CN107940796B - Multi-split air conditioner system and starting control method of outdoor unit thereof - Google Patents
Multi-split air conditioner system and starting control method of outdoor unit thereof Download PDFInfo
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- CN107940796B CN107940796B CN201711308612.7A CN201711308612A CN107940796B CN 107940796 B CN107940796 B CN 107940796B CN 201711308612 A CN201711308612 A CN 201711308612A CN 107940796 B CN107940796 B CN 107940796B
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B49/022—Compressor control arrangements
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- 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 multi-split system and a starting control method of an outdoor unit thereof, wherein the method comprises the following steps: when a first outdoor unit of the N outdoor units connected in parallel operates in a first mode and a second outdoor unit is in a shutdown state, if an instruction for starting the second outdoor unit is received, a first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a pressure difference is established between a first port and a second port of a first four-way valve or a second four-way valve in the second outdoor unit; controlling the first four-way valve or the second four-way valve with the pressure difference established to be electrified so as to switch the port communication state of the first four-way valve or the second four-way valve; and after the first four-way valve or the second four-way valve is powered on, controlling the compressor in the second outdoor unit to start so as to control the second outdoor unit to start and run in a first mode. Therefore, the pressure difference of the four-way valve can be established, the four-way valve is prevented from being broken down in the switching process, a high-pressure air balance pipe is not required to be arranged, and the cost can be reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a starting control method of an outdoor unit in a multi-split system and the multi-split system.
Background
The existing three-pipe multi-split air conditioner parallel system only has partial outdoor units working, and when the outdoor unit in the shutdown state has a startup requirement, the four-way valve needs to be switched first, and if the four-way valve does not have enough pressure difference, the four-way valve is easy to break down in the switching process. In order to solve the problems, a high-pressure air balance pipe is usually arranged in an existing three-pipe multi-split parallel system, and pressure difference of a four-way valve is established through the high-pressure air balance pipe, however, the installation difficulty and the installation cost of the multi-split system can be greatly increased through the high-pressure air balance pipe.
Disclosure of Invention
The present invention is directed to solving at least one of the problems in the art to some extent. Therefore, a first objective of the present invention is to provide a method for controlling starting of an outdoor unit in a multi-split system, which can not only establish a pressure difference of a four-way valve, avoid a failure of the four-way valve during switching, and ensure smooth opening of the outdoor unit in a shutdown state, but also reduce cost without providing a high pressure air balance pipe.
A second object of the invention is to propose a computer-readable storage medium. A third object of the present invention is to provide a multi-split system.
In order to achieve the above object, a first embodiment of the present invention provides a method for controlling starting of an outdoor unit in a multi-split system, where the multi-split system includes M indoor units and N outdoor units connected in parallel, each of the indoor units includes an indoor heat exchanger, and each of the outdoor units includes a compressor, a first four-way valve, a second four-way valve, an outdoor heat exchanger, and a first throttling element, where in each of the outdoor units, a first port of the first four-way valve is connected to an exhaust port of the compressor, a second port of the first four-way valve is connected to one end of each of the indoor heat exchangers through a first pipeline, a third port of the first four-way valve is connected to one end of each of the indoor heat exchangers through a second pipeline, a first port of the second four-way valve is connected to an exhaust port of the compressor, and a second port of the second four-way valve is connected to one end of the outdoor heat exchanger, a third port of the second four-way valve is connected with a return air port of the compressor, the other end of the outdoor heat exchanger is connected with the other end of each indoor heat exchanger through the first throttling element and a third pipeline, wherein M and N are integers greater than 1, and the starting control method comprises the following steps: when a first outdoor unit of the N outdoor units connected in parallel operates in a first mode and a second outdoor unit is in a shutdown state, if an instruction for starting the second outdoor unit is received, a first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a pressure difference is established between a first port and a second port of a first four-way valve or a second four-way valve in the second outdoor unit; controlling the first four-way valve or the second four-way valve with the pressure difference established to be electrified so as to switch the port communication state of the first four-way valve or the second four-way valve; and after the first four-way valve or the second four-way valve is powered on, controlling the compressor in the second outdoor unit to start so as to control the second outdoor unit to start and run in the first mode.
