CN115235139B - Three-pipe multi-split air conditioning system, control method and storage medium - Google Patents

Three-pipe multi-split air conditioning system, control method and storage medium Download PDF

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Publication number
CN115235139B
CN115235139B CN202210717580.0A CN202210717580A CN115235139B CN 115235139 B CN115235139 B CN 115235139B CN 202210717580 A CN202210717580 A CN 202210717580A CN 115235139 B CN115235139 B CN 115235139B
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pipe
outlet
refrigeration
air conditioning
conditioning system
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CN115235139A (en
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陈体宁
刘合心
郝明
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • 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
    • 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 three-pipe multi-split air conditioning system, a control method and a storage medium, wherein the system comprises the following components: 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; one end of the first connecting tube is connected to the rear end of the first electromagnetic valve, and the other end of the first connecting tube is connected between the first main refrigerating outlet and the first branch expansion valve; one end of the second connecting tube is connected with the rear end of the second electromagnetic valve, and the other end of the second connecting tube is connected between the second main refrigerating outlet and the second branch expansion valve. According to the three-pipe multi-split air conditioning system, the control method and the storage medium, when the multi-split air conditioning system enters any one of the three modes of dehumidification, defrosting and oil return, the indoor temperature is not reduced, so that the use comfort of the multi-split air conditioning system is improved.

Description

Three-pipe multi-split air conditioning system, control method and storage medium
Technical Field
The invention relates to the technical field of air conditioning, in particular to a three-pipe multi-split air conditioning system, a control method and a storage medium.
Background
The multi-split air conditioning systems on the market at present are generally shown in fig. 1, and the following problems can be encountered during operation:
1) When the air conditioning system is started in the dehumidification mode, the air conditioning system actually runs in the refrigerant flowing direction of the refrigeration mode, but only reduces the air quantity, so that the indoor temperature is inevitably reduced along with the reduction of the humidity, and the comfort is reduced;
2) When the air conditioning system heats and runs for a long time, frosting of the external machine and uneven oil return of the compressor running for a long time can occur, so the system can restart to start a corresponding defrosting mode or oil return mode, but in practice, the system runs in the cooling mode according to the refrigerant flowing direction in the two modes, and although the internal machine reduces the air quantity or stops the fan running, the indoor temperature is inevitably reduced, and the comfort is reduced.
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 three-pipe multi-split air conditioning system, so that when the multi-split air conditioning system enters any one of three modes of dehumidification, defrosting and oil return, the indoor temperature is not reduced, and the use comfort of the multi-split air conditioning system is improved.
In order to solve the technical problem of the first aspect, the invention provides a three-pipe multi-split air conditioning system, which comprises a compressor, a four-way valve, an external machine heat exchanger and a multi-split internal machine system, wherein the multi-split internal machine system at least comprises a first internal machine heat exchanger and a second internal machine heat exchanger, the first internal machine heat exchanger comprises a first refrigeration inlet, a first refrigeration main outlet and a first refrigeration auxiliary outlet, the second internal machine heat exchanger comprises a second refrigeration inlet, a second refrigeration main outlet and a second refrigeration auxiliary outlet, and the external machine heat exchanger is communicated with the first refrigeration inlet and the second refrigeration inlet one by one through a first branch pipe;
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 valve one by one through second branch pipes, first electromagnetic valves are arranged on branch pipes corresponding to the first refrigeration auxiliary outlets, and second electromagnetic valves are arranged on branch pipes corresponding to the second refrigeration auxiliary outlets;
the first connecting pipe and the second connecting pipe are uniformly connected between the second branch pipe and the third branch pipe, a third electromagnetic valve is arranged on the first connecting pipe, and a fourth electromagnetic valve is arranged on the second connecting pipe; one end of the first connecting tube is connected to the rear end of the first electromagnetic valve, and the other end of the first connecting tube is connected between the first main refrigerating outlet and the first branch pipe expansion valve; one end of the second connecting tube is connected with the rear end of the second electromagnetic valve, and the other end of the second connecting tube is connected between the second main refrigerating outlet and the second branch pipe expansion valve.
