CN115235140B - Multi-split air conditioning system, control method and storage medium - Google Patents
Multi-split air conditioning system, control method and storage medium Download PDFInfo
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- CN115235140B CN115235140B CN202210717585.3A CN202210717585A CN115235140B CN 115235140 B CN115235140 B CN 115235140B CN 202210717585 A CN202210717585 A CN 202210717585A CN 115235140 B CN115235140 B CN 115235140B
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- refrigeration
- heat exchanger
- electromagnetic valve
- air conditioning
- conditioning system
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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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 provides a multi-split air conditioning system, a control method and a storage medium, wherein the system comprises the following components: the external heat exchanger is communicated with the first refrigeration inlet, the first refrigeration main outlet, the second refrigeration inlet and the second refrigeration main outlet one by one through a first branch pipe, one end of the fifth electromagnetic valve is connected between the fourth electromagnetic valve and the first refrigeration inlet on the first branch pipe, and the other end of the fifth electromagnetic valve is connected between the third electromagnetic valve and the second refrigeration inlet; the compressor is provided with a bypass exhaust pipe at the exhaust end, and the bypass exhaust pipe is directly communicated with the first refrigeration main outlet and the second refrigeration main outlet one by one through a third branch pipe; the first refrigeration auxiliary outlet and the second refrigeration auxiliary outlet are communicated with the four-way valve one by one through the second branch pipe. According to the multi-split air conditioning system, the control method and the storage medium, after the multi-split air conditioning system is started, the parallel operation of refrigeration and heating is supported among different internal machines on the premise that the multi-split air conditioning system is restarted without stopping.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to a multi-split air conditioning system, a control method and a storage medium.
Background
At present, when a multi-split air conditioning system in the market is operated, two operation modes of refrigeration and heating cannot exist in the same multi-split system at the same time.
As shown in fig. 1, the air conditioner is mainly controlled by first entering, namely: when the system is started, the operation mode of the first internal machine is set to be refrigeration, and the operation modes of the other internal machines cannot be set to be heating unless the system is restarted after being stopped; similarly, when the operation mode of the first internal machine is set to be heating, the operation modes of the other internal machines cannot be set to be cooling unless the system is restarted after shutdown.
Disclosure of Invention
In view of this, the technical problems to be solved by the present invention are: the first aspect is to provide a multi-split air conditioning system, so that after the multi-split air conditioning system is started, different internal machines can support parallel operation of a refrigeration mode and a heating mode on the premise of no shutdown and restarting.
In order to solve the technical problem of the first aspect, the invention provides a multi-split air conditioning system, which comprises a compressor, a four-way valve, an external heat exchanger and a multi-split internal heat exchanger, wherein the multi-split internal heat exchanger at least comprises a first internal heat exchanger and a second internal heat exchanger, the first internal heat exchanger comprises a first refrigeration inlet, a first refrigeration main outlet and a first refrigeration auxiliary outlet, and the second internal heat exchanger comprises a second refrigeration inlet, a second refrigeration main outlet and a second refrigeration auxiliary outlet;
the external heat exchanger is communicated with the first refrigeration inlet, the first refrigeration main outlet, the second refrigeration inlet and the second refrigeration main outlet one by one through a first branch pipe, and a fourth electromagnetic valve, a sixth electromagnetic valve, a third electromagnetic valve and a seventh electromagnetic valve are correspondingly arranged between the external heat exchanger and the first refrigeration inlet, the first refrigeration main outlet, the second refrigeration inlet and the second refrigeration main outlet; a fifth electromagnetic valve is further arranged on the first branch pipe, one end of the fifth electromagnetic valve is connected between the fourth electromagnetic valve and the first refrigeration inlet, and the other end of the fifth electromagnetic valve is connected between the third electromagnetic valve and the second refrigeration inlet;
the compressor is provided with a bypass exhaust pipe at the exhaust end, the bypass exhaust pipe is directly communicated with the first refrigeration main outlet and the second refrigeration main outlet one by one through a third branch pipe, a first branch pipe expansion valve is arranged on a branch pipe of the third branch pipe corresponding to the first refrigeration main outlet, and a second branch pipe expansion valve is arranged on a branch pipe of the third branch pipe corresponding to the second refrigeration main outlet;
the first refrigeration auxiliary outlets and the second refrigeration auxiliary outlets are communicated with the four-way valves one by one through second branch pipes, the branch pipes of the second branch pipes corresponding to the first refrigeration auxiliary outlets are provided with first electromagnetic valves, and the branch pipes of the second refrigeration auxiliary outlets are provided with second electromagnetic valves.
By the multi-split air conditioning system, after the multi-split air conditioning system is started, the parallel operation of a refrigeration mode and a heating mode can be supported among different internal machines on the premise of no shutdown and restarting.
Preferably, the multi-split air conditioning system is of a one-split multi-split type.