According to the start control method of the outdoor unit in the multi-split air-conditioning system, when a first outdoor unit of the N outdoor units connected in parallel operates in a first mode and a second outdoor unit is in a shutdown state, if an instruction for starting the second outdoor unit is received, a first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a pressure difference is established between a first port and a second port of a first four-way valve or a second four-way valve in the second outdoor unit, the first four-way valve or the second four-way valve with the established pressure difference is controlled to be powered on, so that the port connection state of the first four-way valve or the second four-way valve is switched, and then a compressor in the second outdoor unit is controlled to be started after the first four-way valve or the second four-way valve is powered on, so that the second outdoor unit is controlled to be started and. The method can establish the pressure difference of the four-way valve, avoid the four-way valve from breaking down in the switching process, ensure the outdoor unit in the shutdown state to be smoothly opened, and can reduce the cost without arranging a high-pressure air balance pipe.
In addition, the start control method for the outdoor unit in the multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, when the first four-way valve or the second four-way valve is powered off, the first port is communicated with the second port, the third port is communicated with the fourth port, and after the first four-way valve or the second four-way valve is powered on, the first port is communicated with the fourth port, and the second port is communicated with the third port.
According to one embodiment of the present invention, the first mode is a heating mode or a cooling mode.
According to an embodiment of the invention, the first restriction element is an electronic expansion valve.
In order to achieve the above object, a second aspect of the present invention provides a computer-readable storage medium having instructions stored therein, wherein when the instructions are executed, the multiple split air conditioner system performs the method for controlling the outdoor unit.
By executing the starting control method of the outdoor unit in the multi-split system, the computer readable storage medium of the embodiment of the invention can not only establish the pressure difference of the four-way valve, avoid the four-way valve from breaking down in the switching process and ensure the outdoor unit in a shutdown state to be smoothly started, but also does not need to be provided with a high-pressure air balance pipe, thereby reducing the cost.
In order to achieve the above object, a third aspect of the present invention provides a multi-split system, including: m indoor units, wherein each indoor unit comprises an indoor heat exchanger; n outdoor units connected in parallel, each outdoor unit comprising a compressor, a first four-way valve, a second four-way valve, outdoor heat exchangers and a first throttling element, wherein a first port of the first four-way valve is connected with an exhaust port of the compressor, a second port of the first four-way valve is connected with one end of each indoor heat exchanger through a first pipeline, a third port of the first four-way valve is connected with one end of each indoor heat exchanger through a second pipeline, a first port of the second four-way valve is connected with an exhaust port of the compressor, a second port of the second four-way valve is connected with one end of each outdoor heat exchanger, a third port of the second four-way valve is connected with a return air port of the compressor, and the other end of each outdoor heat exchanger is connected with the other end of each indoor heat exchanger through the first throttling element and a third pipeline, wherein M and N are integers greater than 1; the controller is used for controlling a first throttling element in the second outdoor unit to be opened to a preset opening degree if an instruction for starting the second outdoor unit is received when a first outdoor unit in the N outdoor units connected in parallel operates in a first mode and the second outdoor unit is shut down, so that a pressure difference is established between a first port and a second port of a first four-way valve or a second four-way valve in the second outdoor unit, controlling the first four-way valve or the second four-way valve with the established pressure difference to be electrified so as to switch the port connection state of the first four-way valve or the second four-way valve, and controlling a compressor in the second outdoor unit to be started after the first four-way valve or the second four-way valve is electrified so as to control the second outdoor unit to start and operate in the first mode.
According to the multi-split system of the embodiment of the invention, each of the M indoor units comprises an indoor heat exchanger, each of the N outdoor units connected in parallel comprises a compressor, a first four-way valve, a second four-way valve, an outdoor heat exchanger and a first throttling element, when the first outdoor unit of the N outdoor units connected in parallel is operated in a first mode and the second outdoor unit is shut down, if an instruction for starting the second outdoor unit is received, the first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a pressure difference is established between a first port and a second port of the first four-way valve or the second four-way valve in the second outdoor unit, the first four-way valve or the second four-way valve with the established pressure difference is controlled to be powered on, so as to switch the port connection state of the first four-way valve or the second four-way valve, and the compressor in the second outdoor unit is controlled to be started after the first four-way valve or the second, to control the second outdoor unit to start operation in the first mode. Therefore, the pressure difference of the four-way valve can be established, the four-way valve is prevented from being broken down in the switching process, the outdoor unit in the shutdown state is ensured to be smoothly opened, a high-pressure air balance pipe is not required to be arranged, and the cost can be reduced.