According to the three-pipe multi-split air conditioning system, when the multi-split air conditioning system enters any one of the three modes of dehumidification, defrosting and oil return, the indoor temperature is not reduced, so that the use comfort of the multi-split air conditioning system is improved.
Preferably, the three-pipe multi-split air conditioning system is of a one-to-multiple type.
The three-pipe 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, any internal machine heat exchanger can be adjusted and switched at any time according to the requirements on three states of normal refrigeration, normal heating, parallel refrigeration and heating, so that the application range of the three-pipe multi-split air conditioning system is greatly expanded, and the configuration cost of the three-pipe multi-split air conditioning system is saved.
Preferably, there is only one each of the compressor and the four-way valve.
According to the three-pipe multi-split air conditioning system, even when only one compressor and one four-way valve are arranged, for any one internal machine heat exchanger, the three states of normal refrigeration, normal heating, parallel refrigeration and heating can be adjusted and switched at any time according to the needs, so that the application range of the three-pipe multi-split air conditioning system is greatly expanded, and the configuration cost of the three-pipe 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 internal 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 internal machine heat exchanger is provided with two refrigerant outlets, and the first internal machine heat exchanger can be started to be in a third state of parallel refrigeration and heating when necessary; 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 auxiliary refrigerating outlet is arranged on an outer exhaust flow path structure of the first inner machine heat exchanger opposite to the air outlet position of the inner machine, and/or the second auxiliary refrigerating outlet is arranged on an outer exhaust flow path structure of the second inner machine heat exchanger opposite to the air outlet position of the inner machine.
The first refrigeration auxiliary outlet and/or the second refrigeration auxiliary outlet are/is corresponding to the air outlet position of the inner machine, so that the best neutralization effect can be achieved by using the least heat exchange area.
Preferably, the number of internal units of the multi-connected internal unit system is N, and the second branch pipe and the third branch pipe are at least one branch pipe N branch pipe, wherein N is greater than or equal to 2.
When the three-pipe multi-split air conditioning system is one-to-two, the second branch pipe and the third branch pipe can be only one branch pipe; when the three-pipe multi-split air conditioning system is more complicated, the number of N is more than or equal to 2, the second branch pipe and the third branch pipe can be adaptively selected according to actual needs, for example, at least one N branch pipe is adopted.
The technical problems to be solved by the invention are as follows: the second aspect provides a control method of a three-pipe multi-split air conditioning system, and/or the third aspect provides a computer readable storage medium, so that when the multi-split air conditioning system enters any one of three modes of dehumidification, defrosting and oil return, the indoor temperature is not reduced, and the use comfort of the multi-split air conditioning system is improved.
In order to solve the technical problem of the second aspect, the present invention provides a control method of a three-pipe multi-split air conditioning system, using the three-pipe multi-split air conditioning system according to any embodiment of the first aspect, and when the three-pipe multi-split air conditioning system is one-split-two and full-open refrigeration, the method comprises the following steps:
s1: closing the first branch pipe expansion valve, the second branch pipe expansion valve, the first electromagnetic valve and the second electromagnetic valve;
s2: opening 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 three-pipe multi-split air conditioning system is fully on for heating, the method further includes the following steps:
s4: the four-way valve is powered down and commutated;
s5: 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 three-pipe multi-split air conditioning system is fully opened for refrigeration, 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 refrigeration loop into the heating loop. And under the action of the steps S4-S5, 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.
Preferably, after step S5, when the three-pipe multi-split air conditioning system is changed to any one of dehumidification, defrosting and oil return modes, the method further includes the following steps:
s6: the four-way valve is powered down again for reversing;
s7: closing the third electromagnetic valve and the fourth electromagnetic valve;
s8: opening the first branch pipe expansion valve, the second branch pipe expansion valve, the first electromagnetic valve and the second electromagnetic valve;
s9: the corresponding dehumidifying, defrosting and oil returning modes are alternatively started, wherein the four-way valve is electrified again and is put into use according to the refrigerating circuit.