The multi-split air conditioning system is particularly suitable for one-split multi-split air conditioning system, namely when only one external machine heat exchanger exists, the refrigerating and heating among the multiple internal machines can still keep parallel operation without stopping, so that the application range of the multi-split air conditioning system is greatly expanded, and the configuration cost of the multi-split air conditioning system is saved.
Preferably, there is only one each of the compressor and the four-way valve.
According to the multi-split air conditioning system, even when only one compressor and one four-way valve are arranged, the multi-split air conditioning system can still run in parallel without stopping the machine when the refrigerating and heating among the multi-split air conditioning systems are carried out, so that the application range of the multi-split air conditioning system is greatly expanded, and the configuration cost of the multi-split air conditioning system is saved.
Preferably, on the first internal machine heat exchanger, the first auxiliary refrigerating outlet is arranged adjacent to one end of the first main refrigerating outlet, and at least one heat exchanger U-shaped copper pipe or one row of heat exchange flow paths are arranged between the first auxiliary refrigerating outlet and the first main refrigerating outlet;
and/or on the second internal machine heat exchanger, the second auxiliary refrigerating outlet is arranged near one end of the second main refrigerating outlet, and at least one U-shaped copper pipe or one row of heat exchange flow paths of the heat exchanger are arranged between the second auxiliary refrigerating outlet and the second main refrigerating outlet.
Taking the first inner machine heat exchanger as an example, the first refrigeration auxiliary outlet is formed at one end adjacent to the first refrigeration main outlet, so that the first inner machine heat exchanger is provided with two refrigerant outlets to be matched with the first inner machine heat exchanger to carry out adaptive adjustment on the use state; the specific opening position of the first refrigeration auxiliary outlet can be set in a related optimization mode according to actual needs. The same is true for the second refrigeration aid outlet.
Preferably, the first branch pipe is at least a quarter branch pipe, a fourth branch pipe is connected to the rear end of the branch pipe provided with the fourth electromagnetic valve, a fifth branch pipe is connected to the rear end of the branch pipe provided with the third electromagnetic valve, and the fourth branch pipe and the fifth branch pipe share a section of branch pipe for the fifth electromagnetic valve to be installed on.
When the multi-split air conditioning system is one split-two, the first branch pipe can be a four-branch pipe, but the fourth branch pipe and the fifth branch pipe are connected, so that the installation of the fifth electromagnetic valve is convenient. In this case, the second sub-manifold, the third sub-manifold, the fourth sub-manifold, and the fifth sub-manifold may be one sub-manifold. When the multi-split air conditioning system is more complex, the second branch pipe, the third branch pipe and the first branch pipe connected with the fourth branch pipe and the fifth branch pipe can be adaptively selected according to actual needs.
The technical problems to be solved by the invention are as follows: the second aspect provides a control method of a multi-split air conditioning system, and/or the third aspect provides a computer readable storage medium, so that after the multi-split air conditioning system is started, different internal machines can support parallel operation of a cooling mode and a heating mode without stopping and restarting.
In order to solve the technical problem of the second aspect, the present invention provides a control method of a multi-split air conditioning system, which uses the multi-split air conditioning system according to any embodiment of the first aspect, and when the multi-split air conditioning system is one-split-two and full-open refrigeration, the method includes the following steps:
s1: closing the first branch pipe expansion valve, the second branch pipe expansion valve, the fifth electromagnetic valve, the sixth electromagnetic valve and the seventh electromagnetic valve;
s2: opening the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve;
s3: and starting full-open refrigeration, wherein the four-way valve is electrified and is used according to a refrigeration loop.
When the four-way valve is fully opened for refrigeration, the four-way valve is electrified and is used according to a refrigeration loop, under the action of the steps S1-S2, the outer machine heat exchanger is used as a condenser, and the first inner machine heat exchanger and the second inner machine heat exchanger are used as evaporators, so that the two inner machines can be put into operation according to a refrigeration mode, namely, the refrigeration is fully opened.
Preferably, after step S3, when the first indoor unit heat exchanger is changed to a heating operation, the method further includes the steps of:
s4: closing the first electromagnetic valve and the fourth electromagnetic valve;
s5: and opening the first branch pipe expansion valve and the fifth electromagnetic valve.
Under the full-open refrigeration, when the first inner machine heat exchanger changes the heating operation, the four-way valve does not need to be changed and still keeps the refrigeration loop to be used (namely, power-down reversing and restarting are not needed), and then under the action of the steps S4-S5, the second inner machine heat exchanger still serves as an evaporator, and the first inner machine heat exchanger is used together as a condenser in cooperation with the outer machine heat exchanger. Therefore, the heating mode of the first internal machine heat exchanger and the refrigerating mode of the second internal machine heat exchanger can be kept to run in parallel without stopping, the heat recovery of the multi-split air conditioning system can be greatly improved while the convenience selection of different users is improved, and the working efficiency of the multi-split air conditioning system is improved.