In addition, the multi-split system proposed according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, when the first four-way valve or the second four-way valve is powered off, the first port is communicated with the second port, the third port is communicated with the fourth port, and after the first four-way valve or the second four-way valve is powered on, the first port is communicated with the fourth port, and the second port is communicated with the third port.
According to one embodiment of the present invention, the first mode is a heating mode or a cooling mode.
According to an embodiment of the invention, the first restriction element is an electronic expansion valve.
Drawings
Fig. 1 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention; and
fig. 2 is a flowchart of a start-up control method of an outdoor unit in 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.
The method for controlling the start of the outdoor unit in the multi-split system and the multi-split system according to the embodiments of the present invention will be described with reference to the accompanying drawings.
In an embodiment of the present invention, a multi-split system includes M indoor units and N outdoor units connected in parallel, each indoor unit including an indoor heat exchanger, each outdoor unit including a compressor, a first four-way valve, a second four-way valve, an outdoor heat exchanger, and a first throttling element, wherein in each outdoor unit, a first port of the first four-way valve is connected to an exhaust port of the compressor, a second port of the first four-way valve is connected to one end of each indoor heat exchanger through a first pipe, a third port of the first four-way valve is connected to one end of each indoor heat exchanger through a second pipe, a first port of the second four-way valve is connected to an exhaust port of the compressor, a second port of the second four-way valve is connected to one end of the outdoor heat exchanger, a third port of the second four-way valve is connected to a return port of the compressor, and the other end of the outdoor heat exchanger is connected to the other end of each indoor heat exchanger, where M and N are both integers greater than 1, for example, M and N may both be 2. The multi-split system including 2 indoor units and 2 outdoor units connected in parallel will be described as an example.
Specifically, as shown in fig. 1, the multi-split system may include a first outdoor unit 10 and a second outdoor unit 20, and a first indoor unit 30 and a second indoor unit 40 connected in parallel. The flow dividing means may include refrigeration cut-off valves 51 and 52, and heating cut-off valves 61 and 62.
The first outdoor unit 10 may include a compressor 11, a first four-way valve 12, a second four-way valve 13, an outdoor heat exchanger 14, a first throttling element 15, a plate heat exchanger 16, a supercooling circuit valve body 17, an oil separator 18, and a low pressure tank 19. Wherein, the exhaust port of the compressor 11 is connected with the second port of the oil separator 18, the third port of the oil separator 18 is respectively connected with the first port of the first four-way valve 12 and the first port of the second four-way valve 13, the first port of the oil separator 18 is respectively connected with the return port of the compressor 11 and one end of the low pressure tank 19 through a bypass capillary tube, the other end of the low pressure tank 19 is respectively connected with the third port of the first four-way valve 12 and the third port of the second four-way valve 13, the other end of the low pressure tank 19 is also respectively connected with the fourth port of the first four-way valve 12 and the fourth port of the second four-way valve 13 through a capillary tube, the second port of the first four-way valve 12 is connected with the first pipeline, the second port of the second four-way valve 13 is connected with one end of the outdoor heat exchanger 14, the other end of the outdoor heat exchanger 14 is connected with the inlet of the first heat exchange flow, an outlet of the first heat exchange flow path of the plate heat exchanger 16 is connected to the third pipeline, an inlet of the second heat exchange flow path of the plate heat exchanger 16 (i.e., an outlet of the first heat exchange flow path of the plate heat exchanger 16) is connected to an outlet of the second heat exchange flow path of the plate heat exchanger 16 through the supercooling return valve body 17, and an outlet of the second heat exchange flow path of the plate heat exchanger 16 is connected to the return port of the compressor 11. Wherein, the first throttling element 15 and the supercooling circuit valve body 17 can be electronic expansion valves.
The second outdoor unit 20 may include a compressor 21, a first four-way valve 22, a second four-way valve 23, an outdoor heat exchanger 24, a first throttling element 25, a plate heat exchanger 26, a supercooling circuit valve body 27, an oil separator 28, and a low pressure tank 29. It should be noted that the second outdoor unit 20 has the same or similar structure as the first outdoor unit 10, and the connection relationship of the components thereof can refer to the connection relationship of the components in the first outdoor unit 10, and in order to avoid redundancy, detailed description thereof is omitted.