When the multi-split air conditioning system is switched to any one of dehumidification, defrosting and oil return modes under the condition of full heating, the four-way valve is required to be powered down, commutated and restarted to switch the on state of the commutated loop, in particular to switch the heating loop to a refrigerating loop. And under the action of the steps S7-S8, the heat exchanger of the outer machine is used as a condenser, and any one of the heat exchanger of the first inner machine and the heat exchanger of the second machine can be started to be in a third state of parallel refrigeration and heating, so that the air outlet temperature of the indoor machine can be neutralized, the purpose that the air outlet temperature is equal to or even higher than the air inlet (return) temperature is achieved, and the use comfort 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 three-pipe multi-split air conditioning system, the control method and the storage medium have the following beneficial effects:
when the multi-split air conditioning system enters any one of the three modes of dehumidification, defrosting and oil return, the indoor temperature cannot be reduced, so that the use comfort 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 three-pipe 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 three-pipe multi-split air conditioning system illustrated in FIG. 2 under full-open refrigeration;
FIG. 4 is a schematic diagram illustrating a refrigerant flow direction of the three-pipe multi-split air conditioning system in the fully-open heating mode shown in FIG. 3;
fig. 5 is a schematic diagram illustrating a refrigerant flow direction of the three-pipe multi-split air conditioning system in the dehumidification, defrosting and oil return modes described in fig. 4.
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-first connecting pipe, 45-second connecting 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, 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. 2-5, the invention provides a three-pipe 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, 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, and the external heat exchanger 3 is communicated with the first refrigeration inlet 51 and the second refrigeration inlet 61 one by one through a first branch pipe 41;
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 valve 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 corresponding to the second auxiliary refrigerating outlet 63;
the first connecting pipe 44 and the second connecting pipe 45 are uniformly connected between the second branch pipe 42 and the third branch pipe 43, the first connecting pipe 44 is provided with a third electromagnetic valve 73, and the second connecting pipe 45 is provided with a fourth electromagnetic valve 74; wherein, one end of the first connecting tube 44 is connected to the rear end of the first electromagnetic valve 71, and the other end is connected between the first main cooling outlet 52 and the first branch expansion valve 81; the second connecting pipe 45 has one end connected to the rear end of the second electromagnetic valve 72 and the other end connected between the second main cooling outlet 62 and the second branch expansion valve 82.
Specifically, on the basis of well-known connection according to the prior art, the compressor 1, the four-way valve 2, the external heat exchanger 3 and the multi-connected internal machine system are further set through the multiple aspects, so that the multi-connected air conditioning system forms the three-pipe multi-connected air conditioning system, and further, when entering any one of the three modes of dehumidification, defrosting and oil return, the indoor temperature is not reduced, and the use comfort of the multi-connected air conditioning system is improved. More specifically:
under different scenes, by adopting the adaptive combination control on the four electromagnetic valves and the two branch pipe expansion valves, the dehumidification, defrosting and oil return modes can be specifically aimed at on the premise of meeting the normal refrigeration and normal heating of the multi-connected air conditioning system, so that the high-temperature and high-pressure gaseous refrigerant can be subjected to normal dehumidification, defrosting and oil return on a part of flow paths on the same heat exchanger of the internal machine, and can be transmitted to another part of flow paths through the bypass exhaust pipe 11 and the third branch pipe 43 for simultaneous heating, and the method can be seen in fig. 5. For example, in fig. 5, taking the first internal heat exchanger 5 as an example, by closing the third electromagnetic valve 73 and opening the first branch expansion valve 81, the flow path structure of the first internal heat exchanger 5 is divided into front and rear parts by taking the first auxiliary cooling outlet 53 as a boundary, the first part is between the first cooling medium inlet 51 and the first auxiliary cooling outlet 53, the high-temperature and high-pressure gaseous cooling medium sequentially enters the external heat exchanger 3 along the cooling loop of the four-way valve 2 to condense and release heat, and then enters the first part flow path structure to evaporate and absorb heat, namely, the existing dehumidification, defrosting and oil return modes are maintained. The second part is between the second main refrigerant outlet 52 and the first auxiliary refrigerant outlet 53, and the high-temperature and high-pressure gaseous refrigerant is also transferred to the second part flow path structure through the bypass exhaust pipe 11 and the first branch expansion valve 81, so as to participate in the heat dissipation of condensation of the second part flow path structure.