Preferably, after step S3, when the multi-split air conditioning system is fully on for heating, the method further includes the following steps:
s6: the four-way valve is powered down and commutated;
s7: opening the first branch pipe expansion valve and the second branch pipe expansion valve;
s8: and starting the full-open heating, wherein the four-way valve is electrified again and is put into use according to a heating loop.
When the multi-split air conditioning system is fully opened for cooling, the four-way valve is required to be powered down, commutated and restarted to switch the switching state of the commutated loop, in particular to switch the cooling loop into the heating loop. And under the action of the steps S6-S8, the heat exchanger of the outer machine is used as an evaporator, and the heat exchanger of the first inner machine and the heat exchanger of the second inner machine are used as condensers, so that the two inner machines can be put into operation according to a heating mode, namely, the heating full-open is realized. In addition, through the setting of step S7, the heating performance of the multi-split air conditioning system can be improved.
Preferably, after step S8, when the second indoor unit heat exchanger is changed to a cooling operation, the method further includes the steps of:
s9: closing the second branch pipe expansion valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve;
s10: and opening the fifth electromagnetic valve and the seventh electromagnetic valve.
Under the condition of full heating, when the second inner machine heat exchanger changes the refrigerating operation, the four-way valve does not need to be changed and still keeps the heating loop to be used (namely, power-down reversing and restarting are not needed), and further under the action of the steps S9-S10, the first inner machine heat exchanger still serves as a condenser, and the second inner machine heat exchanger is used together as an evaporator in cooperation with the outer machine heat exchanger. Therefore, the refrigerating mode of the second internal machine heat exchanger and the heating mode of the first internal machine heat exchanger can be kept to run in parallel without stopping, the heat recovery of the multi-split air conditioning system can be greatly improved while the convenience selections of different users are improved, and the working efficiency of the multi-split air conditioning system is improved.
To solve the above-mentioned technical problem of the third aspect, the present invention provides a computer readable storage medium, where a computer program is stored, where the computer program is read and executed by a processor, and the method according to any embodiment of the second aspect is implemented.
Compared with the prior art, the multi-split air conditioning system, the control method and the storage medium have the following beneficial effects:
1) After the multi-split air conditioning system is started, on the premise that the multi-split air conditioning system is restarted without stopping, the parallel operation of a refrigeration mode and a heating mode can be supported among different internal machines;
2) The heat recovery of the multi-split air conditioning system can be greatly improved while the convenience selections of different users are improved, and the working efficiency of the multi-split air conditioning system is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 is a schematic diagram of a multi-split air conditioning system according to the background art of the present invention;
fig. 2 is a schematic diagram of a multi-split air conditioning system according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram illustrating a refrigerant flow direction of the multi-split air conditioning system illustrated in FIG. 2 under full-on cooling;
FIG. 4 is a schematic diagram illustrating a refrigerant flow direction of the multi-split air conditioning system of FIG. 3 under one of the indoor units for heat transfer;
FIG. 5 is a schematic diagram illustrating a refrigerant flow direction of the multi-split air conditioning system of FIG. 3 under full on heating (i.e. full on-heat) conditions;
fig. 6 is a schematic diagram of a refrigerant flow direction of the multi-split air conditioning system in fig. 5 under one of the indoor units for cooling.
Reference numerals illustrate:
1-compressor, 11-bypass blast pipe, 2-four-way valve, 3-outer machine heat exchanger, 41-first branch pipe, 42-second branch pipe, 43-third branch pipe, 44-fourth branch pipe, 45-fifth branch pipe, 5-first inner machine heat exchanger, 51-first refrigeration inlet, 52-first refrigeration main outlet, 53-first refrigeration auxiliary outlet, 6-second inner machine heat exchanger, 61-second refrigeration inlet, 62-second refrigeration main outlet, 63-second refrigeration auxiliary outlet, 71-first solenoid valve, 72-second solenoid valve, 73-third solenoid valve, 74-fourth solenoid valve, 75-fifth solenoid valve, 76-sixth solenoid valve, 77-seventh solenoid valve, 81-first branch pipe expansion valve, 82-second branch pipe expansion valve, 91-first inner machine expansion valve, 92-second inner machine expansion valve, 93-outer machine expansion valve.