The first indoor unit 30 may include an indoor heat exchanger 31 and an indoor throttling element 32. One end of the indoor heat exchanger 31 is connected to the third pipeline through the indoor throttling element 32, the other end of the indoor heat exchanger 31 is connected to the second pipeline through the corresponding refrigeration on-off valve 51, and the other end of the indoor heat exchanger 31 is further connected to the first pipeline through the corresponding heating on-off valve 61. The indoor throttling element 32 may be an electronic expansion valve.
The second indoor unit 40 may include an indoor heat exchanger 41 and an indoor throttling element 42. One end of the indoor heat exchanger 41 is connected to the third pipeline through the indoor throttling element 42, the other end of the indoor heat exchanger 41 is connected to the second pipeline through the corresponding refrigeration on-off valve 52, and the other end of the indoor heat exchanger 31 is also connected to the first pipeline through the corresponding heating on-off valve 62.
Fig. 2 is a flowchart of a start-up control method of an outdoor unit in a multi-split system according to an embodiment of the present invention. As shown in fig. 2, the method for controlling the start of the outdoor unit in the multi-split air-conditioning system may include the following steps:
s1, when the first outdoor unit of the N outdoor units connected in parallel operates in the first mode and the second outdoor unit is in a shutdown state, if an instruction to start the second outdoor unit is received, the first throttling element of the second outdoor unit is controlled to open to a preset opening degree, so that a pressure difference is established between a first port and a second port of the first four-way valve or the second four-way valve of the second outdoor unit. The preset opening degree can be calibrated according to actual conditions.
According to an embodiment of the present invention, the first mode may be a heating mode or a cooling mode.
And S2, controlling the first four-way valve or the second four-way valve with the pressure difference to be electrified so as to switch the port communication state of the first four-way valve or the second four-way valve.
According to one embodiment of the invention, the first port is communicated with the second port and the third port is communicated with the fourth port when the first four-way valve or the second four-way valve is powered off, and the first port is communicated with the fourth port and the second port is communicated with the third port after the first four-way valve or the second four-way valve is powered on.
And S3, controlling the compressor in the second outdoor unit to start after the first four-way valve or the second four-way valve is powered on, so as to control the second outdoor unit to start and operate in the first mode.
In an embodiment of the present invention, when a first outdoor unit of the N parallel outdoor units operates in a cooling mode and a second outdoor unit is in a shutdown state, the first four-way valve in the first outdoor unit is powered on (i.e., the first port is communicated with the fourth port, and the second port is communicated with the third port), the second four-way valve is powered off (i.e., the first port is communicated with the second port, and the third port is communicated with the fourth port), the first four-way valve in the second outdoor unit is powered off (i.e., the first port is communicated with the second port, and the third port is communicated with the fourth port), and the second four-way valve is powered off (i.e., the first port is communicated with the second port, and the third port is communicated with the fourth port). At this time, a first port of the first four-way valve in the second outdoor unit is communicated with the low-pressure tank in the second outdoor unit through the oil separator in the second outdoor unit, a second port of the first four-way valve in the second outdoor unit is communicated with a second port of the first four-way valve in the first outdoor unit, a second port of the first four-way valve in the first outdoor unit is communicated with a third port of the first four-way valve in the first outdoor unit, a third port of the first four-way valve in the first outdoor unit is communicated with the low-pressure tank in the first outdoor unit, and the first port and the second port of the first four-way valve in the second outdoor unit are both in a low-pressure state.
If a refrigeration instruction for starting the second outdoor unit in a shutdown state is received, the first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a high-pressure liquid refrigerant flowing out of the first outdoor unit can sequentially pass through the plate heat exchanger, the first throttling element, the outdoor heat exchanger, the second port and the first port of the second four-way valve in the second outdoor unit and flow to the first port of the first four-way valve in the second outdoor unit, the first port of the first four-way valve in the second outdoor unit is in a high-pressure state, and differential pressure can be smoothly established between the first port and the second port of the first four-way valve in the second outdoor unit. The first four-way valve in the second outdoor unit with the pressure difference established is further controlled to be powered on to switch the port connection state of the first four-way valve (namely, the first port is connected with the fourth port, and the second port is connected with the third port), and the compressor in the second outdoor unit is controlled to be started after the first four-way valve is powered on to control the second outdoor unit to operate in a refrigeration mode, so that high-pressure gaseous refrigerants discharged from the exhaust port of the compressor in the second outdoor unit can be prevented from being communicated with a low-pressure tank in the first outdoor unit through the oil separator in the second outdoor unit, the first four-way valve in the second outdoor unit which is powered off and the first four-way valve in the first indoor unit which is powered on.