Therefore, according to the three-pipe multi-split air conditioning system, at least one of the first inner machine heat exchanger 5 and the second inner machine heat exchanger 6 can have three states of normal refrigeration, normal heating and parallel refrigeration and heating (particularly on the same inner machine heat exchanger, the lower part is the same), so that in the third state of parallel refrigeration and heating, the air outlet temperature of the indoor machine can be neutralized, and the purpose that the air outlet temperature is equal to or even higher than the air inlet (return) temperature is achieved, thereby improving the use comfort of the multi-split air conditioning system. Taking a one-to-two three-pipe multi-split air conditioning system as an example, the third states of the first inner machine heat exchanger 5 and the second inner machine heat exchanger 6 can be kept synchronous or asynchronous, for example, when the first inner machine heat exchanger 5 is used for refrigerating and heating, the second inner machine heat exchanger 6 can still be in a normal refrigerating mode only. 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 three-pipe multi-split air conditioning system is of a one-to-multiple type.
Specifically, the three-pipe 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, any one internal machine heat exchanger can be subjected to adjustment and switching at any time according to the requirements on three states of normal refrigeration, normal heating, parallel refrigeration and heating, so that the application range of the three-pipe multi-split air conditioning system is greatly expanded, and the configuration cost of the three-pipe 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 refrigeration outlet thereof, and the first branch pipe 41 is located at the rear end of the external expansion valve 93 so as to be in one-to-one communication with both the first refrigeration inlet 51 and the second refrigeration inlet 61.
As one preferable implementation mode of the invention, the three-pipe multi-split air conditioning system is a three-pipe one-to-two air pipe machine.
Specifically, when the three-pipe multi-split air conditioning system is one-to-two, the multi-split indoor unit system only needs to include the first indoor unit heat exchanger 5 and the second indoor unit heat exchanger 6. Of course, for any one of the heat exchangers, an inner expansion valve is disposed at the front end of the refrigerating inlet, the inner expansion valve of the first heat exchanger 5 is denoted as a first inner expansion valve 91, the inner expansion valve of the second heat exchanger 6 is denoted as a second inner expansion valve 92, and one of the branch pipes of the first branch pipe 41 is communicated with the first refrigerating inlet 51 through the first inner expansion valve 91, while the other branch pipe is communicated with the second refrigerating inlet 52 through the second inner expansion valve 92.
Preferably, there is only one each of the compressor 1 and the four-way valve 2.
Specifically, in the three-pipe multi-split air conditioning system, even when only one compressor 1 and one four-way valve 2 are arranged, three states of normal cooling, normal heating, parallel cooling and heating of any one indoor unit heat exchanger can be adjusted and switched at any time according to requirements, so that the application range of the three-pipe multi-split air conditioning system is greatly expanded, and the configuration cost of the three-pipe 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 internal heat exchanger 5 will have two cooling medium outlets, so that the first internal heat exchanger 5 can enable the third state of parallel cooling and heating when necessary.
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 auxiliary cooling outlet 53 is disposed on an outer exhaust flow path structure of the first inner heat exchanger 5 opposite to the air outlet position of the inner heat exchanger, and/or the second auxiliary cooling outlet 63 is disposed on an outer exhaust flow path structure of the second inner heat exchanger 6 opposite to the air outlet position of the inner heat exchanger.
Specifically, the first auxiliary cooling outlet 53 and/or the second auxiliary cooling outlet 63 are opposite to the corresponding air outlet position of the internal machine, so that the best neutralization effect can be achieved by using the least heat exchange area.
Preferably, the number of internal units of the multi-connected internal unit system is N, and the second sub-manifold 42 and the third sub-manifold 43 are at least one sub-N sub-manifold, where N is greater than or equal to 2.