Detailed Description
In order to make the above objects, technical solutions and advantages of the present invention more comprehensible, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments of the present invention described herein are only some of the embodiments constituting the present invention, which are intended to be illustrative of the present invention and not limiting of the present invention, and the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Example 1
Referring to fig. 2-6, the invention provides a multi-split air conditioning system, which comprises a compressor 1, a four-way valve 2, an external heat exchanger 3 and a multi-split internal heat exchanger system, wherein the multi-split internal heat exchanger system at least comprises a first internal heat exchanger 5 and a second internal heat exchanger 6, the first internal heat exchanger 5 comprises a first refrigeration inlet 51, a first refrigeration main outlet 52 and a first refrigeration auxiliary outlet 53, and the second internal heat exchanger 6 comprises a second refrigeration inlet 61, a second refrigeration main outlet 62 and a second refrigeration auxiliary outlet 63;
the external heat exchanger 3 is uniformly communicated with the first refrigeration inlet 51, the first refrigeration main outlet 52, the second refrigeration inlet 61 and the second refrigeration main outlet 62 through a first branch pipe 41, a fourth electromagnetic valve 74 is arranged on a branch pipe corresponding to the first refrigeration inlet 51, a sixth electromagnetic valve 76 is arranged on a branch pipe corresponding to the first refrigeration main outlet 52, a third electromagnetic valve 73 is arranged on a branch pipe corresponding to the second refrigeration inlet 61, and a seventh electromagnetic valve 77 is arranged on a branch pipe corresponding to the second refrigeration main outlet 62;
a fifth electromagnetic valve 75 is further disposed on the first branch pipe 41, one end of the fifth electromagnetic valve 75 is connected between the fourth electromagnetic valve 74 and the first refrigeration inlet 51, and the other end is connected between the third electromagnetic valve 73 and the second refrigeration inlet 61;
the compressor 1 is provided with a bypass exhaust pipe 11 at an exhaust end thereof, the bypass exhaust pipe 11 is directly communicated with the first main refrigerating outlet 52 and the second main refrigerating outlet 62 one by one through a third branch pipe 43, a first branch pipe expansion valve 81 is arranged on a branch pipe of the third branch pipe 43 corresponding to the first main refrigerating outlet 52, and a second branch pipe expansion valve 82 is arranged on a branch pipe of the second main refrigerating outlet 62;
the first auxiliary refrigerating outlet 53 and the second auxiliary refrigerating outlet 63 are respectively communicated with the four-way valves 2 one by one through a second branch pipe 42, a first electromagnetic valve 71 is arranged on a branch pipe of the second branch pipe 42 corresponding to the first auxiliary refrigerating outlet 53, and a second electromagnetic valve 72 is arranged on a branch pipe of the second auxiliary refrigerating outlet 63.
Specifically, on the basis of well-known connection according to the prior art, the compressor 1, the four-way valve 2, the external machine heat exchanger 3 and the multi-connected internal machine system are set through the further combination of the aspects, so that after the multi-connected air conditioning system is started, the parallel operation of a refrigerating mode and a heating mode can be supported among different internal machines on the premise of no shutdown and restarting. More specifically:
under different scenes, through adopting the combination control of adapting to the seven electromagnetic valves and the two branch expansion valves, the three of the external machine heat exchanger 3, the first internal machine heat exchanger 5 and the second internal machine heat exchanger 6 can be combined arbitrarily on the premise of not changing the original reversing loop of the four-way valve 2, for example:
when the system is started, the operation mode of the first internal machine is set to refrigeration, and the reversing loop of the four-way valve 2 is shown in fig. 3 after the four-way valve is electrified, and is marked as a refrigeration loop, at this time, the external machine heat exchanger 3 operates as a condenser of the first internal machine. Then, the second internal machine starts heating, the four-way valve 2 does not need to be changed, and only needs to be adjusted adaptively to the corresponding electromagnetic valve and the branch pipe expansion valve, the second internal machine also operates as a condenser of the first internal machine, so that the second internal machine can be put into operation in a heating mode, and the first internal machine still keeps a refrigerating mode, and the first internal machine can be seen in fig. 4. For example, in fig. 4, the first internal unit is set as the second internal unit heat exchanger 6, and the second internal unit is set as the first internal unit heat exchanger 5, and after the second internal unit heat exchanger 6 is started by cooling, the first branch expansion valve 81 and the fifth electromagnetic valve 75 are selectively opened, so that the first internal unit heat exchanger 5 can be started by heating. The outer machine heat exchanger 3 and the first inner machine heat exchanger 5 are connected in parallel and then connected in series with the second inner machine heat exchanger 6 in the circulating flow direction of the refrigerant; at this time, the high-temperature and high-pressure gaseous refrigerant is condensed and released at the first inner machine heat exchanger 5, and then is converged with the heat exchange refrigerant flowing through the outer machine heat exchanger 3, and then still continuously flows through the second inner machine heat exchanger 6 to evaporate and absorb heat, namely, when the corresponding second inner machine is started up by heating, the first inner machine still keeps refrigeration running.
