows: the flow-rate regulating device 4 has an initial opening K during which the evaporation temperature T of the internal machine 2 for cooling is2B duration t ≦ b1Or the inner machine 2 for refrigeration has anti-freezing protection, and the flow regulating device 4 is continuously turned down (for example, the opening degree can be K-X); if the three-pipe multi-split air conditioner system 100 detects the evaporation temperature T of the indoor unit 2 for cooling2B, when the current opening degree of the flow regulating device 4 is greater than b and the anti-freezing protection is not carried out, the current opening degree of the flow regulating device 4 is kept to continue to operate; if the three-pipe multi-split air conditioner system 100 detects the evaporation temperature T of the indoor unit 2 for cooling2C and at t2If there is no freeze-prevention operation within the time, the flow rate adjusting device 4 is opened (for example, the opening may be K + X). Wherein the control period of the opening of the flow regulating device 4 is Tb。
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like 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 do not necessarily 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.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A three-pipe multi-split air conditioning system, comprising:
the outdoor unit comprises a compressor assembly and a plurality of first heat exchanger assemblies arranged in parallel, the compressor assembly comprises an air suction port and an air exhaust port, each first heat exchanger assembly comprises a first switching device, a first heat exchanger and a first throttling device, the first switching device comprises a first interface to a third interface, the first interface is connected with the air exhaust port, the second interface is connected with the first end of the first heat exchanger, the third interface is connected with the air suction port, the second interface is suitable for being switched and conducted with any one of the first interface and the third interface, and the first throttling device is connected with the second end of the first heat exchanger;
the indoor unit comprises a plurality of second heat exchanger assemblies arranged in parallel, the plurality of second heat exchanger assemblies are connected with the plurality of first heat exchanger assemblies in series, each second heat exchanger assembly comprises a second throttling device and a second heat exchanger, one end of each second throttling device is connected with the plurality of first throttling devices, and the other end of each second throttling device is connected with the first end of each second heat exchanger;
the refrigerant distribution device comprises a plurality of distribution switching parts, and the distribution switching parts are correspondingly connected with the second ends of the second heat exchangers one by one;
the flow regulating device is connected between the second end of one of the first heat exchangers and the corresponding first throttling device, and is suitable for regulating the flow of the refrigerant flowing through the flow regulating device;
and the second switching device comprises a first switching port to a third switching port, the first switching port is connected with the air suction port, the third switching port is connected between the flow regulating device and the corresponding first throttling device, the second switching port is suitable for being switched and communicated with any one of the first switching port and the third switching port, and the second end of each second heat exchanger is switchably communicated with any one of the second switching port and the air exhaust port through the corresponding distribution switching part.
2. The three-pipe multi-split air-conditioning system according to claim 1, wherein when the three-pipe multi-split air-conditioning system is mainly in heating operation and an evaporation temperature of the internal unit for cooling needs to be adjusted, the second end of the second heat exchanger is switched to be communicated with the second switching port and the second switching port is communicated with the third switching port through the corresponding distribution switching component.
3. The multi-split three-pipe system as claimed in claim 1 or 2, wherein the flow regulating device is a throttle valve.
4. The multi-split three-pipe system as claimed in claim 1 or 2, wherein the flow regulating device is a plurality of solenoid valves connected in parallel.
5. The multi-split three-pipe system as defined in claim 1 or 2, wherein the second switching device is a three-way valve.
6. A multi-split system as defined in claim 1 or 2, wherein said second switching means is a four-way valve, and said second switching means further comprises a fourth switching port, and said fourth switching port is connected to said suction port through a capillary tube.
7. The tri-pipe multi-split air-conditioning system as claimed in claim 1, wherein the second end of each of the second heat exchangers is connected to the second switching port through a first flow path and to the exhaust port through a second flow path,
the distribution switching member includes a first switch provided on the first flow path and a second switch provided on the second flow path.
8. A control method for a tri-regulation multi-split air-conditioning system according to any one of claims 1 to 7, characterized by comprising the following steps:
when the three-pipe multi-split air-conditioning system meets at least one of a condition A, a condition B and a condition C, controlling the second switching port to be communicated with the first switching port and keeping the flow regulating device in a fully-opened state; if not, then,
controlling the second switching port and the third switching port to be communicated and adjusting the flow of the refrigerant flowing through the flow adjusting device;
the condition A is the non-main heating operation of the three-control multi-split system;
the condition B is the outdoor environment temperature T1Satisfy T1＞a；
The condition C is the evaporation temperature T of the inner machine for refrigeration2Satisfy T2B and t1The inner machine for refrigeration does not perform the anti-freezing protection action within the time.
9. The method as claimed in claim 8, wherein the determination period is Ta。
10. The control method of the three-pipe multi-split air-conditioning system according to claim 8 or 9, wherein the initial opening degree of the flow rate adjusting device is K,
when said T is2Satisfy T2B is ≦ b for the time t1Or when the indoor unit for refrigeration executes the anti-freezing protection action, the opening degree of the flow regulating device is continuously reduced;
when said T is2Satisfy T2B and when the inner machine for refrigeration does not execute the anti-freezing protection actionKeeping the current opening degree of the flow regulating device to continuously operate;
when said T is2Satisfy T2C and at t2When the inner machine for refrigeration does not execute the anti-freezing protection action within the time, the opening degree of the flow regulating device is increased;
wherein c > b.
11. The method of claim 10, wherein the control period of the opening of the flow regulator is Tb。
CN201711384317.XA 2017-12-20 2017-12-20 Three-control multi-split system and control method thereof Active CN108151350B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711384317.XA CN108151350B (en) 2017-12-20 2017-12-20 Three-control multi-split system and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711384317.XA CN108151350B (en) 2017-12-20 2017-12-20 Three-control multi-split system and control method thereof