Specifically, when the three-pipe multi-split air conditioning system is one split air conditioning system, the first split manifold 41, the second split manifold 42 and the third split manifold 43 may be only one split manifold, and the number of the splicing sleeves including the first splicing sleeve 44 and the second splicing sleeve 45 may be two or more, at this time, the number of the electromagnetic valves is at least four, and the number of the branch expansion valves is at least two, as can be seen in fig. 2. When the three-pipe multi-split air conditioning system is more complex, namely one split N (N is more than or equal to 2), the first split pipe 41, the second split pipe 42 and the third split pipe 43 can be adaptively selected according to actual needs, for example, at least one split N is adopted; meanwhile, the number of the splicing sleeves, the number of the electromagnetic valves and the number of the branch expansion valves can be adaptively adjusted according to actual needs, for example, the number of the splicing sleeves and the number of the branch expansion valves are selected to be equal to or greater than N, and the number of the electromagnetic valves is selected to be equal to or greater than 2*N.
Example 2
Referring to fig. 3-5, the invention further provides a control method of the three-pipe multi-split air conditioning system, using the three-pipe multi-split air conditioning system as described in embodiment 1, when the three-pipe multi-split air conditioning system is one-split two-split full-open refrigeration, the method comprises the following steps:
s1: closing the first branch expansion valve 81, the second branch expansion valve 82, the first solenoid valve 71, the second solenoid valve 72;
s2: opening the third electromagnetic valve 73 and the fourth electromagnetic valve 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. 4. 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 three-pipe multi-split air conditioning system is fully on for heating, the method further includes the following steps:
s4: the four-way valve 2 is powered down and commutated;
s5: 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. 4, when the three-pipe multi-split air conditioning system needs to be turned into full-open heating in the full-open cooling, the four-way valve 2 needs to be turned off and turned on again to switch the on state of the reversing loop, specifically, switch the cooling loop into the heating loop. Further, under the action of steps S4-S5, 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. 4. 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.
Preferably, after step S5, when the three-pipe multi-split air conditioning system is changed to any one of dehumidification, defrosting and oil return modes, the method further includes the following steps:
s6: the four-way valve 2 is powered down again for reversing;
s7: closing the third solenoid valve 73 and the fourth solenoid valve 74;
s8: opening the first branch expansion valve 81, the second branch expansion valve 82, the first solenoid valve 71, the second solenoid valve 72;
s9: the corresponding dehumidifying, defrosting and oil returning modes are alternatively started, wherein the four-way valve 2 is electrified again and is put into use according to a refrigerating circuit.
Specifically, referring to fig. 5, when the multi-split air conditioning system is turned into any one of dehumidification, defrosting and oil return modes in the heating fully-opened state, the four-way valve 2 needs to be powered down, commutated and restarted to switch the on state of the commutated circuit, specifically, switch the heating circuit into the refrigerating circuit. Further, under the action of steps S7-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 case, the external heat exchanger 3 serves as a condenser, and either the first internal heat exchanger 5 or the second heat exchanger 6 may be turned on in a third state in which cooling and heating are parallel. More specifically:
taking the first internal machine heat exchanger 5 as an example, the flow path structure of the first internal machine heat exchanger is divided into a front part and a rear part by taking the first refrigeration auxiliary outlet 53 as a boundary, the first part is arranged between the first refrigerant inlet 51 and the first refrigeration auxiliary outlet 53, and high-temperature and high-pressure gaseous refrigerant sequentially enters the external machine heat exchanger 3 along the refrigeration loop of the four-way valve 2 to condense and release heat, and then enters the first part of the flow path structure to evaporate and absorb heat, namely, the existing dehumidification, defrosting and oil return modes are maintained. The second part is between the second main refrigerant outlet 52 and the first auxiliary refrigerant outlet 53, and the high-temperature and high-pressure gaseous refrigerant is also transferred to the second part flow path structure through the bypass exhaust pipe 11 and the first branch expansion valve 81, so as to participate in the heat dissipation of condensation of the second part flow path structure. Therefore, the first heat exchanger 5 of the first indoor unit can be started in a third state of parallel cooling and heating, and the air outlet temperature of the indoor unit can be neutralized at the first cooling auxiliary outlet 53, so that the purpose that the air outlet temperature is equal to or even higher than the air inlet (return) temperature is achieved, and the use comfort of the multi-split air conditioning system is improved. The second heat exchanger 6 is the same as the first heat exchanger 5, and will not be described in detail herein.