Similarly, when the system is started and the operation mode of the first inner machine is set to be heating, the reversing circuit of the four-way valve 2 will be shown in fig. 5 after the four-way valve is powered on, and the reversing circuit is marked as a heating circuit, and at this time, the outer machine heat exchanger 3 will operate as an evaporator of the first inner machine. Then, the second internal machine starts to refrigerate, the four-way valve 2 does not need to be changed at all, and only needs to be adjusted by adapting the corresponding electromagnetic valve to the branch expansion valve, and the second internal machine also operates as an evaporator of the first internal machine, so that the second internal machine can be put into operation in a refrigeration mode, and the first internal machine still keeps a heating mode, and the heating mode can be seen in fig. 6. For example, in fig. 6, when the first internal unit is set as the first internal unit heat exchanger 5 and the second internal unit is set as the second internal unit heat exchanger 6, after the first internal unit heat exchanger 5 is started by heating, only the fourth electromagnetic valve 74 is selectively closed and the fifth electromagnetic valve 75 and the seventh electromagnetic valve 77 are opened, so that the second internal unit heat exchanger 6 can be started by cooling. The first inner machine heat exchanger 5 and the second inner machine heat exchanger 6 are connected in series firstly and then connected in series with the outer machine heat exchanger 3 corresponding to the circulating flow direction of the refrigerant; at this time, the high-temperature and high-pressure gaseous refrigerant will continue to condense and release heat at the first inner machine heat exchanger 5, then continue to flow through the second inner machine heat exchanger 6 to evaporate and absorb heat, and finally flow through the outer machine heat exchanger 3 to evaporate and absorb heat further, i.e. when the corresponding second inner machine is started, the first inner machine will still keep heating operation.
Therefore, by the multi-split air conditioning system, after the multi-split air conditioning system is started, the parallel operation of a refrigeration mode and a heating mode can be supported among different internal machines on the premise of no shutdown and restarting. Taking a one-to-two multi-split air conditioning system as an example, when a first internal unit refers to any one of the first internal unit heat exchanger 5 and the second internal unit heat exchanger 6, the second internal unit refers to the other one of the first internal unit heat exchanger 5 and the second internal unit heat exchanger 6. Of course, those skilled in the art will understand that the multiple internal machine system may be provided with a greater number of internal machine heat exchangers, and not limited to two internal machine heat exchangers, and may be specifically and adaptively set according to needs, which is not described herein in detail.
Preferably, the multi-split air conditioning system is of a one-split multi-split type.
Specifically, the multi-split air conditioning system is particularly suitable for one-split multi-split air conditioning system, namely when only one external machine heat exchanger 3 exists, the cooling and heating among the multi-internal machines can still keep parallel operation without stopping, so that the application range of the multi-split air conditioning system is greatly expanded, and the configuration cost of the multi-split air conditioning system is saved.
Of course, the external heat exchanger 3 is provided with an external expansion valve 93 at the rear end of the refrigerating outlet, and it will be understood by those skilled in the art that the first branch pipe 41 is located at the rear end of the external expansion valve 93 to be in one-to-one communication with the first refrigerating inlet 51, the first refrigerating main outlet 52, the second refrigerating inlet 61 and the second refrigerating main outlet 62.
As one preferable implementation mode of the invention, the multi-split air conditioning system is a one-to-two air pipe machine.
Specifically, when the multi-split air conditioning system is one-split-two, the multi-split internal machine system only needs to include the first internal machine heat exchanger 5 and the second internal machine heat exchanger 6. Of course, for any of the heat exchangers, an internal expansion valve is disposed at the front end of the refrigerating inlet, the internal expansion valve of the first heat exchanger 5 is denoted as a first internal expansion valve 91, the internal expansion valve of the second heat exchanger 6 is denoted as a second internal expansion valve 92, and it will be understood by those skilled in the art that the fifth electromagnetic valve 75 is disposed on the first manifold 41, one end thereof is connected between the fourth electromagnetic valve 74 and the first internal expansion valve 91, and the other end thereof is connected between the third electromagnetic valve 73 and the second internal expansion valve 92.
Preferably, there is only one each of the compressor 1 and the four-way valve 2.
Specifically, in the multi-split air conditioning system, even when only one compressor 1 and one four-way valve 2 are arranged, the multi-split air conditioning system can still run in parallel without stopping the machine even though the refrigerating and heating among the multi-split air conditioning systems are operated, so that the application range of the multi-split air conditioning system is greatly expanded, and the configuration cost of the multi-split air conditioning system is saved.
Preferably, on the first internal machine heat exchanger 5, the first auxiliary cooling outlet 53 is formed adjacent to one end of the first main cooling outlet 52, and is separated from the first main cooling outlet 52 by at least one heat exchanger U-shaped copper tube or a row of heat exchange flow paths;
and/or on the second internal machine heat exchanger 6, the second auxiliary cooling outlet 63 is formed adjacent to one end of the second main cooling outlet 62, and at least one heat exchanger U-shaped copper tube or one heat exchange flow path is separated from the second main cooling outlet 62.