Therefore, according to the starting control method of the outdoor unit in the multi-split system, disclosed by the embodiment of the invention, the pressure difference of the four-way valve can be smoothly established by opening the outdoor throttling element in the outdoor unit to be started in advance, so that the four-way valve is prevented from being broken down in the switching process, the outdoor unit to be started in the system can be ensured to be smoothly started, and therefore, a high-pressure air balance pipe is not required to be arranged, the system structure is simplified, the installation and maintenance are greatly simplified, and the cost is saved.
In another embodiment of the present invention, when a first outdoor unit of the N parallel outdoor units operates in a heating mode and a second outdoor unit is in a shutdown state, the first four-way valve in the first outdoor unit is powered off (i.e., the first port is communicated with the second port and the third port is communicated with the fourth port) and the second four-way valve is powered on (i.e., the first port is communicated with the fourth port and the second port is communicated with the third port), the first four-way valve in the second outdoor unit is powered off (i.e., the first port is communicated with the second port and the third port is communicated with the fourth port) and the second four-way valve is powered off (i.e., the first port is communicated with the second port and the third port is communicated with the fourth port). At this time, the high-pressure gaseous refrigerant discharged from the compressor in the first outdoor unit sequentially passes through the first port of the first four-way valve in the first outdoor unit, the second port of the first four-way valve in the second outdoor unit, and the first port of the first four-way valve in the second outdoor unit, and flows to the first port of the second four-way valve in the second outdoor unit, so that the first port of the second four-way valve in the second outdoor unit is in a high-pressure state.
If a heating instruction of the second outdoor unit in a shutdown state is received, a first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, at the moment, a second port of a second four-way valve in the second outdoor unit is communicated with a plate type heat exchanger in the first outdoor unit through an outdoor heat exchanger, a first throttling element and the plate type heat exchanger in the second outdoor unit, so that a second port of a second four-way valve in the second outdoor unit is in a low-pressure state, and a pressure difference is smoothly established between the first port and the second port of the second four-way valve in the second outdoor unit. And further controlling the second four-way valve in the second outdoor unit with the pressure difference established to be electrified so as to switch the port communication state of the second four-way valve (namely, the first port is communicated with the fourth port, and the second port is communicated with the third port), and controlling the compressor in the second outdoor unit to be started after the second four-way valve is electrified so as to control the second outdoor unit to operate in a heating mode.
Therefore, according to the starting control method of the outdoor unit in the multi-split system, disclosed by the embodiment of the invention, the pressure difference of the four-way valve can be smoothly established by opening the outdoor throttling element in the outdoor unit to be started in advance, so that the four-way valve is prevented from being broken down in the switching process, the outdoor unit to be started in the system can be ensured to be smoothly started, and therefore, a high-pressure air balance pipe is not required to be arranged, the system structure is simplified, the installation and maintenance are greatly simplified, and the cost is saved.
In summary, according to the start control method of the outdoor unit in the multi-split air-conditioning system in the embodiment of the present invention, when a first outdoor unit of the N outdoor units connected in parallel operates in the first mode and a second outdoor unit is in a shutdown state, if an instruction to start the second outdoor unit is received, a first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a pressure difference is established between a first port and a second port of a first four-way valve or a second four-way valve in the second outdoor unit, and the first four-way valve or the second four-way valve with the established pressure difference is controlled to be powered on to switch a port connection state of the first four-way valve or the second four-way valve, so that a compressor in the second outdoor unit is controlled to start and operate in the first mode after the first four-way valve or the second four-way valve is powered on. By the method, the pressure difference of the four-way valve can be established, the four-way valve is prevented from being broken down in the switching process, the outdoor unit in the shutdown state can be smoothly started in any mode, an air balance pipe is not required to be arranged, and the cost is reduced.
In addition, an embodiment of the present invention also provides a computer-readable storage medium having instructions stored therein, and when the instructions are executed, the multi-split system performs the above-described start control method of the outdoor unit.
By executing the starting control method of the outdoor unit in the multi-split system, the computer readable storage medium of the embodiment of the invention can not only establish the pressure difference of the four-way valve, avoid the four-way valve from breaking down in the switching process and ensure the outdoor unit in a shutdown state to be smoothly started, but also does not need to be provided with a high-pressure air balance pipe, thereby reducing the cost.