Publications (2)

Publication Number Publication Date
CN108151350A CN108151350A (en) 2018-06-12
CN108151350B true CN108151350B (en) 2020-05-08

Family

ID=62464593

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711384317.XA Active CN108151350B (en) 2017-12-20 2017-12-20 Three-control multi-split system and control method thereof

Country Status (1)

Country Link
CN (1) CN108151350B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108731187B (en) * 2018-06-20 2020-05-08 广东美的暖通设备有限公司 Three-pipe heat recovery multi-split air conditioner system and control method thereof
CN112443947B (en) * 2019-08-30 2021-11-26 青岛海尔空调电子有限公司 Control method of simultaneous cooling and heating multi-split air conditioning system
CN112797496A (en) * 2019-10-28 2021-05-14 广东美的制冷设备有限公司 Air conditioner indoor unit, air conditioner and control method of air conditioner
CN110762792B (en) * 2019-10-29 2021-02-23 青岛海信日立空调系统有限公司 Control method of air conditioner and air conditioner
CN111928424A (en) * 2020-06-30 2020-11-13 青岛海尔空调电子有限公司 Multi-split air conditioning system

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004198085A (en) * 2002-12-20 2004-07-15 Toshiba Kyaria Kk Air conditioner
JP2005300006A (en) * 2004-04-12 2005-10-27 Hitachi Ltd Multiple type air conditioner
JP2006170541A (en) * 2004-12-16 2006-06-29 Samsung Electronics Co Ltd Air conditioner
KR100702040B1 (en) * 2004-12-28 2007-03-30 엘지전자 주식회사 Multiple air conditioner
JP4192904B2 (en) * 2005-02-24 2008-12-10 三菱電機株式会社 Refrigeration cycle equipment
JP4553761B2 (en) * 2005-03-16 2010-09-29 三洋電機株式会社 Air conditioner
KR100820821B1 (en) * 2006-12-26 2008-04-11 엘지전자 주식회사 Air conditioning system
CN102384538B (en) * 2011-07-05 2013-10-09 广东美的暖通设备限公司 Three-pipe heat recovery multi-connected machine and control method thereof
CN203454455U (en) * 2013-07-22 2014-02-26 广东美的暖通设备有限公司 Three-tube air conditioning system
JP5747968B2 (en) * 2013-10-07 2015-07-15 ダイキン工業株式会社 Heat recovery type refrigeration system
CN203908094U (en) * 2014-04-15 2014-10-29 珠海格力电器股份有限公司 Heat recovery variable refrigerant volume (VRV) system
JP2018080844A (en) * 2015-03-25 2018-05-24 パナソニックＩｐマネジメント株式会社 Air conditioning device
JP6539560B2 (en) * 2015-10-13 2019-07-03 三菱重工サーマルシステムズ株式会社 Air conditioner
CN105509362A (en) * 2015-12-22 2016-04-20 广东志高暖通设备股份有限公司 Multi-connected environment treatment system
CN205619617U (en) * 2016-05-05 2016-10-05 广东志高暖通设备股份有限公司 Multi -split air conditioning system
CN206235054U (en) * 2016-10-08 2017-06-09 广东美的暖通设备有限公司 A kind of multi-functional multi-connected air conditioning system of three control
CN107178833B (en) * 2017-05-31 2023-12-05 珠海格力电器股份有限公司 Heat recovery external machine system and air conditioning system
CN107238226B (en) * 2017-06-29 2023-08-29 广东美的暖通设备有限公司 Multi-split system and control method thereof

Also Published As

Publication number Publication date
CN108151350A (en) 2018-06-12

Similar Documents

Publication Publication Date Title
CN108151350B (en) Three-control multi-split system and control method thereof
JP6685409B2 (en) Air conditioner
CN108731187B (en) Three-pipe heat recovery multi-split air conditioner system and control method thereof
CN107228439B (en) Multi-split system and control method thereof
US9506674B2 (en) Air conditioner including a bypass pipeline for a defrosting operation
JP5213817B2 (en) Air conditioner
CN107110546B (en) Air conditioning apparatus
US8424333B2 (en) Air conditioner
JP6895901B2 (en) Air conditioner
WO2013145006A1 (en) Air conditioning device
EP2829821B1 (en) Heat pump
US20060090487A1 (en) Air conditioner
JPWO2018047331A1 (en) Air conditioner
CN107238226B (en) Multi-split system and control method thereof
JP2008128628A (en) Refrigerating device
CN213841111U (en) Air conditioner
WO2022110761A1 (en) Air conditioner
WO2016208042A1 (en) Air-conditioning device
EP3106768B1 (en) Heat source-side unit and air conditioning device
JP5734205B2 (en) Air conditioner
JP2015117894A (en) Air conditioner outdoor unit
KR101186331B1 (en) Multi-air conditioner for heating and cooling operations at the same time
EP2375187B1 (en) Heat pump apparatus and operation control method of heat pump apparatus
KR102337394B1 (en) Air Conditioner
CN107356009B (en) Multi-split air conditioning system and low-temperature control method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20210625

Address after: 528311 Industrial Road, Penglai Road, Beijiao Town, Shunde District, Guangdong, Foshan

Patentee after: GD MIDEA HEATING & VENTILATING EQUIPMENT Co.,Ltd.

Patentee after: HEFEI MIDEA HEATING & VENTILATING EQUIPMENT Co.,Ltd.

Address before: 528311 Industrial Road, Penglai Road, Beijiao Town, Shunde District, Guangdong, Foshan

Patentee before: GD MIDEA HEATING & VENTILATING EQUIPMENT Co.,Ltd.

Patentee before: MIDEA GROUP Co.,Ltd.