Specifically, in the prior art, both the first internal heat exchanger 5 and the second internal heat exchanger 6 generally have a refrigerant inlet and a refrigerant outlet, and taking the first internal heat exchanger 5 as an example, one end of the first internal heat exchanger is provided with a first refrigeration inlet 51, and the other end is provided with only a first refrigeration main outlet 52. In the present invention, the first auxiliary cooling outlet 53 is formed adjacent to one end of the first main cooling outlet 52, so that the first inner machine heat exchanger 5 will have two refrigerant outlets to adaptively adjust the usage state of the first inner machine heat exchanger 5.
When the first internal heat exchanger 5 is of a single-row flow path structure, the first auxiliary cooling outlet 53 may be formed at the front end of the first main cooling outlet 52, so as to be at least separated from the first main cooling outlet 52 by a U-shaped copper tube of the heat exchanger; when the first heat exchanger 5 has a multi-row structure, the first auxiliary cooling outlet 53 may be at least one row of heat exchange channels from the first main cooling outlet 52. That is, the specific opening position of the first auxiliary cooling outlet 53 may be set in an optimized manner according to actual needs, and the present invention is not particularly limited herein. Similarly, the specific opening position of the second auxiliary cooling outlet 63 is also the same, and the present invention will not be described herein again.
Preferably, the first sub-manifold 41 is at least a sub-manifold and is connected with a fourth sub-manifold 44 at the rear end of the branch pipe provided with the fourth solenoid valve 74, and is connected with a fifth sub-manifold 45 at the rear end of the branch pipe provided with the third solenoid valve 73, and the fourth sub-manifold 44 and the fifth sub-manifold 45 share a section of branch pipe for the fifth solenoid valve 75 to be mounted thereon.
Specifically, when the multi-split air conditioning system is a split-split air conditioning system, the first sub-manifold 41 may be a split-four sub-manifold, but the fourth sub-manifold 44 and the fifth sub-manifold 45 are needed to be connected, so as to facilitate the installation of the fifth electromagnetic valve 75. In this case, the second sub-manifold 42, the third sub-manifold 43, the fourth sub-manifold 44 and the fifth sub-manifold 45 may be a one-sub-manifold, as shown in fig. 2. When the multi-split air conditioning system is more complex, the second sub-manifold 42, the third sub-manifold 43, and the first sub-manifold 41 connected with the fourth sub-manifold 44 and the fifth sub-manifold 45 can be adaptively selected according to actual needs.
Example 2
Referring to fig. 3-6, the present invention further provides a control method of a multi-split air conditioning system, using the multi-split air conditioning system as described in embodiment 1, when the multi-split air conditioning system is one-split-two-split-full-open refrigeration, the method includes the following steps:
s1: closing the first branch expansion valve 81, the second branch expansion valve 82, the fifth solenoid valve 75, the sixth solenoid valve 76, the seventh solenoid valve 77;
s2: opening the first, second, third, and fourth solenoid valves 71, 72, 73, 74;
s3: full-open refrigeration starts, wherein the four-way valve 2 is powered on and is put into use according to a refrigeration circuit.
Specifically, in the prior art, the four-way valve 2 generally has two reversing circuits, one of which is used to start the refrigeration mode of the multi-split air conditioning system, namely, the refrigeration circuit, as shown in fig. 3; another heating mode, i.e., a heating loop, for starting the multi-split air conditioning system is shown in fig. 5. When the refrigerating circuit and the heating circuit are switched, the four-way valve 2 needs to be powered down, commutated and restarted.
Referring to fig. 3, during full-open refrigeration, the four-way valve 2 is powered on and is put into operation according to the refrigeration circuit, and under the action of steps S1-S2, the flow direction of the refrigerant is shown by the flow path (marked with bold lines to show distinction) and the arrow in fig. 3. In this scenario, the external heat exchanger 3 is used as a condenser, and the first internal heat exchanger 5 and the second internal heat exchanger 6 are both used as evaporators, so that both internal heat exchangers can be put into operation according to a refrigeration mode, that is, full-open refrigeration is realized.
Preferably, after step S3, when the first indoor unit heat exchanger 5 is changed to a heating operation, the method further includes the steps of:
s4: closing the first electromagnetic valve 71, the fourth electromagnetic valve 74;
s5: the first branch expansion valve 81 and the fifth solenoid valve 75 are opened.
Specifically, referring to fig. 4, when the first indoor unit heat exchanger 5 is changed to the heating operation in the full cooling operation, the four-way valve 2 does not need to make any change and still keeps the refrigeration circuit in operation (i.e. no power-down reversing and restarting is needed), and then the flowing direction of the refrigerant is shown by the flow-through pipe route (marked with bold lines to show distinction) and the arrow in fig. 4 under the action of steps S4-S5. In this scenario, the second internal heat exchanger 6 still serves as an evaporator, and the first internal heat exchanger 5 will cooperate with the external heat exchanger 3 to serve as a condenser. Therefore, the heating mode of the first internal machine heat exchanger 5 and the refrigerating mode of the second internal machine heat exchanger 6 can be kept to run in parallel without stopping, so that the heat recovery of the multi-split air conditioning system can be greatly improved while the convenience selection of different users is improved, and the working efficiency of the multi-split air conditioning system is improved.