Fig. 1 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention. As shown in fig. 1, the multi-split system may include: m indoor units, N parallel outdoor units, and a controller (not shown). M and N are both integers greater than 1, for example, M and N may both be 2. The multi-split system including 2 indoor units and 2 outdoor units connected in parallel will be described as an example.
The 2 parallel outdoor units may include a first outdoor unit 10 and a second outdoor unit 20, and the 2 indoor units may include a first indoor unit 30 and a second indoor unit 40.
The first outdoor unit 10 may include a compressor 11, a first four-way valve 12, a second four-way valve 13, an outdoor heat exchanger 14, a first throttling element 15, a plate heat exchanger 16, a supercooling circuit valve body 17, an oil separator 18, and a low pressure tank 19. Wherein, the exhaust port of the compressor 11 is connected with the second port of the oil separator 18, the third port of the oil separator 18 is respectively connected with the first port of the first four-way valve 12 and the first port of the second four-way valve 13, the first port of the oil separator 18 is respectively connected with the return port of the compressor 11 and one end of the low pressure tank 19 through a bypass capillary tube, the other end of the low pressure tank 19 is respectively connected with the third port of the first four-way valve 12 and the third port of the second four-way valve 13, the other end of the low pressure tank 19 is also respectively connected with the fourth port of the first four-way valve 12 and the fourth port of the second four-way valve 13 through a capillary tube, the second port of the first four-way valve 12 is connected with the first pipeline, the second port of the second four-way valve 13 is connected with one end of the outdoor heat exchanger 14, the other end of the outdoor heat exchanger 14 is connected with the inlet of the first heat exchange flow, an outlet of the first heat exchange flow path of the plate heat exchanger 16 is connected to the third pipeline, an inlet of the second heat exchange flow path of the plate heat exchanger 16 (i.e., an outlet of the first heat exchange flow path of the plate heat exchanger 16) is connected to an outlet of the second heat exchange flow path of the plate heat exchanger 16 through the supercooling return valve body 17, and an outlet of the second heat exchange flow path of the plate heat exchanger 16 is connected to the return port of the compressor 11. Wherein, the first throttling element 15 and the supercooling circuit valve body 17 can be electronic expansion valves.
The second outdoor unit 20 may include a compressor 21, a first four-way valve 22, a second four-way valve 23, an outdoor heat exchanger 24, a first throttling element 25, a plate heat exchanger 26, a supercooling circuit valve body 27, an oil separator 28, and a low pressure tank 29. It should be noted that the second outdoor unit 20 and the second outdoor unit 10 have the same or similar structures, and the connection relationship of the components thereof can refer to the connection relationship of the components in the first outdoor unit 10, and in order to avoid redundancy, detailed description thereof is omitted.
The first indoor unit 30 may include an indoor heat exchanger 31 and an indoor throttling element 32. One end of the indoor heat exchanger 31 is connected to the third pipeline through the indoor throttling element 32, the other end of the indoor heat exchanger 31 is connected to the second pipeline through the corresponding refrigeration on-off valve 51, and the other end of the indoor heat exchanger 31 is further connected to the first pipeline through the corresponding heating on-off valve 61. The indoor throttling element 32 may be an electronic expansion valve.
The second indoor unit 40 may include an indoor heat exchanger 41 and an indoor throttling element 42. One end of the indoor heat exchanger 41 is connected to the third pipeline through the indoor throttling element 42, the other end of the indoor heat exchanger 41 is connected to the second pipeline through the corresponding refrigeration on-off valve 52, and the other end of the indoor heat exchanger 31 is also connected to the first pipeline through the corresponding heating on-off valve 62.
The controller is configured to, when the first outdoor unit 10 of the N parallel outdoor units operates in the first mode and the second outdoor unit 20 is turned off, if an instruction to start the second outdoor unit 20 is received, control the first throttling element 25 of the second outdoor unit 20 to be opened to a preset opening degree, so as to establish a pressure difference between the first port and the second port of the first four-way valve 22 or the second four-way valve 23 of the second outdoor unit 20, control the first four-way valve 22 or the second four-way valve 23, which establishes the pressure difference, to be powered on, so as to switch a port connection state of the first four-way valve 22 or the second four-way valve 23, and control the compressor 21 of the second outdoor unit 20 to be started up after the first four-way valve 22 or the second four-way valve 23 is powered on, so as to control the second outdoor unit 20 to start up and operate in.