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 utility model provides a three-pipe multi-split air conditioning system which is characterized in that, including compressor (1), cross valve (2), outer machine heat exchanger (3), multi-split inner machine system includes first inner machine heat exchanger (5) and second inner machine heat exchanger (6) at least, first inner machine heat exchanger (5) include first refrigeration entry (51) and first refrigeration main export (52), first refrigeration auxiliary export (53), second inner machine heat exchanger (6) include second refrigeration entry (61) and second refrigeration main export (62), second refrigeration auxiliary export (63), outer machine heat exchanger (3) through first branch pipe (41) with first refrigeration entry (51), second refrigeration entry (61) all one-to-one;
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 valve (2) one by one through a second branch pipe (42), a first electromagnetic valve (71) is arranged on a branch pipe corresponding to the first refrigeration auxiliary outlet (53) of the second branch pipe (42), and a second electromagnetic valve (72) is arranged on a branch pipe corresponding to the second refrigeration auxiliary outlet (63);
the first connecting pipe (44) and the second connecting pipe (45) are uniformly connected between the second branch pipe (42) and the third branch pipe (43), a third electromagnetic valve (73) is arranged on the first connecting pipe (44), and a fourth electromagnetic valve (74) is arranged on the second connecting pipe (45); wherein one end of the first connecting tube (44) is connected with the rear end of the first electromagnetic valve (71), and the other end is connected between the first main refrigerating outlet (52) and the first branch pipe expansion valve (81); one end of the second connecting tube (45) is connected with the rear end of the second electromagnetic valve (72), and the other end is connected between the second main refrigerating outlet (62) and the second branch pipe expansion valve (82).
2. The three-pipe multi-split air conditioning system according to claim 1, wherein the three-pipe multi-split air conditioning system is one-split multi-split.
3. The three-pipe multi-split air conditioning system according to claim 2, wherein each of the compressor (1) and the four-way valve (2) has only one.
4. A three-pipe 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 pipe 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. The three-pipe multi-split air conditioning system according to claim 4, wherein the first refrigeration auxiliary outlet (53) is arranged on an outer exhaust flow path structure of the first inner machine heat exchanger (5) opposite to the inner machine air outlet position, and/or the second refrigeration auxiliary outlet (63) is arranged on an outer exhaust flow path structure of the second inner machine heat exchanger (6) opposite to the inner machine air outlet position.
6. The three-pipe multi-split air conditioning system according to claim 4, wherein the number of internal units of the multi-split internal unit system is N, and the second branch pipe (42) and the third branch pipe (43) are at least one branch pipe N, wherein N is greater than or equal to 2.
7. A control method of a three-pipe multi-split air conditioning system, characterized in that the three-pipe multi-split air conditioning system according to any one of claims 1 to 6 is used, and when the three-pipe multi-split air conditioning system is one-split-two and full-open refrigeration, the method comprises the following steps:
s1: closing the first branch pipe expansion valve (81), the second branch pipe expansion valve (82), the first electromagnetic valve (71) and the second electromagnetic valve (72);
s2: opening 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.
8. The method for controlling a three-pipe multi-split air conditioning system according to claim 7, wherein after step S3, when the three-pipe multi-split air conditioning system is fully on for heating, the method further comprises the steps of:
s4: the four-way valve (2) is powered down and commutated;
s5: 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 three-pipe multi-split air conditioning system according to claim 8, wherein after step S5, when the three-pipe multi-split air conditioning system is changed to any one of dehumidification, defrosting and oil return modes, the method further comprises the steps of:
s6: the four-way valve (2) is powered down again for reversing;
s7: closing the third electromagnetic valve (73) and the fourth electromagnetic valve (74);
s8: opening a first branch pipe expansion valve (81), a second branch pipe expansion valve (82), a first electromagnetic valve (71) and a second electromagnetic valve (72);
s9: the corresponding dehumidifying, defrosting and oil returning modes are alternatively started, wherein the four-way valve (2) is electrified again and is used according to the refrigerating loop.
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 7-9.
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