Similarly, under the condition of full open refrigeration, the first internal machine heat exchanger 5 can keep a refrigeration mode, and the second internal machine heat exchanger 6 is selected to be changed into heating operation, the logic is communicated, and only the corresponding electromagnetic valve and the branch pipe expansion valve are required to be adaptively adjusted, so that those skilled in the art can expect on the basis of the above disclosure, and excessive expansion details are not needed.
Preferably, after step S3, when the multi-split air conditioning system is fully on for heating, the method further includes the following steps:
s6: the four-way valve 2 is powered down and commutated;
s7: opening the first branch expansion valve 81 and the second branch expansion valve 82;
s8: the full-open heating starts, wherein the four-way valve 2 is powered on again and put into use according to the heating loop.
Specifically, referring to fig. 5, when the multi-split air conditioning system is fully opened for cooling, the four-way valve 2 needs to be turned off, turned on again, and then the switching state of the reversing circuit is switched, specifically, the cooling circuit is switched to the heating circuit. Further, under the action of steps S6-S8, the flow direction of the refrigerant is shown by the flow path (indicated by the bold line to show the distinction) and the arrow in fig. 5. In this scenario, the external heat exchanger 3 is used as an evaporator, and the first internal heat exchanger 5 and the second internal heat exchanger 6 are both used as condensers, so that both internal heat exchangers can be put into operation according to a heating mode, that is, the heating is fully opened.
Meanwhile, as can be understood by those skilled in the art, referring to the prior art, step S7 may be default, which does not affect the smooth transition of the multi-split air conditioning system to full-split heating in the fully-split cooling scenario. Of course, the setting in step S7 is beneficial to improving the heating performance of the multi-split air conditioning system.
Preferably, after step S8, when the second indoor unit heat exchanger 6 is changed to a cooling operation, the method further includes the steps of:
s9: closing the second branch expansion valve 82, the second solenoid valve 72, the third solenoid valve 73, the fourth solenoid valve 74;
s10: the fifth solenoid valve 75 and the seventh solenoid valve 77 are opened.
Specifically, referring to fig. 6, when the second indoor unit heat exchanger 6 is changed to the cooling operation in the heating full-open state, the four-way valve 2 does not need to be changed and still keeps the heating circuit in use (i.e. no power-down reversing and restarting is needed), and then the flowing direction of the refrigerant is shown by the flow-through pipe route (marked with bold lines to show distinction) and the arrow in fig. 6 under the action of steps S9-S10. In this scenario, the first internal heat exchanger 5 still serves as a condenser, and the second internal heat exchanger 6 will cooperate with the external heat exchanger 3 to serve as an evaporator. Therefore, the refrigerating mode of the second internal machine heat exchanger 6 and the heating mode of the first internal machine heat exchanger 5 can be kept to run in parallel without stopping, so that the heat recovery of the multi-split air conditioning system can be greatly improved while the convenience selections of different users are improved, and the working efficiency of the multi-split air conditioning system is improved.
Similarly, under the condition that the heating is fully opened, the second internal machine heat exchanger 6 can keep a heating mode, the first internal machine heat exchanger 5 is selected to be changed into a cooling operation, the logics of the first internal machine heat exchanger are communicated, and the corresponding electromagnetic valve and the branch pipe expansion valve are only required to be adaptively adjusted, so that a person skilled in the art can expect on the basis of the above disclosure, and excessive expansion details are not needed.
Finally, it will be understood by those skilled in the art that the full-open refrigeration corresponding to the steps S1-S3 is taken as an initial starting condition herein, which is only an exemplary description selected for convenience of description, so that the multi-split air conditioning system can make various real-time adjustments to any one of the running states of different internal machines according to actual needs, and further the combination control of the related solenoid valves and the branch expansion valves can also generate adaptive changes.