According to one embodiment of the present invention, the first four- way valves 12 and 22 or the second four-way valves 13 and 23 communicate the first port with the second port and the third port with the fourth port when they are powered off, and switch to communicate the first port with the fourth port and the second port with the third port after they are powered on.
According to an embodiment of the present invention, the first mode may be a heating mode or a cooling mode.
According to one embodiment of the invention, the first throttling elements 15 and 25 may be electronic expansion valves.
It should be noted that details not disclosed in the multi-split air-conditioning system of the embodiment of the present invention refer to details disclosed in the method for controlling the start-up of the outdoor unit in the multi-split air-conditioning system of the embodiment of the present invention, and detailed descriptions thereof are omitted here.
According to the multi-split system of the embodiment of the invention, each of the M indoor units comprises an indoor heat exchanger, each of the N outdoor units connected in parallel comprises a compressor, a first four-way valve, a second four-way valve, an outdoor heat exchanger and a first throttling element, when the first outdoor unit of the N outdoor units connected in parallel is operated in a first mode and the second outdoor unit is shut down, if an instruction for starting the second outdoor unit is received, the first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a pressure difference is established between a first port and a second port of the first four-way valve or the second four-way valve in the second outdoor unit, the first four-way valve or the second four-way valve with the established pressure difference is controlled to be powered on, so as to switch the port connection state of the first four-way valve or the second four-way valve, and the compressor in the second outdoor unit is controlled to be started after the first four-way valve or the second, to control the second outdoor unit to start operation in the first mode. Therefore, the pressure difference of the four-way valve can be established, the four-way valve is prevented from being broken down in the switching process, the outdoor unit in the shutdown state is ensured to be smoothly opened, a high-pressure air balance pipe is not required to be arranged, and the cost can be reduced.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present 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 (9)
1. A starting control method for outdoor units in a multi-split system is characterized in that the multi-split system comprises M indoor units and N outdoor units connected in parallel, each indoor unit comprises an indoor heat exchanger, each outdoor unit comprises a compressor, a first four-way valve, a second four-way valve, an outdoor heat exchanger and a first throttling element, wherein in each outdoor unit, a first port of the first four-way valve is connected with an exhaust port of the compressor, a second port of the first four-way valve is connected with one end of each indoor heat exchanger through a first pipeline, a third port of the first four-way valve is connected with one end of each indoor heat exchanger through a second pipeline, a first port of the second four-way valve is connected with the exhaust port of the compressor, and a second port of the second four-way valve is connected with one end of the outdoor heat exchanger, a third port of the second four-way valve is connected with a return air port of the compressor, the other end of the outdoor heat exchanger is connected with the other end of each indoor heat exchanger through the first throttling element and a third pipeline, wherein M and N are integers greater than 1, and the starting control method comprises the following steps:
when a first outdoor unit of the N outdoor units connected in parallel operates in a first mode and a second outdoor unit is in a shutdown state, if an instruction for starting the second outdoor unit is received, a first throttling element in the second outdoor unit is controlled to be opened to a preset opening degree, so that a pressure difference is established between a first port and a second port of a first four-way valve or a second four-way valve in the second outdoor unit;
controlling the first four-way valve or the second four-way valve with the pressure difference established to be electrified so as to switch the port communication state of the first four-way valve or the second four-way valve;
and after the first four-way valve or the second four-way valve is powered on, controlling the compressor in the second outdoor unit to start so as to control the second outdoor unit to start and run in the first mode.
2. The method for controlling starting of an outdoor unit in a multi-split air-conditioning system according to claim 1, wherein the first port communicates with the second port and the third port communicates with the fourth port when the first four-way valve or the second four-way valve is powered off, and the first port communicates with the fourth port and the second port communicates with the third port when the first four-way valve or the second four-way valve is powered on.
3. The method for controlling starting of an outdoor unit in a multi-split system as claimed in claim 1, wherein the first mode is a heating mode or a cooling mode.
4. The method for controlling the start-up of an outdoor unit in a multi-split air conditioning system as set forth in claim 1, wherein the first throttling element is an electronic expansion valve.
5. A computer-readable storage medium having instructions stored therein, wherein when the instructions are executed, the multiple split air conditioning system performs the outdoor unit startup control method according to any one of claims 1 to 4.
6. A multiple on-line system, comprising:
m indoor units, wherein each indoor unit comprises an indoor heat exchanger;
n outdoor units connected in parallel, each outdoor unit comprising a compressor, a first four-way valve, a second four-way valve, outdoor heat exchangers and a first throttling element, wherein a first port of the first four-way valve is connected with an exhaust port of the compressor, a second port of the first four-way valve is connected with one end of each indoor heat exchanger through a first pipeline, a third port of the first four-way valve is connected with one end of each indoor heat exchanger through a second pipeline, a first port of the second four-way valve is connected with an exhaust port of the compressor, a second port of the second four-way valve is connected with one end of each outdoor heat exchanger, a third port of the second four-way valve is connected with a return air port of the compressor, and the other end of each outdoor heat exchanger is connected with the other end of each indoor heat exchanger through the first throttling element and a third pipeline, wherein M and N are integers greater than 1;
the controller is used for controlling a first throttling element in the second outdoor unit to be opened to a preset opening degree if an instruction for starting the second outdoor unit is received when a first outdoor unit in the N outdoor units connected in parallel operates in a first mode and the second outdoor unit is shut down, so that a pressure difference is established between a first port and a second port of a first four-way valve or a second four-way valve in the second outdoor unit, controlling the first four-way valve or the second four-way valve with the established pressure difference to be electrified so as to switch the port connection state of the first four-way valve or the second four-way valve, and controlling a compressor in the second outdoor unit to be started after the first four-way valve or the second four-way valve is electrified so as to control the second outdoor unit to start and operate in the first mode.
7. A multi-split system as claimed in claim 6, wherein the first or second four-way valve has a first port communicating with the second port and a third port communicating with the fourth port when it is powered off, and is switched to have the first port communicating with the fourth port and the second port communicating with the third port when it is powered on.
8. The multi-split system as claimed in claim 6, wherein the first mode is a heating mode or a cooling mode.
9. A multi-split system as claimed in claim 6, wherein the first throttling element is an electronic expansion valve.
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| JP2006194565A (en) * | 2005-01-17 | 2006-07-27 | Mitsubishi Heavy Ind Ltd | Air conditioner |
| KR101533703B1 (en) * | 2008-09-30 | 2015-07-03 | 엘지전자 주식회사 | Multi-type air conditioner and Control method of the same |
| JP2013104583A (en) * | 2011-11-11 | 2013-05-30 | Gunma Denki Kk | Air-conditioning water heater |
| CN202885370U (en) * | 2012-08-03 | 2013-04-17 | 广东美的暖通设备有限公司 | Air-conditioning system |
| CN103673438B (en) * | 2012-09-20 | 2015-11-25 | 广东美的暖通设备有限公司 | A kind of sustainable multi-connected air conditioner of heating and Defrost method thereof |
| CN104567094B (en) * | 2013-10-10 | 2017-12-08 | 珠海格力电器股份有限公司 | Heat recovery system and there is its recuperation of heat unit |
| CN203518332U (en) * | 2013-10-10 | 2014-04-02 | 珠海格力电器股份有限公司 | Heat recovery system and heat recovery unit with same |
| CN104930637B (en) * | 2014-03-18 | 2018-02-09 | 珠海格力电器股份有限公司 | Four-way valve reverse control method, device and air-conditioning system |
| CN104101054B (en) * | 2014-07-07 | 2017-01-11 | 广东美的暖通设备有限公司 | Control method and system of variable refrigerant flow (VRF) air conditioner |
| CN105066540B (en) * | 2015-07-20 | 2017-08-01 | 广东美的暖通设备有限公司 | Convertible frequency air-conditioner starts control method, control system and its air conditioner |
| CN105953468B (en) * | 2016-04-29 | 2018-11-20 | 广东美的暖通设备有限公司 | Multi-line system and its valve body control method for crossing cold loop |
| CN106440455B (en) * | 2016-09-19 | 2019-04-30 | 广东美的暖通设备有限公司 | The method for handover control of multi-line system and its indoor unit operational mode |
| CN106440555A (en) * | 2016-10-08 | 2017-02-22 | 广东美的暖通设备有限公司 | Multi-split system and control method thereof |
| CN107228439B (en) * | 2017-06-29 | 2023-07-11 | 广东美的暖通设备有限公司 | Multi-split system and control method thereof |
| 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 |
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