Furthermore, the present invention also provides a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the method as described in this embodiment 2.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (10)
1. The multi-split air conditioning system is characterized by comprising a compressor (1), a four-way valve (2), an external machine heat exchanger (3) and a multi-split internal machine system, wherein the multi-split internal machine system at least comprises a first internal machine heat exchanger (5) and a second internal machine heat exchanger (6), the first internal machine heat exchanger (5) comprises a first refrigeration inlet (51) and a first refrigeration main outlet (52) and a first refrigeration auxiliary outlet (53), and the second internal machine heat exchanger (6) comprises a second refrigeration inlet (61) and a second refrigeration main outlet (62) and a second refrigeration auxiliary outlet (63);
the external heat exchanger (3) is communicated with the first refrigeration inlet (51), the first refrigeration main outlet (52), the second refrigeration inlet (61) and the second refrigeration main outlet (62) one by one through a first branch pipe (41), and a fourth electromagnetic valve (74), a sixth electromagnetic valve (76), a third electromagnetic valve (73) and a seventh electromagnetic valve (77) are correspondingly arranged between the external heat exchanger and the first refrigeration inlet; a fifth electromagnetic valve (75) is further arranged on the first branch pipe (41), one end of the fifth electromagnetic valve (75) is connected between the fourth electromagnetic valve (74) and the first refrigerating inlet (51), and the other end of the fifth electromagnetic valve is connected between the third electromagnetic valve (73) and the second refrigerating inlet (61);
the compressor (1) is additionally provided with a bypass exhaust pipe (11) at the exhaust end, the bypass exhaust pipe (11) is directly communicated with the first main refrigerating outlet (52) and the second main refrigerating outlet (62) one by one through a third branch pipe (43), a first branch pipe expansion valve (81) is arranged on a branch pipe of the third branch pipe (43) corresponding to the first main refrigerating outlet (52), and a second branch pipe expansion valve (82) is arranged on a branch pipe of the second main refrigerating outlet (62);
the first refrigeration auxiliary outlets (53) and the second refrigeration auxiliary outlets (63) are communicated with the four-way valves (2) one by one through second branch pipes (42), the branch pipes of the second branch pipes (42) corresponding to the first refrigeration auxiliary outlets (53) are provided with first electromagnetic valves (71), and the branch pipes of the second refrigeration auxiliary outlets (63) are provided with second electromagnetic valves (72).
2. The multi-split air conditioning system of claim 1, wherein the multi-split air conditioning system is of a one-split type.
3. A multi-split air conditioning system according to claim 2, wherein the compressor (1) and the four-way valve (2) are each only one.
4. A multi-split air conditioning system according to any of claims 1-3, characterized in that on the first indoor unit heat exchanger (5), the first auxiliary cooling outlet (53) is opened adjacent to one end of the first main cooling outlet (52), and at least one heat exchanger's U-shaped copper tube or a row of heat exchange flow paths are separated from the first main cooling outlet (52);
and/or on the second internal machine heat exchanger (6), the second auxiliary refrigerating outlet (63) is arranged adjacent to one end of the second main refrigerating outlet (62), and at least one U-shaped copper pipe or one row of heat exchange flow path of the heat exchanger is arranged between the second auxiliary refrigerating outlet and the second main refrigerating outlet (62).
5. A multi-split air conditioning system according to any of claims 1-3, characterized in that the first sub-manifold (41) is at least a sub-manifold and is terminated with a fourth sub-manifold (44) at the rear of the branch pipe where the fourth solenoid valve (74) is installed, and a fifth sub-manifold (45) is terminated at the rear of the branch pipe where the third solenoid valve (73) is installed, the fourth sub-manifold (44) and the fifth sub-manifold (45) sharing a section of branch pipe for the fifth solenoid valve (75) to be installed thereon.
6. A control method of a multi-split air conditioning system, wherein the multi-split air conditioning system according to any one of claims 1 to 5 is used, and when the multi-split air conditioning system is one-split-two-split-full-on refrigeration, the method comprises the following steps:
s1: closing the first branch pipe expansion valve (81), the second branch pipe expansion valve (82), the fifth electromagnetic valve (75), the sixth electromagnetic valve (76) and the seventh electromagnetic valve (77);
s2: opening a first electromagnetic valve (71), a second electromagnetic valve (72), a third electromagnetic valve (73) and a fourth electromagnetic valve (74);
s3: the full-open refrigeration starts, wherein the four-way valve (2) is electrified and is used according to a refrigeration loop.
7. The control method of a multi-split air conditioning system according to claim 6, wherein after step S3, when the first indoor unit heat exchanger (5) is changed to a heating operation, the method further comprises the steps of:
s4: closing the first electromagnetic valve (71) and the fourth electromagnetic valve (74);
s5: the first branch pipe expansion valve (81) and the fifth electromagnetic valve (75) are opened.
8. The method for controlling a multi-split air conditioning system according to claim 6, wherein after step S3, when the multi-split air conditioning system is fully on for heating, the method further comprises the steps of:
s6: the four-way valve (2) is powered down and commutated;
s7: opening a first branch pipe expansion valve (81) and a second branch pipe expansion valve (82);
s8: the full-open heating is started, wherein the four-way valve (2) is electrified again and is put into use according to a heating loop.
9. The control method of a multi-split air conditioning system according to claim 8, wherein after step S8, when the second indoor unit heat exchanger (6) is changed to a cooling operation, the method further comprises the steps of:
s9: closing the second branch expansion valve (82), the second electromagnetic valve (72), the third electromagnetic valve (73) and the fourth electromagnetic valve (74);
s10: the fifth electromagnetic valve (75) and the seventh electromagnetic valve (77) are opened.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when read and run by a processor, implements the method according to any of claims 6-9.
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